blob: 8973ea78831e2d2e6424357cc3af496368989acd [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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.
Eric W. Biederman0fb375f2005-09-21 00:11:37 -070039 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/types.h>
53#include <linux/sched.h>
54#include <linux/mm.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080055#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <linux/fcntl.h>
57#include <linux/socket.h>
58#include <linux/in.h>
59#include <linux/inet.h>
60#include <linux/netdevice.h>
61#include <linux/if_packet.h>
62#include <linux/wireless.h>
63#include <linux/kmod.h>
64#include <net/ip.h>
65#include <net/protocol.h>
66#include <linux/skbuff.h>
67#include <net/sock.h>
68#include <linux/errno.h>
69#include <linux/timer.h>
70#include <asm/system.h>
71#include <asm/uaccess.h>
72#include <asm/ioctls.h>
73#include <asm/page.h>
Al Viroa1f8e7f72006-10-19 16:08:53 -040074#include <asm/cacheflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include <asm/io.h>
76#include <linux/proc_fs.h>
77#include <linux/seq_file.h>
78#include <linux/poll.h>
79#include <linux/module.h>
80#include <linux/init.h>
81
82#ifdef CONFIG_INET
83#include <net/inet_common.h>
84#endif
85
86#define CONFIG_SOCK_PACKET 1
87
88/*
89 Proposed replacement for SIOC{ADD,DEL}MULTI and
90 IFF_PROMISC, IFF_ALLMULTI flags.
91
92 It is more expensive, but I believe,
93 it is really correct solution: reentereble, safe and fault tolerant.
94
95 IFF_PROMISC/IFF_ALLMULTI/SIOC{ADD/DEL}MULTI are faked by keeping
96 reference count and global flag, so that real status is
97 (gflag|(count != 0)), so that we can use obsolete faulty interface
98 not harming clever users.
99 */
100#define CONFIG_PACKET_MULTICAST 1
101
102/*
103 Assumptions:
104 - if device has no dev->hard_header routine, it adds and removes ll header
105 inside itself. In this case ll header is invisible outside of device,
106 but higher levels still should reserve dev->hard_header_len.
107 Some devices are enough clever to reallocate skb, when header
108 will not fit to reserved space (tunnel), another ones are silly
109 (PPP).
110 - packet socket receives packets with pulled ll header,
111 so that SOCK_RAW should push it back.
112
113On receive:
114-----------
115
116Incoming, dev->hard_header!=NULL
117 mac.raw -> ll header
118 data -> data
119
120Outgoing, dev->hard_header!=NULL
121 mac.raw -> ll header
122 data -> ll header
123
124Incoming, dev->hard_header==NULL
125 mac.raw -> UNKNOWN position. It is very likely, that it points to ll header.
126 PPP makes it, that is wrong, because introduce assymetry
127 between rx and tx paths.
128 data -> data
129
130Outgoing, dev->hard_header==NULL
131 mac.raw -> data. ll header is still not built!
132 data -> data
133
134Resume
135 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
136
137
138On transmit:
139------------
140
141dev->hard_header != NULL
142 mac.raw -> ll header
143 data -> ll header
144
145dev->hard_header == NULL (ll header is added by device, we cannot control it)
146 mac.raw -> data
147 data -> data
148
149 We should set nh.raw on output to correct posistion,
150 packet classifier depends on it.
151 */
152
153/* List of all packet sockets. */
154static HLIST_HEAD(packet_sklist);
155static DEFINE_RWLOCK(packet_sklist_lock);
156
157static atomic_t packet_socks_nr;
158
159
160/* Private packet socket structures. */
161
162#ifdef CONFIG_PACKET_MULTICAST
163struct packet_mclist
164{
165 struct packet_mclist *next;
166 int ifindex;
167 int count;
168 unsigned short type;
169 unsigned short alen;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -0700170 unsigned char addr[MAX_ADDR_LEN];
171};
172/* identical to struct packet_mreq except it has
173 * a longer address field.
174 */
175struct packet_mreq_max
176{
177 int mr_ifindex;
178 unsigned short mr_type;
179 unsigned short mr_alen;
180 unsigned char mr_address[MAX_ADDR_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181};
182#endif
183#ifdef CONFIG_PACKET_MMAP
184static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing);
185#endif
186
187static void packet_flush_mclist(struct sock *sk);
188
189struct packet_sock {
190 /* struct sock has to be the first member of packet_sock */
191 struct sock sk;
192 struct tpacket_stats stats;
193#ifdef CONFIG_PACKET_MMAP
194 char * *pg_vec;
195 unsigned int head;
196 unsigned int frames_per_block;
197 unsigned int frame_size;
198 unsigned int frame_max;
199 int copy_thresh;
200#endif
201 struct packet_type prot_hook;
202 spinlock_t bind_lock;
Herbert Xu8dc41942007-02-04 23:31:32 -0800203 unsigned int running:1, /* prot_hook is attached*/
204 auxdata:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 int ifindex; /* bound device */
Al Viro0e11c912006-11-08 00:26:29 -0800206 __be16 num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207#ifdef CONFIG_PACKET_MULTICAST
208 struct packet_mclist *mclist;
209#endif
210#ifdef CONFIG_PACKET_MMAP
211 atomic_t mapped;
212 unsigned int pg_vec_order;
213 unsigned int pg_vec_pages;
214 unsigned int pg_vec_len;
215#endif
216};
217
Herbert Xu8dc41942007-02-04 23:31:32 -0800218#define PACKET_SKB_CB(__skb) ((struct tpacket_auxdata *)((__skb)->cb))
219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220#ifdef CONFIG_PACKET_MMAP
221
222static inline char *packet_lookup_frame(struct packet_sock *po, unsigned int position)
223{
224 unsigned int pg_vec_pos, frame_offset;
225 char *frame;
226
227 pg_vec_pos = position / po->frames_per_block;
228 frame_offset = position % po->frames_per_block;
229
230 frame = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size);
231
232 return frame;
233}
234#endif
235
236static inline struct packet_sock *pkt_sk(struct sock *sk)
237{
238 return (struct packet_sock *)sk;
239}
240
241static void packet_sock_destruct(struct sock *sk)
242{
243 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
244 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
245
246 if (!sock_flag(sk, SOCK_DEAD)) {
247 printk("Attempt to release alive packet socket: %p\n", sk);
248 return;
249 }
250
251 atomic_dec(&packet_socks_nr);
252#ifdef PACKET_REFCNT_DEBUG
253 printk(KERN_DEBUG "PACKET socket %p is free, %d are alive\n", sk, atomic_read(&packet_socks_nr));
254#endif
255}
256
257
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800258static const struct proto_ops packet_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260#ifdef CONFIG_SOCK_PACKET
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800261static const struct proto_ops packet_ops_spkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700263static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
265 struct sock *sk;
266 struct sockaddr_pkt *spkt;
267
268 /*
269 * When we registered the protocol we saved the socket in the data
270 * field for just this event.
271 */
272
273 sk = pt->af_packet_priv;
274
275 /*
276 * Yank back the headers [hope the device set this
277 * right or kerboom...]
278 *
279 * Incoming packets have ll header pulled,
280 * push it back.
281 *
282 * For outgoing ones skb->data == skb->mac.raw
283 * so that this procedure is noop.
284 */
285
286 if (skb->pkt_type == PACKET_LOOPBACK)
287 goto out;
288
289 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
290 goto oom;
291
292 /* drop any routing info */
293 dst_release(skb->dst);
294 skb->dst = NULL;
295
Phil Oester84531c22005-07-12 11:57:52 -0700296 /* drop conntrack reference */
297 nf_reset(skb);
298
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 spkt = (struct sockaddr_pkt*)skb->cb;
300
301 skb_push(skb, skb->data-skb->mac.raw);
302
303 /*
304 * The SOCK_PACKET socket receives _all_ frames.
305 */
306
307 spkt->spkt_family = dev->type;
308 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
309 spkt->spkt_protocol = skb->protocol;
310
311 /*
312 * Charge the memory to the socket. This is done specifically
313 * to prevent sockets using all the memory up.
314 */
315
316 if (sock_queue_rcv_skb(sk,skb) == 0)
317 return 0;
318
319out:
320 kfree_skb(skb);
321oom:
322 return 0;
323}
324
325
326/*
327 * Output a raw packet to a device layer. This bypasses all the other
328 * protocol layers and you must therefore supply it with a complete frame
329 */
330
331static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
332 struct msghdr *msg, size_t len)
333{
334 struct sock *sk = sock->sk;
335 struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name;
336 struct sk_buff *skb;
337 struct net_device *dev;
Al Viro0e11c912006-11-08 00:26:29 -0800338 __be16 proto=0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 int err;
340
341 /*
342 * Get and verify the address.
343 */
344
345 if (saddr)
346 {
347 if (msg->msg_namelen < sizeof(struct sockaddr))
348 return(-EINVAL);
349 if (msg->msg_namelen==sizeof(struct sockaddr_pkt))
350 proto=saddr->spkt_protocol;
351 }
352 else
353 return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */
354
355 /*
356 * Find the device first to size check it
357 */
358
359 saddr->spkt_device[13] = 0;
360 dev = dev_get_by_name(saddr->spkt_device);
361 err = -ENODEV;
362 if (dev == NULL)
363 goto out_unlock;
364
David S. Millerd5e76b02007-01-25 19:30:36 -0800365 err = -ENETDOWN;
366 if (!(dev->flags & IFF_UP))
367 goto out_unlock;
368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 /*
370 * You may not queue a frame bigger than the mtu. This is the lowest level
371 * raw protocol and you must do your own fragmentation at this level.
372 */
373
374 err = -EMSGSIZE;
Kris Katterjohn8ae55f02006-01-23 16:28:02 -0800375 if (len > dev->mtu + dev->hard_header_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 goto out_unlock;
377
378 err = -ENOBUFS;
379 skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);
380
381 /*
382 * If the write buffer is full, then tough. At this level the user gets to
383 * deal with the problem - do your own algorithmic backoffs. That's far
384 * more flexible.
385 */
386
387 if (skb == NULL)
388 goto out_unlock;
389
390 /*
391 * Fill it in
392 */
393
394 /* FIXME: Save some space for broken drivers that write a
395 * hard header at transmission time by themselves. PPP is the
396 * notable one here. This should really be fixed at the driver level.
397 */
398 skb_reserve(skb, LL_RESERVED_SPACE(dev));
399 skb->nh.raw = skb->data;
400
401 /* Try to align data part correctly */
402 if (dev->hard_header) {
403 skb->data -= dev->hard_header_len;
404 skb->tail -= dev->hard_header_len;
405 if (len < dev->hard_header_len)
406 skb->nh.raw = skb->data;
407 }
408
409 /* Returns -EFAULT on error */
410 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
411 skb->protocol = proto;
412 skb->dev = dev;
413 skb->priority = sk->sk_priority;
414 if (err)
415 goto out_free;
416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 /*
418 * Now send it
419 */
420
421 dev_queue_xmit(skb);
422 dev_put(dev);
423 return(len);
424
425out_free:
426 kfree_skb(skb);
427out_unlock:
428 if (dev)
429 dev_put(dev);
430 return err;
431}
432#endif
433
David S. Millerdbcb5852007-01-24 15:21:02 -0800434static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
435 unsigned int res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436{
437 struct sk_filter *filter;
438
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700439 rcu_read_lock_bh();
440 filter = rcu_dereference(sk->sk_filter);
David S. Millerdbcb5852007-01-24 15:21:02 -0800441 if (filter != NULL)
442 res = sk_run_filter(skb, filter->insns, filter->len);
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700443 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
David S. Millerdbcb5852007-01-24 15:21:02 -0800445 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446}
447
448/*
449 This function makes lazy skb cloning in hope that most of packets
450 are discarded by BPF.
451
452 Note tricky part: we DO mangle shared skb! skb->data, skb->len
453 and skb->cb are mangled. It works because (and until) packets
454 falling here are owned by current CPU. Output packets are cloned
455 by dev_queue_xmit_nit(), input packets are processed by net_bh
456 sequencially, so that if we return skb to original state on exit,
457 we will not harm anyone.
458 */
459
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700460static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461{
462 struct sock *sk;
463 struct sockaddr_ll *sll;
464 struct packet_sock *po;
465 u8 * skb_head = skb->data;
466 int skb_len = skb->len;
David S. Millerdbcb5852007-01-24 15:21:02 -0800467 unsigned int snaplen, res;
Herbert Xu8dc41942007-02-04 23:31:32 -0800468 struct tpacket_auxdata *aux;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
470 if (skb->pkt_type == PACKET_LOOPBACK)
471 goto drop;
472
473 sk = pt->af_packet_priv;
474 po = pkt_sk(sk);
475
476 skb->dev = dev;
477
478 if (dev->hard_header) {
479 /* The device has an explicit notion of ll header,
480 exported to higher levels.
481
482 Otherwise, the device hides datails of it frame
483 structure, so that corresponding packet head
484 never delivered to user.
485 */
486 if (sk->sk_type != SOCK_DGRAM)
487 skb_push(skb, skb->data - skb->mac.raw);
488 else if (skb->pkt_type == PACKET_OUTGOING) {
489 /* Special case: outgoing packets have ll header at head */
490 skb_pull(skb, skb->nh.raw - skb->data);
491 }
492 }
493
494 snaplen = skb->len;
495
David S. Millerdbcb5852007-01-24 15:21:02 -0800496 res = run_filter(skb, sk, snaplen);
497 if (!res)
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700498 goto drop_n_restore;
David S. Millerdbcb5852007-01-24 15:21:02 -0800499 if (snaplen > res)
500 snaplen = res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
502 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
503 (unsigned)sk->sk_rcvbuf)
504 goto drop_n_acct;
505
506 if (skb_shared(skb)) {
507 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
508 if (nskb == NULL)
509 goto drop_n_acct;
510
511 if (skb_head != skb->data) {
512 skb->data = skb_head;
513 skb->len = skb_len;
514 }
515 kfree_skb(skb);
516 skb = nskb;
517 }
518
519 sll = (struct sockaddr_ll*)skb->cb;
520 sll->sll_family = AF_PACKET;
521 sll->sll_hatype = dev->type;
522 sll->sll_protocol = skb->protocol;
523 sll->sll_pkttype = skb->pkt_type;
524 sll->sll_ifindex = dev->ifindex;
525 sll->sll_halen = 0;
526
527 if (dev->hard_header_parse)
528 sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr);
529
Herbert Xu8dc41942007-02-04 23:31:32 -0800530 aux = PACKET_SKB_CB(skb);
531 aux->tp_status = TP_STATUS_USER;
532 if (skb->ip_summed == CHECKSUM_PARTIAL)
533 aux->tp_status |= TP_STATUS_CSUMNOTREADY;
534 aux->tp_len = skb->len;
535 aux->tp_snaplen = snaplen;
536 aux->tp_mac = 0;
537 aux->tp_net = skb->nh.raw - skb->data;
538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (pskb_trim(skb, snaplen))
540 goto drop_n_acct;
541
542 skb_set_owner_r(skb, sk);
543 skb->dev = NULL;
544 dst_release(skb->dst);
545 skb->dst = NULL;
546
Phil Oester84531c22005-07-12 11:57:52 -0700547 /* drop conntrack reference */
548 nf_reset(skb);
549
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 spin_lock(&sk->sk_receive_queue.lock);
551 po->stats.tp_packets++;
552 __skb_queue_tail(&sk->sk_receive_queue, skb);
553 spin_unlock(&sk->sk_receive_queue.lock);
554 sk->sk_data_ready(sk, skb->len);
555 return 0;
556
557drop_n_acct:
558 spin_lock(&sk->sk_receive_queue.lock);
559 po->stats.tp_drops++;
560 spin_unlock(&sk->sk_receive_queue.lock);
561
562drop_n_restore:
563 if (skb_head != skb->data && skb_shared(skb)) {
564 skb->data = skb_head;
565 skb->len = skb_len;
566 }
567drop:
568 kfree_skb(skb);
569 return 0;
570}
571
572#ifdef CONFIG_PACKET_MMAP
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700573static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574{
575 struct sock *sk;
576 struct packet_sock *po;
577 struct sockaddr_ll *sll;
578 struct tpacket_hdr *h;
579 u8 * skb_head = skb->data;
580 int skb_len = skb->len;
David S. Millerdbcb5852007-01-24 15:21:02 -0800581 unsigned int snaplen, res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
583 unsigned short macoff, netoff;
584 struct sk_buff *copy_skb = NULL;
585
586 if (skb->pkt_type == PACKET_LOOPBACK)
587 goto drop;
588
589 sk = pt->af_packet_priv;
590 po = pkt_sk(sk);
591
592 if (dev->hard_header) {
593 if (sk->sk_type != SOCK_DGRAM)
594 skb_push(skb, skb->data - skb->mac.raw);
595 else if (skb->pkt_type == PACKET_OUTGOING) {
596 /* Special case: outgoing packets have ll header at head */
597 skb_pull(skb, skb->nh.raw - skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 }
599 }
600
Herbert Xu8dc41942007-02-04 23:31:32 -0800601 if (skb->ip_summed == CHECKSUM_PARTIAL)
602 status |= TP_STATUS_CSUMNOTREADY;
603
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 snaplen = skb->len;
605
David S. Millerdbcb5852007-01-24 15:21:02 -0800606 res = run_filter(skb, sk, snaplen);
607 if (!res)
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700608 goto drop_n_restore;
David S. Millerdbcb5852007-01-24 15:21:02 -0800609 if (snaplen > res)
610 snaplen = res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
612 if (sk->sk_type == SOCK_DGRAM) {
613 macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16;
614 } else {
615 unsigned maclen = skb->nh.raw - skb->data;
616 netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen));
617 macoff = netoff - maclen;
618 }
619
620 if (macoff + snaplen > po->frame_size) {
621 if (po->copy_thresh &&
622 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
623 (unsigned)sk->sk_rcvbuf) {
624 if (skb_shared(skb)) {
625 copy_skb = skb_clone(skb, GFP_ATOMIC);
626 } else {
627 copy_skb = skb_get(skb);
628 skb_head = skb->data;
629 }
630 if (copy_skb)
631 skb_set_owner_r(copy_skb, sk);
632 }
633 snaplen = po->frame_size - macoff;
634 if ((int)snaplen < 0)
635 snaplen = 0;
636 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
638 spin_lock(&sk->sk_receive_queue.lock);
639 h = (struct tpacket_hdr *)packet_lookup_frame(po, po->head);
640
641 if (h->tp_status)
642 goto ring_is_full;
643 po->head = po->head != po->frame_max ? po->head+1 : 0;
644 po->stats.tp_packets++;
645 if (copy_skb) {
646 status |= TP_STATUS_COPY;
647 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
648 }
649 if (!po->stats.tp_drops)
650 status &= ~TP_STATUS_LOSING;
651 spin_unlock(&sk->sk_receive_queue.lock);
652
Patrick McHardycbe21d82006-09-17 23:59:57 -0700653 skb_copy_bits(skb, 0, (u8*)h + macoff, snaplen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
655 h->tp_len = skb->len;
656 h->tp_snaplen = snaplen;
657 h->tp_mac = macoff;
658 h->tp_net = netoff;
Patrick McHardya61bbcf2005-08-14 17:24:31 -0700659 if (skb->tstamp.off_sec == 0) {
660 __net_timestamp(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 sock_enable_timestamp(sk);
662 }
Herbert Xu325ed822005-10-03 13:57:23 -0700663 h->tp_sec = skb->tstamp.off_sec;
664 h->tp_usec = skb->tstamp.off_usec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
666 sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h)));
667 sll->sll_halen = 0;
668 if (dev->hard_header_parse)
669 sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr);
670 sll->sll_family = AF_PACKET;
671 sll->sll_hatype = dev->type;
672 sll->sll_protocol = skb->protocol;
673 sll->sll_pkttype = skb->pkt_type;
674 sll->sll_ifindex = dev->ifindex;
675
676 h->tp_status = status;
Ralf Baechlee16aa202006-12-07 00:11:33 -0800677 smp_mb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
679 {
680 struct page *p_start, *p_end;
681 u8 *h_end = (u8 *)h + macoff + snaplen - 1;
682
683 p_start = virt_to_page(h);
684 p_end = virt_to_page(h_end);
685 while (p_start <= p_end) {
686 flush_dcache_page(p_start);
687 p_start++;
688 }
689 }
690
691 sk->sk_data_ready(sk, 0);
692
693drop_n_restore:
694 if (skb_head != skb->data && skb_shared(skb)) {
695 skb->data = skb_head;
696 skb->len = skb_len;
697 }
698drop:
699 kfree_skb(skb);
700 return 0;
701
702ring_is_full:
703 po->stats.tp_drops++;
704 spin_unlock(&sk->sk_receive_queue.lock);
705
706 sk->sk_data_ready(sk, 0);
707 if (copy_skb)
708 kfree_skb(copy_skb);
709 goto drop_n_restore;
710}
711
712#endif
713
714
715static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
716 struct msghdr *msg, size_t len)
717{
718 struct sock *sk = sock->sk;
719 struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name;
720 struct sk_buff *skb;
721 struct net_device *dev;
Al Viro0e11c912006-11-08 00:26:29 -0800722 __be16 proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 unsigned char *addr;
724 int ifindex, err, reserve = 0;
725
726 /*
727 * Get and verify the address.
728 */
729
730 if (saddr == NULL) {
731 struct packet_sock *po = pkt_sk(sk);
732
733 ifindex = po->ifindex;
734 proto = po->num;
735 addr = NULL;
736 } else {
737 err = -EINVAL;
738 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
739 goto out;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -0700740 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
741 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 ifindex = saddr->sll_ifindex;
743 proto = saddr->sll_protocol;
744 addr = saddr->sll_addr;
745 }
746
747
748 dev = dev_get_by_index(ifindex);
749 err = -ENXIO;
750 if (dev == NULL)
751 goto out_unlock;
752 if (sock->type == SOCK_RAW)
753 reserve = dev->hard_header_len;
754
David S. Millerd5e76b02007-01-25 19:30:36 -0800755 err = -ENETDOWN;
756 if (!(dev->flags & IFF_UP))
757 goto out_unlock;
758
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 err = -EMSGSIZE;
760 if (len > dev->mtu+reserve)
761 goto out_unlock;
762
763 skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev),
764 msg->msg_flags & MSG_DONTWAIT, &err);
765 if (skb==NULL)
766 goto out_unlock;
767
768 skb_reserve(skb, LL_RESERVED_SPACE(dev));
769 skb->nh.raw = skb->data;
770
771 if (dev->hard_header) {
772 int res;
773 err = -EINVAL;
774 res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len);
775 if (sock->type != SOCK_DGRAM) {
776 skb->tail = skb->data;
777 skb->len = 0;
778 } else if (res < 0)
779 goto out_free;
780 }
781
782 /* Returns -EFAULT on error */
783 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
784 if (err)
785 goto out_free;
786
787 skb->protocol = proto;
788 skb->dev = dev;
789 skb->priority = sk->sk_priority;
790
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 /*
792 * Now send it
793 */
794
795 err = dev_queue_xmit(skb);
796 if (err > 0 && (err = net_xmit_errno(err)) != 0)
797 goto out_unlock;
798
799 dev_put(dev);
800
801 return(len);
802
803out_free:
804 kfree_skb(skb);
805out_unlock:
806 if (dev)
807 dev_put(dev);
808out:
809 return err;
810}
811
812/*
813 * Close a PACKET socket. This is fairly simple. We immediately go
814 * to 'closed' state and remove our protocol entry in the device list.
815 */
816
817static int packet_release(struct socket *sock)
818{
819 struct sock *sk = sock->sk;
820 struct packet_sock *po;
821
822 if (!sk)
823 return 0;
824
825 po = pkt_sk(sk);
826
827 write_lock_bh(&packet_sklist_lock);
828 sk_del_node_init(sk);
829 write_unlock_bh(&packet_sklist_lock);
830
831 /*
832 * Unhook packet receive handler.
833 */
834
835 if (po->running) {
836 /*
837 * Remove the protocol hook
838 */
839 dev_remove_pack(&po->prot_hook);
840 po->running = 0;
841 po->num = 0;
842 __sock_put(sk);
843 }
844
845#ifdef CONFIG_PACKET_MULTICAST
846 packet_flush_mclist(sk);
847#endif
848
849#ifdef CONFIG_PACKET_MMAP
850 if (po->pg_vec) {
851 struct tpacket_req req;
852 memset(&req, 0, sizeof(req));
853 packet_set_ring(sk, &req, 1);
854 }
855#endif
856
857 /*
858 * Now the socket is dead. No more input will appear.
859 */
860
861 sock_orphan(sk);
862 sock->sk = NULL;
863
864 /* Purge queues */
865
866 skb_queue_purge(&sk->sk_receive_queue);
867
868 sock_put(sk);
869 return 0;
870}
871
872/*
873 * Attach a packet hook.
874 */
875
Al Viro0e11c912006-11-08 00:26:29 -0800876static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877{
878 struct packet_sock *po = pkt_sk(sk);
879 /*
880 * Detach an existing hook if present.
881 */
882
883 lock_sock(sk);
884
885 spin_lock(&po->bind_lock);
886 if (po->running) {
887 __sock_put(sk);
888 po->running = 0;
889 po->num = 0;
890 spin_unlock(&po->bind_lock);
891 dev_remove_pack(&po->prot_hook);
892 spin_lock(&po->bind_lock);
893 }
894
895 po->num = protocol;
896 po->prot_hook.type = protocol;
897 po->prot_hook.dev = dev;
898
899 po->ifindex = dev ? dev->ifindex : 0;
900
901 if (protocol == 0)
902 goto out_unlock;
903
904 if (dev) {
905 if (dev->flags&IFF_UP) {
906 dev_add_pack(&po->prot_hook);
907 sock_hold(sk);
908 po->running = 1;
909 } else {
910 sk->sk_err = ENETDOWN;
911 if (!sock_flag(sk, SOCK_DEAD))
912 sk->sk_error_report(sk);
913 }
914 } else {
915 dev_add_pack(&po->prot_hook);
916 sock_hold(sk);
917 po->running = 1;
918 }
919
920out_unlock:
921 spin_unlock(&po->bind_lock);
922 release_sock(sk);
923 return 0;
924}
925
926/*
927 * Bind a packet socket to a device
928 */
929
930#ifdef CONFIG_SOCK_PACKET
931
932static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len)
933{
934 struct sock *sk=sock->sk;
935 char name[15];
936 struct net_device *dev;
937 int err = -ENODEV;
938
939 /*
940 * Check legality
941 */
942
Kris Katterjohn8ae55f02006-01-23 16:28:02 -0800943 if (addr_len != sizeof(struct sockaddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 return -EINVAL;
945 strlcpy(name,uaddr->sa_data,sizeof(name));
946
947 dev = dev_get_by_name(name);
948 if (dev) {
949 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
950 dev_put(dev);
951 }
952 return err;
953}
954#endif
955
956static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
957{
958 struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
959 struct sock *sk=sock->sk;
960 struct net_device *dev = NULL;
961 int err;
962
963
964 /*
965 * Check legality
966 */
967
968 if (addr_len < sizeof(struct sockaddr_ll))
969 return -EINVAL;
970 if (sll->sll_family != AF_PACKET)
971 return -EINVAL;
972
973 if (sll->sll_ifindex) {
974 err = -ENODEV;
975 dev = dev_get_by_index(sll->sll_ifindex);
976 if (dev == NULL)
977 goto out;
978 }
979 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
980 if (dev)
981 dev_put(dev);
982
983out:
984 return err;
985}
986
987static struct proto packet_proto = {
988 .name = "PACKET",
989 .owner = THIS_MODULE,
990 .obj_size = sizeof(struct packet_sock),
991};
992
993/*
994 * Create a packet of type SOCK_PACKET.
995 */
996
997static int packet_create(struct socket *sock, int protocol)
998{
999 struct sock *sk;
1000 struct packet_sock *po;
Al Viro0e11c912006-11-08 00:26:29 -08001001 __be16 proto = (__force __be16)protocol; /* weird, but documented */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 int err;
1003
1004 if (!capable(CAP_NET_RAW))
1005 return -EPERM;
1006 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW
1007#ifdef CONFIG_SOCK_PACKET
1008 && sock->type != SOCK_PACKET
1009#endif
1010 )
1011 return -ESOCKTNOSUPPORT;
1012
1013 sock->state = SS_UNCONNECTED;
1014
1015 err = -ENOBUFS;
1016 sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 1);
1017 if (sk == NULL)
1018 goto out;
1019
1020 sock->ops = &packet_ops;
1021#ifdef CONFIG_SOCK_PACKET
1022 if (sock->type == SOCK_PACKET)
1023 sock->ops = &packet_ops_spkt;
1024#endif
1025 sock_init_data(sock, sk);
1026
1027 po = pkt_sk(sk);
1028 sk->sk_family = PF_PACKET;
Al Viro0e11c912006-11-08 00:26:29 -08001029 po->num = proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
1031 sk->sk_destruct = packet_sock_destruct;
1032 atomic_inc(&packet_socks_nr);
1033
1034 /*
1035 * Attach a protocol block
1036 */
1037
1038 spin_lock_init(&po->bind_lock);
1039 po->prot_hook.func = packet_rcv;
1040#ifdef CONFIG_SOCK_PACKET
1041 if (sock->type == SOCK_PACKET)
1042 po->prot_hook.func = packet_rcv_spkt;
1043#endif
1044 po->prot_hook.af_packet_priv = sk;
1045
Al Viro0e11c912006-11-08 00:26:29 -08001046 if (proto) {
1047 po->prot_hook.type = proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 dev_add_pack(&po->prot_hook);
1049 sock_hold(sk);
1050 po->running = 1;
1051 }
1052
1053 write_lock_bh(&packet_sklist_lock);
1054 sk_add_node(sk, &packet_sklist);
1055 write_unlock_bh(&packet_sklist_lock);
1056 return(0);
1057out:
1058 return err;
1059}
1060
1061/*
1062 * Pull a packet from our receive queue and hand it to the user.
1063 * If necessary we block.
1064 */
1065
1066static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1067 struct msghdr *msg, size_t len, int flags)
1068{
1069 struct sock *sk = sock->sk;
1070 struct sk_buff *skb;
1071 int copied, err;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001072 struct sockaddr_ll *sll;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073
1074 err = -EINVAL;
1075 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
1076 goto out;
1077
1078#if 0
1079 /* What error should we return now? EUNATTACH? */
1080 if (pkt_sk(sk)->ifindex < 0)
1081 return -ENODEV;
1082#endif
1083
1084 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 * Call the generic datagram receiver. This handles all sorts
1086 * of horrible races and re-entrancy so we can forget about it
1087 * in the protocol layers.
1088 *
1089 * Now it will return ENETDOWN, if device have just gone down,
1090 * but then it will block.
1091 */
1092
1093 skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err);
1094
1095 /*
1096 * An error occurred so return it. Because skb_recv_datagram()
1097 * handles the blocking we don't see and worry about blocking
1098 * retries.
1099 */
1100
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001101 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 goto out;
1103
1104 /*
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001105 * If the address length field is there to be filled in, we fill
1106 * it in now.
1107 */
1108
1109 sll = (struct sockaddr_ll*)skb->cb;
1110 if (sock->type == SOCK_PACKET)
1111 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1112 else
1113 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1114
1115 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 * You lose any data beyond the buffer you gave. If it worries a
1117 * user program they can ask the device for its MTU anyway.
1118 */
1119
1120 copied = skb->len;
1121 if (copied > len)
1122 {
1123 copied=len;
1124 msg->msg_flags|=MSG_TRUNC;
1125 }
1126
1127 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1128 if (err)
1129 goto out_free;
1130
1131 sock_recv_timestamp(msg, sk, skb);
1132
1133 if (msg->msg_name)
1134 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1135
Herbert Xu8dc41942007-02-04 23:31:32 -08001136 if (pkt_sk(sk)->auxdata) {
1137 struct tpacket_auxdata *aux = PACKET_SKB_CB(skb);
1138 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(*aux), aux);
1139 }
1140
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 /*
1142 * Free or return the buffer as appropriate. Again this
1143 * hides all the races and re-entrancy issues from us.
1144 */
1145 err = (flags&MSG_TRUNC) ? skb->len : copied;
1146
1147out_free:
1148 skb_free_datagram(sk, skb);
1149out:
1150 return err;
1151}
1152
1153#ifdef CONFIG_SOCK_PACKET
1154static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1155 int *uaddr_len, int peer)
1156{
1157 struct net_device *dev;
1158 struct sock *sk = sock->sk;
1159
1160 if (peer)
1161 return -EOPNOTSUPP;
1162
1163 uaddr->sa_family = AF_PACKET;
1164 dev = dev_get_by_index(pkt_sk(sk)->ifindex);
1165 if (dev) {
1166 strlcpy(uaddr->sa_data, dev->name, 15);
1167 dev_put(dev);
1168 } else
1169 memset(uaddr->sa_data, 0, 14);
1170 *uaddr_len = sizeof(*uaddr);
1171
1172 return 0;
1173}
1174#endif
1175
1176static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1177 int *uaddr_len, int peer)
1178{
1179 struct net_device *dev;
1180 struct sock *sk = sock->sk;
1181 struct packet_sock *po = pkt_sk(sk);
1182 struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr;
1183
1184 if (peer)
1185 return -EOPNOTSUPP;
1186
1187 sll->sll_family = AF_PACKET;
1188 sll->sll_ifindex = po->ifindex;
1189 sll->sll_protocol = po->num;
1190 dev = dev_get_by_index(po->ifindex);
1191 if (dev) {
1192 sll->sll_hatype = dev->type;
1193 sll->sll_halen = dev->addr_len;
1194 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1195 dev_put(dev);
1196 } else {
1197 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1198 sll->sll_halen = 0;
1199 }
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001200 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201
1202 return 0;
1203}
1204
1205#ifdef CONFIG_PACKET_MULTICAST
1206static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what)
1207{
1208 switch (i->type) {
1209 case PACKET_MR_MULTICAST:
1210 if (what > 0)
1211 dev_mc_add(dev, i->addr, i->alen, 0);
1212 else
1213 dev_mc_delete(dev, i->addr, i->alen, 0);
1214 break;
1215 case PACKET_MR_PROMISC:
1216 dev_set_promiscuity(dev, what);
1217 break;
1218 case PACKET_MR_ALLMULTI:
1219 dev_set_allmulti(dev, what);
1220 break;
1221 default:;
1222 }
1223}
1224
1225static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1226{
1227 for ( ; i; i=i->next) {
1228 if (i->ifindex == dev->ifindex)
1229 packet_dev_mc(dev, i, what);
1230 }
1231}
1232
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001233static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234{
1235 struct packet_sock *po = pkt_sk(sk);
1236 struct packet_mclist *ml, *i;
1237 struct net_device *dev;
1238 int err;
1239
1240 rtnl_lock();
1241
1242 err = -ENODEV;
1243 dev = __dev_get_by_index(mreq->mr_ifindex);
1244 if (!dev)
1245 goto done;
1246
1247 err = -EINVAL;
1248 if (mreq->mr_alen > dev->addr_len)
1249 goto done;
1250
1251 err = -ENOBUFS;
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08001252 i = kmalloc(sizeof(*i), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 if (i == NULL)
1254 goto done;
1255
1256 err = 0;
1257 for (ml = po->mclist; ml; ml = ml->next) {
1258 if (ml->ifindex == mreq->mr_ifindex &&
1259 ml->type == mreq->mr_type &&
1260 ml->alen == mreq->mr_alen &&
1261 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1262 ml->count++;
1263 /* Free the new element ... */
1264 kfree(i);
1265 goto done;
1266 }
1267 }
1268
1269 i->type = mreq->mr_type;
1270 i->ifindex = mreq->mr_ifindex;
1271 i->alen = mreq->mr_alen;
1272 memcpy(i->addr, mreq->mr_address, i->alen);
1273 i->count = 1;
1274 i->next = po->mclist;
1275 po->mclist = i;
1276 packet_dev_mc(dev, i, +1);
1277
1278done:
1279 rtnl_unlock();
1280 return err;
1281}
1282
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001283static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284{
1285 struct packet_mclist *ml, **mlp;
1286
1287 rtnl_lock();
1288
1289 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1290 if (ml->ifindex == mreq->mr_ifindex &&
1291 ml->type == mreq->mr_type &&
1292 ml->alen == mreq->mr_alen &&
1293 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1294 if (--ml->count == 0) {
1295 struct net_device *dev;
1296 *mlp = ml->next;
1297 dev = dev_get_by_index(ml->ifindex);
1298 if (dev) {
1299 packet_dev_mc(dev, ml, -1);
1300 dev_put(dev);
1301 }
1302 kfree(ml);
1303 }
1304 rtnl_unlock();
1305 return 0;
1306 }
1307 }
1308 rtnl_unlock();
1309 return -EADDRNOTAVAIL;
1310}
1311
1312static void packet_flush_mclist(struct sock *sk)
1313{
1314 struct packet_sock *po = pkt_sk(sk);
1315 struct packet_mclist *ml;
1316
1317 if (!po->mclist)
1318 return;
1319
1320 rtnl_lock();
1321 while ((ml = po->mclist) != NULL) {
1322 struct net_device *dev;
1323
1324 po->mclist = ml->next;
1325 if ((dev = dev_get_by_index(ml->ifindex)) != NULL) {
1326 packet_dev_mc(dev, ml, -1);
1327 dev_put(dev);
1328 }
1329 kfree(ml);
1330 }
1331 rtnl_unlock();
1332}
1333#endif
1334
1335static int
1336packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1337{
1338 struct sock *sk = sock->sk;
Herbert Xu8dc41942007-02-04 23:31:32 -08001339 struct packet_sock *po = pkt_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 int ret;
1341
1342 if (level != SOL_PACKET)
1343 return -ENOPROTOOPT;
1344
1345 switch(optname) {
1346#ifdef CONFIG_PACKET_MULTICAST
1347 case PACKET_ADD_MEMBERSHIP:
1348 case PACKET_DROP_MEMBERSHIP:
1349 {
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001350 struct packet_mreq_max mreq;
1351 int len = optlen;
1352 memset(&mreq, 0, sizeof(mreq));
1353 if (len < sizeof(struct packet_mreq))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 return -EINVAL;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001355 if (len > sizeof(mreq))
1356 len = sizeof(mreq);
1357 if (copy_from_user(&mreq,optval,len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 return -EFAULT;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001359 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1360 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 if (optname == PACKET_ADD_MEMBERSHIP)
1362 ret = packet_mc_add(sk, &mreq);
1363 else
1364 ret = packet_mc_drop(sk, &mreq);
1365 return ret;
1366 }
1367#endif
1368#ifdef CONFIG_PACKET_MMAP
1369 case PACKET_RX_RING:
1370 {
1371 struct tpacket_req req;
1372
1373 if (optlen<sizeof(req))
1374 return -EINVAL;
1375 if (copy_from_user(&req,optval,sizeof(req)))
1376 return -EFAULT;
1377 return packet_set_ring(sk, &req, 0);
1378 }
1379 case PACKET_COPY_THRESH:
1380 {
1381 int val;
1382
1383 if (optlen!=sizeof(val))
1384 return -EINVAL;
1385 if (copy_from_user(&val,optval,sizeof(val)))
1386 return -EFAULT;
1387
1388 pkt_sk(sk)->copy_thresh = val;
1389 return 0;
1390 }
1391#endif
Herbert Xu8dc41942007-02-04 23:31:32 -08001392 case PACKET_AUXDATA:
1393 {
1394 int val;
1395
1396 if (optlen < sizeof(val))
1397 return -EINVAL;
1398 if (copy_from_user(&val, optval, sizeof(val)))
1399 return -EFAULT;
1400
1401 po->auxdata = !!val;
1402 return 0;
1403 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 default:
1405 return -ENOPROTOOPT;
1406 }
1407}
1408
1409static int packet_getsockopt(struct socket *sock, int level, int optname,
1410 char __user *optval, int __user *optlen)
1411{
1412 int len;
Herbert Xu8dc41942007-02-04 23:31:32 -08001413 int val;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 struct sock *sk = sock->sk;
1415 struct packet_sock *po = pkt_sk(sk);
Herbert Xu8dc41942007-02-04 23:31:32 -08001416 void *data;
1417 struct tpacket_stats st;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
1419 if (level != SOL_PACKET)
1420 return -ENOPROTOOPT;
1421
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001422 if (get_user(len, optlen))
1423 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425 if (len < 0)
1426 return -EINVAL;
1427
1428 switch(optname) {
1429 case PACKET_STATISTICS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 if (len > sizeof(struct tpacket_stats))
1431 len = sizeof(struct tpacket_stats);
1432 spin_lock_bh(&sk->sk_receive_queue.lock);
1433 st = po->stats;
1434 memset(&po->stats, 0, sizeof(st));
1435 spin_unlock_bh(&sk->sk_receive_queue.lock);
1436 st.tp_packets += st.tp_drops;
1437
Herbert Xu8dc41942007-02-04 23:31:32 -08001438 data = &st;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 break;
Herbert Xu8dc41942007-02-04 23:31:32 -08001440 case PACKET_AUXDATA:
1441 if (len > sizeof(int))
1442 len = sizeof(int);
1443 val = po->auxdata;
1444
1445 data = &val;
1446 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 default:
1448 return -ENOPROTOOPT;
1449 }
1450
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001451 if (put_user(len, optlen))
1452 return -EFAULT;
Herbert Xu8dc41942007-02-04 23:31:32 -08001453 if (copy_to_user(optval, data, len))
1454 return -EFAULT;
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001455 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456}
1457
1458
1459static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
1460{
1461 struct sock *sk;
1462 struct hlist_node *node;
1463 struct net_device *dev = (struct net_device*)data;
1464
1465 read_lock(&packet_sklist_lock);
1466 sk_for_each(sk, node, &packet_sklist) {
1467 struct packet_sock *po = pkt_sk(sk);
1468
1469 switch (msg) {
1470 case NETDEV_UNREGISTER:
1471#ifdef CONFIG_PACKET_MULTICAST
1472 if (po->mclist)
1473 packet_dev_mclist(dev, po->mclist, -1);
1474 // fallthrough
1475#endif
1476 case NETDEV_DOWN:
1477 if (dev->ifindex == po->ifindex) {
1478 spin_lock(&po->bind_lock);
1479 if (po->running) {
1480 __dev_remove_pack(&po->prot_hook);
1481 __sock_put(sk);
1482 po->running = 0;
1483 sk->sk_err = ENETDOWN;
1484 if (!sock_flag(sk, SOCK_DEAD))
1485 sk->sk_error_report(sk);
1486 }
1487 if (msg == NETDEV_UNREGISTER) {
1488 po->ifindex = -1;
1489 po->prot_hook.dev = NULL;
1490 }
1491 spin_unlock(&po->bind_lock);
1492 }
1493 break;
1494 case NETDEV_UP:
1495 spin_lock(&po->bind_lock);
1496 if (dev->ifindex == po->ifindex && po->num &&
1497 !po->running) {
1498 dev_add_pack(&po->prot_hook);
1499 sock_hold(sk);
1500 po->running = 1;
1501 }
1502 spin_unlock(&po->bind_lock);
1503 break;
1504 }
1505 }
1506 read_unlock(&packet_sklist_lock);
1507 return NOTIFY_DONE;
1508}
1509
1510
1511static int packet_ioctl(struct socket *sock, unsigned int cmd,
1512 unsigned long arg)
1513{
1514 struct sock *sk = sock->sk;
1515
1516 switch(cmd) {
1517 case SIOCOUTQ:
1518 {
1519 int amount = atomic_read(&sk->sk_wmem_alloc);
1520 return put_user(amount, (int __user *)arg);
1521 }
1522 case SIOCINQ:
1523 {
1524 struct sk_buff *skb;
1525 int amount = 0;
1526
1527 spin_lock_bh(&sk->sk_receive_queue.lock);
1528 skb = skb_peek(&sk->sk_receive_queue);
1529 if (skb)
1530 amount = skb->len;
1531 spin_unlock_bh(&sk->sk_receive_queue.lock);
1532 return put_user(amount, (int __user *)arg);
1533 }
1534 case SIOCGSTAMP:
1535 return sock_get_timestamp(sk, (struct timeval __user *)arg);
1536
1537#ifdef CONFIG_INET
1538 case SIOCADDRT:
1539 case SIOCDELRT:
1540 case SIOCDARP:
1541 case SIOCGARP:
1542 case SIOCSARP:
1543 case SIOCGIFADDR:
1544 case SIOCSIFADDR:
1545 case SIOCGIFBRDADDR:
1546 case SIOCSIFBRDADDR:
1547 case SIOCGIFNETMASK:
1548 case SIOCSIFNETMASK:
1549 case SIOCGIFDSTADDR:
1550 case SIOCSIFDSTADDR:
1551 case SIOCSIFFLAGS:
1552 return inet_dgram_ops.ioctl(sock, cmd, arg);
1553#endif
1554
1555 default:
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -08001556 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 }
1558 return 0;
1559}
1560
1561#ifndef CONFIG_PACKET_MMAP
1562#define packet_mmap sock_no_mmap
1563#define packet_poll datagram_poll
1564#else
1565
1566static unsigned int packet_poll(struct file * file, struct socket *sock,
1567 poll_table *wait)
1568{
1569 struct sock *sk = sock->sk;
1570 struct packet_sock *po = pkt_sk(sk);
1571 unsigned int mask = datagram_poll(file, sock, wait);
1572
1573 spin_lock_bh(&sk->sk_receive_queue.lock);
1574 if (po->pg_vec) {
1575 unsigned last = po->head ? po->head-1 : po->frame_max;
1576 struct tpacket_hdr *h;
1577
1578 h = (struct tpacket_hdr *)packet_lookup_frame(po, last);
1579
1580 if (h->tp_status)
1581 mask |= POLLIN | POLLRDNORM;
1582 }
1583 spin_unlock_bh(&sk->sk_receive_queue.lock);
1584 return mask;
1585}
1586
1587
1588/* Dirty? Well, I still did not learn better way to account
1589 * for user mmaps.
1590 */
1591
1592static void packet_mm_open(struct vm_area_struct *vma)
1593{
1594 struct file *file = vma->vm_file;
Eric Dumazetb69aee02005-09-06 14:42:45 -07001595 struct socket * sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 struct sock *sk = sock->sk;
1597
1598 if (sk)
1599 atomic_inc(&pkt_sk(sk)->mapped);
1600}
1601
1602static void packet_mm_close(struct vm_area_struct *vma)
1603{
1604 struct file *file = vma->vm_file;
Eric Dumazetb69aee02005-09-06 14:42:45 -07001605 struct socket * sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 struct sock *sk = sock->sk;
1607
1608 if (sk)
1609 atomic_dec(&pkt_sk(sk)->mapped);
1610}
1611
1612static struct vm_operations_struct packet_mmap_ops = {
1613 .open = packet_mm_open,
1614 .close =packet_mm_close,
1615};
1616
1617static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order)
1618{
1619 return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1);
1620}
1621
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001622static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623{
1624 int i;
1625
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001626 for (i = 0; i < len; i++) {
1627 if (likely(pg_vec[i]))
1628 free_pages((unsigned long) pg_vec[i], order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 }
1630 kfree(pg_vec);
1631}
1632
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001633static inline char *alloc_one_pg_vec_page(unsigned long order)
1634{
1635 return (char *) __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_ZERO,
1636 order);
1637}
1638
1639static char **alloc_pg_vec(struct tpacket_req *req, int order)
1640{
1641 unsigned int block_nr = req->tp_block_nr;
1642 char **pg_vec;
1643 int i;
1644
1645 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
1646 if (unlikely(!pg_vec))
1647 goto out;
1648
1649 for (i = 0; i < block_nr; i++) {
1650 pg_vec[i] = alloc_one_pg_vec_page(order);
1651 if (unlikely(!pg_vec[i]))
1652 goto out_free_pgvec;
1653 }
1654
1655out:
1656 return pg_vec;
1657
1658out_free_pgvec:
1659 free_pg_vec(pg_vec, order, block_nr);
1660 pg_vec = NULL;
1661 goto out;
1662}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663
1664static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing)
1665{
1666 char **pg_vec = NULL;
1667 struct packet_sock *po = pkt_sk(sk);
Al Viro0e11c912006-11-08 00:26:29 -08001668 int was_running, order = 0;
1669 __be16 num;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 int err = 0;
1671
1672 if (req->tp_block_nr) {
1673 int i, l;
1674
1675 /* Sanity tests and some calculations */
1676
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001677 if (unlikely(po->pg_vec))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678 return -EBUSY;
1679
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001680 if (unlikely((int)req->tp_block_size <= 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 return -EINVAL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001682 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 return -EINVAL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001684 if (unlikely(req->tp_frame_size < TPACKET_HDRLEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 return -EINVAL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001686 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687 return -EINVAL;
1688
1689 po->frames_per_block = req->tp_block_size/req->tp_frame_size;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001690 if (unlikely(po->frames_per_block <= 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 return -EINVAL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001692 if (unlikely((po->frames_per_block * req->tp_block_nr) !=
1693 req->tp_frame_nr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695
1696 err = -ENOMEM;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001697 order = get_order(req->tp_block_size);
1698 pg_vec = alloc_pg_vec(req, order);
1699 if (unlikely(!pg_vec))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701
1702 l = 0;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001703 for (i = 0; i < req->tp_block_nr; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 char *ptr = pg_vec[i];
1705 struct tpacket_hdr *header;
1706 int k;
1707
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001708 for (k = 0; k < po->frames_per_block; k++) {
1709 header = (struct tpacket_hdr *) ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 header->tp_status = TP_STATUS_KERNEL;
1711 ptr += req->tp_frame_size;
1712 }
1713 }
1714 /* Done */
1715 } else {
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001716 if (unlikely(req->tp_frame_nr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717 return -EINVAL;
1718 }
1719
1720 lock_sock(sk);
1721
1722 /* Detach socket from network */
1723 spin_lock(&po->bind_lock);
1724 was_running = po->running;
1725 num = po->num;
1726 if (was_running) {
1727 __dev_remove_pack(&po->prot_hook);
1728 po->num = 0;
1729 po->running = 0;
1730 __sock_put(sk);
1731 }
1732 spin_unlock(&po->bind_lock);
1733
1734 synchronize_net();
1735
1736 err = -EBUSY;
1737 if (closing || atomic_read(&po->mapped) == 0) {
1738 err = 0;
1739#define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
1740
1741 spin_lock_bh(&sk->sk_receive_queue.lock);
1742 pg_vec = XC(po->pg_vec, pg_vec);
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001743 po->frame_max = (req->tp_frame_nr - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 po->head = 0;
1745 po->frame_size = req->tp_frame_size;
1746 spin_unlock_bh(&sk->sk_receive_queue.lock);
1747
1748 order = XC(po->pg_vec_order, order);
1749 req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr);
1750
1751 po->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
1752 po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv;
1753 skb_queue_purge(&sk->sk_receive_queue);
1754#undef XC
1755 if (atomic_read(&po->mapped))
1756 printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped));
1757 }
1758
1759 spin_lock(&po->bind_lock);
1760 if (was_running && !po->running) {
1761 sock_hold(sk);
1762 po->running = 1;
1763 po->num = num;
1764 dev_add_pack(&po->prot_hook);
1765 }
1766 spin_unlock(&po->bind_lock);
1767
1768 release_sock(sk);
1769
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 if (pg_vec)
1771 free_pg_vec(pg_vec, order, req->tp_block_nr);
1772out:
1773 return err;
1774}
1775
1776static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
1777{
1778 struct sock *sk = sock->sk;
1779 struct packet_sock *po = pkt_sk(sk);
1780 unsigned long size;
1781 unsigned long start;
1782 int err = -EINVAL;
1783 int i;
1784
1785 if (vma->vm_pgoff)
1786 return -EINVAL;
1787
1788 size = vma->vm_end - vma->vm_start;
1789
1790 lock_sock(sk);
1791 if (po->pg_vec == NULL)
1792 goto out;
1793 if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE)
1794 goto out;
1795
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796 start = vma->vm_start;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001797 for (i = 0; i < po->pg_vec_len; i++) {
1798 struct page *page = virt_to_page(po->pg_vec[i]);
1799 int pg_num;
1800
1801 for (pg_num = 0; pg_num < po->pg_vec_pages; pg_num++, page++) {
1802 err = vm_insert_page(vma, start, page);
1803 if (unlikely(err))
1804 goto out;
1805 start += PAGE_SIZE;
1806 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 }
David S. Miller4ebf0ae2005-12-06 16:38:35 -08001808 atomic_inc(&po->mapped);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 vma->vm_ops = &packet_mmap_ops;
1810 err = 0;
1811
1812out:
1813 release_sock(sk);
1814 return err;
1815}
1816#endif
1817
1818
1819#ifdef CONFIG_SOCK_PACKET
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001820static const struct proto_ops packet_ops_spkt = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 .family = PF_PACKET,
1822 .owner = THIS_MODULE,
1823 .release = packet_release,
1824 .bind = packet_bind_spkt,
1825 .connect = sock_no_connect,
1826 .socketpair = sock_no_socketpair,
1827 .accept = sock_no_accept,
1828 .getname = packet_getname_spkt,
1829 .poll = datagram_poll,
1830 .ioctl = packet_ioctl,
1831 .listen = sock_no_listen,
1832 .shutdown = sock_no_shutdown,
1833 .setsockopt = sock_no_setsockopt,
1834 .getsockopt = sock_no_getsockopt,
1835 .sendmsg = packet_sendmsg_spkt,
1836 .recvmsg = packet_recvmsg,
1837 .mmap = sock_no_mmap,
1838 .sendpage = sock_no_sendpage,
1839};
1840#endif
1841
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001842static const struct proto_ops packet_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 .family = PF_PACKET,
1844 .owner = THIS_MODULE,
1845 .release = packet_release,
1846 .bind = packet_bind,
1847 .connect = sock_no_connect,
1848 .socketpair = sock_no_socketpair,
1849 .accept = sock_no_accept,
1850 .getname = packet_getname,
1851 .poll = packet_poll,
1852 .ioctl = packet_ioctl,
1853 .listen = sock_no_listen,
1854 .shutdown = sock_no_shutdown,
1855 .setsockopt = packet_setsockopt,
1856 .getsockopt = packet_getsockopt,
1857 .sendmsg = packet_sendmsg,
1858 .recvmsg = packet_recvmsg,
1859 .mmap = packet_mmap,
1860 .sendpage = sock_no_sendpage,
1861};
1862
1863static struct net_proto_family packet_family_ops = {
1864 .family = PF_PACKET,
1865 .create = packet_create,
1866 .owner = THIS_MODULE,
1867};
1868
1869static struct notifier_block packet_netdev_notifier = {
1870 .notifier_call =packet_notifier,
1871};
1872
1873#ifdef CONFIG_PROC_FS
1874static inline struct sock *packet_seq_idx(loff_t off)
1875{
1876 struct sock *s;
1877 struct hlist_node *node;
1878
1879 sk_for_each(s, node, &packet_sklist) {
1880 if (!off--)
1881 return s;
1882 }
1883 return NULL;
1884}
1885
1886static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
1887{
1888 read_lock(&packet_sklist_lock);
1889 return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN;
1890}
1891
1892static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1893{
1894 ++*pos;
1895 return (v == SEQ_START_TOKEN)
1896 ? sk_head(&packet_sklist)
1897 : sk_next((struct sock*)v) ;
1898}
1899
1900static void packet_seq_stop(struct seq_file *seq, void *v)
1901{
1902 read_unlock(&packet_sklist_lock);
1903}
1904
1905static int packet_seq_show(struct seq_file *seq, void *v)
1906{
1907 if (v == SEQ_START_TOKEN)
1908 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
1909 else {
1910 struct sock *s = v;
1911 const struct packet_sock *po = pkt_sk(s);
1912
1913 seq_printf(seq,
1914 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
1915 s,
1916 atomic_read(&s->sk_refcnt),
1917 s->sk_type,
1918 ntohs(po->num),
1919 po->ifindex,
1920 po->running,
1921 atomic_read(&s->sk_rmem_alloc),
1922 sock_i_uid(s),
1923 sock_i_ino(s) );
1924 }
1925
1926 return 0;
1927}
1928
1929static struct seq_operations packet_seq_ops = {
1930 .start = packet_seq_start,
1931 .next = packet_seq_next,
1932 .stop = packet_seq_stop,
1933 .show = packet_seq_show,
1934};
1935
1936static int packet_seq_open(struct inode *inode, struct file *file)
1937{
1938 return seq_open(file, &packet_seq_ops);
1939}
1940
1941static struct file_operations packet_seq_fops = {
1942 .owner = THIS_MODULE,
1943 .open = packet_seq_open,
1944 .read = seq_read,
1945 .llseek = seq_lseek,
1946 .release = seq_release,
1947};
1948
1949#endif
1950
1951static void __exit packet_exit(void)
1952{
1953 proc_net_remove("packet");
1954 unregister_netdevice_notifier(&packet_netdev_notifier);
1955 sock_unregister(PF_PACKET);
1956 proto_unregister(&packet_proto);
1957}
1958
1959static int __init packet_init(void)
1960{
1961 int rc = proto_register(&packet_proto, 0);
1962
1963 if (rc != 0)
1964 goto out;
1965
1966 sock_register(&packet_family_ops);
1967 register_netdevice_notifier(&packet_netdev_notifier);
1968 proc_net_fops_create("packet", 0, &packet_seq_fops);
1969out:
1970 return rc;
1971}
1972
1973module_init(packet_init);
1974module_exit(packet_exit);
1975MODULE_LICENSE("GPL");
1976MODULE_ALIAS_NETPROTO(PF_PACKET);