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e1000e: Support RXFCS feature flag.
[deliverable/linux.git] / net / packet / af_packet.c
CommitLineData
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>
76#include <asm/system.h>
77#include <asm/uaccess.h>
78#include <asm/ioctls.h>
79#include <asm/page.h>
a1f8e7f7 80#include <asm/cacheflush.h>
1da177e4
LT		 81#include <asm/io.h>
82#include <linux/proc_fs.h>
83#include <linux/seq_file.h>
84#include <linux/poll.h>
85#include <linux/module.h>
86#include <linux/init.h>
905db440 87#include <linux/mutex.h>
05423b24 88#include <linux/if_vlan.h>
bfd5f4a3 89#include <linux/virtio_net.h>
ed85b565 90#include <linux/errqueue.h>
614f60fa 91#include <linux/net_tstamp.h>
1da177e4
LT		 92
93#ifdef CONFIG_INET
94#include <net/inet_common.h>
95#endif
96
1da177e4
LT		 97/*
98 Assumptions:
99 - if device has no dev->hard_header routine, it adds and removes ll header
100 inside itself. In this case ll header is invisible outside of device,
101 but higher levels still should reserve dev->hard_header_len.
102 Some devices are enough clever to reallocate skb, when header
103 will not fit to reserved space (tunnel), another ones are silly
104 (PPP).
105 - packet socket receives packets with pulled ll header,
106 so that SOCK_RAW should push it back.
107
108On receive:
109-----------
110
111Incoming, dev->hard_header!=NULL
b0e380b1
ACM		 112 mac_header -> ll header
113 data -> data
1da177e4
LT		 114
115Outgoing, dev->hard_header!=NULL
b0e380b1
ACM		 116 mac_header -> ll header
117 data -> ll header
1da177e4
LT		 118
119Incoming, dev->hard_header==NULL
b0e380b1
ACM		 120 mac_header -> UNKNOWN position. It is very likely, that it points to ll
121 header. PPP makes it, that is wrong, because introduce
db0c58f9 122 assymetry between rx and tx paths.
b0e380b1 123 data -> data
1da177e4
LT		 124
125Outgoing, dev->hard_header==NULL
b0e380b1
ACM		 126 mac_header -> data. ll header is still not built!
127 data -> data
1da177e4
LT		 128
129Resume
130 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
131
132
133On transmit:
134------------
135
136dev->hard_header != NULL
b0e380b1
ACM		 137 mac_header -> ll header
138 data -> ll header
1da177e4
LT		 139
140dev->hard_header == NULL (ll header is added by device, we cannot control it)
b0e380b1
ACM		 141 mac_header -> data
142 data -> data
1da177e4
LT		 143
144 We should set nh.raw on output to correct posistion,
145 packet classifier depends on it.
146 */
147
1da177e4
LT		 148/* Private packet socket structures. */
149
40d4e3df 150struct packet_mclist {
1da177e4
LT		 151 struct packet_mclist *next;
152 int ifindex;
153 int count;
154 unsigned short type;
155 unsigned short alen;
0fb375fb
EB		 156 unsigned char addr[MAX_ADDR_LEN];
157};
158/* identical to struct packet_mreq except it has
159 * a longer address field.
160 */
40d4e3df 161struct packet_mreq_max {
0fb375fb
EB		 162 int mr_ifindex;
163 unsigned short mr_type;
164 unsigned short mr_alen;
165 unsigned char mr_address[MAX_ADDR_LEN];
1da177e4 166};
a2efcfa0 167
f6fb8f10 168static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
69e3c75f
JB		 169 int closing, int tx_ring);
170
f6fb8f10 171
172#define V3_ALIGNMENT (8)
173
bc59ba39 174#define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
f6fb8f10 175
176#define BLK_PLUS_PRIV(sz_of_priv) \
177 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
178
179/* kbdq - kernel block descriptor queue */
bc59ba39 180struct tpacket_kbdq_core {
f6fb8f10 181 struct pgv *pkbdq;
182 unsigned int feature_req_word;
183 unsigned int hdrlen;
184 unsigned char reset_pending_on_curr_blk;
185 unsigned char delete_blk_timer;
186 unsigned short kactive_blk_num;
187 unsigned short blk_sizeof_priv;
188
189 /* last_kactive_blk_num:
190 * trick to see if user-space has caught up
191 * in order to avoid refreshing timer when every single pkt arrives.
192 */
193 unsigned short last_kactive_blk_num;
194
195 char *pkblk_start;
196 char *pkblk_end;
197 int kblk_size;
198 unsigned int knum_blocks;
199 uint64_t knxt_seq_num;
200 char *prev;
201 char *nxt_offset;
202 struct sk_buff *skb;
203
204 atomic_t blk_fill_in_prog;
205
206 /* Default is set to 8ms */
207#define DEFAULT_PRB_RETIRE_TOV (8)
208
209 unsigned short retire_blk_tov;
210 unsigned short version;
211 unsigned long tov_in_jiffies;
212
213 /* timer to retire an outstanding block */
214 struct timer_list retire_blk_timer;
215};
216
217#define PGV_FROM_VMALLOC 1
0e3125c7
NH		 218struct pgv {
219 char *buffer;
0e3125c7
NH		 220};
221
69e3c75f 222struct packet_ring_buffer {
0e3125c7 223 struct pgv *pg_vec;
69e3c75f
JB		 224 unsigned int head;
225 unsigned int frames_per_block;
226 unsigned int frame_size;
227 unsigned int frame_max;
228
229 unsigned int pg_vec_order;
230 unsigned int pg_vec_pages;
231 unsigned int pg_vec_len;
232
bc59ba39 233 struct tpacket_kbdq_core prb_bdqc;
69e3c75f
JB		 234 atomic_t pending;
235};
236
f6fb8f10 237#define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
238#define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
239#define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
240#define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
241#define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
242#define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
243#define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
244
69e3c75f
JB		 245struct packet_sock;
246static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
1da177e4 247
f6fb8f10 248static void *packet_previous_frame(struct packet_sock *po,
249 struct packet_ring_buffer *rb,
250 int status);
251static void packet_increment_head(struct packet_ring_buffer *buff);
bc59ba39 252static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
253 struct tpacket_block_desc *);
254static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
f6fb8f10 255 struct packet_sock *);
bc59ba39 256static void prb_retire_current_block(struct tpacket_kbdq_core *,
f6fb8f10 257 struct packet_sock *, unsigned int status);
bc59ba39 258static int prb_queue_frozen(struct tpacket_kbdq_core *);
259static void prb_open_block(struct tpacket_kbdq_core *,
260 struct tpacket_block_desc *);
f6fb8f10 261static void prb_retire_rx_blk_timer_expired(unsigned long);
bc59ba39 262static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
263static void prb_init_blk_timer(struct packet_sock *,
264 struct tpacket_kbdq_core *,
265 void (*func) (unsigned long));
266static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
267static void prb_clear_rxhash(struct tpacket_kbdq_core *,
268 struct tpacket3_hdr *);
269static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
270 struct tpacket3_hdr *);
1da177e4
LT		 271static void packet_flush_mclist(struct sock *sk);
272
dc99f600 273struct packet_fanout;
1da177e4
LT		 274struct packet_sock {
275 /* struct sock has to be the first member of packet_sock */
276 struct sock sk;
dc99f600 277 struct packet_fanout *fanout;
1da177e4 278 struct tpacket_stats stats;
f6fb8f10 279 union tpacket_stats_u stats_u;
69e3c75f
JB		 280 struct packet_ring_buffer rx_ring;
281 struct packet_ring_buffer tx_ring;
1da177e4 282 int copy_thresh;
1da177e4 283 spinlock_t bind_lock;
905db440 284 struct mutex pg_vec_lock;
8dc41944 285 unsigned int running:1, /* prot_hook is attached*/
80feaacb 286 auxdata:1,
bfd5f4a3
SS		 287 origdev:1,
288 has_vnet_hdr:1;
1da177e4 289 int ifindex; /* bound device */
0e11c91e 290 __be16 num;
1da177e4 291 struct packet_mclist *mclist;
1da177e4 292 atomic_t mapped;
bbd6ef87
PM		 293 enum tpacket_versions tp_version;
294 unsigned int tp_hdrlen;
8913336a 295 unsigned int tp_reserve;
69e3c75f 296 unsigned int tp_loss:1;
614f60fa 297 unsigned int tp_tstamp;
94b05952 298 struct packet_type prot_hook ____cacheline_aligned_in_smp;
1da177e4
LT		 299};
300
dc99f600
DM		 301#define PACKET_FANOUT_MAX 256
302
303struct packet_fanout {
304#ifdef CONFIG_NET_NS
305 struct net *net;
306#endif
307 unsigned int num_members;
308 u16 id;
309 u8 type;
7736d33f 310 u8 defrag;
dc99f600
DM		 311 atomic_t rr_cur;
312 struct list_head list;
313 struct sock *arr[PACKET_FANOUT_MAX];
314 spinlock_t lock;
315 atomic_t sk_ref;
316 struct packet_type prot_hook ____cacheline_aligned_in_smp;
317};
318
ffbc6111
HX		 319struct packet_skb_cb {
320 unsigned int origlen;
321 union {
322 struct sockaddr_pkt pkt;
323 struct sockaddr_ll ll;
324 } sa;
325};
326
327#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
8dc41944 328
bc59ba39 329#define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
f6fb8f10 330#define GET_PBLOCK_DESC(x, bid) \
bc59ba39 331 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
f6fb8f10 332#define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
bc59ba39 333 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
f6fb8f10 334#define GET_NEXT_PRB_BLK_NUM(x) \
335 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
336 ((x)->kactive_blk_num+1) : 0)
337
eea49cc9 338static struct packet_sock *pkt_sk(struct sock *sk)
ce06b03e
DM		 339{
340 return (struct packet_sock *)sk;
341}
342
dc99f600
DM		 343static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
344static void __fanout_link(struct sock *sk, struct packet_sock *po);
345
ce06b03e
DM		 346/* register_prot_hook must be invoked with the po->bind_lock held,
347 * or from a context in which asynchronous accesses to the packet
348 * socket is not possible (packet_create()).
349 */
350static void register_prot_hook(struct sock *sk)
351{
352 struct packet_sock *po = pkt_sk(sk);
353 if (!po->running) {
dc99f600
DM		 354 if (po->fanout)
355 __fanout_link(sk, po);
356 else
357 dev_add_pack(&po->prot_hook);
ce06b03e
DM		 358 sock_hold(sk);
359 po->running = 1;
360 }
361}
362
363/* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
364 * held. If the sync parameter is true, we will temporarily drop
365 * the po->bind_lock and do a synchronize_net to make sure no
366 * asynchronous packet processing paths still refer to the elements
367 * of po->prot_hook. If the sync parameter is false, it is the
368 * callers responsibility to take care of this.
369 */
370static void __unregister_prot_hook(struct sock *sk, bool sync)
371{
372 struct packet_sock *po = pkt_sk(sk);
373
374 po->running = 0;
dc99f600
DM		 375 if (po->fanout)
376 __fanout_unlink(sk, po);
377 else
378 __dev_remove_pack(&po->prot_hook);
ce06b03e
DM		 379 __sock_put(sk);
380
381 if (sync) {
382 spin_unlock(&po->bind_lock);
383 synchronize_net();
384 spin_lock(&po->bind_lock);
385 }
386}
387
388static void unregister_prot_hook(struct sock *sk, bool sync)
389{
390 struct packet_sock *po = pkt_sk(sk);
391
392 if (po->running)
393 __unregister_prot_hook(sk, sync);
394}
395
f6dafa95 396static inline __pure struct page *pgv_to_page(void *addr)
0af55bb5
CG		 397{
398 if (is_vmalloc_addr(addr))
399 return vmalloc_to_page(addr);
400 return virt_to_page(addr);
401}
402
69e3c75f 403static void __packet_set_status(struct packet_sock *po, void *frame, int status)
1da177e4 404{
bbd6ef87
PM		 405 union {
406 struct tpacket_hdr *h1;
407 struct tpacket2_hdr *h2;
408 void *raw;
409 } h;
1da177e4 410
69e3c75f 411 h.raw = frame;
bbd6ef87
PM		 412 switch (po->tp_version) {
413 case TPACKET_V1:
69e3c75f 414 h.h1->tp_status = status;
0af55bb5 415 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
bbd6ef87
PM		 416 break;
417 case TPACKET_V2:
69e3c75f 418 h.h2->tp_status = status;
0af55bb5 419 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
bbd6ef87 420 break;
f6fb8f10 421 case TPACKET_V3:
69e3c75f 422 default:
f6fb8f10 423 WARN(1, "TPACKET version not supported.\n");
69e3c75f 424 BUG();
bbd6ef87 425 }
69e3c75f
JB		 426
427 smp_wmb();
bbd6ef87
PM		 428}
429
69e3c75f 430static int __packet_get_status(struct packet_sock *po, void *frame)
bbd6ef87
PM		 431{
432 union {
433 struct tpacket_hdr *h1;
434 struct tpacket2_hdr *h2;
435 void *raw;
436 } h;
437
69e3c75f
JB		 438 smp_rmb();
439
bbd6ef87
PM		 440 h.raw = frame;
441 switch (po->tp_version) {
442 case TPACKET_V1:
0af55bb5 443 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
69e3c75f 444 return h.h1->tp_status;
bbd6ef87 445 case TPACKET_V2:
0af55bb5 446 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
69e3c75f 447 return h.h2->tp_status;
f6fb8f10 448 case TPACKET_V3:
69e3c75f 449 default:
f6fb8f10 450 WARN(1, "TPACKET version not supported.\n");
69e3c75f
JB		 451 BUG();
452 return 0;
bbd6ef87 453 }
1da177e4 454}
69e3c75f
JB		 455
456static void *packet_lookup_frame(struct packet_sock *po,
457 struct packet_ring_buffer *rb,
458 unsigned int position,
459 int status)
460{
461 unsigned int pg_vec_pos, frame_offset;
462 union {
463 struct tpacket_hdr *h1;
464 struct tpacket2_hdr *h2;
465 void *raw;
466 } h;
467
468 pg_vec_pos = position / rb->frames_per_block;
469 frame_offset = position % rb->frames_per_block;
470
0e3125c7
NH		 471 h.raw = rb->pg_vec[pg_vec_pos].buffer +
472 (frame_offset * rb->frame_size);
69e3c75f
JB		 473
474 if (status != __packet_get_status(po, h.raw))
475 return NULL;
476
477 return h.raw;
478}
479
eea49cc9 480static void *packet_current_frame(struct packet_sock *po,
69e3c75f
JB		 481 struct packet_ring_buffer *rb,
482 int status)
483{
484 return packet_lookup_frame(po, rb, rb->head, status);
485}
486
bc59ba39 487static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
f6fb8f10 488{
489 del_timer_sync(&pkc->retire_blk_timer);
490}
491
492static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
493 int tx_ring,
494 struct sk_buff_head *rb_queue)
495{
bc59ba39 496 struct tpacket_kbdq_core *pkc;
f6fb8f10 497
498 pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
499
500 spin_lock(&rb_queue->lock);
501 pkc->delete_blk_timer = 1;
502 spin_unlock(&rb_queue->lock);
503
504 prb_del_retire_blk_timer(pkc);
505}
506
507static void prb_init_blk_timer(struct packet_sock *po,
bc59ba39 508 struct tpacket_kbdq_core *pkc,
f6fb8f10 509 void (*func) (unsigned long))
510{
511 init_timer(&pkc->retire_blk_timer);
512 pkc->retire_blk_timer.data = (long)po;
513 pkc->retire_blk_timer.function = func;
514 pkc->retire_blk_timer.expires = jiffies;
515}
516
517static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring)
518{
bc59ba39 519 struct tpacket_kbdq_core *pkc;
f6fb8f10 520
521 if (tx_ring)
522 BUG();
523
524 pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
525 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
526}
527
528static int prb_calc_retire_blk_tmo(struct packet_sock *po,
529 int blk_size_in_bytes)
530{
531 struct net_device *dev;
532 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
4bc71cb9
JP		 533 struct ethtool_cmd ecmd;
534 int err;
f6fb8f10 535
4bc71cb9
JP		 536 rtnl_lock();
537 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
538 if (unlikely(!dev)) {
539 rtnl_unlock();
f6fb8f10 540 return DEFAULT_PRB_RETIRE_TOV;
4bc71cb9
JP		 541 }
542 err = __ethtool_get_settings(dev, &ecmd);
543 rtnl_unlock();
544 if (!err) {
545 switch (ecmd.speed) {
546 case SPEED_10000:
547 msec = 1;
548 div = 10000/1000;
549 break;
550 case SPEED_1000:
551 msec = 1;
552 div = 1000/1000;
553 break;
554 /*
555 * If the link speed is so slow you don't really
556 * need to worry about perf anyways
557 */
558 case SPEED_100:
559 case SPEED_10:
560 default:
561 return DEFAULT_PRB_RETIRE_TOV;
f6fb8f10 562 }
563 }
564
565 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
566
567 if (div)
568 mbits /= div;
569
570 tmo = mbits * msec;
571
572 if (div)
573 return tmo+1;
574 return tmo;
575}
576
bc59ba39 577static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
f6fb8f10 578 union tpacket_req_u *req_u)
579{
580 p1->feature_req_word = req_u->req3.tp_feature_req_word;
581}
582
583static void init_prb_bdqc(struct packet_sock *po,
584 struct packet_ring_buffer *rb,
585 struct pgv *pg_vec,
586 union tpacket_req_u *req_u, int tx_ring)
587{
bc59ba39 588 struct tpacket_kbdq_core *p1 = &rb->prb_bdqc;
589 struct tpacket_block_desc *pbd;
f6fb8f10 590
591 memset(p1, 0x0, sizeof(*p1));
592
593 p1->knxt_seq_num = 1;
594 p1->pkbdq = pg_vec;
bc59ba39 595 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
f6fb8f10 596 p1->pkblk_start = (char *)pg_vec[0].buffer;
597 p1->kblk_size = req_u->req3.tp_block_size;
598 p1->knum_blocks = req_u->req3.tp_block_nr;
599 p1->hdrlen = po->tp_hdrlen;
600 p1->version = po->tp_version;
601 p1->last_kactive_blk_num = 0;
602 po->stats_u.stats3.tp_freeze_q_cnt = 0;
603 if (req_u->req3.tp_retire_blk_tov)
604 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
605 else
606 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
607 req_u->req3.tp_block_size);
608 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
609 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
610
611 prb_init_ft_ops(p1, req_u);
612 prb_setup_retire_blk_timer(po, tx_ring);
613 prb_open_block(p1, pbd);
614}
615
616/* Do NOT update the last_blk_num first.
617 * Assumes sk_buff_head lock is held.
618 */
bc59ba39 619static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
f6fb8f10 620{
621 mod_timer(&pkc->retire_blk_timer,
622 jiffies + pkc->tov_in_jiffies);
623 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
624}
625
626/*
627 * Timer logic:
628 * 1) We refresh the timer only when we open a block.
629 * By doing this we don't waste cycles refreshing the timer
630 * on packet-by-packet basis.
631 *
632 * With a 1MB block-size, on a 1Gbps line, it will take
633 * i) ~8 ms to fill a block + ii) memcpy etc.
634 * In this cut we are not accounting for the memcpy time.
635 *
636 * So, if the user sets the 'tmo' to 10ms then the timer
637 * will never fire while the block is still getting filled
638 * (which is what we want). However, the user could choose
639 * to close a block early and that's fine.
640 *
641 * But when the timer does fire, we check whether or not to refresh it.
642 * Since the tmo granularity is in msecs, it is not too expensive
643 * to refresh the timer, lets say every '8' msecs.
644 * Either the user can set the 'tmo' or we can derive it based on
645 * a) line-speed and b) block-size.
646 * prb_calc_retire_blk_tmo() calculates the tmo.
647 *
648 */
649static void prb_retire_rx_blk_timer_expired(unsigned long data)
650{
651 struct packet_sock *po = (struct packet_sock *)data;
bc59ba39 652 struct tpacket_kbdq_core *pkc = &po->rx_ring.prb_bdqc;
f6fb8f10 653 unsigned int frozen;
bc59ba39 654 struct tpacket_block_desc *pbd;
f6fb8f10 655
656 spin_lock(&po->sk.sk_receive_queue.lock);
657
658 frozen = prb_queue_frozen(pkc);
659 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
660
661 if (unlikely(pkc->delete_blk_timer))
662 goto out;
663
664 /* We only need to plug the race when the block is partially filled.
665 * tpacket_rcv:
666 * lock(); increment BLOCK_NUM_PKTS; unlock()
667 * copy_bits() is in progress ...
668 * timer fires on other cpu:
669 * we can't retire the current block because copy_bits
670 * is in progress.
671 *
672 */
673 if (BLOCK_NUM_PKTS(pbd)) {
674 while (atomic_read(&pkc->blk_fill_in_prog)) {
675 /* Waiting for skb_copy_bits to finish... */
676 cpu_relax();
677 }
678 }
679
680 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
681 if (!frozen) {
682 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
683 if (!prb_dispatch_next_block(pkc, po))
684 goto refresh_timer;
685 else
686 goto out;
687 } else {
688 /* Case 1. Queue was frozen because user-space was
689 * lagging behind.
690 */
691 if (prb_curr_blk_in_use(pkc, pbd)) {
692 /*
693 * Ok, user-space is still behind.
694 * So just refresh the timer.
695 */
696 goto refresh_timer;
697 } else {
698 /* Case 2. queue was frozen,user-space caught up,
699 * now the link went idle && the timer fired.
700 * We don't have a block to close.So we open this
701 * block and restart the timer.
702 * opening a block thaws the queue,restarts timer
703 * Thawing/timer-refresh is a side effect.
704 */
705 prb_open_block(pkc, pbd);
706 goto out;
707 }
708 }
709 }
710
711refresh_timer:
712 _prb_refresh_rx_retire_blk_timer(pkc);
713
714out:
715 spin_unlock(&po->sk.sk_receive_queue.lock);
716}
717
eea49cc9 718static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
bc59ba39 719 struct tpacket_block_desc *pbd1, __u32 status)
f6fb8f10 720{
721 /* Flush everything minus the block header */
722
723#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
724 u8 *start, *end;
725
726 start = (u8 *)pbd1;
727
728 /* Skip the block header(we know header WILL fit in 4K) */
729 start += PAGE_SIZE;
730
731 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
732 for (; start < end; start += PAGE_SIZE)
733 flush_dcache_page(pgv_to_page(start));
734
735 smp_wmb();
736#endif
737
738 /* Now update the block status. */
739
740 BLOCK_STATUS(pbd1) = status;
741
742 /* Flush the block header */
743
744#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
745 start = (u8 *)pbd1;
746 flush_dcache_page(pgv_to_page(start));
747
748 smp_wmb();
749#endif
750}
751
752/*
753 * Side effect:
754 *
755 * 1) flush the block
756 * 2) Increment active_blk_num
757 *
758 * Note:We DONT refresh the timer on purpose.
759 * Because almost always the next block will be opened.
760 */
bc59ba39 761static void prb_close_block(struct tpacket_kbdq_core *pkc1,
762 struct tpacket_block_desc *pbd1,
f6fb8f10 763 struct packet_sock *po, unsigned int stat)
764{
765 __u32 status = TP_STATUS_USER | stat;
766
767 struct tpacket3_hdr *last_pkt;
bc59ba39 768 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
f6fb8f10 769
770 if (po->stats.tp_drops)
771 status |= TP_STATUS_LOSING;
772
773 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
774 last_pkt->tp_next_offset = 0;
775
776 /* Get the ts of the last pkt */
777 if (BLOCK_NUM_PKTS(pbd1)) {
778 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
779 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
780 } else {
781 /* Ok, we tmo'd - so get the current time */
782 struct timespec ts;
783 getnstimeofday(&ts);
784 h1->ts_last_pkt.ts_sec = ts.tv_sec;
785 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
786 }
787
788 smp_wmb();
789
790 /* Flush the block */
791 prb_flush_block(pkc1, pbd1, status);
792
793 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
794}
795
eea49cc9 796static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
f6fb8f10 797{
798 pkc->reset_pending_on_curr_blk = 0;
799}
800
801/*
802 * Side effect of opening a block:
803 *
804 * 1) prb_queue is thawed.
805 * 2) retire_blk_timer is refreshed.
806 *
807 */
bc59ba39 808static void prb_open_block(struct tpacket_kbdq_core *pkc1,
809 struct tpacket_block_desc *pbd1)
f6fb8f10 810{
811 struct timespec ts;
bc59ba39 812 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
f6fb8f10 813
814 smp_rmb();
815
816 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd1))) {
817
818 /* We could have just memset this but we will lose the
819 * flexibility of making the priv area sticky
820 */
821 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
822 BLOCK_NUM_PKTS(pbd1) = 0;
823 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
824 getnstimeofday(&ts);
825 h1->ts_first_pkt.ts_sec = ts.tv_sec;
826 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
827 pkc1->pkblk_start = (char *)pbd1;
828 pkc1->nxt_offset = (char *)(pkc1->pkblk_start +
829 BLK_PLUS_PRIV(pkc1->blk_sizeof_priv));
830 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
831 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
832 pbd1->version = pkc1->version;
833 pkc1->prev = pkc1->nxt_offset;
834 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
835 prb_thaw_queue(pkc1);
836 _prb_refresh_rx_retire_blk_timer(pkc1);
837
838 smp_wmb();
839
840 return;
841 }
842
843 WARN(1, "ERROR block:%p is NOT FREE status:%d kactive_blk_num:%d\n",
844 pbd1, BLOCK_STATUS(pbd1), pkc1->kactive_blk_num);
845 dump_stack();
846 BUG();
847}
848
849/*
850 * Queue freeze logic:
851 * 1) Assume tp_block_nr = 8 blocks.
852 * 2) At time 't0', user opens Rx ring.
853 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
854 * 4) user-space is either sleeping or processing block '0'.
855 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
856 * it will close block-7,loop around and try to fill block '0'.
857 * call-flow:
858 * __packet_lookup_frame_in_block
859 * prb_retire_current_block()
860 * prb_dispatch_next_block()
861 * |->(BLOCK_STATUS == USER) evaluates to true
862 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
863 * 6) Now there are two cases:
864 * 6.1) Link goes idle right after the queue is frozen.
865 * But remember, the last open_block() refreshed the timer.
866 * When this timer expires,it will refresh itself so that we can
867 * re-open block-0 in near future.
868 * 6.2) Link is busy and keeps on receiving packets. This is a simple
869 * case and __packet_lookup_frame_in_block will check if block-0
870 * is free and can now be re-used.
871 */
eea49cc9 872static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
f6fb8f10 873 struct packet_sock *po)
874{
875 pkc->reset_pending_on_curr_blk = 1;
876 po->stats_u.stats3.tp_freeze_q_cnt++;
877}
878
879#define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
880
881/*
882 * If the next block is free then we will dispatch it
883 * and return a good offset.
884 * Else, we will freeze the queue.
885 * So, caller must check the return value.
886 */
bc59ba39 887static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
f6fb8f10 888 struct packet_sock *po)
889{
bc59ba39 890 struct tpacket_block_desc *pbd;
f6fb8f10 891
892 smp_rmb();
893
894 /* 1. Get current block num */
895 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
896
897 /* 2. If this block is currently in_use then freeze the queue */
898 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
899 prb_freeze_queue(pkc, po);
900 return NULL;
901 }
902
903 /*
904 * 3.
905 * open this block and return the offset where the first packet
906 * needs to get stored.
907 */
908 prb_open_block(pkc, pbd);
909 return (void *)pkc->nxt_offset;
910}
911
bc59ba39 912static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
f6fb8f10 913 struct packet_sock *po, unsigned int status)
914{
bc59ba39 915 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
f6fb8f10 916
917 /* retire/close the current block */
918 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
919 /*
920 * Plug the case where copy_bits() is in progress on
921 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
922 * have space to copy the pkt in the current block and
923 * called prb_retire_current_block()
924 *
925 * We don't need to worry about the TMO case because
926 * the timer-handler already handled this case.
927 */
928 if (!(status & TP_STATUS_BLK_TMO)) {
929 while (atomic_read(&pkc->blk_fill_in_prog)) {
930 /* Waiting for skb_copy_bits to finish... */
931 cpu_relax();
932 }
933 }
934 prb_close_block(pkc, pbd, po, status);
935 return;
936 }
937
938 WARN(1, "ERROR-pbd[%d]:%p\n", pkc->kactive_blk_num, pbd);
939 dump_stack();
940 BUG();
941}
942
eea49cc9 943static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
bc59ba39 944 struct tpacket_block_desc *pbd)
f6fb8f10 945{
946 return TP_STATUS_USER & BLOCK_STATUS(pbd);
947}
948
eea49cc9 949static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
f6fb8f10 950{
951 return pkc->reset_pending_on_curr_blk;
952}
953
eea49cc9 954static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
f6fb8f10 955{
bc59ba39 956 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
f6fb8f10 957 atomic_dec(&pkc->blk_fill_in_prog);
958}
959
eea49cc9 960static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
f6fb8f10 961 struct tpacket3_hdr *ppd)
962{
963 ppd->hv1.tp_rxhash = skb_get_rxhash(pkc->skb);
964}
965
eea49cc9 966static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
f6fb8f10 967 struct tpacket3_hdr *ppd)
968{
969 ppd->hv1.tp_rxhash = 0;
970}
971
eea49cc9 972static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
f6fb8f10 973 struct tpacket3_hdr *ppd)
974{
975 if (vlan_tx_tag_present(pkc->skb)) {
976 ppd->hv1.tp_vlan_tci = vlan_tx_tag_get(pkc->skb);
977 ppd->tp_status = TP_STATUS_VLAN_VALID;
978 } else {
979 ppd->hv1.tp_vlan_tci = ppd->tp_status = 0;
980 }
981}
982
bc59ba39 983static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
f6fb8f10 984 struct tpacket3_hdr *ppd)
985{
986 prb_fill_vlan_info(pkc, ppd);
987
988 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
989 prb_fill_rxhash(pkc, ppd);
990 else
991 prb_clear_rxhash(pkc, ppd);
992}
993
eea49cc9 994static void prb_fill_curr_block(char *curr,
bc59ba39 995 struct tpacket_kbdq_core *pkc,
996 struct tpacket_block_desc *pbd,
f6fb8f10 997 unsigned int len)
998{
999 struct tpacket3_hdr *ppd;
1000
1001 ppd = (struct tpacket3_hdr *)curr;
1002 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1003 pkc->prev = curr;
1004 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1005 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1006 BLOCK_NUM_PKTS(pbd) += 1;
1007 atomic_inc(&pkc->blk_fill_in_prog);
1008 prb_run_all_ft_ops(pkc, ppd);
1009}
1010
1011/* Assumes caller has the sk->rx_queue.lock */
1012static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1013 struct sk_buff *skb,
1014 int status,
1015 unsigned int len
1016 )
1017{
bc59ba39 1018 struct tpacket_kbdq_core *pkc;
1019 struct tpacket_block_desc *pbd;
f6fb8f10 1020 char *curr, *end;
1021
1022 pkc = GET_PBDQC_FROM_RB(((struct packet_ring_buffer *)&po->rx_ring));
1023 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1024
1025 /* Queue is frozen when user space is lagging behind */
1026 if (prb_queue_frozen(pkc)) {
1027 /*
1028 * Check if that last block which caused the queue to freeze,
1029 * is still in_use by user-space.
1030 */
1031 if (prb_curr_blk_in_use(pkc, pbd)) {
1032 /* Can't record this packet */
1033 return NULL;
1034 } else {
1035 /*
1036 * Ok, the block was released by user-space.
1037 * Now let's open that block.
1038 * opening a block also thaws the queue.
1039 * Thawing is a side effect.
1040 */
1041 prb_open_block(pkc, pbd);
1042 }
1043 }
1044
1045 smp_mb();
1046 curr = pkc->nxt_offset;
1047 pkc->skb = skb;
1048 end = (char *) ((char *)pbd + pkc->kblk_size);
1049
1050 /* first try the current block */
1051 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1052 prb_fill_curr_block(curr, pkc, pbd, len);
1053 return (void *)curr;
1054 }
1055
1056 /* Ok, close the current block */
1057 prb_retire_current_block(pkc, po, 0);
1058
1059 /* Now, try to dispatch the next block */
1060 curr = (char *)prb_dispatch_next_block(pkc, po);
1061 if (curr) {
1062 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1063 prb_fill_curr_block(curr, pkc, pbd, len);
1064 return (void *)curr;
1065 }
1066
1067 /*
1068 * No free blocks are available.user_space hasn't caught up yet.
1069 * Queue was just frozen and now this packet will get dropped.
1070 */
1071 return NULL;
1072}
1073
eea49cc9 1074static void *packet_current_rx_frame(struct packet_sock *po,
f6fb8f10 1075 struct sk_buff *skb,
1076 int status, unsigned int len)
1077{
1078 char *curr = NULL;
1079 switch (po->tp_version) {
1080 case TPACKET_V1:
1081 case TPACKET_V2:
1082 curr = packet_lookup_frame(po, &po->rx_ring,
1083 po->rx_ring.head, status);
1084 return curr;
1085 case TPACKET_V3:
1086 return __packet_lookup_frame_in_block(po, skb, status, len);
1087 default:
1088 WARN(1, "TPACKET version not supported\n");
1089 BUG();
1090 return 0;
1091 }
1092}
1093
eea49cc9 1094static void *prb_lookup_block(struct packet_sock *po,
f6fb8f10 1095 struct packet_ring_buffer *rb,
1096 unsigned int previous,
1097 int status)
1098{
bc59ba39 1099 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1100 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, previous);
f6fb8f10 1101
1102 if (status != BLOCK_STATUS(pbd))
1103 return NULL;
1104 return pbd;
1105}
1106
eea49cc9 1107static int prb_previous_blk_num(struct packet_ring_buffer *rb)
f6fb8f10 1108{
1109 unsigned int prev;
1110 if (rb->prb_bdqc.kactive_blk_num)
1111 prev = rb->prb_bdqc.kactive_blk_num-1;
1112 else
1113 prev = rb->prb_bdqc.knum_blocks-1;
1114 return prev;
1115}
1116
1117/* Assumes caller has held the rx_queue.lock */
eea49cc9 1118static void *__prb_previous_block(struct packet_sock *po,
f6fb8f10 1119 struct packet_ring_buffer *rb,
1120 int status)
1121{
1122 unsigned int previous = prb_previous_blk_num(rb);
1123 return prb_lookup_block(po, rb, previous, status);
1124}
1125
eea49cc9 1126static void *packet_previous_rx_frame(struct packet_sock *po,
f6fb8f10 1127 struct packet_ring_buffer *rb,
1128 int status)
1129{
1130 if (po->tp_version <= TPACKET_V2)
1131 return packet_previous_frame(po, rb, status);
1132
1133 return __prb_previous_block(po, rb, status);
1134}
1135
eea49cc9 1136static void packet_increment_rx_head(struct packet_sock *po,
f6fb8f10 1137 struct packet_ring_buffer *rb)
1138{
1139 switch (po->tp_version) {
1140 case TPACKET_V1:
1141 case TPACKET_V2:
1142 return packet_increment_head(rb);
1143 case TPACKET_V3:
1144 default:
1145 WARN(1, "TPACKET version not supported.\n");
1146 BUG();
1147 return;
1148 }
1149}
1150
eea49cc9 1151static void *packet_previous_frame(struct packet_sock *po,
69e3c75f
JB		 1152 struct packet_ring_buffer *rb,
1153 int status)
1154{
1155 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1156 return packet_lookup_frame(po, rb, previous, status);
1157}
1158
eea49cc9 1159static void packet_increment_head(struct packet_ring_buffer *buff)
69e3c75f
JB		 1160{
1161 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1162}
1163
1da177e4
LT		 1164static void packet_sock_destruct(struct sock *sk)
1165{
ed85b565
RC		 1166 skb_queue_purge(&sk->sk_error_queue);
1167
547b792c
IJ		 1168 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1169 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1da177e4
LT		 1170
1171 if (!sock_flag(sk, SOCK_DEAD)) {
40d4e3df 1172 pr_err("Attempt to release alive packet socket: %p\n", sk);
1da177e4
LT		 1173 return;
1174 }
1175
17ab56a2 1176 sk_refcnt_debug_dec(sk);
1da177e4
LT		 1177}
1178
dc99f600
DM		 1179static int fanout_rr_next(struct packet_fanout *f, unsigned int num)
1180{
1181 int x = atomic_read(&f->rr_cur) + 1;
1182
1183 if (x >= num)
1184 x = 0;
1185
1186 return x;
1187}
1188
1189static struct sock *fanout_demux_hash(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1190{
1191 u32 idx, hash = skb->rxhash;
1192
1193 idx = ((u64)hash * num) >> 32;
1194
1195 return f->arr[idx];
1196}
1197
1198static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1199{
1200 int cur, old;
1201
1202 cur = atomic_read(&f->rr_cur);
1203 while ((old = atomic_cmpxchg(&f->rr_cur, cur,
1204 fanout_rr_next(f, num))) != cur)
1205 cur = old;
1206 return f->arr[cur];
1207}
1208
95ec3eb4
DM		 1209static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1210{
1211 unsigned int cpu = smp_processor_id();
1212
1213 return f->arr[cpu % num];
1214}
1215
95ec3eb4
DM		 1216static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1217 struct packet_type *pt, struct net_device *orig_dev)
dc99f600
DM		 1218{
1219 struct packet_fanout *f = pt->af_packet_priv;
1220 unsigned int num = f->num_members;
1221 struct packet_sock *po;
1222 struct sock *sk;
1223
1224 if (!net_eq(dev_net(dev), read_pnet(&f->net)) ||
1225 !num) {
1226 kfree_skb(skb);
1227 return 0;
1228 }
1229
95ec3eb4
DM		 1230 switch (f->type) {
1231 case PACKET_FANOUT_HASH:
1232 default:
1233 if (f->defrag) {
bc416d97 1234 skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET);
95ec3eb4
DM		 1235 if (!skb)
1236 return 0;
1237 }
1238 skb_get_rxhash(skb);
1239 sk = fanout_demux_hash(f, skb, num);
1240 break;
1241 case PACKET_FANOUT_LB:
1242 sk = fanout_demux_lb(f, skb, num);
1243 break;
1244 case PACKET_FANOUT_CPU:
1245 sk = fanout_demux_cpu(f, skb, num);
1246 break;
dc99f600
DM		 1247 }
1248
dc99f600
DM		 1249 po = pkt_sk(sk);
1250
1251 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1252}
1253
1254static DEFINE_MUTEX(fanout_mutex);
1255static LIST_HEAD(fanout_list);
1256
1257static void __fanout_link(struct sock *sk, struct packet_sock *po)
1258{
1259 struct packet_fanout *f = po->fanout;
1260
1261 spin_lock(&f->lock);
1262 f->arr[f->num_members] = sk;
1263 smp_wmb();
1264 f->num_members++;
1265 spin_unlock(&f->lock);
1266}
1267
1268static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1269{
1270 struct packet_fanout *f = po->fanout;
1271 int i;
1272
1273 spin_lock(&f->lock);
1274 for (i = 0; i < f->num_members; i++) {
1275 if (f->arr[i] == sk)
1276 break;
1277 }
1278 BUG_ON(i >= f->num_members);
1279 f->arr[i] = f->arr[f->num_members - 1];
1280 f->num_members--;
1281 spin_unlock(&f->lock);
1282}
1283
7736d33f 1284static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
dc99f600
DM		 1285{
1286 struct packet_sock *po = pkt_sk(sk);
1287 struct packet_fanout *f, *match;
7736d33f
DM		 1288 u8 type = type_flags & 0xff;
1289 u8 defrag = (type_flags & PACKET_FANOUT_FLAG_DEFRAG) ? 1 : 0;
dc99f600
DM		 1290 int err;
1291
1292 switch (type) {
1293 case PACKET_FANOUT_HASH:
1294 case PACKET_FANOUT_LB:
95ec3eb4 1295 case PACKET_FANOUT_CPU:
dc99f600
DM		 1296 break;
1297 default:
1298 return -EINVAL;
1299 }
1300
1301 if (!po->running)
1302 return -EINVAL;
1303
1304 if (po->fanout)
1305 return -EALREADY;
1306
1307 mutex_lock(&fanout_mutex);
1308 match = NULL;
1309 list_for_each_entry(f, &fanout_list, list) {
1310 if (f->id == id &&
1311 read_pnet(&f->net) == sock_net(sk)) {
1312 match = f;
1313 break;
1314 }
1315 }
afe62c68 1316 err = -EINVAL;
7736d33f 1317 if (match && match->defrag != defrag)
afe62c68 1318 goto out;
dc99f600 1319 if (!match) {
afe62c68 1320 err = -ENOMEM;
dc99f600 1321 match = kzalloc(sizeof(*match), GFP_KERNEL);
afe62c68
ED		 1322 if (!match)
1323 goto out;
1324 write_pnet(&match->net, sock_net(sk));
1325 match->id = id;
1326 match->type = type;
1327 match->defrag = defrag;
1328 atomic_set(&match->rr_cur, 0);
1329 INIT_LIST_HEAD(&match->list);
1330 spin_lock_init(&match->lock);
1331 atomic_set(&match->sk_ref, 0);
1332 match->prot_hook.type = po->prot_hook.type;
1333 match->prot_hook.dev = po->prot_hook.dev;
1334 match->prot_hook.func = packet_rcv_fanout;
1335 match->prot_hook.af_packet_priv = match;
1336 dev_add_pack(&match->prot_hook);
1337 list_add(&match->list, &fanout_list);
dc99f600 1338 }
afe62c68
ED		 1339 err = -EINVAL;
1340 if (match->type == type &&
1341 match->prot_hook.type == po->prot_hook.type &&
1342 match->prot_hook.dev == po->prot_hook.dev) {
1343 err = -ENOSPC;
1344 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1345 __dev_remove_pack(&po->prot_hook);
1346 po->fanout = match;
1347 atomic_inc(&match->sk_ref);
1348 __fanout_link(sk, po);
1349 err = 0;
dc99f600
DM		 1350 }
1351 }
afe62c68 1352out:
dc99f600
DM		 1353 mutex_unlock(&fanout_mutex);
1354 return err;
1355}
1356
1357static void fanout_release(struct sock *sk)
1358{
1359 struct packet_sock *po = pkt_sk(sk);
1360 struct packet_fanout *f;
1361
1362 f = po->fanout;
1363 if (!f)
1364 return;
1365
1366 po->fanout = NULL;
1367
1368 mutex_lock(&fanout_mutex);
1369 if (atomic_dec_and_test(&f->sk_ref)) {
1370 list_del(&f->list);
1371 dev_remove_pack(&f->prot_hook);
1372 kfree(f);
1373 }
1374 mutex_unlock(&fanout_mutex);
1375}
1da177e4 1376
90ddc4f0 1377static const struct proto_ops packet_ops;
1da177e4 1378
90ddc4f0 1379static const struct proto_ops packet_ops_spkt;
1da177e4 1380
40d4e3df
ED		 1381static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1382 struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 1383{
1384 struct sock *sk;
1385 struct sockaddr_pkt *spkt;
1386
1387 /*
1388 * When we registered the protocol we saved the socket in the data
1389 * field for just this event.
1390 */
1391
1392 sk = pt->af_packet_priv;
1ce4f28b 1393
1da177e4
LT		 1394 /*
1395 * Yank back the headers [hope the device set this
1396 * right or kerboom...]
1397 *
1398 * Incoming packets have ll header pulled,
1399 * push it back.
1400 *
98e399f8 1401 * For outgoing ones skb->data == skb_mac_header(skb)
1da177e4
LT		 1402 * so that this procedure is noop.
1403 */
1404
1405 if (skb->pkt_type == PACKET_LOOPBACK)
1406 goto out;
1407
09ad9bc7 1408 if (!net_eq(dev_net(dev), sock_net(sk)))
d12d01d6
DL		 1409 goto out;
1410
40d4e3df
ED		 1411 skb = skb_share_check(skb, GFP_ATOMIC);
1412 if (skb == NULL)
1da177e4
LT		 1413 goto oom;
1414
1415 /* drop any routing info */
adf30907 1416 skb_dst_drop(skb);
1da177e4 1417
84531c24
PO		 1418 /* drop conntrack reference */
1419 nf_reset(skb);
1420
ffbc6111 1421 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1da177e4 1422
98e399f8 1423 skb_push(skb, skb->data - skb_mac_header(skb));
1da177e4
LT		 1424
1425 /*
1426 * The SOCK_PACKET socket receives _all_ frames.
1427 */
1428
1429 spkt->spkt_family = dev->type;
1430 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1431 spkt->spkt_protocol = skb->protocol;
1432
1433 /*
1434 * Charge the memory to the socket. This is done specifically
1435 * to prevent sockets using all the memory up.
1436 */
1437
40d4e3df 1438 if (sock_queue_rcv_skb(sk, skb) == 0)
1da177e4
LT		 1439 return 0;
1440
1441out:
1442 kfree_skb(skb);
1443oom:
1444 return 0;
1445}
1446
1447
1448/*
1449 * Output a raw packet to a device layer. This bypasses all the other
1450 * protocol layers and you must therefore supply it with a complete frame
1451 */
1ce4f28b 1452
1da177e4
LT		 1453static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
1454 struct msghdr *msg, size_t len)
1455{
1456 struct sock *sk = sock->sk;
40d4e3df 1457 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
1a35ca80 1458 struct sk_buff *skb = NULL;
1da177e4 1459 struct net_device *dev;
40d4e3df 1460 __be16 proto = 0;
1da177e4 1461 int err;
1ce4f28b 1462
1da177e4 1463 /*
1ce4f28b 1464 * Get and verify the address.
1da177e4
LT		 1465 */
1466
40d4e3df 1467 if (saddr) {
1da177e4 1468 if (msg->msg_namelen < sizeof(struct sockaddr))
40d4e3df
ED		 1469 return -EINVAL;
1470 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1471 proto = saddr->spkt_protocol;
1472 } else
1473 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1da177e4
LT		 1474
1475 /*
1ce4f28b 1476 * Find the device first to size check it
1da177e4
LT		 1477 */
1478
1479 saddr->spkt_device[13] = 0;
1a35ca80 1480retry:
654d1f8a
ED		 1481 rcu_read_lock();
1482 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1da177e4
LT		 1483 err = -ENODEV;
1484 if (dev == NULL)
1485 goto out_unlock;
1ce4f28b 1486
d5e76b0a
DM		 1487 err = -ENETDOWN;
1488 if (!(dev->flags & IFF_UP))
1489 goto out_unlock;
1490
1da177e4 1491 /*
40d4e3df
ED		 1492 * You may not queue a frame bigger than the mtu. This is the lowest level
1493 * raw protocol and you must do your own fragmentation at this level.
1da177e4 1494 */
1ce4f28b 1495
1da177e4 1496 err = -EMSGSIZE;
57f89bfa 1497 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
1da177e4
LT		 1498 goto out_unlock;
1499
1a35ca80
ED		 1500 if (!skb) {
1501 size_t reserved = LL_RESERVED_SPACE(dev);
4ce40912 1502 int tlen = dev->needed_tailroom;
1a35ca80
ED		 1503 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1504
1505 rcu_read_unlock();
4ce40912 1506 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1a35ca80
ED		 1507 if (skb == NULL)
1508 return -ENOBUFS;
1509 /* FIXME: Save some space for broken drivers that write a hard
1510 * header at transmission time by themselves. PPP is the notable
1511 * one here. This should really be fixed at the driver level.
1512 */
1513 skb_reserve(skb, reserved);
1514 skb_reset_network_header(skb);
1515
1516 /* Try to align data part correctly */
1517 if (hhlen) {
1518 skb->data -= hhlen;
1519 skb->tail -= hhlen;
1520 if (len < hhlen)
1521 skb_reset_network_header(skb);
1522 }
1523 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1524 if (err)
1525 goto out_free;
1526 goto retry;
1da177e4
LT		 1527 }
1528
57f89bfa
BG		 1529 if (len > (dev->mtu + dev->hard_header_len)) {
1530 /* Earlier code assumed this would be a VLAN pkt,
1531 * double-check this now that we have the actual
1532 * packet in hand.
1533 */
1534 struct ethhdr *ehdr;
1535 skb_reset_mac_header(skb);
1536 ehdr = eth_hdr(skb);
1537 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
1538 err = -EMSGSIZE;
1539 goto out_unlock;
1540 }
1541 }
1a35ca80 1542
1da177e4
LT		 1543 skb->protocol = proto;
1544 skb->dev = dev;
1545 skb->priority = sk->sk_priority;
2d37a186 1546 skb->mark = sk->sk_mark;
2244d07b 1547 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
ed85b565
RC		 1548 if (err < 0)
1549 goto out_unlock;
1da177e4
LT		 1550
1551 dev_queue_xmit(skb);
654d1f8a 1552 rcu_read_unlock();
40d4e3df 1553 return len;
1da177e4 1554
1da177e4 1555out_unlock:
654d1f8a 1556 rcu_read_unlock();
1a35ca80
ED		 1557out_free:
1558 kfree_skb(skb);
1da177e4
LT		 1559 return err;
1560}
1da177e4 1561
eea49cc9 1562static unsigned int run_filter(const struct sk_buff *skb,
62ab0812 1563 const struct sock *sk,
dbcb5855 1564 unsigned int res)
1da177e4
LT		 1565{
1566 struct sk_filter *filter;
fda9ef5d 1567
80f8f102
ED		 1568 rcu_read_lock();
1569 filter = rcu_dereference(sk->sk_filter);
dbcb5855 1570 if (filter != NULL)
0a14842f 1571 res = SK_RUN_FILTER(filter, skb);
80f8f102 1572 rcu_read_unlock();
1da177e4 1573
dbcb5855 1574 return res;
1da177e4
LT		 1575}
1576
1577/*
62ab0812
ED		 1578 * This function makes lazy skb cloning in hope that most of packets
1579 * are discarded by BPF.
1580 *
1581 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1582 * and skb->cb are mangled. It works because (and until) packets
1583 * falling here are owned by current CPU. Output packets are cloned
1584 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1585 * sequencially, so that if we return skb to original state on exit,
1586 * we will not harm anyone.
1da177e4
LT		 1587 */
1588
40d4e3df
ED		 1589static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
1590 struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 1591{
1592 struct sock *sk;
1593 struct sockaddr_ll *sll;
1594 struct packet_sock *po;
40d4e3df 1595 u8 *skb_head = skb->data;
1da177e4 1596 int skb_len = skb->len;
dbcb5855 1597 unsigned int snaplen, res;
1da177e4
LT		 1598
1599 if (skb->pkt_type == PACKET_LOOPBACK)
1600 goto drop;
1601
1602 sk = pt->af_packet_priv;
1603 po = pkt_sk(sk);
1604
09ad9bc7 1605 if (!net_eq(dev_net(dev), sock_net(sk)))
d12d01d6
DL		 1606 goto drop;
1607
1da177e4
LT		 1608 skb->dev = dev;
1609
3b04ddde 1610 if (dev->header_ops) {
1da177e4 1611 /* The device has an explicit notion of ll header,
62ab0812
ED		 1612 * exported to higher levels.
1613 *
1614 * Otherwise, the device hides details of its frame
1615 * structure, so that corresponding packet head is
1616 * never delivered to user.
1da177e4
LT		 1617 */
1618 if (sk->sk_type != SOCK_DGRAM)
98e399f8 1619 skb_push(skb, skb->data - skb_mac_header(skb));
1da177e4
LT		 1620 else if (skb->pkt_type == PACKET_OUTGOING) {
1621 /* Special case: outgoing packets have ll header at head */
bbe735e4 1622 skb_pull(skb, skb_network_offset(skb));
1da177e4
LT		 1623 }
1624 }
1625
1626 snaplen = skb->len;
1627
dbcb5855
DM		 1628 res = run_filter(skb, sk, snaplen);
1629 if (!res)
fda9ef5d 1630 goto drop_n_restore;
dbcb5855
DM		 1631 if (snaplen > res)
1632 snaplen = res;
1da177e4 1633
0fd7bac6 1634 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
1da177e4
LT		 1635 goto drop_n_acct;
1636
1637 if (skb_shared(skb)) {
1638 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1639 if (nskb == NULL)
1640 goto drop_n_acct;
1641
1642 if (skb_head != skb->data) {
1643 skb->data = skb_head;
1644 skb->len = skb_len;
1645 }
1646 kfree_skb(skb);
1647 skb = nskb;
1648 }
1649
ffbc6111
HX		 1650 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
1651 sizeof(skb->cb));
1652
1653 sll = &PACKET_SKB_CB(skb)->sa.ll;
1da177e4
LT		 1654 sll->sll_family = AF_PACKET;
1655 sll->sll_hatype = dev->type;
1656 sll->sll_protocol = skb->protocol;
1657 sll->sll_pkttype = skb->pkt_type;
8032b464 1658 if (unlikely(po->origdev))
80feaacb
PWJ		 1659 sll->sll_ifindex = orig_dev->ifindex;
1660 else
1661 sll->sll_ifindex = dev->ifindex;
1da177e4 1662
b95cce35 1663 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1da177e4 1664
ffbc6111 1665 PACKET_SKB_CB(skb)->origlen = skb->len;
8dc41944 1666
1da177e4
LT		 1667 if (pskb_trim(skb, snaplen))
1668 goto drop_n_acct;
1669
1670 skb_set_owner_r(skb, sk);
1671 skb->dev = NULL;
adf30907 1672 skb_dst_drop(skb);
1da177e4 1673
84531c24
PO		 1674 /* drop conntrack reference */
1675 nf_reset(skb);
1676
1da177e4
LT		 1677 spin_lock(&sk->sk_receive_queue.lock);
1678 po->stats.tp_packets++;
3b885787 1679 skb->dropcount = atomic_read(&sk->sk_drops);
1da177e4
LT		 1680 __skb_queue_tail(&sk->sk_receive_queue, skb);
1681 spin_unlock(&sk->sk_receive_queue.lock);
1682 sk->sk_data_ready(sk, skb->len);
1683 return 0;
1684
1685drop_n_acct:
7091fbd8
WB		 1686 spin_lock(&sk->sk_receive_queue.lock);
1687 po->stats.tp_drops++;
1688 atomic_inc(&sk->sk_drops);
1689 spin_unlock(&sk->sk_receive_queue.lock);
1da177e4
LT		 1690
1691drop_n_restore:
1692 if (skb_head != skb->data && skb_shared(skb)) {
1693 skb->data = skb_head;
1694 skb->len = skb_len;
1695 }
1696drop:
ead2ceb0 1697 consume_skb(skb);
1da177e4
LT		 1698 return 0;
1699}
1700
40d4e3df
ED		 1701static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
1702 struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 1703{
1704 struct sock *sk;
1705 struct packet_sock *po;
1706 struct sockaddr_ll *sll;
bbd6ef87
PM		 1707 union {
1708 struct tpacket_hdr *h1;
1709 struct tpacket2_hdr *h2;
f6fb8f10 1710 struct tpacket3_hdr *h3;
bbd6ef87
PM		 1711 void *raw;
1712 } h;
40d4e3df 1713 u8 *skb_head = skb->data;
1da177e4 1714 int skb_len = skb->len;
dbcb5855 1715 unsigned int snaplen, res;
f6fb8f10 1716 unsigned long status = TP_STATUS_USER;
bbd6ef87 1717 unsigned short macoff, netoff, hdrlen;
1da177e4 1718 struct sk_buff *copy_skb = NULL;
b7aa0bf7 1719 struct timeval tv;
bbd6ef87 1720 struct timespec ts;
614f60fa 1721 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
1da177e4
LT		 1722
1723 if (skb->pkt_type == PACKET_LOOPBACK)
1724 goto drop;
1725
1726 sk = pt->af_packet_priv;
1727 po = pkt_sk(sk);
1728
09ad9bc7 1729 if (!net_eq(dev_net(dev), sock_net(sk)))
d12d01d6
DL		 1730 goto drop;
1731
3b04ddde 1732 if (dev->header_ops) {
1da177e4 1733 if (sk->sk_type != SOCK_DGRAM)
98e399f8 1734 skb_push(skb, skb->data - skb_mac_header(skb));
1da177e4
LT		 1735 else if (skb->pkt_type == PACKET_OUTGOING) {
1736 /* Special case: outgoing packets have ll header at head */
bbe735e4 1737 skb_pull(skb, skb_network_offset(skb));
1da177e4
LT		 1738 }
1739 }
1740
8dc41944
HX		 1741 if (skb->ip_summed == CHECKSUM_PARTIAL)
1742 status |= TP_STATUS_CSUMNOTREADY;
1743
1da177e4
LT		 1744 snaplen = skb->len;
1745
dbcb5855
DM		 1746 res = run_filter(skb, sk, snaplen);
1747 if (!res)
fda9ef5d 1748 goto drop_n_restore;
dbcb5855
DM		 1749 if (snaplen > res)
1750 snaplen = res;
1da177e4
LT		 1751
1752 if (sk->sk_type == SOCK_DGRAM) {
8913336a
PM		 1753 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
1754 po->tp_reserve;
1da177e4 1755 } else {
bbe735e4 1756 unsigned maclen = skb_network_offset(skb);
bbd6ef87 1757 netoff = TPACKET_ALIGN(po->tp_hdrlen +
8913336a
PM		 1758 (maclen < 16 ? 16 : maclen)) +
1759 po->tp_reserve;
1da177e4
LT		 1760 macoff = netoff - maclen;
1761 }
f6fb8f10 1762 if (po->tp_version <= TPACKET_V2) {
1763 if (macoff + snaplen > po->rx_ring.frame_size) {
1764 if (po->copy_thresh &&
0fd7bac6 1765 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
f6fb8f10 1766 if (skb_shared(skb)) {
1767 copy_skb = skb_clone(skb, GFP_ATOMIC);
1768 } else {
1769 copy_skb = skb_get(skb);
1770 skb_head = skb->data;
1771 }
1772 if (copy_skb)
1773 skb_set_owner_r(copy_skb, sk);
1da177e4 1774 }
f6fb8f10 1775 snaplen = po->rx_ring.frame_size - macoff;
1776 if ((int)snaplen < 0)
1777 snaplen = 0;
1da177e4 1778 }
1da177e4 1779 }
1da177e4 1780 spin_lock(&sk->sk_receive_queue.lock);
f6fb8f10 1781 h.raw = packet_current_rx_frame(po, skb,
1782 TP_STATUS_KERNEL, (macoff+snaplen));
bbd6ef87 1783 if (!h.raw)
1da177e4 1784 goto ring_is_full;
f6fb8f10 1785 if (po->tp_version <= TPACKET_V2) {
1786 packet_increment_rx_head(po, &po->rx_ring);
1787 /*
1788 * LOSING will be reported till you read the stats,
1789 * because it's COR - Clear On Read.
1790 * Anyways, moving it for V1/V2 only as V3 doesn't need this
1791 * at packet level.
1792 */
1793 if (po->stats.tp_drops)
1794 status |= TP_STATUS_LOSING;
1795 }
1da177e4
LT		 1796 po->stats.tp_packets++;
1797 if (copy_skb) {
1798 status |= TP_STATUS_COPY;
1799 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
1800 }
1da177e4
LT		 1801 spin_unlock(&sk->sk_receive_queue.lock);
1802
bbd6ef87 1803 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
1da177e4 1804
bbd6ef87
PM		 1805 switch (po->tp_version) {
1806 case TPACKET_V1:
1807 h.h1->tp_len = skb->len;
1808 h.h1->tp_snaplen = snaplen;
1809 h.h1->tp_mac = macoff;
1810 h.h1->tp_net = netoff;
614f60fa
SM		 1811 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1812 && shhwtstamps->syststamp.tv64)
1813 tv = ktime_to_timeval(shhwtstamps->syststamp);
1814 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1815 && shhwtstamps->hwtstamp.tv64)
1816 tv = ktime_to_timeval(shhwtstamps->hwtstamp);
1817 else if (skb->tstamp.tv64)
bbd6ef87
PM		 1818 tv = ktime_to_timeval(skb->tstamp);
1819 else
1820 do_gettimeofday(&tv);
1821 h.h1->tp_sec = tv.tv_sec;
1822 h.h1->tp_usec = tv.tv_usec;
1823 hdrlen = sizeof(*h.h1);
1824 break;
1825 case TPACKET_V2:
1826 h.h2->tp_len = skb->len;
1827 h.h2->tp_snaplen = snaplen;
1828 h.h2->tp_mac = macoff;
1829 h.h2->tp_net = netoff;
614f60fa
SM		 1830 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1831 && shhwtstamps->syststamp.tv64)
1832 ts = ktime_to_timespec(shhwtstamps->syststamp);
1833 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1834 && shhwtstamps->hwtstamp.tv64)
1835 ts = ktime_to_timespec(shhwtstamps->hwtstamp);
1836 else if (skb->tstamp.tv64)
bbd6ef87
PM		 1837 ts = ktime_to_timespec(skb->tstamp);
1838 else
1839 getnstimeofday(&ts);
1840 h.h2->tp_sec = ts.tv_sec;
1841 h.h2->tp_nsec = ts.tv_nsec;
a3bcc23e
BG		 1842 if (vlan_tx_tag_present(skb)) {
1843 h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
1844 status |= TP_STATUS_VLAN_VALID;
1845 } else {
1846 h.h2->tp_vlan_tci = 0;
1847 }
13fcb7bd 1848 h.h2->tp_padding = 0;
bbd6ef87
PM		 1849 hdrlen = sizeof(*h.h2);
1850 break;
f6fb8f10 1851 case TPACKET_V3:
1852 /* tp_nxt_offset,vlan are already populated above.
1853 * So DONT clear those fields here
1854 */
1855 h.h3->tp_status |= status;
1856 h.h3->tp_len = skb->len;
1857 h.h3->tp_snaplen = snaplen;
1858 h.h3->tp_mac = macoff;
1859 h.h3->tp_net = netoff;
1860 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1861 && shhwtstamps->syststamp.tv64)
1862 ts = ktime_to_timespec(shhwtstamps->syststamp);
1863 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1864 && shhwtstamps->hwtstamp.tv64)
1865 ts = ktime_to_timespec(shhwtstamps->hwtstamp);
1866 else if (skb->tstamp.tv64)
1867 ts = ktime_to_timespec(skb->tstamp);
1868 else
1869 getnstimeofday(&ts);
1870 h.h3->tp_sec = ts.tv_sec;
1871 h.h3->tp_nsec = ts.tv_nsec;
1872 hdrlen = sizeof(*h.h3);
1873 break;
bbd6ef87
PM		 1874 default:
1875 BUG();
1876 }
1da177e4 1877
bbd6ef87 1878 sll = h.raw + TPACKET_ALIGN(hdrlen);
b95cce35 1879 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1da177e4
LT		 1880 sll->sll_family = AF_PACKET;
1881 sll->sll_hatype = dev->type;
1882 sll->sll_protocol = skb->protocol;
1883 sll->sll_pkttype = skb->pkt_type;
8032b464 1884 if (unlikely(po->origdev))
80feaacb
PWJ		 1885 sll->sll_ifindex = orig_dev->ifindex;
1886 else
1887 sll->sll_ifindex = dev->ifindex;
1da177e4 1888
e16aa207 1889 smp_mb();
f6dafa95 1890#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
1da177e4 1891 {
0af55bb5
CG		 1892 u8 *start, *end;
1893
f6fb8f10 1894 if (po->tp_version <= TPACKET_V2) {
1895 end = (u8 *)PAGE_ALIGN((unsigned long)h.raw
1896 + macoff + snaplen);
1897 for (start = h.raw; start < end; start += PAGE_SIZE)
1898 flush_dcache_page(pgv_to_page(start));
1899 }
cc9f01b2 1900 smp_wmb();
1da177e4 1901 }
f6dafa95 1902#endif
f6fb8f10 1903 if (po->tp_version <= TPACKET_V2)
1904 __packet_set_status(po, h.raw, status);
1905 else
1906 prb_clear_blk_fill_status(&po->rx_ring);
1da177e4
LT		 1907
1908 sk->sk_data_ready(sk, 0);
1909
1910drop_n_restore:
1911 if (skb_head != skb->data && skb_shared(skb)) {
1912 skb->data = skb_head;
1913 skb->len = skb_len;
1914 }
1915drop:
1ce4f28b 1916 kfree_skb(skb);
1da177e4
LT		 1917 return 0;
1918
1919ring_is_full:
1920 po->stats.tp_drops++;
1921 spin_unlock(&sk->sk_receive_queue.lock);
1922
1923 sk->sk_data_ready(sk, 0);
acb5d75b 1924 kfree_skb(copy_skb);
1da177e4
LT		 1925 goto drop_n_restore;
1926}
1927
69e3c75f
JB		 1928static void tpacket_destruct_skb(struct sk_buff *skb)
1929{
1930 struct packet_sock *po = pkt_sk(skb->sk);
40d4e3df 1931 void *ph;
1da177e4 1932
69e3c75f
JB		 1933 if (likely(po->tx_ring.pg_vec)) {
1934 ph = skb_shinfo(skb)->destructor_arg;
1935 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
1936 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
1937 atomic_dec(&po->tx_ring.pending);
1938 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
1939 }
1940
1941 sock_wfree(skb);
1942}
1943
40d4e3df
ED		 1944static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
1945 void *frame, struct net_device *dev, int size_max,
ae641949 1946 __be16 proto, unsigned char *addr, int hlen)
69e3c75f
JB		 1947{
1948 union {
1949 struct tpacket_hdr *h1;
1950 struct tpacket2_hdr *h2;
1951 void *raw;
1952 } ph;
1953 int to_write, offset, len, tp_len, nr_frags, len_max;
1954 struct socket *sock = po->sk.sk_socket;
1955 struct page *page;
1956 void *data;
1957 int err;
1958
1959 ph.raw = frame;
1960
1961 skb->protocol = proto;
1962 skb->dev = dev;
1963 skb->priority = po->sk.sk_priority;
2d37a186 1964 skb->mark = po->sk.sk_mark;
69e3c75f
JB		 1965 skb_shinfo(skb)->destructor_arg = ph.raw;
1966
1967 switch (po->tp_version) {
1968 case TPACKET_V2:
1969 tp_len = ph.h2->tp_len;
1970 break;
1971 default:
1972 tp_len = ph.h1->tp_len;
1973 break;
1974 }
1975 if (unlikely(tp_len > size_max)) {
40d4e3df 1976 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
69e3c75f
JB		 1977 return -EMSGSIZE;
1978 }
1979
ae641949 1980 skb_reserve(skb, hlen);
69e3c75f
JB		 1981 skb_reset_network_header(skb);
1982
1983 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
1984 to_write = tp_len;
1985
1986 if (sock->type == SOCK_DGRAM) {
1987 err = dev_hard_header(skb, dev, ntohs(proto), addr,
1988 NULL, tp_len);
1989 if (unlikely(err < 0))
1990 return -EINVAL;
40d4e3df 1991 } else if (dev->hard_header_len) {
69e3c75f
JB		 1992 /* net device doesn't like empty head */
1993 if (unlikely(tp_len <= dev->hard_header_len)) {
40d4e3df
ED		 1994 pr_err("packet size is too short (%d < %d)\n",
1995 tp_len, dev->hard_header_len);
69e3c75f
JB		 1996 return -EINVAL;
1997 }
1998
1999 skb_push(skb, dev->hard_header_len);
2000 err = skb_store_bits(skb, 0, data,
2001 dev->hard_header_len);
2002 if (unlikely(err))
2003 return err;
2004
2005 data += dev->hard_header_len;
2006 to_write -= dev->hard_header_len;
2007 }
2008
2009 err = -EFAULT;
69e3c75f
JB		 2010 offset = offset_in_page(data);
2011 len_max = PAGE_SIZE - offset;
2012 len = ((to_write > len_max) ? len_max : to_write);
2013
2014 skb->data_len = to_write;
2015 skb->len += to_write;
2016 skb->truesize += to_write;
2017 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2018
2019 while (likely(to_write)) {
2020 nr_frags = skb_shinfo(skb)->nr_frags;
2021
2022 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
40d4e3df
ED		 2023 pr_err("Packet exceed the number of skb frags(%lu)\n",
2024 MAX_SKB_FRAGS);
69e3c75f
JB		 2025 return -EFAULT;
2026 }
2027
0af55bb5
CG		 2028 page = pgv_to_page(data);
2029 data += len;
69e3c75f
JB		 2030 flush_dcache_page(page);
2031 get_page(page);
0af55bb5 2032 skb_fill_page_desc(skb, nr_frags, page, offset, len);
69e3c75f
JB		 2033 to_write -= len;
2034 offset = 0;
2035 len_max = PAGE_SIZE;
2036 len = ((to_write > len_max) ? len_max : to_write);
2037 }
2038
2039 return tp_len;
2040}
2041
2042static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2043{
69e3c75f
JB		 2044 struct sk_buff *skb;
2045 struct net_device *dev;
2046 __be16 proto;
827d9780
BG		 2047 bool need_rls_dev = false;
2048 int err, reserve = 0;
40d4e3df
ED		 2049 void *ph;
2050 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
69e3c75f
JB		 2051 int tp_len, size_max;
2052 unsigned char *addr;
2053 int len_sum = 0;
2054 int status = 0;
ae641949 2055 int hlen, tlen;
69e3c75f 2056
69e3c75f
JB		 2057 mutex_lock(&po->pg_vec_lock);
2058
2059 err = -EBUSY;
2060 if (saddr == NULL) {
827d9780 2061 dev = po->prot_hook.dev;
69e3c75f
JB		 2062 proto = po->num;
2063 addr = NULL;
2064 } else {
2065 err = -EINVAL;
2066 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2067 goto out;
2068 if (msg->msg_namelen < (saddr->sll_halen
2069 + offsetof(struct sockaddr_ll,
2070 sll_addr)))
2071 goto out;
69e3c75f
JB		 2072 proto = saddr->sll_protocol;
2073 addr = saddr->sll_addr;
827d9780
BG		 2074 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2075 need_rls_dev = true;
69e3c75f
JB		 2076 }
2077
69e3c75f
JB		 2078 err = -ENXIO;
2079 if (unlikely(dev == NULL))
2080 goto out;
2081
2082 reserve = dev->hard_header_len;
2083
2084 err = -ENETDOWN;
2085 if (unlikely(!(dev->flags & IFF_UP)))
2086 goto out_put;
2087
2088 size_max = po->tx_ring.frame_size
b5dd884e 2089 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
69e3c75f
JB		 2090
2091 if (size_max > dev->mtu + reserve)
2092 size_max = dev->mtu + reserve;
2093
2094 do {
2095 ph = packet_current_frame(po, &po->tx_ring,
2096 TP_STATUS_SEND_REQUEST);
2097
2098 if (unlikely(ph == NULL)) {
2099 schedule();
2100 continue;
2101 }
2102
2103 status = TP_STATUS_SEND_REQUEST;
ae641949
HX		 2104 hlen = LL_RESERVED_SPACE(dev);
2105 tlen = dev->needed_tailroom;
69e3c75f 2106 skb = sock_alloc_send_skb(&po->sk,
ae641949 2107 hlen + tlen + sizeof(struct sockaddr_ll),
69e3c75f
JB		 2108 0, &err);
2109
2110 if (unlikely(skb == NULL))
2111 goto out_status;
2112
2113 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
ae641949 2114 addr, hlen);
69e3c75f
JB		 2115
2116 if (unlikely(tp_len < 0)) {
2117 if (po->tp_loss) {
2118 __packet_set_status(po, ph,
2119 TP_STATUS_AVAILABLE);
2120 packet_increment_head(&po->tx_ring);
2121 kfree_skb(skb);
2122 continue;
2123 } else {
2124 status = TP_STATUS_WRONG_FORMAT;
2125 err = tp_len;
2126 goto out_status;
2127 }
2128 }
2129
2130 skb->destructor = tpacket_destruct_skb;
2131 __packet_set_status(po, ph, TP_STATUS_SENDING);
2132 atomic_inc(&po->tx_ring.pending);
2133
2134 status = TP_STATUS_SEND_REQUEST;
2135 err = dev_queue_xmit(skb);
eb70df13
JP		 2136 if (unlikely(err > 0)) {
2137 err = net_xmit_errno(err);
2138 if (err && __packet_get_status(po, ph) ==
2139 TP_STATUS_AVAILABLE) {
2140 /* skb was destructed already */
2141 skb = NULL;
2142 goto out_status;
2143 }
2144 /*
2145 * skb was dropped but not destructed yet;
2146 * let's treat it like congestion or err < 0
2147 */
2148 err = 0;
2149 }
69e3c75f
JB		 2150 packet_increment_head(&po->tx_ring);
2151 len_sum += tp_len;
f64f9e71
JP		 2152 } while (likely((ph != NULL) ||
2153 ((!(msg->msg_flags & MSG_DONTWAIT)) &&
2154 (atomic_read(&po->tx_ring.pending))))
2155 );
69e3c75f
JB		 2156
2157 err = len_sum;
2158 goto out_put;
2159
69e3c75f
JB		 2160out_status:
2161 __packet_set_status(po, ph, status);
2162 kfree_skb(skb);
2163out_put:
827d9780
BG		 2164 if (need_rls_dev)
2165 dev_put(dev);
69e3c75f
JB		 2166out:
2167 mutex_unlock(&po->pg_vec_lock);
2168 return err;
2169}
69e3c75f 2170
eea49cc9
OJ		 2171static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2172 size_t reserve, size_t len,
2173 size_t linear, int noblock,
2174 int *err)
bfd5f4a3
SS		 2175{
2176 struct sk_buff *skb;
2177
2178 /* Under a page? Don't bother with paged skb. */
2179 if (prepad + len < PAGE_SIZE || !linear)
2180 linear = len;
2181
2182 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2183 err);
2184 if (!skb)
2185 return NULL;
2186
2187 skb_reserve(skb, reserve);
2188 skb_put(skb, linear);
2189 skb->data_len = len - linear;
2190 skb->len += len - linear;
2191
2192 return skb;
2193}
2194
69e3c75f 2195static int packet_snd(struct socket *sock,
1da177e4
LT		 2196 struct msghdr *msg, size_t len)
2197{
2198 struct sock *sk = sock->sk;
40d4e3df 2199 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1da177e4
LT		 2200 struct sk_buff *skb;
2201 struct net_device *dev;
0e11c91e 2202 __be16 proto;
827d9780 2203 bool need_rls_dev = false;
1da177e4 2204 unsigned char *addr;
827d9780 2205 int err, reserve = 0;
bfd5f4a3
SS		 2206 struct virtio_net_hdr vnet_hdr = { 0 };
2207 int offset = 0;
2208 int vnet_hdr_len;
2209 struct packet_sock *po = pkt_sk(sk);
2210 unsigned short gso_type = 0;
ae641949 2211 int hlen, tlen;
1da177e4
LT		 2212
2213 /*
1ce4f28b 2214 * Get and verify the address.
1da177e4 2215 */
1ce4f28b 2216
1da177e4 2217 if (saddr == NULL) {
827d9780 2218 dev = po->prot_hook.dev;
1da177e4
LT		 2219 proto = po->num;
2220 addr = NULL;
2221 } else {
2222 err = -EINVAL;
2223 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2224 goto out;
0fb375fb
EB		 2225 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2226 goto out;
1da177e4
LT		 2227 proto = saddr->sll_protocol;
2228 addr = saddr->sll_addr;
827d9780
BG		 2229 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2230 need_rls_dev = true;
1da177e4
LT		 2231 }
2232
1da177e4
LT		 2233 err = -ENXIO;
2234 if (dev == NULL)
2235 goto out_unlock;
2236 if (sock->type == SOCK_RAW)
2237 reserve = dev->hard_header_len;
2238
d5e76b0a
DM		 2239 err = -ENETDOWN;
2240 if (!(dev->flags & IFF_UP))
2241 goto out_unlock;
2242
bfd5f4a3
SS		 2243 if (po->has_vnet_hdr) {
2244 vnet_hdr_len = sizeof(vnet_hdr);
2245
2246 err = -EINVAL;
2247 if (len < vnet_hdr_len)
2248 goto out_unlock;
2249
2250 len -= vnet_hdr_len;
2251
2252 err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
2253 vnet_hdr_len);
2254 if (err < 0)
2255 goto out_unlock;
2256
2257 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2258 (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
2259 vnet_hdr.hdr_len))
2260 vnet_hdr.hdr_len = vnet_hdr.csum_start +
2261 vnet_hdr.csum_offset + 2;
2262
2263 err = -EINVAL;
2264 if (vnet_hdr.hdr_len > len)
2265 goto out_unlock;
2266
2267 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2268 switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2269 case VIRTIO_NET_HDR_GSO_TCPV4:
2270 gso_type = SKB_GSO_TCPV4;
2271 break;
2272 case VIRTIO_NET_HDR_GSO_TCPV6:
2273 gso_type = SKB_GSO_TCPV6;
2274 break;
2275 case VIRTIO_NET_HDR_GSO_UDP:
2276 gso_type = SKB_GSO_UDP;
2277 break;
2278 default:
2279 goto out_unlock;
2280 }
2281
2282 if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
2283 gso_type |= SKB_GSO_TCP_ECN;
2284
2285 if (vnet_hdr.gso_size == 0)
2286 goto out_unlock;
2287
2288 }
2289 }
2290
1da177e4 2291 err = -EMSGSIZE;
57f89bfa 2292 if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
1da177e4
LT		 2293 goto out_unlock;
2294
bfd5f4a3 2295 err = -ENOBUFS;
ae641949
HX		 2296 hlen = LL_RESERVED_SPACE(dev);
2297 tlen = dev->needed_tailroom;
2298 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, vnet_hdr.hdr_len,
bfd5f4a3 2299 msg->msg_flags & MSG_DONTWAIT, &err);
40d4e3df 2300 if (skb == NULL)
1da177e4
LT		 2301 goto out_unlock;
2302
bfd5f4a3 2303 skb_set_network_header(skb, reserve);
1da177e4 2304
0c4e8581
SH		 2305 err = -EINVAL;
2306 if (sock->type == SOCK_DGRAM &&
bfd5f4a3 2307 (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
0c4e8581 2308 goto out_free;
1da177e4
LT		 2309
2310 /* Returns -EFAULT on error */
bfd5f4a3 2311 err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
1da177e4
LT		 2312 if (err)
2313 goto out_free;
2244d07b 2314 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
ed85b565
RC		 2315 if (err < 0)
2316 goto out_free;
1da177e4 2317
57f89bfa
BG		 2318 if (!gso_type && (len > dev->mtu + reserve)) {
2319 /* Earlier code assumed this would be a VLAN pkt,
2320 * double-check this now that we have the actual
2321 * packet in hand.
2322 */
2323 struct ethhdr *ehdr;
2324 skb_reset_mac_header(skb);
2325 ehdr = eth_hdr(skb);
2326 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
2327 err = -EMSGSIZE;
2328 goto out_free;
2329 }
2330 }
2331
1da177e4
LT		 2332 skb->protocol = proto;
2333 skb->dev = dev;
2334 skb->priority = sk->sk_priority;
2d37a186 2335 skb->mark = sk->sk_mark;
1da177e4 2336
bfd5f4a3
SS		 2337 if (po->has_vnet_hdr) {
2338 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2339 if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
2340 vnet_hdr.csum_offset)) {
2341 err = -EINVAL;
2342 goto out_free;
2343 }
2344 }
2345
2346 skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
2347 skb_shinfo(skb)->gso_type = gso_type;
2348
2349 /* Header must be checked, and gso_segs computed. */
2350 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2351 skb_shinfo(skb)->gso_segs = 0;
2352
2353 len += vnet_hdr_len;
2354 }
2355
1da177e4
LT		 2356 /*
2357 * Now send it
2358 */
2359
2360 err = dev_queue_xmit(skb);
2361 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2362 goto out_unlock;
2363
827d9780
BG		 2364 if (need_rls_dev)
2365 dev_put(dev);
1da177e4 2366
40d4e3df 2367 return len;
1da177e4
LT		 2368
2369out_free:
2370 kfree_skb(skb);
2371out_unlock:
827d9780 2372 if (dev && need_rls_dev)
1da177e4
LT		 2373 dev_put(dev);
2374out:
2375 return err;
2376}
2377
69e3c75f
JB		 2378static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
2379 struct msghdr *msg, size_t len)
2380{
69e3c75f
JB		 2381 struct sock *sk = sock->sk;
2382 struct packet_sock *po = pkt_sk(sk);
2383 if (po->tx_ring.pg_vec)
2384 return tpacket_snd(po, msg);
2385 else
69e3c75f
JB		 2386 return packet_snd(sock, msg, len);
2387}
2388
1da177e4
LT		 2389/*
2390 * Close a PACKET socket. This is fairly simple. We immediately go
2391 * to 'closed' state and remove our protocol entry in the device list.
2392 */
2393
2394static int packet_release(struct socket *sock)
2395{
2396 struct sock *sk = sock->sk;
2397 struct packet_sock *po;
d12d01d6 2398 struct net *net;
f6fb8f10 2399 union tpacket_req_u req_u;
1da177e4
LT		 2400
2401 if (!sk)
2402 return 0;
2403
3b1e0a65 2404 net = sock_net(sk);
1da177e4
LT		 2405 po = pkt_sk(sk);
2406
808f5114 2407 spin_lock_bh(&net->packet.sklist_lock);
2408 sk_del_node_init_rcu(sk);
920de804 2409 sock_prot_inuse_add(net, sk->sk_prot, -1);
808f5114 2410 spin_unlock_bh(&net->packet.sklist_lock);
1da177e4 2411
808f5114 2412 spin_lock(&po->bind_lock);
ce06b03e 2413 unregister_prot_hook(sk, false);
160ff18a
BG		 2414 if (po->prot_hook.dev) {
2415 dev_put(po->prot_hook.dev);
2416 po->prot_hook.dev = NULL;
2417 }
808f5114 2418 spin_unlock(&po->bind_lock);
1da177e4 2419
1da177e4 2420 packet_flush_mclist(sk);
1da177e4 2421
f6fb8f10 2422 memset(&req_u, 0, sizeof(req_u));
69e3c75f
JB		 2423
2424 if (po->rx_ring.pg_vec)
f6fb8f10 2425 packet_set_ring(sk, &req_u, 1, 0);
69e3c75f
JB		 2426
2427 if (po->tx_ring.pg_vec)
f6fb8f10 2428 packet_set_ring(sk, &req_u, 1, 1);
1da177e4 2429
dc99f600
DM		 2430 fanout_release(sk);
2431
808f5114 2432 synchronize_net();
1da177e4
LT		 2433 /*
2434 * Now the socket is dead. No more input will appear.
2435 */
1da177e4
LT		 2436 sock_orphan(sk);
2437 sock->sk = NULL;
2438
2439 /* Purge queues */
2440
2441 skb_queue_purge(&sk->sk_receive_queue);
17ab56a2 2442 sk_refcnt_debug_release(sk);
1da177e4
LT		 2443
2444 sock_put(sk);
2445 return 0;
2446}
2447
2448/*
2449 * Attach a packet hook.
2450 */
2451
0e11c91e 2452static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1da177e4
LT		 2453{
2454 struct packet_sock *po = pkt_sk(sk);
dc99f600 2455
aef950b4
WY		 2456 if (po->fanout) {
2457 if (dev)
2458 dev_put(dev);
2459
dc99f600 2460 return -EINVAL;
aef950b4 2461 }
1da177e4
LT		 2462
2463 lock_sock(sk);
2464
2465 spin_lock(&po->bind_lock);
ce06b03e 2466 unregister_prot_hook(sk, true);
1da177e4
LT		 2467 po->num = protocol;
2468 po->prot_hook.type = protocol;
160ff18a
BG		 2469 if (po->prot_hook.dev)
2470 dev_put(po->prot_hook.dev);
1da177e4
LT		 2471 po->prot_hook.dev = dev;
2472
2473 po->ifindex = dev ? dev->ifindex : 0;
2474
2475 if (protocol == 0)
2476 goto out_unlock;
2477
be85d4ad 2478 if (!dev || (dev->flags & IFF_UP)) {
ce06b03e 2479 register_prot_hook(sk);
be85d4ad
UT		 2480 } else {
2481 sk->sk_err = ENETDOWN;
2482 if (!sock_flag(sk, SOCK_DEAD))
2483 sk->sk_error_report(sk);
1da177e4
LT		 2484 }
2485
2486out_unlock:
2487 spin_unlock(&po->bind_lock);
2488 release_sock(sk);
2489 return 0;
2490}
2491
2492/*
2493 * Bind a packet socket to a device
2494 */
2495
40d4e3df
ED		 2496static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
2497 int addr_len)
1da177e4 2498{
40d4e3df 2499 struct sock *sk = sock->sk;
1da177e4
LT		 2500 char name[15];
2501 struct net_device *dev;
2502 int err = -ENODEV;
1ce4f28b 2503
1da177e4
LT		 2504 /*
2505 * Check legality
2506 */
1ce4f28b 2507
8ae55f04 2508 if (addr_len != sizeof(struct sockaddr))
1da177e4 2509 return -EINVAL;
40d4e3df 2510 strlcpy(name, uaddr->sa_data, sizeof(name));
1da177e4 2511
3b1e0a65 2512 dev = dev_get_by_name(sock_net(sk), name);
160ff18a 2513 if (dev)
1da177e4 2514 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1da177e4
LT		 2515 return err;
2516}
1da177e4
LT		 2517
2518static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
2519{
40d4e3df
ED		 2520 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
2521 struct sock *sk = sock->sk;
1da177e4
LT		 2522 struct net_device *dev = NULL;
2523 int err;
2524
2525
2526 /*
2527 * Check legality
2528 */
1ce4f28b 2529
1da177e4
LT		 2530 if (addr_len < sizeof(struct sockaddr_ll))
2531 return -EINVAL;
2532 if (sll->sll_family != AF_PACKET)
2533 return -EINVAL;
2534
2535 if (sll->sll_ifindex) {
2536 err = -ENODEV;
3b1e0a65 2537 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1da177e4
LT		 2538 if (dev == NULL)
2539 goto out;
2540 }
2541 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1da177e4
LT		 2542
2543out:
2544 return err;
2545}
2546
2547static struct proto packet_proto = {
2548 .name = "PACKET",
2549 .owner = THIS_MODULE,
2550 .obj_size = sizeof(struct packet_sock),
2551};
2552
2553/*
1ce4f28b 2554 * Create a packet of type SOCK_PACKET.
1da177e4
LT		 2555 */
2556
3f378b68
EP		 2557static int packet_create(struct net *net, struct socket *sock, int protocol,
2558 int kern)
1da177e4
LT		 2559{
2560 struct sock *sk;
2561 struct packet_sock *po;
0e11c91e 2562 __be16 proto = (__force __be16)protocol; /* weird, but documented */
1da177e4
LT		 2563 int err;
2564
2565 if (!capable(CAP_NET_RAW))
2566 return -EPERM;
be02097c
DM		 2567 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
2568 sock->type != SOCK_PACKET)
1da177e4
LT		 2569 return -ESOCKTNOSUPPORT;
2570
2571 sock->state = SS_UNCONNECTED;
2572
2573 err = -ENOBUFS;
6257ff21 2574 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1da177e4
LT		 2575 if (sk == NULL)
2576 goto out;
2577
2578 sock->ops = &packet_ops;
1da177e4
LT		 2579 if (sock->type == SOCK_PACKET)
2580 sock->ops = &packet_ops_spkt;
be02097c 2581
1da177e4
LT		 2582 sock_init_data(sock, sk);
2583
2584 po = pkt_sk(sk);
2585 sk->sk_family = PF_PACKET;
0e11c91e 2586 po->num = proto;
1da177e4
LT		 2587
2588 sk->sk_destruct = packet_sock_destruct;
17ab56a2 2589 sk_refcnt_debug_inc(sk);
1da177e4
LT		 2590
2591 /*
2592 * Attach a protocol block
2593 */
2594
2595 spin_lock_init(&po->bind_lock);
905db440 2596 mutex_init(&po->pg_vec_lock);
1da177e4 2597 po->prot_hook.func = packet_rcv;
be02097c 2598
1da177e4
LT		 2599 if (sock->type == SOCK_PACKET)
2600 po->prot_hook.func = packet_rcv_spkt;
be02097c 2601
1da177e4
LT		 2602 po->prot_hook.af_packet_priv = sk;
2603
0e11c91e
AV		 2604 if (proto) {
2605 po->prot_hook.type = proto;
ce06b03e 2606 register_prot_hook(sk);
1da177e4
LT		 2607 }
2608
808f5114 2609 spin_lock_bh(&net->packet.sklist_lock);
2610 sk_add_node_rcu(sk, &net->packet.sklist);
3680453c 2611 sock_prot_inuse_add(net, &packet_proto, 1);
808f5114 2612 spin_unlock_bh(&net->packet.sklist_lock);
2613
40d4e3df 2614 return 0;
1da177e4
LT		 2615out:
2616 return err;
2617}
2618
ed85b565
RC		 2619static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
2620{
2621 struct sock_exterr_skb *serr;
2622 struct sk_buff *skb, *skb2;
2623 int copied, err;
2624
2625 err = -EAGAIN;
2626 skb = skb_dequeue(&sk->sk_error_queue);
2627 if (skb == NULL)
2628 goto out;
2629
2630 copied = skb->len;
2631 if (copied > len) {
2632 msg->msg_flags |= MSG_TRUNC;
2633 copied = len;
2634 }
2635 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2636 if (err)
2637 goto out_free_skb;
2638
2639 sock_recv_timestamp(msg, sk, skb);
2640
2641 serr = SKB_EXT_ERR(skb);
2642 put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
2643 sizeof(serr->ee), &serr->ee);
2644
2645 msg->msg_flags |= MSG_ERRQUEUE;
2646 err = copied;
2647
2648 /* Reset and regenerate socket error */
2649 spin_lock_bh(&sk->sk_error_queue.lock);
2650 sk->sk_err = 0;
2651 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2652 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2653 spin_unlock_bh(&sk->sk_error_queue.lock);
2654 sk->sk_error_report(sk);
2655 } else
2656 spin_unlock_bh(&sk->sk_error_queue.lock);
2657
2658out_free_skb:
2659 kfree_skb(skb);
2660out:
2661 return err;
2662}
2663
1da177e4
LT		 2664/*
2665 * Pull a packet from our receive queue and hand it to the user.
2666 * If necessary we block.
2667 */
2668
2669static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
2670 struct msghdr *msg, size_t len, int flags)
2671{
2672 struct sock *sk = sock->sk;
2673 struct sk_buff *skb;
2674 int copied, err;
0fb375fb 2675 struct sockaddr_ll *sll;
bfd5f4a3 2676 int vnet_hdr_len = 0;
1da177e4
LT		 2677
2678 err = -EINVAL;
ed85b565 2679 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
1da177e4
LT		 2680 goto out;
2681
2682#if 0
2683 /* What error should we return now? EUNATTACH? */
2684 if (pkt_sk(sk)->ifindex < 0)
2685 return -ENODEV;
2686#endif
2687
ed85b565
RC		 2688 if (flags & MSG_ERRQUEUE) {
2689 err = packet_recv_error(sk, msg, len);
2690 goto out;
2691 }
2692
1da177e4
LT		 2693 /*
2694 * Call the generic datagram receiver. This handles all sorts
2695 * of horrible races and re-entrancy so we can forget about it
2696 * in the protocol layers.
2697 *
2698 * Now it will return ENETDOWN, if device have just gone down,
2699 * but then it will block.
2700 */
2701
40d4e3df 2702 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1da177e4
LT		 2703
2704 /*
1ce4f28b 2705 * An error occurred so return it. Because skb_recv_datagram()
1da177e4
LT		 2706 * handles the blocking we don't see and worry about blocking
2707 * retries.
2708 */
2709
8ae55f04 2710 if (skb == NULL)
1da177e4
LT		 2711 goto out;
2712
bfd5f4a3
SS		 2713 if (pkt_sk(sk)->has_vnet_hdr) {
2714 struct virtio_net_hdr vnet_hdr = { 0 };
2715
2716 err = -EINVAL;
2717 vnet_hdr_len = sizeof(vnet_hdr);
1f18b717 2718 if (len < vnet_hdr_len)
bfd5f4a3
SS		 2719 goto out_free;
2720
1f18b717
MK		 2721 len -= vnet_hdr_len;
2722
bfd5f4a3
SS		 2723 if (skb_is_gso(skb)) {
2724 struct skb_shared_info *sinfo = skb_shinfo(skb);
2725
2726 /* This is a hint as to how much should be linear. */
2727 vnet_hdr.hdr_len = skb_headlen(skb);
2728 vnet_hdr.gso_size = sinfo->gso_size;
2729 if (sinfo->gso_type & SKB_GSO_TCPV4)
2730 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
2731 else if (sinfo->gso_type & SKB_GSO_TCPV6)
2732 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
2733 else if (sinfo->gso_type & SKB_GSO_UDP)
2734 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
2735 else if (sinfo->gso_type & SKB_GSO_FCOE)
2736 goto out_free;
2737 else
2738 BUG();
2739 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
2740 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
2741 } else
2742 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
2743
2744 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2745 vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
55508d60 2746 vnet_hdr.csum_start = skb_checksum_start_offset(skb);
bfd5f4a3 2747 vnet_hdr.csum_offset = skb->csum_offset;
10a8d94a
JW		 2748 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
2749 vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
bfd5f4a3
SS		 2750 } /* else everything is zero */
2751
2752 err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
2753 vnet_hdr_len);
2754 if (err < 0)
2755 goto out_free;
2756 }
2757
0fb375fb
EB		 2758 /*
2759 * If the address length field is there to be filled in, we fill
2760 * it in now.
2761 */
2762
ffbc6111 2763 sll = &PACKET_SKB_CB(skb)->sa.ll;
0fb375fb
EB		 2764 if (sock->type == SOCK_PACKET)
2765 msg->msg_namelen = sizeof(struct sockaddr_pkt);
2766 else
2767 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
2768
1da177e4
LT		 2769 /*
2770 * You lose any data beyond the buffer you gave. If it worries a
2771 * user program they can ask the device for its MTU anyway.
2772 */
2773
2774 copied = skb->len;
40d4e3df
ED		 2775 if (copied > len) {
2776 copied = len;
2777 msg->msg_flags |= MSG_TRUNC;
1da177e4
LT		 2778 }
2779
2780 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2781 if (err)
2782 goto out_free;
2783
3b885787 2784 sock_recv_ts_and_drops(msg, sk, skb);
1da177e4
LT		 2785
2786 if (msg->msg_name)
ffbc6111
HX		 2787 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
2788 msg->msg_namelen);
1da177e4 2789
8dc41944 2790 if (pkt_sk(sk)->auxdata) {
ffbc6111
HX		 2791 struct tpacket_auxdata aux;
2792
2793 aux.tp_status = TP_STATUS_USER;
2794 if (skb->ip_summed == CHECKSUM_PARTIAL)
2795 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
2796 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
2797 aux.tp_snaplen = skb->len;
2798 aux.tp_mac = 0;
bbe735e4 2799 aux.tp_net = skb_network_offset(skb);
a3bcc23e
BG		 2800 if (vlan_tx_tag_present(skb)) {
2801 aux.tp_vlan_tci = vlan_tx_tag_get(skb);
2802 aux.tp_status |= TP_STATUS_VLAN_VALID;
2803 } else {
2804 aux.tp_vlan_tci = 0;
2805 }
13fcb7bd 2806 aux.tp_padding = 0;
ffbc6111 2807 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
8dc41944
HX		 2808 }
2809
1da177e4
LT		 2810 /*
2811 * Free or return the buffer as appropriate. Again this
2812 * hides all the races and re-entrancy issues from us.
2813 */
bfd5f4a3 2814 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
1da177e4
LT		 2815
2816out_free:
2817 skb_free_datagram(sk, skb);
2818out:
2819 return err;
2820}
2821
1da177e4
LT		 2822static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
2823 int *uaddr_len, int peer)
2824{
2825 struct net_device *dev;
2826 struct sock *sk = sock->sk;
2827
2828 if (peer)
2829 return -EOPNOTSUPP;
2830
2831 uaddr->sa_family = AF_PACKET;
654d1f8a
ED		 2832 rcu_read_lock();
2833 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
2834 if (dev)
67286640 2835 strncpy(uaddr->sa_data, dev->name, 14);
654d1f8a 2836 else
1da177e4 2837 memset(uaddr->sa_data, 0, 14);
654d1f8a 2838 rcu_read_unlock();
1da177e4
LT		 2839 *uaddr_len = sizeof(*uaddr);
2840
2841 return 0;
2842}
1da177e4
LT		 2843
2844static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
2845 int *uaddr_len, int peer)
2846{
2847 struct net_device *dev;
2848 struct sock *sk = sock->sk;
2849 struct packet_sock *po = pkt_sk(sk);
13cfa97b 2850 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
1da177e4
LT		 2851
2852 if (peer)
2853 return -EOPNOTSUPP;
2854
2855 sll->sll_family = AF_PACKET;
2856 sll->sll_ifindex = po->ifindex;
2857 sll->sll_protocol = po->num;
67286640 2858 sll->sll_pkttype = 0;
654d1f8a
ED		 2859 rcu_read_lock();
2860 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
1da177e4
LT		 2861 if (dev) {
2862 sll->sll_hatype = dev->type;
2863 sll->sll_halen = dev->addr_len;
2864 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1da177e4
LT		 2865 } else {
2866 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
2867 sll->sll_halen = 0;
2868 }
654d1f8a 2869 rcu_read_unlock();
0fb375fb 2870 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1da177e4
LT		 2871
2872 return 0;
2873}
2874
2aeb0b88
WC		 2875static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
2876 int what)
1da177e4
LT		 2877{
2878 switch (i->type) {
2879 case PACKET_MR_MULTICAST:
1162563f
JP		 2880 if (i->alen != dev->addr_len)
2881 return -EINVAL;
1da177e4 2882 if (what > 0)
22bedad3 2883 return dev_mc_add(dev, i->addr);
1da177e4 2884 else
22bedad3 2885 return dev_mc_del(dev, i->addr);
1da177e4
LT		 2886 break;
2887 case PACKET_MR_PROMISC:
2aeb0b88 2888 return dev_set_promiscuity(dev, what);
1da177e4
LT		 2889 break;
2890 case PACKET_MR_ALLMULTI:
2aeb0b88 2891 return dev_set_allmulti(dev, what);
1da177e4 2892 break;
d95ed927 2893 case PACKET_MR_UNICAST:
1162563f
JP		 2894 if (i->alen != dev->addr_len)
2895 return -EINVAL;
d95ed927 2896 if (what > 0)
a748ee24 2897 return dev_uc_add(dev, i->addr);
d95ed927 2898 else
a748ee24 2899 return dev_uc_del(dev, i->addr);
d95ed927 2900 break;
40d4e3df
ED		 2901 default:
2902 break;
1da177e4 2903 }
2aeb0b88 2904 return 0;
1da177e4
LT		 2905}
2906
2907static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
2908{
40d4e3df 2909 for ( ; i; i = i->next) {
1da177e4
LT		 2910 if (i->ifindex == dev->ifindex)
2911 packet_dev_mc(dev, i, what);
2912 }
2913}
2914
0fb375fb 2915static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1da177e4
LT		 2916{
2917 struct packet_sock *po = pkt_sk(sk);
2918 struct packet_mclist *ml, *i;
2919 struct net_device *dev;
2920 int err;
2921
2922 rtnl_lock();
2923
2924 err = -ENODEV;
3b1e0a65 2925 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1da177e4
LT		 2926 if (!dev)
2927 goto done;
2928
2929 err = -EINVAL;
1162563f 2930 if (mreq->mr_alen > dev->addr_len)
1da177e4
LT		 2931 goto done;
2932
2933 err = -ENOBUFS;
8b3a7005 2934 i = kmalloc(sizeof(*i), GFP_KERNEL);
1da177e4
LT		 2935 if (i == NULL)
2936 goto done;
2937
2938 err = 0;
2939 for (ml = po->mclist; ml; ml = ml->next) {
2940 if (ml->ifindex == mreq->mr_ifindex &&
2941 ml->type == mreq->mr_type &&
2942 ml->alen == mreq->mr_alen &&
2943 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
2944 ml->count++;
2945 /* Free the new element ... */
2946 kfree(i);
2947 goto done;
2948 }
2949 }
2950
2951 i->type = mreq->mr_type;
2952 i->ifindex = mreq->mr_ifindex;
2953 i->alen = mreq->mr_alen;
2954 memcpy(i->addr, mreq->mr_address, i->alen);
2955 i->count = 1;
2956 i->next = po->mclist;
2957 po->mclist = i;
2aeb0b88
WC		 2958 err = packet_dev_mc(dev, i, 1);
2959 if (err) {
2960 po->mclist = i->next;
2961 kfree(i);
2962 }
1da177e4
LT		 2963
2964done:
2965 rtnl_unlock();
2966 return err;
2967}
2968
0fb375fb 2969static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1da177e4
LT		 2970{
2971 struct packet_mclist *ml, **mlp;
2972
2973 rtnl_lock();
2974
2975 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
2976 if (ml->ifindex == mreq->mr_ifindex &&
2977 ml->type == mreq->mr_type &&
2978 ml->alen == mreq->mr_alen &&
2979 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
2980 if (--ml->count == 0) {
2981 struct net_device *dev;
2982 *mlp = ml->next;
ad959e76
ED		 2983 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
2984 if (dev)
1da177e4 2985 packet_dev_mc(dev, ml, -1);
1da177e4
LT		 2986 kfree(ml);
2987 }
2988 rtnl_unlock();
2989 return 0;
2990 }
2991 }
2992 rtnl_unlock();
2993 return -EADDRNOTAVAIL;
2994}
2995
2996static void packet_flush_mclist(struct sock *sk)
2997{
2998 struct packet_sock *po = pkt_sk(sk);
2999 struct packet_mclist *ml;
3000
3001 if (!po->mclist)
3002 return;
3003
3004 rtnl_lock();
3005 while ((ml = po->mclist) != NULL) {
3006 struct net_device *dev;
3007
3008 po->mclist = ml->next;
ad959e76
ED		 3009 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3010 if (dev != NULL)
1da177e4 3011 packet_dev_mc(dev, ml, -1);
1da177e4
LT		 3012 kfree(ml);
3013 }
3014 rtnl_unlock();
3015}
1da177e4
LT		 3016
3017static int
b7058842 3018packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 3019{
3020 struct sock *sk = sock->sk;
8dc41944 3021 struct packet_sock *po = pkt_sk(sk);
1da177e4
LT		 3022 int ret;
3023
3024 if (level != SOL_PACKET)
3025 return -ENOPROTOOPT;
3026
69e3c75f 3027 switch (optname) {
1ce4f28b 3028 case PACKET_ADD_MEMBERSHIP:
1da177e4
LT		 3029 case PACKET_DROP_MEMBERSHIP:
3030 {
0fb375fb
EB		 3031 struct packet_mreq_max mreq;
3032 int len = optlen;
3033 memset(&mreq, 0, sizeof(mreq));
3034 if (len < sizeof(struct packet_mreq))
1da177e4 3035 return -EINVAL;
0fb375fb
EB		 3036 if (len > sizeof(mreq))
3037 len = sizeof(mreq);
40d4e3df 3038 if (copy_from_user(&mreq, optval, len))
1da177e4 3039 return -EFAULT;
0fb375fb
EB		 3040 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3041 return -EINVAL;
1da177e4
LT		 3042 if (optname == PACKET_ADD_MEMBERSHIP)
3043 ret = packet_mc_add(sk, &mreq);
3044 else
3045 ret = packet_mc_drop(sk, &mreq);
3046 return ret;
3047 }
a2efcfa0 3048
1da177e4 3049 case PACKET_RX_RING:
69e3c75f 3050 case PACKET_TX_RING:
1da177e4 3051 {
f6fb8f10 3052 union tpacket_req_u req_u;
3053 int len;
1da177e4 3054
f6fb8f10 3055 switch (po->tp_version) {
3056 case TPACKET_V1:
3057 case TPACKET_V2:
3058 len = sizeof(req_u.req);
3059 break;
3060 case TPACKET_V3:
3061 default:
3062 len = sizeof(req_u.req3);
3063 break;
3064 }
3065 if (optlen < len)
1da177e4 3066 return -EINVAL;
bfd5f4a3
SS		 3067 if (pkt_sk(sk)->has_vnet_hdr)
3068 return -EINVAL;
f6fb8f10 3069 if (copy_from_user(&req_u.req, optval, len))
1da177e4 3070 return -EFAULT;
f6fb8f10 3071 return packet_set_ring(sk, &req_u, 0,
3072 optname == PACKET_TX_RING);
1da177e4
LT		 3073 }
3074 case PACKET_COPY_THRESH:
3075 {
3076 int val;
3077
40d4e3df 3078 if (optlen != sizeof(val))
1da177e4 3079 return -EINVAL;
40d4e3df 3080 if (copy_from_user(&val, optval, sizeof(val)))
1da177e4
LT		 3081 return -EFAULT;
3082
3083 pkt_sk(sk)->copy_thresh = val;
3084 return 0;
3085 }
bbd6ef87
PM		 3086 case PACKET_VERSION:
3087 {
3088 int val;
3089
3090 if (optlen != sizeof(val))
3091 return -EINVAL;
69e3c75f 3092 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
bbd6ef87
PM		 3093 return -EBUSY;
3094 if (copy_from_user(&val, optval, sizeof(val)))
3095 return -EFAULT;
3096 switch (val) {
3097 case TPACKET_V1:
3098 case TPACKET_V2:
f6fb8f10 3099 case TPACKET_V3:
bbd6ef87
PM		 3100 po->tp_version = val;
3101 return 0;
3102 default:
3103 return -EINVAL;
3104 }
3105 }
8913336a
PM		 3106 case PACKET_RESERVE:
3107 {
3108 unsigned int val;
3109
3110 if (optlen != sizeof(val))
3111 return -EINVAL;
69e3c75f 3112 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
8913336a
PM		 3113 return -EBUSY;
3114 if (copy_from_user(&val, optval, sizeof(val)))
3115 return -EFAULT;
3116 po->tp_reserve = val;
3117 return 0;
3118 }
69e3c75f
JB		 3119 case PACKET_LOSS:
3120 {
3121 unsigned int val;
3122
3123 if (optlen != sizeof(val))
3124 return -EINVAL;
3125 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3126 return -EBUSY;
3127 if (copy_from_user(&val, optval, sizeof(val)))
3128 return -EFAULT;
3129 po->tp_loss = !!val;
3130 return 0;
3131 }
8dc41944
HX		 3132 case PACKET_AUXDATA:
3133 {
3134 int val;
3135
3136 if (optlen < sizeof(val))
3137 return -EINVAL;
3138 if (copy_from_user(&val, optval, sizeof(val)))
3139 return -EFAULT;
3140
3141 po->auxdata = !!val;
3142 return 0;
3143 }
80feaacb
PWJ		 3144 case PACKET_ORIGDEV:
3145 {
3146 int val;
3147
3148 if (optlen < sizeof(val))
3149 return -EINVAL;
3150 if (copy_from_user(&val, optval, sizeof(val)))
3151 return -EFAULT;
3152
3153 po->origdev = !!val;
3154 return 0;
3155 }
bfd5f4a3
SS		 3156 case PACKET_VNET_HDR:
3157 {
3158 int val;
3159
3160 if (sock->type != SOCK_RAW)
3161 return -EINVAL;
3162 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3163 return -EBUSY;
3164 if (optlen < sizeof(val))
3165 return -EINVAL;
3166 if (copy_from_user(&val, optval, sizeof(val)))
3167 return -EFAULT;
3168
3169 po->has_vnet_hdr = !!val;
3170 return 0;
3171 }
614f60fa
SM		 3172 case PACKET_TIMESTAMP:
3173 {
3174 int val;
3175
3176 if (optlen != sizeof(val))
3177 return -EINVAL;
3178 if (copy_from_user(&val, optval, sizeof(val)))
3179 return -EFAULT;
3180
3181 po->tp_tstamp = val;
3182 return 0;
3183 }
dc99f600
DM		 3184 case PACKET_FANOUT:
3185 {
3186 int val;
3187
3188 if (optlen != sizeof(val))
3189 return -EINVAL;
3190 if (copy_from_user(&val, optval, sizeof(val)))
3191 return -EFAULT;
3192
3193 return fanout_add(sk, val & 0xffff, val >> 16);
3194 }
1da177e4
LT		 3195 default:
3196 return -ENOPROTOOPT;
3197 }
3198}
3199
3200static int packet_getsockopt(struct socket *sock, int level, int optname,
3201 char __user *optval, int __user *optlen)
3202{
3203 int len;
8dc41944 3204 int val;
1da177e4
LT		 3205 struct sock *sk = sock->sk;
3206 struct packet_sock *po = pkt_sk(sk);
8dc41944
HX		 3207 void *data;
3208 struct tpacket_stats st;
f6fb8f10 3209 union tpacket_stats_u st_u;
1da177e4
LT		 3210
3211 if (level != SOL_PACKET)
3212 return -ENOPROTOOPT;
3213
8ae55f04
KK		 3214 if (get_user(len, optlen))
3215 return -EFAULT;
1da177e4
LT		 3216
3217 if (len < 0)
3218 return -EINVAL;
1ce4f28b 3219
69e3c75f 3220 switch (optname) {
1da177e4 3221 case PACKET_STATISTICS:
f6fb8f10 3222 if (po->tp_version == TPACKET_V3) {
3223 len = sizeof(struct tpacket_stats_v3);
3224 } else {
3225 if (len > sizeof(struct tpacket_stats))
3226 len = sizeof(struct tpacket_stats);
3227 }
1da177e4 3228 spin_lock_bh(&sk->sk_receive_queue.lock);
f6fb8f10 3229 if (po->tp_version == TPACKET_V3) {
3230 memcpy(&st_u.stats3, &po->stats,
3231 sizeof(struct tpacket_stats));
3232 st_u.stats3.tp_freeze_q_cnt =
3233 po->stats_u.stats3.tp_freeze_q_cnt;
3234 st_u.stats3.tp_packets += po->stats.tp_drops;
3235 data = &st_u.stats3;
3236 } else {
3237 st = po->stats;
3238 st.tp_packets += st.tp_drops;
3239 data = &st;
3240 }
1da177e4
LT		 3241 memset(&po->stats, 0, sizeof(st));
3242 spin_unlock_bh(&sk->sk_receive_queue.lock);
8dc41944
HX		 3243 break;
3244 case PACKET_AUXDATA:
3245 if (len > sizeof(int))
3246 len = sizeof(int);
3247 val = po->auxdata;
3248
80feaacb
PWJ		 3249 data = &val;
3250 break;
3251 case PACKET_ORIGDEV:
3252 if (len > sizeof(int))
3253 len = sizeof(int);
3254 val = po->origdev;
3255
bfd5f4a3
SS		 3256 data = &val;
3257 break;
3258 case PACKET_VNET_HDR:
3259 if (len > sizeof(int))
3260 len = sizeof(int);
3261 val = po->has_vnet_hdr;
3262
8dc41944 3263 data = &val;
1da177e4 3264 break;
bbd6ef87
PM		 3265 case PACKET_VERSION:
3266 if (len > sizeof(int))
3267 len = sizeof(int);
3268 val = po->tp_version;
3269 data = &val;
3270 break;
3271 case PACKET_HDRLEN:
3272 if (len > sizeof(int))
3273 len = sizeof(int);
3274 if (copy_from_user(&val, optval, len))
3275 return -EFAULT;
3276 switch (val) {
3277 case TPACKET_V1:
3278 val = sizeof(struct tpacket_hdr);
3279 break;
3280 case TPACKET_V2:
3281 val = sizeof(struct tpacket2_hdr);
3282 break;
f6fb8f10 3283 case TPACKET_V3:
3284 val = sizeof(struct tpacket3_hdr);
3285 break;
bbd6ef87
PM		 3286 default:
3287 return -EINVAL;
3288 }
3289 data = &val;
3290 break;
8913336a
PM		 3291 case PACKET_RESERVE:
3292 if (len > sizeof(unsigned int))
3293 len = sizeof(unsigned int);
3294 val = po->tp_reserve;
3295 data = &val;
3296 break;
69e3c75f
JB		 3297 case PACKET_LOSS:
3298 if (len > sizeof(unsigned int))
3299 len = sizeof(unsigned int);
3300 val = po->tp_loss;
3301 data = &val;
3302 break;
614f60fa
SM		 3303 case PACKET_TIMESTAMP:
3304 if (len > sizeof(int))
3305 len = sizeof(int);
3306 val = po->tp_tstamp;
3307 data = &val;
3308 break;
dc99f600
DM		 3309 case PACKET_FANOUT:
3310 if (len > sizeof(int))
3311 len = sizeof(int);
3312 val = (po->fanout ?
3313 ((u32)po->fanout->id |
3314 ((u32)po->fanout->type << 16)) :
3315 0);
3316 data = &val;
3317 break;
1da177e4
LT		 3318 default:
3319 return -ENOPROTOOPT;
3320 }
3321
8ae55f04
KK		 3322 if (put_user(len, optlen))
3323 return -EFAULT;
8dc41944
HX		 3324 if (copy_to_user(optval, data, len))
3325 return -EFAULT;
8ae55f04 3326 return 0;
1da177e4
LT		 3327}
3328
3329
3330static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
3331{
3332 struct sock *sk;
3333 struct hlist_node *node;
ad930650 3334 struct net_device *dev = data;
c346dca1 3335 struct net *net = dev_net(dev);
1da177e4 3336
808f5114 3337 rcu_read_lock();
3338 sk_for_each_rcu(sk, node, &net->packet.sklist) {
1da177e4
LT		 3339 struct packet_sock *po = pkt_sk(sk);
3340
3341 switch (msg) {
3342 case NETDEV_UNREGISTER:
1da177e4
LT		 3343 if (po->mclist)
3344 packet_dev_mclist(dev, po->mclist, -1);
a2efcfa0
DM		 3345 /* fallthrough */
3346
1da177e4
LT		 3347 case NETDEV_DOWN:
3348 if (dev->ifindex == po->ifindex) {
3349 spin_lock(&po->bind_lock);
3350 if (po->running) {
ce06b03e 3351 __unregister_prot_hook(sk, false);
1da177e4
LT		 3352 sk->sk_err = ENETDOWN;
3353 if (!sock_flag(sk, SOCK_DEAD))
3354 sk->sk_error_report(sk);
3355 }
3356 if (msg == NETDEV_UNREGISTER) {
3357 po->ifindex = -1;
160ff18a
BG		 3358 if (po->prot_hook.dev)
3359 dev_put(po->prot_hook.dev);
1da177e4
LT		 3360 po->prot_hook.dev = NULL;
3361 }
3362 spin_unlock(&po->bind_lock);
3363 }
3364 break;
3365 case NETDEV_UP:
808f5114 3366 if (dev->ifindex == po->ifindex) {
3367 spin_lock(&po->bind_lock);
ce06b03e
DM		 3368 if (po->num)
3369 register_prot_hook(sk);
808f5114 3370 spin_unlock(&po->bind_lock);
1da177e4 3371 }
1da177e4
LT		 3372 break;
3373 }
3374 }
808f5114 3375 rcu_read_unlock();
1da177e4
LT		 3376 return NOTIFY_DONE;
3377}
3378
3379
3380static int packet_ioctl(struct socket *sock, unsigned int cmd,
3381 unsigned long arg)
3382{
3383 struct sock *sk = sock->sk;
3384
69e3c75f 3385 switch (cmd) {
40d4e3df
ED		 3386 case SIOCOUTQ:
3387 {
3388 int amount = sk_wmem_alloc_get(sk);
31e6d363 3389
40d4e3df
ED		 3390 return put_user(amount, (int __user *)arg);
3391 }
3392 case SIOCINQ:
3393 {
3394 struct sk_buff *skb;
3395 int amount = 0;
3396
3397 spin_lock_bh(&sk->sk_receive_queue.lock);
3398 skb = skb_peek(&sk->sk_receive_queue);
3399 if (skb)
3400 amount = skb->len;
3401 spin_unlock_bh(&sk->sk_receive_queue.lock);
3402 return put_user(amount, (int __user *)arg);
3403 }
3404 case SIOCGSTAMP:
3405 return sock_get_timestamp(sk, (struct timeval __user *)arg);
3406 case SIOCGSTAMPNS:
3407 return sock_get_timestampns(sk, (struct timespec __user *)arg);
1ce4f28b 3408
1da177e4 3409#ifdef CONFIG_INET
40d4e3df
ED		 3410 case SIOCADDRT:
3411 case SIOCDELRT:
3412 case SIOCDARP:
3413 case SIOCGARP:
3414 case SIOCSARP:
3415 case SIOCGIFADDR:
3416 case SIOCSIFADDR:
3417 case SIOCGIFBRDADDR:
3418 case SIOCSIFBRDADDR:
3419 case SIOCGIFNETMASK:
3420 case SIOCSIFNETMASK:
3421 case SIOCGIFDSTADDR:
3422 case SIOCSIFDSTADDR:
3423 case SIOCSIFFLAGS:
40d4e3df 3424 return inet_dgram_ops.ioctl(sock, cmd, arg);
1da177e4
LT		 3425#endif
3426
40d4e3df
ED		 3427 default:
3428 return -ENOIOCTLCMD;
1da177e4
LT		 3429 }
3430 return 0;
3431}
3432
40d4e3df 3433static unsigned int packet_poll(struct file *file, struct socket *sock,
1da177e4
LT		 3434 poll_table *wait)
3435{
3436 struct sock *sk = sock->sk;
3437 struct packet_sock *po = pkt_sk(sk);
3438 unsigned int mask = datagram_poll(file, sock, wait);
3439
3440 spin_lock_bh(&sk->sk_receive_queue.lock);
69e3c75f 3441 if (po->rx_ring.pg_vec) {
f6fb8f10 3442 if (!packet_previous_rx_frame(po, &po->rx_ring,
3443 TP_STATUS_KERNEL))
1da177e4
LT		 3444 mask |= POLLIN | POLLRDNORM;
3445 }
3446 spin_unlock_bh(&sk->sk_receive_queue.lock);
69e3c75f
JB		 3447 spin_lock_bh(&sk->sk_write_queue.lock);
3448 if (po->tx_ring.pg_vec) {
3449 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
3450 mask |= POLLOUT | POLLWRNORM;
3451 }
3452 spin_unlock_bh(&sk->sk_write_queue.lock);
1da177e4
LT		 3453 return mask;
3454}
3455
3456
3457/* Dirty? Well, I still did not learn better way to account
3458 * for user mmaps.
3459 */
3460
3461static void packet_mm_open(struct vm_area_struct *vma)
3462{
3463 struct file *file = vma->vm_file;
40d4e3df 3464 struct socket *sock = file->private_data;
1da177e4 3465 struct sock *sk = sock->sk;
1ce4f28b 3466
1da177e4
LT		 3467 if (sk)
3468 atomic_inc(&pkt_sk(sk)->mapped);
3469}
3470
3471static void packet_mm_close(struct vm_area_struct *vma)
3472{
3473 struct file *file = vma->vm_file;
40d4e3df 3474 struct socket *sock = file->private_data;
1da177e4 3475 struct sock *sk = sock->sk;
1ce4f28b 3476
1da177e4
LT		 3477 if (sk)
3478 atomic_dec(&pkt_sk(sk)->mapped);
3479}
3480
f0f37e2f 3481static const struct vm_operations_struct packet_mmap_ops = {
40d4e3df
ED		 3482 .open = packet_mm_open,
3483 .close = packet_mm_close,
1da177e4
LT		 3484};
3485
0e3125c7
NH		 3486static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
3487 unsigned int len)
1da177e4
LT		 3488{
3489 int i;
3490
4ebf0ae2 3491 for (i = 0; i < len; i++) {
0e3125c7 3492 if (likely(pg_vec[i].buffer)) {
c56b4d90 3493 if (is_vmalloc_addr(pg_vec[i].buffer))
0e3125c7
NH		 3494 vfree(pg_vec[i].buffer);
3495 else
3496 free_pages((unsigned long)pg_vec[i].buffer,
3497 order);
3498 pg_vec[i].buffer = NULL;
3499 }
1da177e4
LT		 3500 }
3501 kfree(pg_vec);
3502}
3503
eea49cc9 3504static char *alloc_one_pg_vec_page(unsigned long order)
4ebf0ae2 3505{
0e3125c7
NH		 3506 char *buffer = NULL;
3507 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
3508 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
3509
3510 buffer = (char *) __get_free_pages(gfp_flags, order);
3511
3512 if (buffer)
3513 return buffer;
3514
3515 /*
3516 * __get_free_pages failed, fall back to vmalloc
3517 */
bbce5a59 3518 buffer = vzalloc((1 << order) * PAGE_SIZE);
719bfeaa 3519
0e3125c7
NH		 3520 if (buffer)
3521 return buffer;
3522
3523 /*
3524 * vmalloc failed, lets dig into swap here
3525 */
0e3125c7
NH		 3526 gfp_flags &= ~__GFP_NORETRY;
3527 buffer = (char *)__get_free_pages(gfp_flags, order);
3528 if (buffer)
3529 return buffer;
3530
3531 /*
3532 * complete and utter failure
3533 */
3534 return NULL;
4ebf0ae2
DM		 3535}
3536
0e3125c7 3537static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4ebf0ae2
DM		 3538{
3539 unsigned int block_nr = req->tp_block_nr;
0e3125c7 3540 struct pgv *pg_vec;
4ebf0ae2
DM		 3541 int i;
3542
0e3125c7 3543 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4ebf0ae2
DM		 3544 if (unlikely(!pg_vec))
3545 goto out;
3546
3547 for (i = 0; i < block_nr; i++) {
c56b4d90 3548 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
0e3125c7 3549 if (unlikely(!pg_vec[i].buffer))
4ebf0ae2
DM		 3550 goto out_free_pgvec;
3551 }
3552
3553out:
3554 return pg_vec;
3555
3556out_free_pgvec:
3557 free_pg_vec(pg_vec, order, block_nr);
3558 pg_vec = NULL;
3559 goto out;
3560}
1da177e4 3561
f6fb8f10 3562static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
69e3c75f 3563 int closing, int tx_ring)
1da177e4 3564{
0e3125c7 3565 struct pgv *pg_vec = NULL;
1da177e4 3566 struct packet_sock *po = pkt_sk(sk);
0e11c91e 3567 int was_running, order = 0;
69e3c75f
JB		 3568 struct packet_ring_buffer *rb;
3569 struct sk_buff_head *rb_queue;
0e11c91e 3570 __be16 num;
f6fb8f10 3571 int err = -EINVAL;
3572 /* Added to avoid minimal code churn */
3573 struct tpacket_req *req = &req_u->req;
3574
3575 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
3576 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
3577 WARN(1, "Tx-ring is not supported.\n");
3578 goto out;
3579 }
1ce4f28b 3580
69e3c75f
JB		 3581 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
3582 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
1da177e4 3583
69e3c75f
JB		 3584 err = -EBUSY;
3585 if (!closing) {
3586 if (atomic_read(&po->mapped))
3587 goto out;
3588 if (atomic_read(&rb->pending))
3589 goto out;
3590 }
1da177e4 3591
69e3c75f
JB		 3592 if (req->tp_block_nr) {
3593 /* Sanity tests and some calculations */
3594 err = -EBUSY;
3595 if (unlikely(rb->pg_vec))
3596 goto out;
1da177e4 3597
bbd6ef87
PM		 3598 switch (po->tp_version) {
3599 case TPACKET_V1:
3600 po->tp_hdrlen = TPACKET_HDRLEN;
3601 break;
3602 case TPACKET_V2:
3603 po->tp_hdrlen = TPACKET2_HDRLEN;
3604 break;
f6fb8f10 3605 case TPACKET_V3:
3606 po->tp_hdrlen = TPACKET3_HDRLEN;
3607 break;
bbd6ef87
PM		 3608 }
3609
69e3c75f 3610 err = -EINVAL;
4ebf0ae2 3611 if (unlikely((int)req->tp_block_size <= 0))
69e3c75f 3612 goto out;
4ebf0ae2 3613 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
69e3c75f 3614 goto out;
8913336a 3615 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
69e3c75f
JB		 3616 po->tp_reserve))
3617 goto out;
4ebf0ae2 3618 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
69e3c75f 3619 goto out;
1da177e4 3620
69e3c75f
JB		 3621 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
3622 if (unlikely(rb->frames_per_block <= 0))
3623 goto out;
3624 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
3625 req->tp_frame_nr))
3626 goto out;
1da177e4
LT		 3627
3628 err = -ENOMEM;
4ebf0ae2
DM		 3629 order = get_order(req->tp_block_size);
3630 pg_vec = alloc_pg_vec(req, order);
3631 if (unlikely(!pg_vec))
1da177e4 3632 goto out;
f6fb8f10 3633 switch (po->tp_version) {
3634 case TPACKET_V3:
3635 /* Transmit path is not supported. We checked
3636 * it above but just being paranoid
3637 */
3638 if (!tx_ring)
3639 init_prb_bdqc(po, rb, pg_vec, req_u, tx_ring);
3640 break;
3641 default:
3642 break;
3643 }
69e3c75f
JB		 3644 }
3645 /* Done */
3646 else {
3647 err = -EINVAL;
4ebf0ae2 3648 if (unlikely(req->tp_frame_nr))
69e3c75f 3649 goto out;
1da177e4
LT		 3650 }
3651
3652 lock_sock(sk);
3653
3654 /* Detach socket from network */
3655 spin_lock(&po->bind_lock);
3656 was_running = po->running;
3657 num = po->num;
3658 if (was_running) {
1da177e4 3659 po->num = 0;
ce06b03e 3660 __unregister_prot_hook(sk, false);
1da177e4
LT		 3661 }
3662 spin_unlock(&po->bind_lock);
1ce4f28b 3663
1da177e4
LT		 3664 synchronize_net();
3665
3666 err = -EBUSY;
905db440 3667 mutex_lock(&po->pg_vec_lock);
1da177e4
LT		 3668 if (closing || atomic_read(&po->mapped) == 0) {
3669 err = 0;
69e3c75f 3670 spin_lock_bh(&rb_queue->lock);
c053fd96 3671 swap(rb->pg_vec, pg_vec);
69e3c75f
JB		 3672 rb->frame_max = (req->tp_frame_nr - 1);
3673 rb->head = 0;
3674 rb->frame_size = req->tp_frame_size;
3675 spin_unlock_bh(&rb_queue->lock);
3676
c053fd96
CG		 3677 swap(rb->pg_vec_order, order);
3678 swap(rb->pg_vec_len, req->tp_block_nr);
69e3c75f
JB		 3679
3680 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
3681 po->prot_hook.func = (po->rx_ring.pg_vec) ?
3682 tpacket_rcv : packet_rcv;
3683 skb_queue_purge(rb_queue);
1da177e4 3684 if (atomic_read(&po->mapped))
40d4e3df
ED		 3685 pr_err("packet_mmap: vma is busy: %d\n",
3686 atomic_read(&po->mapped));
1da177e4 3687 }
905db440 3688 mutex_unlock(&po->pg_vec_lock);
1da177e4
LT		 3689
3690 spin_lock(&po->bind_lock);
ce06b03e 3691 if (was_running) {
1da177e4 3692 po->num = num;
ce06b03e 3693 register_prot_hook(sk);
1da177e4
LT		 3694 }
3695 spin_unlock(&po->bind_lock);
f6fb8f10 3696 if (closing && (po->tp_version > TPACKET_V2)) {
3697 /* Because we don't support block-based V3 on tx-ring */
3698 if (!tx_ring)
3699 prb_shutdown_retire_blk_timer(po, tx_ring, rb_queue);
3700 }
1da177e4
LT		 3701 release_sock(sk);
3702
1da177e4
LT		 3703 if (pg_vec)
3704 free_pg_vec(pg_vec, order, req->tp_block_nr);
3705out:
3706 return err;
3707}
3708
69e3c75f
JB		 3709static int packet_mmap(struct file *file, struct socket *sock,
3710 struct vm_area_struct *vma)
1da177e4
LT		 3711{
3712 struct sock *sk = sock->sk;
3713 struct packet_sock *po = pkt_sk(sk);
69e3c75f
JB		 3714 unsigned long size, expected_size;
3715 struct packet_ring_buffer *rb;
1da177e4
LT		 3716 unsigned long start;
3717 int err = -EINVAL;
3718 int i;
3719
3720 if (vma->vm_pgoff)
3721 return -EINVAL;
3722
905db440 3723 mutex_lock(&po->pg_vec_lock);
69e3c75f
JB		 3724
3725 expected_size = 0;
3726 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
3727 if (rb->pg_vec) {
3728 expected_size += rb->pg_vec_len
3729 * rb->pg_vec_pages
3730 * PAGE_SIZE;
3731 }
3732 }
3733
3734 if (expected_size == 0)
1da177e4 3735 goto out;
69e3c75f
JB		 3736
3737 size = vma->vm_end - vma->vm_start;
3738 if (size != expected_size)
1da177e4
LT		 3739 goto out;
3740
1da177e4 3741 start = vma->vm_start;
69e3c75f
JB		 3742 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
3743 if (rb->pg_vec == NULL)
3744 continue;
3745
3746 for (i = 0; i < rb->pg_vec_len; i++) {
0e3125c7
NH		 3747 struct page *page;
3748 void *kaddr = rb->pg_vec[i].buffer;
69e3c75f
JB		 3749 int pg_num;
3750
c56b4d90
CG		 3751 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
3752 page = pgv_to_page(kaddr);
69e3c75f
JB		 3753 err = vm_insert_page(vma, start, page);
3754 if (unlikely(err))
3755 goto out;
3756 start += PAGE_SIZE;
0e3125c7 3757 kaddr += PAGE_SIZE;
69e3c75f 3758 }
4ebf0ae2 3759 }
1da177e4 3760 }
69e3c75f 3761
4ebf0ae2 3762 atomic_inc(&po->mapped);
1da177e4
LT		 3763 vma->vm_ops = &packet_mmap_ops;
3764 err = 0;
3765
3766out:
905db440 3767 mutex_unlock(&po->pg_vec_lock);
1da177e4
LT		 3768 return err;
3769}
1da177e4 3770
90ddc4f0 3771static const struct proto_ops packet_ops_spkt = {
1da177e4
LT		 3772 .family = PF_PACKET,
3773 .owner = THIS_MODULE,
3774 .release = packet_release,
3775 .bind = packet_bind_spkt,
3776 .connect = sock_no_connect,
3777 .socketpair = sock_no_socketpair,
3778 .accept = sock_no_accept,
3779 .getname = packet_getname_spkt,
3780 .poll = datagram_poll,
3781 .ioctl = packet_ioctl,
3782 .listen = sock_no_listen,
3783 .shutdown = sock_no_shutdown,
3784 .setsockopt = sock_no_setsockopt,
3785 .getsockopt = sock_no_getsockopt,
3786 .sendmsg = packet_sendmsg_spkt,
3787 .recvmsg = packet_recvmsg,
3788 .mmap = sock_no_mmap,
3789 .sendpage = sock_no_sendpage,
3790};
1da177e4 3791
90ddc4f0 3792static const struct proto_ops packet_ops = {
1da177e4
LT		 3793 .family = PF_PACKET,
3794 .owner = THIS_MODULE,
3795 .release = packet_release,
3796 .bind = packet_bind,
3797 .connect = sock_no_connect,
3798 .socketpair = sock_no_socketpair,
3799 .accept = sock_no_accept,
1ce4f28b 3800 .getname = packet_getname,
1da177e4
LT		 3801 .poll = packet_poll,
3802 .ioctl = packet_ioctl,
3803 .listen = sock_no_listen,
3804 .shutdown = sock_no_shutdown,
3805 .setsockopt = packet_setsockopt,
3806 .getsockopt = packet_getsockopt,
3807 .sendmsg = packet_sendmsg,
3808 .recvmsg = packet_recvmsg,
3809 .mmap = packet_mmap,
3810 .sendpage = sock_no_sendpage,
3811};
3812
ec1b4cf7 3813static const struct net_proto_family packet_family_ops = {
1da177e4
LT		 3814 .family = PF_PACKET,
3815 .create = packet_create,
3816 .owner = THIS_MODULE,
3817};
3818
3819static struct notifier_block packet_netdev_notifier = {
40d4e3df 3820 .notifier_call = packet_notifier,
1da177e4
LT		 3821};
3822
3823#ifdef CONFIG_PROC_FS
1da177e4
LT		 3824
3825static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
808f5114 3826 __acquires(RCU)
1da177e4 3827{
e372c414 3828 struct net *net = seq_file_net(seq);
808f5114 3829
3830 rcu_read_lock();
3831 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
1da177e4
LT		 3832}
3833
3834static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3835{
1bf40954 3836 struct net *net = seq_file_net(seq);
808f5114 3837 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
1da177e4
LT		 3838}
3839
3840static void packet_seq_stop(struct seq_file *seq, void *v)
808f5114 3841 __releases(RCU)
1da177e4 3842{
808f5114 3843 rcu_read_unlock();
1da177e4
LT		 3844}
3845
1ce4f28b 3846static int packet_seq_show(struct seq_file *seq, void *v)
1da177e4
LT		 3847{
3848 if (v == SEQ_START_TOKEN)
3849 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
3850 else {
b7ceabd9 3851 struct sock *s = sk_entry(v);
1da177e4
LT		 3852 const struct packet_sock *po = pkt_sk(s);
3853
3854 seq_printf(seq,
71338aa7 3855 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
1da177e4
LT		 3856 s,
3857 atomic_read(&s->sk_refcnt),
3858 s->sk_type,
3859 ntohs(po->num),
3860 po->ifindex,
3861 po->running,
3862 atomic_read(&s->sk_rmem_alloc),
3863 sock_i_uid(s),
40d4e3df 3864 sock_i_ino(s));
1da177e4
LT		 3865 }
3866
3867 return 0;
3868}
3869
56b3d975 3870static const struct seq_operations packet_seq_ops = {
1da177e4
LT		 3871 .start = packet_seq_start,
3872 .next = packet_seq_next,
3873 .stop = packet_seq_stop,
3874 .show = packet_seq_show,
3875};
3876
3877static int packet_seq_open(struct inode *inode, struct file *file)
3878{
e372c414
DL		 3879 return seq_open_net(inode, file, &packet_seq_ops,
3880 sizeof(struct seq_net_private));
1da177e4
LT		 3881}
3882
da7071d7 3883static const struct file_operations packet_seq_fops = {
1da177e4
LT		 3884 .owner = THIS_MODULE,
3885 .open = packet_seq_open,
3886 .read = seq_read,
3887 .llseek = seq_lseek,
e372c414 3888 .release = seq_release_net,
1da177e4
LT		 3889};
3890
3891#endif
3892
2c8c1e72 3893static int __net_init packet_net_init(struct net *net)
d12d01d6 3894{
808f5114 3895 spin_lock_init(&net->packet.sklist_lock);
2aaef4e4 3896 INIT_HLIST_HEAD(&net->packet.sklist);
d12d01d6
DL		 3897
3898 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
3899 return -ENOMEM;
3900
3901 return 0;
3902}
3903
2c8c1e72 3904static void __net_exit packet_net_exit(struct net *net)
d12d01d6
DL		 3905{
3906 proc_net_remove(net, "packet");
3907}
3908
3909static struct pernet_operations packet_net_ops = {
3910 .init = packet_net_init,
3911 .exit = packet_net_exit,
3912};
3913
3914
1da177e4
LT		 3915static void __exit packet_exit(void)
3916{
1da177e4 3917 unregister_netdevice_notifier(&packet_netdev_notifier);
d12d01d6 3918 unregister_pernet_subsys(&packet_net_ops);
1da177e4
LT		 3919 sock_unregister(PF_PACKET);
3920 proto_unregister(&packet_proto);
3921}
3922
3923static int __init packet_init(void)
3924{
3925 int rc = proto_register(&packet_proto, 0);
3926
3927 if (rc != 0)
3928 goto out;
3929
3930 sock_register(&packet_family_ops);
d12d01d6 3931 register_pernet_subsys(&packet_net_ops);
1da177e4 3932 register_netdevice_notifier(&packet_netdev_notifier);
1da177e4
LT		 3933out:
3934 return rc;
3935}
3936
3937module_init(packet_init);
3938module_exit(packet_exit);
3939MODULE_LICENSE("GPL");
3940MODULE_ALIAS_NETPROTO(PF_PACKET);
Linux kernel - Deliverables
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