Commit | Line | Data |
---|---|---|
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> |
614f60fa | 86 | #include <linux/net_tstamp.h> |
1da177e4 LT |
87 | |
88 | #ifdef CONFIG_INET | |
89 | #include <net/inet_common.h> | |
90 | #endif | |
91 | ||
1da177e4 LT |
92 | /* |
93 | Assumptions: | |
94 | - if device has no dev->hard_header routine, it adds and removes ll header | |
95 | inside itself. In this case ll header is invisible outside of device, | |
96 | but higher levels still should reserve dev->hard_header_len. | |
97 | Some devices are enough clever to reallocate skb, when header | |
98 | will not fit to reserved space (tunnel), another ones are silly | |
99 | (PPP). | |
100 | - packet socket receives packets with pulled ll header, | |
101 | so that SOCK_RAW should push it back. | |
102 | ||
103 | On receive: | |
104 | ----------- | |
105 | ||
106 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
107 | mac_header -> ll header |
108 | data -> data | |
1da177e4 LT |
109 | |
110 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
111 | mac_header -> ll header |
112 | data -> ll header | |
1da177e4 LT |
113 | |
114 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
115 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
116 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 117 | assymetry between rx and tx paths. |
b0e380b1 | 118 | data -> data |
1da177e4 LT |
119 | |
120 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
121 | mac_header -> data. ll header is still not built! |
122 | data -> data | |
1da177e4 LT |
123 | |
124 | Resume | |
125 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
126 | ||
127 | ||
128 | On transmit: | |
129 | ------------ | |
130 | ||
131 | dev->hard_header != NULL | |
b0e380b1 ACM |
132 | mac_header -> ll header |
133 | data -> ll header | |
1da177e4 LT |
134 | |
135 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
136 | mac_header -> data |
137 | data -> data | |
1da177e4 LT |
138 | |
139 | We should set nh.raw on output to correct posistion, | |
140 | packet classifier depends on it. | |
141 | */ | |
142 | ||
1da177e4 LT |
143 | /* Private packet socket structures. */ |
144 | ||
40d4e3df | 145 | struct packet_mclist { |
1da177e4 LT |
146 | struct packet_mclist *next; |
147 | int ifindex; | |
148 | int count; | |
149 | unsigned short type; | |
150 | unsigned short alen; | |
0fb375fb EB |
151 | unsigned char addr[MAX_ADDR_LEN]; |
152 | }; | |
153 | /* identical to struct packet_mreq except it has | |
154 | * a longer address field. | |
155 | */ | |
40d4e3df | 156 | struct packet_mreq_max { |
0fb375fb EB |
157 | int mr_ifindex; |
158 | unsigned short mr_type; | |
159 | unsigned short mr_alen; | |
160 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 161 | }; |
a2efcfa0 | 162 | |
69e3c75f JB |
163 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
164 | int closing, int tx_ring); | |
165 | ||
166 | struct packet_ring_buffer { | |
40d4e3df | 167 | char **pg_vec; |
69e3c75f JB |
168 | unsigned int head; |
169 | unsigned int frames_per_block; | |
170 | unsigned int frame_size; | |
171 | unsigned int frame_max; | |
172 | ||
173 | unsigned int pg_vec_order; | |
174 | unsigned int pg_vec_pages; | |
175 | unsigned int pg_vec_len; | |
176 | ||
177 | atomic_t pending; | |
178 | }; | |
179 | ||
180 | struct packet_sock; | |
181 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
1da177e4 LT |
182 | |
183 | static void packet_flush_mclist(struct sock *sk); | |
184 | ||
185 | struct packet_sock { | |
186 | /* struct sock has to be the first member of packet_sock */ | |
187 | struct sock sk; | |
188 | struct tpacket_stats stats; | |
69e3c75f JB |
189 | struct packet_ring_buffer rx_ring; |
190 | struct packet_ring_buffer tx_ring; | |
1da177e4 | 191 | int copy_thresh; |
1da177e4 | 192 | spinlock_t bind_lock; |
905db440 | 193 | struct mutex pg_vec_lock; |
8dc41944 | 194 | unsigned int running:1, /* prot_hook is attached*/ |
80feaacb | 195 | auxdata:1, |
bfd5f4a3 SS |
196 | origdev:1, |
197 | has_vnet_hdr:1; | |
1da177e4 | 198 | int ifindex; /* bound device */ |
0e11c91e | 199 | __be16 num; |
1da177e4 | 200 | struct packet_mclist *mclist; |
1da177e4 | 201 | atomic_t mapped; |
bbd6ef87 PM |
202 | enum tpacket_versions tp_version; |
203 | unsigned int tp_hdrlen; | |
8913336a | 204 | unsigned int tp_reserve; |
69e3c75f | 205 | unsigned int tp_loss:1; |
614f60fa | 206 | unsigned int tp_tstamp; |
94b05952 | 207 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
1da177e4 LT |
208 | }; |
209 | ||
ffbc6111 HX |
210 | struct packet_skb_cb { |
211 | unsigned int origlen; | |
212 | union { | |
213 | struct sockaddr_pkt pkt; | |
214 | struct sockaddr_ll ll; | |
215 | } sa; | |
216 | }; | |
217 | ||
218 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 219 | |
69e3c75f | 220 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 221 | { |
bbd6ef87 PM |
222 | union { |
223 | struct tpacket_hdr *h1; | |
224 | struct tpacket2_hdr *h2; | |
225 | void *raw; | |
226 | } h; | |
1da177e4 | 227 | |
69e3c75f | 228 | h.raw = frame; |
bbd6ef87 PM |
229 | switch (po->tp_version) { |
230 | case TPACKET_V1: | |
69e3c75f JB |
231 | h.h1->tp_status = status; |
232 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); | |
bbd6ef87 PM |
233 | break; |
234 | case TPACKET_V2: | |
69e3c75f JB |
235 | h.h2->tp_status = status; |
236 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); | |
bbd6ef87 | 237 | break; |
69e3c75f | 238 | default: |
40d4e3df | 239 | pr_err("TPACKET version not supported\n"); |
69e3c75f | 240 | BUG(); |
bbd6ef87 | 241 | } |
69e3c75f JB |
242 | |
243 | smp_wmb(); | |
bbd6ef87 PM |
244 | } |
245 | ||
69e3c75f | 246 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 PM |
247 | { |
248 | union { | |
249 | struct tpacket_hdr *h1; | |
250 | struct tpacket2_hdr *h2; | |
251 | void *raw; | |
252 | } h; | |
253 | ||
69e3c75f JB |
254 | smp_rmb(); |
255 | ||
bbd6ef87 PM |
256 | h.raw = frame; |
257 | switch (po->tp_version) { | |
258 | case TPACKET_V1: | |
69e3c75f JB |
259 | flush_dcache_page(virt_to_page(&h.h1->tp_status)); |
260 | return h.h1->tp_status; | |
bbd6ef87 | 261 | case TPACKET_V2: |
69e3c75f JB |
262 | flush_dcache_page(virt_to_page(&h.h2->tp_status)); |
263 | return h.h2->tp_status; | |
264 | default: | |
40d4e3df | 265 | pr_err("TPACKET version not supported\n"); |
69e3c75f JB |
266 | BUG(); |
267 | return 0; | |
bbd6ef87 | 268 | } |
1da177e4 | 269 | } |
69e3c75f JB |
270 | |
271 | static void *packet_lookup_frame(struct packet_sock *po, | |
272 | struct packet_ring_buffer *rb, | |
273 | unsigned int position, | |
274 | int status) | |
275 | { | |
276 | unsigned int pg_vec_pos, frame_offset; | |
277 | union { | |
278 | struct tpacket_hdr *h1; | |
279 | struct tpacket2_hdr *h2; | |
280 | void *raw; | |
281 | } h; | |
282 | ||
283 | pg_vec_pos = position / rb->frames_per_block; | |
284 | frame_offset = position % rb->frames_per_block; | |
285 | ||
286 | h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size); | |
287 | ||
288 | if (status != __packet_get_status(po, h.raw)) | |
289 | return NULL; | |
290 | ||
291 | return h.raw; | |
292 | } | |
293 | ||
294 | static inline void *packet_current_frame(struct packet_sock *po, | |
295 | struct packet_ring_buffer *rb, | |
296 | int status) | |
297 | { | |
298 | return packet_lookup_frame(po, rb, rb->head, status); | |
299 | } | |
300 | ||
301 | static inline void *packet_previous_frame(struct packet_sock *po, | |
302 | struct packet_ring_buffer *rb, | |
303 | int status) | |
304 | { | |
305 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
306 | return packet_lookup_frame(po, rb, previous, status); | |
307 | } | |
308 | ||
309 | static inline void packet_increment_head(struct packet_ring_buffer *buff) | |
310 | { | |
311 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
312 | } | |
313 | ||
1da177e4 LT |
314 | static inline struct packet_sock *pkt_sk(struct sock *sk) |
315 | { | |
316 | return (struct packet_sock *)sk; | |
317 | } | |
318 | ||
319 | static void packet_sock_destruct(struct sock *sk) | |
320 | { | |
ed85b565 RC |
321 | skb_queue_purge(&sk->sk_error_queue); |
322 | ||
547b792c IJ |
323 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
324 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
325 | |
326 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 327 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
328 | return; |
329 | } | |
330 | ||
17ab56a2 | 331 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
332 | } |
333 | ||
334 | ||
90ddc4f0 | 335 | static const struct proto_ops packet_ops; |
1da177e4 | 336 | |
90ddc4f0 | 337 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 338 | |
40d4e3df ED |
339 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
340 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
341 | { |
342 | struct sock *sk; | |
343 | struct sockaddr_pkt *spkt; | |
344 | ||
345 | /* | |
346 | * When we registered the protocol we saved the socket in the data | |
347 | * field for just this event. | |
348 | */ | |
349 | ||
350 | sk = pt->af_packet_priv; | |
1ce4f28b | 351 | |
1da177e4 LT |
352 | /* |
353 | * Yank back the headers [hope the device set this | |
354 | * right or kerboom...] | |
355 | * | |
356 | * Incoming packets have ll header pulled, | |
357 | * push it back. | |
358 | * | |
98e399f8 | 359 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
360 | * so that this procedure is noop. |
361 | */ | |
362 | ||
363 | if (skb->pkt_type == PACKET_LOOPBACK) | |
364 | goto out; | |
365 | ||
09ad9bc7 | 366 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
367 | goto out; |
368 | ||
40d4e3df ED |
369 | skb = skb_share_check(skb, GFP_ATOMIC); |
370 | if (skb == NULL) | |
1da177e4 LT |
371 | goto oom; |
372 | ||
373 | /* drop any routing info */ | |
adf30907 | 374 | skb_dst_drop(skb); |
1da177e4 | 375 | |
84531c24 PO |
376 | /* drop conntrack reference */ |
377 | nf_reset(skb); | |
378 | ||
ffbc6111 | 379 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 380 | |
98e399f8 | 381 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
382 | |
383 | /* | |
384 | * The SOCK_PACKET socket receives _all_ frames. | |
385 | */ | |
386 | ||
387 | spkt->spkt_family = dev->type; | |
388 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
389 | spkt->spkt_protocol = skb->protocol; | |
390 | ||
391 | /* | |
392 | * Charge the memory to the socket. This is done specifically | |
393 | * to prevent sockets using all the memory up. | |
394 | */ | |
395 | ||
40d4e3df | 396 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
397 | return 0; |
398 | ||
399 | out: | |
400 | kfree_skb(skb); | |
401 | oom: | |
402 | return 0; | |
403 | } | |
404 | ||
405 | ||
406 | /* | |
407 | * Output a raw packet to a device layer. This bypasses all the other | |
408 | * protocol layers and you must therefore supply it with a complete frame | |
409 | */ | |
1ce4f28b | 410 | |
1da177e4 LT |
411 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
412 | struct msghdr *msg, size_t len) | |
413 | { | |
414 | struct sock *sk = sock->sk; | |
40d4e3df | 415 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1a35ca80 | 416 | struct sk_buff *skb = NULL; |
1da177e4 | 417 | struct net_device *dev; |
40d4e3df | 418 | __be16 proto = 0; |
1da177e4 | 419 | int err; |
1ce4f28b | 420 | |
1da177e4 | 421 | /* |
1ce4f28b | 422 | * Get and verify the address. |
1da177e4 LT |
423 | */ |
424 | ||
40d4e3df | 425 | if (saddr) { |
1da177e4 | 426 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
427 | return -EINVAL; |
428 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
429 | proto = saddr->spkt_protocol; | |
430 | } else | |
431 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
432 | |
433 | /* | |
1ce4f28b | 434 | * Find the device first to size check it |
1da177e4 LT |
435 | */ |
436 | ||
437 | saddr->spkt_device[13] = 0; | |
1a35ca80 | 438 | retry: |
654d1f8a ED |
439 | rcu_read_lock(); |
440 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
441 | err = -ENODEV; |
442 | if (dev == NULL) | |
443 | goto out_unlock; | |
1ce4f28b | 444 | |
d5e76b0a DM |
445 | err = -ENETDOWN; |
446 | if (!(dev->flags & IFF_UP)) | |
447 | goto out_unlock; | |
448 | ||
1da177e4 | 449 | /* |
40d4e3df ED |
450 | * You may not queue a frame bigger than the mtu. This is the lowest level |
451 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 452 | */ |
1ce4f28b | 453 | |
1da177e4 | 454 | err = -EMSGSIZE; |
8ae55f04 | 455 | if (len > dev->mtu + dev->hard_header_len) |
1da177e4 LT |
456 | goto out_unlock; |
457 | ||
1a35ca80 ED |
458 | if (!skb) { |
459 | size_t reserved = LL_RESERVED_SPACE(dev); | |
460 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; | |
461 | ||
462 | rcu_read_unlock(); | |
463 | skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL); | |
464 | if (skb == NULL) | |
465 | return -ENOBUFS; | |
466 | /* FIXME: Save some space for broken drivers that write a hard | |
467 | * header at transmission time by themselves. PPP is the notable | |
468 | * one here. This should really be fixed at the driver level. | |
469 | */ | |
470 | skb_reserve(skb, reserved); | |
471 | skb_reset_network_header(skb); | |
472 | ||
473 | /* Try to align data part correctly */ | |
474 | if (hhlen) { | |
475 | skb->data -= hhlen; | |
476 | skb->tail -= hhlen; | |
477 | if (len < hhlen) | |
478 | skb_reset_network_header(skb); | |
479 | } | |
480 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
481 | if (err) | |
482 | goto out_free; | |
483 | goto retry; | |
1da177e4 LT |
484 | } |
485 | ||
1a35ca80 | 486 | |
1da177e4 LT |
487 | skb->protocol = proto; |
488 | skb->dev = dev; | |
489 | skb->priority = sk->sk_priority; | |
2d37a186 | 490 | skb->mark = sk->sk_mark; |
2244d07b | 491 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ed85b565 RC |
492 | if (err < 0) |
493 | goto out_unlock; | |
1da177e4 LT |
494 | |
495 | dev_queue_xmit(skb); | |
654d1f8a | 496 | rcu_read_unlock(); |
40d4e3df | 497 | return len; |
1da177e4 | 498 | |
1da177e4 | 499 | out_unlock: |
654d1f8a | 500 | rcu_read_unlock(); |
1a35ca80 ED |
501 | out_free: |
502 | kfree_skb(skb); | |
1da177e4 LT |
503 | return err; |
504 | } | |
1da177e4 | 505 | |
dbcb5855 DM |
506 | static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk, |
507 | unsigned int res) | |
1da177e4 LT |
508 | { |
509 | struct sk_filter *filter; | |
fda9ef5d DM |
510 | |
511 | rcu_read_lock_bh(); | |
a898def2 | 512 | filter = rcu_dereference_bh(sk->sk_filter); |
dbcb5855 DM |
513 | if (filter != NULL) |
514 | res = sk_run_filter(skb, filter->insns, filter->len); | |
fda9ef5d | 515 | rcu_read_unlock_bh(); |
1da177e4 | 516 | |
dbcb5855 | 517 | return res; |
1da177e4 LT |
518 | } |
519 | ||
520 | /* | |
521 | This function makes lazy skb cloning in hope that most of packets | |
522 | are discarded by BPF. | |
523 | ||
524 | Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
525 | and skb->cb are mangled. It works because (and until) packets | |
526 | falling here are owned by current CPU. Output packets are cloned | |
527 | by dev_queue_xmit_nit(), input packets are processed by net_bh | |
528 | sequencially, so that if we return skb to original state on exit, | |
529 | we will not harm anyone. | |
530 | */ | |
531 | ||
40d4e3df ED |
532 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
533 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
534 | { |
535 | struct sock *sk; | |
536 | struct sockaddr_ll *sll; | |
537 | struct packet_sock *po; | |
40d4e3df | 538 | u8 *skb_head = skb->data; |
1da177e4 | 539 | int skb_len = skb->len; |
dbcb5855 | 540 | unsigned int snaplen, res; |
1da177e4 LT |
541 | |
542 | if (skb->pkt_type == PACKET_LOOPBACK) | |
543 | goto drop; | |
544 | ||
545 | sk = pt->af_packet_priv; | |
546 | po = pkt_sk(sk); | |
547 | ||
09ad9bc7 | 548 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
549 | goto drop; |
550 | ||
1da177e4 LT |
551 | skb->dev = dev; |
552 | ||
3b04ddde | 553 | if (dev->header_ops) { |
1da177e4 LT |
554 | /* The device has an explicit notion of ll header, |
555 | exported to higher levels. | |
556 | ||
557 | Otherwise, the device hides datails of it frame | |
558 | structure, so that corresponding packet head | |
559 | never delivered to user. | |
560 | */ | |
561 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 562 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
563 | else if (skb->pkt_type == PACKET_OUTGOING) { |
564 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 565 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
566 | } |
567 | } | |
568 | ||
569 | snaplen = skb->len; | |
570 | ||
dbcb5855 DM |
571 | res = run_filter(skb, sk, snaplen); |
572 | if (!res) | |
fda9ef5d | 573 | goto drop_n_restore; |
dbcb5855 DM |
574 | if (snaplen > res) |
575 | snaplen = res; | |
1da177e4 LT |
576 | |
577 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
578 | (unsigned)sk->sk_rcvbuf) | |
579 | goto drop_n_acct; | |
580 | ||
581 | if (skb_shared(skb)) { | |
582 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
583 | if (nskb == NULL) | |
584 | goto drop_n_acct; | |
585 | ||
586 | if (skb_head != skb->data) { | |
587 | skb->data = skb_head; | |
588 | skb->len = skb_len; | |
589 | } | |
590 | kfree_skb(skb); | |
591 | skb = nskb; | |
592 | } | |
593 | ||
ffbc6111 HX |
594 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
595 | sizeof(skb->cb)); | |
596 | ||
597 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
598 | sll->sll_family = AF_PACKET; |
599 | sll->sll_hatype = dev->type; | |
600 | sll->sll_protocol = skb->protocol; | |
601 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 602 | if (unlikely(po->origdev)) |
80feaacb PWJ |
603 | sll->sll_ifindex = orig_dev->ifindex; |
604 | else | |
605 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 606 | |
b95cce35 | 607 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 608 | |
ffbc6111 | 609 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 610 | |
1da177e4 LT |
611 | if (pskb_trim(skb, snaplen)) |
612 | goto drop_n_acct; | |
613 | ||
614 | skb_set_owner_r(skb, sk); | |
615 | skb->dev = NULL; | |
adf30907 | 616 | skb_dst_drop(skb); |
1da177e4 | 617 | |
84531c24 PO |
618 | /* drop conntrack reference */ |
619 | nf_reset(skb); | |
620 | ||
1da177e4 LT |
621 | spin_lock(&sk->sk_receive_queue.lock); |
622 | po->stats.tp_packets++; | |
3b885787 | 623 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
624 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
625 | spin_unlock(&sk->sk_receive_queue.lock); | |
626 | sk->sk_data_ready(sk, skb->len); | |
627 | return 0; | |
628 | ||
629 | drop_n_acct: | |
3b885787 | 630 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
1da177e4 LT |
631 | |
632 | drop_n_restore: | |
633 | if (skb_head != skb->data && skb_shared(skb)) { | |
634 | skb->data = skb_head; | |
635 | skb->len = skb_len; | |
636 | } | |
637 | drop: | |
ead2ceb0 | 638 | consume_skb(skb); |
1da177e4 LT |
639 | return 0; |
640 | } | |
641 | ||
40d4e3df ED |
642 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
643 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
644 | { |
645 | struct sock *sk; | |
646 | struct packet_sock *po; | |
647 | struct sockaddr_ll *sll; | |
bbd6ef87 PM |
648 | union { |
649 | struct tpacket_hdr *h1; | |
650 | struct tpacket2_hdr *h2; | |
651 | void *raw; | |
652 | } h; | |
40d4e3df | 653 | u8 *skb_head = skb->data; |
1da177e4 | 654 | int skb_len = skb->len; |
dbcb5855 | 655 | unsigned int snaplen, res; |
1da177e4 | 656 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
bbd6ef87 | 657 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 658 | struct sk_buff *copy_skb = NULL; |
b7aa0bf7 | 659 | struct timeval tv; |
bbd6ef87 | 660 | struct timespec ts; |
614f60fa | 661 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
1da177e4 LT |
662 | |
663 | if (skb->pkt_type == PACKET_LOOPBACK) | |
664 | goto drop; | |
665 | ||
666 | sk = pt->af_packet_priv; | |
667 | po = pkt_sk(sk); | |
668 | ||
09ad9bc7 | 669 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
670 | goto drop; |
671 | ||
3b04ddde | 672 | if (dev->header_ops) { |
1da177e4 | 673 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 674 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
675 | else if (skb->pkt_type == PACKET_OUTGOING) { |
676 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 677 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
678 | } |
679 | } | |
680 | ||
8dc41944 HX |
681 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
682 | status |= TP_STATUS_CSUMNOTREADY; | |
683 | ||
1da177e4 LT |
684 | snaplen = skb->len; |
685 | ||
dbcb5855 DM |
686 | res = run_filter(skb, sk, snaplen); |
687 | if (!res) | |
fda9ef5d | 688 | goto drop_n_restore; |
dbcb5855 DM |
689 | if (snaplen > res) |
690 | snaplen = res; | |
1da177e4 LT |
691 | |
692 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
693 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
694 | po->tp_reserve; | |
1da177e4 | 695 | } else { |
bbe735e4 | 696 | unsigned maclen = skb_network_offset(skb); |
bbd6ef87 | 697 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
698 | (maclen < 16 ? 16 : maclen)) + |
699 | po->tp_reserve; | |
1da177e4 LT |
700 | macoff = netoff - maclen; |
701 | } | |
702 | ||
69e3c75f | 703 | if (macoff + snaplen > po->rx_ring.frame_size) { |
1da177e4 LT |
704 | if (po->copy_thresh && |
705 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
706 | (unsigned)sk->sk_rcvbuf) { | |
707 | if (skb_shared(skb)) { | |
708 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
709 | } else { | |
710 | copy_skb = skb_get(skb); | |
711 | skb_head = skb->data; | |
712 | } | |
713 | if (copy_skb) | |
714 | skb_set_owner_r(copy_skb, sk); | |
715 | } | |
69e3c75f | 716 | snaplen = po->rx_ring.frame_size - macoff; |
1da177e4 LT |
717 | if ((int)snaplen < 0) |
718 | snaplen = 0; | |
719 | } | |
1da177e4 LT |
720 | |
721 | spin_lock(&sk->sk_receive_queue.lock); | |
69e3c75f | 722 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
bbd6ef87 | 723 | if (!h.raw) |
1da177e4 | 724 | goto ring_is_full; |
69e3c75f | 725 | packet_increment_head(&po->rx_ring); |
1da177e4 LT |
726 | po->stats.tp_packets++; |
727 | if (copy_skb) { | |
728 | status |= TP_STATUS_COPY; | |
729 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
730 | } | |
731 | if (!po->stats.tp_drops) | |
732 | status &= ~TP_STATUS_LOSING; | |
733 | spin_unlock(&sk->sk_receive_queue.lock); | |
734 | ||
bbd6ef87 | 735 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
1da177e4 | 736 | |
bbd6ef87 PM |
737 | switch (po->tp_version) { |
738 | case TPACKET_V1: | |
739 | h.h1->tp_len = skb->len; | |
740 | h.h1->tp_snaplen = snaplen; | |
741 | h.h1->tp_mac = macoff; | |
742 | h.h1->tp_net = netoff; | |
614f60fa SM |
743 | if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
744 | && shhwtstamps->syststamp.tv64) | |
745 | tv = ktime_to_timeval(shhwtstamps->syststamp); | |
746 | else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) | |
747 | && shhwtstamps->hwtstamp.tv64) | |
748 | tv = ktime_to_timeval(shhwtstamps->hwtstamp); | |
749 | else if (skb->tstamp.tv64) | |
bbd6ef87 PM |
750 | tv = ktime_to_timeval(skb->tstamp); |
751 | else | |
752 | do_gettimeofday(&tv); | |
753 | h.h1->tp_sec = tv.tv_sec; | |
754 | h.h1->tp_usec = tv.tv_usec; | |
755 | hdrlen = sizeof(*h.h1); | |
756 | break; | |
757 | case TPACKET_V2: | |
758 | h.h2->tp_len = skb->len; | |
759 | h.h2->tp_snaplen = snaplen; | |
760 | h.h2->tp_mac = macoff; | |
761 | h.h2->tp_net = netoff; | |
614f60fa SM |
762 | if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
763 | && shhwtstamps->syststamp.tv64) | |
764 | ts = ktime_to_timespec(shhwtstamps->syststamp); | |
765 | else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) | |
766 | && shhwtstamps->hwtstamp.tv64) | |
767 | ts = ktime_to_timespec(shhwtstamps->hwtstamp); | |
768 | else if (skb->tstamp.tv64) | |
bbd6ef87 PM |
769 | ts = ktime_to_timespec(skb->tstamp); |
770 | else | |
771 | getnstimeofday(&ts); | |
772 | h.h2->tp_sec = ts.tv_sec; | |
773 | h.h2->tp_nsec = ts.tv_nsec; | |
05423b24 | 774 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
bbd6ef87 PM |
775 | hdrlen = sizeof(*h.h2); |
776 | break; | |
777 | default: | |
778 | BUG(); | |
779 | } | |
1da177e4 | 780 | |
bbd6ef87 | 781 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 782 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
783 | sll->sll_family = AF_PACKET; |
784 | sll->sll_hatype = dev->type; | |
785 | sll->sll_protocol = skb->protocol; | |
786 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 787 | if (unlikely(po->origdev)) |
80feaacb PWJ |
788 | sll->sll_ifindex = orig_dev->ifindex; |
789 | else | |
790 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 791 | |
bbd6ef87 | 792 | __packet_set_status(po, h.raw, status); |
e16aa207 | 793 | smp_mb(); |
1da177e4 LT |
794 | { |
795 | struct page *p_start, *p_end; | |
bbd6ef87 | 796 | u8 *h_end = h.raw + macoff + snaplen - 1; |
1da177e4 | 797 | |
bbd6ef87 | 798 | p_start = virt_to_page(h.raw); |
1da177e4 LT |
799 | p_end = virt_to_page(h_end); |
800 | while (p_start <= p_end) { | |
801 | flush_dcache_page(p_start); | |
802 | p_start++; | |
803 | } | |
804 | } | |
805 | ||
806 | sk->sk_data_ready(sk, 0); | |
807 | ||
808 | drop_n_restore: | |
809 | if (skb_head != skb->data && skb_shared(skb)) { | |
810 | skb->data = skb_head; | |
811 | skb->len = skb_len; | |
812 | } | |
813 | drop: | |
1ce4f28b | 814 | kfree_skb(skb); |
1da177e4 LT |
815 | return 0; |
816 | ||
817 | ring_is_full: | |
818 | po->stats.tp_drops++; | |
819 | spin_unlock(&sk->sk_receive_queue.lock); | |
820 | ||
821 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 822 | kfree_skb(copy_skb); |
1da177e4 LT |
823 | goto drop_n_restore; |
824 | } | |
825 | ||
69e3c75f JB |
826 | static void tpacket_destruct_skb(struct sk_buff *skb) |
827 | { | |
828 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 829 | void *ph; |
1da177e4 | 830 | |
69e3c75f | 831 | BUG_ON(skb == NULL); |
1da177e4 | 832 | |
69e3c75f JB |
833 | if (likely(po->tx_ring.pg_vec)) { |
834 | ph = skb_shinfo(skb)->destructor_arg; | |
835 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); | |
836 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); | |
837 | atomic_dec(&po->tx_ring.pending); | |
838 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); | |
839 | } | |
840 | ||
841 | sock_wfree(skb); | |
842 | } | |
843 | ||
40d4e3df ED |
844 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
845 | void *frame, struct net_device *dev, int size_max, | |
846 | __be16 proto, unsigned char *addr) | |
69e3c75f JB |
847 | { |
848 | union { | |
849 | struct tpacket_hdr *h1; | |
850 | struct tpacket2_hdr *h2; | |
851 | void *raw; | |
852 | } ph; | |
853 | int to_write, offset, len, tp_len, nr_frags, len_max; | |
854 | struct socket *sock = po->sk.sk_socket; | |
855 | struct page *page; | |
856 | void *data; | |
857 | int err; | |
858 | ||
859 | ph.raw = frame; | |
860 | ||
861 | skb->protocol = proto; | |
862 | skb->dev = dev; | |
863 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 864 | skb->mark = po->sk.sk_mark; |
69e3c75f JB |
865 | skb_shinfo(skb)->destructor_arg = ph.raw; |
866 | ||
867 | switch (po->tp_version) { | |
868 | case TPACKET_V2: | |
869 | tp_len = ph.h2->tp_len; | |
870 | break; | |
871 | default: | |
872 | tp_len = ph.h1->tp_len; | |
873 | break; | |
874 | } | |
875 | if (unlikely(tp_len > size_max)) { | |
40d4e3df | 876 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
69e3c75f JB |
877 | return -EMSGSIZE; |
878 | } | |
879 | ||
880 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
881 | skb_reset_network_header(skb); | |
882 | ||
883 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
884 | to_write = tp_len; | |
885 | ||
886 | if (sock->type == SOCK_DGRAM) { | |
887 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
888 | NULL, tp_len); | |
889 | if (unlikely(err < 0)) | |
890 | return -EINVAL; | |
40d4e3df | 891 | } else if (dev->hard_header_len) { |
69e3c75f JB |
892 | /* net device doesn't like empty head */ |
893 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
894 | pr_err("packet size is too short (%d < %d)\n", |
895 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
896 | return -EINVAL; |
897 | } | |
898 | ||
899 | skb_push(skb, dev->hard_header_len); | |
900 | err = skb_store_bits(skb, 0, data, | |
901 | dev->hard_header_len); | |
902 | if (unlikely(err)) | |
903 | return err; | |
904 | ||
905 | data += dev->hard_header_len; | |
906 | to_write -= dev->hard_header_len; | |
907 | } | |
908 | ||
909 | err = -EFAULT; | |
910 | page = virt_to_page(data); | |
911 | offset = offset_in_page(data); | |
912 | len_max = PAGE_SIZE - offset; | |
913 | len = ((to_write > len_max) ? len_max : to_write); | |
914 | ||
915 | skb->data_len = to_write; | |
916 | skb->len += to_write; | |
917 | skb->truesize += to_write; | |
918 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
919 | ||
920 | while (likely(to_write)) { | |
921 | nr_frags = skb_shinfo(skb)->nr_frags; | |
922 | ||
923 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
924 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
925 | MAX_SKB_FRAGS); | |
69e3c75f JB |
926 | return -EFAULT; |
927 | } | |
928 | ||
929 | flush_dcache_page(page); | |
930 | get_page(page); | |
931 | skb_fill_page_desc(skb, | |
932 | nr_frags, | |
933 | page++, offset, len); | |
934 | to_write -= len; | |
935 | offset = 0; | |
936 | len_max = PAGE_SIZE; | |
937 | len = ((to_write > len_max) ? len_max : to_write); | |
938 | } | |
939 | ||
940 | return tp_len; | |
941 | } | |
942 | ||
943 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
944 | { | |
945 | struct socket *sock; | |
946 | struct sk_buff *skb; | |
947 | struct net_device *dev; | |
948 | __be16 proto; | |
949 | int ifindex, err, reserve = 0; | |
40d4e3df ED |
950 | void *ph; |
951 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
952 | int tp_len, size_max; |
953 | unsigned char *addr; | |
954 | int len_sum = 0; | |
955 | int status = 0; | |
956 | ||
957 | sock = po->sk.sk_socket; | |
958 | ||
959 | mutex_lock(&po->pg_vec_lock); | |
960 | ||
961 | err = -EBUSY; | |
962 | if (saddr == NULL) { | |
963 | ifindex = po->ifindex; | |
964 | proto = po->num; | |
965 | addr = NULL; | |
966 | } else { | |
967 | err = -EINVAL; | |
968 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
969 | goto out; | |
970 | if (msg->msg_namelen < (saddr->sll_halen | |
971 | + offsetof(struct sockaddr_ll, | |
972 | sll_addr))) | |
973 | goto out; | |
974 | ifindex = saddr->sll_ifindex; | |
975 | proto = saddr->sll_protocol; | |
976 | addr = saddr->sll_addr; | |
977 | } | |
978 | ||
979 | dev = dev_get_by_index(sock_net(&po->sk), ifindex); | |
980 | err = -ENXIO; | |
981 | if (unlikely(dev == NULL)) | |
982 | goto out; | |
983 | ||
984 | reserve = dev->hard_header_len; | |
985 | ||
986 | err = -ENETDOWN; | |
987 | if (unlikely(!(dev->flags & IFF_UP))) | |
988 | goto out_put; | |
989 | ||
990 | size_max = po->tx_ring.frame_size | |
b5dd884e | 991 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f JB |
992 | |
993 | if (size_max > dev->mtu + reserve) | |
994 | size_max = dev->mtu + reserve; | |
995 | ||
996 | do { | |
997 | ph = packet_current_frame(po, &po->tx_ring, | |
998 | TP_STATUS_SEND_REQUEST); | |
999 | ||
1000 | if (unlikely(ph == NULL)) { | |
1001 | schedule(); | |
1002 | continue; | |
1003 | } | |
1004 | ||
1005 | status = TP_STATUS_SEND_REQUEST; | |
1006 | skb = sock_alloc_send_skb(&po->sk, | |
1007 | LL_ALLOCATED_SPACE(dev) | |
1008 | + sizeof(struct sockaddr_ll), | |
1009 | 0, &err); | |
1010 | ||
1011 | if (unlikely(skb == NULL)) | |
1012 | goto out_status; | |
1013 | ||
1014 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
1015 | addr); | |
1016 | ||
1017 | if (unlikely(tp_len < 0)) { | |
1018 | if (po->tp_loss) { | |
1019 | __packet_set_status(po, ph, | |
1020 | TP_STATUS_AVAILABLE); | |
1021 | packet_increment_head(&po->tx_ring); | |
1022 | kfree_skb(skb); | |
1023 | continue; | |
1024 | } else { | |
1025 | status = TP_STATUS_WRONG_FORMAT; | |
1026 | err = tp_len; | |
1027 | goto out_status; | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | skb->destructor = tpacket_destruct_skb; | |
1032 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
1033 | atomic_inc(&po->tx_ring.pending); | |
1034 | ||
1035 | status = TP_STATUS_SEND_REQUEST; | |
1036 | err = dev_queue_xmit(skb); | |
eb70df13 JP |
1037 | if (unlikely(err > 0)) { |
1038 | err = net_xmit_errno(err); | |
1039 | if (err && __packet_get_status(po, ph) == | |
1040 | TP_STATUS_AVAILABLE) { | |
1041 | /* skb was destructed already */ | |
1042 | skb = NULL; | |
1043 | goto out_status; | |
1044 | } | |
1045 | /* | |
1046 | * skb was dropped but not destructed yet; | |
1047 | * let's treat it like congestion or err < 0 | |
1048 | */ | |
1049 | err = 0; | |
1050 | } | |
69e3c75f JB |
1051 | packet_increment_head(&po->tx_ring); |
1052 | len_sum += tp_len; | |
f64f9e71 JP |
1053 | } while (likely((ph != NULL) || |
1054 | ((!(msg->msg_flags & MSG_DONTWAIT)) && | |
1055 | (atomic_read(&po->tx_ring.pending)))) | |
1056 | ); | |
69e3c75f JB |
1057 | |
1058 | err = len_sum; | |
1059 | goto out_put; | |
1060 | ||
69e3c75f JB |
1061 | out_status: |
1062 | __packet_set_status(po, ph, status); | |
1063 | kfree_skb(skb); | |
1064 | out_put: | |
1065 | dev_put(dev); | |
1066 | out: | |
1067 | mutex_unlock(&po->pg_vec_lock); | |
1068 | return err; | |
1069 | } | |
69e3c75f | 1070 | |
bfd5f4a3 SS |
1071 | static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
1072 | size_t reserve, size_t len, | |
1073 | size_t linear, int noblock, | |
1074 | int *err) | |
1075 | { | |
1076 | struct sk_buff *skb; | |
1077 | ||
1078 | /* Under a page? Don't bother with paged skb. */ | |
1079 | if (prepad + len < PAGE_SIZE || !linear) | |
1080 | linear = len; | |
1081 | ||
1082 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
1083 | err); | |
1084 | if (!skb) | |
1085 | return NULL; | |
1086 | ||
1087 | skb_reserve(skb, reserve); | |
1088 | skb_put(skb, linear); | |
1089 | skb->data_len = len - linear; | |
1090 | skb->len += len - linear; | |
1091 | ||
1092 | return skb; | |
1093 | } | |
1094 | ||
69e3c75f | 1095 | static int packet_snd(struct socket *sock, |
1da177e4 LT |
1096 | struct msghdr *msg, size_t len) |
1097 | { | |
1098 | struct sock *sk = sock->sk; | |
40d4e3df | 1099 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
1100 | struct sk_buff *skb; |
1101 | struct net_device *dev; | |
0e11c91e | 1102 | __be16 proto; |
1da177e4 LT |
1103 | unsigned char *addr; |
1104 | int ifindex, err, reserve = 0; | |
bfd5f4a3 SS |
1105 | struct virtio_net_hdr vnet_hdr = { 0 }; |
1106 | int offset = 0; | |
1107 | int vnet_hdr_len; | |
1108 | struct packet_sock *po = pkt_sk(sk); | |
1109 | unsigned short gso_type = 0; | |
1da177e4 LT |
1110 | |
1111 | /* | |
1ce4f28b | 1112 | * Get and verify the address. |
1da177e4 | 1113 | */ |
1ce4f28b | 1114 | |
1da177e4 | 1115 | if (saddr == NULL) { |
1da177e4 LT |
1116 | ifindex = po->ifindex; |
1117 | proto = po->num; | |
1118 | addr = NULL; | |
1119 | } else { | |
1120 | err = -EINVAL; | |
1121 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1122 | goto out; | |
0fb375fb EB |
1123 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1124 | goto out; | |
1da177e4 LT |
1125 | ifindex = saddr->sll_ifindex; |
1126 | proto = saddr->sll_protocol; | |
1127 | addr = saddr->sll_addr; | |
1128 | } | |
1129 | ||
1130 | ||
3b1e0a65 | 1131 | dev = dev_get_by_index(sock_net(sk), ifindex); |
1da177e4 LT |
1132 | err = -ENXIO; |
1133 | if (dev == NULL) | |
1134 | goto out_unlock; | |
1135 | if (sock->type == SOCK_RAW) | |
1136 | reserve = dev->hard_header_len; | |
1137 | ||
d5e76b0a DM |
1138 | err = -ENETDOWN; |
1139 | if (!(dev->flags & IFF_UP)) | |
1140 | goto out_unlock; | |
1141 | ||
bfd5f4a3 SS |
1142 | if (po->has_vnet_hdr) { |
1143 | vnet_hdr_len = sizeof(vnet_hdr); | |
1144 | ||
1145 | err = -EINVAL; | |
1146 | if (len < vnet_hdr_len) | |
1147 | goto out_unlock; | |
1148 | ||
1149 | len -= vnet_hdr_len; | |
1150 | ||
1151 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, | |
1152 | vnet_hdr_len); | |
1153 | if (err < 0) | |
1154 | goto out_unlock; | |
1155 | ||
1156 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
1157 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
1158 | vnet_hdr.hdr_len)) | |
1159 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
1160 | vnet_hdr.csum_offset + 2; | |
1161 | ||
1162 | err = -EINVAL; | |
1163 | if (vnet_hdr.hdr_len > len) | |
1164 | goto out_unlock; | |
1165 | ||
1166 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
1167 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1168 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
1169 | gso_type = SKB_GSO_TCPV4; | |
1170 | break; | |
1171 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
1172 | gso_type = SKB_GSO_TCPV6; | |
1173 | break; | |
1174 | case VIRTIO_NET_HDR_GSO_UDP: | |
1175 | gso_type = SKB_GSO_UDP; | |
1176 | break; | |
1177 | default: | |
1178 | goto out_unlock; | |
1179 | } | |
1180 | ||
1181 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
1182 | gso_type |= SKB_GSO_TCP_ECN; | |
1183 | ||
1184 | if (vnet_hdr.gso_size == 0) | |
1185 | goto out_unlock; | |
1186 | ||
1187 | } | |
1188 | } | |
1189 | ||
1da177e4 | 1190 | err = -EMSGSIZE; |
bfd5f4a3 | 1191 | if (!gso_type && (len > dev->mtu+reserve)) |
1da177e4 LT |
1192 | goto out_unlock; |
1193 | ||
bfd5f4a3 SS |
1194 | err = -ENOBUFS; |
1195 | skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev), | |
1196 | LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len, | |
1197 | msg->msg_flags & MSG_DONTWAIT, &err); | |
40d4e3df | 1198 | if (skb == NULL) |
1da177e4 LT |
1199 | goto out_unlock; |
1200 | ||
bfd5f4a3 | 1201 | skb_set_network_header(skb, reserve); |
1da177e4 | 1202 | |
0c4e8581 SH |
1203 | err = -EINVAL; |
1204 | if (sock->type == SOCK_DGRAM && | |
bfd5f4a3 | 1205 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
0c4e8581 | 1206 | goto out_free; |
1da177e4 LT |
1207 | |
1208 | /* Returns -EFAULT on error */ | |
bfd5f4a3 | 1209 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
1da177e4 LT |
1210 | if (err) |
1211 | goto out_free; | |
2244d07b | 1212 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ed85b565 RC |
1213 | if (err < 0) |
1214 | goto out_free; | |
1da177e4 LT |
1215 | |
1216 | skb->protocol = proto; | |
1217 | skb->dev = dev; | |
1218 | skb->priority = sk->sk_priority; | |
2d37a186 | 1219 | skb->mark = sk->sk_mark; |
1da177e4 | 1220 | |
bfd5f4a3 SS |
1221 | if (po->has_vnet_hdr) { |
1222 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
1223 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, | |
1224 | vnet_hdr.csum_offset)) { | |
1225 | err = -EINVAL; | |
1226 | goto out_free; | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; | |
1231 | skb_shinfo(skb)->gso_type = gso_type; | |
1232 | ||
1233 | /* Header must be checked, and gso_segs computed. */ | |
1234 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1235 | skb_shinfo(skb)->gso_segs = 0; | |
1236 | ||
1237 | len += vnet_hdr_len; | |
1238 | } | |
1239 | ||
1da177e4 LT |
1240 | /* |
1241 | * Now send it | |
1242 | */ | |
1243 | ||
1244 | err = dev_queue_xmit(skb); | |
1245 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
1246 | goto out_unlock; | |
1247 | ||
1248 | dev_put(dev); | |
1249 | ||
40d4e3df | 1250 | return len; |
1da177e4 LT |
1251 | |
1252 | out_free: | |
1253 | kfree_skb(skb); | |
1254 | out_unlock: | |
1255 | if (dev) | |
1256 | dev_put(dev); | |
1257 | out: | |
1258 | return err; | |
1259 | } | |
1260 | ||
69e3c75f JB |
1261 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1262 | struct msghdr *msg, size_t len) | |
1263 | { | |
69e3c75f JB |
1264 | struct sock *sk = sock->sk; |
1265 | struct packet_sock *po = pkt_sk(sk); | |
1266 | if (po->tx_ring.pg_vec) | |
1267 | return tpacket_snd(po, msg); | |
1268 | else | |
69e3c75f JB |
1269 | return packet_snd(sock, msg, len); |
1270 | } | |
1271 | ||
1da177e4 LT |
1272 | /* |
1273 | * Close a PACKET socket. This is fairly simple. We immediately go | |
1274 | * to 'closed' state and remove our protocol entry in the device list. | |
1275 | */ | |
1276 | ||
1277 | static int packet_release(struct socket *sock) | |
1278 | { | |
1279 | struct sock *sk = sock->sk; | |
1280 | struct packet_sock *po; | |
d12d01d6 | 1281 | struct net *net; |
69e3c75f | 1282 | struct tpacket_req req; |
1da177e4 LT |
1283 | |
1284 | if (!sk) | |
1285 | return 0; | |
1286 | ||
3b1e0a65 | 1287 | net = sock_net(sk); |
1da177e4 LT |
1288 | po = pkt_sk(sk); |
1289 | ||
808f5114 | 1290 | spin_lock_bh(&net->packet.sklist_lock); |
1291 | sk_del_node_init_rcu(sk); | |
920de804 | 1292 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
808f5114 | 1293 | spin_unlock_bh(&net->packet.sklist_lock); |
1da177e4 | 1294 | |
808f5114 | 1295 | spin_lock(&po->bind_lock); |
1da177e4 LT |
1296 | if (po->running) { |
1297 | /* | |
808f5114 | 1298 | * Remove from protocol table |
1da177e4 | 1299 | */ |
1da177e4 LT |
1300 | po->running = 0; |
1301 | po->num = 0; | |
808f5114 | 1302 | __dev_remove_pack(&po->prot_hook); |
1da177e4 LT |
1303 | __sock_put(sk); |
1304 | } | |
808f5114 | 1305 | spin_unlock(&po->bind_lock); |
1da177e4 | 1306 | |
1da177e4 | 1307 | packet_flush_mclist(sk); |
1da177e4 | 1308 | |
69e3c75f JB |
1309 | memset(&req, 0, sizeof(req)); |
1310 | ||
1311 | if (po->rx_ring.pg_vec) | |
1312 | packet_set_ring(sk, &req, 1, 0); | |
1313 | ||
1314 | if (po->tx_ring.pg_vec) | |
1315 | packet_set_ring(sk, &req, 1, 1); | |
1da177e4 | 1316 | |
808f5114 | 1317 | synchronize_net(); |
1da177e4 LT |
1318 | /* |
1319 | * Now the socket is dead. No more input will appear. | |
1320 | */ | |
1da177e4 LT |
1321 | sock_orphan(sk); |
1322 | sock->sk = NULL; | |
1323 | ||
1324 | /* Purge queues */ | |
1325 | ||
1326 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 1327 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1328 | |
1329 | sock_put(sk); | |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * Attach a packet hook. | |
1335 | */ | |
1336 | ||
0e11c91e | 1337 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
1338 | { |
1339 | struct packet_sock *po = pkt_sk(sk); | |
1340 | /* | |
1341 | * Detach an existing hook if present. | |
1342 | */ | |
1343 | ||
1344 | lock_sock(sk); | |
1345 | ||
1346 | spin_lock(&po->bind_lock); | |
1347 | if (po->running) { | |
1348 | __sock_put(sk); | |
1349 | po->running = 0; | |
1350 | po->num = 0; | |
1351 | spin_unlock(&po->bind_lock); | |
1352 | dev_remove_pack(&po->prot_hook); | |
1353 | spin_lock(&po->bind_lock); | |
1354 | } | |
1355 | ||
1356 | po->num = protocol; | |
1357 | po->prot_hook.type = protocol; | |
1358 | po->prot_hook.dev = dev; | |
1359 | ||
1360 | po->ifindex = dev ? dev->ifindex : 0; | |
1361 | ||
1362 | if (protocol == 0) | |
1363 | goto out_unlock; | |
1364 | ||
be85d4ad | 1365 | if (!dev || (dev->flags & IFF_UP)) { |
1da177e4 LT |
1366 | dev_add_pack(&po->prot_hook); |
1367 | sock_hold(sk); | |
1368 | po->running = 1; | |
be85d4ad UT |
1369 | } else { |
1370 | sk->sk_err = ENETDOWN; | |
1371 | if (!sock_flag(sk, SOCK_DEAD)) | |
1372 | sk->sk_error_report(sk); | |
1da177e4 LT |
1373 | } |
1374 | ||
1375 | out_unlock: | |
1376 | spin_unlock(&po->bind_lock); | |
1377 | release_sock(sk); | |
1378 | return 0; | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * Bind a packet socket to a device | |
1383 | */ | |
1384 | ||
40d4e3df ED |
1385 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1386 | int addr_len) | |
1da177e4 | 1387 | { |
40d4e3df | 1388 | struct sock *sk = sock->sk; |
1da177e4 LT |
1389 | char name[15]; |
1390 | struct net_device *dev; | |
1391 | int err = -ENODEV; | |
1ce4f28b | 1392 | |
1da177e4 LT |
1393 | /* |
1394 | * Check legality | |
1395 | */ | |
1ce4f28b | 1396 | |
8ae55f04 | 1397 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 1398 | return -EINVAL; |
40d4e3df | 1399 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 1400 | |
3b1e0a65 | 1401 | dev = dev_get_by_name(sock_net(sk), name); |
1da177e4 LT |
1402 | if (dev) { |
1403 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); | |
1404 | dev_put(dev); | |
1405 | } | |
1406 | return err; | |
1407 | } | |
1da177e4 LT |
1408 | |
1409 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1410 | { | |
40d4e3df ED |
1411 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1412 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1413 | struct net_device *dev = NULL; |
1414 | int err; | |
1415 | ||
1416 | ||
1417 | /* | |
1418 | * Check legality | |
1419 | */ | |
1ce4f28b | 1420 | |
1da177e4 LT |
1421 | if (addr_len < sizeof(struct sockaddr_ll)) |
1422 | return -EINVAL; | |
1423 | if (sll->sll_family != AF_PACKET) | |
1424 | return -EINVAL; | |
1425 | ||
1426 | if (sll->sll_ifindex) { | |
1427 | err = -ENODEV; | |
3b1e0a65 | 1428 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
1429 | if (dev == NULL) |
1430 | goto out; | |
1431 | } | |
1432 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1433 | if (dev) | |
1434 | dev_put(dev); | |
1435 | ||
1436 | out: | |
1437 | return err; | |
1438 | } | |
1439 | ||
1440 | static struct proto packet_proto = { | |
1441 | .name = "PACKET", | |
1442 | .owner = THIS_MODULE, | |
1443 | .obj_size = sizeof(struct packet_sock), | |
1444 | }; | |
1445 | ||
1446 | /* | |
1ce4f28b | 1447 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
1448 | */ |
1449 | ||
3f378b68 EP |
1450 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
1451 | int kern) | |
1da177e4 LT |
1452 | { |
1453 | struct sock *sk; | |
1454 | struct packet_sock *po; | |
0e11c91e | 1455 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1456 | int err; |
1457 | ||
1458 | if (!capable(CAP_NET_RAW)) | |
1459 | return -EPERM; | |
be02097c DM |
1460 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1461 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
1462 | return -ESOCKTNOSUPPORT; |
1463 | ||
1464 | sock->state = SS_UNCONNECTED; | |
1465 | ||
1466 | err = -ENOBUFS; | |
6257ff21 | 1467 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
1468 | if (sk == NULL) |
1469 | goto out; | |
1470 | ||
1471 | sock->ops = &packet_ops; | |
1da177e4 LT |
1472 | if (sock->type == SOCK_PACKET) |
1473 | sock->ops = &packet_ops_spkt; | |
be02097c | 1474 | |
1da177e4 LT |
1475 | sock_init_data(sock, sk); |
1476 | ||
1477 | po = pkt_sk(sk); | |
1478 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1479 | po->num = proto; |
1da177e4 LT |
1480 | |
1481 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 1482 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
1483 | |
1484 | /* | |
1485 | * Attach a protocol block | |
1486 | */ | |
1487 | ||
1488 | spin_lock_init(&po->bind_lock); | |
905db440 | 1489 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 1490 | po->prot_hook.func = packet_rcv; |
be02097c | 1491 | |
1da177e4 LT |
1492 | if (sock->type == SOCK_PACKET) |
1493 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1494 | |
1da177e4 LT |
1495 | po->prot_hook.af_packet_priv = sk; |
1496 | ||
0e11c91e AV |
1497 | if (proto) { |
1498 | po->prot_hook.type = proto; | |
1da177e4 LT |
1499 | dev_add_pack(&po->prot_hook); |
1500 | sock_hold(sk); | |
1501 | po->running = 1; | |
1502 | } | |
1503 | ||
808f5114 | 1504 | spin_lock_bh(&net->packet.sklist_lock); |
1505 | sk_add_node_rcu(sk, &net->packet.sklist); | |
3680453c | 1506 | sock_prot_inuse_add(net, &packet_proto, 1); |
808f5114 | 1507 | spin_unlock_bh(&net->packet.sklist_lock); |
1508 | ||
40d4e3df | 1509 | return 0; |
1da177e4 LT |
1510 | out: |
1511 | return err; | |
1512 | } | |
1513 | ||
ed85b565 RC |
1514 | static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len) |
1515 | { | |
1516 | struct sock_exterr_skb *serr; | |
1517 | struct sk_buff *skb, *skb2; | |
1518 | int copied, err; | |
1519 | ||
1520 | err = -EAGAIN; | |
1521 | skb = skb_dequeue(&sk->sk_error_queue); | |
1522 | if (skb == NULL) | |
1523 | goto out; | |
1524 | ||
1525 | copied = skb->len; | |
1526 | if (copied > len) { | |
1527 | msg->msg_flags |= MSG_TRUNC; | |
1528 | copied = len; | |
1529 | } | |
1530 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1531 | if (err) | |
1532 | goto out_free_skb; | |
1533 | ||
1534 | sock_recv_timestamp(msg, sk, skb); | |
1535 | ||
1536 | serr = SKB_EXT_ERR(skb); | |
1537 | put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP, | |
1538 | sizeof(serr->ee), &serr->ee); | |
1539 | ||
1540 | msg->msg_flags |= MSG_ERRQUEUE; | |
1541 | err = copied; | |
1542 | ||
1543 | /* Reset and regenerate socket error */ | |
1544 | spin_lock_bh(&sk->sk_error_queue.lock); | |
1545 | sk->sk_err = 0; | |
1546 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
1547 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
1548 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1549 | sk->sk_error_report(sk); | |
1550 | } else | |
1551 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1552 | ||
1553 | out_free_skb: | |
1554 | kfree_skb(skb); | |
1555 | out: | |
1556 | return err; | |
1557 | } | |
1558 | ||
1da177e4 LT |
1559 | /* |
1560 | * Pull a packet from our receive queue and hand it to the user. | |
1561 | * If necessary we block. | |
1562 | */ | |
1563 | ||
1564 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1565 | struct msghdr *msg, size_t len, int flags) | |
1566 | { | |
1567 | struct sock *sk = sock->sk; | |
1568 | struct sk_buff *skb; | |
1569 | int copied, err; | |
0fb375fb | 1570 | struct sockaddr_ll *sll; |
bfd5f4a3 | 1571 | int vnet_hdr_len = 0; |
1da177e4 LT |
1572 | |
1573 | err = -EINVAL; | |
ed85b565 | 1574 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
1da177e4 LT |
1575 | goto out; |
1576 | ||
1577 | #if 0 | |
1578 | /* What error should we return now? EUNATTACH? */ | |
1579 | if (pkt_sk(sk)->ifindex < 0) | |
1580 | return -ENODEV; | |
1581 | #endif | |
1582 | ||
ed85b565 RC |
1583 | if (flags & MSG_ERRQUEUE) { |
1584 | err = packet_recv_error(sk, msg, len); | |
1585 | goto out; | |
1586 | } | |
1587 | ||
1da177e4 LT |
1588 | /* |
1589 | * Call the generic datagram receiver. This handles all sorts | |
1590 | * of horrible races and re-entrancy so we can forget about it | |
1591 | * in the protocol layers. | |
1592 | * | |
1593 | * Now it will return ENETDOWN, if device have just gone down, | |
1594 | * but then it will block. | |
1595 | */ | |
1596 | ||
40d4e3df | 1597 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1598 | |
1599 | /* | |
1ce4f28b | 1600 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1601 | * handles the blocking we don't see and worry about blocking |
1602 | * retries. | |
1603 | */ | |
1604 | ||
8ae55f04 | 1605 | if (skb == NULL) |
1da177e4 LT |
1606 | goto out; |
1607 | ||
bfd5f4a3 SS |
1608 | if (pkt_sk(sk)->has_vnet_hdr) { |
1609 | struct virtio_net_hdr vnet_hdr = { 0 }; | |
1610 | ||
1611 | err = -EINVAL; | |
1612 | vnet_hdr_len = sizeof(vnet_hdr); | |
1f18b717 | 1613 | if (len < vnet_hdr_len) |
bfd5f4a3 SS |
1614 | goto out_free; |
1615 | ||
1f18b717 MK |
1616 | len -= vnet_hdr_len; |
1617 | ||
bfd5f4a3 SS |
1618 | if (skb_is_gso(skb)) { |
1619 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1620 | ||
1621 | /* This is a hint as to how much should be linear. */ | |
1622 | vnet_hdr.hdr_len = skb_headlen(skb); | |
1623 | vnet_hdr.gso_size = sinfo->gso_size; | |
1624 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1625 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1626 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1627 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
1628 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
1629 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
1630 | else if (sinfo->gso_type & SKB_GSO_FCOE) | |
1631 | goto out_free; | |
1632 | else | |
1633 | BUG(); | |
1634 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
1635 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1636 | } else | |
1637 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1638 | ||
1639 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1640 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
1641 | vnet_hdr.csum_start = skb->csum_start - | |
1642 | skb_headroom(skb); | |
1643 | vnet_hdr.csum_offset = skb->csum_offset; | |
1644 | } /* else everything is zero */ | |
1645 | ||
1646 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, | |
1647 | vnet_hdr_len); | |
1648 | if (err < 0) | |
1649 | goto out_free; | |
1650 | } | |
1651 | ||
0fb375fb EB |
1652 | /* |
1653 | * If the address length field is there to be filled in, we fill | |
1654 | * it in now. | |
1655 | */ | |
1656 | ||
ffbc6111 | 1657 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1658 | if (sock->type == SOCK_PACKET) |
1659 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1660 | else | |
1661 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1662 | ||
1da177e4 LT |
1663 | /* |
1664 | * You lose any data beyond the buffer you gave. If it worries a | |
1665 | * user program they can ask the device for its MTU anyway. | |
1666 | */ | |
1667 | ||
1668 | copied = skb->len; | |
40d4e3df ED |
1669 | if (copied > len) { |
1670 | copied = len; | |
1671 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
1672 | } |
1673 | ||
1674 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1675 | if (err) | |
1676 | goto out_free; | |
1677 | ||
3b885787 | 1678 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
1679 | |
1680 | if (msg->msg_name) | |
ffbc6111 HX |
1681 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1682 | msg->msg_namelen); | |
1da177e4 | 1683 | |
8dc41944 | 1684 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1685 | struct tpacket_auxdata aux; |
1686 | ||
1687 | aux.tp_status = TP_STATUS_USER; | |
1688 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1689 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1690 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1691 | aux.tp_snaplen = skb->len; | |
1692 | aux.tp_mac = 0; | |
bbe735e4 | 1693 | aux.tp_net = skb_network_offset(skb); |
05423b24 | 1694 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
ffbc6111 HX |
1695 | |
1696 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); | |
8dc41944 HX |
1697 | } |
1698 | ||
1da177e4 LT |
1699 | /* |
1700 | * Free or return the buffer as appropriate. Again this | |
1701 | * hides all the races and re-entrancy issues from us. | |
1702 | */ | |
bfd5f4a3 | 1703 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
1704 | |
1705 | out_free: | |
1706 | skb_free_datagram(sk, skb); | |
1707 | out: | |
1708 | return err; | |
1709 | } | |
1710 | ||
1da177e4 LT |
1711 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1712 | int *uaddr_len, int peer) | |
1713 | { | |
1714 | struct net_device *dev; | |
1715 | struct sock *sk = sock->sk; | |
1716 | ||
1717 | if (peer) | |
1718 | return -EOPNOTSUPP; | |
1719 | ||
1720 | uaddr->sa_family = AF_PACKET; | |
654d1f8a ED |
1721 | rcu_read_lock(); |
1722 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
1723 | if (dev) | |
67286640 | 1724 | strncpy(uaddr->sa_data, dev->name, 14); |
654d1f8a | 1725 | else |
1da177e4 | 1726 | memset(uaddr->sa_data, 0, 14); |
654d1f8a | 1727 | rcu_read_unlock(); |
1da177e4 LT |
1728 | *uaddr_len = sizeof(*uaddr); |
1729 | ||
1730 | return 0; | |
1731 | } | |
1da177e4 LT |
1732 | |
1733 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1734 | int *uaddr_len, int peer) | |
1735 | { | |
1736 | struct net_device *dev; | |
1737 | struct sock *sk = sock->sk; | |
1738 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 1739 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
1740 | |
1741 | if (peer) | |
1742 | return -EOPNOTSUPP; | |
1743 | ||
1744 | sll->sll_family = AF_PACKET; | |
1745 | sll->sll_ifindex = po->ifindex; | |
1746 | sll->sll_protocol = po->num; | |
67286640 | 1747 | sll->sll_pkttype = 0; |
654d1f8a ED |
1748 | rcu_read_lock(); |
1749 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
1750 | if (dev) { |
1751 | sll->sll_hatype = dev->type; | |
1752 | sll->sll_halen = dev->addr_len; | |
1753 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
1754 | } else { |
1755 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1756 | sll->sll_halen = 0; | |
1757 | } | |
654d1f8a | 1758 | rcu_read_unlock(); |
0fb375fb | 1759 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1760 | |
1761 | return 0; | |
1762 | } | |
1763 | ||
2aeb0b88 WC |
1764 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
1765 | int what) | |
1da177e4 LT |
1766 | { |
1767 | switch (i->type) { | |
1768 | case PACKET_MR_MULTICAST: | |
1162563f JP |
1769 | if (i->alen != dev->addr_len) |
1770 | return -EINVAL; | |
1da177e4 | 1771 | if (what > 0) |
22bedad3 | 1772 | return dev_mc_add(dev, i->addr); |
1da177e4 | 1773 | else |
22bedad3 | 1774 | return dev_mc_del(dev, i->addr); |
1da177e4 LT |
1775 | break; |
1776 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 1777 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
1778 | break; |
1779 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 1780 | return dev_set_allmulti(dev, what); |
1da177e4 | 1781 | break; |
d95ed927 | 1782 | case PACKET_MR_UNICAST: |
1162563f JP |
1783 | if (i->alen != dev->addr_len) |
1784 | return -EINVAL; | |
d95ed927 | 1785 | if (what > 0) |
a748ee24 | 1786 | return dev_uc_add(dev, i->addr); |
d95ed927 | 1787 | else |
a748ee24 | 1788 | return dev_uc_del(dev, i->addr); |
d95ed927 | 1789 | break; |
40d4e3df ED |
1790 | default: |
1791 | break; | |
1da177e4 | 1792 | } |
2aeb0b88 | 1793 | return 0; |
1da177e4 LT |
1794 | } |
1795 | ||
1796 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1797 | { | |
40d4e3df | 1798 | for ( ; i; i = i->next) { |
1da177e4 LT |
1799 | if (i->ifindex == dev->ifindex) |
1800 | packet_dev_mc(dev, i, what); | |
1801 | } | |
1802 | } | |
1803 | ||
0fb375fb | 1804 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1805 | { |
1806 | struct packet_sock *po = pkt_sk(sk); | |
1807 | struct packet_mclist *ml, *i; | |
1808 | struct net_device *dev; | |
1809 | int err; | |
1810 | ||
1811 | rtnl_lock(); | |
1812 | ||
1813 | err = -ENODEV; | |
3b1e0a65 | 1814 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
1815 | if (!dev) |
1816 | goto done; | |
1817 | ||
1818 | err = -EINVAL; | |
1162563f | 1819 | if (mreq->mr_alen > dev->addr_len) |
1da177e4 LT |
1820 | goto done; |
1821 | ||
1822 | err = -ENOBUFS; | |
8b3a7005 | 1823 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1824 | if (i == NULL) |
1825 | goto done; | |
1826 | ||
1827 | err = 0; | |
1828 | for (ml = po->mclist; ml; ml = ml->next) { | |
1829 | if (ml->ifindex == mreq->mr_ifindex && | |
1830 | ml->type == mreq->mr_type && | |
1831 | ml->alen == mreq->mr_alen && | |
1832 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1833 | ml->count++; | |
1834 | /* Free the new element ... */ | |
1835 | kfree(i); | |
1836 | goto done; | |
1837 | } | |
1838 | } | |
1839 | ||
1840 | i->type = mreq->mr_type; | |
1841 | i->ifindex = mreq->mr_ifindex; | |
1842 | i->alen = mreq->mr_alen; | |
1843 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1844 | i->count = 1; | |
1845 | i->next = po->mclist; | |
1846 | po->mclist = i; | |
2aeb0b88 WC |
1847 | err = packet_dev_mc(dev, i, 1); |
1848 | if (err) { | |
1849 | po->mclist = i->next; | |
1850 | kfree(i); | |
1851 | } | |
1da177e4 LT |
1852 | |
1853 | done: | |
1854 | rtnl_unlock(); | |
1855 | return err; | |
1856 | } | |
1857 | ||
0fb375fb | 1858 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1859 | { |
1860 | struct packet_mclist *ml, **mlp; | |
1861 | ||
1862 | rtnl_lock(); | |
1863 | ||
1864 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1865 | if (ml->ifindex == mreq->mr_ifindex && | |
1866 | ml->type == mreq->mr_type && | |
1867 | ml->alen == mreq->mr_alen && | |
1868 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1869 | if (--ml->count == 0) { | |
1870 | struct net_device *dev; | |
1871 | *mlp = ml->next; | |
ad959e76 ED |
1872 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1873 | if (dev) | |
1da177e4 | 1874 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1875 | kfree(ml); |
1876 | } | |
1877 | rtnl_unlock(); | |
1878 | return 0; | |
1879 | } | |
1880 | } | |
1881 | rtnl_unlock(); | |
1882 | return -EADDRNOTAVAIL; | |
1883 | } | |
1884 | ||
1885 | static void packet_flush_mclist(struct sock *sk) | |
1886 | { | |
1887 | struct packet_sock *po = pkt_sk(sk); | |
1888 | struct packet_mclist *ml; | |
1889 | ||
1890 | if (!po->mclist) | |
1891 | return; | |
1892 | ||
1893 | rtnl_lock(); | |
1894 | while ((ml = po->mclist) != NULL) { | |
1895 | struct net_device *dev; | |
1896 | ||
1897 | po->mclist = ml->next; | |
ad959e76 ED |
1898 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1899 | if (dev != NULL) | |
1da177e4 | 1900 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1901 | kfree(ml); |
1902 | } | |
1903 | rtnl_unlock(); | |
1904 | } | |
1da177e4 LT |
1905 | |
1906 | static int | |
b7058842 | 1907 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1908 | { |
1909 | struct sock *sk = sock->sk; | |
8dc41944 | 1910 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1911 | int ret; |
1912 | ||
1913 | if (level != SOL_PACKET) | |
1914 | return -ENOPROTOOPT; | |
1915 | ||
69e3c75f | 1916 | switch (optname) { |
1ce4f28b | 1917 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
1918 | case PACKET_DROP_MEMBERSHIP: |
1919 | { | |
0fb375fb EB |
1920 | struct packet_mreq_max mreq; |
1921 | int len = optlen; | |
1922 | memset(&mreq, 0, sizeof(mreq)); | |
1923 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1924 | return -EINVAL; |
0fb375fb EB |
1925 | if (len > sizeof(mreq)) |
1926 | len = sizeof(mreq); | |
40d4e3df | 1927 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 1928 | return -EFAULT; |
0fb375fb EB |
1929 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1930 | return -EINVAL; | |
1da177e4 LT |
1931 | if (optname == PACKET_ADD_MEMBERSHIP) |
1932 | ret = packet_mc_add(sk, &mreq); | |
1933 | else | |
1934 | ret = packet_mc_drop(sk, &mreq); | |
1935 | return ret; | |
1936 | } | |
a2efcfa0 | 1937 | |
1da177e4 | 1938 | case PACKET_RX_RING: |
69e3c75f | 1939 | case PACKET_TX_RING: |
1da177e4 LT |
1940 | { |
1941 | struct tpacket_req req; | |
1942 | ||
40d4e3df | 1943 | if (optlen < sizeof(req)) |
1da177e4 | 1944 | return -EINVAL; |
bfd5f4a3 SS |
1945 | if (pkt_sk(sk)->has_vnet_hdr) |
1946 | return -EINVAL; | |
40d4e3df | 1947 | if (copy_from_user(&req, optval, sizeof(req))) |
1da177e4 | 1948 | return -EFAULT; |
69e3c75f | 1949 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1da177e4 LT |
1950 | } |
1951 | case PACKET_COPY_THRESH: | |
1952 | { | |
1953 | int val; | |
1954 | ||
40d4e3df | 1955 | if (optlen != sizeof(val)) |
1da177e4 | 1956 | return -EINVAL; |
40d4e3df | 1957 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
1958 | return -EFAULT; |
1959 | ||
1960 | pkt_sk(sk)->copy_thresh = val; | |
1961 | return 0; | |
1962 | } | |
bbd6ef87 PM |
1963 | case PACKET_VERSION: |
1964 | { | |
1965 | int val; | |
1966 | ||
1967 | if (optlen != sizeof(val)) | |
1968 | return -EINVAL; | |
69e3c75f | 1969 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
1970 | return -EBUSY; |
1971 | if (copy_from_user(&val, optval, sizeof(val))) | |
1972 | return -EFAULT; | |
1973 | switch (val) { | |
1974 | case TPACKET_V1: | |
1975 | case TPACKET_V2: | |
1976 | po->tp_version = val; | |
1977 | return 0; | |
1978 | default: | |
1979 | return -EINVAL; | |
1980 | } | |
1981 | } | |
8913336a PM |
1982 | case PACKET_RESERVE: |
1983 | { | |
1984 | unsigned int val; | |
1985 | ||
1986 | if (optlen != sizeof(val)) | |
1987 | return -EINVAL; | |
69e3c75f | 1988 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
1989 | return -EBUSY; |
1990 | if (copy_from_user(&val, optval, sizeof(val))) | |
1991 | return -EFAULT; | |
1992 | po->tp_reserve = val; | |
1993 | return 0; | |
1994 | } | |
69e3c75f JB |
1995 | case PACKET_LOSS: |
1996 | { | |
1997 | unsigned int val; | |
1998 | ||
1999 | if (optlen != sizeof(val)) | |
2000 | return -EINVAL; | |
2001 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2002 | return -EBUSY; | |
2003 | if (copy_from_user(&val, optval, sizeof(val))) | |
2004 | return -EFAULT; | |
2005 | po->tp_loss = !!val; | |
2006 | return 0; | |
2007 | } | |
8dc41944 HX |
2008 | case PACKET_AUXDATA: |
2009 | { | |
2010 | int val; | |
2011 | ||
2012 | if (optlen < sizeof(val)) | |
2013 | return -EINVAL; | |
2014 | if (copy_from_user(&val, optval, sizeof(val))) | |
2015 | return -EFAULT; | |
2016 | ||
2017 | po->auxdata = !!val; | |
2018 | return 0; | |
2019 | } | |
80feaacb PWJ |
2020 | case PACKET_ORIGDEV: |
2021 | { | |
2022 | int val; | |
2023 | ||
2024 | if (optlen < sizeof(val)) | |
2025 | return -EINVAL; | |
2026 | if (copy_from_user(&val, optval, sizeof(val))) | |
2027 | return -EFAULT; | |
2028 | ||
2029 | po->origdev = !!val; | |
2030 | return 0; | |
2031 | } | |
bfd5f4a3 SS |
2032 | case PACKET_VNET_HDR: |
2033 | { | |
2034 | int val; | |
2035 | ||
2036 | if (sock->type != SOCK_RAW) | |
2037 | return -EINVAL; | |
2038 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2039 | return -EBUSY; | |
2040 | if (optlen < sizeof(val)) | |
2041 | return -EINVAL; | |
2042 | if (copy_from_user(&val, optval, sizeof(val))) | |
2043 | return -EFAULT; | |
2044 | ||
2045 | po->has_vnet_hdr = !!val; | |
2046 | return 0; | |
2047 | } | |
614f60fa SM |
2048 | case PACKET_TIMESTAMP: |
2049 | { | |
2050 | int val; | |
2051 | ||
2052 | if (optlen != sizeof(val)) | |
2053 | return -EINVAL; | |
2054 | if (copy_from_user(&val, optval, sizeof(val))) | |
2055 | return -EFAULT; | |
2056 | ||
2057 | po->tp_tstamp = val; | |
2058 | return 0; | |
2059 | } | |
1da177e4 LT |
2060 | default: |
2061 | return -ENOPROTOOPT; | |
2062 | } | |
2063 | } | |
2064 | ||
2065 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
2066 | char __user *optval, int __user *optlen) | |
2067 | { | |
2068 | int len; | |
8dc41944 | 2069 | int val; |
1da177e4 LT |
2070 | struct sock *sk = sock->sk; |
2071 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
2072 | void *data; |
2073 | struct tpacket_stats st; | |
1da177e4 LT |
2074 | |
2075 | if (level != SOL_PACKET) | |
2076 | return -ENOPROTOOPT; | |
2077 | ||
8ae55f04 KK |
2078 | if (get_user(len, optlen)) |
2079 | return -EFAULT; | |
1da177e4 LT |
2080 | |
2081 | if (len < 0) | |
2082 | return -EINVAL; | |
1ce4f28b | 2083 | |
69e3c75f | 2084 | switch (optname) { |
1da177e4 | 2085 | case PACKET_STATISTICS: |
1da177e4 LT |
2086 | if (len > sizeof(struct tpacket_stats)) |
2087 | len = sizeof(struct tpacket_stats); | |
2088 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2089 | st = po->stats; | |
2090 | memset(&po->stats, 0, sizeof(st)); | |
2091 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2092 | st.tp_packets += st.tp_drops; | |
2093 | ||
8dc41944 HX |
2094 | data = &st; |
2095 | break; | |
2096 | case PACKET_AUXDATA: | |
2097 | if (len > sizeof(int)) | |
2098 | len = sizeof(int); | |
2099 | val = po->auxdata; | |
2100 | ||
80feaacb PWJ |
2101 | data = &val; |
2102 | break; | |
2103 | case PACKET_ORIGDEV: | |
2104 | if (len > sizeof(int)) | |
2105 | len = sizeof(int); | |
2106 | val = po->origdev; | |
2107 | ||
bfd5f4a3 SS |
2108 | data = &val; |
2109 | break; | |
2110 | case PACKET_VNET_HDR: | |
2111 | if (len > sizeof(int)) | |
2112 | len = sizeof(int); | |
2113 | val = po->has_vnet_hdr; | |
2114 | ||
8dc41944 | 2115 | data = &val; |
1da177e4 | 2116 | break; |
bbd6ef87 PM |
2117 | case PACKET_VERSION: |
2118 | if (len > sizeof(int)) | |
2119 | len = sizeof(int); | |
2120 | val = po->tp_version; | |
2121 | data = &val; | |
2122 | break; | |
2123 | case PACKET_HDRLEN: | |
2124 | if (len > sizeof(int)) | |
2125 | len = sizeof(int); | |
2126 | if (copy_from_user(&val, optval, len)) | |
2127 | return -EFAULT; | |
2128 | switch (val) { | |
2129 | case TPACKET_V1: | |
2130 | val = sizeof(struct tpacket_hdr); | |
2131 | break; | |
2132 | case TPACKET_V2: | |
2133 | val = sizeof(struct tpacket2_hdr); | |
2134 | break; | |
2135 | default: | |
2136 | return -EINVAL; | |
2137 | } | |
2138 | data = &val; | |
2139 | break; | |
8913336a PM |
2140 | case PACKET_RESERVE: |
2141 | if (len > sizeof(unsigned int)) | |
2142 | len = sizeof(unsigned int); | |
2143 | val = po->tp_reserve; | |
2144 | data = &val; | |
2145 | break; | |
69e3c75f JB |
2146 | case PACKET_LOSS: |
2147 | if (len > sizeof(unsigned int)) | |
2148 | len = sizeof(unsigned int); | |
2149 | val = po->tp_loss; | |
2150 | data = &val; | |
2151 | break; | |
614f60fa SM |
2152 | case PACKET_TIMESTAMP: |
2153 | if (len > sizeof(int)) | |
2154 | len = sizeof(int); | |
2155 | val = po->tp_tstamp; | |
2156 | data = &val; | |
2157 | break; | |
1da177e4 LT |
2158 | default: |
2159 | return -ENOPROTOOPT; | |
2160 | } | |
2161 | ||
8ae55f04 KK |
2162 | if (put_user(len, optlen)) |
2163 | return -EFAULT; | |
8dc41944 HX |
2164 | if (copy_to_user(optval, data, len)) |
2165 | return -EFAULT; | |
8ae55f04 | 2166 | return 0; |
1da177e4 LT |
2167 | } |
2168 | ||
2169 | ||
2170 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
2171 | { | |
2172 | struct sock *sk; | |
2173 | struct hlist_node *node; | |
ad930650 | 2174 | struct net_device *dev = data; |
c346dca1 | 2175 | struct net *net = dev_net(dev); |
1da177e4 | 2176 | |
808f5114 | 2177 | rcu_read_lock(); |
2178 | sk_for_each_rcu(sk, node, &net->packet.sklist) { | |
1da177e4 LT |
2179 | struct packet_sock *po = pkt_sk(sk); |
2180 | ||
2181 | switch (msg) { | |
2182 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
2183 | if (po->mclist) |
2184 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
2185 | /* fallthrough */ |
2186 | ||
1da177e4 LT |
2187 | case NETDEV_DOWN: |
2188 | if (dev->ifindex == po->ifindex) { | |
2189 | spin_lock(&po->bind_lock); | |
2190 | if (po->running) { | |
2191 | __dev_remove_pack(&po->prot_hook); | |
2192 | __sock_put(sk); | |
2193 | po->running = 0; | |
2194 | sk->sk_err = ENETDOWN; | |
2195 | if (!sock_flag(sk, SOCK_DEAD)) | |
2196 | sk->sk_error_report(sk); | |
2197 | } | |
2198 | if (msg == NETDEV_UNREGISTER) { | |
2199 | po->ifindex = -1; | |
2200 | po->prot_hook.dev = NULL; | |
2201 | } | |
2202 | spin_unlock(&po->bind_lock); | |
2203 | } | |
2204 | break; | |
2205 | case NETDEV_UP: | |
808f5114 | 2206 | if (dev->ifindex == po->ifindex) { |
2207 | spin_lock(&po->bind_lock); | |
2208 | if (po->num && !po->running) { | |
2209 | dev_add_pack(&po->prot_hook); | |
2210 | sock_hold(sk); | |
2211 | po->running = 1; | |
2212 | } | |
2213 | spin_unlock(&po->bind_lock); | |
1da177e4 | 2214 | } |
1da177e4 LT |
2215 | break; |
2216 | } | |
2217 | } | |
808f5114 | 2218 | rcu_read_unlock(); |
1da177e4 LT |
2219 | return NOTIFY_DONE; |
2220 | } | |
2221 | ||
2222 | ||
2223 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
2224 | unsigned long arg) | |
2225 | { | |
2226 | struct sock *sk = sock->sk; | |
2227 | ||
69e3c75f | 2228 | switch (cmd) { |
40d4e3df ED |
2229 | case SIOCOUTQ: |
2230 | { | |
2231 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 2232 | |
40d4e3df ED |
2233 | return put_user(amount, (int __user *)arg); |
2234 | } | |
2235 | case SIOCINQ: | |
2236 | { | |
2237 | struct sk_buff *skb; | |
2238 | int amount = 0; | |
2239 | ||
2240 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2241 | skb = skb_peek(&sk->sk_receive_queue); | |
2242 | if (skb) | |
2243 | amount = skb->len; | |
2244 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2245 | return put_user(amount, (int __user *)arg); | |
2246 | } | |
2247 | case SIOCGSTAMP: | |
2248 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
2249 | case SIOCGSTAMPNS: | |
2250 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 2251 | |
1da177e4 | 2252 | #ifdef CONFIG_INET |
40d4e3df ED |
2253 | case SIOCADDRT: |
2254 | case SIOCDELRT: | |
2255 | case SIOCDARP: | |
2256 | case SIOCGARP: | |
2257 | case SIOCSARP: | |
2258 | case SIOCGIFADDR: | |
2259 | case SIOCSIFADDR: | |
2260 | case SIOCGIFBRDADDR: | |
2261 | case SIOCSIFBRDADDR: | |
2262 | case SIOCGIFNETMASK: | |
2263 | case SIOCSIFNETMASK: | |
2264 | case SIOCGIFDSTADDR: | |
2265 | case SIOCSIFDSTADDR: | |
2266 | case SIOCSIFFLAGS: | |
40d4e3df | 2267 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
1da177e4 LT |
2268 | #endif |
2269 | ||
40d4e3df ED |
2270 | default: |
2271 | return -ENOIOCTLCMD; | |
1da177e4 LT |
2272 | } |
2273 | return 0; | |
2274 | } | |
2275 | ||
40d4e3df | 2276 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
2277 | poll_table *wait) |
2278 | { | |
2279 | struct sock *sk = sock->sk; | |
2280 | struct packet_sock *po = pkt_sk(sk); | |
2281 | unsigned int mask = datagram_poll(file, sock, wait); | |
2282 | ||
2283 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2284 | if (po->rx_ring.pg_vec) { |
2285 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) | |
1da177e4 LT |
2286 | mask |= POLLIN | POLLRDNORM; |
2287 | } | |
2288 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2289 | spin_lock_bh(&sk->sk_write_queue.lock); |
2290 | if (po->tx_ring.pg_vec) { | |
2291 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
2292 | mask |= POLLOUT | POLLWRNORM; | |
2293 | } | |
2294 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
2295 | return mask; |
2296 | } | |
2297 | ||
2298 | ||
2299 | /* Dirty? Well, I still did not learn better way to account | |
2300 | * for user mmaps. | |
2301 | */ | |
2302 | ||
2303 | static void packet_mm_open(struct vm_area_struct *vma) | |
2304 | { | |
2305 | struct file *file = vma->vm_file; | |
40d4e3df | 2306 | struct socket *sock = file->private_data; |
1da177e4 | 2307 | struct sock *sk = sock->sk; |
1ce4f28b | 2308 | |
1da177e4 LT |
2309 | if (sk) |
2310 | atomic_inc(&pkt_sk(sk)->mapped); | |
2311 | } | |
2312 | ||
2313 | static void packet_mm_close(struct vm_area_struct *vma) | |
2314 | { | |
2315 | struct file *file = vma->vm_file; | |
40d4e3df | 2316 | struct socket *sock = file->private_data; |
1da177e4 | 2317 | struct sock *sk = sock->sk; |
1ce4f28b | 2318 | |
1da177e4 LT |
2319 | if (sk) |
2320 | atomic_dec(&pkt_sk(sk)->mapped); | |
2321 | } | |
2322 | ||
f0f37e2f | 2323 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
2324 | .open = packet_mm_open, |
2325 | .close = packet_mm_close, | |
1da177e4 LT |
2326 | }; |
2327 | ||
4ebf0ae2 | 2328 | static void free_pg_vec(char **pg_vec, unsigned int order, unsigned int len) |
1da177e4 LT |
2329 | { |
2330 | int i; | |
2331 | ||
4ebf0ae2 DM |
2332 | for (i = 0; i < len; i++) { |
2333 | if (likely(pg_vec[i])) | |
2334 | free_pages((unsigned long) pg_vec[i], order); | |
1da177e4 LT |
2335 | } |
2336 | kfree(pg_vec); | |
2337 | } | |
2338 | ||
4ebf0ae2 DM |
2339 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
2340 | { | |
719bfeaa ED |
2341 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN; |
2342 | ||
2343 | return (char *) __get_free_pages(gfp_flags, order); | |
4ebf0ae2 DM |
2344 | } |
2345 | ||
2346 | static char **alloc_pg_vec(struct tpacket_req *req, int order) | |
2347 | { | |
2348 | unsigned int block_nr = req->tp_block_nr; | |
2349 | char **pg_vec; | |
2350 | int i; | |
2351 | ||
2352 | pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL); | |
2353 | if (unlikely(!pg_vec)) | |
2354 | goto out; | |
2355 | ||
2356 | for (i = 0; i < block_nr; i++) { | |
2357 | pg_vec[i] = alloc_one_pg_vec_page(order); | |
2358 | if (unlikely(!pg_vec[i])) | |
2359 | goto out_free_pgvec; | |
2360 | } | |
2361 | ||
2362 | out: | |
2363 | return pg_vec; | |
2364 | ||
2365 | out_free_pgvec: | |
2366 | free_pg_vec(pg_vec, order, block_nr); | |
2367 | pg_vec = NULL; | |
2368 | goto out; | |
2369 | } | |
1da177e4 | 2370 | |
69e3c75f JB |
2371 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2372 | int closing, int tx_ring) | |
1da177e4 LT |
2373 | { |
2374 | char **pg_vec = NULL; | |
2375 | struct packet_sock *po = pkt_sk(sk); | |
0e11c91e | 2376 | int was_running, order = 0; |
69e3c75f JB |
2377 | struct packet_ring_buffer *rb; |
2378 | struct sk_buff_head *rb_queue; | |
0e11c91e | 2379 | __be16 num; |
69e3c75f | 2380 | int err; |
1ce4f28b | 2381 | |
69e3c75f JB |
2382 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2383 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 2384 | |
69e3c75f JB |
2385 | err = -EBUSY; |
2386 | if (!closing) { | |
2387 | if (atomic_read(&po->mapped)) | |
2388 | goto out; | |
2389 | if (atomic_read(&rb->pending)) | |
2390 | goto out; | |
2391 | } | |
1da177e4 | 2392 | |
69e3c75f JB |
2393 | if (req->tp_block_nr) { |
2394 | /* Sanity tests and some calculations */ | |
2395 | err = -EBUSY; | |
2396 | if (unlikely(rb->pg_vec)) | |
2397 | goto out; | |
1da177e4 | 2398 | |
bbd6ef87 PM |
2399 | switch (po->tp_version) { |
2400 | case TPACKET_V1: | |
2401 | po->tp_hdrlen = TPACKET_HDRLEN; | |
2402 | break; | |
2403 | case TPACKET_V2: | |
2404 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
2405 | break; | |
2406 | } | |
2407 | ||
69e3c75f | 2408 | err = -EINVAL; |
4ebf0ae2 | 2409 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 2410 | goto out; |
4ebf0ae2 | 2411 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 2412 | goto out; |
8913336a | 2413 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
2414 | po->tp_reserve)) |
2415 | goto out; | |
4ebf0ae2 | 2416 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 2417 | goto out; |
1da177e4 | 2418 | |
69e3c75f JB |
2419 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2420 | if (unlikely(rb->frames_per_block <= 0)) | |
2421 | goto out; | |
2422 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
2423 | req->tp_frame_nr)) | |
2424 | goto out; | |
1da177e4 LT |
2425 | |
2426 | err = -ENOMEM; | |
4ebf0ae2 DM |
2427 | order = get_order(req->tp_block_size); |
2428 | pg_vec = alloc_pg_vec(req, order); | |
2429 | if (unlikely(!pg_vec)) | |
1da177e4 | 2430 | goto out; |
69e3c75f JB |
2431 | } |
2432 | /* Done */ | |
2433 | else { | |
2434 | err = -EINVAL; | |
4ebf0ae2 | 2435 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 2436 | goto out; |
1da177e4 LT |
2437 | } |
2438 | ||
2439 | lock_sock(sk); | |
2440 | ||
2441 | /* Detach socket from network */ | |
2442 | spin_lock(&po->bind_lock); | |
2443 | was_running = po->running; | |
2444 | num = po->num; | |
2445 | if (was_running) { | |
2446 | __dev_remove_pack(&po->prot_hook); | |
2447 | po->num = 0; | |
2448 | po->running = 0; | |
2449 | __sock_put(sk); | |
2450 | } | |
2451 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 2452 | |
1da177e4 LT |
2453 | synchronize_net(); |
2454 | ||
2455 | err = -EBUSY; | |
905db440 | 2456 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
2457 | if (closing || atomic_read(&po->mapped) == 0) { |
2458 | err = 0; | |
2459 | #define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) | |
69e3c75f JB |
2460 | spin_lock_bh(&rb_queue->lock); |
2461 | pg_vec = XC(rb->pg_vec, pg_vec); | |
2462 | rb->frame_max = (req->tp_frame_nr - 1); | |
2463 | rb->head = 0; | |
2464 | rb->frame_size = req->tp_frame_size; | |
2465 | spin_unlock_bh(&rb_queue->lock); | |
2466 | ||
2467 | order = XC(rb->pg_vec_order, order); | |
2468 | req->tp_block_nr = XC(rb->pg_vec_len, req->tp_block_nr); | |
2469 | ||
2470 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
2471 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
2472 | tpacket_rcv : packet_rcv; | |
2473 | skb_queue_purge(rb_queue); | |
1da177e4 LT |
2474 | #undef XC |
2475 | if (atomic_read(&po->mapped)) | |
40d4e3df ED |
2476 | pr_err("packet_mmap: vma is busy: %d\n", |
2477 | atomic_read(&po->mapped)); | |
1da177e4 | 2478 | } |
905db440 | 2479 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2480 | |
2481 | spin_lock(&po->bind_lock); | |
2482 | if (was_running && !po->running) { | |
2483 | sock_hold(sk); | |
2484 | po->running = 1; | |
2485 | po->num = num; | |
2486 | dev_add_pack(&po->prot_hook); | |
2487 | } | |
2488 | spin_unlock(&po->bind_lock); | |
2489 | ||
2490 | release_sock(sk); | |
2491 | ||
1da177e4 LT |
2492 | if (pg_vec) |
2493 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
2494 | out: | |
2495 | return err; | |
2496 | } | |
2497 | ||
69e3c75f JB |
2498 | static int packet_mmap(struct file *file, struct socket *sock, |
2499 | struct vm_area_struct *vma) | |
1da177e4 LT |
2500 | { |
2501 | struct sock *sk = sock->sk; | |
2502 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
2503 | unsigned long size, expected_size; |
2504 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
2505 | unsigned long start; |
2506 | int err = -EINVAL; | |
2507 | int i; | |
2508 | ||
2509 | if (vma->vm_pgoff) | |
2510 | return -EINVAL; | |
2511 | ||
905db440 | 2512 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
2513 | |
2514 | expected_size = 0; | |
2515 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
2516 | if (rb->pg_vec) { | |
2517 | expected_size += rb->pg_vec_len | |
2518 | * rb->pg_vec_pages | |
2519 | * PAGE_SIZE; | |
2520 | } | |
2521 | } | |
2522 | ||
2523 | if (expected_size == 0) | |
1da177e4 | 2524 | goto out; |
69e3c75f JB |
2525 | |
2526 | size = vma->vm_end - vma->vm_start; | |
2527 | if (size != expected_size) | |
1da177e4 LT |
2528 | goto out; |
2529 | ||
1da177e4 | 2530 | start = vma->vm_start; |
69e3c75f JB |
2531 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2532 | if (rb->pg_vec == NULL) | |
2533 | continue; | |
2534 | ||
2535 | for (i = 0; i < rb->pg_vec_len; i++) { | |
2536 | struct page *page = virt_to_page(rb->pg_vec[i]); | |
2537 | int pg_num; | |
2538 | ||
2539 | for (pg_num = 0; pg_num < rb->pg_vec_pages; | |
40d4e3df | 2540 | pg_num++, page++) { |
69e3c75f JB |
2541 | err = vm_insert_page(vma, start, page); |
2542 | if (unlikely(err)) | |
2543 | goto out; | |
2544 | start += PAGE_SIZE; | |
2545 | } | |
4ebf0ae2 | 2546 | } |
1da177e4 | 2547 | } |
69e3c75f | 2548 | |
4ebf0ae2 | 2549 | atomic_inc(&po->mapped); |
1da177e4 LT |
2550 | vma->vm_ops = &packet_mmap_ops; |
2551 | err = 0; | |
2552 | ||
2553 | out: | |
905db440 | 2554 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2555 | return err; |
2556 | } | |
1da177e4 | 2557 | |
90ddc4f0 | 2558 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
2559 | .family = PF_PACKET, |
2560 | .owner = THIS_MODULE, | |
2561 | .release = packet_release, | |
2562 | .bind = packet_bind_spkt, | |
2563 | .connect = sock_no_connect, | |
2564 | .socketpair = sock_no_socketpair, | |
2565 | .accept = sock_no_accept, | |
2566 | .getname = packet_getname_spkt, | |
2567 | .poll = datagram_poll, | |
2568 | .ioctl = packet_ioctl, | |
2569 | .listen = sock_no_listen, | |
2570 | .shutdown = sock_no_shutdown, | |
2571 | .setsockopt = sock_no_setsockopt, | |
2572 | .getsockopt = sock_no_getsockopt, | |
2573 | .sendmsg = packet_sendmsg_spkt, | |
2574 | .recvmsg = packet_recvmsg, | |
2575 | .mmap = sock_no_mmap, | |
2576 | .sendpage = sock_no_sendpage, | |
2577 | }; | |
1da177e4 | 2578 | |
90ddc4f0 | 2579 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
2580 | .family = PF_PACKET, |
2581 | .owner = THIS_MODULE, | |
2582 | .release = packet_release, | |
2583 | .bind = packet_bind, | |
2584 | .connect = sock_no_connect, | |
2585 | .socketpair = sock_no_socketpair, | |
2586 | .accept = sock_no_accept, | |
1ce4f28b | 2587 | .getname = packet_getname, |
1da177e4 LT |
2588 | .poll = packet_poll, |
2589 | .ioctl = packet_ioctl, | |
2590 | .listen = sock_no_listen, | |
2591 | .shutdown = sock_no_shutdown, | |
2592 | .setsockopt = packet_setsockopt, | |
2593 | .getsockopt = packet_getsockopt, | |
2594 | .sendmsg = packet_sendmsg, | |
2595 | .recvmsg = packet_recvmsg, | |
2596 | .mmap = packet_mmap, | |
2597 | .sendpage = sock_no_sendpage, | |
2598 | }; | |
2599 | ||
ec1b4cf7 | 2600 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
2601 | .family = PF_PACKET, |
2602 | .create = packet_create, | |
2603 | .owner = THIS_MODULE, | |
2604 | }; | |
2605 | ||
2606 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 2607 | .notifier_call = packet_notifier, |
1da177e4 LT |
2608 | }; |
2609 | ||
2610 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
2611 | |
2612 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
808f5114 | 2613 | __acquires(RCU) |
1da177e4 | 2614 | { |
e372c414 | 2615 | struct net *net = seq_file_net(seq); |
808f5114 | 2616 | |
2617 | rcu_read_lock(); | |
2618 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); | |
1da177e4 LT |
2619 | } |
2620 | ||
2621 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2622 | { | |
1bf40954 | 2623 | struct net *net = seq_file_net(seq); |
808f5114 | 2624 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
1da177e4 LT |
2625 | } |
2626 | ||
2627 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
808f5114 | 2628 | __releases(RCU) |
1da177e4 | 2629 | { |
808f5114 | 2630 | rcu_read_unlock(); |
1da177e4 LT |
2631 | } |
2632 | ||
1ce4f28b | 2633 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
2634 | { |
2635 | if (v == SEQ_START_TOKEN) | |
2636 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
2637 | else { | |
b7ceabd9 | 2638 | struct sock *s = sk_entry(v); |
1da177e4 LT |
2639 | const struct packet_sock *po = pkt_sk(s); |
2640 | ||
2641 | seq_printf(seq, | |
2642 | "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", | |
2643 | s, | |
2644 | atomic_read(&s->sk_refcnt), | |
2645 | s->sk_type, | |
2646 | ntohs(po->num), | |
2647 | po->ifindex, | |
2648 | po->running, | |
2649 | atomic_read(&s->sk_rmem_alloc), | |
2650 | sock_i_uid(s), | |
40d4e3df | 2651 | sock_i_ino(s)); |
1da177e4 LT |
2652 | } |
2653 | ||
2654 | return 0; | |
2655 | } | |
2656 | ||
56b3d975 | 2657 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
2658 | .start = packet_seq_start, |
2659 | .next = packet_seq_next, | |
2660 | .stop = packet_seq_stop, | |
2661 | .show = packet_seq_show, | |
2662 | }; | |
2663 | ||
2664 | static int packet_seq_open(struct inode *inode, struct file *file) | |
2665 | { | |
e372c414 DL |
2666 | return seq_open_net(inode, file, &packet_seq_ops, |
2667 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2668 | } |
2669 | ||
da7071d7 | 2670 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
2671 | .owner = THIS_MODULE, |
2672 | .open = packet_seq_open, | |
2673 | .read = seq_read, | |
2674 | .llseek = seq_lseek, | |
e372c414 | 2675 | .release = seq_release_net, |
1da177e4 LT |
2676 | }; |
2677 | ||
2678 | #endif | |
2679 | ||
2c8c1e72 | 2680 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 2681 | { |
808f5114 | 2682 | spin_lock_init(&net->packet.sklist_lock); |
2aaef4e4 | 2683 | INIT_HLIST_HEAD(&net->packet.sklist); |
d12d01d6 DL |
2684 | |
2685 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) | |
2686 | return -ENOMEM; | |
2687 | ||
2688 | return 0; | |
2689 | } | |
2690 | ||
2c8c1e72 | 2691 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 DL |
2692 | { |
2693 | proc_net_remove(net, "packet"); | |
2694 | } | |
2695 | ||
2696 | static struct pernet_operations packet_net_ops = { | |
2697 | .init = packet_net_init, | |
2698 | .exit = packet_net_exit, | |
2699 | }; | |
2700 | ||
2701 | ||
1da177e4 LT |
2702 | static void __exit packet_exit(void) |
2703 | { | |
1da177e4 | 2704 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 2705 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
2706 | sock_unregister(PF_PACKET); |
2707 | proto_unregister(&packet_proto); | |
2708 | } | |
2709 | ||
2710 | static int __init packet_init(void) | |
2711 | { | |
2712 | int rc = proto_register(&packet_proto, 0); | |
2713 | ||
2714 | if (rc != 0) | |
2715 | goto out; | |
2716 | ||
2717 | sock_register(&packet_family_ops); | |
d12d01d6 | 2718 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 2719 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
2720 | out: |
2721 | return rc; | |
2722 | } | |
2723 | ||
2724 | module_init(packet_init); | |
2725 | module_exit(packet_exit); | |
2726 | MODULE_LICENSE("GPL"); | |
2727 | MODULE_ALIAS_NETPROTO(PF_PACKET); |