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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PACKET - implements raw packet sockets. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * | |
1ce4f28b | 12 | * Fixes: |
1da177e4 LT |
13 | * Alan Cox : verify_area() now used correctly |
14 | * Alan Cox : new skbuff lists, look ma no backlogs! | |
15 | * Alan Cox : tidied skbuff lists. | |
16 | * Alan Cox : Now uses generic datagram routines I | |
17 | * added. Also fixed the peek/read crash | |
18 | * from all old Linux datagram code. | |
19 | * Alan Cox : Uses the improved datagram code. | |
20 | * Alan Cox : Added NULL's for socket options. | |
21 | * Alan Cox : Re-commented the code. | |
22 | * Alan Cox : Use new kernel side addressing | |
23 | * Rob Janssen : Correct MTU usage. | |
24 | * Dave Platt : Counter leaks caused by incorrect | |
25 | * interrupt locking and some slightly | |
26 | * dubious gcc output. Can you read | |
27 | * compiler: it said _VOLATILE_ | |
28 | * Richard Kooijman : Timestamp fixes. | |
29 | * Alan Cox : New buffers. Use sk->mac.raw. | |
30 | * Alan Cox : sendmsg/recvmsg support. | |
31 | * Alan Cox : Protocol setting support | |
32 | * Alexey Kuznetsov : Untied from IPv4 stack. | |
33 | * Cyrus Durgin : Fixed kerneld for kmod. | |
34 | * Michal Ostrowski : Module initialization cleanup. | |
1ce4f28b | 35 | * Ulises Alonso : Frame number limit removal and |
1da177e4 | 36 | * packet_set_ring memory leak. |
0fb375fb EB |
37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
38 | * The convention is that longer addresses | |
39 | * will simply extend the hardware address | |
1ce4f28b | 40 | * byte arrays at the end of sockaddr_ll |
0fb375fb | 41 | * and packet_mreq. |
69e3c75f | 42 | * Johann Baudy : Added TX RING. |
1da177e4 LT |
43 | * |
44 | * This program is free software; you can redistribute it and/or | |
45 | * modify it under the terms of the GNU General Public License | |
46 | * as published by the Free Software Foundation; either version | |
47 | * 2 of the License, or (at your option) any later version. | |
48 | * | |
49 | */ | |
1ce4f28b | 50 | |
1da177e4 | 51 | #include <linux/types.h> |
1da177e4 | 52 | #include <linux/mm.h> |
4fc268d2 | 53 | #include <linux/capability.h> |
1da177e4 LT |
54 | #include <linux/fcntl.h> |
55 | #include <linux/socket.h> | |
56 | #include <linux/in.h> | |
57 | #include <linux/inet.h> | |
58 | #include <linux/netdevice.h> | |
59 | #include <linux/if_packet.h> | |
60 | #include <linux/wireless.h> | |
ffbc6111 | 61 | #include <linux/kernel.h> |
1da177e4 | 62 | #include <linux/kmod.h> |
5a0e3ad6 | 63 | #include <linux/slab.h> |
0e3125c7 | 64 | #include <linux/vmalloc.h> |
457c4cbc | 65 | #include <net/net_namespace.h> |
1da177e4 LT |
66 | #include <net/ip.h> |
67 | #include <net/protocol.h> | |
68 | #include <linux/skbuff.h> | |
69 | #include <net/sock.h> | |
70 | #include <linux/errno.h> | |
71 | #include <linux/timer.h> | |
72 | #include <asm/system.h> | |
73 | #include <asm/uaccess.h> | |
74 | #include <asm/ioctls.h> | |
75 | #include <asm/page.h> | |
a1f8e7f7 | 76 | #include <asm/cacheflush.h> |
1da177e4 LT |
77 | #include <asm/io.h> |
78 | #include <linux/proc_fs.h> | |
79 | #include <linux/seq_file.h> | |
80 | #include <linux/poll.h> | |
81 | #include <linux/module.h> | |
82 | #include <linux/init.h> | |
905db440 | 83 | #include <linux/mutex.h> |
05423b24 | 84 | #include <linux/if_vlan.h> |
bfd5f4a3 | 85 | #include <linux/virtio_net.h> |
ed85b565 | 86 | #include <linux/errqueue.h> |
614f60fa | 87 | #include <linux/net_tstamp.h> |
1da177e4 LT |
88 | |
89 | #ifdef CONFIG_INET | |
90 | #include <net/inet_common.h> | |
91 | #endif | |
92 | ||
1da177e4 LT |
93 | /* |
94 | Assumptions: | |
95 | - if device has no dev->hard_header routine, it adds and removes ll header | |
96 | inside itself. In this case ll header is invisible outside of device, | |
97 | but higher levels still should reserve dev->hard_header_len. | |
98 | Some devices are enough clever to reallocate skb, when header | |
99 | will not fit to reserved space (tunnel), another ones are silly | |
100 | (PPP). | |
101 | - packet socket receives packets with pulled ll header, | |
102 | so that SOCK_RAW should push it back. | |
103 | ||
104 | On receive: | |
105 | ----------- | |
106 | ||
107 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
108 | mac_header -> ll header |
109 | data -> data | |
1da177e4 LT |
110 | |
111 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
112 | mac_header -> ll header |
113 | data -> ll header | |
1da177e4 LT |
114 | |
115 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
116 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
117 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 118 | assymetry between rx and tx paths. |
b0e380b1 | 119 | data -> data |
1da177e4 LT |
120 | |
121 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
122 | mac_header -> data. ll header is still not built! |
123 | data -> data | |
1da177e4 LT |
124 | |
125 | Resume | |
126 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
127 | ||
128 | ||
129 | On transmit: | |
130 | ------------ | |
131 | ||
132 | dev->hard_header != NULL | |
b0e380b1 ACM |
133 | mac_header -> ll header |
134 | data -> ll header | |
1da177e4 LT |
135 | |
136 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
137 | mac_header -> data |
138 | data -> data | |
1da177e4 LT |
139 | |
140 | We should set nh.raw on output to correct posistion, | |
141 | packet classifier depends on it. | |
142 | */ | |
143 | ||
1da177e4 LT |
144 | /* Private packet socket structures. */ |
145 | ||
40d4e3df | 146 | struct packet_mclist { |
1da177e4 LT |
147 | struct packet_mclist *next; |
148 | int ifindex; | |
149 | int count; | |
150 | unsigned short type; | |
151 | unsigned short alen; | |
0fb375fb EB |
152 | unsigned char addr[MAX_ADDR_LEN]; |
153 | }; | |
154 | /* identical to struct packet_mreq except it has | |
155 | * a longer address field. | |
156 | */ | |
40d4e3df | 157 | struct packet_mreq_max { |
0fb375fb EB |
158 | int mr_ifindex; |
159 | unsigned short mr_type; | |
160 | unsigned short mr_alen; | |
161 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 162 | }; |
a2efcfa0 | 163 | |
69e3c75f JB |
164 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
165 | int closing, int tx_ring); | |
166 | ||
0e3125c7 NH |
167 | struct pgv { |
168 | char *buffer; | |
0e3125c7 NH |
169 | }; |
170 | ||
69e3c75f | 171 | struct packet_ring_buffer { |
0e3125c7 | 172 | struct pgv *pg_vec; |
69e3c75f JB |
173 | unsigned int head; |
174 | unsigned int frames_per_block; | |
175 | unsigned int frame_size; | |
176 | unsigned int frame_max; | |
177 | ||
178 | unsigned int pg_vec_order; | |
179 | unsigned int pg_vec_pages; | |
180 | unsigned int pg_vec_len; | |
181 | ||
182 | atomic_t pending; | |
183 | }; | |
184 | ||
185 | struct packet_sock; | |
186 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
1da177e4 LT |
187 | |
188 | static void packet_flush_mclist(struct sock *sk); | |
189 | ||
190 | struct packet_sock { | |
191 | /* struct sock has to be the first member of packet_sock */ | |
192 | struct sock sk; | |
193 | struct tpacket_stats stats; | |
69e3c75f JB |
194 | struct packet_ring_buffer rx_ring; |
195 | struct packet_ring_buffer tx_ring; | |
1da177e4 | 196 | int copy_thresh; |
1da177e4 | 197 | spinlock_t bind_lock; |
905db440 | 198 | struct mutex pg_vec_lock; |
8dc41944 | 199 | unsigned int running:1, /* prot_hook is attached*/ |
80feaacb | 200 | auxdata:1, |
bfd5f4a3 SS |
201 | origdev:1, |
202 | has_vnet_hdr:1; | |
1da177e4 | 203 | int ifindex; /* bound device */ |
0e11c91e | 204 | __be16 num; |
1da177e4 | 205 | struct packet_mclist *mclist; |
1da177e4 | 206 | atomic_t mapped; |
bbd6ef87 PM |
207 | enum tpacket_versions tp_version; |
208 | unsigned int tp_hdrlen; | |
8913336a | 209 | unsigned int tp_reserve; |
69e3c75f | 210 | unsigned int tp_loss:1; |
614f60fa | 211 | unsigned int tp_tstamp; |
94b05952 | 212 | struct packet_type prot_hook ____cacheline_aligned_in_smp; |
1da177e4 LT |
213 | }; |
214 | ||
ffbc6111 HX |
215 | struct packet_skb_cb { |
216 | unsigned int origlen; | |
217 | union { | |
218 | struct sockaddr_pkt pkt; | |
219 | struct sockaddr_ll ll; | |
220 | } sa; | |
221 | }; | |
222 | ||
223 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 224 | |
f6dafa95 | 225 | static inline __pure struct page *pgv_to_page(void *addr) |
0af55bb5 CG |
226 | { |
227 | if (is_vmalloc_addr(addr)) | |
228 | return vmalloc_to_page(addr); | |
229 | return virt_to_page(addr); | |
230 | } | |
231 | ||
69e3c75f | 232 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 233 | { |
bbd6ef87 PM |
234 | union { |
235 | struct tpacket_hdr *h1; | |
236 | struct tpacket2_hdr *h2; | |
237 | void *raw; | |
238 | } h; | |
1da177e4 | 239 | |
69e3c75f | 240 | h.raw = frame; |
bbd6ef87 PM |
241 | switch (po->tp_version) { |
242 | case TPACKET_V1: | |
69e3c75f | 243 | h.h1->tp_status = status; |
0af55bb5 | 244 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
bbd6ef87 PM |
245 | break; |
246 | case TPACKET_V2: | |
69e3c75f | 247 | h.h2->tp_status = status; |
0af55bb5 | 248 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
bbd6ef87 | 249 | break; |
69e3c75f | 250 | default: |
40d4e3df | 251 | pr_err("TPACKET version not supported\n"); |
69e3c75f | 252 | BUG(); |
bbd6ef87 | 253 | } |
69e3c75f JB |
254 | |
255 | smp_wmb(); | |
bbd6ef87 PM |
256 | } |
257 | ||
69e3c75f | 258 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 PM |
259 | { |
260 | union { | |
261 | struct tpacket_hdr *h1; | |
262 | struct tpacket2_hdr *h2; | |
263 | void *raw; | |
264 | } h; | |
265 | ||
69e3c75f JB |
266 | smp_rmb(); |
267 | ||
bbd6ef87 PM |
268 | h.raw = frame; |
269 | switch (po->tp_version) { | |
270 | case TPACKET_V1: | |
0af55bb5 | 271 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
69e3c75f | 272 | return h.h1->tp_status; |
bbd6ef87 | 273 | case TPACKET_V2: |
0af55bb5 | 274 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
69e3c75f JB |
275 | return h.h2->tp_status; |
276 | default: | |
40d4e3df | 277 | pr_err("TPACKET version not supported\n"); |
69e3c75f JB |
278 | BUG(); |
279 | return 0; | |
bbd6ef87 | 280 | } |
1da177e4 | 281 | } |
69e3c75f JB |
282 | |
283 | static void *packet_lookup_frame(struct packet_sock *po, | |
284 | struct packet_ring_buffer *rb, | |
285 | unsigned int position, | |
286 | int status) | |
287 | { | |
288 | unsigned int pg_vec_pos, frame_offset; | |
289 | union { | |
290 | struct tpacket_hdr *h1; | |
291 | struct tpacket2_hdr *h2; | |
292 | void *raw; | |
293 | } h; | |
294 | ||
295 | pg_vec_pos = position / rb->frames_per_block; | |
296 | frame_offset = position % rb->frames_per_block; | |
297 | ||
0e3125c7 NH |
298 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
299 | (frame_offset * rb->frame_size); | |
69e3c75f JB |
300 | |
301 | if (status != __packet_get_status(po, h.raw)) | |
302 | return NULL; | |
303 | ||
304 | return h.raw; | |
305 | } | |
306 | ||
307 | static inline void *packet_current_frame(struct packet_sock *po, | |
308 | struct packet_ring_buffer *rb, | |
309 | int status) | |
310 | { | |
311 | return packet_lookup_frame(po, rb, rb->head, status); | |
312 | } | |
313 | ||
314 | static inline void *packet_previous_frame(struct packet_sock *po, | |
315 | struct packet_ring_buffer *rb, | |
316 | int status) | |
317 | { | |
318 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
319 | return packet_lookup_frame(po, rb, previous, status); | |
320 | } | |
321 | ||
322 | static inline void packet_increment_head(struct packet_ring_buffer *buff) | |
323 | { | |
324 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
325 | } | |
326 | ||
1da177e4 LT |
327 | static inline struct packet_sock *pkt_sk(struct sock *sk) |
328 | { | |
329 | return (struct packet_sock *)sk; | |
330 | } | |
331 | ||
332 | static void packet_sock_destruct(struct sock *sk) | |
333 | { | |
ed85b565 RC |
334 | skb_queue_purge(&sk->sk_error_queue); |
335 | ||
547b792c IJ |
336 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
337 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
338 | |
339 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 340 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
341 | return; |
342 | } | |
343 | ||
17ab56a2 | 344 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
345 | } |
346 | ||
347 | ||
90ddc4f0 | 348 | static const struct proto_ops packet_ops; |
1da177e4 | 349 | |
90ddc4f0 | 350 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 351 | |
40d4e3df ED |
352 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
353 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
354 | { |
355 | struct sock *sk; | |
356 | struct sockaddr_pkt *spkt; | |
357 | ||
358 | /* | |
359 | * When we registered the protocol we saved the socket in the data | |
360 | * field for just this event. | |
361 | */ | |
362 | ||
363 | sk = pt->af_packet_priv; | |
1ce4f28b | 364 | |
1da177e4 LT |
365 | /* |
366 | * Yank back the headers [hope the device set this | |
367 | * right or kerboom...] | |
368 | * | |
369 | * Incoming packets have ll header pulled, | |
370 | * push it back. | |
371 | * | |
98e399f8 | 372 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
373 | * so that this procedure is noop. |
374 | */ | |
375 | ||
376 | if (skb->pkt_type == PACKET_LOOPBACK) | |
377 | goto out; | |
378 | ||
09ad9bc7 | 379 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
380 | goto out; |
381 | ||
40d4e3df ED |
382 | skb = skb_share_check(skb, GFP_ATOMIC); |
383 | if (skb == NULL) | |
1da177e4 LT |
384 | goto oom; |
385 | ||
386 | /* drop any routing info */ | |
adf30907 | 387 | skb_dst_drop(skb); |
1da177e4 | 388 | |
84531c24 PO |
389 | /* drop conntrack reference */ |
390 | nf_reset(skb); | |
391 | ||
ffbc6111 | 392 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 393 | |
98e399f8 | 394 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
395 | |
396 | /* | |
397 | * The SOCK_PACKET socket receives _all_ frames. | |
398 | */ | |
399 | ||
400 | spkt->spkt_family = dev->type; | |
401 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
402 | spkt->spkt_protocol = skb->protocol; | |
403 | ||
404 | /* | |
405 | * Charge the memory to the socket. This is done specifically | |
406 | * to prevent sockets using all the memory up. | |
407 | */ | |
408 | ||
40d4e3df | 409 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
410 | return 0; |
411 | ||
412 | out: | |
413 | kfree_skb(skb); | |
414 | oom: | |
415 | return 0; | |
416 | } | |
417 | ||
418 | ||
419 | /* | |
420 | * Output a raw packet to a device layer. This bypasses all the other | |
421 | * protocol layers and you must therefore supply it with a complete frame | |
422 | */ | |
1ce4f28b | 423 | |
1da177e4 LT |
424 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
425 | struct msghdr *msg, size_t len) | |
426 | { | |
427 | struct sock *sk = sock->sk; | |
40d4e3df | 428 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1a35ca80 | 429 | struct sk_buff *skb = NULL; |
1da177e4 | 430 | struct net_device *dev; |
40d4e3df | 431 | __be16 proto = 0; |
1da177e4 | 432 | int err; |
1ce4f28b | 433 | |
1da177e4 | 434 | /* |
1ce4f28b | 435 | * Get and verify the address. |
1da177e4 LT |
436 | */ |
437 | ||
40d4e3df | 438 | if (saddr) { |
1da177e4 | 439 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
440 | return -EINVAL; |
441 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
442 | proto = saddr->spkt_protocol; | |
443 | } else | |
444 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
445 | |
446 | /* | |
1ce4f28b | 447 | * Find the device first to size check it |
1da177e4 LT |
448 | */ |
449 | ||
450 | saddr->spkt_device[13] = 0; | |
1a35ca80 | 451 | retry: |
654d1f8a ED |
452 | rcu_read_lock(); |
453 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
454 | err = -ENODEV; |
455 | if (dev == NULL) | |
456 | goto out_unlock; | |
1ce4f28b | 457 | |
d5e76b0a DM |
458 | err = -ENETDOWN; |
459 | if (!(dev->flags & IFF_UP)) | |
460 | goto out_unlock; | |
461 | ||
1da177e4 | 462 | /* |
40d4e3df ED |
463 | * You may not queue a frame bigger than the mtu. This is the lowest level |
464 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 465 | */ |
1ce4f28b | 466 | |
1da177e4 | 467 | err = -EMSGSIZE; |
57f89bfa | 468 | if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN) |
1da177e4 LT |
469 | goto out_unlock; |
470 | ||
1a35ca80 ED |
471 | if (!skb) { |
472 | size_t reserved = LL_RESERVED_SPACE(dev); | |
473 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; | |
474 | ||
475 | rcu_read_unlock(); | |
476 | skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL); | |
477 | if (skb == NULL) | |
478 | return -ENOBUFS; | |
479 | /* FIXME: Save some space for broken drivers that write a hard | |
480 | * header at transmission time by themselves. PPP is the notable | |
481 | * one here. This should really be fixed at the driver level. | |
482 | */ | |
483 | skb_reserve(skb, reserved); | |
484 | skb_reset_network_header(skb); | |
485 | ||
486 | /* Try to align data part correctly */ | |
487 | if (hhlen) { | |
488 | skb->data -= hhlen; | |
489 | skb->tail -= hhlen; | |
490 | if (len < hhlen) | |
491 | skb_reset_network_header(skb); | |
492 | } | |
493 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
494 | if (err) | |
495 | goto out_free; | |
496 | goto retry; | |
1da177e4 LT |
497 | } |
498 | ||
57f89bfa BG |
499 | if (len > (dev->mtu + dev->hard_header_len)) { |
500 | /* Earlier code assumed this would be a VLAN pkt, | |
501 | * double-check this now that we have the actual | |
502 | * packet in hand. | |
503 | */ | |
504 | struct ethhdr *ehdr; | |
505 | skb_reset_mac_header(skb); | |
506 | ehdr = eth_hdr(skb); | |
507 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { | |
508 | err = -EMSGSIZE; | |
509 | goto out_unlock; | |
510 | } | |
511 | } | |
1a35ca80 | 512 | |
1da177e4 LT |
513 | skb->protocol = proto; |
514 | skb->dev = dev; | |
515 | skb->priority = sk->sk_priority; | |
2d37a186 | 516 | skb->mark = sk->sk_mark; |
2244d07b | 517 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ed85b565 RC |
518 | if (err < 0) |
519 | goto out_unlock; | |
1da177e4 LT |
520 | |
521 | dev_queue_xmit(skb); | |
654d1f8a | 522 | rcu_read_unlock(); |
40d4e3df | 523 | return len; |
1da177e4 | 524 | |
1da177e4 | 525 | out_unlock: |
654d1f8a | 526 | rcu_read_unlock(); |
1a35ca80 ED |
527 | out_free: |
528 | kfree_skb(skb); | |
1da177e4 LT |
529 | return err; |
530 | } | |
1da177e4 | 531 | |
62ab0812 ED |
532 | static inline unsigned int run_filter(const struct sk_buff *skb, |
533 | const struct sock *sk, | |
dbcb5855 | 534 | unsigned int res) |
1da177e4 LT |
535 | { |
536 | struct sk_filter *filter; | |
fda9ef5d | 537 | |
80f8f102 ED |
538 | rcu_read_lock(); |
539 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 | 540 | if (filter != NULL) |
0a14842f | 541 | res = SK_RUN_FILTER(filter, skb); |
80f8f102 | 542 | rcu_read_unlock(); |
1da177e4 | 543 | |
dbcb5855 | 544 | return res; |
1da177e4 LT |
545 | } |
546 | ||
547 | /* | |
62ab0812 ED |
548 | * This function makes lazy skb cloning in hope that most of packets |
549 | * are discarded by BPF. | |
550 | * | |
551 | * Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
552 | * and skb->cb are mangled. It works because (and until) packets | |
553 | * falling here are owned by current CPU. Output packets are cloned | |
554 | * by dev_queue_xmit_nit(), input packets are processed by net_bh | |
555 | * sequencially, so that if we return skb to original state on exit, | |
556 | * we will not harm anyone. | |
1da177e4 LT |
557 | */ |
558 | ||
40d4e3df ED |
559 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
560 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
561 | { |
562 | struct sock *sk; | |
563 | struct sockaddr_ll *sll; | |
564 | struct packet_sock *po; | |
40d4e3df | 565 | u8 *skb_head = skb->data; |
1da177e4 | 566 | int skb_len = skb->len; |
dbcb5855 | 567 | unsigned int snaplen, res; |
1da177e4 LT |
568 | |
569 | if (skb->pkt_type == PACKET_LOOPBACK) | |
570 | goto drop; | |
571 | ||
572 | sk = pt->af_packet_priv; | |
573 | po = pkt_sk(sk); | |
574 | ||
09ad9bc7 | 575 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
576 | goto drop; |
577 | ||
1da177e4 LT |
578 | skb->dev = dev; |
579 | ||
3b04ddde | 580 | if (dev->header_ops) { |
1da177e4 | 581 | /* The device has an explicit notion of ll header, |
62ab0812 ED |
582 | * exported to higher levels. |
583 | * | |
584 | * Otherwise, the device hides details of its frame | |
585 | * structure, so that corresponding packet head is | |
586 | * never delivered to user. | |
1da177e4 LT |
587 | */ |
588 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 589 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
590 | else if (skb->pkt_type == PACKET_OUTGOING) { |
591 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 592 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
593 | } |
594 | } | |
595 | ||
596 | snaplen = skb->len; | |
597 | ||
dbcb5855 DM |
598 | res = run_filter(skb, sk, snaplen); |
599 | if (!res) | |
fda9ef5d | 600 | goto drop_n_restore; |
dbcb5855 DM |
601 | if (snaplen > res) |
602 | snaplen = res; | |
1da177e4 LT |
603 | |
604 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
605 | (unsigned)sk->sk_rcvbuf) | |
606 | goto drop_n_acct; | |
607 | ||
608 | if (skb_shared(skb)) { | |
609 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
610 | if (nskb == NULL) | |
611 | goto drop_n_acct; | |
612 | ||
613 | if (skb_head != skb->data) { | |
614 | skb->data = skb_head; | |
615 | skb->len = skb_len; | |
616 | } | |
617 | kfree_skb(skb); | |
618 | skb = nskb; | |
619 | } | |
620 | ||
ffbc6111 HX |
621 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
622 | sizeof(skb->cb)); | |
623 | ||
624 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
625 | sll->sll_family = AF_PACKET; |
626 | sll->sll_hatype = dev->type; | |
627 | sll->sll_protocol = skb->protocol; | |
628 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 629 | if (unlikely(po->origdev)) |
80feaacb PWJ |
630 | sll->sll_ifindex = orig_dev->ifindex; |
631 | else | |
632 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 633 | |
b95cce35 | 634 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 635 | |
ffbc6111 | 636 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 637 | |
1da177e4 LT |
638 | if (pskb_trim(skb, snaplen)) |
639 | goto drop_n_acct; | |
640 | ||
641 | skb_set_owner_r(skb, sk); | |
642 | skb->dev = NULL; | |
adf30907 | 643 | skb_dst_drop(skb); |
1da177e4 | 644 | |
84531c24 PO |
645 | /* drop conntrack reference */ |
646 | nf_reset(skb); | |
647 | ||
1da177e4 LT |
648 | spin_lock(&sk->sk_receive_queue.lock); |
649 | po->stats.tp_packets++; | |
3b885787 | 650 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
651 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
652 | spin_unlock(&sk->sk_receive_queue.lock); | |
653 | sk->sk_data_ready(sk, skb->len); | |
654 | return 0; | |
655 | ||
656 | drop_n_acct: | |
3b885787 | 657 | po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
1da177e4 LT |
658 | |
659 | drop_n_restore: | |
660 | if (skb_head != skb->data && skb_shared(skb)) { | |
661 | skb->data = skb_head; | |
662 | skb->len = skb_len; | |
663 | } | |
664 | drop: | |
ead2ceb0 | 665 | consume_skb(skb); |
1da177e4 LT |
666 | return 0; |
667 | } | |
668 | ||
40d4e3df ED |
669 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
670 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
671 | { |
672 | struct sock *sk; | |
673 | struct packet_sock *po; | |
674 | struct sockaddr_ll *sll; | |
bbd6ef87 PM |
675 | union { |
676 | struct tpacket_hdr *h1; | |
677 | struct tpacket2_hdr *h2; | |
678 | void *raw; | |
679 | } h; | |
40d4e3df | 680 | u8 *skb_head = skb->data; |
1da177e4 | 681 | int skb_len = skb->len; |
dbcb5855 | 682 | unsigned int snaplen, res; |
1da177e4 | 683 | unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
bbd6ef87 | 684 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 685 | struct sk_buff *copy_skb = NULL; |
b7aa0bf7 | 686 | struct timeval tv; |
bbd6ef87 | 687 | struct timespec ts; |
614f60fa | 688 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
1da177e4 LT |
689 | |
690 | if (skb->pkt_type == PACKET_LOOPBACK) | |
691 | goto drop; | |
692 | ||
693 | sk = pt->af_packet_priv; | |
694 | po = pkt_sk(sk); | |
695 | ||
09ad9bc7 | 696 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
697 | goto drop; |
698 | ||
3b04ddde | 699 | if (dev->header_ops) { |
1da177e4 | 700 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 701 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
702 | else if (skb->pkt_type == PACKET_OUTGOING) { |
703 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 704 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
705 | } |
706 | } | |
707 | ||
8dc41944 HX |
708 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
709 | status |= TP_STATUS_CSUMNOTREADY; | |
710 | ||
1da177e4 LT |
711 | snaplen = skb->len; |
712 | ||
dbcb5855 DM |
713 | res = run_filter(skb, sk, snaplen); |
714 | if (!res) | |
fda9ef5d | 715 | goto drop_n_restore; |
dbcb5855 DM |
716 | if (snaplen > res) |
717 | snaplen = res; | |
1da177e4 LT |
718 | |
719 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
720 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
721 | po->tp_reserve; | |
1da177e4 | 722 | } else { |
bbe735e4 | 723 | unsigned maclen = skb_network_offset(skb); |
bbd6ef87 | 724 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
725 | (maclen < 16 ? 16 : maclen)) + |
726 | po->tp_reserve; | |
1da177e4 LT |
727 | macoff = netoff - maclen; |
728 | } | |
729 | ||
69e3c75f | 730 | if (macoff + snaplen > po->rx_ring.frame_size) { |
1da177e4 LT |
731 | if (po->copy_thresh && |
732 | atomic_read(&sk->sk_rmem_alloc) + skb->truesize < | |
733 | (unsigned)sk->sk_rcvbuf) { | |
734 | if (skb_shared(skb)) { | |
735 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
736 | } else { | |
737 | copy_skb = skb_get(skb); | |
738 | skb_head = skb->data; | |
739 | } | |
740 | if (copy_skb) | |
741 | skb_set_owner_r(copy_skb, sk); | |
742 | } | |
69e3c75f | 743 | snaplen = po->rx_ring.frame_size - macoff; |
1da177e4 LT |
744 | if ((int)snaplen < 0) |
745 | snaplen = 0; | |
746 | } | |
1da177e4 LT |
747 | |
748 | spin_lock(&sk->sk_receive_queue.lock); | |
69e3c75f | 749 | h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
bbd6ef87 | 750 | if (!h.raw) |
1da177e4 | 751 | goto ring_is_full; |
69e3c75f | 752 | packet_increment_head(&po->rx_ring); |
1da177e4 LT |
753 | po->stats.tp_packets++; |
754 | if (copy_skb) { | |
755 | status |= TP_STATUS_COPY; | |
756 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
757 | } | |
758 | if (!po->stats.tp_drops) | |
759 | status &= ~TP_STATUS_LOSING; | |
760 | spin_unlock(&sk->sk_receive_queue.lock); | |
761 | ||
bbd6ef87 | 762 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
1da177e4 | 763 | |
bbd6ef87 PM |
764 | switch (po->tp_version) { |
765 | case TPACKET_V1: | |
766 | h.h1->tp_len = skb->len; | |
767 | h.h1->tp_snaplen = snaplen; | |
768 | h.h1->tp_mac = macoff; | |
769 | h.h1->tp_net = netoff; | |
614f60fa SM |
770 | if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
771 | && shhwtstamps->syststamp.tv64) | |
772 | tv = ktime_to_timeval(shhwtstamps->syststamp); | |
773 | else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) | |
774 | && shhwtstamps->hwtstamp.tv64) | |
775 | tv = ktime_to_timeval(shhwtstamps->hwtstamp); | |
776 | else if (skb->tstamp.tv64) | |
bbd6ef87 PM |
777 | tv = ktime_to_timeval(skb->tstamp); |
778 | else | |
779 | do_gettimeofday(&tv); | |
780 | h.h1->tp_sec = tv.tv_sec; | |
781 | h.h1->tp_usec = tv.tv_usec; | |
782 | hdrlen = sizeof(*h.h1); | |
783 | break; | |
784 | case TPACKET_V2: | |
785 | h.h2->tp_len = skb->len; | |
786 | h.h2->tp_snaplen = snaplen; | |
787 | h.h2->tp_mac = macoff; | |
788 | h.h2->tp_net = netoff; | |
614f60fa SM |
789 | if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
790 | && shhwtstamps->syststamp.tv64) | |
791 | ts = ktime_to_timespec(shhwtstamps->syststamp); | |
792 | else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) | |
793 | && shhwtstamps->hwtstamp.tv64) | |
794 | ts = ktime_to_timespec(shhwtstamps->hwtstamp); | |
795 | else if (skb->tstamp.tv64) | |
bbd6ef87 PM |
796 | ts = ktime_to_timespec(skb->tstamp); |
797 | else | |
798 | getnstimeofday(&ts); | |
799 | h.h2->tp_sec = ts.tv_sec; | |
800 | h.h2->tp_nsec = ts.tv_nsec; | |
a3bcc23e BG |
801 | if (vlan_tx_tag_present(skb)) { |
802 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); | |
803 | status |= TP_STATUS_VLAN_VALID; | |
804 | } else { | |
805 | h.h2->tp_vlan_tci = 0; | |
806 | } | |
13fcb7bd | 807 | h.h2->tp_padding = 0; |
bbd6ef87 PM |
808 | hdrlen = sizeof(*h.h2); |
809 | break; | |
810 | default: | |
811 | BUG(); | |
812 | } | |
1da177e4 | 813 | |
bbd6ef87 | 814 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 815 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
816 | sll->sll_family = AF_PACKET; |
817 | sll->sll_hatype = dev->type; | |
818 | sll->sll_protocol = skb->protocol; | |
819 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 820 | if (unlikely(po->origdev)) |
80feaacb PWJ |
821 | sll->sll_ifindex = orig_dev->ifindex; |
822 | else | |
823 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 824 | |
bbd6ef87 | 825 | __packet_set_status(po, h.raw, status); |
e16aa207 | 826 | smp_mb(); |
f6dafa95 | 827 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
1da177e4 | 828 | { |
0af55bb5 CG |
829 | u8 *start, *end; |
830 | ||
831 | end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen); | |
832 | for (start = h.raw; start < end; start += PAGE_SIZE) | |
833 | flush_dcache_page(pgv_to_page(start)); | |
1da177e4 | 834 | } |
f6dafa95 | 835 | #endif |
1da177e4 LT |
836 | |
837 | sk->sk_data_ready(sk, 0); | |
838 | ||
839 | drop_n_restore: | |
840 | if (skb_head != skb->data && skb_shared(skb)) { | |
841 | skb->data = skb_head; | |
842 | skb->len = skb_len; | |
843 | } | |
844 | drop: | |
1ce4f28b | 845 | kfree_skb(skb); |
1da177e4 LT |
846 | return 0; |
847 | ||
848 | ring_is_full: | |
849 | po->stats.tp_drops++; | |
850 | spin_unlock(&sk->sk_receive_queue.lock); | |
851 | ||
852 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 853 | kfree_skb(copy_skb); |
1da177e4 LT |
854 | goto drop_n_restore; |
855 | } | |
856 | ||
69e3c75f JB |
857 | static void tpacket_destruct_skb(struct sk_buff *skb) |
858 | { | |
859 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 860 | void *ph; |
1da177e4 | 861 | |
69e3c75f | 862 | BUG_ON(skb == NULL); |
1da177e4 | 863 | |
69e3c75f JB |
864 | if (likely(po->tx_ring.pg_vec)) { |
865 | ph = skb_shinfo(skb)->destructor_arg; | |
866 | BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); | |
867 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); | |
868 | atomic_dec(&po->tx_ring.pending); | |
869 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE); | |
870 | } | |
871 | ||
872 | sock_wfree(skb); | |
873 | } | |
874 | ||
40d4e3df ED |
875 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
876 | void *frame, struct net_device *dev, int size_max, | |
877 | __be16 proto, unsigned char *addr) | |
69e3c75f JB |
878 | { |
879 | union { | |
880 | struct tpacket_hdr *h1; | |
881 | struct tpacket2_hdr *h2; | |
882 | void *raw; | |
883 | } ph; | |
884 | int to_write, offset, len, tp_len, nr_frags, len_max; | |
885 | struct socket *sock = po->sk.sk_socket; | |
886 | struct page *page; | |
887 | void *data; | |
888 | int err; | |
889 | ||
890 | ph.raw = frame; | |
891 | ||
892 | skb->protocol = proto; | |
893 | skb->dev = dev; | |
894 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 895 | skb->mark = po->sk.sk_mark; |
69e3c75f JB |
896 | skb_shinfo(skb)->destructor_arg = ph.raw; |
897 | ||
898 | switch (po->tp_version) { | |
899 | case TPACKET_V2: | |
900 | tp_len = ph.h2->tp_len; | |
901 | break; | |
902 | default: | |
903 | tp_len = ph.h1->tp_len; | |
904 | break; | |
905 | } | |
906 | if (unlikely(tp_len > size_max)) { | |
40d4e3df | 907 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
69e3c75f JB |
908 | return -EMSGSIZE; |
909 | } | |
910 | ||
911 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
912 | skb_reset_network_header(skb); | |
913 | ||
914 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
915 | to_write = tp_len; | |
916 | ||
917 | if (sock->type == SOCK_DGRAM) { | |
918 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
919 | NULL, tp_len); | |
920 | if (unlikely(err < 0)) | |
921 | return -EINVAL; | |
40d4e3df | 922 | } else if (dev->hard_header_len) { |
69e3c75f JB |
923 | /* net device doesn't like empty head */ |
924 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
925 | pr_err("packet size is too short (%d < %d)\n", |
926 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
927 | return -EINVAL; |
928 | } | |
929 | ||
930 | skb_push(skb, dev->hard_header_len); | |
931 | err = skb_store_bits(skb, 0, data, | |
932 | dev->hard_header_len); | |
933 | if (unlikely(err)) | |
934 | return err; | |
935 | ||
936 | data += dev->hard_header_len; | |
937 | to_write -= dev->hard_header_len; | |
938 | } | |
939 | ||
940 | err = -EFAULT; | |
69e3c75f JB |
941 | offset = offset_in_page(data); |
942 | len_max = PAGE_SIZE - offset; | |
943 | len = ((to_write > len_max) ? len_max : to_write); | |
944 | ||
945 | skb->data_len = to_write; | |
946 | skb->len += to_write; | |
947 | skb->truesize += to_write; | |
948 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
949 | ||
950 | while (likely(to_write)) { | |
951 | nr_frags = skb_shinfo(skb)->nr_frags; | |
952 | ||
953 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
954 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
955 | MAX_SKB_FRAGS); | |
69e3c75f JB |
956 | return -EFAULT; |
957 | } | |
958 | ||
0af55bb5 CG |
959 | page = pgv_to_page(data); |
960 | data += len; | |
69e3c75f JB |
961 | flush_dcache_page(page); |
962 | get_page(page); | |
0af55bb5 | 963 | skb_fill_page_desc(skb, nr_frags, page, offset, len); |
69e3c75f JB |
964 | to_write -= len; |
965 | offset = 0; | |
966 | len_max = PAGE_SIZE; | |
967 | len = ((to_write > len_max) ? len_max : to_write); | |
968 | } | |
969 | ||
970 | return tp_len; | |
971 | } | |
972 | ||
973 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
974 | { | |
69e3c75f JB |
975 | struct sk_buff *skb; |
976 | struct net_device *dev; | |
977 | __be16 proto; | |
827d9780 BG |
978 | bool need_rls_dev = false; |
979 | int err, reserve = 0; | |
40d4e3df ED |
980 | void *ph; |
981 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
982 | int tp_len, size_max; |
983 | unsigned char *addr; | |
984 | int len_sum = 0; | |
985 | int status = 0; | |
986 | ||
69e3c75f JB |
987 | mutex_lock(&po->pg_vec_lock); |
988 | ||
989 | err = -EBUSY; | |
990 | if (saddr == NULL) { | |
827d9780 | 991 | dev = po->prot_hook.dev; |
69e3c75f JB |
992 | proto = po->num; |
993 | addr = NULL; | |
994 | } else { | |
995 | err = -EINVAL; | |
996 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
997 | goto out; | |
998 | if (msg->msg_namelen < (saddr->sll_halen | |
999 | + offsetof(struct sockaddr_ll, | |
1000 | sll_addr))) | |
1001 | goto out; | |
69e3c75f JB |
1002 | proto = saddr->sll_protocol; |
1003 | addr = saddr->sll_addr; | |
827d9780 BG |
1004 | dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
1005 | need_rls_dev = true; | |
69e3c75f JB |
1006 | } |
1007 | ||
69e3c75f JB |
1008 | err = -ENXIO; |
1009 | if (unlikely(dev == NULL)) | |
1010 | goto out; | |
1011 | ||
1012 | reserve = dev->hard_header_len; | |
1013 | ||
1014 | err = -ENETDOWN; | |
1015 | if (unlikely(!(dev->flags & IFF_UP))) | |
1016 | goto out_put; | |
1017 | ||
1018 | size_max = po->tx_ring.frame_size | |
b5dd884e | 1019 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f JB |
1020 | |
1021 | if (size_max > dev->mtu + reserve) | |
1022 | size_max = dev->mtu + reserve; | |
1023 | ||
1024 | do { | |
1025 | ph = packet_current_frame(po, &po->tx_ring, | |
1026 | TP_STATUS_SEND_REQUEST); | |
1027 | ||
1028 | if (unlikely(ph == NULL)) { | |
1029 | schedule(); | |
1030 | continue; | |
1031 | } | |
1032 | ||
1033 | status = TP_STATUS_SEND_REQUEST; | |
1034 | skb = sock_alloc_send_skb(&po->sk, | |
1035 | LL_ALLOCATED_SPACE(dev) | |
1036 | + sizeof(struct sockaddr_ll), | |
1037 | 0, &err); | |
1038 | ||
1039 | if (unlikely(skb == NULL)) | |
1040 | goto out_status; | |
1041 | ||
1042 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
1043 | addr); | |
1044 | ||
1045 | if (unlikely(tp_len < 0)) { | |
1046 | if (po->tp_loss) { | |
1047 | __packet_set_status(po, ph, | |
1048 | TP_STATUS_AVAILABLE); | |
1049 | packet_increment_head(&po->tx_ring); | |
1050 | kfree_skb(skb); | |
1051 | continue; | |
1052 | } else { | |
1053 | status = TP_STATUS_WRONG_FORMAT; | |
1054 | err = tp_len; | |
1055 | goto out_status; | |
1056 | } | |
1057 | } | |
1058 | ||
1059 | skb->destructor = tpacket_destruct_skb; | |
1060 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
1061 | atomic_inc(&po->tx_ring.pending); | |
1062 | ||
1063 | status = TP_STATUS_SEND_REQUEST; | |
1064 | err = dev_queue_xmit(skb); | |
eb70df13 JP |
1065 | if (unlikely(err > 0)) { |
1066 | err = net_xmit_errno(err); | |
1067 | if (err && __packet_get_status(po, ph) == | |
1068 | TP_STATUS_AVAILABLE) { | |
1069 | /* skb was destructed already */ | |
1070 | skb = NULL; | |
1071 | goto out_status; | |
1072 | } | |
1073 | /* | |
1074 | * skb was dropped but not destructed yet; | |
1075 | * let's treat it like congestion or err < 0 | |
1076 | */ | |
1077 | err = 0; | |
1078 | } | |
69e3c75f JB |
1079 | packet_increment_head(&po->tx_ring); |
1080 | len_sum += tp_len; | |
f64f9e71 JP |
1081 | } while (likely((ph != NULL) || |
1082 | ((!(msg->msg_flags & MSG_DONTWAIT)) && | |
1083 | (atomic_read(&po->tx_ring.pending)))) | |
1084 | ); | |
69e3c75f JB |
1085 | |
1086 | err = len_sum; | |
1087 | goto out_put; | |
1088 | ||
69e3c75f JB |
1089 | out_status: |
1090 | __packet_set_status(po, ph, status); | |
1091 | kfree_skb(skb); | |
1092 | out_put: | |
827d9780 BG |
1093 | if (need_rls_dev) |
1094 | dev_put(dev); | |
69e3c75f JB |
1095 | out: |
1096 | mutex_unlock(&po->pg_vec_lock); | |
1097 | return err; | |
1098 | } | |
69e3c75f | 1099 | |
bfd5f4a3 SS |
1100 | static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
1101 | size_t reserve, size_t len, | |
1102 | size_t linear, int noblock, | |
1103 | int *err) | |
1104 | { | |
1105 | struct sk_buff *skb; | |
1106 | ||
1107 | /* Under a page? Don't bother with paged skb. */ | |
1108 | if (prepad + len < PAGE_SIZE || !linear) | |
1109 | linear = len; | |
1110 | ||
1111 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
1112 | err); | |
1113 | if (!skb) | |
1114 | return NULL; | |
1115 | ||
1116 | skb_reserve(skb, reserve); | |
1117 | skb_put(skb, linear); | |
1118 | skb->data_len = len - linear; | |
1119 | skb->len += len - linear; | |
1120 | ||
1121 | return skb; | |
1122 | } | |
1123 | ||
69e3c75f | 1124 | static int packet_snd(struct socket *sock, |
1da177e4 LT |
1125 | struct msghdr *msg, size_t len) |
1126 | { | |
1127 | struct sock *sk = sock->sk; | |
40d4e3df | 1128 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
1129 | struct sk_buff *skb; |
1130 | struct net_device *dev; | |
0e11c91e | 1131 | __be16 proto; |
827d9780 | 1132 | bool need_rls_dev = false; |
1da177e4 | 1133 | unsigned char *addr; |
827d9780 | 1134 | int err, reserve = 0; |
bfd5f4a3 SS |
1135 | struct virtio_net_hdr vnet_hdr = { 0 }; |
1136 | int offset = 0; | |
1137 | int vnet_hdr_len; | |
1138 | struct packet_sock *po = pkt_sk(sk); | |
1139 | unsigned short gso_type = 0; | |
1da177e4 LT |
1140 | |
1141 | /* | |
1ce4f28b | 1142 | * Get and verify the address. |
1da177e4 | 1143 | */ |
1ce4f28b | 1144 | |
1da177e4 | 1145 | if (saddr == NULL) { |
827d9780 | 1146 | dev = po->prot_hook.dev; |
1da177e4 LT |
1147 | proto = po->num; |
1148 | addr = NULL; | |
1149 | } else { | |
1150 | err = -EINVAL; | |
1151 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
1152 | goto out; | |
0fb375fb EB |
1153 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
1154 | goto out; | |
1da177e4 LT |
1155 | proto = saddr->sll_protocol; |
1156 | addr = saddr->sll_addr; | |
827d9780 BG |
1157 | dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
1158 | need_rls_dev = true; | |
1da177e4 LT |
1159 | } |
1160 | ||
1da177e4 LT |
1161 | err = -ENXIO; |
1162 | if (dev == NULL) | |
1163 | goto out_unlock; | |
1164 | if (sock->type == SOCK_RAW) | |
1165 | reserve = dev->hard_header_len; | |
1166 | ||
d5e76b0a DM |
1167 | err = -ENETDOWN; |
1168 | if (!(dev->flags & IFF_UP)) | |
1169 | goto out_unlock; | |
1170 | ||
bfd5f4a3 SS |
1171 | if (po->has_vnet_hdr) { |
1172 | vnet_hdr_len = sizeof(vnet_hdr); | |
1173 | ||
1174 | err = -EINVAL; | |
1175 | if (len < vnet_hdr_len) | |
1176 | goto out_unlock; | |
1177 | ||
1178 | len -= vnet_hdr_len; | |
1179 | ||
1180 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, | |
1181 | vnet_hdr_len); | |
1182 | if (err < 0) | |
1183 | goto out_unlock; | |
1184 | ||
1185 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
1186 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
1187 | vnet_hdr.hdr_len)) | |
1188 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
1189 | vnet_hdr.csum_offset + 2; | |
1190 | ||
1191 | err = -EINVAL; | |
1192 | if (vnet_hdr.hdr_len > len) | |
1193 | goto out_unlock; | |
1194 | ||
1195 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
1196 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1197 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
1198 | gso_type = SKB_GSO_TCPV4; | |
1199 | break; | |
1200 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
1201 | gso_type = SKB_GSO_TCPV6; | |
1202 | break; | |
1203 | case VIRTIO_NET_HDR_GSO_UDP: | |
1204 | gso_type = SKB_GSO_UDP; | |
1205 | break; | |
1206 | default: | |
1207 | goto out_unlock; | |
1208 | } | |
1209 | ||
1210 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
1211 | gso_type |= SKB_GSO_TCP_ECN; | |
1212 | ||
1213 | if (vnet_hdr.gso_size == 0) | |
1214 | goto out_unlock; | |
1215 | ||
1216 | } | |
1217 | } | |
1218 | ||
1da177e4 | 1219 | err = -EMSGSIZE; |
57f89bfa | 1220 | if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN)) |
1da177e4 LT |
1221 | goto out_unlock; |
1222 | ||
bfd5f4a3 SS |
1223 | err = -ENOBUFS; |
1224 | skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev), | |
1225 | LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len, | |
1226 | msg->msg_flags & MSG_DONTWAIT, &err); | |
40d4e3df | 1227 | if (skb == NULL) |
1da177e4 LT |
1228 | goto out_unlock; |
1229 | ||
bfd5f4a3 | 1230 | skb_set_network_header(skb, reserve); |
1da177e4 | 1231 | |
0c4e8581 SH |
1232 | err = -EINVAL; |
1233 | if (sock->type == SOCK_DGRAM && | |
bfd5f4a3 | 1234 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
0c4e8581 | 1235 | goto out_free; |
1da177e4 LT |
1236 | |
1237 | /* Returns -EFAULT on error */ | |
bfd5f4a3 | 1238 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
1da177e4 LT |
1239 | if (err) |
1240 | goto out_free; | |
2244d07b | 1241 | err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
ed85b565 RC |
1242 | if (err < 0) |
1243 | goto out_free; | |
1da177e4 | 1244 | |
57f89bfa BG |
1245 | if (!gso_type && (len > dev->mtu + reserve)) { |
1246 | /* Earlier code assumed this would be a VLAN pkt, | |
1247 | * double-check this now that we have the actual | |
1248 | * packet in hand. | |
1249 | */ | |
1250 | struct ethhdr *ehdr; | |
1251 | skb_reset_mac_header(skb); | |
1252 | ehdr = eth_hdr(skb); | |
1253 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { | |
1254 | err = -EMSGSIZE; | |
1255 | goto out_free; | |
1256 | } | |
1257 | } | |
1258 | ||
1da177e4 LT |
1259 | skb->protocol = proto; |
1260 | skb->dev = dev; | |
1261 | skb->priority = sk->sk_priority; | |
2d37a186 | 1262 | skb->mark = sk->sk_mark; |
1da177e4 | 1263 | |
bfd5f4a3 SS |
1264 | if (po->has_vnet_hdr) { |
1265 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
1266 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, | |
1267 | vnet_hdr.csum_offset)) { | |
1268 | err = -EINVAL; | |
1269 | goto out_free; | |
1270 | } | |
1271 | } | |
1272 | ||
1273 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; | |
1274 | skb_shinfo(skb)->gso_type = gso_type; | |
1275 | ||
1276 | /* Header must be checked, and gso_segs computed. */ | |
1277 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1278 | skb_shinfo(skb)->gso_segs = 0; | |
1279 | ||
1280 | len += vnet_hdr_len; | |
1281 | } | |
1282 | ||
1da177e4 LT |
1283 | /* |
1284 | * Now send it | |
1285 | */ | |
1286 | ||
1287 | err = dev_queue_xmit(skb); | |
1288 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
1289 | goto out_unlock; | |
1290 | ||
827d9780 BG |
1291 | if (need_rls_dev) |
1292 | dev_put(dev); | |
1da177e4 | 1293 | |
40d4e3df | 1294 | return len; |
1da177e4 LT |
1295 | |
1296 | out_free: | |
1297 | kfree_skb(skb); | |
1298 | out_unlock: | |
827d9780 | 1299 | if (dev && need_rls_dev) |
1da177e4 LT |
1300 | dev_put(dev); |
1301 | out: | |
1302 | return err; | |
1303 | } | |
1304 | ||
69e3c75f JB |
1305 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
1306 | struct msghdr *msg, size_t len) | |
1307 | { | |
69e3c75f JB |
1308 | struct sock *sk = sock->sk; |
1309 | struct packet_sock *po = pkt_sk(sk); | |
1310 | if (po->tx_ring.pg_vec) | |
1311 | return tpacket_snd(po, msg); | |
1312 | else | |
69e3c75f JB |
1313 | return packet_snd(sock, msg, len); |
1314 | } | |
1315 | ||
1da177e4 LT |
1316 | /* |
1317 | * Close a PACKET socket. This is fairly simple. We immediately go | |
1318 | * to 'closed' state and remove our protocol entry in the device list. | |
1319 | */ | |
1320 | ||
1321 | static int packet_release(struct socket *sock) | |
1322 | { | |
1323 | struct sock *sk = sock->sk; | |
1324 | struct packet_sock *po; | |
d12d01d6 | 1325 | struct net *net; |
69e3c75f | 1326 | struct tpacket_req req; |
1da177e4 LT |
1327 | |
1328 | if (!sk) | |
1329 | return 0; | |
1330 | ||
3b1e0a65 | 1331 | net = sock_net(sk); |
1da177e4 LT |
1332 | po = pkt_sk(sk); |
1333 | ||
808f5114 | 1334 | spin_lock_bh(&net->packet.sklist_lock); |
1335 | sk_del_node_init_rcu(sk); | |
920de804 | 1336 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
808f5114 | 1337 | spin_unlock_bh(&net->packet.sklist_lock); |
1da177e4 | 1338 | |
808f5114 | 1339 | spin_lock(&po->bind_lock); |
1da177e4 LT |
1340 | if (po->running) { |
1341 | /* | |
808f5114 | 1342 | * Remove from protocol table |
1da177e4 | 1343 | */ |
1da177e4 LT |
1344 | po->running = 0; |
1345 | po->num = 0; | |
808f5114 | 1346 | __dev_remove_pack(&po->prot_hook); |
1da177e4 LT |
1347 | __sock_put(sk); |
1348 | } | |
160ff18a BG |
1349 | if (po->prot_hook.dev) { |
1350 | dev_put(po->prot_hook.dev); | |
1351 | po->prot_hook.dev = NULL; | |
1352 | } | |
808f5114 | 1353 | spin_unlock(&po->bind_lock); |
1da177e4 | 1354 | |
1da177e4 | 1355 | packet_flush_mclist(sk); |
1da177e4 | 1356 | |
69e3c75f JB |
1357 | memset(&req, 0, sizeof(req)); |
1358 | ||
1359 | if (po->rx_ring.pg_vec) | |
1360 | packet_set_ring(sk, &req, 1, 0); | |
1361 | ||
1362 | if (po->tx_ring.pg_vec) | |
1363 | packet_set_ring(sk, &req, 1, 1); | |
1da177e4 | 1364 | |
808f5114 | 1365 | synchronize_net(); |
1da177e4 LT |
1366 | /* |
1367 | * Now the socket is dead. No more input will appear. | |
1368 | */ | |
1da177e4 LT |
1369 | sock_orphan(sk); |
1370 | sock->sk = NULL; | |
1371 | ||
1372 | /* Purge queues */ | |
1373 | ||
1374 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 1375 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1376 | |
1377 | sock_put(sk); | |
1378 | return 0; | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * Attach a packet hook. | |
1383 | */ | |
1384 | ||
0e11c91e | 1385 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
1386 | { |
1387 | struct packet_sock *po = pkt_sk(sk); | |
1388 | /* | |
1389 | * Detach an existing hook if present. | |
1390 | */ | |
1391 | ||
1392 | lock_sock(sk); | |
1393 | ||
1394 | spin_lock(&po->bind_lock); | |
1395 | if (po->running) { | |
1396 | __sock_put(sk); | |
1397 | po->running = 0; | |
1398 | po->num = 0; | |
1399 | spin_unlock(&po->bind_lock); | |
1400 | dev_remove_pack(&po->prot_hook); | |
1401 | spin_lock(&po->bind_lock); | |
1402 | } | |
1403 | ||
1404 | po->num = protocol; | |
1405 | po->prot_hook.type = protocol; | |
160ff18a BG |
1406 | if (po->prot_hook.dev) |
1407 | dev_put(po->prot_hook.dev); | |
1da177e4 LT |
1408 | po->prot_hook.dev = dev; |
1409 | ||
1410 | po->ifindex = dev ? dev->ifindex : 0; | |
1411 | ||
1412 | if (protocol == 0) | |
1413 | goto out_unlock; | |
1414 | ||
be85d4ad | 1415 | if (!dev || (dev->flags & IFF_UP)) { |
1da177e4 LT |
1416 | dev_add_pack(&po->prot_hook); |
1417 | sock_hold(sk); | |
1418 | po->running = 1; | |
be85d4ad UT |
1419 | } else { |
1420 | sk->sk_err = ENETDOWN; | |
1421 | if (!sock_flag(sk, SOCK_DEAD)) | |
1422 | sk->sk_error_report(sk); | |
1da177e4 LT |
1423 | } |
1424 | ||
1425 | out_unlock: | |
1426 | spin_unlock(&po->bind_lock); | |
1427 | release_sock(sk); | |
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | * Bind a packet socket to a device | |
1433 | */ | |
1434 | ||
40d4e3df ED |
1435 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
1436 | int addr_len) | |
1da177e4 | 1437 | { |
40d4e3df | 1438 | struct sock *sk = sock->sk; |
1da177e4 LT |
1439 | char name[15]; |
1440 | struct net_device *dev; | |
1441 | int err = -ENODEV; | |
1ce4f28b | 1442 | |
1da177e4 LT |
1443 | /* |
1444 | * Check legality | |
1445 | */ | |
1ce4f28b | 1446 | |
8ae55f04 | 1447 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 1448 | return -EINVAL; |
40d4e3df | 1449 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 1450 | |
3b1e0a65 | 1451 | dev = dev_get_by_name(sock_net(sk), name); |
160ff18a | 1452 | if (dev) |
1da177e4 | 1453 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
1da177e4 LT |
1454 | return err; |
1455 | } | |
1da177e4 LT |
1456 | |
1457 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1458 | { | |
40d4e3df ED |
1459 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
1460 | struct sock *sk = sock->sk; | |
1da177e4 LT |
1461 | struct net_device *dev = NULL; |
1462 | int err; | |
1463 | ||
1464 | ||
1465 | /* | |
1466 | * Check legality | |
1467 | */ | |
1ce4f28b | 1468 | |
1da177e4 LT |
1469 | if (addr_len < sizeof(struct sockaddr_ll)) |
1470 | return -EINVAL; | |
1471 | if (sll->sll_family != AF_PACKET) | |
1472 | return -EINVAL; | |
1473 | ||
1474 | if (sll->sll_ifindex) { | |
1475 | err = -ENODEV; | |
3b1e0a65 | 1476 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
1477 | if (dev == NULL) |
1478 | goto out; | |
1479 | } | |
1480 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1da177e4 LT |
1481 | |
1482 | out: | |
1483 | return err; | |
1484 | } | |
1485 | ||
1486 | static struct proto packet_proto = { | |
1487 | .name = "PACKET", | |
1488 | .owner = THIS_MODULE, | |
1489 | .obj_size = sizeof(struct packet_sock), | |
1490 | }; | |
1491 | ||
1492 | /* | |
1ce4f28b | 1493 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
1494 | */ |
1495 | ||
3f378b68 EP |
1496 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
1497 | int kern) | |
1da177e4 LT |
1498 | { |
1499 | struct sock *sk; | |
1500 | struct packet_sock *po; | |
0e11c91e | 1501 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
1502 | int err; |
1503 | ||
1504 | if (!capable(CAP_NET_RAW)) | |
1505 | return -EPERM; | |
be02097c DM |
1506 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
1507 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
1508 | return -ESOCKTNOSUPPORT; |
1509 | ||
1510 | sock->state = SS_UNCONNECTED; | |
1511 | ||
1512 | err = -ENOBUFS; | |
6257ff21 | 1513 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
1514 | if (sk == NULL) |
1515 | goto out; | |
1516 | ||
1517 | sock->ops = &packet_ops; | |
1da177e4 LT |
1518 | if (sock->type == SOCK_PACKET) |
1519 | sock->ops = &packet_ops_spkt; | |
be02097c | 1520 | |
1da177e4 LT |
1521 | sock_init_data(sock, sk); |
1522 | ||
1523 | po = pkt_sk(sk); | |
1524 | sk->sk_family = PF_PACKET; | |
0e11c91e | 1525 | po->num = proto; |
1da177e4 LT |
1526 | |
1527 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 1528 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
1529 | |
1530 | /* | |
1531 | * Attach a protocol block | |
1532 | */ | |
1533 | ||
1534 | spin_lock_init(&po->bind_lock); | |
905db440 | 1535 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 1536 | po->prot_hook.func = packet_rcv; |
be02097c | 1537 | |
1da177e4 LT |
1538 | if (sock->type == SOCK_PACKET) |
1539 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 1540 | |
1da177e4 LT |
1541 | po->prot_hook.af_packet_priv = sk; |
1542 | ||
0e11c91e AV |
1543 | if (proto) { |
1544 | po->prot_hook.type = proto; | |
1da177e4 LT |
1545 | dev_add_pack(&po->prot_hook); |
1546 | sock_hold(sk); | |
1547 | po->running = 1; | |
1548 | } | |
1549 | ||
808f5114 | 1550 | spin_lock_bh(&net->packet.sklist_lock); |
1551 | sk_add_node_rcu(sk, &net->packet.sklist); | |
3680453c | 1552 | sock_prot_inuse_add(net, &packet_proto, 1); |
808f5114 | 1553 | spin_unlock_bh(&net->packet.sklist_lock); |
1554 | ||
40d4e3df | 1555 | return 0; |
1da177e4 LT |
1556 | out: |
1557 | return err; | |
1558 | } | |
1559 | ||
ed85b565 RC |
1560 | static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len) |
1561 | { | |
1562 | struct sock_exterr_skb *serr; | |
1563 | struct sk_buff *skb, *skb2; | |
1564 | int copied, err; | |
1565 | ||
1566 | err = -EAGAIN; | |
1567 | skb = skb_dequeue(&sk->sk_error_queue); | |
1568 | if (skb == NULL) | |
1569 | goto out; | |
1570 | ||
1571 | copied = skb->len; | |
1572 | if (copied > len) { | |
1573 | msg->msg_flags |= MSG_TRUNC; | |
1574 | copied = len; | |
1575 | } | |
1576 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1577 | if (err) | |
1578 | goto out_free_skb; | |
1579 | ||
1580 | sock_recv_timestamp(msg, sk, skb); | |
1581 | ||
1582 | serr = SKB_EXT_ERR(skb); | |
1583 | put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP, | |
1584 | sizeof(serr->ee), &serr->ee); | |
1585 | ||
1586 | msg->msg_flags |= MSG_ERRQUEUE; | |
1587 | err = copied; | |
1588 | ||
1589 | /* Reset and regenerate socket error */ | |
1590 | spin_lock_bh(&sk->sk_error_queue.lock); | |
1591 | sk->sk_err = 0; | |
1592 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
1593 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
1594 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1595 | sk->sk_error_report(sk); | |
1596 | } else | |
1597 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
1598 | ||
1599 | out_free_skb: | |
1600 | kfree_skb(skb); | |
1601 | out: | |
1602 | return err; | |
1603 | } | |
1604 | ||
1da177e4 LT |
1605 | /* |
1606 | * Pull a packet from our receive queue and hand it to the user. | |
1607 | * If necessary we block. | |
1608 | */ | |
1609 | ||
1610 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1611 | struct msghdr *msg, size_t len, int flags) | |
1612 | { | |
1613 | struct sock *sk = sock->sk; | |
1614 | struct sk_buff *skb; | |
1615 | int copied, err; | |
0fb375fb | 1616 | struct sockaddr_ll *sll; |
bfd5f4a3 | 1617 | int vnet_hdr_len = 0; |
1da177e4 LT |
1618 | |
1619 | err = -EINVAL; | |
ed85b565 | 1620 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
1da177e4 LT |
1621 | goto out; |
1622 | ||
1623 | #if 0 | |
1624 | /* What error should we return now? EUNATTACH? */ | |
1625 | if (pkt_sk(sk)->ifindex < 0) | |
1626 | return -ENODEV; | |
1627 | #endif | |
1628 | ||
ed85b565 RC |
1629 | if (flags & MSG_ERRQUEUE) { |
1630 | err = packet_recv_error(sk, msg, len); | |
1631 | goto out; | |
1632 | } | |
1633 | ||
1da177e4 LT |
1634 | /* |
1635 | * Call the generic datagram receiver. This handles all sorts | |
1636 | * of horrible races and re-entrancy so we can forget about it | |
1637 | * in the protocol layers. | |
1638 | * | |
1639 | * Now it will return ENETDOWN, if device have just gone down, | |
1640 | * but then it will block. | |
1641 | */ | |
1642 | ||
40d4e3df | 1643 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
1644 | |
1645 | /* | |
1ce4f28b | 1646 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
1647 | * handles the blocking we don't see and worry about blocking |
1648 | * retries. | |
1649 | */ | |
1650 | ||
8ae55f04 | 1651 | if (skb == NULL) |
1da177e4 LT |
1652 | goto out; |
1653 | ||
bfd5f4a3 SS |
1654 | if (pkt_sk(sk)->has_vnet_hdr) { |
1655 | struct virtio_net_hdr vnet_hdr = { 0 }; | |
1656 | ||
1657 | err = -EINVAL; | |
1658 | vnet_hdr_len = sizeof(vnet_hdr); | |
1f18b717 | 1659 | if (len < vnet_hdr_len) |
bfd5f4a3 SS |
1660 | goto out_free; |
1661 | ||
1f18b717 MK |
1662 | len -= vnet_hdr_len; |
1663 | ||
bfd5f4a3 SS |
1664 | if (skb_is_gso(skb)) { |
1665 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1666 | ||
1667 | /* This is a hint as to how much should be linear. */ | |
1668 | vnet_hdr.hdr_len = skb_headlen(skb); | |
1669 | vnet_hdr.gso_size = sinfo->gso_size; | |
1670 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1671 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1672 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1673 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
1674 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
1675 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
1676 | else if (sinfo->gso_type & SKB_GSO_FCOE) | |
1677 | goto out_free; | |
1678 | else | |
1679 | BUG(); | |
1680 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
1681 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1682 | } else | |
1683 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1684 | ||
1685 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1686 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 1687 | vnet_hdr.csum_start = skb_checksum_start_offset(skb); |
bfd5f4a3 | 1688 | vnet_hdr.csum_offset = skb->csum_offset; |
10a8d94a JW |
1689 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1690 | vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
bfd5f4a3 SS |
1691 | } /* else everything is zero */ |
1692 | ||
1693 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, | |
1694 | vnet_hdr_len); | |
1695 | if (err < 0) | |
1696 | goto out_free; | |
1697 | } | |
1698 | ||
0fb375fb EB |
1699 | /* |
1700 | * If the address length field is there to be filled in, we fill | |
1701 | * it in now. | |
1702 | */ | |
1703 | ||
ffbc6111 | 1704 | sll = &PACKET_SKB_CB(skb)->sa.ll; |
0fb375fb EB |
1705 | if (sock->type == SOCK_PACKET) |
1706 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
1707 | else | |
1708 | msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); | |
1709 | ||
1da177e4 LT |
1710 | /* |
1711 | * You lose any data beyond the buffer you gave. If it worries a | |
1712 | * user program they can ask the device for its MTU anyway. | |
1713 | */ | |
1714 | ||
1715 | copied = skb->len; | |
40d4e3df ED |
1716 | if (copied > len) { |
1717 | copied = len; | |
1718 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
1719 | } |
1720 | ||
1721 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1722 | if (err) | |
1723 | goto out_free; | |
1724 | ||
3b885787 | 1725 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
1726 | |
1727 | if (msg->msg_name) | |
ffbc6111 HX |
1728 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
1729 | msg->msg_namelen); | |
1da177e4 | 1730 | |
8dc41944 | 1731 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
1732 | struct tpacket_auxdata aux; |
1733 | ||
1734 | aux.tp_status = TP_STATUS_USER; | |
1735 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
1736 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
1737 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
1738 | aux.tp_snaplen = skb->len; | |
1739 | aux.tp_mac = 0; | |
bbe735e4 | 1740 | aux.tp_net = skb_network_offset(skb); |
a3bcc23e BG |
1741 | if (vlan_tx_tag_present(skb)) { |
1742 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); | |
1743 | aux.tp_status |= TP_STATUS_VLAN_VALID; | |
1744 | } else { | |
1745 | aux.tp_vlan_tci = 0; | |
1746 | } | |
13fcb7bd | 1747 | aux.tp_padding = 0; |
ffbc6111 | 1748 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
8dc41944 HX |
1749 | } |
1750 | ||
1da177e4 LT |
1751 | /* |
1752 | * Free or return the buffer as appropriate. Again this | |
1753 | * hides all the races and re-entrancy issues from us. | |
1754 | */ | |
bfd5f4a3 | 1755 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
1756 | |
1757 | out_free: | |
1758 | skb_free_datagram(sk, skb); | |
1759 | out: | |
1760 | return err; | |
1761 | } | |
1762 | ||
1da177e4 LT |
1763 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
1764 | int *uaddr_len, int peer) | |
1765 | { | |
1766 | struct net_device *dev; | |
1767 | struct sock *sk = sock->sk; | |
1768 | ||
1769 | if (peer) | |
1770 | return -EOPNOTSUPP; | |
1771 | ||
1772 | uaddr->sa_family = AF_PACKET; | |
654d1f8a ED |
1773 | rcu_read_lock(); |
1774 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
1775 | if (dev) | |
67286640 | 1776 | strncpy(uaddr->sa_data, dev->name, 14); |
654d1f8a | 1777 | else |
1da177e4 | 1778 | memset(uaddr->sa_data, 0, 14); |
654d1f8a | 1779 | rcu_read_unlock(); |
1da177e4 LT |
1780 | *uaddr_len = sizeof(*uaddr); |
1781 | ||
1782 | return 0; | |
1783 | } | |
1da177e4 LT |
1784 | |
1785 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
1786 | int *uaddr_len, int peer) | |
1787 | { | |
1788 | struct net_device *dev; | |
1789 | struct sock *sk = sock->sk; | |
1790 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 1791 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
1792 | |
1793 | if (peer) | |
1794 | return -EOPNOTSUPP; | |
1795 | ||
1796 | sll->sll_family = AF_PACKET; | |
1797 | sll->sll_ifindex = po->ifindex; | |
1798 | sll->sll_protocol = po->num; | |
67286640 | 1799 | sll->sll_pkttype = 0; |
654d1f8a ED |
1800 | rcu_read_lock(); |
1801 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
1802 | if (dev) { |
1803 | sll->sll_hatype = dev->type; | |
1804 | sll->sll_halen = dev->addr_len; | |
1805 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
1806 | } else { |
1807 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1808 | sll->sll_halen = 0; | |
1809 | } | |
654d1f8a | 1810 | rcu_read_unlock(); |
0fb375fb | 1811 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
1812 | |
1813 | return 0; | |
1814 | } | |
1815 | ||
2aeb0b88 WC |
1816 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
1817 | int what) | |
1da177e4 LT |
1818 | { |
1819 | switch (i->type) { | |
1820 | case PACKET_MR_MULTICAST: | |
1162563f JP |
1821 | if (i->alen != dev->addr_len) |
1822 | return -EINVAL; | |
1da177e4 | 1823 | if (what > 0) |
22bedad3 | 1824 | return dev_mc_add(dev, i->addr); |
1da177e4 | 1825 | else |
22bedad3 | 1826 | return dev_mc_del(dev, i->addr); |
1da177e4 LT |
1827 | break; |
1828 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 1829 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
1830 | break; |
1831 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 1832 | return dev_set_allmulti(dev, what); |
1da177e4 | 1833 | break; |
d95ed927 | 1834 | case PACKET_MR_UNICAST: |
1162563f JP |
1835 | if (i->alen != dev->addr_len) |
1836 | return -EINVAL; | |
d95ed927 | 1837 | if (what > 0) |
a748ee24 | 1838 | return dev_uc_add(dev, i->addr); |
d95ed927 | 1839 | else |
a748ee24 | 1840 | return dev_uc_del(dev, i->addr); |
d95ed927 | 1841 | break; |
40d4e3df ED |
1842 | default: |
1843 | break; | |
1da177e4 | 1844 | } |
2aeb0b88 | 1845 | return 0; |
1da177e4 LT |
1846 | } |
1847 | ||
1848 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
1849 | { | |
40d4e3df | 1850 | for ( ; i; i = i->next) { |
1da177e4 LT |
1851 | if (i->ifindex == dev->ifindex) |
1852 | packet_dev_mc(dev, i, what); | |
1853 | } | |
1854 | } | |
1855 | ||
0fb375fb | 1856 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1857 | { |
1858 | struct packet_sock *po = pkt_sk(sk); | |
1859 | struct packet_mclist *ml, *i; | |
1860 | struct net_device *dev; | |
1861 | int err; | |
1862 | ||
1863 | rtnl_lock(); | |
1864 | ||
1865 | err = -ENODEV; | |
3b1e0a65 | 1866 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
1867 | if (!dev) |
1868 | goto done; | |
1869 | ||
1870 | err = -EINVAL; | |
1162563f | 1871 | if (mreq->mr_alen > dev->addr_len) |
1da177e4 LT |
1872 | goto done; |
1873 | ||
1874 | err = -ENOBUFS; | |
8b3a7005 | 1875 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
1876 | if (i == NULL) |
1877 | goto done; | |
1878 | ||
1879 | err = 0; | |
1880 | for (ml = po->mclist; ml; ml = ml->next) { | |
1881 | if (ml->ifindex == mreq->mr_ifindex && | |
1882 | ml->type == mreq->mr_type && | |
1883 | ml->alen == mreq->mr_alen && | |
1884 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1885 | ml->count++; | |
1886 | /* Free the new element ... */ | |
1887 | kfree(i); | |
1888 | goto done; | |
1889 | } | |
1890 | } | |
1891 | ||
1892 | i->type = mreq->mr_type; | |
1893 | i->ifindex = mreq->mr_ifindex; | |
1894 | i->alen = mreq->mr_alen; | |
1895 | memcpy(i->addr, mreq->mr_address, i->alen); | |
1896 | i->count = 1; | |
1897 | i->next = po->mclist; | |
1898 | po->mclist = i; | |
2aeb0b88 WC |
1899 | err = packet_dev_mc(dev, i, 1); |
1900 | if (err) { | |
1901 | po->mclist = i->next; | |
1902 | kfree(i); | |
1903 | } | |
1da177e4 LT |
1904 | |
1905 | done: | |
1906 | rtnl_unlock(); | |
1907 | return err; | |
1908 | } | |
1909 | ||
0fb375fb | 1910 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
1911 | { |
1912 | struct packet_mclist *ml, **mlp; | |
1913 | ||
1914 | rtnl_lock(); | |
1915 | ||
1916 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
1917 | if (ml->ifindex == mreq->mr_ifindex && | |
1918 | ml->type == mreq->mr_type && | |
1919 | ml->alen == mreq->mr_alen && | |
1920 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
1921 | if (--ml->count == 0) { | |
1922 | struct net_device *dev; | |
1923 | *mlp = ml->next; | |
ad959e76 ED |
1924 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1925 | if (dev) | |
1da177e4 | 1926 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1927 | kfree(ml); |
1928 | } | |
1929 | rtnl_unlock(); | |
1930 | return 0; | |
1931 | } | |
1932 | } | |
1933 | rtnl_unlock(); | |
1934 | return -EADDRNOTAVAIL; | |
1935 | } | |
1936 | ||
1937 | static void packet_flush_mclist(struct sock *sk) | |
1938 | { | |
1939 | struct packet_sock *po = pkt_sk(sk); | |
1940 | struct packet_mclist *ml; | |
1941 | ||
1942 | if (!po->mclist) | |
1943 | return; | |
1944 | ||
1945 | rtnl_lock(); | |
1946 | while ((ml = po->mclist) != NULL) { | |
1947 | struct net_device *dev; | |
1948 | ||
1949 | po->mclist = ml->next; | |
ad959e76 ED |
1950 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
1951 | if (dev != NULL) | |
1da177e4 | 1952 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
1953 | kfree(ml); |
1954 | } | |
1955 | rtnl_unlock(); | |
1956 | } | |
1da177e4 LT |
1957 | |
1958 | static int | |
b7058842 | 1959 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1960 | { |
1961 | struct sock *sk = sock->sk; | |
8dc41944 | 1962 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
1963 | int ret; |
1964 | ||
1965 | if (level != SOL_PACKET) | |
1966 | return -ENOPROTOOPT; | |
1967 | ||
69e3c75f | 1968 | switch (optname) { |
1ce4f28b | 1969 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
1970 | case PACKET_DROP_MEMBERSHIP: |
1971 | { | |
0fb375fb EB |
1972 | struct packet_mreq_max mreq; |
1973 | int len = optlen; | |
1974 | memset(&mreq, 0, sizeof(mreq)); | |
1975 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 1976 | return -EINVAL; |
0fb375fb EB |
1977 | if (len > sizeof(mreq)) |
1978 | len = sizeof(mreq); | |
40d4e3df | 1979 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 1980 | return -EFAULT; |
0fb375fb EB |
1981 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
1982 | return -EINVAL; | |
1da177e4 LT |
1983 | if (optname == PACKET_ADD_MEMBERSHIP) |
1984 | ret = packet_mc_add(sk, &mreq); | |
1985 | else | |
1986 | ret = packet_mc_drop(sk, &mreq); | |
1987 | return ret; | |
1988 | } | |
a2efcfa0 | 1989 | |
1da177e4 | 1990 | case PACKET_RX_RING: |
69e3c75f | 1991 | case PACKET_TX_RING: |
1da177e4 LT |
1992 | { |
1993 | struct tpacket_req req; | |
1994 | ||
40d4e3df | 1995 | if (optlen < sizeof(req)) |
1da177e4 | 1996 | return -EINVAL; |
bfd5f4a3 SS |
1997 | if (pkt_sk(sk)->has_vnet_hdr) |
1998 | return -EINVAL; | |
40d4e3df | 1999 | if (copy_from_user(&req, optval, sizeof(req))) |
1da177e4 | 2000 | return -EFAULT; |
69e3c75f | 2001 | return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
1da177e4 LT |
2002 | } |
2003 | case PACKET_COPY_THRESH: | |
2004 | { | |
2005 | int val; | |
2006 | ||
40d4e3df | 2007 | if (optlen != sizeof(val)) |
1da177e4 | 2008 | return -EINVAL; |
40d4e3df | 2009 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
2010 | return -EFAULT; |
2011 | ||
2012 | pkt_sk(sk)->copy_thresh = val; | |
2013 | return 0; | |
2014 | } | |
bbd6ef87 PM |
2015 | case PACKET_VERSION: |
2016 | { | |
2017 | int val; | |
2018 | ||
2019 | if (optlen != sizeof(val)) | |
2020 | return -EINVAL; | |
69e3c75f | 2021 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
2022 | return -EBUSY; |
2023 | if (copy_from_user(&val, optval, sizeof(val))) | |
2024 | return -EFAULT; | |
2025 | switch (val) { | |
2026 | case TPACKET_V1: | |
2027 | case TPACKET_V2: | |
2028 | po->tp_version = val; | |
2029 | return 0; | |
2030 | default: | |
2031 | return -EINVAL; | |
2032 | } | |
2033 | } | |
8913336a PM |
2034 | case PACKET_RESERVE: |
2035 | { | |
2036 | unsigned int val; | |
2037 | ||
2038 | if (optlen != sizeof(val)) | |
2039 | return -EINVAL; | |
69e3c75f | 2040 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
2041 | return -EBUSY; |
2042 | if (copy_from_user(&val, optval, sizeof(val))) | |
2043 | return -EFAULT; | |
2044 | po->tp_reserve = val; | |
2045 | return 0; | |
2046 | } | |
69e3c75f JB |
2047 | case PACKET_LOSS: |
2048 | { | |
2049 | unsigned int val; | |
2050 | ||
2051 | if (optlen != sizeof(val)) | |
2052 | return -EINVAL; | |
2053 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2054 | return -EBUSY; | |
2055 | if (copy_from_user(&val, optval, sizeof(val))) | |
2056 | return -EFAULT; | |
2057 | po->tp_loss = !!val; | |
2058 | return 0; | |
2059 | } | |
8dc41944 HX |
2060 | case PACKET_AUXDATA: |
2061 | { | |
2062 | int val; | |
2063 | ||
2064 | if (optlen < sizeof(val)) | |
2065 | return -EINVAL; | |
2066 | if (copy_from_user(&val, optval, sizeof(val))) | |
2067 | return -EFAULT; | |
2068 | ||
2069 | po->auxdata = !!val; | |
2070 | return 0; | |
2071 | } | |
80feaacb PWJ |
2072 | case PACKET_ORIGDEV: |
2073 | { | |
2074 | int val; | |
2075 | ||
2076 | if (optlen < sizeof(val)) | |
2077 | return -EINVAL; | |
2078 | if (copy_from_user(&val, optval, sizeof(val))) | |
2079 | return -EFAULT; | |
2080 | ||
2081 | po->origdev = !!val; | |
2082 | return 0; | |
2083 | } | |
bfd5f4a3 SS |
2084 | case PACKET_VNET_HDR: |
2085 | { | |
2086 | int val; | |
2087 | ||
2088 | if (sock->type != SOCK_RAW) | |
2089 | return -EINVAL; | |
2090 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
2091 | return -EBUSY; | |
2092 | if (optlen < sizeof(val)) | |
2093 | return -EINVAL; | |
2094 | if (copy_from_user(&val, optval, sizeof(val))) | |
2095 | return -EFAULT; | |
2096 | ||
2097 | po->has_vnet_hdr = !!val; | |
2098 | return 0; | |
2099 | } | |
614f60fa SM |
2100 | case PACKET_TIMESTAMP: |
2101 | { | |
2102 | int val; | |
2103 | ||
2104 | if (optlen != sizeof(val)) | |
2105 | return -EINVAL; | |
2106 | if (copy_from_user(&val, optval, sizeof(val))) | |
2107 | return -EFAULT; | |
2108 | ||
2109 | po->tp_tstamp = val; | |
2110 | return 0; | |
2111 | } | |
1da177e4 LT |
2112 | default: |
2113 | return -ENOPROTOOPT; | |
2114 | } | |
2115 | } | |
2116 | ||
2117 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
2118 | char __user *optval, int __user *optlen) | |
2119 | { | |
2120 | int len; | |
8dc41944 | 2121 | int val; |
1da177e4 LT |
2122 | struct sock *sk = sock->sk; |
2123 | struct packet_sock *po = pkt_sk(sk); | |
8dc41944 HX |
2124 | void *data; |
2125 | struct tpacket_stats st; | |
1da177e4 LT |
2126 | |
2127 | if (level != SOL_PACKET) | |
2128 | return -ENOPROTOOPT; | |
2129 | ||
8ae55f04 KK |
2130 | if (get_user(len, optlen)) |
2131 | return -EFAULT; | |
1da177e4 LT |
2132 | |
2133 | if (len < 0) | |
2134 | return -EINVAL; | |
1ce4f28b | 2135 | |
69e3c75f | 2136 | switch (optname) { |
1da177e4 | 2137 | case PACKET_STATISTICS: |
1da177e4 LT |
2138 | if (len > sizeof(struct tpacket_stats)) |
2139 | len = sizeof(struct tpacket_stats); | |
2140 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2141 | st = po->stats; | |
2142 | memset(&po->stats, 0, sizeof(st)); | |
2143 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2144 | st.tp_packets += st.tp_drops; | |
2145 | ||
8dc41944 HX |
2146 | data = &st; |
2147 | break; | |
2148 | case PACKET_AUXDATA: | |
2149 | if (len > sizeof(int)) | |
2150 | len = sizeof(int); | |
2151 | val = po->auxdata; | |
2152 | ||
80feaacb PWJ |
2153 | data = &val; |
2154 | break; | |
2155 | case PACKET_ORIGDEV: | |
2156 | if (len > sizeof(int)) | |
2157 | len = sizeof(int); | |
2158 | val = po->origdev; | |
2159 | ||
bfd5f4a3 SS |
2160 | data = &val; |
2161 | break; | |
2162 | case PACKET_VNET_HDR: | |
2163 | if (len > sizeof(int)) | |
2164 | len = sizeof(int); | |
2165 | val = po->has_vnet_hdr; | |
2166 | ||
8dc41944 | 2167 | data = &val; |
1da177e4 | 2168 | break; |
bbd6ef87 PM |
2169 | case PACKET_VERSION: |
2170 | if (len > sizeof(int)) | |
2171 | len = sizeof(int); | |
2172 | val = po->tp_version; | |
2173 | data = &val; | |
2174 | break; | |
2175 | case PACKET_HDRLEN: | |
2176 | if (len > sizeof(int)) | |
2177 | len = sizeof(int); | |
2178 | if (copy_from_user(&val, optval, len)) | |
2179 | return -EFAULT; | |
2180 | switch (val) { | |
2181 | case TPACKET_V1: | |
2182 | val = sizeof(struct tpacket_hdr); | |
2183 | break; | |
2184 | case TPACKET_V2: | |
2185 | val = sizeof(struct tpacket2_hdr); | |
2186 | break; | |
2187 | default: | |
2188 | return -EINVAL; | |
2189 | } | |
2190 | data = &val; | |
2191 | break; | |
8913336a PM |
2192 | case PACKET_RESERVE: |
2193 | if (len > sizeof(unsigned int)) | |
2194 | len = sizeof(unsigned int); | |
2195 | val = po->tp_reserve; | |
2196 | data = &val; | |
2197 | break; | |
69e3c75f JB |
2198 | case PACKET_LOSS: |
2199 | if (len > sizeof(unsigned int)) | |
2200 | len = sizeof(unsigned int); | |
2201 | val = po->tp_loss; | |
2202 | data = &val; | |
2203 | break; | |
614f60fa SM |
2204 | case PACKET_TIMESTAMP: |
2205 | if (len > sizeof(int)) | |
2206 | len = sizeof(int); | |
2207 | val = po->tp_tstamp; | |
2208 | data = &val; | |
2209 | break; | |
1da177e4 LT |
2210 | default: |
2211 | return -ENOPROTOOPT; | |
2212 | } | |
2213 | ||
8ae55f04 KK |
2214 | if (put_user(len, optlen)) |
2215 | return -EFAULT; | |
8dc41944 HX |
2216 | if (copy_to_user(optval, data, len)) |
2217 | return -EFAULT; | |
8ae55f04 | 2218 | return 0; |
1da177e4 LT |
2219 | } |
2220 | ||
2221 | ||
2222 | static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
2223 | { | |
2224 | struct sock *sk; | |
2225 | struct hlist_node *node; | |
ad930650 | 2226 | struct net_device *dev = data; |
c346dca1 | 2227 | struct net *net = dev_net(dev); |
1da177e4 | 2228 | |
808f5114 | 2229 | rcu_read_lock(); |
2230 | sk_for_each_rcu(sk, node, &net->packet.sklist) { | |
1da177e4 LT |
2231 | struct packet_sock *po = pkt_sk(sk); |
2232 | ||
2233 | switch (msg) { | |
2234 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
2235 | if (po->mclist) |
2236 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
2237 | /* fallthrough */ |
2238 | ||
1da177e4 LT |
2239 | case NETDEV_DOWN: |
2240 | if (dev->ifindex == po->ifindex) { | |
2241 | spin_lock(&po->bind_lock); | |
2242 | if (po->running) { | |
2243 | __dev_remove_pack(&po->prot_hook); | |
2244 | __sock_put(sk); | |
2245 | po->running = 0; | |
2246 | sk->sk_err = ENETDOWN; | |
2247 | if (!sock_flag(sk, SOCK_DEAD)) | |
2248 | sk->sk_error_report(sk); | |
2249 | } | |
2250 | if (msg == NETDEV_UNREGISTER) { | |
2251 | po->ifindex = -1; | |
160ff18a BG |
2252 | if (po->prot_hook.dev) |
2253 | dev_put(po->prot_hook.dev); | |
1da177e4 LT |
2254 | po->prot_hook.dev = NULL; |
2255 | } | |
2256 | spin_unlock(&po->bind_lock); | |
2257 | } | |
2258 | break; | |
2259 | case NETDEV_UP: | |
808f5114 | 2260 | if (dev->ifindex == po->ifindex) { |
2261 | spin_lock(&po->bind_lock); | |
2262 | if (po->num && !po->running) { | |
2263 | dev_add_pack(&po->prot_hook); | |
2264 | sock_hold(sk); | |
2265 | po->running = 1; | |
2266 | } | |
2267 | spin_unlock(&po->bind_lock); | |
1da177e4 | 2268 | } |
1da177e4 LT |
2269 | break; |
2270 | } | |
2271 | } | |
808f5114 | 2272 | rcu_read_unlock(); |
1da177e4 LT |
2273 | return NOTIFY_DONE; |
2274 | } | |
2275 | ||
2276 | ||
2277 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
2278 | unsigned long arg) | |
2279 | { | |
2280 | struct sock *sk = sock->sk; | |
2281 | ||
69e3c75f | 2282 | switch (cmd) { |
40d4e3df ED |
2283 | case SIOCOUTQ: |
2284 | { | |
2285 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 2286 | |
40d4e3df ED |
2287 | return put_user(amount, (int __user *)arg); |
2288 | } | |
2289 | case SIOCINQ: | |
2290 | { | |
2291 | struct sk_buff *skb; | |
2292 | int amount = 0; | |
2293 | ||
2294 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
2295 | skb = skb_peek(&sk->sk_receive_queue); | |
2296 | if (skb) | |
2297 | amount = skb->len; | |
2298 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
2299 | return put_user(amount, (int __user *)arg); | |
2300 | } | |
2301 | case SIOCGSTAMP: | |
2302 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
2303 | case SIOCGSTAMPNS: | |
2304 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 2305 | |
1da177e4 | 2306 | #ifdef CONFIG_INET |
40d4e3df ED |
2307 | case SIOCADDRT: |
2308 | case SIOCDELRT: | |
2309 | case SIOCDARP: | |
2310 | case SIOCGARP: | |
2311 | case SIOCSARP: | |
2312 | case SIOCGIFADDR: | |
2313 | case SIOCSIFADDR: | |
2314 | case SIOCGIFBRDADDR: | |
2315 | case SIOCSIFBRDADDR: | |
2316 | case SIOCGIFNETMASK: | |
2317 | case SIOCSIFNETMASK: | |
2318 | case SIOCGIFDSTADDR: | |
2319 | case SIOCSIFDSTADDR: | |
2320 | case SIOCSIFFLAGS: | |
40d4e3df | 2321 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
1da177e4 LT |
2322 | #endif |
2323 | ||
40d4e3df ED |
2324 | default: |
2325 | return -ENOIOCTLCMD; | |
1da177e4 LT |
2326 | } |
2327 | return 0; | |
2328 | } | |
2329 | ||
40d4e3df | 2330 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
2331 | poll_table *wait) |
2332 | { | |
2333 | struct sock *sk = sock->sk; | |
2334 | struct packet_sock *po = pkt_sk(sk); | |
2335 | unsigned int mask = datagram_poll(file, sock, wait); | |
2336 | ||
2337 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2338 | if (po->rx_ring.pg_vec) { |
2339 | if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) | |
1da177e4 LT |
2340 | mask |= POLLIN | POLLRDNORM; |
2341 | } | |
2342 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
2343 | spin_lock_bh(&sk->sk_write_queue.lock); |
2344 | if (po->tx_ring.pg_vec) { | |
2345 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
2346 | mask |= POLLOUT | POLLWRNORM; | |
2347 | } | |
2348 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
2349 | return mask; |
2350 | } | |
2351 | ||
2352 | ||
2353 | /* Dirty? Well, I still did not learn better way to account | |
2354 | * for user mmaps. | |
2355 | */ | |
2356 | ||
2357 | static void packet_mm_open(struct vm_area_struct *vma) | |
2358 | { | |
2359 | struct file *file = vma->vm_file; | |
40d4e3df | 2360 | struct socket *sock = file->private_data; |
1da177e4 | 2361 | struct sock *sk = sock->sk; |
1ce4f28b | 2362 | |
1da177e4 LT |
2363 | if (sk) |
2364 | atomic_inc(&pkt_sk(sk)->mapped); | |
2365 | } | |
2366 | ||
2367 | static void packet_mm_close(struct vm_area_struct *vma) | |
2368 | { | |
2369 | struct file *file = vma->vm_file; | |
40d4e3df | 2370 | struct socket *sock = file->private_data; |
1da177e4 | 2371 | struct sock *sk = sock->sk; |
1ce4f28b | 2372 | |
1da177e4 LT |
2373 | if (sk) |
2374 | atomic_dec(&pkt_sk(sk)->mapped); | |
2375 | } | |
2376 | ||
f0f37e2f | 2377 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
2378 | .open = packet_mm_open, |
2379 | .close = packet_mm_close, | |
1da177e4 LT |
2380 | }; |
2381 | ||
0e3125c7 NH |
2382 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
2383 | unsigned int len) | |
1da177e4 LT |
2384 | { |
2385 | int i; | |
2386 | ||
4ebf0ae2 | 2387 | for (i = 0; i < len; i++) { |
0e3125c7 | 2388 | if (likely(pg_vec[i].buffer)) { |
c56b4d90 | 2389 | if (is_vmalloc_addr(pg_vec[i].buffer)) |
0e3125c7 NH |
2390 | vfree(pg_vec[i].buffer); |
2391 | else | |
2392 | free_pages((unsigned long)pg_vec[i].buffer, | |
2393 | order); | |
2394 | pg_vec[i].buffer = NULL; | |
2395 | } | |
1da177e4 LT |
2396 | } |
2397 | kfree(pg_vec); | |
2398 | } | |
2399 | ||
c56b4d90 | 2400 | static inline char *alloc_one_pg_vec_page(unsigned long order) |
4ebf0ae2 | 2401 | { |
0e3125c7 NH |
2402 | char *buffer = NULL; |
2403 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | | |
2404 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; | |
2405 | ||
2406 | buffer = (char *) __get_free_pages(gfp_flags, order); | |
2407 | ||
2408 | if (buffer) | |
2409 | return buffer; | |
2410 | ||
2411 | /* | |
2412 | * __get_free_pages failed, fall back to vmalloc | |
2413 | */ | |
bbce5a59 | 2414 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
719bfeaa | 2415 | |
0e3125c7 NH |
2416 | if (buffer) |
2417 | return buffer; | |
2418 | ||
2419 | /* | |
2420 | * vmalloc failed, lets dig into swap here | |
2421 | */ | |
0e3125c7 NH |
2422 | gfp_flags &= ~__GFP_NORETRY; |
2423 | buffer = (char *)__get_free_pages(gfp_flags, order); | |
2424 | if (buffer) | |
2425 | return buffer; | |
2426 | ||
2427 | /* | |
2428 | * complete and utter failure | |
2429 | */ | |
2430 | return NULL; | |
4ebf0ae2 DM |
2431 | } |
2432 | ||
0e3125c7 | 2433 | static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
4ebf0ae2 DM |
2434 | { |
2435 | unsigned int block_nr = req->tp_block_nr; | |
0e3125c7 | 2436 | struct pgv *pg_vec; |
4ebf0ae2 DM |
2437 | int i; |
2438 | ||
0e3125c7 | 2439 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
4ebf0ae2 DM |
2440 | if (unlikely(!pg_vec)) |
2441 | goto out; | |
2442 | ||
2443 | for (i = 0; i < block_nr; i++) { | |
c56b4d90 | 2444 | pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
0e3125c7 | 2445 | if (unlikely(!pg_vec[i].buffer)) |
4ebf0ae2 DM |
2446 | goto out_free_pgvec; |
2447 | } | |
2448 | ||
2449 | out: | |
2450 | return pg_vec; | |
2451 | ||
2452 | out_free_pgvec: | |
2453 | free_pg_vec(pg_vec, order, block_nr); | |
2454 | pg_vec = NULL; | |
2455 | goto out; | |
2456 | } | |
1da177e4 | 2457 | |
69e3c75f JB |
2458 | static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
2459 | int closing, int tx_ring) | |
1da177e4 | 2460 | { |
0e3125c7 | 2461 | struct pgv *pg_vec = NULL; |
1da177e4 | 2462 | struct packet_sock *po = pkt_sk(sk); |
0e11c91e | 2463 | int was_running, order = 0; |
69e3c75f JB |
2464 | struct packet_ring_buffer *rb; |
2465 | struct sk_buff_head *rb_queue; | |
0e11c91e | 2466 | __be16 num; |
69e3c75f | 2467 | int err; |
1ce4f28b | 2468 | |
69e3c75f JB |
2469 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
2470 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 2471 | |
69e3c75f JB |
2472 | err = -EBUSY; |
2473 | if (!closing) { | |
2474 | if (atomic_read(&po->mapped)) | |
2475 | goto out; | |
2476 | if (atomic_read(&rb->pending)) | |
2477 | goto out; | |
2478 | } | |
1da177e4 | 2479 | |
69e3c75f JB |
2480 | if (req->tp_block_nr) { |
2481 | /* Sanity tests and some calculations */ | |
2482 | err = -EBUSY; | |
2483 | if (unlikely(rb->pg_vec)) | |
2484 | goto out; | |
1da177e4 | 2485 | |
bbd6ef87 PM |
2486 | switch (po->tp_version) { |
2487 | case TPACKET_V1: | |
2488 | po->tp_hdrlen = TPACKET_HDRLEN; | |
2489 | break; | |
2490 | case TPACKET_V2: | |
2491 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
2492 | break; | |
2493 | } | |
2494 | ||
69e3c75f | 2495 | err = -EINVAL; |
4ebf0ae2 | 2496 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 2497 | goto out; |
4ebf0ae2 | 2498 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 2499 | goto out; |
8913336a | 2500 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
2501 | po->tp_reserve)) |
2502 | goto out; | |
4ebf0ae2 | 2503 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 2504 | goto out; |
1da177e4 | 2505 | |
69e3c75f JB |
2506 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
2507 | if (unlikely(rb->frames_per_block <= 0)) | |
2508 | goto out; | |
2509 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
2510 | req->tp_frame_nr)) | |
2511 | goto out; | |
1da177e4 LT |
2512 | |
2513 | err = -ENOMEM; | |
4ebf0ae2 DM |
2514 | order = get_order(req->tp_block_size); |
2515 | pg_vec = alloc_pg_vec(req, order); | |
2516 | if (unlikely(!pg_vec)) | |
1da177e4 | 2517 | goto out; |
69e3c75f JB |
2518 | } |
2519 | /* Done */ | |
2520 | else { | |
2521 | err = -EINVAL; | |
4ebf0ae2 | 2522 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 2523 | goto out; |
1da177e4 LT |
2524 | } |
2525 | ||
2526 | lock_sock(sk); | |
2527 | ||
2528 | /* Detach socket from network */ | |
2529 | spin_lock(&po->bind_lock); | |
2530 | was_running = po->running; | |
2531 | num = po->num; | |
2532 | if (was_running) { | |
2533 | __dev_remove_pack(&po->prot_hook); | |
2534 | po->num = 0; | |
2535 | po->running = 0; | |
2536 | __sock_put(sk); | |
2537 | } | |
2538 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 2539 | |
1da177e4 LT |
2540 | synchronize_net(); |
2541 | ||
2542 | err = -EBUSY; | |
905db440 | 2543 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
2544 | if (closing || atomic_read(&po->mapped) == 0) { |
2545 | err = 0; | |
69e3c75f | 2546 | spin_lock_bh(&rb_queue->lock); |
c053fd96 | 2547 | swap(rb->pg_vec, pg_vec); |
69e3c75f JB |
2548 | rb->frame_max = (req->tp_frame_nr - 1); |
2549 | rb->head = 0; | |
2550 | rb->frame_size = req->tp_frame_size; | |
2551 | spin_unlock_bh(&rb_queue->lock); | |
2552 | ||
c053fd96 CG |
2553 | swap(rb->pg_vec_order, order); |
2554 | swap(rb->pg_vec_len, req->tp_block_nr); | |
69e3c75f JB |
2555 | |
2556 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
2557 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
2558 | tpacket_rcv : packet_rcv; | |
2559 | skb_queue_purge(rb_queue); | |
1da177e4 | 2560 | if (atomic_read(&po->mapped)) |
40d4e3df ED |
2561 | pr_err("packet_mmap: vma is busy: %d\n", |
2562 | atomic_read(&po->mapped)); | |
1da177e4 | 2563 | } |
905db440 | 2564 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2565 | |
2566 | spin_lock(&po->bind_lock); | |
2567 | if (was_running && !po->running) { | |
2568 | sock_hold(sk); | |
2569 | po->running = 1; | |
2570 | po->num = num; | |
2571 | dev_add_pack(&po->prot_hook); | |
2572 | } | |
2573 | spin_unlock(&po->bind_lock); | |
2574 | ||
2575 | release_sock(sk); | |
2576 | ||
1da177e4 LT |
2577 | if (pg_vec) |
2578 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
2579 | out: | |
2580 | return err; | |
2581 | } | |
2582 | ||
69e3c75f JB |
2583 | static int packet_mmap(struct file *file, struct socket *sock, |
2584 | struct vm_area_struct *vma) | |
1da177e4 LT |
2585 | { |
2586 | struct sock *sk = sock->sk; | |
2587 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
2588 | unsigned long size, expected_size; |
2589 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
2590 | unsigned long start; |
2591 | int err = -EINVAL; | |
2592 | int i; | |
2593 | ||
2594 | if (vma->vm_pgoff) | |
2595 | return -EINVAL; | |
2596 | ||
905db440 | 2597 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
2598 | |
2599 | expected_size = 0; | |
2600 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
2601 | if (rb->pg_vec) { | |
2602 | expected_size += rb->pg_vec_len | |
2603 | * rb->pg_vec_pages | |
2604 | * PAGE_SIZE; | |
2605 | } | |
2606 | } | |
2607 | ||
2608 | if (expected_size == 0) | |
1da177e4 | 2609 | goto out; |
69e3c75f JB |
2610 | |
2611 | size = vma->vm_end - vma->vm_start; | |
2612 | if (size != expected_size) | |
1da177e4 LT |
2613 | goto out; |
2614 | ||
1da177e4 | 2615 | start = vma->vm_start; |
69e3c75f JB |
2616 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
2617 | if (rb->pg_vec == NULL) | |
2618 | continue; | |
2619 | ||
2620 | for (i = 0; i < rb->pg_vec_len; i++) { | |
0e3125c7 NH |
2621 | struct page *page; |
2622 | void *kaddr = rb->pg_vec[i].buffer; | |
69e3c75f JB |
2623 | int pg_num; |
2624 | ||
c56b4d90 CG |
2625 | for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
2626 | page = pgv_to_page(kaddr); | |
69e3c75f JB |
2627 | err = vm_insert_page(vma, start, page); |
2628 | if (unlikely(err)) | |
2629 | goto out; | |
2630 | start += PAGE_SIZE; | |
0e3125c7 | 2631 | kaddr += PAGE_SIZE; |
69e3c75f | 2632 | } |
4ebf0ae2 | 2633 | } |
1da177e4 | 2634 | } |
69e3c75f | 2635 | |
4ebf0ae2 | 2636 | atomic_inc(&po->mapped); |
1da177e4 LT |
2637 | vma->vm_ops = &packet_mmap_ops; |
2638 | err = 0; | |
2639 | ||
2640 | out: | |
905db440 | 2641 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
2642 | return err; |
2643 | } | |
1da177e4 | 2644 | |
90ddc4f0 | 2645 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
2646 | .family = PF_PACKET, |
2647 | .owner = THIS_MODULE, | |
2648 | .release = packet_release, | |
2649 | .bind = packet_bind_spkt, | |
2650 | .connect = sock_no_connect, | |
2651 | .socketpair = sock_no_socketpair, | |
2652 | .accept = sock_no_accept, | |
2653 | .getname = packet_getname_spkt, | |
2654 | .poll = datagram_poll, | |
2655 | .ioctl = packet_ioctl, | |
2656 | .listen = sock_no_listen, | |
2657 | .shutdown = sock_no_shutdown, | |
2658 | .setsockopt = sock_no_setsockopt, | |
2659 | .getsockopt = sock_no_getsockopt, | |
2660 | .sendmsg = packet_sendmsg_spkt, | |
2661 | .recvmsg = packet_recvmsg, | |
2662 | .mmap = sock_no_mmap, | |
2663 | .sendpage = sock_no_sendpage, | |
2664 | }; | |
1da177e4 | 2665 | |
90ddc4f0 | 2666 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
2667 | .family = PF_PACKET, |
2668 | .owner = THIS_MODULE, | |
2669 | .release = packet_release, | |
2670 | .bind = packet_bind, | |
2671 | .connect = sock_no_connect, | |
2672 | .socketpair = sock_no_socketpair, | |
2673 | .accept = sock_no_accept, | |
1ce4f28b | 2674 | .getname = packet_getname, |
1da177e4 LT |
2675 | .poll = packet_poll, |
2676 | .ioctl = packet_ioctl, | |
2677 | .listen = sock_no_listen, | |
2678 | .shutdown = sock_no_shutdown, | |
2679 | .setsockopt = packet_setsockopt, | |
2680 | .getsockopt = packet_getsockopt, | |
2681 | .sendmsg = packet_sendmsg, | |
2682 | .recvmsg = packet_recvmsg, | |
2683 | .mmap = packet_mmap, | |
2684 | .sendpage = sock_no_sendpage, | |
2685 | }; | |
2686 | ||
ec1b4cf7 | 2687 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
2688 | .family = PF_PACKET, |
2689 | .create = packet_create, | |
2690 | .owner = THIS_MODULE, | |
2691 | }; | |
2692 | ||
2693 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 2694 | .notifier_call = packet_notifier, |
1da177e4 LT |
2695 | }; |
2696 | ||
2697 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
2698 | |
2699 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
808f5114 | 2700 | __acquires(RCU) |
1da177e4 | 2701 | { |
e372c414 | 2702 | struct net *net = seq_file_net(seq); |
808f5114 | 2703 | |
2704 | rcu_read_lock(); | |
2705 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); | |
1da177e4 LT |
2706 | } |
2707 | ||
2708 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2709 | { | |
1bf40954 | 2710 | struct net *net = seq_file_net(seq); |
808f5114 | 2711 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
1da177e4 LT |
2712 | } |
2713 | ||
2714 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
808f5114 | 2715 | __releases(RCU) |
1da177e4 | 2716 | { |
808f5114 | 2717 | rcu_read_unlock(); |
1da177e4 LT |
2718 | } |
2719 | ||
1ce4f28b | 2720 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
2721 | { |
2722 | if (v == SEQ_START_TOKEN) | |
2723 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
2724 | else { | |
b7ceabd9 | 2725 | struct sock *s = sk_entry(v); |
1da177e4 LT |
2726 | const struct packet_sock *po = pkt_sk(s); |
2727 | ||
2728 | seq_printf(seq, | |
71338aa7 | 2729 | "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
1da177e4 LT |
2730 | s, |
2731 | atomic_read(&s->sk_refcnt), | |
2732 | s->sk_type, | |
2733 | ntohs(po->num), | |
2734 | po->ifindex, | |
2735 | po->running, | |
2736 | atomic_read(&s->sk_rmem_alloc), | |
2737 | sock_i_uid(s), | |
40d4e3df | 2738 | sock_i_ino(s)); |
1da177e4 LT |
2739 | } |
2740 | ||
2741 | return 0; | |
2742 | } | |
2743 | ||
56b3d975 | 2744 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
2745 | .start = packet_seq_start, |
2746 | .next = packet_seq_next, | |
2747 | .stop = packet_seq_stop, | |
2748 | .show = packet_seq_show, | |
2749 | }; | |
2750 | ||
2751 | static int packet_seq_open(struct inode *inode, struct file *file) | |
2752 | { | |
e372c414 DL |
2753 | return seq_open_net(inode, file, &packet_seq_ops, |
2754 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2755 | } |
2756 | ||
da7071d7 | 2757 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
2758 | .owner = THIS_MODULE, |
2759 | .open = packet_seq_open, | |
2760 | .read = seq_read, | |
2761 | .llseek = seq_lseek, | |
e372c414 | 2762 | .release = seq_release_net, |
1da177e4 LT |
2763 | }; |
2764 | ||
2765 | #endif | |
2766 | ||
2c8c1e72 | 2767 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 2768 | { |
808f5114 | 2769 | spin_lock_init(&net->packet.sklist_lock); |
2aaef4e4 | 2770 | INIT_HLIST_HEAD(&net->packet.sklist); |
d12d01d6 DL |
2771 | |
2772 | if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) | |
2773 | return -ENOMEM; | |
2774 | ||
2775 | return 0; | |
2776 | } | |
2777 | ||
2c8c1e72 | 2778 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 DL |
2779 | { |
2780 | proc_net_remove(net, "packet"); | |
2781 | } | |
2782 | ||
2783 | static struct pernet_operations packet_net_ops = { | |
2784 | .init = packet_net_init, | |
2785 | .exit = packet_net_exit, | |
2786 | }; | |
2787 | ||
2788 | ||
1da177e4 LT |
2789 | static void __exit packet_exit(void) |
2790 | { | |
1da177e4 | 2791 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 2792 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
2793 | sock_unregister(PF_PACKET); |
2794 | proto_unregister(&packet_proto); | |
2795 | } | |
2796 | ||
2797 | static int __init packet_init(void) | |
2798 | { | |
2799 | int rc = proto_register(&packet_proto, 0); | |
2800 | ||
2801 | if (rc != 0) | |
2802 | goto out; | |
2803 | ||
2804 | sock_register(&packet_family_ops); | |
d12d01d6 | 2805 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 2806 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
2807 | out: |
2808 | return rc; | |
2809 | } | |
2810 | ||
2811 | module_init(packet_init); | |
2812 | module_exit(packet_exit); | |
2813 | MODULE_LICENSE("GPL"); | |
2814 | MODULE_ALIAS_NETPROTO(PF_PACKET); |