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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
[deliverable/linux.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 {
142 struct packet_mclist *next;
143 int ifindex;
144 int count;
145 unsigned short type;
146 unsigned short alen;
147 unsigned char addr[MAX_ADDR_LEN];
148 };
149 /* identical to struct packet_mreq except it has
150 * a longer address field.
151 */
152 struct packet_mreq_max
153 {
154 int mr_ifindex;
155 unsigned short mr_type;
156 unsigned short mr_alen;
157 unsigned char mr_address[MAX_ADDR_LEN];
158 };
159
160 #ifdef CONFIG_PACKET_MMAP
161 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
162 int closing, int tx_ring);
163
164 struct packet_ring_buffer {
165 char * *pg_vec;
166 unsigned int head;
167 unsigned int frames_per_block;
168 unsigned int frame_size;
169 unsigned int frame_max;
170
171 unsigned int pg_vec_order;
172 unsigned int pg_vec_pages;
173 unsigned int pg_vec_len;
174
175 atomic_t pending;
176 };
177
178 struct packet_sock;
179 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
180 #endif
181
182 static void packet_flush_mclist(struct sock *sk);
183
184 struct packet_sock {
185 /* struct sock has to be the first member of packet_sock */
186 struct sock sk;
187 struct tpacket_stats stats;
188 #ifdef CONFIG_PACKET_MMAP
189 struct packet_ring_buffer rx_ring;
190 struct packet_ring_buffer tx_ring;
191 int copy_thresh;
192 #endif
193 struct packet_type prot_hook;
194 spinlock_t bind_lock;
195 struct mutex pg_vec_lock;
196 unsigned int running:1, /* prot_hook is attached*/
197 auxdata:1,
198 origdev:1;
199 int ifindex; /* bound device */
200 __be16 num;
201 struct packet_mclist *mclist;
202 #ifdef CONFIG_PACKET_MMAP
203 atomic_t mapped;
204 enum tpacket_versions tp_version;
205 unsigned int tp_hdrlen;
206 unsigned int tp_reserve;
207 unsigned int tp_loss:1;
208 #endif
209 };
210
211 struct packet_skb_cb {
212 unsigned int origlen;
213 union {
214 struct sockaddr_pkt pkt;
215 struct sockaddr_ll ll;
216 } sa;
217 };
218
219 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
220
221 #ifdef CONFIG_PACKET_MMAP
222
223 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
224 {
225 union {
226 struct tpacket_hdr *h1;
227 struct tpacket2_hdr *h2;
228 void *raw;
229 } h;
230
231 h.raw = frame;
232 switch (po->tp_version) {
233 case TPACKET_V1:
234 h.h1->tp_status = status;
235 flush_dcache_page(virt_to_page(&h.h1->tp_status));
236 break;
237 case TPACKET_V2:
238 h.h2->tp_status = status;
239 flush_dcache_page(virt_to_page(&h.h2->tp_status));
240 break;
241 default:
242 printk(KERN_ERR "TPACKET version not supported\n");
243 BUG();
244 }
245
246 smp_wmb();
247 }
248
249 static int __packet_get_status(struct packet_sock *po, void *frame)
250 {
251 union {
252 struct tpacket_hdr *h1;
253 struct tpacket2_hdr *h2;
254 void *raw;
255 } h;
256
257 smp_rmb();
258
259 h.raw = frame;
260 switch (po->tp_version) {
261 case TPACKET_V1:
262 flush_dcache_page(virt_to_page(&h.h1->tp_status));
263 return h.h1->tp_status;
264 case TPACKET_V2:
265 flush_dcache_page(virt_to_page(&h.h2->tp_status));
266 return h.h2->tp_status;
267 default:
268 printk(KERN_ERR "TPACKET version not supported\n");
269 BUG();
270 return 0;
271 }
272 }
273
274 static void *packet_lookup_frame(struct packet_sock *po,
275 struct packet_ring_buffer *rb,
276 unsigned int position,
277 int status)
278 {
279 unsigned int pg_vec_pos, frame_offset;
280 union {
281 struct tpacket_hdr *h1;
282 struct tpacket2_hdr *h2;
283 void *raw;
284 } h;
285
286 pg_vec_pos = position / rb->frames_per_block;
287 frame_offset = position % rb->frames_per_block;
288
289 h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size);
290
291 if (status != __packet_get_status(po, h.raw))
292 return NULL;
293
294 return h.raw;
295 }
296
297 static inline void *packet_current_frame(struct packet_sock *po,
298 struct packet_ring_buffer *rb,
299 int status)
300 {
301 return packet_lookup_frame(po, rb, rb->head, status);
302 }
303
304 static inline void *packet_previous_frame(struct packet_sock *po,
305 struct packet_ring_buffer *rb,
306 int status)
307 {
308 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
309 return packet_lookup_frame(po, rb, previous, status);
310 }
311
312 static inline void packet_increment_head(struct packet_ring_buffer *buff)
313 {
314 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
315 }
316
317 #endif
318
319 static inline struct packet_sock *pkt_sk(struct sock *sk)
320 {
321 return (struct packet_sock *)sk;
322 }
323
324 static void packet_sock_destruct(struct sock *sk)
325 {
326 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
327 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
328
329 if (!sock_flag(sk, SOCK_DEAD)) {
330 printk("Attempt to release alive packet socket: %p\n", sk);
331 return;
332 }
333
334 sk_refcnt_debug_dec(sk);
335 }
336
337
338 static const struct proto_ops packet_ops;
339
340 static const struct proto_ops packet_ops_spkt;
341
342 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
343 {
344 struct sock *sk;
345 struct sockaddr_pkt *spkt;
346
347 /*
348 * When we registered the protocol we saved the socket in the data
349 * field for just this event.
350 */
351
352 sk = pt->af_packet_priv;
353
354 /*
355 * Yank back the headers [hope the device set this
356 * right or kerboom...]
357 *
358 * Incoming packets have ll header pulled,
359 * push it back.
360 *
361 * For outgoing ones skb->data == skb_mac_header(skb)
362 * so that this procedure is noop.
363 */
364
365 if (skb->pkt_type == PACKET_LOOPBACK)
366 goto out;
367
368 if (dev_net(dev) != sock_net(sk))
369 goto out;
370
371 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == 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 {
428 if (msg->msg_namelen < sizeof(struct sockaddr))
429 return(-EINVAL);
430 if (msg->msg_namelen==sizeof(struct sockaddr_pkt))
431 proto=saddr->spkt_protocol;
432 }
433 else
434 return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */
435
436 /*
437 * Find the device first to size check it
438 */
439
440 saddr->spkt_device[13] = 0;
441 dev = dev_get_by_name(sock_net(sk), saddr->spkt_device);
442 err = -ENODEV;
443 if (dev == NULL)
444 goto out_unlock;
445
446 err = -ENETDOWN;
447 if (!(dev->flags & IFF_UP))
448 goto out_unlock;
449
450 /*
451 * You may not queue a frame bigger than the mtu. This is the lowest level
452 * raw protocol and you must do your own fragmentation at this level.
453 */
454
455 err = -EMSGSIZE;
456 if (len > dev->mtu + dev->hard_header_len)
457 goto out_unlock;
458
459 err = -ENOBUFS;
460 skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);
461
462 /*
463 * If the write buffer is full, then tough. At this level the user gets to
464 * deal with the problem - do your own algorithmic backoffs. That's far
465 * more flexible.
466 */
467
468 if (skb == NULL)
469 goto out_unlock;
470
471 /*
472 * Fill it in
473 */
474
475 /* FIXME: Save some space for broken drivers that write a
476 * hard header at transmission time by themselves. PPP is the
477 * notable one here. This should really be fixed at the driver level.
478 */
479 skb_reserve(skb, LL_RESERVED_SPACE(dev));
480 skb_reset_network_header(skb);
481
482 /* Try to align data part correctly */
483 if (dev->header_ops) {
484 skb->data -= dev->hard_header_len;
485 skb->tail -= dev->hard_header_len;
486 if (len < dev->hard_header_len)
487 skb_reset_network_header(skb);
488 }
489
490 /* Returns -EFAULT on error */
491 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
492 skb->protocol = proto;
493 skb->dev = dev;
494 skb->priority = sk->sk_priority;
495 if (err)
496 goto out_free;
497
498 /*
499 * Now send it
500 */
501
502 dev_queue_xmit(skb);
503 dev_put(dev);
504 return(len);
505
506 out_free:
507 kfree_skb(skb);
508 out_unlock:
509 if (dev)
510 dev_put(dev);
511 return err;
512 }
513
514 static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
515 unsigned int res)
516 {
517 struct sk_filter *filter;
518
519 rcu_read_lock_bh();
520 filter = rcu_dereference(sk->sk_filter);
521 if (filter != NULL)
522 res = sk_run_filter(skb, filter->insns, filter->len);
523 rcu_read_unlock_bh();
524
525 return res;
526 }
527
528 /*
529 This function makes lazy skb cloning in hope that most of packets
530 are discarded by BPF.
531
532 Note tricky part: we DO mangle shared skb! skb->data, skb->len
533 and skb->cb are mangled. It works because (and until) packets
534 falling here are owned by current CPU. Output packets are cloned
535 by dev_queue_xmit_nit(), input packets are processed by net_bh
536 sequencially, so that if we return skb to original state on exit,
537 we will not harm anyone.
538 */
539
540 static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
541 {
542 struct sock *sk;
543 struct sockaddr_ll *sll;
544 struct packet_sock *po;
545 u8 * skb_head = skb->data;
546 int skb_len = skb->len;
547 unsigned int snaplen, res;
548
549 if (skb->pkt_type == PACKET_LOOPBACK)
550 goto drop;
551
552 sk = pt->af_packet_priv;
553 po = pkt_sk(sk);
554
555 if (dev_net(dev) != sock_net(sk))
556 goto drop;
557
558 skb->dev = dev;
559
560 if (dev->header_ops) {
561 /* The device has an explicit notion of ll header,
562 exported to higher levels.
563
564 Otherwise, the device hides datails of it frame
565 structure, so that corresponding packet head
566 never delivered to user.
567 */
568 if (sk->sk_type != SOCK_DGRAM)
569 skb_push(skb, skb->data - skb_mac_header(skb));
570 else if (skb->pkt_type == PACKET_OUTGOING) {
571 /* Special case: outgoing packets have ll header at head */
572 skb_pull(skb, skb_network_offset(skb));
573 }
574 }
575
576 snaplen = skb->len;
577
578 res = run_filter(skb, sk, snaplen);
579 if (!res)
580 goto drop_n_restore;
581 if (snaplen > res)
582 snaplen = res;
583
584 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
585 (unsigned)sk->sk_rcvbuf)
586 goto drop_n_acct;
587
588 if (skb_shared(skb)) {
589 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
590 if (nskb == NULL)
591 goto drop_n_acct;
592
593 if (skb_head != skb->data) {
594 skb->data = skb_head;
595 skb->len = skb_len;
596 }
597 kfree_skb(skb);
598 skb = nskb;
599 }
600
601 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
602 sizeof(skb->cb));
603
604 sll = &PACKET_SKB_CB(skb)->sa.ll;
605 sll->sll_family = AF_PACKET;
606 sll->sll_hatype = dev->type;
607 sll->sll_protocol = skb->protocol;
608 sll->sll_pkttype = skb->pkt_type;
609 if (unlikely(po->origdev))
610 sll->sll_ifindex = orig_dev->ifindex;
611 else
612 sll->sll_ifindex = dev->ifindex;
613
614 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
615
616 PACKET_SKB_CB(skb)->origlen = skb->len;
617
618 if (pskb_trim(skb, snaplen))
619 goto drop_n_acct;
620
621 skb_set_owner_r(skb, sk);
622 skb->dev = NULL;
623 skb_dst_drop(skb);
624
625 /* drop conntrack reference */
626 nf_reset(skb);
627
628 spin_lock(&sk->sk_receive_queue.lock);
629 po->stats.tp_packets++;
630 __skb_queue_tail(&sk->sk_receive_queue, skb);
631 spin_unlock(&sk->sk_receive_queue.lock);
632 sk->sk_data_ready(sk, skb->len);
633 return 0;
634
635 drop_n_acct:
636 spin_lock(&sk->sk_receive_queue.lock);
637 po->stats.tp_drops++;
638 spin_unlock(&sk->sk_receive_queue.lock);
639
640 drop_n_restore:
641 if (skb_head != skb->data && skb_shared(skb)) {
642 skb->data = skb_head;
643 skb->len = skb_len;
644 }
645 drop:
646 consume_skb(skb);
647 return 0;
648 }
649
650 #ifdef CONFIG_PACKET_MMAP
651 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, 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 printk(KERN_ERR "packet size is too long (%d > %d)\n",
871 tp_len, size_max);
872 return -EMSGSIZE;
873 }
874
875 skb_reserve(skb, LL_RESERVED_SPACE(dev));
876 skb_reset_network_header(skb);
877
878 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
879 to_write = tp_len;
880
881 if (sock->type == SOCK_DGRAM) {
882 err = dev_hard_header(skb, dev, ntohs(proto), addr,
883 NULL, tp_len);
884 if (unlikely(err < 0))
885 return -EINVAL;
886 } else if (dev->hard_header_len ) {
887 /* net device doesn't like empty head */
888 if (unlikely(tp_len <= dev->hard_header_len)) {
889 printk(KERN_ERR "packet size is too short "
890 "(%d < %d)\n", tp_len,
891 dev->hard_header_len);
892 return -EINVAL;
893 }
894
895 skb_push(skb, dev->hard_header_len);
896 err = skb_store_bits(skb, 0, data,
897 dev->hard_header_len);
898 if (unlikely(err))
899 return err;
900
901 data += dev->hard_header_len;
902 to_write -= dev->hard_header_len;
903 }
904
905 err = -EFAULT;
906 page = virt_to_page(data);
907 offset = offset_in_page(data);
908 len_max = PAGE_SIZE - offset;
909 len = ((to_write > len_max) ? len_max : to_write);
910
911 skb->data_len = to_write;
912 skb->len += to_write;
913 skb->truesize += to_write;
914 atomic_add(to_write, &po->sk.sk_wmem_alloc);
915
916 while (likely(to_write)) {
917 nr_frags = skb_shinfo(skb)->nr_frags;
918
919 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
920 printk(KERN_ERR "Packet exceed the number "
921 "of skb frags(%lu)\n",
922 MAX_SKB_FRAGS);
923 return -EFAULT;
924 }
925
926 flush_dcache_page(page);
927 get_page(page);
928 skb_fill_page_desc(skb,
929 nr_frags,
930 page++, offset, len);
931 to_write -= len;
932 offset = 0;
933 len_max = PAGE_SIZE;
934 len = ((to_write > len_max) ? len_max : to_write);
935 }
936
937 return tp_len;
938 }
939
940 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
941 {
942 struct socket *sock;
943 struct sk_buff *skb;
944 struct net_device *dev;
945 __be16 proto;
946 int ifindex, err, reserve = 0;
947 void * ph;
948 struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name;
949 int tp_len, size_max;
950 unsigned char *addr;
951 int len_sum = 0;
952 int status = 0;
953
954 sock = po->sk.sk_socket;
955
956 mutex_lock(&po->pg_vec_lock);
957
958 err = -EBUSY;
959 if (saddr == NULL) {
960 ifindex = po->ifindex;
961 proto = po->num;
962 addr = NULL;
963 } else {
964 err = -EINVAL;
965 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
966 goto out;
967 if (msg->msg_namelen < (saddr->sll_halen
968 + offsetof(struct sockaddr_ll,
969 sll_addr)))
970 goto out;
971 ifindex = saddr->sll_ifindex;
972 proto = saddr->sll_protocol;
973 addr = saddr->sll_addr;
974 }
975
976 dev = dev_get_by_index(sock_net(&po->sk), ifindex);
977 err = -ENXIO;
978 if (unlikely(dev == NULL))
979 goto out;
980
981 reserve = dev->hard_header_len;
982
983 err = -ENETDOWN;
984 if (unlikely(!(dev->flags & IFF_UP)))
985 goto out_put;
986
987 size_max = po->tx_ring.frame_size
988 - sizeof(struct skb_shared_info)
989 - po->tp_hdrlen
990 - LL_ALLOCATED_SPACE(dev)
991 - sizeof(struct sockaddr_ll);
992
993 if (size_max > dev->mtu + reserve)
994 size_max = dev->mtu + reserve;
995
996 do {
997 ph = packet_current_frame(po, &po->tx_ring,
998 TP_STATUS_SEND_REQUEST);
999
1000 if (unlikely(ph == NULL)) {
1001 schedule();
1002 continue;
1003 }
1004
1005 status = TP_STATUS_SEND_REQUEST;
1006 skb = sock_alloc_send_skb(&po->sk,
1007 LL_ALLOCATED_SPACE(dev)
1008 + sizeof(struct sockaddr_ll),
1009 0, &err);
1010
1011 if (unlikely(skb == NULL))
1012 goto out_status;
1013
1014 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1015 addr);
1016
1017 if (unlikely(tp_len < 0)) {
1018 if (po->tp_loss) {
1019 __packet_set_status(po, ph,
1020 TP_STATUS_AVAILABLE);
1021 packet_increment_head(&po->tx_ring);
1022 kfree_skb(skb);
1023 continue;
1024 } else {
1025 status = TP_STATUS_WRONG_FORMAT;
1026 err = tp_len;
1027 goto out_status;
1028 }
1029 }
1030
1031 skb->destructor = tpacket_destruct_skb;
1032 __packet_set_status(po, ph, TP_STATUS_SENDING);
1033 atomic_inc(&po->tx_ring.pending);
1034
1035 status = TP_STATUS_SEND_REQUEST;
1036 err = dev_queue_xmit(skb);
1037 if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0))
1038 goto out_xmit;
1039 packet_increment_head(&po->tx_ring);
1040 len_sum += tp_len;
1041 }
1042 while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT))
1043 && (atomic_read(&po->tx_ring.pending))))
1044 );
1045
1046 err = len_sum;
1047 goto out_put;
1048
1049 out_xmit:
1050 skb->destructor = sock_wfree;
1051 atomic_dec(&po->tx_ring.pending);
1052 out_status:
1053 __packet_set_status(po, ph, status);
1054 kfree_skb(skb);
1055 out_put:
1056 dev_put(dev);
1057 out:
1058 mutex_unlock(&po->pg_vec_lock);
1059 return err;
1060 }
1061 #endif
1062
1063 static int packet_snd(struct socket *sock,
1064 struct msghdr *msg, size_t len)
1065 {
1066 struct sock *sk = sock->sk;
1067 struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name;
1068 struct sk_buff *skb;
1069 struct net_device *dev;
1070 __be16 proto;
1071 unsigned char *addr;
1072 int ifindex, err, reserve = 0;
1073
1074 /*
1075 * Get and verify the address.
1076 */
1077
1078 if (saddr == NULL) {
1079 struct packet_sock *po = pkt_sk(sk);
1080
1081 ifindex = po->ifindex;
1082 proto = po->num;
1083 addr = NULL;
1084 } else {
1085 err = -EINVAL;
1086 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1087 goto out;
1088 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1089 goto out;
1090 ifindex = saddr->sll_ifindex;
1091 proto = saddr->sll_protocol;
1092 addr = saddr->sll_addr;
1093 }
1094
1095
1096 dev = dev_get_by_index(sock_net(sk), ifindex);
1097 err = -ENXIO;
1098 if (dev == NULL)
1099 goto out_unlock;
1100 if (sock->type == SOCK_RAW)
1101 reserve = dev->hard_header_len;
1102
1103 err = -ENETDOWN;
1104 if (!(dev->flags & IFF_UP))
1105 goto out_unlock;
1106
1107 err = -EMSGSIZE;
1108 if (len > dev->mtu+reserve)
1109 goto out_unlock;
1110
1111 skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
1112 msg->msg_flags & MSG_DONTWAIT, &err);
1113 if (skb==NULL)
1114 goto out_unlock;
1115
1116 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1117 skb_reset_network_header(skb);
1118
1119 err = -EINVAL;
1120 if (sock->type == SOCK_DGRAM &&
1121 dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
1122 goto out_free;
1123
1124 /* Returns -EFAULT on error */
1125 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
1126 if (err)
1127 goto out_free;
1128
1129 skb->protocol = proto;
1130 skb->dev = dev;
1131 skb->priority = sk->sk_priority;
1132
1133 /*
1134 * Now send it
1135 */
1136
1137 err = dev_queue_xmit(skb);
1138 if (err > 0 && (err = net_xmit_errno(err)) != 0)
1139 goto out_unlock;
1140
1141 dev_put(dev);
1142
1143 return(len);
1144
1145 out_free:
1146 kfree_skb(skb);
1147 out_unlock:
1148 if (dev)
1149 dev_put(dev);
1150 out:
1151 return err;
1152 }
1153
1154 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1155 struct msghdr *msg, size_t len)
1156 {
1157 #ifdef CONFIG_PACKET_MMAP
1158 struct sock *sk = sock->sk;
1159 struct packet_sock *po = pkt_sk(sk);
1160 if (po->tx_ring.pg_vec)
1161 return tpacket_snd(po, msg);
1162 else
1163 #endif
1164 return packet_snd(sock, msg, len);
1165 }
1166
1167 /*
1168 * Close a PACKET socket. This is fairly simple. We immediately go
1169 * to 'closed' state and remove our protocol entry in the device list.
1170 */
1171
1172 static int packet_release(struct socket *sock)
1173 {
1174 struct sock *sk = sock->sk;
1175 struct packet_sock *po;
1176 struct net *net;
1177 #ifdef CONFIG_PACKET_MMAP
1178 struct tpacket_req req;
1179 #endif
1180
1181 if (!sk)
1182 return 0;
1183
1184 net = sock_net(sk);
1185 po = pkt_sk(sk);
1186
1187 write_lock_bh(&net->packet.sklist_lock);
1188 sk_del_node_init(sk);
1189 sock_prot_inuse_add(net, sk->sk_prot, -1);
1190 write_unlock_bh(&net->packet.sklist_lock);
1191
1192 /*
1193 * Unhook packet receive handler.
1194 */
1195
1196 if (po->running) {
1197 /*
1198 * Remove the protocol hook
1199 */
1200 dev_remove_pack(&po->prot_hook);
1201 po->running = 0;
1202 po->num = 0;
1203 __sock_put(sk);
1204 }
1205
1206 packet_flush_mclist(sk);
1207
1208 #ifdef CONFIG_PACKET_MMAP
1209 memset(&req, 0, sizeof(req));
1210
1211 if (po->rx_ring.pg_vec)
1212 packet_set_ring(sk, &req, 1, 0);
1213
1214 if (po->tx_ring.pg_vec)
1215 packet_set_ring(sk, &req, 1, 1);
1216 #endif
1217
1218 /*
1219 * Now the socket is dead. No more input will appear.
1220 */
1221
1222 sock_orphan(sk);
1223 sock->sk = NULL;
1224
1225 /* Purge queues */
1226
1227 skb_queue_purge(&sk->sk_receive_queue);
1228 sk_refcnt_debug_release(sk);
1229
1230 sock_put(sk);
1231 return 0;
1232 }
1233
1234 /*
1235 * Attach a packet hook.
1236 */
1237
1238 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1239 {
1240 struct packet_sock *po = pkt_sk(sk);
1241 /*
1242 * Detach an existing hook if present.
1243 */
1244
1245 lock_sock(sk);
1246
1247 spin_lock(&po->bind_lock);
1248 if (po->running) {
1249 __sock_put(sk);
1250 po->running = 0;
1251 po->num = 0;
1252 spin_unlock(&po->bind_lock);
1253 dev_remove_pack(&po->prot_hook);
1254 spin_lock(&po->bind_lock);
1255 }
1256
1257 po->num = protocol;
1258 po->prot_hook.type = protocol;
1259 po->prot_hook.dev = dev;
1260
1261 po->ifindex = dev ? dev->ifindex : 0;
1262
1263 if (protocol == 0)
1264 goto out_unlock;
1265
1266 if (!dev || (dev->flags & IFF_UP)) {
1267 dev_add_pack(&po->prot_hook);
1268 sock_hold(sk);
1269 po->running = 1;
1270 } else {
1271 sk->sk_err = ENETDOWN;
1272 if (!sock_flag(sk, SOCK_DEAD))
1273 sk->sk_error_report(sk);
1274 }
1275
1276 out_unlock:
1277 spin_unlock(&po->bind_lock);
1278 release_sock(sk);
1279 return 0;
1280 }
1281
1282 /*
1283 * Bind a packet socket to a device
1284 */
1285
1286 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1287 {
1288 struct sock *sk=sock->sk;
1289 char name[15];
1290 struct net_device *dev;
1291 int err = -ENODEV;
1292
1293 /*
1294 * Check legality
1295 */
1296
1297 if (addr_len != sizeof(struct sockaddr))
1298 return -EINVAL;
1299 strlcpy(name,uaddr->sa_data,sizeof(name));
1300
1301 dev = dev_get_by_name(sock_net(sk), name);
1302 if (dev) {
1303 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1304 dev_put(dev);
1305 }
1306 return err;
1307 }
1308
1309 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1310 {
1311 struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
1312 struct sock *sk=sock->sk;
1313 struct net_device *dev = NULL;
1314 int err;
1315
1316
1317 /*
1318 * Check legality
1319 */
1320
1321 if (addr_len < sizeof(struct sockaddr_ll))
1322 return -EINVAL;
1323 if (sll->sll_family != AF_PACKET)
1324 return -EINVAL;
1325
1326 if (sll->sll_ifindex) {
1327 err = -ENODEV;
1328 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1329 if (dev == NULL)
1330 goto out;
1331 }
1332 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1333 if (dev)
1334 dev_put(dev);
1335
1336 out:
1337 return err;
1338 }
1339
1340 static struct proto packet_proto = {
1341 .name = "PACKET",
1342 .owner = THIS_MODULE,
1343 .obj_size = sizeof(struct packet_sock),
1344 };
1345
1346 /*
1347 * Create a packet of type SOCK_PACKET.
1348 */
1349
1350 static int packet_create(struct net *net, struct socket *sock, int protocol)
1351 {
1352 struct sock *sk;
1353 struct packet_sock *po;
1354 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1355 int err;
1356
1357 if (!capable(CAP_NET_RAW))
1358 return -EPERM;
1359 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1360 sock->type != SOCK_PACKET)
1361 return -ESOCKTNOSUPPORT;
1362
1363 sock->state = SS_UNCONNECTED;
1364
1365 err = -ENOBUFS;
1366 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1367 if (sk == NULL)
1368 goto out;
1369
1370 sock->ops = &packet_ops;
1371 if (sock->type == SOCK_PACKET)
1372 sock->ops = &packet_ops_spkt;
1373
1374 sock_init_data(sock, sk);
1375
1376 po = pkt_sk(sk);
1377 sk->sk_family = PF_PACKET;
1378 po->num = proto;
1379
1380 sk->sk_destruct = packet_sock_destruct;
1381 sk_refcnt_debug_inc(sk);
1382
1383 /*
1384 * Attach a protocol block
1385 */
1386
1387 spin_lock_init(&po->bind_lock);
1388 mutex_init(&po->pg_vec_lock);
1389 po->prot_hook.func = packet_rcv;
1390
1391 if (sock->type == SOCK_PACKET)
1392 po->prot_hook.func = packet_rcv_spkt;
1393
1394 po->prot_hook.af_packet_priv = sk;
1395
1396 if (proto) {
1397 po->prot_hook.type = proto;
1398 dev_add_pack(&po->prot_hook);
1399 sock_hold(sk);
1400 po->running = 1;
1401 }
1402
1403 write_lock_bh(&net->packet.sklist_lock);
1404 sk_add_node(sk, &net->packet.sklist);
1405 sock_prot_inuse_add(net, &packet_proto, 1);
1406 write_unlock_bh(&net->packet.sklist_lock);
1407 return(0);
1408 out:
1409 return err;
1410 }
1411
1412 /*
1413 * Pull a packet from our receive queue and hand it to the user.
1414 * If necessary we block.
1415 */
1416
1417 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1418 struct msghdr *msg, size_t len, int flags)
1419 {
1420 struct sock *sk = sock->sk;
1421 struct sk_buff *skb;
1422 int copied, err;
1423 struct sockaddr_ll *sll;
1424
1425 err = -EINVAL;
1426 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
1427 goto out;
1428
1429 #if 0
1430 /* What error should we return now? EUNATTACH? */
1431 if (pkt_sk(sk)->ifindex < 0)
1432 return -ENODEV;
1433 #endif
1434
1435 /*
1436 * Call the generic datagram receiver. This handles all sorts
1437 * of horrible races and re-entrancy so we can forget about it
1438 * in the protocol layers.
1439 *
1440 * Now it will return ENETDOWN, if device have just gone down,
1441 * but then it will block.
1442 */
1443
1444 skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err);
1445
1446 /*
1447 * An error occurred so return it. Because skb_recv_datagram()
1448 * handles the blocking we don't see and worry about blocking
1449 * retries.
1450 */
1451
1452 if (skb == NULL)
1453 goto out;
1454
1455 /*
1456 * If the address length field is there to be filled in, we fill
1457 * it in now.
1458 */
1459
1460 sll = &PACKET_SKB_CB(skb)->sa.ll;
1461 if (sock->type == SOCK_PACKET)
1462 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1463 else
1464 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1465
1466 /*
1467 * You lose any data beyond the buffer you gave. If it worries a
1468 * user program they can ask the device for its MTU anyway.
1469 */
1470
1471 copied = skb->len;
1472 if (copied > len)
1473 {
1474 copied=len;
1475 msg->msg_flags|=MSG_TRUNC;
1476 }
1477
1478 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1479 if (err)
1480 goto out_free;
1481
1482 sock_recv_timestamp(msg, sk, skb);
1483
1484 if (msg->msg_name)
1485 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1486 msg->msg_namelen);
1487
1488 if (pkt_sk(sk)->auxdata) {
1489 struct tpacket_auxdata aux;
1490
1491 aux.tp_status = TP_STATUS_USER;
1492 if (skb->ip_summed == CHECKSUM_PARTIAL)
1493 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1494 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1495 aux.tp_snaplen = skb->len;
1496 aux.tp_mac = 0;
1497 aux.tp_net = skb_network_offset(skb);
1498 aux.tp_vlan_tci = skb->vlan_tci;
1499
1500 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1501 }
1502
1503 /*
1504 * Free or return the buffer as appropriate. Again this
1505 * hides all the races and re-entrancy issues from us.
1506 */
1507 err = (flags&MSG_TRUNC) ? skb->len : copied;
1508
1509 out_free:
1510 skb_free_datagram(sk, skb);
1511 out:
1512 return err;
1513 }
1514
1515 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1516 int *uaddr_len, int peer)
1517 {
1518 struct net_device *dev;
1519 struct sock *sk = sock->sk;
1520
1521 if (peer)
1522 return -EOPNOTSUPP;
1523
1524 uaddr->sa_family = AF_PACKET;
1525 dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex);
1526 if (dev) {
1527 strlcpy(uaddr->sa_data, dev->name, 15);
1528 dev_put(dev);
1529 } else
1530 memset(uaddr->sa_data, 0, 14);
1531 *uaddr_len = sizeof(*uaddr);
1532
1533 return 0;
1534 }
1535
1536 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1537 int *uaddr_len, int peer)
1538 {
1539 struct net_device *dev;
1540 struct sock *sk = sock->sk;
1541 struct packet_sock *po = pkt_sk(sk);
1542 struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
1543
1544 if (peer)
1545 return -EOPNOTSUPP;
1546
1547 sll->sll_family = AF_PACKET;
1548 sll->sll_ifindex = po->ifindex;
1549 sll->sll_protocol = po->num;
1550 dev = dev_get_by_index(sock_net(sk), po->ifindex);
1551 if (dev) {
1552 sll->sll_hatype = dev->type;
1553 sll->sll_halen = dev->addr_len;
1554 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1555 dev_put(dev);
1556 } else {
1557 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1558 sll->sll_halen = 0;
1559 }
1560 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1561
1562 return 0;
1563 }
1564
1565 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1566 int what)
1567 {
1568 switch (i->type) {
1569 case PACKET_MR_MULTICAST:
1570 if (what > 0)
1571 return dev_mc_add(dev, i->addr, i->alen, 0);
1572 else
1573 return dev_mc_delete(dev, i->addr, i->alen, 0);
1574 break;
1575 case PACKET_MR_PROMISC:
1576 return dev_set_promiscuity(dev, what);
1577 break;
1578 case PACKET_MR_ALLMULTI:
1579 return dev_set_allmulti(dev, what);
1580 break;
1581 case PACKET_MR_UNICAST:
1582 if (what > 0)
1583 return dev_unicast_add(dev, i->addr);
1584 else
1585 return dev_unicast_delete(dev, i->addr);
1586 break;
1587 default:;
1588 }
1589 return 0;
1590 }
1591
1592 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1593 {
1594 for ( ; i; i=i->next) {
1595 if (i->ifindex == dev->ifindex)
1596 packet_dev_mc(dev, i, what);
1597 }
1598 }
1599
1600 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1601 {
1602 struct packet_sock *po = pkt_sk(sk);
1603 struct packet_mclist *ml, *i;
1604 struct net_device *dev;
1605 int err;
1606
1607 rtnl_lock();
1608
1609 err = -ENODEV;
1610 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1611 if (!dev)
1612 goto done;
1613
1614 err = -EINVAL;
1615 if (mreq->mr_alen > dev->addr_len)
1616 goto done;
1617
1618 err = -ENOBUFS;
1619 i = kmalloc(sizeof(*i), GFP_KERNEL);
1620 if (i == NULL)
1621 goto done;
1622
1623 err = 0;
1624 for (ml = po->mclist; ml; ml = ml->next) {
1625 if (ml->ifindex == mreq->mr_ifindex &&
1626 ml->type == mreq->mr_type &&
1627 ml->alen == mreq->mr_alen &&
1628 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1629 ml->count++;
1630 /* Free the new element ... */
1631 kfree(i);
1632 goto done;
1633 }
1634 }
1635
1636 i->type = mreq->mr_type;
1637 i->ifindex = mreq->mr_ifindex;
1638 i->alen = mreq->mr_alen;
1639 memcpy(i->addr, mreq->mr_address, i->alen);
1640 i->count = 1;
1641 i->next = po->mclist;
1642 po->mclist = i;
1643 err = packet_dev_mc(dev, i, 1);
1644 if (err) {
1645 po->mclist = i->next;
1646 kfree(i);
1647 }
1648
1649 done:
1650 rtnl_unlock();
1651 return err;
1652 }
1653
1654 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1655 {
1656 struct packet_mclist *ml, **mlp;
1657
1658 rtnl_lock();
1659
1660 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1661 if (ml->ifindex == mreq->mr_ifindex &&
1662 ml->type == mreq->mr_type &&
1663 ml->alen == mreq->mr_alen &&
1664 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1665 if (--ml->count == 0) {
1666 struct net_device *dev;
1667 *mlp = ml->next;
1668 dev = dev_get_by_index(sock_net(sk), ml->ifindex);
1669 if (dev) {
1670 packet_dev_mc(dev, ml, -1);
1671 dev_put(dev);
1672 }
1673 kfree(ml);
1674 }
1675 rtnl_unlock();
1676 return 0;
1677 }
1678 }
1679 rtnl_unlock();
1680 return -EADDRNOTAVAIL;
1681 }
1682
1683 static void packet_flush_mclist(struct sock *sk)
1684 {
1685 struct packet_sock *po = pkt_sk(sk);
1686 struct packet_mclist *ml;
1687
1688 if (!po->mclist)
1689 return;
1690
1691 rtnl_lock();
1692 while ((ml = po->mclist) != NULL) {
1693 struct net_device *dev;
1694
1695 po->mclist = ml->next;
1696 if ((dev = dev_get_by_index(sock_net(sk), ml->ifindex)) != NULL) {
1697 packet_dev_mc(dev, ml, -1);
1698 dev_put(dev);
1699 }
1700 kfree(ml);
1701 }
1702 rtnl_unlock();
1703 }
1704
1705 static int
1706 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1707 {
1708 struct sock *sk = sock->sk;
1709 struct packet_sock *po = pkt_sk(sk);
1710 int ret;
1711
1712 if (level != SOL_PACKET)
1713 return -ENOPROTOOPT;
1714
1715 switch (optname) {
1716 case PACKET_ADD_MEMBERSHIP:
1717 case PACKET_DROP_MEMBERSHIP:
1718 {
1719 struct packet_mreq_max mreq;
1720 int len = optlen;
1721 memset(&mreq, 0, sizeof(mreq));
1722 if (len < sizeof(struct packet_mreq))
1723 return -EINVAL;
1724 if (len > sizeof(mreq))
1725 len = sizeof(mreq);
1726 if (copy_from_user(&mreq,optval,len))
1727 return -EFAULT;
1728 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1729 return -EINVAL;
1730 if (optname == PACKET_ADD_MEMBERSHIP)
1731 ret = packet_mc_add(sk, &mreq);
1732 else
1733 ret = packet_mc_drop(sk, &mreq);
1734 return ret;
1735 }
1736
1737 #ifdef CONFIG_PACKET_MMAP
1738 case PACKET_RX_RING:
1739 case PACKET_TX_RING:
1740 {
1741 struct tpacket_req req;
1742
1743 if (optlen<sizeof(req))
1744 return -EINVAL;
1745 if (copy_from_user(&req,optval,sizeof(req)))
1746 return -EFAULT;
1747 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
1748 }
1749 case PACKET_COPY_THRESH:
1750 {
1751 int val;
1752
1753 if (optlen!=sizeof(val))
1754 return -EINVAL;
1755 if (copy_from_user(&val,optval,sizeof(val)))
1756 return -EFAULT;
1757
1758 pkt_sk(sk)->copy_thresh = val;
1759 return 0;
1760 }
1761 case PACKET_VERSION:
1762 {
1763 int val;
1764
1765 if (optlen != sizeof(val))
1766 return -EINVAL;
1767 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1768 return -EBUSY;
1769 if (copy_from_user(&val, optval, sizeof(val)))
1770 return -EFAULT;
1771 switch (val) {
1772 case TPACKET_V1:
1773 case TPACKET_V2:
1774 po->tp_version = val;
1775 return 0;
1776 default:
1777 return -EINVAL;
1778 }
1779 }
1780 case PACKET_RESERVE:
1781 {
1782 unsigned int val;
1783
1784 if (optlen != sizeof(val))
1785 return -EINVAL;
1786 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1787 return -EBUSY;
1788 if (copy_from_user(&val, optval, sizeof(val)))
1789 return -EFAULT;
1790 po->tp_reserve = val;
1791 return 0;
1792 }
1793 case PACKET_LOSS:
1794 {
1795 unsigned int val;
1796
1797 if (optlen != sizeof(val))
1798 return -EINVAL;
1799 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1800 return -EBUSY;
1801 if (copy_from_user(&val, optval, sizeof(val)))
1802 return -EFAULT;
1803 po->tp_loss = !!val;
1804 return 0;
1805 }
1806 #endif
1807 case PACKET_AUXDATA:
1808 {
1809 int val;
1810
1811 if (optlen < sizeof(val))
1812 return -EINVAL;
1813 if (copy_from_user(&val, optval, sizeof(val)))
1814 return -EFAULT;
1815
1816 po->auxdata = !!val;
1817 return 0;
1818 }
1819 case PACKET_ORIGDEV:
1820 {
1821 int val;
1822
1823 if (optlen < sizeof(val))
1824 return -EINVAL;
1825 if (copy_from_user(&val, optval, sizeof(val)))
1826 return -EFAULT;
1827
1828 po->origdev = !!val;
1829 return 0;
1830 }
1831 default:
1832 return -ENOPROTOOPT;
1833 }
1834 }
1835
1836 static int packet_getsockopt(struct socket *sock, int level, int optname,
1837 char __user *optval, int __user *optlen)
1838 {
1839 int len;
1840 int val;
1841 struct sock *sk = sock->sk;
1842 struct packet_sock *po = pkt_sk(sk);
1843 void *data;
1844 struct tpacket_stats st;
1845
1846 if (level != SOL_PACKET)
1847 return -ENOPROTOOPT;
1848
1849 if (get_user(len, optlen))
1850 return -EFAULT;
1851
1852 if (len < 0)
1853 return -EINVAL;
1854
1855 switch (optname) {
1856 case PACKET_STATISTICS:
1857 if (len > sizeof(struct tpacket_stats))
1858 len = sizeof(struct tpacket_stats);
1859 spin_lock_bh(&sk->sk_receive_queue.lock);
1860 st = po->stats;
1861 memset(&po->stats, 0, sizeof(st));
1862 spin_unlock_bh(&sk->sk_receive_queue.lock);
1863 st.tp_packets += st.tp_drops;
1864
1865 data = &st;
1866 break;
1867 case PACKET_AUXDATA:
1868 if (len > sizeof(int))
1869 len = sizeof(int);
1870 val = po->auxdata;
1871
1872 data = &val;
1873 break;
1874 case PACKET_ORIGDEV:
1875 if (len > sizeof(int))
1876 len = sizeof(int);
1877 val = po->origdev;
1878
1879 data = &val;
1880 break;
1881 #ifdef CONFIG_PACKET_MMAP
1882 case PACKET_VERSION:
1883 if (len > sizeof(int))
1884 len = sizeof(int);
1885 val = po->tp_version;
1886 data = &val;
1887 break;
1888 case PACKET_HDRLEN:
1889 if (len > sizeof(int))
1890 len = sizeof(int);
1891 if (copy_from_user(&val, optval, len))
1892 return -EFAULT;
1893 switch (val) {
1894 case TPACKET_V1:
1895 val = sizeof(struct tpacket_hdr);
1896 break;
1897 case TPACKET_V2:
1898 val = sizeof(struct tpacket2_hdr);
1899 break;
1900 default:
1901 return -EINVAL;
1902 }
1903 data = &val;
1904 break;
1905 case PACKET_RESERVE:
1906 if (len > sizeof(unsigned int))
1907 len = sizeof(unsigned int);
1908 val = po->tp_reserve;
1909 data = &val;
1910 break;
1911 case PACKET_LOSS:
1912 if (len > sizeof(unsigned int))
1913 len = sizeof(unsigned int);
1914 val = po->tp_loss;
1915 data = &val;
1916 break;
1917 #endif
1918 default:
1919 return -ENOPROTOOPT;
1920 }
1921
1922 if (put_user(len, optlen))
1923 return -EFAULT;
1924 if (copy_to_user(optval, data, len))
1925 return -EFAULT;
1926 return 0;
1927 }
1928
1929
1930 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
1931 {
1932 struct sock *sk;
1933 struct hlist_node *node;
1934 struct net_device *dev = data;
1935 struct net *net = dev_net(dev);
1936
1937 read_lock(&net->packet.sklist_lock);
1938 sk_for_each(sk, node, &net->packet.sklist) {
1939 struct packet_sock *po = pkt_sk(sk);
1940
1941 switch (msg) {
1942 case NETDEV_UNREGISTER:
1943 if (po->mclist)
1944 packet_dev_mclist(dev, po->mclist, -1);
1945 /* fallthrough */
1946
1947 case NETDEV_DOWN:
1948 if (dev->ifindex == po->ifindex) {
1949 spin_lock(&po->bind_lock);
1950 if (po->running) {
1951 __dev_remove_pack(&po->prot_hook);
1952 __sock_put(sk);
1953 po->running = 0;
1954 sk->sk_err = ENETDOWN;
1955 if (!sock_flag(sk, SOCK_DEAD))
1956 sk->sk_error_report(sk);
1957 }
1958 if (msg == NETDEV_UNREGISTER) {
1959 po->ifindex = -1;
1960 po->prot_hook.dev = NULL;
1961 }
1962 spin_unlock(&po->bind_lock);
1963 }
1964 break;
1965 case NETDEV_UP:
1966 spin_lock(&po->bind_lock);
1967 if (dev->ifindex == po->ifindex && po->num &&
1968 !po->running) {
1969 dev_add_pack(&po->prot_hook);
1970 sock_hold(sk);
1971 po->running = 1;
1972 }
1973 spin_unlock(&po->bind_lock);
1974 break;
1975 }
1976 }
1977 read_unlock(&net->packet.sklist_lock);
1978 return NOTIFY_DONE;
1979 }
1980
1981
1982 static int packet_ioctl(struct socket *sock, unsigned int cmd,
1983 unsigned long arg)
1984 {
1985 struct sock *sk = sock->sk;
1986
1987 switch (cmd) {
1988 case SIOCOUTQ:
1989 {
1990 int amount = sk_wmem_alloc_get(sk);
1991
1992 return put_user(amount, (int __user *)arg);
1993 }
1994 case SIOCINQ:
1995 {
1996 struct sk_buff *skb;
1997 int amount = 0;
1998
1999 spin_lock_bh(&sk->sk_receive_queue.lock);
2000 skb = skb_peek(&sk->sk_receive_queue);
2001 if (skb)
2002 amount = skb->len;
2003 spin_unlock_bh(&sk->sk_receive_queue.lock);
2004 return put_user(amount, (int __user *)arg);
2005 }
2006 case SIOCGSTAMP:
2007 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2008 case SIOCGSTAMPNS:
2009 return sock_get_timestampns(sk, (struct timespec __user *)arg);
2010
2011 #ifdef CONFIG_INET
2012 case SIOCADDRT:
2013 case SIOCDELRT:
2014 case SIOCDARP:
2015 case SIOCGARP:
2016 case SIOCSARP:
2017 case SIOCGIFADDR:
2018 case SIOCSIFADDR:
2019 case SIOCGIFBRDADDR:
2020 case SIOCSIFBRDADDR:
2021 case SIOCGIFNETMASK:
2022 case SIOCSIFNETMASK:
2023 case SIOCGIFDSTADDR:
2024 case SIOCSIFDSTADDR:
2025 case SIOCSIFFLAGS:
2026 if (!net_eq(sock_net(sk), &init_net))
2027 return -ENOIOCTLCMD;
2028 return inet_dgram_ops.ioctl(sock, cmd, arg);
2029 #endif
2030
2031 default:
2032 return -ENOIOCTLCMD;
2033 }
2034 return 0;
2035 }
2036
2037 #ifndef CONFIG_PACKET_MMAP
2038 #define packet_mmap sock_no_mmap
2039 #define packet_poll datagram_poll
2040 #else
2041
2042 static unsigned int packet_poll(struct file * file, struct socket *sock,
2043 poll_table *wait)
2044 {
2045 struct sock *sk = sock->sk;
2046 struct packet_sock *po = pkt_sk(sk);
2047 unsigned int mask = datagram_poll(file, sock, wait);
2048
2049 spin_lock_bh(&sk->sk_receive_queue.lock);
2050 if (po->rx_ring.pg_vec) {
2051 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
2052 mask |= POLLIN | POLLRDNORM;
2053 }
2054 spin_unlock_bh(&sk->sk_receive_queue.lock);
2055 spin_lock_bh(&sk->sk_write_queue.lock);
2056 if (po->tx_ring.pg_vec) {
2057 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2058 mask |= POLLOUT | POLLWRNORM;
2059 }
2060 spin_unlock_bh(&sk->sk_write_queue.lock);
2061 return mask;
2062 }
2063
2064
2065 /* Dirty? Well, I still did not learn better way to account
2066 * for user mmaps.
2067 */
2068
2069 static void packet_mm_open(struct vm_area_struct *vma)
2070 {
2071 struct file *file = vma->vm_file;
2072 struct socket * sock = file->private_data;
2073 struct sock *sk = sock->sk;
2074
2075 if (sk)
2076 atomic_inc(&pkt_sk(sk)->mapped);
2077 }
2078
2079 static void packet_mm_close(struct vm_area_struct *vma)
2080 {
2081 struct file *file = vma->vm_file;
2082 struct socket * sock = file->private_data;
2083 struct sock *sk = sock->sk;
2084
2085 if (sk)
2086 atomic_dec(&pkt_sk(sk)->mapped);
2087 }
2088
2089 static struct vm_operations_struct packet_mmap_ops = {
2090 .open = packet_mm_open,
2091 .close =packet_mm_close,
2092 };
2093
2094 static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
2095 {
2096 int i;
2097
2098 for (i = 0; i < len; i++) {
2099 if (likely(pg_vec[i]))
2100 free_pages((unsigned long) pg_vec[i], order);
2101 }
2102 kfree(pg_vec);
2103 }
2104
2105 static inline char *alloc_one_pg_vec_page(unsigned long order)
2106 {
2107 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;
2108
2109 return (char *) __get_free_pages(gfp_flags, order);
2110 }
2111
2112 static char **alloc_pg_vec(struct tpacket_req *req, int order)
2113 {
2114 unsigned int block_nr = req->tp_block_nr;
2115 char **pg_vec;
2116 int i;
2117
2118 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
2119 if (unlikely(!pg_vec))
2120 goto out;
2121
2122 for (i = 0; i < block_nr; i++) {
2123 pg_vec[i] = alloc_one_pg_vec_page(order);
2124 if (unlikely(!pg_vec[i]))
2125 goto out_free_pgvec;
2126 }
2127
2128 out:
2129 return pg_vec;
2130
2131 out_free_pgvec:
2132 free_pg_vec(pg_vec, order, block_nr);
2133 pg_vec = NULL;
2134 goto out;
2135 }
2136
2137 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2138 int closing, int tx_ring)
2139 {
2140 char **pg_vec = NULL;
2141 struct packet_sock *po = pkt_sk(sk);
2142 int was_running, order = 0;
2143 struct packet_ring_buffer *rb;
2144 struct sk_buff_head *rb_queue;
2145 __be16 num;
2146 int err;
2147
2148 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2149 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2150
2151 err = -EBUSY;
2152 if (!closing) {
2153 if (atomic_read(&po->mapped))
2154 goto out;
2155 if (atomic_read(&rb->pending))
2156 goto out;
2157 }
2158
2159 if (req->tp_block_nr) {
2160 /* Sanity tests and some calculations */
2161 err = -EBUSY;
2162 if (unlikely(rb->pg_vec))
2163 goto out;
2164
2165 switch (po->tp_version) {
2166 case TPACKET_V1:
2167 po->tp_hdrlen = TPACKET_HDRLEN;
2168 break;
2169 case TPACKET_V2:
2170 po->tp_hdrlen = TPACKET2_HDRLEN;
2171 break;
2172 }
2173
2174 err = -EINVAL;
2175 if (unlikely((int)req->tp_block_size <= 0))
2176 goto out;
2177 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
2178 goto out;
2179 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
2180 po->tp_reserve))
2181 goto out;
2182 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
2183 goto out;
2184
2185 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2186 if (unlikely(rb->frames_per_block <= 0))
2187 goto out;
2188 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2189 req->tp_frame_nr))
2190 goto out;
2191
2192 err = -ENOMEM;
2193 order = get_order(req->tp_block_size);
2194 pg_vec = alloc_pg_vec(req, order);
2195 if (unlikely(!pg_vec))
2196 goto out;
2197 }
2198 /* Done */
2199 else {
2200 err = -EINVAL;
2201 if (unlikely(req->tp_frame_nr))
2202 goto out;
2203 }
2204
2205 lock_sock(sk);
2206
2207 /* Detach socket from network */
2208 spin_lock(&po->bind_lock);
2209 was_running = po->running;
2210 num = po->num;
2211 if (was_running) {
2212 __dev_remove_pack(&po->prot_hook);
2213 po->num = 0;
2214 po->running = 0;
2215 __sock_put(sk);
2216 }
2217 spin_unlock(&po->bind_lock);
2218
2219 synchronize_net();
2220
2221 err = -EBUSY;
2222 mutex_lock(&po->pg_vec_lock);
2223 if (closing || atomic_read(&po->mapped) == 0) {
2224 err = 0;
2225 #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
2226 spin_lock_bh(&rb_queue->lock);
2227 pg_vec = XC(rb->pg_vec, pg_vec);
2228 rb->frame_max = (req->tp_frame_nr - 1);
2229 rb->head = 0;
2230 rb->frame_size = req->tp_frame_size;
2231 spin_unlock_bh(&rb_queue->lock);
2232
2233 order = XC(rb->pg_vec_order, order);
2234 req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr);
2235
2236 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2237 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2238 tpacket_rcv : packet_rcv;
2239 skb_queue_purge(rb_queue);
2240 #undef XC
2241 if (atomic_read(&po->mapped))
2242 printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n",
2243 atomic_read(&po->mapped));
2244 }
2245 mutex_unlock(&po->pg_vec_lock);
2246
2247 spin_lock(&po->bind_lock);
2248 if (was_running && !po->running) {
2249 sock_hold(sk);
2250 po->running = 1;
2251 po->num = num;
2252 dev_add_pack(&po->prot_hook);
2253 }
2254 spin_unlock(&po->bind_lock);
2255
2256 release_sock(sk);
2257
2258 if (pg_vec)
2259 free_pg_vec(pg_vec, order, req->tp_block_nr);
2260 out:
2261 return err;
2262 }
2263
2264 static int packet_mmap(struct file *file, struct socket *sock,
2265 struct vm_area_struct *vma)
2266 {
2267 struct sock *sk = sock->sk;
2268 struct packet_sock *po = pkt_sk(sk);
2269 unsigned long size, expected_size;
2270 struct packet_ring_buffer *rb;
2271 unsigned long start;
2272 int err = -EINVAL;
2273 int i;
2274
2275 if (vma->vm_pgoff)
2276 return -EINVAL;
2277
2278 mutex_lock(&po->pg_vec_lock);
2279
2280 expected_size = 0;
2281 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2282 if (rb->pg_vec) {
2283 expected_size += rb->pg_vec_len
2284 * rb->pg_vec_pages
2285 * PAGE_SIZE;
2286 }
2287 }
2288
2289 if (expected_size == 0)
2290 goto out;
2291
2292 size = vma->vm_end - vma->vm_start;
2293 if (size != expected_size)
2294 goto out;
2295
2296 start = vma->vm_start;
2297 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2298 if (rb->pg_vec == NULL)
2299 continue;
2300
2301 for (i = 0; i < rb->pg_vec_len; i++) {
2302 struct page *page = virt_to_page(rb->pg_vec[i]);
2303 int pg_num;
2304
2305 for (pg_num = 0; pg_num < rb->pg_vec_pages;
2306 pg_num++,page++) {
2307 err = vm_insert_page(vma, start, page);
2308 if (unlikely(err))
2309 goto out;
2310 start += PAGE_SIZE;
2311 }
2312 }
2313 }
2314
2315 atomic_inc(&po->mapped);
2316 vma->vm_ops = &packet_mmap_ops;
2317 err = 0;
2318
2319 out:
2320 mutex_unlock(&po->pg_vec_lock);
2321 return err;
2322 }
2323 #endif
2324
2325
2326 static const struct proto_ops packet_ops_spkt = {
2327 .family = PF_PACKET,
2328 .owner = THIS_MODULE,
2329 .release = packet_release,
2330 .bind = packet_bind_spkt,
2331 .connect = sock_no_connect,
2332 .socketpair = sock_no_socketpair,
2333 .accept = sock_no_accept,
2334 .getname = packet_getname_spkt,
2335 .poll = datagram_poll,
2336 .ioctl = packet_ioctl,
2337 .listen = sock_no_listen,
2338 .shutdown = sock_no_shutdown,
2339 .setsockopt = sock_no_setsockopt,
2340 .getsockopt = sock_no_getsockopt,
2341 .sendmsg = packet_sendmsg_spkt,
2342 .recvmsg = packet_recvmsg,
2343 .mmap = sock_no_mmap,
2344 .sendpage = sock_no_sendpage,
2345 };
2346
2347 static const struct proto_ops packet_ops = {
2348 .family = PF_PACKET,
2349 .owner = THIS_MODULE,
2350 .release = packet_release,
2351 .bind = packet_bind,
2352 .connect = sock_no_connect,
2353 .socketpair = sock_no_socketpair,
2354 .accept = sock_no_accept,
2355 .getname = packet_getname,
2356 .poll = packet_poll,
2357 .ioctl = packet_ioctl,
2358 .listen = sock_no_listen,
2359 .shutdown = sock_no_shutdown,
2360 .setsockopt = packet_setsockopt,
2361 .getsockopt = packet_getsockopt,
2362 .sendmsg = packet_sendmsg,
2363 .recvmsg = packet_recvmsg,
2364 .mmap = packet_mmap,
2365 .sendpage = sock_no_sendpage,
2366 };
2367
2368 static struct net_proto_family packet_family_ops = {
2369 .family = PF_PACKET,
2370 .create = packet_create,
2371 .owner = THIS_MODULE,
2372 };
2373
2374 static struct notifier_block packet_netdev_notifier = {
2375 .notifier_call =packet_notifier,
2376 };
2377
2378 #ifdef CONFIG_PROC_FS
2379 static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
2380 {
2381 struct sock *s;
2382 struct hlist_node *node;
2383
2384 sk_for_each(s, node, &net->packet.sklist) {
2385 if (!off--)
2386 return s;
2387 }
2388 return NULL;
2389 }
2390
2391 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2392 __acquires(seq_file_net(seq)->packet.sklist_lock)
2393 {
2394 struct net *net = seq_file_net(seq);
2395 read_lock(&net->packet.sklist_lock);
2396 return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
2397 }
2398
2399 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2400 {
2401 struct net *net = seq_file_net(seq);
2402 ++*pos;
2403 return (v == SEQ_START_TOKEN)
2404 ? sk_head(&net->packet.sklist)
2405 : sk_next((struct sock*)v) ;
2406 }
2407
2408 static void packet_seq_stop(struct seq_file *seq, void *v)
2409 __releases(seq_file_net(seq)->packet.sklist_lock)
2410 {
2411 struct net *net = seq_file_net(seq);
2412 read_unlock(&net->packet.sklist_lock);
2413 }
2414
2415 static int packet_seq_show(struct seq_file *seq, void *v)
2416 {
2417 if (v == SEQ_START_TOKEN)
2418 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2419 else {
2420 struct sock *s = v;
2421 const struct packet_sock *po = pkt_sk(s);
2422
2423 seq_printf(seq,
2424 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2425 s,
2426 atomic_read(&s->sk_refcnt),
2427 s->sk_type,
2428 ntohs(po->num),
2429 po->ifindex,
2430 po->running,
2431 atomic_read(&s->sk_rmem_alloc),
2432 sock_i_uid(s),
2433 sock_i_ino(s) );
2434 }
2435
2436 return 0;
2437 }
2438
2439 static const struct seq_operations packet_seq_ops = {
2440 .start = packet_seq_start,
2441 .next = packet_seq_next,
2442 .stop = packet_seq_stop,
2443 .show = packet_seq_show,
2444 };
2445
2446 static int packet_seq_open(struct inode *inode, struct file *file)
2447 {
2448 return seq_open_net(inode, file, &packet_seq_ops,
2449 sizeof(struct seq_net_private));
2450 }
2451
2452 static const struct file_operations packet_seq_fops = {
2453 .owner = THIS_MODULE,
2454 .open = packet_seq_open,
2455 .read = seq_read,
2456 .llseek = seq_lseek,
2457 .release = seq_release_net,
2458 };
2459
2460 #endif
2461
2462 static int packet_net_init(struct net *net)
2463 {
2464 rwlock_init(&net->packet.sklist_lock);
2465 INIT_HLIST_HEAD(&net->packet.sklist);
2466
2467 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2468 return -ENOMEM;
2469
2470 return 0;
2471 }
2472
2473 static void packet_net_exit(struct net *net)
2474 {
2475 proc_net_remove(net, "packet");
2476 }
2477
2478 static struct pernet_operations packet_net_ops = {
2479 .init = packet_net_init,
2480 .exit = packet_net_exit,
2481 };
2482
2483
2484 static void __exit packet_exit(void)
2485 {
2486 unregister_netdevice_notifier(&packet_netdev_notifier);
2487 unregister_pernet_subsys(&packet_net_ops);
2488 sock_unregister(PF_PACKET);
2489 proto_unregister(&packet_proto);
2490 }
2491
2492 static int __init packet_init(void)
2493 {
2494 int rc = proto_register(&packet_proto, 0);
2495
2496 if (rc != 0)
2497 goto out;
2498
2499 sock_register(&packet_family_ops);
2500 register_pernet_subsys(&packet_net_ops);
2501 register_netdevice_notifier(&packet_netdev_notifier);
2502 out:
2503 return rc;
2504 }
2505
2506 module_init(packet_init);
2507 module_exit(packet_exit);
2508 MODULE_LICENSE("GPL");
2509 MODULE_ALIAS_NETPROTO(PF_PACKET);
Linux kernel - Deliverables
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