2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * PACKET - implements raw packet sockets.
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Alan Cox, <gw4pts@gw4pts.ampr.org>
13 * Alan Cox : verify_area() now used correctly
14 * Alan Cox : new skbuff lists, look ma no backlogs!
15 * Alan Cox : tidied skbuff lists.
16 * Alan Cox : Now uses generic datagram routines I
17 * added. Also fixed the peek/read crash
18 * from all old Linux datagram code.
19 * Alan Cox : Uses the improved datagram code.
20 * Alan Cox : Added NULL's for socket options.
21 * Alan Cox : Re-commented the code.
22 * Alan Cox : Use new kernel side addressing
23 * Rob Janssen : Correct MTU usage.
24 * Dave Platt : Counter leaks caused by incorrect
25 * interrupt locking and some slightly
26 * dubious gcc output. Can you read
27 * compiler: it said _VOLATILE_
28 * Richard Kooijman : Timestamp fixes.
29 * Alan Cox : New buffers. Use sk->mac.raw.
30 * Alan Cox : sendmsg/recvmsg support.
31 * Alan Cox : Protocol setting support
32 * Alexey Kuznetsov : Untied from IPv4 stack.
33 * Cyrus Durgin : Fixed kerneld for kmod.
34 * Michal Ostrowski : Module initialization cleanup.
35 * Ulises Alonso : Frame number limit removal and
36 * packet_set_ring memory leak.
37 * Eric Biederman : Allow for > 8 byte hardware addresses.
38 * The convention is that longer addresses
39 * will simply extend the hardware address
40 * byte arrays at the end of sockaddr_ll
42 * Johann Baudy : Added TX RING.
43 * Chetan Loke : Implemented TPACKET_V3 block abstraction
45 * Copyright (C) 2011, <lokec@ccs.neu.edu>
48 * This program is free software; you can redistribute it and/or
49 * modify it under the terms of the GNU General Public License
50 * as published by the Free Software Foundation; either version
51 * 2 of the License, or (at your option) any later version.
55 #include <linux/types.h>
57 #include <linux/capability.h>
58 #include <linux/fcntl.h>
59 #include <linux/socket.h>
61 #include <linux/inet.h>
62 #include <linux/netdevice.h>
63 #include <linux/if_packet.h>
64 #include <linux/wireless.h>
65 #include <linux/kernel.h>
66 #include <linux/kmod.h>
67 #include <linux/slab.h>
68 #include <linux/vmalloc.h>
69 #include <net/net_namespace.h>
71 #include <net/protocol.h>
72 #include <linux/skbuff.h>
74 #include <linux/errno.h>
75 #include <linux/timer.h>
76 #include <asm/uaccess.h>
77 #include <asm/ioctls.h>
79 #include <asm/cacheflush.h>
81 #include <linux/proc_fs.h>
82 #include <linux/seq_file.h>
83 #include <linux/poll.h>
84 #include <linux/module.h>
85 #include <linux/init.h>
86 #include <linux/mutex.h>
87 #include <linux/if_vlan.h>
88 #include <linux/virtio_net.h>
89 #include <linux/errqueue.h>
90 #include <linux/net_tstamp.h>
91 #include <linux/percpu.h>
93 #include <net/inet_common.h>
95 #include <linux/bpf.h>
101 - if device has no dev->hard_header routine, it adds and removes ll header
102 inside itself. In this case ll header is invisible outside of device,
103 but higher levels still should reserve dev->hard_header_len.
104 Some devices are enough clever to reallocate skb, when header
105 will not fit to reserved space (tunnel), another ones are silly
107 - packet socket receives packets with pulled ll header,
108 so that SOCK_RAW should push it back.
113 Incoming, dev->hard_header!=NULL
114 mac_header -> ll header
117 Outgoing, dev->hard_header!=NULL
118 mac_header -> ll header
121 Incoming, dev->hard_header==NULL
122 mac_header -> UNKNOWN position. It is very likely, that it points to ll
123 header. PPP makes it, that is wrong, because introduce
124 assymetry between rx and tx paths.
127 Outgoing, dev->hard_header==NULL
128 mac_header -> data. ll header is still not built!
132 If dev->hard_header==NULL we are unlikely to restore sensible ll header.
138 dev->hard_header != NULL
139 mac_header -> ll header
142 dev->hard_header == NULL (ll header is added by device, we cannot control it)
146 We should set nh.raw on output to correct posistion,
147 packet classifier depends on it.
150 /* Private packet socket structures. */
152 /* identical to struct packet_mreq except it has
153 * a longer address field.
155 struct packet_mreq_max
{
157 unsigned short mr_type
;
158 unsigned short mr_alen
;
159 unsigned char mr_address
[MAX_ADDR_LEN
];
163 struct tpacket_hdr
*h1
;
164 struct tpacket2_hdr
*h2
;
165 struct tpacket3_hdr
*h3
;
169 static int packet_set_ring(struct sock
*sk
, union tpacket_req_u
*req_u
,
170 int closing
, int tx_ring
);
172 #define V3_ALIGNMENT (8)
174 #define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))
176 #define BLK_PLUS_PRIV(sz_of_priv) \
177 (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))
179 #define PGV_FROM_VMALLOC 1
181 #define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
182 #define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts)
183 #define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt)
184 #define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len)
185 #define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num)
186 #define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
187 #define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
190 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
);
191 static int tpacket_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
192 struct packet_type
*pt
, struct net_device
*orig_dev
);
194 static void *packet_previous_frame(struct packet_sock
*po
,
195 struct packet_ring_buffer
*rb
,
197 static void packet_increment_head(struct packet_ring_buffer
*buff
);
198 static int prb_curr_blk_in_use(struct tpacket_kbdq_core
*,
199 struct tpacket_block_desc
*);
200 static void *prb_dispatch_next_block(struct tpacket_kbdq_core
*,
201 struct packet_sock
*);
202 static void prb_retire_current_block(struct tpacket_kbdq_core
*,
203 struct packet_sock
*, unsigned int status
);
204 static int prb_queue_frozen(struct tpacket_kbdq_core
*);
205 static void prb_open_block(struct tpacket_kbdq_core
*,
206 struct tpacket_block_desc
*);
207 static void prb_retire_rx_blk_timer_expired(unsigned long);
208 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core
*);
209 static void prb_init_blk_timer(struct packet_sock
*,
210 struct tpacket_kbdq_core
*,
211 void (*func
) (unsigned long));
212 static void prb_fill_rxhash(struct tpacket_kbdq_core
*, struct tpacket3_hdr
*);
213 static void prb_clear_rxhash(struct tpacket_kbdq_core
*,
214 struct tpacket3_hdr
*);
215 static void prb_fill_vlan_info(struct tpacket_kbdq_core
*,
216 struct tpacket3_hdr
*);
217 static void packet_flush_mclist(struct sock
*sk
);
219 struct packet_skb_cb
{
221 struct sockaddr_pkt pkt
;
223 /* Trick: alias skb original length with
224 * ll.sll_family and ll.protocol in order
227 unsigned int origlen
;
228 struct sockaddr_ll ll
;
233 #define vio_le() virtio_legacy_is_little_endian()
235 #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
237 #define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
238 #define GET_PBLOCK_DESC(x, bid) \
239 ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
240 #define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \
241 ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
242 #define GET_NEXT_PRB_BLK_NUM(x) \
243 (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
244 ((x)->kactive_blk_num+1) : 0)
246 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
);
247 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
);
249 static int packet_direct_xmit(struct sk_buff
*skb
)
251 struct net_device
*dev
= skb
->dev
;
252 netdev_features_t features
;
253 struct netdev_queue
*txq
;
254 int ret
= NETDEV_TX_BUSY
;
256 if (unlikely(!netif_running(dev
) ||
257 !netif_carrier_ok(dev
)))
260 features
= netif_skb_features(skb
);
261 if (skb_needs_linearize(skb
, features
) &&
262 __skb_linearize(skb
))
265 txq
= skb_get_tx_queue(dev
, skb
);
269 HARD_TX_LOCK(dev
, txq
, smp_processor_id());
270 if (!netif_xmit_frozen_or_drv_stopped(txq
))
271 ret
= netdev_start_xmit(skb
, dev
, txq
, false);
272 HARD_TX_UNLOCK(dev
, txq
);
276 if (!dev_xmit_complete(ret
))
281 atomic_long_inc(&dev
->tx_dropped
);
283 return NET_XMIT_DROP
;
286 static struct net_device
*packet_cached_dev_get(struct packet_sock
*po
)
288 struct net_device
*dev
;
291 dev
= rcu_dereference(po
->cached_dev
);
299 static void packet_cached_dev_assign(struct packet_sock
*po
,
300 struct net_device
*dev
)
302 rcu_assign_pointer(po
->cached_dev
, dev
);
305 static void packet_cached_dev_reset(struct packet_sock
*po
)
307 RCU_INIT_POINTER(po
->cached_dev
, NULL
);
310 static bool packet_use_direct_xmit(const struct packet_sock
*po
)
312 return po
->xmit
== packet_direct_xmit
;
315 static u16
__packet_pick_tx_queue(struct net_device
*dev
, struct sk_buff
*skb
)
317 return (u16
) raw_smp_processor_id() % dev
->real_num_tx_queues
;
320 static void packet_pick_tx_queue(struct net_device
*dev
, struct sk_buff
*skb
)
322 const struct net_device_ops
*ops
= dev
->netdev_ops
;
325 if (ops
->ndo_select_queue
) {
326 queue_index
= ops
->ndo_select_queue(dev
, skb
, NULL
,
327 __packet_pick_tx_queue
);
328 queue_index
= netdev_cap_txqueue(dev
, queue_index
);
330 queue_index
= __packet_pick_tx_queue(dev
, skb
);
333 skb_set_queue_mapping(skb
, queue_index
);
336 /* register_prot_hook must be invoked with the po->bind_lock held,
337 * or from a context in which asynchronous accesses to the packet
338 * socket is not possible (packet_create()).
340 static void register_prot_hook(struct sock
*sk
)
342 struct packet_sock
*po
= pkt_sk(sk
);
346 __fanout_link(sk
, po
);
348 dev_add_pack(&po
->prot_hook
);
355 /* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
356 * held. If the sync parameter is true, we will temporarily drop
357 * the po->bind_lock and do a synchronize_net to make sure no
358 * asynchronous packet processing paths still refer to the elements
359 * of po->prot_hook. If the sync parameter is false, it is the
360 * callers responsibility to take care of this.
362 static void __unregister_prot_hook(struct sock
*sk
, bool sync
)
364 struct packet_sock
*po
= pkt_sk(sk
);
369 __fanout_unlink(sk
, po
);
371 __dev_remove_pack(&po
->prot_hook
);
376 spin_unlock(&po
->bind_lock
);
378 spin_lock(&po
->bind_lock
);
382 static void unregister_prot_hook(struct sock
*sk
, bool sync
)
384 struct packet_sock
*po
= pkt_sk(sk
);
387 __unregister_prot_hook(sk
, sync
);
390 static inline struct page
* __pure
pgv_to_page(void *addr
)
392 if (is_vmalloc_addr(addr
))
393 return vmalloc_to_page(addr
);
394 return virt_to_page(addr
);
397 static void __packet_set_status(struct packet_sock
*po
, void *frame
, int status
)
399 union tpacket_uhdr h
;
402 switch (po
->tp_version
) {
404 h
.h1
->tp_status
= status
;
405 flush_dcache_page(pgv_to_page(&h
.h1
->tp_status
));
408 h
.h2
->tp_status
= status
;
409 flush_dcache_page(pgv_to_page(&h
.h2
->tp_status
));
413 WARN(1, "TPACKET version not supported.\n");
420 static int __packet_get_status(struct packet_sock
*po
, void *frame
)
422 union tpacket_uhdr h
;
427 switch (po
->tp_version
) {
429 flush_dcache_page(pgv_to_page(&h
.h1
->tp_status
));
430 return h
.h1
->tp_status
;
432 flush_dcache_page(pgv_to_page(&h
.h2
->tp_status
));
433 return h
.h2
->tp_status
;
436 WARN(1, "TPACKET version not supported.\n");
442 static __u32
tpacket_get_timestamp(struct sk_buff
*skb
, struct timespec
*ts
,
445 struct skb_shared_hwtstamps
*shhwtstamps
= skb_hwtstamps(skb
);
448 (flags
& SOF_TIMESTAMPING_RAW_HARDWARE
) &&
449 ktime_to_timespec_cond(shhwtstamps
->hwtstamp
, ts
))
450 return TP_STATUS_TS_RAW_HARDWARE
;
452 if (ktime_to_timespec_cond(skb
->tstamp
, ts
))
453 return TP_STATUS_TS_SOFTWARE
;
458 static __u32
__packet_set_timestamp(struct packet_sock
*po
, void *frame
,
461 union tpacket_uhdr h
;
465 if (!(ts_status
= tpacket_get_timestamp(skb
, &ts
, po
->tp_tstamp
)))
469 switch (po
->tp_version
) {
471 h
.h1
->tp_sec
= ts
.tv_sec
;
472 h
.h1
->tp_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
475 h
.h2
->tp_sec
= ts
.tv_sec
;
476 h
.h2
->tp_nsec
= ts
.tv_nsec
;
480 WARN(1, "TPACKET version not supported.\n");
484 /* one flush is safe, as both fields always lie on the same cacheline */
485 flush_dcache_page(pgv_to_page(&h
.h1
->tp_sec
));
491 static void *packet_lookup_frame(struct packet_sock
*po
,
492 struct packet_ring_buffer
*rb
,
493 unsigned int position
,
496 unsigned int pg_vec_pos
, frame_offset
;
497 union tpacket_uhdr h
;
499 pg_vec_pos
= position
/ rb
->frames_per_block
;
500 frame_offset
= position
% rb
->frames_per_block
;
502 h
.raw
= rb
->pg_vec
[pg_vec_pos
].buffer
+
503 (frame_offset
* rb
->frame_size
);
505 if (status
!= __packet_get_status(po
, h
.raw
))
511 static void *packet_current_frame(struct packet_sock
*po
,
512 struct packet_ring_buffer
*rb
,
515 return packet_lookup_frame(po
, rb
, rb
->head
, status
);
518 static void prb_del_retire_blk_timer(struct tpacket_kbdq_core
*pkc
)
520 del_timer_sync(&pkc
->retire_blk_timer
);
523 static void prb_shutdown_retire_blk_timer(struct packet_sock
*po
,
524 struct sk_buff_head
*rb_queue
)
526 struct tpacket_kbdq_core
*pkc
;
528 pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
530 spin_lock_bh(&rb_queue
->lock
);
531 pkc
->delete_blk_timer
= 1;
532 spin_unlock_bh(&rb_queue
->lock
);
534 prb_del_retire_blk_timer(pkc
);
537 static void prb_init_blk_timer(struct packet_sock
*po
,
538 struct tpacket_kbdq_core
*pkc
,
539 void (*func
) (unsigned long))
541 init_timer(&pkc
->retire_blk_timer
);
542 pkc
->retire_blk_timer
.data
= (long)po
;
543 pkc
->retire_blk_timer
.function
= func
;
544 pkc
->retire_blk_timer
.expires
= jiffies
;
547 static void prb_setup_retire_blk_timer(struct packet_sock
*po
)
549 struct tpacket_kbdq_core
*pkc
;
551 pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
552 prb_init_blk_timer(po
, pkc
, prb_retire_rx_blk_timer_expired
);
555 static int prb_calc_retire_blk_tmo(struct packet_sock
*po
,
556 int blk_size_in_bytes
)
558 struct net_device
*dev
;
559 unsigned int mbits
= 0, msec
= 0, div
= 0, tmo
= 0;
560 struct ethtool_cmd ecmd
;
565 dev
= __dev_get_by_index(sock_net(&po
->sk
), po
->ifindex
);
566 if (unlikely(!dev
)) {
568 return DEFAULT_PRB_RETIRE_TOV
;
570 err
= __ethtool_get_settings(dev
, &ecmd
);
571 speed
= ethtool_cmd_speed(&ecmd
);
575 * If the link speed is so slow you don't really
576 * need to worry about perf anyways
578 if (speed
< SPEED_1000
|| speed
== SPEED_UNKNOWN
) {
579 return DEFAULT_PRB_RETIRE_TOV
;
586 mbits
= (blk_size_in_bytes
* 8) / (1024 * 1024);
598 static void prb_init_ft_ops(struct tpacket_kbdq_core
*p1
,
599 union tpacket_req_u
*req_u
)
601 p1
->feature_req_word
= req_u
->req3
.tp_feature_req_word
;
604 static void init_prb_bdqc(struct packet_sock
*po
,
605 struct packet_ring_buffer
*rb
,
607 union tpacket_req_u
*req_u
)
609 struct tpacket_kbdq_core
*p1
= GET_PBDQC_FROM_RB(rb
);
610 struct tpacket_block_desc
*pbd
;
612 memset(p1
, 0x0, sizeof(*p1
));
614 p1
->knxt_seq_num
= 1;
616 pbd
= (struct tpacket_block_desc
*)pg_vec
[0].buffer
;
617 p1
->pkblk_start
= pg_vec
[0].buffer
;
618 p1
->kblk_size
= req_u
->req3
.tp_block_size
;
619 p1
->knum_blocks
= req_u
->req3
.tp_block_nr
;
620 p1
->hdrlen
= po
->tp_hdrlen
;
621 p1
->version
= po
->tp_version
;
622 p1
->last_kactive_blk_num
= 0;
623 po
->stats
.stats3
.tp_freeze_q_cnt
= 0;
624 if (req_u
->req3
.tp_retire_blk_tov
)
625 p1
->retire_blk_tov
= req_u
->req3
.tp_retire_blk_tov
;
627 p1
->retire_blk_tov
= prb_calc_retire_blk_tmo(po
,
628 req_u
->req3
.tp_block_size
);
629 p1
->tov_in_jiffies
= msecs_to_jiffies(p1
->retire_blk_tov
);
630 p1
->blk_sizeof_priv
= req_u
->req3
.tp_sizeof_priv
;
632 p1
->max_frame_len
= p1
->kblk_size
- BLK_PLUS_PRIV(p1
->blk_sizeof_priv
);
633 prb_init_ft_ops(p1
, req_u
);
634 prb_setup_retire_blk_timer(po
);
635 prb_open_block(p1
, pbd
);
638 /* Do NOT update the last_blk_num first.
639 * Assumes sk_buff_head lock is held.
641 static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core
*pkc
)
643 mod_timer(&pkc
->retire_blk_timer
,
644 jiffies
+ pkc
->tov_in_jiffies
);
645 pkc
->last_kactive_blk_num
= pkc
->kactive_blk_num
;
650 * 1) We refresh the timer only when we open a block.
651 * By doing this we don't waste cycles refreshing the timer
652 * on packet-by-packet basis.
654 * With a 1MB block-size, on a 1Gbps line, it will take
655 * i) ~8 ms to fill a block + ii) memcpy etc.
656 * In this cut we are not accounting for the memcpy time.
658 * So, if the user sets the 'tmo' to 10ms then the timer
659 * will never fire while the block is still getting filled
660 * (which is what we want). However, the user could choose
661 * to close a block early and that's fine.
663 * But when the timer does fire, we check whether or not to refresh it.
664 * Since the tmo granularity is in msecs, it is not too expensive
665 * to refresh the timer, lets say every '8' msecs.
666 * Either the user can set the 'tmo' or we can derive it based on
667 * a) line-speed and b) block-size.
668 * prb_calc_retire_blk_tmo() calculates the tmo.
671 static void prb_retire_rx_blk_timer_expired(unsigned long data
)
673 struct packet_sock
*po
= (struct packet_sock
*)data
;
674 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
676 struct tpacket_block_desc
*pbd
;
678 spin_lock(&po
->sk
.sk_receive_queue
.lock
);
680 frozen
= prb_queue_frozen(pkc
);
681 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
683 if (unlikely(pkc
->delete_blk_timer
))
686 /* We only need to plug the race when the block is partially filled.
688 * lock(); increment BLOCK_NUM_PKTS; unlock()
689 * copy_bits() is in progress ...
690 * timer fires on other cpu:
691 * we can't retire the current block because copy_bits
695 if (BLOCK_NUM_PKTS(pbd
)) {
696 while (atomic_read(&pkc
->blk_fill_in_prog
)) {
697 /* Waiting for skb_copy_bits to finish... */
702 if (pkc
->last_kactive_blk_num
== pkc
->kactive_blk_num
) {
704 if (!BLOCK_NUM_PKTS(pbd
)) {
705 /* An empty block. Just refresh the timer. */
708 prb_retire_current_block(pkc
, po
, TP_STATUS_BLK_TMO
);
709 if (!prb_dispatch_next_block(pkc
, po
))
714 /* Case 1. Queue was frozen because user-space was
717 if (prb_curr_blk_in_use(pkc
, pbd
)) {
719 * Ok, user-space is still behind.
720 * So just refresh the timer.
724 /* Case 2. queue was frozen,user-space caught up,
725 * now the link went idle && the timer fired.
726 * We don't have a block to close.So we open this
727 * block and restart the timer.
728 * opening a block thaws the queue,restarts timer
729 * Thawing/timer-refresh is a side effect.
731 prb_open_block(pkc
, pbd
);
738 _prb_refresh_rx_retire_blk_timer(pkc
);
741 spin_unlock(&po
->sk
.sk_receive_queue
.lock
);
744 static void prb_flush_block(struct tpacket_kbdq_core
*pkc1
,
745 struct tpacket_block_desc
*pbd1
, __u32 status
)
747 /* Flush everything minus the block header */
749 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
754 /* Skip the block header(we know header WILL fit in 4K) */
757 end
= (u8
*)PAGE_ALIGN((unsigned long)pkc1
->pkblk_end
);
758 for (; start
< end
; start
+= PAGE_SIZE
)
759 flush_dcache_page(pgv_to_page(start
));
764 /* Now update the block status. */
766 BLOCK_STATUS(pbd1
) = status
;
768 /* Flush the block header */
770 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
772 flush_dcache_page(pgv_to_page(start
));
782 * 2) Increment active_blk_num
784 * Note:We DONT refresh the timer on purpose.
785 * Because almost always the next block will be opened.
787 static void prb_close_block(struct tpacket_kbdq_core
*pkc1
,
788 struct tpacket_block_desc
*pbd1
,
789 struct packet_sock
*po
, unsigned int stat
)
791 __u32 status
= TP_STATUS_USER
| stat
;
793 struct tpacket3_hdr
*last_pkt
;
794 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
795 struct sock
*sk
= &po
->sk
;
797 if (po
->stats
.stats3
.tp_drops
)
798 status
|= TP_STATUS_LOSING
;
800 last_pkt
= (struct tpacket3_hdr
*)pkc1
->prev
;
801 last_pkt
->tp_next_offset
= 0;
803 /* Get the ts of the last pkt */
804 if (BLOCK_NUM_PKTS(pbd1
)) {
805 h1
->ts_last_pkt
.ts_sec
= last_pkt
->tp_sec
;
806 h1
->ts_last_pkt
.ts_nsec
= last_pkt
->tp_nsec
;
808 /* Ok, we tmo'd - so get the current time.
810 * It shouldn't really happen as we don't close empty
811 * blocks. See prb_retire_rx_blk_timer_expired().
815 h1
->ts_last_pkt
.ts_sec
= ts
.tv_sec
;
816 h1
->ts_last_pkt
.ts_nsec
= ts
.tv_nsec
;
821 /* Flush the block */
822 prb_flush_block(pkc1
, pbd1
, status
);
824 sk
->sk_data_ready(sk
);
826 pkc1
->kactive_blk_num
= GET_NEXT_PRB_BLK_NUM(pkc1
);
829 static void prb_thaw_queue(struct tpacket_kbdq_core
*pkc
)
831 pkc
->reset_pending_on_curr_blk
= 0;
835 * Side effect of opening a block:
837 * 1) prb_queue is thawed.
838 * 2) retire_blk_timer is refreshed.
841 static void prb_open_block(struct tpacket_kbdq_core
*pkc1
,
842 struct tpacket_block_desc
*pbd1
)
845 struct tpacket_hdr_v1
*h1
= &pbd1
->hdr
.bh1
;
849 /* We could have just memset this but we will lose the
850 * flexibility of making the priv area sticky
853 BLOCK_SNUM(pbd1
) = pkc1
->knxt_seq_num
++;
854 BLOCK_NUM_PKTS(pbd1
) = 0;
855 BLOCK_LEN(pbd1
) = BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
859 h1
->ts_first_pkt
.ts_sec
= ts
.tv_sec
;
860 h1
->ts_first_pkt
.ts_nsec
= ts
.tv_nsec
;
862 pkc1
->pkblk_start
= (char *)pbd1
;
863 pkc1
->nxt_offset
= pkc1
->pkblk_start
+ BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
865 BLOCK_O2FP(pbd1
) = (__u32
)BLK_PLUS_PRIV(pkc1
->blk_sizeof_priv
);
866 BLOCK_O2PRIV(pbd1
) = BLK_HDR_LEN
;
868 pbd1
->version
= pkc1
->version
;
869 pkc1
->prev
= pkc1
->nxt_offset
;
870 pkc1
->pkblk_end
= pkc1
->pkblk_start
+ pkc1
->kblk_size
;
872 prb_thaw_queue(pkc1
);
873 _prb_refresh_rx_retire_blk_timer(pkc1
);
879 * Queue freeze logic:
880 * 1) Assume tp_block_nr = 8 blocks.
881 * 2) At time 't0', user opens Rx ring.
882 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
883 * 4) user-space is either sleeping or processing block '0'.
884 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
885 * it will close block-7,loop around and try to fill block '0'.
887 * __packet_lookup_frame_in_block
888 * prb_retire_current_block()
889 * prb_dispatch_next_block()
890 * |->(BLOCK_STATUS == USER) evaluates to true
891 * 5.1) Since block-0 is currently in-use, we just freeze the queue.
892 * 6) Now there are two cases:
893 * 6.1) Link goes idle right after the queue is frozen.
894 * But remember, the last open_block() refreshed the timer.
895 * When this timer expires,it will refresh itself so that we can
896 * re-open block-0 in near future.
897 * 6.2) Link is busy and keeps on receiving packets. This is a simple
898 * case and __packet_lookup_frame_in_block will check if block-0
899 * is free and can now be re-used.
901 static void prb_freeze_queue(struct tpacket_kbdq_core
*pkc
,
902 struct packet_sock
*po
)
904 pkc
->reset_pending_on_curr_blk
= 1;
905 po
->stats
.stats3
.tp_freeze_q_cnt
++;
908 #define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))
911 * If the next block is free then we will dispatch it
912 * and return a good offset.
913 * Else, we will freeze the queue.
914 * So, caller must check the return value.
916 static void *prb_dispatch_next_block(struct tpacket_kbdq_core
*pkc
,
917 struct packet_sock
*po
)
919 struct tpacket_block_desc
*pbd
;
923 /* 1. Get current block num */
924 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
926 /* 2. If this block is currently in_use then freeze the queue */
927 if (TP_STATUS_USER
& BLOCK_STATUS(pbd
)) {
928 prb_freeze_queue(pkc
, po
);
934 * open this block and return the offset where the first packet
935 * needs to get stored.
937 prb_open_block(pkc
, pbd
);
938 return (void *)pkc
->nxt_offset
;
941 static void prb_retire_current_block(struct tpacket_kbdq_core
*pkc
,
942 struct packet_sock
*po
, unsigned int status
)
944 struct tpacket_block_desc
*pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
946 /* retire/close the current block */
947 if (likely(TP_STATUS_KERNEL
== BLOCK_STATUS(pbd
))) {
949 * Plug the case where copy_bits() is in progress on
950 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
951 * have space to copy the pkt in the current block and
952 * called prb_retire_current_block()
954 * We don't need to worry about the TMO case because
955 * the timer-handler already handled this case.
957 if (!(status
& TP_STATUS_BLK_TMO
)) {
958 while (atomic_read(&pkc
->blk_fill_in_prog
)) {
959 /* Waiting for skb_copy_bits to finish... */
963 prb_close_block(pkc
, pbd
, po
, status
);
968 static int prb_curr_blk_in_use(struct tpacket_kbdq_core
*pkc
,
969 struct tpacket_block_desc
*pbd
)
971 return TP_STATUS_USER
& BLOCK_STATUS(pbd
);
974 static int prb_queue_frozen(struct tpacket_kbdq_core
*pkc
)
976 return pkc
->reset_pending_on_curr_blk
;
979 static void prb_clear_blk_fill_status(struct packet_ring_buffer
*rb
)
981 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
982 atomic_dec(&pkc
->blk_fill_in_prog
);
985 static void prb_fill_rxhash(struct tpacket_kbdq_core
*pkc
,
986 struct tpacket3_hdr
*ppd
)
988 ppd
->hv1
.tp_rxhash
= skb_get_hash(pkc
->skb
);
991 static void prb_clear_rxhash(struct tpacket_kbdq_core
*pkc
,
992 struct tpacket3_hdr
*ppd
)
994 ppd
->hv1
.tp_rxhash
= 0;
997 static void prb_fill_vlan_info(struct tpacket_kbdq_core
*pkc
,
998 struct tpacket3_hdr
*ppd
)
1000 if (skb_vlan_tag_present(pkc
->skb
)) {
1001 ppd
->hv1
.tp_vlan_tci
= skb_vlan_tag_get(pkc
->skb
);
1002 ppd
->hv1
.tp_vlan_tpid
= ntohs(pkc
->skb
->vlan_proto
);
1003 ppd
->tp_status
= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
1005 ppd
->hv1
.tp_vlan_tci
= 0;
1006 ppd
->hv1
.tp_vlan_tpid
= 0;
1007 ppd
->tp_status
= TP_STATUS_AVAILABLE
;
1011 static void prb_run_all_ft_ops(struct tpacket_kbdq_core
*pkc
,
1012 struct tpacket3_hdr
*ppd
)
1014 ppd
->hv1
.tp_padding
= 0;
1015 prb_fill_vlan_info(pkc
, ppd
);
1017 if (pkc
->feature_req_word
& TP_FT_REQ_FILL_RXHASH
)
1018 prb_fill_rxhash(pkc
, ppd
);
1020 prb_clear_rxhash(pkc
, ppd
);
1023 static void prb_fill_curr_block(char *curr
,
1024 struct tpacket_kbdq_core
*pkc
,
1025 struct tpacket_block_desc
*pbd
,
1028 struct tpacket3_hdr
*ppd
;
1030 ppd
= (struct tpacket3_hdr
*)curr
;
1031 ppd
->tp_next_offset
= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1033 pkc
->nxt_offset
+= TOTAL_PKT_LEN_INCL_ALIGN(len
);
1034 BLOCK_LEN(pbd
) += TOTAL_PKT_LEN_INCL_ALIGN(len
);
1035 BLOCK_NUM_PKTS(pbd
) += 1;
1036 atomic_inc(&pkc
->blk_fill_in_prog
);
1037 prb_run_all_ft_ops(pkc
, ppd
);
1040 /* Assumes caller has the sk->rx_queue.lock */
1041 static void *__packet_lookup_frame_in_block(struct packet_sock
*po
,
1042 struct sk_buff
*skb
,
1047 struct tpacket_kbdq_core
*pkc
;
1048 struct tpacket_block_desc
*pbd
;
1051 pkc
= GET_PBDQC_FROM_RB(&po
->rx_ring
);
1052 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1054 /* Queue is frozen when user space is lagging behind */
1055 if (prb_queue_frozen(pkc
)) {
1057 * Check if that last block which caused the queue to freeze,
1058 * is still in_use by user-space.
1060 if (prb_curr_blk_in_use(pkc
, pbd
)) {
1061 /* Can't record this packet */
1065 * Ok, the block was released by user-space.
1066 * Now let's open that block.
1067 * opening a block also thaws the queue.
1068 * Thawing is a side effect.
1070 prb_open_block(pkc
, pbd
);
1075 curr
= pkc
->nxt_offset
;
1077 end
= (char *)pbd
+ pkc
->kblk_size
;
1079 /* first try the current block */
1080 if (curr
+TOTAL_PKT_LEN_INCL_ALIGN(len
) < end
) {
1081 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1082 return (void *)curr
;
1085 /* Ok, close the current block */
1086 prb_retire_current_block(pkc
, po
, 0);
1088 /* Now, try to dispatch the next block */
1089 curr
= (char *)prb_dispatch_next_block(pkc
, po
);
1091 pbd
= GET_CURR_PBLOCK_DESC_FROM_CORE(pkc
);
1092 prb_fill_curr_block(curr
, pkc
, pbd
, len
);
1093 return (void *)curr
;
1097 * No free blocks are available.user_space hasn't caught up yet.
1098 * Queue was just frozen and now this packet will get dropped.
1103 static void *packet_current_rx_frame(struct packet_sock
*po
,
1104 struct sk_buff
*skb
,
1105 int status
, unsigned int len
)
1108 switch (po
->tp_version
) {
1111 curr
= packet_lookup_frame(po
, &po
->rx_ring
,
1112 po
->rx_ring
.head
, status
);
1115 return __packet_lookup_frame_in_block(po
, skb
, status
, len
);
1117 WARN(1, "TPACKET version not supported\n");
1123 static void *prb_lookup_block(struct packet_sock
*po
,
1124 struct packet_ring_buffer
*rb
,
1128 struct tpacket_kbdq_core
*pkc
= GET_PBDQC_FROM_RB(rb
);
1129 struct tpacket_block_desc
*pbd
= GET_PBLOCK_DESC(pkc
, idx
);
1131 if (status
!= BLOCK_STATUS(pbd
))
1136 static int prb_previous_blk_num(struct packet_ring_buffer
*rb
)
1139 if (rb
->prb_bdqc
.kactive_blk_num
)
1140 prev
= rb
->prb_bdqc
.kactive_blk_num
-1;
1142 prev
= rb
->prb_bdqc
.knum_blocks
-1;
1146 /* Assumes caller has held the rx_queue.lock */
1147 static void *__prb_previous_block(struct packet_sock
*po
,
1148 struct packet_ring_buffer
*rb
,
1151 unsigned int previous
= prb_previous_blk_num(rb
);
1152 return prb_lookup_block(po
, rb
, previous
, status
);
1155 static void *packet_previous_rx_frame(struct packet_sock
*po
,
1156 struct packet_ring_buffer
*rb
,
1159 if (po
->tp_version
<= TPACKET_V2
)
1160 return packet_previous_frame(po
, rb
, status
);
1162 return __prb_previous_block(po
, rb
, status
);
1165 static void packet_increment_rx_head(struct packet_sock
*po
,
1166 struct packet_ring_buffer
*rb
)
1168 switch (po
->tp_version
) {
1171 return packet_increment_head(rb
);
1174 WARN(1, "TPACKET version not supported.\n");
1180 static void *packet_previous_frame(struct packet_sock
*po
,
1181 struct packet_ring_buffer
*rb
,
1184 unsigned int previous
= rb
->head
? rb
->head
- 1 : rb
->frame_max
;
1185 return packet_lookup_frame(po
, rb
, previous
, status
);
1188 static void packet_increment_head(struct packet_ring_buffer
*buff
)
1190 buff
->head
= buff
->head
!= buff
->frame_max
? buff
->head
+1 : 0;
1193 static void packet_inc_pending(struct packet_ring_buffer
*rb
)
1195 this_cpu_inc(*rb
->pending_refcnt
);
1198 static void packet_dec_pending(struct packet_ring_buffer
*rb
)
1200 this_cpu_dec(*rb
->pending_refcnt
);
1203 static unsigned int packet_read_pending(const struct packet_ring_buffer
*rb
)
1205 unsigned int refcnt
= 0;
1208 /* We don't use pending refcount in rx_ring. */
1209 if (rb
->pending_refcnt
== NULL
)
1212 for_each_possible_cpu(cpu
)
1213 refcnt
+= *per_cpu_ptr(rb
->pending_refcnt
, cpu
);
1218 static int packet_alloc_pending(struct packet_sock
*po
)
1220 po
->rx_ring
.pending_refcnt
= NULL
;
1222 po
->tx_ring
.pending_refcnt
= alloc_percpu(unsigned int);
1223 if (unlikely(po
->tx_ring
.pending_refcnt
== NULL
))
1229 static void packet_free_pending(struct packet_sock
*po
)
1231 free_percpu(po
->tx_ring
.pending_refcnt
);
1234 #define ROOM_POW_OFF 2
1235 #define ROOM_NONE 0x0
1236 #define ROOM_LOW 0x1
1237 #define ROOM_NORMAL 0x2
1239 static bool __tpacket_has_room(struct packet_sock
*po
, int pow_off
)
1243 len
= po
->rx_ring
.frame_max
+ 1;
1244 idx
= po
->rx_ring
.head
;
1246 idx
+= len
>> pow_off
;
1249 return packet_lookup_frame(po
, &po
->rx_ring
, idx
, TP_STATUS_KERNEL
);
1252 static bool __tpacket_v3_has_room(struct packet_sock
*po
, int pow_off
)
1256 len
= po
->rx_ring
.prb_bdqc
.knum_blocks
;
1257 idx
= po
->rx_ring
.prb_bdqc
.kactive_blk_num
;
1259 idx
+= len
>> pow_off
;
1262 return prb_lookup_block(po
, &po
->rx_ring
, idx
, TP_STATUS_KERNEL
);
1265 static int __packet_rcv_has_room(struct packet_sock
*po
, struct sk_buff
*skb
)
1267 struct sock
*sk
= &po
->sk
;
1268 int ret
= ROOM_NONE
;
1270 if (po
->prot_hook
.func
!= tpacket_rcv
) {
1271 int avail
= sk
->sk_rcvbuf
- atomic_read(&sk
->sk_rmem_alloc
)
1272 - (skb
? skb
->truesize
: 0);
1273 if (avail
> (sk
->sk_rcvbuf
>> ROOM_POW_OFF
))
1281 if (po
->tp_version
== TPACKET_V3
) {
1282 if (__tpacket_v3_has_room(po
, ROOM_POW_OFF
))
1284 else if (__tpacket_v3_has_room(po
, 0))
1287 if (__tpacket_has_room(po
, ROOM_POW_OFF
))
1289 else if (__tpacket_has_room(po
, 0))
1296 static int packet_rcv_has_room(struct packet_sock
*po
, struct sk_buff
*skb
)
1301 spin_lock_bh(&po
->sk
.sk_receive_queue
.lock
);
1302 ret
= __packet_rcv_has_room(po
, skb
);
1303 has_room
= ret
== ROOM_NORMAL
;
1304 if (po
->pressure
== has_room
)
1305 po
->pressure
= !has_room
;
1306 spin_unlock_bh(&po
->sk
.sk_receive_queue
.lock
);
1311 static void packet_sock_destruct(struct sock
*sk
)
1313 skb_queue_purge(&sk
->sk_error_queue
);
1315 WARN_ON(atomic_read(&sk
->sk_rmem_alloc
));
1316 WARN_ON(atomic_read(&sk
->sk_wmem_alloc
));
1318 if (!sock_flag(sk
, SOCK_DEAD
)) {
1319 pr_err("Attempt to release alive packet socket: %p\n", sk
);
1323 sk_refcnt_debug_dec(sk
);
1326 static bool fanout_flow_is_huge(struct packet_sock
*po
, struct sk_buff
*skb
)
1331 rxhash
= skb_get_hash(skb
);
1332 for (i
= 0; i
< ROLLOVER_HLEN
; i
++)
1333 if (po
->rollover
->history
[i
] == rxhash
)
1336 po
->rollover
->history
[prandom_u32() % ROLLOVER_HLEN
] = rxhash
;
1337 return count
> (ROLLOVER_HLEN
>> 1);
1340 static unsigned int fanout_demux_hash(struct packet_fanout
*f
,
1341 struct sk_buff
*skb
,
1344 return reciprocal_scale(skb_get_hash(skb
), num
);
1347 static unsigned int fanout_demux_lb(struct packet_fanout
*f
,
1348 struct sk_buff
*skb
,
1351 unsigned int val
= atomic_inc_return(&f
->rr_cur
);
1356 static unsigned int fanout_demux_cpu(struct packet_fanout
*f
,
1357 struct sk_buff
*skb
,
1360 return smp_processor_id() % num
;
1363 static unsigned int fanout_demux_rnd(struct packet_fanout
*f
,
1364 struct sk_buff
*skb
,
1367 return prandom_u32_max(num
);
1370 static unsigned int fanout_demux_rollover(struct packet_fanout
*f
,
1371 struct sk_buff
*skb
,
1372 unsigned int idx
, bool try_self
,
1375 struct packet_sock
*po
, *po_next
, *po_skip
= NULL
;
1376 unsigned int i
, j
, room
= ROOM_NONE
;
1378 po
= pkt_sk(f
->arr
[idx
]);
1381 room
= packet_rcv_has_room(po
, skb
);
1382 if (room
== ROOM_NORMAL
||
1383 (room
== ROOM_LOW
&& !fanout_flow_is_huge(po
, skb
)))
1388 i
= j
= min_t(int, po
->rollover
->sock
, num
- 1);
1390 po_next
= pkt_sk(f
->arr
[i
]);
1391 if (po_next
!= po_skip
&& !po_next
->pressure
&&
1392 packet_rcv_has_room(po_next
, skb
) == ROOM_NORMAL
) {
1394 po
->rollover
->sock
= i
;
1395 atomic_long_inc(&po
->rollover
->num
);
1396 if (room
== ROOM_LOW
)
1397 atomic_long_inc(&po
->rollover
->num_huge
);
1405 atomic_long_inc(&po
->rollover
->num_failed
);
1409 static unsigned int fanout_demux_qm(struct packet_fanout
*f
,
1410 struct sk_buff
*skb
,
1413 return skb_get_queue_mapping(skb
) % num
;
1416 static unsigned int fanout_demux_bpf(struct packet_fanout
*f
,
1417 struct sk_buff
*skb
,
1420 struct bpf_prog
*prog
;
1421 unsigned int ret
= 0;
1424 prog
= rcu_dereference(f
->bpf_prog
);
1426 ret
= bpf_prog_run_clear_cb(prog
, skb
) % num
;
1432 static bool fanout_has_flag(struct packet_fanout
*f
, u16 flag
)
1434 return f
->flags
& (flag
>> 8);
1437 static int packet_rcv_fanout(struct sk_buff
*skb
, struct net_device
*dev
,
1438 struct packet_type
*pt
, struct net_device
*orig_dev
)
1440 struct packet_fanout
*f
= pt
->af_packet_priv
;
1441 unsigned int num
= READ_ONCE(f
->num_members
);
1442 struct packet_sock
*po
;
1445 if (!net_eq(dev_net(dev
), read_pnet(&f
->net
)) ||
1451 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_DEFRAG
)) {
1452 skb
= ip_check_defrag(skb
, IP_DEFRAG_AF_PACKET
);
1457 case PACKET_FANOUT_HASH
:
1459 idx
= fanout_demux_hash(f
, skb
, num
);
1461 case PACKET_FANOUT_LB
:
1462 idx
= fanout_demux_lb(f
, skb
, num
);
1464 case PACKET_FANOUT_CPU
:
1465 idx
= fanout_demux_cpu(f
, skb
, num
);
1467 case PACKET_FANOUT_RND
:
1468 idx
= fanout_demux_rnd(f
, skb
, num
);
1470 case PACKET_FANOUT_QM
:
1471 idx
= fanout_demux_qm(f
, skb
, num
);
1473 case PACKET_FANOUT_ROLLOVER
:
1474 idx
= fanout_demux_rollover(f
, skb
, 0, false, num
);
1476 case PACKET_FANOUT_CBPF
:
1477 case PACKET_FANOUT_EBPF
:
1478 idx
= fanout_demux_bpf(f
, skb
, num
);
1482 if (fanout_has_flag(f
, PACKET_FANOUT_FLAG_ROLLOVER
))
1483 idx
= fanout_demux_rollover(f
, skb
, idx
, true, num
);
1485 po
= pkt_sk(f
->arr
[idx
]);
1486 return po
->prot_hook
.func(skb
, dev
, &po
->prot_hook
, orig_dev
);
1489 DEFINE_MUTEX(fanout_mutex
);
1490 EXPORT_SYMBOL_GPL(fanout_mutex
);
1491 static LIST_HEAD(fanout_list
);
1493 static void __fanout_link(struct sock
*sk
, struct packet_sock
*po
)
1495 struct packet_fanout
*f
= po
->fanout
;
1497 spin_lock(&f
->lock
);
1498 f
->arr
[f
->num_members
] = sk
;
1501 spin_unlock(&f
->lock
);
1504 static void __fanout_unlink(struct sock
*sk
, struct packet_sock
*po
)
1506 struct packet_fanout
*f
= po
->fanout
;
1509 spin_lock(&f
->lock
);
1510 for (i
= 0; i
< f
->num_members
; i
++) {
1511 if (f
->arr
[i
] == sk
)
1514 BUG_ON(i
>= f
->num_members
);
1515 f
->arr
[i
] = f
->arr
[f
->num_members
- 1];
1517 spin_unlock(&f
->lock
);
1520 static bool match_fanout_group(struct packet_type
*ptype
, struct sock
*sk
)
1522 if (sk
->sk_family
!= PF_PACKET
)
1525 return ptype
->af_packet_priv
== pkt_sk(sk
)->fanout
;
1528 static void fanout_init_data(struct packet_fanout
*f
)
1531 case PACKET_FANOUT_LB
:
1532 atomic_set(&f
->rr_cur
, 0);
1534 case PACKET_FANOUT_CBPF
:
1535 case PACKET_FANOUT_EBPF
:
1536 RCU_INIT_POINTER(f
->bpf_prog
, NULL
);
1541 static void __fanout_set_data_bpf(struct packet_fanout
*f
, struct bpf_prog
*new)
1543 struct bpf_prog
*old
;
1545 spin_lock(&f
->lock
);
1546 old
= rcu_dereference_protected(f
->bpf_prog
, lockdep_is_held(&f
->lock
));
1547 rcu_assign_pointer(f
->bpf_prog
, new);
1548 spin_unlock(&f
->lock
);
1552 bpf_prog_destroy(old
);
1556 static int fanout_set_data_cbpf(struct packet_sock
*po
, char __user
*data
,
1559 struct bpf_prog
*new;
1560 struct sock_fprog fprog
;
1563 if (sock_flag(&po
->sk
, SOCK_FILTER_LOCKED
))
1565 if (len
!= sizeof(fprog
))
1567 if (copy_from_user(&fprog
, data
, len
))
1570 ret
= bpf_prog_create_from_user(&new, &fprog
, NULL
, false);
1574 __fanout_set_data_bpf(po
->fanout
, new);
1578 static int fanout_set_data_ebpf(struct packet_sock
*po
, char __user
*data
,
1581 struct bpf_prog
*new;
1584 if (sock_flag(&po
->sk
, SOCK_FILTER_LOCKED
))
1586 if (len
!= sizeof(fd
))
1588 if (copy_from_user(&fd
, data
, len
))
1591 new = bpf_prog_get(fd
);
1593 return PTR_ERR(new);
1594 if (new->type
!= BPF_PROG_TYPE_SOCKET_FILTER
) {
1599 __fanout_set_data_bpf(po
->fanout
, new);
1603 static int fanout_set_data(struct packet_sock
*po
, char __user
*data
,
1606 switch (po
->fanout
->type
) {
1607 case PACKET_FANOUT_CBPF
:
1608 return fanout_set_data_cbpf(po
, data
, len
);
1609 case PACKET_FANOUT_EBPF
:
1610 return fanout_set_data_ebpf(po
, data
, len
);
1616 static void fanout_release_data(struct packet_fanout
*f
)
1619 case PACKET_FANOUT_CBPF
:
1620 case PACKET_FANOUT_EBPF
:
1621 __fanout_set_data_bpf(f
, NULL
);
1625 static int fanout_add(struct sock
*sk
, u16 id
, u16 type_flags
)
1627 struct packet_sock
*po
= pkt_sk(sk
);
1628 struct packet_fanout
*f
, *match
;
1629 u8 type
= type_flags
& 0xff;
1630 u8 flags
= type_flags
>> 8;
1634 case PACKET_FANOUT_ROLLOVER
:
1635 if (type_flags
& PACKET_FANOUT_FLAG_ROLLOVER
)
1637 case PACKET_FANOUT_HASH
:
1638 case PACKET_FANOUT_LB
:
1639 case PACKET_FANOUT_CPU
:
1640 case PACKET_FANOUT_RND
:
1641 case PACKET_FANOUT_QM
:
1642 case PACKET_FANOUT_CBPF
:
1643 case PACKET_FANOUT_EBPF
:
1655 if (type
== PACKET_FANOUT_ROLLOVER
||
1656 (type_flags
& PACKET_FANOUT_FLAG_ROLLOVER
)) {
1657 po
->rollover
= kzalloc(sizeof(*po
->rollover
), GFP_KERNEL
);
1660 atomic_long_set(&po
->rollover
->num
, 0);
1661 atomic_long_set(&po
->rollover
->num_huge
, 0);
1662 atomic_long_set(&po
->rollover
->num_failed
, 0);
1665 mutex_lock(&fanout_mutex
);
1667 list_for_each_entry(f
, &fanout_list
, list
) {
1669 read_pnet(&f
->net
) == sock_net(sk
)) {
1675 if (match
&& match
->flags
!= flags
)
1679 match
= kzalloc(sizeof(*match
), GFP_KERNEL
);
1682 write_pnet(&match
->net
, sock_net(sk
));
1685 match
->flags
= flags
;
1686 INIT_LIST_HEAD(&match
->list
);
1687 spin_lock_init(&match
->lock
);
1688 atomic_set(&match
->sk_ref
, 0);
1689 fanout_init_data(match
);
1690 match
->prot_hook
.type
= po
->prot_hook
.type
;
1691 match
->prot_hook
.dev
= po
->prot_hook
.dev
;
1692 match
->prot_hook
.func
= packet_rcv_fanout
;
1693 match
->prot_hook
.af_packet_priv
= match
;
1694 match
->prot_hook
.id_match
= match_fanout_group
;
1695 dev_add_pack(&match
->prot_hook
);
1696 list_add(&match
->list
, &fanout_list
);
1699 if (match
->type
== type
&&
1700 match
->prot_hook
.type
== po
->prot_hook
.type
&&
1701 match
->prot_hook
.dev
== po
->prot_hook
.dev
) {
1703 if (atomic_read(&match
->sk_ref
) < PACKET_FANOUT_MAX
) {
1704 __dev_remove_pack(&po
->prot_hook
);
1706 atomic_inc(&match
->sk_ref
);
1707 __fanout_link(sk
, po
);
1712 mutex_unlock(&fanout_mutex
);
1714 kfree(po
->rollover
);
1715 po
->rollover
= NULL
;
1720 static void fanout_release(struct sock
*sk
)
1722 struct packet_sock
*po
= pkt_sk(sk
);
1723 struct packet_fanout
*f
;
1729 mutex_lock(&fanout_mutex
);
1732 if (atomic_dec_and_test(&f
->sk_ref
)) {
1734 dev_remove_pack(&f
->prot_hook
);
1735 fanout_release_data(f
);
1738 mutex_unlock(&fanout_mutex
);
1741 kfree_rcu(po
->rollover
, rcu
);
1744 static const struct proto_ops packet_ops
;
1746 static const struct proto_ops packet_ops_spkt
;
1748 static int packet_rcv_spkt(struct sk_buff
*skb
, struct net_device
*dev
,
1749 struct packet_type
*pt
, struct net_device
*orig_dev
)
1752 struct sockaddr_pkt
*spkt
;
1755 * When we registered the protocol we saved the socket in the data
1756 * field for just this event.
1759 sk
= pt
->af_packet_priv
;
1762 * Yank back the headers [hope the device set this
1763 * right or kerboom...]
1765 * Incoming packets have ll header pulled,
1768 * For outgoing ones skb->data == skb_mac_header(skb)
1769 * so that this procedure is noop.
1772 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1775 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1778 skb
= skb_share_check(skb
, GFP_ATOMIC
);
1782 /* drop any routing info */
1785 /* drop conntrack reference */
1788 spkt
= &PACKET_SKB_CB(skb
)->sa
.pkt
;
1790 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1793 * The SOCK_PACKET socket receives _all_ frames.
1796 spkt
->spkt_family
= dev
->type
;
1797 strlcpy(spkt
->spkt_device
, dev
->name
, sizeof(spkt
->spkt_device
));
1798 spkt
->spkt_protocol
= skb
->protocol
;
1801 * Charge the memory to the socket. This is done specifically
1802 * to prevent sockets using all the memory up.
1805 if (sock_queue_rcv_skb(sk
, skb
) == 0)
1816 * Output a raw packet to a device layer. This bypasses all the other
1817 * protocol layers and you must therefore supply it with a complete frame
1820 static int packet_sendmsg_spkt(struct socket
*sock
, struct msghdr
*msg
,
1823 struct sock
*sk
= sock
->sk
;
1824 DECLARE_SOCKADDR(struct sockaddr_pkt
*, saddr
, msg
->msg_name
);
1825 struct sk_buff
*skb
= NULL
;
1826 struct net_device
*dev
;
1832 * Get and verify the address.
1836 if (msg
->msg_namelen
< sizeof(struct sockaddr
))
1838 if (msg
->msg_namelen
== sizeof(struct sockaddr_pkt
))
1839 proto
= saddr
->spkt_protocol
;
1841 return -ENOTCONN
; /* SOCK_PACKET must be sent giving an address */
1844 * Find the device first to size check it
1847 saddr
->spkt_device
[sizeof(saddr
->spkt_device
) - 1] = 0;
1850 dev
= dev_get_by_name_rcu(sock_net(sk
), saddr
->spkt_device
);
1856 if (!(dev
->flags
& IFF_UP
))
1860 * You may not queue a frame bigger than the mtu. This is the lowest level
1861 * raw protocol and you must do your own fragmentation at this level.
1864 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
1865 if (!netif_supports_nofcs(dev
)) {
1866 err
= -EPROTONOSUPPORT
;
1869 extra_len
= 4; /* We're doing our own CRC */
1873 if (len
> dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
+ extra_len
)
1877 size_t reserved
= LL_RESERVED_SPACE(dev
);
1878 int tlen
= dev
->needed_tailroom
;
1879 unsigned int hhlen
= dev
->header_ops
? dev
->hard_header_len
: 0;
1882 skb
= sock_wmalloc(sk
, len
+ reserved
+ tlen
, 0, GFP_KERNEL
);
1885 /* FIXME: Save some space for broken drivers that write a hard
1886 * header at transmission time by themselves. PPP is the notable
1887 * one here. This should really be fixed at the driver level.
1889 skb_reserve(skb
, reserved
);
1890 skb_reset_network_header(skb
);
1892 /* Try to align data part correctly */
1897 skb_reset_network_header(skb
);
1899 err
= memcpy_from_msg(skb_put(skb
, len
), msg
, len
);
1905 if (len
> (dev
->mtu
+ dev
->hard_header_len
+ extra_len
)) {
1906 /* Earlier code assumed this would be a VLAN pkt,
1907 * double-check this now that we have the actual
1910 struct ethhdr
*ehdr
;
1911 skb_reset_mac_header(skb
);
1912 ehdr
= eth_hdr(skb
);
1913 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
1919 skb
->protocol
= proto
;
1921 skb
->priority
= sk
->sk_priority
;
1922 skb
->mark
= sk
->sk_mark
;
1924 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
1926 if (unlikely(extra_len
== 4))
1929 skb_probe_transport_header(skb
, 0);
1931 dev_queue_xmit(skb
);
1942 static unsigned int run_filter(struct sk_buff
*skb
,
1943 const struct sock
*sk
,
1946 struct sk_filter
*filter
;
1949 filter
= rcu_dereference(sk
->sk_filter
);
1951 res
= bpf_prog_run_clear_cb(filter
->prog
, skb
);
1958 * This function makes lazy skb cloning in hope that most of packets
1959 * are discarded by BPF.
1961 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
1962 * and skb->cb are mangled. It works because (and until) packets
1963 * falling here are owned by current CPU. Output packets are cloned
1964 * by dev_queue_xmit_nit(), input packets are processed by net_bh
1965 * sequencially, so that if we return skb to original state on exit,
1966 * we will not harm anyone.
1969 static int packet_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
1970 struct packet_type
*pt
, struct net_device
*orig_dev
)
1973 struct sockaddr_ll
*sll
;
1974 struct packet_sock
*po
;
1975 u8
*skb_head
= skb
->data
;
1976 int skb_len
= skb
->len
;
1977 unsigned int snaplen
, res
;
1979 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1982 sk
= pt
->af_packet_priv
;
1985 if (!net_eq(dev_net(dev
), sock_net(sk
)))
1990 if (dev
->header_ops
) {
1991 /* The device has an explicit notion of ll header,
1992 * exported to higher levels.
1994 * Otherwise, the device hides details of its frame
1995 * structure, so that corresponding packet head is
1996 * never delivered to user.
1998 if (sk
->sk_type
!= SOCK_DGRAM
)
1999 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2000 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
2001 /* Special case: outgoing packets have ll header at head */
2002 skb_pull(skb
, skb_network_offset(skb
));
2008 res
= run_filter(skb
, sk
, snaplen
);
2010 goto drop_n_restore
;
2014 if (atomic_read(&sk
->sk_rmem_alloc
) >= sk
->sk_rcvbuf
)
2017 if (skb_shared(skb
)) {
2018 struct sk_buff
*nskb
= skb_clone(skb
, GFP_ATOMIC
);
2022 if (skb_head
!= skb
->data
) {
2023 skb
->data
= skb_head
;
2030 sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb
)) + MAX_ADDR_LEN
- 8);
2032 sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
2033 sll
->sll_hatype
= dev
->type
;
2034 sll
->sll_pkttype
= skb
->pkt_type
;
2035 if (unlikely(po
->origdev
))
2036 sll
->sll_ifindex
= orig_dev
->ifindex
;
2038 sll
->sll_ifindex
= dev
->ifindex
;
2040 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
2042 /* sll->sll_family and sll->sll_protocol are set in packet_recvmsg().
2043 * Use their space for storing the original skb length.
2045 PACKET_SKB_CB(skb
)->sa
.origlen
= skb
->len
;
2047 if (pskb_trim(skb
, snaplen
))
2050 skb_set_owner_r(skb
, sk
);
2054 /* drop conntrack reference */
2057 spin_lock(&sk
->sk_receive_queue
.lock
);
2058 po
->stats
.stats1
.tp_packets
++;
2059 sock_skb_set_dropcount(sk
, skb
);
2060 __skb_queue_tail(&sk
->sk_receive_queue
, skb
);
2061 spin_unlock(&sk
->sk_receive_queue
.lock
);
2062 sk
->sk_data_ready(sk
);
2066 spin_lock(&sk
->sk_receive_queue
.lock
);
2067 po
->stats
.stats1
.tp_drops
++;
2068 atomic_inc(&sk
->sk_drops
);
2069 spin_unlock(&sk
->sk_receive_queue
.lock
);
2072 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
2073 skb
->data
= skb_head
;
2081 static int tpacket_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
2082 struct packet_type
*pt
, struct net_device
*orig_dev
)
2085 struct packet_sock
*po
;
2086 struct sockaddr_ll
*sll
;
2087 union tpacket_uhdr h
;
2088 u8
*skb_head
= skb
->data
;
2089 int skb_len
= skb
->len
;
2090 unsigned int snaplen
, res
;
2091 unsigned long status
= TP_STATUS_USER
;
2092 unsigned short macoff
, netoff
, hdrlen
;
2093 struct sk_buff
*copy_skb
= NULL
;
2097 /* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT.
2098 * We may add members to them until current aligned size without forcing
2099 * userspace to call getsockopt(..., PACKET_HDRLEN, ...).
2101 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h2
)) != 32);
2102 BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h
.h3
)) != 48);
2104 if (skb
->pkt_type
== PACKET_LOOPBACK
)
2107 sk
= pt
->af_packet_priv
;
2110 if (!net_eq(dev_net(dev
), sock_net(sk
)))
2113 if (dev
->header_ops
) {
2114 if (sk
->sk_type
!= SOCK_DGRAM
)
2115 skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2116 else if (skb
->pkt_type
== PACKET_OUTGOING
) {
2117 /* Special case: outgoing packets have ll header at head */
2118 skb_pull(skb
, skb_network_offset(skb
));
2124 res
= run_filter(skb
, sk
, snaplen
);
2126 goto drop_n_restore
;
2128 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
2129 status
|= TP_STATUS_CSUMNOTREADY
;
2130 else if (skb
->pkt_type
!= PACKET_OUTGOING
&&
2131 (skb
->ip_summed
== CHECKSUM_COMPLETE
||
2132 skb_csum_unnecessary(skb
)))
2133 status
|= TP_STATUS_CSUM_VALID
;
2138 if (sk
->sk_type
== SOCK_DGRAM
) {
2139 macoff
= netoff
= TPACKET_ALIGN(po
->tp_hdrlen
) + 16 +
2142 unsigned int maclen
= skb_network_offset(skb
);
2143 netoff
= TPACKET_ALIGN(po
->tp_hdrlen
+
2144 (maclen
< 16 ? 16 : maclen
)) +
2146 macoff
= netoff
- maclen
;
2148 if (po
->tp_version
<= TPACKET_V2
) {
2149 if (macoff
+ snaplen
> po
->rx_ring
.frame_size
) {
2150 if (po
->copy_thresh
&&
2151 atomic_read(&sk
->sk_rmem_alloc
) < sk
->sk_rcvbuf
) {
2152 if (skb_shared(skb
)) {
2153 copy_skb
= skb_clone(skb
, GFP_ATOMIC
);
2155 copy_skb
= skb_get(skb
);
2156 skb_head
= skb
->data
;
2159 skb_set_owner_r(copy_skb
, sk
);
2161 snaplen
= po
->rx_ring
.frame_size
- macoff
;
2162 if ((int)snaplen
< 0)
2165 } else if (unlikely(macoff
+ snaplen
>
2166 GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
)) {
2169 nval
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
- macoff
;
2170 pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
2171 snaplen
, nval
, macoff
);
2173 if (unlikely((int)snaplen
< 0)) {
2175 macoff
= GET_PBDQC_FROM_RB(&po
->rx_ring
)->max_frame_len
;
2178 spin_lock(&sk
->sk_receive_queue
.lock
);
2179 h
.raw
= packet_current_rx_frame(po
, skb
,
2180 TP_STATUS_KERNEL
, (macoff
+snaplen
));
2183 if (po
->tp_version
<= TPACKET_V2
) {
2184 packet_increment_rx_head(po
, &po
->rx_ring
);
2186 * LOSING will be reported till you read the stats,
2187 * because it's COR - Clear On Read.
2188 * Anyways, moving it for V1/V2 only as V3 doesn't need this
2191 if (po
->stats
.stats1
.tp_drops
)
2192 status
|= TP_STATUS_LOSING
;
2194 po
->stats
.stats1
.tp_packets
++;
2196 status
|= TP_STATUS_COPY
;
2197 __skb_queue_tail(&sk
->sk_receive_queue
, copy_skb
);
2199 spin_unlock(&sk
->sk_receive_queue
.lock
);
2201 skb_copy_bits(skb
, 0, h
.raw
+ macoff
, snaplen
);
2203 if (!(ts_status
= tpacket_get_timestamp(skb
, &ts
, po
->tp_tstamp
)))
2204 getnstimeofday(&ts
);
2206 status
|= ts_status
;
2208 switch (po
->tp_version
) {
2210 h
.h1
->tp_len
= skb
->len
;
2211 h
.h1
->tp_snaplen
= snaplen
;
2212 h
.h1
->tp_mac
= macoff
;
2213 h
.h1
->tp_net
= netoff
;
2214 h
.h1
->tp_sec
= ts
.tv_sec
;
2215 h
.h1
->tp_usec
= ts
.tv_nsec
/ NSEC_PER_USEC
;
2216 hdrlen
= sizeof(*h
.h1
);
2219 h
.h2
->tp_len
= skb
->len
;
2220 h
.h2
->tp_snaplen
= snaplen
;
2221 h
.h2
->tp_mac
= macoff
;
2222 h
.h2
->tp_net
= netoff
;
2223 h
.h2
->tp_sec
= ts
.tv_sec
;
2224 h
.h2
->tp_nsec
= ts
.tv_nsec
;
2225 if (skb_vlan_tag_present(skb
)) {
2226 h
.h2
->tp_vlan_tci
= skb_vlan_tag_get(skb
);
2227 h
.h2
->tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
2228 status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
2230 h
.h2
->tp_vlan_tci
= 0;
2231 h
.h2
->tp_vlan_tpid
= 0;
2233 memset(h
.h2
->tp_padding
, 0, sizeof(h
.h2
->tp_padding
));
2234 hdrlen
= sizeof(*h
.h2
);
2237 /* tp_nxt_offset,vlan are already populated above.
2238 * So DONT clear those fields here
2240 h
.h3
->tp_status
|= status
;
2241 h
.h3
->tp_len
= skb
->len
;
2242 h
.h3
->tp_snaplen
= snaplen
;
2243 h
.h3
->tp_mac
= macoff
;
2244 h
.h3
->tp_net
= netoff
;
2245 h
.h3
->tp_sec
= ts
.tv_sec
;
2246 h
.h3
->tp_nsec
= ts
.tv_nsec
;
2247 memset(h
.h3
->tp_padding
, 0, sizeof(h
.h3
->tp_padding
));
2248 hdrlen
= sizeof(*h
.h3
);
2254 sll
= h
.raw
+ TPACKET_ALIGN(hdrlen
);
2255 sll
->sll_halen
= dev_parse_header(skb
, sll
->sll_addr
);
2256 sll
->sll_family
= AF_PACKET
;
2257 sll
->sll_hatype
= dev
->type
;
2258 sll
->sll_protocol
= skb
->protocol
;
2259 sll
->sll_pkttype
= skb
->pkt_type
;
2260 if (unlikely(po
->origdev
))
2261 sll
->sll_ifindex
= orig_dev
->ifindex
;
2263 sll
->sll_ifindex
= dev
->ifindex
;
2267 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
2268 if (po
->tp_version
<= TPACKET_V2
) {
2271 end
= (u8
*) PAGE_ALIGN((unsigned long) h
.raw
+
2274 for (start
= h
.raw
; start
< end
; start
+= PAGE_SIZE
)
2275 flush_dcache_page(pgv_to_page(start
));
2280 if (po
->tp_version
<= TPACKET_V2
) {
2281 __packet_set_status(po
, h
.raw
, status
);
2282 sk
->sk_data_ready(sk
);
2284 prb_clear_blk_fill_status(&po
->rx_ring
);
2288 if (skb_head
!= skb
->data
&& skb_shared(skb
)) {
2289 skb
->data
= skb_head
;
2297 po
->stats
.stats1
.tp_drops
++;
2298 spin_unlock(&sk
->sk_receive_queue
.lock
);
2300 sk
->sk_data_ready(sk
);
2301 kfree_skb(copy_skb
);
2302 goto drop_n_restore
;
2305 static void tpacket_destruct_skb(struct sk_buff
*skb
)
2307 struct packet_sock
*po
= pkt_sk(skb
->sk
);
2309 if (likely(po
->tx_ring
.pg_vec
)) {
2313 ph
= skb_shinfo(skb
)->destructor_arg
;
2314 packet_dec_pending(&po
->tx_ring
);
2316 ts
= __packet_set_timestamp(po
, ph
, skb
);
2317 __packet_set_status(po
, ph
, TP_STATUS_AVAILABLE
| ts
);
2323 static bool ll_header_truncated(const struct net_device
*dev
, int len
)
2325 /* net device doesn't like empty head */
2326 if (unlikely(len
<= dev
->hard_header_len
)) {
2327 net_warn_ratelimited("%s: packet size is too short (%d <= %d)\n",
2328 current
->comm
, len
, dev
->hard_header_len
);
2335 static int tpacket_fill_skb(struct packet_sock
*po
, struct sk_buff
*skb
,
2336 void *frame
, struct net_device
*dev
, int size_max
,
2337 __be16 proto
, unsigned char *addr
, int hlen
)
2339 union tpacket_uhdr ph
;
2340 int to_write
, offset
, len
, tp_len
, nr_frags
, len_max
;
2341 struct socket
*sock
= po
->sk
.sk_socket
;
2348 skb
->protocol
= proto
;
2350 skb
->priority
= po
->sk
.sk_priority
;
2351 skb
->mark
= po
->sk
.sk_mark
;
2352 sock_tx_timestamp(&po
->sk
, &skb_shinfo(skb
)->tx_flags
);
2353 skb_shinfo(skb
)->destructor_arg
= ph
.raw
;
2355 switch (po
->tp_version
) {
2357 tp_len
= ph
.h2
->tp_len
;
2360 tp_len
= ph
.h1
->tp_len
;
2363 if (unlikely(tp_len
> size_max
)) {
2364 pr_err("packet size is too long (%d > %d)\n", tp_len
, size_max
);
2368 skb_reserve(skb
, hlen
);
2369 skb_reset_network_header(skb
);
2371 if (!packet_use_direct_xmit(po
))
2372 skb_probe_transport_header(skb
, 0);
2373 if (unlikely(po
->tp_tx_has_off
)) {
2374 int off_min
, off_max
, off
;
2375 off_min
= po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2376 off_max
= po
->tx_ring
.frame_size
- tp_len
;
2377 if (sock
->type
== SOCK_DGRAM
) {
2378 switch (po
->tp_version
) {
2380 off
= ph
.h2
->tp_net
;
2383 off
= ph
.h1
->tp_net
;
2387 switch (po
->tp_version
) {
2389 off
= ph
.h2
->tp_mac
;
2392 off
= ph
.h1
->tp_mac
;
2396 if (unlikely((off
< off_min
) || (off_max
< off
)))
2398 data
= ph
.raw
+ off
;
2400 data
= ph
.raw
+ po
->tp_hdrlen
- sizeof(struct sockaddr_ll
);
2404 if (sock
->type
== SOCK_DGRAM
) {
2405 err
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
,
2407 if (unlikely(err
< 0))
2409 } else if (dev
->hard_header_len
) {
2410 if (ll_header_truncated(dev
, tp_len
))
2413 skb_push(skb
, dev
->hard_header_len
);
2414 err
= skb_store_bits(skb
, 0, data
,
2415 dev
->hard_header_len
);
2419 data
+= dev
->hard_header_len
;
2420 to_write
-= dev
->hard_header_len
;
2423 offset
= offset_in_page(data
);
2424 len_max
= PAGE_SIZE
- offset
;
2425 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2427 skb
->data_len
= to_write
;
2428 skb
->len
+= to_write
;
2429 skb
->truesize
+= to_write
;
2430 atomic_add(to_write
, &po
->sk
.sk_wmem_alloc
);
2432 while (likely(to_write
)) {
2433 nr_frags
= skb_shinfo(skb
)->nr_frags
;
2435 if (unlikely(nr_frags
>= MAX_SKB_FRAGS
)) {
2436 pr_err("Packet exceed the number of skb frags(%lu)\n",
2441 page
= pgv_to_page(data
);
2443 flush_dcache_page(page
);
2445 skb_fill_page_desc(skb
, nr_frags
, page
, offset
, len
);
2448 len_max
= PAGE_SIZE
;
2449 len
= ((to_write
> len_max
) ? len_max
: to_write
);
2455 static int tpacket_snd(struct packet_sock
*po
, struct msghdr
*msg
)
2457 struct sk_buff
*skb
;
2458 struct net_device
*dev
;
2460 int err
, reserve
= 0;
2462 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2463 bool need_wait
= !(msg
->msg_flags
& MSG_DONTWAIT
);
2464 int tp_len
, size_max
;
2465 unsigned char *addr
;
2467 int status
= TP_STATUS_AVAILABLE
;
2470 mutex_lock(&po
->pg_vec_lock
);
2472 if (likely(saddr
== NULL
)) {
2473 dev
= packet_cached_dev_get(po
);
2478 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2480 if (msg
->msg_namelen
< (saddr
->sll_halen
2481 + offsetof(struct sockaddr_ll
,
2484 proto
= saddr
->sll_protocol
;
2485 addr
= saddr
->sll_addr
;
2486 dev
= dev_get_by_index(sock_net(&po
->sk
), saddr
->sll_ifindex
);
2490 if (unlikely(dev
== NULL
))
2493 if (unlikely(!(dev
->flags
& IFF_UP
)))
2496 reserve
= dev
->hard_header_len
+ VLAN_HLEN
;
2497 size_max
= po
->tx_ring
.frame_size
2498 - (po
->tp_hdrlen
- sizeof(struct sockaddr_ll
));
2500 if (size_max
> dev
->mtu
+ reserve
)
2501 size_max
= dev
->mtu
+ reserve
;
2504 ph
= packet_current_frame(po
, &po
->tx_ring
,
2505 TP_STATUS_SEND_REQUEST
);
2506 if (unlikely(ph
== NULL
)) {
2507 if (need_wait
&& need_resched())
2512 status
= TP_STATUS_SEND_REQUEST
;
2513 hlen
= LL_RESERVED_SPACE(dev
);
2514 tlen
= dev
->needed_tailroom
;
2515 skb
= sock_alloc_send_skb(&po
->sk
,
2516 hlen
+ tlen
+ sizeof(struct sockaddr_ll
),
2519 if (unlikely(skb
== NULL
)) {
2520 /* we assume the socket was initially writeable ... */
2521 if (likely(len_sum
> 0))
2525 tp_len
= tpacket_fill_skb(po
, skb
, ph
, dev
, size_max
, proto
,
2527 if (likely(tp_len
>= 0) &&
2528 tp_len
> dev
->mtu
+ dev
->hard_header_len
) {
2529 struct ethhdr
*ehdr
;
2530 /* Earlier code assumed this would be a VLAN pkt,
2531 * double-check this now that we have the actual
2535 skb_reset_mac_header(skb
);
2536 ehdr
= eth_hdr(skb
);
2537 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
))
2540 if (unlikely(tp_len
< 0)) {
2542 __packet_set_status(po
, ph
,
2543 TP_STATUS_AVAILABLE
);
2544 packet_increment_head(&po
->tx_ring
);
2548 status
= TP_STATUS_WRONG_FORMAT
;
2554 packet_pick_tx_queue(dev
, skb
);
2556 skb
->destructor
= tpacket_destruct_skb
;
2557 __packet_set_status(po
, ph
, TP_STATUS_SENDING
);
2558 packet_inc_pending(&po
->tx_ring
);
2560 status
= TP_STATUS_SEND_REQUEST
;
2561 err
= po
->xmit(skb
);
2562 if (unlikely(err
> 0)) {
2563 err
= net_xmit_errno(err
);
2564 if (err
&& __packet_get_status(po
, ph
) ==
2565 TP_STATUS_AVAILABLE
) {
2566 /* skb was destructed already */
2571 * skb was dropped but not destructed yet;
2572 * let's treat it like congestion or err < 0
2576 packet_increment_head(&po
->tx_ring
);
2578 } while (likely((ph
!= NULL
) ||
2579 /* Note: packet_read_pending() might be slow if we have
2580 * to call it as it's per_cpu variable, but in fast-path
2581 * we already short-circuit the loop with the first
2582 * condition, and luckily don't have to go that path
2585 (need_wait
&& packet_read_pending(&po
->tx_ring
))));
2591 __packet_set_status(po
, ph
, status
);
2596 mutex_unlock(&po
->pg_vec_lock
);
2600 static struct sk_buff
*packet_alloc_skb(struct sock
*sk
, size_t prepad
,
2601 size_t reserve
, size_t len
,
2602 size_t linear
, int noblock
,
2605 struct sk_buff
*skb
;
2607 /* Under a page? Don't bother with paged skb. */
2608 if (prepad
+ len
< PAGE_SIZE
|| !linear
)
2611 skb
= sock_alloc_send_pskb(sk
, prepad
+ linear
, len
- linear
, noblock
,
2616 skb_reserve(skb
, reserve
);
2617 skb_put(skb
, linear
);
2618 skb
->data_len
= len
- linear
;
2619 skb
->len
+= len
- linear
;
2624 static int packet_snd(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
2626 struct sock
*sk
= sock
->sk
;
2627 DECLARE_SOCKADDR(struct sockaddr_ll
*, saddr
, msg
->msg_name
);
2628 struct sk_buff
*skb
;
2629 struct net_device
*dev
;
2631 unsigned char *addr
;
2632 int err
, reserve
= 0;
2633 struct sockcm_cookie sockc
;
2634 struct virtio_net_hdr vnet_hdr
= { 0 };
2637 struct packet_sock
*po
= pkt_sk(sk
);
2638 unsigned short gso_type
= 0;
2644 * Get and verify the address.
2647 if (likely(saddr
== NULL
)) {
2648 dev
= packet_cached_dev_get(po
);
2653 if (msg
->msg_namelen
< sizeof(struct sockaddr_ll
))
2655 if (msg
->msg_namelen
< (saddr
->sll_halen
+ offsetof(struct sockaddr_ll
, sll_addr
)))
2657 proto
= saddr
->sll_protocol
;
2658 addr
= saddr
->sll_addr
;
2659 dev
= dev_get_by_index(sock_net(sk
), saddr
->sll_ifindex
);
2663 if (unlikely(dev
== NULL
))
2666 if (unlikely(!(dev
->flags
& IFF_UP
)))
2669 sockc
.mark
= sk
->sk_mark
;
2670 if (msg
->msg_controllen
) {
2671 err
= sock_cmsg_send(sk
, msg
, &sockc
);
2676 if (sock
->type
== SOCK_RAW
)
2677 reserve
= dev
->hard_header_len
;
2678 if (po
->has_vnet_hdr
) {
2679 vnet_hdr_len
= sizeof(vnet_hdr
);
2682 if (len
< vnet_hdr_len
)
2685 len
-= vnet_hdr_len
;
2688 n
= copy_from_iter(&vnet_hdr
, vnet_hdr_len
, &msg
->msg_iter
);
2689 if (n
!= vnet_hdr_len
)
2692 if ((vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) &&
2693 (__virtio16_to_cpu(vio_le(), vnet_hdr
.csum_start
) +
2694 __virtio16_to_cpu(vio_le(), vnet_hdr
.csum_offset
) + 2 >
2695 __virtio16_to_cpu(vio_le(), vnet_hdr
.hdr_len
)))
2696 vnet_hdr
.hdr_len
= __cpu_to_virtio16(vio_le(),
2697 __virtio16_to_cpu(vio_le(), vnet_hdr
.csum_start
) +
2698 __virtio16_to_cpu(vio_le(), vnet_hdr
.csum_offset
) + 2);
2701 if (__virtio16_to_cpu(vio_le(), vnet_hdr
.hdr_len
) > len
)
2704 if (vnet_hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
2705 switch (vnet_hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
2706 case VIRTIO_NET_HDR_GSO_TCPV4
:
2707 gso_type
= SKB_GSO_TCPV4
;
2709 case VIRTIO_NET_HDR_GSO_TCPV6
:
2710 gso_type
= SKB_GSO_TCPV6
;
2712 case VIRTIO_NET_HDR_GSO_UDP
:
2713 gso_type
= SKB_GSO_UDP
;
2719 if (vnet_hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
2720 gso_type
|= SKB_GSO_TCP_ECN
;
2722 if (vnet_hdr
.gso_size
== 0)
2728 if (unlikely(sock_flag(sk
, SOCK_NOFCS
))) {
2729 if (!netif_supports_nofcs(dev
)) {
2730 err
= -EPROTONOSUPPORT
;
2733 extra_len
= 4; /* We're doing our own CRC */
2737 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ VLAN_HLEN
+ extra_len
))
2741 hlen
= LL_RESERVED_SPACE(dev
);
2742 tlen
= dev
->needed_tailroom
;
2743 skb
= packet_alloc_skb(sk
, hlen
+ tlen
, hlen
, len
,
2744 __virtio16_to_cpu(vio_le(), vnet_hdr
.hdr_len
),
2745 msg
->msg_flags
& MSG_DONTWAIT
, &err
);
2749 skb_set_network_header(skb
, reserve
);
2752 if (sock
->type
== SOCK_DGRAM
) {
2753 offset
= dev_hard_header(skb
, dev
, ntohs(proto
), addr
, NULL
, len
);
2754 if (unlikely(offset
< 0))
2757 if (ll_header_truncated(dev
, len
))
2761 /* Returns -EFAULT on error */
2762 err
= skb_copy_datagram_from_iter(skb
, offset
, &msg
->msg_iter
, len
);
2766 sock_tx_timestamp(sk
, &skb_shinfo(skb
)->tx_flags
);
2768 if (!gso_type
&& (len
> dev
->mtu
+ reserve
+ extra_len
)) {
2769 /* Earlier code assumed this would be a VLAN pkt,
2770 * double-check this now that we have the actual
2773 struct ethhdr
*ehdr
;
2774 skb_reset_mac_header(skb
);
2775 ehdr
= eth_hdr(skb
);
2776 if (ehdr
->h_proto
!= htons(ETH_P_8021Q
)) {
2782 skb
->protocol
= proto
;
2784 skb
->priority
= sk
->sk_priority
;
2785 skb
->mark
= sockc
.mark
;
2787 packet_pick_tx_queue(dev
, skb
);
2789 if (po
->has_vnet_hdr
) {
2790 if (vnet_hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
2791 u16 s
= __virtio16_to_cpu(vio_le(), vnet_hdr
.csum_start
);
2792 u16 o
= __virtio16_to_cpu(vio_le(), vnet_hdr
.csum_offset
);
2793 if (!skb_partial_csum_set(skb
, s
, o
)) {
2799 skb_shinfo(skb
)->gso_size
=
2800 __virtio16_to_cpu(vio_le(), vnet_hdr
.gso_size
);
2801 skb_shinfo(skb
)->gso_type
= gso_type
;
2803 /* Header must be checked, and gso_segs computed. */
2804 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
2805 skb_shinfo(skb
)->gso_segs
= 0;
2807 len
+= vnet_hdr_len
;
2810 if (!packet_use_direct_xmit(po
))
2811 skb_probe_transport_header(skb
, reserve
);
2812 if (unlikely(extra_len
== 4))
2815 err
= po
->xmit(skb
);
2816 if (err
> 0 && (err
= net_xmit_errno(err
)) != 0)
2832 static int packet_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
2834 struct sock
*sk
= sock
->sk
;
2835 struct packet_sock
*po
= pkt_sk(sk
);
2837 if (po
->tx_ring
.pg_vec
)
2838 return tpacket_snd(po
, msg
);
2840 return packet_snd(sock
, msg
, len
);
2844 * Close a PACKET socket. This is fairly simple. We immediately go
2845 * to 'closed' state and remove our protocol entry in the device list.
2848 static int packet_release(struct socket
*sock
)
2850 struct sock
*sk
= sock
->sk
;
2851 struct packet_sock
*po
;
2853 union tpacket_req_u req_u
;
2861 mutex_lock(&net
->packet
.sklist_lock
);
2862 sk_del_node_init_rcu(sk
);
2863 mutex_unlock(&net
->packet
.sklist_lock
);
2866 sock_prot_inuse_add(net
, sk
->sk_prot
, -1);
2869 spin_lock(&po
->bind_lock
);
2870 unregister_prot_hook(sk
, false);
2871 packet_cached_dev_reset(po
);
2873 if (po
->prot_hook
.dev
) {
2874 dev_put(po
->prot_hook
.dev
);
2875 po
->prot_hook
.dev
= NULL
;
2877 spin_unlock(&po
->bind_lock
);
2879 packet_flush_mclist(sk
);
2881 if (po
->rx_ring
.pg_vec
) {
2882 memset(&req_u
, 0, sizeof(req_u
));
2883 packet_set_ring(sk
, &req_u
, 1, 0);
2886 if (po
->tx_ring
.pg_vec
) {
2887 memset(&req_u
, 0, sizeof(req_u
));
2888 packet_set_ring(sk
, &req_u
, 1, 1);
2895 * Now the socket is dead. No more input will appear.
2902 skb_queue_purge(&sk
->sk_receive_queue
);
2903 packet_free_pending(po
);
2904 sk_refcnt_debug_release(sk
);
2911 * Attach a packet hook.
2914 static int packet_do_bind(struct sock
*sk
, struct net_device
*dev
, __be16 proto
)
2916 struct packet_sock
*po
= pkt_sk(sk
);
2917 struct net_device
*dev_curr
;
2929 spin_lock(&po
->bind_lock
);
2931 proto_curr
= po
->prot_hook
.type
;
2932 dev_curr
= po
->prot_hook
.dev
;
2934 need_rehook
= proto_curr
!= proto
|| dev_curr
!= dev
;
2937 unregister_prot_hook(sk
, true);
2940 po
->prot_hook
.type
= proto
;
2941 po
->prot_hook
.dev
= dev
;
2943 po
->ifindex
= dev
? dev
->ifindex
: 0;
2944 packet_cached_dev_assign(po
, dev
);
2949 if (proto
== 0 || !need_rehook
)
2952 if (!dev
|| (dev
->flags
& IFF_UP
)) {
2953 register_prot_hook(sk
);
2955 sk
->sk_err
= ENETDOWN
;
2956 if (!sock_flag(sk
, SOCK_DEAD
))
2957 sk
->sk_error_report(sk
);
2961 spin_unlock(&po
->bind_lock
);
2967 * Bind a packet socket to a device
2970 static int packet_bind_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
2973 struct sock
*sk
= sock
->sk
;
2975 struct net_device
*dev
;
2982 if (addr_len
!= sizeof(struct sockaddr
))
2984 strlcpy(name
, uaddr
->sa_data
, sizeof(name
));
2986 dev
= dev_get_by_name(sock_net(sk
), name
);
2988 err
= packet_do_bind(sk
, dev
, pkt_sk(sk
)->num
);
2992 static int packet_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
2994 struct sockaddr_ll
*sll
= (struct sockaddr_ll
*)uaddr
;
2995 struct sock
*sk
= sock
->sk
;
2996 struct net_device
*dev
= NULL
;
3004 if (addr_len
< sizeof(struct sockaddr_ll
))
3006 if (sll
->sll_family
!= AF_PACKET
)
3009 if (sll
->sll_ifindex
) {
3011 dev
= dev_get_by_index(sock_net(sk
), sll
->sll_ifindex
);
3015 err
= packet_do_bind(sk
, dev
, sll
->sll_protocol
? : pkt_sk(sk
)->num
);
3021 static struct proto packet_proto
= {
3023 .owner
= THIS_MODULE
,
3024 .obj_size
= sizeof(struct packet_sock
),
3028 * Create a packet of type SOCK_PACKET.
3031 static int packet_create(struct net
*net
, struct socket
*sock
, int protocol
,
3035 struct packet_sock
*po
;
3036 __be16 proto
= (__force __be16
)protocol
; /* weird, but documented */
3039 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
))
3041 if (sock
->type
!= SOCK_DGRAM
&& sock
->type
!= SOCK_RAW
&&
3042 sock
->type
!= SOCK_PACKET
)
3043 return -ESOCKTNOSUPPORT
;
3045 sock
->state
= SS_UNCONNECTED
;
3048 sk
= sk_alloc(net
, PF_PACKET
, GFP_KERNEL
, &packet_proto
, kern
);
3052 sock
->ops
= &packet_ops
;
3053 if (sock
->type
== SOCK_PACKET
)
3054 sock
->ops
= &packet_ops_spkt
;
3056 sock_init_data(sock
, sk
);
3059 sk
->sk_family
= PF_PACKET
;
3061 po
->xmit
= dev_queue_xmit
;
3063 err
= packet_alloc_pending(po
);
3067 packet_cached_dev_reset(po
);
3069 sk
->sk_destruct
= packet_sock_destruct
;
3070 sk_refcnt_debug_inc(sk
);
3073 * Attach a protocol block
3076 spin_lock_init(&po
->bind_lock
);
3077 mutex_init(&po
->pg_vec_lock
);
3078 po
->rollover
= NULL
;
3079 po
->prot_hook
.func
= packet_rcv
;
3081 if (sock
->type
== SOCK_PACKET
)
3082 po
->prot_hook
.func
= packet_rcv_spkt
;
3084 po
->prot_hook
.af_packet_priv
= sk
;
3087 po
->prot_hook
.type
= proto
;
3088 register_prot_hook(sk
);
3091 mutex_lock(&net
->packet
.sklist_lock
);
3092 sk_add_node_rcu(sk
, &net
->packet
.sklist
);
3093 mutex_unlock(&net
->packet
.sklist_lock
);
3096 sock_prot_inuse_add(net
, &packet_proto
, 1);
3107 * Pull a packet from our receive queue and hand it to the user.
3108 * If necessary we block.
3111 static int packet_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
,
3114 struct sock
*sk
= sock
->sk
;
3115 struct sk_buff
*skb
;
3117 int vnet_hdr_len
= 0;
3118 unsigned int origlen
= 0;
3121 if (flags
& ~(MSG_PEEK
|MSG_DONTWAIT
|MSG_TRUNC
|MSG_CMSG_COMPAT
|MSG_ERRQUEUE
))
3125 /* What error should we return now? EUNATTACH? */
3126 if (pkt_sk(sk
)->ifindex
< 0)
3130 if (flags
& MSG_ERRQUEUE
) {
3131 err
= sock_recv_errqueue(sk
, msg
, len
,
3132 SOL_PACKET
, PACKET_TX_TIMESTAMP
);
3137 * Call the generic datagram receiver. This handles all sorts
3138 * of horrible races and re-entrancy so we can forget about it
3139 * in the protocol layers.
3141 * Now it will return ENETDOWN, if device have just gone down,
3142 * but then it will block.
3145 skb
= skb_recv_datagram(sk
, flags
, flags
& MSG_DONTWAIT
, &err
);
3148 * An error occurred so return it. Because skb_recv_datagram()
3149 * handles the blocking we don't see and worry about blocking
3156 if (pkt_sk(sk
)->pressure
)
3157 packet_rcv_has_room(pkt_sk(sk
), NULL
);
3159 if (pkt_sk(sk
)->has_vnet_hdr
) {
3160 struct virtio_net_hdr vnet_hdr
= { 0 };
3163 vnet_hdr_len
= sizeof(vnet_hdr
);
3164 if (len
< vnet_hdr_len
)
3167 len
-= vnet_hdr_len
;
3169 if (skb_is_gso(skb
)) {
3170 struct skb_shared_info
*sinfo
= skb_shinfo(skb
);
3172 /* This is a hint as to how much should be linear. */
3174 __cpu_to_virtio16(vio_le(), skb_headlen(skb
));
3176 __cpu_to_virtio16(vio_le(), sinfo
->gso_size
);
3177 if (sinfo
->gso_type
& SKB_GSO_TCPV4
)
3178 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
3179 else if (sinfo
->gso_type
& SKB_GSO_TCPV6
)
3180 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
3181 else if (sinfo
->gso_type
& SKB_GSO_UDP
)
3182 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
3183 else if (sinfo
->gso_type
& SKB_GSO_FCOE
)
3187 if (sinfo
->gso_type
& SKB_GSO_TCP_ECN
)
3188 vnet_hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
3190 vnet_hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
3192 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
3193 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
3194 vnet_hdr
.csum_start
= __cpu_to_virtio16(vio_le(),
3195 skb_checksum_start_offset(skb
));
3196 vnet_hdr
.csum_offset
= __cpu_to_virtio16(vio_le(),
3198 } else if (skb
->ip_summed
== CHECKSUM_UNNECESSARY
) {
3199 vnet_hdr
.flags
= VIRTIO_NET_HDR_F_DATA_VALID
;
3200 } /* else everything is zero */
3202 err
= memcpy_to_msg(msg
, (void *)&vnet_hdr
, vnet_hdr_len
);
3207 /* You lose any data beyond the buffer you gave. If it worries
3208 * a user program they can ask the device for its MTU
3214 msg
->msg_flags
|= MSG_TRUNC
;
3217 err
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
3221 if (sock
->type
!= SOCK_PACKET
) {
3222 struct sockaddr_ll
*sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
3224 /* Original length was stored in sockaddr_ll fields */
3225 origlen
= PACKET_SKB_CB(skb
)->sa
.origlen
;
3226 sll
->sll_family
= AF_PACKET
;
3227 sll
->sll_protocol
= skb
->protocol
;
3230 sock_recv_ts_and_drops(msg
, sk
, skb
);
3232 if (msg
->msg_name
) {
3233 /* If the address length field is there to be filled
3234 * in, we fill it in now.
3236 if (sock
->type
== SOCK_PACKET
) {
3237 __sockaddr_check_size(sizeof(struct sockaddr_pkt
));
3238 msg
->msg_namelen
= sizeof(struct sockaddr_pkt
);
3240 struct sockaddr_ll
*sll
= &PACKET_SKB_CB(skb
)->sa
.ll
;
3242 msg
->msg_namelen
= sll
->sll_halen
+
3243 offsetof(struct sockaddr_ll
, sll_addr
);
3245 memcpy(msg
->msg_name
, &PACKET_SKB_CB(skb
)->sa
,
3249 if (pkt_sk(sk
)->auxdata
) {
3250 struct tpacket_auxdata aux
;
3252 aux
.tp_status
= TP_STATUS_USER
;
3253 if (skb
->ip_summed
== CHECKSUM_PARTIAL
)
3254 aux
.tp_status
|= TP_STATUS_CSUMNOTREADY
;
3255 else if (skb
->pkt_type
!= PACKET_OUTGOING
&&
3256 (skb
->ip_summed
== CHECKSUM_COMPLETE
||
3257 skb_csum_unnecessary(skb
)))
3258 aux
.tp_status
|= TP_STATUS_CSUM_VALID
;
3260 aux
.tp_len
= origlen
;
3261 aux
.tp_snaplen
= skb
->len
;
3263 aux
.tp_net
= skb_network_offset(skb
);
3264 if (skb_vlan_tag_present(skb
)) {
3265 aux
.tp_vlan_tci
= skb_vlan_tag_get(skb
);
3266 aux
.tp_vlan_tpid
= ntohs(skb
->vlan_proto
);
3267 aux
.tp_status
|= TP_STATUS_VLAN_VALID
| TP_STATUS_VLAN_TPID_VALID
;
3269 aux
.tp_vlan_tci
= 0;
3270 aux
.tp_vlan_tpid
= 0;
3272 put_cmsg(msg
, SOL_PACKET
, PACKET_AUXDATA
, sizeof(aux
), &aux
);
3276 * Free or return the buffer as appropriate. Again this
3277 * hides all the races and re-entrancy issues from us.
3279 err
= vnet_hdr_len
+ ((flags
&MSG_TRUNC
) ? skb
->len
: copied
);
3282 skb_free_datagram(sk
, skb
);
3287 static int packet_getname_spkt(struct socket
*sock
, struct sockaddr
*uaddr
,
3288 int *uaddr_len
, int peer
)
3290 struct net_device
*dev
;
3291 struct sock
*sk
= sock
->sk
;
3296 uaddr
->sa_family
= AF_PACKET
;
3297 memset(uaddr
->sa_data
, 0, sizeof(uaddr
->sa_data
));
3299 dev
= dev_get_by_index_rcu(sock_net(sk
), pkt_sk(sk
)->ifindex
);
3301 strlcpy(uaddr
->sa_data
, dev
->name
, sizeof(uaddr
->sa_data
));
3303 *uaddr_len
= sizeof(*uaddr
);
3308 static int packet_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
3309 int *uaddr_len
, int peer
)
3311 struct net_device
*dev
;
3312 struct sock
*sk
= sock
->sk
;
3313 struct packet_sock
*po
= pkt_sk(sk
);
3314 DECLARE_SOCKADDR(struct sockaddr_ll
*, sll
, uaddr
);
3319 sll
->sll_family
= AF_PACKET
;
3320 sll
->sll_ifindex
= po
->ifindex
;
3321 sll
->sll_protocol
= po
->num
;
3322 sll
->sll_pkttype
= 0;
3324 dev
= dev_get_by_index_rcu(sock_net(sk
), po
->ifindex
);
3326 sll
->sll_hatype
= dev
->type
;
3327 sll
->sll_halen
= dev
->addr_len
;
3328 memcpy(sll
->sll_addr
, dev
->dev_addr
, dev
->addr_len
);
3330 sll
->sll_hatype
= 0; /* Bad: we have no ARPHRD_UNSPEC */
3334 *uaddr_len
= offsetof(struct sockaddr_ll
, sll_addr
) + sll
->sll_halen
;
3339 static int packet_dev_mc(struct net_device
*dev
, struct packet_mclist
*i
,
3343 case PACKET_MR_MULTICAST
:
3344 if (i
->alen
!= dev
->addr_len
)
3347 return dev_mc_add(dev
, i
->addr
);
3349 return dev_mc_del(dev
, i
->addr
);
3351 case PACKET_MR_PROMISC
:
3352 return dev_set_promiscuity(dev
, what
);
3353 case PACKET_MR_ALLMULTI
:
3354 return dev_set_allmulti(dev
, what
);
3355 case PACKET_MR_UNICAST
:
3356 if (i
->alen
!= dev
->addr_len
)
3359 return dev_uc_add(dev
, i
->addr
);
3361 return dev_uc_del(dev
, i
->addr
);
3369 static void packet_dev_mclist_delete(struct net_device
*dev
,
3370 struct packet_mclist
**mlp
)
3372 struct packet_mclist
*ml
;
3374 while ((ml
= *mlp
) != NULL
) {
3375 if (ml
->ifindex
== dev
->ifindex
) {
3376 packet_dev_mc(dev
, ml
, -1);
3384 static int packet_mc_add(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3386 struct packet_sock
*po
= pkt_sk(sk
);
3387 struct packet_mclist
*ml
, *i
;
3388 struct net_device
*dev
;
3394 dev
= __dev_get_by_index(sock_net(sk
), mreq
->mr_ifindex
);
3399 if (mreq
->mr_alen
> dev
->addr_len
)
3403 i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
3408 for (ml
= po
->mclist
; ml
; ml
= ml
->next
) {
3409 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3410 ml
->type
== mreq
->mr_type
&&
3411 ml
->alen
== mreq
->mr_alen
&&
3412 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3414 /* Free the new element ... */
3420 i
->type
= mreq
->mr_type
;
3421 i
->ifindex
= mreq
->mr_ifindex
;
3422 i
->alen
= mreq
->mr_alen
;
3423 memcpy(i
->addr
, mreq
->mr_address
, i
->alen
);
3425 i
->next
= po
->mclist
;
3427 err
= packet_dev_mc(dev
, i
, 1);
3429 po
->mclist
= i
->next
;
3438 static int packet_mc_drop(struct sock
*sk
, struct packet_mreq_max
*mreq
)
3440 struct packet_mclist
*ml
, **mlp
;
3444 for (mlp
= &pkt_sk(sk
)->mclist
; (ml
= *mlp
) != NULL
; mlp
= &ml
->next
) {
3445 if (ml
->ifindex
== mreq
->mr_ifindex
&&
3446 ml
->type
== mreq
->mr_type
&&
3447 ml
->alen
== mreq
->mr_alen
&&
3448 memcmp(ml
->addr
, mreq
->mr_address
, ml
->alen
) == 0) {
3449 if (--ml
->count
== 0) {
3450 struct net_device
*dev
;
3452 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3454 packet_dev_mc(dev
, ml
, -1);
3464 static void packet_flush_mclist(struct sock
*sk
)
3466 struct packet_sock
*po
= pkt_sk(sk
);
3467 struct packet_mclist
*ml
;
3473 while ((ml
= po
->mclist
) != NULL
) {
3474 struct net_device
*dev
;
3476 po
->mclist
= ml
->next
;
3477 dev
= __dev_get_by_index(sock_net(sk
), ml
->ifindex
);
3479 packet_dev_mc(dev
, ml
, -1);
3486 packet_setsockopt(struct socket
*sock
, int level
, int optname
, char __user
*optval
, unsigned int optlen
)
3488 struct sock
*sk
= sock
->sk
;
3489 struct packet_sock
*po
= pkt_sk(sk
);
3492 if (level
!= SOL_PACKET
)
3493 return -ENOPROTOOPT
;
3496 case PACKET_ADD_MEMBERSHIP
:
3497 case PACKET_DROP_MEMBERSHIP
:
3499 struct packet_mreq_max mreq
;
3501 memset(&mreq
, 0, sizeof(mreq
));
3502 if (len
< sizeof(struct packet_mreq
))
3504 if (len
> sizeof(mreq
))
3506 if (copy_from_user(&mreq
, optval
, len
))
3508 if (len
< (mreq
.mr_alen
+ offsetof(struct packet_mreq
, mr_address
)))
3510 if (optname
== PACKET_ADD_MEMBERSHIP
)
3511 ret
= packet_mc_add(sk
, &mreq
);
3513 ret
= packet_mc_drop(sk
, &mreq
);
3517 case PACKET_RX_RING
:
3518 case PACKET_TX_RING
:
3520 union tpacket_req_u req_u
;
3523 switch (po
->tp_version
) {
3526 len
= sizeof(req_u
.req
);
3530 len
= sizeof(req_u
.req3
);
3535 if (pkt_sk(sk
)->has_vnet_hdr
)
3537 if (copy_from_user(&req_u
.req
, optval
, len
))
3539 return packet_set_ring(sk
, &req_u
, 0,
3540 optname
== PACKET_TX_RING
);
3542 case PACKET_COPY_THRESH
:
3546 if (optlen
!= sizeof(val
))
3548 if (copy_from_user(&val
, optval
, sizeof(val
)))
3551 pkt_sk(sk
)->copy_thresh
= val
;
3554 case PACKET_VERSION
:
3558 if (optlen
!= sizeof(val
))
3560 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3562 if (copy_from_user(&val
, optval
, sizeof(val
)))
3568 po
->tp_version
= val
;
3574 case PACKET_RESERVE
:
3578 if (optlen
!= sizeof(val
))
3580 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3582 if (copy_from_user(&val
, optval
, sizeof(val
)))
3584 po
->tp_reserve
= val
;
3591 if (optlen
!= sizeof(val
))
3593 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3595 if (copy_from_user(&val
, optval
, sizeof(val
)))
3597 po
->tp_loss
= !!val
;
3600 case PACKET_AUXDATA
:
3604 if (optlen
< sizeof(val
))
3606 if (copy_from_user(&val
, optval
, sizeof(val
)))
3609 po
->auxdata
= !!val
;
3612 case PACKET_ORIGDEV
:
3616 if (optlen
< sizeof(val
))
3618 if (copy_from_user(&val
, optval
, sizeof(val
)))
3621 po
->origdev
= !!val
;
3624 case PACKET_VNET_HDR
:
3628 if (sock
->type
!= SOCK_RAW
)
3630 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3632 if (optlen
< sizeof(val
))
3634 if (copy_from_user(&val
, optval
, sizeof(val
)))
3637 po
->has_vnet_hdr
= !!val
;
3640 case PACKET_TIMESTAMP
:
3644 if (optlen
!= sizeof(val
))
3646 if (copy_from_user(&val
, optval
, sizeof(val
)))
3649 po
->tp_tstamp
= val
;
3656 if (optlen
!= sizeof(val
))
3658 if (copy_from_user(&val
, optval
, sizeof(val
)))
3661 return fanout_add(sk
, val
& 0xffff, val
>> 16);
3663 case PACKET_FANOUT_DATA
:
3668 return fanout_set_data(po
, optval
, optlen
);
3670 case PACKET_TX_HAS_OFF
:
3674 if (optlen
!= sizeof(val
))
3676 if (po
->rx_ring
.pg_vec
|| po
->tx_ring
.pg_vec
)
3678 if (copy_from_user(&val
, optval
, sizeof(val
)))
3680 po
->tp_tx_has_off
= !!val
;
3683 case PACKET_QDISC_BYPASS
:
3687 if (optlen
!= sizeof(val
))
3689 if (copy_from_user(&val
, optval
, sizeof(val
)))
3692 po
->xmit
= val
? packet_direct_xmit
: dev_queue_xmit
;
3696 return -ENOPROTOOPT
;
3700 static int packet_getsockopt(struct socket
*sock
, int level
, int optname
,
3701 char __user
*optval
, int __user
*optlen
)
3704 int val
, lv
= sizeof(val
);
3705 struct sock
*sk
= sock
->sk
;
3706 struct packet_sock
*po
= pkt_sk(sk
);
3708 union tpacket_stats_u st
;
3709 struct tpacket_rollover_stats rstats
;
3711 if (level
!= SOL_PACKET
)
3712 return -ENOPROTOOPT
;
3714 if (get_user(len
, optlen
))
3721 case PACKET_STATISTICS
:
3722 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3723 memcpy(&st
, &po
->stats
, sizeof(st
));
3724 memset(&po
->stats
, 0, sizeof(po
->stats
));
3725 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3727 if (po
->tp_version
== TPACKET_V3
) {
3728 lv
= sizeof(struct tpacket_stats_v3
);
3729 st
.stats3
.tp_packets
+= st
.stats3
.tp_drops
;
3732 lv
= sizeof(struct tpacket_stats
);
3733 st
.stats1
.tp_packets
+= st
.stats1
.tp_drops
;
3738 case PACKET_AUXDATA
:
3741 case PACKET_ORIGDEV
:
3744 case PACKET_VNET_HDR
:
3745 val
= po
->has_vnet_hdr
;
3747 case PACKET_VERSION
:
3748 val
= po
->tp_version
;
3751 if (len
> sizeof(int))
3753 if (copy_from_user(&val
, optval
, len
))
3757 val
= sizeof(struct tpacket_hdr
);
3760 val
= sizeof(struct tpacket2_hdr
);
3763 val
= sizeof(struct tpacket3_hdr
);
3769 case PACKET_RESERVE
:
3770 val
= po
->tp_reserve
;
3775 case PACKET_TIMESTAMP
:
3776 val
= po
->tp_tstamp
;
3780 ((u32
)po
->fanout
->id
|
3781 ((u32
)po
->fanout
->type
<< 16) |
3782 ((u32
)po
->fanout
->flags
<< 24)) :
3785 case PACKET_ROLLOVER_STATS
:
3788 rstats
.tp_all
= atomic_long_read(&po
->rollover
->num
);
3789 rstats
.tp_huge
= atomic_long_read(&po
->rollover
->num_huge
);
3790 rstats
.tp_failed
= atomic_long_read(&po
->rollover
->num_failed
);
3792 lv
= sizeof(rstats
);
3794 case PACKET_TX_HAS_OFF
:
3795 val
= po
->tp_tx_has_off
;
3797 case PACKET_QDISC_BYPASS
:
3798 val
= packet_use_direct_xmit(po
);
3801 return -ENOPROTOOPT
;
3806 if (put_user(len
, optlen
))
3808 if (copy_to_user(optval
, data
, len
))
3814 static int packet_notifier(struct notifier_block
*this,
3815 unsigned long msg
, void *ptr
)
3818 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
3819 struct net
*net
= dev_net(dev
);
3822 sk_for_each_rcu(sk
, &net
->packet
.sklist
) {
3823 struct packet_sock
*po
= pkt_sk(sk
);
3826 case NETDEV_UNREGISTER
:
3828 packet_dev_mclist_delete(dev
, &po
->mclist
);
3832 if (dev
->ifindex
== po
->ifindex
) {
3833 spin_lock(&po
->bind_lock
);
3835 __unregister_prot_hook(sk
, false);
3836 sk
->sk_err
= ENETDOWN
;
3837 if (!sock_flag(sk
, SOCK_DEAD
))
3838 sk
->sk_error_report(sk
);
3840 if (msg
== NETDEV_UNREGISTER
) {
3841 packet_cached_dev_reset(po
);
3843 if (po
->prot_hook
.dev
)
3844 dev_put(po
->prot_hook
.dev
);
3845 po
->prot_hook
.dev
= NULL
;
3847 spin_unlock(&po
->bind_lock
);
3851 if (dev
->ifindex
== po
->ifindex
) {
3852 spin_lock(&po
->bind_lock
);
3854 register_prot_hook(sk
);
3855 spin_unlock(&po
->bind_lock
);
3865 static int packet_ioctl(struct socket
*sock
, unsigned int cmd
,
3868 struct sock
*sk
= sock
->sk
;
3873 int amount
= sk_wmem_alloc_get(sk
);
3875 return put_user(amount
, (int __user
*)arg
);
3879 struct sk_buff
*skb
;
3882 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3883 skb
= skb_peek(&sk
->sk_receive_queue
);
3886 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3887 return put_user(amount
, (int __user
*)arg
);
3890 return sock_get_timestamp(sk
, (struct timeval __user
*)arg
);
3892 return sock_get_timestampns(sk
, (struct timespec __user
*)arg
);
3902 case SIOCGIFBRDADDR
:
3903 case SIOCSIFBRDADDR
:
3904 case SIOCGIFNETMASK
:
3905 case SIOCSIFNETMASK
:
3906 case SIOCGIFDSTADDR
:
3907 case SIOCSIFDSTADDR
:
3909 return inet_dgram_ops
.ioctl(sock
, cmd
, arg
);
3913 return -ENOIOCTLCMD
;
3918 static unsigned int packet_poll(struct file
*file
, struct socket
*sock
,
3921 struct sock
*sk
= sock
->sk
;
3922 struct packet_sock
*po
= pkt_sk(sk
);
3923 unsigned int mask
= datagram_poll(file
, sock
, wait
);
3925 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
3926 if (po
->rx_ring
.pg_vec
) {
3927 if (!packet_previous_rx_frame(po
, &po
->rx_ring
,
3929 mask
|= POLLIN
| POLLRDNORM
;
3931 if (po
->pressure
&& __packet_rcv_has_room(po
, NULL
) == ROOM_NORMAL
)
3933 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
3934 spin_lock_bh(&sk
->sk_write_queue
.lock
);
3935 if (po
->tx_ring
.pg_vec
) {
3936 if (packet_current_frame(po
, &po
->tx_ring
, TP_STATUS_AVAILABLE
))
3937 mask
|= POLLOUT
| POLLWRNORM
;
3939 spin_unlock_bh(&sk
->sk_write_queue
.lock
);
3944 /* Dirty? Well, I still did not learn better way to account
3948 static void packet_mm_open(struct vm_area_struct
*vma
)
3950 struct file
*file
= vma
->vm_file
;
3951 struct socket
*sock
= file
->private_data
;
3952 struct sock
*sk
= sock
->sk
;
3955 atomic_inc(&pkt_sk(sk
)->mapped
);
3958 static void packet_mm_close(struct vm_area_struct
*vma
)
3960 struct file
*file
= vma
->vm_file
;
3961 struct socket
*sock
= file
->private_data
;
3962 struct sock
*sk
= sock
->sk
;
3965 atomic_dec(&pkt_sk(sk
)->mapped
);
3968 static const struct vm_operations_struct packet_mmap_ops
= {
3969 .open
= packet_mm_open
,
3970 .close
= packet_mm_close
,
3973 static void free_pg_vec(struct pgv
*pg_vec
, unsigned int order
,
3978 for (i
= 0; i
< len
; i
++) {
3979 if (likely(pg_vec
[i
].buffer
)) {
3980 if (is_vmalloc_addr(pg_vec
[i
].buffer
))
3981 vfree(pg_vec
[i
].buffer
);
3983 free_pages((unsigned long)pg_vec
[i
].buffer
,
3985 pg_vec
[i
].buffer
= NULL
;
3991 static char *alloc_one_pg_vec_page(unsigned long order
)
3994 gfp_t gfp_flags
= GFP_KERNEL
| __GFP_COMP
|
3995 __GFP_ZERO
| __GFP_NOWARN
| __GFP_NORETRY
;
3997 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
4001 /* __get_free_pages failed, fall back to vmalloc */
4002 buffer
= vzalloc((1 << order
) * PAGE_SIZE
);
4006 /* vmalloc failed, lets dig into swap here */
4007 gfp_flags
&= ~__GFP_NORETRY
;
4008 buffer
= (char *) __get_free_pages(gfp_flags
, order
);
4012 /* complete and utter failure */
4016 static struct pgv
*alloc_pg_vec(struct tpacket_req
*req
, int order
)
4018 unsigned int block_nr
= req
->tp_block_nr
;
4022 pg_vec
= kcalloc(block_nr
, sizeof(struct pgv
), GFP_KERNEL
);
4023 if (unlikely(!pg_vec
))
4026 for (i
= 0; i
< block_nr
; i
++) {
4027 pg_vec
[i
].buffer
= alloc_one_pg_vec_page(order
);
4028 if (unlikely(!pg_vec
[i
].buffer
))
4029 goto out_free_pgvec
;
4036 free_pg_vec(pg_vec
, order
, block_nr
);
4041 static int packet_set_ring(struct sock
*sk
, union tpacket_req_u
*req_u
,
4042 int closing
, int tx_ring
)
4044 struct pgv
*pg_vec
= NULL
;
4045 struct packet_sock
*po
= pkt_sk(sk
);
4046 int was_running
, order
= 0;
4047 struct packet_ring_buffer
*rb
;
4048 struct sk_buff_head
*rb_queue
;
4051 /* Added to avoid minimal code churn */
4052 struct tpacket_req
*req
= &req_u
->req
;
4054 /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
4055 if (!closing
&& tx_ring
&& (po
->tp_version
> TPACKET_V2
)) {
4056 WARN(1, "Tx-ring is not supported.\n");
4060 rb
= tx_ring
? &po
->tx_ring
: &po
->rx_ring
;
4061 rb_queue
= tx_ring
? &sk
->sk_write_queue
: &sk
->sk_receive_queue
;
4065 if (atomic_read(&po
->mapped
))
4067 if (packet_read_pending(rb
))
4071 if (req
->tp_block_nr
) {
4072 /* Sanity tests and some calculations */
4074 if (unlikely(rb
->pg_vec
))
4077 switch (po
->tp_version
) {
4079 po
->tp_hdrlen
= TPACKET_HDRLEN
;
4082 po
->tp_hdrlen
= TPACKET2_HDRLEN
;
4085 po
->tp_hdrlen
= TPACKET3_HDRLEN
;
4090 if (unlikely((int)req
->tp_block_size
<= 0))
4092 if (unlikely(req
->tp_block_size
& (PAGE_SIZE
- 1)))
4094 if (po
->tp_version
>= TPACKET_V3
&&
4095 (int)(req
->tp_block_size
-
4096 BLK_PLUS_PRIV(req_u
->req3
.tp_sizeof_priv
)) <= 0)
4098 if (unlikely(req
->tp_frame_size
< po
->tp_hdrlen
+
4101 if (unlikely(req
->tp_frame_size
& (TPACKET_ALIGNMENT
- 1)))
4104 rb
->frames_per_block
= req
->tp_block_size
/req
->tp_frame_size
;
4105 if (unlikely(rb
->frames_per_block
<= 0))
4107 if (unlikely((rb
->frames_per_block
* req
->tp_block_nr
) !=
4112 order
= get_order(req
->tp_block_size
);
4113 pg_vec
= alloc_pg_vec(req
, order
);
4114 if (unlikely(!pg_vec
))
4116 switch (po
->tp_version
) {
4118 /* Transmit path is not supported. We checked
4119 * it above but just being paranoid
4122 init_prb_bdqc(po
, rb
, pg_vec
, req_u
);
4131 if (unlikely(req
->tp_frame_nr
))
4137 /* Detach socket from network */
4138 spin_lock(&po
->bind_lock
);
4139 was_running
= po
->running
;
4143 __unregister_prot_hook(sk
, false);
4145 spin_unlock(&po
->bind_lock
);
4150 mutex_lock(&po
->pg_vec_lock
);
4151 if (closing
|| atomic_read(&po
->mapped
) == 0) {
4153 spin_lock_bh(&rb_queue
->lock
);
4154 swap(rb
->pg_vec
, pg_vec
);
4155 rb
->frame_max
= (req
->tp_frame_nr
- 1);
4157 rb
->frame_size
= req
->tp_frame_size
;
4158 spin_unlock_bh(&rb_queue
->lock
);
4160 swap(rb
->pg_vec_order
, order
);
4161 swap(rb
->pg_vec_len
, req
->tp_block_nr
);
4163 rb
->pg_vec_pages
= req
->tp_block_size
/PAGE_SIZE
;
4164 po
->prot_hook
.func
= (po
->rx_ring
.pg_vec
) ?
4165 tpacket_rcv
: packet_rcv
;
4166 skb_queue_purge(rb_queue
);
4167 if (atomic_read(&po
->mapped
))
4168 pr_err("packet_mmap: vma is busy: %d\n",
4169 atomic_read(&po
->mapped
));
4171 mutex_unlock(&po
->pg_vec_lock
);
4173 spin_lock(&po
->bind_lock
);
4176 register_prot_hook(sk
);
4178 spin_unlock(&po
->bind_lock
);
4179 if (closing
&& (po
->tp_version
> TPACKET_V2
)) {
4180 /* Because we don't support block-based V3 on tx-ring */
4182 prb_shutdown_retire_blk_timer(po
, rb_queue
);
4187 free_pg_vec(pg_vec
, order
, req
->tp_block_nr
);
4192 static int packet_mmap(struct file
*file
, struct socket
*sock
,
4193 struct vm_area_struct
*vma
)
4195 struct sock
*sk
= sock
->sk
;
4196 struct packet_sock
*po
= pkt_sk(sk
);
4197 unsigned long size
, expected_size
;
4198 struct packet_ring_buffer
*rb
;
4199 unsigned long start
;
4206 mutex_lock(&po
->pg_vec_lock
);
4209 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
4211 expected_size
+= rb
->pg_vec_len
4217 if (expected_size
== 0)
4220 size
= vma
->vm_end
- vma
->vm_start
;
4221 if (size
!= expected_size
)
4224 start
= vma
->vm_start
;
4225 for (rb
= &po
->rx_ring
; rb
<= &po
->tx_ring
; rb
++) {
4226 if (rb
->pg_vec
== NULL
)
4229 for (i
= 0; i
< rb
->pg_vec_len
; i
++) {
4231 void *kaddr
= rb
->pg_vec
[i
].buffer
;
4234 for (pg_num
= 0; pg_num
< rb
->pg_vec_pages
; pg_num
++) {
4235 page
= pgv_to_page(kaddr
);
4236 err
= vm_insert_page(vma
, start
, page
);
4245 atomic_inc(&po
->mapped
);
4246 vma
->vm_ops
= &packet_mmap_ops
;
4250 mutex_unlock(&po
->pg_vec_lock
);
4254 static const struct proto_ops packet_ops_spkt
= {
4255 .family
= PF_PACKET
,
4256 .owner
= THIS_MODULE
,
4257 .release
= packet_release
,
4258 .bind
= packet_bind_spkt
,
4259 .connect
= sock_no_connect
,
4260 .socketpair
= sock_no_socketpair
,
4261 .accept
= sock_no_accept
,
4262 .getname
= packet_getname_spkt
,
4263 .poll
= datagram_poll
,
4264 .ioctl
= packet_ioctl
,
4265 .listen
= sock_no_listen
,
4266 .shutdown
= sock_no_shutdown
,
4267 .setsockopt
= sock_no_setsockopt
,
4268 .getsockopt
= sock_no_getsockopt
,
4269 .sendmsg
= packet_sendmsg_spkt
,
4270 .recvmsg
= packet_recvmsg
,
4271 .mmap
= sock_no_mmap
,
4272 .sendpage
= sock_no_sendpage
,
4275 static const struct proto_ops packet_ops
= {
4276 .family
= PF_PACKET
,
4277 .owner
= THIS_MODULE
,
4278 .release
= packet_release
,
4279 .bind
= packet_bind
,
4280 .connect
= sock_no_connect
,
4281 .socketpair
= sock_no_socketpair
,
4282 .accept
= sock_no_accept
,
4283 .getname
= packet_getname
,
4284 .poll
= packet_poll
,
4285 .ioctl
= packet_ioctl
,
4286 .listen
= sock_no_listen
,
4287 .shutdown
= sock_no_shutdown
,
4288 .setsockopt
= packet_setsockopt
,
4289 .getsockopt
= packet_getsockopt
,
4290 .sendmsg
= packet_sendmsg
,
4291 .recvmsg
= packet_recvmsg
,
4292 .mmap
= packet_mmap
,
4293 .sendpage
= sock_no_sendpage
,
4296 static const struct net_proto_family packet_family_ops
= {
4297 .family
= PF_PACKET
,
4298 .create
= packet_create
,
4299 .owner
= THIS_MODULE
,
4302 static struct notifier_block packet_netdev_notifier
= {
4303 .notifier_call
= packet_notifier
,
4306 #ifdef CONFIG_PROC_FS
4308 static void *packet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4311 struct net
*net
= seq_file_net(seq
);
4314 return seq_hlist_start_head_rcu(&net
->packet
.sklist
, *pos
);
4317 static void *packet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4319 struct net
*net
= seq_file_net(seq
);
4320 return seq_hlist_next_rcu(v
, &net
->packet
.sklist
, pos
);
4323 static void packet_seq_stop(struct seq_file
*seq
, void *v
)
4329 static int packet_seq_show(struct seq_file
*seq
, void *v
)
4331 if (v
== SEQ_START_TOKEN
)
4332 seq_puts(seq
, "sk RefCnt Type Proto Iface R Rmem User Inode\n");
4334 struct sock
*s
= sk_entry(v
);
4335 const struct packet_sock
*po
= pkt_sk(s
);
4338 "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n",
4340 atomic_read(&s
->sk_refcnt
),
4345 atomic_read(&s
->sk_rmem_alloc
),
4346 from_kuid_munged(seq_user_ns(seq
), sock_i_uid(s
)),
4353 static const struct seq_operations packet_seq_ops
= {
4354 .start
= packet_seq_start
,
4355 .next
= packet_seq_next
,
4356 .stop
= packet_seq_stop
,
4357 .show
= packet_seq_show
,
4360 static int packet_seq_open(struct inode
*inode
, struct file
*file
)
4362 return seq_open_net(inode
, file
, &packet_seq_ops
,
4363 sizeof(struct seq_net_private
));
4366 static const struct file_operations packet_seq_fops
= {
4367 .owner
= THIS_MODULE
,
4368 .open
= packet_seq_open
,
4370 .llseek
= seq_lseek
,
4371 .release
= seq_release_net
,
4376 static int __net_init
packet_net_init(struct net
*net
)
4378 mutex_init(&net
->packet
.sklist_lock
);
4379 INIT_HLIST_HEAD(&net
->packet
.sklist
);
4381 if (!proc_create("packet", 0, net
->proc_net
, &packet_seq_fops
))
4387 static void __net_exit
packet_net_exit(struct net
*net
)
4389 remove_proc_entry("packet", net
->proc_net
);
4392 static struct pernet_operations packet_net_ops
= {
4393 .init
= packet_net_init
,
4394 .exit
= packet_net_exit
,
4398 static void __exit
packet_exit(void)
4400 unregister_netdevice_notifier(&packet_netdev_notifier
);
4401 unregister_pernet_subsys(&packet_net_ops
);
4402 sock_unregister(PF_PACKET
);
4403 proto_unregister(&packet_proto
);
4406 static int __init
packet_init(void)
4408 int rc
= proto_register(&packet_proto
, 0);
4413 sock_register(&packet_family_ops
);
4414 register_pernet_subsys(&packet_net_ops
);
4415 register_netdevice_notifier(&packet_netdev_notifier
);
4420 module_init(packet_init
);
4421 module_exit(packet_exit
);
4422 MODULE_LICENSE("GPL");
4423 MODULE_ALIAS_NETPROTO(PF_PACKET
);