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/uaccess.h>
77 #include <asm/ioctls.h>
79 #include <asm/cacheflush.h>
81 #include <linux/proc_fs.h>
82 #include <linux/seq_file.h>
83 #include <linux/poll.h>
84 #include <linux/module.h>
85 #include <linux/init.h>
86 #include <linux/mutex.h>
87 #include <linux/if_vlan.h>
88 #include <linux/virtio_net.h>
89 #include <linux/errqueue.h>
90 #include <linux/net_tstamp.h>
91 #include <linux/percpu.h>
93 #include <net/inet_common.h>
95 #include <linux/bpf.h>
101 - if device has no dev->hard_header routine, it adds and removes ll header
102 inside itself. In this case ll header is invisible outside of device,
103 but higher levels still should reserve dev->hard_header_len.
104 Some devices are enough clever to reallocate skb, when header
105 will not fit to reserved space (tunnel), another ones are silly
107 - packet socket receives packets with pulled ll header,
108 so that SOCK_RAW should push it back.
113 Incoming, dev->hard_header!=NULL
114 mac_header -> ll header
117 Outgoing, dev->hard_header!=NULL
118 mac_header -> ll header
121 Incoming, dev->hard_header==NULL
122 mac_header -> UNKNOWN position. It is very likely, that it points to ll
123 header. PPP makes it, that is wrong, because introduce
124 assymetry between rx and tx paths.
127 Outgoing, dev->hard_header==NULL
128 mac_header -> data. ll header is still not built!
132 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
138 dev->hard_header != NULL
139 mac_header -> ll header
142 dev->hard_header == NULL (ll header is added by device, we cannot control it)
146 We should set nh.raw on output to correct posistion,
147 packet classifier depends on it.
150 /* Private packet socket structures. */
152 /* identical to struct packet_mreq except it has
153 * a longer address field.
155 struct packet_mreq_max {
157 unsigned short mr_type;
158 unsigned short mr_alen;
159 unsigned char mr_address[MAX_ADDR_LEN];
163 struct tpacket_hdr *h1;
164 struct tpacket2_hdr *h2;
165 struct tpacket3_hdr *h3;
169 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
170 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 #define PGV_FROM_VMALLOC 1
181 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
182 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
183 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
184 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
185 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
186 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
187 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
190 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
191 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
192 struct packet_type *pt, struct net_device *orig_dev);
194 static void *packet_previous_frame(struct packet_sock *po,
195 struct packet_ring_buffer *rb,
197 static void packet_increment_head(struct packet_ring_buffer *buff);
198 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
199 struct tpacket_block_desc *);
200 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
201 struct packet_sock *);
202 static void prb_retire_current_block(struct tpacket_kbdq_core *,
203 struct packet_sock *, unsigned int status);
204 static int prb_queue_frozen(struct tpacket_kbdq_core *);
205 static void prb_open_block(struct tpacket_kbdq_core *,
206 struct tpacket_block_desc *);
207 static void prb_retire_rx_blk_timer_expired(unsigned long);
208 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
209 static void prb_init_blk_timer(struct packet_sock *,
210 struct tpacket_kbdq_core *,
211 void (*func) (unsigned long));
212 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
213 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
214 struct tpacket3_hdr *);
215 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
216 struct tpacket3_hdr *);
217 static void packet_flush_mclist(struct sock *sk);
219 struct packet_skb_cb {
221 struct sockaddr_pkt pkt;
223 /* Trick: alias skb original length with
224 * ll.sll_family and ll.protocol in order
227 unsigned int origlen;
228 struct sockaddr_ll ll;
233 #define vio_le() virtio_legacy_is_little_endian()
235 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
237 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
238 #define GET_PBLOCK_DESC(x, bid) \
239 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
240 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
241 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
242 #define GET_NEXT_PRB_BLK_NUM(x) \
243 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
244 ((x)->kactive_blk_num+1) : 0)
246 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
247 static void __fanout_link(struct sock *sk, struct packet_sock *po);
249 static int packet_direct_xmit(struct sk_buff *skb)
251 struct net_device *dev = skb->dev;
252 struct sk_buff *orig_skb = skb;
253 struct netdev_queue *txq;
254 int ret = NETDEV_TX_BUSY;
256 if (unlikely(!netif_running(dev) ||
257 !netif_carrier_ok(dev)))
260 skb = validate_xmit_skb_list(skb, dev);
264 txq = skb_get_tx_queue(dev, skb);
268 HARD_TX_LOCK(dev, txq, smp_processor_id());
269 if (!netif_xmit_frozen_or_drv_stopped(txq))
270 ret = netdev_start_xmit(skb, dev, txq, false);
271 HARD_TX_UNLOCK(dev, txq);
275 if (!dev_xmit_complete(ret))
280 atomic_long_inc(&dev->tx_dropped);
282 return NET_XMIT_DROP;
285 static struct net_device *packet_cached_dev_get(struct packet_sock *po)
287 struct net_device *dev;
290 dev = rcu_dereference(po->cached_dev);
298 static void packet_cached_dev_assign(struct packet_sock *po,
299 struct net_device *dev)
301 rcu_assign_pointer(po->cached_dev, dev);
304 static void packet_cached_dev_reset(struct packet_sock *po)
306 RCU_INIT_POINTER(po->cached_dev, NULL);
309 static bool packet_use_direct_xmit(const struct packet_sock *po)
311 return po->xmit == packet_direct_xmit;
314 static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
316 return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
319 static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
321 const struct net_device_ops *ops = dev->netdev_ops;
324 if (ops->ndo_select_queue) {
325 queue_index = ops->ndo_select_queue(dev, skb, NULL,
326 __packet_pick_tx_queue);
327 queue_index = netdev_cap_txqueue(dev, queue_index);
329 queue_index = __packet_pick_tx_queue(dev, skb);
332 skb_set_queue_mapping(skb, queue_index);
335 /* __register_prot_hook must be invoked through register_prot_hook
336 * or from a context in which asynchronous accesses to the packet
337 * socket is not possible (packet_create()).
339 static void __register_prot_hook(struct sock *sk)
341 struct packet_sock *po = pkt_sk(sk);
345 __fanout_link(sk, po);
347 dev_add_pack(&po->prot_hook);
354 static void register_prot_hook(struct sock *sk)
356 lockdep_assert_held_once(&pkt_sk(sk)->bind_lock);
357 __register_prot_hook(sk);
360 /* If the sync parameter is true, we will temporarily drop
361 * the po->bind_lock and do a synchronize_net to make sure no
362 * asynchronous packet processing paths still refer to the elements
363 * of po->prot_hook. If the sync parameter is false, it is the
364 * callers responsibility to take care of this.
366 static void __unregister_prot_hook(struct sock *sk, bool sync)
368 struct packet_sock *po = pkt_sk(sk);
370 lockdep_assert_held_once(&po->bind_lock);
375 __fanout_unlink(sk, po);
377 __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 struct page * __pure 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)
405 union tpacket_uhdr h;
408 switch (po->tp_version) {
410 h.h1->tp_status = status;
411 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
414 h.h2->tp_status = status;
415 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
419 WARN(1, "TPACKET version not supported.\n");
426 static int __packet_get_status(struct packet_sock *po, void *frame)
428 union tpacket_uhdr h;
433 switch (po->tp_version) {
435 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
436 return h.h1->tp_status;
438 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
439 return h.h2->tp_status;
442 WARN(1, "TPACKET version not supported.\n");
448 static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
451 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
454 (flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
455 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
456 return TP_STATUS_TS_RAW_HARDWARE;
458 if (ktime_to_timespec_cond(skb->tstamp, ts))
459 return TP_STATUS_TS_SOFTWARE;
464 static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
467 union tpacket_uhdr h;
471 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
475 switch (po->tp_version) {
477 h.h1->tp_sec = ts.tv_sec;
478 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
481 h.h2->tp_sec = ts.tv_sec;
482 h.h2->tp_nsec = ts.tv_nsec;
486 WARN(1, "TPACKET version not supported.\n");
490 /* one flush is safe, as both fields always lie on the same cacheline */
491 flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
497 static void *packet_lookup_frame(struct packet_sock *po,
498 struct packet_ring_buffer *rb,
499 unsigned int position,
502 unsigned int pg_vec_pos, frame_offset;
503 union tpacket_uhdr h;
505 pg_vec_pos = position / rb->frames_per_block;
506 frame_offset = position % rb->frames_per_block;
508 h.raw = rb->pg_vec[pg_vec_pos].buffer +
509 (frame_offset * rb->frame_size);
511 if (status != __packet_get_status(po, h.raw))
517 static void *packet_current_frame(struct packet_sock *po,
518 struct packet_ring_buffer *rb,
521 return packet_lookup_frame(po, rb, rb->head, status);
524 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
526 del_timer_sync(&pkc->retire_blk_timer);
529 static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
530 struct sk_buff_head *rb_queue)
532 struct tpacket_kbdq_core *pkc;
534 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
536 spin_lock_bh(&rb_queue->lock);
537 pkc->delete_blk_timer = 1;
538 spin_unlock_bh(&rb_queue->lock);
540 prb_del_retire_blk_timer(pkc);
543 static void prb_init_blk_timer(struct packet_sock *po,
544 struct tpacket_kbdq_core *pkc,
545 void (*func) (unsigned long))
547 init_timer(&pkc->retire_blk_timer);
548 pkc->retire_blk_timer.data = (long)po;
549 pkc->retire_blk_timer.function = func;
550 pkc->retire_blk_timer.expires = jiffies;
553 static void prb_setup_retire_blk_timer(struct packet_sock *po)
555 struct tpacket_kbdq_core *pkc;
557 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
558 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
561 static int prb_calc_retire_blk_tmo(struct packet_sock *po,
562 int blk_size_in_bytes)
564 struct net_device *dev;
565 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
566 struct ethtool_cmd ecmd;
571 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
572 if (unlikely(!dev)) {
574 return DEFAULT_PRB_RETIRE_TOV;
576 err = __ethtool_get_settings(dev, &ecmd);
577 speed = ethtool_cmd_speed(&ecmd);
581 * If the link speed is so slow you don't really
582 * need to worry about perf anyways
584 if (speed < SPEED_1000 || speed == SPEED_UNKNOWN) {
585 return DEFAULT_PRB_RETIRE_TOV;
591 return DEFAULT_PRB_RETIRE_TOV;
593 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
605 static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
606 union tpacket_req_u *req_u)
608 p1->feature_req_word = req_u->req3.tp_feature_req_word;
611 static void init_prb_bdqc(struct packet_sock *po,
612 struct packet_ring_buffer *rb,
614 union tpacket_req_u *req_u)
616 struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
617 struct tpacket_block_desc *pbd;
619 memset(p1, 0x0, sizeof(*p1));
621 p1->knxt_seq_num = 1;
623 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
624 p1->pkblk_start = pg_vec[0].buffer;
625 p1->kblk_size = req_u->req3.tp_block_size;
626 p1->knum_blocks = req_u->req3.tp_block_nr;
627 p1->hdrlen = po->tp_hdrlen;
628 p1->version = po->tp_version;
629 p1->last_kactive_blk_num = 0;
630 po->stats.stats3.tp_freeze_q_cnt = 0;
631 if (req_u->req3.tp_retire_blk_tov)
632 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
634 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
635 req_u->req3.tp_block_size);
636 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
637 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
639 p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
640 prb_init_ft_ops(p1, req_u);
641 prb_setup_retire_blk_timer(po);
642 prb_open_block(p1, pbd);
645 /* Do NOT update the last_blk_num first.
646 * Assumes sk_buff_head lock is held.
648 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
650 mod_timer(&pkc->retire_blk_timer,
651 jiffies + pkc->tov_in_jiffies);
652 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
657 * 1) We refresh the timer only when we open a block.
658 * By doing this we don't waste cycles refreshing the timer
659 * on packet-by-packet basis.
661 * With a 1MB block-size, on a 1Gbps line, it will take
662 * i) ~8 ms to fill a block + ii) memcpy etc.
663 * In this cut we are not accounting for the memcpy time.
665 * So, if the user sets the 'tmo' to 10ms then the timer
666 * will never fire while the block is still getting filled
667 * (which is what we want). However, the user could choose
668 * to close a block early and that's fine.
670 * But when the timer does fire, we check whether or not to refresh it.
671 * Since the tmo granularity is in msecs, it is not too expensive
672 * to refresh the timer, lets say every '8' msecs.
673 * Either the user can set the 'tmo' or we can derive it based on
674 * a) line-speed and b) block-size.
675 * prb_calc_retire_blk_tmo() calculates the tmo.
678 static void prb_retire_rx_blk_timer_expired(unsigned long data)
680 struct packet_sock *po = (struct packet_sock *)data;
681 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
683 struct tpacket_block_desc *pbd;
685 spin_lock(&po->sk.sk_receive_queue.lock);
687 frozen = prb_queue_frozen(pkc);
688 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
690 if (unlikely(pkc->delete_blk_timer))
693 /* We only need to plug the race when the block is partially filled.
695 * lock(); increment BLOCK_NUM_PKTS; unlock()
696 * copy_bits() is in progress ...
697 * timer fires on other cpu:
698 * we can't retire the current block because copy_bits
702 if (BLOCK_NUM_PKTS(pbd)) {
703 while (atomic_read(&pkc->blk_fill_in_prog)) {
704 /* Waiting for skb_copy_bits to finish... */
709 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
711 if (!BLOCK_NUM_PKTS(pbd)) {
712 /* An empty block. Just refresh the timer. */
715 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
716 if (!prb_dispatch_next_block(pkc, po))
721 /* Case 1. Queue was frozen because user-space was
724 if (prb_curr_blk_in_use(pkc, pbd)) {
726 * Ok, user-space is still behind.
727 * So just refresh the timer.
731 /* Case 2. queue was frozen,user-space caught up,
732 * now the link went idle && the timer fired.
733 * We don't have a block to close.So we open this
734 * block and restart the timer.
735 * opening a block thaws the queue,restarts timer
736 * Thawing/timer-refresh is a side effect.
738 prb_open_block(pkc, pbd);
745 _prb_refresh_rx_retire_blk_timer(pkc);
748 spin_unlock(&po->sk.sk_receive_queue.lock);
751 static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
752 struct tpacket_block_desc *pbd1, __u32 status)
754 /* Flush everything minus the block header */
756 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
761 /* Skip the block header(we know header WILL fit in 4K) */
764 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
765 for (; start < end; start += PAGE_SIZE)
766 flush_dcache_page(pgv_to_page(start));
771 /* Now update the block status. */
773 BLOCK_STATUS(pbd1) = status;
775 /* Flush the block header */
777 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
779 flush_dcache_page(pgv_to_page(start));
789 * 2) Increment active_blk_num
791 * Note:We DONT refresh the timer on purpose.
792 * Because almost always the next block will be opened.
794 static void prb_close_block(struct tpacket_kbdq_core *pkc1,
795 struct tpacket_block_desc *pbd1,
796 struct packet_sock *po, unsigned int stat)
798 __u32 status = TP_STATUS_USER | stat;
800 struct tpacket3_hdr *last_pkt;
801 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
802 struct sock *sk = &po->sk;
804 if (po->stats.stats3.tp_drops)
805 status |= TP_STATUS_LOSING;
807 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
808 last_pkt->tp_next_offset = 0;
810 /* Get the ts of the last pkt */
811 if (BLOCK_NUM_PKTS(pbd1)) {
812 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
813 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
815 /* Ok, we tmo'd - so get the current time.
817 * It shouldn't really happen as we don't close empty
818 * blocks. See prb_retire_rx_blk_timer_expired().
822 h1->ts_last_pkt.ts_sec = ts.tv_sec;
823 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
828 /* Flush the block */
829 prb_flush_block(pkc1, pbd1, status);
831 sk->sk_data_ready(sk);
833 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
836 static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
838 pkc->reset_pending_on_curr_blk = 0;
842 * Side effect of opening a block:
844 * 1) prb_queue is thawed.
845 * 2) retire_blk_timer is refreshed.
848 static void prb_open_block(struct tpacket_kbdq_core *pkc1,
849 struct tpacket_block_desc *pbd1)
852 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
856 /* We could have just memset this but we will lose the
857 * flexibility of making the priv area sticky
860 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
861 BLOCK_NUM_PKTS(pbd1) = 0;
862 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
866 h1->ts_first_pkt.ts_sec = ts.tv_sec;
867 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
869 pkc1->pkblk_start = (char *)pbd1;
870 pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
872 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
873 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
875 pbd1->version = pkc1->version;
876 pkc1->prev = pkc1->nxt_offset;
877 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
879 prb_thaw_queue(pkc1);
880 _prb_refresh_rx_retire_blk_timer(pkc1);
886 * Queue freeze logic:
887 * 1) Assume tp_block_nr = 8 blocks.
888 * 2) At time 't0', user opens Rx ring.
889 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
890 * 4) user-space is either sleeping or processing block '0'.
891 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
892 * it will close block-7,loop around and try to fill block '0'.
894 * __packet_lookup_frame_in_block
895 * prb_retire_current_block()
896 * prb_dispatch_next_block()
897 * |->(BLOCK_STATUS == USER) evaluates to true
898 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
899 * 6) Now there are two cases:
900 * 6.1) Link goes idle right after the queue is frozen.
901 * But remember, the last open_block() refreshed the timer.
902 * When this timer expires,it will refresh itself so that we can
903 * re-open block-0 in near future.
904 * 6.2) Link is busy and keeps on receiving packets. This is a simple
905 * case and __packet_lookup_frame_in_block will check if block-0
906 * is free and can now be re-used.
908 static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
909 struct packet_sock *po)
911 pkc->reset_pending_on_curr_blk = 1;
912 po->stats.stats3.tp_freeze_q_cnt++;
915 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
918 * If the next block is free then we will dispatch it
919 * and return a good offset.
920 * Else, we will freeze the queue.
921 * So, caller must check the return value.
923 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
924 struct packet_sock *po)
926 struct tpacket_block_desc *pbd;
930 /* 1. Get current block num */
931 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
933 /* 2. If this block is currently in_use then freeze the queue */
934 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
935 prb_freeze_queue(pkc, po);
941 * open this block and return the offset where the first packet
942 * needs to get stored.
944 prb_open_block(pkc, pbd);
945 return (void *)pkc->nxt_offset;
948 static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
949 struct packet_sock *po, unsigned int status)
951 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
953 /* retire/close the current block */
954 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
956 * Plug the case where copy_bits() is in progress on
957 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
958 * have space to copy the pkt in the current block and
959 * called prb_retire_current_block()
961 * We don't need to worry about the TMO case because
962 * the timer-handler already handled this case.
964 if (!(status & TP_STATUS_BLK_TMO)) {
965 while (atomic_read(&pkc->blk_fill_in_prog)) {
966 /* Waiting for skb_copy_bits to finish... */
970 prb_close_block(pkc, pbd, po, status);
975 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
976 struct tpacket_block_desc *pbd)
978 return TP_STATUS_USER & BLOCK_STATUS(pbd);
981 static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
983 return pkc->reset_pending_on_curr_blk;
986 static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
988 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
989 atomic_dec(&pkc->blk_fill_in_prog);
992 static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
993 struct tpacket3_hdr *ppd)
995 ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
998 static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
999 struct tpacket3_hdr *ppd)
1001 ppd->hv1.tp_rxhash = 0;
1004 static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
1005 struct tpacket3_hdr *ppd)
1007 if (skb_vlan_tag_present(pkc->skb)) {
1008 ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
1009 ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
1010 ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
1012 ppd->hv1.tp_vlan_tci = 0;
1013 ppd->hv1.tp_vlan_tpid = 0;
1014 ppd->tp_status = TP_STATUS_AVAILABLE;
1018 static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
1019 struct tpacket3_hdr *ppd)
1021 ppd->hv1.tp_padding = 0;
1022 prb_fill_vlan_info(pkc, ppd);
1024 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
1025 prb_fill_rxhash(pkc, ppd);
1027 prb_clear_rxhash(pkc, ppd);
1030 static void prb_fill_curr_block(char *curr,
1031 struct tpacket_kbdq_core *pkc,
1032 struct tpacket_block_desc *pbd,
1035 struct tpacket3_hdr *ppd;
1037 ppd = (struct tpacket3_hdr *)curr;
1038 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1040 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1041 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1042 BLOCK_NUM_PKTS(pbd) += 1;
1043 atomic_inc(&pkc->blk_fill_in_prog);
1044 prb_run_all_ft_ops(pkc, ppd);
1047 /* Assumes caller has the sk->rx_queue.lock */
1048 static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1049 struct sk_buff *skb,
1054 struct tpacket_kbdq_core *pkc;
1055 struct tpacket_block_desc *pbd;
1058 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
1059 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1061 /* Queue is frozen when user space is lagging behind */
1062 if (prb_queue_frozen(pkc)) {
1064 * Check if that last block which caused the queue to freeze,
1065 * is still in_use by user-space.
1067 if (prb_curr_blk_in_use(pkc, pbd)) {
1068 /* Can't record this packet */
1072 * Ok, the block was released by user-space.
1073 * Now let's open that block.
1074 * opening a block also thaws the queue.
1075 * Thawing is a side effect.
1077 prb_open_block(pkc, pbd);
1082 curr = pkc->nxt_offset;
1084 end = (char *)pbd + pkc->kblk_size;
1086 /* first try the current block */
1087 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1088 prb_fill_curr_block(curr, pkc, pbd, len);
1089 return (void *)curr;
1092 /* Ok, close the current block */
1093 prb_retire_current_block(pkc, po, 0);
1095 /* Now, try to dispatch the next block */
1096 curr = (char *)prb_dispatch_next_block(pkc, po);
1098 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1099 prb_fill_curr_block(curr, pkc, pbd, len);
1100 return (void *)curr;
1104 * No free blocks are available.user_space hasn't caught up yet.
1105 * Queue was just frozen and now this packet will get dropped.
1110 static void *packet_current_rx_frame(struct packet_sock *po,
1111 struct sk_buff *skb,
1112 int status, unsigned int len)
1115 switch (po->tp_version) {
1118 curr = packet_lookup_frame(po, &po->rx_ring,
1119 po->rx_ring.head, status);
1122 return __packet_lookup_frame_in_block(po, skb, status, len);
1124 WARN(1, "TPACKET version not supported\n");
1130 static void *prb_lookup_block(struct packet_sock *po,
1131 struct packet_ring_buffer *rb,
1135 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1136 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
1138 if (status != BLOCK_STATUS(pbd))
1143 static int prb_previous_blk_num(struct packet_ring_buffer *rb)
1146 if (rb->prb_bdqc.kactive_blk_num)
1147 prev = rb->prb_bdqc.kactive_blk_num-1;
1149 prev = rb->prb_bdqc.knum_blocks-1;
1153 /* Assumes caller has held the rx_queue.lock */
1154 static void *__prb_previous_block(struct packet_sock *po,
1155 struct packet_ring_buffer *rb,
1158 unsigned int previous = prb_previous_blk_num(rb);
1159 return prb_lookup_block(po, rb, previous, status);
1162 static void *packet_previous_rx_frame(struct packet_sock *po,
1163 struct packet_ring_buffer *rb,
1166 if (po->tp_version <= TPACKET_V2)
1167 return packet_previous_frame(po, rb, status);
1169 return __prb_previous_block(po, rb, status);
1172 static void packet_increment_rx_head(struct packet_sock *po,
1173 struct packet_ring_buffer *rb)
1175 switch (po->tp_version) {
1178 return packet_increment_head(rb);
1181 WARN(1, "TPACKET version not supported.\n");
1187 static void *packet_previous_frame(struct packet_sock *po,
1188 struct packet_ring_buffer *rb,
1191 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1192 return packet_lookup_frame(po, rb, previous, status);
1195 static void packet_increment_head(struct packet_ring_buffer *buff)
1197 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1200 static void packet_inc_pending(struct packet_ring_buffer *rb)
1202 this_cpu_inc(*rb->pending_refcnt);
1205 static void packet_dec_pending(struct packet_ring_buffer *rb)
1207 this_cpu_dec(*rb->pending_refcnt);
1210 static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
1212 unsigned int refcnt = 0;
1215 /* We don't use pending refcount in rx_ring. */
1216 if (rb->pending_refcnt == NULL)
1219 for_each_possible_cpu(cpu)
1220 refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
1225 static int packet_alloc_pending(struct packet_sock *po)
1227 po->rx_ring.pending_refcnt = NULL;
1229 po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
1230 if (unlikely(po->tx_ring.pending_refcnt == NULL))
1236 static void packet_free_pending(struct packet_sock *po)
1238 free_percpu(po->tx_ring.pending_refcnt);
1241 #define ROOM_POW_OFF 2
1242 #define ROOM_NONE 0x0
1243 #define ROOM_LOW 0x1
1244 #define ROOM_NORMAL 0x2
1246 static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
1250 len = po->rx_ring.frame_max + 1;
1251 idx = po->rx_ring.head;
1253 idx += len >> pow_off;
1256 return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1259 static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
1263 len = po->rx_ring.prb_bdqc.knum_blocks;
1264 idx = po->rx_ring.prb_bdqc.kactive_blk_num;
1266 idx += len >> pow_off;
1269 return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1272 static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1274 struct sock *sk = &po->sk;
1275 int ret = ROOM_NONE;
1277 if (po->prot_hook.func != tpacket_rcv) {
1278 int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
1279 - (skb ? skb->truesize : 0);
1280 if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
1288 if (po->tp_version == TPACKET_V3) {
1289 if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
1291 else if (__tpacket_v3_has_room(po, 0))
1294 if (__tpacket_has_room(po, ROOM_POW_OFF))
1296 else if (__tpacket_has_room(po, 0))
1303 static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1308 spin_lock_bh(&po->sk.sk_receive_queue.lock);
1309 ret = __packet_rcv_has_room(po, skb);
1310 has_room = ret == ROOM_NORMAL;
1311 if (po->pressure == has_room)
1312 po->pressure = !has_room;
1313 spin_unlock_bh(&po->sk.sk_receive_queue.lock);
1318 static void packet_sock_destruct(struct sock *sk)
1320 skb_queue_purge(&sk->sk_error_queue);
1322 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1323 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1325 if (!sock_flag(sk, SOCK_DEAD)) {
1326 pr_err("Attempt to release alive packet socket: %p\n", sk);
1330 sk_refcnt_debug_dec(sk);
1333 static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
1335 u32 *history = po->rollover->history;
1339 rxhash = skb_get_hash(skb);
1340 for (i = 0; i < ROLLOVER_HLEN; i++)
1341 if (READ_ONCE(history[i]) == rxhash)
1344 victim = prandom_u32() % ROLLOVER_HLEN;
1346 /* Avoid dirtying the cache line if possible */
1347 if (READ_ONCE(history[victim]) != rxhash)
1348 WRITE_ONCE(history[victim], rxhash);
1350 return count > (ROLLOVER_HLEN >> 1);
1353 static unsigned int fanout_demux_hash(struct packet_fanout *f,
1354 struct sk_buff *skb,
1357 return reciprocal_scale(__skb_get_hash_symmetric(skb), num);
1360 static unsigned int fanout_demux_lb(struct packet_fanout *f,
1361 struct sk_buff *skb,
1364 unsigned int val = atomic_inc_return(&f->rr_cur);
1369 static unsigned int fanout_demux_cpu(struct packet_fanout *f,
1370 struct sk_buff *skb,
1373 return smp_processor_id() % num;
1376 static unsigned int fanout_demux_rnd(struct packet_fanout *f,
1377 struct sk_buff *skb,
1380 return prandom_u32_max(num);
1383 static unsigned int fanout_demux_rollover(struct packet_fanout *f,
1384 struct sk_buff *skb,
1385 unsigned int idx, bool try_self,
1388 struct packet_sock *po, *po_next, *po_skip = NULL;
1389 unsigned int i, j, room = ROOM_NONE;
1391 po = pkt_sk(f->arr[idx]);
1394 room = packet_rcv_has_room(po, skb);
1395 if (room == ROOM_NORMAL ||
1396 (room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
1401 i = j = min_t(int, po->rollover->sock, num - 1);
1403 po_next = pkt_sk(f->arr[i]);
1404 if (po_next != po_skip && !po_next->pressure &&
1405 packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
1407 po->rollover->sock = i;
1408 atomic_long_inc(&po->rollover->num);
1409 if (room == ROOM_LOW)
1410 atomic_long_inc(&po->rollover->num_huge);
1418 atomic_long_inc(&po->rollover->num_failed);
1422 static unsigned int fanout_demux_qm(struct packet_fanout *f,
1423 struct sk_buff *skb,
1426 return skb_get_queue_mapping(skb) % num;
1429 static unsigned int fanout_demux_bpf(struct packet_fanout *f,
1430 struct sk_buff *skb,
1433 struct bpf_prog *prog;
1434 unsigned int ret = 0;
1437 prog = rcu_dereference(f->bpf_prog);
1439 ret = bpf_prog_run_clear_cb(prog, skb) % num;
1445 static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
1447 return f->flags & (flag >> 8);
1450 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1451 struct packet_type *pt, struct net_device *orig_dev)
1453 struct packet_fanout *f = pt->af_packet_priv;
1454 unsigned int num = READ_ONCE(f->num_members);
1455 struct net *net = read_pnet(&f->net);
1456 struct packet_sock *po;
1459 if (!net_eq(dev_net(dev), net) || !num) {
1464 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
1465 skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET);
1470 case PACKET_FANOUT_HASH:
1472 idx = fanout_demux_hash(f, skb, num);
1474 case PACKET_FANOUT_LB:
1475 idx = fanout_demux_lb(f, skb, num);
1477 case PACKET_FANOUT_CPU:
1478 idx = fanout_demux_cpu(f, skb, num);
1480 case PACKET_FANOUT_RND:
1481 idx = fanout_demux_rnd(f, skb, num);
1483 case PACKET_FANOUT_QM:
1484 idx = fanout_demux_qm(f, skb, num);
1486 case PACKET_FANOUT_ROLLOVER:
1487 idx = fanout_demux_rollover(f, skb, 0, false, num);
1489 case PACKET_FANOUT_CBPF:
1490 case PACKET_FANOUT_EBPF:
1491 idx = fanout_demux_bpf(f, skb, num);
1495 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
1496 idx = fanout_demux_rollover(f, skb, idx, true, num);
1498 po = pkt_sk(f->arr[idx]);
1499 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1502 DEFINE_MUTEX(fanout_mutex);
1503 EXPORT_SYMBOL_GPL(fanout_mutex);
1504 static LIST_HEAD(fanout_list);
1506 static void __fanout_link(struct sock *sk, struct packet_sock *po)
1508 struct packet_fanout *f = po->fanout;
1510 spin_lock(&f->lock);
1511 f->arr[f->num_members] = sk;
1514 if (f->num_members == 1)
1515 dev_add_pack(&f->prot_hook);
1516 spin_unlock(&f->lock);
1519 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1521 struct packet_fanout *f = po->fanout;
1524 spin_lock(&f->lock);
1525 for (i = 0; i < f->num_members; i++) {
1526 if (f->arr[i] == sk)
1529 BUG_ON(i >= f->num_members);
1530 f->arr[i] = f->arr[f->num_members - 1];
1532 if (f->num_members == 0)
1533 __dev_remove_pack(&f->prot_hook);
1534 spin_unlock(&f->lock);
1537 static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
1539 if (sk->sk_family != PF_PACKET)
1542 return ptype->af_packet_priv == pkt_sk(sk)->fanout;
1545 static void fanout_init_data(struct packet_fanout *f)
1548 case PACKET_FANOUT_LB:
1549 atomic_set(&f->rr_cur, 0);
1551 case PACKET_FANOUT_CBPF:
1552 case PACKET_FANOUT_EBPF:
1553 RCU_INIT_POINTER(f->bpf_prog, NULL);
1558 static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
1560 struct bpf_prog *old;
1562 spin_lock(&f->lock);
1563 old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
1564 rcu_assign_pointer(f->bpf_prog, new);
1565 spin_unlock(&f->lock);
1569 bpf_prog_destroy(old);
1573 static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
1576 struct bpf_prog *new;
1577 struct sock_fprog fprog;
1580 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1582 if (len != sizeof(fprog))
1584 if (copy_from_user(&fprog, data, len))
1587 ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
1591 __fanout_set_data_bpf(po->fanout, new);
1595 static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
1598 struct bpf_prog *new;
1601 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1603 if (len != sizeof(fd))
1605 if (copy_from_user(&fd, data, len))
1608 new = bpf_prog_get(fd);
1610 return PTR_ERR(new);
1611 if (new->type != BPF_PROG_TYPE_SOCKET_FILTER) {
1616 __fanout_set_data_bpf(po->fanout, new);
1620 static int fanout_set_data(struct packet_sock *po, char __user *data,
1623 switch (po->fanout->type) {
1624 case PACKET_FANOUT_CBPF:
1625 return fanout_set_data_cbpf(po, data, len);
1626 case PACKET_FANOUT_EBPF:
1627 return fanout_set_data_ebpf(po, data, len);
1633 static void fanout_release_data(struct packet_fanout *f)
1636 case PACKET_FANOUT_CBPF:
1637 case PACKET_FANOUT_EBPF:
1638 __fanout_set_data_bpf(f, NULL);
1642 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
1644 struct packet_rollover *rollover = NULL;
1645 struct packet_sock *po = pkt_sk(sk);
1646 struct packet_fanout *f, *match;
1647 u8 type = type_flags & 0xff;
1648 u8 flags = type_flags >> 8;
1652 case PACKET_FANOUT_ROLLOVER:
1653 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1655 case PACKET_FANOUT_HASH:
1656 case PACKET_FANOUT_LB:
1657 case PACKET_FANOUT_CPU:
1658 case PACKET_FANOUT_RND:
1659 case PACKET_FANOUT_QM:
1660 case PACKET_FANOUT_CBPF:
1661 case PACKET_FANOUT_EBPF:
1667 mutex_lock(&fanout_mutex);
1673 if (type == PACKET_FANOUT_ROLLOVER ||
1674 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1676 rollover = kzalloc(sizeof(*rollover), GFP_KERNEL);
1679 atomic_long_set(&rollover->num, 0);
1680 atomic_long_set(&rollover->num_huge, 0);
1681 atomic_long_set(&rollover->num_failed, 0);
1685 list_for_each_entry(f, &fanout_list, list) {
1687 read_pnet(&f->net) == sock_net(sk)) {
1693 if (match && match->flags != flags)
1697 match = kzalloc(sizeof(*match), GFP_KERNEL);
1700 write_pnet(&match->net, sock_net(sk));
1703 match->flags = flags;
1704 INIT_LIST_HEAD(&match->list);
1705 spin_lock_init(&match->lock);
1706 atomic_set(&match->sk_ref, 0);
1707 fanout_init_data(match);
1708 match->prot_hook.type = po->prot_hook.type;
1709 match->prot_hook.dev = po->prot_hook.dev;
1710 match->prot_hook.func = packet_rcv_fanout;
1711 match->prot_hook.af_packet_priv = match;
1712 match->prot_hook.id_match = match_fanout_group;
1713 list_add(&match->list, &fanout_list);
1717 spin_lock(&po->bind_lock);
1719 match->type == type &&
1720 match->prot_hook.type == po->prot_hook.type &&
1721 match->prot_hook.dev == po->prot_hook.dev) {
1723 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1724 __dev_remove_pack(&po->prot_hook);
1726 po->rollover = rollover;
1728 atomic_inc(&match->sk_ref);
1729 __fanout_link(sk, po);
1733 spin_unlock(&po->bind_lock);
1735 if (err && !atomic_read(&match->sk_ref)) {
1736 list_del(&match->list);
1742 mutex_unlock(&fanout_mutex);
1746 /* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes
1747 * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout.
1748 * It is the responsibility of the caller to call fanout_release_data() and
1749 * free the returned packet_fanout (after synchronize_net())
1751 static struct packet_fanout *fanout_release(struct sock *sk)
1753 struct packet_sock *po = pkt_sk(sk);
1754 struct packet_fanout *f;
1756 mutex_lock(&fanout_mutex);
1761 if (atomic_dec_and_test(&f->sk_ref))
1766 mutex_unlock(&fanout_mutex);
1771 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1772 struct sk_buff *skb)
1774 /* Earlier code assumed this would be a VLAN pkt, double-check
1775 * this now that we have the actual packet in hand. We can only
1776 * do this check on Ethernet devices.
1778 if (unlikely(dev->type != ARPHRD_ETHER))
1781 skb_reset_mac_header(skb);
1782 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1785 static const struct proto_ops packet_ops;
1787 static const struct proto_ops packet_ops_spkt;
1789 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1790 struct packet_type *pt, struct net_device *orig_dev)
1793 struct sockaddr_pkt *spkt;
1796 * When we registered the protocol we saved the socket in the data
1797 * field for just this event.
1800 sk = pt->af_packet_priv;
1803 * Yank back the headers [hope the device set this
1804 * right or kerboom...]
1806 * Incoming packets have ll header pulled,
1809 * For outgoing ones skb->data == skb_mac_header(skb)
1810 * so that this procedure is noop.
1813 if (skb->pkt_type == PACKET_LOOPBACK)
1816 if (!net_eq(dev_net(dev), sock_net(sk)))
1819 skb = skb_share_check(skb, GFP_ATOMIC);
1823 /* drop any routing info */
1826 /* drop conntrack reference */
1829 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1831 skb_push(skb, skb->data - skb_mac_header(skb));
1834 * The SOCK_PACKET socket receives _all_ frames.
1837 spkt->spkt_family = dev->type;
1838 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1839 spkt->spkt_protocol = skb->protocol;
1842 * Charge the memory to the socket. This is done specifically
1843 * to prevent sockets using all the memory up.
1846 if (sock_queue_rcv_skb(sk, skb) == 0)
1857 * Output a raw packet to a device layer. This bypasses all the other
1858 * protocol layers and you must therefore supply it with a complete frame
1861 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1864 struct sock *sk = sock->sk;
1865 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1866 struct sk_buff *skb = NULL;
1867 struct net_device *dev;
1873 * Get and verify the address.
1877 if (msg->msg_namelen < sizeof(struct sockaddr))
1879 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1880 proto = saddr->spkt_protocol;
1882 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1885 * Find the device first to size check it
1888 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1891 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1897 if (!(dev->flags & IFF_UP))
1901 * You may not queue a frame bigger than the mtu. This is the lowest level
1902 * raw protocol and you must do your own fragmentation at this level.
1905 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1906 if (!netif_supports_nofcs(dev)) {
1907 err = -EPROTONOSUPPORT;
1910 extra_len = 4; /* We're doing our own CRC */
1914 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1918 size_t reserved = LL_RESERVED_SPACE(dev);
1919 int tlen = dev->needed_tailroom;
1920 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1923 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1926 /* FIXME: Save some space for broken drivers that write a hard
1927 * header at transmission time by themselves. PPP is the notable
1928 * one here. This should really be fixed at the driver level.
1930 skb_reserve(skb, reserved);
1931 skb_reset_network_header(skb);
1933 /* Try to align data part correctly */
1938 skb_reset_network_header(skb);
1940 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1946 if (!dev_validate_header(dev, skb->data, len)) {
1950 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1951 !packet_extra_vlan_len_allowed(dev, skb)) {
1956 skb->protocol = proto;
1958 skb->priority = sk->sk_priority;
1959 skb->mark = sk->sk_mark;
1961 sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1963 if (unlikely(extra_len == 4))
1966 skb_probe_transport_header(skb, 0);
1968 dev_queue_xmit(skb);
1979 static unsigned int run_filter(struct sk_buff *skb,
1980 const struct sock *sk,
1983 struct sk_filter *filter;
1986 filter = rcu_dereference(sk->sk_filter);
1988 res = bpf_prog_run_clear_cb(filter->prog, skb);
1995 * This function makes lazy skb cloning in hope that most of packets
1996 * are discarded by BPF.
1998 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1999 * and skb->cb are mangled. It works because (and until) packets
2000 * falling here are owned by current CPU. Output packets are cloned
2001 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2002 * sequencially, so that if we return skb to original state on exit,
2003 * we will not harm anyone.
2006 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2007 struct packet_type *pt, struct net_device *orig_dev)
2010 struct sockaddr_ll *sll;
2011 struct packet_sock *po;
2012 u8 *skb_head = skb->data;
2013 int skb_len = skb->len;
2014 unsigned int snaplen, res;
2016 if (skb->pkt_type == PACKET_LOOPBACK)
2019 sk = pt->af_packet_priv;
2022 if (!net_eq(dev_net(dev), sock_net(sk)))
2027 if (dev->header_ops) {
2028 /* The device has an explicit notion of ll header,
2029 * exported to higher levels.
2031 * Otherwise, the device hides details of its frame
2032 * structure, so that corresponding packet head is
2033 * never delivered to user.
2035 if (sk->sk_type != SOCK_DGRAM)
2036 skb_push(skb, skb->data - skb_mac_header(skb));
2037 else if (skb->pkt_type == PACKET_OUTGOING) {
2038 /* Special case: outgoing packets have ll header at head */
2039 skb_pull(skb, skb_network_offset(skb));
2045 res = run_filter(skb, sk, snaplen);
2047 goto drop_n_restore;
2051 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2054 if (skb_shared(skb)) {
2055 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2059 if (skb_head != skb->data) {
2060 skb->data = skb_head;
2067 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2069 sll = &PACKET_SKB_CB(skb)->sa.ll;
2070 sll->sll_hatype = dev->type;
2071 sll->sll_pkttype = skb->pkt_type;
2072 if (unlikely(po->origdev))
2073 sll->sll_ifindex = orig_dev->ifindex;
2075 sll->sll_ifindex = dev->ifindex;
2077 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2079 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2080 * Use their space for storing the original skb length.
2082 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2084 if (pskb_trim(skb, snaplen))
2087 skb_set_owner_r(skb, sk);
2091 /* drop conntrack reference */
2094 spin_lock(&sk->sk_receive_queue.lock);
2095 po->stats.stats1.tp_packets++;
2096 sock_skb_set_dropcount(sk, skb);
2097 __skb_queue_tail(&sk->sk_receive_queue, skb);
2098 spin_unlock(&sk->sk_receive_queue.lock);
2099 sk->sk_data_ready(sk);
2103 spin_lock(&sk->sk_receive_queue.lock);
2104 po->stats.stats1.tp_drops++;
2105 atomic_inc(&sk->sk_drops);
2106 spin_unlock(&sk->sk_receive_queue.lock);
2109 if (skb_head != skb->data && skb_shared(skb)) {
2110 skb->data = skb_head;
2118 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2119 struct packet_type *pt, struct net_device *orig_dev)
2122 struct packet_sock *po;
2123 struct sockaddr_ll *sll;
2124 union tpacket_uhdr h;
2125 u8 *skb_head = skb->data;
2126 int skb_len = skb->len;
2127 unsigned int snaplen, res;
2128 unsigned long status = TP_STATUS_USER;
2129 unsigned short macoff, netoff, hdrlen;
2130 struct sk_buff *copy_skb = NULL;
2134 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2135 * We may add members to them until current aligned size without forcing
2136 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2138 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2139 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2141 if (skb->pkt_type == PACKET_LOOPBACK)
2144 sk = pt->af_packet_priv;
2147 if (!net_eq(dev_net(dev), sock_net(sk)))
2150 if (dev->header_ops) {
2151 if (sk->sk_type != SOCK_DGRAM)
2152 skb_push(skb, skb->data - skb_mac_header(skb));
2153 else if (skb->pkt_type == PACKET_OUTGOING) {
2154 /* Special case: outgoing packets have ll header at head */
2155 skb_pull(skb, skb_network_offset(skb));
2161 res = run_filter(skb, sk, snaplen);
2163 goto drop_n_restore;
2165 if (skb->ip_summed == CHECKSUM_PARTIAL)
2166 status |= TP_STATUS_CSUMNOTREADY;
2167 else if (skb->pkt_type != PACKET_OUTGOING &&
2168 (skb->ip_summed == CHECKSUM_COMPLETE ||
2169 skb_csum_unnecessary(skb)))
2170 status |= TP_STATUS_CSUM_VALID;
2175 if (sk->sk_type == SOCK_DGRAM) {
2176 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2179 unsigned int maclen = skb_network_offset(skb);
2180 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2181 (maclen < 16 ? 16 : maclen)) +
2183 macoff = netoff - maclen;
2185 if (po->tp_version <= TPACKET_V2) {
2186 if (macoff + snaplen > po->rx_ring.frame_size) {
2187 if (po->copy_thresh &&
2188 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2189 if (skb_shared(skb)) {
2190 copy_skb = skb_clone(skb, GFP_ATOMIC);
2192 copy_skb = skb_get(skb);
2193 skb_head = skb->data;
2196 skb_set_owner_r(copy_skb, sk);
2198 snaplen = po->rx_ring.frame_size - macoff;
2199 if ((int)snaplen < 0)
2202 } else if (unlikely(macoff + snaplen >
2203 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2206 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2207 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2208 snaplen, nval, macoff);
2210 if (unlikely((int)snaplen < 0)) {
2212 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2215 spin_lock(&sk->sk_receive_queue.lock);
2216 h.raw = packet_current_rx_frame(po, skb,
2217 TP_STATUS_KERNEL, (macoff+snaplen));
2220 if (po->tp_version <= TPACKET_V2) {
2221 packet_increment_rx_head(po, &po->rx_ring);
2223 * LOSING will be reported till you read the stats,
2224 * because it's COR - Clear On Read.
2225 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2228 if (po->stats.stats1.tp_drops)
2229 status |= TP_STATUS_LOSING;
2231 po->stats.stats1.tp_packets++;
2233 status |= TP_STATUS_COPY;
2234 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2236 spin_unlock(&sk->sk_receive_queue.lock);
2238 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2240 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2241 getnstimeofday(&ts);
2243 status |= ts_status;
2245 switch (po->tp_version) {
2247 h.h1->tp_len = skb->len;
2248 h.h1->tp_snaplen = snaplen;
2249 h.h1->tp_mac = macoff;
2250 h.h1->tp_net = netoff;
2251 h.h1->tp_sec = ts.tv_sec;
2252 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2253 hdrlen = sizeof(*h.h1);
2256 h.h2->tp_len = skb->len;
2257 h.h2->tp_snaplen = snaplen;
2258 h.h2->tp_mac = macoff;
2259 h.h2->tp_net = netoff;
2260 h.h2->tp_sec = ts.tv_sec;
2261 h.h2->tp_nsec = ts.tv_nsec;
2262 if (skb_vlan_tag_present(skb)) {
2263 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2264 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2265 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2267 h.h2->tp_vlan_tci = 0;
2268 h.h2->tp_vlan_tpid = 0;
2270 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2271 hdrlen = sizeof(*h.h2);
2274 /* tp_nxt_offset,vlan are already populated above.
2275 * So DONT clear those fields here
2277 h.h3->tp_status |= status;
2278 h.h3->tp_len = skb->len;
2279 h.h3->tp_snaplen = snaplen;
2280 h.h3->tp_mac = macoff;
2281 h.h3->tp_net = netoff;
2282 h.h3->tp_sec = ts.tv_sec;
2283 h.h3->tp_nsec = ts.tv_nsec;
2284 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2285 hdrlen = sizeof(*h.h3);
2291 sll = h.raw + TPACKET_ALIGN(hdrlen);
2292 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2293 sll->sll_family = AF_PACKET;
2294 sll->sll_hatype = dev->type;
2295 sll->sll_protocol = skb->protocol;
2296 sll->sll_pkttype = skb->pkt_type;
2297 if (unlikely(po->origdev))
2298 sll->sll_ifindex = orig_dev->ifindex;
2300 sll->sll_ifindex = dev->ifindex;
2304 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2305 if (po->tp_version <= TPACKET_V2) {
2308 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2311 for (start = h.raw; start < end; start += PAGE_SIZE)
2312 flush_dcache_page(pgv_to_page(start));
2317 if (po->tp_version <= TPACKET_V2) {
2318 __packet_set_status(po, h.raw, status);
2319 sk->sk_data_ready(sk);
2321 prb_clear_blk_fill_status(&po->rx_ring);
2325 if (skb_head != skb->data && skb_shared(skb)) {
2326 skb->data = skb_head;
2334 po->stats.stats1.tp_drops++;
2335 spin_unlock(&sk->sk_receive_queue.lock);
2337 sk->sk_data_ready(sk);
2338 kfree_skb(copy_skb);
2339 goto drop_n_restore;
2342 static void tpacket_destruct_skb(struct sk_buff *skb)
2344 struct packet_sock *po = pkt_sk(skb->sk);
2346 if (likely(po->tx_ring.pg_vec)) {
2350 ph = skb_shinfo(skb)->destructor_arg;
2351 packet_dec_pending(&po->tx_ring);
2353 ts = __packet_set_timestamp(po, ph, skb);
2354 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2360 static void tpacket_set_protocol(const struct net_device *dev,
2361 struct sk_buff *skb)
2363 if (dev->type == ARPHRD_ETHER) {
2364 skb_reset_mac_header(skb);
2365 skb->protocol = eth_hdr(skb)->h_proto;
2369 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2370 void *frame, struct net_device *dev, int size_max,
2371 __be16 proto, unsigned char *addr, int hlen)
2373 union tpacket_uhdr ph;
2374 int to_write, offset, len, tp_len, nr_frags, len_max;
2375 struct socket *sock = po->sk.sk_socket;
2382 skb->protocol = proto;
2384 skb->priority = po->sk.sk_priority;
2385 skb->mark = po->sk.sk_mark;
2386 sock_tx_timestamp(&po->sk, &skb_shinfo(skb)->tx_flags);
2387 skb_shinfo(skb)->destructor_arg = ph.raw;
2389 switch (po->tp_version) {
2391 tp_len = ph.h2->tp_len;
2394 tp_len = ph.h1->tp_len;
2397 if (unlikely(tp_len > size_max)) {
2398 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2402 skb_reserve(skb, hlen);
2403 skb_reset_network_header(skb);
2405 if (unlikely(po->tp_tx_has_off)) {
2406 int off_min, off_max, off;
2407 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2408 off_max = po->tx_ring.frame_size - tp_len;
2409 if (sock->type == SOCK_DGRAM) {
2410 switch (po->tp_version) {
2412 off = ph.h2->tp_net;
2415 off = ph.h1->tp_net;
2419 switch (po->tp_version) {
2421 off = ph.h2->tp_mac;
2424 off = ph.h1->tp_mac;
2428 if (unlikely((off < off_min) || (off_max < off)))
2430 data = ph.raw + off;
2432 data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
2436 if (sock->type == SOCK_DGRAM) {
2437 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2439 if (unlikely(err < 0))
2441 } else if (dev->hard_header_len) {
2442 int hdrlen = min_t(int, dev->hard_header_len, tp_len);
2444 skb_push(skb, dev->hard_header_len);
2445 err = skb_store_bits(skb, 0, data, hdrlen);
2448 if (!dev_validate_header(dev, skb->data, hdrlen))
2451 tpacket_set_protocol(dev, skb);
2457 offset = offset_in_page(data);
2458 len_max = PAGE_SIZE - offset;
2459 len = ((to_write > len_max) ? len_max : to_write);
2461 skb->data_len = to_write;
2462 skb->len += to_write;
2463 skb->truesize += to_write;
2464 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2466 while (likely(to_write)) {
2467 nr_frags = skb_shinfo(skb)->nr_frags;
2469 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2470 pr_err("Packet exceed the number of skb frags(%lu)\n",
2475 page = pgv_to_page(data);
2477 flush_dcache_page(page);
2479 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2482 len_max = PAGE_SIZE;
2483 len = ((to_write > len_max) ? len_max : to_write);
2486 skb_probe_transport_header(skb, 0);
2491 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2493 struct sk_buff *skb;
2494 struct net_device *dev;
2496 int err, reserve = 0;
2498 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2499 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2500 unsigned char *addr = NULL;
2501 int tp_len, size_max;
2503 int status = TP_STATUS_AVAILABLE;
2506 mutex_lock(&po->pg_vec_lock);
2508 /* packet_sendmsg() check on tx_ring.pg_vec was lockless,
2509 * we need to confirm it under protection of pg_vec_lock.
2511 if (unlikely(!po->tx_ring.pg_vec)) {
2515 if (likely(saddr == NULL)) {
2516 dev = packet_cached_dev_get(po);
2521 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2523 if (msg->msg_namelen < (saddr->sll_halen
2524 + offsetof(struct sockaddr_ll,
2527 proto = saddr->sll_protocol;
2528 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2529 if (po->sk.sk_socket->type == SOCK_DGRAM) {
2530 if (dev && msg->msg_namelen < dev->addr_len +
2531 offsetof(struct sockaddr_ll, sll_addr))
2533 addr = saddr->sll_addr;
2538 if (unlikely(dev == NULL))
2541 if (unlikely(!(dev->flags & IFF_UP)))
2544 if (po->sk.sk_socket->type == SOCK_RAW)
2545 reserve = dev->hard_header_len;
2546 size_max = po->tx_ring.frame_size
2547 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2549 if (size_max > dev->mtu + reserve + VLAN_HLEN)
2550 size_max = dev->mtu + reserve + VLAN_HLEN;
2553 ph = packet_current_frame(po, &po->tx_ring,
2554 TP_STATUS_SEND_REQUEST);
2555 if (unlikely(ph == NULL)) {
2556 if (need_wait && need_resched())
2561 status = TP_STATUS_SEND_REQUEST;
2562 hlen = LL_RESERVED_SPACE(dev);
2563 tlen = dev->needed_tailroom;
2564 skb = sock_alloc_send_skb(&po->sk,
2565 hlen + tlen + sizeof(struct sockaddr_ll),
2568 if (unlikely(skb == NULL)) {
2569 /* we assume the socket was initially writeable ... */
2570 if (likely(len_sum > 0))
2574 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
2576 if (likely(tp_len >= 0) &&
2577 tp_len > dev->mtu + reserve &&
2578 !packet_extra_vlan_len_allowed(dev, skb))
2581 if (unlikely(tp_len < 0)) {
2583 __packet_set_status(po, ph,
2584 TP_STATUS_AVAILABLE);
2585 packet_increment_head(&po->tx_ring);
2589 status = TP_STATUS_WRONG_FORMAT;
2595 packet_pick_tx_queue(dev, skb);
2597 skb->destructor = tpacket_destruct_skb;
2598 __packet_set_status(po, ph, TP_STATUS_SENDING);
2599 packet_inc_pending(&po->tx_ring);
2601 status = TP_STATUS_SEND_REQUEST;
2602 err = po->xmit(skb);
2603 if (unlikely(err > 0)) {
2604 err = net_xmit_errno(err);
2605 if (err && __packet_get_status(po, ph) ==
2606 TP_STATUS_AVAILABLE) {
2607 /* skb was destructed already */
2612 * skb was dropped but not destructed yet;
2613 * let's treat it like congestion or err < 0
2617 packet_increment_head(&po->tx_ring);
2619 } while (likely((ph != NULL) ||
2620 /* Note: packet_read_pending() might be slow if we have
2621 * to call it as it's per_cpu variable, but in fast-path
2622 * we already short-circuit the loop with the first
2623 * condition, and luckily don't have to go that path
2626 (need_wait && packet_read_pending(&po->tx_ring))));
2632 __packet_set_status(po, ph, status);
2637 mutex_unlock(&po->pg_vec_lock);
2641 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2642 size_t reserve, size_t len,
2643 size_t linear, int noblock,
2646 struct sk_buff *skb;
2648 /* Under a page? Don't bother with paged skb. */
2649 if (prepad + len < PAGE_SIZE || !linear)
2652 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2657 skb_reserve(skb, reserve);
2658 skb_put(skb, linear);
2659 skb->data_len = len - linear;
2660 skb->len += len - linear;
2665 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2667 struct sock *sk = sock->sk;
2668 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2669 struct sk_buff *skb;
2670 struct net_device *dev;
2672 unsigned char *addr = NULL;
2673 int err, reserve = 0;
2674 struct sockcm_cookie sockc;
2675 struct virtio_net_hdr vnet_hdr = { 0 };
2678 struct packet_sock *po = pkt_sk(sk);
2679 unsigned short gso_type = 0;
2680 bool has_vnet_hdr = false;
2681 int hlen, tlen, linear;
2686 * Get and verify the address.
2689 if (likely(saddr == NULL)) {
2690 dev = packet_cached_dev_get(po);
2694 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2696 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2698 proto = saddr->sll_protocol;
2699 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2700 if (sock->type == SOCK_DGRAM) {
2701 if (dev && msg->msg_namelen < dev->addr_len +
2702 offsetof(struct sockaddr_ll, sll_addr))
2704 addr = saddr->sll_addr;
2709 if (unlikely(dev == NULL))
2712 if (unlikely(!(dev->flags & IFF_UP)))
2715 sockc.mark = sk->sk_mark;
2716 if (msg->msg_controllen) {
2717 err = sock_cmsg_send(sk, msg, &sockc);
2722 if (sock->type == SOCK_RAW)
2723 reserve = dev->hard_header_len;
2724 if (po->has_vnet_hdr) {
2725 vnet_hdr_len = sizeof(vnet_hdr);
2728 if (len < vnet_hdr_len)
2731 len -= vnet_hdr_len;
2734 n = copy_from_iter(&vnet_hdr, vnet_hdr_len, &msg->msg_iter);
2735 if (n != vnet_hdr_len)
2738 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2739 (__virtio16_to_cpu(vio_le(), vnet_hdr.csum_start) +
2740 __virtio16_to_cpu(vio_le(), vnet_hdr.csum_offset) + 2 >
2741 __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len)))
2742 vnet_hdr.hdr_len = __cpu_to_virtio16(vio_le(),
2743 __virtio16_to_cpu(vio_le(), vnet_hdr.csum_start) +
2744 __virtio16_to_cpu(vio_le(), vnet_hdr.csum_offset) + 2);
2747 if (__virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len) > len)
2750 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2751 switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2752 case VIRTIO_NET_HDR_GSO_TCPV4:
2753 gso_type = SKB_GSO_TCPV4;
2755 case VIRTIO_NET_HDR_GSO_TCPV6:
2756 gso_type = SKB_GSO_TCPV6;
2758 case VIRTIO_NET_HDR_GSO_UDP:
2759 gso_type = SKB_GSO_UDP;
2765 if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
2766 gso_type |= SKB_GSO_TCP_ECN;
2768 if (vnet_hdr.gso_size == 0)
2772 has_vnet_hdr = true;
2775 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2776 if (!netif_supports_nofcs(dev)) {
2777 err = -EPROTONOSUPPORT;
2780 extra_len = 4; /* We're doing our own CRC */
2784 if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2788 hlen = LL_RESERVED_SPACE(dev);
2789 tlen = dev->needed_tailroom;
2790 linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len);
2791 linear = max(linear, min_t(int, len, dev->hard_header_len));
2792 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear,
2793 msg->msg_flags & MSG_DONTWAIT, &err);
2797 skb_reset_network_header(skb);
2800 if (sock->type == SOCK_DGRAM) {
2801 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2802 if (unlikely(offset < 0))
2804 } else if (reserve) {
2805 skb_reserve(skb, -reserve);
2807 skb_reset_network_header(skb);
2810 /* Returns -EFAULT on error */
2811 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2815 if (sock->type == SOCK_RAW &&
2816 !dev_validate_header(dev, skb->data, len)) {
2821 sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
2823 if (!gso_type && (len > dev->mtu + reserve + extra_len) &&
2824 !packet_extra_vlan_len_allowed(dev, skb)) {
2829 skb->protocol = proto;
2831 skb->priority = sk->sk_priority;
2832 skb->mark = sockc.mark;
2834 packet_pick_tx_queue(dev, skb);
2837 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2838 u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr.csum_start);
2839 u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr.csum_offset);
2840 if (!skb_partial_csum_set(skb, s, o)) {
2846 skb_shinfo(skb)->gso_size =
2847 __virtio16_to_cpu(vio_le(), vnet_hdr.gso_size);
2848 skb_shinfo(skb)->gso_type = gso_type;
2850 /* Header must be checked, and gso_segs computed. */
2851 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2852 skb_shinfo(skb)->gso_segs = 0;
2854 len += vnet_hdr_len;
2857 skb_probe_transport_header(skb, reserve);
2859 if (unlikely(extra_len == 4))
2862 err = po->xmit(skb);
2863 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2879 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2881 struct sock *sk = sock->sk;
2882 struct packet_sock *po = pkt_sk(sk);
2884 if (po->tx_ring.pg_vec)
2885 return tpacket_snd(po, msg);
2887 return packet_snd(sock, msg, len);
2891 * Close a PACKET socket. This is fairly simple. We immediately go
2892 * to 'closed' state and remove our protocol entry in the device list.
2895 static int packet_release(struct socket *sock)
2897 struct sock *sk = sock->sk;
2898 struct packet_sock *po;
2899 struct packet_fanout *f;
2901 union tpacket_req_u req_u;
2909 mutex_lock(&net->packet.sklist_lock);
2910 sk_del_node_init_rcu(sk);
2911 mutex_unlock(&net->packet.sklist_lock);
2914 sock_prot_inuse_add(net, sk->sk_prot, -1);
2917 spin_lock(&po->bind_lock);
2918 unregister_prot_hook(sk, false);
2919 packet_cached_dev_reset(po);
2921 if (po->prot_hook.dev) {
2922 dev_put(po->prot_hook.dev);
2923 po->prot_hook.dev = NULL;
2925 spin_unlock(&po->bind_lock);
2927 packet_flush_mclist(sk);
2930 if (po->rx_ring.pg_vec) {
2931 memset(&req_u, 0, sizeof(req_u));
2932 packet_set_ring(sk, &req_u, 1, 0);
2935 if (po->tx_ring.pg_vec) {
2936 memset(&req_u, 0, sizeof(req_u));
2937 packet_set_ring(sk, &req_u, 1, 1);
2941 f = fanout_release(sk);
2946 kfree(po->rollover);
2947 fanout_release_data(f);
2951 * Now the socket is dead. No more input will appear.
2958 skb_queue_purge(&sk->sk_receive_queue);
2959 packet_free_pending(po);
2960 sk_refcnt_debug_release(sk);
2967 * Attach a packet hook.
2970 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
2973 struct packet_sock *po = pkt_sk(sk);
2974 struct net_device *dev_curr;
2977 struct net_device *dev = NULL;
2979 bool unlisted = false;
2982 spin_lock(&po->bind_lock);
2991 dev = dev_get_by_name_rcu(sock_net(sk), name);
2996 } else if (ifindex) {
2997 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3007 proto_curr = po->prot_hook.type;
3008 dev_curr = po->prot_hook.dev;
3010 need_rehook = proto_curr != proto || dev_curr != dev;
3015 /* prevents packet_notifier() from calling
3016 * register_prot_hook()
3019 __unregister_prot_hook(sk, true);
3021 dev_curr = po->prot_hook.dev;
3023 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3027 BUG_ON(po->running);
3029 po->prot_hook.type = proto;
3031 if (unlikely(unlisted)) {
3033 po->prot_hook.dev = NULL;
3035 packet_cached_dev_reset(po);
3037 po->prot_hook.dev = dev;
3038 po->ifindex = dev ? dev->ifindex : 0;
3039 packet_cached_dev_assign(po, dev);
3045 if (proto == 0 || !need_rehook)
3048 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3049 register_prot_hook(sk);
3051 sk->sk_err = ENETDOWN;
3052 if (!sock_flag(sk, SOCK_DEAD))
3053 sk->sk_error_report(sk);
3058 spin_unlock(&po->bind_lock);
3064 * Bind a packet socket to a device
3067 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3070 struct sock *sk = sock->sk;
3071 char name[sizeof(uaddr->sa_data) + 1];
3077 if (addr_len != sizeof(struct sockaddr))
3079 /* uaddr->sa_data comes from the userspace, it's not guaranteed to be
3082 memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data));
3083 name[sizeof(uaddr->sa_data)] = 0;
3085 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3088 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3090 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3091 struct sock *sk = sock->sk;
3097 if (addr_len < sizeof(struct sockaddr_ll))
3099 if (sll->sll_family != AF_PACKET)
3102 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3103 sll->sll_protocol ? : pkt_sk(sk)->num);
3106 static struct proto packet_proto = {
3108 .owner = THIS_MODULE,
3109 .obj_size = sizeof(struct packet_sock),
3113 * Create a packet of type SOCK_PACKET.
3116 static int packet_create(struct net *net, struct socket *sock, int protocol,
3120 struct packet_sock *po;
3121 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3124 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3126 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3127 sock->type != SOCK_PACKET)
3128 return -ESOCKTNOSUPPORT;
3130 sock->state = SS_UNCONNECTED;
3133 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3137 sock->ops = &packet_ops;
3138 if (sock->type == SOCK_PACKET)
3139 sock->ops = &packet_ops_spkt;
3141 sock_init_data(sock, sk);
3144 sk->sk_family = PF_PACKET;
3146 po->xmit = dev_queue_xmit;
3148 err = packet_alloc_pending(po);
3152 packet_cached_dev_reset(po);
3154 sk->sk_destruct = packet_sock_destruct;
3155 sk_refcnt_debug_inc(sk);
3158 * Attach a protocol block
3161 spin_lock_init(&po->bind_lock);
3162 mutex_init(&po->pg_vec_lock);
3163 po->rollover = NULL;
3164 po->prot_hook.func = packet_rcv;
3166 if (sock->type == SOCK_PACKET)
3167 po->prot_hook.func = packet_rcv_spkt;
3169 po->prot_hook.af_packet_priv = sk;
3172 po->prot_hook.type = proto;
3173 __register_prot_hook(sk);
3176 mutex_lock(&net->packet.sklist_lock);
3177 sk_add_node_tail_rcu(sk, &net->packet.sklist);
3178 mutex_unlock(&net->packet.sklist_lock);
3181 sock_prot_inuse_add(net, &packet_proto, 1);
3192 * Pull a packet from our receive queue and hand it to the user.
3193 * If necessary we block.
3196 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3199 struct sock *sk = sock->sk;
3200 struct sk_buff *skb;
3202 int vnet_hdr_len = 0;
3203 unsigned int origlen = 0;
3206 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3210 /* What error should we return now? EUNATTACH? */
3211 if (pkt_sk(sk)->ifindex < 0)
3215 if (flags & MSG_ERRQUEUE) {
3216 err = sock_recv_errqueue(sk, msg, len,
3217 SOL_PACKET, PACKET_TX_TIMESTAMP);
3222 * Call the generic datagram receiver. This handles all sorts
3223 * of horrible races and re-entrancy so we can forget about it
3224 * in the protocol layers.
3226 * Now it will return ENETDOWN, if device have just gone down,
3227 * but then it will block.
3230 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3233 * An error occurred so return it. Because skb_recv_datagram()
3234 * handles the blocking we don't see and worry about blocking
3241 if (pkt_sk(sk)->pressure)
3242 packet_rcv_has_room(pkt_sk(sk), NULL);
3244 if (pkt_sk(sk)->has_vnet_hdr) {
3245 struct virtio_net_hdr vnet_hdr = { 0 };
3248 vnet_hdr_len = sizeof(vnet_hdr);
3249 if (len < vnet_hdr_len)
3252 len -= vnet_hdr_len;
3254 if (skb_is_gso(skb)) {
3255 struct skb_shared_info *sinfo = skb_shinfo(skb);
3257 /* This is a hint as to how much should be linear. */
3259 __cpu_to_virtio16(vio_le(), skb_headlen(skb));
3261 __cpu_to_virtio16(vio_le(), sinfo->gso_size);
3262 if (sinfo->gso_type & SKB_GSO_TCPV4)
3263 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
3264 else if (sinfo->gso_type & SKB_GSO_TCPV6)
3265 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
3266 else if (sinfo->gso_type & SKB_GSO_UDP)
3267 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
3268 else if (sinfo->gso_type & SKB_GSO_FCOE)
3272 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
3273 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
3275 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
3277 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3278 vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
3279 vnet_hdr.csum_start = __cpu_to_virtio16(vio_le(),
3280 skb_checksum_start_offset(skb));
3281 vnet_hdr.csum_offset = __cpu_to_virtio16(vio_le(),
3283 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
3284 vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
3285 } /* else everything is zero */
3287 err = memcpy_to_msg(msg, (void *)&vnet_hdr, vnet_hdr_len);
3292 /* You lose any data beyond the buffer you gave. If it worries
3293 * a user program they can ask the device for its MTU
3299 msg->msg_flags |= MSG_TRUNC;
3302 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3306 if (sock->type != SOCK_PACKET) {
3307 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3309 /* Original length was stored in sockaddr_ll fields */
3310 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3311 sll->sll_family = AF_PACKET;
3312 sll->sll_protocol = skb->protocol;
3315 sock_recv_ts_and_drops(msg, sk, skb);
3317 if (msg->msg_name) {
3320 /* If the address length field is there to be filled
3321 * in, we fill it in now.
3323 if (sock->type == SOCK_PACKET) {
3324 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3325 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3326 copy_len = msg->msg_namelen;
3328 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3330 msg->msg_namelen = sll->sll_halen +
3331 offsetof(struct sockaddr_ll, sll_addr);
3332 copy_len = msg->msg_namelen;
3333 if (msg->msg_namelen < sizeof(struct sockaddr_ll)) {
3334 memset(msg->msg_name +
3335 offsetof(struct sockaddr_ll, sll_addr),
3336 0, sizeof(sll->sll_addr));
3337 msg->msg_namelen = sizeof(struct sockaddr_ll);
3340 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, copy_len);
3343 if (pkt_sk(sk)->auxdata) {
3344 struct tpacket_auxdata aux;
3346 aux.tp_status = TP_STATUS_USER;
3347 if (skb->ip_summed == CHECKSUM_PARTIAL)
3348 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3349 else if (skb->pkt_type != PACKET_OUTGOING &&
3350 (skb->ip_summed == CHECKSUM_COMPLETE ||
3351 skb_csum_unnecessary(skb)))
3352 aux.tp_status |= TP_STATUS_CSUM_VALID;
3354 aux.tp_len = origlen;
3355 aux.tp_snaplen = skb->len;
3357 aux.tp_net = skb_network_offset(skb);
3358 if (skb_vlan_tag_present(skb)) {
3359 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3360 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3361 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3363 aux.tp_vlan_tci = 0;
3364 aux.tp_vlan_tpid = 0;
3366 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3370 * Free or return the buffer as appropriate. Again this
3371 * hides all the races and re-entrancy issues from us.
3373 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3376 skb_free_datagram(sk, skb);
3381 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3382 int *uaddr_len, int peer)
3384 struct net_device *dev;
3385 struct sock *sk = sock->sk;
3390 uaddr->sa_family = AF_PACKET;
3391 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3393 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3395 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3397 *uaddr_len = sizeof(*uaddr);
3402 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3403 int *uaddr_len, int peer)
3405 struct net_device *dev;
3406 struct sock *sk = sock->sk;
3407 struct packet_sock *po = pkt_sk(sk);
3408 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3413 sll->sll_family = AF_PACKET;
3414 sll->sll_ifindex = po->ifindex;
3415 sll->sll_protocol = po->num;
3416 sll->sll_pkttype = 0;
3418 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
3420 sll->sll_hatype = dev->type;
3421 sll->sll_halen = dev->addr_len;
3422 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3424 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3428 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3433 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3437 case PACKET_MR_MULTICAST:
3438 if (i->alen != dev->addr_len)
3441 return dev_mc_add(dev, i->addr);
3443 return dev_mc_del(dev, i->addr);
3445 case PACKET_MR_PROMISC:
3446 return dev_set_promiscuity(dev, what);
3447 case PACKET_MR_ALLMULTI:
3448 return dev_set_allmulti(dev, what);
3449 case PACKET_MR_UNICAST:
3450 if (i->alen != dev->addr_len)
3453 return dev_uc_add(dev, i->addr);
3455 return dev_uc_del(dev, i->addr);
3463 static void packet_dev_mclist_delete(struct net_device *dev,
3464 struct packet_mclist **mlp)
3466 struct packet_mclist *ml;
3468 while ((ml = *mlp) != NULL) {
3469 if (ml->ifindex == dev->ifindex) {
3470 packet_dev_mc(dev, ml, -1);
3478 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3480 struct packet_sock *po = pkt_sk(sk);
3481 struct packet_mclist *ml, *i;
3482 struct net_device *dev;
3488 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3493 if (mreq->mr_alen > dev->addr_len)
3497 i = kmalloc(sizeof(*i), GFP_KERNEL);
3502 for (ml = po->mclist; ml; ml = ml->next) {
3503 if (ml->ifindex == mreq->mr_ifindex &&
3504 ml->type == mreq->mr_type &&
3505 ml->alen == mreq->mr_alen &&
3506 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3508 /* Free the new element ... */
3514 i->type = mreq->mr_type;
3515 i->ifindex = mreq->mr_ifindex;
3516 i->alen = mreq->mr_alen;
3517 memcpy(i->addr, mreq->mr_address, i->alen);
3518 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
3520 i->next = po->mclist;
3522 err = packet_dev_mc(dev, i, 1);
3524 po->mclist = i->next;
3533 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3535 struct packet_mclist *ml, **mlp;
3539 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3540 if (ml->ifindex == mreq->mr_ifindex &&
3541 ml->type == mreq->mr_type &&
3542 ml->alen == mreq->mr_alen &&
3543 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3544 if (--ml->count == 0) {
3545 struct net_device *dev;
3547 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3549 packet_dev_mc(dev, ml, -1);
3559 static void packet_flush_mclist(struct sock *sk)
3561 struct packet_sock *po = pkt_sk(sk);
3562 struct packet_mclist *ml;
3568 while ((ml = po->mclist) != NULL) {
3569 struct net_device *dev;
3571 po->mclist = ml->next;
3572 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3574 packet_dev_mc(dev, ml, -1);
3581 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3583 struct sock *sk = sock->sk;
3584 struct packet_sock *po = pkt_sk(sk);
3587 if (level != SOL_PACKET)
3588 return -ENOPROTOOPT;
3591 case PACKET_ADD_MEMBERSHIP:
3592 case PACKET_DROP_MEMBERSHIP:
3594 struct packet_mreq_max mreq;
3596 memset(&mreq, 0, sizeof(mreq));
3597 if (len < sizeof(struct packet_mreq))
3599 if (len > sizeof(mreq))
3601 if (copy_from_user(&mreq, optval, len))
3603 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3605 if (optname == PACKET_ADD_MEMBERSHIP)
3606 ret = packet_mc_add(sk, &mreq);
3608 ret = packet_mc_drop(sk, &mreq);
3612 case PACKET_RX_RING:
3613 case PACKET_TX_RING:
3615 union tpacket_req_u req_u;
3619 switch (po->tp_version) {
3622 len = sizeof(req_u.req);
3626 len = sizeof(req_u.req3);
3632 if (pkt_sk(sk)->has_vnet_hdr) {
3635 if (copy_from_user(&req_u.req, optval, len))
3638 ret = packet_set_ring(sk, &req_u, 0,
3639 optname == PACKET_TX_RING);
3645 case PACKET_COPY_THRESH:
3649 if (optlen != sizeof(val))
3651 if (copy_from_user(&val, optval, sizeof(val)))
3654 pkt_sk(sk)->copy_thresh = val;
3657 case PACKET_VERSION:
3661 if (optlen != sizeof(val))
3663 if (copy_from_user(&val, optval, sizeof(val)))
3674 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3677 po->tp_version = val;
3683 case PACKET_RESERVE:
3687 if (optlen != sizeof(val))
3689 if (copy_from_user(&val, optval, sizeof(val)))
3694 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3697 po->tp_reserve = val;
3707 if (optlen != sizeof(val))
3709 if (copy_from_user(&val, optval, sizeof(val)))
3713 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3716 po->tp_loss = !!val;
3722 case PACKET_AUXDATA:
3726 if (optlen < sizeof(val))
3728 if (copy_from_user(&val, optval, sizeof(val)))
3732 po->auxdata = !!val;
3736 case PACKET_ORIGDEV:
3740 if (optlen < sizeof(val))
3742 if (copy_from_user(&val, optval, sizeof(val)))
3746 po->origdev = !!val;
3750 case PACKET_VNET_HDR:
3754 if (sock->type != SOCK_RAW)
3756 if (optlen < sizeof(val))
3758 if (copy_from_user(&val, optval, sizeof(val)))
3762 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3765 po->has_vnet_hdr = !!val;
3771 case PACKET_TIMESTAMP:
3775 if (optlen != sizeof(val))
3777 if (copy_from_user(&val, optval, sizeof(val)))
3780 po->tp_tstamp = val;
3787 if (optlen != sizeof(val))
3789 if (copy_from_user(&val, optval, sizeof(val)))
3792 return fanout_add(sk, val & 0xffff, val >> 16);
3794 case PACKET_FANOUT_DATA:
3799 return fanout_set_data(po, optval, optlen);
3801 case PACKET_TX_HAS_OFF:
3805 if (optlen != sizeof(val))
3807 if (copy_from_user(&val, optval, sizeof(val)))
3811 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3814 po->tp_tx_has_off = !!val;
3820 case PACKET_QDISC_BYPASS:
3824 if (optlen != sizeof(val))
3826 if (copy_from_user(&val, optval, sizeof(val)))
3829 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3833 return -ENOPROTOOPT;
3837 static int packet_getsockopt(struct socket *sock, int level, int optname,
3838 char __user *optval, int __user *optlen)
3841 int val, lv = sizeof(val);
3842 struct sock *sk = sock->sk;
3843 struct packet_sock *po = pkt_sk(sk);
3845 union tpacket_stats_u st;
3846 struct tpacket_rollover_stats rstats;
3848 if (level != SOL_PACKET)
3849 return -ENOPROTOOPT;
3851 if (get_user(len, optlen))
3858 case PACKET_STATISTICS:
3859 spin_lock_bh(&sk->sk_receive_queue.lock);
3860 memcpy(&st, &po->stats, sizeof(st));
3861 memset(&po->stats, 0, sizeof(po->stats));
3862 spin_unlock_bh(&sk->sk_receive_queue.lock);
3864 if (po->tp_version == TPACKET_V3) {
3865 lv = sizeof(struct tpacket_stats_v3);
3866 st.stats3.tp_packets += st.stats3.tp_drops;
3869 lv = sizeof(struct tpacket_stats);
3870 st.stats1.tp_packets += st.stats1.tp_drops;
3875 case PACKET_AUXDATA:
3878 case PACKET_ORIGDEV:
3881 case PACKET_VNET_HDR:
3882 val = po->has_vnet_hdr;
3884 case PACKET_VERSION:
3885 val = po->tp_version;
3888 if (len > sizeof(int))
3890 if (len < sizeof(int))
3892 if (copy_from_user(&val, optval, len))
3896 val = sizeof(struct tpacket_hdr);
3899 val = sizeof(struct tpacket2_hdr);
3902 val = sizeof(struct tpacket3_hdr);
3908 case PACKET_RESERVE:
3909 val = po->tp_reserve;
3914 case PACKET_TIMESTAMP:
3915 val = po->tp_tstamp;
3919 ((u32)po->fanout->id |
3920 ((u32)po->fanout->type << 16) |
3921 ((u32)po->fanout->flags << 24)) :
3924 case PACKET_ROLLOVER_STATS:
3927 rstats.tp_all = atomic_long_read(&po->rollover->num);
3928 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3929 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3931 lv = sizeof(rstats);
3933 case PACKET_TX_HAS_OFF:
3934 val = po->tp_tx_has_off;
3936 case PACKET_QDISC_BYPASS:
3937 val = packet_use_direct_xmit(po);
3940 return -ENOPROTOOPT;
3945 if (put_user(len, optlen))
3947 if (copy_to_user(optval, data, len))
3953 static int packet_notifier(struct notifier_block *this,
3954 unsigned long msg, void *ptr)
3957 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3958 struct net *net = dev_net(dev);
3961 sk_for_each_rcu(sk, &net->packet.sklist) {
3962 struct packet_sock *po = pkt_sk(sk);
3965 case NETDEV_UNREGISTER:
3967 packet_dev_mclist_delete(dev, &po->mclist);
3971 if (dev->ifindex == po->ifindex) {
3972 spin_lock(&po->bind_lock);
3974 __unregister_prot_hook(sk, false);
3975 sk->sk_err = ENETDOWN;
3976 if (!sock_flag(sk, SOCK_DEAD))
3977 sk->sk_error_report(sk);
3979 if (msg == NETDEV_UNREGISTER) {
3980 packet_cached_dev_reset(po);
3982 if (po->prot_hook.dev)
3983 dev_put(po->prot_hook.dev);
3984 po->prot_hook.dev = NULL;
3986 spin_unlock(&po->bind_lock);
3990 if (dev->ifindex == po->ifindex) {
3991 spin_lock(&po->bind_lock);
3993 register_prot_hook(sk);
3994 spin_unlock(&po->bind_lock);
4004 static int packet_ioctl(struct socket *sock, unsigned int cmd,
4007 struct sock *sk = sock->sk;
4012 int amount = sk_wmem_alloc_get(sk);
4014 return put_user(amount, (int __user *)arg);
4018 struct sk_buff *skb;
4021 spin_lock_bh(&sk->sk_receive_queue.lock);
4022 skb = skb_peek(&sk->sk_receive_queue);
4025 spin_unlock_bh(&sk->sk_receive_queue.lock);
4026 return put_user(amount, (int __user *)arg);
4029 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4031 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4041 case SIOCGIFBRDADDR:
4042 case SIOCSIFBRDADDR:
4043 case SIOCGIFNETMASK:
4044 case SIOCSIFNETMASK:
4045 case SIOCGIFDSTADDR:
4046 case SIOCSIFDSTADDR:
4048 return inet_dgram_ops.ioctl(sock, cmd, arg);
4052 return -ENOIOCTLCMD;
4057 static unsigned int packet_poll(struct file *file, struct socket *sock,
4060 struct sock *sk = sock->sk;
4061 struct packet_sock *po = pkt_sk(sk);
4062 unsigned int mask = datagram_poll(file, sock, wait);
4064 spin_lock_bh(&sk->sk_receive_queue.lock);
4065 if (po->rx_ring.pg_vec) {
4066 if (!packet_previous_rx_frame(po, &po->rx_ring,
4068 mask |= POLLIN | POLLRDNORM;
4070 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4072 spin_unlock_bh(&sk->sk_receive_queue.lock);
4073 spin_lock_bh(&sk->sk_write_queue.lock);
4074 if (po->tx_ring.pg_vec) {
4075 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4076 mask |= POLLOUT | POLLWRNORM;
4078 spin_unlock_bh(&sk->sk_write_queue.lock);
4083 /* Dirty? Well, I still did not learn better way to account
4087 static void packet_mm_open(struct vm_area_struct *vma)
4089 struct file *file = vma->vm_file;
4090 struct socket *sock = file->private_data;
4091 struct sock *sk = sock->sk;
4094 atomic_inc(&pkt_sk(sk)->mapped);
4097 static void packet_mm_close(struct vm_area_struct *vma)
4099 struct file *file = vma->vm_file;
4100 struct socket *sock = file->private_data;
4101 struct sock *sk = sock->sk;
4104 atomic_dec(&pkt_sk(sk)->mapped);
4107 static const struct vm_operations_struct packet_mmap_ops = {
4108 .open = packet_mm_open,
4109 .close = packet_mm_close,
4112 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4117 for (i = 0; i < len; i++) {
4118 if (likely(pg_vec[i].buffer)) {
4119 if (is_vmalloc_addr(pg_vec[i].buffer))
4120 vfree(pg_vec[i].buffer);
4122 free_pages((unsigned long)pg_vec[i].buffer,
4124 pg_vec[i].buffer = NULL;
4130 static char *alloc_one_pg_vec_page(unsigned long order)
4133 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4134 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4136 buffer = (char *) __get_free_pages(gfp_flags, order);
4140 /* __get_free_pages failed, fall back to vmalloc */
4141 buffer = vzalloc((1 << order) * PAGE_SIZE);
4145 /* vmalloc failed, lets dig into swap here */
4146 gfp_flags &= ~__GFP_NORETRY;
4147 buffer = (char *) __get_free_pages(gfp_flags, order);
4151 /* complete and utter failure */
4155 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4157 unsigned int block_nr = req->tp_block_nr;
4161 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL | __GFP_NOWARN);
4162 if (unlikely(!pg_vec))
4165 for (i = 0; i < block_nr; i++) {
4166 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4167 if (unlikely(!pg_vec[i].buffer))
4168 goto out_free_pgvec;
4175 free_pg_vec(pg_vec, order, block_nr);
4180 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4181 int closing, int tx_ring)
4183 struct pgv *pg_vec = NULL;
4184 struct packet_sock *po = pkt_sk(sk);
4185 int was_running, order = 0;
4186 struct packet_ring_buffer *rb;
4187 struct sk_buff_head *rb_queue;
4190 /* Added to avoid minimal code churn */
4191 struct tpacket_req *req = &req_u->req;
4193 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
4194 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
4195 net_warn_ratelimited("Tx-ring is not supported.\n");
4199 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4200 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4204 if (atomic_read(&po->mapped))
4206 if (packet_read_pending(rb))
4210 if (req->tp_block_nr) {
4211 unsigned int min_frame_size;
4213 /* Sanity tests and some calculations */
4215 if (unlikely(rb->pg_vec))
4218 switch (po->tp_version) {
4220 po->tp_hdrlen = TPACKET_HDRLEN;
4223 po->tp_hdrlen = TPACKET2_HDRLEN;
4226 po->tp_hdrlen = TPACKET3_HDRLEN;
4231 if (unlikely((int)req->tp_block_size <= 0))
4233 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4235 min_frame_size = po->tp_hdrlen + po->tp_reserve;
4236 if (po->tp_version >= TPACKET_V3 &&
4237 req->tp_block_size <
4238 BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv) + min_frame_size)
4240 if (unlikely(req->tp_frame_size < min_frame_size))
4242 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4245 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4246 if (unlikely(rb->frames_per_block == 0))
4248 if (unlikely(rb->frames_per_block > UINT_MAX / req->tp_block_nr))
4250 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4255 order = get_order(req->tp_block_size);
4256 pg_vec = alloc_pg_vec(req, order);
4257 if (unlikely(!pg_vec))
4259 switch (po->tp_version) {
4261 /* Transmit path is not supported. We checked
4262 * it above but just being paranoid
4265 init_prb_bdqc(po, rb, pg_vec, req_u);
4274 if (unlikely(req->tp_frame_nr))
4279 /* Detach socket from network */
4280 spin_lock(&po->bind_lock);
4281 was_running = po->running;
4285 __unregister_prot_hook(sk, false);
4287 spin_unlock(&po->bind_lock);
4292 mutex_lock(&po->pg_vec_lock);
4293 if (closing || atomic_read(&po->mapped) == 0) {
4295 spin_lock_bh(&rb_queue->lock);
4296 swap(rb->pg_vec, pg_vec);
4297 rb->frame_max = (req->tp_frame_nr - 1);
4299 rb->frame_size = req->tp_frame_size;
4300 spin_unlock_bh(&rb_queue->lock);
4302 swap(rb->pg_vec_order, order);
4303 swap(rb->pg_vec_len, req->tp_block_nr);
4305 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4306 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4307 tpacket_rcv : packet_rcv;
4308 skb_queue_purge(rb_queue);
4309 if (atomic_read(&po->mapped))
4310 pr_err("packet_mmap: vma is busy: %d\n",
4311 atomic_read(&po->mapped));
4313 mutex_unlock(&po->pg_vec_lock);
4315 spin_lock(&po->bind_lock);
4318 register_prot_hook(sk);
4320 spin_unlock(&po->bind_lock);
4321 if (pg_vec && (po->tp_version > TPACKET_V2)) {
4322 /* Because we don't support block-based V3 on tx-ring */
4324 prb_shutdown_retire_blk_timer(po, rb_queue);
4328 free_pg_vec(pg_vec, order, req->tp_block_nr);
4333 static int packet_mmap(struct file *file, struct socket *sock,
4334 struct vm_area_struct *vma)
4336 struct sock *sk = sock->sk;
4337 struct packet_sock *po = pkt_sk(sk);
4338 unsigned long size, expected_size;
4339 struct packet_ring_buffer *rb;
4340 unsigned long start;
4347 mutex_lock(&po->pg_vec_lock);
4350 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4352 expected_size += rb->pg_vec_len
4358 if (expected_size == 0)
4361 size = vma->vm_end - vma->vm_start;
4362 if (size != expected_size)
4365 start = vma->vm_start;
4366 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4367 if (rb->pg_vec == NULL)
4370 for (i = 0; i < rb->pg_vec_len; i++) {
4372 void *kaddr = rb->pg_vec[i].buffer;
4375 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4376 page = pgv_to_page(kaddr);
4377 err = vm_insert_page(vma, start, page);
4386 atomic_inc(&po->mapped);
4387 vma->vm_ops = &packet_mmap_ops;
4391 mutex_unlock(&po->pg_vec_lock);
4395 static const struct proto_ops packet_ops_spkt = {
4396 .family = PF_PACKET,
4397 .owner = THIS_MODULE,
4398 .release = packet_release,
4399 .bind = packet_bind_spkt,
4400 .connect = sock_no_connect,
4401 .socketpair = sock_no_socketpair,
4402 .accept = sock_no_accept,
4403 .getname = packet_getname_spkt,
4404 .poll = datagram_poll,
4405 .ioctl = packet_ioctl,
4406 .listen = sock_no_listen,
4407 .shutdown = sock_no_shutdown,
4408 .setsockopt = sock_no_setsockopt,
4409 .getsockopt = sock_no_getsockopt,
4410 .sendmsg = packet_sendmsg_spkt,
4411 .recvmsg = packet_recvmsg,
4412 .mmap = sock_no_mmap,
4413 .sendpage = sock_no_sendpage,
4416 static const struct proto_ops packet_ops = {
4417 .family = PF_PACKET,
4418 .owner = THIS_MODULE,
4419 .release = packet_release,
4420 .bind = packet_bind,
4421 .connect = sock_no_connect,
4422 .socketpair = sock_no_socketpair,
4423 .accept = sock_no_accept,
4424 .getname = packet_getname,
4425 .poll = packet_poll,
4426 .ioctl = packet_ioctl,
4427 .listen = sock_no_listen,
4428 .shutdown = sock_no_shutdown,
4429 .setsockopt = packet_setsockopt,
4430 .getsockopt = packet_getsockopt,
4431 .sendmsg = packet_sendmsg,
4432 .recvmsg = packet_recvmsg,
4433 .mmap = packet_mmap,
4434 .sendpage = sock_no_sendpage,
4437 static const struct net_proto_family packet_family_ops = {
4438 .family = PF_PACKET,
4439 .create = packet_create,
4440 .owner = THIS_MODULE,
4443 static struct notifier_block packet_netdev_notifier = {
4444 .notifier_call = packet_notifier,
4447 #ifdef CONFIG_PROC_FS
4449 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4452 struct net *net = seq_file_net(seq);
4455 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4458 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4460 struct net *net = seq_file_net(seq);
4461 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4464 static void packet_seq_stop(struct seq_file *seq, void *v)
4470 static int packet_seq_show(struct seq_file *seq, void *v)
4472 if (v == SEQ_START_TOKEN)
4473 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4475 struct sock *s = sk_entry(v);
4476 const struct packet_sock *po = pkt_sk(s);
4479 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4481 atomic_read(&s->sk_refcnt),
4486 atomic_read(&s->sk_rmem_alloc),
4487 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4494 static const struct seq_operations packet_seq_ops = {
4495 .start = packet_seq_start,
4496 .next = packet_seq_next,
4497 .stop = packet_seq_stop,
4498 .show = packet_seq_show,
4501 static int packet_seq_open(struct inode *inode, struct file *file)
4503 return seq_open_net(inode, file, &packet_seq_ops,
4504 sizeof(struct seq_net_private));
4507 static const struct file_operations packet_seq_fops = {
4508 .owner = THIS_MODULE,
4509 .open = packet_seq_open,
4511 .llseek = seq_lseek,
4512 .release = seq_release_net,
4517 static int __net_init packet_net_init(struct net *net)
4519 mutex_init(&net->packet.sklist_lock);
4520 INIT_HLIST_HEAD(&net->packet.sklist);
4522 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4528 static void __net_exit packet_net_exit(struct net *net)
4530 remove_proc_entry("packet", net->proc_net);
4533 static struct pernet_operations packet_net_ops = {
4534 .init = packet_net_init,
4535 .exit = packet_net_exit,
4539 static void __exit packet_exit(void)
4541 unregister_netdevice_notifier(&packet_netdev_notifier);
4542 unregister_pernet_subsys(&packet_net_ops);
4543 sock_unregister(PF_PACKET);
4544 proto_unregister(&packet_proto);
4547 static int __init packet_init(void)
4551 rc = proto_register(&packet_proto, 0);
4554 rc = sock_register(&packet_family_ops);
4557 rc = register_pernet_subsys(&packet_net_ops);
4560 rc = register_netdevice_notifier(&packet_netdev_notifier);
4567 unregister_pernet_subsys(&packet_net_ops);
4569 sock_unregister(PF_PACKET);
4571 proto_unregister(&packet_proto);
4576 module_init(packet_init);
4577 module_exit(packet_exit);
4578 MODULE_LICENSE("GPL");
4579 MODULE_ALIAS_NETPROTO(PF_PACKET);