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.
6 * PACKET - implements raw packet sockets.
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
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.
35 * Ulises Alonso : Frame number limit removal and
36 * packet_set_ring memory leak.
37 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
40 * byte arrays at the end of sockaddr_ll
42 * Johann Baudy : Added TX RING.
43 * Chetan Loke : Implemented TPACKET_V3 block abstraction
45 * Copyright (C) 2011, <lokec@ccs.neu.edu>
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.
55 #include <linux/types.h>
57 #include <linux/capability.h>
58 #include <linux/fcntl.h>
59 #include <linux/socket.h>
61 #include <linux/inet.h>
62 #include <linux/netdevice.h>
63 #include <linux/if_packet.h>
64 #include <linux/wireless.h>
65 #include <linux/kernel.h>
66 #include <linux/kmod.h>
67 #include <linux/slab.h>
68 #include <linux/vmalloc.h>
69 #include <net/net_namespace.h>
71 #include <net/protocol.h>
72 #include <linux/skbuff.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>
80 #include <asm/cacheflush.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>
87 #include <linux/mutex.h>
88 #include <linux/if_vlan.h>
89 #include <linux/virtio_net.h>
90 #include <linux/errqueue.h>
91 #include <linux/net_tstamp.h>
94 #include <net/inet_common.h>
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
105 - packet socket receives packets with pulled ll header,
106 so that SOCK_RAW should push it back.
111 Incoming, dev->hard_header!=NULL
112 mac_header -> ll header
115 Outgoing, dev->hard_header!=NULL
116 mac_header -> ll header
119 Incoming, dev->hard_header==NULL
120 mac_header -> UNKNOWN position. It is very likely, that it points to ll
121 header. PPP makes it, that is wrong, because introduce
122 assymetry between rx and tx paths.
125 Outgoing, dev->hard_header==NULL
126 mac_header -> data. ll header is still not built!
130 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
136 dev->hard_header != NULL
137 mac_header -> ll header
140 dev->hard_header == NULL (ll header is added by device, we cannot control it)
144 We should set nh.raw on output to correct posistion,
145 packet classifier depends on it.
148 /* Private packet socket structures. */
150 struct packet_mclist {
151 struct packet_mclist *next;
156 unsigned char addr[MAX_ADDR_LEN];
158 /* identical to struct packet_mreq except it has
159 * a longer address field.
161 struct packet_mreq_max {
163 unsigned short mr_type;
164 unsigned short mr_alen;
165 unsigned char mr_address[MAX_ADDR_LEN];
168 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
169 int closing, int tx_ring);
172 #define V3_ALIGNMENT (8)
174 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
176 #define BLK_PLUS_PRIV(sz_of_priv) \
177 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
179 /* kbdq - kernel block descriptor queue */
180 struct tpacket_kbdq_core {
182 unsigned int feature_req_word;
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;
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.
193 unsigned short last_kactive_blk_num;
198 unsigned int knum_blocks;
199 uint64_t knxt_seq_num;
204 atomic_t blk_fill_in_prog;
206 /* Default is set to 8ms */
207 #define DEFAULT_PRB_RETIRE_TOV (8)
209 unsigned short retire_blk_tov;
210 unsigned short version;
211 unsigned long tov_in_jiffies;
213 /* timer to retire an outstanding block */
214 struct timer_list retire_blk_timer;
217 #define PGV_FROM_VMALLOC 1
222 struct packet_ring_buffer {
225 unsigned int frames_per_block;
226 unsigned int frame_size;
227 unsigned int frame_max;
229 unsigned int pg_vec_order;
230 unsigned int pg_vec_pages;
231 unsigned int pg_vec_len;
233 struct tpacket_kbdq_core prb_bdqc;
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)))
246 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
248 static void *packet_previous_frame(struct packet_sock *po,
249 struct packet_ring_buffer *rb,
251 static void packet_increment_head(struct packet_ring_buffer *buff);
252 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
253 struct tpacket_block_desc *);
254 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
255 struct packet_sock *);
256 static void prb_retire_current_block(struct tpacket_kbdq_core *,
257 struct packet_sock *, unsigned int status);
258 static int prb_queue_frozen(struct tpacket_kbdq_core *);
259 static void prb_open_block(struct tpacket_kbdq_core *,
260 struct tpacket_block_desc *);
261 static void prb_retire_rx_blk_timer_expired(unsigned long);
262 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
263 static void prb_init_blk_timer(struct packet_sock *,
264 struct tpacket_kbdq_core *,
265 void (*func) (unsigned long));
266 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
267 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
268 struct tpacket3_hdr *);
269 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
270 struct tpacket3_hdr *);
271 static void packet_flush_mclist(struct sock *sk);
273 struct packet_fanout;
275 /* struct sock has to be the first member of packet_sock */
277 struct packet_fanout *fanout;
278 struct tpacket_stats stats;
279 union tpacket_stats_u stats_u;
280 struct packet_ring_buffer rx_ring;
281 struct packet_ring_buffer tx_ring;
283 spinlock_t bind_lock;
284 struct mutex pg_vec_lock;
285 unsigned int running:1, /* prot_hook is attached*/
289 int ifindex; /* bound device */
291 struct packet_mclist *mclist;
293 enum tpacket_versions tp_version;
294 unsigned int tp_hdrlen;
295 unsigned int tp_reserve;
296 unsigned int tp_loss:1;
297 unsigned int tp_tstamp;
298 struct packet_type prot_hook ____cacheline_aligned_in_smp;
301 #define PACKET_FANOUT_MAX 256
303 struct packet_fanout {
307 unsigned int num_members;
312 struct list_head list;
313 struct sock *arr[PACKET_FANOUT_MAX];
316 struct packet_type prot_hook ____cacheline_aligned_in_smp;
319 struct packet_skb_cb {
320 unsigned int origlen;
322 struct sockaddr_pkt pkt;
323 struct sockaddr_ll ll;
327 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
329 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
330 #define GET_PBLOCK_DESC(x, bid) \
331 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
332 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
333 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
334 #define GET_NEXT_PRB_BLK_NUM(x) \
335 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
336 ((x)->kactive_blk_num+1) : 0)
338 static struct packet_sock *pkt_sk(struct sock *sk)
340 return (struct packet_sock *)sk;
343 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
344 static void __fanout_link(struct sock *sk, struct packet_sock *po);
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()).
350 static void register_prot_hook(struct sock *sk)
352 struct packet_sock *po = pkt_sk(sk);
355 __fanout_link(sk, po);
357 dev_add_pack(&po->prot_hook);
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.
370 static void __unregister_prot_hook(struct sock *sk, bool sync)
372 struct packet_sock *po = pkt_sk(sk);
376 __fanout_unlink(sk, po);
378 __dev_remove_pack(&po->prot_hook);
382 spin_unlock(&po->bind_lock);
384 spin_lock(&po->bind_lock);
388 static void unregister_prot_hook(struct sock *sk, bool sync)
390 struct packet_sock *po = pkt_sk(sk);
393 __unregister_prot_hook(sk, sync);
396 static inline __pure struct page *pgv_to_page(void *addr)
398 if (is_vmalloc_addr(addr))
399 return vmalloc_to_page(addr);
400 return virt_to_page(addr);
403 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
406 struct tpacket_hdr *h1;
407 struct tpacket2_hdr *h2;
412 switch (po->tp_version) {
414 h.h1->tp_status = status;
415 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
418 h.h2->tp_status = status;
419 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
423 WARN(1, "TPACKET version not supported.\n");
430 static int __packet_get_status(struct packet_sock *po, void *frame)
433 struct tpacket_hdr *h1;
434 struct tpacket2_hdr *h2;
441 switch (po->tp_version) {
443 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
444 return h.h1->tp_status;
446 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
447 return h.h2->tp_status;
450 WARN(1, "TPACKET version not supported.\n");
456 static void *packet_lookup_frame(struct packet_sock *po,
457 struct packet_ring_buffer *rb,
458 unsigned int position,
461 unsigned int pg_vec_pos, frame_offset;
463 struct tpacket_hdr *h1;
464 struct tpacket2_hdr *h2;
468 pg_vec_pos = position / rb->frames_per_block;
469 frame_offset = position % rb->frames_per_block;
471 h.raw = rb->pg_vec[pg_vec_pos].buffer +
472 (frame_offset * rb->frame_size);
474 if (status != __packet_get_status(po, h.raw))
480 static void *packet_current_frame(struct packet_sock *po,
481 struct packet_ring_buffer *rb,
484 return packet_lookup_frame(po, rb, rb->head, status);
487 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
489 del_timer_sync(&pkc->retire_blk_timer);
492 static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
494 struct sk_buff_head *rb_queue)
496 struct tpacket_kbdq_core *pkc;
498 pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
500 spin_lock(&rb_queue->lock);
501 pkc->delete_blk_timer = 1;
502 spin_unlock(&rb_queue->lock);
504 prb_del_retire_blk_timer(pkc);
507 static void prb_init_blk_timer(struct packet_sock *po,
508 struct tpacket_kbdq_core *pkc,
509 void (*func) (unsigned long))
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;
517 static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring)
519 struct tpacket_kbdq_core *pkc;
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);
528 static int prb_calc_retire_blk_tmo(struct packet_sock *po,
529 int blk_size_in_bytes)
531 struct net_device *dev;
532 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
533 struct ethtool_cmd ecmd;
537 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
538 if (unlikely(!dev)) {
540 return DEFAULT_PRB_RETIRE_TOV;
542 err = __ethtool_get_settings(dev, &ecmd);
545 switch (ecmd.speed) {
555 * If the link speed is so slow you don't really
556 * need to worry about perf anyways
561 return DEFAULT_PRB_RETIRE_TOV;
565 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
577 static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
578 union tpacket_req_u *req_u)
580 p1->feature_req_word = req_u->req3.tp_feature_req_word;
583 static void init_prb_bdqc(struct packet_sock *po,
584 struct packet_ring_buffer *rb,
586 union tpacket_req_u *req_u, int tx_ring)
588 struct tpacket_kbdq_core *p1 = &rb->prb_bdqc;
589 struct tpacket_block_desc *pbd;
591 memset(p1, 0x0, sizeof(*p1));
593 p1->knxt_seq_num = 1;
595 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
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;
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;
611 prb_init_ft_ops(p1, req_u);
612 prb_setup_retire_blk_timer(po, tx_ring);
613 prb_open_block(p1, pbd);
616 /* Do NOT update the last_blk_num first.
617 * Assumes sk_buff_head lock is held.
619 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
621 mod_timer(&pkc->retire_blk_timer,
622 jiffies + pkc->tov_in_jiffies);
623 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
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.
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.
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.
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.
649 static void prb_retire_rx_blk_timer_expired(unsigned long data)
651 struct packet_sock *po = (struct packet_sock *)data;
652 struct tpacket_kbdq_core *pkc = &po->rx_ring.prb_bdqc;
654 struct tpacket_block_desc *pbd;
656 spin_lock(&po->sk.sk_receive_queue.lock);
658 frozen = prb_queue_frozen(pkc);
659 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
661 if (unlikely(pkc->delete_blk_timer))
664 /* We only need to plug the race when the block is partially filled.
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
673 if (BLOCK_NUM_PKTS(pbd)) {
674 while (atomic_read(&pkc->blk_fill_in_prog)) {
675 /* Waiting for skb_copy_bits to finish... */
680 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
682 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
683 if (!prb_dispatch_next_block(pkc, po))
688 /* Case 1. Queue was frozen because user-space was
691 if (prb_curr_blk_in_use(pkc, pbd)) {
693 * Ok, user-space is still behind.
694 * So just refresh the timer.
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.
705 prb_open_block(pkc, pbd);
712 _prb_refresh_rx_retire_blk_timer(pkc);
715 spin_unlock(&po->sk.sk_receive_queue.lock);
718 static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
719 struct tpacket_block_desc *pbd1, __u32 status)
721 /* Flush everything minus the block header */
723 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
728 /* Skip the block header(we know header WILL fit in 4K) */
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));
738 /* Now update the block status. */
740 BLOCK_STATUS(pbd1) = status;
742 /* Flush the block header */
744 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
746 flush_dcache_page(pgv_to_page(start));
756 * 2) Increment active_blk_num
758 * Note:We DONT refresh the timer on purpose.
759 * Because almost always the next block will be opened.
761 static void prb_close_block(struct tpacket_kbdq_core *pkc1,
762 struct tpacket_block_desc *pbd1,
763 struct packet_sock *po, unsigned int stat)
765 __u32 status = TP_STATUS_USER | stat;
767 struct tpacket3_hdr *last_pkt;
768 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
770 if (po->stats.tp_drops)
771 status |= TP_STATUS_LOSING;
773 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
774 last_pkt->tp_next_offset = 0;
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;
781 /* Ok, we tmo'd - so get the current time */
784 h1->ts_last_pkt.ts_sec = ts.tv_sec;
785 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
790 /* Flush the block */
791 prb_flush_block(pkc1, pbd1, status);
793 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
796 static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
798 pkc->reset_pending_on_curr_blk = 0;
802 * Side effect of opening a block:
804 * 1) prb_queue is thawed.
805 * 2) retire_blk_timer is refreshed.
808 static void prb_open_block(struct tpacket_kbdq_core *pkc1,
809 struct tpacket_block_desc *pbd1)
812 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
816 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd1))) {
818 /* We could have just memset this but we will lose the
819 * flexibility of making the priv area sticky
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);
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);
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);
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'.
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.
872 static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
873 struct packet_sock *po)
875 pkc->reset_pending_on_curr_blk = 1;
876 po->stats_u.stats3.tp_freeze_q_cnt++;
879 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
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.
887 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
888 struct packet_sock *po)
890 struct tpacket_block_desc *pbd;
894 /* 1. Get current block num */
895 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
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);
905 * open this block and return the offset where the first packet
906 * needs to get stored.
908 prb_open_block(pkc, pbd);
909 return (void *)pkc->nxt_offset;
912 static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
913 struct packet_sock *po, unsigned int status)
915 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
917 /* retire/close the current block */
918 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
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()
925 * We don't need to worry about the TMO case because
926 * the timer-handler already handled this case.
928 if (!(status & TP_STATUS_BLK_TMO)) {
929 while (atomic_read(&pkc->blk_fill_in_prog)) {
930 /* Waiting for skb_copy_bits to finish... */
934 prb_close_block(pkc, pbd, po, status);
938 WARN(1, "ERROR-pbd[%d]:%p\n", pkc->kactive_blk_num, pbd);
943 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
944 struct tpacket_block_desc *pbd)
946 return TP_STATUS_USER & BLOCK_STATUS(pbd);
949 static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
951 return pkc->reset_pending_on_curr_blk;
954 static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
956 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
957 atomic_dec(&pkc->blk_fill_in_prog);
960 static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
961 struct tpacket3_hdr *ppd)
963 ppd->hv1.tp_rxhash = skb_get_rxhash(pkc->skb);
966 static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
967 struct tpacket3_hdr *ppd)
969 ppd->hv1.tp_rxhash = 0;
972 static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
973 struct tpacket3_hdr *ppd)
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;
979 ppd->hv1.tp_vlan_tci = ppd->tp_status = 0;
983 static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
984 struct tpacket3_hdr *ppd)
986 prb_fill_vlan_info(pkc, ppd);
988 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
989 prb_fill_rxhash(pkc, ppd);
991 prb_clear_rxhash(pkc, ppd);
994 static void prb_fill_curr_block(char *curr,
995 struct tpacket_kbdq_core *pkc,
996 struct tpacket_block_desc *pbd,
999 struct tpacket3_hdr *ppd;
1001 ppd = (struct tpacket3_hdr *)curr;
1002 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
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);
1011 /* Assumes caller has the sk->rx_queue.lock */
1012 static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1013 struct sk_buff *skb,
1018 struct tpacket_kbdq_core *pkc;
1019 struct tpacket_block_desc *pbd;
1022 pkc = GET_PBDQC_FROM_RB(((struct packet_ring_buffer *)&po->rx_ring));
1023 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1025 /* Queue is frozen when user space is lagging behind */
1026 if (prb_queue_frozen(pkc)) {
1028 * Check if that last block which caused the queue to freeze,
1029 * is still in_use by user-space.
1031 if (prb_curr_blk_in_use(pkc, pbd)) {
1032 /* Can't record this packet */
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.
1041 prb_open_block(pkc, pbd);
1046 curr = pkc->nxt_offset;
1048 end = (char *) ((char *)pbd + pkc->kblk_size);
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;
1056 /* Ok, close the current block */
1057 prb_retire_current_block(pkc, po, 0);
1059 /* Now, try to dispatch the next block */
1060 curr = (char *)prb_dispatch_next_block(pkc, po);
1062 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1063 prb_fill_curr_block(curr, pkc, pbd, len);
1064 return (void *)curr;
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.
1074 static void *packet_current_rx_frame(struct packet_sock *po,
1075 struct sk_buff *skb,
1076 int status, unsigned int len)
1079 switch (po->tp_version) {
1082 curr = packet_lookup_frame(po, &po->rx_ring,
1083 po->rx_ring.head, status);
1086 return __packet_lookup_frame_in_block(po, skb, status, len);
1088 WARN(1, "TPACKET version not supported\n");
1094 static void *prb_lookup_block(struct packet_sock *po,
1095 struct packet_ring_buffer *rb,
1096 unsigned int previous,
1099 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1100 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, previous);
1102 if (status != BLOCK_STATUS(pbd))
1107 static int prb_previous_blk_num(struct packet_ring_buffer *rb)
1110 if (rb->prb_bdqc.kactive_blk_num)
1111 prev = rb->prb_bdqc.kactive_blk_num-1;
1113 prev = rb->prb_bdqc.knum_blocks-1;
1117 /* Assumes caller has held the rx_queue.lock */
1118 static void *__prb_previous_block(struct packet_sock *po,
1119 struct packet_ring_buffer *rb,
1122 unsigned int previous = prb_previous_blk_num(rb);
1123 return prb_lookup_block(po, rb, previous, status);
1126 static void *packet_previous_rx_frame(struct packet_sock *po,
1127 struct packet_ring_buffer *rb,
1130 if (po->tp_version <= TPACKET_V2)
1131 return packet_previous_frame(po, rb, status);
1133 return __prb_previous_block(po, rb, status);
1136 static void packet_increment_rx_head(struct packet_sock *po,
1137 struct packet_ring_buffer *rb)
1139 switch (po->tp_version) {
1142 return packet_increment_head(rb);
1145 WARN(1, "TPACKET version not supported.\n");
1151 static void *packet_previous_frame(struct packet_sock *po,
1152 struct packet_ring_buffer *rb,
1155 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1156 return packet_lookup_frame(po, rb, previous, status);
1159 static void packet_increment_head(struct packet_ring_buffer *buff)
1161 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1164 static void packet_sock_destruct(struct sock *sk)
1166 skb_queue_purge(&sk->sk_error_queue);
1168 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1169 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1171 if (!sock_flag(sk, SOCK_DEAD)) {
1172 pr_err("Attempt to release alive packet socket: %p\n", sk);
1176 sk_refcnt_debug_dec(sk);
1179 static int fanout_rr_next(struct packet_fanout *f, unsigned int num)
1181 int x = atomic_read(&f->rr_cur) + 1;
1189 static struct sock *fanout_demux_hash(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1191 u32 idx, hash = skb->rxhash;
1193 idx = ((u64)hash * num) >> 32;
1198 static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1202 cur = atomic_read(&f->rr_cur);
1203 while ((old = atomic_cmpxchg(&f->rr_cur, cur,
1204 fanout_rr_next(f, num))) != cur)
1209 static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
1211 unsigned int cpu = smp_processor_id();
1213 return f->arr[cpu % num];
1216 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1217 struct packet_type *pt, struct net_device *orig_dev)
1219 struct packet_fanout *f = pt->af_packet_priv;
1220 unsigned int num = f->num_members;
1221 struct packet_sock *po;
1224 if (!net_eq(dev_net(dev), read_pnet(&f->net)) ||
1231 case PACKET_FANOUT_HASH:
1234 skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET);
1238 skb_get_rxhash(skb);
1239 sk = fanout_demux_hash(f, skb, num);
1241 case PACKET_FANOUT_LB:
1242 sk = fanout_demux_lb(f, skb, num);
1244 case PACKET_FANOUT_CPU:
1245 sk = fanout_demux_cpu(f, skb, num);
1251 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1254 static DEFINE_MUTEX(fanout_mutex);
1255 static LIST_HEAD(fanout_list);
1257 static void __fanout_link(struct sock *sk, struct packet_sock *po)
1259 struct packet_fanout *f = po->fanout;
1261 spin_lock(&f->lock);
1262 f->arr[f->num_members] = sk;
1265 spin_unlock(&f->lock);
1268 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1270 struct packet_fanout *f = po->fanout;
1273 spin_lock(&f->lock);
1274 for (i = 0; i < f->num_members; i++) {
1275 if (f->arr[i] == sk)
1278 BUG_ON(i >= f->num_members);
1279 f->arr[i] = f->arr[f->num_members - 1];
1281 spin_unlock(&f->lock);
1284 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
1286 struct packet_sock *po = pkt_sk(sk);
1287 struct packet_fanout *f, *match;
1288 u8 type = type_flags & 0xff;
1289 u8 defrag = (type_flags & PACKET_FANOUT_FLAG_DEFRAG) ? 1 : 0;
1293 case PACKET_FANOUT_HASH:
1294 case PACKET_FANOUT_LB:
1295 case PACKET_FANOUT_CPU:
1307 mutex_lock(&fanout_mutex);
1309 list_for_each_entry(f, &fanout_list, list) {
1311 read_pnet(&f->net) == sock_net(sk)) {
1317 if (match && match->defrag != defrag)
1321 match = kzalloc(sizeof(*match), GFP_KERNEL);
1324 write_pnet(&match->net, sock_net(sk));
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);
1340 if (match->type == type &&
1341 match->prot_hook.type == po->prot_hook.type &&
1342 match->prot_hook.dev == po->prot_hook.dev) {
1344 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1345 __dev_remove_pack(&po->prot_hook);
1347 atomic_inc(&match->sk_ref);
1348 __fanout_link(sk, po);
1353 mutex_unlock(&fanout_mutex);
1357 static void fanout_release(struct sock *sk)
1359 struct packet_sock *po = pkt_sk(sk);
1360 struct packet_fanout *f;
1368 mutex_lock(&fanout_mutex);
1369 if (atomic_dec_and_test(&f->sk_ref)) {
1371 dev_remove_pack(&f->prot_hook);
1374 mutex_unlock(&fanout_mutex);
1377 static const struct proto_ops packet_ops;
1379 static const struct proto_ops packet_ops_spkt;
1381 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1382 struct packet_type *pt, struct net_device *orig_dev)
1385 struct sockaddr_pkt *spkt;
1388 * When we registered the protocol we saved the socket in the data
1389 * field for just this event.
1392 sk = pt->af_packet_priv;
1395 * Yank back the headers [hope the device set this
1396 * right or kerboom...]
1398 * Incoming packets have ll header pulled,
1401 * For outgoing ones skb->data == skb_mac_header(skb)
1402 * so that this procedure is noop.
1405 if (skb->pkt_type == PACKET_LOOPBACK)
1408 if (!net_eq(dev_net(dev), sock_net(sk)))
1411 skb = skb_share_check(skb, GFP_ATOMIC);
1415 /* drop any routing info */
1418 /* drop conntrack reference */
1421 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1423 skb_push(skb, skb->data - skb_mac_header(skb));
1426 * The SOCK_PACKET socket receives _all_ frames.
1429 spkt->spkt_family = dev->type;
1430 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1431 spkt->spkt_protocol = skb->protocol;
1434 * Charge the memory to the socket. This is done specifically
1435 * to prevent sockets using all the memory up.
1438 if (sock_queue_rcv_skb(sk, skb) == 0)
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
1453 static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
1454 struct msghdr *msg, size_t len)
1456 struct sock *sk = sock->sk;
1457 struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
1458 struct sk_buff *skb = NULL;
1459 struct net_device *dev;
1464 * Get and verify the address.
1468 if (msg->msg_namelen < sizeof(struct sockaddr))
1470 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1471 proto = saddr->spkt_protocol;
1473 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1476 * Find the device first to size check it
1479 saddr->spkt_device[13] = 0;
1482 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1488 if (!(dev->flags & IFF_UP))
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.
1497 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
1501 size_t reserved = LL_RESERVED_SPACE(dev);
1502 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1505 skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL);
1508 /* FIXME: Save some space for broken drivers that write a hard
1509 * header at transmission time by themselves. PPP is the notable
1510 * one here. This should really be fixed at the driver level.
1512 skb_reserve(skb, reserved);
1513 skb_reset_network_header(skb);
1515 /* Try to align data part correctly */
1520 skb_reset_network_header(skb);
1522 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1528 if (len > (dev->mtu + dev->hard_header_len)) {
1529 /* Earlier code assumed this would be a VLAN pkt,
1530 * double-check this now that we have the actual
1533 struct ethhdr *ehdr;
1534 skb_reset_mac_header(skb);
1535 ehdr = eth_hdr(skb);
1536 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
1542 skb->protocol = proto;
1544 skb->priority = sk->sk_priority;
1545 skb->mark = sk->sk_mark;
1546 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1550 dev_queue_xmit(skb);
1561 static unsigned int run_filter(const struct sk_buff *skb,
1562 const struct sock *sk,
1565 struct sk_filter *filter;
1568 filter = rcu_dereference(sk->sk_filter);
1570 res = SK_RUN_FILTER(filter, skb);
1577 * This function makes lazy skb cloning in hope that most of packets
1578 * are discarded by BPF.
1580 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1581 * and skb->cb are mangled. It works because (and until) packets
1582 * falling here are owned by current CPU. Output packets are cloned
1583 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1584 * sequencially, so that if we return skb to original state on exit,
1585 * we will not harm anyone.
1588 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
1589 struct packet_type *pt, struct net_device *orig_dev)
1592 struct sockaddr_ll *sll;
1593 struct packet_sock *po;
1594 u8 *skb_head = skb->data;
1595 int skb_len = skb->len;
1596 unsigned int snaplen, res;
1598 if (skb->pkt_type == PACKET_LOOPBACK)
1601 sk = pt->af_packet_priv;
1604 if (!net_eq(dev_net(dev), sock_net(sk)))
1609 if (dev->header_ops) {
1610 /* The device has an explicit notion of ll header,
1611 * exported to higher levels.
1613 * Otherwise, the device hides details of its frame
1614 * structure, so that corresponding packet head is
1615 * never delivered to user.
1617 if (sk->sk_type != SOCK_DGRAM)
1618 skb_push(skb, skb->data - skb_mac_header(skb));
1619 else if (skb->pkt_type == PACKET_OUTGOING) {
1620 /* Special case: outgoing packets have ll header at head */
1621 skb_pull(skb, skb_network_offset(skb));
1627 res = run_filter(skb, sk, snaplen);
1629 goto drop_n_restore;
1633 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
1634 (unsigned)sk->sk_rcvbuf)
1637 if (skb_shared(skb)) {
1638 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1642 if (skb_head != skb->data) {
1643 skb->data = skb_head;
1650 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
1653 sll = &PACKET_SKB_CB(skb)->sa.ll;
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;
1658 if (unlikely(po->origdev))
1659 sll->sll_ifindex = orig_dev->ifindex;
1661 sll->sll_ifindex = dev->ifindex;
1663 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1665 PACKET_SKB_CB(skb)->origlen = skb->len;
1667 if (pskb_trim(skb, snaplen))
1670 skb_set_owner_r(skb, sk);
1674 /* drop conntrack reference */
1677 spin_lock(&sk->sk_receive_queue.lock);
1678 po->stats.tp_packets++;
1679 skb->dropcount = atomic_read(&sk->sk_drops);
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);
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);
1692 if (skb_head != skb->data && skb_shared(skb)) {
1693 skb->data = skb_head;
1701 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
1702 struct packet_type *pt, struct net_device *orig_dev)
1705 struct packet_sock *po;
1706 struct sockaddr_ll *sll;
1708 struct tpacket_hdr *h1;
1709 struct tpacket2_hdr *h2;
1710 struct tpacket3_hdr *h3;
1713 u8 *skb_head = skb->data;
1714 int skb_len = skb->len;
1715 unsigned int snaplen, res;
1716 unsigned long status = TP_STATUS_USER;
1717 unsigned short macoff, netoff, hdrlen;
1718 struct sk_buff *copy_skb = NULL;
1721 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
1723 if (skb->pkt_type == PACKET_LOOPBACK)
1726 sk = pt->af_packet_priv;
1729 if (!net_eq(dev_net(dev), sock_net(sk)))
1732 if (dev->header_ops) {
1733 if (sk->sk_type != SOCK_DGRAM)
1734 skb_push(skb, skb->data - skb_mac_header(skb));
1735 else if (skb->pkt_type == PACKET_OUTGOING) {
1736 /* Special case: outgoing packets have ll header at head */
1737 skb_pull(skb, skb_network_offset(skb));
1741 if (skb->ip_summed == CHECKSUM_PARTIAL)
1742 status |= TP_STATUS_CSUMNOTREADY;
1746 res = run_filter(skb, sk, snaplen);
1748 goto drop_n_restore;
1752 if (sk->sk_type == SOCK_DGRAM) {
1753 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
1756 unsigned maclen = skb_network_offset(skb);
1757 netoff = TPACKET_ALIGN(po->tp_hdrlen +
1758 (maclen < 16 ? 16 : maclen)) +
1760 macoff = netoff - maclen;
1762 if (po->tp_version <= TPACKET_V2) {
1763 if (macoff + snaplen > po->rx_ring.frame_size) {
1764 if (po->copy_thresh &&
1765 atomic_read(&sk->sk_rmem_alloc) + skb->truesize
1766 < (unsigned)sk->sk_rcvbuf) {
1767 if (skb_shared(skb)) {
1768 copy_skb = skb_clone(skb, GFP_ATOMIC);
1770 copy_skb = skb_get(skb);
1771 skb_head = skb->data;
1774 skb_set_owner_r(copy_skb, sk);
1776 snaplen = po->rx_ring.frame_size - macoff;
1777 if ((int)snaplen < 0)
1781 spin_lock(&sk->sk_receive_queue.lock);
1782 h.raw = packet_current_rx_frame(po, skb,
1783 TP_STATUS_KERNEL, (macoff+snaplen));
1786 if (po->tp_version <= TPACKET_V2) {
1787 packet_increment_rx_head(po, &po->rx_ring);
1789 * LOSING will be reported till you read the stats,
1790 * because it's COR - Clear On Read.
1791 * Anyways, moving it for V1/V2 only as V3 doesn't need this
1794 if (po->stats.tp_drops)
1795 status |= TP_STATUS_LOSING;
1797 po->stats.tp_packets++;
1799 status |= TP_STATUS_COPY;
1800 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
1802 spin_unlock(&sk->sk_receive_queue.lock);
1804 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
1806 switch (po->tp_version) {
1808 h.h1->tp_len = skb->len;
1809 h.h1->tp_snaplen = snaplen;
1810 h.h1->tp_mac = macoff;
1811 h.h1->tp_net = netoff;
1812 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1813 && shhwtstamps->syststamp.tv64)
1814 tv = ktime_to_timeval(shhwtstamps->syststamp);
1815 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1816 && shhwtstamps->hwtstamp.tv64)
1817 tv = ktime_to_timeval(shhwtstamps->hwtstamp);
1818 else if (skb->tstamp.tv64)
1819 tv = ktime_to_timeval(skb->tstamp);
1821 do_gettimeofday(&tv);
1822 h.h1->tp_sec = tv.tv_sec;
1823 h.h1->tp_usec = tv.tv_usec;
1824 hdrlen = sizeof(*h.h1);
1827 h.h2->tp_len = skb->len;
1828 h.h2->tp_snaplen = snaplen;
1829 h.h2->tp_mac = macoff;
1830 h.h2->tp_net = netoff;
1831 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1832 && shhwtstamps->syststamp.tv64)
1833 ts = ktime_to_timespec(shhwtstamps->syststamp);
1834 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1835 && shhwtstamps->hwtstamp.tv64)
1836 ts = ktime_to_timespec(shhwtstamps->hwtstamp);
1837 else if (skb->tstamp.tv64)
1838 ts = ktime_to_timespec(skb->tstamp);
1840 getnstimeofday(&ts);
1841 h.h2->tp_sec = ts.tv_sec;
1842 h.h2->tp_nsec = ts.tv_nsec;
1843 if (vlan_tx_tag_present(skb)) {
1844 h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
1845 status |= TP_STATUS_VLAN_VALID;
1847 h.h2->tp_vlan_tci = 0;
1849 h.h2->tp_padding = 0;
1850 hdrlen = sizeof(*h.h2);
1853 /* tp_nxt_offset,vlan are already populated above.
1854 * So DONT clear those fields here
1856 h.h3->tp_status |= status;
1857 h.h3->tp_len = skb->len;
1858 h.h3->tp_snaplen = snaplen;
1859 h.h3->tp_mac = macoff;
1860 h.h3->tp_net = netoff;
1861 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
1862 && shhwtstamps->syststamp.tv64)
1863 ts = ktime_to_timespec(shhwtstamps->syststamp);
1864 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
1865 && shhwtstamps->hwtstamp.tv64)
1866 ts = ktime_to_timespec(shhwtstamps->hwtstamp);
1867 else if (skb->tstamp.tv64)
1868 ts = ktime_to_timespec(skb->tstamp);
1870 getnstimeofday(&ts);
1871 h.h3->tp_sec = ts.tv_sec;
1872 h.h3->tp_nsec = ts.tv_nsec;
1873 hdrlen = sizeof(*h.h3);
1879 sll = h.raw + TPACKET_ALIGN(hdrlen);
1880 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
1881 sll->sll_family = AF_PACKET;
1882 sll->sll_hatype = dev->type;
1883 sll->sll_protocol = skb->protocol;
1884 sll->sll_pkttype = skb->pkt_type;
1885 if (unlikely(po->origdev))
1886 sll->sll_ifindex = orig_dev->ifindex;
1888 sll->sll_ifindex = dev->ifindex;
1891 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
1895 if (po->tp_version <= TPACKET_V2) {
1896 end = (u8 *)PAGE_ALIGN((unsigned long)h.raw
1897 + macoff + snaplen);
1898 for (start = h.raw; start < end; start += PAGE_SIZE)
1899 flush_dcache_page(pgv_to_page(start));
1904 if (po->tp_version <= TPACKET_V2)
1905 __packet_set_status(po, h.raw, status);
1907 prb_clear_blk_fill_status(&po->rx_ring);
1909 sk->sk_data_ready(sk, 0);
1912 if (skb_head != skb->data && skb_shared(skb)) {
1913 skb->data = skb_head;
1921 po->stats.tp_drops++;
1922 spin_unlock(&sk->sk_receive_queue.lock);
1924 sk->sk_data_ready(sk, 0);
1925 kfree_skb(copy_skb);
1926 goto drop_n_restore;
1929 static void tpacket_destruct_skb(struct sk_buff *skb)
1931 struct packet_sock *po = pkt_sk(skb->sk);
1934 if (likely(po->tx_ring.pg_vec)) {
1935 ph = skb_shinfo(skb)->destructor_arg;
1936 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
1937 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
1938 atomic_dec(&po->tx_ring.pending);
1939 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
1945 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
1946 void *frame, struct net_device *dev, int size_max,
1947 __be16 proto, unsigned char *addr, int hlen)
1950 struct tpacket_hdr *h1;
1951 struct tpacket2_hdr *h2;
1954 int to_write, offset, len, tp_len, nr_frags, len_max;
1955 struct socket *sock = po->sk.sk_socket;
1962 skb->protocol = proto;
1964 skb->priority = po->sk.sk_priority;
1965 skb->mark = po->sk.sk_mark;
1966 skb_shinfo(skb)->destructor_arg = ph.raw;
1968 switch (po->tp_version) {
1970 tp_len = ph.h2->tp_len;
1973 tp_len = ph.h1->tp_len;
1976 if (unlikely(tp_len > size_max)) {
1977 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
1981 skb_reserve(skb, hlen);
1982 skb_reset_network_header(skb);
1984 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
1987 if (sock->type == SOCK_DGRAM) {
1988 err = dev_hard_header(skb, dev, ntohs(proto), addr,
1990 if (unlikely(err < 0))
1992 } else if (dev->hard_header_len) {
1993 /* net device doesn't like empty head */
1994 if (unlikely(tp_len <= dev->hard_header_len)) {
1995 pr_err("packet size is too short (%d < %d)\n",
1996 tp_len, dev->hard_header_len);
2000 skb_push(skb, dev->hard_header_len);
2001 err = skb_store_bits(skb, 0, data,
2002 dev->hard_header_len);
2006 data += dev->hard_header_len;
2007 to_write -= dev->hard_header_len;
2011 offset = offset_in_page(data);
2012 len_max = PAGE_SIZE - offset;
2013 len = ((to_write > len_max) ? len_max : to_write);
2015 skb->data_len = to_write;
2016 skb->len += to_write;
2017 skb->truesize += to_write;
2018 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2020 while (likely(to_write)) {
2021 nr_frags = skb_shinfo(skb)->nr_frags;
2023 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2024 pr_err("Packet exceed the number of skb frags(%lu)\n",
2029 page = pgv_to_page(data);
2031 flush_dcache_page(page);
2033 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2036 len_max = PAGE_SIZE;
2037 len = ((to_write > len_max) ? len_max : to_write);
2043 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2045 struct sk_buff *skb;
2046 struct net_device *dev;
2048 bool need_rls_dev = false;
2049 int err, reserve = 0;
2051 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
2052 int tp_len, size_max;
2053 unsigned char *addr;
2058 mutex_lock(&po->pg_vec_lock);
2061 if (saddr == NULL) {
2062 dev = po->prot_hook.dev;
2067 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2069 if (msg->msg_namelen < (saddr->sll_halen
2070 + offsetof(struct sockaddr_ll,
2073 proto = saddr->sll_protocol;
2074 addr = saddr->sll_addr;
2075 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2076 need_rls_dev = true;
2080 if (unlikely(dev == NULL))
2083 reserve = dev->hard_header_len;
2086 if (unlikely(!(dev->flags & IFF_UP)))
2089 size_max = po->tx_ring.frame_size
2090 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2092 if (size_max > dev->mtu + reserve)
2093 size_max = dev->mtu + reserve;
2096 ph = packet_current_frame(po, &po->tx_ring,
2097 TP_STATUS_SEND_REQUEST);
2099 if (unlikely(ph == NULL)) {
2104 status = TP_STATUS_SEND_REQUEST;
2105 hlen = LL_RESERVED_SPACE(dev);
2106 tlen = dev->needed_tailroom;
2107 skb = sock_alloc_send_skb(&po->sk,
2108 hlen + tlen + sizeof(struct sockaddr_ll),
2111 if (unlikely(skb == NULL))
2114 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
2117 if (unlikely(tp_len < 0)) {
2119 __packet_set_status(po, ph,
2120 TP_STATUS_AVAILABLE);
2121 packet_increment_head(&po->tx_ring);
2125 status = TP_STATUS_WRONG_FORMAT;
2131 skb->destructor = tpacket_destruct_skb;
2132 __packet_set_status(po, ph, TP_STATUS_SENDING);
2133 atomic_inc(&po->tx_ring.pending);
2135 status = TP_STATUS_SEND_REQUEST;
2136 err = dev_queue_xmit(skb);
2137 if (unlikely(err > 0)) {
2138 err = net_xmit_errno(err);
2139 if (err && __packet_get_status(po, ph) ==
2140 TP_STATUS_AVAILABLE) {
2141 /* skb was destructed already */
2146 * skb was dropped but not destructed yet;
2147 * let's treat it like congestion or err < 0
2151 packet_increment_head(&po->tx_ring);
2153 } while (likely((ph != NULL) ||
2154 ((!(msg->msg_flags & MSG_DONTWAIT)) &&
2155 (atomic_read(&po->tx_ring.pending))))
2162 __packet_set_status(po, ph, status);
2168 mutex_unlock(&po->pg_vec_lock);
2172 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2173 size_t reserve, size_t len,
2174 size_t linear, int noblock,
2177 struct sk_buff *skb;
2179 /* Under a page? Don't bother with paged skb. */
2180 if (prepad + len < PAGE_SIZE || !linear)
2183 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2188 skb_reserve(skb, reserve);
2189 skb_put(skb, linear);
2190 skb->data_len = len - linear;
2191 skb->len += len - linear;
2196 static int packet_snd(struct socket *sock,
2197 struct msghdr *msg, size_t len)
2199 struct sock *sk = sock->sk;
2200 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
2201 struct sk_buff *skb;
2202 struct net_device *dev;
2204 bool need_rls_dev = false;
2205 unsigned char *addr;
2206 int err, reserve = 0;
2207 struct virtio_net_hdr vnet_hdr = { 0 };
2210 struct packet_sock *po = pkt_sk(sk);
2211 unsigned short gso_type = 0;
2215 * Get and verify the address.
2218 if (saddr == NULL) {
2219 dev = po->prot_hook.dev;
2224 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2226 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2228 proto = saddr->sll_protocol;
2229 addr = saddr->sll_addr;
2230 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2231 need_rls_dev = true;
2237 if (sock->type == SOCK_RAW)
2238 reserve = dev->hard_header_len;
2241 if (!(dev->flags & IFF_UP))
2244 if (po->has_vnet_hdr) {
2245 vnet_hdr_len = sizeof(vnet_hdr);
2248 if (len < vnet_hdr_len)
2251 len -= vnet_hdr_len;
2253 err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
2258 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2259 (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
2261 vnet_hdr.hdr_len = vnet_hdr.csum_start +
2262 vnet_hdr.csum_offset + 2;
2265 if (vnet_hdr.hdr_len > len)
2268 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2269 switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2270 case VIRTIO_NET_HDR_GSO_TCPV4:
2271 gso_type = SKB_GSO_TCPV4;
2273 case VIRTIO_NET_HDR_GSO_TCPV6:
2274 gso_type = SKB_GSO_TCPV6;
2276 case VIRTIO_NET_HDR_GSO_UDP:
2277 gso_type = SKB_GSO_UDP;
2283 if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
2284 gso_type |= SKB_GSO_TCP_ECN;
2286 if (vnet_hdr.gso_size == 0)
2293 if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
2297 hlen = LL_RESERVED_SPACE(dev);
2298 tlen = dev->needed_tailroom;
2299 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, vnet_hdr.hdr_len,
2300 msg->msg_flags & MSG_DONTWAIT, &err);
2304 skb_set_network_header(skb, reserve);
2307 if (sock->type == SOCK_DGRAM &&
2308 (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
2311 /* Returns -EFAULT on error */
2312 err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
2315 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
2319 if (!gso_type && (len > dev->mtu + reserve)) {
2320 /* Earlier code assumed this would be a VLAN pkt,
2321 * double-check this now that we have the actual
2324 struct ethhdr *ehdr;
2325 skb_reset_mac_header(skb);
2326 ehdr = eth_hdr(skb);
2327 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
2333 skb->protocol = proto;
2335 skb->priority = sk->sk_priority;
2336 skb->mark = sk->sk_mark;
2338 if (po->has_vnet_hdr) {
2339 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2340 if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
2341 vnet_hdr.csum_offset)) {
2347 skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
2348 skb_shinfo(skb)->gso_type = gso_type;
2350 /* Header must be checked, and gso_segs computed. */
2351 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2352 skb_shinfo(skb)->gso_segs = 0;
2354 len += vnet_hdr_len;
2361 err = dev_queue_xmit(skb);
2362 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2373 if (dev && need_rls_dev)
2379 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
2380 struct msghdr *msg, size_t len)
2382 struct sock *sk = sock->sk;
2383 struct packet_sock *po = pkt_sk(sk);
2384 if (po->tx_ring.pg_vec)
2385 return tpacket_snd(po, msg);
2387 return packet_snd(sock, msg, len);
2391 * Close a PACKET socket. This is fairly simple. We immediately go
2392 * to 'closed' state and remove our protocol entry in the device list.
2395 static int packet_release(struct socket *sock)
2397 struct sock *sk = sock->sk;
2398 struct packet_sock *po;
2400 union tpacket_req_u req_u;
2408 spin_lock_bh(&net->packet.sklist_lock);
2409 sk_del_node_init_rcu(sk);
2410 sock_prot_inuse_add(net, sk->sk_prot, -1);
2411 spin_unlock_bh(&net->packet.sklist_lock);
2413 spin_lock(&po->bind_lock);
2414 unregister_prot_hook(sk, false);
2415 if (po->prot_hook.dev) {
2416 dev_put(po->prot_hook.dev);
2417 po->prot_hook.dev = NULL;
2419 spin_unlock(&po->bind_lock);
2421 packet_flush_mclist(sk);
2423 memset(&req_u, 0, sizeof(req_u));
2425 if (po->rx_ring.pg_vec)
2426 packet_set_ring(sk, &req_u, 1, 0);
2428 if (po->tx_ring.pg_vec)
2429 packet_set_ring(sk, &req_u, 1, 1);
2435 * Now the socket is dead. No more input will appear.
2442 skb_queue_purge(&sk->sk_receive_queue);
2443 sk_refcnt_debug_release(sk);
2450 * Attach a packet hook.
2453 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
2455 struct packet_sock *po = pkt_sk(sk);
2462 spin_lock(&po->bind_lock);
2463 unregister_prot_hook(sk, true);
2465 po->prot_hook.type = protocol;
2466 if (po->prot_hook.dev)
2467 dev_put(po->prot_hook.dev);
2468 po->prot_hook.dev = dev;
2470 po->ifindex = dev ? dev->ifindex : 0;
2475 if (!dev || (dev->flags & IFF_UP)) {
2476 register_prot_hook(sk);
2478 sk->sk_err = ENETDOWN;
2479 if (!sock_flag(sk, SOCK_DEAD))
2480 sk->sk_error_report(sk);
2484 spin_unlock(&po->bind_lock);
2490 * Bind a packet socket to a device
2493 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
2496 struct sock *sk = sock->sk;
2498 struct net_device *dev;
2505 if (addr_len != sizeof(struct sockaddr))
2507 strlcpy(name, uaddr->sa_data, sizeof(name));
2509 dev = dev_get_by_name(sock_net(sk), name);
2511 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
2515 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
2517 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
2518 struct sock *sk = sock->sk;
2519 struct net_device *dev = NULL;
2527 if (addr_len < sizeof(struct sockaddr_ll))
2529 if (sll->sll_family != AF_PACKET)
2532 if (sll->sll_ifindex) {
2534 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
2538 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
2544 static struct proto packet_proto = {
2546 .owner = THIS_MODULE,
2547 .obj_size = sizeof(struct packet_sock),
2551 * Create a packet of type SOCK_PACKET.
2554 static int packet_create(struct net *net, struct socket *sock, int protocol,
2558 struct packet_sock *po;
2559 __be16 proto = (__force __be16)protocol; /* weird, but documented */
2562 if (!capable(CAP_NET_RAW))
2564 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
2565 sock->type != SOCK_PACKET)
2566 return -ESOCKTNOSUPPORT;
2568 sock->state = SS_UNCONNECTED;
2571 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
2575 sock->ops = &packet_ops;
2576 if (sock->type == SOCK_PACKET)
2577 sock->ops = &packet_ops_spkt;
2579 sock_init_data(sock, sk);
2582 sk->sk_family = PF_PACKET;
2585 sk->sk_destruct = packet_sock_destruct;
2586 sk_refcnt_debug_inc(sk);
2589 * Attach a protocol block
2592 spin_lock_init(&po->bind_lock);
2593 mutex_init(&po->pg_vec_lock);
2594 po->prot_hook.func = packet_rcv;
2596 if (sock->type == SOCK_PACKET)
2597 po->prot_hook.func = packet_rcv_spkt;
2599 po->prot_hook.af_packet_priv = sk;
2602 po->prot_hook.type = proto;
2603 register_prot_hook(sk);
2606 spin_lock_bh(&net->packet.sklist_lock);
2607 sk_add_node_rcu(sk, &net->packet.sklist);
2608 sock_prot_inuse_add(net, &packet_proto, 1);
2609 spin_unlock_bh(&net->packet.sklist_lock);
2616 static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
2618 struct sock_exterr_skb *serr;
2619 struct sk_buff *skb, *skb2;
2623 skb = skb_dequeue(&sk->sk_error_queue);
2629 msg->msg_flags |= MSG_TRUNC;
2632 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2636 sock_recv_timestamp(msg, sk, skb);
2638 serr = SKB_EXT_ERR(skb);
2639 put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
2640 sizeof(serr->ee), &serr->ee);
2642 msg->msg_flags |= MSG_ERRQUEUE;
2645 /* Reset and regenerate socket error */
2646 spin_lock_bh(&sk->sk_error_queue.lock);
2648 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2649 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2650 spin_unlock_bh(&sk->sk_error_queue.lock);
2651 sk->sk_error_report(sk);
2653 spin_unlock_bh(&sk->sk_error_queue.lock);
2662 * Pull a packet from our receive queue and hand it to the user.
2663 * If necessary we block.
2666 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
2667 struct msghdr *msg, size_t len, int flags)
2669 struct sock *sk = sock->sk;
2670 struct sk_buff *skb;
2672 struct sockaddr_ll *sll;
2673 int vnet_hdr_len = 0;
2676 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
2680 /* What error should we return now? EUNATTACH? */
2681 if (pkt_sk(sk)->ifindex < 0)
2685 if (flags & MSG_ERRQUEUE) {
2686 err = packet_recv_error(sk, msg, len);
2691 * Call the generic datagram receiver. This handles all sorts
2692 * of horrible races and re-entrancy so we can forget about it
2693 * in the protocol layers.
2695 * Now it will return ENETDOWN, if device have just gone down,
2696 * but then it will block.
2699 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
2702 * An error occurred so return it. Because skb_recv_datagram()
2703 * handles the blocking we don't see and worry about blocking
2710 if (pkt_sk(sk)->has_vnet_hdr) {
2711 struct virtio_net_hdr vnet_hdr = { 0 };
2714 vnet_hdr_len = sizeof(vnet_hdr);
2715 if (len < vnet_hdr_len)
2718 len -= vnet_hdr_len;
2720 if (skb_is_gso(skb)) {
2721 struct skb_shared_info *sinfo = skb_shinfo(skb);
2723 /* This is a hint as to how much should be linear. */
2724 vnet_hdr.hdr_len = skb_headlen(skb);
2725 vnet_hdr.gso_size = sinfo->gso_size;
2726 if (sinfo->gso_type & SKB_GSO_TCPV4)
2727 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
2728 else if (sinfo->gso_type & SKB_GSO_TCPV6)
2729 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
2730 else if (sinfo->gso_type & SKB_GSO_UDP)
2731 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
2732 else if (sinfo->gso_type & SKB_GSO_FCOE)
2736 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
2737 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
2739 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
2741 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2742 vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
2743 vnet_hdr.csum_start = skb_checksum_start_offset(skb);
2744 vnet_hdr.csum_offset = skb->csum_offset;
2745 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
2746 vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
2747 } /* else everything is zero */
2749 err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
2756 * If the address length field is there to be filled in, we fill
2760 sll = &PACKET_SKB_CB(skb)->sa.ll;
2761 if (sock->type == SOCK_PACKET)
2762 msg->msg_namelen = sizeof(struct sockaddr_pkt);
2764 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
2767 * You lose any data beyond the buffer you gave. If it worries a
2768 * user program they can ask the device for its MTU anyway.
2774 msg->msg_flags |= MSG_TRUNC;
2777 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2781 sock_recv_ts_and_drops(msg, sk, skb);
2784 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
2787 if (pkt_sk(sk)->auxdata) {
2788 struct tpacket_auxdata aux;
2790 aux.tp_status = TP_STATUS_USER;
2791 if (skb->ip_summed == CHECKSUM_PARTIAL)
2792 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
2793 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
2794 aux.tp_snaplen = skb->len;
2796 aux.tp_net = skb_network_offset(skb);
2797 if (vlan_tx_tag_present(skb)) {
2798 aux.tp_vlan_tci = vlan_tx_tag_get(skb);
2799 aux.tp_status |= TP_STATUS_VLAN_VALID;
2801 aux.tp_vlan_tci = 0;
2804 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
2808 * Free or return the buffer as appropriate. Again this
2809 * hides all the races and re-entrancy issues from us.
2811 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
2814 skb_free_datagram(sk, skb);
2819 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
2820 int *uaddr_len, int peer)
2822 struct net_device *dev;
2823 struct sock *sk = sock->sk;
2828 uaddr->sa_family = AF_PACKET;
2830 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
2832 strncpy(uaddr->sa_data, dev->name, 14);
2834 memset(uaddr->sa_data, 0, 14);
2836 *uaddr_len = sizeof(*uaddr);
2841 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
2842 int *uaddr_len, int peer)
2844 struct net_device *dev;
2845 struct sock *sk = sock->sk;
2846 struct packet_sock *po = pkt_sk(sk);
2847 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
2852 sll->sll_family = AF_PACKET;
2853 sll->sll_ifindex = po->ifindex;
2854 sll->sll_protocol = po->num;
2855 sll->sll_pkttype = 0;
2857 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
2859 sll->sll_hatype = dev->type;
2860 sll->sll_halen = dev->addr_len;
2861 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
2863 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
2867 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
2872 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
2876 case PACKET_MR_MULTICAST:
2877 if (i->alen != dev->addr_len)
2880 return dev_mc_add(dev, i->addr);
2882 return dev_mc_del(dev, i->addr);
2884 case PACKET_MR_PROMISC:
2885 return dev_set_promiscuity(dev, what);
2887 case PACKET_MR_ALLMULTI:
2888 return dev_set_allmulti(dev, what);
2890 case PACKET_MR_UNICAST:
2891 if (i->alen != dev->addr_len)
2894 return dev_uc_add(dev, i->addr);
2896 return dev_uc_del(dev, i->addr);
2904 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
2906 for ( ; i; i = i->next) {
2907 if (i->ifindex == dev->ifindex)
2908 packet_dev_mc(dev, i, what);
2912 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
2914 struct packet_sock *po = pkt_sk(sk);
2915 struct packet_mclist *ml, *i;
2916 struct net_device *dev;
2922 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
2927 if (mreq->mr_alen > dev->addr_len)
2931 i = kmalloc(sizeof(*i), GFP_KERNEL);
2936 for (ml = po->mclist; ml; ml = ml->next) {
2937 if (ml->ifindex == mreq->mr_ifindex &&
2938 ml->type == mreq->mr_type &&
2939 ml->alen == mreq->mr_alen &&
2940 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
2942 /* Free the new element ... */
2948 i->type = mreq->mr_type;
2949 i->ifindex = mreq->mr_ifindex;
2950 i->alen = mreq->mr_alen;
2951 memcpy(i->addr, mreq->mr_address, i->alen);
2953 i->next = po->mclist;
2955 err = packet_dev_mc(dev, i, 1);
2957 po->mclist = i->next;
2966 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
2968 struct packet_mclist *ml, **mlp;
2972 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
2973 if (ml->ifindex == mreq->mr_ifindex &&
2974 ml->type == mreq->mr_type &&
2975 ml->alen == mreq->mr_alen &&
2976 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
2977 if (--ml->count == 0) {
2978 struct net_device *dev;
2980 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
2982 packet_dev_mc(dev, ml, -1);
2990 return -EADDRNOTAVAIL;
2993 static void packet_flush_mclist(struct sock *sk)
2995 struct packet_sock *po = pkt_sk(sk);
2996 struct packet_mclist *ml;
3002 while ((ml = po->mclist) != NULL) {
3003 struct net_device *dev;
3005 po->mclist = ml->next;
3006 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3008 packet_dev_mc(dev, ml, -1);
3015 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3017 struct sock *sk = sock->sk;
3018 struct packet_sock *po = pkt_sk(sk);
3021 if (level != SOL_PACKET)
3022 return -ENOPROTOOPT;
3025 case PACKET_ADD_MEMBERSHIP:
3026 case PACKET_DROP_MEMBERSHIP:
3028 struct packet_mreq_max mreq;
3030 memset(&mreq, 0, sizeof(mreq));
3031 if (len < sizeof(struct packet_mreq))
3033 if (len > sizeof(mreq))
3035 if (copy_from_user(&mreq, optval, len))
3037 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3039 if (optname == PACKET_ADD_MEMBERSHIP)
3040 ret = packet_mc_add(sk, &mreq);
3042 ret = packet_mc_drop(sk, &mreq);
3046 case PACKET_RX_RING:
3047 case PACKET_TX_RING:
3049 union tpacket_req_u req_u;
3052 switch (po->tp_version) {
3055 len = sizeof(req_u.req);
3059 len = sizeof(req_u.req3);
3064 if (pkt_sk(sk)->has_vnet_hdr)
3066 if (copy_from_user(&req_u.req, optval, len))
3068 return packet_set_ring(sk, &req_u, 0,
3069 optname == PACKET_TX_RING);
3071 case PACKET_COPY_THRESH:
3075 if (optlen != sizeof(val))
3077 if (copy_from_user(&val, optval, sizeof(val)))
3080 pkt_sk(sk)->copy_thresh = val;
3083 case PACKET_VERSION:
3087 if (optlen != sizeof(val))
3089 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3091 if (copy_from_user(&val, optval, sizeof(val)))
3097 po->tp_version = val;
3103 case PACKET_RESERVE:
3107 if (optlen != sizeof(val))
3109 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3111 if (copy_from_user(&val, optval, sizeof(val)))
3113 po->tp_reserve = val;
3120 if (optlen != sizeof(val))
3122 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3124 if (copy_from_user(&val, optval, sizeof(val)))
3126 po->tp_loss = !!val;
3129 case PACKET_AUXDATA:
3133 if (optlen < sizeof(val))
3135 if (copy_from_user(&val, optval, sizeof(val)))
3138 po->auxdata = !!val;
3141 case PACKET_ORIGDEV:
3145 if (optlen < sizeof(val))
3147 if (copy_from_user(&val, optval, sizeof(val)))
3150 po->origdev = !!val;
3153 case PACKET_VNET_HDR:
3157 if (sock->type != SOCK_RAW)
3159 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3161 if (optlen < sizeof(val))
3163 if (copy_from_user(&val, optval, sizeof(val)))
3166 po->has_vnet_hdr = !!val;
3169 case PACKET_TIMESTAMP:
3173 if (optlen != sizeof(val))
3175 if (copy_from_user(&val, optval, sizeof(val)))
3178 po->tp_tstamp = val;
3185 if (optlen != sizeof(val))
3187 if (copy_from_user(&val, optval, sizeof(val)))
3190 return fanout_add(sk, val & 0xffff, val >> 16);
3193 return -ENOPROTOOPT;
3197 static int packet_getsockopt(struct socket *sock, int level, int optname,
3198 char __user *optval, int __user *optlen)
3202 struct sock *sk = sock->sk;
3203 struct packet_sock *po = pkt_sk(sk);
3205 struct tpacket_stats st;
3206 union tpacket_stats_u st_u;
3208 if (level != SOL_PACKET)
3209 return -ENOPROTOOPT;
3211 if (get_user(len, optlen))
3218 case PACKET_STATISTICS:
3219 if (po->tp_version == TPACKET_V3) {
3220 len = sizeof(struct tpacket_stats_v3);
3222 if (len > sizeof(struct tpacket_stats))
3223 len = sizeof(struct tpacket_stats);
3225 spin_lock_bh(&sk->sk_receive_queue.lock);
3226 if (po->tp_version == TPACKET_V3) {
3227 memcpy(&st_u.stats3, &po->stats,
3228 sizeof(struct tpacket_stats));
3229 st_u.stats3.tp_freeze_q_cnt =
3230 po->stats_u.stats3.tp_freeze_q_cnt;
3231 st_u.stats3.tp_packets += po->stats.tp_drops;
3232 data = &st_u.stats3;
3235 st.tp_packets += st.tp_drops;
3238 memset(&po->stats, 0, sizeof(st));
3239 spin_unlock_bh(&sk->sk_receive_queue.lock);
3241 case PACKET_AUXDATA:
3242 if (len > sizeof(int))
3248 case PACKET_ORIGDEV:
3249 if (len > sizeof(int))
3255 case PACKET_VNET_HDR:
3256 if (len > sizeof(int))
3258 val = po->has_vnet_hdr;
3262 case PACKET_VERSION:
3263 if (len > sizeof(int))
3265 val = po->tp_version;
3269 if (len > sizeof(int))
3271 if (copy_from_user(&val, optval, len))
3275 val = sizeof(struct tpacket_hdr);
3278 val = sizeof(struct tpacket2_hdr);
3281 val = sizeof(struct tpacket3_hdr);
3288 case PACKET_RESERVE:
3289 if (len > sizeof(unsigned int))
3290 len = sizeof(unsigned int);
3291 val = po->tp_reserve;
3295 if (len > sizeof(unsigned int))
3296 len = sizeof(unsigned int);
3300 case PACKET_TIMESTAMP:
3301 if (len > sizeof(int))
3303 val = po->tp_tstamp;
3307 if (len > sizeof(int))
3310 ((u32)po->fanout->id |
3311 ((u32)po->fanout->type << 16)) :
3316 return -ENOPROTOOPT;
3319 if (put_user(len, optlen))
3321 if (copy_to_user(optval, data, len))
3327 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
3330 struct hlist_node *node;
3331 struct net_device *dev = data;
3332 struct net *net = dev_net(dev);
3335 sk_for_each_rcu(sk, node, &net->packet.sklist) {
3336 struct packet_sock *po = pkt_sk(sk);
3339 case NETDEV_UNREGISTER:
3341 packet_dev_mclist(dev, po->mclist, -1);
3345 if (dev->ifindex == po->ifindex) {
3346 spin_lock(&po->bind_lock);
3348 __unregister_prot_hook(sk, false);
3349 sk->sk_err = ENETDOWN;
3350 if (!sock_flag(sk, SOCK_DEAD))
3351 sk->sk_error_report(sk);
3353 if (msg == NETDEV_UNREGISTER) {
3355 if (po->prot_hook.dev)
3356 dev_put(po->prot_hook.dev);
3357 po->prot_hook.dev = NULL;
3359 spin_unlock(&po->bind_lock);
3363 if (dev->ifindex == po->ifindex) {
3364 spin_lock(&po->bind_lock);
3366 register_prot_hook(sk);
3367 spin_unlock(&po->bind_lock);
3377 static int packet_ioctl(struct socket *sock, unsigned int cmd,
3380 struct sock *sk = sock->sk;
3385 int amount = sk_wmem_alloc_get(sk);
3387 return put_user(amount, (int __user *)arg);
3391 struct sk_buff *skb;
3394 spin_lock_bh(&sk->sk_receive_queue.lock);
3395 skb = skb_peek(&sk->sk_receive_queue);
3398 spin_unlock_bh(&sk->sk_receive_queue.lock);
3399 return put_user(amount, (int __user *)arg);
3402 return sock_get_timestamp(sk, (struct timeval __user *)arg);
3404 return sock_get_timestampns(sk, (struct timespec __user *)arg);
3414 case SIOCGIFBRDADDR:
3415 case SIOCSIFBRDADDR:
3416 case SIOCGIFNETMASK:
3417 case SIOCSIFNETMASK:
3418 case SIOCGIFDSTADDR:
3419 case SIOCSIFDSTADDR:
3421 return inet_dgram_ops.ioctl(sock, cmd, arg);
3425 return -ENOIOCTLCMD;
3430 static unsigned int packet_poll(struct file *file, struct socket *sock,
3433 struct sock *sk = sock->sk;
3434 struct packet_sock *po = pkt_sk(sk);
3435 unsigned int mask = datagram_poll(file, sock, wait);
3437 spin_lock_bh(&sk->sk_receive_queue.lock);
3438 if (po->rx_ring.pg_vec) {
3439 if (!packet_previous_rx_frame(po, &po->rx_ring,
3441 mask |= POLLIN | POLLRDNORM;
3443 spin_unlock_bh(&sk->sk_receive_queue.lock);
3444 spin_lock_bh(&sk->sk_write_queue.lock);
3445 if (po->tx_ring.pg_vec) {
3446 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
3447 mask |= POLLOUT | POLLWRNORM;
3449 spin_unlock_bh(&sk->sk_write_queue.lock);
3454 /* Dirty? Well, I still did not learn better way to account
3458 static void packet_mm_open(struct vm_area_struct *vma)
3460 struct file *file = vma->vm_file;
3461 struct socket *sock = file->private_data;
3462 struct sock *sk = sock->sk;
3465 atomic_inc(&pkt_sk(sk)->mapped);
3468 static void packet_mm_close(struct vm_area_struct *vma)
3470 struct file *file = vma->vm_file;
3471 struct socket *sock = file->private_data;
3472 struct sock *sk = sock->sk;
3475 atomic_dec(&pkt_sk(sk)->mapped);
3478 static const struct vm_operations_struct packet_mmap_ops = {
3479 .open = packet_mm_open,
3480 .close = packet_mm_close,
3483 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
3488 for (i = 0; i < len; i++) {
3489 if (likely(pg_vec[i].buffer)) {
3490 if (is_vmalloc_addr(pg_vec[i].buffer))
3491 vfree(pg_vec[i].buffer);
3493 free_pages((unsigned long)pg_vec[i].buffer,
3495 pg_vec[i].buffer = NULL;
3501 static char *alloc_one_pg_vec_page(unsigned long order)
3503 char *buffer = NULL;
3504 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
3505 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
3507 buffer = (char *) __get_free_pages(gfp_flags, order);
3513 * __get_free_pages failed, fall back to vmalloc
3515 buffer = vzalloc((1 << order) * PAGE_SIZE);
3521 * vmalloc failed, lets dig into swap here
3523 gfp_flags &= ~__GFP_NORETRY;
3524 buffer = (char *)__get_free_pages(gfp_flags, order);
3529 * complete and utter failure
3534 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
3536 unsigned int block_nr = req->tp_block_nr;
3540 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
3541 if (unlikely(!pg_vec))
3544 for (i = 0; i < block_nr; i++) {
3545 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
3546 if (unlikely(!pg_vec[i].buffer))
3547 goto out_free_pgvec;
3554 free_pg_vec(pg_vec, order, block_nr);
3559 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
3560 int closing, int tx_ring)
3562 struct pgv *pg_vec = NULL;
3563 struct packet_sock *po = pkt_sk(sk);
3564 int was_running, order = 0;
3565 struct packet_ring_buffer *rb;
3566 struct sk_buff_head *rb_queue;
3569 /* Added to avoid minimal code churn */
3570 struct tpacket_req *req = &req_u->req;
3572 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
3573 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
3574 WARN(1, "Tx-ring is not supported.\n");
3578 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
3579 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
3583 if (atomic_read(&po->mapped))
3585 if (atomic_read(&rb->pending))
3589 if (req->tp_block_nr) {
3590 /* Sanity tests and some calculations */
3592 if (unlikely(rb->pg_vec))
3595 switch (po->tp_version) {
3597 po->tp_hdrlen = TPACKET_HDRLEN;
3600 po->tp_hdrlen = TPACKET2_HDRLEN;
3603 po->tp_hdrlen = TPACKET3_HDRLEN;
3608 if (unlikely((int)req->tp_block_size <= 0))
3610 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
3612 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
3615 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
3618 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
3619 if (unlikely(rb->frames_per_block <= 0))
3621 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
3626 order = get_order(req->tp_block_size);
3627 pg_vec = alloc_pg_vec(req, order);
3628 if (unlikely(!pg_vec))
3630 switch (po->tp_version) {
3632 /* Transmit path is not supported. We checked
3633 * it above but just being paranoid
3636 init_prb_bdqc(po, rb, pg_vec, req_u, tx_ring);
3645 if (unlikely(req->tp_frame_nr))
3651 /* Detach socket from network */
3652 spin_lock(&po->bind_lock);
3653 was_running = po->running;
3657 __unregister_prot_hook(sk, false);
3659 spin_unlock(&po->bind_lock);
3664 mutex_lock(&po->pg_vec_lock);
3665 if (closing || atomic_read(&po->mapped) == 0) {
3667 spin_lock_bh(&rb_queue->lock);
3668 swap(rb->pg_vec, pg_vec);
3669 rb->frame_max = (req->tp_frame_nr - 1);
3671 rb->frame_size = req->tp_frame_size;
3672 spin_unlock_bh(&rb_queue->lock);
3674 swap(rb->pg_vec_order, order);
3675 swap(rb->pg_vec_len, req->tp_block_nr);
3677 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
3678 po->prot_hook.func = (po->rx_ring.pg_vec) ?
3679 tpacket_rcv : packet_rcv;
3680 skb_queue_purge(rb_queue);
3681 if (atomic_read(&po->mapped))
3682 pr_err("packet_mmap: vma is busy: %d\n",
3683 atomic_read(&po->mapped));
3685 mutex_unlock(&po->pg_vec_lock);
3687 spin_lock(&po->bind_lock);
3690 register_prot_hook(sk);
3692 spin_unlock(&po->bind_lock);
3693 if (closing && (po->tp_version > TPACKET_V2)) {
3694 /* Because we don't support block-based V3 on tx-ring */
3696 prb_shutdown_retire_blk_timer(po, tx_ring, rb_queue);
3701 free_pg_vec(pg_vec, order, req->tp_block_nr);
3706 static int packet_mmap(struct file *file, struct socket *sock,
3707 struct vm_area_struct *vma)
3709 struct sock *sk = sock->sk;
3710 struct packet_sock *po = pkt_sk(sk);
3711 unsigned long size, expected_size;
3712 struct packet_ring_buffer *rb;
3713 unsigned long start;
3720 mutex_lock(&po->pg_vec_lock);
3723 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
3725 expected_size += rb->pg_vec_len
3731 if (expected_size == 0)
3734 size = vma->vm_end - vma->vm_start;
3735 if (size != expected_size)
3738 start = vma->vm_start;
3739 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
3740 if (rb->pg_vec == NULL)
3743 for (i = 0; i < rb->pg_vec_len; i++) {
3745 void *kaddr = rb->pg_vec[i].buffer;
3748 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
3749 page = pgv_to_page(kaddr);
3750 err = vm_insert_page(vma, start, page);
3759 atomic_inc(&po->mapped);
3760 vma->vm_ops = &packet_mmap_ops;
3764 mutex_unlock(&po->pg_vec_lock);
3768 static const struct proto_ops packet_ops_spkt = {
3769 .family = PF_PACKET,
3770 .owner = THIS_MODULE,
3771 .release = packet_release,
3772 .bind = packet_bind_spkt,
3773 .connect = sock_no_connect,
3774 .socketpair = sock_no_socketpair,
3775 .accept = sock_no_accept,
3776 .getname = packet_getname_spkt,
3777 .poll = datagram_poll,
3778 .ioctl = packet_ioctl,
3779 .listen = sock_no_listen,
3780 .shutdown = sock_no_shutdown,
3781 .setsockopt = sock_no_setsockopt,
3782 .getsockopt = sock_no_getsockopt,
3783 .sendmsg = packet_sendmsg_spkt,
3784 .recvmsg = packet_recvmsg,
3785 .mmap = sock_no_mmap,
3786 .sendpage = sock_no_sendpage,
3789 static const struct proto_ops packet_ops = {
3790 .family = PF_PACKET,
3791 .owner = THIS_MODULE,
3792 .release = packet_release,
3793 .bind = packet_bind,
3794 .connect = sock_no_connect,
3795 .socketpair = sock_no_socketpair,
3796 .accept = sock_no_accept,
3797 .getname = packet_getname,
3798 .poll = packet_poll,
3799 .ioctl = packet_ioctl,
3800 .listen = sock_no_listen,
3801 .shutdown = sock_no_shutdown,
3802 .setsockopt = packet_setsockopt,
3803 .getsockopt = packet_getsockopt,
3804 .sendmsg = packet_sendmsg,
3805 .recvmsg = packet_recvmsg,
3806 .mmap = packet_mmap,
3807 .sendpage = sock_no_sendpage,
3810 static const struct net_proto_family packet_family_ops = {
3811 .family = PF_PACKET,
3812 .create = packet_create,
3813 .owner = THIS_MODULE,
3816 static struct notifier_block packet_netdev_notifier = {
3817 .notifier_call = packet_notifier,
3820 #ifdef CONFIG_PROC_FS
3822 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
3825 struct net *net = seq_file_net(seq);
3828 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
3831 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3833 struct net *net = seq_file_net(seq);
3834 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
3837 static void packet_seq_stop(struct seq_file *seq, void *v)
3843 static int packet_seq_show(struct seq_file *seq, void *v)
3845 if (v == SEQ_START_TOKEN)
3846 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
3848 struct sock *s = sk_entry(v);
3849 const struct packet_sock *po = pkt_sk(s);
3852 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
3854 atomic_read(&s->sk_refcnt),
3859 atomic_read(&s->sk_rmem_alloc),
3867 static const struct seq_operations packet_seq_ops = {
3868 .start = packet_seq_start,
3869 .next = packet_seq_next,
3870 .stop = packet_seq_stop,
3871 .show = packet_seq_show,
3874 static int packet_seq_open(struct inode *inode, struct file *file)
3876 return seq_open_net(inode, file, &packet_seq_ops,
3877 sizeof(struct seq_net_private));
3880 static const struct file_operations packet_seq_fops = {
3881 .owner = THIS_MODULE,
3882 .open = packet_seq_open,
3884 .llseek = seq_lseek,
3885 .release = seq_release_net,
3890 static int __net_init packet_net_init(struct net *net)
3892 spin_lock_init(&net->packet.sklist_lock);
3893 INIT_HLIST_HEAD(&net->packet.sklist);
3895 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
3901 static void __net_exit packet_net_exit(struct net *net)
3903 proc_net_remove(net, "packet");
3906 static struct pernet_operations packet_net_ops = {
3907 .init = packet_net_init,
3908 .exit = packet_net_exit,
3912 static void __exit packet_exit(void)
3914 unregister_netdevice_notifier(&packet_netdev_notifier);
3915 unregister_pernet_subsys(&packet_net_ops);
3916 sock_unregister(PF_PACKET);
3917 proto_unregister(&packet_proto);
3920 static int __init packet_init(void)
3922 int rc = proto_register(&packet_proto, 0);
3927 sock_register(&packet_family_ops);
3928 register_pernet_subsys(&packet_net_ops);
3929 register_netdevice_notifier(&packet_netdev_notifier);
3934 module_init(packet_init);
3935 module_exit(packet_exit);
3936 MODULE_LICENSE("GPL");
3937 MODULE_ALIAS_NETPROTO(PF_PACKET);