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>
96 #include <net/compat.h>
102 - if device has no dev->hard_header routine, it adds and removes ll header
103 inside itself. In this case ll header is invisible outside of device,
104 but higher levels still should reserve dev->hard_header_len.
105 Some devices are enough clever to reallocate skb, when header
106 will not fit to reserved space (tunnel), another ones are silly
108 - packet socket receives packets with pulled ll header,
109 so that SOCK_RAW should push it back.
114 Incoming, dev->hard_header!=NULL
115 mac_header -> ll header
118 Outgoing, dev->hard_header!=NULL
119 mac_header -> ll header
122 Incoming, dev->hard_header==NULL
123 mac_header -> UNKNOWN position. It is very likely, that it points to ll
124 header. PPP makes it, that is wrong, because introduce
125 assymetry between rx and tx paths.
128 Outgoing, dev->hard_header==NULL
129 mac_header -> data. ll header is still not built!
133 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
139 dev->hard_header != NULL
140 mac_header -> ll header
143 dev->hard_header == NULL (ll header is added by device, we cannot control it)
147 We should set nh.raw on output to correct posistion,
148 packet classifier depends on it.
151 /* Private packet socket structures. */
153 /* identical to struct packet_mreq except it has
154 * a longer address field.
156 struct packet_mreq_max {
158 unsigned short mr_type;
159 unsigned short mr_alen;
160 unsigned char mr_address[MAX_ADDR_LEN];
164 struct tpacket_hdr *h1;
165 struct tpacket2_hdr *h2;
166 struct tpacket3_hdr *h3;
170 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
171 int closing, int tx_ring);
173 #define V3_ALIGNMENT (8)
175 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
177 #define BLK_PLUS_PRIV(sz_of_priv) \
178 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
180 #define PGV_FROM_VMALLOC 1
182 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
183 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
184 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
185 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
186 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
187 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
188 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
191 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
192 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
193 struct packet_type *pt, struct net_device *orig_dev);
195 static void *packet_previous_frame(struct packet_sock *po,
196 struct packet_ring_buffer *rb,
198 static void packet_increment_head(struct packet_ring_buffer *buff);
199 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
200 struct tpacket_block_desc *);
201 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
202 struct packet_sock *);
203 static void prb_retire_current_block(struct tpacket_kbdq_core *,
204 struct packet_sock *, unsigned int status);
205 static int prb_queue_frozen(struct tpacket_kbdq_core *);
206 static void prb_open_block(struct tpacket_kbdq_core *,
207 struct tpacket_block_desc *);
208 static void prb_retire_rx_blk_timer_expired(unsigned long);
209 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
210 static void prb_init_blk_timer(struct packet_sock *,
211 struct tpacket_kbdq_core *,
212 void (*func) (unsigned long));
213 static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
214 static void prb_clear_rxhash(struct tpacket_kbdq_core *,
215 struct tpacket3_hdr *);
216 static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
217 struct tpacket3_hdr *);
218 static void packet_flush_mclist(struct sock *sk);
220 struct packet_skb_cb {
222 struct sockaddr_pkt pkt;
224 /* Trick: alias skb original length with
225 * ll.sll_family and ll.protocol in order
228 unsigned int origlen;
229 struct sockaddr_ll ll;
234 #define vio_le() virtio_legacy_is_little_endian()
236 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
238 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
239 #define GET_PBLOCK_DESC(x, bid) \
240 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
241 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
242 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
243 #define GET_NEXT_PRB_BLK_NUM(x) \
244 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
245 ((x)->kactive_blk_num+1) : 0)
247 static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
248 static void __fanout_link(struct sock *sk, struct packet_sock *po);
250 static int packet_direct_xmit(struct sk_buff *skb)
252 struct net_device *dev = skb->dev;
253 struct sk_buff *orig_skb = skb;
254 struct netdev_queue *txq;
255 int ret = NETDEV_TX_BUSY;
257 if (unlikely(!netif_running(dev) ||
258 !netif_carrier_ok(dev)))
261 skb = validate_xmit_skb_list(skb, dev);
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 through register_prot_hook
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 static void register_prot_hook(struct sock *sk)
357 lockdep_assert_held_once(&pkt_sk(sk)->bind_lock);
358 __register_prot_hook(sk);
361 /* If the sync parameter is true, we will temporarily drop
362 * the po->bind_lock and do a synchronize_net to make sure no
363 * asynchronous packet processing paths still refer to the elements
364 * of po->prot_hook. If the sync parameter is false, it is the
365 * callers responsibility to take care of this.
367 static void __unregister_prot_hook(struct sock *sk, bool sync)
369 struct packet_sock *po = pkt_sk(sk);
371 lockdep_assert_held_once(&po->bind_lock);
376 __fanout_unlink(sk, po);
378 __dev_remove_pack(&po->prot_hook);
383 spin_unlock(&po->bind_lock);
385 spin_lock(&po->bind_lock);
389 static void unregister_prot_hook(struct sock *sk, bool sync)
391 struct packet_sock *po = pkt_sk(sk);
394 __unregister_prot_hook(sk, sync);
397 static inline struct page * __pure pgv_to_page(void *addr)
399 if (is_vmalloc_addr(addr))
400 return vmalloc_to_page(addr);
401 return virt_to_page(addr);
404 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
406 union tpacket_uhdr h;
409 switch (po->tp_version) {
411 h.h1->tp_status = status;
412 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
415 h.h2->tp_status = status;
416 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
420 WARN(1, "TPACKET version not supported.\n");
427 static int __packet_get_status(struct packet_sock *po, void *frame)
429 union tpacket_uhdr h;
434 switch (po->tp_version) {
436 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
437 return h.h1->tp_status;
439 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
440 return h.h2->tp_status;
443 WARN(1, "TPACKET version not supported.\n");
449 static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
452 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
455 (flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
456 ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
457 return TP_STATUS_TS_RAW_HARDWARE;
459 if (ktime_to_timespec_cond(skb->tstamp, ts))
460 return TP_STATUS_TS_SOFTWARE;
465 static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
468 union tpacket_uhdr h;
472 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
476 switch (po->tp_version) {
478 h.h1->tp_sec = ts.tv_sec;
479 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
482 h.h2->tp_sec = ts.tv_sec;
483 h.h2->tp_nsec = ts.tv_nsec;
487 WARN(1, "TPACKET version not supported.\n");
491 /* one flush is safe, as both fields always lie on the same cacheline */
492 flush_dcache_page(pgv_to_page(&h.h1->tp_sec));
498 static void *packet_lookup_frame(struct packet_sock *po,
499 struct packet_ring_buffer *rb,
500 unsigned int position,
503 unsigned int pg_vec_pos, frame_offset;
504 union tpacket_uhdr h;
506 pg_vec_pos = position / rb->frames_per_block;
507 frame_offset = position % rb->frames_per_block;
509 h.raw = rb->pg_vec[pg_vec_pos].buffer +
510 (frame_offset * rb->frame_size);
512 if (status != __packet_get_status(po, h.raw))
518 static void *packet_current_frame(struct packet_sock *po,
519 struct packet_ring_buffer *rb,
522 return packet_lookup_frame(po, rb, rb->head, status);
525 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
527 del_timer_sync(&pkc->retire_blk_timer);
530 static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
531 struct sk_buff_head *rb_queue)
533 struct tpacket_kbdq_core *pkc;
535 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
537 spin_lock_bh(&rb_queue->lock);
538 pkc->delete_blk_timer = 1;
539 spin_unlock_bh(&rb_queue->lock);
541 prb_del_retire_blk_timer(pkc);
544 static void prb_init_blk_timer(struct packet_sock *po,
545 struct tpacket_kbdq_core *pkc,
546 void (*func) (unsigned long))
548 init_timer(&pkc->retire_blk_timer);
549 pkc->retire_blk_timer.data = (long)po;
550 pkc->retire_blk_timer.function = func;
551 pkc->retire_blk_timer.expires = jiffies;
554 static void prb_setup_retire_blk_timer(struct packet_sock *po)
556 struct tpacket_kbdq_core *pkc;
558 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
559 prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
562 static int prb_calc_retire_blk_tmo(struct packet_sock *po,
563 int blk_size_in_bytes)
565 struct net_device *dev;
566 unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
567 struct ethtool_link_ksettings ecmd;
571 dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
572 if (unlikely(!dev)) {
574 return DEFAULT_PRB_RETIRE_TOV;
576 err = __ethtool_get_link_ksettings(dev, &ecmd);
580 * If the link speed is so slow you don't really
581 * need to worry about perf anyways
583 if (ecmd.base.speed < SPEED_1000 ||
584 ecmd.base.speed == SPEED_UNKNOWN) {
585 return DEFAULT_PRB_RETIRE_TOV;
588 div = ecmd.base.speed / 1000;
591 return DEFAULT_PRB_RETIRE_TOV;
593 mbits = (blk_size_in_bytes * 8) / (1024 * 1024);
605 static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
606 union tpacket_req_u *req_u)
608 p1->feature_req_word = req_u->req3.tp_feature_req_word;
611 static void init_prb_bdqc(struct packet_sock *po,
612 struct packet_ring_buffer *rb,
614 union tpacket_req_u *req_u)
616 struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb);
617 struct tpacket_block_desc *pbd;
619 memset(p1, 0x0, sizeof(*p1));
621 p1->knxt_seq_num = 1;
623 pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
624 p1->pkblk_start = pg_vec[0].buffer;
625 p1->kblk_size = req_u->req3.tp_block_size;
626 p1->knum_blocks = req_u->req3.tp_block_nr;
627 p1->hdrlen = po->tp_hdrlen;
628 p1->version = po->tp_version;
629 p1->last_kactive_blk_num = 0;
630 po->stats.stats3.tp_freeze_q_cnt = 0;
631 if (req_u->req3.tp_retire_blk_tov)
632 p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
634 p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
635 req_u->req3.tp_block_size);
636 p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
637 p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
639 p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
640 prb_init_ft_ops(p1, req_u);
641 prb_setup_retire_blk_timer(po);
642 prb_open_block(p1, pbd);
645 /* Do NOT update the last_blk_num first.
646 * Assumes sk_buff_head lock is held.
648 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
650 mod_timer(&pkc->retire_blk_timer,
651 jiffies + pkc->tov_in_jiffies);
652 pkc->last_kactive_blk_num = pkc->kactive_blk_num;
657 * 1) We refresh the timer only when we open a block.
658 * By doing this we don't waste cycles refreshing the timer
659 * on packet-by-packet basis.
661 * With a 1MB block-size, on a 1Gbps line, it will take
662 * i) ~8 ms to fill a block + ii) memcpy etc.
663 * In this cut we are not accounting for the memcpy time.
665 * So, if the user sets the 'tmo' to 10ms then the timer
666 * will never fire while the block is still getting filled
667 * (which is what we want). However, the user could choose
668 * to close a block early and that's fine.
670 * But when the timer does fire, we check whether or not to refresh it.
671 * Since the tmo granularity is in msecs, it is not too expensive
672 * to refresh the timer, lets say every '8' msecs.
673 * Either the user can set the 'tmo' or we can derive it based on
674 * a) line-speed and b) block-size.
675 * prb_calc_retire_blk_tmo() calculates the tmo.
678 static void prb_retire_rx_blk_timer_expired(unsigned long data)
680 struct packet_sock *po = (struct packet_sock *)data;
681 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
683 struct tpacket_block_desc *pbd;
685 spin_lock(&po->sk.sk_receive_queue.lock);
687 frozen = prb_queue_frozen(pkc);
688 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
690 if (unlikely(pkc->delete_blk_timer))
693 /* We only need to plug the race when the block is partially filled.
695 * lock(); increment BLOCK_NUM_PKTS; unlock()
696 * copy_bits() is in progress ...
697 * timer fires on other cpu:
698 * we can't retire the current block because copy_bits
702 if (BLOCK_NUM_PKTS(pbd)) {
703 while (atomic_read(&pkc->blk_fill_in_prog)) {
704 /* Waiting for skb_copy_bits to finish... */
709 if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
711 if (!BLOCK_NUM_PKTS(pbd)) {
712 /* An empty block. Just refresh the timer. */
715 prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
716 if (!prb_dispatch_next_block(pkc, po))
721 /* Case 1. Queue was frozen because user-space was
724 if (prb_curr_blk_in_use(pkc, pbd)) {
726 * Ok, user-space is still behind.
727 * So just refresh the timer.
731 /* Case 2. queue was frozen,user-space caught up,
732 * now the link went idle && the timer fired.
733 * We don't have a block to close.So we open this
734 * block and restart the timer.
735 * opening a block thaws the queue,restarts timer
736 * Thawing/timer-refresh is a side effect.
738 prb_open_block(pkc, pbd);
745 _prb_refresh_rx_retire_blk_timer(pkc);
748 spin_unlock(&po->sk.sk_receive_queue.lock);
751 static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
752 struct tpacket_block_desc *pbd1, __u32 status)
754 /* Flush everything minus the block header */
756 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
761 /* Skip the block header(we know header WILL fit in 4K) */
764 end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
765 for (; start < end; start += PAGE_SIZE)
766 flush_dcache_page(pgv_to_page(start));
771 /* Now update the block status. */
773 BLOCK_STATUS(pbd1) = status;
775 /* Flush the block header */
777 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
779 flush_dcache_page(pgv_to_page(start));
789 * 2) Increment active_blk_num
791 * Note:We DONT refresh the timer on purpose.
792 * Because almost always the next block will be opened.
794 static void prb_close_block(struct tpacket_kbdq_core *pkc1,
795 struct tpacket_block_desc *pbd1,
796 struct packet_sock *po, unsigned int stat)
798 __u32 status = TP_STATUS_USER | stat;
800 struct tpacket3_hdr *last_pkt;
801 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
802 struct sock *sk = &po->sk;
804 if (po->stats.stats3.tp_drops)
805 status |= TP_STATUS_LOSING;
807 last_pkt = (struct tpacket3_hdr *)pkc1->prev;
808 last_pkt->tp_next_offset = 0;
810 /* Get the ts of the last pkt */
811 if (BLOCK_NUM_PKTS(pbd1)) {
812 h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
813 h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
815 /* Ok, we tmo'd - so get the current time.
817 * It shouldn't really happen as we don't close empty
818 * blocks. See prb_retire_rx_blk_timer_expired().
822 h1->ts_last_pkt.ts_sec = ts.tv_sec;
823 h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
828 /* Flush the block */
829 prb_flush_block(pkc1, pbd1, status);
831 sk->sk_data_ready(sk);
833 pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
836 static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
838 pkc->reset_pending_on_curr_blk = 0;
842 * Side effect of opening a block:
844 * 1) prb_queue is thawed.
845 * 2) retire_blk_timer is refreshed.
848 static void prb_open_block(struct tpacket_kbdq_core *pkc1,
849 struct tpacket_block_desc *pbd1)
852 struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
856 /* We could have just memset this but we will lose the
857 * flexibility of making the priv area sticky
860 BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
861 BLOCK_NUM_PKTS(pbd1) = 0;
862 BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
866 h1->ts_first_pkt.ts_sec = ts.tv_sec;
867 h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
869 pkc1->pkblk_start = (char *)pbd1;
870 pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
872 BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
873 BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
875 pbd1->version = pkc1->version;
876 pkc1->prev = pkc1->nxt_offset;
877 pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
879 prb_thaw_queue(pkc1);
880 _prb_refresh_rx_retire_blk_timer(pkc1);
886 * Queue freeze logic:
887 * 1) Assume tp_block_nr = 8 blocks.
888 * 2) At time 't0', user opens Rx ring.
889 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
890 * 4) user-space is either sleeping or processing block '0'.
891 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
892 * it will close block-7,loop around and try to fill block '0'.
894 * __packet_lookup_frame_in_block
895 * prb_retire_current_block()
896 * prb_dispatch_next_block()
897 * |->(BLOCK_STATUS == USER) evaluates to true
898 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
899 * 6) Now there are two cases:
900 * 6.1) Link goes idle right after the queue is frozen.
901 * But remember, the last open_block() refreshed the timer.
902 * When this timer expires,it will refresh itself so that we can
903 * re-open block-0 in near future.
904 * 6.2) Link is busy and keeps on receiving packets. This is a simple
905 * case and __packet_lookup_frame_in_block will check if block-0
906 * is free and can now be re-used.
908 static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
909 struct packet_sock *po)
911 pkc->reset_pending_on_curr_blk = 1;
912 po->stats.stats3.tp_freeze_q_cnt++;
915 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
918 * If the next block is free then we will dispatch it
919 * and return a good offset.
920 * Else, we will freeze the queue.
921 * So, caller must check the return value.
923 static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
924 struct packet_sock *po)
926 struct tpacket_block_desc *pbd;
930 /* 1. Get current block num */
931 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
933 /* 2. If this block is currently in_use then freeze the queue */
934 if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
935 prb_freeze_queue(pkc, po);
941 * open this block and return the offset where the first packet
942 * needs to get stored.
944 prb_open_block(pkc, pbd);
945 return (void *)pkc->nxt_offset;
948 static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
949 struct packet_sock *po, unsigned int status)
951 struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
953 /* retire/close the current block */
954 if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
956 * Plug the case where copy_bits() is in progress on
957 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
958 * have space to copy the pkt in the current block and
959 * called prb_retire_current_block()
961 * We don't need to worry about the TMO case because
962 * the timer-handler already handled this case.
964 if (!(status & TP_STATUS_BLK_TMO)) {
965 while (atomic_read(&pkc->blk_fill_in_prog)) {
966 /* Waiting for skb_copy_bits to finish... */
970 prb_close_block(pkc, pbd, po, status);
975 static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
976 struct tpacket_block_desc *pbd)
978 return TP_STATUS_USER & BLOCK_STATUS(pbd);
981 static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
983 return pkc->reset_pending_on_curr_blk;
986 static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
988 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
989 atomic_dec(&pkc->blk_fill_in_prog);
992 static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
993 struct tpacket3_hdr *ppd)
995 ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb);
998 static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
999 struct tpacket3_hdr *ppd)
1001 ppd->hv1.tp_rxhash = 0;
1004 static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
1005 struct tpacket3_hdr *ppd)
1007 if (skb_vlan_tag_present(pkc->skb)) {
1008 ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb);
1009 ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto);
1010 ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
1012 ppd->hv1.tp_vlan_tci = 0;
1013 ppd->hv1.tp_vlan_tpid = 0;
1014 ppd->tp_status = TP_STATUS_AVAILABLE;
1018 static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
1019 struct tpacket3_hdr *ppd)
1021 ppd->hv1.tp_padding = 0;
1022 prb_fill_vlan_info(pkc, ppd);
1024 if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
1025 prb_fill_rxhash(pkc, ppd);
1027 prb_clear_rxhash(pkc, ppd);
1030 static void prb_fill_curr_block(char *curr,
1031 struct tpacket_kbdq_core *pkc,
1032 struct tpacket_block_desc *pbd,
1035 struct tpacket3_hdr *ppd;
1037 ppd = (struct tpacket3_hdr *)curr;
1038 ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
1040 pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
1041 BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
1042 BLOCK_NUM_PKTS(pbd) += 1;
1043 atomic_inc(&pkc->blk_fill_in_prog);
1044 prb_run_all_ft_ops(pkc, ppd);
1047 /* Assumes caller has the sk->rx_queue.lock */
1048 static void *__packet_lookup_frame_in_block(struct packet_sock *po,
1049 struct sk_buff *skb,
1054 struct tpacket_kbdq_core *pkc;
1055 struct tpacket_block_desc *pbd;
1058 pkc = GET_PBDQC_FROM_RB(&po->rx_ring);
1059 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1061 /* Queue is frozen when user space is lagging behind */
1062 if (prb_queue_frozen(pkc)) {
1064 * Check if that last block which caused the queue to freeze,
1065 * is still in_use by user-space.
1067 if (prb_curr_blk_in_use(pkc, pbd)) {
1068 /* Can't record this packet */
1072 * Ok, the block was released by user-space.
1073 * Now let's open that block.
1074 * opening a block also thaws the queue.
1075 * Thawing is a side effect.
1077 prb_open_block(pkc, pbd);
1082 curr = pkc->nxt_offset;
1084 end = (char *)pbd + pkc->kblk_size;
1086 /* first try the current block */
1087 if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
1088 prb_fill_curr_block(curr, pkc, pbd, len);
1089 return (void *)curr;
1092 /* Ok, close the current block */
1093 prb_retire_current_block(pkc, po, 0);
1095 /* Now, try to dispatch the next block */
1096 curr = (char *)prb_dispatch_next_block(pkc, po);
1098 pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
1099 prb_fill_curr_block(curr, pkc, pbd, len);
1100 return (void *)curr;
1104 * No free blocks are available.user_space hasn't caught up yet.
1105 * Queue was just frozen and now this packet will get dropped.
1110 static void *packet_current_rx_frame(struct packet_sock *po,
1111 struct sk_buff *skb,
1112 int status, unsigned int len)
1115 switch (po->tp_version) {
1118 curr = packet_lookup_frame(po, &po->rx_ring,
1119 po->rx_ring.head, status);
1122 return __packet_lookup_frame_in_block(po, skb, status, len);
1124 WARN(1, "TPACKET version not supported\n");
1130 static void *prb_lookup_block(struct packet_sock *po,
1131 struct packet_ring_buffer *rb,
1135 struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb);
1136 struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx);
1138 if (status != BLOCK_STATUS(pbd))
1143 static int prb_previous_blk_num(struct packet_ring_buffer *rb)
1146 if (rb->prb_bdqc.kactive_blk_num)
1147 prev = rb->prb_bdqc.kactive_blk_num-1;
1149 prev = rb->prb_bdqc.knum_blocks-1;
1153 /* Assumes caller has held the rx_queue.lock */
1154 static void *__prb_previous_block(struct packet_sock *po,
1155 struct packet_ring_buffer *rb,
1158 unsigned int previous = prb_previous_blk_num(rb);
1159 return prb_lookup_block(po, rb, previous, status);
1162 static void *packet_previous_rx_frame(struct packet_sock *po,
1163 struct packet_ring_buffer *rb,
1166 if (po->tp_version <= TPACKET_V2)
1167 return packet_previous_frame(po, rb, status);
1169 return __prb_previous_block(po, rb, status);
1172 static void packet_increment_rx_head(struct packet_sock *po,
1173 struct packet_ring_buffer *rb)
1175 switch (po->tp_version) {
1178 return packet_increment_head(rb);
1181 WARN(1, "TPACKET version not supported.\n");
1187 static void *packet_previous_frame(struct packet_sock *po,
1188 struct packet_ring_buffer *rb,
1191 unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
1192 return packet_lookup_frame(po, rb, previous, status);
1195 static void packet_increment_head(struct packet_ring_buffer *buff)
1197 buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
1200 static void packet_inc_pending(struct packet_ring_buffer *rb)
1202 this_cpu_inc(*rb->pending_refcnt);
1205 static void packet_dec_pending(struct packet_ring_buffer *rb)
1207 this_cpu_dec(*rb->pending_refcnt);
1210 static unsigned int packet_read_pending(const struct packet_ring_buffer *rb)
1212 unsigned int refcnt = 0;
1215 /* We don't use pending refcount in rx_ring. */
1216 if (rb->pending_refcnt == NULL)
1219 for_each_possible_cpu(cpu)
1220 refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu);
1225 static int packet_alloc_pending(struct packet_sock *po)
1227 po->rx_ring.pending_refcnt = NULL;
1229 po->tx_ring.pending_refcnt = alloc_percpu(unsigned int);
1230 if (unlikely(po->tx_ring.pending_refcnt == NULL))
1236 static void packet_free_pending(struct packet_sock *po)
1238 free_percpu(po->tx_ring.pending_refcnt);
1241 #define ROOM_POW_OFF 2
1242 #define ROOM_NONE 0x0
1243 #define ROOM_LOW 0x1
1244 #define ROOM_NORMAL 0x2
1246 static bool __tpacket_has_room(struct packet_sock *po, int pow_off)
1250 len = po->rx_ring.frame_max + 1;
1251 idx = po->rx_ring.head;
1253 idx += len >> pow_off;
1256 return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1259 static bool __tpacket_v3_has_room(struct packet_sock *po, int pow_off)
1263 len = po->rx_ring.prb_bdqc.knum_blocks;
1264 idx = po->rx_ring.prb_bdqc.kactive_blk_num;
1266 idx += len >> pow_off;
1269 return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL);
1272 static int __packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1274 struct sock *sk = &po->sk;
1275 int ret = ROOM_NONE;
1277 if (po->prot_hook.func != tpacket_rcv) {
1278 int avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc)
1279 - (skb ? skb->truesize : 0);
1280 if (avail > (sk->sk_rcvbuf >> ROOM_POW_OFF))
1288 if (po->tp_version == TPACKET_V3) {
1289 if (__tpacket_v3_has_room(po, ROOM_POW_OFF))
1291 else if (__tpacket_v3_has_room(po, 0))
1294 if (__tpacket_has_room(po, ROOM_POW_OFF))
1296 else if (__tpacket_has_room(po, 0))
1303 static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb)
1308 spin_lock_bh(&po->sk.sk_receive_queue.lock);
1309 ret = __packet_rcv_has_room(po, skb);
1310 has_room = ret == ROOM_NORMAL;
1311 if (po->pressure == has_room)
1312 po->pressure = !has_room;
1313 spin_unlock_bh(&po->sk.sk_receive_queue.lock);
1318 static void packet_sock_destruct(struct sock *sk)
1320 skb_queue_purge(&sk->sk_error_queue);
1322 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
1323 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
1325 if (!sock_flag(sk, SOCK_DEAD)) {
1326 pr_err("Attempt to release alive packet socket: %p\n", sk);
1330 sk_refcnt_debug_dec(sk);
1333 static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
1335 u32 *history = po->rollover->history;
1339 rxhash = skb_get_hash(skb);
1340 for (i = 0; i < ROLLOVER_HLEN; i++)
1341 if (READ_ONCE(history[i]) == rxhash)
1344 victim = prandom_u32() % ROLLOVER_HLEN;
1346 /* Avoid dirtying the cache line if possible */
1347 if (READ_ONCE(history[victim]) != rxhash)
1348 WRITE_ONCE(history[victim], rxhash);
1350 return count > (ROLLOVER_HLEN >> 1);
1353 static unsigned int fanout_demux_hash(struct packet_fanout *f,
1354 struct sk_buff *skb,
1357 return reciprocal_scale(__skb_get_hash_symmetric(skb), num);
1360 static unsigned int fanout_demux_lb(struct packet_fanout *f,
1361 struct sk_buff *skb,
1364 unsigned int val = atomic_inc_return(&f->rr_cur);
1369 static unsigned int fanout_demux_cpu(struct packet_fanout *f,
1370 struct sk_buff *skb,
1373 return smp_processor_id() % num;
1376 static unsigned int fanout_demux_rnd(struct packet_fanout *f,
1377 struct sk_buff *skb,
1380 return prandom_u32_max(num);
1383 static unsigned int fanout_demux_rollover(struct packet_fanout *f,
1384 struct sk_buff *skb,
1385 unsigned int idx, bool try_self,
1388 struct packet_sock *po, *po_next, *po_skip = NULL;
1389 unsigned int i, j, room = ROOM_NONE;
1391 po = pkt_sk(f->arr[idx]);
1394 room = packet_rcv_has_room(po, skb);
1395 if (room == ROOM_NORMAL ||
1396 (room == ROOM_LOW && !fanout_flow_is_huge(po, skb)))
1401 i = j = min_t(int, po->rollover->sock, num - 1);
1403 po_next = pkt_sk(f->arr[i]);
1404 if (po_next != po_skip && !po_next->pressure &&
1405 packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) {
1407 po->rollover->sock = i;
1408 atomic_long_inc(&po->rollover->num);
1409 if (room == ROOM_LOW)
1410 atomic_long_inc(&po->rollover->num_huge);
1418 atomic_long_inc(&po->rollover->num_failed);
1422 static unsigned int fanout_demux_qm(struct packet_fanout *f,
1423 struct sk_buff *skb,
1426 return skb_get_queue_mapping(skb) % num;
1429 static unsigned int fanout_demux_bpf(struct packet_fanout *f,
1430 struct sk_buff *skb,
1433 struct bpf_prog *prog;
1434 unsigned int ret = 0;
1437 prog = rcu_dereference(f->bpf_prog);
1439 ret = bpf_prog_run_clear_cb(prog, skb) % num;
1445 static bool fanout_has_flag(struct packet_fanout *f, u16 flag)
1447 return f->flags & (flag >> 8);
1450 static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
1451 struct packet_type *pt, struct net_device *orig_dev)
1453 struct packet_fanout *f = pt->af_packet_priv;
1454 unsigned int num = READ_ONCE(f->num_members);
1455 struct net *net = read_pnet(&f->net);
1456 struct packet_sock *po;
1459 if (!net_eq(dev_net(dev), net) || !num) {
1464 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) {
1465 skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET);
1470 case PACKET_FANOUT_HASH:
1472 idx = fanout_demux_hash(f, skb, num);
1474 case PACKET_FANOUT_LB:
1475 idx = fanout_demux_lb(f, skb, num);
1477 case PACKET_FANOUT_CPU:
1478 idx = fanout_demux_cpu(f, skb, num);
1480 case PACKET_FANOUT_RND:
1481 idx = fanout_demux_rnd(f, skb, num);
1483 case PACKET_FANOUT_QM:
1484 idx = fanout_demux_qm(f, skb, num);
1486 case PACKET_FANOUT_ROLLOVER:
1487 idx = fanout_demux_rollover(f, skb, 0, false, num);
1489 case PACKET_FANOUT_CBPF:
1490 case PACKET_FANOUT_EBPF:
1491 idx = fanout_demux_bpf(f, skb, num);
1495 if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER))
1496 idx = fanout_demux_rollover(f, skb, idx, true, num);
1498 po = pkt_sk(f->arr[idx]);
1499 return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
1502 DEFINE_MUTEX(fanout_mutex);
1503 EXPORT_SYMBOL_GPL(fanout_mutex);
1504 static LIST_HEAD(fanout_list);
1506 static void __fanout_link(struct sock *sk, struct packet_sock *po)
1508 struct packet_fanout *f = po->fanout;
1510 spin_lock(&f->lock);
1511 f->arr[f->num_members] = sk;
1514 if (f->num_members == 1)
1515 dev_add_pack(&f->prot_hook);
1516 spin_unlock(&f->lock);
1519 static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
1521 struct packet_fanout *f = po->fanout;
1524 spin_lock(&f->lock);
1525 for (i = 0; i < f->num_members; i++) {
1526 if (f->arr[i] == sk)
1529 BUG_ON(i >= f->num_members);
1530 f->arr[i] = f->arr[f->num_members - 1];
1532 if (f->num_members == 0)
1533 __dev_remove_pack(&f->prot_hook);
1534 spin_unlock(&f->lock);
1537 static bool match_fanout_group(struct packet_type *ptype, struct sock *sk)
1539 if (sk->sk_family != PF_PACKET)
1542 return ptype->af_packet_priv == pkt_sk(sk)->fanout;
1545 static void fanout_init_data(struct packet_fanout *f)
1548 case PACKET_FANOUT_LB:
1549 atomic_set(&f->rr_cur, 0);
1551 case PACKET_FANOUT_CBPF:
1552 case PACKET_FANOUT_EBPF:
1553 RCU_INIT_POINTER(f->bpf_prog, NULL);
1558 static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new)
1560 struct bpf_prog *old;
1562 spin_lock(&f->lock);
1563 old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock));
1564 rcu_assign_pointer(f->bpf_prog, new);
1565 spin_unlock(&f->lock);
1569 bpf_prog_destroy(old);
1573 static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
1576 struct bpf_prog *new;
1577 struct sock_fprog fprog;
1580 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1582 if (len != sizeof(fprog))
1584 if (copy_from_user(&fprog, data, len))
1587 ret = bpf_prog_create_from_user(&new, &fprog, NULL, false);
1591 __fanout_set_data_bpf(po->fanout, new);
1595 static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
1598 struct bpf_prog *new;
1601 if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
1603 if (len != sizeof(fd))
1605 if (copy_from_user(&fd, data, len))
1608 new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
1610 return PTR_ERR(new);
1612 __fanout_set_data_bpf(po->fanout, new);
1616 static int fanout_set_data(struct packet_sock *po, char __user *data,
1619 switch (po->fanout->type) {
1620 case PACKET_FANOUT_CBPF:
1621 return fanout_set_data_cbpf(po, data, len);
1622 case PACKET_FANOUT_EBPF:
1623 return fanout_set_data_ebpf(po, data, len);
1629 static void fanout_release_data(struct packet_fanout *f)
1632 case PACKET_FANOUT_CBPF:
1633 case PACKET_FANOUT_EBPF:
1634 __fanout_set_data_bpf(f, NULL);
1638 static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
1640 struct packet_rollover *rollover = NULL;
1641 struct packet_sock *po = pkt_sk(sk);
1642 struct packet_fanout *f, *match;
1643 u8 type = type_flags & 0xff;
1644 u8 flags = type_flags >> 8;
1648 case PACKET_FANOUT_ROLLOVER:
1649 if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)
1651 case PACKET_FANOUT_HASH:
1652 case PACKET_FANOUT_LB:
1653 case PACKET_FANOUT_CPU:
1654 case PACKET_FANOUT_RND:
1655 case PACKET_FANOUT_QM:
1656 case PACKET_FANOUT_CBPF:
1657 case PACKET_FANOUT_EBPF:
1663 mutex_lock(&fanout_mutex);
1669 if (type == PACKET_FANOUT_ROLLOVER ||
1670 (type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
1672 rollover = kzalloc(sizeof(*rollover), GFP_KERNEL);
1675 atomic_long_set(&rollover->num, 0);
1676 atomic_long_set(&rollover->num_huge, 0);
1677 atomic_long_set(&rollover->num_failed, 0);
1681 list_for_each_entry(f, &fanout_list, list) {
1683 read_pnet(&f->net) == sock_net(sk)) {
1689 if (match && match->flags != flags)
1693 match = kzalloc(sizeof(*match), GFP_KERNEL);
1696 write_pnet(&match->net, sock_net(sk));
1699 match->flags = flags;
1700 INIT_LIST_HEAD(&match->list);
1701 spin_lock_init(&match->lock);
1702 atomic_set(&match->sk_ref, 0);
1703 fanout_init_data(match);
1704 match->prot_hook.type = po->prot_hook.type;
1705 match->prot_hook.dev = po->prot_hook.dev;
1706 match->prot_hook.func = packet_rcv_fanout;
1707 match->prot_hook.af_packet_priv = match;
1708 match->prot_hook.af_packet_net = read_pnet(&match->net);
1709 match->prot_hook.id_match = match_fanout_group;
1710 list_add(&match->list, &fanout_list);
1714 spin_lock(&po->bind_lock);
1716 match->type == type &&
1717 match->prot_hook.type == po->prot_hook.type &&
1718 match->prot_hook.dev == po->prot_hook.dev) {
1720 if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
1721 __dev_remove_pack(&po->prot_hook);
1723 /* Paired with packet_setsockopt(PACKET_FANOUT_DATA) */
1724 WRITE_ONCE(po->fanout, match);
1726 po->rollover = rollover;
1728 atomic_inc(&match->sk_ref);
1729 __fanout_link(sk, po);
1733 spin_unlock(&po->bind_lock);
1735 if (err && !atomic_read(&match->sk_ref)) {
1736 list_del(&match->list);
1742 mutex_unlock(&fanout_mutex);
1746 /* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes
1747 * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout.
1748 * It is the responsibility of the caller to call fanout_release_data() and
1749 * free the returned packet_fanout (after synchronize_net())
1751 static struct packet_fanout *fanout_release(struct sock *sk)
1753 struct packet_sock *po = pkt_sk(sk);
1754 struct packet_fanout *f;
1756 mutex_lock(&fanout_mutex);
1761 if (atomic_dec_and_test(&f->sk_ref))
1766 mutex_unlock(&fanout_mutex);
1771 static bool packet_extra_vlan_len_allowed(const struct net_device *dev,
1772 struct sk_buff *skb)
1774 /* Earlier code assumed this would be a VLAN pkt, double-check
1775 * this now that we have the actual packet in hand. We can only
1776 * do this check on Ethernet devices.
1778 if (unlikely(dev->type != ARPHRD_ETHER))
1781 skb_reset_mac_header(skb);
1782 return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q));
1785 static const struct proto_ops packet_ops;
1787 static const struct proto_ops packet_ops_spkt;
1789 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
1790 struct packet_type *pt, struct net_device *orig_dev)
1793 struct sockaddr_pkt *spkt;
1796 * When we registered the protocol we saved the socket in the data
1797 * field for just this event.
1800 sk = pt->af_packet_priv;
1803 * Yank back the headers [hope the device set this
1804 * right or kerboom...]
1806 * Incoming packets have ll header pulled,
1809 * For outgoing ones skb->data == skb_mac_header(skb)
1810 * so that this procedure is noop.
1813 if (skb->pkt_type == PACKET_LOOPBACK)
1816 if (!net_eq(dev_net(dev), sock_net(sk)))
1819 skb = skb_share_check(skb, GFP_ATOMIC);
1823 /* drop any routing info */
1826 /* drop conntrack reference */
1829 spkt = &PACKET_SKB_CB(skb)->sa.pkt;
1831 skb_push(skb, skb->data - skb_mac_header(skb));
1834 * The SOCK_PACKET socket receives _all_ frames.
1837 spkt->spkt_family = dev->type;
1838 strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
1839 spkt->spkt_protocol = skb->protocol;
1842 * Charge the memory to the socket. This is done specifically
1843 * to prevent sockets using all the memory up.
1846 if (sock_queue_rcv_skb(sk, skb) == 0)
1857 * Output a raw packet to a device layer. This bypasses all the other
1858 * protocol layers and you must therefore supply it with a complete frame
1861 static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
1864 struct sock *sk = sock->sk;
1865 DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
1866 struct sk_buff *skb = NULL;
1867 struct net_device *dev;
1868 struct sockcm_cookie sockc;
1874 * Get and verify the address.
1878 if (msg->msg_namelen < sizeof(struct sockaddr))
1880 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
1881 proto = saddr->spkt_protocol;
1883 return -ENOTCONN; /* SOCK_PACKET must be sent giving an address */
1886 * Find the device first to size check it
1889 saddr->spkt_device[sizeof(saddr->spkt_device) - 1] = 0;
1892 dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
1898 if (!(dev->flags & IFF_UP))
1902 * You may not queue a frame bigger than the mtu. This is the lowest level
1903 * raw protocol and you must do your own fragmentation at this level.
1906 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
1907 if (!netif_supports_nofcs(dev)) {
1908 err = -EPROTONOSUPPORT;
1911 extra_len = 4; /* We're doing our own CRC */
1915 if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
1919 size_t reserved = LL_RESERVED_SPACE(dev);
1920 int tlen = dev->needed_tailroom;
1921 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
1924 skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
1927 /* FIXME: Save some space for broken drivers that write a hard
1928 * header at transmission time by themselves. PPP is the notable
1929 * one here. This should really be fixed at the driver level.
1931 skb_reserve(skb, reserved);
1932 skb_reset_network_header(skb);
1934 /* Try to align data part correctly */
1939 skb_reset_network_header(skb);
1941 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1947 if (!dev_validate_header(dev, skb->data, len)) {
1951 if (len > (dev->mtu + dev->hard_header_len + extra_len) &&
1952 !packet_extra_vlan_len_allowed(dev, skb)) {
1957 sockc.tsflags = sk->sk_tsflags;
1958 if (msg->msg_controllen) {
1959 err = sock_cmsg_send(sk, msg, &sockc);
1964 skb->protocol = proto;
1966 skb->priority = sk->sk_priority;
1967 skb->mark = sk->sk_mark;
1969 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
1971 if (unlikely(extra_len == 4))
1974 skb_probe_transport_header(skb, 0);
1976 dev_queue_xmit(skb);
1987 static unsigned int run_filter(struct sk_buff *skb,
1988 const struct sock *sk,
1991 struct sk_filter *filter;
1994 filter = rcu_dereference(sk->sk_filter);
1996 res = bpf_prog_run_clear_cb(filter->prog, skb);
2002 static int __packet_rcv_vnet(const struct sk_buff *skb,
2003 struct virtio_net_hdr *vnet_hdr)
2005 *vnet_hdr = (const struct virtio_net_hdr) { 0 };
2007 if (virtio_net_hdr_from_skb(skb, vnet_hdr, vio_le(), true))
2013 static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb,
2016 struct virtio_net_hdr vnet_hdr;
2018 if (*len < sizeof(vnet_hdr))
2020 *len -= sizeof(vnet_hdr);
2022 if (__packet_rcv_vnet(skb, &vnet_hdr))
2025 return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr));
2029 * This function makes lazy skb cloning in hope that most of packets
2030 * are discarded by BPF.
2032 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
2033 * and skb->cb are mangled. It works because (and until) packets
2034 * falling here are owned by current CPU. Output packets are cloned
2035 * by dev_queue_xmit_nit(), input packets are processed by net_bh
2036 * sequencially, so that if we return skb to original state on exit,
2037 * we will not harm anyone.
2040 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
2041 struct packet_type *pt, struct net_device *orig_dev)
2044 struct sockaddr_ll *sll;
2045 struct packet_sock *po;
2046 u8 *skb_head = skb->data;
2047 int skb_len = skb->len;
2048 unsigned int snaplen, res;
2049 bool is_drop_n_account = false;
2051 if (skb->pkt_type == PACKET_LOOPBACK)
2054 sk = pt->af_packet_priv;
2057 if (!net_eq(dev_net(dev), sock_net(sk)))
2062 if (dev->header_ops) {
2063 /* The device has an explicit notion of ll header,
2064 * exported to higher levels.
2066 * Otherwise, the device hides details of its frame
2067 * structure, so that corresponding packet head is
2068 * never delivered to user.
2070 if (sk->sk_type != SOCK_DGRAM)
2071 skb_push(skb, skb->data - skb_mac_header(skb));
2072 else if (skb->pkt_type == PACKET_OUTGOING) {
2073 /* Special case: outgoing packets have ll header at head */
2074 skb_pull(skb, skb_network_offset(skb));
2080 res = run_filter(skb, sk, snaplen);
2082 goto drop_n_restore;
2086 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
2089 if (skb_shared(skb)) {
2090 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
2094 if (skb_head != skb->data) {
2095 skb->data = skb_head;
2102 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8);
2104 sll = &PACKET_SKB_CB(skb)->sa.ll;
2105 sll->sll_hatype = dev->type;
2106 sll->sll_pkttype = skb->pkt_type;
2107 if (unlikely(po->origdev))
2108 sll->sll_ifindex = orig_dev->ifindex;
2110 sll->sll_ifindex = dev->ifindex;
2112 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2114 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2115 * Use their space for storing the original skb length.
2117 PACKET_SKB_CB(skb)->sa.origlen = skb->len;
2119 if (pskb_trim(skb, snaplen))
2122 skb_set_owner_r(skb, sk);
2126 /* drop conntrack reference */
2129 spin_lock(&sk->sk_receive_queue.lock);
2130 po->stats.stats1.tp_packets++;
2131 sock_skb_set_dropcount(sk, skb);
2132 __skb_queue_tail(&sk->sk_receive_queue, skb);
2133 spin_unlock(&sk->sk_receive_queue.lock);
2134 sk->sk_data_ready(sk);
2138 is_drop_n_account = true;
2139 spin_lock(&sk->sk_receive_queue.lock);
2140 po->stats.stats1.tp_drops++;
2141 atomic_inc(&sk->sk_drops);
2142 spin_unlock(&sk->sk_receive_queue.lock);
2145 if (skb_head != skb->data && skb_shared(skb)) {
2146 skb->data = skb_head;
2150 if (!is_drop_n_account)
2157 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
2158 struct packet_type *pt, struct net_device *orig_dev)
2161 struct packet_sock *po;
2162 struct sockaddr_ll *sll;
2163 union tpacket_uhdr h;
2164 u8 *skb_head = skb->data;
2165 int skb_len = skb->len;
2166 unsigned int snaplen, res;
2167 unsigned long status = TP_STATUS_USER;
2168 unsigned short macoff, hdrlen;
2169 unsigned int netoff;
2170 struct sk_buff *copy_skb = NULL;
2173 bool is_drop_n_account = false;
2174 bool do_vnet = false;
2176 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2177 * We may add members to them until current aligned size without forcing
2178 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2180 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
2181 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
2183 if (skb->pkt_type == PACKET_LOOPBACK)
2186 sk = pt->af_packet_priv;
2189 if (!net_eq(dev_net(dev), sock_net(sk)))
2192 if (dev->header_ops) {
2193 if (sk->sk_type != SOCK_DGRAM)
2194 skb_push(skb, skb->data - skb_mac_header(skb));
2195 else if (skb->pkt_type == PACKET_OUTGOING) {
2196 /* Special case: outgoing packets have ll header at head */
2197 skb_pull(skb, skb_network_offset(skb));
2203 res = run_filter(skb, sk, snaplen);
2205 goto drop_n_restore;
2207 if (skb->ip_summed == CHECKSUM_PARTIAL)
2208 status |= TP_STATUS_CSUMNOTREADY;
2209 else if (skb->pkt_type != PACKET_OUTGOING &&
2210 skb_csum_unnecessary(skb))
2211 status |= TP_STATUS_CSUM_VALID;
2216 if (sk->sk_type == SOCK_DGRAM) {
2217 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
2220 unsigned int maclen = skb_network_offset(skb);
2221 netoff = TPACKET_ALIGN(po->tp_hdrlen +
2222 (maclen < 16 ? 16 : maclen)) +
2224 if (po->has_vnet_hdr) {
2225 netoff += sizeof(struct virtio_net_hdr);
2228 macoff = netoff - maclen;
2230 if (netoff > USHRT_MAX) {
2231 spin_lock(&sk->sk_receive_queue.lock);
2232 po->stats.stats1.tp_drops++;
2233 spin_unlock(&sk->sk_receive_queue.lock);
2234 goto drop_n_restore;
2236 if (po->tp_version <= TPACKET_V2) {
2237 if (macoff + snaplen > po->rx_ring.frame_size) {
2238 if (po->copy_thresh &&
2239 atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
2240 if (skb_shared(skb)) {
2241 copy_skb = skb_clone(skb, GFP_ATOMIC);
2243 copy_skb = skb_get(skb);
2244 skb_head = skb->data;
2247 memset(&PACKET_SKB_CB(copy_skb)->sa.ll, 0,
2248 sizeof(PACKET_SKB_CB(copy_skb)->sa.ll));
2249 skb_set_owner_r(copy_skb, sk);
2252 snaplen = po->rx_ring.frame_size - macoff;
2253 if ((int)snaplen < 0) {
2258 } else if (unlikely(macoff + snaplen >
2259 GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
2262 nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
2263 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2264 snaplen, nval, macoff);
2266 if (unlikely((int)snaplen < 0)) {
2268 macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
2272 spin_lock(&sk->sk_receive_queue.lock);
2273 h.raw = packet_current_rx_frame(po, skb,
2274 TP_STATUS_KERNEL, (macoff+snaplen));
2276 goto drop_n_account;
2277 if (po->tp_version <= TPACKET_V2) {
2278 packet_increment_rx_head(po, &po->rx_ring);
2280 * LOSING will be reported till you read the stats,
2281 * because it's COR - Clear On Read.
2282 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2285 if (po->stats.stats1.tp_drops)
2286 status |= TP_STATUS_LOSING;
2290 __packet_rcv_vnet(skb, h.raw + macoff -
2291 sizeof(struct virtio_net_hdr)))
2292 goto drop_n_account;
2294 po->stats.stats1.tp_packets++;
2296 status |= TP_STATUS_COPY;
2297 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
2299 spin_unlock(&sk->sk_receive_queue.lock);
2301 skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
2303 if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
2304 getnstimeofday(&ts);
2306 status |= ts_status;
2308 switch (po->tp_version) {
2310 h.h1->tp_len = skb->len;
2311 h.h1->tp_snaplen = snaplen;
2312 h.h1->tp_mac = macoff;
2313 h.h1->tp_net = netoff;
2314 h.h1->tp_sec = ts.tv_sec;
2315 h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
2316 hdrlen = sizeof(*h.h1);
2319 h.h2->tp_len = skb->len;
2320 h.h2->tp_snaplen = snaplen;
2321 h.h2->tp_mac = macoff;
2322 h.h2->tp_net = netoff;
2323 h.h2->tp_sec = ts.tv_sec;
2324 h.h2->tp_nsec = ts.tv_nsec;
2325 if (skb_vlan_tag_present(skb)) {
2326 h.h2->tp_vlan_tci = skb_vlan_tag_get(skb);
2327 h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto);
2328 status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
2330 h.h2->tp_vlan_tci = 0;
2331 h.h2->tp_vlan_tpid = 0;
2333 memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding));
2334 hdrlen = sizeof(*h.h2);
2337 /* tp_nxt_offset,vlan are already populated above.
2338 * So DONT clear those fields here
2340 h.h3->tp_status |= status;
2341 h.h3->tp_len = skb->len;
2342 h.h3->tp_snaplen = snaplen;
2343 h.h3->tp_mac = macoff;
2344 h.h3->tp_net = netoff;
2345 h.h3->tp_sec = ts.tv_sec;
2346 h.h3->tp_nsec = ts.tv_nsec;
2347 memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding));
2348 hdrlen = sizeof(*h.h3);
2354 sll = h.raw + TPACKET_ALIGN(hdrlen);
2355 sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
2356 sll->sll_family = AF_PACKET;
2357 sll->sll_hatype = dev->type;
2358 sll->sll_protocol = skb->protocol;
2359 sll->sll_pkttype = skb->pkt_type;
2360 if (unlikely(po->origdev))
2361 sll->sll_ifindex = orig_dev->ifindex;
2363 sll->sll_ifindex = dev->ifindex;
2367 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2368 if (po->tp_version <= TPACKET_V2) {
2371 end = (u8 *) PAGE_ALIGN((unsigned long) h.raw +
2374 for (start = h.raw; start < end; start += PAGE_SIZE)
2375 flush_dcache_page(pgv_to_page(start));
2380 if (po->tp_version <= TPACKET_V2) {
2381 __packet_set_status(po, h.raw, status);
2382 sk->sk_data_ready(sk);
2384 prb_clear_blk_fill_status(&po->rx_ring);
2388 if (skb_head != skb->data && skb_shared(skb)) {
2389 skb->data = skb_head;
2393 if (!is_drop_n_account)
2400 is_drop_n_account = true;
2401 po->stats.stats1.tp_drops++;
2402 spin_unlock(&sk->sk_receive_queue.lock);
2404 sk->sk_data_ready(sk);
2405 kfree_skb(copy_skb);
2406 goto drop_n_restore;
2409 static void tpacket_destruct_skb(struct sk_buff *skb)
2411 struct packet_sock *po = pkt_sk(skb->sk);
2413 if (likely(po->tx_ring.pg_vec)) {
2417 ph = skb_shinfo(skb)->destructor_arg;
2418 packet_dec_pending(&po->tx_ring);
2420 ts = __packet_set_timestamp(po, ph, skb);
2421 __packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts);
2423 if (!packet_read_pending(&po->tx_ring))
2424 complete(&po->skb_completion);
2430 static void tpacket_set_protocol(const struct net_device *dev,
2431 struct sk_buff *skb)
2433 if (dev->type == ARPHRD_ETHER) {
2434 skb_reset_mac_header(skb);
2435 skb->protocol = eth_hdr(skb)->h_proto;
2439 static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len)
2441 unsigned short gso_type = 0;
2443 if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
2444 (__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2445 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 >
2446 __virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len)))
2447 vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(),
2448 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) +
2449 __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2);
2451 if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len)
2454 if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2455 switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2456 case VIRTIO_NET_HDR_GSO_TCPV4:
2457 gso_type = SKB_GSO_TCPV4;
2459 case VIRTIO_NET_HDR_GSO_TCPV6:
2460 gso_type = SKB_GSO_TCPV6;
2462 case VIRTIO_NET_HDR_GSO_UDP:
2463 gso_type = SKB_GSO_UDP;
2469 if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
2470 gso_type |= SKB_GSO_TCP_ECN;
2472 if (vnet_hdr->gso_size == 0)
2476 vnet_hdr->gso_type = gso_type; /* changes type, temporary storage */
2480 static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len,
2481 struct virtio_net_hdr *vnet_hdr)
2485 if (*len < sizeof(*vnet_hdr))
2487 *len -= sizeof(*vnet_hdr);
2489 n = copy_from_iter(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter);
2490 if (n != sizeof(*vnet_hdr))
2493 return __packet_snd_vnet_parse(vnet_hdr, *len);
2496 static int packet_snd_vnet_gso(struct sk_buff *skb,
2497 struct virtio_net_hdr *vnet_hdr)
2499 if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2500 u16 s = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_start);
2501 u16 o = __virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset);
2503 if (!skb_partial_csum_set(skb, s, o))
2507 skb_shinfo(skb)->gso_size =
2508 __virtio16_to_cpu(vio_le(), vnet_hdr->gso_size);
2509 skb_shinfo(skb)->gso_type = vnet_hdr->gso_type;
2511 /* Header must be checked, and gso_segs computed. */
2512 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2513 skb_shinfo(skb)->gso_segs = 0;
2517 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
2518 void *frame, struct net_device *dev, void *data, int tp_len,
2519 __be16 proto, unsigned char *addr, int hlen, int copylen,
2520 const struct sockcm_cookie *sockc)
2522 union tpacket_uhdr ph;
2523 int to_write, offset, len, nr_frags, len_max;
2524 struct socket *sock = po->sk.sk_socket;
2530 skb->protocol = proto;
2532 skb->priority = po->sk.sk_priority;
2533 skb->mark = po->sk.sk_mark;
2534 sock_tx_timestamp(&po->sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
2535 skb_shinfo(skb)->destructor_arg = ph.raw;
2537 skb_reserve(skb, hlen);
2538 skb_reset_network_header(skb);
2542 if (sock->type == SOCK_DGRAM) {
2543 err = dev_hard_header(skb, dev, ntohs(proto), addr,
2545 if (unlikely(err < 0))
2547 } else if (copylen) {
2548 int hdrlen = min_t(int, copylen, tp_len);
2550 skb_push(skb, dev->hard_header_len);
2551 skb_put(skb, copylen - dev->hard_header_len);
2552 err = skb_store_bits(skb, 0, data, hdrlen);
2555 if (!dev_validate_header(dev, skb->data, hdrlen))
2558 tpacket_set_protocol(dev, skb);
2564 offset = offset_in_page(data);
2565 len_max = PAGE_SIZE - offset;
2566 len = ((to_write > len_max) ? len_max : to_write);
2568 skb->data_len = to_write;
2569 skb->len += to_write;
2570 skb->truesize += to_write;
2571 atomic_add(to_write, &po->sk.sk_wmem_alloc);
2573 while (likely(to_write)) {
2574 nr_frags = skb_shinfo(skb)->nr_frags;
2576 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
2577 pr_err("Packet exceed the number of skb frags(%lu)\n",
2582 page = pgv_to_page(data);
2584 flush_dcache_page(page);
2586 skb_fill_page_desc(skb, nr_frags, page, offset, len);
2589 len_max = PAGE_SIZE;
2590 len = ((to_write > len_max) ? len_max : to_write);
2593 skb_probe_transport_header(skb, 0);
2598 static int tpacket_parse_header(struct packet_sock *po, void *frame,
2599 int size_max, void **data)
2601 union tpacket_uhdr ph;
2606 switch (po->tp_version) {
2608 tp_len = ph.h2->tp_len;
2611 tp_len = ph.h1->tp_len;
2614 if (unlikely(tp_len > size_max)) {
2615 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
2619 if (unlikely(po->tp_tx_has_off)) {
2620 int off_min, off_max;
2622 off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2623 off_max = po->tx_ring.frame_size - tp_len;
2624 if (po->sk.sk_type == SOCK_DGRAM) {
2625 switch (po->tp_version) {
2627 off = ph.h2->tp_net;
2630 off = ph.h1->tp_net;
2634 switch (po->tp_version) {
2636 off = ph.h2->tp_mac;
2639 off = ph.h1->tp_mac;
2643 if (unlikely((off < off_min) || (off_max < off)))
2646 off = po->tp_hdrlen - sizeof(struct sockaddr_ll);
2649 *data = frame + off;
2653 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
2655 struct sk_buff *skb = NULL;
2656 struct net_device *dev;
2657 struct virtio_net_hdr *vnet_hdr = NULL;
2658 struct sockcm_cookie sockc;
2660 int err, reserve = 0;
2662 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2663 bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
2664 unsigned char *addr = NULL;
2665 int tp_len, size_max;
2668 int status = TP_STATUS_AVAILABLE;
2669 int hlen, tlen, copylen = 0;
2672 mutex_lock(&po->pg_vec_lock);
2674 /* packet_sendmsg() check on tx_ring.pg_vec was lockless,
2675 * we need to confirm it under protection of pg_vec_lock.
2677 if (unlikely(!po->tx_ring.pg_vec)) {
2681 if (likely(saddr == NULL)) {
2682 dev = packet_cached_dev_get(po);
2683 proto = READ_ONCE(po->num);
2686 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2688 if (msg->msg_namelen < (saddr->sll_halen
2689 + offsetof(struct sockaddr_ll,
2692 proto = saddr->sll_protocol;
2693 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
2694 if (po->sk.sk_socket->type == SOCK_DGRAM) {
2695 if (dev && msg->msg_namelen < dev->addr_len +
2696 offsetof(struct sockaddr_ll, sll_addr))
2698 addr = saddr->sll_addr;
2703 if (unlikely(dev == NULL))
2706 if (unlikely(!(dev->flags & IFF_UP)))
2709 sockc.tsflags = po->sk.sk_tsflags;
2710 if (msg->msg_controllen) {
2711 err = sock_cmsg_send(&po->sk, msg, &sockc);
2716 if (po->sk.sk_socket->type == SOCK_RAW)
2717 reserve = dev->hard_header_len;
2718 size_max = po->tx_ring.frame_size
2719 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
2721 if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr)
2722 size_max = dev->mtu + reserve + VLAN_HLEN;
2724 reinit_completion(&po->skb_completion);
2727 ph = packet_current_frame(po, &po->tx_ring,
2728 TP_STATUS_SEND_REQUEST);
2729 if (unlikely(ph == NULL)) {
2730 if (need_wait && skb) {
2731 timeo = sock_sndtimeo(&po->sk, msg->msg_flags & MSG_DONTWAIT);
2732 timeo = wait_for_completion_interruptible_timeout(&po->skb_completion, timeo);
2734 err = !timeo ? -ETIMEDOUT : -ERESTARTSYS;
2738 /* check for additional frames */
2743 tp_len = tpacket_parse_header(po, ph, size_max, &data);
2747 status = TP_STATUS_SEND_REQUEST;
2748 hlen = LL_RESERVED_SPACE(dev);
2749 tlen = dev->needed_tailroom;
2750 if (po->has_vnet_hdr) {
2752 data += sizeof(*vnet_hdr);
2753 tp_len -= sizeof(*vnet_hdr);
2755 __packet_snd_vnet_parse(vnet_hdr, tp_len)) {
2759 copylen = __virtio16_to_cpu(vio_le(),
2762 copylen = max_t(int, copylen, dev->hard_header_len);
2763 skb = sock_alloc_send_skb(&po->sk,
2764 hlen + tlen + sizeof(struct sockaddr_ll) +
2765 (copylen - dev->hard_header_len),
2768 if (unlikely(skb == NULL)) {
2769 /* we assume the socket was initially writeable ... */
2770 if (likely(len_sum > 0))
2774 tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto,
2775 addr, hlen, copylen, &sockc);
2776 if (likely(tp_len >= 0) &&
2777 tp_len > dev->mtu + reserve &&
2778 !po->has_vnet_hdr &&
2779 !packet_extra_vlan_len_allowed(dev, skb))
2782 if (unlikely(tp_len < 0)) {
2785 __packet_set_status(po, ph,
2786 TP_STATUS_AVAILABLE);
2787 packet_increment_head(&po->tx_ring);
2791 status = TP_STATUS_WRONG_FORMAT;
2797 if (po->has_vnet_hdr && packet_snd_vnet_gso(skb, vnet_hdr)) {
2802 packet_pick_tx_queue(dev, skb);
2804 skb->destructor = tpacket_destruct_skb;
2805 __packet_set_status(po, ph, TP_STATUS_SENDING);
2806 packet_inc_pending(&po->tx_ring);
2808 status = TP_STATUS_SEND_REQUEST;
2809 err = po->xmit(skb);
2810 if (unlikely(err != 0)) {
2812 err = net_xmit_errno(err);
2813 if (err && __packet_get_status(po, ph) ==
2814 TP_STATUS_AVAILABLE) {
2815 /* skb was destructed already */
2820 * skb was dropped but not destructed yet;
2821 * let's treat it like congestion or err < 0
2825 packet_increment_head(&po->tx_ring);
2827 } while (likely((ph != NULL) ||
2828 /* Note: packet_read_pending() might be slow if we have
2829 * to call it as it's per_cpu variable, but in fast-path
2830 * we already short-circuit the loop with the first
2831 * condition, and luckily don't have to go that path
2834 (need_wait && packet_read_pending(&po->tx_ring))));
2840 __packet_set_status(po, ph, status);
2845 mutex_unlock(&po->pg_vec_lock);
2849 static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
2850 size_t reserve, size_t len,
2851 size_t linear, int noblock,
2854 struct sk_buff *skb;
2856 /* Under a page? Don't bother with paged skb. */
2857 if (prepad + len < PAGE_SIZE || !linear)
2860 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
2865 skb_reserve(skb, reserve);
2866 skb_put(skb, linear);
2867 skb->data_len = len - linear;
2868 skb->len += len - linear;
2873 static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
2875 struct sock *sk = sock->sk;
2876 DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
2877 struct sk_buff *skb;
2878 struct net_device *dev;
2880 unsigned char *addr = NULL;
2881 int err, reserve = 0;
2882 struct sockcm_cookie sockc;
2883 struct virtio_net_hdr vnet_hdr = { 0 };
2885 struct packet_sock *po = pkt_sk(sk);
2886 bool has_vnet_hdr = false;
2887 int hlen, tlen, linear;
2891 * Get and verify the address.
2894 if (likely(saddr == NULL)) {
2895 dev = packet_cached_dev_get(po);
2896 proto = READ_ONCE(po->num);
2899 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
2901 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
2903 proto = saddr->sll_protocol;
2904 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
2905 if (sock->type == SOCK_DGRAM) {
2906 if (dev && msg->msg_namelen < dev->addr_len +
2907 offsetof(struct sockaddr_ll, sll_addr))
2909 addr = saddr->sll_addr;
2914 if (unlikely(dev == NULL))
2917 if (unlikely(!(dev->flags & IFF_UP)))
2920 sockc.tsflags = sk->sk_tsflags;
2921 sockc.mark = sk->sk_mark;
2922 if (msg->msg_controllen) {
2923 err = sock_cmsg_send(sk, msg, &sockc);
2928 if (sock->type == SOCK_RAW)
2929 reserve = dev->hard_header_len;
2930 if (po->has_vnet_hdr) {
2931 err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
2934 has_vnet_hdr = true;
2937 if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
2938 if (!netif_supports_nofcs(dev)) {
2939 err = -EPROTONOSUPPORT;
2942 extra_len = 4; /* We're doing our own CRC */
2946 if (!vnet_hdr.gso_type &&
2947 (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
2951 hlen = LL_RESERVED_SPACE(dev);
2952 tlen = dev->needed_tailroom;
2953 linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len);
2954 linear = max(linear, min_t(int, len, dev->hard_header_len));
2955 skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear,
2956 msg->msg_flags & MSG_DONTWAIT, &err);
2960 skb_reset_network_header(skb);
2963 if (sock->type == SOCK_DGRAM) {
2964 offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
2965 if (unlikely(offset < 0))
2967 } else if (reserve) {
2968 skb_reserve(skb, -reserve);
2970 skb_reset_network_header(skb);
2973 /* Returns -EFAULT on error */
2974 err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
2978 if (sock->type == SOCK_RAW &&
2979 !dev_validate_header(dev, skb->data, len)) {
2984 sock_tx_timestamp(sk, sockc.tsflags, &skb_shinfo(skb)->tx_flags);
2986 if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) &&
2987 !packet_extra_vlan_len_allowed(dev, skb)) {
2992 skb->protocol = proto;
2994 skb->priority = sk->sk_priority;
2995 skb->mark = sockc.mark;
2997 packet_pick_tx_queue(dev, skb);
3000 err = packet_snd_vnet_gso(skb, &vnet_hdr);
3003 len += sizeof(vnet_hdr);
3006 skb_probe_transport_header(skb, reserve);
3008 if (unlikely(extra_len == 4))
3011 err = po->xmit(skb);
3012 if (unlikely(err != 0)) {
3014 err = net_xmit_errno(err);
3032 static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3034 struct sock *sk = sock->sk;
3035 struct packet_sock *po = pkt_sk(sk);
3037 if (po->tx_ring.pg_vec)
3038 return tpacket_snd(po, msg);
3040 return packet_snd(sock, msg, len);
3044 * Close a PACKET socket. This is fairly simple. We immediately go
3045 * to 'closed' state and remove our protocol entry in the device list.
3048 static int packet_release(struct socket *sock)
3050 struct sock *sk = sock->sk;
3051 struct packet_sock *po;
3052 struct packet_fanout *f;
3054 union tpacket_req_u req_u;
3062 mutex_lock(&net->packet.sklist_lock);
3063 sk_del_node_init_rcu(sk);
3064 mutex_unlock(&net->packet.sklist_lock);
3067 sock_prot_inuse_add(net, sk->sk_prot, -1);
3070 spin_lock(&po->bind_lock);
3071 unregister_prot_hook(sk, false);
3072 packet_cached_dev_reset(po);
3074 if (po->prot_hook.dev) {
3075 dev_put(po->prot_hook.dev);
3076 po->prot_hook.dev = NULL;
3078 spin_unlock(&po->bind_lock);
3080 packet_flush_mclist(sk);
3083 if (po->rx_ring.pg_vec) {
3084 memset(&req_u, 0, sizeof(req_u));
3085 packet_set_ring(sk, &req_u, 1, 0);
3088 if (po->tx_ring.pg_vec) {
3089 memset(&req_u, 0, sizeof(req_u));
3090 packet_set_ring(sk, &req_u, 1, 1);
3094 f = fanout_release(sk);
3099 kfree(po->rollover);
3100 fanout_release_data(f);
3104 * Now the socket is dead. No more input will appear.
3111 skb_queue_purge(&sk->sk_receive_queue);
3112 packet_free_pending(po);
3113 sk_refcnt_debug_release(sk);
3120 * Attach a packet hook.
3123 static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
3126 struct packet_sock *po = pkt_sk(sk);
3127 struct net_device *dev_curr;
3130 struct net_device *dev = NULL;
3132 bool unlisted = false;
3135 spin_lock(&po->bind_lock);
3144 dev = dev_get_by_name_rcu(sock_net(sk), name);
3149 } else if (ifindex) {
3150 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3160 proto_curr = po->prot_hook.type;
3161 dev_curr = po->prot_hook.dev;
3163 need_rehook = proto_curr != proto || dev_curr != dev;
3168 /* prevents packet_notifier() from calling
3169 * register_prot_hook()
3171 WRITE_ONCE(po->num, 0);
3172 __unregister_prot_hook(sk, true);
3174 dev_curr = po->prot_hook.dev;
3176 unlisted = !dev_get_by_index_rcu(sock_net(sk),
3180 BUG_ON(po->running);
3181 WRITE_ONCE(po->num, proto);
3182 po->prot_hook.type = proto;
3184 if (unlikely(unlisted)) {
3186 po->prot_hook.dev = NULL;
3187 WRITE_ONCE(po->ifindex, -1);
3188 packet_cached_dev_reset(po);
3190 po->prot_hook.dev = dev;
3191 WRITE_ONCE(po->ifindex, dev ? dev->ifindex : 0);
3192 packet_cached_dev_assign(po, dev);
3198 if (proto == 0 || !need_rehook)
3201 if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
3202 register_prot_hook(sk);
3204 sk->sk_err = ENETDOWN;
3205 if (!sock_flag(sk, SOCK_DEAD))
3206 sk->sk_error_report(sk);
3211 spin_unlock(&po->bind_lock);
3217 * Bind a packet socket to a device
3220 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
3223 struct sock *sk = sock->sk;
3224 char name[sizeof(uaddr->sa_data) + 1];
3230 if (addr_len != sizeof(struct sockaddr))
3232 /* uaddr->sa_data comes from the userspace, it's not guaranteed to be
3235 memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data));
3236 name[sizeof(uaddr->sa_data)] = 0;
3238 return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
3241 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
3243 struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
3244 struct sock *sk = sock->sk;
3250 if (addr_len < sizeof(struct sockaddr_ll))
3252 if (sll->sll_family != AF_PACKET)
3255 return packet_do_bind(sk, NULL, sll->sll_ifindex,
3256 sll->sll_protocol ? : pkt_sk(sk)->num);
3259 static struct proto packet_proto = {
3261 .owner = THIS_MODULE,
3262 .obj_size = sizeof(struct packet_sock),
3266 * Create a packet of type SOCK_PACKET.
3269 static int packet_create(struct net *net, struct socket *sock, int protocol,
3273 struct packet_sock *po;
3274 __be16 proto = (__force __be16)protocol; /* weird, but documented */
3277 if (!ns_capable(net->user_ns, CAP_NET_RAW))
3279 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
3280 sock->type != SOCK_PACKET)
3281 return -ESOCKTNOSUPPORT;
3283 sock->state = SS_UNCONNECTED;
3286 sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto, kern);
3290 sock->ops = &packet_ops;
3291 if (sock->type == SOCK_PACKET)
3292 sock->ops = &packet_ops_spkt;
3294 sock_init_data(sock, sk);
3297 init_completion(&po->skb_completion);
3298 sk->sk_family = PF_PACKET;
3300 po->xmit = dev_queue_xmit;
3302 err = packet_alloc_pending(po);
3306 packet_cached_dev_reset(po);
3308 sk->sk_destruct = packet_sock_destruct;
3309 sk_refcnt_debug_inc(sk);
3312 * Attach a protocol block
3315 spin_lock_init(&po->bind_lock);
3316 mutex_init(&po->pg_vec_lock);
3317 po->rollover = NULL;
3318 po->prot_hook.func = packet_rcv;
3320 if (sock->type == SOCK_PACKET)
3321 po->prot_hook.func = packet_rcv_spkt;
3323 po->prot_hook.af_packet_priv = sk;
3324 po->prot_hook.af_packet_net = sock_net(sk);
3327 po->prot_hook.type = proto;
3328 __register_prot_hook(sk);
3331 mutex_lock(&net->packet.sklist_lock);
3332 sk_add_node_tail_rcu(sk, &net->packet.sklist);
3333 mutex_unlock(&net->packet.sklist_lock);
3336 sock_prot_inuse_add(net, &packet_proto, 1);
3347 * Pull a packet from our receive queue and hand it to the user.
3348 * If necessary we block.
3351 static int packet_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3354 struct sock *sk = sock->sk;
3355 struct sk_buff *skb;
3357 int vnet_hdr_len = 0;
3358 unsigned int origlen = 0;
3361 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
3365 /* What error should we return now? EUNATTACH? */
3366 if (pkt_sk(sk)->ifindex < 0)
3370 if (flags & MSG_ERRQUEUE) {
3371 err = sock_recv_errqueue(sk, msg, len,
3372 SOL_PACKET, PACKET_TX_TIMESTAMP);
3377 * Call the generic datagram receiver. This handles all sorts
3378 * of horrible races and re-entrancy so we can forget about it
3379 * in the protocol layers.
3381 * Now it will return ENETDOWN, if device have just gone down,
3382 * but then it will block.
3385 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3388 * An error occurred so return it. Because skb_recv_datagram()
3389 * handles the blocking we don't see and worry about blocking
3396 if (pkt_sk(sk)->pressure)
3397 packet_rcv_has_room(pkt_sk(sk), NULL);
3399 if (pkt_sk(sk)->has_vnet_hdr) {
3400 err = packet_rcv_vnet(msg, skb, &len);
3403 vnet_hdr_len = sizeof(struct virtio_net_hdr);
3406 /* You lose any data beyond the buffer you gave. If it worries
3407 * a user program they can ask the device for its MTU
3413 msg->msg_flags |= MSG_TRUNC;
3416 err = skb_copy_datagram_msg(skb, 0, msg, copied);
3420 if (sock->type != SOCK_PACKET) {
3421 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3423 /* Original length was stored in sockaddr_ll fields */
3424 origlen = PACKET_SKB_CB(skb)->sa.origlen;
3425 sll->sll_family = AF_PACKET;
3426 sll->sll_protocol = skb->protocol;
3429 sock_recv_ts_and_drops(msg, sk, skb);
3431 if (msg->msg_name) {
3432 const size_t max_len = min(sizeof(skb->cb),
3433 sizeof(struct sockaddr_storage));
3436 /* If the address length field is there to be filled
3437 * in, we fill it in now.
3439 if (sock->type == SOCK_PACKET) {
3440 __sockaddr_check_size(sizeof(struct sockaddr_pkt));
3441 msg->msg_namelen = sizeof(struct sockaddr_pkt);
3442 copy_len = msg->msg_namelen;
3444 struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
3446 msg->msg_namelen = sll->sll_halen +
3447 offsetof(struct sockaddr_ll, sll_addr);
3448 copy_len = msg->msg_namelen;
3449 if (msg->msg_namelen < sizeof(struct sockaddr_ll)) {
3450 memset(msg->msg_name +
3451 offsetof(struct sockaddr_ll, sll_addr),
3452 0, sizeof(sll->sll_addr));
3453 msg->msg_namelen = sizeof(struct sockaddr_ll);
3456 if (WARN_ON_ONCE(copy_len > max_len)) {
3458 msg->msg_namelen = copy_len;
3460 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, copy_len);
3463 if (pkt_sk(sk)->auxdata) {
3464 struct tpacket_auxdata aux;
3466 aux.tp_status = TP_STATUS_USER;
3467 if (skb->ip_summed == CHECKSUM_PARTIAL)
3468 aux.tp_status |= TP_STATUS_CSUMNOTREADY;
3469 else if (skb->pkt_type != PACKET_OUTGOING &&
3470 skb_csum_unnecessary(skb))
3471 aux.tp_status |= TP_STATUS_CSUM_VALID;
3473 aux.tp_len = origlen;
3474 aux.tp_snaplen = skb->len;
3476 aux.tp_net = skb_network_offset(skb);
3477 if (skb_vlan_tag_present(skb)) {
3478 aux.tp_vlan_tci = skb_vlan_tag_get(skb);
3479 aux.tp_vlan_tpid = ntohs(skb->vlan_proto);
3480 aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID;
3482 aux.tp_vlan_tci = 0;
3483 aux.tp_vlan_tpid = 0;
3485 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
3489 * Free or return the buffer as appropriate. Again this
3490 * hides all the races and re-entrancy issues from us.
3492 err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
3495 skb_free_datagram(sk, skb);
3500 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
3501 int *uaddr_len, int peer)
3503 struct net_device *dev;
3504 struct sock *sk = sock->sk;
3509 uaddr->sa_family = AF_PACKET;
3510 memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
3512 dev = dev_get_by_index_rcu(sock_net(sk), READ_ONCE(pkt_sk(sk)->ifindex));
3514 strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
3516 *uaddr_len = sizeof(*uaddr);
3521 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
3522 int *uaddr_len, int peer)
3524 struct net_device *dev;
3525 struct sock *sk = sock->sk;
3526 struct packet_sock *po = pkt_sk(sk);
3527 DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
3533 ifindex = READ_ONCE(po->ifindex);
3534 sll->sll_family = AF_PACKET;
3535 sll->sll_ifindex = ifindex;
3536 sll->sll_protocol = READ_ONCE(po->num);
3537 sll->sll_pkttype = 0;
3539 dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
3541 sll->sll_hatype = dev->type;
3542 sll->sll_halen = dev->addr_len;
3543 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
3545 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
3549 *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
3554 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
3558 case PACKET_MR_MULTICAST:
3559 if (i->alen != dev->addr_len)
3562 return dev_mc_add(dev, i->addr);
3564 return dev_mc_del(dev, i->addr);
3566 case PACKET_MR_PROMISC:
3567 return dev_set_promiscuity(dev, what);
3568 case PACKET_MR_ALLMULTI:
3569 return dev_set_allmulti(dev, what);
3570 case PACKET_MR_UNICAST:
3571 if (i->alen != dev->addr_len)
3574 return dev_uc_add(dev, i->addr);
3576 return dev_uc_del(dev, i->addr);
3584 static void packet_dev_mclist_delete(struct net_device *dev,
3585 struct packet_mclist **mlp)
3587 struct packet_mclist *ml;
3589 while ((ml = *mlp) != NULL) {
3590 if (ml->ifindex == dev->ifindex) {
3591 packet_dev_mc(dev, ml, -1);
3599 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
3601 struct packet_sock *po = pkt_sk(sk);
3602 struct packet_mclist *ml, *i;
3603 struct net_device *dev;
3609 dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
3614 if (mreq->mr_alen > dev->addr_len)
3618 i = kmalloc(sizeof(*i), GFP_KERNEL);
3623 for (ml = po->mclist; ml; ml = ml->next) {
3624 if (ml->ifindex == mreq->mr_ifindex &&
3625 ml->type == mreq->mr_type &&
3626 ml->alen == mreq->mr_alen &&
3627 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3629 /* Free the new element ... */
3635 i->type = mreq->mr_type;
3636 i->ifindex = mreq->mr_ifindex;
3637 i->alen = mreq->mr_alen;
3638 memcpy(i->addr, mreq->mr_address, i->alen);
3639 memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
3641 i->next = po->mclist;
3643 err = packet_dev_mc(dev, i, 1);
3645 po->mclist = i->next;
3654 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
3656 struct packet_mclist *ml, **mlp;
3660 for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
3661 if (ml->ifindex == mreq->mr_ifindex &&
3662 ml->type == mreq->mr_type &&
3663 ml->alen == mreq->mr_alen &&
3664 memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
3665 if (--ml->count == 0) {
3666 struct net_device *dev;
3668 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3670 packet_dev_mc(dev, ml, -1);
3680 static void packet_flush_mclist(struct sock *sk)
3682 struct packet_sock *po = pkt_sk(sk);
3683 struct packet_mclist *ml;
3689 while ((ml = po->mclist) != NULL) {
3690 struct net_device *dev;
3692 po->mclist = ml->next;
3693 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
3695 packet_dev_mc(dev, ml, -1);
3702 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
3704 struct sock *sk = sock->sk;
3705 struct packet_sock *po = pkt_sk(sk);
3708 if (level != SOL_PACKET)
3709 return -ENOPROTOOPT;
3712 case PACKET_ADD_MEMBERSHIP:
3713 case PACKET_DROP_MEMBERSHIP:
3715 struct packet_mreq_max mreq;
3717 memset(&mreq, 0, sizeof(mreq));
3718 if (len < sizeof(struct packet_mreq))
3720 if (len > sizeof(mreq))
3722 if (copy_from_user(&mreq, optval, len))
3724 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
3726 if (optname == PACKET_ADD_MEMBERSHIP)
3727 ret = packet_mc_add(sk, &mreq);
3729 ret = packet_mc_drop(sk, &mreq);
3733 case PACKET_RX_RING:
3734 case PACKET_TX_RING:
3736 union tpacket_req_u req_u;
3740 switch (po->tp_version) {
3743 len = sizeof(req_u.req);
3747 len = sizeof(req_u.req3);
3753 if (copy_from_user(&req_u.req, optval, len))
3756 ret = packet_set_ring(sk, &req_u, 0,
3757 optname == PACKET_TX_RING);
3762 case PACKET_COPY_THRESH:
3766 if (optlen != sizeof(val))
3768 if (copy_from_user(&val, optval, sizeof(val)))
3771 pkt_sk(sk)->copy_thresh = val;
3774 case PACKET_VERSION:
3778 if (optlen != sizeof(val))
3780 if (copy_from_user(&val, optval, sizeof(val)))
3791 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3794 po->tp_version = val;
3800 case PACKET_RESERVE:
3804 if (optlen != sizeof(val))
3806 if (copy_from_user(&val, optval, sizeof(val)))
3811 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3814 po->tp_reserve = val;
3824 if (optlen != sizeof(val))
3826 if (copy_from_user(&val, optval, sizeof(val)))
3830 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3833 po->tp_loss = !!val;
3839 case PACKET_AUXDATA:
3843 if (optlen < sizeof(val))
3845 if (copy_from_user(&val, optval, sizeof(val)))
3849 po->auxdata = !!val;
3853 case PACKET_ORIGDEV:
3857 if (optlen < sizeof(val))
3859 if (copy_from_user(&val, optval, sizeof(val)))
3863 po->origdev = !!val;
3867 case PACKET_VNET_HDR:
3871 if (sock->type != SOCK_RAW)
3873 if (optlen < sizeof(val))
3875 if (copy_from_user(&val, optval, sizeof(val)))
3879 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3882 po->has_vnet_hdr = !!val;
3888 case PACKET_TIMESTAMP:
3892 if (optlen != sizeof(val))
3894 if (copy_from_user(&val, optval, sizeof(val)))
3897 po->tp_tstamp = val;
3904 if (optlen != sizeof(val))
3906 if (copy_from_user(&val, optval, sizeof(val)))
3909 return fanout_add(sk, val & 0xffff, val >> 16);
3911 case PACKET_FANOUT_DATA:
3913 /* Paired with the WRITE_ONCE() in fanout_add() */
3914 if (!READ_ONCE(po->fanout))
3917 return fanout_set_data(po, optval, optlen);
3919 case PACKET_TX_HAS_OFF:
3923 if (optlen != sizeof(val))
3925 if (copy_from_user(&val, optval, sizeof(val)))
3929 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
3932 po->tp_tx_has_off = !!val;
3938 case PACKET_QDISC_BYPASS:
3942 if (optlen != sizeof(val))
3944 if (copy_from_user(&val, optval, sizeof(val)))
3947 po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
3951 return -ENOPROTOOPT;
3955 static int packet_getsockopt(struct socket *sock, int level, int optname,
3956 char __user *optval, int __user *optlen)
3959 int val, lv = sizeof(val);
3960 struct sock *sk = sock->sk;
3961 struct packet_sock *po = pkt_sk(sk);
3963 union tpacket_stats_u st;
3964 struct tpacket_rollover_stats rstats;
3966 if (level != SOL_PACKET)
3967 return -ENOPROTOOPT;
3969 if (get_user(len, optlen))
3976 case PACKET_STATISTICS:
3977 spin_lock_bh(&sk->sk_receive_queue.lock);
3978 memcpy(&st, &po->stats, sizeof(st));
3979 memset(&po->stats, 0, sizeof(po->stats));
3980 spin_unlock_bh(&sk->sk_receive_queue.lock);
3982 if (po->tp_version == TPACKET_V3) {
3983 lv = sizeof(struct tpacket_stats_v3);
3984 st.stats3.tp_packets += st.stats3.tp_drops;
3987 lv = sizeof(struct tpacket_stats);
3988 st.stats1.tp_packets += st.stats1.tp_drops;
3993 case PACKET_AUXDATA:
3996 case PACKET_ORIGDEV:
3999 case PACKET_VNET_HDR:
4000 val = po->has_vnet_hdr;
4002 case PACKET_VERSION:
4003 val = po->tp_version;
4006 if (len > sizeof(int))
4008 if (len < sizeof(int))
4010 if (copy_from_user(&val, optval, len))
4014 val = sizeof(struct tpacket_hdr);
4017 val = sizeof(struct tpacket2_hdr);
4020 val = sizeof(struct tpacket3_hdr);
4026 case PACKET_RESERVE:
4027 val = po->tp_reserve;
4032 case PACKET_TIMESTAMP:
4033 val = po->tp_tstamp;
4037 ((u32)po->fanout->id |
4038 ((u32)po->fanout->type << 16) |
4039 ((u32)po->fanout->flags << 24)) :
4042 case PACKET_ROLLOVER_STATS:
4045 rstats.tp_all = atomic_long_read(&po->rollover->num);
4046 rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
4047 rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
4049 lv = sizeof(rstats);
4051 case PACKET_TX_HAS_OFF:
4052 val = po->tp_tx_has_off;
4054 case PACKET_QDISC_BYPASS:
4055 val = packet_use_direct_xmit(po);
4058 return -ENOPROTOOPT;
4063 if (put_user(len, optlen))
4065 if (copy_to_user(optval, data, len))
4071 #ifdef CONFIG_COMPAT
4072 static int compat_packet_setsockopt(struct socket *sock, int level, int optname,
4073 char __user *optval, unsigned int optlen)
4075 struct packet_sock *po = pkt_sk(sock->sk);
4077 if (level != SOL_PACKET)
4078 return -ENOPROTOOPT;
4080 if (optname == PACKET_FANOUT_DATA &&
4081 po->fanout && po->fanout->type == PACKET_FANOUT_CBPF) {
4082 optval = (char __user *)get_compat_bpf_fprog(optval);
4085 optlen = sizeof(struct sock_fprog);
4088 return packet_setsockopt(sock, level, optname, optval, optlen);
4092 static int packet_notifier(struct notifier_block *this,
4093 unsigned long msg, void *ptr)
4096 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4097 struct net *net = dev_net(dev);
4100 sk_for_each_rcu(sk, &net->packet.sklist) {
4101 struct packet_sock *po = pkt_sk(sk);
4104 case NETDEV_UNREGISTER:
4106 packet_dev_mclist_delete(dev, &po->mclist);
4110 if (dev->ifindex == po->ifindex) {
4111 spin_lock(&po->bind_lock);
4113 __unregister_prot_hook(sk, false);
4114 sk->sk_err = ENETDOWN;
4115 if (!sock_flag(sk, SOCK_DEAD))
4116 sk->sk_error_report(sk);
4118 if (msg == NETDEV_UNREGISTER) {
4119 packet_cached_dev_reset(po);
4120 WRITE_ONCE(po->ifindex, -1);
4121 if (po->prot_hook.dev)
4122 dev_put(po->prot_hook.dev);
4123 po->prot_hook.dev = NULL;
4125 spin_unlock(&po->bind_lock);
4129 if (dev->ifindex == po->ifindex) {
4130 spin_lock(&po->bind_lock);
4132 register_prot_hook(sk);
4133 spin_unlock(&po->bind_lock);
4143 static int packet_ioctl(struct socket *sock, unsigned int cmd,
4146 struct sock *sk = sock->sk;
4151 int amount = sk_wmem_alloc_get(sk);
4153 return put_user(amount, (int __user *)arg);
4157 struct sk_buff *skb;
4160 spin_lock_bh(&sk->sk_receive_queue.lock);
4161 skb = skb_peek(&sk->sk_receive_queue);
4164 spin_unlock_bh(&sk->sk_receive_queue.lock);
4165 return put_user(amount, (int __user *)arg);
4168 return sock_get_timestamp(sk, (struct timeval __user *)arg);
4170 return sock_get_timestampns(sk, (struct timespec __user *)arg);
4180 case SIOCGIFBRDADDR:
4181 case SIOCSIFBRDADDR:
4182 case SIOCGIFNETMASK:
4183 case SIOCSIFNETMASK:
4184 case SIOCGIFDSTADDR:
4185 case SIOCSIFDSTADDR:
4187 return inet_dgram_ops.ioctl(sock, cmd, arg);
4191 return -ENOIOCTLCMD;
4196 static unsigned int packet_poll(struct file *file, struct socket *sock,
4199 struct sock *sk = sock->sk;
4200 struct packet_sock *po = pkt_sk(sk);
4201 unsigned int mask = datagram_poll(file, sock, wait);
4203 spin_lock_bh(&sk->sk_receive_queue.lock);
4204 if (po->rx_ring.pg_vec) {
4205 if (!packet_previous_rx_frame(po, &po->rx_ring,
4207 mask |= POLLIN | POLLRDNORM;
4209 if (po->pressure && __packet_rcv_has_room(po, NULL) == ROOM_NORMAL)
4211 spin_unlock_bh(&sk->sk_receive_queue.lock);
4212 spin_lock_bh(&sk->sk_write_queue.lock);
4213 if (po->tx_ring.pg_vec) {
4214 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
4215 mask |= POLLOUT | POLLWRNORM;
4217 spin_unlock_bh(&sk->sk_write_queue.lock);
4222 /* Dirty? Well, I still did not learn better way to account
4226 static void packet_mm_open(struct vm_area_struct *vma)
4228 struct file *file = vma->vm_file;
4229 struct socket *sock = file->private_data;
4230 struct sock *sk = sock->sk;
4233 atomic_inc(&pkt_sk(sk)->mapped);
4236 static void packet_mm_close(struct vm_area_struct *vma)
4238 struct file *file = vma->vm_file;
4239 struct socket *sock = file->private_data;
4240 struct sock *sk = sock->sk;
4243 atomic_dec(&pkt_sk(sk)->mapped);
4246 static const struct vm_operations_struct packet_mmap_ops = {
4247 .open = packet_mm_open,
4248 .close = packet_mm_close,
4251 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
4256 for (i = 0; i < len; i++) {
4257 if (likely(pg_vec[i].buffer)) {
4258 if (is_vmalloc_addr(pg_vec[i].buffer))
4259 vfree(pg_vec[i].buffer);
4261 free_pages((unsigned long)pg_vec[i].buffer,
4263 pg_vec[i].buffer = NULL;
4269 static char *alloc_one_pg_vec_page(unsigned long order)
4272 gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
4273 __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
4275 buffer = (char *) __get_free_pages(gfp_flags, order);
4279 /* __get_free_pages failed, fall back to vmalloc */
4280 buffer = vzalloc((1 << order) * PAGE_SIZE);
4284 /* vmalloc failed, lets dig into swap here */
4285 gfp_flags &= ~__GFP_NORETRY;
4286 buffer = (char *) __get_free_pages(gfp_flags, order);
4290 /* complete and utter failure */
4294 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
4296 unsigned int block_nr = req->tp_block_nr;
4300 pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL | __GFP_NOWARN);
4301 if (unlikely(!pg_vec))
4304 for (i = 0; i < block_nr; i++) {
4305 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
4306 if (unlikely(!pg_vec[i].buffer))
4307 goto out_free_pgvec;
4314 free_pg_vec(pg_vec, order, block_nr);
4319 static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
4320 int closing, int tx_ring)
4322 struct pgv *pg_vec = NULL;
4323 struct packet_sock *po = pkt_sk(sk);
4324 int was_running, order = 0;
4325 struct packet_ring_buffer *rb;
4326 struct sk_buff_head *rb_queue;
4329 /* Added to avoid minimal code churn */
4330 struct tpacket_req *req = &req_u->req;
4332 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
4333 if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
4334 net_warn_ratelimited("Tx-ring is not supported.\n");
4338 rb = tx_ring ? &po->tx_ring : &po->rx_ring;
4339 rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
4343 if (atomic_read(&po->mapped))
4345 if (packet_read_pending(rb))
4349 if (req->tp_block_nr) {
4350 unsigned int min_frame_size;
4352 /* Sanity tests and some calculations */
4354 if (unlikely(rb->pg_vec))
4357 switch (po->tp_version) {
4359 po->tp_hdrlen = TPACKET_HDRLEN;
4362 po->tp_hdrlen = TPACKET2_HDRLEN;
4365 po->tp_hdrlen = TPACKET3_HDRLEN;
4370 if (unlikely((int)req->tp_block_size <= 0))
4372 if (unlikely(!PAGE_ALIGNED(req->tp_block_size)))
4374 min_frame_size = po->tp_hdrlen + po->tp_reserve;
4375 if (po->tp_version >= TPACKET_V3 &&
4376 req->tp_block_size <
4377 BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv) + min_frame_size)
4379 if (unlikely(req->tp_frame_size < min_frame_size))
4381 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
4384 rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
4385 if (unlikely(rb->frames_per_block == 0))
4387 if (unlikely(rb->frames_per_block > UINT_MAX / req->tp_block_nr))
4389 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
4394 order = get_order(req->tp_block_size);
4395 pg_vec = alloc_pg_vec(req, order);
4396 if (unlikely(!pg_vec))
4398 switch (po->tp_version) {
4400 /* Transmit path is not supported. We checked
4401 * it above but just being paranoid
4404 init_prb_bdqc(po, rb, pg_vec, req_u);
4413 if (unlikely(req->tp_frame_nr))
4418 /* Detach socket from network */
4419 spin_lock(&po->bind_lock);
4420 was_running = po->running;
4423 WRITE_ONCE(po->num, 0);
4424 __unregister_prot_hook(sk, false);
4426 spin_unlock(&po->bind_lock);
4431 mutex_lock(&po->pg_vec_lock);
4432 if (closing || atomic_read(&po->mapped) == 0) {
4434 spin_lock_bh(&rb_queue->lock);
4435 swap(rb->pg_vec, pg_vec);
4436 rb->frame_max = (req->tp_frame_nr - 1);
4438 rb->frame_size = req->tp_frame_size;
4439 spin_unlock_bh(&rb_queue->lock);
4441 swap(rb->pg_vec_order, order);
4442 swap(rb->pg_vec_len, req->tp_block_nr);
4444 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
4445 po->prot_hook.func = (po->rx_ring.pg_vec) ?
4446 tpacket_rcv : packet_rcv;
4447 skb_queue_purge(rb_queue);
4448 if (atomic_read(&po->mapped))
4449 pr_err("packet_mmap: vma is busy: %d\n",
4450 atomic_read(&po->mapped));
4452 mutex_unlock(&po->pg_vec_lock);
4454 spin_lock(&po->bind_lock);
4456 WRITE_ONCE(po->num, num);
4457 register_prot_hook(sk);
4459 spin_unlock(&po->bind_lock);
4460 if (pg_vec && (po->tp_version > TPACKET_V2)) {
4461 /* Because we don't support block-based V3 on tx-ring */
4463 prb_shutdown_retire_blk_timer(po, rb_queue);
4467 free_pg_vec(pg_vec, order, req->tp_block_nr);
4472 static int packet_mmap(struct file *file, struct socket *sock,
4473 struct vm_area_struct *vma)
4475 struct sock *sk = sock->sk;
4476 struct packet_sock *po = pkt_sk(sk);
4477 unsigned long size, expected_size;
4478 struct packet_ring_buffer *rb;
4479 unsigned long start;
4486 mutex_lock(&po->pg_vec_lock);
4489 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4491 expected_size += rb->pg_vec_len
4497 if (expected_size == 0)
4500 size = vma->vm_end - vma->vm_start;
4501 if (size != expected_size)
4504 start = vma->vm_start;
4505 for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
4506 if (rb->pg_vec == NULL)
4509 for (i = 0; i < rb->pg_vec_len; i++) {
4511 void *kaddr = rb->pg_vec[i].buffer;
4514 for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
4515 page = pgv_to_page(kaddr);
4516 err = vm_insert_page(vma, start, page);
4525 atomic_inc(&po->mapped);
4526 vma->vm_ops = &packet_mmap_ops;
4530 mutex_unlock(&po->pg_vec_lock);
4534 static const struct proto_ops packet_ops_spkt = {
4535 .family = PF_PACKET,
4536 .owner = THIS_MODULE,
4537 .release = packet_release,
4538 .bind = packet_bind_spkt,
4539 .connect = sock_no_connect,
4540 .socketpair = sock_no_socketpair,
4541 .accept = sock_no_accept,
4542 .getname = packet_getname_spkt,
4543 .poll = datagram_poll,
4544 .ioctl = packet_ioctl,
4545 .listen = sock_no_listen,
4546 .shutdown = sock_no_shutdown,
4547 .setsockopt = sock_no_setsockopt,
4548 .getsockopt = sock_no_getsockopt,
4549 .sendmsg = packet_sendmsg_spkt,
4550 .recvmsg = packet_recvmsg,
4551 .mmap = sock_no_mmap,
4552 .sendpage = sock_no_sendpage,
4555 static const struct proto_ops packet_ops = {
4556 .family = PF_PACKET,
4557 .owner = THIS_MODULE,
4558 .release = packet_release,
4559 .bind = packet_bind,
4560 .connect = sock_no_connect,
4561 .socketpair = sock_no_socketpair,
4562 .accept = sock_no_accept,
4563 .getname = packet_getname,
4564 .poll = packet_poll,
4565 .ioctl = packet_ioctl,
4566 .listen = sock_no_listen,
4567 .shutdown = sock_no_shutdown,
4568 .setsockopt = packet_setsockopt,
4569 .getsockopt = packet_getsockopt,
4570 #ifdef CONFIG_COMPAT
4571 .compat_setsockopt = compat_packet_setsockopt,
4573 .sendmsg = packet_sendmsg,
4574 .recvmsg = packet_recvmsg,
4575 .mmap = packet_mmap,
4576 .sendpage = sock_no_sendpage,
4579 static const struct net_proto_family packet_family_ops = {
4580 .family = PF_PACKET,
4581 .create = packet_create,
4582 .owner = THIS_MODULE,
4585 static struct notifier_block packet_netdev_notifier = {
4586 .notifier_call = packet_notifier,
4589 #ifdef CONFIG_PROC_FS
4591 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
4594 struct net *net = seq_file_net(seq);
4597 return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
4600 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4602 struct net *net = seq_file_net(seq);
4603 return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
4606 static void packet_seq_stop(struct seq_file *seq, void *v)
4612 static int packet_seq_show(struct seq_file *seq, void *v)
4614 if (v == SEQ_START_TOKEN)
4615 seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4617 struct sock *s = sk_entry(v);
4618 const struct packet_sock *po = pkt_sk(s);
4621 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4623 atomic_read(&s->sk_refcnt),
4625 ntohs(READ_ONCE(po->num)),
4626 READ_ONCE(po->ifindex),
4628 atomic_read(&s->sk_rmem_alloc),
4629 from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),
4636 static const struct seq_operations packet_seq_ops = {
4637 .start = packet_seq_start,
4638 .next = packet_seq_next,
4639 .stop = packet_seq_stop,
4640 .show = packet_seq_show,
4643 static int packet_seq_open(struct inode *inode, struct file *file)
4645 return seq_open_net(inode, file, &packet_seq_ops,
4646 sizeof(struct seq_net_private));
4649 static const struct file_operations packet_seq_fops = {
4650 .owner = THIS_MODULE,
4651 .open = packet_seq_open,
4653 .llseek = seq_lseek,
4654 .release = seq_release_net,
4659 static int __net_init packet_net_init(struct net *net)
4661 mutex_init(&net->packet.sklist_lock);
4662 INIT_HLIST_HEAD(&net->packet.sklist);
4664 if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
4670 static void __net_exit packet_net_exit(struct net *net)
4672 remove_proc_entry("packet", net->proc_net);
4675 static struct pernet_operations packet_net_ops = {
4676 .init = packet_net_init,
4677 .exit = packet_net_exit,
4681 static void __exit packet_exit(void)
4683 unregister_netdevice_notifier(&packet_netdev_notifier);
4684 unregister_pernet_subsys(&packet_net_ops);
4685 sock_unregister(PF_PACKET);
4686 proto_unregister(&packet_proto);
4689 static int __init packet_init(void)
4693 rc = proto_register(&packet_proto, 0);
4696 rc = sock_register(&packet_family_ops);
4699 rc = register_pernet_subsys(&packet_net_ops);
4702 rc = register_netdevice_notifier(&packet_netdev_notifier);
4709 unregister_pernet_subsys(&packet_net_ops);
4711 sock_unregister(PF_PACKET);
4713 proto_unregister(&packet_proto);
4718 module_init(packet_init);
4719 module_exit(packet_exit);
4720 MODULE_LICENSE("GPL");
4721 MODULE_ALIAS_NETPROTO(PF_PACKET);