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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[mirror_ubuntu-zesty-kernel.git] / net / packet / af_packet.c
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 <net/net_namespace.h>
64 #include <net/ip.h>
65 #include <net/protocol.h>
66 #include <linux/skbuff.h>
67 #include <net/sock.h>
68 #include <linux/errno.h>
69 #include <linux/timer.h>
70 #include <asm/system.h>
71 #include <asm/uaccess.h>
72 #include <asm/ioctls.h>
73 #include <asm/page.h>
74 #include <asm/cacheflush.h>
75 #include <asm/io.h>
76 #include <linux/proc_fs.h>
77 #include <linux/seq_file.h>
78 #include <linux/poll.h>
79 #include <linux/module.h>
80 #include <linux/init.h>
81 #include <linux/mutex.h>
82
83 #ifdef CONFIG_INET
84 #include <net/inet_common.h>
85 #endif
86
87 /*
88 Assumptions:
89 - if device has no dev->hard_header routine, it adds and removes ll header
90 inside itself. In this case ll header is invisible outside of device,
91 but higher levels still should reserve dev->hard_header_len.
92 Some devices are enough clever to reallocate skb, when header
93 will not fit to reserved space (tunnel), another ones are silly
94 (PPP).
95 - packet socket receives packets with pulled ll header,
96 so that SOCK_RAW should push it back.
97
98 On receive:
99 -----------
100
101 Incoming, dev->hard_header!=NULL
102 mac_header -> ll header
103 data -> data
104
105 Outgoing, dev->hard_header!=NULL
106 mac_header -> ll header
107 data -> ll header
108
109 Incoming, dev->hard_header==NULL
110 mac_header -> UNKNOWN position. It is very likely, that it points to ll
111 header. PPP makes it, that is wrong, because introduce
112 assymetry between rx and tx paths.
113 data -> data
114
115 Outgoing, dev->hard_header==NULL
116 mac_header -> data. ll header is still not built!
117 data -> data
118
119 Resume
120 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
121
122
123 On transmit:
124 ------------
125
126 dev->hard_header != NULL
127 mac_header -> ll header
128 data -> ll header
129
130 dev->hard_header == NULL (ll header is added by device, we cannot control it)
131 mac_header -> data
132 data -> data
133
134 We should set nh.raw on output to correct posistion,
135 packet classifier depends on it.
136 */
137
138 /* Private packet socket structures. */
139
140 struct packet_mclist {
141 struct packet_mclist *next;
142 int ifindex;
143 int count;
144 unsigned short type;
145 unsigned short alen;
146 unsigned char addr[MAX_ADDR_LEN];
147 };
148 /* identical to struct packet_mreq except it has
149 * a longer address field.
150 */
151 struct packet_mreq_max {
152 int mr_ifindex;
153 unsigned short mr_type;
154 unsigned short mr_alen;
155 unsigned char mr_address[MAX_ADDR_LEN];
156 };
157
158 #ifdef CONFIG_PACKET_MMAP
159 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
160 int closing, int tx_ring);
161
162 struct packet_ring_buffer {
163 char **pg_vec;
164 unsigned int head;
165 unsigned int frames_per_block;
166 unsigned int frame_size;
167 unsigned int frame_max;
168
169 unsigned int pg_vec_order;
170 unsigned int pg_vec_pages;
171 unsigned int pg_vec_len;
172
173 atomic_t pending;
174 };
175
176 struct packet_sock;
177 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
178 #endif
179
180 static void packet_flush_mclist(struct sock *sk);
181
182 struct packet_sock {
183 /* struct sock has to be the first member of packet_sock */
184 struct sock sk;
185 struct tpacket_stats stats;
186 #ifdef CONFIG_PACKET_MMAP
187 struct packet_ring_buffer rx_ring;
188 struct packet_ring_buffer tx_ring;
189 int copy_thresh;
190 #endif
191 struct packet_type prot_hook;
192 spinlock_t bind_lock;
193 struct mutex pg_vec_lock;
194 unsigned int running:1, /* prot_hook is attached*/
195 auxdata:1,
196 origdev:1;
197 int ifindex; /* bound device */
198 __be16 num;
199 struct packet_mclist *mclist;
200 #ifdef CONFIG_PACKET_MMAP
201 atomic_t mapped;
202 enum tpacket_versions tp_version;
203 unsigned int tp_hdrlen;
204 unsigned int tp_reserve;
205 unsigned int tp_loss:1;
206 #endif
207 };
208
209 struct packet_skb_cb {
210 unsigned int origlen;
211 union {
212 struct sockaddr_pkt pkt;
213 struct sockaddr_ll ll;
214 } sa;
215 };
216
217 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
218
219 #ifdef CONFIG_PACKET_MMAP
220
221 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
222 {
223 union {
224 struct tpacket_hdr *h1;
225 struct tpacket2_hdr *h2;
226 void *raw;
227 } h;
228
229 h.raw = frame;
230 switch (po->tp_version) {
231 case TPACKET_V1:
232 h.h1->tp_status = status;
233 flush_dcache_page(virt_to_page(&h.h1->tp_status));
234 break;
235 case TPACKET_V2:
236 h.h2->tp_status = status;
237 flush_dcache_page(virt_to_page(&h.h2->tp_status));
238 break;
239 default:
240 pr_err("TPACKET version not supported\n");
241 BUG();
242 }
243
244 smp_wmb();
245 }
246
247 static int __packet_get_status(struct packet_sock *po, void *frame)
248 {
249 union {
250 struct tpacket_hdr *h1;
251 struct tpacket2_hdr *h2;
252 void *raw;
253 } h;
254
255 smp_rmb();
256
257 h.raw = frame;
258 switch (po->tp_version) {
259 case TPACKET_V1:
260 flush_dcache_page(virt_to_page(&h.h1->tp_status));
261 return h.h1->tp_status;
262 case TPACKET_V2:
263 flush_dcache_page(virt_to_page(&h.h2->tp_status));
264 return h.h2->tp_status;
265 default:
266 pr_err("TPACKET version not supported\n");
267 BUG();
268 return 0;
269 }
270 }
271
272 static void *packet_lookup_frame(struct packet_sock *po,
273 struct packet_ring_buffer *rb,
274 unsigned int position,
275 int status)
276 {
277 unsigned int pg_vec_pos, frame_offset;
278 union {
279 struct tpacket_hdr *h1;
280 struct tpacket2_hdr *h2;
281 void *raw;
282 } h;
283
284 pg_vec_pos = position / rb->frames_per_block;
285 frame_offset = position % rb->frames_per_block;
286
287 h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size);
288
289 if (status != __packet_get_status(po, h.raw))
290 return NULL;
291
292 return h.raw;
293 }
294
295 static inline void *packet_current_frame(struct packet_sock *po,
296 struct packet_ring_buffer *rb,
297 int status)
298 {
299 return packet_lookup_frame(po, rb, rb->head, status);
300 }
301
302 static inline void *packet_previous_frame(struct packet_sock *po,
303 struct packet_ring_buffer *rb,
304 int status)
305 {
306 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
307 return packet_lookup_frame(po, rb, previous, status);
308 }
309
310 static inline void packet_increment_head(struct packet_ring_buffer *buff)
311 {
312 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
313 }
314
315 #endif
316
317 static inline struct packet_sock *pkt_sk(struct sock *sk)
318 {
319 return (struct packet_sock *)sk;
320 }
321
322 static void packet_sock_destruct(struct sock *sk)
323 {
324 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
325 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
326
327 if (!sock_flag(sk, SOCK_DEAD)) {
328 pr_err("Attempt to release alive packet socket: %p\n", sk);
329 return;
330 }
331
332 sk_refcnt_debug_dec(sk);
333 }
334
335
336 static const struct proto_ops packet_ops;
337
338 static const struct proto_ops packet_ops_spkt;
339
340 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
341 struct packet_type *pt, struct net_device *orig_dev)
342 {
343 struct sock *sk;
344 struct sockaddr_pkt *spkt;
345
346 /*
347 * When we registered the protocol we saved the socket in the data
348 * field for just this event.
349 */
350
351 sk = pt->af_packet_priv;
352
353 /*
354 * Yank back the headers [hope the device set this
355 * right or kerboom...]
356 *
357 * Incoming packets have ll header pulled,
358 * push it back.
359 *
360 * For outgoing ones skb->data == skb_mac_header(skb)
361 * so that this procedure is noop.
362 */
363
364 if (skb->pkt_type == PACKET_LOOPBACK)
365 goto out;
366
367 if (dev_net(dev) != sock_net(sk))
368 goto out;
369
370 skb = skb_share_check(skb, GFP_ATOMIC);
371 if (skb == NULL)
372 goto oom;
373
374 /* drop any routing info */
375 skb_dst_drop(skb);
376
377 /* drop conntrack reference */
378 nf_reset(skb);
379
380 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
381
382 skb_push(skb, skb->data - skb_mac_header(skb));
383
384 /*
385 * The SOCK_PACKET socket receives _all_ frames.
386 */
387
388 spkt->spkt_family = dev->type;
389 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
390 spkt->spkt_protocol = skb->protocol;
391
392 /*
393 * Charge the memory to the socket. This is done specifically
394 * to prevent sockets using all the memory up.
395 */
396
397 if (sock_queue_rcv_skb(sk, skb) == 0)
398 return 0;
399
400 out:
401 kfree_skb(skb);
402 oom:
403 return 0;
404 }
405
406
407 /*
408 * Output a raw packet to a device layer. This bypasses all the other
409 * protocol layers and you must therefore supply it with a complete frame
410 */
411
412 static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
413 struct msghdr *msg, size_t len)
414 {
415 struct sock *sk = sock->sk;
416 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
417 struct sk_buff *skb;
418 struct net_device *dev;
419 __be16 proto = 0;
420 int err;
421
422 /*
423 * Get and verify the address.
424 */
425
426 if (saddr) {
427 if (msg->msg_namelen < sizeof(struct sockaddr))
428 return -EINVAL;
429 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
430 proto = saddr->spkt_protocol;
431 } else
432 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
433
434 /*
435 * Find the device first to size check it
436 */
437
438 saddr->spkt_device[13] = 0;
439 dev = dev_get_by_name(sock_net(sk), saddr->spkt_device);
440 err = -ENODEV;
441 if (dev == NULL)
442 goto out_unlock;
443
444 err = -ENETDOWN;
445 if (!(dev->flags & IFF_UP))
446 goto out_unlock;
447
448 /*
449 * You may not queue a frame bigger than the mtu. This is the lowest level
450 * raw protocol and you must do your own fragmentation at this level.
451 */
452
453 err = -EMSGSIZE;
454 if (len > dev->mtu + dev->hard_header_len)
455 goto out_unlock;
456
457 err = -ENOBUFS;
458 skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);
459
460 /*
461 * If the write buffer is full, then tough. At this level the user
462 * gets to deal with the problem - do your own algorithmic backoffs.
463 * That's far more flexible.
464 */
465
466 if (skb == NULL)
467 goto out_unlock;
468
469 /*
470 * Fill it in
471 */
472
473 /* FIXME: Save some space for broken drivers that write a
474 * hard header at transmission time by themselves. PPP is the
475 * notable one here. This should really be fixed at the driver level.
476 */
477 skb_reserve(skb, LL_RESERVED_SPACE(dev));
478 skb_reset_network_header(skb);
479
480 /* Try to align data part correctly */
481 if (dev->header_ops) {
482 skb->data -= dev->hard_header_len;
483 skb->tail -= dev->hard_header_len;
484 if (len < dev->hard_header_len)
485 skb_reset_network_header(skb);
486 }
487
488 /* Returns -EFAULT on error */
489 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
490 skb->protocol = proto;
491 skb->dev = dev;
492 skb->priority = sk->sk_priority;
493 if (err)
494 goto out_free;
495
496 /*
497 * Now send it
498 */
499
500 dev_queue_xmit(skb);
501 dev_put(dev);
502 return len;
503
504 out_free:
505 kfree_skb(skb);
506 out_unlock:
507 if (dev)
508 dev_put(dev);
509 return err;
510 }
511
512 static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
513 unsigned int res)
514 {
515 struct sk_filter *filter;
516
517 rcu_read_lock_bh();
518 filter = rcu_dereference(sk->sk_filter);
519 if (filter != NULL)
520 res = sk_run_filter(skb, filter->insns, filter->len);
521 rcu_read_unlock_bh();
522
523 return res;
524 }
525
526 /*
527 This function makes lazy skb cloning in hope that most of packets
528 are discarded by BPF.
529
530 Note tricky part: we DO mangle shared skb! skb->data, skb->len
531 and skb->cb are mangled. It works because (and until) packets
532 falling here are owned by current CPU. Output packets are cloned
533 by dev_queue_xmit_nit(), input packets are processed by net_bh
534 sequencially, so that if we return skb to original state on exit,
535 we will not harm anyone.
536 */
537
538 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
539 struct packet_type *pt, struct net_device *orig_dev)
540 {
541 struct sock *sk;
542 struct sockaddr_ll *sll;
543 struct packet_sock *po;
544 u8 *skb_head = skb->data;
545 int skb_len = skb->len;
546 unsigned int snaplen, res;
547
548 if (skb->pkt_type == PACKET_LOOPBACK)
549 goto drop;
550
551 sk = pt->af_packet_priv;
552 po = pkt_sk(sk);
553
554 if (dev_net(dev) != sock_net(sk))
555 goto drop;
556
557 skb->dev = dev;
558
559 if (dev->header_ops) {
560 /* The device has an explicit notion of ll header,
561 exported to higher levels.
562
563 Otherwise, the device hides datails of it frame
564 structure, so that corresponding packet head
565 never delivered to user.
566 */
567 if (sk->sk_type != SOCK_DGRAM)
568 skb_push(skb, skb->data - skb_mac_header(skb));
569 else if (skb->pkt_type == PACKET_OUTGOING) {
570 /* Special case: outgoing packets have ll header at head */
571 skb_pull(skb, skb_network_offset(skb));
572 }
573 }
574
575 snaplen = skb->len;
576
577 res = run_filter(skb, sk, snaplen);
578 if (!res)
579 goto drop_n_restore;
580 if (snaplen > res)
581 snaplen = res;
582
583 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
584 (unsigned)sk->sk_rcvbuf)
585 goto drop_n_acct;
586
587 if (skb_shared(skb)) {
588 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
589 if (nskb == NULL)
590 goto drop_n_acct;
591
592 if (skb_head != skb->data) {
593 skb->data = skb_head;
594 skb->len = skb_len;
595 }
596 kfree_skb(skb);
597 skb = nskb;
598 }
599
600 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
601 sizeof(skb->cb));
602
603 sll = &PACKET_SKB_CB(skb)->sa.ll;
604 sll->sll_family = AF_PACKET;
605 sll->sll_hatype = dev->type;
606 sll->sll_protocol = skb->protocol;
607 sll->sll_pkttype = skb->pkt_type;
608 if (unlikely(po->origdev))
609 sll->sll_ifindex = orig_dev->ifindex;
610 else
611 sll->sll_ifindex = dev->ifindex;
612
613 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
614
615 PACKET_SKB_CB(skb)->origlen = skb->len;
616
617 if (pskb_trim(skb, snaplen))
618 goto drop_n_acct;
619
620 skb_set_owner_r(skb, sk);
621 skb->dev = NULL;
622 skb_dst_drop(skb);
623
624 /* drop conntrack reference */
625 nf_reset(skb);
626
627 spin_lock(&sk->sk_receive_queue.lock);
628 po->stats.tp_packets++;
629 __skb_queue_tail(&sk->sk_receive_queue, skb);
630 spin_unlock(&sk->sk_receive_queue.lock);
631 sk->sk_data_ready(sk, skb->len);
632 return 0;
633
634 drop_n_acct:
635 spin_lock(&sk->sk_receive_queue.lock);
636 po->stats.tp_drops++;
637 spin_unlock(&sk->sk_receive_queue.lock);
638
639 drop_n_restore:
640 if (skb_head != skb->data && skb_shared(skb)) {
641 skb->data = skb_head;
642 skb->len = skb_len;
643 }
644 drop:
645 consume_skb(skb);
646 return 0;
647 }
648
649 #ifdef CONFIG_PACKET_MMAP
650 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
651 struct packet_type *pt, struct net_device *orig_dev)
652 {
653 struct sock *sk;
654 struct packet_sock *po;
655 struct sockaddr_ll *sll;
656 union {
657 struct tpacket_hdr *h1;
658 struct tpacket2_hdr *h2;
659 void *raw;
660 } h;
661 u8 *skb_head = skb->data;
662 int skb_len = skb->len;
663 unsigned int snaplen, res;
664 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
665 unsigned short macoff, netoff, hdrlen;
666 struct sk_buff *copy_skb = NULL;
667 struct timeval tv;
668 struct timespec ts;
669
670 if (skb->pkt_type == PACKET_LOOPBACK)
671 goto drop;
672
673 sk = pt->af_packet_priv;
674 po = pkt_sk(sk);
675
676 if (dev_net(dev) != sock_net(sk))
677 goto drop;
678
679 if (dev->header_ops) {
680 if (sk->sk_type != SOCK_DGRAM)
681 skb_push(skb, skb->data - skb_mac_header(skb));
682 else if (skb->pkt_type == PACKET_OUTGOING) {
683 /* Special case: outgoing packets have ll header at head */
684 skb_pull(skb, skb_network_offset(skb));
685 }
686 }
687
688 if (skb->ip_summed == CHECKSUM_PARTIAL)
689 status |= TP_STATUS_CSUMNOTREADY;
690
691 snaplen = skb->len;
692
693 res = run_filter(skb, sk, snaplen);
694 if (!res)
695 goto drop_n_restore;
696 if (snaplen > res)
697 snaplen = res;
698
699 if (sk->sk_type == SOCK_DGRAM) {
700 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
701 po->tp_reserve;
702 } else {
703 unsigned maclen = skb_network_offset(skb);
704 netoff = TPACKET_ALIGN(po->tp_hdrlen +
705 (maclen < 16 ? 16 : maclen)) +
706 po->tp_reserve;
707 macoff = netoff - maclen;
708 }
709
710 if (macoff + snaplen > po->rx_ring.frame_size) {
711 if (po->copy_thresh &&
712 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
713 (unsigned)sk->sk_rcvbuf) {
714 if (skb_shared(skb)) {
715 copy_skb = skb_clone(skb, GFP_ATOMIC);
716 } else {
717 copy_skb = skb_get(skb);
718 skb_head = skb->data;
719 }
720 if (copy_skb)
721 skb_set_owner_r(copy_skb, sk);
722 }
723 snaplen = po->rx_ring.frame_size - macoff;
724 if ((int)snaplen < 0)
725 snaplen = 0;
726 }
727
728 spin_lock(&sk->sk_receive_queue.lock);
729 h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
730 if (!h.raw)
731 goto ring_is_full;
732 packet_increment_head(&po->rx_ring);
733 po->stats.tp_packets++;
734 if (copy_skb) {
735 status |= TP_STATUS_COPY;
736 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
737 }
738 if (!po->stats.tp_drops)
739 status &= ~TP_STATUS_LOSING;
740 spin_unlock(&sk->sk_receive_queue.lock);
741
742 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
743
744 switch (po->tp_version) {
745 case TPACKET_V1:
746 h.h1->tp_len = skb->len;
747 h.h1->tp_snaplen = snaplen;
748 h.h1->tp_mac = macoff;
749 h.h1->tp_net = netoff;
750 if (skb->tstamp.tv64)
751 tv = ktime_to_timeval(skb->tstamp);
752 else
753 do_gettimeofday(&tv);
754 h.h1->tp_sec = tv.tv_sec;
755 h.h1->tp_usec = tv.tv_usec;
756 hdrlen = sizeof(*h.h1);
757 break;
758 case TPACKET_V2:
759 h.h2->tp_len = skb->len;
760 h.h2->tp_snaplen = snaplen;
761 h.h2->tp_mac = macoff;
762 h.h2->tp_net = netoff;
763 if (skb->tstamp.tv64)
764 ts = ktime_to_timespec(skb->tstamp);
765 else
766 getnstimeofday(&ts);
767 h.h2->tp_sec = ts.tv_sec;
768 h.h2->tp_nsec = ts.tv_nsec;
769 h.h2->tp_vlan_tci = skb->vlan_tci;
770 hdrlen = sizeof(*h.h2);
771 break;
772 default:
773 BUG();
774 }
775
776 sll = h.raw + TPACKET_ALIGN(hdrlen);
777 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
778 sll->sll_family = AF_PACKET;
779 sll->sll_hatype = dev->type;
780 sll->sll_protocol = skb->protocol;
781 sll->sll_pkttype = skb->pkt_type;
782 if (unlikely(po->origdev))
783 sll->sll_ifindex = orig_dev->ifindex;
784 else
785 sll->sll_ifindex = dev->ifindex;
786
787 __packet_set_status(po, h.raw, status);
788 smp_mb();
789 {
790 struct page *p_start, *p_end;
791 u8 *h_end = h.raw + macoff + snaplen - 1;
792
793 p_start = virt_to_page(h.raw);
794 p_end = virt_to_page(h_end);
795 while (p_start <= p_end) {
796 flush_dcache_page(p_start);
797 p_start++;
798 }
799 }
800
801 sk->sk_data_ready(sk, 0);
802
803 drop_n_restore:
804 if (skb_head != skb->data && skb_shared(skb)) {
805 skb->data = skb_head;
806 skb->len = skb_len;
807 }
808 drop:
809 kfree_skb(skb);
810 return 0;
811
812 ring_is_full:
813 po->stats.tp_drops++;
814 spin_unlock(&sk->sk_receive_queue.lock);
815
816 sk->sk_data_ready(sk, 0);
817 kfree_skb(copy_skb);
818 goto drop_n_restore;
819 }
820
821 static void tpacket_destruct_skb(struct sk_buff *skb)
822 {
823 struct packet_sock *po = pkt_sk(skb->sk);
824 void *ph;
825
826 BUG_ON(skb == NULL);
827
828 if (likely(po->tx_ring.pg_vec)) {
829 ph = skb_shinfo(skb)->destructor_arg;
830 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
831 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
832 atomic_dec(&po->tx_ring.pending);
833 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
834 }
835
836 sock_wfree(skb);
837 }
838
839 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
840 void *frame, struct net_device *dev, int size_max,
841 __be16 proto, unsigned char *addr)
842 {
843 union {
844 struct tpacket_hdr *h1;
845 struct tpacket2_hdr *h2;
846 void *raw;
847 } ph;
848 int to_write, offset, len, tp_len, nr_frags, len_max;
849 struct socket *sock = po->sk.sk_socket;
850 struct page *page;
851 void *data;
852 int err;
853
854 ph.raw = frame;
855
856 skb->protocol = proto;
857 skb->dev = dev;
858 skb->priority = po->sk.sk_priority;
859 skb_shinfo(skb)->destructor_arg = ph.raw;
860
861 switch (po->tp_version) {
862 case TPACKET_V2:
863 tp_len = ph.h2->tp_len;
864 break;
865 default:
866 tp_len = ph.h1->tp_len;
867 break;
868 }
869 if (unlikely(tp_len > size_max)) {
870 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
871 return -EMSGSIZE;
872 }
873
874 skb_reserve(skb, LL_RESERVED_SPACE(dev));
875 skb_reset_network_header(skb);
876
877 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
878 to_write = tp_len;
879
880 if (sock->type == SOCK_DGRAM) {
881 err = dev_hard_header(skb, dev, ntohs(proto), addr,
882 NULL, tp_len);
883 if (unlikely(err < 0))
884 return -EINVAL;
885 } else if (dev->hard_header_len) {
886 /* net device doesn't like empty head */
887 if (unlikely(tp_len <= dev->hard_header_len)) {
888 pr_err("packet size is too short (%d < %d)\n",
889 tp_len, dev->hard_header_len);
890 return -EINVAL;
891 }
892
893 skb_push(skb, dev->hard_header_len);
894 err = skb_store_bits(skb, 0, data,
895 dev->hard_header_len);
896 if (unlikely(err))
897 return err;
898
899 data += dev->hard_header_len;
900 to_write -= dev->hard_header_len;
901 }
902
903 err = -EFAULT;
904 page = virt_to_page(data);
905 offset = offset_in_page(data);
906 len_max = PAGE_SIZE - offset;
907 len = ((to_write > len_max) ? len_max : to_write);
908
909 skb->data_len = to_write;
910 skb->len += to_write;
911 skb->truesize += to_write;
912 atomic_add(to_write, &po->sk.sk_wmem_alloc);
913
914 while (likely(to_write)) {
915 nr_frags = skb_shinfo(skb)->nr_frags;
916
917 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
918 pr_err("Packet exceed the number of skb frags(%lu)\n",
919 MAX_SKB_FRAGS);
920 return -EFAULT;
921 }
922
923 flush_dcache_page(page);
924 get_page(page);
925 skb_fill_page_desc(skb,
926 nr_frags,
927 page++, offset, len);
928 to_write -= len;
929 offset = 0;
930 len_max = PAGE_SIZE;
931 len = ((to_write > len_max) ? len_max : to_write);
932 }
933
934 return tp_len;
935 }
936
937 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
938 {
939 struct socket *sock;
940 struct sk_buff *skb;
941 struct net_device *dev;
942 __be16 proto;
943 int ifindex, err, reserve = 0;
944 void *ph;
945 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
946 int tp_len, size_max;
947 unsigned char *addr;
948 int len_sum = 0;
949 int status = 0;
950
951 sock = po->sk.sk_socket;
952
953 mutex_lock(&po->pg_vec_lock);
954
955 err = -EBUSY;
956 if (saddr == NULL) {
957 ifindex = po->ifindex;
958 proto = po->num;
959 addr = NULL;
960 } else {
961 err = -EINVAL;
962 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
963 goto out;
964 if (msg->msg_namelen < (saddr->sll_halen
965 + offsetof(struct sockaddr_ll,
966 sll_addr)))
967 goto out;
968 ifindex = saddr->sll_ifindex;
969 proto = saddr->sll_protocol;
970 addr = saddr->sll_addr;
971 }
972
973 dev = dev_get_by_index(sock_net(&po->sk), ifindex);
974 err = -ENXIO;
975 if (unlikely(dev == NULL))
976 goto out;
977
978 reserve = dev->hard_header_len;
979
980 err = -ENETDOWN;
981 if (unlikely(!(dev->flags & IFF_UP)))
982 goto out_put;
983
984 size_max = po->tx_ring.frame_size
985 - sizeof(struct skb_shared_info)
986 - po->tp_hdrlen
987 - LL_ALLOCATED_SPACE(dev)
988 - sizeof(struct sockaddr_ll);
989
990 if (size_max > dev->mtu + reserve)
991 size_max = dev->mtu + reserve;
992
993 do {
994 ph = packet_current_frame(po, &po->tx_ring,
995 TP_STATUS_SEND_REQUEST);
996
997 if (unlikely(ph == NULL)) {
998 schedule();
999 continue;
1000 }
1001
1002 status = TP_STATUS_SEND_REQUEST;
1003 skb = sock_alloc_send_skb(&po->sk,
1004 LL_ALLOCATED_SPACE(dev)
1005 + sizeof(struct sockaddr_ll),
1006 0, &err);
1007
1008 if (unlikely(skb == NULL))
1009 goto out_status;
1010
1011 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1012 addr);
1013
1014 if (unlikely(tp_len < 0)) {
1015 if (po->tp_loss) {
1016 __packet_set_status(po, ph,
1017 TP_STATUS_AVAILABLE);
1018 packet_increment_head(&po->tx_ring);
1019 kfree_skb(skb);
1020 continue;
1021 } else {
1022 status = TP_STATUS_WRONG_FORMAT;
1023 err = tp_len;
1024 goto out_status;
1025 }
1026 }
1027
1028 skb->destructor = tpacket_destruct_skb;
1029 __packet_set_status(po, ph, TP_STATUS_SENDING);
1030 atomic_inc(&po->tx_ring.pending);
1031
1032 status = TP_STATUS_SEND_REQUEST;
1033 err = dev_queue_xmit(skb);
1034 if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0))
1035 goto out_xmit;
1036 packet_increment_head(&po->tx_ring);
1037 len_sum += tp_len;
1038 } while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT))
1039 && (atomic_read(&po->tx_ring.pending))))
1040 );
1041
1042 err = len_sum;
1043 goto out_put;
1044
1045 out_xmit:
1046 skb->destructor = sock_wfree;
1047 atomic_dec(&po->tx_ring.pending);
1048 out_status:
1049 __packet_set_status(po, ph, status);
1050 kfree_skb(skb);
1051 out_put:
1052 dev_put(dev);
1053 out:
1054 mutex_unlock(&po->pg_vec_lock);
1055 return err;
1056 }
1057 #endif
1058
1059 static int packet_snd(struct socket *sock,
1060 struct msghdr *msg, size_t len)
1061 {
1062 struct sock *sk = sock->sk;
1063 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1064 struct sk_buff *skb;
1065 struct net_device *dev;
1066 __be16 proto;
1067 unsigned char *addr;
1068 int ifindex, err, reserve = 0;
1069
1070 /*
1071 * Get and verify the address.
1072 */
1073
1074 if (saddr == NULL) {
1075 struct packet_sock *po = pkt_sk(sk);
1076
1077 ifindex = po->ifindex;
1078 proto = po->num;
1079 addr = NULL;
1080 } else {
1081 err = -EINVAL;
1082 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1083 goto out;
1084 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1085 goto out;
1086 ifindex = saddr->sll_ifindex;
1087 proto = saddr->sll_protocol;
1088 addr = saddr->sll_addr;
1089 }
1090
1091
1092 dev = dev_get_by_index(sock_net(sk), ifindex);
1093 err = -ENXIO;
1094 if (dev == NULL)
1095 goto out_unlock;
1096 if (sock->type == SOCK_RAW)
1097 reserve = dev->hard_header_len;
1098
1099 err = -ENETDOWN;
1100 if (!(dev->flags & IFF_UP))
1101 goto out_unlock;
1102
1103 err = -EMSGSIZE;
1104 if (len > dev->mtu+reserve)
1105 goto out_unlock;
1106
1107 skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
1108 msg->msg_flags & MSG_DONTWAIT, &err);
1109 if (skb == NULL)
1110 goto out_unlock;
1111
1112 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1113 skb_reset_network_header(skb);
1114
1115 err = -EINVAL;
1116 if (sock->type == SOCK_DGRAM &&
1117 dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
1118 goto out_free;
1119
1120 /* Returns -EFAULT on error */
1121 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1122 if (err)
1123 goto out_free;
1124
1125 skb->protocol = proto;
1126 skb->dev = dev;
1127 skb->priority = sk->sk_priority;
1128
1129 /*
1130 * Now send it
1131 */
1132
1133 err = dev_queue_xmit(skb);
1134 if (err > 0 && (err = net_xmit_errno(err)) != 0)
1135 goto out_unlock;
1136
1137 dev_put(dev);
1138
1139 return len;
1140
1141 out_free:
1142 kfree_skb(skb);
1143 out_unlock:
1144 if (dev)
1145 dev_put(dev);
1146 out:
1147 return err;
1148 }
1149
1150 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1151 struct msghdr *msg, size_t len)
1152 {
1153 #ifdef CONFIG_PACKET_MMAP
1154 struct sock *sk = sock->sk;
1155 struct packet_sock *po = pkt_sk(sk);
1156 if (po->tx_ring.pg_vec)
1157 return tpacket_snd(po, msg);
1158 else
1159 #endif
1160 return packet_snd(sock, msg, len);
1161 }
1162
1163 /*
1164 * Close a PACKET socket. This is fairly simple. We immediately go
1165 * to 'closed' state and remove our protocol entry in the device list.
1166 */
1167
1168 static int packet_release(struct socket *sock)
1169 {
1170 struct sock *sk = sock->sk;
1171 struct packet_sock *po;
1172 struct net *net;
1173 #ifdef CONFIG_PACKET_MMAP
1174 struct tpacket_req req;
1175 #endif
1176
1177 if (!sk)
1178 return 0;
1179
1180 net = sock_net(sk);
1181 po = pkt_sk(sk);
1182
1183 write_lock_bh(&net->packet.sklist_lock);
1184 sk_del_node_init(sk);
1185 sock_prot_inuse_add(net, sk->sk_prot, -1);
1186 write_unlock_bh(&net->packet.sklist_lock);
1187
1188 /*
1189 * Unhook packet receive handler.
1190 */
1191
1192 if (po->running) {
1193 /*
1194 * Remove the protocol hook
1195 */
1196 dev_remove_pack(&po->prot_hook);
1197 po->running = 0;
1198 po->num = 0;
1199 __sock_put(sk);
1200 }
1201
1202 packet_flush_mclist(sk);
1203
1204 #ifdef CONFIG_PACKET_MMAP
1205 memset(&req, 0, sizeof(req));
1206
1207 if (po->rx_ring.pg_vec)
1208 packet_set_ring(sk, &req, 1, 0);
1209
1210 if (po->tx_ring.pg_vec)
1211 packet_set_ring(sk, &req, 1, 1);
1212 #endif
1213
1214 /*
1215 * Now the socket is dead. No more input will appear.
1216 */
1217
1218 sock_orphan(sk);
1219 sock->sk = NULL;
1220
1221 /* Purge queues */
1222
1223 skb_queue_purge(&sk->sk_receive_queue);
1224 sk_refcnt_debug_release(sk);
1225
1226 sock_put(sk);
1227 return 0;
1228 }
1229
1230 /*
1231 * Attach a packet hook.
1232 */
1233
1234 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1235 {
1236 struct packet_sock *po = pkt_sk(sk);
1237 /*
1238 * Detach an existing hook if present.
1239 */
1240
1241 lock_sock(sk);
1242
1243 spin_lock(&po->bind_lock);
1244 if (po->running) {
1245 __sock_put(sk);
1246 po->running = 0;
1247 po->num = 0;
1248 spin_unlock(&po->bind_lock);
1249 dev_remove_pack(&po->prot_hook);
1250 spin_lock(&po->bind_lock);
1251 }
1252
1253 po->num = protocol;
1254 po->prot_hook.type = protocol;
1255 po->prot_hook.dev = dev;
1256
1257 po->ifindex = dev ? dev->ifindex : 0;
1258
1259 if (protocol == 0)
1260 goto out_unlock;
1261
1262 if (!dev || (dev->flags & IFF_UP)) {
1263 dev_add_pack(&po->prot_hook);
1264 sock_hold(sk);
1265 po->running = 1;
1266 } else {
1267 sk->sk_err = ENETDOWN;
1268 if (!sock_flag(sk, SOCK_DEAD))
1269 sk->sk_error_report(sk);
1270 }
1271
1272 out_unlock:
1273 spin_unlock(&po->bind_lock);
1274 release_sock(sk);
1275 return 0;
1276 }
1277
1278 /*
1279 * Bind a packet socket to a device
1280 */
1281
1282 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
1283 int addr_len)
1284 {
1285 struct sock *sk = sock->sk;
1286 char name[15];
1287 struct net_device *dev;
1288 int err = -ENODEV;
1289
1290 /*
1291 * Check legality
1292 */
1293
1294 if (addr_len != sizeof(struct sockaddr))
1295 return -EINVAL;
1296 strlcpy(name, uaddr->sa_data, sizeof(name));
1297
1298 dev = dev_get_by_name(sock_net(sk), name);
1299 if (dev) {
1300 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1301 dev_put(dev);
1302 }
1303 return err;
1304 }
1305
1306 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1307 {
1308 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1309 struct sock *sk = sock->sk;
1310 struct net_device *dev = NULL;
1311 int err;
1312
1313
1314 /*
1315 * Check legality
1316 */
1317
1318 if (addr_len < sizeof(struct sockaddr_ll))
1319 return -EINVAL;
1320 if (sll->sll_family != AF_PACKET)
1321 return -EINVAL;
1322
1323 if (sll->sll_ifindex) {
1324 err = -ENODEV;
1325 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1326 if (dev == NULL)
1327 goto out;
1328 }
1329 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1330 if (dev)
1331 dev_put(dev);
1332
1333 out:
1334 return err;
1335 }
1336
1337 static struct proto packet_proto = {
1338 .name = "PACKET",
1339 .owner = THIS_MODULE,
1340 .obj_size = sizeof(struct packet_sock),
1341 };
1342
1343 /*
1344 * Create a packet of type SOCK_PACKET.
1345 */
1346
1347 static int packet_create(struct net *net, struct socket *sock, int protocol)
1348 {
1349 struct sock *sk;
1350 struct packet_sock *po;
1351 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1352 int err;
1353
1354 if (!capable(CAP_NET_RAW))
1355 return -EPERM;
1356 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1357 sock->type != SOCK_PACKET)
1358 return -ESOCKTNOSUPPORT;
1359
1360 sock->state = SS_UNCONNECTED;
1361
1362 err = -ENOBUFS;
1363 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1364 if (sk == NULL)
1365 goto out;
1366
1367 sock->ops = &packet_ops;
1368 if (sock->type == SOCK_PACKET)
1369 sock->ops = &packet_ops_spkt;
1370
1371 sock_init_data(sock, sk);
1372
1373 po = pkt_sk(sk);
1374 sk->sk_family = PF_PACKET;
1375 po->num = proto;
1376
1377 sk->sk_destruct = packet_sock_destruct;
1378 sk_refcnt_debug_inc(sk);
1379
1380 /*
1381 * Attach a protocol block
1382 */
1383
1384 spin_lock_init(&po->bind_lock);
1385 mutex_init(&po->pg_vec_lock);
1386 po->prot_hook.func = packet_rcv;
1387
1388 if (sock->type == SOCK_PACKET)
1389 po->prot_hook.func = packet_rcv_spkt;
1390
1391 po->prot_hook.af_packet_priv = sk;
1392
1393 if (proto) {
1394 po->prot_hook.type = proto;
1395 dev_add_pack(&po->prot_hook);
1396 sock_hold(sk);
1397 po->running = 1;
1398 }
1399
1400 write_lock_bh(&net->packet.sklist_lock);
1401 sk_add_node(sk, &net->packet.sklist);
1402 sock_prot_inuse_add(net, &packet_proto, 1);
1403 write_unlock_bh(&net->packet.sklist_lock);
1404 return 0;
1405 out:
1406 return err;
1407 }
1408
1409 /*
1410 * Pull a packet from our receive queue and hand it to the user.
1411 * If necessary we block.
1412 */
1413
1414 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1415 struct msghdr *msg, size_t len, int flags)
1416 {
1417 struct sock *sk = sock->sk;
1418 struct sk_buff *skb;
1419 int copied, err;
1420 struct sockaddr_ll *sll;
1421
1422 err = -EINVAL;
1423 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
1424 goto out;
1425
1426 #if 0
1427 /* What error should we return now? EUNATTACH? */
1428 if (pkt_sk(sk)->ifindex < 0)
1429 return -ENODEV;
1430 #endif
1431
1432 /*
1433 * Call the generic datagram receiver. This handles all sorts
1434 * of horrible races and re-entrancy so we can forget about it
1435 * in the protocol layers.
1436 *
1437 * Now it will return ENETDOWN, if device have just gone down,
1438 * but then it will block.
1439 */
1440
1441 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1442
1443 /*
1444 * An error occurred so return it. Because skb_recv_datagram()
1445 * handles the blocking we don't see and worry about blocking
1446 * retries.
1447 */
1448
1449 if (skb == NULL)
1450 goto out;
1451
1452 /*
1453 * If the address length field is there to be filled in, we fill
1454 * it in now.
1455 */
1456
1457 sll = &PACKET_SKB_CB(skb)->sa.ll;
1458 if (sock->type == SOCK_PACKET)
1459 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1460 else
1461 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1462
1463 /*
1464 * You lose any data beyond the buffer you gave. If it worries a
1465 * user program they can ask the device for its MTU anyway.
1466 */
1467
1468 copied = skb->len;
1469 if (copied > len) {
1470 copied = len;
1471 msg->msg_flags |= MSG_TRUNC;
1472 }
1473
1474 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1475 if (err)
1476 goto out_free;
1477
1478 sock_recv_timestamp(msg, sk, skb);
1479
1480 if (msg->msg_name)
1481 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1482 msg->msg_namelen);
1483
1484 if (pkt_sk(sk)->auxdata) {
1485 struct tpacket_auxdata aux;
1486
1487 aux.tp_status = TP_STATUS_USER;
1488 if (skb->ip_summed == CHECKSUM_PARTIAL)
1489 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1490 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1491 aux.tp_snaplen = skb->len;
1492 aux.tp_mac = 0;
1493 aux.tp_net = skb_network_offset(skb);
1494 aux.tp_vlan_tci = skb->vlan_tci;
1495
1496 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1497 }
1498
1499 /*
1500 * Free or return the buffer as appropriate. Again this
1501 * hides all the races and re-entrancy issues from us.
1502 */
1503 err = (flags&MSG_TRUNC) ? skb->len : copied;
1504
1505 out_free:
1506 skb_free_datagram(sk, skb);
1507 out:
1508 return err;
1509 }
1510
1511 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1512 int *uaddr_len, int peer)
1513 {
1514 struct net_device *dev;
1515 struct sock *sk = sock->sk;
1516
1517 if (peer)
1518 return -EOPNOTSUPP;
1519
1520 uaddr->sa_family = AF_PACKET;
1521 dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex);
1522 if (dev) {
1523 strlcpy(uaddr->sa_data, dev->name, 15);
1524 dev_put(dev);
1525 } else
1526 memset(uaddr->sa_data, 0, 14);
1527 *uaddr_len = sizeof(*uaddr);
1528
1529 return 0;
1530 }
1531
1532 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1533 int *uaddr_len, int peer)
1534 {
1535 struct net_device *dev;
1536 struct sock *sk = sock->sk;
1537 struct packet_sock *po = pkt_sk(sk);
1538 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1539
1540 if (peer)
1541 return -EOPNOTSUPP;
1542
1543 sll->sll_family = AF_PACKET;
1544 sll->sll_ifindex = po->ifindex;
1545 sll->sll_protocol = po->num;
1546 dev = dev_get_by_index(sock_net(sk), po->ifindex);
1547 if (dev) {
1548 sll->sll_hatype = dev->type;
1549 sll->sll_halen = dev->addr_len;
1550 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1551 dev_put(dev);
1552 } else {
1553 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1554 sll->sll_halen = 0;
1555 }
1556 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1557
1558 return 0;
1559 }
1560
1561 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1562 int what)
1563 {
1564 switch (i->type) {
1565 case PACKET_MR_MULTICAST:
1566 if (what > 0)
1567 return dev_mc_add(dev, i->addr, i->alen, 0);
1568 else
1569 return dev_mc_delete(dev, i->addr, i->alen, 0);
1570 break;
1571 case PACKET_MR_PROMISC:
1572 return dev_set_promiscuity(dev, what);
1573 break;
1574 case PACKET_MR_ALLMULTI:
1575 return dev_set_allmulti(dev, what);
1576 break;
1577 case PACKET_MR_UNICAST:
1578 if (what > 0)
1579 return dev_unicast_add(dev, i->addr);
1580 else
1581 return dev_unicast_delete(dev, i->addr);
1582 break;
1583 default:
1584 break;
1585 }
1586 return 0;
1587 }
1588
1589 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1590 {
1591 for ( ; i; i = i->next) {
1592 if (i->ifindex == dev->ifindex)
1593 packet_dev_mc(dev, i, what);
1594 }
1595 }
1596
1597 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1598 {
1599 struct packet_sock *po = pkt_sk(sk);
1600 struct packet_mclist *ml, *i;
1601 struct net_device *dev;
1602 int err;
1603
1604 rtnl_lock();
1605
1606 err = -ENODEV;
1607 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1608 if (!dev)
1609 goto done;
1610
1611 err = -EINVAL;
1612 if (mreq->mr_alen > dev->addr_len)
1613 goto done;
1614
1615 err = -ENOBUFS;
1616 i = kmalloc(sizeof(*i), GFP_KERNEL);
1617 if (i == NULL)
1618 goto done;
1619
1620 err = 0;
1621 for (ml = po->mclist; ml; ml = ml->next) {
1622 if (ml->ifindex == mreq->mr_ifindex &&
1623 ml->type == mreq->mr_type &&
1624 ml->alen == mreq->mr_alen &&
1625 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1626 ml->count++;
1627 /* Free the new element ... */
1628 kfree(i);
1629 goto done;
1630 }
1631 }
1632
1633 i->type = mreq->mr_type;
1634 i->ifindex = mreq->mr_ifindex;
1635 i->alen = mreq->mr_alen;
1636 memcpy(i->addr, mreq->mr_address, i->alen);
1637 i->count = 1;
1638 i->next = po->mclist;
1639 po->mclist = i;
1640 err = packet_dev_mc(dev, i, 1);
1641 if (err) {
1642 po->mclist = i->next;
1643 kfree(i);
1644 }
1645
1646 done:
1647 rtnl_unlock();
1648 return err;
1649 }
1650
1651 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1652 {
1653 struct packet_mclist *ml, **mlp;
1654
1655 rtnl_lock();
1656
1657 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1658 if (ml->ifindex == mreq->mr_ifindex &&
1659 ml->type == mreq->mr_type &&
1660 ml->alen == mreq->mr_alen &&
1661 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1662 if (--ml->count == 0) {
1663 struct net_device *dev;
1664 *mlp = ml->next;
1665 dev = dev_get_by_index(sock_net(sk), ml->ifindex);
1666 if (dev) {
1667 packet_dev_mc(dev, ml, -1);
1668 dev_put(dev);
1669 }
1670 kfree(ml);
1671 }
1672 rtnl_unlock();
1673 return 0;
1674 }
1675 }
1676 rtnl_unlock();
1677 return -EADDRNOTAVAIL;
1678 }
1679
1680 static void packet_flush_mclist(struct sock *sk)
1681 {
1682 struct packet_sock *po = pkt_sk(sk);
1683 struct packet_mclist *ml;
1684
1685 if (!po->mclist)
1686 return;
1687
1688 rtnl_lock();
1689 while ((ml = po->mclist) != NULL) {
1690 struct net_device *dev;
1691
1692 po->mclist = ml->next;
1693 dev = dev_get_by_index(sock_net(sk), ml->ifindex);
1694 if (dev != NULL) {
1695 packet_dev_mc(dev, ml, -1);
1696 dev_put(dev);
1697 }
1698 kfree(ml);
1699 }
1700 rtnl_unlock();
1701 }
1702
1703 static int
1704 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1705 {
1706 struct sock *sk = sock->sk;
1707 struct packet_sock *po = pkt_sk(sk);
1708 int ret;
1709
1710 if (level != SOL_PACKET)
1711 return -ENOPROTOOPT;
1712
1713 switch (optname) {
1714 case PACKET_ADD_MEMBERSHIP:
1715 case PACKET_DROP_MEMBERSHIP:
1716 {
1717 struct packet_mreq_max mreq;
1718 int len = optlen;
1719 memset(&mreq, 0, sizeof(mreq));
1720 if (len < sizeof(struct packet_mreq))
1721 return -EINVAL;
1722 if (len > sizeof(mreq))
1723 len = sizeof(mreq);
1724 if (copy_from_user(&mreq, optval, len))
1725 return -EFAULT;
1726 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1727 return -EINVAL;
1728 if (optname == PACKET_ADD_MEMBERSHIP)
1729 ret = packet_mc_add(sk, &mreq);
1730 else
1731 ret = packet_mc_drop(sk, &mreq);
1732 return ret;
1733 }
1734
1735 #ifdef CONFIG_PACKET_MMAP
1736 case PACKET_RX_RING:
1737 case PACKET_TX_RING:
1738 {
1739 struct tpacket_req req;
1740
1741 if (optlen < sizeof(req))
1742 return -EINVAL;
1743 if (copy_from_user(&req, optval, sizeof(req)))
1744 return -EFAULT;
1745 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
1746 }
1747 case PACKET_COPY_THRESH:
1748 {
1749 int val;
1750
1751 if (optlen != sizeof(val))
1752 return -EINVAL;
1753 if (copy_from_user(&val, optval, sizeof(val)))
1754 return -EFAULT;
1755
1756 pkt_sk(sk)->copy_thresh = val;
1757 return 0;
1758 }
1759 case PACKET_VERSION:
1760 {
1761 int val;
1762
1763 if (optlen != sizeof(val))
1764 return -EINVAL;
1765 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1766 return -EBUSY;
1767 if (copy_from_user(&val, optval, sizeof(val)))
1768 return -EFAULT;
1769 switch (val) {
1770 case TPACKET_V1:
1771 case TPACKET_V2:
1772 po->tp_version = val;
1773 return 0;
1774 default:
1775 return -EINVAL;
1776 }
1777 }
1778 case PACKET_RESERVE:
1779 {
1780 unsigned int val;
1781
1782 if (optlen != sizeof(val))
1783 return -EINVAL;
1784 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1785 return -EBUSY;
1786 if (copy_from_user(&val, optval, sizeof(val)))
1787 return -EFAULT;
1788 po->tp_reserve = val;
1789 return 0;
1790 }
1791 case PACKET_LOSS:
1792 {
1793 unsigned int val;
1794
1795 if (optlen != sizeof(val))
1796 return -EINVAL;
1797 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1798 return -EBUSY;
1799 if (copy_from_user(&val, optval, sizeof(val)))
1800 return -EFAULT;
1801 po->tp_loss = !!val;
1802 return 0;
1803 }
1804 #endif
1805 case PACKET_AUXDATA:
1806 {
1807 int val;
1808
1809 if (optlen < sizeof(val))
1810 return -EINVAL;
1811 if (copy_from_user(&val, optval, sizeof(val)))
1812 return -EFAULT;
1813
1814 po->auxdata = !!val;
1815 return 0;
1816 }
1817 case PACKET_ORIGDEV:
1818 {
1819 int val;
1820
1821 if (optlen < sizeof(val))
1822 return -EINVAL;
1823 if (copy_from_user(&val, optval, sizeof(val)))
1824 return -EFAULT;
1825
1826 po->origdev = !!val;
1827 return 0;
1828 }
1829 default:
1830 return -ENOPROTOOPT;
1831 }
1832 }
1833
1834 static int packet_getsockopt(struct socket *sock, int level, int optname,
1835 char __user *optval, int __user *optlen)
1836 {
1837 int len;
1838 int val;
1839 struct sock *sk = sock->sk;
1840 struct packet_sock *po = pkt_sk(sk);
1841 void *data;
1842 struct tpacket_stats st;
1843
1844 if (level != SOL_PACKET)
1845 return -ENOPROTOOPT;
1846
1847 if (get_user(len, optlen))
1848 return -EFAULT;
1849
1850 if (len < 0)
1851 return -EINVAL;
1852
1853 switch (optname) {
1854 case PACKET_STATISTICS:
1855 if (len > sizeof(struct tpacket_stats))
1856 len = sizeof(struct tpacket_stats);
1857 spin_lock_bh(&sk->sk_receive_queue.lock);
1858 st = po->stats;
1859 memset(&po->stats, 0, sizeof(st));
1860 spin_unlock_bh(&sk->sk_receive_queue.lock);
1861 st.tp_packets += st.tp_drops;
1862
1863 data = &st;
1864 break;
1865 case PACKET_AUXDATA:
1866 if (len > sizeof(int))
1867 len = sizeof(int);
1868 val = po->auxdata;
1869
1870 data = &val;
1871 break;
1872 case PACKET_ORIGDEV:
1873 if (len > sizeof(int))
1874 len = sizeof(int);
1875 val = po->origdev;
1876
1877 data = &val;
1878 break;
1879 #ifdef CONFIG_PACKET_MMAP
1880 case PACKET_VERSION:
1881 if (len > sizeof(int))
1882 len = sizeof(int);
1883 val = po->tp_version;
1884 data = &val;
1885 break;
1886 case PACKET_HDRLEN:
1887 if (len > sizeof(int))
1888 len = sizeof(int);
1889 if (copy_from_user(&val, optval, len))
1890 return -EFAULT;
1891 switch (val) {
1892 case TPACKET_V1:
1893 val = sizeof(struct tpacket_hdr);
1894 break;
1895 case TPACKET_V2:
1896 val = sizeof(struct tpacket2_hdr);
1897 break;
1898 default:
1899 return -EINVAL;
1900 }
1901 data = &val;
1902 break;
1903 case PACKET_RESERVE:
1904 if (len > sizeof(unsigned int))
1905 len = sizeof(unsigned int);
1906 val = po->tp_reserve;
1907 data = &val;
1908 break;
1909 case PACKET_LOSS:
1910 if (len > sizeof(unsigned int))
1911 len = sizeof(unsigned int);
1912 val = po->tp_loss;
1913 data = &val;
1914 break;
1915 #endif
1916 default:
1917 return -ENOPROTOOPT;
1918 }
1919
1920 if (put_user(len, optlen))
1921 return -EFAULT;
1922 if (copy_to_user(optval, data, len))
1923 return -EFAULT;
1924 return 0;
1925 }
1926
1927
1928 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
1929 {
1930 struct sock *sk;
1931 struct hlist_node *node;
1932 struct net_device *dev = data;
1933 struct net *net = dev_net(dev);
1934
1935 read_lock(&net->packet.sklist_lock);
1936 sk_for_each(sk, node, &net->packet.sklist) {
1937 struct packet_sock *po = pkt_sk(sk);
1938
1939 switch (msg) {
1940 case NETDEV_UNREGISTER:
1941 if (po->mclist)
1942 packet_dev_mclist(dev, po->mclist, -1);
1943 /* fallthrough */
1944
1945 case NETDEV_DOWN:
1946 if (dev->ifindex == po->ifindex) {
1947 spin_lock(&po->bind_lock);
1948 if (po->running) {
1949 __dev_remove_pack(&po->prot_hook);
1950 __sock_put(sk);
1951 po->running = 0;
1952 sk->sk_err = ENETDOWN;
1953 if (!sock_flag(sk, SOCK_DEAD))
1954 sk->sk_error_report(sk);
1955 }
1956 if (msg == NETDEV_UNREGISTER) {
1957 po->ifindex = -1;
1958 po->prot_hook.dev = NULL;
1959 }
1960 spin_unlock(&po->bind_lock);
1961 }
1962 break;
1963 case NETDEV_UP:
1964 spin_lock(&po->bind_lock);
1965 if (dev->ifindex == po->ifindex && po->num &&
1966 !po->running) {
1967 dev_add_pack(&po->prot_hook);
1968 sock_hold(sk);
1969 po->running = 1;
1970 }
1971 spin_unlock(&po->bind_lock);
1972 break;
1973 }
1974 }
1975 read_unlock(&net->packet.sklist_lock);
1976 return NOTIFY_DONE;
1977 }
1978
1979
1980 static int packet_ioctl(struct socket *sock, unsigned int cmd,
1981 unsigned long arg)
1982 {
1983 struct sock *sk = sock->sk;
1984
1985 switch (cmd) {
1986 case SIOCOUTQ:
1987 {
1988 int amount = sk_wmem_alloc_get(sk);
1989
1990 return put_user(amount, (int __user *)arg);
1991 }
1992 case SIOCINQ:
1993 {
1994 struct sk_buff *skb;
1995 int amount = 0;
1996
1997 spin_lock_bh(&sk->sk_receive_queue.lock);
1998 skb = skb_peek(&sk->sk_receive_queue);
1999 if (skb)
2000 amount = skb->len;
2001 spin_unlock_bh(&sk->sk_receive_queue.lock);
2002 return put_user(amount, (int __user *)arg);
2003 }
2004 case SIOCGSTAMP:
2005 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2006 case SIOCGSTAMPNS:
2007 return sock_get_timestampns(sk, (struct timespec __user *)arg);
2008
2009 #ifdef CONFIG_INET
2010 case SIOCADDRT:
2011 case SIOCDELRT:
2012 case SIOCDARP:
2013 case SIOCGARP:
2014 case SIOCSARP:
2015 case SIOCGIFADDR:
2016 case SIOCSIFADDR:
2017 case SIOCGIFBRDADDR:
2018 case SIOCSIFBRDADDR:
2019 case SIOCGIFNETMASK:
2020 case SIOCSIFNETMASK:
2021 case SIOCGIFDSTADDR:
2022 case SIOCSIFDSTADDR:
2023 case SIOCSIFFLAGS:
2024 if (!net_eq(sock_net(sk), &init_net))
2025 return -ENOIOCTLCMD;
2026 return inet_dgram_ops.ioctl(sock, cmd, arg);
2027 #endif
2028
2029 default:
2030 return -ENOIOCTLCMD;
2031 }
2032 return 0;
2033 }
2034
2035 #ifndef CONFIG_PACKET_MMAP
2036 #define packet_mmap sock_no_mmap
2037 #define packet_poll datagram_poll
2038 #else
2039
2040 static unsigned int packet_poll(struct file *file, struct socket *sock,
2041 poll_table *wait)
2042 {
2043 struct sock *sk = sock->sk;
2044 struct packet_sock *po = pkt_sk(sk);
2045 unsigned int mask = datagram_poll(file, sock, wait);
2046
2047 spin_lock_bh(&sk->sk_receive_queue.lock);
2048 if (po->rx_ring.pg_vec) {
2049 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
2050 mask |= POLLIN | POLLRDNORM;
2051 }
2052 spin_unlock_bh(&sk->sk_receive_queue.lock);
2053 spin_lock_bh(&sk->sk_write_queue.lock);
2054 if (po->tx_ring.pg_vec) {
2055 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2056 mask |= POLLOUT | POLLWRNORM;
2057 }
2058 spin_unlock_bh(&sk->sk_write_queue.lock);
2059 return mask;
2060 }
2061
2062
2063 /* Dirty? Well, I still did not learn better way to account
2064 * for user mmaps.
2065 */
2066
2067 static void packet_mm_open(struct vm_area_struct *vma)
2068 {
2069 struct file *file = vma->vm_file;
2070 struct socket *sock = file->private_data;
2071 struct sock *sk = sock->sk;
2072
2073 if (sk)
2074 atomic_inc(&pkt_sk(sk)->mapped);
2075 }
2076
2077 static void packet_mm_close(struct vm_area_struct *vma)
2078 {
2079 struct file *file = vma->vm_file;
2080 struct socket *sock = file->private_data;
2081 struct sock *sk = sock->sk;
2082
2083 if (sk)
2084 atomic_dec(&pkt_sk(sk)->mapped);
2085 }
2086
2087 static const struct vm_operations_struct packet_mmap_ops = {
2088 .open = packet_mm_open,
2089 .close = packet_mm_close,
2090 };
2091
2092 static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
2093 {
2094 int i;
2095
2096 for (i = 0; i < len; i++) {
2097 if (likely(pg_vec[i]))
2098 free_pages((unsigned long) pg_vec[i], order);
2099 }
2100 kfree(pg_vec);
2101 }
2102
2103 static inline char *alloc_one_pg_vec_page(unsigned long order)
2104 {
2105 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;
2106
2107 return (char *) __get_free_pages(gfp_flags, order);
2108 }
2109
2110 static char **alloc_pg_vec(struct tpacket_req *req, int order)
2111 {
2112 unsigned int block_nr = req->tp_block_nr;
2113 char **pg_vec;
2114 int i;
2115
2116 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
2117 if (unlikely(!pg_vec))
2118 goto out;
2119
2120 for (i = 0; i < block_nr; i++) {
2121 pg_vec[i] = alloc_one_pg_vec_page(order);
2122 if (unlikely(!pg_vec[i]))
2123 goto out_free_pgvec;
2124 }
2125
2126 out:
2127 return pg_vec;
2128
2129 out_free_pgvec:
2130 free_pg_vec(pg_vec, order, block_nr);
2131 pg_vec = NULL;
2132 goto out;
2133 }
2134
2135 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2136 int closing, int tx_ring)
2137 {
2138 char **pg_vec = NULL;
2139 struct packet_sock *po = pkt_sk(sk);
2140 int was_running, order = 0;
2141 struct packet_ring_buffer *rb;
2142 struct sk_buff_head *rb_queue;
2143 __be16 num;
2144 int err;
2145
2146 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2147 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2148
2149 err = -EBUSY;
2150 if (!closing) {
2151 if (atomic_read(&po->mapped))
2152 goto out;
2153 if (atomic_read(&rb->pending))
2154 goto out;
2155 }
2156
2157 if (req->tp_block_nr) {
2158 /* Sanity tests and some calculations */
2159 err = -EBUSY;
2160 if (unlikely(rb->pg_vec))
2161 goto out;
2162
2163 switch (po->tp_version) {
2164 case TPACKET_V1:
2165 po->tp_hdrlen = TPACKET_HDRLEN;
2166 break;
2167 case TPACKET_V2:
2168 po->tp_hdrlen = TPACKET2_HDRLEN;
2169 break;
2170 }
2171
2172 err = -EINVAL;
2173 if (unlikely((int)req->tp_block_size <= 0))
2174 goto out;
2175 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
2176 goto out;
2177 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
2178 po->tp_reserve))
2179 goto out;
2180 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
2181 goto out;
2182
2183 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2184 if (unlikely(rb->frames_per_block <= 0))
2185 goto out;
2186 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2187 req->tp_frame_nr))
2188 goto out;
2189
2190 err = -ENOMEM;
2191 order = get_order(req->tp_block_size);
2192 pg_vec = alloc_pg_vec(req, order);
2193 if (unlikely(!pg_vec))
2194 goto out;
2195 }
2196 /* Done */
2197 else {
2198 err = -EINVAL;
2199 if (unlikely(req->tp_frame_nr))
2200 goto out;
2201 }
2202
2203 lock_sock(sk);
2204
2205 /* Detach socket from network */
2206 spin_lock(&po->bind_lock);
2207 was_running = po->running;
2208 num = po->num;
2209 if (was_running) {
2210 __dev_remove_pack(&po->prot_hook);
2211 po->num = 0;
2212 po->running = 0;
2213 __sock_put(sk);
2214 }
2215 spin_unlock(&po->bind_lock);
2216
2217 synchronize_net();
2218
2219 err = -EBUSY;
2220 mutex_lock(&po->pg_vec_lock);
2221 if (closing || atomic_read(&po->mapped) == 0) {
2222 err = 0;
2223 #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
2224 spin_lock_bh(&rb_queue->lock);
2225 pg_vec = XC(rb->pg_vec, pg_vec);
2226 rb->frame_max = (req->tp_frame_nr - 1);
2227 rb->head = 0;
2228 rb->frame_size = req->tp_frame_size;
2229 spin_unlock_bh(&rb_queue->lock);
2230
2231 order = XC(rb->pg_vec_order, order);
2232 req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr);
2233
2234 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2235 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2236 tpacket_rcv : packet_rcv;
2237 skb_queue_purge(rb_queue);
2238 #undef XC
2239 if (atomic_read(&po->mapped))
2240 pr_err("packet_mmap: vma is busy: %d\n",
2241 atomic_read(&po->mapped));
2242 }
2243 mutex_unlock(&po->pg_vec_lock);
2244
2245 spin_lock(&po->bind_lock);
2246 if (was_running && !po->running) {
2247 sock_hold(sk);
2248 po->running = 1;
2249 po->num = num;
2250 dev_add_pack(&po->prot_hook);
2251 }
2252 spin_unlock(&po->bind_lock);
2253
2254 release_sock(sk);
2255
2256 if (pg_vec)
2257 free_pg_vec(pg_vec, order, req->tp_block_nr);
2258 out:
2259 return err;
2260 }
2261
2262 static int packet_mmap(struct file *file, struct socket *sock,
2263 struct vm_area_struct *vma)
2264 {
2265 struct sock *sk = sock->sk;
2266 struct packet_sock *po = pkt_sk(sk);
2267 unsigned long size, expected_size;
2268 struct packet_ring_buffer *rb;
2269 unsigned long start;
2270 int err = -EINVAL;
2271 int i;
2272
2273 if (vma->vm_pgoff)
2274 return -EINVAL;
2275
2276 mutex_lock(&po->pg_vec_lock);
2277
2278 expected_size = 0;
2279 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2280 if (rb->pg_vec) {
2281 expected_size += rb->pg_vec_len
2282 * rb->pg_vec_pages
2283 * PAGE_SIZE;
2284 }
2285 }
2286
2287 if (expected_size == 0)
2288 goto out;
2289
2290 size = vma->vm_end - vma->vm_start;
2291 if (size != expected_size)
2292 goto out;
2293
2294 start = vma->vm_start;
2295 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2296 if (rb->pg_vec == NULL)
2297 continue;
2298
2299 for (i = 0; i < rb->pg_vec_len; i++) {
2300 struct page *page = virt_to_page(rb->pg_vec[i]);
2301 int pg_num;
2302
2303 for (pg_num = 0; pg_num < rb->pg_vec_pages;
2304 pg_num++, page++) {
2305 err = vm_insert_page(vma, start, page);
2306 if (unlikely(err))
2307 goto out;
2308 start += PAGE_SIZE;
2309 }
2310 }
2311 }
2312
2313 atomic_inc(&po->mapped);
2314 vma->vm_ops = &packet_mmap_ops;
2315 err = 0;
2316
2317 out:
2318 mutex_unlock(&po->pg_vec_lock);
2319 return err;
2320 }
2321 #endif
2322
2323
2324 static const struct proto_ops packet_ops_spkt = {
2325 .family = PF_PACKET,
2326 .owner = THIS_MODULE,
2327 .release = packet_release,
2328 .bind = packet_bind_spkt,
2329 .connect = sock_no_connect,
2330 .socketpair = sock_no_socketpair,
2331 .accept = sock_no_accept,
2332 .getname = packet_getname_spkt,
2333 .poll = datagram_poll,
2334 .ioctl = packet_ioctl,
2335 .listen = sock_no_listen,
2336 .shutdown = sock_no_shutdown,
2337 .setsockopt = sock_no_setsockopt,
2338 .getsockopt = sock_no_getsockopt,
2339 .sendmsg = packet_sendmsg_spkt,
2340 .recvmsg = packet_recvmsg,
2341 .mmap = sock_no_mmap,
2342 .sendpage = sock_no_sendpage,
2343 };
2344
2345 static const struct proto_ops packet_ops = {
2346 .family = PF_PACKET,
2347 .owner = THIS_MODULE,
2348 .release = packet_release,
2349 .bind = packet_bind,
2350 .connect = sock_no_connect,
2351 .socketpair = sock_no_socketpair,
2352 .accept = sock_no_accept,
2353 .getname = packet_getname,
2354 .poll = packet_poll,
2355 .ioctl = packet_ioctl,
2356 .listen = sock_no_listen,
2357 .shutdown = sock_no_shutdown,
2358 .setsockopt = packet_setsockopt,
2359 .getsockopt = packet_getsockopt,
2360 .sendmsg = packet_sendmsg,
2361 .recvmsg = packet_recvmsg,
2362 .mmap = packet_mmap,
2363 .sendpage = sock_no_sendpage,
2364 };
2365
2366 static struct net_proto_family packet_family_ops = {
2367 .family = PF_PACKET,
2368 .create = packet_create,
2369 .owner = THIS_MODULE,
2370 };
2371
2372 static struct notifier_block packet_netdev_notifier = {
2373 .notifier_call = packet_notifier,
2374 };
2375
2376 #ifdef CONFIG_PROC_FS
2377 static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
2378 {
2379 struct sock *s;
2380 struct hlist_node *node;
2381
2382 sk_for_each(s, node, &net->packet.sklist) {
2383 if (!off--)
2384 return s;
2385 }
2386 return NULL;
2387 }
2388
2389 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2390 __acquires(seq_file_net(seq)->packet.sklist_lock)
2391 {
2392 struct net *net = seq_file_net(seq);
2393 read_lock(&net->packet.sklist_lock);
2394 return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
2395 }
2396
2397 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2398 {
2399 struct net *net = seq_file_net(seq);
2400 ++*pos;
2401 return (v == SEQ_START_TOKEN)
2402 ? sk_head(&net->packet.sklist)
2403 : sk_next((struct sock *)v) ;
2404 }
2405
2406 static void packet_seq_stop(struct seq_file *seq, void *v)
2407 __releases(seq_file_net(seq)->packet.sklist_lock)
2408 {
2409 struct net *net = seq_file_net(seq);
2410 read_unlock(&net->packet.sklist_lock);
2411 }
2412
2413 static int packet_seq_show(struct seq_file *seq, void *v)
2414 {
2415 if (v == SEQ_START_TOKEN)
2416 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2417 else {
2418 struct sock *s = v;
2419 const struct packet_sock *po = pkt_sk(s);
2420
2421 seq_printf(seq,
2422 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2423 s,
2424 atomic_read(&s->sk_refcnt),
2425 s->sk_type,
2426 ntohs(po->num),
2427 po->ifindex,
2428 po->running,
2429 atomic_read(&s->sk_rmem_alloc),
2430 sock_i_uid(s),
2431 sock_i_ino(s));
2432 }
2433
2434 return 0;
2435 }
2436
2437 static const struct seq_operations packet_seq_ops = {
2438 .start = packet_seq_start,
2439 .next = packet_seq_next,
2440 .stop = packet_seq_stop,
2441 .show = packet_seq_show,
2442 };
2443
2444 static int packet_seq_open(struct inode *inode, struct file *file)
2445 {
2446 return seq_open_net(inode, file, &packet_seq_ops,
2447 sizeof(struct seq_net_private));
2448 }
2449
2450 static const struct file_operations packet_seq_fops = {
2451 .owner = THIS_MODULE,
2452 .open = packet_seq_open,
2453 .read = seq_read,
2454 .llseek = seq_lseek,
2455 .release = seq_release_net,
2456 };
2457
2458 #endif
2459
2460 static int packet_net_init(struct net *net)
2461 {
2462 rwlock_init(&net->packet.sklist_lock);
2463 INIT_HLIST_HEAD(&net->packet.sklist);
2464
2465 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2466 return -ENOMEM;
2467
2468 return 0;
2469 }
2470
2471 static void packet_net_exit(struct net *net)
2472 {
2473 proc_net_remove(net, "packet");
2474 }
2475
2476 static struct pernet_operations packet_net_ops = {
2477 .init = packet_net_init,
2478 .exit = packet_net_exit,
2479 };
2480
2481
2482 static void __exit packet_exit(void)
2483 {
2484 unregister_netdevice_notifier(&packet_netdev_notifier);
2485 unregister_pernet_subsys(&packet_net_ops);
2486 sock_unregister(PF_PACKET);
2487 proto_unregister(&packet_proto);
2488 }
2489
2490 static int __init packet_init(void)
2491 {
2492 int rc = proto_register(&packet_proto, 0);
2493
2494 if (rc != 0)
2495 goto out;
2496
2497 sock_register(&packet_family_ops);
2498 register_pernet_subsys(&packet_net_ops);
2499 register_netdevice_notifier(&packet_netdev_notifier);
2500 out:
2501 return rc;
2502 }
2503
2504 module_init(packet_init);
2505 module_exit(packet_exit);
2506 MODULE_LICENSE("GPL");
2507 MODULE_ALIAS_NETPROTO(PF_PACKET);
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