blob: c620bd9ae3de96d2f597619b6fc7709cc7f8a74a [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 *
Jesper Juhl02c30a82005-05-05 16:16:16 -07008 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
11 *
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090012 * Fixes:
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * Alan Cox : verify_area() now used correctly
14 * Alan Cox : new skbuff lists, look ma no backlogs!
15 * Alan Cox : tidied skbuff lists.
16 * Alan Cox : Now uses generic datagram routines I
17 * added. Also fixed the peek/read crash
18 * from all old Linux datagram code.
19 * Alan Cox : Uses the improved datagram code.
20 * Alan Cox : Added NULL's for socket options.
21 * Alan Cox : Re-commented the code.
22 * Alan Cox : Use new kernel side addressing
23 * Rob Janssen : Correct MTU usage.
24 * Dave Platt : Counter leaks caused by incorrect
25 * interrupt locking and some slightly
26 * dubious gcc output. Can you read
27 * compiler: it said _VOLATILE_
28 * Richard Kooijman : Timestamp fixes.
29 * Alan Cox : New buffers. Use sk->mac.raw.
30 * Alan Cox : sendmsg/recvmsg support.
31 * Alan Cox : Protocol setting support
32 * Alexey Kuznetsov : Untied from IPv4 stack.
33 * Cyrus Durgin : Fixed kerneld for kmod.
34 * Michal Ostrowski : Module initialization cleanup.
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090035 * Ulises Alonso : Frame number limit removal and
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 * packet_set_ring memory leak.
Eric W. Biederman0fb375f2005-09-21 00:11:37 -070037 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090040 * byte arrays at the end of sockaddr_ll
Eric W. Biederman0fb375f2005-09-21 00:11:37 -070041 * and packet_mreq.
Johann Baudy69e3c752009-05-18 22:11:22 -070042 * Johann Baudy : Added TX RING.
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 *
44 * This program is free software; you can redistribute it and/or
45 * modify it under the terms of the GNU General Public License
46 * as published by the Free Software Foundation; either version
47 * 2 of the License, or (at your option) any later version.
48 *
49 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +090050
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/mm.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080053#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <linux/fcntl.h>
55#include <linux/socket.h>
56#include <linux/in.h>
57#include <linux/inet.h>
58#include <linux/netdevice.h>
59#include <linux/if_packet.h>
60#include <linux/wireless.h>
Herbert Xuffbc6112007-02-04 23:33:10 -080061#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/kmod.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020063#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#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 Viroa1f8e7f2006-10-19 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>
Herbert Xu905db442009-01-30 14:12:06 -080081#include <linux/mutex.h>
Eric Dumazet05423b22009-10-26 18:40:35 -070082#include <linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84#ifdef CONFIG_INET
85#include <net/inet_common.h>
86#endif
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 Assumptions:
90 - if device has no dev->hard_header routine, it adds and removes ll header
91 inside itself. In this case ll header is invisible outside of device,
92 but higher levels still should reserve dev->hard_header_len.
93 Some devices are enough clever to reallocate skb, when header
94 will not fit to reserved space (tunnel), another ones are silly
95 (PPP).
96 - packet socket receives packets with pulled ll header,
97 so that SOCK_RAW should push it back.
98
99On receive:
100-----------
101
102Incoming, dev->hard_header!=NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700103 mac_header -> ll header
104 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106Outgoing, dev->hard_header!=NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700107 mac_header -> ll header
108 data -> ll header
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110Incoming, dev->hard_header==NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700111 mac_header -> UNKNOWN position. It is very likely, that it points to ll
112 header. PPP makes it, that is wrong, because introduce
YOSHIFUJI Hideakidb0c58f2007-07-19 10:44:35 +0900113 assymetry between rx and tx paths.
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700114 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116Outgoing, dev->hard_header==NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700117 mac_header -> data. ll header is still not built!
118 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120Resume
121 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
122
123
124On transmit:
125------------
126
127dev->hard_header != NULL
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700128 mac_header -> ll header
129 data -> ll header
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131dev->hard_header == NULL (ll header is added by device, we cannot control it)
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700132 mac_header -> data
133 data -> data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
135 We should set nh.raw on output to correct posistion,
136 packet classifier depends on it.
137 */
138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139/* Private packet socket structures. */
140
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000141struct packet_mclist {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 struct packet_mclist *next;
143 int ifindex;
144 int count;
145 unsigned short type;
146 unsigned short alen;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -0700147 unsigned char addr[MAX_ADDR_LEN];
148};
149/* identical to struct packet_mreq except it has
150 * a longer address field.
151 */
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000152struct packet_mreq_max {
Eric W. Biederman0fb375f2005-09-21 00:11:37 -0700153 int mr_ifindex;
154 unsigned short mr_type;
155 unsigned short mr_alen;
156 unsigned char mr_address[MAX_ADDR_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157};
David S. Millera2efcfa2007-05-29 13:12:50 -0700158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159#ifdef CONFIG_PACKET_MMAP
Johann Baudy69e3c752009-05-18 22:11:22 -0700160static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
161 int closing, int tx_ring);
162
163struct packet_ring_buffer {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000164 char **pg_vec;
Johann Baudy69e3c752009-05-18 22:11:22 -0700165 unsigned int head;
166 unsigned int frames_per_block;
167 unsigned int frame_size;
168 unsigned int frame_max;
169
170 unsigned int pg_vec_order;
171 unsigned int pg_vec_pages;
172 unsigned int pg_vec_len;
173
174 atomic_t pending;
175};
176
177struct packet_sock;
178static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179#endif
180
181static void packet_flush_mclist(struct sock *sk);
182
183struct packet_sock {
184 /* struct sock has to be the first member of packet_sock */
185 struct sock sk;
186 struct tpacket_stats stats;
187#ifdef CONFIG_PACKET_MMAP
Johann Baudy69e3c752009-05-18 22:11:22 -0700188 struct packet_ring_buffer rx_ring;
189 struct packet_ring_buffer tx_ring;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 int copy_thresh;
191#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 spinlock_t bind_lock;
Herbert Xu905db442009-01-30 14:12:06 -0800193 struct mutex pg_vec_lock;
Herbert Xu8dc41942007-02-04 23:31:32 -0800194 unsigned int running:1, /* prot_hook is attached*/
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -0700195 auxdata:1,
196 origdev:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 int ifindex; /* bound device */
Al Viro0e11c912006-11-08 00:26:29 -0800198 __be16 num;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 struct packet_mclist *mclist;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200#ifdef CONFIG_PACKET_MMAP
201 atomic_t mapped;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700202 enum tpacket_versions tp_version;
203 unsigned int tp_hdrlen;
Patrick McHardy89133362008-07-18 18:05:19 -0700204 unsigned int tp_reserve;
Johann Baudy69e3c752009-05-18 22:11:22 -0700205 unsigned int tp_loss:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206#endif
Eric Dumazet94b05952009-10-16 04:02:20 +0000207 struct packet_type prot_hook ____cacheline_aligned_in_smp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208};
209
Herbert Xuffbc6112007-02-04 23:33:10 -0800210struct packet_skb_cb {
211 unsigned int origlen;
212 union {
213 struct sockaddr_pkt pkt;
214 struct sockaddr_ll ll;
215 } sa;
216};
217
218#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
Herbert Xu8dc41942007-02-04 23:31:32 -0800219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220#ifdef CONFIG_PACKET_MMAP
221
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700222static void __packet_set_status(struct packet_sock *po, void *frame, int status)
223{
224 union {
225 struct tpacket_hdr *h1;
226 struct tpacket2_hdr *h2;
227 void *raw;
228 } h;
229
230 h.raw = frame;
231 switch (po->tp_version) {
232 case TPACKET_V1:
233 h.h1->tp_status = status;
Johann Baudy69e3c752009-05-18 22:11:22 -0700234 flush_dcache_page(virt_to_page(&h.h1->tp_status));
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700235 break;
236 case TPACKET_V2:
237 h.h2->tp_status = status;
Johann Baudy69e3c752009-05-18 22:11:22 -0700238 flush_dcache_page(virt_to_page(&h.h2->tp_status));
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700239 break;
Johann Baudy69e3c752009-05-18 22:11:22 -0700240 default:
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000241 pr_err("TPACKET version not supported\n");
Johann Baudy69e3c752009-05-18 22:11:22 -0700242 BUG();
243 }
244
245 smp_wmb();
246}
247
248static int __packet_get_status(struct packet_sock *po, void *frame)
249{
250 union {
251 struct tpacket_hdr *h1;
252 struct tpacket2_hdr *h2;
253 void *raw;
254 } h;
255
256 smp_rmb();
257
258 h.raw = frame;
259 switch (po->tp_version) {
260 case TPACKET_V1:
261 flush_dcache_page(virt_to_page(&h.h1->tp_status));
262 return h.h1->tp_status;
263 case TPACKET_V2:
264 flush_dcache_page(virt_to_page(&h.h2->tp_status));
265 return h.h2->tp_status;
266 default:
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000267 pr_err("TPACKET version not supported\n");
Johann Baudy69e3c752009-05-18 22:11:22 -0700268 BUG();
269 return 0;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
Johann Baudy69e3c752009-05-18 22:11:22 -0700272
273static void *packet_lookup_frame(struct packet_sock *po,
274 struct packet_ring_buffer *rb,
275 unsigned int position,
276 int status)
277{
278 unsigned int pg_vec_pos, frame_offset;
279 union {
280 struct tpacket_hdr *h1;
281 struct tpacket2_hdr *h2;
282 void *raw;
283 } h;
284
285 pg_vec_pos = position / rb->frames_per_block;
286 frame_offset = position % rb->frames_per_block;
287
288 h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size);
289
290 if (status != __packet_get_status(po, h.raw))
291 return NULL;
292
293 return h.raw;
294}
295
296static inline void *packet_current_frame(struct packet_sock *po,
297 struct packet_ring_buffer *rb,
298 int status)
299{
300 return packet_lookup_frame(po, rb, rb->head, status);
301}
302
303static inline void *packet_previous_frame(struct packet_sock *po,
304 struct packet_ring_buffer *rb,
305 int status)
306{
307 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
308 return packet_lookup_frame(po, rb, previous, status);
309}
310
311static inline void packet_increment_head(struct packet_ring_buffer *buff)
312{
313 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
314}
315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316#endif
317
318static inline struct packet_sock *pkt_sk(struct sock *sk)
319{
320 return (struct packet_sock *)sk;
321}
322
323static void packet_sock_destruct(struct sock *sk)
324{
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700325 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
326 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 if (!sock_flag(sk, SOCK_DEAD)) {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000329 pr_err("Attempt to release alive packet socket: %p\n", sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 return;
331 }
332
Pavel Emelyanov17ab56a2007-11-10 21:38:48 -0800333 sk_refcnt_debug_dec(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334}
335
336
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800337static const struct proto_ops packet_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800339static const struct proto_ops packet_ops_spkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000341static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
342 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
344 struct sock *sk;
345 struct sockaddr_pkt *spkt;
346
347 /*
348 * When we registered the protocol we saved the socket in the data
349 * field for just this event.
350 */
351
352 sk = pt->af_packet_priv;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 /*
355 * Yank back the headers [hope the device set this
356 * right or kerboom...]
357 *
358 * Incoming packets have ll header pulled,
359 * push it back.
360 *
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -0700361 * For outgoing ones skb->data == skb_mac_header(skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 * so that this procedure is noop.
363 */
364
365 if (skb->pkt_type == PACKET_LOOPBACK)
366 goto out;
367
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900368 if (dev_net(dev) != sock_net(sk))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -0800369 goto out;
370
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000371 skb = skb_share_check(skb, GFP_ATOMIC);
372 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 goto oom;
374
375 /* drop any routing info */
Eric Dumazetadf30902009-06-02 05:19:30 +0000376 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Phil Oester84531c22005-07-12 11:57:52 -0700378 /* drop conntrack reference */
379 nf_reset(skb);
380
Herbert Xuffbc6112007-02-04 23:33:10 -0800381 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -0700383 skb_push(skb, skb->data - skb_mac_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385 /*
386 * The SOCK_PACKET socket receives _all_ frames.
387 */
388
389 spkt->spkt_family = dev->type;
390 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
391 spkt->spkt_protocol = skb->protocol;
392
393 /*
394 * Charge the memory to the socket. This is done specifically
395 * to prevent sockets using all the memory up.
396 */
397
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000398 if (sock_queue_rcv_skb(sk, skb) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 return 0;
400
401out:
402 kfree_skb(skb);
403oom:
404 return 0;
405}
406
407
408/*
409 * Output a raw packet to a device layer. This bypasses all the other
410 * protocol layers and you must therefore supply it with a complete frame
411 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
414 struct msghdr *msg, size_t len)
415{
416 struct sock *sk = sock->sk;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000417 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 struct sk_buff *skb;
419 struct net_device *dev;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000420 __be16 proto = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 int err;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900424 * Get and verify the address.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 */
426
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000427 if (saddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 if (msg->msg_namelen < sizeof(struct sockaddr))
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000429 return -EINVAL;
430 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
431 proto = saddr->spkt_protocol;
432 } else
433 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
435 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900436 * Find the device first to size check it
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 */
438
439 saddr->spkt_device[13] = 0;
Eric Dumazet654d1f82009-11-02 10:43:32 +0100440 rcu_read_lock();
441 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 err = -ENODEV;
443 if (dev == NULL)
444 goto out_unlock;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900445
David S. Millerd5e76b02007-01-25 19:30:36 -0800446 err = -ENETDOWN;
447 if (!(dev->flags & IFF_UP))
448 goto out_unlock;
449
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 /*
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000451 * You may not queue a frame bigger than the mtu. This is the lowest level
452 * raw protocol and you must do your own fragmentation at this level.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 err = -EMSGSIZE;
Kris Katterjohn8ae55f02006-01-23 16:28:02 -0800456 if (len > dev->mtu + dev->hard_header_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 goto out_unlock;
458
459 err = -ENOBUFS;
460 skb = sock_wmalloc(sk, len + LL_RESERVED_SPACE(dev), 0, GFP_KERNEL);
461
462 /*
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000463 * If the write buffer is full, then tough. At this level the user
464 * gets to deal with the problem - do your own algorithmic backoffs.
465 * That's far more flexible.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900467
468 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 goto out_unlock;
470
471 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900472 * Fill it in
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 /* FIXME: Save some space for broken drivers that write a
476 * hard header at transmission time by themselves. PPP is the
477 * notable one here. This should really be fixed at the driver level.
478 */
479 skb_reserve(skb, LL_RESERVED_SPACE(dev));
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700480 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482 /* Try to align data part correctly */
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700483 if (dev->header_ops) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 skb->data -= dev->hard_header_len;
485 skb->tail -= dev->hard_header_len;
486 if (len < dev->hard_header_len)
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700487 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 }
489
490 /* Returns -EFAULT on error */
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000491 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 skb->protocol = proto;
493 skb->dev = dev;
494 skb->priority = sk->sk_priority;
Eric Dumazet2d37a182009-10-01 19:14:46 +0000495 skb->mark = sk->sk_mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if (err)
497 goto out_free;
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 /*
500 * Now send it
501 */
502
503 dev_queue_xmit(skb);
Eric Dumazet654d1f82009-11-02 10:43:32 +0100504 rcu_read_unlock();
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000505 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507out_free:
508 kfree_skb(skb);
509out_unlock:
Eric Dumazet654d1f82009-11-02 10:43:32 +0100510 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 return err;
512}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
David S. Millerdbcb5852007-01-24 15:21:02 -0800514static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
515 unsigned int res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516{
517 struct sk_filter *filter;
518
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700519 rcu_read_lock_bh();
520 filter = rcu_dereference(sk->sk_filter);
David S. Millerdbcb5852007-01-24 15:21:02 -0800521 if (filter != NULL)
522 res = sk_run_filter(skb, filter->insns, filter->len);
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700523 rcu_read_unlock_bh();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
David S. Millerdbcb5852007-01-24 15:21:02 -0800525 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526}
527
528/*
529 This function makes lazy skb cloning in hope that most of packets
530 are discarded by BPF.
531
532 Note tricky part: we DO mangle shared skb! skb->data, skb->len
533 and skb->cb are mangled. It works because (and until) packets
534 falling here are owned by current CPU. Output packets are cloned
535 by dev_queue_xmit_nit(), input packets are processed by net_bh
536 sequencially, so that if we return skb to original state on exit,
537 we will not harm anyone.
538 */
539
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000540static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
541 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
543 struct sock *sk;
544 struct sockaddr_ll *sll;
545 struct packet_sock *po;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000546 u8 *skb_head = skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 int skb_len = skb->len;
David S. Millerdbcb5852007-01-24 15:21:02 -0800548 unsigned int snaplen, res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550 if (skb->pkt_type == PACKET_LOOPBACK)
551 goto drop;
552
553 sk = pt->af_packet_priv;
554 po = pkt_sk(sk);
555
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900556 if (dev_net(dev) != sock_net(sk))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -0800557 goto drop;
558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 skb->dev = dev;
560
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700561 if (dev->header_ops) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 /* The device has an explicit notion of ll header,
563 exported to higher levels.
564
565 Otherwise, the device hides datails of it frame
566 structure, so that corresponding packet head
567 never delivered to user.
568 */
569 if (sk->sk_type != SOCK_DGRAM)
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -0700570 skb_push(skb, skb->data - skb_mac_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 else if (skb->pkt_type == PACKET_OUTGOING) {
572 /* Special case: outgoing packets have ll header at head */
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -0300573 skb_pull(skb, skb_network_offset(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 }
575 }
576
577 snaplen = skb->len;
578
David S. Millerdbcb5852007-01-24 15:21:02 -0800579 res = run_filter(skb, sk, snaplen);
580 if (!res)
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700581 goto drop_n_restore;
David S. Millerdbcb5852007-01-24 15:21:02 -0800582 if (snaplen > res)
583 snaplen = res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
585 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
586 (unsigned)sk->sk_rcvbuf)
587 goto drop_n_acct;
588
589 if (skb_shared(skb)) {
590 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
591 if (nskb == NULL)
592 goto drop_n_acct;
593
594 if (skb_head != skb->data) {
595 skb->data = skb_head;
596 skb->len = skb_len;
597 }
598 kfree_skb(skb);
599 skb = nskb;
600 }
601
Herbert Xuffbc6112007-02-04 23:33:10 -0800602 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
603 sizeof(skb->cb));
604
605 sll = &PACKET_SKB_CB(skb)->sa.ll;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 sll->sll_family = AF_PACKET;
607 sll->sll_hatype = dev->type;
608 sll->sll_protocol = skb->protocol;
609 sll->sll_pkttype = skb->pkt_type;
Peter P Waskiewicz Jr8032b462007-11-10 22:03:25 -0800610 if (unlikely(po->origdev))
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -0700611 sll->sll_ifindex = orig_dev->ifindex;
612 else
613 sll->sll_ifindex = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Stephen Hemmingerb95cce32007-09-26 22:13:38 -0700615 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Herbert Xuffbc6112007-02-04 23:33:10 -0800617 PACKET_SKB_CB(skb)->origlen = skb->len;
Herbert Xu8dc41942007-02-04 23:31:32 -0800618
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 if (pskb_trim(skb, snaplen))
620 goto drop_n_acct;
621
622 skb_set_owner_r(skb, sk);
623 skb->dev = NULL;
Eric Dumazetadf30902009-06-02 05:19:30 +0000624 skb_dst_drop(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Phil Oester84531c22005-07-12 11:57:52 -0700626 /* drop conntrack reference */
627 nf_reset(skb);
628
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 spin_lock(&sk->sk_receive_queue.lock);
630 po->stats.tp_packets++;
Neil Horman3b885782009-10-12 13:26:31 -0700631 skb->dropcount = atomic_read(&sk->sk_drops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 __skb_queue_tail(&sk->sk_receive_queue, skb);
633 spin_unlock(&sk->sk_receive_queue.lock);
634 sk->sk_data_ready(sk, skb->len);
635 return 0;
636
637drop_n_acct:
Neil Horman3b885782009-10-12 13:26:31 -0700638 po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640drop_n_restore:
641 if (skb_head != skb->data && skb_shared(skb)) {
642 skb->data = skb_head;
643 skb->len = skb_len;
644 }
645drop:
Neil Hormanead2ceb2009-03-11 09:49:55 +0000646 consume_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 return 0;
648}
649
650#ifdef CONFIG_PACKET_MMAP
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000651static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
652 struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653{
654 struct sock *sk;
655 struct packet_sock *po;
656 struct sockaddr_ll *sll;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700657 union {
658 struct tpacket_hdr *h1;
659 struct tpacket2_hdr *h2;
660 void *raw;
661 } h;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000662 u8 *skb_head = skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 int skb_len = skb->len;
David S. Millerdbcb5852007-01-24 15:21:02 -0800664 unsigned int snaplen, res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700666 unsigned short macoff, netoff, hdrlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 struct sk_buff *copy_skb = NULL;
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700668 struct timeval tv;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700669 struct timespec ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
671 if (skb->pkt_type == PACKET_LOOPBACK)
672 goto drop;
673
674 sk = pt->af_packet_priv;
675 po = pkt_sk(sk);
676
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900677 if (dev_net(dev) != sock_net(sk))
Denis V. Lunevd12d01d2007-11-19 22:28:35 -0800678 goto drop;
679
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700680 if (dev->header_ops) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 if (sk->sk_type != SOCK_DGRAM)
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -0700682 skb_push(skb, skb->data - skb_mac_header(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 else if (skb->pkt_type == PACKET_OUTGOING) {
684 /* Special case: outgoing packets have ll header at head */
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -0300685 skb_pull(skb, skb_network_offset(skb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 }
687 }
688
Herbert Xu8dc41942007-02-04 23:31:32 -0800689 if (skb->ip_summed == CHECKSUM_PARTIAL)
690 status |= TP_STATUS_CSUMNOTREADY;
691
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 snaplen = skb->len;
693
David S. Millerdbcb5852007-01-24 15:21:02 -0800694 res = run_filter(skb, sk, snaplen);
695 if (!res)
Dmitry Mishinfda9ef52006-08-31 15:28:39 -0700696 goto drop_n_restore;
David S. Millerdbcb5852007-01-24 15:21:02 -0800697 if (snaplen > res)
698 snaplen = res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700 if (sk->sk_type == SOCK_DGRAM) {
Patrick McHardy89133362008-07-18 18:05:19 -0700701 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
702 po->tp_reserve;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 } else {
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -0300704 unsigned maclen = skb_network_offset(skb);
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700705 netoff = TPACKET_ALIGN(po->tp_hdrlen +
Patrick McHardy89133362008-07-18 18:05:19 -0700706 (maclen < 16 ? 16 : maclen)) +
707 po->tp_reserve;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 macoff = netoff - maclen;
709 }
710
Johann Baudy69e3c752009-05-18 22:11:22 -0700711 if (macoff + snaplen > po->rx_ring.frame_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 if (po->copy_thresh &&
713 atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
714 (unsigned)sk->sk_rcvbuf) {
715 if (skb_shared(skb)) {
716 copy_skb = skb_clone(skb, GFP_ATOMIC);
717 } else {
718 copy_skb = skb_get(skb);
719 skb_head = skb->data;
720 }
721 if (copy_skb)
722 skb_set_owner_r(copy_skb, sk);
723 }
Johann Baudy69e3c752009-05-18 22:11:22 -0700724 snaplen = po->rx_ring.frame_size - macoff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 if ((int)snaplen < 0)
726 snaplen = 0;
727 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
729 spin_lock(&sk->sk_receive_queue.lock);
Johann Baudy69e3c752009-05-18 22:11:22 -0700730 h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700731 if (!h.raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 goto ring_is_full;
Johann Baudy69e3c752009-05-18 22:11:22 -0700733 packet_increment_head(&po->rx_ring);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 po->stats.tp_packets++;
735 if (copy_skb) {
736 status |= TP_STATUS_COPY;
737 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
738 }
739 if (!po->stats.tp_drops)
740 status &= ~TP_STATUS_LOSING;
741 spin_unlock(&sk->sk_receive_queue.lock);
742
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700743 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700745 switch (po->tp_version) {
746 case TPACKET_V1:
747 h.h1->tp_len = skb->len;
748 h.h1->tp_snaplen = snaplen;
749 h.h1->tp_mac = macoff;
750 h.h1->tp_net = netoff;
751 if (skb->tstamp.tv64)
752 tv = ktime_to_timeval(skb->tstamp);
753 else
754 do_gettimeofday(&tv);
755 h.h1->tp_sec = tv.tv_sec;
756 h.h1->tp_usec = tv.tv_usec;
757 hdrlen = sizeof(*h.h1);
758 break;
759 case TPACKET_V2:
760 h.h2->tp_len = skb->len;
761 h.h2->tp_snaplen = snaplen;
762 h.h2->tp_mac = macoff;
763 h.h2->tp_net = netoff;
764 if (skb->tstamp.tv64)
765 ts = ktime_to_timespec(skb->tstamp);
766 else
767 getnstimeofday(&ts);
768 h.h2->tp_sec = ts.tv_sec;
769 h.h2->tp_nsec = ts.tv_nsec;
Eric Dumazet05423b22009-10-26 18:40:35 -0700770 h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700771 hdrlen = sizeof(*h.h2);
772 break;
773 default:
774 BUG();
775 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700777 sll = h.raw + TPACKET_ALIGN(hdrlen);
Stephen Hemmingerb95cce32007-09-26 22:13:38 -0700778 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 sll->sll_family = AF_PACKET;
780 sll->sll_hatype = dev->type;
781 sll->sll_protocol = skb->protocol;
782 sll->sll_pkttype = skb->pkt_type;
Peter P Waskiewicz Jr8032b462007-11-10 22:03:25 -0800783 if (unlikely(po->origdev))
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -0700784 sll->sll_ifindex = orig_dev->ifindex;
785 else
786 sll->sll_ifindex = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700788 __packet_set_status(po, h.raw, status);
Ralf Baechlee16aa202006-12-07 00:11:33 -0800789 smp_mb();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 {
791 struct page *p_start, *p_end;
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700792 u8 *h_end = h.raw + macoff + snaplen - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
Patrick McHardybbd6ef82008-07-14 22:50:15 -0700794 p_start = virt_to_page(h.raw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 p_end = virt_to_page(h_end);
796 while (p_start <= p_end) {
797 flush_dcache_page(p_start);
798 p_start++;
799 }
800 }
801
802 sk->sk_data_ready(sk, 0);
803
804drop_n_restore:
805 if (skb_head != skb->data && skb_shared(skb)) {
806 skb->data = skb_head;
807 skb->len = skb_len;
808 }
809drop:
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +0900810 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 return 0;
812
813ring_is_full:
814 po->stats.tp_drops++;
815 spin_unlock(&sk->sk_receive_queue.lock);
816
817 sk->sk_data_ready(sk, 0);
Wei Yongjunacb5d752009-02-25 00:36:42 +0000818 kfree_skb(copy_skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 goto drop_n_restore;
820}
821
Johann Baudy69e3c752009-05-18 22:11:22 -0700822static void tpacket_destruct_skb(struct sk_buff *skb)
823{
824 struct packet_sock *po = pkt_sk(skb->sk);
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000825 void *ph;
Johann Baudy69e3c752009-05-18 22:11:22 -0700826
827 BUG_ON(skb == NULL);
828
829 if (likely(po->tx_ring.pg_vec)) {
830 ph = skb_shinfo(skb)->destructor_arg;
831 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
832 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
833 atomic_dec(&po->tx_ring.pending);
834 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
835 }
836
837 sock_wfree(skb);
838}
839
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000840static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
841 void *frame, struct net_device *dev, int size_max,
842 __be16 proto, unsigned char *addr)
Johann Baudy69e3c752009-05-18 22:11:22 -0700843{
844 union {
845 struct tpacket_hdr *h1;
846 struct tpacket2_hdr *h2;
847 void *raw;
848 } ph;
849 int to_write, offset, len, tp_len, nr_frags, len_max;
850 struct socket *sock = po->sk.sk_socket;
851 struct page *page;
852 void *data;
853 int err;
854
855 ph.raw = frame;
856
857 skb->protocol = proto;
858 skb->dev = dev;
859 skb->priority = po->sk.sk_priority;
Eric Dumazet2d37a182009-10-01 19:14:46 +0000860 skb->mark = po->sk.sk_mark;
Johann Baudy69e3c752009-05-18 22:11:22 -0700861 skb_shinfo(skb)->destructor_arg = ph.raw;
862
863 switch (po->tp_version) {
864 case TPACKET_V2:
865 tp_len = ph.h2->tp_len;
866 break;
867 default:
868 tp_len = ph.h1->tp_len;
869 break;
870 }
871 if (unlikely(tp_len > size_max)) {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000872 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
Johann Baudy69e3c752009-05-18 22:11:22 -0700873 return -EMSGSIZE;
874 }
875
876 skb_reserve(skb, LL_RESERVED_SPACE(dev));
877 skb_reset_network_header(skb);
878
879 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
880 to_write = tp_len;
881
882 if (sock->type == SOCK_DGRAM) {
883 err = dev_hard_header(skb, dev, ntohs(proto), addr,
884 NULL, tp_len);
885 if (unlikely(err < 0))
886 return -EINVAL;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000887 } else if (dev->hard_header_len) {
Johann Baudy69e3c752009-05-18 22:11:22 -0700888 /* net device doesn't like empty head */
889 if (unlikely(tp_len <= dev->hard_header_len)) {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000890 pr_err("packet size is too short (%d < %d)\n",
891 tp_len, dev->hard_header_len);
Johann Baudy69e3c752009-05-18 22:11:22 -0700892 return -EINVAL;
893 }
894
895 skb_push(skb, dev->hard_header_len);
896 err = skb_store_bits(skb, 0, data,
897 dev->hard_header_len);
898 if (unlikely(err))
899 return err;
900
901 data += dev->hard_header_len;
902 to_write -= dev->hard_header_len;
903 }
904
905 err = -EFAULT;
906 page = virt_to_page(data);
907 offset = offset_in_page(data);
908 len_max = PAGE_SIZE - offset;
909 len = ((to_write > len_max) ? len_max : to_write);
910
911 skb->data_len = to_write;
912 skb->len += to_write;
913 skb->truesize += to_write;
914 atomic_add(to_write, &po->sk.sk_wmem_alloc);
915
916 while (likely(to_write)) {
917 nr_frags = skb_shinfo(skb)->nr_frags;
918
919 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000920 pr_err("Packet exceed the number of skb frags(%lu)\n",
921 MAX_SKB_FRAGS);
Johann Baudy69e3c752009-05-18 22:11:22 -0700922 return -EFAULT;
923 }
924
925 flush_dcache_page(page);
926 get_page(page);
927 skb_fill_page_desc(skb,
928 nr_frags,
929 page++, offset, len);
930 to_write -= len;
931 offset = 0;
932 len_max = PAGE_SIZE;
933 len = ((to_write > len_max) ? len_max : to_write);
934 }
935
936 return tp_len;
937}
938
939static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
940{
941 struct socket *sock;
942 struct sk_buff *skb;
943 struct net_device *dev;
944 __be16 proto;
945 int ifindex, err, reserve = 0;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +0000946 void *ph;
947 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
Johann Baudy69e3c752009-05-18 22:11:22 -0700948 int tp_len, size_max;
949 unsigned char *addr;
950 int len_sum = 0;
951 int status = 0;
952
953 sock = po->sk.sk_socket;
954
955 mutex_lock(&po->pg_vec_lock);
956
957 err = -EBUSY;
958 if (saddr == NULL) {
959 ifindex = po->ifindex;
960 proto = po->num;
961 addr = NULL;
962 } else {
963 err = -EINVAL;
964 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
965 goto out;
966 if (msg->msg_namelen < (saddr->sll_halen
967 + offsetof(struct sockaddr_ll,
968 sll_addr)))
969 goto out;
970 ifindex = saddr->sll_ifindex;
971 proto = saddr->sll_protocol;
972 addr = saddr->sll_addr;
973 }
974
975 dev = dev_get_by_index(sock_net(&po->sk), ifindex);
976 err = -ENXIO;
977 if (unlikely(dev == NULL))
978 goto out;
979
980 reserve = dev->hard_header_len;
981
982 err = -ENETDOWN;
983 if (unlikely(!(dev->flags & IFF_UP)))
984 goto out_put;
985
986 size_max = po->tx_ring.frame_size
Gabor Gombasb5dd8842009-10-29 03:19:11 -0700987 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
Johann Baudy69e3c752009-05-18 22:11:22 -0700988
989 if (size_max > dev->mtu + reserve)
990 size_max = dev->mtu + reserve;
991
992 do {
993 ph = packet_current_frame(po, &po->tx_ring,
994 TP_STATUS_SEND_REQUEST);
995
996 if (unlikely(ph == NULL)) {
997 schedule();
998 continue;
999 }
1000
1001 status = TP_STATUS_SEND_REQUEST;
1002 skb = sock_alloc_send_skb(&po->sk,
1003 LL_ALLOCATED_SPACE(dev)
1004 + sizeof(struct sockaddr_ll),
1005 0, &err);
1006
1007 if (unlikely(skb == NULL))
1008 goto out_status;
1009
1010 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1011 addr);
1012
1013 if (unlikely(tp_len < 0)) {
1014 if (po->tp_loss) {
1015 __packet_set_status(po, ph,
1016 TP_STATUS_AVAILABLE);
1017 packet_increment_head(&po->tx_ring);
1018 kfree_skb(skb);
1019 continue;
1020 } else {
1021 status = TP_STATUS_WRONG_FORMAT;
1022 err = tp_len;
1023 goto out_status;
1024 }
1025 }
1026
1027 skb->destructor = tpacket_destruct_skb;
1028 __packet_set_status(po, ph, TP_STATUS_SENDING);
1029 atomic_inc(&po->tx_ring.pending);
1030
1031 status = TP_STATUS_SEND_REQUEST;
1032 err = dev_queue_xmit(skb);
1033 if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0))
1034 goto out_xmit;
1035 packet_increment_head(&po->tx_ring);
1036 len_sum += tp_len;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001037 } while (likely((ph != NULL) || ((!(msg->msg_flags & MSG_DONTWAIT))
Johann Baudy69e3c752009-05-18 22:11:22 -07001038 && (atomic_read(&po->tx_ring.pending))))
1039 );
1040
1041 err = len_sum;
1042 goto out_put;
1043
1044out_xmit:
1045 skb->destructor = sock_wfree;
1046 atomic_dec(&po->tx_ring.pending);
1047out_status:
1048 __packet_set_status(po, ph, status);
1049 kfree_skb(skb);
1050out_put:
1051 dev_put(dev);
1052out:
1053 mutex_unlock(&po->pg_vec_lock);
1054 return err;
1055}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056#endif
1057
Johann Baudy69e3c752009-05-18 22:11:22 -07001058static int packet_snd(struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 struct msghdr *msg, size_t len)
1060{
1061 struct sock *sk = sock->sk;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001062 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 struct sk_buff *skb;
1064 struct net_device *dev;
Al Viro0e11c912006-11-08 00:26:29 -08001065 __be16 proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 unsigned char *addr;
1067 int ifindex, err, reserve = 0;
1068
1069 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001070 * Get and verify the address.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001072
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 if (saddr == NULL) {
1074 struct packet_sock *po = pkt_sk(sk);
1075
1076 ifindex = po->ifindex;
1077 proto = po->num;
1078 addr = NULL;
1079 } else {
1080 err = -EINVAL;
1081 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1082 goto out;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001083 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1084 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 ifindex = saddr->sll_ifindex;
1086 proto = saddr->sll_protocol;
1087 addr = saddr->sll_addr;
1088 }
1089
1090
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001091 dev = dev_get_by_index(sock_net(sk), ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 err = -ENXIO;
1093 if (dev == NULL)
1094 goto out_unlock;
1095 if (sock->type == SOCK_RAW)
1096 reserve = dev->hard_header_len;
1097
David S. Millerd5e76b02007-01-25 19:30:36 -08001098 err = -ENETDOWN;
1099 if (!(dev->flags & IFF_UP))
1100 goto out_unlock;
1101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 err = -EMSGSIZE;
1103 if (len > dev->mtu+reserve)
1104 goto out_unlock;
1105
Johannes Bergf5184d22008-05-12 20:48:31 -07001106 skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 msg->msg_flags & MSG_DONTWAIT, &err);
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001108 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 goto out_unlock;
1110
1111 skb_reserve(skb, LL_RESERVED_SPACE(dev));
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -07001112 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113
Stephen Hemminger0c4e8582007-10-09 01:36:32 -07001114 err = -EINVAL;
1115 if (sock->type == SOCK_DGRAM &&
1116 dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
1117 goto out_free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118
1119 /* Returns -EFAULT on error */
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001120 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 if (err)
1122 goto out_free;
1123
1124 skb->protocol = proto;
1125 skb->dev = dev;
1126 skb->priority = sk->sk_priority;
Eric Dumazet2d37a182009-10-01 19:14:46 +00001127 skb->mark = sk->sk_mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 /*
1130 * Now send it
1131 */
1132
1133 err = dev_queue_xmit(skb);
1134 if (err > 0 && (err = net_xmit_errno(err)) != 0)
1135 goto out_unlock;
1136
1137 dev_put(dev);
1138
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001139 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140
1141out_free:
1142 kfree_skb(skb);
1143out_unlock:
1144 if (dev)
1145 dev_put(dev);
1146out:
1147 return err;
1148}
1149
Johann Baudy69e3c752009-05-18 22:11:22 -07001150static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1151 struct msghdr *msg, size_t len)
1152{
1153#ifdef CONFIG_PACKET_MMAP
1154 struct sock *sk = sock->sk;
1155 struct packet_sock *po = pkt_sk(sk);
1156 if (po->tx_ring.pg_vec)
1157 return tpacket_snd(po, msg);
1158 else
1159#endif
1160 return packet_snd(sock, msg, len);
1161}
1162
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163/*
1164 * Close a PACKET socket. This is fairly simple. We immediately go
1165 * to 'closed' state and remove our protocol entry in the device list.
1166 */
1167
1168static int packet_release(struct socket *sock)
1169{
1170 struct sock *sk = sock->sk;
1171 struct packet_sock *po;
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08001172 struct net *net;
Johann Baudy69e3c752009-05-18 22:11:22 -07001173#ifdef CONFIG_PACKET_MMAP
1174 struct tpacket_req req;
1175#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176
1177 if (!sk)
1178 return 0;
1179
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001180 net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 po = pkt_sk(sk);
1182
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08001183 write_lock_bh(&net->packet.sklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 sk_del_node_init(sk);
Eric Dumazet920de802008-11-24 00:09:29 -08001185 sock_prot_inuse_add(net, sk->sk_prot, -1);
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08001186 write_unlock_bh(&net->packet.sklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187
1188 /*
1189 * Unhook packet receive handler.
1190 */
1191
1192 if (po->running) {
1193 /*
1194 * Remove the protocol hook
1195 */
1196 dev_remove_pack(&po->prot_hook);
1197 po->running = 0;
1198 po->num = 0;
1199 __sock_put(sk);
1200 }
1201
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 packet_flush_mclist(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
1204#ifdef CONFIG_PACKET_MMAP
Johann Baudy69e3c752009-05-18 22:11:22 -07001205 memset(&req, 0, sizeof(req));
1206
1207 if (po->rx_ring.pg_vec)
1208 packet_set_ring(sk, &req, 1, 0);
1209
1210 if (po->tx_ring.pg_vec)
1211 packet_set_ring(sk, &req, 1, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212#endif
1213
1214 /*
1215 * Now the socket is dead. No more input will appear.
1216 */
1217
1218 sock_orphan(sk);
1219 sock->sk = NULL;
1220
1221 /* Purge queues */
1222
1223 skb_queue_purge(&sk->sk_receive_queue);
Pavel Emelyanov17ab56a2007-11-10 21:38:48 -08001224 sk_refcnt_debug_release(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225
1226 sock_put(sk);
1227 return 0;
1228}
1229
1230/*
1231 * Attach a packet hook.
1232 */
1233
Al Viro0e11c912006-11-08 00:26:29 -08001234static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235{
1236 struct packet_sock *po = pkt_sk(sk);
1237 /*
1238 * Detach an existing hook if present.
1239 */
1240
1241 lock_sock(sk);
1242
1243 spin_lock(&po->bind_lock);
1244 if (po->running) {
1245 __sock_put(sk);
1246 po->running = 0;
1247 po->num = 0;
1248 spin_unlock(&po->bind_lock);
1249 dev_remove_pack(&po->prot_hook);
1250 spin_lock(&po->bind_lock);
1251 }
1252
1253 po->num = protocol;
1254 po->prot_hook.type = protocol;
1255 po->prot_hook.dev = dev;
1256
1257 po->ifindex = dev ? dev->ifindex : 0;
1258
1259 if (protocol == 0)
1260 goto out_unlock;
1261
Urs Thuermannbe85d4a2007-11-12 21:05:20 -08001262 if (!dev || (dev->flags & IFF_UP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 dev_add_pack(&po->prot_hook);
1264 sock_hold(sk);
1265 po->running = 1;
Urs Thuermannbe85d4a2007-11-12 21:05:20 -08001266 } else {
1267 sk->sk_err = ENETDOWN;
1268 if (!sock_flag(sk, SOCK_DEAD))
1269 sk->sk_error_report(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 }
1271
1272out_unlock:
1273 spin_unlock(&po->bind_lock);
1274 release_sock(sk);
1275 return 0;
1276}
1277
1278/*
1279 * Bind a packet socket to a device
1280 */
1281
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001282static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
1283 int addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284{
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001285 struct sock *sk = sock->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 char name[15];
1287 struct net_device *dev;
1288 int err = -ENODEV;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001289
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 /*
1291 * Check legality
1292 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001293
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001294 if (addr_len != sizeof(struct sockaddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 return -EINVAL;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001296 strlcpy(name, uaddr->sa_data, sizeof(name));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001298 dev = dev_get_by_name(sock_net(sk), name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 if (dev) {
1300 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1301 dev_put(dev);
1302 }
1303 return err;
1304}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305
1306static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1307{
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001308 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1309 struct sock *sk = sock->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 struct net_device *dev = NULL;
1311 int err;
1312
1313
1314 /*
1315 * Check legality
1316 */
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001317
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 if (addr_len < sizeof(struct sockaddr_ll))
1319 return -EINVAL;
1320 if (sll->sll_family != AF_PACKET)
1321 return -EINVAL;
1322
1323 if (sll->sll_ifindex) {
1324 err = -ENODEV;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001325 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 if (dev == NULL)
1327 goto out;
1328 }
1329 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1330 if (dev)
1331 dev_put(dev);
1332
1333out:
1334 return err;
1335}
1336
1337static struct proto packet_proto = {
1338 .name = "PACKET",
1339 .owner = THIS_MODULE,
1340 .obj_size = sizeof(struct packet_sock),
1341};
1342
1343/*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001344 * Create a packet of type SOCK_PACKET.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 */
1346
Eric Paris3f378b62009-11-05 22:18:14 -08001347static int packet_create(struct net *net, struct socket *sock, int protocol,
1348 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349{
1350 struct sock *sk;
1351 struct packet_sock *po;
Al Viro0e11c912006-11-08 00:26:29 -08001352 __be16 proto = (__force __be16)protocol; /* weird, but documented */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 int err;
1354
1355 if (!capable(CAP_NET_RAW))
1356 return -EPERM;
David S. Millerbe020972007-05-29 13:16:31 -07001357 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1358 sock->type != SOCK_PACKET)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 return -ESOCKTNOSUPPORT;
1360
1361 sock->state = SS_UNCONNECTED;
1362
1363 err = -ENOBUFS;
Pavel Emelyanov6257ff22007-11-01 00:39:31 -07001364 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 if (sk == NULL)
1366 goto out;
1367
1368 sock->ops = &packet_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 if (sock->type == SOCK_PACKET)
1370 sock->ops = &packet_ops_spkt;
David S. Millerbe020972007-05-29 13:16:31 -07001371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 sock_init_data(sock, sk);
1373
1374 po = pkt_sk(sk);
1375 sk->sk_family = PF_PACKET;
Al Viro0e11c912006-11-08 00:26:29 -08001376 po->num = proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377
1378 sk->sk_destruct = packet_sock_destruct;
Pavel Emelyanov17ab56a2007-11-10 21:38:48 -08001379 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380
1381 /*
1382 * Attach a protocol block
1383 */
1384
1385 spin_lock_init(&po->bind_lock);
Herbert Xu905db442009-01-30 14:12:06 -08001386 mutex_init(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 po->prot_hook.func = packet_rcv;
David S. Millerbe020972007-05-29 13:16:31 -07001388
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 if (sock->type == SOCK_PACKET)
1390 po->prot_hook.func = packet_rcv_spkt;
David S. Millerbe020972007-05-29 13:16:31 -07001391
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 po->prot_hook.af_packet_priv = sk;
1393
Al Viro0e11c912006-11-08 00:26:29 -08001394 if (proto) {
1395 po->prot_hook.type = proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 dev_add_pack(&po->prot_hook);
1397 sock_hold(sk);
1398 po->running = 1;
1399 }
1400
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08001401 write_lock_bh(&net->packet.sklist_lock);
1402 sk_add_node(sk, &net->packet.sklist);
Eric Dumazet36804532008-11-19 14:25:35 -08001403 sock_prot_inuse_add(net, &packet_proto, 1);
Eric Dumazet920de802008-11-24 00:09:29 -08001404 write_unlock_bh(&net->packet.sklist_lock);
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001405 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406out:
1407 return err;
1408}
1409
1410/*
1411 * Pull a packet from our receive queue and hand it to the user.
1412 * If necessary we block.
1413 */
1414
1415static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1416 struct msghdr *msg, size_t len, int flags)
1417{
1418 struct sock *sk = sock->sk;
1419 struct sk_buff *skb;
1420 int copied, err;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001421 struct sockaddr_ll *sll;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422
1423 err = -EINVAL;
1424 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
1425 goto out;
1426
1427#if 0
1428 /* What error should we return now? EUNATTACH? */
1429 if (pkt_sk(sk)->ifindex < 0)
1430 return -ENODEV;
1431#endif
1432
1433 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 * Call the generic datagram receiver. This handles all sorts
1435 * of horrible races and re-entrancy so we can forget about it
1436 * in the protocol layers.
1437 *
1438 * Now it will return ENETDOWN, if device have just gone down,
1439 * but then it will block.
1440 */
1441
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001442 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443
1444 /*
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001445 * An error occurred so return it. Because skb_recv_datagram()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 * handles the blocking we don't see and worry about blocking
1447 * retries.
1448 */
1449
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001450 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 goto out;
1452
1453 /*
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001454 * If the address length field is there to be filled in, we fill
1455 * it in now.
1456 */
1457
Herbert Xuffbc6112007-02-04 23:33:10 -08001458 sll = &PACKET_SKB_CB(skb)->sa.ll;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001459 if (sock->type == SOCK_PACKET)
1460 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1461 else
1462 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1463
1464 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 * You lose any data beyond the buffer you gave. If it worries a
1466 * user program they can ask the device for its MTU anyway.
1467 */
1468
1469 copied = skb->len;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001470 if (copied > len) {
1471 copied = len;
1472 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 }
1474
1475 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1476 if (err)
1477 goto out_free;
1478
Neil Horman3b885782009-10-12 13:26:31 -07001479 sock_recv_ts_and_drops(msg, sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
1481 if (msg->msg_name)
Herbert Xuffbc6112007-02-04 23:33:10 -08001482 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1483 msg->msg_namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
Herbert Xu8dc41942007-02-04 23:31:32 -08001485 if (pkt_sk(sk)->auxdata) {
Herbert Xuffbc6112007-02-04 23:33:10 -08001486 struct tpacket_auxdata aux;
1487
1488 aux.tp_status = TP_STATUS_USER;
1489 if (skb->ip_summed == CHECKSUM_PARTIAL)
1490 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1491 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1492 aux.tp_snaplen = skb->len;
1493 aux.tp_mac = 0;
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -03001494 aux.tp_net = skb_network_offset(skb);
Eric Dumazet05423b22009-10-26 18:40:35 -07001495 aux.tp_vlan_tci = vlan_tx_tag_get(skb);
Herbert Xuffbc6112007-02-04 23:33:10 -08001496
1497 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
Herbert Xu8dc41942007-02-04 23:31:32 -08001498 }
1499
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 /*
1501 * Free or return the buffer as appropriate. Again this
1502 * hides all the races and re-entrancy issues from us.
1503 */
1504 err = (flags&MSG_TRUNC) ? skb->len : copied;
1505
1506out_free:
1507 skb_free_datagram(sk, skb);
1508out:
1509 return err;
1510}
1511
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1513 int *uaddr_len, int peer)
1514{
1515 struct net_device *dev;
1516 struct sock *sk = sock->sk;
1517
1518 if (peer)
1519 return -EOPNOTSUPP;
1520
1521 uaddr->sa_family = AF_PACKET;
Eric Dumazet654d1f82009-11-02 10:43:32 +01001522 rcu_read_lock();
1523 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
1524 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 strlcpy(uaddr->sa_data, dev->name, 15);
Eric Dumazet654d1f82009-11-02 10:43:32 +01001526 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 memset(uaddr->sa_data, 0, 14);
Eric Dumazet654d1f82009-11-02 10:43:32 +01001528 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 *uaddr_len = sizeof(*uaddr);
1530
1531 return 0;
1532}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533
1534static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1535 int *uaddr_len, int peer)
1536{
1537 struct net_device *dev;
1538 struct sock *sk = sock->sk;
1539 struct packet_sock *po = pkt_sk(sk);
Cyrill Gorcunov13cfa972009-11-08 05:51:19 +00001540 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541
1542 if (peer)
1543 return -EOPNOTSUPP;
1544
1545 sll->sll_family = AF_PACKET;
1546 sll->sll_ifindex = po->ifindex;
1547 sll->sll_protocol = po->num;
Eric Dumazet654d1f82009-11-02 10:43:32 +01001548 rcu_read_lock();
1549 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 if (dev) {
1551 sll->sll_hatype = dev->type;
1552 sll->sll_halen = dev->addr_len;
1553 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 } else {
1555 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1556 sll->sll_halen = 0;
1557 }
Eric Dumazet654d1f82009-11-02 10:43:32 +01001558 rcu_read_unlock();
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001559 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560
1561 return 0;
1562}
1563
Wang Chen2aeb0b82008-07-14 20:49:46 -07001564static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1565 int what)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566{
1567 switch (i->type) {
1568 case PACKET_MR_MULTICAST:
1569 if (what > 0)
Eric W. Biedermand95ed922009-05-19 18:27:17 +00001570 return dev_mc_add(dev, i->addr, i->alen, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 else
Eric W. Biedermand95ed922009-05-19 18:27:17 +00001572 return dev_mc_delete(dev, i->addr, i->alen, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 break;
1574 case PACKET_MR_PROMISC:
Wang Chen2aeb0b82008-07-14 20:49:46 -07001575 return dev_set_promiscuity(dev, what);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 break;
1577 case PACKET_MR_ALLMULTI:
Wang Chen2aeb0b82008-07-14 20:49:46 -07001578 return dev_set_allmulti(dev, what);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 break;
Eric W. Biedermand95ed922009-05-19 18:27:17 +00001580 case PACKET_MR_UNICAST:
1581 if (what > 0)
Jiri Pirkoccffad22009-05-22 23:22:17 +00001582 return dev_unicast_add(dev, i->addr);
Eric W. Biedermand95ed922009-05-19 18:27:17 +00001583 else
Jiri Pirkoccffad22009-05-22 23:22:17 +00001584 return dev_unicast_delete(dev, i->addr);
Eric W. Biedermand95ed922009-05-19 18:27:17 +00001585 break;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001586 default:
1587 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 }
Wang Chen2aeb0b82008-07-14 20:49:46 -07001589 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590}
1591
1592static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1593{
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001594 for ( ; i; i = i->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 if (i->ifindex == dev->ifindex)
1596 packet_dev_mc(dev, i, what);
1597 }
1598}
1599
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001600static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601{
1602 struct packet_sock *po = pkt_sk(sk);
1603 struct packet_mclist *ml, *i;
1604 struct net_device *dev;
1605 int err;
1606
1607 rtnl_lock();
1608
1609 err = -ENODEV;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001610 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 if (!dev)
1612 goto done;
1613
1614 err = -EINVAL;
1615 if (mreq->mr_alen > dev->addr_len)
1616 goto done;
1617
1618 err = -ENOBUFS;
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08001619 i = kmalloc(sizeof(*i), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 if (i == NULL)
1621 goto done;
1622
1623 err = 0;
1624 for (ml = po->mclist; ml; ml = ml->next) {
1625 if (ml->ifindex == mreq->mr_ifindex &&
1626 ml->type == mreq->mr_type &&
1627 ml->alen == mreq->mr_alen &&
1628 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1629 ml->count++;
1630 /* Free the new element ... */
1631 kfree(i);
1632 goto done;
1633 }
1634 }
1635
1636 i->type = mreq->mr_type;
1637 i->ifindex = mreq->mr_ifindex;
1638 i->alen = mreq->mr_alen;
1639 memcpy(i->addr, mreq->mr_address, i->alen);
1640 i->count = 1;
1641 i->next = po->mclist;
1642 po->mclist = i;
Wang Chen2aeb0b82008-07-14 20:49:46 -07001643 err = packet_dev_mc(dev, i, 1);
1644 if (err) {
1645 po->mclist = i->next;
1646 kfree(i);
1647 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648
1649done:
1650 rtnl_unlock();
1651 return err;
1652}
1653
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001654static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655{
1656 struct packet_mclist *ml, **mlp;
1657
1658 rtnl_lock();
1659
1660 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1661 if (ml->ifindex == mreq->mr_ifindex &&
1662 ml->type == mreq->mr_type &&
1663 ml->alen == mreq->mr_alen &&
1664 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1665 if (--ml->count == 0) {
1666 struct net_device *dev;
1667 *mlp = ml->next;
Eric Dumazetad959e72009-10-16 06:38:46 +00001668 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1669 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 packet_dev_mc(dev, ml, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 kfree(ml);
1672 }
1673 rtnl_unlock();
1674 return 0;
1675 }
1676 }
1677 rtnl_unlock();
1678 return -EADDRNOTAVAIL;
1679}
1680
1681static void packet_flush_mclist(struct sock *sk)
1682{
1683 struct packet_sock *po = pkt_sk(sk);
1684 struct packet_mclist *ml;
1685
1686 if (!po->mclist)
1687 return;
1688
1689 rtnl_lock();
1690 while ((ml = po->mclist) != NULL) {
1691 struct net_device *dev;
1692
1693 po->mclist = ml->next;
Eric Dumazetad959e72009-10-16 06:38:46 +00001694 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1695 if (dev != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 packet_dev_mc(dev, ml, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 kfree(ml);
1698 }
1699 rtnl_unlock();
1700}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701
1702static int
David S. Millerb7058842009-09-30 16:12:20 -07001703packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704{
1705 struct sock *sk = sock->sk;
Herbert Xu8dc41942007-02-04 23:31:32 -08001706 struct packet_sock *po = pkt_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707 int ret;
1708
1709 if (level != SOL_PACKET)
1710 return -ENOPROTOOPT;
1711
Johann Baudy69e3c752009-05-18 22:11:22 -07001712 switch (optname) {
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001713 case PACKET_ADD_MEMBERSHIP:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 case PACKET_DROP_MEMBERSHIP:
1715 {
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001716 struct packet_mreq_max mreq;
1717 int len = optlen;
1718 memset(&mreq, 0, sizeof(mreq));
1719 if (len < sizeof(struct packet_mreq))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 return -EINVAL;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001721 if (len > sizeof(mreq))
1722 len = sizeof(mreq);
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001723 if (copy_from_user(&mreq, optval, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724 return -EFAULT;
Eric W. Biederman0fb375f2005-09-21 00:11:37 -07001725 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1726 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 if (optname == PACKET_ADD_MEMBERSHIP)
1728 ret = packet_mc_add(sk, &mreq);
1729 else
1730 ret = packet_mc_drop(sk, &mreq);
1731 return ret;
1732 }
David S. Millera2efcfa2007-05-29 13:12:50 -07001733
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734#ifdef CONFIG_PACKET_MMAP
1735 case PACKET_RX_RING:
Johann Baudy69e3c752009-05-18 22:11:22 -07001736 case PACKET_TX_RING:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 {
1738 struct tpacket_req req;
1739
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001740 if (optlen < sizeof(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 return -EINVAL;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001742 if (copy_from_user(&req, optval, sizeof(req)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743 return -EFAULT;
Johann Baudy69e3c752009-05-18 22:11:22 -07001744 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 }
1746 case PACKET_COPY_THRESH:
1747 {
1748 int val;
1749
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001750 if (optlen != sizeof(val))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 return -EINVAL;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001752 if (copy_from_user(&val, optval, sizeof(val)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 return -EFAULT;
1754
1755 pkt_sk(sk)->copy_thresh = val;
1756 return 0;
1757 }
Patrick McHardybbd6ef82008-07-14 22:50:15 -07001758 case PACKET_VERSION:
1759 {
1760 int val;
1761
1762 if (optlen != sizeof(val))
1763 return -EINVAL;
Johann Baudy69e3c752009-05-18 22:11:22 -07001764 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
Patrick McHardybbd6ef82008-07-14 22:50:15 -07001765 return -EBUSY;
1766 if (copy_from_user(&val, optval, sizeof(val)))
1767 return -EFAULT;
1768 switch (val) {
1769 case TPACKET_V1:
1770 case TPACKET_V2:
1771 po->tp_version = val;
1772 return 0;
1773 default:
1774 return -EINVAL;
1775 }
1776 }
Patrick McHardy89133362008-07-18 18:05:19 -07001777 case PACKET_RESERVE:
1778 {
1779 unsigned int val;
1780
1781 if (optlen != sizeof(val))
1782 return -EINVAL;
Johann Baudy69e3c752009-05-18 22:11:22 -07001783 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
Patrick McHardy89133362008-07-18 18:05:19 -07001784 return -EBUSY;
1785 if (copy_from_user(&val, optval, sizeof(val)))
1786 return -EFAULT;
1787 po->tp_reserve = val;
1788 return 0;
1789 }
Johann Baudy69e3c752009-05-18 22:11:22 -07001790 case PACKET_LOSS:
1791 {
1792 unsigned int val;
1793
1794 if (optlen != sizeof(val))
1795 return -EINVAL;
1796 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
1797 return -EBUSY;
1798 if (copy_from_user(&val, optval, sizeof(val)))
1799 return -EFAULT;
1800 po->tp_loss = !!val;
1801 return 0;
1802 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803#endif
Herbert Xu8dc41942007-02-04 23:31:32 -08001804 case PACKET_AUXDATA:
1805 {
1806 int val;
1807
1808 if (optlen < sizeof(val))
1809 return -EINVAL;
1810 if (copy_from_user(&val, optval, sizeof(val)))
1811 return -EFAULT;
1812
1813 po->auxdata = !!val;
1814 return 0;
1815 }
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -07001816 case PACKET_ORIGDEV:
1817 {
1818 int val;
1819
1820 if (optlen < sizeof(val))
1821 return -EINVAL;
1822 if (copy_from_user(&val, optval, sizeof(val)))
1823 return -EFAULT;
1824
1825 po->origdev = !!val;
1826 return 0;
1827 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 default:
1829 return -ENOPROTOOPT;
1830 }
1831}
1832
1833static int packet_getsockopt(struct socket *sock, int level, int optname,
1834 char __user *optval, int __user *optlen)
1835{
1836 int len;
Herbert Xu8dc41942007-02-04 23:31:32 -08001837 int val;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 struct sock *sk = sock->sk;
1839 struct packet_sock *po = pkt_sk(sk);
Herbert Xu8dc41942007-02-04 23:31:32 -08001840 void *data;
1841 struct tpacket_stats st;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842
1843 if (level != SOL_PACKET)
1844 return -ENOPROTOOPT;
1845
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001846 if (get_user(len, optlen))
1847 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848
1849 if (len < 0)
1850 return -EINVAL;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09001851
Johann Baudy69e3c752009-05-18 22:11:22 -07001852 switch (optname) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 case PACKET_STATISTICS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 if (len > sizeof(struct tpacket_stats))
1855 len = sizeof(struct tpacket_stats);
1856 spin_lock_bh(&sk->sk_receive_queue.lock);
1857 st = po->stats;
1858 memset(&po->stats, 0, sizeof(st));
1859 spin_unlock_bh(&sk->sk_receive_queue.lock);
1860 st.tp_packets += st.tp_drops;
1861
Herbert Xu8dc41942007-02-04 23:31:32 -08001862 data = &st;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 break;
Herbert Xu8dc41942007-02-04 23:31:32 -08001864 case PACKET_AUXDATA:
1865 if (len > sizeof(int))
1866 len = sizeof(int);
1867 val = po->auxdata;
1868
1869 data = &val;
1870 break;
Peter P. Waskiewicz Jr80feaac2007-04-20 16:05:39 -07001871 case PACKET_ORIGDEV:
1872 if (len > sizeof(int))
1873 len = sizeof(int);
1874 val = po->origdev;
1875
1876 data = &val;
1877 break;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07001878#ifdef CONFIG_PACKET_MMAP
1879 case PACKET_VERSION:
1880 if (len > sizeof(int))
1881 len = sizeof(int);
1882 val = po->tp_version;
1883 data = &val;
1884 break;
1885 case PACKET_HDRLEN:
1886 if (len > sizeof(int))
1887 len = sizeof(int);
1888 if (copy_from_user(&val, optval, len))
1889 return -EFAULT;
1890 switch (val) {
1891 case TPACKET_V1:
1892 val = sizeof(struct tpacket_hdr);
1893 break;
1894 case TPACKET_V2:
1895 val = sizeof(struct tpacket2_hdr);
1896 break;
1897 default:
1898 return -EINVAL;
1899 }
1900 data = &val;
1901 break;
Patrick McHardy89133362008-07-18 18:05:19 -07001902 case PACKET_RESERVE:
1903 if (len > sizeof(unsigned int))
1904 len = sizeof(unsigned int);
1905 val = po->tp_reserve;
1906 data = &val;
1907 break;
Johann Baudy69e3c752009-05-18 22:11:22 -07001908 case PACKET_LOSS:
1909 if (len > sizeof(unsigned int))
1910 len = sizeof(unsigned int);
1911 val = po->tp_loss;
1912 data = &val;
1913 break;
Patrick McHardybbd6ef82008-07-14 22:50:15 -07001914#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 default:
1916 return -ENOPROTOOPT;
1917 }
1918
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001919 if (put_user(len, optlen))
1920 return -EFAULT;
Herbert Xu8dc41942007-02-04 23:31:32 -08001921 if (copy_to_user(optval, data, len))
1922 return -EFAULT;
Kris Katterjohn8ae55f02006-01-23 16:28:02 -08001923 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924}
1925
1926
1927static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
1928{
1929 struct sock *sk;
1930 struct hlist_node *node;
Jason Lunzad930652007-02-20 23:19:54 -08001931 struct net_device *dev = data;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001932 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08001934 read_lock(&net->packet.sklist_lock);
1935 sk_for_each(sk, node, &net->packet.sklist) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 struct packet_sock *po = pkt_sk(sk);
1937
1938 switch (msg) {
1939 case NETDEV_UNREGISTER:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 if (po->mclist)
1941 packet_dev_mclist(dev, po->mclist, -1);
David S. Millera2efcfa2007-05-29 13:12:50 -07001942 /* fallthrough */
1943
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 case NETDEV_DOWN:
1945 if (dev->ifindex == po->ifindex) {
1946 spin_lock(&po->bind_lock);
1947 if (po->running) {
1948 __dev_remove_pack(&po->prot_hook);
1949 __sock_put(sk);
1950 po->running = 0;
1951 sk->sk_err = ENETDOWN;
1952 if (!sock_flag(sk, SOCK_DEAD))
1953 sk->sk_error_report(sk);
1954 }
1955 if (msg == NETDEV_UNREGISTER) {
1956 po->ifindex = -1;
1957 po->prot_hook.dev = NULL;
1958 }
1959 spin_unlock(&po->bind_lock);
1960 }
1961 break;
1962 case NETDEV_UP:
1963 spin_lock(&po->bind_lock);
1964 if (dev->ifindex == po->ifindex && po->num &&
1965 !po->running) {
1966 dev_add_pack(&po->prot_hook);
1967 sock_hold(sk);
1968 po->running = 1;
1969 }
1970 spin_unlock(&po->bind_lock);
1971 break;
1972 }
1973 }
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08001974 read_unlock(&net->packet.sklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 return NOTIFY_DONE;
1976}
1977
1978
1979static int packet_ioctl(struct socket *sock, unsigned int cmd,
1980 unsigned long arg)
1981{
1982 struct sock *sk = sock->sk;
1983
Johann Baudy69e3c752009-05-18 22:11:22 -07001984 switch (cmd) {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001985 case SIOCOUTQ:
1986 {
1987 int amount = sk_wmem_alloc_get(sk);
Eric Dumazet31e6d362009-06-17 19:05:41 -07001988
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001989 return put_user(amount, (int __user *)arg);
1990 }
1991 case SIOCINQ:
1992 {
1993 struct sk_buff *skb;
1994 int amount = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00001996 spin_lock_bh(&sk->sk_receive_queue.lock);
1997 skb = skb_peek(&sk->sk_receive_queue);
1998 if (skb)
1999 amount = skb->len;
2000 spin_unlock_bh(&sk->sk_receive_queue.lock);
2001 return put_user(amount, (int __user *)arg);
2002 }
2003 case SIOCGSTAMP:
2004 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2005 case SIOCGSTAMPNS:
2006 return sock_get_timestampns(sk, (struct timespec __user *)arg);
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002007
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008#ifdef CONFIG_INET
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002009 case SIOCADDRT:
2010 case SIOCDELRT:
2011 case SIOCDARP:
2012 case SIOCGARP:
2013 case SIOCSARP:
2014 case SIOCGIFADDR:
2015 case SIOCSIFADDR:
2016 case SIOCGIFBRDADDR:
2017 case SIOCSIFBRDADDR:
2018 case SIOCGIFNETMASK:
2019 case SIOCSIFNETMASK:
2020 case SIOCGIFDSTADDR:
2021 case SIOCSIFDSTADDR:
2022 case SIOCSIFFLAGS:
2023 if (!net_eq(sock_net(sk), &init_net))
2024 return -ENOIOCTLCMD;
2025 return inet_dgram_ops.ioctl(sock, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026#endif
2027
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002028 default:
2029 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 }
2031 return 0;
2032}
2033
2034#ifndef CONFIG_PACKET_MMAP
2035#define packet_mmap sock_no_mmap
2036#define packet_poll datagram_poll
2037#else
2038
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002039static unsigned int packet_poll(struct file *file, struct socket *sock,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040 poll_table *wait)
2041{
2042 struct sock *sk = sock->sk;
2043 struct packet_sock *po = pkt_sk(sk);
2044 unsigned int mask = datagram_poll(file, sock, wait);
2045
2046 spin_lock_bh(&sk->sk_receive_queue.lock);
Johann Baudy69e3c752009-05-18 22:11:22 -07002047 if (po->rx_ring.pg_vec) {
2048 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049 mask |= POLLIN | POLLRDNORM;
2050 }
2051 spin_unlock_bh(&sk->sk_receive_queue.lock);
Johann Baudy69e3c752009-05-18 22:11:22 -07002052 spin_lock_bh(&sk->sk_write_queue.lock);
2053 if (po->tx_ring.pg_vec) {
2054 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2055 mask |= POLLOUT | POLLWRNORM;
2056 }
2057 spin_unlock_bh(&sk->sk_write_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058 return mask;
2059}
2060
2061
2062/* Dirty? Well, I still did not learn better way to account
2063 * for user mmaps.
2064 */
2065
2066static void packet_mm_open(struct vm_area_struct *vma)
2067{
2068 struct file *file = vma->vm_file;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002069 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 struct sock *sk = sock->sk;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002071
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072 if (sk)
2073 atomic_inc(&pkt_sk(sk)->mapped);
2074}
2075
2076static void packet_mm_close(struct vm_area_struct *vma)
2077{
2078 struct file *file = vma->vm_file;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002079 struct socket *sock = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080 struct sock *sk = sock->sk;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002081
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082 if (sk)
2083 atomic_dec(&pkt_sk(sk)->mapped);
2084}
2085
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +04002086static const struct vm_operations_struct packet_mmap_ops = {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002087 .open = packet_mm_open,
2088 .close = packet_mm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089};
2090
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002091static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092{
2093 int i;
2094
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002095 for (i = 0; i < len; i++) {
2096 if (likely(pg_vec[i]))
2097 free_pages((unsigned long) pg_vec[i], order);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 }
2099 kfree(pg_vec);
2100}
2101
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002102static inline char *alloc_one_pg_vec_page(unsigned long order)
2103{
Eric Dumazet719bfea2009-04-15 03:39:52 -07002104 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;
2105
2106 return (char *) __get_free_pages(gfp_flags, order);
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002107}
2108
2109static char **alloc_pg_vec(struct tpacket_req *req, int order)
2110{
2111 unsigned int block_nr = req->tp_block_nr;
2112 char **pg_vec;
2113 int i;
2114
2115 pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
2116 if (unlikely(!pg_vec))
2117 goto out;
2118
2119 for (i = 0; i < block_nr; i++) {
2120 pg_vec[i] = alloc_one_pg_vec_page(order);
2121 if (unlikely(!pg_vec[i]))
2122 goto out_free_pgvec;
2123 }
2124
2125out:
2126 return pg_vec;
2127
2128out_free_pgvec:
2129 free_pg_vec(pg_vec, order, block_nr);
2130 pg_vec = NULL;
2131 goto out;
2132}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133
Johann Baudy69e3c752009-05-18 22:11:22 -07002134static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2135 int closing, int tx_ring)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136{
2137 char **pg_vec = NULL;
2138 struct packet_sock *po = pkt_sk(sk);
Al Viro0e11c912006-11-08 00:26:29 -08002139 int was_running, order = 0;
Johann Baudy69e3c752009-05-18 22:11:22 -07002140 struct packet_ring_buffer *rb;
2141 struct sk_buff_head *rb_queue;
Al Viro0e11c912006-11-08 00:26:29 -08002142 __be16 num;
Johann Baudy69e3c752009-05-18 22:11:22 -07002143 int err;
2144
2145 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2146 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2147
2148 err = -EBUSY;
2149 if (!closing) {
2150 if (atomic_read(&po->mapped))
2151 goto out;
2152 if (atomic_read(&rb->pending))
2153 goto out;
2154 }
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002155
Linus Torvalds1da177e2005-04-16 15:20:36 -07002156 if (req->tp_block_nr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157 /* Sanity tests and some calculations */
Johann Baudy69e3c752009-05-18 22:11:22 -07002158 err = -EBUSY;
2159 if (unlikely(rb->pg_vec))
2160 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161
Patrick McHardybbd6ef82008-07-14 22:50:15 -07002162 switch (po->tp_version) {
2163 case TPACKET_V1:
2164 po->tp_hdrlen = TPACKET_HDRLEN;
2165 break;
2166 case TPACKET_V2:
2167 po->tp_hdrlen = TPACKET2_HDRLEN;
2168 break;
2169 }
2170
Johann Baudy69e3c752009-05-18 22:11:22 -07002171 err = -EINVAL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002172 if (unlikely((int)req->tp_block_size <= 0))
Johann Baudy69e3c752009-05-18 22:11:22 -07002173 goto out;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002174 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
Johann Baudy69e3c752009-05-18 22:11:22 -07002175 goto out;
Patrick McHardy89133362008-07-18 18:05:19 -07002176 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
Johann Baudy69e3c752009-05-18 22:11:22 -07002177 po->tp_reserve))
2178 goto out;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002179 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
Johann Baudy69e3c752009-05-18 22:11:22 -07002180 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181
Johann Baudy69e3c752009-05-18 22:11:22 -07002182 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2183 if (unlikely(rb->frames_per_block <= 0))
2184 goto out;
2185 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2186 req->tp_frame_nr))
2187 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188
2189 err = -ENOMEM;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002190 order = get_order(req->tp_block_size);
2191 pg_vec = alloc_pg_vec(req, order);
2192 if (unlikely(!pg_vec))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193 goto out;
Johann Baudy69e3c752009-05-18 22:11:22 -07002194 }
2195 /* Done */
2196 else {
2197 err = -EINVAL;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002198 if (unlikely(req->tp_frame_nr))
Johann Baudy69e3c752009-05-18 22:11:22 -07002199 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200 }
2201
2202 lock_sock(sk);
2203
2204 /* Detach socket from network */
2205 spin_lock(&po->bind_lock);
2206 was_running = po->running;
2207 num = po->num;
2208 if (was_running) {
2209 __dev_remove_pack(&po->prot_hook);
2210 po->num = 0;
2211 po->running = 0;
2212 __sock_put(sk);
2213 }
2214 spin_unlock(&po->bind_lock);
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002215
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216 synchronize_net();
2217
2218 err = -EBUSY;
Herbert Xu905db442009-01-30 14:12:06 -08002219 mutex_lock(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002220 if (closing || atomic_read(&po->mapped) == 0) {
2221 err = 0;
2222#define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
Johann Baudy69e3c752009-05-18 22:11:22 -07002223 spin_lock_bh(&rb_queue->lock);
2224 pg_vec = XC(rb->pg_vec, pg_vec);
2225 rb->frame_max = (req->tp_frame_nr - 1);
2226 rb->head = 0;
2227 rb->frame_size = req->tp_frame_size;
2228 spin_unlock_bh(&rb_queue->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229
Johann Baudy69e3c752009-05-18 22:11:22 -07002230 order = XC(rb->pg_vec_order, order);
2231 req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232
Johann Baudy69e3c752009-05-18 22:11:22 -07002233 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2234 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2235 tpacket_rcv : packet_rcv;
2236 skb_queue_purge(rb_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237#undef XC
2238 if (atomic_read(&po->mapped))
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002239 pr_err("packet_mmap: vma is busy: %d\n",
2240 atomic_read(&po->mapped));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002241 }
Herbert Xu905db442009-01-30 14:12:06 -08002242 mutex_unlock(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002243
2244 spin_lock(&po->bind_lock);
2245 if (was_running && !po->running) {
2246 sock_hold(sk);
2247 po->running = 1;
2248 po->num = num;
2249 dev_add_pack(&po->prot_hook);
2250 }
2251 spin_unlock(&po->bind_lock);
2252
2253 release_sock(sk);
2254
Linus Torvalds1da177e2005-04-16 15:20:36 -07002255 if (pg_vec)
2256 free_pg_vec(pg_vec, order, req->tp_block_nr);
2257out:
2258 return err;
2259}
2260
Johann Baudy69e3c752009-05-18 22:11:22 -07002261static int packet_mmap(struct file *file, struct socket *sock,
2262 struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002263{
2264 struct sock *sk = sock->sk;
2265 struct packet_sock *po = pkt_sk(sk);
Johann Baudy69e3c752009-05-18 22:11:22 -07002266 unsigned long size, expected_size;
2267 struct packet_ring_buffer *rb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002268 unsigned long start;
2269 int err = -EINVAL;
2270 int i;
2271
2272 if (vma->vm_pgoff)
2273 return -EINVAL;
2274
Herbert Xu905db442009-01-30 14:12:06 -08002275 mutex_lock(&po->pg_vec_lock);
Johann Baudy69e3c752009-05-18 22:11:22 -07002276
2277 expected_size = 0;
2278 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2279 if (rb->pg_vec) {
2280 expected_size += rb->pg_vec_len
2281 * rb->pg_vec_pages
2282 * PAGE_SIZE;
2283 }
2284 }
2285
2286 if (expected_size == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002287 goto out;
Johann Baudy69e3c752009-05-18 22:11:22 -07002288
2289 size = vma->vm_end - vma->vm_start;
2290 if (size != expected_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291 goto out;
2292
Linus Torvalds1da177e2005-04-16 15:20:36 -07002293 start = vma->vm_start;
Johann Baudy69e3c752009-05-18 22:11:22 -07002294 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2295 if (rb->pg_vec == NULL)
2296 continue;
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002297
Johann Baudy69e3c752009-05-18 22:11:22 -07002298 for (i = 0; i < rb->pg_vec_len; i++) {
2299 struct page *page = virt_to_page(rb->pg_vec[i]);
2300 int pg_num;
2301
2302 for (pg_num = 0; pg_num < rb->pg_vec_pages;
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002303 pg_num++, page++) {
Johann Baudy69e3c752009-05-18 22:11:22 -07002304 err = vm_insert_page(vma, start, page);
2305 if (unlikely(err))
2306 goto out;
2307 start += PAGE_SIZE;
2308 }
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002309 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002310 }
Johann Baudy69e3c752009-05-18 22:11:22 -07002311
David S. Miller4ebf0ae2005-12-06 16:38:35 -08002312 atomic_inc(&po->mapped);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313 vma->vm_ops = &packet_mmap_ops;
2314 err = 0;
2315
2316out:
Herbert Xu905db442009-01-30 14:12:06 -08002317 mutex_unlock(&po->pg_vec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318 return err;
2319}
2320#endif
2321
2322
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08002323static const struct proto_ops packet_ops_spkt = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002324 .family = PF_PACKET,
2325 .owner = THIS_MODULE,
2326 .release = packet_release,
2327 .bind = packet_bind_spkt,
2328 .connect = sock_no_connect,
2329 .socketpair = sock_no_socketpair,
2330 .accept = sock_no_accept,
2331 .getname = packet_getname_spkt,
2332 .poll = datagram_poll,
2333 .ioctl = packet_ioctl,
2334 .listen = sock_no_listen,
2335 .shutdown = sock_no_shutdown,
2336 .setsockopt = sock_no_setsockopt,
2337 .getsockopt = sock_no_getsockopt,
2338 .sendmsg = packet_sendmsg_spkt,
2339 .recvmsg = packet_recvmsg,
2340 .mmap = sock_no_mmap,
2341 .sendpage = sock_no_sendpage,
2342};
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08002344static const struct proto_ops packet_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002345 .family = PF_PACKET,
2346 .owner = THIS_MODULE,
2347 .release = packet_release,
2348 .bind = packet_bind,
2349 .connect = sock_no_connect,
2350 .socketpair = sock_no_socketpair,
2351 .accept = sock_no_accept,
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002352 .getname = packet_getname,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002353 .poll = packet_poll,
2354 .ioctl = packet_ioctl,
2355 .listen = sock_no_listen,
2356 .shutdown = sock_no_shutdown,
2357 .setsockopt = packet_setsockopt,
2358 .getsockopt = packet_getsockopt,
2359 .sendmsg = packet_sendmsg,
2360 .recvmsg = packet_recvmsg,
2361 .mmap = packet_mmap,
2362 .sendpage = sock_no_sendpage,
2363};
2364
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00002365static const struct net_proto_family packet_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002366 .family = PF_PACKET,
2367 .create = packet_create,
2368 .owner = THIS_MODULE,
2369};
2370
2371static struct notifier_block packet_netdev_notifier = {
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002372 .notifier_call = packet_notifier,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373};
2374
2375#ifdef CONFIG_PROC_FS
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002376static inline struct sock *packet_seq_idx(struct net *net, loff_t off)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002377{
2378 struct sock *s;
2379 struct hlist_node *node;
2380
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08002381 sk_for_each(s, node, &net->packet.sklist) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382 if (!off--)
2383 return s;
2384 }
2385 return NULL;
2386}
2387
2388static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazet40ccbf52008-01-07 22:39:57 -08002389 __acquires(seq_file_net(seq)->packet.sklist_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390{
Denis V. Luneve372c412007-11-19 22:31:54 -08002391 struct net *net = seq_file_net(seq);
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08002392 read_lock(&net->packet.sklist_lock);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002393 return *pos ? packet_seq_idx(net, *pos - 1) : SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002394}
2395
2396static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2397{
Herbert Xu1bf40952007-12-16 14:04:02 -08002398 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002399 ++*pos;
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002400 return (v == SEQ_START_TOKEN)
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08002401 ? sk_head(&net->packet.sklist)
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002402 : sk_next((struct sock *)v) ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403}
2404
2405static void packet_seq_stop(struct seq_file *seq, void *v)
Eric Dumazet40ccbf52008-01-07 22:39:57 -08002406 __releases(seq_file_net(seq)->packet.sklist_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002407{
Herbert Xu1bf40952007-12-16 14:04:02 -08002408 struct net *net = seq_file_net(seq);
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08002409 read_unlock(&net->packet.sklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002410}
2411
YOSHIFUJI Hideaki1ce4f282007-02-09 23:25:10 +09002412static int packet_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413{
2414 if (v == SEQ_START_TOKEN)
2415 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
2416 else {
2417 struct sock *s = v;
2418 const struct packet_sock *po = pkt_sk(s);
2419
2420 seq_printf(seq,
2421 "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
2422 s,
2423 atomic_read(&s->sk_refcnt),
2424 s->sk_type,
2425 ntohs(po->num),
2426 po->ifindex,
2427 po->running,
2428 atomic_read(&s->sk_rmem_alloc),
2429 sock_i_uid(s),
Eric Dumazet40d4e3d2009-07-21 21:57:59 +00002430 sock_i_ino(s));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431 }
2432
2433 return 0;
2434}
2435
Philippe De Muyter56b3d972007-07-10 23:07:31 -07002436static const struct seq_operations packet_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002437 .start = packet_seq_start,
2438 .next = packet_seq_next,
2439 .stop = packet_seq_stop,
2440 .show = packet_seq_show,
2441};
2442
2443static int packet_seq_open(struct inode *inode, struct file *file)
2444{
Denis V. Luneve372c412007-11-19 22:31:54 -08002445 return seq_open_net(inode, file, &packet_seq_ops,
2446 sizeof(struct seq_net_private));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002447}
2448
Arjan van de Venda7071d2007-02-12 00:55:36 -08002449static const struct file_operations packet_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002450 .owner = THIS_MODULE,
2451 .open = packet_seq_open,
2452 .read = seq_read,
2453 .llseek = seq_lseek,
Denis V. Luneve372c412007-11-19 22:31:54 -08002454 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002455};
2456
2457#endif
2458
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002459static int packet_net_init(struct net *net)
2460{
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -08002461 rwlock_init(&net->packet.sklist_lock);
2462 INIT_HLIST_HEAD(&net->packet.sklist);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002463
2464 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2465 return -ENOMEM;
2466
2467 return 0;
2468}
2469
2470static void packet_net_exit(struct net *net)
2471{
2472 proc_net_remove(net, "packet");
2473}
2474
2475static struct pernet_operations packet_net_ops = {
2476 .init = packet_net_init,
2477 .exit = packet_net_exit,
2478};
2479
2480
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481static void __exit packet_exit(void)
2482{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483 unregister_netdevice_notifier(&packet_netdev_notifier);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002484 unregister_pernet_subsys(&packet_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002485 sock_unregister(PF_PACKET);
2486 proto_unregister(&packet_proto);
2487}
2488
2489static int __init packet_init(void)
2490{
2491 int rc = proto_register(&packet_proto, 0);
2492
2493 if (rc != 0)
2494 goto out;
2495
2496 sock_register(&packet_family_ops);
Denis V. Lunevd12d01d2007-11-19 22:28:35 -08002497 register_pernet_subsys(&packet_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498 register_netdevice_notifier(&packet_netdev_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499out:
2500 return rc;
2501}
2502
2503module_init(packet_init);
2504module_exit(packet_exit);
2505MODULE_LICENSE("GPL");
2506MODULE_ALIAS_NETPROTO(PF_PACKET);