projects / deliverable / linux.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[deliverable/linux.git] / net / packet / af_packet.c
... / ...
CommitLineData
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 <linux/vmalloc.h>
65#include <net/net_namespace.h>
66#include <net/ip.h>
67#include <net/protocol.h>
68#include <linux/skbuff.h>
69#include <net/sock.h>
70#include <linux/errno.h>
71#include <linux/timer.h>
72#include <asm/system.h>
73#include <asm/uaccess.h>
74#include <asm/ioctls.h>
75#include <asm/page.h>
76#include <asm/cacheflush.h>
77#include <asm/io.h>
78#include <linux/proc_fs.h>
79#include <linux/seq_file.h>
80#include <linux/poll.h>
81#include <linux/module.h>
82#include <linux/init.h>
83#include <linux/mutex.h>
84#include <linux/if_vlan.h>
85#include <linux/virtio_net.h>
86#include <linux/errqueue.h>
87#include <linux/net_tstamp.h>
88
89#ifdef CONFIG_INET
90#include <net/inet_common.h>
91#endif
92
93/*
94 Assumptions:
95 - if device has no dev->hard_header routine, it adds and removes ll header
96 inside itself. In this case ll header is invisible outside of device,
97 but higher levels still should reserve dev->hard_header_len.
98 Some devices are enough clever to reallocate skb, when header
99 will not fit to reserved space (tunnel), another ones are silly
100 (PPP).
101 - packet socket receives packets with pulled ll header,
102 so that SOCK_RAW should push it back.
103
104On receive:
105-----------
106
107Incoming, dev->hard_header!=NULL
108 mac_header -> ll header
109 data -> data
110
111Outgoing, dev->hard_header!=NULL
112 mac_header -> ll header
113 data -> ll header
114
115Incoming, dev->hard_header==NULL
116 mac_header -> UNKNOWN position. It is very likely, that it points to ll
117 header. PPP makes it, that is wrong, because introduce
118 assymetry between rx and tx paths.
119 data -> data
120
121Outgoing, dev->hard_header==NULL
122 mac_header -> data. ll header is still not built!
123 data -> data
124
125Resume
126 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
127
128
129On transmit:
130------------
131
132dev->hard_header != NULL
133 mac_header -> ll header
134 data -> ll header
135
136dev->hard_header == NULL (ll header is added by device, we cannot control it)
137 mac_header -> data
138 data -> data
139
140 We should set nh.raw on output to correct posistion,
141 packet classifier depends on it.
142 */
143
144/* Private packet socket structures. */
145
146struct packet_mclist {
147 struct packet_mclist *next;
148 int ifindex;
149 int count;
150 unsigned short type;
151 unsigned short alen;
152 unsigned char addr[MAX_ADDR_LEN];
153};
154/* identical to struct packet_mreq except it has
155 * a longer address field.
156 */
157struct packet_mreq_max {
158 int mr_ifindex;
159 unsigned short mr_type;
160 unsigned short mr_alen;
161 unsigned char mr_address[MAX_ADDR_LEN];
162};
163
164static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
165 int closing, int tx_ring);
166
167struct pgv {
168 char *buffer;
169};
170
171struct packet_ring_buffer {
172 struct pgv *pg_vec;
173 unsigned int head;
174 unsigned int frames_per_block;
175 unsigned int frame_size;
176 unsigned int frame_max;
177
178 unsigned int pg_vec_order;
179 unsigned int pg_vec_pages;
180 unsigned int pg_vec_len;
181
182 atomic_t pending;
183};
184
185struct packet_sock;
186static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
187
188static void packet_flush_mclist(struct sock *sk);
189
190struct packet_sock {
191 /* struct sock has to be the first member of packet_sock */
192 struct sock sk;
193 struct tpacket_stats stats;
194 struct packet_ring_buffer rx_ring;
195 struct packet_ring_buffer tx_ring;
196 int copy_thresh;
197 spinlock_t bind_lock;
198 struct mutex pg_vec_lock;
199 unsigned int running:1, /* prot_hook is attached*/
200 auxdata:1,
201 origdev:1,
202 has_vnet_hdr:1;
203 int ifindex; /* bound device */
204 __be16 num;
205 struct packet_mclist *mclist;
206 atomic_t mapped;
207 enum tpacket_versions tp_version;
208 unsigned int tp_hdrlen;
209 unsigned int tp_reserve;
210 unsigned int tp_loss:1;
211 unsigned int tp_tstamp;
212 struct packet_type prot_hook ____cacheline_aligned_in_smp;
213};
214
215struct packet_skb_cb {
216 unsigned int origlen;
217 union {
218 struct sockaddr_pkt pkt;
219 struct sockaddr_ll ll;
220 } sa;
221};
222
223#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
224
225static inline __pure struct page *pgv_to_page(void *addr)
226{
227 if (is_vmalloc_addr(addr))
228 return vmalloc_to_page(addr);
229 return virt_to_page(addr);
230}
231
232static void __packet_set_status(struct packet_sock *po, void *frame, int status)
233{
234 union {
235 struct tpacket_hdr *h1;
236 struct tpacket2_hdr *h2;
237 void *raw;
238 } h;
239
240 h.raw = frame;
241 switch (po->tp_version) {
242 case TPACKET_V1:
243 h.h1->tp_status = status;
244 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
245 break;
246 case TPACKET_V2:
247 h.h2->tp_status = status;
248 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
249 break;
250 default:
251 pr_err("TPACKET version not supported\n");
252 BUG();
253 }
254
255 smp_wmb();
256}
257
258static int __packet_get_status(struct packet_sock *po, void *frame)
259{
260 union {
261 struct tpacket_hdr *h1;
262 struct tpacket2_hdr *h2;
263 void *raw;
264 } h;
265
266 smp_rmb();
267
268 h.raw = frame;
269 switch (po->tp_version) {
270 case TPACKET_V1:
271 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
272 return h.h1->tp_status;
273 case TPACKET_V2:
274 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
275 return h.h2->tp_status;
276 default:
277 pr_err("TPACKET version not supported\n");
278 BUG();
279 return 0;
280 }
281}
282
283static void *packet_lookup_frame(struct packet_sock *po,
284 struct packet_ring_buffer *rb,
285 unsigned int position,
286 int status)
287{
288 unsigned int pg_vec_pos, frame_offset;
289 union {
290 struct tpacket_hdr *h1;
291 struct tpacket2_hdr *h2;
292 void *raw;
293 } h;
294
295 pg_vec_pos = position / rb->frames_per_block;
296 frame_offset = position % rb->frames_per_block;
297
298 h.raw = rb->pg_vec[pg_vec_pos].buffer +
299 (frame_offset * rb->frame_size);
300
301 if (status != __packet_get_status(po, h.raw))
302 return NULL;
303
304 return h.raw;
305}
306
307static inline void *packet_current_frame(struct packet_sock *po,
308 struct packet_ring_buffer *rb,
309 int status)
310{
311 return packet_lookup_frame(po, rb, rb->head, status);
312}
313
314static inline void *packet_previous_frame(struct packet_sock *po,
315 struct packet_ring_buffer *rb,
316 int status)
317{
318 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
319 return packet_lookup_frame(po, rb, previous, status);
320}
321
322static inline void packet_increment_head(struct packet_ring_buffer *buff)
323{
324 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
325}
326
327static inline struct packet_sock *pkt_sk(struct sock *sk)
328{
329 return (struct packet_sock *)sk;
330}
331
332static void packet_sock_destruct(struct sock *sk)
333{
334 skb_queue_purge(&sk->sk_error_queue);
335
336 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
337 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
338
339 if (!sock_flag(sk, SOCK_DEAD)) {
340 pr_err("Attempt to release alive packet socket: %p\n", sk);
341 return;
342 }
343
344 sk_refcnt_debug_dec(sk);
345}
346
347
348static const struct proto_ops packet_ops;
349
350static const struct proto_ops packet_ops_spkt;
351
352static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
353 struct packet_type *pt, struct net_device *orig_dev)
354{
355 struct sock *sk;
356 struct sockaddr_pkt *spkt;
357
358 /*
359 * When we registered the protocol we saved the socket in the data
360 * field for just this event.
361 */
362
363 sk = pt->af_packet_priv;
364
365 /*
366 * Yank back the headers [hope the device set this
367 * right or kerboom...]
368 *
369 * Incoming packets have ll header pulled,
370 * push it back.
371 *
372 * For outgoing ones skb->data == skb_mac_header(skb)
373 * so that this procedure is noop.
374 */
375
376 if (skb->pkt_type == PACKET_LOOPBACK)
377 goto out;
378
379 if (!net_eq(dev_net(dev), sock_net(sk)))
380 goto out;
381
382 skb = skb_share_check(skb, GFP_ATOMIC);
383 if (skb == NULL)
384 goto oom;
385
386 /* drop any routing info */
387 skb_dst_drop(skb);
388
389 /* drop conntrack reference */
390 nf_reset(skb);
391
392 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
393
394 skb_push(skb, skb->data - skb_mac_header(skb));
395
396 /*
397 * The SOCK_PACKET socket receives _all_ frames.
398 */
399
400 spkt->spkt_family = dev->type;
401 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
402 spkt->spkt_protocol = skb->protocol;
403
404 /*
405 * Charge the memory to the socket. This is done specifically
406 * to prevent sockets using all the memory up.
407 */
408
409 if (sock_queue_rcv_skb(sk, skb) == 0)
410 return 0;
411
412out:
413 kfree_skb(skb);
414oom:
415 return 0;
416}
417
418
419/*
420 * Output a raw packet to a device layer. This bypasses all the other
421 * protocol layers and you must therefore supply it with a complete frame
422 */
423
424static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
425 struct msghdr *msg, size_t len)
426{
427 struct sock *sk = sock->sk;
428 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
429 struct sk_buff *skb = NULL;
430 struct net_device *dev;
431 __be16 proto = 0;
432 int err;
433
434 /*
435 * Get and verify the address.
436 */
437
438 if (saddr) {
439 if (msg->msg_namelen < sizeof(struct sockaddr))
440 return -EINVAL;
441 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
442 proto = saddr->spkt_protocol;
443 } else
444 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
445
446 /*
447 * Find the device first to size check it
448 */
449
450 saddr->spkt_device[13] = 0;
451retry:
452 rcu_read_lock();
453 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
454 err = -ENODEV;
455 if (dev == NULL)
456 goto out_unlock;
457
458 err = -ENETDOWN;
459 if (!(dev->flags & IFF_UP))
460 goto out_unlock;
461
462 /*
463 * You may not queue a frame bigger than the mtu. This is the lowest level
464 * raw protocol and you must do your own fragmentation at this level.
465 */
466
467 err = -EMSGSIZE;
468 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
469 goto out_unlock;
470
471 if (!skb) {
472 size_t reserved = LL_RESERVED_SPACE(dev);
473 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
474
475 rcu_read_unlock();
476 skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL);
477 if (skb == NULL)
478 return -ENOBUFS;
479 /* FIXME: Save some space for broken drivers that write a hard
480 * header at transmission time by themselves. PPP is the notable
481 * one here. This should really be fixed at the driver level.
482 */
483 skb_reserve(skb, reserved);
484 skb_reset_network_header(skb);
485
486 /* Try to align data part correctly */
487 if (hhlen) {
488 skb->data -= hhlen;
489 skb->tail -= hhlen;
490 if (len < hhlen)
491 skb_reset_network_header(skb);
492 }
493 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
494 if (err)
495 goto out_free;
496 goto retry;
497 }
498
499 if (len > (dev->mtu + dev->hard_header_len)) {
500 /* Earlier code assumed this would be a VLAN pkt,
501 * double-check this now that we have the actual
502 * packet in hand.
503 */
504 struct ethhdr *ehdr;
505 skb_reset_mac_header(skb);
506 ehdr = eth_hdr(skb);
507 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
508 err = -EMSGSIZE;
509 goto out_unlock;
510 }
511 }
512
513 skb->protocol = proto;
514 skb->dev = dev;
515 skb->priority = sk->sk_priority;
516 skb->mark = sk->sk_mark;
517 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
518 if (err < 0)
519 goto out_unlock;
520
521 dev_queue_xmit(skb);
522 rcu_read_unlock();
523 return len;
524
525out_unlock:
526 rcu_read_unlock();
527out_free:
528 kfree_skb(skb);
529 return err;
530}
531
532static inline unsigned int run_filter(const struct sk_buff *skb,
533 const struct sock *sk,
534 unsigned int res)
535{
536 struct sk_filter *filter;
537
538 rcu_read_lock();
539 filter = rcu_dereference(sk->sk_filter);
540 if (filter != NULL)
541 res = SK_RUN_FILTER(filter, skb);
542 rcu_read_unlock();
543
544 return res;
545}
546
547/*
548 * This function makes lazy skb cloning in hope that most of packets
549 * are discarded by BPF.
550 *
551 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
552 * and skb->cb are mangled. It works because (and until) packets
553 * falling here are owned by current CPU. Output packets are cloned
554 * by dev_queue_xmit_nit(), input packets are processed by net_bh
555 * sequencially, so that if we return skb to original state on exit,
556 * we will not harm anyone.
557 */
558
559static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
560 struct packet_type *pt, struct net_device *orig_dev)
561{
562 struct sock *sk;
563 struct sockaddr_ll *sll;
564 struct packet_sock *po;
565 u8 *skb_head = skb->data;
566 int skb_len = skb->len;
567 unsigned int snaplen, res;
568
569 if (skb->pkt_type == PACKET_LOOPBACK)
570 goto drop;
571
572 sk = pt->af_packet_priv;
573 po = pkt_sk(sk);
574
575 if (!net_eq(dev_net(dev), sock_net(sk)))
576 goto drop;
577
578 skb->dev = dev;
579
580 if (dev->header_ops) {
581 /* The device has an explicit notion of ll header,
582 * exported to higher levels.
583 *
584 * Otherwise, the device hides details of its frame
585 * structure, so that corresponding packet head is
586 * never delivered to user.
587 */
588 if (sk->sk_type != SOCK_DGRAM)
589 skb_push(skb, skb->data - skb_mac_header(skb));
590 else if (skb->pkt_type == PACKET_OUTGOING) {
591 /* Special case: outgoing packets have ll header at head */
592 skb_pull(skb, skb_network_offset(skb));
593 }
594 }
595
596 snaplen = skb->len;
597
598 res = run_filter(skb, sk, snaplen);
599 if (!res)
600 goto drop_n_restore;
601 if (snaplen > res)
602 snaplen = res;
603
604 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
605 (unsigned)sk->sk_rcvbuf)
606 goto drop_n_acct;
607
608 if (skb_shared(skb)) {
609 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
610 if (nskb == NULL)
611 goto drop_n_acct;
612
613 if (skb_head != skb->data) {
614 skb->data = skb_head;
615 skb->len = skb_len;
616 }
617 kfree_skb(skb);
618 skb = nskb;
619 }
620
621 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
622 sizeof(skb->cb));
623
624 sll = &PACKET_SKB_CB(skb)->sa.ll;
625 sll->sll_family = AF_PACKET;
626 sll->sll_hatype = dev->type;
627 sll->sll_protocol = skb->protocol;
628 sll->sll_pkttype = skb->pkt_type;
629 if (unlikely(po->origdev))
630 sll->sll_ifindex = orig_dev->ifindex;
631 else
632 sll->sll_ifindex = dev->ifindex;
633
634 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
635
636 PACKET_SKB_CB(skb)->origlen = skb->len;
637
638 if (pskb_trim(skb, snaplen))
639 goto drop_n_acct;
640
641 skb_set_owner_r(skb, sk);
642 skb->dev = NULL;
643 skb_dst_drop(skb);
644
645 /* drop conntrack reference */
646 nf_reset(skb);
647
648 spin_lock(&sk->sk_receive_queue.lock);
649 po->stats.tp_packets++;
650 skb->dropcount = atomic_read(&sk->sk_drops);
651 __skb_queue_tail(&sk->sk_receive_queue, skb);
652 spin_unlock(&sk->sk_receive_queue.lock);
653 sk->sk_data_ready(sk, skb->len);
654 return 0;
655
656drop_n_acct:
657 po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
658
659drop_n_restore:
660 if (skb_head != skb->data && skb_shared(skb)) {
661 skb->data = skb_head;
662 skb->len = skb_len;
663 }
664drop:
665 consume_skb(skb);
666 return 0;
667}
668
669static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
670 struct packet_type *pt, struct net_device *orig_dev)
671{
672 struct sock *sk;
673 struct packet_sock *po;
674 struct sockaddr_ll *sll;
675 union {
676 struct tpacket_hdr *h1;
677 struct tpacket2_hdr *h2;
678 void *raw;
679 } h;
680 u8 *skb_head = skb->data;
681 int skb_len = skb->len;
682 unsigned int snaplen, res;
683 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
684 unsigned short macoff, netoff, hdrlen;
685 struct sk_buff *copy_skb = NULL;
686 struct timeval tv;
687 struct timespec ts;
688 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
689
690 if (skb->pkt_type == PACKET_LOOPBACK)
691 goto drop;
692
693 sk = pt->af_packet_priv;
694 po = pkt_sk(sk);
695
696 if (!net_eq(dev_net(dev), sock_net(sk)))
697 goto drop;
698
699 if (dev->header_ops) {
700 if (sk->sk_type != SOCK_DGRAM)
701 skb_push(skb, skb->data - skb_mac_header(skb));
702 else if (skb->pkt_type == PACKET_OUTGOING) {
703 /* Special case: outgoing packets have ll header at head */
704 skb_pull(skb, skb_network_offset(skb));
705 }
706 }
707
708 if (skb->ip_summed == CHECKSUM_PARTIAL)
709 status |= TP_STATUS_CSUMNOTREADY;
710
711 snaplen = skb->len;
712
713 res = run_filter(skb, sk, snaplen);
714 if (!res)
715 goto drop_n_restore;
716 if (snaplen > res)
717 snaplen = res;
718
719 if (sk->sk_type == SOCK_DGRAM) {
720 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
721 po->tp_reserve;
722 } else {
723 unsigned maclen = skb_network_offset(skb);
724 netoff = TPACKET_ALIGN(po->tp_hdrlen +
725 (maclen < 16 ? 16 : maclen)) +
726 po->tp_reserve;
727 macoff = netoff - maclen;
728 }
729
730 if (macoff + snaplen > po->rx_ring.frame_size) {
731 if (po->copy_thresh &&
732 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
733 (unsigned)sk->sk_rcvbuf) {
734 if (skb_shared(skb)) {
735 copy_skb = skb_clone(skb, GFP_ATOMIC);
736 } else {
737 copy_skb = skb_get(skb);
738 skb_head = skb->data;
739 }
740 if (copy_skb)
741 skb_set_owner_r(copy_skb, sk);
742 }
743 snaplen = po->rx_ring.frame_size - macoff;
744 if ((int)snaplen < 0)
745 snaplen = 0;
746 }
747
748 spin_lock(&sk->sk_receive_queue.lock);
749 h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
750 if (!h.raw)
751 goto ring_is_full;
752 packet_increment_head(&po->rx_ring);
753 po->stats.tp_packets++;
754 if (copy_skb) {
755 status |= TP_STATUS_COPY;
756 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
757 }
758 if (!po->stats.tp_drops)
759 status &= ~TP_STATUS_LOSING;
760 spin_unlock(&sk->sk_receive_queue.lock);
761
762 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
763
764 switch (po->tp_version) {
765 case TPACKET_V1:
766 h.h1->tp_len = skb->len;
767 h.h1->tp_snaplen = snaplen;
768 h.h1->tp_mac = macoff;
769 h.h1->tp_net = netoff;
770 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
771 && shhwtstamps->syststamp.tv64)
772 tv = ktime_to_timeval(shhwtstamps->syststamp);
773 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
774 && shhwtstamps->hwtstamp.tv64)
775 tv = ktime_to_timeval(shhwtstamps->hwtstamp);
776 else if (skb->tstamp.tv64)
777 tv = ktime_to_timeval(skb->tstamp);
778 else
779 do_gettimeofday(&tv);
780 h.h1->tp_sec = tv.tv_sec;
781 h.h1->tp_usec = tv.tv_usec;
782 hdrlen = sizeof(*h.h1);
783 break;
784 case TPACKET_V2:
785 h.h2->tp_len = skb->len;
786 h.h2->tp_snaplen = snaplen;
787 h.h2->tp_mac = macoff;
788 h.h2->tp_net = netoff;
789 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
790 && shhwtstamps->syststamp.tv64)
791 ts = ktime_to_timespec(shhwtstamps->syststamp);
792 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
793 && shhwtstamps->hwtstamp.tv64)
794 ts = ktime_to_timespec(shhwtstamps->hwtstamp);
795 else if (skb->tstamp.tv64)
796 ts = ktime_to_timespec(skb->tstamp);
797 else
798 getnstimeofday(&ts);
799 h.h2->tp_sec = ts.tv_sec;
800 h.h2->tp_nsec = ts.tv_nsec;
801 if (vlan_tx_tag_present(skb)) {
802 h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
803 status |= TP_STATUS_VLAN_VALID;
804 } else {
805 h.h2->tp_vlan_tci = 0;
806 }
807 hdrlen = sizeof(*h.h2);
808 break;
809 default:
810 BUG();
811 }
812
813 sll = h.raw + TPACKET_ALIGN(hdrlen);
814 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
815 sll->sll_family = AF_PACKET;
816 sll->sll_hatype = dev->type;
817 sll->sll_protocol = skb->protocol;
818 sll->sll_pkttype = skb->pkt_type;
819 if (unlikely(po->origdev))
820 sll->sll_ifindex = orig_dev->ifindex;
821 else
822 sll->sll_ifindex = dev->ifindex;
823
824 __packet_set_status(po, h.raw, status);
825 smp_mb();
826#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
827 {
828 u8 *start, *end;
829
830 end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen);
831 for (start = h.raw; start < end; start += PAGE_SIZE)
832 flush_dcache_page(pgv_to_page(start));
833 }
834#endif
835
836 sk->sk_data_ready(sk, 0);
837
838drop_n_restore:
839 if (skb_head != skb->data && skb_shared(skb)) {
840 skb->data = skb_head;
841 skb->len = skb_len;
842 }
843drop:
844 kfree_skb(skb);
845 return 0;
846
847ring_is_full:
848 po->stats.tp_drops++;
849 spin_unlock(&sk->sk_receive_queue.lock);
850
851 sk->sk_data_ready(sk, 0);
852 kfree_skb(copy_skb);
853 goto drop_n_restore;
854}
855
856static void tpacket_destruct_skb(struct sk_buff *skb)
857{
858 struct packet_sock *po = pkt_sk(skb->sk);
859 void *ph;
860
861 BUG_ON(skb == NULL);
862
863 if (likely(po->tx_ring.pg_vec)) {
864 ph = skb_shinfo(skb)->destructor_arg;
865 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
866 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
867 atomic_dec(&po->tx_ring.pending);
868 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
869 }
870
871 sock_wfree(skb);
872}
873
874static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
875 void *frame, struct net_device *dev, int size_max,
876 __be16 proto, unsigned char *addr)
877{
878 union {
879 struct tpacket_hdr *h1;
880 struct tpacket2_hdr *h2;
881 void *raw;
882 } ph;
883 int to_write, offset, len, tp_len, nr_frags, len_max;
884 struct socket *sock = po->sk.sk_socket;
885 struct page *page;
886 void *data;
887 int err;
888
889 ph.raw = frame;
890
891 skb->protocol = proto;
892 skb->dev = dev;
893 skb->priority = po->sk.sk_priority;
894 skb->mark = po->sk.sk_mark;
895 skb_shinfo(skb)->destructor_arg = ph.raw;
896
897 switch (po->tp_version) {
898 case TPACKET_V2:
899 tp_len = ph.h2->tp_len;
900 break;
901 default:
902 tp_len = ph.h1->tp_len;
903 break;
904 }
905 if (unlikely(tp_len > size_max)) {
906 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
907 return -EMSGSIZE;
908 }
909
910 skb_reserve(skb, LL_RESERVED_SPACE(dev));
911 skb_reset_network_header(skb);
912
913 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
914 to_write = tp_len;
915
916 if (sock->type == SOCK_DGRAM) {
917 err = dev_hard_header(skb, dev, ntohs(proto), addr,
918 NULL, tp_len);
919 if (unlikely(err < 0))
920 return -EINVAL;
921 } else if (dev->hard_header_len) {
922 /* net device doesn't like empty head */
923 if (unlikely(tp_len <= dev->hard_header_len)) {
924 pr_err("packet size is too short (%d < %d)\n",
925 tp_len, dev->hard_header_len);
926 return -EINVAL;
927 }
928
929 skb_push(skb, dev->hard_header_len);
930 err = skb_store_bits(skb, 0, data,
931 dev->hard_header_len);
932 if (unlikely(err))
933 return err;
934
935 data += dev->hard_header_len;
936 to_write -= dev->hard_header_len;
937 }
938
939 err = -EFAULT;
940 offset = offset_in_page(data);
941 len_max = PAGE_SIZE - offset;
942 len = ((to_write > len_max) ? len_max : to_write);
943
944 skb->data_len = to_write;
945 skb->len += to_write;
946 skb->truesize += to_write;
947 atomic_add(to_write, &po->sk.sk_wmem_alloc);
948
949 while (likely(to_write)) {
950 nr_frags = skb_shinfo(skb)->nr_frags;
951
952 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
953 pr_err("Packet exceed the number of skb frags(%lu)\n",
954 MAX_SKB_FRAGS);
955 return -EFAULT;
956 }
957
958 page = pgv_to_page(data);
959 data += len;
960 flush_dcache_page(page);
961 get_page(page);
962 skb_fill_page_desc(skb, nr_frags, page, offset, len);
963 to_write -= len;
964 offset = 0;
965 len_max = PAGE_SIZE;
966 len = ((to_write > len_max) ? len_max : to_write);
967 }
968
969 return tp_len;
970}
971
972static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
973{
974 struct sk_buff *skb;
975 struct net_device *dev;
976 __be16 proto;
977 int ifindex, err, reserve = 0;
978 void *ph;
979 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
980 int tp_len, size_max;
981 unsigned char *addr;
982 int len_sum = 0;
983 int status = 0;
984
985 mutex_lock(&po->pg_vec_lock);
986
987 err = -EBUSY;
988 if (saddr == NULL) {
989 ifindex = po->ifindex;
990 proto = po->num;
991 addr = NULL;
992 } else {
993 err = -EINVAL;
994 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
995 goto out;
996 if (msg->msg_namelen < (saddr->sll_halen
997 + offsetof(struct sockaddr_ll,
998 sll_addr)))
999 goto out;
1000 ifindex = saddr->sll_ifindex;
1001 proto = saddr->sll_protocol;
1002 addr = saddr->sll_addr;
1003 }
1004
1005 dev = dev_get_by_index(sock_net(&po->sk), ifindex);
1006 err = -ENXIO;
1007 if (unlikely(dev == NULL))
1008 goto out;
1009
1010 reserve = dev->hard_header_len;
1011
1012 err = -ENETDOWN;
1013 if (unlikely(!(dev->flags & IFF_UP)))
1014 goto out_put;
1015
1016 size_max = po->tx_ring.frame_size
1017 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
1018
1019 if (size_max > dev->mtu + reserve)
1020 size_max = dev->mtu + reserve;
1021
1022 do {
1023 ph = packet_current_frame(po, &po->tx_ring,
1024 TP_STATUS_SEND_REQUEST);
1025
1026 if (unlikely(ph == NULL)) {
1027 schedule();
1028 continue;
1029 }
1030
1031 status = TP_STATUS_SEND_REQUEST;
1032 skb = sock_alloc_send_skb(&po->sk,
1033 LL_ALLOCATED_SPACE(dev)
1034 + sizeof(struct sockaddr_ll),
1035 0, &err);
1036
1037 if (unlikely(skb == NULL))
1038 goto out_status;
1039
1040 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1041 addr);
1042
1043 if (unlikely(tp_len < 0)) {
1044 if (po->tp_loss) {
1045 __packet_set_status(po, ph,
1046 TP_STATUS_AVAILABLE);
1047 packet_increment_head(&po->tx_ring);
1048 kfree_skb(skb);
1049 continue;
1050 } else {
1051 status = TP_STATUS_WRONG_FORMAT;
1052 err = tp_len;
1053 goto out_status;
1054 }
1055 }
1056
1057 skb->destructor = tpacket_destruct_skb;
1058 __packet_set_status(po, ph, TP_STATUS_SENDING);
1059 atomic_inc(&po->tx_ring.pending);
1060
1061 status = TP_STATUS_SEND_REQUEST;
1062 err = dev_queue_xmit(skb);
1063 if (unlikely(err > 0)) {
1064 err = net_xmit_errno(err);
1065 if (err && __packet_get_status(po, ph) ==
1066 TP_STATUS_AVAILABLE) {
1067 /* skb was destructed already */
1068 skb = NULL;
1069 goto out_status;
1070 }
1071 /*
1072 * skb was dropped but not destructed yet;
1073 * let's treat it like congestion or err < 0
1074 */
1075 err = 0;
1076 }
1077 packet_increment_head(&po->tx_ring);
1078 len_sum += tp_len;
1079 } while (likely((ph != NULL) ||
1080 ((!(msg->msg_flags & MSG_DONTWAIT)) &&
1081 (atomic_read(&po->tx_ring.pending))))
1082 );
1083
1084 err = len_sum;
1085 goto out_put;
1086
1087out_status:
1088 __packet_set_status(po, ph, status);
1089 kfree_skb(skb);
1090out_put:
1091 dev_put(dev);
1092out:
1093 mutex_unlock(&po->pg_vec_lock);
1094 return err;
1095}
1096
1097static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
1098 size_t reserve, size_t len,
1099 size_t linear, int noblock,
1100 int *err)
1101{
1102 struct sk_buff *skb;
1103
1104 /* Under a page? Don't bother with paged skb. */
1105 if (prepad + len < PAGE_SIZE || !linear)
1106 linear = len;
1107
1108 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
1109 err);
1110 if (!skb)
1111 return NULL;
1112
1113 skb_reserve(skb, reserve);
1114 skb_put(skb, linear);
1115 skb->data_len = len - linear;
1116 skb->len += len - linear;
1117
1118 return skb;
1119}
1120
1121static int packet_snd(struct socket *sock,
1122 struct msghdr *msg, size_t len)
1123{
1124 struct sock *sk = sock->sk;
1125 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1126 struct sk_buff *skb;
1127 struct net_device *dev;
1128 __be16 proto;
1129 unsigned char *addr;
1130 int ifindex, err, reserve = 0;
1131 struct virtio_net_hdr vnet_hdr = { 0 };
1132 int offset = 0;
1133 int vnet_hdr_len;
1134 struct packet_sock *po = pkt_sk(sk);
1135 unsigned short gso_type = 0;
1136
1137 /*
1138 * Get and verify the address.
1139 */
1140
1141 if (saddr == NULL) {
1142 ifindex = po->ifindex;
1143 proto = po->num;
1144 addr = NULL;
1145 } else {
1146 err = -EINVAL;
1147 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1148 goto out;
1149 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1150 goto out;
1151 ifindex = saddr->sll_ifindex;
1152 proto = saddr->sll_protocol;
1153 addr = saddr->sll_addr;
1154 }
1155
1156
1157 dev = dev_get_by_index(sock_net(sk), ifindex);
1158 err = -ENXIO;
1159 if (dev == NULL)
1160 goto out_unlock;
1161 if (sock->type == SOCK_RAW)
1162 reserve = dev->hard_header_len;
1163
1164 err = -ENETDOWN;
1165 if (!(dev->flags & IFF_UP))
1166 goto out_unlock;
1167
1168 if (po->has_vnet_hdr) {
1169 vnet_hdr_len = sizeof(vnet_hdr);
1170
1171 err = -EINVAL;
1172 if (len < vnet_hdr_len)
1173 goto out_unlock;
1174
1175 len -= vnet_hdr_len;
1176
1177 err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
1178 vnet_hdr_len);
1179 if (err < 0)
1180 goto out_unlock;
1181
1182 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
1183 (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
1184 vnet_hdr.hdr_len))
1185 vnet_hdr.hdr_len = vnet_hdr.csum_start +
1186 vnet_hdr.csum_offset + 2;
1187
1188 err = -EINVAL;
1189 if (vnet_hdr.hdr_len > len)
1190 goto out_unlock;
1191
1192 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1193 switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1194 case VIRTIO_NET_HDR_GSO_TCPV4:
1195 gso_type = SKB_GSO_TCPV4;
1196 break;
1197 case VIRTIO_NET_HDR_GSO_TCPV6:
1198 gso_type = SKB_GSO_TCPV6;
1199 break;
1200 case VIRTIO_NET_HDR_GSO_UDP:
1201 gso_type = SKB_GSO_UDP;
1202 break;
1203 default:
1204 goto out_unlock;
1205 }
1206
1207 if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
1208 gso_type |= SKB_GSO_TCP_ECN;
1209
1210 if (vnet_hdr.gso_size == 0)
1211 goto out_unlock;
1212
1213 }
1214 }
1215
1216 err = -EMSGSIZE;
1217 if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
1218 goto out_unlock;
1219
1220 err = -ENOBUFS;
1221 skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
1222 LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
1223 msg->msg_flags & MSG_DONTWAIT, &err);
1224 if (skb == NULL)
1225 goto out_unlock;
1226
1227 skb_set_network_header(skb, reserve);
1228
1229 err = -EINVAL;
1230 if (sock->type == SOCK_DGRAM &&
1231 (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
1232 goto out_free;
1233
1234 /* Returns -EFAULT on error */
1235 err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
1236 if (err)
1237 goto out_free;
1238 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1239 if (err < 0)
1240 goto out_free;
1241
1242 if (!gso_type && (len > dev->mtu + reserve)) {
1243 /* Earlier code assumed this would be a VLAN pkt,
1244 * double-check this now that we have the actual
1245 * packet in hand.
1246 */
1247 struct ethhdr *ehdr;
1248 skb_reset_mac_header(skb);
1249 ehdr = eth_hdr(skb);
1250 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
1251 err = -EMSGSIZE;
1252 goto out_free;
1253 }
1254 }
1255
1256 skb->protocol = proto;
1257 skb->dev = dev;
1258 skb->priority = sk->sk_priority;
1259 skb->mark = sk->sk_mark;
1260
1261 if (po->has_vnet_hdr) {
1262 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1263 if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
1264 vnet_hdr.csum_offset)) {
1265 err = -EINVAL;
1266 goto out_free;
1267 }
1268 }
1269
1270 skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
1271 skb_shinfo(skb)->gso_type = gso_type;
1272
1273 /* Header must be checked, and gso_segs computed. */
1274 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
1275 skb_shinfo(skb)->gso_segs = 0;
1276
1277 len += vnet_hdr_len;
1278 }
1279
1280 /*
1281 * Now send it
1282 */
1283
1284 err = dev_queue_xmit(skb);
1285 if (err > 0 && (err = net_xmit_errno(err)) != 0)
1286 goto out_unlock;
1287
1288 dev_put(dev);
1289
1290 return len;
1291
1292out_free:
1293 kfree_skb(skb);
1294out_unlock:
1295 if (dev)
1296 dev_put(dev);
1297out:
1298 return err;
1299}
1300
1301static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1302 struct msghdr *msg, size_t len)
1303{
1304 struct sock *sk = sock->sk;
1305 struct packet_sock *po = pkt_sk(sk);
1306 if (po->tx_ring.pg_vec)
1307 return tpacket_snd(po, msg);
1308 else
1309 return packet_snd(sock, msg, len);
1310}
1311
1312/*
1313 * Close a PACKET socket. This is fairly simple. We immediately go
1314 * to 'closed' state and remove our protocol entry in the device list.
1315 */
1316
1317static int packet_release(struct socket *sock)
1318{
1319 struct sock *sk = sock->sk;
1320 struct packet_sock *po;
1321 struct net *net;
1322 struct tpacket_req req;
1323
1324 if (!sk)
1325 return 0;
1326
1327 net = sock_net(sk);
1328 po = pkt_sk(sk);
1329
1330 spin_lock_bh(&net->packet.sklist_lock);
1331 sk_del_node_init_rcu(sk);
1332 sock_prot_inuse_add(net, sk->sk_prot, -1);
1333 spin_unlock_bh(&net->packet.sklist_lock);
1334
1335 spin_lock(&po->bind_lock);
1336 if (po->running) {
1337 /*
1338 * Remove from protocol table
1339 */
1340 po->running = 0;
1341 po->num = 0;
1342 __dev_remove_pack(&po->prot_hook);
1343 __sock_put(sk);
1344 }
1345 spin_unlock(&po->bind_lock);
1346
1347 packet_flush_mclist(sk);
1348
1349 memset(&req, 0, sizeof(req));
1350
1351 if (po->rx_ring.pg_vec)
1352 packet_set_ring(sk, &req, 1, 0);
1353
1354 if (po->tx_ring.pg_vec)
1355 packet_set_ring(sk, &req, 1, 1);
1356
1357 synchronize_net();
1358 /*
1359 * Now the socket is dead. No more input will appear.
1360 */
1361 sock_orphan(sk);
1362 sock->sk = NULL;
1363
1364 /* Purge queues */
1365
1366 skb_queue_purge(&sk->sk_receive_queue);
1367 sk_refcnt_debug_release(sk);
1368
1369 sock_put(sk);
1370 return 0;
1371}
1372
1373/*
1374 * Attach a packet hook.
1375 */
1376
1377static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1378{
1379 struct packet_sock *po = pkt_sk(sk);
1380 /*
1381 * Detach an existing hook if present.
1382 */
1383
1384 lock_sock(sk);
1385
1386 spin_lock(&po->bind_lock);
1387 if (po->running) {
1388 __sock_put(sk);
1389 po->running = 0;
1390 po->num = 0;
1391 spin_unlock(&po->bind_lock);
1392 dev_remove_pack(&po->prot_hook);
1393 spin_lock(&po->bind_lock);
1394 }
1395
1396 po->num = protocol;
1397 po->prot_hook.type = protocol;
1398 po->prot_hook.dev = dev;
1399
1400 po->ifindex = dev ? dev->ifindex : 0;
1401
1402 if (protocol == 0)
1403 goto out_unlock;
1404
1405 if (!dev || (dev->flags & IFF_UP)) {
1406 dev_add_pack(&po->prot_hook);
1407 sock_hold(sk);
1408 po->running = 1;
1409 } else {
1410 sk->sk_err = ENETDOWN;
1411 if (!sock_flag(sk, SOCK_DEAD))
1412 sk->sk_error_report(sk);
1413 }
1414
1415out_unlock:
1416 spin_unlock(&po->bind_lock);
1417 release_sock(sk);
1418 return 0;
1419}
1420
1421/*
1422 * Bind a packet socket to a device
1423 */
1424
1425static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
1426 int addr_len)
1427{
1428 struct sock *sk = sock->sk;
1429 char name[15];
1430 struct net_device *dev;
1431 int err = -ENODEV;
1432
1433 /*
1434 * Check legality
1435 */
1436
1437 if (addr_len != sizeof(struct sockaddr))
1438 return -EINVAL;
1439 strlcpy(name, uaddr->sa_data, sizeof(name));
1440
1441 dev = dev_get_by_name(sock_net(sk), name);
1442 if (dev) {
1443 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1444 dev_put(dev);
1445 }
1446 return err;
1447}
1448
1449static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1450{
1451 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1452 struct sock *sk = sock->sk;
1453 struct net_device *dev = NULL;
1454 int err;
1455
1456
1457 /*
1458 * Check legality
1459 */
1460
1461 if (addr_len < sizeof(struct sockaddr_ll))
1462 return -EINVAL;
1463 if (sll->sll_family != AF_PACKET)
1464 return -EINVAL;
1465
1466 if (sll->sll_ifindex) {
1467 err = -ENODEV;
1468 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1469 if (dev == NULL)
1470 goto out;
1471 }
1472 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1473 if (dev)
1474 dev_put(dev);
1475
1476out:
1477 return err;
1478}
1479
1480static struct proto packet_proto = {
1481 .name = "PACKET",
1482 .owner = THIS_MODULE,
1483 .obj_size = sizeof(struct packet_sock),
1484};
1485
1486/*
1487 * Create a packet of type SOCK_PACKET.
1488 */
1489
1490static int packet_create(struct net *net, struct socket *sock, int protocol,
1491 int kern)
1492{
1493 struct sock *sk;
1494 struct packet_sock *po;
1495 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1496 int err;
1497
1498 if (!capable(CAP_NET_RAW))
1499 return -EPERM;
1500 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1501 sock->type != SOCK_PACKET)
1502 return -ESOCKTNOSUPPORT;
1503
1504 sock->state = SS_UNCONNECTED;
1505
1506 err = -ENOBUFS;
1507 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1508 if (sk == NULL)
1509 goto out;
1510
1511 sock->ops = &packet_ops;
1512 if (sock->type == SOCK_PACKET)
1513 sock->ops = &packet_ops_spkt;
1514
1515 sock_init_data(sock, sk);
1516
1517 po = pkt_sk(sk);
1518 sk->sk_family = PF_PACKET;
1519 po->num = proto;
1520
1521 sk->sk_destruct = packet_sock_destruct;
1522 sk_refcnt_debug_inc(sk);
1523
1524 /*
1525 * Attach a protocol block
1526 */
1527
1528 spin_lock_init(&po->bind_lock);
1529 mutex_init(&po->pg_vec_lock);
1530 po->prot_hook.func = packet_rcv;
1531
1532 if (sock->type == SOCK_PACKET)
1533 po->prot_hook.func = packet_rcv_spkt;
1534
1535 po->prot_hook.af_packet_priv = sk;
1536
1537 if (proto) {
1538 po->prot_hook.type = proto;
1539 dev_add_pack(&po->prot_hook);
1540 sock_hold(sk);
1541 po->running = 1;
1542 }
1543
1544 spin_lock_bh(&net->packet.sklist_lock);
1545 sk_add_node_rcu(sk, &net->packet.sklist);
1546 sock_prot_inuse_add(net, &packet_proto, 1);
1547 spin_unlock_bh(&net->packet.sklist_lock);
1548
1549 return 0;
1550out:
1551 return err;
1552}
1553
1554static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
1555{
1556 struct sock_exterr_skb *serr;
1557 struct sk_buff *skb, *skb2;
1558 int copied, err;
1559
1560 err = -EAGAIN;
1561 skb = skb_dequeue(&sk->sk_error_queue);
1562 if (skb == NULL)
1563 goto out;
1564
1565 copied = skb->len;
1566 if (copied > len) {
1567 msg->msg_flags |= MSG_TRUNC;
1568 copied = len;
1569 }
1570 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1571 if (err)
1572 goto out_free_skb;
1573
1574 sock_recv_timestamp(msg, sk, skb);
1575
1576 serr = SKB_EXT_ERR(skb);
1577 put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
1578 sizeof(serr->ee), &serr->ee);
1579
1580 msg->msg_flags |= MSG_ERRQUEUE;
1581 err = copied;
1582
1583 /* Reset and regenerate socket error */
1584 spin_lock_bh(&sk->sk_error_queue.lock);
1585 sk->sk_err = 0;
1586 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
1587 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
1588 spin_unlock_bh(&sk->sk_error_queue.lock);
1589 sk->sk_error_report(sk);
1590 } else
1591 spin_unlock_bh(&sk->sk_error_queue.lock);
1592
1593out_free_skb:
1594 kfree_skb(skb);
1595out:
1596 return err;
1597}
1598
1599/*
1600 * Pull a packet from our receive queue and hand it to the user.
1601 * If necessary we block.
1602 */
1603
1604static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1605 struct msghdr *msg, size_t len, int flags)
1606{
1607 struct sock *sk = sock->sk;
1608 struct sk_buff *skb;
1609 int copied, err;
1610 struct sockaddr_ll *sll;
1611 int vnet_hdr_len = 0;
1612
1613 err = -EINVAL;
1614 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
1615 goto out;
1616
1617#if 0
1618 /* What error should we return now? EUNATTACH? */
1619 if (pkt_sk(sk)->ifindex < 0)
1620 return -ENODEV;
1621#endif
1622
1623 if (flags & MSG_ERRQUEUE) {
1624 err = packet_recv_error(sk, msg, len);
1625 goto out;
1626 }
1627
1628 /*
1629 * Call the generic datagram receiver. This handles all sorts
1630 * of horrible races and re-entrancy so we can forget about it
1631 * in the protocol layers.
1632 *
1633 * Now it will return ENETDOWN, if device have just gone down,
1634 * but then it will block.
1635 */
1636
1637 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1638
1639 /*
1640 * An error occurred so return it. Because skb_recv_datagram()
1641 * handles the blocking we don't see and worry about blocking
1642 * retries.
1643 */
1644
1645 if (skb == NULL)
1646 goto out;
1647
1648 if (pkt_sk(sk)->has_vnet_hdr) {
1649 struct virtio_net_hdr vnet_hdr = { 0 };
1650
1651 err = -EINVAL;
1652 vnet_hdr_len = sizeof(vnet_hdr);
1653 if (len < vnet_hdr_len)
1654 goto out_free;
1655
1656 len -= vnet_hdr_len;
1657
1658 if (skb_is_gso(skb)) {
1659 struct skb_shared_info *sinfo = skb_shinfo(skb);
1660
1661 /* This is a hint as to how much should be linear. */
1662 vnet_hdr.hdr_len = skb_headlen(skb);
1663 vnet_hdr.gso_size = sinfo->gso_size;
1664 if (sinfo->gso_type & SKB_GSO_TCPV4)
1665 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
1666 else if (sinfo->gso_type & SKB_GSO_TCPV6)
1667 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
1668 else if (sinfo->gso_type & SKB_GSO_UDP)
1669 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
1670 else if (sinfo->gso_type & SKB_GSO_FCOE)
1671 goto out_free;
1672 else
1673 BUG();
1674 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
1675 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
1676 } else
1677 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
1678
1679 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1680 vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
1681 vnet_hdr.csum_start = skb_checksum_start_offset(skb);
1682 vnet_hdr.csum_offset = skb->csum_offset;
1683 } /* else everything is zero */
1684
1685 err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
1686 vnet_hdr_len);
1687 if (err < 0)
1688 goto out_free;
1689 }
1690
1691 /*
1692 * If the address length field is there to be filled in, we fill
1693 * it in now.
1694 */
1695
1696 sll = &PACKET_SKB_CB(skb)->sa.ll;
1697 if (sock->type == SOCK_PACKET)
1698 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1699 else
1700 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1701
1702 /*
1703 * You lose any data beyond the buffer you gave. If it worries a
1704 * user program they can ask the device for its MTU anyway.
1705 */
1706
1707 copied = skb->len;
1708 if (copied > len) {
1709 copied = len;
1710 msg->msg_flags |= MSG_TRUNC;
1711 }
1712
1713 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1714 if (err)
1715 goto out_free;
1716
1717 sock_recv_ts_and_drops(msg, sk, skb);
1718
1719 if (msg->msg_name)
1720 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1721 msg->msg_namelen);
1722
1723 if (pkt_sk(sk)->auxdata) {
1724 struct tpacket_auxdata aux;
1725
1726 aux.tp_status = TP_STATUS_USER;
1727 if (skb->ip_summed == CHECKSUM_PARTIAL)
1728 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1729 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1730 aux.tp_snaplen = skb->len;
1731 aux.tp_mac = 0;
1732 aux.tp_net = skb_network_offset(skb);
1733 if (vlan_tx_tag_present(skb)) {
1734 aux.tp_vlan_tci = vlan_tx_tag_get(skb);
1735 aux.tp_status |= TP_STATUS_VLAN_VALID;
1736 } else {
1737 aux.tp_vlan_tci = 0;
1738 }
1739 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1740 }
1741
1742 /*
1743 * Free or return the buffer as appropriate. Again this
1744 * hides all the races and re-entrancy issues from us.
1745 */
1746 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
1747
1748out_free:
1749 skb_free_datagram(sk, skb);
1750out:
1751 return err;
1752}
1753
1754static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1755 int *uaddr_len, int peer)
1756{
1757 struct net_device *dev;
1758 struct sock *sk = sock->sk;
1759
1760 if (peer)
1761 return -EOPNOTSUPP;
1762
1763 uaddr->sa_family = AF_PACKET;
1764 rcu_read_lock();
1765 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
1766 if (dev)
1767 strncpy(uaddr->sa_data, dev->name, 14);
1768 else
1769 memset(uaddr->sa_data, 0, 14);
1770 rcu_read_unlock();
1771 *uaddr_len = sizeof(*uaddr);
1772
1773 return 0;
1774}
1775
1776static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1777 int *uaddr_len, int peer)
1778{
1779 struct net_device *dev;
1780 struct sock *sk = sock->sk;
1781 struct packet_sock *po = pkt_sk(sk);
1782 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
1783
1784 if (peer)
1785 return -EOPNOTSUPP;
1786
1787 sll->sll_family = AF_PACKET;
1788 sll->sll_ifindex = po->ifindex;
1789 sll->sll_protocol = po->num;
1790 sll->sll_pkttype = 0;
1791 rcu_read_lock();
1792 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
1793 if (dev) {
1794 sll->sll_hatype = dev->type;
1795 sll->sll_halen = dev->addr_len;
1796 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1797 } else {
1798 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1799 sll->sll_halen = 0;
1800 }
1801 rcu_read_unlock();
1802 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1803
1804 return 0;
1805}
1806
1807static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1808 int what)
1809{
1810 switch (i->type) {
1811 case PACKET_MR_MULTICAST:
1812 if (i->alen != dev->addr_len)
1813 return -EINVAL;
1814 if (what > 0)
1815 return dev_mc_add(dev, i->addr);
1816 else
1817 return dev_mc_del(dev, i->addr);
1818 break;
1819 case PACKET_MR_PROMISC:
1820 return dev_set_promiscuity(dev, what);
1821 break;
1822 case PACKET_MR_ALLMULTI:
1823 return dev_set_allmulti(dev, what);
1824 break;
1825 case PACKET_MR_UNICAST:
1826 if (i->alen != dev->addr_len)
1827 return -EINVAL;
1828 if (what > 0)
1829 return dev_uc_add(dev, i->addr);
1830 else
1831 return dev_uc_del(dev, i->addr);
1832 break;
1833 default:
1834 break;
1835 }
1836 return 0;
1837}
1838
1839static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1840{
1841 for ( ; i; i = i->next) {
1842 if (i->ifindex == dev->ifindex)
1843 packet_dev_mc(dev, i, what);
1844 }
1845}
1846
1847static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1848{
1849 struct packet_sock *po = pkt_sk(sk);
1850 struct packet_mclist *ml, *i;
1851 struct net_device *dev;
1852 int err;
1853
1854 rtnl_lock();
1855
1856 err = -ENODEV;
1857 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1858 if (!dev)
1859 goto done;
1860
1861 err = -EINVAL;
1862 if (mreq->mr_alen > dev->addr_len)
1863 goto done;
1864
1865 err = -ENOBUFS;
1866 i = kmalloc(sizeof(*i), GFP_KERNEL);
1867 if (i == NULL)
1868 goto done;
1869
1870 err = 0;
1871 for (ml = po->mclist; ml; ml = ml->next) {
1872 if (ml->ifindex == mreq->mr_ifindex &&
1873 ml->type == mreq->mr_type &&
1874 ml->alen == mreq->mr_alen &&
1875 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1876 ml->count++;
1877 /* Free the new element ... */
1878 kfree(i);
1879 goto done;
1880 }
1881 }
1882
1883 i->type = mreq->mr_type;
1884 i->ifindex = mreq->mr_ifindex;
1885 i->alen = mreq->mr_alen;
1886 memcpy(i->addr, mreq->mr_address, i->alen);
1887 i->count = 1;
1888 i->next = po->mclist;
1889 po->mclist = i;
1890 err = packet_dev_mc(dev, i, 1);
1891 if (err) {
1892 po->mclist = i->next;
1893 kfree(i);
1894 }
1895
1896done:
1897 rtnl_unlock();
1898 return err;
1899}
1900
1901static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1902{
1903 struct packet_mclist *ml, **mlp;
1904
1905 rtnl_lock();
1906
1907 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1908 if (ml->ifindex == mreq->mr_ifindex &&
1909 ml->type == mreq->mr_type &&
1910 ml->alen == mreq->mr_alen &&
1911 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1912 if (--ml->count == 0) {
1913 struct net_device *dev;
1914 *mlp = ml->next;
1915 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1916 if (dev)
1917 packet_dev_mc(dev, ml, -1);
1918 kfree(ml);
1919 }
1920 rtnl_unlock();
1921 return 0;
1922 }
1923 }
1924 rtnl_unlock();
1925 return -EADDRNOTAVAIL;
1926}
1927
1928static void packet_flush_mclist(struct sock *sk)
1929{
1930 struct packet_sock *po = pkt_sk(sk);
1931 struct packet_mclist *ml;
1932
1933 if (!po->mclist)
1934 return;
1935
1936 rtnl_lock();
1937 while ((ml = po->mclist) != NULL) {
1938 struct net_device *dev;
1939
1940 po->mclist = ml->next;
1941 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1942 if (dev != NULL)
1943 packet_dev_mc(dev, ml, -1);
1944 kfree(ml);
1945 }
1946 rtnl_unlock();
1947}
1948
1949static int
1950packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1951{
1952 struct sock *sk = sock->sk;
1953 struct packet_sock *po = pkt_sk(sk);
1954 int ret;
1955
1956 if (level != SOL_PACKET)
1957 return -ENOPROTOOPT;
1958
1959 switch (optname) {
1960 case PACKET_ADD_MEMBERSHIP:
1961 case PACKET_DROP_MEMBERSHIP:
1962 {
1963 struct packet_mreq_max mreq;
1964 int len = optlen;
1965 memset(&mreq, 0, sizeof(mreq));
1966 if (len < sizeof(struct packet_mreq))
1967 return -EINVAL;
1968 if (len > sizeof(mreq))
1969 len = sizeof(mreq);
1970 if (copy_from_user(&mreq, optval, len))
1971 return -EFAULT;
1972 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1973 return -EINVAL;
1974 if (optname == PACKET_ADD_MEMBERSHIP)
1975 ret = packet_mc_add(sk, &mreq);
1976 else
1977 ret = packet_mc_drop(sk, &mreq);
1978 return ret;
1979 }
1980
1981 case PACKET_RX_RING:
1982 case PACKET_TX_RING:
1983 {
1984 struct tpacket_req req;
1985
1986 if (optlen < sizeof(req))
1987 return -EINVAL;
1988 if (pkt_sk(sk)->has_vnet_hdr)
1989 return -EINVAL;
1990 if (copy_from_user(&req, optval, sizeof(req)))
1991 return -EFAULT;
1992 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
1993 }
1994 case PACKET_COPY_THRESH:
1995 {
1996 int val;
1997
1998 if (optlen != sizeof(val))
1999 return -EINVAL;
2000 if (copy_from_user(&val, optval, sizeof(val)))
2001 return -EFAULT;
2002
2003 pkt_sk(sk)->copy_thresh = val;
2004 return 0;
2005 }
2006 case PACKET_VERSION:
2007 {
2008 int val;
2009
2010 if (optlen != sizeof(val))
2011 return -EINVAL;
2012 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2013 return -EBUSY;
2014 if (copy_from_user(&val, optval, sizeof(val)))
2015 return -EFAULT;
2016 switch (val) {
2017 case TPACKET_V1:
2018 case TPACKET_V2:
2019 po->tp_version = val;
2020 return 0;
2021 default:
2022 return -EINVAL;
2023 }
2024 }
2025 case PACKET_RESERVE:
2026 {
2027 unsigned int val;
2028
2029 if (optlen != sizeof(val))
2030 return -EINVAL;
2031 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2032 return -EBUSY;
2033 if (copy_from_user(&val, optval, sizeof(val)))
2034 return -EFAULT;
2035 po->tp_reserve = val;
2036 return 0;
2037 }
2038 case PACKET_LOSS:
2039 {
2040 unsigned int val;
2041
2042 if (optlen != sizeof(val))
2043 return -EINVAL;
2044 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2045 return -EBUSY;
2046 if (copy_from_user(&val, optval, sizeof(val)))
2047 return -EFAULT;
2048 po->tp_loss = !!val;
2049 return 0;
2050 }
2051 case PACKET_AUXDATA:
2052 {
2053 int val;
2054
2055 if (optlen < sizeof(val))
2056 return -EINVAL;
2057 if (copy_from_user(&val, optval, sizeof(val)))
2058 return -EFAULT;
2059
2060 po->auxdata = !!val;
2061 return 0;
2062 }
2063 case PACKET_ORIGDEV:
2064 {
2065 int val;
2066
2067 if (optlen < sizeof(val))
2068 return -EINVAL;
2069 if (copy_from_user(&val, optval, sizeof(val)))
2070 return -EFAULT;
2071
2072 po->origdev = !!val;
2073 return 0;
2074 }
2075 case PACKET_VNET_HDR:
2076 {
2077 int val;
2078
2079 if (sock->type != SOCK_RAW)
2080 return -EINVAL;
2081 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2082 return -EBUSY;
2083 if (optlen < sizeof(val))
2084 return -EINVAL;
2085 if (copy_from_user(&val, optval, sizeof(val)))
2086 return -EFAULT;
2087
2088 po->has_vnet_hdr = !!val;
2089 return 0;
2090 }
2091 case PACKET_TIMESTAMP:
2092 {
2093 int val;
2094
2095 if (optlen != sizeof(val))
2096 return -EINVAL;
2097 if (copy_from_user(&val, optval, sizeof(val)))
2098 return -EFAULT;
2099
2100 po->tp_tstamp = val;
2101 return 0;
2102 }
2103 default:
2104 return -ENOPROTOOPT;
2105 }
2106}
2107
2108static int packet_getsockopt(struct socket *sock, int level, int optname,
2109 char __user *optval, int __user *optlen)
2110{
2111 int len;
2112 int val;
2113 struct sock *sk = sock->sk;
2114 struct packet_sock *po = pkt_sk(sk);
2115 void *data;
2116 struct tpacket_stats st;
2117
2118 if (level != SOL_PACKET)
2119 return -ENOPROTOOPT;
2120
2121 if (get_user(len, optlen))
2122 return -EFAULT;
2123
2124 if (len < 0)
2125 return -EINVAL;
2126
2127 switch (optname) {
2128 case PACKET_STATISTICS:
2129 if (len > sizeof(struct tpacket_stats))
2130 len = sizeof(struct tpacket_stats);
2131 spin_lock_bh(&sk->sk_receive_queue.lock);
2132 st = po->stats;
2133 memset(&po->stats, 0, sizeof(st));
2134 spin_unlock_bh(&sk->sk_receive_queue.lock);
2135 st.tp_packets += st.tp_drops;
2136
2137 data = &st;
2138 break;
2139 case PACKET_AUXDATA:
2140 if (len > sizeof(int))
2141 len = sizeof(int);
2142 val = po->auxdata;
2143
2144 data = &val;
2145 break;
2146 case PACKET_ORIGDEV:
2147 if (len > sizeof(int))
2148 len = sizeof(int);
2149 val = po->origdev;
2150
2151 data = &val;
2152 break;
2153 case PACKET_VNET_HDR:
2154 if (len > sizeof(int))
2155 len = sizeof(int);
2156 val = po->has_vnet_hdr;
2157
2158 data = &val;
2159 break;
2160 case PACKET_VERSION:
2161 if (len > sizeof(int))
2162 len = sizeof(int);
2163 val = po->tp_version;
2164 data = &val;
2165 break;
2166 case PACKET_HDRLEN:
2167 if (len > sizeof(int))
2168 len = sizeof(int);
2169 if (copy_from_user(&val, optval, len))
2170 return -EFAULT;
2171 switch (val) {
2172 case TPACKET_V1:
2173 val = sizeof(struct tpacket_hdr);
2174 break;
2175 case TPACKET_V2:
2176 val = sizeof(struct tpacket2_hdr);
2177 break;
2178 default:
2179 return -EINVAL;
2180 }
2181 data = &val;
2182 break;
2183 case PACKET_RESERVE:
2184 if (len > sizeof(unsigned int))
2185 len = sizeof(unsigned int);
2186 val = po->tp_reserve;
2187 data = &val;
2188 break;
2189 case PACKET_LOSS:
2190 if (len > sizeof(unsigned int))
2191 len = sizeof(unsigned int);
2192 val = po->tp_loss;
2193 data = &val;
2194 break;
2195 case PACKET_TIMESTAMP:
2196 if (len > sizeof(int))
2197 len = sizeof(int);
2198 val = po->tp_tstamp;
2199 data = &val;
2200 break;
2201 default:
2202 return -ENOPROTOOPT;
2203 }
2204
2205 if (put_user(len, optlen))
2206 return -EFAULT;
2207 if (copy_to_user(optval, data, len))
2208 return -EFAULT;
2209 return 0;
2210}
2211
2212
2213static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
2214{
2215 struct sock *sk;
2216 struct hlist_node *node;
2217 struct net_device *dev = data;
2218 struct net *net = dev_net(dev);
2219
2220 rcu_read_lock();
2221 sk_for_each_rcu(sk, node, &net->packet.sklist) {
2222 struct packet_sock *po = pkt_sk(sk);
2223
2224 switch (msg) {
2225 case NETDEV_UNREGISTER:
2226 if (po->mclist)
2227 packet_dev_mclist(dev, po->mclist, -1);
2228 /* fallthrough */
2229
2230 case NETDEV_DOWN:
2231 if (dev->ifindex == po->ifindex) {
2232 spin_lock(&po->bind_lock);
2233 if (po->running) {
2234 __dev_remove_pack(&po->prot_hook);
2235 __sock_put(sk);
2236 po->running = 0;
2237 sk->sk_err = ENETDOWN;
2238 if (!sock_flag(sk, SOCK_DEAD))
2239 sk->sk_error_report(sk);
2240 }
2241 if (msg == NETDEV_UNREGISTER) {
2242 po->ifindex = -1;
2243 po->prot_hook.dev = NULL;
2244 }
2245 spin_unlock(&po->bind_lock);
2246 }
2247 break;
2248 case NETDEV_UP:
2249 if (dev->ifindex == po->ifindex) {
2250 spin_lock(&po->bind_lock);
2251 if (po->num && !po->running) {
2252 dev_add_pack(&po->prot_hook);
2253 sock_hold(sk);
2254 po->running = 1;
2255 }
2256 spin_unlock(&po->bind_lock);
2257 }
2258 break;
2259 }
2260 }
2261 rcu_read_unlock();
2262 return NOTIFY_DONE;
2263}
2264
2265
2266static int packet_ioctl(struct socket *sock, unsigned int cmd,
2267 unsigned long arg)
2268{
2269 struct sock *sk = sock->sk;
2270
2271 switch (cmd) {
2272 case SIOCOUTQ:
2273 {
2274 int amount = sk_wmem_alloc_get(sk);
2275
2276 return put_user(amount, (int __user *)arg);
2277 }
2278 case SIOCINQ:
2279 {
2280 struct sk_buff *skb;
2281 int amount = 0;
2282
2283 spin_lock_bh(&sk->sk_receive_queue.lock);
2284 skb = skb_peek(&sk->sk_receive_queue);
2285 if (skb)
2286 amount = skb->len;
2287 spin_unlock_bh(&sk->sk_receive_queue.lock);
2288 return put_user(amount, (int __user *)arg);
2289 }
2290 case SIOCGSTAMP:
2291 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2292 case SIOCGSTAMPNS:
2293 return sock_get_timestampns(sk, (struct timespec __user *)arg);
2294
2295#ifdef CONFIG_INET
2296 case SIOCADDRT:
2297 case SIOCDELRT:
2298 case SIOCDARP:
2299 case SIOCGARP:
2300 case SIOCSARP:
2301 case SIOCGIFADDR:
2302 case SIOCSIFADDR:
2303 case SIOCGIFBRDADDR:
2304 case SIOCSIFBRDADDR:
2305 case SIOCGIFNETMASK:
2306 case SIOCSIFNETMASK:
2307 case SIOCGIFDSTADDR:
2308 case SIOCSIFDSTADDR:
2309 case SIOCSIFFLAGS:
2310 return inet_dgram_ops.ioctl(sock, cmd, arg);
2311#endif
2312
2313 default:
2314 return -ENOIOCTLCMD;
2315 }
2316 return 0;
2317}
2318
2319static unsigned int packet_poll(struct file *file, struct socket *sock,
2320 poll_table *wait)
2321{
2322 struct sock *sk = sock->sk;
2323 struct packet_sock *po = pkt_sk(sk);
2324 unsigned int mask = datagram_poll(file, sock, wait);
2325
2326 spin_lock_bh(&sk->sk_receive_queue.lock);
2327 if (po->rx_ring.pg_vec) {
2328 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
2329 mask |= POLLIN | POLLRDNORM;
2330 }
2331 spin_unlock_bh(&sk->sk_receive_queue.lock);
2332 spin_lock_bh(&sk->sk_write_queue.lock);
2333 if (po->tx_ring.pg_vec) {
2334 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2335 mask |= POLLOUT | POLLWRNORM;
2336 }
2337 spin_unlock_bh(&sk->sk_write_queue.lock);
2338 return mask;
2339}
2340
2341
2342/* Dirty? Well, I still did not learn better way to account
2343 * for user mmaps.
2344 */
2345
2346static void packet_mm_open(struct vm_area_struct *vma)
2347{
2348 struct file *file = vma->vm_file;
2349 struct socket *sock = file->private_data;
2350 struct sock *sk = sock->sk;
2351
2352 if (sk)
2353 atomic_inc(&pkt_sk(sk)->mapped);
2354}
2355
2356static void packet_mm_close(struct vm_area_struct *vma)
2357{
2358 struct file *file = vma->vm_file;
2359 struct socket *sock = file->private_data;
2360 struct sock *sk = sock->sk;
2361
2362 if (sk)
2363 atomic_dec(&pkt_sk(sk)->mapped);
2364}
2365
2366static const struct vm_operations_struct packet_mmap_ops = {
2367 .open = packet_mm_open,
2368 .close = packet_mm_close,
2369};
2370
2371static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
2372 unsigned int len)
2373{
2374 int i;
2375
2376 for (i = 0; i < len; i++) {
2377 if (likely(pg_vec[i].buffer)) {
2378 if (is_vmalloc_addr(pg_vec[i].buffer))
2379 vfree(pg_vec[i].buffer);
2380 else
2381 free_pages((unsigned long)pg_vec[i].buffer,
2382 order);
2383 pg_vec[i].buffer = NULL;
2384 }
2385 }
2386 kfree(pg_vec);
2387}
2388
2389static inline char *alloc_one_pg_vec_page(unsigned long order)
2390{
2391 char *buffer = NULL;
2392 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
2393 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
2394
2395 buffer = (char *) __get_free_pages(gfp_flags, order);
2396
2397 if (buffer)
2398 return buffer;
2399
2400 /*
2401 * __get_free_pages failed, fall back to vmalloc
2402 */
2403 buffer = vzalloc((1 << order) * PAGE_SIZE);
2404
2405 if (buffer)
2406 return buffer;
2407
2408 /*
2409 * vmalloc failed, lets dig into swap here
2410 */
2411 gfp_flags &= ~__GFP_NORETRY;
2412 buffer = (char *)__get_free_pages(gfp_flags, order);
2413 if (buffer)
2414 return buffer;
2415
2416 /*
2417 * complete and utter failure
2418 */
2419 return NULL;
2420}
2421
2422static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
2423{
2424 unsigned int block_nr = req->tp_block_nr;
2425 struct pgv *pg_vec;
2426 int i;
2427
2428 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
2429 if (unlikely(!pg_vec))
2430 goto out;
2431
2432 for (i = 0; i < block_nr; i++) {
2433 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
2434 if (unlikely(!pg_vec[i].buffer))
2435 goto out_free_pgvec;
2436 }
2437
2438out:
2439 return pg_vec;
2440
2441out_free_pgvec:
2442 free_pg_vec(pg_vec, order, block_nr);
2443 pg_vec = NULL;
2444 goto out;
2445}
2446
2447static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2448 int closing, int tx_ring)
2449{
2450 struct pgv *pg_vec = NULL;
2451 struct packet_sock *po = pkt_sk(sk);
2452 int was_running, order = 0;
2453 struct packet_ring_buffer *rb;
2454 struct sk_buff_head *rb_queue;
2455 __be16 num;
2456 int err;
2457
2458 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2459 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2460
2461 err = -EBUSY;
2462 if (!closing) {
2463 if (atomic_read(&po->mapped))
2464 goto out;
2465 if (atomic_read(&rb->pending))
2466 goto out;
2467 }
2468
2469 if (req->tp_block_nr) {
2470 /* Sanity tests and some calculations */
2471 err = -EBUSY;
2472 if (unlikely(rb->pg_vec))
2473 goto out;
2474
2475 switch (po->tp_version) {
2476 case TPACKET_V1:
2477 po->tp_hdrlen = TPACKET_HDRLEN;
2478 break;
2479 case TPACKET_V2:
2480 po->tp_hdrlen = TPACKET2_HDRLEN;
2481 break;
2482 }
2483
2484 err = -EINVAL;
2485 if (unlikely((int)req->tp_block_size <= 0))
2486 goto out;
2487 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
2488 goto out;
2489 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
2490 po->tp_reserve))
2491 goto out;
2492 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
2493 goto out;
2494
2495 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2496 if (unlikely(rb->frames_per_block <= 0))
2497 goto out;
2498 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2499 req->tp_frame_nr))
2500 goto out;
2501
2502 err = -ENOMEM;
2503 order = get_order(req->tp_block_size);
2504 pg_vec = alloc_pg_vec(req, order);
2505 if (unlikely(!pg_vec))
2506 goto out;
2507 }
2508 /* Done */
2509 else {
2510 err = -EINVAL;
2511 if (unlikely(req->tp_frame_nr))
2512 goto out;
2513 }
2514
2515 lock_sock(sk);
2516
2517 /* Detach socket from network */
2518 spin_lock(&po->bind_lock);
2519 was_running = po->running;
2520 num = po->num;
2521 if (was_running) {
2522 __dev_remove_pack(&po->prot_hook);
2523 po->num = 0;
2524 po->running = 0;
2525 __sock_put(sk);
2526 }
2527 spin_unlock(&po->bind_lock);
2528
2529 synchronize_net();
2530
2531 err = -EBUSY;
2532 mutex_lock(&po->pg_vec_lock);
2533 if (closing || atomic_read(&po->mapped) == 0) {
2534 err = 0;
2535 spin_lock_bh(&rb_queue->lock);
2536 swap(rb->pg_vec, pg_vec);
2537 rb->frame_max = (req->tp_frame_nr - 1);
2538 rb->head = 0;
2539 rb->frame_size = req->tp_frame_size;
2540 spin_unlock_bh(&rb_queue->lock);
2541
2542 swap(rb->pg_vec_order, order);
2543 swap(rb->pg_vec_len, req->tp_block_nr);
2544
2545 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2546 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2547 tpacket_rcv : packet_rcv;
2548 skb_queue_purge(rb_queue);
2549 if (atomic_read(&po->mapped))
2550 pr_err("packet_mmap: vma is busy: %d\n",
2551 atomic_read(&po->mapped));
2552 }
2553 mutex_unlock(&po->pg_vec_lock);
2554
2555 spin_lock(&po->bind_lock);
2556 if (was_running && !po->running) {
2557 sock_hold(sk);
2558 po->running = 1;
2559 po->num = num;
2560 dev_add_pack(&po->prot_hook);
2561 }
2562 spin_unlock(&po->bind_lock);
2563
2564 release_sock(sk);
2565
2566 if (pg_vec)
2567 free_pg_vec(pg_vec, order, req->tp_block_nr);
2568out:
2569 return err;
2570}
2571
2572static int packet_mmap(struct file *file, struct socket *sock,
2573 struct vm_area_struct *vma)
2574{
2575 struct sock *sk = sock->sk;
2576 struct packet_sock *po = pkt_sk(sk);
2577 unsigned long size, expected_size;
2578 struct packet_ring_buffer *rb;
2579 unsigned long start;
2580 int err = -EINVAL;
2581 int i;
2582
2583 if (vma->vm_pgoff)
2584 return -EINVAL;
2585
2586 mutex_lock(&po->pg_vec_lock);
2587
2588 expected_size = 0;
2589 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2590 if (rb->pg_vec) {
2591 expected_size += rb->pg_vec_len
2592 * rb->pg_vec_pages
2593 * PAGE_SIZE;
2594 }
2595 }
2596
2597 if (expected_size == 0)
2598 goto out;
2599
2600 size = vma->vm_end - vma->vm_start;
2601 if (size != expected_size)
2602 goto out;
2603
2604 start = vma->vm_start;
2605 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2606 if (rb->pg_vec == NULL)
2607 continue;
2608
2609 for (i = 0; i < rb->pg_vec_len; i++) {
2610 struct page *page;
2611 void *kaddr = rb->pg_vec[i].buffer;
2612 int pg_num;
2613
2614 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
2615 page = pgv_to_page(kaddr);
2616 err = vm_insert_page(vma, start, page);
2617 if (unlikely(err))
2618 goto out;
2619 start += PAGE_SIZE;
2620 kaddr += PAGE_SIZE;
2621 }
2622 }
2623 }
2624
2625 atomic_inc(&po->mapped);
2626 vma->vm_ops = &packet_mmap_ops;
2627 err = 0;
2628
2629out:
2630 mutex_unlock(&po->pg_vec_lock);
2631 return err;
2632}
2633
2634static const struct proto_ops packet_ops_spkt = {
2635 .family = PF_PACKET,
2636 .owner = THIS_MODULE,
2637 .release = packet_release,
2638 .bind = packet_bind_spkt,
2639 .connect = sock_no_connect,
2640 .socketpair = sock_no_socketpair,
2641 .accept = sock_no_accept,
2642 .getname = packet_getname_spkt,
2643 .poll = datagram_poll,
2644 .ioctl = packet_ioctl,
2645 .listen = sock_no_listen,
2646 .shutdown = sock_no_shutdown,
2647 .setsockopt = sock_no_setsockopt,
2648 .getsockopt = sock_no_getsockopt,
2649 .sendmsg = packet_sendmsg_spkt,
2650 .recvmsg = packet_recvmsg,
2651 .mmap = sock_no_mmap,
2652 .sendpage = sock_no_sendpage,
2653};
2654
2655static const struct proto_ops packet_ops = {
2656 .family = PF_PACKET,
2657 .owner = THIS_MODULE,
2658 .release = packet_release,
2659 .bind = packet_bind,
2660 .connect = sock_no_connect,
2661 .socketpair = sock_no_socketpair,
2662 .accept = sock_no_accept,
2663 .getname = packet_getname,
2664 .poll = packet_poll,
2665 .ioctl = packet_ioctl,
2666 .listen = sock_no_listen,
2667 .shutdown = sock_no_shutdown,
2668 .setsockopt = packet_setsockopt,
2669 .getsockopt = packet_getsockopt,
2670 .sendmsg = packet_sendmsg,
2671 .recvmsg = packet_recvmsg,
2672 .mmap = packet_mmap,
2673 .sendpage = sock_no_sendpage,
2674};
2675
2676static const struct net_proto_family packet_family_ops = {
2677 .family = PF_PACKET,
2678 .create = packet_create,
2679 .owner = THIS_MODULE,
2680};
2681
2682static struct notifier_block packet_netdev_notifier = {
2683 .notifier_call = packet_notifier,
2684};
2685
2686#ifdef CONFIG_PROC_FS
2687
2688static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2689 __acquires(RCU)
2690{
2691 struct net *net = seq_file_net(seq);
2692
2693 rcu_read_lock();
2694 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
2695}
2696
2697static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2698{
2699 struct net *net = seq_file_net(seq);
2700 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
2701}
2702
2703static void packet_seq_stop(struct seq_file *seq, void *v)
2704 __releases(RCU)
2705{
2706 rcu_read_unlock();
2707}
2708
2709static int packet_seq_show(struct seq_file *seq, void *v)
2710{
2711 if (v == SEQ_START_TOKEN)
2712 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2713 else {
2714 struct sock *s = sk_entry(v);
2715 const struct packet_sock *po = pkt_sk(s);
2716
2717 seq_printf(seq,
2718 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2719 s,
2720 atomic_read(&s->sk_refcnt),
2721 s->sk_type,
2722 ntohs(po->num),
2723 po->ifindex,
2724 po->running,
2725 atomic_read(&s->sk_rmem_alloc),
2726 sock_i_uid(s),
2727 sock_i_ino(s));
2728 }
2729
2730 return 0;
2731}
2732
2733static const struct seq_operations packet_seq_ops = {
2734 .start = packet_seq_start,
2735 .next = packet_seq_next,
2736 .stop = packet_seq_stop,
2737 .show = packet_seq_show,
2738};
2739
2740static int packet_seq_open(struct inode *inode, struct file *file)
2741{
2742 return seq_open_net(inode, file, &packet_seq_ops,
2743 sizeof(struct seq_net_private));
2744}
2745
2746static const struct file_operations packet_seq_fops = {
2747 .owner = THIS_MODULE,
2748 .open = packet_seq_open,
2749 .read = seq_read,
2750 .llseek = seq_lseek,
2751 .release = seq_release_net,
2752};
2753
2754#endif
2755
2756static int __net_init packet_net_init(struct net *net)
2757{
2758 spin_lock_init(&net->packet.sklist_lock);
2759 INIT_HLIST_HEAD(&net->packet.sklist);
2760
2761 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2762 return -ENOMEM;
2763
2764 return 0;
2765}
2766
2767static void __net_exit packet_net_exit(struct net *net)
2768{
2769 proc_net_remove(net, "packet");
2770}
2771
2772static struct pernet_operations packet_net_ops = {
2773 .init = packet_net_init,
2774 .exit = packet_net_exit,
2775};
2776
2777
2778static void __exit packet_exit(void)
2779{
2780 unregister_netdevice_notifier(&packet_netdev_notifier);
2781 unregister_pernet_subsys(&packet_net_ops);
2782 sock_unregister(PF_PACKET);
2783 proto_unregister(&packet_proto);
2784}
2785
2786static int __init packet_init(void)
2787{
2788 int rc = proto_register(&packet_proto, 0);
2789
2790 if (rc != 0)
2791 goto out;
2792
2793 sock_register(&packet_family_ops);
2794 register_pernet_subsys(&packet_net_ops);
2795 register_netdevice_notifier(&packet_netdev_notifier);
2796out:
2797 return rc;
2798}
2799
2800module_init(packet_init);
2801module_exit(packet_exit);
2802MODULE_LICENSE("GPL");
2803MODULE_ALIAS_NETPROTO(PF_PACKET);
Linux kernel - Deliverables
This page took 0.176138 seconds and 5 git commands to generate.