| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * PACKET - implements raw packet sockets. |
| * |
| * Version: $Id: af_packet.c,v 1.61 2002/02/08 03:57:19 davem Exp $ |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| * |
| * Fixes: |
| * Alan Cox : verify_area() now used correctly |
| * Alan Cox : new skbuff lists, look ma no backlogs! |
| * Alan Cox : tidied skbuff lists. |
| * Alan Cox : Now uses generic datagram routines I |
| * added. Also fixed the peek/read crash |
| * from all old Linux datagram code. |
| * Alan Cox : Uses the improved datagram code. |
| * Alan Cox : Added NULL's for socket options. |
| * Alan Cox : Re-commented the code. |
| * Alan Cox : Use new kernel side addressing |
| * Rob Janssen : Correct MTU usage. |
| * Dave Platt : Counter leaks caused by incorrect |
| * interrupt locking and some slightly |
| * dubious gcc output. Can you read |
| * compiler: it said _VOLATILE_ |
| * Richard Kooijman : Timestamp fixes. |
| * Alan Cox : New buffers. Use sk->mac.raw. |
| * Alan Cox : sendmsg/recvmsg support. |
| * Alan Cox : Protocol setting support |
| * Alexey Kuznetsov : Untied from IPv4 stack. |
| * Cyrus Durgin : Fixed kerneld for kmod. |
| * Michal Ostrowski : Module initialization cleanup. |
| * Ulises Alonso : Frame number limit removal and |
| * packet_set_ring memory leak. |
| * Eric Biederman : Allow for > 8 byte hardware addresses. |
| * The convention is that longer addresses |
| * will simply extend the hardware address |
| * byte arrays at the end of sockaddr_ll |
| * and packet_mreq. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/mm.h> |
| #include <linux/capability.h> |
| #include <linux/fcntl.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_packet.h> |
| #include <linux/wireless.h> |
| #include <linux/kernel.h> |
| #include <linux/kmod.h> |
| #include <net/ip.h> |
| #include <net/protocol.h> |
| #include <linux/skbuff.h> |
| #include <net/sock.h> |
| #include <linux/errno.h> |
| #include <linux/timer.h> |
| #include <asm/system.h> |
| #include <asm/uaccess.h> |
| #include <asm/ioctls.h> |
| #include <asm/page.h> |
| #include <asm/cacheflush.h> |
| #include <asm/io.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/poll.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| |
| #ifdef CONFIG_INET |
| #include <net/inet_common.h> |
| #endif |
| |
| #define CONFIG_SOCK_PACKET 1 |
| |
| /* |
| Assumptions: |
| - if device has no dev->hard_header routine, it adds and removes ll header |
| inside itself. In this case ll header is invisible outside of device, |
| but higher levels still should reserve dev->hard_header_len. |
| Some devices are enough clever to reallocate skb, when header |
| will not fit to reserved space (tunnel), another ones are silly |
| (PPP). |
| - packet socket receives packets with pulled ll header, |
| so that SOCK_RAW should push it back. |
| |
| On receive: |
| ----------- |
| |
| Incoming, dev->hard_header!=NULL |
| mac_header -> ll header |
| data -> data |
| |
| Outgoing, dev->hard_header!=NULL |
| mac_header -> ll header |
| data -> ll header |
| |
| Incoming, dev->hard_header==NULL |
| mac_header -> UNKNOWN position. It is very likely, that it points to ll |
| header. PPP makes it, that is wrong, because introduce |
| assymetry between rx and tx paths. |
| data -> data |
| |
| Outgoing, dev->hard_header==NULL |
| mac_header -> data. ll header is still not built! |
| data -> data |
| |
| Resume |
| If dev->hard_header==NULL we are unlikely to restore sensible ll header. |
| |
| |
| On transmit: |
| ------------ |
| |
| dev->hard_header != NULL |
| mac_header -> ll header |
| data -> ll header |
| |
| dev->hard_header == NULL (ll header is added by device, we cannot control it) |
| mac_header -> data |
| data -> data |
| |
| We should set nh.raw on output to correct posistion, |
| packet classifier depends on it. |
| */ |
| |
| /* List of all packet sockets. */ |
| static HLIST_HEAD(packet_sklist); |
| static DEFINE_RWLOCK(packet_sklist_lock); |
| |
| static atomic_t packet_socks_nr; |
| |
| |
| /* Private packet socket structures. */ |
| |
| struct packet_mclist |
| { |
| struct packet_mclist *next; |
| int ifindex; |
| int count; |
| unsigned short type; |
| unsigned short alen; |
| unsigned char addr[MAX_ADDR_LEN]; |
| }; |
| /* identical to struct packet_mreq except it has |
| * a longer address field. |
| */ |
| struct packet_mreq_max |
| { |
| int mr_ifindex; |
| unsigned short mr_type; |
| unsigned short mr_alen; |
| unsigned char mr_address[MAX_ADDR_LEN]; |
| }; |
| |
| #ifdef CONFIG_PACKET_MMAP |
| static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing); |
| #endif |
| |
| static void packet_flush_mclist(struct sock *sk); |
| |
| struct packet_sock { |
| /* struct sock has to be the first member of packet_sock */ |
| struct sock sk; |
| struct tpacket_stats stats; |
| #ifdef CONFIG_PACKET_MMAP |
| char * *pg_vec; |
| unsigned int head; |
| unsigned int frames_per_block; |
| unsigned int frame_size; |
| unsigned int frame_max; |
| int copy_thresh; |
| #endif |
| struct packet_type prot_hook; |
| spinlock_t bind_lock; |
| unsigned int running:1, /* prot_hook is attached*/ |
| auxdata:1, |
| origdev:1; |
| int ifindex; /* bound device */ |
| __be16 num; |
| struct packet_mclist *mclist; |
| #ifdef CONFIG_PACKET_MMAP |
| atomic_t mapped; |
| unsigned int pg_vec_order; |
| unsigned int pg_vec_pages; |
| unsigned int pg_vec_len; |
| #endif |
| }; |
| |
| struct packet_skb_cb { |
| unsigned int origlen; |
| union { |
| struct sockaddr_pkt pkt; |
| struct sockaddr_ll ll; |
| } sa; |
| }; |
| |
| #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
| |
| #ifdef CONFIG_PACKET_MMAP |
| |
| static inline struct tpacket_hdr *packet_lookup_frame(struct packet_sock *po, unsigned int position) |
| { |
| unsigned int pg_vec_pos, frame_offset; |
| |
| pg_vec_pos = position / po->frames_per_block; |
| frame_offset = position % po->frames_per_block; |
| |
| return (struct tpacket_hdr *)(po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size)); |
| } |
| #endif |
| |
| static inline struct packet_sock *pkt_sk(struct sock *sk) |
| { |
| return (struct packet_sock *)sk; |
| } |
| |
| static void packet_sock_destruct(struct sock *sk) |
| { |
| BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); |
| BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); |
| |
| if (!sock_flag(sk, SOCK_DEAD)) { |
| printk("Attempt to release alive packet socket: %p\n", sk); |
| return; |
| } |
| |
| atomic_dec(&packet_socks_nr); |
| #ifdef PACKET_REFCNT_DEBUG |
| printk(KERN_DEBUG "PACKET socket %p is free, %d are alive\n", sk, atomic_read(&packet_socks_nr)); |
| #endif |
| } |
| |
| |
| static const struct proto_ops packet_ops; |
| |
| #ifdef CONFIG_SOCK_PACKET |
| static const struct proto_ops packet_ops_spkt; |
| |
| static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
| { |
| struct sock *sk; |
| struct sockaddr_pkt *spkt; |
| |
| /* |
| * When we registered the protocol we saved the socket in the data |
| * field for just this event. |
| */ |
| |
| sk = pt->af_packet_priv; |
| |
| /* |
| * Yank back the headers [hope the device set this |
| * right or kerboom...] |
| * |
| * Incoming packets have ll header pulled, |
| * push it back. |
| * |
| * For outgoing ones skb->data == skb_mac_header(skb) |
| * so that this procedure is noop. |
| */ |
| |
| if (skb->pkt_type == PACKET_LOOPBACK) |
| goto out; |
| |
| if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| goto oom; |
| |
| /* drop any routing info */ |
| dst_release(skb->dst); |
| skb->dst = NULL; |
| |
| /* drop conntrack reference */ |
| nf_reset(skb); |
| |
| spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
| |
| skb_push(skb, skb->data - skb_mac_header(skb)); |
| |
| /* |
| * The SOCK_PACKET socket receives _all_ frames. |
| */ |
| |
| spkt->spkt_family = dev->type; |
| strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); |
| spkt->spkt_protocol = skb->protocol; |
| |
| /* |
| * Charge the memory to the socket. This is done specifically |
| * to prevent sockets using all the memory up. |
| */ |
| |
| if (sock_queue_rcv_skb(sk,skb) == 0) |
| return 0; |
| |
| out: |
| kfree_skb(skb); |
| oom: |
| return 0; |
| } |
| |
| |
| /* |
| * Output a raw packet to a device layer. This bypasses all the other |
| * protocol layers and you must therefore supply it with a complete frame |
| */ |
| |
| static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
| struct msghdr *msg, size_t len) |
| { |
| struct sock *sk = sock->sk; |
| struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name; |
| struct sk_buff *skb; |
| struct net_device *dev; |
| __be16 proto=0; |
| int err; |
| |
| /* |
| * Get and verify the address. |
| */ |
| |
| if (saddr) |
| { |
| if (msg->msg_namelen < sizeof(struct sockaddr)) |
| return(-EINVAL); |
| if (msg->msg_namelen==sizeof(struct sockaddr_pkt)) |
| proto=saddr->spkt_protocol; |
| } |
| else |
| return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */ |
| |
| /* |
| * Find the device first to size check it |
| */ |
| |
| saddr->spkt_device[13] = 0; |
| dev = dev_get_by_name(saddr->spkt_device); |
| err = -ENODEV; |
| if (dev == NULL) |
| goto out_unlock; |
| |
| err = -ENETDOWN; |
| if (!(dev->flags & IFF_UP)) |
| goto out_unlock; |
| |
| /* |
| * You may not queue a frame bigger than the mtu. This is the lowest level |
| * raw protocol and you must do your own fragmentation at this level. |
| */ |
| |
| err = -EMSGSIZE; |
| if (len > dev->mtu + dev->hard_header_len) |
| goto out_unlock; |
| |
| err = -ENOBUFS; |
| skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL); |
| |
| /* |
| * If the write buffer is full, then tough. At this level the user gets to |
| * deal with the problem - do your own algorithmic backoffs. That's far |
| * more flexible. |
| */ |
| |
| if (skb == NULL) |
| goto out_unlock; |
| |
| /* |
| * Fill it in |
| */ |
| |
| /* FIXME: Save some space for broken drivers that write a |
| * hard header at transmission time by themselves. PPP is the |
| * notable one here. This should really be fixed at the driver level. |
| */ |
| skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| skb_reset_network_header(skb); |
| |
| /* Try to align data part correctly */ |
| if (dev->hard_header) { |
| skb->data -= dev->hard_header_len; |
| skb->tail -= dev->hard_header_len; |
| if (len < dev->hard_header_len) |
| skb_reset_network_header(skb); |
| } |
| |
| /* Returns -EFAULT on error */ |
| err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); |
| skb->protocol = proto; |
| skb->dev = dev; |
| skb->priority = sk->sk_priority; |
| if (err) |
| goto out_free; |
| |
| /* |
| * Now send it |
| */ |
| |
| dev_queue_xmit(skb); |
| dev_put(dev); |
| return(len); |
| |
| out_free: |
| kfree_skb(skb); |
| out_unlock: |
| if (dev) |
| dev_put(dev); |
| return err; |
| } |
| #endif |
| |
| static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
| unsigned int res) |
| { |
| struct sk_filter *filter; |
| |
| rcu_read_lock_bh(); |
| filter = rcu_dereference(sk->sk_filter); |
| if (filter != NULL) |
| res = sk_run_filter(skb, filter->insns, filter->len); |
| rcu_read_unlock_bh(); |
| |
| return res; |
| } |
| |
| /* |
| This function makes lazy skb cloning in hope that most of packets |
| are discarded by BPF. |
| |
| Note tricky part: we DO mangle shared skb! skb->data, skb->len |
| and skb->cb are mangled. It works because (and until) packets |
| falling here are owned by current CPU. Output packets are cloned |
| by dev_queue_xmit_nit(), input packets are processed by net_bh |
| sequencially, so that if we return skb to original state on exit, |
| we will not harm anyone. |
| */ |
| |
| static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
| { |
| struct sock *sk; |
| struct sockaddr_ll *sll; |
| struct packet_sock *po; |
| u8 * skb_head = skb->data; |
| int skb_len = skb->len; |
| unsigned int snaplen, res; |
| |
| if (skb->pkt_type == PACKET_LOOPBACK) |
| goto drop; |
| |
| sk = pt->af_packet_priv; |
| po = pkt_sk(sk); |
| |
| skb->dev = dev; |
| |
| if (dev->hard_header) { |
| /* The device has an explicit notion of ll header, |
| exported to higher levels. |
| |
| Otherwise, the device hides datails of it frame |
| structure, so that corresponding packet head |
| never delivered to user. |
| */ |
| if (sk->sk_type != SOCK_DGRAM) |
| skb_push(skb, skb->data - skb_mac_header(skb)); |
| else if (skb->pkt_type == PACKET_OUTGOING) { |
| /* Special case: outgoing packets have ll header at head */ |
| skb_pull(skb, skb_network_offset(skb)); |
| } |
| } |
| |
| snaplen = skb->len; |
| |
| res = run_filter(skb, sk, snaplen); |
| if (!res) |
| goto drop_n_restore; |
| if (snaplen > res) |
| snaplen = res; |
| |
| if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
| (unsigned)sk->sk_rcvbuf) |
| goto drop_n_acct; |
| |
| if (skb_shared(skb)) { |
| struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); |
| if (nskb == NULL) |
| goto drop_n_acct; |
| |
| if (skb_head != skb->data) { |
| skb->data = skb_head; |
| skb->len = skb_len; |
| } |
| kfree_skb(skb); |
| skb = nskb; |
| } |
| |
| BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
| sizeof(skb->cb)); |
| |
| sll = &PACKET_SKB_CB(skb)->sa.ll; |
| sll->sll_family = AF_PACKET; |
| sll->sll_hatype = dev->type; |
| sll->sll_protocol = skb->protocol; |
| sll->sll_pkttype = skb->pkt_type; |
| if (unlikely(po->origdev) && skb->pkt_type == PACKET_HOST) |
| sll->sll_ifindex = orig_dev->ifindex; |
| else |
| sll->sll_ifindex = dev->ifindex; |
| sll->sll_halen = 0; |
| |
| if (dev->hard_header_parse) |
| sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); |
| |
| PACKET_SKB_CB(skb)->origlen = skb->len; |
| |
| if (pskb_trim(skb, snaplen)) |
| goto drop_n_acct; |
| |
| skb_set_owner_r(skb, sk); |
| skb->dev = NULL; |
| dst_release(skb->dst); |
| skb->dst = NULL; |
| |
| /* drop conntrack reference */ |
| nf_reset(skb); |
| |
| spin_lock(&sk->sk_receive_queue.lock); |
| po->stats.tp_packets++; |
| __skb_queue_tail(&sk->sk_receive_queue, skb); |
| spin_unlock(&sk->sk_receive_queue.lock); |
| sk->sk_data_ready(sk, skb->len); |
| return 0; |
| |
| drop_n_acct: |
| spin_lock(&sk->sk_receive_queue.lock); |
| po->stats.tp_drops++; |
| spin_unlock(&sk->sk_receive_queue.lock); |
| |
| drop_n_restore: |
| if (skb_head != skb->data && skb_shared(skb)) { |
| skb->data = skb_head; |
| skb->len = skb_len; |
| } |
| drop: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| #ifdef CONFIG_PACKET_MMAP |
| static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
| { |
| struct sock *sk; |
| struct packet_sock *po; |
| struct sockaddr_ll *sll; |
| struct tpacket_hdr *h; |
| u8 * skb_head = skb->data; |
| int skb_len = skb->len; |
| unsigned int snaplen, res; |
| unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
| unsigned short macoff, netoff; |
| struct sk_buff *copy_skb = NULL; |
| struct timeval tv; |
| |
| if (skb->pkt_type == PACKET_LOOPBACK) |
| goto drop; |
| |
| sk = pt->af_packet_priv; |
| po = pkt_sk(sk); |
| |
| if (dev->hard_header) { |
| if (sk->sk_type != SOCK_DGRAM) |
| skb_push(skb, skb->data - skb_mac_header(skb)); |
| else if (skb->pkt_type == PACKET_OUTGOING) { |
| /* Special case: outgoing packets have ll header at head */ |
| skb_pull(skb, skb_network_offset(skb)); |
| } |
| } |
| |
| if (skb->ip_summed == CHECKSUM_PARTIAL) |
| status |= TP_STATUS_CSUMNOTREADY; |
| |
| snaplen = skb->len; |
| |
| res = run_filter(skb, sk, snaplen); |
| if (!res) |
| goto drop_n_restore; |
| if (snaplen > res) |
| snaplen = res; |
| |
| if (sk->sk_type == SOCK_DGRAM) { |
| macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16; |
| } else { |
| unsigned maclen = skb_network_offset(skb); |
| netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen)); |
| macoff = netoff - maclen; |
| } |
| |
| if (macoff + snaplen > po->frame_size) { |
| if (po->copy_thresh && |
| atomic_read(&sk->sk_rmem_alloc) + skb->truesize < |
| (unsigned)sk->sk_rcvbuf) { |
| if (skb_shared(skb)) { |
| copy_skb = skb_clone(skb, GFP_ATOMIC); |
| } else { |
| copy_skb = skb_get(skb); |
| skb_head = skb->data; |
| } |
| if (copy_skb) |
| skb_set_owner_r(copy_skb, sk); |
| } |
| snaplen = po->frame_size - macoff; |
| if ((int)snaplen < 0) |
| snaplen = 0; |
| } |
| |
| spin_lock(&sk->sk_receive_queue.lock); |
| h = packet_lookup_frame(po, po->head); |
| |
| if (h->tp_status) |
| goto ring_is_full; |
| po->head = po->head != po->frame_max ? po->head+1 : 0; |
| po->stats.tp_packets++; |
| if (copy_skb) { |
| status |= TP_STATUS_COPY; |
| __skb_queue_tail(&sk->sk_receive_queue, copy_skb); |
| } |
| if (!po->stats.tp_drops) |
| status &= ~TP_STATUS_LOSING; |
| spin_unlock(&sk->sk_receive_queue.lock); |
| |
| skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen); |
| |
| h->tp_len = skb->len; |
| h->tp_snaplen = snaplen; |
| h->tp_mac = macoff; |
| h->tp_net = netoff; |
| if (skb->tstamp.tv64 == 0) { |
| __net_timestamp(skb); |
| sock_enable_timestamp(sk); |
| } |
| tv = ktime_to_timeval(skb->tstamp); |
| h->tp_sec = tv.tv_sec; |
| h->tp_usec = tv.tv_usec; |
| |
| sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h))); |
| sll->sll_halen = 0; |
| if (dev->hard_header_parse) |
| sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); |
| sll->sll_family = AF_PACKET; |
| sll->sll_hatype = dev->type; |
| sll->sll_protocol = skb->protocol; |
| sll->sll_pkttype = skb->pkt_type; |
| if (unlikely(po->origdev) && skb->pkt_type == PACKET_HOST) |
| sll->sll_ifindex = orig_dev->ifindex; |
| else |
| sll->sll_ifindex = dev->ifindex; |
| |
| h->tp_status = status; |
| smp_mb(); |
| |
| { |
| struct page *p_start, *p_end; |
| u8 *h_end = (u8 *)h + macoff + snaplen - 1; |
| |
| p_start = virt_to_page(h); |
| p_end = virt_to_page(h_end); |
| while (p_start <= p_end) { |
| flush_dcache_page(p_start); |
| p_start++; |
| } |
| } |
| |
| sk->sk_data_ready(sk, 0); |
| |
| drop_n_restore: |
| if (skb_head != skb->data && skb_shared(skb)) { |
| skb->data = skb_head; |
| skb->len = skb_len; |
| } |
| drop: |
| kfree_skb(skb); |
| return 0; |
| |
| ring_is_full: |
| po->stats.tp_drops++; |
| spin_unlock(&sk->sk_receive_queue.lock); |
| |
| sk->sk_data_ready(sk, 0); |
| if (copy_skb) |
| kfree_skb(copy_skb); |
| goto drop_n_restore; |
| } |
| |
| #endif |
| |
| |
| static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
| struct msghdr *msg, size_t len) |
| { |
| struct sock *sk = sock->sk; |
| struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name; |
| struct sk_buff *skb; |
| struct net_device *dev; |
| __be16 proto; |
| unsigned char *addr; |
| int ifindex, err, reserve = 0; |
| |
| /* |
| * Get and verify the address. |
| */ |
| |
| if (saddr == NULL) { |
| struct packet_sock *po = pkt_sk(sk); |
| |
| ifindex = po->ifindex; |
| proto = po->num; |
| addr = NULL; |
| } else { |
| err = -EINVAL; |
| if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| goto out; |
| if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
| goto out; |
| ifindex = saddr->sll_ifindex; |
| proto = saddr->sll_protocol; |
| addr = saddr->sll_addr; |
| } |
| |
| |
| dev = dev_get_by_index(ifindex); |
| err = -ENXIO; |
| if (dev == NULL) |
| goto out_unlock; |
| if (sock->type == SOCK_RAW) |
| reserve = dev->hard_header_len; |
| |
| err = -ENETDOWN; |
| if (!(dev->flags & IFF_UP)) |
| goto out_unlock; |
| |
| err = -EMSGSIZE; |
| if (len > dev->mtu+reserve) |
| goto out_unlock; |
| |
| skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev), |
| msg->msg_flags & MSG_DONTWAIT, &err); |
| if (skb==NULL) |
| goto out_unlock; |
| |
| skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| skb_reset_network_header(skb); |
| |
| if (dev->hard_header) { |
| int res; |
| err = -EINVAL; |
| res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); |
| if (sock->type != SOCK_DGRAM) { |
| skb_reset_tail_pointer(skb); |
| skb->len = 0; |
| } else if (res < 0) |
| goto out_free; |
| } |
| |
| /* Returns -EFAULT on error */ |
| err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); |
| if (err) |
| goto out_free; |
| |
| skb->protocol = proto; |
| skb->dev = dev; |
| skb->priority = sk->sk_priority; |
| |
| /* |
| * Now send it |
| */ |
| |
| err = dev_queue_xmit(skb); |
| if (err > 0 && (err = net_xmit_errno(err)) != 0) |
| goto out_unlock; |
| |
| dev_put(dev); |
| |
| return(len); |
| |
| out_free: |
| kfree_skb(skb); |
| out_unlock: |
| if (dev) |
| dev_put(dev); |
| out: |
| return err; |
| } |
| |
| /* |
| * Close a PACKET socket. This is fairly simple. We immediately go |
| * to 'closed' state and remove our protocol entry in the device list. |
| */ |
| |
| static int packet_release(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| struct packet_sock *po; |
| |
| if (!sk) |
| return 0; |
| |
| po = pkt_sk(sk); |
| |
| write_lock_bh(&packet_sklist_lock); |
| sk_del_node_init(sk); |
| write_unlock_bh(&packet_sklist_lock); |
| |
| /* |
| * Unhook packet receive handler. |
| */ |
| |
| if (po->running) { |
| /* |
| * Remove the protocol hook |
| */ |
| dev_remove_pack(&po->prot_hook); |
| po->running = 0; |
| po->num = 0; |
| __sock_put(sk); |
| } |
| |
| packet_flush_mclist(sk); |
| |
| #ifdef CONFIG_PACKET_MMAP |
| if (po->pg_vec) { |
| struct tpacket_req req; |
| memset(&req, 0, sizeof(req)); |
| packet_set_ring(sk, &req, 1); |
| } |
| #endif |
| |
| /* |
| * Now the socket is dead. No more input will appear. |
| */ |
| |
| sock_orphan(sk); |
| sock->sk = NULL; |
| |
| /* Purge queues */ |
| |
| skb_queue_purge(&sk->sk_receive_queue); |
| |
| sock_put(sk); |
| return 0; |
| } |
| |
| /* |
| * Attach a packet hook. |
| */ |
| |
| static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
| { |
| struct packet_sock *po = pkt_sk(sk); |
| /* |
| * Detach an existing hook if present. |
| */ |
| |
| lock_sock(sk); |
| |
| spin_lock(&po->bind_lock); |
| if (po->running) { |
| __sock_put(sk); |
| po->running = 0; |
| po->num = 0; |
| spin_unlock(&po->bind_lock); |
| dev_remove_pack(&po->prot_hook); |
| spin_lock(&po->bind_lock); |
| } |
| |
| po->num = protocol; |
| po->prot_hook.type = protocol; |
| po->prot_hook.dev = dev; |
| |
| po->ifindex = dev ? dev->ifindex : 0; |
| |
| if (protocol == 0) |
| goto out_unlock; |
| |
| if (dev) { |
| if (dev->flags&IFF_UP) { |
| dev_add_pack(&po->prot_hook); |
| sock_hold(sk); |
| po->running = 1; |
| } else { |
| sk->sk_err = ENETDOWN; |
| if (!sock_flag(sk, SOCK_DEAD)) |
| sk->sk_error_report(sk); |
| } |
| } else { |
| dev_add_pack(&po->prot_hook); |
| sock_hold(sk); |
| po->running = 1; |
| } |
| |
| out_unlock: |
| spin_unlock(&po->bind_lock); |
| release_sock(sk); |
| return 0; |
| } |
| |
| /* |
| * Bind a packet socket to a device |
| */ |
| |
| #ifdef CONFIG_SOCK_PACKET |
| |
| static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| { |
| struct sock *sk=sock->sk; |
| char name[15]; |
| struct net_device *dev; |
| int err = -ENODEV; |
| |
| /* |
| * Check legality |
| */ |
| |
| if (addr_len != sizeof(struct sockaddr)) |
| return -EINVAL; |
| strlcpy(name,uaddr->sa_data,sizeof(name)); |
| |
| dev = dev_get_by_name(name); |
| if (dev) { |
| err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
| dev_put(dev); |
| } |
| return err; |
| } |
| #endif |
| |
| static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| { |
| struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; |
| struct sock *sk=sock->sk; |
| struct net_device *dev = NULL; |
| int err; |
| |
| |
| /* |
| * Check legality |
| */ |
| |
| if (addr_len < sizeof(struct sockaddr_ll)) |
| return -EINVAL; |
| if (sll->sll_family != AF_PACKET) |
| return -EINVAL; |
| |
| if (sll->sll_ifindex) { |
| err = -ENODEV; |
| dev = dev_get_by_index(sll->sll_ifindex); |
| if (dev == NULL) |
| goto out; |
| } |
| err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); |
| if (dev) |
| dev_put(dev); |
| |
| out: |
| return err; |
| } |
| |
| static struct proto packet_proto = { |
| .name = "PACKET", |
| .owner = THIS_MODULE, |
| .obj_size = sizeof(struct packet_sock), |
| }; |
| |
| /* |
| * Create a packet of type SOCK_PACKET. |
| */ |
| |
| static int packet_create(struct socket *sock, int protocol) |
| { |
| struct sock *sk; |
| struct packet_sock *po; |
| __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
| int err; |
| |
| if (!capable(CAP_NET_RAW)) |
| return -EPERM; |
| if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW |
| #ifdef CONFIG_SOCK_PACKET |
| && sock->type != SOCK_PACKET |
| #endif |
| ) |
| return -ESOCKTNOSUPPORT; |
| |
| sock->state = SS_UNCONNECTED; |
| |
| err = -ENOBUFS; |
| sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 1); |
| if (sk == NULL) |
| goto out; |
| |
| sock->ops = &packet_ops; |
| #ifdef CONFIG_SOCK_PACKET |
| if (sock->type == SOCK_PACKET) |
| sock->ops = &packet_ops_spkt; |
| #endif |
| sock_init_data(sock, sk); |
| |
| po = pkt_sk(sk); |
| sk->sk_family = PF_PACKET; |
| po->num = proto; |
| |
| sk->sk_destruct = packet_sock_destruct; |
| atomic_inc(&packet_socks_nr); |
| |
| /* |
| * Attach a protocol block |
| */ |
| |
| spin_lock_init(&po->bind_lock); |
| po->prot_hook.func = packet_rcv; |
| #ifdef CONFIG_SOCK_PACKET |
| if (sock->type == SOCK_PACKET) |
| po->prot_hook.func = packet_rcv_spkt; |
| #endif |
| po->prot_hook.af_packet_priv = sk; |
| |
| if (proto) { |
| po->prot_hook.type = proto; |
| dev_add_pack(&po->prot_hook); |
| sock_hold(sk); |
| po->running = 1; |
| } |
| |
| write_lock_bh(&packet_sklist_lock); |
| sk_add_node(sk, &packet_sklist); |
| write_unlock_bh(&packet_sklist_lock); |
| return(0); |
| out: |
| return err; |
| } |
| |
| /* |
| * Pull a packet from our receive queue and hand it to the user. |
| * If necessary we block. |
| */ |
| |
| static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, |
| struct msghdr *msg, size_t len, int flags) |
| { |
| struct sock *sk = sock->sk; |
| struct sk_buff *skb; |
| int copied, err; |
| struct sockaddr_ll *sll; |
| |
| err = -EINVAL; |
| if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) |
| goto out; |
| |
| #if 0 |
| /* What error should we return now? EUNATTACH? */ |
| if (pkt_sk(sk)->ifindex < 0) |
| return -ENODEV; |
| #endif |
| |
| /* |
| * Call the generic datagram receiver. This handles all sorts |
| * of horrible races and re-entrancy so we can forget about it |
| * in the protocol layers. |
| * |
| * Now it will return ENETDOWN, if device have just gone down, |
| * but then it will block. |
| */ |
| |
| skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err); |
| |
| /* |
| * An error occurred so return it. Because skb_recv_datagram() |
| * handles the blocking we don't see and worry about blocking |
| * retries. |
| */ |
| |
| if (skb == NULL) |
| goto out; |
| |
| /* |
| * If the address length field is there to be filled in, we fill |
| * it in now. |
| */ |
| |
| sll = &PACKET_SKB_CB(skb)->sa.ll; |
| if (sock->type == SOCK_PACKET) |
| msg->msg_namelen = sizeof(struct sockaddr_pkt); |
| else |
| msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); |
| |
| /* |
| * You lose any data beyond the buffer you gave. If it worries a |
| * user program they can ask the device for its MTU anyway. |
| */ |
| |
| copied = skb->len; |
| if (copied > len) |
| { |
| copied=len; |
| msg->msg_flags|=MSG_TRUNC; |
| } |
| |
| err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| if (err) |
| goto out_free; |
| |
| sock_recv_timestamp(msg, sk, skb); |
| |
| if (msg->msg_name) |
| memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
| msg->msg_namelen); |
| |
| if (pkt_sk(sk)->auxdata) { |
| struct tpacket_auxdata aux; |
| |
| aux.tp_status = TP_STATUS_USER; |
| if (skb->ip_summed == CHECKSUM_PARTIAL) |
| aux.tp_status |= TP_STATUS_CSUMNOTREADY; |
| aux.tp_len = PACKET_SKB_CB(skb)->origlen; |
| aux.tp_snaplen = skb->len; |
| aux.tp_mac = 0; |
| aux.tp_net = skb_network_offset(skb); |
| |
| put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
| } |
| |
| /* |
| * Free or return the buffer as appropriate. Again this |
| * hides all the races and re-entrancy issues from us. |
| */ |
| err = (flags&MSG_TRUNC) ? skb->len : copied; |
| |
| out_free: |
| skb_free_datagram(sk, skb); |
| out: |
| return err; |
| } |
| |
| #ifdef CONFIG_SOCK_PACKET |
| static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
| int *uaddr_len, int peer) |
| { |
| struct net_device *dev; |
| struct sock *sk = sock->sk; |
| |
| if (peer) |
| return -EOPNOTSUPP; |
| |
| uaddr->sa_family = AF_PACKET; |
| dev = dev_get_by_index(pkt_sk(sk)->ifindex); |
| if (dev) { |
| strlcpy(uaddr->sa_data, dev->name, 15); |
| dev_put(dev); |
| } else |
| memset(uaddr->sa_data, 0, 14); |
| *uaddr_len = sizeof(*uaddr); |
| |
| return 0; |
| } |
| #endif |
| |
| static int packet_getname(struct socket *sock, struct sockaddr *uaddr, |
| int *uaddr_len, int peer) |
| { |
| struct net_device *dev; |
| struct sock *sk = sock->sk; |
| struct packet_sock *po = pkt_sk(sk); |
| struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; |
| |
| if (peer) |
| return -EOPNOTSUPP; |
| |
| sll->sll_family = AF_PACKET; |
| sll->sll_ifindex = po->ifindex; |
| sll->sll_protocol = po->num; |
| dev = dev_get_by_index(po->ifindex); |
| if (dev) { |
| sll->sll_hatype = dev->type; |
| sll->sll_halen = dev->addr_len; |
| memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); |
| dev_put(dev); |
| } else { |
| sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ |
| sll->sll_halen = 0; |
| } |
| *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
| |
| return 0; |
| } |
| |
| static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what) |
| { |
| switch (i->type) { |
| case PACKET_MR_MULTICAST: |
| if (what > 0) |
| dev_mc_add(dev, i->addr, i->alen, 0); |
| else |
| dev_mc_delete(dev, i->addr, i->alen, 0); |
| break; |
| case PACKET_MR_PROMISC: |
| dev_set_promiscuity(dev, what); |
| break; |
| case PACKET_MR_ALLMULTI: |
| dev_set_allmulti(dev, what); |
| break; |
| default:; |
| } |
| } |
| |
| static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) |
| { |
| for ( ; i; i=i->next) { |
| if (i->ifindex == dev->ifindex) |
| packet_dev_mc(dev, i, what); |
| } |
| } |
| |
| static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
| { |
| struct packet_sock *po = pkt_sk(sk); |
| struct packet_mclist *ml, *i; |
| struct net_device *dev; |
| int err; |
| |
| rtnl_lock(); |
| |
| err = -ENODEV; |
| dev = __dev_get_by_index(mreq->mr_ifindex); |
| if (!dev) |
| goto done; |
| |
| err = -EINVAL; |
| if (mreq->mr_alen > dev->addr_len) |
| goto done; |
| |
| err = -ENOBUFS; |
| i = kmalloc(sizeof(*i), GFP_KERNEL); |
| if (i == NULL) |
| goto done; |
| |
| err = 0; |
| for (ml = po->mclist; ml; ml = ml->next) { |
| if (ml->ifindex == mreq->mr_ifindex && |
| ml->type == mreq->mr_type && |
| ml->alen == mreq->mr_alen && |
| memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| ml->count++; |
| /* Free the new element ... */ |
| kfree(i); |
| goto done; |
| } |
| } |
| |
| i->type = mreq->mr_type; |
| i->ifindex = mreq->mr_ifindex; |
| i->alen = mreq->mr_alen; |
| memcpy(i->addr, mreq->mr_address, i->alen); |
| i->count = 1; |
| i->next = po->mclist; |
| po->mclist = i; |
| packet_dev_mc(dev, i, +1); |
| |
| done: |
| rtnl_unlock(); |
| return err; |
| } |
| |
| static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
| { |
| struct packet_mclist *ml, **mlp; |
| |
| rtnl_lock(); |
| |
| for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { |
| if (ml->ifindex == mreq->mr_ifindex && |
| ml->type == mreq->mr_type && |
| ml->alen == mreq->mr_alen && |
| memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
| if (--ml->count == 0) { |
| struct net_device *dev; |
| *mlp = ml->next; |
| dev = dev_get_by_index(ml->ifindex); |
| if (dev) { |
| packet_dev_mc(dev, ml, -1); |
| dev_put(dev); |
| } |
| kfree(ml); |
| } |
| rtnl_unlock(); |
| return 0; |
| } |
| } |
| rtnl_unlock(); |
| return -EADDRNOTAVAIL; |
| } |
| |
| static void packet_flush_mclist(struct sock *sk) |
| { |
| struct packet_sock *po = pkt_sk(sk); |
| struct packet_mclist *ml; |
| |
| if (!po->mclist) |
| return; |
| |
| rtnl_lock(); |
| while ((ml = po->mclist) != NULL) { |
| struct net_device *dev; |
| |
| po->mclist = ml->next; |
| if ((dev = dev_get_by_index(ml->ifindex)) != NULL) { |
| packet_dev_mc(dev, ml, -1); |
| dev_put(dev); |
| } |
| kfree(ml); |
| } |
| rtnl_unlock(); |
| } |
| |
| static int |
| packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) |
| { |
| struct sock *sk = sock->sk; |
| struct packet_sock *po = pkt_sk(sk); |
| int ret; |
| |
| if (level != SOL_PACKET) |
| return -ENOPROTOOPT; |
| |
| switch(optname) { |
| case PACKET_ADD_MEMBERSHIP: |
| case PACKET_DROP_MEMBERSHIP: |
| { |
| struct packet_mreq_max mreq; |
| int len = optlen; |
| memset(&mreq, 0, sizeof(mreq)); |
| if (len < sizeof(struct packet_mreq)) |
| return -EINVAL; |
| if (len > sizeof(mreq)) |
| len = sizeof(mreq); |
| if (copy_from_user(&mreq,optval,len)) |
| return -EFAULT; |
| if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
| return -EINVAL; |
| if (optname == PACKET_ADD_MEMBERSHIP) |
| ret = packet_mc_add(sk, &mreq); |
| else |
| ret = packet_mc_drop(sk, &mreq); |
| return ret; |
| } |
| |
| #ifdef CONFIG_PACKET_MMAP |
| case PACKET_RX_RING: |
| { |
| struct tpacket_req req; |
| |
| if (optlen<sizeof(req)) |
| return -EINVAL; |
| if (copy_from_user(&req,optval,sizeof(req))) |
| return -EFAULT; |
| return packet_set_ring(sk, &req, 0); |
| } |
| case PACKET_COPY_THRESH: |
| { |
| int val; |
| |
| if (optlen!=sizeof(val)) |
| return -EINVAL; |
| if (copy_from_user(&val,optval,sizeof(val))) |
| return -EFAULT; |
| |
| pkt_sk(sk)->copy_thresh = val; |
| return 0; |
| } |
| #endif |
| case PACKET_AUXDATA: |
| { |
| int val; |
| |
| if (optlen < sizeof(val)) |
| return -EINVAL; |
| if (copy_from_user(&val, optval, sizeof(val))) |
| return -EFAULT; |
| |
| po->auxdata = !!val; |
| return 0; |
| } |
| case PACKET_ORIGDEV: |
| { |
| int val; |
| |
| if (optlen < sizeof(val)) |
| return -EINVAL; |
| if (copy_from_user(&val, optval, sizeof(val))) |
| return -EFAULT; |
| |
| po->origdev = !!val; |
| return 0; |
| } |
| default: |
| return -ENOPROTOOPT; |
| } |
| } |
| |
| static int packet_getsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| int len; |
| int val; |
| struct sock *sk = sock->sk; |
| struct packet_sock *po = pkt_sk(sk); |
| void *data; |
| struct tpacket_stats st; |
| |
| if (level != SOL_PACKET) |
| return -ENOPROTOOPT; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| |
| if (len < 0) |
| return -EINVAL; |
| |
| switch(optname) { |
| case PACKET_STATISTICS: |
| if (len > sizeof(struct tpacket_stats)) |
| len = sizeof(struct tpacket_stats); |
| spin_lock_bh(&sk->sk_receive_queue.lock); |
| st = po->stats; |
| memset(&po->stats, 0, sizeof(st)); |
| spin_unlock_bh(&sk->sk_receive_queue.lock); |
| st.tp_packets += st.tp_drops; |
| |
| data = &st; |
| break; |
| case PACKET_AUXDATA: |
| if (len > sizeof(int)) |
| len = sizeof(int); |
| val = po->auxdata; |
| |
| data = &val; |
| break; |
| case PACKET_ORIGDEV: |
| if (len > sizeof(int)) |
| len = sizeof(int); |
| val = po->origdev; |
| |
| data = &val; |
| break; |
| default: |
| return -ENOPROTOOPT; |
| } |
| |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, data, len)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| |
| static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) |
| { |
| struct sock *sk; |
| struct hlist_node *node; |
| struct net_device *dev = data; |
| |
| read_lock(&packet_sklist_lock); |
| sk_for_each(sk, node, &packet_sklist) { |
| struct packet_sock *po = pkt_sk(sk); |
| |
| switch (msg) { |
| case NETDEV_UNREGISTER: |
| if (po->mclist) |
| packet_dev_mclist(dev, po->mclist, -1); |
| /* fallthrough */ |
| |
| case NETDEV_DOWN: |
| if (dev->ifindex == po->ifindex) { |
| spin_lock(&po->bind_lock); |
| if (po->running) { |
| __dev_remove_pack(&po->prot_hook); |
| __sock_put(sk); |
| po->running = 0; |
| sk->sk_err = ENETDOWN; |
| if (!sock_flag(sk, SOCK_DEAD)) |
| sk->sk_error_report(sk); |
| } |
| if (msg == NETDEV_UNREGISTER) { |
| po->ifindex = -1; |
| po->prot_hook.dev = NULL; |
| } |
| spin_unlock(&po->bind_lock); |
| } |
| break; |
| case NETDEV_UP: |
| spin_lock(&po->bind_lock); |
| if (dev->ifindex == po->ifindex && po->num && |
| !po->running) { |
| dev_add_pack(&po->prot_hook); |
| sock_hold(sk); |
| po->running = 1; |
| } |
| spin_unlock(&po->bind_lock); |
| break; |
| } |
| } |
| read_unlock(&packet_sklist_lock); |
| return NOTIFY_DONE; |
| } |
| |
| |
| static int packet_ioctl(struct socket *sock, unsigned int cmd, |
| unsigned long arg) |
| { |
| struct sock *sk = sock->sk; |
| |
| switch(cmd) { |
| case SIOCOUTQ: |
| { |
| int amount = atomic_read(&sk->sk_wmem_alloc); |
| return put_user(amount, (int __user *)arg); |
| } |
| case SIOCINQ: |
| { |
| struct sk_buff *skb; |
| int amount = 0; |
| |
| spin_lock_bh(&sk->sk_receive_queue.lock); |
| skb = skb_peek(&sk->sk_receive_queue); |
| if (skb) |
| amount = skb->len; |
| spin_unlock_bh(&sk->sk_receive_queue.lock); |
| return put_user(amount, (int __user *)arg); |
| } |
| case SIOCGSTAMP: |
| return sock_get_timestamp(sk, (struct timeval __user *)arg); |
| case SIOCGSTAMPNS: |
| return sock_get_timestampns(sk, (struct timespec __user *)arg); |
| |
| #ifdef CONFIG_INET |
| case SIOCADDRT: |
| case SIOCDELRT: |
| case SIOCDARP: |
| case SIOCGARP: |
| case SIOCSARP: |
| case SIOCGIFADDR: |
| case SIOCSIFADDR: |
| case SIOCGIFBRDADDR: |
| case SIOCSIFBRDADDR: |
| case SIOCGIFNETMASK: |
| case SIOCSIFNETMASK: |
| case SIOCGIFDSTADDR: |
| case SIOCSIFDSTADDR: |
| case SIOCSIFFLAGS: |
| return inet_dgram_ops.ioctl(sock, cmd, arg); |
| #endif |
| |
| default: |
| return -ENOIOCTLCMD; |
| } |
| return 0; |
| } |
| |
| #ifndef CONFIG_PACKET_MMAP |
| #define packet_mmap sock_no_mmap |
| #define packet_poll datagram_poll |
| #else |
| |
| static unsigned int packet_poll(struct file * file, struct socket *sock, |
| poll_table *wait) |
| { |
| struct sock *sk = sock->sk; |
| struct packet_sock *po = pkt_sk(sk); |
| unsigned int mask = datagram_poll(file, sock, wait); |
| |
| spin_lock_bh(&sk->sk_receive_queue.lock); |
| if (po->pg_vec) { |
| unsigned last = po->head ? po->head-1 : po->frame_max; |
| struct tpacket_hdr *h; |
| |
| h = packet_lookup_frame(po, last); |
| |
| if (h->tp_status) |
| mask |= POLLIN | POLLRDNORM; |
| } |
| spin_unlock_bh(&sk->sk_receive_queue.lock); |
| return mask; |
| } |
| |
| |
| /* Dirty? Well, I still did not learn better way to account |
| * for user mmaps. |
| */ |
| |
| static void packet_mm_open(struct vm_area_struct *vma) |
| { |
| struct file *file = vma->vm_file; |
| struct socket * sock = file->private_data; |
| struct sock *sk = sock->sk; |
| |
| if (sk) |
| atomic_inc(&pkt_sk(sk)->mapped); |
| } |
| |
| static void packet_mm_close(struct vm_area_struct *vma) |
| { |
| struct file *file = vma->vm_file; |
| struct socket * sock = file->private_data; |
| struct sock *sk = sock->sk; |
| |
| if (sk) |
| atomic_dec(&pkt_sk(sk)->mapped); |
| } |
| |
| static struct vm_operations_struct packet_mmap_ops = { |
| .open = packet_mm_open, |
| .close =packet_mm_close, |
| }; |
| |
| static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order) |
| { |
| return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1); |
| } |
| |
| static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
| { |
| int i; |
| |
| for (i = 0; i < len; i++) { |
| if (likely(pg_vec[i])) |
| free_pages((unsigned long) pg_vec[i], order); |
| } |
| kfree(pg_vec); |
| } |
| |
| static inline char *alloc_one_pg_vec_page(unsigned long order) |
| { |
| return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO, |
| order); |
| } |
| |
| static char **alloc_pg_vec(struct tpacket_req *req, int order) |
| { |
| unsigned int block_nr = req->tp_block_nr; |
| char **pg_vec; |
| int i; |
| |
| pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); |
| if (unlikely(!pg_vec)) |
| goto out; |
| |
| for (i = 0; i < block_nr; i++) { |
| pg_vec[i] = alloc_one_pg_vec_page(order); |
| if (unlikely(!pg_vec[i])) |
| goto out_free_pgvec; |
| } |
| |
| out: |
| return pg_vec; |
| |
| out_free_pgvec: |
| free_pg_vec(pg_vec, order, block_nr); |
| pg_vec = NULL; |
| goto out; |
| } |
| |
| static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) |
| { |
| char **pg_vec = NULL; |
| struct packet_sock *po = pkt_sk(sk); |
| int was_running, order = 0; |
| __be16 num; |
| int err = 0; |
| |
| if (req->tp_block_nr) { |
| int i, l; |
| |
| /* Sanity tests and some calculations */ |
| |
| if (unlikely(po->pg_vec)) |
| return -EBUSY; |
| |
| if (unlikely((int)req->tp_block_size <= 0)) |
| return -EINVAL; |
| if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
| return -EINVAL; |
| if (unlikely(req->tp_frame_size < TPACKET_HDRLEN)) |
| return -EINVAL; |
| if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
| return -EINVAL; |
| |
| po->frames_per_block = req->tp_block_size/req->tp_frame_size; |
| if (unlikely(po->frames_per_block <= 0)) |
| return -EINVAL; |
| if (unlikely((po->frames_per_block * req->tp_block_nr) != |
| req->tp_frame_nr)) |
| return -EINVAL; |
| |
| err = -ENOMEM; |
| order = get_order(req->tp_block_size); |
| pg_vec = alloc_pg_vec(req, order); |
| if (unlikely(!pg_vec)) |
| goto out; |
| |
| l = 0; |
| for (i = 0; i < req->tp_block_nr; i++) { |
| char *ptr = pg_vec[i]; |
| struct tpacket_hdr *header; |
| int k; |
| |
| for (k = 0; k < po->frames_per_block; k++) { |
| header = (struct tpacket_hdr *) ptr; |
| header->tp_status = TP_STATUS_KERNEL; |
| ptr += req->tp_frame_size; |
| } |
| } |
| /* Done */ |
| } else { |
| if (unlikely(req->tp_frame_nr)) |
| return -EINVAL; |
| } |
| |
| lock_sock(sk); |
| |
| /* Detach socket from network */ |
| spin_lock(&po->bind_lock); |
| was_running = po->running; |
| num = po->num; |
| if (was_running) { |
| __dev_remove_pack(&po->prot_hook); |
| po->num = 0; |
| po->running = 0; |
| __sock_put(sk); |
| } |
| spin_unlock(&po->bind_lock); |
| |
| synchronize_net(); |
| |
| err = -EBUSY; |
| if (closing || atomic_read(&po->mapped) == 0) { |
| err = 0; |
| #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) |
| |
| spin_lock_bh(&sk->sk_receive_queue.lock); |
| pg_vec = XC(po->pg_vec, pg_vec); |
| po->frame_max = (req->tp_frame_nr - 1); |
| po->head = 0; |
| po->frame_size = req->tp_frame_size; |
| spin_unlock_bh(&sk->sk_receive_queue.lock); |
| |
| order = XC(po->pg_vec_order, order); |
| req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr); |
| |
| po->pg_vec_pages = req->tp_block_size/PAGE_SIZE; |
| po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv; |
| skb_queue_purge(&sk->sk_receive_queue); |
| #undef XC |
| if (atomic_read(&po->mapped)) |
| printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped)); |
| } |
| |
| spin_lock(&po->bind_lock); |
| if (was_running && !po->running) { |
| sock_hold(sk); |
| po->running = 1; |
| po->num = num; |
| dev_add_pack(&po->prot_hook); |
| } |
| spin_unlock(&po->bind_lock); |
| |
| release_sock(sk); |
| |
| if (pg_vec) |
| free_pg_vec(pg_vec, order, req->tp_block_nr); |
| out: |
| return err; |
| } |
| |
| static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) |
| { |
| struct sock *sk = sock->sk; |
| struct packet_sock *po = pkt_sk(sk); |
| unsigned long size; |
| unsigned long start; |
| int err = -EINVAL; |
| int i; |
| |
| if (vma->vm_pgoff) |
| return -EINVAL; |
| |
| size = vma->vm_end - vma->vm_start; |
| |
| lock_sock(sk); |
| if (po->pg_vec == NULL) |
| goto out; |
| if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE) |
| goto out; |
| |
| start = vma->vm_start; |
| for (i = 0; i < po->pg_vec_len; i++) { |
| struct page *page = virt_to_page(po->pg_vec[i]); |
| int pg_num; |
| |
| for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) { |
| err = vm_insert_page(vma, start, page); |
| if (unlikely(err)) |
| goto out; |
| start += PAGE_SIZE; |
| } |
| } |
| atomic_inc(&po->mapped); |
| vma->vm_ops = &packet_mmap_ops; |
| err = 0; |
| |
| out: |
| release_sock(sk); |
| return err; |
| } |
| #endif |
| |
| |
| #ifdef CONFIG_SOCK_PACKET |
| static const struct proto_ops packet_ops_spkt = { |
| .family = PF_PACKET, |
| .owner = THIS_MODULE, |
| .release = packet_release, |
| .bind = packet_bind_spkt, |
| .connect = sock_no_connect, |
| .socketpair = sock_no_socketpair, |
| .accept = sock_no_accept, |
| .getname = packet_getname_spkt, |
| .poll = datagram_poll, |
| .ioctl = packet_ioctl, |
| .listen = sock_no_listen, |
| .shutdown = sock_no_shutdown, |
| .setsockopt = sock_no_setsockopt, |
| .getsockopt = sock_no_getsockopt, |
| .sendmsg = packet_sendmsg_spkt, |
| .recvmsg = packet_recvmsg, |
| .mmap = sock_no_mmap, |
| .sendpage = sock_no_sendpage, |
| }; |
| #endif |
| |
| static const struct proto_ops packet_ops = { |
| .family = PF_PACKET, |
| .owner = THIS_MODULE, |
| .release = packet_release, |
| .bind = packet_bind, |
| .connect = sock_no_connect, |
| .socketpair = sock_no_socketpair, |
| .accept = sock_no_accept, |
| .getname = packet_getname, |
| .poll = packet_poll, |
| .ioctl = packet_ioctl, |
| .listen = sock_no_listen, |
| .shutdown = sock_no_shutdown, |
| .setsockopt = packet_setsockopt, |
| .getsockopt = packet_getsockopt, |
| .sendmsg = packet_sendmsg, |
| .recvmsg = packet_recvmsg, |
| .mmap = packet_mmap, |
| .sendpage = sock_no_sendpage, |
| }; |
| |
| static struct net_proto_family packet_family_ops = { |
| .family = PF_PACKET, |
| .create = packet_create, |
| .owner = THIS_MODULE, |
| }; |
| |
| static struct notifier_block packet_netdev_notifier = { |
| .notifier_call =packet_notifier, |
| }; |
| |
| #ifdef CONFIG_PROC_FS |
| static inline struct sock *packet_seq_idx(loff_t off) |
| { |
| struct sock *s; |
| struct hlist_node *node; |
| |
| sk_for_each(s, node, &packet_sklist) { |
| if (!off--) |
| return s; |
| } |
| return NULL; |
| } |
| |
| static void *packet_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| read_lock(&packet_sklist_lock); |
| return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN; |
| } |
| |
| static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| ++*pos; |
| return (v == SEQ_START_TOKEN) |
| ? sk_head(&packet_sklist) |
| : sk_next((struct sock*)v) ; |
| } |
| |
| static void packet_seq_stop(struct seq_file *seq, void *v) |
| { |
| read_unlock(&packet_sklist_lock); |
| } |
| |
| static int packet_seq_show(struct seq_file *seq, void *v) |
| { |
| if (v == SEQ_START_TOKEN) |
| seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); |
| else { |
| struct sock *s = v; |
| const struct packet_sock *po = pkt_sk(s); |
| |
| seq_printf(seq, |
| "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
| s, |
| atomic_read(&s->sk_refcnt), |
| s->sk_type, |
| ntohs(po->num), |
| po->ifindex, |
| po->running, |
| atomic_read(&s->sk_rmem_alloc), |
| sock_i_uid(s), |
| sock_i_ino(s) ); |
| } |
| |
| return 0; |
| } |
| |
| static struct seq_operations packet_seq_ops = { |
| .start = packet_seq_start, |
| .next = packet_seq_next, |
| .stop = packet_seq_stop, |
| .show = packet_seq_show, |
| }; |
| |
| static int packet_seq_open(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &packet_seq_ops); |
| } |
| |
| static const struct file_operations packet_seq_fops = { |
| .owner = THIS_MODULE, |
| .open = packet_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| |
| #endif |
| |
| static void __exit packet_exit(void) |
| { |
| proc_net_remove("packet"); |
| unregister_netdevice_notifier(&packet_netdev_notifier); |
| sock_unregister(PF_PACKET); |
| proto_unregister(&packet_proto); |
| } |
| |
| static int __init packet_init(void) |
| { |
| int rc = proto_register(&packet_proto, 0); |
| |
| if (rc != 0) |
| goto out; |
| |
| sock_register(&packet_family_ops); |
| register_netdevice_notifier(&packet_netdev_notifier); |
| proc_net_fops_create("packet", 0, &packet_seq_fops); |
| out: |
| return rc; |
| } |
| |
| module_init(packet_init); |
| module_exit(packet_exit); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_NETPROTO(PF_PACKET); |