blob: f4a0587b7d5ec88bddfa04cc4c9a6392604baa88 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * PACKET - implements raw packet sockets.
7 *
Jesper Juhl02c30a82005-05-05 16:16:16 -07008 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
11 *
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090012 * Fixes:
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * Alan Cox : verify_area() now used correctly
14 * Alan Cox : new skbuff lists, look ma no backlogs!
15 * Alan Cox : tidied skbuff lists.
16 * Alan Cox : Now uses generic datagram routines I
17 * added. Also fixed the peek/read crash
18 * from all old Linux datagram code.
19 * Alan Cox : Uses the improved datagram code.
20 * Alan Cox : Added NULL's for socket options.
21 * Alan Cox : Re-commented the code.
22 * Alan Cox : Use new kernel side addressing
23 * Rob Janssen : Correct MTU usage.
24 * Dave Platt : Counter leaks caused by incorrect
25 * interrupt locking and some slightly
26 * dubious gcc output. Can you read
27 * compiler: it said _VOLATILE_
28 * Richard Kooijman : Timestamp fixes.
29 * Alan Cox : New buffers. Use sk->mac.raw.
30 * Alan Cox : sendmsg/recvmsg support.
31 * Alan Cox : Protocol setting support
32 * Alexey Kuznetsov : Untied from IPv4 stack.
33 * Cyrus Durgin : Fixed kerneld for kmod.
34 * Michal Ostrowski : Module initialization cleanup.
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090035 * Ulises Alonso : Frame number limit removal and
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 * packet_set_ring memory leak.
Eric W. Biederman0fb375f2005-09-21 00:11:37 -070037 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090040 * byte arrays at the end of sockaddr_ll
Eric W. Biederman0fb375f2005-09-21 00:11:37 -070041 * and packet_mreq.
Johann Baudy69e3c752009-05-18 22:11:22 -070042 * Johann Baudy : Added TX RING.
chetan lokef6fb8f102011-08-19 10:18:16 +000043 * Chetan Loke : Implemented TPACKET_V3 block abstraction
44 * layer.
45 * Copyright (C) 2011, <lokec@ccs.neu.edu>
46 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 *
48 * This program is free software; you can redistribute it and/or
49 * modify it under the terms of the GNU General Public License
50 * as published by the Free Software Foundation; either version
51 * 2 of the License, or (at your option) any later version.
52 *
53 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090054
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/mm.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080057#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <linux/fcntl.h>
59#include <linux/socket.h>
60#include <linux/in.h>
61#include <linux/inet.h>
62#include <linux/netdevice.h>
63#include <linux/if_packet.h>
64#include <linux/wireless.h>
Herbert Xuffbc6112007-02-04 23:33:10 -080065#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#include <linux/kmod.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090067#include <linux/slab.h>
Neil Horman0e3125c2010-11-16 10:26:47 -080068#include <linux/vmalloc.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020069#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <net/ip.h>
71#include <net/protocol.h>
72#include <linux/skbuff.h>
73#include <net/sock.h>
74#include <linux/errno.h>
75#include <linux/timer.h>
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080076#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#include <asm/ioctls.h>
78#include <asm/page.h>
Al Viroa1f8e7f72006-10-19 16:08:53 -040079#include <asm/cacheflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070080#include <asm/io.h>
81#include <linux/proc_fs.h>
82#include <linux/seq_file.h>
83#include <linux/poll.h>
84#include <linux/module.h>
85#include <linux/init.h>
Herbert Xu905db442009-01-30 14:12:06 -080086#include <linux/mutex.h>
Eric Dumazet05423b22009-10-26 18:40:35 -070087#include <linux/if_vlan.h>
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -080088#include <linux/virtio_net.h>
Richard Cochraned85b562010-04-07 22:41:28 +000089#include <linux/errqueue.h>
Scott McMillan614f60f2010-06-02 05:53:56 -070090#include <linux/net_tstamp.h>
Daniel Borkmannb0138402014-01-15 16:25:36 +010091#include <linux/percpu.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070092#ifdef CONFIG_INET
93#include <net/inet_common.h>
94#endif
Willem de Bruijn47dceb82015-08-14 22:31:34 -040095#include <linux/bpf.h>
Willem de Bruijn719c44d2016-06-07 12:06:34 -040096#include <net/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Pavel Emelyanov2787b042012-08-13 05:49:39 +000098#include "internal.h"
99
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 Assumptions:
102 - if device has no dev->hard_header routine, it adds and removes ll header
103 inside itself. In this case ll header is invisible outside of device,
104 but higher levels still should reserve dev->hard_header_len.
105 Some devices are enough clever to reallocate skb, when header
106 will not fit to reserved space (tunnel), another ones are silly
107 (PPP).
108 - packet socket receives packets with pulled ll header,
109 so that SOCK_RAW should push it back.
110
111On receive:
112-----------
113
114Incoming, dev->hard_header!=NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700115 mac_header -> ll header
116 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118Outgoing, dev->hard_header!=NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700119 mac_header -> ll header
120 data -> ll header
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122Incoming, dev->hard_header==NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700123 mac_header -> UNKNOWN position. It is very likely, that it points to ll
124 header. PPP makes it, that is wrong, because introduce
YOSHIFUJI Hideakidb0c58f2007-07-19 10:44:35 +0900125 assymetry between rx and tx paths.
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700126 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128Outgoing, dev->hard_header==NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700129 mac_header -> data. ll header is still not built!
130 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
132Resume
133 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
134
135
136On transmit:
137------------
138
139dev->hard_header != NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700140 mac_header -> ll header
141 data -> ll header
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143dev->hard_header == NULL (ll header is added by device, we cannot control it)
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700144 mac_header -> data
145 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147 We should set nh.raw on output to correct posistion,
148 packet classifier depends on it.
149 */
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151/* Private packet socket structures. */
152
Eric W. Biederman0fb375f2005-09-21 00:11:37 -0700153/* identical to struct packet_mreq except it has
154 * a longer address field.
155 */
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000156struct packet_mreq_max {
Eric W. Biederman0fb375f2005-09-21 00:11:37 -0700157 int mr_ifindex;
158 unsigned short mr_type;
159 unsigned short mr_alen;
160 unsigned char mr_address[MAX_ADDR_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161};
David S. Millera2efcfa2007-05-29 13:12:50 -0700162
Daniel Borkmann184f4892013-04-16 01:57:46 +0000163union tpacket_uhdr {
164 struct tpacket_hdr *h1;
165 struct tpacket2_hdr *h2;
166 struct tpacket3_hdr *h3;
167 void *raw;
168};
169
chetan lokef6fb8f102011-08-19 10:18:16 +0000170static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
Johann Baudy69e3c752009-05-18 22:11:22 -0700171 int closing, int tx_ring);
172
chetan lokef6fb8f102011-08-19 10:18:16 +0000173#define V3_ALIGNMENT (8)
174
chetan lokebc59ba32011-08-25 10:43:30 +0000175#define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
chetan lokef6fb8f102011-08-19 10:18:16 +0000176
177#define BLK_PLUS_PRIV(sz_of_priv) \
178 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
179
chetan lokef6fb8f102011-08-19 10:18:16 +0000180#define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
181#define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
182#define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
183#define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
184#define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
185#define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
186#define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
187
Johann Baudy69e3c752009-05-18 22:11:22 -0700188struct packet_sock;
Willem de Bruijn77f65eb2013-03-19 10:18:11 +0000189static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
190 struct packet_type *pt, struct net_device *orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
chetan lokef6fb8f102011-08-19 10:18:16 +0000192static void *packet_previous_frame(struct packet_sock *po,
193 struct packet_ring_buffer *rb,
194 int status);
195static void packet_increment_head(struct packet_ring_buffer *buff);
Rosen, Rami878cd3b2017-05-24 18:34:11 +0300196static int prb_curr_blk_in_use(struct tpacket_block_desc *);
chetan lokebc59ba32011-08-25 10:43:30 +0000197static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
chetan lokef6fb8f102011-08-19 10:18:16 +0000198 struct packet_sock *);
chetan lokebc59ba32011-08-25 10:43:30 +0000199static void prb_retire_current_block(struct tpacket_kbdq_core *,
chetan lokef6fb8f102011-08-19 10:18:16 +0000200 struct packet_sock *, unsigned int status);
chetan lokebc59ba32011-08-25 10:43:30 +0000201static int prb_queue_frozen(struct tpacket_kbdq_core *);
202static void prb_open_block(struct tpacket_kbdq_core *,
203 struct tpacket_block_desc *);
chetan lokef6fb8f102011-08-19 10:18:16 +0000204static void prb_retire_rx_blk_timer_expired(unsigned long);
chetan lokebc59ba32011-08-25 10:43:30 +0000205static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
206static void prb_init_blk_timer(struct packet_sock *,
207 struct tpacket_kbdq_core *,
208 void (*func) (unsigned long));
209static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
210static void prb_clear_rxhash(struct tpacket_kbdq_core *,
211 struct tpacket3_hdr *);
212static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
213 struct tpacket3_hdr *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214static void packet_flush_mclist(struct sock *sk);
Iván Brianoccd4eb42017-07-13 09:46:58 -0700215static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Herbert Xuffbc6112007-02-04 23:33:10 -0800217struct packet_skb_cb {
Herbert Xuffbc6112007-02-04 23:33:10 -0800218 union {
219 struct sockaddr_pkt pkt;
Eyal Birger2472d762015-03-01 14:58:28 +0200220 union {
221 /* Trick: alias skb original length with
222 * ll.sll_family and ll.protocol in order
223 * to save room.
224 */
225 unsigned int origlen;
226 struct sockaddr_ll ll;
227 };
Herbert Xuffbc6112007-02-04 23:33:10 -0800228 } sa;
229};
230
David Woodhoused3869ef2015-09-23 19:45:08 +0100231#define vio_le() virtio_legacy_is_little_endian()
232
Herbert Xuffbc6112007-02-04 23:33:10 -0800233#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
Herbert Xu8dc41942007-02-04 23:31:32 -0800234
chetan lokebc59ba32011-08-25 10:43:30 +0000235#define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
chetan lokef6fb8f102011-08-19 10:18:16 +0000236#define GET_PBLOCK_DESC(x, bid) \
chetan lokebc59ba32011-08-25 10:43:30 +0000237 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
chetan lokef6fb8f102011-08-19 10:18:16 +0000238#define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
chetan lokebc59ba32011-08-25 10:43:30 +0000239 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
chetan lokef6fb8f102011-08-19 10:18:16 +0000240#define GET_NEXT_PRB_BLK_NUM(x) \
241 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
242 ((x)->kactive_blk_num+1) : 0)
243
David S. Millerdc99f602011-07-05 01:45:05 -0700244static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
245static void __fanout_link(struct sock *sk, struct packet_sock *po);
246
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100247static int packet_direct_xmit(struct sk_buff *skb)
248{
249 struct net_device *dev = skb->dev;
Willem de Bruijn104ba782016-10-26 11:23:07 -0400250 struct sk_buff *orig_skb = skb;
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100251 struct netdev_queue *txq;
Daniel Borkmann43279502014-03-27 16:38:30 +0100252 int ret = NETDEV_TX_BUSY;
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100253
254 if (unlikely(!netif_running(dev) ||
Daniel Borkmann43279502014-03-27 16:38:30 +0100255 !netif_carrier_ok(dev)))
256 goto drop;
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100257
Willem de Bruijn104ba782016-10-26 11:23:07 -0400258 skb = validate_xmit_skb_list(skb, dev);
259 if (skb != orig_skb)
Daniel Borkmann43279502014-03-27 16:38:30 +0100260 goto drop;
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100261
Iván Brianoccd4eb42017-07-13 09:46:58 -0700262 packet_pick_tx_queue(dev, skb);
Daniel Borkmann10c51b56232014-08-27 11:11:27 +0200263 txq = skb_get_tx_queue(dev, skb);
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100264
Daniel Borkmann43279502014-03-27 16:38:30 +0100265 local_bh_disable();
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100266
Daniel Borkmann43279502014-03-27 16:38:30 +0100267 HARD_TX_LOCK(dev, txq, smp_processor_id());
David S. Miller10b3ad82014-08-29 21:07:24 -0700268 if (!netif_xmit_frozen_or_drv_stopped(txq))
David S. Millerfa2dbdc2014-08-29 21:55:22 -0700269 ret = netdev_start_xmit(skb, dev, txq, false);
Daniel Borkmann43279502014-03-27 16:38:30 +0100270 HARD_TX_UNLOCK(dev, txq);
271
272 local_bh_enable();
273
274 if (!dev_xmit_complete(ret))
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100275 kfree_skb(skb);
Daniel Borkmann43279502014-03-27 16:38:30 +0100276
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100277 return ret;
Daniel Borkmann43279502014-03-27 16:38:30 +0100278drop:
Daniel Borkmann0f97ede2014-04-02 20:52:56 +0200279 atomic_long_inc(&dev->tx_dropped);
Willem de Bruijn104ba782016-10-26 11:23:07 -0400280 kfree_skb_list(skb);
Daniel Borkmann43279502014-03-27 16:38:30 +0100281 return NET_XMIT_DROP;
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100282}
283
Daniel Borkmann66e56cd2013-12-06 11:36:15 +0100284static struct net_device *packet_cached_dev_get(struct packet_sock *po)
285{
286 struct net_device *dev;
287
288 rcu_read_lock();
289 dev = rcu_dereference(po->cached_dev);
290 if (likely(dev))
291 dev_hold(dev);
292 rcu_read_unlock();
293
294 return dev;
295}
296
297static void packet_cached_dev_assign(struct packet_sock *po,
298 struct net_device *dev)
299{
300 rcu_assign_pointer(po->cached_dev, dev);
301}
302
303static void packet_cached_dev_reset(struct packet_sock *po)
304{
305 RCU_INIT_POINTER(po->cached_dev, NULL);
306}
307
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100308static bool packet_use_direct_xmit(const struct packet_sock *po)
309{
310 return po->xmit == packet_direct_xmit;
311}
312
Daniel Borkmann0fd5d572014-02-16 15:55:22 +0100313static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100314{
Li Zhong1cbac012013-12-12 22:39:55 +0100315 return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
Daniel Borkmannd346a3f2013-12-06 11:36:17 +0100316}
317
Daniel Borkmann0fd5d572014-02-16 15:55:22 +0100318static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
319{
320 const struct net_device_ops *ops = dev->netdev_ops;
321 u16 queue_index;
322
323 if (ops->ndo_select_queue) {
324 queue_index = ops->ndo_select_queue(dev, skb, NULL,
325 __packet_pick_tx_queue);
326 queue_index = netdev_cap_txqueue(dev, queue_index);
327 } else {
328 queue_index = __packet_pick_tx_queue(dev, skb);
329 }
330
331 skb_set_queue_mapping(skb, queue_index);
332}
333
David S. Millerce06b032011-07-04 01:44:29 -0700334/* register_prot_hook must be invoked with the po->bind_lock held,
335 * or from a context in which asynchronous accesses to the packet
336 * socket is not possible (packet_create()).
337 */
338static void register_prot_hook(struct sock *sk)
339{
340 struct packet_sock *po = pkt_sk(sk);
Daniel Borkmanne40526c2013-11-21 16:50:58 +0100341
David S. Millerce06b032011-07-04 01:44:29 -0700342 if (!po->running) {
Daniel Borkmann66e56cd2013-12-06 11:36:15 +0100343 if (po->fanout)
David S. Millerdc99f602011-07-05 01:45:05 -0700344 __fanout_link(sk, po);
Daniel Borkmann66e56cd2013-12-06 11:36:15 +0100345 else
David S. Millerdc99f602011-07-05 01:45:05 -0700346 dev_add_pack(&po->prot_hook);
Daniel Borkmanne40526c2013-11-21 16:50:58 +0100347
David S. Millerce06b032011-07-04 01:44:29 -0700348 sock_hold(sk);
349 po->running = 1;
350 }
351}
352
353/* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
354 * held. If the sync parameter is true, we will temporarily drop
355 * the po->bind_lock and do a synchronize_net to make sure no
356 * asynchronous packet processing paths still refer to the elements
357 * of po->prot_hook. If the sync parameter is false, it is the
358 * callers responsibility to take care of this.
359 */
360static void __unregister_prot_hook(struct sock *sk, bool sync)
361{
362 struct packet_sock *po = pkt_sk(sk);
363
364 po->running = 0;
Daniel Borkmann66e56cd2013-12-06 11:36:15 +0100365
366 if (po->fanout)
David S. Millerdc99f602011-07-05 01:45:05 -0700367 __fanout_unlink(sk, po);
Daniel Borkmann66e56cd2013-12-06 11:36:15 +0100368 else
David S. Millerdc99f602011-07-05 01:45:05 -0700369 __dev_remove_pack(&po->prot_hook);
Daniel Borkmanne40526c2013-11-21 16:50:58 +0100370
David S. Millerce06b032011-07-04 01:44:29 -0700371 __sock_put(sk);
372
373 if (sync) {
374 spin_unlock(&po->bind_lock);
375 synchronize_net();
376 spin_lock(&po->bind_lock);
377 }
378}
379
380static void unregister_prot_hook(struct sock *sk, bool sync)
381{
382 struct packet_sock *po = pkt_sk(sk);
383
384 if (po->running)
385 __unregister_prot_hook(sk, sync);
386}
387
Michael S. Tsirkin6e580402014-11-24 13:32:16 +0200388static inline struct page * __pure pgv_to_page(void *addr)
Changli Gao0af55bb2010-12-01 02:52:20 +0000389{
390 if (is_vmalloc_addr(addr))
391 return vmalloc_to_page(addr);
392 return virt_to_page(addr);
393}
394
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700395static void __packet_set_status(struct packet_sock *po, void *frame, int status)
396{
Daniel Borkmann184f4892013-04-16 01:57:46 +0000397 union tpacket_uhdr h;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700398
399 h.raw = frame;
400 switch (po->tp_version) {
401 case TPACKET_V1:
402 h.h1->tp_status = status;
Changli Gao0af55bb2010-12-01 02:52:20 +0000403 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700404 break;
405 case TPACKET_V2:
406 h.h2->tp_status = status;
Changli Gao0af55bb2010-12-01 02:52:20 +0000407 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700408 break;
chetan lokef6fb8f102011-08-19 10:18:16 +0000409 case TPACKET_V3:
Sowmini Varadhan7f953ab2017-01-03 06:31:47 -0800410 h.h3->tp_status = status;
411 flush_dcache_page(pgv_to_page(&h.h3->tp_status));
412 break;
Johann Baudy69e3c752009-05-18 22:11:22 -0700413 default:
chetan lokef6fb8f102011-08-19 10:18:16 +0000414 WARN(1, "TPACKET version not supported.\n");
Johann Baudy69e3c752009-05-18 22:11:22 -0700415 BUG();
416 }
417
418 smp_wmb();
419}
420
421static int __packet_get_status(struct packet_sock *po, void *frame)
422{
Daniel Borkmann184f4892013-04-16 01:57:46 +0000423 union tpacket_uhdr h;
Johann Baudy69e3c752009-05-18 22:11:22 -0700424
425 smp_rmb();
426
427 h.raw = frame;
428 switch (po->tp_version) {
429 case TPACKET_V1:
Changli Gao0af55bb2010-12-01 02:52:20 +0000430 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
Johann Baudy69e3c752009-05-18 22:11:22 -0700431 return h.h1->tp_status;
432 case TPACKET_V2:
Changli Gao0af55bb2010-12-01 02:52:20 +0000433 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
Johann Baudy69e3c752009-05-18 22:11:22 -0700434 return h.h2->tp_status;
chetan lokef6fb8f102011-08-19 10:18:16 +0000435 case TPACKET_V3:
Sowmini Varadhan7f953ab2017-01-03 06:31:47 -0800436 flush_dcache_page(pgv_to_page(&h.h3->tp_status));
437 return h.h3->tp_status;
Johann Baudy69e3c752009-05-18 22:11:22 -0700438 default:
chetan lokef6fb8f102011-08-19 10:18:16 +0000439 WARN(1, "TPACKET version not supported.\n");
Johann Baudy69e3c752009-05-18 22:11:22 -0700440 BUG();
441 return 0;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700442 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443}
Johann Baudy69e3c752009-05-18 22:11:22 -0700444
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +0000445static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
446 unsigned int flags)
Daniel Borkmann7a513842013-04-23 00:39:29 +0000447{
448 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
449
Willem de Bruijn68a360e2014-07-25 18:01:31 -0400450 if (shhwtstamps &&
451 (flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
452 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
453 return TP_STATUS_TS_RAW_HARDWARE;
Daniel Borkmann7a513842013-04-23 00:39:29 +0000454
455 if (ktime_to_timespec_cond(skb->tstamp, ts))
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +0000456 return TP_STATUS_TS_SOFTWARE;
Daniel Borkmann7a513842013-04-23 00:39:29 +0000457
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +0000458 return 0;
Daniel Borkmann7a513842013-04-23 00:39:29 +0000459}
460
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +0000461static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
462 struct sk_buff *skb)
Willem de Bruijn2e313962013-04-23 00:39:28 +0000463{
464 union tpacket_uhdr h;
465 struct timespec ts;
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +0000466 __u32 ts_status;
Willem de Bruijn2e313962013-04-23 00:39:28 +0000467
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +0000468 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
469 return 0;
Willem de Bruijn2e313962013-04-23 00:39:28 +0000470
471 h.raw = frame;
472 switch (po->tp_version) {
473 case TPACKET_V1:
474 h.h1->tp_sec = ts.tv_sec;
475 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
476 break;
477 case TPACKET_V2:
478 h.h2->tp_sec = ts.tv_sec;
479 h.h2->tp_nsec = ts.tv_nsec;
480 break;
481 case TPACKET_V3:
Daniel Borkmann57ea8842017-01-05 02:34:28 +0100482 h.h3->tp_sec = ts.tv_sec;
483 h.h3->tp_nsec = ts.tv_nsec;
484 break;
Willem de Bruijn2e313962013-04-23 00:39:28 +0000485 default:
486 WARN(1, "TPACKET version not supported.\n");
487 BUG();
488 }
489
490 /* one flush is safe, as both fields always lie on the same cacheline */
491 flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
492 smp_wmb();
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +0000493
494 return ts_status;
Willem de Bruijn2e313962013-04-23 00:39:28 +0000495}
496
Johann Baudy69e3c752009-05-18 22:11:22 -0700497static void *packet_lookup_frame(struct packet_sock *po,
498 struct packet_ring_buffer *rb,
499 unsigned int position,
500 int status)
501{
502 unsigned int pg_vec_pos, frame_offset;
Daniel Borkmann184f4892013-04-16 01:57:46 +0000503 union tpacket_uhdr h;
Johann Baudy69e3c752009-05-18 22:11:22 -0700504
505 pg_vec_pos = position / rb->frames_per_block;
506 frame_offset = position % rb->frames_per_block;
507
Neil Horman0e3125c2010-11-16 10:26:47 -0800508 h.raw = rb->pg_vec[pg_vec_pos].buffer +
509 (frame_offset * rb->frame_size);
Johann Baudy69e3c752009-05-18 22:11:22 -0700510
511 if (status != __packet_get_status(po, h.raw))
512 return NULL;
513
514 return h.raw;
515}
516
Olof Johanssoneea49cc92011-11-02 11:00:49 +0000517static void *packet_current_frame(struct packet_sock *po,
Johann Baudy69e3c752009-05-18 22:11:22 -0700518 struct packet_ring_buffer *rb,
519 int status)
520{
521 return packet_lookup_frame(po, rb, rb->head, status);
522}
523
chetan lokebc59ba32011-08-25 10:43:30 +0000524static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
chetan lokef6fb8f102011-08-19 10:18:16 +0000525{
526 del_timer_sync(&pkc->retire_blk_timer);
527}
528
529static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
chetan lokef6fb8f102011-08-19 10:18:16 +0000530 struct sk_buff_head *rb_queue)
531{
chetan lokebc59ba32011-08-25 10:43:30 +0000532 struct tpacket_kbdq_core *pkc;
chetan lokef6fb8f102011-08-19 10:18:16 +0000533
Tobias Klauser73d0fcf2015-07-28 14:21:26 +0200534 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
chetan lokef6fb8f102011-08-19 10:18:16 +0000535
Veaceslav Falicoec6f8092013-11-29 09:53:23 +0100536 spin_lock_bh(&rb_queue->lock);
chetan lokef6fb8f102011-08-19 10:18:16 +0000537 pkc->delete_blk_timer = 1;
Veaceslav Falicoec6f8092013-11-29 09:53:23 +0100538 spin_unlock_bh(&rb_queue->lock);
chetan lokef6fb8f102011-08-19 10:18:16 +0000539
540 prb_del_retire_blk_timer(pkc);
541}
542
543static void prb_init_blk_timer(struct packet_sock *po,
chetan lokebc59ba32011-08-25 10:43:30 +0000544 struct tpacket_kbdq_core *pkc,
chetan lokef6fb8f102011-08-19 10:18:16 +0000545 void (*func) (unsigned long))
546{
547 init_timer(&pkc->retire_blk_timer);
548 pkc->retire_blk_timer.data = (long)po;
549 pkc->retire_blk_timer.function = func;
550 pkc->retire_blk_timer.expires = jiffies;
551}
552
Maninder Singhe8e85cc2015-06-22 12:39:16 +0530553static void prb_setup_retire_blk_timer(struct packet_sock *po)
chetan lokef6fb8f102011-08-19 10:18:16 +0000554{
chetan lokebc59ba32011-08-25 10:43:30 +0000555 struct tpacket_kbdq_core *pkc;
chetan lokef6fb8f102011-08-19 10:18:16 +0000556
Maninder Singhe8e85cc2015-06-22 12:39:16 +0530557 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
chetan lokef6fb8f102011-08-19 10:18:16 +0000558 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
559}
560
561static int prb_calc_retire_blk_tmo(struct packet_sock *po,
562 int blk_size_in_bytes)
563{
564 struct net_device *dev;
565 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
David Decotigny7cad1ba2016-02-24 10:58:10 -0800566 struct ethtool_link_ksettings ecmd;
Jiri Pirko4bc71cb2011-09-03 03:34:30 +0000567 int err;
chetan lokef6fb8f102011-08-19 10:18:16 +0000568
Jiri Pirko4bc71cb2011-09-03 03:34:30 +0000569 rtnl_lock();
570 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
571 if (unlikely(!dev)) {
572 rtnl_unlock();
chetan lokef6fb8f102011-08-19 10:18:16 +0000573 return DEFAULT_PRB_RETIRE_TOV;
Jiri Pirko4bc71cb2011-09-03 03:34:30 +0000574 }
David Decotigny7cad1ba2016-02-24 10:58:10 -0800575 err = __ethtool_get_link_ksettings(dev, &ecmd);
Jiri Pirko4bc71cb2011-09-03 03:34:30 +0000576 rtnl_unlock();
577 if (!err) {
Jiri Pirko4bc71cb2011-09-03 03:34:30 +0000578 /*
579 * If the link speed is so slow you don't really
580 * need to worry about perf anyways
581 */
David Decotigny7cad1ba2016-02-24 10:58:10 -0800582 if (ecmd.base.speed < SPEED_1000 ||
583 ecmd.base.speed == SPEED_UNKNOWN) {
Jiri Pirko4bc71cb2011-09-03 03:34:30 +0000584 return DEFAULT_PRB_RETIRE_TOV;
parav.pandit@emulex.come440cf22012-06-27 03:56:12 +0000585 } else {
586 msec = 1;
David Decotigny7cad1ba2016-02-24 10:58:10 -0800587 div = ecmd.base.speed / 1000;
chetan lokef6fb8f102011-08-19 10:18:16 +0000588 }
589 }
590
591 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
592
593 if (div)
594 mbits /= div;
595
596 tmo = mbits * msec;
597
598 if (div)
599 return tmo+1;
600 return tmo;
601}
602
chetan lokebc59ba32011-08-25 10:43:30 +0000603static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
chetan lokef6fb8f102011-08-19 10:18:16 +0000604 union tpacket_req_u *req_u)
605{
606 p1->feature_req_word = req_u->req3.tp_feature_req_word;
607}
608
609static void init_prb_bdqc(struct packet_sock *po,
610 struct packet_ring_buffer *rb,
611 struct pgv *pg_vec,
Maninder Singhe8e85cc2015-06-22 12:39:16 +0530612 union tpacket_req_u *req_u)
chetan lokef6fb8f102011-08-19 10:18:16 +0000613{
Duan Jiong22781a52013-12-06 13:29:36 +0800614 struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
chetan lokebc59ba32011-08-25 10:43:30 +0000615 struct tpacket_block_desc *pbd;
chetan lokef6fb8f102011-08-19 10:18:16 +0000616
617 memset(p1, 0x0, sizeof(*p1));
618
619 p1->knxt_seq_num = 1;
620 p1->pkbdq = pg_vec;
chetan lokebc59ba32011-08-25 10:43:30 +0000621 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
Joe Perchese3192692012-06-03 17:41:40 +0000622 p1->pkblk_start = pg_vec[0].buffer;
chetan lokef6fb8f102011-08-19 10:18:16 +0000623 p1->kblk_size = req_u->req3.tp_block_size;
624 p1->knum_blocks = req_u->req3.tp_block_nr;
625 p1->hdrlen = po->tp_hdrlen;
626 p1->version = po->tp_version;
627 p1->last_kactive_blk_num = 0;
Daniel Borkmannee80fbf2013-04-19 06:12:29 +0000628 po->stats.stats3.tp_freeze_q_cnt = 0;
chetan lokef6fb8f102011-08-19 10:18:16 +0000629 if (req_u->req3.tp_retire_blk_tov)
630 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
631 else
632 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
633 req_u->req3.tp_block_size);
634 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
635 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
636
Eric Dumazetdc808112014-08-15 09:16:04 -0700637 p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
chetan lokef6fb8f102011-08-19 10:18:16 +0000638 prb_init_ft_ops(p1, req_u);
Maninder Singhe8e85cc2015-06-22 12:39:16 +0530639 prb_setup_retire_blk_timer(po);
chetan lokef6fb8f102011-08-19 10:18:16 +0000640 prb_open_block(p1, pbd);
641}
642
643/* Do NOT update the last_blk_num first.
644 * Assumes sk_buff_head lock is held.
645 */
chetan lokebc59ba32011-08-25 10:43:30 +0000646static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
chetan lokef6fb8f102011-08-19 10:18:16 +0000647{
648 mod_timer(&pkc->retire_blk_timer,
649 jiffies + pkc->tov_in_jiffies);
650 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
651}
652
653/*
654 * Timer logic:
655 * 1) We refresh the timer only when we open a block.
656 * By doing this we don't waste cycles refreshing the timer
657 * on packet-by-packet basis.
658 *
659 * With a 1MB block-size, on a 1Gbps line, it will take
660 * i) ~8 ms to fill a block + ii) memcpy etc.
661 * In this cut we are not accounting for the memcpy time.
662 *
663 * So, if the user sets the 'tmo' to 10ms then the timer
664 * will never fire while the block is still getting filled
665 * (which is what we want). However, the user could choose
666 * to close a block early and that's fine.
667 *
668 * But when the timer does fire, we check whether or not to refresh it.
669 * Since the tmo granularity is in msecs, it is not too expensive
670 * to refresh the timer, lets say every '8' msecs.
671 * Either the user can set the 'tmo' or we can derive it based on
672 * a) line-speed and b) block-size.
673 * prb_calc_retire_blk_tmo() calculates the tmo.
674 *
675 */
676static void prb_retire_rx_blk_timer_expired(unsigned long data)
677{
678 struct packet_sock *po = (struct packet_sock *)data;
Duan Jiong22781a52013-12-06 13:29:36 +0800679 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
chetan lokef6fb8f102011-08-19 10:18:16 +0000680 unsigned int frozen;
chetan lokebc59ba32011-08-25 10:43:30 +0000681 struct tpacket_block_desc *pbd;
chetan lokef6fb8f102011-08-19 10:18:16 +0000682
683 spin_lock(&po->sk.sk_receive_queue.lock);
684
685 frozen = prb_queue_frozen(pkc);
686 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
687
688 if (unlikely(pkc->delete_blk_timer))
689 goto out;
690
691 /* We only need to plug the race when the block is partially filled.
692 * tpacket_rcv:
693 * lock(); increment BLOCK_NUM_PKTS; unlock()
694 * copy_bits() is in progress ...
695 * timer fires on other cpu:
696 * we can't retire the current block because copy_bits
697 * is in progress.
698 *
699 */
700 if (BLOCK_NUM_PKTS(pbd)) {
701 while (atomic_read(&pkc->blk_fill_in_prog)) {
702 /* Waiting for skb_copy_bits to finish... */
703 cpu_relax();
704 }
705 }
706
707 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
708 if (!frozen) {
Alexander Drozdov41a50d62015-02-24 08:18:28 +0300709 if (!BLOCK_NUM_PKTS(pbd)) {
710 /* An empty block. Just refresh the timer. */
711 goto refresh_timer;
712 }
chetan lokef6fb8f102011-08-19 10:18:16 +0000713 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
714 if (!prb_dispatch_next_block(pkc, po))
715 goto refresh_timer;
716 else
717 goto out;
718 } else {
719 /* Case 1. Queue was frozen because user-space was
720 * lagging behind.
721 */
Rosen, Rami878cd3b2017-05-24 18:34:11 +0300722 if (prb_curr_blk_in_use(pbd)) {
chetan lokef6fb8f102011-08-19 10:18:16 +0000723 /*
724 * Ok, user-space is still behind.
725 * So just refresh the timer.
726 */
727 goto refresh_timer;
728 } else {
729 /* Case 2. queue was frozen,user-space caught up,
730 * now the link went idle && the timer fired.
731 * We don't have a block to close.So we open this
732 * block and restart the timer.
733 * opening a block thaws the queue,restarts timer
734 * Thawing/timer-refresh is a side effect.
735 */
736 prb_open_block(pkc, pbd);
737 goto out;
738 }
739 }
740 }
741
742refresh_timer:
743 _prb_refresh_rx_retire_blk_timer(pkc);
744
745out:
746 spin_unlock(&po->sk.sk_receive_queue.lock);
747}
748
Olof Johanssoneea49cc92011-11-02 11:00:49 +0000749static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
chetan lokebc59ba32011-08-25 10:43:30 +0000750 struct tpacket_block_desc *pbd1, __u32 status)
chetan lokef6fb8f102011-08-19 10:18:16 +0000751{
752 /* Flush everything minus the block header */
753
754#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
755 u8 *start, *end;
756
757 start = (u8 *)pbd1;
758
759 /* Skip the block header(we know header WILL fit in 4K) */
760 start += PAGE_SIZE;
761
762 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
763 for (; start < end; start += PAGE_SIZE)
764 flush_dcache_page(pgv_to_page(start));
765
766 smp_wmb();
767#endif
768
769 /* Now update the block status. */
770
771 BLOCK_STATUS(pbd1) = status;
772
773 /* Flush the block header */
774
775#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
776 start = (u8 *)pbd1;
777 flush_dcache_page(pgv_to_page(start));
778
779 smp_wmb();
780#endif
781}
782
783/*
784 * Side effect:
785 *
786 * 1) flush the block
787 * 2) Increment active_blk_num
788 *
789 * Note:We DONT refresh the timer on purpose.
790 * Because almost always the next block will be opened.
791 */
chetan lokebc59ba32011-08-25 10:43:30 +0000792static void prb_close_block(struct tpacket_kbdq_core *pkc1,
793 struct tpacket_block_desc *pbd1,
chetan lokef6fb8f102011-08-19 10:18:16 +0000794 struct packet_sock *po, unsigned int stat)
795{
796 __u32 status = TP_STATUS_USER | stat;
797
798 struct tpacket3_hdr *last_pkt;
chetan lokebc59ba32011-08-25 10:43:30 +0000799 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
Dan Collinsda413ee2014-12-19 16:49:25 +1300800 struct sock *sk = &po->sk;
chetan lokef6fb8f102011-08-19 10:18:16 +0000801
Daniel Borkmannee80fbf2013-04-19 06:12:29 +0000802 if (po->stats.stats3.tp_drops)
chetan lokef6fb8f102011-08-19 10:18:16 +0000803 status |= TP_STATUS_LOSING;
804
805 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
806 last_pkt->tp_next_offset = 0;
807
808 /* Get the ts of the last pkt */
809 if (BLOCK_NUM_PKTS(pbd1)) {
810 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
811 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
812 } else {
Alexander Drozdov41a50d62015-02-24 08:18:28 +0300813 /* Ok, we tmo'd - so get the current time.
814 *
815 * It shouldn't really happen as we don't close empty
816 * blocks. See prb_retire_rx_blk_timer_expired().
817 */
chetan lokef6fb8f102011-08-19 10:18:16 +0000818 struct timespec ts;
819 getnstimeofday(&ts);
820 h1->ts_last_pkt.ts_sec = ts.tv_sec;
821 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
822 }
823
824 smp_wmb();
825
826 /* Flush the block */
827 prb_flush_block(pkc1, pbd1, status);
828
Dan Collinsda413ee2014-12-19 16:49:25 +1300829 sk->sk_data_ready(sk);
830
chetan lokef6fb8f102011-08-19 10:18:16 +0000831 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
832}
833
Olof Johanssoneea49cc92011-11-02 11:00:49 +0000834static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
chetan lokef6fb8f102011-08-19 10:18:16 +0000835{
836 pkc->reset_pending_on_curr_blk = 0;
837}
838
839/*
840 * Side effect of opening a block:
841 *
842 * 1) prb_queue is thawed.
843 * 2) retire_blk_timer is refreshed.
844 *
845 */
chetan lokebc59ba32011-08-25 10:43:30 +0000846static void prb_open_block(struct tpacket_kbdq_core *pkc1,
847 struct tpacket_block_desc *pbd1)
chetan lokef6fb8f102011-08-19 10:18:16 +0000848{
849 struct timespec ts;
chetan lokebc59ba32011-08-25 10:43:30 +0000850 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
chetan lokef6fb8f102011-08-19 10:18:16 +0000851
852 smp_rmb();
853
Daniel Borkmann8da30562013-05-03 02:57:00 +0000854 /* We could have just memset this but we will lose the
855 * flexibility of making the priv area sticky
856 */
chetan lokef6fb8f102011-08-19 10:18:16 +0000857
Daniel Borkmann8da30562013-05-03 02:57:00 +0000858 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
859 BLOCK_NUM_PKTS(pbd1) = 0;
860 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
chetan lokef6fb8f102011-08-19 10:18:16 +0000861
Daniel Borkmann8da30562013-05-03 02:57:00 +0000862 getnstimeofday(&ts);
chetan lokef6fb8f102011-08-19 10:18:16 +0000863
Daniel Borkmann8da30562013-05-03 02:57:00 +0000864 h1->ts_first_pkt.ts_sec = ts.tv_sec;
865 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
chetan lokef6fb8f102011-08-19 10:18:16 +0000866
Daniel Borkmann8da30562013-05-03 02:57:00 +0000867 pkc1->pkblk_start = (char *)pbd1;
868 pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
869
870 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
871 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
872
873 pbd1->version = pkc1->version;
874 pkc1->prev = pkc1->nxt_offset;
875 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
876
877 prb_thaw_queue(pkc1);
878 _prb_refresh_rx_retire_blk_timer(pkc1);
879
880 smp_wmb();
chetan lokef6fb8f102011-08-19 10:18:16 +0000881}
882
883/*
884 * Queue freeze logic:
885 * 1) Assume tp_block_nr = 8 blocks.
886 * 2) At time 't0', user opens Rx ring.
887 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
888 * 4) user-space is either sleeping or processing block '0'.
889 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
890 * it will close block-7,loop around and try to fill block '0'.
891 * call-flow:
892 * __packet_lookup_frame_in_block
893 * prb_retire_current_block()
894 * prb_dispatch_next_block()
895 * |->(BLOCK_STATUS == USER) evaluates to true
896 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
897 * 6) Now there are two cases:
898 * 6.1) Link goes idle right after the queue is frozen.
899 * But remember, the last open_block() refreshed the timer.
900 * When this timer expires,it will refresh itself so that we can
901 * re-open block-0 in near future.
902 * 6.2) Link is busy and keeps on receiving packets. This is a simple
903 * case and __packet_lookup_frame_in_block will check if block-0
904 * is free and can now be re-used.
905 */
Olof Johanssoneea49cc92011-11-02 11:00:49 +0000906static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
chetan lokef6fb8f102011-08-19 10:18:16 +0000907 struct packet_sock *po)
908{
909 pkc->reset_pending_on_curr_blk = 1;
Daniel Borkmannee80fbf2013-04-19 06:12:29 +0000910 po->stats.stats3.tp_freeze_q_cnt++;
chetan lokef6fb8f102011-08-19 10:18:16 +0000911}
912
913#define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
914
915/*
916 * If the next block is free then we will dispatch it
917 * and return a good offset.
918 * Else, we will freeze the queue.
919 * So, caller must check the return value.
920 */
chetan lokebc59ba32011-08-25 10:43:30 +0000921static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
chetan lokef6fb8f102011-08-19 10:18:16 +0000922 struct packet_sock *po)
923{
chetan lokebc59ba32011-08-25 10:43:30 +0000924 struct tpacket_block_desc *pbd;
chetan lokef6fb8f102011-08-19 10:18:16 +0000925
926 smp_rmb();
927
928 /* 1. Get current block num */
929 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
930
931 /* 2. If this block is currently in_use then freeze the queue */
932 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
933 prb_freeze_queue(pkc, po);
934 return NULL;
935 }
936
937 /*
938 * 3.
939 * open this block and return the offset where the first packet
940 * needs to get stored.
941 */
942 prb_open_block(pkc, pbd);
943 return (void *)pkc->nxt_offset;
944}
945
chetan lokebc59ba32011-08-25 10:43:30 +0000946static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
chetan lokef6fb8f102011-08-19 10:18:16 +0000947 struct packet_sock *po, unsigned int status)
948{
chetan lokebc59ba32011-08-25 10:43:30 +0000949 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
chetan lokef6fb8f102011-08-19 10:18:16 +0000950
951 /* retire/close the current block */
952 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
953 /*
954 * Plug the case where copy_bits() is in progress on
955 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
956 * have space to copy the pkt in the current block and
957 * called prb_retire_current_block()
958 *
959 * We don't need to worry about the TMO case because
960 * the timer-handler already handled this case.
961 */
962 if (!(status & TP_STATUS_BLK_TMO)) {
963 while (atomic_read(&pkc->blk_fill_in_prog)) {
964 /* Waiting for skb_copy_bits to finish... */
965 cpu_relax();
966 }
967 }
968 prb_close_block(pkc, pbd, po, status);
969 return;
970 }
chetan lokef6fb8f102011-08-19 10:18:16 +0000971}
972
Rosen, Rami878cd3b2017-05-24 18:34:11 +0300973static int prb_curr_blk_in_use(struct tpacket_block_desc *pbd)
chetan lokef6fb8f102011-08-19 10:18:16 +0000974{
975 return TP_STATUS_USER & BLOCK_STATUS(pbd);
976}
977
Olof Johanssoneea49cc92011-11-02 11:00:49 +0000978static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
chetan lokef6fb8f102011-08-19 10:18:16 +0000979{
980 return pkc->reset_pending_on_curr_blk;
981}
982
Olof Johanssoneea49cc92011-11-02 11:00:49 +0000983static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
chetan lokef6fb8f102011-08-19 10:18:16 +0000984{
chetan lokebc59ba32011-08-25 10:43:30 +0000985 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
chetan lokef6fb8f102011-08-19 10:18:16 +0000986 atomic_dec(&pkc->blk_fill_in_prog);
987}
988
Olof Johanssoneea49cc92011-11-02 11:00:49 +0000989static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
chetan lokef6fb8f102011-08-19 10:18:16 +0000990 struct tpacket3_hdr *ppd)
991{
Tom Herbert3958afa1b2013-12-15 22:12:06 -0800992 ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
chetan lokef6fb8f102011-08-19 10:18:16 +0000993}
994
Olof Johanssoneea49cc92011-11-02 11:00:49 +0000995static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
chetan lokef6fb8f102011-08-19 10:18:16 +0000996 struct tpacket3_hdr *ppd)
997{
998 ppd->hv1.tp_rxhash = 0;
999}
1000
Olof Johanssoneea49cc92011-11-02 11:00:49 +00001001static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
chetan lokef6fb8f102011-08-19 10:18:16 +00001002 struct tpacket3_hdr *ppd)
1003{
Jiri Pirkodf8a39d2015-01-13 17:13:44 +01001004 if (skb_vlan_tag_present(pkc->skb)) {
1005 ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
Atzm Watanabea0cdfcf2013-12-17 22:53:40 +09001006 ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
1007 ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
chetan lokef6fb8f102011-08-19 10:18:16 +00001008 } else {
danborkmann@iogearbox.net9e670302012-08-20 03:34:03 +00001009 ppd->hv1.tp_vlan_tci = 0;
Atzm Watanabea0cdfcf2013-12-17 22:53:40 +09001010 ppd->hv1.tp_vlan_tpid = 0;
danborkmann@iogearbox.net9e670302012-08-20 03:34:03 +00001011 ppd->tp_status = TP_STATUS_AVAILABLE;
chetan lokef6fb8f102011-08-19 10:18:16 +00001012 }
1013}
1014
chetan lokebc59ba32011-08-25 10:43:30 +00001015static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
chetan lokef6fb8f102011-08-19 10:18:16 +00001016 struct tpacket3_hdr *ppd)
1017{
Atzm Watanabea0cdfcf2013-12-17 22:53:40 +09001018 ppd->hv1.tp_padding = 0;
chetan lokef6fb8f102011-08-19 10:18:16 +00001019 prb_fill_vlan_info(pkc, ppd);
1020
1021 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
1022 prb_fill_rxhash(pkc, ppd);
1023 else
1024 prb_clear_rxhash(pkc, ppd);
1025}
1026
Olof Johanssoneea49cc92011-11-02 11:00:49 +00001027static void prb_fill_curr_block(char *curr,
chetan lokebc59ba32011-08-25 10:43:30 +00001028 struct tpacket_kbdq_core *pkc,
1029 struct tpacket_block_desc *pbd,
chetan lokef6fb8f102011-08-19 10:18:16 +00001030 unsigned int len)
1031{
1032 struct tpacket3_hdr *ppd;
1033
1034 ppd = (struct tpacket3_hdr *)curr;
1035 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1036 pkc->prev = curr;
1037 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1038 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1039 BLOCK_NUM_PKTS(pbd) += 1;
1040 atomic_inc(&pkc->blk_fill_in_prog);
1041 prb_run_all_ft_ops(pkc, ppd);
1042}
1043
1044/* Assumes caller has the sk->rx_queue.lock */
1045static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1046 struct sk_buff *skb,
1047 int status,
1048 unsigned int len
1049 )
1050{
chetan lokebc59ba32011-08-25 10:43:30 +00001051 struct tpacket_kbdq_core *pkc;
1052 struct tpacket_block_desc *pbd;
chetan lokef6fb8f102011-08-19 10:18:16 +00001053 char *curr, *end;
1054
Joe Perchese3192692012-06-03 17:41:40 +00001055 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
chetan lokef6fb8f102011-08-19 10:18:16 +00001056 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1057
1058 /* Queue is frozen when user space is lagging behind */
1059 if (prb_queue_frozen(pkc)) {
1060 /*
1061 * Check if that last block which caused the queue to freeze,
1062 * is still in_use by user-space.
1063 */
Rosen, Rami878cd3b2017-05-24 18:34:11 +03001064 if (prb_curr_blk_in_use(pbd)) {
chetan lokef6fb8f102011-08-19 10:18:16 +00001065 /* Can't record this packet */
1066 return NULL;
1067 } else {
1068 /*
1069 * Ok, the block was released by user-space.
1070 * Now let's open that block.
1071 * opening a block also thaws the queue.
1072 * Thawing is a side effect.
1073 */
1074 prb_open_block(pkc, pbd);
1075 }
1076 }
1077
1078 smp_mb();
1079 curr = pkc->nxt_offset;
1080 pkc->skb = skb;
Joe Perchese3192692012-06-03 17:41:40 +00001081 end = (char *)pbd + pkc->kblk_size;
chetan lokef6fb8f102011-08-19 10:18:16 +00001082
1083 /* first try the current block */
1084 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1085 prb_fill_curr_block(curr, pkc, pbd, len);
1086 return (void *)curr;
1087 }
1088
1089 /* Ok, close the current block */
1090 prb_retire_current_block(pkc, po, 0);
1091
1092 /* Now, try to dispatch the next block */
1093 curr = (char *)prb_dispatch_next_block(pkc, po);
1094 if (curr) {
1095 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1096 prb_fill_curr_block(curr, pkc, pbd, len);
1097 return (void *)curr;
1098 }
1099
1100 /*
1101 * No free blocks are available.user_space hasn't caught up yet.
1102 * Queue was just frozen and now this packet will get dropped.
1103 */
1104 return NULL;
1105}
1106
Olof Johanssoneea49cc92011-11-02 11:00:49 +00001107static void *packet_current_rx_frame(struct packet_sock *po,
chetan lokef6fb8f102011-08-19 10:18:16 +00001108 struct sk_buff *skb,
1109 int status, unsigned int len)
1110{
1111 char *curr = NULL;
1112 switch (po->tp_version) {
1113 case TPACKET_V1:
1114 case TPACKET_V2:
1115 curr = packet_lookup_frame(po, &po->rx_ring,
1116 po->rx_ring.head, status);
1117 return curr;
1118 case TPACKET_V3:
1119 return __packet_lookup_frame_in_block(po, skb, status, len);
1120 default:
1121 WARN(1, "TPACKET version not supported\n");
1122 BUG();
Ying Xue99aa3472012-08-06 16:27:10 +00001123 return NULL;
chetan lokef6fb8f102011-08-19 10:18:16 +00001124 }
1125}
1126
Olof Johanssoneea49cc92011-11-02 11:00:49 +00001127static void *prb_lookup_block(struct packet_sock *po,
chetan lokef6fb8f102011-08-19 10:18:16 +00001128 struct packet_ring_buffer *rb,
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001129 unsigned int idx,
chetan lokef6fb8f102011-08-19 10:18:16 +00001130 int status)
1131{
chetan lokebc59ba32011-08-25 10:43:30 +00001132 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001133 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
chetan lokef6fb8f102011-08-19 10:18:16 +00001134
1135 if (status != BLOCK_STATUS(pbd))
1136 return NULL;
1137 return pbd;
1138}
1139
Olof Johanssoneea49cc92011-11-02 11:00:49 +00001140static int prb_previous_blk_num(struct packet_ring_buffer *rb)
chetan lokef6fb8f102011-08-19 10:18:16 +00001141{
1142 unsigned int prev;
1143 if (rb->prb_bdqc.kactive_blk_num)
1144 prev = rb->prb_bdqc.kactive_blk_num-1;
1145 else
1146 prev = rb->prb_bdqc.knum_blocks-1;
1147 return prev;
1148}
1149
1150/* Assumes caller has held the rx_queue.lock */
Olof Johanssoneea49cc92011-11-02 11:00:49 +00001151static void *__prb_previous_block(struct packet_sock *po,
chetan lokef6fb8f102011-08-19 10:18:16 +00001152 struct packet_ring_buffer *rb,
1153 int status)
1154{
1155 unsigned int previous = prb_previous_blk_num(rb);
1156 return prb_lookup_block(po, rb, previous, status);
1157}
1158
Olof Johanssoneea49cc92011-11-02 11:00:49 +00001159static void *packet_previous_rx_frame(struct packet_sock *po,
chetan lokef6fb8f102011-08-19 10:18:16 +00001160 struct packet_ring_buffer *rb,
1161 int status)
1162{
1163 if (po->tp_version <= TPACKET_V2)
1164 return packet_previous_frame(po, rb, status);
1165
1166 return __prb_previous_block(po, rb, status);
1167}
1168
Olof Johanssoneea49cc92011-11-02 11:00:49 +00001169static void packet_increment_rx_head(struct packet_sock *po,
chetan lokef6fb8f102011-08-19 10:18:16 +00001170 struct packet_ring_buffer *rb)
1171{
1172 switch (po->tp_version) {
1173 case TPACKET_V1:
1174 case TPACKET_V2:
1175 return packet_increment_head(rb);
1176 case TPACKET_V3:
1177 default:
1178 WARN(1, "TPACKET version not supported.\n");
1179 BUG();
1180 return;
1181 }
1182}
1183
Olof Johanssoneea49cc92011-11-02 11:00:49 +00001184static void *packet_previous_frame(struct packet_sock *po,
Johann Baudy69e3c752009-05-18 22:11:22 -07001185 struct packet_ring_buffer *rb,
1186 int status)
1187{
1188 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1189 return packet_lookup_frame(po, rb, previous, status);
1190}
1191
Olof Johanssoneea49cc92011-11-02 11:00:49 +00001192static void packet_increment_head(struct packet_ring_buffer *buff)
Johann Baudy69e3c752009-05-18 22:11:22 -07001193{
1194 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1195}
1196
Daniel Borkmannb0138402014-01-15 16:25:36 +01001197static void packet_inc_pending(struct packet_ring_buffer *rb)
1198{
1199 this_cpu_inc(*rb->pending_refcnt);
1200}
1201
1202static void packet_dec_pending(struct packet_ring_buffer *rb)
1203{
1204 this_cpu_dec(*rb->pending_refcnt);
1205}
1206
1207static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
1208{
1209 unsigned int refcnt = 0;
1210 int cpu;
1211
1212 /* We don't use pending refcount in rx_ring. */
1213 if (rb->pending_refcnt == NULL)
1214 return 0;
1215
1216 for_each_possible_cpu(cpu)
1217 refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
1218
1219 return refcnt;
1220}
1221
1222static int packet_alloc_pending(struct packet_sock *po)
1223{
1224 po->rx_ring.pending_refcnt = NULL;
1225
1226 po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
1227 if (unlikely(po->tx_ring.pending_refcnt == NULL))
1228 return -ENOBUFS;
1229
1230 return 0;
1231}
1232
1233static void packet_free_pending(struct packet_sock *po)
1234{
1235 free_percpu(po->tx_ring.pending_refcnt);
1236}
1237
Willem de Bruijn99547292015-05-12 11:56:47 -04001238#define ROOM_POW_OFF 2
1239#define ROOM_NONE 0x0
1240#define ROOM_LOW 0x1
1241#define ROOM_NORMAL 0x2
1242
1243static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
1244{
1245 int idx, len;
1246
1247 len = po->rx_ring.frame_max + 1;
1248 idx = po->rx_ring.head;
1249 if (pow_off)
1250 idx += len >> pow_off;
1251 if (idx >= len)
1252 idx -= len;
1253 return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1254}
1255
1256static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
1257{
1258 int idx, len;
1259
1260 len = po->rx_ring.prb_bdqc.knum_blocks;
1261 idx = po->rx_ring.prb_bdqc.kactive_blk_num;
1262 if (pow_off)
1263 idx += len >> pow_off;
1264 if (idx >= len)
1265 idx -= len;
1266 return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1267}
1268
Willem de Bruijn2ccdbaa2015-05-12 11:56:48 -04001269static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001270{
1271 struct sock *sk = &po->sk;
Willem de Bruijn99547292015-05-12 11:56:47 -04001272 int ret = ROOM_NONE;
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001273
Willem de Bruijn99547292015-05-12 11:56:47 -04001274 if (po->prot_hook.func != tpacket_rcv) {
1275 int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
Willem de Bruijn2ccdbaa2015-05-12 11:56:48 -04001276 - (skb ? skb->truesize : 0);
Willem de Bruijn99547292015-05-12 11:56:47 -04001277 if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
1278 return ROOM_NORMAL;
1279 else if (avail > 0)
1280 return ROOM_LOW;
1281 else
1282 return ROOM_NONE;
1283 }
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001284
Willem de Bruijn99547292015-05-12 11:56:47 -04001285 if (po->tp_version == TPACKET_V3) {
1286 if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
1287 ret = ROOM_NORMAL;
1288 else if (__tpacket_v3_has_room(po, 0))
1289 ret = ROOM_LOW;
1290 } else {
1291 if (__tpacket_has_room(po, ROOM_POW_OFF))
1292 ret = ROOM_NORMAL;
1293 else if (__tpacket_has_room(po, 0))
1294 ret = ROOM_LOW;
1295 }
Willem de Bruijn2ccdbaa2015-05-12 11:56:48 -04001296
1297 return ret;
1298}
1299
1300static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1301{
1302 int ret;
1303 bool has_room;
1304
Willem de Bruijn54d7c012015-05-14 15:25:02 -04001305 spin_lock_bh(&po->sk.sk_receive_queue.lock);
1306 ret = __packet_rcv_has_room(po, skb);
Willem de Bruijn2ccdbaa2015-05-12 11:56:48 -04001307 has_room = ret == ROOM_NORMAL;
1308 if (po->pressure == has_room)
Willem de Bruijn54d7c012015-05-14 15:25:02 -04001309 po->pressure = !has_room;
1310 spin_unlock_bh(&po->sk.sk_receive_queue.lock);
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001311
Willem de Bruijn99547292015-05-12 11:56:47 -04001312 return ret;
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001313}
1314
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315static void packet_sock_destruct(struct sock *sk)
1316{
Richard Cochraned85b562010-04-07 22:41:28 +00001317 skb_queue_purge(&sk->sk_error_queue);
1318
Ilpo Järvinen547b7922008-07-25 21:43:18 -07001319 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
Reshetova, Elena14afee42017-06-30 13:08:00 +03001320 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321
1322 if (!sock_flag(sk, SOCK_DEAD)) {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001323 pr_err("Attempt to release alive packet socket: %p\n", sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 return;
1325 }
1326
Pavel Emelyanov17ab56a2007-11-10 21:38:48 -08001327 sk_refcnt_debug_dec(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328}
1329
Willem de Bruijn3b3a5b02015-05-12 11:56:49 -04001330static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
1331{
1332 u32 rxhash;
1333 int i, count = 0;
1334
1335 rxhash = skb_get_hash(skb);
1336 for (i = 0; i < ROLLOVER_HLEN; i++)
1337 if (po->rollover->history[i] == rxhash)
1338 count++;
1339
1340 po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash;
1341 return count > (ROLLOVER_HLEN >> 1);
1342}
1343
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001344static unsigned int fanout_demux_hash(struct packet_fanout *f,
1345 struct sk_buff *skb,
1346 unsigned int num)
David S. Millerdc99f602011-07-05 01:45:05 -07001347{
David S. Millereb70db82016-07-01 16:07:50 -04001348 return reciprocal_scale(__skb_get_hash_symmetric(skb), num);
David S. Millerdc99f602011-07-05 01:45:05 -07001349}
1350
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001351static unsigned int fanout_demux_lb(struct packet_fanout *f,
1352 struct sk_buff *skb,
1353 unsigned int num)
David S. Millerdc99f602011-07-05 01:45:05 -07001354{
Willem de Bruijn468479e2015-06-17 15:59:34 -04001355 unsigned int val = atomic_inc_return(&f->rr_cur);
David S. Millerdc99f602011-07-05 01:45:05 -07001356
Willem de Bruijn468479e2015-06-17 15:59:34 -04001357 return val % num;
David S. Millerdc99f602011-07-05 01:45:05 -07001358}
1359
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001360static unsigned int fanout_demux_cpu(struct packet_fanout *f,
1361 struct sk_buff *skb,
1362 unsigned int num)
David S. Miller95ec3eb2011-07-06 01:56:38 -07001363{
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001364 return smp_processor_id() % num;
1365}
David S. Miller95ec3eb2011-07-06 01:56:38 -07001366
Daniel Borkmann5df0ddf2013-08-28 22:13:09 +02001367static unsigned int fanout_demux_rnd(struct packet_fanout *f,
1368 struct sk_buff *skb,
1369 unsigned int num)
1370{
Daniel Borkmannf337db62014-01-22 02:29:39 +01001371 return prandom_u32_max(num);
Daniel Borkmann5df0ddf2013-08-28 22:13:09 +02001372}
1373
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001374static unsigned int fanout_demux_rollover(struct packet_fanout *f,
1375 struct sk_buff *skb,
Willem de Bruijnad377ca2015-05-12 11:56:45 -04001376 unsigned int idx, bool try_self,
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001377 unsigned int num)
1378{
Willem de Bruijn4633c9e2015-05-17 19:44:02 -04001379 struct packet_sock *po, *po_next, *po_skip = NULL;
Willem de Bruijna9b63912015-05-12 11:56:50 -04001380 unsigned int i, j, room = ROOM_NONE;
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001381
Willem de Bruijn0648ab72015-05-12 11:56:46 -04001382 po = pkt_sk(f->arr[idx]);
Willem de Bruijn3b3a5b02015-05-12 11:56:49 -04001383
1384 if (try_self) {
1385 room = packet_rcv_has_room(po, skb);
1386 if (room == ROOM_NORMAL ||
1387 (room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
1388 return idx;
Willem de Bruijn4633c9e2015-05-17 19:44:02 -04001389 po_skip = po;
Willem de Bruijn3b3a5b02015-05-12 11:56:49 -04001390 }
Willem de Bruijnad377ca2015-05-12 11:56:45 -04001391
Willem de Bruijn0648ab72015-05-12 11:56:46 -04001392 i = j = min_t(int, po->rollover->sock, num - 1);
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001393 do {
Willem de Bruijn2ccdbaa2015-05-12 11:56:48 -04001394 po_next = pkt_sk(f->arr[i]);
Willem de Bruijn4633c9e2015-05-17 19:44:02 -04001395 if (po_next != po_skip && !po_next->pressure &&
Willem de Bruijn2ccdbaa2015-05-12 11:56:48 -04001396 packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001397 if (i != j)
Willem de Bruijn0648ab72015-05-12 11:56:46 -04001398 po->rollover->sock = i;
Willem de Bruijna9b63912015-05-12 11:56:50 -04001399 atomic_long_inc(&po->rollover->num);
1400 if (room == ROOM_LOW)
1401 atomic_long_inc(&po->rollover->num_huge);
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001402 return i;
1403 }
Willem de Bruijnad377ca2015-05-12 11:56:45 -04001404
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001405 if (++i == num)
1406 i = 0;
1407 } while (i != j);
1408
Willem de Bruijna9b63912015-05-12 11:56:50 -04001409 atomic_long_inc(&po->rollover->num_failed);
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001410 return idx;
1411}
1412
Neil Horman2d360972014-01-22 16:01:44 -05001413static unsigned int fanout_demux_qm(struct packet_fanout *f,
1414 struct sk_buff *skb,
1415 unsigned int num)
1416{
1417 return skb_get_queue_mapping(skb) % num;
1418}
1419
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001420static unsigned int fanout_demux_bpf(struct packet_fanout *f,
1421 struct sk_buff *skb,
1422 unsigned int num)
1423{
1424 struct bpf_prog *prog;
1425 unsigned int ret = 0;
1426
1427 rcu_read_lock();
1428 prog = rcu_dereference(f->bpf_prog);
1429 if (prog)
Alexei Starovoitovff936a02015-10-07 10:55:41 -07001430 ret = bpf_prog_run_clear_cb(prog, skb) % num;
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001431 rcu_read_unlock();
1432
1433 return ret;
1434}
1435
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001436static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
1437{
1438 return f->flags & (flag >> 8);
David S. Miller95ec3eb2011-07-06 01:56:38 -07001439}
1440
David S. Miller95ec3eb2011-07-06 01:56:38 -07001441static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1442 struct packet_type *pt, struct net_device *orig_dev)
David S. Millerdc99f602011-07-05 01:45:05 -07001443{
1444 struct packet_fanout *f = pt->af_packet_priv;
Eric Dumazetf98f4512015-06-16 07:59:11 -07001445 unsigned int num = READ_ONCE(f->num_members);
Eric W. Biederman19bcf9f2015-10-09 13:44:54 -05001446 struct net *net = read_pnet(&f->net);
David S. Millerdc99f602011-07-05 01:45:05 -07001447 struct packet_sock *po;
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001448 unsigned int idx;
David S. Millerdc99f602011-07-05 01:45:05 -07001449
Eric W. Biederman19bcf9f2015-10-09 13:44:54 -05001450 if (!net_eq(dev_net(dev), net) || !num) {
David S. Millerdc99f602011-07-05 01:45:05 -07001451 kfree_skb(skb);
1452 return 0;
1453 }
1454
Alexander Drozdov3f34b242015-02-20 08:24:27 +03001455 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
Eric W. Biederman19bcf9f2015-10-09 13:44:54 -05001456 skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET);
Alexander Drozdov3f34b242015-02-20 08:24:27 +03001457 if (!skb)
1458 return 0;
1459 }
David S. Miller95ec3eb2011-07-06 01:56:38 -07001460 switch (f->type) {
1461 case PACKET_FANOUT_HASH:
1462 default:
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001463 idx = fanout_demux_hash(f, skb, num);
David S. Miller95ec3eb2011-07-06 01:56:38 -07001464 break;
1465 case PACKET_FANOUT_LB:
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001466 idx = fanout_demux_lb(f, skb, num);
David S. Miller95ec3eb2011-07-06 01:56:38 -07001467 break;
1468 case PACKET_FANOUT_CPU:
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001469 idx = fanout_demux_cpu(f, skb, num);
1470 break;
Daniel Borkmann5df0ddf2013-08-28 22:13:09 +02001471 case PACKET_FANOUT_RND:
1472 idx = fanout_demux_rnd(f, skb, num);
1473 break;
Neil Horman2d360972014-01-22 16:01:44 -05001474 case PACKET_FANOUT_QM:
1475 idx = fanout_demux_qm(f, skb, num);
1476 break;
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001477 case PACKET_FANOUT_ROLLOVER:
Willem de Bruijnad377ca2015-05-12 11:56:45 -04001478 idx = fanout_demux_rollover(f, skb, 0, false, num);
David S. Miller95ec3eb2011-07-06 01:56:38 -07001479 break;
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001480 case PACKET_FANOUT_CBPF:
Willem de Bruijnf2e52092015-08-14 22:31:35 -04001481 case PACKET_FANOUT_EBPF:
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001482 idx = fanout_demux_bpf(f, skb, num);
1483 break;
David S. Miller7736d332011-07-05 01:43:20 -07001484 }
1485
Willem de Bruijnad377ca2015-05-12 11:56:45 -04001486 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
1487 idx = fanout_demux_rollover(f, skb, idx, true, num);
David S. Millerdc99f602011-07-05 01:45:05 -07001488
Willem de Bruijnad377ca2015-05-12 11:56:45 -04001489 po = pkt_sk(f->arr[idx]);
David S. Millerdc99f602011-07-05 01:45:05 -07001490 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1491}
1492
Pavel Emelyanovfff33212012-08-16 05:36:48 +00001493DEFINE_MUTEX(fanout_mutex);
1494EXPORT_SYMBOL_GPL(fanout_mutex);
David S. Millerdc99f602011-07-05 01:45:05 -07001495static LIST_HEAD(fanout_list);
Mike Maloney4a69a862017-04-21 10:56:11 -04001496static u16 fanout_next_id;
David S. Millerdc99f602011-07-05 01:45:05 -07001497
1498static void __fanout_link(struct sock *sk, struct packet_sock *po)
1499{
1500 struct packet_fanout *f = po->fanout;
1501
1502 spin_lock(&f->lock);
1503 f->arr[f->num_members] = sk;
1504 smp_wmb();
1505 f->num_members++;
Anoob Soman2bd624b2017-02-15 20:25:39 +00001506 if (f->num_members == 1)
1507 dev_add_pack(&f->prot_hook);
David S. Millerdc99f602011-07-05 01:45:05 -07001508 spin_unlock(&f->lock);
1509}
1510
1511static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1512{
1513 struct packet_fanout *f = po->fanout;
1514 int i;
1515
1516 spin_lock(&f->lock);
1517 for (i = 0; i < f->num_members; i++) {
1518 if (f->arr[i] == sk)
1519 break;
1520 }
1521 BUG_ON(i >= f->num_members);
1522 f->arr[i] = f->arr[f->num_members - 1];
1523 f->num_members--;
Anoob Soman2bd624b2017-02-15 20:25:39 +00001524 if (f->num_members == 0)
1525 __dev_remove_pack(&f->prot_hook);
David S. Millerdc99f602011-07-05 01:45:05 -07001526 spin_unlock(&f->lock);
1527}
1528
Weilong Chend4dd8ae2013-12-23 11:31:38 +08001529static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
Eric Leblondc0de08d2012-08-16 22:02:58 +00001530{
Eric Dumazet161642e2015-10-09 11:29:32 -07001531 if (sk->sk_family != PF_PACKET)
1532 return false;
Eric Leblondc0de08d2012-08-16 22:02:58 +00001533
Eric Dumazet161642e2015-10-09 11:29:32 -07001534 return ptype->af_packet_priv == pkt_sk(sk)->fanout;
Eric Leblondc0de08d2012-08-16 22:02:58 +00001535}
1536
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001537static void fanout_init_data(struct packet_fanout *f)
1538{
1539 switch (f->type) {
1540 case PACKET_FANOUT_LB:
1541 atomic_set(&f->rr_cur, 0);
1542 break;
1543 case PACKET_FANOUT_CBPF:
Willem de Bruijnf2e52092015-08-14 22:31:35 -04001544 case PACKET_FANOUT_EBPF:
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001545 RCU_INIT_POINTER(f->bpf_prog, NULL);
1546 break;
1547 }
1548}
1549
1550static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
1551{
1552 struct bpf_prog *old;
1553
1554 spin_lock(&f->lock);
1555 old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
1556 rcu_assign_pointer(f->bpf_prog, new);
1557 spin_unlock(&f->lock);
1558
1559 if (old) {
1560 synchronize_net();
1561 bpf_prog_destroy(old);
1562 }
1563}
1564
1565static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
1566 unsigned int len)
1567{
1568 struct bpf_prog *new;
1569 struct sock_fprog fprog;
1570 int ret;
1571
1572 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1573 return -EPERM;
1574 if (len != sizeof(fprog))
1575 return -EINVAL;
1576 if (copy_from_user(&fprog, data, len))
1577 return -EFAULT;
1578
Daniel Borkmannbab18992015-10-02 15:17:33 +02001579 ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001580 if (ret)
1581 return ret;
1582
1583 __fanout_set_data_bpf(po->fanout, new);
1584 return 0;
1585}
1586
Willem de Bruijnf2e52092015-08-14 22:31:35 -04001587static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
1588 unsigned int len)
1589{
1590 struct bpf_prog *new;
1591 u32 fd;
1592
1593 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1594 return -EPERM;
1595 if (len != sizeof(fd))
1596 return -EINVAL;
1597 if (copy_from_user(&fd, data, len))
1598 return -EFAULT;
1599
Daniel Borkmann113214b2016-06-30 17:24:44 +02001600 new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
Willem de Bruijnf2e52092015-08-14 22:31:35 -04001601 if (IS_ERR(new))
1602 return PTR_ERR(new);
Willem de Bruijnf2e52092015-08-14 22:31:35 -04001603
1604 __fanout_set_data_bpf(po->fanout, new);
1605 return 0;
1606}
1607
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001608static int fanout_set_data(struct packet_sock *po, char __user *data,
1609 unsigned int len)
1610{
1611 switch (po->fanout->type) {
1612 case PACKET_FANOUT_CBPF:
1613 return fanout_set_data_cbpf(po, data, len);
Willem de Bruijnf2e52092015-08-14 22:31:35 -04001614 case PACKET_FANOUT_EBPF:
1615 return fanout_set_data_ebpf(po, data, len);
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001616 default:
1617 return -EINVAL;
1618 };
1619}
1620
1621static void fanout_release_data(struct packet_fanout *f)
1622{
1623 switch (f->type) {
1624 case PACKET_FANOUT_CBPF:
Willem de Bruijnf2e52092015-08-14 22:31:35 -04001625 case PACKET_FANOUT_EBPF:
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001626 __fanout_set_data_bpf(f, NULL);
1627 };
1628}
1629
Mike Maloney4a69a862017-04-21 10:56:11 -04001630static bool __fanout_id_is_free(struct sock *sk, u16 candidate_id)
1631{
1632 struct packet_fanout *f;
1633
1634 list_for_each_entry(f, &fanout_list, list) {
1635 if (f->id == candidate_id &&
1636 read_pnet(&f->net) == sock_net(sk)) {
1637 return false;
1638 }
1639 }
1640 return true;
1641}
1642
1643static bool fanout_find_new_id(struct sock *sk, u16 *new_id)
1644{
1645 u16 id = fanout_next_id;
1646
1647 do {
1648 if (__fanout_id_is_free(sk, id)) {
1649 *new_id = id;
1650 fanout_next_id = id + 1;
1651 return true;
1652 }
1653
1654 id++;
1655 } while (id != fanout_next_id);
1656
1657 return false;
1658}
1659
David S. Miller7736d332011-07-05 01:43:20 -07001660static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
David S. Millerdc99f602011-07-05 01:45:05 -07001661{
Eric Dumazetd199fab2017-02-14 09:03:51 -08001662 struct packet_rollover *rollover = NULL;
David S. Millerdc99f602011-07-05 01:45:05 -07001663 struct packet_sock *po = pkt_sk(sk);
1664 struct packet_fanout *f, *match;
David S. Miller7736d332011-07-05 01:43:20 -07001665 u8 type = type_flags & 0xff;
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001666 u8 flags = type_flags >> 8;
David S. Millerdc99f602011-07-05 01:45:05 -07001667 int err;
1668
1669 switch (type) {
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001670 case PACKET_FANOUT_ROLLOVER:
1671 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1672 return -EINVAL;
David S. Millerdc99f602011-07-05 01:45:05 -07001673 case PACKET_FANOUT_HASH:
1674 case PACKET_FANOUT_LB:
David S. Miller95ec3eb2011-07-06 01:56:38 -07001675 case PACKET_FANOUT_CPU:
Daniel Borkmann5df0ddf2013-08-28 22:13:09 +02001676 case PACKET_FANOUT_RND:
Neil Horman2d360972014-01-22 16:01:44 -05001677 case PACKET_FANOUT_QM:
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001678 case PACKET_FANOUT_CBPF:
Willem de Bruijnf2e52092015-08-14 22:31:35 -04001679 case PACKET_FANOUT_EBPF:
David S. Millerdc99f602011-07-05 01:45:05 -07001680 break;
1681 default:
1682 return -EINVAL;
1683 }
1684
Eric Dumazetd199fab2017-02-14 09:03:51 -08001685 mutex_lock(&fanout_mutex);
David S. Millerdc99f602011-07-05 01:45:05 -07001686
Eric Dumazetd199fab2017-02-14 09:03:51 -08001687 err = -EALREADY;
David S. Millerdc99f602011-07-05 01:45:05 -07001688 if (po->fanout)
Eric Dumazetd199fab2017-02-14 09:03:51 -08001689 goto out;
David S. Millerdc99f602011-07-05 01:45:05 -07001690
Willem de Bruijn4633c9e2015-05-17 19:44:02 -04001691 if (type == PACKET_FANOUT_ROLLOVER ||
1692 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
Eric Dumazetd199fab2017-02-14 09:03:51 -08001693 err = -ENOMEM;
1694 rollover = kzalloc(sizeof(*rollover), GFP_KERNEL);
1695 if (!rollover)
1696 goto out;
1697 atomic_long_set(&rollover->num, 0);
1698 atomic_long_set(&rollover->num_huge, 0);
1699 atomic_long_set(&rollover->num_failed, 0);
Willem de Bruijn0648ab72015-05-12 11:56:46 -04001700 }
1701
Mike Maloney4a69a862017-04-21 10:56:11 -04001702 if (type_flags & PACKET_FANOUT_FLAG_UNIQUEID) {
1703 if (id != 0) {
1704 err = -EINVAL;
1705 goto out;
1706 }
1707 if (!fanout_find_new_id(sk, &id)) {
1708 err = -ENOMEM;
1709 goto out;
1710 }
1711 /* ephemeral flag for the first socket in the group: drop it */
1712 flags &= ~(PACKET_FANOUT_FLAG_UNIQUEID >> 8);
1713 }
1714
David S. Millerdc99f602011-07-05 01:45:05 -07001715 match = NULL;
1716 list_for_each_entry(f, &fanout_list, list) {
1717 if (f->id == id &&
1718 read_pnet(&f->net) == sock_net(sk)) {
1719 match = f;
1720 break;
1721 }
1722 }
Eric Dumazetafe62c62011-07-07 06:41:29 -07001723 err = -EINVAL;
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001724 if (match && match->flags != flags)
Eric Dumazetafe62c62011-07-07 06:41:29 -07001725 goto out;
David S. Millerdc99f602011-07-05 01:45:05 -07001726 if (!match) {
Eric Dumazetafe62c62011-07-07 06:41:29 -07001727 err = -ENOMEM;
David S. Millerdc99f602011-07-05 01:45:05 -07001728 match = kzalloc(sizeof(*match), GFP_KERNEL);
Eric Dumazetafe62c62011-07-07 06:41:29 -07001729 if (!match)
1730 goto out;
1731 write_pnet(&match->net, sock_net(sk));
1732 match->id = id;
1733 match->type = type;
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00001734 match->flags = flags;
Eric Dumazetafe62c62011-07-07 06:41:29 -07001735 INIT_LIST_HEAD(&match->list);
1736 spin_lock_init(&match->lock);
Reshetova, Elenafb5c2c12017-06-30 13:08:10 +03001737 refcount_set(&match->sk_ref, 0);
Willem de Bruijn47dceb82015-08-14 22:31:34 -04001738 fanout_init_data(match);
Eric Dumazetafe62c62011-07-07 06:41:29 -07001739 match->prot_hook.type = po->prot_hook.type;
1740 match->prot_hook.dev = po->prot_hook.dev;
1741 match->prot_hook.func = packet_rcv_fanout;
1742 match->prot_hook.af_packet_priv = match;
Eric Leblondc0de08d2012-08-16 22:02:58 +00001743 match->prot_hook.id_match = match_fanout_group;
Eric Dumazetafe62c62011-07-07 06:41:29 -07001744 list_add(&match->list, &fanout_list);
1745 }
1746 err = -EINVAL;
Willem de Bruijn008ba2a2017-09-14 17:14:41 -04001747
1748 spin_lock(&po->bind_lock);
1749 if (po->running &&
1750 match->type == type &&
Eric Dumazetafe62c62011-07-07 06:41:29 -07001751 match->prot_hook.type == po->prot_hook.type &&
1752 match->prot_hook.dev == po->prot_hook.dev) {
1753 err = -ENOSPC;
Reshetova, Elenafb5c2c12017-06-30 13:08:10 +03001754 if (refcount_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
Eric Dumazetafe62c62011-07-07 06:41:29 -07001755 __dev_remove_pack(&po->prot_hook);
1756 po->fanout = match;
Mike Maloney7263f11b2017-11-28 10:44:29 -05001757 po->rollover = rollover;
1758 rollover = NULL;
Reshetova, Elenafb5c2c12017-06-30 13:08:10 +03001759 refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1);
Eric Dumazetafe62c62011-07-07 06:41:29 -07001760 __fanout_link(sk, po);
1761 err = 0;
David S. Millerdc99f602011-07-05 01:45:05 -07001762 }
1763 }
Willem de Bruijn008ba2a2017-09-14 17:14:41 -04001764 spin_unlock(&po->bind_lock);
1765
1766 if (err && !refcount_read(&match->sk_ref)) {
1767 list_del(&match->list);
1768 kfree(match);
1769 }
1770
Eric Dumazetafe62c62011-07-07 06:41:29 -07001771out:
Mike Maloney7263f11b2017-11-28 10:44:29 -05001772 kfree(rollover);
Eric Dumazetd199fab2017-02-14 09:03:51 -08001773 mutex_unlock(&fanout_mutex);
David S. Millerdc99f602011-07-05 01:45:05 -07001774 return err;
1775}
1776
Anoob Soman2bd624b2017-02-15 20:25:39 +00001777/* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes
1778 * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout.
1779 * It is the responsibility of the caller to call fanout_release_data() and
1780 * free the returned packet_fanout (after synchronize_net())
1781 */
1782static struct packet_fanout *fanout_release(struct sock *sk)
David S. Millerdc99f602011-07-05 01:45:05 -07001783{
1784 struct packet_sock *po = pkt_sk(sk);
1785 struct packet_fanout *f;
1786
Pavel Emelyanovfff33212012-08-16 05:36:48 +00001787 mutex_lock(&fanout_mutex);
Eric Dumazetd199fab2017-02-14 09:03:51 -08001788 f = po->fanout;
1789 if (f) {
1790 po->fanout = NULL;
David S. Millerdc99f602011-07-05 01:45:05 -07001791
Reshetova, Elenafb5c2c12017-06-30 13:08:10 +03001792 if (refcount_dec_and_test(&f->sk_ref))
Eric Dumazetd199fab2017-02-14 09:03:51 -08001793 list_del(&f->list);
Anoob Soman2bd624b2017-02-15 20:25:39 +00001794 else
1795 f = NULL;
David S. Millerdc99f602011-07-05 01:45:05 -07001796 }
1797 mutex_unlock(&fanout_mutex);
Anoob Soman2bd624b2017-02-15 20:25:39 +00001798
1799 return f;
David S. Millerdc99f602011-07-05 01:45:05 -07001800}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801
Daniel Borkmann3c70c132015-11-11 23:25:42 +01001802static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1803 struct sk_buff *skb)
1804{
1805 /* Earlier code assumed this would be a VLAN pkt, double-check
1806 * this now that we have the actual packet in hand. We can only
1807 * do this check on Ethernet devices.
1808 */
1809 if (unlikely(dev->type != ARPHRD_ETHER))
1810 return false;
1811
1812 skb_reset_mac_header(skb);
1813 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1814}
1815
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001816static const struct proto_ops packet_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001818static const struct proto_ops packet_ops_spkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001820static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1821 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822{
1823 struct sock *sk;
1824 struct sockaddr_pkt *spkt;
1825
1826 /*
1827 * When we registered the protocol we saved the socket in the data
1828 * field for just this event.
1829 */
1830
1831 sk = pt->af_packet_priv;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001832
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 /*
1834 * Yank back the headers [hope the device set this
1835 * right or kerboom...]
1836 *
1837 * Incoming packets have ll header pulled,
1838 * push it back.
1839 *
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -07001840 * For outgoing ones skb->data == skb_mac_header(skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841 * so that this procedure is noop.
1842 */
1843
1844 if (skb->pkt_type == PACKET_LOOPBACK)
1845 goto out;
1846
Octavian Purdila09ad9bc2009-11-25 15:14:13 -08001847 if (!net_eq(dev_net(dev), sock_net(sk)))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08001848 goto out;
1849
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001850 skb = skb_share_check(skb, GFP_ATOMIC);
1851 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852 goto oom;
1853
1854 /* drop any routing info */
Eric Dumazetadf30902009-06-02 05:19:30 +00001855 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856
Phil Oester84531c22005-07-12 11:57:52 -07001857 /* drop conntrack reference */
1858 nf_reset(skb);
1859
Herbert Xuffbc6112007-02-04 23:33:10 -08001860 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -07001862 skb_push(skb, skb->data - skb_mac_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863
1864 /*
1865 * The SOCK_PACKET socket receives _all_ frames.
1866 */
1867
1868 spkt->spkt_family = dev->type;
1869 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1870 spkt->spkt_protocol = skb->protocol;
1871
1872 /*
1873 * Charge the memory to the socket. This is done specifically
1874 * to prevent sockets using all the memory up.
1875 */
1876
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001877 if (sock_queue_rcv_skb(sk, skb) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 return 0;
1879
1880out:
1881 kfree_skb(skb);
1882oom:
1883 return 0;
1884}
1885
1886
1887/*
1888 * Output a raw packet to a device layer. This bypasses all the other
1889 * protocol layers and you must therefore supply it with a complete frame
1890 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001891
Ying Xue1b784142015-03-02 15:37:48 +08001892static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1893 size_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894{
1895 struct sock *sk = sock->sk;
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001896 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
Eric Dumazet1a35ca82009-12-15 05:47:03 +00001897 struct sk_buff *skb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898 struct net_device *dev;
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -04001899 struct sockcm_cookie sockc;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001900 __be16 proto = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 int err;
Ben Greear3bdc0eb2012-02-11 15:39:30 +00001902 int extra_len = 0;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001903
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001905 * Get and verify the address.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 */
1907
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001908 if (saddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 if (msg->msg_namelen < sizeof(struct sockaddr))
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001910 return -EINVAL;
1911 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1912 proto = saddr->spkt_protocol;
1913 } else
1914 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915
1916 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001917 * Find the device first to size check it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 */
1919
danborkmann@iogearbox.netde74e922012-06-10 08:59:28 +00001920 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
Eric Dumazet1a35ca82009-12-15 05:47:03 +00001921retry:
Eric Dumazet654d1f82009-11-02 10:43:32 +01001922 rcu_read_lock();
1923 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 err = -ENODEV;
1925 if (dev == NULL)
1926 goto out_unlock;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001927
David S. Millerd5e76b02007-01-25 19:30:36 -08001928 err = -ENETDOWN;
1929 if (!(dev->flags & IFF_UP))
1930 goto out_unlock;
1931
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 /*
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001933 * You may not queue a frame bigger than the mtu. This is the lowest level
1934 * raw protocol and you must do your own fragmentation at this level.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001936
Ben Greear3bdc0eb2012-02-11 15:39:30 +00001937 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1938 if (!netif_supports_nofcs(dev)) {
1939 err = -EPROTONOSUPPORT;
1940 goto out_unlock;
1941 }
1942 extra_len = 4; /* We're doing our own CRC */
1943 }
1944
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 err = -EMSGSIZE;
Ben Greear3bdc0eb2012-02-11 15:39:30 +00001946 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 goto out_unlock;
1948
Eric Dumazet1a35ca82009-12-15 05:47:03 +00001949 if (!skb) {
1950 size_t reserved = LL_RESERVED_SPACE(dev);
Herbert Xu4ce40912011-11-18 02:20:05 +00001951 int tlen = dev->needed_tailroom;
Eric Dumazet1a35ca82009-12-15 05:47:03 +00001952 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953
Eric Dumazet1a35ca82009-12-15 05:47:03 +00001954 rcu_read_unlock();
Herbert Xu4ce40912011-11-18 02:20:05 +00001955 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
Eric Dumazet1a35ca82009-12-15 05:47:03 +00001956 if (skb == NULL)
1957 return -ENOBUFS;
1958 /* FIXME: Save some space for broken drivers that write a hard
1959 * header at transmission time by themselves. PPP is the notable
1960 * one here. This should really be fixed at the driver level.
1961 */
1962 skb_reserve(skb, reserved);
1963 skb_reset_network_header(skb);
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001964
Eric Dumazet1a35ca82009-12-15 05:47:03 +00001965 /* Try to align data part correctly */
1966 if (hhlen) {
1967 skb->data -= hhlen;
1968 skb->tail -= hhlen;
1969 if (len < hhlen)
1970 skb_reset_network_header(skb);
1971 }
Al Viro6ce8e9c2014-04-06 21:25:44 -04001972 err = memcpy_from_msg(skb_put(skb, len), msg, len);
Eric Dumazet1a35ca82009-12-15 05:47:03 +00001973 if (err)
1974 goto out_free;
1975 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 }
1977
Willem de Bruijn9ed988c2016-03-09 21:58:34 -05001978 if (!dev_validate_header(dev, skb->data, len)) {
1979 err = -EINVAL;
1980 goto out_unlock;
1981 }
Daniel Borkmann3c70c132015-11-11 23:25:42 +01001982 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1983 !packet_extra_vlan_len_allowed(dev, skb)) {
1984 err = -EMSGSIZE;
1985 goto out_unlock;
Ben Greear57f89bf2011-02-11 09:35:18 +00001986 }
Eric Dumazet1a35ca82009-12-15 05:47:03 +00001987
Yoshihiro Shimodaedbe7742016-07-19 14:40:51 +09001988 sockc.tsflags = sk->sk_tsflags;
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -04001989 if (msg->msg_controllen) {
1990 err = sock_cmsg_send(sk, msg, &sockc);
Soheil Hassas Yeganehf8e77182016-07-20 18:01:18 -04001991 if (unlikely(err))
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -04001992 goto out_unlock;
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -04001993 }
1994
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 skb->protocol = proto;
1996 skb->dev = dev;
1997 skb->priority = sk->sk_priority;
Eric Dumazet2d37a182009-10-01 19:14:46 +00001998 skb->mark = sk->sk_mark;
Daniel Borkmannbf84a012013-04-14 08:08:13 +00001999
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -04002000 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001
Ben Greear3bdc0eb2012-02-11 15:39:30 +00002002 if (unlikely(extra_len == 4))
2003 skb->no_fcs = 1;
2004
Jason Wang40893fd2013-03-26 23:11:22 +00002005 skb_probe_transport_header(skb, 0);
Jason Wangc1aad272013-03-25 20:19:57 +00002006
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007 dev_queue_xmit(skb);
Eric Dumazet654d1f82009-11-02 10:43:32 +01002008 rcu_read_unlock();
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002009 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011out_unlock:
Eric Dumazet654d1f82009-11-02 10:43:32 +01002012 rcu_read_unlock();
Eric Dumazet1a35ca82009-12-15 05:47:03 +00002013out_free:
2014 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015 return err;
2016}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017
Alexei Starovoitovff936a02015-10-07 10:55:41 -07002018static unsigned int run_filter(struct sk_buff *skb,
2019 const struct sock *sk,
2020 unsigned int res)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021{
2022 struct sk_filter *filter;
2023
Eric Dumazet80f8f102011-01-18 07:46:52 +00002024 rcu_read_lock();
2025 filter = rcu_dereference(sk->sk_filter);
David S. Millerdbcb5852007-01-24 15:21:02 -08002026 if (filter != NULL)
Alexei Starovoitovff936a02015-10-07 10:55:41 -07002027 res = bpf_prog_run_clear_cb(filter->prog, skb);
Eric Dumazet80f8f102011-01-18 07:46:52 +00002028 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029
David S. Millerdbcb5852007-01-24 15:21:02 -08002030 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031}
2032
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002033static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
2034 size_t *len)
2035{
2036 struct virtio_net_hdr vnet_hdr;
2037
2038 if (*len < sizeof(vnet_hdr))
2039 return -EINVAL;
2040 *len -= sizeof(vnet_hdr);
2041
Jason Wang6391a442017-01-20 14:32:42 +08002042 if (virtio_net_hdr_from_skb(skb, &vnet_hdr, vio_le(), true))
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002043 return -EINVAL;
2044
2045 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
2046}
2047
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048/*
Eric Dumazet62ab0812010-12-06 20:50:09 +00002049 * This function makes lazy skb cloning in hope that most of packets
2050 * are discarded by BPF.
2051 *
2052 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2053 * and skb->cb are mangled. It works because (and until) packets
2054 * falling here are owned by current CPU. Output packets are cloned
2055 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2056 * sequencially, so that if we return skb to original state on exit,
2057 * we will not harm anyone.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058 */
2059
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002060static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2061 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062{
2063 struct sock *sk;
2064 struct sockaddr_ll *sll;
2065 struct packet_sock *po;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002066 u8 *skb_head = skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067 int skb_len = skb->len;
David S. Millerdbcb5852007-01-24 15:21:02 -08002068 unsigned int snaplen, res;
Weongyo Jeongda378452016-04-14 14:10:04 -07002069 bool is_drop_n_account = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070
2071 if (skb->pkt_type == PACKET_LOOPBACK)
2072 goto drop;
2073
2074 sk = pt->af_packet_priv;
2075 po = pkt_sk(sk);
2076
Octavian Purdila09ad9bc2009-11-25 15:14:13 -08002077 if (!net_eq(dev_net(dev), sock_net(sk)))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002078 goto drop;
2079
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080 skb->dev = dev;
2081
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -07002082 if (dev->header_ops) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083 /* The device has an explicit notion of ll header,
Eric Dumazet62ab0812010-12-06 20:50:09 +00002084 * exported to higher levels.
2085 *
2086 * Otherwise, the device hides details of its frame
2087 * structure, so that corresponding packet head is
2088 * never delivered to user.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 */
2090 if (sk->sk_type != SOCK_DGRAM)
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -07002091 skb_push(skb, skb->data - skb_mac_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092 else if (skb->pkt_type == PACKET_OUTGOING) {
2093 /* Special case: outgoing packets have ll header at head */
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -03002094 skb_pull(skb, skb_network_offset(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 }
2096 }
2097
2098 snaplen = skb->len;
2099
David S. Millerdbcb5852007-01-24 15:21:02 -08002100 res = run_filter(skb, sk, snaplen);
2101 if (!res)
Dmitry Mishinfda9ef52006-08-31 15:28:39 -07002102 goto drop_n_restore;
David S. Millerdbcb5852007-01-24 15:21:02 -08002103 if (snaplen > res)
2104 snaplen = res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105
Eric Dumazet0fd7bac2011-12-21 07:11:44 +00002106 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107 goto drop_n_acct;
2108
2109 if (skb_shared(skb)) {
2110 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2111 if (nskb == NULL)
2112 goto drop_n_acct;
2113
2114 if (skb_head != skb->data) {
2115 skb->data = skb_head;
2116 skb->len = skb_len;
2117 }
Eric Dumazetabc4e4f2012-04-19 02:24:42 +00002118 consume_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119 skb = nskb;
2120 }
2121
Eyal Birgerb4772ef2015-03-01 14:58:29 +02002122 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
Herbert Xuffbc6112007-02-04 23:33:10 -08002123
2124 sll = &PACKET_SKB_CB(skb)->sa.ll;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002125 sll->sll_hatype = dev->type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126 sll->sll_pkttype = skb->pkt_type;
Peter P Waskiewicz Jr8032b462007-11-10 22:03:25 -08002127 if (unlikely(po->origdev))
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -07002128 sll->sll_ifindex = orig_dev->ifindex;
2129 else
2130 sll->sll_ifindex = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131
Stephen Hemmingerb95cce32007-09-26 22:13:38 -07002132 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133
Eyal Birger2472d762015-03-01 14:58:28 +02002134 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2135 * Use their space for storing the original skb length.
2136 */
2137 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
Herbert Xu8dc41942007-02-04 23:31:32 -08002138
Linus Torvalds1da177e2005-04-16 15:20:36 -07002139 if (pskb_trim(skb, snaplen))
2140 goto drop_n_acct;
2141
2142 skb_set_owner_r(skb, sk);
2143 skb->dev = NULL;
Eric Dumazetadf30902009-06-02 05:19:30 +00002144 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145
Phil Oester84531c22005-07-12 11:57:52 -07002146 /* drop conntrack reference */
2147 nf_reset(skb);
2148
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 spin_lock(&sk->sk_receive_queue.lock);
Daniel Borkmannee80fbf2013-04-19 06:12:29 +00002150 po->stats.stats1.tp_packets++;
Eyal Birger3bc3b962015-03-01 14:58:30 +02002151 sock_skb_set_dropcount(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152 __skb_queue_tail(&sk->sk_receive_queue, skb);
2153 spin_unlock(&sk->sk_receive_queue.lock);
David S. Miller676d2362014-04-11 16:15:36 -04002154 sk->sk_data_ready(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155 return 0;
2156
2157drop_n_acct:
Weongyo Jeongda378452016-04-14 14:10:04 -07002158 is_drop_n_account = true;
Willem de Bruijn7091fbd2011-09-30 10:38:28 +00002159 spin_lock(&sk->sk_receive_queue.lock);
Daniel Borkmannee80fbf2013-04-19 06:12:29 +00002160 po->stats.stats1.tp_drops++;
Willem de Bruijn7091fbd2011-09-30 10:38:28 +00002161 atomic_inc(&sk->sk_drops);
2162 spin_unlock(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002163
2164drop_n_restore:
2165 if (skb_head != skb->data && skb_shared(skb)) {
2166 skb->data = skb_head;
2167 skb->len = skb_len;
2168 }
2169drop:
Weongyo Jeongda378452016-04-14 14:10:04 -07002170 if (!is_drop_n_account)
2171 consume_skb(skb);
2172 else
2173 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002174 return 0;
2175}
2176
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002177static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2178 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002179{
2180 struct sock *sk;
2181 struct packet_sock *po;
2182 struct sockaddr_ll *sll;
Daniel Borkmann184f4892013-04-16 01:57:46 +00002183 union tpacket_uhdr h;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002184 u8 *skb_head = skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002185 int skb_len = skb->len;
David S. Millerdbcb5852007-01-24 15:21:02 -08002186 unsigned int snaplen, res;
chetan lokef6fb8f102011-08-19 10:18:16 +00002187 unsigned long status = TP_STATUS_USER;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002188 unsigned short macoff, netoff, hdrlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002189 struct sk_buff *copy_skb = NULL;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002190 struct timespec ts;
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +00002191 __u32 ts_status;
Weongyo Jeongda378452016-04-14 14:10:04 -07002192 bool is_drop_n_account = false;
Benjamin Poirieredbd58b2017-08-28 14:29:41 -04002193 bool do_vnet = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194
Atzm Watanabe51846352013-12-17 22:53:32 +09002195 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2196 * We may add members to them until current aligned size without forcing
2197 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2198 */
2199 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2200 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2201
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202 if (skb->pkt_type == PACKET_LOOPBACK)
2203 goto drop;
2204
2205 sk = pt->af_packet_priv;
2206 po = pkt_sk(sk);
2207
Octavian Purdila09ad9bc2009-11-25 15:14:13 -08002208 if (!net_eq(dev_net(dev), sock_net(sk)))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002209 goto drop;
2210
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -07002211 if (dev->header_ops) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002212 if (sk->sk_type != SOCK_DGRAM)
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -07002213 skb_push(skb, skb->data - skb_mac_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214 else if (skb->pkt_type == PACKET_OUTGOING) {
2215 /* Special case: outgoing packets have ll header at head */
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -03002216 skb_pull(skb, skb_network_offset(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217 }
2218 }
2219
2220 snaplen = skb->len;
2221
David S. Millerdbcb5852007-01-24 15:21:02 -08002222 res = run_filter(skb, sk, snaplen);
2223 if (!res)
Dmitry Mishinfda9ef52006-08-31 15:28:39 -07002224 goto drop_n_restore;
Alexander Drozdov68c2e5d2015-03-23 09:11:12 +03002225
2226 if (skb->ip_summed == CHECKSUM_PARTIAL)
2227 status |= TP_STATUS_CSUMNOTREADY;
Alexander Drozdov682f0482015-03-23 09:11:13 +03002228 else if (skb->pkt_type != PACKET_OUTGOING &&
2229 (skb->ip_summed == CHECKSUM_COMPLETE ||
2230 skb_csum_unnecessary(skb)))
2231 status |= TP_STATUS_CSUM_VALID;
Alexander Drozdov68c2e5d2015-03-23 09:11:12 +03002232
David S. Millerdbcb5852007-01-24 15:21:02 -08002233 if (snaplen > res)
2234 snaplen = res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235
2236 if (sk->sk_type == SOCK_DGRAM) {
Patrick McHardy8913336a2008-07-18 18:05:19 -07002237 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2238 po->tp_reserve;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002239 } else {
Eric Dumazet95c96172012-04-15 05:58:06 +00002240 unsigned int maclen = skb_network_offset(skb);
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002241 netoff = TPACKET_ALIGN(po->tp_hdrlen +
Patrick McHardy8913336a2008-07-18 18:05:19 -07002242 (maclen < 16 ? 16 : maclen)) +
Willem de Bruijn58d19b12016-02-03 18:02:15 -05002243 po->tp_reserve;
Benjamin Poirieredbd58b2017-08-28 14:29:41 -04002244 if (po->has_vnet_hdr) {
Willem de Bruijn58d19b12016-02-03 18:02:15 -05002245 netoff += sizeof(struct virtio_net_hdr);
Benjamin Poirieredbd58b2017-08-28 14:29:41 -04002246 do_vnet = true;
2247 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 macoff = netoff - maclen;
2249 }
chetan lokef6fb8f102011-08-19 10:18:16 +00002250 if (po->tp_version <= TPACKET_V2) {
2251 if (macoff + snaplen > po->rx_ring.frame_size) {
2252 if (po->copy_thresh &&
Eric Dumazet0fd7bac2011-12-21 07:11:44 +00002253 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
chetan lokef6fb8f102011-08-19 10:18:16 +00002254 if (skb_shared(skb)) {
2255 copy_skb = skb_clone(skb, GFP_ATOMIC);
2256 } else {
2257 copy_skb = skb_get(skb);
2258 skb_head = skb->data;
2259 }
2260 if (copy_skb)
2261 skb_set_owner_r(copy_skb, sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262 }
chetan lokef6fb8f102011-08-19 10:18:16 +00002263 snaplen = po->rx_ring.frame_size - macoff;
Benjamin Poirieredbd58b2017-08-28 14:29:41 -04002264 if ((int)snaplen < 0) {
chetan lokef6fb8f102011-08-19 10:18:16 +00002265 snaplen = 0;
Benjamin Poirieredbd58b2017-08-28 14:29:41 -04002266 do_vnet = false;
2267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002268 }
Eric Dumazetdc808112014-08-15 09:16:04 -07002269 } else if (unlikely(macoff + snaplen >
2270 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2271 u32 nval;
2272
2273 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2274 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2275 snaplen, nval, macoff);
2276 snaplen = nval;
2277 if (unlikely((int)snaplen < 0)) {
2278 snaplen = 0;
2279 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
Benjamin Poirieredbd58b2017-08-28 14:29:41 -04002280 do_vnet = false;
Eric Dumazetdc808112014-08-15 09:16:04 -07002281 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283 spin_lock(&sk->sk_receive_queue.lock);
chetan lokef6fb8f102011-08-19 10:18:16 +00002284 h.raw = packet_current_rx_frame(po, skb,
2285 TP_STATUS_KERNEL, (macoff+snaplen));
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002286 if (!h.raw)
Willem de Bruijn58d19b12016-02-03 18:02:15 -05002287 goto drop_n_account;
chetan lokef6fb8f102011-08-19 10:18:16 +00002288 if (po->tp_version <= TPACKET_V2) {
2289 packet_increment_rx_head(po, &po->rx_ring);
2290 /*
2291 * LOSING will be reported till you read the stats,
2292 * because it's COR - Clear On Read.
2293 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2294 * at packet level.
2295 */
Daniel Borkmannee80fbf2013-04-19 06:12:29 +00002296 if (po->stats.stats1.tp_drops)
chetan lokef6fb8f102011-08-19 10:18:16 +00002297 status |= TP_STATUS_LOSING;
2298 }
Daniel Borkmannee80fbf2013-04-19 06:12:29 +00002299 po->stats.stats1.tp_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002300 if (copy_skb) {
2301 status |= TP_STATUS_COPY;
2302 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2303 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002304 spin_unlock(&sk->sk_receive_queue.lock);
2305
Benjamin Poirieredbd58b2017-08-28 14:29:41 -04002306 if (do_vnet) {
Jarno Rajahalme5a213882016-11-18 15:40:42 -08002307 if (virtio_net_hdr_from_skb(skb, h.raw + macoff -
2308 sizeof(struct virtio_net_hdr),
Jason Wang6391a442017-01-20 14:32:42 +08002309 vio_le(), true)) {
Willem de Bruijn58d19b12016-02-03 18:02:15 -05002310 spin_lock(&sk->sk_receive_queue.lock);
2311 goto drop_n_account;
2312 }
2313 }
2314
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002315 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +00002316
2317 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
Daniel Borkmann7a513842013-04-23 00:39:29 +00002318 getnstimeofday(&ts);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +00002320 status |= ts_status;
2321
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002322 switch (po->tp_version) {
2323 case TPACKET_V1:
2324 h.h1->tp_len = skb->len;
2325 h.h1->tp_snaplen = snaplen;
2326 h.h1->tp_mac = macoff;
2327 h.h1->tp_net = netoff;
Daniel Borkmann4b457bd2013-04-16 01:29:11 +00002328 h.h1->tp_sec = ts.tv_sec;
2329 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002330 hdrlen = sizeof(*h.h1);
2331 break;
2332 case TPACKET_V2:
2333 h.h2->tp_len = skb->len;
2334 h.h2->tp_snaplen = snaplen;
2335 h.h2->tp_mac = macoff;
2336 h.h2->tp_net = netoff;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002337 h.h2->tp_sec = ts.tv_sec;
2338 h.h2->tp_nsec = ts.tv_nsec;
Jiri Pirkodf8a39d2015-01-13 17:13:44 +01002339 if (skb_vlan_tag_present(skb)) {
2340 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
Atzm Watanabea0cdfcf2013-12-17 22:53:40 +09002341 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2342 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
Ben Greeara3bcc232011-06-01 06:49:10 +00002343 } else {
2344 h.h2->tp_vlan_tci = 0;
Atzm Watanabea0cdfcf2013-12-17 22:53:40 +09002345 h.h2->tp_vlan_tpid = 0;
Ben Greeara3bcc232011-06-01 06:49:10 +00002346 }
Atzm Watanabee4d26f42013-12-17 22:53:36 +09002347 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002348 hdrlen = sizeof(*h.h2);
2349 break;
chetan lokef6fb8f102011-08-19 10:18:16 +00002350 case TPACKET_V3:
2351 /* tp_nxt_offset,vlan are already populated above.
2352 * So DONT clear those fields here
2353 */
2354 h.h3->tp_status |= status;
2355 h.h3->tp_len = skb->len;
2356 h.h3->tp_snaplen = snaplen;
2357 h.h3->tp_mac = macoff;
2358 h.h3->tp_net = netoff;
chetan lokef6fb8f102011-08-19 10:18:16 +00002359 h.h3->tp_sec = ts.tv_sec;
2360 h.h3->tp_nsec = ts.tv_nsec;
Atzm Watanabee4d26f42013-12-17 22:53:36 +09002361 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
chetan lokef6fb8f102011-08-19 10:18:16 +00002362 hdrlen = sizeof(*h.h3);
2363 break;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002364 default:
2365 BUG();
2366 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002368 sll = h.raw + TPACKET_ALIGN(hdrlen);
Stephen Hemmingerb95cce32007-09-26 22:13:38 -07002369 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002370 sll->sll_family = AF_PACKET;
2371 sll->sll_hatype = dev->type;
2372 sll->sll_protocol = skb->protocol;
2373 sll->sll_pkttype = skb->pkt_type;
Peter P Waskiewicz Jr8032b462007-11-10 22:03:25 -08002374 if (unlikely(po->origdev))
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -07002375 sll->sll_ifindex = orig_dev->ifindex;
2376 else
2377 sll->sll_ifindex = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378
Ralf Baechlee16aa202006-12-07 00:11:33 -08002379 smp_mb();
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01002380
Changli Gaof6dafa92010-12-07 04:26:16 +00002381#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01002382 if (po->tp_version <= TPACKET_V2) {
Changli Gao0af55bb2010-12-01 02:52:20 +00002383 u8 *start, *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01002385 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2386 macoff + snaplen);
2387
2388 for (start = h.raw; start < end; start += PAGE_SIZE)
2389 flush_dcache_page(pgv_to_page(start));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390 }
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01002391 smp_wmb();
Changli Gaof6dafa92010-12-07 04:26:16 +00002392#endif
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01002393
Dan Collinsda413ee2014-12-19 16:49:25 +13002394 if (po->tp_version <= TPACKET_V2) {
chetan lokef6fb8f102011-08-19 10:18:16 +00002395 __packet_set_status(po, h.raw, status);
Dan Collinsda413ee2014-12-19 16:49:25 +13002396 sk->sk_data_ready(sk);
2397 } else {
chetan lokef6fb8f102011-08-19 10:18:16 +00002398 prb_clear_blk_fill_status(&po->rx_ring);
Dan Collinsda413ee2014-12-19 16:49:25 +13002399 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002400
2401drop_n_restore:
2402 if (skb_head != skb->data && skb_shared(skb)) {
2403 skb->data = skb_head;
2404 skb->len = skb_len;
2405 }
2406drop:
Weongyo Jeongda378452016-04-14 14:10:04 -07002407 if (!is_drop_n_account)
2408 consume_skb(skb);
2409 else
2410 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411 return 0;
2412
Willem de Bruijn58d19b12016-02-03 18:02:15 -05002413drop_n_account:
Weongyo Jeongda378452016-04-14 14:10:04 -07002414 is_drop_n_account = true;
Daniel Borkmannee80fbf2013-04-19 06:12:29 +00002415 po->stats.stats1.tp_drops++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002416 spin_unlock(&sk->sk_receive_queue.lock);
2417
David S. Miller676d2362014-04-11 16:15:36 -04002418 sk->sk_data_ready(sk);
Wei Yongjunacb5d752009-02-25 00:36:42 +00002419 kfree_skb(copy_skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002420 goto drop_n_restore;
2421}
2422
Johann Baudy69e3c752009-05-18 22:11:22 -07002423static void tpacket_destruct_skb(struct sk_buff *skb)
2424{
2425 struct packet_sock *po = pkt_sk(skb->sk);
Johann Baudy69e3c752009-05-18 22:11:22 -07002426
Johann Baudy69e3c752009-05-18 22:11:22 -07002427 if (likely(po->tx_ring.pg_vec)) {
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01002428 void *ph;
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +00002429 __u32 ts;
2430
Johann Baudy69e3c752009-05-18 22:11:22 -07002431 ph = skb_shinfo(skb)->destructor_arg;
Daniel Borkmannb0138402014-01-15 16:25:36 +01002432 packet_dec_pending(&po->tx_ring);
Daniel Borkmannb9c32fb2013-04-23 00:39:31 +00002433
2434 ts = __packet_set_timestamp(po, ph, skb);
2435 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
Johann Baudy69e3c752009-05-18 22:11:22 -07002436 }
2437
2438 sock_wfree(skb);
2439}
2440
Daniel Borkmannc72219b2015-11-11 23:25:43 +01002441static void tpacket_set_protocol(const struct net_device *dev,
2442 struct sk_buff *skb)
2443{
2444 if (dev->type == ARPHRD_ETHER) {
2445 skb_reset_mac_header(skb);
2446 skb->protocol = eth_hdr(skb)->h_proto;
2447 }
2448}
2449
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002450static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2451{
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002452 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2453 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2454 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2455 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2456 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2457 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2458 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2459
2460 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2461 return -EINVAL;
2462
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002463 return 0;
2464}
2465
2466static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2467 struct virtio_net_hdr *vnet_hdr)
2468{
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002469 if (*len < sizeof(*vnet_hdr))
2470 return -EINVAL;
2471 *len -= sizeof(*vnet_hdr);
2472
Al Virocbbd26b2016-11-01 22:09:04 -04002473 if (!copy_from_iter_full(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter))
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002474 return -EFAULT;
2475
2476 return __packet_snd_vnet_parse(vnet_hdr, *len);
2477}
2478
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002479static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
Willem de Bruijn8d39b4a2016-02-03 18:02:16 -05002480 void *frame, struct net_device *dev, void *data, int tp_len,
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -04002481 __be16 proto, unsigned char *addr, int hlen, int copylen,
2482 const struct sockcm_cookie *sockc)
Johann Baudy69e3c752009-05-18 22:11:22 -07002483{
Daniel Borkmann184f4892013-04-16 01:57:46 +00002484 union tpacket_uhdr ph;
Willem de Bruijn8d39b4a2016-02-03 18:02:16 -05002485 int to_write, offset, len, nr_frags, len_max;
Johann Baudy69e3c752009-05-18 22:11:22 -07002486 struct socket *sock = po->sk.sk_socket;
2487 struct page *page;
Johann Baudy69e3c752009-05-18 22:11:22 -07002488 int err;
2489
2490 ph.raw = frame;
2491
2492 skb->protocol = proto;
2493 skb->dev = dev;
2494 skb->priority = po->sk.sk_priority;
Eric Dumazet2d37a182009-10-01 19:14:46 +00002495 skb->mark = po->sk.sk_mark;
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -04002496 sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
Johann Baudy69e3c752009-05-18 22:11:22 -07002497 skb_shinfo(skb)->destructor_arg = ph.raw;
2498
Herbert Xuae641942011-11-18 02:20:04 +00002499 skb_reserve(skb, hlen);
Johann Baudy69e3c752009-05-18 22:11:22 -07002500 skb_reset_network_header(skb);
Jason Wangc1aad272013-03-25 20:19:57 +00002501
Johann Baudy69e3c752009-05-18 22:11:22 -07002502 to_write = tp_len;
2503
2504 if (sock->type == SOCK_DGRAM) {
2505 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2506 NULL, tp_len);
2507 if (unlikely(err < 0))
2508 return -EINVAL;
Willem de Bruijn1d036d22016-02-03 18:02:17 -05002509 } else if (copylen) {
Willem de Bruijn9ed988c2016-03-09 21:58:34 -05002510 int hdrlen = min_t(int, copylen, tp_len);
2511
Johann Baudy69e3c752009-05-18 22:11:22 -07002512 skb_push(skb, dev->hard_header_len);
Willem de Bruijn1d036d22016-02-03 18:02:17 -05002513 skb_put(skb, copylen - dev->hard_header_len);
Willem de Bruijn9ed988c2016-03-09 21:58:34 -05002514 err = skb_store_bits(skb, 0, data, hdrlen);
Johann Baudy69e3c752009-05-18 22:11:22 -07002515 if (unlikely(err))
2516 return err;
Willem de Bruijn9ed988c2016-03-09 21:58:34 -05002517 if (!dev_validate_header(dev, skb->data, hdrlen))
2518 return -EINVAL;
Daniel Borkmannc72219b2015-11-11 23:25:43 +01002519 if (!skb->protocol)
2520 tpacket_set_protocol(dev, skb);
Johann Baudy69e3c752009-05-18 22:11:22 -07002521
Willem de Bruijn9ed988c2016-03-09 21:58:34 -05002522 data += hdrlen;
2523 to_write -= hdrlen;
Johann Baudy69e3c752009-05-18 22:11:22 -07002524 }
2525
Johann Baudy69e3c752009-05-18 22:11:22 -07002526 offset = offset_in_page(data);
2527 len_max = PAGE_SIZE - offset;
2528 len = ((to_write > len_max) ? len_max : to_write);
2529
2530 skb->data_len = to_write;
2531 skb->len += to_write;
2532 skb->truesize += to_write;
Reshetova, Elena14afee42017-06-30 13:08:00 +03002533 refcount_add(to_write, &po->sk.sk_wmem_alloc);
Johann Baudy69e3c752009-05-18 22:11:22 -07002534
2535 while (likely(to_write)) {
2536 nr_frags = skb_shinfo(skb)->nr_frags;
2537
2538 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002539 pr_err("Packet exceed the number of skb frags(%lu)\n",
2540 MAX_SKB_FRAGS);
Johann Baudy69e3c752009-05-18 22:11:22 -07002541 return -EFAULT;
2542 }
2543
Changli Gao0af55bb2010-12-01 02:52:20 +00002544 page = pgv_to_page(data);
2545 data += len;
Johann Baudy69e3c752009-05-18 22:11:22 -07002546 flush_dcache_page(page);
2547 get_page(page);
Changli Gao0af55bb2010-12-01 02:52:20 +00002548 skb_fill_page_desc(skb, nr_frags, page, offset, len);
Johann Baudy69e3c752009-05-18 22:11:22 -07002549 to_write -= len;
2550 offset = 0;
2551 len_max = PAGE_SIZE;
2552 len = ((to_write > len_max) ? len_max : to_write);
2553 }
2554
Daniel Borkmann8fd6c802015-11-11 23:25:41 +01002555 skb_probe_transport_header(skb, 0);
Daniel Borkmannefdfa2f2015-11-11 23:25:40 +01002556
Johann Baudy69e3c752009-05-18 22:11:22 -07002557 return tp_len;
2558}
2559
Willem de Bruijn8d39b4a2016-02-03 18:02:16 -05002560static int tpacket_parse_header(struct packet_sock *po, void *frame,
2561 int size_max, void **data)
2562{
2563 union tpacket_uhdr ph;
2564 int tp_len, off;
2565
2566 ph.raw = frame;
2567
2568 switch (po->tp_version) {
Sowmini Varadhan7f953ab2017-01-03 06:31:47 -08002569 case TPACKET_V3:
2570 if (ph.h3->tp_next_offset != 0) {
2571 pr_warn_once("variable sized slot not supported");
2572 return -EINVAL;
2573 }
2574 tp_len = ph.h3->tp_len;
2575 break;
Willem de Bruijn8d39b4a2016-02-03 18:02:16 -05002576 case TPACKET_V2:
2577 tp_len = ph.h2->tp_len;
2578 break;
2579 default:
2580 tp_len = ph.h1->tp_len;
2581 break;
2582 }
2583 if (unlikely(tp_len > size_max)) {
2584 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2585 return -EMSGSIZE;
2586 }
2587
2588 if (unlikely(po->tp_tx_has_off)) {
2589 int off_min, off_max;
2590
2591 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2592 off_max = po->tx_ring.frame_size - tp_len;
2593 if (po->sk.sk_type == SOCK_DGRAM) {
2594 switch (po->tp_version) {
Sowmini Varadhan7f953ab2017-01-03 06:31:47 -08002595 case TPACKET_V3:
2596 off = ph.h3->tp_net;
2597 break;
Willem de Bruijn8d39b4a2016-02-03 18:02:16 -05002598 case TPACKET_V2:
2599 off = ph.h2->tp_net;
2600 break;
2601 default:
2602 off = ph.h1->tp_net;
2603 break;
2604 }
2605 } else {
2606 switch (po->tp_version) {
Sowmini Varadhan7f953ab2017-01-03 06:31:47 -08002607 case TPACKET_V3:
2608 off = ph.h3->tp_mac;
2609 break;
Willem de Bruijn8d39b4a2016-02-03 18:02:16 -05002610 case TPACKET_V2:
2611 off = ph.h2->tp_mac;
2612 break;
2613 default:
2614 off = ph.h1->tp_mac;
2615 break;
2616 }
2617 }
2618 if (unlikely((off < off_min) || (off_max < off)))
2619 return -EINVAL;
2620 } else {
2621 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2622 }
2623
2624 *data = frame + off;
2625 return tp_len;
2626}
2627
Johann Baudy69e3c752009-05-18 22:11:22 -07002628static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2629{
Johann Baudy69e3c752009-05-18 22:11:22 -07002630 struct sk_buff *skb;
2631 struct net_device *dev;
Willem de Bruijn1d036d22016-02-03 18:02:17 -05002632 struct virtio_net_hdr *vnet_hdr = NULL;
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -04002633 struct sockcm_cookie sockc;
Johann Baudy69e3c752009-05-18 22:11:22 -07002634 __be16 proto;
David S. Miller09effa62013-08-07 17:11:00 -07002635 int err, reserve = 0;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002636 void *ph;
Steffen Hurrle342dfc32014-01-17 22:53:15 +01002637 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
Daniel Borkmann87a2fd22014-01-15 16:25:35 +01002638 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
Johann Baudy69e3c752009-05-18 22:11:22 -07002639 int tp_len, size_max;
2640 unsigned char *addr;
Willem de Bruijn8d39b4a2016-02-03 18:02:16 -05002641 void *data;
Johann Baudy69e3c752009-05-18 22:11:22 -07002642 int len_sum = 0;
danborkmann@iogearbox.net9e670302012-08-20 03:34:03 +00002643 int status = TP_STATUS_AVAILABLE;
Willem de Bruijn1d036d22016-02-03 18:02:17 -05002644 int hlen, tlen, copylen = 0;
Johann Baudy69e3c752009-05-18 22:11:22 -07002645
Johann Baudy69e3c752009-05-18 22:11:22 -07002646 mutex_lock(&po->pg_vec_lock);
2647
Daniel Borkmann66e56cd2013-12-06 11:36:15 +01002648 if (likely(saddr == NULL)) {
Daniel Borkmanne40526c2013-11-21 16:50:58 +01002649 dev = packet_cached_dev_get(po);
Johann Baudy69e3c752009-05-18 22:11:22 -07002650 proto = po->num;
2651 addr = NULL;
2652 } else {
2653 err = -EINVAL;
2654 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2655 goto out;
2656 if (msg->msg_namelen < (saddr->sll_halen
2657 + offsetof(struct sockaddr_ll,
2658 sll_addr)))
2659 goto out;
Johann Baudy69e3c752009-05-18 22:11:22 -07002660 proto = saddr->sll_protocol;
2661 addr = saddr->sll_addr;
Ben Greear827d9782011-06-01 07:18:53 +00002662 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
Johann Baudy69e3c752009-05-18 22:11:22 -07002663 }
2664
Johann Baudy69e3c752009-05-18 22:11:22 -07002665 err = -ENXIO;
2666 if (unlikely(dev == NULL))
2667 goto out;
Johann Baudy69e3c752009-05-18 22:11:22 -07002668 err = -ENETDOWN;
2669 if (unlikely(!(dev->flags & IFF_UP)))
2670 goto out_put;
2671
Douglas Caetano dos Santosd19b1832017-05-12 15:19:15 -03002672 sockc.tsflags = po->sk.sk_tsflags;
2673 if (msg->msg_controllen) {
2674 err = sock_cmsg_send(&po->sk, msg, &sockc);
2675 if (unlikely(err))
2676 goto out_put;
2677 }
2678
Daniel Borkmann5cfb4c82015-11-11 23:25:44 +01002679 if (po->sk.sk_socket->type == SOCK_RAW)
2680 reserve = dev->hard_header_len;
Johann Baudy69e3c752009-05-18 22:11:22 -07002681 size_max = po->tx_ring.frame_size
Gabor Gombasb5dd8842009-10-29 03:19:11 -07002682 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
Johann Baudy69e3c752009-05-18 22:11:22 -07002683
Willem de Bruijn1d036d22016-02-03 18:02:17 -05002684 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
Daniel Borkmann5cfb4c82015-11-11 23:25:44 +01002685 size_max = dev->mtu + reserve + VLAN_HLEN;
David S. Miller09effa62013-08-07 17:11:00 -07002686
Johann Baudy69e3c752009-05-18 22:11:22 -07002687 do {
2688 ph = packet_current_frame(po, &po->tx_ring,
Daniel Borkmann87a2fd22014-01-15 16:25:35 +01002689 TP_STATUS_SEND_REQUEST);
Johann Baudy69e3c752009-05-18 22:11:22 -07002690 if (unlikely(ph == NULL)) {
Daniel Borkmann87a2fd22014-01-15 16:25:35 +01002691 if (need_wait && need_resched())
2692 schedule();
Johann Baudy69e3c752009-05-18 22:11:22 -07002693 continue;
2694 }
2695
Willem de Bruijn8d39b4a2016-02-03 18:02:16 -05002696 skb = NULL;
2697 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2698 if (tp_len < 0)
2699 goto tpacket_error;
2700
Johann Baudy69e3c752009-05-18 22:11:22 -07002701 status = TP_STATUS_SEND_REQUEST;
Herbert Xuae641942011-11-18 02:20:04 +00002702 hlen = LL_RESERVED_SPACE(dev);
2703 tlen = dev->needed_tailroom;
Willem de Bruijn1d036d22016-02-03 18:02:17 -05002704 if (po->has_vnet_hdr) {
2705 vnet_hdr = data;
2706 data += sizeof(*vnet_hdr);
2707 tp_len -= sizeof(*vnet_hdr);
2708 if (tp_len < 0 ||
2709 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2710 tp_len = -EINVAL;
2711 goto tpacket_error;
2712 }
2713 copylen = __virtio16_to_cpu(vio_le(),
2714 vnet_hdr->hdr_len);
2715 }
Willem de Bruijn9ed988c2016-03-09 21:58:34 -05002716 copylen = max_t(int, copylen, dev->hard_header_len);
Johann Baudy69e3c752009-05-18 22:11:22 -07002717 skb = sock_alloc_send_skb(&po->sk,
Willem de Bruijn1d036d22016-02-03 18:02:17 -05002718 hlen + tlen + sizeof(struct sockaddr_ll) +
2719 (copylen - dev->hard_header_len),
Kretschmer, Mathiasfbf33a22015-05-08 15:44:37 +02002720 !need_wait, &err);
Johann Baudy69e3c752009-05-18 22:11:22 -07002721
Kretschmer, Mathiasfbf33a22015-05-08 15:44:37 +02002722 if (unlikely(skb == NULL)) {
2723 /* we assume the socket was initially writeable ... */
2724 if (likely(len_sum > 0))
2725 err = len_sum;
Johann Baudy69e3c752009-05-18 22:11:22 -07002726 goto out_status;
Kretschmer, Mathiasfbf33a22015-05-08 15:44:37 +02002727 }
Willem de Bruijn8d39b4a2016-02-03 18:02:16 -05002728 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -04002729 addr, hlen, copylen, &sockc);
Alexander Drozdovdbd46ab2015-07-28 13:57:01 +03002730 if (likely(tp_len >= 0) &&
Daniel Borkmann5cfb4c82015-11-11 23:25:44 +01002731 tp_len > dev->mtu + reserve &&
Willem de Bruijn1d036d22016-02-03 18:02:17 -05002732 !po->has_vnet_hdr &&
Daniel Borkmann3c70c132015-11-11 23:25:42 +01002733 !packet_extra_vlan_len_allowed(dev, skb))
2734 tp_len = -EMSGSIZE;
Johann Baudy69e3c752009-05-18 22:11:22 -07002735
2736 if (unlikely(tp_len < 0)) {
Willem de Bruijn8d39b4a2016-02-03 18:02:16 -05002737tpacket_error:
Johann Baudy69e3c752009-05-18 22:11:22 -07002738 if (po->tp_loss) {
2739 __packet_set_status(po, ph,
2740 TP_STATUS_AVAILABLE);
2741 packet_increment_head(&po->tx_ring);
2742 kfree_skb(skb);
2743 continue;
2744 } else {
2745 status = TP_STATUS_WRONG_FORMAT;
2746 err = tp_len;
2747 goto out_status;
2748 }
2749 }
2750
Jarno Rajahalmedb60eb5f2016-11-18 15:40:41 -08002751 if (po->has_vnet_hdr && virtio_net_hdr_to_skb(skb, vnet_hdr,
2752 vio_le())) {
Willem de Bruijn1d036d22016-02-03 18:02:17 -05002753 tp_len = -EINVAL;
2754 goto tpacket_error;
2755 }
2756
Johann Baudy69e3c752009-05-18 22:11:22 -07002757 skb->destructor = tpacket_destruct_skb;
2758 __packet_set_status(po, ph, TP_STATUS_SENDING);
Daniel Borkmannb0138402014-01-15 16:25:36 +01002759 packet_inc_pending(&po->tx_ring);
Johann Baudy69e3c752009-05-18 22:11:22 -07002760
2761 status = TP_STATUS_SEND_REQUEST;
Daniel Borkmannd346a3f2013-12-06 11:36:17 +01002762 err = po->xmit(skb);
Jarek Poplawskieb70df12010-01-10 22:04:19 +00002763 if (unlikely(err > 0)) {
2764 err = net_xmit_errno(err);
2765 if (err && __packet_get_status(po, ph) ==
2766 TP_STATUS_AVAILABLE) {
2767 /* skb was destructed already */
2768 skb = NULL;
2769 goto out_status;
2770 }
2771 /*
2772 * skb was dropped but not destructed yet;
2773 * let's treat it like congestion or err < 0
2774 */
2775 err = 0;
2776 }
Johann Baudy69e3c752009-05-18 22:11:22 -07002777 packet_increment_head(&po->tx_ring);
2778 len_sum += tp_len;
Daniel Borkmannb0138402014-01-15 16:25:36 +01002779 } while (likely((ph != NULL) ||
2780 /* Note: packet_read_pending() might be slow if we have
2781 * to call it as it's per_cpu variable, but in fast-path
2782 * we already short-circuit the loop with the first
2783 * condition, and luckily don't have to go that path
2784 * anyway.
2785 */
2786 (need_wait && packet_read_pending(&po->tx_ring))));
Johann Baudy69e3c752009-05-18 22:11:22 -07002787
2788 err = len_sum;
2789 goto out_put;
2790
Johann Baudy69e3c752009-05-18 22:11:22 -07002791out_status:
2792 __packet_set_status(po, ph, status);
2793 kfree_skb(skb);
2794out_put:
Daniel Borkmanne40526c2013-11-21 16:50:58 +01002795 dev_put(dev);
Johann Baudy69e3c752009-05-18 22:11:22 -07002796out:
2797 mutex_unlock(&po->pg_vec_lock);
2798 return err;
2799}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002800
Olof Johanssoneea49cc92011-11-02 11:00:49 +00002801static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2802 size_t reserve, size_t len,
2803 size_t linear, int noblock,
2804 int *err)
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002805{
2806 struct sk_buff *skb;
2807
2808 /* Under a page? Don't bother with paged skb. */
2809 if (prepad + len < PAGE_SIZE || !linear)
2810 linear = len;
2811
2812 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
Eric Dumazet28d64272013-08-08 14:38:47 -07002813 err, 0);
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002814 if (!skb)
2815 return NULL;
2816
2817 skb_reserve(skb, reserve);
2818 skb_put(skb, linear);
2819 skb->data_len = len - linear;
2820 skb->len += len - linear;
2821
2822 return skb;
2823}
2824
Daniel Borkmannd346a3f2013-12-06 11:36:17 +01002825static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002826{
2827 struct sock *sk = sock->sk;
Steffen Hurrle342dfc32014-01-17 22:53:15 +01002828 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002829 struct sk_buff *skb;
2830 struct net_device *dev;
Al Viro0e11c912006-11-08 00:26:29 -08002831 __be16 proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002832 unsigned char *addr;
Ben Greear827d9782011-06-01 07:18:53 +00002833 int err, reserve = 0;
Edward Jeec7d39e32015-10-08 14:56:49 -07002834 struct sockcm_cookie sockc;
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002835 struct virtio_net_hdr vnet_hdr = { 0 };
2836 int offset = 0;
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002837 struct packet_sock *po = pkt_sk(sk);
Willem de Bruijnda7c9562017-09-26 12:20:17 -04002838 bool has_vnet_hdr = false;
Willem de Bruijn57031eb2017-02-07 15:57:21 -05002839 int hlen, tlen, linear;
Ben Greear3bdc0eb2012-02-11 15:39:30 +00002840 int extra_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002841
2842 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002843 * Get and verify the address.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002844 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002845
Daniel Borkmann66e56cd2013-12-06 11:36:15 +01002846 if (likely(saddr == NULL)) {
Daniel Borkmanne40526c2013-11-21 16:50:58 +01002847 dev = packet_cached_dev_get(po);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002848 proto = po->num;
2849 addr = NULL;
2850 } else {
2851 err = -EINVAL;
2852 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2853 goto out;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07002854 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2855 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002856 proto = saddr->sll_protocol;
2857 addr = saddr->sll_addr;
Ben Greear827d9782011-06-01 07:18:53 +00002858 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002859 }
2860
Linus Torvalds1da177e2005-04-16 15:20:36 -07002861 err = -ENXIO;
Daniel Borkmanne40526c2013-11-21 16:50:58 +01002862 if (unlikely(dev == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002863 goto out_unlock;
Daniel Borkmanne40526c2013-11-21 16:50:58 +01002864 err = -ENETDOWN;
2865 if (unlikely(!(dev->flags & IFF_UP)))
2866 goto out_unlock;
2867
Yoshihiro Shimodaedbe7742016-07-19 14:40:51 +09002868 sockc.tsflags = sk->sk_tsflags;
Edward Jeec7d39e32015-10-08 14:56:49 -07002869 sockc.mark = sk->sk_mark;
2870 if (msg->msg_controllen) {
2871 err = sock_cmsg_send(sk, msg, &sockc);
2872 if (unlikely(err))
2873 goto out_unlock;
2874 }
2875
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876 if (sock->type == SOCK_RAW)
2877 reserve = dev->hard_header_len;
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002878 if (po->has_vnet_hdr) {
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002879 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2880 if (err)
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002881 goto out_unlock;
Willem de Bruijnda7c9562017-09-26 12:20:17 -04002882 has_vnet_hdr = true;
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002883 }
2884
Ben Greear3bdc0eb2012-02-11 15:39:30 +00002885 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2886 if (!netif_supports_nofcs(dev)) {
2887 err = -EPROTONOSUPPORT;
2888 goto out_unlock;
2889 }
2890 extra_len = 4; /* We're doing our own CRC */
2891 }
2892
Linus Torvalds1da177e2005-04-16 15:20:36 -07002893 err = -EMSGSIZE;
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002894 if (!vnet_hdr.gso_type &&
2895 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002896 goto out_unlock;
2897
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002898 err = -ENOBUFS;
Herbert Xuae641942011-11-18 02:20:04 +00002899 hlen = LL_RESERVED_SPACE(dev);
2900 tlen = dev->needed_tailroom;
Willem de Bruijn57031eb2017-02-07 15:57:21 -05002901 linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len);
2902 linear = max(linear, min_t(int, len, dev->hard_header_len));
2903 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear,
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002904 msg->msg_flags & MSG_DONTWAIT, &err);
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002905 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906 goto out_unlock;
2907
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002908 skb_set_network_header(skb, reserve);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002909
Stephen Hemminger0c4e8582007-10-09 01:36:32 -07002910 err = -EINVAL;
Willem de Bruijn9c707762014-11-19 13:10:16 -05002911 if (sock->type == SOCK_DGRAM) {
2912 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
Christoph Jaeger46d2cfb2015-01-11 13:01:16 -05002913 if (unlikely(offset < 0))
Willem de Bruijn9c707762014-11-19 13:10:16 -05002914 goto out_free;
Willem de Bruijn9c707762014-11-19 13:10:16 -05002915 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002916
2917 /* Returns -EFAULT on error */
Al Viroc0371da2014-11-24 10:42:55 -05002918 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002919 if (err)
2920 goto out_free;
Daniel Borkmannbf84a012013-04-14 08:08:13 +00002921
Willem de Bruijn9ed988c2016-03-09 21:58:34 -05002922 if (sock->type == SOCK_RAW &&
2923 !dev_validate_header(dev, skb->data, len)) {
2924 err = -EINVAL;
2925 goto out_free;
2926 }
2927
Soheil Hassas Yeganehc14ac942016-04-02 23:08:12 -04002928 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002929
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002930 if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
Daniel Borkmann3c70c132015-11-11 23:25:42 +01002931 !packet_extra_vlan_len_allowed(dev, skb)) {
2932 err = -EMSGSIZE;
2933 goto out_free;
Ben Greear57f89bf2011-02-11 09:35:18 +00002934 }
2935
David S. Miller09effa62013-08-07 17:11:00 -07002936 skb->protocol = proto;
2937 skb->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002938 skb->priority = sk->sk_priority;
Edward Jeec7d39e32015-10-08 14:56:49 -07002939 skb->mark = sockc.mark;
Daniel Borkmann0fd5d572014-02-16 15:55:22 +01002940
Willem de Bruijnda7c9562017-09-26 12:20:17 -04002941 if (has_vnet_hdr) {
Jarno Rajahalmedb60eb5f2016-11-18 15:40:41 -08002942 err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le());
Willem de Bruijn16cc1402016-02-03 18:02:14 -05002943 if (err)
2944 goto out_free;
2945 len += sizeof(vnet_hdr);
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08002946 }
2947
Daniel Borkmann8fd6c802015-11-11 23:25:41 +01002948 skb_probe_transport_header(skb, reserve);
2949
Ben Greear3bdc0eb2012-02-11 15:39:30 +00002950 if (unlikely(extra_len == 4))
2951 skb->no_fcs = 1;
2952
Daniel Borkmannd346a3f2013-12-06 11:36:17 +01002953 err = po->xmit(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002954 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2955 goto out_unlock;
2956
Daniel Borkmanne40526c2013-11-21 16:50:58 +01002957 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002958
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002959 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002960
2961out_free:
2962 kfree_skb(skb);
2963out_unlock:
Daniel Borkmanne40526c2013-11-21 16:50:58 +01002964 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965 dev_put(dev);
2966out:
2967 return err;
2968}
2969
Ying Xue1b784142015-03-02 15:37:48 +08002970static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
Johann Baudy69e3c752009-05-18 22:11:22 -07002971{
Johann Baudy69e3c752009-05-18 22:11:22 -07002972 struct sock *sk = sock->sk;
2973 struct packet_sock *po = pkt_sk(sk);
Daniel Borkmannd346a3f2013-12-06 11:36:17 +01002974
Johann Baudy69e3c752009-05-18 22:11:22 -07002975 if (po->tx_ring.pg_vec)
2976 return tpacket_snd(po, msg);
2977 else
Johann Baudy69e3c752009-05-18 22:11:22 -07002978 return packet_snd(sock, msg, len);
2979}
2980
Linus Torvalds1da177e2005-04-16 15:20:36 -07002981/*
2982 * Close a PACKET socket. This is fairly simple. We immediately go
2983 * to 'closed' state and remove our protocol entry in the device list.
2984 */
2985
2986static int packet_release(struct socket *sock)
2987{
2988 struct sock *sk = sock->sk;
2989 struct packet_sock *po;
Anoob Soman2bd624b2017-02-15 20:25:39 +00002990 struct packet_fanout *f;
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002991 struct net *net;
chetan lokef6fb8f102011-08-19 10:18:16 +00002992 union tpacket_req_u req_u;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993
2994 if (!sk)
2995 return 0;
2996
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09002997 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002998 po = pkt_sk(sk);
2999
Pavel Emelyanov0fa7fa92012-08-21 01:06:47 +00003000 mutex_lock(&net->packet.sklist_lock);
stephen hemminger808f5112010-02-22 07:57:18 +00003001 sk_del_node_init_rcu(sk);
Pavel Emelyanov0fa7fa92012-08-21 01:06:47 +00003002 mutex_unlock(&net->packet.sklist_lock);
3003
3004 preempt_disable();
Eric Dumazet920de802008-11-24 00:09:29 -08003005 sock_prot_inuse_add(net, sk->sk_prot, -1);
Pavel Emelyanov0fa7fa92012-08-21 01:06:47 +00003006 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003007
stephen hemminger808f5112010-02-22 07:57:18 +00003008 spin_lock(&po->bind_lock);
David S. Millerce06b032011-07-04 01:44:29 -07003009 unregister_prot_hook(sk, false);
Daniel Borkmann66e56cd2013-12-06 11:36:15 +01003010 packet_cached_dev_reset(po);
3011
Ben Greear160ff182011-06-01 07:18:52 +00003012 if (po->prot_hook.dev) {
3013 dev_put(po->prot_hook.dev);
3014 po->prot_hook.dev = NULL;
3015 }
stephen hemminger808f5112010-02-22 07:57:18 +00003016 spin_unlock(&po->bind_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003017
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 packet_flush_mclist(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003019
Phil Sutter9665d5d2013-02-01 07:21:41 +00003020 if (po->rx_ring.pg_vec) {
3021 memset(&req_u, 0, sizeof(req_u));
chetan lokef6fb8f102011-08-19 10:18:16 +00003022 packet_set_ring(sk, &req_u, 1, 0);
Phil Sutter9665d5d2013-02-01 07:21:41 +00003023 }
Johann Baudy69e3c752009-05-18 22:11:22 -07003024
Phil Sutter9665d5d2013-02-01 07:21:41 +00003025 if (po->tx_ring.pg_vec) {
3026 memset(&req_u, 0, sizeof(req_u));
chetan lokef6fb8f102011-08-19 10:18:16 +00003027 packet_set_ring(sk, &req_u, 1, 1);
Phil Sutter9665d5d2013-02-01 07:21:41 +00003028 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029
Anoob Soman2bd624b2017-02-15 20:25:39 +00003030 f = fanout_release(sk);
David S. Millerdc99f602011-07-05 01:45:05 -07003031
stephen hemminger808f5112010-02-22 07:57:18 +00003032 synchronize_net();
Anoob Soman2bd624b2017-02-15 20:25:39 +00003033
3034 if (f) {
Mike Maloney7263f11b2017-11-28 10:44:29 -05003035 kfree(po->rollover);
Anoob Soman2bd624b2017-02-15 20:25:39 +00003036 fanout_release_data(f);
3037 kfree(f);
3038 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003039 /*
3040 * Now the socket is dead. No more input will appear.
3041 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003042 sock_orphan(sk);
3043 sock->sk = NULL;
3044
3045 /* Purge queues */
3046
3047 skb_queue_purge(&sk->sk_receive_queue);
Daniel Borkmannb0138402014-01-15 16:25:36 +01003048 packet_free_pending(po);
Pavel Emelyanov17ab56a2007-11-10 21:38:48 -08003049 sk_refcnt_debug_release(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003050
3051 sock_put(sk);
3052 return 0;
3053}
3054
3055/*
3056 * Attach a packet hook.
3057 */
3058
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003059static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3060 __be16 proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003061{
3062 struct packet_sock *po = pkt_sk(sk);
Lars Westerhoff158cd4a2015-07-28 01:32:21 +03003063 struct net_device *dev_curr;
Daniel Borkmann902fefb2014-01-15 16:25:34 +01003064 __be16 proto_curr;
3065 bool need_rehook;
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003066 struct net_device *dev = NULL;
3067 int ret = 0;
3068 bool unlisted = false;
David S. Millerdc99f602011-07-05 01:45:05 -07003069
Linus Torvalds1da177e2005-04-16 15:20:36 -07003070 lock_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003071 spin_lock(&po->bind_lock);
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003072 rcu_read_lock();
3073
Willem de Bruijn49716132017-09-26 12:19:37 -04003074 if (po->fanout) {
3075 ret = -EINVAL;
3076 goto out_unlock;
3077 }
3078
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003079 if (name) {
3080 dev = dev_get_by_name_rcu(sock_net(sk), name);
3081 if (!dev) {
3082 ret = -ENODEV;
3083 goto out_unlock;
3084 }
3085 } else if (ifindex) {
3086 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3087 if (!dev) {
3088 ret = -ENODEV;
3089 goto out_unlock;
3090 }
3091 }
3092
3093 if (dev)
3094 dev_hold(dev);
Daniel Borkmann66e56cd2013-12-06 11:36:15 +01003095
Daniel Borkmann902fefb2014-01-15 16:25:34 +01003096 proto_curr = po->prot_hook.type;
3097 dev_curr = po->prot_hook.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003098
Daniel Borkmann902fefb2014-01-15 16:25:34 +01003099 need_rehook = proto_curr != proto || dev_curr != dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003100
Daniel Borkmann902fefb2014-01-15 16:25:34 +01003101 if (need_rehook) {
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003102 if (po->running) {
3103 rcu_read_unlock();
Eric Dumazet589983e2017-11-28 08:03:30 -08003104 /* prevents packet_notifier() from calling
3105 * register_prot_hook()
3106 */
3107 po->num = 0;
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003108 __unregister_prot_hook(sk, true);
3109 rcu_read_lock();
3110 dev_curr = po->prot_hook.dev;
3111 if (dev)
3112 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3113 dev->ifindex);
3114 }
Daniel Borkmann66e56cd2013-12-06 11:36:15 +01003115
Eric Dumazet589983e2017-11-28 08:03:30 -08003116 BUG_ON(po->running);
Daniel Borkmann902fefb2014-01-15 16:25:34 +01003117 po->num = proto;
3118 po->prot_hook.type = proto;
Daniel Borkmann902fefb2014-01-15 16:25:34 +01003119
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003120 if (unlikely(unlisted)) {
3121 dev_put(dev);
3122 po->prot_hook.dev = NULL;
3123 po->ifindex = -1;
3124 packet_cached_dev_reset(po);
3125 } else {
3126 po->prot_hook.dev = dev;
3127 po->ifindex = dev ? dev->ifindex : 0;
3128 packet_cached_dev_assign(po, dev);
3129 }
Daniel Borkmann902fefb2014-01-15 16:25:34 +01003130 }
Lars Westerhoff158cd4a2015-07-28 01:32:21 +03003131 if (dev_curr)
3132 dev_put(dev_curr);
Daniel Borkmann902fefb2014-01-15 16:25:34 +01003133
3134 if (proto == 0 || !need_rehook)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003135 goto out_unlock;
3136
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003137 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
David S. Millerce06b032011-07-04 01:44:29 -07003138 register_prot_hook(sk);
Urs Thuermannbe85d4a2007-11-12 21:05:20 -08003139 } else {
3140 sk->sk_err = ENETDOWN;
3141 if (!sock_flag(sk, SOCK_DEAD))
3142 sk->sk_error_report(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003143 }
3144
3145out_unlock:
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003146 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003147 spin_unlock(&po->bind_lock);
3148 release_sock(sk);
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003149 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003150}
3151
3152/*
3153 * Bind a packet socket to a device
3154 */
3155
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00003156static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3157 int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003158{
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00003159 struct sock *sk = sock->sk;
Alexander Potapenko540e2892017-03-01 12:57:20 +01003160 char name[sizeof(uaddr->sa_data) + 1];
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09003161
Linus Torvalds1da177e2005-04-16 15:20:36 -07003162 /*
3163 * Check legality
3164 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09003165
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08003166 if (addr_len != sizeof(struct sockaddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003167 return -EINVAL;
Alexander Potapenko540e2892017-03-01 12:57:20 +01003168 /* uaddr->sa_data comes from the userspace, it's not guaranteed to be
3169 * zero-terminated.
3170 */
3171 memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data));
3172 name[sizeof(uaddr->sa_data)] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003173
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003174 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003175}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003176
3177static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3178{
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00003179 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3180 struct sock *sk = sock->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003181
3182 /*
3183 * Check legality
3184 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09003185
Linus Torvalds1da177e2005-04-16 15:20:36 -07003186 if (addr_len < sizeof(struct sockaddr_ll))
3187 return -EINVAL;
3188 if (sll->sll_family != AF_PACKET)
3189 return -EINVAL;
3190
Francesco Ruggeri30f7ea12015-11-05 08:16:14 -08003191 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3192 sll->sll_protocol ? : pkt_sk(sk)->num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003193}
3194
3195static struct proto packet_proto = {
3196 .name = "PACKET",
3197 .owner = THIS_MODULE,
3198 .obj_size = sizeof(struct packet_sock),
3199};
3200
3201/*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09003202 * Create a packet of type SOCK_PACKET.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003203 */
3204
Eric Paris3f378b62009-11-05 22:18:14 -08003205static int packet_create(struct net *net, struct socket *sock, int protocol,
3206 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003207{
3208 struct sock *sk;
3209 struct packet_sock *po;
Al Viro0e11c912006-11-08 00:26:29 -08003210 __be16 proto = (__force __be16)protocol; /* weird, but documented */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003211 int err;
3212
Eric W. Biedermandf008c92012-11-16 03:03:07 +00003213 if (!ns_capable(net->user_ns, CAP_NET_RAW))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003214 return -EPERM;
David S. Millerbe020972007-05-29 13:16:31 -07003215 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3216 sock->type != SOCK_PACKET)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003217 return -ESOCKTNOSUPPORT;
3218
3219 sock->state = SS_UNCONNECTED;
3220
3221 err = -ENOBUFS;
Eric W. Biederman11aa9c22015-05-08 21:09:13 -05003222 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003223 if (sk == NULL)
3224 goto out;
3225
3226 sock->ops = &packet_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003227 if (sock->type == SOCK_PACKET)
3228 sock->ops = &packet_ops_spkt;
David S. Millerbe020972007-05-29 13:16:31 -07003229
Linus Torvalds1da177e2005-04-16 15:20:36 -07003230 sock_init_data(sock, sk);
3231
3232 po = pkt_sk(sk);
3233 sk->sk_family = PF_PACKET;
Al Viro0e11c912006-11-08 00:26:29 -08003234 po->num = proto;
Daniel Borkmannd346a3f2013-12-06 11:36:17 +01003235 po->xmit = dev_queue_xmit;
Daniel Borkmann66e56cd2013-12-06 11:36:15 +01003236
Daniel Borkmannb0138402014-01-15 16:25:36 +01003237 err = packet_alloc_pending(po);
3238 if (err)
3239 goto out2;
3240
Daniel Borkmann66e56cd2013-12-06 11:36:15 +01003241 packet_cached_dev_reset(po);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003242
3243 sk->sk_destruct = packet_sock_destruct;
Pavel Emelyanov17ab56a2007-11-10 21:38:48 -08003244 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003245
3246 /*
3247 * Attach a protocol block
3248 */
3249
3250 spin_lock_init(&po->bind_lock);
Herbert Xu905db442009-01-30 14:12:06 -08003251 mutex_init(&po->pg_vec_lock);
Willem de Bruijn0648ab72015-05-12 11:56:46 -04003252 po->rollover = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003253 po->prot_hook.func = packet_rcv;
David S. Millerbe020972007-05-29 13:16:31 -07003254
Linus Torvalds1da177e2005-04-16 15:20:36 -07003255 if (sock->type == SOCK_PACKET)
3256 po->prot_hook.func = packet_rcv_spkt;
David S. Millerbe020972007-05-29 13:16:31 -07003257
Linus Torvalds1da177e2005-04-16 15:20:36 -07003258 po->prot_hook.af_packet_priv = sk;
3259
Al Viro0e11c912006-11-08 00:26:29 -08003260 if (proto) {
3261 po->prot_hook.type = proto;
David S. Millerce06b032011-07-04 01:44:29 -07003262 register_prot_hook(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003263 }
3264
Pavel Emelyanov0fa7fa92012-08-21 01:06:47 +00003265 mutex_lock(&net->packet.sklist_lock);
stephen hemminger808f5112010-02-22 07:57:18 +00003266 sk_add_node_rcu(sk, &net->packet.sklist);
Pavel Emelyanov0fa7fa92012-08-21 01:06:47 +00003267 mutex_unlock(&net->packet.sklist_lock);
3268
3269 preempt_disable();
Eric Dumazet36804532008-11-19 14:25:35 -08003270 sock_prot_inuse_add(net, &packet_proto, 1);
Pavel Emelyanov0fa7fa92012-08-21 01:06:47 +00003271 preempt_enable();
stephen hemminger808f5112010-02-22 07:57:18 +00003272
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00003273 return 0;
Daniel Borkmannb0138402014-01-15 16:25:36 +01003274out2:
3275 sk_free(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003276out:
3277 return err;
3278}
3279
3280/*
3281 * Pull a packet from our receive queue and hand it to the user.
3282 * If necessary we block.
3283 */
3284
Ying Xue1b784142015-03-02 15:37:48 +08003285static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3286 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003287{
3288 struct sock *sk = sock->sk;
3289 struct sk_buff *skb;
3290 int copied, err;
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08003291 int vnet_hdr_len = 0;
Eyal Birger2472d762015-03-01 14:58:28 +02003292 unsigned int origlen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003293
3294 err = -EINVAL;
Richard Cochraned85b562010-04-07 22:41:28 +00003295 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003296 goto out;
3297
3298#if 0
3299 /* What error should we return now? EUNATTACH? */
3300 if (pkt_sk(sk)->ifindex < 0)
3301 return -ENODEV;
3302#endif
3303
Richard Cochraned85b562010-04-07 22:41:28 +00003304 if (flags & MSG_ERRQUEUE) {
Richard Cochrancb820f82013-07-19 19:40:09 +02003305 err = sock_recv_errqueue(sk, msg, len,
3306 SOL_PACKET, PACKET_TX_TIMESTAMP);
Richard Cochraned85b562010-04-07 22:41:28 +00003307 goto out;
3308 }
3309
Linus Torvalds1da177e2005-04-16 15:20:36 -07003310 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07003311 * Call the generic datagram receiver. This handles all sorts
3312 * of horrible races and re-entrancy so we can forget about it
3313 * in the protocol layers.
3314 *
3315 * Now it will return ENETDOWN, if device have just gone down,
3316 * but then it will block.
3317 */
3318
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00003319 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003320
3321 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09003322 * An error occurred so return it. Because skb_recv_datagram()
Linus Torvalds1da177e2005-04-16 15:20:36 -07003323 * handles the blocking we don't see and worry about blocking
3324 * retries.
3325 */
3326
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08003327 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003328 goto out;
3329
Willem de Bruijn2ccdbaa2015-05-12 11:56:48 -04003330 if (pkt_sk(sk)->pressure)
3331 packet_rcv_has_room(pkt_sk(sk), NULL);
3332
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08003333 if (pkt_sk(sk)->has_vnet_hdr) {
Willem de Bruijn16cc1402016-02-03 18:02:14 -05003334 err = packet_rcv_vnet(msg, skb, &len);
3335 if (err)
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08003336 goto out_free;
Willem de Bruijn16cc1402016-02-03 18:02:14 -05003337 vnet_hdr_len = sizeof(struct virtio_net_hdr);
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08003338 }
3339
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01003340 /* You lose any data beyond the buffer you gave. If it worries
3341 * a user program they can ask the device for its MTU
3342 * anyway.
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07003343 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003344 copied = skb->len;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00003345 if (copied > len) {
3346 copied = len;
3347 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003348 }
3349
David S. Miller51f3d022014-11-05 16:46:40 -05003350 err = skb_copy_datagram_msg(skb, 0, msg, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003351 if (err)
3352 goto out_free;
3353
Eyal Birger2472d762015-03-01 14:58:28 +02003354 if (sock->type != SOCK_PACKET) {
3355 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3356
3357 /* Original length was stored in sockaddr_ll fields */
3358 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3359 sll->sll_family = AF_PACKET;
3360 sll->sll_protocol = skb->protocol;
3361 }
3362
Neil Horman3b885782009-10-12 13:26:31 -07003363 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003364
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01003365 if (msg->msg_name) {
3366 /* If the address length field is there to be filled
3367 * in, we fill it in now.
3368 */
3369 if (sock->type == SOCK_PACKET) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +01003370 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01003371 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3372 } else {
3373 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
Eyal Birger2472d762015-03-01 14:58:28 +02003374
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01003375 msg->msg_namelen = sll->sll_halen +
3376 offsetof(struct sockaddr_ll, sll_addr);
3377 }
Herbert Xuffbc6112007-02-04 23:33:10 -08003378 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
3379 msg->msg_namelen);
Hannes Frederic Sowaf3d33422013-11-21 03:14:22 +01003380 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003381
Herbert Xu8dc41942007-02-04 23:31:32 -08003382 if (pkt_sk(sk)->auxdata) {
Herbert Xuffbc6112007-02-04 23:33:10 -08003383 struct tpacket_auxdata aux;
3384
3385 aux.tp_status = TP_STATUS_USER;
3386 if (skb->ip_summed == CHECKSUM_PARTIAL)
3387 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
Alexander Drozdov682f0482015-03-23 09:11:13 +03003388 else if (skb->pkt_type != PACKET_OUTGOING &&
3389 (skb->ip_summed == CHECKSUM_COMPLETE ||
3390 skb_csum_unnecessary(skb)))
3391 aux.tp_status |= TP_STATUS_CSUM_VALID;
3392
Eyal Birger2472d762015-03-01 14:58:28 +02003393 aux.tp_len = origlen;
Herbert Xuffbc6112007-02-04 23:33:10 -08003394 aux.tp_snaplen = skb->len;
3395 aux.tp_mac = 0;
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -03003396 aux.tp_net = skb_network_offset(skb);
Jiri Pirkodf8a39d2015-01-13 17:13:44 +01003397 if (skb_vlan_tag_present(skb)) {
3398 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
Atzm Watanabea0cdfcf2013-12-17 22:53:40 +09003399 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3400 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
Ben Greeara3bcc232011-06-01 06:49:10 +00003401 } else {
3402 aux.tp_vlan_tci = 0;
Atzm Watanabea0cdfcf2013-12-17 22:53:40 +09003403 aux.tp_vlan_tpid = 0;
Ben Greeara3bcc232011-06-01 06:49:10 +00003404 }
Herbert Xuffbc6112007-02-04 23:33:10 -08003405 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
Herbert Xu8dc41942007-02-04 23:31:32 -08003406 }
3407
Linus Torvalds1da177e2005-04-16 15:20:36 -07003408 /*
3409 * Free or return the buffer as appropriate. Again this
3410 * hides all the races and re-entrancy issues from us.
3411 */
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08003412 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003413
3414out_free:
3415 skb_free_datagram(sk, skb);
3416out:
3417 return err;
3418}
3419
Linus Torvalds1da177e2005-04-16 15:20:36 -07003420static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3421 int *uaddr_len, int peer)
3422{
3423 struct net_device *dev;
3424 struct sock *sk = sock->sk;
3425
3426 if (peer)
3427 return -EOPNOTSUPP;
3428
3429 uaddr->sa_family = AF_PACKET;
Daniel Borkmann2dc85bf2013-06-12 16:02:27 +02003430 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
Eric Dumazet654d1f82009-11-02 10:43:32 +01003431 rcu_read_lock();
3432 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3433 if (dev)
Daniel Borkmann2dc85bf2013-06-12 16:02:27 +02003434 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
Eric Dumazet654d1f82009-11-02 10:43:32 +01003435 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003436 *uaddr_len = sizeof(*uaddr);
3437
3438 return 0;
3439}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003440
3441static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3442 int *uaddr_len, int peer)
3443{
3444 struct net_device *dev;
3445 struct sock *sk = sock->sk;
3446 struct packet_sock *po = pkt_sk(sk);
Cyrill Gorcunov13cfa972009-11-08 05:51:19 +00003447 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003448
3449 if (peer)
3450 return -EOPNOTSUPP;
3451
3452 sll->sll_family = AF_PACKET;
3453 sll->sll_ifindex = po->ifindex;
3454 sll->sll_protocol = po->num;
Vasiliy Kulikov67286642010-11-10 12:09:10 -08003455 sll->sll_pkttype = 0;
Eric Dumazet654d1f82009-11-02 10:43:32 +01003456 rcu_read_lock();
3457 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003458 if (dev) {
3459 sll->sll_hatype = dev->type;
3460 sll->sll_halen = dev->addr_len;
3461 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003462 } else {
3463 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3464 sll->sll_halen = 0;
3465 }
Eric Dumazet654d1f82009-11-02 10:43:32 +01003466 rcu_read_unlock();
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07003467 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003468
3469 return 0;
3470}
3471
Wang Chen2aeb0b82008-07-14 20:49:46 -07003472static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3473 int what)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003474{
3475 switch (i->type) {
3476 case PACKET_MR_MULTICAST:
Jiri Pirko11625632010-03-02 20:40:01 +00003477 if (i->alen != dev->addr_len)
3478 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003479 if (what > 0)
Jiri Pirko22bedad32010-04-01 21:22:57 +00003480 return dev_mc_add(dev, i->addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003481 else
Jiri Pirko22bedad32010-04-01 21:22:57 +00003482 return dev_mc_del(dev, i->addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003483 break;
3484 case PACKET_MR_PROMISC:
Wang Chen2aeb0b82008-07-14 20:49:46 -07003485 return dev_set_promiscuity(dev, what);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003486 case PACKET_MR_ALLMULTI:
Wang Chen2aeb0b82008-07-14 20:49:46 -07003487 return dev_set_allmulti(dev, what);
Eric W. Biedermand95ed922009-05-19 18:27:17 +00003488 case PACKET_MR_UNICAST:
Jiri Pirko11625632010-03-02 20:40:01 +00003489 if (i->alen != dev->addr_len)
3490 return -EINVAL;
Eric W. Biedermand95ed922009-05-19 18:27:17 +00003491 if (what > 0)
Jiri Pirkoa748ee22010-04-01 21:22:09 +00003492 return dev_uc_add(dev, i->addr);
Eric W. Biedermand95ed922009-05-19 18:27:17 +00003493 else
Jiri Pirkoa748ee22010-04-01 21:22:09 +00003494 return dev_uc_del(dev, i->addr);
Eric W. Biedermand95ed922009-05-19 18:27:17 +00003495 break;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00003496 default:
3497 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003498 }
Wang Chen2aeb0b82008-07-14 20:49:46 -07003499 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003500}
3501
Francesco Ruggeri82f17092015-03-09 11:51:04 -07003502static void packet_dev_mclist_delete(struct net_device *dev,
3503 struct packet_mclist **mlp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003504{
Francesco Ruggeri82f17092015-03-09 11:51:04 -07003505 struct packet_mclist *ml;
3506
3507 while ((ml = *mlp) != NULL) {
3508 if (ml->ifindex == dev->ifindex) {
3509 packet_dev_mc(dev, ml, -1);
3510 *mlp = ml->next;
3511 kfree(ml);
3512 } else
3513 mlp = &ml->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003514 }
3515}
3516
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07003517static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003518{
3519 struct packet_sock *po = pkt_sk(sk);
3520 struct packet_mclist *ml, *i;
3521 struct net_device *dev;
3522 int err;
3523
3524 rtnl_lock();
3525
3526 err = -ENODEV;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09003527 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003528 if (!dev)
3529 goto done;
3530
3531 err = -EINVAL;
Jiri Pirko11625632010-03-02 20:40:01 +00003532 if (mreq->mr_alen > dev->addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003533 goto done;
3534
3535 err = -ENOBUFS;
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08003536 i = kmalloc(sizeof(*i), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003537 if (i == NULL)
3538 goto done;
3539
3540 err = 0;
3541 for (ml = po->mclist; ml; ml = ml->next) {
3542 if (ml->ifindex == mreq->mr_ifindex &&
3543 ml->type == mreq->mr_type &&
3544 ml->alen == mreq->mr_alen &&
3545 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3546 ml->count++;
3547 /* Free the new element ... */
3548 kfree(i);
3549 goto done;
3550 }
3551 }
3552
3553 i->type = mreq->mr_type;
3554 i->ifindex = mreq->mr_ifindex;
3555 i->alen = mreq->mr_alen;
3556 memcpy(i->addr, mreq->mr_address, i->alen);
Mathias Krause309cf372016-04-10 12:52:28 +02003557 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003558 i->count = 1;
3559 i->next = po->mclist;
3560 po->mclist = i;
Wang Chen2aeb0b82008-07-14 20:49:46 -07003561 err = packet_dev_mc(dev, i, 1);
3562 if (err) {
3563 po->mclist = i->next;
3564 kfree(i);
3565 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003566
3567done:
3568 rtnl_unlock();
3569 return err;
3570}
3571
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07003572static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003573{
3574 struct packet_mclist *ml, **mlp;
3575
3576 rtnl_lock();
3577
3578 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3579 if (ml->ifindex == mreq->mr_ifindex &&
3580 ml->type == mreq->mr_type &&
3581 ml->alen == mreq->mr_alen &&
3582 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3583 if (--ml->count == 0) {
3584 struct net_device *dev;
3585 *mlp = ml->next;
Eric Dumazetad959e72009-10-16 06:38:46 +00003586 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3587 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003588 packet_dev_mc(dev, ml, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003589 kfree(ml);
3590 }
Francesco Ruggeri82f17092015-03-09 11:51:04 -07003591 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003592 }
3593 }
3594 rtnl_unlock();
Francesco Ruggeri82f17092015-03-09 11:51:04 -07003595 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003596}
3597
3598static void packet_flush_mclist(struct sock *sk)
3599{
3600 struct packet_sock *po = pkt_sk(sk);
3601 struct packet_mclist *ml;
3602
3603 if (!po->mclist)
3604 return;
3605
3606 rtnl_lock();
3607 while ((ml = po->mclist) != NULL) {
3608 struct net_device *dev;
3609
3610 po->mclist = ml->next;
Eric Dumazetad959e72009-10-16 06:38:46 +00003611 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3612 if (dev != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003613 packet_dev_mc(dev, ml, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003614 kfree(ml);
3615 }
3616 rtnl_unlock();
3617}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003618
3619static int
David S. Millerb7058842009-09-30 16:12:20 -07003620packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003621{
3622 struct sock *sk = sock->sk;
Herbert Xu8dc41942007-02-04 23:31:32 -08003623 struct packet_sock *po = pkt_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003624 int ret;
3625
3626 if (level != SOL_PACKET)
3627 return -ENOPROTOOPT;
3628
Johann Baudy69e3c752009-05-18 22:11:22 -07003629 switch (optname) {
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09003630 case PACKET_ADD_MEMBERSHIP:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003631 case PACKET_DROP_MEMBERSHIP:
3632 {
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07003633 struct packet_mreq_max mreq;
3634 int len = optlen;
3635 memset(&mreq, 0, sizeof(mreq));
3636 if (len < sizeof(struct packet_mreq))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003637 return -EINVAL;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07003638 if (len > sizeof(mreq))
3639 len = sizeof(mreq);
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00003640 if (copy_from_user(&mreq, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003641 return -EFAULT;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07003642 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3643 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003644 if (optname == PACKET_ADD_MEMBERSHIP)
3645 ret = packet_mc_add(sk, &mreq);
3646 else
3647 ret = packet_mc_drop(sk, &mreq);
3648 return ret;
3649 }
David S. Millera2efcfa2007-05-29 13:12:50 -07003650
Linus Torvalds1da177e2005-04-16 15:20:36 -07003651 case PACKET_RX_RING:
Johann Baudy69e3c752009-05-18 22:11:22 -07003652 case PACKET_TX_RING:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003653 {
chetan lokef6fb8f102011-08-19 10:18:16 +00003654 union tpacket_req_u req_u;
3655 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003656
chetan lokef6fb8f102011-08-19 10:18:16 +00003657 switch (po->tp_version) {
3658 case TPACKET_V1:
3659 case TPACKET_V2:
3660 len = sizeof(req_u.req);
3661 break;
3662 case TPACKET_V3:
3663 default:
3664 len = sizeof(req_u.req3);
3665 break;
3666 }
3667 if (optlen < len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003668 return -EINVAL;
chetan lokef6fb8f102011-08-19 10:18:16 +00003669 if (copy_from_user(&req_u.req, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003670 return -EFAULT;
chetan lokef6fb8f102011-08-19 10:18:16 +00003671 return packet_set_ring(sk, &req_u, 0,
3672 optname == PACKET_TX_RING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003673 }
3674 case PACKET_COPY_THRESH:
3675 {
3676 int val;
3677
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00003678 if (optlen != sizeof(val))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003679 return -EINVAL;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00003680 if (copy_from_user(&val, optval, sizeof(val)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003681 return -EFAULT;
3682
3683 pkt_sk(sk)->copy_thresh = val;
3684 return 0;
3685 }
Patrick McHardybbd6ef82008-07-14 22:50:15 -07003686 case PACKET_VERSION:
3687 {
3688 int val;
3689
3690 if (optlen != sizeof(val))
3691 return -EINVAL;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07003692 if (copy_from_user(&val, optval, sizeof(val)))
3693 return -EFAULT;
3694 switch (val) {
3695 case TPACKET_V1:
3696 case TPACKET_V2:
chetan lokef6fb8f102011-08-19 10:18:16 +00003697 case TPACKET_V3:
Philip Pettersson84ac7262016-11-30 14:55:36 -08003698 break;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07003699 default:
3700 return -EINVAL;
3701 }
Philip Pettersson84ac7262016-11-30 14:55:36 -08003702 lock_sock(sk);
3703 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3704 ret = -EBUSY;
3705 } else {
3706 po->tp_version = val;
3707 ret = 0;
3708 }
3709 release_sock(sk);
3710 return ret;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07003711 }
Patrick McHardy8913336a2008-07-18 18:05:19 -07003712 case PACKET_RESERVE:
3713 {
3714 unsigned int val;
3715
3716 if (optlen != sizeof(val))
3717 return -EINVAL;
Patrick McHardy8913336a2008-07-18 18:05:19 -07003718 if (copy_from_user(&val, optval, sizeof(val)))
3719 return -EFAULT;
Andrey Konovalovbcc53642017-03-29 16:11:22 +02003720 if (val > INT_MAX)
3721 return -EINVAL;
Willem de Bruijnc27927e2017-08-10 12:41:58 -04003722 lock_sock(sk);
3723 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3724 ret = -EBUSY;
3725 } else {
3726 po->tp_reserve = val;
3727 ret = 0;
3728 }
3729 release_sock(sk);
3730 return ret;
Patrick McHardy8913336a2008-07-18 18:05:19 -07003731 }
Johann Baudy69e3c752009-05-18 22:11:22 -07003732 case PACKET_LOSS:
3733 {
3734 unsigned int val;
3735
3736 if (optlen != sizeof(val))
3737 return -EINVAL;
3738 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3739 return -EBUSY;
3740 if (copy_from_user(&val, optval, sizeof(val)))
3741 return -EFAULT;
3742 po->tp_loss = !!val;
3743 return 0;
3744 }
Herbert Xu8dc41942007-02-04 23:31:32 -08003745 case PACKET_AUXDATA:
3746 {
3747 int val;
3748
3749 if (optlen < sizeof(val))
3750 return -EINVAL;
3751 if (copy_from_user(&val, optval, sizeof(val)))
3752 return -EFAULT;
3753
3754 po->auxdata = !!val;
3755 return 0;
3756 }
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -07003757 case PACKET_ORIGDEV:
3758 {
3759 int val;
3760
3761 if (optlen < sizeof(val))
3762 return -EINVAL;
3763 if (copy_from_user(&val, optval, sizeof(val)))
3764 return -EFAULT;
3765
3766 po->origdev = !!val;
3767 return 0;
3768 }
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08003769 case PACKET_VNET_HDR:
3770 {
3771 int val;
3772
3773 if (sock->type != SOCK_RAW)
3774 return -EINVAL;
3775 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3776 return -EBUSY;
3777 if (optlen < sizeof(val))
3778 return -EINVAL;
3779 if (copy_from_user(&val, optval, sizeof(val)))
3780 return -EFAULT;
3781
3782 po->has_vnet_hdr = !!val;
3783 return 0;
3784 }
Scott McMillan614f60f2010-06-02 05:53:56 -07003785 case PACKET_TIMESTAMP:
3786 {
3787 int val;
3788
3789 if (optlen != sizeof(val))
3790 return -EINVAL;
3791 if (copy_from_user(&val, optval, sizeof(val)))
3792 return -EFAULT;
3793
3794 po->tp_tstamp = val;
3795 return 0;
3796 }
David S. Millerdc99f602011-07-05 01:45:05 -07003797 case PACKET_FANOUT:
3798 {
3799 int val;
3800
3801 if (optlen != sizeof(val))
3802 return -EINVAL;
3803 if (copy_from_user(&val, optval, sizeof(val)))
3804 return -EFAULT;
3805
3806 return fanout_add(sk, val & 0xffff, val >> 16);
3807 }
Willem de Bruijn47dceb82015-08-14 22:31:34 -04003808 case PACKET_FANOUT_DATA:
3809 {
3810 if (!po->fanout)
3811 return -EINVAL;
3812
3813 return fanout_set_data(po, optval, optlen);
3814 }
Paul Chavent5920cd3a2012-11-06 23:10:47 +00003815 case PACKET_TX_HAS_OFF:
3816 {
3817 unsigned int val;
3818
3819 if (optlen != sizeof(val))
3820 return -EINVAL;
3821 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3822 return -EBUSY;
3823 if (copy_from_user(&val, optval, sizeof(val)))
3824 return -EFAULT;
3825 po->tp_tx_has_off = !!val;
3826 return 0;
3827 }
Daniel Borkmannd346a3f2013-12-06 11:36:17 +01003828 case PACKET_QDISC_BYPASS:
3829 {
3830 int val;
3831
3832 if (optlen != sizeof(val))
3833 return -EINVAL;
3834 if (copy_from_user(&val, optval, sizeof(val)))
3835 return -EFAULT;
3836
3837 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3838 return 0;
3839 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003840 default:
3841 return -ENOPROTOOPT;
3842 }
3843}
3844
3845static int packet_getsockopt(struct socket *sock, int level, int optname,
3846 char __user *optval, int __user *optlen)
3847{
3848 int len;
Eric Dumazetc06fff62012-04-19 21:56:11 +00003849 int val, lv = sizeof(val);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003850 struct sock *sk = sock->sk;
3851 struct packet_sock *po = pkt_sk(sk);
Eric Dumazetc06fff62012-04-19 21:56:11 +00003852 void *data = &val;
Daniel Borkmannee80fbf2013-04-19 06:12:29 +00003853 union tpacket_stats_u st;
Willem de Bruijna9b63912015-05-12 11:56:50 -04003854 struct tpacket_rollover_stats rstats;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003855
3856 if (level != SOL_PACKET)
3857 return -ENOPROTOOPT;
3858
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08003859 if (get_user(len, optlen))
3860 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003861
3862 if (len < 0)
3863 return -EINVAL;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09003864
Johann Baudy69e3c752009-05-18 22:11:22 -07003865 switch (optname) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003866 case PACKET_STATISTICS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003867 spin_lock_bh(&sk->sk_receive_queue.lock);
Daniel Borkmannee80fbf2013-04-19 06:12:29 +00003868 memcpy(&st, &po->stats, sizeof(st));
3869 memset(&po->stats, 0, sizeof(po->stats));
3870 spin_unlock_bh(&sk->sk_receive_queue.lock);
3871
chetan lokef6fb8f102011-08-19 10:18:16 +00003872 if (po->tp_version == TPACKET_V3) {
Eric Dumazetc06fff62012-04-19 21:56:11 +00003873 lv = sizeof(struct tpacket_stats_v3);
Willem de Bruijn8bcdeaf2013-08-19 16:40:22 -04003874 st.stats3.tp_packets += st.stats3.tp_drops;
Daniel Borkmannee80fbf2013-04-19 06:12:29 +00003875 data = &st.stats3;
chetan lokef6fb8f102011-08-19 10:18:16 +00003876 } else {
Eric Dumazetc06fff62012-04-19 21:56:11 +00003877 lv = sizeof(struct tpacket_stats);
Willem de Bruijn8bcdeaf2013-08-19 16:40:22 -04003878 st.stats1.tp_packets += st.stats1.tp_drops;
Daniel Borkmannee80fbf2013-04-19 06:12:29 +00003879 data = &st.stats1;
chetan lokef6fb8f102011-08-19 10:18:16 +00003880 }
Daniel Borkmannee80fbf2013-04-19 06:12:29 +00003881
Linus Torvalds1da177e2005-04-16 15:20:36 -07003882 break;
Herbert Xu8dc41942007-02-04 23:31:32 -08003883 case PACKET_AUXDATA:
Herbert Xu8dc41942007-02-04 23:31:32 -08003884 val = po->auxdata;
Herbert Xu8dc41942007-02-04 23:31:32 -08003885 break;
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -07003886 case PACKET_ORIGDEV:
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -07003887 val = po->origdev;
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -07003888 break;
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08003889 case PACKET_VNET_HDR:
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08003890 val = po->has_vnet_hdr;
Sridhar Samudralabfd5f4a2010-02-04 20:24:10 -08003891 break;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07003892 case PACKET_VERSION:
Patrick McHardybbd6ef82008-07-14 22:50:15 -07003893 val = po->tp_version;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07003894 break;
3895 case PACKET_HDRLEN:
3896 if (len > sizeof(int))
3897 len = sizeof(int);
Alexander Potapenkofd2c83b2017-04-25 18:51:46 +02003898 if (len < sizeof(int))
3899 return -EINVAL;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07003900 if (copy_from_user(&val, optval, len))
3901 return -EFAULT;
3902 switch (val) {
3903 case TPACKET_V1:
3904 val = sizeof(struct tpacket_hdr);
3905 break;
3906 case TPACKET_V2:
3907 val = sizeof(struct tpacket2_hdr);
3908 break;
chetan lokef6fb8f102011-08-19 10:18:16 +00003909 case TPACKET_V3:
3910 val = sizeof(struct tpacket3_hdr);
3911 break;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07003912 default:
3913 return -EINVAL;
3914 }
Patrick McHardybbd6ef82008-07-14 22:50:15 -07003915 break;
Patrick McHardy8913336a2008-07-18 18:05:19 -07003916 case PACKET_RESERVE:
Patrick McHardy8913336a2008-07-18 18:05:19 -07003917 val = po->tp_reserve;
Patrick McHardy8913336a2008-07-18 18:05:19 -07003918 break;
Johann Baudy69e3c752009-05-18 22:11:22 -07003919 case PACKET_LOSS:
Johann Baudy69e3c752009-05-18 22:11:22 -07003920 val = po->tp_loss;
Johann Baudy69e3c752009-05-18 22:11:22 -07003921 break;
Scott McMillan614f60f2010-06-02 05:53:56 -07003922 case PACKET_TIMESTAMP:
Scott McMillan614f60f2010-06-02 05:53:56 -07003923 val = po->tp_tstamp;
Scott McMillan614f60f2010-06-02 05:53:56 -07003924 break;
David S. Millerdc99f602011-07-05 01:45:05 -07003925 case PACKET_FANOUT:
David S. Millerdc99f602011-07-05 01:45:05 -07003926 val = (po->fanout ?
3927 ((u32)po->fanout->id |
Willem de Bruijn77f65eb2013-03-19 10:18:11 +00003928 ((u32)po->fanout->type << 16) |
3929 ((u32)po->fanout->flags << 24)) :
David S. Millerdc99f602011-07-05 01:45:05 -07003930 0);
David S. Millerdc99f602011-07-05 01:45:05 -07003931 break;
Willem de Bruijna9b63912015-05-12 11:56:50 -04003932 case PACKET_ROLLOVER_STATS:
Mike Maloney7263f11b2017-11-28 10:44:29 -05003933 if (!po->rollover)
Willem de Bruijna9b63912015-05-12 11:56:50 -04003934 return -EINVAL;
Mike Maloney7263f11b2017-11-28 10:44:29 -05003935 rstats.tp_all = atomic_long_read(&po->rollover->num);
3936 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3937 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3938 data = &rstats;
3939 lv = sizeof(rstats);
Willem de Bruijna9b63912015-05-12 11:56:50 -04003940 break;
Paul Chavent5920cd3a2012-11-06 23:10:47 +00003941 case PACKET_TX_HAS_OFF:
3942 val = po->tp_tx_has_off;
3943 break;
Daniel Borkmannd346a3f2013-12-06 11:36:17 +01003944 case PACKET_QDISC_BYPASS:
3945 val = packet_use_direct_xmit(po);
3946 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003947 default:
3948 return -ENOPROTOOPT;
3949 }
3950
Eric Dumazetc06fff62012-04-19 21:56:11 +00003951 if (len > lv)
3952 len = lv;
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08003953 if (put_user(len, optlen))
3954 return -EFAULT;
Herbert Xu8dc41942007-02-04 23:31:32 -08003955 if (copy_to_user(optval, data, len))
3956 return -EFAULT;
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08003957 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003958}
3959
3960
Willem de Bruijn719c44d2016-06-07 12:06:34 -04003961#ifdef CONFIG_COMPAT
3962static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
3963 char __user *optval, unsigned int optlen)
3964{
3965 struct packet_sock *po = pkt_sk(sock->sk);
3966
3967 if (level != SOL_PACKET)
3968 return -ENOPROTOOPT;
3969
3970 if (optname == PACKET_FANOUT_DATA &&
3971 po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
3972 optval = (char __user *)get_compat_bpf_fprog(optval);
3973 if (!optval)
3974 return -EFAULT;
3975 optlen = sizeof(struct sock_fprog);
3976 }
3977
3978 return packet_setsockopt(sock, level, optname, optval, optlen);
3979}
3980#endif
3981
Jiri Pirko351638e2013-05-28 01:30:21 +00003982static int packet_notifier(struct notifier_block *this,
3983 unsigned long msg, void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003984{
3985 struct sock *sk;
Jiri Pirko351638e2013-05-28 01:30:21 +00003986 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09003987 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003988
stephen hemminger808f5112010-02-22 07:57:18 +00003989 rcu_read_lock();
Sasha Levinb67bfe02013-02-27 17:06:00 -08003990 sk_for_each_rcu(sk, &net->packet.sklist) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003991 struct packet_sock *po = pkt_sk(sk);
3992
3993 switch (msg) {
3994 case NETDEV_UNREGISTER:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003995 if (po->mclist)
Francesco Ruggeri82f17092015-03-09 11:51:04 -07003996 packet_dev_mclist_delete(dev, &po->mclist);
David S. Millera2efcfa2007-05-29 13:12:50 -07003997 /* fallthrough */
3998
Linus Torvalds1da177e2005-04-16 15:20:36 -07003999 case NETDEV_DOWN:
4000 if (dev->ifindex == po->ifindex) {
4001 spin_lock(&po->bind_lock);
4002 if (po->running) {
David S. Millerce06b032011-07-04 01:44:29 -07004003 __unregister_prot_hook(sk, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004004 sk->sk_err = ENETDOWN;
4005 if (!sock_flag(sk, SOCK_DEAD))
4006 sk->sk_error_report(sk);
4007 }
4008 if (msg == NETDEV_UNREGISTER) {
Daniel Borkmann66e56cd2013-12-06 11:36:15 +01004009 packet_cached_dev_reset(po);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004010 po->ifindex = -1;
Ben Greear160ff182011-06-01 07:18:52 +00004011 if (po->prot_hook.dev)
4012 dev_put(po->prot_hook.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004013 po->prot_hook.dev = NULL;
4014 }
4015 spin_unlock(&po->bind_lock);
4016 }
4017 break;
4018 case NETDEV_UP:
stephen hemminger808f5112010-02-22 07:57:18 +00004019 if (dev->ifindex == po->ifindex) {
4020 spin_lock(&po->bind_lock);
David S. Millerce06b032011-07-04 01:44:29 -07004021 if (po->num)
4022 register_prot_hook(sk);
stephen hemminger808f5112010-02-22 07:57:18 +00004023 spin_unlock(&po->bind_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004024 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004025 break;
4026 }
4027 }
stephen hemminger808f5112010-02-22 07:57:18 +00004028 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004029 return NOTIFY_DONE;
4030}
4031
4032
4033static int packet_ioctl(struct socket *sock, unsigned int cmd,
4034 unsigned long arg)
4035{
4036 struct sock *sk = sock->sk;
4037
Johann Baudy69e3c752009-05-18 22:11:22 -07004038 switch (cmd) {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004039 case SIOCOUTQ:
4040 {
4041 int amount = sk_wmem_alloc_get(sk);
Eric Dumazet31e6d362009-06-17 19:05:41 -07004042
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004043 return put_user(amount, (int __user *)arg);
4044 }
4045 case SIOCINQ:
4046 {
4047 struct sk_buff *skb;
4048 int amount = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004049
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004050 spin_lock_bh(&sk->sk_receive_queue.lock);
4051 skb = skb_peek(&sk->sk_receive_queue);
4052 if (skb)
4053 amount = skb->len;
4054 spin_unlock_bh(&sk->sk_receive_queue.lock);
4055 return put_user(amount, (int __user *)arg);
4056 }
4057 case SIOCGSTAMP:
4058 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4059 case SIOCGSTAMPNS:
4060 return sock_get_timestampns(sk, (struct timespec __user *)arg);
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09004061
Linus Torvalds1da177e2005-04-16 15:20:36 -07004062#ifdef CONFIG_INET
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004063 case SIOCADDRT:
4064 case SIOCDELRT:
4065 case SIOCDARP:
4066 case SIOCGARP:
4067 case SIOCSARP:
4068 case SIOCGIFADDR:
4069 case SIOCSIFADDR:
4070 case SIOCGIFBRDADDR:
4071 case SIOCSIFBRDADDR:
4072 case SIOCGIFNETMASK:
4073 case SIOCSIFNETMASK:
4074 case SIOCGIFDSTADDR:
4075 case SIOCSIFDSTADDR:
4076 case SIOCSIFFLAGS:
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004077 return inet_dgram_ops.ioctl(sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004078#endif
4079
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004080 default:
4081 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004082 }
4083 return 0;
4084}
4085
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004086static unsigned int packet_poll(struct file *file, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004087 poll_table *wait)
4088{
4089 struct sock *sk = sock->sk;
4090 struct packet_sock *po = pkt_sk(sk);
4091 unsigned int mask = datagram_poll(file, sock, wait);
4092
4093 spin_lock_bh(&sk->sk_receive_queue.lock);
Johann Baudy69e3c752009-05-18 22:11:22 -07004094 if (po->rx_ring.pg_vec) {
chetan lokef6fb8f102011-08-19 10:18:16 +00004095 if (!packet_previous_rx_frame(po, &po->rx_ring,
4096 TP_STATUS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004097 mask |= POLLIN | POLLRDNORM;
4098 }
Willem de Bruijn2ccdbaa2015-05-12 11:56:48 -04004099 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
Willem de Bruijn54d7c012015-05-14 15:25:02 -04004100 po->pressure = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004101 spin_unlock_bh(&sk->sk_receive_queue.lock);
Johann Baudy69e3c752009-05-18 22:11:22 -07004102 spin_lock_bh(&sk->sk_write_queue.lock);
4103 if (po->tx_ring.pg_vec) {
4104 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4105 mask |= POLLOUT | POLLWRNORM;
4106 }
4107 spin_unlock_bh(&sk->sk_write_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004108 return mask;
4109}
4110
4111
4112/* Dirty? Well, I still did not learn better way to account
4113 * for user mmaps.
4114 */
4115
4116static void packet_mm_open(struct vm_area_struct *vma)
4117{
4118 struct file *file = vma->vm_file;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004119 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004120 struct sock *sk = sock->sk;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09004121
Linus Torvalds1da177e2005-04-16 15:20:36 -07004122 if (sk)
4123 atomic_inc(&pkt_sk(sk)->mapped);
4124}
4125
4126static void packet_mm_close(struct vm_area_struct *vma)
4127{
4128 struct file *file = vma->vm_file;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004129 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004130 struct sock *sk = sock->sk;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09004131
Linus Torvalds1da177e2005-04-16 15:20:36 -07004132 if (sk)
4133 atomic_dec(&pkt_sk(sk)->mapped);
4134}
4135
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04004136static const struct vm_operations_struct packet_mmap_ops = {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004137 .open = packet_mm_open,
4138 .close = packet_mm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004139};
4140
Neil Horman0e3125c2010-11-16 10:26:47 -08004141static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4142 unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004143{
4144 int i;
4145
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004146 for (i = 0; i < len; i++) {
Neil Horman0e3125c2010-11-16 10:26:47 -08004147 if (likely(pg_vec[i].buffer)) {
Changli Gaoc56b4d92010-12-01 02:52:57 +00004148 if (is_vmalloc_addr(pg_vec[i].buffer))
Neil Horman0e3125c2010-11-16 10:26:47 -08004149 vfree(pg_vec[i].buffer);
4150 else
4151 free_pages((unsigned long)pg_vec[i].buffer,
4152 order);
4153 pg_vec[i].buffer = NULL;
4154 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004155 }
4156 kfree(pg_vec);
4157}
4158
Olof Johanssoneea49cc92011-11-02 11:00:49 +00004159static char *alloc_one_pg_vec_page(unsigned long order)
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004160{
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01004161 char *buffer;
Neil Horman0e3125c2010-11-16 10:26:47 -08004162 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4163 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
Eric Dumazet719bfea2009-04-15 03:39:52 -07004164
Neil Horman0e3125c2010-11-16 10:26:47 -08004165 buffer = (char *) __get_free_pages(gfp_flags, order);
Neil Horman0e3125c2010-11-16 10:26:47 -08004166 if (buffer)
4167 return buffer;
4168
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01004169 /* __get_free_pages failed, fall back to vmalloc */
Eric Dumazetbbce5a52010-11-20 07:31:54 +00004170 buffer = vzalloc((1 << order) * PAGE_SIZE);
Neil Horman0e3125c2010-11-16 10:26:47 -08004171 if (buffer)
4172 return buffer;
4173
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01004174 /* vmalloc failed, lets dig into swap here */
Neil Horman0e3125c2010-11-16 10:26:47 -08004175 gfp_flags &= ~__GFP_NORETRY;
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01004176 buffer = (char *) __get_free_pages(gfp_flags, order);
Neil Horman0e3125c2010-11-16 10:26:47 -08004177 if (buffer)
4178 return buffer;
4179
Daniel Borkmannf0d4eb22014-01-19 11:46:53 +01004180 /* complete and utter failure */
Neil Horman0e3125c2010-11-16 10:26:47 -08004181 return NULL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004182}
4183
Neil Horman0e3125c2010-11-16 10:26:47 -08004184static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004185{
4186 unsigned int block_nr = req->tp_block_nr;
Neil Horman0e3125c2010-11-16 10:26:47 -08004187 struct pgv *pg_vec;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004188 int i;
4189
Neil Horman0e3125c2010-11-16 10:26:47 -08004190 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004191 if (unlikely(!pg_vec))
4192 goto out;
4193
4194 for (i = 0; i < block_nr; i++) {
Changli Gaoc56b4d92010-12-01 02:52:57 +00004195 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
Neil Horman0e3125c2010-11-16 10:26:47 -08004196 if (unlikely(!pg_vec[i].buffer))
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004197 goto out_free_pgvec;
4198 }
4199
4200out:
4201 return pg_vec;
4202
4203out_free_pgvec:
4204 free_pg_vec(pg_vec, order, block_nr);
4205 pg_vec = NULL;
4206 goto out;
4207}
Linus Torvalds1da177e2005-04-16 15:20:36 -07004208
chetan lokef6fb8f102011-08-19 10:18:16 +00004209static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
Johann Baudy69e3c752009-05-18 22:11:22 -07004210 int closing, int tx_ring)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004211{
Neil Horman0e3125c2010-11-16 10:26:47 -08004212 struct pgv *pg_vec = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004213 struct packet_sock *po = pkt_sk(sk);
Al Viro0e11c912006-11-08 00:26:29 -08004214 int was_running, order = 0;
Johann Baudy69e3c752009-05-18 22:11:22 -07004215 struct packet_ring_buffer *rb;
4216 struct sk_buff_head *rb_queue;
Al Viro0e11c912006-11-08 00:26:29 -08004217 __be16 num;
chetan lokef6fb8f102011-08-19 10:18:16 +00004218 int err = -EINVAL;
4219 /* Added to avoid minimal code churn */
4220 struct tpacket_req *req = &req_u->req;
4221
Philip Pettersson84ac7262016-11-30 14:55:36 -08004222 lock_sock(sk);
Johann Baudy69e3c752009-05-18 22:11:22 -07004223
4224 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4225 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4226
4227 err = -EBUSY;
4228 if (!closing) {
4229 if (atomic_read(&po->mapped))
4230 goto out;
Daniel Borkmannb0138402014-01-15 16:25:36 +01004231 if (packet_read_pending(rb))
Johann Baudy69e3c752009-05-18 22:11:22 -07004232 goto out;
4233 }
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09004234
Linus Torvalds1da177e2005-04-16 15:20:36 -07004235 if (req->tp_block_nr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004236 /* Sanity tests and some calculations */
Johann Baudy69e3c752009-05-18 22:11:22 -07004237 err = -EBUSY;
4238 if (unlikely(rb->pg_vec))
4239 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004240
Patrick McHardybbd6ef82008-07-14 22:50:15 -07004241 switch (po->tp_version) {
4242 case TPACKET_V1:
4243 po->tp_hdrlen = TPACKET_HDRLEN;
4244 break;
4245 case TPACKET_V2:
4246 po->tp_hdrlen = TPACKET2_HDRLEN;
4247 break;
chetan lokef6fb8f102011-08-19 10:18:16 +00004248 case TPACKET_V3:
4249 po->tp_hdrlen = TPACKET3_HDRLEN;
4250 break;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07004251 }
4252
Johann Baudy69e3c752009-05-18 22:11:22 -07004253 err = -EINVAL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004254 if (unlikely((int)req->tp_block_size <= 0))
Johann Baudy69e3c752009-05-18 22:11:22 -07004255 goto out;
Tobias Klauser90836b62015-11-17 10:40:21 +01004256 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
Johann Baudy69e3c752009-05-18 22:11:22 -07004257 goto out;
Eric Dumazetdc808112014-08-15 09:16:04 -07004258 if (po->tp_version >= TPACKET_V3 &&
Andrey Konovalov2b6867c2017-03-29 16:11:20 +02004259 req->tp_block_size <=
4260 BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv))
Eric Dumazetdc808112014-08-15 09:16:04 -07004261 goto out;
Patrick McHardy8913336a2008-07-18 18:05:19 -07004262 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
Johann Baudy69e3c752009-05-18 22:11:22 -07004263 po->tp_reserve))
4264 goto out;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004265 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
Johann Baudy69e3c752009-05-18 22:11:22 -07004266 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004267
Tobias Klauser4194b492015-11-17 10:38:36 +01004268 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4269 if (unlikely(rb->frames_per_block == 0))
Johann Baudy69e3c752009-05-18 22:11:22 -07004270 goto out;
Andrey Konovalov8f8d28e2017-03-29 16:11:21 +02004271 if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr))
4272 goto out;
Johann Baudy69e3c752009-05-18 22:11:22 -07004273 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4274 req->tp_frame_nr))
4275 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004276
4277 err = -ENOMEM;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004278 order = get_order(req->tp_block_size);
4279 pg_vec = alloc_pg_vec(req, order);
4280 if (unlikely(!pg_vec))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004281 goto out;
chetan lokef6fb8f102011-08-19 10:18:16 +00004282 switch (po->tp_version) {
4283 case TPACKET_V3:
Sowmini Varadhan7f953ab2017-01-03 06:31:47 -08004284 /* Block transmit is not supported yet */
4285 if (!tx_ring) {
Maninder Singhe8e85cc2015-06-22 12:39:16 +05304286 init_prb_bdqc(po, rb, pg_vec, req_u);
Sowmini Varadhan7f953ab2017-01-03 06:31:47 -08004287 } else {
4288 struct tpacket_req3 *req3 = &req_u->req3;
4289
4290 if (req3->tp_retire_blk_tov ||
4291 req3->tp_sizeof_priv ||
4292 req3->tp_feature_req_word) {
4293 err = -EINVAL;
4294 goto out;
4295 }
4296 }
Dan Carpenterd7cf0c32014-02-18 15:20:51 +03004297 break;
chetan lokef6fb8f102011-08-19 10:18:16 +00004298 default:
4299 break;
4300 }
Johann Baudy69e3c752009-05-18 22:11:22 -07004301 }
4302 /* Done */
4303 else {
4304 err = -EINVAL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004305 if (unlikely(req->tp_frame_nr))
Johann Baudy69e3c752009-05-18 22:11:22 -07004306 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004307 }
4308
Linus Torvalds1da177e2005-04-16 15:20:36 -07004309
4310 /* Detach socket from network */
4311 spin_lock(&po->bind_lock);
4312 was_running = po->running;
4313 num = po->num;
4314 if (was_running) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004315 po->num = 0;
David S. Millerce06b032011-07-04 01:44:29 -07004316 __unregister_prot_hook(sk, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004317 }
4318 spin_unlock(&po->bind_lock);
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09004319
Linus Torvalds1da177e2005-04-16 15:20:36 -07004320 synchronize_net();
4321
4322 err = -EBUSY;
Herbert Xu905db442009-01-30 14:12:06 -08004323 mutex_lock(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004324 if (closing || atomic_read(&po->mapped) == 0) {
4325 err = 0;
Johann Baudy69e3c752009-05-18 22:11:22 -07004326 spin_lock_bh(&rb_queue->lock);
Changli Gaoc053fd92010-12-10 16:02:20 -08004327 swap(rb->pg_vec, pg_vec);
Johann Baudy69e3c752009-05-18 22:11:22 -07004328 rb->frame_max = (req->tp_frame_nr - 1);
4329 rb->head = 0;
4330 rb->frame_size = req->tp_frame_size;
4331 spin_unlock_bh(&rb_queue->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004332
Changli Gaoc053fd92010-12-10 16:02:20 -08004333 swap(rb->pg_vec_order, order);
4334 swap(rb->pg_vec_len, req->tp_block_nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004335
Johann Baudy69e3c752009-05-18 22:11:22 -07004336 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4337 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4338 tpacket_rcv : packet_rcv;
4339 skb_queue_purge(rb_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004340 if (atomic_read(&po->mapped))
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004341 pr_err("packet_mmap: vma is busy: %d\n",
4342 atomic_read(&po->mapped));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004343 }
Herbert Xu905db442009-01-30 14:12:06 -08004344 mutex_unlock(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004345
4346 spin_lock(&po->bind_lock);
David S. Millerce06b032011-07-04 01:44:29 -07004347 if (was_running) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004348 po->num = num;
David S. Millerce06b032011-07-04 01:44:29 -07004349 register_prot_hook(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004350 }
4351 spin_unlock(&po->bind_lock);
WANG Congc800aaf2017-07-24 10:07:32 -07004352 if (pg_vec && (po->tp_version > TPACKET_V2)) {
chetan lokef6fb8f102011-08-19 10:18:16 +00004353 /* Because we don't support block-based V3 on tx-ring */
4354 if (!tx_ring)
Tobias Klauser73d0fcf2015-07-28 14:21:26 +02004355 prb_shutdown_retire_blk_timer(po, rb_queue);
chetan lokef6fb8f102011-08-19 10:18:16 +00004356 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004357
Linus Torvalds1da177e2005-04-16 15:20:36 -07004358 if (pg_vec)
4359 free_pg_vec(pg_vec, order, req->tp_block_nr);
4360out:
Philip Pettersson84ac7262016-11-30 14:55:36 -08004361 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004362 return err;
4363}
4364
Johann Baudy69e3c752009-05-18 22:11:22 -07004365static int packet_mmap(struct file *file, struct socket *sock,
4366 struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004367{
4368 struct sock *sk = sock->sk;
4369 struct packet_sock *po = pkt_sk(sk);
Johann Baudy69e3c752009-05-18 22:11:22 -07004370 unsigned long size, expected_size;
4371 struct packet_ring_buffer *rb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004372 unsigned long start;
4373 int err = -EINVAL;
4374 int i;
4375
4376 if (vma->vm_pgoff)
4377 return -EINVAL;
4378
Herbert Xu905db442009-01-30 14:12:06 -08004379 mutex_lock(&po->pg_vec_lock);
Johann Baudy69e3c752009-05-18 22:11:22 -07004380
4381 expected_size = 0;
4382 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4383 if (rb->pg_vec) {
4384 expected_size += rb->pg_vec_len
4385 * rb->pg_vec_pages
4386 * PAGE_SIZE;
4387 }
4388 }
4389
4390 if (expected_size == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004391 goto out;
Johann Baudy69e3c752009-05-18 22:11:22 -07004392
4393 size = vma->vm_end - vma->vm_start;
4394 if (size != expected_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004395 goto out;
4396
Linus Torvalds1da177e2005-04-16 15:20:36 -07004397 start = vma->vm_start;
Johann Baudy69e3c752009-05-18 22:11:22 -07004398 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4399 if (rb->pg_vec == NULL)
4400 continue;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004401
Johann Baudy69e3c752009-05-18 22:11:22 -07004402 for (i = 0; i < rb->pg_vec_len; i++) {
Neil Horman0e3125c2010-11-16 10:26:47 -08004403 struct page *page;
4404 void *kaddr = rb->pg_vec[i].buffer;
Johann Baudy69e3c752009-05-18 22:11:22 -07004405 int pg_num;
4406
Changli Gaoc56b4d92010-12-01 02:52:57 +00004407 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4408 page = pgv_to_page(kaddr);
Johann Baudy69e3c752009-05-18 22:11:22 -07004409 err = vm_insert_page(vma, start, page);
4410 if (unlikely(err))
4411 goto out;
4412 start += PAGE_SIZE;
Neil Horman0e3125c2010-11-16 10:26:47 -08004413 kaddr += PAGE_SIZE;
Johann Baudy69e3c752009-05-18 22:11:22 -07004414 }
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004415 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07004416 }
Johann Baudy69e3c752009-05-18 22:11:22 -07004417
David S. Miller4ebf0ae2005-12-06 16:38:35 -08004418 atomic_inc(&po->mapped);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004419 vma->vm_ops = &packet_mmap_ops;
4420 err = 0;
4421
4422out:
Herbert Xu905db442009-01-30 14:12:06 -08004423 mutex_unlock(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004424 return err;
4425}
Linus Torvalds1da177e2005-04-16 15:20:36 -07004426
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08004427static const struct proto_ops packet_ops_spkt = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004428 .family = PF_PACKET,
4429 .owner = THIS_MODULE,
4430 .release = packet_release,
4431 .bind = packet_bind_spkt,
4432 .connect = sock_no_connect,
4433 .socketpair = sock_no_socketpair,
4434 .accept = sock_no_accept,
4435 .getname = packet_getname_spkt,
4436 .poll = datagram_poll,
4437 .ioctl = packet_ioctl,
4438 .listen = sock_no_listen,
4439 .shutdown = sock_no_shutdown,
4440 .setsockopt = sock_no_setsockopt,
4441 .getsockopt = sock_no_getsockopt,
4442 .sendmsg = packet_sendmsg_spkt,
4443 .recvmsg = packet_recvmsg,
4444 .mmap = sock_no_mmap,
4445 .sendpage = sock_no_sendpage,
4446};
Linus Torvalds1da177e2005-04-16 15:20:36 -07004447
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08004448static const struct proto_ops packet_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004449 .family = PF_PACKET,
4450 .owner = THIS_MODULE,
4451 .release = packet_release,
4452 .bind = packet_bind,
4453 .connect = sock_no_connect,
4454 .socketpair = sock_no_socketpair,
4455 .accept = sock_no_accept,
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09004456 .getname = packet_getname,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004457 .poll = packet_poll,
4458 .ioctl = packet_ioctl,
4459 .listen = sock_no_listen,
4460 .shutdown = sock_no_shutdown,
4461 .setsockopt = packet_setsockopt,
4462 .getsockopt = packet_getsockopt,
Willem de Bruijn719c44d2016-06-07 12:06:34 -04004463#ifdef CONFIG_COMPAT
4464 .compat_setsockopt = compat_packet_setsockopt,
4465#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07004466 .sendmsg = packet_sendmsg,
4467 .recvmsg = packet_recvmsg,
4468 .mmap = packet_mmap,
4469 .sendpage = sock_no_sendpage,
4470};
4471
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00004472static const struct net_proto_family packet_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004473 .family = PF_PACKET,
4474 .create = packet_create,
4475 .owner = THIS_MODULE,
4476};
4477
4478static struct notifier_block packet_netdev_notifier = {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004479 .notifier_call = packet_notifier,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004480};
4481
4482#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07004483
4484static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
stephen hemminger808f5112010-02-22 07:57:18 +00004485 __acquires(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004486{
Denis V. Luneve372c412007-11-19 22:31:54 -08004487 struct net *net = seq_file_net(seq);
stephen hemminger808f5112010-02-22 07:57:18 +00004488
4489 rcu_read_lock();
4490 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004491}
4492
4493static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4494{
Herbert Xu1bf40952007-12-16 14:04:02 -08004495 struct net *net = seq_file_net(seq);
stephen hemminger808f5112010-02-22 07:57:18 +00004496 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004497}
4498
4499static void packet_seq_stop(struct seq_file *seq, void *v)
stephen hemminger808f5112010-02-22 07:57:18 +00004500 __releases(RCU)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004501{
stephen hemminger808f5112010-02-22 07:57:18 +00004502 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004503}
4504
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09004505static int packet_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004506{
4507 if (v == SEQ_START_TOKEN)
4508 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4509 else {
Li Zefanb7ceabd2010-02-08 23:19:29 +00004510 struct sock *s = sk_entry(v);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004511 const struct packet_sock *po = pkt_sk(s);
4512
4513 seq_printf(seq,
Dan Rosenberg71338aa2011-05-23 12:17:35 +00004514 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07004515 s,
Reshetova, Elena41c6d652017-06-30 13:08:01 +03004516 refcount_read(&s->sk_refcnt),
Linus Torvalds1da177e2005-04-16 15:20:36 -07004517 s->sk_type,
4518 ntohs(po->num),
4519 po->ifindex,
4520 po->running,
4521 atomic_read(&s->sk_rmem_alloc),
Eric W. Biedermana7cb5a42012-05-24 01:10:10 -06004522 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00004523 sock_i_ino(s));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004524 }
4525
4526 return 0;
4527}
4528
Philippe De Muyter56b3d972007-07-10 23:07:31 -07004529static const struct seq_operations packet_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004530 .start = packet_seq_start,
4531 .next = packet_seq_next,
4532 .stop = packet_seq_stop,
4533 .show = packet_seq_show,
4534};
4535
4536static int packet_seq_open(struct inode *inode, struct file *file)
4537{
Denis V. Luneve372c412007-11-19 22:31:54 -08004538 return seq_open_net(inode, file, &packet_seq_ops,
4539 sizeof(struct seq_net_private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004540}
4541
Arjan van de Venda7071d2007-02-12 00:55:36 -08004542static const struct file_operations packet_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004543 .owner = THIS_MODULE,
4544 .open = packet_seq_open,
4545 .read = seq_read,
4546 .llseek = seq_lseek,
Denis V. Luneve372c412007-11-19 22:31:54 -08004547 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004548};
4549
4550#endif
4551
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00004552static int __net_init packet_net_init(struct net *net)
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08004553{
Pavel Emelyanov0fa7fa92012-08-21 01:06:47 +00004554 mutex_init(&net->packet.sklist_lock);
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08004555 INIT_HLIST_HEAD(&net->packet.sklist);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08004556
Gao fengd4beaa62013-02-18 01:34:54 +00004557 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08004558 return -ENOMEM;
4559
4560 return 0;
4561}
4562
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00004563static void __net_exit packet_net_exit(struct net *net)
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08004564{
Gao fengece31ff2013-02-18 01:34:56 +00004565 remove_proc_entry("packet", net->proc_net);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08004566}
4567
4568static struct pernet_operations packet_net_ops = {
4569 .init = packet_net_init,
4570 .exit = packet_net_exit,
4571};
4572
4573
Linus Torvalds1da177e2005-04-16 15:20:36 -07004574static void __exit packet_exit(void)
4575{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004576 unregister_netdevice_notifier(&packet_netdev_notifier);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08004577 unregister_pernet_subsys(&packet_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004578 sock_unregister(PF_PACKET);
4579 proto_unregister(&packet_proto);
4580}
4581
4582static int __init packet_init(void)
4583{
4584 int rc = proto_register(&packet_proto, 0);
4585
4586 if (rc != 0)
4587 goto out;
4588
4589 sock_register(&packet_family_ops);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08004590 register_pernet_subsys(&packet_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004591 register_netdevice_notifier(&packet_netdev_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004592out:
4593 return rc;
4594}
4595
4596module_init(packet_init);
4597module_exit(packet_exit);
4598MODULE_LICENSE("GPL");
4599MODULE_ALIAS_NETPROTO(PF_PACKET);