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
{
219 unsigned int origlen
;
221 struct sockaddr_pkt pkt
;
222 struct sockaddr_ll ll
;
226 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
228 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
229 #define GET_PBLOCK_DESC(x, bid) \
230 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
231 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
232 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
233 #define GET_NEXT_PRB_BLK_NUM(x) \
234 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
235 ((x)->kactive_blk_num+1) : 0)
237 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
);
238 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
);
240 static int packet_direct_xmit(struct sk_buff
*skb
)
242 struct net_device
*dev
= skb
->dev
;
243 const struct net_device_ops
*ops
= dev
->netdev_ops
;
244 netdev_features_t features
;
245 struct netdev_queue
*txq
;
246 int ret
= NETDEV_TX_BUSY
;
249 if (unlikely(!netif_running(dev
) ||
250 !netif_carrier_ok(dev
)))
253 features
= netif_skb_features(skb
);
254 if (skb_needs_linearize(skb
, features
) &&
255 __skb_linearize(skb
))
258 queue_map
= skb_get_queue_mapping(skb
);
259 txq
= netdev_get_tx_queue(dev
, queue_map
);
263 HARD_TX_LOCK(dev
, txq
, smp_processor_id());
264 if (!netif_xmit_frozen_or_drv_stopped(txq
)) {
265 ret
= ops
->ndo_start_xmit(skb
, dev
);
266 if (ret
== NETDEV_TX_OK
)
267 txq_trans_update(txq
);
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 __pure
struct page
*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
;
795 if (po
->stats
.stats3
.tp_drops
)
796 status
|= TP_STATUS_LOSING
;
798 last_pkt
= (struct tpacket3_hdr
*)pkc1
->prev
;
799 last_pkt
->tp_next_offset
= 0;
801 /* Get the ts of the last pkt */
802 if (BLOCK_NUM_PKTS(pbd1
)) {
803 h1
->ts_last_pkt
.ts_sec
= last_pkt
->tp_sec
;
804 h1
->ts_last_pkt
.ts_nsec
= last_pkt
->tp_nsec
;
806 /* Ok, we tmo'd - so get the current time */
809 h1
->ts_last_pkt
.ts_sec
= ts
.tv_sec
;
810 h1
->ts_last_pkt
.ts_nsec
= ts
.tv_nsec
;
815 /* Flush the block */
816 prb_flush_block(pkc1
, pbd1
, status
);
818 pkc1
->kactive_blk_num
= GET_NEXT_PRB_BLK_NUM(pkc1
);
821 static void prb_thaw_queue(struct tpacket_kbdq_core
*pkc
)
823 pkc
->reset_pending_on_curr_blk
= 0;
827 * Side effect of opening a block:
829 * 1) prb_queue is thawed.
830 * 2) retire_blk_timer is refreshed.
833 static void prb_open_block(struct tpacket_kbdq_core
*pkc1
,
834 struct tpacket_block_desc
*pbd1
)
837 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
841 /* We could have just memset this but we will lose the
842 * flexibility of making the priv area sticky
845 BLOCK_SNUM(pbd1
) = pkc1
->knxt_seq_num
++;
846 BLOCK_NUM_PKTS(pbd1
) = 0;
847 BLOCK_LEN(pbd1
) = BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
851 h1
->ts_first_pkt
.ts_sec
= ts
.tv_sec
;
852 h1
->ts_first_pkt
.ts_nsec
= ts
.tv_nsec
;
854 pkc1
->pkblk_start
= (char *)pbd1
;
855 pkc1
->nxt_offset
= pkc1
->pkblk_start
+ BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
857 BLOCK_O2FP(pbd1
) = (__u32
)BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
858 BLOCK_O2PRIV(pbd1
) = BLK_HDR_LEN
;
860 pbd1
->version
= pkc1
->version
;
861 pkc1
->prev
= pkc1
->nxt_offset
;
862 pkc1
->pkblk_end
= pkc1
->pkblk_start
+ pkc1
->kblk_size
;
864 prb_thaw_queue(pkc1
);
865 _prb_refresh_rx_retire_blk_timer(pkc1
);
871 * Queue freeze logic:
872 * 1) Assume tp_block_nr = 8 blocks.
873 * 2) At time 't0', user opens Rx ring.
874 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
875 * 4) user-space is either sleeping or processing block '0'.
876 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
877 * it will close block-7,loop around and try to fill block '0'.
879 * __packet_lookup_frame_in_block
880 * prb_retire_current_block()
881 * prb_dispatch_next_block()
882 * |->(BLOCK_STATUS == USER) evaluates to true
883 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
884 * 6) Now there are two cases:
885 * 6.1) Link goes idle right after the queue is frozen.
886 * But remember, the last open_block() refreshed the timer.
887 * When this timer expires,it will refresh itself so that we can
888 * re-open block-0 in near future.
889 * 6.2) Link is busy and keeps on receiving packets. This is a simple
890 * case and __packet_lookup_frame_in_block will check if block-0
891 * is free and can now be re-used.
893 static void prb_freeze_queue(struct tpacket_kbdq_core
*pkc
,
894 struct packet_sock
*po
)
896 pkc
->reset_pending_on_curr_blk
= 1;
897 po
->stats
.stats3
.tp_freeze_q_cnt
++;
900 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
903 * If the next block is free then we will dispatch it
904 * and return a good offset.
905 * Else, we will freeze the queue.
906 * So, caller must check the return value.
908 static void *prb_dispatch_next_block(struct tpacket_kbdq_core
*pkc
,
909 struct packet_sock
*po
)
911 struct tpacket_block_desc
*pbd
;
915 /* 1. Get current block num */
916 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
918 /* 2. If this block is currently in_use then freeze the queue */
919 if (TP_STATUS_USER
& BLOCK_STATUS(pbd
)) {
920 prb_freeze_queue(pkc
, po
);
926 * open this block and return the offset where the first packet
927 * needs to get stored.
929 prb_open_block(pkc
, pbd
);
930 return (void *)pkc
->nxt_offset
;
933 static void prb_retire_current_block(struct tpacket_kbdq_core
*pkc
,
934 struct packet_sock
*po
, unsigned int status
)
936 struct tpacket_block_desc
*pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
938 /* retire/close the current block */
939 if (likely(TP_STATUS_KERNEL
== BLOCK_STATUS(pbd
))) {
941 * Plug the case where copy_bits() is in progress on
942 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
943 * have space to copy the pkt in the current block and
944 * called prb_retire_current_block()
946 * We don't need to worry about the TMO case because
947 * the timer-handler already handled this case.
949 if (!(status
& TP_STATUS_BLK_TMO
)) {
950 while (atomic_read(&pkc
->blk_fill_in_prog
)) {
951 /* Waiting for skb_copy_bits to finish... */
955 prb_close_block(pkc
, pbd
, po
, status
);
960 static int prb_curr_blk_in_use(struct tpacket_kbdq_core
*pkc
,
961 struct tpacket_block_desc
*pbd
)
963 return TP_STATUS_USER
& BLOCK_STATUS(pbd
);
966 static int prb_queue_frozen(struct tpacket_kbdq_core
*pkc
)
968 return pkc
->reset_pending_on_curr_blk
;
971 static void prb_clear_blk_fill_status(struct packet_ring_buffer
*rb
)
973 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
974 atomic_dec(&pkc
->blk_fill_in_prog
);
977 static void prb_fill_rxhash(struct tpacket_kbdq_core
*pkc
,
978 struct tpacket3_hdr
*ppd
)
980 ppd
->hv1
.tp_rxhash
= skb_get_hash(pkc
->skb
);
983 static void prb_clear_rxhash(struct tpacket_kbdq_core
*pkc
,
984 struct tpacket3_hdr
*ppd
)
986 ppd
->hv1
.tp_rxhash
= 0;
989 static void prb_fill_vlan_info(struct tpacket_kbdq_core
*pkc
,
990 struct tpacket3_hdr
*ppd
)
992 if (vlan_tx_tag_present(pkc
->skb
)) {
993 ppd
->hv1
.tp_vlan_tci
= vlan_tx_tag_get(pkc
->skb
);
994 ppd
->hv1
.tp_vlan_tpid
= ntohs(pkc
->skb
->vlan_proto
);
995 ppd
->tp_status
= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
997 ppd
->hv1
.tp_vlan_tci
= 0;
998 ppd
->hv1
.tp_vlan_tpid
= 0;
999 ppd
->tp_status
= TP_STATUS_AVAILABLE
;
1003 static void prb_run_all_ft_ops(struct tpacket_kbdq_core
*pkc
,
1004 struct tpacket3_hdr
*ppd
)
1006 ppd
->hv1
.tp_padding
= 0;
1007 prb_fill_vlan_info(pkc
, ppd
);
1009 if (pkc
->feature_req_word
& TP_FT_REQ_FILL_RXHASH
)
1010 prb_fill_rxhash(pkc
, ppd
);
1012 prb_clear_rxhash(pkc
, ppd
);
1015 static void prb_fill_curr_block(char *curr
,
1016 struct tpacket_kbdq_core
*pkc
,
1017 struct tpacket_block_desc
*pbd
,
1020 struct tpacket3_hdr
*ppd
;
1022 ppd
= (struct tpacket3_hdr
*)curr
;
1023 ppd
->tp_next_offset
= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1025 pkc
->nxt_offset
+= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1026 BLOCK_LEN(pbd
) += TOTAL_PKT_LEN_INCL_ALIGN(len
);
1027 BLOCK_NUM_PKTS(pbd
) += 1;
1028 atomic_inc(&pkc
->blk_fill_in_prog
);
1029 prb_run_all_ft_ops(pkc
, ppd
);
1032 /* Assumes caller has the sk->rx_queue.lock */
1033 static void *__packet_lookup_frame_in_block(struct packet_sock
*po
,
1034 struct sk_buff
*skb
,
1039 struct tpacket_kbdq_core
*pkc
;
1040 struct tpacket_block_desc
*pbd
;
1043 pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
1044 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1046 /* Queue is frozen when user space is lagging behind */
1047 if (prb_queue_frozen(pkc
)) {
1049 * Check if that last block which caused the queue to freeze,
1050 * is still in_use by user-space.
1052 if (prb_curr_blk_in_use(pkc
, pbd
)) {
1053 /* Can't record this packet */
1057 * Ok, the block was released by user-space.
1058 * Now let's open that block.
1059 * opening a block also thaws the queue.
1060 * Thawing is a side effect.
1062 prb_open_block(pkc
, pbd
);
1067 curr
= pkc
->nxt_offset
;
1069 end
= (char *)pbd
+ pkc
->kblk_size
;
1071 /* first try the current block */
1072 if (curr
+TOTAL_PKT_LEN_INCL_ALIGN(len
) < end
) {
1073 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1074 return (void *)curr
;
1077 /* Ok, close the current block */
1078 prb_retire_current_block(pkc
, po
, 0);
1080 /* Now, try to dispatch the next block */
1081 curr
= (char *)prb_dispatch_next_block(pkc
, po
);
1083 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1084 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1085 return (void *)curr
;
1089 * No free blocks are available.user_space hasn't caught up yet.
1090 * Queue was just frozen and now this packet will get dropped.
1095 static void *packet_current_rx_frame(struct packet_sock
*po
,
1096 struct sk_buff
*skb
,
1097 int status
, unsigned int len
)
1100 switch (po
->tp_version
) {
1103 curr
= packet_lookup_frame(po
, &po
->rx_ring
,
1104 po
->rx_ring
.head
, status
);
1107 return __packet_lookup_frame_in_block(po
, skb
, status
, len
);
1109 WARN(1, "TPACKET version not supported\n");
1115 static void *prb_lookup_block(struct packet_sock
*po
,
1116 struct packet_ring_buffer
*rb
,
1120 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
1121 struct tpacket_block_desc
*pbd
= GET_PBLOCK_DESC(pkc
, idx
);
1123 if (status
!= BLOCK_STATUS(pbd
))
1128 static int prb_previous_blk_num(struct packet_ring_buffer
*rb
)
1131 if (rb
->prb_bdqc
.kactive_blk_num
)
1132 prev
= rb
->prb_bdqc
.kactive_blk_num
-1;
1134 prev
= rb
->prb_bdqc
.knum_blocks
-1;
1138 /* Assumes caller has held the rx_queue.lock */
1139 static void *__prb_previous_block(struct packet_sock
*po
,
1140 struct packet_ring_buffer
*rb
,
1143 unsigned int previous
= prb_previous_blk_num(rb
);
1144 return prb_lookup_block(po
, rb
, previous
, status
);
1147 static void *packet_previous_rx_frame(struct packet_sock
*po
,
1148 struct packet_ring_buffer
*rb
,
1151 if (po
->tp_version
<= TPACKET_V2
)
1152 return packet_previous_frame(po
, rb
, status
);
1154 return __prb_previous_block(po
, rb
, status
);
1157 static void packet_increment_rx_head(struct packet_sock
*po
,
1158 struct packet_ring_buffer
*rb
)
1160 switch (po
->tp_version
) {
1163 return packet_increment_head(rb
);
1166 WARN(1, "TPACKET version not supported.\n");
1172 static void *packet_previous_frame(struct packet_sock
*po
,
1173 struct packet_ring_buffer
*rb
,
1176 unsigned int previous
= rb
->head
? rb
->head
- 1 : rb
->frame_max
;
1177 return packet_lookup_frame(po
, rb
, previous
, status
);
1180 static void packet_increment_head(struct packet_ring_buffer
*buff
)
1182 buff
->head
= buff
->head
!= buff
->frame_max
? buff
->head
+1 : 0;
1185 static void packet_inc_pending(struct packet_ring_buffer
*rb
)
1187 this_cpu_inc(*rb
->pending_refcnt
);
1190 static void packet_dec_pending(struct packet_ring_buffer
*rb
)
1192 this_cpu_dec(*rb
->pending_refcnt
);
1195 static unsigned int packet_read_pending(const struct packet_ring_buffer
*rb
)
1197 unsigned int refcnt
= 0;
1200 /* We don't use pending refcount in rx_ring. */
1201 if (rb
->pending_refcnt
== NULL
)
1204 for_each_possible_cpu(cpu
)
1205 refcnt
+= *per_cpu_ptr(rb
->pending_refcnt
, cpu
);
1210 static int packet_alloc_pending(struct packet_sock
*po
)
1212 po
->rx_ring
.pending_refcnt
= NULL
;
1214 po
->tx_ring
.pending_refcnt
= alloc_percpu(unsigned int);
1215 if (unlikely(po
->tx_ring
.pending_refcnt
== NULL
))
1221 static void packet_free_pending(struct packet_sock
*po
)
1223 free_percpu(po
->tx_ring
.pending_refcnt
);
1226 static bool packet_rcv_has_room(struct packet_sock
*po
, struct sk_buff
*skb
)
1228 struct sock
*sk
= &po
->sk
;
1231 if (po
->prot_hook
.func
!= tpacket_rcv
)
1232 return (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
)
1235 spin_lock(&sk
->sk_receive_queue
.lock
);
1236 if (po
->tp_version
== TPACKET_V3
)
1237 has_room
= prb_lookup_block(po
, &po
->rx_ring
,
1238 po
->rx_ring
.prb_bdqc
.kactive_blk_num
,
1241 has_room
= packet_lookup_frame(po
, &po
->rx_ring
,
1244 spin_unlock(&sk
->sk_receive_queue
.lock
);
1249 static void packet_sock_destruct(struct sock
*sk
)
1251 skb_queue_purge(&sk
->sk_error_queue
);
1253 WARN_ON(atomic_read(&sk
->sk_rmem_alloc
));
1254 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
1256 if (!sock_flag(sk
, SOCK_DEAD
)) {
1257 pr_err("Attempt to release alive packet socket: %p\n", sk
);
1261 sk_refcnt_debug_dec(sk
);
1264 static int fanout_rr_next(struct packet_fanout
*f
, unsigned int num
)
1266 int x
= atomic_read(&f
->rr_cur
) + 1;
1274 static unsigned int fanout_demux_hash(struct packet_fanout
*f
,
1275 struct sk_buff
*skb
,
1278 return reciprocal_scale(skb_get_hash(skb
), num
);
1281 static unsigned int fanout_demux_lb(struct packet_fanout
*f
,
1282 struct sk_buff
*skb
,
1287 cur
= atomic_read(&f
->rr_cur
);
1288 while ((old
= atomic_cmpxchg(&f
->rr_cur
, cur
,
1289 fanout_rr_next(f
, num
))) != cur
)
1294 static unsigned int fanout_demux_cpu(struct packet_fanout
*f
,
1295 struct sk_buff
*skb
,
1298 return smp_processor_id() % num
;
1301 static unsigned int fanout_demux_rnd(struct packet_fanout
*f
,
1302 struct sk_buff
*skb
,
1305 return prandom_u32_max(num
);
1308 static unsigned int fanout_demux_rollover(struct packet_fanout
*f
,
1309 struct sk_buff
*skb
,
1310 unsigned int idx
, unsigned int skip
,
1315 i
= j
= min_t(int, f
->next
[idx
], num
- 1);
1317 if (i
!= skip
&& packet_rcv_has_room(pkt_sk(f
->arr
[i
]), skb
)) {
1329 static unsigned int fanout_demux_qm(struct packet_fanout
*f
,
1330 struct sk_buff
*skb
,
1333 return skb_get_queue_mapping(skb
) % num
;
1336 static bool fanout_has_flag(struct packet_fanout
*f
, u16 flag
)
1338 return f
->flags
& (flag
>> 8);
1341 static int packet_rcv_fanout(struct sk_buff
*skb
, struct net_device
*dev
,
1342 struct packet_type
*pt
, struct net_device
*orig_dev
)
1344 struct packet_fanout
*f
= pt
->af_packet_priv
;
1345 unsigned int num
= f
->num_members
;
1346 struct packet_sock
*po
;
1349 if (!net_eq(dev_net(dev
), read_pnet(&f
->net
)) ||
1356 case PACKET_FANOUT_HASH
:
1358 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_DEFRAG
)) {
1359 skb
= ip_check_defrag(skb
, IP_DEFRAG_AF_PACKET
);
1363 idx
= fanout_demux_hash(f
, skb
, num
);
1365 case PACKET_FANOUT_LB
:
1366 idx
= fanout_demux_lb(f
, skb
, num
);
1368 case PACKET_FANOUT_CPU
:
1369 idx
= fanout_demux_cpu(f
, skb
, num
);
1371 case PACKET_FANOUT_RND
:
1372 idx
= fanout_demux_rnd(f
, skb
, num
);
1374 case PACKET_FANOUT_QM
:
1375 idx
= fanout_demux_qm(f
, skb
, num
);
1377 case PACKET_FANOUT_ROLLOVER
:
1378 idx
= fanout_demux_rollover(f
, skb
, 0, (unsigned int) -1, num
);
1382 po
= pkt_sk(f
->arr
[idx
]);
1383 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_ROLLOVER
) &&
1384 unlikely(!packet_rcv_has_room(po
, skb
))) {
1385 idx
= fanout_demux_rollover(f
, skb
, idx
, idx
, num
);
1386 po
= pkt_sk(f
->arr
[idx
]);
1389 return po
->prot_hook
.func(skb
, dev
, &po
->prot_hook
, orig_dev
);
1392 DEFINE_MUTEX(fanout_mutex
);
1393 EXPORT_SYMBOL_GPL(fanout_mutex
);
1394 static LIST_HEAD(fanout_list
);
1396 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
)
1398 struct packet_fanout
*f
= po
->fanout
;
1400 spin_lock(&f
->lock
);
1401 f
->arr
[f
->num_members
] = sk
;
1404 spin_unlock(&f
->lock
);
1407 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
)
1409 struct packet_fanout
*f
= po
->fanout
;
1412 spin_lock(&f
->lock
);
1413 for (i
= 0; i
< f
->num_members
; i
++) {
1414 if (f
->arr
[i
] == sk
)
1417 BUG_ON(i
>= f
->num_members
);
1418 f
->arr
[i
] = f
->arr
[f
->num_members
- 1];
1420 spin_unlock(&f
->lock
);
1423 static bool match_fanout_group(struct packet_type
*ptype
, struct sock
*sk
)
1425 if (ptype
->af_packet_priv
== (void *)((struct packet_sock
*)sk
)->fanout
)
1431 static int fanout_add(struct sock
*sk
, u16 id
, u16 type_flags
)
1433 struct packet_sock
*po
= pkt_sk(sk
);
1434 struct packet_fanout
*f
, *match
;
1435 u8 type
= type_flags
& 0xff;
1436 u8 flags
= type_flags
>> 8;
1440 case PACKET_FANOUT_ROLLOVER
:
1441 if (type_flags
& PACKET_FANOUT_FLAG_ROLLOVER
)
1443 case PACKET_FANOUT_HASH
:
1444 case PACKET_FANOUT_LB
:
1445 case PACKET_FANOUT_CPU
:
1446 case PACKET_FANOUT_RND
:
1447 case PACKET_FANOUT_QM
:
1459 mutex_lock(&fanout_mutex
);
1461 list_for_each_entry(f
, &fanout_list
, list
) {
1463 read_pnet(&f
->net
) == sock_net(sk
)) {
1469 if (match
&& match
->flags
!= flags
)
1473 match
= kzalloc(sizeof(*match
), GFP_KERNEL
);
1476 write_pnet(&match
->net
, sock_net(sk
));
1479 match
->flags
= flags
;
1480 atomic_set(&match
->rr_cur
, 0);
1481 INIT_LIST_HEAD(&match
->list
);
1482 spin_lock_init(&match
->lock
);
1483 atomic_set(&match
->sk_ref
, 0);
1484 match
->prot_hook
.type
= po
->prot_hook
.type
;
1485 match
->prot_hook
.dev
= po
->prot_hook
.dev
;
1486 match
->prot_hook
.func
= packet_rcv_fanout
;
1487 match
->prot_hook
.af_packet_priv
= match
;
1488 match
->prot_hook
.id_match
= match_fanout_group
;
1489 dev_add_pack(&match
->prot_hook
);
1490 list_add(&match
->list
, &fanout_list
);
1493 if (match
->type
== type
&&
1494 match
->prot_hook
.type
== po
->prot_hook
.type
&&
1495 match
->prot_hook
.dev
== po
->prot_hook
.dev
) {
1497 if (atomic_read(&match
->sk_ref
) < PACKET_FANOUT_MAX
) {
1498 __dev_remove_pack(&po
->prot_hook
);
1500 atomic_inc(&match
->sk_ref
);
1501 __fanout_link(sk
, po
);
1506 mutex_unlock(&fanout_mutex
);
1510 static void fanout_release(struct sock
*sk
)
1512 struct packet_sock
*po
= pkt_sk(sk
);
1513 struct packet_fanout
*f
;
1519 mutex_lock(&fanout_mutex
);
1522 if (atomic_dec_and_test(&f
->sk_ref
)) {
1524 dev_remove_pack(&f
->prot_hook
);
1527 mutex_unlock(&fanout_mutex
);
1530 static const struct proto_ops packet_ops
;
1532 static const struct proto_ops packet_ops_spkt
;
1534 static int packet_rcv_spkt(struct sk_buff
*skb
, struct net_device
*dev
,
1535 struct packet_type
*pt
, struct net_device
*orig_dev
)
1538 struct sockaddr_pkt
*spkt
;
1541 * When we registered the protocol we saved the socket in the data
1542 * field for just this event.
1545 sk
= pt
->af_packet_priv
;
1548 * Yank back the headers [hope the device set this
1549 * right or kerboom...]
1551 * Incoming packets have ll header pulled,
1554 * For outgoing ones skb->data == skb_mac_header(skb)
1555 * so that this procedure is noop.
1558 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1561 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1564 skb
= skb_share_check(skb
, GFP_ATOMIC
);
1568 /* drop any routing info */
1571 /* drop conntrack reference */
1574 spkt
= &PACKET_SKB_CB(skb
)->sa
.pkt
;
1576 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1579 * The SOCK_PACKET socket receives _all_ frames.
1582 spkt
->spkt_family
= dev
->type
;
1583 strlcpy(spkt
->spkt_device
, dev
->name
, sizeof(spkt
->spkt_device
));
1584 spkt
->spkt_protocol
= skb
->protocol
;
1587 * Charge the memory to the socket. This is done specifically
1588 * to prevent sockets using all the memory up.
1591 if (sock_queue_rcv_skb(sk
, skb
) == 0)
1602 * Output a raw packet to a device layer. This bypasses all the other
1603 * protocol layers and you must therefore supply it with a complete frame
1606 static int packet_sendmsg_spkt(struct kiocb
*iocb
, struct socket
*sock
,
1607 struct msghdr
*msg
, size_t len
)
1609 struct sock
*sk
= sock
->sk
;
1610 DECLARE_SOCKADDR(struct sockaddr_pkt
*, saddr
, msg
->msg_name
);
1611 struct sk_buff
*skb
= NULL
;
1612 struct net_device
*dev
;
1618 * Get and verify the address.
1622 if (msg
->msg_namelen
< sizeof(struct sockaddr
))
1624 if (msg
->msg_namelen
== sizeof(struct sockaddr_pkt
))
1625 proto
= saddr
->spkt_protocol
;
1627 return -ENOTCONN
; /* SOCK_PACKET must be sent giving an address */
1630 * Find the device first to size check it
1633 saddr
->spkt_device
[sizeof(saddr
->spkt_device
) - 1] = 0;
1636 dev
= dev_get_by_name_rcu(sock_net(sk
), saddr
->spkt_device
);
1642 if (!(dev
->flags
& IFF_UP
))
1646 * You may not queue a frame bigger than the mtu. This is the lowest level
1647 * raw protocol and you must do your own fragmentation at this level.
1650 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
1651 if (!netif_supports_nofcs(dev
)) {
1652 err
= -EPROTONOSUPPORT
;
1655 extra_len
= 4; /* We're doing our own CRC */
1659 if (len
> dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
+ extra_len
)
1663 size_t reserved
= LL_RESERVED_SPACE(dev
);
1664 int tlen
= dev
->needed_tailroom
;
1665 unsigned int hhlen
= dev
->header_ops
? dev
->hard_header_len
: 0;
1668 skb
= sock_wmalloc(sk
, len
+ reserved
+ tlen
, 0, GFP_KERNEL
);
1671 /* FIXME: Save some space for broken drivers that write a hard
1672 * header at transmission time by themselves. PPP is the notable
1673 * one here. This should really be fixed at the driver level.
1675 skb_reserve(skb
, reserved
);
1676 skb_reset_network_header(skb
);
1678 /* Try to align data part correctly */
1683 skb_reset_network_header(skb
);
1685 err
= memcpy_fromiovec(skb_put(skb
, len
), msg
->msg_iov
, len
);
1691 if (len
> (dev
->mtu
+ dev
->hard_header_len
+ extra_len
)) {
1692 /* Earlier code assumed this would be a VLAN pkt,
1693 * double-check this now that we have the actual
1696 struct ethhdr
*ehdr
;
1697 skb_reset_mac_header(skb
);
1698 ehdr
= eth_hdr(skb
);
1699 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
1705 skb
->protocol
= proto
;
1707 skb
->priority
= sk
->sk_priority
;
1708 skb
->mark
= sk
->sk_mark
;
1710 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
1712 if (unlikely(extra_len
== 4))
1715 skb_probe_transport_header(skb
, 0);
1717 dev_queue_xmit(skb
);
1728 static unsigned int run_filter(const struct sk_buff
*skb
,
1729 const struct sock
*sk
,
1732 struct sk_filter
*filter
;
1735 filter
= rcu_dereference(sk
->sk_filter
);
1737 res
= SK_RUN_FILTER(filter
, skb
);
1744 * This function makes lazy skb cloning in hope that most of packets
1745 * are discarded by BPF.
1747 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1748 * and skb->cb are mangled. It works because (and until) packets
1749 * falling here are owned by current CPU. Output packets are cloned
1750 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1751 * sequencially, so that if we return skb to original state on exit,
1752 * we will not harm anyone.
1755 static int packet_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1756 struct packet_type
*pt
, struct net_device
*orig_dev
)
1759 struct sockaddr_ll
*sll
;
1760 struct packet_sock
*po
;
1761 u8
*skb_head
= skb
->data
;
1762 int skb_len
= skb
->len
;
1763 unsigned int snaplen
, res
;
1765 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1768 sk
= pt
->af_packet_priv
;
1771 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1776 if (dev
->header_ops
) {
1777 /* The device has an explicit notion of ll header,
1778 * exported to higher levels.
1780 * Otherwise, the device hides details of its frame
1781 * structure, so that corresponding packet head is
1782 * never delivered to user.
1784 if (sk
->sk_type
!= SOCK_DGRAM
)
1785 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1786 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
1787 /* Special case: outgoing packets have ll header at head */
1788 skb_pull(skb
, skb_network_offset(skb
));
1794 res
= run_filter(skb
, sk
, snaplen
);
1796 goto drop_n_restore
;
1800 if (atomic_read(&sk
->sk_rmem_alloc
) >= sk
->sk_rcvbuf
)
1803 if (skb_shared(skb
)) {
1804 struct sk_buff
*nskb
= skb_clone(skb
, GFP_ATOMIC
);
1808 if (skb_head
!= skb
->data
) {
1809 skb
->data
= skb_head
;
1816 BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb
)) + MAX_ADDR_LEN
- 8 >
1819 sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
1820 sll
->sll_family
= AF_PACKET
;
1821 sll
->sll_hatype
= dev
->type
;
1822 sll
->sll_protocol
= skb
->protocol
;
1823 sll
->sll_pkttype
= skb
->pkt_type
;
1824 if (unlikely(po
->origdev
))
1825 sll
->sll_ifindex
= orig_dev
->ifindex
;
1827 sll
->sll_ifindex
= dev
->ifindex
;
1829 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
1831 PACKET_SKB_CB(skb
)->origlen
= skb
->len
;
1833 if (pskb_trim(skb
, snaplen
))
1836 skb_set_owner_r(skb
, sk
);
1840 /* drop conntrack reference */
1843 spin_lock(&sk
->sk_receive_queue
.lock
);
1844 po
->stats
.stats1
.tp_packets
++;
1845 skb
->dropcount
= atomic_read(&sk
->sk_drops
);
1846 __skb_queue_tail(&sk
->sk_receive_queue
, skb
);
1847 spin_unlock(&sk
->sk_receive_queue
.lock
);
1848 sk
->sk_data_ready(sk
);
1852 spin_lock(&sk
->sk_receive_queue
.lock
);
1853 po
->stats
.stats1
.tp_drops
++;
1854 atomic_inc(&sk
->sk_drops
);
1855 spin_unlock(&sk
->sk_receive_queue
.lock
);
1858 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
1859 skb
->data
= skb_head
;
1867 static int tpacket_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1868 struct packet_type
*pt
, struct net_device
*orig_dev
)
1871 struct packet_sock
*po
;
1872 struct sockaddr_ll
*sll
;
1873 union tpacket_uhdr h
;
1874 u8
*skb_head
= skb
->data
;
1875 int skb_len
= skb
->len
;
1876 unsigned int snaplen
, res
;
1877 unsigned long status
= TP_STATUS_USER
;
1878 unsigned short macoff
, netoff
, hdrlen
;
1879 struct sk_buff
*copy_skb
= NULL
;
1883 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
1884 * We may add members to them until current aligned size without forcing
1885 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
1887 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h2
)) != 32);
1888 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h3
)) != 48);
1890 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1893 sk
= pt
->af_packet_priv
;
1896 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1899 if (dev
->header_ops
) {
1900 if (sk
->sk_type
!= SOCK_DGRAM
)
1901 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1902 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
1903 /* Special case: outgoing packets have ll header at head */
1904 skb_pull(skb
, skb_network_offset(skb
));
1908 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
1909 status
|= TP_STATUS_CSUMNOTREADY
;
1913 res
= run_filter(skb
, sk
, snaplen
);
1915 goto drop_n_restore
;
1919 if (sk
->sk_type
== SOCK_DGRAM
) {
1920 macoff
= netoff
= TPACKET_ALIGN(po
->tp_hdrlen
) + 16 +
1923 unsigned int maclen
= skb_network_offset(skb
);
1924 netoff
= TPACKET_ALIGN(po
->tp_hdrlen
+
1925 (maclen
< 16 ? 16 : maclen
)) +
1927 macoff
= netoff
- maclen
;
1929 if (po
->tp_version
<= TPACKET_V2
) {
1930 if (macoff
+ snaplen
> po
->rx_ring
.frame_size
) {
1931 if (po
->copy_thresh
&&
1932 atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
1933 if (skb_shared(skb
)) {
1934 copy_skb
= skb_clone(skb
, GFP_ATOMIC
);
1936 copy_skb
= skb_get(skb
);
1937 skb_head
= skb
->data
;
1940 skb_set_owner_r(copy_skb
, sk
);
1942 snaplen
= po
->rx_ring
.frame_size
- macoff
;
1943 if ((int)snaplen
< 0)
1946 } else if (unlikely(macoff
+ snaplen
>
1947 GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
)) {
1950 nval
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
- macoff
;
1951 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
1952 snaplen
, nval
, macoff
);
1954 if (unlikely((int)snaplen
< 0)) {
1956 macoff
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
;
1959 spin_lock(&sk
->sk_receive_queue
.lock
);
1960 h
.raw
= packet_current_rx_frame(po
, skb
,
1961 TP_STATUS_KERNEL
, (macoff
+snaplen
));
1964 if (po
->tp_version
<= TPACKET_V2
) {
1965 packet_increment_rx_head(po
, &po
->rx_ring
);
1967 * LOSING will be reported till you read the stats,
1968 * because it's COR - Clear On Read.
1969 * Anyways, moving it for V1/V2 only as V3 doesn't need this
1972 if (po
->stats
.stats1
.tp_drops
)
1973 status
|= TP_STATUS_LOSING
;
1975 po
->stats
.stats1
.tp_packets
++;
1977 status
|= TP_STATUS_COPY
;
1978 __skb_queue_tail(&sk
->sk_receive_queue
, copy_skb
);
1980 spin_unlock(&sk
->sk_receive_queue
.lock
);
1982 skb_copy_bits(skb
, 0, h
.raw
+ macoff
, snaplen
);
1984 if (!(ts_status
= tpacket_get_timestamp(skb
, &ts
, po
->tp_tstamp
)))
1985 getnstimeofday(&ts
);
1987 status
|= ts_status
;
1989 switch (po
->tp_version
) {
1991 h
.h1
->tp_len
= skb
->len
;
1992 h
.h1
->tp_snaplen
= snaplen
;
1993 h
.h1
->tp_mac
= macoff
;
1994 h
.h1
->tp_net
= netoff
;
1995 h
.h1
->tp_sec
= ts
.tv_sec
;
1996 h
.h1
->tp_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
1997 hdrlen
= sizeof(*h
.h1
);
2000 h
.h2
->tp_len
= skb
->len
;
2001 h
.h2
->tp_snaplen
= snaplen
;
2002 h
.h2
->tp_mac
= macoff
;
2003 h
.h2
->tp_net
= netoff
;
2004 h
.h2
->tp_sec
= ts
.tv_sec
;
2005 h
.h2
->tp_nsec
= ts
.tv_nsec
;
2006 if (vlan_tx_tag_present(skb
)) {
2007 h
.h2
->tp_vlan_tci
= vlan_tx_tag_get(skb
);
2008 h
.h2
->tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
2009 status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
2011 h
.h2
->tp_vlan_tci
= 0;
2012 h
.h2
->tp_vlan_tpid
= 0;
2014 memset(h
.h2
->tp_padding
, 0, sizeof(h
.h2
->tp_padding
));
2015 hdrlen
= sizeof(*h
.h2
);
2018 /* tp_nxt_offset,vlan are already populated above.
2019 * So DONT clear those fields here
2021 h
.h3
->tp_status
|= status
;
2022 h
.h3
->tp_len
= skb
->len
;
2023 h
.h3
->tp_snaplen
= snaplen
;
2024 h
.h3
->tp_mac
= macoff
;
2025 h
.h3
->tp_net
= netoff
;
2026 h
.h3
->tp_sec
= ts
.tv_sec
;
2027 h
.h3
->tp_nsec
= ts
.tv_nsec
;
2028 memset(h
.h3
->tp_padding
, 0, sizeof(h
.h3
->tp_padding
));
2029 hdrlen
= sizeof(*h
.h3
);
2035 sll
= h
.raw
+ TPACKET_ALIGN(hdrlen
);
2036 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
2037 sll
->sll_family
= AF_PACKET
;
2038 sll
->sll_hatype
= dev
->type
;
2039 sll
->sll_protocol
= skb
->protocol
;
2040 sll
->sll_pkttype
= skb
->pkt_type
;
2041 if (unlikely(po
->origdev
))
2042 sll
->sll_ifindex
= orig_dev
->ifindex
;
2044 sll
->sll_ifindex
= dev
->ifindex
;
2048 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2049 if (po
->tp_version
<= TPACKET_V2
) {
2052 end
= (u8
*) PAGE_ALIGN((unsigned long) h
.raw
+
2055 for (start
= h
.raw
; start
< end
; start
+= PAGE_SIZE
)
2056 flush_dcache_page(pgv_to_page(start
));
2061 if (po
->tp_version
<= TPACKET_V2
)
2062 __packet_set_status(po
, h
.raw
, status
);
2064 prb_clear_blk_fill_status(&po
->rx_ring
);
2066 sk
->sk_data_ready(sk
);
2069 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
2070 skb
->data
= skb_head
;
2078 po
->stats
.stats1
.tp_drops
++;
2079 spin_unlock(&sk
->sk_receive_queue
.lock
);
2081 sk
->sk_data_ready(sk
);
2082 kfree_skb(copy_skb
);
2083 goto drop_n_restore
;
2086 static void tpacket_destruct_skb(struct sk_buff
*skb
)
2088 struct packet_sock
*po
= pkt_sk(skb
->sk
);
2090 if (likely(po
->tx_ring
.pg_vec
)) {
2094 ph
= skb_shinfo(skb
)->destructor_arg
;
2095 packet_dec_pending(&po
->tx_ring
);
2097 ts
= __packet_set_timestamp(po
, ph
, skb
);
2098 __packet_set_status(po
, ph
, TP_STATUS_AVAILABLE
| ts
);
2104 static int tpacket_fill_skb(struct packet_sock
*po
, struct sk_buff
*skb
,
2105 void *frame
, struct net_device
*dev
, int size_max
,
2106 __be16 proto
, unsigned char *addr
, int hlen
)
2108 union tpacket_uhdr ph
;
2109 int to_write
, offset
, len
, tp_len
, nr_frags
, len_max
;
2110 struct socket
*sock
= po
->sk
.sk_socket
;
2117 skb
->protocol
= proto
;
2119 skb
->priority
= po
->sk
.sk_priority
;
2120 skb
->mark
= po
->sk
.sk_mark
;
2121 sock_tx_timestamp(&po
->sk
, &skb_shinfo(skb
)->tx_flags
);
2122 skb_shinfo(skb
)->destructor_arg
= ph
.raw
;
2124 switch (po
->tp_version
) {
2126 tp_len
= ph
.h2
->tp_len
;
2129 tp_len
= ph
.h1
->tp_len
;
2132 if (unlikely(tp_len
> size_max
)) {
2133 pr_err("packet size is too long (%d > %d)\n", tp_len
, size_max
);
2137 skb_reserve(skb
, hlen
);
2138 skb_reset_network_header(skb
);
2140 if (!packet_use_direct_xmit(po
))
2141 skb_probe_transport_header(skb
, 0);
2142 if (unlikely(po
->tp_tx_has_off
)) {
2143 int off_min
, off_max
, off
;
2144 off_min
= po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2145 off_max
= po
->tx_ring
.frame_size
- tp_len
;
2146 if (sock
->type
== SOCK_DGRAM
) {
2147 switch (po
->tp_version
) {
2149 off
= ph
.h2
->tp_net
;
2152 off
= ph
.h1
->tp_net
;
2156 switch (po
->tp_version
) {
2158 off
= ph
.h2
->tp_mac
;
2161 off
= ph
.h1
->tp_mac
;
2165 if (unlikely((off
< off_min
) || (off_max
< off
)))
2167 data
= ph
.raw
+ off
;
2169 data
= ph
.raw
+ po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2173 if (sock
->type
== SOCK_DGRAM
) {
2174 err
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
,
2176 if (unlikely(err
< 0))
2178 } else if (dev
->hard_header_len
) {
2179 /* net device doesn't like empty head */
2180 if (unlikely(tp_len
<= dev
->hard_header_len
)) {
2181 pr_err("packet size is too short (%d < %d)\n",
2182 tp_len
, dev
->hard_header_len
);
2186 skb_push(skb
, dev
->hard_header_len
);
2187 err
= skb_store_bits(skb
, 0, data
,
2188 dev
->hard_header_len
);
2192 data
+= dev
->hard_header_len
;
2193 to_write
-= dev
->hard_header_len
;
2196 offset
= offset_in_page(data
);
2197 len_max
= PAGE_SIZE
- offset
;
2198 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2200 skb
->data_len
= to_write
;
2201 skb
->len
+= to_write
;
2202 skb
->truesize
+= to_write
;
2203 atomic_add(to_write
, &po
->sk
.sk_wmem_alloc
);
2205 while (likely(to_write
)) {
2206 nr_frags
= skb_shinfo(skb
)->nr_frags
;
2208 if (unlikely(nr_frags
>= MAX_SKB_FRAGS
)) {
2209 pr_err("Packet exceed the number of skb frags(%lu)\n",
2214 page
= pgv_to_page(data
);
2216 flush_dcache_page(page
);
2218 skb_fill_page_desc(skb
, nr_frags
, page
, offset
, len
);
2221 len_max
= PAGE_SIZE
;
2222 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2228 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
)
2230 struct sk_buff
*skb
;
2231 struct net_device
*dev
;
2233 int err
, reserve
= 0;
2235 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2236 bool need_wait
= !(msg
->msg_flags
& MSG_DONTWAIT
);
2237 int tp_len
, size_max
;
2238 unsigned char *addr
;
2240 int status
= TP_STATUS_AVAILABLE
;
2243 mutex_lock(&po
->pg_vec_lock
);
2245 if (likely(saddr
== NULL
)) {
2246 dev
= packet_cached_dev_get(po
);
2251 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2253 if (msg
->msg_namelen
< (saddr
->sll_halen
2254 + offsetof(struct sockaddr_ll
,
2257 proto
= saddr
->sll_protocol
;
2258 addr
= saddr
->sll_addr
;
2259 dev
= dev_get_by_index(sock_net(&po
->sk
), saddr
->sll_ifindex
);
2263 if (unlikely(dev
== NULL
))
2266 if (unlikely(!(dev
->flags
& IFF_UP
)))
2269 reserve
= dev
->hard_header_len
+ VLAN_HLEN
;
2270 size_max
= po
->tx_ring
.frame_size
2271 - (po
->tp_hdrlen
- sizeof(struct sockaddr_ll
));
2273 if (size_max
> dev
->mtu
+ reserve
)
2274 size_max
= dev
->mtu
+ reserve
;
2277 ph
= packet_current_frame(po
, &po
->tx_ring
,
2278 TP_STATUS_SEND_REQUEST
);
2279 if (unlikely(ph
== NULL
)) {
2280 if (need_wait
&& need_resched())
2285 status
= TP_STATUS_SEND_REQUEST
;
2286 hlen
= LL_RESERVED_SPACE(dev
);
2287 tlen
= dev
->needed_tailroom
;
2288 skb
= sock_alloc_send_skb(&po
->sk
,
2289 hlen
+ tlen
+ sizeof(struct sockaddr_ll
),
2292 if (unlikely(skb
== NULL
))
2295 tp_len
= tpacket_fill_skb(po
, skb
, ph
, dev
, size_max
, proto
,
2297 if (tp_len
> dev
->mtu
+ dev
->hard_header_len
) {
2298 struct ethhdr
*ehdr
;
2299 /* Earlier code assumed this would be a VLAN pkt,
2300 * double-check this now that we have the actual
2304 skb_reset_mac_header(skb
);
2305 ehdr
= eth_hdr(skb
);
2306 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
))
2309 if (unlikely(tp_len
< 0)) {
2311 __packet_set_status(po
, ph
,
2312 TP_STATUS_AVAILABLE
);
2313 packet_increment_head(&po
->tx_ring
);
2317 status
= TP_STATUS_WRONG_FORMAT
;
2323 packet_pick_tx_queue(dev
, skb
);
2325 skb
->destructor
= tpacket_destruct_skb
;
2326 __packet_set_status(po
, ph
, TP_STATUS_SENDING
);
2327 packet_inc_pending(&po
->tx_ring
);
2329 status
= TP_STATUS_SEND_REQUEST
;
2330 err
= po
->xmit(skb
);
2331 if (unlikely(err
> 0)) {
2332 err
= net_xmit_errno(err
);
2333 if (err
&& __packet_get_status(po
, ph
) ==
2334 TP_STATUS_AVAILABLE
) {
2335 /* skb was destructed already */
2340 * skb was dropped but not destructed yet;
2341 * let's treat it like congestion or err < 0
2345 packet_increment_head(&po
->tx_ring
);
2347 } while (likely((ph
!= NULL
) ||
2348 /* Note: packet_read_pending() might be slow if we have
2349 * to call it as it's per_cpu variable, but in fast-path
2350 * we already short-circuit the loop with the first
2351 * condition, and luckily don't have to go that path
2354 (need_wait
&& packet_read_pending(&po
->tx_ring
))));
2360 __packet_set_status(po
, ph
, status
);
2365 mutex_unlock(&po
->pg_vec_lock
);
2369 static struct sk_buff
*packet_alloc_skb(struct sock
*sk
, size_t prepad
,
2370 size_t reserve
, size_t len
,
2371 size_t linear
, int noblock
,
2374 struct sk_buff
*skb
;
2376 /* Under a page? Don't bother with paged skb. */
2377 if (prepad
+ len
< PAGE_SIZE
|| !linear
)
2380 skb
= sock_alloc_send_pskb(sk
, prepad
+ linear
, len
- linear
, noblock
,
2385 skb_reserve(skb
, reserve
);
2386 skb_put(skb
, linear
);
2387 skb
->data_len
= len
- linear
;
2388 skb
->len
+= len
- linear
;
2393 static int packet_snd(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
2395 struct sock
*sk
= sock
->sk
;
2396 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2397 struct sk_buff
*skb
;
2398 struct net_device
*dev
;
2400 unsigned char *addr
;
2401 int err
, reserve
= 0;
2402 struct virtio_net_hdr vnet_hdr
= { 0 };
2405 struct packet_sock
*po
= pkt_sk(sk
);
2406 unsigned short gso_type
= 0;
2411 * Get and verify the address.
2414 if (likely(saddr
== NULL
)) {
2415 dev
= packet_cached_dev_get(po
);
2420 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2422 if (msg
->msg_namelen
< (saddr
->sll_halen
+ offsetof(struct sockaddr_ll
, sll_addr
)))
2424 proto
= saddr
->sll_protocol
;
2425 addr
= saddr
->sll_addr
;
2426 dev
= dev_get_by_index(sock_net(sk
), saddr
->sll_ifindex
);
2430 if (unlikely(dev
== NULL
))
2433 if (unlikely(!(dev
->flags
& IFF_UP
)))
2436 if (sock
->type
== SOCK_RAW
)
2437 reserve
= dev
->hard_header_len
;
2438 if (po
->has_vnet_hdr
) {
2439 vnet_hdr_len
= sizeof(vnet_hdr
);
2442 if (len
< vnet_hdr_len
)
2445 len
-= vnet_hdr_len
;
2447 err
= memcpy_fromiovec((void *)&vnet_hdr
, msg
->msg_iov
,
2452 if ((vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) &&
2453 (vnet_hdr
.csum_start
+ vnet_hdr
.csum_offset
+ 2 >
2455 vnet_hdr
.hdr_len
= vnet_hdr
.csum_start
+
2456 vnet_hdr
.csum_offset
+ 2;
2459 if (vnet_hdr
.hdr_len
> len
)
2462 if (vnet_hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
2463 switch (vnet_hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
2464 case VIRTIO_NET_HDR_GSO_TCPV4
:
2465 gso_type
= SKB_GSO_TCPV4
;
2467 case VIRTIO_NET_HDR_GSO_TCPV6
:
2468 gso_type
= SKB_GSO_TCPV6
;
2470 case VIRTIO_NET_HDR_GSO_UDP
:
2471 gso_type
= SKB_GSO_UDP
;
2477 if (vnet_hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
2478 gso_type
|= SKB_GSO_TCP_ECN
;
2480 if (vnet_hdr
.gso_size
== 0)
2486 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
2487 if (!netif_supports_nofcs(dev
)) {
2488 err
= -EPROTONOSUPPORT
;
2491 extra_len
= 4; /* We're doing our own CRC */
2495 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ VLAN_HLEN
+ extra_len
))
2499 hlen
= LL_RESERVED_SPACE(dev
);
2500 tlen
= dev
->needed_tailroom
;
2501 skb
= packet_alloc_skb(sk
, hlen
+ tlen
, hlen
, len
, vnet_hdr
.hdr_len
,
2502 msg
->msg_flags
& MSG_DONTWAIT
, &err
);
2506 skb_set_network_header(skb
, reserve
);
2509 if (sock
->type
== SOCK_DGRAM
&&
2510 (offset
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
, NULL
, len
)) < 0)
2513 /* Returns -EFAULT on error */
2514 err
= skb_copy_datagram_from_iovec(skb
, offset
, msg
->msg_iov
, 0, len
);
2518 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
2520 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ extra_len
)) {
2521 /* Earlier code assumed this would be a VLAN pkt,
2522 * double-check this now that we have the actual
2525 struct ethhdr
*ehdr
;
2526 skb_reset_mac_header(skb
);
2527 ehdr
= eth_hdr(skb
);
2528 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
2534 skb
->protocol
= proto
;
2536 skb
->priority
= sk
->sk_priority
;
2537 skb
->mark
= sk
->sk_mark
;
2539 packet_pick_tx_queue(dev
, skb
);
2541 if (po
->has_vnet_hdr
) {
2542 if (vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
2543 if (!skb_partial_csum_set(skb
, vnet_hdr
.csum_start
,
2544 vnet_hdr
.csum_offset
)) {
2550 skb_shinfo(skb
)->gso_size
= vnet_hdr
.gso_size
;
2551 skb_shinfo(skb
)->gso_type
= gso_type
;
2553 /* Header must be checked, and gso_segs computed. */
2554 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
2555 skb_shinfo(skb
)->gso_segs
= 0;
2557 len
+= vnet_hdr_len
;
2560 if (!packet_use_direct_xmit(po
))
2561 skb_probe_transport_header(skb
, reserve
);
2562 if (unlikely(extra_len
== 4))
2565 err
= po
->xmit(skb
);
2566 if (err
> 0 && (err
= net_xmit_errno(err
)) != 0)
2582 static int packet_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
2583 struct msghdr
*msg
, size_t len
)
2585 struct sock
*sk
= sock
->sk
;
2586 struct packet_sock
*po
= pkt_sk(sk
);
2588 if (po
->tx_ring
.pg_vec
)
2589 return tpacket_snd(po
, msg
);
2591 return packet_snd(sock
, msg
, len
);
2595 * Close a PACKET socket. This is fairly simple. We immediately go
2596 * to 'closed' state and remove our protocol entry in the device list.
2599 static int packet_release(struct socket
*sock
)
2601 struct sock
*sk
= sock
->sk
;
2602 struct packet_sock
*po
;
2604 union tpacket_req_u req_u
;
2612 mutex_lock(&net
->packet
.sklist_lock
);
2613 sk_del_node_init_rcu(sk
);
2614 mutex_unlock(&net
->packet
.sklist_lock
);
2617 sock_prot_inuse_add(net
, sk
->sk_prot
, -1);
2620 spin_lock(&po
->bind_lock
);
2621 unregister_prot_hook(sk
, false);
2622 packet_cached_dev_reset(po
);
2624 if (po
->prot_hook
.dev
) {
2625 dev_put(po
->prot_hook
.dev
);
2626 po
->prot_hook
.dev
= NULL
;
2628 spin_unlock(&po
->bind_lock
);
2630 packet_flush_mclist(sk
);
2632 if (po
->rx_ring
.pg_vec
) {
2633 memset(&req_u
, 0, sizeof(req_u
));
2634 packet_set_ring(sk
, &req_u
, 1, 0);
2637 if (po
->tx_ring
.pg_vec
) {
2638 memset(&req_u
, 0, sizeof(req_u
));
2639 packet_set_ring(sk
, &req_u
, 1, 1);
2646 * Now the socket is dead. No more input will appear.
2653 skb_queue_purge(&sk
->sk_receive_queue
);
2654 packet_free_pending(po
);
2655 sk_refcnt_debug_release(sk
);
2662 * Attach a packet hook.
2665 static int packet_do_bind(struct sock
*sk
, struct net_device
*dev
, __be16 proto
)
2667 struct packet_sock
*po
= pkt_sk(sk
);
2668 const struct net_device
*dev_curr
;
2680 spin_lock(&po
->bind_lock
);
2682 proto_curr
= po
->prot_hook
.type
;
2683 dev_curr
= po
->prot_hook
.dev
;
2685 need_rehook
= proto_curr
!= proto
|| dev_curr
!= dev
;
2688 unregister_prot_hook(sk
, true);
2691 po
->prot_hook
.type
= proto
;
2693 if (po
->prot_hook
.dev
)
2694 dev_put(po
->prot_hook
.dev
);
2696 po
->prot_hook
.dev
= dev
;
2698 po
->ifindex
= dev
? dev
->ifindex
: 0;
2699 packet_cached_dev_assign(po
, dev
);
2702 if (proto
== 0 || !need_rehook
)
2705 if (!dev
|| (dev
->flags
& IFF_UP
)) {
2706 register_prot_hook(sk
);
2708 sk
->sk_err
= ENETDOWN
;
2709 if (!sock_flag(sk
, SOCK_DEAD
))
2710 sk
->sk_error_report(sk
);
2714 spin_unlock(&po
->bind_lock
);
2720 * Bind a packet socket to a device
2723 static int packet_bind_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
2726 struct sock
*sk
= sock
->sk
;
2728 struct net_device
*dev
;
2735 if (addr_len
!= sizeof(struct sockaddr
))
2737 strlcpy(name
, uaddr
->sa_data
, sizeof(name
));
2739 dev
= dev_get_by_name(sock_net(sk
), name
);
2741 err
= packet_do_bind(sk
, dev
, pkt_sk(sk
)->num
);
2745 static int packet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
2747 struct sockaddr_ll
*sll
= (struct sockaddr_ll
*)uaddr
;
2748 struct sock
*sk
= sock
->sk
;
2749 struct net_device
*dev
= NULL
;
2757 if (addr_len
< sizeof(struct sockaddr_ll
))
2759 if (sll
->sll_family
!= AF_PACKET
)
2762 if (sll
->sll_ifindex
) {
2764 dev
= dev_get_by_index(sock_net(sk
), sll
->sll_ifindex
);
2768 err
= packet_do_bind(sk
, dev
, sll
->sll_protocol
? : pkt_sk(sk
)->num
);
2774 static struct proto packet_proto
= {
2776 .owner
= THIS_MODULE
,
2777 .obj_size
= sizeof(struct packet_sock
),
2781 * Create a packet of type SOCK_PACKET.
2784 static int packet_create(struct net
*net
, struct socket
*sock
, int protocol
,
2788 struct packet_sock
*po
;
2789 __be16 proto
= (__force __be16
)protocol
; /* weird, but documented */
2792 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
))
2794 if (sock
->type
!= SOCK_DGRAM
&& sock
->type
!= SOCK_RAW
&&
2795 sock
->type
!= SOCK_PACKET
)
2796 return -ESOCKTNOSUPPORT
;
2798 sock
->state
= SS_UNCONNECTED
;
2801 sk
= sk_alloc(net
, PF_PACKET
, GFP_KERNEL
, &packet_proto
);
2805 sock
->ops
= &packet_ops
;
2806 if (sock
->type
== SOCK_PACKET
)
2807 sock
->ops
= &packet_ops_spkt
;
2809 sock_init_data(sock
, sk
);
2812 sk
->sk_family
= PF_PACKET
;
2814 po
->xmit
= dev_queue_xmit
;
2816 err
= packet_alloc_pending(po
);
2820 packet_cached_dev_reset(po
);
2822 sk
->sk_destruct
= packet_sock_destruct
;
2823 sk_refcnt_debug_inc(sk
);
2826 * Attach a protocol block
2829 spin_lock_init(&po
->bind_lock
);
2830 mutex_init(&po
->pg_vec_lock
);
2831 po
->prot_hook
.func
= packet_rcv
;
2833 if (sock
->type
== SOCK_PACKET
)
2834 po
->prot_hook
.func
= packet_rcv_spkt
;
2836 po
->prot_hook
.af_packet_priv
= sk
;
2839 po
->prot_hook
.type
= proto
;
2840 register_prot_hook(sk
);
2843 mutex_lock(&net
->packet
.sklist_lock
);
2844 sk_add_node_rcu(sk
, &net
->packet
.sklist
);
2845 mutex_unlock(&net
->packet
.sklist_lock
);
2848 sock_prot_inuse_add(net
, &packet_proto
, 1);
2859 * Pull a packet from our receive queue and hand it to the user.
2860 * If necessary we block.
2863 static int packet_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
2864 struct msghdr
*msg
, size_t len
, int flags
)
2866 struct sock
*sk
= sock
->sk
;
2867 struct sk_buff
*skb
;
2869 int vnet_hdr_len
= 0;
2872 if (flags
& ~(MSG_PEEK
|MSG_DONTWAIT
|MSG_TRUNC
|MSG_CMSG_COMPAT
|MSG_ERRQUEUE
))
2876 /* What error should we return now? EUNATTACH? */
2877 if (pkt_sk(sk
)->ifindex
< 0)
2881 if (flags
& MSG_ERRQUEUE
) {
2882 err
= sock_recv_errqueue(sk
, msg
, len
,
2883 SOL_PACKET
, PACKET_TX_TIMESTAMP
);
2888 * Call the generic datagram receiver. This handles all sorts
2889 * of horrible races and re-entrancy so we can forget about it
2890 * in the protocol layers.
2892 * Now it will return ENETDOWN, if device have just gone down,
2893 * but then it will block.
2896 skb
= skb_recv_datagram(sk
, flags
, flags
& MSG_DONTWAIT
, &err
);
2899 * An error occurred so return it. Because skb_recv_datagram()
2900 * handles the blocking we don't see and worry about blocking
2907 if (pkt_sk(sk
)->has_vnet_hdr
) {
2908 struct virtio_net_hdr vnet_hdr
= { 0 };
2911 vnet_hdr_len
= sizeof(vnet_hdr
);
2912 if (len
< vnet_hdr_len
)
2915 len
-= vnet_hdr_len
;
2917 if (skb_is_gso(skb
)) {
2918 struct skb_shared_info
*sinfo
= skb_shinfo(skb
);
2920 /* This is a hint as to how much should be linear. */
2921 vnet_hdr
.hdr_len
= skb_headlen(skb
);
2922 vnet_hdr
.gso_size
= sinfo
->gso_size
;
2923 if (sinfo
->gso_type
& SKB_GSO_TCPV4
)
2924 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
2925 else if (sinfo
->gso_type
& SKB_GSO_TCPV6
)
2926 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
2927 else if (sinfo
->gso_type
& SKB_GSO_UDP
)
2928 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
2929 else if (sinfo
->gso_type
& SKB_GSO_FCOE
)
2933 if (sinfo
->gso_type
& SKB_GSO_TCP_ECN
)
2934 vnet_hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
2936 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
2938 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2939 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
2940 vnet_hdr
.csum_start
= skb_checksum_start_offset(skb
);
2941 vnet_hdr
.csum_offset
= skb
->csum_offset
;
2942 } else if (skb
->ip_summed
== CHECKSUM_UNNECESSARY
) {
2943 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_DATA_VALID
;
2944 } /* else everything is zero */
2946 err
= memcpy_toiovec(msg
->msg_iov
, (void *)&vnet_hdr
,
2952 /* You lose any data beyond the buffer you gave. If it worries
2953 * a user program they can ask the device for its MTU
2959 msg
->msg_flags
|= MSG_TRUNC
;
2962 err
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
2966 sock_recv_ts_and_drops(msg
, sk
, skb
);
2968 if (msg
->msg_name
) {
2969 /* If the address length field is there to be filled
2970 * in, we fill it in now.
2972 if (sock
->type
== SOCK_PACKET
) {
2973 __sockaddr_check_size(sizeof(struct sockaddr_pkt
));
2974 msg
->msg_namelen
= sizeof(struct sockaddr_pkt
);
2976 struct sockaddr_ll
*sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
2977 msg
->msg_namelen
= sll
->sll_halen
+
2978 offsetof(struct sockaddr_ll
, sll_addr
);
2980 memcpy(msg
->msg_name
, &PACKET_SKB_CB(skb
)->sa
,
2984 if (pkt_sk(sk
)->auxdata
) {
2985 struct tpacket_auxdata aux
;
2987 aux
.tp_status
= TP_STATUS_USER
;
2988 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
2989 aux
.tp_status
|= TP_STATUS_CSUMNOTREADY
;
2990 aux
.tp_len
= PACKET_SKB_CB(skb
)->origlen
;
2991 aux
.tp_snaplen
= skb
->len
;
2993 aux
.tp_net
= skb_network_offset(skb
);
2994 if (vlan_tx_tag_present(skb
)) {
2995 aux
.tp_vlan_tci
= vlan_tx_tag_get(skb
);
2996 aux
.tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
2997 aux
.tp_status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
2999 aux
.tp_vlan_tci
= 0;
3000 aux
.tp_vlan_tpid
= 0;
3002 put_cmsg(msg
, SOL_PACKET
, PACKET_AUXDATA
, sizeof(aux
), &aux
);
3006 * Free or return the buffer as appropriate. Again this
3007 * hides all the races and re-entrancy issues from us.
3009 err
= vnet_hdr_len
+ ((flags
&MSG_TRUNC
) ? skb
->len
: copied
);
3012 skb_free_datagram(sk
, skb
);
3017 static int packet_getname_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
3018 int *uaddr_len
, int peer
)
3020 struct net_device
*dev
;
3021 struct sock
*sk
= sock
->sk
;
3026 uaddr
->sa_family
= AF_PACKET
;
3027 memset(uaddr
->sa_data
, 0, sizeof(uaddr
->sa_data
));
3029 dev
= dev_get_by_index_rcu(sock_net(sk
), pkt_sk(sk
)->ifindex
);
3031 strlcpy(uaddr
->sa_data
, dev
->name
, sizeof(uaddr
->sa_data
));
3033 *uaddr_len
= sizeof(*uaddr
);
3038 static int packet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
3039 int *uaddr_len
, int peer
)
3041 struct net_device
*dev
;
3042 struct sock
*sk
= sock
->sk
;
3043 struct packet_sock
*po
= pkt_sk(sk
);
3044 DECLARE_SOCKADDR(struct sockaddr_ll
*, sll
, uaddr
);
3049 sll
->sll_family
= AF_PACKET
;
3050 sll
->sll_ifindex
= po
->ifindex
;
3051 sll
->sll_protocol
= po
->num
;
3052 sll
->sll_pkttype
= 0;
3054 dev
= dev_get_by_index_rcu(sock_net(sk
), po
->ifindex
);
3056 sll
->sll_hatype
= dev
->type
;
3057 sll
->sll_halen
= dev
->addr_len
;
3058 memcpy(sll
->sll_addr
, dev
->dev_addr
, dev
->addr_len
);
3060 sll
->sll_hatype
= 0; /* Bad: we have no ARPHRD_UNSPEC */
3064 *uaddr_len
= offsetof(struct sockaddr_ll
, sll_addr
) + sll
->sll_halen
;
3069 static int packet_dev_mc(struct net_device
*dev
, struct packet_mclist
*i
,
3073 case PACKET_MR_MULTICAST
:
3074 if (i
->alen
!= dev
->addr_len
)
3077 return dev_mc_add(dev
, i
->addr
);
3079 return dev_mc_del(dev
, i
->addr
);
3081 case PACKET_MR_PROMISC
:
3082 return dev_set_promiscuity(dev
, what
);
3083 case PACKET_MR_ALLMULTI
:
3084 return dev_set_allmulti(dev
, what
);
3085 case PACKET_MR_UNICAST
:
3086 if (i
->alen
!= dev
->addr_len
)
3089 return dev_uc_add(dev
, i
->addr
);
3091 return dev_uc_del(dev
, i
->addr
);
3099 static void packet_dev_mclist(struct net_device
*dev
, struct packet_mclist
*i
, int what
)
3101 for ( ; i
; i
= i
->next
) {
3102 if (i
->ifindex
== dev
->ifindex
)
3103 packet_dev_mc(dev
, i
, what
);
3107 static int packet_mc_add(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3109 struct packet_sock
*po
= pkt_sk(sk
);
3110 struct packet_mclist
*ml
, *i
;
3111 struct net_device
*dev
;
3117 dev
= __dev_get_by_index(sock_net(sk
), mreq
->mr_ifindex
);
3122 if (mreq
->mr_alen
> dev
->addr_len
)
3126 i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
3131 for (ml
= po
->mclist
; ml
; ml
= ml
->next
) {
3132 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3133 ml
->type
== mreq
->mr_type
&&
3134 ml
->alen
== mreq
->mr_alen
&&
3135 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3137 /* Free the new element ... */
3143 i
->type
= mreq
->mr_type
;
3144 i
->ifindex
= mreq
->mr_ifindex
;
3145 i
->alen
= mreq
->mr_alen
;
3146 memcpy(i
->addr
, mreq
->mr_address
, i
->alen
);
3148 i
->next
= po
->mclist
;
3150 err
= packet_dev_mc(dev
, i
, 1);
3152 po
->mclist
= i
->next
;
3161 static int packet_mc_drop(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3163 struct packet_mclist
*ml
, **mlp
;
3167 for (mlp
= &pkt_sk(sk
)->mclist
; (ml
= *mlp
) != NULL
; mlp
= &ml
->next
) {
3168 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3169 ml
->type
== mreq
->mr_type
&&
3170 ml
->alen
== mreq
->mr_alen
&&
3171 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3172 if (--ml
->count
== 0) {
3173 struct net_device
*dev
;
3175 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3177 packet_dev_mc(dev
, ml
, -1);
3185 return -EADDRNOTAVAIL
;
3188 static void packet_flush_mclist(struct sock
*sk
)
3190 struct packet_sock
*po
= pkt_sk(sk
);
3191 struct packet_mclist
*ml
;
3197 while ((ml
= po
->mclist
) != NULL
) {
3198 struct net_device
*dev
;
3200 po
->mclist
= ml
->next
;
3201 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3203 packet_dev_mc(dev
, ml
, -1);
3210 packet_setsockopt(struct socket
*sock
, int level
, int optname
, char __user
*optval
, unsigned int optlen
)
3212 struct sock
*sk
= sock
->sk
;
3213 struct packet_sock
*po
= pkt_sk(sk
);
3216 if (level
!= SOL_PACKET
)
3217 return -ENOPROTOOPT
;
3220 case PACKET_ADD_MEMBERSHIP
:
3221 case PACKET_DROP_MEMBERSHIP
:
3223 struct packet_mreq_max mreq
;
3225 memset(&mreq
, 0, sizeof(mreq
));
3226 if (len
< sizeof(struct packet_mreq
))
3228 if (len
> sizeof(mreq
))
3230 if (copy_from_user(&mreq
, optval
, len
))
3232 if (len
< (mreq
.mr_alen
+ offsetof(struct packet_mreq
, mr_address
)))
3234 if (optname
== PACKET_ADD_MEMBERSHIP
)
3235 ret
= packet_mc_add(sk
, &mreq
);
3237 ret
= packet_mc_drop(sk
, &mreq
);
3241 case PACKET_RX_RING
:
3242 case PACKET_TX_RING
:
3244 union tpacket_req_u req_u
;
3247 switch (po
->tp_version
) {
3250 len
= sizeof(req_u
.req
);
3254 len
= sizeof(req_u
.req3
);
3259 if (pkt_sk(sk
)->has_vnet_hdr
)
3261 if (copy_from_user(&req_u
.req
, optval
, len
))
3263 return packet_set_ring(sk
, &req_u
, 0,
3264 optname
== PACKET_TX_RING
);
3266 case PACKET_COPY_THRESH
:
3270 if (optlen
!= sizeof(val
))
3272 if (copy_from_user(&val
, optval
, sizeof(val
)))
3275 pkt_sk(sk
)->copy_thresh
= val
;
3278 case PACKET_VERSION
:
3282 if (optlen
!= sizeof(val
))
3284 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3286 if (copy_from_user(&val
, optval
, sizeof(val
)))
3292 po
->tp_version
= val
;
3298 case PACKET_RESERVE
:
3302 if (optlen
!= sizeof(val
))
3304 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3306 if (copy_from_user(&val
, optval
, sizeof(val
)))
3308 po
->tp_reserve
= val
;
3315 if (optlen
!= sizeof(val
))
3317 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3319 if (copy_from_user(&val
, optval
, sizeof(val
)))
3321 po
->tp_loss
= !!val
;
3324 case PACKET_AUXDATA
:
3328 if (optlen
< sizeof(val
))
3330 if (copy_from_user(&val
, optval
, sizeof(val
)))
3333 po
->auxdata
= !!val
;
3336 case PACKET_ORIGDEV
:
3340 if (optlen
< sizeof(val
))
3342 if (copy_from_user(&val
, optval
, sizeof(val
)))
3345 po
->origdev
= !!val
;
3348 case PACKET_VNET_HDR
:
3352 if (sock
->type
!= SOCK_RAW
)
3354 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3356 if (optlen
< sizeof(val
))
3358 if (copy_from_user(&val
, optval
, sizeof(val
)))
3361 po
->has_vnet_hdr
= !!val
;
3364 case PACKET_TIMESTAMP
:
3368 if (optlen
!= sizeof(val
))
3370 if (copy_from_user(&val
, optval
, sizeof(val
)))
3373 po
->tp_tstamp
= val
;
3380 if (optlen
!= sizeof(val
))
3382 if (copy_from_user(&val
, optval
, sizeof(val
)))
3385 return fanout_add(sk
, val
& 0xffff, val
>> 16);
3387 case PACKET_TX_HAS_OFF
:
3391 if (optlen
!= sizeof(val
))
3393 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3395 if (copy_from_user(&val
, optval
, sizeof(val
)))
3397 po
->tp_tx_has_off
= !!val
;
3400 case PACKET_QDISC_BYPASS
:
3404 if (optlen
!= sizeof(val
))
3406 if (copy_from_user(&val
, optval
, sizeof(val
)))
3409 po
->xmit
= val
? packet_direct_xmit
: dev_queue_xmit
;
3413 return -ENOPROTOOPT
;
3417 static int packet_getsockopt(struct socket
*sock
, int level
, int optname
,
3418 char __user
*optval
, int __user
*optlen
)
3421 int val
, lv
= sizeof(val
);
3422 struct sock
*sk
= sock
->sk
;
3423 struct packet_sock
*po
= pkt_sk(sk
);
3425 union tpacket_stats_u st
;
3427 if (level
!= SOL_PACKET
)
3428 return -ENOPROTOOPT
;
3430 if (get_user(len
, optlen
))
3437 case PACKET_STATISTICS
:
3438 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3439 memcpy(&st
, &po
->stats
, sizeof(st
));
3440 memset(&po
->stats
, 0, sizeof(po
->stats
));
3441 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3443 if (po
->tp_version
== TPACKET_V3
) {
3444 lv
= sizeof(struct tpacket_stats_v3
);
3445 st
.stats3
.tp_packets
+= st
.stats3
.tp_drops
;
3448 lv
= sizeof(struct tpacket_stats
);
3449 st
.stats1
.tp_packets
+= st
.stats1
.tp_drops
;
3454 case PACKET_AUXDATA
:
3457 case PACKET_ORIGDEV
:
3460 case PACKET_VNET_HDR
:
3461 val
= po
->has_vnet_hdr
;
3463 case PACKET_VERSION
:
3464 val
= po
->tp_version
;
3467 if (len
> sizeof(int))
3469 if (copy_from_user(&val
, optval
, len
))
3473 val
= sizeof(struct tpacket_hdr
);
3476 val
= sizeof(struct tpacket2_hdr
);
3479 val
= sizeof(struct tpacket3_hdr
);
3485 case PACKET_RESERVE
:
3486 val
= po
->tp_reserve
;
3491 case PACKET_TIMESTAMP
:
3492 val
= po
->tp_tstamp
;
3496 ((u32
)po
->fanout
->id
|
3497 ((u32
)po
->fanout
->type
<< 16) |
3498 ((u32
)po
->fanout
->flags
<< 24)) :
3501 case PACKET_TX_HAS_OFF
:
3502 val
= po
->tp_tx_has_off
;
3504 case PACKET_QDISC_BYPASS
:
3505 val
= packet_use_direct_xmit(po
);
3508 return -ENOPROTOOPT
;
3513 if (put_user(len
, optlen
))
3515 if (copy_to_user(optval
, data
, len
))
3521 static int packet_notifier(struct notifier_block
*this,
3522 unsigned long msg
, void *ptr
)
3525 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
3526 struct net
*net
= dev_net(dev
);
3529 sk_for_each_rcu(sk
, &net
->packet
.sklist
) {
3530 struct packet_sock
*po
= pkt_sk(sk
);
3533 case NETDEV_UNREGISTER
:
3535 packet_dev_mclist(dev
, po
->mclist
, -1);
3539 if (dev
->ifindex
== po
->ifindex
) {
3540 spin_lock(&po
->bind_lock
);
3542 __unregister_prot_hook(sk
, false);
3543 sk
->sk_err
= ENETDOWN
;
3544 if (!sock_flag(sk
, SOCK_DEAD
))
3545 sk
->sk_error_report(sk
);
3547 if (msg
== NETDEV_UNREGISTER
) {
3548 packet_cached_dev_reset(po
);
3550 if (po
->prot_hook
.dev
)
3551 dev_put(po
->prot_hook
.dev
);
3552 po
->prot_hook
.dev
= NULL
;
3554 spin_unlock(&po
->bind_lock
);
3558 if (dev
->ifindex
== po
->ifindex
) {
3559 spin_lock(&po
->bind_lock
);
3561 register_prot_hook(sk
);
3562 spin_unlock(&po
->bind_lock
);
3572 static int packet_ioctl(struct socket
*sock
, unsigned int cmd
,
3575 struct sock
*sk
= sock
->sk
;
3580 int amount
= sk_wmem_alloc_get(sk
);
3582 return put_user(amount
, (int __user
*)arg
);
3586 struct sk_buff
*skb
;
3589 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3590 skb
= skb_peek(&sk
->sk_receive_queue
);
3593 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3594 return put_user(amount
, (int __user
*)arg
);
3597 return sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
3599 return sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
3609 case SIOCGIFBRDADDR
:
3610 case SIOCSIFBRDADDR
:
3611 case SIOCGIFNETMASK
:
3612 case SIOCSIFNETMASK
:
3613 case SIOCGIFDSTADDR
:
3614 case SIOCSIFDSTADDR
:
3616 return inet_dgram_ops
.ioctl(sock
, cmd
, arg
);
3620 return -ENOIOCTLCMD
;
3625 static unsigned int packet_poll(struct file
*file
, struct socket
*sock
,
3628 struct sock
*sk
= sock
->sk
;
3629 struct packet_sock
*po
= pkt_sk(sk
);
3630 unsigned int mask
= datagram_poll(file
, sock
, wait
);
3632 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3633 if (po
->rx_ring
.pg_vec
) {
3634 if (!packet_previous_rx_frame(po
, &po
->rx_ring
,
3636 mask
|= POLLIN
| POLLRDNORM
;
3638 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3639 spin_lock_bh(&sk
->sk_write_queue
.lock
);
3640 if (po
->tx_ring
.pg_vec
) {
3641 if (packet_current_frame(po
, &po
->tx_ring
, TP_STATUS_AVAILABLE
))
3642 mask
|= POLLOUT
| POLLWRNORM
;
3644 spin_unlock_bh(&sk
->sk_write_queue
.lock
);
3649 /* Dirty? Well, I still did not learn better way to account
3653 static void packet_mm_open(struct vm_area_struct
*vma
)
3655 struct file
*file
= vma
->vm_file
;
3656 struct socket
*sock
= file
->private_data
;
3657 struct sock
*sk
= sock
->sk
;
3660 atomic_inc(&pkt_sk(sk
)->mapped
);
3663 static void packet_mm_close(struct vm_area_struct
*vma
)
3665 struct file
*file
= vma
->vm_file
;
3666 struct socket
*sock
= file
->private_data
;
3667 struct sock
*sk
= sock
->sk
;
3670 atomic_dec(&pkt_sk(sk
)->mapped
);
3673 static const struct vm_operations_struct packet_mmap_ops
= {
3674 .open
= packet_mm_open
,
3675 .close
= packet_mm_close
,
3678 static void free_pg_vec(struct pgv
*pg_vec
, unsigned int order
,
3683 for (i
= 0; i
< len
; i
++) {
3684 if (likely(pg_vec
[i
].buffer
)) {
3685 if (is_vmalloc_addr(pg_vec
[i
].buffer
))
3686 vfree(pg_vec
[i
].buffer
);
3688 free_pages((unsigned long)pg_vec
[i
].buffer
,
3690 pg_vec
[i
].buffer
= NULL
;
3696 static char *alloc_one_pg_vec_page(unsigned long order
)
3699 gfp_t gfp_flags
= GFP_KERNEL
| __GFP_COMP
|
3700 __GFP_ZERO
| __GFP_NOWARN
| __GFP_NORETRY
;
3702 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
3706 /* __get_free_pages failed, fall back to vmalloc */
3707 buffer
= vzalloc((1 << order
) * PAGE_SIZE
);
3711 /* vmalloc failed, lets dig into swap here */
3712 gfp_flags
&= ~__GFP_NORETRY
;
3713 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
3717 /* complete and utter failure */
3721 static struct pgv
*alloc_pg_vec(struct tpacket_req
*req
, int order
)
3723 unsigned int block_nr
= req
->tp_block_nr
;
3727 pg_vec
= kcalloc(block_nr
, sizeof(struct pgv
), GFP_KERNEL
);
3728 if (unlikely(!pg_vec
))
3731 for (i
= 0; i
< block_nr
; i
++) {
3732 pg_vec
[i
].buffer
= alloc_one_pg_vec_page(order
);
3733 if (unlikely(!pg_vec
[i
].buffer
))
3734 goto out_free_pgvec
;
3741 free_pg_vec(pg_vec
, order
, block_nr
);
3746 static int packet_set_ring(struct sock
*sk
, union tpacket_req_u
*req_u
,
3747 int closing
, int tx_ring
)
3749 struct pgv
*pg_vec
= NULL
;
3750 struct packet_sock
*po
= pkt_sk(sk
);
3751 int was_running
, order
= 0;
3752 struct packet_ring_buffer
*rb
;
3753 struct sk_buff_head
*rb_queue
;
3756 /* Added to avoid minimal code churn */
3757 struct tpacket_req
*req
= &req_u
->req
;
3759 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
3760 if (!closing
&& tx_ring
&& (po
->tp_version
> TPACKET_V2
)) {
3761 WARN(1, "Tx-ring is not supported.\n");
3765 rb
= tx_ring
? &po
->tx_ring
: &po
->rx_ring
;
3766 rb_queue
= tx_ring
? &sk
->sk_write_queue
: &sk
->sk_receive_queue
;
3770 if (atomic_read(&po
->mapped
))
3772 if (packet_read_pending(rb
))
3776 if (req
->tp_block_nr
) {
3777 /* Sanity tests and some calculations */
3779 if (unlikely(rb
->pg_vec
))
3782 switch (po
->tp_version
) {
3784 po
->tp_hdrlen
= TPACKET_HDRLEN
;
3787 po
->tp_hdrlen
= TPACKET2_HDRLEN
;
3790 po
->tp_hdrlen
= TPACKET3_HDRLEN
;
3795 if (unlikely((int)req
->tp_block_size
<= 0))
3797 if (unlikely(req
->tp_block_size
& (PAGE_SIZE
- 1)))
3799 if (po
->tp_version
>= TPACKET_V3
&&
3800 (int)(req
->tp_block_size
-
3801 BLK_PLUS_PRIV(req_u
->req3
.tp_sizeof_priv
)) <= 0)
3803 if (unlikely(req
->tp_frame_size
< po
->tp_hdrlen
+
3806 if (unlikely(req
->tp_frame_size
& (TPACKET_ALIGNMENT
- 1)))
3809 rb
->frames_per_block
= req
->tp_block_size
/req
->tp_frame_size
;
3810 if (unlikely(rb
->frames_per_block
<= 0))
3812 if (unlikely((rb
->frames_per_block
* req
->tp_block_nr
) !=
3817 order
= get_order(req
->tp_block_size
);
3818 pg_vec
= alloc_pg_vec(req
, order
);
3819 if (unlikely(!pg_vec
))
3821 switch (po
->tp_version
) {
3823 /* Transmit path is not supported. We checked
3824 * it above but just being paranoid
3827 init_prb_bdqc(po
, rb
, pg_vec
, req_u
, tx_ring
);
3836 if (unlikely(req
->tp_frame_nr
))
3842 /* Detach socket from network */
3843 spin_lock(&po
->bind_lock
);
3844 was_running
= po
->running
;
3848 __unregister_prot_hook(sk
, false);
3850 spin_unlock(&po
->bind_lock
);
3855 mutex_lock(&po
->pg_vec_lock
);
3856 if (closing
|| atomic_read(&po
->mapped
) == 0) {
3858 spin_lock_bh(&rb_queue
->lock
);
3859 swap(rb
->pg_vec
, pg_vec
);
3860 rb
->frame_max
= (req
->tp_frame_nr
- 1);
3862 rb
->frame_size
= req
->tp_frame_size
;
3863 spin_unlock_bh(&rb_queue
->lock
);
3865 swap(rb
->pg_vec_order
, order
);
3866 swap(rb
->pg_vec_len
, req
->tp_block_nr
);
3868 rb
->pg_vec_pages
= req
->tp_block_size
/PAGE_SIZE
;
3869 po
->prot_hook
.func
= (po
->rx_ring
.pg_vec
) ?
3870 tpacket_rcv
: packet_rcv
;
3871 skb_queue_purge(rb_queue
);
3872 if (atomic_read(&po
->mapped
))
3873 pr_err("packet_mmap: vma is busy: %d\n",
3874 atomic_read(&po
->mapped
));
3876 mutex_unlock(&po
->pg_vec_lock
);
3878 spin_lock(&po
->bind_lock
);
3881 register_prot_hook(sk
);
3883 spin_unlock(&po
->bind_lock
);
3884 if (closing
&& (po
->tp_version
> TPACKET_V2
)) {
3885 /* Because we don't support block-based V3 on tx-ring */
3887 prb_shutdown_retire_blk_timer(po
, tx_ring
, rb_queue
);
3892 free_pg_vec(pg_vec
, order
, req
->tp_block_nr
);
3897 static int packet_mmap(struct file
*file
, struct socket
*sock
,
3898 struct vm_area_struct
*vma
)
3900 struct sock
*sk
= sock
->sk
;
3901 struct packet_sock
*po
= pkt_sk(sk
);
3902 unsigned long size
, expected_size
;
3903 struct packet_ring_buffer
*rb
;
3904 unsigned long start
;
3911 mutex_lock(&po
->pg_vec_lock
);
3914 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
3916 expected_size
+= rb
->pg_vec_len
3922 if (expected_size
== 0)
3925 size
= vma
->vm_end
- vma
->vm_start
;
3926 if (size
!= expected_size
)
3929 start
= vma
->vm_start
;
3930 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
3931 if (rb
->pg_vec
== NULL
)
3934 for (i
= 0; i
< rb
->pg_vec_len
; i
++) {
3936 void *kaddr
= rb
->pg_vec
[i
].buffer
;
3939 for (pg_num
= 0; pg_num
< rb
->pg_vec_pages
; pg_num
++) {
3940 page
= pgv_to_page(kaddr
);
3941 err
= vm_insert_page(vma
, start
, page
);
3950 atomic_inc(&po
->mapped
);
3951 vma
->vm_ops
= &packet_mmap_ops
;
3955 mutex_unlock(&po
->pg_vec_lock
);
3959 static const struct proto_ops packet_ops_spkt
= {
3960 .family
= PF_PACKET
,
3961 .owner
= THIS_MODULE
,
3962 .release
= packet_release
,
3963 .bind
= packet_bind_spkt
,
3964 .connect
= sock_no_connect
,
3965 .socketpair
= sock_no_socketpair
,
3966 .accept
= sock_no_accept
,
3967 .getname
= packet_getname_spkt
,
3968 .poll
= datagram_poll
,
3969 .ioctl
= packet_ioctl
,
3970 .listen
= sock_no_listen
,
3971 .shutdown
= sock_no_shutdown
,
3972 .setsockopt
= sock_no_setsockopt
,
3973 .getsockopt
= sock_no_getsockopt
,
3974 .sendmsg
= packet_sendmsg_spkt
,
3975 .recvmsg
= packet_recvmsg
,
3976 .mmap
= sock_no_mmap
,
3977 .sendpage
= sock_no_sendpage
,
3980 static const struct proto_ops packet_ops
= {
3981 .family
= PF_PACKET
,
3982 .owner
= THIS_MODULE
,
3983 .release
= packet_release
,
3984 .bind
= packet_bind
,
3985 .connect
= sock_no_connect
,
3986 .socketpair
= sock_no_socketpair
,
3987 .accept
= sock_no_accept
,
3988 .getname
= packet_getname
,
3989 .poll
= packet_poll
,
3990 .ioctl
= packet_ioctl
,
3991 .listen
= sock_no_listen
,
3992 .shutdown
= sock_no_shutdown
,
3993 .setsockopt
= packet_setsockopt
,
3994 .getsockopt
= packet_getsockopt
,
3995 .sendmsg
= packet_sendmsg
,
3996 .recvmsg
= packet_recvmsg
,
3997 .mmap
= packet_mmap
,
3998 .sendpage
= sock_no_sendpage
,
4001 static const struct net_proto_family packet_family_ops
= {
4002 .family
= PF_PACKET
,
4003 .create
= packet_create
,
4004 .owner
= THIS_MODULE
,
4007 static struct notifier_block packet_netdev_notifier
= {
4008 .notifier_call
= packet_notifier
,
4011 #ifdef CONFIG_PROC_FS
4013 static void *packet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4016 struct net
*net
= seq_file_net(seq
);
4019 return seq_hlist_start_head_rcu(&net
->packet
.sklist
, *pos
);
4022 static void *packet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4024 struct net
*net
= seq_file_net(seq
);
4025 return seq_hlist_next_rcu(v
, &net
->packet
.sklist
, pos
);
4028 static void packet_seq_stop(struct seq_file
*seq
, void *v
)
4034 static int packet_seq_show(struct seq_file
*seq
, void *v
)
4036 if (v
== SEQ_START_TOKEN
)
4037 seq_puts(seq
, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4039 struct sock
*s
= sk_entry(v
);
4040 const struct packet_sock
*po
= pkt_sk(s
);
4043 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4045 atomic_read(&s
->sk_refcnt
),
4050 atomic_read(&s
->sk_rmem_alloc
),
4051 from_kuid_munged(seq_user_ns(seq
), sock_i_uid(s
)),
4058 static const struct seq_operations packet_seq_ops
= {
4059 .start
= packet_seq_start
,
4060 .next
= packet_seq_next
,
4061 .stop
= packet_seq_stop
,
4062 .show
= packet_seq_show
,
4065 static int packet_seq_open(struct inode
*inode
, struct file
*file
)
4067 return seq_open_net(inode
, file
, &packet_seq_ops
,
4068 sizeof(struct seq_net_private
));
4071 static const struct file_operations packet_seq_fops
= {
4072 .owner
= THIS_MODULE
,
4073 .open
= packet_seq_open
,
4075 .llseek
= seq_lseek
,
4076 .release
= seq_release_net
,
4081 static int __net_init
packet_net_init(struct net
*net
)
4083 mutex_init(&net
->packet
.sklist_lock
);
4084 INIT_HLIST_HEAD(&net
->packet
.sklist
);
4086 if (!proc_create("packet", 0, net
->proc_net
, &packet_seq_fops
))
4092 static void __net_exit
packet_net_exit(struct net
*net
)
4094 remove_proc_entry("packet", net
->proc_net
);
4097 static struct pernet_operations packet_net_ops
= {
4098 .init
= packet_net_init
,
4099 .exit
= packet_net_exit
,
4103 static void __exit
packet_exit(void)
4105 unregister_netdevice_notifier(&packet_netdev_notifier
);
4106 unregister_pernet_subsys(&packet_net_ops
);
4107 sock_unregister(PF_PACKET
);
4108 proto_unregister(&packet_proto
);
4111 static int __init
packet_init(void)
4113 int rc
= proto_register(&packet_proto
, 0);
4118 sock_register(&packet_family_ops
);
4119 register_pernet_subsys(&packet_net_ops
);
4120 register_netdevice_notifier(&packet_netdev_notifier
);
4125 module_init(packet_init
);
4126 module_exit(packet_exit
);
4127 MODULE_LICENSE("GPL");
4128 MODULE_ALIAS_NETPROTO(PF_PACKET
);