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udf: super.c Fix warning: variable 'sbi' set but not used
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / packet / af_packet.c
blob2078a277e06b53f4e89181f8f4bb6bca21f7264a
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * PACKET - implements raw packet sockets.
7 *
8 * Authors: Ross Biro
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
11 *
12 * Fixes:
13 * Alan Cox : verify_area() now used correctly
14 * Alan Cox : new skbuff lists, look ma no backlogs!
15 * Alan Cox : tidied skbuff lists.
16 * Alan Cox : Now uses generic datagram routines I
17 * added. Also fixed the peek/read crash
18 * from all old Linux datagram code.
19 * Alan Cox : Uses the improved datagram code.
20 * Alan Cox : Added NULL's for socket options.
21 * Alan Cox : Re-commented the code.
22 * Alan Cox : Use new kernel side addressing
23 * Rob Janssen : Correct MTU usage.
24 * Dave Platt : Counter leaks caused by incorrect
25 * interrupt locking and some slightly
26 * dubious gcc output. Can you read
27 * compiler: it said _VOLATILE_
28 * Richard Kooijman : Timestamp fixes.
29 * Alan Cox : New buffers. Use sk->mac.raw.
30 * Alan Cox : sendmsg/recvmsg support.
31 * Alan Cox : Protocol setting support
32 * Alexey Kuznetsov : Untied from IPv4 stack.
33 * Cyrus Durgin : Fixed kerneld for kmod.
34 * Michal Ostrowski : Module initialization cleanup.
35 * Ulises Alonso : Frame number limit removal and
36 * packet_set_ring memory leak.
37 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
40 * byte arrays at the end of sockaddr_ll
41 * and packet_mreq.
42 * Johann Baudy : Added TX RING.
43 *
44 * This program is free software; you can redistribute it and/or
45 * modify it under the terms of the GNU General Public License
46 * as published by the Free Software Foundation; either version
47 * 2 of the License, or (at your option) any later version.
48 *
49 */
50
51 #include <linux/types.h>
52 #include <linux/mm.h>
53 #include <linux/capability.h>
54 #include <linux/fcntl.h>
55 #include <linux/socket.h>
56 #include <linux/in.h>
57 #include <linux/inet.h>
58 #include <linux/netdevice.h>
59 #include <linux/if_packet.h>
60 #include <linux/wireless.h>
61 #include <linux/kernel.h>
62 #include <linux/kmod.h>
63 #include <linux/slab.h>
64 #include <net/net_namespace.h>
65 #include <net/ip.h>
66 #include <net/protocol.h>
67 #include <linux/skbuff.h>
68 #include <net/sock.h>
69 #include <linux/errno.h>
70 #include <linux/timer.h>
71 #include <asm/system.h>
72 #include <asm/uaccess.h>
73 #include <asm/ioctls.h>
74 #include <asm/page.h>
75 #include <asm/cacheflush.h>
76 #include <asm/io.h>
77 #include <linux/proc_fs.h>
78 #include <linux/seq_file.h>
79 #include <linux/poll.h>
80 #include <linux/module.h>
81 #include <linux/init.h>
82 #include <linux/mutex.h>
83 #include <linux/if_vlan.h>
84 #include <linux/virtio_net.h>
85 #include <linux/errqueue.h>
86
87 #ifdef CONFIG_INET
88 #include <net/inet_common.h>
89 #endif
90
91 /*
92 Assumptions:
93 - if device has no dev->hard_header routine, it adds and removes ll header
94 inside itself. In this case ll header is invisible outside of device,
95 but higher levels still should reserve dev->hard_header_len.
96 Some devices are enough clever to reallocate skb, when header
97 will not fit to reserved space (tunnel), another ones are silly
98 (PPP).
99 - packet socket receives packets with pulled ll header,
100 so that SOCK_RAW should push it back.
101
102 On receive:
103 -----------
104
105 Incoming, dev->hard_header!=NULL
106 mac_header -> ll header
107 data -> data
108
109 Outgoing, dev->hard_header!=NULL
110 mac_header -> ll header
111 data -> ll header
112
113 Incoming, dev->hard_header==NULL
114 mac_header -> UNKNOWN position. It is very likely, that it points to ll
115 header. PPP makes it, that is wrong, because introduce
116 assymetry between rx and tx paths.
117 data -> data
118
119 Outgoing, dev->hard_header==NULL
120 mac_header -> data. ll header is still not built!
121 data -> data
122
123 Resume
124 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
125
126
127 On transmit:
128 ------------
129
130 dev->hard_header != NULL
131 mac_header -> ll header
132 data -> ll header
133
134 dev->hard_header == NULL (ll header is added by device, we cannot control it)
135 mac_header -> data
136 data -> data
137
138 We should set nh.raw on output to correct posistion,
139 packet classifier depends on it.
140 */
141
142 /* Private packet socket structures. */
143
144 struct packet_mclist {
145 struct packet_mclist *next;
146 int ifindex;
147 int count;
148 unsigned short type;
149 unsigned short alen;
150 unsigned char addr[MAX_ADDR_LEN];
151 };
152 /* identical to struct packet_mreq except it has
153 * a longer address field.
154 */
155 struct packet_mreq_max {
156 int mr_ifindex;
157 unsigned short mr_type;
158 unsigned short mr_alen;
159 unsigned char mr_address[MAX_ADDR_LEN];
160 };
161
162 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
163 int closing, int tx_ring);
164
165 struct packet_ring_buffer {
166 char **pg_vec;
167 unsigned int head;
168 unsigned int frames_per_block;
169 unsigned int frame_size;
170 unsigned int frame_max;
171
172 unsigned int pg_vec_order;
173 unsigned int pg_vec_pages;
174 unsigned int pg_vec_len;
175
176 atomic_t pending;
177 };
178
179 struct packet_sock;
180 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
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 struct packet_ring_buffer rx_ring;
189 struct packet_ring_buffer tx_ring;
190 int copy_thresh;
191 spinlock_t bind_lock;
192 struct mutex pg_vec_lock;
193 unsigned int running:1, /* prot_hook is attached*/
194 auxdata:1,
195 origdev:1,
196 has_vnet_hdr:1;
197 int ifindex; /* bound device */
198 __be16 num;
199 struct packet_mclist *mclist;
200 atomic_t mapped;
201 enum tpacket_versions tp_version;
202 unsigned int tp_hdrlen;
203 unsigned int tp_reserve;
204 unsigned int tp_loss:1;
205 struct packet_type prot_hook ____cacheline_aligned_in_smp;
206 };
207
208 struct packet_skb_cb {
209 unsigned int origlen;
210 union {
211 struct sockaddr_pkt pkt;
212 struct sockaddr_ll ll;
213 } sa;
214 };
215
216 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
217
218 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
219 {
220 union {
221 struct tpacket_hdr *h1;
222 struct tpacket2_hdr *h2;
223 void *raw;
224 } h;
225
226 h.raw = frame;
227 switch (po->tp_version) {
228 case TPACKET_V1:
229 h.h1->tp_status = status;
230 flush_dcache_page(virt_to_page(&h.h1->tp_status));
231 break;
232 case TPACKET_V2:
233 h.h2->tp_status = status;
234 flush_dcache_page(virt_to_page(&h.h2->tp_status));
235 break;
236 default:
237 pr_err("TPACKET version not supported\n");
238 BUG();
239 }
240
241 smp_wmb();
242 }
243
244 static int __packet_get_status(struct packet_sock *po, void *frame)
245 {
246 union {
247 struct tpacket_hdr *h1;
248 struct tpacket2_hdr *h2;
249 void *raw;
250 } h;
251
252 smp_rmb();
253
254 h.raw = frame;
255 switch (po->tp_version) {
256 case TPACKET_V1:
257 flush_dcache_page(virt_to_page(&h.h1->tp_status));
258 return h.h1->tp_status;
259 case TPACKET_V2:
260 flush_dcache_page(virt_to_page(&h.h2->tp_status));
261 return h.h2->tp_status;
262 default:
263 pr_err("TPACKET version not supported\n");
264 BUG();
265 return 0;
266 }
267 }
268
269 static void *packet_lookup_frame(struct packet_sock *po,
270 struct packet_ring_buffer *rb,
271 unsigned int position,
272 int status)
273 {
274 unsigned int pg_vec_pos, frame_offset;
275 union {
276 struct tpacket_hdr *h1;
277 struct tpacket2_hdr *h2;
278 void *raw;
279 } h;
280
281 pg_vec_pos = position / rb->frames_per_block;
282 frame_offset = position % rb->frames_per_block;
283
284 h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size);
285
286 if (status != __packet_get_status(po, h.raw))
287 return NULL;
288
289 return h.raw;
290 }
291
292 static inline void *packet_current_frame(struct packet_sock *po,
293 struct packet_ring_buffer *rb,
294 int status)
295 {
296 return packet_lookup_frame(po, rb, rb->head, status);
297 }
298
299 static inline void *packet_previous_frame(struct packet_sock *po,
300 struct packet_ring_buffer *rb,
301 int status)
302 {
303 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
304 return packet_lookup_frame(po, rb, previous, status);
305 }
306
307 static inline void packet_increment_head(struct packet_ring_buffer *buff)
308 {
309 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
310 }
311
312 static inline struct packet_sock *pkt_sk(struct sock *sk)
313 {
314 return (struct packet_sock *)sk;
315 }
316
317 static void packet_sock_destruct(struct sock *sk)
318 {
319 skb_queue_purge(&sk->sk_error_queue);
320
321 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
322 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
323
324 if (!sock_flag(sk, SOCK_DEAD)) {
325 pr_err("Attempt to release alive packet socket: %p\n", sk);
326 return;
327 }
328
329 sk_refcnt_debug_dec(sk);
330 }
331
332
333 static const struct proto_ops packet_ops;
334
335 static const struct proto_ops packet_ops_spkt;
336
337 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
338 struct packet_type *pt, struct net_device *orig_dev)
339 {
340 struct sock *sk;
341 struct sockaddr_pkt *spkt;
342
343 /*
344 * When we registered the protocol we saved the socket in the data
345 * field for just this event.
346 */
347
348 sk = pt->af_packet_priv;
349
350 /*
351 * Yank back the headers [hope the device set this
352 * right or kerboom...]
353 *
354 * Incoming packets have ll header pulled,
355 * push it back.
356 *
357 * For outgoing ones skb->data == skb_mac_header(skb)
358 * so that this procedure is noop.
359 */
360
361 if (skb->pkt_type == PACKET_LOOPBACK)
362 goto out;
363
364 if (!net_eq(dev_net(dev), sock_net(sk)))
365 goto out;
366
367 skb = skb_share_check(skb, GFP_ATOMIC);
368 if (skb == NULL)
369 goto oom;
370
371 /* drop any routing info */
372 skb_dst_drop(skb);
373
374 /* drop conntrack reference */
375 nf_reset(skb);
376
377 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
378
379 skb_push(skb, skb->data - skb_mac_header(skb));
380
381 /*
382 * The SOCK_PACKET socket receives _all_ frames.
383 */
384
385 spkt->spkt_family = dev->type;
386 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
387 spkt->spkt_protocol = skb->protocol;
388
389 /*
390 * Charge the memory to the socket. This is done specifically
391 * to prevent sockets using all the memory up.
392 */
393
394 if (sock_queue_rcv_skb(sk, skb) == 0)
395 return 0;
396
397 out:
398 kfree_skb(skb);
399 oom:
400 return 0;
401 }
402
403
404 /*
405 * Output a raw packet to a device layer. This bypasses all the other
406 * protocol layers and you must therefore supply it with a complete frame
407 */
408
409 static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
410 struct msghdr *msg, size_t len)
411 {
412 struct sock *sk = sock->sk;
413 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
414 struct sk_buff *skb = NULL;
415 struct net_device *dev;
416 __be16 proto = 0;
417 int err;
418
419 /*
420 * Get and verify the address.
421 */
422
423 if (saddr) {
424 if (msg->msg_namelen < sizeof(struct sockaddr))
425 return -EINVAL;
426 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
427 proto = saddr->spkt_protocol;
428 } else
429 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
430
431 /*
432 * Find the device first to size check it
433 */
434
435 saddr->spkt_device[13] = 0;
436 retry:
437 rcu_read_lock();
438 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
439 err = -ENODEV;
440 if (dev == NULL)
441 goto out_unlock;
442
443 err = -ENETDOWN;
444 if (!(dev->flags & IFF_UP))
445 goto out_unlock;
446
447 /*
448 * You may not queue a frame bigger than the mtu. This is the lowest level
449 * raw protocol and you must do your own fragmentation at this level.
450 */
451
452 err = -EMSGSIZE;
453 if (len > dev->mtu + dev->hard_header_len)
454 goto out_unlock;
455
456 if (!skb) {
457 size_t reserved = LL_RESERVED_SPACE(dev);
458 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
459
460 rcu_read_unlock();
461 skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL);
462 if (skb == NULL)
463 return -ENOBUFS;
464 /* FIXME: Save some space for broken drivers that write a hard
465 * header at transmission time by themselves. PPP is the notable
466 * one here. This should really be fixed at the driver level.
467 */
468 skb_reserve(skb, reserved);
469 skb_reset_network_header(skb);
470
471 /* Try to align data part correctly */
472 if (hhlen) {
473 skb->data -= hhlen;
474 skb->tail -= hhlen;
475 if (len < hhlen)
476 skb_reset_network_header(skb);
477 }
478 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
479 if (err)
480 goto out_free;
481 goto retry;
482 }
483
484
485 skb->protocol = proto;
486 skb->dev = dev;
487 skb->priority = sk->sk_priority;
488 skb->mark = sk->sk_mark;
489 err = sock_tx_timestamp(msg, sk, skb_tx(skb));
490 if (err < 0)
491 goto out_unlock;
492
493 dev_queue_xmit(skb);
494 rcu_read_unlock();
495 return len;
496
497 out_unlock:
498 rcu_read_unlock();
499 out_free:
500 kfree_skb(skb);
501 return err;
502 }
503
504 static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
505 unsigned int res)
506 {
507 struct sk_filter *filter;
508
509 rcu_read_lock_bh();
510 filter = rcu_dereference_bh(sk->sk_filter);
511 if (filter != NULL)
512 res = sk_run_filter(skb, filter->insns, filter->len);
513 rcu_read_unlock_bh();
514
515 return res;
516 }
517
518 /*
519 This function makes lazy skb cloning in hope that most of packets
520 are discarded by BPF.
521
522 Note tricky part: we DO mangle shared skb! skb->data, skb->len
523 and skb->cb are mangled. It works because (and until) packets
524 falling here are owned by current CPU. Output packets are cloned
525 by dev_queue_xmit_nit(), input packets are processed by net_bh
526 sequencially, so that if we return skb to original state on exit,
527 we will not harm anyone.
528 */
529
530 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
531 struct packet_type *pt, struct net_device *orig_dev)
532 {
533 struct sock *sk;
534 struct sockaddr_ll *sll;
535 struct packet_sock *po;
536 u8 *skb_head = skb->data;
537 int skb_len = skb->len;
538 unsigned int snaplen, res;
539
540 if (skb->pkt_type == PACKET_LOOPBACK)
541 goto drop;
542
543 sk = pt->af_packet_priv;
544 po = pkt_sk(sk);
545
546 if (!net_eq(dev_net(dev), sock_net(sk)))
547 goto drop;
548
549 skb->dev = dev;
550
551 if (dev->header_ops) {
552 /* The device has an explicit notion of ll header,
553 exported to higher levels.
554
555 Otherwise, the device hides datails of it frame
556 structure, so that corresponding packet head
557 never delivered to user.
558 */
559 if (sk->sk_type != SOCK_DGRAM)
560 skb_push(skb, skb->data - skb_mac_header(skb));
561 else if (skb->pkt_type == PACKET_OUTGOING) {
562 /* Special case: outgoing packets have ll header at head */
563 skb_pull(skb, skb_network_offset(skb));
564 }
565 }
566
567 snaplen = skb->len;
568
569 res = run_filter(skb, sk, snaplen);
570 if (!res)
571 goto drop_n_restore;
572 if (snaplen > res)
573 snaplen = res;
574
575 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
576 (unsigned)sk->sk_rcvbuf)
577 goto drop_n_acct;
578
579 if (skb_shared(skb)) {
580 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
581 if (nskb == NULL)
582 goto drop_n_acct;
583
584 if (skb_head != skb->data) {
585 skb->data = skb_head;
586 skb->len = skb_len;
587 }
588 kfree_skb(skb);
589 skb = nskb;
590 }
591
592 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
593 sizeof(skb->cb));
594
595 sll = &PACKET_SKB_CB(skb)->sa.ll;
596 sll->sll_family = AF_PACKET;
597 sll->sll_hatype = dev->type;
598 sll->sll_protocol = skb->protocol;
599 sll->sll_pkttype = skb->pkt_type;
600 if (unlikely(po->origdev))
601 sll->sll_ifindex = orig_dev->ifindex;
602 else
603 sll->sll_ifindex = dev->ifindex;
604
605 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
606
607 PACKET_SKB_CB(skb)->origlen = skb->len;
608
609 if (pskb_trim(skb, snaplen))
610 goto drop_n_acct;
611
612 skb_set_owner_r(skb, sk);
613 skb->dev = NULL;
614 skb_dst_drop(skb);
615
616 /* drop conntrack reference */
617 nf_reset(skb);
618
619 spin_lock(&sk->sk_receive_queue.lock);
620 po->stats.tp_packets++;
621 skb->dropcount = atomic_read(&sk->sk_drops);
622 __skb_queue_tail(&sk->sk_receive_queue, skb);
623 spin_unlock(&sk->sk_receive_queue.lock);
624 sk->sk_data_ready(sk, skb->len);
625 return 0;
626
627 drop_n_acct:
628 po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
629
630 drop_n_restore:
631 if (skb_head != skb->data && skb_shared(skb)) {
632 skb->data = skb_head;
633 skb->len = skb_len;
634 }
635 drop:
636 consume_skb(skb);
637 return 0;
638 }
639
640 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
641 struct packet_type *pt, struct net_device *orig_dev)
642 {
643 struct sock *sk;
644 struct packet_sock *po;
645 struct sockaddr_ll *sll;
646 union {
647 struct tpacket_hdr *h1;
648 struct tpacket2_hdr *h2;
649 void *raw;
650 } h;
651 u8 *skb_head = skb->data;
652 int skb_len = skb->len;
653 unsigned int snaplen, res;
654 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
655 unsigned short macoff, netoff, hdrlen;
656 struct sk_buff *copy_skb = NULL;
657 struct timeval tv;
658 struct timespec ts;
659
660 if (skb->pkt_type == PACKET_LOOPBACK)
661 goto drop;
662
663 sk = pt->af_packet_priv;
664 po = pkt_sk(sk);
665
666 if (!net_eq(dev_net(dev), sock_net(sk)))
667 goto drop;
668
669 if (dev->header_ops) {
670 if (sk->sk_type != SOCK_DGRAM)
671 skb_push(skb, skb->data - skb_mac_header(skb));
672 else if (skb->pkt_type == PACKET_OUTGOING) {
673 /* Special case: outgoing packets have ll header at head */
674 skb_pull(skb, skb_network_offset(skb));
675 }
676 }
677
678 if (skb->ip_summed == CHECKSUM_PARTIAL)
679 status |= TP_STATUS_CSUMNOTREADY;
680
681 snaplen = skb->len;
682
683 res = run_filter(skb, sk, snaplen);
684 if (!res)
685 goto drop_n_restore;
686 if (snaplen > res)
687 snaplen = res;
688
689 if (sk->sk_type == SOCK_DGRAM) {
690 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
691 po->tp_reserve;
692 } else {
693 unsigned maclen = skb_network_offset(skb);
694 netoff = TPACKET_ALIGN(po->tp_hdrlen +
695 (maclen < 16 ? 16 : maclen)) +
696 po->tp_reserve;
697 macoff = netoff - maclen;
698 }
699
700 if (macoff + snaplen > po->rx_ring.frame_size) {
701 if (po->copy_thresh &&
702 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
703 (unsigned)sk->sk_rcvbuf) {
704 if (skb_shared(skb)) {
705 copy_skb = skb_clone(skb, GFP_ATOMIC);
706 } else {
707 copy_skb = skb_get(skb);
708 skb_head = skb->data;
709 }
710 if (copy_skb)
711 skb_set_owner_r(copy_skb, sk);
712 }
713 snaplen = po->rx_ring.frame_size - macoff;
714 if ((int)snaplen < 0)
715 snaplen = 0;
716 }
717
718 spin_lock(&sk->sk_receive_queue.lock);
719 h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
720 if (!h.raw)
721 goto ring_is_full;
722 packet_increment_head(&po->rx_ring);
723 po->stats.tp_packets++;
724 if (copy_skb) {
725 status |= TP_STATUS_COPY;
726 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
727 }
728 if (!po->stats.tp_drops)
729 status &= ~TP_STATUS_LOSING;
730 spin_unlock(&sk->sk_receive_queue.lock);
731
732 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
733
734 switch (po->tp_version) {
735 case TPACKET_V1:
736 h.h1->tp_len = skb->len;
737 h.h1->tp_snaplen = snaplen;
738 h.h1->tp_mac = macoff;
739 h.h1->tp_net = netoff;
740 if (skb->tstamp.tv64)
741 tv = ktime_to_timeval(skb->tstamp);
742 else
743 do_gettimeofday(&tv);
744 h.h1->tp_sec = tv.tv_sec;
745 h.h1->tp_usec = tv.tv_usec;
746 hdrlen = sizeof(*h.h1);
747 break;
748 case TPACKET_V2:
749 h.h2->tp_len = skb->len;
750 h.h2->tp_snaplen = snaplen;
751 h.h2->tp_mac = macoff;
752 h.h2->tp_net = netoff;
753 if (skb->tstamp.tv64)
754 ts = ktime_to_timespec(skb->tstamp);
755 else
756 getnstimeofday(&ts);
757 h.h2->tp_sec = ts.tv_sec;
758 h.h2->tp_nsec = ts.tv_nsec;
759 h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
760 hdrlen = sizeof(*h.h2);
761 break;
762 default:
763 BUG();
764 }
765
766 sll = h.raw + TPACKET_ALIGN(hdrlen);
767 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
768 sll->sll_family = AF_PACKET;
769 sll->sll_hatype = dev->type;
770 sll->sll_protocol = skb->protocol;
771 sll->sll_pkttype = skb->pkt_type;
772 if (unlikely(po->origdev))
773 sll->sll_ifindex = orig_dev->ifindex;
774 else
775 sll->sll_ifindex = dev->ifindex;
776
777 __packet_set_status(po, h.raw, status);
778 smp_mb();
779 {
780 struct page *p_start, *p_end;
781 u8 *h_end = h.raw + macoff + snaplen - 1;
782
783 p_start = virt_to_page(h.raw);
784 p_end = virt_to_page(h_end);
785 while (p_start <= p_end) {
786 flush_dcache_page(p_start);
787 p_start++;
788 }
789 }
790
791 sk->sk_data_ready(sk, 0);
792
793 drop_n_restore:
794 if (skb_head != skb->data && skb_shared(skb)) {
795 skb->data = skb_head;
796 skb->len = skb_len;
797 }
798 drop:
799 kfree_skb(skb);
800 return 0;
801
802 ring_is_full:
803 po->stats.tp_drops++;
804 spin_unlock(&sk->sk_receive_queue.lock);
805
806 sk->sk_data_ready(sk, 0);
807 kfree_skb(copy_skb);
808 goto drop_n_restore;
809 }
810
811 static void tpacket_destruct_skb(struct sk_buff *skb)
812 {
813 struct packet_sock *po = pkt_sk(skb->sk);
814 void *ph;
815
816 BUG_ON(skb == NULL);
817
818 if (likely(po->tx_ring.pg_vec)) {
819 ph = skb_shinfo(skb)->destructor_arg;
820 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
821 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
822 atomic_dec(&po->tx_ring.pending);
823 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
824 }
825
826 sock_wfree(skb);
827 }
828
829 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
830 void *frame, struct net_device *dev, int size_max,
831 __be16 proto, unsigned char *addr)
832 {
833 union {
834 struct tpacket_hdr *h1;
835 struct tpacket2_hdr *h2;
836 void *raw;
837 } ph;
838 int to_write, offset, len, tp_len, nr_frags, len_max;
839 struct socket *sock = po->sk.sk_socket;
840 struct page *page;
841 void *data;
842 int err;
843
844 ph.raw = frame;
845
846 skb->protocol = proto;
847 skb->dev = dev;
848 skb->priority = po->sk.sk_priority;
849 skb->mark = po->sk.sk_mark;
850 skb_shinfo(skb)->destructor_arg = ph.raw;
851
852 switch (po->tp_version) {
853 case TPACKET_V2:
854 tp_len = ph.h2->tp_len;
855 break;
856 default:
857 tp_len = ph.h1->tp_len;
858 break;
859 }
860 if (unlikely(tp_len > size_max)) {
861 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
862 return -EMSGSIZE;
863 }
864
865 skb_reserve(skb, LL_RESERVED_SPACE(dev));
866 skb_reset_network_header(skb);
867
868 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
869 to_write = tp_len;
870
871 if (sock->type == SOCK_DGRAM) {
872 err = dev_hard_header(skb, dev, ntohs(proto), addr,
873 NULL, tp_len);
874 if (unlikely(err < 0))
875 return -EINVAL;
876 } else if (dev->hard_header_len) {
877 /* net device doesn't like empty head */
878 if (unlikely(tp_len <= dev->hard_header_len)) {
879 pr_err("packet size is too short (%d < %d)\n",
880 tp_len, dev->hard_header_len);
881 return -EINVAL;
882 }
883
884 skb_push(skb, dev->hard_header_len);
885 err = skb_store_bits(skb, 0, data,
886 dev->hard_header_len);
887 if (unlikely(err))
888 return err;
889
890 data += dev->hard_header_len;
891 to_write -= dev->hard_header_len;
892 }
893
894 err = -EFAULT;
895 page = virt_to_page(data);
896 offset = offset_in_page(data);
897 len_max = PAGE_SIZE - offset;
898 len = ((to_write > len_max) ? len_max : to_write);
899
900 skb->data_len = to_write;
901 skb->len += to_write;
902 skb->truesize += to_write;
903 atomic_add(to_write, &po->sk.sk_wmem_alloc);
904
905 while (likely(to_write)) {
906 nr_frags = skb_shinfo(skb)->nr_frags;
907
908 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
909 pr_err("Packet exceed the number of skb frags(%lu)\n",
910 MAX_SKB_FRAGS);
911 return -EFAULT;
912 }
913
914 flush_dcache_page(page);
915 get_page(page);
916 skb_fill_page_desc(skb,
917 nr_frags,
918 page++, offset, len);
919 to_write -= len;
920 offset = 0;
921 len_max = PAGE_SIZE;
922 len = ((to_write > len_max) ? len_max : to_write);
923 }
924
925 return tp_len;
926 }
927
928 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
929 {
930 struct socket *sock;
931 struct sk_buff *skb;
932 struct net_device *dev;
933 __be16 proto;
934 int ifindex, err, reserve = 0;
935 void *ph;
936 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
937 int tp_len, size_max;
938 unsigned char *addr;
939 int len_sum = 0;
940 int status = 0;
941
942 sock = po->sk.sk_socket;
943
944 mutex_lock(&po->pg_vec_lock);
945
946 err = -EBUSY;
947 if (saddr == NULL) {
948 ifindex = po->ifindex;
949 proto = po->num;
950 addr = NULL;
951 } else {
952 err = -EINVAL;
953 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
954 goto out;
955 if (msg->msg_namelen < (saddr->sll_halen
956 + offsetof(struct sockaddr_ll,
957 sll_addr)))
958 goto out;
959 ifindex = saddr->sll_ifindex;
960 proto = saddr->sll_protocol;
961 addr = saddr->sll_addr;
962 }
963
964 dev = dev_get_by_index(sock_net(&po->sk), ifindex);
965 err = -ENXIO;
966 if (unlikely(dev == NULL))
967 goto out;
968
969 reserve = dev->hard_header_len;
970
971 err = -ENETDOWN;
972 if (unlikely(!(dev->flags & IFF_UP)))
973 goto out_put;
974
975 size_max = po->tx_ring.frame_size
976 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
977
978 if (size_max > dev->mtu + reserve)
979 size_max = dev->mtu + reserve;
980
981 do {
982 ph = packet_current_frame(po, &po->tx_ring,
983 TP_STATUS_SEND_REQUEST);
984
985 if (unlikely(ph == NULL)) {
986 schedule();
987 continue;
988 }
989
990 status = TP_STATUS_SEND_REQUEST;
991 skb = sock_alloc_send_skb(&po->sk,
992 LL_ALLOCATED_SPACE(dev)
993 + sizeof(struct sockaddr_ll),
994 0, &err);
995
996 if (unlikely(skb == NULL))
997 goto out_status;
998
999 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1000 addr);
1001
1002 if (unlikely(tp_len < 0)) {
1003 if (po->tp_loss) {
1004 __packet_set_status(po, ph,
1005 TP_STATUS_AVAILABLE);
1006 packet_increment_head(&po->tx_ring);
1007 kfree_skb(skb);
1008 continue;
1009 } else {
1010 status = TP_STATUS_WRONG_FORMAT;
1011 err = tp_len;
1012 goto out_status;
1013 }
1014 }
1015
1016 skb->destructor = tpacket_destruct_skb;
1017 __packet_set_status(po, ph, TP_STATUS_SENDING);
1018 atomic_inc(&po->tx_ring.pending);
1019
1020 status = TP_STATUS_SEND_REQUEST;
1021 err = dev_queue_xmit(skb);
1022 if (unlikely(err > 0)) {
1023 err = net_xmit_errno(err);
1024 if (err && __packet_get_status(po, ph) ==
1025 TP_STATUS_AVAILABLE) {
1026 /* skb was destructed already */
1027 skb = NULL;
1028 goto out_status;
1029 }
1030 /*
1031 * skb was dropped but not destructed yet;
1032 * let's treat it like congestion or err < 0
1033 */
1034 err = 0;
1035 }
1036 packet_increment_head(&po->tx_ring);
1037 len_sum += tp_len;
1038 } while (likely((ph != NULL) ||
1039 ((!(msg->msg_flags & MSG_DONTWAIT)) &&
1040 (atomic_read(&po->tx_ring.pending))))
1041 );
1042
1043 err = len_sum;
1044 goto out_put;
1045
1046 out_status:
1047 __packet_set_status(po, ph, status);
1048 kfree_skb(skb);
1049 out_put:
1050 dev_put(dev);
1051 out:
1052 mutex_unlock(&po->pg_vec_lock);
1053 return err;
1054 }
1055
1056 static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
1057 size_t reserve, size_t len,
1058 size_t linear, int noblock,
1059 int *err)
1060 {
1061 struct sk_buff *skb;
1062
1063 /* Under a page? Don't bother with paged skb. */
1064 if (prepad + len < PAGE_SIZE || !linear)
1065 linear = len;
1066
1067 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
1068 err);
1069 if (!skb)
1070 return NULL;
1071
1072 skb_reserve(skb, reserve);
1073 skb_put(skb, linear);
1074 skb->data_len = len - linear;
1075 skb->len += len - linear;
1076
1077 return skb;
1078 }
1079
1080 static int packet_snd(struct socket *sock,
1081 struct msghdr *msg, size_t len)
1082 {
1083 struct sock *sk = sock->sk;
1084 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1085 struct sk_buff *skb;
1086 struct net_device *dev;
1087 __be16 proto;
1088 unsigned char *addr;
1089 int ifindex, err, reserve = 0;
1090 struct virtio_net_hdr vnet_hdr = { 0 };
1091 int offset = 0;
1092 int vnet_hdr_len;
1093 struct packet_sock *po = pkt_sk(sk);
1094 unsigned short gso_type = 0;
1095
1096 /*
1097 * Get and verify the address.
1098 */
1099
1100 if (saddr == NULL) {
1101 ifindex = po->ifindex;
1102 proto = po->num;
1103 addr = NULL;
1104 } else {
1105 err = -EINVAL;
1106 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1107 goto out;
1108 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1109 goto out;
1110 ifindex = saddr->sll_ifindex;
1111 proto = saddr->sll_protocol;
1112 addr = saddr->sll_addr;
1113 }
1114
1115
1116 dev = dev_get_by_index(sock_net(sk), ifindex);
1117 err = -ENXIO;
1118 if (dev == NULL)
1119 goto out_unlock;
1120 if (sock->type == SOCK_RAW)
1121 reserve = dev->hard_header_len;
1122
1123 err = -ENETDOWN;
1124 if (!(dev->flags & IFF_UP))
1125 goto out_unlock;
1126
1127 if (po->has_vnet_hdr) {
1128 vnet_hdr_len = sizeof(vnet_hdr);
1129
1130 err = -EINVAL;
1131 if (len < vnet_hdr_len)
1132 goto out_unlock;
1133
1134 len -= vnet_hdr_len;
1135
1136 err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
1137 vnet_hdr_len);
1138 if (err < 0)
1139 goto out_unlock;
1140
1141 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
1142 (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
1143 vnet_hdr.hdr_len))
1144 vnet_hdr.hdr_len = vnet_hdr.csum_start +
1145 vnet_hdr.csum_offset + 2;
1146
1147 err = -EINVAL;
1148 if (vnet_hdr.hdr_len > len)
1149 goto out_unlock;
1150
1151 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1152 switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1153 case VIRTIO_NET_HDR_GSO_TCPV4:
1154 gso_type = SKB_GSO_TCPV4;
1155 break;
1156 case VIRTIO_NET_HDR_GSO_TCPV6:
1157 gso_type = SKB_GSO_TCPV6;
1158 break;
1159 case VIRTIO_NET_HDR_GSO_UDP:
1160 gso_type = SKB_GSO_UDP;
1161 break;
1162 default:
1163 goto out_unlock;
1164 }
1165
1166 if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
1167 gso_type |= SKB_GSO_TCP_ECN;
1168
1169 if (vnet_hdr.gso_size == 0)
1170 goto out_unlock;
1171
1172 }
1173 }
1174
1175 err = -EMSGSIZE;
1176 if (!gso_type && (len > dev->mtu+reserve))
1177 goto out_unlock;
1178
1179 err = -ENOBUFS;
1180 skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
1181 LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
1182 msg->msg_flags & MSG_DONTWAIT, &err);
1183 if (skb == NULL)
1184 goto out_unlock;
1185
1186 skb_set_network_header(skb, reserve);
1187
1188 err = -EINVAL;
1189 if (sock->type == SOCK_DGRAM &&
1190 (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
1191 goto out_free;
1192
1193 /* Returns -EFAULT on error */
1194 err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
1195 if (err)
1196 goto out_free;
1197 err = sock_tx_timestamp(msg, sk, skb_tx(skb));
1198 if (err < 0)
1199 goto out_free;
1200
1201 skb->protocol = proto;
1202 skb->dev = dev;
1203 skb->priority = sk->sk_priority;
1204 skb->mark = sk->sk_mark;
1205
1206 if (po->has_vnet_hdr) {
1207 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1208 if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
1209 vnet_hdr.csum_offset)) {
1210 err = -EINVAL;
1211 goto out_free;
1212 }
1213 }
1214
1215 skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
1216 skb_shinfo(skb)->gso_type = gso_type;
1217
1218 /* Header must be checked, and gso_segs computed. */
1219 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
1220 skb_shinfo(skb)->gso_segs = 0;
1221
1222 len += vnet_hdr_len;
1223 }
1224
1225 /*
1226 * Now send it
1227 */
1228
1229 err = dev_queue_xmit(skb);
1230 if (err > 0 && (err = net_xmit_errno(err)) != 0)
1231 goto out_unlock;
1232
1233 dev_put(dev);
1234
1235 return len;
1236
1237 out_free:
1238 kfree_skb(skb);
1239 out_unlock:
1240 if (dev)
1241 dev_put(dev);
1242 out:
1243 return err;
1244 }
1245
1246 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1247 struct msghdr *msg, size_t len)
1248 {
1249 struct sock *sk = sock->sk;
1250 struct packet_sock *po = pkt_sk(sk);
1251 if (po->tx_ring.pg_vec)
1252 return tpacket_snd(po, msg);
1253 else
1254 return packet_snd(sock, msg, len);
1255 }
1256
1257 /*
1258 * Close a PACKET socket. This is fairly simple. We immediately go
1259 * to 'closed' state and remove our protocol entry in the device list.
1260 */
1261
1262 static int packet_release(struct socket *sock)
1263 {
1264 struct sock *sk = sock->sk;
1265 struct packet_sock *po;
1266 struct net *net;
1267 struct tpacket_req req;
1268
1269 if (!sk)
1270 return 0;
1271
1272 net = sock_net(sk);
1273 po = pkt_sk(sk);
1274
1275 spin_lock_bh(&net->packet.sklist_lock);
1276 sk_del_node_init_rcu(sk);
1277 sock_prot_inuse_add(net, sk->sk_prot, -1);
1278 spin_unlock_bh(&net->packet.sklist_lock);
1279
1280 spin_lock(&po->bind_lock);
1281 if (po->running) {
1282 /*
1283 * Remove from protocol table
1284 */
1285 po->running = 0;
1286 po->num = 0;
1287 __dev_remove_pack(&po->prot_hook);
1288 __sock_put(sk);
1289 }
1290 spin_unlock(&po->bind_lock);
1291
1292 packet_flush_mclist(sk);
1293
1294 memset(&req, 0, sizeof(req));
1295
1296 if (po->rx_ring.pg_vec)
1297 packet_set_ring(sk, &req, 1, 0);
1298
1299 if (po->tx_ring.pg_vec)
1300 packet_set_ring(sk, &req, 1, 1);
1301
1302 synchronize_net();
1303 /*
1304 * Now the socket is dead. No more input will appear.
1305 */
1306 sock_orphan(sk);
1307 sock->sk = NULL;
1308
1309 /* Purge queues */
1310
1311 skb_queue_purge(&sk->sk_receive_queue);
1312 sk_refcnt_debug_release(sk);
1313
1314 sock_put(sk);
1315 return 0;
1316 }
1317
1318 /*
1319 * Attach a packet hook.
1320 */
1321
1322 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1323 {
1324 struct packet_sock *po = pkt_sk(sk);
1325 /*
1326 * Detach an existing hook if present.
1327 */
1328
1329 lock_sock(sk);
1330
1331 spin_lock(&po->bind_lock);
1332 if (po->running) {
1333 __sock_put(sk);
1334 po->running = 0;
1335 po->num = 0;
1336 spin_unlock(&po->bind_lock);
1337 dev_remove_pack(&po->prot_hook);
1338 spin_lock(&po->bind_lock);
1339 }
1340
1341 po->num = protocol;
1342 po->prot_hook.type = protocol;
1343 po->prot_hook.dev = dev;
1344
1345 po->ifindex = dev ? dev->ifindex : 0;
1346
1347 if (protocol == 0)
1348 goto out_unlock;
1349
1350 if (!dev || (dev->flags & IFF_UP)) {
1351 dev_add_pack(&po->prot_hook);
1352 sock_hold(sk);
1353 po->running = 1;
1354 } else {
1355 sk->sk_err = ENETDOWN;
1356 if (!sock_flag(sk, SOCK_DEAD))
1357 sk->sk_error_report(sk);
1358 }
1359
1360 out_unlock:
1361 spin_unlock(&po->bind_lock);
1362 release_sock(sk);
1363 return 0;
1364 }
1365
1366 /*
1367 * Bind a packet socket to a device
1368 */
1369
1370 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
1371 int addr_len)
1372 {
1373 struct sock *sk = sock->sk;
1374 char name[15];
1375 struct net_device *dev;
1376 int err = -ENODEV;
1377
1378 /*
1379 * Check legality
1380 */
1381
1382 if (addr_len != sizeof(struct sockaddr))
1383 return -EINVAL;
1384 strlcpy(name, uaddr->sa_data, sizeof(name));
1385
1386 dev = dev_get_by_name(sock_net(sk), name);
1387 if (dev) {
1388 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1389 dev_put(dev);
1390 }
1391 return err;
1392 }
1393
1394 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1395 {
1396 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1397 struct sock *sk = sock->sk;
1398 struct net_device *dev = NULL;
1399 int err;
1400
1401
1402 /*
1403 * Check legality
1404 */
1405
1406 if (addr_len < sizeof(struct sockaddr_ll))
1407 return -EINVAL;
1408 if (sll->sll_family != AF_PACKET)
1409 return -EINVAL;
1410
1411 if (sll->sll_ifindex) {
1412 err = -ENODEV;
1413 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1414 if (dev == NULL)
1415 goto out;
1416 }
1417 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1418 if (dev)
1419 dev_put(dev);
1420
1421 out:
1422 return err;
1423 }
1424
1425 static struct proto packet_proto = {
1426 .name = "PACKET",
1427 .owner = THIS_MODULE,
1428 .obj_size = sizeof(struct packet_sock),
1429 };
1430
1431 /*
1432 * Create a packet of type SOCK_PACKET.
1433 */
1434
1435 static int packet_create(struct net *net, struct socket *sock, int protocol,
1436 int kern)
1437 {
1438 struct sock *sk;
1439 struct packet_sock *po;
1440 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1441 int err;
1442
1443 if (!capable(CAP_NET_RAW))
1444 return -EPERM;
1445 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1446 sock->type != SOCK_PACKET)
1447 return -ESOCKTNOSUPPORT;
1448
1449 sock->state = SS_UNCONNECTED;
1450
1451 err = -ENOBUFS;
1452 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1453 if (sk == NULL)
1454 goto out;
1455
1456 sock->ops = &packet_ops;
1457 if (sock->type == SOCK_PACKET)
1458 sock->ops = &packet_ops_spkt;
1459
1460 sock_init_data(sock, sk);
1461
1462 po = pkt_sk(sk);
1463 sk->sk_family = PF_PACKET;
1464 po->num = proto;
1465
1466 sk->sk_destruct = packet_sock_destruct;
1467 sk_refcnt_debug_inc(sk);
1468
1469 /*
1470 * Attach a protocol block
1471 */
1472
1473 spin_lock_init(&po->bind_lock);
1474 mutex_init(&po->pg_vec_lock);
1475 po->prot_hook.func = packet_rcv;
1476
1477 if (sock->type == SOCK_PACKET)
1478 po->prot_hook.func = packet_rcv_spkt;
1479
1480 po->prot_hook.af_packet_priv = sk;
1481
1482 if (proto) {
1483 po->prot_hook.type = proto;
1484 dev_add_pack(&po->prot_hook);
1485 sock_hold(sk);
1486 po->running = 1;
1487 }
1488
1489 spin_lock_bh(&net->packet.sklist_lock);
1490 sk_add_node_rcu(sk, &net->packet.sklist);
1491 sock_prot_inuse_add(net, &packet_proto, 1);
1492 spin_unlock_bh(&net->packet.sklist_lock);
1493
1494 return 0;
1495 out:
1496 return err;
1497 }
1498
1499 static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
1500 {
1501 struct sock_exterr_skb *serr;
1502 struct sk_buff *skb, *skb2;
1503 int copied, err;
1504
1505 err = -EAGAIN;
1506 skb = skb_dequeue(&sk->sk_error_queue);
1507 if (skb == NULL)
1508 goto out;
1509
1510 copied = skb->len;
1511 if (copied > len) {
1512 msg->msg_flags |= MSG_TRUNC;
1513 copied = len;
1514 }
1515 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1516 if (err)
1517 goto out_free_skb;
1518
1519 sock_recv_timestamp(msg, sk, skb);
1520
1521 serr = SKB_EXT_ERR(skb);
1522 put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
1523 sizeof(serr->ee), &serr->ee);
1524
1525 msg->msg_flags |= MSG_ERRQUEUE;
1526 err = copied;
1527
1528 /* Reset and regenerate socket error */
1529 spin_lock_bh(&sk->sk_error_queue.lock);
1530 sk->sk_err = 0;
1531 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
1532 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
1533 spin_unlock_bh(&sk->sk_error_queue.lock);
1534 sk->sk_error_report(sk);
1535 } else
1536 spin_unlock_bh(&sk->sk_error_queue.lock);
1537
1538 out_free_skb:
1539 kfree_skb(skb);
1540 out:
1541 return err;
1542 }
1543
1544 /*
1545 * Pull a packet from our receive queue and hand it to the user.
1546 * If necessary we block.
1547 */
1548
1549 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1550 struct msghdr *msg, size_t len, int flags)
1551 {
1552 struct sock *sk = sock->sk;
1553 struct sk_buff *skb;
1554 int copied, err;
1555 struct sockaddr_ll *sll;
1556 int vnet_hdr_len = 0;
1557
1558 err = -EINVAL;
1559 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
1560 goto out;
1561
1562 #if 0
1563 /* What error should we return now? EUNATTACH? */
1564 if (pkt_sk(sk)->ifindex < 0)
1565 return -ENODEV;
1566 #endif
1567
1568 if (flags & MSG_ERRQUEUE) {
1569 err = packet_recv_error(sk, msg, len);
1570 goto out;
1571 }
1572
1573 /*
1574 * Call the generic datagram receiver. This handles all sorts
1575 * of horrible races and re-entrancy so we can forget about it
1576 * in the protocol layers.
1577 *
1578 * Now it will return ENETDOWN, if device have just gone down,
1579 * but then it will block.
1580 */
1581
1582 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1583
1584 /*
1585 * An error occurred so return it. Because skb_recv_datagram()
1586 * handles the blocking we don't see and worry about blocking
1587 * retries.
1588 */
1589
1590 if (skb == NULL)
1591 goto out;
1592
1593 if (pkt_sk(sk)->has_vnet_hdr) {
1594 struct virtio_net_hdr vnet_hdr = { 0 };
1595
1596 err = -EINVAL;
1597 vnet_hdr_len = sizeof(vnet_hdr);
1598 if ((len -= vnet_hdr_len) < 0)
1599 goto out_free;
1600
1601 if (skb_is_gso(skb)) {
1602 struct skb_shared_info *sinfo = skb_shinfo(skb);
1603
1604 /* This is a hint as to how much should be linear. */
1605 vnet_hdr.hdr_len = skb_headlen(skb);
1606 vnet_hdr.gso_size = sinfo->gso_size;
1607 if (sinfo->gso_type & SKB_GSO_TCPV4)
1608 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
1609 else if (sinfo->gso_type & SKB_GSO_TCPV6)
1610 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
1611 else if (sinfo->gso_type & SKB_GSO_UDP)
1612 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
1613 else if (sinfo->gso_type & SKB_GSO_FCOE)
1614 goto out_free;
1615 else
1616 BUG();
1617 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
1618 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
1619 } else
1620 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
1621
1622 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1623 vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
1624 vnet_hdr.csum_start = skb->csum_start -
1625 skb_headroom(skb);
1626 vnet_hdr.csum_offset = skb->csum_offset;
1627 } /* else everything is zero */
1628
1629 err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
1630 vnet_hdr_len);
1631 if (err < 0)
1632 goto out_free;
1633 }
1634
1635 /*
1636 * If the address length field is there to be filled in, we fill
1637 * it in now.
1638 */
1639
1640 sll = &PACKET_SKB_CB(skb)->sa.ll;
1641 if (sock->type == SOCK_PACKET)
1642 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1643 else
1644 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1645
1646 /*
1647 * You lose any data beyond the buffer you gave. If it worries a
1648 * user program they can ask the device for its MTU anyway.
1649 */
1650
1651 copied = skb->len;
1652 if (copied > len) {
1653 copied = len;
1654 msg->msg_flags |= MSG_TRUNC;
1655 }
1656
1657 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1658 if (err)
1659 goto out_free;
1660
1661 sock_recv_ts_and_drops(msg, sk, skb);
1662
1663 if (msg->msg_name)
1664 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1665 msg->msg_namelen);
1666
1667 if (pkt_sk(sk)->auxdata) {
1668 struct tpacket_auxdata aux;
1669
1670 aux.tp_status = TP_STATUS_USER;
1671 if (skb->ip_summed == CHECKSUM_PARTIAL)
1672 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1673 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1674 aux.tp_snaplen = skb->len;
1675 aux.tp_mac = 0;
1676 aux.tp_net = skb_network_offset(skb);
1677 aux.tp_vlan_tci = vlan_tx_tag_get(skb);
1678
1679 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1680 }
1681
1682 /*
1683 * Free or return the buffer as appropriate. Again this
1684 * hides all the races and re-entrancy issues from us.
1685 */
1686 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
1687
1688 out_free:
1689 skb_free_datagram(sk, skb);
1690 out:
1691 return err;
1692 }
1693
1694 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1695 int *uaddr_len, int peer)
1696 {
1697 struct net_device *dev;
1698 struct sock *sk = sock->sk;
1699
1700 if (peer)
1701 return -EOPNOTSUPP;
1702
1703 uaddr->sa_family = AF_PACKET;
1704 rcu_read_lock();
1705 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
1706 if (dev)
1707 strlcpy(uaddr->sa_data, dev->name, 15);
1708 else
1709 memset(uaddr->sa_data, 0, 14);
1710 rcu_read_unlock();
1711 *uaddr_len = sizeof(*uaddr);
1712
1713 return 0;
1714 }
1715
1716 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1717 int *uaddr_len, int peer)
1718 {
1719 struct net_device *dev;
1720 struct sock *sk = sock->sk;
1721 struct packet_sock *po = pkt_sk(sk);
1722 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
1723
1724 if (peer)
1725 return -EOPNOTSUPP;
1726
1727 sll->sll_family = AF_PACKET;
1728 sll->sll_ifindex = po->ifindex;
1729 sll->sll_protocol = po->num;
1730 rcu_read_lock();
1731 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
1732 if (dev) {
1733 sll->sll_hatype = dev->type;
1734 sll->sll_halen = dev->addr_len;
1735 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1736 } else {
1737 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1738 sll->sll_halen = 0;
1739 }
1740 rcu_read_unlock();
1741 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1742
1743 return 0;
1744 }
1745
1746 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1747 int what)
1748 {
1749 switch (i->type) {
1750 case PACKET_MR_MULTICAST:
1751 if (i->alen != dev->addr_len)
1752 return -EINVAL;
1753 if (what > 0)
1754 return dev_mc_add(dev, i->addr);
1755 else
1756 return dev_mc_del(dev, i->addr);
1757 break;
1758 case PACKET_MR_PROMISC:
1759 return dev_set_promiscuity(dev, what);
1760 break;
1761 case PACKET_MR_ALLMULTI:
1762 return dev_set_allmulti(dev, what);
1763 break;
1764 case PACKET_MR_UNICAST:
1765 if (i->alen != dev->addr_len)
1766 return -EINVAL;
1767 if (what > 0)
1768 return dev_uc_add(dev, i->addr);
1769 else
1770 return dev_uc_del(dev, i->addr);
1771 break;
1772 default:
1773 break;
1774 }
1775 return 0;
1776 }
1777
1778 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1779 {
1780 for ( ; i; i = i->next) {
1781 if (i->ifindex == dev->ifindex)
1782 packet_dev_mc(dev, i, what);
1783 }
1784 }
1785
1786 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1787 {
1788 struct packet_sock *po = pkt_sk(sk);
1789 struct packet_mclist *ml, *i;
1790 struct net_device *dev;
1791 int err;
1792
1793 rtnl_lock();
1794
1795 err = -ENODEV;
1796 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1797 if (!dev)
1798 goto done;
1799
1800 err = -EINVAL;
1801 if (mreq->mr_alen > dev->addr_len)
1802 goto done;
1803
1804 err = -ENOBUFS;
1805 i = kmalloc(sizeof(*i), GFP_KERNEL);
1806 if (i == NULL)
1807 goto done;
1808
1809 err = 0;
1810 for (ml = po->mclist; ml; ml = ml->next) {
1811 if (ml->ifindex == mreq->mr_ifindex &&
1812 ml->type == mreq->mr_type &&
1813 ml->alen == mreq->mr_alen &&
1814 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1815 ml->count++;
1816 /* Free the new element ... */
1817 kfree(i);
1818 goto done;
1819 }
1820 }
1821
1822 i->type = mreq->mr_type;
1823 i->ifindex = mreq->mr_ifindex;
1824 i->alen = mreq->mr_alen;
1825 memcpy(i->addr, mreq->mr_address, i->alen);
1826 i->count = 1;
1827 i->next = po->mclist;
1828 po->mclist = i;
1829 err = packet_dev_mc(dev, i, 1);
1830 if (err) {
1831 po->mclist = i->next;
1832 kfree(i);
1833 }
1834
1835 done:
1836 rtnl_unlock();
1837 return err;
1838 }
1839
1840 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1841 {
1842 struct packet_mclist *ml, **mlp;
1843
1844 rtnl_lock();
1845
1846 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1847 if (ml->ifindex == mreq->mr_ifindex &&
1848 ml->type == mreq->mr_type &&
1849 ml->alen == mreq->mr_alen &&
1850 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1851 if (--ml->count == 0) {
1852 struct net_device *dev;
1853 *mlp = ml->next;
1854 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1855 if (dev)
1856 packet_dev_mc(dev, ml, -1);
1857 kfree(ml);
1858 }
1859 rtnl_unlock();
1860 return 0;
1861 }
1862 }
1863 rtnl_unlock();
1864 return -EADDRNOTAVAIL;
1865 }
1866
1867 static void packet_flush_mclist(struct sock *sk)
1868 {
1869 struct packet_sock *po = pkt_sk(sk);
1870 struct packet_mclist *ml;
1871
1872 if (!po->mclist)
1873 return;
1874
1875 rtnl_lock();
1876 while ((ml = po->mclist) != NULL) {
1877 struct net_device *dev;
1878
1879 po->mclist = ml->next;
1880 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1881 if (dev != NULL)
1882 packet_dev_mc(dev, ml, -1);
1883 kfree(ml);
1884 }
1885 rtnl_unlock();
1886 }
1887
1888 static int
1889 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1890 {
1891 struct sock *sk = sock->sk;
1892 struct packet_sock *po = pkt_sk(sk);
1893 int ret;
1894
1895 if (level != SOL_PACKET)
1896 return -ENOPROTOOPT;
1897
1898 switch (optname) {
1899 case PACKET_ADD_MEMBERSHIP:
1900 case PACKET_DROP_MEMBERSHIP:
1901 {
1902 struct packet_mreq_max mreq;
1903 int len = optlen;
1904 memset(&mreq, 0, sizeof(mreq));
1905 if (len < sizeof(struct packet_mreq))
1906 return -EINVAL;
1907 if (len > sizeof(mreq))
1908 len = sizeof(mreq);
1909 if (copy_from_user(&mreq, optval, len))
1910 return -EFAULT;
1911 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1912 return -EINVAL;
1913 if (optname == PACKET_ADD_MEMBERSHIP)
1914 ret = packet_mc_add(sk, &mreq);
1915 else
1916 ret = packet_mc_drop(sk, &mreq);
1917 return ret;
1918 }
1919
1920 case PACKET_RX_RING:
1921 case PACKET_TX_RING:
1922 {
1923 struct tpacket_req req;
1924
1925 if (optlen < sizeof(req))
1926 return -EINVAL;
1927 if (pkt_sk(sk)->has_vnet_hdr)
1928 return -EINVAL;
1929 if (copy_from_user(&req, optval, sizeof(req)))
1930 return -EFAULT;
1931 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
1932 }
1933 case PACKET_COPY_THRESH:
1934 {
1935 int val;
1936
1937 if (optlen != sizeof(val))
1938 return -EINVAL;
1939 if (copy_from_user(&val, optval, sizeof(val)))
1940 return -EFAULT;
1941
1942 pkt_sk(sk)->copy_thresh = val;
1943 return 0;
1944 }
1945 case PACKET_VERSION:
1946 {
1947 int val;
1948
1949 if (optlen != sizeof(val))
1950 return -EINVAL;
1951 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1952 return -EBUSY;
1953 if (copy_from_user(&val, optval, sizeof(val)))
1954 return -EFAULT;
1955 switch (val) {
1956 case TPACKET_V1:
1957 case TPACKET_V2:
1958 po->tp_version = val;
1959 return 0;
1960 default:
1961 return -EINVAL;
1962 }
1963 }
1964 case PACKET_RESERVE:
1965 {
1966 unsigned int val;
1967
1968 if (optlen != sizeof(val))
1969 return -EINVAL;
1970 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1971 return -EBUSY;
1972 if (copy_from_user(&val, optval, sizeof(val)))
1973 return -EFAULT;
1974 po->tp_reserve = val;
1975 return 0;
1976 }
1977 case PACKET_LOSS:
1978 {
1979 unsigned int val;
1980
1981 if (optlen != sizeof(val))
1982 return -EINVAL;
1983 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1984 return -EBUSY;
1985 if (copy_from_user(&val, optval, sizeof(val)))
1986 return -EFAULT;
1987 po->tp_loss = !!val;
1988 return 0;
1989 }
1990 case PACKET_AUXDATA:
1991 {
1992 int val;
1993
1994 if (optlen < sizeof(val))
1995 return -EINVAL;
1996 if (copy_from_user(&val, optval, sizeof(val)))
1997 return -EFAULT;
1998
1999 po->auxdata = !!val;
2000 return 0;
2001 }
2002 case PACKET_ORIGDEV:
2003 {
2004 int val;
2005
2006 if (optlen < sizeof(val))
2007 return -EINVAL;
2008 if (copy_from_user(&val, optval, sizeof(val)))
2009 return -EFAULT;
2010
2011 po->origdev = !!val;
2012 return 0;
2013 }
2014 case PACKET_VNET_HDR:
2015 {
2016 int val;
2017
2018 if (sock->type != SOCK_RAW)
2019 return -EINVAL;
2020 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2021 return -EBUSY;
2022 if (optlen < sizeof(val))
2023 return -EINVAL;
2024 if (copy_from_user(&val, optval, sizeof(val)))
2025 return -EFAULT;
2026
2027 po->has_vnet_hdr = !!val;
2028 return 0;
2029 }
2030 default:
2031 return -ENOPROTOOPT;
2032 }
2033 }
2034
2035 static int packet_getsockopt(struct socket *sock, int level, int optname,
2036 char __user *optval, int __user *optlen)
2037 {
2038 int len;
2039 int val;
2040 struct sock *sk = sock->sk;
2041 struct packet_sock *po = pkt_sk(sk);
2042 void *data;
2043 struct tpacket_stats st;
2044
2045 if (level != SOL_PACKET)
2046 return -ENOPROTOOPT;
2047
2048 if (get_user(len, optlen))
2049 return -EFAULT;
2050
2051 if (len < 0)
2052 return -EINVAL;
2053
2054 switch (optname) {
2055 case PACKET_STATISTICS:
2056 if (len > sizeof(struct tpacket_stats))
2057 len = sizeof(struct tpacket_stats);
2058 spin_lock_bh(&sk->sk_receive_queue.lock);
2059 st = po->stats;
2060 memset(&po->stats, 0, sizeof(st));
2061 spin_unlock_bh(&sk->sk_receive_queue.lock);
2062 st.tp_packets += st.tp_drops;
2063
2064 data = &st;
2065 break;
2066 case PACKET_AUXDATA:
2067 if (len > sizeof(int))
2068 len = sizeof(int);
2069 val = po->auxdata;
2070
2071 data = &val;
2072 break;
2073 case PACKET_ORIGDEV:
2074 if (len > sizeof(int))
2075 len = sizeof(int);
2076 val = po->origdev;
2077
2078 data = &val;
2079 break;
2080 case PACKET_VNET_HDR:
2081 if (len > sizeof(int))
2082 len = sizeof(int);
2083 val = po->has_vnet_hdr;
2084
2085 data = &val;
2086 break;
2087 case PACKET_VERSION:
2088 if (len > sizeof(int))
2089 len = sizeof(int);
2090 val = po->tp_version;
2091 data = &val;
2092 break;
2093 case PACKET_HDRLEN:
2094 if (len > sizeof(int))
2095 len = sizeof(int);
2096 if (copy_from_user(&val, optval, len))
2097 return -EFAULT;
2098 switch (val) {
2099 case TPACKET_V1:
2100 val = sizeof(struct tpacket_hdr);
2101 break;
2102 case TPACKET_V2:
2103 val = sizeof(struct tpacket2_hdr);
2104 break;
2105 default:
2106 return -EINVAL;
2107 }
2108 data = &val;
2109 break;
2110 case PACKET_RESERVE:
2111 if (len > sizeof(unsigned int))
2112 len = sizeof(unsigned int);
2113 val = po->tp_reserve;
2114 data = &val;
2115 break;
2116 case PACKET_LOSS:
2117 if (len > sizeof(unsigned int))
2118 len = sizeof(unsigned int);
2119 val = po->tp_loss;
2120 data = &val;
2121 break;
2122 default:
2123 return -ENOPROTOOPT;
2124 }
2125
2126 if (put_user(len, optlen))
2127 return -EFAULT;
2128 if (copy_to_user(optval, data, len))
2129 return -EFAULT;
2130 return 0;
2131 }
2132
2133
2134 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
2135 {
2136 struct sock *sk;
2137 struct hlist_node *node;
2138 struct net_device *dev = data;
2139 struct net *net = dev_net(dev);
2140
2141 rcu_read_lock();
2142 sk_for_each_rcu(sk, node, &net->packet.sklist) {
2143 struct packet_sock *po = pkt_sk(sk);
2144
2145 switch (msg) {
2146 case NETDEV_UNREGISTER:
2147 if (po->mclist)
2148 packet_dev_mclist(dev, po->mclist, -1);
2149 /* fallthrough */
2150
2151 case NETDEV_DOWN:
2152 if (dev->ifindex == po->ifindex) {
2153 spin_lock(&po->bind_lock);
2154 if (po->running) {
2155 __dev_remove_pack(&po->prot_hook);
2156 __sock_put(sk);
2157 po->running = 0;
2158 sk->sk_err = ENETDOWN;
2159 if (!sock_flag(sk, SOCK_DEAD))
2160 sk->sk_error_report(sk);
2161 }
2162 if (msg == NETDEV_UNREGISTER) {
2163 po->ifindex = -1;
2164 po->prot_hook.dev = NULL;
2165 }
2166 spin_unlock(&po->bind_lock);
2167 }
2168 break;
2169 case NETDEV_UP:
2170 if (dev->ifindex == po->ifindex) {
2171 spin_lock(&po->bind_lock);
2172 if (po->num && !po->running) {
2173 dev_add_pack(&po->prot_hook);
2174 sock_hold(sk);
2175 po->running = 1;
2176 }
2177 spin_unlock(&po->bind_lock);
2178 }
2179 break;
2180 }
2181 }
2182 rcu_read_unlock();
2183 return NOTIFY_DONE;
2184 }
2185
2186
2187 static int packet_ioctl(struct socket *sock, unsigned int cmd,
2188 unsigned long arg)
2189 {
2190 struct sock *sk = sock->sk;
2191
2192 switch (cmd) {
2193 case SIOCOUTQ:
2194 {
2195 int amount = sk_wmem_alloc_get(sk);
2196
2197 return put_user(amount, (int __user *)arg);
2198 }
2199 case SIOCINQ:
2200 {
2201 struct sk_buff *skb;
2202 int amount = 0;
2203
2204 spin_lock_bh(&sk->sk_receive_queue.lock);
2205 skb = skb_peek(&sk->sk_receive_queue);
2206 if (skb)
2207 amount = skb->len;
2208 spin_unlock_bh(&sk->sk_receive_queue.lock);
2209 return put_user(amount, (int __user *)arg);
2210 }
2211 case SIOCGSTAMP:
2212 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2213 case SIOCGSTAMPNS:
2214 return sock_get_timestampns(sk, (struct timespec __user *)arg);
2215
2216 #ifdef CONFIG_INET
2217 case SIOCADDRT:
2218 case SIOCDELRT:
2219 case SIOCDARP:
2220 case SIOCGARP:
2221 case SIOCSARP:
2222 case SIOCGIFADDR:
2223 case SIOCSIFADDR:
2224 case SIOCGIFBRDADDR:
2225 case SIOCSIFBRDADDR:
2226 case SIOCGIFNETMASK:
2227 case SIOCSIFNETMASK:
2228 case SIOCGIFDSTADDR:
2229 case SIOCSIFDSTADDR:
2230 case SIOCSIFFLAGS:
2231 return inet_dgram_ops.ioctl(sock, cmd, arg);
2232 #endif
2233
2234 default:
2235 return -ENOIOCTLCMD;
2236 }
2237 return 0;
2238 }
2239
2240 static unsigned int packet_poll(struct file *file, struct socket *sock,
2241 poll_table *wait)
2242 {
2243 struct sock *sk = sock->sk;
2244 struct packet_sock *po = pkt_sk(sk);
2245 unsigned int mask = datagram_poll(file, sock, wait);
2246
2247 spin_lock_bh(&sk->sk_receive_queue.lock);
2248 if (po->rx_ring.pg_vec) {
2249 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
2250 mask |= POLLIN | POLLRDNORM;
2251 }
2252 spin_unlock_bh(&sk->sk_receive_queue.lock);
2253 spin_lock_bh(&sk->sk_write_queue.lock);
2254 if (po->tx_ring.pg_vec) {
2255 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2256 mask |= POLLOUT | POLLWRNORM;
2257 }
2258 spin_unlock_bh(&sk->sk_write_queue.lock);
2259 return mask;
2260 }
2261
2262
2263 /* Dirty? Well, I still did not learn better way to account
2264 * for user mmaps.
2265 */
2266
2267 static void packet_mm_open(struct vm_area_struct *vma)
2268 {
2269 struct file *file = vma->vm_file;
2270 struct socket *sock = file->private_data;
2271 struct sock *sk = sock->sk;
2272
2273 if (sk)
2274 atomic_inc(&pkt_sk(sk)->mapped);
2275 }
2276
2277 static void packet_mm_close(struct vm_area_struct *vma)
2278 {
2279 struct file *file = vma->vm_file;
2280 struct socket *sock = file->private_data;
2281 struct sock *sk = sock->sk;
2282
2283 if (sk)
2284 atomic_dec(&pkt_sk(sk)->mapped);
2285 }
2286
2287 static const struct vm_operations_struct packet_mmap_ops = {
2288 .open = packet_mm_open,
2289 .close = packet_mm_close,
2290 };
2291
2292 static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
2293 {
2294 int i;
2295
2296 for (i = 0; i < len; i++) {
2297 if (likely(pg_vec[i]))
2298 free_pages((unsigned long) pg_vec[i], order);
2299 }
2300 kfree(pg_vec);
2301 }
2302
2303 static inline char *alloc_one_pg_vec_page(unsigned long order)
2304 {
2305 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;
2306
2307 return (char *) __get_free_pages(gfp_flags, order);
2308 }
2309
2310 static char **alloc_pg_vec(struct tpacket_req *req, int order)
2311 {
2312 unsigned int block_nr = req->tp_block_nr;
2313 char **pg_vec;
2314 int i;
2315
2316 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
2317 if (unlikely(!pg_vec))
2318 goto out;
2319
2320 for (i = 0; i < block_nr; i++) {
2321 pg_vec[i] = alloc_one_pg_vec_page(order);
2322 if (unlikely(!pg_vec[i]))
2323 goto out_free_pgvec;
2324 }
2325
2326 out:
2327 return pg_vec;
2328
2329 out_free_pgvec:
2330 free_pg_vec(pg_vec, order, block_nr);
2331 pg_vec = NULL;
2332 goto out;
2333 }
2334
2335 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2336 int closing, int tx_ring)
2337 {
2338 char **pg_vec = NULL;
2339 struct packet_sock *po = pkt_sk(sk);
2340 int was_running, order = 0;
2341 struct packet_ring_buffer *rb;
2342 struct sk_buff_head *rb_queue;
2343 __be16 num;
2344 int err;
2345
2346 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2347 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2348
2349 err = -EBUSY;
2350 if (!closing) {
2351 if (atomic_read(&po->mapped))
2352 goto out;
2353 if (atomic_read(&rb->pending))
2354 goto out;
2355 }
2356
2357 if (req->tp_block_nr) {
2358 /* Sanity tests and some calculations */
2359 err = -EBUSY;
2360 if (unlikely(rb->pg_vec))
2361 goto out;
2362
2363 switch (po->tp_version) {
2364 case TPACKET_V1:
2365 po->tp_hdrlen = TPACKET_HDRLEN;
2366 break;
2367 case TPACKET_V2:
2368 po->tp_hdrlen = TPACKET2_HDRLEN;
2369 break;
2370 }
2371
2372 err = -EINVAL;
2373 if (unlikely((int)req->tp_block_size <= 0))
2374 goto out;
2375 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
2376 goto out;
2377 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
2378 po->tp_reserve))
2379 goto out;
2380 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
2381 goto out;
2382
2383 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2384 if (unlikely(rb->frames_per_block <= 0))
2385 goto out;
2386 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2387 req->tp_frame_nr))
2388 goto out;
2389
2390 err = -ENOMEM;
2391 order = get_order(req->tp_block_size);
2392 pg_vec = alloc_pg_vec(req, order);
2393 if (unlikely(!pg_vec))
2394 goto out;
2395 }
2396 /* Done */
2397 else {
2398 err = -EINVAL;
2399 if (unlikely(req->tp_frame_nr))
2400 goto out;
2401 }
2402
2403 lock_sock(sk);
2404
2405 /* Detach socket from network */
2406 spin_lock(&po->bind_lock);
2407 was_running = po->running;
2408 num = po->num;
2409 if (was_running) {
2410 __dev_remove_pack(&po->prot_hook);
2411 po->num = 0;
2412 po->running = 0;
2413 __sock_put(sk);
2414 }
2415 spin_unlock(&po->bind_lock);
2416
2417 synchronize_net();
2418
2419 err = -EBUSY;
2420 mutex_lock(&po->pg_vec_lock);
2421 if (closing || atomic_read(&po->mapped) == 0) {
2422 err = 0;
2423 #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
2424 spin_lock_bh(&rb_queue->lock);
2425 pg_vec = XC(rb->pg_vec, pg_vec);
2426 rb->frame_max = (req->tp_frame_nr - 1);
2427 rb->head = 0;
2428 rb->frame_size = req->tp_frame_size;
2429 spin_unlock_bh(&rb_queue->lock);
2430
2431 order = XC(rb->pg_vec_order, order);
2432 req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr);
2433
2434 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2435 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2436 tpacket_rcv : packet_rcv;
2437 skb_queue_purge(rb_queue);
2438 #undef XC
2439 if (atomic_read(&po->mapped))
2440 pr_err("packet_mmap: vma is busy: %d\n",
2441 atomic_read(&po->mapped));
2442 }
2443 mutex_unlock(&po->pg_vec_lock);
2444
2445 spin_lock(&po->bind_lock);
2446 if (was_running && !po->running) {
2447 sock_hold(sk);
2448 po->running = 1;
2449 po->num = num;
2450 dev_add_pack(&po->prot_hook);
2451 }
2452 spin_unlock(&po->bind_lock);
2453
2454 release_sock(sk);
2455
2456 if (pg_vec)
2457 free_pg_vec(pg_vec, order, req->tp_block_nr);
2458 out:
2459 return err;
2460 }
2461
2462 static int packet_mmap(struct file *file, struct socket *sock,
2463 struct vm_area_struct *vma)
2464 {
2465 struct sock *sk = sock->sk;
2466 struct packet_sock *po = pkt_sk(sk);
2467 unsigned long size, expected_size;
2468 struct packet_ring_buffer *rb;
2469 unsigned long start;
2470 int err = -EINVAL;
2471 int i;
2472
2473 if (vma->vm_pgoff)
2474 return -EINVAL;
2475
2476 mutex_lock(&po->pg_vec_lock);
2477
2478 expected_size = 0;
2479 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2480 if (rb->pg_vec) {
2481 expected_size += rb->pg_vec_len
2482 * rb->pg_vec_pages
2483 * PAGE_SIZE;
2484 }
2485 }
2486
2487 if (expected_size == 0)
2488 goto out;
2489
2490 size = vma->vm_end - vma->vm_start;
2491 if (size != expected_size)
2492 goto out;
2493
2494 start = vma->vm_start;
2495 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2496 if (rb->pg_vec == NULL)
2497 continue;
2498
2499 for (i = 0; i < rb->pg_vec_len; i++) {
2500 struct page *page = virt_to_page(rb->pg_vec[i]);
2501 int pg_num;
2502
2503 for (pg_num = 0; pg_num < rb->pg_vec_pages;
2504 pg_num++, page++) {
2505 err = vm_insert_page(vma, start, page);
2506 if (unlikely(err))
2507 goto out;
2508 start += PAGE_SIZE;
2509 }
2510 }
2511 }
2512
2513 atomic_inc(&po->mapped);
2514 vma->vm_ops = &packet_mmap_ops;
2515 err = 0;
2516
2517 out:
2518 mutex_unlock(&po->pg_vec_lock);
2519 return err;
2520 }
2521
2522 static const struct proto_ops packet_ops_spkt = {
2523 .family = PF_PACKET,
2524 .owner = THIS_MODULE,
2525 .release = packet_release,
2526 .bind = packet_bind_spkt,
2527 .connect = sock_no_connect,
2528 .socketpair = sock_no_socketpair,
2529 .accept = sock_no_accept,
2530 .getname = packet_getname_spkt,
2531 .poll = datagram_poll,
2532 .ioctl = packet_ioctl,
2533 .listen = sock_no_listen,
2534 .shutdown = sock_no_shutdown,
2535 .setsockopt = sock_no_setsockopt,
2536 .getsockopt = sock_no_getsockopt,
2537 .sendmsg = packet_sendmsg_spkt,
2538 .recvmsg = packet_recvmsg,
2539 .mmap = sock_no_mmap,
2540 .sendpage = sock_no_sendpage,
2541 };
2542
2543 static const struct proto_ops packet_ops = {
2544 .family = PF_PACKET,
2545 .owner = THIS_MODULE,
2546 .release = packet_release,
2547 .bind = packet_bind,
2548 .connect = sock_no_connect,
2549 .socketpair = sock_no_socketpair,
2550 .accept = sock_no_accept,
2551 .getname = packet_getname,
2552 .poll = packet_poll,
2553 .ioctl = packet_ioctl,
2554 .listen = sock_no_listen,
2555 .shutdown = sock_no_shutdown,
2556 .setsockopt = packet_setsockopt,
2557 .getsockopt = packet_getsockopt,
2558 .sendmsg = packet_sendmsg,
2559 .recvmsg = packet_recvmsg,
2560 .mmap = packet_mmap,
2561 .sendpage = sock_no_sendpage,
2562 };
2563
2564 static const struct net_proto_family packet_family_ops = {
2565 .family = PF_PACKET,
2566 .create = packet_create,
2567 .owner = THIS_MODULE,
2568 };
2569
2570 static struct notifier_block packet_netdev_notifier = {
2571 .notifier_call = packet_notifier,
2572 };
2573
2574 #ifdef CONFIG_PROC_FS
2575
2576 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2577 __acquires(RCU)
2578 {
2579 struct net *net = seq_file_net(seq);
2580
2581 rcu_read_lock();
2582 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
2583 }
2584
2585 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2586 {
2587 struct net *net = seq_file_net(seq);
2588 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
2589 }
2590
2591 static void packet_seq_stop(struct seq_file *seq, void *v)
2592 __releases(RCU)
2593 {
2594 rcu_read_unlock();
2595 }
2596
2597 static int packet_seq_show(struct seq_file *seq, void *v)
2598 {
2599 if (v == SEQ_START_TOKEN)
2600 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2601 else {
2602 struct sock *s = sk_entry(v);
2603 const struct packet_sock *po = pkt_sk(s);
2604
2605 seq_printf(seq,
2606 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2607 s,
2608 atomic_read(&s->sk_refcnt),
2609 s->sk_type,
2610 ntohs(po->num),
2611 po->ifindex,
2612 po->running,
2613 atomic_read(&s->sk_rmem_alloc),
2614 sock_i_uid(s),
2615 sock_i_ino(s));
2616 }
2617
2618 return 0;
2619 }
2620
2621 static const struct seq_operations packet_seq_ops = {
2622 .start = packet_seq_start,
2623 .next = packet_seq_next,
2624 .stop = packet_seq_stop,
2625 .show = packet_seq_show,
2626 };
2627
2628 static int packet_seq_open(struct inode *inode, struct file *file)
2629 {
2630 return seq_open_net(inode, file, &packet_seq_ops,
2631 sizeof(struct seq_net_private));
2632 }
2633
2634 static const struct file_operations packet_seq_fops = {
2635 .owner = THIS_MODULE,
2636 .open = packet_seq_open,
2637 .read = seq_read,
2638 .llseek = seq_lseek,
2639 .release = seq_release_net,
2640 };
2641
2642 #endif
2643
2644 static int __net_init packet_net_init(struct net *net)
2645 {
2646 spin_lock_init(&net->packet.sklist_lock);
2647 INIT_HLIST_HEAD(&net->packet.sklist);
2648
2649 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2650 return -ENOMEM;
2651
2652 return 0;
2653 }
2654
2655 static void __net_exit packet_net_exit(struct net *net)
2656 {
2657 proc_net_remove(net, "packet");
2658 }
2659
2660 static struct pernet_operations packet_net_ops = {
2661 .init = packet_net_init,
2662 .exit = packet_net_exit,
2663 };
2664
2665
2666 static void __exit packet_exit(void)
2667 {
2668 unregister_netdevice_notifier(&packet_netdev_notifier);
2669 unregister_pernet_subsys(&packet_net_ops);
2670 sock_unregister(PF_PACKET);
2671 proto_unregister(&packet_proto);
2672 }
2673
2674 static int __init packet_init(void)
2675 {
2676 int rc = proto_register(&packet_proto, 0);
2677
2678 if (rc != 0)
2679 goto out;
2680
2681 sock_register(&packet_family_ops);
2682 register_pernet_subsys(&packet_net_ops);
2683 register_netdevice_notifier(&packet_netdev_notifier);
2684 out:
2685 return rc;
2686 }
2687
2688 module_init(packet_init);
2689 module_exit(packet_exit);
2690 MODULE_LICENSE("GPL");
2691 MODULE_ALIAS_NETPROTO(PF_PACKET);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree