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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PACKET - implements raw packet sockets. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * | |
1ce4f28b | 12 | * Fixes: |
1da177e4 LT |
13 | * Alan Cox : verify_area() now used correctly |
14 | * Alan Cox : new skbuff lists, look ma no backlogs! | |
15 | * Alan Cox : tidied skbuff lists. | |
16 | * Alan Cox : Now uses generic datagram routines I | |
17 | * added. Also fixed the peek/read crash | |
18 | * from all old Linux datagram code. | |
19 | * Alan Cox : Uses the improved datagram code. | |
20 | * Alan Cox : Added NULL's for socket options. | |
21 | * Alan Cox : Re-commented the code. | |
22 | * Alan Cox : Use new kernel side addressing | |
23 | * Rob Janssen : Correct MTU usage. | |
24 | * Dave Platt : Counter leaks caused by incorrect | |
25 | * interrupt locking and some slightly | |
26 | * dubious gcc output. Can you read | |
27 | * compiler: it said _VOLATILE_ | |
28 | * Richard Kooijman : Timestamp fixes. | |
29 | * Alan Cox : New buffers. Use sk->mac.raw. | |
30 | * Alan Cox : sendmsg/recvmsg support. | |
31 | * Alan Cox : Protocol setting support | |
32 | * Alexey Kuznetsov : Untied from IPv4 stack. | |
33 | * Cyrus Durgin : Fixed kerneld for kmod. | |
34 | * Michal Ostrowski : Module initialization cleanup. | |
1ce4f28b | 35 | * Ulises Alonso : Frame number limit removal and |
1da177e4 | 36 | * packet_set_ring memory leak. |
0fb375fb EB |
37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
38 | * The convention is that longer addresses | |
39 | * will simply extend the hardware address | |
1ce4f28b | 40 | * byte arrays at the end of sockaddr_ll |
0fb375fb | 41 | * and packet_mreq. |
69e3c75f | 42 | * Johann Baudy : Added TX RING. |
1da177e4 LT |
43 | * |
44 | * This program is free software; you can redistribute it and/or | |
45 | * modify it under the terms of the GNU General Public License | |
46 | * as published by the Free Software Foundation; either version | |
47 | * 2 of the License, or (at your option) any later version. | |
48 | * | |
49 | */ | |
1ce4f28b | 50 | |
1da177e4 | 51 | #include <linux/types.h> |
1da177e4 | 52 | #include <linux/mm.h> |
4fc268d2 | 53 | #include <linux/capability.h> |
1da177e4 LT |
54 | #include <linux/fcntl.h> |
55 | #include <linux/socket.h> | |
56 | #include <linux/in.h> | |
57 | #include <linux/inet.h> | |
58 | #include <linux/netdevice.h> | |
59 | #include <linux/if_packet.h> | |
60 | #include <linux/wireless.h> | |
ffbc6111 | 61 | #include <linux/kernel.h> |
1da177e4 | 62 | #include <linux/kmod.h> |
5a0e3ad6 | 63 | #include <linux/slab.h> |
457c4cbc | 64 | #include <net/net_namespace.h> |
1da177e4 LT |
65 | #include <net/ip.h> |
66 | #include <net/protocol.h> | |
67 | #include <linux/skbuff.h> | |
68 | #include <net/sock.h> | |
69 | #include <linux/errno.h> | |
70 | #include <linux/timer.h> | |
71 | #include <asm/system.h> | |
72 | #include <asm/uaccess.h> | |
73 | #include <asm/ioctls.h> | |
74 | #include <asm/page.h> | |
a1f8e7f7 | 75 | #include <asm/cacheflush.h> |
1da177e4 LT |
76 | #include <asm/io.h> |
77 | #include <linux/proc_fs.h> | |
78 | #include <linux/seq_file.h> | |
79 | #include <linux/poll.h> | |
80 | #include <linux/module.h> | |
81 | #include <linux/init.h> | |
905db440 | 82 | #include <linux/mutex.h> |
05423b24 | 83 | #include <linux/if_vlan.h> |
bfd5f4a3 | 84 | #include <linux/virtio_net.h> |
ed85b565 | 85 | #include <linux/errqueue.h> |
1da177e4 LT |
86 | |
87 | #ifdef CONFIG_INET | |
88 | #include <net/inet_common.h> | |
89 | #endif | |
90 | ||
1da177e4 LT |
91 | /* |
92 | Assumptions: | |
93 | - if device has no dev->hard_header routine, it adds and removes ll header | |
94 | inside itself. In this case ll header is invisible outside of device, | |
95 | but higher levels still should reserve dev->hard_header_len. | |
96 | Some devices are enough clever to reallocate skb, when header | |
97 | will not fit to reserved space (tunnel), another ones are silly | |
98 | (PPP). | |
99 | - packet socket receives packets with pulled ll header, | |
100 | so that SOCK_RAW should push it back. | |
101 | ||
102 | On receive: | |
103 | ----------- | |
104 | ||
105 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
106 | mac_header -> ll header |
107 | data -> data | |
1da177e4 LT |
108 | |
109 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
110 | mac_header -> ll header |
111 | data -> ll header | |
1da177e4 LT |
112 | |
113 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
114 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
115 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 116 | assymetry between rx and tx paths. |
b0e380b1 | 117 | data -> data |
1da177e4 LT |
118 | |
119 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
120 | mac_header -> data. ll header is still not built! |
121 | data -> data | |
1da177e4 LT |
122 | |
123 | Resume | |
124 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
125 | ||
126 | ||
127 | On transmit: | |
128 | ------------ | |
129 | ||
130 | dev->hard_header != NULL | |
b0e380b1 ACM |
131 | mac_header -> ll header |
132 | data -> ll header | |
1da177e4 LT |
133 | |
134 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
135 | mac_header -> data |
136 | data -> data | |
1da177e4 LT |
137 | |
138 | We should set nh.raw on output to correct posistion, | |
139 | packet classifier depends on it. | |
140 | */ | |
141 | ||
1da177e4 LT |
142 | /* Private packet socket structures. */ |
143 | ||
40d4e3df | 144 | struct packet_mclist { |
1da177e4 LT |
145 | struct packet_mclist *next; |
146 | int ifindex; | |
147 | int count; | |
148 | unsigned short type; | |
149 | unsigned short alen; | |
0fb375fb EB |
150 | unsigned char addr[MAX_ADDR_LEN]; |
151 | }; | |
152 | /* identical to struct packet_mreq except it has | |
153 | * a longer address field. | |
154 | */ | |
40d4e3df | 155 | struct packet_mreq_max { |
0fb375fb EB |
156 | int mr_ifindex; |
157 | unsigned short mr_type; | |
158 | unsigned short mr_alen; | |
159 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 160 | }; |
a2efcfa0 | 161 | |
69e3c75f JB |
162 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
163 | int closing, int tx_ring); | |
164 | ||
165 | struct packet_ring_buffer { | |
40d4e3df | 166 | char **pg_vec; |
69e3c75f JB |
167 | unsigned int head; |
168 | unsigned int frames_per_block; | |
169 | unsigned int frame_size; | |
170 | unsigned int frame_max; | |
171 | ||
172 | unsigned int pg_vec_order; | |
173 | unsigned int pg_vec_pages; | |
174 | unsigned int pg_vec_len; | |
175 | ||
176 | atomic_t pending; | |
177 | }; | |
178 | ||
179 | struct packet_sock; | |
180 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
1da177e4 LT |
181 | |
182 | static void packet_flush_mclist(struct sock *sk); | |
183 | ||
184 | struct packet_sock { | |
185 | /* struct sock has to be the first member of packet_sock */ | |
186 | struct sock sk; | |
187 | struct tpacket_stats stats; | |
69e3c75f JB |
188 | struct packet_ring_buffer rx_ring; |
189 | struct packet_ring_buffer tx_ring; | |
1da177e4 | 190 | int copy_thresh; |
1da177e4 | 191 | spinlock_t bind_lock; |
905db440 | 192 | struct mutex pg_vec_lock; |
8dc41944 | 193 | unsigned int running:1, /* prot_hook is attached*/ |
80feaacb | 194 | auxdata:1, |
bfd5f4a3 SS |
195 | origdev:1, |
196 | has_vnet_hdr:1; | |
1da177e4 | 197 | int ifindex; /* bound device */ |
0e11c91e | 198 | __be16 num; |
1da177e4 | 199 | struct packet_mclist *mclist; |
1da177e4 | 200 | atomic_t mapped; |
bbd6ef87 PM |
201 | enum tpacket_versions tp_version; |
202 | unsigned int tp_hdrlen; | |
8913336a | 203 | unsigned int tp_reserve; |
69e3c75f | 204 | unsigned int tp_loss:1; |
94b05952 | 205 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
1da177e4 LT |
206 | }; |
207 | ||
ffbc6111 HX |
208 | struct packet_skb_cb { |
209 | unsigned int origlen; | |
210 | union { | |
211 | struct sockaddr_pkt pkt; | |
212 | struct sockaddr_ll ll; | |
213 | } sa; | |
214 | }; | |
215 | ||
216 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 217 | |
69e3c75f | 218 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 219 | { |
bbd6ef87 PM |
220 | union { |
221 | struct tpacket_hdr *h1; | |
222 | struct tpacket2_hdr *h2; | |
223 | void *raw; | |
224 | } h; | |
1da177e4 | 225 | |
69e3c75f | 226 | h.raw = frame; |
bbd6ef87 PM |
227 | switch (po->tp_version) { |
228 | case TPACKET_V1: | |
69e3c75f JB |
229 | h.h1->tp_status = status; |
230 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); | |
bbd6ef87 PM |
231 | break; |
232 | case TPACKET_V2: | |
69e3c75f JB |
233 | h.h2->tp_status = status; |
234 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); | |
bbd6ef87 | 235 | break; |
69e3c75f | 236 | default: |
40d4e3df | 237 | pr_err("TPACKET version not supported\n"); |
69e3c75f | 238 | BUG(); |
bbd6ef87 | 239 | } |
69e3c75f JB |
240 | |
241 | smp_wmb(); | |
bbd6ef87 PM |
242 | } |
243 | ||
69e3c75f | 244 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 PM |
245 | { |
246 | union { | |
247 | struct tpacket_hdr *h1; | |
248 | struct tpacket2_hdr *h2; | |
249 | void *raw; | |
250 | } h; | |
251 | ||
69e3c75f JB |
252 | smp_rmb(); |
253 | ||
bbd6ef87 PM |
254 | h.raw = frame; |
255 | switch (po->tp_version) { | |
256 | case TPACKET_V1: | |
69e3c75f JB |
257 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); |
258 | return h.h1->tp_status; | |
bbd6ef87 | 259 | case TPACKET_V2: |
69e3c75f JB |
260 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); |
261 | return h.h2->tp_status; | |
262 | default: | |
40d4e3df | 263 | pr_err("TPACKET version not supported\n"); |
69e3c75f JB |
264 | BUG(); |
265 | return 0; | |
bbd6ef87 | 266 | } |
1da177e4 | 267 | } |
69e3c75f JB |
268 | |
269 | static void *packet_lookup_frame(struct packet_sock *po, | |
270 | struct packet_ring_buffer *rb, | |
271 | unsigned int position, | |
272 | int status) | |
273 | { | |
274 | unsigned int pg_vec_pos, frame_offset; | |
275 | union { | |
276 | struct tpacket_hdr *h1; | |
277 | struct tpacket2_hdr *h2; | |
278 | void *raw; | |
279 | } h; | |
280 | ||
281 | pg_vec_pos = position / rb->frames_per_block; | |
282 | frame_offset = position % rb->frames_per_block; | |
283 | ||
284 | h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size); | |
285 | ||
286 | if (status != __packet_get_status(po, h.raw)) | |
287 | return NULL; | |
288 | ||
289 | return h.raw; | |
290 | } | |
291 | ||
292 | static inline void *packet_current_frame(struct packet_sock *po, | |
293 | struct packet_ring_buffer *rb, | |
294 | int status) | |
295 | { | |
296 | return packet_lookup_frame(po, rb, rb->head, status); | |
297 | } | |
298 | ||
299 | static inline void *packet_previous_frame(struct packet_sock *po, | |
300 | struct packet_ring_buffer *rb, | |
301 | int status) | |
302 | { | |
303 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
304 | return packet_lookup_frame(po, rb, previous, status); | |
305 | } | |
306 | ||
307 | static inline void packet_increment_head(struct packet_ring_buffer *buff) | |
308 | { | |
309 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
310 | } | |
311 | ||
1da177e4 LT |
312 | static inline struct packet_sock *pkt_sk(struct sock *sk) |
313 | { | |
314 | return (struct packet_sock *)sk; | |
315 | } | |
316 | ||
317 | static void packet_sock_destruct(struct sock *sk) | |
318 | { | |
ed85b565 RC |
319 | skb_queue_purge(&sk->sk_error_queue); |
320 | ||
547b792c IJ |
321 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
322 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
323 | |
324 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 325 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
326 | return; |
327 | } | |
328 | ||
17ab56a2 | 329 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
330 | } |
331 | ||
332 | ||
90ddc4f0 | 333 | static const struct proto_ops packet_ops; |
1da177e4 | 334 | |
90ddc4f0 | 335 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 336 | |
40d4e3df ED |
337 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
338 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
339 | { |
340 | struct sock *sk; | |
341 | struct sockaddr_pkt *spkt; | |
342 | ||
343 | /* | |
344 | * When we registered the protocol we saved the socket in the data | |
345 | * field for just this event. | |
346 | */ | |
347 | ||
348 | sk = pt->af_packet_priv; | |
1ce4f28b | 349 | |
1da177e4 LT |
350 | /* |
351 | * Yank back the headers [hope the device set this | |
352 | * right or kerboom...] | |
353 | * | |
354 | * Incoming packets have ll header pulled, | |
355 | * push it back. | |
356 | * | |
98e399f8 | 357 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
358 | * so that this procedure is noop. |
359 | */ | |
360 | ||
361 | if (skb->pkt_type == PACKET_LOOPBACK) | |
362 | goto out; | |
363 | ||
09ad9bc7 | 364 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
365 | goto out; |
366 | ||
40d4e3df ED |
367 | skb = skb_share_check(skb, GFP_ATOMIC); |
368 | if (skb == NULL) | |
1da177e4 LT |
369 | goto oom; |
370 | ||
371 | /* drop any routing info */ | |
adf30907 | 372 | skb_dst_drop(skb); |
1da177e4 | 373 | |
84531c24 PO |
374 | /* drop conntrack reference */ |
375 | nf_reset(skb); | |
376 | ||
ffbc6111 | 377 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 378 | |
98e399f8 | 379 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
380 | |
381 | /* | |
382 | * The SOCK_PACKET socket receives _all_ frames. | |
383 | */ | |
384 | ||
385 | spkt->spkt_family = dev->type; | |
386 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
387 | spkt->spkt_protocol = skb->protocol; | |
388 | ||
389 | /* | |
390 | * Charge the memory to the socket. This is done specifically | |
391 | * to prevent sockets using all the memory up. | |
392 | */ | |
393 | ||
40d4e3df | 394 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
395 | return 0; |
396 | ||
397 | out: | |
398 | kfree_skb(skb); | |
399 | oom: | |
400 | return 0; | |
401 | } | |
402 | ||
403 | ||
404 | /* | |
405 | * Output a raw packet to a device layer. This bypasses all the other | |
406 | * protocol layers and you must therefore supply it with a complete frame | |
407 | */ | |
1ce4f28b | 408 | |
1da177e4 LT |
409 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
410 | struct msghdr *msg, size_t len) | |
411 | { | |
412 | struct sock *sk = sock->sk; | |
40d4e3df | 413 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1a35ca80 | 414 | struct sk_buff *skb = NULL; |
1da177e4 | 415 | struct net_device *dev; |
40d4e3df | 416 | __be16 proto = 0; |
1da177e4 | 417 | int err; |
1ce4f28b | 418 | |
1da177e4 | 419 | /* |
1ce4f28b | 420 | * Get and verify the address. |
1da177e4 LT |
421 | */ |
422 | ||
40d4e3df | 423 | if (saddr) { |
1da177e4 | 424 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
425 | return -EINVAL; |
426 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
427 | proto = saddr->spkt_protocol; | |
428 | } else | |
429 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
430 | |
431 | /* | |
1ce4f28b | 432 | * Find the device first to size check it |
1da177e4 LT |
433 | */ |
434 | ||
435 | saddr->spkt_device[13] = 0; | |
1a35ca80 | 436 | retry: |
654d1f8a ED |
437 | rcu_read_lock(); |
438 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
439 | err = -ENODEV; |
440 | if (dev == NULL) | |
441 | goto out_unlock; | |
1ce4f28b | 442 | |
d5e76b0a DM |
443 | err = -ENETDOWN; |
444 | if (!(dev->flags & IFF_UP)) | |
445 | goto out_unlock; | |
446 | ||
1da177e4 | 447 | /* |
40d4e3df ED |
448 | * You may not queue a frame bigger than the mtu. This is the lowest level |
449 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 450 | */ |
1ce4f28b | 451 | |
1da177e4 | 452 | err = -EMSGSIZE; |
8ae55f04 | 453 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
454 | goto out_unlock; |
455 | ||
1a35ca80 ED |
456 | if (!skb) { |
457 | size_t reserved = LL_RESERVED_SPACE(dev); | |
458 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; | |
459 | ||
460 | rcu_read_unlock(); | |
461 | skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL); | |
462 | if (skb == NULL) | |
463 | return -ENOBUFS; | |
464 | /* FIXME: Save some space for broken drivers that write a hard | |
465 | * header at transmission time by themselves. PPP is the notable | |
466 | * one here. This should really be fixed at the driver level. | |
467 | */ | |
468 | skb_reserve(skb, reserved); | |
469 | skb_reset_network_header(skb); | |
470 | ||
471 | /* Try to align data part correctly */ | |
472 | if (hhlen) { | |
473 | skb->data -= hhlen; | |
474 | skb->tail -= hhlen; | |
475 | if (len < hhlen) | |
476 | skb_reset_network_header(skb); | |
477 | } | |
478 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
479 | if (err) | |
480 | goto out_free; | |
481 | goto retry; | |
1da177e4 LT |
482 | } |
483 | ||
1a35ca80 | 484 | |
1da177e4 LT |
485 | skb->protocol = proto; |
486 | skb->dev = dev; | |
487 | skb->priority = sk->sk_priority; | |
2d37a186 | 488 | skb->mark = sk->sk_mark; |
ed85b565 RC |
489 | err = sock_tx_timestamp(msg, sk, skb_tx(skb)); |
490 | if (err < 0) | |
491 | goto out_unlock; | |
1da177e4 LT |
492 | |
493 | dev_queue_xmit(skb); | |
654d1f8a | 494 | rcu_read_unlock(); |
40d4e3df | 495 | return len; |
1da177e4 | 496 | |
1da177e4 | 497 | out_unlock: |
654d1f8a | 498 | rcu_read_unlock(); |
1a35ca80 ED |
499 | out_free: |
500 | kfree_skb(skb); | |
1da177e4 LT |
501 | return err; |
502 | } | |
1da177e4 | 503 | |
dbcb5855 DM |
504 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
505 | unsigned int res) | |
1da177e4 LT |
506 | { |
507 | struct sk_filter *filter; | |
fda9ef5d DM |
508 | |
509 | rcu_read_lock_bh(); | |
a898def2 | 510 | filter = rcu_dereference_bh(sk->sk_filter); |
dbcb5855 DM |
511 | if (filter != NULL) |
512 | res = sk_run_filter(skb, filter->insns, filter->len); | |
fda9ef5d | 513 | rcu_read_unlock_bh(); |
1da177e4 | 514 | |
dbcb5855 | 515 | return res; |
1da177e4 LT |
516 | } |
517 | ||
518 | /* | |
519 | This function makes lazy skb cloning in hope that most of packets | |
520 | are discarded by BPF. | |
521 | ||
522 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
523 | and skb->cb are mangled. It works because (and until) packets | |
524 | falling here are owned by current CPU. Output packets are cloned | |
525 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
526 | sequencially, so that if we return skb to original state on exit, | |
527 | we will not harm anyone. | |
528 | */ | |
529 | ||
40d4e3df ED |
530 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
531 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
532 | { |
533 | struct sock *sk; | |
534 | struct sockaddr_ll *sll; | |
535 | struct packet_sock *po; | |
40d4e3df | 536 | u8 *skb_head = skb->data; |
1da177e4 | 537 | int skb_len = skb->len; |
dbcb5855 | 538 | unsigned int snaplen, res; |
1da177e4 LT |
539 | |
540 | if (skb->pkt_type == PACKET_LOOPBACK) | |
541 | goto drop; | |
542 | ||
543 | sk = pt->af_packet_priv; | |
544 | po = pkt_sk(sk); | |
545 | ||
09ad9bc7 | 546 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
547 | goto drop; |
548 | ||
1da177e4 LT |
549 | skb->dev = dev; |
550 | ||
3b04ddde | 551 | if (dev->header_ops) { |
1da177e4 LT |
552 | /* The device has an explicit notion of ll header, |
553 | exported to higher levels. | |
554 | ||
555 | Otherwise, the device hides datails of it frame | |
556 | structure, so that corresponding packet head | |
557 | never delivered to user. | |
558 | */ | |
559 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 560 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
561 | else if (skb->pkt_type == PACKET_OUTGOING) { |
562 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 563 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
564 | } |
565 | } | |
566 | ||
567 | snaplen = skb->len; | |
568 | ||
dbcb5855 DM |
569 | res = run_filter(skb, sk, snaplen); |
570 | if (!res) | |
fda9ef5d | 571 | goto drop_n_restore; |
dbcb5855 DM |
572 | if (snaplen > res) |
573 | snaplen = res; | |
1da177e4 LT |
574 | |
575 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
576 | (unsigned)sk->sk_rcvbuf) | |
577 | goto drop_n_acct; | |
578 | ||
579 | if (skb_shared(skb)) { | |
580 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
581 | if (nskb == NULL) | |
582 | goto drop_n_acct; | |
583 | ||
584 | if (skb_head != skb->data) { | |
585 | skb->data = skb_head; | |
586 | skb->len = skb_len; | |
587 | } | |
588 | kfree_skb(skb); | |
589 | skb = nskb; | |
590 | } | |
591 | ||
ffbc6111 HX |
592 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
593 | sizeof(skb->cb)); | |
594 | ||
595 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
596 | sll->sll_family = AF_PACKET; |
597 | sll->sll_hatype = dev->type; | |
598 | sll->sll_protocol = skb->protocol; | |
599 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 600 | if (unlikely(po->origdev)) |
80feaacb PWJ |
601 | sll->sll_ifindex = orig_dev->ifindex; |
602 | else | |
603 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 604 | |
b95cce35 | 605 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 606 | |
ffbc6111 | 607 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 608 | |
1da177e4 LT |
609 | if (pskb_trim(skb, snaplen)) |
610 | goto drop_n_acct; | |
611 | ||
612 | skb_set_owner_r(skb, sk); | |
613 | skb->dev = NULL; | |
adf30907 | 614 | skb_dst_drop(skb); |
1da177e4 | 615 | |
84531c24 PO |
616 | /* drop conntrack reference */ |
617 | nf_reset(skb); | |
618 | ||
1da177e4 LT |
619 | spin_lock(&sk->sk_receive_queue.lock); |
620 | po->stats.tp_packets++; | |
3b885787 | 621 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
622 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
623 | spin_unlock(&sk->sk_receive_queue.lock); | |
624 | sk->sk_data_ready(sk, skb->len); | |
625 | return 0; | |
626 | ||
627 | drop_n_acct: | |
3b885787 | 628 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
1da177e4 LT |
629 | |
630 | drop_n_restore: | |
631 | if (skb_head != skb->data && skb_shared(skb)) { | |
632 | skb->data = skb_head; | |
633 | skb->len = skb_len; | |
634 | } | |
635 | drop: | |
ead2ceb0 | 636 | consume_skb(skb); |
1da177e4 LT |
637 | return 0; |
638 | } | |
639 | ||
40d4e3df ED |
640 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
641 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
642 | { |
643 | struct sock *sk; | |
644 | struct packet_sock *po; | |
645 | struct sockaddr_ll *sll; | |
bbd6ef87 PM |
646 | union { |
647 | struct tpacket_hdr *h1; | |
648 | struct tpacket2_hdr *h2; | |
649 | void *raw; | |
650 | } h; | |
40d4e3df | 651 | u8 *skb_head = skb->data; |
1da177e4 | 652 | int skb_len = skb->len; |
dbcb5855 | 653 | unsigned int snaplen, res; |
1da177e4 | 654 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
bbd6ef87 | 655 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 656 | struct sk_buff *copy_skb = NULL; |
b7aa0bf7 | 657 | struct timeval tv; |
bbd6ef87 | 658 | struct timespec ts; |
1da177e4 LT |
659 | |
660 | if (skb->pkt_type == PACKET_LOOPBACK) | |
661 | goto drop; | |
662 | ||
663 | sk = pt->af_packet_priv; | |
664 | po = pkt_sk(sk); | |
665 | ||
09ad9bc7 | 666 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
667 | goto drop; |
668 | ||
3b04ddde | 669 | if (dev->header_ops) { |
1da177e4 | 670 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 671 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
672 | else if (skb->pkt_type == PACKET_OUTGOING) { |
673 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 674 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
675 | } |
676 | } | |
677 | ||
8dc41944 HX |
678 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
679 | status |= TP_STATUS_CSUMNOTREADY; | |
680 | ||
1da177e4 LT |
681 | snaplen = skb->len; |
682 | ||
dbcb5855 DM |
683 | res = run_filter(skb, sk, snaplen); |
684 | if (!res) | |
fda9ef5d | 685 | goto drop_n_restore; |
dbcb5855 DM |
686 | if (snaplen > res) |
687 | snaplen = res; | |
1da177e4 LT |
688 | |
689 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
690 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
691 | po->tp_reserve; | |
1da177e4 | 692 | } else { |
bbe735e4 | 693 | unsigned maclen = skb_network_offset(skb); |
bbd6ef87 | 694 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
695 | (maclen < 16 ? 16 : maclen)) + |
696 | po->tp_reserve; | |
1da177e4 LT |
697 | macoff = netoff - maclen; |
698 | } | |
699 | ||
69e3c75f | 700 | if (macoff + snaplen > po->rx_ring.frame_size) { |
1da177e4 LT |
701 | if (po->copy_thresh && |
702 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
703 | (unsigned)sk->sk_rcvbuf) { | |
704 | if (skb_shared(skb)) { | |
705 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
706 | } else { | |
707 | copy_skb = skb_get(skb); | |
708 | skb_head = skb->data; | |
709 | } | |
710 | if (copy_skb) | |
711 | skb_set_owner_r(copy_skb, sk); | |
712 | } | |
69e3c75f | 713 | snaplen = po->rx_ring.frame_size - macoff; |
1da177e4 LT |
714 | if ((int)snaplen < 0) |
715 | snaplen = 0; | |
716 | } | |
1da177e4 LT |
717 | |
718 | spin_lock(&sk->sk_receive_queue.lock); | |
69e3c75f | 719 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
bbd6ef87 | 720 | if (!h.raw) |
1da177e4 | 721 | goto ring_is_full; |
69e3c75f | 722 | packet_increment_head(&po->rx_ring); |
1da177e4 LT |
723 | po->stats.tp_packets++; |
724 | if (copy_skb) { | |
725 | status |= TP_STATUS_COPY; | |
726 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
727 | } | |
728 | if (!po->stats.tp_drops) | |
729 | status &= ~TP_STATUS_LOSING; | |
730 | spin_unlock(&sk->sk_receive_queue.lock); | |
731 | ||
bbd6ef87 | 732 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
1da177e4 | 733 | |
bbd6ef87 PM |
734 | switch (po->tp_version) { |
735 | case TPACKET_V1: | |
736 | h.h1->tp_len = skb->len; | |
737 | h.h1->tp_snaplen = snaplen; | |
738 | h.h1->tp_mac = macoff; | |
739 | h.h1->tp_net = netoff; | |
740 | if (skb->tstamp.tv64) | |
741 | tv = ktime_to_timeval(skb->tstamp); | |
742 | else | |
743 | do_gettimeofday(&tv); | |
744 | h.h1->tp_sec = tv.tv_sec; | |
745 | h.h1->tp_usec = tv.tv_usec; | |
746 | hdrlen = sizeof(*h.h1); | |
747 | break; | |
748 | case TPACKET_V2: | |
749 | h.h2->tp_len = skb->len; | |
750 | h.h2->tp_snaplen = snaplen; | |
751 | h.h2->tp_mac = macoff; | |
752 | h.h2->tp_net = netoff; | |
753 | if (skb->tstamp.tv64) | |
754 | ts = ktime_to_timespec(skb->tstamp); | |
755 | else | |
756 | getnstimeofday(&ts); | |
757 | h.h2->tp_sec = ts.tv_sec; | |
758 | h.h2->tp_nsec = ts.tv_nsec; | |
05423b24 | 759 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
bbd6ef87 PM |
760 | hdrlen = sizeof(*h.h2); |
761 | break; | |
762 | default: | |
763 | BUG(); | |
764 | } | |
1da177e4 | 765 | |
bbd6ef87 | 766 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 767 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
768 | sll->sll_family = AF_PACKET; |
769 | sll->sll_hatype = dev->type; | |
770 | sll->sll_protocol = skb->protocol; | |
771 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 772 | if (unlikely(po->origdev)) |
80feaacb PWJ |
773 | sll->sll_ifindex = orig_dev->ifindex; |
774 | else | |
775 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 776 | |
bbd6ef87 | 777 | __packet_set_status(po, h.raw, status); |
e16aa207 | 778 | smp_mb(); |
1da177e4 LT |
779 | { |
780 | struct page *p_start, *p_end; | |
bbd6ef87 | 781 | u8 *h_end = h.raw + macoff + snaplen - 1; |
1da177e4 | 782 | |
bbd6ef87 | 783 | p_start = virt_to_page(h.raw); |
1da177e4 LT |
784 | p_end = virt_to_page(h_end); |
785 | while (p_start <= p_end) { | |
786 | flush_dcache_page(p_start); | |
787 | p_start++; | |
788 | } | |
789 | } | |
790 | ||
791 | sk->sk_data_ready(sk, 0); | |
792 | ||
793 | drop_n_restore: | |
794 | if (skb_head != skb->data && skb_shared(skb)) { | |
795 | skb->data = skb_head; | |
796 | skb->len = skb_len; | |
797 | } | |
798 | drop: | |
1ce4f28b | 799 | kfree_skb(skb); |
1da177e4 LT |
800 | return 0; |
801 | ||
802 | ring_is_full: | |
803 | po->stats.tp_drops++; | |
804 | spin_unlock(&sk->sk_receive_queue.lock); | |
805 | ||
806 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 807 | kfree_skb(copy_skb); |
1da177e4 LT |
808 | goto drop_n_restore; |
809 | } | |
810 | ||
69e3c75f JB |
811 | static void tpacket_destruct_skb(struct sk_buff *skb) |
812 | { | |
813 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 814 | void *ph; |
1da177e4 | 815 | |
69e3c75f | 816 | BUG_ON(skb == NULL); |
1da177e4 | 817 | |
69e3c75f JB |
818 | if (likely(po->tx_ring.pg_vec)) { |
819 | ph = skb_shinfo(skb)->destructor_arg; | |
820 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); | |
821 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); | |
822 | atomic_dec(&po->tx_ring.pending); | |
823 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); | |
824 | } | |
825 | ||
826 | sock_wfree(skb); | |
827 | } | |
828 | ||
40d4e3df ED |
829 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
830 | void *frame, struct net_device *dev, int size_max, | |
831 | __be16 proto, unsigned char *addr) | |
69e3c75f JB |
832 | { |
833 | union { | |
834 | struct tpacket_hdr *h1; | |
835 | struct tpacket2_hdr *h2; | |
836 | void *raw; | |
837 | } ph; | |
838 | int to_write, offset, len, tp_len, nr_frags, len_max; | |
839 | struct socket *sock = po->sk.sk_socket; | |
840 | struct page *page; | |
841 | void *data; | |
842 | int err; | |
843 | ||
844 | ph.raw = frame; | |
845 | ||
846 | skb->protocol = proto; | |
847 | skb->dev = dev; | |
848 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 849 | skb->mark = po->sk.sk_mark; |
69e3c75f JB |
850 | skb_shinfo(skb)->destructor_arg = ph.raw; |
851 | ||
852 | switch (po->tp_version) { | |
853 | case TPACKET_V2: | |
854 | tp_len = ph.h2->tp_len; | |
855 | break; | |
856 | default: | |
857 | tp_len = ph.h1->tp_len; | |
858 | break; | |
859 | } | |
860 | if (unlikely(tp_len > size_max)) { | |
40d4e3df | 861 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
69e3c75f JB |
862 | return -EMSGSIZE; |
863 | } | |
864 | ||
865 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
866 | skb_reset_network_header(skb); | |
867 | ||
868 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
869 | to_write = tp_len; | |
870 | ||
871 | if (sock->type == SOCK_DGRAM) { | |
872 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
873 | NULL, tp_len); | |
874 | if (unlikely(err < 0)) | |
875 | return -EINVAL; | |
40d4e3df | 876 | } else if (dev->hard_header_len) { |
69e3c75f JB |
877 | /* net device doesn't like empty head */ |
878 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
879 | pr_err("packet size is too short (%d < %d)\n", |
880 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
881 | return -EINVAL; |
882 | } | |
883 | ||
884 | skb_push(skb, dev->hard_header_len); | |
885 | err = skb_store_bits(skb, 0, data, | |
886 | dev->hard_header_len); | |
887 | if (unlikely(err)) | |
888 | return err; | |
889 | ||
890 | data += dev->hard_header_len; | |
891 | to_write -= dev->hard_header_len; | |
892 | } | |
893 | ||
894 | err = -EFAULT; | |
895 | page = virt_to_page(data); | |
896 | offset = offset_in_page(data); | |
897 | len_max = PAGE_SIZE - offset; | |
898 | len = ((to_write > len_max) ? len_max : to_write); | |
899 | ||
900 | skb->data_len = to_write; | |
901 | skb->len += to_write; | |
902 | skb->truesize += to_write; | |
903 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
904 | ||
905 | while (likely(to_write)) { | |
906 | nr_frags = skb_shinfo(skb)->nr_frags; | |
907 | ||
908 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
909 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
910 | MAX_SKB_FRAGS); | |
69e3c75f JB |
911 | return -EFAULT; |
912 | } | |
913 | ||
914 | flush_dcache_page(page); | |
915 | get_page(page); | |
916 | skb_fill_page_desc(skb, | |
917 | nr_frags, | |
918 | page++, offset, len); | |
919 | to_write -= len; | |
920 | offset = 0; | |
921 | len_max = PAGE_SIZE; | |
922 | len = ((to_write > len_max) ? len_max : to_write); | |
923 | } | |
924 | ||
925 | return tp_len; | |
926 | } | |
927 | ||
928 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
929 | { | |
930 | struct socket *sock; | |
931 | struct sk_buff *skb; | |
932 | struct net_device *dev; | |
933 | __be16 proto; | |
934 | int ifindex, err, reserve = 0; | |
40d4e3df ED |
935 | void *ph; |
936 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
937 | int tp_len, size_max; |
938 | unsigned char *addr; | |
939 | int len_sum = 0; | |
940 | int status = 0; | |
941 | ||
942 | sock = po->sk.sk_socket; | |
943 | ||
944 | mutex_lock(&po->pg_vec_lock); | |
945 | ||
946 | err = -EBUSY; | |
947 | if (saddr == NULL) { | |
948 | ifindex = po->ifindex; | |
949 | proto = po->num; | |
950 | addr = NULL; | |
951 | } else { | |
952 | err = -EINVAL; | |
953 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
954 | goto out; | |
955 | if (msg->msg_namelen < (saddr->sll_halen | |
956 | + offsetof(struct sockaddr_ll, | |
957 | sll_addr))) | |
958 | goto out; | |
959 | ifindex = saddr->sll_ifindex; | |
960 | proto = saddr->sll_protocol; | |
961 | addr = saddr->sll_addr; | |
962 | } | |
963 | ||
964 | dev = dev_get_by_index(sock_net(&po->sk), ifindex); | |
965 | err = -ENXIO; | |
966 | if (unlikely(dev == NULL)) | |
967 | goto out; | |
968 | ||
969 | reserve = dev->hard_header_len; | |
970 | ||
971 | err = -ENETDOWN; | |
972 | if (unlikely(!(dev->flags & IFF_UP))) | |
973 | goto out_put; | |
974 | ||
975 | size_max = po->tx_ring.frame_size | |
b5dd884e | 976 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f JB |
977 | |
978 | if (size_max > dev->mtu + reserve) | |
979 | size_max = dev->mtu + reserve; | |
980 | ||
981 | do { | |
982 | ph = packet_current_frame(po, &po->tx_ring, | |
983 | TP_STATUS_SEND_REQUEST); | |
984 | ||
985 | if (unlikely(ph == NULL)) { | |
986 | schedule(); | |
987 | continue; | |
988 | } | |
989 | ||
990 | status = TP_STATUS_SEND_REQUEST; | |
991 | skb = sock_alloc_send_skb(&po->sk, | |
992 | LL_ALLOCATED_SPACE(dev) | |
993 | + sizeof(struct sockaddr_ll), | |
994 | 0, &err); | |
995 | ||
996 | if (unlikely(skb == NULL)) | |
997 | goto out_status; | |
998 | ||
999 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
1000 | addr); | |
1001 | ||
1002 | if (unlikely(tp_len < 0)) { | |
1003 | if (po->tp_loss) { | |
1004 | __packet_set_status(po, ph, | |
1005 | TP_STATUS_AVAILABLE); | |
1006 | packet_increment_head(&po->tx_ring); | |
1007 | kfree_skb(skb); | |
1008 | continue; | |
1009 | } else { | |
1010 | status = TP_STATUS_WRONG_FORMAT; | |
1011 | err = tp_len; | |
1012 | goto out_status; | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | skb->destructor = tpacket_destruct_skb; | |
1017 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
1018 | atomic_inc(&po->tx_ring.pending); | |
1019 | ||
1020 | status = TP_STATUS_SEND_REQUEST; | |
1021 | err = dev_queue_xmit(skb); | |
eb70df13 JP |
1022 | if (unlikely(err > 0)) { |
1023 | err = net_xmit_errno(err); | |
1024 | if (err && __packet_get_status(po, ph) == | |
1025 | TP_STATUS_AVAILABLE) { | |
1026 | /* skb was destructed already */ | |
1027 | skb = NULL; | |
1028 | goto out_status; | |
1029 | } | |
1030 | /* | |
1031 | * skb was dropped but not destructed yet; | |
1032 | * let's treat it like congestion or err < 0 | |
1033 | */ | |
1034 | err = 0; | |
1035 | } | |
69e3c75f JB |
1036 | packet_increment_head(&po->tx_ring); |
1037 | len_sum += tp_len; | |
f64f9e71 JP |
1038 | } while (likely((ph != NULL) || |
1039 | ((!(msg->msg_flags & MSG_DONTWAIT)) && | |
1040 | (atomic_read(&po->tx_ring.pending)))) | |
1041 | ); | |
69e3c75f JB |
1042 | |
1043 | err = len_sum; | |
1044 | goto out_put; | |
1045 | ||
69e3c75f JB |
1046 | out_status: |
1047 | __packet_set_status(po, ph, status); | |
1048 | kfree_skb(skb); | |
1049 | out_put: | |
1050 | dev_put(dev); | |
1051 | out: | |
1052 | mutex_unlock(&po->pg_vec_lock); | |
1053 | return err; | |
1054 | } | |
69e3c75f | 1055 | |
bfd5f4a3 SS |
1056 | static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
1057 | size_t reserve, size_t len, | |
1058 | size_t linear, int noblock, | |
1059 | int *err) | |
1060 | { | |
1061 | struct sk_buff *skb; | |
1062 | ||
1063 | /* Under a page? Don't bother with paged skb. */ | |
1064 | if (prepad + len < PAGE_SIZE || !linear) | |
1065 | linear = len; | |
1066 | ||
1067 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
1068 | err); | |
1069 | if (!skb) | |
1070 | return NULL; | |
1071 | ||
1072 | skb_reserve(skb, reserve); | |
1073 | skb_put(skb, linear); | |
1074 | skb->data_len = len - linear; | |
1075 | skb->len += len - linear; | |
1076 | ||
1077 | return skb; | |
1078 | } | |
1079 | ||
69e3c75f | 1080 | static int packet_snd(struct socket *sock, |
1da177e4 LT |
1081 | struct msghdr *msg, size_t len) |
1082 | { | |
1083 | struct sock *sk = sock->sk; | |
40d4e3df | 1084 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
1085 | struct sk_buff *skb; |
1086 | struct net_device *dev; | |
0e11c91e | 1087 | __be16 proto; |
1da177e4 LT |
1088 | unsigned char *addr; |
1089 | int ifindex, err, reserve = 0; | |
bfd5f4a3 SS |
1090 | struct virtio_net_hdr vnet_hdr = { 0 }; |
1091 | int offset = 0; | |
1092 | int vnet_hdr_len; | |
1093 | struct packet_sock *po = pkt_sk(sk); | |
1094 | unsigned short gso_type = 0; | |
1da177e4 LT |
1095 | |
1096 | /* | |
1ce4f28b | 1097 | * Get and verify the address. |
1da177e4 | 1098 | */ |
1ce4f28b | 1099 | |
1da177e4 | 1100 | if (saddr == NULL) { |
1da177e4 LT |
1101 | ifindex = po->ifindex; |
1102 | proto = po->num; | |
1103 | addr = NULL; | |
1104 | } else { | |
1105 | err = -EINVAL; | |
1106 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1107 | goto out; | |
0fb375fb EB |
1108 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1109 | goto out; | |
1da177e4 LT |
1110 | ifindex = saddr->sll_ifindex; |
1111 | proto = saddr->sll_protocol; | |
1112 | addr = saddr->sll_addr; | |
1113 | } | |
1114 | ||
1115 | ||
3b1e0a65 | 1116 | dev = dev_get_by_index(sock_net(sk), ifindex); |
1da177e4 LT |
1117 | err = -ENXIO; |
1118 | if (dev == NULL) | |
1119 | goto out_unlock; | |
1120 | if (sock->type == SOCK_RAW) | |
1121 | reserve = dev->hard_header_len; | |
1122 | ||
d5e76b0a DM |
1123 | err = -ENETDOWN; |
1124 | if (!(dev->flags & IFF_UP)) | |
1125 | goto out_unlock; | |
1126 | ||
bfd5f4a3 SS |
1127 | if (po->has_vnet_hdr) { |
1128 | vnet_hdr_len = sizeof(vnet_hdr); | |
1129 | ||
1130 | err = -EINVAL; | |
1131 | if (len < vnet_hdr_len) | |
1132 | goto out_unlock; | |
1133 | ||
1134 | len -= vnet_hdr_len; | |
1135 | ||
1136 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, | |
1137 | vnet_hdr_len); | |
1138 | if (err < 0) | |
1139 | goto out_unlock; | |
1140 | ||
1141 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
1142 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
1143 | vnet_hdr.hdr_len)) | |
1144 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
1145 | vnet_hdr.csum_offset + 2; | |
1146 | ||
1147 | err = -EINVAL; | |
1148 | if (vnet_hdr.hdr_len > len) | |
1149 | goto out_unlock; | |
1150 | ||
1151 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
1152 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1153 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
1154 | gso_type = SKB_GSO_TCPV4; | |
1155 | break; | |
1156 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
1157 | gso_type = SKB_GSO_TCPV6; | |
1158 | break; | |
1159 | case VIRTIO_NET_HDR_GSO_UDP: | |
1160 | gso_type = SKB_GSO_UDP; | |
1161 | break; | |
1162 | default: | |
1163 | goto out_unlock; | |
1164 | } | |
1165 | ||
1166 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
1167 | gso_type |= SKB_GSO_TCP_ECN; | |
1168 | ||
1169 | if (vnet_hdr.gso_size == 0) | |
1170 | goto out_unlock; | |
1171 | ||
1172 | } | |
1173 | } | |
1174 | ||
1da177e4 | 1175 | err = -EMSGSIZE; |
bfd5f4a3 | 1176 | if (!gso_type && (len > dev->mtu+reserve)) |
1da177e4 LT |
1177 | goto out_unlock; |
1178 | ||
bfd5f4a3 SS |
1179 | err = -ENOBUFS; |
1180 | skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev), | |
1181 | LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len, | |
1182 | msg->msg_flags & MSG_DONTWAIT, &err); | |
40d4e3df | 1183 | if (skb == NULL) |
1da177e4 LT |
1184 | goto out_unlock; |
1185 | ||
bfd5f4a3 | 1186 | skb_set_network_header(skb, reserve); |
1da177e4 | 1187 | |
0c4e8581 SH |
1188 | err = -EINVAL; |
1189 | if (sock->type == SOCK_DGRAM && | |
bfd5f4a3 | 1190 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
0c4e8581 | 1191 | goto out_free; |
1da177e4 LT |
1192 | |
1193 | /* Returns -EFAULT on error */ | |
bfd5f4a3 | 1194 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
1da177e4 LT |
1195 | if (err) |
1196 | goto out_free; | |
ed85b565 RC |
1197 | err = sock_tx_timestamp(msg, sk, skb_tx(skb)); |
1198 | if (err < 0) | |
1199 | goto out_free; | |
1da177e4 LT |
1200 | |
1201 | skb->protocol = proto; | |
1202 | skb->dev = dev; | |
1203 | skb->priority = sk->sk_priority; | |
2d37a186 | 1204 | skb->mark = sk->sk_mark; |
1da177e4 | 1205 | |
bfd5f4a3 SS |
1206 | if (po->has_vnet_hdr) { |
1207 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
1208 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, | |
1209 | vnet_hdr.csum_offset)) { | |
1210 | err = -EINVAL; | |
1211 | goto out_free; | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; | |
1216 | skb_shinfo(skb)->gso_type = gso_type; | |
1217 | ||
1218 | /* Header must be checked, and gso_segs computed. */ | |
1219 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1220 | skb_shinfo(skb)->gso_segs = 0; | |
1221 | ||
1222 | len += vnet_hdr_len; | |
1223 | } | |
1224 | ||
1da177e4 LT |
1225 | /* |
1226 | * Now send it | |
1227 | */ | |
1228 | ||
1229 | err = dev_queue_xmit(skb); | |
1230 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
1231 | goto out_unlock; | |
1232 | ||
1233 | dev_put(dev); | |
1234 | ||
40d4e3df | 1235 | return len; |
1da177e4 LT |
1236 | |
1237 | out_free: | |
1238 | kfree_skb(skb); | |
1239 | out_unlock: | |
1240 | if (dev) | |
1241 | dev_put(dev); | |
1242 | out: | |
1243 | return err; | |
1244 | } | |
1245 | ||
69e3c75f JB |
1246 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1247 | struct msghdr *msg, size_t len) | |
1248 | { | |
69e3c75f JB |
1249 | struct sock *sk = sock->sk; |
1250 | struct packet_sock *po = pkt_sk(sk); | |
1251 | if (po->tx_ring.pg_vec) | |
1252 | return tpacket_snd(po, msg); | |
1253 | else | |
69e3c75f JB |
1254 | return packet_snd(sock, msg, len); |
1255 | } | |
1256 | ||
1da177e4 LT |
1257 | /* |
1258 | * Close a PACKET socket. This is fairly simple. We immediately go | |
1259 | * to 'closed' state and remove our protocol entry in the device list. | |
1260 | */ | |
1261 | ||
1262 | static int packet_release(struct socket *sock) | |
1263 | { | |
1264 | struct sock *sk = sock->sk; | |
1265 | struct packet_sock *po; | |
d12d01d6 | 1266 | struct net *net; |
69e3c75f | 1267 | struct tpacket_req req; |
1da177e4 LT |
1268 | |
1269 | if (!sk) | |
1270 | return 0; | |
1271 | ||
3b1e0a65 | 1272 | net = sock_net(sk); |
1da177e4 LT |
1273 | po = pkt_sk(sk); |
1274 | ||
808f5114 | 1275 | spin_lock_bh(&net->packet.sklist_lock); |
1276 | sk_del_node_init_rcu(sk); | |
920de804 | 1277 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
808f5114 | 1278 | spin_unlock_bh(&net->packet.sklist_lock); |
1da177e4 | 1279 | |
808f5114 | 1280 | spin_lock(&po->bind_lock); |
1da177e4 LT |
1281 | if (po->running) { |
1282 | /* | |
808f5114 | 1283 | * Remove from protocol table |
1da177e4 | 1284 | */ |
1da177e4 LT |
1285 | po->running = 0; |
1286 | po->num = 0; | |
808f5114 | 1287 | __dev_remove_pack(&po->prot_hook); |
1da177e4 LT |
1288 | __sock_put(sk); |
1289 | } | |
808f5114 | 1290 | spin_unlock(&po->bind_lock); |
1da177e4 | 1291 | |
1da177e4 | 1292 | packet_flush_mclist(sk); |
1da177e4 | 1293 | |
69e3c75f JB |
1294 | memset(&req, 0, sizeof(req)); |
1295 | ||
1296 | if (po->rx_ring.pg_vec) | |
1297 | packet_set_ring(sk, &req, 1, 0); | |
1298 | ||
1299 | if (po->tx_ring.pg_vec) | |
1300 | packet_set_ring(sk, &req, 1, 1); | |
1da177e4 | 1301 | |
808f5114 | 1302 | synchronize_net(); |
1da177e4 LT |
1303 | /* |
1304 | * Now the socket is dead. No more input will appear. | |
1305 | */ | |
1da177e4 LT |
1306 | sock_orphan(sk); |
1307 | sock->sk = NULL; | |
1308 | ||
1309 | /* Purge queues */ | |
1310 | ||
1311 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 1312 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1313 | |
1314 | sock_put(sk); | |
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * Attach a packet hook. | |
1320 | */ | |
1321 | ||
0e11c91e | 1322 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
1323 | { |
1324 | struct packet_sock *po = pkt_sk(sk); | |
1325 | /* | |
1326 | * Detach an existing hook if present. | |
1327 | */ | |
1328 | ||
1329 | lock_sock(sk); | |
1330 | ||
1331 | spin_lock(&po->bind_lock); | |
1332 | if (po->running) { | |
1333 | __sock_put(sk); | |
1334 | po->running = 0; | |
1335 | po->num = 0; | |
1336 | spin_unlock(&po->bind_lock); | |
1337 | dev_remove_pack(&po->prot_hook); | |
1338 | spin_lock(&po->bind_lock); | |
1339 | } | |
1340 | ||
1341 | po->num = protocol; | |
1342 | po->prot_hook.type = protocol; | |
1343 | po->prot_hook.dev = dev; | |
1344 | ||
1345 | po->ifindex = dev ? dev->ifindex : 0; | |
1346 | ||
1347 | if (protocol == 0) | |
1348 | goto out_unlock; | |
1349 | ||
be85d4ad | 1350 | if (!dev || (dev->flags & IFF_UP)) { |
1da177e4 LT |
1351 | dev_add_pack(&po->prot_hook); |
1352 | sock_hold(sk); | |
1353 | po->running = 1; | |
be85d4ad UT |
1354 | } else { |
1355 | sk->sk_err = ENETDOWN; | |
1356 | if (!sock_flag(sk, SOCK_DEAD)) | |
1357 | sk->sk_error_report(sk); | |
1da177e4 LT |
1358 | } |
1359 | ||
1360 | out_unlock: | |
1361 | spin_unlock(&po->bind_lock); | |
1362 | release_sock(sk); | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | /* | |
1367 | * Bind a packet socket to a device | |
1368 | */ | |
1369 | ||
40d4e3df ED |
1370 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1371 | int addr_len) | |
1da177e4 | 1372 | { |
40d4e3df | 1373 | struct sock *sk = sock->sk; |
1da177e4 LT |
1374 | char name[15]; |
1375 | struct net_device *dev; | |
1376 | int err = -ENODEV; | |
1ce4f28b | 1377 | |
1da177e4 LT |
1378 | /* |
1379 | * Check legality | |
1380 | */ | |
1ce4f28b | 1381 | |
8ae55f04 | 1382 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 1383 | return -EINVAL; |
40d4e3df | 1384 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 1385 | |
3b1e0a65 | 1386 | dev = dev_get_by_name(sock_net(sk), name); |
1da177e4 LT |
1387 | if (dev) { |
1388 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
1389 | dev_put(dev); | |
1390 | } | |
1391 | return err; | |
1392 | } | |
1da177e4 LT |
1393 | |
1394 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1395 | { | |
40d4e3df ED |
1396 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1397 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1398 | struct net_device *dev = NULL; |
1399 | int err; | |
1400 | ||
1401 | ||
1402 | /* | |
1403 | * Check legality | |
1404 | */ | |
1ce4f28b | 1405 | |
1da177e4 LT |
1406 | if (addr_len < sizeof(struct sockaddr_ll)) |
1407 | return -EINVAL; | |
1408 | if (sll->sll_family != AF_PACKET) | |
1409 | return -EINVAL; | |
1410 | ||
1411 | if (sll->sll_ifindex) { | |
1412 | err = -ENODEV; | |
3b1e0a65 | 1413 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
1414 | if (dev == NULL) |
1415 | goto out; | |
1416 | } | |
1417 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1418 | if (dev) | |
1419 | dev_put(dev); | |
1420 | ||
1421 | out: | |
1422 | return err; | |
1423 | } | |
1424 | ||
1425 | static struct proto packet_proto = { | |
1426 | .name = "PACKET", | |
1427 | .owner = THIS_MODULE, | |
1428 | .obj_size = sizeof(struct packet_sock), | |
1429 | }; | |
1430 | ||
1431 | /* | |
1ce4f28b | 1432 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
1433 | */ |
1434 | ||
3f378b68 EP |
1435 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
1436 | int kern) | |
1da177e4 LT |
1437 | { |
1438 | struct sock *sk; | |
1439 | struct packet_sock *po; | |
0e11c91e | 1440 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1441 | int err; |
1442 | ||
1443 | if (!capable(CAP_NET_RAW)) | |
1444 | return -EPERM; | |
be02097c DM |
1445 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1446 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
1447 | return -ESOCKTNOSUPPORT; |
1448 | ||
1449 | sock->state = SS_UNCONNECTED; | |
1450 | ||
1451 | err = -ENOBUFS; | |
6257ff21 | 1452 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
1453 | if (sk == NULL) |
1454 | goto out; | |
1455 | ||
1456 | sock->ops = &packet_ops; | |
1da177e4 LT |
1457 | if (sock->type == SOCK_PACKET) |
1458 | sock->ops = &packet_ops_spkt; | |
be02097c | 1459 | |
1da177e4 LT |
1460 | sock_init_data(sock, sk); |
1461 | ||
1462 | po = pkt_sk(sk); | |
1463 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1464 | po->num = proto; |
1da177e4 LT |
1465 | |
1466 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 1467 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
1468 | |
1469 | /* | |
1470 | * Attach a protocol block | |
1471 | */ | |
1472 | ||
1473 | spin_lock_init(&po->bind_lock); | |
905db440 | 1474 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 1475 | po->prot_hook.func = packet_rcv; |
be02097c | 1476 | |
1da177e4 LT |
1477 | if (sock->type == SOCK_PACKET) |
1478 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1479 | |
1da177e4 LT |
1480 | po->prot_hook.af_packet_priv = sk; |
1481 | ||
0e11c91e AV |
1482 | if (proto) { |
1483 | po->prot_hook.type = proto; | |
1da177e4 LT |
1484 | dev_add_pack(&po->prot_hook); |
1485 | sock_hold(sk); | |
1486 | po->running = 1; | |
1487 | } | |
1488 | ||
808f5114 | 1489 | spin_lock_bh(&net->packet.sklist_lock); |
1490 | sk_add_node_rcu(sk, &net->packet.sklist); | |
3680453c | 1491 | sock_prot_inuse_add(net, &packet_proto, 1); |
808f5114 | 1492 | spin_unlock_bh(&net->packet.sklist_lock); |
1493 | ||
40d4e3df | 1494 | return 0; |
1da177e4 LT |
1495 | out: |
1496 | return err; | |
1497 | } | |
1498 | ||
ed85b565 RC |
1499 | static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len) |
1500 | { | |
1501 | struct sock_exterr_skb *serr; | |
1502 | struct sk_buff *skb, *skb2; | |
1503 | int copied, err; | |
1504 | ||
1505 | err = -EAGAIN; | |
1506 | skb = skb_dequeue(&sk->sk_error_queue); | |
1507 | if (skb == NULL) | |
1508 | goto out; | |
1509 | ||
1510 | copied = skb->len; | |
1511 | if (copied > len) { | |
1512 | msg->msg_flags |= MSG_TRUNC; | |
1513 | copied = len; | |
1514 | } | |
1515 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1516 | if (err) | |
1517 | goto out_free_skb; | |
1518 | ||
1519 | sock_recv_timestamp(msg, sk, skb); | |
1520 | ||
1521 | serr = SKB_EXT_ERR(skb); | |
1522 | put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP, | |
1523 | sizeof(serr->ee), &serr->ee); | |
1524 | ||
1525 | msg->msg_flags |= MSG_ERRQUEUE; | |
1526 | err = copied; | |
1527 | ||
1528 | /* Reset and regenerate socket error */ | |
1529 | spin_lock_bh(&sk->sk_error_queue.lock); | |
1530 | sk->sk_err = 0; | |
1531 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
1532 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
1533 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1534 | sk->sk_error_report(sk); | |
1535 | } else | |
1536 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1537 | ||
1538 | out_free_skb: | |
1539 | kfree_skb(skb); | |
1540 | out: | |
1541 | return err; | |
1542 | } | |
1543 | ||
1da177e4 LT |
1544 | /* |
1545 | * Pull a packet from our receive queue and hand it to the user. | |
1546 | * If necessary we block. | |
1547 | */ | |
1548 | ||
1549 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1550 | struct msghdr *msg, size_t len, int flags) | |
1551 | { | |
1552 | struct sock *sk = sock->sk; | |
1553 | struct sk_buff *skb; | |
1554 | int copied, err; | |
0fb375fb | 1555 | struct sockaddr_ll *sll; |
bfd5f4a3 | 1556 | int vnet_hdr_len = 0; |
1da177e4 LT |
1557 | |
1558 | err = -EINVAL; | |
ed85b565 | 1559 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
1da177e4 LT |
1560 | goto out; |
1561 | ||
1562 | #if 0 | |
1563 | /* What error should we return now? EUNATTACH? */ | |
1564 | if (pkt_sk(sk)->ifindex < 0) | |
1565 | return -ENODEV; | |
1566 | #endif | |
1567 | ||
ed85b565 RC |
1568 | if (flags & MSG_ERRQUEUE) { |
1569 | err = packet_recv_error(sk, msg, len); | |
1570 | goto out; | |
1571 | } | |
1572 | ||
1da177e4 LT |
1573 | /* |
1574 | * Call the generic datagram receiver. This handles all sorts | |
1575 | * of horrible races and re-entrancy so we can forget about it | |
1576 | * in the protocol layers. | |
1577 | * | |
1578 | * Now it will return ENETDOWN, if device have just gone down, | |
1579 | * but then it will block. | |
1580 | */ | |
1581 | ||
40d4e3df | 1582 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1583 | |
1584 | /* | |
1ce4f28b | 1585 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1586 | * handles the blocking we don't see and worry about blocking |
1587 | * retries. | |
1588 | */ | |
1589 | ||
8ae55f04 | 1590 | if (skb == NULL) |
1da177e4 LT |
1591 | goto out; |
1592 | ||
bfd5f4a3 SS |
1593 | if (pkt_sk(sk)->has_vnet_hdr) { |
1594 | struct virtio_net_hdr vnet_hdr = { 0 }; | |
1595 | ||
1596 | err = -EINVAL; | |
1597 | vnet_hdr_len = sizeof(vnet_hdr); | |
1598 | if ((len -= vnet_hdr_len) < 0) | |
1599 | goto out_free; | |
1600 | ||
1601 | if (skb_is_gso(skb)) { | |
1602 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1603 | ||
1604 | /* This is a hint as to how much should be linear. */ | |
1605 | vnet_hdr.hdr_len = skb_headlen(skb); | |
1606 | vnet_hdr.gso_size = sinfo->gso_size; | |
1607 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1608 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1609 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1610 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
1611 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
1612 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
1613 | else if (sinfo->gso_type & SKB_GSO_FCOE) | |
1614 | goto out_free; | |
1615 | else | |
1616 | BUG(); | |
1617 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
1618 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1619 | } else | |
1620 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1621 | ||
1622 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1623 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
1624 | vnet_hdr.csum_start = skb->csum_start - | |
1625 | skb_headroom(skb); | |
1626 | vnet_hdr.csum_offset = skb->csum_offset; | |
1627 | } /* else everything is zero */ | |
1628 | ||
1629 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, | |
1630 | vnet_hdr_len); | |
1631 | if (err < 0) | |
1632 | goto out_free; | |
1633 | } | |
1634 | ||
0fb375fb EB |
1635 | /* |
1636 | * If the address length field is there to be filled in, we fill | |
1637 | * it in now. | |
1638 | */ | |
1639 | ||
ffbc6111 | 1640 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1641 | if (sock->type == SOCK_PACKET) |
1642 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1643 | else | |
1644 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1645 | ||
1da177e4 LT |
1646 | /* |
1647 | * You lose any data beyond the buffer you gave. If it worries a | |
1648 | * user program they can ask the device for its MTU anyway. | |
1649 | */ | |
1650 | ||
1651 | copied = skb->len; | |
40d4e3df ED |
1652 | if (copied > len) { |
1653 | copied = len; | |
1654 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
1655 | } |
1656 | ||
1657 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1658 | if (err) | |
1659 | goto out_free; | |
1660 | ||
3b885787 | 1661 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
1662 | |
1663 | if (msg->msg_name) | |
ffbc6111 HX |
1664 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1665 | msg->msg_namelen); | |
1da177e4 | 1666 | |
8dc41944 | 1667 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1668 | struct tpacket_auxdata aux; |
1669 | ||
1670 | aux.tp_status = TP_STATUS_USER; | |
1671 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1672 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1673 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1674 | aux.tp_snaplen = skb->len; | |
1675 | aux.tp_mac = 0; | |
bbe735e4 | 1676 | aux.tp_net = skb_network_offset(skb); |
05423b24 | 1677 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
ffbc6111 HX |
1678 | |
1679 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); | |
8dc41944 HX |
1680 | } |
1681 | ||
1da177e4 LT |
1682 | /* |
1683 | * Free or return the buffer as appropriate. Again this | |
1684 | * hides all the races and re-entrancy issues from us. | |
1685 | */ | |
bfd5f4a3 | 1686 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
1687 | |
1688 | out_free: | |
1689 | skb_free_datagram(sk, skb); | |
1690 | out: | |
1691 | return err; | |
1692 | } | |
1693 | ||
1da177e4 LT |
1694 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1695 | int *uaddr_len, int peer) | |
1696 | { | |
1697 | struct net_device *dev; | |
1698 | struct sock *sk = sock->sk; | |
1699 | ||
1700 | if (peer) | |
1701 | return -EOPNOTSUPP; | |
1702 | ||
1703 | uaddr->sa_family = AF_PACKET; | |
654d1f8a ED |
1704 | rcu_read_lock(); |
1705 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
1706 | if (dev) | |
1da177e4 | 1707 | strlcpy(uaddr->sa_data, dev->name, 15); |
654d1f8a | 1708 | else |
1da177e4 | 1709 | memset(uaddr->sa_data, 0, 14); |
654d1f8a | 1710 | rcu_read_unlock(); |
1da177e4 LT |
1711 | *uaddr_len = sizeof(*uaddr); |
1712 | ||
1713 | return 0; | |
1714 | } | |
1da177e4 LT |
1715 | |
1716 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1717 | int *uaddr_len, int peer) | |
1718 | { | |
1719 | struct net_device *dev; | |
1720 | struct sock *sk = sock->sk; | |
1721 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 1722 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
1723 | |
1724 | if (peer) | |
1725 | return -EOPNOTSUPP; | |
1726 | ||
1727 | sll->sll_family = AF_PACKET; | |
1728 | sll->sll_ifindex = po->ifindex; | |
1729 | sll->sll_protocol = po->num; | |
654d1f8a ED |
1730 | rcu_read_lock(); |
1731 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
1732 | if (dev) { |
1733 | sll->sll_hatype = dev->type; | |
1734 | sll->sll_halen = dev->addr_len; | |
1735 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
1736 | } else { |
1737 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1738 | sll->sll_halen = 0; | |
1739 | } | |
654d1f8a | 1740 | rcu_read_unlock(); |
0fb375fb | 1741 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1742 | |
1743 | return 0; | |
1744 | } | |
1745 | ||
2aeb0b88 WC |
1746 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
1747 | int what) | |
1da177e4 LT |
1748 | { |
1749 | switch (i->type) { | |
1750 | case PACKET_MR_MULTICAST: | |
1162563f JP |
1751 | if (i->alen != dev->addr_len) |
1752 | return -EINVAL; | |
1da177e4 | 1753 | if (what > 0) |
22bedad3 | 1754 | return dev_mc_add(dev, i->addr); |
1da177e4 | 1755 | else |
22bedad3 | 1756 | return dev_mc_del(dev, i->addr); |
1da177e4 LT |
1757 | break; |
1758 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 1759 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
1760 | break; |
1761 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 1762 | return dev_set_allmulti(dev, what); |
1da177e4 | 1763 | break; |
d95ed927 | 1764 | case PACKET_MR_UNICAST: |
1162563f JP |
1765 | if (i->alen != dev->addr_len) |
1766 | return -EINVAL; | |
d95ed927 | 1767 | if (what > 0) |
a748ee24 | 1768 | return dev_uc_add(dev, i->addr); |
d95ed927 | 1769 | else |
a748ee24 | 1770 | return dev_uc_del(dev, i->addr); |
d95ed927 | 1771 | break; |
40d4e3df ED |
1772 | default: |
1773 | break; | |
1da177e4 | 1774 | } |
2aeb0b88 | 1775 | return 0; |
1da177e4 LT |
1776 | } |
1777 | ||
1778 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1779 | { | |
40d4e3df | 1780 | for ( ; i; i = i->next) { |
1da177e4 LT |
1781 | if (i->ifindex == dev->ifindex) |
1782 | packet_dev_mc(dev, i, what); | |
1783 | } | |
1784 | } | |
1785 | ||
0fb375fb | 1786 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1787 | { |
1788 | struct packet_sock *po = pkt_sk(sk); | |
1789 | struct packet_mclist *ml, *i; | |
1790 | struct net_device *dev; | |
1791 | int err; | |
1792 | ||
1793 | rtnl_lock(); | |
1794 | ||
1795 | err = -ENODEV; | |
3b1e0a65 | 1796 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
1797 | if (!dev) |
1798 | goto done; | |
1799 | ||
1800 | err = -EINVAL; | |
1162563f | 1801 | if (mreq->mr_alen > dev->addr_len) |
1da177e4 LT |
1802 | goto done; |
1803 | ||
1804 | err = -ENOBUFS; | |
8b3a7005 | 1805 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1806 | if (i == NULL) |
1807 | goto done; | |
1808 | ||
1809 | err = 0; | |
1810 | for (ml = po->mclist; ml; ml = ml->next) { | |
1811 | if (ml->ifindex == mreq->mr_ifindex && | |
1812 | ml->type == mreq->mr_type && | |
1813 | ml->alen == mreq->mr_alen && | |
1814 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1815 | ml->count++; | |
1816 | /* Free the new element ... */ | |
1817 | kfree(i); | |
1818 | goto done; | |
1819 | } | |
1820 | } | |
1821 | ||
1822 | i->type = mreq->mr_type; | |
1823 | i->ifindex = mreq->mr_ifindex; | |
1824 | i->alen = mreq->mr_alen; | |
1825 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1826 | i->count = 1; | |
1827 | i->next = po->mclist; | |
1828 | po->mclist = i; | |
2aeb0b88 WC |
1829 | err = packet_dev_mc(dev, i, 1); |
1830 | if (err) { | |
1831 | po->mclist = i->next; | |
1832 | kfree(i); | |
1833 | } | |
1da177e4 LT |
1834 | |
1835 | done: | |
1836 | rtnl_unlock(); | |
1837 | return err; | |
1838 | } | |
1839 | ||
0fb375fb | 1840 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1841 | { |
1842 | struct packet_mclist *ml, **mlp; | |
1843 | ||
1844 | rtnl_lock(); | |
1845 | ||
1846 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1847 | if (ml->ifindex == mreq->mr_ifindex && | |
1848 | ml->type == mreq->mr_type && | |
1849 | ml->alen == mreq->mr_alen && | |
1850 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1851 | if (--ml->count == 0) { | |
1852 | struct net_device *dev; | |
1853 | *mlp = ml->next; | |
ad959e76 ED |
1854 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1855 | if (dev) | |
1da177e4 | 1856 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1857 | kfree(ml); |
1858 | } | |
1859 | rtnl_unlock(); | |
1860 | return 0; | |
1861 | } | |
1862 | } | |
1863 | rtnl_unlock(); | |
1864 | return -EADDRNOTAVAIL; | |
1865 | } | |
1866 | ||
1867 | static void packet_flush_mclist(struct sock *sk) | |
1868 | { | |
1869 | struct packet_sock *po = pkt_sk(sk); | |
1870 | struct packet_mclist *ml; | |
1871 | ||
1872 | if (!po->mclist) | |
1873 | return; | |
1874 | ||
1875 | rtnl_lock(); | |
1876 | while ((ml = po->mclist) != NULL) { | |
1877 | struct net_device *dev; | |
1878 | ||
1879 | po->mclist = ml->next; | |
ad959e76 ED |
1880 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1881 | if (dev != NULL) | |
1da177e4 | 1882 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1883 | kfree(ml); |
1884 | } | |
1885 | rtnl_unlock(); | |
1886 | } | |
1da177e4 LT |
1887 | |
1888 | static int | |
b7058842 | 1889 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1890 | { |
1891 | struct sock *sk = sock->sk; | |
8dc41944 | 1892 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1893 | int ret; |
1894 | ||
1895 | if (level != SOL_PACKET) | |
1896 | return -ENOPROTOOPT; | |
1897 | ||
69e3c75f | 1898 | switch (optname) { |
1ce4f28b | 1899 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
1900 | case PACKET_DROP_MEMBERSHIP: |
1901 | { | |
0fb375fb EB |
1902 | struct packet_mreq_max mreq; |
1903 | int len = optlen; | |
1904 | memset(&mreq, 0, sizeof(mreq)); | |
1905 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1906 | return -EINVAL; |
0fb375fb EB |
1907 | if (len > sizeof(mreq)) |
1908 | len = sizeof(mreq); | |
40d4e3df | 1909 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 1910 | return -EFAULT; |
0fb375fb EB |
1911 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1912 | return -EINVAL; | |
1da177e4 LT |
1913 | if (optname == PACKET_ADD_MEMBERSHIP) |
1914 | ret = packet_mc_add(sk, &mreq); | |
1915 | else | |
1916 | ret = packet_mc_drop(sk, &mreq); | |
1917 | return ret; | |
1918 | } | |
a2efcfa0 | 1919 | |
1da177e4 | 1920 | case PACKET_RX_RING: |
69e3c75f | 1921 | case PACKET_TX_RING: |
1da177e4 LT |
1922 | { |
1923 | struct tpacket_req req; | |
1924 | ||
40d4e3df | 1925 | if (optlen < sizeof(req)) |
1da177e4 | 1926 | return -EINVAL; |
bfd5f4a3 SS |
1927 | if (pkt_sk(sk)->has_vnet_hdr) |
1928 | return -EINVAL; | |
40d4e3df | 1929 | if (copy_from_user(&req, optval, sizeof(req))) |
1da177e4 | 1930 | return -EFAULT; |
69e3c75f | 1931 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1da177e4 LT |
1932 | } |
1933 | case PACKET_COPY_THRESH: | |
1934 | { | |
1935 | int val; | |
1936 | ||
40d4e3df | 1937 | if (optlen != sizeof(val)) |
1da177e4 | 1938 | return -EINVAL; |
40d4e3df | 1939 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
1940 | return -EFAULT; |
1941 | ||
1942 | pkt_sk(sk)->copy_thresh = val; | |
1943 | return 0; | |
1944 | } | |
bbd6ef87 PM |
1945 | case PACKET_VERSION: |
1946 | { | |
1947 | int val; | |
1948 | ||
1949 | if (optlen != sizeof(val)) | |
1950 | return -EINVAL; | |
69e3c75f | 1951 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
1952 | return -EBUSY; |
1953 | if (copy_from_user(&val, optval, sizeof(val))) | |
1954 | return -EFAULT; | |
1955 | switch (val) { | |
1956 | case TPACKET_V1: | |
1957 | case TPACKET_V2: | |
1958 | po->tp_version = val; | |
1959 | return 0; | |
1960 | default: | |
1961 | return -EINVAL; | |
1962 | } | |
1963 | } | |
8913336a PM |
1964 | case PACKET_RESERVE: |
1965 | { | |
1966 | unsigned int val; | |
1967 | ||
1968 | if (optlen != sizeof(val)) | |
1969 | return -EINVAL; | |
69e3c75f | 1970 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
1971 | return -EBUSY; |
1972 | if (copy_from_user(&val, optval, sizeof(val))) | |
1973 | return -EFAULT; | |
1974 | po->tp_reserve = val; | |
1975 | return 0; | |
1976 | } | |
69e3c75f JB |
1977 | case PACKET_LOSS: |
1978 | { | |
1979 | unsigned int val; | |
1980 | ||
1981 | if (optlen != sizeof(val)) | |
1982 | return -EINVAL; | |
1983 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
1984 | return -EBUSY; | |
1985 | if (copy_from_user(&val, optval, sizeof(val))) | |
1986 | return -EFAULT; | |
1987 | po->tp_loss = !!val; | |
1988 | return 0; | |
1989 | } | |
8dc41944 HX |
1990 | case PACKET_AUXDATA: |
1991 | { | |
1992 | int val; | |
1993 | ||
1994 | if (optlen < sizeof(val)) | |
1995 | return -EINVAL; | |
1996 | if (copy_from_user(&val, optval, sizeof(val))) | |
1997 | return -EFAULT; | |
1998 | ||
1999 | po->auxdata = !!val; | |
2000 | return 0; | |
2001 | } | |
80feaacb PWJ |
2002 | case PACKET_ORIGDEV: |
2003 | { | |
2004 | int val; | |
2005 | ||
2006 | if (optlen < sizeof(val)) | |
2007 | return -EINVAL; | |
2008 | if (copy_from_user(&val, optval, sizeof(val))) | |
2009 | return -EFAULT; | |
2010 | ||
2011 | po->origdev = !!val; | |
2012 | return 0; | |
2013 | } | |
bfd5f4a3 SS |
2014 | case PACKET_VNET_HDR: |
2015 | { | |
2016 | int val; | |
2017 | ||
2018 | if (sock->type != SOCK_RAW) | |
2019 | return -EINVAL; | |
2020 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2021 | return -EBUSY; | |
2022 | if (optlen < sizeof(val)) | |
2023 | return -EINVAL; | |
2024 | if (copy_from_user(&val, optval, sizeof(val))) | |
2025 | return -EFAULT; | |
2026 | ||
2027 | po->has_vnet_hdr = !!val; | |
2028 | return 0; | |
2029 | } | |
1da177e4 LT |
2030 | default: |
2031 | return -ENOPROTOOPT; | |
2032 | } | |
2033 | } | |
2034 | ||
2035 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
2036 | char __user *optval, int __user *optlen) | |
2037 | { | |
2038 | int len; | |
8dc41944 | 2039 | int val; |
1da177e4 LT |
2040 | struct sock *sk = sock->sk; |
2041 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
2042 | void *data; |
2043 | struct tpacket_stats st; | |
1da177e4 LT |
2044 | |
2045 | if (level != SOL_PACKET) | |
2046 | return -ENOPROTOOPT; | |
2047 | ||
8ae55f04 KK |
2048 | if (get_user(len, optlen)) |
2049 | return -EFAULT; | |
1da177e4 LT |
2050 | |
2051 | if (len < 0) | |
2052 | return -EINVAL; | |
1ce4f28b | 2053 | |
69e3c75f | 2054 | switch (optname) { |
1da177e4 | 2055 | case PACKET_STATISTICS: |
1da177e4 LT |
2056 | if (len > sizeof(struct tpacket_stats)) |
2057 | len = sizeof(struct tpacket_stats); | |
2058 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2059 | st = po->stats; | |
2060 | memset(&po->stats, 0, sizeof(st)); | |
2061 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2062 | st.tp_packets += st.tp_drops; | |
2063 | ||
8dc41944 HX |
2064 | data = &st; |
2065 | break; | |
2066 | case PACKET_AUXDATA: | |
2067 | if (len > sizeof(int)) | |
2068 | len = sizeof(int); | |
2069 | val = po->auxdata; | |
2070 | ||
80feaacb PWJ |
2071 | data = &val; |
2072 | break; | |
2073 | case PACKET_ORIGDEV: | |
2074 | if (len > sizeof(int)) | |
2075 | len = sizeof(int); | |
2076 | val = po->origdev; | |
2077 | ||
bfd5f4a3 SS |
2078 | data = &val; |
2079 | break; | |
2080 | case PACKET_VNET_HDR: | |
2081 | if (len > sizeof(int)) | |
2082 | len = sizeof(int); | |
2083 | val = po->has_vnet_hdr; | |
2084 | ||
8dc41944 | 2085 | data = &val; |
1da177e4 | 2086 | break; |
bbd6ef87 PM |
2087 | case PACKET_VERSION: |
2088 | if (len > sizeof(int)) | |
2089 | len = sizeof(int); | |
2090 | val = po->tp_version; | |
2091 | data = &val; | |
2092 | break; | |
2093 | case PACKET_HDRLEN: | |
2094 | if (len > sizeof(int)) | |
2095 | len = sizeof(int); | |
2096 | if (copy_from_user(&val, optval, len)) | |
2097 | return -EFAULT; | |
2098 | switch (val) { | |
2099 | case TPACKET_V1: | |
2100 | val = sizeof(struct tpacket_hdr); | |
2101 | break; | |
2102 | case TPACKET_V2: | |
2103 | val = sizeof(struct tpacket2_hdr); | |
2104 | break; | |
2105 | default: | |
2106 | return -EINVAL; | |
2107 | } | |
2108 | data = &val; | |
2109 | break; | |
8913336a PM |
2110 | case PACKET_RESERVE: |
2111 | if (len > sizeof(unsigned int)) | |
2112 | len = sizeof(unsigned int); | |
2113 | val = po->tp_reserve; | |
2114 | data = &val; | |
2115 | break; | |
69e3c75f JB |
2116 | case PACKET_LOSS: |
2117 | if (len > sizeof(unsigned int)) | |
2118 | len = sizeof(unsigned int); | |
2119 | val = po->tp_loss; | |
2120 | data = &val; | |
2121 | break; | |
1da177e4 LT |
2122 | default: |
2123 | return -ENOPROTOOPT; | |
2124 | } | |
2125 | ||
8ae55f04 KK |
2126 | if (put_user(len, optlen)) |
2127 | return -EFAULT; | |
8dc41944 HX |
2128 | if (copy_to_user(optval, data, len)) |
2129 | return -EFAULT; | |
8ae55f04 | 2130 | return 0; |
1da177e4 LT |
2131 | } |
2132 | ||
2133 | ||
2134 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
2135 | { | |
2136 | struct sock *sk; | |
2137 | struct hlist_node *node; | |
ad930650 | 2138 | struct net_device *dev = data; |
c346dca1 | 2139 | struct net *net = dev_net(dev); |
1da177e4 | 2140 | |
808f5114 | 2141 | rcu_read_lock(); |
2142 | sk_for_each_rcu(sk, node, &net->packet.sklist) { | |
1da177e4 LT |
2143 | struct packet_sock *po = pkt_sk(sk); |
2144 | ||
2145 | switch (msg) { | |
2146 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
2147 | if (po->mclist) |
2148 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
2149 | /* fallthrough */ |
2150 | ||
1da177e4 LT |
2151 | case NETDEV_DOWN: |
2152 | if (dev->ifindex == po->ifindex) { | |
2153 | spin_lock(&po->bind_lock); | |
2154 | if (po->running) { | |
2155 | __dev_remove_pack(&po->prot_hook); | |
2156 | __sock_put(sk); | |
2157 | po->running = 0; | |
2158 | sk->sk_err = ENETDOWN; | |
2159 | if (!sock_flag(sk, SOCK_DEAD)) | |
2160 | sk->sk_error_report(sk); | |
2161 | } | |
2162 | if (msg == NETDEV_UNREGISTER) { | |
2163 | po->ifindex = -1; | |
2164 | po->prot_hook.dev = NULL; | |
2165 | } | |
2166 | spin_unlock(&po->bind_lock); | |
2167 | } | |
2168 | break; | |
2169 | case NETDEV_UP: | |
808f5114 | 2170 | if (dev->ifindex == po->ifindex) { |
2171 | spin_lock(&po->bind_lock); | |
2172 | if (po->num && !po->running) { | |
2173 | dev_add_pack(&po->prot_hook); | |
2174 | sock_hold(sk); | |
2175 | po->running = 1; | |
2176 | } | |
2177 | spin_unlock(&po->bind_lock); | |
1da177e4 | 2178 | } |
1da177e4 LT |
2179 | break; |
2180 | } | |
2181 | } | |
808f5114 | 2182 | rcu_read_unlock(); |
1da177e4 LT |
2183 | return NOTIFY_DONE; |
2184 | } | |
2185 | ||
2186 | ||
2187 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
2188 | unsigned long arg) | |
2189 | { | |
2190 | struct sock *sk = sock->sk; | |
2191 | ||
69e3c75f | 2192 | switch (cmd) { |
40d4e3df ED |
2193 | case SIOCOUTQ: |
2194 | { | |
2195 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 2196 | |
40d4e3df ED |
2197 | return put_user(amount, (int __user *)arg); |
2198 | } | |
2199 | case SIOCINQ: | |
2200 | { | |
2201 | struct sk_buff *skb; | |
2202 | int amount = 0; | |
2203 | ||
2204 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2205 | skb = skb_peek(&sk->sk_receive_queue); | |
2206 | if (skb) | |
2207 | amount = skb->len; | |
2208 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2209 | return put_user(amount, (int __user *)arg); | |
2210 | } | |
2211 | case SIOCGSTAMP: | |
2212 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
2213 | case SIOCGSTAMPNS: | |
2214 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 2215 | |
1da177e4 | 2216 | #ifdef CONFIG_INET |
40d4e3df ED |
2217 | case SIOCADDRT: |
2218 | case SIOCDELRT: | |
2219 | case SIOCDARP: | |
2220 | case SIOCGARP: | |
2221 | case SIOCSARP: | |
2222 | case SIOCGIFADDR: | |
2223 | case SIOCSIFADDR: | |
2224 | case SIOCGIFBRDADDR: | |
2225 | case SIOCSIFBRDADDR: | |
2226 | case SIOCGIFNETMASK: | |
2227 | case SIOCSIFNETMASK: | |
2228 | case SIOCGIFDSTADDR: | |
2229 | case SIOCSIFDSTADDR: | |
2230 | case SIOCSIFFLAGS: | |
40d4e3df | 2231 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
1da177e4 LT |
2232 | #endif |
2233 | ||
40d4e3df ED |
2234 | default: |
2235 | return -ENOIOCTLCMD; | |
1da177e4 LT |
2236 | } |
2237 | return 0; | |
2238 | } | |
2239 | ||
40d4e3df | 2240 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
2241 | poll_table *wait) |
2242 | { | |
2243 | struct sock *sk = sock->sk; | |
2244 | struct packet_sock *po = pkt_sk(sk); | |
2245 | unsigned int mask = datagram_poll(file, sock, wait); | |
2246 | ||
2247 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2248 | if (po->rx_ring.pg_vec) { |
2249 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) | |
1da177e4 LT |
2250 | mask |= POLLIN | POLLRDNORM; |
2251 | } | |
2252 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2253 | spin_lock_bh(&sk->sk_write_queue.lock); |
2254 | if (po->tx_ring.pg_vec) { | |
2255 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
2256 | mask |= POLLOUT | POLLWRNORM; | |
2257 | } | |
2258 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
2259 | return mask; |
2260 | } | |
2261 | ||
2262 | ||
2263 | /* Dirty? Well, I still did not learn better way to account | |
2264 | * for user mmaps. | |
2265 | */ | |
2266 | ||
2267 | static void packet_mm_open(struct vm_area_struct *vma) | |
2268 | { | |
2269 | struct file *file = vma->vm_file; | |
40d4e3df | 2270 | struct socket *sock = file->private_data; |
1da177e4 | 2271 | struct sock *sk = sock->sk; |
1ce4f28b | 2272 | |
1da177e4 LT |
2273 | if (sk) |
2274 | atomic_inc(&pkt_sk(sk)->mapped); | |
2275 | } | |
2276 | ||
2277 | static void packet_mm_close(struct vm_area_struct *vma) | |
2278 | { | |
2279 | struct file *file = vma->vm_file; | |
40d4e3df | 2280 | struct socket *sock = file->private_data; |
1da177e4 | 2281 | struct sock *sk = sock->sk; |
1ce4f28b | 2282 | |
1da177e4 LT |
2283 | if (sk) |
2284 | atomic_dec(&pkt_sk(sk)->mapped); | |
2285 | } | |
2286 | ||
f0f37e2f | 2287 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
2288 | .open = packet_mm_open, |
2289 | .close = packet_mm_close, | |
1da177e4 LT |
2290 | }; |
2291 | ||
4ebf0ae2 | 2292 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
2293 | { |
2294 | int i; | |
2295 | ||
4ebf0ae2 DM |
2296 | for (i = 0; i < len; i++) { |
2297 | if (likely(pg_vec[i])) | |
2298 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
2299 | } |
2300 | kfree(pg_vec); | |
2301 | } | |
2302 | ||
4ebf0ae2 DM |
2303 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
2304 | { | |
719bfeaa ED |
2305 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN; |
2306 | ||
2307 | return (char *) __get_free_pages(gfp_flags, order); | |
4ebf0ae2 DM |
2308 | } |
2309 | ||
2310 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
2311 | { | |
2312 | unsigned int block_nr = req->tp_block_nr; | |
2313 | char **pg_vec; | |
2314 | int i; | |
2315 | ||
2316 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
2317 | if (unlikely(!pg_vec)) | |
2318 | goto out; | |
2319 | ||
2320 | for (i = 0; i < block_nr; i++) { | |
2321 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
2322 | if (unlikely(!pg_vec[i])) | |
2323 | goto out_free_pgvec; | |
2324 | } | |
2325 | ||
2326 | out: | |
2327 | return pg_vec; | |
2328 | ||
2329 | out_free_pgvec: | |
2330 | free_pg_vec(pg_vec, order, block_nr); | |
2331 | pg_vec = NULL; | |
2332 | goto out; | |
2333 | } | |
1da177e4 | 2334 | |
69e3c75f JB |
2335 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2336 | int closing, int tx_ring) | |
1da177e4 LT |
2337 | { |
2338 | char **pg_vec = NULL; | |
2339 | struct packet_sock *po = pkt_sk(sk); | |
0e11c91e | 2340 | int was_running, order = 0; |
69e3c75f JB |
2341 | struct packet_ring_buffer *rb; |
2342 | struct sk_buff_head *rb_queue; | |
0e11c91e | 2343 | __be16 num; |
69e3c75f | 2344 | int err; |
1ce4f28b | 2345 | |
69e3c75f JB |
2346 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2347 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 2348 | |
69e3c75f JB |
2349 | err = -EBUSY; |
2350 | if (!closing) { | |
2351 | if (atomic_read(&po->mapped)) | |
2352 | goto out; | |
2353 | if (atomic_read(&rb->pending)) | |
2354 | goto out; | |
2355 | } | |
1da177e4 | 2356 | |
69e3c75f JB |
2357 | if (req->tp_block_nr) { |
2358 | /* Sanity tests and some calculations */ | |
2359 | err = -EBUSY; | |
2360 | if (unlikely(rb->pg_vec)) | |
2361 | goto out; | |
1da177e4 | 2362 | |
bbd6ef87 PM |
2363 | switch (po->tp_version) { |
2364 | case TPACKET_V1: | |
2365 | po->tp_hdrlen = TPACKET_HDRLEN; | |
2366 | break; | |
2367 | case TPACKET_V2: | |
2368 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
2369 | break; | |
2370 | } | |
2371 | ||
69e3c75f | 2372 | err = -EINVAL; |
4ebf0ae2 | 2373 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 2374 | goto out; |
4ebf0ae2 | 2375 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 2376 | goto out; |
8913336a | 2377 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
2378 | po->tp_reserve)) |
2379 | goto out; | |
4ebf0ae2 | 2380 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 2381 | goto out; |
1da177e4 | 2382 | |
69e3c75f JB |
2383 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2384 | if (unlikely(rb->frames_per_block <= 0)) | |
2385 | goto out; | |
2386 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
2387 | req->tp_frame_nr)) | |
2388 | goto out; | |
1da177e4 LT |
2389 | |
2390 | err = -ENOMEM; | |
4ebf0ae2 DM |
2391 | order = get_order(req->tp_block_size); |
2392 | pg_vec = alloc_pg_vec(req, order); | |
2393 | if (unlikely(!pg_vec)) | |
1da177e4 | 2394 | goto out; |
69e3c75f JB |
2395 | } |
2396 | /* Done */ | |
2397 | else { | |
2398 | err = -EINVAL; | |
4ebf0ae2 | 2399 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 2400 | goto out; |
1da177e4 LT |
2401 | } |
2402 | ||
2403 | lock_sock(sk); | |
2404 | ||
2405 | /* Detach socket from network */ | |
2406 | spin_lock(&po->bind_lock); | |
2407 | was_running = po->running; | |
2408 | num = po->num; | |
2409 | if (was_running) { | |
2410 | __dev_remove_pack(&po->prot_hook); | |
2411 | po->num = 0; | |
2412 | po->running = 0; | |
2413 | __sock_put(sk); | |
2414 | } | |
2415 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 2416 | |
1da177e4 LT |
2417 | synchronize_net(); |
2418 | ||
2419 | err = -EBUSY; | |
905db440 | 2420 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
2421 | if (closing || atomic_read(&po->mapped) == 0) { |
2422 | err = 0; | |
2423 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
69e3c75f JB |
2424 | spin_lock_bh(&rb_queue->lock); |
2425 | pg_vec = XC(rb->pg_vec, pg_vec); | |
2426 | rb->frame_max = (req->tp_frame_nr - 1); | |
2427 | rb->head = 0; | |
2428 | rb->frame_size = req->tp_frame_size; | |
2429 | spin_unlock_bh(&rb_queue->lock); | |
2430 | ||
2431 | order = XC(rb->pg_vec_order, order); | |
2432 | req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr); | |
2433 | ||
2434 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
2435 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
2436 | tpacket_rcv : packet_rcv; | |
2437 | skb_queue_purge(rb_queue); | |
1da177e4 LT |
2438 | #undef XC |
2439 | if (atomic_read(&po->mapped)) | |
40d4e3df ED |
2440 | pr_err("packet_mmap: vma is busy: %d\n", |
2441 | atomic_read(&po->mapped)); | |
1da177e4 | 2442 | } |
905db440 | 2443 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2444 | |
2445 | spin_lock(&po->bind_lock); | |
2446 | if (was_running && !po->running) { | |
2447 | sock_hold(sk); | |
2448 | po->running = 1; | |
2449 | po->num = num; | |
2450 | dev_add_pack(&po->prot_hook); | |
2451 | } | |
2452 | spin_unlock(&po->bind_lock); | |
2453 | ||
2454 | release_sock(sk); | |
2455 | ||
1da177e4 LT |
2456 | if (pg_vec) |
2457 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
2458 | out: | |
2459 | return err; | |
2460 | } | |
2461 | ||
69e3c75f JB |
2462 | static int packet_mmap(struct file *file, struct socket *sock, |
2463 | struct vm_area_struct *vma) | |
1da177e4 LT |
2464 | { |
2465 | struct sock *sk = sock->sk; | |
2466 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
2467 | unsigned long size, expected_size; |
2468 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
2469 | unsigned long start; |
2470 | int err = -EINVAL; | |
2471 | int i; | |
2472 | ||
2473 | if (vma->vm_pgoff) | |
2474 | return -EINVAL; | |
2475 | ||
905db440 | 2476 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
2477 | |
2478 | expected_size = 0; | |
2479 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
2480 | if (rb->pg_vec) { | |
2481 | expected_size += rb->pg_vec_len | |
2482 | * rb->pg_vec_pages | |
2483 | * PAGE_SIZE; | |
2484 | } | |
2485 | } | |
2486 | ||
2487 | if (expected_size == 0) | |
1da177e4 | 2488 | goto out; |
69e3c75f JB |
2489 | |
2490 | size = vma->vm_end - vma->vm_start; | |
2491 | if (size != expected_size) | |
1da177e4 LT |
2492 | goto out; |
2493 | ||
1da177e4 | 2494 | start = vma->vm_start; |
69e3c75f JB |
2495 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2496 | if (rb->pg_vec == NULL) | |
2497 | continue; | |
2498 | ||
2499 | for (i = 0; i < rb->pg_vec_len; i++) { | |
2500 | struct page *page = virt_to_page(rb->pg_vec[i]); | |
2501 | int pg_num; | |
2502 | ||
2503 | for (pg_num = 0; pg_num < rb->pg_vec_pages; | |
40d4e3df | 2504 | pg_num++, page++) { |
69e3c75f JB |
2505 | err = vm_insert_page(vma, start, page); |
2506 | if (unlikely(err)) | |
2507 | goto out; | |
2508 | start += PAGE_SIZE; | |
2509 | } | |
4ebf0ae2 | 2510 | } |
1da177e4 | 2511 | } |
69e3c75f | 2512 | |
4ebf0ae2 | 2513 | atomic_inc(&po->mapped); |
1da177e4 LT |
2514 | vma->vm_ops = &packet_mmap_ops; |
2515 | err = 0; | |
2516 | ||
2517 | out: | |
905db440 | 2518 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2519 | return err; |
2520 | } | |
1da177e4 | 2521 | |
90ddc4f0 | 2522 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
2523 | .family = PF_PACKET, |
2524 | .owner = THIS_MODULE, | |
2525 | .release = packet_release, | |
2526 | .bind = packet_bind_spkt, | |
2527 | .connect = sock_no_connect, | |
2528 | .socketpair = sock_no_socketpair, | |
2529 | .accept = sock_no_accept, | |
2530 | .getname = packet_getname_spkt, | |
2531 | .poll = datagram_poll, | |
2532 | .ioctl = packet_ioctl, | |
2533 | .listen = sock_no_listen, | |
2534 | .shutdown = sock_no_shutdown, | |
2535 | .setsockopt = sock_no_setsockopt, | |
2536 | .getsockopt = sock_no_getsockopt, | |
2537 | .sendmsg = packet_sendmsg_spkt, | |
2538 | .recvmsg = packet_recvmsg, | |
2539 | .mmap = sock_no_mmap, | |
2540 | .sendpage = sock_no_sendpage, | |
2541 | }; | |
1da177e4 | 2542 | |
90ddc4f0 | 2543 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
2544 | .family = PF_PACKET, |
2545 | .owner = THIS_MODULE, | |
2546 | .release = packet_release, | |
2547 | .bind = packet_bind, | |
2548 | .connect = sock_no_connect, | |
2549 | .socketpair = sock_no_socketpair, | |
2550 | .accept = sock_no_accept, | |
1ce4f28b | 2551 | .getname = packet_getname, |
1da177e4 LT |
2552 | .poll = packet_poll, |
2553 | .ioctl = packet_ioctl, | |
2554 | .listen = sock_no_listen, | |
2555 | .shutdown = sock_no_shutdown, | |
2556 | .setsockopt = packet_setsockopt, | |
2557 | .getsockopt = packet_getsockopt, | |
2558 | .sendmsg = packet_sendmsg, | |
2559 | .recvmsg = packet_recvmsg, | |
2560 | .mmap = packet_mmap, | |
2561 | .sendpage = sock_no_sendpage, | |
2562 | }; | |
2563 | ||
ec1b4cf7 | 2564 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
2565 | .family = PF_PACKET, |
2566 | .create = packet_create, | |
2567 | .owner = THIS_MODULE, | |
2568 | }; | |
2569 | ||
2570 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 2571 | .notifier_call = packet_notifier, |
1da177e4 LT |
2572 | }; |
2573 | ||
2574 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
2575 | |
2576 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
808f5114 | 2577 | __acquires(RCU) |
1da177e4 | 2578 | { |
e372c414 | 2579 | struct net *net = seq_file_net(seq); |
808f5114 | 2580 | |
2581 | rcu_read_lock(); | |
2582 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); | |
1da177e4 LT |
2583 | } |
2584 | ||
2585 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2586 | { | |
1bf40954 | 2587 | struct net *net = seq_file_net(seq); |
808f5114 | 2588 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
1da177e4 LT |
2589 | } |
2590 | ||
2591 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
808f5114 | 2592 | __releases(RCU) |
1da177e4 | 2593 | { |
808f5114 | 2594 | rcu_read_unlock(); |
1da177e4 LT |
2595 | } |
2596 | ||
1ce4f28b | 2597 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
2598 | { |
2599 | if (v == SEQ_START_TOKEN) | |
2600 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
2601 | else { | |
b7ceabd9 | 2602 | struct sock *s = sk_entry(v); |
1da177e4 LT |
2603 | const struct packet_sock *po = pkt_sk(s); |
2604 | ||
2605 | seq_printf(seq, | |
2606 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
2607 | s, | |
2608 | atomic_read(&s->sk_refcnt), | |
2609 | s->sk_type, | |
2610 | ntohs(po->num), | |
2611 | po->ifindex, | |
2612 | po->running, | |
2613 | atomic_read(&s->sk_rmem_alloc), | |
2614 | sock_i_uid(s), | |
40d4e3df | 2615 | sock_i_ino(s)); |
1da177e4 LT |
2616 | } |
2617 | ||
2618 | return 0; | |
2619 | } | |
2620 | ||
56b3d975 | 2621 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
2622 | .start = packet_seq_start, |
2623 | .next = packet_seq_next, | |
2624 | .stop = packet_seq_stop, | |
2625 | .show = packet_seq_show, | |
2626 | }; | |
2627 | ||
2628 | static int packet_seq_open(struct inode *inode, struct file *file) | |
2629 | { | |
e372c414 DL |
2630 | return seq_open_net(inode, file, &packet_seq_ops, |
2631 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2632 | } |
2633 | ||
da7071d7 | 2634 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
2635 | .owner = THIS_MODULE, |
2636 | .open = packet_seq_open, | |
2637 | .read = seq_read, | |
2638 | .llseek = seq_lseek, | |
e372c414 | 2639 | .release = seq_release_net, |
1da177e4 LT |
2640 | }; |
2641 | ||
2642 | #endif | |
2643 | ||
2c8c1e72 | 2644 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 2645 | { |
808f5114 | 2646 | spin_lock_init(&net->packet.sklist_lock); |
2aaef4e4 | 2647 | INIT_HLIST_HEAD(&net->packet.sklist); |
d12d01d6 DL |
2648 | |
2649 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) | |
2650 | return -ENOMEM; | |
2651 | ||
2652 | return 0; | |
2653 | } | |
2654 | ||
2c8c1e72 | 2655 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 DL |
2656 | { |
2657 | proc_net_remove(net, "packet"); | |
2658 | } | |
2659 | ||
2660 | static struct pernet_operations packet_net_ops = { | |
2661 | .init = packet_net_init, | |
2662 | .exit = packet_net_exit, | |
2663 | }; | |
2664 | ||
2665 | ||
1da177e4 LT |
2666 | static void __exit packet_exit(void) |
2667 | { | |
1da177e4 | 2668 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 2669 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
2670 | sock_unregister(PF_PACKET); |
2671 | proto_unregister(&packet_proto); | |
2672 | } | |
2673 | ||
2674 | static int __init packet_init(void) | |
2675 | { | |
2676 | int rc = proto_register(&packet_proto, 0); | |
2677 | ||
2678 | if (rc != 0) | |
2679 | goto out; | |
2680 | ||
2681 | sock_register(&packet_family_ops); | |
d12d01d6 | 2682 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 2683 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
2684 | out: |
2685 | return rc; | |
2686 | } | |
2687 | ||
2688 | module_init(packet_init); | |
2689 | module_exit(packet_exit); | |
2690 | MODULE_LICENSE("GPL"); | |
2691 | MODULE_ALIAS_NETPROTO(PF_PACKET); |