Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Routines having to do with the 'struct sk_buff' memory handlers. | |
3 | * | |
113aa838 | 4 | * Authors: Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
5 | * Florian La Roche <rzsfl@rz.uni-sb.de> |
6 | * | |
1da177e4 LT |
7 | * Fixes: |
8 | * Alan Cox : Fixed the worst of the load | |
9 | * balancer bugs. | |
10 | * Dave Platt : Interrupt stacking fix. | |
11 | * Richard Kooijman : Timestamp fixes. | |
12 | * Alan Cox : Changed buffer format. | |
13 | * Alan Cox : destructor hook for AF_UNIX etc. | |
14 | * Linus Torvalds : Better skb_clone. | |
15 | * Alan Cox : Added skb_copy. | |
16 | * Alan Cox : Added all the changed routines Linus | |
17 | * only put in the headers | |
18 | * Ray VanTassle : Fixed --skb->lock in free | |
19 | * Alan Cox : skb_copy copy arp field | |
20 | * Andi Kleen : slabified it. | |
21 | * Robert Olsson : Removed skb_head_pool | |
22 | * | |
23 | * NOTE: | |
24 | * The __skb_ routines should be called with interrupts | |
25 | * disabled, or you better be *real* sure that the operation is atomic | |
26 | * with respect to whatever list is being frobbed (e.g. via lock_sock() | |
27 | * or via disabling bottom half handlers, etc). | |
28 | * | |
29 | * This program is free software; you can redistribute it and/or | |
30 | * modify it under the terms of the GNU General Public License | |
31 | * as published by the Free Software Foundation; either version | |
32 | * 2 of the License, or (at your option) any later version. | |
33 | */ | |
34 | ||
35 | /* | |
36 | * The functions in this file will not compile correctly with gcc 2.4.x | |
37 | */ | |
38 | ||
e005d193 JP |
39 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
40 | ||
1da177e4 LT |
41 | #include <linux/module.h> |
42 | #include <linux/types.h> | |
43 | #include <linux/kernel.h> | |
fe55f6d5 | 44 | #include <linux/kmemcheck.h> |
1da177e4 LT |
45 | #include <linux/mm.h> |
46 | #include <linux/interrupt.h> | |
47 | #include <linux/in.h> | |
48 | #include <linux/inet.h> | |
49 | #include <linux/slab.h> | |
50 | #include <linux/netdevice.h> | |
51 | #ifdef CONFIG_NET_CLS_ACT | |
52 | #include <net/pkt_sched.h> | |
53 | #endif | |
54 | #include <linux/string.h> | |
55 | #include <linux/skbuff.h> | |
9c55e01c | 56 | #include <linux/splice.h> |
1da177e4 LT |
57 | #include <linux/cache.h> |
58 | #include <linux/rtnetlink.h> | |
59 | #include <linux/init.h> | |
716ea3a7 | 60 | #include <linux/scatterlist.h> |
ac45f602 | 61 | #include <linux/errqueue.h> |
268bb0ce | 62 | #include <linux/prefetch.h> |
1da177e4 LT |
63 | |
64 | #include <net/protocol.h> | |
65 | #include <net/dst.h> | |
66 | #include <net/sock.h> | |
67 | #include <net/checksum.h> | |
68 | #include <net/xfrm.h> | |
69 | ||
70 | #include <asm/uaccess.h> | |
ad8d75ff | 71 | #include <trace/events/skb.h> |
51c56b00 | 72 | #include <linux/highmem.h> |
a1f8e7f7 | 73 | |
d7e8883c | 74 | struct kmem_cache *skbuff_head_cache __read_mostly; |
e18b890b | 75 | static struct kmem_cache *skbuff_fclone_cache __read_mostly; |
1da177e4 | 76 | |
9c55e01c JA |
77 | static void sock_pipe_buf_release(struct pipe_inode_info *pipe, |
78 | struct pipe_buffer *buf) | |
79 | { | |
8b9d3728 | 80 | put_page(buf->page); |
9c55e01c JA |
81 | } |
82 | ||
83 | static void sock_pipe_buf_get(struct pipe_inode_info *pipe, | |
84 | struct pipe_buffer *buf) | |
85 | { | |
8b9d3728 | 86 | get_page(buf->page); |
9c55e01c JA |
87 | } |
88 | ||
89 | static int sock_pipe_buf_steal(struct pipe_inode_info *pipe, | |
90 | struct pipe_buffer *buf) | |
91 | { | |
92 | return 1; | |
93 | } | |
94 | ||
95 | ||
96 | /* Pipe buffer operations for a socket. */ | |
28dfef8f | 97 | static const struct pipe_buf_operations sock_pipe_buf_ops = { |
9c55e01c JA |
98 | .can_merge = 0, |
99 | .map = generic_pipe_buf_map, | |
100 | .unmap = generic_pipe_buf_unmap, | |
101 | .confirm = generic_pipe_buf_confirm, | |
102 | .release = sock_pipe_buf_release, | |
103 | .steal = sock_pipe_buf_steal, | |
104 | .get = sock_pipe_buf_get, | |
105 | }; | |
106 | ||
1da177e4 LT |
107 | /* |
108 | * Keep out-of-line to prevent kernel bloat. | |
109 | * __builtin_return_address is not used because it is not always | |
110 | * reliable. | |
111 | */ | |
112 | ||
113 | /** | |
114 | * skb_over_panic - private function | |
115 | * @skb: buffer | |
116 | * @sz: size | |
117 | * @here: address | |
118 | * | |
119 | * Out of line support code for skb_put(). Not user callable. | |
120 | */ | |
ccb7c773 | 121 | static void skb_over_panic(struct sk_buff *skb, int sz, void *here) |
1da177e4 | 122 | { |
e005d193 JP |
123 | pr_emerg("%s: text:%p len:%d put:%d head:%p data:%p tail:%#lx end:%#lx dev:%s\n", |
124 | __func__, here, skb->len, sz, skb->head, skb->data, | |
125 | (unsigned long)skb->tail, (unsigned long)skb->end, | |
126 | skb->dev ? skb->dev->name : "<NULL>"); | |
1da177e4 LT |
127 | BUG(); |
128 | } | |
129 | ||
130 | /** | |
131 | * skb_under_panic - private function | |
132 | * @skb: buffer | |
133 | * @sz: size | |
134 | * @here: address | |
135 | * | |
136 | * Out of line support code for skb_push(). Not user callable. | |
137 | */ | |
138 | ||
ccb7c773 | 139 | static void skb_under_panic(struct sk_buff *skb, int sz, void *here) |
1da177e4 | 140 | { |
e005d193 JP |
141 | pr_emerg("%s: text:%p len:%d put:%d head:%p data:%p tail:%#lx end:%#lx dev:%s\n", |
142 | __func__, here, skb->len, sz, skb->head, skb->data, | |
143 | (unsigned long)skb->tail, (unsigned long)skb->end, | |
144 | skb->dev ? skb->dev->name : "<NULL>"); | |
1da177e4 LT |
145 | BUG(); |
146 | } | |
147 | ||
148 | /* Allocate a new skbuff. We do this ourselves so we can fill in a few | |
149 | * 'private' fields and also do memory statistics to find all the | |
150 | * [BEEP] leaks. | |
151 | * | |
152 | */ | |
153 | ||
154 | /** | |
d179cd12 | 155 | * __alloc_skb - allocate a network buffer |
1da177e4 LT |
156 | * @size: size to allocate |
157 | * @gfp_mask: allocation mask | |
c83c2486 RD |
158 | * @fclone: allocate from fclone cache instead of head cache |
159 | * and allocate a cloned (child) skb | |
b30973f8 | 160 | * @node: numa node to allocate memory on |
1da177e4 LT |
161 | * |
162 | * Allocate a new &sk_buff. The returned buffer has no headroom and a | |
163 | * tail room of size bytes. The object has a reference count of one. | |
164 | * The return is the buffer. On a failure the return is %NULL. | |
165 | * | |
166 | * Buffers may only be allocated from interrupts using a @gfp_mask of | |
167 | * %GFP_ATOMIC. | |
168 | */ | |
dd0fc66f | 169 | struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask, |
b30973f8 | 170 | int fclone, int node) |
1da177e4 | 171 | { |
e18b890b | 172 | struct kmem_cache *cache; |
4947d3ef | 173 | struct skb_shared_info *shinfo; |
1da177e4 LT |
174 | struct sk_buff *skb; |
175 | u8 *data; | |
176 | ||
8798b3fb HX |
177 | cache = fclone ? skbuff_fclone_cache : skbuff_head_cache; |
178 | ||
1da177e4 | 179 | /* Get the HEAD */ |
b30973f8 | 180 | skb = kmem_cache_alloc_node(cache, gfp_mask & ~__GFP_DMA, node); |
1da177e4 LT |
181 | if (!skb) |
182 | goto out; | |
ec7d2f2c | 183 | prefetchw(skb); |
1da177e4 | 184 | |
87fb4b7b ED |
185 | /* We do our best to align skb_shared_info on a separate cache |
186 | * line. It usually works because kmalloc(X > SMP_CACHE_BYTES) gives | |
187 | * aligned memory blocks, unless SLUB/SLAB debug is enabled. | |
188 | * Both skb->head and skb_shared_info are cache line aligned. | |
189 | */ | |
bc417e30 | 190 | size = SKB_DATA_ALIGN(size); |
87fb4b7b ED |
191 | size += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
192 | data = kmalloc_node_track_caller(size, gfp_mask, node); | |
1da177e4 LT |
193 | if (!data) |
194 | goto nodata; | |
87fb4b7b ED |
195 | /* kmalloc(size) might give us more room than requested. |
196 | * Put skb_shared_info exactly at the end of allocated zone, | |
197 | * to allow max possible filling before reallocation. | |
198 | */ | |
199 | size = SKB_WITH_OVERHEAD(ksize(data)); | |
ec7d2f2c | 200 | prefetchw(data + size); |
1da177e4 | 201 | |
ca0605a7 | 202 | /* |
c8005785 JB |
203 | * Only clear those fields we need to clear, not those that we will |
204 | * actually initialise below. Hence, don't put any more fields after | |
205 | * the tail pointer in struct sk_buff! | |
ca0605a7 ACM |
206 | */ |
207 | memset(skb, 0, offsetof(struct sk_buff, tail)); | |
87fb4b7b ED |
208 | /* Account for allocated memory : skb + skb->head */ |
209 | skb->truesize = SKB_TRUESIZE(size); | |
1da177e4 LT |
210 | atomic_set(&skb->users, 1); |
211 | skb->head = data; | |
212 | skb->data = data; | |
27a884dc | 213 | skb_reset_tail_pointer(skb); |
4305b541 | 214 | skb->end = skb->tail + size; |
19633e12 SH |
215 | #ifdef NET_SKBUFF_DATA_USES_OFFSET |
216 | skb->mac_header = ~0U; | |
217 | #endif | |
218 | ||
4947d3ef BL |
219 | /* make sure we initialize shinfo sequentially */ |
220 | shinfo = skb_shinfo(skb); | |
ec7d2f2c | 221 | memset(shinfo, 0, offsetof(struct skb_shared_info, dataref)); |
4947d3ef | 222 | atomic_set(&shinfo->dataref, 1); |
c2aa3665 | 223 | kmemcheck_annotate_variable(shinfo->destructor_arg); |
4947d3ef | 224 | |
d179cd12 DM |
225 | if (fclone) { |
226 | struct sk_buff *child = skb + 1; | |
227 | atomic_t *fclone_ref = (atomic_t *) (child + 1); | |
1da177e4 | 228 | |
fe55f6d5 VN |
229 | kmemcheck_annotate_bitfield(child, flags1); |
230 | kmemcheck_annotate_bitfield(child, flags2); | |
d179cd12 DM |
231 | skb->fclone = SKB_FCLONE_ORIG; |
232 | atomic_set(fclone_ref, 1); | |
233 | ||
234 | child->fclone = SKB_FCLONE_UNAVAILABLE; | |
235 | } | |
1da177e4 LT |
236 | out: |
237 | return skb; | |
238 | nodata: | |
8798b3fb | 239 | kmem_cache_free(cache, skb); |
1da177e4 LT |
240 | skb = NULL; |
241 | goto out; | |
1da177e4 | 242 | } |
b4ac530f | 243 | EXPORT_SYMBOL(__alloc_skb); |
1da177e4 | 244 | |
b2b5ce9d ED |
245 | /** |
246 | * build_skb - build a network buffer | |
247 | * @data: data buffer provided by caller | |
d3836f21 | 248 | * @frag_size: size of fragment, or 0 if head was kmalloced |
b2b5ce9d ED |
249 | * |
250 | * Allocate a new &sk_buff. Caller provides space holding head and | |
251 | * skb_shared_info. @data must have been allocated by kmalloc() | |
252 | * The return is the new skb buffer. | |
253 | * On a failure the return is %NULL, and @data is not freed. | |
254 | * Notes : | |
255 | * Before IO, driver allocates only data buffer where NIC put incoming frame | |
256 | * Driver should add room at head (NET_SKB_PAD) and | |
257 | * MUST add room at tail (SKB_DATA_ALIGN(skb_shared_info)) | |
258 | * After IO, driver calls build_skb(), to allocate sk_buff and populate it | |
259 | * before giving packet to stack. | |
260 | * RX rings only contains data buffers, not full skbs. | |
261 | */ | |
d3836f21 | 262 | struct sk_buff *build_skb(void *data, unsigned int frag_size) |
b2b5ce9d ED |
263 | { |
264 | struct skb_shared_info *shinfo; | |
265 | struct sk_buff *skb; | |
d3836f21 | 266 | unsigned int size = frag_size ? : ksize(data); |
b2b5ce9d ED |
267 | |
268 | skb = kmem_cache_alloc(skbuff_head_cache, GFP_ATOMIC); | |
269 | if (!skb) | |
270 | return NULL; | |
271 | ||
d3836f21 | 272 | size -= SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
b2b5ce9d ED |
273 | |
274 | memset(skb, 0, offsetof(struct sk_buff, tail)); | |
275 | skb->truesize = SKB_TRUESIZE(size); | |
d3836f21 | 276 | skb->head_frag = frag_size != 0; |
b2b5ce9d ED |
277 | atomic_set(&skb->users, 1); |
278 | skb->head = data; | |
279 | skb->data = data; | |
280 | skb_reset_tail_pointer(skb); | |
281 | skb->end = skb->tail + size; | |
282 | #ifdef NET_SKBUFF_DATA_USES_OFFSET | |
283 | skb->mac_header = ~0U; | |
284 | #endif | |
285 | ||
286 | /* make sure we initialize shinfo sequentially */ | |
287 | shinfo = skb_shinfo(skb); | |
288 | memset(shinfo, 0, offsetof(struct skb_shared_info, dataref)); | |
289 | atomic_set(&shinfo->dataref, 1); | |
290 | kmemcheck_annotate_variable(shinfo->destructor_arg); | |
291 | ||
292 | return skb; | |
293 | } | |
294 | EXPORT_SYMBOL(build_skb); | |
295 | ||
a1c7fff7 ED |
296 | struct netdev_alloc_cache { |
297 | struct page *page; | |
298 | unsigned int offset; | |
299 | }; | |
300 | static DEFINE_PER_CPU(struct netdev_alloc_cache, netdev_alloc_cache); | |
301 | ||
6f532612 ED |
302 | /** |
303 | * netdev_alloc_frag - allocate a page fragment | |
304 | * @fragsz: fragment size | |
305 | * | |
306 | * Allocates a frag from a page for receive buffer. | |
307 | * Uses GFP_ATOMIC allocations. | |
308 | */ | |
309 | void *netdev_alloc_frag(unsigned int fragsz) | |
310 | { | |
311 | struct netdev_alloc_cache *nc; | |
312 | void *data = NULL; | |
313 | unsigned long flags; | |
314 | ||
315 | local_irq_save(flags); | |
316 | nc = &__get_cpu_var(netdev_alloc_cache); | |
317 | if (unlikely(!nc->page)) { | |
318 | refill: | |
319 | nc->page = alloc_page(GFP_ATOMIC | __GFP_COLD); | |
320 | nc->offset = 0; | |
321 | } | |
322 | if (likely(nc->page)) { | |
323 | if (nc->offset + fragsz > PAGE_SIZE) { | |
324 | put_page(nc->page); | |
325 | goto refill; | |
326 | } | |
327 | data = page_address(nc->page) + nc->offset; | |
328 | nc->offset += fragsz; | |
329 | get_page(nc->page); | |
330 | } | |
331 | local_irq_restore(flags); | |
332 | return data; | |
333 | } | |
334 | EXPORT_SYMBOL(netdev_alloc_frag); | |
335 | ||
8af27456 CH |
336 | /** |
337 | * __netdev_alloc_skb - allocate an skbuff for rx on a specific device | |
338 | * @dev: network device to receive on | |
339 | * @length: length to allocate | |
340 | * @gfp_mask: get_free_pages mask, passed to alloc_skb | |
341 | * | |
342 | * Allocate a new &sk_buff and assign it a usage count of one. The | |
343 | * buffer has unspecified headroom built in. Users should allocate | |
344 | * the headroom they think they need without accounting for the | |
345 | * built in space. The built in space is used for optimisations. | |
346 | * | |
347 | * %NULL is returned if there is no free memory. | |
348 | */ | |
349 | struct sk_buff *__netdev_alloc_skb(struct net_device *dev, | |
6f532612 | 350 | unsigned int length, gfp_t gfp_mask) |
8af27456 | 351 | { |
6f532612 | 352 | struct sk_buff *skb = NULL; |
a1c7fff7 ED |
353 | unsigned int fragsz = SKB_DATA_ALIGN(length + NET_SKB_PAD) + |
354 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
355 | ||
356 | if (fragsz <= PAGE_SIZE && !(gfp_mask & __GFP_WAIT)) { | |
6f532612 | 357 | void *data = netdev_alloc_frag(fragsz); |
a1c7fff7 | 358 | |
6f532612 ED |
359 | if (likely(data)) { |
360 | skb = build_skb(data, fragsz); | |
361 | if (unlikely(!skb)) | |
362 | put_page(virt_to_head_page(data)); | |
a1c7fff7 | 363 | } |
a1c7fff7 ED |
364 | } else { |
365 | skb = __alloc_skb(length + NET_SKB_PAD, gfp_mask, 0, NUMA_NO_NODE); | |
366 | } | |
7b2e497a | 367 | if (likely(skb)) { |
8af27456 | 368 | skb_reserve(skb, NET_SKB_PAD); |
7b2e497a CH |
369 | skb->dev = dev; |
370 | } | |
8af27456 CH |
371 | return skb; |
372 | } | |
b4ac530f | 373 | EXPORT_SYMBOL(__netdev_alloc_skb); |
1da177e4 | 374 | |
654bed16 | 375 | void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off, |
50269e19 | 376 | int size, unsigned int truesize) |
654bed16 PZ |
377 | { |
378 | skb_fill_page_desc(skb, i, page, off, size); | |
379 | skb->len += size; | |
380 | skb->data_len += size; | |
50269e19 | 381 | skb->truesize += truesize; |
654bed16 PZ |
382 | } |
383 | EXPORT_SYMBOL(skb_add_rx_frag); | |
384 | ||
27b437c8 | 385 | static void skb_drop_list(struct sk_buff **listp) |
1da177e4 | 386 | { |
27b437c8 | 387 | struct sk_buff *list = *listp; |
1da177e4 | 388 | |
27b437c8 | 389 | *listp = NULL; |
1da177e4 LT |
390 | |
391 | do { | |
392 | struct sk_buff *this = list; | |
393 | list = list->next; | |
394 | kfree_skb(this); | |
395 | } while (list); | |
396 | } | |
397 | ||
27b437c8 HX |
398 | static inline void skb_drop_fraglist(struct sk_buff *skb) |
399 | { | |
400 | skb_drop_list(&skb_shinfo(skb)->frag_list); | |
401 | } | |
402 | ||
1da177e4 LT |
403 | static void skb_clone_fraglist(struct sk_buff *skb) |
404 | { | |
405 | struct sk_buff *list; | |
406 | ||
fbb398a8 | 407 | skb_walk_frags(skb, list) |
1da177e4 LT |
408 | skb_get(list); |
409 | } | |
410 | ||
d3836f21 ED |
411 | static void skb_free_head(struct sk_buff *skb) |
412 | { | |
413 | if (skb->head_frag) | |
414 | put_page(virt_to_head_page(skb->head)); | |
415 | else | |
416 | kfree(skb->head); | |
417 | } | |
418 | ||
5bba1712 | 419 | static void skb_release_data(struct sk_buff *skb) |
1da177e4 LT |
420 | { |
421 | if (!skb->cloned || | |
422 | !atomic_sub_return(skb->nohdr ? (1 << SKB_DATAREF_SHIFT) + 1 : 1, | |
423 | &skb_shinfo(skb)->dataref)) { | |
424 | if (skb_shinfo(skb)->nr_frags) { | |
425 | int i; | |
426 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) | |
ea2ab693 | 427 | skb_frag_unref(skb, i); |
1da177e4 LT |
428 | } |
429 | ||
a6686f2f SM |
430 | /* |
431 | * If skb buf is from userspace, we need to notify the caller | |
432 | * the lower device DMA has done; | |
433 | */ | |
434 | if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) { | |
435 | struct ubuf_info *uarg; | |
436 | ||
437 | uarg = skb_shinfo(skb)->destructor_arg; | |
438 | if (uarg->callback) | |
439 | uarg->callback(uarg); | |
440 | } | |
441 | ||
21dc3301 | 442 | if (skb_has_frag_list(skb)) |
1da177e4 LT |
443 | skb_drop_fraglist(skb); |
444 | ||
d3836f21 | 445 | skb_free_head(skb); |
1da177e4 LT |
446 | } |
447 | } | |
448 | ||
449 | /* | |
450 | * Free an skbuff by memory without cleaning the state. | |
451 | */ | |
2d4baff8 | 452 | static void kfree_skbmem(struct sk_buff *skb) |
1da177e4 | 453 | { |
d179cd12 DM |
454 | struct sk_buff *other; |
455 | atomic_t *fclone_ref; | |
456 | ||
d179cd12 DM |
457 | switch (skb->fclone) { |
458 | case SKB_FCLONE_UNAVAILABLE: | |
459 | kmem_cache_free(skbuff_head_cache, skb); | |
460 | break; | |
461 | ||
462 | case SKB_FCLONE_ORIG: | |
463 | fclone_ref = (atomic_t *) (skb + 2); | |
464 | if (atomic_dec_and_test(fclone_ref)) | |
465 | kmem_cache_free(skbuff_fclone_cache, skb); | |
466 | break; | |
467 | ||
468 | case SKB_FCLONE_CLONE: | |
469 | fclone_ref = (atomic_t *) (skb + 1); | |
470 | other = skb - 1; | |
471 | ||
472 | /* The clone portion is available for | |
473 | * fast-cloning again. | |
474 | */ | |
475 | skb->fclone = SKB_FCLONE_UNAVAILABLE; | |
476 | ||
477 | if (atomic_dec_and_test(fclone_ref)) | |
478 | kmem_cache_free(skbuff_fclone_cache, other); | |
479 | break; | |
3ff50b79 | 480 | } |
1da177e4 LT |
481 | } |
482 | ||
04a4bb55 | 483 | static void skb_release_head_state(struct sk_buff *skb) |
1da177e4 | 484 | { |
adf30907 | 485 | skb_dst_drop(skb); |
1da177e4 LT |
486 | #ifdef CONFIG_XFRM |
487 | secpath_put(skb->sp); | |
488 | #endif | |
9c2b3328 SH |
489 | if (skb->destructor) { |
490 | WARN_ON(in_irq()); | |
1da177e4 LT |
491 | skb->destructor(skb); |
492 | } | |
a3bf7ae9 | 493 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
5f79e0f9 | 494 | nf_conntrack_put(skb->nfct); |
2fc72c7b KK |
495 | #endif |
496 | #ifdef NET_SKBUFF_NF_DEFRAG_NEEDED | |
9fb9cbb1 YK |
497 | nf_conntrack_put_reasm(skb->nfct_reasm); |
498 | #endif | |
1da177e4 LT |
499 | #ifdef CONFIG_BRIDGE_NETFILTER |
500 | nf_bridge_put(skb->nf_bridge); | |
501 | #endif | |
1da177e4 LT |
502 | /* XXX: IS this still necessary? - JHS */ |
503 | #ifdef CONFIG_NET_SCHED | |
504 | skb->tc_index = 0; | |
505 | #ifdef CONFIG_NET_CLS_ACT | |
506 | skb->tc_verd = 0; | |
1da177e4 LT |
507 | #endif |
508 | #endif | |
04a4bb55 LB |
509 | } |
510 | ||
511 | /* Free everything but the sk_buff shell. */ | |
512 | static void skb_release_all(struct sk_buff *skb) | |
513 | { | |
514 | skb_release_head_state(skb); | |
2d4baff8 HX |
515 | skb_release_data(skb); |
516 | } | |
517 | ||
518 | /** | |
519 | * __kfree_skb - private function | |
520 | * @skb: buffer | |
521 | * | |
522 | * Free an sk_buff. Release anything attached to the buffer. | |
523 | * Clean the state. This is an internal helper function. Users should | |
524 | * always call kfree_skb | |
525 | */ | |
1da177e4 | 526 | |
2d4baff8 HX |
527 | void __kfree_skb(struct sk_buff *skb) |
528 | { | |
529 | skb_release_all(skb); | |
1da177e4 LT |
530 | kfree_skbmem(skb); |
531 | } | |
b4ac530f | 532 | EXPORT_SYMBOL(__kfree_skb); |
1da177e4 | 533 |