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.
6 * PACKET - implements raw packet sockets.
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
13 * Alan Cox : verify_area() now used correctly
14 * Alan Cox : new skbuff lists, look ma no backlogs!
15 * Alan Cox : tidied skbuff lists.
16 * Alan Cox : Now uses generic datagram routines I
17 * added. Also fixed the peek/read crash
18 * from all old Linux datagram code.
19 * Alan Cox : Uses the improved datagram code.
20 * Alan Cox : Added NULL's for socket options.
21 * Alan Cox : Re-commented the code.
22 * Alan Cox : Use new kernel side addressing
23 * Rob Janssen : Correct MTU usage.
24 * Dave Platt : Counter leaks caused by incorrect
25 * interrupt locking and some slightly
26 * dubious gcc output. Can you read
27 * compiler: it said _VOLATILE_
28 * Richard Kooijman : Timestamp fixes.
29 * Alan Cox : New buffers. Use sk->mac.raw.
30 * Alan Cox : sendmsg/recvmsg support.
31 * Alan Cox : Protocol setting support
32 * Alexey Kuznetsov : Untied from IPv4 stack.
33 * Cyrus Durgin : Fixed kerneld for kmod.
34 * Michal Ostrowski : Module initialization cleanup.
35 * Ulises Alonso : Frame number limit removal and
36 * packet_set_ring memory leak.
37 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
40 * byte arrays at the end of sockaddr_ll
43 * This program is free software; you can redistribute it and/or
44 * modify it under the terms of the GNU General Public License
45 * as published by the Free Software Foundation; either version
46 * 2 of the License, or (at your option) any later version.
50 #include <linux/types.h>
52 #include <linux/capability.h>
53 #include <linux/fcntl.h>
54 #include <linux/socket.h>
56 #include <linux/inet.h>
57 #include <linux/netdevice.h>
58 #include <linux/if_packet.h>
59 #include <linux/wireless.h>
60 #include <linux/kernel.h>
61 #include <linux/kmod.h>
62 #include <net/net_namespace.h>
64 #include <net/protocol.h>
65 #include <linux/skbuff.h>
67 #include <linux/errno.h>
68 #include <linux/timer.h>
69 #include <asm/system.h>
70 #include <asm/uaccess.h>
71 #include <asm/ioctls.h>
73 #include <asm/cacheflush.h>
75 #include <linux/proc_fs.h>
76 #include <linux/seq_file.h>
77 #include <linux/poll.h>
78 #include <linux/module.h>
79 #include <linux/init.h>
82 #include <net/inet_common.h>
87 - if device has no dev->hard_header routine, it adds and removes ll header
88 inside itself. In this case ll header is invisible outside of device,
89 but higher levels still should reserve dev->hard_header_len.
90 Some devices are enough clever to reallocate skb, when header
91 will not fit to reserved space (tunnel), another ones are silly
93 - packet socket receives packets with pulled ll header,
94 so that SOCK_RAW should push it back.
99 Incoming, dev->hard_header!=NULL
100 mac_header -> ll header
103 Outgoing, dev->hard_header!=NULL
104 mac_header -> ll header
107 Incoming, dev->hard_header==NULL
108 mac_header -> UNKNOWN position. It is very likely, that it points to ll
109 header. PPP makes it, that is wrong, because introduce
110 assymetry between rx and tx paths.
113 Outgoing, dev->hard_header==NULL
114 mac_header -> data. ll header is still not built!
118 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
124 dev->hard_header != NULL
125 mac_header -> ll header
128 dev->hard_header == NULL (ll header is added by device, we cannot control it)
132 We should set nh.raw on output to correct posistion,
133 packet classifier depends on it.
136 /* Private packet socket structures. */
140 struct packet_mclist *next;
145 unsigned char addr[MAX_ADDR_LEN];
147 /* identical to struct packet_mreq except it has
148 * a longer address field.
150 struct packet_mreq_max
153 unsigned short mr_type;
154 unsigned short mr_alen;
155 unsigned char mr_address[MAX_ADDR_LEN];
158 #ifdef CONFIG_PACKET_MMAP
159 static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing);
162 static void packet_flush_mclist(struct sock *sk);
165 /* struct sock has to be the first member of packet_sock */
167 struct tpacket_stats stats;
168 #ifdef CONFIG_PACKET_MMAP
171 unsigned int frames_per_block;
172 unsigned int frame_size;
173 unsigned int frame_max;
176 struct packet_type prot_hook;
177 spinlock_t bind_lock;
178 unsigned int running:1, /* prot_hook is attached*/
181 int ifindex; /* bound device */
183 struct packet_mclist *mclist;
184 #ifdef CONFIG_PACKET_MMAP
186 unsigned int pg_vec_order;
187 unsigned int pg_vec_pages;
188 unsigned int pg_vec_len;
189 enum tpacket_versions tp_version;
190 unsigned int tp_hdrlen;
194 struct packet_skb_cb {
195 unsigned int origlen;
197 struct sockaddr_pkt pkt;
198 struct sockaddr_ll ll;
202 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
204 #ifdef CONFIG_PACKET_MMAP
206 static void *packet_lookup_frame(struct packet_sock *po, unsigned int position,
209 unsigned int pg_vec_pos, frame_offset;
211 struct tpacket_hdr *h1;
212 struct tpacket2_hdr *h2;
216 pg_vec_pos = position / po->frames_per_block;
217 frame_offset = position % po->frames_per_block;
219 h.raw = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size);
220 switch (po->tp_version) {
222 if (status != h.h1->tp_status ? TP_STATUS_USER :
227 if (status != h.h2->tp_status ? TP_STATUS_USER :
235 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
238 struct tpacket_hdr *h1;
239 struct tpacket2_hdr *h2;
244 switch (po->tp_version) {
246 h.h1->tp_status = status;
249 h.h2->tp_status = status;
255 static inline struct packet_sock *pkt_sk(struct sock *sk)
257 return (struct packet_sock *)sk;
260 static void packet_sock_destruct(struct sock *sk)
262 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
263 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
265 if (!sock_flag(sk, SOCK_DEAD)) {
266 printk("Attempt to release alive packet socket: %p\n", sk);
270 sk_refcnt_debug_dec(sk);
274 static const struct proto_ops packet_ops;
276 static const struct proto_ops packet_ops_spkt;
278 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
281 struct sockaddr_pkt *spkt;
284 * When we registered the protocol we saved the socket in the data
285 * field for just this event.
288 sk = pt->af_packet_priv;
291 * Yank back the headers [hope the device set this
292 * right or kerboom...]
294 * Incoming packets have ll header pulled,
297 * For outgoing ones skb->data == skb_mac_header(skb)
298 * so that this procedure is noop.
301 if (skb->pkt_type == PACKET_LOOPBACK)
304 if (dev_net(dev) != sock_net(sk))
307 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
310 /* drop any routing info */
311 dst_release(skb->dst);
314 /* drop conntrack reference */
317 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
319 skb_push(skb, skb->data - skb_mac_header(skb));
322 * The SOCK_PACKET socket receives _all_ frames.
325 spkt->spkt_family = dev->type;
326 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
327 spkt->spkt_protocol = skb->protocol;
330 * Charge the memory to the socket. This is done specifically
331 * to prevent sockets using all the memory up.
334 if (sock_queue_rcv_skb(sk,skb) == 0)
345 * Output a raw packet to a device layer. This bypasses all the other
346 * protocol layers and you must therefore supply it with a complete frame
349 static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
350 struct msghdr *msg, size_t len)
352 struct sock *sk = sock->sk;
353 struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name;
355 struct net_device *dev;
360 * Get and verify the address.
365 if (msg->msg_namelen < sizeof(struct sockaddr))
367 if (msg->msg_namelen==sizeof(struct sockaddr_pkt))
368 proto=saddr->spkt_protocol;
371 return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */
374 * Find the device first to size check it
377 saddr->spkt_device[13] = 0;
378 dev = dev_get_by_name(sock_net(sk), saddr->spkt_device);
384 if (!(dev->flags & IFF_UP))
388 * You may not queue a frame bigger than the mtu. This is the lowest level
389 * raw protocol and you must do your own fragmentation at this level.
393 if (len > dev->mtu + dev->hard_header_len)
397 skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);
400 * If the write buffer is full, then tough. At this level the user gets to
401 * deal with the problem - do your own algorithmic backoffs. That's far
412 /* FIXME: Save some space for broken drivers that write a
413 * hard header at transmission time by themselves. PPP is the
414 * notable one here. This should really be fixed at the driver level.
416 skb_reserve(skb, LL_RESERVED_SPACE(dev));
417 skb_reset_network_header(skb);
419 /* Try to align data part correctly */
420 if (dev->header_ops) {
421 skb->data -= dev->hard_header_len;
422 skb->tail -= dev->hard_header_len;
423 if (len < dev->hard_header_len)
424 skb_reset_network_header(skb);
427 /* Returns -EFAULT on error */
428 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
429 skb->protocol = proto;
431 skb->priority = sk->sk_priority;
451 static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
454 struct sk_filter *filter;
457 filter = rcu_dereference(sk->sk_filter);
459 res = sk_run_filter(skb, filter->insns, filter->len);
460 rcu_read_unlock_bh();
466 This function makes lazy skb cloning in hope that most of packets
467 are discarded by BPF.
469 Note tricky part: we DO mangle shared skb! skb->data, skb->len
470 and skb->cb are mangled. It works because (and until) packets
471 falling here are owned by current CPU. Output packets are cloned
472 by dev_queue_xmit_nit(), input packets are processed by net_bh
473 sequencially, so that if we return skb to original state on exit,
474 we will not harm anyone.
477 static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
480 struct sockaddr_ll *sll;
481 struct packet_sock *po;
482 u8 * skb_head = skb->data;
483 int skb_len = skb->len;
484 unsigned int snaplen, res;
486 if (skb->pkt_type == PACKET_LOOPBACK)
489 sk = pt->af_packet_priv;
492 if (dev_net(dev) != sock_net(sk))
497 if (dev->header_ops) {
498 /* The device has an explicit notion of ll header,
499 exported to higher levels.
501 Otherwise, the device hides datails of it frame
502 structure, so that corresponding packet head
503 never delivered to user.
505 if (sk->sk_type != SOCK_DGRAM)
506 skb_push(skb, skb->data - skb_mac_header(skb));
507 else if (skb->pkt_type == PACKET_OUTGOING) {
508 /* Special case: outgoing packets have ll header at head */
509 skb_pull(skb, skb_network_offset(skb));
515 res = run_filter(skb, sk, snaplen);
521 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
522 (unsigned)sk->sk_rcvbuf)
525 if (skb_shared(skb)) {
526 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
530 if (skb_head != skb->data) {
531 skb->data = skb_head;
538 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
541 sll = &PACKET_SKB_CB(skb)->sa.ll;
542 sll->sll_family = AF_PACKET;
543 sll->sll_hatype = dev->type;
544 sll->sll_protocol = skb->protocol;
545 sll->sll_pkttype = skb->pkt_type;
546 if (unlikely(po->origdev))
547 sll->sll_ifindex = orig_dev->ifindex;
549 sll->sll_ifindex = dev->ifindex;
551 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
553 PACKET_SKB_CB(skb)->origlen = skb->len;
555 if (pskb_trim(skb, snaplen))
558 skb_set_owner_r(skb, sk);
560 dst_release(skb->dst);
563 /* drop conntrack reference */
566 spin_lock(&sk->sk_receive_queue.lock);
567 po->stats.tp_packets++;
568 __skb_queue_tail(&sk->sk_receive_queue, skb);
569 spin_unlock(&sk->sk_receive_queue.lock);
570 sk->sk_data_ready(sk, skb->len);
574 spin_lock(&sk->sk_receive_queue.lock);
575 po->stats.tp_drops++;
576 spin_unlock(&sk->sk_receive_queue.lock);
579 if (skb_head != skb->data && skb_shared(skb)) {
580 skb->data = skb_head;
588 #ifdef CONFIG_PACKET_MMAP
589 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
592 struct packet_sock *po;
593 struct sockaddr_ll *sll;
595 struct tpacket_hdr *h1;
596 struct tpacket2_hdr *h2;
599 u8 * skb_head = skb->data;
600 int skb_len = skb->len;
601 unsigned int snaplen, res;
602 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
603 unsigned short macoff, netoff, hdrlen;
604 struct sk_buff *copy_skb = NULL;
608 if (skb->pkt_type == PACKET_LOOPBACK)
611 sk = pt->af_packet_priv;
614 if (dev_net(dev) != sock_net(sk))
617 if (dev->header_ops) {
618 if (sk->sk_type != SOCK_DGRAM)
619 skb_push(skb, skb->data - skb_mac_header(skb));
620 else if (skb->pkt_type == PACKET_OUTGOING) {
621 /* Special case: outgoing packets have ll header at head */
622 skb_pull(skb, skb_network_offset(skb));
626 if (skb->ip_summed == CHECKSUM_PARTIAL)
627 status |= TP_STATUS_CSUMNOTREADY;
631 res = run_filter(skb, sk, snaplen);
637 if (sk->sk_type == SOCK_DGRAM) {
638 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16;
640 unsigned maclen = skb_network_offset(skb);
641 netoff = TPACKET_ALIGN(po->tp_hdrlen +
642 (maclen < 16 ? 16 : maclen));
643 macoff = netoff - maclen;
646 if (macoff + snaplen > po->frame_size) {
647 if (po->copy_thresh &&
648 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
649 (unsigned)sk->sk_rcvbuf) {
650 if (skb_shared(skb)) {
651 copy_skb = skb_clone(skb, GFP_ATOMIC);
653 copy_skb = skb_get(skb);
654 skb_head = skb->data;
657 skb_set_owner_r(copy_skb, sk);
659 snaplen = po->frame_size - macoff;
660 if ((int)snaplen < 0)
664 spin_lock(&sk->sk_receive_queue.lock);
665 h.raw = packet_lookup_frame(po, po->head, TP_STATUS_KERNEL);
668 po->head = po->head != po->frame_max ? po->head+1 : 0;
669 po->stats.tp_packets++;
671 status |= TP_STATUS_COPY;
672 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
674 if (!po->stats.tp_drops)
675 status &= ~TP_STATUS_LOSING;
676 spin_unlock(&sk->sk_receive_queue.lock);
678 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
680 switch (po->tp_version) {
682 h.h1->tp_len = skb->len;
683 h.h1->tp_snaplen = snaplen;
684 h.h1->tp_mac = macoff;
685 h.h1->tp_net = netoff;
686 if (skb->tstamp.tv64)
687 tv = ktime_to_timeval(skb->tstamp);
689 do_gettimeofday(&tv);
690 h.h1->tp_sec = tv.tv_sec;
691 h.h1->tp_usec = tv.tv_usec;
692 hdrlen = sizeof(*h.h1);
695 h.h2->tp_len = skb->len;
696 h.h2->tp_snaplen = snaplen;
697 h.h2->tp_mac = macoff;
698 h.h2->tp_net = netoff;
699 if (skb->tstamp.tv64)
700 ts = ktime_to_timespec(skb->tstamp);
703 h.h2->tp_sec = ts.tv_sec;
704 h.h2->tp_nsec = ts.tv_nsec;
705 hdrlen = sizeof(*h.h2);
711 sll = h.raw + TPACKET_ALIGN(hdrlen);
712 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
713 sll->sll_family = AF_PACKET;
714 sll->sll_hatype = dev->type;
715 sll->sll_protocol = skb->protocol;
716 sll->sll_pkttype = skb->pkt_type;
717 if (unlikely(po->origdev))
718 sll->sll_ifindex = orig_dev->ifindex;
720 sll->sll_ifindex = dev->ifindex;
722 __packet_set_status(po, h.raw, status);
726 struct page *p_start, *p_end;
727 u8 *h_end = h.raw + macoff + snaplen - 1;
729 p_start = virt_to_page(h.raw);
730 p_end = virt_to_page(h_end);
731 while (p_start <= p_end) {
732 flush_dcache_page(p_start);
737 sk->sk_data_ready(sk, 0);
740 if (skb_head != skb->data && skb_shared(skb)) {
741 skb->data = skb_head;
749 po->stats.tp_drops++;
750 spin_unlock(&sk->sk_receive_queue.lock);
752 sk->sk_data_ready(sk, 0);
761 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
762 struct msghdr *msg, size_t len)
764 struct sock *sk = sock->sk;
765 struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name;
767 struct net_device *dev;
770 int ifindex, err, reserve = 0;
773 * Get and verify the address.
777 struct packet_sock *po = pkt_sk(sk);
779 ifindex = po->ifindex;
784 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
786 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
788 ifindex = saddr->sll_ifindex;
789 proto = saddr->sll_protocol;
790 addr = saddr->sll_addr;
794 dev = dev_get_by_index(sock_net(sk), ifindex);
798 if (sock->type == SOCK_RAW)
799 reserve = dev->hard_header_len;
802 if (!(dev->flags & IFF_UP))
806 if (len > dev->mtu+reserve)
809 skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
810 msg->msg_flags & MSG_DONTWAIT, &err);
814 skb_reserve(skb, LL_RESERVED_SPACE(dev));
815 skb_reset_network_header(skb);
818 if (sock->type == SOCK_DGRAM &&
819 dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
822 /* Returns -EFAULT on error */
823 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
827 skb->protocol = proto;
829 skb->priority = sk->sk_priority;
835 err = dev_queue_xmit(skb);
836 if (err > 0 && (err = net_xmit_errno(err)) != 0)
853 * Close a PACKET socket. This is fairly simple. We immediately go
854 * to 'closed' state and remove our protocol entry in the device list.
857 static int packet_release(struct socket *sock)
859 struct sock *sk = sock->sk;
860 struct packet_sock *po;
869 write_lock_bh(&net->packet.sklist_lock);
870 sk_del_node_init(sk);
871 write_unlock_bh(&net->packet.sklist_lock);
874 * Unhook packet receive handler.
879 * Remove the protocol hook
881 dev_remove_pack(&po->prot_hook);
887 packet_flush_mclist(sk);
889 #ifdef CONFIG_PACKET_MMAP
891 struct tpacket_req req;
892 memset(&req, 0, sizeof(req));
893 packet_set_ring(sk, &req, 1);
898 * Now the socket is dead. No more input will appear.
906 skb_queue_purge(&sk->sk_receive_queue);
907 sk_refcnt_debug_release(sk);
914 * Attach a packet hook.
917 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
919 struct packet_sock *po = pkt_sk(sk);
921 * Detach an existing hook if present.
926 spin_lock(&po->bind_lock);
931 spin_unlock(&po->bind_lock);
932 dev_remove_pack(&po->prot_hook);
933 spin_lock(&po->bind_lock);
937 po->prot_hook.type = protocol;
938 po->prot_hook.dev = dev;
940 po->ifindex = dev ? dev->ifindex : 0;
945 if (!dev || (dev->flags & IFF_UP)) {
946 dev_add_pack(&po->prot_hook);
950 sk->sk_err = ENETDOWN;
951 if (!sock_flag(sk, SOCK_DEAD))
952 sk->sk_error_report(sk);
956 spin_unlock(&po->bind_lock);
962 * Bind a packet socket to a device
965 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len)
967 struct sock *sk=sock->sk;
969 struct net_device *dev;
976 if (addr_len != sizeof(struct sockaddr))
978 strlcpy(name,uaddr->sa_data,sizeof(name));
980 dev = dev_get_by_name(sock_net(sk), name);
982 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
988 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
990 struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
991 struct sock *sk=sock->sk;
992 struct net_device *dev = NULL;
1000 if (addr_len < sizeof(struct sockaddr_ll))
1002 if (sll->sll_family != AF_PACKET)
1005 if (sll->sll_ifindex) {
1007 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1011 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1019 static struct proto packet_proto = {
1021 .owner = THIS_MODULE,
1022 .obj_size = sizeof(struct packet_sock),
1026 * Create a packet of type SOCK_PACKET.
1029 static int packet_create(struct net *net, struct socket *sock, int protocol)
1032 struct packet_sock *po;
1033 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1036 if (!capable(CAP_NET_RAW))
1038 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1039 sock->type != SOCK_PACKET)
1040 return -ESOCKTNOSUPPORT;
1042 sock->state = SS_UNCONNECTED;
1045 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1049 sock->ops = &packet_ops;
1050 if (sock->type == SOCK_PACKET)
1051 sock->ops = &packet_ops_spkt;
1053 sock_init_data(sock, sk);
1056 sk->sk_family = PF_PACKET;
1059 sk->sk_destruct = packet_sock_destruct;
1060 sk_refcnt_debug_inc(sk);
1063 * Attach a protocol block
1066 spin_lock_init(&po->bind_lock);
1067 po->prot_hook.func = packet_rcv;
1069 if (sock->type == SOCK_PACKET)
1070 po->prot_hook.func = packet_rcv_spkt;
1072 po->prot_hook.af_packet_priv = sk;
1075 po->prot_hook.type = proto;
1076 dev_add_pack(&po->prot_hook);
1081 write_lock_bh(&net->packet.sklist_lock);
1082 sk_add_node(sk, &net->packet.sklist);
1083 write_unlock_bh(&net->packet.sklist_lock);
1090 * Pull a packet from our receive queue and hand it to the user.
1091 * If necessary we block.
1094 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1095 struct msghdr *msg, size_t len, int flags)
1097 struct sock *sk = sock->sk;
1098 struct sk_buff *skb;
1100 struct sockaddr_ll *sll;
1103 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
1107 /* What error should we return now? EUNATTACH? */
1108 if (pkt_sk(sk)->ifindex < 0)
1113 * Call the generic datagram receiver. This handles all sorts
1114 * of horrible races and re-entrancy so we can forget about it
1115 * in the protocol layers.
1117 * Now it will return ENETDOWN, if device have just gone down,
1118 * but then it will block.
1121 skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err);
1124 * An error occurred so return it. Because skb_recv_datagram()
1125 * handles the blocking we don't see and worry about blocking
1133 * If the address length field is there to be filled in, we fill
1137 sll = &PACKET_SKB_CB(skb)->sa.ll;
1138 if (sock->type == SOCK_PACKET)
1139 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1141 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1144 * You lose any data beyond the buffer you gave. If it worries a
1145 * user program they can ask the device for its MTU anyway.
1152 msg->msg_flags|=MSG_TRUNC;
1155 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1159 sock_recv_timestamp(msg, sk, skb);
1162 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1165 if (pkt_sk(sk)->auxdata) {
1166 struct tpacket_auxdata aux;
1168 aux.tp_status = TP_STATUS_USER;
1169 if (skb->ip_summed == CHECKSUM_PARTIAL)
1170 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1171 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1172 aux.tp_snaplen = skb->len;
1174 aux.tp_net = skb_network_offset(skb);
1176 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1180 * Free or return the buffer as appropriate. Again this
1181 * hides all the races and re-entrancy issues from us.
1183 err = (flags&MSG_TRUNC) ? skb->len : copied;
1186 skb_free_datagram(sk, skb);
1191 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1192 int *uaddr_len, int peer)
1194 struct net_device *dev;
1195 struct sock *sk = sock->sk;
1200 uaddr->sa_family = AF_PACKET;
1201 dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex);
1203 strlcpy(uaddr->sa_data, dev->name, 15);
1206 memset(uaddr->sa_data, 0, 14);
1207 *uaddr_len = sizeof(*uaddr);
1212 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1213 int *uaddr_len, int peer)
1215 struct net_device *dev;
1216 struct sock *sk = sock->sk;
1217 struct packet_sock *po = pkt_sk(sk);
1218 struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
1223 sll->sll_family = AF_PACKET;
1224 sll->sll_ifindex = po->ifindex;
1225 sll->sll_protocol = po->num;
1226 dev = dev_get_by_index(sock_net(sk), po->ifindex);
1228 sll->sll_hatype = dev->type;
1229 sll->sll_halen = dev->addr_len;
1230 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1233 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1236 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1241 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1245 case PACKET_MR_MULTICAST:
1247 dev_mc_add(dev, i->addr, i->alen, 0);
1249 dev_mc_delete(dev, i->addr, i->alen, 0);
1251 case PACKET_MR_PROMISC:
1252 return dev_set_promiscuity(dev, what);
1254 case PACKET_MR_ALLMULTI:
1255 return dev_set_allmulti(dev, what);
1262 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1264 for ( ; i; i=i->next) {
1265 if (i->ifindex == dev->ifindex)
1266 packet_dev_mc(dev, i, what);
1270 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1272 struct packet_sock *po = pkt_sk(sk);
1273 struct packet_mclist *ml, *i;
1274 struct net_device *dev;
1280 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1285 if (mreq->mr_alen > dev->addr_len)
1289 i = kmalloc(sizeof(*i), GFP_KERNEL);
1294 for (ml = po->mclist; ml; ml = ml->next) {
1295 if (ml->ifindex == mreq->mr_ifindex &&
1296 ml->type == mreq->mr_type &&
1297 ml->alen == mreq->mr_alen &&
1298 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1300 /* Free the new element ... */
1306 i->type = mreq->mr_type;
1307 i->ifindex = mreq->mr_ifindex;
1308 i->alen = mreq->mr_alen;
1309 memcpy(i->addr, mreq->mr_address, i->alen);
1311 i->next = po->mclist;
1313 err = packet_dev_mc(dev, i, 1);
1315 po->mclist = i->next;
1324 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1326 struct packet_mclist *ml, **mlp;
1330 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1331 if (ml->ifindex == mreq->mr_ifindex &&
1332 ml->type == mreq->mr_type &&
1333 ml->alen == mreq->mr_alen &&
1334 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1335 if (--ml->count == 0) {
1336 struct net_device *dev;
1338 dev = dev_get_by_index(sock_net(sk), ml->ifindex);
1340 packet_dev_mc(dev, ml, -1);
1350 return -EADDRNOTAVAIL;
1353 static void packet_flush_mclist(struct sock *sk)
1355 struct packet_sock *po = pkt_sk(sk);
1356 struct packet_mclist *ml;
1362 while ((ml = po->mclist) != NULL) {
1363 struct net_device *dev;
1365 po->mclist = ml->next;
1366 if ((dev = dev_get_by_index(sock_net(sk), ml->ifindex)) != NULL) {
1367 packet_dev_mc(dev, ml, -1);
1376 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1378 struct sock *sk = sock->sk;
1379 struct packet_sock *po = pkt_sk(sk);
1382 if (level != SOL_PACKET)
1383 return -ENOPROTOOPT;
1386 case PACKET_ADD_MEMBERSHIP:
1387 case PACKET_DROP_MEMBERSHIP:
1389 struct packet_mreq_max mreq;
1391 memset(&mreq, 0, sizeof(mreq));
1392 if (len < sizeof(struct packet_mreq))
1394 if (len > sizeof(mreq))
1396 if (copy_from_user(&mreq,optval,len))
1398 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1400 if (optname == PACKET_ADD_MEMBERSHIP)
1401 ret = packet_mc_add(sk, &mreq);
1403 ret = packet_mc_drop(sk, &mreq);
1407 #ifdef CONFIG_PACKET_MMAP
1408 case PACKET_RX_RING:
1410 struct tpacket_req req;
1412 if (optlen<sizeof(req))
1414 if (copy_from_user(&req,optval,sizeof(req)))
1416 return packet_set_ring(sk, &req, 0);
1418 case PACKET_COPY_THRESH:
1422 if (optlen!=sizeof(val))
1424 if (copy_from_user(&val,optval,sizeof(val)))
1427 pkt_sk(sk)->copy_thresh = val;
1430 case PACKET_VERSION:
1434 if (optlen != sizeof(val))
1438 if (copy_from_user(&val, optval, sizeof(val)))
1443 po->tp_version = val;
1450 case PACKET_AUXDATA:
1454 if (optlen < sizeof(val))
1456 if (copy_from_user(&val, optval, sizeof(val)))
1459 po->auxdata = !!val;
1462 case PACKET_ORIGDEV:
1466 if (optlen < sizeof(val))
1468 if (copy_from_user(&val, optval, sizeof(val)))
1471 po->origdev = !!val;
1475 return -ENOPROTOOPT;
1479 static int packet_getsockopt(struct socket *sock, int level, int optname,
1480 char __user *optval, int __user *optlen)
1484 struct sock *sk = sock->sk;
1485 struct packet_sock *po = pkt_sk(sk);
1487 struct tpacket_stats st;
1489 if (level != SOL_PACKET)
1490 return -ENOPROTOOPT;
1492 if (get_user(len, optlen))
1499 case PACKET_STATISTICS:
1500 if (len > sizeof(struct tpacket_stats))
1501 len = sizeof(struct tpacket_stats);
1502 spin_lock_bh(&sk->sk_receive_queue.lock);
1504 memset(&po->stats, 0, sizeof(st));
1505 spin_unlock_bh(&sk->sk_receive_queue.lock);
1506 st.tp_packets += st.tp_drops;
1510 case PACKET_AUXDATA:
1511 if (len > sizeof(int))
1517 case PACKET_ORIGDEV:
1518 if (len > sizeof(int))
1524 #ifdef CONFIG_PACKET_MMAP
1525 case PACKET_VERSION:
1526 if (len > sizeof(int))
1528 val = po->tp_version;
1532 if (len > sizeof(int))
1534 if (copy_from_user(&val, optval, len))
1538 val = sizeof(struct tpacket_hdr);
1541 val = sizeof(struct tpacket2_hdr);
1550 return -ENOPROTOOPT;
1553 if (put_user(len, optlen))
1555 if (copy_to_user(optval, data, len))
1561 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
1564 struct hlist_node *node;
1565 struct net_device *dev = data;
1566 struct net *net = dev_net(dev);
1568 read_lock(&net->packet.sklist_lock);
1569 sk_for_each(sk, node, &net->packet.sklist) {
1570 struct packet_sock *po = pkt_sk(sk);
1573 case NETDEV_UNREGISTER:
1575 packet_dev_mclist(dev, po->mclist, -1);
1579 if (dev->ifindex == po->ifindex) {
1580 spin_lock(&po->bind_lock);
1582 __dev_remove_pack(&po->prot_hook);
1585 sk->sk_err = ENETDOWN;
1586 if (!sock_flag(sk, SOCK_DEAD))
1587 sk->sk_error_report(sk);
1589 if (msg == NETDEV_UNREGISTER) {
1591 po->prot_hook.dev = NULL;
1593 spin_unlock(&po->bind_lock);
1597 spin_lock(&po->bind_lock);
1598 if (dev->ifindex == po->ifindex && po->num &&
1600 dev_add_pack(&po->prot_hook);
1604 spin_unlock(&po->bind_lock);
1608 read_unlock(&net->packet.sklist_lock);
1613 static int packet_ioctl(struct socket *sock, unsigned int cmd,
1616 struct sock *sk = sock->sk;
1621 int amount = atomic_read(&sk->sk_wmem_alloc);
1622 return put_user(amount, (int __user *)arg);
1626 struct sk_buff *skb;
1629 spin_lock_bh(&sk->sk_receive_queue.lock);
1630 skb = skb_peek(&sk->sk_receive_queue);
1633 spin_unlock_bh(&sk->sk_receive_queue.lock);
1634 return put_user(amount, (int __user *)arg);
1637 return sock_get_timestamp(sk, (struct timeval __user *)arg);
1639 return sock_get_timestampns(sk, (struct timespec __user *)arg);
1649 case SIOCGIFBRDADDR:
1650 case SIOCSIFBRDADDR:
1651 case SIOCGIFNETMASK:
1652 case SIOCSIFNETMASK:
1653 case SIOCGIFDSTADDR:
1654 case SIOCSIFDSTADDR:
1656 if (sock_net(sk) != &init_net)
1657 return -ENOIOCTLCMD;
1658 return inet_dgram_ops.ioctl(sock, cmd, arg);
1662 return -ENOIOCTLCMD;
1667 #ifndef CONFIG_PACKET_MMAP
1668 #define packet_mmap sock_no_mmap
1669 #define packet_poll datagram_poll
1672 static unsigned int packet_poll(struct file * file, struct socket *sock,
1675 struct sock *sk = sock->sk;
1676 struct packet_sock *po = pkt_sk(sk);
1677 unsigned int mask = datagram_poll(file, sock, wait);
1679 spin_lock_bh(&sk->sk_receive_queue.lock);
1681 unsigned last = po->head ? po->head-1 : po->frame_max;
1683 if (packet_lookup_frame(po, last, TP_STATUS_USER))
1684 mask |= POLLIN | POLLRDNORM;
1686 spin_unlock_bh(&sk->sk_receive_queue.lock);
1691 /* Dirty? Well, I still did not learn better way to account
1695 static void packet_mm_open(struct vm_area_struct *vma)
1697 struct file *file = vma->vm_file;
1698 struct socket * sock = file->private_data;
1699 struct sock *sk = sock->sk;
1702 atomic_inc(&pkt_sk(sk)->mapped);
1705 static void packet_mm_close(struct vm_area_struct *vma)
1707 struct file *file = vma->vm_file;
1708 struct socket * sock = file->private_data;
1709 struct sock *sk = sock->sk;
1712 atomic_dec(&pkt_sk(sk)->mapped);
1715 static struct vm_operations_struct packet_mmap_ops = {
1716 .open = packet_mm_open,
1717 .close =packet_mm_close,
1720 static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
1724 for (i = 0; i < len; i++) {
1725 if (likely(pg_vec[i]))
1726 free_pages((unsigned long) pg_vec[i], order);
1731 static inline char *alloc_one_pg_vec_page(unsigned long order)
1733 return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO,
1737 static char **alloc_pg_vec(struct tpacket_req *req, int order)
1739 unsigned int block_nr = req->tp_block_nr;
1743 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
1744 if (unlikely(!pg_vec))
1747 for (i = 0; i < block_nr; i++) {
1748 pg_vec[i] = alloc_one_pg_vec_page(order);
1749 if (unlikely(!pg_vec[i]))
1750 goto out_free_pgvec;
1757 free_pg_vec(pg_vec, order, block_nr);
1762 static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing)
1764 char **pg_vec = NULL;
1765 struct packet_sock *po = pkt_sk(sk);
1766 int was_running, order = 0;
1770 if (req->tp_block_nr) {
1773 /* Sanity tests and some calculations */
1775 if (unlikely(po->pg_vec))
1778 switch (po->tp_version) {
1780 po->tp_hdrlen = TPACKET_HDRLEN;
1783 po->tp_hdrlen = TPACKET2_HDRLEN;
1787 if (unlikely((int)req->tp_block_size <= 0))
1789 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
1791 if (unlikely(req->tp_frame_size < po->tp_hdrlen))
1793 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
1796 po->frames_per_block = req->tp_block_size/req->tp_frame_size;
1797 if (unlikely(po->frames_per_block <= 0))
1799 if (unlikely((po->frames_per_block * req->tp_block_nr) !=
1804 order = get_order(req->tp_block_size);
1805 pg_vec = alloc_pg_vec(req, order);
1806 if (unlikely(!pg_vec))
1809 for (i = 0; i < req->tp_block_nr; i++) {
1810 void *ptr = pg_vec[i];
1813 for (k = 0; k < po->frames_per_block; k++) {
1814 __packet_set_status(po, ptr, TP_STATUS_KERNEL);
1815 ptr += req->tp_frame_size;
1820 if (unlikely(req->tp_frame_nr))
1826 /* Detach socket from network */
1827 spin_lock(&po->bind_lock);
1828 was_running = po->running;
1831 __dev_remove_pack(&po->prot_hook);
1836 spin_unlock(&po->bind_lock);
1841 if (closing || atomic_read(&po->mapped) == 0) {
1843 #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
1845 spin_lock_bh(&sk->sk_receive_queue.lock);
1846 pg_vec = XC(po->pg_vec, pg_vec);
1847 po->frame_max = (req->tp_frame_nr - 1);
1849 po->frame_size = req->tp_frame_size;
1850 spin_unlock_bh(&sk->sk_receive_queue.lock);
1852 order = XC(po->pg_vec_order, order);
1853 req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr);
1855 po->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
1856 po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv;
1857 skb_queue_purge(&sk->sk_receive_queue);
1859 if (atomic_read(&po->mapped))
1860 printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped));
1863 spin_lock(&po->bind_lock);
1864 if (was_running && !po->running) {
1868 dev_add_pack(&po->prot_hook);
1870 spin_unlock(&po->bind_lock);
1875 free_pg_vec(pg_vec, order, req->tp_block_nr);
1880 static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1882 struct sock *sk = sock->sk;
1883 struct packet_sock *po = pkt_sk(sk);
1885 unsigned long start;
1892 size = vma->vm_end - vma->vm_start;
1895 if (po->pg_vec == NULL)
1897 if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE)
1900 start = vma->vm_start;
1901 for (i = 0; i < po->pg_vec_len; i++) {
1902 struct page *page = virt_to_page(po->pg_vec[i]);
1905 for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) {
1906 err = vm_insert_page(vma, start, page);
1912 atomic_inc(&po->mapped);
1913 vma->vm_ops = &packet_mmap_ops;
1923 static const struct proto_ops packet_ops_spkt = {
1924 .family = PF_PACKET,
1925 .owner = THIS_MODULE,
1926 .release = packet_release,
1927 .bind = packet_bind_spkt,
1928 .connect = sock_no_connect,
1929 .socketpair = sock_no_socketpair,
1930 .accept = sock_no_accept,
1931 .getname = packet_getname_spkt,
1932 .poll = datagram_poll,
1933 .ioctl = packet_ioctl,
1934 .listen = sock_no_listen,
1935 .shutdown = sock_no_shutdown,
1936 .setsockopt = sock_no_setsockopt,
1937 .getsockopt = sock_no_getsockopt,
1938 .sendmsg = packet_sendmsg_spkt,
1939 .recvmsg = packet_recvmsg,
1940 .mmap = sock_no_mmap,
1941 .sendpage = sock_no_sendpage,
1944 static const struct proto_ops packet_ops = {
1945 .family = PF_PACKET,
1946 .owner = THIS_MODULE,
1947 .release = packet_release,
1948 .bind = packet_bind,
1949 .connect = sock_no_connect,
1950 .socketpair = sock_no_socketpair,
1951 .accept = sock_no_accept,
1952 .getname = packet_getname,
1953 .poll = packet_poll,
1954 .ioctl = packet_ioctl,
1955 .listen = sock_no_listen,
1956 .shutdown = sock_no_shutdown,
1957 .setsockopt = packet_setsockopt,
1958 .getsockopt = packet_getsockopt,
1959 .sendmsg = packet_sendmsg,
1960 .recvmsg = packet_recvmsg,
1961 .mmap = packet_mmap,
1962 .sendpage = sock_no_sendpage,
1965 static struct net_proto_family packet_family_ops = {
1966 .family = PF_PACKET,
1967 .create = packet_create,
1968 .owner = THIS_MODULE,
1971 static struct notifier_block packet_netdev_notifier = {
1972 .notifier_call =packet_notifier,
1975 #ifdef CONFIG_PROC_FS
1976 static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
1979 struct hlist_node *node;
1981 sk_for_each(s, node, &net->packet.sklist) {
1988 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
1989 __acquires(seq_file_net(seq)->packet.sklist_lock)
1991 struct net *net = seq_file_net(seq);
1992 read_lock(&net->packet.sklist_lock);
1993 return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
1996 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1998 struct net *net = seq_file_net(seq);
2000 return (v == SEQ_START_TOKEN)
2001 ? sk_head(&net->packet.sklist)
2002 : sk_next((struct sock*)v) ;
2005 static void packet_seq_stop(struct seq_file *seq, void *v)
2006 __releases(seq_file_net(seq)->packet.sklist_lock)
2008 struct net *net = seq_file_net(seq);
2009 read_unlock(&net->packet.sklist_lock);
2012 static int packet_seq_show(struct seq_file *seq, void *v)
2014 if (v == SEQ_START_TOKEN)
2015 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2018 const struct packet_sock *po = pkt_sk(s);
2021 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2023 atomic_read(&s->sk_refcnt),
2028 atomic_read(&s->sk_rmem_alloc),
2036 static const struct seq_operations packet_seq_ops = {
2037 .start = packet_seq_start,
2038 .next = packet_seq_next,
2039 .stop = packet_seq_stop,
2040 .show = packet_seq_show,
2043 static int packet_seq_open(struct inode *inode, struct file *file)
2045 return seq_open_net(inode, file, &packet_seq_ops,
2046 sizeof(struct seq_net_private));
2049 static const struct file_operations packet_seq_fops = {
2050 .owner = THIS_MODULE,
2051 .open = packet_seq_open,
2053 .llseek = seq_lseek,
2054 .release = seq_release_net,
2059 static int packet_net_init(struct net *net)
2061 rwlock_init(&net->packet.sklist_lock);
2062 INIT_HLIST_HEAD(&net->packet.sklist);
2064 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2070 static void packet_net_exit(struct net *net)
2072 proc_net_remove(net, "packet");
2075 static struct pernet_operations packet_net_ops = {
2076 .init = packet_net_init,
2077 .exit = packet_net_exit,
2081 static void __exit packet_exit(void)
2083 unregister_netdevice_notifier(&packet_netdev_notifier);
2084 unregister_pernet_subsys(&packet_net_ops);
2085 sock_unregister(PF_PACKET);
2086 proto_unregister(&packet_proto);
2089 static int __init packet_init(void)
2091 int rc = proto_register(&packet_proto, 0);
2096 sock_register(&packet_family_ops);
2097 register_pernet_subsys(&packet_net_ops);
2098 register_netdevice_notifier(&packet_netdev_notifier);
2103 module_init(packet_init);
2104 module_exit(packet_exit);
2105 MODULE_LICENSE("GPL");
2106 MODULE_ALIAS_NETPROTO(PF_PACKET);