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htcleo: add Cotulla's fixes for non-android touchscreen!
[htc-linux.git] / net / packet / af_packet.c
blob41866eb2b5b66ba2b6b9feaaa54391d9299ae253
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 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
986
987 if (size_max > dev->mtu + reserve)
988 size_max = dev->mtu + reserve;
989
990 do {
991 ph = packet_current_frame(po, &po->tx_ring,
992 TP_STATUS_SEND_REQUEST);
993
994 if (unlikely(ph == NULL)) {
995 schedule();
996 continue;
997 }
998
999 status = TP_STATUS_SEND_REQUEST;
1000 skb = sock_alloc_send_skb(&po->sk,
1001 LL_ALLOCATED_SPACE(dev)
1002 + sizeof(struct sockaddr_ll),
1003 0, &err);
1004
1005 if (unlikely(skb == NULL))
1006 goto out_status;
1007
1008 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1009 addr);
1010
1011 if (unlikely(tp_len < 0)) {
1012 if (po->tp_loss) {
1013 __packet_set_status(po, ph,
1014 TP_STATUS_AVAILABLE);
1015 packet_increment_head(&po->tx_ring);
1016 kfree_skb(skb);
1017 continue;
1018 } else {
1019 status = TP_STATUS_WRONG_FORMAT;
1020 err = tp_len;
1021 goto out_status;
1022 }
1023 }
1024
1025 skb->destructor = tpacket_destruct_skb;
1026 __packet_set_status(po, ph, TP_STATUS_SENDING);
1027 atomic_inc(&po->tx_ring.pending);
1028
1029 status = TP_STATUS_SEND_REQUEST;
1030 err = dev_queue_xmit(skb);
1031 if (unlikely(err > 0)) {
1032 err = net_xmit_errno(err);
1033 if (err && __packet_get_status(po, ph) ==
1034 TP_STATUS_AVAILABLE) {
1035 /* skb was destructed already */
1036 skb = NULL;
1037 goto out_status;
1038 }
1039 /*
1040 * skb was dropped but not destructed yet;
1041 * let's treat it like congestion or err < 0
1042 */
1043 err = 0;
1044 }
1045 packet_increment_head(&po->tx_ring);
1046 len_sum += tp_len;
1047 } while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT))
1048 && (atomic_read(&po->tx_ring.pending))))
1049 );
1050
1051 err = len_sum;
1052 goto out_put;
1053
1054 out_status:
1055 __packet_set_status(po, ph, status);
1056 kfree_skb(skb);
1057 out_put:
1058 dev_put(dev);
1059 out:
1060 mutex_unlock(&po->pg_vec_lock);
1061 return err;
1062 }
1063 #endif
1064
1065 static int packet_snd(struct socket *sock,
1066 struct msghdr *msg, size_t len)
1067 {
1068 struct sock *sk = sock->sk;
1069 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1070 struct sk_buff *skb;
1071 struct net_device *dev;
1072 __be16 proto;
1073 unsigned char *addr;
1074 int ifindex, err, reserve = 0;
1075
1076 /*
1077 * Get and verify the address.
1078 */
1079
1080 if (saddr == NULL) {
1081 struct packet_sock *po = pkt_sk(sk);
1082
1083 ifindex = po->ifindex;
1084 proto = po->num;
1085 addr = NULL;
1086 } else {
1087 err = -EINVAL;
1088 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1089 goto out;
1090 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1091 goto out;
1092 ifindex = saddr->sll_ifindex;
1093 proto = saddr->sll_protocol;
1094 addr = saddr->sll_addr;
1095 }
1096
1097
1098 dev = dev_get_by_index(sock_net(sk), ifindex);
1099 err = -ENXIO;
1100 if (dev == NULL)
1101 goto out_unlock;
1102 if (sock->type == SOCK_RAW)
1103 reserve = dev->hard_header_len;
1104
1105 err = -ENETDOWN;
1106 if (!(dev->flags & IFF_UP))
1107 goto out_unlock;
1108
1109 err = -EMSGSIZE;
1110 if (len > dev->mtu+reserve)
1111 goto out_unlock;
1112
1113 skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
1114 msg->msg_flags & MSG_DONTWAIT, &err);
1115 if (skb == NULL)
1116 goto out_unlock;
1117
1118 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1119 skb_reset_network_header(skb);
1120
1121 err = -EINVAL;
1122 if (sock->type == SOCK_DGRAM &&
1123 dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
1124 goto out_free;
1125
1126 /* Returns -EFAULT on error */
1127 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1128 if (err)
1129 goto out_free;
1130
1131 skb->protocol = proto;
1132 skb->dev = dev;
1133 skb->priority = sk->sk_priority;
1134
1135 /*
1136 * Now send it
1137 */
1138
1139 err = dev_queue_xmit(skb);
1140 if (err > 0 && (err = net_xmit_errno(err)) != 0)
1141 goto out_unlock;
1142
1143 dev_put(dev);
1144
1145 return len;
1146
1147 out_free:
1148 kfree_skb(skb);
1149 out_unlock:
1150 if (dev)
1151 dev_put(dev);
1152 out:
1153 return err;
1154 }
1155
1156 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1157 struct msghdr *msg, size_t len)
1158 {
1159 #ifdef CONFIG_PACKET_MMAP
1160 struct sock *sk = sock->sk;
1161 struct packet_sock *po = pkt_sk(sk);
1162 if (po->tx_ring.pg_vec)
1163 return tpacket_snd(po, msg);
1164 else
1165 #endif
1166 return packet_snd(sock, msg, len);
1167 }
1168
1169 /*
1170 * Close a PACKET socket. This is fairly simple. We immediately go
1171 * to 'closed' state and remove our protocol entry in the device list.
1172 */
1173
1174 static int packet_release(struct socket *sock)
1175 {
1176 struct sock *sk = sock->sk;
1177 struct packet_sock *po;
1178 struct net *net;
1179 #ifdef CONFIG_PACKET_MMAP
1180 struct tpacket_req req;
1181 #endif
1182
1183 if (!sk)
1184 return 0;
1185
1186 net = sock_net(sk);
1187 po = pkt_sk(sk);
1188
1189 write_lock_bh(&net->packet.sklist_lock);
1190 sk_del_node_init(sk);
1191 sock_prot_inuse_add(net, sk->sk_prot, -1);
1192 write_unlock_bh(&net->packet.sklist_lock);
1193
1194 /*
1195 * Unhook packet receive handler.
1196 */
1197
1198 if (po->running) {
1199 /*
1200 * Remove the protocol hook
1201 */
1202 dev_remove_pack(&po->prot_hook);
1203 po->running = 0;
1204 po->num = 0;
1205 __sock_put(sk);
1206 }
1207
1208 packet_flush_mclist(sk);
1209
1210 #ifdef CONFIG_PACKET_MMAP
1211 memset(&req, 0, sizeof(req));
1212
1213 if (po->rx_ring.pg_vec)
1214 packet_set_ring(sk, &req, 1, 0);
1215
1216 if (po->tx_ring.pg_vec)
1217 packet_set_ring(sk, &req, 1, 1);
1218 #endif
1219
1220 /*
1221 * Now the socket is dead. No more input will appear.
1222 */
1223
1224 sock_orphan(sk);
1225 sock->sk = NULL;
1226
1227 /* Purge queues */
1228
1229 skb_queue_purge(&sk->sk_receive_queue);
1230 sk_refcnt_debug_release(sk);
1231
1232 sock_put(sk);
1233 return 0;
1234 }
1235
1236 /*
1237 * Attach a packet hook.
1238 */
1239
1240 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1241 {
1242 struct packet_sock *po = pkt_sk(sk);
1243 /*
1244 * Detach an existing hook if present.
1245 */
1246
1247 lock_sock(sk);
1248
1249 spin_lock(&po->bind_lock);
1250 if (po->running) {
1251 __sock_put(sk);
1252 po->running = 0;
1253 po->num = 0;
1254 spin_unlock(&po->bind_lock);
1255 dev_remove_pack(&po->prot_hook);
1256 spin_lock(&po->bind_lock);
1257 }
1258
1259 po->num = protocol;
1260 po->prot_hook.type = protocol;
1261 po->prot_hook.dev = dev;
1262
1263 po->ifindex = dev ? dev->ifindex : 0;
1264
1265 if (protocol == 0)
1266 goto out_unlock;
1267
1268 if (!dev || (dev->flags & IFF_UP)) {
1269 dev_add_pack(&po->prot_hook);
1270 sock_hold(sk);
1271 po->running = 1;
1272 } else {
1273 sk->sk_err = ENETDOWN;
1274 if (!sock_flag(sk, SOCK_DEAD))
1275 sk->sk_error_report(sk);
1276 }
1277
1278 out_unlock:
1279 spin_unlock(&po->bind_lock);
1280 release_sock(sk);
1281 return 0;
1282 }
1283
1284 /*
1285 * Bind a packet socket to a device
1286 */
1287
1288 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
1289 int addr_len)
1290 {
1291 struct sock *sk = sock->sk;
1292 char name[15];
1293 struct net_device *dev;
1294 int err = -ENODEV;
1295
1296 /*
1297 * Check legality
1298 */
1299
1300 if (addr_len != sizeof(struct sockaddr))
1301 return -EINVAL;
1302 strlcpy(name, uaddr->sa_data, sizeof(name));
1303
1304 dev = dev_get_by_name(sock_net(sk), name);
1305 if (dev) {
1306 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1307 dev_put(dev);
1308 }
1309 return err;
1310 }
1311
1312 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1313 {
1314 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1315 struct sock *sk = sock->sk;
1316 struct net_device *dev = NULL;
1317 int err;
1318
1319
1320 /*
1321 * Check legality
1322 */
1323
1324 if (addr_len < sizeof(struct sockaddr_ll))
1325 return -EINVAL;
1326 if (sll->sll_family != AF_PACKET)
1327 return -EINVAL;
1328
1329 if (sll->sll_ifindex) {
1330 err = -ENODEV;
1331 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1332 if (dev == NULL)
1333 goto out;
1334 }
1335 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1336 if (dev)
1337 dev_put(dev);
1338
1339 out:
1340 return err;
1341 }
1342
1343 static struct proto packet_proto = {
1344 .name = "PACKET",
1345 .owner = THIS_MODULE,
1346 .obj_size = sizeof(struct packet_sock),
1347 };
1348
1349 /*
1350 * Create a packet of type SOCK_PACKET.
1351 */
1352
1353 static int packet_create(struct net *net, struct socket *sock, int protocol)
1354 {
1355 struct sock *sk;
1356 struct packet_sock *po;
1357 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1358 int err;
1359
1360 if (!capable(CAP_NET_RAW))
1361 return -EPERM;
1362 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1363 sock->type != SOCK_PACKET)
1364 return -ESOCKTNOSUPPORT;
1365
1366 sock->state = SS_UNCONNECTED;
1367
1368 err = -ENOBUFS;
1369 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1370 if (sk == NULL)
1371 goto out;
1372
1373 sock->ops = &packet_ops;
1374 if (sock->type == SOCK_PACKET)
1375 sock->ops = &packet_ops_spkt;
1376
1377 sock_init_data(sock, sk);
1378
1379 po = pkt_sk(sk);
1380 sk->sk_family = PF_PACKET;
1381 po->num = proto;
1382
1383 sk->sk_destruct = packet_sock_destruct;
1384 sk_refcnt_debug_inc(sk);
1385
1386 /*
1387 * Attach a protocol block
1388 */
1389
1390 spin_lock_init(&po->bind_lock);
1391 mutex_init(&po->pg_vec_lock);
1392 po->prot_hook.func = packet_rcv;
1393
1394 if (sock->type == SOCK_PACKET)
1395 po->prot_hook.func = packet_rcv_spkt;
1396
1397 po->prot_hook.af_packet_priv = sk;
1398
1399 if (proto) {
1400 po->prot_hook.type = proto;
1401 dev_add_pack(&po->prot_hook);
1402 sock_hold(sk);
1403 po->running = 1;
1404 }
1405
1406 write_lock_bh(&net->packet.sklist_lock);
1407 sk_add_node(sk, &net->packet.sklist);
1408 sock_prot_inuse_add(net, &packet_proto, 1);
1409 write_unlock_bh(&net->packet.sklist_lock);
1410 return 0;
1411 out:
1412 return err;
1413 }
1414
1415 /*
1416 * Pull a packet from our receive queue and hand it to the user.
1417 * If necessary we block.
1418 */
1419
1420 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1421 struct msghdr *msg, size_t len, int flags)
1422 {
1423 struct sock *sk = sock->sk;
1424 struct sk_buff *skb;
1425 int copied, err;
1426 struct sockaddr_ll *sll;
1427
1428 err = -EINVAL;
1429 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
1430 goto out;
1431
1432 #if 0
1433 /* What error should we return now? EUNATTACH? */
1434 if (pkt_sk(sk)->ifindex < 0)
1435 return -ENODEV;
1436 #endif
1437
1438 /*
1439 * Call the generic datagram receiver. This handles all sorts
1440 * of horrible races and re-entrancy so we can forget about it
1441 * in the protocol layers.
1442 *
1443 * Now it will return ENETDOWN, if device have just gone down,
1444 * but then it will block.
1445 */
1446
1447 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1448
1449 /*
1450 * An error occurred so return it. Because skb_recv_datagram()
1451 * handles the blocking we don't see and worry about blocking
1452 * retries.
1453 */
1454
1455 if (skb == NULL)
1456 goto out;
1457
1458 /*
1459 * If the address length field is there to be filled in, we fill
1460 * it in now.
1461 */
1462
1463 sll = &PACKET_SKB_CB(skb)->sa.ll;
1464 if (sock->type == SOCK_PACKET)
1465 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1466 else
1467 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1468
1469 /*
1470 * You lose any data beyond the buffer you gave. If it worries a
1471 * user program they can ask the device for its MTU anyway.
1472 */
1473
1474 copied = skb->len;
1475 if (copied > len) {
1476 copied = len;
1477 msg->msg_flags |= MSG_TRUNC;
1478 }
1479
1480 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1481 if (err)
1482 goto out_free;
1483
1484 sock_recv_timestamp(msg, sk, skb);
1485
1486 if (msg->msg_name)
1487 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1488 msg->msg_namelen);
1489
1490 if (pkt_sk(sk)->auxdata) {
1491 struct tpacket_auxdata aux;
1492
1493 aux.tp_status = TP_STATUS_USER;
1494 if (skb->ip_summed == CHECKSUM_PARTIAL)
1495 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1496 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1497 aux.tp_snaplen = skb->len;
1498 aux.tp_mac = 0;
1499 aux.tp_net = skb_network_offset(skb);
1500 aux.tp_vlan_tci = skb->vlan_tci;
1501
1502 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1503 }
1504
1505 /*
1506 * Free or return the buffer as appropriate. Again this
1507 * hides all the races and re-entrancy issues from us.
1508 */
1509 err = (flags&MSG_TRUNC) ? skb->len : copied;
1510
1511 out_free:
1512 skb_free_datagram(sk, skb);
1513 out:
1514 return err;
1515 }
1516
1517 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1518 int *uaddr_len, int peer)
1519 {
1520 struct net_device *dev;
1521 struct sock *sk = sock->sk;
1522
1523 if (peer)
1524 return -EOPNOTSUPP;
1525
1526 uaddr->sa_family = AF_PACKET;
1527 dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex);
1528 if (dev) {
1529 strlcpy(uaddr->sa_data, dev->name, 15);
1530 dev_put(dev);
1531 } else
1532 memset(uaddr->sa_data, 0, 14);
1533 *uaddr_len = sizeof(*uaddr);
1534
1535 return 0;
1536 }
1537
1538 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1539 int *uaddr_len, int peer)
1540 {
1541 struct net_device *dev;
1542 struct sock *sk = sock->sk;
1543 struct packet_sock *po = pkt_sk(sk);
1544 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1545
1546 if (peer)
1547 return -EOPNOTSUPP;
1548
1549 sll->sll_family = AF_PACKET;
1550 sll->sll_ifindex = po->ifindex;
1551 sll->sll_protocol = po->num;
1552 dev = dev_get_by_index(sock_net(sk), po->ifindex);
1553 if (dev) {
1554 sll->sll_hatype = dev->type;
1555 sll->sll_halen = dev->addr_len;
1556 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1557 dev_put(dev);
1558 } else {
1559 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1560 sll->sll_halen = 0;
1561 }
1562 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1563
1564 return 0;
1565 }
1566
1567 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1568 int what)
1569 {
1570 switch (i->type) {
1571 case PACKET_MR_MULTICAST:
1572 if (what > 0)
1573 return dev_mc_add(dev, i->addr, i->alen, 0);
1574 else
1575 return dev_mc_delete(dev, i->addr, i->alen, 0);
1576 break;
1577 case PACKET_MR_PROMISC:
1578 return dev_set_promiscuity(dev, what);
1579 break;
1580 case PACKET_MR_ALLMULTI:
1581 return dev_set_allmulti(dev, what);
1582 break;
1583 case PACKET_MR_UNICAST:
1584 if (what > 0)
1585 return dev_unicast_add(dev, i->addr);
1586 else
1587 return dev_unicast_delete(dev, i->addr);
1588 break;
1589 default:
1590 break;
1591 }
1592 return 0;
1593 }
1594
1595 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1596 {
1597 for ( ; i; i = i->next) {
1598 if (i->ifindex == dev->ifindex)
1599 packet_dev_mc(dev, i, what);
1600 }
1601 }
1602
1603 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1604 {
1605 struct packet_sock *po = pkt_sk(sk);
1606 struct packet_mclist *ml, *i;
1607 struct net_device *dev;
1608 int err;
1609
1610 rtnl_lock();
1611
1612 err = -ENODEV;
1613 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1614 if (!dev)
1615 goto done;
1616
1617 err = -EINVAL;
1618 if (mreq->mr_alen > dev->addr_len)
1619 goto done;
1620
1621 err = -ENOBUFS;
1622 i = kmalloc(sizeof(*i), GFP_KERNEL);
1623 if (i == NULL)
1624 goto done;
1625
1626 err = 0;
1627 for (ml = po->mclist; ml; ml = ml->next) {
1628 if (ml->ifindex == mreq->mr_ifindex &&
1629 ml->type == mreq->mr_type &&
1630 ml->alen == mreq->mr_alen &&
1631 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1632 ml->count++;
1633 /* Free the new element ... */
1634 kfree(i);
1635 goto done;
1636 }
1637 }
1638
1639 i->type = mreq->mr_type;
1640 i->ifindex = mreq->mr_ifindex;
1641 i->alen = mreq->mr_alen;
1642 memcpy(i->addr, mreq->mr_address, i->alen);
1643 i->count = 1;
1644 i->next = po->mclist;
1645 po->mclist = i;
1646 err = packet_dev_mc(dev, i, 1);
1647 if (err) {
1648 po->mclist = i->next;
1649 kfree(i);
1650 }
1651
1652 done:
1653 rtnl_unlock();
1654 return err;
1655 }
1656
1657 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1658 {
1659 struct packet_mclist *ml, **mlp;
1660
1661 rtnl_lock();
1662
1663 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1664 if (ml->ifindex == mreq->mr_ifindex &&
1665 ml->type == mreq->mr_type &&
1666 ml->alen == mreq->mr_alen &&
1667 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1668 if (--ml->count == 0) {
1669 struct net_device *dev;
1670 *mlp = ml->next;
1671 dev = dev_get_by_index(sock_net(sk), ml->ifindex);
1672 if (dev) {
1673 packet_dev_mc(dev, ml, -1);
1674 dev_put(dev);
1675 }
1676 kfree(ml);
1677 }
1678 rtnl_unlock();
1679 return 0;
1680 }
1681 }
1682 rtnl_unlock();
1683 return -EADDRNOTAVAIL;
1684 }
1685
1686 static void packet_flush_mclist(struct sock *sk)
1687 {
1688 struct packet_sock *po = pkt_sk(sk);
1689 struct packet_mclist *ml;
1690
1691 if (!po->mclist)
1692 return;
1693
1694 rtnl_lock();
1695 while ((ml = po->mclist) != NULL) {
1696 struct net_device *dev;
1697
1698 po->mclist = ml->next;
1699 dev = dev_get_by_index(sock_net(sk), ml->ifindex);
1700 if (dev != NULL) {
1701 packet_dev_mc(dev, ml, -1);
1702 dev_put(dev);
1703 }
1704 kfree(ml);
1705 }
1706 rtnl_unlock();
1707 }
1708
1709 static int
1710 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1711 {
1712 struct sock *sk = sock->sk;
1713 struct packet_sock *po = pkt_sk(sk);
1714 int ret;
1715
1716 if (level != SOL_PACKET)
1717 return -ENOPROTOOPT;
1718
1719 switch (optname) {
1720 case PACKET_ADD_MEMBERSHIP:
1721 case PACKET_DROP_MEMBERSHIP:
1722 {
1723 struct packet_mreq_max mreq;
1724 int len = optlen;
1725 memset(&mreq, 0, sizeof(mreq));
1726 if (len < sizeof(struct packet_mreq))
1727 return -EINVAL;
1728 if (len > sizeof(mreq))
1729 len = sizeof(mreq);
1730 if (copy_from_user(&mreq, optval, len))
1731 return -EFAULT;
1732 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1733 return -EINVAL;
1734 if (optname == PACKET_ADD_MEMBERSHIP)
1735 ret = packet_mc_add(sk, &mreq);
1736 else
1737 ret = packet_mc_drop(sk, &mreq);
1738 return ret;
1739 }
1740
1741 #ifdef CONFIG_PACKET_MMAP
1742 case PACKET_RX_RING:
1743 case PACKET_TX_RING:
1744 {
1745 struct tpacket_req req;
1746
1747 if (optlen < sizeof(req))
1748 return -EINVAL;
1749 if (copy_from_user(&req, optval, sizeof(req)))
1750 return -EFAULT;
1751 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
1752 }
1753 case PACKET_COPY_THRESH:
1754 {
1755 int val;
1756
1757 if (optlen != sizeof(val))
1758 return -EINVAL;
1759 if (copy_from_user(&val, optval, sizeof(val)))
1760 return -EFAULT;
1761
1762 pkt_sk(sk)->copy_thresh = val;
1763 return 0;
1764 }
1765 case PACKET_VERSION:
1766 {
1767 int val;
1768
1769 if (optlen != sizeof(val))
1770 return -EINVAL;
1771 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1772 return -EBUSY;
1773 if (copy_from_user(&val, optval, sizeof(val)))
1774 return -EFAULT;
1775 switch (val) {
1776 case TPACKET_V1:
1777 case TPACKET_V2:
1778 po->tp_version = val;
1779 return 0;
1780 default:
1781 return -EINVAL;
1782 }
1783 }
1784 case PACKET_RESERVE:
1785 {
1786 unsigned int val;
1787
1788 if (optlen != sizeof(val))
1789 return -EINVAL;
1790 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1791 return -EBUSY;
1792 if (copy_from_user(&val, optval, sizeof(val)))
1793 return -EFAULT;
1794 po->tp_reserve = val;
1795 return 0;
1796 }
1797 case PACKET_LOSS:
1798 {
1799 unsigned int val;
1800
1801 if (optlen != sizeof(val))
1802 return -EINVAL;
1803 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1804 return -EBUSY;
1805 if (copy_from_user(&val, optval, sizeof(val)))
1806 return -EFAULT;
1807 po->tp_loss = !!val;
1808 return 0;
1809 }
1810 #endif
1811 case PACKET_AUXDATA:
1812 {
1813 int val;
1814
1815 if (optlen < sizeof(val))
1816 return -EINVAL;
1817 if (copy_from_user(&val, optval, sizeof(val)))
1818 return -EFAULT;
1819
1820 po->auxdata = !!val;
1821 return 0;
1822 }
1823 case PACKET_ORIGDEV:
1824 {
1825 int val;
1826
1827 if (optlen < sizeof(val))
1828 return -EINVAL;
1829 if (copy_from_user(&val, optval, sizeof(val)))
1830 return -EFAULT;
1831
1832 po->origdev = !!val;
1833 return 0;
1834 }
1835 default:
1836 return -ENOPROTOOPT;
1837 }
1838 }
1839
1840 static int packet_getsockopt(struct socket *sock, int level, int optname,
1841 char __user *optval, int __user *optlen)
1842 {
1843 int len;
1844 int val;
1845 struct sock *sk = sock->sk;
1846 struct packet_sock *po = pkt_sk(sk);
1847 void *data;
1848 struct tpacket_stats st;
1849
1850 if (level != SOL_PACKET)
1851 return -ENOPROTOOPT;
1852
1853 if (get_user(len, optlen))
1854 return -EFAULT;
1855
1856 if (len < 0)
1857 return -EINVAL;
1858
1859 switch (optname) {
1860 case PACKET_STATISTICS:
1861 if (len > sizeof(struct tpacket_stats))
1862 len = sizeof(struct tpacket_stats);
1863 spin_lock_bh(&sk->sk_receive_queue.lock);
1864 st = po->stats;
1865 memset(&po->stats, 0, sizeof(st));
1866 spin_unlock_bh(&sk->sk_receive_queue.lock);
1867 st.tp_packets += st.tp_drops;
1868
1869 data = &st;
1870 break;
1871 case PACKET_AUXDATA:
1872 if (len > sizeof(int))
1873 len = sizeof(int);
1874 val = po->auxdata;
1875
1876 data = &val;
1877 break;
1878 case PACKET_ORIGDEV:
1879 if (len > sizeof(int))
1880 len = sizeof(int);
1881 val = po->origdev;
1882
1883 data = &val;
1884 break;
1885 #ifdef CONFIG_PACKET_MMAP
1886 case PACKET_VERSION:
1887 if (len > sizeof(int))
1888 len = sizeof(int);
1889 val = po->tp_version;
1890 data = &val;
1891 break;
1892 case PACKET_HDRLEN:
1893 if (len > sizeof(int))
1894 len = sizeof(int);
1895 if (copy_from_user(&val, optval, len))
1896 return -EFAULT;
1897 switch (val) {
1898 case TPACKET_V1:
1899 val = sizeof(struct tpacket_hdr);
1900 break;
1901 case TPACKET_V2:
1902 val = sizeof(struct tpacket2_hdr);
1903 break;
1904 default:
1905 return -EINVAL;
1906 }
1907 data = &val;
1908 break;
1909 case PACKET_RESERVE:
1910 if (len > sizeof(unsigned int))
1911 len = sizeof(unsigned int);
1912 val = po->tp_reserve;
1913 data = &val;
1914 break;
1915 case PACKET_LOSS:
1916 if (len > sizeof(unsigned int))
1917 len = sizeof(unsigned int);
1918 val = po->tp_loss;
1919 data = &val;
1920 break;
1921 #endif
1922 default:
1923 return -ENOPROTOOPT;
1924 }
1925
1926 if (put_user(len, optlen))
1927 return -EFAULT;
1928 if (copy_to_user(optval, data, len))
1929 return -EFAULT;
1930 return 0;
1931 }
1932
1933
1934 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
1935 {
1936 struct sock *sk;
1937 struct hlist_node *node;
1938 struct net_device *dev = data;
1939 struct net *net = dev_net(dev);
1940
1941 read_lock(&net->packet.sklist_lock);
1942 sk_for_each(sk, node, &net->packet.sklist) {
1943 struct packet_sock *po = pkt_sk(sk);
1944
1945 switch (msg) {
1946 case NETDEV_UNREGISTER:
1947 if (po->mclist)
1948 packet_dev_mclist(dev, po->mclist, -1);
1949 /* fallthrough */
1950
1951 case NETDEV_DOWN:
1952 if (dev->ifindex == po->ifindex) {
1953 spin_lock(&po->bind_lock);
1954 if (po->running) {
1955 __dev_remove_pack(&po->prot_hook);
1956 __sock_put(sk);
1957 po->running = 0;
1958 sk->sk_err = ENETDOWN;
1959 if (!sock_flag(sk, SOCK_DEAD))
1960 sk->sk_error_report(sk);
1961 }
1962 if (msg == NETDEV_UNREGISTER) {
1963 po->ifindex = -1;
1964 po->prot_hook.dev = NULL;
1965 }
1966 spin_unlock(&po->bind_lock);
1967 }
1968 break;
1969 case NETDEV_UP:
1970 spin_lock(&po->bind_lock);
1971 if (dev->ifindex == po->ifindex && po->num &&
1972 !po->running) {
1973 dev_add_pack(&po->prot_hook);
1974 sock_hold(sk);
1975 po->running = 1;
1976 }
1977 spin_unlock(&po->bind_lock);
1978 break;
1979 }
1980 }
1981 read_unlock(&net->packet.sklist_lock);
1982 return NOTIFY_DONE;
1983 }
1984
1985
1986 static int packet_ioctl(struct socket *sock, unsigned int cmd,
1987 unsigned long arg)
1988 {
1989 struct sock *sk = sock->sk;
1990
1991 switch (cmd) {
1992 case SIOCOUTQ:
1993 {
1994 int amount = sk_wmem_alloc_get(sk);
1995
1996 return put_user(amount, (int __user *)arg);
1997 }
1998 case SIOCINQ:
1999 {
2000 struct sk_buff *skb;
2001 int amount = 0;
2002
2003 spin_lock_bh(&sk->sk_receive_queue.lock);
2004 skb = skb_peek(&sk->sk_receive_queue);
2005 if (skb)
2006 amount = skb->len;
2007 spin_unlock_bh(&sk->sk_receive_queue.lock);
2008 return put_user(amount, (int __user *)arg);
2009 }
2010 case SIOCGSTAMP:
2011 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2012 case SIOCGSTAMPNS:
2013 return sock_get_timestampns(sk, (struct timespec __user *)arg);
2014
2015 #ifdef CONFIG_INET
2016 case SIOCADDRT:
2017 case SIOCDELRT:
2018 case SIOCDARP:
2019 case SIOCGARP:
2020 case SIOCSARP:
2021 case SIOCGIFADDR:
2022 case SIOCSIFADDR:
2023 case SIOCGIFBRDADDR:
2024 case SIOCSIFBRDADDR:
2025 case SIOCGIFNETMASK:
2026 case SIOCSIFNETMASK:
2027 case SIOCGIFDSTADDR:
2028 case SIOCSIFDSTADDR:
2029 case SIOCSIFFLAGS:
2030 if (!net_eq(sock_net(sk), &init_net))
2031 return -ENOIOCTLCMD;
2032 return inet_dgram_ops.ioctl(sock, cmd, arg);
2033 #endif
2034
2035 default:
2036 return -ENOIOCTLCMD;
2037 }
2038 return 0;
2039 }
2040
2041 #ifndef CONFIG_PACKET_MMAP
2042 #define packet_mmap sock_no_mmap
2043 #define packet_poll datagram_poll
2044 #else
2045
2046 static unsigned int packet_poll(struct file *file, struct socket *sock,
2047 poll_table *wait)
2048 {
2049 struct sock *sk = sock->sk;
2050 struct packet_sock *po = pkt_sk(sk);
2051 unsigned int mask = datagram_poll(file, sock, wait);
2052
2053 spin_lock_bh(&sk->sk_receive_queue.lock);
2054 if (po->rx_ring.pg_vec) {
2055 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
2056 mask |= POLLIN | POLLRDNORM;
2057 }
2058 spin_unlock_bh(&sk->sk_receive_queue.lock);
2059 spin_lock_bh(&sk->sk_write_queue.lock);
2060 if (po->tx_ring.pg_vec) {
2061 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2062 mask |= POLLOUT | POLLWRNORM;
2063 }
2064 spin_unlock_bh(&sk->sk_write_queue.lock);
2065 return mask;
2066 }
2067
2068
2069 /* Dirty? Well, I still did not learn better way to account
2070 * for user mmaps.
2071 */
2072
2073 static void packet_mm_open(struct vm_area_struct *vma)
2074 {
2075 struct file *file = vma->vm_file;
2076 struct socket *sock = file->private_data;
2077 struct sock *sk = sock->sk;
2078
2079 if (sk)
2080 atomic_inc(&pkt_sk(sk)->mapped);
2081 }
2082
2083 static void packet_mm_close(struct vm_area_struct *vma)
2084 {
2085 struct file *file = vma->vm_file;
2086 struct socket *sock = file->private_data;
2087 struct sock *sk = sock->sk;
2088
2089 if (sk)
2090 atomic_dec(&pkt_sk(sk)->mapped);
2091 }
2092
2093 static const struct vm_operations_struct packet_mmap_ops = {
2094 .open = packet_mm_open,
2095 .close = packet_mm_close,
2096 };
2097
2098 static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
2099 {
2100 int i;
2101
2102 for (i = 0; i < len; i++) {
2103 if (likely(pg_vec[i]))
2104 free_pages((unsigned long) pg_vec[i], order);
2105 }
2106 kfree(pg_vec);
2107 }
2108
2109 static inline char *alloc_one_pg_vec_page(unsigned long order)
2110 {
2111 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;
2112
2113 return (char *) __get_free_pages(gfp_flags, order);
2114 }
2115
2116 static char **alloc_pg_vec(struct tpacket_req *req, int order)
2117 {
2118 unsigned int block_nr = req->tp_block_nr;
2119 char **pg_vec;
2120 int i;
2121
2122 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
2123 if (unlikely(!pg_vec))
2124 goto out;
2125
2126 for (i = 0; i < block_nr; i++) {
2127 pg_vec[i] = alloc_one_pg_vec_page(order);
2128 if (unlikely(!pg_vec[i]))
2129 goto out_free_pgvec;
2130 }
2131
2132 out:
2133 return pg_vec;
2134
2135 out_free_pgvec:
2136 free_pg_vec(pg_vec, order, block_nr);
2137 pg_vec = NULL;
2138 goto out;
2139 }
2140
2141 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2142 int closing, int tx_ring)
2143 {
2144 char **pg_vec = NULL;
2145 struct packet_sock *po = pkt_sk(sk);
2146 int was_running, order = 0;
2147 struct packet_ring_buffer *rb;
2148 struct sk_buff_head *rb_queue;
2149 __be16 num;
2150 int err;
2151
2152 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2153 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2154
2155 err = -EBUSY;
2156 if (!closing) {
2157 if (atomic_read(&po->mapped))
2158 goto out;
2159 if (atomic_read(&rb->pending))
2160 goto out;
2161 }
2162
2163 if (req->tp_block_nr) {
2164 /* Sanity tests and some calculations */
2165 err = -EBUSY;
2166 if (unlikely(rb->pg_vec))
2167 goto out;
2168
2169 switch (po->tp_version) {
2170 case TPACKET_V1:
2171 po->tp_hdrlen = TPACKET_HDRLEN;
2172 break;
2173 case TPACKET_V2:
2174 po->tp_hdrlen = TPACKET2_HDRLEN;
2175 break;
2176 }
2177
2178 err = -EINVAL;
2179 if (unlikely((int)req->tp_block_size <= 0))
2180 goto out;
2181 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
2182 goto out;
2183 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
2184 po->tp_reserve))
2185 goto out;
2186 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
2187 goto out;
2188
2189 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2190 if (unlikely(rb->frames_per_block <= 0))
2191 goto out;
2192 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2193 req->tp_frame_nr))
2194 goto out;
2195
2196 err = -ENOMEM;
2197 order = get_order(req->tp_block_size);
2198 pg_vec = alloc_pg_vec(req, order);
2199 if (unlikely(!pg_vec))
2200 goto out;
2201 }
2202 /* Done */
2203 else {
2204 err = -EINVAL;
2205 if (unlikely(req->tp_frame_nr))
2206 goto out;
2207 }
2208
2209 lock_sock(sk);
2210
2211 /* Detach socket from network */
2212 spin_lock(&po->bind_lock);
2213 was_running = po->running;
2214 num = po->num;
2215 if (was_running) {
2216 __dev_remove_pack(&po->prot_hook);
2217 po->num = 0;
2218 po->running = 0;
2219 __sock_put(sk);
2220 }
2221 spin_unlock(&po->bind_lock);
2222
2223 synchronize_net();
2224
2225 err = -EBUSY;
2226 mutex_lock(&po->pg_vec_lock);
2227 if (closing || atomic_read(&po->mapped) == 0) {
2228 err = 0;
2229 #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
2230 spin_lock_bh(&rb_queue->lock);
2231 pg_vec = XC(rb->pg_vec, pg_vec);
2232 rb->frame_max = (req->tp_frame_nr - 1);
2233 rb->head = 0;
2234 rb->frame_size = req->tp_frame_size;
2235 spin_unlock_bh(&rb_queue->lock);
2236
2237 order = XC(rb->pg_vec_order, order);
2238 req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr);
2239
2240 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2241 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2242 tpacket_rcv : packet_rcv;
2243 skb_queue_purge(rb_queue);
2244 #undef XC
2245 if (atomic_read(&po->mapped))
2246 pr_err("packet_mmap: vma is busy: %d\n",
2247 atomic_read(&po->mapped));
2248 }
2249 mutex_unlock(&po->pg_vec_lock);
2250
2251 spin_lock(&po->bind_lock);
2252 if (was_running && !po->running) {
2253 sock_hold(sk);
2254 po->running = 1;
2255 po->num = num;
2256 dev_add_pack(&po->prot_hook);
2257 }
2258 spin_unlock(&po->bind_lock);
2259
2260 release_sock(sk);
2261
2262 if (pg_vec)
2263 free_pg_vec(pg_vec, order, req->tp_block_nr);
2264 out:
2265 return err;
2266 }
2267
2268 static int packet_mmap(struct file *file, struct socket *sock,
2269 struct vm_area_struct *vma)
2270 {
2271 struct sock *sk = sock->sk;
2272 struct packet_sock *po = pkt_sk(sk);
2273 unsigned long size, expected_size;
2274 struct packet_ring_buffer *rb;
2275 unsigned long start;
2276 int err = -EINVAL;
2277 int i;
2278
2279 if (vma->vm_pgoff)
2280 return -EINVAL;
2281
2282 mutex_lock(&po->pg_vec_lock);
2283
2284 expected_size = 0;
2285 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2286 if (rb->pg_vec) {
2287 expected_size += rb->pg_vec_len
2288 * rb->pg_vec_pages
2289 * PAGE_SIZE;
2290 }
2291 }
2292
2293 if (expected_size == 0)
2294 goto out;
2295
2296 size = vma->vm_end - vma->vm_start;
2297 if (size != expected_size)
2298 goto out;
2299
2300 start = vma->vm_start;
2301 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2302 if (rb->pg_vec == NULL)
2303 continue;
2304
2305 for (i = 0; i < rb->pg_vec_len; i++) {
2306 struct page *page = virt_to_page(rb->pg_vec[i]);
2307 int pg_num;
2308
2309 for (pg_num = 0; pg_num < rb->pg_vec_pages;
2310 pg_num++, page++) {
2311 err = vm_insert_page(vma, start, page);
2312 if (unlikely(err))
2313 goto out;
2314 start += PAGE_SIZE;
2315 }
2316 }
2317 }
2318
2319 atomic_inc(&po->mapped);
2320 vma->vm_ops = &packet_mmap_ops;
2321 err = 0;
2322
2323 out:
2324 mutex_unlock(&po->pg_vec_lock);
2325 return err;
2326 }
2327 #endif
2328
2329
2330 static const struct proto_ops packet_ops_spkt = {
2331 .family = PF_PACKET,
2332 .owner = THIS_MODULE,
2333 .release = packet_release,
2334 .bind = packet_bind_spkt,
2335 .connect = sock_no_connect,
2336 .socketpair = sock_no_socketpair,
2337 .accept = sock_no_accept,
2338 .getname = packet_getname_spkt,
2339 .poll = datagram_poll,
2340 .ioctl = packet_ioctl,
2341 .listen = sock_no_listen,
2342 .shutdown = sock_no_shutdown,
2343 .setsockopt = sock_no_setsockopt,
2344 .getsockopt = sock_no_getsockopt,
2345 .sendmsg = packet_sendmsg_spkt,
2346 .recvmsg = packet_recvmsg,
2347 .mmap = sock_no_mmap,
2348 .sendpage = sock_no_sendpage,
2349 };
2350
2351 static const struct proto_ops packet_ops = {
2352 .family = PF_PACKET,
2353 .owner = THIS_MODULE,
2354 .release = packet_release,
2355 .bind = packet_bind,
2356 .connect = sock_no_connect,
2357 .socketpair = sock_no_socketpair,
2358 .accept = sock_no_accept,
2359 .getname = packet_getname,
2360 .poll = packet_poll,
2361 .ioctl = packet_ioctl,
2362 .listen = sock_no_listen,
2363 .shutdown = sock_no_shutdown,
2364 .setsockopt = packet_setsockopt,
2365 .getsockopt = packet_getsockopt,
2366 .sendmsg = packet_sendmsg,
2367 .recvmsg = packet_recvmsg,
2368 .mmap = packet_mmap,
2369 .sendpage = sock_no_sendpage,
2370 };
2371
2372 static struct net_proto_family packet_family_ops = {
2373 .family = PF_PACKET,
2374 .create = packet_create,
2375 .owner = THIS_MODULE,
2376 };
2377
2378 static struct notifier_block packet_netdev_notifier = {
2379 .notifier_call = packet_notifier,
2380 };
2381
2382 #ifdef CONFIG_PROC_FS
2383 static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
2384 {
2385 struct sock *s;
2386 struct hlist_node *node;
2387
2388 sk_for_each(s, node, &net->packet.sklist) {
2389 if (!off--)
2390 return s;
2391 }
2392 return NULL;
2393 }
2394
2395 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2396 __acquires(seq_file_net(seq)->packet.sklist_lock)
2397 {
2398 struct net *net = seq_file_net(seq);
2399 read_lock(&net->packet.sklist_lock);
2400 return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
2401 }
2402
2403 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2404 {
2405 struct net *net = seq_file_net(seq);
2406 ++*pos;
2407 return (v == SEQ_START_TOKEN)
2408 ? sk_head(&net->packet.sklist)
2409 : sk_next((struct sock *)v) ;
2410 }
2411
2412 static void packet_seq_stop(struct seq_file *seq, void *v)
2413 __releases(seq_file_net(seq)->packet.sklist_lock)
2414 {
2415 struct net *net = seq_file_net(seq);
2416 read_unlock(&net->packet.sklist_lock);
2417 }
2418
2419 static int packet_seq_show(struct seq_file *seq, void *v)
2420 {
2421 if (v == SEQ_START_TOKEN)
2422 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2423 else {
2424 struct sock *s = v;
2425 const struct packet_sock *po = pkt_sk(s);
2426
2427 seq_printf(seq,
2428 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2429 s,
2430 atomic_read(&s->sk_refcnt),
2431 s->sk_type,
2432 ntohs(po->num),
2433 po->ifindex,
2434 po->running,
2435 atomic_read(&s->sk_rmem_alloc),
2436 sock_i_uid(s),
2437 sock_i_ino(s));
2438 }
2439
2440 return 0;
2441 }
2442
2443 static const struct seq_operations packet_seq_ops = {
2444 .start = packet_seq_start,
2445 .next = packet_seq_next,
2446 .stop = packet_seq_stop,
2447 .show = packet_seq_show,
2448 };
2449
2450 static int packet_seq_open(struct inode *inode, struct file *file)
2451 {
2452 return seq_open_net(inode, file, &packet_seq_ops,
2453 sizeof(struct seq_net_private));
2454 }
2455
2456 static const struct file_operations packet_seq_fops = {
2457 .owner = THIS_MODULE,
2458 .open = packet_seq_open,
2459 .read = seq_read,
2460 .llseek = seq_lseek,
2461 .release = seq_release_net,
2462 };
2463
2464 #endif
2465
2466 static int packet_net_init(struct net *net)
2467 {
2468 rwlock_init(&net->packet.sklist_lock);
2469 INIT_HLIST_HEAD(&net->packet.sklist);
2470
2471 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2472 return -ENOMEM;
2473
2474 return 0;
2475 }
2476
2477 static void packet_net_exit(struct net *net)
2478 {
2479 proc_net_remove(net, "packet");
2480 }
2481
2482 static struct pernet_operations packet_net_ops = {
2483 .init = packet_net_init,
2484 .exit = packet_net_exit,
2485 };
2486
2487
2488 static void __exit packet_exit(void)
2489 {
2490 unregister_netdevice_notifier(&packet_netdev_notifier);
2491 unregister_pernet_subsys(&packet_net_ops);
2492 sock_unregister(PF_PACKET);
2493 proto_unregister(&packet_proto);
2494 }
2495
2496 static int __init packet_init(void)
2497 {
2498 int rc = proto_register(&packet_proto, 0);
2499
2500 if (rc != 0)
2501 goto out;
2502
2503 sock_register(&packet_family_ops);
2504 register_pernet_subsys(&packet_net_ops);
2505 register_netdevice_notifier(&packet_netdev_notifier);
2506 out:
2507 return rc;
2508 }
2509
2510 module_init(packet_init);
2511 module_exit(packet_exit);
2512 MODULE_LICENSE("GPL");
2513 MODULE_ALIAS_NETPROTO(PF_PACKET);
kernels