2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * PACKET - implements raw packet sockets.
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
13 * Alan Cox : verify_area() now used correctly
14 * Alan Cox : new skbuff lists, look ma no backlogs!
15 * Alan Cox : tidied skbuff lists.
16 * Alan Cox : Now uses generic datagram routines I
17 * added. Also fixed the peek/read crash
18 * from all old Linux datagram code.
19 * Alan Cox : Uses the improved datagram code.
20 * Alan Cox : Added NULL's for socket options.
21 * Alan Cox : Re-commented the code.
22 * Alan Cox : Use new kernel side addressing
23 * Rob Janssen : Correct MTU usage.
24 * Dave Platt : Counter leaks caused by incorrect
25 * interrupt locking and some slightly
26 * dubious gcc output. Can you read
27 * compiler: it said _VOLATILE_
28 * Richard Kooijman : Timestamp fixes.
29 * Alan Cox : New buffers. Use sk->mac.raw.
30 * Alan Cox : sendmsg/recvmsg support.
31 * Alan Cox : Protocol setting support
32 * Alexey Kuznetsov : Untied from IPv4 stack.
33 * Cyrus Durgin : Fixed kerneld for kmod.
34 * Michal Ostrowski : Module initialization cleanup.
35 * Ulises Alonso : Frame number limit removal and
36 * packet_set_ring memory leak.
37 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
40 * byte arrays at the end of sockaddr_ll
42 * Johann Baudy : Added TX RING.
43 * Chetan Loke : Implemented TPACKET_V3 block abstraction
45 * Copyright (C) 2011, <lokec@ccs.neu.edu>
48 * This program is free software; you can redistribute it and/or
49 * modify it under the terms of the GNU General Public License
50 * as published by the Free Software Foundation; either version
51 * 2 of the License, or (at your option) any later version.
55 #include <linux/types.h>
57 #include <linux/capability.h>
58 #include <linux/fcntl.h>
59 #include <linux/socket.h>
61 #include <linux/inet.h>
62 #include <linux/netdevice.h>
63 #include <linux/if_packet.h>
64 #include <linux/wireless.h>
65 #include <linux/kernel.h>
66 #include <linux/kmod.h>
67 #include <linux/slab.h>
68 #include <linux/vmalloc.h>
69 #include <net/net_namespace.h>
71 #include <net/protocol.h>
72 #include <linux/skbuff.h>
74 #include <linux/errno.h>
75 #include <linux/timer.h>
76 #include <asm/uaccess.h>
77 #include <asm/ioctls.h>
79 #include <asm/cacheflush.h>
81 #include <linux/proc_fs.h>
82 #include <linux/seq_file.h>
83 #include <linux/poll.h>
84 #include <linux/module.h>
85 #include <linux/init.h>
86 #include <linux/mutex.h>
87 #include <linux/if_vlan.h>
88 #include <linux/virtio_net.h>
89 #include <linux/errqueue.h>
90 #include <linux/net_tstamp.h>
91 #include <linux/percpu.h>
93 #include <net/inet_common.h>
95 #include <linux/bpf.h>
101 - if device has no dev->hard_header routine, it adds and removes ll header
102 inside itself. In this case ll header is invisible outside of device,
103 but higher levels still should reserve dev->hard_header_len.
104 Some devices are enough clever to reallocate skb, when header
105 will not fit to reserved space (tunnel), another ones are silly
107 - packet socket receives packets with pulled ll header,
108 so that SOCK_RAW should push it back.
113 Incoming, dev->hard_header!=NULL
114 mac_header -> ll header
117 Outgoing, dev->hard_header!=NULL
118 mac_header -> ll header
121 Incoming, dev->hard_header==NULL
122 mac_header -> UNKNOWN position. It is very likely, that it points to ll
123 header. PPP makes it, that is wrong, because introduce
124 assymetry between rx and tx paths.
127 Outgoing, dev->hard_header==NULL
128 mac_header -> data. ll header is still not built!
132 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
138 dev->hard_header != NULL
139 mac_header -> ll header
142 dev->hard_header == NULL (ll header is added by device, we cannot control it)
146 We should set nh.raw on output to correct posistion,
147 packet classifier depends on it.
150 /* Private packet socket structures. */
152 /* identical to struct packet_mreq except it has
153 * a longer address field.
155 struct packet_mreq_max {
157 unsigned short mr_type;
158 unsigned short mr_alen;
159 unsigned char mr_address[MAX_ADDR_LEN];
163 struct tpacket_hdr *h1;
164 struct tpacket2_hdr *h2;
165 struct tpacket3_hdr *h3;
169 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
170 int closing, int tx_ring);
172 #define V3_ALIGNMENT (8)
174 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
176 #define BLK_PLUS_PRIV(sz_of_priv) \
177 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
179 #define PGV_FROM_VMALLOC 1
181 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
182 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
183 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
184 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
185 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
186 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
187 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
190 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
191 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
192 struct packet_type *pt, struct net_device *orig_dev);
194 static void *packet_previous_frame(struct packet_sock *po,
195 struct packet_ring_buffer *rb,
197 static void packet_increment_head(struct packet_ring_buffer *buff);
198 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
199 struct tpacket_block_desc *);
200 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
201 struct packet_sock *);
202 static void prb_retire_current_block(struct tpacket_kbdq_core *,
203 struct packet_sock *, unsigned int status);
204 static int prb_queue_frozen(struct tpacket_kbdq_core *);
205 static void prb_open_block(struct tpacket_kbdq_core *,
206 struct tpacket_block_desc *);
207 static void prb_retire_rx_blk_timer_expired(unsigned long);
208 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
209 static void prb_init_blk_timer(struct packet_sock *,
210 struct tpacket_kbdq_core *,
211 void (*func) (unsigned long));
212 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
213 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
214 struct tpacket3_hdr *);
215 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
216 struct tpacket3_hdr *);
217 static void packet_flush_mclist(struct sock *sk);
219 struct packet_skb_cb {
221 struct sockaddr_pkt pkt;
223 /* Trick: alias skb original length with
224 * ll.sll_family and ll.protocol in order
227 unsigned int origlen;
228 struct sockaddr_ll ll;
233 #define vio_le() virtio_legacy_is_little_endian()
235 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
237 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
238 #define GET_PBLOCK_DESC(x, bid) \
239 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
240 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
241 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
242 #define GET_NEXT_PRB_BLK_NUM(x) \
243 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
244 ((x)->kactive_blk_num+1) : 0)
246 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
247 static void __fanout_link(struct sock *sk, struct packet_sock *po);
249 static int packet_direct_xmit(struct sk_buff *skb)
251 struct net_device *dev = skb->dev;
252 netdev_features_t features;
253 struct netdev_queue *txq;
254 int ret = NETDEV_TX_BUSY;
256 if (unlikely(!netif_running(dev) ||
257 !netif_carrier_ok(dev)))
260 features = netif_skb_features(skb);
261 if (skb_needs_linearize(skb, features) &&
262 __skb_linearize(skb))
265 txq = skb_get_tx_queue(dev, skb);
269 HARD_TX_LOCK(dev, txq, smp_processor_id());
270 if (!netif_xmit_frozen_or_drv_stopped(txq))
271 ret = netdev_start_xmit(skb, dev, txq, false);
272 HARD_TX_UNLOCK(dev, txq);
276 if (!dev_xmit_complete(ret))
281 atomic_long_inc(&dev->tx_dropped);
283 return NET_XMIT_DROP;
286 static struct net_device *packet_cached_dev_get(struct packet_sock *po)
288 struct net_device *dev;
291 dev = rcu_dereference(po->cached_dev);
299 static void packet_cached_dev_assign(struct packet_sock *po,
300 struct net_device *dev)
302 rcu_assign_pointer(po->cached_dev, dev);
305 static void packet_cached_dev_reset(struct packet_sock *po)
307 RCU_INIT_POINTER(po->cached_dev, NULL);
310 static bool packet_use_direct_xmit(const struct packet_sock *po)
312 return po->xmit == packet_direct_xmit;
315 static u16 __packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
317 return (u16) raw_smp_processor_id() % dev->real_num_tx_queues;
320 static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
322 const struct net_device_ops *ops = dev->netdev_ops;
325 if (ops->ndo_select_queue) {
326 queue_index = ops->ndo_select_queue(dev, skb, NULL,
327 __packet_pick_tx_queue);
328 queue_index = netdev_cap_txqueue(dev, queue_index);
330 queue_index = __packet_pick_tx_queue(dev, skb);
333 skb_set_queue_mapping(skb, queue_index);
336 /* register_prot_hook must be invoked with the po->bind_lock held,
337 * or from a context in which asynchronous accesses to the packet
338 * socket is not possible (packet_create()).
340 static void register_prot_hook(struct sock *sk)
342 struct packet_sock *po = pkt_sk(sk);
346 __fanout_link(sk, po);
348 dev_add_pack(&po->prot_hook);
355 /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
356 * held. If the sync parameter is true, we will temporarily drop
357 * the po->bind_lock and do a synchronize_net to make sure no
358 * asynchronous packet processing paths still refer to the elements
359 * of po->prot_hook. If the sync parameter is false, it is the
360 * callers responsibility to take care of this.
362 static void __unregister_prot_hook(struct sock *sk, bool sync)
364 struct packet_sock *po = pkt_sk(sk);
369 __fanout_unlink(sk, po);
371 __dev_remove_pack(&po->prot_hook);
376 spin_unlock(&po->bind_lock);
378 spin_lock(&po->bind_lock);
382 static void unregister_prot_hook(struct sock *sk, bool sync)
384 struct packet_sock *po = pkt_sk(sk);
387 __unregister_prot_hook(sk, sync);
390 static inline struct page * __pure pgv_to_page(void *addr)
392 if (is_vmalloc_addr(addr))
393 return vmalloc_to_page(addr);
394 return virt_to_page(addr);
397 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
399 union tpacket_uhdr h;
402 switch (po->tp_version) {
404 h.h1->tp_status = status;
405 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
408 h.h2->tp_status = status;
409 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
413 WARN(1, "TPACKET version not supported.\n");
420 static int __packet_get_status(struct packet_sock *po, void *frame)
422 union tpacket_uhdr h;
427 switch (po->tp_version) {
429 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
430 return h.h1->tp_status;
432 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
433 return h.h2->tp_status;
436 WARN(1, "TPACKET version not supported.\n");
442 static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
445 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
448 (flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
449 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
450 return TP_STATUS_TS_RAW_HARDWARE;
452 if (ktime_to_timespec_cond(skb->tstamp, ts))
453 return TP_STATUS_TS_SOFTWARE;
458 static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
461 union tpacket_uhdr h;
465 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
469 switch (po->tp_version) {
471 h.h1->tp_sec = ts.tv_sec;
472 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
475 h.h2->tp_sec = ts.tv_sec;
476 h.h2->tp_nsec = ts.tv_nsec;
480 WARN(1, "TPACKET version not supported.\n");
484 /* one flush is safe, as both fields always lie on the same cacheline */
485 flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
491 static void *packet_lookup_frame(struct packet_sock *po,
492 struct packet_ring_buffer *rb,
493 unsigned int position,
496 unsigned int pg_vec_pos, frame_offset;
497 union tpacket_uhdr h;
499 pg_vec_pos = position / rb->frames_per_block;
500 frame_offset = position % rb->frames_per_block;
502 h.raw = rb->pg_vec[pg_vec_pos].buffer +
503 (frame_offset * rb->frame_size);
505 if (status != __packet_get_status(po, h.raw))
511 static void *packet_current_frame(struct packet_sock *po,
512 struct packet_ring_buffer *rb,
515 return packet_lookup_frame(po, rb, rb->head, status);
518 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
520 del_timer_sync(&pkc->retire_blk_timer);
523 static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
524 struct sk_buff_head *rb_queue)
526 struct tpacket_kbdq_core *pkc;
528 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
530 spin_lock_bh(&rb_queue->lock);
531 pkc->delete_blk_timer = 1;
532 spin_unlock_bh(&rb_queue->lock);
534 prb_del_retire_blk_timer(pkc);
537 static void prb_init_blk_timer(struct packet_sock *po,
538 struct tpacket_kbdq_core *pkc,
539 void (*func) (unsigned long))
541 init_timer(&pkc->retire_blk_timer);
542 pkc->retire_blk_timer.data = (long)po;
543 pkc->retire_blk_timer.function = func;
544 pkc->retire_blk_timer.expires = jiffies;
547 static void prb_setup_retire_blk_timer(struct packet_sock *po)
549 struct tpacket_kbdq_core *pkc;
551 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
552 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
555 static int prb_calc_retire_blk_tmo(struct packet_sock *po,
556 int blk_size_in_bytes)
558 struct net_device *dev;
559 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
560 struct ethtool_cmd ecmd;
565 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
566 if (unlikely(!dev)) {
568 return DEFAULT_PRB_RETIRE_TOV;
570 err = __ethtool_get_settings(dev, &ecmd);
571 speed = ethtool_cmd_speed(&ecmd);
575 * If the link speed is so slow you don't really
576 * need to worry about perf anyways
578 if (speed < SPEED_1000 || speed == SPEED_UNKNOWN) {
579 return DEFAULT_PRB_RETIRE_TOV;
586 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
598 static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
599 union tpacket_req_u *req_u)
601 p1->feature_req_word = req_u->req3.tp_feature_req_word;
604 static void init_prb_bdqc(struct packet_sock *po,
605 struct packet_ring_buffer *rb,
607 union tpacket_req_u *req_u)
609 struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
610 struct tpacket_block_desc *pbd;
612 memset(p1, 0x0, sizeof(*p1));
614 p1->knxt_seq_num = 1;
616 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
617 p1->pkblk_start = pg_vec[0].buffer;
618 p1->kblk_size = req_u->req3.tp_block_size;
619 p1->knum_blocks = req_u->req3.tp_block_nr;
620 p1->hdrlen = po->tp_hdrlen;
621 p1->version = po->tp_version;
622 p1->last_kactive_blk_num = 0;
623 po->stats.stats3.tp_freeze_q_cnt = 0;
624 if (req_u->req3.tp_retire_blk_tov)
625 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
627 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
628 req_u->req3.tp_block_size);
629 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
630 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
632 p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
633 prb_init_ft_ops(p1, req_u);
634 prb_setup_retire_blk_timer(po);
635 prb_open_block(p1, pbd);
638 /* Do NOT update the last_blk_num first.
639 * Assumes sk_buff_head lock is held.
641 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
643 mod_timer(&pkc->retire_blk_timer,
644 jiffies + pkc->tov_in_jiffies);
645 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
650 * 1) We refresh the timer only when we open a block.
651 * By doing this we don't waste cycles refreshing the timer
652 * on packet-by-packet basis.
654 * With a 1MB block-size, on a 1Gbps line, it will take
655 * i) ~8 ms to fill a block + ii) memcpy etc.
656 * In this cut we are not accounting for the memcpy time.
658 * So, if the user sets the 'tmo' to 10ms then the timer
659 * will never fire while the block is still getting filled
660 * (which is what we want). However, the user could choose
661 * to close a block early and that's fine.
663 * But when the timer does fire, we check whether or not to refresh it.
664 * Since the tmo granularity is in msecs, it is not too expensive
665 * to refresh the timer, lets say every '8' msecs.
666 * Either the user can set the 'tmo' or we can derive it based on
667 * a) line-speed and b) block-size.
668 * prb_calc_retire_blk_tmo() calculates the tmo.
671 static void prb_retire_rx_blk_timer_expired(unsigned long data)
673 struct packet_sock *po = (struct packet_sock *)data;
674 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
676 struct tpacket_block_desc *pbd;
678 spin_lock(&po->sk.sk_receive_queue.lock);
680 frozen = prb_queue_frozen(pkc);
681 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
683 if (unlikely(pkc->delete_blk_timer))
686 /* We only need to plug the race when the block is partially filled.
688 * lock(); increment BLOCK_NUM_PKTS; unlock()
689 * copy_bits() is in progress ...
690 * timer fires on other cpu:
691 * we can't retire the current block because copy_bits
695 if (BLOCK_NUM_PKTS(pbd)) {
696 while (atomic_read(&pkc->blk_fill_in_prog)) {
697 /* Waiting for skb_copy_bits to finish... */
702 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
704 if (!BLOCK_NUM_PKTS(pbd)) {
705 /* An empty block. Just refresh the timer. */
708 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
709 if (!prb_dispatch_next_block(pkc, po))
714 /* Case 1. Queue was frozen because user-space was
717 if (prb_curr_blk_in_use(pkc, pbd)) {
719 * Ok, user-space is still behind.
720 * So just refresh the timer.
724 /* Case 2. queue was frozen,user-space caught up,
725 * now the link went idle && the timer fired.
726 * We don't have a block to close.So we open this
727 * block and restart the timer.
728 * opening a block thaws the queue,restarts timer
729 * Thawing/timer-refresh is a side effect.
731 prb_open_block(pkc, pbd);
738 _prb_refresh_rx_retire_blk_timer(pkc);
741 spin_unlock(&po->sk.sk_receive_queue.lock);
744 static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
745 struct tpacket_block_desc *pbd1, __u32 status)
747 /* Flush everything minus the block header */
749 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
754 /* Skip the block header(we know header WILL fit in 4K) */
757 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
758 for (; start < end; start += PAGE_SIZE)
759 flush_dcache_page(pgv_to_page(start));
764 /* Now update the block status. */
766 BLOCK_STATUS(pbd1) = status;
768 /* Flush the block header */
770 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
772 flush_dcache_page(pgv_to_page(start));
782 * 2) Increment active_blk_num
784 * Note:We DONT refresh the timer on purpose.
785 * Because almost always the next block will be opened.
787 static void prb_close_block(struct tpacket_kbdq_core *pkc1,
788 struct tpacket_block_desc *pbd1,
789 struct packet_sock *po, unsigned int stat)
791 __u32 status = TP_STATUS_USER | stat;
793 struct tpacket3_hdr *last_pkt;
794 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
795 struct sock *sk = &po->sk;
797 if (po->stats.stats3.tp_drops)
798 status |= TP_STATUS_LOSING;
800 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
801 last_pkt->tp_next_offset = 0;
803 /* Get the ts of the last pkt */
804 if (BLOCK_NUM_PKTS(pbd1)) {
805 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
806 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
808 /* Ok, we tmo'd - so get the current time.
810 * It shouldn't really happen as we don't close empty
811 * blocks. See prb_retire_rx_blk_timer_expired().
815 h1->ts_last_pkt.ts_sec = ts.tv_sec;
816 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
821 /* Flush the block */
822 prb_flush_block(pkc1, pbd1, status);
824 sk->sk_data_ready(sk);
826 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
829 static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
831 pkc->reset_pending_on_curr_blk = 0;
835 * Side effect of opening a block:
837 * 1) prb_queue is thawed.
838 * 2) retire_blk_timer is refreshed.
841 static void prb_open_block(struct tpacket_kbdq_core *pkc1,
842 struct tpacket_block_desc *pbd1)
845 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
849 /* We could have just memset this but we will lose the
850 * flexibility of making the priv area sticky
853 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
854 BLOCK_NUM_PKTS(pbd1) = 0;
855 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
859 h1->ts_first_pkt.ts_sec = ts.tv_sec;
860 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
862 pkc1->pkblk_start = (char *)pbd1;
863 pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
865 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
866 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
868 pbd1->version = pkc1->version;
869 pkc1->prev = pkc1->nxt_offset;
870 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
872 prb_thaw_queue(pkc1);
873 _prb_refresh_rx_retire_blk_timer(pkc1);
879 * Queue freeze logic:
880 * 1) Assume tp_block_nr = 8 blocks.
881 * 2) At time 't0', user opens Rx ring.
882 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
883 * 4) user-space is either sleeping or processing block '0'.
884 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
885 * it will close block-7,loop around and try to fill block '0'.
887 * __packet_lookup_frame_in_block
888 * prb_retire_current_block()
889 * prb_dispatch_next_block()
890 * |->(BLOCK_STATUS == USER) evaluates to true
891 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
892 * 6) Now there are two cases:
893 * 6.1) Link goes idle right after the queue is frozen.
894 * But remember, the last open_block() refreshed the timer.
895 * When this timer expires,it will refresh itself so that we can
896 * re-open block-0 in near future.
897 * 6.2) Link is busy and keeps on receiving packets. This is a simple
898 * case and __packet_lookup_frame_in_block will check if block-0
899 * is free and can now be re-used.
901 static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
902 struct packet_sock *po)
904 pkc->reset_pending_on_curr_blk = 1;
905 po->stats.stats3.tp_freeze_q_cnt++;
908 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
911 * If the next block is free then we will dispatch it
912 * and return a good offset.
913 * Else, we will freeze the queue.
914 * So, caller must check the return value.
916 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
917 struct packet_sock *po)
919 struct tpacket_block_desc *pbd;
923 /* 1. Get current block num */
924 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
926 /* 2. If this block is currently in_use then freeze the queue */
927 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
928 prb_freeze_queue(pkc, po);
934 * open this block and return the offset where the first packet
935 * needs to get stored.
937 prb_open_block(pkc, pbd);
938 return (void *)pkc->nxt_offset;
941 static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
942 struct packet_sock *po, unsigned int status)
944 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
946 /* retire/close the current block */
947 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
949 * Plug the case where copy_bits() is in progress on
950 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
951 * have space to copy the pkt in the current block and
952 * called prb_retire_current_block()
954 * We don't need to worry about the TMO case because
955 * the timer-handler already handled this case.
957 if (!(status & TP_STATUS_BLK_TMO)) {
958 while (atomic_read(&pkc->blk_fill_in_prog)) {
959 /* Waiting for skb_copy_bits to finish... */
963 prb_close_block(pkc, pbd, po, status);
968 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
969 struct tpacket_block_desc *pbd)
971 return TP_STATUS_USER & BLOCK_STATUS(pbd);
974 static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
976 return pkc->reset_pending_on_curr_blk;
979 static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
981 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
982 atomic_dec(&pkc->blk_fill_in_prog);
985 static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
986 struct tpacket3_hdr *ppd)
988 ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
991 static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
992 struct tpacket3_hdr *ppd)
994 ppd->hv1.tp_rxhash = 0;
997 static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
998 struct tpacket3_hdr *ppd)
1000 if (skb_vlan_tag_present(pkc->skb)) {
1001 ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
1002 ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
1003 ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
1005 ppd->hv1.tp_vlan_tci = 0;
1006 ppd->hv1.tp_vlan_tpid = 0;
1007 ppd->tp_status = TP_STATUS_AVAILABLE;
1011 static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
1012 struct tpacket3_hdr *ppd)
1014 ppd->hv1.tp_padding = 0;
1015 prb_fill_vlan_info(pkc, ppd);
1017 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
1018 prb_fill_rxhash(pkc, ppd);
1020 prb_clear_rxhash(pkc, ppd);
1023 static void prb_fill_curr_block(char *curr,
1024 struct tpacket_kbdq_core *pkc,
1025 struct tpacket_block_desc *pbd,
1028 struct tpacket3_hdr *ppd;
1030 ppd = (struct tpacket3_hdr *)curr;
1031 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1033 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1034 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1035 BLOCK_NUM_PKTS(pbd) += 1;
1036 atomic_inc(&pkc->blk_fill_in_prog);
1037 prb_run_all_ft_ops(pkc, ppd);
1040 /* Assumes caller has the sk->rx_queue.lock */
1041 static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1042 struct sk_buff *skb,
1047 struct tpacket_kbdq_core *pkc;
1048 struct tpacket_block_desc *pbd;
1051 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
1052 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1054 /* Queue is frozen when user space is lagging behind */
1055 if (prb_queue_frozen(pkc)) {
1057 * Check if that last block which caused the queue to freeze,
1058 * is still in_use by user-space.
1060 if (prb_curr_blk_in_use(pkc, pbd)) {
1061 /* Can't record this packet */
1065 * Ok, the block was released by user-space.
1066 * Now let's open that block.
1067 * opening a block also thaws the queue.
1068 * Thawing is a side effect.
1070 prb_open_block(pkc, pbd);
1075 curr = pkc->nxt_offset;
1077 end = (char *)pbd + pkc->kblk_size;
1079 /* first try the current block */
1080 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1081 prb_fill_curr_block(curr, pkc, pbd, len);
1082 return (void *)curr;
1085 /* Ok, close the current block */
1086 prb_retire_current_block(pkc, po, 0);
1088 /* Now, try to dispatch the next block */
1089 curr = (char *)prb_dispatch_next_block(pkc, po);
1091 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1092 prb_fill_curr_block(curr, pkc, pbd, len);
1093 return (void *)curr;
1097 * No free blocks are available.user_space hasn't caught up yet.
1098 * Queue was just frozen and now this packet will get dropped.
1103 static void *packet_current_rx_frame(struct packet_sock *po,
1104 struct sk_buff *skb,
1105 int status, unsigned int len)
1108 switch (po->tp_version) {
1111 curr = packet_lookup_frame(po, &po->rx_ring,
1112 po->rx_ring.head, status);
1115 return __packet_lookup_frame_in_block(po, skb, status, len);
1117 WARN(1, "TPACKET version not supported\n");
1123 static void *prb_lookup_block(struct packet_sock *po,
1124 struct packet_ring_buffer *rb,
1128 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1129 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
1131 if (status != BLOCK_STATUS(pbd))
1136 static int prb_previous_blk_num(struct packet_ring_buffer *rb)
1139 if (rb->prb_bdqc.kactive_blk_num)
1140 prev = rb->prb_bdqc.kactive_blk_num-1;
1142 prev = rb->prb_bdqc.knum_blocks-1;
1146 /* Assumes caller has held the rx_queue.lock */
1147 static void *__prb_previous_block(struct packet_sock *po,
1148 struct packet_ring_buffer *rb,
1151 unsigned int previous = prb_previous_blk_num(rb);
1152 return prb_lookup_block(po, rb, previous, status);
1155 static void *packet_previous_rx_frame(struct packet_sock *po,
1156 struct packet_ring_buffer *rb,
1159 if (po->tp_version <= TPACKET_V2)
1160 return packet_previous_frame(po, rb, status);
1162 return __prb_previous_block(po, rb, status);
1165 static void packet_increment_rx_head(struct packet_sock *po,
1166 struct packet_ring_buffer *rb)
1168 switch (po->tp_version) {
1171 return packet_increment_head(rb);
1174 WARN(1, "TPACKET version not supported.\n");
1180 static void *packet_previous_frame(struct packet_sock *po,
1181 struct packet_ring_buffer *rb,
1184 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1185 return packet_lookup_frame(po, rb, previous, status);
1188 static void packet_increment_head(struct packet_ring_buffer *buff)
1190 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1193 static void packet_inc_pending(struct packet_ring_buffer *rb)
1195 this_cpu_inc(*rb->pending_refcnt);
1198 static void packet_dec_pending(struct packet_ring_buffer *rb)
1200 this_cpu_dec(*rb->pending_refcnt);
1203 static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
1205 unsigned int refcnt = 0;
1208 /* We don't use pending refcount in rx_ring. */
1209 if (rb->pending_refcnt == NULL)
1212 for_each_possible_cpu(cpu)
1213 refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
1218 static int packet_alloc_pending(struct packet_sock *po)
1220 po->rx_ring.pending_refcnt = NULL;
1222 po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
1223 if (unlikely(po->tx_ring.pending_refcnt == NULL))
1229 static void packet_free_pending(struct packet_sock *po)
1231 free_percpu(po->tx_ring.pending_refcnt);
1234 #define ROOM_POW_OFF 2
1235 #define ROOM_NONE 0x0
1236 #define ROOM_LOW 0x1
1237 #define ROOM_NORMAL 0x2
1239 static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
1243 len = po->rx_ring.frame_max + 1;
1244 idx = po->rx_ring.head;
1246 idx += len >> pow_off;
1249 return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1252 static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
1256 len = po->rx_ring.prb_bdqc.knum_blocks;
1257 idx = po->rx_ring.prb_bdqc.kactive_blk_num;
1259 idx += len >> pow_off;
1262 return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1265 static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1267 struct sock *sk = &po->sk;
1268 int ret = ROOM_NONE;
1270 if (po->prot_hook.func != tpacket_rcv) {
1271 int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
1272 - (skb ? skb->truesize : 0);
1273 if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
1281 if (po->tp_version == TPACKET_V3) {
1282 if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
1284 else if (__tpacket_v3_has_room(po, 0))
1287 if (__tpacket_has_room(po, ROOM_POW_OFF))
1289 else if (__tpacket_has_room(po, 0))
1296 static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1301 spin_lock_bh(&po->sk.sk_receive_queue.lock);
1302 ret = __packet_rcv_has_room(po, skb);
1303 has_room = ret == ROOM_NORMAL;
1304 if (po->pressure == has_room)
1305 po->pressure = !has_room;
1306 spin_unlock_bh(&po->sk.sk_receive_queue.lock);
1311 static void packet_sock_destruct(struct sock *sk)
1313 skb_queue_purge(&sk->sk_error_queue);
1315 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1316 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1318 if (!sock_flag(sk, SOCK_DEAD)) {
1319 pr_err("Attempt to release alive packet socket: %p\n", sk);
1323 sk_refcnt_debug_dec(sk);
1326 static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
1331 rxhash = skb_get_hash(skb);
1332 for (i = 0; i < ROLLOVER_HLEN; i++)
1333 if (po->rollover->history[i] == rxhash)
1336 po->rollover->history[prandom_u32() % ROLLOVER_HLEN] = rxhash;
1337 return count > (ROLLOVER_HLEN >> 1);
1340 static unsigned int fanout_demux_hash(struct packet_fanout *f,
1341 struct sk_buff *skb,
1344 return reciprocal_scale(skb_get_hash(skb), num);
1347 static unsigned int fanout_demux_lb(struct packet_fanout *f,
1348 struct sk_buff *skb,
1351 unsigned int val = atomic_inc_return(&f->rr_cur);
1356 static unsigned int fanout_demux_cpu(struct packet_fanout *f,
1357 struct sk_buff *skb,
1360 return smp_processor_id() % num;
1363 static unsigned int fanout_demux_rnd(struct packet_fanout *f,
1364 struct sk_buff *skb,
1367 return prandom_u32_max(num);
1370 static unsigned int fanout_demux_rollover(struct packet_fanout *f,
1371 struct sk_buff *skb,
1372 unsigned int idx, bool try_self,
1375 struct packet_sock *po, *po_next, *po_skip = NULL;
1376 unsigned int i, j, room = ROOM_NONE;
1378 po = pkt_sk(f->arr[idx]);
1381 room = packet_rcv_has_room(po, skb);
1382 if (room == ROOM_NORMAL ||
1383 (room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
1388 i = j = min_t(int, po->rollover->sock, num - 1);
1390 po_next = pkt_sk(f->arr[i]);
1391 if (po_next != po_skip && !po_next->pressure &&
1392 packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
1394 po->rollover->sock = i;
1395 atomic_long_inc(&po->rollover->num);
1396 if (room == ROOM_LOW)
1397 atomic_long_inc(&po->rollover->num_huge);
1405 atomic_long_inc(&po->rollover->num_failed);
1409 static unsigned int fanout_demux_qm(struct packet_fanout *f,
1410 struct sk_buff *skb,
1413 return skb_get_queue_mapping(skb) % num;
1416 static unsigned int fanout_demux_bpf(struct packet_fanout *f,
1417 struct sk_buff *skb,
1420 struct bpf_prog *prog;
1421 unsigned int ret = 0;
1424 prog = rcu_dereference(f->bpf_prog);
1426 ret = bpf_prog_run_clear_cb(prog, skb) % num;
1432 static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
1434 return f->flags & (flag >> 8);
1437 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1438 struct packet_type *pt, struct net_device *orig_dev)
1440 struct packet_fanout *f = pt->af_packet_priv;
1441 unsigned int num = READ_ONCE(f->num_members);
1442 struct net *net = read_pnet(&f->net);
1443 struct packet_sock *po;
1446 if (!net_eq(dev_net(dev), net) || !num) {
1451 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
1452 skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET);
1457 case PACKET_FANOUT_HASH:
1459 idx = fanout_demux_hash(f, skb, num);
1461 case PACKET_FANOUT_LB:
1462 idx = fanout_demux_lb(f, skb, num);
1464 case PACKET_FANOUT_CPU:
1465 idx = fanout_demux_cpu(f, skb, num);
1467 case PACKET_FANOUT_RND:
1468 idx = fanout_demux_rnd(f, skb, num);
1470 case PACKET_FANOUT_QM:
1471 idx = fanout_demux_qm(f, skb, num);
1473 case PACKET_FANOUT_ROLLOVER:
1474 idx = fanout_demux_rollover(f, skb, 0, false, num);
1476 case PACKET_FANOUT_CBPF:
1477 case PACKET_FANOUT_EBPF:
1478 idx = fanout_demux_bpf(f, skb, num);
1482 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
1483 idx = fanout_demux_rollover(f, skb, idx, true, num);
1485 po = pkt_sk(f->arr[idx]);
1486 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1489 DEFINE_MUTEX(fanout_mutex);
1490 EXPORT_SYMBOL_GPL(fanout_mutex);
1491 static LIST_HEAD(fanout_list);
1493 static void __fanout_link(struct sock *sk, struct packet_sock *po)
1495 struct packet_fanout *f = po->fanout;
1497 spin_lock(&f->lock);
1498 f->arr[f->num_members] = sk;
1501 spin_unlock(&f->lock);
1504 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1506 struct packet_fanout *f = po->fanout;
1509 spin_lock(&f->lock);
1510 for (i = 0; i < f->num_members; i++) {
1511 if (f->arr[i] == sk)
1514 BUG_ON(i >= f->num_members);
1515 f->arr[i] = f->arr[f->num_members - 1];
1517 spin_unlock(&f->lock);
1520 static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
1522 if (sk->sk_family != PF_PACKET)
1525 return ptype->af_packet_priv == pkt_sk(sk)->fanout;
1528 static void fanout_init_data(struct packet_fanout *f)
1531 case PACKET_FANOUT_LB:
1532 atomic_set(&f->rr_cur, 0);
1534 case PACKET_FANOUT_CBPF:
1535 case PACKET_FANOUT_EBPF:
1536 RCU_INIT_POINTER(f->bpf_prog, NULL);
1541 static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
1543 struct bpf_prog *old;
1545 spin_lock(&f->lock);
1546 old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
1547 rcu_assign_pointer(f->bpf_prog, new);
1548 spin_unlock(&f->lock);
1552 bpf_prog_destroy(old);
1556 static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
1559 struct bpf_prog *new;
1560 struct sock_fprog fprog;
1563 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1565 if (len != sizeof(fprog))
1567 if (copy_from_user(&fprog, data, len))
1570 ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
1574 __fanout_set_data_bpf(po->fanout, new);
1578 static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
1581 struct bpf_prog *new;
1584 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1586 if (len != sizeof(fd))
1588 if (copy_from_user(&fd, data, len))
1591 new = bpf_prog_get(fd);
1593 return PTR_ERR(new);
1594 if (new->type != BPF_PROG_TYPE_SOCKET_FILTER) {
1599 __fanout_set_data_bpf(po->fanout, new);
1603 static int fanout_set_data(struct packet_sock *po, char __user *data,
1606 switch (po->fanout->type) {
1607 case PACKET_FANOUT_CBPF:
1608 return fanout_set_data_cbpf(po, data, len);
1609 case PACKET_FANOUT_EBPF:
1610 return fanout_set_data_ebpf(po, data, len);
1616 static void fanout_release_data(struct packet_fanout *f)
1619 case PACKET_FANOUT_CBPF:
1620 case PACKET_FANOUT_EBPF:
1621 __fanout_set_data_bpf(f, NULL);
1625 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
1627 struct packet_sock *po = pkt_sk(sk);
1628 struct packet_fanout *f, *match;
1629 u8 type = type_flags & 0xff;
1630 u8 flags = type_flags >> 8;
1634 case PACKET_FANOUT_ROLLOVER:
1635 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1637 case PACKET_FANOUT_HASH:
1638 case PACKET_FANOUT_LB:
1639 case PACKET_FANOUT_CPU:
1640 case PACKET_FANOUT_RND:
1641 case PACKET_FANOUT_QM:
1642 case PACKET_FANOUT_CBPF:
1643 case PACKET_FANOUT_EBPF:
1655 if (type == PACKET_FANOUT_ROLLOVER ||
1656 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1657 po->rollover = kzalloc(sizeof(*po->rollover), GFP_KERNEL);
1660 atomic_long_set(&po->rollover->num, 0);
1661 atomic_long_set(&po->rollover->num_huge, 0);
1662 atomic_long_set(&po->rollover->num_failed, 0);
1665 mutex_lock(&fanout_mutex);
1667 list_for_each_entry(f, &fanout_list, list) {
1669 read_pnet(&f->net) == sock_net(sk)) {
1675 if (match && match->flags != flags)
1679 match = kzalloc(sizeof(*match), GFP_KERNEL);
1682 write_pnet(&match->net, sock_net(sk));
1685 match->flags = flags;
1686 INIT_LIST_HEAD(&match->list);
1687 spin_lock_init(&match->lock);
1688 atomic_set(&match->sk_ref, 0);
1689 fanout_init_data(match);
1690 match->prot_hook.type = po->prot_hook.type;
1691 match->prot_hook.dev = po->prot_hook.dev;
1692 match->prot_hook.func = packet_rcv_fanout;
1693 match->prot_hook.af_packet_priv = match;
1694 match->prot_hook.id_match = match_fanout_group;
1695 dev_add_pack(&match->prot_hook);
1696 list_add(&match->list, &fanout_list);
1699 if (match->type == type &&
1700 match->prot_hook.type == po->prot_hook.type &&
1701 match->prot_hook.dev == po->prot_hook.dev) {
1703 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1704 __dev_remove_pack(&po->prot_hook);
1706 atomic_inc(&match->sk_ref);
1707 __fanout_link(sk, po);
1712 mutex_unlock(&fanout_mutex);
1714 kfree(po->rollover);
1715 po->rollover = NULL;
1720 static void fanout_release(struct sock *sk)
1722 struct packet_sock *po = pkt_sk(sk);
1723 struct packet_fanout *f;
1729 mutex_lock(&fanout_mutex);
1732 if (atomic_dec_and_test(&f->sk_ref)) {
1734 dev_remove_pack(&f->prot_hook);
1735 fanout_release_data(f);
1738 mutex_unlock(&fanout_mutex);
1741 kfree_rcu(po->rollover, rcu);
1744 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1745 struct sk_buff *skb)
1747 /* Earlier code assumed this would be a VLAN pkt, double-check
1748 * this now that we have the actual packet in hand. We can only
1749 * do this check on Ethernet devices.
1751 if (unlikely(dev->type != ARPHRD_ETHER))
1754 skb_reset_mac_header(skb);
1755 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1758 static const struct proto_ops packet_ops;
1760 static const struct proto_ops packet_ops_spkt;
1762 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1763 struct packet_type *pt, struct net_device *orig_dev)
1766 struct sockaddr_pkt *spkt;
1769 * When we registered the protocol we saved the socket in the data
1770 * field for just this event.
1773 sk = pt->af_packet_priv;
1776 * Yank back the headers [hope the device set this
1777 * right or kerboom...]
1779 * Incoming packets have ll header pulled,
1782 * For outgoing ones skb->data == skb_mac_header(skb)
1783 * so that this procedure is noop.
1786 if (skb->pkt_type == PACKET_LOOPBACK)
1789 if (!net_eq(dev_net(dev), sock_net(sk)))
1792 skb = skb_share_check(skb, GFP_ATOMIC);
1796 /* drop any routing info */
1799 /* drop conntrack reference */
1802 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1804 skb_push(skb, skb->data - skb_mac_header(skb));
1807 * The SOCK_PACKET socket receives _all_ frames.
1810 spkt->spkt_family = dev->type;
1811 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1812 spkt->spkt_protocol = skb->protocol;
1815 * Charge the memory to the socket. This is done specifically
1816 * to prevent sockets using all the memory up.
1819 if (sock_queue_rcv_skb(sk, skb) == 0)
1830 * Output a raw packet to a device layer. This bypasses all the other
1831 * protocol layers and you must therefore supply it with a complete frame
1834 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1837 struct sock *sk = sock->sk;
1838 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1839 struct sk_buff *skb = NULL;
1840 struct net_device *dev;
1846 * Get and verify the address.
1850 if (msg->msg_namelen < sizeof(struct sockaddr))
1852 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1853 proto = saddr->spkt_protocol;
1855 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1858 * Find the device first to size check it
1861 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1864 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1870 if (!(dev->flags & IFF_UP))
1874 * You may not queue a frame bigger than the mtu. This is the lowest level
1875 * raw protocol and you must do your own fragmentation at this level.
1878 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1879 if (!netif_supports_nofcs(dev)) {
1880 err = -EPROTONOSUPPORT;
1883 extra_len = 4; /* We're doing our own CRC */
1887 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1891 size_t reserved = LL_RESERVED_SPACE(dev);
1892 int tlen = dev->needed_tailroom;
1893 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1896 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1899 /* FIXME: Save some space for broken drivers that write a hard
1900 * header at transmission time by themselves. PPP is the notable
1901 * one here. This should really be fixed at the driver level.
1903 skb_reserve(skb, reserved);
1904 skb_reset_network_header(skb);
1906 /* Try to align data part correctly */
1911 skb_reset_network_header(skb);
1913 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1919 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1920 !packet_extra_vlan_len_allowed(dev, skb)) {
1925 skb->protocol = proto;
1927 skb->priority = sk->sk_priority;
1928 skb->mark = sk->sk_mark;
1930 sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1932 if (unlikely(extra_len == 4))
1935 skb_probe_transport_header(skb, 0);
1937 dev_queue_xmit(skb);
1948 static unsigned int run_filter(struct sk_buff *skb,
1949 const struct sock *sk,
1952 struct sk_filter *filter;
1955 filter = rcu_dereference(sk->sk_filter);
1957 res = bpf_prog_run_clear_cb(filter->prog, skb);
1963 static int __packet_rcv_vnet(const struct sk_buff *skb,
1964 struct virtio_net_hdr *vnet_hdr)
1966 *vnet_hdr = (const struct virtio_net_hdr) { 0 };
1968 if (skb_is_gso(skb)) {
1969 struct skb_shared_info *sinfo = skb_shinfo(skb);
1971 /* This is a hint as to how much should be linear. */
1973 __cpu_to_virtio16(vio_le(), skb_headlen(skb));
1974 vnet_hdr->gso_size =
1975 __cpu_to_virtio16(vio_le(), sinfo->gso_size);
1977 if (sinfo->gso_type & SKB_GSO_TCPV4)
1978 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
1979 else if (sinfo->gso_type & SKB_GSO_TCPV6)
1980 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
1981 else if (sinfo->gso_type & SKB_GSO_UDP)
1982 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
1983 else if (sinfo->gso_type & SKB_GSO_FCOE)
1988 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
1989 vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
1991 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
1993 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1994 vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
1995 vnet_hdr->csum_start = __cpu_to_virtio16(vio_le(),
1996 skb_checksum_start_offset(skb));
1997 vnet_hdr->csum_offset = __cpu_to_virtio16(vio_le(),
1999 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
2000 vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
2001 } /* else everything is zero */
2006 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
2009 struct virtio_net_hdr vnet_hdr;
2011 if (*len < sizeof(vnet_hdr))
2013 *len -= sizeof(vnet_hdr);
2015 if (__packet_rcv_vnet(skb, &vnet_hdr))
2018 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
2022 * This function makes lazy skb cloning in hope that most of packets
2023 * are discarded by BPF.
2025 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2026 * and skb->cb are mangled. It works because (and until) packets
2027 * falling here are owned by current CPU. Output packets are cloned
2028 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2029 * sequencially, so that if we return skb to original state on exit,
2030 * we will not harm anyone.
2033 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2034 struct packet_type *pt, struct net_device *orig_dev)
2037 struct sockaddr_ll *sll;
2038 struct packet_sock *po;
2039 u8 *skb_head = skb->data;
2040 int skb_len = skb->len;
2041 unsigned int snaplen, res;
2043 if (skb->pkt_type == PACKET_LOOPBACK)
2046 sk = pt->af_packet_priv;
2049 if (!net_eq(dev_net(dev), sock_net(sk)))
2054 if (dev->header_ops) {
2055 /* The device has an explicit notion of ll header,
2056 * exported to higher levels.
2058 * Otherwise, the device hides details of its frame
2059 * structure, so that corresponding packet head is
2060 * never delivered to user.
2062 if (sk->sk_type != SOCK_DGRAM)
2063 skb_push(skb, skb->data - skb_mac_header(skb));
2064 else if (skb->pkt_type == PACKET_OUTGOING) {
2065 /* Special case: outgoing packets have ll header at head */
2066 skb_pull(skb, skb_network_offset(skb));
2072 res = run_filter(skb, sk, snaplen);
2074 goto drop_n_restore;
2078 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2081 if (skb_shared(skb)) {
2082 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2086 if (skb_head != skb->data) {
2087 skb->data = skb_head;
2094 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2096 sll = &PACKET_SKB_CB(skb)->sa.ll;
2097 sll->sll_hatype = dev->type;
2098 sll->sll_pkttype = skb->pkt_type;
2099 if (unlikely(po->origdev))
2100 sll->sll_ifindex = orig_dev->ifindex;
2102 sll->sll_ifindex = dev->ifindex;
2104 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2106 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2107 * Use their space for storing the original skb length.
2109 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2111 if (pskb_trim(skb, snaplen))
2114 skb_set_owner_r(skb, sk);
2118 /* drop conntrack reference */
2121 spin_lock(&sk->sk_receive_queue.lock);
2122 po->stats.stats1.tp_packets++;
2123 sock_skb_set_dropcount(sk, skb);
2124 __skb_queue_tail(&sk->sk_receive_queue, skb);
2125 spin_unlock(&sk->sk_receive_queue.lock);
2126 sk->sk_data_ready(sk);
2130 spin_lock(&sk->sk_receive_queue.lock);
2131 po->stats.stats1.tp_drops++;
2132 atomic_inc(&sk->sk_drops);
2133 spin_unlock(&sk->sk_receive_queue.lock);
2136 if (skb_head != skb->data && skb_shared(skb)) {
2137 skb->data = skb_head;
2145 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2146 struct packet_type *pt, struct net_device *orig_dev)
2149 struct packet_sock *po;
2150 struct sockaddr_ll *sll;
2151 union tpacket_uhdr h;
2152 u8 *skb_head = skb->data;
2153 int skb_len = skb->len;
2154 unsigned int snaplen, res;
2155 unsigned long status = TP_STATUS_USER;
2156 unsigned short macoff, netoff, hdrlen;
2157 struct sk_buff *copy_skb = NULL;
2161 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2162 * We may add members to them until current aligned size without forcing
2163 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2165 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2166 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2168 if (skb->pkt_type == PACKET_LOOPBACK)
2171 sk = pt->af_packet_priv;
2174 if (!net_eq(dev_net(dev), sock_net(sk)))
2177 if (dev->header_ops) {
2178 if (sk->sk_type != SOCK_DGRAM)
2179 skb_push(skb, skb->data - skb_mac_header(skb));
2180 else if (skb->pkt_type == PACKET_OUTGOING) {
2181 /* Special case: outgoing packets have ll header at head */
2182 skb_pull(skb, skb_network_offset(skb));
2188 res = run_filter(skb, sk, snaplen);
2190 goto drop_n_restore;
2192 if (skb->ip_summed == CHECKSUM_PARTIAL)
2193 status |= TP_STATUS_CSUMNOTREADY;
2194 else if (skb->pkt_type != PACKET_OUTGOING &&
2195 (skb->ip_summed == CHECKSUM_COMPLETE ||
2196 skb_csum_unnecessary(skb)))
2197 status |= TP_STATUS_CSUM_VALID;
2202 if (sk->sk_type == SOCK_DGRAM) {
2203 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2206 unsigned int maclen = skb_network_offset(skb);
2207 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2208 (maclen < 16 ? 16 : maclen)) +
2210 if (po->has_vnet_hdr)
2211 netoff += sizeof(struct virtio_net_hdr);
2212 macoff = netoff - maclen;
2214 if (po->tp_version <= TPACKET_V2) {
2215 if (macoff + snaplen > po->rx_ring.frame_size) {
2216 if (po->copy_thresh &&
2217 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2218 if (skb_shared(skb)) {
2219 copy_skb = skb_clone(skb, GFP_ATOMIC);
2221 copy_skb = skb_get(skb);
2222 skb_head = skb->data;
2225 skb_set_owner_r(copy_skb, sk);
2227 snaplen = po->rx_ring.frame_size - macoff;
2228 if ((int)snaplen < 0)
2231 } else if (unlikely(macoff + snaplen >
2232 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2235 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2236 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2237 snaplen, nval, macoff);
2239 if (unlikely((int)snaplen < 0)) {
2241 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2244 spin_lock(&sk->sk_receive_queue.lock);
2245 h.raw = packet_current_rx_frame(po, skb,
2246 TP_STATUS_KERNEL, (macoff+snaplen));
2248 goto drop_n_account;
2249 if (po->tp_version <= TPACKET_V2) {
2250 packet_increment_rx_head(po, &po->rx_ring);
2252 * LOSING will be reported till you read the stats,
2253 * because it's COR - Clear On Read.
2254 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2257 if (po->stats.stats1.tp_drops)
2258 status |= TP_STATUS_LOSING;
2260 po->stats.stats1.tp_packets++;
2262 status |= TP_STATUS_COPY;
2263 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2265 spin_unlock(&sk->sk_receive_queue.lock);
2267 if (po->has_vnet_hdr) {
2268 if (__packet_rcv_vnet(skb, h.raw + macoff -
2269 sizeof(struct virtio_net_hdr))) {
2270 spin_lock(&sk->sk_receive_queue.lock);
2271 goto drop_n_account;
2275 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2277 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2278 getnstimeofday(&ts);
2280 status |= ts_status;
2282 switch (po->tp_version) {
2284 h.h1->tp_len = skb->len;
2285 h.h1->tp_snaplen = snaplen;
2286 h.h1->tp_mac = macoff;
2287 h.h1->tp_net = netoff;
2288 h.h1->tp_sec = ts.tv_sec;
2289 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2290 hdrlen = sizeof(*h.h1);
2293 h.h2->tp_len = skb->len;
2294 h.h2->tp_snaplen = snaplen;
2295 h.h2->tp_mac = macoff;
2296 h.h2->tp_net = netoff;
2297 h.h2->tp_sec = ts.tv_sec;
2298 h.h2->tp_nsec = ts.tv_nsec;
2299 if (skb_vlan_tag_present(skb)) {
2300 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2301 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2302 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2304 h.h2->tp_vlan_tci = 0;
2305 h.h2->tp_vlan_tpid = 0;
2307 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2308 hdrlen = sizeof(*h.h2);
2311 /* tp_nxt_offset,vlan are already populated above.
2312 * So DONT clear those fields here
2314 h.h3->tp_status |= status;
2315 h.h3->tp_len = skb->len;
2316 h.h3->tp_snaplen = snaplen;
2317 h.h3->tp_mac = macoff;
2318 h.h3->tp_net = netoff;
2319 h.h3->tp_sec = ts.tv_sec;
2320 h.h3->tp_nsec = ts.tv_nsec;
2321 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2322 hdrlen = sizeof(*h.h3);
2328 sll = h.raw + TPACKET_ALIGN(hdrlen);
2329 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2330 sll->sll_family = AF_PACKET;
2331 sll->sll_hatype = dev->type;
2332 sll->sll_protocol = skb->protocol;
2333 sll->sll_pkttype = skb->pkt_type;
2334 if (unlikely(po->origdev))
2335 sll->sll_ifindex = orig_dev->ifindex;
2337 sll->sll_ifindex = dev->ifindex;
2341 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2342 if (po->tp_version <= TPACKET_V2) {
2345 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2348 for (start = h.raw; start < end; start += PAGE_SIZE)
2349 flush_dcache_page(pgv_to_page(start));
2354 if (po->tp_version <= TPACKET_V2) {
2355 __packet_set_status(po, h.raw, status);
2356 sk->sk_data_ready(sk);
2358 prb_clear_blk_fill_status(&po->rx_ring);
2362 if (skb_head != skb->data && skb_shared(skb)) {
2363 skb->data = skb_head;
2371 po->stats.stats1.tp_drops++;
2372 spin_unlock(&sk->sk_receive_queue.lock);
2374 sk->sk_data_ready(sk);
2375 kfree_skb(copy_skb);
2376 goto drop_n_restore;
2379 static void tpacket_destruct_skb(struct sk_buff *skb)
2381 struct packet_sock *po = pkt_sk(skb->sk);
2383 if (likely(po->tx_ring.pg_vec)) {
2387 ph = skb_shinfo(skb)->destructor_arg;
2388 packet_dec_pending(&po->tx_ring);
2390 ts = __packet_set_timestamp(po, ph, skb);
2391 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2397 static bool ll_header_truncated(const struct net_device *dev, int len)
2399 /* net device doesn't like empty head */
2400 if (unlikely(len < dev->hard_header_len)) {
2401 net_warn_ratelimited("%s: packet size is too short (%d < %d)\n",
2402 current->comm, len, dev->hard_header_len);
2409 static void tpacket_set_protocol(const struct net_device *dev,
2410 struct sk_buff *skb)
2412 if (dev->type == ARPHRD_ETHER) {
2413 skb_reset_mac_header(skb);
2414 skb->protocol = eth_hdr(skb)->h_proto;
2418 static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2420 unsigned short gso_type = 0;
2422 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2423 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2424 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2425 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2426 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2427 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2428 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2430 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2433 if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2434 switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2435 case VIRTIO_NET_HDR_GSO_TCPV4:
2436 gso_type = SKB_GSO_TCPV4;
2438 case VIRTIO_NET_HDR_GSO_TCPV6:
2439 gso_type = SKB_GSO_TCPV6;
2441 case VIRTIO_NET_HDR_GSO_UDP:
2442 gso_type = SKB_GSO_UDP;
2448 if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
2449 gso_type |= SKB_GSO_TCP_ECN;
2451 if (vnet_hdr->gso_size == 0)
2455 vnet_hdr->gso_type = gso_type; /* changes type, temporary storage */
2459 static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2460 struct virtio_net_hdr *vnet_hdr)
2464 if (*len < sizeof(*vnet_hdr))
2466 *len -= sizeof(*vnet_hdr);
2468 n = copy_from_iter(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter);
2469 if (n != sizeof(*vnet_hdr))
2472 return __packet_snd_vnet_parse(vnet_hdr, *len);
2475 static int packet_snd_vnet_gso(struct sk_buff *skb,
2476 struct virtio_net_hdr *vnet_hdr)
2478 if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2479 u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start);
2480 u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset);
2482 if (!skb_partial_csum_set(skb, s, o))
2486 skb_shinfo(skb)->gso_size =
2487 __virtio16_to_cpu(vio_le(), vnet_hdr->gso_size);
2488 skb_shinfo(skb)->gso_type = vnet_hdr->gso_type;
2490 /* Header must be checked, and gso_segs computed. */
2491 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2492 skb_shinfo(skb)->gso_segs = 0;
2496 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2497 void *frame, struct net_device *dev, void *data, int tp_len,
2498 __be16 proto, unsigned char *addr, int hlen, int copylen)
2500 union tpacket_uhdr ph;
2501 int to_write, offset, len, nr_frags, len_max;
2502 struct socket *sock = po->sk.sk_socket;
2508 skb->protocol = proto;
2510 skb->priority = po->sk.sk_priority;
2511 skb->mark = po->sk.sk_mark;
2512 sock_tx_timestamp(&po->sk, &skb_shinfo(skb)->tx_flags);
2513 skb_shinfo(skb)->destructor_arg = ph.raw;
2515 skb_reserve(skb, hlen);
2516 skb_reset_network_header(skb);
2520 if (sock->type == SOCK_DGRAM) {
2521 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2523 if (unlikely(err < 0))
2525 } else if (copylen) {
2526 skb_push(skb, dev->hard_header_len);
2527 skb_put(skb, copylen - dev->hard_header_len);
2528 err = skb_store_bits(skb, 0, data, copylen);
2532 tpacket_set_protocol(dev, skb);
2535 to_write -= copylen;
2538 offset = offset_in_page(data);
2539 len_max = PAGE_SIZE - offset;
2540 len = ((to_write > len_max) ? len_max : to_write);
2542 skb->data_len = to_write;
2543 skb->len += to_write;
2544 skb->truesize += to_write;
2545 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2547 while (likely(to_write)) {
2548 nr_frags = skb_shinfo(skb)->nr_frags;
2550 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2551 pr_err("Packet exceed the number of skb frags(%lu)\n",
2556 page = pgv_to_page(data);
2558 flush_dcache_page(page);
2560 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2563 len_max = PAGE_SIZE;
2564 len = ((to_write > len_max) ? len_max : to_write);
2567 skb_probe_transport_header(skb, 0);
2572 static int tpacket_parse_header(struct packet_sock *po, void *frame,
2573 int size_max, void **data)
2575 union tpacket_uhdr ph;
2580 switch (po->tp_version) {
2582 tp_len = ph.h2->tp_len;
2585 tp_len = ph.h1->tp_len;
2588 if (unlikely(tp_len > size_max)) {
2589 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2593 if (unlikely(po->tp_tx_has_off)) {
2594 int off_min, off_max;
2596 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2597 off_max = po->tx_ring.frame_size - tp_len;
2598 if (po->sk.sk_type == SOCK_DGRAM) {
2599 switch (po->tp_version) {
2601 off = ph.h2->tp_net;
2604 off = ph.h1->tp_net;
2608 switch (po->tp_version) {
2610 off = ph.h2->tp_mac;
2613 off = ph.h1->tp_mac;
2617 if (unlikely((off < off_min) || (off_max < off)))
2620 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2623 *data = frame + off;
2627 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2629 struct sk_buff *skb;
2630 struct net_device *dev;
2631 struct virtio_net_hdr *vnet_hdr = NULL;
2633 int err, reserve = 0;
2635 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2636 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2637 int tp_len, size_max;
2638 unsigned char *addr;
2641 int status = TP_STATUS_AVAILABLE;
2642 int hlen, tlen, copylen = 0;
2644 mutex_lock(&po->pg_vec_lock);
2646 if (likely(saddr == NULL)) {
2647 dev = packet_cached_dev_get(po);
2652 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2654 if (msg->msg_namelen < (saddr->sll_halen
2655 + offsetof(struct sockaddr_ll,
2658 proto = saddr->sll_protocol;
2659 addr = saddr->sll_addr;
2660 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2664 if (unlikely(dev == NULL))
2667 if (unlikely(!(dev->flags & IFF_UP)))
2670 if (po->sk.sk_socket->type == SOCK_RAW)
2671 reserve = dev->hard_header_len;
2672 size_max = po->tx_ring.frame_size
2673 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2675 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
2676 size_max = dev->mtu + reserve + VLAN_HLEN;
2679 ph = packet_current_frame(po, &po->tx_ring,
2680 TP_STATUS_SEND_REQUEST);
2681 if (unlikely(ph == NULL)) {
2682 if (need_wait && need_resched())
2688 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2692 status = TP_STATUS_SEND_REQUEST;
2693 hlen = LL_RESERVED_SPACE(dev);
2694 tlen = dev->needed_tailroom;
2695 if (po->has_vnet_hdr) {
2697 data += sizeof(*vnet_hdr);
2698 tp_len -= sizeof(*vnet_hdr);
2700 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2704 copylen = __virtio16_to_cpu(vio_le(),
2707 if (dev->hard_header_len) {
2708 if (ll_header_truncated(dev, tp_len)) {
2712 copylen = max_t(int, copylen, dev->hard_header_len);
2714 skb = sock_alloc_send_skb(&po->sk,
2715 hlen + tlen + sizeof(struct sockaddr_ll) +
2716 (copylen - dev->hard_header_len),
2719 if (unlikely(skb == NULL)) {
2720 /* we assume the socket was initially writeable ... */
2721 if (likely(len_sum > 0))
2725 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
2726 addr, hlen, copylen);
2727 if (likely(tp_len >= 0) &&
2728 tp_len > dev->mtu + reserve &&
2729 !po->has_vnet_hdr &&
2730 !packet_extra_vlan_len_allowed(dev, skb))
2733 if (unlikely(tp_len < 0)) {
2736 __packet_set_status(po, ph,
2737 TP_STATUS_AVAILABLE);
2738 packet_increment_head(&po->tx_ring);
2742 status = TP_STATUS_WRONG_FORMAT;
2748 if (po->has_vnet_hdr && packet_snd_vnet_gso(skb, vnet_hdr)) {
2753 packet_pick_tx_queue(dev, skb);
2755 skb->destructor = tpacket_destruct_skb;
2756 __packet_set_status(po, ph, TP_STATUS_SENDING);
2757 packet_inc_pending(&po->tx_ring);
2759 status = TP_STATUS_SEND_REQUEST;
2760 err = po->xmit(skb);
2761 if (unlikely(err > 0)) {
2762 err = net_xmit_errno(err);
2763 if (err && __packet_get_status(po, ph) ==
2764 TP_STATUS_AVAILABLE) {
2765 /* skb was destructed already */
2770 * skb was dropped but not destructed yet;
2771 * let's treat it like congestion or err < 0
2775 packet_increment_head(&po->tx_ring);
2777 } while (likely((ph != NULL) ||
2778 /* Note: packet_read_pending() might be slow if we have
2779 * to call it as it's per_cpu variable, but in fast-path
2780 * we already short-circuit the loop with the first
2781 * condition, and luckily don't have to go that path
2784 (need_wait && packet_read_pending(&po->tx_ring))));
2790 __packet_set_status(po, ph, status);
2795 mutex_unlock(&po->pg_vec_lock);
2799 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2800 size_t reserve, size_t len,
2801 size_t linear, int noblock,
2804 struct sk_buff *skb;
2806 /* Under a page? Don't bother with paged skb. */
2807 if (prepad + len < PAGE_SIZE || !linear)
2810 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2815 skb_reserve(skb, reserve);
2816 skb_put(skb, linear);
2817 skb->data_len = len - linear;
2818 skb->len += len - linear;
2823 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2825 struct sock *sk = sock->sk;
2826 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2827 struct sk_buff *skb;
2828 struct net_device *dev;
2830 unsigned char *addr;
2831 int err, reserve = 0;
2832 struct sockcm_cookie sockc;
2833 struct virtio_net_hdr vnet_hdr = { 0 };
2835 struct packet_sock *po = pkt_sk(sk);
2840 * Get and verify the address.
2843 if (likely(saddr == NULL)) {
2844 dev = packet_cached_dev_get(po);
2849 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2851 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2853 proto = saddr->sll_protocol;
2854 addr = saddr->sll_addr;
2855 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2859 if (unlikely(dev == NULL))
2862 if (unlikely(!(dev->flags & IFF_UP)))
2865 sockc.mark = sk->sk_mark;
2866 if (msg->msg_controllen) {
2867 err = sock_cmsg_send(sk, msg, &sockc);
2872 if (sock->type == SOCK_RAW)
2873 reserve = dev->hard_header_len;
2874 if (po->has_vnet_hdr) {
2875 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2880 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2881 if (!netif_supports_nofcs(dev)) {
2882 err = -EPROTONOSUPPORT;
2885 extra_len = 4; /* We're doing our own CRC */
2889 if (!vnet_hdr.gso_type &&
2890 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2894 hlen = LL_RESERVED_SPACE(dev);
2895 tlen = dev->needed_tailroom;
2896 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len,
2897 __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len),
2898 msg->msg_flags & MSG_DONTWAIT, &err);
2902 skb_set_network_header(skb, reserve);
2905 if (sock->type == SOCK_DGRAM) {
2906 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2907 if (unlikely(offset < 0))
2910 if (ll_header_truncated(dev, len))
2914 /* Returns -EFAULT on error */
2915 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2919 sock_tx_timestamp(sk, &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 packet_pick_tx_queue(dev, skb);
2934 if (po->has_vnet_hdr) {
2935 err = packet_snd_vnet_gso(skb, &vnet_hdr);
2938 len += sizeof(vnet_hdr);
2941 skb_probe_transport_header(skb, reserve);
2943 if (unlikely(extra_len == 4))
2946 err = po->xmit(skb);
2947 if (err > 0 && (err = net_xmit_errno(err)) != 0)
2963 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2965 struct sock *sk = sock->sk;
2966 struct packet_sock *po = pkt_sk(sk);
2968 if (po->tx_ring.pg_vec)
2969 return tpacket_snd(po, msg);
2971 return packet_snd(sock, msg, len);
2975 * Close a PACKET socket. This is fairly simple. We immediately go
2976 * to 'closed' state and remove our protocol entry in the device list.
2979 static int packet_release(struct socket *sock)
2981 struct sock *sk = sock->sk;
2982 struct packet_sock *po;
2984 union tpacket_req_u req_u;
2992 mutex_lock(&net->packet.sklist_lock);
2993 sk_del_node_init_rcu(sk);
2994 mutex_unlock(&net->packet.sklist_lock);
2997 sock_prot_inuse_add(net, sk->sk_prot, -1);
3000 spin_lock(&po->bind_lock);
3001 unregister_prot_hook(sk, false);
3002 packet_cached_dev_reset(po);
3004 if (po->prot_hook.dev) {
3005 dev_put(po->prot_hook.dev);
3006 po->prot_hook.dev = NULL;
3008 spin_unlock(&po->bind_lock);
3010 packet_flush_mclist(sk);
3012 if (po->rx_ring.pg_vec) {
3013 memset(&req_u, 0, sizeof(req_u));
3014 packet_set_ring(sk, &req_u, 1, 0);
3017 if (po->tx_ring.pg_vec) {
3018 memset(&req_u, 0, sizeof(req_u));
3019 packet_set_ring(sk, &req_u, 1, 1);
3026 * Now the socket is dead. No more input will appear.
3033 skb_queue_purge(&sk->sk_receive_queue);
3034 packet_free_pending(po);
3035 sk_refcnt_debug_release(sk);
3042 * Attach a packet hook.
3045 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3048 struct packet_sock *po = pkt_sk(sk);
3049 struct net_device *dev_curr;
3052 struct net_device *dev = NULL;
3054 bool unlisted = false;
3060 spin_lock(&po->bind_lock);
3064 dev = dev_get_by_name_rcu(sock_net(sk), name);
3069 } else if (ifindex) {
3070 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3080 proto_curr = po->prot_hook.type;
3081 dev_curr = po->prot_hook.dev;
3083 need_rehook = proto_curr != proto || dev_curr != dev;
3088 __unregister_prot_hook(sk, true);
3090 dev_curr = po->prot_hook.dev;
3092 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3097 po->prot_hook.type = proto;
3099 if (unlikely(unlisted)) {
3101 po->prot_hook.dev = NULL;
3103 packet_cached_dev_reset(po);
3105 po->prot_hook.dev = dev;
3106 po->ifindex = dev ? dev->ifindex : 0;
3107 packet_cached_dev_assign(po, dev);
3113 if (proto == 0 || !need_rehook)
3116 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3117 register_prot_hook(sk);
3119 sk->sk_err = ENETDOWN;
3120 if (!sock_flag(sk, SOCK_DEAD))
3121 sk->sk_error_report(sk);
3126 spin_unlock(&po->bind_lock);
3132 * Bind a packet socket to a device
3135 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3138 struct sock *sk = sock->sk;
3145 if (addr_len != sizeof(struct sockaddr))
3147 strlcpy(name, uaddr->sa_data, sizeof(name));
3149 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3152 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3154 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3155 struct sock *sk = sock->sk;
3161 if (addr_len < sizeof(struct sockaddr_ll))
3163 if (sll->sll_family != AF_PACKET)
3166 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3167 sll->sll_protocol ? : pkt_sk(sk)->num);
3170 static struct proto packet_proto = {
3172 .owner = THIS_MODULE,
3173 .obj_size = sizeof(struct packet_sock),
3177 * Create a packet of type SOCK_PACKET.
3180 static int packet_create(struct net *net, struct socket *sock, int protocol,
3184 struct packet_sock *po;
3185 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3188 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3190 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3191 sock->type != SOCK_PACKET)
3192 return -ESOCKTNOSUPPORT;
3194 sock->state = SS_UNCONNECTED;
3197 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3201 sock->ops = &packet_ops;
3202 if (sock->type == SOCK_PACKET)
3203 sock->ops = &packet_ops_spkt;
3205 sock_init_data(sock, sk);
3208 sk->sk_family = PF_PACKET;
3210 po->xmit = dev_queue_xmit;
3212 err = packet_alloc_pending(po);
3216 packet_cached_dev_reset(po);
3218 sk->sk_destruct = packet_sock_destruct;
3219 sk_refcnt_debug_inc(sk);
3222 * Attach a protocol block
3225 spin_lock_init(&po->bind_lock);
3226 mutex_init(&po->pg_vec_lock);
3227 po->rollover = NULL;
3228 po->prot_hook.func = packet_rcv;
3230 if (sock->type == SOCK_PACKET)
3231 po->prot_hook.func = packet_rcv_spkt;
3233 po->prot_hook.af_packet_priv = sk;
3236 po->prot_hook.type = proto;
3237 register_prot_hook(sk);
3240 mutex_lock(&net->packet.sklist_lock);
3241 sk_add_node_rcu(sk, &net->packet.sklist);
3242 mutex_unlock(&net->packet.sklist_lock);
3245 sock_prot_inuse_add(net, &packet_proto, 1);
3256 * Pull a packet from our receive queue and hand it to the user.
3257 * If necessary we block.
3260 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3263 struct sock *sk = sock->sk;
3264 struct sk_buff *skb;
3266 int vnet_hdr_len = 0;
3267 unsigned int origlen = 0;
3270 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3274 /* What error should we return now? EUNATTACH? */
3275 if (pkt_sk(sk)->ifindex < 0)
3279 if (flags & MSG_ERRQUEUE) {
3280 err = sock_recv_errqueue(sk, msg, len,
3281 SOL_PACKET, PACKET_TX_TIMESTAMP);
3286 * Call the generic datagram receiver. This handles all sorts
3287 * of horrible races and re-entrancy so we can forget about it
3288 * in the protocol layers.
3290 * Now it will return ENETDOWN, if device have just gone down,
3291 * but then it will block.
3294 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3297 * An error occurred so return it. Because skb_recv_datagram()
3298 * handles the blocking we don't see and worry about blocking
3305 if (pkt_sk(sk)->pressure)
3306 packet_rcv_has_room(pkt_sk(sk), NULL);
3308 if (pkt_sk(sk)->has_vnet_hdr) {
3309 err = packet_rcv_vnet(msg, skb, &len);
3312 vnet_hdr_len = sizeof(struct virtio_net_hdr);
3315 /* You lose any data beyond the buffer you gave. If it worries
3316 * a user program they can ask the device for its MTU
3322 msg->msg_flags |= MSG_TRUNC;
3325 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3329 if (sock->type != SOCK_PACKET) {
3330 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3332 /* Original length was stored in sockaddr_ll fields */
3333 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3334 sll->sll_family = AF_PACKET;
3335 sll->sll_protocol = skb->protocol;
3338 sock_recv_ts_and_drops(msg, sk, skb);
3340 if (msg->msg_name) {
3341 /* If the address length field is there to be filled
3342 * in, we fill it in now.
3344 if (sock->type == SOCK_PACKET) {
3345 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3346 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3348 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3350 msg->msg_namelen = sll->sll_halen +
3351 offsetof(struct sockaddr_ll, sll_addr);
3353 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
3357 if (pkt_sk(sk)->auxdata) {
3358 struct tpacket_auxdata aux;
3360 aux.tp_status = TP_STATUS_USER;
3361 if (skb->ip_summed == CHECKSUM_PARTIAL)
3362 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3363 else if (skb->pkt_type != PACKET_OUTGOING &&
3364 (skb->ip_summed == CHECKSUM_COMPLETE ||
3365 skb_csum_unnecessary(skb)))
3366 aux.tp_status |= TP_STATUS_CSUM_VALID;
3368 aux.tp_len = origlen;
3369 aux.tp_snaplen = skb->len;
3371 aux.tp_net = skb_network_offset(skb);
3372 if (skb_vlan_tag_present(skb)) {
3373 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3374 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3375 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3377 aux.tp_vlan_tci = 0;
3378 aux.tp_vlan_tpid = 0;
3380 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3384 * Free or return the buffer as appropriate. Again this
3385 * hides all the races and re-entrancy issues from us.
3387 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3390 skb_free_datagram(sk, skb);
3395 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3396 int *uaddr_len, int peer)
3398 struct net_device *dev;
3399 struct sock *sk = sock->sk;
3404 uaddr->sa_family = AF_PACKET;
3405 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3407 dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
3409 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3411 *uaddr_len = sizeof(*uaddr);
3416 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3417 int *uaddr_len, int peer)
3419 struct net_device *dev;
3420 struct sock *sk = sock->sk;
3421 struct packet_sock *po = pkt_sk(sk);
3422 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3427 sll->sll_family = AF_PACKET;
3428 sll->sll_ifindex = po->ifindex;
3429 sll->sll_protocol = po->num;
3430 sll->sll_pkttype = 0;
3432 dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
3434 sll->sll_hatype = dev->type;
3435 sll->sll_halen = dev->addr_len;
3436 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3438 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3442 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3447 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3451 case PACKET_MR_MULTICAST:
3452 if (i->alen != dev->addr_len)
3455 return dev_mc_add(dev, i->addr);
3457 return dev_mc_del(dev, i->addr);
3459 case PACKET_MR_PROMISC:
3460 return dev_set_promiscuity(dev, what);
3461 case PACKET_MR_ALLMULTI:
3462 return dev_set_allmulti(dev, what);
3463 case PACKET_MR_UNICAST:
3464 if (i->alen != dev->addr_len)
3467 return dev_uc_add(dev, i->addr);
3469 return dev_uc_del(dev, i->addr);
3477 static void packet_dev_mclist_delete(struct net_device *dev,
3478 struct packet_mclist **mlp)
3480 struct packet_mclist *ml;
3482 while ((ml = *mlp) != NULL) {
3483 if (ml->ifindex == dev->ifindex) {
3484 packet_dev_mc(dev, ml, -1);
3492 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3494 struct packet_sock *po = pkt_sk(sk);
3495 struct packet_mclist *ml, *i;
3496 struct net_device *dev;
3502 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3507 if (mreq->mr_alen > dev->addr_len)
3511 i = kmalloc(sizeof(*i), GFP_KERNEL);
3516 for (ml = po->mclist; ml; ml = ml->next) {
3517 if (ml->ifindex == mreq->mr_ifindex &&
3518 ml->type == mreq->mr_type &&
3519 ml->alen == mreq->mr_alen &&
3520 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3522 /* Free the new element ... */
3528 i->type = mreq->mr_type;
3529 i->ifindex = mreq->mr_ifindex;
3530 i->alen = mreq->mr_alen;
3531 memcpy(i->addr, mreq->mr_address, i->alen);
3533 i->next = po->mclist;
3535 err = packet_dev_mc(dev, i, 1);
3537 po->mclist = i->next;
3546 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3548 struct packet_mclist *ml, **mlp;
3552 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3553 if (ml->ifindex == mreq->mr_ifindex &&
3554 ml->type == mreq->mr_type &&
3555 ml->alen == mreq->mr_alen &&
3556 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3557 if (--ml->count == 0) {
3558 struct net_device *dev;
3560 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3562 packet_dev_mc(dev, ml, -1);
3572 static void packet_flush_mclist(struct sock *sk)
3574 struct packet_sock *po = pkt_sk(sk);
3575 struct packet_mclist *ml;
3581 while ((ml = po->mclist) != NULL) {
3582 struct net_device *dev;
3584 po->mclist = ml->next;
3585 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3587 packet_dev_mc(dev, ml, -1);
3594 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3596 struct sock *sk = sock->sk;
3597 struct packet_sock *po = pkt_sk(sk);
3600 if (level != SOL_PACKET)
3601 return -ENOPROTOOPT;
3604 case PACKET_ADD_MEMBERSHIP:
3605 case PACKET_DROP_MEMBERSHIP:
3607 struct packet_mreq_max mreq;
3609 memset(&mreq, 0, sizeof(mreq));
3610 if (len < sizeof(struct packet_mreq))
3612 if (len > sizeof(mreq))
3614 if (copy_from_user(&mreq, optval, len))
3616 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3618 if (optname == PACKET_ADD_MEMBERSHIP)
3619 ret = packet_mc_add(sk, &mreq);
3621 ret = packet_mc_drop(sk, &mreq);
3625 case PACKET_RX_RING:
3626 case PACKET_TX_RING:
3628 union tpacket_req_u req_u;
3631 switch (po->tp_version) {
3634 len = sizeof(req_u.req);
3638 len = sizeof(req_u.req3);
3643 if (copy_from_user(&req_u.req, optval, len))
3645 return packet_set_ring(sk, &req_u, 0,
3646 optname == PACKET_TX_RING);
3648 case PACKET_COPY_THRESH:
3652 if (optlen != sizeof(val))
3654 if (copy_from_user(&val, optval, sizeof(val)))
3657 pkt_sk(sk)->copy_thresh = val;
3660 case PACKET_VERSION:
3664 if (optlen != sizeof(val))
3666 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3668 if (copy_from_user(&val, optval, sizeof(val)))
3674 po->tp_version = val;
3680 case PACKET_RESERVE:
3684 if (optlen != sizeof(val))
3686 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3688 if (copy_from_user(&val, optval, sizeof(val)))
3690 po->tp_reserve = val;
3697 if (optlen != sizeof(val))
3699 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3701 if (copy_from_user(&val, optval, sizeof(val)))
3703 po->tp_loss = !!val;
3706 case PACKET_AUXDATA:
3710 if (optlen < sizeof(val))
3712 if (copy_from_user(&val, optval, sizeof(val)))
3715 po->auxdata = !!val;
3718 case PACKET_ORIGDEV:
3722 if (optlen < sizeof(val))
3724 if (copy_from_user(&val, optval, sizeof(val)))
3727 po->origdev = !!val;
3730 case PACKET_VNET_HDR:
3734 if (sock->type != SOCK_RAW)
3736 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3738 if (optlen < sizeof(val))
3740 if (copy_from_user(&val, optval, sizeof(val)))
3743 po->has_vnet_hdr = !!val;
3746 case PACKET_TIMESTAMP:
3750 if (optlen != sizeof(val))
3752 if (copy_from_user(&val, optval, sizeof(val)))
3755 po->tp_tstamp = val;
3762 if (optlen != sizeof(val))
3764 if (copy_from_user(&val, optval, sizeof(val)))
3767 return fanout_add(sk, val & 0xffff, val >> 16);
3769 case PACKET_FANOUT_DATA:
3774 return fanout_set_data(po, optval, optlen);
3776 case PACKET_TX_HAS_OFF:
3780 if (optlen != sizeof(val))
3782 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
3784 if (copy_from_user(&val, optval, sizeof(val)))
3786 po->tp_tx_has_off = !!val;
3789 case PACKET_QDISC_BYPASS:
3793 if (optlen != sizeof(val))
3795 if (copy_from_user(&val, optval, sizeof(val)))
3798 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3802 return -ENOPROTOOPT;
3806 static int packet_getsockopt(struct socket *sock, int level, int optname,
3807 char __user *optval, int __user *optlen)
3810 int val, lv = sizeof(val);
3811 struct sock *sk = sock->sk;
3812 struct packet_sock *po = pkt_sk(sk);
3814 union tpacket_stats_u st;
3815 struct tpacket_rollover_stats rstats;
3817 if (level != SOL_PACKET)
3818 return -ENOPROTOOPT;
3820 if (get_user(len, optlen))
3827 case PACKET_STATISTICS:
3828 spin_lock_bh(&sk->sk_receive_queue.lock);
3829 memcpy(&st, &po->stats, sizeof(st));
3830 memset(&po->stats, 0, sizeof(po->stats));
3831 spin_unlock_bh(&sk->sk_receive_queue.lock);
3833 if (po->tp_version == TPACKET_V3) {
3834 lv = sizeof(struct tpacket_stats_v3);
3835 st.stats3.tp_packets += st.stats3.tp_drops;
3838 lv = sizeof(struct tpacket_stats);
3839 st.stats1.tp_packets += st.stats1.tp_drops;
3844 case PACKET_AUXDATA:
3847 case PACKET_ORIGDEV:
3850 case PACKET_VNET_HDR:
3851 val = po->has_vnet_hdr;
3853 case PACKET_VERSION:
3854 val = po->tp_version;
3857 if (len > sizeof(int))
3859 if (copy_from_user(&val, optval, len))
3863 val = sizeof(struct tpacket_hdr);
3866 val = sizeof(struct tpacket2_hdr);
3869 val = sizeof(struct tpacket3_hdr);
3875 case PACKET_RESERVE:
3876 val = po->tp_reserve;
3881 case PACKET_TIMESTAMP:
3882 val = po->tp_tstamp;
3886 ((u32)po->fanout->id |
3887 ((u32)po->fanout->type << 16) |
3888 ((u32)po->fanout->flags << 24)) :
3891 case PACKET_ROLLOVER_STATS:
3894 rstats.tp_all = atomic_long_read(&po->rollover->num);
3895 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
3896 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
3898 lv = sizeof(rstats);
3900 case PACKET_TX_HAS_OFF:
3901 val = po->tp_tx_has_off;
3903 case PACKET_QDISC_BYPASS:
3904 val = packet_use_direct_xmit(po);
3907 return -ENOPROTOOPT;
3912 if (put_user(len, optlen))
3914 if (copy_to_user(optval, data, len))
3920 static int packet_notifier(struct notifier_block *this,
3921 unsigned long msg, void *ptr)
3924 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3925 struct net *net = dev_net(dev);
3928 sk_for_each_rcu(sk, &net->packet.sklist) {
3929 struct packet_sock *po = pkt_sk(sk);
3932 case NETDEV_UNREGISTER:
3934 packet_dev_mclist_delete(dev, &po->mclist);
3938 if (dev->ifindex == po->ifindex) {
3939 spin_lock(&po->bind_lock);
3941 __unregister_prot_hook(sk, false);
3942 sk->sk_err = ENETDOWN;
3943 if (!sock_flag(sk, SOCK_DEAD))
3944 sk->sk_error_report(sk);
3946 if (msg == NETDEV_UNREGISTER) {
3947 packet_cached_dev_reset(po);
3949 if (po->prot_hook.dev)
3950 dev_put(po->prot_hook.dev);
3951 po->prot_hook.dev = NULL;
3953 spin_unlock(&po->bind_lock);
3957 if (dev->ifindex == po->ifindex) {
3958 spin_lock(&po->bind_lock);
3960 register_prot_hook(sk);
3961 spin_unlock(&po->bind_lock);
3971 static int packet_ioctl(struct socket *sock, unsigned int cmd,
3974 struct sock *sk = sock->sk;
3979 int amount = sk_wmem_alloc_get(sk);
3981 return put_user(amount, (int __user *)arg);
3985 struct sk_buff *skb;
3988 spin_lock_bh(&sk->sk_receive_queue.lock);
3989 skb = skb_peek(&sk->sk_receive_queue);
3992 spin_unlock_bh(&sk->sk_receive_queue.lock);
3993 return put_user(amount, (int __user *)arg);
3996 return sock_get_timestamp(sk, (struct timeval __user *)arg);
3998 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4008 case SIOCGIFBRDADDR:
4009 case SIOCSIFBRDADDR:
4010 case SIOCGIFNETMASK:
4011 case SIOCSIFNETMASK:
4012 case SIOCGIFDSTADDR:
4013 case SIOCSIFDSTADDR:
4015 return inet_dgram_ops.ioctl(sock, cmd, arg);
4019 return -ENOIOCTLCMD;
4024 static unsigned int packet_poll(struct file *file, struct socket *sock,
4027 struct sock *sk = sock->sk;
4028 struct packet_sock *po = pkt_sk(sk);
4029 unsigned int mask = datagram_poll(file, sock, wait);
4031 spin_lock_bh(&sk->sk_receive_queue.lock);
4032 if (po->rx_ring.pg_vec) {
4033 if (!packet_previous_rx_frame(po, &po->rx_ring,
4035 mask |= POLLIN | POLLRDNORM;
4037 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4039 spin_unlock_bh(&sk->sk_receive_queue.lock);
4040 spin_lock_bh(&sk->sk_write_queue.lock);
4041 if (po->tx_ring.pg_vec) {
4042 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4043 mask |= POLLOUT | POLLWRNORM;
4045 spin_unlock_bh(&sk->sk_write_queue.lock);
4050 /* Dirty? Well, I still did not learn better way to account
4054 static void packet_mm_open(struct vm_area_struct *vma)
4056 struct file *file = vma->vm_file;
4057 struct socket *sock = file->private_data;
4058 struct sock *sk = sock->sk;
4061 atomic_inc(&pkt_sk(sk)->mapped);
4064 static void packet_mm_close(struct vm_area_struct *vma)
4066 struct file *file = vma->vm_file;
4067 struct socket *sock = file->private_data;
4068 struct sock *sk = sock->sk;
4071 atomic_dec(&pkt_sk(sk)->mapped);
4074 static const struct vm_operations_struct packet_mmap_ops = {
4075 .open = packet_mm_open,
4076 .close = packet_mm_close,
4079 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4084 for (i = 0; i < len; i++) {
4085 if (likely(pg_vec[i].buffer)) {
4086 if (is_vmalloc_addr(pg_vec[i].buffer))
4087 vfree(pg_vec[i].buffer);
4089 free_pages((unsigned long)pg_vec[i].buffer,
4091 pg_vec[i].buffer = NULL;
4097 static char *alloc_one_pg_vec_page(unsigned long order)
4100 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4101 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4103 buffer = (char *) __get_free_pages(gfp_flags, order);
4107 /* __get_free_pages failed, fall back to vmalloc */
4108 buffer = vzalloc((1 << order) * PAGE_SIZE);
4112 /* vmalloc failed, lets dig into swap here */
4113 gfp_flags &= ~__GFP_NORETRY;
4114 buffer = (char *) __get_free_pages(gfp_flags, order);
4118 /* complete and utter failure */
4122 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4124 unsigned int block_nr = req->tp_block_nr;
4128 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
4129 if (unlikely(!pg_vec))
4132 for (i = 0; i < block_nr; i++) {
4133 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4134 if (unlikely(!pg_vec[i].buffer))
4135 goto out_free_pgvec;
4142 free_pg_vec(pg_vec, order, block_nr);
4147 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4148 int closing, int tx_ring)
4150 struct pgv *pg_vec = NULL;
4151 struct packet_sock *po = pkt_sk(sk);
4152 int was_running, order = 0;
4153 struct packet_ring_buffer *rb;
4154 struct sk_buff_head *rb_queue;
4157 /* Added to avoid minimal code churn */
4158 struct tpacket_req *req = &req_u->req;
4160 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
4161 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
4162 WARN(1, "Tx-ring is not supported.\n");
4166 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4167 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4171 if (atomic_read(&po->mapped))
4173 if (packet_read_pending(rb))
4177 if (req->tp_block_nr) {
4178 /* Sanity tests and some calculations */
4180 if (unlikely(rb->pg_vec))
4183 switch (po->tp_version) {
4185 po->tp_hdrlen = TPACKET_HDRLEN;
4188 po->tp_hdrlen = TPACKET2_HDRLEN;
4191 po->tp_hdrlen = TPACKET3_HDRLEN;
4196 if (unlikely((int)req->tp_block_size <= 0))
4198 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4200 if (po->tp_version >= TPACKET_V3 &&
4201 (int)(req->tp_block_size -
4202 BLK_PLUS_PRIV(req_u->req3.tp_sizeof_priv)) <= 0)
4204 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
4207 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4210 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4211 if (unlikely(rb->frames_per_block == 0))
4213 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4218 order = get_order(req->tp_block_size);
4219 pg_vec = alloc_pg_vec(req, order);
4220 if (unlikely(!pg_vec))
4222 switch (po->tp_version) {
4224 /* Transmit path is not supported. We checked
4225 * it above but just being paranoid
4228 init_prb_bdqc(po, rb, pg_vec, req_u);
4237 if (unlikely(req->tp_frame_nr))
4243 /* Detach socket from network */
4244 spin_lock(&po->bind_lock);
4245 was_running = po->running;
4249 __unregister_prot_hook(sk, false);
4251 spin_unlock(&po->bind_lock);
4256 mutex_lock(&po->pg_vec_lock);
4257 if (closing || atomic_read(&po->mapped) == 0) {
4259 spin_lock_bh(&rb_queue->lock);
4260 swap(rb->pg_vec, pg_vec);
4261 rb->frame_max = (req->tp_frame_nr - 1);
4263 rb->frame_size = req->tp_frame_size;
4264 spin_unlock_bh(&rb_queue->lock);
4266 swap(rb->pg_vec_order, order);
4267 swap(rb->pg_vec_len, req->tp_block_nr);
4269 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4270 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4271 tpacket_rcv : packet_rcv;
4272 skb_queue_purge(rb_queue);
4273 if (atomic_read(&po->mapped))
4274 pr_err("packet_mmap: vma is busy: %d\n",
4275 atomic_read(&po->mapped));
4277 mutex_unlock(&po->pg_vec_lock);
4279 spin_lock(&po->bind_lock);
4282 register_prot_hook(sk);
4284 spin_unlock(&po->bind_lock);
4285 if (closing && (po->tp_version > TPACKET_V2)) {
4286 /* Because we don't support block-based V3 on tx-ring */
4288 prb_shutdown_retire_blk_timer(po, rb_queue);
4293 free_pg_vec(pg_vec, order, req->tp_block_nr);
4298 static int packet_mmap(struct file *file, struct socket *sock,
4299 struct vm_area_struct *vma)
4301 struct sock *sk = sock->sk;
4302 struct packet_sock *po = pkt_sk(sk);
4303 unsigned long size, expected_size;
4304 struct packet_ring_buffer *rb;
4305 unsigned long start;
4312 mutex_lock(&po->pg_vec_lock);
4315 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4317 expected_size += rb->pg_vec_len
4323 if (expected_size == 0)
4326 size = vma->vm_end - vma->vm_start;
4327 if (size != expected_size)
4330 start = vma->vm_start;
4331 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4332 if (rb->pg_vec == NULL)
4335 for (i = 0; i < rb->pg_vec_len; i++) {
4337 void *kaddr = rb->pg_vec[i].buffer;
4340 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4341 page = pgv_to_page(kaddr);
4342 err = vm_insert_page(vma, start, page);
4351 atomic_inc(&po->mapped);
4352 vma->vm_ops = &packet_mmap_ops;
4356 mutex_unlock(&po->pg_vec_lock);
4360 static const struct proto_ops packet_ops_spkt = {
4361 .family = PF_PACKET,
4362 .owner = THIS_MODULE,
4363 .release = packet_release,
4364 .bind = packet_bind_spkt,
4365 .connect = sock_no_connect,
4366 .socketpair = sock_no_socketpair,
4367 .accept = sock_no_accept,
4368 .getname = packet_getname_spkt,
4369 .poll = datagram_poll,
4370 .ioctl = packet_ioctl,
4371 .listen = sock_no_listen,
4372 .shutdown = sock_no_shutdown,
4373 .setsockopt = sock_no_setsockopt,
4374 .getsockopt = sock_no_getsockopt,
4375 .sendmsg = packet_sendmsg_spkt,
4376 .recvmsg = packet_recvmsg,
4377 .mmap = sock_no_mmap,
4378 .sendpage = sock_no_sendpage,
4381 static const struct proto_ops packet_ops = {
4382 .family = PF_PACKET,
4383 .owner = THIS_MODULE,
4384 .release = packet_release,
4385 .bind = packet_bind,
4386 .connect = sock_no_connect,
4387 .socketpair = sock_no_socketpair,
4388 .accept = sock_no_accept,
4389 .getname = packet_getname,
4390 .poll = packet_poll,
4391 .ioctl = packet_ioctl,
4392 .listen = sock_no_listen,
4393 .shutdown = sock_no_shutdown,
4394 .setsockopt = packet_setsockopt,
4395 .getsockopt = packet_getsockopt,
4396 .sendmsg = packet_sendmsg,
4397 .recvmsg = packet_recvmsg,
4398 .mmap = packet_mmap,
4399 .sendpage = sock_no_sendpage,
4402 static const struct net_proto_family packet_family_ops = {
4403 .family = PF_PACKET,
4404 .create = packet_create,
4405 .owner = THIS_MODULE,
4408 static struct notifier_block packet_netdev_notifier = {
4409 .notifier_call = packet_notifier,
4412 #ifdef CONFIG_PROC_FS
4414 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4417 struct net *net = seq_file_net(seq);
4420 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4423 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4425 struct net *net = seq_file_net(seq);
4426 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4429 static void packet_seq_stop(struct seq_file *seq, void *v)
4435 static int packet_seq_show(struct seq_file *seq, void *v)
4437 if (v == SEQ_START_TOKEN)
4438 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4440 struct sock *s = sk_entry(v);
4441 const struct packet_sock *po = pkt_sk(s);
4444 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4446 atomic_read(&s->sk_refcnt),
4451 atomic_read(&s->sk_rmem_alloc),
4452 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4459 static const struct seq_operations packet_seq_ops = {
4460 .start = packet_seq_start,
4461 .next = packet_seq_next,
4462 .stop = packet_seq_stop,
4463 .show = packet_seq_show,
4466 static int packet_seq_open(struct inode *inode, struct file *file)
4468 return seq_open_net(inode, file, &packet_seq_ops,
4469 sizeof(struct seq_net_private));
4472 static const struct file_operations packet_seq_fops = {
4473 .owner = THIS_MODULE,
4474 .open = packet_seq_open,
4476 .llseek = seq_lseek,
4477 .release = seq_release_net,
4482 static int __net_init packet_net_init(struct net *net)
4484 mutex_init(&net->packet.sklist_lock);
4485 INIT_HLIST_HEAD(&net->packet.sklist);
4487 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4493 static void __net_exit packet_net_exit(struct net *net)
4495 remove_proc_entry("packet", net->proc_net);
4498 static struct pernet_operations packet_net_ops = {
4499 .init = packet_net_init,
4500 .exit = packet_net_exit,
4504 static void __exit packet_exit(void)
4506 unregister_netdevice_notifier(&packet_netdev_notifier);
4507 unregister_pernet_subsys(&packet_net_ops);
4508 sock_unregister(PF_PACKET);
4509 proto_unregister(&packet_proto);
4512 static int __init packet_init(void)
4514 int rc = proto_register(&packet_proto, 0);
4519 sock_register(&packet_family_ops);
4520 register_pernet_subsys(&packet_net_ops);
4521 register_netdevice_notifier(&packet_netdev_notifier);
4526 module_init(packet_init);
4527 module_exit(packet_exit);
4528 MODULE_LICENSE("GPL");
4529 MODULE_ALIAS_NETPROTO(PF_PACKET);