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> | |
7c0f6ba6 | 76 | #include <linux/uaccess.h> |
1da177e4 LT |
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> |
719c44d3 | 96 | #include <net/compat.h> |
1da177e4 | 97 | |
2787b04b PE |
98 | #include "internal.h" |
99 | ||
1da177e4 LT |
100 | /* |
101 | Assumptions: | |
102 | - if device has no dev->hard_header routine, it adds and removes ll header | |
103 | inside itself. In this case ll header is invisible outside of device, | |
104 | but higher levels still should reserve dev->hard_header_len. | |
105 | Some devices are enough clever to reallocate skb, when header | |
106 | will not fit to reserved space (tunnel), another ones are silly | |
107 | (PPP). | |
108 | - packet socket receives packets with pulled ll header, | |
109 | so that SOCK_RAW should push it back. | |
110 | ||
111 | On receive: | |
112 | ----------- | |
113 | ||
114 | Incoming, dev->hard_header!=NULL | |
b0e380b1 ACM |
115 | mac_header -> ll header |
116 | data -> data | |
1da177e4 LT |
117 | |
118 | Outgoing, dev->hard_header!=NULL | |
b0e380b1 ACM |
119 | mac_header -> ll header |
120 | data -> ll header | |
1da177e4 LT |
121 | |
122 | Incoming, dev->hard_header==NULL | |
b0e380b1 ACM |
123 | mac_header -> UNKNOWN position. It is very likely, that it points to ll |
124 | header. PPP makes it, that is wrong, because introduce | |
db0c58f9 | 125 | assymetry between rx and tx paths. |
b0e380b1 | 126 | data -> data |
1da177e4 LT |
127 | |
128 | Outgoing, dev->hard_header==NULL | |
b0e380b1 ACM |
129 | mac_header -> data. ll header is still not built! |
130 | data -> data | |
1da177e4 LT |
131 | |
132 | Resume | |
133 | If dev->hard_header==NULL we are unlikely to restore sensible ll header. | |
134 | ||
135 | ||
136 | On transmit: | |
137 | ------------ | |
138 | ||
139 | dev->hard_header != NULL | |
b0e380b1 ACM |
140 | mac_header -> ll header |
141 | data -> ll header | |
1da177e4 LT |
142 | |
143 | dev->hard_header == NULL (ll header is added by device, we cannot control it) | |
b0e380b1 ACM |
144 | mac_header -> data |
145 | data -> data | |
1da177e4 LT |
146 | |
147 | We should set nh.raw on output to correct posistion, | |
148 | packet classifier depends on it. | |
149 | */ | |
150 | ||
1da177e4 LT |
151 | /* Private packet socket structures. */ |
152 | ||
0fb375fb EB |
153 | /* identical to struct packet_mreq except it has |
154 | * a longer address field. | |
155 | */ | |
40d4e3df | 156 | struct packet_mreq_max { |
0fb375fb EB |
157 | int mr_ifindex; |
158 | unsigned short mr_type; | |
159 | unsigned short mr_alen; | |
160 | unsigned char mr_address[MAX_ADDR_LEN]; | |
1da177e4 | 161 | }; |
a2efcfa0 | 162 | |
184f489e DB |
163 | union tpacket_uhdr { |
164 | struct tpacket_hdr *h1; | |
165 | struct tpacket2_hdr *h2; | |
166 | struct tpacket3_hdr *h3; | |
167 | void *raw; | |
168 | }; | |
169 | ||
f6fb8f10 | 170 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
69e3c75f JB |
171 | int closing, int tx_ring); |
172 | ||
f6fb8f10 | 173 | #define V3_ALIGNMENT (8) |
174 | ||
bc59ba39 | 175 | #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT)) |
f6fb8f10 | 176 | |
177 | #define BLK_PLUS_PRIV(sz_of_priv) \ | |
178 | (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT)) | |
179 | ||
f6fb8f10 | 180 | #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status) |
181 | #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts) | |
182 | #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt) | |
183 | #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len) | |
184 | #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num) | |
185 | #define BLOCK_O2PRIV(x) ((x)->offset_to_priv) | |
186 | #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x))) | |
187 | ||
69e3c75f | 188 | struct packet_sock; |
77f65ebd WB |
189 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
190 | struct packet_type *pt, struct net_device *orig_dev); | |
1da177e4 | 191 | |
f6fb8f10 | 192 | static void *packet_previous_frame(struct packet_sock *po, |
193 | struct packet_ring_buffer *rb, | |
194 | int status); | |
195 | static void packet_increment_head(struct packet_ring_buffer *buff); | |
878cd3ba | 196 | static int prb_curr_blk_in_use(struct tpacket_block_desc *); |
bc59ba39 | 197 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *, |
f6fb8f10 | 198 | struct packet_sock *); |
bc59ba39 | 199 | static void prb_retire_current_block(struct tpacket_kbdq_core *, |
f6fb8f10 | 200 | struct packet_sock *, unsigned int status); |
bc59ba39 | 201 | static int prb_queue_frozen(struct tpacket_kbdq_core *); |
202 | static void prb_open_block(struct tpacket_kbdq_core *, | |
203 | struct tpacket_block_desc *); | |
f6fb8f10 | 204 | static void prb_retire_rx_blk_timer_expired(unsigned long); |
bc59ba39 | 205 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *); |
206 | static void prb_init_blk_timer(struct packet_sock *, | |
207 | struct tpacket_kbdq_core *, | |
208 | void (*func) (unsigned long)); | |
209 | static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *); | |
210 | static void prb_clear_rxhash(struct tpacket_kbdq_core *, | |
211 | struct tpacket3_hdr *); | |
212 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *, | |
213 | struct tpacket3_hdr *); | |
1da177e4 | 214 | static void packet_flush_mclist(struct sock *sk); |
ccd4eb49 | 215 | static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb); |
1da177e4 | 216 | |
ffbc6111 | 217 | struct packet_skb_cb { |
ffbc6111 HX |
218 | union { |
219 | struct sockaddr_pkt pkt; | |
2472d761 EB |
220 | union { |
221 | /* Trick: alias skb original length with | |
222 | * ll.sll_family and ll.protocol in order | |
223 | * to save room. | |
224 | */ | |
225 | unsigned int origlen; | |
226 | struct sockaddr_ll ll; | |
227 | }; | |
ffbc6111 HX |
228 | } sa; |
229 | }; | |
230 | ||
d3869efe DW |
231 | #define vio_le() virtio_legacy_is_little_endian() |
232 | ||
ffbc6111 | 233 | #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
8dc41944 | 234 | |
bc59ba39 | 235 | #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc)) |
f6fb8f10 | 236 | #define GET_PBLOCK_DESC(x, bid) \ |
bc59ba39 | 237 | ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer)) |
f6fb8f10 | 238 | #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \ |
bc59ba39 | 239 | ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer)) |
f6fb8f10 | 240 | #define GET_NEXT_PRB_BLK_NUM(x) \ |
241 | (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \ | |
242 | ((x)->kactive_blk_num+1) : 0) | |
243 | ||
dc99f600 DM |
244 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po); |
245 | static void __fanout_link(struct sock *sk, struct packet_sock *po); | |
246 | ||
d346a3fa DB |
247 | static int packet_direct_xmit(struct sk_buff *skb) |
248 | { | |
249 | struct net_device *dev = skb->dev; | |
104ba78c | 250 | struct sk_buff *orig_skb = skb; |
d346a3fa | 251 | struct netdev_queue *txq; |
43279500 | 252 | int ret = NETDEV_TX_BUSY; |
d346a3fa DB |
253 | |
254 | if (unlikely(!netif_running(dev) || | |
43279500 DB |
255 | !netif_carrier_ok(dev))) |
256 | goto drop; | |
d346a3fa | 257 | |
104ba78c WB |
258 | skb = validate_xmit_skb_list(skb, dev); |
259 | if (skb != orig_skb) | |
43279500 | 260 | goto drop; |
d346a3fa | 261 | |
ccd4eb49 | 262 | packet_pick_tx_queue(dev, skb); |
10c51b56 | 263 | txq = skb_get_tx_queue(dev, skb); |
d346a3fa | 264 | |
43279500 DB |
265 | local_bh_disable(); |
266 | ||
267 | HARD_TX_LOCK(dev, txq, smp_processor_id()); | |
10b3ad8c | 268 | if (!netif_xmit_frozen_or_drv_stopped(txq)) |
fa2dbdc2 | 269 | ret = netdev_start_xmit(skb, dev, txq, false); |
43279500 | 270 | HARD_TX_UNLOCK(dev, txq); |
d346a3fa | 271 | |
43279500 DB |
272 | local_bh_enable(); |
273 | ||
274 | if (!dev_xmit_complete(ret)) | |
d346a3fa | 275 | kfree_skb(skb); |
43279500 | 276 | |
d346a3fa | 277 | return ret; |
43279500 | 278 | drop: |
0f97ede4 | 279 | atomic_long_inc(&dev->tx_dropped); |
104ba78c | 280 | kfree_skb_list(skb); |
43279500 | 281 | return NET_XMIT_DROP; |
d346a3fa DB |
282 | } |
283 | ||
66e56cd4 DB |
284 | static struct net_device *packet_cached_dev_get(struct packet_sock *po) |
285 | { | |
286 | struct net_device *dev; | |
287 | ||
288 | rcu_read_lock(); | |
289 | dev = rcu_dereference(po->cached_dev); | |
290 | if (likely(dev)) | |
291 | dev_hold(dev); | |
292 | rcu_read_unlock(); | |
293 | ||
294 | return dev; | |
295 | } | |
296 | ||
297 | static void packet_cached_dev_assign(struct packet_sock *po, | |
298 | struct net_device *dev) | |
299 | { | |
300 | rcu_assign_pointer(po->cached_dev, dev); | |
301 | } | |
302 | ||
303 | static void packet_cached_dev_reset(struct packet_sock *po) | |
304 | { | |
305 | RCU_INIT_POINTER(po->cached_dev, NULL); | |
306 | } | |
307 | ||
d346a3fa DB |
308 | static bool packet_use_direct_xmit(const struct packet_sock *po) |
309 | { | |
310 | return po->xmit == packet_direct_xmit; | |
311 | } | |
312 | ||
0fd5d57b | 313 | static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb) |
d346a3fa | 314 | { |
1cbac010 | 315 | return (u16) raw_smp_processor_id() % dev->real_num_tx_queues; |
d346a3fa DB |
316 | } |
317 | ||
0fd5d57b DB |
318 | static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb) |
319 | { | |
320 | const struct net_device_ops *ops = dev->netdev_ops; | |
321 | u16 queue_index; | |
322 | ||
323 | if (ops->ndo_select_queue) { | |
324 | queue_index = ops->ndo_select_queue(dev, skb, NULL, | |
325 | __packet_pick_tx_queue); | |
326 | queue_index = netdev_cap_txqueue(dev, queue_index); | |
327 | } else { | |
328 | queue_index = __packet_pick_tx_queue(dev, skb); | |
329 | } | |
330 | ||
331 | skb_set_queue_mapping(skb, queue_index); | |
332 | } | |
333 | ||
ce06b03e DM |
334 | /* register_prot_hook must be invoked with the po->bind_lock held, |
335 | * or from a context in which asynchronous accesses to the packet | |
336 | * socket is not possible (packet_create()). | |
337 | */ | |
338 | static void register_prot_hook(struct sock *sk) | |
339 | { | |
340 | struct packet_sock *po = pkt_sk(sk); | |
e40526cb | 341 | |
ce06b03e | 342 | if (!po->running) { |
66e56cd4 | 343 | if (po->fanout) |
dc99f600 | 344 | __fanout_link(sk, po); |
66e56cd4 | 345 | else |
dc99f600 | 346 | dev_add_pack(&po->prot_hook); |
e40526cb | 347 | |
ce06b03e DM |
348 | sock_hold(sk); |
349 | po->running = 1; | |
350 | } | |
351 | } | |
352 | ||
353 | /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock | |
354 | * held. If the sync parameter is true, we will temporarily drop | |
355 | * the po->bind_lock and do a synchronize_net to make sure no | |
356 | * asynchronous packet processing paths still refer to the elements | |
357 | * of po->prot_hook. If the sync parameter is false, it is the | |
358 | * callers responsibility to take care of this. | |
359 | */ | |
360 | static void __unregister_prot_hook(struct sock *sk, bool sync) | |
361 | { | |
362 | struct packet_sock *po = pkt_sk(sk); | |
363 | ||
364 | po->running = 0; | |
66e56cd4 DB |
365 | |
366 | if (po->fanout) | |
dc99f600 | 367 | __fanout_unlink(sk, po); |
66e56cd4 | 368 | else |
dc99f600 | 369 | __dev_remove_pack(&po->prot_hook); |
e40526cb | 370 | |
ce06b03e DM |
371 | __sock_put(sk); |
372 | ||
373 | if (sync) { | |
374 | spin_unlock(&po->bind_lock); | |
375 | synchronize_net(); | |
376 | spin_lock(&po->bind_lock); | |
377 | } | |
378 | } | |
379 | ||
380 | static void unregister_prot_hook(struct sock *sk, bool sync) | |
381 | { | |
382 | struct packet_sock *po = pkt_sk(sk); | |
383 | ||
384 | if (po->running) | |
385 | __unregister_prot_hook(sk, sync); | |
386 | } | |
387 | ||
6e58040b | 388 | static inline struct page * __pure pgv_to_page(void *addr) |
0af55bb5 CG |
389 | { |
390 | if (is_vmalloc_addr(addr)) | |
391 | return vmalloc_to_page(addr); | |
392 | return virt_to_page(addr); | |
393 | } | |
394 | ||
69e3c75f | 395 | static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
1da177e4 | 396 | { |
184f489e | 397 | union tpacket_uhdr h; |
1da177e4 | 398 | |
69e3c75f | 399 | h.raw = frame; |
bbd6ef87 PM |
400 | switch (po->tp_version) { |
401 | case TPACKET_V1: | |
69e3c75f | 402 | h.h1->tp_status = status; |
0af55bb5 | 403 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
bbd6ef87 PM |
404 | break; |
405 | case TPACKET_V2: | |
69e3c75f | 406 | h.h2->tp_status = status; |
0af55bb5 | 407 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
bbd6ef87 | 408 | break; |
f6fb8f10 | 409 | case TPACKET_V3: |
7f953ab2 SV |
410 | h.h3->tp_status = status; |
411 | flush_dcache_page(pgv_to_page(&h.h3->tp_status)); | |
412 | break; | |
69e3c75f | 413 | default: |
f6fb8f10 | 414 | WARN(1, "TPACKET version not supported.\n"); |
69e3c75f | 415 | BUG(); |
bbd6ef87 | 416 | } |
69e3c75f JB |
417 | |
418 | smp_wmb(); | |
bbd6ef87 PM |
419 | } |
420 | ||
69e3c75f | 421 | static int __packet_get_status(struct packet_sock *po, void *frame) |
bbd6ef87 | 422 | { |
184f489e | 423 | union tpacket_uhdr h; |
bbd6ef87 | 424 | |
69e3c75f JB |
425 | smp_rmb(); |
426 | ||
bbd6ef87 PM |
427 | h.raw = frame; |
428 | switch (po->tp_version) { | |
429 | case TPACKET_V1: | |
0af55bb5 | 430 | flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
69e3c75f | 431 | return h.h1->tp_status; |
bbd6ef87 | 432 | case TPACKET_V2: |
0af55bb5 | 433 | flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
69e3c75f | 434 | return h.h2->tp_status; |
f6fb8f10 | 435 | case TPACKET_V3: |
7f953ab2 SV |
436 | flush_dcache_page(pgv_to_page(&h.h3->tp_status)); |
437 | return h.h3->tp_status; | |
69e3c75f | 438 | default: |
f6fb8f10 | 439 | WARN(1, "TPACKET version not supported.\n"); |
69e3c75f JB |
440 | BUG(); |
441 | return 0; | |
bbd6ef87 | 442 | } |
1da177e4 | 443 | } |
69e3c75f | 444 | |
b9c32fb2 DB |
445 | static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts, |
446 | unsigned int flags) | |
7a51384c DB |
447 | { |
448 | struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); | |
449 | ||
68a360e8 WB |
450 | if (shhwtstamps && |
451 | (flags & SOF_TIMESTAMPING_RAW_HARDWARE) && | |
452 | ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts)) | |
453 | return TP_STATUS_TS_RAW_HARDWARE; | |
7a51384c DB |
454 | |
455 | if (ktime_to_timespec_cond(skb->tstamp, ts)) | |
b9c32fb2 | 456 | return TP_STATUS_TS_SOFTWARE; |
7a51384c | 457 | |
b9c32fb2 | 458 | return 0; |
7a51384c DB |
459 | } |
460 | ||
b9c32fb2 DB |
461 | static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame, |
462 | struct sk_buff *skb) | |
2e31396f WB |
463 | { |
464 | union tpacket_uhdr h; | |
465 | struct timespec ts; | |
b9c32fb2 | 466 | __u32 ts_status; |
2e31396f | 467 | |
b9c32fb2 DB |
468 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
469 | return 0; | |
2e31396f WB |
470 | |
471 | h.raw = frame; | |
472 | switch (po->tp_version) { | |
473 | case TPACKET_V1: | |
474 | h.h1->tp_sec = ts.tv_sec; | |
475 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; | |
476 | break; | |
477 | case TPACKET_V2: | |
478 | h.h2->tp_sec = ts.tv_sec; | |
479 | h.h2->tp_nsec = ts.tv_nsec; | |
480 | break; | |
481 | case TPACKET_V3: | |
57ea884b DB |
482 | h.h3->tp_sec = ts.tv_sec; |
483 | h.h3->tp_nsec = ts.tv_nsec; | |
484 | break; | |
2e31396f WB |
485 | default: |
486 | WARN(1, "TPACKET version not supported.\n"); | |
487 | BUG(); | |
488 | } | |
489 | ||
490 | /* one flush is safe, as both fields always lie on the same cacheline */ | |
491 | flush_dcache_page(pgv_to_page(&h.h1->tp_sec)); | |
492 | smp_wmb(); | |
b9c32fb2 DB |
493 | |
494 | return ts_status; | |
2e31396f WB |
495 | } |
496 | ||
69e3c75f JB |
497 | static void *packet_lookup_frame(struct packet_sock *po, |
498 | struct packet_ring_buffer *rb, | |
499 | unsigned int position, | |
500 | int status) | |
501 | { | |
502 | unsigned int pg_vec_pos, frame_offset; | |
184f489e | 503 | union tpacket_uhdr h; |
69e3c75f JB |
504 | |
505 | pg_vec_pos = position / rb->frames_per_block; | |
506 | frame_offset = position % rb->frames_per_block; | |
507 | ||
0e3125c7 NH |
508 | h.raw = rb->pg_vec[pg_vec_pos].buffer + |
509 | (frame_offset * rb->frame_size); | |
69e3c75f JB |
510 | |
511 | if (status != __packet_get_status(po, h.raw)) | |
512 | return NULL; | |
513 | ||
514 | return h.raw; | |
515 | } | |
516 | ||
eea49cc9 | 517 | static void *packet_current_frame(struct packet_sock *po, |
69e3c75f JB |
518 | struct packet_ring_buffer *rb, |
519 | int status) | |
520 | { | |
521 | return packet_lookup_frame(po, rb, rb->head, status); | |
522 | } | |
523 | ||
bc59ba39 | 524 | static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 525 | { |
526 | del_timer_sync(&pkc->retire_blk_timer); | |
527 | } | |
528 | ||
529 | static void prb_shutdown_retire_blk_timer(struct packet_sock *po, | |
f6fb8f10 | 530 | struct sk_buff_head *rb_queue) |
531 | { | |
bc59ba39 | 532 | struct tpacket_kbdq_core *pkc; |
f6fb8f10 | 533 | |
73d0fcf2 | 534 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 535 | |
ec6f809f | 536 | spin_lock_bh(&rb_queue->lock); |
f6fb8f10 | 537 | pkc->delete_blk_timer = 1; |
ec6f809f | 538 | spin_unlock_bh(&rb_queue->lock); |
f6fb8f10 | 539 | |
540 | prb_del_retire_blk_timer(pkc); | |
541 | } | |
542 | ||
543 | static void prb_init_blk_timer(struct packet_sock *po, | |
bc59ba39 | 544 | struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 545 | void (*func) (unsigned long)) |
546 | { | |
547 | init_timer(&pkc->retire_blk_timer); | |
548 | pkc->retire_blk_timer.data = (long)po; | |
549 | pkc->retire_blk_timer.function = func; | |
550 | pkc->retire_blk_timer.expires = jiffies; | |
551 | } | |
552 | ||
e8e85cc5 | 553 | static void prb_setup_retire_blk_timer(struct packet_sock *po) |
f6fb8f10 | 554 | { |
bc59ba39 | 555 | struct tpacket_kbdq_core *pkc; |
f6fb8f10 | 556 | |
e8e85cc5 | 557 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 558 | prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired); |
559 | } | |
560 | ||
561 | static int prb_calc_retire_blk_tmo(struct packet_sock *po, | |
562 | int blk_size_in_bytes) | |
563 | { | |
564 | struct net_device *dev; | |
565 | unsigned int mbits = 0, msec = 0, div = 0, tmo = 0; | |
7cad1bac | 566 | struct ethtool_link_ksettings ecmd; |
4bc71cb9 | 567 | int err; |
f6fb8f10 | 568 | |
4bc71cb9 JP |
569 | rtnl_lock(); |
570 | dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex); | |
571 | if (unlikely(!dev)) { | |
572 | rtnl_unlock(); | |
f6fb8f10 | 573 | return DEFAULT_PRB_RETIRE_TOV; |
4bc71cb9 | 574 | } |
7cad1bac | 575 | err = __ethtool_get_link_ksettings(dev, &ecmd); |
4bc71cb9 JP |
576 | rtnl_unlock(); |
577 | if (!err) { | |
4bc71cb9 JP |
578 | /* |
579 | * If the link speed is so slow you don't really | |
580 | * need to worry about perf anyways | |
581 | */ | |
7cad1bac DD |
582 | if (ecmd.base.speed < SPEED_1000 || |
583 | ecmd.base.speed == SPEED_UNKNOWN) { | |
4bc71cb9 | 584 | return DEFAULT_PRB_RETIRE_TOV; |
e440cf2c | 585 | } else { |
586 | msec = 1; | |
7cad1bac | 587 | div = ecmd.base.speed / 1000; |
f6fb8f10 | 588 | } |
589 | } | |
590 | ||
591 | mbits = (blk_size_in_bytes * 8) / (1024 * 1024); | |
592 | ||
593 | if (div) | |
594 | mbits /= div; | |
595 | ||
596 | tmo = mbits * msec; | |
597 | ||
598 | if (div) | |
599 | return tmo+1; | |
600 | return tmo; | |
601 | } | |
602 | ||
bc59ba39 | 603 | static void prb_init_ft_ops(struct tpacket_kbdq_core *p1, |
f6fb8f10 | 604 | union tpacket_req_u *req_u) |
605 | { | |
606 | p1->feature_req_word = req_u->req3.tp_feature_req_word; | |
607 | } | |
608 | ||
609 | static void init_prb_bdqc(struct packet_sock *po, | |
610 | struct packet_ring_buffer *rb, | |
611 | struct pgv *pg_vec, | |
e8e85cc5 | 612 | union tpacket_req_u *req_u) |
f6fb8f10 | 613 | { |
22781a5b | 614 | struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb); |
bc59ba39 | 615 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 616 | |
617 | memset(p1, 0x0, sizeof(*p1)); | |
618 | ||
619 | p1->knxt_seq_num = 1; | |
620 | p1->pkbdq = pg_vec; | |
bc59ba39 | 621 | pbd = (struct tpacket_block_desc *)pg_vec[0].buffer; |
e3192690 | 622 | p1->pkblk_start = pg_vec[0].buffer; |
f6fb8f10 | 623 | p1->kblk_size = req_u->req3.tp_block_size; |
624 | p1->knum_blocks = req_u->req3.tp_block_nr; | |
625 | p1->hdrlen = po->tp_hdrlen; | |
626 | p1->version = po->tp_version; | |
627 | p1->last_kactive_blk_num = 0; | |
ee80fbf3 | 628 | po->stats.stats3.tp_freeze_q_cnt = 0; |
f6fb8f10 | 629 | if (req_u->req3.tp_retire_blk_tov) |
630 | p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov; | |
631 | else | |
632 | p1->retire_blk_tov = prb_calc_retire_blk_tmo(po, | |
633 | req_u->req3.tp_block_size); | |
634 | p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov); | |
635 | p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv; | |
636 | ||
dc808110 | 637 | p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv); |
f6fb8f10 | 638 | prb_init_ft_ops(p1, req_u); |
e8e85cc5 | 639 | prb_setup_retire_blk_timer(po); |
f6fb8f10 | 640 | prb_open_block(p1, pbd); |
641 | } | |
642 | ||
643 | /* Do NOT update the last_blk_num first. | |
644 | * Assumes sk_buff_head lock is held. | |
645 | */ | |
bc59ba39 | 646 | static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 647 | { |
648 | mod_timer(&pkc->retire_blk_timer, | |
649 | jiffies + pkc->tov_in_jiffies); | |
650 | pkc->last_kactive_blk_num = pkc->kactive_blk_num; | |
651 | } | |
652 | ||
653 | /* | |
654 | * Timer logic: | |
655 | * 1) We refresh the timer only when we open a block. | |
656 | * By doing this we don't waste cycles refreshing the timer | |
657 | * on packet-by-packet basis. | |
658 | * | |
659 | * With a 1MB block-size, on a 1Gbps line, it will take | |
660 | * i) ~8 ms to fill a block + ii) memcpy etc. | |
661 | * In this cut we are not accounting for the memcpy time. | |
662 | * | |
663 | * So, if the user sets the 'tmo' to 10ms then the timer | |
664 | * will never fire while the block is still getting filled | |
665 | * (which is what we want). However, the user could choose | |
666 | * to close a block early and that's fine. | |
667 | * | |
668 | * But when the timer does fire, we check whether or not to refresh it. | |
669 | * Since the tmo granularity is in msecs, it is not too expensive | |
670 | * to refresh the timer, lets say every '8' msecs. | |
671 | * Either the user can set the 'tmo' or we can derive it based on | |
672 | * a) line-speed and b) block-size. | |
673 | * prb_calc_retire_blk_tmo() calculates the tmo. | |
674 | * | |
675 | */ | |
676 | static void prb_retire_rx_blk_timer_expired(unsigned long data) | |
677 | { | |
678 | struct packet_sock *po = (struct packet_sock *)data; | |
22781a5b | 679 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 680 | unsigned int frozen; |
bc59ba39 | 681 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 682 | |
683 | spin_lock(&po->sk.sk_receive_queue.lock); | |
684 | ||
685 | frozen = prb_queue_frozen(pkc); | |
686 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
687 | ||
688 | if (unlikely(pkc->delete_blk_timer)) | |
689 | goto out; | |
690 | ||
691 | /* We only need to plug the race when the block is partially filled. | |
692 | * tpacket_rcv: | |
693 | * lock(); increment BLOCK_NUM_PKTS; unlock() | |
694 | * copy_bits() is in progress ... | |
695 | * timer fires on other cpu: | |
696 | * we can't retire the current block because copy_bits | |
697 | * is in progress. | |
698 | * | |
699 | */ | |
700 | if (BLOCK_NUM_PKTS(pbd)) { | |
701 | while (atomic_read(&pkc->blk_fill_in_prog)) { | |
702 | /* Waiting for skb_copy_bits to finish... */ | |
703 | cpu_relax(); | |
704 | } | |
705 | } | |
706 | ||
707 | if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) { | |
708 | if (!frozen) { | |
41a50d62 AD |
709 | if (!BLOCK_NUM_PKTS(pbd)) { |
710 | /* An empty block. Just refresh the timer. */ | |
711 | goto refresh_timer; | |
712 | } | |
f6fb8f10 | 713 | prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO); |
714 | if (!prb_dispatch_next_block(pkc, po)) | |
715 | goto refresh_timer; | |
716 | else | |
717 | goto out; | |
718 | } else { | |
719 | /* Case 1. Queue was frozen because user-space was | |
720 | * lagging behind. | |
721 | */ | |
878cd3ba | 722 | if (prb_curr_blk_in_use(pbd)) { |
f6fb8f10 | 723 | /* |
724 | * Ok, user-space is still behind. | |
725 | * So just refresh the timer. | |
726 | */ | |
727 | goto refresh_timer; | |
728 | } else { | |
729 | /* Case 2. queue was frozen,user-space caught up, | |
730 | * now the link went idle && the timer fired. | |
731 | * We don't have a block to close.So we open this | |
732 | * block and restart the timer. | |
733 | * opening a block thaws the queue,restarts timer | |
734 | * Thawing/timer-refresh is a side effect. | |
735 | */ | |
736 | prb_open_block(pkc, pbd); | |
737 | goto out; | |
738 | } | |
739 | } | |
740 | } | |
741 | ||
742 | refresh_timer: | |
743 | _prb_refresh_rx_retire_blk_timer(pkc); | |
744 | ||
745 | out: | |
746 | spin_unlock(&po->sk.sk_receive_queue.lock); | |
747 | } | |
748 | ||
eea49cc9 | 749 | static void prb_flush_block(struct tpacket_kbdq_core *pkc1, |
bc59ba39 | 750 | struct tpacket_block_desc *pbd1, __u32 status) |
f6fb8f10 | 751 | { |
752 | /* Flush everything minus the block header */ | |
753 | ||
754 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 | |
755 | u8 *start, *end; | |
756 | ||
757 | start = (u8 *)pbd1; | |
758 | ||
759 | /* Skip the block header(we know header WILL fit in 4K) */ | |
760 | start += PAGE_SIZE; | |
761 | ||
762 | end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end); | |
763 | for (; start < end; start += PAGE_SIZE) | |
764 | flush_dcache_page(pgv_to_page(start)); | |
765 | ||
766 | smp_wmb(); | |
767 | #endif | |
768 | ||
769 | /* Now update the block status. */ | |
770 | ||
771 | BLOCK_STATUS(pbd1) = status; | |
772 | ||
773 | /* Flush the block header */ | |
774 | ||
775 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 | |
776 | start = (u8 *)pbd1; | |
777 | flush_dcache_page(pgv_to_page(start)); | |
778 | ||
779 | smp_wmb(); | |
780 | #endif | |
781 | } | |
782 | ||
783 | /* | |
784 | * Side effect: | |
785 | * | |
786 | * 1) flush the block | |
787 | * 2) Increment active_blk_num | |
788 | * | |
789 | * Note:We DONT refresh the timer on purpose. | |
790 | * Because almost always the next block will be opened. | |
791 | */ | |
bc59ba39 | 792 | static void prb_close_block(struct tpacket_kbdq_core *pkc1, |
793 | struct tpacket_block_desc *pbd1, | |
f6fb8f10 | 794 | struct packet_sock *po, unsigned int stat) |
795 | { | |
796 | __u32 status = TP_STATUS_USER | stat; | |
797 | ||
798 | struct tpacket3_hdr *last_pkt; | |
bc59ba39 | 799 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
da413eec | 800 | struct sock *sk = &po->sk; |
f6fb8f10 | 801 | |
ee80fbf3 | 802 | if (po->stats.stats3.tp_drops) |
f6fb8f10 | 803 | status |= TP_STATUS_LOSING; |
804 | ||
805 | last_pkt = (struct tpacket3_hdr *)pkc1->prev; | |
806 | last_pkt->tp_next_offset = 0; | |
807 | ||
808 | /* Get the ts of the last pkt */ | |
809 | if (BLOCK_NUM_PKTS(pbd1)) { | |
810 | h1->ts_last_pkt.ts_sec = last_pkt->tp_sec; | |
811 | h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec; | |
812 | } else { | |
41a50d62 AD |
813 | /* Ok, we tmo'd - so get the current time. |
814 | * | |
815 | * It shouldn't really happen as we don't close empty | |
816 | * blocks. See prb_retire_rx_blk_timer_expired(). | |
817 | */ | |
f6fb8f10 | 818 | struct timespec ts; |
819 | getnstimeofday(&ts); | |
820 | h1->ts_last_pkt.ts_sec = ts.tv_sec; | |
821 | h1->ts_last_pkt.ts_nsec = ts.tv_nsec; | |
822 | } | |
823 | ||
824 | smp_wmb(); | |
825 | ||
826 | /* Flush the block */ | |
827 | prb_flush_block(pkc1, pbd1, status); | |
828 | ||
da413eec DC |
829 | sk->sk_data_ready(sk); |
830 | ||
f6fb8f10 | 831 | pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1); |
832 | } | |
833 | ||
eea49cc9 | 834 | static void prb_thaw_queue(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 835 | { |
836 | pkc->reset_pending_on_curr_blk = 0; | |
837 | } | |
838 | ||
839 | /* | |
840 | * Side effect of opening a block: | |
841 | * | |
842 | * 1) prb_queue is thawed. | |
843 | * 2) retire_blk_timer is refreshed. | |
844 | * | |
845 | */ | |
bc59ba39 | 846 | static void prb_open_block(struct tpacket_kbdq_core *pkc1, |
847 | struct tpacket_block_desc *pbd1) | |
f6fb8f10 | 848 | { |
849 | struct timespec ts; | |
bc59ba39 | 850 | struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
f6fb8f10 | 851 | |
852 | smp_rmb(); | |
853 | ||
8da3056c DB |
854 | /* We could have just memset this but we will lose the |
855 | * flexibility of making the priv area sticky | |
856 | */ | |
f6fb8f10 | 857 | |
8da3056c DB |
858 | BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++; |
859 | BLOCK_NUM_PKTS(pbd1) = 0; | |
860 | BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
f6fb8f10 | 861 | |
8da3056c DB |
862 | getnstimeofday(&ts); |
863 | ||
864 | h1->ts_first_pkt.ts_sec = ts.tv_sec; | |
865 | h1->ts_first_pkt.ts_nsec = ts.tv_nsec; | |
f6fb8f10 | 866 | |
8da3056c DB |
867 | pkc1->pkblk_start = (char *)pbd1; |
868 | pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
869 | ||
870 | BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); | |
871 | BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN; | |
872 | ||
873 | pbd1->version = pkc1->version; | |
874 | pkc1->prev = pkc1->nxt_offset; | |
875 | pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size; | |
876 | ||
877 | prb_thaw_queue(pkc1); | |
878 | _prb_refresh_rx_retire_blk_timer(pkc1); | |
879 | ||
880 | smp_wmb(); | |
f6fb8f10 | 881 | } |
882 | ||
883 | /* | |
884 | * Queue freeze logic: | |
885 | * 1) Assume tp_block_nr = 8 blocks. | |
886 | * 2) At time 't0', user opens Rx ring. | |
887 | * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7 | |
888 | * 4) user-space is either sleeping or processing block '0'. | |
889 | * 5) tpacket_rcv is currently filling block '7', since there is no space left, | |
890 | * it will close block-7,loop around and try to fill block '0'. | |
891 | * call-flow: | |
892 | * __packet_lookup_frame_in_block | |
893 | * prb_retire_current_block() | |
894 | * prb_dispatch_next_block() | |
895 | * |->(BLOCK_STATUS == USER) evaluates to true | |
896 | * 5.1) Since block-0 is currently in-use, we just freeze the queue. | |
897 | * 6) Now there are two cases: | |
898 | * 6.1) Link goes idle right after the queue is frozen. | |
899 | * But remember, the last open_block() refreshed the timer. | |
900 | * When this timer expires,it will refresh itself so that we can | |
901 | * re-open block-0 in near future. | |
902 | * 6.2) Link is busy and keeps on receiving packets. This is a simple | |
903 | * case and __packet_lookup_frame_in_block will check if block-0 | |
904 | * is free and can now be re-used. | |
905 | */ | |
eea49cc9 | 906 | static void prb_freeze_queue(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 907 | struct packet_sock *po) |
908 | { | |
909 | pkc->reset_pending_on_curr_blk = 1; | |
ee80fbf3 | 910 | po->stats.stats3.tp_freeze_q_cnt++; |
f6fb8f10 | 911 | } |
912 | ||
913 | #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT)) | |
914 | ||
915 | /* | |
916 | * If the next block is free then we will dispatch it | |
917 | * and return a good offset. | |
918 | * Else, we will freeze the queue. | |
919 | * So, caller must check the return value. | |
920 | */ | |
bc59ba39 | 921 | static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 922 | struct packet_sock *po) |
923 | { | |
bc59ba39 | 924 | struct tpacket_block_desc *pbd; |
f6fb8f10 | 925 | |
926 | smp_rmb(); | |
927 | ||
928 | /* 1. Get current block num */ | |
929 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
930 | ||
931 | /* 2. If this block is currently in_use then freeze the queue */ | |
932 | if (TP_STATUS_USER & BLOCK_STATUS(pbd)) { | |
933 | prb_freeze_queue(pkc, po); | |
934 | return NULL; | |
935 | } | |
936 | ||
937 | /* | |
938 | * 3. | |
939 | * open this block and return the offset where the first packet | |
940 | * needs to get stored. | |
941 | */ | |
942 | prb_open_block(pkc, pbd); | |
943 | return (void *)pkc->nxt_offset; | |
944 | } | |
945 | ||
bc59ba39 | 946 | static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 947 | struct packet_sock *po, unsigned int status) |
948 | { | |
bc59ba39 | 949 | struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
f6fb8f10 | 950 | |
951 | /* retire/close the current block */ | |
952 | if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) { | |
953 | /* | |
954 | * Plug the case where copy_bits() is in progress on | |
955 | * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't | |
956 | * have space to copy the pkt in the current block and | |
957 | * called prb_retire_current_block() | |
958 | * | |
959 | * We don't need to worry about the TMO case because | |
960 | * the timer-handler already handled this case. | |
961 | */ | |
962 | if (!(status & TP_STATUS_BLK_TMO)) { | |
963 | while (atomic_read(&pkc->blk_fill_in_prog)) { | |
964 | /* Waiting for skb_copy_bits to finish... */ | |
965 | cpu_relax(); | |
966 | } | |
967 | } | |
968 | prb_close_block(pkc, pbd, po, status); | |
969 | return; | |
970 | } | |
f6fb8f10 | 971 | } |
972 | ||
878cd3ba | 973 | static int prb_curr_blk_in_use(struct tpacket_block_desc *pbd) |
f6fb8f10 | 974 | { |
975 | return TP_STATUS_USER & BLOCK_STATUS(pbd); | |
976 | } | |
977 | ||
eea49cc9 | 978 | static int prb_queue_frozen(struct tpacket_kbdq_core *pkc) |
f6fb8f10 | 979 | { |
980 | return pkc->reset_pending_on_curr_blk; | |
981 | } | |
982 | ||
eea49cc9 | 983 | static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb) |
f6fb8f10 | 984 | { |
bc59ba39 | 985 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
f6fb8f10 | 986 | atomic_dec(&pkc->blk_fill_in_prog); |
987 | } | |
988 | ||
eea49cc9 | 989 | static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 990 | struct tpacket3_hdr *ppd) |
991 | { | |
3958afa1 | 992 | ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb); |
f6fb8f10 | 993 | } |
994 | ||
eea49cc9 | 995 | static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 996 | struct tpacket3_hdr *ppd) |
997 | { | |
998 | ppd->hv1.tp_rxhash = 0; | |
999 | } | |
1000 | ||
eea49cc9 | 1001 | static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 1002 | struct tpacket3_hdr *ppd) |
1003 | { | |
df8a39de JP |
1004 | if (skb_vlan_tag_present(pkc->skb)) { |
1005 | ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb); | |
a0cdfcf3 AW |
1006 | ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto); |
1007 | ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; | |
f6fb8f10 | 1008 | } else { |
9e67030a | 1009 | ppd->hv1.tp_vlan_tci = 0; |
a0cdfcf3 | 1010 | ppd->hv1.tp_vlan_tpid = 0; |
9e67030a | 1011 | ppd->tp_status = TP_STATUS_AVAILABLE; |
f6fb8f10 | 1012 | } |
1013 | } | |
1014 | ||
bc59ba39 | 1015 | static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc, |
f6fb8f10 | 1016 | struct tpacket3_hdr *ppd) |
1017 | { | |
a0cdfcf3 | 1018 | ppd->hv1.tp_padding = 0; |
f6fb8f10 | 1019 | prb_fill_vlan_info(pkc, ppd); |
1020 | ||
1021 | if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH) | |
1022 | prb_fill_rxhash(pkc, ppd); | |
1023 | else | |
1024 | prb_clear_rxhash(pkc, ppd); | |
1025 | } | |
1026 | ||
eea49cc9 | 1027 | static void prb_fill_curr_block(char *curr, |
bc59ba39 | 1028 | struct tpacket_kbdq_core *pkc, |
1029 | struct tpacket_block_desc *pbd, | |
f6fb8f10 | 1030 | unsigned int len) |
1031 | { | |
1032 | struct tpacket3_hdr *ppd; | |
1033 | ||
1034 | ppd = (struct tpacket3_hdr *)curr; | |
1035 | ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len); | |
1036 | pkc->prev = curr; | |
1037 | pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len); | |
1038 | BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len); | |
1039 | BLOCK_NUM_PKTS(pbd) += 1; | |
1040 | atomic_inc(&pkc->blk_fill_in_prog); | |
1041 | prb_run_all_ft_ops(pkc, ppd); | |
1042 | } | |
1043 | ||
1044 | /* Assumes caller has the sk->rx_queue.lock */ | |
1045 | static void *__packet_lookup_frame_in_block(struct packet_sock *po, | |
1046 | struct sk_buff *skb, | |
1047 | int status, | |
1048 | unsigned int len | |
1049 | ) | |
1050 | { | |
bc59ba39 | 1051 | struct tpacket_kbdq_core *pkc; |
1052 | struct tpacket_block_desc *pbd; | |
f6fb8f10 | 1053 | char *curr, *end; |
1054 | ||
e3192690 | 1055 | pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
f6fb8f10 | 1056 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
1057 | ||
1058 | /* Queue is frozen when user space is lagging behind */ | |
1059 | if (prb_queue_frozen(pkc)) { | |
1060 | /* | |
1061 | * Check if that last block which caused the queue to freeze, | |
1062 | * is still in_use by user-space. | |
1063 | */ | |
878cd3ba | 1064 | if (prb_curr_blk_in_use(pbd)) { |
f6fb8f10 | 1065 | /* Can't record this packet */ |
1066 | return NULL; | |
1067 | } else { | |
1068 | /* | |
1069 | * Ok, the block was released by user-space. | |
1070 | * Now let's open that block. | |
1071 | * opening a block also thaws the queue. | |
1072 | * Thawing is a side effect. | |
1073 | */ | |
1074 | prb_open_block(pkc, pbd); | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | smp_mb(); | |
1079 | curr = pkc->nxt_offset; | |
1080 | pkc->skb = skb; | |
e3192690 | 1081 | end = (char *)pbd + pkc->kblk_size; |
f6fb8f10 | 1082 | |
1083 | /* first try the current block */ | |
1084 | if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) { | |
1085 | prb_fill_curr_block(curr, pkc, pbd, len); | |
1086 | return (void *)curr; | |
1087 | } | |
1088 | ||
1089 | /* Ok, close the current block */ | |
1090 | prb_retire_current_block(pkc, po, 0); | |
1091 | ||
1092 | /* Now, try to dispatch the next block */ | |
1093 | curr = (char *)prb_dispatch_next_block(pkc, po); | |
1094 | if (curr) { | |
1095 | pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); | |
1096 | prb_fill_curr_block(curr, pkc, pbd, len); | |
1097 | return (void *)curr; | |
1098 | } | |
1099 | ||
1100 | /* | |
1101 | * No free blocks are available.user_space hasn't caught up yet. | |
1102 | * Queue was just frozen and now this packet will get dropped. | |
1103 | */ | |
1104 | return NULL; | |
1105 | } | |
1106 | ||
eea49cc9 | 1107 | static void *packet_current_rx_frame(struct packet_sock *po, |
f6fb8f10 | 1108 | struct sk_buff *skb, |
1109 | int status, unsigned int len) | |
1110 | { | |
1111 | char *curr = NULL; | |
1112 | switch (po->tp_version) { | |
1113 | case TPACKET_V1: | |
1114 | case TPACKET_V2: | |
1115 | curr = packet_lookup_frame(po, &po->rx_ring, | |
1116 | po->rx_ring.head, status); | |
1117 | return curr; | |
1118 | case TPACKET_V3: | |
1119 | return __packet_lookup_frame_in_block(po, skb, status, len); | |
1120 | default: | |
1121 | WARN(1, "TPACKET version not supported\n"); | |
1122 | BUG(); | |
99aa3473 | 1123 | return NULL; |
f6fb8f10 | 1124 | } |
1125 | } | |
1126 | ||
eea49cc9 | 1127 | static void *prb_lookup_block(struct packet_sock *po, |
f6fb8f10 | 1128 | struct packet_ring_buffer *rb, |
77f65ebd | 1129 | unsigned int idx, |
f6fb8f10 | 1130 | int status) |
1131 | { | |
bc59ba39 | 1132 | struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
77f65ebd | 1133 | struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx); |
f6fb8f10 | 1134 | |
1135 | if (status != BLOCK_STATUS(pbd)) | |
1136 | return NULL; | |
1137 | return pbd; | |
1138 | } | |
1139 | ||
eea49cc9 | 1140 | static int prb_previous_blk_num(struct packet_ring_buffer *rb) |
f6fb8f10 | 1141 | { |
1142 | unsigned int prev; | |
1143 | if (rb->prb_bdqc.kactive_blk_num) | |
1144 | prev = rb->prb_bdqc.kactive_blk_num-1; | |
1145 | else | |
1146 | prev = rb->prb_bdqc.knum_blocks-1; | |
1147 | return prev; | |
1148 | } | |
1149 | ||
1150 | /* Assumes caller has held the rx_queue.lock */ | |
eea49cc9 | 1151 | static void *__prb_previous_block(struct packet_sock *po, |
f6fb8f10 | 1152 | struct packet_ring_buffer *rb, |
1153 | int status) | |
1154 | { | |
1155 | unsigned int previous = prb_previous_blk_num(rb); | |
1156 | return prb_lookup_block(po, rb, previous, status); | |
1157 | } | |
1158 | ||
eea49cc9 | 1159 | static void *packet_previous_rx_frame(struct packet_sock *po, |
f6fb8f10 | 1160 | struct packet_ring_buffer *rb, |
1161 | int status) | |
1162 | { | |
1163 | if (po->tp_version <= TPACKET_V2) | |
1164 | return packet_previous_frame(po, rb, status); | |
1165 | ||
1166 | return __prb_previous_block(po, rb, status); | |
1167 | } | |
1168 | ||
eea49cc9 | 1169 | static void packet_increment_rx_head(struct packet_sock *po, |
f6fb8f10 | 1170 | struct packet_ring_buffer *rb) |
1171 | { | |
1172 | switch (po->tp_version) { | |
1173 | case TPACKET_V1: | |
1174 | case TPACKET_V2: | |
1175 | return packet_increment_head(rb); | |
1176 | case TPACKET_V3: | |
1177 | default: | |
1178 | WARN(1, "TPACKET version not supported.\n"); | |
1179 | BUG(); | |
1180 | return; | |
1181 | } | |
1182 | } | |
1183 | ||
eea49cc9 | 1184 | static void *packet_previous_frame(struct packet_sock *po, |
69e3c75f JB |
1185 | struct packet_ring_buffer *rb, |
1186 | int status) | |
1187 | { | |
1188 | unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; | |
1189 | return packet_lookup_frame(po, rb, previous, status); | |
1190 | } | |
1191 | ||
eea49cc9 | 1192 | static void packet_increment_head(struct packet_ring_buffer *buff) |
69e3c75f JB |
1193 | { |
1194 | buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; | |
1195 | } | |
1196 | ||
b0138408 DB |
1197 | static void packet_inc_pending(struct packet_ring_buffer *rb) |
1198 | { | |
1199 | this_cpu_inc(*rb->pending_refcnt); | |
1200 | } | |
1201 | ||
1202 | static void packet_dec_pending(struct packet_ring_buffer *rb) | |
1203 | { | |
1204 | this_cpu_dec(*rb->pending_refcnt); | |
1205 | } | |
1206 | ||
1207 | static unsigned int packet_read_pending(const struct packet_ring_buffer *rb) | |
1208 | { | |
1209 | unsigned int refcnt = 0; | |
1210 | int cpu; | |
1211 | ||
1212 | /* We don't use pending refcount in rx_ring. */ | |
1213 | if (rb->pending_refcnt == NULL) | |
1214 | return 0; | |
1215 | ||
1216 | for_each_possible_cpu(cpu) | |
1217 | refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu); | |
1218 | ||
1219 | return refcnt; | |
1220 | } | |
1221 | ||
1222 | static int packet_alloc_pending(struct packet_sock *po) | |
1223 | { | |
1224 | po->rx_ring.pending_refcnt = NULL; | |
1225 | ||
1226 | po->tx_ring.pending_refcnt = alloc_percpu(unsigned int); | |
1227 | if (unlikely(po->tx_ring.pending_refcnt == NULL)) | |
1228 | return -ENOBUFS; | |
1229 | ||
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | static void packet_free_pending(struct packet_sock *po) | |
1234 | { | |
1235 | free_percpu(po->tx_ring.pending_refcnt); | |
1236 | } | |
1237 | ||
9954729b WB |
1238 | #define ROOM_POW_OFF 2 |
1239 | #define ROOM_NONE 0x0 | |
1240 | #define ROOM_LOW 0x1 | |
1241 | #define ROOM_NORMAL 0x2 | |
1242 | ||
1243 | static bool __tpacket_has_room(struct packet_sock *po, int pow_off) | |
77f65ebd | 1244 | { |
9954729b WB |
1245 | int idx, len; |
1246 | ||
1247 | len = po->rx_ring.frame_max + 1; | |
1248 | idx = po->rx_ring.head; | |
1249 | if (pow_off) | |
1250 | idx += len >> pow_off; | |
1251 | if (idx >= len) | |
1252 | idx -= len; | |
1253 | return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL); | |
1254 | } | |
1255 | ||
1256 | static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off) | |
1257 | { | |
1258 | int idx, len; | |
1259 | ||
1260 | len = po->rx_ring.prb_bdqc.knum_blocks; | |
1261 | idx = po->rx_ring.prb_bdqc.kactive_blk_num; | |
1262 | if (pow_off) | |
1263 | idx += len >> pow_off; | |
1264 | if (idx >= len) | |
1265 | idx -= len; | |
1266 | return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL); | |
1267 | } | |
77f65ebd | 1268 | |
2ccdbaa6 | 1269 | static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) |
9954729b WB |
1270 | { |
1271 | struct sock *sk = &po->sk; | |
1272 | int ret = ROOM_NONE; | |
1273 | ||
1274 | if (po->prot_hook.func != tpacket_rcv) { | |
1275 | int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc) | |
2ccdbaa6 | 1276 | - (skb ? skb->truesize : 0); |
9954729b WB |
1277 | if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF)) |
1278 | return ROOM_NORMAL; | |
1279 | else if (avail > 0) | |
1280 | return ROOM_LOW; | |
1281 | else | |
1282 | return ROOM_NONE; | |
1283 | } | |
77f65ebd | 1284 | |
9954729b WB |
1285 | if (po->tp_version == TPACKET_V3) { |
1286 | if (__tpacket_v3_has_room(po, ROOM_POW_OFF)) | |
1287 | ret = ROOM_NORMAL; | |
1288 | else if (__tpacket_v3_has_room(po, 0)) | |
1289 | ret = ROOM_LOW; | |
1290 | } else { | |
1291 | if (__tpacket_has_room(po, ROOM_POW_OFF)) | |
1292 | ret = ROOM_NORMAL; | |
1293 | else if (__tpacket_has_room(po, 0)) | |
1294 | ret = ROOM_LOW; | |
1295 | } | |
2ccdbaa6 WB |
1296 | |
1297 | return ret; | |
1298 | } | |
1299 | ||
1300 | static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) | |
1301 | { | |
1302 | int ret; | |
1303 | bool has_room; | |
1304 | ||
54d7c01d WB |
1305 | spin_lock_bh(&po->sk.sk_receive_queue.lock); |
1306 | ret = __packet_rcv_has_room(po, skb); | |
2ccdbaa6 WB |
1307 | has_room = ret == ROOM_NORMAL; |
1308 | if (po->pressure == has_room) | |
54d7c01d WB |
1309 | po->pressure = !has_room; |
1310 | spin_unlock_bh(&po->sk.sk_receive_queue.lock); | |
77f65ebd | 1311 | |
9954729b | 1312 | return ret; |
77f65ebd WB |
1313 | } |
1314 | ||
1da177e4 LT |
1315 | static void packet_sock_destruct(struct sock *sk) |
1316 | { | |
ed85b565 RC |
1317 | skb_queue_purge(&sk->sk_error_queue); |
1318 | ||
547b792c | 1319 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
14afee4b | 1320 | WARN_ON(refcount_read(&sk->sk_wmem_alloc)); |
1da177e4 LT |
1321 | |
1322 | if (!sock_flag(sk, SOCK_DEAD)) { | |
40d4e3df | 1323 | pr_err("Attempt to release alive packet socket: %p\n", sk); |
1da177e4 LT |
1324 | return; |
1325 | } | |
1326 | ||
17ab56a2 | 1327 | sk_refcnt_debug_dec(sk); |
1da177e4 LT |
1328 | } |
1329 | ||
3b3a5b0a WB |
1330 | static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb) |
1331 | { | |
1332 | u32 rxhash; | |
1333 | int i, count = 0; | |
1334 | ||
1335 | rxhash = skb_get_hash(skb); | |
1336 | for (i = 0; i < ROLLOVER_HLEN; i++) | |
1337 | if (po->rollover->history[i] == rxhash) | |
1338 | count++; | |
1339 | ||
1340 | po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash; | |
1341 | return count > (ROLLOVER_HLEN >> 1); | |
1342 | } | |
1343 | ||
77f65ebd WB |
1344 | static unsigned int fanout_demux_hash(struct packet_fanout *f, |
1345 | struct sk_buff *skb, | |
1346 | unsigned int num) | |
dc99f600 | 1347 | { |
eb70db87 | 1348 | return reciprocal_scale(__skb_get_hash_symmetric(skb), num); |
dc99f600 DM |
1349 | } |
1350 | ||
77f65ebd WB |
1351 | static unsigned int fanout_demux_lb(struct packet_fanout *f, |
1352 | struct sk_buff *skb, | |
1353 | unsigned int num) | |
dc99f600 | 1354 | { |
468479e6 | 1355 | unsigned int val = atomic_inc_return(&f->rr_cur); |
dc99f600 | 1356 | |
468479e6 | 1357 | return val % num; |
77f65ebd WB |
1358 | } |
1359 | ||
1360 | static unsigned int fanout_demux_cpu(struct packet_fanout *f, | |
1361 | struct sk_buff *skb, | |
1362 | unsigned int num) | |
1363 | { | |
1364 | return smp_processor_id() % num; | |
dc99f600 DM |
1365 | } |
1366 | ||
5df0ddfb DB |
1367 | static unsigned int fanout_demux_rnd(struct packet_fanout *f, |
1368 | struct sk_buff *skb, | |
1369 | unsigned int num) | |
1370 | { | |
f337db64 | 1371 | return prandom_u32_max(num); |
5df0ddfb DB |
1372 | } |
1373 | ||
77f65ebd WB |
1374 | static unsigned int fanout_demux_rollover(struct packet_fanout *f, |
1375 | struct sk_buff *skb, | |
ad377cab | 1376 | unsigned int idx, bool try_self, |
77f65ebd | 1377 | unsigned int num) |
95ec3eb4 | 1378 | { |
4633c9e0 | 1379 | struct packet_sock *po, *po_next, *po_skip = NULL; |
a9b63918 | 1380 | unsigned int i, j, room = ROOM_NONE; |
95ec3eb4 | 1381 | |
0648ab70 | 1382 | po = pkt_sk(f->arr[idx]); |
3b3a5b0a WB |
1383 | |
1384 | if (try_self) { | |
1385 | room = packet_rcv_has_room(po, skb); | |
1386 | if (room == ROOM_NORMAL || | |
1387 | (room == ROOM_LOW && !fanout_flow_is_huge(po, skb))) | |
1388 | return idx; | |
4633c9e0 | 1389 | po_skip = po; |
3b3a5b0a | 1390 | } |
ad377cab | 1391 | |
0648ab70 | 1392 | i = j = min_t(int, po->rollover->sock, num - 1); |
77f65ebd | 1393 | do { |
2ccdbaa6 | 1394 | po_next = pkt_sk(f->arr[i]); |
4633c9e0 | 1395 | if (po_next != po_skip && !po_next->pressure && |
2ccdbaa6 | 1396 | packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) { |
77f65ebd | 1397 | if (i != j) |
0648ab70 | 1398 | po->rollover->sock = i; |
a9b63918 WB |
1399 | atomic_long_inc(&po->rollover->num); |
1400 | if (room == ROOM_LOW) | |
1401 | atomic_long_inc(&po->rollover->num_huge); | |
77f65ebd WB |
1402 | return i; |
1403 | } | |
ad377cab | 1404 | |
77f65ebd WB |
1405 | if (++i == num) |
1406 | i = 0; | |
1407 | } while (i != j); | |
1408 | ||
a9b63918 | 1409 | atomic_long_inc(&po->rollover->num_failed); |
77f65ebd WB |
1410 | return idx; |
1411 | } | |
1412 | ||
2d36097d NH |
1413 | static unsigned int fanout_demux_qm(struct packet_fanout *f, |
1414 | struct sk_buff *skb, | |
1415 | unsigned int num) | |
1416 | { | |
1417 | return skb_get_queue_mapping(skb) % num; | |
1418 | } | |
1419 | ||
47dceb8e WB |
1420 | static unsigned int fanout_demux_bpf(struct packet_fanout *f, |
1421 | struct sk_buff *skb, | |
1422 | unsigned int num) | |
1423 | { | |
1424 | struct bpf_prog *prog; | |
1425 | unsigned int ret = 0; | |
1426 | ||
1427 | rcu_read_lock(); | |
1428 | prog = rcu_dereference(f->bpf_prog); | |
1429 | if (prog) | |
ff936a04 | 1430 | ret = bpf_prog_run_clear_cb(prog, skb) % num; |
47dceb8e WB |
1431 | rcu_read_unlock(); |
1432 | ||
1433 | return ret; | |
1434 | } | |
1435 | ||
77f65ebd WB |
1436 | static bool fanout_has_flag(struct packet_fanout *f, u16 flag) |
1437 | { | |
1438 | return f->flags & (flag >> 8); | |
95ec3eb4 DM |
1439 | } |
1440 | ||
95ec3eb4 DM |
1441 | static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, |
1442 | struct packet_type *pt, struct net_device *orig_dev) | |
dc99f600 DM |
1443 | { |
1444 | struct packet_fanout *f = pt->af_packet_priv; | |
f98f4514 | 1445 | unsigned int num = READ_ONCE(f->num_members); |
19bcf9f2 | 1446 | struct net *net = read_pnet(&f->net); |
dc99f600 | 1447 | struct packet_sock *po; |
77f65ebd | 1448 | unsigned int idx; |
dc99f600 | 1449 | |
19bcf9f2 | 1450 | if (!net_eq(dev_net(dev), net) || !num) { |
dc99f600 DM |
1451 | kfree_skb(skb); |
1452 | return 0; | |
1453 | } | |
1454 | ||
3f34b24a | 1455 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) { |
19bcf9f2 | 1456 | skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET); |
3f34b24a AD |
1457 | if (!skb) |
1458 | return 0; | |
1459 | } | |
95ec3eb4 DM |
1460 | switch (f->type) { |
1461 | case PACKET_FANOUT_HASH: | |
1462 | default: | |
77f65ebd | 1463 | idx = fanout_demux_hash(f, skb, num); |
95ec3eb4 DM |
1464 | break; |
1465 | case PACKET_FANOUT_LB: | |
77f65ebd | 1466 | idx = fanout_demux_lb(f, skb, num); |
95ec3eb4 DM |
1467 | break; |
1468 | case PACKET_FANOUT_CPU: | |
77f65ebd WB |
1469 | idx = fanout_demux_cpu(f, skb, num); |
1470 | break; | |
5df0ddfb DB |
1471 | case PACKET_FANOUT_RND: |
1472 | idx = fanout_demux_rnd(f, skb, num); | |
1473 | break; | |
2d36097d NH |
1474 | case PACKET_FANOUT_QM: |
1475 | idx = fanout_demux_qm(f, skb, num); | |
1476 | break; | |
77f65ebd | 1477 | case PACKET_FANOUT_ROLLOVER: |
ad377cab | 1478 | idx = fanout_demux_rollover(f, skb, 0, false, num); |
95ec3eb4 | 1479 | break; |
47dceb8e | 1480 | case PACKET_FANOUT_CBPF: |
f2e52095 | 1481 | case PACKET_FANOUT_EBPF: |
47dceb8e WB |
1482 | idx = fanout_demux_bpf(f, skb, num); |
1483 | break; | |
dc99f600 DM |
1484 | } |
1485 | ||
ad377cab WB |
1486 | if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER)) |
1487 | idx = fanout_demux_rollover(f, skb, idx, true, num); | |
dc99f600 | 1488 | |
ad377cab | 1489 | po = pkt_sk(f->arr[idx]); |
dc99f600 DM |
1490 | return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev); |
1491 | } | |
1492 | ||
fff3321d PE |
1493 | DEFINE_MUTEX(fanout_mutex); |
1494 | EXPORT_SYMBOL_GPL(fanout_mutex); | |
dc99f600 | 1495 | static LIST_HEAD(fanout_list); |
4a69a864 | 1496 | static u16 fanout_next_id; |
dc99f600 DM |
1497 | |
1498 | static void __fanout_link(struct sock *sk, struct packet_sock *po) | |
1499 | { | |
1500 | struct packet_fanout *f = po->fanout; | |
1501 | ||
1502 | spin_lock(&f->lock); | |
1503 | f->arr[f->num_members] = sk; | |
1504 | smp_wmb(); | |
1505 | f->num_members++; | |
2bd624b4 AS |
1506 | if (f->num_members == 1) |
1507 | dev_add_pack(&f->prot_hook); | |
dc99f600 DM |
1508 | spin_unlock(&f->lock); |
1509 | } | |
1510 | ||
1511 | static void __fanout_unlink(struct sock *sk, struct packet_sock *po) | |
1512 | { | |
1513 | struct packet_fanout *f = po->fanout; | |
1514 | int i; | |
1515 | ||
1516 | spin_lock(&f->lock); | |
1517 | for (i = 0; i < f->num_members; i++) { | |
1518 | if (f->arr[i] == sk) | |
1519 | break; | |
1520 | } | |
1521 | BUG_ON(i >= f->num_members); | |
1522 | f->arr[i] = f->arr[f->num_members - 1]; | |
1523 | f->num_members--; | |
2bd624b4 AS |
1524 | if (f->num_members == 0) |
1525 | __dev_remove_pack(&f->prot_hook); | |
dc99f600 DM |
1526 | spin_unlock(&f->lock); |
1527 | } | |
1528 | ||
d4dd8aee | 1529 | static bool match_fanout_group(struct packet_type *ptype, struct sock *sk) |
c0de08d0 | 1530 | { |
161642e2 ED |
1531 | if (sk->sk_family != PF_PACKET) |
1532 | return false; | |
c0de08d0 | 1533 | |
161642e2 | 1534 | return ptype->af_packet_priv == pkt_sk(sk)->fanout; |
c0de08d0 EL |
1535 | } |
1536 | ||
47dceb8e WB |
1537 | static void fanout_init_data(struct packet_fanout *f) |
1538 | { | |
1539 | switch (f->type) { | |
1540 | case PACKET_FANOUT_LB: | |
1541 | atomic_set(&f->rr_cur, 0); | |
1542 | break; | |
1543 | case PACKET_FANOUT_CBPF: | |
f2e52095 | 1544 | case PACKET_FANOUT_EBPF: |
47dceb8e WB |
1545 | RCU_INIT_POINTER(f->bpf_prog, NULL); |
1546 | break; | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new) | |
1551 | { | |
1552 | struct bpf_prog *old; | |
1553 | ||
1554 | spin_lock(&f->lock); | |
1555 | old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock)); | |
1556 | rcu_assign_pointer(f->bpf_prog, new); | |
1557 | spin_unlock(&f->lock); | |
1558 | ||
1559 | if (old) { | |
1560 | synchronize_net(); | |
1561 | bpf_prog_destroy(old); | |
1562 | } | |
1563 | } | |
1564 | ||
1565 | static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data, | |
1566 | unsigned int len) | |
1567 | { | |
1568 | struct bpf_prog *new; | |
1569 | struct sock_fprog fprog; | |
1570 | int ret; | |
1571 | ||
1572 | if (sock_flag(&po->sk, SOCK_FILTER_LOCKED)) | |
1573 | return -EPERM; | |
1574 | if (len != sizeof(fprog)) | |
1575 | return -EINVAL; | |
1576 | if (copy_from_user(&fprog, data, len)) | |
1577 | return -EFAULT; | |
1578 | ||
bab18991 | 1579 | ret = bpf_prog_create_from_user(&new, &fprog, NULL, false); |
47dceb8e WB |
1580 | if (ret) |
1581 | return ret; | |
1582 | ||
1583 | __fanout_set_data_bpf(po->fanout, new); | |
1584 | return 0; | |
1585 | } | |
1586 | ||
f2e52095 WB |
1587 | static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data, |
1588 | unsigned int len) | |
1589 | { | |
1590 | struct bpf_prog *new; | |
1591 | u32 fd; | |
1592 | ||
1593 | if (sock_flag(&po->sk, SOCK_FILTER_LOCKED)) | |
1594 | return -EPERM; | |
1595 | if (len != sizeof(fd)) | |
1596 | return -EINVAL; | |
1597 | if (copy_from_user(&fd, data, len)) | |
1598 | return -EFAULT; | |
1599 | ||
113214be | 1600 | new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER); |
f2e52095 WB |
1601 | if (IS_ERR(new)) |
1602 | return PTR_ERR(new); | |
f2e52095 WB |
1603 | |
1604 | __fanout_set_data_bpf(po->fanout, new); | |
1605 | return 0; | |
1606 | } | |
1607 | ||
47dceb8e WB |
1608 | static int fanout_set_data(struct packet_sock *po, char __user *data, |
1609 | unsigned int len) | |
1610 | { | |
1611 | switch (po->fanout->type) { | |
1612 | case PACKET_FANOUT_CBPF: | |
1613 | return fanout_set_data_cbpf(po, data, len); | |
f2e52095 WB |
1614 | case PACKET_FANOUT_EBPF: |
1615 | return fanout_set_data_ebpf(po, data, len); | |
47dceb8e WB |
1616 | default: |
1617 | return -EINVAL; | |
1618 | }; | |
1619 | } | |
1620 | ||
1621 | static void fanout_release_data(struct packet_fanout *f) | |
1622 | { | |
1623 | switch (f->type) { | |
1624 | case PACKET_FANOUT_CBPF: | |
f2e52095 | 1625 | case PACKET_FANOUT_EBPF: |
47dceb8e WB |
1626 | __fanout_set_data_bpf(f, NULL); |
1627 | }; | |
1628 | } | |
1629 | ||
4a69a864 MM |
1630 | static bool __fanout_id_is_free(struct sock *sk, u16 candidate_id) |
1631 | { | |
1632 | struct packet_fanout *f; | |
1633 | ||
1634 | list_for_each_entry(f, &fanout_list, list) { | |
1635 | if (f->id == candidate_id && | |
1636 | read_pnet(&f->net) == sock_net(sk)) { | |
1637 | return false; | |
1638 | } | |
1639 | } | |
1640 | return true; | |
1641 | } | |
1642 | ||
1643 | static bool fanout_find_new_id(struct sock *sk, u16 *new_id) | |
1644 | { | |
1645 | u16 id = fanout_next_id; | |
1646 | ||
1647 | do { | |
1648 | if (__fanout_id_is_free(sk, id)) { | |
1649 | *new_id = id; | |
1650 | fanout_next_id = id + 1; | |
1651 | return true; | |
1652 | } | |
1653 | ||
1654 | id++; | |
1655 | } while (id != fanout_next_id); | |
1656 | ||
1657 | return false; | |
1658 | } | |
1659 | ||
7736d33f | 1660 | static int fanout_add(struct sock *sk, u16 id, u16 type_flags) |
dc99f600 | 1661 | { |
d199fab6 | 1662 | struct packet_rollover *rollover = NULL; |
dc99f600 DM |
1663 | struct packet_sock *po = pkt_sk(sk); |
1664 | struct packet_fanout *f, *match; | |
7736d33f | 1665 | u8 type = type_flags & 0xff; |
77f65ebd | 1666 | u8 flags = type_flags >> 8; |
dc99f600 DM |
1667 | int err; |
1668 | ||
1669 | switch (type) { | |
77f65ebd WB |
1670 | case PACKET_FANOUT_ROLLOVER: |
1671 | if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER) | |
1672 | return -EINVAL; | |
dc99f600 DM |
1673 | case PACKET_FANOUT_HASH: |
1674 | case PACKET_FANOUT_LB: | |
95ec3eb4 | 1675 | case PACKET_FANOUT_CPU: |
5df0ddfb | 1676 | case PACKET_FANOUT_RND: |
2d36097d | 1677 | case PACKET_FANOUT_QM: |
47dceb8e | 1678 | case PACKET_FANOUT_CBPF: |
f2e52095 | 1679 | case PACKET_FANOUT_EBPF: |
dc99f600 DM |
1680 | break; |
1681 | default: | |
1682 | return -EINVAL; | |
1683 | } | |
1684 | ||
d199fab6 ED |
1685 | mutex_lock(&fanout_mutex); |
1686 | ||
d199fab6 | 1687 | err = -EALREADY; |
dc99f600 | 1688 | if (po->fanout) |
d199fab6 | 1689 | goto out; |
dc99f600 | 1690 | |
4633c9e0 WB |
1691 | if (type == PACKET_FANOUT_ROLLOVER || |
1692 | (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) { | |
d199fab6 ED |
1693 | err = -ENOMEM; |
1694 | rollover = kzalloc(sizeof(*rollover), GFP_KERNEL); | |
1695 | if (!rollover) | |
1696 | goto out; | |
1697 | atomic_long_set(&rollover->num, 0); | |
1698 | atomic_long_set(&rollover->num_huge, 0); | |
1699 | atomic_long_set(&rollover->num_failed, 0); | |
1700 | po->rollover = rollover; | |
0648ab70 WB |
1701 | } |
1702 | ||
4a69a864 MM |
1703 | if (type_flags & PACKET_FANOUT_FLAG_UNIQUEID) { |
1704 | if (id != 0) { | |
1705 | err = -EINVAL; | |
1706 | goto out; | |
1707 | } | |
1708 | if (!fanout_find_new_id(sk, &id)) { | |
1709 | err = -ENOMEM; | |
1710 | goto out; | |
1711 | } | |
1712 | /* ephemeral flag for the first socket in the group: drop it */ | |
1713 | flags &= ~(PACKET_FANOUT_FLAG_UNIQUEID >> 8); | |
1714 | } | |
1715 | ||
dc99f600 DM |
1716 | match = NULL; |
1717 | list_for_each_entry(f, &fanout_list, list) { | |
1718 | if (f->id == id && | |
1719 | read_pnet(&f->net) == sock_net(sk)) { | |
1720 | match = f; | |
1721 | break; | |
1722 | } | |
1723 | } | |
afe62c68 | 1724 | err = -EINVAL; |
77f65ebd | 1725 | if (match && match->flags != flags) |
afe62c68 | 1726 | goto out; |
dc99f600 | 1727 | if (!match) { |
afe62c68 | 1728 | err = -ENOMEM; |
dc99f600 | 1729 | match = kzalloc(sizeof(*match), GFP_KERNEL); |
afe62c68 ED |
1730 | if (!match) |
1731 | goto out; | |
1732 | write_pnet(&match->net, sock_net(sk)); | |
1733 | match->id = id; | |
1734 | match->type = type; | |
77f65ebd | 1735 | match->flags = flags; |
afe62c68 ED |
1736 | INIT_LIST_HEAD(&match->list); |
1737 | spin_lock_init(&match->lock); | |
fb5c2c17 | 1738 | refcount_set(&match->sk_ref, 0); |
47dceb8e | 1739 | fanout_init_data(match); |
afe62c68 ED |
1740 | match->prot_hook.type = po->prot_hook.type; |
1741 | match->prot_hook.dev = po->prot_hook.dev; | |
1742 | match->prot_hook.func = packet_rcv_fanout; | |
1743 | match->prot_hook.af_packet_priv = match; | |
c0de08d0 | 1744 | match->prot_hook.id_match = match_fanout_group; |
afe62c68 | 1745 | list_add(&match->list, &fanout_list); |
dc99f600 | 1746 | } |
afe62c68 | 1747 | err = -EINVAL; |
008ba2a1 WB |
1748 | |
1749 | spin_lock(&po->bind_lock); | |
1750 | if (po->running && | |
1751 | match->type == type && | |
afe62c68 ED |
1752 | match->prot_hook.type == po->prot_hook.type && |
1753 | match->prot_hook.dev == po->prot_hook.dev) { | |
1754 | err = -ENOSPC; | |
fb5c2c17 | 1755 | if (refcount_read(&match->sk_ref) < PACKET_FANOUT_MAX) { |
afe62c68 ED |
1756 | __dev_remove_pack(&po->prot_hook); |
1757 | po->fanout = match; | |
fb5c2c17 | 1758 | refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1); |
afe62c68 ED |
1759 | __fanout_link(sk, po); |
1760 | err = 0; | |
dc99f600 DM |
1761 | } |
1762 | } | |
008ba2a1 WB |
1763 | spin_unlock(&po->bind_lock); |
1764 | ||
1765 | if (err && !refcount_read(&match->sk_ref)) { | |
1766 | list_del(&match->list); | |
1767 | kfree(match); | |
1768 | } | |
1769 | ||
afe62c68 | 1770 | out: |
d199fab6 ED |
1771 | if (err && rollover) { |
1772 | kfree(rollover); | |
0648ab70 WB |
1773 | po->rollover = NULL; |
1774 | } | |
d199fab6 | 1775 | mutex_unlock(&fanout_mutex); |
dc99f600 DM |
1776 | return err; |
1777 | } | |
1778 | ||
2bd624b4 AS |
1779 | /* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes |
1780 | * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout. | |
1781 | * It is the responsibility of the caller to call fanout_release_data() and | |
1782 | * free the returned packet_fanout (after synchronize_net()) | |
1783 | */ | |
1784 | static struct packet_fanout *fanout_release(struct sock *sk) | |
dc99f600 DM |
1785 | { |
1786 | struct packet_sock *po = pkt_sk(sk); | |
1787 | struct packet_fanout *f; | |
1788 | ||
fff3321d | 1789 | mutex_lock(&fanout_mutex); |
d199fab6 ED |
1790 | f = po->fanout; |
1791 | if (f) { | |
1792 | po->fanout = NULL; | |
1793 | ||
fb5c2c17 | 1794 | if (refcount_dec_and_test(&f->sk_ref)) |
d199fab6 | 1795 | list_del(&f->list); |
2bd624b4 AS |
1796 | else |
1797 | f = NULL; | |
dc99f600 | 1798 | |
d199fab6 ED |
1799 | if (po->rollover) |
1800 | kfree_rcu(po->rollover, rcu); | |
dc99f600 DM |
1801 | } |
1802 | mutex_unlock(&fanout_mutex); | |
2bd624b4 AS |
1803 | |
1804 | return f; | |
dc99f600 | 1805 | } |
1da177e4 | 1806 | |
3c70c132 DB |
1807 | static bool packet_extra_vlan_len_allowed(const struct net_device *dev, |
1808 | struct sk_buff *skb) | |
1809 | { | |
1810 | /* Earlier code assumed this would be a VLAN pkt, double-check | |
1811 | * this now that we have the actual packet in hand. We can only | |
1812 | * do this check on Ethernet devices. | |
1813 | */ | |
1814 | if (unlikely(dev->type != ARPHRD_ETHER)) | |
1815 | return false; | |
1816 | ||
1817 | skb_reset_mac_header(skb); | |
1818 | return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q)); | |
1819 | } | |
1820 | ||
90ddc4f0 | 1821 | static const struct proto_ops packet_ops; |
1da177e4 | 1822 | |
90ddc4f0 | 1823 | static const struct proto_ops packet_ops_spkt; |
1da177e4 | 1824 | |
40d4e3df ED |
1825 | static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
1826 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
1827 | { |
1828 | struct sock *sk; | |
1829 | struct sockaddr_pkt *spkt; | |
1830 | ||
1831 | /* | |
1832 | * When we registered the protocol we saved the socket in the data | |
1833 | * field for just this event. | |
1834 | */ | |
1835 | ||
1836 | sk = pt->af_packet_priv; | |
1ce4f28b | 1837 | |
1da177e4 LT |
1838 | /* |
1839 | * Yank back the headers [hope the device set this | |
1840 | * right or kerboom...] | |
1841 | * | |
1842 | * Incoming packets have ll header pulled, | |
1843 | * push it back. | |
1844 | * | |
98e399f8 | 1845 | * For outgoing ones skb->data == skb_mac_header(skb) |
1da177e4 LT |
1846 | * so that this procedure is noop. |
1847 | */ | |
1848 | ||
1849 | if (skb->pkt_type == PACKET_LOOPBACK) | |
1850 | goto out; | |
1851 | ||
09ad9bc7 | 1852 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
1853 | goto out; |
1854 | ||
40d4e3df ED |
1855 | skb = skb_share_check(skb, GFP_ATOMIC); |
1856 | if (skb == NULL) | |
1da177e4 LT |
1857 | goto oom; |
1858 | ||
1859 | /* drop any routing info */ | |
adf30907 | 1860 | skb_dst_drop(skb); |
1da177e4 | 1861 | |
84531c24 PO |
1862 | /* drop conntrack reference */ |
1863 | nf_reset(skb); | |
1864 | ||
ffbc6111 | 1865 | spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
1da177e4 | 1866 | |
98e399f8 | 1867 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
1868 | |
1869 | /* | |
1870 | * The SOCK_PACKET socket receives _all_ frames. | |
1871 | */ | |
1872 | ||
1873 | spkt->spkt_family = dev->type; | |
1874 | strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); | |
1875 | spkt->spkt_protocol = skb->protocol; | |
1876 | ||
1877 | /* | |
1878 | * Charge the memory to the socket. This is done specifically | |
1879 | * to prevent sockets using all the memory up. | |
1880 | */ | |
1881 | ||
40d4e3df | 1882 | if (sock_queue_rcv_skb(sk, skb) == 0) |
1da177e4 LT |
1883 | return 0; |
1884 | ||
1885 | out: | |
1886 | kfree_skb(skb); | |
1887 | oom: | |
1888 | return 0; | |
1889 | } | |
1890 | ||
1891 | ||
1892 | /* | |
1893 | * Output a raw packet to a device layer. This bypasses all the other | |
1894 | * protocol layers and you must therefore supply it with a complete frame | |
1895 | */ | |
1ce4f28b | 1896 | |
1b784140 YX |
1897 | static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg, |
1898 | size_t len) | |
1da177e4 LT |
1899 | { |
1900 | struct sock *sk = sock->sk; | |
342dfc30 | 1901 | DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name); |
1a35ca80 | 1902 | struct sk_buff *skb = NULL; |
1da177e4 | 1903 | struct net_device *dev; |
c14ac945 | 1904 | struct sockcm_cookie sockc; |
40d4e3df | 1905 | __be16 proto = 0; |
1da177e4 | 1906 | int err; |
3bdc0eba | 1907 | int extra_len = 0; |
1ce4f28b | 1908 | |
1da177e4 | 1909 | /* |
1ce4f28b | 1910 | * Get and verify the address. |
1da177e4 LT |
1911 | */ |
1912 | ||
40d4e3df | 1913 | if (saddr) { |
1da177e4 | 1914 | if (msg->msg_namelen < sizeof(struct sockaddr)) |
40d4e3df ED |
1915 | return -EINVAL; |
1916 | if (msg->msg_namelen == sizeof(struct sockaddr_pkt)) | |
1917 | proto = saddr->spkt_protocol; | |
1918 | } else | |
1919 | return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */ | |
1da177e4 LT |
1920 | |
1921 | /* | |
1ce4f28b | 1922 | * Find the device first to size check it |
1da177e4 LT |
1923 | */ |
1924 | ||
de74e92a | 1925 | saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0; |
1a35ca80 | 1926 | retry: |
654d1f8a ED |
1927 | rcu_read_lock(); |
1928 | dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); | |
1da177e4 LT |
1929 | err = -ENODEV; |
1930 | if (dev == NULL) | |
1931 | goto out_unlock; | |
1ce4f28b | 1932 | |
d5e76b0a DM |
1933 | err = -ENETDOWN; |
1934 | if (!(dev->flags & IFF_UP)) | |
1935 | goto out_unlock; | |
1936 | ||
1da177e4 | 1937 | /* |
40d4e3df ED |
1938 | * You may not queue a frame bigger than the mtu. This is the lowest level |
1939 | * raw protocol and you must do your own fragmentation at this level. | |
1da177e4 | 1940 | */ |
1ce4f28b | 1941 | |
3bdc0eba BG |
1942 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
1943 | if (!netif_supports_nofcs(dev)) { | |
1944 | err = -EPROTONOSUPPORT; | |
1945 | goto out_unlock; | |
1946 | } | |
1947 | extra_len = 4; /* We're doing our own CRC */ | |
1948 | } | |
1949 | ||
1da177e4 | 1950 | err = -EMSGSIZE; |
3bdc0eba | 1951 | if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len) |
1da177e4 LT |
1952 | goto out_unlock; |
1953 | ||
1a35ca80 ED |
1954 | if (!skb) { |
1955 | size_t reserved = LL_RESERVED_SPACE(dev); | |
4ce40912 | 1956 | int tlen = dev->needed_tailroom; |
1a35ca80 ED |
1957 | unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; |
1958 | ||
1959 | rcu_read_unlock(); | |
4ce40912 | 1960 | skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL); |
1a35ca80 ED |
1961 | if (skb == NULL) |
1962 | return -ENOBUFS; | |
1963 | /* FIXME: Save some space for broken drivers that write a hard | |
1964 | * header at transmission time by themselves. PPP is the notable | |
1965 | * one here. This should really be fixed at the driver level. | |
1966 | */ | |
1967 | skb_reserve(skb, reserved); | |
1968 | skb_reset_network_header(skb); | |
1969 | ||
1970 | /* Try to align data part correctly */ | |
1971 | if (hhlen) { | |
1972 | skb->data -= hhlen; | |
1973 | skb->tail -= hhlen; | |
1974 | if (len < hhlen) | |
1975 | skb_reset_network_header(skb); | |
1976 | } | |
6ce8e9ce | 1977 | err = memcpy_from_msg(skb_put(skb, len), msg, len); |
1a35ca80 ED |
1978 | if (err) |
1979 | goto out_free; | |
1980 | goto retry; | |
1da177e4 LT |
1981 | } |
1982 | ||
9ed988cd WB |
1983 | if (!dev_validate_header(dev, skb->data, len)) { |
1984 | err = -EINVAL; | |
1985 | goto out_unlock; | |
1986 | } | |
3c70c132 DB |
1987 | if (len > (dev->mtu + dev->hard_header_len + extra_len) && |
1988 | !packet_extra_vlan_len_allowed(dev, skb)) { | |
1989 | err = -EMSGSIZE; | |
1990 | goto out_unlock; | |
57f89bfa | 1991 | } |
1a35ca80 | 1992 | |
edbe7746 | 1993 | sockc.tsflags = sk->sk_tsflags; |
c14ac945 SHY |
1994 | if (msg->msg_controllen) { |
1995 | err = sock_cmsg_send(sk, msg, &sockc); | |
f8e7718c | 1996 | if (unlikely(err)) |
c14ac945 | 1997 | goto out_unlock; |
c14ac945 SHY |
1998 | } |
1999 | ||
1da177e4 LT |
2000 | skb->protocol = proto; |
2001 | skb->dev = dev; | |
2002 | skb->priority = sk->sk_priority; | |
2d37a186 | 2003 | skb->mark = sk->sk_mark; |
bf84a010 | 2004 | |
c14ac945 | 2005 | sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags); |
1da177e4 | 2006 | |
3bdc0eba BG |
2007 | if (unlikely(extra_len == 4)) |
2008 | skb->no_fcs = 1; | |
2009 | ||
40893fd0 | 2010 | skb_probe_transport_header(skb, 0); |
c1aad275 | 2011 | |
1da177e4 | 2012 | dev_queue_xmit(skb); |
654d1f8a | 2013 | rcu_read_unlock(); |
40d4e3df | 2014 | return len; |
1da177e4 | 2015 | |
1da177e4 | 2016 | out_unlock: |
654d1f8a | 2017 | rcu_read_unlock(); |
1a35ca80 ED |
2018 | out_free: |
2019 | kfree_skb(skb); | |
1da177e4 LT |
2020 | return err; |
2021 | } | |
1da177e4 | 2022 | |
ff936a04 AS |
2023 | static unsigned int run_filter(struct sk_buff *skb, |
2024 | const struct sock *sk, | |
2025 | unsigned int res) | |
1da177e4 LT |
2026 | { |
2027 | struct sk_filter *filter; | |
fda9ef5d | 2028 | |
80f8f102 ED |
2029 | rcu_read_lock(); |
2030 | filter = rcu_dereference(sk->sk_filter); | |
dbcb5855 | 2031 | if (filter != NULL) |
ff936a04 | 2032 | res = bpf_prog_run_clear_cb(filter->prog, skb); |
80f8f102 | 2033 | rcu_read_unlock(); |
1da177e4 | 2034 | |
dbcb5855 | 2035 | return res; |
1da177e4 LT |
2036 | } |
2037 | ||
16cc1400 WB |
2038 | static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb, |
2039 | size_t *len) | |
2040 | { | |
2041 | struct virtio_net_hdr vnet_hdr; | |
2042 | ||
2043 | if (*len < sizeof(vnet_hdr)) | |
2044 | return -EINVAL; | |
2045 | *len -= sizeof(vnet_hdr); | |
2046 | ||
6391a448 | 2047 | if (virtio_net_hdr_from_skb(skb, &vnet_hdr, vio_le(), true)) |
16cc1400 WB |
2048 | return -EINVAL; |
2049 | ||
2050 | return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr)); | |
2051 | } | |
2052 | ||
1da177e4 | 2053 | /* |
62ab0812 ED |
2054 | * This function makes lazy skb cloning in hope that most of packets |
2055 | * are discarded by BPF. | |
2056 | * | |
2057 | * Note tricky part: we DO mangle shared skb! skb->data, skb->len | |
2058 | * and skb->cb are mangled. It works because (and until) packets | |
2059 | * falling here are owned by current CPU. Output packets are cloned | |
2060 | * by dev_queue_xmit_nit(), input packets are processed by net_bh | |
2061 | * sequencially, so that if we return skb to original state on exit, | |
2062 | * we will not harm anyone. | |
1da177e4 LT |
2063 | */ |
2064 | ||
40d4e3df ED |
2065 | static int packet_rcv(struct sk_buff *skb, struct net_device *dev, |
2066 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
2067 | { |
2068 | struct sock *sk; | |
2069 | struct sockaddr_ll *sll; | |
2070 | struct packet_sock *po; | |
40d4e3df | 2071 | u8 *skb_head = skb->data; |
1da177e4 | 2072 | int skb_len = skb->len; |
dbcb5855 | 2073 | unsigned int snaplen, res; |
da37845f | 2074 | bool is_drop_n_account = false; |
1da177e4 LT |
2075 | |
2076 | if (skb->pkt_type == PACKET_LOOPBACK) | |
2077 | goto drop; | |
2078 | ||
2079 | sk = pt->af_packet_priv; | |
2080 | po = pkt_sk(sk); | |
2081 | ||
09ad9bc7 | 2082 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
2083 | goto drop; |
2084 | ||
1da177e4 LT |
2085 | skb->dev = dev; |
2086 | ||
3b04ddde | 2087 | if (dev->header_ops) { |
1da177e4 | 2088 | /* The device has an explicit notion of ll header, |
62ab0812 ED |
2089 | * exported to higher levels. |
2090 | * | |
2091 | * Otherwise, the device hides details of its frame | |
2092 | * structure, so that corresponding packet head is | |
2093 | * never delivered to user. | |
1da177e4 LT |
2094 | */ |
2095 | if (sk->sk_type != SOCK_DGRAM) | |
98e399f8 | 2096 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
2097 | else if (skb->pkt_type == PACKET_OUTGOING) { |
2098 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 2099 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
2100 | } |
2101 | } | |
2102 | ||
2103 | snaplen = skb->len; | |
2104 | ||
dbcb5855 DM |
2105 | res = run_filter(skb, sk, snaplen); |
2106 | if (!res) | |
fda9ef5d | 2107 | goto drop_n_restore; |
dbcb5855 DM |
2108 | if (snaplen > res) |
2109 | snaplen = res; | |
1da177e4 | 2110 | |
0fd7bac6 | 2111 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
1da177e4 LT |
2112 | goto drop_n_acct; |
2113 | ||
2114 | if (skb_shared(skb)) { | |
2115 | struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); | |
2116 | if (nskb == NULL) | |
2117 | goto drop_n_acct; | |
2118 | ||
2119 | if (skb_head != skb->data) { | |
2120 | skb->data = skb_head; | |
2121 | skb->len = skb_len; | |
2122 | } | |
abc4e4fa | 2123 | consume_skb(skb); |
1da177e4 LT |
2124 | skb = nskb; |
2125 | } | |
2126 | ||
b4772ef8 | 2127 | sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8); |
ffbc6111 HX |
2128 | |
2129 | sll = &PACKET_SKB_CB(skb)->sa.ll; | |
1da177e4 | 2130 | sll->sll_hatype = dev->type; |
1da177e4 | 2131 | sll->sll_pkttype = skb->pkt_type; |
8032b464 | 2132 | if (unlikely(po->origdev)) |
80feaacb PWJ |
2133 | sll->sll_ifindex = orig_dev->ifindex; |
2134 | else | |
2135 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 2136 | |
b95cce35 | 2137 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 | 2138 | |
2472d761 EB |
2139 | /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg(). |
2140 | * Use their space for storing the original skb length. | |
2141 | */ | |
2142 | PACKET_SKB_CB(skb)->sa.origlen = skb->len; | |
8dc41944 | 2143 | |
1da177e4 LT |
2144 | if (pskb_trim(skb, snaplen)) |
2145 | goto drop_n_acct; | |
2146 | ||
2147 | skb_set_owner_r(skb, sk); | |
2148 | skb->dev = NULL; | |
adf30907 | 2149 | skb_dst_drop(skb); |
1da177e4 | 2150 | |
84531c24 PO |
2151 | /* drop conntrack reference */ |
2152 | nf_reset(skb); | |
2153 | ||
1da177e4 | 2154 | spin_lock(&sk->sk_receive_queue.lock); |
ee80fbf3 | 2155 | po->stats.stats1.tp_packets++; |
3bc3b96f | 2156 | sock_skb_set_dropcount(sk, skb); |
1da177e4 LT |
2157 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
2158 | spin_unlock(&sk->sk_receive_queue.lock); | |
676d2369 | 2159 | sk->sk_data_ready(sk); |
1da177e4 LT |
2160 | return 0; |
2161 | ||
2162 | drop_n_acct: | |
da37845f | 2163 | is_drop_n_account = true; |
7091fbd8 | 2164 | spin_lock(&sk->sk_receive_queue.lock); |
ee80fbf3 | 2165 | po->stats.stats1.tp_drops++; |
7091fbd8 WB |
2166 | atomic_inc(&sk->sk_drops); |
2167 | spin_unlock(&sk->sk_receive_queue.lock); | |
1da177e4 LT |
2168 | |
2169 | drop_n_restore: | |
2170 | if (skb_head != skb->data && skb_shared(skb)) { | |
2171 | skb->data = skb_head; | |
2172 | skb->len = skb_len; | |
2173 | } | |
2174 | drop: | |
da37845f WJ |
2175 | if (!is_drop_n_account) |
2176 | consume_skb(skb); | |
2177 | else | |
2178 | kfree_skb(skb); | |
1da177e4 LT |
2179 | return 0; |
2180 | } | |
2181 | ||
40d4e3df ED |
2182 | static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
2183 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
2184 | { |
2185 | struct sock *sk; | |
2186 | struct packet_sock *po; | |
2187 | struct sockaddr_ll *sll; | |
184f489e | 2188 | union tpacket_uhdr h; |
40d4e3df | 2189 | u8 *skb_head = skb->data; |
1da177e4 | 2190 | int skb_len = skb->len; |
dbcb5855 | 2191 | unsigned int snaplen, res; |
f6fb8f10 | 2192 | unsigned long status = TP_STATUS_USER; |
bbd6ef87 | 2193 | unsigned short macoff, netoff, hdrlen; |
1da177e4 | 2194 | struct sk_buff *copy_skb = NULL; |
bbd6ef87 | 2195 | struct timespec ts; |
b9c32fb2 | 2196 | __u32 ts_status; |
da37845f | 2197 | bool is_drop_n_account = false; |
edbd58be | 2198 | bool do_vnet = false; |
1da177e4 | 2199 | |
51846355 AW |
2200 | /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT. |
2201 | * We may add members to them until current aligned size without forcing | |
2202 | * userspace to call getsockopt(..., PACKET_HDRLEN, ...). | |
2203 | */ | |
2204 | BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32); | |
2205 | BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48); | |
2206 | ||
1da177e4 LT |
2207 | if (skb->pkt_type == PACKET_LOOPBACK) |
2208 | goto drop; | |
2209 | ||
2210 | sk = pt->af_packet_priv; | |
2211 | po = pkt_sk(sk); | |
2212 | ||
09ad9bc7 | 2213 | if (!net_eq(dev_net(dev), sock_net(sk))) |
d12d01d6 DL |
2214 | goto drop; |
2215 | ||
3b04ddde | 2216 | if (dev->header_ops) { |
1da177e4 | 2217 | if (sk->sk_type != SOCK_DGRAM) |
98e399f8 | 2218 | skb_push(skb, skb->data - skb_mac_header(skb)); |
1da177e4 LT |
2219 | else if (skb->pkt_type == PACKET_OUTGOING) { |
2220 | /* Special case: outgoing packets have ll header at head */ | |
bbe735e4 | 2221 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
2222 | } |
2223 | } | |
2224 | ||
2225 | snaplen = skb->len; | |
2226 | ||
dbcb5855 DM |
2227 | res = run_filter(skb, sk, snaplen); |
2228 | if (!res) | |
fda9ef5d | 2229 | goto drop_n_restore; |
68c2e5de AD |
2230 | |
2231 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
2232 | status |= TP_STATUS_CSUMNOTREADY; | |
682f048b AD |
2233 | else if (skb->pkt_type != PACKET_OUTGOING && |
2234 | (skb->ip_summed == CHECKSUM_COMPLETE || | |
2235 | skb_csum_unnecessary(skb))) | |
2236 | status |= TP_STATUS_CSUM_VALID; | |
68c2e5de | 2237 | |
dbcb5855 DM |
2238 | if (snaplen > res) |
2239 | snaplen = res; | |
1da177e4 LT |
2240 | |
2241 | if (sk->sk_type == SOCK_DGRAM) { | |
8913336a PM |
2242 | macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
2243 | po->tp_reserve; | |
1da177e4 | 2244 | } else { |
95c96174 | 2245 | unsigned int maclen = skb_network_offset(skb); |
bbd6ef87 | 2246 | netoff = TPACKET_ALIGN(po->tp_hdrlen + |
8913336a | 2247 | (maclen < 16 ? 16 : maclen)) + |
58d19b19 | 2248 | po->tp_reserve; |
edbd58be | 2249 | if (po->has_vnet_hdr) { |
58d19b19 | 2250 | netoff += sizeof(struct virtio_net_hdr); |
edbd58be BP |
2251 | do_vnet = true; |
2252 | } | |
1da177e4 LT |
2253 | macoff = netoff - maclen; |
2254 | } | |
f6fb8f10 | 2255 | if (po->tp_version <= TPACKET_V2) { |
2256 | if (macoff + snaplen > po->rx_ring.frame_size) { | |
2257 | if (po->copy_thresh && | |
0fd7bac6 | 2258 | atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
f6fb8f10 | 2259 | if (skb_shared(skb)) { |
2260 | copy_skb = skb_clone(skb, GFP_ATOMIC); | |
2261 | } else { | |
2262 | copy_skb = skb_get(skb); | |
2263 | skb_head = skb->data; | |
2264 | } | |
2265 | if (copy_skb) | |
2266 | skb_set_owner_r(copy_skb, sk); | |
1da177e4 | 2267 | } |
f6fb8f10 | 2268 | snaplen = po->rx_ring.frame_size - macoff; |
edbd58be | 2269 | if ((int)snaplen < 0) { |
f6fb8f10 | 2270 | snaplen = 0; |
edbd58be BP |
2271 | do_vnet = false; |
2272 | } | |
1da177e4 | 2273 | } |
dc808110 ED |
2274 | } else if (unlikely(macoff + snaplen > |
2275 | GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) { | |
2276 | u32 nval; | |
2277 | ||
2278 | nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff; | |
2279 | pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n", | |
2280 | snaplen, nval, macoff); | |
2281 | snaplen = nval; | |
2282 | if (unlikely((int)snaplen < 0)) { | |
2283 | snaplen = 0; | |
2284 | macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len; | |
edbd58be | 2285 | do_vnet = false; |
dc808110 | 2286 | } |
1da177e4 | 2287 | } |
1da177e4 | 2288 | spin_lock(&sk->sk_receive_queue.lock); |
f6fb8f10 | 2289 | h.raw = packet_current_rx_frame(po, skb, |
2290 | TP_STATUS_KERNEL, (macoff+snaplen)); | |
bbd6ef87 | 2291 | if (!h.raw) |
58d19b19 | 2292 | goto drop_n_account; |
f6fb8f10 | 2293 | if (po->tp_version <= TPACKET_V2) { |
2294 | packet_increment_rx_head(po, &po->rx_ring); | |
2295 | /* | |
2296 | * LOSING will be reported till you read the stats, | |
2297 | * because it's COR - Clear On Read. | |
2298 | * Anyways, moving it for V1/V2 only as V3 doesn't need this | |
2299 | * at packet level. | |
2300 | */ | |
ee80fbf3 | 2301 | if (po->stats.stats1.tp_drops) |
f6fb8f10 | 2302 | status |= TP_STATUS_LOSING; |
2303 | } | |
ee80fbf3 | 2304 | po->stats.stats1.tp_packets++; |
1da177e4 LT |
2305 | if (copy_skb) { |
2306 | status |= TP_STATUS_COPY; | |
2307 | __skb_queue_tail(&sk->sk_receive_queue, copy_skb); | |
2308 | } | |
1da177e4 LT |
2309 | spin_unlock(&sk->sk_receive_queue.lock); |
2310 | ||
edbd58be | 2311 | if (do_vnet) { |
5a213881 JR |
2312 | if (virtio_net_hdr_from_skb(skb, h.raw + macoff - |
2313 | sizeof(struct virtio_net_hdr), | |
6391a448 | 2314 | vio_le(), true)) { |
58d19b19 WB |
2315 | spin_lock(&sk->sk_receive_queue.lock); |
2316 | goto drop_n_account; | |
2317 | } | |
2318 | } | |
2319 | ||
bbd6ef87 | 2320 | skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
b9c32fb2 DB |
2321 | |
2322 | if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) | |
7a51384c | 2323 | getnstimeofday(&ts); |
1da177e4 | 2324 | |
b9c32fb2 DB |
2325 | status |= ts_status; |
2326 | ||
bbd6ef87 PM |
2327 | switch (po->tp_version) { |
2328 | case TPACKET_V1: | |
2329 | h.h1->tp_len = skb->len; | |
2330 | h.h1->tp_snaplen = snaplen; | |
2331 | h.h1->tp_mac = macoff; | |
2332 | h.h1->tp_net = netoff; | |
4b457bdf DB |
2333 | h.h1->tp_sec = ts.tv_sec; |
2334 | h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; | |
bbd6ef87 PM |
2335 | hdrlen = sizeof(*h.h1); |
2336 | break; | |
2337 | case TPACKET_V2: | |
2338 | h.h2->tp_len = skb->len; | |
2339 | h.h2->tp_snaplen = snaplen; | |
2340 | h.h2->tp_mac = macoff; | |
2341 | h.h2->tp_net = netoff; | |
bbd6ef87 PM |
2342 | h.h2->tp_sec = ts.tv_sec; |
2343 | h.h2->tp_nsec = ts.tv_nsec; | |
df8a39de JP |
2344 | if (skb_vlan_tag_present(skb)) { |
2345 | h.h2->tp_vlan_tci = skb_vlan_tag_get(skb); | |
a0cdfcf3 AW |
2346 | h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto); |
2347 | status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; | |
a3bcc23e BG |
2348 | } else { |
2349 | h.h2->tp_vlan_tci = 0; | |
a0cdfcf3 | 2350 | h.h2->tp_vlan_tpid = 0; |
a3bcc23e | 2351 | } |
e4d26f4b | 2352 | memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding)); |
bbd6ef87 PM |
2353 | hdrlen = sizeof(*h.h2); |
2354 | break; | |
f6fb8f10 | 2355 | case TPACKET_V3: |
2356 | /* tp_nxt_offset,vlan are already populated above. | |
2357 | * So DONT clear those fields here | |
2358 | */ | |
2359 | h.h3->tp_status |= status; | |
2360 | h.h3->tp_len = skb->len; | |
2361 | h.h3->tp_snaplen = snaplen; | |
2362 | h.h3->tp_mac = macoff; | |
2363 | h.h3->tp_net = netoff; | |
f6fb8f10 | 2364 | h.h3->tp_sec = ts.tv_sec; |
2365 | h.h3->tp_nsec = ts.tv_nsec; | |
e4d26f4b | 2366 | memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding)); |
f6fb8f10 | 2367 | hdrlen = sizeof(*h.h3); |
2368 | break; | |
bbd6ef87 PM |
2369 | default: |
2370 | BUG(); | |
2371 | } | |
1da177e4 | 2372 | |
bbd6ef87 | 2373 | sll = h.raw + TPACKET_ALIGN(hdrlen); |
b95cce35 | 2374 | sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
1da177e4 LT |
2375 | sll->sll_family = AF_PACKET; |
2376 | sll->sll_hatype = dev->type; | |
2377 | sll->sll_protocol = skb->protocol; | |
2378 | sll->sll_pkttype = skb->pkt_type; | |
8032b464 | 2379 | if (unlikely(po->origdev)) |
80feaacb PWJ |
2380 | sll->sll_ifindex = orig_dev->ifindex; |
2381 | else | |
2382 | sll->sll_ifindex = dev->ifindex; | |
1da177e4 | 2383 | |
e16aa207 | 2384 | smp_mb(); |
f0d4eb29 | 2385 | |
f6dafa95 | 2386 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
f0d4eb29 | 2387 | if (po->tp_version <= TPACKET_V2) { |
0af55bb5 CG |
2388 | u8 *start, *end; |
2389 | ||
f0d4eb29 DB |
2390 | end = (u8 *) PAGE_ALIGN((unsigned long) h.raw + |
2391 | macoff + snaplen); | |
2392 | ||
2393 | for (start = h.raw; start < end; start += PAGE_SIZE) | |
2394 | flush_dcache_page(pgv_to_page(start)); | |
1da177e4 | 2395 | } |
f0d4eb29 | 2396 | smp_wmb(); |
f6dafa95 | 2397 | #endif |
f0d4eb29 | 2398 | |
da413eec | 2399 | if (po->tp_version <= TPACKET_V2) { |
f6fb8f10 | 2400 | __packet_set_status(po, h.raw, status); |
da413eec DC |
2401 | sk->sk_data_ready(sk); |
2402 | } else { | |
f6fb8f10 | 2403 | prb_clear_blk_fill_status(&po->rx_ring); |
da413eec | 2404 | } |
1da177e4 LT |
2405 | |
2406 | drop_n_restore: | |
2407 | if (skb_head != skb->data && skb_shared(skb)) { | |
2408 | skb->data = skb_head; | |
2409 | skb->len = skb_len; | |
2410 | } | |
2411 | drop: | |
da37845f WJ |
2412 | if (!is_drop_n_account) |
2413 | consume_skb(skb); | |
2414 | else | |
2415 | kfree_skb(skb); | |
1da177e4 LT |
2416 | return 0; |
2417 | ||
58d19b19 | 2418 | drop_n_account: |
da37845f | 2419 | is_drop_n_account = true; |
ee80fbf3 | 2420 | po->stats.stats1.tp_drops++; |
1da177e4 LT |
2421 | spin_unlock(&sk->sk_receive_queue.lock); |
2422 | ||
676d2369 | 2423 | sk->sk_data_ready(sk); |
acb5d75b | 2424 | kfree_skb(copy_skb); |
1da177e4 LT |
2425 | goto drop_n_restore; |
2426 | } | |
2427 | ||
69e3c75f JB |
2428 | static void tpacket_destruct_skb(struct sk_buff *skb) |
2429 | { | |
2430 | struct packet_sock *po = pkt_sk(skb->sk); | |
1da177e4 | 2431 | |
69e3c75f | 2432 | if (likely(po->tx_ring.pg_vec)) { |
f0d4eb29 | 2433 | void *ph; |
b9c32fb2 DB |
2434 | __u32 ts; |
2435 | ||
69e3c75f | 2436 | ph = skb_shinfo(skb)->destructor_arg; |
b0138408 | 2437 | packet_dec_pending(&po->tx_ring); |
b9c32fb2 DB |
2438 | |
2439 | ts = __packet_set_timestamp(po, ph, skb); | |
2440 | __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts); | |
69e3c75f JB |
2441 | } |
2442 | ||
2443 | sock_wfree(skb); | |
2444 | } | |
2445 | ||
c72219b7 DB |
2446 | static void tpacket_set_protocol(const struct net_device *dev, |
2447 | struct sk_buff *skb) | |
2448 | { | |
2449 | if (dev->type == ARPHRD_ETHER) { | |
2450 | skb_reset_mac_header(skb); | |
2451 | skb->protocol = eth_hdr(skb)->h_proto; | |
2452 | } | |
2453 | } | |
2454 | ||
16cc1400 WB |
2455 | static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len) |
2456 | { | |
16cc1400 WB |
2457 | if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
2458 | (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) + | |
2459 | __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 > | |
2460 | __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len))) | |
2461 | vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(), | |
2462 | __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) + | |
2463 | __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2); | |
2464 | ||
2465 | if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len) | |
2466 | return -EINVAL; | |
2467 | ||
16cc1400 WB |
2468 | return 0; |
2469 | } | |
2470 | ||
2471 | static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len, | |
2472 | struct virtio_net_hdr *vnet_hdr) | |
2473 | { | |
16cc1400 WB |
2474 | if (*len < sizeof(*vnet_hdr)) |
2475 | return -EINVAL; | |
2476 | *len -= sizeof(*vnet_hdr); | |
2477 | ||
cbbd26b8 | 2478 | if (!copy_from_iter_full(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter)) |
16cc1400 WB |
2479 | return -EFAULT; |
2480 | ||
2481 | return __packet_snd_vnet_parse(vnet_hdr, *len); | |
2482 | } | |
2483 | ||
40d4e3df | 2484 | static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
8d39b4a6 | 2485 | void *frame, struct net_device *dev, void *data, int tp_len, |
c14ac945 SHY |
2486 | __be16 proto, unsigned char *addr, int hlen, int copylen, |
2487 | const struct sockcm_cookie *sockc) | |
69e3c75f | 2488 | { |
184f489e | 2489 | union tpacket_uhdr ph; |
8d39b4a6 | 2490 | int to_write, offset, len, nr_frags, len_max; |
69e3c75f JB |
2491 | struct socket *sock = po->sk.sk_socket; |
2492 | struct page *page; | |
69e3c75f JB |
2493 | int err; |
2494 | ||
2495 | ph.raw = frame; | |
2496 | ||
2497 | skb->protocol = proto; | |
2498 | skb->dev = dev; | |
2499 | skb->priority = po->sk.sk_priority; | |
2d37a186 | 2500 | skb->mark = po->sk.sk_mark; |
c14ac945 | 2501 | sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags); |
69e3c75f JB |
2502 | skb_shinfo(skb)->destructor_arg = ph.raw; |
2503 | ||
ae641949 | 2504 | skb_reserve(skb, hlen); |
69e3c75f | 2505 | skb_reset_network_header(skb); |
c1aad275 | 2506 | |
69e3c75f JB |
2507 | to_write = tp_len; |
2508 | ||
2509 | if (sock->type == SOCK_DGRAM) { | |
2510 | err = dev_hard_header(skb, dev, ntohs(proto), addr, | |
2511 | NULL, tp_len); | |
2512 | if (unlikely(err < 0)) | |
2513 | return -EINVAL; | |
1d036d25 | 2514 | } else if (copylen) { |
9ed988cd WB |
2515 | int hdrlen = min_t(int, copylen, tp_len); |
2516 | ||
69e3c75f | 2517 | skb_push(skb, dev->hard_header_len); |
1d036d25 | 2518 | skb_put(skb, copylen - dev->hard_header_len); |
9ed988cd | 2519 | err = skb_store_bits(skb, 0, data, hdrlen); |
69e3c75f JB |
2520 | if (unlikely(err)) |
2521 | return err; | |
9ed988cd WB |
2522 | if (!dev_validate_header(dev, skb->data, hdrlen)) |
2523 | return -EINVAL; | |
c72219b7 DB |
2524 | if (!skb->protocol) |
2525 | tpacket_set_protocol(dev, skb); | |
69e3c75f | 2526 | |
9ed988cd WB |
2527 | data += hdrlen; |
2528 | to_write -= hdrlen; | |
69e3c75f JB |
2529 | } |
2530 | ||
69e3c75f JB |
2531 | offset = offset_in_page(data); |
2532 | len_max = PAGE_SIZE - offset; | |
2533 | len = ((to_write > len_max) ? len_max : to_write); | |
2534 | ||
2535 | skb->data_len = to_write; | |
2536 | skb->len += to_write; | |
2537 | skb->truesize += to_write; | |
14afee4b | 2538 | refcount_add(to_write, &po->sk.sk_wmem_alloc); |
69e3c75f JB |
2539 | |
2540 | while (likely(to_write)) { | |
2541 | nr_frags = skb_shinfo(skb)->nr_frags; | |
2542 | ||
2543 | if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { | |
40d4e3df ED |
2544 | pr_err("Packet exceed the number of skb frags(%lu)\n", |
2545 | MAX_SKB_FRAGS); | |
69e3c75f JB |
2546 | return -EFAULT; |
2547 | } | |
2548 | ||
0af55bb5 CG |
2549 | page = pgv_to_page(data); |
2550 | data += len; | |
69e3c75f JB |
2551 | flush_dcache_page(page); |
2552 | get_page(page); | |
0af55bb5 | 2553 | skb_fill_page_desc(skb, nr_frags, page, offset, len); |
69e3c75f JB |
2554 | to_write -= len; |
2555 | offset = 0; | |
2556 | len_max = PAGE_SIZE; | |
2557 | len = ((to_write > len_max) ? len_max : to_write); | |
2558 | } | |
2559 | ||
8fd6c80d | 2560 | skb_probe_transport_header(skb, 0); |
efdfa2f7 | 2561 | |
69e3c75f JB |
2562 | return tp_len; |
2563 | } | |
2564 | ||
8d39b4a6 WB |
2565 | static int tpacket_parse_header(struct packet_sock *po, void *frame, |
2566 | int size_max, void **data) | |
2567 | { | |
2568 | union tpacket_uhdr ph; | |
2569 | int tp_len, off; | |
2570 | ||
2571 | ph.raw = frame; | |
2572 | ||
2573 | switch (po->tp_version) { | |
7f953ab2 SV |
2574 | case TPACKET_V3: |
2575 | if (ph.h3->tp_next_offset != 0) { | |
2576 | pr_warn_once("variable sized slot not supported"); | |
2577 | return -EINVAL; | |
2578 | } | |
2579 | tp_len = ph.h3->tp_len; | |
2580 | break; | |
8d39b4a6 WB |
2581 | case TPACKET_V2: |
2582 | tp_len = ph.h2->tp_len; | |
2583 | break; | |
2584 | default: | |
2585 | tp_len = ph.h1->tp_len; | |
2586 | break; | |
2587 | } | |
2588 | if (unlikely(tp_len > size_max)) { | |
2589 | pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); | |
2590 | return -EMSGSIZE; | |
2591 | } | |
2592 | ||
2593 | if (unlikely(po->tp_tx_has_off)) { | |
2594 | int off_min, off_max; | |
2595 | ||
2596 | off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
2597 | off_max = po->tx_ring.frame_size - tp_len; | |
2598 | if (po->sk.sk_type == SOCK_DGRAM) { | |
2599 | switch (po->tp_version) { | |
7f953ab2 SV |
2600 | case TPACKET_V3: |
2601 | off = ph.h3->tp_net; | |
2602 | break; | |
8d39b4a6 WB |
2603 | case TPACKET_V2: |
2604 | off = ph.h2->tp_net; | |
2605 | break; | |
2606 | default: | |
2607 | off = ph.h1->tp_net; | |
2608 | break; | |
2609 | } | |
2610 | } else { | |
2611 | switch (po->tp_version) { | |
7f953ab2 SV |
2612 | case TPACKET_V3: |
2613 | off = ph.h3->tp_mac; | |
2614 | break; | |
8d39b4a6 WB |
2615 | case TPACKET_V2: |
2616 | off = ph.h2->tp_mac; | |
2617 | break; | |
2618 | default: | |
2619 | off = ph.h1->tp_mac; | |
2620 | break; | |
2621 | } | |
2622 | } | |
2623 | if (unlikely((off < off_min) || (off_max < off))) | |
2624 | return -EINVAL; | |
2625 | } else { | |
2626 | off = po->tp_hdrlen - sizeof(struct sockaddr_ll); | |
2627 | } | |
2628 | ||
2629 | *data = frame + off; | |
2630 | return tp_len; | |
2631 | } | |
2632 | ||
69e3c75f JB |
2633 | static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) |
2634 | { | |
69e3c75f JB |
2635 | struct sk_buff *skb; |
2636 | struct net_device *dev; | |
1d036d25 | 2637 | struct virtio_net_hdr *vnet_hdr = NULL; |
c14ac945 | 2638 | struct sockcm_cookie sockc; |
69e3c75f | 2639 | __be16 proto; |
09effa67 | 2640 | int err, reserve = 0; |
40d4e3df | 2641 | void *ph; |
342dfc30 | 2642 | DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name); |
87a2fd28 | 2643 | bool need_wait = !(msg->msg_flags & MSG_DONTWAIT); |
69e3c75f JB |
2644 | int tp_len, size_max; |
2645 | unsigned char *addr; | |
8d39b4a6 | 2646 | void *data; |
69e3c75f | 2647 | int len_sum = 0; |
9e67030a | 2648 | int status = TP_STATUS_AVAILABLE; |
1d036d25 | 2649 | int hlen, tlen, copylen = 0; |
69e3c75f | 2650 | |
69e3c75f JB |
2651 | mutex_lock(&po->pg_vec_lock); |
2652 | ||
66e56cd4 | 2653 | if (likely(saddr == NULL)) { |
e40526cb | 2654 | dev = packet_cached_dev_get(po); |
69e3c75f JB |
2655 | proto = po->num; |
2656 | addr = NULL; | |
2657 | } else { | |
2658 | err = -EINVAL; | |
2659 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
2660 | goto out; | |
2661 | if (msg->msg_namelen < (saddr->sll_halen | |
2662 | + offsetof(struct sockaddr_ll, | |
2663 | sll_addr))) | |
2664 | goto out; | |
69e3c75f JB |
2665 | proto = saddr->sll_protocol; |
2666 | addr = saddr->sll_addr; | |
827d9780 | 2667 | dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
69e3c75f JB |
2668 | } |
2669 | ||
69e3c75f JB |
2670 | err = -ENXIO; |
2671 | if (unlikely(dev == NULL)) | |
2672 | goto out; | |
69e3c75f JB |
2673 | err = -ENETDOWN; |
2674 | if (unlikely(!(dev->flags & IFF_UP))) | |
2675 | goto out_put; | |
2676 | ||
d19b183c DCS |
2677 | sockc.tsflags = po->sk.sk_tsflags; |
2678 | if (msg->msg_controllen) { | |
2679 | err = sock_cmsg_send(&po->sk, msg, &sockc); | |
2680 | if (unlikely(err)) | |
2681 | goto out_put; | |
2682 | } | |
2683 | ||
5cfb4c8d DB |
2684 | if (po->sk.sk_socket->type == SOCK_RAW) |
2685 | reserve = dev->hard_header_len; | |
69e3c75f | 2686 | size_max = po->tx_ring.frame_size |
b5dd884e | 2687 | - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
69e3c75f | 2688 | |
1d036d25 | 2689 | if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr) |
5cfb4c8d | 2690 | size_max = dev->mtu + reserve + VLAN_HLEN; |
09effa67 | 2691 | |
69e3c75f JB |
2692 | do { |
2693 | ph = packet_current_frame(po, &po->tx_ring, | |
87a2fd28 | 2694 | TP_STATUS_SEND_REQUEST); |
69e3c75f | 2695 | if (unlikely(ph == NULL)) { |
87a2fd28 DB |
2696 | if (need_wait && need_resched()) |
2697 | schedule(); | |
69e3c75f JB |
2698 | continue; |
2699 | } | |
2700 | ||
8d39b4a6 WB |
2701 | skb = NULL; |
2702 | tp_len = tpacket_parse_header(po, ph, size_max, &data); | |
2703 | if (tp_len < 0) | |
2704 | goto tpacket_error; | |
2705 | ||
69e3c75f | 2706 | status = TP_STATUS_SEND_REQUEST; |
ae641949 HX |
2707 | hlen = LL_RESERVED_SPACE(dev); |
2708 | tlen = dev->needed_tailroom; | |
1d036d25 WB |
2709 | if (po->has_vnet_hdr) { |
2710 | vnet_hdr = data; | |
2711 | data += sizeof(*vnet_hdr); | |
2712 | tp_len -= sizeof(*vnet_hdr); | |
2713 | if (tp_len < 0 || | |
2714 | __packet_snd_vnet_parse(vnet_hdr, tp_len)) { | |
2715 | tp_len = -EINVAL; | |
2716 | goto tpacket_error; | |
2717 | } | |
2718 | copylen = __virtio16_to_cpu(vio_le(), | |
2719 | vnet_hdr->hdr_len); | |
2720 | } | |
9ed988cd | 2721 | copylen = max_t(int, copylen, dev->hard_header_len); |
69e3c75f | 2722 | skb = sock_alloc_send_skb(&po->sk, |
1d036d25 WB |
2723 | hlen + tlen + sizeof(struct sockaddr_ll) + |
2724 | (copylen - dev->hard_header_len), | |
fbf33a28 | 2725 | !need_wait, &err); |
69e3c75f | 2726 | |
fbf33a28 KM |
2727 | if (unlikely(skb == NULL)) { |
2728 | /* we assume the socket was initially writeable ... */ | |
2729 | if (likely(len_sum > 0)) | |
2730 | err = len_sum; | |
69e3c75f | 2731 | goto out_status; |
fbf33a28 | 2732 | } |
8d39b4a6 | 2733 | tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto, |
c14ac945 | 2734 | addr, hlen, copylen, &sockc); |
dbd46ab4 | 2735 | if (likely(tp_len >= 0) && |
5cfb4c8d | 2736 | tp_len > dev->mtu + reserve && |
1d036d25 | 2737 | !po->has_vnet_hdr && |
3c70c132 DB |
2738 | !packet_extra_vlan_len_allowed(dev, skb)) |
2739 | tp_len = -EMSGSIZE; | |
69e3c75f JB |
2740 | |
2741 | if (unlikely(tp_len < 0)) { | |
8d39b4a6 | 2742 | tpacket_error: |
69e3c75f JB |
2743 | if (po->tp_loss) { |
2744 | __packet_set_status(po, ph, | |
2745 | TP_STATUS_AVAILABLE); | |
2746 | packet_increment_head(&po->tx_ring); | |
2747 | kfree_skb(skb); | |
2748 | continue; | |
2749 | } else { | |
2750 | status = TP_STATUS_WRONG_FORMAT; | |
2751 | err = tp_len; | |
2752 | goto out_status; | |
2753 | } | |
2754 | } | |
2755 | ||
db60eb5f JR |
2756 | if (po->has_vnet_hdr && virtio_net_hdr_to_skb(skb, vnet_hdr, |
2757 | vio_le())) { | |
1d036d25 WB |
2758 | tp_len = -EINVAL; |
2759 | goto tpacket_error; | |
2760 | } | |
2761 | ||
69e3c75f JB |
2762 | skb->destructor = tpacket_destruct_skb; |
2763 | __packet_set_status(po, ph, TP_STATUS_SENDING); | |
b0138408 | 2764 | packet_inc_pending(&po->tx_ring); |
69e3c75f JB |
2765 | |
2766 | status = TP_STATUS_SEND_REQUEST; | |
d346a3fa | 2767 | err = po->xmit(skb); |
eb70df13 JP |
2768 | if (unlikely(err > 0)) { |
2769 | err = net_xmit_errno(err); | |
2770 | if (err && __packet_get_status(po, ph) == | |
2771 | TP_STATUS_AVAILABLE) { | |
2772 | /* skb was destructed already */ | |
2773 | skb = NULL; | |
2774 | goto out_status; | |
2775 | } | |
2776 | /* | |
2777 | * skb was dropped but not destructed yet; | |
2778 | * let's treat it like congestion or err < 0 | |
2779 | */ | |
2780 | err = 0; | |
2781 | } | |
69e3c75f JB |
2782 | packet_increment_head(&po->tx_ring); |
2783 | len_sum += tp_len; | |
b0138408 DB |
2784 | } while (likely((ph != NULL) || |
2785 | /* Note: packet_read_pending() might be slow if we have | |
2786 | * to call it as it's per_cpu variable, but in fast-path | |
2787 | * we already short-circuit the loop with the first | |
2788 | * condition, and luckily don't have to go that path | |
2789 | * anyway. | |
2790 | */ | |
2791 | (need_wait && packet_read_pending(&po->tx_ring)))); | |
69e3c75f JB |
2792 | |
2793 | err = len_sum; | |
2794 | goto out_put; | |
2795 | ||
69e3c75f JB |
2796 | out_status: |
2797 | __packet_set_status(po, ph, status); | |
2798 | kfree_skb(skb); | |
2799 | out_put: | |
e40526cb | 2800 | dev_put(dev); |
69e3c75f JB |
2801 | out: |
2802 | mutex_unlock(&po->pg_vec_lock); | |
2803 | return err; | |
2804 | } | |
69e3c75f | 2805 | |
eea49cc9 OJ |
2806 | static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
2807 | size_t reserve, size_t len, | |
2808 | size_t linear, int noblock, | |
2809 | int *err) | |
bfd5f4a3 SS |
2810 | { |
2811 | struct sk_buff *skb; | |
2812 | ||
2813 | /* Under a page? Don't bother with paged skb. */ | |
2814 | if (prepad + len < PAGE_SIZE || !linear) | |
2815 | linear = len; | |
2816 | ||
2817 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
28d64271 | 2818 | err, 0); |
bfd5f4a3 SS |
2819 | if (!skb) |
2820 | return NULL; | |
2821 | ||
2822 | skb_reserve(skb, reserve); | |
2823 | skb_put(skb, linear); | |
2824 | skb->data_len = len - linear; | |
2825 | skb->len += len - linear; | |
2826 | ||
2827 | return skb; | |
2828 | } | |
2829 | ||
d346a3fa | 2830 | static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
2831 | { |
2832 | struct sock *sk = sock->sk; | |
342dfc30 | 2833 | DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name); |
1da177e4 LT |
2834 | struct sk_buff *skb; |
2835 | struct net_device *dev; | |
0e11c91e | 2836 | __be16 proto; |
1da177e4 | 2837 | unsigned char *addr; |
827d9780 | 2838 | int err, reserve = 0; |
c7d39e32 | 2839 | struct sockcm_cookie sockc; |
bfd5f4a3 SS |
2840 | struct virtio_net_hdr vnet_hdr = { 0 }; |
2841 | int offset = 0; | |
bfd5f4a3 | 2842 | struct packet_sock *po = pkt_sk(sk); |
da7c9561 | 2843 | bool has_vnet_hdr = false; |
57031eb7 | 2844 | int hlen, tlen, linear; |
3bdc0eba | 2845 | int extra_len = 0; |
1da177e4 LT |
2846 | |
2847 | /* | |
1ce4f28b | 2848 | * Get and verify the address. |
1da177e4 | 2849 | */ |
1ce4f28b | 2850 | |
66e56cd4 | 2851 | if (likely(saddr == NULL)) { |
e40526cb | 2852 | dev = packet_cached_dev_get(po); |
1da177e4 LT |
2853 | proto = po->num; |
2854 | addr = NULL; | |
2855 | } else { | |
2856 | err = -EINVAL; | |
2857 | if (msg->msg_namelen < sizeof(struct sockaddr_ll)) | |
2858 | goto out; | |
0fb375fb EB |
2859 | if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
2860 | goto out; | |
1da177e4 LT |
2861 | proto = saddr->sll_protocol; |
2862 | addr = saddr->sll_addr; | |
827d9780 | 2863 | dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
1da177e4 LT |
2864 | } |
2865 | ||
1da177e4 | 2866 | err = -ENXIO; |
e40526cb | 2867 | if (unlikely(dev == NULL)) |
1da177e4 | 2868 | goto out_unlock; |
d5e76b0a | 2869 | err = -ENETDOWN; |
e40526cb | 2870 | if (unlikely(!(dev->flags & IFF_UP))) |
d5e76b0a DM |
2871 | goto out_unlock; |
2872 | ||
edbe7746 | 2873 | sockc.tsflags = sk->sk_tsflags; |
c7d39e32 EJ |
2874 | sockc.mark = sk->sk_mark; |
2875 | if (msg->msg_controllen) { | |
2876 | err = sock_cmsg_send(sk, msg, &sockc); | |
2877 | if (unlikely(err)) | |
2878 | goto out_unlock; | |
2879 | } | |
2880 | ||
e40526cb DB |
2881 | if (sock->type == SOCK_RAW) |
2882 | reserve = dev->hard_header_len; | |
bfd5f4a3 | 2883 | if (po->has_vnet_hdr) { |
16cc1400 WB |
2884 | err = packet_snd_vnet_parse(msg, &len, &vnet_hdr); |
2885 | if (err) | |
bfd5f4a3 | 2886 | goto out_unlock; |
da7c9561 | 2887 | has_vnet_hdr = true; |
bfd5f4a3 SS |
2888 | } |
2889 | ||
3bdc0eba BG |
2890 | if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
2891 | if (!netif_supports_nofcs(dev)) { | |
2892 | err = -EPROTONOSUPPORT; | |
2893 | goto out_unlock; | |
2894 | } | |
2895 | extra_len = 4; /* We're doing our own CRC */ | |
2896 | } | |
2897 | ||
1da177e4 | 2898 | err = -EMSGSIZE; |
16cc1400 WB |
2899 | if (!vnet_hdr.gso_type && |
2900 | (len > dev->mtu + reserve + VLAN_HLEN + extra_len)) | |
1da177e4 LT |
2901 | goto out_unlock; |
2902 | ||
bfd5f4a3 | 2903 | err = -ENOBUFS; |
ae641949 HX |
2904 | hlen = LL_RESERVED_SPACE(dev); |
2905 | tlen = dev->needed_tailroom; | |
57031eb7 WB |
2906 | linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len); |
2907 | linear = max(linear, min_t(int, len, dev->hard_header_len)); | |
2908 | skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear, | |
bfd5f4a3 | 2909 | msg->msg_flags & MSG_DONTWAIT, &err); |
40d4e3df | 2910 | if (skb == NULL) |
1da177e4 LT |
2911 | goto out_unlock; |
2912 | ||
bfd5f4a3 | 2913 | skb_set_network_header(skb, reserve); |
1da177e4 | 2914 | |
0c4e8581 | 2915 | err = -EINVAL; |
9c707762 WB |
2916 | if (sock->type == SOCK_DGRAM) { |
2917 | offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len); | |
46d2cfb1 | 2918 | if (unlikely(offset < 0)) |
9c707762 | 2919 | goto out_free; |
9c707762 | 2920 | } |
1da177e4 LT |
2921 | |
2922 | /* Returns -EFAULT on error */ | |
c0371da6 | 2923 | err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len); |
1da177e4 LT |
2924 | if (err) |
2925 | goto out_free; | |
bf84a010 | 2926 | |
9ed988cd WB |
2927 | if (sock->type == SOCK_RAW && |
2928 | !dev_validate_header(dev, skb->data, len)) { | |
2929 | err = -EINVAL; | |
2930 | goto out_free; | |
2931 | } | |
2932 | ||
c14ac945 | 2933 | sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags); |
1da177e4 | 2934 | |
16cc1400 | 2935 | if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) && |
3c70c132 DB |
2936 | !packet_extra_vlan_len_allowed(dev, skb)) { |
2937 | err = -EMSGSIZE; | |
2938 | goto out_free; | |
57f89bfa BG |
2939 | } |
2940 | ||
09effa67 DM |
2941 | skb->protocol = proto; |
2942 | skb->dev = dev; | |
1da177e4 | 2943 | skb->priority = sk->sk_priority; |
c7d39e32 | 2944 | skb->mark = sockc.mark; |
0fd5d57b | 2945 | |
da7c9561 | 2946 | if (has_vnet_hdr) { |
db60eb5f | 2947 | err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le()); |
16cc1400 WB |
2948 | if (err) |
2949 | goto out_free; | |
2950 | len += sizeof(vnet_hdr); | |
bfd5f4a3 SS |
2951 | } |
2952 | ||
8fd6c80d DB |
2953 | skb_probe_transport_header(skb, reserve); |
2954 | ||
3bdc0eba BG |
2955 | if (unlikely(extra_len == 4)) |
2956 | skb->no_fcs = 1; | |
2957 | ||
d346a3fa | 2958 | err = po->xmit(skb); |
1da177e4 LT |
2959 | if (err > 0 && (err = net_xmit_errno(err)) != 0) |
2960 | goto out_unlock; | |
2961 | ||
e40526cb | 2962 | dev_put(dev); |
1da177e4 | 2963 | |
40d4e3df | 2964 | return len; |
1da177e4 LT |
2965 | |
2966 | out_free: | |
2967 | kfree_skb(skb); | |
2968 | out_unlock: | |
e40526cb | 2969 | if (dev) |
1da177e4 LT |
2970 | dev_put(dev); |
2971 | out: | |
2972 | return err; | |
2973 | } | |
2974 | ||
1b784140 | 2975 | static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
69e3c75f | 2976 | { |
69e3c75f JB |
2977 | struct sock *sk = sock->sk; |
2978 | struct packet_sock *po = pkt_sk(sk); | |
d346a3fa | 2979 | |
69e3c75f JB |
2980 | if (po->tx_ring.pg_vec) |
2981 | return tpacket_snd(po, msg); | |
2982 | else | |
69e3c75f JB |
2983 | return packet_snd(sock, msg, len); |
2984 | } | |
2985 | ||
1da177e4 LT |
2986 | /* |
2987 | * Close a PACKET socket. This is fairly simple. We immediately go | |
2988 | * to 'closed' state and remove our protocol entry in the device list. | |
2989 | */ | |
2990 | ||
2991 | static int packet_release(struct socket *sock) | |
2992 | { | |
2993 | struct sock *sk = sock->sk; | |
2994 | struct packet_sock *po; | |
2bd624b4 | 2995 | struct packet_fanout *f; |
d12d01d6 | 2996 | struct net *net; |
f6fb8f10 | 2997 | union tpacket_req_u req_u; |
1da177e4 LT |
2998 | |
2999 | if (!sk) | |
3000 | return 0; | |
3001 | ||
3b1e0a65 | 3002 | net = sock_net(sk); |
1da177e4 LT |
3003 | po = pkt_sk(sk); |
3004 | ||
0fa7fa98 | 3005 | mutex_lock(&net->packet.sklist_lock); |
808f5114 | 3006 | sk_del_node_init_rcu(sk); |
0fa7fa98 PE |
3007 | mutex_unlock(&net->packet.sklist_lock); |
3008 | ||
3009 | preempt_disable(); | |
920de804 | 3010 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
0fa7fa98 | 3011 | preempt_enable(); |
1da177e4 | 3012 | |
808f5114 | 3013 | spin_lock(&po->bind_lock); |
ce06b03e | 3014 | unregister_prot_hook(sk, false); |
66e56cd4 DB |
3015 | packet_cached_dev_reset(po); |
3016 | ||
160ff18a BG |
3017 | if (po->prot_hook.dev) { |
3018 | dev_put(po->prot_hook.dev); | |
3019 | po->prot_hook.dev = NULL; | |
3020 | } | |
808f5114 | 3021 | spin_unlock(&po->bind_lock); |
1da177e4 | 3022 | |
1da177e4 | 3023 | packet_flush_mclist(sk); |
1da177e4 | 3024 | |
9665d5d6 PS |
3025 | if (po->rx_ring.pg_vec) { |
3026 | memset(&req_u, 0, sizeof(req_u)); | |
f6fb8f10 | 3027 | packet_set_ring(sk, &req_u, 1, 0); |
9665d5d6 | 3028 | } |
69e3c75f | 3029 | |
9665d5d6 PS |
3030 | if (po->tx_ring.pg_vec) { |
3031 | memset(&req_u, 0, sizeof(req_u)); | |
f6fb8f10 | 3032 | packet_set_ring(sk, &req_u, 1, 1); |
9665d5d6 | 3033 | } |
1da177e4 | 3034 | |
2bd624b4 | 3035 | f = fanout_release(sk); |
dc99f600 | 3036 | |
808f5114 | 3037 | synchronize_net(); |
2bd624b4 AS |
3038 | |
3039 | if (f) { | |
3040 | fanout_release_data(f); | |
3041 | kfree(f); | |
3042 | } | |
1da177e4 LT |
3043 | /* |
3044 | * Now the socket is dead. No more input will appear. | |
3045 | */ | |
1da177e4 LT |
3046 | sock_orphan(sk); |
3047 | sock->sk = NULL; | |
3048 | ||
3049 | /* Purge queues */ | |
3050 | ||
3051 | skb_queue_purge(&sk->sk_receive_queue); | |
b0138408 | 3052 | packet_free_pending(po); |
17ab56a2 | 3053 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
3054 | |
3055 | sock_put(sk); | |
3056 | return 0; | |
3057 | } | |
3058 | ||
3059 | /* | |
3060 | * Attach a packet hook. | |
3061 | */ | |
3062 | ||
30f7ea1c FR |
3063 | static int packet_do_bind(struct sock *sk, const char *name, int ifindex, |
3064 | __be16 proto) | |
1da177e4 LT |
3065 | { |
3066 | struct packet_sock *po = pkt_sk(sk); | |
158cd4af | 3067 | struct net_device *dev_curr; |
902fefb8 DB |
3068 | __be16 proto_curr; |
3069 | bool need_rehook; | |
30f7ea1c FR |
3070 | struct net_device *dev = NULL; |
3071 | int ret = 0; | |
3072 | bool unlisted = false; | |
dc99f600 | 3073 | |
1da177e4 | 3074 | lock_sock(sk); |
1da177e4 | 3075 | spin_lock(&po->bind_lock); |
30f7ea1c FR |
3076 | rcu_read_lock(); |
3077 | ||
4971613c WB |
3078 | if (po->fanout) { |
3079 | ret = -EINVAL; | |
3080 | goto out_unlock; | |
3081 | } | |
3082 | ||
30f7ea1c FR |
3083 | if (name) { |
3084 | dev = dev_get_by_name_rcu(sock_net(sk), name); | |
3085 | if (!dev) { | |
3086 | ret = -ENODEV; | |
3087 | goto out_unlock; | |
3088 | } | |
3089 | } else if (ifindex) { | |
3090 | dev = dev_get_by_index_rcu(sock_net(sk), ifindex); | |
3091 | if (!dev) { | |
3092 | ret = -ENODEV; | |
3093 | goto out_unlock; | |
3094 | } | |
3095 | } | |
3096 | ||
3097 | if (dev) | |
3098 | dev_hold(dev); | |
66e56cd4 | 3099 | |
902fefb8 DB |
3100 | proto_curr = po->prot_hook.type; |
3101 | dev_curr = po->prot_hook.dev; | |
3102 | ||
3103 | need_rehook = proto_curr != proto || dev_curr != dev; | |
3104 | ||
3105 | if (need_rehook) { | |
30f7ea1c FR |
3106 | if (po->running) { |
3107 | rcu_read_unlock(); | |
3108 | __unregister_prot_hook(sk, true); | |
3109 | rcu_read_lock(); | |
3110 | dev_curr = po->prot_hook.dev; | |
3111 | if (dev) | |
3112 | unlisted = !dev_get_by_index_rcu(sock_net(sk), | |
3113 | dev->ifindex); | |
3114 | } | |
1da177e4 | 3115 | |
902fefb8 DB |
3116 | po->num = proto; |
3117 | po->prot_hook.type = proto; | |
902fefb8 | 3118 | |
30f7ea1c FR |
3119 | if (unlikely(unlisted)) { |
3120 | dev_put(dev); | |
3121 | po->prot_hook.dev = NULL; | |
3122 | po->ifindex = -1; | |
3123 | packet_cached_dev_reset(po); | |
3124 | } else { | |
3125 | po->prot_hook.dev = dev; | |
3126 | po->ifindex = dev ? dev->ifindex : 0; | |
3127 | packet_cached_dev_assign(po, dev); | |
3128 | } | |
902fefb8 | 3129 | } |
158cd4af LW |
3130 | if (dev_curr) |
3131 | dev_put(dev_curr); | |
66e56cd4 | 3132 | |
902fefb8 | 3133 | if (proto == 0 || !need_rehook) |
1da177e4 LT |
3134 | goto out_unlock; |
3135 | ||
30f7ea1c | 3136 | if (!unlisted && (!dev || (dev->flags & IFF_UP))) { |
ce06b03e | 3137 | register_prot_hook(sk); |
be85d4ad UT |
3138 | } else { |
3139 | sk->sk_err = ENETDOWN; | |
3140 | if (!sock_flag(sk, SOCK_DEAD)) | |
3141 | sk->sk_error_report(sk); | |
1da177e4 LT |
3142 | } |
3143 | ||
3144 | out_unlock: | |
30f7ea1c | 3145 | rcu_read_unlock(); |
1da177e4 LT |
3146 | spin_unlock(&po->bind_lock); |
3147 | release_sock(sk); | |
30f7ea1c | 3148 | return ret; |
1da177e4 LT |
3149 | } |
3150 | ||
3151 | /* | |
3152 | * Bind a packet socket to a device | |
3153 | */ | |
3154 | ||
40d4e3df ED |
3155 | static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, |
3156 | int addr_len) | |
1da177e4 | 3157 | { |
40d4e3df | 3158 | struct sock *sk = sock->sk; |
540e2894 | 3159 | char name[sizeof(uaddr->sa_data) + 1]; |
1ce4f28b | 3160 | |
1da177e4 LT |
3161 | /* |
3162 | * Check legality | |
3163 | */ | |
1ce4f28b | 3164 | |
8ae55f04 | 3165 | if (addr_len != sizeof(struct sockaddr)) |
1da177e4 | 3166 | return -EINVAL; |
540e2894 AP |
3167 | /* uaddr->sa_data comes from the userspace, it's not guaranteed to be |
3168 | * zero-terminated. | |
3169 | */ | |
3170 | memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data)); | |
3171 | name[sizeof(uaddr->sa_data)] = 0; | |
1da177e4 | 3172 | |
30f7ea1c | 3173 | return packet_do_bind(sk, name, 0, pkt_sk(sk)->num); |
1da177e4 | 3174 | } |
1da177e4 LT |
3175 | |
3176 | static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
3177 | { | |
40d4e3df ED |
3178 | struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr; |
3179 | struct sock *sk = sock->sk; | |
1da177e4 LT |
3180 | |
3181 | /* | |
3182 | * Check legality | |
3183 | */ | |
1ce4f28b | 3184 | |
1da177e4 LT |
3185 | if (addr_len < sizeof(struct sockaddr_ll)) |
3186 | return -EINVAL; | |
3187 | if (sll->sll_family != AF_PACKET) | |
3188 | return -EINVAL; | |
3189 | ||
30f7ea1c FR |
3190 | return packet_do_bind(sk, NULL, sll->sll_ifindex, |
3191 | sll->sll_protocol ? : pkt_sk(sk)->num); | |
1da177e4 LT |
3192 | } |
3193 | ||
3194 | static struct proto packet_proto = { | |
3195 | .name = "PACKET", | |
3196 | .owner = THIS_MODULE, | |
3197 | .obj_size = sizeof(struct packet_sock), | |
3198 | }; | |
3199 | ||
3200 | /* | |
1ce4f28b | 3201 | * Create a packet of type SOCK_PACKET. |
1da177e4 LT |
3202 | */ |
3203 | ||
3f378b68 EP |
3204 | static int packet_create(struct net *net, struct socket *sock, int protocol, |
3205 | int kern) | |
1da177e4 LT |
3206 | { |
3207 | struct sock *sk; | |
3208 | struct packet_sock *po; | |
0e11c91e | 3209 | __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
1da177e4 LT |
3210 | int err; |
3211 | ||
df008c91 | 3212 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
1da177e4 | 3213 | return -EPERM; |
be02097c DM |
3214 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
3215 | sock->type != SOCK_PACKET) | |
1da177e4 LT |
3216 | return -ESOCKTNOSUPPORT; |
3217 | ||
3218 | sock->state = SS_UNCONNECTED; | |
3219 | ||
3220 | err = -ENOBUFS; | |
11aa9c28 | 3221 | sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern); |
1da177e4 LT |
3222 | if (sk == NULL) |
3223 | goto out; | |
3224 | ||
3225 | sock->ops = &packet_ops; | |
1da177e4 LT |
3226 | if (sock->type == SOCK_PACKET) |
3227 | sock->ops = &packet_ops_spkt; | |
be02097c | 3228 | |
1da177e4 LT |
3229 | sock_init_data(sock, sk); |
3230 | ||
3231 | po = pkt_sk(sk); | |
3232 | sk->sk_family = PF_PACKET; | |
0e11c91e | 3233 | po->num = proto; |
d346a3fa | 3234 | po->xmit = dev_queue_xmit; |
66e56cd4 | 3235 | |
b0138408 DB |
3236 | err = packet_alloc_pending(po); |
3237 | if (err) | |
3238 | goto out2; | |
3239 | ||
66e56cd4 | 3240 | packet_cached_dev_reset(po); |
1da177e4 LT |
3241 | |
3242 | sk->sk_destruct = packet_sock_destruct; | |
17ab56a2 | 3243 | sk_refcnt_debug_inc(sk); |
1da177e4 LT |
3244 | |
3245 | /* | |
3246 | * Attach a protocol block | |
3247 | */ | |
3248 | ||
3249 | spin_lock_init(&po->bind_lock); | |
905db440 | 3250 | mutex_init(&po->pg_vec_lock); |
0648ab70 | 3251 | po->rollover = NULL; |
1da177e4 | 3252 | po->prot_hook.func = packet_rcv; |
be02097c | 3253 | |
1da177e4 LT |
3254 | if (sock->type == SOCK_PACKET) |
3255 | po->prot_hook.func = packet_rcv_spkt; | |
be02097c | 3256 | |
1da177e4 LT |
3257 | po->prot_hook.af_packet_priv = sk; |
3258 | ||
0e11c91e AV |
3259 | if (proto) { |
3260 | po->prot_hook.type = proto; | |
ce06b03e | 3261 | register_prot_hook(sk); |
1da177e4 LT |
3262 | } |
3263 | ||
0fa7fa98 | 3264 | mutex_lock(&net->packet.sklist_lock); |
808f5114 | 3265 | sk_add_node_rcu(sk, &net->packet.sklist); |
0fa7fa98 PE |
3266 | mutex_unlock(&net->packet.sklist_lock); |
3267 | ||
3268 | preempt_disable(); | |
3680453c | 3269 | sock_prot_inuse_add(net, &packet_proto, 1); |
0fa7fa98 | 3270 | preempt_enable(); |
808f5114 | 3271 | |
40d4e3df | 3272 | return 0; |
b0138408 DB |
3273 | out2: |
3274 | sk_free(sk); | |
1da177e4 LT |
3275 | out: |
3276 | return err; | |
3277 | } | |
3278 | ||
3279 | /* | |
3280 | * Pull a packet from our receive queue and hand it to the user. | |
3281 | * If necessary we block. | |
3282 | */ | |
3283 | ||
1b784140 YX |
3284 | static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
3285 | int flags) | |
1da177e4 LT |
3286 | { |
3287 | struct sock *sk = sock->sk; | |
3288 | struct sk_buff *skb; | |
3289 | int copied, err; | |
bfd5f4a3 | 3290 | int vnet_hdr_len = 0; |
2472d761 | 3291 | unsigned int origlen = 0; |
1da177e4 LT |
3292 | |
3293 | err = -EINVAL; | |
ed85b565 | 3294 | if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
1da177e4 LT |
3295 | goto out; |
3296 | ||
3297 | #if 0 | |
3298 | /* What error should we return now? EUNATTACH? */ | |
3299 | if (pkt_sk(sk)->ifindex < 0) | |
3300 | return -ENODEV; | |
3301 | #endif | |
3302 | ||
ed85b565 | 3303 | if (flags & MSG_ERRQUEUE) { |
cb820f8e RC |
3304 | err = sock_recv_errqueue(sk, msg, len, |
3305 | SOL_PACKET, PACKET_TX_TIMESTAMP); | |
ed85b565 RC |
3306 | goto out; |
3307 | } | |
3308 | ||
1da177e4 LT |
3309 | /* |
3310 | * Call the generic datagram receiver. This handles all sorts | |
3311 | * of horrible races and re-entrancy so we can forget about it | |
3312 | * in the protocol layers. | |
3313 | * | |
3314 | * Now it will return ENETDOWN, if device have just gone down, | |
3315 | * but then it will block. | |
3316 | */ | |
3317 | ||
40d4e3df | 3318 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
3319 | |
3320 | /* | |
1ce4f28b | 3321 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
3322 | * handles the blocking we don't see and worry about blocking |
3323 | * retries. | |
3324 | */ | |
3325 | ||
8ae55f04 | 3326 | if (skb == NULL) |
1da177e4 LT |
3327 | goto out; |
3328 | ||
2ccdbaa6 WB |
3329 | if (pkt_sk(sk)->pressure) |
3330 | packet_rcv_has_room(pkt_sk(sk), NULL); | |
3331 | ||
bfd5f4a3 | 3332 | if (pkt_sk(sk)->has_vnet_hdr) { |
16cc1400 WB |
3333 | err = packet_rcv_vnet(msg, skb, &len); |
3334 | if (err) | |
bfd5f4a3 | 3335 | goto out_free; |
16cc1400 | 3336 | vnet_hdr_len = sizeof(struct virtio_net_hdr); |
bfd5f4a3 SS |
3337 | } |
3338 | ||
f3d33426 HFS |
3339 | /* You lose any data beyond the buffer you gave. If it worries |
3340 | * a user program they can ask the device for its MTU | |
3341 | * anyway. | |
1da177e4 | 3342 | */ |
1da177e4 | 3343 | copied = skb->len; |
40d4e3df ED |
3344 | if (copied > len) { |
3345 | copied = len; | |
3346 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
3347 | } |
3348 | ||
51f3d02b | 3349 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 LT |
3350 | if (err) |
3351 | goto out_free; | |
3352 | ||
2472d761 EB |
3353 | if (sock->type != SOCK_PACKET) { |
3354 | struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; | |
3355 | ||
3356 | /* Original length was stored in sockaddr_ll fields */ | |
3357 | origlen = PACKET_SKB_CB(skb)->sa.origlen; | |
3358 | sll->sll_family = AF_PACKET; | |
3359 | sll->sll_protocol = skb->protocol; | |
3360 | } | |
3361 | ||
3b885787 | 3362 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 | 3363 | |
f3d33426 HFS |
3364 | if (msg->msg_name) { |
3365 | /* If the address length field is there to be filled | |
3366 | * in, we fill it in now. | |
3367 | */ | |
3368 | if (sock->type == SOCK_PACKET) { | |
342dfc30 | 3369 | __sockaddr_check_size(sizeof(struct sockaddr_pkt)); |
f3d33426 HFS |
3370 | msg->msg_namelen = sizeof(struct sockaddr_pkt); |
3371 | } else { | |
3372 | struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; | |
2472d761 | 3373 | |
f3d33426 HFS |
3374 | msg->msg_namelen = sll->sll_halen + |
3375 | offsetof(struct sockaddr_ll, sll_addr); | |
3376 | } | |
ffbc6111 HX |
3377 | memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
3378 | msg->msg_namelen); | |
f3d33426 | 3379 | } |
1da177e4 | 3380 | |
8dc41944 | 3381 | if (pkt_sk(sk)->auxdata) { |
ffbc6111 HX |
3382 | struct tpacket_auxdata aux; |
3383 | ||
3384 | aux.tp_status = TP_STATUS_USER; | |
3385 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
3386 | aux.tp_status |= TP_STATUS_CSUMNOTREADY; | |
682f048b AD |
3387 | else if (skb->pkt_type != PACKET_OUTGOING && |
3388 | (skb->ip_summed == CHECKSUM_COMPLETE || | |
3389 | skb_csum_unnecessary(skb))) | |
3390 | aux.tp_status |= TP_STATUS_CSUM_VALID; | |
3391 | ||
2472d761 | 3392 | aux.tp_len = origlen; |
ffbc6111 HX |
3393 | aux.tp_snaplen = skb->len; |
3394 | aux.tp_mac = 0; | |
bbe735e4 | 3395 | aux.tp_net = skb_network_offset(skb); |
df8a39de JP |
3396 | if (skb_vlan_tag_present(skb)) { |
3397 | aux.tp_vlan_tci = skb_vlan_tag_get(skb); | |
a0cdfcf3 AW |
3398 | aux.tp_vlan_tpid = ntohs(skb->vlan_proto); |
3399 | aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; | |
a3bcc23e BG |
3400 | } else { |
3401 | aux.tp_vlan_tci = 0; | |
a0cdfcf3 | 3402 | aux.tp_vlan_tpid = 0; |
a3bcc23e | 3403 | } |
ffbc6111 | 3404 | put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
8dc41944 HX |
3405 | } |
3406 | ||
1da177e4 LT |
3407 | /* |
3408 | * Free or return the buffer as appropriate. Again this | |
3409 | * hides all the races and re-entrancy issues from us. | |
3410 | */ | |
bfd5f4a3 | 3411 | err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
1da177e4 LT |
3412 | |
3413 | out_free: | |
3414 | skb_free_datagram(sk, skb); | |
3415 | out: | |
3416 | return err; | |
3417 | } | |
3418 | ||
1da177e4 LT |
3419 | static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
3420 | int *uaddr_len, int peer) | |
3421 | { | |
3422 | struct net_device *dev; | |
3423 | struct sock *sk = sock->sk; | |
3424 | ||
3425 | if (peer) | |
3426 | return -EOPNOTSUPP; | |
3427 | ||
3428 | uaddr->sa_family = AF_PACKET; | |
2dc85bf3 | 3429 | memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data)); |
654d1f8a ED |
3430 | rcu_read_lock(); |
3431 | dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); | |
3432 | if (dev) | |
2dc85bf3 | 3433 | strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data)); |
654d1f8a | 3434 | rcu_read_unlock(); |
1da177e4 LT |
3435 | *uaddr_len = sizeof(*uaddr); |
3436 | ||
3437 | return 0; | |
3438 | } | |
1da177e4 LT |
3439 | |
3440 | static int packet_getname(struct socket *sock, struct sockaddr *uaddr, | |
3441 | int *uaddr_len, int peer) | |
3442 | { | |
3443 | struct net_device *dev; | |
3444 | struct sock *sk = sock->sk; | |
3445 | struct packet_sock *po = pkt_sk(sk); | |
13cfa97b | 3446 | DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
1da177e4 LT |
3447 | |
3448 | if (peer) | |
3449 | return -EOPNOTSUPP; | |
3450 | ||
3451 | sll->sll_family = AF_PACKET; | |
3452 | sll->sll_ifindex = po->ifindex; | |
3453 | sll->sll_protocol = po->num; | |
67286640 | 3454 | sll->sll_pkttype = 0; |
654d1f8a ED |
3455 | rcu_read_lock(); |
3456 | dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex); | |
1da177e4 LT |
3457 | if (dev) { |
3458 | sll->sll_hatype = dev->type; | |
3459 | sll->sll_halen = dev->addr_len; | |
3460 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1da177e4 LT |
3461 | } else { |
3462 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
3463 | sll->sll_halen = 0; | |
3464 | } | |
654d1f8a | 3465 | rcu_read_unlock(); |
0fb375fb | 3466 | *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
1da177e4 LT |
3467 | |
3468 | return 0; | |
3469 | } | |
3470 | ||
2aeb0b88 WC |
3471 | static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
3472 | int what) | |
1da177e4 LT |
3473 | { |
3474 | switch (i->type) { | |
3475 | case PACKET_MR_MULTICAST: | |
1162563f JP |
3476 | if (i->alen != dev->addr_len) |
3477 | return -EINVAL; | |
1da177e4 | 3478 | if (what > 0) |
22bedad3 | 3479 | return dev_mc_add(dev, i->addr); |
1da177e4 | 3480 | else |
22bedad3 | 3481 | return dev_mc_del(dev, i->addr); |
1da177e4 LT |
3482 | break; |
3483 | case PACKET_MR_PROMISC: | |
2aeb0b88 | 3484 | return dev_set_promiscuity(dev, what); |
1da177e4 | 3485 | case PACKET_MR_ALLMULTI: |
2aeb0b88 | 3486 | return dev_set_allmulti(dev, what); |
d95ed927 | 3487 | case PACKET_MR_UNICAST: |
1162563f JP |
3488 | if (i->alen != dev->addr_len) |
3489 | return -EINVAL; | |
d95ed927 | 3490 | if (what > 0) |
a748ee24 | 3491 | return dev_uc_add(dev, i->addr); |
d95ed927 | 3492 | else |
a748ee24 | 3493 | return dev_uc_del(dev, i->addr); |
d95ed927 | 3494 | break; |
40d4e3df ED |
3495 | default: |
3496 | break; | |
1da177e4 | 3497 | } |
2aeb0b88 | 3498 | return 0; |
1da177e4 LT |
3499 | } |
3500 | ||
82f17091 FR |
3501 | static void packet_dev_mclist_delete(struct net_device *dev, |
3502 | struct packet_mclist **mlp) | |
1da177e4 | 3503 | { |
82f17091 FR |
3504 | struct packet_mclist *ml; |
3505 | ||
3506 | while ((ml = *mlp) != NULL) { | |
3507 | if (ml->ifindex == dev->ifindex) { | |
3508 | packet_dev_mc(dev, ml, -1); | |
3509 | *mlp = ml->next; | |
3510 | kfree(ml); | |
3511 | } else | |
3512 | mlp = &ml->next; | |
1da177e4 LT |
3513 | } |
3514 | } | |
3515 | ||
0fb375fb | 3516 | static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
3517 | { |
3518 | struct packet_sock *po = pkt_sk(sk); | |
3519 | struct packet_mclist *ml, *i; | |
3520 | struct net_device *dev; | |
3521 | int err; | |
3522 | ||
3523 | rtnl_lock(); | |
3524 | ||
3525 | err = -ENODEV; | |
3b1e0a65 | 3526 | dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex); |
1da177e4 LT |
3527 | if (!dev) |
3528 | goto done; | |
3529 | ||
3530 | err = -EINVAL; | |
1162563f | 3531 | if (mreq->mr_alen > dev->addr_len) |
1da177e4 LT |
3532 | goto done; |
3533 | ||
3534 | err = -ENOBUFS; | |
8b3a7005 | 3535 | i = kmalloc(sizeof(*i), GFP_KERNEL); |
1da177e4 LT |
3536 | if (i == NULL) |
3537 | goto done; | |
3538 | ||
3539 | err = 0; | |
3540 | for (ml = po->mclist; ml; ml = ml->next) { | |
3541 | if (ml->ifindex == mreq->mr_ifindex && | |
3542 | ml->type == mreq->mr_type && | |
3543 | ml->alen == mreq->mr_alen && | |
3544 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
3545 | ml->count++; | |
3546 | /* Free the new element ... */ | |
3547 | kfree(i); | |
3548 | goto done; | |
3549 | } | |
3550 | } | |
3551 | ||
3552 | i->type = mreq->mr_type; | |
3553 | i->ifindex = mreq->mr_ifindex; | |
3554 | i->alen = mreq->mr_alen; | |
3555 | memcpy(i->addr, mreq->mr_address, i->alen); | |
309cf37f | 3556 | memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen); |
1da177e4 LT |
3557 | i->count = 1; |
3558 | i->next = po->mclist; | |
3559 | po->mclist = i; | |
2aeb0b88 WC |
3560 | err = packet_dev_mc(dev, i, 1); |
3561 | if (err) { | |
3562 | po->mclist = i->next; | |
3563 | kfree(i); | |
3564 | } | |
1da177e4 LT |
3565 | |
3566 | done: | |
3567 | rtnl_unlock(); | |
3568 | return err; | |
3569 | } | |
3570 | ||
0fb375fb | 3571 | static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq) |
1da177e4 LT |
3572 | { |
3573 | struct packet_mclist *ml, **mlp; | |
3574 | ||
3575 | rtnl_lock(); | |
3576 | ||
3577 | for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) { | |
3578 | if (ml->ifindex == mreq->mr_ifindex && | |
3579 | ml->type == mreq->mr_type && | |
3580 | ml->alen == mreq->mr_alen && | |
3581 | memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { | |
3582 | if (--ml->count == 0) { | |
3583 | struct net_device *dev; | |
3584 | *mlp = ml->next; | |
ad959e76 ED |
3585 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
3586 | if (dev) | |
1da177e4 | 3587 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
3588 | kfree(ml); |
3589 | } | |
82f17091 | 3590 | break; |
1da177e4 LT |
3591 | } |
3592 | } | |
3593 | rtnl_unlock(); | |
82f17091 | 3594 | return 0; |
1da177e4 LT |
3595 | } |
3596 | ||
3597 | static void packet_flush_mclist(struct sock *sk) | |
3598 | { | |
3599 | struct packet_sock *po = pkt_sk(sk); | |
3600 | struct packet_mclist *ml; | |
3601 | ||
3602 | if (!po->mclist) | |
3603 | return; | |
3604 | ||
3605 | rtnl_lock(); | |
3606 | while ((ml = po->mclist) != NULL) { | |
3607 | struct net_device *dev; | |
3608 | ||
3609 | po->mclist = ml->next; | |
ad959e76 ED |
3610 | dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
3611 | if (dev != NULL) | |
1da177e4 | 3612 | packet_dev_mc(dev, ml, -1); |
1da177e4 LT |
3613 | kfree(ml); |
3614 | } | |
3615 | rtnl_unlock(); | |
3616 | } | |
1da177e4 LT |
3617 | |
3618 | static int | |
b7058842 | 3619 | packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
3620 | { |
3621 | struct sock *sk = sock->sk; | |
8dc41944 | 3622 | struct packet_sock *po = pkt_sk(sk); |
1da177e4 LT |
3623 | int ret; |
3624 | ||
3625 | if (level != SOL_PACKET) | |
3626 | return -ENOPROTOOPT; | |
3627 | ||
69e3c75f | 3628 | switch (optname) { |
1ce4f28b | 3629 | case PACKET_ADD_MEMBERSHIP: |
1da177e4 LT |
3630 | case PACKET_DROP_MEMBERSHIP: |
3631 | { | |
0fb375fb EB |
3632 | struct packet_mreq_max mreq; |
3633 | int len = optlen; | |
3634 | memset(&mreq, 0, sizeof(mreq)); | |
3635 | if (len < sizeof(struct packet_mreq)) | |
1da177e4 | 3636 | return -EINVAL; |
0fb375fb EB |
3637 | if (len > sizeof(mreq)) |
3638 | len = sizeof(mreq); | |
40d4e3df | 3639 | if (copy_from_user(&mreq, optval, len)) |
1da177e4 | 3640 | return -EFAULT; |
0fb375fb EB |
3641 | if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
3642 | return -EINVAL; | |
1da177e4 LT |
3643 | if (optname == PACKET_ADD_MEMBERSHIP) |
3644 | ret = packet_mc_add(sk, &mreq); | |
3645 | else | |
3646 | ret = packet_mc_drop(sk, &mreq); | |
3647 | return ret; | |
3648 | } | |
a2efcfa0 | 3649 | |
1da177e4 | 3650 | case PACKET_RX_RING: |
69e3c75f | 3651 | case PACKET_TX_RING: |
1da177e4 | 3652 | { |
f6fb8f10 | 3653 | union tpacket_req_u req_u; |
3654 | int len; | |
1da177e4 | 3655 | |
f6fb8f10 | 3656 | switch (po->tp_version) { |
3657 | case TPACKET_V1: | |
3658 | case TPACKET_V2: | |
3659 | len = sizeof(req_u.req); | |
3660 | break; | |
3661 | case TPACKET_V3: | |
3662 | default: | |
3663 | len = sizeof(req_u.req3); | |
3664 | break; | |
3665 | } | |
3666 | if (optlen < len) | |
1da177e4 | 3667 | return -EINVAL; |
f6fb8f10 | 3668 | if (copy_from_user(&req_u.req, optval, len)) |
1da177e4 | 3669 | return -EFAULT; |
f6fb8f10 | 3670 | return packet_set_ring(sk, &req_u, 0, |
3671 | optname == PACKET_TX_RING); | |
1da177e4 LT |
3672 | } |
3673 | case PACKET_COPY_THRESH: | |
3674 | { | |
3675 | int val; | |
3676 | ||
40d4e3df | 3677 | if (optlen != sizeof(val)) |
1da177e4 | 3678 | return -EINVAL; |
40d4e3df | 3679 | if (copy_from_user(&val, optval, sizeof(val))) |
1da177e4 LT |
3680 | return -EFAULT; |
3681 | ||
3682 | pkt_sk(sk)->copy_thresh = val; | |
3683 | return 0; | |
3684 | } | |
bbd6ef87 PM |
3685 | case PACKET_VERSION: |
3686 | { | |
3687 | int val; | |
3688 | ||
3689 | if (optlen != sizeof(val)) | |
3690 | return -EINVAL; | |
bbd6ef87 PM |
3691 | if (copy_from_user(&val, optval, sizeof(val))) |
3692 | return -EFAULT; | |
3693 | switch (val) { | |
3694 | case TPACKET_V1: | |
3695 | case TPACKET_V2: | |
f6fb8f10 | 3696 | case TPACKET_V3: |
84ac7260 | 3697 | break; |
bbd6ef87 PM |
3698 | default: |
3699 | return -EINVAL; | |
3700 | } | |
84ac7260 PP |
3701 | lock_sock(sk); |
3702 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) { | |
3703 | ret = -EBUSY; | |
3704 | } else { | |
3705 | po->tp_version = val; | |
3706 | ret = 0; | |
3707 | } | |
3708 | release_sock(sk); | |
3709 | return ret; | |
bbd6ef87 | 3710 | } |
8913336a PM |
3711 | case PACKET_RESERVE: |
3712 | { | |
3713 | unsigned int val; | |
3714 | ||
3715 | if (optlen != sizeof(val)) | |
3716 | return -EINVAL; | |
8913336a PM |
3717 | if (copy_from_user(&val, optval, sizeof(val))) |
3718 | return -EFAULT; | |
bcc5364b AK |
3719 | if (val > INT_MAX) |
3720 | return -EINVAL; | |
c27927e3 WB |
3721 | lock_sock(sk); |
3722 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) { | |
3723 | ret = -EBUSY; | |
3724 | } else { | |
3725 | po->tp_reserve = val; | |
3726 | ret = 0; | |
3727 | } | |
3728 | release_sock(sk); | |
3729 | return ret; | |
8913336a | 3730 | } |
69e3c75f JB |
3731 | case PACKET_LOSS: |
3732 | { | |
3733 | unsigned int val; | |
3734 | ||
3735 | if (optlen != sizeof(val)) | |
3736 | return -EINVAL; | |
3737 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3738 | return -EBUSY; | |
3739 | if (copy_from_user(&val, optval, sizeof(val))) | |
3740 | return -EFAULT; | |
3741 | po->tp_loss = !!val; | |
3742 | return 0; | |
3743 | } | |
8dc41944 HX |
3744 | case PACKET_AUXDATA: |
3745 | { | |
3746 | int val; | |
3747 | ||
3748 | if (optlen < sizeof(val)) | |
3749 | return -EINVAL; | |
3750 | if (copy_from_user(&val, optval, sizeof(val))) | |
3751 | return -EFAULT; | |
3752 | ||
3753 | po->auxdata = !!val; | |
3754 | return 0; | |
3755 | } | |
80feaacb PWJ |
3756 | case PACKET_ORIGDEV: |
3757 | { | |
3758 | int val; | |
3759 | ||
3760 | if (optlen < sizeof(val)) | |
3761 | return -EINVAL; | |
3762 | if (copy_from_user(&val, optval, sizeof(val))) | |
3763 | return -EFAULT; | |
3764 | ||
3765 | po->origdev = !!val; | |
3766 | return 0; | |
3767 | } | |
bfd5f4a3 SS |
3768 | case PACKET_VNET_HDR: |
3769 | { | |
3770 | int val; | |
3771 | ||
3772 | if (sock->type != SOCK_RAW) | |
3773 | return -EINVAL; | |
3774 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3775 | return -EBUSY; | |
3776 | if (optlen < sizeof(val)) | |
3777 | return -EINVAL; | |
3778 | if (copy_from_user(&val, optval, sizeof(val))) | |
3779 | return -EFAULT; | |
3780 | ||
3781 | po->has_vnet_hdr = !!val; | |
3782 | return 0; | |
3783 | } | |
614f60fa SM |
3784 | case PACKET_TIMESTAMP: |
3785 | { | |
3786 | int val; | |
3787 | ||
3788 | if (optlen != sizeof(val)) | |
3789 | return -EINVAL; | |
3790 | if (copy_from_user(&val, optval, sizeof(val))) | |
3791 | return -EFAULT; | |
3792 | ||
3793 | po->tp_tstamp = val; | |
3794 | return 0; | |
3795 | } | |
dc99f600 DM |
3796 | case PACKET_FANOUT: |
3797 | { | |
3798 | int val; | |
3799 | ||
3800 | if (optlen != sizeof(val)) | |
3801 | return -EINVAL; | |
3802 | if (copy_from_user(&val, optval, sizeof(val))) | |
3803 | return -EFAULT; | |
3804 | ||
3805 | return fanout_add(sk, val & 0xffff, val >> 16); | |
3806 | } | |
47dceb8e WB |
3807 | case PACKET_FANOUT_DATA: |
3808 | { | |
3809 | if (!po->fanout) | |
3810 | return -EINVAL; | |
3811 | ||
3812 | return fanout_set_data(po, optval, optlen); | |
3813 | } | |
5920cd3a PC |
3814 | case PACKET_TX_HAS_OFF: |
3815 | { | |
3816 | unsigned int val; | |
3817 | ||
3818 | if (optlen != sizeof(val)) | |
3819 | return -EINVAL; | |
3820 | if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) | |
3821 | return -EBUSY; | |
3822 | if (copy_from_user(&val, optval, sizeof(val))) | |
3823 | return -EFAULT; | |
3824 | po->tp_tx_has_off = !!val; | |
3825 | return 0; | |
3826 | } | |
d346a3fa DB |
3827 | case PACKET_QDISC_BYPASS: |
3828 | { | |
3829 | int val; | |
3830 | ||
3831 | if (optlen != sizeof(val)) | |
3832 | return -EINVAL; | |
3833 | if (copy_from_user(&val, optval, sizeof(val))) | |
3834 | return -EFAULT; | |
3835 | ||
3836 | po->xmit = val ? packet_direct_xmit : dev_queue_xmit; | |
3837 | return 0; | |
3838 | } | |
1da177e4 LT |
3839 | default: |
3840 | return -ENOPROTOOPT; | |
3841 | } | |
3842 | } | |
3843 | ||
3844 | static int packet_getsockopt(struct socket *sock, int level, int optname, | |
3845 | char __user *optval, int __user *optlen) | |
3846 | { | |
3847 | int len; | |
c06fff6e | 3848 | int val, lv = sizeof(val); |
1da177e4 LT |
3849 | struct sock *sk = sock->sk; |
3850 | struct packet_sock *po = pkt_sk(sk); | |
c06fff6e | 3851 | void *data = &val; |
ee80fbf3 | 3852 | union tpacket_stats_u st; |
a9b63918 | 3853 | struct tpacket_rollover_stats rstats; |
1da177e4 LT |
3854 | |
3855 | if (level != SOL_PACKET) | |
3856 | return -ENOPROTOOPT; | |
3857 | ||
8ae55f04 KK |
3858 | if (get_user(len, optlen)) |
3859 | return -EFAULT; | |
1da177e4 LT |
3860 | |
3861 | if (len < 0) | |
3862 | return -EINVAL; | |
1ce4f28b | 3863 | |
69e3c75f | 3864 | switch (optname) { |
1da177e4 | 3865 | case PACKET_STATISTICS: |
1da177e4 | 3866 | spin_lock_bh(&sk->sk_receive_queue.lock); |
ee80fbf3 DB |
3867 | memcpy(&st, &po->stats, sizeof(st)); |
3868 | memset(&po->stats, 0, sizeof(po->stats)); | |
3869 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
3870 | ||
f6fb8f10 | 3871 | if (po->tp_version == TPACKET_V3) { |
c06fff6e | 3872 | lv = sizeof(struct tpacket_stats_v3); |
8bcdeaff | 3873 | st.stats3.tp_packets += st.stats3.tp_drops; |
ee80fbf3 | 3874 | data = &st.stats3; |
f6fb8f10 | 3875 | } else { |
c06fff6e | 3876 | lv = sizeof(struct tpacket_stats); |
8bcdeaff | 3877 | st.stats1.tp_packets += st.stats1.tp_drops; |
ee80fbf3 | 3878 | data = &st.stats1; |
f6fb8f10 | 3879 | } |
ee80fbf3 | 3880 | |
8dc41944 HX |
3881 | break; |
3882 | case PACKET_AUXDATA: | |
8dc41944 | 3883 | val = po->auxdata; |
80feaacb PWJ |
3884 | break; |
3885 | case PACKET_ORIGDEV: | |
80feaacb | 3886 | val = po->origdev; |
bfd5f4a3 SS |
3887 | break; |
3888 | case PACKET_VNET_HDR: | |
bfd5f4a3 | 3889 | val = po->has_vnet_hdr; |
1da177e4 | 3890 | break; |
bbd6ef87 | 3891 | case PACKET_VERSION: |
bbd6ef87 | 3892 | val = po->tp_version; |
bbd6ef87 PM |
3893 | break; |
3894 | case PACKET_HDRLEN: | |
3895 | if (len > sizeof(int)) | |
3896 | len = sizeof(int); | |
fd2c83b3 AP |
3897 | if (len < sizeof(int)) |
3898 | return -EINVAL; | |
bbd6ef87 PM |
3899 | if (copy_from_user(&val, optval, len)) |
3900 | return -EFAULT; | |
3901 | switch (val) { | |
3902 | case TPACKET_V1: | |
3903 | val = sizeof(struct tpacket_hdr); | |
3904 | break; | |
3905 | case TPACKET_V2: | |
3906 | val = sizeof(struct tpacket2_hdr); | |
3907 | break; | |
f6fb8f10 | 3908 | case TPACKET_V3: |
3909 | val = sizeof(struct tpacket3_hdr); | |
3910 | break; | |
bbd6ef87 PM |
3911 | default: |
3912 | return -EINVAL; | |
3913 | } | |
bbd6ef87 | 3914 | break; |
8913336a | 3915 | case PACKET_RESERVE: |
8913336a | 3916 | val = po->tp_reserve; |
8913336a | 3917 | break; |
69e3c75f | 3918 | case PACKET_LOSS: |
69e3c75f | 3919 | val = po->tp_loss; |
69e3c75f | 3920 | break; |
614f60fa | 3921 | case PACKET_TIMESTAMP: |
614f60fa | 3922 | val = po->tp_tstamp; |
614f60fa | 3923 | break; |
dc99f600 | 3924 | case PACKET_FANOUT: |
dc99f600 DM |
3925 | val = (po->fanout ? |
3926 | ((u32)po->fanout->id | | |
77f65ebd WB |
3927 | ((u32)po->fanout->type << 16) | |
3928 | ((u32)po->fanout->flags << 24)) : | |
dc99f600 | 3929 | 0); |
dc99f600 | 3930 | break; |
a9b63918 WB |
3931 | case PACKET_ROLLOVER_STATS: |
3932 | if (!po->rollover) | |
3933 | return -EINVAL; | |
3934 | rstats.tp_all = atomic_long_read(&po->rollover->num); | |
3935 | rstats.tp_huge = atomic_long_read(&po->rollover->num_huge); | |
3936 | rstats.tp_failed = atomic_long_read(&po->rollover->num_failed); | |
3937 | data = &rstats; | |
3938 | lv = sizeof(rstats); | |
3939 | break; | |
5920cd3a PC |
3940 | case PACKET_TX_HAS_OFF: |
3941 | val = po->tp_tx_has_off; | |
3942 | break; | |
d346a3fa DB |
3943 | case PACKET_QDISC_BYPASS: |
3944 | val = packet_use_direct_xmit(po); | |
3945 | break; | |
1da177e4 LT |
3946 | default: |
3947 | return -ENOPROTOOPT; | |
3948 | } | |
3949 | ||
c06fff6e ED |
3950 | if (len > lv) |
3951 | len = lv; | |
8ae55f04 KK |
3952 | if (put_user(len, optlen)) |
3953 | return -EFAULT; | |
8dc41944 HX |
3954 | if (copy_to_user(optval, data, len)) |
3955 | return -EFAULT; | |
8ae55f04 | 3956 | return 0; |
1da177e4 LT |
3957 | } |
3958 | ||
3959 | ||
719c44d3 WB |
3960 | #ifdef CONFIG_COMPAT |
3961 | static int compat_packet_setsockopt(struct socket *sock, int level, int optname, | |
3962 | char __user *optval, unsigned int optlen) | |
3963 | { | |
3964 | struct packet_sock *po = pkt_sk(sock->sk); | |
3965 | ||
3966 | if (level != SOL_PACKET) | |
3967 | return -ENOPROTOOPT; | |
3968 | ||
3969 | if (optname == PACKET_FANOUT_DATA && | |
3970 | po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) { | |
3971 | optval = (char __user *)get_compat_bpf_fprog(optval); | |
3972 | if (!optval) | |
3973 | return -EFAULT; | |
3974 | optlen = sizeof(struct sock_fprog); | |
3975 | } | |
3976 | ||
3977 | return packet_setsockopt(sock, level, optname, optval, optlen); | |
3978 | } | |
3979 | #endif | |
3980 | ||
351638e7 JP |
3981 | static int packet_notifier(struct notifier_block *this, |
3982 | unsigned long msg, void *ptr) | |
1da177e4 LT |
3983 | { |
3984 | struct sock *sk; | |
351638e7 | 3985 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3986 | struct net *net = dev_net(dev); |
1da177e4 | 3987 | |
808f5114 | 3988 | rcu_read_lock(); |
b67bfe0d | 3989 | sk_for_each_rcu(sk, &net->packet.sklist) { |
1da177e4 LT |
3990 | struct packet_sock *po = pkt_sk(sk); |
3991 | ||
3992 | switch (msg) { | |
3993 | case NETDEV_UNREGISTER: | |
1da177e4 | 3994 | if (po->mclist) |
82f17091 | 3995 | packet_dev_mclist_delete(dev, &po->mclist); |
a2efcfa0 DM |
3996 | /* fallthrough */ |
3997 | ||
1da177e4 LT |
3998 | case NETDEV_DOWN: |
3999 | if (dev->ifindex == po->ifindex) { | |
4000 | spin_lock(&po->bind_lock); | |
4001 | if (po->running) { | |
ce06b03e | 4002 | __unregister_prot_hook(sk, false); |
1da177e4 LT |
4003 | sk->sk_err = ENETDOWN; |
4004 | if (!sock_flag(sk, SOCK_DEAD)) | |
4005 | sk->sk_error_report(sk); | |
4006 | } | |
4007 | if (msg == NETDEV_UNREGISTER) { | |
66e56cd4 | 4008 | packet_cached_dev_reset(po); |
1da177e4 | 4009 | po->ifindex = -1; |
160ff18a BG |
4010 | if (po->prot_hook.dev) |
4011 | dev_put(po->prot_hook.dev); | |
1da177e4 LT |
4012 | po->prot_hook.dev = NULL; |
4013 | } | |
4014 | spin_unlock(&po->bind_lock); | |
4015 | } | |
4016 | break; | |
4017 | case NETDEV_UP: | |
808f5114 | 4018 | if (dev->ifindex == po->ifindex) { |
4019 | spin_lock(&po->bind_lock); | |
ce06b03e DM |
4020 | if (po->num) |
4021 | register_prot_hook(sk); | |
808f5114 | 4022 | spin_unlock(&po->bind_lock); |
1da177e4 | 4023 | } |
1da177e4 LT |
4024 | break; |
4025 | } | |
4026 | } | |
808f5114 | 4027 | rcu_read_unlock(); |
1da177e4 LT |
4028 | return NOTIFY_DONE; |
4029 | } | |
4030 | ||
4031 | ||
4032 | static int packet_ioctl(struct socket *sock, unsigned int cmd, | |
4033 | unsigned long arg) | |
4034 | { | |
4035 | struct sock *sk = sock->sk; | |
4036 | ||
69e3c75f | 4037 | switch (cmd) { |
40d4e3df ED |
4038 | case SIOCOUTQ: |
4039 | { | |
4040 | int amount = sk_wmem_alloc_get(sk); | |
31e6d363 | 4041 | |
40d4e3df ED |
4042 | return put_user(amount, (int __user *)arg); |
4043 | } | |
4044 | case SIOCINQ: | |
4045 | { | |
4046 | struct sk_buff *skb; | |
4047 | int amount = 0; | |
4048 | ||
4049 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
4050 | skb = skb_peek(&sk->sk_receive_queue); | |
4051 | if (skb) | |
4052 | amount = skb->len; | |
4053 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
4054 | return put_user(amount, (int __user *)arg); | |
4055 | } | |
4056 | case SIOCGSTAMP: | |
4057 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
4058 | case SIOCGSTAMPNS: | |
4059 | return sock_get_timestampns(sk, (struct timespec __user *)arg); | |
1ce4f28b | 4060 | |
1da177e4 | 4061 | #ifdef CONFIG_INET |
40d4e3df ED |
4062 | case SIOCADDRT: |
4063 | case SIOCDELRT: | |
4064 | case SIOCDARP: | |
4065 | case SIOCGARP: | |
4066 | case SIOCSARP: | |
4067 | case SIOCGIFADDR: | |
4068 | case SIOCSIFADDR: | |
4069 | case SIOCGIFBRDADDR: | |
4070 | case SIOCSIFBRDADDR: | |
4071 | case SIOCGIFNETMASK: | |
4072 | case SIOCSIFNETMASK: | |
4073 | case SIOCGIFDSTADDR: | |
4074 | case SIOCSIFDSTADDR: | |
4075 | case SIOCSIFFLAGS: | |
40d4e3df | 4076 | return inet_dgram_ops.ioctl(sock, cmd, arg); |
1da177e4 LT |
4077 | #endif |
4078 | ||
40d4e3df ED |
4079 | default: |
4080 | return -ENOIOCTLCMD; | |
1da177e4 LT |
4081 | } |
4082 | return 0; | |
4083 | } | |
4084 | ||
40d4e3df | 4085 | static unsigned int packet_poll(struct file *file, struct socket *sock, |
1da177e4 LT |
4086 | poll_table *wait) |
4087 | { | |
4088 | struct sock *sk = sock->sk; | |
4089 | struct packet_sock *po = pkt_sk(sk); | |
4090 | unsigned int mask = datagram_poll(file, sock, wait); | |
4091 | ||
4092 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
69e3c75f | 4093 | if (po->rx_ring.pg_vec) { |
f6fb8f10 | 4094 | if (!packet_previous_rx_frame(po, &po->rx_ring, |
4095 | TP_STATUS_KERNEL)) | |
1da177e4 LT |
4096 | mask |= POLLIN | POLLRDNORM; |
4097 | } | |
2ccdbaa6 | 4098 | if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL) |
54d7c01d | 4099 | po->pressure = 0; |
1da177e4 | 4100 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
69e3c75f JB |
4101 | spin_lock_bh(&sk->sk_write_queue.lock); |
4102 | if (po->tx_ring.pg_vec) { | |
4103 | if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) | |
4104 | mask |= POLLOUT | POLLWRNORM; | |
4105 | } | |
4106 | spin_unlock_bh(&sk->sk_write_queue.lock); | |
1da177e4 LT |
4107 | return mask; |
4108 | } | |
4109 | ||
4110 | ||
4111 | /* Dirty? Well, I still did not learn better way to account | |
4112 | * for user mmaps. | |
4113 | */ | |
4114 | ||
4115 | static void packet_mm_open(struct vm_area_struct *vma) | |
4116 | { | |
4117 | struct file *file = vma->vm_file; | |
40d4e3df | 4118 | struct socket *sock = file->private_data; |
1da177e4 | 4119 | struct sock *sk = sock->sk; |
1ce4f28b | 4120 | |
1da177e4 LT |
4121 | if (sk) |
4122 | atomic_inc(&pkt_sk(sk)->mapped); | |
4123 | } | |
4124 | ||
4125 | static void packet_mm_close(struct vm_area_struct *vma) | |
4126 | { | |
4127 | struct file *file = vma->vm_file; | |
40d4e3df | 4128 | struct socket *sock = file->private_data; |
1da177e4 | 4129 | struct sock *sk = sock->sk; |
1ce4f28b | 4130 | |
1da177e4 LT |
4131 | if (sk) |
4132 | atomic_dec(&pkt_sk(sk)->mapped); | |
4133 | } | |
4134 | ||
f0f37e2f | 4135 | static const struct vm_operations_struct packet_mmap_ops = { |
40d4e3df ED |
4136 | .open = packet_mm_open, |
4137 | .close = packet_mm_close, | |
1da177e4 LT |
4138 | }; |
4139 | ||
0e3125c7 NH |
4140 | static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
4141 | unsigned int len) | |
1da177e4 LT |
4142 | { |
4143 | int i; | |
4144 | ||
4ebf0ae2 | 4145 | for (i = 0; i < len; i++) { |
0e3125c7 | 4146 | if (likely(pg_vec[i].buffer)) { |
c56b4d90 | 4147 | if (is_vmalloc_addr(pg_vec[i].buffer)) |
0e3125c7 NH |
4148 | vfree(pg_vec[i].buffer); |
4149 | else | |
4150 | free_pages((unsigned long)pg_vec[i].buffer, | |
4151 | order); | |
4152 | pg_vec[i].buffer = NULL; | |
4153 | } | |
1da177e4 LT |
4154 | } |
4155 | kfree(pg_vec); | |
4156 | } | |
4157 | ||
eea49cc9 | 4158 | static char *alloc_one_pg_vec_page(unsigned long order) |
4ebf0ae2 | 4159 | { |
f0d4eb29 | 4160 | char *buffer; |
0e3125c7 NH |
4161 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | |
4162 | __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; | |
4163 | ||
4164 | buffer = (char *) __get_free_pages(gfp_flags, order); | |
0e3125c7 NH |
4165 | if (buffer) |
4166 | return buffer; | |
4167 | ||
f0d4eb29 | 4168 | /* __get_free_pages failed, fall back to vmalloc */ |
bbce5a59 | 4169 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
0e3125c7 NH |
4170 | if (buffer) |
4171 | return buffer; | |
4172 | ||
f0d4eb29 | 4173 | /* vmalloc failed, lets dig into swap here */ |
0e3125c7 | 4174 | gfp_flags &= ~__GFP_NORETRY; |
f0d4eb29 | 4175 | buffer = (char *) __get_free_pages(gfp_flags, order); |
0e3125c7 NH |
4176 | if (buffer) |
4177 | return buffer; | |
4178 | ||
f0d4eb29 | 4179 | /* complete and utter failure */ |
0e3125c7 | 4180 | return NULL; |
4ebf0ae2 DM |
4181 | } |
4182 | ||
0e3125c7 | 4183 | static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
4ebf0ae2 DM |
4184 | { |
4185 | unsigned int block_nr = req->tp_block_nr; | |
0e3125c7 | 4186 | struct pgv *pg_vec; |
4ebf0ae2 DM |
4187 | int i; |
4188 | ||
0e3125c7 | 4189 | pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
4ebf0ae2 DM |
4190 | if (unlikely(!pg_vec)) |
4191 | goto out; | |
4192 | ||
4193 | for (i = 0; i < block_nr; i++) { | |
c56b4d90 | 4194 | pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
0e3125c7 | 4195 | if (unlikely(!pg_vec[i].buffer)) |
4ebf0ae2 DM |
4196 | goto out_free_pgvec; |
4197 | } | |
4198 | ||
4199 | out: | |
4200 | return pg_vec; | |
4201 | ||
4202 | out_free_pgvec: | |
4203 | free_pg_vec(pg_vec, order, block_nr); | |
4204 | pg_vec = NULL; | |
4205 | goto out; | |
4206 | } | |
1da177e4 | 4207 | |
f6fb8f10 | 4208 | static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
69e3c75f | 4209 | int closing, int tx_ring) |
1da177e4 | 4210 | { |
0e3125c7 | 4211 | struct pgv *pg_vec = NULL; |
1da177e4 | 4212 | struct packet_sock *po = pkt_sk(sk); |
0e11c91e | 4213 | int was_running, order = 0; |
69e3c75f JB |
4214 | struct packet_ring_buffer *rb; |
4215 | struct sk_buff_head *rb_queue; | |
0e11c91e | 4216 | __be16 num; |
f6fb8f10 | 4217 | int err = -EINVAL; |
4218 | /* Added to avoid minimal code churn */ | |
4219 | struct tpacket_req *req = &req_u->req; | |
4220 | ||
84ac7260 | 4221 | lock_sock(sk); |
1ce4f28b | 4222 | |
69e3c75f JB |
4223 | rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
4224 | rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; | |
1da177e4 | 4225 | |
69e3c75f JB |
4226 | err = -EBUSY; |
4227 | if (!closing) { | |
4228 | if (atomic_read(&po->mapped)) | |
4229 | goto out; | |
b0138408 | 4230 | if (packet_read_pending(rb)) |
69e3c75f JB |
4231 | goto out; |
4232 | } | |
1da177e4 | 4233 | |
69e3c75f JB |
4234 | if (req->tp_block_nr) { |
4235 | /* Sanity tests and some calculations */ | |
4236 | err = -EBUSY; | |
4237 | if (unlikely(rb->pg_vec)) | |
4238 | goto out; | |
1da177e4 | 4239 | |
bbd6ef87 PM |
4240 | switch (po->tp_version) { |
4241 | case TPACKET_V1: | |
4242 | po->tp_hdrlen = TPACKET_HDRLEN; | |
4243 | break; | |
4244 | case TPACKET_V2: | |
4245 | po->tp_hdrlen = TPACKET2_HDRLEN; | |
4246 | break; | |
f6fb8f10 | 4247 | case TPACKET_V3: |
4248 | po->tp_hdrlen = TPACKET3_HDRLEN; | |
4249 | break; | |
bbd6ef87 PM |
4250 | } |
4251 | ||
69e3c75f | 4252 | err = -EINVAL; |
4ebf0ae2 | 4253 | if (unlikely((int)req->tp_block_size <= 0)) |
69e3c75f | 4254 | goto out; |
90836b67 | 4255 | if (unlikely(!PAGE_ALIGNED(req->tp_block_size))) |
69e3c75f | 4256 | goto out; |
dc808110 | 4257 | if (po->tp_version >= TPACKET_V3 && |
2b6867c2 AK |
4258 | req->tp_block_size <= |
4259 | BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv)) | |
dc808110 | 4260 | goto out; |
8913336a | 4261 | if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
69e3c75f JB |
4262 | po->tp_reserve)) |
4263 | goto out; | |
4ebf0ae2 | 4264 | if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
69e3c75f | 4265 | goto out; |
1da177e4 | 4266 | |
4194b491 TK |
4267 | rb->frames_per_block = req->tp_block_size / req->tp_frame_size; |
4268 | if (unlikely(rb->frames_per_block == 0)) | |
69e3c75f | 4269 | goto out; |
8f8d28e4 AK |
4270 | if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr)) |
4271 | goto out; | |
69e3c75f JB |
4272 | if (unlikely((rb->frames_per_block * req->tp_block_nr) != |
4273 | req->tp_frame_nr)) | |
4274 | goto out; | |
1da177e4 LT |
4275 | |
4276 | err = -ENOMEM; | |
4ebf0ae2 DM |
4277 | order = get_order(req->tp_block_size); |
4278 | pg_vec = alloc_pg_vec(req, order); | |
4279 | if (unlikely(!pg_vec)) | |
1da177e4 | 4280 | goto out; |
f6fb8f10 | 4281 | switch (po->tp_version) { |
4282 | case TPACKET_V3: | |
7f953ab2 SV |
4283 | /* Block transmit is not supported yet */ |
4284 | if (!tx_ring) { | |
e8e85cc5 | 4285 | init_prb_bdqc(po, rb, pg_vec, req_u); |
7f953ab2 SV |
4286 | } else { |
4287 | struct tpacket_req3 *req3 = &req_u->req3; | |
4288 | ||
4289 | if (req3->tp_retire_blk_tov || | |
4290 | req3->tp_sizeof_priv || | |
4291 | req3->tp_feature_req_word) { | |
4292 | err = -EINVAL; | |
4293 | goto out; | |
4294 | } | |
4295 | } | |
d7cf0c34 | 4296 | break; |
f6fb8f10 | 4297 | default: |
4298 | break; | |
4299 | } | |
69e3c75f JB |
4300 | } |
4301 | /* Done */ | |
4302 | else { | |
4303 | err = -EINVAL; | |
4ebf0ae2 | 4304 | if (unlikely(req->tp_frame_nr)) |
69e3c75f | 4305 | goto out; |
1da177e4 LT |
4306 | } |
4307 | ||
1da177e4 LT |
4308 | |
4309 | /* Detach socket from network */ | |
4310 | spin_lock(&po->bind_lock); | |
4311 | was_running = po->running; | |
4312 | num = po->num; | |
4313 | if (was_running) { | |
1da177e4 | 4314 | po->num = 0; |
ce06b03e | 4315 | __unregister_prot_hook(sk, false); |
1da177e4 LT |
4316 | } |
4317 | spin_unlock(&po->bind_lock); | |
1ce4f28b | 4318 | |
1da177e4 LT |
4319 | synchronize_net(); |
4320 | ||
4321 | err = -EBUSY; | |
905db440 | 4322 | mutex_lock(&po->pg_vec_lock); |
1da177e4 LT |
4323 | if (closing || atomic_read(&po->mapped) == 0) { |
4324 | err = 0; | |
69e3c75f | 4325 | spin_lock_bh(&rb_queue->lock); |
c053fd96 | 4326 | swap(rb->pg_vec, pg_vec); |
69e3c75f JB |
4327 | rb->frame_max = (req->tp_frame_nr - 1); |
4328 | rb->head = 0; | |
4329 | rb->frame_size = req->tp_frame_size; | |
4330 | spin_unlock_bh(&rb_queue->lock); | |
4331 | ||
c053fd96 CG |
4332 | swap(rb->pg_vec_order, order); |
4333 | swap(rb->pg_vec_len, req->tp_block_nr); | |
69e3c75f JB |
4334 | |
4335 | rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; | |
4336 | po->prot_hook.func = (po->rx_ring.pg_vec) ? | |
4337 | tpacket_rcv : packet_rcv; | |
4338 | skb_queue_purge(rb_queue); | |
1da177e4 | 4339 | if (atomic_read(&po->mapped)) |
40d4e3df ED |
4340 | pr_err("packet_mmap: vma is busy: %d\n", |
4341 | atomic_read(&po->mapped)); | |
1da177e4 | 4342 | } |
905db440 | 4343 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
4344 | |
4345 | spin_lock(&po->bind_lock); | |
ce06b03e | 4346 | if (was_running) { |
1da177e4 | 4347 | po->num = num; |
ce06b03e | 4348 | register_prot_hook(sk); |
1da177e4 LT |
4349 | } |
4350 | spin_unlock(&po->bind_lock); | |
c800aaf8 | 4351 | if (pg_vec && (po->tp_version > TPACKET_V2)) { |
f6fb8f10 | 4352 | /* Because we don't support block-based V3 on tx-ring */ |
4353 | if (!tx_ring) | |
73d0fcf2 | 4354 | prb_shutdown_retire_blk_timer(po, rb_queue); |
f6fb8f10 | 4355 | } |
1da177e4 | 4356 | |
1da177e4 LT |
4357 | if (pg_vec) |
4358 | free_pg_vec(pg_vec, order, req->tp_block_nr); | |
4359 | out: | |
84ac7260 | 4360 | release_sock(sk); |
1da177e4 LT |
4361 | return err; |
4362 | } | |
4363 | ||
69e3c75f JB |
4364 | static int packet_mmap(struct file *file, struct socket *sock, |
4365 | struct vm_area_struct *vma) | |
1da177e4 LT |
4366 | { |
4367 | struct sock *sk = sock->sk; | |
4368 | struct packet_sock *po = pkt_sk(sk); | |
69e3c75f JB |
4369 | unsigned long size, expected_size; |
4370 | struct packet_ring_buffer *rb; | |
1da177e4 LT |
4371 | unsigned long start; |
4372 | int err = -EINVAL; | |
4373 | int i; | |
4374 | ||
4375 | if (vma->vm_pgoff) | |
4376 | return -EINVAL; | |
4377 | ||
905db440 | 4378 | mutex_lock(&po->pg_vec_lock); |
69e3c75f JB |
4379 | |
4380 | expected_size = 0; | |
4381 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { | |
4382 | if (rb->pg_vec) { | |
4383 | expected_size += rb->pg_vec_len | |
4384 | * rb->pg_vec_pages | |
4385 | * PAGE_SIZE; | |
4386 | } | |
4387 | } | |
4388 | ||
4389 | if (expected_size == 0) | |
1da177e4 | 4390 | goto out; |
69e3c75f JB |
4391 | |
4392 | size = vma->vm_end - vma->vm_start; | |
4393 | if (size != expected_size) | |
1da177e4 LT |
4394 | goto out; |
4395 | ||
1da177e4 | 4396 | start = vma->vm_start; |
69e3c75f JB |
4397 | for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
4398 | if (rb->pg_vec == NULL) | |
4399 | continue; | |
4400 | ||
4401 | for (i = 0; i < rb->pg_vec_len; i++) { | |
0e3125c7 NH |
4402 | struct page *page; |
4403 | void *kaddr = rb->pg_vec[i].buffer; | |
69e3c75f JB |
4404 | int pg_num; |
4405 | ||
c56b4d90 CG |
4406 | for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
4407 | page = pgv_to_page(kaddr); | |
69e3c75f JB |
4408 | err = vm_insert_page(vma, start, page); |
4409 | if (unlikely(err)) | |
4410 | goto out; | |
4411 | start += PAGE_SIZE; | |
0e3125c7 | 4412 | kaddr += PAGE_SIZE; |
69e3c75f | 4413 | } |
4ebf0ae2 | 4414 | } |
1da177e4 | 4415 | } |
69e3c75f | 4416 | |
4ebf0ae2 | 4417 | atomic_inc(&po->mapped); |
1da177e4 LT |
4418 | vma->vm_ops = &packet_mmap_ops; |
4419 | err = 0; | |
4420 | ||
4421 | out: | |
905db440 | 4422 | mutex_unlock(&po->pg_vec_lock); |
1da177e4 LT |
4423 | return err; |
4424 | } | |
1da177e4 | 4425 | |
90ddc4f0 | 4426 | static const struct proto_ops packet_ops_spkt = { |
1da177e4 LT |
4427 | .family = PF_PACKET, |
4428 | .owner = THIS_MODULE, | |
4429 | .release = packet_release, | |
4430 | .bind = packet_bind_spkt, | |
4431 | .connect = sock_no_connect, | |
4432 | .socketpair = sock_no_socketpair, | |
4433 | .accept = sock_no_accept, | |
4434 | .getname = packet_getname_spkt, | |
4435 | .poll = datagram_poll, | |
4436 | .ioctl = packet_ioctl, | |
4437 | .listen = sock_no_listen, | |
4438 | .shutdown = sock_no_shutdown, | |
4439 | .setsockopt = sock_no_setsockopt, | |
4440 | .getsockopt = sock_no_getsockopt, | |
4441 | .sendmsg = packet_sendmsg_spkt, | |
4442 | .recvmsg = packet_recvmsg, | |
4443 | .mmap = sock_no_mmap, | |
4444 | .sendpage = sock_no_sendpage, | |
4445 | }; | |
1da177e4 | 4446 | |
90ddc4f0 | 4447 | static const struct proto_ops packet_ops = { |
1da177e4 LT |
4448 | .family = PF_PACKET, |
4449 | .owner = THIS_MODULE, | |
4450 | .release = packet_release, | |
4451 | .bind = packet_bind, | |
4452 | .connect = sock_no_connect, | |
4453 | .socketpair = sock_no_socketpair, | |
4454 | .accept = sock_no_accept, | |
1ce4f28b | 4455 | .getname = packet_getname, |
1da177e4 LT |
4456 | .poll = packet_poll, |
4457 | .ioctl = packet_ioctl, | |
4458 | .listen = sock_no_listen, | |
4459 | .shutdown = sock_no_shutdown, | |
4460 | .setsockopt = packet_setsockopt, | |
4461 | .getsockopt = packet_getsockopt, | |
719c44d3 WB |
4462 | #ifdef CONFIG_COMPAT |
4463 | .compat_setsockopt = compat_packet_setsockopt, | |
4464 | #endif | |
1da177e4 LT |
4465 | .sendmsg = packet_sendmsg, |
4466 | .recvmsg = packet_recvmsg, | |
4467 | .mmap = packet_mmap, | |
4468 | .sendpage = sock_no_sendpage, | |
4469 | }; | |
4470 | ||
ec1b4cf7 | 4471 | static const struct net_proto_family packet_family_ops = { |
1da177e4 LT |
4472 | .family = PF_PACKET, |
4473 | .create = packet_create, | |
4474 | .owner = THIS_MODULE, | |
4475 | }; | |
4476 | ||
4477 | static struct notifier_block packet_netdev_notifier = { | |
40d4e3df | 4478 | .notifier_call = packet_notifier, |
1da177e4 LT |
4479 | }; |
4480 | ||
4481 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
4482 | |
4483 | static void *packet_seq_start(struct seq_file *seq, loff_t *pos) | |
808f5114 | 4484 | __acquires(RCU) |
1da177e4 | 4485 | { |
e372c414 | 4486 | struct net *net = seq_file_net(seq); |
808f5114 | 4487 | |
4488 | rcu_read_lock(); | |
4489 | return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); | |
1da177e4 LT |
4490 | } |
4491 | ||
4492 | static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
4493 | { | |
1bf40954 | 4494 | struct net *net = seq_file_net(seq); |
808f5114 | 4495 | return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
1da177e4 LT |
4496 | } |
4497 | ||
4498 | static void packet_seq_stop(struct seq_file *seq, void *v) | |
808f5114 | 4499 | __releases(RCU) |
1da177e4 | 4500 | { |
808f5114 | 4501 | rcu_read_unlock(); |
1da177e4 LT |
4502 | } |
4503 | ||
1ce4f28b | 4504 | static int packet_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
4505 | { |
4506 | if (v == SEQ_START_TOKEN) | |
4507 | seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); | |
4508 | else { | |
b7ceabd9 | 4509 | struct sock *s = sk_entry(v); |
1da177e4 LT |
4510 | const struct packet_sock *po = pkt_sk(s); |
4511 | ||
4512 | seq_printf(seq, | |
71338aa7 | 4513 | "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", |
1da177e4 | 4514 | s, |
41c6d650 | 4515 | refcount_read(&s->sk_refcnt), |
1da177e4 LT |
4516 | s->sk_type, |
4517 | ntohs(po->num), | |
4518 | po->ifindex, | |
4519 | po->running, | |
4520 | atomic_read(&s->sk_rmem_alloc), | |
a7cb5a49 | 4521 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)), |
40d4e3df | 4522 | sock_i_ino(s)); |
1da177e4 LT |
4523 | } |
4524 | ||
4525 | return 0; | |
4526 | } | |
4527 | ||
56b3d975 | 4528 | static const struct seq_operations packet_seq_ops = { |
1da177e4 LT |
4529 | .start = packet_seq_start, |
4530 | .next = packet_seq_next, | |
4531 | .stop = packet_seq_stop, | |
4532 | .show = packet_seq_show, | |
4533 | }; | |
4534 | ||
4535 | static int packet_seq_open(struct inode *inode, struct file *file) | |
4536 | { | |
e372c414 DL |
4537 | return seq_open_net(inode, file, &packet_seq_ops, |
4538 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
4539 | } |
4540 | ||
da7071d7 | 4541 | static const struct file_operations packet_seq_fops = { |
1da177e4 LT |
4542 | .owner = THIS_MODULE, |
4543 | .open = packet_seq_open, | |
4544 | .read = seq_read, | |
4545 | .llseek = seq_lseek, | |
e372c414 | 4546 | .release = seq_release_net, |
1da177e4 LT |
4547 | }; |
4548 | ||
4549 | #endif | |
4550 | ||
2c8c1e72 | 4551 | static int __net_init packet_net_init(struct net *net) |
d12d01d6 | 4552 | { |
0fa7fa98 | 4553 | mutex_init(&net->packet.sklist_lock); |
2aaef4e4 | 4554 | INIT_HLIST_HEAD(&net->packet.sklist); |
d12d01d6 | 4555 | |
d4beaa66 | 4556 | if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops)) |
d12d01d6 DL |
4557 | return -ENOMEM; |
4558 | ||
4559 | return 0; | |
4560 | } | |
4561 | ||
2c8c1e72 | 4562 | static void __net_exit packet_net_exit(struct net *net) |
d12d01d6 | 4563 | { |
ece31ffd | 4564 | remove_proc_entry("packet", net->proc_net); |
d12d01d6 DL |
4565 | } |
4566 | ||
4567 | static struct pernet_operations packet_net_ops = { | |
4568 | .init = packet_net_init, | |
4569 | .exit = packet_net_exit, | |
4570 | }; | |
4571 | ||
4572 | ||
1da177e4 LT |
4573 | static void __exit packet_exit(void) |
4574 | { | |
1da177e4 | 4575 | unregister_netdevice_notifier(&packet_netdev_notifier); |
d12d01d6 | 4576 | unregister_pernet_subsys(&packet_net_ops); |
1da177e4 LT |
4577 | sock_unregister(PF_PACKET); |
4578 | proto_unregister(&packet_proto); | |
4579 | } | |
4580 | ||
4581 | static int __init packet_init(void) | |
4582 | { | |
4583 | int rc = proto_register(&packet_proto, 0); | |
4584 | ||
4585 | if (rc != 0) | |
4586 | goto out; | |
4587 | ||
4588 | sock_register(&packet_family_ops); | |
d12d01d6 | 4589 | register_pernet_subsys(&packet_net_ops); |
1da177e4 | 4590 | register_netdevice_notifier(&packet_netdev_notifier); |
1da177e4 LT |
4591 | out: |
4592 | return rc; | |
4593 | } | |
4594 | ||
4595 | module_init(packet_init); | |
4596 | module_exit(packet_exit); | |
4597 | MODULE_LICENSE("GPL"); | |
4598 | MODULE_ALIAS_NETPROTO(PF_PACKET); |