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TOMOYO Linux Cross Reference
Linux/net/packet/af_packet.c

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  1 /*
  2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  3  *              operating system.  INET is implemented using the  BSD Socket
  4  *              interface as the means of communication with the user level.
  5  *
  6  *              PACKET - implements raw packet sockets.
  7  *
  8  * Authors:     Ross Biro
  9  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 10  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
 11  *
 12  * Fixes:
 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
 41  *                                      and packet_mreq.
 42  *              Johann Baudy    :       Added TX RING.
 43  *
 44  *              This program is free software; you can redistribute it and/or
 45  *              modify it under the terms of the GNU General Public License
 46  *              as published by the Free Software Foundation; either version
 47  *              2 of the License, or (at your option) any later version.
 48  *
 49  */
 50 
 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 <linux/slab.h>
 64 #include <linux/vmalloc.h>
 65 #include <net/net_namespace.h>
 66 #include <net/ip.h>
 67 #include <net/protocol.h>
 68 #include <linux/skbuff.h>
 69 #include <net/sock.h>
 70 #include <linux/errno.h>
 71 #include <linux/timer.h>
 72 #include <asm/system.h>
 73 #include <asm/uaccess.h>
 74 #include <asm/ioctls.h>
 75 #include <asm/page.h>
 76 #include <asm/cacheflush.h>
 77 #include <asm/io.h>
 78 #include <linux/proc_fs.h>
 79 #include <linux/seq_file.h>
 80 #include <linux/poll.h>
 81 #include <linux/module.h>
 82 #include <linux/init.h>
 83 #include <linux/mutex.h>
 84 #include <linux/if_vlan.h>
 85 #include <linux/virtio_net.h>
 86 #include <linux/errqueue.h>
 87 #include <linux/net_tstamp.h>
 88 
 89 #ifdef CONFIG_INET
 90 #include <net/inet_common.h>
 91 #endif
 92 
 93 /*
 94    Assumptions:
 95    - if device has no dev->hard_header routine, it adds and removes ll header
 96      inside itself. In this case ll header is invisible outside of device,
 97      but higher levels still should reserve dev->hard_header_len.
 98      Some devices are enough clever to reallocate skb, when header
 99      will not fit to reserved space (tunnel), another ones are silly
100      (PPP).
101    - packet socket receives packets with pulled ll header,
102      so that SOCK_RAW should push it back.
103 
104 On receive:
105 -----------
106 
107 Incoming, dev->hard_header!=NULL
108    mac_header -> ll header
109    data       -> data
110 
111 Outgoing, dev->hard_header!=NULL
112    mac_header -> ll header
113    data       -> ll header
114 
115 Incoming, dev->hard_header==NULL
116    mac_header -> UNKNOWN position. It is very likely, that it points to ll
117                  header.  PPP makes it, that is wrong, because introduce
118                  assymetry between rx and tx paths.
119    data       -> data
120 
121 Outgoing, dev->hard_header==NULL
122    mac_header -> data. ll header is still not built!
123    data       -> data
124 
125 Resume
126   If dev->hard_header==NULL we are unlikely to restore sensible ll header.
127 
128 
129 On transmit:
130 ------------
131 
132 dev->hard_header != NULL
133    mac_header -> ll header
134    data       -> ll header
135 
136 dev->hard_header == NULL (ll header is added by device, we cannot control it)
137    mac_header -> data
138    data       -> data
139 
140    We should set nh.raw on output to correct posistion,
141    packet classifier depends on it.
142  */
143 
144 /* Private packet socket structures. */
145 
146 struct packet_mclist {
147         struct packet_mclist    *next;
148         int                     ifindex;
149         int                     count;
150         unsigned short          type;
151         unsigned short          alen;
152         unsigned char           addr[MAX_ADDR_LEN];
153 };
154 /* identical to struct packet_mreq except it has
155  * a longer address field.
156  */
157 struct packet_mreq_max {
158         int             mr_ifindex;
159         unsigned short  mr_type;
160         unsigned short  mr_alen;
161         unsigned char   mr_address[MAX_ADDR_LEN];
162 };
163 
164 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
165                 int closing, int tx_ring);
166 
167 struct pgv {
168         char *buffer;
169 };
170 
171 struct packet_ring_buffer {
172         struct pgv              *pg_vec;
173         unsigned int            head;
174         unsigned int            frames_per_block;
175         unsigned int            frame_size;
176         unsigned int            frame_max;
177 
178         unsigned int            pg_vec_order;
179         unsigned int            pg_vec_pages;
180         unsigned int            pg_vec_len;
181 
182         atomic_t                pending;
183 };
184 
185 struct packet_sock;
186 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
187 
188 static void packet_flush_mclist(struct sock *sk);
189 
190 struct packet_sock {
191         /* struct sock has to be the first member of packet_sock */
192         struct sock             sk;
193         struct tpacket_stats    stats;
194         struct packet_ring_buffer       rx_ring;
195         struct packet_ring_buffer       tx_ring;
196         int                     copy_thresh;
197         spinlock_t              bind_lock;
198         struct mutex            pg_vec_lock;
199         unsigned int            running:1,      /* prot_hook is attached*/
200                                 auxdata:1,
201                                 origdev:1,
202                                 has_vnet_hdr:1;
203         int                     ifindex;        /* bound device         */
204         __be16                  num;
205         struct packet_mclist    *mclist;
206         atomic_t                mapped;
207         enum tpacket_versions   tp_version;
208         unsigned int            tp_hdrlen;
209         unsigned int            tp_reserve;
210         unsigned int            tp_loss:1;
211         unsigned int            tp_tstamp;
212         struct packet_type      prot_hook ____cacheline_aligned_in_smp;
213 };
214 
215 struct packet_skb_cb {
216         unsigned int origlen;
217         union {
218                 struct sockaddr_pkt pkt;
219                 struct sockaddr_ll ll;
220         } sa;
221 };
222 
223 #define PACKET_SKB_CB(__skb)    ((struct packet_skb_cb *)((__skb)->cb))
224 
225 static inline __pure struct page *pgv_to_page(void *addr)
226 {
227         if (is_vmalloc_addr(addr))
228                 return vmalloc_to_page(addr);
229         return virt_to_page(addr);
230 }
231 
232 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
233 {
234         union {
235                 struct tpacket_hdr *h1;
236                 struct tpacket2_hdr *h2;
237                 void *raw;
238         } h;
239 
240         h.raw = frame;
241         switch (po->tp_version) {
242         case TPACKET_V1:
243                 h.h1->tp_status = status;
244                 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
245                 break;
246         case TPACKET_V2:
247                 h.h2->tp_status = status;
248                 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
249                 break;
250         default:
251                 pr_err("TPACKET version not supported\n");
252                 BUG();
253         }
254 
255         smp_wmb();
256 }
257 
258 static int __packet_get_status(struct packet_sock *po, void *frame)
259 {
260         union {
261                 struct tpacket_hdr *h1;
262                 struct tpacket2_hdr *h2;
263                 void *raw;
264         } h;
265 
266         smp_rmb();
267 
268         h.raw = frame;
269         switch (po->tp_version) {
270         case TPACKET_V1:
271                 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
272                 return h.h1->tp_status;
273         case TPACKET_V2:
274                 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
275                 return h.h2->tp_status;
276         default:
277                 pr_err("TPACKET version not supported\n");
278                 BUG();
279                 return 0;
280         }
281 }
282 
283 static void *packet_lookup_frame(struct packet_sock *po,
284                 struct packet_ring_buffer *rb,
285                 unsigned int position,
286                 int status)
287 {
288         unsigned int pg_vec_pos, frame_offset;
289         union {
290                 struct tpacket_hdr *h1;
291                 struct tpacket2_hdr *h2;
292                 void *raw;
293         } h;
294 
295         pg_vec_pos = position / rb->frames_per_block;
296         frame_offset = position % rb->frames_per_block;
297 
298         h.raw = rb->pg_vec[pg_vec_pos].buffer +
299                 (frame_offset * rb->frame_size);
300 
301         if (status != __packet_get_status(po, h.raw))
302                 return NULL;
303 
304         return h.raw;
305 }
306 
307 static inline void *packet_current_frame(struct packet_sock *po,
308                 struct packet_ring_buffer *rb,
309                 int status)
310 {
311         return packet_lookup_frame(po, rb, rb->head, status);
312 }
313 
314 static inline void *packet_previous_frame(struct packet_sock *po,
315                 struct packet_ring_buffer *rb,
316                 int status)
317 {
318         unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
319         return packet_lookup_frame(po, rb, previous, status);
320 }
321 
322 static inline void packet_increment_head(struct packet_ring_buffer *buff)
323 {
324         buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
325 }
326 
327 static inline struct packet_sock *pkt_sk(struct sock *sk)
328 {
329         return (struct packet_sock *)sk;
330 }
331 
332 static void packet_sock_destruct(struct sock *sk)
333 {
334         skb_queue_purge(&sk->sk_error_queue);
335 
336         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
337         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
338 
339         if (!sock_flag(sk, SOCK_DEAD)) {
340                 pr_err("Attempt to release alive packet socket: %p\n", sk);
341                 return;
342         }
343 
344         sk_refcnt_debug_dec(sk);
345 }
346 
347 
348 static const struct proto_ops packet_ops;
349 
350 static const struct proto_ops packet_ops_spkt;
351 
352 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
353                            struct packet_type *pt, struct net_device *orig_dev)
354 {
355         struct sock *sk;
356         struct sockaddr_pkt *spkt;
357 
358         /*
359          *      When we registered the protocol we saved the socket in the data
360          *      field for just this event.
361          */
362 
363         sk = pt->af_packet_priv;
364 
365         /*
366          *      Yank back the headers [hope the device set this
367          *      right or kerboom...]
368          *
369          *      Incoming packets have ll header pulled,
370          *      push it back.
371          *
372          *      For outgoing ones skb->data == skb_mac_header(skb)
373          *      so that this procedure is noop.
374          */
375 
376         if (skb->pkt_type == PACKET_LOOPBACK)
377                 goto out;
378 
379         if (!net_eq(dev_net(dev), sock_net(sk)))
380                 goto out;
381 
382         skb = skb_share_check(skb, GFP_ATOMIC);
383         if (skb == NULL)
384                 goto oom;
385 
386         /* drop any routing info */
387         skb_dst_drop(skb);
388 
389         /* drop conntrack reference */
390         nf_reset(skb);
391 
392         spkt = &PACKET_SKB_CB(skb)->sa.pkt;
393 
394         skb_push(skb, skb->data - skb_mac_header(skb));
395 
396         /*
397          *      The SOCK_PACKET socket receives _all_ frames.
398          */
399 
400         spkt->spkt_family = dev->type;
401         strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
402         spkt->spkt_protocol = skb->protocol;
403 
404         /*
405          *      Charge the memory to the socket. This is done specifically
406          *      to prevent sockets using all the memory up.
407          */
408 
409         if (sock_queue_rcv_skb(sk, skb) == 0)
410                 return 0;
411 
412 out:
413         kfree_skb(skb);
414 oom:
415         return 0;
416 }
417 
418 
419 /*
420  *      Output a raw packet to a device layer. This bypasses all the other
421  *      protocol layers and you must therefore supply it with a complete frame
422  */
423 
424 static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
425                                struct msghdr *msg, size_t len)
426 {
427         struct sock *sk = sock->sk;
428         struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
429         struct sk_buff *skb = NULL;
430         struct net_device *dev;
431         __be16 proto = 0;
432         int err;
433 
434         /*
435          *      Get and verify the address.
436          */
437 
438         if (saddr) {
439                 if (msg->msg_namelen < sizeof(struct sockaddr))
440                         return -EINVAL;
441                 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
442                         proto = saddr->spkt_protocol;
443         } else
444                 return -ENOTCONN;       /* SOCK_PACKET must be sent giving an address */
445 
446         /*
447          *      Find the device first to size check it
448          */
449 
450         saddr->spkt_device[13] = 0;
451 retry:
452         rcu_read_lock();
453         dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
454         err = -ENODEV;
455         if (dev == NULL)
456                 goto out_unlock;
457 
458         err = -ENETDOWN;
459         if (!(dev->flags & IFF_UP))
460                 goto out_unlock;
461 
462         /*
463          * You may not queue a frame bigger than the mtu. This is the lowest level
464          * raw protocol and you must do your own fragmentation at this level.
465          */
466 
467         err = -EMSGSIZE;
468         if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
469                 goto out_unlock;
470 
471         if (!skb) {
472                 size_t reserved = LL_RESERVED_SPACE(dev);
473                 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
474 
475                 rcu_read_unlock();
476                 skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL);
477                 if (skb == NULL)
478                         return -ENOBUFS;
479                 /* FIXME: Save some space for broken drivers that write a hard
480                  * header at transmission time by themselves. PPP is the notable
481                  * one here. This should really be fixed at the driver level.
482                  */
483                 skb_reserve(skb, reserved);
484                 skb_reset_network_header(skb);
485 
486                 /* Try to align data part correctly */
487                 if (hhlen) {
488                         skb->data -= hhlen;
489                         skb->tail -= hhlen;
490                         if (len < hhlen)
491                                 skb_reset_network_header(skb);
492                 }
493                 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
494                 if (err)
495                         goto out_free;
496                 goto retry;
497         }
498 
499         if (len > (dev->mtu + dev->hard_header_len)) {
500                 /* Earlier code assumed this would be a VLAN pkt,
501                  * double-check this now that we have the actual
502                  * packet in hand.
503                  */
504                 struct ethhdr *ehdr;
505                 skb_reset_mac_header(skb);
506                 ehdr = eth_hdr(skb);
507                 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
508                         err = -EMSGSIZE;
509                         goto out_unlock;
510                 }
511         }
512 
513         skb->protocol = proto;
514         skb->dev = dev;
515         skb->priority = sk->sk_priority;
516         skb->mark = sk->sk_mark;
517         err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
518         if (err < 0)
519                 goto out_unlock;
520 
521         dev_queue_xmit(skb);
522         rcu_read_unlock();
523         return len;
524 
525 out_unlock:
526         rcu_read_unlock();
527 out_free:
528         kfree_skb(skb);
529         return err;
530 }
531 
532 static inline unsigned int run_filter(const struct sk_buff *skb,
533                                       const struct sock *sk,
534                                       unsigned int res)
535 {
536         struct sk_filter *filter;
537 
538         rcu_read_lock();
539         filter = rcu_dereference(sk->sk_filter);
540         if (filter != NULL)
541                 res = SK_RUN_FILTER(filter, skb);
542         rcu_read_unlock();
543 
544         return res;
545 }
546 
547 /*
548  * This function makes lazy skb cloning in hope that most of packets
549  * are discarded by BPF.
550  *
551  * Note tricky part: we DO mangle shared skb! skb->data, skb->len
552  * and skb->cb are mangled. It works because (and until) packets
553  * falling here are owned by current CPU. Output packets are cloned
554  * by dev_queue_xmit_nit(), input packets are processed by net_bh
555  * sequencially, so that if we return skb to original state on exit,
556  * we will not harm anyone.
557  */
558 
559 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
560                       struct packet_type *pt, struct net_device *orig_dev)
561 {
562         struct sock *sk;
563         struct sockaddr_ll *sll;
564         struct packet_sock *po;
565         u8 *skb_head = skb->data;
566         int skb_len = skb->len;
567         unsigned int snaplen, res;
568 
569         if (skb->pkt_type == PACKET_LOOPBACK)
570                 goto drop;
571 
572         sk = pt->af_packet_priv;
573         po = pkt_sk(sk);
574 
575         if (!net_eq(dev_net(dev), sock_net(sk)))
576                 goto drop;
577 
578         skb->dev = dev;
579 
580         if (dev->header_ops) {
581                 /* The device has an explicit notion of ll header,
582                  * exported to higher levels.
583                  *
584                  * Otherwise, the device hides details of its frame
585                  * structure, so that corresponding packet head is
586                  * never delivered to user.
587                  */
588                 if (sk->sk_type != SOCK_DGRAM)
589                         skb_push(skb, skb->data - skb_mac_header(skb));
590                 else if (skb->pkt_type == PACKET_OUTGOING) {
591                         /* Special case: outgoing packets have ll header at head */
592                         skb_pull(skb, skb_network_offset(skb));
593                 }
594         }
595 
596         snaplen = skb->len;
597 
598         res = run_filter(skb, sk, snaplen);
599         if (!res)
600                 goto drop_n_restore;
601         if (snaplen > res)
602                 snaplen = res;
603 
604         if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
605             (unsigned)sk->sk_rcvbuf)
606                 goto drop_n_acct;
607 
608         if (skb_shared(skb)) {
609                 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
610                 if (nskb == NULL)
611                         goto drop_n_acct;
612 
613                 if (skb_head != skb->data) {
614                         skb->data = skb_head;
615                         skb->len = skb_len;
616                 }
617                 kfree_skb(skb);
618                 skb = nskb;
619         }
620 
621         BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
622                      sizeof(skb->cb));
623 
624         sll = &PACKET_SKB_CB(skb)->sa.ll;
625         sll->sll_family = AF_PACKET;
626         sll->sll_hatype = dev->type;
627         sll->sll_protocol = skb->protocol;
628         sll->sll_pkttype = skb->pkt_type;
629         if (unlikely(po->origdev))
630                 sll->sll_ifindex = orig_dev->ifindex;
631         else
632                 sll->sll_ifindex = dev->ifindex;
633 
634         sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
635 
636         PACKET_SKB_CB(skb)->origlen = skb->len;
637 
638         if (pskb_trim(skb, snaplen))
639                 goto drop_n_acct;
640 
641         skb_set_owner_r(skb, sk);
642         skb->dev = NULL;
643         skb_dst_drop(skb);
644 
645         /* drop conntrack reference */
646         nf_reset(skb);
647 
648         spin_lock(&sk->sk_receive_queue.lock);
649         po->stats.tp_packets++;
650         skb->dropcount = atomic_read(&sk->sk_drops);
651         __skb_queue_tail(&sk->sk_receive_queue, skb);
652         spin_unlock(&sk->sk_receive_queue.lock);
653         sk->sk_data_ready(sk, skb->len);
654         return 0;
655 
656 drop_n_acct:
657         spin_lock(&sk->sk_receive_queue.lock);
658         po->stats.tp_drops++;
659         atomic_inc(&sk->sk_drops);
660         spin_unlock(&sk->sk_receive_queue.lock);
661 
662 drop_n_restore:
663         if (skb_head != skb->data && skb_shared(skb)) {
664                 skb->data = skb_head;
665                 skb->len = skb_len;
666         }
667 drop:
668         consume_skb(skb);
669         return 0;
670 }
671 
672 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
673                        struct packet_type *pt, struct net_device *orig_dev)
674 {
675         struct sock *sk;
676         struct packet_sock *po;
677         struct sockaddr_ll *sll;
678         union {
679                 struct tpacket_hdr *h1;
680                 struct tpacket2_hdr *h2;
681                 void *raw;
682         } h;
683         u8 *skb_head = skb->data;
684         int skb_len = skb->len;
685         unsigned int snaplen, res;
686         unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
687         unsigned short macoff, netoff, hdrlen;
688         struct sk_buff *copy_skb = NULL;
689         struct timeval tv;
690         struct timespec ts;
691         struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
692 
693         if (skb->pkt_type == PACKET_LOOPBACK)
694                 goto drop;
695 
696         sk = pt->af_packet_priv;
697         po = pkt_sk(sk);
698 
699         if (!net_eq(dev_net(dev), sock_net(sk)))
700                 goto drop;
701 
702         if (dev->header_ops) {
703                 if (sk->sk_type != SOCK_DGRAM)
704                         skb_push(skb, skb->data - skb_mac_header(skb));
705                 else if (skb->pkt_type == PACKET_OUTGOING) {
706                         /* Special case: outgoing packets have ll header at head */
707                         skb_pull(skb, skb_network_offset(skb));
708                 }
709         }
710 
711         if (skb->ip_summed == CHECKSUM_PARTIAL)
712                 status |= TP_STATUS_CSUMNOTREADY;
713 
714         snaplen = skb->len;
715 
716         res = run_filter(skb, sk, snaplen);
717         if (!res)
718                 goto drop_n_restore;
719         if (snaplen > res)
720                 snaplen = res;
721 
722         if (sk->sk_type == SOCK_DGRAM) {
723                 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
724                                   po->tp_reserve;
725         } else {
726                 unsigned maclen = skb_network_offset(skb);
727                 netoff = TPACKET_ALIGN(po->tp_hdrlen +
728                                        (maclen < 16 ? 16 : maclen)) +
729                         po->tp_reserve;
730                 macoff = netoff - maclen;
731         }
732 
733         if (macoff + snaplen > po->rx_ring.frame_size) {
734                 if (po->copy_thresh &&
735                     atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
736                     (unsigned)sk->sk_rcvbuf) {
737                         if (skb_shared(skb)) {
738                                 copy_skb = skb_clone(skb, GFP_ATOMIC);
739                         } else {
740                                 copy_skb = skb_get(skb);
741                                 skb_head = skb->data;
742                         }
743                         if (copy_skb)
744                                 skb_set_owner_r(copy_skb, sk);
745                 }
746                 snaplen = po->rx_ring.frame_size - macoff;
747                 if ((int)snaplen < 0)
748                         snaplen = 0;
749         }
750 
751         spin_lock(&sk->sk_receive_queue.lock);
752         h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
753         if (!h.raw)
754                 goto ring_is_full;
755         packet_increment_head(&po->rx_ring);
756         po->stats.tp_packets++;
757         if (copy_skb) {
758                 status |= TP_STATUS_COPY;
759                 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
760         }
761         if (!po->stats.tp_drops)
762                 status &= ~TP_STATUS_LOSING;
763         spin_unlock(&sk->sk_receive_queue.lock);
764 
765         skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
766 
767         switch (po->tp_version) {
768         case TPACKET_V1:
769                 h.h1->tp_len = skb->len;
770                 h.h1->tp_snaplen = snaplen;
771                 h.h1->tp_mac = macoff;
772                 h.h1->tp_net = netoff;
773                 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
774                                 && shhwtstamps->syststamp.tv64)
775                         tv = ktime_to_timeval(shhwtstamps->syststamp);
776                 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
777                                 && shhwtstamps->hwtstamp.tv64)
778                         tv = ktime_to_timeval(shhwtstamps->hwtstamp);
779                 else if (skb->tstamp.tv64)
780                         tv = ktime_to_timeval(skb->tstamp);
781                 else
782                         do_gettimeofday(&tv);
783                 h.h1->tp_sec = tv.tv_sec;
784                 h.h1->tp_usec = tv.tv_usec;
785                 hdrlen = sizeof(*h.h1);
786                 break;
787         case TPACKET_V2:
788                 h.h2->tp_len = skb->len;
789                 h.h2->tp_snaplen = snaplen;
790                 h.h2->tp_mac = macoff;
791                 h.h2->tp_net = netoff;
792                 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
793                                 && shhwtstamps->syststamp.tv64)
794                         ts = ktime_to_timespec(shhwtstamps->syststamp);
795                 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
796                                 && shhwtstamps->hwtstamp.tv64)
797                         ts = ktime_to_timespec(shhwtstamps->hwtstamp);
798                 else if (skb->tstamp.tv64)
799                         ts = ktime_to_timespec(skb->tstamp);
800                 else
801                         getnstimeofday(&ts);
802                 h.h2->tp_sec = ts.tv_sec;
803                 h.h2->tp_nsec = ts.tv_nsec;
804                 if (vlan_tx_tag_present(skb)) {
805                         h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
806                         status |= TP_STATUS_VLAN_VALID;
807                 } else {
808                         h.h2->tp_vlan_tci = 0;
809                 }
810                 h.h2->tp_padding = 0;
811                 hdrlen = sizeof(*h.h2);
812                 break;
813         default:
814                 BUG();
815         }
816 
817         sll = h.raw + TPACKET_ALIGN(hdrlen);
818         sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
819         sll->sll_family = AF_PACKET;
820         sll->sll_hatype = dev->type;
821         sll->sll_protocol = skb->protocol;
822         sll->sll_pkttype = skb->pkt_type;
823         if (unlikely(po->origdev))
824                 sll->sll_ifindex = orig_dev->ifindex;
825         else
826                 sll->sll_ifindex = dev->ifindex;
827 
828         __packet_set_status(po, h.raw, status);
829         smp_mb();
830 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
831         {
832                 u8 *start, *end;
833 
834                 end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen);
835                 for (start = h.raw; start < end; start += PAGE_SIZE)
836                         flush_dcache_page(pgv_to_page(start));
837         }
838 #endif
839 
840         sk->sk_data_ready(sk, 0);
841 
842 drop_n_restore:
843         if (skb_head != skb->data && skb_shared(skb)) {
844                 skb->data = skb_head;
845                 skb->len = skb_len;
846         }
847 drop:
848         kfree_skb(skb);
849         return 0;
850 
851 ring_is_full:
852         po->stats.tp_drops++;
853         spin_unlock(&sk->sk_receive_queue.lock);
854 
855         sk->sk_data_ready(sk, 0);
856         kfree_skb(copy_skb);
857         goto drop_n_restore;
858 }
859 
860 static void tpacket_destruct_skb(struct sk_buff *skb)
861 {
862         struct packet_sock *po = pkt_sk(skb->sk);
863         void *ph;
864 
865         BUG_ON(skb == NULL);
866 
867         if (likely(po->tx_ring.pg_vec)) {
868                 ph = skb_shinfo(skb)->destructor_arg;
869                 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
870                 atomic_dec(&po->tx_ring.pending);
871                 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
872         }
873 
874         sock_wfree(skb);
875 }
876 
877 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
878                 void *frame, struct net_device *dev, int size_max,
879                 __be16 proto, unsigned char *addr)
880 {
881         union {
882                 struct tpacket_hdr *h1;
883                 struct tpacket2_hdr *h2;
884                 void *raw;
885         } ph;
886         int to_write, offset, len, tp_len, nr_frags, len_max;
887         struct socket *sock = po->sk.sk_socket;
888         struct page *page;
889         void *data;
890         int err;
891 
892         ph.raw = frame;
893 
894         skb->protocol = proto;
895         skb->dev = dev;
896         skb->priority = po->sk.sk_priority;
897         skb->mark = po->sk.sk_mark;
898         skb_shinfo(skb)->destructor_arg = ph.raw;
899 
900         switch (po->tp_version) {
901         case TPACKET_V2:
902                 tp_len = ph.h2->tp_len;
903                 break;
904         default:
905                 tp_len = ph.h1->tp_len;
906                 break;
907         }
908         if (unlikely(tp_len > size_max)) {
909                 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
910                 return -EMSGSIZE;
911         }
912 
913         skb_reserve(skb, LL_RESERVED_SPACE(dev));
914         skb_reset_network_header(skb);
915 
916         data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
917         to_write = tp_len;
918 
919         if (sock->type == SOCK_DGRAM) {
920                 err = dev_hard_header(skb, dev, ntohs(proto), addr,
921                                 NULL, tp_len);
922                 if (unlikely(err < 0))
923                         return -EINVAL;
924         } else if (dev->hard_header_len) {
925                 /* net device doesn't like empty head */
926                 if (unlikely(tp_len <= dev->hard_header_len)) {
927                         pr_err("packet size is too short (%d < %d)\n",
928                                tp_len, dev->hard_header_len);
929                         return -EINVAL;
930                 }
931 
932                 skb_push(skb, dev->hard_header_len);
933                 err = skb_store_bits(skb, 0, data,
934                                 dev->hard_header_len);
935                 if (unlikely(err))
936                         return err;
937 
938                 data += dev->hard_header_len;
939                 to_write -= dev->hard_header_len;
940         }
941 
942         err = -EFAULT;
943         offset = offset_in_page(data);
944         len_max = PAGE_SIZE - offset;
945         len = ((to_write > len_max) ? len_max : to_write);
946 
947         skb->data_len = to_write;
948         skb->len += to_write;
949         skb->truesize += to_write;
950         atomic_add(to_write, &po->sk.sk_wmem_alloc);
951 
952         while (likely(to_write)) {
953                 nr_frags = skb_shinfo(skb)->nr_frags;
954 
955                 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
956                         pr_err("Packet exceed the number of skb frags(%lu)\n",
957                                MAX_SKB_FRAGS);
958                         return -EFAULT;
959                 }
960 
961                 page = pgv_to_page(data);
962                 data += len;
963                 flush_dcache_page(page);
964                 get_page(page);
965                 skb_fill_page_desc(skb, nr_frags, page, offset, len);
966                 to_write -= len;
967                 offset = 0;
968                 len_max = PAGE_SIZE;
969                 len = ((to_write > len_max) ? len_max : to_write);
970         }
971 
972         return tp_len;
973 }
974 
975 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
976 {
977         struct sk_buff *skb;
978         struct net_device *dev;
979         __be16 proto;
980         int ifindex, err, reserve = 0;
981         void *ph;
982         struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
983         int tp_len, size_max;
984         unsigned char *addr;
985         int len_sum = 0;
986         int status = 0;
987 
988         mutex_lock(&po->pg_vec_lock);
989 
990         err = -EBUSY;
991         if (saddr == NULL) {
992                 ifindex = po->ifindex;
993                 proto   = po->num;
994                 addr    = NULL;
995         } else {
996                 err = -EINVAL;
997                 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
998                         goto out;
999                 if (msg->msg_namelen < (saddr->sll_halen
1000                                         + offsetof(struct sockaddr_ll,
1001                                                 sll_addr)))
1002                         goto out;
1003                 ifindex = saddr->sll_ifindex;
1004                 proto   = saddr->sll_protocol;
1005                 addr    = saddr->sll_addr;
1006         }
1007 
1008         dev = dev_get_by_index(sock_net(&po->sk), ifindex);
1009         err = -ENXIO;
1010         if (unlikely(dev == NULL))
1011                 goto out;
1012 
1013         reserve = dev->hard_header_len;
1014 
1015         err = -ENETDOWN;
1016         if (unlikely(!(dev->flags & IFF_UP)))
1017                 goto out_put;
1018 
1019         size_max = po->tx_ring.frame_size
1020                 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
1021 
1022         if (size_max > dev->mtu + reserve)
1023                 size_max = dev->mtu + reserve;
1024 
1025         do {
1026                 ph = packet_current_frame(po, &po->tx_ring,
1027                                 TP_STATUS_SEND_REQUEST);
1028 
1029                 if (unlikely(ph == NULL)) {
1030                         schedule();
1031                         continue;
1032                 }
1033 
1034                 status = TP_STATUS_SEND_REQUEST;
1035                 skb = sock_alloc_send_skb(&po->sk,
1036                                 LL_ALLOCATED_SPACE(dev)
1037                                 + sizeof(struct sockaddr_ll),
1038                                 0, &err);
1039 
1040                 if (unlikely(skb == NULL))
1041                         goto out_status;
1042 
1043                 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1044                                 addr);
1045 
1046                 if (unlikely(tp_len < 0)) {
1047                         if (po->tp_loss) {
1048                                 __packet_set_status(po, ph,
1049                                                 TP_STATUS_AVAILABLE);
1050                                 packet_increment_head(&po->tx_ring);
1051                                 kfree_skb(skb);
1052                                 continue;
1053                         } else {
1054                                 status = TP_STATUS_WRONG_FORMAT;
1055                                 err = tp_len;
1056                                 goto out_status;
1057                         }
1058                 }
1059 
1060                 skb->destructor = tpacket_destruct_skb;
1061                 __packet_set_status(po, ph, TP_STATUS_SENDING);
1062                 atomic_inc(&po->tx_ring.pending);
1063 
1064                 status = TP_STATUS_SEND_REQUEST;
1065                 err = dev_queue_xmit(skb);
1066                 if (unlikely(err > 0)) {
1067                         err = net_xmit_errno(err);
1068                         if (err && __packet_get_status(po, ph) ==
1069                                    TP_STATUS_AVAILABLE) {
1070                                 /* skb was destructed already */
1071                                 skb = NULL;
1072                                 goto out_status;
1073                         }
1074                         /*
1075                          * skb was dropped but not destructed yet;
1076                          * let's treat it like congestion or err < 0
1077                          */
1078                         err = 0;
1079                 }
1080                 packet_increment_head(&po->tx_ring);
1081                 len_sum += tp_len;
1082         } while (likely((ph != NULL) ||
1083                         ((!(msg->msg_flags & MSG_DONTWAIT)) &&
1084                          (atomic_read(&po->tx_ring.pending))))
1085                 );
1086 
1087         err = len_sum;
1088         goto out_put;
1089 
1090 out_status:
1091         __packet_set_status(po, ph, status);
1092         kfree_skb(skb);
1093 out_put:
1094         dev_put(dev);
1095 out:
1096         mutex_unlock(&po->pg_vec_lock);
1097         return err;
1098 }
1099 
1100 static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
1101                                                size_t reserve, size_t len,
1102                                                size_t linear, int noblock,
1103                                                int *err)
1104 {
1105         struct sk_buff *skb;
1106 
1107         /* Under a page?  Don't bother with paged skb. */
1108         if (prepad + len < PAGE_SIZE || !linear)
1109                 linear = len;
1110 
1111         skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
1112                                    err);
1113         if (!skb)
1114                 return NULL;
1115 
1116         skb_reserve(skb, reserve);
1117         skb_put(skb, linear);
1118         skb->data_len = len - linear;
1119         skb->len += len - linear;
1120 
1121         return skb;
1122 }
1123 
1124 static int packet_snd(struct socket *sock,
1125                           struct msghdr *msg, size_t len)
1126 {
1127         struct sock *sk = sock->sk;
1128         struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1129         struct sk_buff *skb;
1130         struct net_device *dev;
1131         __be16 proto;
1132         unsigned char *addr;
1133         int ifindex, err, reserve = 0;
1134         struct virtio_net_hdr vnet_hdr = { 0 };
1135         int offset = 0;
1136         int vnet_hdr_len;
1137         struct packet_sock *po = pkt_sk(sk);
1138         unsigned short gso_type = 0;
1139 
1140         /*
1141          *      Get and verify the address.
1142          */
1143 
1144         if (saddr == NULL) {
1145                 ifindex = po->ifindex;
1146                 proto   = po->num;
1147                 addr    = NULL;
1148         } else {
1149                 err = -EINVAL;
1150                 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1151                         goto out;
1152                 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1153                         goto out;
1154                 ifindex = saddr->sll_ifindex;
1155                 proto   = saddr->sll_protocol;
1156                 addr    = saddr->sll_addr;
1157         }
1158 
1159 
1160         dev = dev_get_by_index(sock_net(sk), ifindex);
1161         err = -ENXIO;
1162         if (dev == NULL)
1163                 goto out_unlock;
1164         if (sock->type == SOCK_RAW)
1165                 reserve = dev->hard_header_len;
1166 
1167         err = -ENETDOWN;
1168         if (!(dev->flags & IFF_UP))
1169                 goto out_unlock;
1170 
1171         if (po->has_vnet_hdr) {
1172                 vnet_hdr_len = sizeof(vnet_hdr);
1173 
1174                 err = -EINVAL;
1175                 if (len < vnet_hdr_len)
1176                         goto out_unlock;
1177 
1178                 len -= vnet_hdr_len;
1179 
1180                 err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
1181                                        vnet_hdr_len);
1182                 if (err < 0)
1183                         goto out_unlock;
1184 
1185                 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
1186                     (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
1187                       vnet_hdr.hdr_len))
1188                         vnet_hdr.hdr_len = vnet_hdr.csum_start +
1189                                                  vnet_hdr.csum_offset + 2;
1190 
1191                 err = -EINVAL;
1192                 if (vnet_hdr.hdr_len > len)
1193                         goto out_unlock;
1194 
1195                 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1196                         switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1197                         case VIRTIO_NET_HDR_GSO_TCPV4:
1198                                 gso_type = SKB_GSO_TCPV4;
1199                                 break;
1200                         case VIRTIO_NET_HDR_GSO_TCPV6:
1201                                 gso_type = SKB_GSO_TCPV6;
1202                                 break;
1203                         case VIRTIO_NET_HDR_GSO_UDP:
1204                                 gso_type = SKB_GSO_UDP;
1205                                 break;
1206                         default:
1207                                 goto out_unlock;
1208                         }
1209 
1210                         if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
1211                                 gso_type |= SKB_GSO_TCP_ECN;
1212 
1213                         if (vnet_hdr.gso_size == 0)
1214                                 goto out_unlock;
1215 
1216                 }
1217         }
1218 
1219         err = -EMSGSIZE;
1220         if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
1221                 goto out_unlock;
1222 
1223         err = -ENOBUFS;
1224         skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
1225                                LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
1226                                msg->msg_flags & MSG_DONTWAIT, &err);
1227         if (skb == NULL)
1228                 goto out_unlock;
1229 
1230         skb_set_network_header(skb, reserve);
1231 
1232         err = -EINVAL;
1233         if (sock->type == SOCK_DGRAM &&
1234             (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
1235                 goto out_free;
1236 
1237         /* Returns -EFAULT on error */
1238         err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
1239         if (err)
1240                 goto out_free;
1241         err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1242         if (err < 0)
1243                 goto out_free;
1244 
1245         if (!gso_type && (len > dev->mtu + reserve)) {
1246                 /* Earlier code assumed this would be a VLAN pkt,
1247                  * double-check this now that we have the actual
1248                  * packet in hand.
1249                  */
1250                 struct ethhdr *ehdr;
1251                 skb_reset_mac_header(skb);
1252                 ehdr = eth_hdr(skb);
1253                 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
1254                         err = -EMSGSIZE;
1255                         goto out_free;
1256                 }
1257         }
1258 
1259         skb->protocol = proto;
1260         skb->dev = dev;
1261         skb->priority = sk->sk_priority;
1262         skb->mark = sk->sk_mark;
1263 
1264         if (po->has_vnet_hdr) {
1265                 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1266                         if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
1267                                                   vnet_hdr.csum_offset)) {
1268                                 err = -EINVAL;
1269                                 goto out_free;
1270                         }
1271                 }
1272 
1273                 skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
1274                 skb_shinfo(skb)->gso_type = gso_type;
1275 
1276                 /* Header must be checked, and gso_segs computed. */
1277                 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
1278                 skb_shinfo(skb)->gso_segs = 0;
1279 
1280                 len += vnet_hdr_len;
1281         }
1282 
1283         /*
1284          *      Now send it
1285          */
1286 
1287         err = dev_queue_xmit(skb);
1288         if (err > 0 && (err = net_xmit_errno(err)) != 0)
1289                 goto out_unlock;
1290 
1291         dev_put(dev);
1292 
1293         return len;
1294 
1295 out_free:
1296         kfree_skb(skb);
1297 out_unlock:
1298         if (dev)
1299                 dev_put(dev);
1300 out:
1301         return err;
1302 }
1303 
1304 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1305                 struct msghdr *msg, size_t len)
1306 {
1307         struct sock *sk = sock->sk;
1308         struct packet_sock *po = pkt_sk(sk);
1309         if (po->tx_ring.pg_vec)
1310                 return tpacket_snd(po, msg);
1311         else
1312                 return packet_snd(sock, msg, len);
1313 }
1314 
1315 /*
1316  *      Close a PACKET socket. This is fairly simple. We immediately go
1317  *      to 'closed' state and remove our protocol entry in the device list.
1318  */
1319 
1320 static int packet_release(struct socket *sock)
1321 {
1322         struct sock *sk = sock->sk;
1323         struct packet_sock *po;
1324         struct net *net;
1325         struct tpacket_req req;
1326 
1327         if (!sk)
1328                 return 0;
1329 
1330         net = sock_net(sk);
1331         po = pkt_sk(sk);
1332 
1333         spin_lock_bh(&net->packet.sklist_lock);
1334         sk_del_node_init_rcu(sk);
1335         sock_prot_inuse_add(net, sk->sk_prot, -1);
1336         spin_unlock_bh(&net->packet.sklist_lock);
1337 
1338         spin_lock(&po->bind_lock);
1339         if (po->running) {
1340                 /*
1341                  * Remove from protocol table
1342                  */
1343                 po->running = 0;
1344                 po->num = 0;
1345                 __dev_remove_pack(&po->prot_hook);
1346                 __sock_put(sk);
1347         }
1348         spin_unlock(&po->bind_lock);
1349 
1350         packet_flush_mclist(sk);
1351 
1352         if (po->rx_ring.pg_vec) {
1353                 memset(&req, 0, sizeof(req));
1354                 packet_set_ring(sk, &req, 1, 0);
1355         }
1356 
1357         if (po->tx_ring.pg_vec) {
1358                 memset(&req, 0, sizeof(req));
1359                 packet_set_ring(sk, &req, 1, 1);
1360         }
1361 
1362         synchronize_net();
1363         /*
1364          *      Now the socket is dead. No more input will appear.
1365          */
1366         sock_orphan(sk);
1367         sock->sk = NULL;
1368 
1369         /* Purge queues */
1370 
1371         skb_queue_purge(&sk->sk_receive_queue);
1372         sk_refcnt_debug_release(sk);
1373 
1374         sock_put(sk);
1375         return 0;
1376 }
1377 
1378 /*
1379  *      Attach a packet hook.
1380  */
1381 
1382 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1383 {
1384         struct packet_sock *po = pkt_sk(sk);
1385         /*
1386          *      Detach an existing hook if present.
1387          */
1388 
1389         lock_sock(sk);
1390 
1391         spin_lock(&po->bind_lock);
1392         if (po->running) {
1393                 __sock_put(sk);
1394                 po->running = 0;
1395                 po->num = 0;
1396                 spin_unlock(&po->bind_lock);
1397                 dev_remove_pack(&po->prot_hook);
1398                 spin_lock(&po->bind_lock);
1399         }
1400 
1401         po->num = protocol;
1402         po->prot_hook.type = protocol;
1403         po->prot_hook.dev = dev;
1404 
1405         po->ifindex = dev ? dev->ifindex : 0;
1406 
1407         if (protocol == 0)
1408                 goto out_unlock;
1409 
1410         if (!dev || (dev->flags & IFF_UP)) {
1411                 dev_add_pack(&po->prot_hook);
1412                 sock_hold(sk);
1413                 po->running = 1;
1414         } else {
1415                 sk->sk_err = ENETDOWN;
1416                 if (!sock_flag(sk, SOCK_DEAD))
1417                         sk->sk_error_report(sk);
1418         }
1419 
1420 out_unlock:
1421         spin_unlock(&po->bind_lock);
1422         release_sock(sk);
1423         return 0;
1424 }
1425 
1426 /*
1427  *      Bind a packet socket to a device
1428  */
1429 
1430 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
1431                             int addr_len)
1432 {
1433         struct sock *sk = sock->sk;
1434         char name[15];
1435         struct net_device *dev;
1436         int err = -ENODEV;
1437 
1438         /*
1439          *      Check legality
1440          */
1441 
1442         if (addr_len != sizeof(struct sockaddr))
1443                 return -EINVAL;
1444         strlcpy(name, uaddr->sa_data, sizeof(name));
1445 
1446         dev = dev_get_by_name(sock_net(sk), name);
1447         if (dev) {
1448                 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1449                 dev_put(dev);
1450         }
1451         return err;
1452 }
1453 
1454 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1455 {
1456         struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1457         struct sock *sk = sock->sk;
1458         struct net_device *dev = NULL;
1459         int err;
1460 
1461 
1462         /*
1463          *      Check legality
1464          */
1465 
1466         if (addr_len < sizeof(struct sockaddr_ll))
1467                 return -EINVAL;
1468         if (sll->sll_family != AF_PACKET)
1469                 return -EINVAL;
1470 
1471         if (sll->sll_ifindex) {
1472                 err = -ENODEV;
1473                 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1474                 if (dev == NULL)
1475                         goto out;
1476         }
1477         err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1478         if (dev)
1479                 dev_put(dev);
1480 
1481 out:
1482         return err;
1483 }
1484 
1485 static struct proto packet_proto = {
1486         .name     = "PACKET",
1487         .owner    = THIS_MODULE,
1488         .obj_size = sizeof(struct packet_sock),
1489 };
1490 
1491 /*
1492  *      Create a packet of type SOCK_PACKET.
1493  */
1494 
1495 static int packet_create(struct net *net, struct socket *sock, int protocol,
1496                          int kern)
1497 {
1498         struct sock *sk;
1499         struct packet_sock *po;
1500         __be16 proto = (__force __be16)protocol; /* weird, but documented */
1501         int err;
1502 
1503         if (!capable(CAP_NET_RAW))
1504                 return -EPERM;
1505         if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1506             sock->type != SOCK_PACKET)
1507                 return -ESOCKTNOSUPPORT;
1508 
1509         sock->state = SS_UNCONNECTED;
1510 
1511         err = -ENOBUFS;
1512         sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1513         if (sk == NULL)
1514                 goto out;
1515 
1516         sock->ops = &packet_ops;
1517         if (sock->type == SOCK_PACKET)
1518                 sock->ops = &packet_ops_spkt;
1519 
1520         sock_init_data(sock, sk);
1521 
1522         po = pkt_sk(sk);
1523         sk->sk_family = PF_PACKET;
1524         po->num = proto;
1525 
1526         sk->sk_destruct = packet_sock_destruct;
1527         sk_refcnt_debug_inc(sk);
1528 
1529         /*
1530          *      Attach a protocol block
1531          */
1532 
1533         spin_lock_init(&po->bind_lock);
1534         mutex_init(&po->pg_vec_lock);
1535         po->prot_hook.func = packet_rcv;
1536 
1537         if (sock->type == SOCK_PACKET)
1538                 po->prot_hook.func = packet_rcv_spkt;
1539 
1540         po->prot_hook.af_packet_priv = sk;
1541 
1542         if (proto) {
1543                 po->prot_hook.type = proto;
1544                 dev_add_pack(&po->prot_hook);
1545                 sock_hold(sk);
1546                 po->running = 1;
1547         }
1548 
1549         spin_lock_bh(&net->packet.sklist_lock);
1550         sk_add_node_rcu(sk, &net->packet.sklist);
1551         sock_prot_inuse_add(net, &packet_proto, 1);
1552         spin_unlock_bh(&net->packet.sklist_lock);
1553 
1554         return 0;
1555 out:
1556         return err;
1557 }
1558 
1559 static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
1560 {
1561         struct sock_exterr_skb *serr;
1562         struct sk_buff *skb, *skb2;
1563         int copied, err;
1564 
1565         err = -EAGAIN;
1566         skb = skb_dequeue(&sk->sk_error_queue);
1567         if (skb == NULL)
1568                 goto out;
1569 
1570         copied = skb->len;
1571         if (copied > len) {
1572                 msg->msg_flags |= MSG_TRUNC;
1573                 copied = len;
1574         }
1575         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1576         if (err)
1577                 goto out_free_skb;
1578 
1579         sock_recv_timestamp(msg, sk, skb);
1580 
1581         serr = SKB_EXT_ERR(skb);
1582         put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
1583                  sizeof(serr->ee), &serr->ee);
1584 
1585         msg->msg_flags |= MSG_ERRQUEUE;
1586         err = copied;
1587 
1588         /* Reset and regenerate socket error */
1589         spin_lock_bh(&sk->sk_error_queue.lock);
1590         sk->sk_err = 0;
1591         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
1592                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
1593                 spin_unlock_bh(&sk->sk_error_queue.lock);
1594                 sk->sk_error_report(sk);
1595         } else
1596                 spin_unlock_bh(&sk->sk_error_queue.lock);
1597 
1598 out_free_skb:
1599         kfree_skb(skb);
1600 out:
1601         return err;
1602 }
1603 
1604 /*
1605  *      Pull a packet from our receive queue and hand it to the user.
1606  *      If necessary we block.
1607  */
1608 
1609 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1610                           struct msghdr *msg, size_t len, int flags)
1611 {
1612         struct sock *sk = sock->sk;
1613         struct sk_buff *skb;
1614         int copied, err;
1615         struct sockaddr_ll *sll;
1616         int vnet_hdr_len = 0;
1617 
1618         err = -EINVAL;
1619         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
1620                 goto out;
1621 
1622 #if 0
1623         /* What error should we return now? EUNATTACH? */
1624         if (pkt_sk(sk)->ifindex < 0)
1625                 return -ENODEV;
1626 #endif
1627 
1628         if (flags & MSG_ERRQUEUE) {
1629                 err = packet_recv_error(sk, msg, len);
1630                 goto out;
1631         }
1632 
1633         /*
1634          *      Call the generic datagram receiver. This handles all sorts
1635          *      of horrible races and re-entrancy so we can forget about it
1636          *      in the protocol layers.
1637          *
1638          *      Now it will return ENETDOWN, if device have just gone down,
1639          *      but then it will block.
1640          */
1641 
1642         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1643 
1644         /*
1645          *      An error occurred so return it. Because skb_recv_datagram()
1646          *      handles the blocking we don't see and worry about blocking
1647          *      retries.
1648          */
1649 
1650         if (skb == NULL)
1651                 goto out;
1652 
1653         if (pkt_sk(sk)->has_vnet_hdr) {
1654                 struct virtio_net_hdr vnet_hdr = { 0 };
1655 
1656                 err = -EINVAL;
1657                 vnet_hdr_len = sizeof(vnet_hdr);
1658                 if (len < vnet_hdr_len)
1659                         goto out_free;
1660 
1661                 len -= vnet_hdr_len;
1662 
1663                 if (skb_is_gso(skb)) {
1664                         struct skb_shared_info *sinfo = skb_shinfo(skb);
1665 
1666                         /* This is a hint as to how much should be linear. */
1667                         vnet_hdr.hdr_len = skb_headlen(skb);
1668                         vnet_hdr.gso_size = sinfo->gso_size;
1669                         if (sinfo->gso_type & SKB_GSO_TCPV4)
1670                                 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
1671                         else if (sinfo->gso_type & SKB_GSO_TCPV6)
1672                                 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
1673                         else if (sinfo->gso_type & SKB_GSO_UDP)
1674                                 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
1675                         else if (sinfo->gso_type & SKB_GSO_FCOE)
1676                                 goto out_free;
1677                         else
1678                                 BUG();
1679                         if (sinfo->gso_type & SKB_GSO_TCP_ECN)
1680                                 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
1681                 } else
1682                         vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
1683 
1684                 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1685                         vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
1686                         vnet_hdr.csum_start = skb_checksum_start_offset(skb);
1687                         vnet_hdr.csum_offset = skb->csum_offset;
1688                 } /* else everything is zero */
1689 
1690                 err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
1691                                      vnet_hdr_len);
1692                 if (err < 0)
1693                         goto out_free;
1694         }
1695 
1696         /*
1697          *      If the address length field is there to be filled in, we fill
1698          *      it in now.
1699          */
1700 
1701         sll = &PACKET_SKB_CB(skb)->sa.ll;
1702         if (sock->type == SOCK_PACKET)
1703                 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1704         else
1705                 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1706 
1707         /*
1708          *      You lose any data beyond the buffer you gave. If it worries a
1709          *      user program they can ask the device for its MTU anyway.
1710          */
1711 
1712         copied = skb->len;
1713         if (copied > len) {
1714                 copied = len;
1715                 msg->msg_flags |= MSG_TRUNC;
1716         }
1717 
1718         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1719         if (err)
1720                 goto out_free;
1721 
1722         sock_recv_ts_and_drops(msg, sk, skb);
1723 
1724         if (msg->msg_name)
1725                 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1726                        msg->msg_namelen);
1727 
1728         if (pkt_sk(sk)->auxdata) {
1729                 struct tpacket_auxdata aux;
1730 
1731                 aux.tp_status = TP_STATUS_USER;
1732                 if (skb->ip_summed == CHECKSUM_PARTIAL)
1733                         aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1734                 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1735                 aux.tp_snaplen = skb->len;
1736                 aux.tp_mac = 0;
1737                 aux.tp_net = skb_network_offset(skb);
1738                 if (vlan_tx_tag_present(skb)) {
1739                         aux.tp_vlan_tci = vlan_tx_tag_get(skb);
1740                         aux.tp_status |= TP_STATUS_VLAN_VALID;
1741                 } else {
1742                         aux.tp_vlan_tci = 0;
1743                 }
1744                 aux.tp_padding = 0;
1745                 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1746         }
1747 
1748         /*
1749          *      Free or return the buffer as appropriate. Again this
1750          *      hides all the races and re-entrancy issues from us.
1751          */
1752         err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
1753 
1754 out_free:
1755         skb_free_datagram(sk, skb);
1756 out:
1757         return err;
1758 }
1759 
1760 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1761                                int *uaddr_len, int peer)
1762 {
1763         struct net_device *dev;
1764         struct sock *sk = sock->sk;
1765 
1766         if (peer)
1767                 return -EOPNOTSUPP;
1768 
1769         uaddr->sa_family = AF_PACKET;
1770         memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
1771         rcu_read_lock();
1772         dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
1773         if (dev)
1774                 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
1775         rcu_read_unlock();
1776         *uaddr_len = sizeof(*uaddr);
1777 
1778         return 0;
1779 }
1780 
1781 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1782                           int *uaddr_len, int peer)
1783 {
1784         struct net_device *dev;
1785         struct sock *sk = sock->sk;
1786         struct packet_sock *po = pkt_sk(sk);
1787         DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
1788 
1789         if (peer)
1790                 return -EOPNOTSUPP;
1791 
1792         sll->sll_family = AF_PACKET;
1793         sll->sll_ifindex = po->ifindex;
1794         sll->sll_protocol = po->num;
1795         sll->sll_pkttype = 0;
1796         rcu_read_lock();
1797         dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
1798         if (dev) {
1799                 sll->sll_hatype = dev->type;
1800                 sll->sll_halen = dev->addr_len;
1801                 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1802         } else {
1803                 sll->sll_hatype = 0;    /* Bad: we have no ARPHRD_UNSPEC */
1804                 sll->sll_halen = 0;
1805         }
1806         rcu_read_unlock();
1807         *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1808 
1809         return 0;
1810 }
1811 
1812 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1813                          int what)
1814 {
1815         switch (i->type) {
1816         case PACKET_MR_MULTICAST:
1817                 if (i->alen != dev->addr_len)
1818                         return -EINVAL;
1819                 if (what > 0)
1820                         return dev_mc_add(dev, i->addr);
1821                 else
1822                         return dev_mc_del(dev, i->addr);
1823                 break;
1824         case PACKET_MR_PROMISC:
1825                 return dev_set_promiscuity(dev, what);
1826                 break;
1827         case PACKET_MR_ALLMULTI:
1828                 return dev_set_allmulti(dev, what);
1829                 break;
1830         case PACKET_MR_UNICAST:
1831                 if (i->alen != dev->addr_len)
1832                         return -EINVAL;
1833                 if (what > 0)
1834                         return dev_uc_add(dev, i->addr);
1835                 else
1836                         return dev_uc_del(dev, i->addr);
1837                 break;
1838         default:
1839                 break;
1840         }
1841         return 0;
1842 }
1843 
1844 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1845 {
1846         for ( ; i; i = i->next) {
1847                 if (i->ifindex == dev->ifindex)
1848                         packet_dev_mc(dev, i, what);
1849         }
1850 }
1851 
1852 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1853 {
1854         struct packet_sock *po = pkt_sk(sk);
1855         struct packet_mclist *ml, *i;
1856         struct net_device *dev;
1857         int err;
1858 
1859         rtnl_lock();
1860 
1861         err = -ENODEV;
1862         dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1863         if (!dev)
1864                 goto done;
1865 
1866         err = -EINVAL;
1867         if (mreq->mr_alen > dev->addr_len)
1868                 goto done;
1869 
1870         err = -ENOBUFS;
1871         i = kmalloc(sizeof(*i), GFP_KERNEL);
1872         if (i == NULL)
1873                 goto done;
1874 
1875         err = 0;
1876         for (ml = po->mclist; ml; ml = ml->next) {
1877                 if (ml->ifindex == mreq->mr_ifindex &&
1878                     ml->type == mreq->mr_type &&
1879                     ml->alen == mreq->mr_alen &&
1880                     memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1881                         ml->count++;
1882                         /* Free the new element ... */
1883                         kfree(i);
1884                         goto done;
1885                 }
1886         }
1887 
1888         i->type = mreq->mr_type;
1889         i->ifindex = mreq->mr_ifindex;
1890         i->alen = mreq->mr_alen;
1891         memcpy(i->addr, mreq->mr_address, i->alen);
1892         i->count = 1;
1893         i->next = po->mclist;
1894         po->mclist = i;
1895         err = packet_dev_mc(dev, i, 1);
1896         if (err) {
1897                 po->mclist = i->next;
1898                 kfree(i);
1899         }
1900 
1901 done:
1902         rtnl_unlock();
1903         return err;
1904 }
1905 
1906 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1907 {
1908         struct packet_mclist *ml, **mlp;
1909 
1910         rtnl_lock();
1911 
1912         for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1913                 if (ml->ifindex == mreq->mr_ifindex &&
1914                     ml->type == mreq->mr_type &&
1915                     ml->alen == mreq->mr_alen &&
1916                     memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1917                         if (--ml->count == 0) {
1918                                 struct net_device *dev;
1919                                 *mlp = ml->next;
1920                                 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1921                                 if (dev)
1922                                         packet_dev_mc(dev, ml, -1);
1923                                 kfree(ml);
1924                         }
1925                         rtnl_unlock();
1926                         return 0;
1927                 }
1928         }
1929         rtnl_unlock();
1930         return -EADDRNOTAVAIL;
1931 }
1932 
1933 static void packet_flush_mclist(struct sock *sk)
1934 {
1935         struct packet_sock *po = pkt_sk(sk);
1936         struct packet_mclist *ml;
1937 
1938         if (!po->mclist)
1939                 return;
1940 
1941         rtnl_lock();
1942         while ((ml = po->mclist) != NULL) {
1943                 struct net_device *dev;
1944 
1945                 po->mclist = ml->next;
1946                 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1947                 if (dev != NULL)
1948                         packet_dev_mc(dev, ml, -1);
1949                 kfree(ml);
1950         }
1951         rtnl_unlock();
1952 }
1953 
1954 static int
1955 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1956 {
1957         struct sock *sk = sock->sk;
1958         struct packet_sock *po = pkt_sk(sk);
1959         int ret;
1960 
1961         if (level != SOL_PACKET)
1962                 return -ENOPROTOOPT;
1963 
1964         switch (optname) {
1965         case PACKET_ADD_MEMBERSHIP:
1966         case PACKET_DROP_MEMBERSHIP:
1967         {
1968                 struct packet_mreq_max mreq;
1969                 int len = optlen;
1970                 memset(&mreq, 0, sizeof(mreq));
1971                 if (len < sizeof(struct packet_mreq))
1972                         return -EINVAL;
1973                 if (len > sizeof(mreq))
1974                         len = sizeof(mreq);
1975                 if (copy_from_user(&mreq, optval, len))
1976                         return -EFAULT;
1977                 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1978                         return -EINVAL;
1979                 if (optname == PACKET_ADD_MEMBERSHIP)
1980                         ret = packet_mc_add(sk, &mreq);
1981                 else
1982                         ret = packet_mc_drop(sk, &mreq);
1983                 return ret;
1984         }
1985 
1986         case PACKET_RX_RING:
1987         case PACKET_TX_RING:
1988         {
1989                 struct tpacket_req req;
1990 
1991                 if (optlen < sizeof(req))
1992                         return -EINVAL;
1993                 if (pkt_sk(sk)->has_vnet_hdr)
1994                         return -EINVAL;
1995                 if (copy_from_user(&req, optval, sizeof(req)))
1996                         return -EFAULT;
1997                 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
1998         }
1999         case PACKET_COPY_THRESH:
2000         {
2001                 int val;
2002 
2003                 if (optlen != sizeof(val))
2004                         return -EINVAL;
2005                 if (copy_from_user(&val, optval, sizeof(val)))
2006                         return -EFAULT;
2007 
2008                 pkt_sk(sk)->copy_thresh = val;
2009                 return 0;
2010         }
2011         case PACKET_VERSION:
2012         {
2013                 int val;
2014 
2015                 if (optlen != sizeof(val))
2016                         return -EINVAL;
2017                 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2018                         return -EBUSY;
2019                 if (copy_from_user(&val, optval, sizeof(val)))
2020                         return -EFAULT;
2021                 switch (val) {
2022                 case TPACKET_V1:
2023                 case TPACKET_V2:
2024                         po->tp_version = val;
2025                         return 0;
2026                 default:
2027                         return -EINVAL;
2028                 }
2029         }
2030         case PACKET_RESERVE:
2031         {
2032                 unsigned int val;
2033 
2034                 if (optlen != sizeof(val))
2035                         return -EINVAL;
2036                 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2037                         return -EBUSY;
2038                 if (copy_from_user(&val, optval, sizeof(val)))
2039                         return -EFAULT;
2040                 po->tp_reserve = val;
2041                 return 0;
2042         }
2043         case PACKET_LOSS:
2044         {
2045                 unsigned int val;
2046 
2047                 if (optlen != sizeof(val))
2048                         return -EINVAL;
2049                 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2050                         return -EBUSY;
2051                 if (copy_from_user(&val, optval, sizeof(val)))
2052                         return -EFAULT;
2053                 po->tp_loss = !!val;
2054                 return 0;
2055         }
2056         case PACKET_AUXDATA:
2057         {
2058                 int val;
2059 
2060                 if (optlen < sizeof(val))
2061                         return -EINVAL;
2062                 if (copy_from_user(&val, optval, sizeof(val)))
2063                         return -EFAULT;
2064 
2065                 po->auxdata = !!val;
2066                 return 0;
2067         }
2068         case PACKET_ORIGDEV:
2069         {
2070                 int val;
2071 
2072                 if (optlen < sizeof(val))
2073                         return -EINVAL;
2074                 if (copy_from_user(&val, optval, sizeof(val)))
2075                         return -EFAULT;
2076 
2077                 po->origdev = !!val;
2078                 return 0;
2079         }
2080         case PACKET_VNET_HDR:
2081         {
2082                 int val;
2083 
2084                 if (sock->type != SOCK_RAW)
2085                         return -EINVAL;
2086                 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2087                         return -EBUSY;
2088                 if (optlen < sizeof(val))
2089                         return -EINVAL;
2090                 if (copy_from_user(&val, optval, sizeof(val)))
2091                         return -EFAULT;
2092 
2093                 po->has_vnet_hdr = !!val;
2094                 return 0;
2095         }
2096         case PACKET_TIMESTAMP:
2097         {
2098                 int val;
2099 
2100                 if (optlen != sizeof(val))
2101                         return -EINVAL;
2102                 if (copy_from_user(&val, optval, sizeof(val)))
2103                         return -EFAULT;
2104 
2105                 po->tp_tstamp = val;
2106                 return 0;
2107         }
2108         default:
2109                 return -ENOPROTOOPT;
2110         }
2111 }
2112 
2113 static int packet_getsockopt(struct socket *sock, int level, int optname,
2114                              char __user *optval, int __user *optlen)
2115 {
2116         int len;
2117         int val;
2118         struct sock *sk = sock->sk;
2119         struct packet_sock *po = pkt_sk(sk);
2120         void *data;
2121         struct tpacket_stats st;
2122 
2123         if (level != SOL_PACKET)
2124                 return -ENOPROTOOPT;
2125 
2126         if (get_user(len, optlen))
2127                 return -EFAULT;
2128 
2129         if (len < 0)
2130                 return -EINVAL;
2131 
2132         switch (optname) {
2133         case PACKET_STATISTICS:
2134                 if (len > sizeof(struct tpacket_stats))
2135                         len = sizeof(struct tpacket_stats);
2136                 spin_lock_bh(&sk->sk_receive_queue.lock);
2137                 st = po->stats;
2138                 memset(&po->stats, 0, sizeof(st));
2139                 spin_unlock_bh(&sk->sk_receive_queue.lock);
2140                 st.tp_packets += st.tp_drops;
2141 
2142                 data = &st;
2143                 break;
2144         case PACKET_AUXDATA:
2145                 if (len > sizeof(int))
2146                         len = sizeof(int);
2147                 val = po->auxdata;
2148 
2149                 data = &val;
2150                 break;
2151         case PACKET_ORIGDEV:
2152                 if (len > sizeof(int))
2153                         len = sizeof(int);
2154                 val = po->origdev;
2155 
2156                 data = &val;
2157                 break;
2158         case PACKET_VNET_HDR:
2159                 if (len > sizeof(int))
2160                         len = sizeof(int);
2161                 val = po->has_vnet_hdr;
2162 
2163                 data = &val;
2164                 break;
2165         case PACKET_VERSION:
2166                 if (len > sizeof(int))
2167                         len = sizeof(int);
2168                 val = po->tp_version;
2169                 data = &val;
2170                 break;
2171         case PACKET_HDRLEN:
2172                 if (len > sizeof(int))
2173                         len = sizeof(int);
2174                 if (copy_from_user(&val, optval, len))
2175                         return -EFAULT;
2176                 switch (val) {
2177                 case TPACKET_V1:
2178                         val = sizeof(struct tpacket_hdr);
2179                         break;
2180                 case TPACKET_V2:
2181                         val = sizeof(struct tpacket2_hdr);
2182                         break;
2183                 default:
2184                         return -EINVAL;
2185                 }
2186                 data = &val;
2187                 break;
2188         case PACKET_RESERVE:
2189                 if (len > sizeof(unsigned int))
2190                         len = sizeof(unsigned int);
2191                 val = po->tp_reserve;
2192                 data = &val;
2193                 break;
2194         case PACKET_LOSS:
2195                 if (len > sizeof(unsigned int))
2196                         len = sizeof(unsigned int);
2197                 val = po->tp_loss;
2198                 data = &val;
2199                 break;
2200         case PACKET_TIMESTAMP:
2201                 if (len > sizeof(int))
2202                         len = sizeof(int);
2203                 val = po->tp_tstamp;
2204                 data = &val;
2205                 break;
2206         default:
2207                 return -ENOPROTOOPT;
2208         }
2209 
2210         if (put_user(len, optlen))
2211                 return -EFAULT;
2212         if (copy_to_user(optval, data, len))
2213                 return -EFAULT;
2214         return 0;
2215 }
2216 
2217 
2218 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
2219 {
2220         struct sock *sk;
2221         struct hlist_node *node;
2222         struct net_device *dev = data;
2223         struct net *net = dev_net(dev);
2224 
2225         rcu_read_lock();
2226         sk_for_each_rcu(sk, node, &net->packet.sklist) {
2227                 struct packet_sock *po = pkt_sk(sk);
2228 
2229                 switch (msg) {
2230                 case NETDEV_UNREGISTER:
2231                         if (po->mclist)
2232                                 packet_dev_mclist(dev, po->mclist, -1);
2233                         /* fallthrough */
2234 
2235                 case NETDEV_DOWN:
2236                         if (dev->ifindex == po->ifindex) {
2237                                 spin_lock(&po->bind_lock);
2238                                 if (po->running) {
2239                                         __dev_remove_pack(&po->prot_hook);
2240                                         __sock_put(sk);
2241                                         po->running = 0;
2242                                         sk->sk_err = ENETDOWN;
2243                                         if (!sock_flag(sk, SOCK_DEAD))
2244                                                 sk->sk_error_report(sk);
2245                                 }
2246                                 if (msg == NETDEV_UNREGISTER) {
2247                                         po->ifindex = -1;
2248                                         po->prot_hook.dev = NULL;
2249                                 }
2250                                 spin_unlock(&po->bind_lock);
2251                         }
2252                         break;
2253                 case NETDEV_UP:
2254                         if (dev->ifindex == po->ifindex) {
2255                                 spin_lock(&po->bind_lock);
2256                                 if (po->num && !po->running) {
2257                                         dev_add_pack(&po->prot_hook);
2258                                         sock_hold(sk);
2259                                         po->running = 1;
2260                                 }
2261                                 spin_unlock(&po->bind_lock);
2262                         }
2263                         break;
2264                 }
2265         }
2266         rcu_read_unlock();
2267         return NOTIFY_DONE;
2268 }
2269 
2270 
2271 static int packet_ioctl(struct socket *sock, unsigned int cmd,
2272                         unsigned long arg)
2273 {
2274         struct sock *sk = sock->sk;
2275 
2276         switch (cmd) {
2277         case SIOCOUTQ:
2278         {
2279                 int amount = sk_wmem_alloc_get(sk);
2280 
2281                 return put_user(amount, (int __user *)arg);
2282         }
2283         case SIOCINQ:
2284         {
2285                 struct sk_buff *skb;
2286                 int amount = 0;
2287 
2288                 spin_lock_bh(&sk->sk_receive_queue.lock);
2289                 skb = skb_peek(&sk->sk_receive_queue);
2290                 if (skb)
2291                         amount = skb->len;
2292                 spin_unlock_bh(&sk->sk_receive_queue.lock);
2293                 return put_user(amount, (int __user *)arg);
2294         }
2295         case SIOCGSTAMP:
2296                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2297         case SIOCGSTAMPNS:
2298                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
2299 
2300 #ifdef CONFIG_INET
2301         case SIOCADDRT:
2302         case SIOCDELRT:
2303         case SIOCDARP:
2304         case SIOCGARP:
2305         case SIOCSARP:
2306         case SIOCGIFADDR:
2307         case SIOCSIFADDR:
2308         case SIOCGIFBRDADDR:
2309         case SIOCSIFBRDADDR:
2310         case SIOCGIFNETMASK:
2311         case SIOCSIFNETMASK:
2312         case SIOCGIFDSTADDR:
2313         case SIOCSIFDSTADDR:
2314         case SIOCSIFFLAGS:
2315                 return inet_dgram_ops.ioctl(sock, cmd, arg);
2316 #endif
2317 
2318         default:
2319                 return -ENOIOCTLCMD;
2320         }
2321         return 0;
2322 }
2323 
2324 static unsigned int packet_poll(struct file *file, struct socket *sock,
2325                                 poll_table *wait)
2326 {
2327         struct sock *sk = sock->sk;
2328         struct packet_sock *po = pkt_sk(sk);
2329         unsigned int mask = datagram_poll(file, sock, wait);
2330 
2331         spin_lock_bh(&sk->sk_receive_queue.lock);
2332         if (po->rx_ring.pg_vec) {
2333                 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
2334                         mask |= POLLIN | POLLRDNORM;
2335         }
2336         spin_unlock_bh(&sk->sk_receive_queue.lock);
2337         spin_lock_bh(&sk->sk_write_queue.lock);
2338         if (po->tx_ring.pg_vec) {
2339                 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2340                         mask |= POLLOUT | POLLWRNORM;
2341         }
2342         spin_unlock_bh(&sk->sk_write_queue.lock);
2343         return mask;
2344 }
2345 
2346 
2347 /* Dirty? Well, I still did not learn better way to account
2348  * for user mmaps.
2349  */
2350 
2351 static void packet_mm_open(struct vm_area_struct *vma)
2352 {
2353         struct file *file = vma->vm_file;
2354         struct socket *sock = file->private_data;
2355         struct sock *sk = sock->sk;
2356 
2357         if (sk)
2358                 atomic_inc(&pkt_sk(sk)->mapped);
2359 }
2360 
2361 static void packet_mm_close(struct vm_area_struct *vma)
2362 {
2363         struct file *file = vma->vm_file;
2364         struct socket *sock = file->private_data;
2365         struct sock *sk = sock->sk;
2366 
2367         if (sk)
2368                 atomic_dec(&pkt_sk(sk)->mapped);
2369 }
2370 
2371 static const struct vm_operations_struct packet_mmap_ops = {
2372         .open   =       packet_mm_open,
2373         .close  =       packet_mm_close,
2374 };
2375 
2376 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
2377                         unsigned int len)
2378 {
2379         int i;
2380 
2381         for (i = 0; i < len; i++) {
2382                 if (likely(pg_vec[i].buffer)) {
2383                         if (is_vmalloc_addr(pg_vec[i].buffer))
2384                                 vfree(pg_vec[i].buffer);
2385                         else
2386                                 free_pages((unsigned long)pg_vec[i].buffer,
2387                                            order);
2388                         pg_vec[i].buffer = NULL;
2389                 }
2390         }
2391         kfree(pg_vec);
2392 }
2393 
2394 static inline char *alloc_one_pg_vec_page(unsigned long order)
2395 {
2396         char *buffer = NULL;
2397         gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
2398                           __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
2399 
2400         buffer = (char *) __get_free_pages(gfp_flags, order);
2401 
2402         if (buffer)
2403                 return buffer;
2404 
2405         /*
2406          * __get_free_pages failed, fall back to vmalloc
2407          */
2408         buffer = vzalloc((1 << order) * PAGE_SIZE);
2409 
2410         if (buffer)
2411                 return buffer;
2412 
2413         /*
2414          * vmalloc failed, lets dig into swap here
2415          */
2416         gfp_flags &= ~__GFP_NORETRY;
2417         buffer = (char *)__get_free_pages(gfp_flags, order);
2418         if (buffer)
2419                 return buffer;
2420 
2421         /*
2422          * complete and utter failure
2423          */
2424         return NULL;
2425 }
2426 
2427 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
2428 {
2429         unsigned int block_nr = req->tp_block_nr;
2430         struct pgv *pg_vec;
2431         int i;
2432 
2433         pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
2434         if (unlikely(!pg_vec))
2435                 goto out;
2436 
2437         for (i = 0; i < block_nr; i++) {
2438                 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
2439                 if (unlikely(!pg_vec[i].buffer))
2440                         goto out_free_pgvec;
2441         }
2442 
2443 out:
2444         return pg_vec;
2445 
2446 out_free_pgvec:
2447         free_pg_vec(pg_vec, order, block_nr);
2448         pg_vec = NULL;
2449         goto out;
2450 }
2451 
2452 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2453                 int closing, int tx_ring)
2454 {
2455         struct pgv *pg_vec = NULL;
2456         struct packet_sock *po = pkt_sk(sk);
2457         int was_running, order = 0;
2458         struct packet_ring_buffer *rb;
2459         struct sk_buff_head *rb_queue;
2460         __be16 num;
2461         int err;
2462 
2463         rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2464         rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2465 
2466         err = -EBUSY;
2467         if (!closing) {
2468                 if (atomic_read(&po->mapped))
2469                         goto out;
2470                 if (atomic_read(&rb->pending))
2471                         goto out;
2472         }
2473 
2474         if (req->tp_block_nr) {
2475                 /* Sanity tests and some calculations */
2476                 err = -EBUSY;
2477                 if (unlikely(rb->pg_vec))
2478                         goto out;
2479 
2480                 switch (po->tp_version) {
2481                 case TPACKET_V1:
2482                         po->tp_hdrlen = TPACKET_HDRLEN;
2483                         break;
2484                 case TPACKET_V2:
2485                         po->tp_hdrlen = TPACKET2_HDRLEN;
2486                         break;
2487                 }
2488 
2489                 err = -EINVAL;
2490                 if (unlikely((int)req->tp_block_size <= 0))
2491                         goto out;
2492                 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
2493                         goto out;
2494                 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
2495                                         po->tp_reserve))
2496                         goto out;
2497                 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
2498                         goto out;
2499 
2500                 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2501                 if (unlikely(rb->frames_per_block <= 0))
2502                         goto out;
2503                 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2504                                         req->tp_frame_nr))
2505                         goto out;
2506 
2507                 err = -ENOMEM;
2508                 order = get_order(req->tp_block_size);
2509                 pg_vec = alloc_pg_vec(req, order);
2510                 if (unlikely(!pg_vec))
2511                         goto out;
2512         }
2513         /* Done */
2514         else {
2515                 err = -EINVAL;
2516                 if (unlikely(req->tp_frame_nr))
2517                         goto out;
2518         }
2519 
2520         lock_sock(sk);
2521 
2522         /* Detach socket from network */
2523         spin_lock(&po->bind_lock);
2524         was_running = po->running;
2525         num = po->num;
2526         if (was_running) {
2527                 __dev_remove_pack(&po->prot_hook);
2528                 po->num = 0;
2529                 po->running = 0;
2530                 __sock_put(sk);
2531         }
2532         spin_unlock(&po->bind_lock);
2533 
2534         synchronize_net();
2535 
2536         err = -EBUSY;
2537         mutex_lock(&po->pg_vec_lock);
2538         if (closing || atomic_read(&po->mapped) == 0) {
2539                 err = 0;
2540                 spin_lock_bh(&rb_queue->lock);
2541                 swap(rb->pg_vec, pg_vec);
2542                 rb->frame_max = (req->tp_frame_nr - 1);
2543                 rb->head = 0;
2544                 rb->frame_size = req->tp_frame_size;
2545                 spin_unlock_bh(&rb_queue->lock);
2546 
2547                 swap(rb->pg_vec_order, order);
2548                 swap(rb->pg_vec_len, req->tp_block_nr);
2549 
2550                 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2551                 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2552                                                 tpacket_rcv : packet_rcv;
2553                 skb_queue_purge(rb_queue);
2554                 if (atomic_read(&po->mapped))
2555                         pr_err("packet_mmap: vma is busy: %d\n",
2556                                atomic_read(&po->mapped));
2557         }
2558         mutex_unlock(&po->pg_vec_lock);
2559 
2560         spin_lock(&po->bind_lock);
2561         if (was_running && !po->running) {
2562                 sock_hold(sk);
2563                 po->running = 1;
2564                 po->num = num;
2565                 dev_add_pack(&po->prot_hook);
2566         }
2567         spin_unlock(&po->bind_lock);
2568 
2569         release_sock(sk);
2570 
2571         if (pg_vec)
2572                 free_pg_vec(pg_vec, order, req->tp_block_nr);
2573 out:
2574         return err;
2575 }
2576 
2577 static int packet_mmap(struct file *file, struct socket *sock,
2578                 struct vm_area_struct *vma)
2579 {
2580         struct sock *sk = sock->sk;
2581         struct packet_sock *po = pkt_sk(sk);
2582         unsigned long size, expected_size;
2583         struct packet_ring_buffer *rb;
2584         unsigned long start;
2585         int err = -EINVAL;
2586         int i;
2587 
2588         if (vma->vm_pgoff)
2589                 return -EINVAL;
2590 
2591         mutex_lock(&po->pg_vec_lock);
2592 
2593         expected_size = 0;
2594         for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2595                 if (rb->pg_vec) {
2596                         expected_size += rb->pg_vec_len
2597                                                 * rb->pg_vec_pages
2598                                                 * PAGE_SIZE;
2599                 }
2600         }
2601 
2602         if (expected_size == 0)
2603                 goto out;
2604 
2605         size = vma->vm_end - vma->vm_start;
2606         if (size != expected_size)
2607                 goto out;
2608 
2609         start = vma->vm_start;
2610         for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2611                 if (rb->pg_vec == NULL)
2612                         continue;
2613 
2614                 for (i = 0; i < rb->pg_vec_len; i++) {
2615                         struct page *page;
2616                         void *kaddr = rb->pg_vec[i].buffer;
2617                         int pg_num;
2618 
2619                         for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
2620                                 page = pgv_to_page(kaddr);
2621                                 err = vm_insert_page(vma, start, page);
2622                                 if (unlikely(err))
2623                                         goto out;
2624                                 start += PAGE_SIZE;
2625                                 kaddr += PAGE_SIZE;
2626                         }
2627                 }
2628         }
2629 
2630         atomic_inc(&po->mapped);
2631         vma->vm_ops = &packet_mmap_ops;
2632         err = 0;
2633 
2634 out:
2635         mutex_unlock(&po->pg_vec_lock);
2636         return err;
2637 }
2638 
2639 static const struct proto_ops packet_ops_spkt = {
2640         .family =       PF_PACKET,
2641         .owner =        THIS_MODULE,
2642         .release =      packet_release,
2643         .bind =         packet_bind_spkt,
2644         .connect =      sock_no_connect,
2645         .socketpair =   sock_no_socketpair,
2646         .accept =       sock_no_accept,
2647         .getname =      packet_getname_spkt,
2648         .poll =         datagram_poll,
2649         .ioctl =        packet_ioctl,
2650         .listen =       sock_no_listen,
2651         .shutdown =     sock_no_shutdown,
2652         .setsockopt =   sock_no_setsockopt,
2653         .getsockopt =   sock_no_getsockopt,
2654         .sendmsg =      packet_sendmsg_spkt,
2655         .recvmsg =      packet_recvmsg,
2656         .mmap =         sock_no_mmap,
2657         .sendpage =     sock_no_sendpage,
2658 };
2659 
2660 static const struct proto_ops packet_ops = {
2661         .family =       PF_PACKET,
2662         .owner =        THIS_MODULE,
2663         .release =      packet_release,
2664         .bind =         packet_bind,
2665         .connect =      sock_no_connect,
2666         .socketpair =   sock_no_socketpair,
2667         .accept =       sock_no_accept,
2668         .getname =      packet_getname,
2669         .poll =         packet_poll,
2670         .ioctl =        packet_ioctl,
2671         .listen =       sock_no_listen,
2672         .shutdown =     sock_no_shutdown,
2673         .setsockopt =   packet_setsockopt,
2674         .getsockopt =   packet_getsockopt,
2675         .sendmsg =      packet_sendmsg,
2676         .recvmsg =      packet_recvmsg,
2677         .mmap =         packet_mmap,
2678         .sendpage =     sock_no_sendpage,
2679 };
2680 
2681 static const struct net_proto_family packet_family_ops = {
2682         .family =       PF_PACKET,
2683         .create =       packet_create,
2684         .owner  =       THIS_MODULE,
2685 };
2686 
2687 static struct notifier_block packet_netdev_notifier = {
2688         .notifier_call =        packet_notifier,
2689 };
2690 
2691 #ifdef CONFIG_PROC_FS
2692 
2693 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2694         __acquires(RCU)
2695 {
2696         struct net *net = seq_file_net(seq);
2697 
2698         rcu_read_lock();
2699         return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
2700 }
2701 
2702 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2703 {
2704         struct net *net = seq_file_net(seq);
2705         return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
2706 }
2707 
2708 static void packet_seq_stop(struct seq_file *seq, void *v)
2709         __releases(RCU)
2710 {
2711         rcu_read_unlock();
2712 }
2713 
2714 static int packet_seq_show(struct seq_file *seq, void *v)
2715 {
2716         if (v == SEQ_START_TOKEN)
2717                 seq_puts(seq, "sk       RefCnt Type Proto  Iface R Rmem   User   Inode\n");
2718         else {
2719                 struct sock *s = sk_entry(v);
2720                 const struct packet_sock *po = pkt_sk(s);
2721 
2722                 seq_printf(seq,
2723                            "%pK %-6d %-4d %04x   %-5d %1d %-6u %-6u %-6lu\n",
2724                            s,
2725                            atomic_read(&s->sk_refcnt),
2726                            s->sk_type,
2727                            ntohs(po->num),
2728                            po->ifindex,
2729                            po->running,
2730                            atomic_read(&s->sk_rmem_alloc),
2731                            sock_i_uid(s),
2732                            sock_i_ino(s));
2733         }
2734 
2735         return 0;
2736 }
2737 
2738 static const struct seq_operations packet_seq_ops = {
2739         .start  = packet_seq_start,
2740         .next   = packet_seq_next,
2741         .stop   = packet_seq_stop,
2742         .show   = packet_seq_show,
2743 };
2744 
2745 static int packet_seq_open(struct inode *inode, struct file *file)
2746 {
2747         return seq_open_net(inode, file, &packet_seq_ops,
2748                             sizeof(struct seq_net_private));
2749 }
2750 
2751 static const struct file_operations packet_seq_fops = {
2752         .owner          = THIS_MODULE,
2753         .open           = packet_seq_open,
2754         .read           = seq_read,
2755         .llseek         = seq_lseek,
2756         .release        = seq_release_net,
2757 };
2758 
2759 #endif
2760 
2761 static int __net_init packet_net_init(struct net *net)
2762 {
2763         spin_lock_init(&net->packet.sklist_lock);
2764         INIT_HLIST_HEAD(&net->packet.sklist);
2765 
2766         if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2767                 return -ENOMEM;
2768 
2769         return 0;
2770 }
2771 
2772 static void __net_exit packet_net_exit(struct net *net)
2773 {
2774         proc_net_remove(net, "packet");
2775 }
2776 
2777 static struct pernet_operations packet_net_ops = {
2778         .init = packet_net_init,
2779         .exit = packet_net_exit,
2780 };
2781 
2782 
2783 static void __exit packet_exit(void)
2784 {
2785         unregister_netdevice_notifier(&packet_netdev_notifier);
2786         unregister_pernet_subsys(&packet_net_ops);
2787         sock_unregister(PF_PACKET);
2788         proto_unregister(&packet_proto);
2789 }
2790 
2791 static int __init packet_init(void)
2792 {
2793         int rc = proto_register(&packet_proto, 0);
2794 
2795         if (rc != 0)
2796                 goto out;
2797 
2798         sock_register(&packet_family_ops);
2799         register_pernet_subsys(&packet_net_ops);
2800         register_netdevice_notifier(&packet_netdev_notifier);
2801 out:
2802         return rc;
2803 }
2804 
2805 module_init(packet_init);
2806 module_exit(packet_exit);
2807 MODULE_LICENSE("GPL");
2808 MODULE_ALIAS_NETPROTO(PF_PACKET);
2809 

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