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);
1695 if (type == PACKET_FANOUT_ROLLOVER ||
1696 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1698 rollover = kzalloc(sizeof(*rollover), GFP_KERNEL);
1701 atomic_long_set(&rollover->num, 0);
1702 atomic_long_set(&rollover->num_huge, 0);
1703 atomic_long_set(&rollover->num_failed, 0);
1704 po->rollover = rollover;
1707 if (type_flags & PACKET_FANOUT_FLAG_UNIQUEID) {
1712 if (!fanout_find_new_id(sk, &id)) {
1716 /* ephemeral flag for the first socket in the group: drop it */
1717 flags &= ~(PACKET_FANOUT_FLAG_UNIQUEID >> 8);
1721 list_for_each_entry(f, &fanout_list, list) {
1723 read_pnet(&f->net) == sock_net(sk)) {
1729 if (match && match->flags != flags)
1733 match = kzalloc(sizeof(*match), GFP_KERNEL);
1736 write_pnet(&match->net, sock_net(sk));
1739 match->flags = flags;
1740 INIT_LIST_HEAD(&match->list);
1741 spin_lock_init(&match->lock);
1742 refcount_set(&match->sk_ref, 0);
1743 fanout_init_data(match);
1744 match->prot_hook.type = po->prot_hook.type;
1745 match->prot_hook.dev = po->prot_hook.dev;
1746 match->prot_hook.func = packet_rcv_fanout;
1747 match->prot_hook.af_packet_priv = match;
1748 match->prot_hook.id_match = match_fanout_group;
1749 list_add(&match->list, &fanout_list);
1752 if (match->type == type &&
1753 match->prot_hook.type == po->prot_hook.type &&
1754 match->prot_hook.dev == po->prot_hook.dev) {
1756 if (refcount_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1757 __dev_remove_pack(&po->prot_hook);
1759 refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1);
1760 __fanout_link(sk, po);
1765 if (err && rollover) {
1767 po->rollover = NULL;
1769 mutex_unlock(&fanout_mutex);
1773 /* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes
1774 * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout.
1775 * It is the responsibility of the caller to call fanout_release_data() and
1776 * free the returned packet_fanout (after synchronize_net())
1778 static struct packet_fanout *fanout_release(struct sock *sk)
1780 struct packet_sock *po = pkt_sk(sk);
1781 struct packet_fanout *f;
1783 mutex_lock(&fanout_mutex);
1788 if (refcount_dec_and_test(&f->sk_ref))
1794 kfree_rcu(po->rollover, rcu);
1796 mutex_unlock(&fanout_mutex);
1801 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1802 struct sk_buff *skb)
1804 /* Earlier code assumed this would be a VLAN pkt, double-check
1805 * this now that we have the actual packet in hand. We can only
1806 * do this check on Ethernet devices.
1808 if (unlikely(dev->type != ARPHRD_ETHER))
1811 skb_reset_mac_header(skb);
1812 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1815 static const struct proto_ops packet_ops;
1817 static const struct proto_ops packet_ops_spkt;
1819 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1820 struct packet_type *pt, struct net_device *orig_dev)
1823 struct sockaddr_pkt *spkt;
1826 * When we registered the protocol we saved the socket in the data
1827 * field for just this event.
1830 sk = pt->af_packet_priv;
1833 * Yank back the headers [hope the device set this
1834 * right or kerboom...]
1836 * Incoming packets have ll header pulled,
1839 * For outgoing ones skb->data == skb_mac_header(skb)
1840 * so that this procedure is noop.
1843 if (skb->pkt_type == PACKET_LOOPBACK)
1846 if (!net_eq(dev_net(dev), sock_net(sk)))
1849 skb = skb_share_check(skb, GFP_ATOMIC);
1853 /* drop any routing info */
1856 /* drop conntrack reference */
1859 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1861 skb_push(skb, skb->data - skb_mac_header(skb));
1864 * The SOCK_PACKET socket receives _all_ frames.
1867 spkt->spkt_family = dev->type;
1868 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1869 spkt->spkt_protocol = skb->protocol;
1872 * Charge the memory to the socket. This is done specifically
1873 * to prevent sockets using all the memory up.
1876 if (sock_queue_rcv_skb(sk, skb) == 0)
1887 * Output a raw packet to a device layer. This bypasses all the other
1888 * protocol layers and you must therefore supply it with a complete frame
1891 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1894 struct sock *sk = sock->sk;
1895 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1896 struct sk_buff *skb = NULL;
1897 struct net_device *dev;
1898 struct sockcm_cookie sockc;
1904 * Get and verify the address.
1908 if (msg->msg_namelen < sizeof(struct sockaddr))
1910 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1911 proto = saddr->spkt_protocol;
1913 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1916 * Find the device first to size check it
1919 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1922 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1928 if (!(dev->flags & IFF_UP))
1932 * You may not queue a frame bigger than the mtu. This is the lowest level
1933 * raw protocol and you must do your own fragmentation at this level.
1936 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1937 if (!netif_supports_nofcs(dev)) {
1938 err = -EPROTONOSUPPORT;
1941 extra_len = 4; /* We're doing our own CRC */
1945 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1949 size_t reserved = LL_RESERVED_SPACE(dev);
1950 int tlen = dev->needed_tailroom;
1951 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1954 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1957 /* FIXME: Save some space for broken drivers that write a hard
1958 * header at transmission time by themselves. PPP is the notable
1959 * one here. This should really be fixed at the driver level.
1961 skb_reserve(skb, reserved);
1962 skb_reset_network_header(skb);
1964 /* Try to align data part correctly */
1969 skb_reset_network_header(skb);
1971 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1977 if (!dev_validate_header(dev, skb->data, len)) {
1981 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1982 !packet_extra_vlan_len_allowed(dev, skb)) {
1987 sockc.tsflags = sk->sk_tsflags;
1988 if (msg->msg_controllen) {
1989 err = sock_cmsg_send(sk, msg, &sockc);
1994 skb->protocol = proto;
1996 skb->priority = sk->sk_priority;
1997 skb->mark = sk->sk_mark;
1999 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2001 if (unlikely(extra_len == 4))
2004 skb_probe_transport_header(skb, 0);
2006 dev_queue_xmit(skb);
2017 static unsigned int run_filter(struct sk_buff *skb,
2018 const struct sock *sk,
2021 struct sk_filter *filter;
2024 filter = rcu_dereference(sk->sk_filter);
2026 res = bpf_prog_run_clear_cb(filter->prog, skb);
2032 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
2035 struct virtio_net_hdr vnet_hdr;
2037 if (*len < sizeof(vnet_hdr))
2039 *len -= sizeof(vnet_hdr);
2041 if (virtio_net_hdr_from_skb(skb, &vnet_hdr, vio_le(), true))
2044 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
2048 * This function makes lazy skb cloning in hope that most of packets
2049 * are discarded by BPF.
2051 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2052 * and skb->cb are mangled. It works because (and until) packets
2053 * falling here are owned by current CPU. Output packets are cloned
2054 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2055 * sequencially, so that if we return skb to original state on exit,
2056 * we will not harm anyone.
2059 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2060 struct packet_type *pt, struct net_device *orig_dev)
2063 struct sockaddr_ll *sll;
2064 struct packet_sock *po;
2065 u8 *skb_head = skb->data;
2066 int skb_len = skb->len;
2067 unsigned int snaplen, res;
2068 bool is_drop_n_account = false;
2070 if (skb->pkt_type == PACKET_LOOPBACK)
2073 sk = pt->af_packet_priv;
2076 if (!net_eq(dev_net(dev), sock_net(sk)))
2081 if (dev->header_ops) {
2082 /* The device has an explicit notion of ll header,
2083 * exported to higher levels.
2085 * Otherwise, the device hides details of its frame
2086 * structure, so that corresponding packet head is
2087 * never delivered to user.
2089 if (sk->sk_type != SOCK_DGRAM)
2090 skb_push(skb, skb->data - skb_mac_header(skb));
2091 else if (skb->pkt_type == PACKET_OUTGOING) {
2092 /* Special case: outgoing packets have ll header at head */
2093 skb_pull(skb, skb_network_offset(skb));
2099 res = run_filter(skb, sk, snaplen);
2101 goto drop_n_restore;
2105 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2108 if (skb_shared(skb)) {
2109 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2113 if (skb_head != skb->data) {
2114 skb->data = skb_head;
2121 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2123 sll = &PACKET_SKB_CB(skb)->sa.ll;
2124 sll->sll_hatype = dev->type;
2125 sll->sll_pkttype = skb->pkt_type;
2126 if (unlikely(po->origdev))
2127 sll->sll_ifindex = orig_dev->ifindex;
2129 sll->sll_ifindex = dev->ifindex;
2131 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2133 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2134 * Use their space for storing the original skb length.
2136 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2138 if (pskb_trim(skb, snaplen))
2141 skb_set_owner_r(skb, sk);
2145 /* drop conntrack reference */
2148 spin_lock(&sk->sk_receive_queue.lock);
2149 po->stats.stats1.tp_packets++;
2150 sock_skb_set_dropcount(sk, skb);
2151 __skb_queue_tail(&sk->sk_receive_queue, skb);
2152 spin_unlock(&sk->sk_receive_queue.lock);
2153 sk->sk_data_ready(sk);
2157 is_drop_n_account = true;
2158 spin_lock(&sk->sk_receive_queue.lock);
2159 po->stats.stats1.tp_drops++;
2160 atomic_inc(&sk->sk_drops);
2161 spin_unlock(&sk->sk_receive_queue.lock);
2164 if (skb_head != skb->data && skb_shared(skb)) {
2165 skb->data = skb_head;
2169 if (!is_drop_n_account)
2176 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2177 struct packet_type *pt, struct net_device *orig_dev)
2180 struct packet_sock *po;
2181 struct sockaddr_ll *sll;
2182 union tpacket_uhdr h;
2183 u8 *skb_head = skb->data;
2184 int skb_len = skb->len;
2185 unsigned int snaplen, res;
2186 unsigned long status = TP_STATUS_USER;
2187 unsigned short macoff, netoff, hdrlen;
2188 struct sk_buff *copy_skb = NULL;
2191 bool is_drop_n_account = false;
2193 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2194 * We may add members to them until current aligned size without forcing
2195 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2197 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2198 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2200 if (skb->pkt_type == PACKET_LOOPBACK)
2203 sk = pt->af_packet_priv;
2206 if (!net_eq(dev_net(dev), sock_net(sk)))
2209 if (dev->header_ops) {
2210 if (sk->sk_type != SOCK_DGRAM)
2211 skb_push(skb, skb->data - skb_mac_header(skb));
2212 else if (skb->pkt_type == PACKET_OUTGOING) {
2213 /* Special case: outgoing packets have ll header at head */
2214 skb_pull(skb, skb_network_offset(skb));
2220 res = run_filter(skb, sk, snaplen);
2222 goto drop_n_restore;
2224 if (skb->ip_summed == CHECKSUM_PARTIAL)
2225 status |= TP_STATUS_CSUMNOTREADY;
2226 else if (skb->pkt_type != PACKET_OUTGOING &&
2227 (skb->ip_summed == CHECKSUM_COMPLETE ||
2228 skb_csum_unnecessary(skb)))
2229 status |= TP_STATUS_CSUM_VALID;
2234 if (sk->sk_type == SOCK_DGRAM) {
2235 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2238 unsigned int maclen = skb_network_offset(skb);
2239 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2240 (maclen < 16 ? 16 : maclen)) +
2242 if (po->has_vnet_hdr)
2243 netoff += sizeof(struct virtio_net_hdr);
2244 macoff = netoff - maclen;
2246 if (po->tp_version <= TPACKET_V2) {
2247 if (macoff + snaplen > po->rx_ring.frame_size) {
2248 if (po->copy_thresh &&
2249 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2250 if (skb_shared(skb)) {
2251 copy_skb = skb_clone(skb, GFP_ATOMIC);
2253 copy_skb = skb_get(skb);
2254 skb_head = skb->data;
2257 skb_set_owner_r(copy_skb, sk);
2259 snaplen = po->rx_ring.frame_size - macoff;
2260 if ((int)snaplen < 0)
2263 } else if (unlikely(macoff + snaplen >
2264 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2267 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2268 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2269 snaplen, nval, macoff);
2271 if (unlikely((int)snaplen < 0)) {
2273 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2276 spin_lock(&sk->sk_receive_queue.lock);
2277 h.raw = packet_current_rx_frame(po, skb,
2278 TP_STATUS_KERNEL, (macoff+snaplen));
2280 goto drop_n_account;
2281 if (po->tp_version <= TPACKET_V2) {
2282 packet_increment_rx_head(po, &po->rx_ring);
2284 * LOSING will be reported till you read the stats,
2285 * because it's COR - Clear On Read.
2286 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2289 if (po->stats.stats1.tp_drops)
2290 status |= TP_STATUS_LOSING;
2292 po->stats.stats1.tp_packets++;
2294 status |= TP_STATUS_COPY;
2295 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2297 spin_unlock(&sk->sk_receive_queue.lock);
2299 if (po->has_vnet_hdr) {
2300 if (virtio_net_hdr_from_skb(skb, h.raw + macoff -
2301 sizeof(struct virtio_net_hdr),
2303 spin_lock(&sk->sk_receive_queue.lock);
2304 goto drop_n_account;
2308 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2310 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2311 getnstimeofday(&ts);
2313 status |= ts_status;
2315 switch (po->tp_version) {
2317 h.h1->tp_len = skb->len;
2318 h.h1->tp_snaplen = snaplen;
2319 h.h1->tp_mac = macoff;
2320 h.h1->tp_net = netoff;
2321 h.h1->tp_sec = ts.tv_sec;
2322 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2323 hdrlen = sizeof(*h.h1);
2326 h.h2->tp_len = skb->len;
2327 h.h2->tp_snaplen = snaplen;
2328 h.h2->tp_mac = macoff;
2329 h.h2->tp_net = netoff;
2330 h.h2->tp_sec = ts.tv_sec;
2331 h.h2->tp_nsec = ts.tv_nsec;
2332 if (skb_vlan_tag_present(skb)) {
2333 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2334 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2335 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2337 h.h2->tp_vlan_tci = 0;
2338 h.h2->tp_vlan_tpid = 0;
2340 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2341 hdrlen = sizeof(*h.h2);
2344 /* tp_nxt_offset,vlan are already populated above.
2345 * So DONT clear those fields here
2347 h.h3->tp_status |= status;
2348 h.h3->tp_len = skb->len;
2349 h.h3->tp_snaplen = snaplen;
2350 h.h3->tp_mac = macoff;
2351 h.h3->tp_net = netoff;
2352 h.h3->tp_sec = ts.tv_sec;
2353 h.h3->tp_nsec = ts.tv_nsec;
2354 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2355 hdrlen = sizeof(*h.h3);
2361 sll = h.raw + TPACKET_ALIGN(hdrlen);
2362 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2363 sll->sll_family = AF_PACKET;
2364 sll->sll_hatype = dev->type;
2365 sll->sll_protocol = skb->protocol;
2366 sll->sll_pkttype = skb->pkt_type;
2367 if (unlikely(po->origdev))
2368 sll->sll_ifindex = orig_dev->ifindex;
2370 sll->sll_ifindex = dev->ifindex;
2374 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2375 if (po->tp_version <= TPACKET_V2) {
2378 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2381 for (start = h.raw; start < end; start += PAGE_SIZE)
2382 flush_dcache_page(pgv_to_page(start));
2387 if (po->tp_version <= TPACKET_V2) {
2388 __packet_set_status(po, h.raw, status);
2389 sk->sk_data_ready(sk);
2391 prb_clear_blk_fill_status(&po->rx_ring);
2395 if (skb_head != skb->data && skb_shared(skb)) {
2396 skb->data = skb_head;
2400 if (!is_drop_n_account)
2407 is_drop_n_account = true;
2408 po->stats.stats1.tp_drops++;
2409 spin_unlock(&sk->sk_receive_queue.lock);
2411 sk->sk_data_ready(sk);
2412 kfree_skb(copy_skb);
2413 goto drop_n_restore;
2416 static void tpacket_destruct_skb(struct sk_buff *skb)
2418 struct packet_sock *po = pkt_sk(skb->sk);
2420 if (likely(po->tx_ring.pg_vec)) {
2424 ph = skb_shinfo(skb)->destructor_arg;
2425 packet_dec_pending(&po->tx_ring);
2427 ts = __packet_set_timestamp(po, ph, skb);
2428 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2434 static void tpacket_set_protocol(const struct net_device *dev,
2435 struct sk_buff *skb)
2437 if (dev->type == ARPHRD_ETHER) {
2438 skb_reset_mac_header(skb);
2439 skb->protocol = eth_hdr(skb)->h_proto;
2443 static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2445 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2446 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2447 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2448 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2449 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2450 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2451 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2453 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2459 static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2460 struct virtio_net_hdr *vnet_hdr)
2462 if (*len < sizeof(*vnet_hdr))
2464 *len -= sizeof(*vnet_hdr);
2466 if (!copy_from_iter_full(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter))
2469 return __packet_snd_vnet_parse(vnet_hdr, *len);
2472 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2473 void *frame, struct net_device *dev, void *data, int tp_len,
2474 __be16 proto, unsigned char *addr, int hlen, int copylen,
2475 const struct sockcm_cookie *sockc)
2477 union tpacket_uhdr ph;
2478 int to_write, offset, len, nr_frags, len_max;
2479 struct socket *sock = po->sk.sk_socket;
2485 skb->protocol = proto;
2487 skb->priority = po->sk.sk_priority;
2488 skb->mark = po->sk.sk_mark;
2489 sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
2490 skb_shinfo(skb)->destructor_arg = ph.raw;
2492 skb_reserve(skb, hlen);
2493 skb_reset_network_header(skb);
2497 if (sock->type == SOCK_DGRAM) {
2498 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2500 if (unlikely(err < 0))
2502 } else if (copylen) {
2503 int hdrlen = min_t(int, copylen, tp_len);
2505 skb_push(skb, dev->hard_header_len);
2506 skb_put(skb, copylen - dev->hard_header_len);
2507 err = skb_store_bits(skb, 0, data, hdrlen);
2510 if (!dev_validate_header(dev, skb->data, hdrlen))
2513 tpacket_set_protocol(dev, skb);
2519 offset = offset_in_page(data);
2520 len_max = PAGE_SIZE - offset;
2521 len = ((to_write > len_max) ? len_max : to_write);
2523 skb->data_len = to_write;
2524 skb->len += to_write;
2525 skb->truesize += to_write;
2526 refcount_add(to_write, &po->sk.sk_wmem_alloc);
2528 while (likely(to_write)) {
2529 nr_frags = skb_shinfo(skb)->nr_frags;
2531 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2532 pr_err("Packet exceed the number of skb frags(%lu)\n",
2537 page = pgv_to_page(data);
2539 flush_dcache_page(page);
2541 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2544 len_max = PAGE_SIZE;
2545 len = ((to_write > len_max) ? len_max : to_write);
2548 skb_probe_transport_header(skb, 0);
2553 static int tpacket_parse_header(struct packet_sock *po, void *frame,
2554 int size_max, void **data)
2556 union tpacket_uhdr ph;
2561 switch (po->tp_version) {
2563 if (ph.h3->tp_next_offset != 0) {
2564 pr_warn_once("variable sized slot not supported");
2567 tp_len = ph.h3->tp_len;
2570 tp_len = ph.h2->tp_len;
2573 tp_len = ph.h1->tp_len;
2576 if (unlikely(tp_len > size_max)) {
2577 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2581 if (unlikely(po->tp_tx_has_off)) {
2582 int off_min, off_max;
2584 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2585 off_max = po->tx_ring.frame_size - tp_len;
2586 if (po->sk.sk_type == SOCK_DGRAM) {
2587 switch (po->tp_version) {
2589 off = ph.h3->tp_net;
2592 off = ph.h2->tp_net;
2595 off = ph.h1->tp_net;
2599 switch (po->tp_version) {
2601 off = ph.h3->tp_mac;
2604 off = ph.h2->tp_mac;
2607 off = ph.h1->tp_mac;
2611 if (unlikely((off < off_min) || (off_max < off)))
2614 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2617 *data = frame + off;
2621 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2623 struct sk_buff *skb;
2624 struct net_device *dev;
2625 struct virtio_net_hdr *vnet_hdr = NULL;
2626 struct sockcm_cookie sockc;
2628 int err, reserve = 0;
2630 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2631 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2632 int tp_len, size_max;
2633 unsigned char *addr;
2636 int status = TP_STATUS_AVAILABLE;
2637 int hlen, tlen, copylen = 0;
2639 mutex_lock(&po->pg_vec_lock);
2641 if (likely(saddr == NULL)) {
2642 dev = packet_cached_dev_get(po);
2647 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2649 if (msg->msg_namelen < (saddr->sll_halen
2650 + offsetof(struct sockaddr_ll,
2653 proto = saddr->sll_protocol;
2654 addr = saddr->sll_addr;
2655 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2659 if (unlikely(dev == NULL))
2662 if (unlikely(!(dev->flags & IFF_UP)))
2665 sockc.tsflags = po->sk.sk_tsflags;
2666 if (msg->msg_controllen) {
2667 err = sock_cmsg_send(&po->sk, msg, &sockc);
2672 if (po->sk.sk_socket->type == SOCK_RAW)
2673 reserve = dev->hard_header_len;
2674 size_max = po->tx_ring.frame_size
2675 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2677 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
2678 size_max = dev->mtu + reserve + VLAN_HLEN;
2681 ph = packet_current_frame(po, &po->tx_ring,
2682 TP_STATUS_SEND_REQUEST);
2683 if (unlikely(ph == NULL)) {
2684 if (need_wait && need_resched())
2690 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2694 status = TP_STATUS_SEND_REQUEST;
2695 hlen = LL_RESERVED_SPACE(dev);
2696 tlen = dev->needed_tailroom;
2697 if (po->has_vnet_hdr) {
2699 data += sizeof(*vnet_hdr);
2700 tp_len -= sizeof(*vnet_hdr);
2702 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2706 copylen = __virtio16_to_cpu(vio_le(),
2709 copylen = max_t(int, copylen, dev->hard_header_len);
2710 skb = sock_alloc_send_skb(&po->sk,
2711 hlen + tlen + sizeof(struct sockaddr_ll) +
2712 (copylen - dev->hard_header_len),
2715 if (unlikely(skb == NULL)) {
2716 /* we assume the socket was initially writeable ... */
2717 if (likely(len_sum > 0))
2721 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
2722 addr, hlen, copylen, &sockc);
2723 if (likely(tp_len >= 0) &&
2724 tp_len > dev->mtu + reserve &&
2725 !po->has_vnet_hdr &&
2726 !packet_extra_vlan_len_allowed(dev, skb))
2729 if (unlikely(tp_len < 0)) {
2732 __packet_set_status(po, ph,
2733 TP_STATUS_AVAILABLE);
2734 packet_increment_head(&po->tx_ring);
2738 status = TP_STATUS_WRONG_FORMAT;
2744 if (po->has_vnet_hdr && virtio_net_hdr_to_skb(skb, vnet_hdr,
2750 skb->destructor = tpacket_destruct_skb;
2751 __packet_set_status(po, ph, TP_STATUS_SENDING);
2752 packet_inc_pending(&po->tx_ring);
2754 status = TP_STATUS_SEND_REQUEST;
2755 err = po->xmit(skb);
2756 if (unlikely(err > 0)) {
2757 err = net_xmit_errno(err);
2758 if (err && __packet_get_status(po, ph) ==
2759 TP_STATUS_AVAILABLE) {
2760 /* skb was destructed already */
2765 * skb was dropped but not destructed yet;
2766 * let's treat it like congestion or err < 0
2770 packet_increment_head(&po->tx_ring);
2772 } while (likely((ph != NULL) ||
2773 /* Note: packet_read_pending() might be slow if we have
2774 * to call it as it's per_cpu variable, but in fast-path
2775 * we already short-circuit the loop with the first
2776 * condition, and luckily don't have to go that path
2779 (need_wait && packet_read_pending(&po->tx_ring))));
2785 __packet_set_status(po, ph, status);
2790 mutex_unlock(&po->pg_vec_lock);
2794 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2795 size_t reserve, size_t len,
2796 size_t linear, int noblock,
2799 struct sk_buff *skb;
2801 /* Under a page? Don't bother with paged skb. */
2802 if (prepad + len < PAGE_SIZE || !linear)
2805 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2810 skb_reserve(skb, reserve);
2811 skb_put(skb, linear);
2812 skb->data_len = len - linear;
2813 skb->len += len - linear;
2818 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2820 struct sock *sk = sock->sk;
2821 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2822 struct sk_buff *skb;
2823 struct net_device *dev;
2825 unsigned char *addr;
2826 int err, reserve = 0;
2827 struct sockcm_cookie sockc;
2828 struct virtio_net_hdr vnet_hdr = { 0 };
2830 struct packet_sock *po = pkt_sk(sk);
2831 int hlen, tlen, linear;
2835 * Get and verify the address.
2838 if (likely(saddr == NULL)) {
2839 dev = packet_cached_dev_get(po);
2844 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2846 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2848 proto = saddr->sll_protocol;
2849 addr = saddr->sll_addr;
2850 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2854 if (unlikely(dev == NULL))
2857 if (unlikely(!(dev->flags & IFF_UP)))
2860 sockc.tsflags = sk->sk_tsflags;
2861 sockc.mark = sk->sk_mark;
2862 if (msg->msg_controllen) {
2863 err = sock_cmsg_send(sk, msg, &sockc);
2868 if (sock->type == SOCK_RAW)
2869 reserve = dev->hard_header_len;
2870 if (po->has_vnet_hdr) {
2871 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2876 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2877 if (!netif_supports_nofcs(dev)) {
2878 err = -EPROTONOSUPPORT;
2881 extra_len = 4; /* We're doing our own CRC */
2885 if (!vnet_hdr.gso_type &&
2886 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2890 hlen = LL_RESERVED_SPACE(dev);
2891 tlen = dev->needed_tailroom;
2892 linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len);
2893 linear = max(linear, min_t(int, len, dev->hard_header_len));
2894 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear,
2895 msg->msg_flags & MSG_DONTWAIT, &err);
2899 skb_set_network_header(skb, reserve);
2902 if (sock->type == SOCK_DGRAM) {
2903 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2904 if (unlikely(offset < 0))
2908 /* Returns -EFAULT on error */
2909 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2913 if (sock->type == SOCK_RAW &&
2914 !dev_validate_header(dev, skb->data, len)) {
2919 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2921 if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
2922 !packet_extra_vlan_len_allowed(dev, skb)) {
2927 skb->protocol = proto;
2929 skb->priority = sk->sk_priority;
2930 skb->mark = sockc.mark;
2932 if (po->has_vnet_hdr) {
2933 err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le());
2936 len += sizeof(vnet_hdr);
2939 skb_probe_transport_header(skb, reserve);
2941 if (unlikely(extra_len == 4))
2944 err = po->xmit(skb);
2945 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2961 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2963 struct sock *sk = sock->sk;
2964 struct packet_sock *po = pkt_sk(sk);
2966 if (po->tx_ring.pg_vec)
2967 return tpacket_snd(po, msg);
2969 return packet_snd(sock, msg, len);
2973 * Close a PACKET socket. This is fairly simple. We immediately go
2974 * to 'closed' state and remove our protocol entry in the device list.
2977 static int packet_release(struct socket *sock)
2979 struct sock *sk = sock->sk;
2980 struct packet_sock *po;
2981 struct packet_fanout *f;
2983 union tpacket_req_u req_u;
2991 mutex_lock(&net->packet.sklist_lock);
2992 sk_del_node_init_rcu(sk);
2993 mutex_unlock(&net->packet.sklist_lock);
2996 sock_prot_inuse_add(net, sk->sk_prot, -1);
2999 spin_lock(&po->bind_lock);
3000 unregister_prot_hook(sk, false);
3001 packet_cached_dev_reset(po);
3003 if (po->prot_hook.dev) {
3004 dev_put(po->prot_hook.dev);
3005 po->prot_hook.dev = NULL;
3007 spin_unlock(&po->bind_lock);
3009 packet_flush_mclist(sk);
3011 if (po->rx_ring.pg_vec) {
3012 memset(&req_u, 0, sizeof(req_u));
3013 packet_set_ring(sk, &req_u, 1, 0);
3016 if (po->tx_ring.pg_vec) {
3017 memset(&req_u, 0, sizeof(req_u));
3018 packet_set_ring(sk, &req_u, 1, 1);
3021 f = fanout_release(sk);
3026 fanout_release_data(f);
3030 * Now the socket is dead. No more input will appear.
3037 skb_queue_purge(&sk->sk_receive_queue);
3038 packet_free_pending(po);
3039 sk_refcnt_debug_release(sk);
3046 * Attach a packet hook.
3049 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3052 struct packet_sock *po = pkt_sk(sk);
3053 struct net_device *dev_curr;
3056 struct net_device *dev = NULL;
3058 bool unlisted = false;
3064 spin_lock(&po->bind_lock);
3068 dev = dev_get_by_name_rcu(sock_net(sk), name);
3073 } else if (ifindex) {
3074 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3084 proto_curr = po->prot_hook.type;
3085 dev_curr = po->prot_hook.dev;
3087 need_rehook = proto_curr != proto || dev_curr != dev;
3092 __unregister_prot_hook(sk, true);
3094 dev_curr = po->prot_hook.dev;
3096 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3101 po->prot_hook.type = proto;
3103 if (unlikely(unlisted)) {
3105 po->prot_hook.dev = NULL;
3107 packet_cached_dev_reset(po);
3109 po->prot_hook.dev = dev;
3110 po->ifindex = dev ? dev->ifindex : 0;
3111 packet_cached_dev_assign(po, dev);
3117 if (proto == 0 || !need_rehook)
3120 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3121 register_prot_hook(sk);
3123 sk->sk_err = ENETDOWN;
3124 if (!sock_flag(sk, SOCK_DEAD))
3125 sk->sk_error_report(sk);
3130 spin_unlock(&po->bind_lock);
3136 * Bind a packet socket to a device
3139 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3142 struct sock *sk = sock->sk;
3143 char name[sizeof(uaddr->sa_data) + 1];
3149 if (addr_len != sizeof(struct sockaddr))
3151 /* uaddr->sa_data comes from the userspace, it's not guaranteed to be
3154 memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data));
3155 name[sizeof(uaddr->sa_data)] = 0;
3157 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3160 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3162 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3163 struct sock *sk = sock->sk;
3169 if (addr_len < sizeof(struct sockaddr_ll))
3171 if (sll->sll_family != AF_PACKET)
3174 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3175 sll->sll_protocol ? : pkt_sk(sk)->num);
3178 static struct proto packet_proto = {
3180 .owner = THIS_MODULE,
3181 .obj_size = sizeof(struct packet_sock),
3185 * Create a packet of type SOCK_PACKET.
3188 static int packet_create(struct net *net, struct socket *sock, int protocol,
3192 struct packet_sock *po;
3193 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3196 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3198 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3199 sock->type != SOCK_PACKET)
3200 return -ESOCKTNOSUPPORT;
3202 sock->state = SS_UNCONNECTED;
3205 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3209 sock->ops = &packet_ops;
3210 if (sock->type == SOCK_PACKET)
3211 sock->ops = &packet_ops_spkt;
3213 sock_init_data(sock, sk);
3216 sk->sk_family = PF_PACKET;
3218 po->xmit = dev_queue_xmit;
3220 err = packet_alloc_pending(po);
3224 packet_cached_dev_reset(po);
3226 sk->sk_destruct = packet_sock_destruct;
3227 sk_refcnt_debug_inc(sk);
3230 * Attach a protocol block
3233 spin_lock_init(&po->bind_lock);
3234 mutex_init(&po->pg_vec_lock);
3235 po->rollover = NULL;
3236 po->prot_hook.func = packet_rcv;
3238 if (sock->type == SOCK_PACKET)
3239 po->prot_hook.func = packet_rcv_spkt;
3241 po->prot_hook.af_packet_priv = sk;
3244 po->prot_hook.type = proto;
3245 register_prot_hook(sk);
3248 mutex_lock(&net->packet.sklist_lock);
3249 sk_add_node_rcu(sk, &net->packet.sklist);
3250 mutex_unlock(&net->packet.sklist_lock);
3253 sock_prot_inuse_add(net, &packet_proto, 1);
3264 * Pull a packet from our receive queue and hand it to the user.
3265 * If necessary we block.
3268 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3271 struct sock *sk = sock->sk;
3272 struct sk_buff *skb;
3274 int vnet_hdr_len = 0;
3275 unsigned int origlen = 0;
3278 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3282 /* What error should we return now? EUNATTACH? */
3283 if (pkt_sk(sk)->ifindex < 0)
3287 if (flags & MSG_ERRQUEUE) {
3288 err = sock_recv_errqueue(sk, msg, len,
3289 SOL_PACKET, PACKET_TX_TIMESTAMP);
3294 * Call the generic datagram receiver. This handles all sorts
3295 * of horrible races and re-entrancy so we can forget about it
3296 * in the protocol layers.
3298 * Now it will return ENETDOWN, if device have just gone down,
3299 * but then it will block.
3302 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3305 * An error occurred so return it. Because skb_recv_datagram()
3306 * handles the blocking we don't see and worry about blocking
3313 if (pkt_sk(sk)->pressure)
3314 packet_rcv_has_room(pkt_sk(sk), NULL);
3316 if (pkt_sk(sk)->has_vnet_hdr) {
3317 err = packet_rcv_vnet(msg, skb, &len);
3320 vnet_hdr_len = sizeof(struct virtio_net_hdr);
3323 /* You lose any data beyond the buffer you gave. If it worries
3324 * a user program they can ask the device for its MTU
3330 msg->msg_flags |= MSG_TRUNC;
3333 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3337 if (sock->type != SOCK_PACKET) {
3338 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3340 /* Original length was stored in sockaddr_ll fields */
3341 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3342 sll->sll_family = AF_PACKET;
3343 sll->sll_protocol = skb->protocol;
3346 sock_recv_ts_and_drops(msg, sk, skb);
3348 if (msg->msg_name) {
3349 /* If the address length field is there to be filled
3350 * in, we fill it in now.
3352 if (sock->type == SOCK_PACKET) {
3353 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3354 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3356 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3358 msg->msg_namelen = sll->sll_halen +
3359 offsetof(struct sockaddr_ll, sll_addr);
3361 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
3365 if (pkt_sk(sk)->auxdata) {
3366 struct tpacket_auxdata aux;
3368 aux.tp_status = TP_STATUS_USER;
3369 if (skb->ip_summed == CHECKSUM_PARTIAL)
3370 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3371 else if (skb->pkt_type != PACKET_OUTGOING &&
3372 (skb->ip_summed == CHECKSUM_COMPLETE ||
3373 skb_csum_unnecessary(skb)))
3374 aux.tp_status |= TP_STATUS_CSUM_VALID;
3376 aux.tp_len = origlen;
3377 aux.tp_snaplen = skb->len;
3379 aux.tp_net = skb_network_offset(skb);
3380 if (skb_vlan_tag_present(skb)) {
3381 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3382 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3383 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3385 aux.tp_vlan_tci = 0;
3386 aux.tp_vlan_tpid = 0;
3388 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3392 * Free or return the buffer as appropriate. Again this
3393 * hides all the races and re-entrancy issues from us.
3395 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3398 skb_free_datagram(sk, skb);
3403 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3404 int *uaddr_len, int peer)
3406 struct net_device *dev;
3407 struct sock *sk = sock->sk;
3412 uaddr->sa_family = AF_PACKET;
3413 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3415 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3417 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3419 *uaddr_len = sizeof(*uaddr);
3424 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3425 int *uaddr_len, int peer)
3427 struct net_device *dev;
3428 struct sock *sk = sock->sk;
3429 struct packet_sock *po = pkt_sk(sk);
3430 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3435 sll->sll_family = AF_PACKET;
3436 sll->sll_ifindex = po->ifindex;
3437 sll->sll_protocol = po->num;
3438 sll->sll_pkttype = 0;
3440 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
3442 sll->sll_hatype = dev->type;
3443 sll->sll_halen = dev->addr_len;
3444 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3446 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3450 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3455 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3459 case PACKET_MR_MULTICAST:
3460 if (i->alen != dev->addr_len)
3463 return dev_mc_add(dev, i->addr);
3465 return dev_mc_del(dev, i->addr);
3467 case PACKET_MR_PROMISC:
3468 return dev_set_promiscuity(dev, what);
3469 case PACKET_MR_ALLMULTI:
3470 return dev_set_allmulti(dev, what);
3471 case PACKET_MR_UNICAST:
3472 if (i->alen != dev->addr_len)
3475 return dev_uc_add(dev, i->addr);
3477 return dev_uc_del(dev, i->addr);
3485 static void packet_dev_mclist_delete(struct net_device *dev,
3486 struct packet_mclist **mlp)
3488 struct packet_mclist *ml;
3490 while ((ml = *mlp) != NULL) {
3491 if (ml->ifindex == dev->ifindex) {
3492 packet_dev_mc(dev, ml, -1);
3500 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3502 struct packet_sock *po = pkt_sk(sk);
3503 struct packet_mclist *ml, *i;
3504 struct net_device *dev;
3510 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3515 if (mreq->mr_alen > dev->addr_len)
3519 i = kmalloc(sizeof(*i), GFP_KERNEL);
3524 for (ml = po->mclist; ml; ml = ml->next) {
3525 if (ml->ifindex == mreq->mr_ifindex &&
3526 ml->type == mreq->mr_type &&
3527 ml->alen == mreq->mr_alen &&
3528 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3530 /* Free the new element ... */
3536 i->type = mreq->mr_type;
3537 i->ifindex = mreq->mr_ifindex;
3538 i->alen = mreq->mr_alen;
3539 memcpy(i->addr, mreq->mr_address, i->alen);
3540 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
3542 i->next = po->mclist;
3544 err = packet_dev_mc(dev, i, 1);
3546 po->mclist = i->next;
3555 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3557 struct packet_mclist *ml, **mlp;
3561 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3562 if (ml->ifindex == mreq->mr_ifindex &&
3563 ml->type == mreq->mr_type &&
3564 ml->alen == mreq->mr_alen &&
3565 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3566 if (--ml->count == 0) {
3567 struct net_device *dev;
3569 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3571 packet_dev_mc(dev, ml, -1);
3581 static void packet_flush_mclist(struct sock *sk)
3583 struct packet_sock *po = pkt_sk(sk);
3584 struct packet_mclist *ml;
3590 while ((ml = po->mclist) != NULL) {
3591 struct net_device *dev;
3593 po->mclist = ml->next;
3594 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3596 packet_dev_mc(dev, ml, -1);
3603 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3605 struct sock *sk = sock->sk;
3606 struct packet_sock *po = pkt_sk(sk);
3609 if (level != SOL_PACKET)
3610 return -ENOPROTOOPT;
3613 case PACKET_ADD_MEMBERSHIP:
3614 case PACKET_DROP_MEMBERSHIP:
3616 struct packet_mreq_max mreq;
3618 memset(&mreq, 0, sizeof(mreq));
3619 if (len < sizeof(struct packet_mreq))
3621 if (len > sizeof(mreq))
3623 if (copy_from_user(&mreq, optval, len))
3625 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3627 if (optname == PACKET_ADD_MEMBERSHIP)
3628 ret = packet_mc_add(sk, &mreq);
3630 ret = packet_mc_drop(sk, &mreq);
3634 case PACKET_RX_RING:
3635 case PACKET_TX_RING:
3637 union tpacket_req_u req_u;
3640 switch (po->tp_version) {
3643 len = sizeof(req_u.req);
3647 len = sizeof(req_u.req3);
3652 if (copy_from_user(&req_u.req, optval, len))
3654 return packet_set_ring(sk, &req_u, 0,
3655 optname == PACKET_TX_RING);
3657 case PACKET_COPY_THRESH:
3661 if (optlen != sizeof(val))
3663 if (copy_from_user(&val, optval, sizeof(val)))
3666 pkt_sk(sk)->copy_thresh = val;
3669 case PACKET_VERSION:
3673 if (optlen != sizeof(val))
3675 if (copy_from_user(&val, optval, sizeof(val)))
3686 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3689 po->tp_version = val;
3695 case PACKET_RESERVE:
3699 if (optlen != sizeof(val))
3701 if (copy_from_user(&val, optval, sizeof(val)))
3706 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3709 po->tp_reserve = val;
3719 if (optlen != sizeof(val))
3721 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3723 if (copy_from_user(&val, optval, sizeof(val)))
3725 po->tp_loss = !!val;
3728 case PACKET_AUXDATA:
3732 if (optlen < sizeof(val))
3734 if (copy_from_user(&val, optval, sizeof(val)))
3737 po->auxdata = !!val;
3740 case PACKET_ORIGDEV:
3744 if (optlen < sizeof(val))
3746 if (copy_from_user(&val, optval, sizeof(val)))
3749 po->origdev = !!val;
3752 case PACKET_VNET_HDR:
3756 if (sock->type != SOCK_RAW)
3758 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3760 if (optlen < sizeof(val))
3762 if (copy_from_user(&val, optval, sizeof(val)))
3765 po->has_vnet_hdr = !!val;
3768 case PACKET_TIMESTAMP:
3772 if (optlen != sizeof(val))
3774 if (copy_from_user(&val, optval, sizeof(val)))
3777 po->tp_tstamp = val;
3784 if (optlen != sizeof(val))
3786 if (copy_from_user(&val, optval, sizeof(val)))
3789 return fanout_add(sk, val & 0xffff, val >> 16);
3791 case PACKET_FANOUT_DATA:
3796 return fanout_set_data(po, optval, optlen);
3798 case PACKET_TX_HAS_OFF:
3802 if (optlen != sizeof(val))
3804 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3806 if (copy_from_user(&val, optval, sizeof(val)))
3808 po->tp_tx_has_off = !!val;
3811 case PACKET_QDISC_BYPASS:
3815 if (optlen != sizeof(val))
3817 if (copy_from_user(&val, optval, sizeof(val)))
3820 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3824 return -ENOPROTOOPT;
3828 static int packet_getsockopt(struct socket *sock, int level, int optname,
3829 char __user *optval, int __user *optlen)
3832 int val, lv = sizeof(val);
3833 struct sock *sk = sock->sk;
3834 struct packet_sock *po = pkt_sk(sk);
3836 union tpacket_stats_u st;
3837 struct tpacket_rollover_stats rstats;
3839 if (level != SOL_PACKET)
3840 return -ENOPROTOOPT;
3842 if (get_user(len, optlen))
3849 case PACKET_STATISTICS:
3850 spin_lock_bh(&sk->sk_receive_queue.lock);
3851 memcpy(&st, &po->stats, sizeof(st));
3852 memset(&po->stats, 0, sizeof(po->stats));
3853 spin_unlock_bh(&sk->sk_receive_queue.lock);
3855 if (po->tp_version == TPACKET_V3) {
3856 lv = sizeof(struct tpacket_stats_v3);
3857 st.stats3.tp_packets += st.stats3.tp_drops;
3860 lv = sizeof(struct tpacket_stats);
3861 st.stats1.tp_packets += st.stats1.tp_drops;
3866 case PACKET_AUXDATA:
3869 case PACKET_ORIGDEV:
3872 case PACKET_VNET_HDR:
3873 val = po->has_vnet_hdr;
3875 case PACKET_VERSION:
3876 val = po->tp_version;
3879 if (len > sizeof(int))
3881 if (len < sizeof(int))
3883 if (copy_from_user(&val, optval, len))
3887 val = sizeof(struct tpacket_hdr);
3890 val = sizeof(struct tpacket2_hdr);
3893 val = sizeof(struct tpacket3_hdr);
3899 case PACKET_RESERVE:
3900 val = po->tp_reserve;
3905 case PACKET_TIMESTAMP:
3906 val = po->tp_tstamp;
3910 ((u32)po->fanout->id |
3911 ((u32)po->fanout->type << 16) |
3912 ((u32)po->fanout->flags << 24)) :
3915 case PACKET_ROLLOVER_STATS:
3918 rstats.tp_all = atomic_long_read(&po->rollover->num);
3919 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3920 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3922 lv = sizeof(rstats);
3924 case PACKET_TX_HAS_OFF:
3925 val = po->tp_tx_has_off;
3927 case PACKET_QDISC_BYPASS:
3928 val = packet_use_direct_xmit(po);
3931 return -ENOPROTOOPT;
3936 if (put_user(len, optlen))
3938 if (copy_to_user(optval, data, len))
3944 #ifdef CONFIG_COMPAT
3945 static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
3946 char __user *optval, unsigned int optlen)
3948 struct packet_sock *po = pkt_sk(sock->sk);
3950 if (level != SOL_PACKET)
3951 return -ENOPROTOOPT;
3953 if (optname == PACKET_FANOUT_DATA &&
3954 po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
3955 optval = (char __user *)get_compat_bpf_fprog(optval);
3958 optlen = sizeof(struct sock_fprog);
3961 return packet_setsockopt(sock, level, optname, optval, optlen);
3965 static int packet_notifier(struct notifier_block *this,
3966 unsigned long msg, void *ptr)
3969 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3970 struct net *net = dev_net(dev);
3973 sk_for_each_rcu(sk, &net->packet.sklist) {
3974 struct packet_sock *po = pkt_sk(sk);
3977 case NETDEV_UNREGISTER:
3979 packet_dev_mclist_delete(dev, &po->mclist);
3983 if (dev->ifindex == po->ifindex) {
3984 spin_lock(&po->bind_lock);
3986 __unregister_prot_hook(sk, false);
3987 sk->sk_err = ENETDOWN;
3988 if (!sock_flag(sk, SOCK_DEAD))
3989 sk->sk_error_report(sk);
3991 if (msg == NETDEV_UNREGISTER) {
3992 packet_cached_dev_reset(po);
3994 if (po->prot_hook.dev)
3995 dev_put(po->prot_hook.dev);
3996 po->prot_hook.dev = NULL;
3998 spin_unlock(&po->bind_lock);
4002 if (dev->ifindex == po->ifindex) {
4003 spin_lock(&po->bind_lock);
4005 register_prot_hook(sk);
4006 spin_unlock(&po->bind_lock);
4016 static int packet_ioctl(struct socket *sock, unsigned int cmd,
4019 struct sock *sk = sock->sk;
4024 int amount = sk_wmem_alloc_get(sk);
4026 return put_user(amount, (int __user *)arg);
4030 struct sk_buff *skb;
4033 spin_lock_bh(&sk->sk_receive_queue.lock);
4034 skb = skb_peek(&sk->sk_receive_queue);
4037 spin_unlock_bh(&sk->sk_receive_queue.lock);
4038 return put_user(amount, (int __user *)arg);
4041 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4043 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4053 case SIOCGIFBRDADDR:
4054 case SIOCSIFBRDADDR:
4055 case SIOCGIFNETMASK:
4056 case SIOCSIFNETMASK:
4057 case SIOCGIFDSTADDR:
4058 case SIOCSIFDSTADDR:
4060 return inet_dgram_ops.ioctl(sock, cmd, arg);
4064 return -ENOIOCTLCMD;
4069 static unsigned int packet_poll(struct file *file, struct socket *sock,
4072 struct sock *sk = sock->sk;
4073 struct packet_sock *po = pkt_sk(sk);
4074 unsigned int mask = datagram_poll(file, sock, wait);
4076 spin_lock_bh(&sk->sk_receive_queue.lock);
4077 if (po->rx_ring.pg_vec) {
4078 if (!packet_previous_rx_frame(po, &po->rx_ring,
4080 mask |= POLLIN | POLLRDNORM;
4082 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4084 spin_unlock_bh(&sk->sk_receive_queue.lock);
4085 spin_lock_bh(&sk->sk_write_queue.lock);
4086 if (po->tx_ring.pg_vec) {
4087 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4088 mask |= POLLOUT | POLLWRNORM;
4090 spin_unlock_bh(&sk->sk_write_queue.lock);
4095 /* Dirty? Well, I still did not learn better way to account
4099 static void packet_mm_open(struct vm_area_struct *vma)
4101 struct file *file = vma->vm_file;
4102 struct socket *sock = file->private_data;
4103 struct sock *sk = sock->sk;
4106 atomic_inc(&pkt_sk(sk)->mapped);
4109 static void packet_mm_close(struct vm_area_struct *vma)
4111 struct file *file = vma->vm_file;
4112 struct socket *sock = file->private_data;
4113 struct sock *sk = sock->sk;
4116 atomic_dec(&pkt_sk(sk)->mapped);
4119 static const struct vm_operations_struct packet_mmap_ops = {
4120 .open = packet_mm_open,
4121 .close = packet_mm_close,
4124 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4129 for (i = 0; i < len; i++) {
4130 if (likely(pg_vec[i].buffer)) {
4131 if (is_vmalloc_addr(pg_vec[i].buffer))
4132 vfree(pg_vec[i].buffer);
4134 free_pages((unsigned long)pg_vec[i].buffer,
4136 pg_vec[i].buffer = NULL;
4142 static char *alloc_one_pg_vec_page(unsigned long order)
4145 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4146 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4148 buffer = (char *) __get_free_pages(gfp_flags, order);
4152 /* __get_free_pages failed, fall back to vmalloc */
4153 buffer = vzalloc((1 << order) * PAGE_SIZE);
4157 /* vmalloc failed, lets dig into swap here */
4158 gfp_flags &= ~__GFP_NORETRY;
4159 buffer = (char *) __get_free_pages(gfp_flags, order);
4163 /* complete and utter failure */
4167 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4169 unsigned int block_nr = req->tp_block_nr;
4173 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4174 if (unlikely(!pg_vec))
4177 for (i = 0; i < block_nr; i++) {
4178 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4179 if (unlikely(!pg_vec[i].buffer))
4180 goto out_free_pgvec;
4187 free_pg_vec(pg_vec, order, block_nr);
4192 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4193 int closing, int tx_ring)
4195 struct pgv *pg_vec = NULL;
4196 struct packet_sock *po = pkt_sk(sk);
4197 int was_running, order = 0;
4198 struct packet_ring_buffer *rb;
4199 struct sk_buff_head *rb_queue;
4202 /* Added to avoid minimal code churn */
4203 struct tpacket_req *req = &req_u->req;
4207 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4208 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4212 if (atomic_read(&po->mapped))
4214 if (packet_read_pending(rb))
4218 if (req->tp_block_nr) {
4219 /* Sanity tests and some calculations */
4221 if (unlikely(rb->pg_vec))
4224 switch (po->tp_version) {
4226 po->tp_hdrlen = TPACKET_HDRLEN;
4229 po->tp_hdrlen = TPACKET2_HDRLEN;
4232 po->tp_hdrlen = TPACKET3_HDRLEN;
4237 if (unlikely((int)req->tp_block_size <= 0))
4239 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4241 if (po->tp_version >= TPACKET_V3 &&
4242 req->tp_block_size <=
4243 BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv))
4245 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
4248 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4251 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4252 if (unlikely(rb->frames_per_block == 0))
4254 if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr))
4256 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4261 order = get_order(req->tp_block_size);
4262 pg_vec = alloc_pg_vec(req, order);
4263 if (unlikely(!pg_vec))
4265 switch (po->tp_version) {
4267 /* Block transmit is not supported yet */
4269 init_prb_bdqc(po, rb, pg_vec, req_u);
4271 struct tpacket_req3 *req3 = &req_u->req3;
4273 if (req3->tp_retire_blk_tov ||
4274 req3->tp_sizeof_priv ||
4275 req3->tp_feature_req_word) {
4288 if (unlikely(req->tp_frame_nr))
4293 /* Detach socket from network */
4294 spin_lock(&po->bind_lock);
4295 was_running = po->running;
4299 __unregister_prot_hook(sk, false);
4301 spin_unlock(&po->bind_lock);
4306 mutex_lock(&po->pg_vec_lock);
4307 if (closing || atomic_read(&po->mapped) == 0) {
4309 spin_lock_bh(&rb_queue->lock);
4310 swap(rb->pg_vec, pg_vec);
4311 rb->frame_max = (req->tp_frame_nr - 1);
4313 rb->frame_size = req->tp_frame_size;
4314 spin_unlock_bh(&rb_queue->lock);
4316 swap(rb->pg_vec_order, order);
4317 swap(rb->pg_vec_len, req->tp_block_nr);
4319 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4320 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4321 tpacket_rcv : packet_rcv;
4322 skb_queue_purge(rb_queue);
4323 if (atomic_read(&po->mapped))
4324 pr_err("packet_mmap: vma is busy: %d\n",
4325 atomic_read(&po->mapped));
4327 mutex_unlock(&po->pg_vec_lock);
4329 spin_lock(&po->bind_lock);
4332 register_prot_hook(sk);
4334 spin_unlock(&po->bind_lock);
4335 if (pg_vec && (po->tp_version > TPACKET_V2)) {
4336 /* Because we don't support block-based V3 on tx-ring */
4338 prb_shutdown_retire_blk_timer(po, rb_queue);
4342 free_pg_vec(pg_vec, order, req->tp_block_nr);
4348 static int packet_mmap(struct file *file, struct socket *sock,
4349 struct vm_area_struct *vma)
4351 struct sock *sk = sock->sk;
4352 struct packet_sock *po = pkt_sk(sk);
4353 unsigned long size, expected_size;
4354 struct packet_ring_buffer *rb;
4355 unsigned long start;
4362 mutex_lock(&po->pg_vec_lock);
4365 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4367 expected_size += rb->pg_vec_len
4373 if (expected_size == 0)
4376 size = vma->vm_end - vma->vm_start;
4377 if (size != expected_size)
4380 start = vma->vm_start;
4381 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4382 if (rb->pg_vec == NULL)
4385 for (i = 0; i < rb->pg_vec_len; i++) {
4387 void *kaddr = rb->pg_vec[i].buffer;
4390 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4391 page = pgv_to_page(kaddr);
4392 err = vm_insert_page(vma, start, page);
4401 atomic_inc(&po->mapped);
4402 vma->vm_ops = &packet_mmap_ops;
4406 mutex_unlock(&po->pg_vec_lock);
4410 static const struct proto_ops packet_ops_spkt = {
4411 .family = PF_PACKET,
4412 .owner = THIS_MODULE,
4413 .release = packet_release,
4414 .bind = packet_bind_spkt,
4415 .connect = sock_no_connect,
4416 .socketpair = sock_no_socketpair,
4417 .accept = sock_no_accept,
4418 .getname = packet_getname_spkt,
4419 .poll = datagram_poll,
4420 .ioctl = packet_ioctl,
4421 .listen = sock_no_listen,
4422 .shutdown = sock_no_shutdown,
4423 .setsockopt = sock_no_setsockopt,
4424 .getsockopt = sock_no_getsockopt,
4425 .sendmsg = packet_sendmsg_spkt,
4426 .recvmsg = packet_recvmsg,
4427 .mmap = sock_no_mmap,
4428 .sendpage = sock_no_sendpage,
4431 static const struct proto_ops packet_ops = {
4432 .family = PF_PACKET,
4433 .owner = THIS_MODULE,
4434 .release = packet_release,
4435 .bind = packet_bind,
4436 .connect = sock_no_connect,
4437 .socketpair = sock_no_socketpair,
4438 .accept = sock_no_accept,
4439 .getname = packet_getname,
4440 .poll = packet_poll,
4441 .ioctl = packet_ioctl,
4442 .listen = sock_no_listen,
4443 .shutdown = sock_no_shutdown,
4444 .setsockopt = packet_setsockopt,
4445 .getsockopt = packet_getsockopt,
4446 #ifdef CONFIG_COMPAT
4447 .compat_setsockopt = compat_packet_setsockopt,
4449 .sendmsg = packet_sendmsg,
4450 .recvmsg = packet_recvmsg,
4451 .mmap = packet_mmap,
4452 .sendpage = sock_no_sendpage,
4455 static const struct net_proto_family packet_family_ops = {
4456 .family = PF_PACKET,
4457 .create = packet_create,
4458 .owner = THIS_MODULE,
4461 static struct notifier_block packet_netdev_notifier = {
4462 .notifier_call = packet_notifier,
4465 #ifdef CONFIG_PROC_FS
4467 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4470 struct net *net = seq_file_net(seq);
4473 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4476 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4478 struct net *net = seq_file_net(seq);
4479 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4482 static void packet_seq_stop(struct seq_file *seq, void *v)
4488 static int packet_seq_show(struct seq_file *seq, void *v)
4490 if (v == SEQ_START_TOKEN)
4491 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4493 struct sock *s = sk_entry(v);
4494 const struct packet_sock *po = pkt_sk(s);
4497 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4499 refcount_read(&s->sk_refcnt),
4504 atomic_read(&s->sk_rmem_alloc),
4505 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4512 static const struct seq_operations packet_seq_ops = {
4513 .start = packet_seq_start,
4514 .next = packet_seq_next,
4515 .stop = packet_seq_stop,
4516 .show = packet_seq_show,
4519 static int packet_seq_open(struct inode *inode, struct file *file)
4521 return seq_open_net(inode, file, &packet_seq_ops,
4522 sizeof(struct seq_net_private));
4525 static const struct file_operations packet_seq_fops = {
4526 .owner = THIS_MODULE,
4527 .open = packet_seq_open,
4529 .llseek = seq_lseek,
4530 .release = seq_release_net,
4535 static int __net_init packet_net_init(struct net *net)
4537 mutex_init(&net->packet.sklist_lock);
4538 INIT_HLIST_HEAD(&net->packet.sklist);
4540 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4546 static void __net_exit packet_net_exit(struct net *net)
4548 remove_proc_entry("packet", net->proc_net);
4551 static struct pernet_operations packet_net_ops = {
4552 .init = packet_net_init,
4553 .exit = packet_net_exit,
4557 static void __exit packet_exit(void)
4559 unregister_netdevice_notifier(&packet_netdev_notifier);
4560 unregister_pernet_subsys(&packet_net_ops);
4561 sock_unregister(PF_PACKET);
4562 proto_unregister(&packet_proto);
4565 static int __init packet_init(void)
4567 int rc = proto_register(&packet_proto, 0);
4572 sock_register(&packet_family_ops);
4573 register_pernet_subsys(&packet_net_ops);
4574 register_netdevice_notifier(&packet_netdev_notifier);
4579 module_init(packet_init);
4580 module_exit(packet_exit);
4581 MODULE_LICENSE("GPL");
4582 MODULE_ALIAS_NETPROTO(PF_PACKET);