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)
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, LL_RESERVED_SPACE(dev));
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;
2057 mutex_lock(&po->pg_vec_lock);
2060 if (saddr == NULL) {
2061 dev = po->prot_hook.dev;
2066 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2068 if (msg->msg_namelen < (saddr->sll_halen
2069 + offsetof(struct sockaddr_ll,
2072 proto = saddr->sll_protocol;
2073 addr = saddr->sll_addr;
2074 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2075 need_rls_dev = true;
2079 if (unlikely(dev == NULL))
2082 reserve = dev->hard_header_len;
2085 if (unlikely(!(dev->flags & IFF_UP)))
2088 size_max = po->tx_ring.frame_size
2089 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2091 if (size_max > dev->mtu + reserve)
2092 size_max = dev->mtu + reserve;
2095 ph = packet_current_frame(po, &po->tx_ring,
2096 TP_STATUS_SEND_REQUEST);
2098 if (unlikely(ph == NULL)) {
2103 status = TP_STATUS_SEND_REQUEST;
2104 skb = sock_alloc_send_skb(&po->sk,
2105 LL_ALLOCATED_SPACE(dev)
2106 + sizeof(struct sockaddr_ll),
2109 if (unlikely(skb == NULL))
2112 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
2115 if (unlikely(tp_len < 0)) {
2117 __packet_set_status(po, ph,
2118 TP_STATUS_AVAILABLE);
2119 packet_increment_head(&po->tx_ring);
2123 status = TP_STATUS_WRONG_FORMAT;
2129 skb->destructor = tpacket_destruct_skb;
2130 __packet_set_status(po, ph, TP_STATUS_SENDING);
2131 atomic_inc(&po->tx_ring.pending);
2133 status = TP_STATUS_SEND_REQUEST;
2134 err = dev_queue_xmit(skb);
2135 if (unlikely(err > 0)) {
2136 err = net_xmit_errno(err);
2137 if (err && __packet_get_status(po, ph) ==
2138 TP_STATUS_AVAILABLE) {
2139 /* skb was destructed already */
2144 * skb was dropped but not destructed yet;
2145 * let's treat it like congestion or err < 0
2149 packet_increment_head(&po->tx_ring);
2151 } while (likely((ph != NULL) ||
2152 ((!(msg->msg_flags & MSG_DONTWAIT)) &&
2153 (atomic_read(&po->tx_ring.pending))))
2160 __packet_set_status(po, ph, status);
2166 mutex_unlock(&po->pg_vec_lock);
2170 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2171 size_t reserve, size_t len,
2172 size_t linear, int noblock,
2175 struct sk_buff *skb;
2177 /* Under a page? Don't bother with paged skb. */
2178 if (prepad + len < PAGE_SIZE || !linear)
2181 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2186 skb_reserve(skb, reserve);
2187 skb_put(skb, linear);
2188 skb->data_len = len - linear;
2189 skb->len += len - linear;
2194 static int packet_snd(struct socket *sock,
2195 struct msghdr *msg, size_t len)
2197 struct sock *sk = sock->sk;
2198 struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
2199 struct sk_buff *skb;
2200 struct net_device *dev;
2202 bool need_rls_dev = false;
2203 unsigned char *addr;
2204 int err, reserve = 0;
2205 struct virtio_net_hdr vnet_hdr = { 0 };
2208 struct packet_sock *po = pkt_sk(sk);
2209 unsigned short gso_type = 0;
2212 * Get and verify the address.
2215 if (saddr == NULL) {
2216 dev = po->prot_hook.dev;
2221 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2223 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2225 proto = saddr->sll_protocol;
2226 addr = saddr->sll_addr;
2227 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2228 need_rls_dev = true;
2234 if (sock->type == SOCK_RAW)
2235 reserve = dev->hard_header_len;
2238 if (!(dev->flags & IFF_UP))
2241 if (po->has_vnet_hdr) {
2242 vnet_hdr_len = sizeof(vnet_hdr);
2245 if (len < vnet_hdr_len)
2248 len -= vnet_hdr_len;
2250 err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
2255 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2256 (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
2258 vnet_hdr.hdr_len = vnet_hdr.csum_start +
2259 vnet_hdr.csum_offset + 2;
2262 if (vnet_hdr.hdr_len > len)
2265 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2266 switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2267 case VIRTIO_NET_HDR_GSO_TCPV4:
2268 gso_type = SKB_GSO_TCPV4;
2270 case VIRTIO_NET_HDR_GSO_TCPV6:
2271 gso_type = SKB_GSO_TCPV6;
2273 case VIRTIO_NET_HDR_GSO_UDP:
2274 gso_type = SKB_GSO_UDP;
2280 if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
2281 gso_type |= SKB_GSO_TCP_ECN;
2283 if (vnet_hdr.gso_size == 0)
2290 if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
2294 skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
2295 LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
2296 msg->msg_flags & MSG_DONTWAIT, &err);
2300 skb_set_network_header(skb, reserve);
2303 if (sock->type == SOCK_DGRAM &&
2304 (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
2307 /* Returns -EFAULT on error */
2308 err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
2311 err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
2315 if (!gso_type && (len > dev->mtu + reserve)) {
2316 /* Earlier code assumed this would be a VLAN pkt,
2317 * double-check this now that we have the actual
2320 struct ethhdr *ehdr;
2321 skb_reset_mac_header(skb);
2322 ehdr = eth_hdr(skb);
2323 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
2329 skb->protocol = proto;
2331 skb->priority = sk->sk_priority;
2332 skb->mark = sk->sk_mark;
2334 if (po->has_vnet_hdr) {
2335 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2336 if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
2337 vnet_hdr.csum_offset)) {
2343 skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
2344 skb_shinfo(skb)->gso_type = gso_type;
2346 /* Header must be checked, and gso_segs computed. */
2347 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2348 skb_shinfo(skb)->gso_segs = 0;
2350 len += vnet_hdr_len;
2357 err = dev_queue_xmit(skb);
2358 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2369 if (dev && need_rls_dev)
2375 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
2376 struct msghdr *msg, size_t len)
2378 struct sock *sk = sock->sk;
2379 struct packet_sock *po = pkt_sk(sk);
2380 if (po->tx_ring.pg_vec)
2381 return tpacket_snd(po, msg);
2383 return packet_snd(sock, msg, len);
2387 * Close a PACKET socket. This is fairly simple. We immediately go
2388 * to 'closed' state and remove our protocol entry in the device list.
2391 static int packet_release(struct socket *sock)
2393 struct sock *sk = sock->sk;
2394 struct packet_sock *po;
2396 union tpacket_req_u req_u;
2404 spin_lock_bh(&net->packet.sklist_lock);
2405 sk_del_node_init_rcu(sk);
2406 sock_prot_inuse_add(net, sk->sk_prot, -1);
2407 spin_unlock_bh(&net->packet.sklist_lock);
2409 spin_lock(&po->bind_lock);
2410 unregister_prot_hook(sk, false);
2411 if (po->prot_hook.dev) {
2412 dev_put(po->prot_hook.dev);
2413 po->prot_hook.dev = NULL;
2415 spin_unlock(&po->bind_lock);
2417 packet_flush_mclist(sk);
2419 memset(&req_u, 0, sizeof(req_u));
2421 if (po->rx_ring.pg_vec)
2422 packet_set_ring(sk, &req_u, 1, 0);
2424 if (po->tx_ring.pg_vec)
2425 packet_set_ring(sk, &req_u, 1, 1);
2431 * Now the socket is dead. No more input will appear.
2438 skb_queue_purge(&sk->sk_receive_queue);
2439 sk_refcnt_debug_release(sk);
2446 * Attach a packet hook.
2449 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
2451 struct packet_sock *po = pkt_sk(sk);
2458 spin_lock(&po->bind_lock);
2459 unregister_prot_hook(sk, true);
2461 po->prot_hook.type = protocol;
2462 if (po->prot_hook.dev)
2463 dev_put(po->prot_hook.dev);
2464 po->prot_hook.dev = dev;
2466 po->ifindex = dev ? dev->ifindex : 0;
2471 if (!dev || (dev->flags & IFF_UP)) {
2472 register_prot_hook(sk);
2474 sk->sk_err = ENETDOWN;
2475 if (!sock_flag(sk, SOCK_DEAD))
2476 sk->sk_error_report(sk);
2480 spin_unlock(&po->bind_lock);
2486 * Bind a packet socket to a device
2489 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
2492 struct sock *sk = sock->sk;
2494 struct net_device *dev;
2501 if (addr_len != sizeof(struct sockaddr))
2503 strlcpy(name, uaddr->sa_data, sizeof(name));
2505 dev = dev_get_by_name(sock_net(sk), name);
2507 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
2511 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
2513 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
2514 struct sock *sk = sock->sk;
2515 struct net_device *dev = NULL;
2523 if (addr_len < sizeof(struct sockaddr_ll))
2525 if (sll->sll_family != AF_PACKET)
2528 if (sll->sll_ifindex) {
2530 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
2534 err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
2540 static struct proto packet_proto = {
2542 .owner = THIS_MODULE,
2543 .obj_size = sizeof(struct packet_sock),
2547 * Create a packet of type SOCK_PACKET.
2550 static int packet_create(struct net *net, struct socket *sock, int protocol,
2554 struct packet_sock *po;
2555 __be16 proto = (__force __be16)protocol; /* weird, but documented */
2558 if (!capable(CAP_NET_RAW))
2560 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
2561 sock->type != SOCK_PACKET)
2562 return -ESOCKTNOSUPPORT;
2564 sock->state = SS_UNCONNECTED;
2567 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
2571 sock->ops = &packet_ops;
2572 if (sock->type == SOCK_PACKET)
2573 sock->ops = &packet_ops_spkt;
2575 sock_init_data(sock, sk);
2578 sk->sk_family = PF_PACKET;
2581 sk->sk_destruct = packet_sock_destruct;
2582 sk_refcnt_debug_inc(sk);
2585 * Attach a protocol block
2588 spin_lock_init(&po->bind_lock);
2589 mutex_init(&po->pg_vec_lock);
2590 po->prot_hook.func = packet_rcv;
2592 if (sock->type == SOCK_PACKET)
2593 po->prot_hook.func = packet_rcv_spkt;
2595 po->prot_hook.af_packet_priv = sk;
2598 po->prot_hook.type = proto;
2599 register_prot_hook(sk);
2602 spin_lock_bh(&net->packet.sklist_lock);
2603 sk_add_node_rcu(sk, &net->packet.sklist);
2604 sock_prot_inuse_add(net, &packet_proto, 1);
2605 spin_unlock_bh(&net->packet.sklist_lock);
2612 static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
2614 struct sock_exterr_skb *serr;
2615 struct sk_buff *skb, *skb2;
2619 skb = skb_dequeue(&sk->sk_error_queue);
2625 msg->msg_flags |= MSG_TRUNC;
2628 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2632 sock_recv_timestamp(msg, sk, skb);
2634 serr = SKB_EXT_ERR(skb);
2635 put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
2636 sizeof(serr->ee), &serr->ee);
2638 msg->msg_flags |= MSG_ERRQUEUE;
2641 /* Reset and regenerate socket error */
2642 spin_lock_bh(&sk->sk_error_queue.lock);
2644 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
2645 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
2646 spin_unlock_bh(&sk->sk_error_queue.lock);
2647 sk->sk_error_report(sk);
2649 spin_unlock_bh(&sk->sk_error_queue.lock);
2658 * Pull a packet from our receive queue and hand it to the user.
2659 * If necessary we block.
2662 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
2663 struct msghdr *msg, size_t len, int flags)
2665 struct sock *sk = sock->sk;
2666 struct sk_buff *skb;
2668 struct sockaddr_ll *sll;
2669 int vnet_hdr_len = 0;
2672 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
2676 /* What error should we return now? EUNATTACH? */
2677 if (pkt_sk(sk)->ifindex < 0)
2681 if (flags & MSG_ERRQUEUE) {
2682 err = packet_recv_error(sk, msg, len);
2687 * Call the generic datagram receiver. This handles all sorts
2688 * of horrible races and re-entrancy so we can forget about it
2689 * in the protocol layers.
2691 * Now it will return ENETDOWN, if device have just gone down,
2692 * but then it will block.
2695 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
2698 * An error occurred so return it. Because skb_recv_datagram()
2699 * handles the blocking we don't see and worry about blocking
2706 if (pkt_sk(sk)->has_vnet_hdr) {
2707 struct virtio_net_hdr vnet_hdr = { 0 };
2710 vnet_hdr_len = sizeof(vnet_hdr);
2711 if (len < vnet_hdr_len)
2714 len -= vnet_hdr_len;
2716 if (skb_is_gso(skb)) {
2717 struct skb_shared_info *sinfo = skb_shinfo(skb);
2719 /* This is a hint as to how much should be linear. */
2720 vnet_hdr.hdr_len = skb_headlen(skb);
2721 vnet_hdr.gso_size = sinfo->gso_size;
2722 if (sinfo->gso_type & SKB_GSO_TCPV4)
2723 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
2724 else if (sinfo->gso_type & SKB_GSO_TCPV6)
2725 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
2726 else if (sinfo->gso_type & SKB_GSO_UDP)
2727 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
2728 else if (sinfo->gso_type & SKB_GSO_FCOE)
2732 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
2733 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
2735 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
2737 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2738 vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
2739 vnet_hdr.csum_start = skb_checksum_start_offset(skb);
2740 vnet_hdr.csum_offset = skb->csum_offset;
2741 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
2742 vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
2743 } /* else everything is zero */
2745 err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
2752 * If the address length field is there to be filled in, we fill
2756 sll = &PACKET_SKB_CB(skb)->sa.ll;
2757 if (sock->type == SOCK_PACKET)
2758 msg->msg_namelen = sizeof(struct sockaddr_pkt);
2760 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
2763 * You lose any data beyond the buffer you gave. If it worries a
2764 * user program they can ask the device for its MTU anyway.
2770 msg->msg_flags |= MSG_TRUNC;
2773 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2777 sock_recv_ts_and_drops(msg, sk, skb);
2780 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
2783 if (pkt_sk(sk)->auxdata) {
2784 struct tpacket_auxdata aux;
2786 aux.tp_status = TP_STATUS_USER;
2787 if (skb->ip_summed == CHECKSUM_PARTIAL)
2788 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
2789 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
2790 aux.tp_snaplen = skb->len;
2792 aux.tp_net = skb_network_offset(skb);
2793 if (vlan_tx_tag_present(skb)) {
2794 aux.tp_vlan_tci = vlan_tx_tag_get(skb);
2795 aux.tp_status |= TP_STATUS_VLAN_VALID;
2797 aux.tp_vlan_tci = 0;
2800 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
2804 * Free or return the buffer as appropriate. Again this
2805 * hides all the races and re-entrancy issues from us.
2807 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
2810 skb_free_datagram(sk, skb);
2815 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
2816 int *uaddr_len, int peer)
2818 struct net_device *dev;
2819 struct sock *sk = sock->sk;
2824 uaddr->sa_family = AF_PACKET;
2826 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
2828 strncpy(uaddr->sa_data, dev->name, 14);
2830 memset(uaddr->sa_data, 0, 14);
2832 *uaddr_len = sizeof(*uaddr);
2837 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
2838 int *uaddr_len, int peer)
2840 struct net_device *dev;
2841 struct sock *sk = sock->sk;
2842 struct packet_sock *po = pkt_sk(sk);
2843 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
2848 sll->sll_family = AF_PACKET;
2849 sll->sll_ifindex = po->ifindex;
2850 sll->sll_protocol = po->num;
2851 sll->sll_pkttype = 0;
2853 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
2855 sll->sll_hatype = dev->type;
2856 sll->sll_halen = dev->addr_len;
2857 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
2859 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
2863 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
2868 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
2872 case PACKET_MR_MULTICAST:
2873 if (i->alen != dev->addr_len)
2876 return dev_mc_add(dev, i->addr);
2878 return dev_mc_del(dev, i->addr);
2880 case PACKET_MR_PROMISC:
2881 return dev_set_promiscuity(dev, what);
2883 case PACKET_MR_ALLMULTI:
2884 return dev_set_allmulti(dev, what);
2886 case PACKET_MR_UNICAST:
2887 if (i->alen != dev->addr_len)
2890 return dev_uc_add(dev, i->addr);
2892 return dev_uc_del(dev, i->addr);
2900 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
2902 for ( ; i; i = i->next) {
2903 if (i->ifindex == dev->ifindex)
2904 packet_dev_mc(dev, i, what);
2908 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
2910 struct packet_sock *po = pkt_sk(sk);
2911 struct packet_mclist *ml, *i;
2912 struct net_device *dev;
2918 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
2923 if (mreq->mr_alen > dev->addr_len)
2927 i = kmalloc(sizeof(*i), GFP_KERNEL);
2932 for (ml = po->mclist; ml; ml = ml->next) {
2933 if (ml->ifindex == mreq->mr_ifindex &&
2934 ml->type == mreq->mr_type &&
2935 ml->alen == mreq->mr_alen &&
2936 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
2938 /* Free the new element ... */
2944 i->type = mreq->mr_type;
2945 i->ifindex = mreq->mr_ifindex;
2946 i->alen = mreq->mr_alen;
2947 memcpy(i->addr, mreq->mr_address, i->alen);
2949 i->next = po->mclist;
2951 err = packet_dev_mc(dev, i, 1);
2953 po->mclist = i->next;
2962 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
2964 struct packet_mclist *ml, **mlp;
2968 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
2969 if (ml->ifindex == mreq->mr_ifindex &&
2970 ml->type == mreq->mr_type &&
2971 ml->alen == mreq->mr_alen &&
2972 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
2973 if (--ml->count == 0) {
2974 struct net_device *dev;
2976 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
2978 packet_dev_mc(dev, ml, -1);
2986 return -EADDRNOTAVAIL;
2989 static void packet_flush_mclist(struct sock *sk)
2991 struct packet_sock *po = pkt_sk(sk);
2992 struct packet_mclist *ml;
2998 while ((ml = po->mclist) != NULL) {
2999 struct net_device *dev;
3001 po->mclist = ml->next;
3002 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3004 packet_dev_mc(dev, ml, -1);
3011 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3013 struct sock *sk = sock->sk;
3014 struct packet_sock *po = pkt_sk(sk);
3017 if (level != SOL_PACKET)
3018 return -ENOPROTOOPT;
3021 case PACKET_ADD_MEMBERSHIP:
3022 case PACKET_DROP_MEMBERSHIP:
3024 struct packet_mreq_max mreq;
3026 memset(&mreq, 0, sizeof(mreq));
3027 if (len < sizeof(struct packet_mreq))
3029 if (len > sizeof(mreq))
3031 if (copy_from_user(&mreq, optval, len))
3033 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3035 if (optname == PACKET_ADD_MEMBERSHIP)
3036 ret = packet_mc_add(sk, &mreq);
3038 ret = packet_mc_drop(sk, &mreq);
3042 case PACKET_RX_RING:
3043 case PACKET_TX_RING:
3045 union tpacket_req_u req_u;
3048 switch (po->tp_version) {
3051 len = sizeof(req_u.req);
3055 len = sizeof(req_u.req3);
3060 if (pkt_sk(sk)->has_vnet_hdr)
3062 if (copy_from_user(&req_u.req, optval, len))
3064 return packet_set_ring(sk, &req_u, 0,
3065 optname == PACKET_TX_RING);
3067 case PACKET_COPY_THRESH:
3071 if (optlen != sizeof(val))
3073 if (copy_from_user(&val, optval, sizeof(val)))
3076 pkt_sk(sk)->copy_thresh = val;
3079 case PACKET_VERSION:
3083 if (optlen != sizeof(val))
3085 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3087 if (copy_from_user(&val, optval, sizeof(val)))
3093 po->tp_version = val;
3099 case PACKET_RESERVE:
3103 if (optlen != sizeof(val))
3105 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3107 if (copy_from_user(&val, optval, sizeof(val)))
3109 po->tp_reserve = val;
3116 if (optlen != sizeof(val))
3118 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3120 if (copy_from_user(&val, optval, sizeof(val)))
3122 po->tp_loss = !!val;
3125 case PACKET_AUXDATA:
3129 if (optlen < sizeof(val))
3131 if (copy_from_user(&val, optval, sizeof(val)))
3134 po->auxdata = !!val;
3137 case PACKET_ORIGDEV:
3141 if (optlen < sizeof(val))
3143 if (copy_from_user(&val, optval, sizeof(val)))
3146 po->origdev = !!val;
3149 case PACKET_VNET_HDR:
3153 if (sock->type != SOCK_RAW)
3155 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3157 if (optlen < sizeof(val))
3159 if (copy_from_user(&val, optval, sizeof(val)))
3162 po->has_vnet_hdr = !!val;
3165 case PACKET_TIMESTAMP:
3169 if (optlen != sizeof(val))
3171 if (copy_from_user(&val, optval, sizeof(val)))
3174 po->tp_tstamp = val;
3181 if (optlen != sizeof(val))
3183 if (copy_from_user(&val, optval, sizeof(val)))
3186 return fanout_add(sk, val & 0xffff, val >> 16);
3189 return -ENOPROTOOPT;
3193 static int packet_getsockopt(struct socket *sock, int level, int optname,
3194 char __user *optval, int __user *optlen)
3198 struct sock *sk = sock->sk;
3199 struct packet_sock *po = pkt_sk(sk);
3201 struct tpacket_stats st;
3202 union tpacket_stats_u st_u;
3204 if (level != SOL_PACKET)
3205 return -ENOPROTOOPT;
3207 if (get_user(len, optlen))
3214 case PACKET_STATISTICS:
3215 if (po->tp_version == TPACKET_V3) {
3216 len = sizeof(struct tpacket_stats_v3);
3218 if (len > sizeof(struct tpacket_stats))
3219 len = sizeof(struct tpacket_stats);
3221 spin_lock_bh(&sk->sk_receive_queue.lock);
3222 if (po->tp_version == TPACKET_V3) {
3223 memcpy(&st_u.stats3, &po->stats,
3224 sizeof(struct tpacket_stats));
3225 st_u.stats3.tp_freeze_q_cnt =
3226 po->stats_u.stats3.tp_freeze_q_cnt;
3227 st_u.stats3.tp_packets += po->stats.tp_drops;
3228 data = &st_u.stats3;
3231 st.tp_packets += st.tp_drops;
3234 memset(&po->stats, 0, sizeof(st));
3235 spin_unlock_bh(&sk->sk_receive_queue.lock);
3237 case PACKET_AUXDATA:
3238 if (len > sizeof(int))
3244 case PACKET_ORIGDEV:
3245 if (len > sizeof(int))
3251 case PACKET_VNET_HDR:
3252 if (len > sizeof(int))
3254 val = po->has_vnet_hdr;
3258 case PACKET_VERSION:
3259 if (len > sizeof(int))
3261 val = po->tp_version;
3265 if (len > sizeof(int))
3267 if (copy_from_user(&val, optval, len))
3271 val = sizeof(struct tpacket_hdr);
3274 val = sizeof(struct tpacket2_hdr);
3277 val = sizeof(struct tpacket3_hdr);
3284 case PACKET_RESERVE:
3285 if (len > sizeof(unsigned int))
3286 len = sizeof(unsigned int);
3287 val = po->tp_reserve;
3291 if (len > sizeof(unsigned int))
3292 len = sizeof(unsigned int);
3296 case PACKET_TIMESTAMP:
3297 if (len > sizeof(int))
3299 val = po->tp_tstamp;
3303 if (len > sizeof(int))
3306 ((u32)po->fanout->id |
3307 ((u32)po->fanout->type << 16)) :
3312 return -ENOPROTOOPT;
3315 if (put_user(len, optlen))
3317 if (copy_to_user(optval, data, len))
3323 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
3326 struct hlist_node *node;
3327 struct net_device *dev = data;
3328 struct net *net = dev_net(dev);
3331 sk_for_each_rcu(sk, node, &net->packet.sklist) {
3332 struct packet_sock *po = pkt_sk(sk);
3335 case NETDEV_UNREGISTER:
3337 packet_dev_mclist(dev, po->mclist, -1);
3341 if (dev->ifindex == po->ifindex) {
3342 spin_lock(&po->bind_lock);
3344 __unregister_prot_hook(sk, false);
3345 sk->sk_err = ENETDOWN;
3346 if (!sock_flag(sk, SOCK_DEAD))
3347 sk->sk_error_report(sk);
3349 if (msg == NETDEV_UNREGISTER) {
3351 if (po->prot_hook.dev)
3352 dev_put(po->prot_hook.dev);
3353 po->prot_hook.dev = NULL;
3355 spin_unlock(&po->bind_lock);
3359 if (dev->ifindex == po->ifindex) {
3360 spin_lock(&po->bind_lock);
3362 register_prot_hook(sk);
3363 spin_unlock(&po->bind_lock);
3373 static int packet_ioctl(struct socket *sock, unsigned int cmd,
3376 struct sock *sk = sock->sk;
3381 int amount = sk_wmem_alloc_get(sk);
3383 return put_user(amount, (int __user *)arg);
3387 struct sk_buff *skb;
3390 spin_lock_bh(&sk->sk_receive_queue.lock);
3391 skb = skb_peek(&sk->sk_receive_queue);
3394 spin_unlock_bh(&sk->sk_receive_queue.lock);
3395 return put_user(amount, (int __user *)arg);
3398 return sock_get_timestamp(sk, (struct timeval __user *)arg);
3400 return sock_get_timestampns(sk, (struct timespec __user *)arg);
3410 case SIOCGIFBRDADDR:
3411 case SIOCSIFBRDADDR:
3412 case SIOCGIFNETMASK:
3413 case SIOCSIFNETMASK:
3414 case SIOCGIFDSTADDR:
3415 case SIOCSIFDSTADDR:
3417 return inet_dgram_ops.ioctl(sock, cmd, arg);
3421 return -ENOIOCTLCMD;
3426 static unsigned int packet_poll(struct file *file, struct socket *sock,
3429 struct sock *sk = sock->sk;
3430 struct packet_sock *po = pkt_sk(sk);
3431 unsigned int mask = datagram_poll(file, sock, wait);
3433 spin_lock_bh(&sk->sk_receive_queue.lock);
3434 if (po->rx_ring.pg_vec) {
3435 if (!packet_previous_rx_frame(po, &po->rx_ring,
3437 mask |= POLLIN | POLLRDNORM;
3439 spin_unlock_bh(&sk->sk_receive_queue.lock);
3440 spin_lock_bh(&sk->sk_write_queue.lock);
3441 if (po->tx_ring.pg_vec) {
3442 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
3443 mask |= POLLOUT | POLLWRNORM;
3445 spin_unlock_bh(&sk->sk_write_queue.lock);
3450 /* Dirty? Well, I still did not learn better way to account
3454 static void packet_mm_open(struct vm_area_struct *vma)
3456 struct file *file = vma->vm_file;
3457 struct socket *sock = file->private_data;
3458 struct sock *sk = sock->sk;
3461 atomic_inc(&pkt_sk(sk)->mapped);
3464 static void packet_mm_close(struct vm_area_struct *vma)
3466 struct file *file = vma->vm_file;
3467 struct socket *sock = file->private_data;
3468 struct sock *sk = sock->sk;
3471 atomic_dec(&pkt_sk(sk)->mapped);
3474 static const struct vm_operations_struct packet_mmap_ops = {
3475 .open = packet_mm_open,
3476 .close = packet_mm_close,
3479 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
3484 for (i = 0; i < len; i++) {
3485 if (likely(pg_vec[i].buffer)) {
3486 if (is_vmalloc_addr(pg_vec[i].buffer))
3487 vfree(pg_vec[i].buffer);
3489 free_pages((unsigned long)pg_vec[i].buffer,
3491 pg_vec[i].buffer = NULL;
3497 static char *alloc_one_pg_vec_page(unsigned long order)
3499 char *buffer = NULL;
3500 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
3501 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
3503 buffer = (char *) __get_free_pages(gfp_flags, order);
3509 * __get_free_pages failed, fall back to vmalloc
3511 buffer = vzalloc((1 << order) * PAGE_SIZE);
3517 * vmalloc failed, lets dig into swap here
3519 gfp_flags &= ~__GFP_NORETRY;
3520 buffer = (char *)__get_free_pages(gfp_flags, order);
3525 * complete and utter failure
3530 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
3532 unsigned int block_nr = req->tp_block_nr;
3536 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
3537 if (unlikely(!pg_vec))
3540 for (i = 0; i < block_nr; i++) {
3541 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
3542 if (unlikely(!pg_vec[i].buffer))
3543 goto out_free_pgvec;
3550 free_pg_vec(pg_vec, order, block_nr);
3555 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
3556 int closing, int tx_ring)
3558 struct pgv *pg_vec = NULL;
3559 struct packet_sock *po = pkt_sk(sk);
3560 int was_running, order = 0;
3561 struct packet_ring_buffer *rb;
3562 struct sk_buff_head *rb_queue;
3565 /* Added to avoid minimal code churn */
3566 struct tpacket_req *req = &req_u->req;
3568 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
3569 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
3570 WARN(1, "Tx-ring is not supported.\n");
3574 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
3575 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
3579 if (atomic_read(&po->mapped))
3581 if (atomic_read(&rb->pending))
3585 if (req->tp_block_nr) {
3586 /* Sanity tests and some calculations */
3588 if (unlikely(rb->pg_vec))
3591 switch (po->tp_version) {
3593 po->tp_hdrlen = TPACKET_HDRLEN;
3596 po->tp_hdrlen = TPACKET2_HDRLEN;
3599 po->tp_hdrlen = TPACKET3_HDRLEN;
3604 if (unlikely((int)req->tp_block_size <= 0))
3606 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
3608 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
3611 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
3614 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
3615 if (unlikely(rb->frames_per_block <= 0))
3617 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
3622 order = get_order(req->tp_block_size);
3623 pg_vec = alloc_pg_vec(req, order);
3624 if (unlikely(!pg_vec))
3626 switch (po->tp_version) {
3628 /* Transmit path is not supported. We checked
3629 * it above but just being paranoid
3632 init_prb_bdqc(po, rb, pg_vec, req_u, tx_ring);
3641 if (unlikely(req->tp_frame_nr))
3647 /* Detach socket from network */
3648 spin_lock(&po->bind_lock);
3649 was_running = po->running;
3653 __unregister_prot_hook(sk, false);
3655 spin_unlock(&po->bind_lock);
3660 mutex_lock(&po->pg_vec_lock);
3661 if (closing || atomic_read(&po->mapped) == 0) {
3663 spin_lock_bh(&rb_queue->lock);
3664 swap(rb->pg_vec, pg_vec);
3665 rb->frame_max = (req->tp_frame_nr - 1);
3667 rb->frame_size = req->tp_frame_size;
3668 spin_unlock_bh(&rb_queue->lock);
3670 swap(rb->pg_vec_order, order);
3671 swap(rb->pg_vec_len, req->tp_block_nr);
3673 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
3674 po->prot_hook.func = (po->rx_ring.pg_vec) ?
3675 tpacket_rcv : packet_rcv;
3676 skb_queue_purge(rb_queue);
3677 if (atomic_read(&po->mapped))
3678 pr_err("packet_mmap: vma is busy: %d\n",
3679 atomic_read(&po->mapped));
3681 mutex_unlock(&po->pg_vec_lock);
3683 spin_lock(&po->bind_lock);
3686 register_prot_hook(sk);
3688 spin_unlock(&po->bind_lock);
3689 if (closing && (po->tp_version > TPACKET_V2)) {
3690 /* Because we don't support block-based V3 on tx-ring */
3692 prb_shutdown_retire_blk_timer(po, tx_ring, rb_queue);
3697 free_pg_vec(pg_vec, order, req->tp_block_nr);
3702 static int packet_mmap(struct file *file, struct socket *sock,
3703 struct vm_area_struct *vma)
3705 struct sock *sk = sock->sk;
3706 struct packet_sock *po = pkt_sk(sk);
3707 unsigned long size, expected_size;
3708 struct packet_ring_buffer *rb;
3709 unsigned long start;
3716 mutex_lock(&po->pg_vec_lock);
3719 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
3721 expected_size += rb->pg_vec_len
3727 if (expected_size == 0)
3730 size = vma->vm_end - vma->vm_start;
3731 if (size != expected_size)
3734 start = vma->vm_start;
3735 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
3736 if (rb->pg_vec == NULL)
3739 for (i = 0; i < rb->pg_vec_len; i++) {
3741 void *kaddr = rb->pg_vec[i].buffer;
3744 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
3745 page = pgv_to_page(kaddr);
3746 err = vm_insert_page(vma, start, page);
3755 atomic_inc(&po->mapped);
3756 vma->vm_ops = &packet_mmap_ops;
3760 mutex_unlock(&po->pg_vec_lock);
3764 static const struct proto_ops packet_ops_spkt = {
3765 .family = PF_PACKET,
3766 .owner = THIS_MODULE,
3767 .release = packet_release,
3768 .bind = packet_bind_spkt,
3769 .connect = sock_no_connect,
3770 .socketpair = sock_no_socketpair,
3771 .accept = sock_no_accept,
3772 .getname = packet_getname_spkt,
3773 .poll = datagram_poll,
3774 .ioctl = packet_ioctl,
3775 .listen = sock_no_listen,
3776 .shutdown = sock_no_shutdown,
3777 .setsockopt = sock_no_setsockopt,
3778 .getsockopt = sock_no_getsockopt,
3779 .sendmsg = packet_sendmsg_spkt,
3780 .recvmsg = packet_recvmsg,
3781 .mmap = sock_no_mmap,
3782 .sendpage = sock_no_sendpage,
3785 static const struct proto_ops packet_ops = {
3786 .family = PF_PACKET,
3787 .owner = THIS_MODULE,
3788 .release = packet_release,
3789 .bind = packet_bind,
3790 .connect = sock_no_connect,
3791 .socketpair = sock_no_socketpair,
3792 .accept = sock_no_accept,
3793 .getname = packet_getname,
3794 .poll = packet_poll,
3795 .ioctl = packet_ioctl,
3796 .listen = sock_no_listen,
3797 .shutdown = sock_no_shutdown,
3798 .setsockopt = packet_setsockopt,
3799 .getsockopt = packet_getsockopt,
3800 .sendmsg = packet_sendmsg,
3801 .recvmsg = packet_recvmsg,
3802 .mmap = packet_mmap,
3803 .sendpage = sock_no_sendpage,
3806 static const struct net_proto_family packet_family_ops = {
3807 .family = PF_PACKET,
3808 .create = packet_create,
3809 .owner = THIS_MODULE,
3812 static struct notifier_block packet_netdev_notifier = {
3813 .notifier_call = packet_notifier,
3816 #ifdef CONFIG_PROC_FS
3818 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
3821 struct net *net = seq_file_net(seq);
3824 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
3827 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3829 struct net *net = seq_file_net(seq);
3830 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
3833 static void packet_seq_stop(struct seq_file *seq, void *v)
3839 static int packet_seq_show(struct seq_file *seq, void *v)
3841 if (v == SEQ_START_TOKEN)
3842 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
3844 struct sock *s = sk_entry(v);
3845 const struct packet_sock *po = pkt_sk(s);
3848 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
3850 atomic_read(&s->sk_refcnt),
3855 atomic_read(&s->sk_rmem_alloc),
3863 static const struct seq_operations packet_seq_ops = {
3864 .start = packet_seq_start,
3865 .next = packet_seq_next,
3866 .stop = packet_seq_stop,
3867 .show = packet_seq_show,
3870 static int packet_seq_open(struct inode *inode, struct file *file)
3872 return seq_open_net(inode, file, &packet_seq_ops,
3873 sizeof(struct seq_net_private));
3876 static const struct file_operations packet_seq_fops = {
3877 .owner = THIS_MODULE,
3878 .open = packet_seq_open,
3880 .llseek = seq_lseek,
3881 .release = seq_release_net,
3886 static int __net_init packet_net_init(struct net *net)
3888 spin_lock_init(&net->packet.sklist_lock);
3889 INIT_HLIST_HEAD(&net->packet.sklist);
3891 if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
3897 static void __net_exit packet_net_exit(struct net *net)
3899 proc_net_remove(net, "packet");
3902 static struct pernet_operations packet_net_ops = {
3903 .init = packet_net_init,
3904 .exit = packet_net_exit,
3908 static void __exit packet_exit(void)
3910 unregister_netdevice_notifier(&packet_netdev_notifier);
3911 unregister_pernet_subsys(&packet_net_ops);
3912 sock_unregister(PF_PACKET);
3913 proto_unregister(&packet_proto);
3916 static int __init packet_init(void)
3918 int rc = proto_register(&packet_proto, 0);
3923 sock_register(&packet_family_ops);
3924 register_pernet_subsys(&packet_net_ops);
3925 register_netdevice_notifier(&packet_netdev_notifier);
3930 module_init(packet_init);
3931 module_exit(packet_exit);
3932 MODULE_LICENSE("GPL");
3933 MODULE_ALIAS_NETPROTO(PF_PACKET);