Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * PACKET - implements raw packet sockets. | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
11 | * | |
1ce4f28b | 12 | * Fixes: |
1da177e4 LT |
13 | * Alan Cox : verify_area() now used correctly |
14 | * Alan Cox : new skbuff lists, look ma no backlogs! | |
15 | * Alan Cox : tidied skbuff lists. | |
16 | * Alan Cox : Now uses generic datagram routines I | |
17 | * added. Also fixed the peek/read crash | |
18 | * from all old Linux datagram code. | |
19 | * Alan Cox : Uses the improved datagram code. | |
20 | * Alan Cox : Added NULL's for socket options. | |
21 | * Alan Cox : Re-commented the code. | |
22 | * Alan Cox : Use new kernel side addressing | |
23 | * Rob Janssen : Correct MTU usage. | |
24 | * Dave Platt : Counter leaks caused by incorrect | |
25 | * interrupt locking and some slightly | |
26 | * dubious gcc output. Can you read | |
27 | * compiler: it said _VOLATILE_ | |
28 | * Richard Kooijman : Timestamp fixes. | |
29 | * Alan Cox : New buffers. Use sk->mac.raw. | |
30 | * Alan Cox : sendmsg/recvmsg support. | |
31 | * Alan Cox : Protocol setting support | |
32 | * Alexey Kuznetsov : Untied from IPv4 stack. | |
33 | * Cyrus Durgin : Fixed kerneld for kmod. | |
34 | * Michal Ostrowski : Module initialization cleanup. | |
1ce4f28b | 35 | * Ulises Alonso : Frame number limit removal and |
1da177e4 | 36 | * packet_set_ring memory leak. |
0fb375fb EB |
37 | * Eric Biederman : Allow for > 8 byte hardware addresses. |
38 | * The convention is that longer addresses | |
39 | * will simply extend the hardware address | |
1ce4f28b | 40 | * byte arrays at the end of sockaddr_ll |
0fb375fb | 41 | * and packet_mreq. |
69e3c75f | 42 | * Johann Baudy : Added TX RING. |
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> |
b0138408 | 91 | #include <linux/percpu.h> |
1da177e4 LT |
92 | #ifdef CONFIG_INET |
93 | #include <net/inet_common.h> | |
94 | #endif | |
47dceb8e | 95 | #include <linux/bpf.h> |
1da177e4 | 96 | |
2787b04b PE |
97 | #include "internal.h" |
98 | ||
1da177e4 LT |
99 | /* |
100 | Assumptions: | |
101 | - if device has no dev->hard_header routine, it adds and removes ll header | |
102 | inside itself. In this case ll header is invisible outside of device, | |
103 | but higher levels still should reserve dev->hard_header_len. | |
104 | Some devices are enough clever to reallocate skb, when header | |
105 | will not fit to reserved space (tunnel), another ones are silly | |
106 | (PPP). | |
107 | - packet socket receives packets with pulled ll header, | |
108 | so that SOCK_RAW should push it back. | |
109 | ||
110 | On receive: | |
111 | ----------- | |
112 | ||
113 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
114 | mac_header -> ll header |
115 | data -> data | |
1da177e4 LT |
116 | |
117 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
118 | mac_header -> ll header |
119 | data -> ll header | |
1da177e4 LT |
120 | |
121 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
122 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
123 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 124 | assymetry between rx and tx paths. |
b0e380b1 | 125 | data -> data |
1da177e4 LT |
126 | |
127 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
128 | mac_header -> data. ll header is still not built! |
129 | data -> data | |
1da177e4 LT |
130 | |
131 | Resume | |
132 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
133 | ||
134 | ||
135 | On transmit: | |
136 | ------------ | |
137 | ||
138 | dev->hard_header != NULL | |
b0e380b1 ACM |
139 | mac_header -> ll header |
140 | data -> ll header | |
1da177e4 LT |
141 | |
142 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
143 | mac_header -> data |
144 | data -> data | |
1da177e4 LT |
145 | |
146 | We should set nh.raw on output to correct posistion, | |
147 | packet classifier depends on it. | |
148 | */ | |
149 | ||
1da177e4 LT |
150 | /* Private packet socket structures. */ |
151 | ||
0fb375fb EB |
152 | /* identical to struct packet_mreq except it has |
153 | * a longer address field. | |
154 | */ | |
40d4e3df | 155 | struct packet_mreq_max { |
0fb375fb EB |
156 | int mr_ifindex; |
157 | unsigned short mr_type; | |
158 | unsigned short mr_alen; | |
159 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 160 | }; |
a2efcfa0 | 161 | |
184f489e DB |
162 | union tpacket_uhdr { |
163 | struct tpacket_hdr *h1; | |
164 | struct tpacket2_hdr *h2; | |
165 | struct tpacket3_hdr *h3; | |
166 | void *raw; | |
167 | }; | |
168 | ||
f6fb8f10 | 169 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
69e3c75f JB |
170 | int closing, int tx_ring); |
171 | ||
f6fb8f10 | 172 | #define V3_ALIGNMENT (8) |
173 | ||
bc59ba39 | 174 | #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT)) |
f6fb8f10 | 175 | |
176 | #define BLK_PLUS_PRIV(sz_of_priv) \ | |
177 | (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT)) | |
178 | ||
f6fb8f10 | 179 | #define PGV_FROM_VMALLOC 1 |
69e3c75f | 180 | |
f6fb8f10 | 181 | #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status) |
182 | #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts) | |
183 | #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt) | |
184 | #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len) | |
185 | #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num) | |
186 | #define BLOCK_O2PRIV(x) ((x)->offset_to_priv) | |
187 | #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x))) | |
188 | ||
69e3c75f JB |
189 | struct packet_sock; |
190 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); | |
77f65ebd WB |
191 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
192 | struct packet_type *pt, struct net_device *orig_dev); | |
1da177e4 | 193 | |
f6fb8f10 | 194 | static void *packet_previous_frame(struct packet_sock *po, |
195 | struct packet_ring_buffer *rb, | |
196 | int status); | |
197 | static void packet_increment_head(struct packet_ring_buffer *buff); | |
bc59ba39 | 198 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *, |
199 | struct tpacket_block_desc *); | |
200 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *, | |
f6fb8f10 | 201 | struct packet_sock *); |
bc59ba39 | 202 | static void prb_retire_current_block(struct tpacket_kbdq_core *, |
f6fb8f10 | 203 | struct packet_sock *, unsigned int status); |
bc59ba39 | 204 | static int prb_queue_frozen(struct tpacket_kbdq_core *); |
205 | static void prb_open_block(struct tpacket_kbdq_core *, | |
206 | struct tpacket_block_desc *); | |
f6fb8f10 | 207 | static void prb_retire_rx_blk_timer_expired(unsigned long); |
bc59ba39 | 208 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *); |
209 | static void prb_init_blk_timer(struct packet_sock *, | |
210 | struct tpacket_kbdq_core *, | |
211 | void (*func) (unsigned long)); | |
212 | static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *); | |
213 | static void prb_clear_rxhash(struct tpacket_kbdq_core *, | |
214 | struct tpacket3_hdr *); | |
215 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *, | |
216 | struct tpacket3_hdr *); | |
1da177e4 LT |
217 | static void packet_flush_mclist(struct sock *sk); |
218 | ||
ffbc6111 | 219 | struct packet_skb_cb { |
ffbc6111 HX |
220 | union { |
221 | struct sockaddr_pkt pkt; | |
2472d761 EB |
222 | union { |
223 | /* Trick: alias skb original length with | |
224 | * ll.sll_family and ll.protocol in order | |
225 | * to save room. | |
226 | */ | |
227 | unsigned int origlen; | |
228 | struct sockaddr_ll ll; | |
229 | }; | |
ffbc6111 HX |
230 | } sa; |
231 | }; | |
232 | ||
d3869efe DW |
233 | #define vio_le() virtio_legacy_is_little_endian() |
234 | ||
ffbc6111 | 235 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
8dc41944 | 236 | |
bc59ba39 | 237 | #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc)) |
f6fb8f10 | 238 | #define GET_PBLOCK_DESC(x, bid) \ |
bc59ba39 | 239 | ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer)) |
f6fb8f10 | 240 | #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \ |
bc59ba39 | 241 | ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer)) |
f6fb8f10 | 242 | #define GET_NEXT_PRB_BLK_NUM(x) \ |
243 | (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \ | |
244 | ((x)->kactive_blk_num+1) : 0) | |
245 | ||
dc99f600 DM |
246 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po); |
247 | static void __fanout_link(struct sock *sk, struct packet_sock *po); | |
248 | ||
d346a3fa DB |
249 | static int packet_direct_xmit(struct sk_buff *skb) |
250 | { | |
251 | struct net_device *dev = skb->dev; | |
d346a3fa DB |
252 | netdev_features_t features; |
253 | struct netdev_queue *txq; | |
43279500 | 254 | int ret = NETDEV_TX_BUSY; |
d346a3fa DB |
255 | |
256 | if (unlikely(!netif_running(dev) || | |
43279500 DB |
257 | !netif_carrier_ok(dev))) |
258 | goto drop; | |
d346a3fa DB |
259 | |
260 | features = netif_skb_features(skb); | |
261 | if (skb_needs_linearize(skb, features) && | |
43279500 DB |
262 | __skb_linearize(skb)) |
263 | goto drop; | |
d346a3fa | 264 | |
10c51b56 | 265 | txq = skb_get_tx_queue(dev, skb); |
d346a3fa | 266 | |
43279500 DB |
267 | local_bh_disable(); |
268 | ||
269 | HARD_TX_LOCK(dev, txq, smp_processor_id()); | |
10b3ad8c | 270 | if (!netif_xmit_frozen_or_drv_stopped(txq)) |
fa2dbdc2 | 271 | ret = netdev_start_xmit(skb, dev, txq, false); |
43279500 | 272 | HARD_TX_UNLOCK(dev, txq); |
d346a3fa | 273 | |
43279500 DB |
274 | local_bh_enable(); |
275 | ||
276 | if (!dev_xmit_complete(ret)) | |
d346a3fa | 277 | kfree_skb(skb); |
43279500 | 278 | |
d346a3fa | 279 | return ret; |
43279500 | 280 | drop: |
0f97ede4 | 281 | atomic_long_inc(&dev->tx_dropped); |
43279500 DB |
282 | kfree_skb(skb); |
283 | return NET_XMIT_DROP; | |
d346a3fa DB |
284 | } |
285 | ||
66e56cd4 DB |
286 | static struct net_device *packet_cached_dev_get(struct packet_sock *po) |
287 | { | |
288 | struct net_device *dev; | |
289 | ||
290 | rcu_read_lock(); | |
291 | dev = rcu_dereference(po->cached_dev); | |
292 | if (likely(dev)) | |
293 | dev_hold(dev); | |
294 | rcu_read_unlock(); | |
295 | ||
296 | return dev; | |
297 | } | |
298 | ||
299 | static void packet_cached_dev_assign(struct packet_sock *po, | |
300 | struct net_device *dev) | |
301 | { | |
302 | rcu_assign_pointer(po->cached_dev, dev); | |
303 | } | |
304 | ||
305 | static void packet_cached_dev_reset(struct packet_sock *po) | |
306 | { | |
307 | RCU_INIT_POINTER(po->cached_dev, NULL); | |
308 | } | |
309 | ||
d346a3fa DB |
310 | static bool packet_use_direct_xmit(const struct packet_sock *po) |
311 | { | |
312 | return po->xmit == packet_direct_xmit; | |
313 | } | |
314 | ||
0fd5d57b | 315 | static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb) |
d346a3fa | 316 | { |
1cbac010 | 317 | return (u16) raw_smp_processor_id() % dev->real_num_tx_queues; |
d346a3fa DB |
318 | } |
319 | ||
0fd5d57b DB |
320 | static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb) |
321 | { | |
322 | const struct net_device_ops *ops = dev->netdev_ops; | |
323 | u16 queue_index; | |
324 | ||
325 | if (ops->ndo_select_queue) { | |
326 | queue_index = ops->ndo_select_queue(dev, skb, NULL, | |
327 | __packet_pick_tx_queue); | |
328 | queue_index = netdev_cap_txqueue(dev, queue_index); | |
329 | } else { | |
330 | queue_index = __packet_pick_tx_queue(dev, skb); | |
331 | } | |
332 | ||
333 | skb_set_queue_mapping(skb, queue_index); | |
334 | } | |
335 | ||
ce06b03e DM |
336 | /* register_prot_hook must be invoked with the po->bind_lock held, |
337 | * or from a context in which asynchronous accesses to the packet | |
338 | * socket is not possible (packet_create()). | |
339 | */ | |
340 | static void register_prot_hook(struct sock *sk) | |
341 | { | |
342 | struct packet_sock *po = pkt_sk(sk); | |
e40526cb | 343 | |
ce06b03e | 344 | if (!po->running) { |
66e56cd4 | 345 | if (po->fanout) |
dc99f600 | 346 | __fanout_link(sk, po); |
66e56cd4 | 347 | else |
dc99f600 | 348 | dev_add_pack(&po->prot_hook); |
e40526cb | 349 | |
ce06b03e DM |
350 | sock_hold(sk); |
351 | po->running = 1; | |
352 | } | |
353 | } | |
354 | ||
355 | /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock | |
356 | * held. If the sync parameter is true, we will temporarily drop | |
357 | * the po->bind_lock and do a synchronize_net to make sure no | |
358 | * asynchronous packet processing paths still refer to the elements | |
359 | * of po->prot_hook. If the sync parameter is false, it is the | |
360 | * callers responsibility to take care of this. | |
361 | */ | |
362 | static void __unregister_prot_hook(struct sock *sk, bool sync) | |
363 | { | |
364 | struct packet_sock *po = pkt_sk(sk); | |
365 | ||
366 | po->running = 0; | |
66e56cd4 DB |
367 | |
368 | if (po->fanout) | |
dc99f600 | 369 | __fanout_unlink(sk, po); |
66e56cd4 | 370 | else |
dc99f600 | 371 | __dev_remove_pack(&po->prot_hook); |
e40526cb | 372 | |
ce06b03e DM |
373 | __sock_put(sk); |
374 | ||
375 | if (sync) { | |
376 | spin_unlock(&po->bind_lock); | |
377 | synchronize_net(); | |
378 | spin_lock(&po->bind_lock); | |
379 | } | |
380 | } | |
381 | ||
382 | static void unregister_prot_hook(struct sock *sk, bool sync) | |
383 | { | |
384 | struct packet_sock *po = pkt_sk(sk); | |
385 | ||
386 | if (po->running) | |
387 | __unregister_prot_hook(sk, sync); | |
388 | } | |
389 | ||
6e58040b | 390 | static inline struct page * __pure pgv_to_page(void *addr) |
0af55bb5 CG |
391 | { |
392 | if (is_vmalloc_addr(addr)) | |
393 | return vmalloc_to_page(addr); | |
394 | return virt_to_page(addr); | |
395 | } | |
396 | ||
69e3c75f | 397 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 398 | { |
184f489e | 399 | union tpacket_uhdr h; |
1da177e4 | 400 | |
69e3c75f | 401 | h.raw = frame; |
bbd6ef87 PM |
402 | switch (po->tp_version) { |
403 | case TPACKET_V1: | |
69e3c75f | 404 | h.h1->tp_status = status; |
0af55bb5 | 405 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
bbd6ef87 PM |
406 | break; |
407 | case TPACKET_V2: | |
69e3c75f | 408 | h.h2->tp_status = status; |
0af55bb5 | 409 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
bbd6ef87 | 410 | break; |
f6fb8f10 | 411 | case TPACKET_V3: |
69e3c75f | 412 | default: |
f6fb8f10 | 413 | WARN(1, "TPACKET version not supported.\n"); |
69e3c75f | 414 | BUG(); |
bbd6ef87 | 415 | } |
69e3c75f JB |
416 | |
417 | smp_wmb(); | |
bbd6ef87 PM |
418 | } |
419 | ||
69e3c75f | 420 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 | 421 | { |
184f489e | 422 | union tpacket_uhdr h; |
bbd6ef87 | 423 | |
69e3c75f JB |
424 | smp_rmb(); |
425 | ||
bbd6ef87 PM |
426 | h.raw = frame; |
427 | switch (po->tp_version) { | |
428 | case TPACKET_V1: | |
0af55bb5 | 429 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
69e3c75f | 430 | return h.h1->tp_status; |
bbd6ef87 | 431 | case TPACKET_V2: |
0af55bb5 | 432 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
69e3c75f | 433 | return h.h2->tp_status; |
f6fb8f10 | 434 | case TPACKET_V3: |
69e3c75f | 435 | default: |
f6fb8f10 | 436 | WARN(1, "TPACKET version not supported.\n"); |
69e3c75f JB |
437 | BUG(); |
438 | return 0; | |
bbd6ef87 | 439 | } |
1da177e4 | 440 | } |
69e3c75f | 441 | |
b9c32fb2 DB |
442 | static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts, |
443 | unsigned int flags) | |
7a51384c DB |
444 | { |
445 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); | |
446 | ||
68a360e8 WB |
447 | if (shhwtstamps && |
448 | (flags & SOF_TIMESTAMPING_RAW_HARDWARE) && | |
449 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts)) | |
450 | return TP_STATUS_TS_RAW_HARDWARE; | |
7a51384c DB |
451 | |
452 | if (ktime_to_timespec_cond(skb->tstamp, ts)) | |
b9c32fb2 | 453 | return TP_STATUS_TS_SOFTWARE; |
7a51384c | 454 | |
b9c32fb2 | 455 | return 0; |
7a51384c DB |
456 | } |
457 | ||
b9c32fb2 DB |
458 | static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame, |
459 | struct sk_buff *skb) | |
2e31396f WB |
460 | { |
461 | union tpacket_uhdr h; | |
462 | struct timespec ts; | |
b9c32fb2 | 463 | __u32 ts_status; |
2e31396f | 464 | |
b9c32fb2 DB |
465 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
466 | return 0; | |
2e31396f WB |
467 | |
468 | h.raw = frame; | |
469 | switch (po->tp_version) { | |
470 | case TPACKET_V1: | |
471 | h.h1->tp_sec = ts.tv_sec; | |
472 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; | |
473 | break; | |
474 | case TPACKET_V2: | |
475 | h.h2->tp_sec = ts.tv_sec; | |
476 | h.h2->tp_nsec = ts.tv_nsec; | |
477 | break; | |
478 | case TPACKET_V3: | |
479 | default: | |
480 | WARN(1, "TPACKET version not supported.\n"); | |
481 | BUG(); | |
482 | } | |
483 | ||
484 | /* one flush is safe, as both fields always lie on the same cacheline */ | |
485 | flush_dcache_page(pgv_to_page(&h.h1->tp_sec)); | |
486 | smp_wmb(); | |
b9c32fb2 DB |
487 | |
488 | return ts_status; | |
2e31396f WB |
489 | } |
490 | ||
69e3c75f JB |
491 | static void *packet_lookup_frame(struct packet_sock *po, |
492 | struct packet_ring_buffer *rb, | |
493 | unsigned int position, | |
494 | int status) | |
495 | { | |
496 | unsigned int pg_vec_pos, frame_offset; | |
184f489e | 497 | union tpacket_uhdr h; |
69e3c75f JB |
498 | |
499 | pg_vec_pos = position / rb->frames_per_block; | |
500 | frame_offset = position % rb->frames_per_block; | |
501 | ||
0e3125c7 NH |
502 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
503 | (frame_offset * rb->frame_size); | |
69e3c75f JB |
504 | |
505 | if (status != __packet_get_status(po, h.raw)) | |
506 | return NULL; | |
507 | ||
508 | return h.raw; | |
509 | } | |
510 | ||
eea49cc9 | 511 | static void *packet_current_frame(struct packet_sock *po, |
69e3c75f JB |
512 | struct packet_ring_buffer *rb, |
513 | int status) | |
514 | { | |
515 | return packet_lookup_frame(po, rb, rb->head, status); | |
516 | } | |
517 | ||
bc59ba39 | 518 | static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 519 | { |
520 | del_timer_sync(&pkc->retire_blk_timer); | |
521 | } | |
522 | ||
523 | static void prb_shutdown_retire_blk_timer(struct packet_sock *po, | |
f6fb8f10 | 524 | struct sk_buff_head *rb_queue) |
525 | { | |
bc59ba39 | 526 | struct tpacket_kbdq_core *pkc; |
f6fb8f10 | 527 | |
73d0fcf2 | 528 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 529 | |
ec6f809f | 530 | spin_lock_bh(&rb_queue->lock); |
f6fb8f10 | 531 | pkc->delete_blk_timer = 1; |
ec6f809f | 532 | spin_unlock_bh(&rb_queue->lock); |
f6fb8f10 | 533 | |
534 | prb_del_retire_blk_timer(pkc); | |
535 | } | |
536 | ||
537 | static void prb_init_blk_timer(struct packet_sock *po, | |
bc59ba39 | 538 | struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 539 | void (*func) (unsigned long)) |
540 | { | |
541 | init_timer(&pkc->retire_blk_timer); | |
542 | pkc->retire_blk_timer.data = (long)po; | |
543 | pkc->retire_blk_timer.function = func; | |
544 | pkc->retire_blk_timer.expires = jiffies; | |
545 | } | |
546 | ||
e8e85cc5 | 547 | static void prb_setup_retire_blk_timer(struct packet_sock *po) |
f6fb8f10 | 548 | { |
bc59ba39 | 549 | struct tpacket_kbdq_core *pkc; |
f6fb8f10 | 550 | |
e8e85cc5 | 551 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 552 | prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired); |
553 | } | |
554 | ||
555 | static int prb_calc_retire_blk_tmo(struct packet_sock *po, | |
556 | int blk_size_in_bytes) | |
557 | { | |
558 | struct net_device *dev; | |
559 | unsigned int mbits = 0, msec = 0, div = 0, tmo = 0; | |
4bc71cb9 JP |
560 | struct ethtool_cmd ecmd; |
561 | int err; | |
e440cf2c | 562 | u32 speed; |
f6fb8f10 | 563 | |
4bc71cb9 JP |
564 | rtnl_lock(); |
565 | dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex); | |
566 | if (unlikely(!dev)) { | |
567 | rtnl_unlock(); | |
f6fb8f10 | 568 | return DEFAULT_PRB_RETIRE_TOV; |
4bc71cb9 JP |
569 | } |
570 | err = __ethtool_get_settings(dev, &ecmd); | |
e440cf2c | 571 | speed = ethtool_cmd_speed(&ecmd); |
4bc71cb9 JP |
572 | rtnl_unlock(); |
573 | if (!err) { | |
4bc71cb9 JP |
574 | /* |
575 | * If the link speed is so slow you don't really | |
576 | * need to worry about perf anyways | |
577 | */ | |
e440cf2c | 578 | if (speed < SPEED_1000 || speed == SPEED_UNKNOWN) { |
4bc71cb9 | 579 | return DEFAULT_PRB_RETIRE_TOV; |
e440cf2c | 580 | } else { |
581 | msec = 1; | |
582 | div = speed / 1000; | |
f6fb8f10 | 583 | } |
584 | } | |
585 | ||
586 | mbits = (blk_size_in_bytes * 8) / (1024 * 1024); | |
587 | ||
588 | if (div) | |
589 | mbits /= div; | |
590 | ||
591 | tmo = mbits * msec; | |
592 | ||
593 | if (div) | |
594 | return tmo+1; | |
595 | return tmo; | |
596 | } | |
597 | ||
bc59ba39 | 598 | static void prb_init_ft_ops(struct tpacket_kbdq_core *p1, |
f6fb8f10 | 599 | union tpacket_req_u *req_u) |
600 | { | |
601 | p1->feature_req_word = req_u->req3.tp_feature_req_word; | |
602 | } | |
603 | ||
604 | static void init_prb_bdqc(struct packet_sock *po, | |
605 | struct packet_ring_buffer *rb, | |
606 | struct pgv *pg_vec, | |
e8e85cc5 | 607 | union tpacket_req_u *req_u) |
f6fb8f10 | 608 | { |
22781a5b | 609 | struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb); |
bc59ba39 | 610 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 611 | |
612 | memset(p1, 0x0, sizeof(*p1)); | |
613 | ||
614 | p1->knxt_seq_num = 1; | |
615 | p1->pkbdq = pg_vec; | |
bc59ba39 | 616 | pbd = (struct tpacket_block_desc *)pg_vec[0].buffer; |
e3192690 | 617 | p1->pkblk_start = pg_vec[0].buffer; |
f6fb8f10 | 618 | p1->kblk_size = req_u->req3.tp_block_size; |
619 | p1->knum_blocks = req_u->req3.tp_block_nr; | |
620 | p1->hdrlen = po->tp_hdrlen; | |
621 | p1->version = po->tp_version; | |
622 | p1->last_kactive_blk_num = 0; | |
ee80fbf3 | 623 | po->stats.stats3.tp_freeze_q_cnt = 0; |
f6fb8f10 | 624 | if (req_u->req3.tp_retire_blk_tov) |
625 | p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov; | |
626 | else | |
627 | p1->retire_blk_tov = prb_calc_retire_blk_tmo(po, | |
628 | req_u->req3.tp_block_size); | |
629 | p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov); | |
630 | p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv; | |
631 | ||
dc808110 | 632 | p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv); |
f6fb8f10 | 633 | prb_init_ft_ops(p1, req_u); |
e8e85cc5 | 634 | prb_setup_retire_blk_timer(po); |
f6fb8f10 | 635 | prb_open_block(p1, pbd); |
636 | } | |
637 | ||
638 | /* Do NOT update the last_blk_num first. | |
639 | * Assumes sk_buff_head lock is held. | |
640 | */ | |
bc59ba39 | 641 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 642 | { |
643 | mod_timer(&pkc->retire_blk_timer, | |
644 | jiffies + pkc->tov_in_jiffies); | |
645 | pkc->last_kactive_blk_num = pkc->kactive_blk_num; | |
646 | } | |
647 | ||
648 | /* | |
649 | * Timer logic: | |
650 | * 1) We refresh the timer only when we open a block. | |
651 | * By doing this we don't waste cycles refreshing the timer | |
652 | * on packet-by-packet basis. | |
653 | * | |
654 | * With a 1MB block-size, on a 1Gbps line, it will take | |
655 | * i) ~8 ms to fill a block + ii) memcpy etc. | |
656 | * In this cut we are not accounting for the memcpy time. | |
657 | * | |
658 | * So, if the user sets the 'tmo' to 10ms then the timer | |
659 | * will never fire while the block is still getting filled | |
660 | * (which is what we want). However, the user could choose | |
661 | * to close a block early and that's fine. | |
662 | * | |
663 | * But when the timer does fire, we check whether or not to refresh it. | |
664 | * Since the tmo granularity is in msecs, it is not too expensive | |
665 | * to refresh the timer, lets say every '8' msecs. | |
666 | * Either the user can set the 'tmo' or we can derive it based on | |
667 | * a) line-speed and b) block-size. | |
668 | * prb_calc_retire_blk_tmo() calculates the tmo. | |
669 | * | |
670 | */ | |
671 | static void prb_retire_rx_blk_timer_expired(unsigned long data) | |
672 | { | |
673 | struct packet_sock *po = (struct packet_sock *)data; | |
22781a5b | 674 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 675 | unsigned int frozen; |
bc59ba39 | 676 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 677 | |
678 | spin_lock(&po->sk.sk_receive_queue.lock); | |
679 | ||
680 | frozen = prb_queue_frozen(pkc); | |
681 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
682 | ||
683 | if (unlikely(pkc->delete_blk_timer)) | |
684 | goto out; | |
685 | ||
686 | /* We only need to plug the race when the block is partially filled. | |
687 | * tpacket_rcv: | |
688 | * lock(); increment BLOCK_NUM_PKTS; unlock() | |
689 | * copy_bits() is in progress ... | |
690 | * timer fires on other cpu: | |
691 | * we can't retire the current block because copy_bits | |
692 | * is in progress. | |
693 | * | |
694 | */ | |
695 | if (BLOCK_NUM_PKTS(pbd)) { | |
696 | while (atomic_read(&pkc->blk_fill_in_prog)) { | |
697 | /* Waiting for skb_copy_bits to finish... */ | |
698 | cpu_relax(); | |
699 | } | |
700 | } | |
701 | ||
702 | if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) { | |
703 | if (!frozen) { | |
41a50d62 AD |
704 | if (!BLOCK_NUM_PKTS(pbd)) { |
705 | /* An empty block. Just refresh the timer. */ | |
706 | goto refresh_timer; | |
707 | } | |
f6fb8f10 | 708 | prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO); |
709 | if (!prb_dispatch_next_block(pkc, po)) | |
710 | goto refresh_timer; | |
711 | else | |
712 | goto out; | |
713 | } else { | |
714 | /* Case 1. Queue was frozen because user-space was | |
715 | * lagging behind. | |
716 | */ | |
717 | if (prb_curr_blk_in_use(pkc, pbd)) { | |
718 | /* | |
719 | * Ok, user-space is still behind. | |
720 | * So just refresh the timer. | |
721 | */ | |
722 | goto refresh_timer; | |
723 | } else { | |
724 | /* Case 2. queue was frozen,user-space caught up, | |
725 | * now the link went idle && the timer fired. | |
726 | * We don't have a block to close.So we open this | |
727 | * block and restart the timer. | |
728 | * opening a block thaws the queue,restarts timer | |
729 | * Thawing/timer-refresh is a side effect. | |
730 | */ | |
731 | prb_open_block(pkc, pbd); | |
732 | goto out; | |
733 | } | |
734 | } | |
735 | } | |
736 | ||
737 | refresh_timer: | |
738 | _prb_refresh_rx_retire_blk_timer(pkc); | |
739 | ||
740 | out: | |
741 | spin_unlock(&po->sk.sk_receive_queue.lock); | |
742 | } | |
743 | ||
eea49cc9 | 744 | static void prb_flush_block(struct tpacket_kbdq_core *pkc1, |
bc59ba39 | 745 | struct tpacket_block_desc *pbd1, __u32 status) |
f6fb8f10 | 746 | { |
747 | /* Flush everything minus the block header */ | |
748 | ||
749 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 | |
750 | u8 *start, *end; | |
751 | ||
752 | start = (u8 *)pbd1; | |
753 | ||
754 | /* Skip the block header(we know header WILL fit in 4K) */ | |
755 | start += PAGE_SIZE; | |
756 | ||
757 | end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end); | |
758 | for (; start < end; start += PAGE_SIZE) | |
759 | flush_dcache_page(pgv_to_page(start)); | |
760 | ||
761 | smp_wmb(); | |
762 | #endif | |
763 | ||
764 | /* Now update the block status. */ | |
765 | ||
766 | BLOCK_STATUS(pbd1) = status; | |
767 | ||
768 | /* Flush the block header */ | |
769 | ||
770 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 | |
771 | start = (u8 *)pbd1; | |
772 | flush_dcache_page(pgv_to_page(start)); | |
773 | ||
774 | smp_wmb(); | |
775 | #endif | |
776 | } | |
777 | ||
778 | /* | |
779 | * Side effect: | |
780 | * | |
781 | * 1) flush the block | |
782 | * 2) Increment active_blk_num | |
783 | * | |
784 | * Note:We DONT refresh the timer on purpose. | |
785 | * Because almost always the next block will be opened. | |
786 | */ | |
bc59ba39 | 787 | static void prb_close_block(struct tpacket_kbdq_core *pkc1, |
788 | struct tpacket_block_desc *pbd1, | |
f6fb8f10 | 789 | struct packet_sock *po, unsigned int stat) |
790 | { | |
791 | __u32 status = TP_STATUS_USER | stat; | |
792 | ||
793 | struct tpacket3_hdr *last_pkt; | |
bc59ba39 | 794 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
da413eec | 795 | struct sock *sk = &po->sk; |
f6fb8f10 | 796 | |
ee80fbf3 | 797 | if (po->stats.stats3.tp_drops) |
f6fb8f10 | 798 | status |= TP_STATUS_LOSING; |
799 | ||
800 | last_pkt = (struct tpacket3_hdr *)pkc1->prev; | |
801 | last_pkt->tp_next_offset = 0; | |
802 | ||
803 | /* Get the ts of the last pkt */ | |
804 | if (BLOCK_NUM_PKTS(pbd1)) { | |
805 | h1->ts_last_pkt.ts_sec = last_pkt->tp_sec; | |
806 | h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec; | |
807 | } else { | |
41a50d62 AD |
808 | /* Ok, we tmo'd - so get the current time. |
809 | * | |
810 | * It shouldn't really happen as we don't close empty | |
811 | * blocks. See prb_retire_rx_blk_timer_expired(). | |
812 | */ | |
f6fb8f10 | 813 | struct timespec ts; |
814 | getnstimeofday(&ts); | |
815 | h1->ts_last_pkt.ts_sec = ts.tv_sec; | |
816 | h1->ts_last_pkt.ts_nsec = ts.tv_nsec; | |
817 | } | |
818 | ||
819 | smp_wmb(); | |
820 | ||
821 | /* Flush the block */ | |
822 | prb_flush_block(pkc1, pbd1, status); | |
823 | ||
da413eec DC |
824 | sk->sk_data_ready(sk); |
825 | ||
f6fb8f10 | 826 | pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1); |
827 | } | |
828 | ||
eea49cc9 | 829 | static void prb_thaw_queue(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 830 | { |
831 | pkc->reset_pending_on_curr_blk = 0; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Side effect of opening a block: | |
836 | * | |
837 | * 1) prb_queue is thawed. | |
838 | * 2) retire_blk_timer is refreshed. | |
839 | * | |
840 | */ | |
bc59ba39 | 841 | static void prb_open_block(struct tpacket_kbdq_core *pkc1, |
842 | struct tpacket_block_desc *pbd1) | |
f6fb8f10 | 843 | { |
844 | struct timespec ts; | |
bc59ba39 | 845 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
f6fb8f10 | 846 | |
847 | smp_rmb(); | |
848 | ||
8da3056c DB |
849 | /* We could have just memset this but we will lose the |
850 | * flexibility of making the priv area sticky | |
851 | */ | |
f6fb8f10 | 852 | |
8da3056c DB |
853 | BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++; |
854 | BLOCK_NUM_PKTS(pbd1) = 0; | |
855 | BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
f6fb8f10 | 856 | |
8da3056c DB |
857 | getnstimeofday(&ts); |
858 | ||
859 | h1->ts_first_pkt.ts_sec = ts.tv_sec; | |
860 | h1->ts_first_pkt.ts_nsec = ts.tv_nsec; | |
f6fb8f10 | 861 | |
8da3056c DB |
862 | pkc1->pkblk_start = (char *)pbd1; |
863 | pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
864 | ||
865 | BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
866 | BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN; | |
867 | ||
868 | pbd1->version = pkc1->version; | |
869 | pkc1->prev = pkc1->nxt_offset; | |
870 | pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size; | |
871 | ||
872 | prb_thaw_queue(pkc1); | |
873 | _prb_refresh_rx_retire_blk_timer(pkc1); | |
874 | ||
875 | smp_wmb(); | |
f6fb8f10 | 876 | } |
877 | ||
878 | /* | |
879 | * Queue freeze logic: | |
880 | * 1) Assume tp_block_nr = 8 blocks. | |
881 | * 2) At time 't0', user opens Rx ring. | |
882 | * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7 | |
883 | * 4) user-space is either sleeping or processing block '0'. | |
884 | * 5) tpacket_rcv is currently filling block '7', since there is no space left, | |
885 | * it will close block-7,loop around and try to fill block '0'. | |
886 | * call-flow: | |
887 | * __packet_lookup_frame_in_block | |
888 | * prb_retire_current_block() | |
889 | * prb_dispatch_next_block() | |
890 | * |->(BLOCK_STATUS == USER) evaluates to true | |
891 | * 5.1) Since block-0 is currently in-use, we just freeze the queue. | |
892 | * 6) Now there are two cases: | |
893 | * 6.1) Link goes idle right after the queue is frozen. | |
894 | * But remember, the last open_block() refreshed the timer. | |
895 | * When this timer expires,it will refresh itself so that we can | |
896 | * re-open block-0 in near future. | |
897 | * 6.2) Link is busy and keeps on receiving packets. This is a simple | |
898 | * case and __packet_lookup_frame_in_block will check if block-0 | |
899 | * is free and can now be re-used. | |
900 | */ | |
eea49cc9 | 901 | static void prb_freeze_queue(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 902 | struct packet_sock *po) |
903 | { | |
904 | pkc->reset_pending_on_curr_blk = 1; | |
ee80fbf3 | 905 | po->stats.stats3.tp_freeze_q_cnt++; |
f6fb8f10 | 906 | } |
907 | ||
908 | #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT)) | |
909 | ||
910 | /* | |
911 | * If the next block is free then we will dispatch it | |
912 | * and return a good offset. | |
913 | * Else, we will freeze the queue. | |
914 | * So, caller must check the return value. | |
915 | */ | |
bc59ba39 | 916 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 917 | struct packet_sock *po) |
918 | { | |
bc59ba39 | 919 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 920 | |
921 | smp_rmb(); | |
922 | ||
923 | /* 1. Get current block num */ | |
924 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
925 | ||
926 | /* 2. If this block is currently in_use then freeze the queue */ | |
927 | if (TP_STATUS_USER & BLOCK_STATUS(pbd)) { | |
928 | prb_freeze_queue(pkc, po); | |
929 | return NULL; | |
930 | } | |
931 | ||
932 | /* | |
933 | * 3. | |
934 | * open this block and return the offset where the first packet | |
935 | * needs to get stored. | |
936 | */ | |
937 | prb_open_block(pkc, pbd); | |
938 | return (void *)pkc->nxt_offset; | |
939 | } | |
940 | ||
bc59ba39 | 941 | static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 942 | struct packet_sock *po, unsigned int status) |
943 | { | |
bc59ba39 | 944 | struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
f6fb8f10 | 945 | |
946 | /* retire/close the current block */ | |
947 | if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) { | |
948 | /* | |
949 | * Plug the case where copy_bits() is in progress on | |
950 | * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't | |
951 | * have space to copy the pkt in the current block and | |
952 | * called prb_retire_current_block() | |
953 | * | |
954 | * We don't need to worry about the TMO case because | |
955 | * the timer-handler already handled this case. | |
956 | */ | |
957 | if (!(status & TP_STATUS_BLK_TMO)) { | |
958 | while (atomic_read(&pkc->blk_fill_in_prog)) { | |
959 | /* Waiting for skb_copy_bits to finish... */ | |
960 | cpu_relax(); | |
961 | } | |
962 | } | |
963 | prb_close_block(pkc, pbd, po, status); | |
964 | return; | |
965 | } | |
f6fb8f10 | 966 | } |
967 | ||
eea49cc9 | 968 | static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc, |
bc59ba39 | 969 | struct tpacket_block_desc *pbd) |
f6fb8f10 | 970 | { |
971 | return TP_STATUS_USER & BLOCK_STATUS(pbd); | |
972 | } | |
973 | ||
eea49cc9 | 974 | static int prb_queue_frozen(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 975 | { |
976 | return pkc->reset_pending_on_curr_blk; | |
977 | } | |
978 | ||
eea49cc9 | 979 | static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb) |
f6fb8f10 | 980 | { |
bc59ba39 | 981 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
f6fb8f10 | 982 | atomic_dec(&pkc->blk_fill_in_prog); |
983 | } | |
984 | ||
eea49cc9 | 985 | static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 986 | struct tpacket3_hdr *ppd) |
987 | { | |
3958afa1 | 988 | ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb); |
f6fb8f10 | 989 | } |
990 | ||
eea49cc9 | 991 | static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 992 | struct tpacket3_hdr *ppd) |
993 | { | |
994 | ppd->hv1.tp_rxhash = 0; | |
995 | } | |
996 | ||
eea49cc9 | 997 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 998 | struct tpacket3_hdr *ppd) |
999 | { | |
df8a39de JP |
1000 | if (skb_vlan_tag_present(pkc->skb)) { |
1001 | ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb); | |
a0cdfcf3 AW |
1002 | ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto); |
1003 | ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; | |
f6fb8f10 | 1004 | } else { |
9e67030a | 1005 | ppd->hv1.tp_vlan_tci = 0; |
a0cdfcf3 | 1006 | ppd->hv1.tp_vlan_tpid = 0; |
9e67030a | 1007 | ppd->tp_status = TP_STATUS_AVAILABLE; |
f6fb8f10 | 1008 | } |
1009 | } | |
1010 | ||
bc59ba39 | 1011 | static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 1012 | struct tpacket3_hdr *ppd) |
1013 | { | |
a0cdfcf3 | 1014 | ppd->hv1.tp_padding = 0; |
f6fb8f10 | 1015 | prb_fill_vlan_info(pkc, ppd); |
1016 | ||
1017 | if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH) | |
1018 | prb_fill_rxhash(pkc, ppd); | |
1019 | else | |
1020 | prb_clear_rxhash(pkc, ppd); | |
1021 | } | |
1022 | ||
eea49cc9 | 1023 | static void prb_fill_curr_block(char *curr, |
bc59ba39 | 1024 | struct tpacket_kbdq_core *pkc, |
1025 | struct tpacket_block_desc *pbd, | |
f6fb8f10 | 1026 | unsigned int len) |
1027 | { | |
1028 | struct tpacket3_hdr *ppd; | |
1029 | ||
1030 | ppd = (struct tpacket3_hdr *)curr; | |
1031 | ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len); | |
1032 | pkc->prev = curr; | |
1033 | pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len); | |
1034 | BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len); | |
1035 | BLOCK_NUM_PKTS(pbd) += 1; | |
1036 | atomic_inc(&pkc->blk_fill_in_prog); | |
1037 | prb_run_all_ft_ops(pkc, ppd); | |
1038 | } | |
1039 | ||
1040 | /* Assumes caller has the sk->rx_queue.lock */ | |
1041 | static void *__packet_lookup_frame_in_block(struct packet_sock *po, | |
1042 | struct sk_buff *skb, | |
1043 | int status, | |
1044 | unsigned int len | |
1045 | ) | |
1046 | { | |
bc59ba39 | 1047 | struct tpacket_kbdq_core *pkc; |
1048 | struct tpacket_block_desc *pbd; | |
f6fb8f10 | 1049 | char *curr, *end; |
1050 | ||
e3192690 | 1051 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 1052 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
1053 | ||
1054 | /* Queue is frozen when user space is lagging behind */ | |
1055 | if (prb_queue_frozen(pkc)) { | |
1056 | /* | |
1057 | * Check if that last block which caused the queue to freeze, | |
1058 | * is still in_use by user-space. | |
1059 | */ | |
1060 | if (prb_curr_blk_in_use(pkc, pbd)) { | |
1061 | /* Can't record this packet */ | |
1062 | return NULL; | |
1063 | } else { | |
1064 | /* | |
1065 | * Ok, the block was released by user-space. | |
1066 | * Now let's open that block. | |
1067 | * opening a block also thaws the queue. | |
1068 | * Thawing is a side effect. | |
1069 | */ | |
1070 | prb_open_block(pkc, pbd); | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | smp_mb(); | |
1075 | curr = pkc->nxt_offset; | |
1076 | pkc->skb = skb; | |
e3192690 | 1077 | end = (char *)pbd + pkc->kblk_size; |
f6fb8f10 | 1078 | |
1079 | /* first try the current block */ | |
1080 | if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) { | |
1081 | prb_fill_curr_block(curr, pkc, pbd, len); | |
1082 | return (void *)curr; | |
1083 | } | |
1084 | ||
1085 | /* Ok, close the current block */ | |
1086 | prb_retire_current_block(pkc, po, 0); | |
1087 | ||
1088 | /* Now, try to dispatch the next block */ | |
1089 | curr = (char *)prb_dispatch_next_block(pkc, po); | |
1090 | if (curr) { | |
1091 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
1092 | prb_fill_curr_block(curr, pkc, pbd, len); | |
1093 | return (void *)curr; | |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * No free blocks are available.user_space hasn't caught up yet. | |
1098 | * Queue was just frozen and now this packet will get dropped. | |
1099 | */ | |
1100 | return NULL; | |
1101 | } | |
1102 | ||
eea49cc9 | 1103 | static void *packet_current_rx_frame(struct packet_sock *po, |
f6fb8f10 | 1104 | struct sk_buff *skb, |
1105 | int status, unsigned int len) | |
1106 | { | |
1107 | char *curr = NULL; | |
1108 | switch (po->tp_version) { | |
1109 | case TPACKET_V1: | |
1110 | case TPACKET_V2: | |
1111 | curr = packet_lookup_frame(po, &po->rx_ring, | |
1112 | po->rx_ring.head, status); | |
1113 | return curr; | |
1114 | case TPACKET_V3: | |
1115 | return __packet_lookup_frame_in_block(po, skb, status, len); | |
1116 | default: | |
1117 | WARN(1, "TPACKET version not supported\n"); | |
1118 | BUG(); | |
99aa3473 | 1119 | return NULL; |
f6fb8f10 | 1120 | } |
1121 | } | |
1122 | ||
eea49cc9 | 1123 | static void *prb_lookup_block(struct packet_sock *po, |
f6fb8f10 | 1124 | struct packet_ring_buffer *rb, |
77f65ebd | 1125 | unsigned int idx, |
f6fb8f10 | 1126 | int status) |
1127 | { | |
bc59ba39 | 1128 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
77f65ebd | 1129 | struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx); |
f6fb8f10 | 1130 | |
1131 | if (status != BLOCK_STATUS(pbd)) | |
1132 | return NULL; | |
1133 | return pbd; | |
1134 | } | |
1135 | ||
eea49cc9 | 1136 | static int prb_previous_blk_num(struct packet_ring_buffer *rb) |
f6fb8f10 | 1137 | { |
1138 | unsigned int prev; | |
1139 | if (rb->prb_bdqc.kactive_blk_num) | |
1140 | prev = rb->prb_bdqc.kactive_blk_num-1; | |
1141 | else | |
1142 | prev = rb->prb_bdqc.knum_blocks-1; | |
1143 | return prev; | |
1144 | } | |
1145 | ||
1146 | /* Assumes caller has held the rx_queue.lock */ | |
eea49cc9 | 1147 | static void *__prb_previous_block(struct packet_sock *po, |
f6fb8f10 | 1148 | struct packet_ring_buffer *rb, |
1149 | int status) | |
1150 | { | |
1151 | unsigned int previous = prb_previous_blk_num(rb); | |
1152 | return prb_lookup_block(po, rb, previous, status); | |
1153 | } | |
1154 | ||
eea49cc9 | 1155 | static void *packet_previous_rx_frame(struct packet_sock *po, |
f6fb8f10 | 1156 | struct packet_ring_buffer *rb, |
1157 | int status) | |
1158 | { | |
1159 | if (po->tp_version <= TPACKET_V2) | |
1160 | return packet_previous_frame(po, rb, status); | |
1161 | ||
1162 | return __prb_previous_block(po, rb, status); | |
1163 | } | |
1164 | ||
eea49cc9 | 1165 | static void packet_increment_rx_head(struct packet_sock *po, |
f6fb8f10 | 1166 | struct packet_ring_buffer *rb) |
1167 | { | |
1168 | switch (po->tp_version) { | |
1169 | case TPACKET_V1: | |
1170 | case TPACKET_V2: | |
1171 | return packet_increment_head(rb); | |
1172 | case TPACKET_V3: | |
1173 | default: | |
1174 | WARN(1, "TPACKET version not supported.\n"); | |
1175 | BUG(); | |
1176 | return; | |
1177 | } | |
1178 | } | |
1179 | ||
eea49cc9 | 1180 | static void *packet_previous_frame(struct packet_sock *po, |
69e3c75f JB |
1181 | struct packet_ring_buffer *rb, |
1182 | int status) | |
1183 | { | |
1184 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
1185 | return packet_lookup_frame(po, rb, previous, status); | |
1186 | } | |
1187 | ||
eea49cc9 | 1188 | static void packet_increment_head(struct packet_ring_buffer *buff) |
69e3c75f JB |
1189 | { |
1190 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
1191 | } | |
1192 | ||
b0138408 DB |
1193 | static void packet_inc_pending(struct packet_ring_buffer *rb) |
1194 | { | |
1195 | this_cpu_inc(*rb->pending_refcnt); | |
1196 | } | |
1197 | ||
1198 | static void packet_dec_pending(struct packet_ring_buffer *rb) | |
1199 | { | |
1200 | this_cpu_dec(*rb->pending_refcnt); | |
1201 | } | |
1202 | ||
1203 | static unsigned int packet_read_pending(const struct packet_ring_buffer *rb) | |
1204 | { | |
1205 | unsigned int refcnt = 0; | |
1206 | int cpu; | |
1207 | ||
1208 | /* We don't use pending refcount in rx_ring. */ | |
1209 | if (rb->pending_refcnt == NULL) | |
1210 | return 0; | |
1211 | ||
1212 | for_each_possible_cpu(cpu) | |
1213 | refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu); | |
1214 | ||
1215 | return refcnt; | |
1216 | } | |
1217 | ||
1218 | static int packet_alloc_pending(struct packet_sock *po) | |
1219 | { | |
1220 | po->rx_ring.pending_refcnt = NULL; | |
1221 | ||
1222 | po->tx_ring.pending_refcnt = alloc_percpu(unsigned int); | |
1223 | if (unlikely(po->tx_ring.pending_refcnt == NULL)) | |
1224 | return -ENOBUFS; | |
1225 | ||
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | static void packet_free_pending(struct packet_sock *po) | |
1230 | { | |
1231 | free_percpu(po->tx_ring.pending_refcnt); | |
1232 | } | |
1233 | ||
9954729b WB |
1234 | #define ROOM_POW_OFF 2 |
1235 | #define ROOM_NONE 0x0 | |
1236 | #define ROOM_LOW 0x1 | |
1237 | #define ROOM_NORMAL 0x2 | |
1238 | ||
1239 | static bool __tpacket_has_room(struct packet_sock *po, int pow_off) | |
77f65ebd | 1240 | { |
9954729b WB |
1241 | int idx, len; |
1242 | ||
1243 | len = po->rx_ring.frame_max + 1; | |
1244 | idx = po->rx_ring.head; | |
1245 | if (pow_off) | |
1246 | idx += len >> pow_off; | |
1247 | if (idx >= len) | |
1248 | idx -= len; | |
1249 | return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL); | |
1250 | } | |
1251 | ||
1252 | static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off) | |
1253 | { | |
1254 | int idx, len; | |
1255 | ||
1256 | len = po->rx_ring.prb_bdqc.knum_blocks; | |
1257 | idx = po->rx_ring.prb_bdqc.kactive_blk_num; | |
1258 | if (pow_off) | |
1259 | idx += len >> pow_off; | |
1260 | if (idx >= len) | |
1261 | idx -= len; | |
1262 | return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL); | |
1263 | } | |
77f65ebd | 1264 | |
2ccdbaa6 | 1265 | static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) |
9954729b WB |
1266 | { |
1267 | struct sock *sk = &po->sk; | |
1268 | int ret = ROOM_NONE; | |
1269 | ||
1270 | if (po->prot_hook.func != tpacket_rcv) { | |
1271 | int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc) | |
2ccdbaa6 | 1272 | - (skb ? skb->truesize : 0); |
9954729b WB |
1273 | if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF)) |
1274 | return ROOM_NORMAL; | |
1275 | else if (avail > 0) | |
1276 | return ROOM_LOW; | |
1277 | else | |
1278 | return ROOM_NONE; | |
1279 | } | |
77f65ebd | 1280 | |
9954729b WB |
1281 | if (po->tp_version == TPACKET_V3) { |
1282 | if (__tpacket_v3_has_room(po, ROOM_POW_OFF)) | |
1283 | ret = ROOM_NORMAL; | |
1284 | else if (__tpacket_v3_has_room(po, 0)) | |
1285 | ret = ROOM_LOW; | |
1286 | } else { | |
1287 | if (__tpacket_has_room(po, ROOM_POW_OFF)) | |
1288 | ret = ROOM_NORMAL; | |
1289 | else if (__tpacket_has_room(po, 0)) | |
1290 | ret = ROOM_LOW; | |
1291 | } | |
2ccdbaa6 WB |
1292 | |
1293 | return ret; | |
1294 | } | |
1295 | ||
1296 | static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) | |
1297 | { | |
1298 | int ret; | |
1299 | bool has_room; | |
1300 | ||
54d7c01d WB |
1301 | spin_lock_bh(&po->sk.sk_receive_queue.lock); |
1302 | ret = __packet_rcv_has_room(po, skb); | |
2ccdbaa6 WB |
1303 | has_room = ret == ROOM_NORMAL; |
1304 | if (po->pressure == has_room) | |
54d7c01d WB |
1305 | po->pressure = !has_room; |
1306 | spin_unlock_bh(&po->sk.sk_receive_queue.lock); | |
77f65ebd | 1307 | |
9954729b | 1308 | return ret; |
77f65ebd WB |
1309 | } |
1310 | ||
1da177e4 LT |
1311 | static void packet_sock_destruct(struct sock *sk) |
1312 | { | |
ed85b565 RC |
1313 | skb_queue_purge(&sk->sk_error_queue); |
1314 | ||
547b792c IJ |
1315 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
1316 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
1da177e4 LT |
1317 | |
1318 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 1319 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
1320 | return; |
1321 | } | |
1322 | ||
17ab56a2 | 1323 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
1324 | } |
1325 | ||
3b3a5b0a WB |
1326 | static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb) |
1327 | { | |
1328 | u32 rxhash; | |
1329 | int i, count = 0; | |
1330 | ||
1331 | rxhash = skb_get_hash(skb); | |
1332 | for (i = 0; i < ROLLOVER_HLEN; i++) | |
1333 | if (po->rollover->history[i] == rxhash) | |
1334 | count++; | |
1335 | ||
1336 | po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash; | |
1337 | return count > (ROLLOVER_HLEN >> 1); | |
1338 | } | |
1339 | ||
77f65ebd WB |
1340 | static unsigned int fanout_demux_hash(struct packet_fanout *f, |
1341 | struct sk_buff *skb, | |
1342 | unsigned int num) | |
dc99f600 | 1343 | { |
61b905da | 1344 | return reciprocal_scale(skb_get_hash(skb), num); |
dc99f600 DM |
1345 | } |
1346 | ||
77f65ebd WB |
1347 | static unsigned int fanout_demux_lb(struct packet_fanout *f, |
1348 | struct sk_buff *skb, | |
1349 | unsigned int num) | |
dc99f600 | 1350 | { |
468479e6 | 1351 | unsigned int val = atomic_inc_return(&f->rr_cur); |
dc99f600 | 1352 | |
468479e6 | 1353 | return val % num; |
77f65ebd WB |
1354 | } |
1355 | ||
1356 | static unsigned int fanout_demux_cpu(struct packet_fanout *f, | |
1357 | struct sk_buff *skb, | |
1358 | unsigned int num) | |
1359 | { | |
1360 | return smp_processor_id() % num; | |
dc99f600 DM |
1361 | } |
1362 | ||
5df0ddfb DB |
1363 | static unsigned int fanout_demux_rnd(struct packet_fanout *f, |
1364 | struct sk_buff *skb, | |
1365 | unsigned int num) | |
1366 | { | |
f337db64 | 1367 | return prandom_u32_max(num); |
5df0ddfb DB |
1368 | } |
1369 | ||
77f65ebd WB |
1370 | static unsigned int fanout_demux_rollover(struct packet_fanout *f, |
1371 | struct sk_buff *skb, | |
ad377cab | 1372 | unsigned int idx, bool try_self, |
77f65ebd | 1373 | unsigned int num) |
95ec3eb4 | 1374 | { |
4633c9e0 | 1375 | struct packet_sock *po, *po_next, *po_skip = NULL; |
a9b63918 | 1376 | unsigned int i, j, room = ROOM_NONE; |
95ec3eb4 | 1377 | |
0648ab70 | 1378 | po = pkt_sk(f->arr[idx]); |
3b3a5b0a WB |
1379 | |
1380 | if (try_self) { | |
1381 | room = packet_rcv_has_room(po, skb); | |
1382 | if (room == ROOM_NORMAL || | |
1383 | (room == ROOM_LOW && !fanout_flow_is_huge(po, skb))) | |
1384 | return idx; | |
4633c9e0 | 1385 | po_skip = po; |
3b3a5b0a | 1386 | } |
ad377cab | 1387 | |
0648ab70 | 1388 | i = j = min_t(int, po->rollover->sock, num - 1); |
77f65ebd | 1389 | do { |
2ccdbaa6 | 1390 | po_next = pkt_sk(f->arr[i]); |
4633c9e0 | 1391 | if (po_next != po_skip && !po_next->pressure && |
2ccdbaa6 | 1392 | packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) { |
77f65ebd | 1393 | if (i != j) |
0648ab70 | 1394 | po->rollover->sock = i; |
a9b63918 WB |
1395 | atomic_long_inc(&po->rollover->num); |
1396 | if (room == ROOM_LOW) | |
1397 | atomic_long_inc(&po->rollover->num_huge); | |
77f65ebd WB |
1398 | return i; |
1399 | } | |
ad377cab | 1400 | |
77f65ebd WB |
1401 | if (++i == num) |
1402 | i = 0; | |
1403 | } while (i != j); | |
1404 | ||
a9b63918 | 1405 | atomic_long_inc(&po->rollover->num_failed); |
77f65ebd WB |
1406 | return idx; |
1407 | } | |
1408 | ||
2d36097d NH |
1409 | static unsigned int fanout_demux_qm(struct packet_fanout *f, |
1410 | struct sk_buff *skb, | |
1411 | unsigned int num) | |
1412 | { | |
1413 | return skb_get_queue_mapping(skb) % num; | |
1414 | } | |
1415 | ||
47dceb8e WB |
1416 | static unsigned int fanout_demux_bpf(struct packet_fanout *f, |
1417 | struct sk_buff *skb, | |
1418 | unsigned int num) | |
1419 | { | |
1420 | struct bpf_prog *prog; | |
1421 | unsigned int ret = 0; | |
1422 | ||
1423 | rcu_read_lock(); | |
1424 | prog = rcu_dereference(f->bpf_prog); | |
1425 | if (prog) | |
ff936a04 | 1426 | ret = bpf_prog_run_clear_cb(prog, skb) % num; |
47dceb8e WB |
1427 | rcu_read_unlock(); |
1428 | ||
1429 | return ret; | |
1430 | } | |
1431 | ||
77f65ebd WB |
1432 | static bool fanout_has_flag(struct packet_fanout *f, u16 flag) |
1433 | { | |
1434 | return f->flags & (flag >> 8); | |
95ec3eb4 DM |
1435 | } |
1436 | ||
95ec3eb4 DM |
1437 | static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, |
1438 | struct packet_type *pt, struct net_device *orig_dev) | |
dc99f600 DM |
1439 | { |
1440 | struct packet_fanout *f = pt->af_packet_priv; | |
f98f4514 | 1441 | unsigned int num = READ_ONCE(f->num_members); |
19bcf9f2 | 1442 | struct net *net = read_pnet(&f->net); |
dc99f600 | 1443 | struct packet_sock *po; |
77f65ebd | 1444 | unsigned int idx; |
dc99f600 | 1445 | |
19bcf9f2 | 1446 | if (!net_eq(dev_net(dev), net) || !num) { |
dc99f600 DM |
1447 | kfree_skb(skb); |
1448 | return 0; | |
1449 | } | |
1450 | ||
3f34b24a | 1451 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) { |
19bcf9f2 | 1452 | skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET); |
3f34b24a AD |
1453 | if (!skb) |
1454 | return 0; | |
1455 | } | |
95ec3eb4 DM |
1456 | switch (f->type) { |
1457 | case PACKET_FANOUT_HASH: | |
1458 | default: | |
77f65ebd | 1459 | idx = fanout_demux_hash(f, skb, num); |
95ec3eb4 DM |
1460 | break; |
1461 | case PACKET_FANOUT_LB: | |
77f65ebd | 1462 | idx = fanout_demux_lb(f, skb, num); |
95ec3eb4 DM |
1463 | break; |
1464 | case PACKET_FANOUT_CPU: | |
77f65ebd WB |
1465 | idx = fanout_demux_cpu(f, skb, num); |
1466 | break; | |
5df0ddfb DB |
1467 | case PACKET_FANOUT_RND: |
1468 | idx = fanout_demux_rnd(f, skb, num); | |
1469 | break; | |
2d36097d NH |
1470 | case PACKET_FANOUT_QM: |
1471 | idx = fanout_demux_qm(f, skb, num); | |
1472 | break; | |
77f65ebd | 1473 | case PACKET_FANOUT_ROLLOVER: |
ad377cab | 1474 | idx = fanout_demux_rollover(f, skb, 0, false, num); |
95ec3eb4 | 1475 | break; |
47dceb8e | 1476 | case PACKET_FANOUT_CBPF: |
f2e52095 | 1477 | case PACKET_FANOUT_EBPF: |
47dceb8e WB |
1478 | idx = fanout_demux_bpf(f, skb, num); |
1479 | break; | |
dc99f600 DM |
1480 | } |
1481 | ||
ad377cab WB |
1482 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER)) |
1483 | idx = fanout_demux_rollover(f, skb, idx, true, num); | |
dc99f600 | 1484 | |
ad377cab | 1485 | po = pkt_sk(f->arr[idx]); |
dc99f600 DM |
1486 | return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev); |
1487 | } | |
1488 | ||
fff3321d PE |
1489 | DEFINE_MUTEX(fanout_mutex); |
1490 | EXPORT_SYMBOL_GPL(fanout_mutex); | |
dc99f600 DM |
1491 | static LIST_HEAD(fanout_list); |
1492 | ||
1493 | static void __fanout_link(struct sock *sk, struct packet_sock *po) | |
1494 | { | |
1495 | struct packet_fanout *f = po->fanout; | |
1496 | ||
1497 | spin_lock(&f->lock); | |
1498 | f->arr[f->num_members] = sk; | |
1499 | smp_wmb(); | |
1500 | f->num_members++; | |
1501 | spin_unlock(&f->lock); | |
1502 | } | |
1503 | ||
1504 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po) | |
1505 | { | |
1506 | struct packet_fanout *f = po->fanout; | |
1507 | int i; | |
1508 | ||
1509 | spin_lock(&f->lock); | |
1510 | for (i = 0; i < f->num_members; i++) { | |
1511 | if (f->arr[i] == sk) | |
1512 | break; | |
1513 | } | |
1514 | BUG_ON(i >= f->num_members); | |
1515 | f->arr[i] = f->arr[f->num_members - 1]; | |
1516 | f->num_members--; | |
1517 | spin_unlock(&f->lock); | |
1518 | } | |
1519 | ||
d4dd8aee | 1520 | static bool match_fanout_group(struct packet_type *ptype, struct sock *sk) |
c0de08d0 | 1521 | { |
161642e2 ED |
1522 | if (sk->sk_family != PF_PACKET) |
1523 | return false; | |
c0de08d0 | 1524 | |
161642e2 | 1525 | return ptype->af_packet_priv == pkt_sk(sk)->fanout; |
c0de08d0 EL |
1526 | } |
1527 | ||
47dceb8e WB |
1528 | static void fanout_init_data(struct packet_fanout *f) |
1529 | { | |
1530 | switch (f->type) { | |
1531 | case PACKET_FANOUT_LB: | |
1532 | atomic_set(&f->rr_cur, 0); | |
1533 | break; | |
1534 | case PACKET_FANOUT_CBPF: | |
f2e52095 | 1535 | case PACKET_FANOUT_EBPF: |
47dceb8e WB |
1536 | RCU_INIT_POINTER(f->bpf_prog, NULL); |
1537 | break; | |
1538 | } | |
1539 | } | |
1540 | ||
1541 | static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new) | |
1542 | { | |
1543 | struct bpf_prog *old; | |
1544 | ||
1545 | spin_lock(&f->lock); | |
1546 | old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock)); | |
1547 | rcu_assign_pointer(f->bpf_prog, new); | |
1548 | spin_unlock(&f->lock); | |
1549 | ||
1550 | if (old) { | |
1551 | synchronize_net(); | |
1552 | bpf_prog_destroy(old); | |
1553 | } | |
1554 | } | |
1555 | ||
1556 | static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data, | |
1557 | unsigned int len) | |
1558 | { | |
1559 | struct bpf_prog *new; | |
1560 | struct sock_fprog fprog; | |
1561 | int ret; | |
1562 | ||
1563 | if (sock_flag(&po->sk, SOCK_FILTER_LOCKED)) | |
1564 | return -EPERM; | |
1565 | if (len != sizeof(fprog)) | |
1566 | return -EINVAL; | |
1567 | if (copy_from_user(&fprog, data, len)) | |
1568 | return -EFAULT; | |
1569 | ||
bab18991 | 1570 | ret = bpf_prog_create_from_user(&new, &fprog, NULL, false); |
47dceb8e WB |
1571 | if (ret) |
1572 | return ret; | |
1573 | ||
1574 | __fanout_set_data_bpf(po->fanout, new); | |
1575 | return 0; | |
1576 | } | |
1577 | ||
f2e52095 WB |
1578 | static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data, |
1579 | unsigned int len) | |
1580 | { | |
1581 | struct bpf_prog *new; | |
1582 | u32 fd; | |
1583 | ||
1584 | if (sock_flag(&po->sk, SOCK_FILTER_LOCKED)) | |
1585 | return -EPERM; | |
1586 | if (len != sizeof(fd)) | |
1587 | return -EINVAL; | |
1588 | if (copy_from_user(&fd, data, len)) | |
1589 | return -EFAULT; | |
1590 | ||
1591 | new = bpf_prog_get(fd); | |
1592 | if (IS_ERR(new)) | |
1593 | return PTR_ERR(new); | |
1594 | if (new->type != BPF_PROG_TYPE_SOCKET_FILTER) { | |
1595 | bpf_prog_put(new); | |
1596 | return -EINVAL; | |
1597 | } | |
1598 | ||
1599 | __fanout_set_data_bpf(po->fanout, new); | |
1600 | return 0; | |
1601 | } | |
1602 | ||
47dceb8e WB |
1603 | static int fanout_set_data(struct packet_sock *po, char __user *data, |
1604 | unsigned int len) | |
1605 | { | |
1606 | switch (po->fanout->type) { | |
1607 | case PACKET_FANOUT_CBPF: | |
1608 | return fanout_set_data_cbpf(po, data, len); | |
f2e52095 WB |
1609 | case PACKET_FANOUT_EBPF: |
1610 | return fanout_set_data_ebpf(po, data, len); | |
47dceb8e WB |
1611 | default: |
1612 | return -EINVAL; | |
1613 | }; | |
1614 | } | |
1615 | ||
1616 | static void fanout_release_data(struct packet_fanout *f) | |
1617 | { | |
1618 | switch (f->type) { | |
1619 | case PACKET_FANOUT_CBPF: | |
f2e52095 | 1620 | case PACKET_FANOUT_EBPF: |
47dceb8e WB |
1621 | __fanout_set_data_bpf(f, NULL); |
1622 | }; | |
1623 | } | |
1624 | ||
7736d33f | 1625 | static int fanout_add(struct sock *sk, u16 id, u16 type_flags) |
dc99f600 DM |
1626 | { |
1627 | struct packet_sock *po = pkt_sk(sk); | |
1628 | struct packet_fanout *f, *match; | |
7736d33f | 1629 | u8 type = type_flags & 0xff; |
77f65ebd | 1630 | u8 flags = type_flags >> 8; |
dc99f600 DM |
1631 | int err; |
1632 | ||
1633 | switch (type) { | |
77f65ebd WB |
1634 | case PACKET_FANOUT_ROLLOVER: |
1635 | if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER) | |
1636 | return -EINVAL; | |
dc99f600 DM |
1637 | case PACKET_FANOUT_HASH: |
1638 | case PACKET_FANOUT_LB: | |
95ec3eb4 | 1639 | case PACKET_FANOUT_CPU: |
5df0ddfb | 1640 | case PACKET_FANOUT_RND: |
2d36097d | 1641 | case PACKET_FANOUT_QM: |
47dceb8e | 1642 | case PACKET_FANOUT_CBPF: |
f2e52095 | 1643 | case PACKET_FANOUT_EBPF: |
dc99f600 DM |
1644 | break; |
1645 | default: | |
1646 | return -EINVAL; | |
1647 | } | |
1648 | ||
1649 | if (!po->running) | |
1650 | return -EINVAL; | |
1651 | ||
1652 | if (po->fanout) | |
1653 | return -EALREADY; | |
1654 | ||
4633c9e0 WB |
1655 | if (type == PACKET_FANOUT_ROLLOVER || |
1656 | (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) { | |
0648ab70 WB |
1657 | po->rollover = kzalloc(sizeof(*po->rollover), GFP_KERNEL); |
1658 | if (!po->rollover) | |
1659 | return -ENOMEM; | |
a9b63918 WB |
1660 | atomic_long_set(&po->rollover->num, 0); |
1661 | atomic_long_set(&po->rollover->num_huge, 0); | |
1662 | atomic_long_set(&po->rollover->num_failed, 0); | |
0648ab70 WB |
1663 | } |
1664 | ||
dc99f600 DM |
1665 | mutex_lock(&fanout_mutex); |
1666 | match = NULL; | |
1667 | list_for_each_entry(f, &fanout_list, list) { | |
1668 | if (f->id == id && | |
1669 | read_pnet(&f->net) == sock_net(sk)) { | |
1670 | match = f; | |
1671 | break; | |
1672 | } | |
1673 | } | |
afe62c68 | 1674 | err = -EINVAL; |
77f65ebd | 1675 | if (match && match->flags != flags) |
afe62c68 | 1676 | goto out; |
dc99f600 | 1677 | if (!match) { |
afe62c68 | 1678 | err = -ENOMEM; |
dc99f600 | 1679 | match = kzalloc(sizeof(*match), GFP_KERNEL); |
afe62c68 ED |
1680 | if (!match) |
1681 | goto out; | |
1682 | write_pnet(&match->net, sock_net(sk)); | |
1683 | match->id = id; | |
1684 | match->type = type; | |
77f65ebd | 1685 | match->flags = flags; |
afe62c68 ED |
1686 | INIT_LIST_HEAD(&match->list); |
1687 | spin_lock_init(&match->lock); | |
1688 | atomic_set(&match->sk_ref, 0); | |
47dceb8e | 1689 | fanout_init_data(match); |
afe62c68 ED |
1690 | match->prot_hook.type = po->prot_hook.type; |
1691 | match->prot_hook.dev = po->prot_hook.dev; | |
1692 | match->prot_hook.func = packet_rcv_fanout; | |
1693 | match->prot_hook.af_packet_priv = match; | |
c0de08d0 | 1694 | match->prot_hook.id_match = match_fanout_group; |
afe62c68 ED |
1695 | dev_add_pack(&match->prot_hook); |
1696 | list_add(&match->list, &fanout_list); | |
dc99f600 | 1697 | } |
afe62c68 ED |
1698 | err = -EINVAL; |
1699 | if (match->type == type && | |
1700 | match->prot_hook.type == po->prot_hook.type && | |
1701 | match->prot_hook.dev == po->prot_hook.dev) { | |
1702 | err = -ENOSPC; | |
1703 | if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) { | |
1704 | __dev_remove_pack(&po->prot_hook); | |
1705 | po->fanout = match; | |
1706 | atomic_inc(&match->sk_ref); | |
1707 | __fanout_link(sk, po); | |
1708 | err = 0; | |
dc99f600 DM |
1709 | } |
1710 | } | |
afe62c68 | 1711 | out: |
dc99f600 | 1712 | mutex_unlock(&fanout_mutex); |
0648ab70 WB |
1713 | if (err) { |
1714 | kfree(po->rollover); | |
1715 | po->rollover = NULL; | |
1716 | } | |
dc99f600 DM |
1717 | return err; |
1718 | } | |
1719 | ||
1720 | static void fanout_release(struct sock *sk) | |
1721 | { | |
1722 | struct packet_sock *po = pkt_sk(sk); | |
1723 | struct packet_fanout *f; | |
1724 | ||
1725 | f = po->fanout; | |
1726 | if (!f) | |
1727 | return; | |
1728 | ||
fff3321d | 1729 | mutex_lock(&fanout_mutex); |
dc99f600 DM |
1730 | po->fanout = NULL; |
1731 | ||
dc99f600 DM |
1732 | if (atomic_dec_and_test(&f->sk_ref)) { |
1733 | list_del(&f->list); | |
1734 | dev_remove_pack(&f->prot_hook); | |
47dceb8e | 1735 | fanout_release_data(f); |
dc99f600 DM |
1736 | kfree(f); |
1737 | } | |
1738 | mutex_unlock(&fanout_mutex); | |
0648ab70 | 1739 | |
59f21118 WB |
1740 | if (po->rollover) |
1741 | kfree_rcu(po->rollover, rcu); | |
dc99f600 | 1742 | } |
1da177e4 | 1743 | |
3c70c132 DB |
1744 | static bool packet_extra_vlan_len_allowed(const struct net_device *dev, |
1745 | struct sk_buff *skb) | |
1746 | { | |
1747 | /* Earlier code assumed this would be a VLAN pkt, double-check | |
1748 | * this now that we have the actual packet in hand. We can only | |
1749 | * do this check on Ethernet devices. | |
1750 | */ | |
1751 | if (unlikely(dev->type != ARPHRD_ETHER)) | |
1752 | return false; | |
1753 | ||
1754 | skb_reset_mac_header(skb); | |
1755 | return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q)); | |
1756 | } | |
1757 | ||
90ddc4f0 | 1758 | static const struct proto_ops packet_ops; |
1da177e4 | 1759 | |
90ddc4f0 | 1760 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 1761 | |
40d4e3df ED |
1762 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
1763 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
1764 | { |
1765 | struct sock *sk; | |
1766 | struct sockaddr_pkt *spkt; | |
1767 | ||
1768 | /* | |
1769 | * When we registered the protocol we saved the socket in the data | |
1770 | * field for just this event. | |
1771 | */ | |
1772 | ||
1773 | sk = pt->af_packet_priv; | |
1ce4f28b | 1774 | |
1da177e4 LT |
1775 | /* |
1776 | * Yank back the headers [hope the device set this | |
1777 | * right or kerboom...] | |
1778 | * | |
1779 | * Incoming packets have ll header pulled, | |
1780 | * push it back. | |
1781 | * | |
98e399f8 | 1782 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
1783 | * so that this procedure is noop. |
1784 | */ | |
1785 | ||
1786 | if (skb->pkt_type == PACKET_LOOPBACK) | |
1787 | goto out; | |
1788 | ||
09ad9bc7 | 1789 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
1790 | goto out; |
1791 | ||
40d4e3df ED |
1792 | skb = skb_share_check(skb, GFP_ATOMIC); |
1793 | if (skb == NULL) | |
1da177e4 LT |
1794 | goto oom; |
1795 | ||
1796 | /* drop any routing info */ | |
adf30907 | 1797 | skb_dst_drop(skb); |
1da177e4 | 1798 | |
84531c24 PO |
1799 | /* drop conntrack reference */ |
1800 | nf_reset(skb); | |
1801 | ||
ffbc6111 | 1802 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 1803 | |
98e399f8 | 1804 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
1805 | |
1806 | /* | |
1807 | * The SOCK_PACKET socket receives _all_ frames. | |
1808 | */ | |
1809 | ||
1810 | spkt->spkt_family = dev->type; | |
1811 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
1812 | spkt->spkt_protocol = skb->protocol; | |
1813 | ||
1814 | /* | |
1815 | * Charge the memory to the socket. This is done specifically | |
1816 | * to prevent sockets using all the memory up. | |
1817 | */ | |
1818 | ||
40d4e3df | 1819 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
1820 | return 0; |
1821 | ||
1822 | out: | |
1823 | kfree_skb(skb); | |
1824 | oom: | |
1825 | return 0; | |
1826 | } | |
1827 | ||
1828 | ||
1829 | /* | |
1830 | * Output a raw packet to a device layer. This bypasses all the other | |
1831 | * protocol layers and you must therefore supply it with a complete frame | |
1832 | */ | |
1ce4f28b | 1833 | |
1b784140 YX |
1834 | static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg, |
1835 | size_t len) | |
1da177e4 LT |
1836 | { |
1837 | struct sock *sk = sock->sk; | |
342dfc30 | 1838 | DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name); |
1a35ca80 | 1839 | struct sk_buff *skb = NULL; |
1da177e4 | 1840 | struct net_device *dev; |
40d4e3df | 1841 | __be16 proto = 0; |
1da177e4 | 1842 | int err; |
3bdc0eba | 1843 | int extra_len = 0; |
1ce4f28b | 1844 | |
1da177e4 | 1845 | /* |
1ce4f28b | 1846 | * Get and verify the address. |
1da177e4 LT |
1847 | */ |
1848 | ||
40d4e3df | 1849 | if (saddr) { |
1da177e4 | 1850 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
1851 | return -EINVAL; |
1852 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
1853 | proto = saddr->spkt_protocol; | |
1854 | } else | |
1855 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
1856 | |
1857 | /* | |
1ce4f28b | 1858 | * Find the device first to size check it |
1da177e4 LT |
1859 | */ |
1860 | ||
de74e92a | 1861 | saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0; |
1a35ca80 | 1862 | retry: |
654d1f8a ED |
1863 | rcu_read_lock(); |
1864 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
1865 | err = -ENODEV; |
1866 | if (dev == NULL) | |
1867 | goto out_unlock; | |
1ce4f28b | 1868 | |
d5e76b0a DM |
1869 | err = -ENETDOWN; |
1870 | if (!(dev->flags & IFF_UP)) | |
1871 | goto out_unlock; | |
1872 | ||
1da177e4 | 1873 | /* |
40d4e3df ED |
1874 | * You may not queue a frame bigger than the mtu. This is the lowest level |
1875 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 1876 | */ |
1ce4f28b | 1877 | |
3bdc0eba BG |
1878 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
1879 | if (!netif_supports_nofcs(dev)) { | |
1880 | err = -EPROTONOSUPPORT; | |
1881 | goto out_unlock; | |
1882 | } | |
1883 | extra_len = 4; /* We're doing our own CRC */ | |
1884 | } | |
1885 | ||
1da177e4 | 1886 | err = -EMSGSIZE; |
3bdc0eba | 1887 | if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len) |
1da177e4 LT |
1888 | goto out_unlock; |
1889 | ||
1a35ca80 ED |
1890 | if (!skb) { |
1891 | size_t reserved = LL_RESERVED_SPACE(dev); | |
4ce40912 | 1892 | int tlen = dev->needed_tailroom; |
1a35ca80 ED |
1893 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; |
1894 | ||
1895 | rcu_read_unlock(); | |
4ce40912 | 1896 | skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL); |
1a35ca80 ED |
1897 | if (skb == NULL) |
1898 | return -ENOBUFS; | |
1899 | /* FIXME: Save some space for broken drivers that write a hard | |
1900 | * header at transmission time by themselves. PPP is the notable | |
1901 | * one here. This should really be fixed at the driver level. | |
1902 | */ | |
1903 | skb_reserve(skb, reserved); | |
1904 | skb_reset_network_header(skb); | |
1905 | ||
1906 | /* Try to align data part correctly */ | |
1907 | if (hhlen) { | |
1908 | skb->data -= hhlen; | |
1909 | skb->tail -= hhlen; | |
1910 | if (len < hhlen) | |
1911 | skb_reset_network_header(skb); | |
1912 | } | |
6ce8e9ce | 1913 | err = memcpy_from_msg(skb_put(skb, len), msg, len); |
1a35ca80 ED |
1914 | if (err) |
1915 | goto out_free; | |
1916 | goto retry; | |
1da177e4 LT |
1917 | } |
1918 | ||
3c70c132 DB |
1919 | if (len > (dev->mtu + dev->hard_header_len + extra_len) && |
1920 | !packet_extra_vlan_len_allowed(dev, skb)) { | |
1921 | err = -EMSGSIZE; | |
1922 | goto out_unlock; | |
57f89bfa | 1923 | } |
1a35ca80 | 1924 | |
1da177e4 LT |
1925 | skb->protocol = proto; |
1926 | skb->dev = dev; | |
1927 | skb->priority = sk->sk_priority; | |
2d37a186 | 1928 | skb->mark = sk->sk_mark; |
bf84a010 DB |
1929 | |
1930 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); | |
1da177e4 | 1931 | |
3bdc0eba BG |
1932 | if (unlikely(extra_len == 4)) |
1933 | skb->no_fcs = 1; | |
1934 | ||
40893fd0 | 1935 | skb_probe_transport_header(skb, 0); |
c1aad275 | 1936 | |
1da177e4 | 1937 | dev_queue_xmit(skb); |
654d1f8a | 1938 | rcu_read_unlock(); |
40d4e3df | 1939 | return len; |
1da177e4 | 1940 | |
1da177e4 | 1941 | out_unlock: |
654d1f8a | 1942 | rcu_read_unlock(); |
1a35ca80 ED |
1943 | out_free: |
1944 | kfree_skb(skb); | |
1da177e4 LT |
1945 | return err; |
1946 | } | |
1da177e4 | 1947 | |
ff936a04 AS |
1948 | static unsigned int run_filter(struct sk_buff *skb, |
1949 | const struct sock *sk, | |
1950 | unsigned int res) | |
1da177e4 LT |
1951 | { |
1952 | struct sk_filter *filter; | |
fda9ef5d | 1953 | |
80f8f102 ED |
1954 | rcu_read_lock(); |
1955 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 | 1956 | if (filter != NULL) |
ff936a04 | 1957 | res = bpf_prog_run_clear_cb(filter->prog, skb); |
80f8f102 | 1958 | rcu_read_unlock(); |
1da177e4 | 1959 | |
dbcb5855 | 1960 | return res; |
1da177e4 LT |
1961 | } |
1962 | ||
1963 | /* | |
62ab0812 ED |
1964 | * This function makes lazy skb cloning in hope that most of packets |
1965 | * are discarded by BPF. | |
1966 | * | |
1967 | * Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
1968 | * and skb->cb are mangled. It works because (and until) packets | |
1969 | * falling here are owned by current CPU. Output packets are cloned | |
1970 | * by dev_queue_xmit_nit(), input packets are processed by net_bh | |
1971 | * sequencially, so that if we return skb to original state on exit, | |
1972 | * we will not harm anyone. | |
1da177e4 LT |
1973 | */ |
1974 | ||
40d4e3df ED |
1975 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
1976 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
1977 | { |
1978 | struct sock *sk; | |
1979 | struct sockaddr_ll *sll; | |
1980 | struct packet_sock *po; | |
40d4e3df | 1981 | u8 *skb_head = skb->data; |
1da177e4 | 1982 | int skb_len = skb->len; |
dbcb5855 | 1983 | unsigned int snaplen, res; |
1da177e4 LT |
1984 | |
1985 | if (skb->pkt_type == PACKET_LOOPBACK) | |
1986 | goto drop; | |
1987 | ||
1988 | sk = pt->af_packet_priv; | |
1989 | po = pkt_sk(sk); | |
1990 | ||
09ad9bc7 | 1991 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
1992 | goto drop; |
1993 | ||
1da177e4 LT |
1994 | skb->dev = dev; |
1995 | ||
3b04ddde | 1996 | if (dev->header_ops) { |
1da177e4 | 1997 | /* The device has an explicit notion of ll header, |
62ab0812 ED |
1998 | * exported to higher levels. |
1999 | * | |
2000 | * Otherwise, the device hides details of its frame | |
2001 | * structure, so that corresponding packet head is | |
2002 | * never delivered to user. | |
1da177e4 LT |
2003 | */ |
2004 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 2005 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
2006 | else if (skb->pkt_type == PACKET_OUTGOING) { |
2007 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 2008 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
2009 | } |
2010 | } | |
2011 | ||
2012 | snaplen = skb->len; | |
2013 | ||
dbcb5855 DM |
2014 | res = run_filter(skb, sk, snaplen); |
2015 | if (!res) | |
fda9ef5d | 2016 | goto drop_n_restore; |
dbcb5855 DM |
2017 | if (snaplen > res) |
2018 | snaplen = res; | |
1da177e4 | 2019 | |
0fd7bac6 | 2020 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
1da177e4 LT |
2021 | goto drop_n_acct; |
2022 | ||
2023 | if (skb_shared(skb)) { | |
2024 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
2025 | if (nskb == NULL) | |
2026 | goto drop_n_acct; | |
2027 | ||
2028 | if (skb_head != skb->data) { | |
2029 | skb->data = skb_head; | |
2030 | skb->len = skb_len; | |
2031 | } | |
abc4e4fa | 2032 | consume_skb(skb); |
1da177e4 LT |
2033 | skb = nskb; |
2034 | } | |
2035 | ||
b4772ef8 | 2036 | sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8); |
ffbc6111 HX |
2037 | |
2038 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 | 2039 | sll->sll_hatype = dev->type; |
1da177e4 | 2040 | sll->sll_pkttype = skb->pkt_type; |
8032b464 | 2041 | if (unlikely(po->origdev)) |
80feaacb PWJ |
2042 | sll->sll_ifindex = orig_dev->ifindex; |
2043 | else | |
2044 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 2045 | |
b95cce35 | 2046 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 2047 | |
2472d761 EB |
2048 | /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg(). |
2049 | * Use their space for storing the original skb length. | |
2050 | */ | |
2051 | PACKET_SKB_CB(skb)->sa.origlen = skb->len; | |
8dc41944 | 2052 | |
1da177e4 LT |
2053 | if (pskb_trim(skb, snaplen)) |
2054 | goto drop_n_acct; | |
2055 | ||
2056 | skb_set_owner_r(skb, sk); | |
2057 | skb->dev = NULL; | |
adf30907 | 2058 | skb_dst_drop(skb); |
1da177e4 | 2059 | |
84531c24 PO |
2060 | /* drop conntrack reference */ |
2061 | nf_reset(skb); | |
2062 | ||
1da177e4 | 2063 | spin_lock(&sk->sk_receive_queue.lock); |
ee80fbf3 | 2064 | po->stats.stats1.tp_packets++; |
3bc3b96f | 2065 | sock_skb_set_dropcount(sk, skb); |
1da177e4 LT |
2066 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
2067 | spin_unlock(&sk->sk_receive_queue.lock); | |
676d2369 | 2068 | sk->sk_data_ready(sk); |
1da177e4 LT |
2069 | return 0; |
2070 | ||
2071 | drop_n_acct: | |
7091fbd8 | 2072 | spin_lock(&sk->sk_receive_queue.lock); |
ee80fbf3 | 2073 | po->stats.stats1.tp_drops++; |
7091fbd8 WB |
2074 | atomic_inc(&sk->sk_drops); |
2075 | spin_unlock(&sk->sk_receive_queue.lock); | |
1da177e4 LT |
2076 | |
2077 | drop_n_restore: | |
2078 | if (skb_head != skb->data && skb_shared(skb)) { | |
2079 | skb->data = skb_head; | |
2080 | skb->len = skb_len; | |
2081 | } | |
2082 | drop: | |
ead2ceb0 | 2083 | consume_skb(skb); |
1da177e4 LT |
2084 | return 0; |
2085 | } | |
2086 | ||
40d4e3df ED |
2087 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
2088 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
2089 | { |
2090 | struct sock *sk; | |
2091 | struct packet_sock *po; | |
2092 | struct sockaddr_ll *sll; | |
184f489e | 2093 | union tpacket_uhdr h; |
40d4e3df | 2094 | u8 *skb_head = skb->data; |
1da177e4 | 2095 | int skb_len = skb->len; |
dbcb5855 | 2096 | unsigned int snaplen, res; |
f6fb8f10 | 2097 | unsigned long status = TP_STATUS_USER; |
bbd6ef87 | 2098 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 2099 | struct sk_buff *copy_skb = NULL; |
bbd6ef87 | 2100 | struct timespec ts; |
b9c32fb2 | 2101 | __u32 ts_status; |
1da177e4 | 2102 | |
51846355 AW |
2103 | /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT. |
2104 | * We may add members to them until current aligned size without forcing | |
2105 | * userspace to call getsockopt(..., PACKET_HDRLEN, ...). | |
2106 | */ | |
2107 | BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32); | |
2108 | BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48); | |
2109 | ||
1da177e4 LT |
2110 | if (skb->pkt_type == PACKET_LOOPBACK) |
2111 | goto drop; | |
2112 | ||
2113 | sk = pt->af_packet_priv; | |
2114 | po = pkt_sk(sk); | |
2115 | ||
09ad9bc7 | 2116 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
2117 | goto drop; |
2118 | ||
3b04ddde | 2119 | if (dev->header_ops) { |
1da177e4 | 2120 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 2121 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
2122 | else if (skb->pkt_type == PACKET_OUTGOING) { |
2123 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 2124 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
2125 | } |
2126 | } | |
2127 | ||
2128 | snaplen = skb->len; | |
2129 | ||
dbcb5855 DM |
2130 | res = run_filter(skb, sk, snaplen); |
2131 | if (!res) | |
fda9ef5d | 2132 | goto drop_n_restore; |
68c2e5de AD |
2133 | |
2134 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
2135 | status |= TP_STATUS_CSUMNOTREADY; | |
682f048b AD |
2136 | else if (skb->pkt_type != PACKET_OUTGOING && |
2137 | (skb->ip_summed == CHECKSUM_COMPLETE || | |
2138 | skb_csum_unnecessary(skb))) | |
2139 | status |= TP_STATUS_CSUM_VALID; | |
68c2e5de | 2140 | |
dbcb5855 DM |
2141 | if (snaplen > res) |
2142 | snaplen = res; | |
1da177e4 LT |
2143 | |
2144 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
2145 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
2146 | po->tp_reserve; | |
1da177e4 | 2147 | } else { |
95c96174 | 2148 | unsigned int maclen = skb_network_offset(skb); |
bbd6ef87 | 2149 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a PM |
2150 | (maclen < 16 ? 16 : maclen)) + |
2151 | po->tp_reserve; | |
1da177e4 LT |
2152 | macoff = netoff - maclen; |
2153 | } | |
f6fb8f10 | 2154 | if (po->tp_version <= TPACKET_V2) { |
2155 | if (macoff + snaplen > po->rx_ring.frame_size) { | |
2156 | if (po->copy_thresh && | |
0fd7bac6 | 2157 | atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
f6fb8f10 | 2158 | if (skb_shared(skb)) { |
2159 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
2160 | } else { | |
2161 | copy_skb = skb_get(skb); | |
2162 | skb_head = skb->data; | |
2163 | } | |
2164 | if (copy_skb) | |
2165 | skb_set_owner_r(copy_skb, sk); | |
1da177e4 | 2166 | } |
f6fb8f10 | 2167 | snaplen = po->rx_ring.frame_size - macoff; |
2168 | if ((int)snaplen < 0) | |
2169 | snaplen = 0; | |
1da177e4 | 2170 | } |
dc808110 ED |
2171 | } else if (unlikely(macoff + snaplen > |
2172 | GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) { | |
2173 | u32 nval; | |
2174 | ||
2175 | nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff; | |
2176 | pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n", | |
2177 | snaplen, nval, macoff); | |
2178 | snaplen = nval; | |
2179 | if (unlikely((int)snaplen < 0)) { | |
2180 | snaplen = 0; | |
2181 | macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len; | |
2182 | } | |
1da177e4 | 2183 | } |
1da177e4 | 2184 | spin_lock(&sk->sk_receive_queue.lock); |
f6fb8f10 | 2185 | h.raw = packet_current_rx_frame(po, skb, |
2186 | TP_STATUS_KERNEL, (macoff+snaplen)); | |
bbd6ef87 | 2187 | if (!h.raw) |
1da177e4 | 2188 | goto ring_is_full; |
f6fb8f10 | 2189 | if (po->tp_version <= TPACKET_V2) { |
2190 | packet_increment_rx_head(po, &po->rx_ring); | |
2191 | /* | |
2192 | * LOSING will be reported till you read the stats, | |
2193 | * because it's COR - Clear On Read. | |
2194 | * Anyways, moving it for V1/V2 only as V3 doesn't need this | |
2195 | * at packet level. | |
2196 | */ | |
ee80fbf3 | 2197 | if (po->stats.stats1.tp_drops) |
f6fb8f10 | 2198 | status |= TP_STATUS_LOSING; |
2199 | } | |
ee80fbf3 | 2200 | po->stats.stats1.tp_packets++; |
1da177e4 LT |
2201 | if (copy_skb) { |
2202 | status |= TP_STATUS_COPY; | |
2203 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
2204 | } | |
1da177e4 LT |
2205 | spin_unlock(&sk->sk_receive_queue.lock); |
2206 | ||
bbd6ef87 | 2207 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
b9c32fb2 DB |
2208 | |
2209 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) | |
7a51384c | 2210 | getnstimeofday(&ts); |
1da177e4 | 2211 | |
b9c32fb2 DB |
2212 | status |= ts_status; |
2213 | ||
bbd6ef87 PM |
2214 | switch (po->tp_version) { |
2215 | case TPACKET_V1: | |
2216 | h.h1->tp_len = skb->len; | |
2217 | h.h1->tp_snaplen = snaplen; | |
2218 | h.h1->tp_mac = macoff; | |
2219 | h.h1->tp_net = netoff; | |
4b457bdf DB |
2220 | h.h1->tp_sec = ts.tv_sec; |
2221 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; | |
bbd6ef87 PM |
2222 | hdrlen = sizeof(*h.h1); |
2223 | break; | |
2224 | case TPACKET_V2: | |
2225 | h.h2->tp_len = skb->len; | |
2226 | h.h2->tp_snaplen = snaplen; | |
2227 | h.h2->tp_mac = macoff; | |
2228 | h.h2->tp_net = netoff; | |
bbd6ef87 PM |
2229 | h.h2->tp_sec = ts.tv_sec; |
2230 | h.h2->tp_nsec = ts.tv_nsec; | |
df8a39de JP |
2231 | if (skb_vlan_tag_present(skb)) { |
2232 | h.h2->tp_vlan_tci = skb_vlan_tag_get(skb); | |
a0cdfcf3 AW |
2233 | h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto); |
2234 | status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; | |
a3bcc23e BG |
2235 | } else { |
2236 | h.h2->tp_vlan_tci = 0; | |
a0cdfcf3 | 2237 | h.h2->tp_vlan_tpid = 0; |
a3bcc23e | 2238 | } |
e4d26f4b | 2239 | memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding)); |
bbd6ef87 PM |
2240 | hdrlen = sizeof(*h.h2); |
2241 | break; | |
f6fb8f10 | 2242 | case TPACKET_V3: |
2243 | /* tp_nxt_offset,vlan are already populated above. | |
2244 | * So DONT clear those fields here | |
2245 | */ | |
2246 | h.h3->tp_status |= status; | |
2247 | h.h3->tp_len = skb->len; | |
2248 | h.h3->tp_snaplen = snaplen; | |
2249 | h.h3->tp_mac = macoff; | |
2250 | h.h3->tp_net = netoff; | |
f6fb8f10 | 2251 | h.h3->tp_sec = ts.tv_sec; |
2252 | h.h3->tp_nsec = ts.tv_nsec; | |
e4d26f4b | 2253 | memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding)); |
f6fb8f10 | 2254 | hdrlen = sizeof(*h.h3); |
2255 | break; | |
bbd6ef87 PM |
2256 | default: |
2257 | BUG(); | |
2258 | } | |
1da177e4 | 2259 | |
bbd6ef87 | 2260 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 2261 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
2262 | sll->sll_family = AF_PACKET; |
2263 | sll->sll_hatype = dev->type; | |
2264 | sll->sll_protocol = skb->protocol; | |
2265 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 2266 | if (unlikely(po->origdev)) |
80feaacb PWJ |
2267 | sll->sll_ifindex = orig_dev->ifindex; |
2268 | else | |
2269 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 2270 | |
e16aa207 | 2271 | smp_mb(); |
f0d4eb29 | 2272 | |
f6dafa95 | 2273 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
f0d4eb29 | 2274 | if (po->tp_version <= TPACKET_V2) { |
0af55bb5 CG |
2275 | u8 *start, *end; |
2276 | ||
f0d4eb29 DB |
2277 | end = (u8 *) PAGE_ALIGN((unsigned long) h.raw + |
2278 | macoff + snaplen); | |
2279 | ||
2280 | for (start = h.raw; start < end; start += PAGE_SIZE) | |
2281 | flush_dcache_page(pgv_to_page(start)); | |
1da177e4 | 2282 | } |
f0d4eb29 | 2283 | smp_wmb(); |
f6dafa95 | 2284 | #endif |
f0d4eb29 | 2285 | |
da413eec | 2286 | if (po->tp_version <= TPACKET_V2) { |
f6fb8f10 | 2287 | __packet_set_status(po, h.raw, status); |
da413eec DC |
2288 | sk->sk_data_ready(sk); |
2289 | } else { | |
f6fb8f10 | 2290 | prb_clear_blk_fill_status(&po->rx_ring); |
da413eec | 2291 | } |
1da177e4 LT |
2292 | |
2293 | drop_n_restore: | |
2294 | if (skb_head != skb->data && skb_shared(skb)) { | |
2295 | skb->data = skb_head; | |
2296 | skb->len = skb_len; | |
2297 | } | |
2298 | drop: | |
1ce4f28b | 2299 | kfree_skb(skb); |
1da177e4 LT |
2300 | return 0; |
2301 | ||
2302 | ring_is_full: | |
ee80fbf3 | 2303 | po->stats.stats1.tp_drops++; |
1da177e4 LT |
2304 | spin_unlock(&sk->sk_receive_queue.lock); |
2305 | ||
676d2369 | 2306 | sk->sk_data_ready(sk); |
acb5d75b | 2307 | kfree_skb(copy_skb); |
1da177e4 LT |
2308 | goto drop_n_restore; |
2309 | } | |
2310 | ||
69e3c75f JB |
2311 | static void tpacket_destruct_skb(struct sk_buff *skb) |
2312 | { | |
2313 | struct packet_sock *po = pkt_sk(skb->sk); | |
1da177e4 | 2314 | |
69e3c75f | 2315 | if (likely(po->tx_ring.pg_vec)) { |
f0d4eb29 | 2316 | void *ph; |
b9c32fb2 DB |
2317 | __u32 ts; |
2318 | ||
69e3c75f | 2319 | ph = skb_shinfo(skb)->destructor_arg; |
b0138408 | 2320 | packet_dec_pending(&po->tx_ring); |
b9c32fb2 DB |
2321 | |
2322 | ts = __packet_set_timestamp(po, ph, skb); | |
2323 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts); | |
69e3c75f JB |
2324 | } |
2325 | ||
2326 | sock_wfree(skb); | |
2327 | } | |
2328 | ||
9c707762 WB |
2329 | static bool ll_header_truncated(const struct net_device *dev, int len) |
2330 | { | |
2331 | /* net device doesn't like empty head */ | |
2332 | if (unlikely(len <= dev->hard_header_len)) { | |
eee2f04b | 2333 | net_warn_ratelimited("%s: packet size is too short (%d <= %d)\n", |
9c707762 WB |
2334 | current->comm, len, dev->hard_header_len); |
2335 | return true; | |
2336 | } | |
2337 | ||
2338 | return false; | |
2339 | } | |
2340 | ||
c72219b7 DB |
2341 | static void tpacket_set_protocol(const struct net_device *dev, |
2342 | struct sk_buff *skb) | |
2343 | { | |
2344 | if (dev->type == ARPHRD_ETHER) { | |
2345 | skb_reset_mac_header(skb); | |
2346 | skb->protocol = eth_hdr(skb)->h_proto; | |
2347 | } | |
2348 | } | |
2349 | ||
40d4e3df ED |
2350 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
2351 | void *frame, struct net_device *dev, int size_max, | |
ae641949 | 2352 | __be16 proto, unsigned char *addr, int hlen) |
69e3c75f | 2353 | { |
184f489e | 2354 | union tpacket_uhdr ph; |
09effa67 | 2355 | int to_write, offset, len, tp_len, nr_frags, len_max; |
69e3c75f JB |
2356 | struct socket *sock = po->sk.sk_socket; |
2357 | struct page *page; | |
2358 | void *data; | |
2359 | int err; | |
2360 | ||
2361 | ph.raw = frame; | |
2362 | ||
2363 | skb->protocol = proto; | |
2364 | skb->dev = dev; | |
2365 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 2366 | skb->mark = po->sk.sk_mark; |
2e31396f | 2367 | sock_tx_timestamp(&po->sk, &skb_shinfo(skb)->tx_flags); |
69e3c75f JB |
2368 | skb_shinfo(skb)->destructor_arg = ph.raw; |
2369 | ||
2370 | switch (po->tp_version) { | |
2371 | case TPACKET_V2: | |
2372 | tp_len = ph.h2->tp_len; | |
2373 | break; | |
2374 | default: | |
2375 | tp_len = ph.h1->tp_len; | |
2376 | break; | |
2377 | } | |
09effa67 DM |
2378 | if (unlikely(tp_len > size_max)) { |
2379 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); | |
2380 | return -EMSGSIZE; | |
2381 | } | |
69e3c75f | 2382 | |
ae641949 | 2383 | skb_reserve(skb, hlen); |
69e3c75f | 2384 | skb_reset_network_header(skb); |
c1aad275 | 2385 | |
d346a3fa | 2386 | if (unlikely(po->tp_tx_has_off)) { |
5920cd3a PC |
2387 | int off_min, off_max, off; |
2388 | off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
2389 | off_max = po->tx_ring.frame_size - tp_len; | |
2390 | if (sock->type == SOCK_DGRAM) { | |
2391 | switch (po->tp_version) { | |
2392 | case TPACKET_V2: | |
2393 | off = ph.h2->tp_net; | |
2394 | break; | |
2395 | default: | |
2396 | off = ph.h1->tp_net; | |
2397 | break; | |
2398 | } | |
2399 | } else { | |
2400 | switch (po->tp_version) { | |
2401 | case TPACKET_V2: | |
2402 | off = ph.h2->tp_mac; | |
2403 | break; | |
2404 | default: | |
2405 | off = ph.h1->tp_mac; | |
2406 | break; | |
2407 | } | |
2408 | } | |
2409 | if (unlikely((off < off_min) || (off_max < off))) | |
2410 | return -EINVAL; | |
2411 | data = ph.raw + off; | |
2412 | } else { | |
2413 | data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
2414 | } | |
69e3c75f JB |
2415 | to_write = tp_len; |
2416 | ||
2417 | if (sock->type == SOCK_DGRAM) { | |
2418 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
2419 | NULL, tp_len); | |
2420 | if (unlikely(err < 0)) | |
2421 | return -EINVAL; | |
40d4e3df | 2422 | } else if (dev->hard_header_len) { |
9c707762 | 2423 | if (ll_header_truncated(dev, tp_len)) |
69e3c75f | 2424 | return -EINVAL; |
69e3c75f JB |
2425 | |
2426 | skb_push(skb, dev->hard_header_len); | |
2427 | err = skb_store_bits(skb, 0, data, | |
2428 | dev->hard_header_len); | |
2429 | if (unlikely(err)) | |
2430 | return err; | |
c72219b7 DB |
2431 | if (!skb->protocol) |
2432 | tpacket_set_protocol(dev, skb); | |
69e3c75f JB |
2433 | |
2434 | data += dev->hard_header_len; | |
2435 | to_write -= dev->hard_header_len; | |
2436 | } | |
2437 | ||
69e3c75f JB |
2438 | offset = offset_in_page(data); |
2439 | len_max = PAGE_SIZE - offset; | |
2440 | len = ((to_write > len_max) ? len_max : to_write); | |
2441 | ||
2442 | skb->data_len = to_write; | |
2443 | skb->len += to_write; | |
2444 | skb->truesize += to_write; | |
2445 | atomic_add(to_write, &po->sk.sk_wmem_alloc); | |
2446 | ||
2447 | while (likely(to_write)) { | |
2448 | nr_frags = skb_shinfo(skb)->nr_frags; | |
2449 | ||
2450 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
2451 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
2452 | MAX_SKB_FRAGS); | |
69e3c75f JB |
2453 | return -EFAULT; |
2454 | } | |
2455 | ||
0af55bb5 CG |
2456 | page = pgv_to_page(data); |
2457 | data += len; | |
69e3c75f JB |
2458 | flush_dcache_page(page); |
2459 | get_page(page); | |
0af55bb5 | 2460 | skb_fill_page_desc(skb, nr_frags, page, offset, len); |
69e3c75f JB |
2461 | to_write -= len; |
2462 | offset = 0; | |
2463 | len_max = PAGE_SIZE; | |
2464 | len = ((to_write > len_max) ? len_max : to_write); | |
2465 | } | |
2466 | ||
8fd6c80d | 2467 | skb_probe_transport_header(skb, 0); |
efdfa2f7 | 2468 | |
69e3c75f JB |
2469 | return tp_len; |
2470 | } | |
2471 | ||
2472 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) | |
2473 | { | |
69e3c75f JB |
2474 | struct sk_buff *skb; |
2475 | struct net_device *dev; | |
2476 | __be16 proto; | |
09effa67 | 2477 | int err, reserve = 0; |
40d4e3df | 2478 | void *ph; |
342dfc30 | 2479 | DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name); |
87a2fd28 | 2480 | bool need_wait = !(msg->msg_flags & MSG_DONTWAIT); |
69e3c75f JB |
2481 | int tp_len, size_max; |
2482 | unsigned char *addr; | |
2483 | int len_sum = 0; | |
9e67030a | 2484 | int status = TP_STATUS_AVAILABLE; |
ae641949 | 2485 | int hlen, tlen; |
69e3c75f | 2486 | |
69e3c75f JB |
2487 | mutex_lock(&po->pg_vec_lock); |
2488 | ||
66e56cd4 | 2489 | if (likely(saddr == NULL)) { |
e40526cb | 2490 | dev = packet_cached_dev_get(po); |
69e3c75f JB |
2491 | proto = po->num; |
2492 | addr = NULL; | |
2493 | } else { | |
2494 | err = -EINVAL; | |
2495 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
2496 | goto out; | |
2497 | if (msg->msg_namelen < (saddr->sll_halen | |
2498 | + offsetof(struct sockaddr_ll, | |
2499 | sll_addr))) | |
2500 | goto out; | |
69e3c75f JB |
2501 | proto = saddr->sll_protocol; |
2502 | addr = saddr->sll_addr; | |
827d9780 | 2503 | dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
69e3c75f JB |
2504 | } |
2505 | ||
69e3c75f JB |
2506 | err = -ENXIO; |
2507 | if (unlikely(dev == NULL)) | |
2508 | goto out; | |
69e3c75f JB |
2509 | err = -ENETDOWN; |
2510 | if (unlikely(!(dev->flags & IFF_UP))) | |
2511 | goto out_put; | |
2512 | ||
5cfb4c8d DB |
2513 | if (po->sk.sk_socket->type == SOCK_RAW) |
2514 | reserve = dev->hard_header_len; | |
69e3c75f | 2515 | size_max = po->tx_ring.frame_size |
b5dd884e | 2516 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f | 2517 | |
5cfb4c8d DB |
2518 | if (size_max > dev->mtu + reserve + VLAN_HLEN) |
2519 | size_max = dev->mtu + reserve + VLAN_HLEN; | |
09effa67 | 2520 | |
69e3c75f JB |
2521 | do { |
2522 | ph = packet_current_frame(po, &po->tx_ring, | |
87a2fd28 | 2523 | TP_STATUS_SEND_REQUEST); |
69e3c75f | 2524 | if (unlikely(ph == NULL)) { |
87a2fd28 DB |
2525 | if (need_wait && need_resched()) |
2526 | schedule(); | |
69e3c75f JB |
2527 | continue; |
2528 | } | |
2529 | ||
2530 | status = TP_STATUS_SEND_REQUEST; | |
ae641949 HX |
2531 | hlen = LL_RESERVED_SPACE(dev); |
2532 | tlen = dev->needed_tailroom; | |
69e3c75f | 2533 | skb = sock_alloc_send_skb(&po->sk, |
ae641949 | 2534 | hlen + tlen + sizeof(struct sockaddr_ll), |
fbf33a28 | 2535 | !need_wait, &err); |
69e3c75f | 2536 | |
fbf33a28 KM |
2537 | if (unlikely(skb == NULL)) { |
2538 | /* we assume the socket was initially writeable ... */ | |
2539 | if (likely(len_sum > 0)) | |
2540 | err = len_sum; | |
69e3c75f | 2541 | goto out_status; |
fbf33a28 | 2542 | } |
69e3c75f | 2543 | tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, |
52f1454f | 2544 | addr, hlen); |
dbd46ab4 | 2545 | if (likely(tp_len >= 0) && |
5cfb4c8d | 2546 | tp_len > dev->mtu + reserve && |
3c70c132 DB |
2547 | !packet_extra_vlan_len_allowed(dev, skb)) |
2548 | tp_len = -EMSGSIZE; | |
69e3c75f JB |
2549 | |
2550 | if (unlikely(tp_len < 0)) { | |
2551 | if (po->tp_loss) { | |
2552 | __packet_set_status(po, ph, | |
2553 | TP_STATUS_AVAILABLE); | |
2554 | packet_increment_head(&po->tx_ring); | |
2555 | kfree_skb(skb); | |
2556 | continue; | |
2557 | } else { | |
2558 | status = TP_STATUS_WRONG_FORMAT; | |
2559 | err = tp_len; | |
2560 | goto out_status; | |
2561 | } | |
2562 | } | |
2563 | ||
0fd5d57b DB |
2564 | packet_pick_tx_queue(dev, skb); |
2565 | ||
69e3c75f JB |
2566 | skb->destructor = tpacket_destruct_skb; |
2567 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
b0138408 | 2568 | packet_inc_pending(&po->tx_ring); |
69e3c75f JB |
2569 | |
2570 | status = TP_STATUS_SEND_REQUEST; | |
d346a3fa | 2571 | err = po->xmit(skb); |
eb70df13 JP |
2572 | if (unlikely(err > 0)) { |
2573 | err = net_xmit_errno(err); | |
2574 | if (err && __packet_get_status(po, ph) == | |
2575 | TP_STATUS_AVAILABLE) { | |
2576 | /* skb was destructed already */ | |
2577 | skb = NULL; | |
2578 | goto out_status; | |
2579 | } | |
2580 | /* | |
2581 | * skb was dropped but not destructed yet; | |
2582 | * let's treat it like congestion or err < 0 | |
2583 | */ | |
2584 | err = 0; | |
2585 | } | |
69e3c75f JB |
2586 | packet_increment_head(&po->tx_ring); |
2587 | len_sum += tp_len; | |
b0138408 DB |
2588 | } while (likely((ph != NULL) || |
2589 | /* Note: packet_read_pending() might be slow if we have | |
2590 | * to call it as it's per_cpu variable, but in fast-path | |
2591 | * we already short-circuit the loop with the first | |
2592 | * condition, and luckily don't have to go that path | |
2593 | * anyway. | |
2594 | */ | |
2595 | (need_wait && packet_read_pending(&po->tx_ring)))); | |
69e3c75f JB |
2596 | |
2597 | err = len_sum; | |
2598 | goto out_put; | |
2599 | ||
69e3c75f JB |
2600 | out_status: |
2601 | __packet_set_status(po, ph, status); | |
2602 | kfree_skb(skb); | |
2603 | out_put: | |
e40526cb | 2604 | dev_put(dev); |
69e3c75f JB |
2605 | out: |
2606 | mutex_unlock(&po->pg_vec_lock); | |
2607 | return err; | |
2608 | } | |
69e3c75f | 2609 | |
eea49cc9 OJ |
2610 | static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
2611 | size_t reserve, size_t len, | |
2612 | size_t linear, int noblock, | |
2613 | int *err) | |
bfd5f4a3 SS |
2614 | { |
2615 | struct sk_buff *skb; | |
2616 | ||
2617 | /* Under a page? Don't bother with paged skb. */ | |
2618 | if (prepad + len < PAGE_SIZE || !linear) | |
2619 | linear = len; | |
2620 | ||
2621 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
28d64271 | 2622 | err, 0); |
bfd5f4a3 SS |
2623 | if (!skb) |
2624 | return NULL; | |
2625 | ||
2626 | skb_reserve(skb, reserve); | |
2627 | skb_put(skb, linear); | |
2628 | skb->data_len = len - linear; | |
2629 | skb->len += len - linear; | |
2630 | ||
2631 | return skb; | |
2632 | } | |
2633 | ||
d346a3fa | 2634 | static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
2635 | { |
2636 | struct sock *sk = sock->sk; | |
342dfc30 | 2637 | DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name); |
1da177e4 LT |
2638 | struct sk_buff *skb; |
2639 | struct net_device *dev; | |
0e11c91e | 2640 | __be16 proto; |
1da177e4 | 2641 | unsigned char *addr; |
827d9780 | 2642 | int err, reserve = 0; |
c7d39e32 | 2643 | struct sockcm_cookie sockc; |
bfd5f4a3 SS |
2644 | struct virtio_net_hdr vnet_hdr = { 0 }; |
2645 | int offset = 0; | |
2646 | int vnet_hdr_len; | |
2647 | struct packet_sock *po = pkt_sk(sk); | |
2648 | unsigned short gso_type = 0; | |
ae641949 | 2649 | int hlen, tlen; |
3bdc0eba | 2650 | int extra_len = 0; |
8feb2fb2 | 2651 | ssize_t n; |
1da177e4 LT |
2652 | |
2653 | /* | |
1ce4f28b | 2654 | * Get and verify the address. |
1da177e4 | 2655 | */ |
1ce4f28b | 2656 | |
66e56cd4 | 2657 | if (likely(saddr == NULL)) { |
e40526cb | 2658 | dev = packet_cached_dev_get(po); |
1da177e4 LT |
2659 | proto = po->num; |
2660 | addr = NULL; | |
2661 | } else { | |
2662 | err = -EINVAL; | |
2663 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
2664 | goto out; | |
0fb375fb EB |
2665 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
2666 | goto out; | |
1da177e4 LT |
2667 | proto = saddr->sll_protocol; |
2668 | addr = saddr->sll_addr; | |
827d9780 | 2669 | dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
1da177e4 LT |
2670 | } |
2671 | ||
1da177e4 | 2672 | err = -ENXIO; |
e40526cb | 2673 | if (unlikely(dev == NULL)) |
1da177e4 | 2674 | goto out_unlock; |
d5e76b0a | 2675 | err = -ENETDOWN; |
e40526cb | 2676 | if (unlikely(!(dev->flags & IFF_UP))) |
d5e76b0a DM |
2677 | goto out_unlock; |
2678 | ||
c7d39e32 EJ |
2679 | sockc.mark = sk->sk_mark; |
2680 | if (msg->msg_controllen) { | |
2681 | err = sock_cmsg_send(sk, msg, &sockc); | |
2682 | if (unlikely(err)) | |
2683 | goto out_unlock; | |
2684 | } | |
2685 | ||
e40526cb DB |
2686 | if (sock->type == SOCK_RAW) |
2687 | reserve = dev->hard_header_len; | |
bfd5f4a3 SS |
2688 | if (po->has_vnet_hdr) { |
2689 | vnet_hdr_len = sizeof(vnet_hdr); | |
2690 | ||
2691 | err = -EINVAL; | |
2692 | if (len < vnet_hdr_len) | |
2693 | goto out_unlock; | |
2694 | ||
2695 | len -= vnet_hdr_len; | |
2696 | ||
8feb2fb2 | 2697 | err = -EFAULT; |
c0371da6 | 2698 | n = copy_from_iter(&vnet_hdr, vnet_hdr_len, &msg->msg_iter); |
8feb2fb2 | 2699 | if (n != vnet_hdr_len) |
bfd5f4a3 SS |
2700 | goto out_unlock; |
2701 | ||
2702 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
d3869efe DW |
2703 | (__virtio16_to_cpu(vio_le(), vnet_hdr.csum_start) + |
2704 | __virtio16_to_cpu(vio_le(), vnet_hdr.csum_offset) + 2 > | |
2705 | __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len))) | |
2706 | vnet_hdr.hdr_len = __cpu_to_virtio16(vio_le(), | |
2707 | __virtio16_to_cpu(vio_le(), vnet_hdr.csum_start) + | |
2708 | __virtio16_to_cpu(vio_le(), vnet_hdr.csum_offset) + 2); | |
bfd5f4a3 SS |
2709 | |
2710 | err = -EINVAL; | |
d3869efe | 2711 | if (__virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len) > len) |
bfd5f4a3 SS |
2712 | goto out_unlock; |
2713 | ||
2714 | if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
2715 | switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
2716 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
2717 | gso_type = SKB_GSO_TCPV4; | |
2718 | break; | |
2719 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
2720 | gso_type = SKB_GSO_TCPV6; | |
2721 | break; | |
2722 | case VIRTIO_NET_HDR_GSO_UDP: | |
2723 | gso_type = SKB_GSO_UDP; | |
2724 | break; | |
2725 | default: | |
2726 | goto out_unlock; | |
2727 | } | |
2728 | ||
2729 | if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
2730 | gso_type |= SKB_GSO_TCP_ECN; | |
2731 | ||
2732 | if (vnet_hdr.gso_size == 0) | |
2733 | goto out_unlock; | |
2734 | ||
2735 | } | |
2736 | } | |
2737 | ||
3bdc0eba BG |
2738 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
2739 | if (!netif_supports_nofcs(dev)) { | |
2740 | err = -EPROTONOSUPPORT; | |
2741 | goto out_unlock; | |
2742 | } | |
2743 | extra_len = 4; /* We're doing our own CRC */ | |
2744 | } | |
2745 | ||
1da177e4 | 2746 | err = -EMSGSIZE; |
3bdc0eba | 2747 | if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN + extra_len)) |
1da177e4 LT |
2748 | goto out_unlock; |
2749 | ||
bfd5f4a3 | 2750 | err = -ENOBUFS; |
ae641949 HX |
2751 | hlen = LL_RESERVED_SPACE(dev); |
2752 | tlen = dev->needed_tailroom; | |
dc9e5153 | 2753 | skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, |
d3869efe | 2754 | __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len), |
bfd5f4a3 | 2755 | msg->msg_flags & MSG_DONTWAIT, &err); |
40d4e3df | 2756 | if (skb == NULL) |
1da177e4 LT |
2757 | goto out_unlock; |
2758 | ||
bfd5f4a3 | 2759 | skb_set_network_header(skb, reserve); |
1da177e4 | 2760 | |
0c4e8581 | 2761 | err = -EINVAL; |
9c707762 WB |
2762 | if (sock->type == SOCK_DGRAM) { |
2763 | offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len); | |
46d2cfb1 | 2764 | if (unlikely(offset < 0)) |
9c707762 WB |
2765 | goto out_free; |
2766 | } else { | |
2767 | if (ll_header_truncated(dev, len)) | |
2768 | goto out_free; | |
2769 | } | |
1da177e4 LT |
2770 | |
2771 | /* Returns -EFAULT on error */ | |
c0371da6 | 2772 | err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len); |
1da177e4 LT |
2773 | if (err) |
2774 | goto out_free; | |
bf84a010 DB |
2775 | |
2776 | sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); | |
1da177e4 | 2777 | |
3c70c132 DB |
2778 | if (!gso_type && (len > dev->mtu + reserve + extra_len) && |
2779 | !packet_extra_vlan_len_allowed(dev, skb)) { | |
2780 | err = -EMSGSIZE; | |
2781 | goto out_free; | |
57f89bfa BG |
2782 | } |
2783 | ||
09effa67 DM |
2784 | skb->protocol = proto; |
2785 | skb->dev = dev; | |
1da177e4 | 2786 | skb->priority = sk->sk_priority; |
c7d39e32 | 2787 | skb->mark = sockc.mark; |
0fd5d57b DB |
2788 | |
2789 | packet_pick_tx_queue(dev, skb); | |
1da177e4 | 2790 | |
bfd5f4a3 SS |
2791 | if (po->has_vnet_hdr) { |
2792 | if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
d3869efe DW |
2793 | u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr.csum_start); |
2794 | u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr.csum_offset); | |
dc9e5153 | 2795 | if (!skb_partial_csum_set(skb, s, o)) { |
bfd5f4a3 SS |
2796 | err = -EINVAL; |
2797 | goto out_free; | |
2798 | } | |
2799 | } | |
2800 | ||
dc9e5153 | 2801 | skb_shinfo(skb)->gso_size = |
d3869efe | 2802 | __virtio16_to_cpu(vio_le(), vnet_hdr.gso_size); |
bfd5f4a3 SS |
2803 | skb_shinfo(skb)->gso_type = gso_type; |
2804 | ||
2805 | /* Header must be checked, and gso_segs computed. */ | |
2806 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
2807 | skb_shinfo(skb)->gso_segs = 0; | |
2808 | ||
2809 | len += vnet_hdr_len; | |
2810 | } | |
2811 | ||
8fd6c80d DB |
2812 | skb_probe_transport_header(skb, reserve); |
2813 | ||
3bdc0eba BG |
2814 | if (unlikely(extra_len == 4)) |
2815 | skb->no_fcs = 1; | |
2816 | ||
d346a3fa | 2817 | err = po->xmit(skb); |
1da177e4 LT |
2818 | if (err > 0 && (err = net_xmit_errno(err)) != 0) |
2819 | goto out_unlock; | |
2820 | ||
e40526cb | 2821 | dev_put(dev); |
1da177e4 | 2822 | |
40d4e3df | 2823 | return len; |
1da177e4 LT |
2824 | |
2825 | out_free: | |
2826 | kfree_skb(skb); | |
2827 | out_unlock: | |
e40526cb | 2828 | if (dev) |
1da177e4 LT |
2829 | dev_put(dev); |
2830 | out: | |
2831 | return err; | |
2832 | } | |
2833 | ||
1b784140 | 2834 | static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
69e3c75f | 2835 | { |
69e3c75f JB |
2836 | struct sock *sk = sock->sk; |
2837 | struct packet_sock *po = pkt_sk(sk); | |
d346a3fa | 2838 | |
69e3c75f JB |
2839 | if (po->tx_ring.pg_vec) |
2840 | return tpacket_snd(po, msg); | |
2841 | else | |
69e3c75f JB |
2842 | return packet_snd(sock, msg, len); |
2843 | } | |
2844 | ||
1da177e4 LT |
2845 | /* |
2846 | * Close a PACKET socket. This is fairly simple. We immediately go | |
2847 | * to 'closed' state and remove our protocol entry in the device list. | |
2848 | */ | |
2849 | ||
2850 | static int packet_release(struct socket *sock) | |
2851 | { | |
2852 | struct sock *sk = sock->sk; | |
2853 | struct packet_sock *po; | |
d12d01d6 | 2854 | struct net *net; |
f6fb8f10 | 2855 | union tpacket_req_u req_u; |
1da177e4 LT |
2856 | |
2857 | if (!sk) | |
2858 | return 0; | |
2859 | ||
3b1e0a65 | 2860 | net = sock_net(sk); |
1da177e4 LT |
2861 | po = pkt_sk(sk); |
2862 | ||
0fa7fa98 | 2863 | mutex_lock(&net->packet.sklist_lock); |
808f5114 | 2864 | sk_del_node_init_rcu(sk); |
0fa7fa98 PE |
2865 | mutex_unlock(&net->packet.sklist_lock); |
2866 | ||
2867 | preempt_disable(); | |
920de804 | 2868 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
0fa7fa98 | 2869 | preempt_enable(); |
1da177e4 | 2870 | |
808f5114 | 2871 | spin_lock(&po->bind_lock); |
ce06b03e | 2872 | unregister_prot_hook(sk, false); |
66e56cd4 DB |
2873 | packet_cached_dev_reset(po); |
2874 | ||
160ff18a BG |
2875 | if (po->prot_hook.dev) { |
2876 | dev_put(po->prot_hook.dev); | |
2877 | po->prot_hook.dev = NULL; | |
2878 | } | |
808f5114 | 2879 | spin_unlock(&po->bind_lock); |
1da177e4 | 2880 | |
1da177e4 | 2881 | packet_flush_mclist(sk); |
1da177e4 | 2882 | |
9665d5d6 PS |
2883 | if (po->rx_ring.pg_vec) { |
2884 | memset(&req_u, 0, sizeof(req_u)); | |
f6fb8f10 | 2885 | packet_set_ring(sk, &req_u, 1, 0); |
9665d5d6 | 2886 | } |
69e3c75f | 2887 | |
9665d5d6 PS |
2888 | if (po->tx_ring.pg_vec) { |
2889 | memset(&req_u, 0, sizeof(req_u)); | |
f6fb8f10 | 2890 | packet_set_ring(sk, &req_u, 1, 1); |
9665d5d6 | 2891 | } |
1da177e4 | 2892 | |
dc99f600 DM |
2893 | fanout_release(sk); |
2894 | ||
808f5114 | 2895 | synchronize_net(); |
1da177e4 LT |
2896 | /* |
2897 | * Now the socket is dead. No more input will appear. | |
2898 | */ | |
1da177e4 LT |
2899 | sock_orphan(sk); |
2900 | sock->sk = NULL; | |
2901 | ||
2902 | /* Purge queues */ | |
2903 | ||
2904 | skb_queue_purge(&sk->sk_receive_queue); | |
b0138408 | 2905 | packet_free_pending(po); |
17ab56a2 | 2906 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
2907 | |
2908 | sock_put(sk); | |
2909 | return 0; | |
2910 | } | |
2911 | ||
2912 | /* | |
2913 | * Attach a packet hook. | |
2914 | */ | |
2915 | ||
30f7ea1c FR |
2916 | static int packet_do_bind(struct sock *sk, const char *name, int ifindex, |
2917 | __be16 proto) | |
1da177e4 LT |
2918 | { |
2919 | struct packet_sock *po = pkt_sk(sk); | |
158cd4af | 2920 | struct net_device *dev_curr; |
902fefb8 DB |
2921 | __be16 proto_curr; |
2922 | bool need_rehook; | |
30f7ea1c FR |
2923 | struct net_device *dev = NULL; |
2924 | int ret = 0; | |
2925 | bool unlisted = false; | |
dc99f600 | 2926 | |
30f7ea1c | 2927 | if (po->fanout) |
dc99f600 | 2928 | return -EINVAL; |
1da177e4 LT |
2929 | |
2930 | lock_sock(sk); | |
1da177e4 | 2931 | spin_lock(&po->bind_lock); |
30f7ea1c FR |
2932 | rcu_read_lock(); |
2933 | ||
2934 | if (name) { | |
2935 | dev = dev_get_by_name_rcu(sock_net(sk), name); | |
2936 | if (!dev) { | |
2937 | ret = -ENODEV; | |
2938 | goto out_unlock; | |
2939 | } | |
2940 | } else if (ifindex) { | |
2941 | dev = dev_get_by_index_rcu(sock_net(sk), ifindex); | |
2942 | if (!dev) { | |
2943 | ret = -ENODEV; | |
2944 | goto out_unlock; | |
2945 | } | |
2946 | } | |
2947 | ||
2948 | if (dev) | |
2949 | dev_hold(dev); | |
66e56cd4 | 2950 | |
902fefb8 DB |
2951 | proto_curr = po->prot_hook.type; |
2952 | dev_curr = po->prot_hook.dev; | |
2953 | ||
2954 | need_rehook = proto_curr != proto || dev_curr != dev; | |
2955 | ||
2956 | if (need_rehook) { | |
30f7ea1c FR |
2957 | if (po->running) { |
2958 | rcu_read_unlock(); | |
2959 | __unregister_prot_hook(sk, true); | |
2960 | rcu_read_lock(); | |
2961 | dev_curr = po->prot_hook.dev; | |
2962 | if (dev) | |
2963 | unlisted = !dev_get_by_index_rcu(sock_net(sk), | |
2964 | dev->ifindex); | |
2965 | } | |
1da177e4 | 2966 | |
902fefb8 DB |
2967 | po->num = proto; |
2968 | po->prot_hook.type = proto; | |
902fefb8 | 2969 | |
30f7ea1c FR |
2970 | if (unlikely(unlisted)) { |
2971 | dev_put(dev); | |
2972 | po->prot_hook.dev = NULL; | |
2973 | po->ifindex = -1; | |
2974 | packet_cached_dev_reset(po); | |
2975 | } else { | |
2976 | po->prot_hook.dev = dev; | |
2977 | po->ifindex = dev ? dev->ifindex : 0; | |
2978 | packet_cached_dev_assign(po, dev); | |
2979 | } | |
902fefb8 | 2980 | } |
158cd4af LW |
2981 | if (dev_curr) |
2982 | dev_put(dev_curr); | |
66e56cd4 | 2983 | |
902fefb8 | 2984 | if (proto == 0 || !need_rehook) |
1da177e4 LT |
2985 | goto out_unlock; |
2986 | ||
30f7ea1c | 2987 | if (!unlisted && (!dev || (dev->flags & IFF_UP))) { |
ce06b03e | 2988 | register_prot_hook(sk); |
be85d4ad UT |
2989 | } else { |
2990 | sk->sk_err = ENETDOWN; | |
2991 | if (!sock_flag(sk, SOCK_DEAD)) | |
2992 | sk->sk_error_report(sk); | |
1da177e4 LT |
2993 | } |
2994 | ||
2995 | out_unlock: | |
30f7ea1c | 2996 | rcu_read_unlock(); |
1da177e4 LT |
2997 | spin_unlock(&po->bind_lock); |
2998 | release_sock(sk); | |
30f7ea1c | 2999 | return ret; |
1da177e4 LT |
3000 | } |
3001 | ||
3002 | /* | |
3003 | * Bind a packet socket to a device | |
3004 | */ | |
3005 | ||
40d4e3df ED |
3006 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
3007 | int addr_len) | |
1da177e4 | 3008 | { |
40d4e3df | 3009 | struct sock *sk = sock->sk; |
1da177e4 | 3010 | char name[15]; |
1ce4f28b | 3011 | |
1da177e4 LT |
3012 | /* |
3013 | * Check legality | |
3014 | */ | |
1ce4f28b | 3015 | |
8ae55f04 | 3016 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 3017 | return -EINVAL; |
40d4e3df | 3018 | strlcpy(name, uaddr->sa_data, sizeof(name)); |
1da177e4 | 3019 | |
30f7ea1c | 3020 | return packet_do_bind(sk, name, 0, pkt_sk(sk)->num); |
1da177e4 | 3021 | } |
1da177e4 LT |
3022 | |
3023 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
3024 | { | |
40d4e3df ED |
3025 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
3026 | struct sock *sk = sock->sk; | |
1da177e4 LT |
3027 | |
3028 | /* | |
3029 | * Check legality | |
3030 | */ | |
1ce4f28b | 3031 | |
1da177e4 LT |
3032 | if (addr_len < sizeof(struct sockaddr_ll)) |
3033 | return -EINVAL; | |
3034 | if (sll->sll_family != AF_PACKET) | |
3035 | return -EINVAL; | |
3036 | ||
30f7ea1c FR |
3037 | return packet_do_bind(sk, NULL, sll->sll_ifindex, |
3038 | sll->sll_protocol ? : pkt_sk(sk)->num); | |
1da177e4 LT |
3039 | } |
3040 | ||
3041 | static struct proto packet_proto = { | |
3042 | .name = "PACKET", | |
3043 | .owner = THIS_MODULE, | |
3044 | .obj_size = sizeof(struct packet_sock), | |
3045 | }; | |
3046 | ||
3047 | /* | |
1ce4f28b | 3048 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
3049 | */ |
3050 | ||
3f378b68 EP |
3051 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
3052 | int kern) | |
1da177e4 LT |
3053 | { |
3054 | struct sock *sk; | |
3055 | struct packet_sock *po; | |
0e11c91e | 3056 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
3057 | int err; |
3058 | ||
df008c91 | 3059 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
1da177e4 | 3060 | return -EPERM; |
be02097c DM |
3061 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
3062 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
3063 | return -ESOCKTNOSUPPORT; |
3064 | ||
3065 | sock->state = SS_UNCONNECTED; | |
3066 | ||
3067 | err = -ENOBUFS; | |
11aa9c28 | 3068 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern); |
1da177e4 LT |
3069 | if (sk == NULL) |
3070 | goto out; | |
3071 | ||
3072 | sock->ops = &packet_ops; | |
1da177e4 LT |
3073 | if (sock->type == SOCK_PACKET) |
3074 | sock->ops = &packet_ops_spkt; | |
be02097c | 3075 | |
1da177e4 LT |
3076 | sock_init_data(sock, sk); |
3077 | ||
3078 | po = pkt_sk(sk); | |
3079 | sk->sk_family = PF_PACKET; | |
0e11c91e | 3080 | po->num = proto; |
d346a3fa | 3081 | po->xmit = dev_queue_xmit; |
66e56cd4 | 3082 | |
b0138408 DB |
3083 | err = packet_alloc_pending(po); |
3084 | if (err) | |
3085 | goto out2; | |
3086 | ||
66e56cd4 | 3087 | packet_cached_dev_reset(po); |
1da177e4 LT |
3088 | |
3089 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 3090 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
3091 | |
3092 | /* | |
3093 | * Attach a protocol block | |
3094 | */ | |
3095 | ||
3096 | spin_lock_init(&po->bind_lock); | |
905db440 | 3097 | mutex_init(&po->pg_vec_lock); |
0648ab70 | 3098 | po->rollover = NULL; |
1da177e4 | 3099 | po->prot_hook.func = packet_rcv; |
be02097c | 3100 | |
1da177e4 LT |
3101 | if (sock->type == SOCK_PACKET) |
3102 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 3103 | |
1da177e4 LT |
3104 | po->prot_hook.af_packet_priv = sk; |
3105 | ||
0e11c91e AV |
3106 | if (proto) { |
3107 | po->prot_hook.type = proto; | |
ce06b03e | 3108 | register_prot_hook(sk); |
1da177e4 LT |
3109 | } |
3110 | ||
0fa7fa98 | 3111 | mutex_lock(&net->packet.sklist_lock); |
808f5114 | 3112 | sk_add_node_rcu(sk, &net->packet.sklist); |
0fa7fa98 PE |
3113 | mutex_unlock(&net->packet.sklist_lock); |
3114 | ||
3115 | preempt_disable(); | |
3680453c | 3116 | sock_prot_inuse_add(net, &packet_proto, 1); |
0fa7fa98 | 3117 | preempt_enable(); |
808f5114 | 3118 | |
40d4e3df | 3119 | return 0; |
b0138408 DB |
3120 | out2: |
3121 | sk_free(sk); | |
1da177e4 LT |
3122 | out: |
3123 | return err; | |
3124 | } | |
3125 | ||
3126 | /* | |
3127 | * Pull a packet from our receive queue and hand it to the user. | |
3128 | * If necessary we block. | |
3129 | */ | |
3130 | ||
1b784140 YX |
3131 | static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
3132 | int flags) | |
1da177e4 LT |
3133 | { |
3134 | struct sock *sk = sock->sk; | |
3135 | struct sk_buff *skb; | |
3136 | int copied, err; | |
bfd5f4a3 | 3137 | int vnet_hdr_len = 0; |
2472d761 | 3138 | unsigned int origlen = 0; |
1da177e4 LT |
3139 | |
3140 | err = -EINVAL; | |
ed85b565 | 3141 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
1da177e4 LT |
3142 | goto out; |
3143 | ||
3144 | #if 0 | |
3145 | /* What error should we return now? EUNATTACH? */ | |
3146 | if (pkt_sk(sk)->ifindex < 0) | |
3147 | return -ENODEV; | |
3148 | #endif | |
3149 | ||
ed85b565 | 3150 | if (flags & MSG_ERRQUEUE) { |
cb820f8e RC |
3151 | err = sock_recv_errqueue(sk, msg, len, |
3152 | SOL_PACKET, PACKET_TX_TIMESTAMP); | |
ed85b565 RC |
3153 | goto out; |
3154 | } | |
3155 | ||
1da177e4 LT |
3156 | /* |
3157 | * Call the generic datagram receiver. This handles all sorts | |
3158 | * of horrible races and re-entrancy so we can forget about it | |
3159 | * in the protocol layers. | |
3160 | * | |
3161 | * Now it will return ENETDOWN, if device have just gone down, | |
3162 | * but then it will block. | |
3163 | */ | |
3164 | ||
40d4e3df | 3165 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
3166 | |
3167 | /* | |
1ce4f28b | 3168 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
3169 | * handles the blocking we don't see and worry about blocking |
3170 | * retries. | |
3171 | */ | |
3172 | ||
8ae55f04 | 3173 | if (skb == NULL) |
1da177e4 LT |
3174 | goto out; |
3175 | ||
2ccdbaa6 WB |
3176 | if (pkt_sk(sk)->pressure) |
3177 | packet_rcv_has_room(pkt_sk(sk), NULL); | |
3178 | ||
bfd5f4a3 SS |
3179 | if (pkt_sk(sk)->has_vnet_hdr) { |
3180 | struct virtio_net_hdr vnet_hdr = { 0 }; | |
3181 | ||
3182 | err = -EINVAL; | |
3183 | vnet_hdr_len = sizeof(vnet_hdr); | |
1f18b717 | 3184 | if (len < vnet_hdr_len) |
bfd5f4a3 SS |
3185 | goto out_free; |
3186 | ||
1f18b717 MK |
3187 | len -= vnet_hdr_len; |
3188 | ||
bfd5f4a3 SS |
3189 | if (skb_is_gso(skb)) { |
3190 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
3191 | ||
3192 | /* This is a hint as to how much should be linear. */ | |
dc9e5153 | 3193 | vnet_hdr.hdr_len = |
d3869efe | 3194 | __cpu_to_virtio16(vio_le(), skb_headlen(skb)); |
dc9e5153 | 3195 | vnet_hdr.gso_size = |
d3869efe | 3196 | __cpu_to_virtio16(vio_le(), sinfo->gso_size); |
bfd5f4a3 SS |
3197 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
3198 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
3199 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
3200 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
3201 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
3202 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
3203 | else if (sinfo->gso_type & SKB_GSO_FCOE) | |
3204 | goto out_free; | |
3205 | else | |
3206 | BUG(); | |
3207 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
3208 | vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
3209 | } else | |
3210 | vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
3211 | ||
3212 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
3213 | vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
d3869efe | 3214 | vnet_hdr.csum_start = __cpu_to_virtio16(vio_le(), |
dc9e5153 | 3215 | skb_checksum_start_offset(skb)); |
d3869efe | 3216 | vnet_hdr.csum_offset = __cpu_to_virtio16(vio_le(), |
dc9e5153 | 3217 | skb->csum_offset); |
10a8d94a JW |
3218 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
3219 | vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
bfd5f4a3 SS |
3220 | } /* else everything is zero */ |
3221 | ||
7eab8d9e | 3222 | err = memcpy_to_msg(msg, (void *)&vnet_hdr, vnet_hdr_len); |
bfd5f4a3 SS |
3223 | if (err < 0) |
3224 | goto out_free; | |
3225 | } | |
3226 | ||
f3d33426 HFS |
3227 | /* You lose any data beyond the buffer you gave. If it worries |
3228 | * a user program they can ask the device for its MTU | |
3229 | * anyway. | |
1da177e4 | 3230 | */ |
1da177e4 | 3231 | copied = skb->len; |
40d4e3df ED |
3232 | if (copied > len) { |
3233 | copied = len; | |
3234 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
3235 | } |
3236 | ||
51f3d02b | 3237 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 LT |
3238 | if (err) |
3239 | goto out_free; | |
3240 | ||
2472d761 EB |
3241 | if (sock->type != SOCK_PACKET) { |
3242 | struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; | |
3243 | ||
3244 | /* Original length was stored in sockaddr_ll fields */ | |
3245 | origlen = PACKET_SKB_CB(skb)->sa.origlen; | |
3246 | sll->sll_family = AF_PACKET; | |
3247 | sll->sll_protocol = skb->protocol; | |
3248 | } | |
3249 | ||
3b885787 | 3250 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 | 3251 | |
f3d33426 HFS |
3252 | if (msg->msg_name) { |
3253 | /* If the address length field is there to be filled | |
3254 | * in, we fill it in now. | |
3255 | */ | |
3256 | if (sock->type == SOCK_PACKET) { | |
342dfc30 | 3257 | __sockaddr_check_size(sizeof(struct sockaddr_pkt)); |
f3d33426 HFS |
3258 | msg->msg_namelen = sizeof(struct sockaddr_pkt); |
3259 | } else { | |
3260 | struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; | |
2472d761 | 3261 | |
f3d33426 HFS |
3262 | msg->msg_namelen = sll->sll_halen + |
3263 | offsetof(struct sockaddr_ll, sll_addr); | |
3264 | } | |
ffbc6111 HX |
3265 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
3266 | msg->msg_namelen); | |
f3d33426 | 3267 | } |
1da177e4 | 3268 | |
8dc41944 | 3269 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
3270 | struct tpacket_auxdata aux; |
3271 | ||
3272 | aux.tp_status = TP_STATUS_USER; | |
3273 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
3274 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
682f048b AD |
3275 | else if (skb->pkt_type != PACKET_OUTGOING && |
3276 | (skb->ip_summed == CHECKSUM_COMPLETE || | |
3277 | skb_csum_unnecessary(skb))) | |
3278 | aux.tp_status |= TP_STATUS_CSUM_VALID; | |
3279 | ||
2472d761 | 3280 | aux.tp_len = origlen; |
ffbc6111 HX |
3281 | aux.tp_snaplen = skb->len; |
3282 | aux.tp_mac = 0; | |
bbe735e4 | 3283 | aux.tp_net = skb_network_offset(skb); |
df8a39de JP |
3284 | if (skb_vlan_tag_present(skb)) { |
3285 | aux.tp_vlan_tci = skb_vlan_tag_get(skb); | |
a0cdfcf3 AW |
3286 | aux.tp_vlan_tpid = ntohs(skb->vlan_proto); |
3287 | aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; | |
a3bcc23e BG |
3288 | } else { |
3289 | aux.tp_vlan_tci = 0; | |
a0cdfcf3 | 3290 | aux.tp_vlan_tpid = 0; |
a3bcc23e | 3291 | } |
ffbc6111 | 3292 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
8dc41944 HX |
3293 | } |
3294 | ||
1da177e4 LT |
3295 | /* |
3296 | * Free or return the buffer as appropriate. Again this | |
3297 | * hides all the races and re-entrancy issues from us. | |
3298 | */ | |
bfd5f4a3 | 3299 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
3300 | |
3301 | out_free: | |
3302 | skb_free_datagram(sk, skb); | |
3303 | out: | |
3304 | return err; | |
3305 | } | |
3306 | ||
1da177e4 LT |
3307 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
3308 | int *uaddr_len, int peer) | |
3309 | { | |
3310 | struct net_device *dev; | |
3311 | struct sock *sk = sock->sk; | |
3312 | ||
3313 | if (peer) | |
3314 | return -EOPNOTSUPP; | |
3315 | ||
3316 | uaddr->sa_family = AF_PACKET; | |
2dc85bf3 | 3317 | memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data)); |
654d1f8a ED |
3318 | rcu_read_lock(); |
3319 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
3320 | if (dev) | |
2dc85bf3 | 3321 | strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data)); |
654d1f8a | 3322 | rcu_read_unlock(); |
1da177e4 LT |
3323 | *uaddr_len = sizeof(*uaddr); |
3324 | ||
3325 | return 0; | |
3326 | } | |
1da177e4 LT |
3327 | |
3328 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
3329 | int *uaddr_len, int peer) | |
3330 | { | |
3331 | struct net_device *dev; | |
3332 | struct sock *sk = sock->sk; | |
3333 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 3334 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
3335 | |
3336 | if (peer) | |
3337 | return -EOPNOTSUPP; | |
3338 | ||
3339 | sll->sll_family = AF_PACKET; | |
3340 | sll->sll_ifindex = po->ifindex; | |
3341 | sll->sll_protocol = po->num; | |
67286640 | 3342 | sll->sll_pkttype = 0; |
654d1f8a ED |
3343 | rcu_read_lock(); |
3344 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
3345 | if (dev) { |
3346 | sll->sll_hatype = dev->type; | |
3347 | sll->sll_halen = dev->addr_len; | |
3348 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
3349 | } else { |
3350 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
3351 | sll->sll_halen = 0; | |
3352 | } | |
654d1f8a | 3353 | rcu_read_unlock(); |
0fb375fb | 3354 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
3355 | |
3356 | return 0; | |
3357 | } | |
3358 | ||
2aeb0b88 WC |
3359 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
3360 | int what) | |
1da177e4 LT |
3361 | { |
3362 | switch (i->type) { | |
3363 | case PACKET_MR_MULTICAST: | |
1162563f JP |
3364 | if (i->alen != dev->addr_len) |
3365 | return -EINVAL; | |
1da177e4 | 3366 | if (what > 0) |
22bedad3 | 3367 | return dev_mc_add(dev, i->addr); |
1da177e4 | 3368 | else |
22bedad3 | 3369 | return dev_mc_del(dev, i->addr); |
1da177e4 LT |
3370 | break; |
3371 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 3372 | return dev_set_promiscuity(dev, what); |
1da177e4 | 3373 | case PACKET_MR_ALLMULTI: |
2aeb0b88 | 3374 | return dev_set_allmulti(dev, what); |
d95ed927 | 3375 | case PACKET_MR_UNICAST: |
1162563f JP |
3376 | if (i->alen != dev->addr_len) |
3377 | return -EINVAL; | |
d95ed927 | 3378 | if (what > 0) |
a748ee24 | 3379 | return dev_uc_add(dev, i->addr); |
d95ed927 | 3380 | else |
a748ee24 | 3381 | return dev_uc_del(dev, i->addr); |
d95ed927 | 3382 | break; |
40d4e3df ED |
3383 | default: |
3384 | break; | |
1da177e4 | 3385 | } |
2aeb0b88 | 3386 | return 0; |
1da177e4 LT |
3387 | } |
3388 | ||
82f17091 FR |
3389 | static void packet_dev_mclist_delete(struct net_device *dev, |
3390 | struct packet_mclist **mlp) | |
1da177e4 | 3391 | { |
82f17091 FR |
3392 | struct packet_mclist *ml; |
3393 | ||
3394 | while ((ml = *mlp) != NULL) { | |
3395 | if (ml->ifindex == dev->ifindex) { | |
3396 | packet_dev_mc(dev, ml, -1); | |
3397 | *mlp = ml->next; | |
3398 | kfree(ml); | |
3399 | } else | |
3400 | mlp = &ml->next; | |
1da177e4 LT |
3401 | } |
3402 | } | |
3403 | ||
0fb375fb | 3404 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
3405 | { |
3406 | struct packet_sock *po = pkt_sk(sk); | |
3407 | struct packet_mclist *ml, *i; | |
3408 | struct net_device *dev; | |
3409 | int err; | |
3410 | ||
3411 | rtnl_lock(); | |
3412 | ||
3413 | err = -ENODEV; | |
3b1e0a65 | 3414 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
3415 | if (!dev) |
3416 | goto done; | |
3417 | ||
3418 | err = -EINVAL; | |
1162563f | 3419 | if (mreq->mr_alen > dev->addr_len) |
1da177e4 LT |
3420 | goto done; |
3421 | ||
3422 | err = -ENOBUFS; | |
8b3a7005 | 3423 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
3424 | if (i == NULL) |
3425 | goto done; | |
3426 | ||
3427 | err = 0; | |
3428 | for (ml = po->mclist; ml; ml = ml->next) { | |
3429 | if (ml->ifindex == mreq->mr_ifindex && | |
3430 | ml->type == mreq->mr_type && | |
3431 | ml->alen == mreq->mr_alen && | |
3432 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
3433 | ml->count++; | |
3434 | /* Free the new element ... */ | |
3435 | kfree(i); | |
3436 | goto done; | |
3437 | } | |
3438 | } | |
3439 | ||
3440 | i->type = mreq->mr_type; | |
3441 | i->ifindex = mreq->mr_ifindex; | |
3442 | i->alen = mreq->mr_alen; | |
3443 | memcpy(i->addr, mreq->mr_address, i->alen); | |
3444 | i->count = 1; | |
3445 | i->next = po->mclist; | |
3446 | po->mclist = i; | |
2aeb0b88 WC |
3447 | err = packet_dev_mc(dev, i, 1); |
3448 | if (err) { | |
3449 | po->mclist = i->next; | |
3450 | kfree(i); | |
3451 | } | |
1da177e4 LT |
3452 | |
3453 | done: | |
3454 | rtnl_unlock(); | |
3455 | return err; | |
3456 | } | |
3457 | ||
0fb375fb | 3458 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
3459 | { |
3460 | struct packet_mclist *ml, **mlp; | |
3461 | ||
3462 | rtnl_lock(); | |
3463 | ||
3464 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
3465 | if (ml->ifindex == mreq->mr_ifindex && | |
3466 | ml->type == mreq->mr_type && | |
3467 | ml->alen == mreq->mr_alen && | |
3468 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
3469 | if (--ml->count == 0) { | |
3470 | struct net_device *dev; | |
3471 | *mlp = ml->next; | |
ad959e76 ED |
3472 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
3473 | if (dev) | |
1da177e4 | 3474 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
3475 | kfree(ml); |
3476 | } | |
82f17091 | 3477 | break; |
1da177e4 LT |
3478 | } |
3479 | } | |
3480 | rtnl_unlock(); | |
82f17091 | 3481 | return 0; |
1da177e4 LT |
3482 | } |
3483 | ||
3484 | static void packet_flush_mclist(struct sock *sk) | |
3485 | { | |
3486 | struct packet_sock *po = pkt_sk(sk); | |
3487 | struct packet_mclist *ml; | |
3488 | ||
3489 | if (!po->mclist) | |
3490 | return; | |
3491 | ||
3492 | rtnl_lock(); | |
3493 | while ((ml = po->mclist) != NULL) { | |
3494 | struct net_device *dev; | |
3495 | ||
3496 | po->mclist = ml->next; | |
ad959e76 ED |
3497 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
3498 | if (dev != NULL) | |
1da177e4 | 3499 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
3500 | kfree(ml); |
3501 | } | |
3502 | rtnl_unlock(); | |
3503 | } | |
1da177e4 LT |
3504 | |
3505 | static int | |
b7058842 | 3506 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
3507 | { |
3508 | struct sock *sk = sock->sk; | |
8dc41944 | 3509 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
3510 | int ret; |
3511 | ||
3512 | if (level != SOL_PACKET) | |
3513 | return -ENOPROTOOPT; | |
3514 | ||
69e3c75f | 3515 | switch (optname) { |
1ce4f28b | 3516 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
3517 | case PACKET_DROP_MEMBERSHIP: |
3518 | { | |
0fb375fb EB |
3519 | struct packet_mreq_max mreq; |
3520 | int len = optlen; | |
3521 | memset(&mreq, 0, sizeof(mreq)); | |
3522 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 3523 | return -EINVAL; |
0fb375fb EB |
3524 | if (len > sizeof(mreq)) |
3525 | len = sizeof(mreq); | |
40d4e3df | 3526 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 3527 | return -EFAULT; |
0fb375fb EB |
3528 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
3529 | return -EINVAL; | |
1da177e4 LT |
3530 | if (optname == PACKET_ADD_MEMBERSHIP) |
3531 | ret = packet_mc_add(sk, &mreq); | |
3532 | else | |
3533 | ret = packet_mc_drop(sk, &mreq); | |
3534 | return ret; | |
3535 | } | |
a2efcfa0 | 3536 | |
1da177e4 | 3537 | case PACKET_RX_RING: |
69e3c75f | 3538 | case PACKET_TX_RING: |
1da177e4 | 3539 | { |
f6fb8f10 | 3540 | union tpacket_req_u req_u; |
3541 | int len; | |
1da177e4 | 3542 | |
f6fb8f10 | 3543 | switch (po->tp_version) { |
3544 | case TPACKET_V1: | |
3545 | case TPACKET_V2: | |
3546 | len = sizeof(req_u.req); | |
3547 | break; | |
3548 | case TPACKET_V3: | |
3549 | default: | |
3550 | len = sizeof(req_u.req3); | |
3551 | break; | |
3552 | } | |
3553 | if (optlen < len) | |
1da177e4 | 3554 | return -EINVAL; |
bfd5f4a3 SS |
3555 | if (pkt_sk(sk)->has_vnet_hdr) |
3556 | return -EINVAL; | |
f6fb8f10 | 3557 | if (copy_from_user(&req_u.req, optval, len)) |
1da177e4 | 3558 | return -EFAULT; |
f6fb8f10 | 3559 | return packet_set_ring(sk, &req_u, 0, |
3560 | optname == PACKET_TX_RING); | |
1da177e4 LT |
3561 | } |
3562 | case PACKET_COPY_THRESH: | |
3563 | { | |
3564 | int val; | |
3565 | ||
40d4e3df | 3566 | if (optlen != sizeof(val)) |
1da177e4 | 3567 | return -EINVAL; |
40d4e3df | 3568 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
3569 | return -EFAULT; |
3570 | ||
3571 | pkt_sk(sk)->copy_thresh = val; | |
3572 | return 0; | |
3573 | } | |
bbd6ef87 PM |
3574 | case PACKET_VERSION: |
3575 | { | |
3576 | int val; | |
3577 | ||
3578 | if (optlen != sizeof(val)) | |
3579 | return -EINVAL; | |
69e3c75f | 3580 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
bbd6ef87 PM |
3581 | return -EBUSY; |
3582 | if (copy_from_user(&val, optval, sizeof(val))) | |
3583 | return -EFAULT; | |
3584 | switch (val) { | |
3585 | case TPACKET_V1: | |
3586 | case TPACKET_V2: | |
f6fb8f10 | 3587 | case TPACKET_V3: |
bbd6ef87 PM |
3588 | po->tp_version = val; |
3589 | return 0; | |
3590 | default: | |
3591 | return -EINVAL; | |
3592 | } | |
3593 | } | |
8913336a PM |
3594 | case PACKET_RESERVE: |
3595 | { | |
3596 | unsigned int val; | |
3597 | ||
3598 | if (optlen != sizeof(val)) | |
3599 | return -EINVAL; | |
69e3c75f | 3600 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
8913336a PM |
3601 | return -EBUSY; |
3602 | if (copy_from_user(&val, optval, sizeof(val))) | |
3603 | return -EFAULT; | |
3604 | po->tp_reserve = val; | |
3605 | return 0; | |
3606 | } | |
69e3c75f JB |
3607 | case PACKET_LOSS: |
3608 | { | |
3609 | unsigned int val; | |
3610 | ||
3611 | if (optlen != sizeof(val)) | |
3612 | return -EINVAL; | |
3613 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3614 | return -EBUSY; | |
3615 | if (copy_from_user(&val, optval, sizeof(val))) | |
3616 | return -EFAULT; | |
3617 | po->tp_loss = !!val; | |
3618 | return 0; | |
3619 | } | |
8dc41944 HX |
3620 | case PACKET_AUXDATA: |
3621 | { | |
3622 | int val; | |
3623 | ||
3624 | if (optlen < sizeof(val)) | |
3625 | return -EINVAL; | |
3626 | if (copy_from_user(&val, optval, sizeof(val))) | |
3627 | return -EFAULT; | |
3628 | ||
3629 | po->auxdata = !!val; | |
3630 | return 0; | |
3631 | } | |
80feaacb PWJ |
3632 | case PACKET_ORIGDEV: |
3633 | { | |
3634 | int val; | |
3635 | ||
3636 | if (optlen < sizeof(val)) | |
3637 | return -EINVAL; | |
3638 | if (copy_from_user(&val, optval, sizeof(val))) | |
3639 | return -EFAULT; | |
3640 | ||
3641 | po->origdev = !!val; | |
3642 | return 0; | |
3643 | } | |
bfd5f4a3 SS |
3644 | case PACKET_VNET_HDR: |
3645 | { | |
3646 | int val; | |
3647 | ||
3648 | if (sock->type != SOCK_RAW) | |
3649 | return -EINVAL; | |
3650 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3651 | return -EBUSY; | |
3652 | if (optlen < sizeof(val)) | |
3653 | return -EINVAL; | |
3654 | if (copy_from_user(&val, optval, sizeof(val))) | |
3655 | return -EFAULT; | |
3656 | ||
3657 | po->has_vnet_hdr = !!val; | |
3658 | return 0; | |
3659 | } | |
614f60fa SM |
3660 | case PACKET_TIMESTAMP: |
3661 | { | |
3662 | int val; | |
3663 | ||
3664 | if (optlen != sizeof(val)) | |
3665 | return -EINVAL; | |
3666 | if (copy_from_user(&val, optval, sizeof(val))) | |
3667 | return -EFAULT; | |
3668 | ||
3669 | po->tp_tstamp = val; | |
3670 | return 0; | |
3671 | } | |
dc99f600 DM |
3672 | case PACKET_FANOUT: |
3673 | { | |
3674 | int val; | |
3675 | ||
3676 | if (optlen != sizeof(val)) | |
3677 | return -EINVAL; | |
3678 | if (copy_from_user(&val, optval, sizeof(val))) | |
3679 | return -EFAULT; | |
3680 | ||
3681 | return fanout_add(sk, val & 0xffff, val >> 16); | |
3682 | } | |
47dceb8e WB |
3683 | case PACKET_FANOUT_DATA: |
3684 | { | |
3685 | if (!po->fanout) | |
3686 | return -EINVAL; | |
3687 | ||
3688 | return fanout_set_data(po, optval, optlen); | |
3689 | } | |
5920cd3a PC |
3690 | case PACKET_TX_HAS_OFF: |
3691 | { | |
3692 | unsigned int val; | |
3693 | ||
3694 | if (optlen != sizeof(val)) | |
3695 | return -EINVAL; | |
3696 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3697 | return -EBUSY; | |
3698 | if (copy_from_user(&val, optval, sizeof(val))) | |
3699 | return -EFAULT; | |
3700 | po->tp_tx_has_off = !!val; | |
3701 | return 0; | |
3702 | } | |
d346a3fa DB |
3703 | case PACKET_QDISC_BYPASS: |
3704 | { | |
3705 | int val; | |
3706 | ||
3707 | if (optlen != sizeof(val)) | |
3708 | return -EINVAL; | |
3709 | if (copy_from_user(&val, optval, sizeof(val))) | |
3710 | return -EFAULT; | |
3711 | ||
3712 | po->xmit = val ? packet_direct_xmit : dev_queue_xmit; | |
3713 | return 0; | |
3714 | } | |
1da177e4 LT |
3715 | default: |
3716 | return -ENOPROTOOPT; | |
3717 | } | |
3718 | } | |
3719 | ||
3720 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
3721 | char __user *optval, int __user *optlen) | |
3722 | { | |
3723 | int len; | |
c06fff6e | 3724 | int val, lv = sizeof(val); |
1da177e4 LT |
3725 | struct sock *sk = sock->sk; |
3726 | struct packet_sock *po = pkt_sk(sk); | |
c06fff6e | 3727 | void *data = &val; |
ee80fbf3 | 3728 | union tpacket_stats_u st; |
a9b63918 | 3729 | struct tpacket_rollover_stats rstats; |
1da177e4 LT |
3730 | |
3731 | if (level != SOL_PACKET) | |
3732 | return -ENOPROTOOPT; | |
3733 | ||
8ae55f04 KK |
3734 | if (get_user(len, optlen)) |
3735 | return -EFAULT; | |
1da177e4 LT |
3736 | |
3737 | if (len < 0) | |
3738 | return -EINVAL; | |
1ce4f28b | 3739 | |
69e3c75f | 3740 | switch (optname) { |
1da177e4 | 3741 | case PACKET_STATISTICS: |
1da177e4 | 3742 | spin_lock_bh(&sk->sk_receive_queue.lock); |
ee80fbf3 DB |
3743 | memcpy(&st, &po->stats, sizeof(st)); |
3744 | memset(&po->stats, 0, sizeof(po->stats)); | |
3745 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
3746 | ||
f6fb8f10 | 3747 | if (po->tp_version == TPACKET_V3) { |
c06fff6e | 3748 | lv = sizeof(struct tpacket_stats_v3); |
8bcdeaff | 3749 | st.stats3.tp_packets += st.stats3.tp_drops; |
ee80fbf3 | 3750 | data = &st.stats3; |
f6fb8f10 | 3751 | } else { |
c06fff6e | 3752 | lv = sizeof(struct tpacket_stats); |
8bcdeaff | 3753 | st.stats1.tp_packets += st.stats1.tp_drops; |
ee80fbf3 | 3754 | data = &st.stats1; |
f6fb8f10 | 3755 | } |
ee80fbf3 | 3756 | |
8dc41944 HX |
3757 | break; |
3758 | case PACKET_AUXDATA: | |
8dc41944 | 3759 | val = po->auxdata; |
80feaacb PWJ |
3760 | break; |
3761 | case PACKET_ORIGDEV: | |
80feaacb | 3762 | val = po->origdev; |
bfd5f4a3 SS |
3763 | break; |
3764 | case PACKET_VNET_HDR: | |
bfd5f4a3 | 3765 | val = po->has_vnet_hdr; |
1da177e4 | 3766 | break; |
bbd6ef87 | 3767 | case PACKET_VERSION: |
bbd6ef87 | 3768 | val = po->tp_version; |
bbd6ef87 PM |
3769 | break; |
3770 | case PACKET_HDRLEN: | |
3771 | if (len > sizeof(int)) | |
3772 | len = sizeof(int); | |
3773 | if (copy_from_user(&val, optval, len)) | |
3774 | return -EFAULT; | |
3775 | switch (val) { | |
3776 | case TPACKET_V1: | |
3777 | val = sizeof(struct tpacket_hdr); | |
3778 | break; | |
3779 | case TPACKET_V2: | |
3780 | val = sizeof(struct tpacket2_hdr); | |
3781 | break; | |
f6fb8f10 | 3782 | case TPACKET_V3: |
3783 | val = sizeof(struct tpacket3_hdr); | |
3784 | break; | |
bbd6ef87 PM |
3785 | default: |
3786 | return -EINVAL; | |
3787 | } | |
bbd6ef87 | 3788 | break; |
8913336a | 3789 | case PACKET_RESERVE: |
8913336a | 3790 | val = po->tp_reserve; |
8913336a | 3791 | break; |
69e3c75f | 3792 | case PACKET_LOSS: |
69e3c75f | 3793 | val = po->tp_loss; |
69e3c75f | 3794 | break; |
614f60fa | 3795 | case PACKET_TIMESTAMP: |
614f60fa | 3796 | val = po->tp_tstamp; |
614f60fa | 3797 | break; |
dc99f600 | 3798 | case PACKET_FANOUT: |
dc99f600 DM |
3799 | val = (po->fanout ? |
3800 | ((u32)po->fanout->id | | |
77f65ebd WB |
3801 | ((u32)po->fanout->type << 16) | |
3802 | ((u32)po->fanout->flags << 24)) : | |
dc99f600 | 3803 | 0); |
dc99f600 | 3804 | break; |
a9b63918 WB |
3805 | case PACKET_ROLLOVER_STATS: |
3806 | if (!po->rollover) | |
3807 | return -EINVAL; | |
3808 | rstats.tp_all = atomic_long_read(&po->rollover->num); | |
3809 | rstats.tp_huge = atomic_long_read(&po->rollover->num_huge); | |
3810 | rstats.tp_failed = atomic_long_read(&po->rollover->num_failed); | |
3811 | data = &rstats; | |
3812 | lv = sizeof(rstats); | |
3813 | break; | |
5920cd3a PC |
3814 | case PACKET_TX_HAS_OFF: |
3815 | val = po->tp_tx_has_off; | |
3816 | break; | |
d346a3fa DB |
3817 | case PACKET_QDISC_BYPASS: |
3818 | val = packet_use_direct_xmit(po); | |
3819 | break; | |
1da177e4 LT |
3820 | default: |
3821 | return -ENOPROTOOPT; | |
3822 | } | |
3823 | ||
c06fff6e ED |
3824 | if (len > lv) |
3825 | len = lv; | |
8ae55f04 KK |
3826 | if (put_user(len, optlen)) |
3827 | return -EFAULT; | |
8dc41944 HX |
3828 | if (copy_to_user(optval, data, len)) |
3829 | return -EFAULT; | |
8ae55f04 | 3830 | return 0; |
1da177e4 LT |
3831 | } |
3832 | ||
3833 | ||
351638e7 JP |
3834 | static int packet_notifier(struct notifier_block *this, |
3835 | unsigned long msg, void *ptr) | |
1da177e4 LT |
3836 | { |
3837 | struct sock *sk; | |
351638e7 | 3838 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3839 | struct net *net = dev_net(dev); |
1da177e4 | 3840 | |
808f5114 | 3841 | rcu_read_lock(); |
b67bfe0d | 3842 | sk_for_each_rcu(sk, &net->packet.sklist) { |
1da177e4 LT |
3843 | struct packet_sock *po = pkt_sk(sk); |
3844 | ||
3845 | switch (msg) { | |
3846 | case NETDEV_UNREGISTER: | |
1da177e4 | 3847 | if (po->mclist) |
82f17091 | 3848 | packet_dev_mclist_delete(dev, &po->mclist); |
a2efcfa0 DM |
3849 | /* fallthrough */ |
3850 | ||
1da177e4 LT |
3851 | case NETDEV_DOWN: |
3852 | if (dev->ifindex == po->ifindex) { | |
3853 | spin_lock(&po->bind_lock); | |
3854 | if (po->running) { | |
ce06b03e | 3855 | __unregister_prot_hook(sk, false); |
1da177e4 LT |
3856 | sk->sk_err = ENETDOWN; |
3857 | if (!sock_flag(sk, SOCK_DEAD)) | |
3858 | sk->sk_error_report(sk); | |
3859 | } | |
3860 | if (msg == NETDEV_UNREGISTER) { | |
66e56cd4 | 3861 | packet_cached_dev_reset(po); |
1da177e4 | 3862 | po->ifindex = -1; |
160ff18a BG |
3863 | if (po->prot_hook.dev) |
3864 | dev_put(po->prot_hook.dev); | |
1da177e4 LT |
3865 | po->prot_hook.dev = NULL; |
3866 | } | |
3867 | spin_unlock(&po->bind_lock); | |
3868 | } | |
3869 | break; | |
3870 | case NETDEV_UP: | |
808f5114 | 3871 | if (dev->ifindex == po->ifindex) { |
3872 | spin_lock(&po->bind_lock); | |
ce06b03e DM |
3873 | if (po->num) |
3874 | register_prot_hook(sk); | |
808f5114 | 3875 | spin_unlock(&po->bind_lock); |
1da177e4 | 3876 | } |
1da177e4 LT |
3877 | break; |
3878 | } | |
3879 | } | |
808f5114 | 3880 | rcu_read_unlock(); |
1da177e4 LT |
3881 | return NOTIFY_DONE; |
3882 | } | |
3883 | ||
3884 | ||
3885 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
3886 | unsigned long arg) | |
3887 | { | |
3888 | struct sock *sk = sock->sk; | |
3889 | ||
69e3c75f | 3890 | switch (cmd) { |
40d4e3df ED |
3891 | case SIOCOUTQ: |
3892 | { | |
3893 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 3894 | |
40d4e3df ED |
3895 | return put_user(amount, (int __user *)arg); |
3896 | } | |
3897 | case SIOCINQ: | |
3898 | { | |
3899 | struct sk_buff *skb; | |
3900 | int amount = 0; | |
3901 | ||
3902 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
3903 | skb = skb_peek(&sk->sk_receive_queue); | |
3904 | if (skb) | |
3905 | amount = skb->len; | |
3906 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
3907 | return put_user(amount, (int __user *)arg); | |
3908 | } | |
3909 | case SIOCGSTAMP: | |
3910 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
3911 | case SIOCGSTAMPNS: | |
3912 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 3913 | |
1da177e4 | 3914 | #ifdef CONFIG_INET |
40d4e3df ED |
3915 | case SIOCADDRT: |
3916 | case SIOCDELRT: | |
3917 | case SIOCDARP: | |
3918 | case SIOCGARP: | |
3919 | case SIOCSARP: | |
3920 | case SIOCGIFADDR: | |
3921 | case SIOCSIFADDR: | |
3922 | case SIOCGIFBRDADDR: | |
3923 | case SIOCSIFBRDADDR: | |
3924 | case SIOCGIFNETMASK: | |
3925 | case SIOCSIFNETMASK: | |
3926 | case SIOCGIFDSTADDR: | |
3927 | case SIOCSIFDSTADDR: | |
3928 | case SIOCSIFFLAGS: | |
40d4e3df | 3929 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
1da177e4 LT |
3930 | #endif |
3931 | ||
40d4e3df ED |
3932 | default: |
3933 | return -ENOIOCTLCMD; | |
1da177e4 LT |
3934 | } |
3935 | return 0; | |
3936 | } | |
3937 | ||
40d4e3df | 3938 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
3939 | poll_table *wait) |
3940 | { | |
3941 | struct sock *sk = sock->sk; | |
3942 | struct packet_sock *po = pkt_sk(sk); | |
3943 | unsigned int mask = datagram_poll(file, sock, wait); | |
3944 | ||
3945 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f | 3946 | if (po->rx_ring.pg_vec) { |
f6fb8f10 | 3947 | if (!packet_previous_rx_frame(po, &po->rx_ring, |
3948 | TP_STATUS_KERNEL)) | |
1da177e4 LT |
3949 | mask |= POLLIN | POLLRDNORM; |
3950 | } | |
2ccdbaa6 | 3951 | if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL) |
54d7c01d | 3952 | po->pressure = 0; |
1da177e4 | 3953 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
69e3c75f JB |
3954 | spin_lock_bh(&sk->sk_write_queue.lock); |
3955 | if (po->tx_ring.pg_vec) { | |
3956 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
3957 | mask |= POLLOUT | POLLWRNORM; | |
3958 | } | |
3959 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
3960 | return mask; |
3961 | } | |
3962 | ||
3963 | ||
3964 | /* Dirty? Well, I still did not learn better way to account | |
3965 | * for user mmaps. | |
3966 | */ | |
3967 | ||
3968 | static void packet_mm_open(struct vm_area_struct *vma) | |
3969 | { | |
3970 | struct file *file = vma->vm_file; | |
40d4e3df | 3971 | struct socket *sock = file->private_data; |
1da177e4 | 3972 | struct sock *sk = sock->sk; |
1ce4f28b | 3973 | |
1da177e4 LT |
3974 | if (sk) |
3975 | atomic_inc(&pkt_sk(sk)->mapped); | |
3976 | } | |
3977 | ||
3978 | static void packet_mm_close(struct vm_area_struct *vma) | |
3979 | { | |
3980 | struct file *file = vma->vm_file; | |
40d4e3df | 3981 | struct socket *sock = file->private_data; |
1da177e4 | 3982 | struct sock *sk = sock->sk; |
1ce4f28b | 3983 | |
1da177e4 LT |
3984 | if (sk) |
3985 | atomic_dec(&pkt_sk(sk)->mapped); | |
3986 | } | |
3987 | ||
f0f37e2f | 3988 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
3989 | .open = packet_mm_open, |
3990 | .close = packet_mm_close, | |
1da177e4 LT |
3991 | }; |
3992 | ||
0e3125c7 NH |
3993 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
3994 | unsigned int len) | |
1da177e4 LT |
3995 | { |
3996 | int i; | |
3997 | ||
4ebf0ae2 | 3998 | for (i = 0; i < len; i++) { |
0e3125c7 | 3999 | if (likely(pg_vec[i].buffer)) { |
c56b4d90 | 4000 | if (is_vmalloc_addr(pg_vec[i].buffer)) |
0e3125c7 NH |
4001 | vfree(pg_vec[i].buffer); |
4002 | else | |
4003 | free_pages((unsigned long)pg_vec[i].buffer, | |
4004 | order); | |
4005 | pg_vec[i].buffer = NULL; | |
4006 | } | |
1da177e4 LT |
4007 | } |
4008 | kfree(pg_vec); | |
4009 | } | |
4010 | ||
eea49cc9 | 4011 | static char *alloc_one_pg_vec_page(unsigned long order) |
4ebf0ae2 | 4012 | { |
f0d4eb29 | 4013 | char *buffer; |
0e3125c7 NH |
4014 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | |
4015 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; | |
4016 | ||
4017 | buffer = (char *) __get_free_pages(gfp_flags, order); | |
0e3125c7 NH |
4018 | if (buffer) |
4019 | return buffer; | |
4020 | ||
f0d4eb29 | 4021 | /* __get_free_pages failed, fall back to vmalloc */ |
bbce5a59 | 4022 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
0e3125c7 NH |
4023 | if (buffer) |
4024 | return buffer; | |
4025 | ||
f0d4eb29 | 4026 | /* vmalloc failed, lets dig into swap here */ |
0e3125c7 | 4027 | gfp_flags &= ~__GFP_NORETRY; |
f0d4eb29 | 4028 | buffer = (char *) __get_free_pages(gfp_flags, order); |
0e3125c7 NH |
4029 | if (buffer) |
4030 | return buffer; | |
4031 | ||
f0d4eb29 | 4032 | /* complete and utter failure */ |
0e3125c7 | 4033 | return NULL; |
4ebf0ae2 DM |
4034 | } |
4035 | ||
0e3125c7 | 4036 | static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
4ebf0ae2 DM |
4037 | { |
4038 | unsigned int block_nr = req->tp_block_nr; | |
0e3125c7 | 4039 | struct pgv *pg_vec; |
4ebf0ae2 DM |
4040 | int i; |
4041 | ||
0e3125c7 | 4042 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
4ebf0ae2 DM |
4043 | if (unlikely(!pg_vec)) |
4044 | goto out; | |
4045 | ||
4046 | for (i = 0; i < block_nr; i++) { | |
c56b4d90 | 4047 | pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
0e3125c7 | 4048 | if (unlikely(!pg_vec[i].buffer)) |
4ebf0ae2 DM |
4049 | goto out_free_pgvec; |
4050 | } | |
4051 | ||
4052 | out: | |
4053 | return pg_vec; | |
4054 | ||
4055 | out_free_pgvec: | |
4056 | free_pg_vec(pg_vec, order, block_nr); | |
4057 | pg_vec = NULL; | |
4058 | goto out; | |
4059 | } | |
1da177e4 | 4060 | |
f6fb8f10 | 4061 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
69e3c75f | 4062 | int closing, int tx_ring) |
1da177e4 | 4063 | { |
0e3125c7 | 4064 | struct pgv *pg_vec = NULL; |
1da177e4 | 4065 | struct packet_sock *po = pkt_sk(sk); |
0e11c91e | 4066 | int was_running, order = 0; |
69e3c75f JB |
4067 | struct packet_ring_buffer *rb; |
4068 | struct sk_buff_head *rb_queue; | |
0e11c91e | 4069 | __be16 num; |
f6fb8f10 | 4070 | int err = -EINVAL; |
4071 | /* Added to avoid minimal code churn */ | |
4072 | struct tpacket_req *req = &req_u->req; | |
4073 | ||
4074 | /* Opening a Tx-ring is NOT supported in TPACKET_V3 */ | |
4075 | if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) { | |
4076 | WARN(1, "Tx-ring is not supported.\n"); | |
4077 | goto out; | |
4078 | } | |
1ce4f28b | 4079 | |
69e3c75f JB |
4080 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
4081 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 4082 | |
69e3c75f JB |
4083 | err = -EBUSY; |
4084 | if (!closing) { | |
4085 | if (atomic_read(&po->mapped)) | |
4086 | goto out; | |
b0138408 | 4087 | if (packet_read_pending(rb)) |
69e3c75f JB |
4088 | goto out; |
4089 | } | |
1da177e4 | 4090 | |
69e3c75f JB |
4091 | if (req->tp_block_nr) { |
4092 | /* Sanity tests and some calculations */ | |
4093 | err = -EBUSY; | |
4094 | if (unlikely(rb->pg_vec)) | |
4095 | goto out; | |
1da177e4 | 4096 | |
bbd6ef87 PM |
4097 | switch (po->tp_version) { |
4098 | case TPACKET_V1: | |
4099 | po->tp_hdrlen = TPACKET_HDRLEN; | |
4100 | break; | |
4101 | case TPACKET_V2: | |
4102 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
4103 | break; | |
f6fb8f10 | 4104 | case TPACKET_V3: |
4105 | po->tp_hdrlen = TPACKET3_HDRLEN; | |
4106 | break; | |
bbd6ef87 PM |
4107 | } |
4108 | ||
69e3c75f | 4109 | err = -EINVAL; |
4ebf0ae2 | 4110 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 4111 | goto out; |
4ebf0ae2 | 4112 | if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
69e3c75f | 4113 | goto out; |
dc808110 ED |
4114 | if (po->tp_version >= TPACKET_V3 && |
4115 | (int)(req->tp_block_size - | |
4116 | BLK_PLUS_PRIV(req_u->req3.tp_sizeof_priv)) <= 0) | |
4117 | goto out; | |
8913336a | 4118 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
4119 | po->tp_reserve)) |
4120 | goto out; | |
4ebf0ae2 | 4121 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 4122 | goto out; |
1da177e4 | 4123 | |
4194b491 TK |
4124 | rb->frames_per_block = req->tp_block_size / req->tp_frame_size; |
4125 | if (unlikely(rb->frames_per_block == 0)) | |
69e3c75f JB |
4126 | goto out; |
4127 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != | |
4128 | req->tp_frame_nr)) | |
4129 | goto out; | |
1da177e4 LT |
4130 | |
4131 | err = -ENOMEM; | |
4ebf0ae2 DM |
4132 | order = get_order(req->tp_block_size); |
4133 | pg_vec = alloc_pg_vec(req, order); | |
4134 | if (unlikely(!pg_vec)) | |
1da177e4 | 4135 | goto out; |
f6fb8f10 | 4136 | switch (po->tp_version) { |
4137 | case TPACKET_V3: | |
4138 | /* Transmit path is not supported. We checked | |
4139 | * it above but just being paranoid | |
4140 | */ | |
4141 | if (!tx_ring) | |
e8e85cc5 | 4142 | init_prb_bdqc(po, rb, pg_vec, req_u); |
d7cf0c34 | 4143 | break; |
f6fb8f10 | 4144 | default: |
4145 | break; | |
4146 | } | |
69e3c75f JB |
4147 | } |
4148 | /* Done */ | |
4149 | else { | |
4150 | err = -EINVAL; | |
4ebf0ae2 | 4151 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 4152 | goto out; |
1da177e4 LT |
4153 | } |
4154 | ||
4155 | lock_sock(sk); | |
4156 | ||
4157 | /* Detach socket from network */ | |
4158 | spin_lock(&po->bind_lock); | |
4159 | was_running = po->running; | |
4160 | num = po->num; | |
4161 | if (was_running) { | |
1da177e4 | 4162 | po->num = 0; |
ce06b03e | 4163 | __unregister_prot_hook(sk, false); |
1da177e4 LT |
4164 | } |
4165 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 4166 | |
1da177e4 LT |
4167 | synchronize_net(); |
4168 | ||
4169 | err = -EBUSY; | |
905db440 | 4170 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
4171 | if (closing || atomic_read(&po->mapped) == 0) { |
4172 | err = 0; | |
69e3c75f | 4173 | spin_lock_bh(&rb_queue->lock); |
c053fd96 | 4174 | swap(rb->pg_vec, pg_vec); |
69e3c75f JB |
4175 | rb->frame_max = (req->tp_frame_nr - 1); |
4176 | rb->head = 0; | |
4177 | rb->frame_size = req->tp_frame_size; | |
4178 | spin_unlock_bh(&rb_queue->lock); | |
4179 | ||
c053fd96 CG |
4180 | swap(rb->pg_vec_order, order); |
4181 | swap(rb->pg_vec_len, req->tp_block_nr); | |
69e3c75f JB |
4182 | |
4183 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
4184 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
4185 | tpacket_rcv : packet_rcv; | |
4186 | skb_queue_purge(rb_queue); | |
1da177e4 | 4187 | if (atomic_read(&po->mapped)) |
40d4e3df ED |
4188 | pr_err("packet_mmap: vma is busy: %d\n", |
4189 | atomic_read(&po->mapped)); | |
1da177e4 | 4190 | } |
905db440 | 4191 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
4192 | |
4193 | spin_lock(&po->bind_lock); | |
ce06b03e | 4194 | if (was_running) { |
1da177e4 | 4195 | po->num = num; |
ce06b03e | 4196 | register_prot_hook(sk); |
1da177e4 LT |
4197 | } |
4198 | spin_unlock(&po->bind_lock); | |
f6fb8f10 | 4199 | if (closing && (po->tp_version > TPACKET_V2)) { |
4200 | /* Because we don't support block-based V3 on tx-ring */ | |
4201 | if (!tx_ring) | |
73d0fcf2 | 4202 | prb_shutdown_retire_blk_timer(po, rb_queue); |
f6fb8f10 | 4203 | } |
1da177e4 LT |
4204 | release_sock(sk); |
4205 | ||
1da177e4 LT |
4206 | if (pg_vec) |
4207 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
4208 | out: | |
4209 | return err; | |
4210 | } | |
4211 | ||
69e3c75f JB |
4212 | static int packet_mmap(struct file *file, struct socket *sock, |
4213 | struct vm_area_struct *vma) | |
1da177e4 LT |
4214 | { |
4215 | struct sock *sk = sock->sk; | |
4216 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
4217 | unsigned long size, expected_size; |
4218 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
4219 | unsigned long start; |
4220 | int err = -EINVAL; | |
4221 | int i; | |
4222 | ||
4223 | if (vma->vm_pgoff) | |
4224 | return -EINVAL; | |
4225 | ||
905db440 | 4226 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
4227 | |
4228 | expected_size = 0; | |
4229 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
4230 | if (rb->pg_vec) { | |
4231 | expected_size += rb->pg_vec_len | |
4232 | * rb->pg_vec_pages | |
4233 | * PAGE_SIZE; | |
4234 | } | |
4235 | } | |
4236 | ||
4237 | if (expected_size == 0) | |
1da177e4 | 4238 | goto out; |
69e3c75f JB |
4239 | |
4240 | size = vma->vm_end - vma->vm_start; | |
4241 | if (size != expected_size) | |
1da177e4 LT |
4242 | goto out; |
4243 | ||
1da177e4 | 4244 | start = vma->vm_start; |
69e3c75f JB |
4245 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
4246 | if (rb->pg_vec == NULL) | |
4247 | continue; | |
4248 | ||
4249 | for (i = 0; i < rb->pg_vec_len; i++) { | |
0e3125c7 NH |
4250 | struct page *page; |
4251 | void *kaddr = rb->pg_vec[i].buffer; | |
69e3c75f JB |
4252 | int pg_num; |
4253 | ||
c56b4d90 CG |
4254 | for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
4255 | page = pgv_to_page(kaddr); | |
69e3c75f JB |
4256 | err = vm_insert_page(vma, start, page); |
4257 | if (unlikely(err)) | |
4258 | goto out; | |
4259 | start += PAGE_SIZE; | |
0e3125c7 | 4260 | kaddr += PAGE_SIZE; |
69e3c75f | 4261 | } |
4ebf0ae2 | 4262 | } |
1da177e4 | 4263 | } |
69e3c75f | 4264 | |
4ebf0ae2 | 4265 | atomic_inc(&po->mapped); |
1da177e4 LT |
4266 | vma->vm_ops = &packet_mmap_ops; |
4267 | err = 0; | |
4268 | ||
4269 | out: | |
905db440 | 4270 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
4271 | return err; |
4272 | } | |
1da177e4 | 4273 | |
90ddc4f0 | 4274 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
4275 | .family = PF_PACKET, |
4276 | .owner = THIS_MODULE, | |
4277 | .release = packet_release, | |
4278 | .bind = packet_bind_spkt, | |
4279 | .connect = sock_no_connect, | |
4280 | .socketpair = sock_no_socketpair, | |
4281 | .accept = sock_no_accept, | |
4282 | .getname = packet_getname_spkt, | |
4283 | .poll = datagram_poll, | |
4284 | .ioctl = packet_ioctl, | |
4285 | .listen = sock_no_listen, | |
4286 | .shutdown = sock_no_shutdown, | |
4287 | .setsockopt = sock_no_setsockopt, | |
4288 | .getsockopt = sock_no_getsockopt, | |
4289 | .sendmsg = packet_sendmsg_spkt, | |
4290 | .recvmsg = packet_recvmsg, | |
4291 | .mmap = sock_no_mmap, | |
4292 | .sendpage = sock_no_sendpage, | |
4293 | }; | |
1da177e4 | 4294 | |
90ddc4f0 | 4295 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
4296 | .family = PF_PACKET, |
4297 | .owner = THIS_MODULE, | |
4298 | .release = packet_release, | |
4299 | .bind = packet_bind, | |
4300 | .connect = sock_no_connect, | |
4301 | .socketpair = sock_no_socketpair, | |
4302 | .accept = sock_no_accept, | |
1ce4f28b | 4303 | .getname = packet_getname, |
1da177e4 LT |
4304 | .poll = packet_poll, |
4305 | .ioctl = packet_ioctl, | |
4306 | .listen = sock_no_listen, | |
4307 | .shutdown = sock_no_shutdown, | |
4308 | .setsockopt = packet_setsockopt, | |
4309 | .getsockopt = packet_getsockopt, | |
4310 | .sendmsg = packet_sendmsg, | |
4311 | .recvmsg = packet_recvmsg, | |
4312 | .mmap = packet_mmap, | |
4313 | .sendpage = sock_no_sendpage, | |
4314 | }; | |
4315 | ||
ec1b4cf7 | 4316 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
4317 | .family = PF_PACKET, |
4318 | .create = packet_create, | |
4319 | .owner = THIS_MODULE, | |
4320 | }; | |
4321 | ||
4322 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 4323 | .notifier_call = packet_notifier, |
1da177e4 LT |
4324 | }; |
4325 | ||
4326 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
4327 | |
4328 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
808f5114 | 4329 | __acquires(RCU) |
1da177e4 | 4330 | { |
e372c414 | 4331 | struct net *net = seq_file_net(seq); |
808f5114 | 4332 | |
4333 | rcu_read_lock(); | |
4334 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); | |
1da177e4 LT |
4335 | } |
4336 | ||
4337 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
4338 | { | |
1bf40954 | 4339 | struct net *net = seq_file_net(seq); |
808f5114 | 4340 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
1da177e4 LT |
4341 | } |
4342 | ||
4343 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
808f5114 | 4344 | __releases(RCU) |
1da177e4 | 4345 | { |
808f5114 | 4346 | rcu_read_unlock(); |
1da177e4 LT |
4347 | } |
4348 | ||
1ce4f28b | 4349 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
4350 | { |
4351 | if (v == SEQ_START_TOKEN) | |
4352 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
4353 | else { | |
b7ceabd9 | 4354 | struct sock *s = sk_entry(v); |
1da177e4 LT |
4355 | const struct packet_sock *po = pkt_sk(s); |
4356 | ||
4357 | seq_printf(seq, | |
71338aa7 | 4358 | "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
1da177e4 LT |
4359 | s, |
4360 | atomic_read(&s->sk_refcnt), | |
4361 | s->sk_type, | |
4362 | ntohs(po->num), | |
4363 | po->ifindex, | |
4364 | po->running, | |
4365 | atomic_read(&s->sk_rmem_alloc), | |
a7cb5a49 | 4366 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)), |
40d4e3df | 4367 | sock_i_ino(s)); |
1da177e4 LT |
4368 | } |
4369 | ||
4370 | return 0; | |
4371 | } | |
4372 | ||
56b3d975 | 4373 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
4374 | .start = packet_seq_start, |
4375 | .next = packet_seq_next, | |
4376 | .stop = packet_seq_stop, | |
4377 | .show = packet_seq_show, | |
4378 | }; | |
4379 | ||
4380 | static int packet_seq_open(struct inode *inode, struct file *file) | |
4381 | { | |
e372c414 DL |
4382 | return seq_open_net(inode, file, &packet_seq_ops, |
4383 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
4384 | } |
4385 | ||
da7071d7 | 4386 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
4387 | .owner = THIS_MODULE, |
4388 | .open = packet_seq_open, | |
4389 | .read = seq_read, | |
4390 | .llseek = seq_lseek, | |
e372c414 | 4391 | .release = seq_release_net, |
1da177e4 LT |
4392 | }; |
4393 | ||
4394 | #endif | |
4395 | ||
2c8c1e72 | 4396 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 4397 | { |
0fa7fa98 | 4398 | mutex_init(&net->packet.sklist_lock); |
2aaef4e4 | 4399 | INIT_HLIST_HEAD(&net->packet.sklist); |
d12d01d6 | 4400 | |
d4beaa66 | 4401 | if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops)) |
d12d01d6 DL |
4402 | return -ENOMEM; |
4403 | ||
4404 | return 0; | |
4405 | } | |
4406 | ||
2c8c1e72 | 4407 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 | 4408 | { |
ece31ffd | 4409 | remove_proc_entry("packet", net->proc_net); |
d12d01d6 DL |
4410 | } |
4411 | ||
4412 | static struct pernet_operations packet_net_ops = { | |
4413 | .init = packet_net_init, | |
4414 | .exit = packet_net_exit, | |
4415 | }; | |
4416 | ||
4417 | ||
1da177e4 LT |
4418 | static void __exit packet_exit(void) |
4419 | { | |
1da177e4 | 4420 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 4421 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
4422 | sock_unregister(PF_PACKET); |
4423 | proto_unregister(&packet_proto); | |
4424 | } | |
4425 | ||
4426 | static int __init packet_init(void) | |
4427 | { | |
4428 | int rc = proto_register(&packet_proto, 0); | |
4429 | ||
4430 | if (rc != 0) | |
4431 | goto out; | |
4432 | ||
4433 | sock_register(&packet_family_ops); | |
d12d01d6 | 4434 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 4435 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
4436 | out: |
4437 | return rc; | |
4438 | } | |
4439 | ||
4440 | module_init(packet_init); | |
4441 | module_exit(packet_exit); | |
4442 | MODULE_LICENSE("GPL"); | |
4443 | MODULE_ALIAS_NETPROTO(PF_PACKET); |