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>
100 - if device has no dev->hard_header routine, it adds and removes ll header
101 inside itself. In this case ll header is invisible outside of device,
102 but higher levels still should reserve dev->hard_header_len.
103 Some devices are enough clever to reallocate skb, when header
104 will not fit to reserved space (tunnel), another ones are silly
106 - packet socket receives packets with pulled ll header,
107 so that SOCK_RAW should push it back.
112 Incoming, dev->hard_header!=NULL
113 mac_header -> ll header
116 Outgoing, dev->hard_header!=NULL
117 mac_header -> ll header
120 Incoming, dev->hard_header==NULL
121 mac_header -> UNKNOWN position. It is very likely, that it points to ll
122 header. PPP makes it, that is wrong, because introduce
123 assymetry between rx and tx paths.
126 Outgoing, dev->hard_header==NULL
127 mac_header -> data. ll header is still not built!
131 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
137 dev->hard_header != NULL
138 mac_header -> ll header
141 dev->hard_header == NULL (ll header is added by device, we cannot control it)
145 We should set nh.raw on output to correct posistion,
146 packet classifier depends on it.
149 /* Private packet socket structures. */
151 /* identical to struct packet_mreq except it has
152 * a longer address field.
154 struct packet_mreq_max
{
156 unsigned short mr_type
;
157 unsigned short mr_alen
;
158 unsigned char mr_address
[MAX_ADDR_LEN
];
162 struct tpacket_hdr
*h1
;
163 struct tpacket2_hdr
*h2
;
164 struct tpacket3_hdr
*h3
;
168 static int packet_set_ring(struct sock
*sk
, union tpacket_req_u
*req_u
,
169 int closing
, int tx_ring
);
171 #define V3_ALIGNMENT (8)
173 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
175 #define BLK_PLUS_PRIV(sz_of_priv) \
176 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
178 #define PGV_FROM_VMALLOC 1
180 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
181 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
182 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
183 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
184 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
185 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
186 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
189 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
);
190 static int tpacket_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
191 struct packet_type
*pt
, struct net_device
*orig_dev
);
193 static void *packet_previous_frame(struct packet_sock
*po
,
194 struct packet_ring_buffer
*rb
,
196 static void packet_increment_head(struct packet_ring_buffer
*buff
);
197 static int prb_curr_blk_in_use(struct tpacket_kbdq_core
*,
198 struct tpacket_block_desc
*);
199 static void *prb_dispatch_next_block(struct tpacket_kbdq_core
*,
200 struct packet_sock
*);
201 static void prb_retire_current_block(struct tpacket_kbdq_core
*,
202 struct packet_sock
*, unsigned int status
);
203 static int prb_queue_frozen(struct tpacket_kbdq_core
*);
204 static void prb_open_block(struct tpacket_kbdq_core
*,
205 struct tpacket_block_desc
*);
206 static void prb_retire_rx_blk_timer_expired(unsigned long);
207 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core
*);
208 static void prb_init_blk_timer(struct packet_sock
*,
209 struct tpacket_kbdq_core
*,
210 void (*func
) (unsigned long));
211 static void prb_fill_rxhash(struct tpacket_kbdq_core
*, struct tpacket3_hdr
*);
212 static void prb_clear_rxhash(struct tpacket_kbdq_core
*,
213 struct tpacket3_hdr
*);
214 static void prb_fill_vlan_info(struct tpacket_kbdq_core
*,
215 struct tpacket3_hdr
*);
216 static void packet_flush_mclist(struct sock
*sk
);
218 struct packet_skb_cb
{
220 struct sockaddr_pkt pkt
;
222 /* Trick: alias skb original length with
223 * ll.sll_family and ll.protocol in order
226 unsigned int origlen
;
227 struct sockaddr_ll ll
;
232 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
234 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
235 #define GET_PBLOCK_DESC(x, bid) \
236 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
237 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
238 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
239 #define GET_NEXT_PRB_BLK_NUM(x) \
240 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
241 ((x)->kactive_blk_num+1) : 0)
243 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
);
244 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
);
246 static int packet_direct_xmit(struct sk_buff
*skb
)
248 struct net_device
*dev
= skb
->dev
;
249 netdev_features_t features
;
250 struct netdev_queue
*txq
;
251 int ret
= NETDEV_TX_BUSY
;
253 if (unlikely(!netif_running(dev
) ||
254 !netif_carrier_ok(dev
)))
257 features
= netif_skb_features(skb
);
258 if (skb_needs_linearize(skb
, features
) &&
259 __skb_linearize(skb
))
262 txq
= skb_get_tx_queue(dev
, skb
);
266 HARD_TX_LOCK(dev
, txq
, smp_processor_id());
267 if (!netif_xmit_frozen_or_drv_stopped(txq
))
268 ret
= netdev_start_xmit(skb
, dev
, txq
, false);
269 HARD_TX_UNLOCK(dev
, txq
);
273 if (!dev_xmit_complete(ret
))
278 atomic_long_inc(&dev
->tx_dropped
);
280 return NET_XMIT_DROP
;
283 static struct net_device
*packet_cached_dev_get(struct packet_sock
*po
)
285 struct net_device
*dev
;
288 dev
= rcu_dereference(po
->cached_dev
);
296 static void packet_cached_dev_assign(struct packet_sock
*po
,
297 struct net_device
*dev
)
299 rcu_assign_pointer(po
->cached_dev
, dev
);
302 static void packet_cached_dev_reset(struct packet_sock
*po
)
304 RCU_INIT_POINTER(po
->cached_dev
, NULL
);
307 static bool packet_use_direct_xmit(const struct packet_sock
*po
)
309 return po
->xmit
== packet_direct_xmit
;
312 static u16
__packet_pick_tx_queue(struct net_device
*dev
, struct sk_buff
*skb
)
314 return (u16
) raw_smp_processor_id() % dev
->real_num_tx_queues
;
317 static void packet_pick_tx_queue(struct net_device
*dev
, struct sk_buff
*skb
)
319 const struct net_device_ops
*ops
= dev
->netdev_ops
;
322 if (ops
->ndo_select_queue
) {
323 queue_index
= ops
->ndo_select_queue(dev
, skb
, NULL
,
324 __packet_pick_tx_queue
);
325 queue_index
= netdev_cap_txqueue(dev
, queue_index
);
327 queue_index
= __packet_pick_tx_queue(dev
, skb
);
330 skb_set_queue_mapping(skb
, queue_index
);
333 /* register_prot_hook must be invoked with the po->bind_lock held,
334 * or from a context in which asynchronous accesses to the packet
335 * socket is not possible (packet_create()).
337 static void register_prot_hook(struct sock
*sk
)
339 struct packet_sock
*po
= pkt_sk(sk
);
343 __fanout_link(sk
, po
);
345 dev_add_pack(&po
->prot_hook
);
352 /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
353 * held. If the sync parameter is true, we will temporarily drop
354 * the po->bind_lock and do a synchronize_net to make sure no
355 * asynchronous packet processing paths still refer to the elements
356 * of po->prot_hook. If the sync parameter is false, it is the
357 * callers responsibility to take care of this.
359 static void __unregister_prot_hook(struct sock
*sk
, bool sync
)
361 struct packet_sock
*po
= pkt_sk(sk
);
366 __fanout_unlink(sk
, po
);
368 __dev_remove_pack(&po
->prot_hook
);
373 spin_unlock(&po
->bind_lock
);
375 spin_lock(&po
->bind_lock
);
379 static void unregister_prot_hook(struct sock
*sk
, bool sync
)
381 struct packet_sock
*po
= pkt_sk(sk
);
384 __unregister_prot_hook(sk
, sync
);
387 static inline struct page
* __pure
pgv_to_page(void *addr
)
389 if (is_vmalloc_addr(addr
))
390 return vmalloc_to_page(addr
);
391 return virt_to_page(addr
);
394 static void __packet_set_status(struct packet_sock
*po
, void *frame
, int status
)
396 union tpacket_uhdr h
;
399 switch (po
->tp_version
) {
401 h
.h1
->tp_status
= status
;
402 flush_dcache_page(pgv_to_page(&h
.h1
->tp_status
));
405 h
.h2
->tp_status
= status
;
406 flush_dcache_page(pgv_to_page(&h
.h2
->tp_status
));
410 WARN(1, "TPACKET version not supported.\n");
417 static int __packet_get_status(struct packet_sock
*po
, void *frame
)
419 union tpacket_uhdr h
;
424 switch (po
->tp_version
) {
426 flush_dcache_page(pgv_to_page(&h
.h1
->tp_status
));
427 return h
.h1
->tp_status
;
429 flush_dcache_page(pgv_to_page(&h
.h2
->tp_status
));
430 return h
.h2
->tp_status
;
433 WARN(1, "TPACKET version not supported.\n");
439 static __u32
tpacket_get_timestamp(struct sk_buff
*skb
, struct timespec
*ts
,
442 struct skb_shared_hwtstamps
*shhwtstamps
= skb_hwtstamps(skb
);
445 (flags
& SOF_TIMESTAMPING_RAW_HARDWARE
) &&
446 ktime_to_timespec_cond(shhwtstamps
->hwtstamp
, ts
))
447 return TP_STATUS_TS_RAW_HARDWARE
;
449 if (ktime_to_timespec_cond(skb
->tstamp
, ts
))
450 return TP_STATUS_TS_SOFTWARE
;
455 static __u32
__packet_set_timestamp(struct packet_sock
*po
, void *frame
,
458 union tpacket_uhdr h
;
462 if (!(ts_status
= tpacket_get_timestamp(skb
, &ts
, po
->tp_tstamp
)))
466 switch (po
->tp_version
) {
468 h
.h1
->tp_sec
= ts
.tv_sec
;
469 h
.h1
->tp_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
472 h
.h2
->tp_sec
= ts
.tv_sec
;
473 h
.h2
->tp_nsec
= ts
.tv_nsec
;
477 WARN(1, "TPACKET version not supported.\n");
481 /* one flush is safe, as both fields always lie on the same cacheline */
482 flush_dcache_page(pgv_to_page(&h
.h1
->tp_sec
));
488 static void *packet_lookup_frame(struct packet_sock
*po
,
489 struct packet_ring_buffer
*rb
,
490 unsigned int position
,
493 unsigned int pg_vec_pos
, frame_offset
;
494 union tpacket_uhdr h
;
496 pg_vec_pos
= position
/ rb
->frames_per_block
;
497 frame_offset
= position
% rb
->frames_per_block
;
499 h
.raw
= rb
->pg_vec
[pg_vec_pos
].buffer
+
500 (frame_offset
* rb
->frame_size
);
502 if (status
!= __packet_get_status(po
, h
.raw
))
508 static void *packet_current_frame(struct packet_sock
*po
,
509 struct packet_ring_buffer
*rb
,
512 return packet_lookup_frame(po
, rb
, rb
->head
, status
);
515 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core
*pkc
)
517 del_timer_sync(&pkc
->retire_blk_timer
);
520 static void prb_shutdown_retire_blk_timer(struct packet_sock
*po
,
522 struct sk_buff_head
*rb_queue
)
524 struct tpacket_kbdq_core
*pkc
;
526 pkc
= tx_ring
? GET_PBDQC_FROM_RB(&po
->tx_ring
) :
527 GET_PBDQC_FROM_RB(&po
->rx_ring
);
529 spin_lock_bh(&rb_queue
->lock
);
530 pkc
->delete_blk_timer
= 1;
531 spin_unlock_bh(&rb_queue
->lock
);
533 prb_del_retire_blk_timer(pkc
);
536 static void prb_init_blk_timer(struct packet_sock
*po
,
537 struct tpacket_kbdq_core
*pkc
,
538 void (*func
) (unsigned long))
540 init_timer(&pkc
->retire_blk_timer
);
541 pkc
->retire_blk_timer
.data
= (long)po
;
542 pkc
->retire_blk_timer
.function
= func
;
543 pkc
->retire_blk_timer
.expires
= jiffies
;
546 static void prb_setup_retire_blk_timer(struct packet_sock
*po
, int tx_ring
)
548 struct tpacket_kbdq_core
*pkc
;
553 pkc
= tx_ring
? GET_PBDQC_FROM_RB(&po
->tx_ring
) :
554 GET_PBDQC_FROM_RB(&po
->rx_ring
);
555 prb_init_blk_timer(po
, pkc
, prb_retire_rx_blk_timer_expired
);
558 static int prb_calc_retire_blk_tmo(struct packet_sock
*po
,
559 int blk_size_in_bytes
)
561 struct net_device
*dev
;
562 unsigned int mbits
= 0, msec
= 0, div
= 0, tmo
= 0;
563 struct ethtool_cmd ecmd
;
568 dev
= __dev_get_by_index(sock_net(&po
->sk
), po
->ifindex
);
569 if (unlikely(!dev
)) {
571 return DEFAULT_PRB_RETIRE_TOV
;
573 err
= __ethtool_get_settings(dev
, &ecmd
);
574 speed
= ethtool_cmd_speed(&ecmd
);
578 * If the link speed is so slow you don't really
579 * need to worry about perf anyways
581 if (speed
< SPEED_1000
|| speed
== SPEED_UNKNOWN
) {
582 return DEFAULT_PRB_RETIRE_TOV
;
589 mbits
= (blk_size_in_bytes
* 8) / (1024 * 1024);
601 static void prb_init_ft_ops(struct tpacket_kbdq_core
*p1
,
602 union tpacket_req_u
*req_u
)
604 p1
->feature_req_word
= req_u
->req3
.tp_feature_req_word
;
607 static void init_prb_bdqc(struct packet_sock
*po
,
608 struct packet_ring_buffer
*rb
,
610 union tpacket_req_u
*req_u
, int tx_ring
)
612 struct tpacket_kbdq_core
*p1
= GET_PBDQC_FROM_RB(rb
);
613 struct tpacket_block_desc
*pbd
;
615 memset(p1
, 0x0, sizeof(*p1
));
617 p1
->knxt_seq_num
= 1;
619 pbd
= (struct tpacket_block_desc
*)pg_vec
[0].buffer
;
620 p1
->pkblk_start
= pg_vec
[0].buffer
;
621 p1
->kblk_size
= req_u
->req3
.tp_block_size
;
622 p1
->knum_blocks
= req_u
->req3
.tp_block_nr
;
623 p1
->hdrlen
= po
->tp_hdrlen
;
624 p1
->version
= po
->tp_version
;
625 p1
->last_kactive_blk_num
= 0;
626 po
->stats
.stats3
.tp_freeze_q_cnt
= 0;
627 if (req_u
->req3
.tp_retire_blk_tov
)
628 p1
->retire_blk_tov
= req_u
->req3
.tp_retire_blk_tov
;
630 p1
->retire_blk_tov
= prb_calc_retire_blk_tmo(po
,
631 req_u
->req3
.tp_block_size
);
632 p1
->tov_in_jiffies
= msecs_to_jiffies(p1
->retire_blk_tov
);
633 p1
->blk_sizeof_priv
= req_u
->req3
.tp_sizeof_priv
;
635 p1
->max_frame_len
= p1
->kblk_size
- BLK_PLUS_PRIV(p1
->blk_sizeof_priv
);
636 prb_init_ft_ops(p1
, req_u
);
637 prb_setup_retire_blk_timer(po
, tx_ring
);
638 prb_open_block(p1
, pbd
);
641 /* Do NOT update the last_blk_num first.
642 * Assumes sk_buff_head lock is held.
644 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core
*pkc
)
646 mod_timer(&pkc
->retire_blk_timer
,
647 jiffies
+ pkc
->tov_in_jiffies
);
648 pkc
->last_kactive_blk_num
= pkc
->kactive_blk_num
;
653 * 1) We refresh the timer only when we open a block.
654 * By doing this we don't waste cycles refreshing the timer
655 * on packet-by-packet basis.
657 * With a 1MB block-size, on a 1Gbps line, it will take
658 * i) ~8 ms to fill a block + ii) memcpy etc.
659 * In this cut we are not accounting for the memcpy time.
661 * So, if the user sets the 'tmo' to 10ms then the timer
662 * will never fire while the block is still getting filled
663 * (which is what we want). However, the user could choose
664 * to close a block early and that's fine.
666 * But when the timer does fire, we check whether or not to refresh it.
667 * Since the tmo granularity is in msecs, it is not too expensive
668 * to refresh the timer, lets say every '8' msecs.
669 * Either the user can set the 'tmo' or we can derive it based on
670 * a) line-speed and b) block-size.
671 * prb_calc_retire_blk_tmo() calculates the tmo.
674 static void prb_retire_rx_blk_timer_expired(unsigned long data
)
676 struct packet_sock
*po
= (struct packet_sock
*)data
;
677 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
679 struct tpacket_block_desc
*pbd
;
681 spin_lock(&po
->sk
.sk_receive_queue
.lock
);
683 frozen
= prb_queue_frozen(pkc
);
684 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
686 if (unlikely(pkc
->delete_blk_timer
))
689 /* We only need to plug the race when the block is partially filled.
691 * lock(); increment BLOCK_NUM_PKTS; unlock()
692 * copy_bits() is in progress ...
693 * timer fires on other cpu:
694 * we can't retire the current block because copy_bits
698 if (BLOCK_NUM_PKTS(pbd
)) {
699 while (atomic_read(&pkc
->blk_fill_in_prog
)) {
700 /* Waiting for skb_copy_bits to finish... */
705 if (pkc
->last_kactive_blk_num
== pkc
->kactive_blk_num
) {
707 prb_retire_current_block(pkc
, po
, TP_STATUS_BLK_TMO
);
708 if (!prb_dispatch_next_block(pkc
, po
))
713 /* Case 1. Queue was frozen because user-space was
716 if (prb_curr_blk_in_use(pkc
, pbd
)) {
718 * Ok, user-space is still behind.
719 * So just refresh the timer.
723 /* Case 2. queue was frozen,user-space caught up,
724 * now the link went idle && the timer fired.
725 * We don't have a block to close.So we open this
726 * block and restart the timer.
727 * opening a block thaws the queue,restarts timer
728 * Thawing/timer-refresh is a side effect.
730 prb_open_block(pkc
, pbd
);
737 _prb_refresh_rx_retire_blk_timer(pkc
);
740 spin_unlock(&po
->sk
.sk_receive_queue
.lock
);
743 static void prb_flush_block(struct tpacket_kbdq_core
*pkc1
,
744 struct tpacket_block_desc
*pbd1
, __u32 status
)
746 /* Flush everything minus the block header */
748 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
753 /* Skip the block header(we know header WILL fit in 4K) */
756 end
= (u8
*)PAGE_ALIGN((unsigned long)pkc1
->pkblk_end
);
757 for (; start
< end
; start
+= PAGE_SIZE
)
758 flush_dcache_page(pgv_to_page(start
));
763 /* Now update the block status. */
765 BLOCK_STATUS(pbd1
) = status
;
767 /* Flush the block header */
769 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
771 flush_dcache_page(pgv_to_page(start
));
781 * 2) Increment active_blk_num
783 * Note:We DONT refresh the timer on purpose.
784 * Because almost always the next block will be opened.
786 static void prb_close_block(struct tpacket_kbdq_core
*pkc1
,
787 struct tpacket_block_desc
*pbd1
,
788 struct packet_sock
*po
, unsigned int stat
)
790 __u32 status
= TP_STATUS_USER
| stat
;
792 struct tpacket3_hdr
*last_pkt
;
793 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
794 struct sock
*sk
= &po
->sk
;
796 if (po
->stats
.stats3
.tp_drops
)
797 status
|= TP_STATUS_LOSING
;
799 last_pkt
= (struct tpacket3_hdr
*)pkc1
->prev
;
800 last_pkt
->tp_next_offset
= 0;
802 /* Get the ts of the last pkt */
803 if (BLOCK_NUM_PKTS(pbd1
)) {
804 h1
->ts_last_pkt
.ts_sec
= last_pkt
->tp_sec
;
805 h1
->ts_last_pkt
.ts_nsec
= last_pkt
->tp_nsec
;
807 /* Ok, we tmo'd - so get the current time */
810 h1
->ts_last_pkt
.ts_sec
= ts
.tv_sec
;
811 h1
->ts_last_pkt
.ts_nsec
= ts
.tv_nsec
;
816 /* Flush the block */
817 prb_flush_block(pkc1
, pbd1
, status
);
819 sk
->sk_data_ready(sk
);
821 pkc1
->kactive_blk_num
= GET_NEXT_PRB_BLK_NUM(pkc1
);
824 static void prb_thaw_queue(struct tpacket_kbdq_core
*pkc
)
826 pkc
->reset_pending_on_curr_blk
= 0;
830 * Side effect of opening a block:
832 * 1) prb_queue is thawed.
833 * 2) retire_blk_timer is refreshed.
836 static void prb_open_block(struct tpacket_kbdq_core
*pkc1
,
837 struct tpacket_block_desc
*pbd1
)
840 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
844 /* We could have just memset this but we will lose the
845 * flexibility of making the priv area sticky
848 BLOCK_SNUM(pbd1
) = pkc1
->knxt_seq_num
++;
849 BLOCK_NUM_PKTS(pbd1
) = 0;
850 BLOCK_LEN(pbd1
) = BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
854 h1
->ts_first_pkt
.ts_sec
= ts
.tv_sec
;
855 h1
->ts_first_pkt
.ts_nsec
= ts
.tv_nsec
;
857 pkc1
->pkblk_start
= (char *)pbd1
;
858 pkc1
->nxt_offset
= pkc1
->pkblk_start
+ BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
860 BLOCK_O2FP(pbd1
) = (__u32
)BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
861 BLOCK_O2PRIV(pbd1
) = BLK_HDR_LEN
;
863 pbd1
->version
= pkc1
->version
;
864 pkc1
->prev
= pkc1
->nxt_offset
;
865 pkc1
->pkblk_end
= pkc1
->pkblk_start
+ pkc1
->kblk_size
;
867 prb_thaw_queue(pkc1
);
868 _prb_refresh_rx_retire_blk_timer(pkc1
);
874 * Queue freeze logic:
875 * 1) Assume tp_block_nr = 8 blocks.
876 * 2) At time 't0', user opens Rx ring.
877 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
878 * 4) user-space is either sleeping or processing block '0'.
879 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
880 * it will close block-7,loop around and try to fill block '0'.
882 * __packet_lookup_frame_in_block
883 * prb_retire_current_block()
884 * prb_dispatch_next_block()
885 * |->(BLOCK_STATUS == USER) evaluates to true
886 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
887 * 6) Now there are two cases:
888 * 6.1) Link goes idle right after the queue is frozen.
889 * But remember, the last open_block() refreshed the timer.
890 * When this timer expires,it will refresh itself so that we can
891 * re-open block-0 in near future.
892 * 6.2) Link is busy and keeps on receiving packets. This is a simple
893 * case and __packet_lookup_frame_in_block will check if block-0
894 * is free and can now be re-used.
896 static void prb_freeze_queue(struct tpacket_kbdq_core
*pkc
,
897 struct packet_sock
*po
)
899 pkc
->reset_pending_on_curr_blk
= 1;
900 po
->stats
.stats3
.tp_freeze_q_cnt
++;
903 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
906 * If the next block is free then we will dispatch it
907 * and return a good offset.
908 * Else, we will freeze the queue.
909 * So, caller must check the return value.
911 static void *prb_dispatch_next_block(struct tpacket_kbdq_core
*pkc
,
912 struct packet_sock
*po
)
914 struct tpacket_block_desc
*pbd
;
918 /* 1. Get current block num */
919 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
921 /* 2. If this block is currently in_use then freeze the queue */
922 if (TP_STATUS_USER
& BLOCK_STATUS(pbd
)) {
923 prb_freeze_queue(pkc
, po
);
929 * open this block and return the offset where the first packet
930 * needs to get stored.
932 prb_open_block(pkc
, pbd
);
933 return (void *)pkc
->nxt_offset
;
936 static void prb_retire_current_block(struct tpacket_kbdq_core
*pkc
,
937 struct packet_sock
*po
, unsigned int status
)
939 struct tpacket_block_desc
*pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
941 /* retire/close the current block */
942 if (likely(TP_STATUS_KERNEL
== BLOCK_STATUS(pbd
))) {
944 * Plug the case where copy_bits() is in progress on
945 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
946 * have space to copy the pkt in the current block and
947 * called prb_retire_current_block()
949 * We don't need to worry about the TMO case because
950 * the timer-handler already handled this case.
952 if (!(status
& TP_STATUS_BLK_TMO
)) {
953 while (atomic_read(&pkc
->blk_fill_in_prog
)) {
954 /* Waiting for skb_copy_bits to finish... */
958 prb_close_block(pkc
, pbd
, po
, status
);
963 static int prb_curr_blk_in_use(struct tpacket_kbdq_core
*pkc
,
964 struct tpacket_block_desc
*pbd
)
966 return TP_STATUS_USER
& BLOCK_STATUS(pbd
);
969 static int prb_queue_frozen(struct tpacket_kbdq_core
*pkc
)
971 return pkc
->reset_pending_on_curr_blk
;
974 static void prb_clear_blk_fill_status(struct packet_ring_buffer
*rb
)
976 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
977 atomic_dec(&pkc
->blk_fill_in_prog
);
980 static void prb_fill_rxhash(struct tpacket_kbdq_core
*pkc
,
981 struct tpacket3_hdr
*ppd
)
983 ppd
->hv1
.tp_rxhash
= skb_get_hash(pkc
->skb
);
986 static void prb_clear_rxhash(struct tpacket_kbdq_core
*pkc
,
987 struct tpacket3_hdr
*ppd
)
989 ppd
->hv1
.tp_rxhash
= 0;
992 static void prb_fill_vlan_info(struct tpacket_kbdq_core
*pkc
,
993 struct tpacket3_hdr
*ppd
)
995 if (skb_vlan_tag_present(pkc
->skb
)) {
996 ppd
->hv1
.tp_vlan_tci
= skb_vlan_tag_get(pkc
->skb
);
997 ppd
->hv1
.tp_vlan_tpid
= ntohs(pkc
->skb
->vlan_proto
);
998 ppd
->tp_status
= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
1000 ppd
->hv1
.tp_vlan_tci
= 0;
1001 ppd
->hv1
.tp_vlan_tpid
= 0;
1002 ppd
->tp_status
= TP_STATUS_AVAILABLE
;
1006 static void prb_run_all_ft_ops(struct tpacket_kbdq_core
*pkc
,
1007 struct tpacket3_hdr
*ppd
)
1009 ppd
->hv1
.tp_padding
= 0;
1010 prb_fill_vlan_info(pkc
, ppd
);
1012 if (pkc
->feature_req_word
& TP_FT_REQ_FILL_RXHASH
)
1013 prb_fill_rxhash(pkc
, ppd
);
1015 prb_clear_rxhash(pkc
, ppd
);
1018 static void prb_fill_curr_block(char *curr
,
1019 struct tpacket_kbdq_core
*pkc
,
1020 struct tpacket_block_desc
*pbd
,
1023 struct tpacket3_hdr
*ppd
;
1025 ppd
= (struct tpacket3_hdr
*)curr
;
1026 ppd
->tp_next_offset
= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1028 pkc
->nxt_offset
+= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1029 BLOCK_LEN(pbd
) += TOTAL_PKT_LEN_INCL_ALIGN(len
);
1030 BLOCK_NUM_PKTS(pbd
) += 1;
1031 atomic_inc(&pkc
->blk_fill_in_prog
);
1032 prb_run_all_ft_ops(pkc
, ppd
);
1035 /* Assumes caller has the sk->rx_queue.lock */
1036 static void *__packet_lookup_frame_in_block(struct packet_sock
*po
,
1037 struct sk_buff
*skb
,
1042 struct tpacket_kbdq_core
*pkc
;
1043 struct tpacket_block_desc
*pbd
;
1046 pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
1047 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1049 /* Queue is frozen when user space is lagging behind */
1050 if (prb_queue_frozen(pkc
)) {
1052 * Check if that last block which caused the queue to freeze,
1053 * is still in_use by user-space.
1055 if (prb_curr_blk_in_use(pkc
, pbd
)) {
1056 /* Can't record this packet */
1060 * Ok, the block was released by user-space.
1061 * Now let's open that block.
1062 * opening a block also thaws the queue.
1063 * Thawing is a side effect.
1065 prb_open_block(pkc
, pbd
);
1070 curr
= pkc
->nxt_offset
;
1072 end
= (char *)pbd
+ pkc
->kblk_size
;
1074 /* first try the current block */
1075 if (curr
+TOTAL_PKT_LEN_INCL_ALIGN(len
) < end
) {
1076 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1077 return (void *)curr
;
1080 /* Ok, close the current block */
1081 prb_retire_current_block(pkc
, po
, 0);
1083 /* Now, try to dispatch the next block */
1084 curr
= (char *)prb_dispatch_next_block(pkc
, po
);
1086 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1087 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1088 return (void *)curr
;
1092 * No free blocks are available.user_space hasn't caught up yet.
1093 * Queue was just frozen and now this packet will get dropped.
1098 static void *packet_current_rx_frame(struct packet_sock
*po
,
1099 struct sk_buff
*skb
,
1100 int status
, unsigned int len
)
1103 switch (po
->tp_version
) {
1106 curr
= packet_lookup_frame(po
, &po
->rx_ring
,
1107 po
->rx_ring
.head
, status
);
1110 return __packet_lookup_frame_in_block(po
, skb
, status
, len
);
1112 WARN(1, "TPACKET version not supported\n");
1118 static void *prb_lookup_block(struct packet_sock
*po
,
1119 struct packet_ring_buffer
*rb
,
1123 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
1124 struct tpacket_block_desc
*pbd
= GET_PBLOCK_DESC(pkc
, idx
);
1126 if (status
!= BLOCK_STATUS(pbd
))
1131 static int prb_previous_blk_num(struct packet_ring_buffer
*rb
)
1134 if (rb
->prb_bdqc
.kactive_blk_num
)
1135 prev
= rb
->prb_bdqc
.kactive_blk_num
-1;
1137 prev
= rb
->prb_bdqc
.knum_blocks
-1;
1141 /* Assumes caller has held the rx_queue.lock */
1142 static void *__prb_previous_block(struct packet_sock
*po
,
1143 struct packet_ring_buffer
*rb
,
1146 unsigned int previous
= prb_previous_blk_num(rb
);
1147 return prb_lookup_block(po
, rb
, previous
, status
);
1150 static void *packet_previous_rx_frame(struct packet_sock
*po
,
1151 struct packet_ring_buffer
*rb
,
1154 if (po
->tp_version
<= TPACKET_V2
)
1155 return packet_previous_frame(po
, rb
, status
);
1157 return __prb_previous_block(po
, rb
, status
);
1160 static void packet_increment_rx_head(struct packet_sock
*po
,
1161 struct packet_ring_buffer
*rb
)
1163 switch (po
->tp_version
) {
1166 return packet_increment_head(rb
);
1169 WARN(1, "TPACKET version not supported.\n");
1175 static void *packet_previous_frame(struct packet_sock
*po
,
1176 struct packet_ring_buffer
*rb
,
1179 unsigned int previous
= rb
->head
? rb
->head
- 1 : rb
->frame_max
;
1180 return packet_lookup_frame(po
, rb
, previous
, status
);
1183 static void packet_increment_head(struct packet_ring_buffer
*buff
)
1185 buff
->head
= buff
->head
!= buff
->frame_max
? buff
->head
+1 : 0;
1188 static void packet_inc_pending(struct packet_ring_buffer
*rb
)
1190 this_cpu_inc(*rb
->pending_refcnt
);
1193 static void packet_dec_pending(struct packet_ring_buffer
*rb
)
1195 this_cpu_dec(*rb
->pending_refcnt
);
1198 static unsigned int packet_read_pending(const struct packet_ring_buffer
*rb
)
1200 unsigned int refcnt
= 0;
1203 /* We don't use pending refcount in rx_ring. */
1204 if (rb
->pending_refcnt
== NULL
)
1207 for_each_possible_cpu(cpu
)
1208 refcnt
+= *per_cpu_ptr(rb
->pending_refcnt
, cpu
);
1213 static int packet_alloc_pending(struct packet_sock
*po
)
1215 po
->rx_ring
.pending_refcnt
= NULL
;
1217 po
->tx_ring
.pending_refcnt
= alloc_percpu(unsigned int);
1218 if (unlikely(po
->tx_ring
.pending_refcnt
== NULL
))
1224 static void packet_free_pending(struct packet_sock
*po
)
1226 free_percpu(po
->tx_ring
.pending_refcnt
);
1229 static bool packet_rcv_has_room(struct packet_sock
*po
, struct sk_buff
*skb
)
1231 struct sock
*sk
= &po
->sk
;
1234 if (po
->prot_hook
.func
!= tpacket_rcv
)
1235 return (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
)
1238 spin_lock(&sk
->sk_receive_queue
.lock
);
1239 if (po
->tp_version
== TPACKET_V3
)
1240 has_room
= prb_lookup_block(po
, &po
->rx_ring
,
1241 po
->rx_ring
.prb_bdqc
.kactive_blk_num
,
1244 has_room
= packet_lookup_frame(po
, &po
->rx_ring
,
1247 spin_unlock(&sk
->sk_receive_queue
.lock
);
1252 static void packet_sock_destruct(struct sock
*sk
)
1254 skb_queue_purge(&sk
->sk_error_queue
);
1256 WARN_ON(atomic_read(&sk
->sk_rmem_alloc
));
1257 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
1259 if (!sock_flag(sk
, SOCK_DEAD
)) {
1260 pr_err("Attempt to release alive packet socket: %p\n", sk
);
1264 sk_refcnt_debug_dec(sk
);
1267 static int fanout_rr_next(struct packet_fanout
*f
, unsigned int num
)
1269 int x
= atomic_read(&f
->rr_cur
) + 1;
1277 static unsigned int fanout_demux_hash(struct packet_fanout
*f
,
1278 struct sk_buff
*skb
,
1281 return reciprocal_scale(skb_get_hash(skb
), num
);
1284 static unsigned int fanout_demux_lb(struct packet_fanout
*f
,
1285 struct sk_buff
*skb
,
1290 cur
= atomic_read(&f
->rr_cur
);
1291 while ((old
= atomic_cmpxchg(&f
->rr_cur
, cur
,
1292 fanout_rr_next(f
, num
))) != cur
)
1297 static unsigned int fanout_demux_cpu(struct packet_fanout
*f
,
1298 struct sk_buff
*skb
,
1301 return smp_processor_id() % num
;
1304 static unsigned int fanout_demux_rnd(struct packet_fanout
*f
,
1305 struct sk_buff
*skb
,
1308 return prandom_u32_max(num
);
1311 static unsigned int fanout_demux_rollover(struct packet_fanout
*f
,
1312 struct sk_buff
*skb
,
1313 unsigned int idx
, unsigned int skip
,
1318 i
= j
= min_t(int, f
->next
[idx
], num
- 1);
1320 if (i
!= skip
&& packet_rcv_has_room(pkt_sk(f
->arr
[i
]), skb
)) {
1332 static unsigned int fanout_demux_qm(struct packet_fanout
*f
,
1333 struct sk_buff
*skb
,
1336 return skb_get_queue_mapping(skb
) % num
;
1339 static bool fanout_has_flag(struct packet_fanout
*f
, u16 flag
)
1341 return f
->flags
& (flag
>> 8);
1344 static int packet_rcv_fanout(struct sk_buff
*skb
, struct net_device
*dev
,
1345 struct packet_type
*pt
, struct net_device
*orig_dev
)
1347 struct packet_fanout
*f
= pt
->af_packet_priv
;
1348 unsigned int num
= f
->num_members
;
1349 struct packet_sock
*po
;
1352 if (!net_eq(dev_net(dev
), read_pnet(&f
->net
)) ||
1359 case PACKET_FANOUT_HASH
:
1361 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_DEFRAG
)) {
1362 skb
= ip_check_defrag(skb
, IP_DEFRAG_AF_PACKET
);
1366 idx
= fanout_demux_hash(f
, skb
, num
);
1368 case PACKET_FANOUT_LB
:
1369 idx
= fanout_demux_lb(f
, skb
, num
);
1371 case PACKET_FANOUT_CPU
:
1372 idx
= fanout_demux_cpu(f
, skb
, num
);
1374 case PACKET_FANOUT_RND
:
1375 idx
= fanout_demux_rnd(f
, skb
, num
);
1377 case PACKET_FANOUT_QM
:
1378 idx
= fanout_demux_qm(f
, skb
, num
);
1380 case PACKET_FANOUT_ROLLOVER
:
1381 idx
= fanout_demux_rollover(f
, skb
, 0, (unsigned int) -1, num
);
1385 po
= pkt_sk(f
->arr
[idx
]);
1386 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_ROLLOVER
) &&
1387 unlikely(!packet_rcv_has_room(po
, skb
))) {
1388 idx
= fanout_demux_rollover(f
, skb
, idx
, idx
, num
);
1389 po
= pkt_sk(f
->arr
[idx
]);
1392 return po
->prot_hook
.func(skb
, dev
, &po
->prot_hook
, orig_dev
);
1395 DEFINE_MUTEX(fanout_mutex
);
1396 EXPORT_SYMBOL_GPL(fanout_mutex
);
1397 static LIST_HEAD(fanout_list
);
1399 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
)
1401 struct packet_fanout
*f
= po
->fanout
;
1403 spin_lock(&f
->lock
);
1404 f
->arr
[f
->num_members
] = sk
;
1407 spin_unlock(&f
->lock
);
1410 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
)
1412 struct packet_fanout
*f
= po
->fanout
;
1415 spin_lock(&f
->lock
);
1416 for (i
= 0; i
< f
->num_members
; i
++) {
1417 if (f
->arr
[i
] == sk
)
1420 BUG_ON(i
>= f
->num_members
);
1421 f
->arr
[i
] = f
->arr
[f
->num_members
- 1];
1423 spin_unlock(&f
->lock
);
1426 static bool match_fanout_group(struct packet_type
*ptype
, struct sock
*sk
)
1428 if (ptype
->af_packet_priv
== (void *)((struct packet_sock
*)sk
)->fanout
)
1434 static int fanout_add(struct sock
*sk
, u16 id
, u16 type_flags
)
1436 struct packet_sock
*po
= pkt_sk(sk
);
1437 struct packet_fanout
*f
, *match
;
1438 u8 type
= type_flags
& 0xff;
1439 u8 flags
= type_flags
>> 8;
1443 case PACKET_FANOUT_ROLLOVER
:
1444 if (type_flags
& PACKET_FANOUT_FLAG_ROLLOVER
)
1446 case PACKET_FANOUT_HASH
:
1447 case PACKET_FANOUT_LB
:
1448 case PACKET_FANOUT_CPU
:
1449 case PACKET_FANOUT_RND
:
1450 case PACKET_FANOUT_QM
:
1462 mutex_lock(&fanout_mutex
);
1464 list_for_each_entry(f
, &fanout_list
, list
) {
1466 read_pnet(&f
->net
) == sock_net(sk
)) {
1472 if (match
&& match
->flags
!= flags
)
1476 match
= kzalloc(sizeof(*match
), GFP_KERNEL
);
1479 write_pnet(&match
->net
, sock_net(sk
));
1482 match
->flags
= flags
;
1483 atomic_set(&match
->rr_cur
, 0);
1484 INIT_LIST_HEAD(&match
->list
);
1485 spin_lock_init(&match
->lock
);
1486 atomic_set(&match
->sk_ref
, 0);
1487 match
->prot_hook
.type
= po
->prot_hook
.type
;
1488 match
->prot_hook
.dev
= po
->prot_hook
.dev
;
1489 match
->prot_hook
.func
= packet_rcv_fanout
;
1490 match
->prot_hook
.af_packet_priv
= match
;
1491 match
->prot_hook
.id_match
= match_fanout_group
;
1492 dev_add_pack(&match
->prot_hook
);
1493 list_add(&match
->list
, &fanout_list
);
1496 if (match
->type
== type
&&
1497 match
->prot_hook
.type
== po
->prot_hook
.type
&&
1498 match
->prot_hook
.dev
== po
->prot_hook
.dev
) {
1500 if (atomic_read(&match
->sk_ref
) < PACKET_FANOUT_MAX
) {
1501 __dev_remove_pack(&po
->prot_hook
);
1503 atomic_inc(&match
->sk_ref
);
1504 __fanout_link(sk
, po
);
1509 mutex_unlock(&fanout_mutex
);
1513 static void fanout_release(struct sock
*sk
)
1515 struct packet_sock
*po
= pkt_sk(sk
);
1516 struct packet_fanout
*f
;
1522 mutex_lock(&fanout_mutex
);
1525 if (atomic_dec_and_test(&f
->sk_ref
)) {
1527 dev_remove_pack(&f
->prot_hook
);
1530 mutex_unlock(&fanout_mutex
);
1533 static const struct proto_ops packet_ops
;
1535 static const struct proto_ops packet_ops_spkt
;
1537 static int packet_rcv_spkt(struct sk_buff
*skb
, struct net_device
*dev
,
1538 struct packet_type
*pt
, struct net_device
*orig_dev
)
1541 struct sockaddr_pkt
*spkt
;
1544 * When we registered the protocol we saved the socket in the data
1545 * field for just this event.
1548 sk
= pt
->af_packet_priv
;
1551 * Yank back the headers [hope the device set this
1552 * right or kerboom...]
1554 * Incoming packets have ll header pulled,
1557 * For outgoing ones skb->data == skb_mac_header(skb)
1558 * so that this procedure is noop.
1561 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1564 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1567 skb
= skb_share_check(skb
, GFP_ATOMIC
);
1571 /* drop any routing info */
1574 /* drop conntrack reference */
1577 spkt
= &PACKET_SKB_CB(skb
)->sa
.pkt
;
1579 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1582 * The SOCK_PACKET socket receives _all_ frames.
1585 spkt
->spkt_family
= dev
->type
;
1586 strlcpy(spkt
->spkt_device
, dev
->name
, sizeof(spkt
->spkt_device
));
1587 spkt
->spkt_protocol
= skb
->protocol
;
1590 * Charge the memory to the socket. This is done specifically
1591 * to prevent sockets using all the memory up.
1594 if (sock_queue_rcv_skb(sk
, skb
) == 0)
1605 * Output a raw packet to a device layer. This bypasses all the other
1606 * protocol layers and you must therefore supply it with a complete frame
1609 static int packet_sendmsg_spkt(struct kiocb
*iocb
, struct socket
*sock
,
1610 struct msghdr
*msg
, size_t len
)
1612 struct sock
*sk
= sock
->sk
;
1613 DECLARE_SOCKADDR(struct sockaddr_pkt
*, saddr
, msg
->msg_name
);
1614 struct sk_buff
*skb
= NULL
;
1615 struct net_device
*dev
;
1621 * Get and verify the address.
1625 if (msg
->msg_namelen
< sizeof(struct sockaddr
))
1627 if (msg
->msg_namelen
== sizeof(struct sockaddr_pkt
))
1628 proto
= saddr
->spkt_protocol
;
1630 return -ENOTCONN
; /* SOCK_PACKET must be sent giving an address */
1633 * Find the device first to size check it
1636 saddr
->spkt_device
[sizeof(saddr
->spkt_device
) - 1] = 0;
1639 dev
= dev_get_by_name_rcu(sock_net(sk
), saddr
->spkt_device
);
1645 if (!(dev
->flags
& IFF_UP
))
1649 * You may not queue a frame bigger than the mtu. This is the lowest level
1650 * raw protocol and you must do your own fragmentation at this level.
1653 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
1654 if (!netif_supports_nofcs(dev
)) {
1655 err
= -EPROTONOSUPPORT
;
1658 extra_len
= 4; /* We're doing our own CRC */
1662 if (len
> dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
+ extra_len
)
1666 size_t reserved
= LL_RESERVED_SPACE(dev
);
1667 int tlen
= dev
->needed_tailroom
;
1668 unsigned int hhlen
= dev
->header_ops
? dev
->hard_header_len
: 0;
1671 skb
= sock_wmalloc(sk
, len
+ reserved
+ tlen
, 0, GFP_KERNEL
);
1674 /* FIXME: Save some space for broken drivers that write a hard
1675 * header at transmission time by themselves. PPP is the notable
1676 * one here. This should really be fixed at the driver level.
1678 skb_reserve(skb
, reserved
);
1679 skb_reset_network_header(skb
);
1681 /* Try to align data part correctly */
1686 skb_reset_network_header(skb
);
1688 err
= memcpy_from_msg(skb_put(skb
, len
), msg
, len
);
1694 if (len
> (dev
->mtu
+ dev
->hard_header_len
+ extra_len
)) {
1695 /* Earlier code assumed this would be a VLAN pkt,
1696 * double-check this now that we have the actual
1699 struct ethhdr
*ehdr
;
1700 skb_reset_mac_header(skb
);
1701 ehdr
= eth_hdr(skb
);
1702 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
1708 skb
->protocol
= proto
;
1710 skb
->priority
= sk
->sk_priority
;
1711 skb
->mark
= sk
->sk_mark
;
1713 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
1715 if (unlikely(extra_len
== 4))
1718 skb_probe_transport_header(skb
, 0);
1720 dev_queue_xmit(skb
);
1731 static unsigned int run_filter(const struct sk_buff
*skb
,
1732 const struct sock
*sk
,
1735 struct sk_filter
*filter
;
1738 filter
= rcu_dereference(sk
->sk_filter
);
1740 res
= SK_RUN_FILTER(filter
, skb
);
1747 * This function makes lazy skb cloning in hope that most of packets
1748 * are discarded by BPF.
1750 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1751 * and skb->cb are mangled. It works because (and until) packets
1752 * falling here are owned by current CPU. Output packets are cloned
1753 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1754 * sequencially, so that if we return skb to original state on exit,
1755 * we will not harm anyone.
1758 static int packet_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1759 struct packet_type
*pt
, struct net_device
*orig_dev
)
1762 struct sockaddr_ll
*sll
;
1763 struct packet_sock
*po
;
1764 u8
*skb_head
= skb
->data
;
1765 int skb_len
= skb
->len
;
1766 unsigned int snaplen
, res
;
1768 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1771 sk
= pt
->af_packet_priv
;
1774 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1779 if (dev
->header_ops
) {
1780 /* The device has an explicit notion of ll header,
1781 * exported to higher levels.
1783 * Otherwise, the device hides details of its frame
1784 * structure, so that corresponding packet head is
1785 * never delivered to user.
1787 if (sk
->sk_type
!= SOCK_DGRAM
)
1788 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1789 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
1790 /* Special case: outgoing packets have ll header at head */
1791 skb_pull(skb
, skb_network_offset(skb
));
1797 res
= run_filter(skb
, sk
, snaplen
);
1799 goto drop_n_restore
;
1803 if (atomic_read(&sk
->sk_rmem_alloc
) >= sk
->sk_rcvbuf
)
1806 if (skb_shared(skb
)) {
1807 struct sk_buff
*nskb
= skb_clone(skb
, GFP_ATOMIC
);
1811 if (skb_head
!= skb
->data
) {
1812 skb
->data
= skb_head
;
1819 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb
)) + MAX_ADDR_LEN
- 8 >
1822 sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
1823 sll
->sll_hatype
= dev
->type
;
1824 sll
->sll_pkttype
= skb
->pkt_type
;
1825 if (unlikely(po
->origdev
))
1826 sll
->sll_ifindex
= orig_dev
->ifindex
;
1828 sll
->sll_ifindex
= dev
->ifindex
;
1830 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
1832 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
1833 * Use their space for storing the original skb length.
1835 PACKET_SKB_CB(skb
)->sa
.origlen
= skb
->len
;
1837 if (pskb_trim(skb
, snaplen
))
1840 skb_set_owner_r(skb
, sk
);
1844 /* drop conntrack reference */
1847 spin_lock(&sk
->sk_receive_queue
.lock
);
1848 po
->stats
.stats1
.tp_packets
++;
1849 skb
->dropcount
= atomic_read(&sk
->sk_drops
);
1850 __skb_queue_tail(&sk
->sk_receive_queue
, skb
);
1851 spin_unlock(&sk
->sk_receive_queue
.lock
);
1852 sk
->sk_data_ready(sk
);
1856 spin_lock(&sk
->sk_receive_queue
.lock
);
1857 po
->stats
.stats1
.tp_drops
++;
1858 atomic_inc(&sk
->sk_drops
);
1859 spin_unlock(&sk
->sk_receive_queue
.lock
);
1862 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
1863 skb
->data
= skb_head
;
1871 static int tpacket_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1872 struct packet_type
*pt
, struct net_device
*orig_dev
)
1875 struct packet_sock
*po
;
1876 struct sockaddr_ll
*sll
;
1877 union tpacket_uhdr h
;
1878 u8
*skb_head
= skb
->data
;
1879 int skb_len
= skb
->len
;
1880 unsigned int snaplen
, res
;
1881 unsigned long status
= TP_STATUS_USER
;
1882 unsigned short macoff
, netoff
, hdrlen
;
1883 struct sk_buff
*copy_skb
= NULL
;
1887 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
1888 * We may add members to them until current aligned size without forcing
1889 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
1891 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h2
)) != 32);
1892 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h3
)) != 48);
1894 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1897 sk
= pt
->af_packet_priv
;
1900 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1903 if (dev
->header_ops
) {
1904 if (sk
->sk_type
!= SOCK_DGRAM
)
1905 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1906 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
1907 /* Special case: outgoing packets have ll header at head */
1908 skb_pull(skb
, skb_network_offset(skb
));
1912 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
1913 status
|= TP_STATUS_CSUMNOTREADY
;
1917 res
= run_filter(skb
, sk
, snaplen
);
1919 goto drop_n_restore
;
1923 if (sk
->sk_type
== SOCK_DGRAM
) {
1924 macoff
= netoff
= TPACKET_ALIGN(po
->tp_hdrlen
) + 16 +
1927 unsigned int maclen
= skb_network_offset(skb
);
1928 netoff
= TPACKET_ALIGN(po
->tp_hdrlen
+
1929 (maclen
< 16 ? 16 : maclen
)) +
1931 macoff
= netoff
- maclen
;
1933 if (po
->tp_version
<= TPACKET_V2
) {
1934 if (macoff
+ snaplen
> po
->rx_ring
.frame_size
) {
1935 if (po
->copy_thresh
&&
1936 atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
1937 if (skb_shared(skb
)) {
1938 copy_skb
= skb_clone(skb
, GFP_ATOMIC
);
1940 copy_skb
= skb_get(skb
);
1941 skb_head
= skb
->data
;
1944 skb_set_owner_r(copy_skb
, sk
);
1946 snaplen
= po
->rx_ring
.frame_size
- macoff
;
1947 if ((int)snaplen
< 0)
1950 } else if (unlikely(macoff
+ snaplen
>
1951 GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
)) {
1954 nval
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
- macoff
;
1955 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
1956 snaplen
, nval
, macoff
);
1958 if (unlikely((int)snaplen
< 0)) {
1960 macoff
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
;
1963 spin_lock(&sk
->sk_receive_queue
.lock
);
1964 h
.raw
= packet_current_rx_frame(po
, skb
,
1965 TP_STATUS_KERNEL
, (macoff
+snaplen
));
1968 if (po
->tp_version
<= TPACKET_V2
) {
1969 packet_increment_rx_head(po
, &po
->rx_ring
);
1971 * LOSING will be reported till you read the stats,
1972 * because it's COR - Clear On Read.
1973 * Anyways, moving it for V1/V2 only as V3 doesn't need this
1976 if (po
->stats
.stats1
.tp_drops
)
1977 status
|= TP_STATUS_LOSING
;
1979 po
->stats
.stats1
.tp_packets
++;
1981 status
|= TP_STATUS_COPY
;
1982 __skb_queue_tail(&sk
->sk_receive_queue
, copy_skb
);
1984 spin_unlock(&sk
->sk_receive_queue
.lock
);
1986 skb_copy_bits(skb
, 0, h
.raw
+ macoff
, snaplen
);
1988 if (!(ts_status
= tpacket_get_timestamp(skb
, &ts
, po
->tp_tstamp
)))
1989 getnstimeofday(&ts
);
1991 status
|= ts_status
;
1993 switch (po
->tp_version
) {
1995 h
.h1
->tp_len
= skb
->len
;
1996 h
.h1
->tp_snaplen
= snaplen
;
1997 h
.h1
->tp_mac
= macoff
;
1998 h
.h1
->tp_net
= netoff
;
1999 h
.h1
->tp_sec
= ts
.tv_sec
;
2000 h
.h1
->tp_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
2001 hdrlen
= sizeof(*h
.h1
);
2004 h
.h2
->tp_len
= skb
->len
;
2005 h
.h2
->tp_snaplen
= snaplen
;
2006 h
.h2
->tp_mac
= macoff
;
2007 h
.h2
->tp_net
= netoff
;
2008 h
.h2
->tp_sec
= ts
.tv_sec
;
2009 h
.h2
->tp_nsec
= ts
.tv_nsec
;
2010 if (skb_vlan_tag_present(skb
)) {
2011 h
.h2
->tp_vlan_tci
= skb_vlan_tag_get(skb
);
2012 h
.h2
->tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
2013 status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
2015 h
.h2
->tp_vlan_tci
= 0;
2016 h
.h2
->tp_vlan_tpid
= 0;
2018 memset(h
.h2
->tp_padding
, 0, sizeof(h
.h2
->tp_padding
));
2019 hdrlen
= sizeof(*h
.h2
);
2022 /* tp_nxt_offset,vlan are already populated above.
2023 * So DONT clear those fields here
2025 h
.h3
->tp_status
|= status
;
2026 h
.h3
->tp_len
= skb
->len
;
2027 h
.h3
->tp_snaplen
= snaplen
;
2028 h
.h3
->tp_mac
= macoff
;
2029 h
.h3
->tp_net
= netoff
;
2030 h
.h3
->tp_sec
= ts
.tv_sec
;
2031 h
.h3
->tp_nsec
= ts
.tv_nsec
;
2032 memset(h
.h3
->tp_padding
, 0, sizeof(h
.h3
->tp_padding
));
2033 hdrlen
= sizeof(*h
.h3
);
2039 sll
= h
.raw
+ TPACKET_ALIGN(hdrlen
);
2040 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
2041 sll
->sll_family
= AF_PACKET
;
2042 sll
->sll_hatype
= dev
->type
;
2043 sll
->sll_protocol
= skb
->protocol
;
2044 sll
->sll_pkttype
= skb
->pkt_type
;
2045 if (unlikely(po
->origdev
))
2046 sll
->sll_ifindex
= orig_dev
->ifindex
;
2048 sll
->sll_ifindex
= dev
->ifindex
;
2052 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2053 if (po
->tp_version
<= TPACKET_V2
) {
2056 end
= (u8
*) PAGE_ALIGN((unsigned long) h
.raw
+
2059 for (start
= h
.raw
; start
< end
; start
+= PAGE_SIZE
)
2060 flush_dcache_page(pgv_to_page(start
));
2065 if (po
->tp_version
<= TPACKET_V2
) {
2066 __packet_set_status(po
, h
.raw
, status
);
2067 sk
->sk_data_ready(sk
);
2069 prb_clear_blk_fill_status(&po
->rx_ring
);
2073 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
2074 skb
->data
= skb_head
;
2082 po
->stats
.stats1
.tp_drops
++;
2083 spin_unlock(&sk
->sk_receive_queue
.lock
);
2085 sk
->sk_data_ready(sk
);
2086 kfree_skb(copy_skb
);
2087 goto drop_n_restore
;
2090 static void tpacket_destruct_skb(struct sk_buff
*skb
)
2092 struct packet_sock
*po
= pkt_sk(skb
->sk
);
2094 if (likely(po
->tx_ring
.pg_vec
)) {
2098 ph
= skb_shinfo(skb
)->destructor_arg
;
2099 packet_dec_pending(&po
->tx_ring
);
2101 ts
= __packet_set_timestamp(po
, ph
, skb
);
2102 __packet_set_status(po
, ph
, TP_STATUS_AVAILABLE
| ts
);
2108 static bool ll_header_truncated(const struct net_device
*dev
, int len
)
2110 /* net device doesn't like empty head */
2111 if (unlikely(len
<= dev
->hard_header_len
)) {
2112 net_warn_ratelimited("%s: packet size is too short (%d <= %d)\n",
2113 current
->comm
, len
, dev
->hard_header_len
);
2120 static int tpacket_fill_skb(struct packet_sock
*po
, struct sk_buff
*skb
,
2121 void *frame
, struct net_device
*dev
, int size_max
,
2122 __be16 proto
, unsigned char *addr
, int hlen
)
2124 union tpacket_uhdr ph
;
2125 int to_write
, offset
, len
, tp_len
, nr_frags
, len_max
;
2126 struct socket
*sock
= po
->sk
.sk_socket
;
2133 skb
->protocol
= proto
;
2135 skb
->priority
= po
->sk
.sk_priority
;
2136 skb
->mark
= po
->sk
.sk_mark
;
2137 sock_tx_timestamp(&po
->sk
, &skb_shinfo(skb
)->tx_flags
);
2138 skb_shinfo(skb
)->destructor_arg
= ph
.raw
;
2140 switch (po
->tp_version
) {
2142 tp_len
= ph
.h2
->tp_len
;
2145 tp_len
= ph
.h1
->tp_len
;
2148 if (unlikely(tp_len
> size_max
)) {
2149 pr_err("packet size is too long (%d > %d)\n", tp_len
, size_max
);
2153 skb_reserve(skb
, hlen
);
2154 skb_reset_network_header(skb
);
2156 if (!packet_use_direct_xmit(po
))
2157 skb_probe_transport_header(skb
, 0);
2158 if (unlikely(po
->tp_tx_has_off
)) {
2159 int off_min
, off_max
, off
;
2160 off_min
= po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2161 off_max
= po
->tx_ring
.frame_size
- tp_len
;
2162 if (sock
->type
== SOCK_DGRAM
) {
2163 switch (po
->tp_version
) {
2165 off
= ph
.h2
->tp_net
;
2168 off
= ph
.h1
->tp_net
;
2172 switch (po
->tp_version
) {
2174 off
= ph
.h2
->tp_mac
;
2177 off
= ph
.h1
->tp_mac
;
2181 if (unlikely((off
< off_min
) || (off_max
< off
)))
2183 data
= ph
.raw
+ off
;
2185 data
= ph
.raw
+ po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2189 if (sock
->type
== SOCK_DGRAM
) {
2190 err
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
,
2192 if (unlikely(err
< 0))
2194 } else if (dev
->hard_header_len
) {
2195 if (ll_header_truncated(dev
, tp_len
))
2198 skb_push(skb
, dev
->hard_header_len
);
2199 err
= skb_store_bits(skb
, 0, data
,
2200 dev
->hard_header_len
);
2204 data
+= dev
->hard_header_len
;
2205 to_write
-= dev
->hard_header_len
;
2208 offset
= offset_in_page(data
);
2209 len_max
= PAGE_SIZE
- offset
;
2210 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2212 skb
->data_len
= to_write
;
2213 skb
->len
+= to_write
;
2214 skb
->truesize
+= to_write
;
2215 atomic_add(to_write
, &po
->sk
.sk_wmem_alloc
);
2217 while (likely(to_write
)) {
2218 nr_frags
= skb_shinfo(skb
)->nr_frags
;
2220 if (unlikely(nr_frags
>= MAX_SKB_FRAGS
)) {
2221 pr_err("Packet exceed the number of skb frags(%lu)\n",
2226 page
= pgv_to_page(data
);
2228 flush_dcache_page(page
);
2230 skb_fill_page_desc(skb
, nr_frags
, page
, offset
, len
);
2233 len_max
= PAGE_SIZE
;
2234 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2240 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
)
2242 struct sk_buff
*skb
;
2243 struct net_device
*dev
;
2245 int err
, reserve
= 0;
2247 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2248 bool need_wait
= !(msg
->msg_flags
& MSG_DONTWAIT
);
2249 int tp_len
, size_max
;
2250 unsigned char *addr
;
2252 int status
= TP_STATUS_AVAILABLE
;
2255 mutex_lock(&po
->pg_vec_lock
);
2257 if (likely(saddr
== NULL
)) {
2258 dev
= packet_cached_dev_get(po
);
2263 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2265 if (msg
->msg_namelen
< (saddr
->sll_halen
2266 + offsetof(struct sockaddr_ll
,
2269 proto
= saddr
->sll_protocol
;
2270 addr
= saddr
->sll_addr
;
2271 dev
= dev_get_by_index(sock_net(&po
->sk
), saddr
->sll_ifindex
);
2275 if (unlikely(dev
== NULL
))
2278 if (unlikely(!(dev
->flags
& IFF_UP
)))
2281 reserve
= dev
->hard_header_len
+ VLAN_HLEN
;
2282 size_max
= po
->tx_ring
.frame_size
2283 - (po
->tp_hdrlen
- sizeof(struct sockaddr_ll
));
2285 if (size_max
> dev
->mtu
+ reserve
)
2286 size_max
= dev
->mtu
+ reserve
;
2289 ph
= packet_current_frame(po
, &po
->tx_ring
,
2290 TP_STATUS_SEND_REQUEST
);
2291 if (unlikely(ph
== NULL
)) {
2292 if (need_wait
&& need_resched())
2297 status
= TP_STATUS_SEND_REQUEST
;
2298 hlen
= LL_RESERVED_SPACE(dev
);
2299 tlen
= dev
->needed_tailroom
;
2300 skb
= sock_alloc_send_skb(&po
->sk
,
2301 hlen
+ tlen
+ sizeof(struct sockaddr_ll
),
2304 if (unlikely(skb
== NULL
))
2307 tp_len
= tpacket_fill_skb(po
, skb
, ph
, dev
, size_max
, proto
,
2309 if (tp_len
> dev
->mtu
+ dev
->hard_header_len
) {
2310 struct ethhdr
*ehdr
;
2311 /* Earlier code assumed this would be a VLAN pkt,
2312 * double-check this now that we have the actual
2316 skb_reset_mac_header(skb
);
2317 ehdr
= eth_hdr(skb
);
2318 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
))
2321 if (unlikely(tp_len
< 0)) {
2323 __packet_set_status(po
, ph
,
2324 TP_STATUS_AVAILABLE
);
2325 packet_increment_head(&po
->tx_ring
);
2329 status
= TP_STATUS_WRONG_FORMAT
;
2335 packet_pick_tx_queue(dev
, skb
);
2337 skb
->destructor
= tpacket_destruct_skb
;
2338 __packet_set_status(po
, ph
, TP_STATUS_SENDING
);
2339 packet_inc_pending(&po
->tx_ring
);
2341 status
= TP_STATUS_SEND_REQUEST
;
2342 err
= po
->xmit(skb
);
2343 if (unlikely(err
> 0)) {
2344 err
= net_xmit_errno(err
);
2345 if (err
&& __packet_get_status(po
, ph
) ==
2346 TP_STATUS_AVAILABLE
) {
2347 /* skb was destructed already */
2352 * skb was dropped but not destructed yet;
2353 * let's treat it like congestion or err < 0
2357 packet_increment_head(&po
->tx_ring
);
2359 } while (likely((ph
!= NULL
) ||
2360 /* Note: packet_read_pending() might be slow if we have
2361 * to call it as it's per_cpu variable, but in fast-path
2362 * we already short-circuit the loop with the first
2363 * condition, and luckily don't have to go that path
2366 (need_wait
&& packet_read_pending(&po
->tx_ring
))));
2372 __packet_set_status(po
, ph
, status
);
2377 mutex_unlock(&po
->pg_vec_lock
);
2381 static struct sk_buff
*packet_alloc_skb(struct sock
*sk
, size_t prepad
,
2382 size_t reserve
, size_t len
,
2383 size_t linear
, int noblock
,
2386 struct sk_buff
*skb
;
2388 /* Under a page? Don't bother with paged skb. */
2389 if (prepad
+ len
< PAGE_SIZE
|| !linear
)
2392 skb
= sock_alloc_send_pskb(sk
, prepad
+ linear
, len
- linear
, noblock
,
2397 skb_reserve(skb
, reserve
);
2398 skb_put(skb
, linear
);
2399 skb
->data_len
= len
- linear
;
2400 skb
->len
+= len
- linear
;
2405 static int packet_snd(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
2407 struct sock
*sk
= sock
->sk
;
2408 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2409 struct sk_buff
*skb
;
2410 struct net_device
*dev
;
2412 unsigned char *addr
;
2413 int err
, reserve
= 0;
2414 struct virtio_net_hdr vnet_hdr
= { 0 };
2417 struct packet_sock
*po
= pkt_sk(sk
);
2418 unsigned short gso_type
= 0;
2424 * Get and verify the address.
2427 if (likely(saddr
== NULL
)) {
2428 dev
= packet_cached_dev_get(po
);
2433 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2435 if (msg
->msg_namelen
< (saddr
->sll_halen
+ offsetof(struct sockaddr_ll
, sll_addr
)))
2437 proto
= saddr
->sll_protocol
;
2438 addr
= saddr
->sll_addr
;
2439 dev
= dev_get_by_index(sock_net(sk
), saddr
->sll_ifindex
);
2443 if (unlikely(dev
== NULL
))
2446 if (unlikely(!(dev
->flags
& IFF_UP
)))
2449 if (sock
->type
== SOCK_RAW
)
2450 reserve
= dev
->hard_header_len
;
2451 if (po
->has_vnet_hdr
) {
2452 vnet_hdr_len
= sizeof(vnet_hdr
);
2455 if (len
< vnet_hdr_len
)
2458 len
-= vnet_hdr_len
;
2461 n
= copy_from_iter(&vnet_hdr
, vnet_hdr_len
, &msg
->msg_iter
);
2462 if (n
!= vnet_hdr_len
)
2465 if ((vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) &&
2466 (__virtio16_to_cpu(false, vnet_hdr
.csum_start
) +
2467 __virtio16_to_cpu(false, vnet_hdr
.csum_offset
) + 2 >
2468 __virtio16_to_cpu(false, vnet_hdr
.hdr_len
)))
2469 vnet_hdr
.hdr_len
= __cpu_to_virtio16(false,
2470 __virtio16_to_cpu(false, vnet_hdr
.csum_start
) +
2471 __virtio16_to_cpu(false, vnet_hdr
.csum_offset
) + 2);
2474 if (__virtio16_to_cpu(false, vnet_hdr
.hdr_len
) > len
)
2477 if (vnet_hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
2478 switch (vnet_hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
2479 case VIRTIO_NET_HDR_GSO_TCPV4
:
2480 gso_type
= SKB_GSO_TCPV4
;
2482 case VIRTIO_NET_HDR_GSO_TCPV6
:
2483 gso_type
= SKB_GSO_TCPV6
;
2485 case VIRTIO_NET_HDR_GSO_UDP
:
2486 gso_type
= SKB_GSO_UDP
;
2492 if (vnet_hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
2493 gso_type
|= SKB_GSO_TCP_ECN
;
2495 if (vnet_hdr
.gso_size
== 0)
2501 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
2502 if (!netif_supports_nofcs(dev
)) {
2503 err
= -EPROTONOSUPPORT
;
2506 extra_len
= 4; /* We're doing our own CRC */
2510 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ VLAN_HLEN
+ extra_len
))
2514 hlen
= LL_RESERVED_SPACE(dev
);
2515 tlen
= dev
->needed_tailroom
;
2516 skb
= packet_alloc_skb(sk
, hlen
+ tlen
, hlen
, len
,
2517 __virtio16_to_cpu(false, vnet_hdr
.hdr_len
),
2518 msg
->msg_flags
& MSG_DONTWAIT
, &err
);
2522 skb_set_network_header(skb
, reserve
);
2525 if (sock
->type
== SOCK_DGRAM
) {
2526 offset
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
, NULL
, len
);
2527 if (unlikely(offset
< 0))
2530 if (ll_header_truncated(dev
, len
))
2534 /* Returns -EFAULT on error */
2535 err
= skb_copy_datagram_from_iter(skb
, offset
, &msg
->msg_iter
, len
);
2539 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
2541 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ extra_len
)) {
2542 /* Earlier code assumed this would be a VLAN pkt,
2543 * double-check this now that we have the actual
2546 struct ethhdr
*ehdr
;
2547 skb_reset_mac_header(skb
);
2548 ehdr
= eth_hdr(skb
);
2549 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
2555 skb
->protocol
= proto
;
2557 skb
->priority
= sk
->sk_priority
;
2558 skb
->mark
= sk
->sk_mark
;
2560 packet_pick_tx_queue(dev
, skb
);
2562 if (po
->has_vnet_hdr
) {
2563 if (vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
2564 u16 s
= __virtio16_to_cpu(false, vnet_hdr
.csum_start
);
2565 u16 o
= __virtio16_to_cpu(false, vnet_hdr
.csum_offset
);
2566 if (!skb_partial_csum_set(skb
, s
, o
)) {
2572 skb_shinfo(skb
)->gso_size
=
2573 __virtio16_to_cpu(false, vnet_hdr
.gso_size
);
2574 skb_shinfo(skb
)->gso_type
= gso_type
;
2576 /* Header must be checked, and gso_segs computed. */
2577 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
2578 skb_shinfo(skb
)->gso_segs
= 0;
2580 len
+= vnet_hdr_len
;
2583 if (!packet_use_direct_xmit(po
))
2584 skb_probe_transport_header(skb
, reserve
);
2585 if (unlikely(extra_len
== 4))
2588 err
= po
->xmit(skb
);
2589 if (err
> 0 && (err
= net_xmit_errno(err
)) != 0)
2605 static int packet_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
2606 struct msghdr
*msg
, size_t len
)
2608 struct sock
*sk
= sock
->sk
;
2609 struct packet_sock
*po
= pkt_sk(sk
);
2611 if (po
->tx_ring
.pg_vec
)
2612 return tpacket_snd(po
, msg
);
2614 return packet_snd(sock
, msg
, len
);
2618 * Close a PACKET socket. This is fairly simple. We immediately go
2619 * to 'closed' state and remove our protocol entry in the device list.
2622 static int packet_release(struct socket
*sock
)
2624 struct sock
*sk
= sock
->sk
;
2625 struct packet_sock
*po
;
2627 union tpacket_req_u req_u
;
2635 mutex_lock(&net
->packet
.sklist_lock
);
2636 sk_del_node_init_rcu(sk
);
2637 mutex_unlock(&net
->packet
.sklist_lock
);
2640 sock_prot_inuse_add(net
, sk
->sk_prot
, -1);
2643 spin_lock(&po
->bind_lock
);
2644 unregister_prot_hook(sk
, false);
2645 packet_cached_dev_reset(po
);
2647 if (po
->prot_hook
.dev
) {
2648 dev_put(po
->prot_hook
.dev
);
2649 po
->prot_hook
.dev
= NULL
;
2651 spin_unlock(&po
->bind_lock
);
2653 packet_flush_mclist(sk
);
2655 if (po
->rx_ring
.pg_vec
) {
2656 memset(&req_u
, 0, sizeof(req_u
));
2657 packet_set_ring(sk
, &req_u
, 1, 0);
2660 if (po
->tx_ring
.pg_vec
) {
2661 memset(&req_u
, 0, sizeof(req_u
));
2662 packet_set_ring(sk
, &req_u
, 1, 1);
2669 * Now the socket is dead. No more input will appear.
2676 skb_queue_purge(&sk
->sk_receive_queue
);
2677 packet_free_pending(po
);
2678 sk_refcnt_debug_release(sk
);
2685 * Attach a packet hook.
2688 static int packet_do_bind(struct sock
*sk
, struct net_device
*dev
, __be16 proto
)
2690 struct packet_sock
*po
= pkt_sk(sk
);
2691 const struct net_device
*dev_curr
;
2703 spin_lock(&po
->bind_lock
);
2705 proto_curr
= po
->prot_hook
.type
;
2706 dev_curr
= po
->prot_hook
.dev
;
2708 need_rehook
= proto_curr
!= proto
|| dev_curr
!= dev
;
2711 unregister_prot_hook(sk
, true);
2714 po
->prot_hook
.type
= proto
;
2716 if (po
->prot_hook
.dev
)
2717 dev_put(po
->prot_hook
.dev
);
2719 po
->prot_hook
.dev
= dev
;
2721 po
->ifindex
= dev
? dev
->ifindex
: 0;
2722 packet_cached_dev_assign(po
, dev
);
2725 if (proto
== 0 || !need_rehook
)
2728 if (!dev
|| (dev
->flags
& IFF_UP
)) {
2729 register_prot_hook(sk
);
2731 sk
->sk_err
= ENETDOWN
;
2732 if (!sock_flag(sk
, SOCK_DEAD
))
2733 sk
->sk_error_report(sk
);
2737 spin_unlock(&po
->bind_lock
);
2743 * Bind a packet socket to a device
2746 static int packet_bind_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
2749 struct sock
*sk
= sock
->sk
;
2751 struct net_device
*dev
;
2758 if (addr_len
!= sizeof(struct sockaddr
))
2760 strlcpy(name
, uaddr
->sa_data
, sizeof(name
));
2762 dev
= dev_get_by_name(sock_net(sk
), name
);
2764 err
= packet_do_bind(sk
, dev
, pkt_sk(sk
)->num
);
2768 static int packet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
2770 struct sockaddr_ll
*sll
= (struct sockaddr_ll
*)uaddr
;
2771 struct sock
*sk
= sock
->sk
;
2772 struct net_device
*dev
= NULL
;
2780 if (addr_len
< sizeof(struct sockaddr_ll
))
2782 if (sll
->sll_family
!= AF_PACKET
)
2785 if (sll
->sll_ifindex
) {
2787 dev
= dev_get_by_index(sock_net(sk
), sll
->sll_ifindex
);
2791 err
= packet_do_bind(sk
, dev
, sll
->sll_protocol
? : pkt_sk(sk
)->num
);
2797 static struct proto packet_proto
= {
2799 .owner
= THIS_MODULE
,
2800 .obj_size
= sizeof(struct packet_sock
),
2804 * Create a packet of type SOCK_PACKET.
2807 static int packet_create(struct net
*net
, struct socket
*sock
, int protocol
,
2811 struct packet_sock
*po
;
2812 __be16 proto
= (__force __be16
)protocol
; /* weird, but documented */
2815 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
))
2817 if (sock
->type
!= SOCK_DGRAM
&& sock
->type
!= SOCK_RAW
&&
2818 sock
->type
!= SOCK_PACKET
)
2819 return -ESOCKTNOSUPPORT
;
2821 sock
->state
= SS_UNCONNECTED
;
2824 sk
= sk_alloc(net
, PF_PACKET
, GFP_KERNEL
, &packet_proto
);
2828 sock
->ops
= &packet_ops
;
2829 if (sock
->type
== SOCK_PACKET
)
2830 sock
->ops
= &packet_ops_spkt
;
2832 sock_init_data(sock
, sk
);
2835 sk
->sk_family
= PF_PACKET
;
2837 po
->xmit
= dev_queue_xmit
;
2839 err
= packet_alloc_pending(po
);
2843 packet_cached_dev_reset(po
);
2845 sk
->sk_destruct
= packet_sock_destruct
;
2846 sk_refcnt_debug_inc(sk
);
2849 * Attach a protocol block
2852 spin_lock_init(&po
->bind_lock
);
2853 mutex_init(&po
->pg_vec_lock
);
2854 po
->prot_hook
.func
= packet_rcv
;
2856 if (sock
->type
== SOCK_PACKET
)
2857 po
->prot_hook
.func
= packet_rcv_spkt
;
2859 po
->prot_hook
.af_packet_priv
= sk
;
2862 po
->prot_hook
.type
= proto
;
2863 register_prot_hook(sk
);
2866 mutex_lock(&net
->packet
.sklist_lock
);
2867 sk_add_node_rcu(sk
, &net
->packet
.sklist
);
2868 mutex_unlock(&net
->packet
.sklist_lock
);
2871 sock_prot_inuse_add(net
, &packet_proto
, 1);
2882 * Pull a packet from our receive queue and hand it to the user.
2883 * If necessary we block.
2886 static int packet_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
2887 struct msghdr
*msg
, size_t len
, int flags
)
2889 struct sock
*sk
= sock
->sk
;
2890 struct sk_buff
*skb
;
2892 int vnet_hdr_len
= 0;
2893 unsigned int origlen
= 0;
2896 if (flags
& ~(MSG_PEEK
|MSG_DONTWAIT
|MSG_TRUNC
|MSG_CMSG_COMPAT
|MSG_ERRQUEUE
))
2900 /* What error should we return now? EUNATTACH? */
2901 if (pkt_sk(sk
)->ifindex
< 0)
2905 if (flags
& MSG_ERRQUEUE
) {
2906 err
= sock_recv_errqueue(sk
, msg
, len
,
2907 SOL_PACKET
, PACKET_TX_TIMESTAMP
);
2912 * Call the generic datagram receiver. This handles all sorts
2913 * of horrible races and re-entrancy so we can forget about it
2914 * in the protocol layers.
2916 * Now it will return ENETDOWN, if device have just gone down,
2917 * but then it will block.
2920 skb
= skb_recv_datagram(sk
, flags
, flags
& MSG_DONTWAIT
, &err
);
2923 * An error occurred so return it. Because skb_recv_datagram()
2924 * handles the blocking we don't see and worry about blocking
2931 if (pkt_sk(sk
)->has_vnet_hdr
) {
2932 struct virtio_net_hdr vnet_hdr
= { 0 };
2935 vnet_hdr_len
= sizeof(vnet_hdr
);
2936 if (len
< vnet_hdr_len
)
2939 len
-= vnet_hdr_len
;
2941 if (skb_is_gso(skb
)) {
2942 struct skb_shared_info
*sinfo
= skb_shinfo(skb
);
2944 /* This is a hint as to how much should be linear. */
2946 __cpu_to_virtio16(false, skb_headlen(skb
));
2948 __cpu_to_virtio16(false, sinfo
->gso_size
);
2949 if (sinfo
->gso_type
& SKB_GSO_TCPV4
)
2950 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
2951 else if (sinfo
->gso_type
& SKB_GSO_TCPV6
)
2952 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
2953 else if (sinfo
->gso_type
& SKB_GSO_UDP
)
2954 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
2955 else if (sinfo
->gso_type
& SKB_GSO_FCOE
)
2959 if (sinfo
->gso_type
& SKB_GSO_TCP_ECN
)
2960 vnet_hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
2962 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
2964 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2965 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
2966 vnet_hdr
.csum_start
= __cpu_to_virtio16(false,
2967 skb_checksum_start_offset(skb
));
2968 vnet_hdr
.csum_offset
= __cpu_to_virtio16(false,
2970 } else if (skb
->ip_summed
== CHECKSUM_UNNECESSARY
) {
2971 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_DATA_VALID
;
2972 } /* else everything is zero */
2974 err
= memcpy_to_msg(msg
, (void *)&vnet_hdr
, vnet_hdr_len
);
2979 /* You lose any data beyond the buffer you gave. If it worries
2980 * a user program they can ask the device for its MTU
2986 msg
->msg_flags
|= MSG_TRUNC
;
2989 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
2993 if (sock
->type
!= SOCK_PACKET
) {
2994 struct sockaddr_ll
*sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
2996 /* Original length was stored in sockaddr_ll fields */
2997 origlen
= PACKET_SKB_CB(skb
)->sa
.origlen
;
2998 sll
->sll_family
= AF_PACKET
;
2999 sll
->sll_protocol
= skb
->protocol
;
3002 sock_recv_ts_and_drops(msg
, sk
, skb
);
3004 if (msg
->msg_name
) {
3005 /* If the address length field is there to be filled
3006 * in, we fill it in now.
3008 if (sock
->type
== SOCK_PACKET
) {
3009 __sockaddr_check_size(sizeof(struct sockaddr_pkt
));
3010 msg
->msg_namelen
= sizeof(struct sockaddr_pkt
);
3012 struct sockaddr_ll
*sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
3014 msg
->msg_namelen
= sll
->sll_halen
+
3015 offsetof(struct sockaddr_ll
, sll_addr
);
3017 memcpy(msg
->msg_name
, &PACKET_SKB_CB(skb
)->sa
,
3021 if (pkt_sk(sk
)->auxdata
) {
3022 struct tpacket_auxdata aux
;
3024 aux
.tp_status
= TP_STATUS_USER
;
3025 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
3026 aux
.tp_status
|= TP_STATUS_CSUMNOTREADY
;
3027 aux
.tp_len
= origlen
;
3028 aux
.tp_snaplen
= skb
->len
;
3030 aux
.tp_net
= skb_network_offset(skb
);
3031 if (skb_vlan_tag_present(skb
)) {
3032 aux
.tp_vlan_tci
= skb_vlan_tag_get(skb
);
3033 aux
.tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
3034 aux
.tp_status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
3036 aux
.tp_vlan_tci
= 0;
3037 aux
.tp_vlan_tpid
= 0;
3039 put_cmsg(msg
, SOL_PACKET
, PACKET_AUXDATA
, sizeof(aux
), &aux
);
3043 * Free or return the buffer as appropriate. Again this
3044 * hides all the races and re-entrancy issues from us.
3046 err
= vnet_hdr_len
+ ((flags
&MSG_TRUNC
) ? skb
->len
: copied
);
3049 skb_free_datagram(sk
, skb
);
3054 static int packet_getname_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
3055 int *uaddr_len
, int peer
)
3057 struct net_device
*dev
;
3058 struct sock
*sk
= sock
->sk
;
3063 uaddr
->sa_family
= AF_PACKET
;
3064 memset(uaddr
->sa_data
, 0, sizeof(uaddr
->sa_data
));
3066 dev
= dev_get_by_index_rcu(sock_net(sk
), pkt_sk(sk
)->ifindex
);
3068 strlcpy(uaddr
->sa_data
, dev
->name
, sizeof(uaddr
->sa_data
));
3070 *uaddr_len
= sizeof(*uaddr
);
3075 static int packet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
3076 int *uaddr_len
, int peer
)
3078 struct net_device
*dev
;
3079 struct sock
*sk
= sock
->sk
;
3080 struct packet_sock
*po
= pkt_sk(sk
);
3081 DECLARE_SOCKADDR(struct sockaddr_ll
*, sll
, uaddr
);
3086 sll
->sll_family
= AF_PACKET
;
3087 sll
->sll_ifindex
= po
->ifindex
;
3088 sll
->sll_protocol
= po
->num
;
3089 sll
->sll_pkttype
= 0;
3091 dev
= dev_get_by_index_rcu(sock_net(sk
), po
->ifindex
);
3093 sll
->sll_hatype
= dev
->type
;
3094 sll
->sll_halen
= dev
->addr_len
;
3095 memcpy(sll
->sll_addr
, dev
->dev_addr
, dev
->addr_len
);
3097 sll
->sll_hatype
= 0; /* Bad: we have no ARPHRD_UNSPEC */
3101 *uaddr_len
= offsetof(struct sockaddr_ll
, sll_addr
) + sll
->sll_halen
;
3106 static int packet_dev_mc(struct net_device
*dev
, struct packet_mclist
*i
,
3110 case PACKET_MR_MULTICAST
:
3111 if (i
->alen
!= dev
->addr_len
)
3114 return dev_mc_add(dev
, i
->addr
);
3116 return dev_mc_del(dev
, i
->addr
);
3118 case PACKET_MR_PROMISC
:
3119 return dev_set_promiscuity(dev
, what
);
3120 case PACKET_MR_ALLMULTI
:
3121 return dev_set_allmulti(dev
, what
);
3122 case PACKET_MR_UNICAST
:
3123 if (i
->alen
!= dev
->addr_len
)
3126 return dev_uc_add(dev
, i
->addr
);
3128 return dev_uc_del(dev
, i
->addr
);
3136 static void packet_dev_mclist(struct net_device
*dev
, struct packet_mclist
*i
, int what
)
3138 for ( ; i
; i
= i
->next
) {
3139 if (i
->ifindex
== dev
->ifindex
)
3140 packet_dev_mc(dev
, i
, what
);
3144 static int packet_mc_add(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3146 struct packet_sock
*po
= pkt_sk(sk
);
3147 struct packet_mclist
*ml
, *i
;
3148 struct net_device
*dev
;
3154 dev
= __dev_get_by_index(sock_net(sk
), mreq
->mr_ifindex
);
3159 if (mreq
->mr_alen
> dev
->addr_len
)
3163 i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
3168 for (ml
= po
->mclist
; ml
; ml
= ml
->next
) {
3169 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3170 ml
->type
== mreq
->mr_type
&&
3171 ml
->alen
== mreq
->mr_alen
&&
3172 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3174 /* Free the new element ... */
3180 i
->type
= mreq
->mr_type
;
3181 i
->ifindex
= mreq
->mr_ifindex
;
3182 i
->alen
= mreq
->mr_alen
;
3183 memcpy(i
->addr
, mreq
->mr_address
, i
->alen
);
3185 i
->next
= po
->mclist
;
3187 err
= packet_dev_mc(dev
, i
, 1);
3189 po
->mclist
= i
->next
;
3198 static int packet_mc_drop(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3200 struct packet_mclist
*ml
, **mlp
;
3204 for (mlp
= &pkt_sk(sk
)->mclist
; (ml
= *mlp
) != NULL
; mlp
= &ml
->next
) {
3205 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3206 ml
->type
== mreq
->mr_type
&&
3207 ml
->alen
== mreq
->mr_alen
&&
3208 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3209 if (--ml
->count
== 0) {
3210 struct net_device
*dev
;
3212 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3214 packet_dev_mc(dev
, ml
, -1);
3222 return -EADDRNOTAVAIL
;
3225 static void packet_flush_mclist(struct sock
*sk
)
3227 struct packet_sock
*po
= pkt_sk(sk
);
3228 struct packet_mclist
*ml
;
3234 while ((ml
= po
->mclist
) != NULL
) {
3235 struct net_device
*dev
;
3237 po
->mclist
= ml
->next
;
3238 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3240 packet_dev_mc(dev
, ml
, -1);
3247 packet_setsockopt(struct socket
*sock
, int level
, int optname
, char __user
*optval
, unsigned int optlen
)
3249 struct sock
*sk
= sock
->sk
;
3250 struct packet_sock
*po
= pkt_sk(sk
);
3253 if (level
!= SOL_PACKET
)
3254 return -ENOPROTOOPT
;
3257 case PACKET_ADD_MEMBERSHIP
:
3258 case PACKET_DROP_MEMBERSHIP
:
3260 struct packet_mreq_max mreq
;
3262 memset(&mreq
, 0, sizeof(mreq
));
3263 if (len
< sizeof(struct packet_mreq
))
3265 if (len
> sizeof(mreq
))
3267 if (copy_from_user(&mreq
, optval
, len
))
3269 if (len
< (mreq
.mr_alen
+ offsetof(struct packet_mreq
, mr_address
)))
3271 if (optname
== PACKET_ADD_MEMBERSHIP
)
3272 ret
= packet_mc_add(sk
, &mreq
);
3274 ret
= packet_mc_drop(sk
, &mreq
);
3278 case PACKET_RX_RING
:
3279 case PACKET_TX_RING
:
3281 union tpacket_req_u req_u
;
3284 switch (po
->tp_version
) {
3287 len
= sizeof(req_u
.req
);
3291 len
= sizeof(req_u
.req3
);
3296 if (pkt_sk(sk
)->has_vnet_hdr
)
3298 if (copy_from_user(&req_u
.req
, optval
, len
))
3300 return packet_set_ring(sk
, &req_u
, 0,
3301 optname
== PACKET_TX_RING
);
3303 case PACKET_COPY_THRESH
:
3307 if (optlen
!= sizeof(val
))
3309 if (copy_from_user(&val
, optval
, sizeof(val
)))
3312 pkt_sk(sk
)->copy_thresh
= val
;
3315 case PACKET_VERSION
:
3319 if (optlen
!= sizeof(val
))
3321 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3323 if (copy_from_user(&val
, optval
, sizeof(val
)))
3329 po
->tp_version
= val
;
3335 case PACKET_RESERVE
:
3339 if (optlen
!= sizeof(val
))
3341 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3343 if (copy_from_user(&val
, optval
, sizeof(val
)))
3345 po
->tp_reserve
= val
;
3352 if (optlen
!= sizeof(val
))
3354 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3356 if (copy_from_user(&val
, optval
, sizeof(val
)))
3358 po
->tp_loss
= !!val
;
3361 case PACKET_AUXDATA
:
3365 if (optlen
< sizeof(val
))
3367 if (copy_from_user(&val
, optval
, sizeof(val
)))
3370 po
->auxdata
= !!val
;
3373 case PACKET_ORIGDEV
:
3377 if (optlen
< sizeof(val
))
3379 if (copy_from_user(&val
, optval
, sizeof(val
)))
3382 po
->origdev
= !!val
;
3385 case PACKET_VNET_HDR
:
3389 if (sock
->type
!= SOCK_RAW
)
3391 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3393 if (optlen
< sizeof(val
))
3395 if (copy_from_user(&val
, optval
, sizeof(val
)))
3398 po
->has_vnet_hdr
= !!val
;
3401 case PACKET_TIMESTAMP
:
3405 if (optlen
!= sizeof(val
))
3407 if (copy_from_user(&val
, optval
, sizeof(val
)))
3410 po
->tp_tstamp
= val
;
3417 if (optlen
!= sizeof(val
))
3419 if (copy_from_user(&val
, optval
, sizeof(val
)))
3422 return fanout_add(sk
, val
& 0xffff, val
>> 16);
3424 case PACKET_TX_HAS_OFF
:
3428 if (optlen
!= sizeof(val
))
3430 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3432 if (copy_from_user(&val
, optval
, sizeof(val
)))
3434 po
->tp_tx_has_off
= !!val
;
3437 case PACKET_QDISC_BYPASS
:
3441 if (optlen
!= sizeof(val
))
3443 if (copy_from_user(&val
, optval
, sizeof(val
)))
3446 po
->xmit
= val
? packet_direct_xmit
: dev_queue_xmit
;
3450 return -ENOPROTOOPT
;
3454 static int packet_getsockopt(struct socket
*sock
, int level
, int optname
,
3455 char __user
*optval
, int __user
*optlen
)
3458 int val
, lv
= sizeof(val
);
3459 struct sock
*sk
= sock
->sk
;
3460 struct packet_sock
*po
= pkt_sk(sk
);
3462 union tpacket_stats_u st
;
3464 if (level
!= SOL_PACKET
)
3465 return -ENOPROTOOPT
;
3467 if (get_user(len
, optlen
))
3474 case PACKET_STATISTICS
:
3475 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3476 memcpy(&st
, &po
->stats
, sizeof(st
));
3477 memset(&po
->stats
, 0, sizeof(po
->stats
));
3478 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3480 if (po
->tp_version
== TPACKET_V3
) {
3481 lv
= sizeof(struct tpacket_stats_v3
);
3482 st
.stats3
.tp_packets
+= st
.stats3
.tp_drops
;
3485 lv
= sizeof(struct tpacket_stats
);
3486 st
.stats1
.tp_packets
+= st
.stats1
.tp_drops
;
3491 case PACKET_AUXDATA
:
3494 case PACKET_ORIGDEV
:
3497 case PACKET_VNET_HDR
:
3498 val
= po
->has_vnet_hdr
;
3500 case PACKET_VERSION
:
3501 val
= po
->tp_version
;
3504 if (len
> sizeof(int))
3506 if (copy_from_user(&val
, optval
, len
))
3510 val
= sizeof(struct tpacket_hdr
);
3513 val
= sizeof(struct tpacket2_hdr
);
3516 val
= sizeof(struct tpacket3_hdr
);
3522 case PACKET_RESERVE
:
3523 val
= po
->tp_reserve
;
3528 case PACKET_TIMESTAMP
:
3529 val
= po
->tp_tstamp
;
3533 ((u32
)po
->fanout
->id
|
3534 ((u32
)po
->fanout
->type
<< 16) |
3535 ((u32
)po
->fanout
->flags
<< 24)) :
3538 case PACKET_TX_HAS_OFF
:
3539 val
= po
->tp_tx_has_off
;
3541 case PACKET_QDISC_BYPASS
:
3542 val
= packet_use_direct_xmit(po
);
3545 return -ENOPROTOOPT
;
3550 if (put_user(len
, optlen
))
3552 if (copy_to_user(optval
, data
, len
))
3558 static int packet_notifier(struct notifier_block
*this,
3559 unsigned long msg
, void *ptr
)
3562 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
3563 struct net
*net
= dev_net(dev
);
3566 sk_for_each_rcu(sk
, &net
->packet
.sklist
) {
3567 struct packet_sock
*po
= pkt_sk(sk
);
3570 case NETDEV_UNREGISTER
:
3572 packet_dev_mclist(dev
, po
->mclist
, -1);
3576 if (dev
->ifindex
== po
->ifindex
) {
3577 spin_lock(&po
->bind_lock
);
3579 __unregister_prot_hook(sk
, false);
3580 sk
->sk_err
= ENETDOWN
;
3581 if (!sock_flag(sk
, SOCK_DEAD
))
3582 sk
->sk_error_report(sk
);
3584 if (msg
== NETDEV_UNREGISTER
) {
3585 packet_cached_dev_reset(po
);
3587 if (po
->prot_hook
.dev
)
3588 dev_put(po
->prot_hook
.dev
);
3589 po
->prot_hook
.dev
= NULL
;
3591 spin_unlock(&po
->bind_lock
);
3595 if (dev
->ifindex
== po
->ifindex
) {
3596 spin_lock(&po
->bind_lock
);
3598 register_prot_hook(sk
);
3599 spin_unlock(&po
->bind_lock
);
3609 static int packet_ioctl(struct socket
*sock
, unsigned int cmd
,
3612 struct sock
*sk
= sock
->sk
;
3617 int amount
= sk_wmem_alloc_get(sk
);
3619 return put_user(amount
, (int __user
*)arg
);
3623 struct sk_buff
*skb
;
3626 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3627 skb
= skb_peek(&sk
->sk_receive_queue
);
3630 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3631 return put_user(amount
, (int __user
*)arg
);
3634 return sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
3636 return sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
3646 case SIOCGIFBRDADDR
:
3647 case SIOCSIFBRDADDR
:
3648 case SIOCGIFNETMASK
:
3649 case SIOCSIFNETMASK
:
3650 case SIOCGIFDSTADDR
:
3651 case SIOCSIFDSTADDR
:
3653 return inet_dgram_ops
.ioctl(sock
, cmd
, arg
);
3657 return -ENOIOCTLCMD
;
3662 static unsigned int packet_poll(struct file
*file
, struct socket
*sock
,
3665 struct sock
*sk
= sock
->sk
;
3666 struct packet_sock
*po
= pkt_sk(sk
);
3667 unsigned int mask
= datagram_poll(file
, sock
, wait
);
3669 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3670 if (po
->rx_ring
.pg_vec
) {
3671 if (!packet_previous_rx_frame(po
, &po
->rx_ring
,
3673 mask
|= POLLIN
| POLLRDNORM
;
3675 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3676 spin_lock_bh(&sk
->sk_write_queue
.lock
);
3677 if (po
->tx_ring
.pg_vec
) {
3678 if (packet_current_frame(po
, &po
->tx_ring
, TP_STATUS_AVAILABLE
))
3679 mask
|= POLLOUT
| POLLWRNORM
;
3681 spin_unlock_bh(&sk
->sk_write_queue
.lock
);
3686 /* Dirty? Well, I still did not learn better way to account
3690 static void packet_mm_open(struct vm_area_struct
*vma
)
3692 struct file
*file
= vma
->vm_file
;
3693 struct socket
*sock
= file
->private_data
;
3694 struct sock
*sk
= sock
->sk
;
3697 atomic_inc(&pkt_sk(sk
)->mapped
);
3700 static void packet_mm_close(struct vm_area_struct
*vma
)
3702 struct file
*file
= vma
->vm_file
;
3703 struct socket
*sock
= file
->private_data
;
3704 struct sock
*sk
= sock
->sk
;
3707 atomic_dec(&pkt_sk(sk
)->mapped
);
3710 static const struct vm_operations_struct packet_mmap_ops
= {
3711 .open
= packet_mm_open
,
3712 .close
= packet_mm_close
,
3715 static void free_pg_vec(struct pgv
*pg_vec
, unsigned int order
,
3720 for (i
= 0; i
< len
; i
++) {
3721 if (likely(pg_vec
[i
].buffer
)) {
3722 if (is_vmalloc_addr(pg_vec
[i
].buffer
))
3723 vfree(pg_vec
[i
].buffer
);
3725 free_pages((unsigned long)pg_vec
[i
].buffer
,
3727 pg_vec
[i
].buffer
= NULL
;
3733 static char *alloc_one_pg_vec_page(unsigned long order
)
3736 gfp_t gfp_flags
= GFP_KERNEL
| __GFP_COMP
|
3737 __GFP_ZERO
| __GFP_NOWARN
| __GFP_NORETRY
;
3739 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
3743 /* __get_free_pages failed, fall back to vmalloc */
3744 buffer
= vzalloc((1 << order
) * PAGE_SIZE
);
3748 /* vmalloc failed, lets dig into swap here */
3749 gfp_flags
&= ~__GFP_NORETRY
;
3750 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
3754 /* complete and utter failure */
3758 static struct pgv
*alloc_pg_vec(struct tpacket_req
*req
, int order
)
3760 unsigned int block_nr
= req
->tp_block_nr
;
3764 pg_vec
= kcalloc(block_nr
, sizeof(struct pgv
), GFP_KERNEL
);
3765 if (unlikely(!pg_vec
))
3768 for (i
= 0; i
< block_nr
; i
++) {
3769 pg_vec
[i
].buffer
= alloc_one_pg_vec_page(order
);
3770 if (unlikely(!pg_vec
[i
].buffer
))
3771 goto out_free_pgvec
;
3778 free_pg_vec(pg_vec
, order
, block_nr
);
3783 static int packet_set_ring(struct sock
*sk
, union tpacket_req_u
*req_u
,
3784 int closing
, int tx_ring
)
3786 struct pgv
*pg_vec
= NULL
;
3787 struct packet_sock
*po
= pkt_sk(sk
);
3788 int was_running
, order
= 0;
3789 struct packet_ring_buffer
*rb
;
3790 struct sk_buff_head
*rb_queue
;
3793 /* Added to avoid minimal code churn */
3794 struct tpacket_req
*req
= &req_u
->req
;
3796 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
3797 if (!closing
&& tx_ring
&& (po
->tp_version
> TPACKET_V2
)) {
3798 WARN(1, "Tx-ring is not supported.\n");
3802 rb
= tx_ring
? &po
->tx_ring
: &po
->rx_ring
;
3803 rb_queue
= tx_ring
? &sk
->sk_write_queue
: &sk
->sk_receive_queue
;
3807 if (atomic_read(&po
->mapped
))
3809 if (packet_read_pending(rb
))
3813 if (req
->tp_block_nr
) {
3814 /* Sanity tests and some calculations */
3816 if (unlikely(rb
->pg_vec
))
3819 switch (po
->tp_version
) {
3821 po
->tp_hdrlen
= TPACKET_HDRLEN
;
3824 po
->tp_hdrlen
= TPACKET2_HDRLEN
;
3827 po
->tp_hdrlen
= TPACKET3_HDRLEN
;
3832 if (unlikely((int)req
->tp_block_size
<= 0))
3834 if (unlikely(req
->tp_block_size
& (PAGE_SIZE
- 1)))
3836 if (po
->tp_version
>= TPACKET_V3
&&
3837 (int)(req
->tp_block_size
-
3838 BLK_PLUS_PRIV(req_u
->req3
.tp_sizeof_priv
)) <= 0)
3840 if (unlikely(req
->tp_frame_size
< po
->tp_hdrlen
+
3843 if (unlikely(req
->tp_frame_size
& (TPACKET_ALIGNMENT
- 1)))
3846 rb
->frames_per_block
= req
->tp_block_size
/req
->tp_frame_size
;
3847 if (unlikely(rb
->frames_per_block
<= 0))
3849 if (unlikely((rb
->frames_per_block
* req
->tp_block_nr
) !=
3854 order
= get_order(req
->tp_block_size
);
3855 pg_vec
= alloc_pg_vec(req
, order
);
3856 if (unlikely(!pg_vec
))
3858 switch (po
->tp_version
) {
3860 /* Transmit path is not supported. We checked
3861 * it above but just being paranoid
3864 init_prb_bdqc(po
, rb
, pg_vec
, req_u
, tx_ring
);
3873 if (unlikely(req
->tp_frame_nr
))
3879 /* Detach socket from network */
3880 spin_lock(&po
->bind_lock
);
3881 was_running
= po
->running
;
3885 __unregister_prot_hook(sk
, false);
3887 spin_unlock(&po
->bind_lock
);
3892 mutex_lock(&po
->pg_vec_lock
);
3893 if (closing
|| atomic_read(&po
->mapped
) == 0) {
3895 spin_lock_bh(&rb_queue
->lock
);
3896 swap(rb
->pg_vec
, pg_vec
);
3897 rb
->frame_max
= (req
->tp_frame_nr
- 1);
3899 rb
->frame_size
= req
->tp_frame_size
;
3900 spin_unlock_bh(&rb_queue
->lock
);
3902 swap(rb
->pg_vec_order
, order
);
3903 swap(rb
->pg_vec_len
, req
->tp_block_nr
);
3905 rb
->pg_vec_pages
= req
->tp_block_size
/PAGE_SIZE
;
3906 po
->prot_hook
.func
= (po
->rx_ring
.pg_vec
) ?
3907 tpacket_rcv
: packet_rcv
;
3908 skb_queue_purge(rb_queue
);
3909 if (atomic_read(&po
->mapped
))
3910 pr_err("packet_mmap: vma is busy: %d\n",
3911 atomic_read(&po
->mapped
));
3913 mutex_unlock(&po
->pg_vec_lock
);
3915 spin_lock(&po
->bind_lock
);
3918 register_prot_hook(sk
);
3920 spin_unlock(&po
->bind_lock
);
3921 if (closing
&& (po
->tp_version
> TPACKET_V2
)) {
3922 /* Because we don't support block-based V3 on tx-ring */
3924 prb_shutdown_retire_blk_timer(po
, tx_ring
, rb_queue
);
3929 free_pg_vec(pg_vec
, order
, req
->tp_block_nr
);
3934 static int packet_mmap(struct file
*file
, struct socket
*sock
,
3935 struct vm_area_struct
*vma
)
3937 struct sock
*sk
= sock
->sk
;
3938 struct packet_sock
*po
= pkt_sk(sk
);
3939 unsigned long size
, expected_size
;
3940 struct packet_ring_buffer
*rb
;
3941 unsigned long start
;
3948 mutex_lock(&po
->pg_vec_lock
);
3951 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
3953 expected_size
+= rb
->pg_vec_len
3959 if (expected_size
== 0)
3962 size
= vma
->vm_end
- vma
->vm_start
;
3963 if (size
!= expected_size
)
3966 start
= vma
->vm_start
;
3967 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
3968 if (rb
->pg_vec
== NULL
)
3971 for (i
= 0; i
< rb
->pg_vec_len
; i
++) {
3973 void *kaddr
= rb
->pg_vec
[i
].buffer
;
3976 for (pg_num
= 0; pg_num
< rb
->pg_vec_pages
; pg_num
++) {
3977 page
= pgv_to_page(kaddr
);
3978 err
= vm_insert_page(vma
, start
, page
);
3987 atomic_inc(&po
->mapped
);
3988 vma
->vm_ops
= &packet_mmap_ops
;
3992 mutex_unlock(&po
->pg_vec_lock
);
3996 static const struct proto_ops packet_ops_spkt
= {
3997 .family
= PF_PACKET
,
3998 .owner
= THIS_MODULE
,
3999 .release
= packet_release
,
4000 .bind
= packet_bind_spkt
,
4001 .connect
= sock_no_connect
,
4002 .socketpair
= sock_no_socketpair
,
4003 .accept
= sock_no_accept
,
4004 .getname
= packet_getname_spkt
,
4005 .poll
= datagram_poll
,
4006 .ioctl
= packet_ioctl
,
4007 .listen
= sock_no_listen
,
4008 .shutdown
= sock_no_shutdown
,
4009 .setsockopt
= sock_no_setsockopt
,
4010 .getsockopt
= sock_no_getsockopt
,
4011 .sendmsg
= packet_sendmsg_spkt
,
4012 .recvmsg
= packet_recvmsg
,
4013 .mmap
= sock_no_mmap
,
4014 .sendpage
= sock_no_sendpage
,
4017 static const struct proto_ops packet_ops
= {
4018 .family
= PF_PACKET
,
4019 .owner
= THIS_MODULE
,
4020 .release
= packet_release
,
4021 .bind
= packet_bind
,
4022 .connect
= sock_no_connect
,
4023 .socketpair
= sock_no_socketpair
,
4024 .accept
= sock_no_accept
,
4025 .getname
= packet_getname
,
4026 .poll
= packet_poll
,
4027 .ioctl
= packet_ioctl
,
4028 .listen
= sock_no_listen
,
4029 .shutdown
= sock_no_shutdown
,
4030 .setsockopt
= packet_setsockopt
,
4031 .getsockopt
= packet_getsockopt
,
4032 .sendmsg
= packet_sendmsg
,
4033 .recvmsg
= packet_recvmsg
,
4034 .mmap
= packet_mmap
,
4035 .sendpage
= sock_no_sendpage
,
4038 static const struct net_proto_family packet_family_ops
= {
4039 .family
= PF_PACKET
,
4040 .create
= packet_create
,
4041 .owner
= THIS_MODULE
,
4044 static struct notifier_block packet_netdev_notifier
= {
4045 .notifier_call
= packet_notifier
,
4048 #ifdef CONFIG_PROC_FS
4050 static void *packet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4053 struct net
*net
= seq_file_net(seq
);
4056 return seq_hlist_start_head_rcu(&net
->packet
.sklist
, *pos
);
4059 static void *packet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4061 struct net
*net
= seq_file_net(seq
);
4062 return seq_hlist_next_rcu(v
, &net
->packet
.sklist
, pos
);
4065 static void packet_seq_stop(struct seq_file
*seq
, void *v
)
4071 static int packet_seq_show(struct seq_file
*seq
, void *v
)
4073 if (v
== SEQ_START_TOKEN
)
4074 seq_puts(seq
, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4076 struct sock
*s
= sk_entry(v
);
4077 const struct packet_sock
*po
= pkt_sk(s
);
4080 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4082 atomic_read(&s
->sk_refcnt
),
4087 atomic_read(&s
->sk_rmem_alloc
),
4088 from_kuid_munged(seq_user_ns(seq
), sock_i_uid(s
)),
4095 static const struct seq_operations packet_seq_ops
= {
4096 .start
= packet_seq_start
,
4097 .next
= packet_seq_next
,
4098 .stop
= packet_seq_stop
,
4099 .show
= packet_seq_show
,
4102 static int packet_seq_open(struct inode
*inode
, struct file
*file
)
4104 return seq_open_net(inode
, file
, &packet_seq_ops
,
4105 sizeof(struct seq_net_private
));
4108 static const struct file_operations packet_seq_fops
= {
4109 .owner
= THIS_MODULE
,
4110 .open
= packet_seq_open
,
4112 .llseek
= seq_lseek
,
4113 .release
= seq_release_net
,
4118 static int __net_init
packet_net_init(struct net
*net
)
4120 mutex_init(&net
->packet
.sklist_lock
);
4121 INIT_HLIST_HEAD(&net
->packet
.sklist
);
4123 if (!proc_create("packet", 0, net
->proc_net
, &packet_seq_fops
))
4129 static void __net_exit
packet_net_exit(struct net
*net
)
4131 remove_proc_entry("packet", net
->proc_net
);
4134 static struct pernet_operations packet_net_ops
= {
4135 .init
= packet_net_init
,
4136 .exit
= packet_net_exit
,
4140 static void __exit
packet_exit(void)
4142 unregister_netdevice_notifier(&packet_netdev_notifier
);
4143 unregister_pernet_subsys(&packet_net_ops
);
4144 sock_unregister(PF_PACKET
);
4145 proto_unregister(&packet_proto
);
4148 static int __init
packet_init(void)
4150 int rc
= proto_register(&packet_proto
, 0);
4155 sock_register(&packet_family_ops
);
4156 register_pernet_subsys(&packet_net_ops
);
4157 register_netdevice_notifier(&packet_netdev_notifier
);
4162 module_init(packet_init
);
4163 module_exit(packet_exit
);
4164 MODULE_LICENSE("GPL");
4165 MODULE_ALIAS_NETPROTO(PF_PACKET
);