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nfsd4: typo logical vs bitwise negate for want_mask
[linux-btrfs-devel.git] / net / packet / af_packet.c
blobc698cec0a44541b330d71420bfa09468c512034f
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
104 On receive:
105 -----------
106
107 Incoming, dev->hard_header!=NULL
108 mac_header -> ll header
109 data -> data
110
111 Outgoing, dev->hard_header!=NULL
112 mac_header -> ll header
113 data -> ll header
114
115 Incoming, 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
121 Outgoing, dev->hard_header==NULL
122 mac_header -> data. ll header is still not built!
123 data -> data
124
125 Resume
126 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
127
128
129 On transmit:
130 ------------
131
132 dev->hard_header != NULL
133 mac_header -> ll header
134 data -> ll header
135
136 dev->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
146 struct 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 */
157 struct 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
164 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
165 int closing, int tx_ring);
166
167 struct pgv {
168 char *buffer;
169 };
170
171 struct 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
185 struct packet_sock;
186 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
187
188 static void packet_flush_mclist(struct sock *sk);
189
190 struct packet_fanout;
191 struct packet_sock {
192 /* struct sock has to be the first member of packet_sock */
193 struct sock sk;
194 struct packet_fanout *fanout;
195 struct tpacket_stats stats;
196 struct packet_ring_buffer rx_ring;
197 struct packet_ring_buffer tx_ring;
198 int copy_thresh;
199 spinlock_t bind_lock;
200 struct mutex pg_vec_lock;
201 unsigned int running:1, /* prot_hook is attached*/
202 auxdata:1,
203 origdev:1,
204 has_vnet_hdr:1;
205 int ifindex; /* bound device */
206 __be16 num;
207 struct packet_mclist *mclist;
208 atomic_t mapped;
209 enum tpacket_versions tp_version;
210 unsigned int tp_hdrlen;
211 unsigned int tp_reserve;
212 unsigned int tp_loss:1;
213 unsigned int tp_tstamp;
214 struct packet_type prot_hook ____cacheline_aligned_in_smp;
215 };
216
217 #define PACKET_FANOUT_MAX 256
218
219 struct packet_fanout {
220 #ifdef CONFIG_NET_NS
221 struct net *net;
222 #endif
223 unsigned int num_members;
224 u16 id;
225 u8 type;
226 u8 defrag;
227 atomic_t rr_cur;
228 struct list_head list;
229 struct sock *arr[PACKET_FANOUT_MAX];
230 spinlock_t lock;
231 atomic_t sk_ref;
232 struct packet_type prot_hook ____cacheline_aligned_in_smp;
233 };
234
235 struct packet_skb_cb {
236 unsigned int origlen;
237 union {
238 struct sockaddr_pkt pkt;
239 struct sockaddr_ll ll;
240 } sa;
241 };
242
243 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
244
245 static inline struct packet_sock *pkt_sk(struct sock *sk)
246 {
247 return (struct packet_sock *)sk;
248 }
249
250 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
251 static void __fanout_link(struct sock *sk, struct packet_sock *po);
252
253 /* register_prot_hook must be invoked with the po->bind_lock held,
254 * or from a context in which asynchronous accesses to the packet
255 * socket is not possible (packet_create()).
256 */
257 static void register_prot_hook(struct sock *sk)
258 {
259 struct packet_sock *po = pkt_sk(sk);
260 if (!po->running) {
261 if (po->fanout)
262 __fanout_link(sk, po);
263 else
264 dev_add_pack(&po->prot_hook);
265 sock_hold(sk);
266 po->running = 1;
267 }
268 }
269
270 /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
271 * held. If the sync parameter is true, we will temporarily drop
272 * the po->bind_lock and do a synchronize_net to make sure no
273 * asynchronous packet processing paths still refer to the elements
274 * of po->prot_hook. If the sync parameter is false, it is the
275 * callers responsibility to take care of this.
276 */
277 static void __unregister_prot_hook(struct sock *sk, bool sync)
278 {
279 struct packet_sock *po = pkt_sk(sk);
280
281 po->running = 0;
282 if (po->fanout)
283 __fanout_unlink(sk, po);
284 else
285 __dev_remove_pack(&po->prot_hook);
286 __sock_put(sk);
287
288 if (sync) {
289 spin_unlock(&po->bind_lock);
290 synchronize_net();
291 spin_lock(&po->bind_lock);
292 }
293 }
294
295 static void unregister_prot_hook(struct sock *sk, bool sync)
296 {
297 struct packet_sock *po = pkt_sk(sk);
298
299 if (po->running)
300 __unregister_prot_hook(sk, sync);
301 }
302
303 static inline __pure struct page *pgv_to_page(void *addr)
304 {
305 if (is_vmalloc_addr(addr))
306 return vmalloc_to_page(addr);
307 return virt_to_page(addr);
308 }
309
310 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
311 {
312 union {
313 struct tpacket_hdr *h1;
314 struct tpacket2_hdr *h2;
315 void *raw;
316 } h;
317
318 h.raw = frame;
319 switch (po->tp_version) {
320 case TPACKET_V1:
321 h.h1->tp_status = status;
322 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
323 break;
324 case TPACKET_V2:
325 h.h2->tp_status = status;
326 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
327 break;
328 default:
329 pr_err("TPACKET version not supported\n");
330 BUG();
331 }
332
333 smp_wmb();
334 }
335
336 static int __packet_get_status(struct packet_sock *po, void *frame)
337 {
338 union {
339 struct tpacket_hdr *h1;
340 struct tpacket2_hdr *h2;
341 void *raw;
342 } h;
343
344 smp_rmb();
345
346 h.raw = frame;
347 switch (po->tp_version) {
348 case TPACKET_V1:
349 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
350 return h.h1->tp_status;
351 case TPACKET_V2:
352 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
353 return h.h2->tp_status;
354 default:
355 pr_err("TPACKET version not supported\n");
356 BUG();
357 return 0;
358 }
359 }
360
361 static void *packet_lookup_frame(struct packet_sock *po,
362 struct packet_ring_buffer *rb,
363 unsigned int position,
364 int status)
365 {
366 unsigned int pg_vec_pos, frame_offset;
367 union {
368 struct tpacket_hdr *h1;
369 struct tpacket2_hdr *h2;
370 void *raw;
371 } h;
372
373 pg_vec_pos = position / rb->frames_per_block;
374 frame_offset = position % rb->frames_per_block;
375
376 h.raw = rb->pg_vec[pg_vec_pos].buffer +
377 (frame_offset * rb->frame_size);
378
379 if (status != __packet_get_status(po, h.raw))
380 return NULL;
381
382 return h.raw;
383 }
384
385 static inline void *packet_current_frame(struct packet_sock *po,
386 struct packet_ring_buffer *rb,
387 int status)
388 {
389 return packet_lookup_frame(po, rb, rb->head, status);
390 }
391
392 static inline void *packet_previous_frame(struct packet_sock *po,
393 struct packet_ring_buffer *rb,
394 int status)
395 {
396 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
397 return packet_lookup_frame(po, rb, previous, status);
398 }
399
400 static inline void packet_increment_head(struct packet_ring_buffer *buff)
401 {
402 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
403 }
404
405 static void packet_sock_destruct(struct sock *sk)
406 {
407 skb_queue_purge(&sk->sk_error_queue);
408
409 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
410 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
411
412 if (!sock_flag(sk, SOCK_DEAD)) {
413 pr_err("Attempt to release alive packet socket: %p\n", sk);
414 return;
415 }
416
417 sk_refcnt_debug_dec(sk);
418 }
419
420 static int fanout_rr_next(struct packet_fanout *f, unsigned int num)
421 {
422 int x = atomic_read(&f->rr_cur) + 1;
423
424 if (x >= num)
425 x = 0;
426
427 return x;
428 }
429
430 static struct sock *fanout_demux_hash(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
431 {
432 u32 idx, hash = skb->rxhash;
433
434 idx = ((u64)hash * num) >> 32;
435
436 return f->arr[idx];
437 }
438
439 static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
440 {
441 int cur, old;
442
443 cur = atomic_read(&f->rr_cur);
444 while ((old = atomic_cmpxchg(&f->rr_cur, cur,
445 fanout_rr_next(f, num))) != cur)
446 cur = old;
447 return f->arr[cur];
448 }
449
450 static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
451 {
452 unsigned int cpu = smp_processor_id();
453
454 return f->arr[cpu % num];
455 }
456
457 static struct sk_buff *fanout_check_defrag(struct sk_buff *skb)
458 {
459 #ifdef CONFIG_INET
460 const struct iphdr *iph;
461 u32 len;
462
463 if (skb->protocol != htons(ETH_P_IP))
464 return skb;
465
466 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
467 return skb;
468
469 iph = ip_hdr(skb);
470 if (iph->ihl < 5 || iph->version != 4)
471 return skb;
472 if (!pskb_may_pull(skb, iph->ihl*4))
473 return skb;
474 iph = ip_hdr(skb);
475 len = ntohs(iph->tot_len);
476 if (skb->len < len || len < (iph->ihl * 4))
477 return skb;
478
479 if (ip_is_fragment(ip_hdr(skb))) {
480 skb = skb_share_check(skb, GFP_ATOMIC);
481 if (skb) {
482 if (pskb_trim_rcsum(skb, len))
483 return skb;
484 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
485 if (ip_defrag(skb, IP_DEFRAG_AF_PACKET))
486 return NULL;
487 skb->rxhash = 0;
488 }
489 }
490 #endif
491 return skb;
492 }
493
494 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
495 struct packet_type *pt, struct net_device *orig_dev)
496 {
497 struct packet_fanout *f = pt->af_packet_priv;
498 unsigned int num = f->num_members;
499 struct packet_sock *po;
500 struct sock *sk;
501
502 if (!net_eq(dev_net(dev), read_pnet(&f->net)) ||
503 !num) {
504 kfree_skb(skb);
505 return 0;
506 }
507
508 switch (f->type) {
509 case PACKET_FANOUT_HASH:
510 default:
511 if (f->defrag) {
512 skb = fanout_check_defrag(skb);
513 if (!skb)
514 return 0;
515 }
516 skb_get_rxhash(skb);
517 sk = fanout_demux_hash(f, skb, num);
518 break;
519 case PACKET_FANOUT_LB:
520 sk = fanout_demux_lb(f, skb, num);
521 break;
522 case PACKET_FANOUT_CPU:
523 sk = fanout_demux_cpu(f, skb, num);
524 break;
525 }
526
527 po = pkt_sk(sk);
528
529 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
530 }
531
532 static DEFINE_MUTEX(fanout_mutex);
533 static LIST_HEAD(fanout_list);
534
535 static void __fanout_link(struct sock *sk, struct packet_sock *po)
536 {
537 struct packet_fanout *f = po->fanout;
538
539 spin_lock(&f->lock);
540 f->arr[f->num_members] = sk;
541 smp_wmb();
542 f->num_members++;
543 spin_unlock(&f->lock);
544 }
545
546 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
547 {
548 struct packet_fanout *f = po->fanout;
549 int i;
550
551 spin_lock(&f->lock);
552 for (i = 0; i < f->num_members; i++) {
553 if (f->arr[i] == sk)
554 break;
555 }
556 BUG_ON(i >= f->num_members);
557 f->arr[i] = f->arr[f->num_members - 1];
558 f->num_members--;
559 spin_unlock(&f->lock);
560 }
561
562 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
563 {
564 struct packet_sock *po = pkt_sk(sk);
565 struct packet_fanout *f, *match;
566 u8 type = type_flags & 0xff;
567 u8 defrag = (type_flags & PACKET_FANOUT_FLAG_DEFRAG) ? 1 : 0;
568 int err;
569
570 switch (type) {
571 case PACKET_FANOUT_HASH:
572 case PACKET_FANOUT_LB:
573 case PACKET_FANOUT_CPU:
574 break;
575 default:
576 return -EINVAL;
577 }
578
579 if (!po->running)
580 return -EINVAL;
581
582 if (po->fanout)
583 return -EALREADY;
584
585 mutex_lock(&fanout_mutex);
586 match = NULL;
587 list_for_each_entry(f, &fanout_list, list) {
588 if (f->id == id &&
589 read_pnet(&f->net) == sock_net(sk)) {
590 match = f;
591 break;
592 }
593 }
594 err = -EINVAL;
595 if (match && match->defrag != defrag)
596 goto out;
597 if (!match) {
598 err = -ENOMEM;
599 match = kzalloc(sizeof(*match), GFP_KERNEL);
600 if (!match)
601 goto out;
602 write_pnet(&match->net, sock_net(sk));
603 match->id = id;
604 match->type = type;
605 match->defrag = defrag;
606 atomic_set(&match->rr_cur, 0);
607 INIT_LIST_HEAD(&match->list);
608 spin_lock_init(&match->lock);
609 atomic_set(&match->sk_ref, 0);
610 match->prot_hook.type = po->prot_hook.type;
611 match->prot_hook.dev = po->prot_hook.dev;
612 match->prot_hook.func = packet_rcv_fanout;
613 match->prot_hook.af_packet_priv = match;
614 dev_add_pack(&match->prot_hook);
615 list_add(&match->list, &fanout_list);
616 }
617 err = -EINVAL;
618 if (match->type == type &&
619 match->prot_hook.type == po->prot_hook.type &&
620 match->prot_hook.dev == po->prot_hook.dev) {
621 err = -ENOSPC;
622 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
623 __dev_remove_pack(&po->prot_hook);
624 po->fanout = match;
625 atomic_inc(&match->sk_ref);
626 __fanout_link(sk, po);
627 err = 0;
628 }
629 }
630 out:
631 mutex_unlock(&fanout_mutex);
632 return err;
633 }
634
635 static void fanout_release(struct sock *sk)
636 {
637 struct packet_sock *po = pkt_sk(sk);
638 struct packet_fanout *f;
639
640 f = po->fanout;
641 if (!f)
642 return;
643
644 po->fanout = NULL;
645
646 mutex_lock(&fanout_mutex);
647 if (atomic_dec_and_test(&f->sk_ref)) {
648 list_del(&f->list);
649 dev_remove_pack(&f->prot_hook);
650 kfree(f);
651 }
652 mutex_unlock(&fanout_mutex);
653 }
654
655 static const struct proto_ops packet_ops;
656
657 static const struct proto_ops packet_ops_spkt;
658
659 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
660 struct packet_type *pt, struct net_device *orig_dev)
661 {
662 struct sock *sk;
663 struct sockaddr_pkt *spkt;
664
665 /*
666 * When we registered the protocol we saved the socket in the data
667 * field for just this event.
668 */
669
670 sk = pt->af_packet_priv;
671
672 /*
673 * Yank back the headers [hope the device set this
674 * right or kerboom...]
675 *
676 * Incoming packets have ll header pulled,
677 * push it back.
678 *
679 * For outgoing ones skb->data == skb_mac_header(skb)
680 * so that this procedure is noop.
681 */
682
683 if (skb->pkt_type == PACKET_LOOPBACK)
684 goto out;
685
686 if (!net_eq(dev_net(dev), sock_net(sk)))
687 goto out;
688
689 skb = skb_share_check(skb, GFP_ATOMIC);
690 if (skb == NULL)
691 goto oom;
692
693 /* drop any routing info */
694 skb_dst_drop(skb);
695
696 /* drop conntrack reference */
697 nf_reset(skb);
698
699 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
700
701 skb_push(skb, skb->data - skb_mac_header(skb));
702
703 /*
704 * The SOCK_PACKET socket receives _all_ frames.
705 */
706
707 spkt->spkt_family = dev->type;
708 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
709 spkt->spkt_protocol = skb->protocol;
710
711 /*
712 * Charge the memory to the socket. This is done specifically
713 * to prevent sockets using all the memory up.
714 */
715
716 if (sock_queue_rcv_skb(sk, skb) == 0)
717 return 0;
718
719 out:
720 kfree_skb(skb);
721 oom:
722 return 0;
723 }
724
725
726 /*
727 * Output a raw packet to a device layer. This bypasses all the other
728 * protocol layers and you must therefore supply it with a complete frame
729 */
730
731 static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
732 struct msghdr *msg, size_t len)
733 {
734 struct sock *sk = sock->sk;
735 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
736 struct sk_buff *skb = NULL;
737 struct net_device *dev;
738 __be16 proto = 0;
739 int err;
740
741 /*
742 * Get and verify the address.
743 */
744
745 if (saddr) {
746 if (msg->msg_namelen < sizeof(struct sockaddr))
747 return -EINVAL;
748 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
749 proto = saddr->spkt_protocol;
750 } else
751 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
752
753 /*
754 * Find the device first to size check it
755 */
756
757 saddr->spkt_device[13] = 0;
758 retry:
759 rcu_read_lock();
760 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
761 err = -ENODEV;
762 if (dev == NULL)
763 goto out_unlock;
764
765 err = -ENETDOWN;
766 if (!(dev->flags & IFF_UP))
767 goto out_unlock;
768
769 /*
770 * You may not queue a frame bigger than the mtu. This is the lowest level
771 * raw protocol and you must do your own fragmentation at this level.
772 */
773
774 err = -EMSGSIZE;
775 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
776 goto out_unlock;
777
778 if (!skb) {
779 size_t reserved = LL_RESERVED_SPACE(dev);
780 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
781
782 rcu_read_unlock();
783 skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL);
784 if (skb == NULL)
785 return -ENOBUFS;
786 /* FIXME: Save some space for broken drivers that write a hard
787 * header at transmission time by themselves. PPP is the notable
788 * one here. This should really be fixed at the driver level.
789 */
790 skb_reserve(skb, reserved);
791 skb_reset_network_header(skb);
792
793 /* Try to align data part correctly */
794 if (hhlen) {
795 skb->data -= hhlen;
796 skb->tail -= hhlen;
797 if (len < hhlen)
798 skb_reset_network_header(skb);
799 }
800 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
801 if (err)
802 goto out_free;
803 goto retry;
804 }
805
806 if (len > (dev->mtu + dev->hard_header_len)) {
807 /* Earlier code assumed this would be a VLAN pkt,
808 * double-check this now that we have the actual
809 * packet in hand.
810 */
811 struct ethhdr *ehdr;
812 skb_reset_mac_header(skb);
813 ehdr = eth_hdr(skb);
814 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
815 err = -EMSGSIZE;
816 goto out_unlock;
817 }
818 }
819
820 skb->protocol = proto;
821 skb->dev = dev;
822 skb->priority = sk->sk_priority;
823 skb->mark = sk->sk_mark;
824 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
825 if (err < 0)
826 goto out_unlock;
827
828 dev_queue_xmit(skb);
829 rcu_read_unlock();
830 return len;
831
832 out_unlock:
833 rcu_read_unlock();
834 out_free:
835 kfree_skb(skb);
836 return err;
837 }
838
839 static inline unsigned int run_filter(const struct sk_buff *skb,
840 const struct sock *sk,
841 unsigned int res)
842 {
843 struct sk_filter *filter;
844
845 rcu_read_lock();
846 filter = rcu_dereference(sk->sk_filter);
847 if (filter != NULL)
848 res = SK_RUN_FILTER(filter, skb);
849 rcu_read_unlock();
850
851 return res;
852 }
853
854 /*
855 * This function makes lazy skb cloning in hope that most of packets
856 * are discarded by BPF.
857 *
858 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
859 * and skb->cb are mangled. It works because (and until) packets
860 * falling here are owned by current CPU. Output packets are cloned
861 * by dev_queue_xmit_nit(), input packets are processed by net_bh
862 * sequencially, so that if we return skb to original state on exit,
863 * we will not harm anyone.
864 */
865
866 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
867 struct packet_type *pt, struct net_device *orig_dev)
868 {
869 struct sock *sk;
870 struct sockaddr_ll *sll;
871 struct packet_sock *po;
872 u8 *skb_head = skb->data;
873 int skb_len = skb->len;
874 unsigned int snaplen, res;
875
876 if (skb->pkt_type == PACKET_LOOPBACK)
877 goto drop;
878
879 sk = pt->af_packet_priv;
880 po = pkt_sk(sk);
881
882 if (!net_eq(dev_net(dev), sock_net(sk)))
883 goto drop;
884
885 skb->dev = dev;
886
887 if (dev->header_ops) {
888 /* The device has an explicit notion of ll header,
889 * exported to higher levels.
890 *
891 * Otherwise, the device hides details of its frame
892 * structure, so that corresponding packet head is
893 * never delivered to user.
894 */
895 if (sk->sk_type != SOCK_DGRAM)
896 skb_push(skb, skb->data - skb_mac_header(skb));
897 else if (skb->pkt_type == PACKET_OUTGOING) {
898 /* Special case: outgoing packets have ll header at head */
899 skb_pull(skb, skb_network_offset(skb));
900 }
901 }
902
903 snaplen = skb->len;
904
905 res = run_filter(skb, sk, snaplen);
906 if (!res)
907 goto drop_n_restore;
908 if (snaplen > res)
909 snaplen = res;
910
911 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
912 (unsigned)sk->sk_rcvbuf)
913 goto drop_n_acct;
914
915 if (skb_shared(skb)) {
916 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
917 if (nskb == NULL)
918 goto drop_n_acct;
919
920 if (skb_head != skb->data) {
921 skb->data = skb_head;
922 skb->len = skb_len;
923 }
924 kfree_skb(skb);
925 skb = nskb;
926 }
927
928 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
929 sizeof(skb->cb));
930
931 sll = &PACKET_SKB_CB(skb)->sa.ll;
932 sll->sll_family = AF_PACKET;
933 sll->sll_hatype = dev->type;
934 sll->sll_protocol = skb->protocol;
935 sll->sll_pkttype = skb->pkt_type;
936 if (unlikely(po->origdev))
937 sll->sll_ifindex = orig_dev->ifindex;
938 else
939 sll->sll_ifindex = dev->ifindex;
940
941 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
942
943 PACKET_SKB_CB(skb)->origlen = skb->len;
944
945 if (pskb_trim(skb, snaplen))
946 goto drop_n_acct;
947
948 skb_set_owner_r(skb, sk);
949 skb->dev = NULL;
950 skb_dst_drop(skb);
951
952 /* drop conntrack reference */
953 nf_reset(skb);
954
955 spin_lock(&sk->sk_receive_queue.lock);
956 po->stats.tp_packets++;
957 skb->dropcount = atomic_read(&sk->sk_drops);
958 __skb_queue_tail(&sk->sk_receive_queue, skb);
959 spin_unlock(&sk->sk_receive_queue.lock);
960 sk->sk_data_ready(sk, skb->len);
961 return 0;
962
963 drop_n_acct:
964 po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
965
966 drop_n_restore:
967 if (skb_head != skb->data && skb_shared(skb)) {
968 skb->data = skb_head;
969 skb->len = skb_len;
970 }
971 drop:
972 consume_skb(skb);
973 return 0;
974 }
975
976 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
977 struct packet_type *pt, struct net_device *orig_dev)
978 {
979 struct sock *sk;
980 struct packet_sock *po;
981 struct sockaddr_ll *sll;
982 union {
983 struct tpacket_hdr *h1;
984 struct tpacket2_hdr *h2;
985 void *raw;
986 } h;
987 u8 *skb_head = skb->data;
988 int skb_len = skb->len;
989 unsigned int snaplen, res;
990 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
991 unsigned short macoff, netoff, hdrlen;
992 struct sk_buff *copy_skb = NULL;
993 struct timeval tv;
994 struct timespec ts;
995 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
996
997 if (skb->pkt_type == PACKET_LOOPBACK)
998 goto drop;
999
1000 sk = pt->af_packet_priv;
1001 po = pkt_sk(sk);
1002
1003 if (!net_eq(dev_net(dev), sock_net(sk)))
1004 goto drop;
1005
1006 if (dev->header_ops) {
1007 if (sk->sk_type != SOCK_DGRAM)
1008 skb_push(skb, skb->data - skb_mac_header(skb));
1009 else if (skb->pkt_type == PACKET_OUTGOING) {
1010 /* Special case: outgoing packets have ll header at head */
1011 skb_pull(skb, skb_network_offset(skb));
1012 }
1013 }
1014
1015 if (skb->ip_summed == CHECKSUM_PARTIAL)
1016 status |= TP_STATUS_CSUMNOTREADY;
1017
1018 snaplen = skb->len;
1019
1020 res = run_filter(skb, sk, snaplen);
1021 if (!res)
1022 goto drop_n_restore;
1023 if (snaplen > res)
1024 snaplen = res;
1025
1026 if (sk->sk_type == SOCK_DGRAM) {
1027 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
1028 po->tp_reserve;
1029 } else {
1030 unsigned maclen = skb_network_offset(skb);
1031 netoff = TPACKET_ALIGN(po->tp_hdrlen +
1032 (maclen < 16 ? 16 : maclen)) +
1033 po->tp_reserve;
1034 macoff = netoff - maclen;
1035 }
1036
1037 if (macoff + snaplen > po->rx_ring.frame_size) {
1038 if (po->copy_thresh &&
1039 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
1040 (unsigned)sk->sk_rcvbuf) {
1041 if (skb_shared(skb)) {
1042 copy_skb = skb_clone(skb, GFP_ATOMIC);
1043 } else {
1044 copy_skb = skb_get(skb);
1045 skb_head = skb->data;
1046 }
1047 if (copy_skb)
1048 skb_set_owner_r(copy_skb, sk);
1049 }
1050 snaplen = po->rx_ring.frame_size - macoff;
1051 if ((int)snaplen < 0)
1052 snaplen = 0;
1053 }
1054
1055 spin_lock(&sk->sk_receive_queue.lock);
1056 h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
1057 if (!h.raw)
1058 goto ring_is_full;
1059 packet_increment_head(&po->rx_ring);
1060 po->stats.tp_packets++;
1061 if (copy_skb) {
1062 status |= TP_STATUS_COPY;
1063 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
1064 }
1065 if (!po->stats.tp_drops)
1066 status &= ~TP_STATUS_LOSING;
1067 spin_unlock(&sk->sk_receive_queue.lock);
1068
1069 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
1070
1071 switch (po->tp_version) {
1072 case TPACKET_V1:
1073 h.h1->tp_len = skb->len;
1074 h.h1->tp_snaplen = snaplen;
1075 h.h1->tp_mac = macoff;
1076 h.h1->tp_net = netoff;
1077 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1078 && shhwtstamps->syststamp.tv64)
1079 tv = ktime_to_timeval(shhwtstamps->syststamp);
1080 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1081 && shhwtstamps->hwtstamp.tv64)
1082 tv = ktime_to_timeval(shhwtstamps->hwtstamp);
1083 else if (skb->tstamp.tv64)
1084 tv = ktime_to_timeval(skb->tstamp);
1085 else
1086 do_gettimeofday(&tv);
1087 h.h1->tp_sec = tv.tv_sec;
1088 h.h1->tp_usec = tv.tv_usec;
1089 hdrlen = sizeof(*h.h1);
1090 break;
1091 case TPACKET_V2:
1092 h.h2->tp_len = skb->len;
1093 h.h2->tp_snaplen = snaplen;
1094 h.h2->tp_mac = macoff;
1095 h.h2->tp_net = netoff;
1096 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1097 && shhwtstamps->syststamp.tv64)
1098 ts = ktime_to_timespec(shhwtstamps->syststamp);
1099 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1100 && shhwtstamps->hwtstamp.tv64)
1101 ts = ktime_to_timespec(shhwtstamps->hwtstamp);
1102 else if (skb->tstamp.tv64)
1103 ts = ktime_to_timespec(skb->tstamp);
1104 else
1105 getnstimeofday(&ts);
1106 h.h2->tp_sec = ts.tv_sec;
1107 h.h2->tp_nsec = ts.tv_nsec;
1108 if (vlan_tx_tag_present(skb)) {
1109 h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
1110 status |= TP_STATUS_VLAN_VALID;
1111 } else {
1112 h.h2->tp_vlan_tci = 0;
1113 }
1114 h.h2->tp_padding = 0;
1115 hdrlen = sizeof(*h.h2);
1116 break;
1117 default:
1118 BUG();
1119 }
1120
1121 sll = h.raw + TPACKET_ALIGN(hdrlen);
1122 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1123 sll->sll_family = AF_PACKET;
1124 sll->sll_hatype = dev->type;
1125 sll->sll_protocol = skb->protocol;
1126 sll->sll_pkttype = skb->pkt_type;
1127 if (unlikely(po->origdev))
1128 sll->sll_ifindex = orig_dev->ifindex;
1129 else
1130 sll->sll_ifindex = dev->ifindex;
1131
1132 smp_mb();
1133 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
1134 {
1135 u8 *start, *end;
1136
1137 end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen);
1138 for (start = h.raw; start < end; start += PAGE_SIZE)
1139 flush_dcache_page(pgv_to_page(start));
1140 smp_wmb();
1141 }
1142 #endif
1143 __packet_set_status(po, h.raw, status);
1144
1145 sk->sk_data_ready(sk, 0);
1146
1147 drop_n_restore:
1148 if (skb_head != skb->data && skb_shared(skb)) {
1149 skb->data = skb_head;
1150 skb->len = skb_len;
1151 }
1152 drop:
1153 kfree_skb(skb);
1154 return 0;
1155
1156 ring_is_full:
1157 po->stats.tp_drops++;
1158 spin_unlock(&sk->sk_receive_queue.lock);
1159
1160 sk->sk_data_ready(sk, 0);
1161 kfree_skb(copy_skb);
1162 goto drop_n_restore;
1163 }
1164
1165 static void tpacket_destruct_skb(struct sk_buff *skb)
1166 {
1167 struct packet_sock *po = pkt_sk(skb->sk);
1168 void *ph;
1169
1170 BUG_ON(skb == NULL);
1171
1172 if (likely(po->tx_ring.pg_vec)) {
1173 ph = skb_shinfo(skb)->destructor_arg;
1174 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
1175 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
1176 atomic_dec(&po->tx_ring.pending);
1177 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
1178 }
1179
1180 sock_wfree(skb);
1181 }
1182
1183 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
1184 void *frame, struct net_device *dev, int size_max,
1185 __be16 proto, unsigned char *addr)
1186 {
1187 union {
1188 struct tpacket_hdr *h1;
1189 struct tpacket2_hdr *h2;
1190 void *raw;
1191 } ph;
1192 int to_write, offset, len, tp_len, nr_frags, len_max;
1193 struct socket *sock = po->sk.sk_socket;
1194 struct page *page;
1195 void *data;
1196 int err;
1197
1198 ph.raw = frame;
1199
1200 skb->protocol = proto;
1201 skb->dev = dev;
1202 skb->priority = po->sk.sk_priority;
1203 skb->mark = po->sk.sk_mark;
1204 skb_shinfo(skb)->destructor_arg = ph.raw;
1205
1206 switch (po->tp_version) {
1207 case TPACKET_V2:
1208 tp_len = ph.h2->tp_len;
1209 break;
1210 default:
1211 tp_len = ph.h1->tp_len;
1212 break;
1213 }
1214 if (unlikely(tp_len > size_max)) {
1215 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
1216 return -EMSGSIZE;
1217 }
1218
1219 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1220 skb_reset_network_header(skb);
1221
1222 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
1223 to_write = tp_len;
1224
1225 if (sock->type == SOCK_DGRAM) {
1226 err = dev_hard_header(skb, dev, ntohs(proto), addr,
1227 NULL, tp_len);
1228 if (unlikely(err < 0))
1229 return -EINVAL;
1230 } else if (dev->hard_header_len) {
1231 /* net device doesn't like empty head */
1232 if (unlikely(tp_len <= dev->hard_header_len)) {
1233 pr_err("packet size is too short (%d < %d)\n",
1234 tp_len, dev->hard_header_len);
1235 return -EINVAL;
1236 }
1237
1238 skb_push(skb, dev->hard_header_len);
1239 err = skb_store_bits(skb, 0, data,
1240 dev->hard_header_len);
1241 if (unlikely(err))
1242 return err;
1243
1244 data += dev->hard_header_len;
1245 to_write -= dev->hard_header_len;
1246 }
1247
1248 err = -EFAULT;
1249 offset = offset_in_page(data);
1250 len_max = PAGE_SIZE - offset;
1251 len = ((to_write > len_max) ? len_max : to_write);
1252
1253 skb->data_len = to_write;
1254 skb->len += to_write;
1255 skb->truesize += to_write;
1256 atomic_add(to_write, &po->sk.sk_wmem_alloc);
1257
1258 while (likely(to_write)) {
1259 nr_frags = skb_shinfo(skb)->nr_frags;
1260
1261 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
1262 pr_err("Packet exceed the number of skb frags(%lu)\n",
1263 MAX_SKB_FRAGS);
1264 return -EFAULT;
1265 }
1266
1267 page = pgv_to_page(data);
1268 data += len;
1269 flush_dcache_page(page);
1270 get_page(page);
1271 skb_fill_page_desc(skb, nr_frags, page, offset, len);
1272 to_write -= len;
1273 offset = 0;
1274 len_max = PAGE_SIZE;
1275 len = ((to_write > len_max) ? len_max : to_write);
1276 }
1277
1278 return tp_len;
1279 }
1280
1281 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
1282 {
1283 struct sk_buff *skb;
1284 struct net_device *dev;
1285 __be16 proto;
1286 bool need_rls_dev = false;
1287 int err, reserve = 0;
1288 void *ph;
1289 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1290 int tp_len, size_max;
1291 unsigned char *addr;
1292 int len_sum = 0;
1293 int status = 0;
1294
1295 mutex_lock(&po->pg_vec_lock);
1296
1297 err = -EBUSY;
1298 if (saddr == NULL) {
1299 dev = po->prot_hook.dev;
1300 proto = po->num;
1301 addr = NULL;
1302 } else {
1303 err = -EINVAL;
1304 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1305 goto out;
1306 if (msg->msg_namelen < (saddr->sll_halen
1307 + offsetof(struct sockaddr_ll,
1308 sll_addr)))
1309 goto out;
1310 proto = saddr->sll_protocol;
1311 addr = saddr->sll_addr;
1312 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
1313 need_rls_dev = true;
1314 }
1315
1316 err = -ENXIO;
1317 if (unlikely(dev == NULL))
1318 goto out;
1319
1320 reserve = dev->hard_header_len;
1321
1322 err = -ENETDOWN;
1323 if (unlikely(!(dev->flags & IFF_UP)))
1324 goto out_put;
1325
1326 size_max = po->tx_ring.frame_size
1327 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
1328
1329 if (size_max > dev->mtu + reserve)
1330 size_max = dev->mtu + reserve;
1331
1332 do {
1333 ph = packet_current_frame(po, &po->tx_ring,
1334 TP_STATUS_SEND_REQUEST);
1335
1336 if (unlikely(ph == NULL)) {
1337 schedule();
1338 continue;
1339 }
1340
1341 status = TP_STATUS_SEND_REQUEST;
1342 skb = sock_alloc_send_skb(&po->sk,
1343 LL_ALLOCATED_SPACE(dev)
1344 + sizeof(struct sockaddr_ll),
1345 0, &err);
1346
1347 if (unlikely(skb == NULL))
1348 goto out_status;
1349
1350 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1351 addr);
1352
1353 if (unlikely(tp_len < 0)) {
1354 if (po->tp_loss) {
1355 __packet_set_status(po, ph,
1356 TP_STATUS_AVAILABLE);
1357 packet_increment_head(&po->tx_ring);
1358 kfree_skb(skb);
1359 continue;
1360 } else {
1361 status = TP_STATUS_WRONG_FORMAT;
1362 err = tp_len;
1363 goto out_status;
1364 }
1365 }
1366
1367 skb->destructor = tpacket_destruct_skb;
1368 __packet_set_status(po, ph, TP_STATUS_SENDING);
1369 atomic_inc(&po->tx_ring.pending);
1370
1371 status = TP_STATUS_SEND_REQUEST;
1372 err = dev_queue_xmit(skb);
1373 if (unlikely(err > 0)) {
1374 err = net_xmit_errno(err);
1375 if (err && __packet_get_status(po, ph) ==
1376 TP_STATUS_AVAILABLE) {
1377 /* skb was destructed already */
1378 skb = NULL;
1379 goto out_status;
1380 }
1381 /*
1382 * skb was dropped but not destructed yet;
1383 * let's treat it like congestion or err < 0
1384 */
1385 err = 0;
1386 }
1387 packet_increment_head(&po->tx_ring);
1388 len_sum += tp_len;
1389 } while (likely((ph != NULL) ||
1390 ((!(msg->msg_flags & MSG_DONTWAIT)) &&
1391 (atomic_read(&po->tx_ring.pending))))
1392 );
1393
1394 err = len_sum;
1395 goto out_put;
1396
1397 out_status:
1398 __packet_set_status(po, ph, status);
1399 kfree_skb(skb);
1400 out_put:
1401 if (need_rls_dev)
1402 dev_put(dev);
1403 out:
1404 mutex_unlock(&po->pg_vec_lock);
1405 return err;
1406 }
1407
1408 static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
1409 size_t reserve, size_t len,
1410 size_t linear, int noblock,
1411 int *err)
1412 {
1413 struct sk_buff *skb;
1414
1415 /* Under a page? Don't bother with paged skb. */
1416 if (prepad + len < PAGE_SIZE || !linear)
1417 linear = len;
1418
1419 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
1420 err);
1421 if (!skb)
1422 return NULL;
1423
1424 skb_reserve(skb, reserve);
1425 skb_put(skb, linear);
1426 skb->data_len = len - linear;
1427 skb->len += len - linear;
1428
1429 return skb;
1430 }
1431
1432 static int packet_snd(struct socket *sock,
1433 struct msghdr *msg, size_t len)
1434 {
1435 struct sock *sk = sock->sk;
1436 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1437 struct sk_buff *skb;
1438 struct net_device *dev;
1439 __be16 proto;
1440 bool need_rls_dev = false;
1441 unsigned char *addr;
1442 int err, reserve = 0;
1443 struct virtio_net_hdr vnet_hdr = { 0 };
1444 int offset = 0;
1445 int vnet_hdr_len;
1446 struct packet_sock *po = pkt_sk(sk);
1447 unsigned short gso_type = 0;
1448
1449 /*
1450 * Get and verify the address.
1451 */
1452
1453 if (saddr == NULL) {
1454 dev = po->prot_hook.dev;
1455 proto = po->num;
1456 addr = NULL;
1457 } else {
1458 err = -EINVAL;
1459 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1460 goto out;
1461 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1462 goto out;
1463 proto = saddr->sll_protocol;
1464 addr = saddr->sll_addr;
1465 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
1466 need_rls_dev = true;
1467 }
1468
1469 err = -ENXIO;
1470 if (dev == NULL)
1471 goto out_unlock;
1472 if (sock->type == SOCK_RAW)
1473 reserve = dev->hard_header_len;
1474
1475 err = -ENETDOWN;
1476 if (!(dev->flags & IFF_UP))
1477 goto out_unlock;
1478
1479 if (po->has_vnet_hdr) {
1480 vnet_hdr_len = sizeof(vnet_hdr);
1481
1482 err = -EINVAL;
1483 if (len < vnet_hdr_len)
1484 goto out_unlock;
1485
1486 len -= vnet_hdr_len;
1487
1488 err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
1489 vnet_hdr_len);
1490 if (err < 0)
1491 goto out_unlock;
1492
1493 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
1494 (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
1495 vnet_hdr.hdr_len))
1496 vnet_hdr.hdr_len = vnet_hdr.csum_start +
1497 vnet_hdr.csum_offset + 2;
1498
1499 err = -EINVAL;
1500 if (vnet_hdr.hdr_len > len)
1501 goto out_unlock;
1502
1503 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1504 switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1505 case VIRTIO_NET_HDR_GSO_TCPV4:
1506 gso_type = SKB_GSO_TCPV4;
1507 break;
1508 case VIRTIO_NET_HDR_GSO_TCPV6:
1509 gso_type = SKB_GSO_TCPV6;
1510 break;
1511 case VIRTIO_NET_HDR_GSO_UDP:
1512 gso_type = SKB_GSO_UDP;
1513 break;
1514 default:
1515 goto out_unlock;
1516 }
1517
1518 if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
1519 gso_type |= SKB_GSO_TCP_ECN;
1520
1521 if (vnet_hdr.gso_size == 0)
1522 goto out_unlock;
1523
1524 }
1525 }
1526
1527 err = -EMSGSIZE;
1528 if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
1529 goto out_unlock;
1530
1531 err = -ENOBUFS;
1532 skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
1533 LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
1534 msg->msg_flags & MSG_DONTWAIT, &err);
1535 if (skb == NULL)
1536 goto out_unlock;
1537
1538 skb_set_network_header(skb, reserve);
1539
1540 err = -EINVAL;
1541 if (sock->type == SOCK_DGRAM &&
1542 (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
1543 goto out_free;
1544
1545 /* Returns -EFAULT on error */
1546 err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
1547 if (err)
1548 goto out_free;
1549 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1550 if (err < 0)
1551 goto out_free;
1552
1553 if (!gso_type && (len > dev->mtu + reserve)) {
1554 /* Earlier code assumed this would be a VLAN pkt,
1555 * double-check this now that we have the actual
1556 * packet in hand.
1557 */
1558 struct ethhdr *ehdr;
1559 skb_reset_mac_header(skb);
1560 ehdr = eth_hdr(skb);
1561 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
1562 err = -EMSGSIZE;
1563 goto out_free;
1564 }
1565 }
1566
1567 skb->protocol = proto;
1568 skb->dev = dev;
1569 skb->priority = sk->sk_priority;
1570 skb->mark = sk->sk_mark;
1571
1572 if (po->has_vnet_hdr) {
1573 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1574 if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
1575 vnet_hdr.csum_offset)) {
1576 err = -EINVAL;
1577 goto out_free;
1578 }
1579 }
1580
1581 skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
1582 skb_shinfo(skb)->gso_type = gso_type;
1583
1584 /* Header must be checked, and gso_segs computed. */
1585 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
1586 skb_shinfo(skb)->gso_segs = 0;
1587
1588 len += vnet_hdr_len;
1589 }
1590
1591 /*
1592 * Now send it
1593 */
1594
1595 err = dev_queue_xmit(skb);
1596 if (err > 0 && (err = net_xmit_errno(err)) != 0)
1597 goto out_unlock;
1598
1599 if (need_rls_dev)
1600 dev_put(dev);
1601
1602 return len;
1603
1604 out_free:
1605 kfree_skb(skb);
1606 out_unlock:
1607 if (dev && need_rls_dev)
1608 dev_put(dev);
1609 out:
1610 return err;
1611 }
1612
1613 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1614 struct msghdr *msg, size_t len)
1615 {
1616 struct sock *sk = sock->sk;
1617 struct packet_sock *po = pkt_sk(sk);
1618 if (po->tx_ring.pg_vec)
1619 return tpacket_snd(po, msg);
1620 else
1621 return packet_snd(sock, msg, len);
1622 }
1623
1624 /*
1625 * Close a PACKET socket. This is fairly simple. We immediately go
1626 * to 'closed' state and remove our protocol entry in the device list.
1627 */
1628
1629 static int packet_release(struct socket *sock)
1630 {
1631 struct sock *sk = sock->sk;
1632 struct packet_sock *po;
1633 struct net *net;
1634 struct tpacket_req req;
1635
1636 if (!sk)
1637 return 0;
1638
1639 net = sock_net(sk);
1640 po = pkt_sk(sk);
1641
1642 spin_lock_bh(&net->packet.sklist_lock);
1643 sk_del_node_init_rcu(sk);
1644 sock_prot_inuse_add(net, sk->sk_prot, -1);
1645 spin_unlock_bh(&net->packet.sklist_lock);
1646
1647 spin_lock(&po->bind_lock);
1648 unregister_prot_hook(sk, false);
1649 if (po->prot_hook.dev) {
1650 dev_put(po->prot_hook.dev);
1651 po->prot_hook.dev = NULL;
1652 }
1653 spin_unlock(&po->bind_lock);
1654
1655 packet_flush_mclist(sk);
1656
1657 memset(&req, 0, sizeof(req));
1658
1659 if (po->rx_ring.pg_vec)
1660 packet_set_ring(sk, &req, 1, 0);
1661
1662 if (po->tx_ring.pg_vec)
1663 packet_set_ring(sk, &req, 1, 1);
1664
1665 fanout_release(sk);
1666
1667 synchronize_net();
1668 /*
1669 * Now the socket is dead. No more input will appear.
1670 */
1671 sock_orphan(sk);
1672 sock->sk = NULL;
1673
1674 /* Purge queues */
1675
1676 skb_queue_purge(&sk->sk_receive_queue);
1677 sk_refcnt_debug_release(sk);
1678
1679 sock_put(sk);
1680 return 0;
1681 }
1682
1683 /*
1684 * Attach a packet hook.
1685 */
1686
1687 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1688 {
1689 struct packet_sock *po = pkt_sk(sk);
1690
1691 if (po->fanout)
1692 return -EINVAL;
1693
1694 lock_sock(sk);
1695
1696 spin_lock(&po->bind_lock);
1697 unregister_prot_hook(sk, true);
1698 po->num = protocol;
1699 po->prot_hook.type = protocol;
1700 if (po->prot_hook.dev)
1701 dev_put(po->prot_hook.dev);
1702 po->prot_hook.dev = dev;
1703
1704 po->ifindex = dev ? dev->ifindex : 0;
1705
1706 if (protocol == 0)
1707 goto out_unlock;
1708
1709 if (!dev || (dev->flags & IFF_UP)) {
1710 register_prot_hook(sk);
1711 } else {
1712 sk->sk_err = ENETDOWN;
1713 if (!sock_flag(sk, SOCK_DEAD))
1714 sk->sk_error_report(sk);
1715 }
1716
1717 out_unlock:
1718 spin_unlock(&po->bind_lock);
1719 release_sock(sk);
1720 return 0;
1721 }
1722
1723 /*
1724 * Bind a packet socket to a device
1725 */
1726
1727 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
1728 int addr_len)
1729 {
1730 struct sock *sk = sock->sk;
1731 char name[15];
1732 struct net_device *dev;
1733 int err = -ENODEV;
1734
1735 /*
1736 * Check legality
1737 */
1738
1739 if (addr_len != sizeof(struct sockaddr))
1740 return -EINVAL;
1741 strlcpy(name, uaddr->sa_data, sizeof(name));
1742
1743 dev = dev_get_by_name(sock_net(sk), name);
1744 if (dev)
1745 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1746 return err;
1747 }
1748
1749 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1750 {
1751 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1752 struct sock *sk = sock->sk;
1753 struct net_device *dev = NULL;
1754 int err;
1755
1756
1757 /*
1758 * Check legality
1759 */
1760
1761 if (addr_len < sizeof(struct sockaddr_ll))
1762 return -EINVAL;
1763 if (sll->sll_family != AF_PACKET)
1764 return -EINVAL;
1765
1766 if (sll->sll_ifindex) {
1767 err = -ENODEV;
1768 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1769 if (dev == NULL)
1770 goto out;
1771 }
1772 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1773
1774 out:
1775 return err;
1776 }
1777
1778 static struct proto packet_proto = {
1779 .name = "PACKET",
1780 .owner = THIS_MODULE,
1781 .obj_size = sizeof(struct packet_sock),
1782 };
1783
1784 /*
1785 * Create a packet of type SOCK_PACKET.
1786 */
1787
1788 static int packet_create(struct net *net, struct socket *sock, int protocol,
1789 int kern)
1790 {
1791 struct sock *sk;
1792 struct packet_sock *po;
1793 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1794 int err;
1795
1796 if (!capable(CAP_NET_RAW))
1797 return -EPERM;
1798 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1799 sock->type != SOCK_PACKET)
1800 return -ESOCKTNOSUPPORT;
1801
1802 sock->state = SS_UNCONNECTED;
1803
1804 err = -ENOBUFS;
1805 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1806 if (sk == NULL)
1807 goto out;
1808
1809 sock->ops = &packet_ops;
1810 if (sock->type == SOCK_PACKET)
1811 sock->ops = &packet_ops_spkt;
1812
1813 sock_init_data(sock, sk);
1814
1815 po = pkt_sk(sk);
1816 sk->sk_family = PF_PACKET;
1817 po->num = proto;
1818
1819 sk->sk_destruct = packet_sock_destruct;
1820 sk_refcnt_debug_inc(sk);
1821
1822 /*
1823 * Attach a protocol block
1824 */
1825
1826 spin_lock_init(&po->bind_lock);
1827 mutex_init(&po->pg_vec_lock);
1828 po->prot_hook.func = packet_rcv;
1829
1830 if (sock->type == SOCK_PACKET)
1831 po->prot_hook.func = packet_rcv_spkt;
1832
1833 po->prot_hook.af_packet_priv = sk;
1834
1835 if (proto) {
1836 po->prot_hook.type = proto;
1837 register_prot_hook(sk);
1838 }
1839
1840 spin_lock_bh(&net->packet.sklist_lock);
1841 sk_add_node_rcu(sk, &net->packet.sklist);
1842 sock_prot_inuse_add(net, &packet_proto, 1);
1843 spin_unlock_bh(&net->packet.sklist_lock);
1844
1845 return 0;
1846 out:
1847 return err;
1848 }
1849
1850 static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
1851 {
1852 struct sock_exterr_skb *serr;
1853 struct sk_buff *skb, *skb2;
1854 int copied, err;
1855
1856 err = -EAGAIN;
1857 skb = skb_dequeue(&sk->sk_error_queue);
1858 if (skb == NULL)
1859 goto out;
1860
1861 copied = skb->len;
1862 if (copied > len) {
1863 msg->msg_flags |= MSG_TRUNC;
1864 copied = len;
1865 }
1866 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1867 if (err)
1868 goto out_free_skb;
1869
1870 sock_recv_timestamp(msg, sk, skb);
1871
1872 serr = SKB_EXT_ERR(skb);
1873 put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
1874 sizeof(serr->ee), &serr->ee);
1875
1876 msg->msg_flags |= MSG_ERRQUEUE;
1877 err = copied;
1878
1879 /* Reset and regenerate socket error */
1880 spin_lock_bh(&sk->sk_error_queue.lock);
1881 sk->sk_err = 0;
1882 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
1883 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
1884 spin_unlock_bh(&sk->sk_error_queue.lock);
1885 sk->sk_error_report(sk);
1886 } else
1887 spin_unlock_bh(&sk->sk_error_queue.lock);
1888
1889 out_free_skb:
1890 kfree_skb(skb);
1891 out:
1892 return err;
1893 }
1894
1895 /*
1896 * Pull a packet from our receive queue and hand it to the user.
1897 * If necessary we block.
1898 */
1899
1900 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1901 struct msghdr *msg, size_t len, int flags)
1902 {
1903 struct sock *sk = sock->sk;
1904 struct sk_buff *skb;
1905 int copied, err;
1906 struct sockaddr_ll *sll;
1907 int vnet_hdr_len = 0;
1908
1909 err = -EINVAL;
1910 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
1911 goto out;
1912
1913 #if 0
1914 /* What error should we return now? EUNATTACH? */
1915 if (pkt_sk(sk)->ifindex < 0)
1916 return -ENODEV;
1917 #endif
1918
1919 if (flags & MSG_ERRQUEUE) {
1920 err = packet_recv_error(sk, msg, len);
1921 goto out;
1922 }
1923
1924 /*
1925 * Call the generic datagram receiver. This handles all sorts
1926 * of horrible races and re-entrancy so we can forget about it
1927 * in the protocol layers.
1928 *
1929 * Now it will return ENETDOWN, if device have just gone down,
1930 * but then it will block.
1931 */
1932
1933 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1934
1935 /*
1936 * An error occurred so return it. Because skb_recv_datagram()
1937 * handles the blocking we don't see and worry about blocking
1938 * retries.
1939 */
1940
1941 if (skb == NULL)
1942 goto out;
1943
1944 if (pkt_sk(sk)->has_vnet_hdr) {
1945 struct virtio_net_hdr vnet_hdr = { 0 };
1946
1947 err = -EINVAL;
1948 vnet_hdr_len = sizeof(vnet_hdr);
1949 if (len < vnet_hdr_len)
1950 goto out_free;
1951
1952 len -= vnet_hdr_len;
1953
1954 if (skb_is_gso(skb)) {
1955 struct skb_shared_info *sinfo = skb_shinfo(skb);
1956
1957 /* This is a hint as to how much should be linear. */
1958 vnet_hdr.hdr_len = skb_headlen(skb);
1959 vnet_hdr.gso_size = sinfo->gso_size;
1960 if (sinfo->gso_type & SKB_GSO_TCPV4)
1961 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
1962 else if (sinfo->gso_type & SKB_GSO_TCPV6)
1963 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
1964 else if (sinfo->gso_type & SKB_GSO_UDP)
1965 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
1966 else if (sinfo->gso_type & SKB_GSO_FCOE)
1967 goto out_free;
1968 else
1969 BUG();
1970 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
1971 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
1972 } else
1973 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
1974
1975 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1976 vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
1977 vnet_hdr.csum_start = skb_checksum_start_offset(skb);
1978 vnet_hdr.csum_offset = skb->csum_offset;
1979 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
1980 vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
1981 } /* else everything is zero */
1982
1983 err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
1984 vnet_hdr_len);
1985 if (err < 0)
1986 goto out_free;
1987 }
1988
1989 /*
1990 * If the address length field is there to be filled in, we fill
1991 * it in now.
1992 */
1993
1994 sll = &PACKET_SKB_CB(skb)->sa.ll;
1995 if (sock->type == SOCK_PACKET)
1996 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1997 else
1998 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1999
2000 /*
2001 * You lose any data beyond the buffer you gave. If it worries a
2002 * user program they can ask the device for its MTU anyway.
2003 */
2004
2005 copied = skb->len;
2006 if (copied > len) {
2007 copied = len;
2008 msg->msg_flags |= MSG_TRUNC;
2009 }
2010
2011 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2012 if (err)
2013 goto out_free;
2014
2015 sock_recv_ts_and_drops(msg, sk, skb);
2016
2017 if (msg->msg_name)
2018 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
2019 msg->msg_namelen);
2020
2021 if (pkt_sk(sk)->auxdata) {
2022 struct tpacket_auxdata aux;
2023
2024 aux.tp_status = TP_STATUS_USER;
2025 if (skb->ip_summed == CHECKSUM_PARTIAL)
2026 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
2027 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
2028 aux.tp_snaplen = skb->len;
2029 aux.tp_mac = 0;
2030 aux.tp_net = skb_network_offset(skb);
2031 if (vlan_tx_tag_present(skb)) {
2032 aux.tp_vlan_tci = vlan_tx_tag_get(skb);
2033 aux.tp_status |= TP_STATUS_VLAN_VALID;
2034 } else {
2035 aux.tp_vlan_tci = 0;
2036 }
2037 aux.tp_padding = 0;
2038 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
2039 }
2040
2041 /*
2042 * Free or return the buffer as appropriate. Again this
2043 * hides all the races and re-entrancy issues from us.
2044 */
2045 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
2046
2047 out_free:
2048 skb_free_datagram(sk, skb);
2049 out:
2050 return err;
2051 }
2052
2053 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
2054 int *uaddr_len, int peer)
2055 {
2056 struct net_device *dev;
2057 struct sock *sk = sock->sk;
2058
2059 if (peer)
2060 return -EOPNOTSUPP;
2061
2062 uaddr->sa_family = AF_PACKET;
2063 rcu_read_lock();
2064 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
2065 if (dev)
2066 strncpy(uaddr->sa_data, dev->name, 14);
2067 else
2068 memset(uaddr->sa_data, 0, 14);
2069 rcu_read_unlock();
2070 *uaddr_len = sizeof(*uaddr);
2071
2072 return 0;
2073 }
2074
2075 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
2076 int *uaddr_len, int peer)
2077 {
2078 struct net_device *dev;
2079 struct sock *sk = sock->sk;
2080 struct packet_sock *po = pkt_sk(sk);
2081 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
2082
2083 if (peer)
2084 return -EOPNOTSUPP;
2085
2086 sll->sll_family = AF_PACKET;
2087 sll->sll_ifindex = po->ifindex;
2088 sll->sll_protocol = po->num;
2089 sll->sll_pkttype = 0;
2090 rcu_read_lock();
2091 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
2092 if (dev) {
2093 sll->sll_hatype = dev->type;
2094 sll->sll_halen = dev->addr_len;
2095 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
2096 } else {
2097 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
2098 sll->sll_halen = 0;
2099 }
2100 rcu_read_unlock();
2101 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
2102
2103 return 0;
2104 }
2105
2106 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
2107 int what)
2108 {
2109 switch (i->type) {
2110 case PACKET_MR_MULTICAST:
2111 if (i->alen != dev->addr_len)
2112 return -EINVAL;
2113 if (what > 0)
2114 return dev_mc_add(dev, i->addr);
2115 else
2116 return dev_mc_del(dev, i->addr);
2117 break;
2118 case PACKET_MR_PROMISC:
2119 return dev_set_promiscuity(dev, what);
2120 break;
2121 case PACKET_MR_ALLMULTI:
2122 return dev_set_allmulti(dev, what);
2123 break;
2124 case PACKET_MR_UNICAST:
2125 if (i->alen != dev->addr_len)
2126 return -EINVAL;
2127 if (what > 0)
2128 return dev_uc_add(dev, i->addr);
2129 else
2130 return dev_uc_del(dev, i->addr);
2131 break;
2132 default:
2133 break;
2134 }
2135 return 0;
2136 }
2137
2138 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
2139 {
2140 for ( ; i; i = i->next) {
2141 if (i->ifindex == dev->ifindex)
2142 packet_dev_mc(dev, i, what);
2143 }
2144 }
2145
2146 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
2147 {
2148 struct packet_sock *po = pkt_sk(sk);
2149 struct packet_mclist *ml, *i;
2150 struct net_device *dev;
2151 int err;
2152
2153 rtnl_lock();
2154
2155 err = -ENODEV;
2156 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
2157 if (!dev)
2158 goto done;
2159
2160 err = -EINVAL;
2161 if (mreq->mr_alen > dev->addr_len)
2162 goto done;
2163
2164 err = -ENOBUFS;
2165 i = kmalloc(sizeof(*i), GFP_KERNEL);
2166 if (i == NULL)
2167 goto done;
2168
2169 err = 0;
2170 for (ml = po->mclist; ml; ml = ml->next) {
2171 if (ml->ifindex == mreq->mr_ifindex &&
2172 ml->type == mreq->mr_type &&
2173 ml->alen == mreq->mr_alen &&
2174 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
2175 ml->count++;
2176 /* Free the new element ... */
2177 kfree(i);
2178 goto done;
2179 }
2180 }
2181
2182 i->type = mreq->mr_type;
2183 i->ifindex = mreq->mr_ifindex;
2184 i->alen = mreq->mr_alen;
2185 memcpy(i->addr, mreq->mr_address, i->alen);
2186 i->count = 1;
2187 i->next = po->mclist;
2188 po->mclist = i;
2189 err = packet_dev_mc(dev, i, 1);
2190 if (err) {
2191 po->mclist = i->next;
2192 kfree(i);
2193 }
2194
2195 done:
2196 rtnl_unlock();
2197 return err;
2198 }
2199
2200 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
2201 {
2202 struct packet_mclist *ml, **mlp;
2203
2204 rtnl_lock();
2205
2206 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
2207 if (ml->ifindex == mreq->mr_ifindex &&
2208 ml->type == mreq->mr_type &&
2209 ml->alen == mreq->mr_alen &&
2210 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
2211 if (--ml->count == 0) {
2212 struct net_device *dev;
2213 *mlp = ml->next;
2214 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
2215 if (dev)
2216 packet_dev_mc(dev, ml, -1);
2217 kfree(ml);
2218 }
2219 rtnl_unlock();
2220 return 0;
2221 }
2222 }
2223 rtnl_unlock();
2224 return -EADDRNOTAVAIL;
2225 }
2226
2227 static void packet_flush_mclist(struct sock *sk)
2228 {
2229 struct packet_sock *po = pkt_sk(sk);
2230 struct packet_mclist *ml;
2231
2232 if (!po->mclist)
2233 return;
2234
2235 rtnl_lock();
2236 while ((ml = po->mclist) != NULL) {
2237 struct net_device *dev;
2238
2239 po->mclist = ml->next;
2240 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
2241 if (dev != NULL)
2242 packet_dev_mc(dev, ml, -1);
2243 kfree(ml);
2244 }
2245 rtnl_unlock();
2246 }
2247
2248 static int
2249 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
2250 {
2251 struct sock *sk = sock->sk;
2252 struct packet_sock *po = pkt_sk(sk);
2253 int ret;
2254
2255 if (level != SOL_PACKET)
2256 return -ENOPROTOOPT;
2257
2258 switch (optname) {
2259 case PACKET_ADD_MEMBERSHIP:
2260 case PACKET_DROP_MEMBERSHIP:
2261 {
2262 struct packet_mreq_max mreq;
2263 int len = optlen;
2264 memset(&mreq, 0, sizeof(mreq));
2265 if (len < sizeof(struct packet_mreq))
2266 return -EINVAL;
2267 if (len > sizeof(mreq))
2268 len = sizeof(mreq);
2269 if (copy_from_user(&mreq, optval, len))
2270 return -EFAULT;
2271 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
2272 return -EINVAL;
2273 if (optname == PACKET_ADD_MEMBERSHIP)
2274 ret = packet_mc_add(sk, &mreq);
2275 else
2276 ret = packet_mc_drop(sk, &mreq);
2277 return ret;
2278 }
2279
2280 case PACKET_RX_RING:
2281 case PACKET_TX_RING:
2282 {
2283 struct tpacket_req req;
2284
2285 if (optlen < sizeof(req))
2286 return -EINVAL;
2287 if (pkt_sk(sk)->has_vnet_hdr)
2288 return -EINVAL;
2289 if (copy_from_user(&req, optval, sizeof(req)))
2290 return -EFAULT;
2291 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
2292 }
2293 case PACKET_COPY_THRESH:
2294 {
2295 int val;
2296
2297 if (optlen != sizeof(val))
2298 return -EINVAL;
2299 if (copy_from_user(&val, optval, sizeof(val)))
2300 return -EFAULT;
2301
2302 pkt_sk(sk)->copy_thresh = val;
2303 return 0;
2304 }
2305 case PACKET_VERSION:
2306 {
2307 int val;
2308
2309 if (optlen != sizeof(val))
2310 return -EINVAL;
2311 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2312 return -EBUSY;
2313 if (copy_from_user(&val, optval, sizeof(val)))
2314 return -EFAULT;
2315 switch (val) {
2316 case TPACKET_V1:
2317 case TPACKET_V2:
2318 po->tp_version = val;
2319 return 0;
2320 default:
2321 return -EINVAL;
2322 }
2323 }
2324 case PACKET_RESERVE:
2325 {
2326 unsigned int val;
2327
2328 if (optlen != sizeof(val))
2329 return -EINVAL;
2330 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2331 return -EBUSY;
2332 if (copy_from_user(&val, optval, sizeof(val)))
2333 return -EFAULT;
2334 po->tp_reserve = val;
2335 return 0;
2336 }
2337 case PACKET_LOSS:
2338 {
2339 unsigned int val;
2340
2341 if (optlen != sizeof(val))
2342 return -EINVAL;
2343 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2344 return -EBUSY;
2345 if (copy_from_user(&val, optval, sizeof(val)))
2346 return -EFAULT;
2347 po->tp_loss = !!val;
2348 return 0;
2349 }
2350 case PACKET_AUXDATA:
2351 {
2352 int val;
2353
2354 if (optlen < sizeof(val))
2355 return -EINVAL;
2356 if (copy_from_user(&val, optval, sizeof(val)))
2357 return -EFAULT;
2358
2359 po->auxdata = !!val;
2360 return 0;
2361 }
2362 case PACKET_ORIGDEV:
2363 {
2364 int val;
2365
2366 if (optlen < sizeof(val))
2367 return -EINVAL;
2368 if (copy_from_user(&val, optval, sizeof(val)))
2369 return -EFAULT;
2370
2371 po->origdev = !!val;
2372 return 0;
2373 }
2374 case PACKET_VNET_HDR:
2375 {
2376 int val;
2377
2378 if (sock->type != SOCK_RAW)
2379 return -EINVAL;
2380 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2381 return -EBUSY;
2382 if (optlen < sizeof(val))
2383 return -EINVAL;
2384 if (copy_from_user(&val, optval, sizeof(val)))
2385 return -EFAULT;
2386
2387 po->has_vnet_hdr = !!val;
2388 return 0;
2389 }
2390 case PACKET_TIMESTAMP:
2391 {
2392 int val;
2393
2394 if (optlen != sizeof(val))
2395 return -EINVAL;
2396 if (copy_from_user(&val, optval, sizeof(val)))
2397 return -EFAULT;
2398
2399 po->tp_tstamp = val;
2400 return 0;
2401 }
2402 case PACKET_FANOUT:
2403 {
2404 int val;
2405
2406 if (optlen != sizeof(val))
2407 return -EINVAL;
2408 if (copy_from_user(&val, optval, sizeof(val)))
2409 return -EFAULT;
2410
2411 return fanout_add(sk, val & 0xffff, val >> 16);
2412 }
2413 default:
2414 return -ENOPROTOOPT;
2415 }
2416 }
2417
2418 static int packet_getsockopt(struct socket *sock, int level, int optname,
2419 char __user *optval, int __user *optlen)
2420 {
2421 int len;
2422 int val;
2423 struct sock *sk = sock->sk;
2424 struct packet_sock *po = pkt_sk(sk);
2425 void *data;
2426 struct tpacket_stats st;
2427
2428 if (level != SOL_PACKET)
2429 return -ENOPROTOOPT;
2430
2431 if (get_user(len, optlen))
2432 return -EFAULT;
2433
2434 if (len < 0)
2435 return -EINVAL;
2436
2437 switch (optname) {
2438 case PACKET_STATISTICS:
2439 if (len > sizeof(struct tpacket_stats))
2440 len = sizeof(struct tpacket_stats);
2441 spin_lock_bh(&sk->sk_receive_queue.lock);
2442 st = po->stats;
2443 memset(&po->stats, 0, sizeof(st));
2444 spin_unlock_bh(&sk->sk_receive_queue.lock);
2445 st.tp_packets += st.tp_drops;
2446
2447 data = &st;
2448 break;
2449 case PACKET_AUXDATA:
2450 if (len > sizeof(int))
2451 len = sizeof(int);
2452 val = po->auxdata;
2453
2454 data = &val;
2455 break;
2456 case PACKET_ORIGDEV:
2457 if (len > sizeof(int))
2458 len = sizeof(int);
2459 val = po->origdev;
2460
2461 data = &val;
2462 break;
2463 case PACKET_VNET_HDR:
2464 if (len > sizeof(int))
2465 len = sizeof(int);
2466 val = po->has_vnet_hdr;
2467
2468 data = &val;
2469 break;
2470 case PACKET_VERSION:
2471 if (len > sizeof(int))
2472 len = sizeof(int);
2473 val = po->tp_version;
2474 data = &val;
2475 break;
2476 case PACKET_HDRLEN:
2477 if (len > sizeof(int))
2478 len = sizeof(int);
2479 if (copy_from_user(&val, optval, len))
2480 return -EFAULT;
2481 switch (val) {
2482 case TPACKET_V1:
2483 val = sizeof(struct tpacket_hdr);
2484 break;
2485 case TPACKET_V2:
2486 val = sizeof(struct tpacket2_hdr);
2487 break;
2488 default:
2489 return -EINVAL;
2490 }
2491 data = &val;
2492 break;
2493 case PACKET_RESERVE:
2494 if (len > sizeof(unsigned int))
2495 len = sizeof(unsigned int);
2496 val = po->tp_reserve;
2497 data = &val;
2498 break;
2499 case PACKET_LOSS:
2500 if (len > sizeof(unsigned int))
2501 len = sizeof(unsigned int);
2502 val = po->tp_loss;
2503 data = &val;
2504 break;
2505 case PACKET_TIMESTAMP:
2506 if (len > sizeof(int))
2507 len = sizeof(int);
2508 val = po->tp_tstamp;
2509 data = &val;
2510 break;
2511 case PACKET_FANOUT:
2512 if (len > sizeof(int))
2513 len = sizeof(int);
2514 val = (po->fanout ?
2515 ((u32)po->fanout->id |
2516 ((u32)po->fanout->type << 16)) :
2517 0);
2518 data = &val;
2519 break;
2520 default:
2521 return -ENOPROTOOPT;
2522 }
2523
2524 if (put_user(len, optlen))
2525 return -EFAULT;
2526 if (copy_to_user(optval, data, len))
2527 return -EFAULT;
2528 return 0;
2529 }
2530
2531
2532 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
2533 {
2534 struct sock *sk;
2535 struct hlist_node *node;
2536 struct net_device *dev = data;
2537 struct net *net = dev_net(dev);
2538
2539 rcu_read_lock();
2540 sk_for_each_rcu(sk, node, &net->packet.sklist) {
2541 struct packet_sock *po = pkt_sk(sk);
2542
2543 switch (msg) {
2544 case NETDEV_UNREGISTER:
2545 if (po->mclist)
2546 packet_dev_mclist(dev, po->mclist, -1);
2547 /* fallthrough */
2548
2549 case NETDEV_DOWN:
2550 if (dev->ifindex == po->ifindex) {
2551 spin_lock(&po->bind_lock);
2552 if (po->running) {
2553 __unregister_prot_hook(sk, false);
2554 sk->sk_err = ENETDOWN;
2555 if (!sock_flag(sk, SOCK_DEAD))
2556 sk->sk_error_report(sk);
2557 }
2558 if (msg == NETDEV_UNREGISTER) {
2559 po->ifindex = -1;
2560 if (po->prot_hook.dev)
2561 dev_put(po->prot_hook.dev);
2562 po->prot_hook.dev = NULL;
2563 }
2564 spin_unlock(&po->bind_lock);
2565 }
2566 break;
2567 case NETDEV_UP:
2568 if (dev->ifindex == po->ifindex) {
2569 spin_lock(&po->bind_lock);
2570 if (po->num)
2571 register_prot_hook(sk);
2572 spin_unlock(&po->bind_lock);
2573 }
2574 break;
2575 }
2576 }
2577 rcu_read_unlock();
2578 return NOTIFY_DONE;
2579 }
2580
2581
2582 static int packet_ioctl(struct socket *sock, unsigned int cmd,
2583 unsigned long arg)
2584 {
2585 struct sock *sk = sock->sk;
2586
2587 switch (cmd) {
2588 case SIOCOUTQ:
2589 {
2590 int amount = sk_wmem_alloc_get(sk);
2591
2592 return put_user(amount, (int __user *)arg);
2593 }
2594 case SIOCINQ:
2595 {
2596 struct sk_buff *skb;
2597 int amount = 0;
2598
2599 spin_lock_bh(&sk->sk_receive_queue.lock);
2600 skb = skb_peek(&sk->sk_receive_queue);
2601 if (skb)
2602 amount = skb->len;
2603 spin_unlock_bh(&sk->sk_receive_queue.lock);
2604 return put_user(amount, (int __user *)arg);
2605 }
2606 case SIOCGSTAMP:
2607 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2608 case SIOCGSTAMPNS:
2609 return sock_get_timestampns(sk, (struct timespec __user *)arg);
2610
2611 #ifdef CONFIG_INET
2612 case SIOCADDRT:
2613 case SIOCDELRT:
2614 case SIOCDARP:
2615 case SIOCGARP:
2616 case SIOCSARP:
2617 case SIOCGIFADDR:
2618 case SIOCSIFADDR:
2619 case SIOCGIFBRDADDR:
2620 case SIOCSIFBRDADDR:
2621 case SIOCGIFNETMASK:
2622 case SIOCSIFNETMASK:
2623 case SIOCGIFDSTADDR:
2624 case SIOCSIFDSTADDR:
2625 case SIOCSIFFLAGS:
2626 return inet_dgram_ops.ioctl(sock, cmd, arg);
2627 #endif
2628
2629 default:
2630 return -ENOIOCTLCMD;
2631 }
2632 return 0;
2633 }
2634
2635 static unsigned int packet_poll(struct file *file, struct socket *sock,
2636 poll_table *wait)
2637 {
2638 struct sock *sk = sock->sk;
2639 struct packet_sock *po = pkt_sk(sk);
2640 unsigned int mask = datagram_poll(file, sock, wait);
2641
2642 spin_lock_bh(&sk->sk_receive_queue.lock);
2643 if (po->rx_ring.pg_vec) {
2644 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
2645 mask |= POLLIN | POLLRDNORM;
2646 }
2647 spin_unlock_bh(&sk->sk_receive_queue.lock);
2648 spin_lock_bh(&sk->sk_write_queue.lock);
2649 if (po->tx_ring.pg_vec) {
2650 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2651 mask |= POLLOUT | POLLWRNORM;
2652 }
2653 spin_unlock_bh(&sk->sk_write_queue.lock);
2654 return mask;
2655 }
2656
2657
2658 /* Dirty? Well, I still did not learn better way to account
2659 * for user mmaps.
2660 */
2661
2662 static void packet_mm_open(struct vm_area_struct *vma)
2663 {
2664 struct file *file = vma->vm_file;
2665 struct socket *sock = file->private_data;
2666 struct sock *sk = sock->sk;
2667
2668 if (sk)
2669 atomic_inc(&pkt_sk(sk)->mapped);
2670 }
2671
2672 static void packet_mm_close(struct vm_area_struct *vma)
2673 {
2674 struct file *file = vma->vm_file;
2675 struct socket *sock = file->private_data;
2676 struct sock *sk = sock->sk;
2677
2678 if (sk)
2679 atomic_dec(&pkt_sk(sk)->mapped);
2680 }
2681
2682 static const struct vm_operations_struct packet_mmap_ops = {
2683 .open = packet_mm_open,
2684 .close = packet_mm_close,
2685 };
2686
2687 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
2688 unsigned int len)
2689 {
2690 int i;
2691
2692 for (i = 0; i < len; i++) {
2693 if (likely(pg_vec[i].buffer)) {
2694 if (is_vmalloc_addr(pg_vec[i].buffer))
2695 vfree(pg_vec[i].buffer);
2696 else
2697 free_pages((unsigned long)pg_vec[i].buffer,
2698 order);
2699 pg_vec[i].buffer = NULL;
2700 }
2701 }
2702 kfree(pg_vec);
2703 }
2704
2705 static inline char *alloc_one_pg_vec_page(unsigned long order)
2706 {
2707 char *buffer = NULL;
2708 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
2709 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
2710
2711 buffer = (char *) __get_free_pages(gfp_flags, order);
2712
2713 if (buffer)
2714 return buffer;
2715
2716 /*
2717 * __get_free_pages failed, fall back to vmalloc
2718 */
2719 buffer = vzalloc((1 << order) * PAGE_SIZE);
2720
2721 if (buffer)
2722 return buffer;
2723
2724 /*
2725 * vmalloc failed, lets dig into swap here
2726 */
2727 gfp_flags &= ~__GFP_NORETRY;
2728 buffer = (char *)__get_free_pages(gfp_flags, order);
2729 if (buffer)
2730 return buffer;
2731
2732 /*
2733 * complete and utter failure
2734 */
2735 return NULL;
2736 }
2737
2738 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
2739 {
2740 unsigned int block_nr = req->tp_block_nr;
2741 struct pgv *pg_vec;
2742 int i;
2743
2744 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
2745 if (unlikely(!pg_vec))
2746 goto out;
2747
2748 for (i = 0; i < block_nr; i++) {
2749 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
2750 if (unlikely(!pg_vec[i].buffer))
2751 goto out_free_pgvec;
2752 }
2753
2754 out:
2755 return pg_vec;
2756
2757 out_free_pgvec:
2758 free_pg_vec(pg_vec, order, block_nr);
2759 pg_vec = NULL;
2760 goto out;
2761 }
2762
2763 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2764 int closing, int tx_ring)
2765 {
2766 struct pgv *pg_vec = NULL;
2767 struct packet_sock *po = pkt_sk(sk);
2768 int was_running, order = 0;
2769 struct packet_ring_buffer *rb;
2770 struct sk_buff_head *rb_queue;
2771 __be16 num;
2772 int err;
2773
2774 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2775 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2776
2777 err = -EBUSY;
2778 if (!closing) {
2779 if (atomic_read(&po->mapped))
2780 goto out;
2781 if (atomic_read(&rb->pending))
2782 goto out;
2783 }
2784
2785 if (req->tp_block_nr) {
2786 /* Sanity tests and some calculations */
2787 err = -EBUSY;
2788 if (unlikely(rb->pg_vec))
2789 goto out;
2790
2791 switch (po->tp_version) {
2792 case TPACKET_V1:
2793 po->tp_hdrlen = TPACKET_HDRLEN;
2794 break;
2795 case TPACKET_V2:
2796 po->tp_hdrlen = TPACKET2_HDRLEN;
2797 break;
2798 }
2799
2800 err = -EINVAL;
2801 if (unlikely((int)req->tp_block_size <= 0))
2802 goto out;
2803 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
2804 goto out;
2805 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
2806 po->tp_reserve))
2807 goto out;
2808 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
2809 goto out;
2810
2811 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2812 if (unlikely(rb->frames_per_block <= 0))
2813 goto out;
2814 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2815 req->tp_frame_nr))
2816 goto out;
2817
2818 err = -ENOMEM;
2819 order = get_order(req->tp_block_size);
2820 pg_vec = alloc_pg_vec(req, order);
2821 if (unlikely(!pg_vec))
2822 goto out;
2823 }
2824 /* Done */
2825 else {
2826 err = -EINVAL;
2827 if (unlikely(req->tp_frame_nr))
2828 goto out;
2829 }
2830
2831 lock_sock(sk);
2832
2833 /* Detach socket from network */
2834 spin_lock(&po->bind_lock);
2835 was_running = po->running;
2836 num = po->num;
2837 if (was_running) {
2838 po->num = 0;
2839 __unregister_prot_hook(sk, false);
2840 }
2841 spin_unlock(&po->bind_lock);
2842
2843 synchronize_net();
2844
2845 err = -EBUSY;
2846 mutex_lock(&po->pg_vec_lock);
2847 if (closing || atomic_read(&po->mapped) == 0) {
2848 err = 0;
2849 spin_lock_bh(&rb_queue->lock);
2850 swap(rb->pg_vec, pg_vec);
2851 rb->frame_max = (req->tp_frame_nr - 1);
2852 rb->head = 0;
2853 rb->frame_size = req->tp_frame_size;
2854 spin_unlock_bh(&rb_queue->lock);
2855
2856 swap(rb->pg_vec_order, order);
2857 swap(rb->pg_vec_len, req->tp_block_nr);
2858
2859 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2860 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2861 tpacket_rcv : packet_rcv;
2862 skb_queue_purge(rb_queue);
2863 if (atomic_read(&po->mapped))
2864 pr_err("packet_mmap: vma is busy: %d\n",
2865 atomic_read(&po->mapped));
2866 }
2867 mutex_unlock(&po->pg_vec_lock);
2868
2869 spin_lock(&po->bind_lock);
2870 if (was_running) {
2871 po->num = num;
2872 register_prot_hook(sk);
2873 }
2874 spin_unlock(&po->bind_lock);
2875
2876 release_sock(sk);
2877
2878 if (pg_vec)
2879 free_pg_vec(pg_vec, order, req->tp_block_nr);
2880 out:
2881 return err;
2882 }
2883
2884 static int packet_mmap(struct file *file, struct socket *sock,
2885 struct vm_area_struct *vma)
2886 {
2887 struct sock *sk = sock->sk;
2888 struct packet_sock *po = pkt_sk(sk);
2889 unsigned long size, expected_size;
2890 struct packet_ring_buffer *rb;
2891 unsigned long start;
2892 int err = -EINVAL;
2893 int i;
2894
2895 if (vma->vm_pgoff)
2896 return -EINVAL;
2897
2898 mutex_lock(&po->pg_vec_lock);
2899
2900 expected_size = 0;
2901 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2902 if (rb->pg_vec) {
2903 expected_size += rb->pg_vec_len
2904 * rb->pg_vec_pages
2905 * PAGE_SIZE;
2906 }
2907 }
2908
2909 if (expected_size == 0)
2910 goto out;
2911
2912 size = vma->vm_end - vma->vm_start;
2913 if (size != expected_size)
2914 goto out;
2915
2916 start = vma->vm_start;
2917 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2918 if (rb->pg_vec == NULL)
2919 continue;
2920
2921 for (i = 0; i < rb->pg_vec_len; i++) {
2922 struct page *page;
2923 void *kaddr = rb->pg_vec[i].buffer;
2924 int pg_num;
2925
2926 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
2927 page = pgv_to_page(kaddr);
2928 err = vm_insert_page(vma, start, page);
2929 if (unlikely(err))
2930 goto out;
2931 start += PAGE_SIZE;
2932 kaddr += PAGE_SIZE;
2933 }
2934 }
2935 }
2936
2937 atomic_inc(&po->mapped);
2938 vma->vm_ops = &packet_mmap_ops;
2939 err = 0;
2940
2941 out:
2942 mutex_unlock(&po->pg_vec_lock);
2943 return err;
2944 }
2945
2946 static const struct proto_ops packet_ops_spkt = {
2947 .family = PF_PACKET,
2948 .owner = THIS_MODULE,
2949 .release = packet_release,
2950 .bind = packet_bind_spkt,
2951 .connect = sock_no_connect,
2952 .socketpair = sock_no_socketpair,
2953 .accept = sock_no_accept,
2954 .getname = packet_getname_spkt,
2955 .poll = datagram_poll,
2956 .ioctl = packet_ioctl,
2957 .listen = sock_no_listen,
2958 .shutdown = sock_no_shutdown,
2959 .setsockopt = sock_no_setsockopt,
2960 .getsockopt = sock_no_getsockopt,
2961 .sendmsg = packet_sendmsg_spkt,
2962 .recvmsg = packet_recvmsg,
2963 .mmap = sock_no_mmap,
2964 .sendpage = sock_no_sendpage,
2965 };
2966
2967 static const struct proto_ops packet_ops = {
2968 .family = PF_PACKET,
2969 .owner = THIS_MODULE,
2970 .release = packet_release,
2971 .bind = packet_bind,
2972 .connect = sock_no_connect,
2973 .socketpair = sock_no_socketpair,
2974 .accept = sock_no_accept,
2975 .getname = packet_getname,
2976 .poll = packet_poll,
2977 .ioctl = packet_ioctl,
2978 .listen = sock_no_listen,
2979 .shutdown = sock_no_shutdown,
2980 .setsockopt = packet_setsockopt,
2981 .getsockopt = packet_getsockopt,
2982 .sendmsg = packet_sendmsg,
2983 .recvmsg = packet_recvmsg,
2984 .mmap = packet_mmap,
2985 .sendpage = sock_no_sendpage,
2986 };
2987
2988 static const struct net_proto_family packet_family_ops = {
2989 .family = PF_PACKET,
2990 .create = packet_create,
2991 .owner = THIS_MODULE,
2992 };
2993
2994 static struct notifier_block packet_netdev_notifier = {
2995 .notifier_call = packet_notifier,
2996 };
2997
2998 #ifdef CONFIG_PROC_FS
2999
3000 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
3001 __acquires(RCU)
3002 {
3003 struct net *net = seq_file_net(seq);
3004
3005 rcu_read_lock();
3006 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
3007 }
3008
3009 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3010 {
3011 struct net *net = seq_file_net(seq);
3012 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
3013 }
3014
3015 static void packet_seq_stop(struct seq_file *seq, void *v)
3016 __releases(RCU)
3017 {
3018 rcu_read_unlock();
3019 }
3020
3021 static int packet_seq_show(struct seq_file *seq, void *v)
3022 {
3023 if (v == SEQ_START_TOKEN)
3024 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
3025 else {
3026 struct sock *s = sk_entry(v);
3027 const struct packet_sock *po = pkt_sk(s);
3028
3029 seq_printf(seq,
3030 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
3031 s,
3032 atomic_read(&s->sk_refcnt),
3033 s->sk_type,
3034 ntohs(po->num),
3035 po->ifindex,
3036 po->running,
3037 atomic_read(&s->sk_rmem_alloc),
3038 sock_i_uid(s),
3039 sock_i_ino(s));
3040 }
3041
3042 return 0;
3043 }
3044
3045 static const struct seq_operations packet_seq_ops = {
3046 .start = packet_seq_start,
3047 .next = packet_seq_next,
3048 .stop = packet_seq_stop,
3049 .show = packet_seq_show,
3050 };
3051
3052 static int packet_seq_open(struct inode *inode, struct file *file)
3053 {
3054 return seq_open_net(inode, file, &packet_seq_ops,
3055 sizeof(struct seq_net_private));
3056 }
3057
3058 static const struct file_operations packet_seq_fops = {
3059 .owner = THIS_MODULE,
3060 .open = packet_seq_open,
3061 .read = seq_read,
3062 .llseek = seq_lseek,
3063 .release = seq_release_net,
3064 };
3065
3066 #endif
3067
3068 static int __net_init packet_net_init(struct net *net)
3069 {
3070 spin_lock_init(&net->packet.sklist_lock);
3071 INIT_HLIST_HEAD(&net->packet.sklist);
3072
3073 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
3074 return -ENOMEM;
3075
3076 return 0;
3077 }
3078
3079 static void __net_exit packet_net_exit(struct net *net)
3080 {
3081 proc_net_remove(net, "packet");
3082 }
3083
3084 static struct pernet_operations packet_net_ops = {
3085 .init = packet_net_init,
3086 .exit = packet_net_exit,
3087 };
3088
3089
3090 static void __exit packet_exit(void)
3091 {
3092 unregister_netdevice_notifier(&packet_netdev_notifier);
3093 unregister_pernet_subsys(&packet_net_ops);
3094 sock_unregister(PF_PACKET);
3095 proto_unregister(&packet_proto);
3096 }
3097
3098 static int __init packet_init(void)
3099 {
3100 int rc = proto_register(&packet_proto, 0);
3101
3102 if (rc != 0)
3103 goto out;
3104
3105 sock_register(&packet_family_ops);
3106 register_pernet_subsys(&packet_net_ops);
3107 register_netdevice_notifier(&packet_netdev_notifier);
3108 out:
3109 return rc;
3110 }
3111
3112 module_init(packet_init);
3113 module_exit(packet_exit);
3114 MODULE_LICENSE("GPL");
3115 MODULE_ALIAS_NETPROTO(PF_PACKET);
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