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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. |
f6fb8f10 | 43 | * Chetan Loke : Implemented TPACKET_V3 block abstraction |
44 | * layer. | |
45 | * Copyright (C) 2011, <lokec@ccs.neu.edu> | |
46 | * | |
1da177e4 LT |
47 | * |
48 | * This program is free software; you can redistribute it and/or | |
49 | * modify it under the terms of the GNU General Public License | |
50 | * as published by the Free Software Foundation; either version | |
51 | * 2 of the License, or (at your option) any later version. | |
52 | * | |
53 | */ | |
1ce4f28b | 54 | |
1da177e4 | 55 | #include <linux/types.h> |
1da177e4 | 56 | #include <linux/mm.h> |
4fc268d2 | 57 | #include <linux/capability.h> |
1da177e4 LT |
58 | #include <linux/fcntl.h> |
59 | #include <linux/socket.h> | |
60 | #include <linux/in.h> | |
61 | #include <linux/inet.h> | |
62 | #include <linux/netdevice.h> | |
63 | #include <linux/if_packet.h> | |
64 | #include <linux/wireless.h> | |
ffbc6111 | 65 | #include <linux/kernel.h> |
1da177e4 | 66 | #include <linux/kmod.h> |
5a0e3ad6 | 67 | #include <linux/slab.h> |
0e3125c7 | 68 | #include <linux/vmalloc.h> |
457c4cbc | 69 | #include <net/net_namespace.h> |
1da177e4 LT |
70 | #include <net/ip.h> |
71 | #include <net/protocol.h> | |
72 | #include <linux/skbuff.h> | |
73 | #include <net/sock.h> | |
74 | #include <linux/errno.h> | |
75 | #include <linux/timer.h> | |
1da177e4 LT |
76 | #include <asm/uaccess.h> |
77 | #include <asm/ioctls.h> | |
78 | #include <asm/page.h> | |
a1f8e7f7 | 79 | #include <asm/cacheflush.h> |
1da177e4 LT |
80 | #include <asm/io.h> |
81 | #include <linux/proc_fs.h> | |
82 | #include <linux/seq_file.h> | |
83 | #include <linux/poll.h> | |
84 | #include <linux/module.h> | |
85 | #include <linux/init.h> | |
905db440 | 86 | #include <linux/mutex.h> |
05423b24 | 87 | #include <linux/if_vlan.h> |
bfd5f4a3 | 88 | #include <linux/virtio_net.h> |
ed85b565 | 89 | #include <linux/errqueue.h> |
614f60fa | 90 | #include <linux/net_tstamp.h> |
5df0ddfb | 91 | #include <linux/reciprocal_div.h> |
1da177e4 LT |
92 | #ifdef CONFIG_INET |
93 | #include <net/inet_common.h> | |
94 | #endif | |
95 | ||
2787b04b PE |
96 | #include "internal.h" |
97 | ||
1da177e4 LT |
98 | /* |
99 | Assumptions: | |
100 | - if device has no dev->hard_header routine, it adds and removes ll header | |
101 | inside itself. In this case ll header is invisible outside of device, | |
102 | but higher levels still should reserve dev->hard_header_len. | |
103 | Some devices are enough clever to reallocate skb, when header | |
104 | will not fit to reserved space (tunnel), another ones are silly | |
105 | (PPP). | |
106 | - packet socket receives packets with pulled ll header, | |
107 | so that SOCK_RAW should push it back. | |
108 | ||
109 | On receive: | |
110 | ----------- | |
111 | ||
112 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
113 | mac_header -> ll header |
114 | data -> data | |
1da177e4 LT |
115 | |
116 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
117 | mac_header -> ll header |
118 | data -> ll header | |
1da177e4 LT |
119 | |
120 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
121 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
122 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 123 | assymetry between rx and tx paths. |
b0e380b1 | 124 | data -> data |
1da177e4 LT |
125 | |
126 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
127 | mac_header -> data. ll header is still not built! |
128 | data -> data | |
1da177e4 LT |
129 | |
130 | Resume | |
131 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
132 | ||
133 | ||
134 | On transmit: | |
135 | ------------ | |
136 | ||
137 | dev->hard_header != NULL | |
b0e380b1 ACM |
138 | mac_header -> ll header |
139 | data -> ll header | |
1da177e4 LT |
140 | |
141 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
142 | mac_header -> data |
143 | data -> data | |
1da177e4 LT |
144 | |
145 | We should set nh.raw on output to correct posistion, | |
146 | packet classifier depends on it. | |
147 | */ | |
148 | ||
1da177e4 LT |
149 | /* Private packet socket structures. */ |
150 | ||
0fb375fb EB |
151 | /* identical to struct packet_mreq except it has |
152 | * a longer address field. | |
153 | */ | |
40d4e3df | 154 | struct packet_mreq_max { |
0fb375fb EB |
155 | int mr_ifindex; |
156 | unsigned short mr_type; | |
157 | unsigned short mr_alen; | |
158 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 159 | }; |
a2efcfa0 | 160 | |
184f489e DB |
161 | union tpacket_uhdr { |
162 | struct tpacket_hdr *h1; | |
163 | struct tpacket2_hdr *h2; | |
164 | struct tpacket3_hdr *h3; | |
165 | void *raw; | |
166 | }; | |
167 | ||
f6fb8f10 | 168 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
69e3c75f JB |
169 | int closing, int tx_ring); |
170 | ||
f6fb8f10 | 171 | #define V3_ALIGNMENT (8) |
172 | ||
bc59ba39 | 173 | #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT)) |
f6fb8f10 | 174 | |
175 | #define BLK_PLUS_PRIV(sz_of_priv) \ | |
176 | (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT)) | |
177 | ||
f6fb8f10 | 178 | #define PGV_FROM_VMALLOC 1 |
69e3c75f | 179 | |
f6fb8f10 | 180 | #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status) |
181 | #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts) | |
182 | #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt) | |
183 | #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len) | |
184 | #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num) | |
185 | #define BLOCK_O2PRIV(x) ((x)->offset_to_priv) | |
186 | #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x))) | |
187 | ||
69e3c75f JB |
188 | struct packet_sock; |
189 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
77f65ebd WB |
190 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
191 | struct packet_type *pt, struct net_device *orig_dev); | |
1da177e4 | 192 | |
f6fb8f10 | 193 | static void *packet_previous_frame(struct packet_sock *po, |
194 | struct packet_ring_buffer *rb, | |
195 | int status); | |
196 | static void packet_increment_head(struct packet_ring_buffer *buff); | |
bc59ba39 | 197 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *, |
198 | struct tpacket_block_desc *); | |
199 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *, | |
f6fb8f10 | 200 | struct packet_sock *); |
bc59ba39 | 201 | static void prb_retire_current_block(struct tpacket_kbdq_core *, |
f6fb8f10 | 202 | struct packet_sock *, unsigned int status); |
bc59ba39 | 203 | static int prb_queue_frozen(struct tpacket_kbdq_core *); |
204 | static void prb_open_block(struct tpacket_kbdq_core *, | |
205 | struct tpacket_block_desc *); | |
f6fb8f10 | 206 | static void prb_retire_rx_blk_timer_expired(unsigned long); |
bc59ba39 | 207 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *); |
208 | static void prb_init_blk_timer(struct packet_sock *, | |
209 | struct tpacket_kbdq_core *, | |
210 | void (*func) (unsigned long)); | |
211 | static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *); | |
212 | static void prb_clear_rxhash(struct tpacket_kbdq_core *, | |
213 | struct tpacket3_hdr *); | |
214 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *, | |
215 | struct tpacket3_hdr *); | |
1da177e4 LT |
216 | static void packet_flush_mclist(struct sock *sk); |
217 | ||
ffbc6111 HX |
218 | struct packet_skb_cb { |
219 | unsigned int origlen; | |
220 | union { | |
221 | struct sockaddr_pkt pkt; | |
222 | struct sockaddr_ll ll; | |
223 | } sa; | |
224 | }; | |
225 | ||
226 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) | |
8dc41944 | 227 | |
bc59ba39 | 228 | #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc)) |
f6fb8f10 | 229 | #define GET_PBLOCK_DESC(x, bid) \ |
bc59ba39 | 230 | ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer)) |
f6fb8f10 | 231 | #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \ |
bc59ba39 | 232 | ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer)) |
f6fb8f10 | 233 | #define GET_NEXT_PRB_BLK_NUM(x) \ |
234 | (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \ | |
235 | ((x)->kactive_blk_num+1) : 0) | |
236 | ||
dc99f600 DM |
237 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po); |
238 | static void __fanout_link(struct sock *sk, struct packet_sock *po); | |
239 | ||
ce06b03e DM |
240 | /* register_prot_hook must be invoked with the po->bind_lock held, |
241 | * or from a context in which asynchronous accesses to the packet | |
242 | * socket is not possible (packet_create()). | |
243 | */ | |
244 | static void register_prot_hook(struct sock *sk) | |
245 | { | |
246 | struct packet_sock *po = pkt_sk(sk); | |
e40526cb | 247 | |
ce06b03e | 248 | if (!po->running) { |
e40526cb | 249 | if (po->fanout) { |
dc99f600 | 250 | __fanout_link(sk, po); |
e40526cb | 251 | } else { |
dc99f600 | 252 | dev_add_pack(&po->prot_hook); |
e40526cb DB |
253 | rcu_assign_pointer(po->cached_dev, po->prot_hook.dev); |
254 | } | |
255 | ||
ce06b03e DM |
256 | sock_hold(sk); |
257 | po->running = 1; | |
258 | } | |
259 | } | |
260 | ||
261 | /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock | |
262 | * held. If the sync parameter is true, we will temporarily drop | |
263 | * the po->bind_lock and do a synchronize_net to make sure no | |
264 | * asynchronous packet processing paths still refer to the elements | |
265 | * of po->prot_hook. If the sync parameter is false, it is the | |
266 | * callers responsibility to take care of this. | |
267 | */ | |
268 | static void __unregister_prot_hook(struct sock *sk, bool sync) | |
269 | { | |
270 | struct packet_sock *po = pkt_sk(sk); | |
271 | ||
272 | po->running = 0; | |
e40526cb | 273 | if (po->fanout) { |
dc99f600 | 274 | __fanout_unlink(sk, po); |
e40526cb | 275 | } else { |
dc99f600 | 276 | __dev_remove_pack(&po->prot_hook); |
e40526cb DB |
277 | RCU_INIT_POINTER(po->cached_dev, NULL); |
278 | } | |
279 | ||
ce06b03e DM |
280 | __sock_put(sk); |
281 | ||
282 | if (sync) { | |
283 | spin_unlock(&po->bind_lock); | |
284 | synchronize_net(); | |
285 | spin_lock(&po->bind_lock); | |
286 | } | |
287 | } | |
288 | ||
289 | static void unregister_prot_hook(struct sock *sk, bool sync) | |
290 | { | |
291 | struct packet_sock *po = pkt_sk(sk); | |
292 | ||
293 | if (po->running) | |
294 | __unregister_prot_hook(sk, sync); | |
295 | } | |
296 | ||
f6dafa95 | 297 | static inline __pure struct page *pgv_to_page(void *addr) |
0af55bb5 CG |
298 | { |
299 | if (is_vmalloc_addr(addr)) | |
300 | return vmalloc_to_page(addr); | |
301 | return virt_to_page(addr); | |
302 | } | |
303 | ||
69e3c75f | 304 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 305 | { |
184f489e | 306 | union tpacket_uhdr h; |
1da177e4 | 307 | |
69e3c75f | 308 | h.raw = frame; |
bbd6ef87 PM |
309 | switch (po->tp_version) { |
310 | case TPACKET_V1: | |
69e3c75f | 311 | h.h1->tp_status = status; |
0af55bb5 | 312 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
bbd6ef87 PM |
313 | break; |
314 | case TPACKET_V2: | |
69e3c75f | 315 | h.h2->tp_status = status; |
0af55bb5 | 316 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
bbd6ef87 | 317 | break; |
f6fb8f10 | 318 | case TPACKET_V3: |
69e3c75f | 319 | default: |
f6fb8f10 | 320 | WARN(1, "TPACKET version not supported.\n"); |
69e3c75f | 321 | BUG(); |
bbd6ef87 | 322 | } |
69e3c75f JB |
323 | |
324 | smp_wmb(); | |
bbd6ef87 PM |
325 | } |
326 | ||
69e3c75f | 327 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 | 328 | { |
184f489e | 329 | union tpacket_uhdr h; |
bbd6ef87 | 330 | |
69e3c75f JB |
331 | smp_rmb(); |
332 | ||
bbd6ef87 PM |
333 | h.raw = frame; |
334 | switch (po->tp_version) { | |
335 | case TPACKET_V1: | |
0af55bb5 | 336 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
69e3c75f | 337 | return h.h1->tp_status; |
bbd6ef87 | 338 | case TPACKET_V2: |
0af55bb5 | 339 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
69e3c75f | 340 | return h.h2->tp_status; |
f6fb8f10 | 341 | case TPACKET_V3: |
69e3c75f | 342 | default: |
f6fb8f10 | 343 | WARN(1, "TPACKET version not supported.\n"); |
69e3c75f JB |
344 | BUG(); |
345 | return 0; | |
bbd6ef87 | 346 | } |
1da177e4 | 347 | } |
69e3c75f | 348 | |
b9c32fb2 DB |
349 | static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts, |
350 | unsigned int flags) | |
7a51384c DB |
351 | { |
352 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); | |
353 | ||
354 | if (shhwtstamps) { | |
355 | if ((flags & SOF_TIMESTAMPING_SYS_HARDWARE) && | |
356 | ktime_to_timespec_cond(shhwtstamps->syststamp, ts)) | |
b9c32fb2 | 357 | return TP_STATUS_TS_SYS_HARDWARE; |
7a51384c DB |
358 | if ((flags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
359 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts)) | |
b9c32fb2 | 360 | return TP_STATUS_TS_RAW_HARDWARE; |
7a51384c DB |
361 | } |
362 | ||
363 | if (ktime_to_timespec_cond(skb->tstamp, ts)) | |
b9c32fb2 | 364 | return TP_STATUS_TS_SOFTWARE; |
7a51384c | 365 | |
b9c32fb2 | 366 | return 0; |
7a51384c DB |
367 | } |
368 | ||
b9c32fb2 DB |
369 | static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame, |
370 | struct sk_buff *skb) | |
2e31396f WB |
371 | { |
372 | union tpacket_uhdr h; | |
373 | struct timespec ts; | |
b9c32fb2 | 374 | __u32 ts_status; |
2e31396f | 375 | |
b9c32fb2 DB |
376 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
377 | return 0; | |
2e31396f WB |
378 | |
379 | h.raw = frame; | |
380 | switch (po->tp_version) { | |
381 | case TPACKET_V1: | |
382 | h.h1->tp_sec = ts.tv_sec; | |
383 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; | |
384 | break; | |
385 | case TPACKET_V2: | |
386 | h.h2->tp_sec = ts.tv_sec; | |
387 | h.h2->tp_nsec = ts.tv_nsec; | |
388 | break; | |
389 | case TPACKET_V3: | |
390 | default: | |
391 | WARN(1, "TPACKET version not supported.\n"); | |
392 | BUG(); | |
393 | } | |
394 | ||
395 | /* one flush is safe, as both fields always lie on the same cacheline */ | |
396 | flush_dcache_page(pgv_to_page(&h.h1->tp_sec)); | |
397 | smp_wmb(); | |
b9c32fb2 DB |
398 | |
399 | return ts_status; | |
2e31396f WB |
400 | } |
401 | ||
69e3c75f JB |
402 | static void *packet_lookup_frame(struct packet_sock *po, |
403 | struct packet_ring_buffer *rb, | |
404 | unsigned int position, | |
405 | int status) | |
406 | { | |
407 | unsigned int pg_vec_pos, frame_offset; | |
184f489e | 408 | union tpacket_uhdr h; |
69e3c75f JB |
409 | |
410 | pg_vec_pos = position / rb->frames_per_block; | |
411 | frame_offset = position % rb->frames_per_block; | |
412 | ||
0e3125c7 NH |
413 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
414 | (frame_offset * rb->frame_size); | |
69e3c75f JB |
415 | |
416 | if (status != __packet_get_status(po, h.raw)) | |
417 | return NULL; | |
418 | ||
419 | return h.raw; | |
420 | } | |
421 | ||
eea49cc9 | 422 | static void *packet_current_frame(struct packet_sock *po, |
69e3c75f JB |
423 | struct packet_ring_buffer *rb, |
424 | int status) | |
425 | { | |
426 | return packet_lookup_frame(po, rb, rb->head, status); | |
427 | } | |
428 | ||
bc59ba39 | 429 | static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 430 | { |
431 | del_timer_sync(&pkc->retire_blk_timer); | |
432 | } | |
433 | ||
434 | static void prb_shutdown_retire_blk_timer(struct packet_sock *po, | |
435 | int tx_ring, | |
436 | struct sk_buff_head *rb_queue) | |
437 | { | |
bc59ba39 | 438 | struct tpacket_kbdq_core *pkc; |
f6fb8f10 | 439 | |
440 | pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc; | |
441 | ||
ec6f809f | 442 | spin_lock_bh(&rb_queue->lock); |
f6fb8f10 | 443 | pkc->delete_blk_timer = 1; |
ec6f809f | 444 | spin_unlock_bh(&rb_queue->lock); |
f6fb8f10 | 445 | |
446 | prb_del_retire_blk_timer(pkc); | |
447 | } | |
448 | ||
449 | static void prb_init_blk_timer(struct packet_sock *po, | |
bc59ba39 | 450 | struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 451 | void (*func) (unsigned long)) |
452 | { | |
453 | init_timer(&pkc->retire_blk_timer); | |
454 | pkc->retire_blk_timer.data = (long)po; | |
455 | pkc->retire_blk_timer.function = func; | |
456 | pkc->retire_blk_timer.expires = jiffies; | |
457 | } | |
458 | ||
459 | static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring) | |
460 | { | |
bc59ba39 | 461 | struct tpacket_kbdq_core *pkc; |
f6fb8f10 | 462 | |
463 | if (tx_ring) | |
464 | BUG(); | |
465 | ||
466 | pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc; | |
467 | prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired); | |
468 | } | |
469 | ||
470 | static int prb_calc_retire_blk_tmo(struct packet_sock *po, | |
471 | int blk_size_in_bytes) | |
472 | { | |
473 | struct net_device *dev; | |
474 | unsigned int mbits = 0, msec = 0, div = 0, tmo = 0; | |
4bc71cb9 JP |
475 | struct ethtool_cmd ecmd; |
476 | int err; | |
e440cf2c | 477 | u32 speed; |
f6fb8f10 | 478 | |
4bc71cb9 JP |
479 | rtnl_lock(); |
480 | dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex); | |
481 | if (unlikely(!dev)) { | |
482 | rtnl_unlock(); | |
f6fb8f10 | 483 | return DEFAULT_PRB_RETIRE_TOV; |
4bc71cb9 JP |
484 | } |
485 | err = __ethtool_get_settings(dev, &ecmd); | |
e440cf2c | 486 | speed = ethtool_cmd_speed(&ecmd); |
4bc71cb9 JP |
487 | rtnl_unlock(); |
488 | if (!err) { | |
4bc71cb9 JP |
489 | /* |
490 | * If the link speed is so slow you don't really | |
491 | * need to worry about perf anyways | |
492 | */ | |
e440cf2c | 493 | if (speed < SPEED_1000 || speed == SPEED_UNKNOWN) { |
4bc71cb9 | 494 | return DEFAULT_PRB_RETIRE_TOV; |
e440cf2c | 495 | } else { |
496 | msec = 1; | |
497 | div = speed / 1000; | |
f6fb8f10 | 498 | } |
499 | } | |
500 | ||
501 | mbits = (blk_size_in_bytes * 8) / (1024 * 1024); | |
502 | ||
503 | if (div) | |
504 | mbits /= div; | |
505 | ||
506 | tmo = mbits * msec; | |
507 | ||
508 | if (div) | |
509 | return tmo+1; | |
510 | return tmo; | |
511 | } | |
512 | ||
bc59ba39 | 513 | static void prb_init_ft_ops(struct tpacket_kbdq_core *p1, |
f6fb8f10 | 514 | union tpacket_req_u *req_u) |
515 | { | |
516 | p1->feature_req_word = req_u->req3.tp_feature_req_word; | |
517 | } | |
518 | ||
519 | static void init_prb_bdqc(struct packet_sock *po, | |
520 | struct packet_ring_buffer *rb, | |
521 | struct pgv *pg_vec, | |
522 | union tpacket_req_u *req_u, int tx_ring) | |
523 | { | |
bc59ba39 | 524 | struct tpacket_kbdq_core *p1 = &rb->prb_bdqc; |
525 | struct tpacket_block_desc *pbd; | |
f6fb8f10 | 526 | |
527 | memset(p1, 0x0, sizeof(*p1)); | |
528 | ||
529 | p1->knxt_seq_num = 1; | |
530 | p1->pkbdq = pg_vec; | |
bc59ba39 | 531 | pbd = (struct tpacket_block_desc *)pg_vec[0].buffer; |
e3192690 | 532 | p1->pkblk_start = pg_vec[0].buffer; |
f6fb8f10 | 533 | p1->kblk_size = req_u->req3.tp_block_size; |
534 | p1->knum_blocks = req_u->req3.tp_block_nr; | |
535 | p1->hdrlen = po->tp_hdrlen; | |
536 | p1->version = po->tp_version; | |
537 | p1->last_kactive_blk_num = 0; | |
ee80fbf3 | 538 | po->stats.stats3.tp_freeze_q_cnt = 0; |
f6fb8f10 | 539 | if (req_u->req3.tp_retire_blk_tov) |
540 | p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov; | |
541 | else | |
542 | p1->retire_blk_tov = prb_calc_retire_blk_tmo(po, | |
543 | req_u->req3.tp_block_size); | |
544 | p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov); | |
545 | p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv; | |
546 | ||
547 | prb_init_ft_ops(p1, req_u); | |
548 | prb_setup_retire_blk_timer(po, tx_ring); | |
549 | prb_open_block(p1, pbd); | |
550 | } | |
551 | ||
552 | /* Do NOT update the last_blk_num first. | |
553 | * Assumes sk_buff_head lock is held. | |
554 | */ | |
bc59ba39 | 555 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 556 | { |
557 | mod_timer(&pkc->retire_blk_timer, | |
558 | jiffies + pkc->tov_in_jiffies); | |
559 | pkc->last_kactive_blk_num = pkc->kactive_blk_num; | |
560 | } | |
561 | ||
562 | /* | |
563 | * Timer logic: | |
564 | * 1) We refresh the timer only when we open a block. | |
565 | * By doing this we don't waste cycles refreshing the timer | |
566 | * on packet-by-packet basis. | |
567 | * | |
568 | * With a 1MB block-size, on a 1Gbps line, it will take | |
569 | * i) ~8 ms to fill a block + ii) memcpy etc. | |
570 | * In this cut we are not accounting for the memcpy time. | |
571 | * | |
572 | * So, if the user sets the 'tmo' to 10ms then the timer | |
573 | * will never fire while the block is still getting filled | |
574 | * (which is what we want). However, the user could choose | |
575 | * to close a block early and that's fine. | |
576 | * | |
577 | * But when the timer does fire, we check whether or not to refresh it. | |
578 | * Since the tmo granularity is in msecs, it is not too expensive | |
579 | * to refresh the timer, lets say every '8' msecs. | |
580 | * Either the user can set the 'tmo' or we can derive it based on | |
581 | * a) line-speed and b) block-size. | |
582 | * prb_calc_retire_blk_tmo() calculates the tmo. | |
583 | * | |
584 | */ | |
585 | static void prb_retire_rx_blk_timer_expired(unsigned long data) | |
586 | { | |
587 | struct packet_sock *po = (struct packet_sock *)data; | |
bc59ba39 | 588 | struct tpacket_kbdq_core *pkc = &po->rx_ring.prb_bdqc; |
f6fb8f10 | 589 | unsigned int frozen; |
bc59ba39 | 590 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 591 | |
592 | spin_lock(&po->sk.sk_receive_queue.lock); | |
593 | ||
594 | frozen = prb_queue_frozen(pkc); | |
595 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
596 | ||
597 | if (unlikely(pkc->delete_blk_timer)) | |
598 | goto out; | |
599 | ||
600 | /* We only need to plug the race when the block is partially filled. | |
601 | * tpacket_rcv: | |
602 | * lock(); increment BLOCK_NUM_PKTS; unlock() | |
603 | * copy_bits() is in progress ... | |
604 | * timer fires on other cpu: | |
605 | * we can't retire the current block because copy_bits | |
606 | * is in progress. | |
607 | * | |
608 | */ | |
609 | if (BLOCK_NUM_PKTS(pbd)) { | |
610 | while (atomic_read(&pkc->blk_fill_in_prog)) { | |
611 | /* Waiting for skb_copy_bits to finish... */ | |
612 | cpu_relax(); | |
613 | } | |
614 | } | |
615 | ||
616 | if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) { | |
617 | if (!frozen) { | |
618 | prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO); | |
619 | if (!prb_dispatch_next_block(pkc, po)) | |
620 | goto refresh_timer; | |
621 | else | |
622 | goto out; | |
623 | } else { | |
624 | /* Case 1. Queue was frozen because user-space was | |
625 | * lagging behind. | |
626 | */ | |
627 | if (prb_curr_blk_in_use(pkc, pbd)) { | |
628 | /* | |
629 | * Ok, user-space is still behind. | |
630 | * So just refresh the timer. | |
631 | */ | |
632 | goto refresh_timer; | |
633 | } else { | |
634 | /* Case 2. queue was frozen,user-space caught up, | |
635 | * now the link went idle && the timer fired. | |
636 | * We don't have a block to close.So we open this | |
637 | * block and restart the timer. | |
638 | * opening a block thaws the queue,restarts timer | |
639 | * Thawing/timer-refresh is a side effect. | |
640 | */ | |
641 | prb_open_block(pkc, pbd); | |
642 | goto out; | |
643 | } | |
644 | } | |
645 | } | |
646 | ||
647 | refresh_timer: | |
648 | _prb_refresh_rx_retire_blk_timer(pkc); | |
649 | ||
650 | out: | |
651 | spin_unlock(&po->sk.sk_receive_queue.lock); | |
652 | } | |
653 | ||
eea49cc9 | 654 | static void prb_flush_block(struct tpacket_kbdq_core *pkc1, |
bc59ba39 | 655 | struct tpacket_block_desc *pbd1, __u32 status) |
f6fb8f10 | 656 | { |
657 | /* Flush everything minus the block header */ | |
658 | ||
659 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 | |
660 | u8 *start, *end; | |
661 | ||
662 | start = (u8 *)pbd1; | |
663 | ||
664 | /* Skip the block header(we know header WILL fit in 4K) */ | |
665 | start += PAGE_SIZE; | |
666 | ||
667 | end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end); | |
668 | for (; start < end; start += PAGE_SIZE) | |
669 | flush_dcache_page(pgv_to_page(start)); | |
670 | ||
671 | smp_wmb(); | |
672 | #endif | |
673 | ||
674 | /* Now update the block status. */ | |
675 | ||
676 | BLOCK_STATUS(pbd1) = status; | |
677 | ||
678 | /* Flush the block header */ | |
679 | ||
680 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 | |
681 | start = (u8 *)pbd1; | |
682 | flush_dcache_page(pgv_to_page(start)); | |
683 | ||
684 | smp_wmb(); | |
685 | #endif | |
686 | } | |
687 | ||
688 | /* | |
689 | * Side effect: | |
690 | * | |
691 | * 1) flush the block | |
692 | * 2) Increment active_blk_num | |
693 | * | |
694 | * Note:We DONT refresh the timer on purpose. | |
695 | * Because almost always the next block will be opened. | |
696 | */ | |
bc59ba39 | 697 | static void prb_close_block(struct tpacket_kbdq_core *pkc1, |
698 | struct tpacket_block_desc *pbd1, | |
f6fb8f10 | 699 | struct packet_sock *po, unsigned int stat) |
700 | { | |
701 | __u32 status = TP_STATUS_USER | stat; | |
702 | ||
703 | struct tpacket3_hdr *last_pkt; | |
bc59ba39 | 704 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
f6fb8f10 | 705 | |
ee80fbf3 | 706 | if (po->stats.stats3.tp_drops) |
f6fb8f10 | 707 | status |= TP_STATUS_LOSING; |
708 | ||
709 | last_pkt = (struct tpacket3_hdr *)pkc1->prev; | |
710 | last_pkt->tp_next_offset = 0; | |
711 | ||
712 | /* Get the ts of the last pkt */ | |
713 | if (BLOCK_NUM_PKTS(pbd1)) { | |
714 | h1->ts_last_pkt.ts_sec = last_pkt->tp_sec; | |
715 | h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec; | |
716 | } else { | |
717 | /* Ok, we tmo'd - so get the current time */ | |
718 | struct timespec ts; | |
719 | getnstimeofday(&ts); | |
720 | h1->ts_last_pkt.ts_sec = ts.tv_sec; | |
721 | h1->ts_last_pkt.ts_nsec = ts.tv_nsec; | |
722 | } | |
723 | ||
724 | smp_wmb(); | |
725 | ||
726 | /* Flush the block */ | |
727 | prb_flush_block(pkc1, pbd1, status); | |
728 | ||
729 | pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1); | |
730 | } | |
731 | ||
eea49cc9 | 732 | static void prb_thaw_queue(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 733 | { |
734 | pkc->reset_pending_on_curr_blk = 0; | |
735 | } | |
736 | ||
737 | /* | |
738 | * Side effect of opening a block: | |
739 | * | |
740 | * 1) prb_queue is thawed. | |
741 | * 2) retire_blk_timer is refreshed. | |
742 | * | |
743 | */ | |
bc59ba39 | 744 | static void prb_open_block(struct tpacket_kbdq_core *pkc1, |
745 | struct tpacket_block_desc *pbd1) | |
f6fb8f10 | 746 | { |
747 | struct timespec ts; | |
bc59ba39 | 748 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
f6fb8f10 | 749 | |
750 | smp_rmb(); | |
751 | ||
8da3056c DB |
752 | /* We could have just memset this but we will lose the |
753 | * flexibility of making the priv area sticky | |
754 | */ | |
f6fb8f10 | 755 | |
8da3056c DB |
756 | BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++; |
757 | BLOCK_NUM_PKTS(pbd1) = 0; | |
758 | BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
f6fb8f10 | 759 | |
8da3056c DB |
760 | getnstimeofday(&ts); |
761 | ||
762 | h1->ts_first_pkt.ts_sec = ts.tv_sec; | |
763 | h1->ts_first_pkt.ts_nsec = ts.tv_nsec; | |
f6fb8f10 | 764 | |
8da3056c DB |
765 | pkc1->pkblk_start = (char *)pbd1; |
766 | pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
767 | ||
768 | BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
769 | BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN; | |
770 | ||
771 | pbd1->version = pkc1->version; | |
772 | pkc1->prev = pkc1->nxt_offset; | |
773 | pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size; | |
774 | ||
775 | prb_thaw_queue(pkc1); | |
776 | _prb_refresh_rx_retire_blk_timer(pkc1); | |
777 | ||
778 | smp_wmb(); | |
f6fb8f10 | 779 | } |
780 | ||
781 | /* | |
782 | * Queue freeze logic: | |
783 | * 1) Assume tp_block_nr = 8 blocks. | |
784 | * 2) At time 't0', user opens Rx ring. | |
785 | * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7 | |
786 | * 4) user-space is either sleeping or processing block '0'. | |
787 | * 5) tpacket_rcv is currently filling block '7', since there is no space left, | |
788 | * it will close block-7,loop around and try to fill block '0'. | |
789 | * call-flow: | |
790 | * __packet_lookup_frame_in_block | |
791 | * prb_retire_current_block() | |
792 | * prb_dispatch_next_block() | |
793 | * |->(BLOCK_STATUS == USER) evaluates to true | |
794 | * 5.1) Since block-0 is currently in-use, we just freeze the queue. | |
795 | * 6) Now there are two cases: | |
796 | * 6.1) Link goes idle right after the queue is frozen. | |
797 | * But remember, the last open_block() refreshed the timer. | |
798 | * When this timer expires,it will refresh itself so that we can | |
799 | * re-open block-0 in near future. | |
800 | * 6.2) Link is busy and keeps on receiving packets. This is a simple | |
801 | * case and __packet_lookup_frame_in_block will check if block-0 | |
802 | * is free and can now be re-used. | |
803 | */ | |
eea49cc9 | 804 | static void prb_freeze_queue(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 805 | struct packet_sock *po) |
806 | { | |
807 | pkc->reset_pending_on_curr_blk = 1; | |
ee80fbf3 | 808 | po->stats.stats3.tp_freeze_q_cnt++; |
f6fb8f10 | 809 | } |
810 | ||
811 | #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT)) | |
812 | ||
813 | /* | |
814 | * If the next block is free then we will dispatch it | |
815 | * and return a good offset. | |
816 | * Else, we will freeze the queue. | |
817 | * So, caller must check the return value. | |
818 | */ | |
bc59ba39 | 819 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 820 | struct packet_sock *po) |
821 | { | |
bc59ba39 | 822 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 823 | |
824 | smp_rmb(); | |
825 | ||
826 | /* 1. Get current block num */ | |
827 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
828 | ||
829 | /* 2. If this block is currently in_use then freeze the queue */ | |
830 | if (TP_STATUS_USER & BLOCK_STATUS(pbd)) { | |
831 | prb_freeze_queue(pkc, po); | |
832 | return NULL; | |
833 | } | |
834 | ||
835 | /* | |
836 | * 3. | |
837 | * open this block and return the offset where the first packet | |
838 | * needs to get stored. | |
839 | */ | |
840 | prb_open_block(pkc, pbd); | |
841 | return (void *)pkc->nxt_offset; | |
842 | } | |
843 | ||
bc59ba39 | 844 | static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 845 | struct packet_sock *po, unsigned int status) |
846 | { | |
bc59ba39 | 847 | struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
f6fb8f10 | 848 | |
849 | /* retire/close the current block */ | |
850 | if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) { | |
851 | /* | |
852 | * Plug the case where copy_bits() is in progress on | |
853 | * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't | |
854 | * have space to copy the pkt in the current block and | |
855 | * called prb_retire_current_block() | |
856 | * | |
857 | * We don't need to worry about the TMO case because | |
858 | * the timer-handler already handled this case. | |
859 | */ | |
860 | if (!(status & TP_STATUS_BLK_TMO)) { | |
861 | while (atomic_read(&pkc->blk_fill_in_prog)) { | |
862 | /* Waiting for skb_copy_bits to finish... */ | |
863 | cpu_relax(); | |
864 | } | |
865 | } | |
866 | prb_close_block(pkc, pbd, po, status); | |
867 | return; | |
868 | } | |
f6fb8f10 | 869 | } |
870 | ||
eea49cc9 | 871 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc, |
bc59ba39 | 872 | struct tpacket_block_desc *pbd) |
f6fb8f10 | 873 | { |
874 | return TP_STATUS_USER & BLOCK_STATUS(pbd); | |
875 | } | |
876 | ||
eea49cc9 | 877 | static int prb_queue_frozen(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 878 | { |
879 | return pkc->reset_pending_on_curr_blk; | |
880 | } | |
881 | ||
eea49cc9 | 882 | static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb) |
f6fb8f10 | 883 | { |
bc59ba39 | 884 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
f6fb8f10 | 885 | atomic_dec(&pkc->blk_fill_in_prog); |
886 | } | |
887 | ||
eea49cc9 | 888 | static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 889 | struct tpacket3_hdr *ppd) |
890 | { | |
891 | ppd->hv1.tp_rxhash = skb_get_rxhash(pkc->skb); | |
892 | } | |
893 | ||
eea49cc9 | 894 | static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 895 | struct tpacket3_hdr *ppd) |
896 | { | |
897 | ppd->hv1.tp_rxhash = 0; | |
898 | } | |
899 | ||
eea49cc9 | 900 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 901 | struct tpacket3_hdr *ppd) |
902 | { | |
903 | if (vlan_tx_tag_present(pkc->skb)) { | |
904 | ppd->hv1.tp_vlan_tci = vlan_tx_tag_get(pkc->skb); | |
905 | ppd->tp_status = TP_STATUS_VLAN_VALID; | |
906 | } else { | |
9e67030a DB |
907 | ppd->hv1.tp_vlan_tci = 0; |
908 | ppd->tp_status = TP_STATUS_AVAILABLE; | |
f6fb8f10 | 909 | } |
910 | } | |
911 | ||
bc59ba39 | 912 | static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 913 | struct tpacket3_hdr *ppd) |
914 | { | |
915 | prb_fill_vlan_info(pkc, ppd); | |
916 | ||
917 | if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH) | |
918 | prb_fill_rxhash(pkc, ppd); | |
919 | else | |
920 | prb_clear_rxhash(pkc, ppd); | |
921 | } | |
922 | ||
eea49cc9 | 923 | static void prb_fill_curr_block(char *curr, |
bc59ba39 | 924 | struct tpacket_kbdq_core *pkc, |
925 | struct tpacket_block_desc *pbd, | |
f6fb8f10 | 926 | unsigned int len) |
927 | { | |
928 | struct tpacket3_hdr *ppd; | |
929 | ||
930 | ppd = (struct tpacket3_hdr *)curr; | |
931 | ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len); | |
932 | pkc->prev = curr; | |
933 | pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len); | |
934 | BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len); | |
935 | BLOCK_NUM_PKTS(pbd) += 1; | |
936 | atomic_inc(&pkc->blk_fill_in_prog); | |
937 | prb_run_all_ft_ops(pkc, ppd); | |
938 | } | |
939 | ||
940 | /* Assumes caller has the sk->rx_queue.lock */ | |
941 | static void *__packet_lookup_frame_in_block(struct packet_sock *po, | |
942 | struct sk_buff *skb, | |
943 | int status, | |
944 | unsigned int len | |
945 | ) | |
946 | { | |
bc59ba39 | 947 | struct tpacket_kbdq_core *pkc; |
948 | struct tpacket_block_desc *pbd; | |
f6fb8f10 | 949 | char *curr, *end; |
950 | ||
e3192690 | 951 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 952 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
953 | ||
954 | /* Queue is frozen when user space is lagging behind */ | |
955 | if (prb_queue_frozen(pkc)) { | |
956 | /* | |
957 | * Check if that last block which caused the queue to freeze, | |
958 | * is still in_use by user-space. | |
959 | */ | |
960 | if (prb_curr_blk_in_use(pkc, pbd)) { | |
961 | /* Can't record this packet */ | |
962 | return NULL; | |
963 | } else { | |
964 | /* | |
965 | * Ok, the block was released by user-space. | |
966 | * Now let's open that block. | |
967 | * opening a block also thaws the queue. | |
968 | * Thawing is a side effect. | |
969 | */ | |
970 | prb_open_block(pkc, pbd); | |
971 | } | |
972 | } | |
973 | ||
974 | smp_mb(); | |
975 | curr = pkc->nxt_offset; | |
976 | pkc->skb = skb; | |
e3192690 | 977 | end = (char *)pbd + pkc->kblk_size; |
f6fb8f10 | 978 | |
979 | /* first try the current block */ | |
980 | if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) { | |
981 | prb_fill_curr_block(curr, pkc, pbd, len); | |
982 | return (void *)curr; | |
983 | } | |
984 | ||
985 | /* Ok, close the current block */ | |
986 | prb_retire_current_block(pkc, po, 0); | |
987 | ||
988 | /* Now, try to dispatch the next block */ | |
989 | curr = (char *)prb_dispatch_next_block(pkc, po); | |
990 | if (curr) { | |
991 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
992 | prb_fill_curr_block(curr, pkc, pbd, len); | |
993 | return (void *)curr; | |
994 | } | |
995 | ||
996 | /* | |
997 | * No free blocks are available.user_space hasn't caught up yet. | |
998 | * Queue was just frozen and now this packet will get dropped. | |
999 | */ | |
1000 | return NULL; | |
1001 | } | |
1002 | ||
eea49cc9 | 1003 | static void *packet_current_rx_frame(struct packet_sock *po, |
f6fb8f10 | 1004 | struct sk_buff *skb, |
1005 | int status, unsigned int len) | |
1006 | { | |
1007 | char *curr = NULL; | |
1008 | switch (po->tp_version) { | |
1009 | case TPACKET_V1: | |
1010 | case TPACKET_V2: | |
1011 | curr = packet_lookup_frame(po, &po->rx_ring, | |
1012 | po->rx_ring.head, status); | |
1013 | return curr; | |
1014 | case TPACKET_V3: | |
1015 | return __packet_lookup_frame_in_block(po, skb, status, len); | |
1016 | default: | |
1017 | WARN(1, "TPACKET version not supported\n"); | |
1018 | BUG(); | |
99aa3473 | 1019 | return NULL; |
f6fb8f10 | 1020 | } |
1021 | } | |
1022 | ||
eea49cc9 | 1023 | static void *prb_lookup_block(struct packet_sock *po, |
f6fb8f10 | 1024 | struct packet_ring_buffer *rb, |
77f65ebd | 1025 | unsigned int idx, |
f6fb8f10 | 1026 | int status) |
1027 | { | |
bc59ba39 | 1028 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
77f65ebd | 1029 | struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx); |
f6fb8f10 | 1030 | |
1031 | if (status != BLOCK_STATUS(pbd)) | |
1032 | return NULL; | |
1033 | return pbd; | |
1034 | } | |
1035 | ||
eea49cc9 | 1036 | static int prb_previous_blk_num(struct packet_ring_buffer *rb) |
f6fb8f10 | 1037 | { |
1038 | unsigned int prev; | |
1039 | if (rb->prb_bdqc.kactive_blk_num) | |
1040 | prev = rb->prb_bdqc.kactive_blk_num-1; | |
1041 | else | |
1042 | prev = rb->prb_bdqc.knum_blocks-1; | |
1043 | return prev; | |
1044 | } | |
1045 | ||
1046 | /* Assumes caller has held the rx_queue.lock */ | |
eea49cc9 | 1047 | static void *__prb_previous_block(struct packet_sock *po, |
f6fb8f10 | 1048 | struct packet_ring_buffer *rb, |
1049 | int status) | |
1050 | { | |
1051 | unsigned int previous = prb_previous_blk_num(rb); | |
1052 | return prb_lookup_block(po, rb, previous, status); | |
1053 | } | |
1054 | ||
eea49cc9 | 1055 | static void *packet_previous_rx_frame(struct packet_sock *po, |
f6fb8f10 | 1056 | struct packet_ring_buffer *rb, |
1057 | int status) | |
1058 | { | |
1059 | if (po->tp_version <= TPACKET_V2) | |
1060 | return packet_previous_frame(po, rb, status); | |
1061 | ||
1062 | return __prb_previous_block(po, rb, status); | |
1063 | } | |
1064 | ||
eea49cc9 | 1065 | static void packet_increment_rx_head(struct packet_sock *po, |
f6fb8f10 | 1066 | struct packet_ring_buffer *rb) |
1067 | { | |
1068 | switch (po->tp_version) { | |
1069 | case TPACKET_V1: | |
1070 | case TPACKET_V2: | |
1071 | return packet_increment_head(rb); | |
1072 | case TPACKET_V3: | |
1073 | default: | |
1074 | WARN(1, "TPACKET version not supported.\n"); | |
1075 | BUG(); | |
1076 | return; | |
1077 | } | |
1078 | } | |
1079 | ||
eea49cc9 | 1080 | static void *packet_previous_frame(struct packet_sock *po, |
69e3c75f JB |
1081 | struct packet_ring_buffer *rb, |
1082 | int status) | |
1083 | { | |
1084 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
1085 | return packet_lookup_frame(po, rb, previous, status); | |
1086 | } | |
1087 | ||
eea49cc9 | 1088 | static void packet_increment_head(struct packet_ring_buffer *buff) |
69e3c75f JB |
1089 | { |
1090 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
1091 | } | |
1092 | ||
77f65ebd WB |
1093 | static bool packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) |
1094 | { | |
1095 | struct sock *sk = &po->sk; | |
1096 | bool has_room; | |
1097 | ||
1098 | if (po->prot_hook.func != tpacket_rcv) | |
1099 | return (atomic_read(&sk->sk_rmem_alloc) + skb->truesize) | |
1100 | <= sk->sk_rcvbuf; | |
1101 | ||
1102 | spin_lock(&sk->sk_receive_queue.lock); | |
1103 | if (po->tp_version == TPACKET_V3) | |
1104 | has_room = prb_lookup_block(po, &po->rx_ring, | |
1105 | po->rx_ring.prb_bdqc.kactive_blk_num, | |
1106 | TP_STATUS_KERNEL); | |
1107 | else | |
1108 | has_room = packet_lookup_frame(po, &po->rx_ring, | |
1109 | po->rx_ring.head, | |
1110 | TP_STATUS_KERNEL); | |
1111 | spin_unlock(&sk->sk_receive_queue.lock); | |
1112 | ||
1113 | return has_room; | |
1114 | } | |
1115 | ||
1da177e4 LT |
1116 | static void packet_sock_destruct(struct sock *sk) |
1117 | { | |
ed85b565 RC |
1118 | skb_queue_purge(&sk->sk_error_queue); |
1119 | ||
547b792c IJ |
1120 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
1121 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
1122 | |
1123 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 1124 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
1125 | return; |
1126 | } | |
1127 | ||
17ab56a2 | 1128 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
1129 | } |
1130 | ||
dc99f600 DM |
1131 | static int fanout_rr_next(struct packet_fanout *f, unsigned int num) |
1132 | { | |
1133 | int x = atomic_read(&f->rr_cur) + 1; | |
1134 | ||
1135 | if (x >= num) | |
1136 | x = 0; | |
1137 | ||
1138 | return x; | |
1139 | } | |
1140 | ||
77f65ebd WB |
1141 | static unsigned int fanout_demux_hash(struct packet_fanout *f, |
1142 | struct sk_buff *skb, | |
1143 | unsigned int num) | |
dc99f600 | 1144 | { |
f55d112e | 1145 | return reciprocal_divide(skb->rxhash, num); |
dc99f600 DM |
1146 | } |
1147 | ||
77f65ebd WB |
1148 | static unsigned int fanout_demux_lb(struct packet_fanout *f, |
1149 | struct sk_buff *skb, | |
1150 | unsigned int num) | |
dc99f600 DM |
1151 | { |
1152 | int cur, old; | |
1153 | ||
1154 | cur = atomic_read(&f->rr_cur); | |
1155 | while ((old = atomic_cmpxchg(&f->rr_cur, cur, | |
1156 | fanout_rr_next(f, num))) != cur) | |
1157 | cur = old; | |
77f65ebd WB |
1158 | return cur; |
1159 | } | |
1160 | ||
1161 | static unsigned int fanout_demux_cpu(struct packet_fanout *f, | |
1162 | struct sk_buff *skb, | |
1163 | unsigned int num) | |
1164 | { | |
1165 | return smp_processor_id() % num; | |
dc99f600 DM |
1166 | } |
1167 | ||
5df0ddfb DB |
1168 | static unsigned int fanout_demux_rnd(struct packet_fanout *f, |
1169 | struct sk_buff *skb, | |
1170 | unsigned int num) | |
1171 | { | |
1172 | return reciprocal_divide(prandom_u32(), num); | |
1173 | } | |
1174 | ||
77f65ebd WB |
1175 | static unsigned int fanout_demux_rollover(struct packet_fanout *f, |
1176 | struct sk_buff *skb, | |
1177 | unsigned int idx, unsigned int skip, | |
1178 | unsigned int num) | |
95ec3eb4 | 1179 | { |
77f65ebd | 1180 | unsigned int i, j; |
95ec3eb4 | 1181 | |
77f65ebd WB |
1182 | i = j = min_t(int, f->next[idx], num - 1); |
1183 | do { | |
1184 | if (i != skip && packet_rcv_has_room(pkt_sk(f->arr[i]), skb)) { | |
1185 | if (i != j) | |
1186 | f->next[idx] = i; | |
1187 | return i; | |
1188 | } | |
1189 | if (++i == num) | |
1190 | i = 0; | |
1191 | } while (i != j); | |
1192 | ||
1193 | return idx; | |
1194 | } | |
1195 | ||
1196 | static bool fanout_has_flag(struct packet_fanout *f, u16 flag) | |
1197 | { | |
1198 | return f->flags & (flag >> 8); | |
95ec3eb4 DM |
1199 | } |
1200 | ||
95ec3eb4 DM |
1201 | static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, |
1202 | struct packet_type *pt, struct net_device *orig_dev) | |
dc99f600 DM |
1203 | { |
1204 | struct packet_fanout *f = pt->af_packet_priv; | |
1205 | unsigned int num = f->num_members; | |
1206 | struct packet_sock *po; | |
77f65ebd | 1207 | unsigned int idx; |
dc99f600 DM |
1208 | |
1209 | if (!net_eq(dev_net(dev), read_pnet(&f->net)) || | |
1210 | !num) { | |
1211 | kfree_skb(skb); | |
1212 | return 0; | |
1213 | } | |
1214 | ||
95ec3eb4 DM |
1215 | switch (f->type) { |
1216 | case PACKET_FANOUT_HASH: | |
1217 | default: | |
77f65ebd | 1218 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) { |
bc416d97 | 1219 | skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET); |
95ec3eb4 DM |
1220 | if (!skb) |
1221 | return 0; | |
1222 | } | |
1223 | skb_get_rxhash(skb); | |
77f65ebd | 1224 | idx = fanout_demux_hash(f, skb, num); |
95ec3eb4 DM |
1225 | break; |
1226 | case PACKET_FANOUT_LB: | |
77f65ebd | 1227 | idx = fanout_demux_lb(f, skb, num); |
95ec3eb4 DM |
1228 | break; |
1229 | case PACKET_FANOUT_CPU: | |
77f65ebd WB |
1230 | idx = fanout_demux_cpu(f, skb, num); |
1231 | break; | |
5df0ddfb DB |
1232 | case PACKET_FANOUT_RND: |
1233 | idx = fanout_demux_rnd(f, skb, num); | |
1234 | break; | |
77f65ebd WB |
1235 | case PACKET_FANOUT_ROLLOVER: |
1236 | idx = fanout_demux_rollover(f, skb, 0, (unsigned int) -1, num); | |
95ec3eb4 | 1237 | break; |
dc99f600 DM |
1238 | } |
1239 | ||
77f65ebd WB |
1240 | po = pkt_sk(f->arr[idx]); |
1241 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER) && | |
1242 | unlikely(!packet_rcv_has_room(po, skb))) { | |
1243 | idx = fanout_demux_rollover(f, skb, idx, idx, num); | |
1244 | po = pkt_sk(f->arr[idx]); | |
1245 | } | |
dc99f600 DM |
1246 | |
1247 | return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev); | |
1248 | } | |
1249 | ||
fff3321d PE |
1250 | DEFINE_MUTEX(fanout_mutex); |
1251 | EXPORT_SYMBOL_GPL(fanout_mutex); | |
dc99f600 DM |
1252 | static LIST_HEAD(fanout_list); |
1253 | ||
1254 | static void __fanout_link(struct sock *sk, struct packet_sock *po) | |
1255 | { | |
1256 | struct packet_fanout *f = po->fanout; | |
1257 | ||
1258 | spin_lock(&f->lock); | |
1259 | f->arr[f->num_members] = sk; | |
1260 | smp_wmb(); | |
1261 | f->num_members++; | |
1262 | spin_unlock(&f->lock); | |
1263 | } | |
1264 | ||
1265 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po) | |
1266 | { | |
1267 | struct packet_fanout *f = po->fanout; | |
1268 | int i; | |
1269 | ||
1270 | spin_lock(&f->lock); | |
1271 | for (i = 0; i < f->num_members; i++) { | |
1272 | if (f->arr[i] == sk) | |
1273 | break; | |
1274 | } | |
1275 | BUG_ON(i >= f->num_members); | |
1276 | f->arr[i] = f->arr[f->num_members - 1]; | |
1277 | f->num_members--; | |
1278 | spin_unlock(&f->lock); | |
1279 | } | |
1280 | ||
a0dfb263 | 1281 | static bool match_fanout_group(struct packet_type *ptype, struct sock * sk) |
c0de08d0 EL |
1282 | { |
1283 | if (ptype->af_packet_priv == (void*)((struct packet_sock *)sk)->fanout) | |
1284 | return true; | |
1285 | ||
1286 | return false; | |
1287 | } | |
1288 | ||
7736d33f | 1289 | static int fanout_add(struct sock *sk, u16 id, u16 type_flags) |
dc99f600 DM |
1290 | { |
1291 | struct packet_sock *po = pkt_sk(sk); | |
1292 | struct packet_fanout *f, *match; | |
7736d33f | 1293 | u8 type = type_flags & 0xff; |
77f65ebd | 1294 | u8 flags = type_flags >> 8; |
dc99f600 DM |
1295 | int err; |
1296 | ||
1297 | switch (type) { | |
77f65ebd WB |
1298 | case PACKET_FANOUT_ROLLOVER: |
1299 | if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER) | |
1300 | return -EINVAL; | |
dc99f600 DM |
1301 | case PACKET_FANOUT_HASH: |
1302 | case PACKET_FANOUT_LB: | |
95ec3eb4 | 1303 | case PACKET_FANOUT_CPU: |
5df0ddfb | 1304 | case PACKET_FANOUT_RND: |
dc99f600 DM |
1305 | break; |
1306 | default: | |
1307 | return -EINVAL; | |
1308 | } | |
1309 | ||
1310 | if (!po->running) | |
1311 | return -EINVAL; | |
1312 | ||
1313 | if (po->fanout) | |
1314 | return -EALREADY; | |
1315 | ||
1316 | mutex_lock(&fanout_mutex); | |
1317 | match = NULL; | |
1318 | list_for_each_entry(f, &fanout_list, list) { | |
1319 | if (f->id == id && | |
1320 | read_pnet(&f->net) == sock_net(sk)) { | |
1321 | match = f; | |
1322 | break; | |
1323 | } | |
1324 | } | |
afe62c68 | 1325 | err = -EINVAL; |
77f65ebd | 1326 | if (match && match->flags != flags) |
afe62c68 | 1327 | goto out; |
dc99f600 | 1328 | if (!match) { |
afe62c68 | 1329 | err = -ENOMEM; |
dc99f600 | 1330 | match = kzalloc(sizeof(*match), GFP_KERNEL); |
afe62c68 ED |
1331 | if (!match) |
1332 | goto out; | |
1333 | write_pnet(&match->net, sock_net(sk)); | |
1334 | match->id = id; | |
1335 | match->type = type; | |
77f65ebd | 1336 | match->flags = flags; |
afe62c68 ED |
1337 | atomic_set(&match->rr_cur, 0); |
1338 | INIT_LIST_HEAD(&match->list); | |
1339 | spin_lock_init(&match->lock); | |
1340 | atomic_set(&match->sk_ref, 0); | |
1341 | match->prot_hook.type = po->prot_hook.type; | |
1342 | match->prot_hook.dev = po->prot_hook.dev; | |
1343 | match->prot_hook.func = packet_rcv_fanout; | |
1344 | match->prot_hook.af_packet_priv = match; | |
c0de08d0 | 1345 | match->prot_hook.id_match = match_fanout_group; |
afe62c68 ED |
1346 | dev_add_pack(&match->prot_hook); |
1347 | list_add(&match->list, &fanout_list); | |
dc99f600 | 1348 | } |
afe62c68 ED |
1349 | err = -EINVAL; |
1350 | if (match->type == type && | |
1351 | match->prot_hook.type == po->prot_hook.type && | |
1352 | match->prot_hook.dev == po->prot_hook.dev) { | |
1353 | err = -ENOSPC; | |
1354 | if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) { | |
1355 | __dev_remove_pack(&po->prot_hook); | |
1356 | po->fanout = match; | |
1357 | atomic_inc(&match->sk_ref); | |
1358 | __fanout_link(sk, po); | |
1359 | err = 0; | |
dc99f600 DM |
1360 | } |
1361 | } | |
afe62c68 | 1362 | out: |
dc99f600 DM |
1363 | mutex_unlock(&fanout_mutex); |
1364 | return err; | |
1365 | } | |
1366 | ||
1367 | static void fanout_release(struct sock *sk) | |
1368 | { | |
1369 | struct packet_sock *po = pkt_sk(sk); | |
1370 | struct packet_fanout *f; | |
1371 | ||
1372 | f = po->fanout; | |
1373 | if (!f) | |
1374 | return; | |
1375 | ||
fff3321d | 1376 | mutex_lock(&fanout_mutex); |
dc99f600 DM |
1377 | po->fanout = NULL; |
1378 | ||
dc99f600 DM |
1379 | if (atomic_dec_and_test(&f->sk_ref)) { |
1380 | list_del(&f->list); | |
1381 | dev_remove_pack(&f->prot_hook); | |
1382 | kfree(f); | |
1383 | } | |
1384 | mutex_unlock(&fanout_mutex); | |
1385 | } | |
1da177e4 | 1386 | |
90ddc4f0 | 1387 | static const struct proto_ops packet_ops; |
1da177e4 | 1388 | |
90ddc4f0 | 1389 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 1390 | |
40d4e3df ED |
1391 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
1392 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
1393 | { |
1394 | struct sock *sk; | |
1395 | struct sockaddr_pkt *spkt; | |
1396 | ||
1397 | /* | |
1398 | * When we registered the protocol we saved the socket in the data | |
1399 | * field for just this event. | |
1400 | */ | |
1401 | ||
1402 | sk = pt->af_packet_priv; | |
1ce4f28b | 1403 | |
1da177e4 LT |
1404 | /* |
1405 | * Yank back the headers [hope the device set this | |
1406 | * right or kerboom...] | |
1407 | * | |
1408 | * Incoming packets have ll header pulled, | |
1409 | * push it back. | |
1410 | * | |
98e399f8 | 1411 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
1412 | * so that this procedure is noop. |
1413 | */ | |
1414 | ||
1415 | if (skb->pkt_type == PACKET_LOOPBACK) | |
1416 | goto out; | |
1417 | ||
09ad9bc7 | 1418 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
1419 | goto out; |
1420 | ||
40d4e3df ED |
1421 | skb = skb_share_check(skb, GFP_ATOMIC); |
1422 | if (skb == NULL) | |
1da177e4 LT |
1423 | goto oom; |
1424 | ||
1425 | /* drop any routing info */ | |
adf30907 | 1426 | skb_dst_drop(skb); |
1da177e4 | 1427 | |
84531c24 PO |
1428 | /* drop conntrack reference */ |
1429 | nf_reset(skb); | |
1430 | ||
ffbc6111 | 1431 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 1432 | |
98e399f8 | 1433 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
1434 | |
1435 | /* | |
1436 | * The SOCK_PACKET socket receives _all_ frames. | |
1437 | */ | |
1438 | ||
1439 | spkt->spkt_family = dev->type; | |
1440 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
1441 | spkt->spkt_protocol = skb->protocol; | |
1442 | ||
1443 | /* | |
1444 | * Charge the memory to the socket. This is done specifically | |
1445 | * to prevent sockets using all the memory up. | |
1446 | */ | |
1447 | ||
40d4e3df | 1448 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
1449 | return 0; |
1450 | ||
1451 | out: | |
1452 | kfree_skb(skb); | |
1453 | oom: | |
1454 | return 0; | |
1455 | } | |
1456 | ||
1457 | ||
1458 | /* | |
1459 | * Output a raw packet to a device layer. This bypasses all the other | |
1460 | * protocol layers and you must therefore supply it with a complete frame | |
1461 | */ | |
1ce4f28b | 1462 | |
1da177e4 LT |
1463 | static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, |
1464 | struct msghdr *msg, size_t len) | |
1465 | { | |
1466 | struct sock *sk = sock->sk; | |
40d4e3df | 1467 | struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name; |
1a35ca80 | 1468 | struct sk_buff *skb = NULL; |
1da177e4 | 1469 | struct net_device *dev; |
40d4e3df | 1470 | __be16 proto = 0; |
1da177e4 | 1471 | int err; |
3bdc0eba | 1472 | int extra_len = 0; |
1ce4f28b | 1473 | |
1da177e4 | 1474 | /* |
1ce4f28b | 1475 | * Get and verify the address. |
1da177e4 LT |
1476 | */ |
1477 | ||
40d4e3df | 1478 | if (saddr) { |
1da177e4 | 1479 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
1480 | return -EINVAL; |
1481 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
1482 | proto = saddr->spkt_protocol; | |
1483 | } else | |
1484 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
1485 | |
1486 | /* | |
1ce4f28b | 1487 | * Find the device first to size check it |
1da177e4 LT |
1488 | */ |
1489 | ||
de74e92a | 1490 | saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0; |
1a35ca80 | 1491 | retry: |
654d1f8a ED |
1492 | rcu_read_lock(); |
1493 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
1494 | err = -ENODEV; |
1495 | if (dev == NULL) | |
1496 | goto out_unlock; | |
1ce4f28b | 1497 | |
d5e76b0a DM |
1498 | err = -ENETDOWN; |
1499 | if (!(dev->flags & IFF_UP)) | |
1500 | goto out_unlock; | |
1501 | ||
1da177e4 | 1502 | /* |
40d4e3df ED |
1503 | * You may not queue a frame bigger than the mtu. This is the lowest level |
1504 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 1505 | */ |
1ce4f28b | 1506 | |
3bdc0eba BG |
1507 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
1508 | if (!netif_supports_nofcs(dev)) { | |
1509 | err = -EPROTONOSUPPORT; | |
1510 | goto out_unlock; | |
1511 | } | |
1512 | extra_len = 4; /* We're doing our own CRC */ | |
1513 | } | |
1514 | ||
1da177e4 | 1515 | err = -EMSGSIZE; |
3bdc0eba | 1516 | if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len) |
1da177e4 LT |
1517 | goto out_unlock; |
1518 | ||
1a35ca80 ED |
1519 | if (!skb) { |
1520 | size_t reserved = LL_RESERVED_SPACE(dev); | |
4ce40912 | 1521 | int tlen = dev->needed_tailroom; |
1a35ca80 ED |
1522 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; |
1523 | ||
1524 | rcu_read_unlock(); | |
4ce40912 | 1525 | skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL); |
1a35ca80 ED |
1526 | if (skb == NULL) |
1527 | return -ENOBUFS; | |
1528 | /* FIXME: Save some space for broken drivers that write a hard | |
1529 | * header at transmission time by themselves. PPP is the notable | |
1530 | * one here. This should really be fixed at the driver level. | |
1531 | */ | |
1532 | skb_reserve(skb, reserved); | |
1533 | skb_reset_network_header(skb); | |
1534 | ||
1535 | /* Try to align data part correctly */ | |
1536 | if (hhlen) { | |
1537 | skb->data -= hhlen; | |
1538 | skb->tail -= hhlen; | |
1539 | if (len < hhlen) | |
1540 | skb_reset_network_header(skb); | |
1541 | } | |
1542 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
1543 | if (err) | |
1544 | goto out_free; | |
1545 | goto retry; | |
1da177e4 LT |
1546 | } |
1547 | ||
3bdc0eba | 1548 | if (len > (dev->mtu + dev->hard_header_len + extra_len)) { |
57f89bfa BG |
1549 | /* Earlier code assumed this would be a VLAN pkt, |
1550 | * double-check this now that we have the actual | |
1551 | * packet in hand. | |
1552 | */ | |
1553 | struct ethhdr *ehdr; | |
1554 | skb_reset_mac_header(skb); | |
1555 | ehdr = eth_hdr(skb); | |
1556 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { | |
1557 | err = -EMSGSIZE; | |
1558 | goto out_unlock; | |
1559 | } | |
1560 | } | |
1a35ca80 | 1561 | |
1da177e4 LT |
1562 | skb->protocol = proto; |
1563 | skb->dev = dev; | |
1564 | skb->priority = sk->sk_priority; | |
2d37a186 | 1565 | skb->mark = sk->sk_mark; |
bf84a010 DB |
1566 | |
1567 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); | |
1da177e4 | 1568 | |
3bdc0eba BG |
1569 | if (unlikely(extra_len == 4)) |
1570 | skb->no_fcs = 1; | |
1571 | ||
40893fd0 | 1572 | skb_probe_transport_header(skb, 0); |
c1aad275 | 1573 | |
1da177e4 | 1574 | dev_queue_xmit(skb); |
654d1f8a | 1575 | rcu_read_unlock(); |
40d4e3df | 1576 | return len; |
1da177e4 | 1577 | |
1da177e4 | 1578 | out_unlock: |
654d1f8a | 1579 | rcu_read_unlock(); |
1a35ca80 ED |
1580 | out_free: |
1581 | kfree_skb(skb); | |
1da177e4 LT |
1582 | return err; |
1583 | } | |
1da177e4 | 1584 | |
eea49cc9 | 1585 | static unsigned int run_filter(const struct sk_buff *skb, |
62ab0812 | 1586 | const struct sock *sk, |
dbcb5855 | 1587 | unsigned int res) |
1da177e4 LT |
1588 | { |
1589 | struct sk_filter *filter; | |
fda9ef5d | 1590 | |
80f8f102 ED |
1591 | rcu_read_lock(); |
1592 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 | 1593 | if (filter != NULL) |
0a14842f | 1594 | res = SK_RUN_FILTER(filter, skb); |
80f8f102 | 1595 | rcu_read_unlock(); |
1da177e4 | 1596 | |
dbcb5855 | 1597 | return res; |
1da177e4 LT |
1598 | } |
1599 | ||
1600 | /* | |
62ab0812 ED |
1601 | * This function makes lazy skb cloning in hope that most of packets |
1602 | * are discarded by BPF. | |
1603 | * | |
1604 | * Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
1605 | * and skb->cb are mangled. It works because (and until) packets | |
1606 | * falling here are owned by current CPU. Output packets are cloned | |
1607 | * by dev_queue_xmit_nit(), input packets are processed by net_bh | |
1608 | * sequencially, so that if we return skb to original state on exit, | |
1609 | * we will not harm anyone. | |
1da177e4 LT |
1610 | */ |
1611 | ||
40d4e3df ED |
1612 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
1613 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
1614 | { |
1615 | struct sock *sk; | |
1616 | struct sockaddr_ll *sll; | |
1617 | struct packet_sock *po; | |
40d4e3df | 1618 | u8 *skb_head = skb->data; |
1da177e4 | 1619 | int skb_len = skb->len; |
dbcb5855 | 1620 | unsigned int snaplen, res; |
1da177e4 LT |
1621 | |
1622 | if (skb->pkt_type == PACKET_LOOPBACK) | |
1623 | goto drop; | |
1624 | ||
1625 | sk = pt->af_packet_priv; | |
1626 | po = pkt_sk(sk); | |
1627 | ||
09ad9bc7 | 1628 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
1629 | goto drop; |
1630 | ||
1da177e4 LT |
1631 | skb->dev = dev; |
1632 | ||
3b04ddde | 1633 | if (dev->header_ops) { |
1da177e4 | 1634 | /* The device has an explicit notion of ll header, |
62ab0812 ED |
1635 | * exported to higher levels. |
1636 | * | |
1637 | * Otherwise, the device hides details of its frame | |
1638 | * structure, so that corresponding packet head is | |
1639 | * never delivered to user. | |
1da177e4 LT |
1640 | */ |
1641 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 1642 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
1643 | else if (skb->pkt_type == PACKET_OUTGOING) { |
1644 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 1645 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1646 | } |
1647 | } | |
1648 | ||
1649 | snaplen = skb->len; | |
1650 | ||
dbcb5855 DM |
1651 | res = run_filter(skb, sk, snaplen); |
1652 | if (!res) | |
fda9ef5d | 1653 | goto drop_n_restore; |
dbcb5855 DM |
1654 | if (snaplen > res) |
1655 | snaplen = res; | |
1da177e4 | 1656 | |
0fd7bac6 | 1657 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
1da177e4 LT |
1658 | goto drop_n_acct; |
1659 | ||
1660 | if (skb_shared(skb)) { | |
1661 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
1662 | if (nskb == NULL) | |
1663 | goto drop_n_acct; | |
1664 | ||
1665 | if (skb_head != skb->data) { | |
1666 | skb->data = skb_head; | |
1667 | skb->len = skb_len; | |
1668 | } | |
abc4e4fa | 1669 | consume_skb(skb); |
1da177e4 LT |
1670 | skb = nskb; |
1671 | } | |
1672 | ||
ffbc6111 HX |
1673 | BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
1674 | sizeof(skb->cb)); | |
1675 | ||
1676 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 LT |
1677 | sll->sll_family = AF_PACKET; |
1678 | sll->sll_hatype = dev->type; | |
1679 | sll->sll_protocol = skb->protocol; | |
1680 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 1681 | if (unlikely(po->origdev)) |
80feaacb PWJ |
1682 | sll->sll_ifindex = orig_dev->ifindex; |
1683 | else | |
1684 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 1685 | |
b95cce35 | 1686 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 1687 | |
ffbc6111 | 1688 | PACKET_SKB_CB(skb)->origlen = skb->len; |
8dc41944 | 1689 | |
1da177e4 LT |
1690 | if (pskb_trim(skb, snaplen)) |
1691 | goto drop_n_acct; | |
1692 | ||
1693 | skb_set_owner_r(skb, sk); | |
1694 | skb->dev = NULL; | |
adf30907 | 1695 | skb_dst_drop(skb); |
1da177e4 | 1696 | |
84531c24 PO |
1697 | /* drop conntrack reference */ |
1698 | nf_reset(skb); | |
1699 | ||
1da177e4 | 1700 | spin_lock(&sk->sk_receive_queue.lock); |
ee80fbf3 | 1701 | po->stats.stats1.tp_packets++; |
3b885787 | 1702 | skb->dropcount = atomic_read(&sk->sk_drops); |
1da177e4 LT |
1703 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
1704 | spin_unlock(&sk->sk_receive_queue.lock); | |
1705 | sk->sk_data_ready(sk, skb->len); | |
1706 | return 0; | |
1707 | ||
1708 | drop_n_acct: | |
7091fbd8 | 1709 | spin_lock(&sk->sk_receive_queue.lock); |
ee80fbf3 | 1710 | po->stats.stats1.tp_drops++; |
7091fbd8 WB |
1711 | atomic_inc(&sk->sk_drops); |
1712 | spin_unlock(&sk->sk_receive_queue.lock); | |
1da177e4 LT |
1713 | |
1714 | drop_n_restore: | |
1715 | if (skb_head != skb->data && skb_shared(skb)) { | |
1716 | skb->data = skb_head; | |
1717 | skb->len = skb_len; | |
1718 | } | |
1719 | drop: | |
ead2ceb0 | 1720 | consume_skb(skb); |
1da177e4 LT |
1721 | return 0; |
1722 | } | |
1723 | ||
40d4e3df ED |
1724 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
1725 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
1726 | { |
1727 | struct sock *sk; | |
1728 | struct packet_sock *po; | |
1729 | struct sockaddr_ll *sll; | |
184f489e | 1730 | union tpacket_uhdr h; |
40d4e3df | 1731 | u8 *skb_head = skb->data; |
1da177e4 | 1732 | int skb_len = skb->len; |
dbcb5855 | 1733 | unsigned int snaplen, res; |
f6fb8f10 | 1734 | unsigned long status = TP_STATUS_USER; |
bbd6ef87 | 1735 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 1736 | struct sk_buff *copy_skb = NULL; |
bbd6ef87 | 1737 | struct timespec ts; |
b9c32fb2 | 1738 | __u32 ts_status; |
1da177e4 LT |
1739 | |
1740 | if (skb->pkt_type == PACKET_LOOPBACK) | |
1741 | goto drop; | |
1742 | ||
1743 | sk = pt->af_packet_priv; | |
1744 | po = pkt_sk(sk); | |
1745 | ||
09ad9bc7 | 1746 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
1747 | goto drop; |
1748 | ||
3b04ddde | 1749 | if (dev->header_ops) { |
1da177e4 | 1750 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 1751 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
1752 | else if (skb->pkt_type == PACKET_OUTGOING) { |
1753 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 1754 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1755 | } |
1756 | } | |
1757 | ||
8dc41944 HX |
1758 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
1759 | status |= TP_STATUS_CSUMNOTREADY; | |
1760 | ||
1da177e4 LT |
1761 | snaplen = skb->len; |
1762 | ||
dbcb5855 DM |
1763 | res = run_filter(skb, sk, snaplen); |
1764 | if (!res) | |
fda9ef5d | 1765 | goto drop_n_restore; |
dbcb5855 DM |
1766 | if (snaplen > res) |
1767 | snaplen = res; | |
1da177e4 LT |
1768 | |
1769 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
1770 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
1771 | po->tp_reserve; | |
1da177e4 | 1772 | } else { |
95c96174 | 1773 | unsigned int maclen = skb_network_offset(skb); |
bbd6ef87 | 1774 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
1775 | (maclen < 16 ? 16 : maclen)) + |
1776 | po->tp_reserve; | |
1da177e4 LT |
1777 | macoff = netoff - maclen; |
1778 | } | |
f6fb8f10 | 1779 | if (po->tp_version <= TPACKET_V2) { |
1780 | if (macoff + snaplen > po->rx_ring.frame_size) { | |
1781 | if (po->copy_thresh && | |
0fd7bac6 | 1782 | atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
f6fb8f10 | 1783 | if (skb_shared(skb)) { |
1784 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
1785 | } else { | |
1786 | copy_skb = skb_get(skb); | |
1787 | skb_head = skb->data; | |
1788 | } | |
1789 | if (copy_skb) | |
1790 | skb_set_owner_r(copy_skb, sk); | |
1da177e4 | 1791 | } |
f6fb8f10 | 1792 | snaplen = po->rx_ring.frame_size - macoff; |
1793 | if ((int)snaplen < 0) | |
1794 | snaplen = 0; | |
1da177e4 | 1795 | } |
1da177e4 | 1796 | } |
1da177e4 | 1797 | spin_lock(&sk->sk_receive_queue.lock); |
f6fb8f10 | 1798 | h.raw = packet_current_rx_frame(po, skb, |
1799 | TP_STATUS_KERNEL, (macoff+snaplen)); | |
bbd6ef87 | 1800 | if (!h.raw) |
1da177e4 | 1801 | goto ring_is_full; |
f6fb8f10 | 1802 | if (po->tp_version <= TPACKET_V2) { |
1803 | packet_increment_rx_head(po, &po->rx_ring); | |
1804 | /* | |
1805 | * LOSING will be reported till you read the stats, | |
1806 | * because it's COR - Clear On Read. | |
1807 | * Anyways, moving it for V1/V2 only as V3 doesn't need this | |
1808 | * at packet level. | |
1809 | */ | |
ee80fbf3 | 1810 | if (po->stats.stats1.tp_drops) |
f6fb8f10 | 1811 | status |= TP_STATUS_LOSING; |
1812 | } | |
ee80fbf3 | 1813 | po->stats.stats1.tp_packets++; |
1da177e4 LT |
1814 | if (copy_skb) { |
1815 | status |= TP_STATUS_COPY; | |
1816 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
1817 | } | |
1da177e4 LT |
1818 | spin_unlock(&sk->sk_receive_queue.lock); |
1819 | ||
bbd6ef87 | 1820 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
b9c32fb2 DB |
1821 | |
1822 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) | |
7a51384c | 1823 | getnstimeofday(&ts); |
1da177e4 | 1824 | |
b9c32fb2 DB |
1825 | status |= ts_status; |
1826 | ||
bbd6ef87 PM |
1827 | switch (po->tp_version) { |
1828 | case TPACKET_V1: | |
1829 | h.h1->tp_len = skb->len; | |
1830 | h.h1->tp_snaplen = snaplen; | |
1831 | h.h1->tp_mac = macoff; | |
1832 | h.h1->tp_net = netoff; | |
4b457bdf DB |
1833 | h.h1->tp_sec = ts.tv_sec; |
1834 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; | |
bbd6ef87 PM |
1835 | hdrlen = sizeof(*h.h1); |
1836 | break; | |
1837 | case TPACKET_V2: | |
1838 | h.h2->tp_len = skb->len; | |
1839 | h.h2->tp_snaplen = snaplen; | |
1840 | h.h2->tp_mac = macoff; | |
1841 | h.h2->tp_net = netoff; | |
bbd6ef87 PM |
1842 | h.h2->tp_sec = ts.tv_sec; |
1843 | h.h2->tp_nsec = ts.tv_nsec; | |
a3bcc23e BG |
1844 | if (vlan_tx_tag_present(skb)) { |
1845 | h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); | |
1846 | status |= TP_STATUS_VLAN_VALID; | |
1847 | } else { | |
1848 | h.h2->tp_vlan_tci = 0; | |
1849 | } | |
13fcb7bd | 1850 | h.h2->tp_padding = 0; |
bbd6ef87 PM |
1851 | hdrlen = sizeof(*h.h2); |
1852 | break; | |
f6fb8f10 | 1853 | case TPACKET_V3: |
1854 | /* tp_nxt_offset,vlan are already populated above. | |
1855 | * So DONT clear those fields here | |
1856 | */ | |
1857 | h.h3->tp_status |= status; | |
1858 | h.h3->tp_len = skb->len; | |
1859 | h.h3->tp_snaplen = snaplen; | |
1860 | h.h3->tp_mac = macoff; | |
1861 | h.h3->tp_net = netoff; | |
f6fb8f10 | 1862 | h.h3->tp_sec = ts.tv_sec; |
1863 | h.h3->tp_nsec = ts.tv_nsec; | |
1864 | hdrlen = sizeof(*h.h3); | |
1865 | break; | |
bbd6ef87 PM |
1866 | default: |
1867 | BUG(); | |
1868 | } | |
1da177e4 | 1869 | |
bbd6ef87 | 1870 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 1871 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
1872 | sll->sll_family = AF_PACKET; |
1873 | sll->sll_hatype = dev->type; | |
1874 | sll->sll_protocol = skb->protocol; | |
1875 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 1876 | if (unlikely(po->origdev)) |
80feaacb PWJ |
1877 | sll->sll_ifindex = orig_dev->ifindex; |
1878 | else | |
1879 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 1880 | |
e16aa207 | 1881 | smp_mb(); |
f6dafa95 | 1882 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
1da177e4 | 1883 | { |
0af55bb5 CG |
1884 | u8 *start, *end; |
1885 | ||
f6fb8f10 | 1886 | if (po->tp_version <= TPACKET_V2) { |
1887 | end = (u8 *)PAGE_ALIGN((unsigned long)h.raw | |
1888 | + macoff + snaplen); | |
1889 | for (start = h.raw; start < end; start += PAGE_SIZE) | |
1890 | flush_dcache_page(pgv_to_page(start)); | |
1891 | } | |
cc9f01b2 | 1892 | smp_wmb(); |
1da177e4 | 1893 | } |
f6dafa95 | 1894 | #endif |
f6fb8f10 | 1895 | if (po->tp_version <= TPACKET_V2) |
1896 | __packet_set_status(po, h.raw, status); | |
1897 | else | |
1898 | prb_clear_blk_fill_status(&po->rx_ring); | |
1da177e4 LT |
1899 | |
1900 | sk->sk_data_ready(sk, 0); | |
1901 | ||
1902 | drop_n_restore: | |
1903 | if (skb_head != skb->data && skb_shared(skb)) { | |
1904 | skb->data = skb_head; | |
1905 | skb->len = skb_len; | |
1906 | } | |
1907 | drop: | |
1ce4f28b | 1908 | kfree_skb(skb); |
1da177e4 LT |
1909 | return 0; |
1910 | ||
1911 | ring_is_full: | |
ee80fbf3 | 1912 | po->stats.stats1.tp_drops++; |
1da177e4 LT |
1913 | spin_unlock(&sk->sk_receive_queue.lock); |
1914 | ||
1915 | sk->sk_data_ready(sk, 0); | |
acb5d75b | 1916 | kfree_skb(copy_skb); |
1da177e4 LT |
1917 | goto drop_n_restore; |
1918 | } | |
1919 | ||
69e3c75f JB |
1920 | static void tpacket_destruct_skb(struct sk_buff *skb) |
1921 | { | |
1922 | struct packet_sock *po = pkt_sk(skb->sk); | |
40d4e3df | 1923 | void *ph; |
1da177e4 | 1924 | |
69e3c75f | 1925 | if (likely(po->tx_ring.pg_vec)) { |
b9c32fb2 DB |
1926 | __u32 ts; |
1927 | ||
69e3c75f | 1928 | ph = skb_shinfo(skb)->destructor_arg; |
69e3c75f JB |
1929 | BUG_ON(atomic_read(&po->tx_ring.pending) == 0); |
1930 | atomic_dec(&po->tx_ring.pending); | |
b9c32fb2 DB |
1931 | |
1932 | ts = __packet_set_timestamp(po, ph, skb); | |
1933 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts); | |
69e3c75f JB |
1934 | } |
1935 | ||
1936 | sock_wfree(skb); | |
1937 | } | |
1938 | ||
40d4e3df ED |
1939 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
1940 | void *frame, struct net_device *dev, int size_max, | |
ae641949 | 1941 | __be16 proto, unsigned char *addr, int hlen) |
69e3c75f | 1942 | { |
184f489e | 1943 | union tpacket_uhdr ph; |
09effa67 | 1944 | int to_write, offset, len, tp_len, nr_frags, len_max; |
69e3c75f JB |
1945 | struct socket *sock = po->sk.sk_socket; |
1946 | struct page *page; | |
1947 | void *data; | |
1948 | int err; | |
1949 | ||
1950 | ph.raw = frame; | |
1951 | ||
1952 | skb->protocol = proto; | |
1953 | skb->dev = dev; | |
1954 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 1955 | skb->mark = po->sk.sk_mark; |
2e31396f | 1956 | sock_tx_timestamp(&po->sk, &skb_shinfo(skb)->tx_flags); |
69e3c75f JB |
1957 | skb_shinfo(skb)->destructor_arg = ph.raw; |
1958 | ||
1959 | switch (po->tp_version) { | |
1960 | case TPACKET_V2: | |
1961 | tp_len = ph.h2->tp_len; | |
1962 | break; | |
1963 | default: | |
1964 | tp_len = ph.h1->tp_len; | |
1965 | break; | |
1966 | } | |
09effa67 DM |
1967 | if (unlikely(tp_len > size_max)) { |
1968 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); | |
1969 | return -EMSGSIZE; | |
1970 | } | |
69e3c75f | 1971 | |
ae641949 | 1972 | skb_reserve(skb, hlen); |
69e3c75f | 1973 | skb_reset_network_header(skb); |
40893fd0 | 1974 | skb_probe_transport_header(skb, 0); |
c1aad275 | 1975 | |
5920cd3a PC |
1976 | if (po->tp_tx_has_off) { |
1977 | int off_min, off_max, off; | |
1978 | off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
1979 | off_max = po->tx_ring.frame_size - tp_len; | |
1980 | if (sock->type == SOCK_DGRAM) { | |
1981 | switch (po->tp_version) { | |
1982 | case TPACKET_V2: | |
1983 | off = ph.h2->tp_net; | |
1984 | break; | |
1985 | default: | |
1986 | off = ph.h1->tp_net; | |
1987 | break; | |
1988 | } | |
1989 | } else { | |
1990 | switch (po->tp_version) { | |
1991 | case TPACKET_V2: | |
1992 | off = ph.h2->tp_mac; | |
1993 | break; | |
1994 | default: | |
1995 | off = ph.h1->tp_mac; | |
1996 | break; | |
1997 | } | |
1998 | } | |
1999 | if (unlikely((off < off_min) || (off_max < off))) | |
2000 | return -EINVAL; | |
2001 | data = ph.raw + off; | |
2002 | } else { | |
2003 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
2004 | } | |
69e3c75f JB |
2005 | to_write = tp_len; |
2006 | ||
2007 | if (sock->type == SOCK_DGRAM) { | |
2008 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
2009 | NULL, tp_len); | |
2010 | if (unlikely(err < 0)) | |
2011 | return -EINVAL; | |
40d4e3df | 2012 | } else if (dev->hard_header_len) { |
69e3c75f JB |
2013 | /* net device doesn't like empty head */ |
2014 | if (unlikely(tp_len <= dev->hard_header_len)) { | |
40d4e3df ED |
2015 | pr_err("packet size is too short (%d < %d)\n", |
2016 | tp_len, dev->hard_header_len); | |
69e3c75f JB |
2017 | return -EINVAL; |
2018 | } | |
2019 | ||
2020 | skb_push(skb, dev->hard_header_len); | |
2021 | err = skb_store_bits(skb, 0, data, | |
2022 | dev->hard_header_len); | |
2023 | if (unlikely(err)) | |
2024 | return err; | |
2025 | ||
2026 | data += dev->hard_header_len; | |
2027 | to_write -= dev->hard_header_len; | |
2028 | } | |
2029 | ||
69e3c75f JB |
2030 | offset = offset_in_page(data); |
2031 | len_max = PAGE_SIZE - offset; | |
2032 | len = ((to_write > len_max) ? len_max : to_write); | |
2033 | ||
2034 | skb->data_len = to_write; | |
2035 | skb->len += to_write; | |
2036 | skb->truesize += to_write; | |
2037 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
2038 | ||
2039 | while (likely(to_write)) { | |
2040 | nr_frags = skb_shinfo(skb)->nr_frags; | |
2041 | ||
2042 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
2043 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
2044 | MAX_SKB_FRAGS); | |
69e3c75f JB |
2045 | return -EFAULT; |
2046 | } | |
2047 | ||
0af55bb5 CG |
2048 | page = pgv_to_page(data); |
2049 | data += len; | |
69e3c75f JB |
2050 | flush_dcache_page(page); |
2051 | get_page(page); | |
0af55bb5 | 2052 | skb_fill_page_desc(skb, nr_frags, page, offset, len); |
69e3c75f JB |
2053 | to_write -= len; |
2054 | offset = 0; | |
2055 | len_max = PAGE_SIZE; | |
2056 | len = ((to_write > len_max) ? len_max : to_write); | |
2057 | } | |
2058 | ||
2059 | return tp_len; | |
2060 | } | |
2061 | ||
e40526cb DB |
2062 | static struct net_device *packet_cached_dev_get(struct packet_sock *po) |
2063 | { | |
2064 | struct net_device *dev; | |
2065 | ||
2066 | rcu_read_lock(); | |
2067 | dev = rcu_dereference(po->cached_dev); | |
2068 | if (dev) | |
2069 | dev_hold(dev); | |
2070 | rcu_read_unlock(); | |
2071 | ||
2072 | return dev; | |
2073 | } | |
2074 | ||
69e3c75f JB |
2075 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) |
2076 | { | |
69e3c75f JB |
2077 | struct sk_buff *skb; |
2078 | struct net_device *dev; | |
2079 | __be16 proto; | |
09effa67 | 2080 | int err, reserve = 0; |
40d4e3df ED |
2081 | void *ph; |
2082 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; | |
69e3c75f JB |
2083 | int tp_len, size_max; |
2084 | unsigned char *addr; | |
2085 | int len_sum = 0; | |
9e67030a | 2086 | int status = TP_STATUS_AVAILABLE; |
ae641949 | 2087 | int hlen, tlen; |
69e3c75f | 2088 | |
69e3c75f JB |
2089 | mutex_lock(&po->pg_vec_lock); |
2090 | ||
69e3c75f | 2091 | if (saddr == NULL) { |
e40526cb | 2092 | dev = packet_cached_dev_get(po); |
69e3c75f JB |
2093 | proto = po->num; |
2094 | addr = NULL; | |
2095 | } else { | |
2096 | err = -EINVAL; | |
2097 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
2098 | goto out; | |
2099 | if (msg->msg_namelen < (saddr->sll_halen | |
2100 | + offsetof(struct sockaddr_ll, | |
2101 | sll_addr))) | |
2102 | goto out; | |
69e3c75f JB |
2103 | proto = saddr->sll_protocol; |
2104 | addr = saddr->sll_addr; | |
827d9780 | 2105 | dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
69e3c75f JB |
2106 | } |
2107 | ||
69e3c75f JB |
2108 | err = -ENXIO; |
2109 | if (unlikely(dev == NULL)) | |
2110 | goto out; | |
69e3c75f JB |
2111 | err = -ENETDOWN; |
2112 | if (unlikely(!(dev->flags & IFF_UP))) | |
2113 | goto out_put; | |
2114 | ||
e40526cb DB |
2115 | reserve = dev->hard_header_len; |
2116 | ||
69e3c75f | 2117 | size_max = po->tx_ring.frame_size |
b5dd884e | 2118 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f | 2119 | |
09effa67 DM |
2120 | if (size_max > dev->mtu + reserve) |
2121 | size_max = dev->mtu + reserve; | |
2122 | ||
69e3c75f JB |
2123 | do { |
2124 | ph = packet_current_frame(po, &po->tx_ring, | |
2125 | TP_STATUS_SEND_REQUEST); | |
2126 | ||
2127 | if (unlikely(ph == NULL)) { | |
2128 | schedule(); | |
2129 | continue; | |
2130 | } | |
2131 | ||
2132 | status = TP_STATUS_SEND_REQUEST; | |
ae641949 HX |
2133 | hlen = LL_RESERVED_SPACE(dev); |
2134 | tlen = dev->needed_tailroom; | |
69e3c75f | 2135 | skb = sock_alloc_send_skb(&po->sk, |
ae641949 | 2136 | hlen + tlen + sizeof(struct sockaddr_ll), |
69e3c75f JB |
2137 | 0, &err); |
2138 | ||
2139 | if (unlikely(skb == NULL)) | |
2140 | goto out_status; | |
2141 | ||
2142 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, | |
ae641949 | 2143 | addr, hlen); |
69e3c75f JB |
2144 | |
2145 | if (unlikely(tp_len < 0)) { | |
2146 | if (po->tp_loss) { | |
2147 | __packet_set_status(po, ph, | |
2148 | TP_STATUS_AVAILABLE); | |
2149 | packet_increment_head(&po->tx_ring); | |
2150 | kfree_skb(skb); | |
2151 | continue; | |
2152 | } else { | |
2153 | status = TP_STATUS_WRONG_FORMAT; | |
2154 | err = tp_len; | |
2155 | goto out_status; | |
2156 | } | |
2157 | } | |
2158 | ||
2159 | skb->destructor = tpacket_destruct_skb; | |
2160 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
2161 | atomic_inc(&po->tx_ring.pending); | |
2162 | ||
2163 | status = TP_STATUS_SEND_REQUEST; | |
2164 | err = dev_queue_xmit(skb); | |
eb70df13 JP |
2165 | if (unlikely(err > 0)) { |
2166 | err = net_xmit_errno(err); | |
2167 | if (err && __packet_get_status(po, ph) == | |
2168 | TP_STATUS_AVAILABLE) { | |
2169 | /* skb was destructed already */ | |
2170 | skb = NULL; | |
2171 | goto out_status; | |
2172 | } | |
2173 | /* | |
2174 | * skb was dropped but not destructed yet; | |
2175 | * let's treat it like congestion or err < 0 | |
2176 | */ | |
2177 | err = 0; | |
2178 | } | |
69e3c75f JB |
2179 | packet_increment_head(&po->tx_ring); |
2180 | len_sum += tp_len; | |
f64f9e71 JP |
2181 | } while (likely((ph != NULL) || |
2182 | ((!(msg->msg_flags & MSG_DONTWAIT)) && | |
2183 | (atomic_read(&po->tx_ring.pending)))) | |
2184 | ); | |
69e3c75f JB |
2185 | |
2186 | err = len_sum; | |
2187 | goto out_put; | |
2188 | ||
69e3c75f JB |
2189 | out_status: |
2190 | __packet_set_status(po, ph, status); | |
2191 | kfree_skb(skb); | |
2192 | out_put: | |
e40526cb | 2193 | dev_put(dev); |
69e3c75f JB |
2194 | out: |
2195 | mutex_unlock(&po->pg_vec_lock); | |
2196 | return err; | |
2197 | } | |
69e3c75f | 2198 | |
eea49cc9 OJ |
2199 | static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
2200 | size_t reserve, size_t len, | |
2201 | size_t linear, int noblock, | |
2202 | int *err) | |
bfd5f4a3 SS |
2203 | { |
2204 | struct sk_buff *skb; | |
2205 | ||
2206 | /* Under a page? Don't bother with paged skb. */ | |
2207 | if (prepad + len < PAGE_SIZE || !linear) | |
2208 | linear = len; | |
2209 | ||
2210 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
28d64271 | 2211 | err, 0); |
bfd5f4a3 SS |
2212 | if (!skb) |
2213 | return NULL; | |
2214 | ||
2215 | skb_reserve(skb, reserve); | |
2216 | skb_put(skb, linear); | |
2217 | skb->data_len = len - linear; | |
2218 | skb->len += len - linear; | |
2219 | ||
2220 | return skb; | |
2221 | } | |
2222 | ||
69e3c75f | 2223 | static int packet_snd(struct socket *sock, |
1da177e4 LT |
2224 | struct msghdr *msg, size_t len) |
2225 | { | |
2226 | struct sock *sk = sock->sk; | |
40d4e3df | 2227 | struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
1da177e4 LT |
2228 | struct sk_buff *skb; |
2229 | struct net_device *dev; | |
0e11c91e | 2230 | __be16 proto; |
1da177e4 | 2231 | unsigned char *addr; |
827d9780 | 2232 | int err, reserve = 0; |
bfd5f4a3 SS |
2233 | struct virtio_net_hdr vnet_hdr = { 0 }; |
2234 | int offset = 0; | |
2235 | int vnet_hdr_len; | |
2236 | struct packet_sock *po = pkt_sk(sk); | |
2237 | unsigned short gso_type = 0; | |
ae641949 | 2238 | int hlen, tlen; |
3bdc0eba | 2239 | int extra_len = 0; |
1da177e4 LT |
2240 | |
2241 | /* | |
1ce4f28b | 2242 | * Get and verify the address. |
1da177e4 | 2243 | */ |
1ce4f28b | 2244 | |
1da177e4 | 2245 | if (saddr == NULL) { |
e40526cb | 2246 | dev = packet_cached_dev_get(po); |
1da177e4 LT |
2247 | proto = po->num; |
2248 | addr = NULL; | |
2249 | } else { | |
2250 | err = -EINVAL; | |
2251 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
2252 | goto out; | |
0fb375fb EB |
2253 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
2254 | goto out; | |
1da177e4 LT |
2255 | proto = saddr->sll_protocol; |
2256 | addr = saddr->sll_addr; | |
827d9780 | 2257 | dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
1da177e4 LT |
2258 | } |
2259 | ||
1da177e4 | 2260 | err = -ENXIO; |
e40526cb | 2261 | if (unlikely(dev == NULL)) |
1da177e4 | 2262 | goto out_unlock; |
d5e76b0a | 2263 | err = -ENETDOWN; |
e40526cb | 2264 | if (unlikely(!(dev->flags & IFF_UP))) |
d5e76b0a DM |
2265 | goto out_unlock; |
2266 | ||
e40526cb DB |
2267 | if (sock->type == SOCK_RAW) |
2268 | reserve = dev->hard_header_len; | |
bfd5f4a3 SS |
2269 | if (po->has_vnet_hdr) { |
2270 | vnet_hdr_len = sizeof(vnet_hdr); | |
2271 | ||
2272 | err = -EINVAL; | |
2273 | if (len < vnet_hdr_len) | |
2274 | goto out_unlock; | |
2275 | ||
2276 | len -= vnet_hdr_len; | |
2277 | ||
2278 | err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, | |
2279 | vnet_hdr_len); | |
2280 | if (err < 0) | |
2281 | goto out_unlock; | |
2282 | ||
2283 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
2284 | (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
2285 | vnet_hdr.hdr_len)) | |
2286 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
2287 | vnet_hdr.csum_offset + 2; | |
2288 | ||
2289 | err = -EINVAL; | |
2290 | if (vnet_hdr.hdr_len > len) | |
2291 | goto out_unlock; | |
2292 | ||
2293 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
2294 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
2295 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
2296 | gso_type = SKB_GSO_TCPV4; | |
2297 | break; | |
2298 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
2299 | gso_type = SKB_GSO_TCPV6; | |
2300 | break; | |
2301 | case VIRTIO_NET_HDR_GSO_UDP: | |
2302 | gso_type = SKB_GSO_UDP; | |
2303 | break; | |
2304 | default: | |
2305 | goto out_unlock; | |
2306 | } | |
2307 | ||
2308 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
2309 | gso_type |= SKB_GSO_TCP_ECN; | |
2310 | ||
2311 | if (vnet_hdr.gso_size == 0) | |
2312 | goto out_unlock; | |
2313 | ||
2314 | } | |
2315 | } | |
2316 | ||
3bdc0eba BG |
2317 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
2318 | if (!netif_supports_nofcs(dev)) { | |
2319 | err = -EPROTONOSUPPORT; | |
2320 | goto out_unlock; | |
2321 | } | |
2322 | extra_len = 4; /* We're doing our own CRC */ | |
2323 | } | |
2324 | ||
1da177e4 | 2325 | err = -EMSGSIZE; |
3bdc0eba | 2326 | if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN + extra_len)) |
1da177e4 LT |
2327 | goto out_unlock; |
2328 | ||
bfd5f4a3 | 2329 | err = -ENOBUFS; |
ae641949 HX |
2330 | hlen = LL_RESERVED_SPACE(dev); |
2331 | tlen = dev->needed_tailroom; | |
2332 | skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, vnet_hdr.hdr_len, | |
bfd5f4a3 | 2333 | msg->msg_flags & MSG_DONTWAIT, &err); |
40d4e3df | 2334 | if (skb == NULL) |
1da177e4 LT |
2335 | goto out_unlock; |
2336 | ||
bfd5f4a3 | 2337 | skb_set_network_header(skb, reserve); |
1da177e4 | 2338 | |
0c4e8581 SH |
2339 | err = -EINVAL; |
2340 | if (sock->type == SOCK_DGRAM && | |
bfd5f4a3 | 2341 | (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
0c4e8581 | 2342 | goto out_free; |
1da177e4 LT |
2343 | |
2344 | /* Returns -EFAULT on error */ | |
bfd5f4a3 | 2345 | err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
1da177e4 LT |
2346 | if (err) |
2347 | goto out_free; | |
bf84a010 DB |
2348 | |
2349 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); | |
1da177e4 | 2350 | |
3bdc0eba | 2351 | if (!gso_type && (len > dev->mtu + reserve + extra_len)) { |
09effa67 DM |
2352 | /* Earlier code assumed this would be a VLAN pkt, |
2353 | * double-check this now that we have the actual | |
2354 | * packet in hand. | |
2355 | */ | |
2356 | struct ethhdr *ehdr; | |
2357 | skb_reset_mac_header(skb); | |
2358 | ehdr = eth_hdr(skb); | |
2359 | if (ehdr->h_proto != htons(ETH_P_8021Q)) { | |
2360 | err = -EMSGSIZE; | |
2361 | goto out_free; | |
2362 | } | |
57f89bfa BG |
2363 | } |
2364 | ||
09effa67 DM |
2365 | skb->protocol = proto; |
2366 | skb->dev = dev; | |
1da177e4 | 2367 | skb->priority = sk->sk_priority; |
2d37a186 | 2368 | skb->mark = sk->sk_mark; |
1da177e4 | 2369 | |
bfd5f4a3 SS |
2370 | if (po->has_vnet_hdr) { |
2371 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
2372 | if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, | |
2373 | vnet_hdr.csum_offset)) { | |
2374 | err = -EINVAL; | |
2375 | goto out_free; | |
2376 | } | |
2377 | } | |
2378 | ||
2379 | skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; | |
2380 | skb_shinfo(skb)->gso_type = gso_type; | |
2381 | ||
2382 | /* Header must be checked, and gso_segs computed. */ | |
2383 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2384 | skb_shinfo(skb)->gso_segs = 0; | |
2385 | ||
2386 | len += vnet_hdr_len; | |
2387 | } | |
2388 | ||
40893fd0 | 2389 | skb_probe_transport_header(skb, reserve); |
c1aad275 | 2390 | |
3bdc0eba BG |
2391 | if (unlikely(extra_len == 4)) |
2392 | skb->no_fcs = 1; | |
2393 | ||
1da177e4 LT |
2394 | /* |
2395 | * Now send it | |
2396 | */ | |
2397 | ||
2398 | err = dev_queue_xmit(skb); | |
2399 | if (err > 0 && (err = net_xmit_errno(err)) != 0) | |
2400 | goto out_unlock; | |
2401 | ||
e40526cb | 2402 | dev_put(dev); |
1da177e4 | 2403 | |
40d4e3df | 2404 | return len; |
1da177e4 LT |
2405 | |
2406 | out_free: | |
2407 | kfree_skb(skb); | |
2408 | out_unlock: | |
e40526cb | 2409 | if (dev) |
1da177e4 LT |
2410 | dev_put(dev); |
2411 | out: | |
2412 | return err; | |
2413 | } | |
2414 | ||
69e3c75f JB |
2415 | static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
2416 | struct msghdr *msg, size_t len) | |
2417 | { | |
69e3c75f JB |
2418 | struct sock *sk = sock->sk; |
2419 | struct packet_sock *po = pkt_sk(sk); | |
2420 | if (po->tx_ring.pg_vec) | |
2421 | return tpacket_snd(po, msg); | |
2422 | else | |
69e3c75f JB |
2423 | return packet_snd(sock, msg, len); |
2424 | } | |
2425 | ||
1da177e4 LT |
2426 | /* |
2427 | * Close a PACKET socket. This is fairly simple. We immediately go | |
2428 | * to 'closed' state and remove our protocol entry in the device list. | |
2429 | */ | |
2430 | ||
2431 | static int packet_release(struct socket *sock) | |
2432 | { | |
2433 | struct sock *sk = sock->sk; | |
2434 | struct packet_sock *po; | |
d12d01d6 | 2435 | struct net *net; |
f6fb8f10 | 2436 | union tpacket_req_u req_u; |
1da177e4 LT |
2437 | |
2438 | if (!sk) | |
2439 | return 0; | |
2440 | ||
3b1e0a65 | 2441 | net = sock_net(sk); |
1da177e4 LT |
2442 | po = pkt_sk(sk); |
2443 | ||
0fa7fa98 | 2444 | mutex_lock(&net->packet.sklist_lock); |
808f5114 | 2445 | sk_del_node_init_rcu(sk); |
0fa7fa98 PE |
2446 | mutex_unlock(&net->packet.sklist_lock); |
2447 | ||
2448 | preempt_disable(); | |
920de804 | 2449 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
0fa7fa98 | 2450 | preempt_enable(); |
1da177e4 | 2451 | |
808f5114 | 2452 | spin_lock(&po->bind_lock); |
ce06b03e | 2453 | unregister_prot_hook(sk, false); |
160ff18a BG |
2454 | if (po->prot_hook.dev) { |
2455 | dev_put(po->prot_hook.dev); | |
2456 | po->prot_hook.dev = NULL; | |
2457 | } | |
808f5114 | 2458 | spin_unlock(&po->bind_lock); |
1da177e4 | 2459 | |
1da177e4 | 2460 | packet_flush_mclist(sk); |
1da177e4 | 2461 | |
9665d5d6 PS |
2462 | if (po->rx_ring.pg_vec) { |
2463 | memset(&req_u, 0, sizeof(req_u)); | |
f6fb8f10 | 2464 | packet_set_ring(sk, &req_u, 1, 0); |
9665d5d6 | 2465 | } |
69e3c75f | 2466 | |
9665d5d6 PS |
2467 | if (po->tx_ring.pg_vec) { |
2468 | memset(&req_u, 0, sizeof(req_u)); | |
f6fb8f10 | 2469 | packet_set_ring(sk, &req_u, 1, 1); |
9665d5d6 | 2470 | } |
1da177e4 | 2471 | |
dc99f600 DM |
2472 | fanout_release(sk); |
2473 | ||
808f5114 | 2474 | synchronize_net(); |
1da177e4 LT |
2475 | /* |
2476 | * Now the socket is dead. No more input will appear. | |
2477 | */ | |
1da177e4 LT |
2478 | sock_orphan(sk); |
2479 | sock->sk = NULL; | |
2480 | ||
2481 | /* Purge queues */ | |
2482 | ||
2483 | skb_queue_purge(&sk->sk_receive_queue); | |
17ab56a2 | 2484 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
2485 | |
2486 | sock_put(sk); | |
2487 | return 0; | |
2488 | } | |
2489 | ||
2490 | /* | |
2491 | * Attach a packet hook. | |
2492 | */ | |
2493 | ||
0e11c91e | 2494 | static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol) |
1da177e4 LT |
2495 | { |
2496 | struct packet_sock *po = pkt_sk(sk); | |
dc99f600 | 2497 | |
aef950b4 WY |
2498 | if (po->fanout) { |
2499 | if (dev) | |
2500 | dev_put(dev); | |
2501 | ||
dc99f600 | 2502 | return -EINVAL; |
aef950b4 | 2503 | } |
1da177e4 LT |
2504 | |
2505 | lock_sock(sk); | |
2506 | ||
2507 | spin_lock(&po->bind_lock); | |
ce06b03e | 2508 | unregister_prot_hook(sk, true); |
1da177e4 LT |
2509 | po->num = protocol; |
2510 | po->prot_hook.type = protocol; | |
160ff18a BG |
2511 | if (po->prot_hook.dev) |
2512 | dev_put(po->prot_hook.dev); | |
1da177e4 LT |
2513 | po->prot_hook.dev = dev; |
2514 | ||
2515 | po->ifindex = dev ? dev->ifindex : 0; | |
2516 | ||
2517 | if (protocol == 0) | |
2518 | goto out_unlock; | |
2519 | ||
be85d4ad | 2520 | if (!dev || (dev->flags & IFF_UP)) { |
ce06b03e | 2521 | register_prot_hook(sk); |
be85d4ad UT |
2522 | } else { |
2523 | sk->sk_err = ENETDOWN; | |
2524 | if (!sock_flag(sk, SOCK_DEAD)) | |
2525 | sk->sk_error_report(sk); | |
1da177e4 LT |
2526 | } |
2527 | ||
2528 | out_unlock: | |
2529 | spin_unlock(&po->bind_lock); | |
2530 | release_sock(sk); | |
2531 | return 0; | |
2532 | } | |
2533 | ||
2534 | /* | |
2535 | * Bind a packet socket to a device | |
2536 | */ | |
2537 | ||
40d4e3df ED |
2538 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
2539 | int addr_len) | |
1da177e4 | 2540 | { |
40d4e3df | 2541 | struct sock *sk = sock->sk; |
1da177e4 LT |
2542 | char name[15]; |
2543 | struct net_device *dev; | |
2544 | int err = -ENODEV; | |
1ce4f28b | 2545 | |
1da177e4 LT |
2546 | /* |
2547 | * Check legality | |
2548 | */ | |
1ce4f28b | 2549 | |
8ae55f04 | 2550 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 2551 | return -EINVAL; |
40d4e3df | 2552 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 2553 | |
3b1e0a65 | 2554 | dev = dev_get_by_name(sock_net(sk), name); |
160ff18a | 2555 | if (dev) |
1da177e4 | 2556 | err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
1da177e4 LT |
2557 | return err; |
2558 | } | |
1da177e4 LT |
2559 | |
2560 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
2561 | { | |
40d4e3df ED |
2562 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
2563 | struct sock *sk = sock->sk; | |
1da177e4 LT |
2564 | struct net_device *dev = NULL; |
2565 | int err; | |
2566 | ||
2567 | ||
2568 | /* | |
2569 | * Check legality | |
2570 | */ | |
1ce4f28b | 2571 | |
1da177e4 LT |
2572 | if (addr_len < sizeof(struct sockaddr_ll)) |
2573 | return -EINVAL; | |
2574 | if (sll->sll_family != AF_PACKET) | |
2575 | return -EINVAL; | |
2576 | ||
2577 | if (sll->sll_ifindex) { | |
2578 | err = -ENODEV; | |
3b1e0a65 | 2579 | dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex); |
1da177e4 LT |
2580 | if (dev == NULL) |
2581 | goto out; | |
2582 | } | |
2583 | err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); | |
1da177e4 LT |
2584 | |
2585 | out: | |
2586 | return err; | |
2587 | } | |
2588 | ||
2589 | static struct proto packet_proto = { | |
2590 | .name = "PACKET", | |
2591 | .owner = THIS_MODULE, | |
2592 | .obj_size = sizeof(struct packet_sock), | |
2593 | }; | |
2594 | ||
2595 | /* | |
1ce4f28b | 2596 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
2597 | */ |
2598 | ||
3f378b68 EP |
2599 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
2600 | int kern) | |
1da177e4 LT |
2601 | { |
2602 | struct sock *sk; | |
2603 | struct packet_sock *po; | |
0e11c91e | 2604 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
2605 | int err; |
2606 | ||
df008c91 | 2607 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
1da177e4 | 2608 | return -EPERM; |
be02097c DM |
2609 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
2610 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
2611 | return -ESOCKTNOSUPPORT; |
2612 | ||
2613 | sock->state = SS_UNCONNECTED; | |
2614 | ||
2615 | err = -ENOBUFS; | |
6257ff21 | 2616 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
1da177e4 LT |
2617 | if (sk == NULL) |
2618 | goto out; | |
2619 | ||
2620 | sock->ops = &packet_ops; | |
1da177e4 LT |
2621 | if (sock->type == SOCK_PACKET) |
2622 | sock->ops = &packet_ops_spkt; | |
be02097c | 2623 | |
1da177e4 LT |
2624 | sock_init_data(sock, sk); |
2625 | ||
2626 | po = pkt_sk(sk); | |
2627 | sk->sk_family = PF_PACKET; | |
0e11c91e | 2628 | po->num = proto; |
e40526cb | 2629 | RCU_INIT_POINTER(po->cached_dev, NULL); |
1da177e4 LT |
2630 | |
2631 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 2632 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
2633 | |
2634 | /* | |
2635 | * Attach a protocol block | |
2636 | */ | |
2637 | ||
2638 | spin_lock_init(&po->bind_lock); | |
905db440 | 2639 | mutex_init(&po->pg_vec_lock); |
1da177e4 | 2640 | po->prot_hook.func = packet_rcv; |
be02097c | 2641 | |
1da177e4 LT |
2642 | if (sock->type == SOCK_PACKET) |
2643 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 2644 | |
1da177e4 LT |
2645 | po->prot_hook.af_packet_priv = sk; |
2646 | ||
0e11c91e AV |
2647 | if (proto) { |
2648 | po->prot_hook.type = proto; | |
ce06b03e | 2649 | register_prot_hook(sk); |
1da177e4 LT |
2650 | } |
2651 | ||
0fa7fa98 | 2652 | mutex_lock(&net->packet.sklist_lock); |
808f5114 | 2653 | sk_add_node_rcu(sk, &net->packet.sklist); |
0fa7fa98 PE |
2654 | mutex_unlock(&net->packet.sklist_lock); |
2655 | ||
2656 | preempt_disable(); | |
3680453c | 2657 | sock_prot_inuse_add(net, &packet_proto, 1); |
0fa7fa98 | 2658 | preempt_enable(); |
808f5114 | 2659 | |
40d4e3df | 2660 | return 0; |
1da177e4 LT |
2661 | out: |
2662 | return err; | |
2663 | } | |
2664 | ||
2665 | /* | |
2666 | * Pull a packet from our receive queue and hand it to the user. | |
2667 | * If necessary we block. | |
2668 | */ | |
2669 | ||
2670 | static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
2671 | struct msghdr *msg, size_t len, int flags) | |
2672 | { | |
2673 | struct sock *sk = sock->sk; | |
2674 | struct sk_buff *skb; | |
2675 | int copied, err; | |
bfd5f4a3 | 2676 | int vnet_hdr_len = 0; |
1da177e4 LT |
2677 | |
2678 | err = -EINVAL; | |
ed85b565 | 2679 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
1da177e4 LT |
2680 | goto out; |
2681 | ||
2682 | #if 0 | |
2683 | /* What error should we return now? EUNATTACH? */ | |
2684 | if (pkt_sk(sk)->ifindex < 0) | |
2685 | return -ENODEV; | |
2686 | #endif | |
2687 | ||
ed85b565 | 2688 | if (flags & MSG_ERRQUEUE) { |
cb820f8e RC |
2689 | err = sock_recv_errqueue(sk, msg, len, |
2690 | SOL_PACKET, PACKET_TX_TIMESTAMP); | |
ed85b565 RC |
2691 | goto out; |
2692 | } | |
2693 | ||
1da177e4 LT |
2694 | /* |
2695 | * Call the generic datagram receiver. This handles all sorts | |
2696 | * of horrible races and re-entrancy so we can forget about it | |
2697 | * in the protocol layers. | |
2698 | * | |
2699 | * Now it will return ENETDOWN, if device have just gone down, | |
2700 | * but then it will block. | |
2701 | */ | |
2702 | ||
40d4e3df | 2703 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
2704 | |
2705 | /* | |
1ce4f28b | 2706 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
2707 | * handles the blocking we don't see and worry about blocking |
2708 | * retries. | |
2709 | */ | |
2710 | ||
8ae55f04 | 2711 | if (skb == NULL) |
1da177e4 LT |
2712 | goto out; |
2713 | ||
bfd5f4a3 SS |
2714 | if (pkt_sk(sk)->has_vnet_hdr) { |
2715 | struct virtio_net_hdr vnet_hdr = { 0 }; | |
2716 | ||
2717 | err = -EINVAL; | |
2718 | vnet_hdr_len = sizeof(vnet_hdr); | |
1f18b717 | 2719 | if (len < vnet_hdr_len) |
bfd5f4a3 SS |
2720 | goto out_free; |
2721 | ||
1f18b717 MK |
2722 | len -= vnet_hdr_len; |
2723 | ||
bfd5f4a3 SS |
2724 | if (skb_is_gso(skb)) { |
2725 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
2726 | ||
2727 | /* This is a hint as to how much should be linear. */ | |
2728 | vnet_hdr.hdr_len = skb_headlen(skb); | |
2729 | vnet_hdr.gso_size = sinfo->gso_size; | |
2730 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
2731 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
2732 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
2733 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
2734 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
2735 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
2736 | else if (sinfo->gso_type & SKB_GSO_FCOE) | |
2737 | goto out_free; | |
2738 | else | |
2739 | BUG(); | |
2740 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
2741 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
2742 | } else | |
2743 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
2744 | ||
2745 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
2746 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 2747 | vnet_hdr.csum_start = skb_checksum_start_offset(skb); |
bfd5f4a3 | 2748 | vnet_hdr.csum_offset = skb->csum_offset; |
10a8d94a JW |
2749 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
2750 | vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
bfd5f4a3 SS |
2751 | } /* else everything is zero */ |
2752 | ||
2753 | err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, | |
2754 | vnet_hdr_len); | |
2755 | if (err < 0) | |
2756 | goto out_free; | |
2757 | } | |
2758 | ||
f3d33426 HFS |
2759 | /* You lose any data beyond the buffer you gave. If it worries |
2760 | * a user program they can ask the device for its MTU | |
2761 | * anyway. | |
1da177e4 | 2762 | */ |
1da177e4 | 2763 | copied = skb->len; |
40d4e3df ED |
2764 | if (copied > len) { |
2765 | copied = len; | |
2766 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
2767 | } |
2768 | ||
2769 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
2770 | if (err) | |
2771 | goto out_free; | |
2772 | ||
3b885787 | 2773 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 | 2774 | |
f3d33426 HFS |
2775 | if (msg->msg_name) { |
2776 | /* If the address length field is there to be filled | |
2777 | * in, we fill it in now. | |
2778 | */ | |
2779 | if (sock->type == SOCK_PACKET) { | |
2780 | msg->msg_namelen = sizeof(struct sockaddr_pkt); | |
2781 | } else { | |
2782 | struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; | |
2783 | msg->msg_namelen = sll->sll_halen + | |
2784 | offsetof(struct sockaddr_ll, sll_addr); | |
2785 | } | |
ffbc6111 HX |
2786 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
2787 | msg->msg_namelen); | |
f3d33426 | 2788 | } |
1da177e4 | 2789 | |
8dc41944 | 2790 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
2791 | struct tpacket_auxdata aux; |
2792 | ||
2793 | aux.tp_status = TP_STATUS_USER; | |
2794 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
2795 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
2796 | aux.tp_len = PACKET_SKB_CB(skb)->origlen; | |
2797 | aux.tp_snaplen = skb->len; | |
2798 | aux.tp_mac = 0; | |
bbe735e4 | 2799 | aux.tp_net = skb_network_offset(skb); |
a3bcc23e BG |
2800 | if (vlan_tx_tag_present(skb)) { |
2801 | aux.tp_vlan_tci = vlan_tx_tag_get(skb); | |
2802 | aux.tp_status |= TP_STATUS_VLAN_VALID; | |
2803 | } else { | |
2804 | aux.tp_vlan_tci = 0; | |
2805 | } | |
13fcb7bd | 2806 | aux.tp_padding = 0; |
ffbc6111 | 2807 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
8dc41944 HX |
2808 | } |
2809 | ||
1da177e4 LT |
2810 | /* |
2811 | * Free or return the buffer as appropriate. Again this | |
2812 | * hides all the races and re-entrancy issues from us. | |
2813 | */ | |
bfd5f4a3 | 2814 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
2815 | |
2816 | out_free: | |
2817 | skb_free_datagram(sk, skb); | |
2818 | out: | |
2819 | return err; | |
2820 | } | |
2821 | ||
1da177e4 LT |
2822 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
2823 | int *uaddr_len, int peer) | |
2824 | { | |
2825 | struct net_device *dev; | |
2826 | struct sock *sk = sock->sk; | |
2827 | ||
2828 | if (peer) | |
2829 | return -EOPNOTSUPP; | |
2830 | ||
2831 | uaddr->sa_family = AF_PACKET; | |
2dc85bf3 | 2832 | memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data)); |
654d1f8a ED |
2833 | rcu_read_lock(); |
2834 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
2835 | if (dev) | |
2dc85bf3 | 2836 | strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data)); |
654d1f8a | 2837 | rcu_read_unlock(); |
1da177e4 LT |
2838 | *uaddr_len = sizeof(*uaddr); |
2839 | ||
2840 | return 0; | |
2841 | } | |
1da177e4 LT |
2842 | |
2843 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
2844 | int *uaddr_len, int peer) | |
2845 | { | |
2846 | struct net_device *dev; | |
2847 | struct sock *sk = sock->sk; | |
2848 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 2849 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
2850 | |
2851 | if (peer) | |
2852 | return -EOPNOTSUPP; | |
2853 | ||
2854 | sll->sll_family = AF_PACKET; | |
2855 | sll->sll_ifindex = po->ifindex; | |
2856 | sll->sll_protocol = po->num; | |
67286640 | 2857 | sll->sll_pkttype = 0; |
654d1f8a ED |
2858 | rcu_read_lock(); |
2859 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
2860 | if (dev) { |
2861 | sll->sll_hatype = dev->type; | |
2862 | sll->sll_halen = dev->addr_len; | |
2863 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
2864 | } else { |
2865 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
2866 | sll->sll_halen = 0; | |
2867 | } | |
654d1f8a | 2868 | rcu_read_unlock(); |
0fb375fb | 2869 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
2870 | |
2871 | return 0; | |
2872 | } | |
2873 | ||
2aeb0b88 WC |
2874 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
2875 | int what) | |
1da177e4 LT |
2876 | { |
2877 | switch (i->type) { | |
2878 | case PACKET_MR_MULTICAST: | |
1162563f JP |
2879 | if (i->alen != dev->addr_len) |
2880 | return -EINVAL; | |
1da177e4 | 2881 | if (what > 0) |
22bedad3 | 2882 | return dev_mc_add(dev, i->addr); |
1da177e4 | 2883 | else |
22bedad3 | 2884 | return dev_mc_del(dev, i->addr); |
1da177e4 LT |
2885 | break; |
2886 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 2887 | return dev_set_promiscuity(dev, what); |
1da177e4 LT |
2888 | break; |
2889 | case PACKET_MR_ALLMULTI: | |
2aeb0b88 | 2890 | return dev_set_allmulti(dev, what); |
1da177e4 | 2891 | break; |
d95ed927 | 2892 | case PACKET_MR_UNICAST: |
1162563f JP |
2893 | if (i->alen != dev->addr_len) |
2894 | return -EINVAL; | |
d95ed927 | 2895 | if (what > 0) |
a748ee24 | 2896 | return dev_uc_add(dev, i->addr); |
d95ed927 | 2897 | else |
a748ee24 | 2898 | return dev_uc_del(dev, i->addr); |
d95ed927 | 2899 | break; |
40d4e3df ED |
2900 | default: |
2901 | break; | |
1da177e4 | 2902 | } |
2aeb0b88 | 2903 | return 0; |
1da177e4 LT |
2904 | } |
2905 | ||
2906 | static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) | |
2907 | { | |
40d4e3df | 2908 | for ( ; i; i = i->next) { |
1da177e4 LT |
2909 | if (i->ifindex == dev->ifindex) |
2910 | packet_dev_mc(dev, i, what); | |
2911 | } | |
2912 | } | |
2913 | ||
0fb375fb | 2914 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
2915 | { |
2916 | struct packet_sock *po = pkt_sk(sk); | |
2917 | struct packet_mclist *ml, *i; | |
2918 | struct net_device *dev; | |
2919 | int err; | |
2920 | ||
2921 | rtnl_lock(); | |
2922 | ||
2923 | err = -ENODEV; | |
3b1e0a65 | 2924 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
2925 | if (!dev) |
2926 | goto done; | |
2927 | ||
2928 | err = -EINVAL; | |
1162563f | 2929 | if (mreq->mr_alen > dev->addr_len) |
1da177e4 LT |
2930 | goto done; |
2931 | ||
2932 | err = -ENOBUFS; | |
8b3a7005 | 2933 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
2934 | if (i == NULL) |
2935 | goto done; | |
2936 | ||
2937 | err = 0; | |
2938 | for (ml = po->mclist; ml; ml = ml->next) { | |
2939 | if (ml->ifindex == mreq->mr_ifindex && | |
2940 | ml->type == mreq->mr_type && | |
2941 | ml->alen == mreq->mr_alen && | |
2942 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
2943 | ml->count++; | |
2944 | /* Free the new element ... */ | |
2945 | kfree(i); | |
2946 | goto done; | |
2947 | } | |
2948 | } | |
2949 | ||
2950 | i->type = mreq->mr_type; | |
2951 | i->ifindex = mreq->mr_ifindex; | |
2952 | i->alen = mreq->mr_alen; | |
2953 | memcpy(i->addr, mreq->mr_address, i->alen); | |
2954 | i->count = 1; | |
2955 | i->next = po->mclist; | |
2956 | po->mclist = i; | |
2aeb0b88 WC |
2957 | err = packet_dev_mc(dev, i, 1); |
2958 | if (err) { | |
2959 | po->mclist = i->next; | |
2960 | kfree(i); | |
2961 | } | |
1da177e4 LT |
2962 | |
2963 | done: | |
2964 | rtnl_unlock(); | |
2965 | return err; | |
2966 | } | |
2967 | ||
0fb375fb | 2968 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
2969 | { |
2970 | struct packet_mclist *ml, **mlp; | |
2971 | ||
2972 | rtnl_lock(); | |
2973 | ||
2974 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
2975 | if (ml->ifindex == mreq->mr_ifindex && | |
2976 | ml->type == mreq->mr_type && | |
2977 | ml->alen == mreq->mr_alen && | |
2978 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
2979 | if (--ml->count == 0) { | |
2980 | struct net_device *dev; | |
2981 | *mlp = ml->next; | |
ad959e76 ED |
2982 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
2983 | if (dev) | |
1da177e4 | 2984 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
2985 | kfree(ml); |
2986 | } | |
2987 | rtnl_unlock(); | |
2988 | return 0; | |
2989 | } | |
2990 | } | |
2991 | rtnl_unlock(); | |
2992 | return -EADDRNOTAVAIL; | |
2993 | } | |
2994 | ||
2995 | static void packet_flush_mclist(struct sock *sk) | |
2996 | { | |
2997 | struct packet_sock *po = pkt_sk(sk); | |
2998 | struct packet_mclist *ml; | |
2999 | ||
3000 | if (!po->mclist) | |
3001 | return; | |
3002 | ||
3003 | rtnl_lock(); | |
3004 | while ((ml = po->mclist) != NULL) { | |
3005 | struct net_device *dev; | |
3006 | ||
3007 | po->mclist = ml->next; | |
ad959e76 ED |
3008 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
3009 | if (dev != NULL) | |
1da177e4 | 3010 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
3011 | kfree(ml); |
3012 | } | |
3013 | rtnl_unlock(); | |
3014 | } | |
1da177e4 LT |
3015 | |
3016 | static int | |
b7058842 | 3017 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
3018 | { |
3019 | struct sock *sk = sock->sk; | |
8dc41944 | 3020 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
3021 | int ret; |
3022 | ||
3023 | if (level != SOL_PACKET) | |
3024 | return -ENOPROTOOPT; | |
3025 | ||
69e3c75f | 3026 | switch (optname) { |
1ce4f28b | 3027 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
3028 | case PACKET_DROP_MEMBERSHIP: |
3029 | { | |
0fb375fb EB |
3030 | struct packet_mreq_max mreq; |
3031 | int len = optlen; | |
3032 | memset(&mreq, 0, sizeof(mreq)); | |
3033 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 3034 | return -EINVAL; |
0fb375fb EB |
3035 | if (len > sizeof(mreq)) |
3036 | len = sizeof(mreq); | |
40d4e3df | 3037 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 3038 | return -EFAULT; |
0fb375fb EB |
3039 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
3040 | return -EINVAL; | |
1da177e4 LT |
3041 | if (optname == PACKET_ADD_MEMBERSHIP) |
3042 | ret = packet_mc_add(sk, &mreq); | |
3043 | else | |
3044 | ret = packet_mc_drop(sk, &mreq); | |
3045 | return ret; | |
3046 | } | |
a2efcfa0 | 3047 | |
1da177e4 | 3048 | case PACKET_RX_RING: |
69e3c75f | 3049 | case PACKET_TX_RING: |
1da177e4 | 3050 | { |
f6fb8f10 | 3051 | union tpacket_req_u req_u; |
3052 | int len; | |
1da177e4 | 3053 | |
f6fb8f10 | 3054 | switch (po->tp_version) { |
3055 | case TPACKET_V1: | |
3056 | case TPACKET_V2: | |
3057 | len = sizeof(req_u.req); | |
3058 | break; | |
3059 | case TPACKET_V3: | |
3060 | default: | |
3061 | len = sizeof(req_u.req3); | |
3062 | break; | |
3063 | } | |
3064 | if (optlen < len) | |
1da177e4 | 3065 | return -EINVAL; |
bfd5f4a3 SS |
3066 | if (pkt_sk(sk)->has_vnet_hdr) |
3067 | return -EINVAL; | |
f6fb8f10 | 3068 | if (copy_from_user(&req_u.req, optval, len)) |
1da177e4 | 3069 | return -EFAULT; |
f6fb8f10 | 3070 | return packet_set_ring(sk, &req_u, 0, |
3071 | optname == PACKET_TX_RING); | |
1da177e4 LT |
3072 | } |
3073 | case PACKET_COPY_THRESH: | |
3074 | { | |
3075 | int val; | |
3076 | ||
40d4e3df | 3077 | if (optlen != sizeof(val)) |
1da177e4 | 3078 | return -EINVAL; |
40d4e3df | 3079 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
3080 | return -EFAULT; |
3081 | ||
3082 | pkt_sk(sk)->copy_thresh = val; | |
3083 | return 0; | |
3084 | } | |
bbd6ef87 PM |
3085 | case PACKET_VERSION: |
3086 | { | |
3087 | int val; | |
3088 | ||
3089 | if (optlen != sizeof(val)) | |
3090 | return -EINVAL; | |
69e3c75f | 3091 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
3092 | return -EBUSY; |
3093 | if (copy_from_user(&val, optval, sizeof(val))) | |
3094 | return -EFAULT; | |
3095 | switch (val) { | |
3096 | case TPACKET_V1: | |
3097 | case TPACKET_V2: | |
f6fb8f10 | 3098 | case TPACKET_V3: |
bbd6ef87 PM |
3099 | po->tp_version = val; |
3100 | return 0; | |
3101 | default: | |
3102 | return -EINVAL; | |
3103 | } | |
3104 | } | |
8913336a PM |
3105 | case PACKET_RESERVE: |
3106 | { | |
3107 | unsigned int val; | |
3108 | ||
3109 | if (optlen != sizeof(val)) | |
3110 | return -EINVAL; | |
69e3c75f | 3111 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
3112 | return -EBUSY; |
3113 | if (copy_from_user(&val, optval, sizeof(val))) | |
3114 | return -EFAULT; | |
3115 | po->tp_reserve = val; | |
3116 | return 0; | |
3117 | } | |
69e3c75f JB |
3118 | case PACKET_LOSS: |
3119 | { | |
3120 | unsigned int val; | |
3121 | ||
3122 | if (optlen != sizeof(val)) | |
3123 | return -EINVAL; | |
3124 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3125 | return -EBUSY; | |
3126 | if (copy_from_user(&val, optval, sizeof(val))) | |
3127 | return -EFAULT; | |
3128 | po->tp_loss = !!val; | |
3129 | return 0; | |
3130 | } | |
8dc41944 HX |
3131 | case PACKET_AUXDATA: |
3132 | { | |
3133 | int val; | |
3134 | ||
3135 | if (optlen < sizeof(val)) | |
3136 | return -EINVAL; | |
3137 | if (copy_from_user(&val, optval, sizeof(val))) | |
3138 | return -EFAULT; | |
3139 | ||
3140 | po->auxdata = !!val; | |
3141 | return 0; | |
3142 | } | |
80feaacb PWJ |
3143 | case PACKET_ORIGDEV: |
3144 | { | |
3145 | int val; | |
3146 | ||
3147 | if (optlen < sizeof(val)) | |
3148 | return -EINVAL; | |
3149 | if (copy_from_user(&val, optval, sizeof(val))) | |
3150 | return -EFAULT; | |
3151 | ||
3152 | po->origdev = !!val; | |
3153 | return 0; | |
3154 | } | |
bfd5f4a3 SS |
3155 | case PACKET_VNET_HDR: |
3156 | { | |
3157 | int val; | |
3158 | ||
3159 | if (sock->type != SOCK_RAW) | |
3160 | return -EINVAL; | |
3161 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3162 | return -EBUSY; | |
3163 | if (optlen < sizeof(val)) | |
3164 | return -EINVAL; | |
3165 | if (copy_from_user(&val, optval, sizeof(val))) | |
3166 | return -EFAULT; | |
3167 | ||
3168 | po->has_vnet_hdr = !!val; | |
3169 | return 0; | |
3170 | } | |
614f60fa SM |
3171 | case PACKET_TIMESTAMP: |
3172 | { | |
3173 | int val; | |
3174 | ||
3175 | if (optlen != sizeof(val)) | |
3176 | return -EINVAL; | |
3177 | if (copy_from_user(&val, optval, sizeof(val))) | |
3178 | return -EFAULT; | |
3179 | ||
3180 | po->tp_tstamp = val; | |
3181 | return 0; | |
3182 | } | |
dc99f600 DM |
3183 | case PACKET_FANOUT: |
3184 | { | |
3185 | int val; | |
3186 | ||
3187 | if (optlen != sizeof(val)) | |
3188 | return -EINVAL; | |
3189 | if (copy_from_user(&val, optval, sizeof(val))) | |
3190 | return -EFAULT; | |
3191 | ||
3192 | return fanout_add(sk, val & 0xffff, val >> 16); | |
3193 | } | |
5920cd3a PC |
3194 | case PACKET_TX_HAS_OFF: |
3195 | { | |
3196 | unsigned int val; | |
3197 | ||
3198 | if (optlen != sizeof(val)) | |
3199 | return -EINVAL; | |
3200 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3201 | return -EBUSY; | |
3202 | if (copy_from_user(&val, optval, sizeof(val))) | |
3203 | return -EFAULT; | |
3204 | po->tp_tx_has_off = !!val; | |
3205 | return 0; | |
3206 | } | |
1da177e4 LT |
3207 | default: |
3208 | return -ENOPROTOOPT; | |
3209 | } | |
3210 | } | |
3211 | ||
3212 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
3213 | char __user *optval, int __user *optlen) | |
3214 | { | |
3215 | int len; | |
c06fff6e | 3216 | int val, lv = sizeof(val); |
1da177e4 LT |
3217 | struct sock *sk = sock->sk; |
3218 | struct packet_sock *po = pkt_sk(sk); | |
c06fff6e | 3219 | void *data = &val; |
ee80fbf3 | 3220 | union tpacket_stats_u st; |
1da177e4 LT |
3221 | |
3222 | if (level != SOL_PACKET) | |
3223 | return -ENOPROTOOPT; | |
3224 | ||
8ae55f04 KK |
3225 | if (get_user(len, optlen)) |
3226 | return -EFAULT; | |
1da177e4 LT |
3227 | |
3228 | if (len < 0) | |
3229 | return -EINVAL; | |
1ce4f28b | 3230 | |
69e3c75f | 3231 | switch (optname) { |
1da177e4 | 3232 | case PACKET_STATISTICS: |
1da177e4 | 3233 | spin_lock_bh(&sk->sk_receive_queue.lock); |
ee80fbf3 DB |
3234 | memcpy(&st, &po->stats, sizeof(st)); |
3235 | memset(&po->stats, 0, sizeof(po->stats)); | |
3236 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
3237 | ||
f6fb8f10 | 3238 | if (po->tp_version == TPACKET_V3) { |
c06fff6e | 3239 | lv = sizeof(struct tpacket_stats_v3); |
8bcdeaff | 3240 | st.stats3.tp_packets += st.stats3.tp_drops; |
ee80fbf3 | 3241 | data = &st.stats3; |
f6fb8f10 | 3242 | } else { |
c06fff6e | 3243 | lv = sizeof(struct tpacket_stats); |
8bcdeaff | 3244 | st.stats1.tp_packets += st.stats1.tp_drops; |
ee80fbf3 | 3245 | data = &st.stats1; |
f6fb8f10 | 3246 | } |
ee80fbf3 | 3247 | |
8dc41944 HX |
3248 | break; |
3249 | case PACKET_AUXDATA: | |
8dc41944 | 3250 | val = po->auxdata; |
80feaacb PWJ |
3251 | break; |
3252 | case PACKET_ORIGDEV: | |
80feaacb | 3253 | val = po->origdev; |
bfd5f4a3 SS |
3254 | break; |
3255 | case PACKET_VNET_HDR: | |
bfd5f4a3 | 3256 | val = po->has_vnet_hdr; |
1da177e4 | 3257 | break; |
bbd6ef87 | 3258 | case PACKET_VERSION: |
bbd6ef87 | 3259 | val = po->tp_version; |
bbd6ef87 PM |
3260 | break; |
3261 | case PACKET_HDRLEN: | |
3262 | if (len > sizeof(int)) | |
3263 | len = sizeof(int); | |
3264 | if (copy_from_user(&val, optval, len)) | |
3265 | return -EFAULT; | |
3266 | switch (val) { | |
3267 | case TPACKET_V1: | |
3268 | val = sizeof(struct tpacket_hdr); | |
3269 | break; | |
3270 | case TPACKET_V2: | |
3271 | val = sizeof(struct tpacket2_hdr); | |
3272 | break; | |
f6fb8f10 | 3273 | case TPACKET_V3: |
3274 | val = sizeof(struct tpacket3_hdr); | |
3275 | break; | |
bbd6ef87 PM |
3276 | default: |
3277 | return -EINVAL; | |
3278 | } | |
bbd6ef87 | 3279 | break; |
8913336a | 3280 | case PACKET_RESERVE: |
8913336a | 3281 | val = po->tp_reserve; |
8913336a | 3282 | break; |
69e3c75f | 3283 | case PACKET_LOSS: |
69e3c75f | 3284 | val = po->tp_loss; |
69e3c75f | 3285 | break; |
614f60fa | 3286 | case PACKET_TIMESTAMP: |
614f60fa | 3287 | val = po->tp_tstamp; |
614f60fa | 3288 | break; |
dc99f600 | 3289 | case PACKET_FANOUT: |
dc99f600 DM |
3290 | val = (po->fanout ? |
3291 | ((u32)po->fanout->id | | |
77f65ebd WB |
3292 | ((u32)po->fanout->type << 16) | |
3293 | ((u32)po->fanout->flags << 24)) : | |
dc99f600 | 3294 | 0); |
dc99f600 | 3295 | break; |
5920cd3a PC |
3296 | case PACKET_TX_HAS_OFF: |
3297 | val = po->tp_tx_has_off; | |
3298 | break; | |
1da177e4 LT |
3299 | default: |
3300 | return -ENOPROTOOPT; | |
3301 | } | |
3302 | ||
c06fff6e ED |
3303 | if (len > lv) |
3304 | len = lv; | |
8ae55f04 KK |
3305 | if (put_user(len, optlen)) |
3306 | return -EFAULT; | |
8dc41944 HX |
3307 | if (copy_to_user(optval, data, len)) |
3308 | return -EFAULT; | |
8ae55f04 | 3309 | return 0; |
1da177e4 LT |
3310 | } |
3311 | ||
3312 | ||
351638e7 JP |
3313 | static int packet_notifier(struct notifier_block *this, |
3314 | unsigned long msg, void *ptr) | |
1da177e4 LT |
3315 | { |
3316 | struct sock *sk; | |
351638e7 | 3317 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3318 | struct net *net = dev_net(dev); |
1da177e4 | 3319 | |
808f5114 | 3320 | rcu_read_lock(); |
b67bfe0d | 3321 | sk_for_each_rcu(sk, &net->packet.sklist) { |
1da177e4 LT |
3322 | struct packet_sock *po = pkt_sk(sk); |
3323 | ||
3324 | switch (msg) { | |
3325 | case NETDEV_UNREGISTER: | |
1da177e4 LT |
3326 | if (po->mclist) |
3327 | packet_dev_mclist(dev, po->mclist, -1); | |
a2efcfa0 DM |
3328 | /* fallthrough */ |
3329 | ||
1da177e4 LT |
3330 | case NETDEV_DOWN: |
3331 | if (dev->ifindex == po->ifindex) { | |
3332 | spin_lock(&po->bind_lock); | |
3333 | if (po->running) { | |
ce06b03e | 3334 | __unregister_prot_hook(sk, false); |
1da177e4 LT |
3335 | sk->sk_err = ENETDOWN; |
3336 | if (!sock_flag(sk, SOCK_DEAD)) | |
3337 | sk->sk_error_report(sk); | |
3338 | } | |
3339 | if (msg == NETDEV_UNREGISTER) { | |
3340 | po->ifindex = -1; | |
160ff18a BG |
3341 | if (po->prot_hook.dev) |
3342 | dev_put(po->prot_hook.dev); | |
1da177e4 LT |
3343 | po->prot_hook.dev = NULL; |
3344 | } | |
3345 | spin_unlock(&po->bind_lock); | |
3346 | } | |
3347 | break; | |
3348 | case NETDEV_UP: | |
808f5114 | 3349 | if (dev->ifindex == po->ifindex) { |
3350 | spin_lock(&po->bind_lock); | |
ce06b03e DM |
3351 | if (po->num) |
3352 | register_prot_hook(sk); | |
808f5114 | 3353 | spin_unlock(&po->bind_lock); |
1da177e4 | 3354 | } |
1da177e4 LT |
3355 | break; |
3356 | } | |
3357 | } | |
808f5114 | 3358 | rcu_read_unlock(); |
1da177e4 LT |
3359 | return NOTIFY_DONE; |
3360 | } | |
3361 | ||
3362 | ||
3363 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
3364 | unsigned long arg) | |
3365 | { | |
3366 | struct sock *sk = sock->sk; | |
3367 | ||
69e3c75f | 3368 | switch (cmd) { |
40d4e3df ED |
3369 | case SIOCOUTQ: |
3370 | { | |
3371 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 3372 | |
40d4e3df ED |
3373 | return put_user(amount, (int __user *)arg); |
3374 | } | |
3375 | case SIOCINQ: | |
3376 | { | |
3377 | struct sk_buff *skb; | |
3378 | int amount = 0; | |
3379 | ||
3380 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
3381 | skb = skb_peek(&sk->sk_receive_queue); | |
3382 | if (skb) | |
3383 | amount = skb->len; | |
3384 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
3385 | return put_user(amount, (int __user *)arg); | |
3386 | } | |
3387 | case SIOCGSTAMP: | |
3388 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
3389 | case SIOCGSTAMPNS: | |
3390 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 3391 | |
1da177e4 | 3392 | #ifdef CONFIG_INET |
40d4e3df ED |
3393 | case SIOCADDRT: |
3394 | case SIOCDELRT: | |
3395 | case SIOCDARP: | |
3396 | case SIOCGARP: | |
3397 | case SIOCSARP: | |
3398 | case SIOCGIFADDR: | |
3399 | case SIOCSIFADDR: | |
3400 | case SIOCGIFBRDADDR: | |
3401 | case SIOCSIFBRDADDR: | |
3402 | case SIOCGIFNETMASK: | |
3403 | case SIOCSIFNETMASK: | |
3404 | case SIOCGIFDSTADDR: | |
3405 | case SIOCSIFDSTADDR: | |
3406 | case SIOCSIFFLAGS: | |
40d4e3df | 3407 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
1da177e4 LT |
3408 | #endif |
3409 | ||
40d4e3df ED |
3410 | default: |
3411 | return -ENOIOCTLCMD; | |
1da177e4 LT |
3412 | } |
3413 | return 0; | |
3414 | } | |
3415 | ||
40d4e3df | 3416 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
3417 | poll_table *wait) |
3418 | { | |
3419 | struct sock *sk = sock->sk; | |
3420 | struct packet_sock *po = pkt_sk(sk); | |
3421 | unsigned int mask = datagram_poll(file, sock, wait); | |
3422 | ||
3423 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f | 3424 | if (po->rx_ring.pg_vec) { |
f6fb8f10 | 3425 | if (!packet_previous_rx_frame(po, &po->rx_ring, |
3426 | TP_STATUS_KERNEL)) | |
1da177e4 LT |
3427 | mask |= POLLIN | POLLRDNORM; |
3428 | } | |
3429 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f JB |
3430 | spin_lock_bh(&sk->sk_write_queue.lock); |
3431 | if (po->tx_ring.pg_vec) { | |
3432 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
3433 | mask |= POLLOUT | POLLWRNORM; | |
3434 | } | |
3435 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
3436 | return mask; |
3437 | } | |
3438 | ||
3439 | ||
3440 | /* Dirty? Well, I still did not learn better way to account | |
3441 | * for user mmaps. | |
3442 | */ | |
3443 | ||
3444 | static void packet_mm_open(struct vm_area_struct *vma) | |
3445 | { | |
3446 | struct file *file = vma->vm_file; | |
40d4e3df | 3447 | struct socket *sock = file->private_data; |
1da177e4 | 3448 | struct sock *sk = sock->sk; |
1ce4f28b | 3449 | |
1da177e4 LT |
3450 | if (sk) |
3451 | atomic_inc(&pkt_sk(sk)->mapped); | |
3452 | } | |
3453 | ||
3454 | static void packet_mm_close(struct vm_area_struct *vma) | |
3455 | { | |
3456 | struct file *file = vma->vm_file; | |
40d4e3df | 3457 | struct socket *sock = file->private_data; |
1da177e4 | 3458 | struct sock *sk = sock->sk; |
1ce4f28b | 3459 | |
1da177e4 LT |
3460 | if (sk) |
3461 | atomic_dec(&pkt_sk(sk)->mapped); | |
3462 | } | |
3463 | ||
f0f37e2f | 3464 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
3465 | .open = packet_mm_open, |
3466 | .close = packet_mm_close, | |
1da177e4 LT |
3467 | }; |
3468 | ||
0e3125c7 NH |
3469 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
3470 | unsigned int len) | |
1da177e4 LT |
3471 | { |
3472 | int i; | |
3473 | ||
4ebf0ae2 | 3474 | for (i = 0; i < len; i++) { |
0e3125c7 | 3475 | if (likely(pg_vec[i].buffer)) { |
c56b4d90 | 3476 | if (is_vmalloc_addr(pg_vec[i].buffer)) |
0e3125c7 NH |
3477 | vfree(pg_vec[i].buffer); |
3478 | else | |
3479 | free_pages((unsigned long)pg_vec[i].buffer, | |
3480 | order); | |
3481 | pg_vec[i].buffer = NULL; | |
3482 | } | |
1da177e4 LT |
3483 | } |
3484 | kfree(pg_vec); | |
3485 | } | |
3486 | ||
eea49cc9 | 3487 | static char *alloc_one_pg_vec_page(unsigned long order) |
4ebf0ae2 | 3488 | { |
0e3125c7 NH |
3489 | char *buffer = NULL; |
3490 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | | |
3491 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; | |
3492 | ||
3493 | buffer = (char *) __get_free_pages(gfp_flags, order); | |
3494 | ||
3495 | if (buffer) | |
3496 | return buffer; | |
3497 | ||
3498 | /* | |
3499 | * __get_free_pages failed, fall back to vmalloc | |
3500 | */ | |
bbce5a59 | 3501 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
719bfeaa | 3502 | |
0e3125c7 NH |
3503 | if (buffer) |
3504 | return buffer; | |
3505 | ||
3506 | /* | |
3507 | * vmalloc failed, lets dig into swap here | |
3508 | */ | |
0e3125c7 NH |
3509 | gfp_flags &= ~__GFP_NORETRY; |
3510 | buffer = (char *)__get_free_pages(gfp_flags, order); | |
3511 | if (buffer) | |
3512 | return buffer; | |
3513 | ||
3514 | /* | |
3515 | * complete and utter failure | |
3516 | */ | |
3517 | return NULL; | |
4ebf0ae2 DM |
3518 | } |
3519 | ||
0e3125c7 | 3520 | static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
4ebf0ae2 DM |
3521 | { |
3522 | unsigned int block_nr = req->tp_block_nr; | |
0e3125c7 | 3523 | struct pgv *pg_vec; |
4ebf0ae2 DM |
3524 | int i; |
3525 | ||
0e3125c7 | 3526 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
4ebf0ae2 DM |
3527 | if (unlikely(!pg_vec)) |
3528 | goto out; | |
3529 | ||
3530 | for (i = 0; i < block_nr; i++) { | |
c56b4d90 | 3531 | pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
0e3125c7 | 3532 | if (unlikely(!pg_vec[i].buffer)) |
4ebf0ae2 DM |
3533 | goto out_free_pgvec; |
3534 | } | |
3535 | ||
3536 | out: | |
3537 | return pg_vec; | |
3538 | ||
3539 | out_free_pgvec: | |
3540 | free_pg_vec(pg_vec, order, block_nr); | |
3541 | pg_vec = NULL; | |
3542 | goto out; | |
3543 | } | |
1da177e4 | 3544 | |
f6fb8f10 | 3545 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
69e3c75f | 3546 | int closing, int tx_ring) |
1da177e4 | 3547 | { |
0e3125c7 | 3548 | struct pgv *pg_vec = NULL; |
1da177e4 | 3549 | struct packet_sock *po = pkt_sk(sk); |
0e11c91e | 3550 | int was_running, order = 0; |
69e3c75f JB |
3551 | struct packet_ring_buffer *rb; |
3552 | struct sk_buff_head *rb_queue; | |
0e11c91e | 3553 | __be16 num; |
f6fb8f10 | 3554 | int err = -EINVAL; |
3555 | /* Added to avoid minimal code churn */ | |
3556 | struct tpacket_req *req = &req_u->req; | |
3557 | ||
3558 | /* Opening a Tx-ring is NOT supported in TPACKET_V3 */ | |
3559 | if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) { | |
3560 | WARN(1, "Tx-ring is not supported.\n"); | |
3561 | goto out; | |
3562 | } | |
1ce4f28b | 3563 | |
69e3c75f JB |
3564 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
3565 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 3566 | |
69e3c75f JB |
3567 | err = -EBUSY; |
3568 | if (!closing) { | |
3569 | if (atomic_read(&po->mapped)) | |
3570 | goto out; | |
3571 | if (atomic_read(&rb->pending)) | |
3572 | goto out; | |
3573 | } | |
1da177e4 | 3574 | |
69e3c75f JB |
3575 | if (req->tp_block_nr) { |
3576 | /* Sanity tests and some calculations */ | |
3577 | err = -EBUSY; | |
3578 | if (unlikely(rb->pg_vec)) | |
3579 | goto out; | |
1da177e4 | 3580 | |
bbd6ef87 PM |
3581 | switch (po->tp_version) { |
3582 | case TPACKET_V1: | |
3583 | po->tp_hdrlen = TPACKET_HDRLEN; | |
3584 | break; | |
3585 | case TPACKET_V2: | |
3586 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
3587 | break; | |
f6fb8f10 | 3588 | case TPACKET_V3: |
3589 | po->tp_hdrlen = TPACKET3_HDRLEN; | |
3590 | break; | |
bbd6ef87 PM |
3591 | } |
3592 | ||
69e3c75f | 3593 | err = -EINVAL; |
4ebf0ae2 | 3594 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 3595 | goto out; |
4ebf0ae2 | 3596 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 3597 | goto out; |
8913336a | 3598 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
3599 | po->tp_reserve)) |
3600 | goto out; | |
4ebf0ae2 | 3601 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 3602 | goto out; |
1da177e4 | 3603 | |
69e3c75f JB |
3604 | rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
3605 | if (unlikely(rb->frames_per_block <= 0)) | |
3606 | goto out; | |
3607 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
3608 | req->tp_frame_nr)) | |
3609 | goto out; | |
1da177e4 LT |
3610 | |
3611 | err = -ENOMEM; | |
4ebf0ae2 DM |
3612 | order = get_order(req->tp_block_size); |
3613 | pg_vec = alloc_pg_vec(req, order); | |
3614 | if (unlikely(!pg_vec)) | |
1da177e4 | 3615 | goto out; |
f6fb8f10 | 3616 | switch (po->tp_version) { |
3617 | case TPACKET_V3: | |
3618 | /* Transmit path is not supported. We checked | |
3619 | * it above but just being paranoid | |
3620 | */ | |
3621 | if (!tx_ring) | |
3622 | init_prb_bdqc(po, rb, pg_vec, req_u, tx_ring); | |
3623 | break; | |
3624 | default: | |
3625 | break; | |
3626 | } | |
69e3c75f JB |
3627 | } |
3628 | /* Done */ | |
3629 | else { | |
3630 | err = -EINVAL; | |
4ebf0ae2 | 3631 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 3632 | goto out; |
1da177e4 LT |
3633 | } |
3634 | ||
3635 | lock_sock(sk); | |
3636 | ||
3637 | /* Detach socket from network */ | |
3638 | spin_lock(&po->bind_lock); | |
3639 | was_running = po->running; | |
3640 | num = po->num; | |
3641 | if (was_running) { | |
1da177e4 | 3642 | po->num = 0; |
ce06b03e | 3643 | __unregister_prot_hook(sk, false); |
1da177e4 LT |
3644 | } |
3645 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 3646 | |
1da177e4 LT |
3647 | synchronize_net(); |
3648 | ||
3649 | err = -EBUSY; | |
905db440 | 3650 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
3651 | if (closing || atomic_read(&po->mapped) == 0) { |
3652 | err = 0; | |
69e3c75f | 3653 | spin_lock_bh(&rb_queue->lock); |
c053fd96 | 3654 | swap(rb->pg_vec, pg_vec); |
69e3c75f JB |
3655 | rb->frame_max = (req->tp_frame_nr - 1); |
3656 | rb->head = 0; | |
3657 | rb->frame_size = req->tp_frame_size; | |
3658 | spin_unlock_bh(&rb_queue->lock); | |
3659 | ||
c053fd96 CG |
3660 | swap(rb->pg_vec_order, order); |
3661 | swap(rb->pg_vec_len, req->tp_block_nr); | |
69e3c75f JB |
3662 | |
3663 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
3664 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
3665 | tpacket_rcv : packet_rcv; | |
3666 | skb_queue_purge(rb_queue); | |
1da177e4 | 3667 | if (atomic_read(&po->mapped)) |
40d4e3df ED |
3668 | pr_err("packet_mmap: vma is busy: %d\n", |
3669 | atomic_read(&po->mapped)); | |
1da177e4 | 3670 | } |
905db440 | 3671 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
3672 | |
3673 | spin_lock(&po->bind_lock); | |
ce06b03e | 3674 | if (was_running) { |
1da177e4 | 3675 | po->num = num; |
ce06b03e | 3676 | register_prot_hook(sk); |
1da177e4 LT |
3677 | } |
3678 | spin_unlock(&po->bind_lock); | |
f6fb8f10 | 3679 | if (closing && (po->tp_version > TPACKET_V2)) { |
3680 | /* Because we don't support block-based V3 on tx-ring */ | |
3681 | if (!tx_ring) | |
3682 | prb_shutdown_retire_blk_timer(po, tx_ring, rb_queue); | |
3683 | } | |
1da177e4 LT |
3684 | release_sock(sk); |
3685 | ||
1da177e4 LT |
3686 | if (pg_vec) |
3687 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
3688 | out: | |
3689 | return err; | |
3690 | } | |
3691 | ||
69e3c75f JB |
3692 | static int packet_mmap(struct file *file, struct socket *sock, |
3693 | struct vm_area_struct *vma) | |
1da177e4 LT |
3694 | { |
3695 | struct sock *sk = sock->sk; | |
3696 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
3697 | unsigned long size, expected_size; |
3698 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
3699 | unsigned long start; |
3700 | int err = -EINVAL; | |
3701 | int i; | |
3702 | ||
3703 | if (vma->vm_pgoff) | |
3704 | return -EINVAL; | |
3705 | ||
905db440 | 3706 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
3707 | |
3708 | expected_size = 0; | |
3709 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
3710 | if (rb->pg_vec) { | |
3711 | expected_size += rb->pg_vec_len | |
3712 | * rb->pg_vec_pages | |
3713 | * PAGE_SIZE; | |
3714 | } | |
3715 | } | |
3716 | ||
3717 | if (expected_size == 0) | |
1da177e4 | 3718 | goto out; |
69e3c75f JB |
3719 | |
3720 | size = vma->vm_end - vma->vm_start; | |
3721 | if (size != expected_size) | |
1da177e4 LT |
3722 | goto out; |
3723 | ||
1da177e4 | 3724 | start = vma->vm_start; |
69e3c75f JB |
3725 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
3726 | if (rb->pg_vec == NULL) | |
3727 | continue; | |
3728 | ||
3729 | for (i = 0; i < rb->pg_vec_len; i++) { | |
0e3125c7 NH |
3730 | struct page *page; |
3731 | void *kaddr = rb->pg_vec[i].buffer; | |
69e3c75f JB |
3732 | int pg_num; |
3733 | ||
c56b4d90 CG |
3734 | for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
3735 | page = pgv_to_page(kaddr); | |
69e3c75f JB |
3736 | err = vm_insert_page(vma, start, page); |
3737 | if (unlikely(err)) | |
3738 | goto out; | |
3739 | start += PAGE_SIZE; | |
0e3125c7 | 3740 | kaddr += PAGE_SIZE; |
69e3c75f | 3741 | } |
4ebf0ae2 | 3742 | } |
1da177e4 | 3743 | } |
69e3c75f | 3744 | |
4ebf0ae2 | 3745 | atomic_inc(&po->mapped); |
1da177e4 LT |
3746 | vma->vm_ops = &packet_mmap_ops; |
3747 | err = 0; | |
3748 | ||
3749 | out: | |
905db440 | 3750 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
3751 | return err; |
3752 | } | |
1da177e4 | 3753 | |
90ddc4f0 | 3754 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
3755 | .family = PF_PACKET, |
3756 | .owner = THIS_MODULE, | |
3757 | .release = packet_release, | |
3758 | .bind = packet_bind_spkt, | |
3759 | .connect = sock_no_connect, | |
3760 | .socketpair = sock_no_socketpair, | |
3761 | .accept = sock_no_accept, | |
3762 | .getname = packet_getname_spkt, | |
3763 | .poll = datagram_poll, | |
3764 | .ioctl = packet_ioctl, | |
3765 | .listen = sock_no_listen, | |
3766 | .shutdown = sock_no_shutdown, | |
3767 | .setsockopt = sock_no_setsockopt, | |
3768 | .getsockopt = sock_no_getsockopt, | |
3769 | .sendmsg = packet_sendmsg_spkt, | |
3770 | .recvmsg = packet_recvmsg, | |
3771 | .mmap = sock_no_mmap, | |
3772 | .sendpage = sock_no_sendpage, | |
3773 | }; | |
1da177e4 | 3774 | |
90ddc4f0 | 3775 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
3776 | .family = PF_PACKET, |
3777 | .owner = THIS_MODULE, | |
3778 | .release = packet_release, | |
3779 | .bind = packet_bind, | |
3780 | .connect = sock_no_connect, | |
3781 | .socketpair = sock_no_socketpair, | |
3782 | .accept = sock_no_accept, | |
1ce4f28b | 3783 | .getname = packet_getname, |
1da177e4 LT |
3784 | .poll = packet_poll, |
3785 | .ioctl = packet_ioctl, | |
3786 | .listen = sock_no_listen, | |
3787 | .shutdown = sock_no_shutdown, | |
3788 | .setsockopt = packet_setsockopt, | |
3789 | .getsockopt = packet_getsockopt, | |
3790 | .sendmsg = packet_sendmsg, | |
3791 | .recvmsg = packet_recvmsg, | |
3792 | .mmap = packet_mmap, | |
3793 | .sendpage = sock_no_sendpage, | |
3794 | }; | |
3795 | ||
ec1b4cf7 | 3796 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
3797 | .family = PF_PACKET, |
3798 | .create = packet_create, | |
3799 | .owner = THIS_MODULE, | |
3800 | }; | |
3801 | ||
3802 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 3803 | .notifier_call = packet_notifier, |
1da177e4 LT |
3804 | }; |
3805 | ||
3806 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
3807 | |
3808 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
808f5114 | 3809 | __acquires(RCU) |
1da177e4 | 3810 | { |
e372c414 | 3811 | struct net *net = seq_file_net(seq); |
808f5114 | 3812 | |
3813 | rcu_read_lock(); | |
3814 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); | |
1da177e4 LT |
3815 | } |
3816 | ||
3817 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3818 | { | |
1bf40954 | 3819 | struct net *net = seq_file_net(seq); |
808f5114 | 3820 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
1da177e4 LT |
3821 | } |
3822 | ||
3823 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
808f5114 | 3824 | __releases(RCU) |
1da177e4 | 3825 | { |
808f5114 | 3826 | rcu_read_unlock(); |
1da177e4 LT |
3827 | } |
3828 | ||
1ce4f28b | 3829 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
3830 | { |
3831 | if (v == SEQ_START_TOKEN) | |
3832 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
3833 | else { | |
b7ceabd9 | 3834 | struct sock *s = sk_entry(v); |
1da177e4 LT |
3835 | const struct packet_sock *po = pkt_sk(s); |
3836 | ||
3837 | seq_printf(seq, | |
71338aa7 | 3838 | "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
1da177e4 LT |
3839 | s, |
3840 | atomic_read(&s->sk_refcnt), | |
3841 | s->sk_type, | |
3842 | ntohs(po->num), | |
3843 | po->ifindex, | |
3844 | po->running, | |
3845 | atomic_read(&s->sk_rmem_alloc), | |
a7cb5a49 | 3846 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)), |
40d4e3df | 3847 | sock_i_ino(s)); |
1da177e4 LT |
3848 | } |
3849 | ||
3850 | return 0; | |
3851 | } | |
3852 | ||
56b3d975 | 3853 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
3854 | .start = packet_seq_start, |
3855 | .next = packet_seq_next, | |
3856 | .stop = packet_seq_stop, | |
3857 | .show = packet_seq_show, | |
3858 | }; | |
3859 | ||
3860 | static int packet_seq_open(struct inode *inode, struct file *file) | |
3861 | { | |
e372c414 DL |
3862 | return seq_open_net(inode, file, &packet_seq_ops, |
3863 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
3864 | } |
3865 | ||
da7071d7 | 3866 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
3867 | .owner = THIS_MODULE, |
3868 | .open = packet_seq_open, | |
3869 | .read = seq_read, | |
3870 | .llseek = seq_lseek, | |
e372c414 | 3871 | .release = seq_release_net, |
1da177e4 LT |
3872 | }; |
3873 | ||
3874 | #endif | |
3875 | ||
2c8c1e72 | 3876 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 3877 | { |
0fa7fa98 | 3878 | mutex_init(&net->packet.sklist_lock); |
2aaef4e4 | 3879 | INIT_HLIST_HEAD(&net->packet.sklist); |
d12d01d6 | 3880 | |
d4beaa66 | 3881 | if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops)) |
d12d01d6 DL |
3882 | return -ENOMEM; |
3883 | ||
3884 | return 0; | |
3885 | } | |
3886 | ||
2c8c1e72 | 3887 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 | 3888 | { |
ece31ffd | 3889 | remove_proc_entry("packet", net->proc_net); |
d12d01d6 DL |
3890 | } |
3891 | ||
3892 | static struct pernet_operations packet_net_ops = { | |
3893 | .init = packet_net_init, | |
3894 | .exit = packet_net_exit, | |
3895 | }; | |
3896 | ||
3897 | ||
1da177e4 LT |
3898 | static void __exit packet_exit(void) |
3899 | { | |
1da177e4 | 3900 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 3901 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
3902 | sock_unregister(PF_PACKET); |
3903 | proto_unregister(&packet_proto); | |
3904 | } | |
3905 | ||
3906 | static int __init packet_init(void) | |
3907 | { | |
3908 | int rc = proto_register(&packet_proto, 0); | |
3909 | ||
3910 | if (rc != 0) | |
3911 | goto out; | |
3912 | ||
3913 | sock_register(&packet_family_ops); | |
d12d01d6 | 3914 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 3915 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
3916 | out: |
3917 | return rc; | |
3918 | } | |
3919 | ||
3920 | module_init(packet_init); | |
3921 | module_exit(packet_exit); | |
3922 | MODULE_LICENSE("GPL"); | |
3923 | MODULE_ALIAS_NETPROTO(PF_PACKET); |