2 * Definitions for the 'struct sk_buff' memory handlers.
5 * Alan Cox, <gw4pts@gw4pts.ampr.org>
6 * Florian La Roche, <rzsfl@rz.uni-sb.de>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
14 #ifndef _LINUX_SKBUFF_H
15 #define _LINUX_SKBUFF_H
17 #include <linux/kernel.h>
18 #include <linux/compiler.h>
19 #include <linux/time.h>
20 #include <linux/cache.h>
22 #include <asm/atomic.h>
23 #include <asm/types.h>
24 #include <linux/spinlock.h>
25 #include <linux/net.h>
26 #include <linux/textsearch.h>
27 #include <net/checksum.h>
28 #include <linux/rcupdate.h>
29 #include <linux/dmaengine.h>
30 #include <linux/hrtimer.h>
32 #define HAVE_ALLOC_SKB /* For the drivers to know */
33 #define HAVE_ALIGNABLE_SKB /* Ditto 8) */
35 /* Don't change this without changing skb_csum_unnecessary! */
36 #define CHECKSUM_NONE 0
37 #define CHECKSUM_UNNECESSARY 1
38 #define CHECKSUM_COMPLETE 2
39 #define CHECKSUM_PARTIAL 3
41 #define SKB_DATA_ALIGN(X) (((X) + (SMP_CACHE_BYTES - 1)) & \
42 ~(SMP_CACHE_BYTES - 1))
43 #define SKB_WITH_OVERHEAD(X) \
44 (((X) - sizeof(struct skb_shared_info)) & \
45 ~(SMP_CACHE_BYTES - 1))
46 #define SKB_MAX_ORDER(X, ORDER) \
47 SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X))
48 #define SKB_MAX_HEAD(X) (SKB_MAX_ORDER((X), 0))
49 #define SKB_MAX_ALLOC (SKB_MAX_ORDER(0, 2))
51 /* A. Checksumming of received packets by device.
53 * NONE: device failed to checksum this packet.
54 * skb->csum is undefined.
56 * UNNECESSARY: device parsed packet and wouldbe verified checksum.
57 * skb->csum is undefined.
58 * It is bad option, but, unfortunately, many of vendors do this.
59 * Apparently with secret goal to sell you new device, when you
60 * will add new protocol to your host. F.e. IPv6. 8)
62 * COMPLETE: the most generic way. Device supplied checksum of _all_
63 * the packet as seen by netif_rx in skb->csum.
64 * NOTE: Even if device supports only some protocols, but
65 * is able to produce some skb->csum, it MUST use COMPLETE,
68 * B. Checksumming on output.
70 * NONE: skb is checksummed by protocol or csum is not required.
72 * PARTIAL: device is required to csum packet as seen by hard_start_xmit
73 * from skb->transport_header to the end and to record the checksum
74 * at skb->transport_header + skb->csum.
76 * Device must show its capabilities in dev->features, set
77 * at device setup time.
78 * NETIF_F_HW_CSUM - it is clever device, it is able to checksum
80 * NETIF_F_NO_CSUM - loopback or reliable single hop media.
81 * NETIF_F_IP_CSUM - device is dumb. It is able to csum only
82 * TCP/UDP over IPv4. Sigh. Vendors like this
83 * way by an unknown reason. Though, see comment above
84 * about CHECKSUM_UNNECESSARY. 8)
86 * Any questions? No questions, good. --ANK
92 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
98 #ifdef CONFIG_BRIDGE_NETFILTER
99 struct nf_bridge_info
{
101 struct net_device
*physindev
;
102 struct net_device
*physoutdev
;
103 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
104 struct net_device
*netoutdev
;
107 unsigned long data
[32 / sizeof(unsigned long)];
111 struct sk_buff_head
{
112 /* These two members must be first. */
113 struct sk_buff
*next
;
114 struct sk_buff
*prev
;
122 /* To allow 64K frame to be packed as single skb without frag_list */
123 #define MAX_SKB_FRAGS (65536/PAGE_SIZE + 2)
125 typedef struct skb_frag_struct skb_frag_t
;
127 struct skb_frag_struct
{
133 /* This data is invariant across clones and lives at
134 * the end of the header data, ie. at skb->end.
136 struct skb_shared_info
{
138 unsigned short nr_frags
;
139 unsigned short gso_size
;
140 /* Warning: this field is not always filled in (UFO)! */
141 unsigned short gso_segs
;
142 unsigned short gso_type
;
144 struct sk_buff
*frag_list
;
145 skb_frag_t frags
[MAX_SKB_FRAGS
];
148 /* We divide dataref into two halves. The higher 16 bits hold references
149 * to the payload part of skb->data. The lower 16 bits hold references to
150 * the entire skb->data. A clone of a headerless skb holds the length of
151 * the header in skb->hdr_len.
153 * All users must obey the rule that the skb->data reference count must be
154 * greater than or equal to the payload reference count.
156 * Holding a reference to the payload part means that the user does not
157 * care about modifications to the header part of skb->data.
159 #define SKB_DATAREF_SHIFT 16
160 #define SKB_DATAREF_MASK ((1 << SKB_DATAREF_SHIFT) - 1)
164 SKB_FCLONE_UNAVAILABLE
,
170 SKB_GSO_TCPV4
= 1 << 0,
171 SKB_GSO_UDP
= 1 << 1,
173 /* This indicates the skb is from an untrusted source. */
174 SKB_GSO_DODGY
= 1 << 2,
176 /* This indicates the tcp segment has CWR set. */
177 SKB_GSO_TCP_ECN
= 1 << 3,
179 SKB_GSO_TCPV6
= 1 << 4,
182 #if BITS_PER_LONG > 32
183 #define NET_SKBUFF_DATA_USES_OFFSET 1
186 #ifdef NET_SKBUFF_DATA_USES_OFFSET
187 typedef unsigned int sk_buff_data_t
;
189 typedef unsigned char *sk_buff_data_t
;
193 * struct sk_buff - socket buffer
194 * @next: Next buffer in list
195 * @prev: Previous buffer in list
196 * @sk: Socket we are owned by
197 * @tstamp: Time we arrived
198 * @dev: Device we arrived on/are leaving by
199 * @iif: ifindex of device we arrived on
200 * @transport_header: Transport layer header
201 * @network_header: Network layer header
202 * @mac_header: Link layer header
203 * @dst: destination entry
204 * @sp: the security path, used for xfrm
205 * @cb: Control buffer. Free for use by every layer. Put private vars here
206 * @len: Length of actual data
207 * @data_len: Data length
208 * @mac_len: Length of link layer header
209 * @hdr_len: writable header length of cloned skb
210 * @csum: Checksum (must include start/offset pair)
211 * @csum_start: Offset from skb->head where checksumming should start
212 * @csum_offset: Offset from csum_start where checksum should be stored
213 * @local_df: allow local fragmentation
214 * @cloned: Head may be cloned (check refcnt to be sure)
215 * @nohdr: Payload reference only, must not modify header
216 * @pkt_type: Packet class
217 * @fclone: skbuff clone status
218 * @ip_summed: Driver fed us an IP checksum
219 * @priority: Packet queueing priority
220 * @users: User count - see {datagram,tcp}.c
221 * @protocol: Packet protocol from driver
222 * @truesize: Buffer size
223 * @head: Head of buffer
224 * @data: Data head pointer
225 * @tail: Tail pointer
227 * @destructor: Destruct function
228 * @mark: Generic packet mark
229 * @nfct: Associated connection, if any
230 * @ipvs_property: skbuff is owned by ipvs
231 * @nfctinfo: Relationship of this skb to the connection
232 * @nfct_reasm: netfilter conntrack re-assembly pointer
233 * @nf_bridge: Saved data about a bridged frame - see br_netfilter.c
234 * @tc_index: Traffic control index
235 * @tc_verd: traffic control verdict
236 * @dma_cookie: a cookie to one of several possible DMA operations
237 * done by skb DMA functions
238 * @secmark: security marking
242 /* These two members must be first. */
243 struct sk_buff
*next
;
244 struct sk_buff
*prev
;
248 struct net_device
*dev
;
250 /* 4 byte hole on 64 bit*/
252 struct dst_entry
*dst
;
256 * This is the control buffer. It is free to use for every
257 * layer. Please put your private variables there. If you
258 * want to keep them across layers you have to do a skb_clone()
259 * first. This is owned by whoever has the skb queued ATM.
285 void (*destructor
)(struct sk_buff
*skb
);
289 sk_buff_data_t transport_header
;
290 sk_buff_data_t network_header
;
291 sk_buff_data_t mac_header
;
296 unsigned int truesize
;
298 unsigned char wl_idx
;
299 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
300 struct nf_conntrack
*nfct
;
301 struct sk_buff
*nfct_reasm
;
305 #ifdef CONFIG_BRIDGE_NETFILTER
306 struct nf_bridge_info
*nf_bridge
;
308 #ifdef CONFIG_NET_SCHED
309 __u16 tc_index
; /* traffic control index */
310 #ifdef CONFIG_NET_CLS_ACT
311 __u16 tc_verd
; /* traffic control verdict */
314 #ifdef CONFIG_NET_DMA
315 dma_cookie_t dma_cookie
;
317 #ifdef CONFIG_NETWORK_SECMARK
320 #if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
321 unsigned char imq_flags
;
322 struct nf_info
*nf_info
;
324 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
332 * Handling routines are only of interest to the kernel
334 #include <linux/slab.h>
336 #include <asm/system.h>
338 extern void kfree_skb(struct sk_buff
*skb
);
339 extern void __kfree_skb(struct sk_buff
*skb
);
340 extern struct sk_buff
*__alloc_skb(unsigned int size
,
341 gfp_t priority
, int fclone
, int node
);
342 static inline struct sk_buff
*alloc_skb(unsigned int size
,
345 return __alloc_skb(size
, priority
, 0, -1);
348 static inline struct sk_buff
*alloc_skb_fclone(unsigned int size
,
351 return __alloc_skb(size
, priority
, 1, -1);
354 extern void kfree_skbmem(struct sk_buff
*skb
);
355 extern struct sk_buff
*skb_clone(struct sk_buff
*skb
,
357 extern struct sk_buff
*skb_copy(const struct sk_buff
*skb
,
359 extern struct sk_buff
*pskb_copy(struct sk_buff
*skb
,
361 extern int pskb_expand_head(struct sk_buff
*skb
,
362 int nhead
, int ntail
,
364 extern struct sk_buff
*skb_realloc_headroom(struct sk_buff
*skb
,
365 unsigned int headroom
);
366 extern struct sk_buff
*skb_copy_expand(const struct sk_buff
*skb
,
367 int newheadroom
, int newtailroom
,
369 extern int skb_to_sgvec(struct sk_buff
*skb
,
370 struct scatterlist
*sg
, int offset
,
372 extern int skb_cow_data(struct sk_buff
*skb
, int tailbits
,
373 struct sk_buff
**trailer
);
374 extern int skb_pad(struct sk_buff
*skb
, int pad
);
375 #define dev_kfree_skb(a) kfree_skb(a)
376 extern void skb_over_panic(struct sk_buff
*skb
, int len
,
378 extern void skb_under_panic(struct sk_buff
*skb
, int len
,
380 extern void skb_truesize_bug(struct sk_buff
*skb
);
382 static inline void skb_truesize_check(struct sk_buff
*skb
)
384 if (unlikely((int)skb
->truesize
< sizeof(struct sk_buff
) + skb
->len
))
385 skb_truesize_bug(skb
);
388 extern int skb_append_datato_frags(struct sock
*sk
, struct sk_buff
*skb
,
389 int getfrag(void *from
, char *to
, int offset
,
390 int len
,int odd
, struct sk_buff
*skb
),
391 void *from
, int length
);
398 __u32 stepped_offset
;
399 struct sk_buff
*root_skb
;
400 struct sk_buff
*cur_skb
;
404 extern void skb_prepare_seq_read(struct sk_buff
*skb
,
405 unsigned int from
, unsigned int to
,
406 struct skb_seq_state
*st
);
407 extern unsigned int skb_seq_read(unsigned int consumed
, const u8
**data
,
408 struct skb_seq_state
*st
);
409 extern void skb_abort_seq_read(struct skb_seq_state
*st
);
411 extern unsigned int skb_find_text(struct sk_buff
*skb
, unsigned int from
,
412 unsigned int to
, struct ts_config
*config
,
413 struct ts_state
*state
);
415 #ifdef NET_SKBUFF_DATA_USES_OFFSET
416 static inline unsigned char *skb_end_pointer(const struct sk_buff
*skb
)
418 return skb
->head
+ skb
->end
;
421 static inline unsigned char *skb_end_pointer(const struct sk_buff
*skb
)
428 #define skb_shinfo(SKB) ((struct skb_shared_info *)(skb_end_pointer(SKB)))
431 * skb_queue_empty - check if a queue is empty
434 * Returns true if the queue is empty, false otherwise.
436 static inline int skb_queue_empty(const struct sk_buff_head
*list
)
438 return list
->next
== (struct sk_buff
*)list
;
442 * skb_get - reference buffer
443 * @skb: buffer to reference
445 * Makes another reference to a socket buffer and returns a pointer
448 static inline struct sk_buff
*skb_get(struct sk_buff
*skb
)
450 atomic_inc(&skb
->users
);
455 * If users == 1, we are the only owner and are can avoid redundant
460 * skb_cloned - is the buffer a clone
461 * @skb: buffer to check
463 * Returns true if the buffer was generated with skb_clone() and is
464 * one of multiple shared copies of the buffer. Cloned buffers are
465 * shared data so must not be written to under normal circumstances.
467 static inline int skb_cloned(const struct sk_buff
*skb
)
469 return skb
->cloned
&&
470 (atomic_read(&skb_shinfo(skb
)->dataref
) & SKB_DATAREF_MASK
) != 1;
474 * skb_header_cloned - is the header a clone
475 * @skb: buffer to check
477 * Returns true if modifying the header part of the buffer requires
478 * the data to be copied.
480 static inline int skb_header_cloned(const struct sk_buff
*skb
)
487 dataref
= atomic_read(&skb_shinfo(skb
)->dataref
);
488 dataref
= (dataref
& SKB_DATAREF_MASK
) - (dataref
>> SKB_DATAREF_SHIFT
);
493 * skb_header_release - release reference to header
494 * @skb: buffer to operate on
496 * Drop a reference to the header part of the buffer. This is done
497 * by acquiring a payload reference. You must not read from the header
498 * part of skb->data after this.
500 static inline void skb_header_release(struct sk_buff
*skb
)
504 atomic_add(1 << SKB_DATAREF_SHIFT
, &skb_shinfo(skb
)->dataref
);
508 * skb_shared - is the buffer shared
509 * @skb: buffer to check
511 * Returns true if more than one person has a reference to this
514 static inline int skb_shared(const struct sk_buff
*skb
)
516 return atomic_read(&skb
->users
) != 1;
520 * skb_share_check - check if buffer is shared and if so clone it
521 * @skb: buffer to check
522 * @pri: priority for memory allocation
524 * If the buffer is shared the buffer is cloned and the old copy
525 * drops a reference. A new clone with a single reference is returned.
526 * If the buffer is not shared the original buffer is returned. When
527 * being called from interrupt status or with spinlocks held pri must
530 * NULL is returned on a memory allocation failure.
532 static inline struct sk_buff
*skb_share_check(struct sk_buff
*skb
,
535 might_sleep_if(pri
& __GFP_WAIT
);
536 if (skb_shared(skb
)) {
537 struct sk_buff
*nskb
= skb_clone(skb
, pri
);
545 * Copy shared buffers into a new sk_buff. We effectively do COW on
546 * packets to handle cases where we have a local reader and forward
547 * and a couple of other messy ones. The normal one is tcpdumping
548 * a packet thats being forwarded.
552 * skb_unshare - make a copy of a shared buffer
553 * @skb: buffer to check
554 * @pri: priority for memory allocation
556 * If the socket buffer is a clone then this function creates a new
557 * copy of the data, drops a reference count on the old copy and returns
558 * the new copy with the reference count at 1. If the buffer is not a clone
559 * the original buffer is returned. When called with a spinlock held or
560 * from interrupt state @pri must be %GFP_ATOMIC
562 * %NULL is returned on a memory allocation failure.
564 static inline struct sk_buff
*skb_unshare(struct sk_buff
*skb
,
567 might_sleep_if(pri
& __GFP_WAIT
);
568 if (skb_cloned(skb
)) {
569 struct sk_buff
*nskb
= skb_copy(skb
, pri
);
570 kfree_skb(skb
); /* Free our shared copy */
578 * @list_: list to peek at
580 * Peek an &sk_buff. Unlike most other operations you _MUST_
581 * be careful with this one. A peek leaves the buffer on the
582 * list and someone else may run off with it. You must hold
583 * the appropriate locks or have a private queue to do this.
585 * Returns %NULL for an empty list or a pointer to the head element.
586 * The reference count is not incremented and the reference is therefore
587 * volatile. Use with caution.
589 static inline struct sk_buff
*skb_peek(struct sk_buff_head
*list_
)
591 struct sk_buff
*list
= ((struct sk_buff
*)list_
)->next
;
592 if (list
== (struct sk_buff
*)list_
)
599 * @list_: list to peek at
601 * Peek an &sk_buff. Unlike most other operations you _MUST_
602 * be careful with this one. A peek leaves the buffer on the
603 * list and someone else may run off with it. You must hold
604 * the appropriate locks or have a private queue to do this.
606 * Returns %NULL for an empty list or a pointer to the tail element.
607 * The reference count is not incremented and the reference is therefore
608 * volatile. Use with caution.
610 static inline struct sk_buff
*skb_peek_tail(struct sk_buff_head
*list_
)
612 struct sk_buff
*list
= ((struct sk_buff
*)list_
)->prev
;
613 if (list
== (struct sk_buff
*)list_
)
619 * skb_queue_len - get queue length
620 * @list_: list to measure
622 * Return the length of an &sk_buff queue.
624 static inline __u32
skb_queue_len(const struct sk_buff_head
*list_
)
630 * This function creates a split out lock class for each invocation;
631 * this is needed for now since a whole lot of users of the skb-queue
632 * infrastructure in drivers have different locking usage (in hardirq)
633 * than the networking core (in softirq only). In the long run either the
634 * network layer or drivers should need annotation to consolidate the
635 * main types of usage into 3 classes.
637 static inline void skb_queue_head_init(struct sk_buff_head
*list
)
639 spin_lock_init(&list
->lock
);
640 list
->prev
= list
->next
= (struct sk_buff
*)list
;
644 static inline void skb_queue_head_init_class(struct sk_buff_head
*list
,
645 struct lock_class_key
*class)
647 skb_queue_head_init(list
);
648 lockdep_set_class(&list
->lock
, class);
652 * Insert an sk_buff at the start of a list.
654 * The "__skb_xxxx()" functions are the non-atomic ones that
655 * can only be called with interrupts disabled.
659 * __skb_queue_after - queue a buffer at the list head
661 * @prev: place after this buffer
662 * @newsk: buffer to queue
664 * Queue a buffer int the middle of a list. This function takes no locks
665 * and you must therefore hold required locks before calling it.
667 * A buffer cannot be placed on two lists at the same time.
669 static inline void __skb_queue_after(struct sk_buff_head
*list
,
670 struct sk_buff
*prev
,
671 struct sk_buff
*newsk
)
673 struct sk_buff
*next
;
679 next
->prev
= prev
->next
= newsk
;
683 * __skb_queue_head - queue a buffer at the list head
685 * @newsk: buffer to queue
687 * Queue a buffer at the start of a list. This function takes no locks
688 * and you must therefore hold required locks before calling it.
690 * A buffer cannot be placed on two lists at the same time.
692 extern void skb_queue_head(struct sk_buff_head
*list
, struct sk_buff
*newsk
);
693 static inline void __skb_queue_head(struct sk_buff_head
*list
,
694 struct sk_buff
*newsk
)
696 __skb_queue_after(list
, (struct sk_buff
*)list
, newsk
);
700 * __skb_queue_tail - queue a buffer at the list tail
702 * @newsk: buffer to queue
704 * Queue a buffer at the end of a list. This function takes no locks
705 * and you must therefore hold required locks before calling it.
707 * A buffer cannot be placed on two lists at the same time.
709 extern void skb_queue_tail(struct sk_buff_head
*list
, struct sk_buff
*newsk
);
710 static inline void __skb_queue_tail(struct sk_buff_head
*list
,
711 struct sk_buff
*newsk
)
713 struct sk_buff
*prev
, *next
;
716 next
= (struct sk_buff
*)list
;
720 next
->prev
= prev
->next
= newsk
;
725 * __skb_dequeue - remove from the head of the queue
726 * @list: list to dequeue from
728 * Remove the head of the list. This function does not take any locks
729 * so must be used with appropriate locks held only. The head item is
730 * returned or %NULL if the list is empty.
732 extern struct sk_buff
*skb_dequeue(struct sk_buff_head
*list
);
733 static inline struct sk_buff
*__skb_dequeue(struct sk_buff_head
*list
)
735 struct sk_buff
*next
, *prev
, *result
;
737 prev
= (struct sk_buff
*) list
;
746 result
->next
= result
->prev
= NULL
;
753 * Insert a packet on a list.
755 extern void skb_insert(struct sk_buff
*old
, struct sk_buff
*newsk
, struct sk_buff_head
*list
);
756 static inline void __skb_insert(struct sk_buff
*newsk
,
757 struct sk_buff
*prev
, struct sk_buff
*next
,
758 struct sk_buff_head
*list
)
762 next
->prev
= prev
->next
= newsk
;
767 * Place a packet after a given packet in a list.
769 extern void skb_append(struct sk_buff
*old
, struct sk_buff
*newsk
, struct sk_buff_head
*list
);
770 static inline void __skb_append(struct sk_buff
*old
, struct sk_buff
*newsk
, struct sk_buff_head
*list
)
772 __skb_insert(newsk
, old
, old
->next
, list
);
776 * remove sk_buff from list. _Must_ be called atomically, and with
779 extern void skb_unlink(struct sk_buff
*skb
, struct sk_buff_head
*list
);
780 static inline void __skb_unlink(struct sk_buff
*skb
, struct sk_buff_head
*list
)
782 struct sk_buff
*next
, *prev
;
787 skb
->next
= skb
->prev
= NULL
;
793 /* XXX: more streamlined implementation */
796 * __skb_dequeue_tail - remove from the tail of the queue
797 * @list: list to dequeue from
799 * Remove the tail of the list. This function does not take any locks
800 * so must be used with appropriate locks held only. The tail item is
801 * returned or %NULL if the list is empty.
803 extern struct sk_buff
*skb_dequeue_tail(struct sk_buff_head
*list
);
804 static inline struct sk_buff
*__skb_dequeue_tail(struct sk_buff_head
*list
)
806 struct sk_buff
*skb
= skb_peek_tail(list
);
808 __skb_unlink(skb
, list
);
813 static inline int skb_is_nonlinear(const struct sk_buff
*skb
)
815 return skb
->data_len
;
818 static inline unsigned int skb_headlen(const struct sk_buff
*skb
)
820 return skb
->len
- skb
->data_len
;
823 static inline int skb_pagelen(const struct sk_buff
*skb
)
827 for (i
= (int)skb_shinfo(skb
)->nr_frags
- 1; i
>= 0; i
--)
828 len
+= skb_shinfo(skb
)->frags
[i
].size
;
829 return len
+ skb_headlen(skb
);
832 static inline void skb_fill_page_desc(struct sk_buff
*skb
, int i
,
833 struct page
*page
, int off
, int size
)
835 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
838 frag
->page_offset
= off
;
840 skb_shinfo(skb
)->nr_frags
= i
+ 1;
843 #define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags)
844 #define SKB_FRAG_ASSERT(skb) BUG_ON(skb_shinfo(skb)->frag_list)
845 #define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb))
847 #ifdef NET_SKBUFF_DATA_USES_OFFSET
848 static inline unsigned char *skb_tail_pointer(const struct sk_buff
*skb
)
850 return skb
->head
+ skb
->tail
;
853 static inline void skb_reset_tail_pointer(struct sk_buff
*skb
)
855 skb
->tail
= skb
->data
- skb
->head
;
858 static inline void skb_set_tail_pointer(struct sk_buff
*skb
, const int offset
)
860 skb_reset_tail_pointer(skb
);
863 #else /* NET_SKBUFF_DATA_USES_OFFSET */
864 static inline unsigned char *skb_tail_pointer(const struct sk_buff
*skb
)
869 static inline void skb_reset_tail_pointer(struct sk_buff
*skb
)
871 skb
->tail
= skb
->data
;
874 static inline void skb_set_tail_pointer(struct sk_buff
*skb
, const int offset
)
876 skb
->tail
= skb
->data
+ offset
;
879 #endif /* NET_SKBUFF_DATA_USES_OFFSET */
882 * Add data to an sk_buff
884 static inline unsigned char *__skb_put(struct sk_buff
*skb
, unsigned int len
)
886 unsigned char *tmp
= skb_tail_pointer(skb
);
887 SKB_LINEAR_ASSERT(skb
);
894 * skb_put - add data to a buffer
895 * @skb: buffer to use
896 * @len: amount of data to add
898 * This function extends the used data area of the buffer. If this would
899 * exceed the total buffer size the kernel will panic. A pointer to the
900 * first byte of the extra data is returned.
902 static inline unsigned char *skb_put(struct sk_buff
*skb
, unsigned int len
)
904 unsigned char *tmp
= skb_tail_pointer(skb
);
905 SKB_LINEAR_ASSERT(skb
);
908 if (unlikely(skb
->tail
> skb
->end
))
909 skb_over_panic(skb
, len
, current_text_addr());
913 static inline unsigned char *__skb_push(struct sk_buff
*skb
, unsigned int len
)
921 * skb_push - add data to the start of a buffer
922 * @skb: buffer to use
923 * @len: amount of data to add
925 * This function extends the used data area of the buffer at the buffer
926 * start. If this would exceed the total buffer headroom the kernel will
927 * panic. A pointer to the first byte of the extra data is returned.
929 static inline unsigned char *skb_push(struct sk_buff
*skb
, unsigned int len
)
933 if (unlikely(skb
->data
<skb
->head
))
934 skb_under_panic(skb
, len
, current_text_addr());
938 static inline unsigned char *__skb_pull(struct sk_buff
*skb
, unsigned int len
)
941 BUG_ON(skb
->len
< skb
->data_len
);
942 return skb
->data
+= len
;
946 * skb_pull - remove data from the start of a buffer
947 * @skb: buffer to use
948 * @len: amount of data to remove
950 * This function removes data from the start of a buffer, returning
951 * the memory to the headroom. A pointer to the next data in the buffer
952 * is returned. Once the data has been pulled future pushes will overwrite
955 static inline unsigned char *skb_pull(struct sk_buff
*skb
, unsigned int len
)
957 return unlikely(len
> skb
->len
) ? NULL
: __skb_pull(skb
, len
);
960 extern unsigned char *__pskb_pull_tail(struct sk_buff
*skb
, int delta
);
962 static inline unsigned char *__pskb_pull(struct sk_buff
*skb
, unsigned int len
)
964 if (len
> skb_headlen(skb
) &&
965 !__pskb_pull_tail(skb
, len
-skb_headlen(skb
)))
968 return skb
->data
+= len
;
971 static inline unsigned char *pskb_pull(struct sk_buff
*skb
, unsigned int len
)
973 return unlikely(len
> skb
->len
) ? NULL
: __pskb_pull(skb
, len
);
976 static inline int pskb_may_pull(struct sk_buff
*skb
, unsigned int len
)
978 if (likely(len
<= skb_headlen(skb
)))
980 if (unlikely(len
> skb
->len
))
982 return __pskb_pull_tail(skb
, len
-skb_headlen(skb
)) != NULL
;
986 * skb_headroom - bytes at buffer head
987 * @skb: buffer to check
989 * Return the number of bytes of free space at the head of an &sk_buff.
991 static inline int skb_headroom(const struct sk_buff
*skb
)
993 return skb
->data
- skb
->head
;
997 * skb_tailroom - bytes at buffer end
998 * @skb: buffer to check
1000 * Return the number of bytes of free space at the tail of an sk_buff
1002 static inline int skb_tailroom(const struct sk_buff
*skb
)
1004 return skb_is_nonlinear(skb
) ? 0 : skb
->end
- skb
->tail
;
1008 * skb_reserve - adjust headroom
1009 * @skb: buffer to alter
1010 * @len: bytes to move
1012 * Increase the headroom of an empty &sk_buff by reducing the tail
1013 * room. This is only allowed for an empty buffer.
1015 static inline void skb_reserve(struct sk_buff
*skb
, int len
)
1021 #ifdef NET_SKBUFF_DATA_USES_OFFSET
1022 static inline unsigned char *skb_transport_header(const struct sk_buff
*skb
)
1024 return skb
->head
+ skb
->transport_header
;
1027 static inline void skb_reset_transport_header(struct sk_buff
*skb
)
1029 skb
->transport_header
= skb
->data
- skb
->head
;
1032 static inline void skb_set_transport_header(struct sk_buff
*skb
,
1035 skb_reset_transport_header(skb
);
1036 skb
->transport_header
+= offset
;
1039 static inline unsigned char *skb_network_header(const struct sk_buff
*skb
)
1041 return skb
->head
+ skb
->network_header
;
1044 static inline void skb_reset_network_header(struct sk_buff
*skb
)
1046 skb
->network_header
= skb
->data
- skb
->head
;
1049 static inline void skb_set_network_header(struct sk_buff
*skb
, const int offset
)
1051 skb_reset_network_header(skb
);
1052 skb
->network_header
+= offset
;
1055 static inline unsigned char *skb_mac_header(const struct sk_buff
*skb
)
1057 return skb
->head
+ skb
->mac_header
;
1060 static inline int skb_mac_header_was_set(const struct sk_buff
*skb
)
1062 return skb
->mac_header
!= ~0U;
1065 static inline void skb_reset_mac_header(struct sk_buff
*skb
)
1067 skb
->mac_header
= skb
->data
- skb
->head
;
1070 static inline void skb_set_mac_header(struct sk_buff
*skb
, const int offset
)
1072 skb_reset_mac_header(skb
);
1073 skb
->mac_header
+= offset
;
1076 #else /* NET_SKBUFF_DATA_USES_OFFSET */
1078 static inline unsigned char *skb_transport_header(const struct sk_buff
*skb
)
1080 return skb
->transport_header
;
1083 static inline void skb_reset_transport_header(struct sk_buff
*skb
)
1085 skb
->transport_header
= skb
->data
;
1088 static inline void skb_set_transport_header(struct sk_buff
*skb
,
1091 skb
->transport_header
= skb
->data
+ offset
;
1094 static inline unsigned char *skb_network_header(const struct sk_buff
*skb
)
1096 return skb
->network_header
;
1099 static inline void skb_reset_network_header(struct sk_buff
*skb
)
1101 skb
->network_header
= skb
->data
;
1104 static inline void skb_set_network_header(struct sk_buff
*skb
, const int offset
)
1106 skb
->network_header
= skb
->data
+ offset
;
1109 static inline unsigned char *skb_mac_header(const struct sk_buff
*skb
)
1111 return skb
->mac_header
;
1114 static inline int skb_mac_header_was_set(const struct sk_buff
*skb
)
1116 return skb
->mac_header
!= NULL
;
1119 static inline void skb_reset_mac_header(struct sk_buff
*skb
)
1121 skb
->mac_header
= skb
->data
;
1124 static inline void skb_set_mac_header(struct sk_buff
*skb
, const int offset
)
1126 skb
->mac_header
= skb
->data
+ offset
;
1128 #endif /* NET_SKBUFF_DATA_USES_OFFSET */
1130 static inline int skb_transport_offset(const struct sk_buff
*skb
)
1132 return skb_transport_header(skb
) - skb
->data
;
1135 static inline u32
skb_network_header_len(const struct sk_buff
*skb
)
1137 return skb
->transport_header
- skb
->network_header
;
1140 static inline int skb_network_offset(const struct sk_buff
*skb
)
1142 return skb_network_header(skb
) - skb
->data
;
1146 * CPUs often take a performance hit when accessing unaligned memory
1147 * locations. The actual performance hit varies, it can be small if the
1148 * hardware handles it or large if we have to take an exception and fix it
1151 * Since an ethernet header is 14 bytes network drivers often end up with
1152 * the IP header at an unaligned offset. The IP header can be aligned by
1153 * shifting the start of the packet by 2 bytes. Drivers should do this
1156 * skb_reserve(NET_IP_ALIGN);
1158 * The downside to this alignment of the IP header is that the DMA is now
1159 * unaligned. On some architectures the cost of an unaligned DMA is high
1160 * and this cost outweighs the gains made by aligning the IP header.
1162 * Since this trade off varies between architectures, we allow NET_IP_ALIGN
1165 #ifndef NET_IP_ALIGN
1166 #define NET_IP_ALIGN 2
1170 * The networking layer reserves some headroom in skb data (via
1171 * dev_alloc_skb). This is used to avoid having to reallocate skb data when
1172 * the header has to grow. In the default case, if the header has to grow
1173 * 16 bytes or less we avoid the reallocation.
1175 * Unfortunately this headroom changes the DMA alignment of the resulting
1176 * network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive
1177 * on some architectures. An architecture can override this value,
1178 * perhaps setting it to a cacheline in size (since that will maintain
1179 * cacheline alignment of the DMA). It must be a power of 2.
1181 * Various parts of the networking layer expect at least 16 bytes of
1182 * headroom, you should not reduce this.
1184 * This has been changed to 64 to acommodate for routing between ethernet
1185 * and wireless, but only for new allocations
1188 #define NET_SKB_PAD 16
1191 #ifndef NET_SKB_PAD_ALLOC
1192 #define NET_SKB_PAD_ALLOC 64
1195 extern int ___pskb_trim(struct sk_buff
*skb
, unsigned int len
);
1197 static inline void __skb_trim(struct sk_buff
*skb
, unsigned int len
)
1199 if (unlikely(skb
->data_len
)) {
1204 skb_set_tail_pointer(skb
, len
);
1208 * skb_trim - remove end from a buffer
1209 * @skb: buffer to alter
1212 * Cut the length of a buffer down by removing data from the tail. If
1213 * the buffer is already under the length specified it is not modified.
1214 * The skb must be linear.
1216 static inline void skb_trim(struct sk_buff
*skb
, unsigned int len
)
1219 __skb_trim(skb
, len
);
1223 static inline int __pskb_trim(struct sk_buff
*skb
, unsigned int len
)
1226 return ___pskb_trim(skb
, len
);
1227 __skb_trim(skb
, len
);
1231 static inline int pskb_trim(struct sk_buff
*skb
, unsigned int len
)
1233 return (len
< skb
->len
) ? __pskb_trim(skb
, len
) : 0;
1237 * pskb_trim_unique - remove end from a paged unique (not cloned) buffer
1238 * @skb: buffer to alter
1241 * This is identical to pskb_trim except that the caller knows that
1242 * the skb is not cloned so we should never get an error due to out-
1245 static inline void pskb_trim_unique(struct sk_buff
*skb
, unsigned int len
)
1247 int err
= pskb_trim(skb
, len
);
1252 * skb_orphan - orphan a buffer
1253 * @skb: buffer to orphan
1255 * If a buffer currently has an owner then we call the owner's
1256 * destructor function and make the @skb unowned. The buffer continues
1257 * to exist but is no longer charged to its former owner.
1259 static inline void skb_orphan(struct sk_buff
*skb
)
1261 if (skb
->destructor
)
1262 skb
->destructor(skb
);
1263 skb
->destructor
= NULL
;
1268 * __skb_queue_purge - empty a list
1269 * @list: list to empty
1271 * Delete all buffers on an &sk_buff list. Each buffer is removed from
1272 * the list and one reference dropped. This function does not take the
1273 * list lock and the caller must hold the relevant locks to use it.
1275 extern void skb_queue_purge(struct sk_buff_head
*list
);
1276 static inline void __skb_queue_purge(struct sk_buff_head
*list
)
1278 struct sk_buff
*skb
;
1279 while ((skb
= __skb_dequeue(list
)) != NULL
)
1284 * __dev_alloc_skb - allocate an skbuff for receiving
1285 * @length: length to allocate
1286 * @gfp_mask: get_free_pages mask, passed to alloc_skb
1288 * Allocate a new &sk_buff and assign it a usage count of one. The
1289 * buffer has unspecified headroom built in. Users should allocate
1290 * the headroom they think they need without accounting for the
1291 * built in space. The built in space is used for optimisations.
1293 * %NULL is returned if there is no free memory.
1295 static inline struct sk_buff
*__dev_alloc_skb(unsigned int length
,
1298 struct sk_buff
*skb
= alloc_skb(length
+ NET_SKB_PAD_ALLOC
, gfp_mask
);
1300 skb_reserve(skb
, NET_SKB_PAD_ALLOC
);
1305 * dev_alloc_skb - allocate an skbuff for receiving
1306 * @length: length to allocate
1308 * Allocate a new &sk_buff and assign it a usage count of one. The
1309 * buffer has unspecified headroom built in. Users should allocate
1310 * the headroom they think they need without accounting for the
1311 * built in space. The built in space is used for optimisations.
1313 * %NULL is returned if there is no free memory. Although this function
1314 * allocates memory it can be called from an interrupt.
1316 static inline struct sk_buff
*dev_alloc_skb(unsigned int length
)
1318 return __dev_alloc_skb(length
, GFP_ATOMIC
);
1321 extern struct sk_buff
*__netdev_alloc_skb(struct net_device
*dev
,
1322 unsigned int length
, gfp_t gfp_mask
);
1325 * netdev_alloc_skb - allocate an skbuff for rx on a specific device
1326 * @dev: network device to receive on
1327 * @length: length to allocate
1329 * Allocate a new &sk_buff and assign it a usage count of one. The
1330 * buffer has unspecified headroom built in. Users should allocate
1331 * the headroom they think they need without accounting for the
1332 * built in space. The built in space is used for optimisations.
1334 * %NULL is returned if there is no free memory. Although this function
1335 * allocates memory it can be called from an interrupt.
1337 static inline struct sk_buff
*netdev_alloc_skb(struct net_device
*dev
,
1338 unsigned int length
)
1340 return __netdev_alloc_skb(dev
, length
, GFP_ATOMIC
);
1344 * skb_clone_writable - is the header of a clone writable
1345 * @skb: buffer to check
1346 * @len: length up to which to write
1348 * Returns true if modifying the header part of the cloned buffer
1349 * does not requires the data to be copied.
1351 static inline int skb_clone_writable(struct sk_buff
*skb
, int len
)
1353 return !skb_header_cloned(skb
) &&
1354 skb_headroom(skb
) + len
<= skb
->hdr_len
;
1358 * skb_cow - copy header of skb when it is required
1359 * @skb: buffer to cow
1360 * @headroom: needed headroom
1362 * If the skb passed lacks sufficient headroom or its data part
1363 * is shared, data is reallocated. If reallocation fails, an error
1364 * is returned and original skb is not changed.
1366 * The result is skb with writable area skb->head...skb->tail
1367 * and at least @headroom of space at head.
1369 static inline int skb_cow(struct sk_buff
*skb
, unsigned int headroom
)
1371 int delta
= (headroom
> NET_SKB_PAD
? headroom
: NET_SKB_PAD
) -
1377 if (delta
|| skb_cloned(skb
))
1378 return pskb_expand_head(skb
, (delta
+ (NET_SKB_PAD_ALLOC
-1)) &
1379 ~(NET_SKB_PAD_ALLOC
-1), 0, GFP_ATOMIC
);
1384 * skb_padto - pad an skbuff up to a minimal size
1385 * @skb: buffer to pad
1386 * @len: minimal length
1388 * Pads up a buffer to ensure the trailing bytes exist and are
1389 * blanked. If the buffer already contains sufficient data it
1390 * is untouched. Otherwise it is extended. Returns zero on
1391 * success. The skb is freed on error.
1394 static inline int skb_padto(struct sk_buff
*skb
, unsigned int len
)
1396 unsigned int size
= skb
->len
;
1397 if (likely(size
>= len
))
1399 return skb_pad(skb
, len
-size
);
1402 static inline int skb_add_data(struct sk_buff
*skb
,
1403 char __user
*from
, int copy
)
1405 const int off
= skb
->len
;
1407 if (skb
->ip_summed
== CHECKSUM_NONE
) {
1409 __wsum csum
= csum_and_copy_from_user(from
, skb_put(skb
, copy
),
1412 skb
->csum
= csum_block_add(skb
->csum
, csum
, off
);
1415 } else if (!copy_from_user(skb_put(skb
, copy
), from
, copy
))
1418 __skb_trim(skb
, off
);
1422 static inline int skb_can_coalesce(struct sk_buff
*skb
, int i
,
1423 struct page
*page
, int off
)
1426 struct skb_frag_struct
*frag
= &skb_shinfo(skb
)->frags
[i
- 1];
1428 return page
== frag
->page
&&
1429 off
== frag
->page_offset
+ frag
->size
;
1434 static inline int __skb_linearize(struct sk_buff
*skb
)
1436 return __pskb_pull_tail(skb
, skb
->data_len
) ? 0 : -ENOMEM
;
1440 * skb_linearize - convert paged skb to linear one
1441 * @skb: buffer to linarize
1443 * If there is no free memory -ENOMEM is returned, otherwise zero
1444 * is returned and the old skb data released.
1446 static inline int skb_linearize(struct sk_buff
*skb
)
1448 return skb_is_nonlinear(skb
) ? __skb_linearize(skb
) : 0;
1452 * skb_linearize_cow - make sure skb is linear and writable
1453 * @skb: buffer to process
1455 * If there is no free memory -ENOMEM is returned, otherwise zero
1456 * is returned and the old skb data released.
1458 static inline int skb_linearize_cow(struct sk_buff
*skb
)
1460 return skb_is_nonlinear(skb
) || skb_cloned(skb
) ?
1461 __skb_linearize(skb
) : 0;
1465 * skb_postpull_rcsum - update checksum for received skb after pull
1466 * @skb: buffer to update
1467 * @start: start of data before pull
1468 * @len: length of data pulled
1470 * After doing a pull on a received packet, you need to call this to
1471 * update the CHECKSUM_COMPLETE checksum, or set ip_summed to
1472 * CHECKSUM_NONE so that it can be recomputed from scratch.
1475 static inline void skb_postpull_rcsum(struct sk_buff
*skb
,
1476 const void *start
, unsigned int len
)
1478 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
1479 skb
->csum
= csum_sub(skb
->csum
, csum_partial(start
, len
, 0));
1482 unsigned char *skb_pull_rcsum(struct sk_buff
*skb
, unsigned int len
);
1485 * pskb_trim_rcsum - trim received skb and update checksum
1486 * @skb: buffer to trim
1489 * This is exactly the same as pskb_trim except that it ensures the
1490 * checksum of received packets are still valid after the operation.
1493 static inline int pskb_trim_rcsum(struct sk_buff
*skb
, unsigned int len
)
1495 if (likely(len
>= skb
->len
))
1497 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
1498 skb
->ip_summed
= CHECKSUM_NONE
;
1499 return __pskb_trim(skb
, len
);
1502 #define skb_queue_walk(queue, skb) \
1503 for (skb = (queue)->next; \
1504 prefetch(skb->next), (skb != (struct sk_buff *)(queue)); \
1507 #define skb_queue_walk_safe(queue, skb, tmp) \
1508 for (skb = (queue)->next, tmp = skb->next; \
1509 skb != (struct sk_buff *)(queue); \
1510 skb = tmp, tmp = skb->next)
1512 #define skb_queue_reverse_walk(queue, skb) \
1513 for (skb = (queue)->prev; \
1514 prefetch(skb->prev), (skb != (struct sk_buff *)(queue)); \
1518 extern struct sk_buff
*skb_recv_datagram(struct sock
*sk
, unsigned flags
,
1519 int noblock
, int *err
);
1520 extern unsigned int datagram_poll(struct file
*file
, struct socket
*sock
,
1521 struct poll_table_struct
*wait
);
1522 extern int skb_copy_datagram_iovec(const struct sk_buff
*from
,
1523 int offset
, struct iovec
*to
,
1525 extern int skb_copy_and_csum_datagram_iovec(struct sk_buff
*skb
,
1528 extern void skb_free_datagram(struct sock
*sk
, struct sk_buff
*skb
);
1529 extern void skb_kill_datagram(struct sock
*sk
, struct sk_buff
*skb
,
1530 unsigned int flags
);
1531 extern __wsum
skb_checksum(const struct sk_buff
*skb
, int offset
,
1532 int len
, __wsum csum
);
1533 extern int skb_copy_bits(const struct sk_buff
*skb
, int offset
,
1535 extern int skb_store_bits(struct sk_buff
*skb
, int offset
,
1536 const void *from
, int len
);
1537 extern __wsum
skb_copy_and_csum_bits(const struct sk_buff
*skb
,
1538 int offset
, u8
*to
, int len
,
1540 extern void skb_copy_and_csum_dev(const struct sk_buff
*skb
, u8
*to
);
1541 extern void skb_split(struct sk_buff
*skb
,
1542 struct sk_buff
*skb1
, const u32 len
);
1544 extern struct sk_buff
*skb_segment(struct sk_buff
*skb
, int features
);
1546 static inline void *skb_header_pointer(const struct sk_buff
*skb
, int offset
,
1547 int len
, void *buffer
)
1549 int hlen
= skb_headlen(skb
);
1551 if (hlen
- offset
>= len
)
1552 return skb
->data
+ offset
;
1554 if (skb_copy_bits(skb
, offset
, buffer
, len
) < 0)
1560 static inline void skb_copy_from_linear_data(const struct sk_buff
*skb
,
1562 const unsigned int len
)
1564 memcpy(to
, skb
->data
, len
);
1567 static inline void skb_copy_from_linear_data_offset(const struct sk_buff
*skb
,
1568 const int offset
, void *to
,
1569 const unsigned int len
)
1571 memcpy(to
, skb
->data
+ offset
, len
);
1574 static inline void skb_copy_to_linear_data(struct sk_buff
*skb
,
1576 const unsigned int len
)
1578 memcpy(skb
->data
, from
, len
);
1581 static inline void skb_copy_to_linear_data_offset(struct sk_buff
*skb
,
1584 const unsigned int len
)
1586 memcpy(skb
->data
+ offset
, from
, len
);
1589 extern void skb_init(void);
1592 * skb_get_timestamp - get timestamp from a skb
1593 * @skb: skb to get stamp from
1594 * @stamp: pointer to struct timeval to store stamp in
1596 * Timestamps are stored in the skb as offsets to a base timestamp.
1597 * This function converts the offset back to a struct timeval and stores
1600 static inline void skb_get_timestamp(const struct sk_buff
*skb
, struct timeval
*stamp
)
1602 *stamp
= ktime_to_timeval(skb
->tstamp
);
1605 static inline void __net_timestamp(struct sk_buff
*skb
)
1607 skb
->tstamp
= ktime_get_real();
1610 static inline ktime_t
net_timedelta(ktime_t t
)
1612 return ktime_sub(ktime_get_real(), t
);
1615 static inline ktime_t
net_invalid_timestamp(void)
1617 return ktime_set(0, 0);
1620 extern __sum16
__skb_checksum_complete_head(struct sk_buff
*skb
, int len
);
1621 extern __sum16
__skb_checksum_complete(struct sk_buff
*skb
);
1623 static inline int skb_csum_unnecessary(const struct sk_buff
*skb
)
1625 return skb
->ip_summed
& CHECKSUM_UNNECESSARY
;
1629 * skb_checksum_complete - Calculate checksum of an entire packet
1630 * @skb: packet to process
1632 * This function calculates the checksum over the entire packet plus
1633 * the value of skb->csum. The latter can be used to supply the
1634 * checksum of a pseudo header as used by TCP/UDP. It returns the
1637 * For protocols that contain complete checksums such as ICMP/TCP/UDP,
1638 * this function can be used to verify that checksum on received
1639 * packets. In that case the function should return zero if the
1640 * checksum is correct. In particular, this function will return zero
1641 * if skb->ip_summed is CHECKSUM_UNNECESSARY which indicates that the
1642 * hardware has already verified the correctness of the checksum.
1644 static inline unsigned int skb_checksum_complete(struct sk_buff
*skb
)
1646 return skb_csum_unnecessary(skb
) ?
1647 0 : __skb_checksum_complete(skb
);
1650 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1651 extern void nf_conntrack_destroy(struct nf_conntrack
*nfct
);
1652 static inline void nf_conntrack_put(struct nf_conntrack
*nfct
)
1654 if (nfct
&& atomic_dec_and_test(&nfct
->use
))
1655 nf_conntrack_destroy(nfct
);
1657 static inline void nf_conntrack_get(struct nf_conntrack
*nfct
)
1660 atomic_inc(&nfct
->use
);
1662 static inline void nf_conntrack_get_reasm(struct sk_buff
*skb
)
1665 atomic_inc(&skb
->users
);
1667 static inline void nf_conntrack_put_reasm(struct sk_buff
*skb
)
1673 #ifdef CONFIG_BRIDGE_NETFILTER
1674 static inline void nf_bridge_put(struct nf_bridge_info
*nf_bridge
)
1676 if (nf_bridge
&& atomic_dec_and_test(&nf_bridge
->use
))
1679 static inline void nf_bridge_get(struct nf_bridge_info
*nf_bridge
)
1682 atomic_inc(&nf_bridge
->use
);
1684 #endif /* CONFIG_BRIDGE_NETFILTER */
1685 static inline void nf_reset(struct sk_buff
*skb
)
1687 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1688 nf_conntrack_put(skb
->nfct
);
1690 nf_conntrack_put_reasm(skb
->nfct_reasm
);
1691 skb
->nfct_reasm
= NULL
;
1693 #ifdef CONFIG_BRIDGE_NETFILTER
1694 nf_bridge_put(skb
->nf_bridge
);
1695 skb
->nf_bridge
= NULL
;
1699 /* Note: This doesn't put any conntrack and bridge info in dst. */
1700 static inline void __nf_copy(struct sk_buff
*dst
, const struct sk_buff
*src
)
1702 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1703 dst
->nfct
= src
->nfct
;
1704 nf_conntrack_get(src
->nfct
);
1705 dst
->nfctinfo
= src
->nfctinfo
;
1706 dst
->nfct_reasm
= src
->nfct_reasm
;
1707 nf_conntrack_get_reasm(src
->nfct_reasm
);
1709 #ifdef CONFIG_BRIDGE_NETFILTER
1710 dst
->nf_bridge
= src
->nf_bridge
;
1711 nf_bridge_get(src
->nf_bridge
);
1713 #if defined(CONFIG_IMQ) || defined(CONFIG_IMQ_MODULE)
1714 dst
->imq_flags
= src
->imq_flags
;
1715 dst
->nf_info
= src
->nf_info
;
1719 static inline void nf_copy(struct sk_buff
*dst
, const struct sk_buff
*src
)
1721 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1722 nf_conntrack_put(dst
->nfct
);
1723 nf_conntrack_put_reasm(dst
->nfct_reasm
);
1725 #ifdef CONFIG_BRIDGE_NETFILTER
1726 nf_bridge_put(dst
->nf_bridge
);
1728 __nf_copy(dst
, src
);
1731 #ifdef CONFIG_NETWORK_SECMARK
1732 static inline void skb_copy_secmark(struct sk_buff
*to
, const struct sk_buff
*from
)
1734 to
->secmark
= from
->secmark
;
1737 static inline void skb_init_secmark(struct sk_buff
*skb
)
1742 static inline void skb_copy_secmark(struct sk_buff
*to
, const struct sk_buff
*from
)
1745 static inline void skb_init_secmark(struct sk_buff
*skb
)
1749 static inline int skb_is_gso(const struct sk_buff
*skb
)
1751 return skb_shinfo(skb
)->gso_size
;
1754 static inline void skb_forward_csum(struct sk_buff
*skb
)
1756 /* Unfortunately we don't support this one. Any brave souls? */
1757 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
1758 skb
->ip_summed
= CHECKSUM_NONE
;
1761 #endif /* __KERNEL__ */
1762 #endif /* _LINUX_SKBUFF_H */