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mac80211: split hardware scan by band
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / packet / af_packet.c
blob95ef64e4189af1e388c9bcb02599d7ff2179773e
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 #include <linux/if_vlan.h>
83
84 #ifdef CONFIG_INET
85 #include <net/inet_common.h>
86 #endif
87
88 /*
89 Assumptions:
90 - if device has no dev->hard_header routine, it adds and removes ll header
91 inside itself. In this case ll header is invisible outside of device,
92 but higher levels still should reserve dev->hard_header_len.
93 Some devices are enough clever to reallocate skb, when header
94 will not fit to reserved space (tunnel), another ones are silly
95 (PPP).
96 - packet socket receives packets with pulled ll header,
97 so that SOCK_RAW should push it back.
98
99 On receive:
100 -----------
101
102 Incoming, dev->hard_header!=NULL
103 mac_header -> ll header
104 data -> data
105
106 Outgoing, dev->hard_header!=NULL
107 mac_header -> ll header
108 data -> ll header
109
110 Incoming, dev->hard_header==NULL
111 mac_header -> UNKNOWN position. It is very likely, that it points to ll
112 header. PPP makes it, that is wrong, because introduce
113 assymetry between rx and tx paths.
114 data -> data
115
116 Outgoing, dev->hard_header==NULL
117 mac_header -> data. ll header is still not built!
118 data -> data
119
120 Resume
121 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
122
123
124 On transmit:
125 ------------
126
127 dev->hard_header != NULL
128 mac_header -> ll header
129 data -> ll header
130
131 dev->hard_header == NULL (ll header is added by device, we cannot control it)
132 mac_header -> data
133 data -> data
134
135 We should set nh.raw on output to correct posistion,
136 packet classifier depends on it.
137 */
138
139 /* Private packet socket structures. */
140
141 struct packet_mclist {
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 int mr_ifindex;
154 unsigned short mr_type;
155 unsigned short mr_alen;
156 unsigned char mr_address[MAX_ADDR_LEN];
157 };
158
159 #ifdef CONFIG_PACKET_MMAP
160 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
161 int closing, int tx_ring);
162
163 struct packet_ring_buffer {
164 char **pg_vec;
165 unsigned int head;
166 unsigned int frames_per_block;
167 unsigned int frame_size;
168 unsigned int frame_max;
169
170 unsigned int pg_vec_order;
171 unsigned int pg_vec_pages;
172 unsigned int pg_vec_len;
173
174 atomic_t pending;
175 };
176
177 struct packet_sock;
178 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
179 #endif
180
181 static void packet_flush_mclist(struct sock *sk);
182
183 struct packet_sock {
184 /* struct sock has to be the first member of packet_sock */
185 struct sock sk;
186 struct tpacket_stats stats;
187 #ifdef CONFIG_PACKET_MMAP
188 struct packet_ring_buffer rx_ring;
189 struct packet_ring_buffer tx_ring;
190 int copy_thresh;
191 #endif
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 struct packet_type prot_hook ____cacheline_aligned_in_smp;
208 };
209
210 struct packet_skb_cb {
211 unsigned int origlen;
212 union {
213 struct sockaddr_pkt pkt;
214 struct sockaddr_ll ll;
215 } sa;
216 };
217
218 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
219
220 #ifdef CONFIG_PACKET_MMAP
221
222 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
223 {
224 union {
225 struct tpacket_hdr *h1;
226 struct tpacket2_hdr *h2;
227 void *raw;
228 } h;
229
230 h.raw = frame;
231 switch (po->tp_version) {
232 case TPACKET_V1:
233 h.h1->tp_status = status;
234 flush_dcache_page(virt_to_page(&h.h1->tp_status));
235 break;
236 case TPACKET_V2:
237 h.h2->tp_status = status;
238 flush_dcache_page(virt_to_page(&h.h2->tp_status));
239 break;
240 default:
241 pr_err("TPACKET version not supported\n");
242 BUG();
243 }
244
245 smp_wmb();
246 }
247
248 static int __packet_get_status(struct packet_sock *po, void *frame)
249 {
250 union {
251 struct tpacket_hdr *h1;
252 struct tpacket2_hdr *h2;
253 void *raw;
254 } h;
255
256 smp_rmb();
257
258 h.raw = frame;
259 switch (po->tp_version) {
260 case TPACKET_V1:
261 flush_dcache_page(virt_to_page(&h.h1->tp_status));
262 return h.h1->tp_status;
263 case TPACKET_V2:
264 flush_dcache_page(virt_to_page(&h.h2->tp_status));
265 return h.h2->tp_status;
266 default:
267 pr_err("TPACKET version not supported\n");
268 BUG();
269 return 0;
270 }
271 }
272
273 static void *packet_lookup_frame(struct packet_sock *po,
274 struct packet_ring_buffer *rb,
275 unsigned int position,
276 int status)
277 {
278 unsigned int pg_vec_pos, frame_offset;
279 union {
280 struct tpacket_hdr *h1;
281 struct tpacket2_hdr *h2;
282 void *raw;
283 } h;
284
285 pg_vec_pos = position / rb->frames_per_block;
286 frame_offset = position % rb->frames_per_block;
287
288 h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size);
289
290 if (status != __packet_get_status(po, h.raw))
291 return NULL;
292
293 return h.raw;
294 }
295
296 static inline void *packet_current_frame(struct packet_sock *po,
297 struct packet_ring_buffer *rb,
298 int status)
299 {
300 return packet_lookup_frame(po, rb, rb->head, status);
301 }
302
303 static inline void *packet_previous_frame(struct packet_sock *po,
304 struct packet_ring_buffer *rb,
305 int status)
306 {
307 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
308 return packet_lookup_frame(po, rb, previous, status);
309 }
310
311 static inline void packet_increment_head(struct packet_ring_buffer *buff)
312 {
313 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
314 }
315
316 #endif
317
318 static inline struct packet_sock *pkt_sk(struct sock *sk)
319 {
320 return (struct packet_sock *)sk;
321 }
322
323 static void packet_sock_destruct(struct sock *sk)
324 {
325 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
326 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
327
328 if (!sock_flag(sk, SOCK_DEAD)) {
329 pr_err("Attempt to release alive packet socket: %p\n", sk);
330 return;
331 }
332
333 sk_refcnt_debug_dec(sk);
334 }
335
336
337 static const struct proto_ops packet_ops;
338
339 static const struct proto_ops packet_ops_spkt;
340
341 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
342 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 skb = skb_share_check(skb, GFP_ATOMIC);
372 if (skb == NULL)
373 goto oom;
374
375 /* drop any routing info */
376 skb_dst_drop(skb);
377
378 /* drop conntrack reference */
379 nf_reset(skb);
380
381 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
382
383 skb_push(skb, skb->data - skb_mac_header(skb));
384
385 /*
386 * The SOCK_PACKET socket receives _all_ frames.
387 */
388
389 spkt->spkt_family = dev->type;
390 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
391 spkt->spkt_protocol = skb->protocol;
392
393 /*
394 * Charge the memory to the socket. This is done specifically
395 * to prevent sockets using all the memory up.
396 */
397
398 if (sock_queue_rcv_skb(sk, skb) == 0)
399 return 0;
400
401 out:
402 kfree_skb(skb);
403 oom:
404 return 0;
405 }
406
407
408 /*
409 * Output a raw packet to a device layer. This bypasses all the other
410 * protocol layers and you must therefore supply it with a complete frame
411 */
412
413 static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
414 struct msghdr *msg, size_t len)
415 {
416 struct sock *sk = sock->sk;
417 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
418 struct sk_buff *skb;
419 struct net_device *dev;
420 __be16 proto = 0;
421 int err;
422
423 /*
424 * Get and verify the address.
425 */
426
427 if (saddr) {
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 } else
433 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
434
435 /*
436 * Find the device first to size check it
437 */
438
439 saddr->spkt_device[13] = 0;
440 dev = dev_get_by_name(sock_net(sk), saddr->spkt_device);
441 err = -ENODEV;
442 if (dev == NULL)
443 goto out_unlock;
444
445 err = -ENETDOWN;
446 if (!(dev->flags & IFF_UP))
447 goto out_unlock;
448
449 /*
450 * You may not queue a frame bigger than the mtu. This is the lowest level
451 * raw protocol and you must do your own fragmentation at this level.
452 */
453
454 err = -EMSGSIZE;
455 if (len > dev->mtu + dev->hard_header_len)
456 goto out_unlock;
457
458 err = -ENOBUFS;
459 skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);
460
461 /*
462 * If the write buffer is full, then tough. At this level the user
463 * gets to deal with the problem - do your own algorithmic backoffs.
464 * That's far more flexible.
465 */
466
467 if (skb == NULL)
468 goto out_unlock;
469
470 /*
471 * Fill it in
472 */
473
474 /* FIXME: Save some space for broken drivers that write a
475 * hard header at transmission time by themselves. PPP is the
476 * notable one here. This should really be fixed at the driver level.
477 */
478 skb_reserve(skb, LL_RESERVED_SPACE(dev));
479 skb_reset_network_header(skb);
480
481 /* Try to align data part correctly */
482 if (dev->header_ops) {
483 skb->data -= dev->hard_header_len;
484 skb->tail -= dev->hard_header_len;
485 if (len < dev->hard_header_len)
486 skb_reset_network_header(skb);
487 }
488
489 /* Returns -EFAULT on error */
490 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
491 skb->protocol = proto;
492 skb->dev = dev;
493 skb->priority = sk->sk_priority;
494 skb->mark = sk->sk_mark;
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,
541 struct packet_type *pt, struct net_device *orig_dev)
542 {
543 struct sock *sk;
544 struct sockaddr_ll *sll;
545 struct packet_sock *po;
546 u8 *skb_head = skb->data;
547 int skb_len = skb->len;
548 unsigned int snaplen, res;
549
550 if (skb->pkt_type == PACKET_LOOPBACK)
551 goto drop;
552
553 sk = pt->af_packet_priv;
554 po = pkt_sk(sk);
555
556 if (dev_net(dev) != sock_net(sk))
557 goto drop;
558
559 skb->dev = dev;
560
561 if (dev->header_ops) {
562 /* The device has an explicit notion of ll header,
563 exported to higher levels.
564
565 Otherwise, the device hides datails of it frame
566 structure, so that corresponding packet head
567 never delivered to user.
568 */
569 if (sk->sk_type != SOCK_DGRAM)
570 skb_push(skb, skb->data - skb_mac_header(skb));
571 else if (skb->pkt_type == PACKET_OUTGOING) {
572 /* Special case: outgoing packets have ll header at head */
573 skb_pull(skb, skb_network_offset(skb));
574 }
575 }
576
577 snaplen = skb->len;
578
579 res = run_filter(skb, sk, snaplen);
580 if (!res)
581 goto drop_n_restore;
582 if (snaplen > res)
583 snaplen = res;
584
585 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
586 (unsigned)sk->sk_rcvbuf)
587 goto drop_n_acct;
588
589 if (skb_shared(skb)) {
590 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
591 if (nskb == NULL)
592 goto drop_n_acct;
593
594 if (skb_head != skb->data) {
595 skb->data = skb_head;
596 skb->len = skb_len;
597 }
598 kfree_skb(skb);
599 skb = nskb;
600 }
601
602 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
603 sizeof(skb->cb));
604
605 sll = &PACKET_SKB_CB(skb)->sa.ll;
606 sll->sll_family = AF_PACKET;
607 sll->sll_hatype = dev->type;
608 sll->sll_protocol = skb->protocol;
609 sll->sll_pkttype = skb->pkt_type;
610 if (unlikely(po->origdev))
611 sll->sll_ifindex = orig_dev->ifindex;
612 else
613 sll->sll_ifindex = dev->ifindex;
614
615 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
616
617 PACKET_SKB_CB(skb)->origlen = skb->len;
618
619 if (pskb_trim(skb, snaplen))
620 goto drop_n_acct;
621
622 skb_set_owner_r(skb, sk);
623 skb->dev = NULL;
624 skb_dst_drop(skb);
625
626 /* drop conntrack reference */
627 nf_reset(skb);
628
629 spin_lock(&sk->sk_receive_queue.lock);
630 po->stats.tp_packets++;
631 skb->dropcount = atomic_read(&sk->sk_drops);
632 __skb_queue_tail(&sk->sk_receive_queue, skb);
633 spin_unlock(&sk->sk_receive_queue.lock);
634 sk->sk_data_ready(sk, skb->len);
635 return 0;
636
637 drop_n_acct:
638 po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
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,
652 struct packet_type *pt, struct net_device *orig_dev)
653 {
654 struct sock *sk;
655 struct packet_sock *po;
656 struct sockaddr_ll *sll;
657 union {
658 struct tpacket_hdr *h1;
659 struct tpacket2_hdr *h2;
660 void *raw;
661 } h;
662 u8 *skb_head = skb->data;
663 int skb_len = skb->len;
664 unsigned int snaplen, res;
665 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
666 unsigned short macoff, netoff, hdrlen;
667 struct sk_buff *copy_skb = NULL;
668 struct timeval tv;
669 struct timespec ts;
670
671 if (skb->pkt_type == PACKET_LOOPBACK)
672 goto drop;
673
674 sk = pt->af_packet_priv;
675 po = pkt_sk(sk);
676
677 if (dev_net(dev) != sock_net(sk))
678 goto drop;
679
680 if (dev->header_ops) {
681 if (sk->sk_type != SOCK_DGRAM)
682 skb_push(skb, skb->data - skb_mac_header(skb));
683 else if (skb->pkt_type == PACKET_OUTGOING) {
684 /* Special case: outgoing packets have ll header at head */
685 skb_pull(skb, skb_network_offset(skb));
686 }
687 }
688
689 if (skb->ip_summed == CHECKSUM_PARTIAL)
690 status |= TP_STATUS_CSUMNOTREADY;
691
692 snaplen = skb->len;
693
694 res = run_filter(skb, sk, snaplen);
695 if (!res)
696 goto drop_n_restore;
697 if (snaplen > res)
698 snaplen = res;
699
700 if (sk->sk_type == SOCK_DGRAM) {
701 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
702 po->tp_reserve;
703 } else {
704 unsigned maclen = skb_network_offset(skb);
705 netoff = TPACKET_ALIGN(po->tp_hdrlen +
706 (maclen < 16 ? 16 : maclen)) +
707 po->tp_reserve;
708 macoff = netoff - maclen;
709 }
710
711 if (macoff + snaplen > po->rx_ring.frame_size) {
712 if (po->copy_thresh &&
713 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
714 (unsigned)sk->sk_rcvbuf) {
715 if (skb_shared(skb)) {
716 copy_skb = skb_clone(skb, GFP_ATOMIC);
717 } else {
718 copy_skb = skb_get(skb);
719 skb_head = skb->data;
720 }
721 if (copy_skb)
722 skb_set_owner_r(copy_skb, sk);
723 }
724 snaplen = po->rx_ring.frame_size - macoff;
725 if ((int)snaplen < 0)
726 snaplen = 0;
727 }
728
729 spin_lock(&sk->sk_receive_queue.lock);
730 h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
731 if (!h.raw)
732 goto ring_is_full;
733 packet_increment_head(&po->rx_ring);
734 po->stats.tp_packets++;
735 if (copy_skb) {
736 status |= TP_STATUS_COPY;
737 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
738 }
739 if (!po->stats.tp_drops)
740 status &= ~TP_STATUS_LOSING;
741 spin_unlock(&sk->sk_receive_queue.lock);
742
743 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
744
745 switch (po->tp_version) {
746 case TPACKET_V1:
747 h.h1->tp_len = skb->len;
748 h.h1->tp_snaplen = snaplen;
749 h.h1->tp_mac = macoff;
750 h.h1->tp_net = netoff;
751 if (skb->tstamp.tv64)
752 tv = ktime_to_timeval(skb->tstamp);
753 else
754 do_gettimeofday(&tv);
755 h.h1->tp_sec = tv.tv_sec;
756 h.h1->tp_usec = tv.tv_usec;
757 hdrlen = sizeof(*h.h1);
758 break;
759 case TPACKET_V2:
760 h.h2->tp_len = skb->len;
761 h.h2->tp_snaplen = snaplen;
762 h.h2->tp_mac = macoff;
763 h.h2->tp_net = netoff;
764 if (skb->tstamp.tv64)
765 ts = ktime_to_timespec(skb->tstamp);
766 else
767 getnstimeofday(&ts);
768 h.h2->tp_sec = ts.tv_sec;
769 h.h2->tp_nsec = ts.tv_nsec;
770 h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
771 hdrlen = sizeof(*h.h2);
772 break;
773 default:
774 BUG();
775 }
776
777 sll = h.raw + TPACKET_ALIGN(hdrlen);
778 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
779 sll->sll_family = AF_PACKET;
780 sll->sll_hatype = dev->type;
781 sll->sll_protocol = skb->protocol;
782 sll->sll_pkttype = skb->pkt_type;
783 if (unlikely(po->origdev))
784 sll->sll_ifindex = orig_dev->ifindex;
785 else
786 sll->sll_ifindex = dev->ifindex;
787
788 __packet_set_status(po, h.raw, status);
789 smp_mb();
790 {
791 struct page *p_start, *p_end;
792 u8 *h_end = h.raw + macoff + snaplen - 1;
793
794 p_start = virt_to_page(h.raw);
795 p_end = virt_to_page(h_end);
796 while (p_start <= p_end) {
797 flush_dcache_page(p_start);
798 p_start++;
799 }
800 }
801
802 sk->sk_data_ready(sk, 0);
803
804 drop_n_restore:
805 if (skb_head != skb->data && skb_shared(skb)) {
806 skb->data = skb_head;
807 skb->len = skb_len;
808 }
809 drop:
810 kfree_skb(skb);
811 return 0;
812
813 ring_is_full:
814 po->stats.tp_drops++;
815 spin_unlock(&sk->sk_receive_queue.lock);
816
817 sk->sk_data_ready(sk, 0);
818 kfree_skb(copy_skb);
819 goto drop_n_restore;
820 }
821
822 static void tpacket_destruct_skb(struct sk_buff *skb)
823 {
824 struct packet_sock *po = pkt_sk(skb->sk);
825 void *ph;
826
827 BUG_ON(skb == NULL);
828
829 if (likely(po->tx_ring.pg_vec)) {
830 ph = skb_shinfo(skb)->destructor_arg;
831 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
832 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
833 atomic_dec(&po->tx_ring.pending);
834 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
835 }
836
837 sock_wfree(skb);
838 }
839
840 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
841 void *frame, struct net_device *dev, int size_max,
842 __be16 proto, unsigned char *addr)
843 {
844 union {
845 struct tpacket_hdr *h1;
846 struct tpacket2_hdr *h2;
847 void *raw;
848 } ph;
849 int to_write, offset, len, tp_len, nr_frags, len_max;
850 struct socket *sock = po->sk.sk_socket;
851 struct page *page;
852 void *data;
853 int err;
854
855 ph.raw = frame;
856
857 skb->protocol = proto;
858 skb->dev = dev;
859 skb->priority = po->sk.sk_priority;
860 skb->mark = po->sk.sk_mark;
861 skb_shinfo(skb)->destructor_arg = ph.raw;
862
863 switch (po->tp_version) {
864 case TPACKET_V2:
865 tp_len = ph.h2->tp_len;
866 break;
867 default:
868 tp_len = ph.h1->tp_len;
869 break;
870 }
871 if (unlikely(tp_len > size_max)) {
872 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
873 return -EMSGSIZE;
874 }
875
876 skb_reserve(skb, LL_RESERVED_SPACE(dev));
877 skb_reset_network_header(skb);
878
879 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
880 to_write = tp_len;
881
882 if (sock->type == SOCK_DGRAM) {
883 err = dev_hard_header(skb, dev, ntohs(proto), addr,
884 NULL, tp_len);
885 if (unlikely(err < 0))
886 return -EINVAL;
887 } else if (dev->hard_header_len) {
888 /* net device doesn't like empty head */
889 if (unlikely(tp_len <= dev->hard_header_len)) {
890 pr_err("packet size is too short (%d < %d)\n",
891 tp_len, 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 pr_err("Packet exceed the number of skb frags(%lu)\n",
921 MAX_SKB_FRAGS);
922 return -EFAULT;
923 }
924
925 flush_dcache_page(page);
926 get_page(page);
927 skb_fill_page_desc(skb,
928 nr_frags,
929 page++, offset, len);
930 to_write -= len;
931 offset = 0;
932 len_max = PAGE_SIZE;
933 len = ((to_write > len_max) ? len_max : to_write);
934 }
935
936 return tp_len;
937 }
938
939 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
940 {
941 struct socket *sock;
942 struct sk_buff *skb;
943 struct net_device *dev;
944 __be16 proto;
945 int ifindex, err, reserve = 0;
946 void *ph;
947 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
948 int tp_len, size_max;
949 unsigned char *addr;
950 int len_sum = 0;
951 int status = 0;
952
953 sock = po->sk.sk_socket;
954
955 mutex_lock(&po->pg_vec_lock);
956
957 err = -EBUSY;
958 if (saddr == NULL) {
959 ifindex = po->ifindex;
960 proto = po->num;
961 addr = NULL;
962 } else {
963 err = -EINVAL;
964 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
965 goto out;
966 if (msg->msg_namelen < (saddr->sll_halen
967 + offsetof(struct sockaddr_ll,
968 sll_addr)))
969 goto out;
970 ifindex = saddr->sll_ifindex;
971 proto = saddr->sll_protocol;
972 addr = saddr->sll_addr;
973 }
974
975 dev = dev_get_by_index(sock_net(&po->sk), ifindex);
976 err = -ENXIO;
977 if (unlikely(dev == NULL))
978 goto out;
979
980 reserve = dev->hard_header_len;
981
982 err = -ENETDOWN;
983 if (unlikely(!(dev->flags & IFF_UP)))
984 goto out_put;
985
986 size_max = po->tx_ring.frame_size
987 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
988
989 if (size_max > dev->mtu + reserve)
990 size_max = dev->mtu + reserve;
991
992 do {
993 ph = packet_current_frame(po, &po->tx_ring,
994 TP_STATUS_SEND_REQUEST);
995
996 if (unlikely(ph == NULL)) {
997 schedule();
998 continue;
999 }
1000
1001 status = TP_STATUS_SEND_REQUEST;
1002 skb = sock_alloc_send_skb(&po->sk,
1003 LL_ALLOCATED_SPACE(dev)
1004 + sizeof(struct sockaddr_ll),
1005 0, &err);
1006
1007 if (unlikely(skb == NULL))
1008 goto out_status;
1009
1010 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1011 addr);
1012
1013 if (unlikely(tp_len < 0)) {
1014 if (po->tp_loss) {
1015 __packet_set_status(po, ph,
1016 TP_STATUS_AVAILABLE);
1017 packet_increment_head(&po->tx_ring);
1018 kfree_skb(skb);
1019 continue;
1020 } else {
1021 status = TP_STATUS_WRONG_FORMAT;
1022 err = tp_len;
1023 goto out_status;
1024 }
1025 }
1026
1027 skb->destructor = tpacket_destruct_skb;
1028 __packet_set_status(po, ph, TP_STATUS_SENDING);
1029 atomic_inc(&po->tx_ring.pending);
1030
1031 status = TP_STATUS_SEND_REQUEST;
1032 err = dev_queue_xmit(skb);
1033 if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0))
1034 goto out_xmit;
1035 packet_increment_head(&po->tx_ring);
1036 len_sum += tp_len;
1037 } while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT))
1038 && (atomic_read(&po->tx_ring.pending))))
1039 );
1040
1041 err = len_sum;
1042 goto out_put;
1043
1044 out_xmit:
1045 skb->destructor = sock_wfree;
1046 atomic_dec(&po->tx_ring.pending);
1047 out_status:
1048 __packet_set_status(po, ph, status);
1049 kfree_skb(skb);
1050 out_put:
1051 dev_put(dev);
1052 out:
1053 mutex_unlock(&po->pg_vec_lock);
1054 return err;
1055 }
1056 #endif
1057
1058 static int packet_snd(struct socket *sock,
1059 struct msghdr *msg, size_t len)
1060 {
1061 struct sock *sk = sock->sk;
1062 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1063 struct sk_buff *skb;
1064 struct net_device *dev;
1065 __be16 proto;
1066 unsigned char *addr;
1067 int ifindex, err, reserve = 0;
1068
1069 /*
1070 * Get and verify the address.
1071 */
1072
1073 if (saddr == NULL) {
1074 struct packet_sock *po = pkt_sk(sk);
1075
1076 ifindex = po->ifindex;
1077 proto = po->num;
1078 addr = NULL;
1079 } else {
1080 err = -EINVAL;
1081 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1082 goto out;
1083 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1084 goto out;
1085 ifindex = saddr->sll_ifindex;
1086 proto = saddr->sll_protocol;
1087 addr = saddr->sll_addr;
1088 }
1089
1090
1091 dev = dev_get_by_index(sock_net(sk), ifindex);
1092 err = -ENXIO;
1093 if (dev == NULL)
1094 goto out_unlock;
1095 if (sock->type == SOCK_RAW)
1096 reserve = dev->hard_header_len;
1097
1098 err = -ENETDOWN;
1099 if (!(dev->flags & IFF_UP))
1100 goto out_unlock;
1101
1102 err = -EMSGSIZE;
1103 if (len > dev->mtu+reserve)
1104 goto out_unlock;
1105
1106 skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
1107 msg->msg_flags & MSG_DONTWAIT, &err);
1108 if (skb == NULL)
1109 goto out_unlock;
1110
1111 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1112 skb_reset_network_header(skb);
1113
1114 err = -EINVAL;
1115 if (sock->type == SOCK_DGRAM &&
1116 dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
1117 goto out_free;
1118
1119 /* Returns -EFAULT on error */
1120 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1121 if (err)
1122 goto out_free;
1123
1124 skb->protocol = proto;
1125 skb->dev = dev;
1126 skb->priority = sk->sk_priority;
1127 skb->mark = sk->sk_mark;
1128
1129 /*
1130 * Now send it
1131 */
1132
1133 err = dev_queue_xmit(skb);
1134 if (err > 0 && (err = net_xmit_errno(err)) != 0)
1135 goto out_unlock;
1136
1137 dev_put(dev);
1138
1139 return len;
1140
1141 out_free:
1142 kfree_skb(skb);
1143 out_unlock:
1144 if (dev)
1145 dev_put(dev);
1146 out:
1147 return err;
1148 }
1149
1150 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1151 struct msghdr *msg, size_t len)
1152 {
1153 #ifdef CONFIG_PACKET_MMAP
1154 struct sock *sk = sock->sk;
1155 struct packet_sock *po = pkt_sk(sk);
1156 if (po->tx_ring.pg_vec)
1157 return tpacket_snd(po, msg);
1158 else
1159 #endif
1160 return packet_snd(sock, msg, len);
1161 }
1162
1163 /*
1164 * Close a PACKET socket. This is fairly simple. We immediately go
1165 * to 'closed' state and remove our protocol entry in the device list.
1166 */
1167
1168 static int packet_release(struct socket *sock)
1169 {
1170 struct sock *sk = sock->sk;
1171 struct packet_sock *po;
1172 struct net *net;
1173 #ifdef CONFIG_PACKET_MMAP
1174 struct tpacket_req req;
1175 #endif
1176
1177 if (!sk)
1178 return 0;
1179
1180 net = sock_net(sk);
1181 po = pkt_sk(sk);
1182
1183 write_lock_bh(&net->packet.sklist_lock);
1184 sk_del_node_init(sk);
1185 sock_prot_inuse_add(net, sk->sk_prot, -1);
1186 write_unlock_bh(&net->packet.sklist_lock);
1187
1188 /*
1189 * Unhook packet receive handler.
1190 */
1191
1192 if (po->running) {
1193 /*
1194 * Remove the protocol hook
1195 */
1196 dev_remove_pack(&po->prot_hook);
1197 po->running = 0;
1198 po->num = 0;
1199 __sock_put(sk);
1200 }
1201
1202 packet_flush_mclist(sk);
1203
1204 #ifdef CONFIG_PACKET_MMAP
1205 memset(&req, 0, sizeof(req));
1206
1207 if (po->rx_ring.pg_vec)
1208 packet_set_ring(sk, &req, 1, 0);
1209
1210 if (po->tx_ring.pg_vec)
1211 packet_set_ring(sk, &req, 1, 1);
1212 #endif
1213
1214 /*
1215 * Now the socket is dead. No more input will appear.
1216 */
1217
1218 sock_orphan(sk);
1219 sock->sk = NULL;
1220
1221 /* Purge queues */
1222
1223 skb_queue_purge(&sk->sk_receive_queue);
1224 sk_refcnt_debug_release(sk);
1225
1226 sock_put(sk);
1227 return 0;
1228 }
1229
1230 /*
1231 * Attach a packet hook.
1232 */
1233
1234 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1235 {
1236 struct packet_sock *po = pkt_sk(sk);
1237 /*
1238 * Detach an existing hook if present.
1239 */
1240
1241 lock_sock(sk);
1242
1243 spin_lock(&po->bind_lock);
1244 if (po->running) {
1245 __sock_put(sk);
1246 po->running = 0;
1247 po->num = 0;
1248 spin_unlock(&po->bind_lock);
1249 dev_remove_pack(&po->prot_hook);
1250 spin_lock(&po->bind_lock);
1251 }
1252
1253 po->num = protocol;
1254 po->prot_hook.type = protocol;
1255 po->prot_hook.dev = dev;
1256
1257 po->ifindex = dev ? dev->ifindex : 0;
1258
1259 if (protocol == 0)
1260 goto out_unlock;
1261
1262 if (!dev || (dev->flags & IFF_UP)) {
1263 dev_add_pack(&po->prot_hook);
1264 sock_hold(sk);
1265 po->running = 1;
1266 } else {
1267 sk->sk_err = ENETDOWN;
1268 if (!sock_flag(sk, SOCK_DEAD))
1269 sk->sk_error_report(sk);
1270 }
1271
1272 out_unlock:
1273 spin_unlock(&po->bind_lock);
1274 release_sock(sk);
1275 return 0;
1276 }
1277
1278 /*
1279 * Bind a packet socket to a device
1280 */
1281
1282 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
1283 int addr_len)
1284 {
1285 struct sock *sk = sock->sk;
1286 char name[15];
1287 struct net_device *dev;
1288 int err = -ENODEV;
1289
1290 /*
1291 * Check legality
1292 */
1293
1294 if (addr_len != sizeof(struct sockaddr))
1295 return -EINVAL;
1296 strlcpy(name, uaddr->sa_data, sizeof(name));
1297
1298 dev = dev_get_by_name(sock_net(sk), name);
1299 if (dev) {
1300 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1301 dev_put(dev);
1302 }
1303 return err;
1304 }
1305
1306 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1307 {
1308 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1309 struct sock *sk = sock->sk;
1310 struct net_device *dev = NULL;
1311 int err;
1312
1313
1314 /*
1315 * Check legality
1316 */
1317
1318 if (addr_len < sizeof(struct sockaddr_ll))
1319 return -EINVAL;
1320 if (sll->sll_family != AF_PACKET)
1321 return -EINVAL;
1322
1323 if (sll->sll_ifindex) {
1324 err = -ENODEV;
1325 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1326 if (dev == NULL)
1327 goto out;
1328 }
1329 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1330 if (dev)
1331 dev_put(dev);
1332
1333 out:
1334 return err;
1335 }
1336
1337 static struct proto packet_proto = {
1338 .name = "PACKET",
1339 .owner = THIS_MODULE,
1340 .obj_size = sizeof(struct packet_sock),
1341 };
1342
1343 /*
1344 * Create a packet of type SOCK_PACKET.
1345 */
1346
1347 static int packet_create(struct net *net, struct socket *sock, int protocol)
1348 {
1349 struct sock *sk;
1350 struct packet_sock *po;
1351 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1352 int err;
1353
1354 if (!capable(CAP_NET_RAW))
1355 return -EPERM;
1356 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1357 sock->type != SOCK_PACKET)
1358 return -ESOCKTNOSUPPORT;
1359
1360 sock->state = SS_UNCONNECTED;
1361
1362 err = -ENOBUFS;
1363 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1364 if (sk == NULL)
1365 goto out;
1366
1367 sock->ops = &packet_ops;
1368 if (sock->type == SOCK_PACKET)
1369 sock->ops = &packet_ops_spkt;
1370
1371 sock_init_data(sock, sk);
1372
1373 po = pkt_sk(sk);
1374 sk->sk_family = PF_PACKET;
1375 po->num = proto;
1376
1377 sk->sk_destruct = packet_sock_destruct;
1378 sk_refcnt_debug_inc(sk);
1379
1380 /*
1381 * Attach a protocol block
1382 */
1383
1384 spin_lock_init(&po->bind_lock);
1385 mutex_init(&po->pg_vec_lock);
1386 po->prot_hook.func = packet_rcv;
1387
1388 if (sock->type == SOCK_PACKET)
1389 po->prot_hook.func = packet_rcv_spkt;
1390
1391 po->prot_hook.af_packet_priv = sk;
1392
1393 if (proto) {
1394 po->prot_hook.type = proto;
1395 dev_add_pack(&po->prot_hook);
1396 sock_hold(sk);
1397 po->running = 1;
1398 }
1399
1400 write_lock_bh(&net->packet.sklist_lock);
1401 sk_add_node(sk, &net->packet.sklist);
1402 sock_prot_inuse_add(net, &packet_proto, 1);
1403 write_unlock_bh(&net->packet.sklist_lock);
1404 return 0;
1405 out:
1406 return err;
1407 }
1408
1409 /*
1410 * Pull a packet from our receive queue and hand it to the user.
1411 * If necessary we block.
1412 */
1413
1414 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1415 struct msghdr *msg, size_t len, int flags)
1416 {
1417 struct sock *sk = sock->sk;
1418 struct sk_buff *skb;
1419 int copied, err;
1420 struct sockaddr_ll *sll;
1421
1422 err = -EINVAL;
1423 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
1424 goto out;
1425
1426 #if 0
1427 /* What error should we return now? EUNATTACH? */
1428 if (pkt_sk(sk)->ifindex < 0)
1429 return -ENODEV;
1430 #endif
1431
1432 /*
1433 * Call the generic datagram receiver. This handles all sorts
1434 * of horrible races and re-entrancy so we can forget about it
1435 * in the protocol layers.
1436 *
1437 * Now it will return ENETDOWN, if device have just gone down,
1438 * but then it will block.
1439 */
1440
1441 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1442
1443 /*
1444 * An error occurred so return it. Because skb_recv_datagram()
1445 * handles the blocking we don't see and worry about blocking
1446 * retries.
1447 */
1448
1449 if (skb == NULL)
1450 goto out;
1451
1452 /*
1453 * If the address length field is there to be filled in, we fill
1454 * it in now.
1455 */
1456
1457 sll = &PACKET_SKB_CB(skb)->sa.ll;
1458 if (sock->type == SOCK_PACKET)
1459 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1460 else
1461 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1462
1463 /*
1464 * You lose any data beyond the buffer you gave. If it worries a
1465 * user program they can ask the device for its MTU anyway.
1466 */
1467
1468 copied = skb->len;
1469 if (copied > len) {
1470 copied = len;
1471 msg->msg_flags |= MSG_TRUNC;
1472 }
1473
1474 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1475 if (err)
1476 goto out_free;
1477
1478 sock_recv_ts_and_drops(msg, sk, skb);
1479
1480 if (msg->msg_name)
1481 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1482 msg->msg_namelen);
1483
1484 if (pkt_sk(sk)->auxdata) {
1485 struct tpacket_auxdata aux;
1486
1487 aux.tp_status = TP_STATUS_USER;
1488 if (skb->ip_summed == CHECKSUM_PARTIAL)
1489 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1490 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1491 aux.tp_snaplen = skb->len;
1492 aux.tp_mac = 0;
1493 aux.tp_net = skb_network_offset(skb);
1494 aux.tp_vlan_tci = vlan_tx_tag_get(skb);
1495
1496 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1497 }
1498
1499 /*
1500 * Free or return the buffer as appropriate. Again this
1501 * hides all the races and re-entrancy issues from us.
1502 */
1503 err = (flags&MSG_TRUNC) ? skb->len : copied;
1504
1505 out_free:
1506 skb_free_datagram(sk, skb);
1507 out:
1508 return err;
1509 }
1510
1511 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1512 int *uaddr_len, int peer)
1513 {
1514 struct net_device *dev;
1515 struct sock *sk = sock->sk;
1516
1517 if (peer)
1518 return -EOPNOTSUPP;
1519
1520 uaddr->sa_family = AF_PACKET;
1521 dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex);
1522 if (dev) {
1523 strlcpy(uaddr->sa_data, dev->name, 15);
1524 dev_put(dev);
1525 } else
1526 memset(uaddr->sa_data, 0, 14);
1527 *uaddr_len = sizeof(*uaddr);
1528
1529 return 0;
1530 }
1531
1532 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1533 int *uaddr_len, int peer)
1534 {
1535 struct net_device *dev;
1536 struct sock *sk = sock->sk;
1537 struct packet_sock *po = pkt_sk(sk);
1538 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1539
1540 if (peer)
1541 return -EOPNOTSUPP;
1542
1543 sll->sll_family = AF_PACKET;
1544 sll->sll_ifindex = po->ifindex;
1545 sll->sll_protocol = po->num;
1546 dev = dev_get_by_index(sock_net(sk), po->ifindex);
1547 if (dev) {
1548 sll->sll_hatype = dev->type;
1549 sll->sll_halen = dev->addr_len;
1550 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1551 dev_put(dev);
1552 } else {
1553 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1554 sll->sll_halen = 0;
1555 }
1556 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1557
1558 return 0;
1559 }
1560
1561 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1562 int what)
1563 {
1564 switch (i->type) {
1565 case PACKET_MR_MULTICAST:
1566 if (what > 0)
1567 return dev_mc_add(dev, i->addr, i->alen, 0);
1568 else
1569 return dev_mc_delete(dev, i->addr, i->alen, 0);
1570 break;
1571 case PACKET_MR_PROMISC:
1572 return dev_set_promiscuity(dev, what);
1573 break;
1574 case PACKET_MR_ALLMULTI:
1575 return dev_set_allmulti(dev, what);
1576 break;
1577 case PACKET_MR_UNICAST:
1578 if (what > 0)
1579 return dev_unicast_add(dev, i->addr);
1580 else
1581 return dev_unicast_delete(dev, i->addr);
1582 break;
1583 default:
1584 break;
1585 }
1586 return 0;
1587 }
1588
1589 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1590 {
1591 for ( ; i; i = i->next) {
1592 if (i->ifindex == dev->ifindex)
1593 packet_dev_mc(dev, i, what);
1594 }
1595 }
1596
1597 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1598 {
1599 struct packet_sock *po = pkt_sk(sk);
1600 struct packet_mclist *ml, *i;
1601 struct net_device *dev;
1602 int err;
1603
1604 rtnl_lock();
1605
1606 err = -ENODEV;
1607 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1608 if (!dev)
1609 goto done;
1610
1611 err = -EINVAL;
1612 if (mreq->mr_alen > dev->addr_len)
1613 goto done;
1614
1615 err = -ENOBUFS;
1616 i = kmalloc(sizeof(*i), GFP_KERNEL);
1617 if (i == NULL)
1618 goto done;
1619
1620 err = 0;
1621 for (ml = po->mclist; ml; ml = ml->next) {
1622 if (ml->ifindex == mreq->mr_ifindex &&
1623 ml->type == mreq->mr_type &&
1624 ml->alen == mreq->mr_alen &&
1625 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1626 ml->count++;
1627 /* Free the new element ... */
1628 kfree(i);
1629 goto done;
1630 }
1631 }
1632
1633 i->type = mreq->mr_type;
1634 i->ifindex = mreq->mr_ifindex;
1635 i->alen = mreq->mr_alen;
1636 memcpy(i->addr, mreq->mr_address, i->alen);
1637 i->count = 1;
1638 i->next = po->mclist;
1639 po->mclist = i;
1640 err = packet_dev_mc(dev, i, 1);
1641 if (err) {
1642 po->mclist = i->next;
1643 kfree(i);
1644 }
1645
1646 done:
1647 rtnl_unlock();
1648 return err;
1649 }
1650
1651 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1652 {
1653 struct packet_mclist *ml, **mlp;
1654
1655 rtnl_lock();
1656
1657 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1658 if (ml->ifindex == mreq->mr_ifindex &&
1659 ml->type == mreq->mr_type &&
1660 ml->alen == mreq->mr_alen &&
1661 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1662 if (--ml->count == 0) {
1663 struct net_device *dev;
1664 *mlp = ml->next;
1665 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1666 if (dev)
1667 packet_dev_mc(dev, ml, -1);
1668 kfree(ml);
1669 }
1670 rtnl_unlock();
1671 return 0;
1672 }
1673 }
1674 rtnl_unlock();
1675 return -EADDRNOTAVAIL;
1676 }
1677
1678 static void packet_flush_mclist(struct sock *sk)
1679 {
1680 struct packet_sock *po = pkt_sk(sk);
1681 struct packet_mclist *ml;
1682
1683 if (!po->mclist)
1684 return;
1685
1686 rtnl_lock();
1687 while ((ml = po->mclist) != NULL) {
1688 struct net_device *dev;
1689
1690 po->mclist = ml->next;
1691 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1692 if (dev != NULL)
1693 packet_dev_mc(dev, ml, -1);
1694 kfree(ml);
1695 }
1696 rtnl_unlock();
1697 }
1698
1699 static int
1700 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1701 {
1702 struct sock *sk = sock->sk;
1703 struct packet_sock *po = pkt_sk(sk);
1704 int ret;
1705
1706 if (level != SOL_PACKET)
1707 return -ENOPROTOOPT;
1708
1709 switch (optname) {
1710 case PACKET_ADD_MEMBERSHIP:
1711 case PACKET_DROP_MEMBERSHIP:
1712 {
1713 struct packet_mreq_max mreq;
1714 int len = optlen;
1715 memset(&mreq, 0, sizeof(mreq));
1716 if (len < sizeof(struct packet_mreq))
1717 return -EINVAL;
1718 if (len > sizeof(mreq))
1719 len = sizeof(mreq);
1720 if (copy_from_user(&mreq, optval, len))
1721 return -EFAULT;
1722 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1723 return -EINVAL;
1724 if (optname == PACKET_ADD_MEMBERSHIP)
1725 ret = packet_mc_add(sk, &mreq);
1726 else
1727 ret = packet_mc_drop(sk, &mreq);
1728 return ret;
1729 }
1730
1731 #ifdef CONFIG_PACKET_MMAP
1732 case PACKET_RX_RING:
1733 case PACKET_TX_RING:
1734 {
1735 struct tpacket_req req;
1736
1737 if (optlen < sizeof(req))
1738 return -EINVAL;
1739 if (copy_from_user(&req, optval, sizeof(req)))
1740 return -EFAULT;
1741 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
1742 }
1743 case PACKET_COPY_THRESH:
1744 {
1745 int val;
1746
1747 if (optlen != sizeof(val))
1748 return -EINVAL;
1749 if (copy_from_user(&val, optval, sizeof(val)))
1750 return -EFAULT;
1751
1752 pkt_sk(sk)->copy_thresh = val;
1753 return 0;
1754 }
1755 case PACKET_VERSION:
1756 {
1757 int val;
1758
1759 if (optlen != sizeof(val))
1760 return -EINVAL;
1761 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1762 return -EBUSY;
1763 if (copy_from_user(&val, optval, sizeof(val)))
1764 return -EFAULT;
1765 switch (val) {
1766 case TPACKET_V1:
1767 case TPACKET_V2:
1768 po->tp_version = val;
1769 return 0;
1770 default:
1771 return -EINVAL;
1772 }
1773 }
1774 case PACKET_RESERVE:
1775 {
1776 unsigned int val;
1777
1778 if (optlen != sizeof(val))
1779 return -EINVAL;
1780 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1781 return -EBUSY;
1782 if (copy_from_user(&val, optval, sizeof(val)))
1783 return -EFAULT;
1784 po->tp_reserve = val;
1785 return 0;
1786 }
1787 case PACKET_LOSS:
1788 {
1789 unsigned int val;
1790
1791 if (optlen != sizeof(val))
1792 return -EINVAL;
1793 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1794 return -EBUSY;
1795 if (copy_from_user(&val, optval, sizeof(val)))
1796 return -EFAULT;
1797 po->tp_loss = !!val;
1798 return 0;
1799 }
1800 #endif
1801 case PACKET_AUXDATA:
1802 {
1803 int val;
1804
1805 if (optlen < sizeof(val))
1806 return -EINVAL;
1807 if (copy_from_user(&val, optval, sizeof(val)))
1808 return -EFAULT;
1809
1810 po->auxdata = !!val;
1811 return 0;
1812 }
1813 case PACKET_ORIGDEV:
1814 {
1815 int val;
1816
1817 if (optlen < sizeof(val))
1818 return -EINVAL;
1819 if (copy_from_user(&val, optval, sizeof(val)))
1820 return -EFAULT;
1821
1822 po->origdev = !!val;
1823 return 0;
1824 }
1825 default:
1826 return -ENOPROTOOPT;
1827 }
1828 }
1829
1830 static int packet_getsockopt(struct socket *sock, int level, int optname,
1831 char __user *optval, int __user *optlen)
1832 {
1833 int len;
1834 int val;
1835 struct sock *sk = sock->sk;
1836 struct packet_sock *po = pkt_sk(sk);
1837 void *data;
1838 struct tpacket_stats st;
1839
1840 if (level != SOL_PACKET)
1841 return -ENOPROTOOPT;
1842
1843 if (get_user(len, optlen))
1844 return -EFAULT;
1845
1846 if (len < 0)
1847 return -EINVAL;
1848
1849 switch (optname) {
1850 case PACKET_STATISTICS:
1851 if (len > sizeof(struct tpacket_stats))
1852 len = sizeof(struct tpacket_stats);
1853 spin_lock_bh(&sk->sk_receive_queue.lock);
1854 st = po->stats;
1855 memset(&po->stats, 0, sizeof(st));
1856 spin_unlock_bh(&sk->sk_receive_queue.lock);
1857 st.tp_packets += st.tp_drops;
1858
1859 data = &st;
1860 break;
1861 case PACKET_AUXDATA:
1862 if (len > sizeof(int))
1863 len = sizeof(int);
1864 val = po->auxdata;
1865
1866 data = &val;
1867 break;
1868 case PACKET_ORIGDEV:
1869 if (len > sizeof(int))
1870 len = sizeof(int);
1871 val = po->origdev;
1872
1873 data = &val;
1874 break;
1875 #ifdef CONFIG_PACKET_MMAP
1876 case PACKET_VERSION:
1877 if (len > sizeof(int))
1878 len = sizeof(int);
1879 val = po->tp_version;
1880 data = &val;
1881 break;
1882 case PACKET_HDRLEN:
1883 if (len > sizeof(int))
1884 len = sizeof(int);
1885 if (copy_from_user(&val, optval, len))
1886 return -EFAULT;
1887 switch (val) {
1888 case TPACKET_V1:
1889 val = sizeof(struct tpacket_hdr);
1890 break;
1891 case TPACKET_V2:
1892 val = sizeof(struct tpacket2_hdr);
1893 break;
1894 default:
1895 return -EINVAL;
1896 }
1897 data = &val;
1898 break;
1899 case PACKET_RESERVE:
1900 if (len > sizeof(unsigned int))
1901 len = sizeof(unsigned int);
1902 val = po->tp_reserve;
1903 data = &val;
1904 break;
1905 case PACKET_LOSS:
1906 if (len > sizeof(unsigned int))
1907 len = sizeof(unsigned int);
1908 val = po->tp_loss;
1909 data = &val;
1910 break;
1911 #endif
1912 default:
1913 return -ENOPROTOOPT;
1914 }
1915
1916 if (put_user(len, optlen))
1917 return -EFAULT;
1918 if (copy_to_user(optval, data, len))
1919 return -EFAULT;
1920 return 0;
1921 }
1922
1923
1924 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
1925 {
1926 struct sock *sk;
1927 struct hlist_node *node;
1928 struct net_device *dev = data;
1929 struct net *net = dev_net(dev);
1930
1931 read_lock(&net->packet.sklist_lock);
1932 sk_for_each(sk, node, &net->packet.sklist) {
1933 struct packet_sock *po = pkt_sk(sk);
1934
1935 switch (msg) {
1936 case NETDEV_UNREGISTER:
1937 if (po->mclist)
1938 packet_dev_mclist(dev, po->mclist, -1);
1939 /* fallthrough */
1940
1941 case NETDEV_DOWN:
1942 if (dev->ifindex == po->ifindex) {
1943 spin_lock(&po->bind_lock);
1944 if (po->running) {
1945 __dev_remove_pack(&po->prot_hook);
1946 __sock_put(sk);
1947 po->running = 0;
1948 sk->sk_err = ENETDOWN;
1949 if (!sock_flag(sk, SOCK_DEAD))
1950 sk->sk_error_report(sk);
1951 }
1952 if (msg == NETDEV_UNREGISTER) {
1953 po->ifindex = -1;
1954 po->prot_hook.dev = NULL;
1955 }
1956 spin_unlock(&po->bind_lock);
1957 }
1958 break;
1959 case NETDEV_UP:
1960 spin_lock(&po->bind_lock);
1961 if (dev->ifindex == po->ifindex && po->num &&
1962 !po->running) {
1963 dev_add_pack(&po->prot_hook);
1964 sock_hold(sk);
1965 po->running = 1;
1966 }
1967 spin_unlock(&po->bind_lock);
1968 break;
1969 }
1970 }
1971 read_unlock(&net->packet.sklist_lock);
1972 return NOTIFY_DONE;
1973 }
1974
1975
1976 static int packet_ioctl(struct socket *sock, unsigned int cmd,
1977 unsigned long arg)
1978 {
1979 struct sock *sk = sock->sk;
1980
1981 switch (cmd) {
1982 case SIOCOUTQ:
1983 {
1984 int amount = sk_wmem_alloc_get(sk);
1985
1986 return put_user(amount, (int __user *)arg);
1987 }
1988 case SIOCINQ:
1989 {
1990 struct sk_buff *skb;
1991 int amount = 0;
1992
1993 spin_lock_bh(&sk->sk_receive_queue.lock);
1994 skb = skb_peek(&sk->sk_receive_queue);
1995 if (skb)
1996 amount = skb->len;
1997 spin_unlock_bh(&sk->sk_receive_queue.lock);
1998 return put_user(amount, (int __user *)arg);
1999 }
2000 case SIOCGSTAMP:
2001 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2002 case SIOCGSTAMPNS:
2003 return sock_get_timestampns(sk, (struct timespec __user *)arg);
2004
2005 #ifdef CONFIG_INET
2006 case SIOCADDRT:
2007 case SIOCDELRT:
2008 case SIOCDARP:
2009 case SIOCGARP:
2010 case SIOCSARP:
2011 case SIOCGIFADDR:
2012 case SIOCSIFADDR:
2013 case SIOCGIFBRDADDR:
2014 case SIOCSIFBRDADDR:
2015 case SIOCGIFNETMASK:
2016 case SIOCSIFNETMASK:
2017 case SIOCGIFDSTADDR:
2018 case SIOCSIFDSTADDR:
2019 case SIOCSIFFLAGS:
2020 if (!net_eq(sock_net(sk), &init_net))
2021 return -ENOIOCTLCMD;
2022 return inet_dgram_ops.ioctl(sock, cmd, arg);
2023 #endif
2024
2025 default:
2026 return -ENOIOCTLCMD;
2027 }
2028 return 0;
2029 }
2030
2031 #ifndef CONFIG_PACKET_MMAP
2032 #define packet_mmap sock_no_mmap
2033 #define packet_poll datagram_poll
2034 #else
2035
2036 static unsigned int packet_poll(struct file *file, struct socket *sock,
2037 poll_table *wait)
2038 {
2039 struct sock *sk = sock->sk;
2040 struct packet_sock *po = pkt_sk(sk);
2041 unsigned int mask = datagram_poll(file, sock, wait);
2042
2043 spin_lock_bh(&sk->sk_receive_queue.lock);
2044 if (po->rx_ring.pg_vec) {
2045 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
2046 mask |= POLLIN | POLLRDNORM;
2047 }
2048 spin_unlock_bh(&sk->sk_receive_queue.lock);
2049 spin_lock_bh(&sk->sk_write_queue.lock);
2050 if (po->tx_ring.pg_vec) {
2051 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2052 mask |= POLLOUT | POLLWRNORM;
2053 }
2054 spin_unlock_bh(&sk->sk_write_queue.lock);
2055 return mask;
2056 }
2057
2058
2059 /* Dirty? Well, I still did not learn better way to account
2060 * for user mmaps.
2061 */
2062
2063 static void packet_mm_open(struct vm_area_struct *vma)
2064 {
2065 struct file *file = vma->vm_file;
2066 struct socket *sock = file->private_data;
2067 struct sock *sk = sock->sk;
2068
2069 if (sk)
2070 atomic_inc(&pkt_sk(sk)->mapped);
2071 }
2072
2073 static void packet_mm_close(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_dec(&pkt_sk(sk)->mapped);
2081 }
2082
2083 static const struct vm_operations_struct packet_mmap_ops = {
2084 .open = packet_mm_open,
2085 .close = packet_mm_close,
2086 };
2087
2088 static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
2089 {
2090 int i;
2091
2092 for (i = 0; i < len; i++) {
2093 if (likely(pg_vec[i]))
2094 free_pages((unsigned long) pg_vec[i], order);
2095 }
2096 kfree(pg_vec);
2097 }
2098
2099 static inline char *alloc_one_pg_vec_page(unsigned long order)
2100 {
2101 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;
2102
2103 return (char *) __get_free_pages(gfp_flags, order);
2104 }
2105
2106 static char **alloc_pg_vec(struct tpacket_req *req, int order)
2107 {
2108 unsigned int block_nr = req->tp_block_nr;
2109 char **pg_vec;
2110 int i;
2111
2112 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
2113 if (unlikely(!pg_vec))
2114 goto out;
2115
2116 for (i = 0; i < block_nr; i++) {
2117 pg_vec[i] = alloc_one_pg_vec_page(order);
2118 if (unlikely(!pg_vec[i]))
2119 goto out_free_pgvec;
2120 }
2121
2122 out:
2123 return pg_vec;
2124
2125 out_free_pgvec:
2126 free_pg_vec(pg_vec, order, block_nr);
2127 pg_vec = NULL;
2128 goto out;
2129 }
2130
2131 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2132 int closing, int tx_ring)
2133 {
2134 char **pg_vec = NULL;
2135 struct packet_sock *po = pkt_sk(sk);
2136 int was_running, order = 0;
2137 struct packet_ring_buffer *rb;
2138 struct sk_buff_head *rb_queue;
2139 __be16 num;
2140 int err;
2141
2142 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2143 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2144
2145 err = -EBUSY;
2146 if (!closing) {
2147 if (atomic_read(&po->mapped))
2148 goto out;
2149 if (atomic_read(&rb->pending))
2150 goto out;
2151 }
2152
2153 if (req->tp_block_nr) {
2154 /* Sanity tests and some calculations */
2155 err = -EBUSY;
2156 if (unlikely(rb->pg_vec))
2157 goto out;
2158
2159 switch (po->tp_version) {
2160 case TPACKET_V1:
2161 po->tp_hdrlen = TPACKET_HDRLEN;
2162 break;
2163 case TPACKET_V2:
2164 po->tp_hdrlen = TPACKET2_HDRLEN;
2165 break;
2166 }
2167
2168 err = -EINVAL;
2169 if (unlikely((int)req->tp_block_size <= 0))
2170 goto out;
2171 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
2172 goto out;
2173 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
2174 po->tp_reserve))
2175 goto out;
2176 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
2177 goto out;
2178
2179 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2180 if (unlikely(rb->frames_per_block <= 0))
2181 goto out;
2182 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2183 req->tp_frame_nr))
2184 goto out;
2185
2186 err = -ENOMEM;
2187 order = get_order(req->tp_block_size);
2188 pg_vec = alloc_pg_vec(req, order);
2189 if (unlikely(!pg_vec))
2190 goto out;
2191 }
2192 /* Done */
2193 else {
2194 err = -EINVAL;
2195 if (unlikely(req->tp_frame_nr))
2196 goto out;
2197 }
2198
2199 lock_sock(sk);
2200
2201 /* Detach socket from network */
2202 spin_lock(&po->bind_lock);
2203 was_running = po->running;
2204 num = po->num;
2205 if (was_running) {
2206 __dev_remove_pack(&po->prot_hook);
2207 po->num = 0;
2208 po->running = 0;
2209 __sock_put(sk);
2210 }
2211 spin_unlock(&po->bind_lock);
2212
2213 synchronize_net();
2214
2215 err = -EBUSY;
2216 mutex_lock(&po->pg_vec_lock);
2217 if (closing || atomic_read(&po->mapped) == 0) {
2218 err = 0;
2219 #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
2220 spin_lock_bh(&rb_queue->lock);
2221 pg_vec = XC(rb->pg_vec, pg_vec);
2222 rb->frame_max = (req->tp_frame_nr - 1);
2223 rb->head = 0;
2224 rb->frame_size = req->tp_frame_size;
2225 spin_unlock_bh(&rb_queue->lock);
2226
2227 order = XC(rb->pg_vec_order, order);
2228 req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr);
2229
2230 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2231 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2232 tpacket_rcv : packet_rcv;
2233 skb_queue_purge(rb_queue);
2234 #undef XC
2235 if (atomic_read(&po->mapped))
2236 pr_err("packet_mmap: vma is busy: %d\n",
2237 atomic_read(&po->mapped));
2238 }
2239 mutex_unlock(&po->pg_vec_lock);
2240
2241 spin_lock(&po->bind_lock);
2242 if (was_running && !po->running) {
2243 sock_hold(sk);
2244 po->running = 1;
2245 po->num = num;
2246 dev_add_pack(&po->prot_hook);
2247 }
2248 spin_unlock(&po->bind_lock);
2249
2250 release_sock(sk);
2251
2252 if (pg_vec)
2253 free_pg_vec(pg_vec, order, req->tp_block_nr);
2254 out:
2255 return err;
2256 }
2257
2258 static int packet_mmap(struct file *file, struct socket *sock,
2259 struct vm_area_struct *vma)
2260 {
2261 struct sock *sk = sock->sk;
2262 struct packet_sock *po = pkt_sk(sk);
2263 unsigned long size, expected_size;
2264 struct packet_ring_buffer *rb;
2265 unsigned long start;
2266 int err = -EINVAL;
2267 int i;
2268
2269 if (vma->vm_pgoff)
2270 return -EINVAL;
2271
2272 mutex_lock(&po->pg_vec_lock);
2273
2274 expected_size = 0;
2275 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2276 if (rb->pg_vec) {
2277 expected_size += rb->pg_vec_len
2278 * rb->pg_vec_pages
2279 * PAGE_SIZE;
2280 }
2281 }
2282
2283 if (expected_size == 0)
2284 goto out;
2285
2286 size = vma->vm_end - vma->vm_start;
2287 if (size != expected_size)
2288 goto out;
2289
2290 start = vma->vm_start;
2291 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2292 if (rb->pg_vec == NULL)
2293 continue;
2294
2295 for (i = 0; i < rb->pg_vec_len; i++) {
2296 struct page *page = virt_to_page(rb->pg_vec[i]);
2297 int pg_num;
2298
2299 for (pg_num = 0; pg_num < rb->pg_vec_pages;
2300 pg_num++, page++) {
2301 err = vm_insert_page(vma, start, page);
2302 if (unlikely(err))
2303 goto out;
2304 start += PAGE_SIZE;
2305 }
2306 }
2307 }
2308
2309 atomic_inc(&po->mapped);
2310 vma->vm_ops = &packet_mmap_ops;
2311 err = 0;
2312
2313 out:
2314 mutex_unlock(&po->pg_vec_lock);
2315 return err;
2316 }
2317 #endif
2318
2319
2320 static const struct proto_ops packet_ops_spkt = {
2321 .family = PF_PACKET,
2322 .owner = THIS_MODULE,
2323 .release = packet_release,
2324 .bind = packet_bind_spkt,
2325 .connect = sock_no_connect,
2326 .socketpair = sock_no_socketpair,
2327 .accept = sock_no_accept,
2328 .getname = packet_getname_spkt,
2329 .poll = datagram_poll,
2330 .ioctl = packet_ioctl,
2331 .listen = sock_no_listen,
2332 .shutdown = sock_no_shutdown,
2333 .setsockopt = sock_no_setsockopt,
2334 .getsockopt = sock_no_getsockopt,
2335 .sendmsg = packet_sendmsg_spkt,
2336 .recvmsg = packet_recvmsg,
2337 .mmap = sock_no_mmap,
2338 .sendpage = sock_no_sendpage,
2339 };
2340
2341 static const struct proto_ops packet_ops = {
2342 .family = PF_PACKET,
2343 .owner = THIS_MODULE,
2344 .release = packet_release,
2345 .bind = packet_bind,
2346 .connect = sock_no_connect,
2347 .socketpair = sock_no_socketpair,
2348 .accept = sock_no_accept,
2349 .getname = packet_getname,
2350 .poll = packet_poll,
2351 .ioctl = packet_ioctl,
2352 .listen = sock_no_listen,
2353 .shutdown = sock_no_shutdown,
2354 .setsockopt = packet_setsockopt,
2355 .getsockopt = packet_getsockopt,
2356 .sendmsg = packet_sendmsg,
2357 .recvmsg = packet_recvmsg,
2358 .mmap = packet_mmap,
2359 .sendpage = sock_no_sendpage,
2360 };
2361
2362 static const struct net_proto_family packet_family_ops = {
2363 .family = PF_PACKET,
2364 .create = packet_create,
2365 .owner = THIS_MODULE,
2366 };
2367
2368 static struct notifier_block packet_netdev_notifier = {
2369 .notifier_call = packet_notifier,
2370 };
2371
2372 #ifdef CONFIG_PROC_FS
2373 static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
2374 {
2375 struct sock *s;
2376 struct hlist_node *node;
2377
2378 sk_for_each(s, node, &net->packet.sklist) {
2379 if (!off--)
2380 return s;
2381 }
2382 return NULL;
2383 }
2384
2385 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2386 __acquires(seq_file_net(seq)->packet.sklist_lock)
2387 {
2388 struct net *net = seq_file_net(seq);
2389 read_lock(&net->packet.sklist_lock);
2390 return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
2391 }
2392
2393 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2394 {
2395 struct net *net = seq_file_net(seq);
2396 ++*pos;
2397 return (v == SEQ_START_TOKEN)
2398 ? sk_head(&net->packet.sklist)
2399 : sk_next((struct sock *)v) ;
2400 }
2401
2402 static void packet_seq_stop(struct seq_file *seq, void *v)
2403 __releases(seq_file_net(seq)->packet.sklist_lock)
2404 {
2405 struct net *net = seq_file_net(seq);
2406 read_unlock(&net->packet.sklist_lock);
2407 }
2408
2409 static int packet_seq_show(struct seq_file *seq, void *v)
2410 {
2411 if (v == SEQ_START_TOKEN)
2412 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2413 else {
2414 struct sock *s = v;
2415 const struct packet_sock *po = pkt_sk(s);
2416
2417 seq_printf(seq,
2418 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2419 s,
2420 atomic_read(&s->sk_refcnt),
2421 s->sk_type,
2422 ntohs(po->num),
2423 po->ifindex,
2424 po->running,
2425 atomic_read(&s->sk_rmem_alloc),
2426 sock_i_uid(s),
2427 sock_i_ino(s));
2428 }
2429
2430 return 0;
2431 }
2432
2433 static const struct seq_operations packet_seq_ops = {
2434 .start = packet_seq_start,
2435 .next = packet_seq_next,
2436 .stop = packet_seq_stop,
2437 .show = packet_seq_show,
2438 };
2439
2440 static int packet_seq_open(struct inode *inode, struct file *file)
2441 {
2442 return seq_open_net(inode, file, &packet_seq_ops,
2443 sizeof(struct seq_net_private));
2444 }
2445
2446 static const struct file_operations packet_seq_fops = {
2447 .owner = THIS_MODULE,
2448 .open = packet_seq_open,
2449 .read = seq_read,
2450 .llseek = seq_lseek,
2451 .release = seq_release_net,
2452 };
2453
2454 #endif
2455
2456 static int packet_net_init(struct net *net)
2457 {
2458 rwlock_init(&net->packet.sklist_lock);
2459 INIT_HLIST_HEAD(&net->packet.sklist);
2460
2461 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2462 return -ENOMEM;
2463
2464 return 0;
2465 }
2466
2467 static void packet_net_exit(struct net *net)
2468 {
2469 proc_net_remove(net, "packet");
2470 }
2471
2472 static struct pernet_operations packet_net_ops = {
2473 .init = packet_net_init,
2474 .exit = packet_net_exit,
2475 };
2476
2477
2478 static void __exit packet_exit(void)
2479 {
2480 unregister_netdevice_notifier(&packet_netdev_notifier);
2481 unregister_pernet_subsys(&packet_net_ops);
2482 sock_unregister(PF_PACKET);
2483 proto_unregister(&packet_proto);
2484 }
2485
2486 static int __init packet_init(void)
2487 {
2488 int rc = proto_register(&packet_proto, 0);
2489
2490 if (rc != 0)
2491 goto out;
2492
2493 sock_register(&packet_family_ops);
2494 register_pernet_subsys(&packet_net_ops);
2495 register_netdevice_notifier(&packet_netdev_notifier);
2496 out:
2497 return rc;
2498 }
2499
2500 module_init(packet_init);
2501 module_exit(packet_exit);
2502 MODULE_LICENSE("GPL");
2503 MODULE_ALIAS_NETPROTO(PF_PACKET);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree