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[NET]: Make /proc/net per network namespace
[linux-2.6/kmemtrace.git] / net / packet / af_packet.c
blob56502292f24c99677963cfb6a774539081d41a19
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 * Version: $Id: af_packet.c,v 1.61 2002/02/08 03:57:19 davem Exp $
9 *
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Alan Cox, <gw4pts@gw4pts.ampr.org>
13 *
14 * Fixes:
15 * Alan Cox : verify_area() now used correctly
16 * Alan Cox : new skbuff lists, look ma no backlogs!
17 * Alan Cox : tidied skbuff lists.
18 * Alan Cox : Now uses generic datagram routines I
19 * added. Also fixed the peek/read crash
20 * from all old Linux datagram code.
21 * Alan Cox : Uses the improved datagram code.
22 * Alan Cox : Added NULL's for socket options.
23 * Alan Cox : Re-commented the code.
24 * Alan Cox : Use new kernel side addressing
25 * Rob Janssen : Correct MTU usage.
26 * Dave Platt : Counter leaks caused by incorrect
27 * interrupt locking and some slightly
28 * dubious gcc output. Can you read
29 * compiler: it said _VOLATILE_
30 * Richard Kooijman : Timestamp fixes.
31 * Alan Cox : New buffers. Use sk->mac.raw.
32 * Alan Cox : sendmsg/recvmsg support.
33 * Alan Cox : Protocol setting support
34 * Alexey Kuznetsov : Untied from IPv4 stack.
35 * Cyrus Durgin : Fixed kerneld for kmod.
36 * Michal Ostrowski : Module initialization cleanup.
37 * Ulises Alonso : Frame number limit removal and
38 * packet_set_ring memory leak.
39 * Eric Biederman : Allow for > 8 byte hardware addresses.
40 * The convention is that longer addresses
41 * will simply extend the hardware address
42 * byte arrays at the end of sockaddr_ll
43 * and packet_mreq.
44 *
45 * This program is free software; you can redistribute it and/or
46 * modify it under the terms of the GNU General Public License
47 * as published by the Free Software Foundation; either version
48 * 2 of the License, or (at your option) any later version.
49 *
50 */
51
52 #include <linux/types.h>
53 #include <linux/mm.h>
54 #include <linux/capability.h>
55 #include <linux/fcntl.h>
56 #include <linux/socket.h>
57 #include <linux/in.h>
58 #include <linux/inet.h>
59 #include <linux/netdevice.h>
60 #include <linux/if_packet.h>
61 #include <linux/wireless.h>
62 #include <linux/kernel.h>
63 #include <linux/kmod.h>
64 #include <net/net_namespace.h>
65 #include <net/ip.h>
66 #include <net/protocol.h>
67 #include <linux/skbuff.h>
68 #include <net/sock.h>
69 #include <linux/errno.h>
70 #include <linux/timer.h>
71 #include <asm/system.h>
72 #include <asm/uaccess.h>
73 #include <asm/ioctls.h>
74 #include <asm/page.h>
75 #include <asm/cacheflush.h>
76 #include <asm/io.h>
77 #include <linux/proc_fs.h>
78 #include <linux/seq_file.h>
79 #include <linux/poll.h>
80 #include <linux/module.h>
81 #include <linux/init.h>
82
83 #ifdef CONFIG_INET
84 #include <net/inet_common.h>
85 #endif
86
87 /*
88 Assumptions:
89 - if device has no dev->hard_header routine, it adds and removes ll header
90 inside itself. In this case ll header is invisible outside of device,
91 but higher levels still should reserve dev->hard_header_len.
92 Some devices are enough clever to reallocate skb, when header
93 will not fit to reserved space (tunnel), another ones are silly
94 (PPP).
95 - packet socket receives packets with pulled ll header,
96 so that SOCK_RAW should push it back.
97
98 On receive:
99 -----------
100
101 Incoming, dev->hard_header!=NULL
102 mac_header -> ll header
103 data -> data
104
105 Outgoing, dev->hard_header!=NULL
106 mac_header -> ll header
107 data -> ll header
108
109 Incoming, dev->hard_header==NULL
110 mac_header -> UNKNOWN position. It is very likely, that it points to ll
111 header. PPP makes it, that is wrong, because introduce
112 assymetry between rx and tx paths.
113 data -> data
114
115 Outgoing, dev->hard_header==NULL
116 mac_header -> data. ll header is still not built!
117 data -> data
118
119 Resume
120 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
121
122
123 On transmit:
124 ------------
125
126 dev->hard_header != NULL
127 mac_header -> ll header
128 data -> ll header
129
130 dev->hard_header == NULL (ll header is added by device, we cannot control it)
131 mac_header -> data
132 data -> data
133
134 We should set nh.raw on output to correct posistion,
135 packet classifier depends on it.
136 */
137
138 /* List of all packet sockets. */
139 static HLIST_HEAD(packet_sklist);
140 static DEFINE_RWLOCK(packet_sklist_lock);
141
142 static atomic_t packet_socks_nr;
143
144
145 /* Private packet socket structures. */
146
147 struct packet_mclist
148 {
149 struct packet_mclist *next;
150 int ifindex;
151 int count;
152 unsigned short type;
153 unsigned short alen;
154 unsigned char addr[MAX_ADDR_LEN];
155 };
156 /* identical to struct packet_mreq except it has
157 * a longer address field.
158 */
159 struct packet_mreq_max
160 {
161 int mr_ifindex;
162 unsigned short mr_type;
163 unsigned short mr_alen;
164 unsigned char mr_address[MAX_ADDR_LEN];
165 };
166
167 #ifdef CONFIG_PACKET_MMAP
168 static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing);
169 #endif
170
171 static void packet_flush_mclist(struct sock *sk);
172
173 struct packet_sock {
174 /* struct sock has to be the first member of packet_sock */
175 struct sock sk;
176 struct tpacket_stats stats;
177 #ifdef CONFIG_PACKET_MMAP
178 char * *pg_vec;
179 unsigned int head;
180 unsigned int frames_per_block;
181 unsigned int frame_size;
182 unsigned int frame_max;
183 int copy_thresh;
184 #endif
185 struct packet_type prot_hook;
186 spinlock_t bind_lock;
187 unsigned int running:1, /* prot_hook is attached*/
188 auxdata:1,
189 origdev:1;
190 int ifindex; /* bound device */
191 __be16 num;
192 struct packet_mclist *mclist;
193 #ifdef CONFIG_PACKET_MMAP
194 atomic_t mapped;
195 unsigned int pg_vec_order;
196 unsigned int pg_vec_pages;
197 unsigned int pg_vec_len;
198 #endif
199 };
200
201 struct packet_skb_cb {
202 unsigned int origlen;
203 union {
204 struct sockaddr_pkt pkt;
205 struct sockaddr_ll ll;
206 } sa;
207 };
208
209 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
210
211 #ifdef CONFIG_PACKET_MMAP
212
213 static inline struct tpacket_hdr *packet_lookup_frame(struct packet_sock *po, unsigned int position)
214 {
215 unsigned int pg_vec_pos, frame_offset;
216
217 pg_vec_pos = position / po->frames_per_block;
218 frame_offset = position % po->frames_per_block;
219
220 return (struct tpacket_hdr *)(po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size));
221 }
222 #endif
223
224 static inline struct packet_sock *pkt_sk(struct sock *sk)
225 {
226 return (struct packet_sock *)sk;
227 }
228
229 static void packet_sock_destruct(struct sock *sk)
230 {
231 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
232 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
233
234 if (!sock_flag(sk, SOCK_DEAD)) {
235 printk("Attempt to release alive packet socket: %p\n", sk);
236 return;
237 }
238
239 atomic_dec(&packet_socks_nr);
240 #ifdef PACKET_REFCNT_DEBUG
241 printk(KERN_DEBUG "PACKET socket %p is free, %d are alive\n", sk, atomic_read(&packet_socks_nr));
242 #endif
243 }
244
245
246 static const struct proto_ops packet_ops;
247
248 static const struct proto_ops packet_ops_spkt;
249
250 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
251 {
252 struct sock *sk;
253 struct sockaddr_pkt *spkt;
254
255 /*
256 * When we registered the protocol we saved the socket in the data
257 * field for just this event.
258 */
259
260 sk = pt->af_packet_priv;
261
262 /*
263 * Yank back the headers [hope the device set this
264 * right or kerboom...]
265 *
266 * Incoming packets have ll header pulled,
267 * push it back.
268 *
269 * For outgoing ones skb->data == skb_mac_header(skb)
270 * so that this procedure is noop.
271 */
272
273 if (skb->pkt_type == PACKET_LOOPBACK)
274 goto out;
275
276 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
277 goto oom;
278
279 /* drop any routing info */
280 dst_release(skb->dst);
281 skb->dst = NULL;
282
283 /* drop conntrack reference */
284 nf_reset(skb);
285
286 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
287
288 skb_push(skb, skb->data - skb_mac_header(skb));
289
290 /*
291 * The SOCK_PACKET socket receives _all_ frames.
292 */
293
294 spkt->spkt_family = dev->type;
295 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
296 spkt->spkt_protocol = skb->protocol;
297
298 /*
299 * Charge the memory to the socket. This is done specifically
300 * to prevent sockets using all the memory up.
301 */
302
303 if (sock_queue_rcv_skb(sk,skb) == 0)
304 return 0;
305
306 out:
307 kfree_skb(skb);
308 oom:
309 return 0;
310 }
311
312
313 /*
314 * Output a raw packet to a device layer. This bypasses all the other
315 * protocol layers and you must therefore supply it with a complete frame
316 */
317
318 static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
319 struct msghdr *msg, size_t len)
320 {
321 struct sock *sk = sock->sk;
322 struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name;
323 struct sk_buff *skb;
324 struct net_device *dev;
325 __be16 proto=0;
326 int err;
327
328 /*
329 * Get and verify the address.
330 */
331
332 if (saddr)
333 {
334 if (msg->msg_namelen < sizeof(struct sockaddr))
335 return(-EINVAL);
336 if (msg->msg_namelen==sizeof(struct sockaddr_pkt))
337 proto=saddr->spkt_protocol;
338 }
339 else
340 return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */
341
342 /*
343 * Find the device first to size check it
344 */
345
346 saddr->spkt_device[13] = 0;
347 dev = dev_get_by_name(saddr->spkt_device);
348 err = -ENODEV;
349 if (dev == NULL)
350 goto out_unlock;
351
352 err = -ENETDOWN;
353 if (!(dev->flags & IFF_UP))
354 goto out_unlock;
355
356 /*
357 * You may not queue a frame bigger than the mtu. This is the lowest level
358 * raw protocol and you must do your own fragmentation at this level.
359 */
360
361 err = -EMSGSIZE;
362 if (len > dev->mtu + dev->hard_header_len)
363 goto out_unlock;
364
365 err = -ENOBUFS;
366 skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);
367
368 /*
369 * If the write buffer is full, then tough. At this level the user gets to
370 * deal with the problem - do your own algorithmic backoffs. That's far
371 * more flexible.
372 */
373
374 if (skb == NULL)
375 goto out_unlock;
376
377 /*
378 * Fill it in
379 */
380
381 /* FIXME: Save some space for broken drivers that write a
382 * hard header at transmission time by themselves. PPP is the
383 * notable one here. This should really be fixed at the driver level.
384 */
385 skb_reserve(skb, LL_RESERVED_SPACE(dev));
386 skb_reset_network_header(skb);
387
388 /* Try to align data part correctly */
389 if (dev->hard_header) {
390 skb->data -= dev->hard_header_len;
391 skb->tail -= dev->hard_header_len;
392 if (len < dev->hard_header_len)
393 skb_reset_network_header(skb);
394 }
395
396 /* Returns -EFAULT on error */
397 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
398 skb->protocol = proto;
399 skb->dev = dev;
400 skb->priority = sk->sk_priority;
401 if (err)
402 goto out_free;
403
404 /*
405 * Now send it
406 */
407
408 dev_queue_xmit(skb);
409 dev_put(dev);
410 return(len);
411
412 out_free:
413 kfree_skb(skb);
414 out_unlock:
415 if (dev)
416 dev_put(dev);
417 return err;
418 }
419
420 static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
421 unsigned int res)
422 {
423 struct sk_filter *filter;
424
425 rcu_read_lock_bh();
426 filter = rcu_dereference(sk->sk_filter);
427 if (filter != NULL)
428 res = sk_run_filter(skb, filter->insns, filter->len);
429 rcu_read_unlock_bh();
430
431 return res;
432 }
433
434 /*
435 This function makes lazy skb cloning in hope that most of packets
436 are discarded by BPF.
437
438 Note tricky part: we DO mangle shared skb! skb->data, skb->len
439 and skb->cb are mangled. It works because (and until) packets
440 falling here are owned by current CPU. Output packets are cloned
441 by dev_queue_xmit_nit(), input packets are processed by net_bh
442 sequencially, so that if we return skb to original state on exit,
443 we will not harm anyone.
444 */
445
446 static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
447 {
448 struct sock *sk;
449 struct sockaddr_ll *sll;
450 struct packet_sock *po;
451 u8 * skb_head = skb->data;
452 int skb_len = skb->len;
453 unsigned int snaplen, res;
454
455 if (skb->pkt_type == PACKET_LOOPBACK)
456 goto drop;
457
458 sk = pt->af_packet_priv;
459 po = pkt_sk(sk);
460
461 skb->dev = dev;
462
463 if (dev->hard_header) {
464 /* The device has an explicit notion of ll header,
465 exported to higher levels.
466
467 Otherwise, the device hides datails of it frame
468 structure, so that corresponding packet head
469 never delivered to user.
470 */
471 if (sk->sk_type != SOCK_DGRAM)
472 skb_push(skb, skb->data - skb_mac_header(skb));
473 else if (skb->pkt_type == PACKET_OUTGOING) {
474 /* Special case: outgoing packets have ll header at head */
475 skb_pull(skb, skb_network_offset(skb));
476 }
477 }
478
479 snaplen = skb->len;
480
481 res = run_filter(skb, sk, snaplen);
482 if (!res)
483 goto drop_n_restore;
484 if (snaplen > res)
485 snaplen = res;
486
487 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
488 (unsigned)sk->sk_rcvbuf)
489 goto drop_n_acct;
490
491 if (skb_shared(skb)) {
492 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
493 if (nskb == NULL)
494 goto drop_n_acct;
495
496 if (skb_head != skb->data) {
497 skb->data = skb_head;
498 skb->len = skb_len;
499 }
500 kfree_skb(skb);
501 skb = nskb;
502 }
503
504 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
505 sizeof(skb->cb));
506
507 sll = &PACKET_SKB_CB(skb)->sa.ll;
508 sll->sll_family = AF_PACKET;
509 sll->sll_hatype = dev->type;
510 sll->sll_protocol = skb->protocol;
511 sll->sll_pkttype = skb->pkt_type;
512 if (unlikely(po->origdev) && skb->pkt_type == PACKET_HOST)
513 sll->sll_ifindex = orig_dev->ifindex;
514 else
515 sll->sll_ifindex = dev->ifindex;
516 sll->sll_halen = 0;
517
518 if (dev->hard_header_parse)
519 sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr);
520
521 PACKET_SKB_CB(skb)->origlen = skb->len;
522
523 if (pskb_trim(skb, snaplen))
524 goto drop_n_acct;
525
526 skb_set_owner_r(skb, sk);
527 skb->dev = NULL;
528 dst_release(skb->dst);
529 skb->dst = NULL;
530
531 /* drop conntrack reference */
532 nf_reset(skb);
533
534 spin_lock(&sk->sk_receive_queue.lock);
535 po->stats.tp_packets++;
536 __skb_queue_tail(&sk->sk_receive_queue, skb);
537 spin_unlock(&sk->sk_receive_queue.lock);
538 sk->sk_data_ready(sk, skb->len);
539 return 0;
540
541 drop_n_acct:
542 spin_lock(&sk->sk_receive_queue.lock);
543 po->stats.tp_drops++;
544 spin_unlock(&sk->sk_receive_queue.lock);
545
546 drop_n_restore:
547 if (skb_head != skb->data && skb_shared(skb)) {
548 skb->data = skb_head;
549 skb->len = skb_len;
550 }
551 drop:
552 kfree_skb(skb);
553 return 0;
554 }
555
556 #ifdef CONFIG_PACKET_MMAP
557 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
558 {
559 struct sock *sk;
560 struct packet_sock *po;
561 struct sockaddr_ll *sll;
562 struct tpacket_hdr *h;
563 u8 * skb_head = skb->data;
564 int skb_len = skb->len;
565 unsigned int snaplen, res;
566 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
567 unsigned short macoff, netoff;
568 struct sk_buff *copy_skb = NULL;
569 struct timeval tv;
570
571 if (skb->pkt_type == PACKET_LOOPBACK)
572 goto drop;
573
574 sk = pt->af_packet_priv;
575 po = pkt_sk(sk);
576
577 if (dev->hard_header) {
578 if (sk->sk_type != SOCK_DGRAM)
579 skb_push(skb, skb->data - skb_mac_header(skb));
580 else if (skb->pkt_type == PACKET_OUTGOING) {
581 /* Special case: outgoing packets have ll header at head */
582 skb_pull(skb, skb_network_offset(skb));
583 }
584 }
585
586 if (skb->ip_summed == CHECKSUM_PARTIAL)
587 status |= TP_STATUS_CSUMNOTREADY;
588
589 snaplen = skb->len;
590
591 res = run_filter(skb, sk, snaplen);
592 if (!res)
593 goto drop_n_restore;
594 if (snaplen > res)
595 snaplen = res;
596
597 if (sk->sk_type == SOCK_DGRAM) {
598 macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16;
599 } else {
600 unsigned maclen = skb_network_offset(skb);
601 netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen));
602 macoff = netoff - maclen;
603 }
604
605 if (macoff + snaplen > po->frame_size) {
606 if (po->copy_thresh &&
607 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
608 (unsigned)sk->sk_rcvbuf) {
609 if (skb_shared(skb)) {
610 copy_skb = skb_clone(skb, GFP_ATOMIC);
611 } else {
612 copy_skb = skb_get(skb);
613 skb_head = skb->data;
614 }
615 if (copy_skb)
616 skb_set_owner_r(copy_skb, sk);
617 }
618 snaplen = po->frame_size - macoff;
619 if ((int)snaplen < 0)
620 snaplen = 0;
621 }
622
623 spin_lock(&sk->sk_receive_queue.lock);
624 h = packet_lookup_frame(po, po->head);
625
626 if (h->tp_status)
627 goto ring_is_full;
628 po->head = po->head != po->frame_max ? po->head+1 : 0;
629 po->stats.tp_packets++;
630 if (copy_skb) {
631 status |= TP_STATUS_COPY;
632 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
633 }
634 if (!po->stats.tp_drops)
635 status &= ~TP_STATUS_LOSING;
636 spin_unlock(&sk->sk_receive_queue.lock);
637
638 skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen);
639
640 h->tp_len = skb->len;
641 h->tp_snaplen = snaplen;
642 h->tp_mac = macoff;
643 h->tp_net = netoff;
644 if (skb->tstamp.tv64)
645 tv = ktime_to_timeval(skb->tstamp);
646 else
647 do_gettimeofday(&tv);
648 h->tp_sec = tv.tv_sec;
649 h->tp_usec = tv.tv_usec;
650
651 sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h)));
652 sll->sll_halen = 0;
653 if (dev->hard_header_parse)
654 sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr);
655 sll->sll_family = AF_PACKET;
656 sll->sll_hatype = dev->type;
657 sll->sll_protocol = skb->protocol;
658 sll->sll_pkttype = skb->pkt_type;
659 if (unlikely(po->origdev) && skb->pkt_type == PACKET_HOST)
660 sll->sll_ifindex = orig_dev->ifindex;
661 else
662 sll->sll_ifindex = dev->ifindex;
663
664 h->tp_status = status;
665 smp_mb();
666
667 {
668 struct page *p_start, *p_end;
669 u8 *h_end = (u8 *)h + macoff + snaplen - 1;
670
671 p_start = virt_to_page(h);
672 p_end = virt_to_page(h_end);
673 while (p_start <= p_end) {
674 flush_dcache_page(p_start);
675 p_start++;
676 }
677 }
678
679 sk->sk_data_ready(sk, 0);
680
681 drop_n_restore:
682 if (skb_head != skb->data && skb_shared(skb)) {
683 skb->data = skb_head;
684 skb->len = skb_len;
685 }
686 drop:
687 kfree_skb(skb);
688 return 0;
689
690 ring_is_full:
691 po->stats.tp_drops++;
692 spin_unlock(&sk->sk_receive_queue.lock);
693
694 sk->sk_data_ready(sk, 0);
695 if (copy_skb)
696 kfree_skb(copy_skb);
697 goto drop_n_restore;
698 }
699
700 #endif
701
702
703 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
704 struct msghdr *msg, size_t len)
705 {
706 struct sock *sk = sock->sk;
707 struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name;
708 struct sk_buff *skb;
709 struct net_device *dev;
710 __be16 proto;
711 unsigned char *addr;
712 int ifindex, err, reserve = 0;
713
714 /*
715 * Get and verify the address.
716 */
717
718 if (saddr == NULL) {
719 struct packet_sock *po = pkt_sk(sk);
720
721 ifindex = po->ifindex;
722 proto = po->num;
723 addr = NULL;
724 } else {
725 err = -EINVAL;
726 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
727 goto out;
728 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
729 goto out;
730 ifindex = saddr->sll_ifindex;
731 proto = saddr->sll_protocol;
732 addr = saddr->sll_addr;
733 }
734
735
736 dev = dev_get_by_index(ifindex);
737 err = -ENXIO;
738 if (dev == NULL)
739 goto out_unlock;
740 if (sock->type == SOCK_RAW)
741 reserve = dev->hard_header_len;
742
743 err = -ENETDOWN;
744 if (!(dev->flags & IFF_UP))
745 goto out_unlock;
746
747 err = -EMSGSIZE;
748 if (len > dev->mtu+reserve)
749 goto out_unlock;
750
751 skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev),
752 msg->msg_flags & MSG_DONTWAIT, &err);
753 if (skb==NULL)
754 goto out_unlock;
755
756 skb_reserve(skb, LL_RESERVED_SPACE(dev));
757 skb_reset_network_header(skb);
758
759 if (dev->hard_header) {
760 int res;
761 err = -EINVAL;
762 res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len);
763 if (sock->type != SOCK_DGRAM) {
764 skb_reset_tail_pointer(skb);
765 skb->len = 0;
766 } else if (res < 0)
767 goto out_free;
768 }
769
770 /* Returns -EFAULT on error */
771 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
772 if (err)
773 goto out_free;
774
775 skb->protocol = proto;
776 skb->dev = dev;
777 skb->priority = sk->sk_priority;
778
779 /*
780 * Now send it
781 */
782
783 err = dev_queue_xmit(skb);
784 if (err > 0 && (err = net_xmit_errno(err)) != 0)
785 goto out_unlock;
786
787 dev_put(dev);
788
789 return(len);
790
791 out_free:
792 kfree_skb(skb);
793 out_unlock:
794 if (dev)
795 dev_put(dev);
796 out:
797 return err;
798 }
799
800 /*
801 * Close a PACKET socket. This is fairly simple. We immediately go
802 * to 'closed' state and remove our protocol entry in the device list.
803 */
804
805 static int packet_release(struct socket *sock)
806 {
807 struct sock *sk = sock->sk;
808 struct packet_sock *po;
809
810 if (!sk)
811 return 0;
812
813 po = pkt_sk(sk);
814
815 write_lock_bh(&packet_sklist_lock);
816 sk_del_node_init(sk);
817 write_unlock_bh(&packet_sklist_lock);
818
819 /*
820 * Unhook packet receive handler.
821 */
822
823 if (po->running) {
824 /*
825 * Remove the protocol hook
826 */
827 dev_remove_pack(&po->prot_hook);
828 po->running = 0;
829 po->num = 0;
830 __sock_put(sk);
831 }
832
833 packet_flush_mclist(sk);
834
835 #ifdef CONFIG_PACKET_MMAP
836 if (po->pg_vec) {
837 struct tpacket_req req;
838 memset(&req, 0, sizeof(req));
839 packet_set_ring(sk, &req, 1);
840 }
841 #endif
842
843 /*
844 * Now the socket is dead. No more input will appear.
845 */
846
847 sock_orphan(sk);
848 sock->sk = NULL;
849
850 /* Purge queues */
851
852 skb_queue_purge(&sk->sk_receive_queue);
853
854 sock_put(sk);
855 return 0;
856 }
857
858 /*
859 * Attach a packet hook.
860 */
861
862 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
863 {
864 struct packet_sock *po = pkt_sk(sk);
865 /*
866 * Detach an existing hook if present.
867 */
868
869 lock_sock(sk);
870
871 spin_lock(&po->bind_lock);
872 if (po->running) {
873 __sock_put(sk);
874 po->running = 0;
875 po->num = 0;
876 spin_unlock(&po->bind_lock);
877 dev_remove_pack(&po->prot_hook);
878 spin_lock(&po->bind_lock);
879 }
880
881 po->num = protocol;
882 po->prot_hook.type = protocol;
883 po->prot_hook.dev = dev;
884
885 po->ifindex = dev ? dev->ifindex : 0;
886
887 if (protocol == 0)
888 goto out_unlock;
889
890 if (dev) {
891 if (dev->flags&IFF_UP) {
892 dev_add_pack(&po->prot_hook);
893 sock_hold(sk);
894 po->running = 1;
895 } else {
896 sk->sk_err = ENETDOWN;
897 if (!sock_flag(sk, SOCK_DEAD))
898 sk->sk_error_report(sk);
899 }
900 } else {
901 dev_add_pack(&po->prot_hook);
902 sock_hold(sk);
903 po->running = 1;
904 }
905
906 out_unlock:
907 spin_unlock(&po->bind_lock);
908 release_sock(sk);
909 return 0;
910 }
911
912 /*
913 * Bind a packet socket to a device
914 */
915
916 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len)
917 {
918 struct sock *sk=sock->sk;
919 char name[15];
920 struct net_device *dev;
921 int err = -ENODEV;
922
923 /*
924 * Check legality
925 */
926
927 if (addr_len != sizeof(struct sockaddr))
928 return -EINVAL;
929 strlcpy(name,uaddr->sa_data,sizeof(name));
930
931 dev = dev_get_by_name(name);
932 if (dev) {
933 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
934 dev_put(dev);
935 }
936 return err;
937 }
938
939 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
940 {
941 struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
942 struct sock *sk=sock->sk;
943 struct net_device *dev = NULL;
944 int err;
945
946
947 /*
948 * Check legality
949 */
950
951 if (addr_len < sizeof(struct sockaddr_ll))
952 return -EINVAL;
953 if (sll->sll_family != AF_PACKET)
954 return -EINVAL;
955
956 if (sll->sll_ifindex) {
957 err = -ENODEV;
958 dev = dev_get_by_index(sll->sll_ifindex);
959 if (dev == NULL)
960 goto out;
961 }
962 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
963 if (dev)
964 dev_put(dev);
965
966 out:
967 return err;
968 }
969
970 static struct proto packet_proto = {
971 .name = "PACKET",
972 .owner = THIS_MODULE,
973 .obj_size = sizeof(struct packet_sock),
974 };
975
976 /*
977 * Create a packet of type SOCK_PACKET.
978 */
979
980 static int packet_create(struct socket *sock, int protocol)
981 {
982 struct sock *sk;
983 struct packet_sock *po;
984 __be16 proto = (__force __be16)protocol; /* weird, but documented */
985 int err;
986
987 if (!capable(CAP_NET_RAW))
988 return -EPERM;
989 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
990 sock->type != SOCK_PACKET)
991 return -ESOCKTNOSUPPORT;
992
993 sock->state = SS_UNCONNECTED;
994
995 err = -ENOBUFS;
996 sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 1);
997 if (sk == NULL)
998 goto out;
999
1000 sock->ops = &packet_ops;
1001 if (sock->type == SOCK_PACKET)
1002 sock->ops = &packet_ops_spkt;
1003
1004 sock_init_data(sock, sk);
1005
1006 po = pkt_sk(sk);
1007 sk->sk_family = PF_PACKET;
1008 po->num = proto;
1009
1010 sk->sk_destruct = packet_sock_destruct;
1011 atomic_inc(&packet_socks_nr);
1012
1013 /*
1014 * Attach a protocol block
1015 */
1016
1017 spin_lock_init(&po->bind_lock);
1018 po->prot_hook.func = packet_rcv;
1019
1020 if (sock->type == SOCK_PACKET)
1021 po->prot_hook.func = packet_rcv_spkt;
1022
1023 po->prot_hook.af_packet_priv = sk;
1024
1025 if (proto) {
1026 po->prot_hook.type = proto;
1027 dev_add_pack(&po->prot_hook);
1028 sock_hold(sk);
1029 po->running = 1;
1030 }
1031
1032 write_lock_bh(&packet_sklist_lock);
1033 sk_add_node(sk, &packet_sklist);
1034 write_unlock_bh(&packet_sklist_lock);
1035 return(0);
1036 out:
1037 return err;
1038 }
1039
1040 /*
1041 * Pull a packet from our receive queue and hand it to the user.
1042 * If necessary we block.
1043 */
1044
1045 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1046 struct msghdr *msg, size_t len, int flags)
1047 {
1048 struct sock *sk = sock->sk;
1049 struct sk_buff *skb;
1050 int copied, err;
1051 struct sockaddr_ll *sll;
1052
1053 err = -EINVAL;
1054 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
1055 goto out;
1056
1057 #if 0
1058 /* What error should we return now? EUNATTACH? */
1059 if (pkt_sk(sk)->ifindex < 0)
1060 return -ENODEV;
1061 #endif
1062
1063 /*
1064 * Call the generic datagram receiver. This handles all sorts
1065 * of horrible races and re-entrancy so we can forget about it
1066 * in the protocol layers.
1067 *
1068 * Now it will return ENETDOWN, if device have just gone down,
1069 * but then it will block.
1070 */
1071
1072 skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err);
1073
1074 /*
1075 * An error occurred so return it. Because skb_recv_datagram()
1076 * handles the blocking we don't see and worry about blocking
1077 * retries.
1078 */
1079
1080 if (skb == NULL)
1081 goto out;
1082
1083 /*
1084 * If the address length field is there to be filled in, we fill
1085 * it in now.
1086 */
1087
1088 sll = &PACKET_SKB_CB(skb)->sa.ll;
1089 if (sock->type == SOCK_PACKET)
1090 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1091 else
1092 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1093
1094 /*
1095 * You lose any data beyond the buffer you gave. If it worries a
1096 * user program they can ask the device for its MTU anyway.
1097 */
1098
1099 copied = skb->len;
1100 if (copied > len)
1101 {
1102 copied=len;
1103 msg->msg_flags|=MSG_TRUNC;
1104 }
1105
1106 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1107 if (err)
1108 goto out_free;
1109
1110 sock_recv_timestamp(msg, sk, skb);
1111
1112 if (msg->msg_name)
1113 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1114 msg->msg_namelen);
1115
1116 if (pkt_sk(sk)->auxdata) {
1117 struct tpacket_auxdata aux;
1118
1119 aux.tp_status = TP_STATUS_USER;
1120 if (skb->ip_summed == CHECKSUM_PARTIAL)
1121 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1122 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1123 aux.tp_snaplen = skb->len;
1124 aux.tp_mac = 0;
1125 aux.tp_net = skb_network_offset(skb);
1126
1127 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1128 }
1129
1130 /*
1131 * Free or return the buffer as appropriate. Again this
1132 * hides all the races and re-entrancy issues from us.
1133 */
1134 err = (flags&MSG_TRUNC) ? skb->len : copied;
1135
1136 out_free:
1137 skb_free_datagram(sk, skb);
1138 out:
1139 return err;
1140 }
1141
1142 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1143 int *uaddr_len, int peer)
1144 {
1145 struct net_device *dev;
1146 struct sock *sk = sock->sk;
1147
1148 if (peer)
1149 return -EOPNOTSUPP;
1150
1151 uaddr->sa_family = AF_PACKET;
1152 dev = dev_get_by_index(pkt_sk(sk)->ifindex);
1153 if (dev) {
1154 strlcpy(uaddr->sa_data, dev->name, 15);
1155 dev_put(dev);
1156 } else
1157 memset(uaddr->sa_data, 0, 14);
1158 *uaddr_len = sizeof(*uaddr);
1159
1160 return 0;
1161 }
1162
1163 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1164 int *uaddr_len, int peer)
1165 {
1166 struct net_device *dev;
1167 struct sock *sk = sock->sk;
1168 struct packet_sock *po = pkt_sk(sk);
1169 struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
1170
1171 if (peer)
1172 return -EOPNOTSUPP;
1173
1174 sll->sll_family = AF_PACKET;
1175 sll->sll_ifindex = po->ifindex;
1176 sll->sll_protocol = po->num;
1177 dev = dev_get_by_index(po->ifindex);
1178 if (dev) {
1179 sll->sll_hatype = dev->type;
1180 sll->sll_halen = dev->addr_len;
1181 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1182 dev_put(dev);
1183 } else {
1184 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1185 sll->sll_halen = 0;
1186 }
1187 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1188
1189 return 0;
1190 }
1191
1192 static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what)
1193 {
1194 switch (i->type) {
1195 case PACKET_MR_MULTICAST:
1196 if (what > 0)
1197 dev_mc_add(dev, i->addr, i->alen, 0);
1198 else
1199 dev_mc_delete(dev, i->addr, i->alen, 0);
1200 break;
1201 case PACKET_MR_PROMISC:
1202 dev_set_promiscuity(dev, what);
1203 break;
1204 case PACKET_MR_ALLMULTI:
1205 dev_set_allmulti(dev, what);
1206 break;
1207 default:;
1208 }
1209 }
1210
1211 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1212 {
1213 for ( ; i; i=i->next) {
1214 if (i->ifindex == dev->ifindex)
1215 packet_dev_mc(dev, i, what);
1216 }
1217 }
1218
1219 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1220 {
1221 struct packet_sock *po = pkt_sk(sk);
1222 struct packet_mclist *ml, *i;
1223 struct net_device *dev;
1224 int err;
1225
1226 rtnl_lock();
1227
1228 err = -ENODEV;
1229 dev = __dev_get_by_index(mreq->mr_ifindex);
1230 if (!dev)
1231 goto done;
1232
1233 err = -EINVAL;
1234 if (mreq->mr_alen > dev->addr_len)
1235 goto done;
1236
1237 err = -ENOBUFS;
1238 i = kmalloc(sizeof(*i), GFP_KERNEL);
1239 if (i == NULL)
1240 goto done;
1241
1242 err = 0;
1243 for (ml = po->mclist; ml; ml = ml->next) {
1244 if (ml->ifindex == mreq->mr_ifindex &&
1245 ml->type == mreq->mr_type &&
1246 ml->alen == mreq->mr_alen &&
1247 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1248 ml->count++;
1249 /* Free the new element ... */
1250 kfree(i);
1251 goto done;
1252 }
1253 }
1254
1255 i->type = mreq->mr_type;
1256 i->ifindex = mreq->mr_ifindex;
1257 i->alen = mreq->mr_alen;
1258 memcpy(i->addr, mreq->mr_address, i->alen);
1259 i->count = 1;
1260 i->next = po->mclist;
1261 po->mclist = i;
1262 packet_dev_mc(dev, i, +1);
1263
1264 done:
1265 rtnl_unlock();
1266 return err;
1267 }
1268
1269 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1270 {
1271 struct packet_mclist *ml, **mlp;
1272
1273 rtnl_lock();
1274
1275 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1276 if (ml->ifindex == mreq->mr_ifindex &&
1277 ml->type == mreq->mr_type &&
1278 ml->alen == mreq->mr_alen &&
1279 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1280 if (--ml->count == 0) {
1281 struct net_device *dev;
1282 *mlp = ml->next;
1283 dev = dev_get_by_index(ml->ifindex);
1284 if (dev) {
1285 packet_dev_mc(dev, ml, -1);
1286 dev_put(dev);
1287 }
1288 kfree(ml);
1289 }
1290 rtnl_unlock();
1291 return 0;
1292 }
1293 }
1294 rtnl_unlock();
1295 return -EADDRNOTAVAIL;
1296 }
1297
1298 static void packet_flush_mclist(struct sock *sk)
1299 {
1300 struct packet_sock *po = pkt_sk(sk);
1301 struct packet_mclist *ml;
1302
1303 if (!po->mclist)
1304 return;
1305
1306 rtnl_lock();
1307 while ((ml = po->mclist) != NULL) {
1308 struct net_device *dev;
1309
1310 po->mclist = ml->next;
1311 if ((dev = dev_get_by_index(ml->ifindex)) != NULL) {
1312 packet_dev_mc(dev, ml, -1);
1313 dev_put(dev);
1314 }
1315 kfree(ml);
1316 }
1317 rtnl_unlock();
1318 }
1319
1320 static int
1321 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1322 {
1323 struct sock *sk = sock->sk;
1324 struct packet_sock *po = pkt_sk(sk);
1325 int ret;
1326
1327 if (level != SOL_PACKET)
1328 return -ENOPROTOOPT;
1329
1330 switch(optname) {
1331 case PACKET_ADD_MEMBERSHIP:
1332 case PACKET_DROP_MEMBERSHIP:
1333 {
1334 struct packet_mreq_max mreq;
1335 int len = optlen;
1336 memset(&mreq, 0, sizeof(mreq));
1337 if (len < sizeof(struct packet_mreq))
1338 return -EINVAL;
1339 if (len > sizeof(mreq))
1340 len = sizeof(mreq);
1341 if (copy_from_user(&mreq,optval,len))
1342 return -EFAULT;
1343 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1344 return -EINVAL;
1345 if (optname == PACKET_ADD_MEMBERSHIP)
1346 ret = packet_mc_add(sk, &mreq);
1347 else
1348 ret = packet_mc_drop(sk, &mreq);
1349 return ret;
1350 }
1351
1352 #ifdef CONFIG_PACKET_MMAP
1353 case PACKET_RX_RING:
1354 {
1355 struct tpacket_req req;
1356
1357 if (optlen<sizeof(req))
1358 return -EINVAL;
1359 if (copy_from_user(&req,optval,sizeof(req)))
1360 return -EFAULT;
1361 return packet_set_ring(sk, &req, 0);
1362 }
1363 case PACKET_COPY_THRESH:
1364 {
1365 int val;
1366
1367 if (optlen!=sizeof(val))
1368 return -EINVAL;
1369 if (copy_from_user(&val,optval,sizeof(val)))
1370 return -EFAULT;
1371
1372 pkt_sk(sk)->copy_thresh = val;
1373 return 0;
1374 }
1375 #endif
1376 case PACKET_AUXDATA:
1377 {
1378 int val;
1379
1380 if (optlen < sizeof(val))
1381 return -EINVAL;
1382 if (copy_from_user(&val, optval, sizeof(val)))
1383 return -EFAULT;
1384
1385 po->auxdata = !!val;
1386 return 0;
1387 }
1388 case PACKET_ORIGDEV:
1389 {
1390 int val;
1391
1392 if (optlen < sizeof(val))
1393 return -EINVAL;
1394 if (copy_from_user(&val, optval, sizeof(val)))
1395 return -EFAULT;
1396
1397 po->origdev = !!val;
1398 return 0;
1399 }
1400 default:
1401 return -ENOPROTOOPT;
1402 }
1403 }
1404
1405 static int packet_getsockopt(struct socket *sock, int level, int optname,
1406 char __user *optval, int __user *optlen)
1407 {
1408 int len;
1409 int val;
1410 struct sock *sk = sock->sk;
1411 struct packet_sock *po = pkt_sk(sk);
1412 void *data;
1413 struct tpacket_stats st;
1414
1415 if (level != SOL_PACKET)
1416 return -ENOPROTOOPT;
1417
1418 if (get_user(len, optlen))
1419 return -EFAULT;
1420
1421 if (len < 0)
1422 return -EINVAL;
1423
1424 switch(optname) {
1425 case PACKET_STATISTICS:
1426 if (len > sizeof(struct tpacket_stats))
1427 len = sizeof(struct tpacket_stats);
1428 spin_lock_bh(&sk->sk_receive_queue.lock);
1429 st = po->stats;
1430 memset(&po->stats, 0, sizeof(st));
1431 spin_unlock_bh(&sk->sk_receive_queue.lock);
1432 st.tp_packets += st.tp_drops;
1433
1434 data = &st;
1435 break;
1436 case PACKET_AUXDATA:
1437 if (len > sizeof(int))
1438 len = sizeof(int);
1439 val = po->auxdata;
1440
1441 data = &val;
1442 break;
1443 case PACKET_ORIGDEV:
1444 if (len > sizeof(int))
1445 len = sizeof(int);
1446 val = po->origdev;
1447
1448 data = &val;
1449 break;
1450 default:
1451 return -ENOPROTOOPT;
1452 }
1453
1454 if (put_user(len, optlen))
1455 return -EFAULT;
1456 if (copy_to_user(optval, data, len))
1457 return -EFAULT;
1458 return 0;
1459 }
1460
1461
1462 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
1463 {
1464 struct sock *sk;
1465 struct hlist_node *node;
1466 struct net_device *dev = data;
1467
1468 read_lock(&packet_sklist_lock);
1469 sk_for_each(sk, node, &packet_sklist) {
1470 struct packet_sock *po = pkt_sk(sk);
1471
1472 switch (msg) {
1473 case NETDEV_UNREGISTER:
1474 if (po->mclist)
1475 packet_dev_mclist(dev, po->mclist, -1);
1476 /* fallthrough */
1477
1478 case NETDEV_DOWN:
1479 if (dev->ifindex == po->ifindex) {
1480 spin_lock(&po->bind_lock);
1481 if (po->running) {
1482 __dev_remove_pack(&po->prot_hook);
1483 __sock_put(sk);
1484 po->running = 0;
1485 sk->sk_err = ENETDOWN;
1486 if (!sock_flag(sk, SOCK_DEAD))
1487 sk->sk_error_report(sk);
1488 }
1489 if (msg == NETDEV_UNREGISTER) {
1490 po->ifindex = -1;
1491 po->prot_hook.dev = NULL;
1492 }
1493 spin_unlock(&po->bind_lock);
1494 }
1495 break;
1496 case NETDEV_UP:
1497 spin_lock(&po->bind_lock);
1498 if (dev->ifindex == po->ifindex && po->num &&
1499 !po->running) {
1500 dev_add_pack(&po->prot_hook);
1501 sock_hold(sk);
1502 po->running = 1;
1503 }
1504 spin_unlock(&po->bind_lock);
1505 break;
1506 }
1507 }
1508 read_unlock(&packet_sklist_lock);
1509 return NOTIFY_DONE;
1510 }
1511
1512
1513 static int packet_ioctl(struct socket *sock, unsigned int cmd,
1514 unsigned long arg)
1515 {
1516 struct sock *sk = sock->sk;
1517
1518 switch(cmd) {
1519 case SIOCOUTQ:
1520 {
1521 int amount = atomic_read(&sk->sk_wmem_alloc);
1522 return put_user(amount, (int __user *)arg);
1523 }
1524 case SIOCINQ:
1525 {
1526 struct sk_buff *skb;
1527 int amount = 0;
1528
1529 spin_lock_bh(&sk->sk_receive_queue.lock);
1530 skb = skb_peek(&sk->sk_receive_queue);
1531 if (skb)
1532 amount = skb->len;
1533 spin_unlock_bh(&sk->sk_receive_queue.lock);
1534 return put_user(amount, (int __user *)arg);
1535 }
1536 case SIOCGSTAMP:
1537 return sock_get_timestamp(sk, (struct timeval __user *)arg);
1538 case SIOCGSTAMPNS:
1539 return sock_get_timestampns(sk, (struct timespec __user *)arg);
1540
1541 #ifdef CONFIG_INET
1542 case SIOCADDRT:
1543 case SIOCDELRT:
1544 case SIOCDARP:
1545 case SIOCGARP:
1546 case SIOCSARP:
1547 case SIOCGIFADDR:
1548 case SIOCSIFADDR:
1549 case SIOCGIFBRDADDR:
1550 case SIOCSIFBRDADDR:
1551 case SIOCGIFNETMASK:
1552 case SIOCSIFNETMASK:
1553 case SIOCGIFDSTADDR:
1554 case SIOCSIFDSTADDR:
1555 case SIOCSIFFLAGS:
1556 return inet_dgram_ops.ioctl(sock, cmd, arg);
1557 #endif
1558
1559 default:
1560 return -ENOIOCTLCMD;
1561 }
1562 return 0;
1563 }
1564
1565 #ifndef CONFIG_PACKET_MMAP
1566 #define packet_mmap sock_no_mmap
1567 #define packet_poll datagram_poll
1568 #else
1569
1570 static unsigned int packet_poll(struct file * file, struct socket *sock,
1571 poll_table *wait)
1572 {
1573 struct sock *sk = sock->sk;
1574 struct packet_sock *po = pkt_sk(sk);
1575 unsigned int mask = datagram_poll(file, sock, wait);
1576
1577 spin_lock_bh(&sk->sk_receive_queue.lock);
1578 if (po->pg_vec) {
1579 unsigned last = po->head ? po->head-1 : po->frame_max;
1580 struct tpacket_hdr *h;
1581
1582 h = packet_lookup_frame(po, last);
1583
1584 if (h->tp_status)
1585 mask |= POLLIN | POLLRDNORM;
1586 }
1587 spin_unlock_bh(&sk->sk_receive_queue.lock);
1588 return mask;
1589 }
1590
1591
1592 /* Dirty? Well, I still did not learn better way to account
1593 * for user mmaps.
1594 */
1595
1596 static void packet_mm_open(struct vm_area_struct *vma)
1597 {
1598 struct file *file = vma->vm_file;
1599 struct socket * sock = file->private_data;
1600 struct sock *sk = sock->sk;
1601
1602 if (sk)
1603 atomic_inc(&pkt_sk(sk)->mapped);
1604 }
1605
1606 static void packet_mm_close(struct vm_area_struct *vma)
1607 {
1608 struct file *file = vma->vm_file;
1609 struct socket * sock = file->private_data;
1610 struct sock *sk = sock->sk;
1611
1612 if (sk)
1613 atomic_dec(&pkt_sk(sk)->mapped);
1614 }
1615
1616 static struct vm_operations_struct packet_mmap_ops = {
1617 .open = packet_mm_open,
1618 .close =packet_mm_close,
1619 };
1620
1621 static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order)
1622 {
1623 return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1);
1624 }
1625
1626 static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
1627 {
1628 int i;
1629
1630 for (i = 0; i < len; i++) {
1631 if (likely(pg_vec[i]))
1632 free_pages((unsigned long) pg_vec[i], order);
1633 }
1634 kfree(pg_vec);
1635 }
1636
1637 static inline char *alloc_one_pg_vec_page(unsigned long order)
1638 {
1639 return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO,
1640 order);
1641 }
1642
1643 static char **alloc_pg_vec(struct tpacket_req *req, int order)
1644 {
1645 unsigned int block_nr = req->tp_block_nr;
1646 char **pg_vec;
1647 int i;
1648
1649 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
1650 if (unlikely(!pg_vec))
1651 goto out;
1652
1653 for (i = 0; i < block_nr; i++) {
1654 pg_vec[i] = alloc_one_pg_vec_page(order);
1655 if (unlikely(!pg_vec[i]))
1656 goto out_free_pgvec;
1657 }
1658
1659 out:
1660 return pg_vec;
1661
1662 out_free_pgvec:
1663 free_pg_vec(pg_vec, order, block_nr);
1664 pg_vec = NULL;
1665 goto out;
1666 }
1667
1668 static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing)
1669 {
1670 char **pg_vec = NULL;
1671 struct packet_sock *po = pkt_sk(sk);
1672 int was_running, order = 0;
1673 __be16 num;
1674 int err = 0;
1675
1676 if (req->tp_block_nr) {
1677 int i, l;
1678
1679 /* Sanity tests and some calculations */
1680
1681 if (unlikely(po->pg_vec))
1682 return -EBUSY;
1683
1684 if (unlikely((int)req->tp_block_size <= 0))
1685 return -EINVAL;
1686 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
1687 return -EINVAL;
1688 if (unlikely(req->tp_frame_size < TPACKET_HDRLEN))
1689 return -EINVAL;
1690 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
1691 return -EINVAL;
1692
1693 po->frames_per_block = req->tp_block_size/req->tp_frame_size;
1694 if (unlikely(po->frames_per_block <= 0))
1695 return -EINVAL;
1696 if (unlikely((po->frames_per_block * req->tp_block_nr) !=
1697 req->tp_frame_nr))
1698 return -EINVAL;
1699
1700 err = -ENOMEM;
1701 order = get_order(req->tp_block_size);
1702 pg_vec = alloc_pg_vec(req, order);
1703 if (unlikely(!pg_vec))
1704 goto out;
1705
1706 l = 0;
1707 for (i = 0; i < req->tp_block_nr; i++) {
1708 char *ptr = pg_vec[i];
1709 struct tpacket_hdr *header;
1710 int k;
1711
1712 for (k = 0; k < po->frames_per_block; k++) {
1713 header = (struct tpacket_hdr *) ptr;
1714 header->tp_status = TP_STATUS_KERNEL;
1715 ptr += req->tp_frame_size;
1716 }
1717 }
1718 /* Done */
1719 } else {
1720 if (unlikely(req->tp_frame_nr))
1721 return -EINVAL;
1722 }
1723
1724 lock_sock(sk);
1725
1726 /* Detach socket from network */
1727 spin_lock(&po->bind_lock);
1728 was_running = po->running;
1729 num = po->num;
1730 if (was_running) {
1731 __dev_remove_pack(&po->prot_hook);
1732 po->num = 0;
1733 po->running = 0;
1734 __sock_put(sk);
1735 }
1736 spin_unlock(&po->bind_lock);
1737
1738 synchronize_net();
1739
1740 err = -EBUSY;
1741 if (closing || atomic_read(&po->mapped) == 0) {
1742 err = 0;
1743 #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
1744
1745 spin_lock_bh(&sk->sk_receive_queue.lock);
1746 pg_vec = XC(po->pg_vec, pg_vec);
1747 po->frame_max = (req->tp_frame_nr - 1);
1748 po->head = 0;
1749 po->frame_size = req->tp_frame_size;
1750 spin_unlock_bh(&sk->sk_receive_queue.lock);
1751
1752 order = XC(po->pg_vec_order, order);
1753 req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr);
1754
1755 po->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
1756 po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv;
1757 skb_queue_purge(&sk->sk_receive_queue);
1758 #undef XC
1759 if (atomic_read(&po->mapped))
1760 printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped));
1761 }
1762
1763 spin_lock(&po->bind_lock);
1764 if (was_running && !po->running) {
1765 sock_hold(sk);
1766 po->running = 1;
1767 po->num = num;
1768 dev_add_pack(&po->prot_hook);
1769 }
1770 spin_unlock(&po->bind_lock);
1771
1772 release_sock(sk);
1773
1774 if (pg_vec)
1775 free_pg_vec(pg_vec, order, req->tp_block_nr);
1776 out:
1777 return err;
1778 }
1779
1780 static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1781 {
1782 struct sock *sk = sock->sk;
1783 struct packet_sock *po = pkt_sk(sk);
1784 unsigned long size;
1785 unsigned long start;
1786 int err = -EINVAL;
1787 int i;
1788
1789 if (vma->vm_pgoff)
1790 return -EINVAL;
1791
1792 size = vma->vm_end - vma->vm_start;
1793
1794 lock_sock(sk);
1795 if (po->pg_vec == NULL)
1796 goto out;
1797 if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE)
1798 goto out;
1799
1800 start = vma->vm_start;
1801 for (i = 0; i < po->pg_vec_len; i++) {
1802 struct page *page = virt_to_page(po->pg_vec[i]);
1803 int pg_num;
1804
1805 for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) {
1806 err = vm_insert_page(vma, start, page);
1807 if (unlikely(err))
1808 goto out;
1809 start += PAGE_SIZE;
1810 }
1811 }
1812 atomic_inc(&po->mapped);
1813 vma->vm_ops = &packet_mmap_ops;
1814 err = 0;
1815
1816 out:
1817 release_sock(sk);
1818 return err;
1819 }
1820 #endif
1821
1822
1823 static const struct proto_ops packet_ops_spkt = {
1824 .family = PF_PACKET,
1825 .owner = THIS_MODULE,
1826 .release = packet_release,
1827 .bind = packet_bind_spkt,
1828 .connect = sock_no_connect,
1829 .socketpair = sock_no_socketpair,
1830 .accept = sock_no_accept,
1831 .getname = packet_getname_spkt,
1832 .poll = datagram_poll,
1833 .ioctl = packet_ioctl,
1834 .listen = sock_no_listen,
1835 .shutdown = sock_no_shutdown,
1836 .setsockopt = sock_no_setsockopt,
1837 .getsockopt = sock_no_getsockopt,
1838 .sendmsg = packet_sendmsg_spkt,
1839 .recvmsg = packet_recvmsg,
1840 .mmap = sock_no_mmap,
1841 .sendpage = sock_no_sendpage,
1842 };
1843
1844 static const struct proto_ops packet_ops = {
1845 .family = PF_PACKET,
1846 .owner = THIS_MODULE,
1847 .release = packet_release,
1848 .bind = packet_bind,
1849 .connect = sock_no_connect,
1850 .socketpair = sock_no_socketpair,
1851 .accept = sock_no_accept,
1852 .getname = packet_getname,
1853 .poll = packet_poll,
1854 .ioctl = packet_ioctl,
1855 .listen = sock_no_listen,
1856 .shutdown = sock_no_shutdown,
1857 .setsockopt = packet_setsockopt,
1858 .getsockopt = packet_getsockopt,
1859 .sendmsg = packet_sendmsg,
1860 .recvmsg = packet_recvmsg,
1861 .mmap = packet_mmap,
1862 .sendpage = sock_no_sendpage,
1863 };
1864
1865 static struct net_proto_family packet_family_ops = {
1866 .family = PF_PACKET,
1867 .create = packet_create,
1868 .owner = THIS_MODULE,
1869 };
1870
1871 static struct notifier_block packet_netdev_notifier = {
1872 .notifier_call =packet_notifier,
1873 };
1874
1875 #ifdef CONFIG_PROC_FS
1876 static inline struct sock *packet_seq_idx(loff_t off)
1877 {
1878 struct sock *s;
1879 struct hlist_node *node;
1880
1881 sk_for_each(s, node, &packet_sklist) {
1882 if (!off--)
1883 return s;
1884 }
1885 return NULL;
1886 }
1887
1888 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
1889 {
1890 read_lock(&packet_sklist_lock);
1891 return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN;
1892 }
1893
1894 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1895 {
1896 ++*pos;
1897 return (v == SEQ_START_TOKEN)
1898 ? sk_head(&packet_sklist)
1899 : sk_next((struct sock*)v) ;
1900 }
1901
1902 static void packet_seq_stop(struct seq_file *seq, void *v)
1903 {
1904 read_unlock(&packet_sklist_lock);
1905 }
1906
1907 static int packet_seq_show(struct seq_file *seq, void *v)
1908 {
1909 if (v == SEQ_START_TOKEN)
1910 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
1911 else {
1912 struct sock *s = v;
1913 const struct packet_sock *po = pkt_sk(s);
1914
1915 seq_printf(seq,
1916 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
1917 s,
1918 atomic_read(&s->sk_refcnt),
1919 s->sk_type,
1920 ntohs(po->num),
1921 po->ifindex,
1922 po->running,
1923 atomic_read(&s->sk_rmem_alloc),
1924 sock_i_uid(s),
1925 sock_i_ino(s) );
1926 }
1927
1928 return 0;
1929 }
1930
1931 static const struct seq_operations packet_seq_ops = {
1932 .start = packet_seq_start,
1933 .next = packet_seq_next,
1934 .stop = packet_seq_stop,
1935 .show = packet_seq_show,
1936 };
1937
1938 static int packet_seq_open(struct inode *inode, struct file *file)
1939 {
1940 return seq_open(file, &packet_seq_ops);
1941 }
1942
1943 static const struct file_operations packet_seq_fops = {
1944 .owner = THIS_MODULE,
1945 .open = packet_seq_open,
1946 .read = seq_read,
1947 .llseek = seq_lseek,
1948 .release = seq_release,
1949 };
1950
1951 #endif
1952
1953 static void __exit packet_exit(void)
1954 {
1955 proc_net_remove(&init_net, "packet");
1956 unregister_netdevice_notifier(&packet_netdev_notifier);
1957 sock_unregister(PF_PACKET);
1958 proto_unregister(&packet_proto);
1959 }
1960
1961 static int __init packet_init(void)
1962 {
1963 int rc = proto_register(&packet_proto, 0);
1964
1965 if (rc != 0)
1966 goto out;
1967
1968 sock_register(&packet_family_ops);
1969 register_netdevice_notifier(&packet_netdev_notifier);
1970 proc_net_fops_create(&init_net, "packet", 0, &packet_seq_fops);
1971 out:
1972 return rc;
1973 }
1974
1975 module_init(packet_init);
1976 module_exit(packet_exit);
1977 MODULE_LICENSE("GPL");
1978 MODULE_ALIAS_NETPROTO(PF_PACKET);
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