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Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001/*
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 * "Ping" sockets
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 * Based on ipv4/udp.c code.
14 *
15 * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6),
16 * Pavel Kankovsky (for Linux 2.4.32)
17 *
18 * Pavel gave all rights to bugs to Vasiliy,
19 * none of the bugs are Pavel's now.
20 *
21 */
22
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000023#include <linux/uaccess.h>
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000024#include <linux/types.h>
25#include <linux/fcntl.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
28#include <linux/in.h>
29#include <linux/errno.h>
30#include <linux/timer.h>
31#include <linux/mm.h>
32#include <linux/inet.h>
33#include <linux/netdevice.h>
34#include <net/snmp.h>
35#include <net/ip.h>
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000036#include <net/icmp.h>
37#include <net/protocol.h>
38#include <linux/skbuff.h>
39#include <linux/proc_fs.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040040#include <linux/export.h>
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000041#include <net/sock.h>
42#include <net/ping.h>
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000043#include <net/udp.h>
44#include <net/route.h>
45#include <net/inet_common.h>
46#include <net/checksum.h>
47
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000048#if IS_ENABLED(CONFIG_IPV6)
49#include <linux/in6.h>
50#include <linux/icmpv6.h>
51#include <net/addrconf.h>
52#include <net/ipv6.h>
53#include <net/transp_v6.h>
54#endif
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000055
Stephen Hemmingerea074b32013-12-28 11:11:42 -080056struct ping_table {
57 struct hlist_nulls_head hash[PING_HTABLE_SIZE];
58 rwlock_t lock;
59};
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000060
Stephen Hemmingerea074b32013-12-28 11:11:42 -080061static struct ping_table ping_table;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000062struct pingv6_ops pingv6_ops;
63EXPORT_SYMBOL_GPL(pingv6_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000064
Eric Dumazet1b1cb1f2011-05-13 22:59:19 +000065static u16 ping_port_rover;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000066
Eric Dumazet95c96172012-04-15 05:58:06 +000067static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000068{
69 int res = (num + net_hash_mix(net)) & mask;
Eric Dumazet95c96172012-04-15 05:58:06 +000070
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000071 pr_debug("hash(%d) = %d\n", num, res);
72 return res;
73}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000074EXPORT_SYMBOL_GPL(ping_hash);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000075
76static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
Eric Dumazet95c96172012-04-15 05:58:06 +000077 struct net *net, unsigned int num)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000078{
79 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
80}
81
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000082int ping_get_port(struct sock *sk, unsigned short ident)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000083{
84 struct hlist_nulls_node *node;
85 struct hlist_nulls_head *hlist;
86 struct inet_sock *isk, *isk2;
87 struct sock *sk2 = NULL;
88
89 isk = inet_sk(sk);
90 write_lock_bh(&ping_table.lock);
91 if (ident == 0) {
92 u32 i;
93 u16 result = ping_port_rover + 1;
94
95 for (i = 0; i < (1L << 16); i++, result++) {
96 if (!result)
97 result++; /* avoid zero */
98 hlist = ping_hashslot(&ping_table, sock_net(sk),
99 result);
100 ping_portaddr_for_each_entry(sk2, node, hlist) {
101 isk2 = inet_sk(sk2);
102
103 if (isk2->inet_num == result)
104 goto next_port;
105 }
106
107 /* found */
108 ping_port_rover = ident = result;
109 break;
110next_port:
111 ;
112 }
113 if (i >= (1L << 16))
114 goto fail;
115 } else {
116 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
117 ping_portaddr_for_each_entry(sk2, node, hlist) {
118 isk2 = inet_sk(sk2);
119
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000120 /* BUG? Why is this reuse and not reuseaddr? ping.c
121 * doesn't turn off SO_REUSEADDR, and it doesn't expect
122 * that other ping processes can steal its packets.
123 */
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000124 if ((isk2->inet_num == ident) &&
125 (sk2 != sk) &&
126 (!sk2->sk_reuse || !sk->sk_reuse))
127 goto fail;
128 }
129 }
130
131 pr_debug("found port/ident = %d\n", ident);
132 isk->inet_num = ident;
133 if (sk_unhashed(sk)) {
134 pr_debug("was not hashed\n");
135 sock_hold(sk);
136 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
137 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
138 }
139 write_unlock_bh(&ping_table.lock);
140 return 0;
141
142fail:
143 write_unlock_bh(&ping_table.lock);
144 return 1;
145}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000146EXPORT_SYMBOL_GPL(ping_get_port);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000147
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000148void ping_hash(struct sock *sk)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000149{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000150 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000151 BUG(); /* "Please do not press this button again." */
152}
153
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000154void ping_unhash(struct sock *sk)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000155{
156 struct inet_sock *isk = inet_sk(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000157 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000158 if (sk_hashed(sk)) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000159 write_lock_bh(&ping_table.lock);
160 hlist_nulls_del(&sk->sk_nulls_node);
161 sock_put(sk);
Eric Dumazet747465e2012-01-16 19:27:39 +0000162 isk->inet_num = 0;
163 isk->inet_sport = 0;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000164 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
165 write_unlock_bh(&ping_table.lock);
166 }
167}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000168EXPORT_SYMBOL_GPL(ping_unhash);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000169
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000170static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000171{
172 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
173 struct sock *sk = NULL;
174 struct inet_sock *isk;
175 struct hlist_nulls_node *hnode;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000176 int dif = skb->dev->ifindex;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000177
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000178 if (skb->protocol == htons(ETH_P_IP)) {
179 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
180 (int)ident, &ip_hdr(skb)->daddr, dif);
181#if IS_ENABLED(CONFIG_IPV6)
182 } else if (skb->protocol == htons(ETH_P_IPV6)) {
183 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
184 (int)ident, &ipv6_hdr(skb)->daddr, dif);
185#endif
186 }
187
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000188 read_lock_bh(&ping_table.lock);
189
190 ping_portaddr_for_each_entry(sk, hnode, hslot) {
191 isk = inet_sk(sk);
192
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000193 pr_debug("iterate\n");
194 if (isk->inet_num != ident)
195 continue;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000196
197 if (skb->protocol == htons(ETH_P_IP) &&
198 sk->sk_family == AF_INET) {
199 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
200 (int) isk->inet_num, &isk->inet_rcv_saddr,
201 sk->sk_bound_dev_if);
202
203 if (isk->inet_rcv_saddr &&
204 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
205 continue;
206#if IS_ENABLED(CONFIG_IPV6)
207 } else if (skb->protocol == htons(ETH_P_IPV6) &&
208 sk->sk_family == AF_INET6) {
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000209
210 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
211 (int) isk->inet_num,
Eric Dumazetefe42082013-10-03 15:42:29 -0700212 &sk->sk_v6_rcv_saddr,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000213 sk->sk_bound_dev_if);
214
Eric Dumazetefe42082013-10-03 15:42:29 -0700215 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
216 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000217 &ipv6_hdr(skb)->daddr))
218 continue;
219#endif
Jane Zhou91a0b602014-11-24 11:44:08 -0800220 } else {
221 continue;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000222 }
223
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000224 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
225 continue;
226
227 sock_hold(sk);
228 goto exit;
229 }
230
231 sk = NULL;
232exit:
233 read_unlock_bh(&ping_table.lock);
234
235 return sk;
236}
237
Eric W. Biederman7064d162012-05-24 10:34:21 -0600238static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
239 kgid_t *high)
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000240{
Cong Wangba6b9182014-05-06 11:02:50 -0700241 kgid_t *data = net->ipv4.ping_group_range.range;
Eric Dumazet95c96172012-04-15 05:58:06 +0000242 unsigned int seq;
243
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000244 do {
Cong Wangba6b9182014-05-06 11:02:50 -0700245 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000246
247 *low = data[0];
248 *high = data[1];
Cong Wangba6b9182014-05-06 11:02:50 -0700249 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000250}
251
252
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000253int ping_init_sock(struct sock *sk)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000254{
255 struct net *net = sock_net(sk);
Eric W. Biederman7064d162012-05-24 10:34:21 -0600256 kgid_t group = current_egid();
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400257 struct group_info *group_info;
258 int i, j, count;
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800259 kgid_t low, high;
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400260 int ret = 0;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000261
Lorenzo Colitti91457362015-03-03 23:16:16 +0900262 if (sk->sk_family == AF_INET6)
263 sk->sk_ipv6only = 1;
264
Eric W. Biederman7064d162012-05-24 10:34:21 -0600265 inet_get_ping_group_range_net(net, &low, &high);
266 if (gid_lte(low, group) && gid_lte(group, high))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000267 return 0;
268
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400269 group_info = get_current_groups();
270 count = group_info->ngroups;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000271 for (i = 0; i < group_info->nblocks; i++) {
272 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000273 for (j = 0; j < cp_count; j++) {
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800274 kgid_t gid = group_info->blocks[i][j];
275 if (gid_lte(low, gid) && gid_lte(gid, high))
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400276 goto out_release_group;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000277 }
278
279 count -= cp_count;
280 }
281
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400282 ret = -EACCES;
283
284out_release_group:
285 put_group_info(group_info);
286 return ret;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000287}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000288EXPORT_SYMBOL_GPL(ping_init_sock);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000289
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000290void ping_close(struct sock *sk, long timeout)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000291{
292 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000293 inet_sk(sk), inet_sk(sk)->inet_num);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000294 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
295
296 sk_common_release(sk);
297}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000298EXPORT_SYMBOL_GPL(ping_close);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000299
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000300/* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800301static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
302 struct sockaddr *uaddr, int addr_len) {
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000303 struct net *net = sock_net(sk);
304 if (sk->sk_family == AF_INET) {
305 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
306 int chk_addr_ret;
307
308 if (addr_len < sizeof(*addr))
309 return -EINVAL;
310
Lorenzo Colitti91457362015-03-03 23:16:16 +0900311 if (addr->sin_family != AF_INET &&
312 !(addr->sin_family == AF_UNSPEC &&
313 addr->sin_addr.s_addr == htonl(INADDR_ANY)))
314 return -EAFNOSUPPORT;
315
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000316 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
317 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
318
319 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
320
321 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
322 chk_addr_ret = RTN_LOCAL;
323
Vincent Bernat49a60152014-09-05 15:09:03 +0200324 if ((net->ipv4.sysctl_ip_nonlocal_bind == 0 &&
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000325 isk->freebind == 0 && isk->transparent == 0 &&
326 chk_addr_ret != RTN_LOCAL) ||
327 chk_addr_ret == RTN_MULTICAST ||
328 chk_addr_ret == RTN_BROADCAST)
329 return -EADDRNOTAVAIL;
330
331#if IS_ENABLED(CONFIG_IPV6)
332 } else if (sk->sk_family == AF_INET6) {
333 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
334 int addr_type, scoped, has_addr;
335 struct net_device *dev = NULL;
336
337 if (addr_len < sizeof(*addr))
338 return -EINVAL;
339
Hannes Frederic Sowa82b276c2014-01-20 05:16:39 +0100340 if (addr->sin6_family != AF_INET6)
Lorenzo Colitti91457362015-03-03 23:16:16 +0900341 return -EAFNOSUPPORT;
Hannes Frederic Sowa82b276c2014-01-20 05:16:39 +0100342
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000343 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
344 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
345
346 addr_type = ipv6_addr_type(&addr->sin6_addr);
347 scoped = __ipv6_addr_needs_scope_id(addr_type);
348 if ((addr_type != IPV6_ADDR_ANY &&
349 !(addr_type & IPV6_ADDR_UNICAST)) ||
350 (scoped && !addr->sin6_scope_id))
351 return -EINVAL;
352
353 rcu_read_lock();
354 if (addr->sin6_scope_id) {
355 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
356 if (!dev) {
357 rcu_read_unlock();
358 return -ENODEV;
359 }
360 }
361 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
362 scoped);
363 rcu_read_unlock();
364
365 if (!(isk->freebind || isk->transparent || has_addr ||
366 addr_type == IPV6_ADDR_ANY))
367 return -EADDRNOTAVAIL;
368
369 if (scoped)
370 sk->sk_bound_dev_if = addr->sin6_scope_id;
371#endif
372 } else {
373 return -EAFNOSUPPORT;
374 }
375 return 0;
376}
377
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800378static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000379{
380 if (saddr->sa_family == AF_INET) {
381 struct inet_sock *isk = inet_sk(sk);
382 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
383 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
384#if IS_ENABLED(CONFIG_IPV6)
385 } else if (saddr->sa_family == AF_INET6) {
386 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
387 struct ipv6_pinfo *np = inet6_sk(sk);
Eric Dumazetefe42082013-10-03 15:42:29 -0700388 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000389#endif
390 }
391}
392
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800393static void ping_clear_saddr(struct sock *sk, int dif)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000394{
395 sk->sk_bound_dev_if = dif;
396 if (sk->sk_family == AF_INET) {
397 struct inet_sock *isk = inet_sk(sk);
398 isk->inet_rcv_saddr = isk->inet_saddr = 0;
399#if IS_ENABLED(CONFIG_IPV6)
400 } else if (sk->sk_family == AF_INET6) {
401 struct ipv6_pinfo *np = inet6_sk(sk);
Eric Dumazetefe42082013-10-03 15:42:29 -0700402 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000403 memset(&np->saddr, 0, sizeof(np->saddr));
404#endif
405 }
406}
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000407/*
408 * We need our own bind because there are no privileged id's == local ports.
409 * Moreover, we don't allow binding to multi- and broadcast addresses.
410 */
411
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000412int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000413{
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000414 struct inet_sock *isk = inet_sk(sk);
415 unsigned short snum;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000416 int err;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000417 int dif = sk->sk_bound_dev_if;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000418
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000419 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
420 if (err)
421 return err;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000422
423 lock_sock(sk);
424
425 err = -EINVAL;
426 if (isk->inet_num != 0)
427 goto out;
428
429 err = -EADDRINUSE;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000430 ping_set_saddr(sk, uaddr);
431 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
432 if (ping_get_port(sk, snum) != 0) {
433 ping_clear_saddr(sk, dif);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000434 goto out;
435 }
436
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000437 pr_debug("after bind(): num = %d, dif = %d\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000438 (int)isk->inet_num,
Joe Perches058bd4d2012-03-11 18:36:11 +0000439 (int)sk->sk_bound_dev_if);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000440
441 err = 0;
Eric Dumazetc2bb06d2013-10-09 03:05:48 -0700442 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000443 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
Eric Dumazetc2bb06d2013-10-09 03:05:48 -0700444#if IS_ENABLED(CONFIG_IPV6)
445 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
446 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
447#endif
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000448
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000449 if (snum)
450 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
451 isk->inet_sport = htons(isk->inet_num);
452 isk->inet_daddr = 0;
453 isk->inet_dport = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000454
455#if IS_ENABLED(CONFIG_IPV6)
456 if (sk->sk_family == AF_INET6)
Eric Dumazetefe42082013-10-03 15:42:29 -0700457 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000458#endif
459
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000460 sk_dst_reset(sk);
461out:
462 release_sock(sk);
463 pr_debug("ping_v4_bind -> %d\n", err);
464 return err;
465}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000466EXPORT_SYMBOL_GPL(ping_bind);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000467
468/*
469 * Is this a supported type of ICMP message?
470 */
471
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000472static inline int ping_supported(int family, int type, int code)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000473{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000474 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
475 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000476}
477
478/*
479 * This routine is called by the ICMP module when it gets some
480 * sort of error condition.
481 */
482
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000483void ping_err(struct sk_buff *skb, int offset, u32 info)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000484{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000485 int family;
486 struct icmphdr *icmph;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000487 struct inet_sock *inet_sock;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000488 int type;
489 int code;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000490 struct net *net = dev_net(skb->dev);
491 struct sock *sk;
492 int harderr;
493 int err;
494
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000495 if (skb->protocol == htons(ETH_P_IP)) {
496 family = AF_INET;
497 type = icmp_hdr(skb)->type;
498 code = icmp_hdr(skb)->code;
499 icmph = (struct icmphdr *)(skb->data + offset);
500 } else if (skb->protocol == htons(ETH_P_IPV6)) {
501 family = AF_INET6;
502 type = icmp6_hdr(skb)->icmp6_type;
503 code = icmp6_hdr(skb)->icmp6_code;
504 icmph = (struct icmphdr *) (skb->data + offset);
505 } else {
506 BUG();
507 }
508
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000509 /* We assume the packet has already been checked by icmp_unreach */
510
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000511 if (!ping_supported(family, icmph->type, icmph->code))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000512 return;
513
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000514 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
515 skb->protocol, type, code, ntohs(icmph->un.echo.id),
516 ntohs(icmph->un.echo.sequence));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000517
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000518 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000519 if (sk == NULL) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000520 pr_debug("no socket, dropping\n");
521 return; /* No socket for error */
522 }
523 pr_debug("err on socket %p\n", sk);
524
525 err = 0;
526 harderr = 0;
527 inet_sock = inet_sk(sk);
528
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000529 if (skb->protocol == htons(ETH_P_IP)) {
530 switch (type) {
531 default:
532 case ICMP_TIME_EXCEEDED:
533 err = EHOSTUNREACH;
534 break;
535 case ICMP_SOURCE_QUENCH:
536 /* This is not a real error but ping wants to see it.
537 * Report it with some fake errno.
538 */
539 err = EREMOTEIO;
540 break;
541 case ICMP_PARAMETERPROB:
542 err = EPROTO;
543 harderr = 1;
544 break;
545 case ICMP_DEST_UNREACH:
546 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
547 ipv4_sk_update_pmtu(skb, sk, info);
548 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
549 err = EMSGSIZE;
550 harderr = 1;
551 break;
552 }
553 goto out;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000554 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000555 err = EHOSTUNREACH;
556 if (code <= NR_ICMP_UNREACH) {
557 harderr = icmp_err_convert[code].fatal;
558 err = icmp_err_convert[code].errno;
559 }
560 break;
561 case ICMP_REDIRECT:
562 /* See ICMP_SOURCE_QUENCH */
563 ipv4_sk_redirect(skb, sk);
564 err = EREMOTEIO;
565 break;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000566 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000567#if IS_ENABLED(CONFIG_IPV6)
568 } else if (skb->protocol == htons(ETH_P_IPV6)) {
569 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
570#endif
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000571 }
572
573 /*
574 * RFC1122: OK. Passes ICMP errors back to application, as per
575 * 4.1.3.3.
576 */
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000577 if ((family == AF_INET && !inet_sock->recverr) ||
578 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000579 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
580 goto out;
581 } else {
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000582 if (family == AF_INET) {
583 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
584 info, (u8 *)icmph);
585#if IS_ENABLED(CONFIG_IPV6)
586 } else if (family == AF_INET6) {
587 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
588 info, (u8 *)icmph);
589#endif
590 }
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000591 }
592 sk->sk_err = err;
593 sk->sk_error_report(sk);
594out:
595 sock_put(sk);
596}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000597EXPORT_SYMBOL_GPL(ping_err);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000598
599/*
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000600 * Copy and checksum an ICMP Echo packet from user space into a buffer
601 * starting from the payload.
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000602 */
603
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000604int ping_getfrag(void *from, char *to,
605 int offset, int fraglen, int odd, struct sk_buff *skb)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000606{
607 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
608
609 if (offset == 0) {
Al Viro21226ab2014-11-28 15:48:29 -0500610 fraglen -= sizeof(struct icmphdr);
611 if (fraglen < 0)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000612 BUG();
Al Viro21226ab2014-11-28 15:48:29 -0500613 if (csum_and_copy_from_iter(to + sizeof(struct icmphdr),
614 fraglen, &pfh->wcheck,
615 &pfh->msg->msg_iter) != fraglen)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000616 return -EFAULT;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000617 } else if (offset < sizeof(struct icmphdr)) {
618 BUG();
619 } else {
Al Viro21226ab2014-11-28 15:48:29 -0500620 if (csum_and_copy_from_iter(to, fraglen, &pfh->wcheck,
621 &pfh->msg->msg_iter) != fraglen)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000622 return -EFAULT;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000623 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000624
625#if IS_ENABLED(CONFIG_IPV6)
626 /* For IPv6, checksum each skb as we go along, as expected by
627 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
628 * wcheck, it will be finalized in ping_v4_push_pending_frames.
629 */
630 if (pfh->family == AF_INET6) {
631 skb->csum = pfh->wcheck;
632 skb->ip_summed = CHECKSUM_NONE;
633 pfh->wcheck = 0;
634 }
635#endif
636
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000637 return 0;
638}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000639EXPORT_SYMBOL_GPL(ping_getfrag);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000640
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000641static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
642 struct flowi4 *fl4)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000643{
644 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
645
646 pfh->wcheck = csum_partial((char *)&pfh->icmph,
647 sizeof(struct icmphdr), pfh->wcheck);
648 pfh->icmph.checksum = csum_fold(pfh->wcheck);
649 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
650 skb->ip_summed = CHECKSUM_NONE;
651 return ip_push_pending_frames(sk, fl4);
652}
653
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000654int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
655 void *user_icmph, size_t icmph_len) {
656 u8 type, code;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000657
658 if (len > 0xFFFF)
659 return -EMSGSIZE;
660
661 /*
662 * Check the flags.
663 */
664
665 /* Mirror BSD error message compatibility */
666 if (msg->msg_flags & MSG_OOB)
667 return -EOPNOTSUPP;
668
669 /*
670 * Fetch the ICMP header provided by the userland.
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000671 * iovec is modified! The ICMP header is consumed.
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000672 */
Al Viro6ce8e9c2014-04-06 21:25:44 -0400673 if (memcpy_from_msg(user_icmph, msg, icmph_len))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000674 return -EFAULT;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000675
676 if (family == AF_INET) {
677 type = ((struct icmphdr *) user_icmph)->type;
678 code = ((struct icmphdr *) user_icmph)->code;
679#if IS_ENABLED(CONFIG_IPV6)
680 } else if (family == AF_INET6) {
681 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
682 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
683#endif
684 } else {
685 BUG();
686 }
687
688 if (!ping_supported(family, type, code))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000689 return -EINVAL;
690
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000691 return 0;
692}
693EXPORT_SYMBOL_GPL(ping_common_sendmsg);
694
Ying Xue1b784142015-03-02 15:37:48 +0800695static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000696{
697 struct net *net = sock_net(sk);
698 struct flowi4 fl4;
699 struct inet_sock *inet = inet_sk(sk);
700 struct ipcm_cookie ipc;
701 struct icmphdr user_icmph;
702 struct pingfakehdr pfh;
703 struct rtable *rt = NULL;
704 struct ip_options_data opt_copy;
705 int free = 0;
706 __be32 saddr, daddr, faddr;
707 u8 tos;
708 int err;
709
710 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
711
712 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
713 sizeof(user_icmph));
714 if (err)
715 return err;
716
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000717 /*
718 * Get and verify the address.
719 */
720
721 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100722 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000723 if (msg->msg_namelen < sizeof(*usin))
724 return -EINVAL;
725 if (usin->sin_family != AF_INET)
Lorenzo Colitti91457362015-03-03 23:16:16 +0900726 return -EAFNOSUPPORT;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000727 daddr = usin->sin_addr.s_addr;
728 /* no remote port */
729 } else {
730 if (sk->sk_state != TCP_ESTABLISHED)
731 return -EDESTADDRREQ;
732 daddr = inet->inet_daddr;
733 /* no remote port */
734 }
735
736 ipc.addr = inet->inet_saddr;
737 ipc.opt = NULL;
738 ipc.oif = sk->sk_bound_dev_if;
739 ipc.tx_flags = 0;
Francesco Fuscoaa661582013-09-24 15:43:09 +0200740 ipc.ttl = 0;
741 ipc.tos = -1;
Daniel Borkmannbf84a012013-04-14 08:08:13 +0000742
743 sock_tx_timestamp(sk, &ipc.tx_flags);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000744
745 if (msg->msg_controllen) {
Hannes Frederic Sowac8e6ad02014-02-18 21:38:08 +0100746 err = ip_cmsg_send(sock_net(sk), msg, &ipc, false);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000747 if (err)
748 return err;
749 if (ipc.opt)
750 free = 1;
751 }
752 if (!ipc.opt) {
753 struct ip_options_rcu *inet_opt;
754
755 rcu_read_lock();
756 inet_opt = rcu_dereference(inet->inet_opt);
757 if (inet_opt) {
758 memcpy(&opt_copy, inet_opt,
759 sizeof(*inet_opt) + inet_opt->opt.optlen);
760 ipc.opt = &opt_copy.opt;
761 }
762 rcu_read_unlock();
763 }
764
765 saddr = ipc.addr;
766 ipc.addr = faddr = daddr;
767
768 if (ipc.opt && ipc.opt->opt.srr) {
769 if (!daddr)
770 return -EINVAL;
771 faddr = ipc.opt->opt.faddr;
772 }
Francesco Fuscoaa661582013-09-24 15:43:09 +0200773 tos = get_rttos(&ipc, inet);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000774 if (sock_flag(sk, SOCK_LOCALROUTE) ||
775 (msg->msg_flags & MSG_DONTROUTE) ||
776 (ipc.opt && ipc.opt->opt.is_strictroute)) {
777 tos |= RTO_ONLINK;
778 }
779
780 if (ipv4_is_multicast(daddr)) {
781 if (!ipc.oif)
782 ipc.oif = inet->mc_index;
783 if (!saddr)
784 saddr = inet->mc_addr;
Erich E. Hoover76e21052012-02-08 09:11:07 +0000785 } else if (!ipc.oif)
786 ipc.oif = inet->uc_index;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000787
788 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
789 RT_SCOPE_UNIVERSE, sk->sk_protocol,
790 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
791
792 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
793 rt = ip_route_output_flow(net, &fl4, sk);
794 if (IS_ERR(rt)) {
795 err = PTR_ERR(rt);
796 rt = NULL;
797 if (err == -ENETUNREACH)
Eric Dumazetf1d8cba2013-11-28 09:51:22 -0800798 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000799 goto out;
800 }
801
802 err = -EACCES;
803 if ((rt->rt_flags & RTCF_BROADCAST) &&
804 !sock_flag(sk, SOCK_BROADCAST))
805 goto out;
806
807 if (msg->msg_flags & MSG_CONFIRM)
808 goto do_confirm;
809back_from_confirm:
810
811 if (!ipc.addr)
812 ipc.addr = fl4.daddr;
813
814 lock_sock(sk);
815
816 pfh.icmph.type = user_icmph.type; /* already checked */
817 pfh.icmph.code = user_icmph.code; /* ditto */
818 pfh.icmph.checksum = 0;
819 pfh.icmph.un.echo.id = inet->inet_sport;
820 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
Al Virocacdc7d2014-11-27 20:34:16 -0500821 pfh.msg = msg;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000822 pfh.wcheck = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000823 pfh.family = AF_INET;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000824
825 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
826 0, &ipc, &rt, msg->msg_flags);
827 if (err)
828 ip_flush_pending_frames(sk);
829 else
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000830 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000831 release_sock(sk);
832
833out:
834 ip_rt_put(rt);
835 if (free)
836 kfree(ipc.opt);
837 if (!err) {
838 icmp_out_count(sock_net(sk), user_icmph.type);
839 return len;
840 }
841 return err;
842
843do_confirm:
844 dst_confirm(&rt->dst);
845 if (!(msg->msg_flags & MSG_PROBE) || len)
846 goto back_from_confirm;
847 err = 0;
848 goto out;
849}
850
Ying Xue1b784142015-03-02 15:37:48 +0800851int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
852 int flags, int *addr_len)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000853{
854 struct inet_sock *isk = inet_sk(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000855 int family = sk->sk_family;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000856 struct sk_buff *skb;
857 int copied, err;
858
859 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
860
David S. Millera5e74242012-02-21 17:59:19 -0500861 err = -EOPNOTSUPP;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000862 if (flags & MSG_OOB)
863 goto out;
864
Willem de Bruijnf4713a32014-11-26 14:53:02 -0500865 if (flags & MSG_ERRQUEUE)
866 return inet_recv_error(sk, msg, len, addr_len);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000867
868 skb = skb_recv_datagram(sk, flags, noblock, &err);
869 if (!skb)
870 goto out;
871
872 copied = skb->len;
873 if (copied > len) {
874 msg->msg_flags |= MSG_TRUNC;
875 copied = len;
876 }
877
878 /* Don't bother checking the checksum */
David S. Miller51f3d022014-11-05 16:46:40 -0500879 err = skb_copy_datagram_msg(skb, 0, msg, copied);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000880 if (err)
881 goto done;
882
883 sock_recv_timestamp(msg, sk, skb);
884
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000885 /* Copy the address and add cmsg data. */
886 if (family == AF_INET) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100887 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
Hannes Frederic Sowabceaa902013-11-18 04:20:45 +0100888
Hannes Frederic Sowacf970c02013-11-18 07:07:45 +0100889 if (sin) {
890 sin->sin_family = AF_INET;
891 sin->sin_port = 0 /* skb->h.uh->source */;
892 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
893 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
894 *addr_len = sizeof(*sin);
895 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000896
897 if (isk->cmsg_flags)
898 ip_cmsg_recv(msg, skb);
899
900#if IS_ENABLED(CONFIG_IPV6)
901 } else if (family == AF_INET6) {
902 struct ipv6_pinfo *np = inet6_sk(sk);
903 struct ipv6hdr *ip6 = ipv6_hdr(skb);
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100904 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000905
Hannes Frederic Sowacf970c02013-11-18 07:07:45 +0100906 if (sin6) {
907 sin6->sin6_family = AF_INET6;
908 sin6->sin6_port = 0;
909 sin6->sin6_addr = ip6->saddr;
910 sin6->sin6_flowinfo = 0;
911 if (np->sndflow)
912 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
913 sin6->sin6_scope_id =
914 ipv6_iface_scope_id(&sin6->sin6_addr,
Duan Jiong43304872014-08-01 09:52:58 +0800915 inet6_iif(skb));
Hannes Frederic Sowacf970c02013-11-18 07:07:45 +0100916 *addr_len = sizeof(*sin6);
917 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000918
919 if (inet6_sk(sk)->rxopt.all)
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100920 pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
921 if (skb->protocol == htons(ETH_P_IPV6) &&
922 inet6_sk(sk)->rxopt.all)
923 pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
924 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
925 ip_cmsg_recv(msg, skb);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000926#endif
927 } else {
928 BUG();
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000929 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000930
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000931 err = copied;
932
933done:
934 skb_free_datagram(sk, skb);
935out:
936 pr_debug("ping_recvmsg -> %d\n", err);
937 return err;
938}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000939EXPORT_SYMBOL_GPL(ping_recvmsg);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000940
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000941int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000942{
943 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000944 inet_sk(sk), inet_sk(sk)->inet_num, skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000945 if (sock_queue_rcv_skb(sk, skb) < 0) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000946 kfree_skb(skb);
947 pr_debug("ping_queue_rcv_skb -> failed\n");
948 return -1;
949 }
950 return 0;
951}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000952EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000953
954
955/*
956 * All we need to do is get the socket.
957 */
958
Rick Jonese3e32172014-11-17 14:04:29 -0800959bool ping_rcv(struct sk_buff *skb)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000960{
961 struct sock *sk;
962 struct net *net = dev_net(skb->dev);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000963 struct icmphdr *icmph = icmp_hdr(skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000964
965 /* We assume the packet has already been checked by icmp_rcv */
966
967 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000968 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000969
970 /* Push ICMP header back */
971 skb_push(skb, skb->data - (u8 *)icmph);
972
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000973 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000974 if (sk != NULL) {
subashab@codeaurora.orgfc752f12015-01-23 22:26:02 +0000975 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
976
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000977 pr_debug("rcv on socket %p\n", sk);
subashab@codeaurora.orgfc752f12015-01-23 22:26:02 +0000978 if (skb2)
979 ping_queue_rcv_skb(sk, skb2);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000980 sock_put(sk);
Rick Jonese3e32172014-11-17 14:04:29 -0800981 return true;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000982 }
983 pr_debug("no socket, dropping\n");
984
Rick Jonese3e32172014-11-17 14:04:29 -0800985 return false;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000986}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000987EXPORT_SYMBOL_GPL(ping_rcv);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000988
989struct proto ping_prot = {
990 .name = "PING",
991 .owner = THIS_MODULE,
992 .init = ping_init_sock,
993 .close = ping_close,
994 .connect = ip4_datagram_connect,
995 .disconnect = udp_disconnect,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000996 .setsockopt = ip_setsockopt,
997 .getsockopt = ip_getsockopt,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000998 .sendmsg = ping_v4_sendmsg,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000999 .recvmsg = ping_recvmsg,
1000 .bind = ping_bind,
1001 .backlog_rcv = ping_queue_rcv_skb,
Steffen Klassert8141ed92013-01-21 02:00:03 +00001002 .release_cb = ip4_datagram_release_cb,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +00001003 .hash = ping_hash,
1004 .unhash = ping_unhash,
1005 .get_port = ping_get_port,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001006 .obj_size = sizeof(struct inet_sock),
1007};
1008EXPORT_SYMBOL(ping_prot);
1009
1010#ifdef CONFIG_PROC_FS
1011
1012static struct sock *ping_get_first(struct seq_file *seq, int start)
1013{
1014 struct sock *sk;
1015 struct ping_iter_state *state = seq->private;
1016 struct net *net = seq_file_net(seq);
1017
1018 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1019 ++state->bucket) {
1020 struct hlist_nulls_node *node;
Changli Gao75e308c2011-05-18 21:16:01 +00001021 struct hlist_nulls_head *hslot;
1022
1023 hslot = &ping_table.hash[state->bucket];
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001024
1025 if (hlist_nulls_empty(hslot))
1026 continue;
1027
1028 sk_nulls_for_each(sk, node, hslot) {
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001029 if (net_eq(sock_net(sk), net) &&
1030 sk->sk_family == state->family)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001031 goto found;
1032 }
1033 }
1034 sk = NULL;
1035found:
1036 return sk;
1037}
1038
1039static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1040{
1041 struct ping_iter_state *state = seq->private;
1042 struct net *net = seq_file_net(seq);
1043
1044 do {
1045 sk = sk_nulls_next(sk);
1046 } while (sk && (!net_eq(sock_net(sk), net)));
1047
1048 if (!sk)
1049 return ping_get_first(seq, state->bucket + 1);
1050 return sk;
1051}
1052
1053static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1054{
1055 struct sock *sk = ping_get_first(seq, 0);
1056
1057 if (sk)
1058 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1059 --pos;
1060 return pos ? NULL : sk;
1061}
1062
Lorenzo Colittid862e542013-05-31 15:05:50 +00001063void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001064{
1065 struct ping_iter_state *state = seq->private;
1066 state->bucket = 0;
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001067 state->family = family;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001068
1069 read_lock_bh(&ping_table.lock);
1070
1071 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1072}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001073EXPORT_SYMBOL_GPL(ping_seq_start);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001074
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001075static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1076{
1077 return ping_seq_start(seq, pos, AF_INET);
1078}
1079
Lorenzo Colittid862e542013-05-31 15:05:50 +00001080void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001081{
1082 struct sock *sk;
1083
1084 if (v == SEQ_START_TOKEN)
1085 sk = ping_get_idx(seq, 0);
1086 else
1087 sk = ping_get_next(seq, v);
1088
1089 ++*pos;
1090 return sk;
1091}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001092EXPORT_SYMBOL_GPL(ping_seq_next);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001093
Lorenzo Colittid862e542013-05-31 15:05:50 +00001094void ping_seq_stop(struct seq_file *seq, void *v)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001095{
1096 read_unlock_bh(&ping_table.lock);
1097}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001098EXPORT_SYMBOL_GPL(ping_seq_stop);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001099
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001100static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
Tetsuo Handa652586d2013-11-14 14:31:57 -08001101 int bucket)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001102{
1103 struct inet_sock *inet = inet_sk(sp);
1104 __be32 dest = inet->inet_daddr;
1105 __be32 src = inet->inet_rcv_saddr;
1106 __u16 destp = ntohs(inet->inet_dport);
1107 __u16 srcp = ntohs(inet->inet_sport);
1108
1109 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
Tetsuo Handa652586d2013-11-14 14:31:57 -08001110 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001111 bucket, src, srcp, dest, destp, sp->sk_state,
1112 sk_wmem_alloc_get(sp),
1113 sk_rmem_alloc_get(sp),
Eric W. Biedermana7cb5a42012-05-24 01:10:10 -06001114 0, 0L, 0,
1115 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1116 0, sock_i_ino(sp),
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001117 atomic_read(&sp->sk_refcnt), sp,
Tetsuo Handa652586d2013-11-14 14:31:57 -08001118 atomic_read(&sp->sk_drops));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001119}
1120
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001121static int ping_v4_seq_show(struct seq_file *seq, void *v)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001122{
Tetsuo Handa652586d2013-11-14 14:31:57 -08001123 seq_setwidth(seq, 127);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001124 if (v == SEQ_START_TOKEN)
Tetsuo Handa652586d2013-11-14 14:31:57 -08001125 seq_puts(seq, " sl local_address rem_address st tx_queue "
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001126 "rx_queue tr tm->when retrnsmt uid timeout "
1127 "inode ref pointer drops");
1128 else {
1129 struct ping_iter_state *state = seq->private;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001130
Tetsuo Handa652586d2013-11-14 14:31:57 -08001131 ping_v4_format_sock(v, seq, state->bucket);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001132 }
Tetsuo Handa652586d2013-11-14 14:31:57 -08001133 seq_pad(seq, '\n');
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001134 return 0;
1135}
1136
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001137static const struct seq_operations ping_v4_seq_ops = {
1138 .show = ping_v4_seq_show,
1139 .start = ping_v4_seq_start,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001140 .next = ping_seq_next,
1141 .stop = ping_seq_stop,
1142};
1143
1144static int ping_seq_open(struct inode *inode, struct file *file)
1145{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001146 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1147 return seq_open_net(inode, file, &afinfo->seq_ops,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001148 sizeof(struct ping_iter_state));
1149}
1150
Lorenzo Colittid862e542013-05-31 15:05:50 +00001151const struct file_operations ping_seq_fops = {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001152 .open = ping_seq_open,
1153 .read = seq_read,
1154 .llseek = seq_lseek,
1155 .release = seq_release_net,
1156};
Lorenzo Colittid862e542013-05-31 15:05:50 +00001157EXPORT_SYMBOL_GPL(ping_seq_fops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001158
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001159static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1160 .name = "icmp",
1161 .family = AF_INET,
1162 .seq_fops = &ping_seq_fops,
1163 .seq_ops = {
1164 .start = ping_v4_seq_start,
1165 .show = ping_v4_seq_show,
1166 .next = ping_seq_next,
1167 .stop = ping_seq_stop,
1168 },
1169};
1170
Lorenzo Colittid862e542013-05-31 15:05:50 +00001171int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001172{
1173 struct proc_dir_entry *p;
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001174 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1175 afinfo->seq_fops, afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001176 if (!p)
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001177 return -ENOMEM;
1178 return 0;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001179}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001180EXPORT_SYMBOL_GPL(ping_proc_register);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001181
Lorenzo Colittid862e542013-05-31 15:05:50 +00001182void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001183{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001184 remove_proc_entry(afinfo->name, net->proc_net);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001185}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001186EXPORT_SYMBOL_GPL(ping_proc_unregister);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001187
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001188static int __net_init ping_v4_proc_init_net(struct net *net)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001189{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001190 return ping_proc_register(net, &ping_v4_seq_afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001191}
1192
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001193static void __net_exit ping_v4_proc_exit_net(struct net *net)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001194{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001195 ping_proc_unregister(net, &ping_v4_seq_afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001196}
1197
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001198static struct pernet_operations ping_v4_net_ops = {
1199 .init = ping_v4_proc_init_net,
1200 .exit = ping_v4_proc_exit_net,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001201};
1202
1203int __init ping_proc_init(void)
1204{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001205 return register_pernet_subsys(&ping_v4_net_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001206}
1207
1208void ping_proc_exit(void)
1209{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001210 unregister_pernet_subsys(&ping_v4_net_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001211}
1212
1213#endif
1214
1215void __init ping_init(void)
1216{
1217 int i;
1218
1219 for (i = 0; i < PING_HTABLE_SIZE; i++)
1220 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1221 rwlock_init(&ping_table.lock);
1222}