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 <linux/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>
96 #include <net/compat.h>
102 - if device has no dev->hard_header routine, it adds and removes ll header
103 inside itself. In this case ll header is invisible outside of device,
104 but higher levels still should reserve dev->hard_header_len.
105 Some devices are enough clever to reallocate skb, when header
106 will not fit to reserved space (tunnel), another ones are silly
108 - packet socket receives packets with pulled ll header,
109 so that SOCK_RAW should push it back.
114 Incoming, dev->hard_header!=NULL
115 mac_header -> ll header
118 Outgoing, dev->hard_header!=NULL
119 mac_header -> ll header
122 Incoming, dev->hard_header==NULL
123 mac_header -> UNKNOWN position. It is very likely, that it points to ll
124 header. PPP makes it, that is wrong, because introduce
125 assymetry between rx and tx paths.
128 Outgoing, dev->hard_header==NULL
129 mac_header -> data. ll header is still not built!
133 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
139 dev->hard_header != NULL
140 mac_header -> ll header
143 dev->hard_header == NULL (ll header is added by device, we cannot control it)
147 We should set nh.raw on output to correct posistion,
148 packet classifier depends on it.
151 /* Private packet socket structures. */
153 /* identical to struct packet_mreq except it has
154 * a longer address field.
156 struct packet_mreq_max {
158 unsigned short mr_type;
159 unsigned short mr_alen;
160 unsigned char mr_address[MAX_ADDR_LEN];
164 struct tpacket_hdr *h1;
165 struct tpacket2_hdr *h2;
166 struct tpacket3_hdr *h3;
170 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
171 int closing, int tx_ring);
173 #define V3_ALIGNMENT (8)
175 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
177 #define BLK_PLUS_PRIV(sz_of_priv) \
178 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
180 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
181 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
182 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
183 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
184 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
185 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
186 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
189 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
190 struct packet_type *pt, struct net_device *orig_dev);
192 static void *packet_previous_frame(struct packet_sock *po,
193 struct packet_ring_buffer *rb,
195 static void packet_increment_head(struct packet_ring_buffer *buff);
196 static int prb_curr_blk_in_use(struct tpacket_block_desc *);
197 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
198 struct packet_sock *);
199 static void prb_retire_current_block(struct tpacket_kbdq_core *,
200 struct packet_sock *, unsigned int status);
201 static int prb_queue_frozen(struct tpacket_kbdq_core *);
202 static void prb_open_block(struct tpacket_kbdq_core *,
203 struct tpacket_block_desc *);
204 static void prb_retire_rx_blk_timer_expired(unsigned long);
205 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
206 static void prb_init_blk_timer(struct packet_sock *,
207 struct tpacket_kbdq_core *,
208 void (*func) (unsigned long));
209 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
210 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
211 struct tpacket3_hdr *);
212 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
213 struct tpacket3_hdr *);
214 static void packet_flush_mclist(struct sock *sk);
215 static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb);
217 struct packet_skb_cb {
219 struct sockaddr_pkt pkt;
221 /* Trick: alias skb original length with
222 * ll.sll_family and ll.protocol in order
225 unsigned int origlen;
226 struct sockaddr_ll ll;
231 #define vio_le() virtio_legacy_is_little_endian()
233 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
235 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
236 #define GET_PBLOCK_DESC(x, bid) \
237 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
238 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
239 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
240 #define GET_NEXT_PRB_BLK_NUM(x) \
241 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
242 ((x)->kactive_blk_num+1) : 0)
244 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
245 static void __fanout_link(struct sock *sk, struct packet_sock *po);
247 static int packet_direct_xmit(struct sk_buff *skb)
249 struct net_device *dev = skb->dev;
250 struct sk_buff *orig_skb = skb;
251 struct netdev_queue *txq;
252 int ret = NETDEV_TX_BUSY;
254 if (unlikely(!netif_running(dev) ||
255 !netif_carrier_ok(dev)))
258 skb = validate_xmit_skb_list(skb, dev);
262 packet_pick_tx_queue(dev, skb);
263 txq = skb_get_tx_queue(dev, skb);
267 HARD_TX_LOCK(dev, txq, smp_processor_id());
268 if (!netif_xmit_frozen_or_drv_stopped(txq))
269 ret = netdev_start_xmit(skb, dev, txq, false);
270 HARD_TX_UNLOCK(dev, txq);
274 if (!dev_xmit_complete(ret))
279 atomic_long_inc(&dev->tx_dropped);
281 return NET_XMIT_DROP;
284 static struct net_device *packet_cached_dev_get(struct packet_sock *po)
286 struct net_device *dev;
289 dev = rcu_dereference(po->cached_dev);
297 static void packet_cached_dev_assign(struct packet_sock *po,
298 struct net_device *dev)
300 rcu_assign_pointer(po->cached_dev, dev);
303 static void packet_cached_dev_reset(struct packet_sock *po)
305 RCU_INIT_POINTER(po->cached_dev, NULL);
308 static bool packet_use_direct_xmit(const struct packet_sock *po)
310 return po->xmit == packet_direct_xmit;
313 static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
315 return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
318 static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
320 const struct net_device_ops *ops = dev->netdev_ops;
323 if (ops->ndo_select_queue) {
324 queue_index = ops->ndo_select_queue(dev, skb, NULL,
325 __packet_pick_tx_queue);
326 queue_index = netdev_cap_txqueue(dev, queue_index);
328 queue_index = __packet_pick_tx_queue(dev, skb);
331 skb_set_queue_mapping(skb, queue_index);
334 /* register_prot_hook must be invoked with the po->bind_lock held,
335 * or from a context in which asynchronous accesses to the packet
336 * socket is not possible (packet_create()).
338 static void register_prot_hook(struct sock *sk)
340 struct packet_sock *po = pkt_sk(sk);
344 __fanout_link(sk, po);
346 dev_add_pack(&po->prot_hook);
353 /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
354 * held. If the sync parameter is true, we will temporarily drop
355 * the po->bind_lock and do a synchronize_net to make sure no
356 * asynchronous packet processing paths still refer to the elements
357 * of po->prot_hook. If the sync parameter is false, it is the
358 * callers responsibility to take care of this.
360 static void __unregister_prot_hook(struct sock *sk, bool sync)
362 struct packet_sock *po = pkt_sk(sk);
367 __fanout_unlink(sk, po);
369 __dev_remove_pack(&po->prot_hook);
374 spin_unlock(&po->bind_lock);
376 spin_lock(&po->bind_lock);
380 static void unregister_prot_hook(struct sock *sk, bool sync)
382 struct packet_sock *po = pkt_sk(sk);
385 __unregister_prot_hook(sk, sync);
388 static inline struct page * __pure pgv_to_page(void *addr)
390 if (is_vmalloc_addr(addr))
391 return vmalloc_to_page(addr);
392 return virt_to_page(addr);
395 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
397 union tpacket_uhdr h;
400 switch (po->tp_version) {
402 h.h1->tp_status = status;
403 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
406 h.h2->tp_status = status;
407 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
410 h.h3->tp_status = status;
411 flush_dcache_page(pgv_to_page(&h.h3->tp_status));
414 WARN(1, "TPACKET version not supported.\n");
421 static int __packet_get_status(struct packet_sock *po, void *frame)
423 union tpacket_uhdr h;
428 switch (po->tp_version) {
430 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
431 return h.h1->tp_status;
433 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
434 return h.h2->tp_status;
436 flush_dcache_page(pgv_to_page(&h.h3->tp_status));
437 return h.h3->tp_status;
439 WARN(1, "TPACKET version not supported.\n");
445 static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
448 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
451 (flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
452 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
453 return TP_STATUS_TS_RAW_HARDWARE;
455 if (ktime_to_timespec_cond(skb->tstamp, ts))
456 return TP_STATUS_TS_SOFTWARE;
461 static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
464 union tpacket_uhdr h;
468 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
472 switch (po->tp_version) {
474 h.h1->tp_sec = ts.tv_sec;
475 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
478 h.h2->tp_sec = ts.tv_sec;
479 h.h2->tp_nsec = ts.tv_nsec;
482 h.h3->tp_sec = ts.tv_sec;
483 h.h3->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_link_ksettings ecmd;
570 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
571 if (unlikely(!dev)) {
573 return DEFAULT_PRB_RETIRE_TOV;
575 err = __ethtool_get_link_ksettings(dev, &ecmd);
579 * If the link speed is so slow you don't really
580 * need to worry about perf anyways
582 if (ecmd.base.speed < SPEED_1000 ||
583 ecmd.base.speed == SPEED_UNKNOWN) {
584 return DEFAULT_PRB_RETIRE_TOV;
587 div = ecmd.base.speed / 1000;
591 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
603 static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
604 union tpacket_req_u *req_u)
606 p1->feature_req_word = req_u->req3.tp_feature_req_word;
609 static void init_prb_bdqc(struct packet_sock *po,
610 struct packet_ring_buffer *rb,
612 union tpacket_req_u *req_u)
614 struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
615 struct tpacket_block_desc *pbd;
617 memset(p1, 0x0, sizeof(*p1));
619 p1->knxt_seq_num = 1;
621 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
622 p1->pkblk_start = pg_vec[0].buffer;
623 p1->kblk_size = req_u->req3.tp_block_size;
624 p1->knum_blocks = req_u->req3.tp_block_nr;
625 p1->hdrlen = po->tp_hdrlen;
626 p1->version = po->tp_version;
627 p1->last_kactive_blk_num = 0;
628 po->stats.stats3.tp_freeze_q_cnt = 0;
629 if (req_u->req3.tp_retire_blk_tov)
630 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
632 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
633 req_u->req3.tp_block_size);
634 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
635 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
637 p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
638 prb_init_ft_ops(p1, req_u);
639 prb_setup_retire_blk_timer(po);
640 prb_open_block(p1, pbd);
643 /* Do NOT update the last_blk_num first.
644 * Assumes sk_buff_head lock is held.
646 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
648 mod_timer(&pkc->retire_blk_timer,
649 jiffies + pkc->tov_in_jiffies);
650 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
655 * 1) We refresh the timer only when we open a block.
656 * By doing this we don't waste cycles refreshing the timer
657 * on packet-by-packet basis.
659 * With a 1MB block-size, on a 1Gbps line, it will take
660 * i) ~8 ms to fill a block + ii) memcpy etc.
661 * In this cut we are not accounting for the memcpy time.
663 * So, if the user sets the 'tmo' to 10ms then the timer
664 * will never fire while the block is still getting filled
665 * (which is what we want). However, the user could choose
666 * to close a block early and that's fine.
668 * But when the timer does fire, we check whether or not to refresh it.
669 * Since the tmo granularity is in msecs, it is not too expensive
670 * to refresh the timer, lets say every '8' msecs.
671 * Either the user can set the 'tmo' or we can derive it based on
672 * a) line-speed and b) block-size.
673 * prb_calc_retire_blk_tmo() calculates the tmo.
676 static void prb_retire_rx_blk_timer_expired(unsigned long data)
678 struct packet_sock *po = (struct packet_sock *)data;
679 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
681 struct tpacket_block_desc *pbd;
683 spin_lock(&po->sk.sk_receive_queue.lock);
685 frozen = prb_queue_frozen(pkc);
686 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
688 if (unlikely(pkc->delete_blk_timer))
691 /* We only need to plug the race when the block is partially filled.
693 * lock(); increment BLOCK_NUM_PKTS; unlock()
694 * copy_bits() is in progress ...
695 * timer fires on other cpu:
696 * we can't retire the current block because copy_bits
700 if (BLOCK_NUM_PKTS(pbd)) {
701 while (atomic_read(&pkc->blk_fill_in_prog)) {
702 /* Waiting for skb_copy_bits to finish... */
707 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
709 if (!BLOCK_NUM_PKTS(pbd)) {
710 /* An empty block. Just refresh the timer. */
713 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
714 if (!prb_dispatch_next_block(pkc, po))
719 /* Case 1. Queue was frozen because user-space was
722 if (prb_curr_blk_in_use(pbd)) {
724 * Ok, user-space is still behind.
725 * So just refresh the timer.
729 /* Case 2. queue was frozen,user-space caught up,
730 * now the link went idle && the timer fired.
731 * We don't have a block to close.So we open this
732 * block and restart the timer.
733 * opening a block thaws the queue,restarts timer
734 * Thawing/timer-refresh is a side effect.
736 prb_open_block(pkc, pbd);
743 _prb_refresh_rx_retire_blk_timer(pkc);
746 spin_unlock(&po->sk.sk_receive_queue.lock);
749 static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
750 struct tpacket_block_desc *pbd1, __u32 status)
752 /* Flush everything minus the block header */
754 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
759 /* Skip the block header(we know header WILL fit in 4K) */
762 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
763 for (; start < end; start += PAGE_SIZE)
764 flush_dcache_page(pgv_to_page(start));
769 /* Now update the block status. */
771 BLOCK_STATUS(pbd1) = status;
773 /* Flush the block header */
775 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
777 flush_dcache_page(pgv_to_page(start));
787 * 2) Increment active_blk_num
789 * Note:We DONT refresh the timer on purpose.
790 * Because almost always the next block will be opened.
792 static void prb_close_block(struct tpacket_kbdq_core *pkc1,
793 struct tpacket_block_desc *pbd1,
794 struct packet_sock *po, unsigned int stat)
796 __u32 status = TP_STATUS_USER | stat;
798 struct tpacket3_hdr *last_pkt;
799 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
800 struct sock *sk = &po->sk;
802 if (po->stats.stats3.tp_drops)
803 status |= TP_STATUS_LOSING;
805 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
806 last_pkt->tp_next_offset = 0;
808 /* Get the ts of the last pkt */
809 if (BLOCK_NUM_PKTS(pbd1)) {
810 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
811 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
813 /* Ok, we tmo'd - so get the current time.
815 * It shouldn't really happen as we don't close empty
816 * blocks. See prb_retire_rx_blk_timer_expired().
820 h1->ts_last_pkt.ts_sec = ts.tv_sec;
821 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
826 /* Flush the block */
827 prb_flush_block(pkc1, pbd1, status);
829 sk->sk_data_ready(sk);
831 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
834 static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
836 pkc->reset_pending_on_curr_blk = 0;
840 * Side effect of opening a block:
842 * 1) prb_queue is thawed.
843 * 2) retire_blk_timer is refreshed.
846 static void prb_open_block(struct tpacket_kbdq_core *pkc1,
847 struct tpacket_block_desc *pbd1)
850 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
854 /* We could have just memset this but we will lose the
855 * flexibility of making the priv area sticky
858 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
859 BLOCK_NUM_PKTS(pbd1) = 0;
860 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
864 h1->ts_first_pkt.ts_sec = ts.tv_sec;
865 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
867 pkc1->pkblk_start = (char *)pbd1;
868 pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
870 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
871 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
873 pbd1->version = pkc1->version;
874 pkc1->prev = pkc1->nxt_offset;
875 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
877 prb_thaw_queue(pkc1);
878 _prb_refresh_rx_retire_blk_timer(pkc1);
884 * Queue freeze logic:
885 * 1) Assume tp_block_nr = 8 blocks.
886 * 2) At time 't0', user opens Rx ring.
887 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
888 * 4) user-space is either sleeping or processing block '0'.
889 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
890 * it will close block-7,loop around and try to fill block '0'.
892 * __packet_lookup_frame_in_block
893 * prb_retire_current_block()
894 * prb_dispatch_next_block()
895 * |->(BLOCK_STATUS == USER) evaluates to true
896 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
897 * 6) Now there are two cases:
898 * 6.1) Link goes idle right after the queue is frozen.
899 * But remember, the last open_block() refreshed the timer.
900 * When this timer expires,it will refresh itself so that we can
901 * re-open block-0 in near future.
902 * 6.2) Link is busy and keeps on receiving packets. This is a simple
903 * case and __packet_lookup_frame_in_block will check if block-0
904 * is free and can now be re-used.
906 static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
907 struct packet_sock *po)
909 pkc->reset_pending_on_curr_blk = 1;
910 po->stats.stats3.tp_freeze_q_cnt++;
913 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
916 * If the next block is free then we will dispatch it
917 * and return a good offset.
918 * Else, we will freeze the queue.
919 * So, caller must check the return value.
921 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
922 struct packet_sock *po)
924 struct tpacket_block_desc *pbd;
928 /* 1. Get current block num */
929 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
931 /* 2. If this block is currently in_use then freeze the queue */
932 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
933 prb_freeze_queue(pkc, po);
939 * open this block and return the offset where the first packet
940 * needs to get stored.
942 prb_open_block(pkc, pbd);
943 return (void *)pkc->nxt_offset;
946 static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
947 struct packet_sock *po, unsigned int status)
949 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
951 /* retire/close the current block */
952 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
954 * Plug the case where copy_bits() is in progress on
955 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
956 * have space to copy the pkt in the current block and
957 * called prb_retire_current_block()
959 * We don't need to worry about the TMO case because
960 * the timer-handler already handled this case.
962 if (!(status & TP_STATUS_BLK_TMO)) {
963 while (atomic_read(&pkc->blk_fill_in_prog)) {
964 /* Waiting for skb_copy_bits to finish... */
968 prb_close_block(pkc, pbd, po, status);
973 static int prb_curr_blk_in_use(struct tpacket_block_desc *pbd)
975 return TP_STATUS_USER & BLOCK_STATUS(pbd);
978 static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
980 return pkc->reset_pending_on_curr_blk;
983 static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
985 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
986 atomic_dec(&pkc->blk_fill_in_prog);
989 static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
990 struct tpacket3_hdr *ppd)
992 ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
995 static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
996 struct tpacket3_hdr *ppd)
998 ppd->hv1.tp_rxhash = 0;
1001 static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
1002 struct tpacket3_hdr *ppd)
1004 if (skb_vlan_tag_present(pkc->skb)) {
1005 ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
1006 ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
1007 ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
1009 ppd->hv1.tp_vlan_tci = 0;
1010 ppd->hv1.tp_vlan_tpid = 0;
1011 ppd->tp_status = TP_STATUS_AVAILABLE;
1015 static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
1016 struct tpacket3_hdr *ppd)
1018 ppd->hv1.tp_padding = 0;
1019 prb_fill_vlan_info(pkc, ppd);
1021 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
1022 prb_fill_rxhash(pkc, ppd);
1024 prb_clear_rxhash(pkc, ppd);
1027 static void prb_fill_curr_block(char *curr,
1028 struct tpacket_kbdq_core *pkc,
1029 struct tpacket_block_desc *pbd,
1032 struct tpacket3_hdr *ppd;
1034 ppd = (struct tpacket3_hdr *)curr;
1035 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1037 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1038 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1039 BLOCK_NUM_PKTS(pbd) += 1;
1040 atomic_inc(&pkc->blk_fill_in_prog);
1041 prb_run_all_ft_ops(pkc, ppd);
1044 /* Assumes caller has the sk->rx_queue.lock */
1045 static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1046 struct sk_buff *skb,
1051 struct tpacket_kbdq_core *pkc;
1052 struct tpacket_block_desc *pbd;
1055 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
1056 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1058 /* Queue is frozen when user space is lagging behind */
1059 if (prb_queue_frozen(pkc)) {
1061 * Check if that last block which caused the queue to freeze,
1062 * is still in_use by user-space.
1064 if (prb_curr_blk_in_use(pbd)) {
1065 /* Can't record this packet */
1069 * Ok, the block was released by user-space.
1070 * Now let's open that block.
1071 * opening a block also thaws the queue.
1072 * Thawing is a side effect.
1074 prb_open_block(pkc, pbd);
1079 curr = pkc->nxt_offset;
1081 end = (char *)pbd + pkc->kblk_size;
1083 /* first try the current block */
1084 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1085 prb_fill_curr_block(curr, pkc, pbd, len);
1086 return (void *)curr;
1089 /* Ok, close the current block */
1090 prb_retire_current_block(pkc, po, 0);
1092 /* Now, try to dispatch the next block */
1093 curr = (char *)prb_dispatch_next_block(pkc, po);
1095 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1096 prb_fill_curr_block(curr, pkc, pbd, len);
1097 return (void *)curr;
1101 * No free blocks are available.user_space hasn't caught up yet.
1102 * Queue was just frozen and now this packet will get dropped.
1107 static void *packet_current_rx_frame(struct packet_sock *po,
1108 struct sk_buff *skb,
1109 int status, unsigned int len)
1112 switch (po->tp_version) {
1115 curr = packet_lookup_frame(po, &po->rx_ring,
1116 po->rx_ring.head, status);
1119 return __packet_lookup_frame_in_block(po, skb, status, len);
1121 WARN(1, "TPACKET version not supported\n");
1127 static void *prb_lookup_block(struct packet_sock *po,
1128 struct packet_ring_buffer *rb,
1132 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1133 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
1135 if (status != BLOCK_STATUS(pbd))
1140 static int prb_previous_blk_num(struct packet_ring_buffer *rb)
1143 if (rb->prb_bdqc.kactive_blk_num)
1144 prev = rb->prb_bdqc.kactive_blk_num-1;
1146 prev = rb->prb_bdqc.knum_blocks-1;
1150 /* Assumes caller has held the rx_queue.lock */
1151 static void *__prb_previous_block(struct packet_sock *po,
1152 struct packet_ring_buffer *rb,
1155 unsigned int previous = prb_previous_blk_num(rb);
1156 return prb_lookup_block(po, rb, previous, status);
1159 static void *packet_previous_rx_frame(struct packet_sock *po,
1160 struct packet_ring_buffer *rb,
1163 if (po->tp_version <= TPACKET_V2)
1164 return packet_previous_frame(po, rb, status);
1166 return __prb_previous_block(po, rb, status);
1169 static void packet_increment_rx_head(struct packet_sock *po,
1170 struct packet_ring_buffer *rb)
1172 switch (po->tp_version) {
1175 return packet_increment_head(rb);
1178 WARN(1, "TPACKET version not supported.\n");
1184 static void *packet_previous_frame(struct packet_sock *po,
1185 struct packet_ring_buffer *rb,
1188 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1189 return packet_lookup_frame(po, rb, previous, status);
1192 static void packet_increment_head(struct packet_ring_buffer *buff)
1194 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1197 static void packet_inc_pending(struct packet_ring_buffer *rb)
1199 this_cpu_inc(*rb->pending_refcnt);
1202 static void packet_dec_pending(struct packet_ring_buffer *rb)
1204 this_cpu_dec(*rb->pending_refcnt);
1207 static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
1209 unsigned int refcnt = 0;
1212 /* We don't use pending refcount in rx_ring. */
1213 if (rb->pending_refcnt == NULL)
1216 for_each_possible_cpu(cpu)
1217 refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
1222 static int packet_alloc_pending(struct packet_sock *po)
1224 po->rx_ring.pending_refcnt = NULL;
1226 po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
1227 if (unlikely(po->tx_ring.pending_refcnt == NULL))
1233 static void packet_free_pending(struct packet_sock *po)
1235 free_percpu(po->tx_ring.pending_refcnt);
1238 #define ROOM_POW_OFF 2
1239 #define ROOM_NONE 0x0
1240 #define ROOM_LOW 0x1
1241 #define ROOM_NORMAL 0x2
1243 static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
1247 len = po->rx_ring.frame_max + 1;
1248 idx = po->rx_ring.head;
1250 idx += len >> pow_off;
1253 return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1256 static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
1260 len = po->rx_ring.prb_bdqc.knum_blocks;
1261 idx = po->rx_ring.prb_bdqc.kactive_blk_num;
1263 idx += len >> pow_off;
1266 return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1269 static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1271 struct sock *sk = &po->sk;
1272 int ret = ROOM_NONE;
1274 if (po->prot_hook.func != tpacket_rcv) {
1275 int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
1276 - (skb ? skb->truesize : 0);
1277 if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
1285 if (po->tp_version == TPACKET_V3) {
1286 if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
1288 else if (__tpacket_v3_has_room(po, 0))
1291 if (__tpacket_has_room(po, ROOM_POW_OFF))
1293 else if (__tpacket_has_room(po, 0))
1300 static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1305 spin_lock_bh(&po->sk.sk_receive_queue.lock);
1306 ret = __packet_rcv_has_room(po, skb);
1307 has_room = ret == ROOM_NORMAL;
1308 if (po->pressure == has_room)
1309 po->pressure = !has_room;
1310 spin_unlock_bh(&po->sk.sk_receive_queue.lock);
1315 static void packet_sock_destruct(struct sock *sk)
1317 skb_queue_purge(&sk->sk_error_queue);
1319 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1320 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
1322 if (!sock_flag(sk, SOCK_DEAD)) {
1323 pr_err("Attempt to release alive packet socket: %p\n", sk);
1327 sk_refcnt_debug_dec(sk);
1330 static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
1335 rxhash = skb_get_hash(skb);
1336 for (i = 0; i < ROLLOVER_HLEN; i++)
1337 if (po->rollover->history[i] == rxhash)
1340 po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash;
1341 return count > (ROLLOVER_HLEN >> 1);
1344 static unsigned int fanout_demux_hash(struct packet_fanout *f,
1345 struct sk_buff *skb,
1348 return reciprocal_scale(__skb_get_hash_symmetric(skb), num);
1351 static unsigned int fanout_demux_lb(struct packet_fanout *f,
1352 struct sk_buff *skb,
1355 unsigned int val = atomic_inc_return(&f->rr_cur);
1360 static unsigned int fanout_demux_cpu(struct packet_fanout *f,
1361 struct sk_buff *skb,
1364 return smp_processor_id() % num;
1367 static unsigned int fanout_demux_rnd(struct packet_fanout *f,
1368 struct sk_buff *skb,
1371 return prandom_u32_max(num);
1374 static unsigned int fanout_demux_rollover(struct packet_fanout *f,
1375 struct sk_buff *skb,
1376 unsigned int idx, bool try_self,
1379 struct packet_sock *po, *po_next, *po_skip = NULL;
1380 unsigned int i, j, room = ROOM_NONE;
1382 po = pkt_sk(f->arr[idx]);
1385 room = packet_rcv_has_room(po, skb);
1386 if (room == ROOM_NORMAL ||
1387 (room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
1392 i = j = min_t(int, po->rollover->sock, num - 1);
1394 po_next = pkt_sk(f->arr[i]);
1395 if (po_next != po_skip && !po_next->pressure &&
1396 packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
1398 po->rollover->sock = i;
1399 atomic_long_inc(&po->rollover->num);
1400 if (room == ROOM_LOW)
1401 atomic_long_inc(&po->rollover->num_huge);
1409 atomic_long_inc(&po->rollover->num_failed);
1413 static unsigned int fanout_demux_qm(struct packet_fanout *f,
1414 struct sk_buff *skb,
1417 return skb_get_queue_mapping(skb) % num;
1420 static unsigned int fanout_demux_bpf(struct packet_fanout *f,
1421 struct sk_buff *skb,
1424 struct bpf_prog *prog;
1425 unsigned int ret = 0;
1428 prog = rcu_dereference(f->bpf_prog);
1430 ret = bpf_prog_run_clear_cb(prog, skb) % num;
1436 static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
1438 return f->flags & (flag >> 8);
1441 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1442 struct packet_type *pt, struct net_device *orig_dev)
1444 struct packet_fanout *f = pt->af_packet_priv;
1445 unsigned int num = READ_ONCE(f->num_members);
1446 struct net *net = read_pnet(&f->net);
1447 struct packet_sock *po;
1450 if (!net_eq(dev_net(dev), net) || !num) {
1455 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
1456 skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET);
1461 case PACKET_FANOUT_HASH:
1463 idx = fanout_demux_hash(f, skb, num);
1465 case PACKET_FANOUT_LB:
1466 idx = fanout_demux_lb(f, skb, num);
1468 case PACKET_FANOUT_CPU:
1469 idx = fanout_demux_cpu(f, skb, num);
1471 case PACKET_FANOUT_RND:
1472 idx = fanout_demux_rnd(f, skb, num);
1474 case PACKET_FANOUT_QM:
1475 idx = fanout_demux_qm(f, skb, num);
1477 case PACKET_FANOUT_ROLLOVER:
1478 idx = fanout_demux_rollover(f, skb, 0, false, num);
1480 case PACKET_FANOUT_CBPF:
1481 case PACKET_FANOUT_EBPF:
1482 idx = fanout_demux_bpf(f, skb, num);
1486 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
1487 idx = fanout_demux_rollover(f, skb, idx, true, num);
1489 po = pkt_sk(f->arr[idx]);
1490 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1493 DEFINE_MUTEX(fanout_mutex);
1494 EXPORT_SYMBOL_GPL(fanout_mutex);
1495 static LIST_HEAD(fanout_list);
1496 static u16 fanout_next_id;
1498 static void __fanout_link(struct sock *sk, struct packet_sock *po)
1500 struct packet_fanout *f = po->fanout;
1502 spin_lock(&f->lock);
1503 f->arr[f->num_members] = sk;
1506 if (f->num_members == 1)
1507 dev_add_pack(&f->prot_hook);
1508 spin_unlock(&f->lock);
1511 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1513 struct packet_fanout *f = po->fanout;
1516 spin_lock(&f->lock);
1517 for (i = 0; i < f->num_members; i++) {
1518 if (f->arr[i] == sk)
1521 BUG_ON(i >= f->num_members);
1522 f->arr[i] = f->arr[f->num_members - 1];
1524 if (f->num_members == 0)
1525 __dev_remove_pack(&f->prot_hook);
1526 spin_unlock(&f->lock);
1529 static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
1531 if (sk->sk_family != PF_PACKET)
1534 return ptype->af_packet_priv == pkt_sk(sk)->fanout;
1537 static void fanout_init_data(struct packet_fanout *f)
1540 case PACKET_FANOUT_LB:
1541 atomic_set(&f->rr_cur, 0);
1543 case PACKET_FANOUT_CBPF:
1544 case PACKET_FANOUT_EBPF:
1545 RCU_INIT_POINTER(f->bpf_prog, NULL);
1550 static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
1552 struct bpf_prog *old;
1554 spin_lock(&f->lock);
1555 old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
1556 rcu_assign_pointer(f->bpf_prog, new);
1557 spin_unlock(&f->lock);
1561 bpf_prog_destroy(old);
1565 static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
1568 struct bpf_prog *new;
1569 struct sock_fprog fprog;
1572 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1574 if (len != sizeof(fprog))
1576 if (copy_from_user(&fprog, data, len))
1579 ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
1583 __fanout_set_data_bpf(po->fanout, new);
1587 static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
1590 struct bpf_prog *new;
1593 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1595 if (len != sizeof(fd))
1597 if (copy_from_user(&fd, data, len))
1600 new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
1602 return PTR_ERR(new);
1604 __fanout_set_data_bpf(po->fanout, new);
1608 static int fanout_set_data(struct packet_sock *po, char __user *data,
1611 switch (po->fanout->type) {
1612 case PACKET_FANOUT_CBPF:
1613 return fanout_set_data_cbpf(po, data, len);
1614 case PACKET_FANOUT_EBPF:
1615 return fanout_set_data_ebpf(po, data, len);
1621 static void fanout_release_data(struct packet_fanout *f)
1624 case PACKET_FANOUT_CBPF:
1625 case PACKET_FANOUT_EBPF:
1626 __fanout_set_data_bpf(f, NULL);
1630 static bool __fanout_id_is_free(struct sock *sk, u16 candidate_id)
1632 struct packet_fanout *f;
1634 list_for_each_entry(f, &fanout_list, list) {
1635 if (f->id == candidate_id &&
1636 read_pnet(&f->net) == sock_net(sk)) {
1643 static bool fanout_find_new_id(struct sock *sk, u16 *new_id)
1645 u16 id = fanout_next_id;
1648 if (__fanout_id_is_free(sk, id)) {
1650 fanout_next_id = id + 1;
1655 } while (id != fanout_next_id);
1660 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
1662 struct packet_rollover *rollover = NULL;
1663 struct packet_sock *po = pkt_sk(sk);
1664 struct packet_fanout *f, *match;
1665 u8 type = type_flags & 0xff;
1666 u8 flags = type_flags >> 8;
1670 case PACKET_FANOUT_ROLLOVER:
1671 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1673 case PACKET_FANOUT_HASH:
1674 case PACKET_FANOUT_LB:
1675 case PACKET_FANOUT_CPU:
1676 case PACKET_FANOUT_RND:
1677 case PACKET_FANOUT_QM:
1678 case PACKET_FANOUT_CBPF:
1679 case PACKET_FANOUT_EBPF:
1685 mutex_lock(&fanout_mutex);
1691 if (type == PACKET_FANOUT_ROLLOVER ||
1692 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1694 rollover = kzalloc(sizeof(*rollover), GFP_KERNEL);
1697 atomic_long_set(&rollover->num, 0);
1698 atomic_long_set(&rollover->num_huge, 0);
1699 atomic_long_set(&rollover->num_failed, 0);
1700 po->rollover = rollover;
1703 if (type_flags & PACKET_FANOUT_FLAG_UNIQUEID) {
1708 if (!fanout_find_new_id(sk, &id)) {
1712 /* ephemeral flag for the first socket in the group: drop it */
1713 flags &= ~(PACKET_FANOUT_FLAG_UNIQUEID >> 8);
1717 list_for_each_entry(f, &fanout_list, list) {
1719 read_pnet(&f->net) == sock_net(sk)) {
1725 if (match && match->flags != flags)
1729 match = kzalloc(sizeof(*match), GFP_KERNEL);
1732 write_pnet(&match->net, sock_net(sk));
1735 match->flags = flags;
1736 INIT_LIST_HEAD(&match->list);
1737 spin_lock_init(&match->lock);
1738 refcount_set(&match->sk_ref, 0);
1739 fanout_init_data(match);
1740 match->prot_hook.type = po->prot_hook.type;
1741 match->prot_hook.dev = po->prot_hook.dev;
1742 match->prot_hook.func = packet_rcv_fanout;
1743 match->prot_hook.af_packet_priv = match;
1744 match->prot_hook.id_match = match_fanout_group;
1745 list_add(&match->list, &fanout_list);
1749 spin_lock(&po->bind_lock);
1751 match->type == type &&
1752 match->prot_hook.type == po->prot_hook.type &&
1753 match->prot_hook.dev == po->prot_hook.dev) {
1755 if (refcount_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1756 __dev_remove_pack(&po->prot_hook);
1758 refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1);
1759 __fanout_link(sk, po);
1763 spin_unlock(&po->bind_lock);
1765 if (err && !refcount_read(&match->sk_ref)) {
1766 list_del(&match->list);
1771 if (err && rollover) {
1773 po->rollover = NULL;
1775 mutex_unlock(&fanout_mutex);
1779 /* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes
1780 * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout.
1781 * It is the responsibility of the caller to call fanout_release_data() and
1782 * free the returned packet_fanout (after synchronize_net())
1784 static struct packet_fanout *fanout_release(struct sock *sk)
1786 struct packet_sock *po = pkt_sk(sk);
1787 struct packet_fanout *f;
1789 mutex_lock(&fanout_mutex);
1794 if (refcount_dec_and_test(&f->sk_ref))
1800 kfree_rcu(po->rollover, rcu);
1802 mutex_unlock(&fanout_mutex);
1807 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1808 struct sk_buff *skb)
1810 /* Earlier code assumed this would be a VLAN pkt, double-check
1811 * this now that we have the actual packet in hand. We can only
1812 * do this check on Ethernet devices.
1814 if (unlikely(dev->type != ARPHRD_ETHER))
1817 skb_reset_mac_header(skb);
1818 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1821 static const struct proto_ops packet_ops;
1823 static const struct proto_ops packet_ops_spkt;
1825 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1826 struct packet_type *pt, struct net_device *orig_dev)
1829 struct sockaddr_pkt *spkt;
1832 * When we registered the protocol we saved the socket in the data
1833 * field for just this event.
1836 sk = pt->af_packet_priv;
1839 * Yank back the headers [hope the device set this
1840 * right or kerboom...]
1842 * Incoming packets have ll header pulled,
1845 * For outgoing ones skb->data == skb_mac_header(skb)
1846 * so that this procedure is noop.
1849 if (skb->pkt_type == PACKET_LOOPBACK)
1852 if (!net_eq(dev_net(dev), sock_net(sk)))
1855 skb = skb_share_check(skb, GFP_ATOMIC);
1859 /* drop any routing info */
1862 /* drop conntrack reference */
1865 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1867 skb_push(skb, skb->data - skb_mac_header(skb));
1870 * The SOCK_PACKET socket receives _all_ frames.
1873 spkt->spkt_family = dev->type;
1874 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1875 spkt->spkt_protocol = skb->protocol;
1878 * Charge the memory to the socket. This is done specifically
1879 * to prevent sockets using all the memory up.
1882 if (sock_queue_rcv_skb(sk, skb) == 0)
1893 * Output a raw packet to a device layer. This bypasses all the other
1894 * protocol layers and you must therefore supply it with a complete frame
1897 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1900 struct sock *sk = sock->sk;
1901 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1902 struct sk_buff *skb = NULL;
1903 struct net_device *dev;
1904 struct sockcm_cookie sockc;
1910 * Get and verify the address.
1914 if (msg->msg_namelen < sizeof(struct sockaddr))
1916 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1917 proto = saddr->spkt_protocol;
1919 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1922 * Find the device first to size check it
1925 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1928 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1934 if (!(dev->flags & IFF_UP))
1938 * You may not queue a frame bigger than the mtu. This is the lowest level
1939 * raw protocol and you must do your own fragmentation at this level.
1942 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1943 if (!netif_supports_nofcs(dev)) {
1944 err = -EPROTONOSUPPORT;
1947 extra_len = 4; /* We're doing our own CRC */
1951 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1955 size_t reserved = LL_RESERVED_SPACE(dev);
1956 int tlen = dev->needed_tailroom;
1957 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1960 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1963 /* FIXME: Save some space for broken drivers that write a hard
1964 * header at transmission time by themselves. PPP is the notable
1965 * one here. This should really be fixed at the driver level.
1967 skb_reserve(skb, reserved);
1968 skb_reset_network_header(skb);
1970 /* Try to align data part correctly */
1975 skb_reset_network_header(skb);
1977 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1983 if (!dev_validate_header(dev, skb->data, len)) {
1987 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1988 !packet_extra_vlan_len_allowed(dev, skb)) {
1993 sockc.tsflags = sk->sk_tsflags;
1994 if (msg->msg_controllen) {
1995 err = sock_cmsg_send(sk, msg, &sockc);
2000 skb->protocol = proto;
2002 skb->priority = sk->sk_priority;
2003 skb->mark = sk->sk_mark;
2005 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2007 if (unlikely(extra_len == 4))
2010 skb_probe_transport_header(skb, 0);
2012 dev_queue_xmit(skb);
2023 static unsigned int run_filter(struct sk_buff *skb,
2024 const struct sock *sk,
2027 struct sk_filter *filter;
2030 filter = rcu_dereference(sk->sk_filter);
2032 res = bpf_prog_run_clear_cb(filter->prog, skb);
2038 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
2041 struct virtio_net_hdr vnet_hdr;
2043 if (*len < sizeof(vnet_hdr))
2045 *len -= sizeof(vnet_hdr);
2047 if (virtio_net_hdr_from_skb(skb, &vnet_hdr, vio_le(), true))
2050 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
2054 * This function makes lazy skb cloning in hope that most of packets
2055 * are discarded by BPF.
2057 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2058 * and skb->cb are mangled. It works because (and until) packets
2059 * falling here are owned by current CPU. Output packets are cloned
2060 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2061 * sequencially, so that if we return skb to original state on exit,
2062 * we will not harm anyone.
2065 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2066 struct packet_type *pt, struct net_device *orig_dev)
2069 struct sockaddr_ll *sll;
2070 struct packet_sock *po;
2071 u8 *skb_head = skb->data;
2072 int skb_len = skb->len;
2073 unsigned int snaplen, res;
2074 bool is_drop_n_account = false;
2076 if (skb->pkt_type == PACKET_LOOPBACK)
2079 sk = pt->af_packet_priv;
2082 if (!net_eq(dev_net(dev), sock_net(sk)))
2087 if (dev->header_ops) {
2088 /* The device has an explicit notion of ll header,
2089 * exported to higher levels.
2091 * Otherwise, the device hides details of its frame
2092 * structure, so that corresponding packet head is
2093 * never delivered to user.
2095 if (sk->sk_type != SOCK_DGRAM)
2096 skb_push(skb, skb->data - skb_mac_header(skb));
2097 else if (skb->pkt_type == PACKET_OUTGOING) {
2098 /* Special case: outgoing packets have ll header at head */
2099 skb_pull(skb, skb_network_offset(skb));
2105 res = run_filter(skb, sk, snaplen);
2107 goto drop_n_restore;
2111 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2114 if (skb_shared(skb)) {
2115 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2119 if (skb_head != skb->data) {
2120 skb->data = skb_head;
2127 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2129 sll = &PACKET_SKB_CB(skb)->sa.ll;
2130 sll->sll_hatype = dev->type;
2131 sll->sll_pkttype = skb->pkt_type;
2132 if (unlikely(po->origdev))
2133 sll->sll_ifindex = orig_dev->ifindex;
2135 sll->sll_ifindex = dev->ifindex;
2137 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2139 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2140 * Use their space for storing the original skb length.
2142 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2144 if (pskb_trim(skb, snaplen))
2147 skb_set_owner_r(skb, sk);
2151 /* drop conntrack reference */
2154 spin_lock(&sk->sk_receive_queue.lock);
2155 po->stats.stats1.tp_packets++;
2156 sock_skb_set_dropcount(sk, skb);
2157 __skb_queue_tail(&sk->sk_receive_queue, skb);
2158 spin_unlock(&sk->sk_receive_queue.lock);
2159 sk->sk_data_ready(sk);
2163 is_drop_n_account = true;
2164 spin_lock(&sk->sk_receive_queue.lock);
2165 po->stats.stats1.tp_drops++;
2166 atomic_inc(&sk->sk_drops);
2167 spin_unlock(&sk->sk_receive_queue.lock);
2170 if (skb_head != skb->data && skb_shared(skb)) {
2171 skb->data = skb_head;
2175 if (!is_drop_n_account)
2182 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2183 struct packet_type *pt, struct net_device *orig_dev)
2186 struct packet_sock *po;
2187 struct sockaddr_ll *sll;
2188 union tpacket_uhdr h;
2189 u8 *skb_head = skb->data;
2190 int skb_len = skb->len;
2191 unsigned int snaplen, res;
2192 unsigned long status = TP_STATUS_USER;
2193 unsigned short macoff, netoff, hdrlen;
2194 struct sk_buff *copy_skb = NULL;
2197 bool is_drop_n_account = false;
2198 bool do_vnet = false;
2200 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2201 * We may add members to them until current aligned size without forcing
2202 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2204 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2205 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2207 if (skb->pkt_type == PACKET_LOOPBACK)
2210 sk = pt->af_packet_priv;
2213 if (!net_eq(dev_net(dev), sock_net(sk)))
2216 if (dev->header_ops) {
2217 if (sk->sk_type != SOCK_DGRAM)
2218 skb_push(skb, skb->data - skb_mac_header(skb));
2219 else if (skb->pkt_type == PACKET_OUTGOING) {
2220 /* Special case: outgoing packets have ll header at head */
2221 skb_pull(skb, skb_network_offset(skb));
2227 res = run_filter(skb, sk, snaplen);
2229 goto drop_n_restore;
2231 if (skb->ip_summed == CHECKSUM_PARTIAL)
2232 status |= TP_STATUS_CSUMNOTREADY;
2233 else if (skb->pkt_type != PACKET_OUTGOING &&
2234 (skb->ip_summed == CHECKSUM_COMPLETE ||
2235 skb_csum_unnecessary(skb)))
2236 status |= TP_STATUS_CSUM_VALID;
2241 if (sk->sk_type == SOCK_DGRAM) {
2242 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2245 unsigned int maclen = skb_network_offset(skb);
2246 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2247 (maclen < 16 ? 16 : maclen)) +
2249 if (po->has_vnet_hdr) {
2250 netoff += sizeof(struct virtio_net_hdr);
2253 macoff = netoff - maclen;
2255 if (po->tp_version <= TPACKET_V2) {
2256 if (macoff + snaplen > po->rx_ring.frame_size) {
2257 if (po->copy_thresh &&
2258 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2259 if (skb_shared(skb)) {
2260 copy_skb = skb_clone(skb, GFP_ATOMIC);
2262 copy_skb = skb_get(skb);
2263 skb_head = skb->data;
2266 skb_set_owner_r(copy_skb, sk);
2268 snaplen = po->rx_ring.frame_size - macoff;
2269 if ((int)snaplen < 0) {
2274 } else if (unlikely(macoff + snaplen >
2275 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2278 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2279 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2280 snaplen, nval, macoff);
2282 if (unlikely((int)snaplen < 0)) {
2284 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2288 spin_lock(&sk->sk_receive_queue.lock);
2289 h.raw = packet_current_rx_frame(po, skb,
2290 TP_STATUS_KERNEL, (macoff+snaplen));
2292 goto drop_n_account;
2293 if (po->tp_version <= TPACKET_V2) {
2294 packet_increment_rx_head(po, &po->rx_ring);
2296 * LOSING will be reported till you read the stats,
2297 * because it's COR - Clear On Read.
2298 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2301 if (po->stats.stats1.tp_drops)
2302 status |= TP_STATUS_LOSING;
2304 po->stats.stats1.tp_packets++;
2306 status |= TP_STATUS_COPY;
2307 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2309 spin_unlock(&sk->sk_receive_queue.lock);
2312 if (virtio_net_hdr_from_skb(skb, h.raw + macoff -
2313 sizeof(struct virtio_net_hdr),
2315 spin_lock(&sk->sk_receive_queue.lock);
2316 goto drop_n_account;
2320 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2322 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2323 getnstimeofday(&ts);
2325 status |= ts_status;
2327 switch (po->tp_version) {
2329 h.h1->tp_len = skb->len;
2330 h.h1->tp_snaplen = snaplen;
2331 h.h1->tp_mac = macoff;
2332 h.h1->tp_net = netoff;
2333 h.h1->tp_sec = ts.tv_sec;
2334 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2335 hdrlen = sizeof(*h.h1);
2338 h.h2->tp_len = skb->len;
2339 h.h2->tp_snaplen = snaplen;
2340 h.h2->tp_mac = macoff;
2341 h.h2->tp_net = netoff;
2342 h.h2->tp_sec = ts.tv_sec;
2343 h.h2->tp_nsec = ts.tv_nsec;
2344 if (skb_vlan_tag_present(skb)) {
2345 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2346 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2347 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2349 h.h2->tp_vlan_tci = 0;
2350 h.h2->tp_vlan_tpid = 0;
2352 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2353 hdrlen = sizeof(*h.h2);
2356 /* tp_nxt_offset,vlan are already populated above.
2357 * So DONT clear those fields here
2359 h.h3->tp_status |= status;
2360 h.h3->tp_len = skb->len;
2361 h.h3->tp_snaplen = snaplen;
2362 h.h3->tp_mac = macoff;
2363 h.h3->tp_net = netoff;
2364 h.h3->tp_sec = ts.tv_sec;
2365 h.h3->tp_nsec = ts.tv_nsec;
2366 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2367 hdrlen = sizeof(*h.h3);
2373 sll = h.raw + TPACKET_ALIGN(hdrlen);
2374 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2375 sll->sll_family = AF_PACKET;
2376 sll->sll_hatype = dev->type;
2377 sll->sll_protocol = skb->protocol;
2378 sll->sll_pkttype = skb->pkt_type;
2379 if (unlikely(po->origdev))
2380 sll->sll_ifindex = orig_dev->ifindex;
2382 sll->sll_ifindex = dev->ifindex;
2386 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2387 if (po->tp_version <= TPACKET_V2) {
2390 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2393 for (start = h.raw; start < end; start += PAGE_SIZE)
2394 flush_dcache_page(pgv_to_page(start));
2399 if (po->tp_version <= TPACKET_V2) {
2400 __packet_set_status(po, h.raw, status);
2401 sk->sk_data_ready(sk);
2403 prb_clear_blk_fill_status(&po->rx_ring);
2407 if (skb_head != skb->data && skb_shared(skb)) {
2408 skb->data = skb_head;
2412 if (!is_drop_n_account)
2419 is_drop_n_account = true;
2420 po->stats.stats1.tp_drops++;
2421 spin_unlock(&sk->sk_receive_queue.lock);
2423 sk->sk_data_ready(sk);
2424 kfree_skb(copy_skb);
2425 goto drop_n_restore;
2428 static void tpacket_destruct_skb(struct sk_buff *skb)
2430 struct packet_sock *po = pkt_sk(skb->sk);
2432 if (likely(po->tx_ring.pg_vec)) {
2436 ph = skb_shinfo(skb)->destructor_arg;
2437 packet_dec_pending(&po->tx_ring);
2439 ts = __packet_set_timestamp(po, ph, skb);
2440 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2446 static void tpacket_set_protocol(const struct net_device *dev,
2447 struct sk_buff *skb)
2449 if (dev->type == ARPHRD_ETHER) {
2450 skb_reset_mac_header(skb);
2451 skb->protocol = eth_hdr(skb)->h_proto;
2455 static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2457 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2458 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2459 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2460 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2461 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2462 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2463 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2465 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2471 static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2472 struct virtio_net_hdr *vnet_hdr)
2474 if (*len < sizeof(*vnet_hdr))
2476 *len -= sizeof(*vnet_hdr);
2478 if (!copy_from_iter_full(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter))
2481 return __packet_snd_vnet_parse(vnet_hdr, *len);
2484 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2485 void *frame, struct net_device *dev, void *data, int tp_len,
2486 __be16 proto, unsigned char *addr, int hlen, int copylen,
2487 const struct sockcm_cookie *sockc)
2489 union tpacket_uhdr ph;
2490 int to_write, offset, len, nr_frags, len_max;
2491 struct socket *sock = po->sk.sk_socket;
2497 skb->protocol = proto;
2499 skb->priority = po->sk.sk_priority;
2500 skb->mark = po->sk.sk_mark;
2501 sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
2502 skb_shinfo(skb)->destructor_arg = ph.raw;
2504 skb_reserve(skb, hlen);
2505 skb_reset_network_header(skb);
2509 if (sock->type == SOCK_DGRAM) {
2510 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2512 if (unlikely(err < 0))
2514 } else if (copylen) {
2515 int hdrlen = min_t(int, copylen, tp_len);
2517 skb_push(skb, dev->hard_header_len);
2518 skb_put(skb, copylen - dev->hard_header_len);
2519 err = skb_store_bits(skb, 0, data, hdrlen);
2522 if (!dev_validate_header(dev, skb->data, hdrlen))
2525 tpacket_set_protocol(dev, skb);
2531 offset = offset_in_page(data);
2532 len_max = PAGE_SIZE - offset;
2533 len = ((to_write > len_max) ? len_max : to_write);
2535 skb->data_len = to_write;
2536 skb->len += to_write;
2537 skb->truesize += to_write;
2538 refcount_add(to_write, &po->sk.sk_wmem_alloc);
2540 while (likely(to_write)) {
2541 nr_frags = skb_shinfo(skb)->nr_frags;
2543 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2544 pr_err("Packet exceed the number of skb frags(%lu)\n",
2549 page = pgv_to_page(data);
2551 flush_dcache_page(page);
2553 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2556 len_max = PAGE_SIZE;
2557 len = ((to_write > len_max) ? len_max : to_write);
2560 skb_probe_transport_header(skb, 0);
2565 static int tpacket_parse_header(struct packet_sock *po, void *frame,
2566 int size_max, void **data)
2568 union tpacket_uhdr ph;
2573 switch (po->tp_version) {
2575 if (ph.h3->tp_next_offset != 0) {
2576 pr_warn_once("variable sized slot not supported");
2579 tp_len = ph.h3->tp_len;
2582 tp_len = ph.h2->tp_len;
2585 tp_len = ph.h1->tp_len;
2588 if (unlikely(tp_len > size_max)) {
2589 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2593 if (unlikely(po->tp_tx_has_off)) {
2594 int off_min, off_max;
2596 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2597 off_max = po->tx_ring.frame_size - tp_len;
2598 if (po->sk.sk_type == SOCK_DGRAM) {
2599 switch (po->tp_version) {
2601 off = ph.h3->tp_net;
2604 off = ph.h2->tp_net;
2607 off = ph.h1->tp_net;
2611 switch (po->tp_version) {
2613 off = ph.h3->tp_mac;
2616 off = ph.h2->tp_mac;
2619 off = ph.h1->tp_mac;
2623 if (unlikely((off < off_min) || (off_max < off)))
2626 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2629 *data = frame + off;
2633 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2635 struct sk_buff *skb;
2636 struct net_device *dev;
2637 struct virtio_net_hdr *vnet_hdr = NULL;
2638 struct sockcm_cookie sockc;
2640 int err, reserve = 0;
2642 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2643 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2644 int tp_len, size_max;
2645 unsigned char *addr;
2648 int status = TP_STATUS_AVAILABLE;
2649 int hlen, tlen, copylen = 0;
2651 mutex_lock(&po->pg_vec_lock);
2653 if (likely(saddr == NULL)) {
2654 dev = packet_cached_dev_get(po);
2659 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2661 if (msg->msg_namelen < (saddr->sll_halen
2662 + offsetof(struct sockaddr_ll,
2665 proto = saddr->sll_protocol;
2666 addr = saddr->sll_addr;
2667 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2671 if (unlikely(dev == NULL))
2674 if (unlikely(!(dev->flags & IFF_UP)))
2677 sockc.tsflags = po->sk.sk_tsflags;
2678 if (msg->msg_controllen) {
2679 err = sock_cmsg_send(&po->sk, msg, &sockc);
2684 if (po->sk.sk_socket->type == SOCK_RAW)
2685 reserve = dev->hard_header_len;
2686 size_max = po->tx_ring.frame_size
2687 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2689 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
2690 size_max = dev->mtu + reserve + VLAN_HLEN;
2693 ph = packet_current_frame(po, &po->tx_ring,
2694 TP_STATUS_SEND_REQUEST);
2695 if (unlikely(ph == NULL)) {
2696 if (need_wait && need_resched())
2702 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2706 status = TP_STATUS_SEND_REQUEST;
2707 hlen = LL_RESERVED_SPACE(dev);
2708 tlen = dev->needed_tailroom;
2709 if (po->has_vnet_hdr) {
2711 data += sizeof(*vnet_hdr);
2712 tp_len -= sizeof(*vnet_hdr);
2714 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2718 copylen = __virtio16_to_cpu(vio_le(),
2721 copylen = max_t(int, copylen, dev->hard_header_len);
2722 skb = sock_alloc_send_skb(&po->sk,
2723 hlen + tlen + sizeof(struct sockaddr_ll) +
2724 (copylen - dev->hard_header_len),
2727 if (unlikely(skb == NULL)) {
2728 /* we assume the socket was initially writeable ... */
2729 if (likely(len_sum > 0))
2733 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
2734 addr, hlen, copylen, &sockc);
2735 if (likely(tp_len >= 0) &&
2736 tp_len > dev->mtu + reserve &&
2737 !po->has_vnet_hdr &&
2738 !packet_extra_vlan_len_allowed(dev, skb))
2741 if (unlikely(tp_len < 0)) {
2744 __packet_set_status(po, ph,
2745 TP_STATUS_AVAILABLE);
2746 packet_increment_head(&po->tx_ring);
2750 status = TP_STATUS_WRONG_FORMAT;
2756 if (po->has_vnet_hdr && virtio_net_hdr_to_skb(skb, vnet_hdr,
2762 skb->destructor = tpacket_destruct_skb;
2763 __packet_set_status(po, ph, TP_STATUS_SENDING);
2764 packet_inc_pending(&po->tx_ring);
2766 status = TP_STATUS_SEND_REQUEST;
2767 err = po->xmit(skb);
2768 if (unlikely(err > 0)) {
2769 err = net_xmit_errno(err);
2770 if (err && __packet_get_status(po, ph) ==
2771 TP_STATUS_AVAILABLE) {
2772 /* skb was destructed already */
2777 * skb was dropped but not destructed yet;
2778 * let's treat it like congestion or err < 0
2782 packet_increment_head(&po->tx_ring);
2784 } while (likely((ph != NULL) ||
2785 /* Note: packet_read_pending() might be slow if we have
2786 * to call it as it's per_cpu variable, but in fast-path
2787 * we already short-circuit the loop with the first
2788 * condition, and luckily don't have to go that path
2791 (need_wait && packet_read_pending(&po->tx_ring))));
2797 __packet_set_status(po, ph, status);
2802 mutex_unlock(&po->pg_vec_lock);
2806 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2807 size_t reserve, size_t len,
2808 size_t linear, int noblock,
2811 struct sk_buff *skb;
2813 /* Under a page? Don't bother with paged skb. */
2814 if (prepad + len < PAGE_SIZE || !linear)
2817 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2822 skb_reserve(skb, reserve);
2823 skb_put(skb, linear);
2824 skb->data_len = len - linear;
2825 skb->len += len - linear;
2830 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2832 struct sock *sk = sock->sk;
2833 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2834 struct sk_buff *skb;
2835 struct net_device *dev;
2837 unsigned char *addr;
2838 int err, reserve = 0;
2839 struct sockcm_cookie sockc;
2840 struct virtio_net_hdr vnet_hdr = { 0 };
2842 struct packet_sock *po = pkt_sk(sk);
2843 int hlen, tlen, linear;
2847 * Get and verify the address.
2850 if (likely(saddr == NULL)) {
2851 dev = packet_cached_dev_get(po);
2856 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2858 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2860 proto = saddr->sll_protocol;
2861 addr = saddr->sll_addr;
2862 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2866 if (unlikely(dev == NULL))
2869 if (unlikely(!(dev->flags & IFF_UP)))
2872 sockc.tsflags = sk->sk_tsflags;
2873 sockc.mark = sk->sk_mark;
2874 if (msg->msg_controllen) {
2875 err = sock_cmsg_send(sk, msg, &sockc);
2880 if (sock->type == SOCK_RAW)
2881 reserve = dev->hard_header_len;
2882 if (po->has_vnet_hdr) {
2883 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2888 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2889 if (!netif_supports_nofcs(dev)) {
2890 err = -EPROTONOSUPPORT;
2893 extra_len = 4; /* We're doing our own CRC */
2897 if (!vnet_hdr.gso_type &&
2898 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2902 hlen = LL_RESERVED_SPACE(dev);
2903 tlen = dev->needed_tailroom;
2904 linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len);
2905 linear = max(linear, min_t(int, len, dev->hard_header_len));
2906 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear,
2907 msg->msg_flags & MSG_DONTWAIT, &err);
2911 skb_set_network_header(skb, reserve);
2914 if (sock->type == SOCK_DGRAM) {
2915 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2916 if (unlikely(offset < 0))
2920 /* Returns -EFAULT on error */
2921 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2925 if (sock->type == SOCK_RAW &&
2926 !dev_validate_header(dev, skb->data, len)) {
2931 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2933 if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
2934 !packet_extra_vlan_len_allowed(dev, skb)) {
2939 skb->protocol = proto;
2941 skb->priority = sk->sk_priority;
2942 skb->mark = sockc.mark;
2944 if (po->has_vnet_hdr) {
2945 err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le());
2948 len += sizeof(vnet_hdr);
2951 skb_probe_transport_header(skb, reserve);
2953 if (unlikely(extra_len == 4))
2956 err = po->xmit(skb);
2957 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2973 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2975 struct sock *sk = sock->sk;
2976 struct packet_sock *po = pkt_sk(sk);
2978 if (po->tx_ring.pg_vec)
2979 return tpacket_snd(po, msg);
2981 return packet_snd(sock, msg, len);
2985 * Close a PACKET socket. This is fairly simple. We immediately go
2986 * to 'closed' state and remove our protocol entry in the device list.
2989 static int packet_release(struct socket *sock)
2991 struct sock *sk = sock->sk;
2992 struct packet_sock *po;
2993 struct packet_fanout *f;
2995 union tpacket_req_u req_u;
3003 mutex_lock(&net->packet.sklist_lock);
3004 sk_del_node_init_rcu(sk);
3005 mutex_unlock(&net->packet.sklist_lock);
3008 sock_prot_inuse_add(net, sk->sk_prot, -1);
3011 spin_lock(&po->bind_lock);
3012 unregister_prot_hook(sk, false);
3013 packet_cached_dev_reset(po);
3015 if (po->prot_hook.dev) {
3016 dev_put(po->prot_hook.dev);
3017 po->prot_hook.dev = NULL;
3019 spin_unlock(&po->bind_lock);
3021 packet_flush_mclist(sk);
3023 if (po->rx_ring.pg_vec) {
3024 memset(&req_u, 0, sizeof(req_u));
3025 packet_set_ring(sk, &req_u, 1, 0);
3028 if (po->tx_ring.pg_vec) {
3029 memset(&req_u, 0, sizeof(req_u));
3030 packet_set_ring(sk, &req_u, 1, 1);
3033 f = fanout_release(sk);
3038 fanout_release_data(f);
3042 * Now the socket is dead. No more input will appear.
3049 skb_queue_purge(&sk->sk_receive_queue);
3050 packet_free_pending(po);
3051 sk_refcnt_debug_release(sk);
3058 * Attach a packet hook.
3061 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3064 struct packet_sock *po = pkt_sk(sk);
3065 struct net_device *dev_curr;
3068 struct net_device *dev = NULL;
3070 bool unlisted = false;
3076 spin_lock(&po->bind_lock);
3080 dev = dev_get_by_name_rcu(sock_net(sk), name);
3085 } else if (ifindex) {
3086 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3096 proto_curr = po->prot_hook.type;
3097 dev_curr = po->prot_hook.dev;
3099 need_rehook = proto_curr != proto || dev_curr != dev;
3104 __unregister_prot_hook(sk, true);
3106 dev_curr = po->prot_hook.dev;
3108 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3113 po->prot_hook.type = proto;
3115 if (unlikely(unlisted)) {
3117 po->prot_hook.dev = NULL;
3119 packet_cached_dev_reset(po);
3121 po->prot_hook.dev = dev;
3122 po->ifindex = dev ? dev->ifindex : 0;
3123 packet_cached_dev_assign(po, dev);
3129 if (proto == 0 || !need_rehook)
3132 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3133 register_prot_hook(sk);
3135 sk->sk_err = ENETDOWN;
3136 if (!sock_flag(sk, SOCK_DEAD))
3137 sk->sk_error_report(sk);
3142 spin_unlock(&po->bind_lock);
3148 * Bind a packet socket to a device
3151 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3154 struct sock *sk = sock->sk;
3155 char name[sizeof(uaddr->sa_data) + 1];
3161 if (addr_len != sizeof(struct sockaddr))
3163 /* uaddr->sa_data comes from the userspace, it's not guaranteed to be
3166 memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data));
3167 name[sizeof(uaddr->sa_data)] = 0;
3169 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3172 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3174 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3175 struct sock *sk = sock->sk;
3181 if (addr_len < sizeof(struct sockaddr_ll))
3183 if (sll->sll_family != AF_PACKET)
3186 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3187 sll->sll_protocol ? : pkt_sk(sk)->num);
3190 static struct proto packet_proto = {
3192 .owner = THIS_MODULE,
3193 .obj_size = sizeof(struct packet_sock),
3197 * Create a packet of type SOCK_PACKET.
3200 static int packet_create(struct net *net, struct socket *sock, int protocol,
3204 struct packet_sock *po;
3205 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3208 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3210 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3211 sock->type != SOCK_PACKET)
3212 return -ESOCKTNOSUPPORT;
3214 sock->state = SS_UNCONNECTED;
3217 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3221 sock->ops = &packet_ops;
3222 if (sock->type == SOCK_PACKET)
3223 sock->ops = &packet_ops_spkt;
3225 sock_init_data(sock, sk);
3228 sk->sk_family = PF_PACKET;
3230 po->xmit = dev_queue_xmit;
3232 err = packet_alloc_pending(po);
3236 packet_cached_dev_reset(po);
3238 sk->sk_destruct = packet_sock_destruct;
3239 sk_refcnt_debug_inc(sk);
3242 * Attach a protocol block
3245 spin_lock_init(&po->bind_lock);
3246 mutex_init(&po->pg_vec_lock);
3247 po->rollover = NULL;
3248 po->prot_hook.func = packet_rcv;
3250 if (sock->type == SOCK_PACKET)
3251 po->prot_hook.func = packet_rcv_spkt;
3253 po->prot_hook.af_packet_priv = sk;
3256 po->prot_hook.type = proto;
3257 register_prot_hook(sk);
3260 mutex_lock(&net->packet.sklist_lock);
3261 sk_add_node_rcu(sk, &net->packet.sklist);
3262 mutex_unlock(&net->packet.sklist_lock);
3265 sock_prot_inuse_add(net, &packet_proto, 1);
3276 * Pull a packet from our receive queue and hand it to the user.
3277 * If necessary we block.
3280 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3283 struct sock *sk = sock->sk;
3284 struct sk_buff *skb;
3286 int vnet_hdr_len = 0;
3287 unsigned int origlen = 0;
3290 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3294 /* What error should we return now? EUNATTACH? */
3295 if (pkt_sk(sk)->ifindex < 0)
3299 if (flags & MSG_ERRQUEUE) {
3300 err = sock_recv_errqueue(sk, msg, len,
3301 SOL_PACKET, PACKET_TX_TIMESTAMP);
3306 * Call the generic datagram receiver. This handles all sorts
3307 * of horrible races and re-entrancy so we can forget about it
3308 * in the protocol layers.
3310 * Now it will return ENETDOWN, if device have just gone down,
3311 * but then it will block.
3314 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3317 * An error occurred so return it. Because skb_recv_datagram()
3318 * handles the blocking we don't see and worry about blocking
3325 if (pkt_sk(sk)->pressure)
3326 packet_rcv_has_room(pkt_sk(sk), NULL);
3328 if (pkt_sk(sk)->has_vnet_hdr) {
3329 err = packet_rcv_vnet(msg, skb, &len);
3332 vnet_hdr_len = sizeof(struct virtio_net_hdr);
3335 /* You lose any data beyond the buffer you gave. If it worries
3336 * a user program they can ask the device for its MTU
3342 msg->msg_flags |= MSG_TRUNC;
3345 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3349 if (sock->type != SOCK_PACKET) {
3350 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3352 /* Original length was stored in sockaddr_ll fields */
3353 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3354 sll->sll_family = AF_PACKET;
3355 sll->sll_protocol = skb->protocol;
3358 sock_recv_ts_and_drops(msg, sk, skb);
3360 if (msg->msg_name) {
3361 /* If the address length field is there to be filled
3362 * in, we fill it in now.
3364 if (sock->type == SOCK_PACKET) {
3365 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3366 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3368 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3370 msg->msg_namelen = sll->sll_halen +
3371 offsetof(struct sockaddr_ll, sll_addr);
3373 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
3377 if (pkt_sk(sk)->auxdata) {
3378 struct tpacket_auxdata aux;
3380 aux.tp_status = TP_STATUS_USER;
3381 if (skb->ip_summed == CHECKSUM_PARTIAL)
3382 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3383 else if (skb->pkt_type != PACKET_OUTGOING &&
3384 (skb->ip_summed == CHECKSUM_COMPLETE ||
3385 skb_csum_unnecessary(skb)))
3386 aux.tp_status |= TP_STATUS_CSUM_VALID;
3388 aux.tp_len = origlen;
3389 aux.tp_snaplen = skb->len;
3391 aux.tp_net = skb_network_offset(skb);
3392 if (skb_vlan_tag_present(skb)) {
3393 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3394 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3395 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3397 aux.tp_vlan_tci = 0;
3398 aux.tp_vlan_tpid = 0;
3400 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3404 * Free or return the buffer as appropriate. Again this
3405 * hides all the races and re-entrancy issues from us.
3407 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3410 skb_free_datagram(sk, skb);
3415 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3416 int *uaddr_len, int peer)
3418 struct net_device *dev;
3419 struct sock *sk = sock->sk;
3424 uaddr->sa_family = AF_PACKET;
3425 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3427 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3429 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3431 *uaddr_len = sizeof(*uaddr);
3436 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3437 int *uaddr_len, int peer)
3439 struct net_device *dev;
3440 struct sock *sk = sock->sk;
3441 struct packet_sock *po = pkt_sk(sk);
3442 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3447 sll->sll_family = AF_PACKET;
3448 sll->sll_ifindex = po->ifindex;
3449 sll->sll_protocol = po->num;
3450 sll->sll_pkttype = 0;
3452 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
3454 sll->sll_hatype = dev->type;
3455 sll->sll_halen = dev->addr_len;
3456 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3458 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3462 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3467 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3471 case PACKET_MR_MULTICAST:
3472 if (i->alen != dev->addr_len)
3475 return dev_mc_add(dev, i->addr);
3477 return dev_mc_del(dev, i->addr);
3479 case PACKET_MR_PROMISC:
3480 return dev_set_promiscuity(dev, what);
3481 case PACKET_MR_ALLMULTI:
3482 return dev_set_allmulti(dev, what);
3483 case PACKET_MR_UNICAST:
3484 if (i->alen != dev->addr_len)
3487 return dev_uc_add(dev, i->addr);
3489 return dev_uc_del(dev, i->addr);
3497 static void packet_dev_mclist_delete(struct net_device *dev,
3498 struct packet_mclist **mlp)
3500 struct packet_mclist *ml;
3502 while ((ml = *mlp) != NULL) {
3503 if (ml->ifindex == dev->ifindex) {
3504 packet_dev_mc(dev, ml, -1);
3512 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3514 struct packet_sock *po = pkt_sk(sk);
3515 struct packet_mclist *ml, *i;
3516 struct net_device *dev;
3522 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3527 if (mreq->mr_alen > dev->addr_len)
3531 i = kmalloc(sizeof(*i), GFP_KERNEL);
3536 for (ml = po->mclist; ml; ml = ml->next) {
3537 if (ml->ifindex == mreq->mr_ifindex &&
3538 ml->type == mreq->mr_type &&
3539 ml->alen == mreq->mr_alen &&
3540 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3542 /* Free the new element ... */
3548 i->type = mreq->mr_type;
3549 i->ifindex = mreq->mr_ifindex;
3550 i->alen = mreq->mr_alen;
3551 memcpy(i->addr, mreq->mr_address, i->alen);
3552 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
3554 i->next = po->mclist;
3556 err = packet_dev_mc(dev, i, 1);
3558 po->mclist = i->next;
3567 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3569 struct packet_mclist *ml, **mlp;
3573 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3574 if (ml->ifindex == mreq->mr_ifindex &&
3575 ml->type == mreq->mr_type &&
3576 ml->alen == mreq->mr_alen &&
3577 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3578 if (--ml->count == 0) {
3579 struct net_device *dev;
3581 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3583 packet_dev_mc(dev, ml, -1);
3593 static void packet_flush_mclist(struct sock *sk)
3595 struct packet_sock *po = pkt_sk(sk);
3596 struct packet_mclist *ml;
3602 while ((ml = po->mclist) != NULL) {
3603 struct net_device *dev;
3605 po->mclist = ml->next;
3606 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3608 packet_dev_mc(dev, ml, -1);
3615 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3617 struct sock *sk = sock->sk;
3618 struct packet_sock *po = pkt_sk(sk);
3621 if (level != SOL_PACKET)
3622 return -ENOPROTOOPT;
3625 case PACKET_ADD_MEMBERSHIP:
3626 case PACKET_DROP_MEMBERSHIP:
3628 struct packet_mreq_max mreq;
3630 memset(&mreq, 0, sizeof(mreq));
3631 if (len < sizeof(struct packet_mreq))
3633 if (len > sizeof(mreq))
3635 if (copy_from_user(&mreq, optval, len))
3637 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3639 if (optname == PACKET_ADD_MEMBERSHIP)
3640 ret = packet_mc_add(sk, &mreq);
3642 ret = packet_mc_drop(sk, &mreq);
3646 case PACKET_RX_RING:
3647 case PACKET_TX_RING:
3649 union tpacket_req_u req_u;
3652 switch (po->tp_version) {
3655 len = sizeof(req_u.req);
3659 len = sizeof(req_u.req3);
3664 if (copy_from_user(&req_u.req, optval, len))
3666 return packet_set_ring(sk, &req_u, 0,
3667 optname == PACKET_TX_RING);
3669 case PACKET_COPY_THRESH:
3673 if (optlen != sizeof(val))
3675 if (copy_from_user(&val, optval, sizeof(val)))
3678 pkt_sk(sk)->copy_thresh = val;
3681 case PACKET_VERSION:
3685 if (optlen != sizeof(val))
3687 if (copy_from_user(&val, optval, sizeof(val)))
3698 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3701 po->tp_version = val;
3707 case PACKET_RESERVE:
3711 if (optlen != sizeof(val))
3713 if (copy_from_user(&val, optval, sizeof(val)))
3718 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3721 po->tp_reserve = val;
3731 if (optlen != sizeof(val))
3733 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3735 if (copy_from_user(&val, optval, sizeof(val)))
3737 po->tp_loss = !!val;
3740 case PACKET_AUXDATA:
3744 if (optlen < sizeof(val))
3746 if (copy_from_user(&val, optval, sizeof(val)))
3749 po->auxdata = !!val;
3752 case PACKET_ORIGDEV:
3756 if (optlen < sizeof(val))
3758 if (copy_from_user(&val, optval, sizeof(val)))
3761 po->origdev = !!val;
3764 case PACKET_VNET_HDR:
3768 if (sock->type != SOCK_RAW)
3770 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3772 if (optlen < sizeof(val))
3774 if (copy_from_user(&val, optval, sizeof(val)))
3777 po->has_vnet_hdr = !!val;
3780 case PACKET_TIMESTAMP:
3784 if (optlen != sizeof(val))
3786 if (copy_from_user(&val, optval, sizeof(val)))
3789 po->tp_tstamp = val;
3796 if (optlen != sizeof(val))
3798 if (copy_from_user(&val, optval, sizeof(val)))
3801 return fanout_add(sk, val & 0xffff, val >> 16);
3803 case PACKET_FANOUT_DATA:
3808 return fanout_set_data(po, optval, optlen);
3810 case PACKET_TX_HAS_OFF:
3814 if (optlen != sizeof(val))
3816 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3818 if (copy_from_user(&val, optval, sizeof(val)))
3820 po->tp_tx_has_off = !!val;
3823 case PACKET_QDISC_BYPASS:
3827 if (optlen != sizeof(val))
3829 if (copy_from_user(&val, optval, sizeof(val)))
3832 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3836 return -ENOPROTOOPT;
3840 static int packet_getsockopt(struct socket *sock, int level, int optname,
3841 char __user *optval, int __user *optlen)
3844 int val, lv = sizeof(val);
3845 struct sock *sk = sock->sk;
3846 struct packet_sock *po = pkt_sk(sk);
3848 union tpacket_stats_u st;
3849 struct tpacket_rollover_stats rstats;
3851 if (level != SOL_PACKET)
3852 return -ENOPROTOOPT;
3854 if (get_user(len, optlen))
3861 case PACKET_STATISTICS:
3862 spin_lock_bh(&sk->sk_receive_queue.lock);
3863 memcpy(&st, &po->stats, sizeof(st));
3864 memset(&po->stats, 0, sizeof(po->stats));
3865 spin_unlock_bh(&sk->sk_receive_queue.lock);
3867 if (po->tp_version == TPACKET_V3) {
3868 lv = sizeof(struct tpacket_stats_v3);
3869 st.stats3.tp_packets += st.stats3.tp_drops;
3872 lv = sizeof(struct tpacket_stats);
3873 st.stats1.tp_packets += st.stats1.tp_drops;
3878 case PACKET_AUXDATA:
3881 case PACKET_ORIGDEV:
3884 case PACKET_VNET_HDR:
3885 val = po->has_vnet_hdr;
3887 case PACKET_VERSION:
3888 val = po->tp_version;
3891 if (len > sizeof(int))
3893 if (len < sizeof(int))
3895 if (copy_from_user(&val, optval, len))
3899 val = sizeof(struct tpacket_hdr);
3902 val = sizeof(struct tpacket2_hdr);
3905 val = sizeof(struct tpacket3_hdr);
3911 case PACKET_RESERVE:
3912 val = po->tp_reserve;
3917 case PACKET_TIMESTAMP:
3918 val = po->tp_tstamp;
3922 ((u32)po->fanout->id |
3923 ((u32)po->fanout->type << 16) |
3924 ((u32)po->fanout->flags << 24)) :
3927 case PACKET_ROLLOVER_STATS:
3930 rstats.tp_all = atomic_long_read(&po->rollover->num);
3931 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3932 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3934 lv = sizeof(rstats);
3936 case PACKET_TX_HAS_OFF:
3937 val = po->tp_tx_has_off;
3939 case PACKET_QDISC_BYPASS:
3940 val = packet_use_direct_xmit(po);
3943 return -ENOPROTOOPT;
3948 if (put_user(len, optlen))
3950 if (copy_to_user(optval, data, len))
3956 #ifdef CONFIG_COMPAT
3957 static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
3958 char __user *optval, unsigned int optlen)
3960 struct packet_sock *po = pkt_sk(sock->sk);
3962 if (level != SOL_PACKET)
3963 return -ENOPROTOOPT;
3965 if (optname == PACKET_FANOUT_DATA &&
3966 po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
3967 optval = (char __user *)get_compat_bpf_fprog(optval);
3970 optlen = sizeof(struct sock_fprog);
3973 return packet_setsockopt(sock, level, optname, optval, optlen);
3977 static int packet_notifier(struct notifier_block *this,
3978 unsigned long msg, void *ptr)
3981 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3982 struct net *net = dev_net(dev);
3985 sk_for_each_rcu(sk, &net->packet.sklist) {
3986 struct packet_sock *po = pkt_sk(sk);
3989 case NETDEV_UNREGISTER:
3991 packet_dev_mclist_delete(dev, &po->mclist);
3995 if (dev->ifindex == po->ifindex) {
3996 spin_lock(&po->bind_lock);
3998 __unregister_prot_hook(sk, false);
3999 sk->sk_err = ENETDOWN;
4000 if (!sock_flag(sk, SOCK_DEAD))
4001 sk->sk_error_report(sk);
4003 if (msg == NETDEV_UNREGISTER) {
4004 packet_cached_dev_reset(po);
4006 if (po->prot_hook.dev)
4007 dev_put(po->prot_hook.dev);
4008 po->prot_hook.dev = NULL;
4010 spin_unlock(&po->bind_lock);
4014 if (dev->ifindex == po->ifindex) {
4015 spin_lock(&po->bind_lock);
4017 register_prot_hook(sk);
4018 spin_unlock(&po->bind_lock);
4028 static int packet_ioctl(struct socket *sock, unsigned int cmd,
4031 struct sock *sk = sock->sk;
4036 int amount = sk_wmem_alloc_get(sk);
4038 return put_user(amount, (int __user *)arg);
4042 struct sk_buff *skb;
4045 spin_lock_bh(&sk->sk_receive_queue.lock);
4046 skb = skb_peek(&sk->sk_receive_queue);
4049 spin_unlock_bh(&sk->sk_receive_queue.lock);
4050 return put_user(amount, (int __user *)arg);
4053 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4055 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4065 case SIOCGIFBRDADDR:
4066 case SIOCSIFBRDADDR:
4067 case SIOCGIFNETMASK:
4068 case SIOCSIFNETMASK:
4069 case SIOCGIFDSTADDR:
4070 case SIOCSIFDSTADDR:
4072 return inet_dgram_ops.ioctl(sock, cmd, arg);
4076 return -ENOIOCTLCMD;
4081 static unsigned int packet_poll(struct file *file, struct socket *sock,
4084 struct sock *sk = sock->sk;
4085 struct packet_sock *po = pkt_sk(sk);
4086 unsigned int mask = datagram_poll(file, sock, wait);
4088 spin_lock_bh(&sk->sk_receive_queue.lock);
4089 if (po->rx_ring.pg_vec) {
4090 if (!packet_previous_rx_frame(po, &po->rx_ring,
4092 mask |= POLLIN | POLLRDNORM;
4094 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4096 spin_unlock_bh(&sk->sk_receive_queue.lock);
4097 spin_lock_bh(&sk->sk_write_queue.lock);
4098 if (po->tx_ring.pg_vec) {
4099 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4100 mask |= POLLOUT | POLLWRNORM;
4102 spin_unlock_bh(&sk->sk_write_queue.lock);
4107 /* Dirty? Well, I still did not learn better way to account
4111 static void packet_mm_open(struct vm_area_struct *vma)
4113 struct file *file = vma->vm_file;
4114 struct socket *sock = file->private_data;
4115 struct sock *sk = sock->sk;
4118 atomic_inc(&pkt_sk(sk)->mapped);
4121 static void packet_mm_close(struct vm_area_struct *vma)
4123 struct file *file = vma->vm_file;
4124 struct socket *sock = file->private_data;
4125 struct sock *sk = sock->sk;
4128 atomic_dec(&pkt_sk(sk)->mapped);
4131 static const struct vm_operations_struct packet_mmap_ops = {
4132 .open = packet_mm_open,
4133 .close = packet_mm_close,
4136 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4141 for (i = 0; i < len; i++) {
4142 if (likely(pg_vec[i].buffer)) {
4143 if (is_vmalloc_addr(pg_vec[i].buffer))
4144 vfree(pg_vec[i].buffer);
4146 free_pages((unsigned long)pg_vec[i].buffer,
4148 pg_vec[i].buffer = NULL;
4154 static char *alloc_one_pg_vec_page(unsigned long order)
4157 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4158 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4160 buffer = (char *) __get_free_pages(gfp_flags, order);
4164 /* __get_free_pages failed, fall back to vmalloc */
4165 buffer = vzalloc((1 << order) * PAGE_SIZE);
4169 /* vmalloc failed, lets dig into swap here */
4170 gfp_flags &= ~__GFP_NORETRY;
4171 buffer = (char *) __get_free_pages(gfp_flags, order);
4175 /* complete and utter failure */
4179 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4181 unsigned int block_nr = req->tp_block_nr;
4185 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4186 if (unlikely(!pg_vec))
4189 for (i = 0; i < block_nr; i++) {
4190 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4191 if (unlikely(!pg_vec[i].buffer))
4192 goto out_free_pgvec;
4199 free_pg_vec(pg_vec, order, block_nr);
4204 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4205 int closing, int tx_ring)
4207 struct pgv *pg_vec = NULL;
4208 struct packet_sock *po = pkt_sk(sk);
4209 int was_running, order = 0;
4210 struct packet_ring_buffer *rb;
4211 struct sk_buff_head *rb_queue;
4214 /* Added to avoid minimal code churn */
4215 struct tpacket_req *req = &req_u->req;
4219 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4220 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4224 if (atomic_read(&po->mapped))
4226 if (packet_read_pending(rb))
4230 if (req->tp_block_nr) {
4231 /* Sanity tests and some calculations */
4233 if (unlikely(rb->pg_vec))
4236 switch (po->tp_version) {
4238 po->tp_hdrlen = TPACKET_HDRLEN;
4241 po->tp_hdrlen = TPACKET2_HDRLEN;
4244 po->tp_hdrlen = TPACKET3_HDRLEN;
4249 if (unlikely((int)req->tp_block_size <= 0))
4251 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4253 if (po->tp_version >= TPACKET_V3 &&
4254 req->tp_block_size <=
4255 BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv))
4257 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
4260 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4263 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4264 if (unlikely(rb->frames_per_block == 0))
4266 if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr))
4268 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4273 order = get_order(req->tp_block_size);
4274 pg_vec = alloc_pg_vec(req, order);
4275 if (unlikely(!pg_vec))
4277 switch (po->tp_version) {
4279 /* Block transmit is not supported yet */
4281 init_prb_bdqc(po, rb, pg_vec, req_u);
4283 struct tpacket_req3 *req3 = &req_u->req3;
4285 if (req3->tp_retire_blk_tov ||
4286 req3->tp_sizeof_priv ||
4287 req3->tp_feature_req_word) {
4300 if (unlikely(req->tp_frame_nr))
4305 /* Detach socket from network */
4306 spin_lock(&po->bind_lock);
4307 was_running = po->running;
4311 __unregister_prot_hook(sk, false);
4313 spin_unlock(&po->bind_lock);
4318 mutex_lock(&po->pg_vec_lock);
4319 if (closing || atomic_read(&po->mapped) == 0) {
4321 spin_lock_bh(&rb_queue->lock);
4322 swap(rb->pg_vec, pg_vec);
4323 rb->frame_max = (req->tp_frame_nr - 1);
4325 rb->frame_size = req->tp_frame_size;
4326 spin_unlock_bh(&rb_queue->lock);
4328 swap(rb->pg_vec_order, order);
4329 swap(rb->pg_vec_len, req->tp_block_nr);
4331 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4332 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4333 tpacket_rcv : packet_rcv;
4334 skb_queue_purge(rb_queue);
4335 if (atomic_read(&po->mapped))
4336 pr_err("packet_mmap: vma is busy: %d\n",
4337 atomic_read(&po->mapped));
4339 mutex_unlock(&po->pg_vec_lock);
4341 spin_lock(&po->bind_lock);
4344 register_prot_hook(sk);
4346 spin_unlock(&po->bind_lock);
4347 if (pg_vec && (po->tp_version > TPACKET_V2)) {
4348 /* Because we don't support block-based V3 on tx-ring */
4350 prb_shutdown_retire_blk_timer(po, rb_queue);
4354 free_pg_vec(pg_vec, order, req->tp_block_nr);
4360 static int packet_mmap(struct file *file, struct socket *sock,
4361 struct vm_area_struct *vma)
4363 struct sock *sk = sock->sk;
4364 struct packet_sock *po = pkt_sk(sk);
4365 unsigned long size, expected_size;
4366 struct packet_ring_buffer *rb;
4367 unsigned long start;
4374 mutex_lock(&po->pg_vec_lock);
4377 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4379 expected_size += rb->pg_vec_len
4385 if (expected_size == 0)
4388 size = vma->vm_end - vma->vm_start;
4389 if (size != expected_size)
4392 start = vma->vm_start;
4393 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4394 if (rb->pg_vec == NULL)
4397 for (i = 0; i < rb->pg_vec_len; i++) {
4399 void *kaddr = rb->pg_vec[i].buffer;
4402 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4403 page = pgv_to_page(kaddr);
4404 err = vm_insert_page(vma, start, page);
4413 atomic_inc(&po->mapped);
4414 vma->vm_ops = &packet_mmap_ops;
4418 mutex_unlock(&po->pg_vec_lock);
4422 static const struct proto_ops packet_ops_spkt = {
4423 .family = PF_PACKET,
4424 .owner = THIS_MODULE,
4425 .release = packet_release,
4426 .bind = packet_bind_spkt,
4427 .connect = sock_no_connect,
4428 .socketpair = sock_no_socketpair,
4429 .accept = sock_no_accept,
4430 .getname = packet_getname_spkt,
4431 .poll = datagram_poll,
4432 .ioctl = packet_ioctl,
4433 .listen = sock_no_listen,
4434 .shutdown = sock_no_shutdown,
4435 .setsockopt = sock_no_setsockopt,
4436 .getsockopt = sock_no_getsockopt,
4437 .sendmsg = packet_sendmsg_spkt,
4438 .recvmsg = packet_recvmsg,
4439 .mmap = sock_no_mmap,
4440 .sendpage = sock_no_sendpage,
4443 static const struct proto_ops packet_ops = {
4444 .family = PF_PACKET,
4445 .owner = THIS_MODULE,
4446 .release = packet_release,
4447 .bind = packet_bind,
4448 .connect = sock_no_connect,
4449 .socketpair = sock_no_socketpair,
4450 .accept = sock_no_accept,
4451 .getname = packet_getname,
4452 .poll = packet_poll,
4453 .ioctl = packet_ioctl,
4454 .listen = sock_no_listen,
4455 .shutdown = sock_no_shutdown,
4456 .setsockopt = packet_setsockopt,
4457 .getsockopt = packet_getsockopt,
4458 #ifdef CONFIG_COMPAT
4459 .compat_setsockopt = compat_packet_setsockopt,
4461 .sendmsg = packet_sendmsg,
4462 .recvmsg = packet_recvmsg,
4463 .mmap = packet_mmap,
4464 .sendpage = sock_no_sendpage,
4467 static const struct net_proto_family packet_family_ops = {
4468 .family = PF_PACKET,
4469 .create = packet_create,
4470 .owner = THIS_MODULE,
4473 static struct notifier_block packet_netdev_notifier = {
4474 .notifier_call = packet_notifier,
4477 #ifdef CONFIG_PROC_FS
4479 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4482 struct net *net = seq_file_net(seq);
4485 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4488 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4490 struct net *net = seq_file_net(seq);
4491 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4494 static void packet_seq_stop(struct seq_file *seq, void *v)
4500 static int packet_seq_show(struct seq_file *seq, void *v)
4502 if (v == SEQ_START_TOKEN)
4503 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4505 struct sock *s = sk_entry(v);
4506 const struct packet_sock *po = pkt_sk(s);
4509 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4511 refcount_read(&s->sk_refcnt),
4516 atomic_read(&s->sk_rmem_alloc),
4517 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4524 static const struct seq_operations packet_seq_ops = {
4525 .start = packet_seq_start,
4526 .next = packet_seq_next,
4527 .stop = packet_seq_stop,
4528 .show = packet_seq_show,
4531 static int packet_seq_open(struct inode *inode, struct file *file)
4533 return seq_open_net(inode, file, &packet_seq_ops,
4534 sizeof(struct seq_net_private));
4537 static const struct file_operations packet_seq_fops = {
4538 .owner = THIS_MODULE,
4539 .open = packet_seq_open,
4541 .llseek = seq_lseek,
4542 .release = seq_release_net,
4547 static int __net_init packet_net_init(struct net *net)
4549 mutex_init(&net->packet.sklist_lock);
4550 INIT_HLIST_HEAD(&net->packet.sklist);
4552 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4558 static void __net_exit packet_net_exit(struct net *net)
4560 remove_proc_entry("packet", net->proc_net);
4563 static struct pernet_operations packet_net_ops = {
4564 .init = packet_net_init,
4565 .exit = packet_net_exit,
4569 static void __exit packet_exit(void)
4571 unregister_netdevice_notifier(&packet_netdev_notifier);
4572 unregister_pernet_subsys(&packet_net_ops);
4573 sock_unregister(PF_PACKET);
4574 proto_unregister(&packet_proto);
4577 static int __init packet_init(void)
4579 int rc = proto_register(&packet_proto, 0);
4584 sock_register(&packet_family_ops);
4585 register_pernet_subsys(&packet_net_ops);
4586 register_netdevice_notifier(&packet_netdev_notifier);
4591 module_init(packet_init);
4592 module_exit(packet_exit);
4593 MODULE_LICENSE("GPL");
4594 MODULE_ALIAS_NETPROTO(PF_PACKET);