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51#include <linux/types.h>
52#include <linux/mm.h>
53#include <linux/capability.h>
54#include <linux/fcntl.h>
55#include <linux/socket.h>
56#include <linux/in.h>
57#include <linux/inet.h>
58#include <linux/netdevice.h>
59#include <linux/if_packet.h>
60#include <linux/wireless.h>
61#include <linux/kernel.h>
62#include <linux/kmod.h>
63#include <net/net_namespace.h>
64#include <net/ip.h>
65#include <net/protocol.h>
66#include <linux/skbuff.h>
67#include <net/sock.h>
68#include <linux/errno.h>
69#include <linux/timer.h>
70#include <asm/system.h>
71#include <asm/uaccess.h>
72#include <asm/ioctls.h>
73#include <asm/page.h>
74#include <asm/cacheflush.h>
75#include <asm/io.h>
76#include <linux/proc_fs.h>
77#include <linux/seq_file.h>
78#include <linux/poll.h>
79#include <linux/module.h>
80#include <linux/init.h>
81#include <linux/mutex.h>
82
83#ifdef CONFIG_INET
84#include <net/inet_common.h>
85#endif
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139
140struct packet_mclist {
141 struct packet_mclist *next;
142 int ifindex;
143 int count;
144 unsigned short type;
145 unsigned short alen;
146 unsigned char addr[MAX_ADDR_LEN];
147};
148
149
150
151struct packet_mreq_max {
152 int mr_ifindex;
153 unsigned short mr_type;
154 unsigned short mr_alen;
155 unsigned char mr_address[MAX_ADDR_LEN];
156};
157
158#ifdef CONFIG_PACKET_MMAP
159static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
160 int closing, int tx_ring);
161
162struct packet_ring_buffer {
163 char **pg_vec;
164 unsigned int head;
165 unsigned int frames_per_block;
166 unsigned int frame_size;
167 unsigned int frame_max;
168
169 unsigned int pg_vec_order;
170 unsigned int pg_vec_pages;
171 unsigned int pg_vec_len;
172
173 atomic_t pending;
174};
175
176struct packet_sock;
177static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
178#endif
179
180static void packet_flush_mclist(struct sock *sk);
181
182struct packet_sock {
183
184 struct sock sk;
185 struct tpacket_stats stats;
186#ifdef CONFIG_PACKET_MMAP
187 struct packet_ring_buffer rx_ring;
188 struct packet_ring_buffer tx_ring;
189 int copy_thresh;
190#endif
191 struct packet_type prot_hook;
192 spinlock_t bind_lock;
193 struct mutex pg_vec_lock;
194 unsigned int running:1,
195 auxdata:1,
196 origdev:1;
197 int ifindex;
198 __be16 num;
199 struct packet_mclist *mclist;
200#ifdef CONFIG_PACKET_MMAP
201 atomic_t mapped;
202 enum tpacket_versions tp_version;
203 unsigned int tp_hdrlen;
204 unsigned int tp_reserve;
205 unsigned int tp_loss:1;
206#endif
207};
208
209struct packet_skb_cb {
210 unsigned int origlen;
211 union {
212 struct sockaddr_pkt pkt;
213 struct sockaddr_ll ll;
214 } sa;
215};
216
217#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
218
219#ifdef CONFIG_PACKET_MMAP
220
221static void __packet_set_status(struct packet_sock *po, void *frame, int status)
222{
223 union {
224 struct tpacket_hdr *h1;
225 struct tpacket2_hdr *h2;
226 void *raw;
227 } h;
228
229 h.raw = frame;
230 switch (po->tp_version) {
231 case TPACKET_V1:
232 h.h1->tp_status = status;
233 flush_dcache_page(virt_to_page(&h.h1->tp_status));
234 break;
235 case TPACKET_V2:
236 h.h2->tp_status = status;
237 flush_dcache_page(virt_to_page(&h.h2->tp_status));
238 break;
239 default:
240 pr_err("TPACKET version not supported\n");
241 BUG();
242 }
243
244 smp_wmb();
245}
246
247static int __packet_get_status(struct packet_sock *po, void *frame)
248{
249 union {
250 struct tpacket_hdr *h1;
251 struct tpacket2_hdr *h2;
252 void *raw;
253 } h;
254
255 smp_rmb();
256
257 h.raw = frame;
258 switch (po->tp_version) {
259 case TPACKET_V1:
260 flush_dcache_page(virt_to_page(&h.h1->tp_status));
261 return h.h1->tp_status;
262 case TPACKET_V2:
263 flush_dcache_page(virt_to_page(&h.h2->tp_status));
264 return h.h2->tp_status;
265 default:
266 pr_err("TPACKET version not supported\n");
267 BUG();
268 return 0;
269 }
270}
271
272static void *packet_lookup_frame(struct packet_sock *po,
273 struct packet_ring_buffer *rb,
274 unsigned int position,
275 int status)
276{
277 unsigned int pg_vec_pos, frame_offset;
278 union {
279 struct tpacket_hdr *h1;
280 struct tpacket2_hdr *h2;
281 void *raw;
282 } h;
283
284 pg_vec_pos = position / rb->frames_per_block;
285 frame_offset = position % rb->frames_per_block;
286
287 h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size);
288
289 if (status != __packet_get_status(po, h.raw))
290 return NULL;
291
292 return h.raw;
293}
294
295static inline void *packet_current_frame(struct packet_sock *po,
296 struct packet_ring_buffer *rb,
297 int status)
298{
299 return packet_lookup_frame(po, rb, rb->head, status);
300}
301
302static inline void *packet_previous_frame(struct packet_sock *po,
303 struct packet_ring_buffer *rb,
304 int status)
305{
306 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
307 return packet_lookup_frame(po, rb, previous, status);
308}
309
310static inline void packet_increment_head(struct packet_ring_buffer *buff)
311{
312 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
313}
314
315#endif
316
317static inline struct packet_sock *pkt_sk(struct sock *sk)
318{
319 return (struct packet_sock *)sk;
320}
321
322static void packet_sock_destruct(struct sock *sk)
323{
324 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
325 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
326
327 if (!sock_flag(sk, SOCK_DEAD)) {
328 pr_err("Attempt to release alive packet socket: %p\n", sk);
329 return;
330 }
331
332 sk_refcnt_debug_dec(sk);
333}
334
335
336static const struct proto_ops packet_ops;
337
338static const struct proto_ops packet_ops_spkt;
339
340static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
341 struct packet_type *pt, struct net_device *orig_dev)
342{
343 struct sock *sk;
344 struct sockaddr_pkt *spkt;
345
346
347
348
349
350
351 sk = pt->af_packet_priv;
352
353
354
355
356
357
358
359
360
361
362
363
364 if (skb->pkt_type == PACKET_LOOPBACK)
365 goto out;
366
367 if (dev_net(dev) != sock_net(sk))
368 goto out;
369
370 skb = skb_share_check(skb, GFP_ATOMIC);
371 if (skb == NULL)
372 goto oom;
373
374
375 skb_dst_drop(skb);
376
377
378 nf_reset(skb);
379
380 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
381
382 skb_push(skb, skb->data - skb_mac_header(skb));
383
384
385
386
387
388 spkt->spkt_family = dev->type;
389 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
390 spkt->spkt_protocol = skb->protocol;
391
392
393
394
395
396
397 if (sock_queue_rcv_skb(sk, skb) == 0)
398 return 0;
399
400out:
401 kfree_skb(skb);
402oom:
403 return 0;
404}
405
406
407
408
409
410
411
412static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
413 struct msghdr *msg, size_t len)
414{
415 struct sock *sk = sock->sk;
416 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
417 struct sk_buff *skb;
418 struct net_device *dev;
419 __be16 proto = 0;
420 int err;
421
422
423
424
425
426 if (saddr) {
427 if (msg->msg_namelen < sizeof(struct sockaddr))
428 return -EINVAL;
429 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
430 proto = saddr->spkt_protocol;
431 } else
432 return -ENOTCONN;
433
434
435
436
437
438 saddr->spkt_device[13] = 0;
439 dev = dev_get_by_name(sock_net(sk), saddr->spkt_device);
440 err = -ENODEV;
441 if (dev == NULL)
442 goto out_unlock;
443
444 err = -ENETDOWN;
445 if (!(dev->flags & IFF_UP))
446 goto out_unlock;
447
448
449
450
451
452
453 err = -EMSGSIZE;
454 if (len > dev->mtu + dev->hard_header_len)
455 goto out_unlock;
456
457 err = -ENOBUFS;
458 skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);
459
460
461
462
463
464
465
466 if (skb == NULL)
467 goto out_unlock;
468
469
470
471
472
473
474
475
476
477 skb_reserve(skb, LL_RESERVED_SPACE(dev));
478 skb_reset_network_header(skb);
479
480
481 if (dev->header_ops) {
482 skb->data -= dev->hard_header_len;
483 skb->tail -= dev->hard_header_len;
484 if (len < dev->hard_header_len)
485 skb_reset_network_header(skb);
486 }
487
488
489 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
490 skb->protocol = proto;
491 skb->dev = dev;
492 skb->priority = sk->sk_priority;
493 if (err)
494 goto out_free;
495
496
497
498
499
500 dev_queue_xmit(skb);
501 dev_put(dev);
502 return len;
503
504out_free:
505 kfree_skb(skb);
506out_unlock:
507 if (dev)
508 dev_put(dev);
509 return err;
510}
511
512static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
513 unsigned int res)
514{
515 struct sk_filter *filter;
516
517 rcu_read_lock_bh();
518 filter = rcu_dereference(sk->sk_filter);
519 if (filter != NULL)
520 res = sk_run_filter(skb, filter->insns, filter->len);
521 rcu_read_unlock_bh();
522
523 return res;
524}
525
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530
531
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533
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535
536
537
538static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
539 struct packet_type *pt, struct net_device *orig_dev)
540{
541 struct sock *sk;
542 struct sockaddr_ll *sll;
543 struct packet_sock *po;
544 u8 *skb_head = skb->data;
545 int skb_len = skb->len;
546 unsigned int snaplen, res;
547
548 if (skb->pkt_type == PACKET_LOOPBACK)
549 goto drop;
550
551 sk = pt->af_packet_priv;
552 po = pkt_sk(sk);
553
554 if (dev_net(dev) != sock_net(sk))
555 goto drop;
556
557 skb->dev = dev;
558
559 if (dev->header_ops) {
560
561
562
563
564
565
566
567 if (sk->sk_type != SOCK_DGRAM)
568 skb_push(skb, skb->data - skb_mac_header(skb));
569 else if (skb->pkt_type == PACKET_OUTGOING) {
570
571 skb_pull(skb, skb_network_offset(skb));
572 }
573 }
574
575 snaplen = skb->len;
576
577 res = run_filter(skb, sk, snaplen);
578 if (!res)
579 goto drop_n_restore;
580 if (snaplen > res)
581 snaplen = res;
582
583 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
584 (unsigned)sk->sk_rcvbuf)
585 goto drop_n_acct;
586
587 if (skb_shared(skb)) {
588 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
589 if (nskb == NULL)
590 goto drop_n_acct;
591
592 if (skb_head != skb->data) {
593 skb->data = skb_head;
594 skb->len = skb_len;
595 }
596 kfree_skb(skb);
597 skb = nskb;
598 }
599
600 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
601 sizeof(skb->cb));
602
603 sll = &PACKET_SKB_CB(skb)->sa.ll;
604 sll->sll_family = AF_PACKET;
605 sll->sll_hatype = dev->type;
606 sll->sll_protocol = skb->protocol;
607 sll->sll_pkttype = skb->pkt_type;
608 if (unlikely(po->origdev))
609 sll->sll_ifindex = orig_dev->ifindex;
610 else
611 sll->sll_ifindex = dev->ifindex;
612
613 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
614
615 PACKET_SKB_CB(skb)->origlen = skb->len;
616
617 if (pskb_trim(skb, snaplen))
618 goto drop_n_acct;
619
620 skb_set_owner_r(skb, sk);
621 skb->dev = NULL;
622 skb_dst_drop(skb);
623
624
625 nf_reset(skb);
626
627 spin_lock(&sk->sk_receive_queue.lock);
628 po->stats.tp_packets++;
629 __skb_queue_tail(&sk->sk_receive_queue, skb);
630 spin_unlock(&sk->sk_receive_queue.lock);
631 sk->sk_data_ready(sk, skb->len);
632 return 0;
633
634drop_n_acct:
635 spin_lock(&sk->sk_receive_queue.lock);
636 po->stats.tp_drops++;
637 spin_unlock(&sk->sk_receive_queue.lock);
638
639drop_n_restore:
640 if (skb_head != skb->data && skb_shared(skb)) {
641 skb->data = skb_head;
642 skb->len = skb_len;
643 }
644drop:
645 consume_skb(skb);
646 return 0;
647}
648
649#ifdef CONFIG_PACKET_MMAP
650static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
651 struct packet_type *pt, struct net_device *orig_dev)
652{
653 struct sock *sk;
654 struct packet_sock *po;
655 struct sockaddr_ll *sll;
656 union {
657 struct tpacket_hdr *h1;
658 struct tpacket2_hdr *h2;
659 void *raw;
660 } h;
661 u8 *skb_head = skb->data;
662 int skb_len = skb->len;
663 unsigned int snaplen, res;
664 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
665 unsigned short macoff, netoff, hdrlen;
666 struct sk_buff *copy_skb = NULL;
667 struct timeval tv;
668 struct timespec ts;
669
670 if (skb->pkt_type == PACKET_LOOPBACK)
671 goto drop;
672
673 sk = pt->af_packet_priv;
674 po = pkt_sk(sk);
675
676 if (dev_net(dev) != sock_net(sk))
677 goto drop;
678
679 if (dev->header_ops) {
680 if (sk->sk_type != SOCK_DGRAM)
681 skb_push(skb, skb->data - skb_mac_header(skb));
682 else if (skb->pkt_type == PACKET_OUTGOING) {
683
684 skb_pull(skb, skb_network_offset(skb));
685 }
686 }
687
688 if (skb->ip_summed == CHECKSUM_PARTIAL)
689 status |= TP_STATUS_CSUMNOTREADY;
690
691 snaplen = skb->len;
692
693 res = run_filter(skb, sk, snaplen);
694 if (!res)
695 goto drop_n_restore;
696 if (snaplen > res)
697 snaplen = res;
698
699 if (sk->sk_type == SOCK_DGRAM) {
700 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
701 po->tp_reserve;
702 } else {
703 unsigned maclen = skb_network_offset(skb);
704 netoff = TPACKET_ALIGN(po->tp_hdrlen +
705 (maclen < 16 ? 16 : maclen)) +
706 po->tp_reserve;
707 macoff = netoff - maclen;
708 }
709
710 if (macoff + snaplen > po->rx_ring.frame_size) {
711 if (po->copy_thresh &&
712 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
713 (unsigned)sk->sk_rcvbuf) {
714 if (skb_shared(skb)) {
715 copy_skb = skb_clone(skb, GFP_ATOMIC);
716 } else {
717 copy_skb = skb_get(skb);
718 skb_head = skb->data;
719 }
720 if (copy_skb)
721 skb_set_owner_r(copy_skb, sk);
722 }
723 snaplen = po->rx_ring.frame_size - macoff;
724 if ((int)snaplen < 0)
725 snaplen = 0;
726 }
727
728 spin_lock(&sk->sk_receive_queue.lock);
729 h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
730 if (!h.raw)
731 goto ring_is_full;
732 packet_increment_head(&po->rx_ring);
733 po->stats.tp_packets++;
734 if (copy_skb) {
735 status |= TP_STATUS_COPY;
736 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
737 }
738 if (!po->stats.tp_drops)
739 status &= ~TP_STATUS_LOSING;
740 spin_unlock(&sk->sk_receive_queue.lock);
741
742 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
743
744 switch (po->tp_version) {
745 case TPACKET_V1:
746 h.h1->tp_len = skb->len;
747 h.h1->tp_snaplen = snaplen;
748 h.h1->tp_mac = macoff;
749 h.h1->tp_net = netoff;
750 if (skb->tstamp.tv64)
751 tv = ktime_to_timeval(skb->tstamp);
752 else
753 do_gettimeofday(&tv);
754 h.h1->tp_sec = tv.tv_sec;
755 h.h1->tp_usec = tv.tv_usec;
756 hdrlen = sizeof(*h.h1);
757 break;
758 case TPACKET_V2:
759 h.h2->tp_len = skb->len;
760 h.h2->tp_snaplen = snaplen;
761 h.h2->tp_mac = macoff;
762 h.h2->tp_net = netoff;
763 if (skb->tstamp.tv64)
764 ts = ktime_to_timespec(skb->tstamp);
765 else
766 getnstimeofday(&ts);
767 h.h2->tp_sec = ts.tv_sec;
768 h.h2->tp_nsec = ts.tv_nsec;
769 h.h2->tp_vlan_tci = skb->vlan_tci;
770 hdrlen = sizeof(*h.h2);
771 break;
772 default:
773 BUG();
774 }
775
776 sll = h.raw + TPACKET_ALIGN(hdrlen);
777 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
778 sll->sll_family = AF_PACKET;
779 sll->sll_hatype = dev->type;
780 sll->sll_protocol = skb->protocol;
781 sll->sll_pkttype = skb->pkt_type;
782 if (unlikely(po->origdev))
783 sll->sll_ifindex = orig_dev->ifindex;
784 else
785 sll->sll_ifindex = dev->ifindex;
786
787 __packet_set_status(po, h.raw, status);
788 smp_mb();
789 {
790 struct page *p_start, *p_end;
791 u8 *h_end = h.raw + macoff + snaplen - 1;
792
793 p_start = virt_to_page(h.raw);
794 p_end = virt_to_page(h_end);
795 while (p_start <= p_end) {
796 flush_dcache_page(p_start);
797 p_start++;
798 }
799 }
800
801 sk->sk_data_ready(sk, 0);
802
803drop_n_restore:
804 if (skb_head != skb->data && skb_shared(skb)) {
805 skb->data = skb_head;
806 skb->len = skb_len;
807 }
808drop:
809 kfree_skb(skb);
810 return 0;
811
812ring_is_full:
813 po->stats.tp_drops++;
814 spin_unlock(&sk->sk_receive_queue.lock);
815
816 sk->sk_data_ready(sk, 0);
817 kfree_skb(copy_skb);
818 goto drop_n_restore;
819}
820
821static void tpacket_destruct_skb(struct sk_buff *skb)
822{
823 struct packet_sock *po = pkt_sk(skb->sk);
824 void *ph;
825
826 BUG_ON(skb == NULL);
827
828 if (likely(po->tx_ring.pg_vec)) {
829 ph = skb_shinfo(skb)->destructor_arg;
830 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
831 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
832 atomic_dec(&po->tx_ring.pending);
833 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
834 }
835
836 sock_wfree(skb);
837}
838
839static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
840 void *frame, struct net_device *dev, int size_max,
841 __be16 proto, unsigned char *addr)
842{
843 union {
844 struct tpacket_hdr *h1;
845 struct tpacket2_hdr *h2;
846 void *raw;
847 } ph;
848 int to_write, offset, len, tp_len, nr_frags, len_max;
849 struct socket *sock = po->sk.sk_socket;
850 struct page *page;
851 void *data;
852 int err;
853
854 ph.raw = frame;
855
856 skb->protocol = proto;
857 skb->dev = dev;
858 skb->priority = po->sk.sk_priority;
859 skb_shinfo(skb)->destructor_arg = ph.raw;
860
861 switch (po->tp_version) {
862 case TPACKET_V2:
863 tp_len = ph.h2->tp_len;
864 break;
865 default:
866 tp_len = ph.h1->tp_len;
867 break;
868 }
869 if (unlikely(tp_len > size_max)) {
870 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
871 return -EMSGSIZE;
872 }
873
874 skb_reserve(skb, LL_RESERVED_SPACE(dev));
875 skb_reset_network_header(skb);
876
877 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
878 to_write = tp_len;
879
880 if (sock->type == SOCK_DGRAM) {
881 err = dev_hard_header(skb, dev, ntohs(proto), addr,
882 NULL, tp_len);
883 if (unlikely(err < 0))
884 return -EINVAL;
885 } else if (dev->hard_header_len) {
886
887 if (unlikely(tp_len <= dev->hard_header_len)) {
888 pr_err("packet size is too short (%d < %d)\n",
889 tp_len, dev->hard_header_len);
890 return -EINVAL;
891 }
892
893 skb_push(skb, dev->hard_header_len);
894 err = skb_store_bits(skb, 0, data,
895 dev->hard_header_len);
896 if (unlikely(err))
897 return err;
898
899 data += dev->hard_header_len;
900 to_write -= dev->hard_header_len;
901 }
902
903 err = -EFAULT;
904 page = virt_to_page(data);
905 offset = offset_in_page(data);
906 len_max = PAGE_SIZE - offset;
907 len = ((to_write > len_max) ? len_max : to_write);
908
909 skb->data_len = to_write;
910 skb->len += to_write;
911 skb->truesize += to_write;
912 atomic_add(to_write, &po->sk.sk_wmem_alloc);
913
914 while (likely(to_write)) {
915 nr_frags = skb_shinfo(skb)->nr_frags;
916
917 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
918 pr_err("Packet exceed the number of skb frags(%lu)\n",
919 MAX_SKB_FRAGS);
920 return -EFAULT;
921 }
922
923 flush_dcache_page(page);
924 get_page(page);
925 skb_fill_page_desc(skb,
926 nr_frags,
927 page++, offset, len);
928 to_write -= len;
929 offset = 0;
930 len_max = PAGE_SIZE;
931 len = ((to_write > len_max) ? len_max : to_write);
932 }
933
934 return tp_len;
935}
936
937static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
938{
939 struct socket *sock;
940 struct sk_buff *skb;
941 struct net_device *dev;
942 __be16 proto;
943 int ifindex, err, reserve = 0;
944 void *ph;
945 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
946 int tp_len, size_max;
947 unsigned char *addr;
948 int len_sum = 0;
949 int status = 0;
950
951 sock = po->sk.sk_socket;
952
953 mutex_lock(&po->pg_vec_lock);
954
955 err = -EBUSY;
956 if (saddr == NULL) {
957 ifindex = po->ifindex;
958 proto = po->num;
959 addr = NULL;
960 } else {
961 err = -EINVAL;
962 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
963 goto out;
964 if (msg->msg_namelen < (saddr->sll_halen
965 + offsetof(struct sockaddr_ll,
966 sll_addr)))
967 goto out;
968 ifindex = saddr->sll_ifindex;
969 proto = saddr->sll_protocol;
970 addr = saddr->sll_addr;
971 }
972
973 dev = dev_get_by_index(sock_net(&po->sk), ifindex);
974 err = -ENXIO;
975 if (unlikely(dev == NULL))
976 goto out;
977
978 reserve = dev->hard_header_len;
979
980 err = -ENETDOWN;
981 if (unlikely(!(dev->flags & IFF_UP)))
982 goto out_put;
983
984 size_max = po->tx_ring.frame_size
985 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
986
987 if (size_max > dev->mtu + reserve)
988 size_max = dev->mtu + reserve;
989
990 do {
991 ph = packet_current_frame(po, &po->tx_ring,
992 TP_STATUS_SEND_REQUEST);
993
994 if (unlikely(ph == NULL)) {
995 schedule();
996 continue;
997 }
998
999 status = TP_STATUS_SEND_REQUEST;
1000 skb = sock_alloc_send_skb(&po->sk,
1001 LL_ALLOCATED_SPACE(dev)
1002 + sizeof(struct sockaddr_ll),
1003 0, &err);
1004
1005 if (unlikely(skb == NULL))
1006 goto out_status;
1007
1008 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1009 addr);
1010
1011 if (unlikely(tp_len < 0)) {
1012 if (po->tp_loss) {
1013 __packet_set_status(po, ph,
1014 TP_STATUS_AVAILABLE);
1015 packet_increment_head(&po->tx_ring);
1016 kfree_skb(skb);
1017 continue;
1018 } else {
1019 status = TP_STATUS_WRONG_FORMAT;
1020 err = tp_len;
1021 goto out_status;
1022 }
1023 }
1024
1025 skb->destructor = tpacket_destruct_skb;
1026 __packet_set_status(po, ph, TP_STATUS_SENDING);
1027 atomic_inc(&po->tx_ring.pending);
1028
1029 status = TP_STATUS_SEND_REQUEST;
1030 err = dev_queue_xmit(skb);
1031 if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0))
1032 goto out_xmit;
1033 packet_increment_head(&po->tx_ring);
1034 len_sum += tp_len;
1035 } while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT))
1036 && (atomic_read(&po->tx_ring.pending))))
1037 );
1038
1039 err = len_sum;
1040 goto out_put;
1041
1042out_xmit:
1043 skb->destructor = sock_wfree;
1044 atomic_dec(&po->tx_ring.pending);
1045out_status:
1046 __packet_set_status(po, ph, status);
1047 kfree_skb(skb);
1048out_put:
1049 dev_put(dev);
1050out:
1051 mutex_unlock(&po->pg_vec_lock);
1052 return err;
1053}
1054#endif
1055
1056static int packet_snd(struct socket *sock,
1057 struct msghdr *msg, size_t len)
1058{
1059 struct sock *sk = sock->sk;
1060 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1061 struct sk_buff *skb;
1062 struct net_device *dev;
1063 __be16 proto;
1064 unsigned char *addr;
1065 int ifindex, err, reserve = 0;
1066
1067
1068
1069
1070
1071 if (saddr == NULL) {
1072 struct packet_sock *po = pkt_sk(sk);
1073
1074 ifindex = po->ifindex;
1075 proto = po->num;
1076 addr = NULL;
1077 } else {
1078 err = -EINVAL;
1079 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1080 goto out;
1081 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1082 goto out;
1083 ifindex = saddr->sll_ifindex;
1084 proto = saddr->sll_protocol;
1085 addr = saddr->sll_addr;
1086 }
1087
1088
1089 dev = dev_get_by_index(sock_net(sk), ifindex);
1090 err = -ENXIO;
1091 if (dev == NULL)
1092 goto out_unlock;
1093 if (sock->type == SOCK_RAW)
1094 reserve = dev->hard_header_len;
1095
1096 err = -ENETDOWN;
1097 if (!(dev->flags & IFF_UP))
1098 goto out_unlock;
1099
1100 err = -EMSGSIZE;
1101 if (len > dev->mtu+reserve)
1102 goto out_unlock;
1103
1104 skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
1105 msg->msg_flags & MSG_DONTWAIT, &err);
1106 if (skb == NULL)
1107 goto out_unlock;
1108
1109 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1110 skb_reset_network_header(skb);
1111
1112 err = -EINVAL;
1113 if (sock->type == SOCK_DGRAM &&
1114 dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
1115 goto out_free;
1116
1117
1118 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1119 if (err)
1120 goto out_free;
1121
1122 skb->protocol = proto;
1123 skb->dev = dev;
1124 skb->priority = sk->sk_priority;
1125
1126
1127
1128
1129
1130 err = dev_queue_xmit(skb);
1131 if (err > 0 && (err = net_xmit_errno(err)) != 0)
1132 goto out_unlock;
1133
1134 dev_put(dev);
1135
1136 return len;
1137
1138out_free:
1139 kfree_skb(skb);
1140out_unlock:
1141 if (dev)
1142 dev_put(dev);
1143out:
1144 return err;
1145}
1146
1147static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1148 struct msghdr *msg, size_t len)
1149{
1150#ifdef CONFIG_PACKET_MMAP
1151 struct sock *sk = sock->sk;
1152 struct packet_sock *po = pkt_sk(sk);
1153 if (po->tx_ring.pg_vec)
1154 return tpacket_snd(po, msg);
1155 else
1156#endif
1157 return packet_snd(sock, msg, len);
1158}
1159
1160
1161
1162
1163
1164
1165static int packet_release(struct socket *sock)
1166{
1167 struct sock *sk = sock->sk;
1168 struct packet_sock *po;
1169 struct net *net;
1170#ifdef CONFIG_PACKET_MMAP
1171 struct tpacket_req req;
1172#endif
1173
1174 if (!sk)
1175 return 0;
1176
1177 net = sock_net(sk);
1178 po = pkt_sk(sk);
1179
1180 write_lock_bh(&net->packet.sklist_lock);
1181 sk_del_node_init(sk);
1182 sock_prot_inuse_add(net, sk->sk_prot, -1);
1183 write_unlock_bh(&net->packet.sklist_lock);
1184
1185
1186
1187
1188
1189 if (po->running) {
1190
1191
1192
1193 dev_remove_pack(&po->prot_hook);
1194 po->running = 0;
1195 po->num = 0;
1196 __sock_put(sk);
1197 }
1198
1199 packet_flush_mclist(sk);
1200
1201#ifdef CONFIG_PACKET_MMAP
1202 memset(&req, 0, sizeof(req));
1203
1204 if (po->rx_ring.pg_vec)
1205 packet_set_ring(sk, &req, 1, 0);
1206
1207 if (po->tx_ring.pg_vec)
1208 packet_set_ring(sk, &req, 1, 1);
1209#endif
1210
1211
1212
1213
1214
1215 sock_orphan(sk);
1216 sock->sk = NULL;
1217
1218
1219
1220 skb_queue_purge(&sk->sk_receive_queue);
1221 sk_refcnt_debug_release(sk);
1222
1223 sock_put(sk);
1224 return 0;
1225}
1226
1227
1228
1229
1230
1231static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1232{
1233 struct packet_sock *po = pkt_sk(sk);
1234
1235
1236
1237
1238 lock_sock(sk);
1239
1240 spin_lock(&po->bind_lock);
1241 if (po->running) {
1242 __sock_put(sk);
1243 po->running = 0;
1244 po->num = 0;
1245 spin_unlock(&po->bind_lock);
1246 dev_remove_pack(&po->prot_hook);
1247 spin_lock(&po->bind_lock);
1248 }
1249
1250 po->num = protocol;
1251 po->prot_hook.type = protocol;
1252 po->prot_hook.dev = dev;
1253
1254 po->ifindex = dev ? dev->ifindex : 0;
1255
1256 if (protocol == 0)
1257 goto out_unlock;
1258
1259 if (!dev || (dev->flags & IFF_UP)) {
1260 dev_add_pack(&po->prot_hook);
1261 sock_hold(sk);
1262 po->running = 1;
1263 } else {
1264 sk->sk_err = ENETDOWN;
1265 if (!sock_flag(sk, SOCK_DEAD))
1266 sk->sk_error_report(sk);
1267 }
1268
1269out_unlock:
1270 spin_unlock(&po->bind_lock);
1271 release_sock(sk);
1272 return 0;
1273}
1274
1275
1276
1277
1278
1279static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
1280 int addr_len)
1281{
1282 struct sock *sk = sock->sk;
1283 char name[15];
1284 struct net_device *dev;
1285 int err = -ENODEV;
1286
1287
1288
1289
1290
1291 if (addr_len != sizeof(struct sockaddr))
1292 return -EINVAL;
1293 strlcpy(name, uaddr->sa_data, sizeof(name));
1294
1295 dev = dev_get_by_name(sock_net(sk), name);
1296 if (dev) {
1297 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1298 dev_put(dev);
1299 }
1300 return err;
1301}
1302
1303static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1304{
1305 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1306 struct sock *sk = sock->sk;
1307 struct net_device *dev = NULL;
1308 int err;
1309
1310
1311
1312
1313
1314
1315 if (addr_len < sizeof(struct sockaddr_ll))
1316 return -EINVAL;
1317 if (sll->sll_family != AF_PACKET)
1318 return -EINVAL;
1319
1320 if (sll->sll_ifindex) {
1321 err = -ENODEV;
1322 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1323 if (dev == NULL)
1324 goto out;
1325 }
1326 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1327 if (dev)
1328 dev_put(dev);
1329
1330out:
1331 return err;
1332}
1333
1334static struct proto packet_proto = {
1335 .name = "PACKET",
1336 .owner = THIS_MODULE,
1337 .obj_size = sizeof(struct packet_sock),
1338};
1339
1340
1341
1342
1343
1344static int packet_create(struct net *net, struct socket *sock, int protocol)
1345{
1346 struct sock *sk;
1347 struct packet_sock *po;
1348 __be16 proto = (__force __be16)protocol;
1349 int err;
1350
1351 if (!capable(CAP_NET_RAW))
1352 return -EPERM;
1353 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1354 sock->type != SOCK_PACKET)
1355 return -ESOCKTNOSUPPORT;
1356
1357 sock->state = SS_UNCONNECTED;
1358
1359 err = -ENOBUFS;
1360 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1361 if (sk == NULL)
1362 goto out;
1363
1364 sock->ops = &packet_ops;
1365 if (sock->type == SOCK_PACKET)
1366 sock->ops = &packet_ops_spkt;
1367
1368 sock_init_data(sock, sk);
1369
1370 po = pkt_sk(sk);
1371 sk->sk_family = PF_PACKET;
1372 po->num = proto;
1373
1374 sk->sk_destruct = packet_sock_destruct;
1375 sk_refcnt_debug_inc(sk);
1376
1377
1378
1379
1380
1381 spin_lock_init(&po->bind_lock);
1382 mutex_init(&po->pg_vec_lock);
1383 po->prot_hook.func = packet_rcv;
1384
1385 if (sock->type == SOCK_PACKET)
1386 po->prot_hook.func = packet_rcv_spkt;
1387
1388 po->prot_hook.af_packet_priv = sk;
1389
1390 if (proto) {
1391 po->prot_hook.type = proto;
1392 dev_add_pack(&po->prot_hook);
1393 sock_hold(sk);
1394 po->running = 1;
1395 }
1396
1397 write_lock_bh(&net->packet.sklist_lock);
1398 sk_add_node(sk, &net->packet.sklist);
1399 sock_prot_inuse_add(net, &packet_proto, 1);
1400 write_unlock_bh(&net->packet.sklist_lock);
1401 return 0;
1402out:
1403 return err;
1404}
1405
1406
1407
1408
1409
1410
1411static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1412 struct msghdr *msg, size_t len, int flags)
1413{
1414 struct sock *sk = sock->sk;
1415 struct sk_buff *skb;
1416 int copied, err;
1417 struct sockaddr_ll *sll;
1418
1419 err = -EINVAL;
1420 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
1421 goto out;
1422
1423#if 0
1424
1425 if (pkt_sk(sk)->ifindex < 0)
1426 return -ENODEV;
1427#endif
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1439
1440
1441
1442
1443
1444
1445
1446 if (skb == NULL)
1447 goto out;
1448
1449
1450
1451
1452
1453
1454 sll = &PACKET_SKB_CB(skb)->sa.ll;
1455 if (sock->type == SOCK_PACKET)
1456 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1457 else
1458 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1459
1460
1461
1462
1463
1464
1465 copied = skb->len;
1466 if (copied > len) {
1467 copied = len;
1468 msg->msg_flags |= MSG_TRUNC;
1469 }
1470
1471 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1472 if (err)
1473 goto out_free;
1474
1475 sock_recv_timestamp(msg, sk, skb);
1476
1477 if (msg->msg_name)
1478 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1479 msg->msg_namelen);
1480
1481 if (pkt_sk(sk)->auxdata) {
1482 struct tpacket_auxdata aux;
1483
1484 aux.tp_status = TP_STATUS_USER;
1485 if (skb->ip_summed == CHECKSUM_PARTIAL)
1486 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1487 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1488 aux.tp_snaplen = skb->len;
1489 aux.tp_mac = 0;
1490 aux.tp_net = skb_network_offset(skb);
1491 aux.tp_vlan_tci = skb->vlan_tci;
1492
1493 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1494 }
1495
1496
1497
1498
1499
1500 err = (flags&MSG_TRUNC) ? skb->len : copied;
1501
1502out_free:
1503 skb_free_datagram(sk, skb);
1504out:
1505 return err;
1506}
1507
1508static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1509 int *uaddr_len, int peer)
1510{
1511 struct net_device *dev;
1512 struct sock *sk = sock->sk;
1513
1514 if (peer)
1515 return -EOPNOTSUPP;
1516
1517 uaddr->sa_family = AF_PACKET;
1518 dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex);
1519 if (dev) {
1520 strlcpy(uaddr->sa_data, dev->name, 15);
1521 dev_put(dev);
1522 } else
1523 memset(uaddr->sa_data, 0, 14);
1524 *uaddr_len = sizeof(*uaddr);
1525
1526 return 0;
1527}
1528
1529static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1530 int *uaddr_len, int peer)
1531{
1532 struct net_device *dev;
1533 struct sock *sk = sock->sk;
1534 struct packet_sock *po = pkt_sk(sk);
1535 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1536
1537 if (peer)
1538 return -EOPNOTSUPP;
1539
1540 sll->sll_family = AF_PACKET;
1541 sll->sll_ifindex = po->ifindex;
1542 sll->sll_protocol = po->num;
1543 dev = dev_get_by_index(sock_net(sk), po->ifindex);
1544 if (dev) {
1545 sll->sll_hatype = dev->type;
1546 sll->sll_halen = dev->addr_len;
1547 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1548 dev_put(dev);
1549 } else {
1550 sll->sll_hatype = 0;
1551 sll->sll_halen = 0;
1552 }
1553 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1554
1555 return 0;
1556}
1557
1558static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1559 int what)
1560{
1561 switch (i->type) {
1562 case PACKET_MR_MULTICAST:
1563 if (what > 0)
1564 return dev_mc_add(dev, i->addr, i->alen, 0);
1565 else
1566 return dev_mc_delete(dev, i->addr, i->alen, 0);
1567 break;
1568 case PACKET_MR_PROMISC:
1569 return dev_set_promiscuity(dev, what);
1570 break;
1571 case PACKET_MR_ALLMULTI:
1572 return dev_set_allmulti(dev, what);
1573 break;
1574 case PACKET_MR_UNICAST:
1575 if (what > 0)
1576 return dev_unicast_add(dev, i->addr);
1577 else
1578 return dev_unicast_delete(dev, i->addr);
1579 break;
1580 default:
1581 break;
1582 }
1583 return 0;
1584}
1585
1586static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1587{
1588 for ( ; i; i = i->next) {
1589 if (i->ifindex == dev->ifindex)
1590 packet_dev_mc(dev, i, what);
1591 }
1592}
1593
1594static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1595{
1596 struct packet_sock *po = pkt_sk(sk);
1597 struct packet_mclist *ml, *i;
1598 struct net_device *dev;
1599 int err;
1600
1601 rtnl_lock();
1602
1603 err = -ENODEV;
1604 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1605 if (!dev)
1606 goto done;
1607
1608 err = -EINVAL;
1609 if (mreq->mr_alen > dev->addr_len)
1610 goto done;
1611
1612 err = -ENOBUFS;
1613 i = kmalloc(sizeof(*i), GFP_KERNEL);
1614 if (i == NULL)
1615 goto done;
1616
1617 err = 0;
1618 for (ml = po->mclist; ml; ml = ml->next) {
1619 if (ml->ifindex == mreq->mr_ifindex &&
1620 ml->type == mreq->mr_type &&
1621 ml->alen == mreq->mr_alen &&
1622 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1623 ml->count++;
1624
1625 kfree(i);
1626 goto done;
1627 }
1628 }
1629
1630 i->type = mreq->mr_type;
1631 i->ifindex = mreq->mr_ifindex;
1632 i->alen = mreq->mr_alen;
1633 memcpy(i->addr, mreq->mr_address, i->alen);
1634 i->count = 1;
1635 i->next = po->mclist;
1636 po->mclist = i;
1637 err = packet_dev_mc(dev, i, 1);
1638 if (err) {
1639 po->mclist = i->next;
1640 kfree(i);
1641 }
1642
1643done:
1644 rtnl_unlock();
1645 return err;
1646}
1647
1648static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1649{
1650 struct packet_mclist *ml, **mlp;
1651
1652 rtnl_lock();
1653
1654 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1655 if (ml->ifindex == mreq->mr_ifindex &&
1656 ml->type == mreq->mr_type &&
1657 ml->alen == mreq->mr_alen &&
1658 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1659 if (--ml->count == 0) {
1660 struct net_device *dev;
1661 *mlp = ml->next;
1662 dev = dev_get_by_index(sock_net(sk), ml->ifindex);
1663 if (dev) {
1664 packet_dev_mc(dev, ml, -1);
1665 dev_put(dev);
1666 }
1667 kfree(ml);
1668 }
1669 rtnl_unlock();
1670 return 0;
1671 }
1672 }
1673 rtnl_unlock();
1674 return -EADDRNOTAVAIL;
1675}
1676
1677static void packet_flush_mclist(struct sock *sk)
1678{
1679 struct packet_sock *po = pkt_sk(sk);
1680 struct packet_mclist *ml;
1681
1682 if (!po->mclist)
1683 return;
1684
1685 rtnl_lock();
1686 while ((ml = po->mclist) != NULL) {
1687 struct net_device *dev;
1688
1689 po->mclist = ml->next;
1690 dev = dev_get_by_index(sock_net(sk), ml->ifindex);
1691 if (dev != NULL) {
1692 packet_dev_mc(dev, ml, -1);
1693 dev_put(dev);
1694 }
1695 kfree(ml);
1696 }
1697 rtnl_unlock();
1698}
1699
1700static int
1701packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1702{
1703 struct sock *sk = sock->sk;
1704 struct packet_sock *po = pkt_sk(sk);
1705 int ret;
1706
1707 if (level != SOL_PACKET)
1708 return -ENOPROTOOPT;
1709
1710 switch (optname) {
1711 case PACKET_ADD_MEMBERSHIP:
1712 case PACKET_DROP_MEMBERSHIP:
1713 {
1714 struct packet_mreq_max mreq;
1715 int len = optlen;
1716 memset(&mreq, 0, sizeof(mreq));
1717 if (len < sizeof(struct packet_mreq))
1718 return -EINVAL;
1719 if (len > sizeof(mreq))
1720 len = sizeof(mreq);
1721 if (copy_from_user(&mreq, optval, len))
1722 return -EFAULT;
1723 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1724 return -EINVAL;
1725 if (optname == PACKET_ADD_MEMBERSHIP)
1726 ret = packet_mc_add(sk, &mreq);
1727 else
1728 ret = packet_mc_drop(sk, &mreq);
1729 return ret;
1730 }
1731
1732#ifdef CONFIG_PACKET_MMAP
1733 case PACKET_RX_RING:
1734 case PACKET_TX_RING:
1735 {
1736 struct tpacket_req req;
1737
1738 if (optlen < sizeof(req))
1739 return -EINVAL;
1740 if (copy_from_user(&req, optval, sizeof(req)))
1741 return -EFAULT;
1742 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
1743 }
1744 case PACKET_COPY_THRESH:
1745 {
1746 int val;
1747
1748 if (optlen != sizeof(val))
1749 return -EINVAL;
1750 if (copy_from_user(&val, optval, sizeof(val)))
1751 return -EFAULT;
1752
1753 pkt_sk(sk)->copy_thresh = val;
1754 return 0;
1755 }
1756 case PACKET_VERSION:
1757 {
1758 int val;
1759
1760 if (optlen != sizeof(val))
1761 return -EINVAL;
1762 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1763 return -EBUSY;
1764 if (copy_from_user(&val, optval, sizeof(val)))
1765 return -EFAULT;
1766 switch (val) {
1767 case TPACKET_V1:
1768 case TPACKET_V2:
1769 po->tp_version = val;
1770 return 0;
1771 default:
1772 return -EINVAL;
1773 }
1774 }
1775 case PACKET_RESERVE:
1776 {
1777 unsigned int val;
1778
1779 if (optlen != sizeof(val))
1780 return -EINVAL;
1781 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1782 return -EBUSY;
1783 if (copy_from_user(&val, optval, sizeof(val)))
1784 return -EFAULT;
1785 po->tp_reserve = val;
1786 return 0;
1787 }
1788 case PACKET_LOSS:
1789 {
1790 unsigned int val;
1791
1792 if (optlen != sizeof(val))
1793 return -EINVAL;
1794 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1795 return -EBUSY;
1796 if (copy_from_user(&val, optval, sizeof(val)))
1797 return -EFAULT;
1798 po->tp_loss = !!val;
1799 return 0;
1800 }
1801#endif
1802 case PACKET_AUXDATA:
1803 {
1804 int val;
1805
1806 if (optlen < sizeof(val))
1807 return -EINVAL;
1808 if (copy_from_user(&val, optval, sizeof(val)))
1809 return -EFAULT;
1810
1811 po->auxdata = !!val;
1812 return 0;
1813 }
1814 case PACKET_ORIGDEV:
1815 {
1816 int val;
1817
1818 if (optlen < sizeof(val))
1819 return -EINVAL;
1820 if (copy_from_user(&val, optval, sizeof(val)))
1821 return -EFAULT;
1822
1823 po->origdev = !!val;
1824 return 0;
1825 }
1826 default:
1827 return -ENOPROTOOPT;
1828 }
1829}
1830
1831static int packet_getsockopt(struct socket *sock, int level, int optname,
1832 char __user *optval, int __user *optlen)
1833{
1834 int len;
1835 int val;
1836 struct sock *sk = sock->sk;
1837 struct packet_sock *po = pkt_sk(sk);
1838 void *data;
1839 struct tpacket_stats st;
1840
1841 if (level != SOL_PACKET)
1842 return -ENOPROTOOPT;
1843
1844 if (get_user(len, optlen))
1845 return -EFAULT;
1846
1847 if (len < 0)
1848 return -EINVAL;
1849
1850 switch (optname) {
1851 case PACKET_STATISTICS:
1852 if (len > sizeof(struct tpacket_stats))
1853 len = sizeof(struct tpacket_stats);
1854 spin_lock_bh(&sk->sk_receive_queue.lock);
1855 st = po->stats;
1856 memset(&po->stats, 0, sizeof(st));
1857 spin_unlock_bh(&sk->sk_receive_queue.lock);
1858 st.tp_packets += st.tp_drops;
1859
1860 data = &st;
1861 break;
1862 case PACKET_AUXDATA:
1863 if (len > sizeof(int))
1864 len = sizeof(int);
1865 val = po->auxdata;
1866
1867 data = &val;
1868 break;
1869 case PACKET_ORIGDEV:
1870 if (len > sizeof(int))
1871 len = sizeof(int);
1872 val = po->origdev;
1873
1874 data = &val;
1875 break;
1876#ifdef CONFIG_PACKET_MMAP
1877 case PACKET_VERSION:
1878 if (len > sizeof(int))
1879 len = sizeof(int);
1880 val = po->tp_version;
1881 data = &val;
1882 break;
1883 case PACKET_HDRLEN:
1884 if (len > sizeof(int))
1885 len = sizeof(int);
1886 if (copy_from_user(&val, optval, len))
1887 return -EFAULT;
1888 switch (val) {
1889 case TPACKET_V1:
1890 val = sizeof(struct tpacket_hdr);
1891 break;
1892 case TPACKET_V2:
1893 val = sizeof(struct tpacket2_hdr);
1894 break;
1895 default:
1896 return -EINVAL;
1897 }
1898 data = &val;
1899 break;
1900 case PACKET_RESERVE:
1901 if (len > sizeof(unsigned int))
1902 len = sizeof(unsigned int);
1903 val = po->tp_reserve;
1904 data = &val;
1905 break;
1906 case PACKET_LOSS:
1907 if (len > sizeof(unsigned int))
1908 len = sizeof(unsigned int);
1909 val = po->tp_loss;
1910 data = &val;
1911 break;
1912#endif
1913 default:
1914 return -ENOPROTOOPT;
1915 }
1916
1917 if (put_user(len, optlen))
1918 return -EFAULT;
1919 if (copy_to_user(optval, data, len))
1920 return -EFAULT;
1921 return 0;
1922}
1923
1924
1925static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
1926{
1927 struct sock *sk;
1928 struct hlist_node *node;
1929 struct net_device *dev = data;
1930 struct net *net = dev_net(dev);
1931
1932 read_lock(&net->packet.sklist_lock);
1933 sk_for_each(sk, node, &net->packet.sklist) {
1934 struct packet_sock *po = pkt_sk(sk);
1935
1936 switch (msg) {
1937 case NETDEV_UNREGISTER:
1938 if (po->mclist)
1939 packet_dev_mclist(dev, po->mclist, -1);
1940
1941
1942 case NETDEV_DOWN:
1943 if (dev->ifindex == po->ifindex) {
1944 spin_lock(&po->bind_lock);
1945 if (po->running) {
1946 __dev_remove_pack(&po->prot_hook);
1947 __sock_put(sk);
1948 po->running = 0;
1949 sk->sk_err = ENETDOWN;
1950 if (!sock_flag(sk, SOCK_DEAD))
1951 sk->sk_error_report(sk);
1952 }
1953 if (msg == NETDEV_UNREGISTER) {
1954 po->ifindex = -1;
1955 po->prot_hook.dev = NULL;
1956 }
1957 spin_unlock(&po->bind_lock);
1958 }
1959 break;
1960 case NETDEV_UP:
1961 spin_lock(&po->bind_lock);
1962 if (dev->ifindex == po->ifindex && po->num &&
1963 !po->running) {
1964 dev_add_pack(&po->prot_hook);
1965 sock_hold(sk);
1966 po->running = 1;
1967 }
1968 spin_unlock(&po->bind_lock);
1969 break;
1970 }
1971 }
1972 read_unlock(&net->packet.sklist_lock);
1973 return NOTIFY_DONE;
1974}
1975
1976
1977static int packet_ioctl(struct socket *sock, unsigned int cmd,
1978 unsigned long arg)
1979{
1980 struct sock *sk = sock->sk;
1981
1982 switch (cmd) {
1983 case SIOCOUTQ:
1984 {
1985 int amount = sk_wmem_alloc_get(sk);
1986
1987 return put_user(amount, (int __user *)arg);
1988 }
1989 case SIOCINQ:
1990 {
1991 struct sk_buff *skb;
1992 int amount = 0;
1993
1994 spin_lock_bh(&sk->sk_receive_queue.lock);
1995 skb = skb_peek(&sk->sk_receive_queue);
1996 if (skb)
1997 amount = skb->len;
1998 spin_unlock_bh(&sk->sk_receive_queue.lock);
1999 return put_user(amount, (int __user *)arg);
2000 }
2001 case SIOCGSTAMP:
2002 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2003 case SIOCGSTAMPNS:
2004 return sock_get_timestampns(sk, (struct timespec __user *)arg);
2005
2006#ifdef CONFIG_INET
2007 case SIOCADDRT:
2008 case SIOCDELRT:
2009 case SIOCDARP:
2010 case SIOCGARP:
2011 case SIOCSARP:
2012 case SIOCGIFADDR:
2013 case SIOCSIFADDR:
2014 case SIOCGIFBRDADDR:
2015 case SIOCSIFBRDADDR:
2016 case SIOCGIFNETMASK:
2017 case SIOCSIFNETMASK:
2018 case SIOCGIFDSTADDR:
2019 case SIOCSIFDSTADDR:
2020 case SIOCSIFFLAGS:
2021 if (!net_eq(sock_net(sk), &init_net))
2022 return -ENOIOCTLCMD;
2023 return inet_dgram_ops.ioctl(sock, cmd, arg);
2024#endif
2025
2026 default:
2027 return -ENOIOCTLCMD;
2028 }
2029 return 0;
2030}
2031
2032#ifndef CONFIG_PACKET_MMAP
2033#define packet_mmap sock_no_mmap
2034#define packet_poll datagram_poll
2035#else
2036
2037static unsigned int packet_poll(struct file *file, struct socket *sock,
2038 poll_table *wait)
2039{
2040 struct sock *sk = sock->sk;
2041 struct packet_sock *po = pkt_sk(sk);
2042 unsigned int mask = datagram_poll(file, sock, wait);
2043
2044 spin_lock_bh(&sk->sk_receive_queue.lock);
2045 if (po->rx_ring.pg_vec) {
2046 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
2047 mask |= POLLIN | POLLRDNORM;
2048 }
2049 spin_unlock_bh(&sk->sk_receive_queue.lock);
2050 spin_lock_bh(&sk->sk_write_queue.lock);
2051 if (po->tx_ring.pg_vec) {
2052 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2053 mask |= POLLOUT | POLLWRNORM;
2054 }
2055 spin_unlock_bh(&sk->sk_write_queue.lock);
2056 return mask;
2057}
2058
2059
2060
2061
2062
2063
2064static void packet_mm_open(struct vm_area_struct *vma)
2065{
2066 struct file *file = vma->vm_file;
2067 struct socket *sock = file->private_data;
2068 struct sock *sk = sock->sk;
2069
2070 if (sk)
2071 atomic_inc(&pkt_sk(sk)->mapped);
2072}
2073
2074static void packet_mm_close(struct vm_area_struct *vma)
2075{
2076 struct file *file = vma->vm_file;
2077 struct socket *sock = file->private_data;
2078 struct sock *sk = sock->sk;
2079
2080 if (sk)
2081 atomic_dec(&pkt_sk(sk)->mapped);
2082}
2083
2084static const struct vm_operations_struct packet_mmap_ops = {
2085 .open = packet_mm_open,
2086 .close = packet_mm_close,
2087};
2088
2089static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
2090{
2091 int i;
2092
2093 for (i = 0; i < len; i++) {
2094 if (likely(pg_vec[i]))
2095 free_pages((unsigned long) pg_vec[i], order);
2096 }
2097 kfree(pg_vec);
2098}
2099
2100static inline char *alloc_one_pg_vec_page(unsigned long order)
2101{
2102 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;
2103
2104 return (char *) __get_free_pages(gfp_flags, order);
2105}
2106
2107static char **alloc_pg_vec(struct tpacket_req *req, int order)
2108{
2109 unsigned int block_nr = req->tp_block_nr;
2110 char **pg_vec;
2111 int i;
2112
2113 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
2114 if (unlikely(!pg_vec))
2115 goto out;
2116
2117 for (i = 0; i < block_nr; i++) {
2118 pg_vec[i] = alloc_one_pg_vec_page(order);
2119 if (unlikely(!pg_vec[i]))
2120 goto out_free_pgvec;
2121 }
2122
2123out:
2124 return pg_vec;
2125
2126out_free_pgvec:
2127 free_pg_vec(pg_vec, order, block_nr);
2128 pg_vec = NULL;
2129 goto out;
2130}
2131
2132static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2133 int closing, int tx_ring)
2134{
2135 char **pg_vec = NULL;
2136 struct packet_sock *po = pkt_sk(sk);
2137 int was_running, order = 0;
2138 struct packet_ring_buffer *rb;
2139 struct sk_buff_head *rb_queue;
2140 __be16 num;
2141 int err;
2142
2143 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2144 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2145
2146 err = -EBUSY;
2147 if (!closing) {
2148 if (atomic_read(&po->mapped))
2149 goto out;
2150 if (atomic_read(&rb->pending))
2151 goto out;
2152 }
2153
2154 if (req->tp_block_nr) {
2155
2156 err = -EBUSY;
2157 if (unlikely(rb->pg_vec))
2158 goto out;
2159
2160 switch (po->tp_version) {
2161 case TPACKET_V1:
2162 po->tp_hdrlen = TPACKET_HDRLEN;
2163 break;
2164 case TPACKET_V2:
2165 po->tp_hdrlen = TPACKET2_HDRLEN;
2166 break;
2167 }
2168
2169 err = -EINVAL;
2170 if (unlikely((int)req->tp_block_size <= 0))
2171 goto out;
2172 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
2173 goto out;
2174 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
2175 po->tp_reserve))
2176 goto out;
2177 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
2178 goto out;
2179
2180 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2181 if (unlikely(rb->frames_per_block <= 0))
2182 goto out;
2183 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2184 req->tp_frame_nr))
2185 goto out;
2186
2187 err = -ENOMEM;
2188 order = get_order(req->tp_block_size);
2189 pg_vec = alloc_pg_vec(req, order);
2190 if (unlikely(!pg_vec))
2191 goto out;
2192 }
2193
2194 else {
2195 err = -EINVAL;
2196 if (unlikely(req->tp_frame_nr))
2197 goto out;
2198 }
2199
2200 lock_sock(sk);
2201
2202
2203 spin_lock(&po->bind_lock);
2204 was_running = po->running;
2205 num = po->num;
2206 if (was_running) {
2207 __dev_remove_pack(&po->prot_hook);
2208 po->num = 0;
2209 po->running = 0;
2210 __sock_put(sk);
2211 }
2212 spin_unlock(&po->bind_lock);
2213
2214 synchronize_net();
2215
2216 err = -EBUSY;
2217 mutex_lock(&po->pg_vec_lock);
2218 if (closing || atomic_read(&po->mapped) == 0) {
2219 err = 0;
2220#define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
2221 spin_lock_bh(&rb_queue->lock);
2222 pg_vec = XC(rb->pg_vec, pg_vec);
2223 rb->frame_max = (req->tp_frame_nr - 1);
2224 rb->head = 0;
2225 rb->frame_size = req->tp_frame_size;
2226 spin_unlock_bh(&rb_queue->lock);
2227
2228 order = XC(rb->pg_vec_order, order);
2229 req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr);
2230
2231 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2232 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2233 tpacket_rcv : packet_rcv;
2234 skb_queue_purge(rb_queue);
2235#undef XC
2236 if (atomic_read(&po->mapped))
2237 pr_err("packet_mmap: vma is busy: %d\n",
2238 atomic_read(&po->mapped));
2239 }
2240 mutex_unlock(&po->pg_vec_lock);
2241
2242 spin_lock(&po->bind_lock);
2243 if (was_running && !po->running) {
2244 sock_hold(sk);
2245 po->running = 1;
2246 po->num = num;
2247 dev_add_pack(&po->prot_hook);
2248 }
2249 spin_unlock(&po->bind_lock);
2250
2251 release_sock(sk);
2252
2253 if (pg_vec)
2254 free_pg_vec(pg_vec, order, req->tp_block_nr);
2255out:
2256 return err;
2257}
2258
2259static int packet_mmap(struct file *file, struct socket *sock,
2260 struct vm_area_struct *vma)
2261{
2262 struct sock *sk = sock->sk;
2263 struct packet_sock *po = pkt_sk(sk);
2264 unsigned long size, expected_size;
2265 struct packet_ring_buffer *rb;
2266 unsigned long start;
2267 int err = -EINVAL;
2268 int i;
2269
2270 if (vma->vm_pgoff)
2271 return -EINVAL;
2272
2273 mutex_lock(&po->pg_vec_lock);
2274
2275 expected_size = 0;
2276 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2277 if (rb->pg_vec) {
2278 expected_size += rb->pg_vec_len
2279 * rb->pg_vec_pages
2280 * PAGE_SIZE;
2281 }
2282 }
2283
2284 if (expected_size == 0)
2285 goto out;
2286
2287 size = vma->vm_end - vma->vm_start;
2288 if (size != expected_size)
2289 goto out;
2290
2291 start = vma->vm_start;
2292 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2293 if (rb->pg_vec == NULL)
2294 continue;
2295
2296 for (i = 0; i < rb->pg_vec_len; i++) {
2297 struct page *page = virt_to_page(rb->pg_vec[i]);
2298 int pg_num;
2299
2300 for (pg_num = 0; pg_num < rb->pg_vec_pages;
2301 pg_num++, page++) {
2302 err = vm_insert_page(vma, start, page);
2303 if (unlikely(err))
2304 goto out;
2305 start += PAGE_SIZE;
2306 }
2307 }
2308 }
2309
2310 atomic_inc(&po->mapped);
2311 vma->vm_ops = &packet_mmap_ops;
2312 err = 0;
2313
2314out:
2315 mutex_unlock(&po->pg_vec_lock);
2316 return err;
2317}
2318#endif
2319
2320
2321static const struct proto_ops packet_ops_spkt = {
2322 .family = PF_PACKET,
2323 .owner = THIS_MODULE,
2324 .release = packet_release,
2325 .bind = packet_bind_spkt,
2326 .connect = sock_no_connect,
2327 .socketpair = sock_no_socketpair,
2328 .accept = sock_no_accept,
2329 .getname = packet_getname_spkt,
2330 .poll = datagram_poll,
2331 .ioctl = packet_ioctl,
2332 .listen = sock_no_listen,
2333 .shutdown = sock_no_shutdown,
2334 .setsockopt = sock_no_setsockopt,
2335 .getsockopt = sock_no_getsockopt,
2336 .sendmsg = packet_sendmsg_spkt,
2337 .recvmsg = packet_recvmsg,
2338 .mmap = sock_no_mmap,
2339 .sendpage = sock_no_sendpage,
2340};
2341
2342static const struct proto_ops packet_ops = {
2343 .family = PF_PACKET,
2344 .owner = THIS_MODULE,
2345 .release = packet_release,
2346 .bind = packet_bind,
2347 .connect = sock_no_connect,
2348 .socketpair = sock_no_socketpair,
2349 .accept = sock_no_accept,
2350 .getname = packet_getname,
2351 .poll = packet_poll,
2352 .ioctl = packet_ioctl,
2353 .listen = sock_no_listen,
2354 .shutdown = sock_no_shutdown,
2355 .setsockopt = packet_setsockopt,
2356 .getsockopt = packet_getsockopt,
2357 .sendmsg = packet_sendmsg,
2358 .recvmsg = packet_recvmsg,
2359 .mmap = packet_mmap,
2360 .sendpage = sock_no_sendpage,
2361};
2362
2363static struct net_proto_family packet_family_ops = {
2364 .family = PF_PACKET,
2365 .create = packet_create,
2366 .owner = THIS_MODULE,
2367};
2368
2369static struct notifier_block packet_netdev_notifier = {
2370 .notifier_call = packet_notifier,
2371};
2372
2373#ifdef CONFIG_PROC_FS
2374static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
2375{
2376 struct sock *s;
2377 struct hlist_node *node;
2378
2379 sk_for_each(s, node, &net->packet.sklist) {
2380 if (!off--)
2381 return s;
2382 }
2383 return NULL;
2384}
2385
2386static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2387 __acquires(seq_file_net(seq)->packet.sklist_lock)
2388{
2389 struct net *net = seq_file_net(seq);
2390 read_lock(&net->packet.sklist_lock);
2391 return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
2392}
2393
2394static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2395{
2396 struct net *net = seq_file_net(seq);
2397 ++*pos;
2398 return (v == SEQ_START_TOKEN)
2399 ? sk_head(&net->packet.sklist)
2400 : sk_next((struct sock *)v) ;
2401}
2402
2403static void packet_seq_stop(struct seq_file *seq, void *v)
2404 __releases(seq_file_net(seq)->packet.sklist_lock)
2405{
2406 struct net *net = seq_file_net(seq);
2407 read_unlock(&net->packet.sklist_lock);
2408}
2409
2410static int packet_seq_show(struct seq_file *seq, void *v)
2411{
2412 if (v == SEQ_START_TOKEN)
2413 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2414 else {
2415 struct sock *s = v;
2416 const struct packet_sock *po = pkt_sk(s);
2417
2418 seq_printf(seq,
2419 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2420 s,
2421 atomic_read(&s->sk_refcnt),
2422 s->sk_type,
2423 ntohs(po->num),
2424 po->ifindex,
2425 po->running,
2426 atomic_read(&s->sk_rmem_alloc),
2427 sock_i_uid(s),
2428 sock_i_ino(s));
2429 }
2430
2431 return 0;
2432}
2433
2434static const struct seq_operations packet_seq_ops = {
2435 .start = packet_seq_start,
2436 .next = packet_seq_next,
2437 .stop = packet_seq_stop,
2438 .show = packet_seq_show,
2439};
2440
2441static int packet_seq_open(struct inode *inode, struct file *file)
2442{
2443 return seq_open_net(inode, file, &packet_seq_ops,
2444 sizeof(struct seq_net_private));
2445}
2446
2447static const struct file_operations packet_seq_fops = {
2448 .owner = THIS_MODULE,
2449 .open = packet_seq_open,
2450 .read = seq_read,
2451 .llseek = seq_lseek,
2452 .release = seq_release_net,
2453};
2454
2455#endif
2456
2457static int packet_net_init(struct net *net)
2458{
2459 rwlock_init(&net->packet.sklist_lock);
2460 INIT_HLIST_HEAD(&net->packet.sklist);
2461
2462 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2463 return -ENOMEM;
2464
2465 return 0;
2466}
2467
2468static void packet_net_exit(struct net *net)
2469{
2470 proc_net_remove(net, "packet");
2471}
2472
2473static struct pernet_operations packet_net_ops = {
2474 .init = packet_net_init,
2475 .exit = packet_net_exit,
2476};
2477
2478
2479static void __exit packet_exit(void)
2480{
2481 unregister_netdevice_notifier(&packet_netdev_notifier);
2482 unregister_pernet_subsys(&packet_net_ops);
2483 sock_unregister(PF_PACKET);
2484 proto_unregister(&packet_proto);
2485}
2486
2487static int __init packet_init(void)
2488{
2489 int rc = proto_register(&packet_proto, 0);
2490
2491 if (rc != 0)
2492 goto out;
2493
2494 sock_register(&packet_family_ops);
2495 register_pernet_subsys(&packet_net_ops);
2496 register_netdevice_notifier(&packet_netdev_notifier);
2497out:
2498 return rc;
2499}
2500
2501module_init(packet_init);
2502module_exit(packet_exit);
2503MODULE_LICENSE("GPL");
2504MODULE_ALIAS_NETPROTO(PF_PACKET);
2505