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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Definitions for the 'struct sk_buff' memory handlers. | |
3 | * | |
4 | * Authors: | |
5 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
6 | * Florian La Roche, <rzsfl@rz.uni-sb.de> | |
7 | * | |
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. | |
12 | */ | |
13 | ||
14 | #ifndef _LINUX_SKBUFF_H | |
15 | #define _LINUX_SKBUFF_H | |
16 | ||
1da177e4 | 17 | #include <linux/kernel.h> |
fe55f6d5 | 18 | #include <linux/kmemcheck.h> |
1da177e4 LT |
19 | #include <linux/compiler.h> |
20 | #include <linux/time.h> | |
187f1882 | 21 | #include <linux/bug.h> |
1da177e4 LT |
22 | #include <linux/cache.h> |
23 | ||
60063497 | 24 | #include <linux/atomic.h> |
1da177e4 LT |
25 | #include <asm/types.h> |
26 | #include <linux/spinlock.h> | |
1da177e4 | 27 | #include <linux/net.h> |
3fc7e8a6 | 28 | #include <linux/textsearch.h> |
1da177e4 | 29 | #include <net/checksum.h> |
a80958f4 | 30 | #include <linux/rcupdate.h> |
97fc2f08 | 31 | #include <linux/dmaengine.h> |
b7aa0bf7 | 32 | #include <linux/hrtimer.h> |
131ea667 | 33 | #include <linux/dma-mapping.h> |
c8f44aff | 34 | #include <linux/netdev_features.h> |
5203cd28 | 35 | #include <net/flow_keys.h> |
1da177e4 | 36 | |
60476372 | 37 | /* Don't change this without changing skb_csum_unnecessary! */ |
1da177e4 | 38 | #define CHECKSUM_NONE 0 |
60476372 HX |
39 | #define CHECKSUM_UNNECESSARY 1 |
40 | #define CHECKSUM_COMPLETE 2 | |
41 | #define CHECKSUM_PARTIAL 3 | |
1da177e4 LT |
42 | |
43 | #define SKB_DATA_ALIGN(X) (((X) + (SMP_CACHE_BYTES - 1)) & \ | |
44 | ~(SMP_CACHE_BYTES - 1)) | |
fc910a27 | 45 | #define SKB_WITH_OVERHEAD(X) \ |
deea84b0 | 46 | ((X) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) |
fc910a27 DM |
47 | #define SKB_MAX_ORDER(X, ORDER) \ |
48 | SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X)) | |
1da177e4 LT |
49 | #define SKB_MAX_HEAD(X) (SKB_MAX_ORDER((X), 0)) |
50 | #define SKB_MAX_ALLOC (SKB_MAX_ORDER(0, 2)) | |
51 | ||
87fb4b7b ED |
52 | /* return minimum truesize of one skb containing X bytes of data */ |
53 | #define SKB_TRUESIZE(X) ((X) + \ | |
54 | SKB_DATA_ALIGN(sizeof(struct sk_buff)) + \ | |
55 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) | |
56 | ||
1da177e4 LT |
57 | /* A. Checksumming of received packets by device. |
58 | * | |
59 | * NONE: device failed to checksum this packet. | |
60 | * skb->csum is undefined. | |
61 | * | |
62 | * UNNECESSARY: device parsed packet and wouldbe verified checksum. | |
63 | * skb->csum is undefined. | |
64 | * It is bad option, but, unfortunately, many of vendors do this. | |
65 | * Apparently with secret goal to sell you new device, when you | |
66 | * will add new protocol to your host. F.e. IPv6. 8) | |
67 | * | |
84fa7933 | 68 | * COMPLETE: the most generic way. Device supplied checksum of _all_ |
1da177e4 LT |
69 | * the packet as seen by netif_rx in skb->csum. |
70 | * NOTE: Even if device supports only some protocols, but | |
84fa7933 | 71 | * is able to produce some skb->csum, it MUST use COMPLETE, |
1da177e4 LT |
72 | * not UNNECESSARY. |
73 | * | |
c6c6e3e0 HX |
74 | * PARTIAL: identical to the case for output below. This may occur |
75 | * on a packet received directly from another Linux OS, e.g., | |
76 | * a virtualised Linux kernel on the same host. The packet can | |
77 | * be treated in the same way as UNNECESSARY except that on | |
78 | * output (i.e., forwarding) the checksum must be filled in | |
79 | * by the OS or the hardware. | |
80 | * | |
1da177e4 LT |
81 | * B. Checksumming on output. |
82 | * | |
83 | * NONE: skb is checksummed by protocol or csum is not required. | |
84 | * | |
84fa7933 | 85 | * PARTIAL: device is required to csum packet as seen by hard_start_xmit |
c6c6e3e0 HX |
86 | * from skb->csum_start to the end and to record the checksum |
87 | * at skb->csum_start + skb->csum_offset. | |
1da177e4 LT |
88 | * |
89 | * Device must show its capabilities in dev->features, set | |
90 | * at device setup time. | |
91 | * NETIF_F_HW_CSUM - it is clever device, it is able to checksum | |
92 | * everything. | |
1da177e4 LT |
93 | * NETIF_F_IP_CSUM - device is dumb. It is able to csum only |
94 | * TCP/UDP over IPv4. Sigh. Vendors like this | |
95 | * way by an unknown reason. Though, see comment above | |
96 | * about CHECKSUM_UNNECESSARY. 8) | |
c6c6e3e0 | 97 | * NETIF_F_IPV6_CSUM about as dumb as the last one but does IPv6 instead. |
1da177e4 | 98 | * |
3af79302 YZ |
99 | * UNNECESSARY: device will do per protocol specific csum. Protocol drivers |
100 | * that do not want net to perform the checksum calculation should use | |
101 | * this flag in their outgoing skbs. | |
102 | * NETIF_F_FCOE_CRC this indicates the device can do FCoE FC CRC | |
103 | * offload. Correspondingly, the FCoE protocol driver | |
104 | * stack should use CHECKSUM_UNNECESSARY. | |
105 | * | |
1da177e4 LT |
106 | * Any questions? No questions, good. --ANK |
107 | */ | |
108 | ||
1da177e4 | 109 | struct net_device; |
716ea3a7 | 110 | struct scatterlist; |
9c55e01c | 111 | struct pipe_inode_info; |
1da177e4 | 112 | |
5f79e0f9 | 113 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
1da177e4 LT |
114 | struct nf_conntrack { |
115 | atomic_t use; | |
1da177e4 | 116 | }; |
5f79e0f9 | 117 | #endif |
1da177e4 LT |
118 | |
119 | #ifdef CONFIG_BRIDGE_NETFILTER | |
120 | struct nf_bridge_info { | |
bf1ac5ca ED |
121 | atomic_t use; |
122 | unsigned int mask; | |
123 | struct net_device *physindev; | |
124 | struct net_device *physoutdev; | |
125 | unsigned long data[32 / sizeof(unsigned long)]; | |
1da177e4 LT |
126 | }; |
127 | #endif | |
128 | ||
1da177e4 LT |
129 | struct sk_buff_head { |
130 | /* These two members must be first. */ | |
131 | struct sk_buff *next; | |
132 | struct sk_buff *prev; | |
133 | ||
134 | __u32 qlen; | |
135 | spinlock_t lock; | |
136 | }; | |
137 | ||
138 | struct sk_buff; | |
139 | ||
9d4dde52 IC |
140 | /* To allow 64K frame to be packed as single skb without frag_list we |
141 | * require 64K/PAGE_SIZE pages plus 1 additional page to allow for | |
142 | * buffers which do not start on a page boundary. | |
143 | * | |
144 | * Since GRO uses frags we allocate at least 16 regardless of page | |
145 | * size. | |
a715dea3 | 146 | */ |
9d4dde52 | 147 | #if (65536/PAGE_SIZE + 1) < 16 |
eec00954 | 148 | #define MAX_SKB_FRAGS 16UL |
a715dea3 | 149 | #else |
9d4dde52 | 150 | #define MAX_SKB_FRAGS (65536/PAGE_SIZE + 1) |
a715dea3 | 151 | #endif |
1da177e4 LT |
152 | |
153 | typedef struct skb_frag_struct skb_frag_t; | |
154 | ||
155 | struct skb_frag_struct { | |
a8605c60 IC |
156 | struct { |
157 | struct page *p; | |
158 | } page; | |
cb4dfe56 | 159 | #if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536) |
a309bb07 DM |
160 | __u32 page_offset; |
161 | __u32 size; | |
cb4dfe56 ED |
162 | #else |
163 | __u16 page_offset; | |
164 | __u16 size; | |
165 | #endif | |
1da177e4 LT |
166 | }; |
167 | ||
9e903e08 ED |
168 | static inline unsigned int skb_frag_size(const skb_frag_t *frag) |
169 | { | |
170 | return frag->size; | |
171 | } | |
172 | ||
173 | static inline void skb_frag_size_set(skb_frag_t *frag, unsigned int size) | |
174 | { | |
175 | frag->size = size; | |
176 | } | |
177 | ||
178 | static inline void skb_frag_size_add(skb_frag_t *frag, int delta) | |
179 | { | |
180 | frag->size += delta; | |
181 | } | |
182 | ||
183 | static inline void skb_frag_size_sub(skb_frag_t *frag, int delta) | |
184 | { | |
185 | frag->size -= delta; | |
186 | } | |
187 | ||
ac45f602 PO |
188 | #define HAVE_HW_TIME_STAMP |
189 | ||
190 | /** | |
d3a21be8 | 191 | * struct skb_shared_hwtstamps - hardware time stamps |
ac45f602 PO |
192 | * @hwtstamp: hardware time stamp transformed into duration |
193 | * since arbitrary point in time | |
194 | * @syststamp: hwtstamp transformed to system time base | |
195 | * | |
196 | * Software time stamps generated by ktime_get_real() are stored in | |
197 | * skb->tstamp. The relation between the different kinds of time | |
198 | * stamps is as follows: | |
199 | * | |
200 | * syststamp and tstamp can be compared against each other in | |
201 | * arbitrary combinations. The accuracy of a | |
202 | * syststamp/tstamp/"syststamp from other device" comparison is | |
203 | * limited by the accuracy of the transformation into system time | |
204 | * base. This depends on the device driver and its underlying | |
205 | * hardware. | |
206 | * | |
207 | * hwtstamps can only be compared against other hwtstamps from | |
208 | * the same device. | |
209 | * | |
210 | * This structure is attached to packets as part of the | |
211 | * &skb_shared_info. Use skb_hwtstamps() to get a pointer. | |
212 | */ | |
213 | struct skb_shared_hwtstamps { | |
214 | ktime_t hwtstamp; | |
215 | ktime_t syststamp; | |
216 | }; | |
217 | ||
2244d07b OH |
218 | /* Definitions for tx_flags in struct skb_shared_info */ |
219 | enum { | |
220 | /* generate hardware time stamp */ | |
221 | SKBTX_HW_TSTAMP = 1 << 0, | |
222 | ||
223 | /* generate software time stamp */ | |
224 | SKBTX_SW_TSTAMP = 1 << 1, | |
225 | ||
226 | /* device driver is going to provide hardware time stamp */ | |
227 | SKBTX_IN_PROGRESS = 1 << 2, | |
228 | ||
a6686f2f | 229 | /* device driver supports TX zero-copy buffers */ |
62b1a8ab | 230 | SKBTX_DEV_ZEROCOPY = 1 << 3, |
6e3e939f JB |
231 | |
232 | /* generate wifi status information (where possible) */ | |
62b1a8ab | 233 | SKBTX_WIFI_STATUS = 1 << 4, |
c9af6db4 PS |
234 | |
235 | /* This indicates at least one fragment might be overwritten | |
236 | * (as in vmsplice(), sendfile() ...) | |
237 | * If we need to compute a TX checksum, we'll need to copy | |
238 | * all frags to avoid possible bad checksum | |
239 | */ | |
240 | SKBTX_SHARED_FRAG = 1 << 5, | |
a6686f2f SM |
241 | }; |
242 | ||
243 | /* | |
244 | * The callback notifies userspace to release buffers when skb DMA is done in | |
245 | * lower device, the skb last reference should be 0 when calling this. | |
e19d6763 MT |
246 | * The zerocopy_success argument is true if zero copy transmit occurred, |
247 | * false on data copy or out of memory error caused by data copy attempt. | |
ca8f4fb2 MT |
248 | * The ctx field is used to track device context. |
249 | * The desc field is used to track userspace buffer index. | |
a6686f2f SM |
250 | */ |
251 | struct ubuf_info { | |
e19d6763 | 252 | void (*callback)(struct ubuf_info *, bool zerocopy_success); |
ca8f4fb2 | 253 | void *ctx; |
a6686f2f | 254 | unsigned long desc; |
ac45f602 PO |
255 | }; |
256 | ||
1da177e4 LT |
257 | /* This data is invariant across clones and lives at |
258 | * the end of the header data, ie. at skb->end. | |
259 | */ | |
260 | struct skb_shared_info { | |
9f42f126 IC |
261 | unsigned char nr_frags; |
262 | __u8 tx_flags; | |
7967168c HX |
263 | unsigned short gso_size; |
264 | /* Warning: this field is not always filled in (UFO)! */ | |
265 | unsigned short gso_segs; | |
266 | unsigned short gso_type; | |
1da177e4 | 267 | struct sk_buff *frag_list; |
ac45f602 | 268 | struct skb_shared_hwtstamps hwtstamps; |
9f42f126 | 269 | __be32 ip6_frag_id; |
ec7d2f2c ED |
270 | |
271 | /* | |
272 | * Warning : all fields before dataref are cleared in __alloc_skb() | |
273 | */ | |
274 | atomic_t dataref; | |
275 | ||
69e3c75f JB |
276 | /* Intermediate layers must ensure that destructor_arg |
277 | * remains valid until skb destructor */ | |
278 | void * destructor_arg; | |
a6686f2f | 279 | |
fed66381 ED |
280 | /* must be last field, see pskb_expand_head() */ |
281 | skb_frag_t frags[MAX_SKB_FRAGS]; | |
1da177e4 LT |
282 | }; |
283 | ||
284 | /* We divide dataref into two halves. The higher 16 bits hold references | |
285 | * to the payload part of skb->data. The lower 16 bits hold references to | |
334a8132 PM |
286 | * the entire skb->data. A clone of a headerless skb holds the length of |
287 | * the header in skb->hdr_len. | |
1da177e4 LT |
288 | * |
289 | * All users must obey the rule that the skb->data reference count must be | |
290 | * greater than or equal to the payload reference count. | |
291 | * | |
292 | * Holding a reference to the payload part means that the user does not | |
293 | * care about modifications to the header part of skb->data. | |
294 | */ | |
295 | #define SKB_DATAREF_SHIFT 16 | |
296 | #define SKB_DATAREF_MASK ((1 << SKB_DATAREF_SHIFT) - 1) | |
297 | ||
d179cd12 DM |
298 | |
299 | enum { | |
300 | SKB_FCLONE_UNAVAILABLE, | |
301 | SKB_FCLONE_ORIG, | |
302 | SKB_FCLONE_CLONE, | |
303 | }; | |
304 | ||
7967168c HX |
305 | enum { |
306 | SKB_GSO_TCPV4 = 1 << 0, | |
f83ef8c0 | 307 | SKB_GSO_UDP = 1 << 1, |
576a30eb HX |
308 | |
309 | /* This indicates the skb is from an untrusted source. */ | |
310 | SKB_GSO_DODGY = 1 << 2, | |
b0da8537 MC |
311 | |
312 | /* This indicates the tcp segment has CWR set. */ | |
f83ef8c0 HX |
313 | SKB_GSO_TCP_ECN = 1 << 3, |
314 | ||
315 | SKB_GSO_TCPV6 = 1 << 4, | |
01d5b2fc CL |
316 | |
317 | SKB_GSO_FCOE = 1 << 5, | |
68c33163 PS |
318 | |
319 | SKB_GSO_GRE = 1 << 6, | |
73136267 | 320 | |
cb32f511 | 321 | SKB_GSO_IPIP = 1 << 7, |
0d89d203 | 322 | |
61c1db7f | 323 | SKB_GSO_SIT = 1 << 8, |
cb32f511 | 324 | |
61c1db7f ED |
325 | SKB_GSO_UDP_TUNNEL = 1 << 9, |
326 | ||
327 | SKB_GSO_MPLS = 1 << 10, | |
7967168c HX |
328 | }; |
329 | ||
2e07fa9c ACM |
330 | #if BITS_PER_LONG > 32 |
331 | #define NET_SKBUFF_DATA_USES_OFFSET 1 | |
332 | #endif | |
333 | ||
334 | #ifdef NET_SKBUFF_DATA_USES_OFFSET | |
335 | typedef unsigned int sk_buff_data_t; | |
336 | #else | |
337 | typedef unsigned char *sk_buff_data_t; | |
338 | #endif | |
339 | ||
1da177e4 LT |
340 | /** |
341 | * struct sk_buff - socket buffer | |
342 | * @next: Next buffer in list | |
343 | * @prev: Previous buffer in list | |
325ed823 | 344 | * @tstamp: Time we arrived |
d84e0bd7 | 345 | * @sk: Socket we are owned by |
1da177e4 | 346 | * @dev: Device we arrived on/are leaving by |
d84e0bd7 | 347 | * @cb: Control buffer. Free for use by every layer. Put private vars here |
7fee226a | 348 | * @_skb_refdst: destination entry (with norefcount bit) |
67be2dd1 | 349 | * @sp: the security path, used for xfrm |
1da177e4 LT |
350 | * @len: Length of actual data |
351 | * @data_len: Data length | |
352 | * @mac_len: Length of link layer header | |
334a8132 | 353 | * @hdr_len: writable header length of cloned skb |
663ead3b HX |
354 | * @csum: Checksum (must include start/offset pair) |
355 | * @csum_start: Offset from skb->head where checksumming should start | |
356 | * @csum_offset: Offset from csum_start where checksum should be stored | |
d84e0bd7 | 357 | * @priority: Packet queueing priority |
67be2dd1 | 358 | * @local_df: allow local fragmentation |
1da177e4 | 359 | * @cloned: Head may be cloned (check refcnt to be sure) |
d84e0bd7 | 360 | * @ip_summed: Driver fed us an IP checksum |
1da177e4 | 361 | * @nohdr: Payload reference only, must not modify header |
d84e0bd7 | 362 | * @nfctinfo: Relationship of this skb to the connection |
1da177e4 | 363 | * @pkt_type: Packet class |
c83c2486 | 364 | * @fclone: skbuff clone status |
c83c2486 | 365 | * @ipvs_property: skbuff is owned by ipvs |
31729363 RD |
366 | * @peeked: this packet has been seen already, so stats have been |
367 | * done for it, don't do them again | |
ba9dda3a | 368 | * @nf_trace: netfilter packet trace flag |
d84e0bd7 DB |
369 | * @protocol: Packet protocol from driver |
370 | * @destructor: Destruct function | |
371 | * @nfct: Associated connection, if any | |
1da177e4 | 372 | * @nf_bridge: Saved data about a bridged frame - see br_netfilter.c |
8964be4a | 373 | * @skb_iif: ifindex of device we arrived on |
1da177e4 LT |
374 | * @tc_index: Traffic control index |
375 | * @tc_verd: traffic control verdict | |
d84e0bd7 DB |
376 | * @rxhash: the packet hash computed on receive |
377 | * @queue_mapping: Queue mapping for multiqueue devices | |
553a5672 | 378 | * @ndisc_nodetype: router type (from link layer) |
d84e0bd7 | 379 | * @ooo_okay: allow the mapping of a socket to a queue to be changed |
4ca2462e CG |
380 | * @l4_rxhash: indicate rxhash is a canonical 4-tuple hash over transport |
381 | * ports. | |
6e3e939f JB |
382 | * @wifi_acked_valid: wifi_acked was set |
383 | * @wifi_acked: whether frame was acked on wifi or not | |
3bdc0eba | 384 | * @no_fcs: Request NIC to treat last 4 bytes as Ethernet FCS |
f4b8ea78 RD |
385 | * @dma_cookie: a cookie to one of several possible DMA operations |
386 | * done by skb DMA functions | |
06021292 | 387 | * @napi_id: id of the NAPI struct this skb came from |
984bc16c | 388 | * @secmark: security marking |
d84e0bd7 DB |
389 | * @mark: Generic packet mark |
390 | * @dropcount: total number of sk_receive_queue overflows | |
86a9bad3 | 391 | * @vlan_proto: vlan encapsulation protocol |
6aa895b0 | 392 | * @vlan_tci: vlan tag control information |
0d89d203 | 393 | * @inner_protocol: Protocol (encapsulation) |
6a674e9c JG |
394 | * @inner_transport_header: Inner transport layer header (encapsulation) |
395 | * @inner_network_header: Network layer header (encapsulation) | |
aefbd2b3 | 396 | * @inner_mac_header: Link layer header (encapsulation) |
d84e0bd7 DB |
397 | * @transport_header: Transport layer header |
398 | * @network_header: Network layer header | |
399 | * @mac_header: Link layer header | |
400 | * @tail: Tail pointer | |
401 | * @end: End pointer | |
402 | * @head: Head of buffer | |
403 | * @data: Data head pointer | |
404 | * @truesize: Buffer size | |
405 | * @users: User count - see {datagram,tcp}.c | |
1da177e4 LT |
406 | */ |
407 | ||
408 | struct sk_buff { | |
409 | /* These two members must be first. */ | |
410 | struct sk_buff *next; | |
411 | struct sk_buff *prev; | |
412 | ||
b7aa0bf7 | 413 | ktime_t tstamp; |
da3f5cf1 FF |
414 | |
415 | struct sock *sk; | |
1da177e4 | 416 | struct net_device *dev; |
1da177e4 | 417 | |
1da177e4 LT |
418 | /* |
419 | * This is the control buffer. It is free to use for every | |
420 | * layer. Please put your private variables there. If you | |
421 | * want to keep them across layers you have to do a skb_clone() | |
422 | * first. This is owned by whoever has the skb queued ATM. | |
423 | */ | |
da3f5cf1 | 424 | char cb[48] __aligned(8); |
1da177e4 | 425 | |
7fee226a | 426 | unsigned long _skb_refdst; |
da3f5cf1 FF |
427 | #ifdef CONFIG_XFRM |
428 | struct sec_path *sp; | |
429 | #endif | |
1da177e4 | 430 | unsigned int len, |
334a8132 PM |
431 | data_len; |
432 | __u16 mac_len, | |
433 | hdr_len; | |
ff1dcadb AV |
434 | union { |
435 | __wsum csum; | |
663ead3b HX |
436 | struct { |
437 | __u16 csum_start; | |
438 | __u16 csum_offset; | |
439 | }; | |
ff1dcadb | 440 | }; |
1da177e4 | 441 | __u32 priority; |
fe55f6d5 | 442 | kmemcheck_bitfield_begin(flags1); |
1cbb3380 TG |
443 | __u8 local_df:1, |
444 | cloned:1, | |
445 | ip_summed:2, | |
6869c4d8 HW |
446 | nohdr:1, |
447 | nfctinfo:3; | |
d179cd12 | 448 | __u8 pkt_type:3, |
b84f4cc9 | 449 | fclone:2, |
ba9dda3a | 450 | ipvs_property:1, |
a59322be | 451 | peeked:1, |
ba9dda3a | 452 | nf_trace:1; |
fe55f6d5 | 453 | kmemcheck_bitfield_end(flags1); |
4ab408de | 454 | __be16 protocol; |
1da177e4 LT |
455 | |
456 | void (*destructor)(struct sk_buff *skb); | |
9fb9cbb1 | 457 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
5f79e0f9 | 458 | struct nf_conntrack *nfct; |
2fc72c7b | 459 | #endif |
1da177e4 LT |
460 | #ifdef CONFIG_BRIDGE_NETFILTER |
461 | struct nf_bridge_info *nf_bridge; | |
462 | #endif | |
f25f4e44 | 463 | |
8964be4a | 464 | int skb_iif; |
4031ae6e AD |
465 | |
466 | __u32 rxhash; | |
467 | ||
86a9bad3 | 468 | __be16 vlan_proto; |
4031ae6e AD |
469 | __u16 vlan_tci; |
470 | ||
1da177e4 | 471 | #ifdef CONFIG_NET_SCHED |
b6b99eb5 | 472 | __u16 tc_index; /* traffic control index */ |
1da177e4 | 473 | #ifdef CONFIG_NET_CLS_ACT |
b6b99eb5 | 474 | __u16 tc_verd; /* traffic control verdict */ |
1da177e4 | 475 | #endif |
1da177e4 | 476 | #endif |
fe55f6d5 | 477 | |
0a14842f | 478 | __u16 queue_mapping; |
fe55f6d5 | 479 | kmemcheck_bitfield_begin(flags2); |
de357cc0 | 480 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
8a4eb573 | 481 | __u8 ndisc_nodetype:2; |
d0f09804 | 482 | #endif |
c93bdd0e | 483 | __u8 pfmemalloc:1; |
3853b584 | 484 | __u8 ooo_okay:1; |
bdeab991 | 485 | __u8 l4_rxhash:1; |
6e3e939f JB |
486 | __u8 wifi_acked_valid:1; |
487 | __u8 wifi_acked:1; | |
3bdc0eba | 488 | __u8 no_fcs:1; |
d3836f21 | 489 | __u8 head_frag:1; |
6a674e9c JG |
490 | /* Encapsulation protocol and NIC drivers should use |
491 | * this flag to indicate to each other if the skb contains | |
492 | * encapsulated packet or not and maybe use the inner packet | |
493 | * headers if needed | |
494 | */ | |
495 | __u8 encapsulation:1; | |
45906723 | 496 | /* 6/8 bit hole (depending on ndisc_nodetype presence) */ |
fe55f6d5 VN |
497 | kmemcheck_bitfield_end(flags2); |
498 | ||
e0d1095a | 499 | #if defined CONFIG_NET_DMA || defined CONFIG_NET_RX_BUSY_POLL |
06021292 ET |
500 | union { |
501 | unsigned int napi_id; | |
502 | dma_cookie_t dma_cookie; | |
503 | }; | |
97fc2f08 | 504 | #endif |
984bc16c JM |
505 | #ifdef CONFIG_NETWORK_SECMARK |
506 | __u32 secmark; | |
507 | #endif | |
3b885787 NH |
508 | union { |
509 | __u32 mark; | |
510 | __u32 dropcount; | |
16fad69c | 511 | __u32 reserved_tailroom; |
3b885787 | 512 | }; |
1da177e4 | 513 | |
0d89d203 | 514 | __be16 inner_protocol; |
1a37e412 SH |
515 | __u16 inner_transport_header; |
516 | __u16 inner_network_header; | |
517 | __u16 inner_mac_header; | |
518 | __u16 transport_header; | |
519 | __u16 network_header; | |
520 | __u16 mac_header; | |
1da177e4 | 521 | /* These elements must be at the end, see alloc_skb() for details. */ |
27a884dc | 522 | sk_buff_data_t tail; |
4305b541 | 523 | sk_buff_data_t end; |
1da177e4 | 524 | unsigned char *head, |
4305b541 | 525 | *data; |
27a884dc ACM |
526 | unsigned int truesize; |
527 | atomic_t users; | |
1da177e4 LT |
528 | }; |
529 | ||
530 | #ifdef __KERNEL__ | |
531 | /* | |
532 | * Handling routines are only of interest to the kernel | |
533 | */ | |
534 | #include <linux/slab.h> | |
535 | ||
1da177e4 | 536 | |
c93bdd0e MG |
537 | #define SKB_ALLOC_FCLONE 0x01 |
538 | #define SKB_ALLOC_RX 0x02 | |
539 | ||
540 | /* Returns true if the skb was allocated from PFMEMALLOC reserves */ | |
541 | static inline bool skb_pfmemalloc(const struct sk_buff *skb) | |
542 | { | |
543 | return unlikely(skb->pfmemalloc); | |
544 | } | |
545 | ||
7fee226a ED |
546 | /* |
547 | * skb might have a dst pointer attached, refcounted or not. | |
548 | * _skb_refdst low order bit is set if refcount was _not_ taken | |
549 | */ | |
550 | #define SKB_DST_NOREF 1UL | |
551 | #define SKB_DST_PTRMASK ~(SKB_DST_NOREF) | |
552 | ||
553 | /** | |
554 | * skb_dst - returns skb dst_entry | |
555 | * @skb: buffer | |
556 | * | |
557 | * Returns skb dst_entry, regardless of reference taken or not. | |
558 | */ | |
adf30907 ED |
559 | static inline struct dst_entry *skb_dst(const struct sk_buff *skb) |
560 | { | |
7fee226a ED |
561 | /* If refdst was not refcounted, check we still are in a |
562 | * rcu_read_lock section | |
563 | */ | |
564 | WARN_ON((skb->_skb_refdst & SKB_DST_NOREF) && | |
565 | !rcu_read_lock_held() && | |
566 | !rcu_read_lock_bh_held()); | |
567 | return (struct dst_entry *)(skb->_skb_refdst & SKB_DST_PTRMASK); | |
adf30907 ED |
568 | } |
569 | ||
7fee226a ED |
570 | /** |
571 | * skb_dst_set - sets skb dst | |
572 | * @skb: buffer | |
573 | * @dst: dst entry | |
574 | * | |
575 | * Sets skb dst, assuming a reference was taken on dst and should | |
576 | * be released by skb_dst_drop() | |
577 | */ | |
adf30907 ED |
578 | static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst) |
579 | { | |
7fee226a ED |
580 | skb->_skb_refdst = (unsigned long)dst; |
581 | } | |
582 | ||
7965bd4d JP |
583 | void __skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst, |
584 | bool force); | |
932bc4d7 JA |
585 | |
586 | /** | |
587 | * skb_dst_set_noref - sets skb dst, hopefully, without taking reference | |
588 | * @skb: buffer | |
589 | * @dst: dst entry | |
590 | * | |
591 | * Sets skb dst, assuming a reference was not taken on dst. | |
592 | * If dst entry is cached, we do not take reference and dst_release | |
593 | * will be avoided by refdst_drop. If dst entry is not cached, we take | |
594 | * reference, so that last dst_release can destroy the dst immediately. | |
595 | */ | |
596 | static inline void skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst) | |
597 | { | |
598 | __skb_dst_set_noref(skb, dst, false); | |
599 | } | |
600 | ||
601 | /** | |
602 | * skb_dst_set_noref_force - sets skb dst, without taking reference | |
603 | * @skb: buffer | |
604 | * @dst: dst entry | |
605 | * | |
606 | * Sets skb dst, assuming a reference was not taken on dst. | |
607 | * No reference is taken and no dst_release will be called. While for | |
608 | * cached dsts deferred reclaim is a basic feature, for entries that are | |
609 | * not cached it is caller's job to guarantee that last dst_release for | |
610 | * provided dst happens when nobody uses it, eg. after a RCU grace period. | |
611 | */ | |
612 | static inline void skb_dst_set_noref_force(struct sk_buff *skb, | |
613 | struct dst_entry *dst) | |
614 | { | |
615 | __skb_dst_set_noref(skb, dst, true); | |
616 | } | |
7fee226a ED |
617 | |
618 | /** | |
25985edc | 619 | * skb_dst_is_noref - Test if skb dst isn't refcounted |
7fee226a ED |
620 | * @skb: buffer |
621 | */ | |
622 | static inline bool skb_dst_is_noref(const struct sk_buff *skb) | |
623 | { | |
624 | return (skb->_skb_refdst & SKB_DST_NOREF) && skb_dst(skb); | |
adf30907 ED |
625 | } |
626 | ||
511c3f92 ED |
627 | static inline struct rtable *skb_rtable(const struct sk_buff *skb) |
628 | { | |
adf30907 | 629 | return (struct rtable *)skb_dst(skb); |
511c3f92 ED |
630 | } |
631 | ||
7965bd4d JP |
632 | void kfree_skb(struct sk_buff *skb); |
633 | void kfree_skb_list(struct sk_buff *segs); | |
634 | void skb_tx_error(struct sk_buff *skb); | |
635 | void consume_skb(struct sk_buff *skb); | |
636 | void __kfree_skb(struct sk_buff *skb); | |
d7e8883c | 637 | extern struct kmem_cache *skbuff_head_cache; |
bad43ca8 | 638 | |
7965bd4d JP |
639 | void kfree_skb_partial(struct sk_buff *skb, bool head_stolen); |
640 | bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from, | |
641 | bool *fragstolen, int *delta_truesize); | |
bad43ca8 | 642 | |
7965bd4d JP |
643 | struct sk_buff *__alloc_skb(unsigned int size, gfp_t priority, int flags, |
644 | int node); | |
645 | struct sk_buff *build_skb(void *data, unsigned int frag_size); | |
d179cd12 | 646 | static inline struct sk_buff *alloc_skb(unsigned int size, |
dd0fc66f | 647 | gfp_t priority) |
d179cd12 | 648 | { |
564824b0 | 649 | return __alloc_skb(size, priority, 0, NUMA_NO_NODE); |
d179cd12 DM |
650 | } |
651 | ||
652 | static inline struct sk_buff *alloc_skb_fclone(unsigned int size, | |
dd0fc66f | 653 | gfp_t priority) |
d179cd12 | 654 | { |
c93bdd0e | 655 | return __alloc_skb(size, priority, SKB_ALLOC_FCLONE, NUMA_NO_NODE); |
d179cd12 DM |
656 | } |
657 | ||
7965bd4d | 658 | struct sk_buff *__alloc_skb_head(gfp_t priority, int node); |
0ebd0ac5 PM |
659 | static inline struct sk_buff *alloc_skb_head(gfp_t priority) |
660 | { | |
661 | return __alloc_skb_head(priority, -1); | |
662 | } | |
663 | ||
7965bd4d JP |
664 | struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src); |
665 | int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask); | |
666 | struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t priority); | |
667 | struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t priority); | |
668 | struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom, gfp_t gfp_mask); | |
669 | ||
670 | int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail, gfp_t gfp_mask); | |
671 | struct sk_buff *skb_realloc_headroom(struct sk_buff *skb, | |
672 | unsigned int headroom); | |
673 | struct sk_buff *skb_copy_expand(const struct sk_buff *skb, int newheadroom, | |
674 | int newtailroom, gfp_t priority); | |
675 | int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, | |
676 | int len); | |
677 | int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer); | |
678 | int skb_pad(struct sk_buff *skb, int pad); | |
ead2ceb0 | 679 | #define dev_kfree_skb(a) consume_skb(a) |
1da177e4 | 680 | |
7965bd4d JP |
681 | int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb, |
682 | int getfrag(void *from, char *to, int offset, | |
683 | int len, int odd, struct sk_buff *skb), | |
684 | void *from, int length); | |
e89e9cf5 | 685 | |
d94d9fee | 686 | struct skb_seq_state { |
677e90ed TG |
687 | __u32 lower_offset; |
688 | __u32 upper_offset; | |
689 | __u32 frag_idx; | |
690 | __u32 stepped_offset; | |
691 | struct sk_buff *root_skb; | |
692 | struct sk_buff *cur_skb; | |
693 | __u8 *frag_data; | |
694 | }; | |
695 | ||
7965bd4d JP |
696 | void skb_prepare_seq_read(struct sk_buff *skb, unsigned int from, |
697 | unsigned int to, struct skb_seq_state *st); | |
698 | unsigned int skb_seq_read(unsigned int consumed, const u8 **data, | |
699 | struct skb_seq_state *st); | |
700 | void skb_abort_seq_read(struct skb_seq_state *st); | |
677e90ed | 701 | |
7965bd4d JP |
702 | unsigned int skb_find_text(struct sk_buff *skb, unsigned int from, |
703 | unsigned int to, struct ts_config *config, | |
704 | struct ts_state *state); | |
3fc7e8a6 | 705 | |
7965bd4d | 706 | void __skb_get_rxhash(struct sk_buff *skb); |
bfb564e7 KK |
707 | static inline __u32 skb_get_rxhash(struct sk_buff *skb) |
708 | { | |
ecd5cf5d | 709 | if (!skb->l4_rxhash) |
bdeab991 | 710 | __skb_get_rxhash(skb); |
bfb564e7 KK |
711 | |
712 | return skb->rxhash; | |
713 | } | |
714 | ||
4305b541 ACM |
715 | #ifdef NET_SKBUFF_DATA_USES_OFFSET |
716 | static inline unsigned char *skb_end_pointer(const struct sk_buff *skb) | |
717 | { | |
718 | return skb->head + skb->end; | |
719 | } | |
ec47ea82 AD |
720 | |
721 | static inline unsigned int skb_end_offset(const struct sk_buff *skb) | |
722 | { | |
723 | return skb->end; | |
724 | } | |
4305b541 ACM |
725 | #else |
726 | static inline unsigned char *skb_end_pointer(const struct sk_buff *skb) | |
727 | { | |
728 | return skb->end; | |
729 | } | |
ec47ea82 AD |
730 | |
731 | static inline unsigned int skb_end_offset(const struct sk_buff *skb) | |
732 | { | |
733 | return skb->end - skb->head; | |
734 | } | |
4305b541 ACM |
735 | #endif |
736 | ||
1da177e4 | 737 | /* Internal */ |
4305b541 | 738 | #define skb_shinfo(SKB) ((struct skb_shared_info *)(skb_end_pointer(SKB))) |
1da177e4 | 739 | |
ac45f602 PO |
740 | static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb) |
741 | { | |
742 | return &skb_shinfo(skb)->hwtstamps; | |
743 | } | |
744 | ||
1da177e4 LT |
745 | /** |
746 | * skb_queue_empty - check if a queue is empty | |
747 | * @list: queue head | |
748 | * | |
749 | * Returns true if the queue is empty, false otherwise. | |
750 | */ | |
751 | static inline int skb_queue_empty(const struct sk_buff_head *list) | |
752 | { | |
753 | return list->next == (struct sk_buff *)list; | |
754 | } | |
755 | ||
fc7ebb21 DM |
756 | /** |
757 | * skb_queue_is_last - check if skb is the last entry in the queue | |
758 | * @list: queue head | |
759 | * @skb: buffer | |
760 | * | |
761 | * Returns true if @skb is the last buffer on the list. | |
762 | */ | |
763 | static inline bool skb_queue_is_last(const struct sk_buff_head *list, | |
764 | const struct sk_buff *skb) | |
765 | { | |
a02cec21 | 766 | return skb->next == (struct sk_buff *)list; |
fc7ebb21 DM |
767 | } |
768 | ||
832d11c5 IJ |
769 | /** |
770 | * skb_queue_is_first - check if skb is the first entry in the queue | |
771 | * @list: queue head | |
772 | * @skb: buffer | |
773 | * | |
774 | * Returns true if @skb is the first buffer on the list. | |
775 | */ | |
776 | static inline bool skb_queue_is_first(const struct sk_buff_head *list, | |
777 | const struct sk_buff *skb) | |
778 | { | |
a02cec21 | 779 | return skb->prev == (struct sk_buff *)list; |
832d11c5 IJ |
780 | } |
781 | ||
249c8b42 DM |
782 | /** |
783 | * skb_queue_next - return the next packet in the queue | |
784 | * @list: queue head | |
785 | * @skb: current buffer | |
786 | * | |
787 | * Return the next packet in @list after @skb. It is only valid to | |
788 | * call this if skb_queue_is_last() evaluates to false. | |
789 | */ | |
790 | static inline struct sk_buff *skb_queue_next(const struct sk_buff_head *list, | |
791 | const struct sk_buff *skb) | |
792 | { | |
793 | /* This BUG_ON may seem severe, but if we just return then we | |
794 | * are going to dereference garbage. | |
795 | */ | |
796 | BUG_ON(skb_queue_is_last(list, skb)); | |
797 | return skb->next; | |
798 | } | |
799 | ||
832d11c5 IJ |
800 | /** |
801 | * skb_queue_prev - return the prev packet in the queue | |
802 | * @list: queue head | |
803 | * @skb: current buffer | |
804 | * | |
805 | * Return the prev packet in @list before @skb. It is only valid to | |
806 | * call this if skb_queue_is_first() evaluates to false. | |
807 | */ | |
808 | static inline struct sk_buff *skb_queue_prev(const struct sk_buff_head *list, | |
809 | const struct sk_buff *skb) | |
810 | { | |
811 | /* This BUG_ON may seem severe, but if we just return then we | |
812 | * are going to dereference garbage. | |
813 | */ | |
814 | BUG_ON(skb_queue_is_first(list, skb)); | |
815 | return skb->prev; | |
816 | } | |
817 | ||
1da177e4 LT |
818 | /** |
819 | * skb_get - reference buffer | |
820 | * @skb: buffer to reference | |
821 | * | |
822 | * Makes another reference to a socket buffer and returns a pointer | |
823 | * to the buffer. | |
824 | */ | |
825 | static inline struct sk_buff *skb_get(struct sk_buff *skb) | |
826 | { | |
827 | atomic_inc(&skb->users); | |
828 | return skb; | |
829 | } | |
830 | ||
831 | /* | |
832 | * If users == 1, we are the only owner and are can avoid redundant | |
833 | * atomic change. | |
834 | */ | |
835 | ||
1da177e4 LT |
836 | /** |
837 | * skb_cloned - is the buffer a clone | |
838 | * @skb: buffer to check | |
839 | * | |
840 | * Returns true if the buffer was generated with skb_clone() and is | |
841 | * one of multiple shared copies of the buffer. Cloned buffers are | |
842 | * shared data so must not be written to under normal circumstances. | |
843 | */ | |
844 | static inline int skb_cloned(const struct sk_buff *skb) | |
845 | { | |
846 | return skb->cloned && | |
847 | (atomic_read(&skb_shinfo(skb)->dataref) & SKB_DATAREF_MASK) != 1; | |
848 | } | |
849 | ||
14bbd6a5 PS |
850 | static inline int skb_unclone(struct sk_buff *skb, gfp_t pri) |
851 | { | |
852 | might_sleep_if(pri & __GFP_WAIT); | |
853 | ||
854 | if (skb_cloned(skb)) | |
855 | return pskb_expand_head(skb, 0, 0, pri); | |
856 | ||
857 | return 0; | |
858 | } | |
859 | ||
1da177e4 LT |
860 | /** |
861 | * skb_header_cloned - is the header a clone | |
862 | * @skb: buffer to check | |
863 | * | |
864 | * Returns true if modifying the header part of the buffer requires | |
865 | * the data to be copied. | |
866 | */ | |
867 | static inline int skb_header_cloned(const struct sk_buff *skb) | |
868 | { | |
869 | int dataref; | |
870 | ||
871 | if (!skb->cloned) | |
872 | return 0; | |
873 | ||
874 | dataref = atomic_read(&skb_shinfo(skb)->dataref); | |
875 | dataref = (dataref & SKB_DATAREF_MASK) - (dataref >> SKB_DATAREF_SHIFT); | |
876 | return dataref != 1; | |
877 | } | |
878 | ||
879 | /** | |
880 | * skb_header_release - release reference to header | |
881 | * @skb: buffer to operate on | |
882 | * | |
883 | * Drop a reference to the header part of the buffer. This is done | |
884 | * by acquiring a payload reference. You must not read from the header | |
885 | * part of skb->data after this. | |
886 | */ | |
887 | static inline void skb_header_release(struct sk_buff *skb) | |
888 | { | |
889 | BUG_ON(skb->nohdr); | |
890 | skb->nohdr = 1; | |
891 | atomic_add(1 << SKB_DATAREF_SHIFT, &skb_shinfo(skb)->dataref); | |
892 | } | |
893 | ||
894 | /** | |
895 | * skb_shared - is the buffer shared | |
896 | * @skb: buffer to check | |
897 | * | |
898 | * Returns true if more than one person has a reference to this | |
899 | * buffer. | |
900 | */ | |
901 | static inline int skb_shared(const struct sk_buff *skb) | |
902 | { | |
903 | return atomic_read(&skb->users) != 1; | |
904 | } | |
905 | ||
906 | /** | |
907 | * skb_share_check - check if buffer is shared and if so clone it | |
908 | * @skb: buffer to check | |
909 | * @pri: priority for memory allocation | |
910 | * | |
911 | * If the buffer is shared the buffer is cloned and the old copy | |
912 | * drops a reference. A new clone with a single reference is returned. | |
913 | * If the buffer is not shared the original buffer is returned. When | |
914 | * being called from interrupt status or with spinlocks held pri must | |
915 | * be GFP_ATOMIC. | |
916 | * | |
917 | * NULL is returned on a memory allocation failure. | |
918 | */ | |
47061bc4 | 919 | static inline struct sk_buff *skb_share_check(struct sk_buff *skb, gfp_t pri) |
1da177e4 LT |
920 | { |
921 | might_sleep_if(pri & __GFP_WAIT); | |
922 | if (skb_shared(skb)) { | |
923 | struct sk_buff *nskb = skb_clone(skb, pri); | |
47061bc4 ED |
924 | |
925 | if (likely(nskb)) | |
926 | consume_skb(skb); | |
927 | else | |
928 | kfree_skb(skb); | |
1da177e4 LT |
929 | skb = nskb; |
930 | } | |
931 | return skb; | |
932 | } | |
933 | ||
934 | /* | |
935 | * Copy shared buffers into a new sk_buff. We effectively do COW on | |
936 | * packets to handle cases where we have a local reader and forward | |
937 | * and a couple of other messy ones. The normal one is tcpdumping | |
938 | * a packet thats being forwarded. | |
939 | */ | |
940 | ||
941 | /** | |
942 | * skb_unshare - make a copy of a shared buffer | |
943 | * @skb: buffer to check | |
944 | * @pri: priority for memory allocation | |
945 | * | |
946 | * If the socket buffer is a clone then this function creates a new | |
947 | * copy of the data, drops a reference count on the old copy and returns | |
948 | * the new copy with the reference count at 1. If the buffer is not a clone | |
949 | * the original buffer is returned. When called with a spinlock held or | |
950 | * from interrupt state @pri must be %GFP_ATOMIC | |
951 | * | |
952 | * %NULL is returned on a memory allocation failure. | |
953 | */ | |
e2bf521d | 954 | static inline struct sk_buff *skb_unshare(struct sk_buff *skb, |
dd0fc66f | 955 | gfp_t pri) |
1da177e4 LT |
956 | { |
957 | might_sleep_if(pri & __GFP_WAIT); | |
958 | if (skb_cloned(skb)) { | |
959 | struct sk_buff *nskb = skb_copy(skb, pri); | |
960 | kfree_skb(skb); /* Free our shared copy */ | |
961 | skb = nskb; | |
962 | } | |
963 | return skb; | |
964 | } | |
965 | ||
966 | /** | |
1a5778aa | 967 | * skb_peek - peek at the head of an &sk_buff_head |
1da177e4 LT |
968 | * @list_: list to peek at |
969 | * | |
970 | * Peek an &sk_buff. Unlike most other operations you _MUST_ | |
971 | * be careful with this one. A peek leaves the buffer on the | |
972 | * list and someone else may run off with it. You must hold | |
973 | * the appropriate locks or have a private queue to do this. | |
974 | * | |
975 | * Returns %NULL for an empty list or a pointer to the head element. | |
976 | * The reference count is not incremented and the reference is therefore | |
977 | * volatile. Use with caution. | |
978 | */ | |
05bdd2f1 | 979 | static inline struct sk_buff *skb_peek(const struct sk_buff_head *list_) |
1da177e4 | 980 | { |
18d07000 ED |
981 | struct sk_buff *skb = list_->next; |
982 | ||
983 | if (skb == (struct sk_buff *)list_) | |
984 | skb = NULL; | |
985 | return skb; | |
1da177e4 LT |
986 | } |
987 | ||
da5ef6e5 PE |
988 | /** |
989 | * skb_peek_next - peek skb following the given one from a queue | |
990 | * @skb: skb to start from | |
991 | * @list_: list to peek at | |
992 | * | |
993 | * Returns %NULL when the end of the list is met or a pointer to the | |
994 | * next element. The reference count is not incremented and the | |
995 | * reference is therefore volatile. Use with caution. | |
996 | */ | |
997 | static inline struct sk_buff *skb_peek_next(struct sk_buff *skb, | |
998 | const struct sk_buff_head *list_) | |
999 | { | |
1000 | struct sk_buff *next = skb->next; | |
18d07000 | 1001 | |
da5ef6e5 PE |
1002 | if (next == (struct sk_buff *)list_) |
1003 | next = NULL; | |
1004 | return next; | |
1005 | } | |
1006 | ||
1da177e4 | 1007 | /** |
1a5778aa | 1008 | * skb_peek_tail - peek at the tail of an &sk_buff_head |
1da177e4 LT |
1009 | * @list_: list to peek at |
1010 | * | |
1011 | * Peek an &sk_buff. Unlike most other operations you _MUST_ | |
1012 | * be careful with this one. A peek leaves the buffer on the | |
1013 | * list and someone else may run off with it. You must hold | |
1014 | * the appropriate locks or have a private queue to do this. | |
1015 | * | |
1016 | * Returns %NULL for an empty list or a pointer to the tail element. | |
1017 | * The reference count is not incremented and the reference is therefore | |
1018 | * volatile. Use with caution. | |
1019 | */ | |
05bdd2f1 | 1020 | static inline struct sk_buff *skb_peek_tail(const struct sk_buff_head *list_) |
1da177e4 | 1021 | { |
18d07000 ED |
1022 | struct sk_buff *skb = list_->prev; |
1023 | ||
1024 | if (skb == (struct sk_buff *)list_) | |
1025 | skb = NULL; | |
1026 | return skb; | |
1027 | ||
1da177e4 LT |
1028 | } |
1029 | ||
1030 | /** | |
1031 | * skb_queue_len - get queue length | |
1032 | * @list_: list to measure | |
1033 | * | |
1034 | * Return the length of an &sk_buff queue. | |
1035 | */ | |
1036 | static inline __u32 skb_queue_len(const struct sk_buff_head *list_) | |
1037 | { | |
1038 | return list_->qlen; | |
1039 | } | |
1040 | ||
67fed459 DM |
1041 | /** |
1042 | * __skb_queue_head_init - initialize non-spinlock portions of sk_buff_head | |
1043 | * @list: queue to initialize | |
1044 | * | |
1045 | * This initializes only the list and queue length aspects of | |
1046 | * an sk_buff_head object. This allows to initialize the list | |
1047 | * aspects of an sk_buff_head without reinitializing things like | |
1048 | * the spinlock. It can also be used for on-stack sk_buff_head | |
1049 | * objects where the spinlock is known to not be used. | |
1050 | */ | |
1051 | static inline void __skb_queue_head_init(struct sk_buff_head *list) | |
1052 | { | |
1053 | list->prev = list->next = (struct sk_buff *)list; | |
1054 | list->qlen = 0; | |
1055 | } | |
1056 | ||
76f10ad0 AV |
1057 | /* |
1058 | * This function creates a split out lock class for each invocation; | |
1059 | * this is needed for now since a whole lot of users of the skb-queue | |
1060 | * infrastructure in drivers have different locking usage (in hardirq) | |
1061 | * than the networking core (in softirq only). In the long run either the | |
1062 | * network layer or drivers should need annotation to consolidate the | |
1063 | * main types of usage into 3 classes. | |
1064 | */ | |
1da177e4 LT |
1065 | static inline void skb_queue_head_init(struct sk_buff_head *list) |
1066 | { | |
1067 | spin_lock_init(&list->lock); | |
67fed459 | 1068 | __skb_queue_head_init(list); |
1da177e4 LT |
1069 | } |
1070 | ||
c2ecba71 PE |
1071 | static inline void skb_queue_head_init_class(struct sk_buff_head *list, |
1072 | struct lock_class_key *class) | |
1073 | { | |
1074 | skb_queue_head_init(list); | |
1075 | lockdep_set_class(&list->lock, class); | |
1076 | } | |
1077 | ||
1da177e4 | 1078 | /* |
bf299275 | 1079 | * Insert an sk_buff on a list. |
1da177e4 LT |
1080 | * |
1081 | * The "__skb_xxxx()" functions are the non-atomic ones that | |
1082 | * can only be called with interrupts disabled. | |
1083 | */ | |
7965bd4d JP |
1084 | void skb_insert(struct sk_buff *old, struct sk_buff *newsk, |
1085 | struct sk_buff_head *list); | |
bf299275 GR |
1086 | static inline void __skb_insert(struct sk_buff *newsk, |
1087 | struct sk_buff *prev, struct sk_buff *next, | |
1088 | struct sk_buff_head *list) | |
1089 | { | |
1090 | newsk->next = next; | |
1091 | newsk->prev = prev; | |
1092 | next->prev = prev->next = newsk; | |
1093 | list->qlen++; | |
1094 | } | |
1da177e4 | 1095 | |
67fed459 DM |
1096 | static inline void __skb_queue_splice(const struct sk_buff_head *list, |
1097 | struct sk_buff *prev, | |
1098 | struct sk_buff *next) | |
1099 | { | |
1100 | struct sk_buff *first = list->next; | |
1101 | struct sk_buff *last = list->prev; | |
1102 | ||
1103 | first->prev = prev; | |
1104 | prev->next = first; | |
1105 | ||
1106 | last->next = next; | |
1107 | next->prev = last; | |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * skb_queue_splice - join two skb lists, this is designed for stacks | |
1112 | * @list: the new list to add | |
1113 | * @head: the place to add it in the first list | |
1114 | */ | |
1115 | static inline void skb_queue_splice(const struct sk_buff_head *list, | |
1116 | struct sk_buff_head *head) | |
1117 | { | |
1118 | if (!skb_queue_empty(list)) { | |
1119 | __skb_queue_splice(list, (struct sk_buff *) head, head->next); | |
1d4a31dd | 1120 | head->qlen += list->qlen; |
67fed459 DM |
1121 | } |
1122 | } | |
1123 | ||
1124 | /** | |
d9619496 | 1125 | * skb_queue_splice_init - join two skb lists and reinitialise the emptied list |
67fed459 DM |
1126 | * @list: the new list to add |
1127 | * @head: the place to add it in the first list | |
1128 | * | |
1129 | * The list at @list is reinitialised | |
1130 | */ | |
1131 | static inline void skb_queue_splice_init(struct sk_buff_head *list, | |
1132 | struct sk_buff_head *head) | |
1133 | { | |
1134 | if (!skb_queue_empty(list)) { | |
1135 | __skb_queue_splice(list, (struct sk_buff *) head, head->next); | |
1d4a31dd | 1136 | head->qlen += list->qlen; |
67fed459 DM |
1137 | __skb_queue_head_init(list); |
1138 | } | |
1139 | } | |
1140 | ||
1141 | /** | |
1142 | * skb_queue_splice_tail - join two skb lists, each list being a queue | |
1143 | * @list: the new list to add | |
1144 | * @head: the place to add it in the first list | |
1145 | */ | |
1146 | static inline void skb_queue_splice_tail(const struct sk_buff_head *list, | |
1147 | struct sk_buff_head *head) | |
1148 | { | |
1149 | if (!skb_queue_empty(list)) { | |
1150 | __skb_queue_splice(list, head->prev, (struct sk_buff *) head); | |
1d4a31dd | 1151 | head->qlen += list->qlen; |
67fed459 DM |
1152 | } |
1153 | } | |
1154 | ||
1155 | /** | |
d9619496 | 1156 | * skb_queue_splice_tail_init - join two skb lists and reinitialise the emptied list |
67fed459 DM |
1157 | * @list: the new list to add |
1158 | * @head: the place to add it in the first list | |
1159 | * | |
1160 | * Each of the lists is a queue. | |
1161 | * The list at @list is reinitialised | |
1162 | */ | |
1163 | static inline void skb_queue_splice_tail_init(struct sk_buff_head *list, | |
1164 | struct sk_buff_head *head) | |
1165 | { | |
1166 | if (!skb_queue_empty(list)) { | |
1167 | __skb_queue_splice(list, head->prev, (struct sk_buff *) head); | |
1d4a31dd | 1168 | head->qlen += list->qlen; |
67fed459 DM |
1169 | __skb_queue_head_init(list); |
1170 | } | |
1171 | } | |
1172 | ||
1da177e4 | 1173 | /** |
300ce174 | 1174 | * __skb_queue_after - queue a buffer at the list head |
1da177e4 | 1175 | * @list: list to use |
300ce174 | 1176 | * @prev: place after this buffer |
1da177e4 LT |
1177 | * @newsk: buffer to queue |
1178 | * | |
300ce174 | 1179 | * Queue a buffer int the middle of a list. This function takes no locks |
1da177e4 LT |
1180 | * and you must therefore hold required locks before calling it. |
1181 | * | |
1182 | * A buffer cannot be placed on two lists at the same time. | |
1183 | */ | |
300ce174 SH |
1184 | static inline void __skb_queue_after(struct sk_buff_head *list, |
1185 | struct sk_buff *prev, | |
1186 | struct sk_buff *newsk) | |
1da177e4 | 1187 | { |
bf299275 | 1188 | __skb_insert(newsk, prev, prev->next, list); |
1da177e4 LT |
1189 | } |
1190 | ||
7965bd4d JP |
1191 | void skb_append(struct sk_buff *old, struct sk_buff *newsk, |
1192 | struct sk_buff_head *list); | |
7de6c033 | 1193 | |
f5572855 GR |
1194 | static inline void __skb_queue_before(struct sk_buff_head *list, |
1195 | struct sk_buff *next, | |
1196 | struct sk_buff *newsk) | |
1197 | { | |
1198 | __skb_insert(newsk, next->prev, next, list); | |
1199 | } | |
1200 | ||
300ce174 SH |
1201 | /** |
1202 | * __skb_queue_head - queue a buffer at the list head | |
1203 | * @list: list to use | |
1204 | * @newsk: buffer to queue | |
1205 | * | |
1206 | * Queue a buffer at the start of a list. This function takes no locks | |
1207 | * and you must therefore hold required locks before calling it. | |
1208 | * | |
1209 | * A buffer cannot be placed on two lists at the same time. | |
1210 | */ | |
7965bd4d | 1211 | void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk); |
300ce174 SH |
1212 | static inline void __skb_queue_head(struct sk_buff_head *list, |
1213 | struct sk_buff *newsk) | |
1214 | { | |
1215 | __skb_queue_after(list, (struct sk_buff *)list, newsk); | |
1216 | } | |
1217 | ||
1da177e4 LT |
1218 | /** |
1219 | * __skb_queue_tail - queue a buffer at the list tail | |
1220 | * @list: list to use | |
1221 | * @newsk: buffer to queue | |
1222 | * | |
1223 | * Queue a buffer at the end of a list. This function takes no locks | |
1224 | * and you must therefore hold required locks before calling it. | |
1225 | * | |
1226 | * A buffer cannot be placed on two lists at the same time. | |
1227 | */ | |
7965bd4d | 1228 | void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk); |
1da177e4 LT |
1229 | static inline void __skb_queue_tail(struct sk_buff_head *list, |
1230 | struct sk_buff *newsk) | |
1231 | { | |
f5572855 | 1232 | __skb_queue_before(list, (struct sk_buff *)list, newsk); |
1da177e4 LT |
1233 | } |
1234 | ||
1da177e4 LT |
1235 | /* |
1236 | * remove sk_buff from list. _Must_ be called atomically, and with | |
1237 | * the list known.. | |
1238 | */ | |
7965bd4d | 1239 | void skb_unlink(struct sk_buff *skb, struct sk_buff_head *list); |
1da177e4 LT |
1240 | static inline void __skb_unlink(struct sk_buff *skb, struct sk_buff_head *list) |
1241 | { | |
1242 | struct sk_buff *next, *prev; | |
1243 | ||
1244 | list->qlen--; | |
1245 | next = skb->next; | |
1246 | prev = skb->prev; | |
1247 | skb->next = skb->prev = NULL; | |
1da177e4 LT |
1248 | next->prev = prev; |
1249 | prev->next = next; | |
1250 | } | |
1251 | ||
f525c06d GR |
1252 | /** |
1253 | * __skb_dequeue - remove from the head of the queue | |
1254 | * @list: list to dequeue from | |
1255 | * | |
1256 | * Remove the head of the list. This function does not take any locks | |
1257 | * so must be used with appropriate locks held only. The head item is | |
1258 | * returned or %NULL if the list is empty. | |
1259 | */ | |
7965bd4d | 1260 | struct sk_buff *skb_dequeue(struct sk_buff_head *list); |
f525c06d GR |
1261 | static inline struct sk_buff *__skb_dequeue(struct sk_buff_head *list) |
1262 | { | |
1263 | struct sk_buff *skb = skb_peek(list); | |
1264 | if (skb) | |
1265 | __skb_unlink(skb, list); | |
1266 | return skb; | |
1267 | } | |
1da177e4 LT |
1268 | |
1269 | /** | |
1270 | * __skb_dequeue_tail - remove from the tail of the queue | |
1271 | * @list: list to dequeue from | |
1272 | * | |
1273 | * Remove the tail of the list. This function does not take any locks | |
1274 | * so must be used with appropriate locks held only. The tail item is | |
1275 | * returned or %NULL if the list is empty. | |
1276 | */ | |
7965bd4d | 1277 | struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list); |
1da177e4 LT |
1278 | static inline struct sk_buff *__skb_dequeue_tail(struct sk_buff_head *list) |
1279 | { | |
1280 | struct sk_buff *skb = skb_peek_tail(list); | |
1281 | if (skb) | |
1282 | __skb_unlink(skb, list); | |
1283 | return skb; | |
1284 | } | |
1285 | ||
1286 | ||
bdcc0924 | 1287 | static inline bool skb_is_nonlinear(const struct sk_buff *skb) |
1da177e4 LT |
1288 | { |
1289 | return skb->data_len; | |
1290 | } | |
1291 | ||
1292 | static inline unsigned int skb_headlen(const struct sk_buff *skb) | |
1293 | { | |
1294 | return skb->len - skb->data_len; | |
1295 | } | |
1296 | ||
1297 | static inline int skb_pagelen(const struct sk_buff *skb) | |
1298 | { | |
1299 | int i, len = 0; | |
1300 | ||
1301 | for (i = (int)skb_shinfo(skb)->nr_frags - 1; i >= 0; i--) | |
9e903e08 | 1302 | len += skb_frag_size(&skb_shinfo(skb)->frags[i]); |
1da177e4 LT |
1303 | return len + skb_headlen(skb); |
1304 | } | |
1305 | ||
131ea667 IC |
1306 | /** |
1307 | * __skb_fill_page_desc - initialise a paged fragment in an skb | |
1308 | * @skb: buffer containing fragment to be initialised | |
1309 | * @i: paged fragment index to initialise | |
1310 | * @page: the page to use for this fragment | |
1311 | * @off: the offset to the data with @page | |
1312 | * @size: the length of the data | |
1313 | * | |
1314 | * Initialises the @i'th fragment of @skb to point to &size bytes at | |
1315 | * offset @off within @page. | |
1316 | * | |
1317 | * Does not take any additional reference on the fragment. | |
1318 | */ | |
1319 | static inline void __skb_fill_page_desc(struct sk_buff *skb, int i, | |
1320 | struct page *page, int off, int size) | |
1da177e4 LT |
1321 | { |
1322 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
1323 | ||
c48a11c7 MG |
1324 | /* |
1325 | * Propagate page->pfmemalloc to the skb if we can. The problem is | |
1326 | * that not all callers have unique ownership of the page. If | |
1327 | * pfmemalloc is set, we check the mapping as a mapping implies | |
1328 | * page->index is set (index and pfmemalloc share space). | |
1329 | * If it's a valid mapping, we cannot use page->pfmemalloc but we | |
1330 | * do not lose pfmemalloc information as the pages would not be | |
1331 | * allocated using __GFP_MEMALLOC. | |
1332 | */ | |
a8605c60 | 1333 | frag->page.p = page; |
1da177e4 | 1334 | frag->page_offset = off; |
9e903e08 | 1335 | skb_frag_size_set(frag, size); |
cca7af38 PE |
1336 | |
1337 | page = compound_head(page); | |
1338 | if (page->pfmemalloc && !page->mapping) | |
1339 | skb->pfmemalloc = true; | |
131ea667 IC |
1340 | } |
1341 | ||
1342 | /** | |
1343 | * skb_fill_page_desc - initialise a paged fragment in an skb | |
1344 | * @skb: buffer containing fragment to be initialised | |
1345 | * @i: paged fragment index to initialise | |
1346 | * @page: the page to use for this fragment | |
1347 | * @off: the offset to the data with @page | |
1348 | * @size: the length of the data | |
1349 | * | |
1350 | * As per __skb_fill_page_desc() -- initialises the @i'th fragment of | |
bc32383c | 1351 | * @skb to point to @size bytes at offset @off within @page. In |
131ea667 IC |
1352 | * addition updates @skb such that @i is the last fragment. |
1353 | * | |
1354 | * Does not take any additional reference on the fragment. | |
1355 | */ | |
1356 | static inline void skb_fill_page_desc(struct sk_buff *skb, int i, | |
1357 | struct page *page, int off, int size) | |
1358 | { | |
1359 | __skb_fill_page_desc(skb, i, page, off, size); | |
1da177e4 LT |
1360 | skb_shinfo(skb)->nr_frags = i + 1; |
1361 | } | |
1362 | ||
7965bd4d JP |
1363 | void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off, |
1364 | int size, unsigned int truesize); | |
654bed16 | 1365 | |
f8e617e1 JW |
1366 | void skb_coalesce_rx_frag(struct sk_buff *skb, int i, int size, |
1367 | unsigned int truesize); | |
1368 | ||
1da177e4 | 1369 | #define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags) |
21dc3301 | 1370 | #define SKB_FRAG_ASSERT(skb) BUG_ON(skb_has_frag_list(skb)) |
1da177e4 LT |
1371 | #define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb)) |
1372 | ||
27a884dc ACM |
1373 | #ifdef NET_SKBUFF_DATA_USES_OFFSET |
1374 | static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb) | |
1375 | { | |
1376 | return skb->head + skb->tail; | |
1377 | } | |
1378 | ||
1379 | static inline void skb_reset_tail_pointer(struct sk_buff *skb) | |
1380 | { | |
1381 | skb->tail = skb->data - skb->head; | |
1382 | } | |
1383 | ||
1384 | static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset) | |
1385 | { | |
1386 | skb_reset_tail_pointer(skb); | |
1387 | skb->tail += offset; | |
1388 | } | |
7cc46190 | 1389 | |
27a884dc ACM |
1390 | #else /* NET_SKBUFF_DATA_USES_OFFSET */ |
1391 | static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb) | |
1392 | { | |
1393 | return skb->tail; | |
1394 | } | |
1395 | ||
1396 | static inline void skb_reset_tail_pointer(struct sk_buff *skb) | |
1397 | { | |
1398 | skb->tail = skb->data; | |
1399 | } | |
1400 | ||
1401 | static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset) | |
1402 | { | |
1403 | skb->tail = skb->data + offset; | |
1404 | } | |
4305b541 | 1405 | |
27a884dc ACM |
1406 | #endif /* NET_SKBUFF_DATA_USES_OFFSET */ |
1407 | ||
1da177e4 LT |
1408 | /* |
1409 | * Add data to an sk_buff | |
1410 | */ | |
0c7ddf36 | 1411 | unsigned char *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len); |
7965bd4d | 1412 | unsigned char *skb_put(struct sk_buff *skb, unsigned int len); |
1da177e4 LT |
1413 | static inline unsigned char *__skb_put(struct sk_buff *skb, unsigned int len) |
1414 | { | |
27a884dc | 1415 | unsigned char *tmp = skb_tail_pointer(skb); |
1da177e4 LT |
1416 | SKB_LINEAR_ASSERT(skb); |
1417 | skb->tail += len; | |
1418 | skb->len += len; | |
1419 | return tmp; | |
1420 | } | |
1421 | ||
7965bd4d | 1422 | unsigned char *skb_push(struct sk_buff *skb, unsigned int len); |
1da177e4 LT |
1423 | static inline unsigned char *__skb_push(struct sk_buff *skb, unsigned int len) |
1424 | { | |
1425 | skb->data -= len; | |
1426 | skb->len += len; | |
1427 | return skb->data; | |
1428 | } | |
1429 | ||
7965bd4d | 1430 | unsigned char *skb_pull(struct sk_buff *skb, unsigned int len); |
1da177e4 LT |
1431 | static inline unsigned char *__skb_pull(struct sk_buff *skb, unsigned int len) |
1432 | { | |
1433 | skb->len -= len; | |
1434 | BUG_ON(skb->len < skb->data_len); | |
1435 | return skb->data += len; | |
1436 | } | |
1437 | ||
47d29646 DM |
1438 | static inline unsigned char *skb_pull_inline(struct sk_buff *skb, unsigned int len) |
1439 | { | |
1440 | return unlikely(len > skb->len) ? NULL : __skb_pull(skb, len); | |
1441 | } | |
1442 | ||
7965bd4d | 1443 | unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta); |
1da177e4 LT |
1444 | |
1445 | static inline unsigned char *__pskb_pull(struct sk_buff *skb, unsigned int len) | |
1446 | { | |
1447 | if (len > skb_headlen(skb) && | |
987c402a | 1448 | !__pskb_pull_tail(skb, len - skb_headlen(skb))) |
1da177e4 LT |
1449 | return NULL; |
1450 | skb->len -= len; | |
1451 | return skb->data += len; | |
1452 | } | |
1453 | ||
1454 | static inline unsigned char *pskb_pull(struct sk_buff *skb, unsigned int len) | |
1455 | { | |
1456 | return unlikely(len > skb->len) ? NULL : __pskb_pull(skb, len); | |
1457 | } | |
1458 | ||
1459 | static inline int pskb_may_pull(struct sk_buff *skb, unsigned int len) | |
1460 | { | |
1461 | if (likely(len <= skb_headlen(skb))) | |
1462 | return 1; | |
1463 | if (unlikely(len > skb->len)) | |
1464 | return 0; | |
987c402a | 1465 | return __pskb_pull_tail(skb, len - skb_headlen(skb)) != NULL; |
1da177e4 LT |
1466 | } |
1467 | ||
1468 | /** | |
1469 | * skb_headroom - bytes at buffer head | |
1470 | * @skb: buffer to check | |
1471 | * | |
1472 | * Return the number of bytes of free space at the head of an &sk_buff. | |
1473 | */ | |
c2636b4d | 1474 | static inline unsigned int skb_headroom(const struct sk_buff *skb) |
1da177e4 LT |
1475 | { |
1476 | return skb->data - skb->head; | |
1477 | } | |
1478 | ||
1479 | /** | |
1480 | * skb_tailroom - bytes at buffer end | |
1481 | * @skb: buffer to check | |
1482 | * | |
1483 | * Return the number of bytes of free space at the tail of an sk_buff | |
1484 | */ | |
1485 | static inline int skb_tailroom(const struct sk_buff *skb) | |
1486 | { | |
4305b541 | 1487 | return skb_is_nonlinear(skb) ? 0 : skb->end - skb->tail; |
1da177e4 LT |
1488 | } |
1489 | ||
a21d4572 ED |
1490 | /** |
1491 | * skb_availroom - bytes at buffer end | |
1492 | * @skb: buffer to check | |
1493 | * | |
1494 | * Return the number of bytes of free space at the tail of an sk_buff | |
1495 | * allocated by sk_stream_alloc() | |
1496 | */ | |
1497 | static inline int skb_availroom(const struct sk_buff *skb) | |
1498 | { | |
16fad69c ED |
1499 | if (skb_is_nonlinear(skb)) |
1500 | return 0; | |
1501 | ||
1502 | return skb->end - skb->tail - skb->reserved_tailroom; | |
a21d4572 ED |
1503 | } |
1504 | ||
1da177e4 LT |
1505 | /** |
1506 | * skb_reserve - adjust headroom | |
1507 | * @skb: buffer to alter | |
1508 | * @len: bytes to move | |
1509 | * | |
1510 | * Increase the headroom of an empty &sk_buff by reducing the tail | |
1511 | * room. This is only allowed for an empty buffer. | |
1512 | */ | |
8243126c | 1513 | static inline void skb_reserve(struct sk_buff *skb, int len) |
1da177e4 LT |
1514 | { |
1515 | skb->data += len; | |
1516 | skb->tail += len; | |
1517 | } | |
1518 | ||
6a674e9c JG |
1519 | static inline void skb_reset_inner_headers(struct sk_buff *skb) |
1520 | { | |
aefbd2b3 | 1521 | skb->inner_mac_header = skb->mac_header; |
6a674e9c JG |
1522 | skb->inner_network_header = skb->network_header; |
1523 | skb->inner_transport_header = skb->transport_header; | |
1524 | } | |
1525 | ||
0b5c9db1 JP |
1526 | static inline void skb_reset_mac_len(struct sk_buff *skb) |
1527 | { | |
1528 | skb->mac_len = skb->network_header - skb->mac_header; | |
1529 | } | |
1530 | ||
6a674e9c JG |
1531 | static inline unsigned char *skb_inner_transport_header(const struct sk_buff |
1532 | *skb) | |
1533 | { | |
1534 | return skb->head + skb->inner_transport_header; | |
1535 | } | |
1536 | ||
1537 | static inline void skb_reset_inner_transport_header(struct sk_buff *skb) | |
1538 | { | |
1539 | skb->inner_transport_header = skb->data - skb->head; | |
1540 | } | |
1541 | ||
1542 | static inline void skb_set_inner_transport_header(struct sk_buff *skb, | |
1543 | const int offset) | |
1544 | { | |
1545 | skb_reset_inner_transport_header(skb); | |
1546 | skb->inner_transport_header += offset; | |
1547 | } | |
1548 | ||
1549 | static inline unsigned char *skb_inner_network_header(const struct sk_buff *skb) | |
1550 | { | |
1551 | return skb->head + skb->inner_network_header; | |
1552 | } | |
1553 | ||
1554 | static inline void skb_reset_inner_network_header(struct sk_buff *skb) | |
1555 | { | |
1556 | skb->inner_network_header = skb->data - skb->head; | |
1557 | } | |
1558 | ||
1559 | static inline void skb_set_inner_network_header(struct sk_buff *skb, | |
1560 | const int offset) | |
1561 | { | |
1562 | skb_reset_inner_network_header(skb); | |
1563 | skb->inner_network_header += offset; | |
1564 | } | |
1565 | ||
aefbd2b3 PS |
1566 | static inline unsigned char *skb_inner_mac_header(const struct sk_buff *skb) |
1567 | { | |
1568 | return skb->head + skb->inner_mac_header; | |
1569 | } | |
1570 | ||
1571 | static inline void skb_reset_inner_mac_header(struct sk_buff *skb) | |
1572 | { | |
1573 | skb->inner_mac_header = skb->data - skb->head; | |
1574 | } | |
1575 | ||
1576 | static inline void skb_set_inner_mac_header(struct sk_buff *skb, | |
1577 | const int offset) | |
1578 | { | |
1579 | skb_reset_inner_mac_header(skb); | |
1580 | skb->inner_mac_header += offset; | |
1581 | } | |
fda55eca ED |
1582 | static inline bool skb_transport_header_was_set(const struct sk_buff *skb) |
1583 | { | |
35d04610 | 1584 | return skb->transport_header != (typeof(skb->transport_header))~0U; |
fda55eca ED |
1585 | } |
1586 | ||
9c70220b ACM |
1587 | static inline unsigned char *skb_transport_header(const struct sk_buff *skb) |
1588 | { | |
2e07fa9c | 1589 | return skb->head + skb->transport_header; |
9c70220b ACM |
1590 | } |
1591 | ||
badff6d0 ACM |
1592 | static inline void skb_reset_transport_header(struct sk_buff *skb) |
1593 | { | |
2e07fa9c | 1594 | skb->transport_header = skb->data - skb->head; |
badff6d0 ACM |
1595 | } |
1596 | ||
967b05f6 ACM |
1597 | static inline void skb_set_transport_header(struct sk_buff *skb, |
1598 | const int offset) | |
1599 | { | |
2e07fa9c ACM |
1600 | skb_reset_transport_header(skb); |
1601 | skb->transport_header += offset; | |
ea2ae17d ACM |
1602 | } |
1603 | ||
d56f90a7 ACM |
1604 | static inline unsigned char *skb_network_header(const struct sk_buff *skb) |
1605 | { | |
2e07fa9c | 1606 | return skb->head + skb->network_header; |
d56f90a7 ACM |
1607 | } |
1608 | ||
c1d2bbe1 ACM |
1609 | static inline void skb_reset_network_header(struct sk_buff *skb) |
1610 | { | |
2e07fa9c | 1611 | skb->network_header = skb->data - skb->head; |
c1d2bbe1 ACM |
1612 | } |
1613 | ||
c14d2450 ACM |
1614 | static inline void skb_set_network_header(struct sk_buff *skb, const int offset) |
1615 | { | |
2e07fa9c ACM |
1616 | skb_reset_network_header(skb); |
1617 | skb->network_header += offset; | |
c14d2450 ACM |
1618 | } |
1619 | ||
2e07fa9c | 1620 | static inline unsigned char *skb_mac_header(const struct sk_buff *skb) |
bbe735e4 | 1621 | { |
2e07fa9c | 1622 | return skb->head + skb->mac_header; |
bbe735e4 ACM |
1623 | } |
1624 | ||
2e07fa9c | 1625 | static inline int skb_mac_header_was_set(const struct sk_buff *skb) |
cfe1fc77 | 1626 | { |
35d04610 | 1627 | return skb->mac_header != (typeof(skb->mac_header))~0U; |
2e07fa9c ACM |
1628 | } |
1629 | ||
1630 | static inline void skb_reset_mac_header(struct sk_buff *skb) | |
1631 | { | |
1632 | skb->mac_header = skb->data - skb->head; | |
1633 | } | |
1634 | ||
1635 | static inline void skb_set_mac_header(struct sk_buff *skb, const int offset) | |
1636 | { | |
1637 | skb_reset_mac_header(skb); | |
1638 | skb->mac_header += offset; | |
1639 | } | |
1640 | ||
fbbdb8f0 YX |
1641 | static inline void skb_probe_transport_header(struct sk_buff *skb, |
1642 | const int offset_hint) | |
1643 | { | |
1644 | struct flow_keys keys; | |
1645 | ||
1646 | if (skb_transport_header_was_set(skb)) | |
1647 | return; | |
1648 | else if (skb_flow_dissect(skb, &keys)) | |
1649 | skb_set_transport_header(skb, keys.thoff); | |
1650 | else | |
1651 | skb_set_transport_header(skb, offset_hint); | |
1652 | } | |
1653 | ||
03606895 ED |
1654 | static inline void skb_mac_header_rebuild(struct sk_buff *skb) |
1655 | { | |
1656 | if (skb_mac_header_was_set(skb)) { | |
1657 | const unsigned char *old_mac = skb_mac_header(skb); | |
1658 | ||
1659 | skb_set_mac_header(skb, -skb->mac_len); | |
1660 | memmove(skb_mac_header(skb), old_mac, skb->mac_len); | |
1661 | } | |
1662 | } | |
1663 | ||
04fb451e MM |
1664 | static inline int skb_checksum_start_offset(const struct sk_buff *skb) |
1665 | { | |
1666 | return skb->csum_start - skb_headroom(skb); | |
1667 | } | |
1668 | ||
2e07fa9c ACM |
1669 | static inline int skb_transport_offset(const struct sk_buff *skb) |
1670 | { | |
1671 | return skb_transport_header(skb) - skb->data; | |
1672 | } | |
1673 | ||
1674 | static inline u32 skb_network_header_len(const struct sk_buff *skb) | |
1675 | { | |
1676 | return skb->transport_header - skb->network_header; | |
1677 | } | |
1678 | ||
6a674e9c JG |
1679 | static inline u32 skb_inner_network_header_len(const struct sk_buff *skb) |
1680 | { | |
1681 | return skb->inner_transport_header - skb->inner_network_header; | |
1682 | } | |
1683 | ||
2e07fa9c ACM |
1684 | static inline int skb_network_offset(const struct sk_buff *skb) |
1685 | { | |
1686 | return skb_network_header(skb) - skb->data; | |
1687 | } | |
48d49d0c | 1688 | |
6a674e9c JG |
1689 | static inline int skb_inner_network_offset(const struct sk_buff *skb) |
1690 | { | |
1691 | return skb_inner_network_header(skb) - skb->data; | |
1692 | } | |
1693 | ||
f9599ce1 CG |
1694 | static inline int pskb_network_may_pull(struct sk_buff *skb, unsigned int len) |
1695 | { | |
1696 | return pskb_may_pull(skb, skb_network_offset(skb) + len); | |
1697 | } | |
1698 | ||
1da177e4 LT |
1699 | /* |
1700 | * CPUs often take a performance hit when accessing unaligned memory | |
1701 | * locations. The actual performance hit varies, it can be small if the | |
1702 | * hardware handles it or large if we have to take an exception and fix it | |
1703 | * in software. | |
1704 | * | |
1705 | * Since an ethernet header is 14 bytes network drivers often end up with | |
1706 | * the IP header at an unaligned offset. The IP header can be aligned by | |
1707 | * shifting the start of the packet by 2 bytes. Drivers should do this | |
1708 | * with: | |
1709 | * | |
8660c124 | 1710 | * skb_reserve(skb, NET_IP_ALIGN); |
1da177e4 LT |
1711 | * |
1712 | * The downside to this alignment of the IP header is that the DMA is now | |
1713 | * unaligned. On some architectures the cost of an unaligned DMA is high | |
1714 | * and this cost outweighs the gains made by aligning the IP header. | |
8660c124 | 1715 | * |
1da177e4 LT |
1716 | * Since this trade off varies between architectures, we allow NET_IP_ALIGN |
1717 | * to be overridden. | |
1718 | */ | |
1719 | #ifndef NET_IP_ALIGN | |
1720 | #define NET_IP_ALIGN 2 | |
1721 | #endif | |
1722 | ||
025be81e AB |
1723 | /* |
1724 | * The networking layer reserves some headroom in skb data (via | |
1725 | * dev_alloc_skb). This is used to avoid having to reallocate skb data when | |
1726 | * the header has to grow. In the default case, if the header has to grow | |
d6301d3d | 1727 | * 32 bytes or less we avoid the reallocation. |
025be81e AB |
1728 | * |
1729 | * Unfortunately this headroom changes the DMA alignment of the resulting | |
1730 | * network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive | |
1731 | * on some architectures. An architecture can override this value, | |
1732 | * perhaps setting it to a cacheline in size (since that will maintain | |
1733 | * cacheline alignment of the DMA). It must be a power of 2. | |
1734 | * | |
d6301d3d | 1735 | * Various parts of the networking layer expect at least 32 bytes of |
025be81e | 1736 | * headroom, you should not reduce this. |
5933dd2f ED |
1737 | * |
1738 | * Using max(32, L1_CACHE_BYTES) makes sense (especially with RPS) | |
1739 | * to reduce average number of cache lines per packet. | |
1740 | * get_rps_cpus() for example only access one 64 bytes aligned block : | |
18e8c134 | 1741 | * NET_IP_ALIGN(2) + ethernet_header(14) + IP_header(20/40) + ports(8) |
025be81e AB |
1742 | */ |
1743 | #ifndef NET_SKB_PAD | |
5933dd2f | 1744 | #define NET_SKB_PAD max(32, L1_CACHE_BYTES) |
025be81e AB |
1745 | #endif |
1746 | ||
7965bd4d | 1747 | int ___pskb_trim(struct sk_buff *skb, unsigned int len); |
1da177e4 LT |
1748 | |
1749 | static inline void __skb_trim(struct sk_buff *skb, unsigned int len) | |
1750 | { | |
c4264f27 | 1751 | if (unlikely(skb_is_nonlinear(skb))) { |
3cc0e873 HX |
1752 | WARN_ON(1); |
1753 | return; | |
1754 | } | |
27a884dc ACM |
1755 | skb->len = len; |
1756 | skb_set_tail_pointer(skb, len); | |
1da177e4 LT |
1757 | } |
1758 | ||
7965bd4d | 1759 | void skb_trim(struct sk_buff *skb, unsigned int len); |
1da177e4 LT |
1760 | |
1761 | static inline int __pskb_trim(struct sk_buff *skb, unsigned int len) | |
1762 | { | |
3cc0e873 HX |
1763 | if (skb->data_len) |
1764 | return ___pskb_trim(skb, len); | |
1765 | __skb_trim(skb, len); | |
1766 | return 0; | |
1da177e4 LT |
1767 | } |
1768 | ||
1769 | static inline int pskb_trim(struct sk_buff *skb, unsigned int len) | |
1770 | { | |
1771 | return (len < skb->len) ? __pskb_trim(skb, len) : 0; | |
1772 | } | |
1773 | ||
e9fa4f7b HX |
1774 | /** |
1775 | * pskb_trim_unique - remove end from a paged unique (not cloned) buffer | |
1776 | * @skb: buffer to alter | |
1777 | * @len: new length | |
1778 | * | |
1779 | * This is identical to pskb_trim except that the caller knows that | |
1780 | * the skb is not cloned so we should never get an error due to out- | |
1781 | * of-memory. | |
1782 | */ | |
1783 | static inline void pskb_trim_unique(struct sk_buff *skb, unsigned int len) | |
1784 | { | |
1785 | int err = pskb_trim(skb, len); | |
1786 | BUG_ON(err); | |
1787 | } | |
1788 | ||
1da177e4 LT |
1789 | /** |
1790 | * skb_orphan - orphan a buffer | |
1791 | * @skb: buffer to orphan | |
1792 | * | |
1793 | * If a buffer currently has an owner then we call the owner's | |
1794 | * destructor function and make the @skb unowned. The buffer continues | |
1795 | * to exist but is no longer charged to its former owner. | |
1796 | */ | |
1797 | static inline void skb_orphan(struct sk_buff *skb) | |
1798 | { | |
c34a7612 | 1799 | if (skb->destructor) { |
1da177e4 | 1800 | skb->destructor(skb); |
c34a7612 ED |
1801 | skb->destructor = NULL; |
1802 | skb->sk = NULL; | |
376c7311 ED |
1803 | } else { |
1804 | BUG_ON(skb->sk); | |
c34a7612 | 1805 | } |
1da177e4 LT |
1806 | } |
1807 | ||
a353e0ce MT |
1808 | /** |
1809 | * skb_orphan_frags - orphan the frags contained in a buffer | |
1810 | * @skb: buffer to orphan frags from | |
1811 | * @gfp_mask: allocation mask for replacement pages | |
1812 | * | |
1813 | * For each frag in the SKB which needs a destructor (i.e. has an | |
1814 | * owner) create a copy of that frag and release the original | |
1815 | * page by calling the destructor. | |
1816 | */ | |
1817 | static inline int skb_orphan_frags(struct sk_buff *skb, gfp_t gfp_mask) | |
1818 | { | |
1819 | if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY))) | |
1820 | return 0; | |
1821 | return skb_copy_ubufs(skb, gfp_mask); | |
1822 | } | |
1823 | ||
1da177e4 LT |
1824 | /** |
1825 | * __skb_queue_purge - empty a list | |
1826 | * @list: list to empty | |
1827 | * | |
1828 | * Delete all buffers on an &sk_buff list. Each buffer is removed from | |
1829 | * the list and one reference dropped. This function does not take the | |
1830 | * list lock and the caller must hold the relevant locks to use it. | |
1831 | */ | |
7965bd4d | 1832 | void skb_queue_purge(struct sk_buff_head *list); |
1da177e4 LT |
1833 | static inline void __skb_queue_purge(struct sk_buff_head *list) |
1834 | { | |
1835 | struct sk_buff *skb; | |
1836 | while ((skb = __skb_dequeue(list)) != NULL) | |
1837 | kfree_skb(skb); | |
1838 | } | |
1839 | ||
e5e67305 AD |
1840 | #define NETDEV_FRAG_PAGE_MAX_ORDER get_order(32768) |
1841 | #define NETDEV_FRAG_PAGE_MAX_SIZE (PAGE_SIZE << NETDEV_FRAG_PAGE_MAX_ORDER) | |
1842 | #define NETDEV_PAGECNT_MAX_BIAS NETDEV_FRAG_PAGE_MAX_SIZE | |
1843 | ||
7965bd4d | 1844 | void *netdev_alloc_frag(unsigned int fragsz); |
1da177e4 | 1845 | |
7965bd4d JP |
1846 | struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int length, |
1847 | gfp_t gfp_mask); | |
8af27456 CH |
1848 | |
1849 | /** | |
1850 | * netdev_alloc_skb - allocate an skbuff for rx on a specific device | |
1851 | * @dev: network device to receive on | |
1852 | * @length: length to allocate | |
1853 | * | |
1854 | * Allocate a new &sk_buff and assign it a usage count of one. The | |
1855 | * buffer has unspecified headroom built in. Users should allocate | |
1856 | * the headroom they think they need without accounting for the | |
1857 | * built in space. The built in space is used for optimisations. | |
1858 | * | |
1859 | * %NULL is returned if there is no free memory. Although this function | |
1860 | * allocates memory it can be called from an interrupt. | |
1861 | */ | |
1862 | static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev, | |
6f532612 | 1863 | unsigned int length) |
8af27456 CH |
1864 | { |
1865 | return __netdev_alloc_skb(dev, length, GFP_ATOMIC); | |
1866 | } | |
1867 | ||
6f532612 ED |
1868 | /* legacy helper around __netdev_alloc_skb() */ |
1869 | static inline struct sk_buff *__dev_alloc_skb(unsigned int length, | |
1870 | gfp_t gfp_mask) | |
1871 | { | |
1872 | return __netdev_alloc_skb(NULL, length, gfp_mask); | |
1873 | } | |
1874 | ||
1875 | /* legacy helper around netdev_alloc_skb() */ | |
1876 | static inline struct sk_buff *dev_alloc_skb(unsigned int length) | |
1877 | { | |
1878 | return netdev_alloc_skb(NULL, length); | |
1879 | } | |
1880 | ||
1881 | ||
4915a0de ED |
1882 | static inline struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev, |
1883 | unsigned int length, gfp_t gfp) | |
61321bbd | 1884 | { |
4915a0de | 1885 | struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp); |
61321bbd ED |
1886 | |
1887 | if (NET_IP_ALIGN && skb) | |
1888 | skb_reserve(skb, NET_IP_ALIGN); | |
1889 | return skb; | |
1890 | } | |
1891 | ||
4915a0de ED |
1892 | static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev, |
1893 | unsigned int length) | |
1894 | { | |
1895 | return __netdev_alloc_skb_ip_align(dev, length, GFP_ATOMIC); | |
1896 | } | |
1897 | ||
bc6fc9fa FF |
1898 | /** |
1899 | * __skb_alloc_pages - allocate pages for ps-rx on a skb and preserve pfmemalloc data | |
0614002b MG |
1900 | * @gfp_mask: alloc_pages_node mask. Set __GFP_NOMEMALLOC if not for network packet RX |
1901 | * @skb: skb to set pfmemalloc on if __GFP_MEMALLOC is used | |
1902 | * @order: size of the allocation | |
1903 | * | |
1904 | * Allocate a new page. | |
1905 | * | |
1906 | * %NULL is returned if there is no free memory. | |
1907 | */ | |
1908 | static inline struct page *__skb_alloc_pages(gfp_t gfp_mask, | |
1909 | struct sk_buff *skb, | |
1910 | unsigned int order) | |
1911 | { | |
1912 | struct page *page; | |
1913 | ||
1914 | gfp_mask |= __GFP_COLD; | |
1915 | ||
1916 | if (!(gfp_mask & __GFP_NOMEMALLOC)) | |
1917 | gfp_mask |= __GFP_MEMALLOC; | |
1918 | ||
1919 | page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, order); | |
1920 | if (skb && page && page->pfmemalloc) | |
1921 | skb->pfmemalloc = true; | |
1922 | ||
1923 | return page; | |
1924 | } | |
1925 | ||
1926 | /** | |
1927 | * __skb_alloc_page - allocate a page for ps-rx for a given skb and preserve pfmemalloc data | |
1928 | * @gfp_mask: alloc_pages_node mask. Set __GFP_NOMEMALLOC if not for network packet RX | |
1929 | * @skb: skb to set pfmemalloc on if __GFP_MEMALLOC is used | |
1930 | * | |
1931 | * Allocate a new page. | |
1932 | * | |
1933 | * %NULL is returned if there is no free memory. | |
1934 | */ | |
1935 | static inline struct page *__skb_alloc_page(gfp_t gfp_mask, | |
1936 | struct sk_buff *skb) | |
1937 | { | |
1938 | return __skb_alloc_pages(gfp_mask, skb, 0); | |
1939 | } | |
1940 | ||
1941 | /** | |
1942 | * skb_propagate_pfmemalloc - Propagate pfmemalloc if skb is allocated after RX page | |
1943 | * @page: The page that was allocated from skb_alloc_page | |
1944 | * @skb: The skb that may need pfmemalloc set | |
1945 | */ | |
1946 | static inline void skb_propagate_pfmemalloc(struct page *page, | |
1947 | struct sk_buff *skb) | |
1948 | { | |
1949 | if (page && page->pfmemalloc) | |
1950 | skb->pfmemalloc = true; | |
1951 | } | |
1952 | ||
131ea667 IC |
1953 | /** |
1954 | * skb_frag_page - retrieve the page refered to by a paged fragment | |
1955 | * @frag: the paged fragment | |
1956 | * | |
1957 | * Returns the &struct page associated with @frag. | |
1958 | */ | |
1959 | static inline struct page *skb_frag_page(const skb_frag_t *frag) | |
1960 | { | |
a8605c60 | 1961 | return frag->page.p; |
131ea667 IC |
1962 | } |
1963 | ||
1964 | /** | |
1965 | * __skb_frag_ref - take an addition reference on a paged fragment. | |
1966 | * @frag: the paged fragment | |
1967 | * | |
1968 | * Takes an additional reference on the paged fragment @frag. | |
1969 | */ | |
1970 | static inline void __skb_frag_ref(skb_frag_t *frag) | |
1971 | { | |
1972 | get_page(skb_frag_page(frag)); | |
1973 | } | |
1974 | ||
1975 | /** | |
1976 | * skb_frag_ref - take an addition reference on a paged fragment of an skb. | |
1977 | * @skb: the buffer | |
1978 | * @f: the fragment offset. | |
1979 | * | |
1980 | * Takes an additional reference on the @f'th paged fragment of @skb. | |
1981 | */ | |
1982 | static inline void skb_frag_ref(struct sk_buff *skb, int f) | |
1983 | { | |
1984 | __skb_frag_ref(&skb_shinfo(skb)->frags[f]); | |
1985 | } | |
1986 | ||
1987 | /** | |
1988 | * __skb_frag_unref - release a reference on a paged fragment. | |
1989 | * @frag: the paged fragment | |
1990 | * | |
1991 | * Releases a reference on the paged fragment @frag. | |
1992 | */ | |
1993 | static inline void __skb_frag_unref(skb_frag_t *frag) | |
1994 | { | |
1995 | put_page(skb_frag_page(frag)); | |
1996 | } | |
1997 | ||
1998 | /** | |
1999 | * skb_frag_unref - release a reference on a paged fragment of an skb. | |
2000 | * @skb: the buffer | |
2001 | * @f: the fragment offset | |
2002 | * | |
2003 | * Releases a reference on the @f'th paged fragment of @skb. | |
2004 | */ | |
2005 | static inline void skb_frag_unref(struct sk_buff *skb, int f) | |
2006 | { | |
2007 | __skb_frag_unref(&skb_shinfo(skb)->frags[f]); | |
2008 | } | |
2009 | ||
2010 | /** | |
2011 | * skb_frag_address - gets the address of the data contained in a paged fragment | |
2012 | * @frag: the paged fragment buffer | |
2013 | * | |
2014 | * Returns the address of the data within @frag. The page must already | |
2015 | * be mapped. | |
2016 | */ | |
2017 | static inline void *skb_frag_address(const skb_frag_t *frag) | |
2018 | { | |
2019 | return page_address(skb_frag_page(frag)) + frag->page_offset; | |
2020 | } | |
2021 | ||
2022 | /** | |
2023 | * skb_frag_address_safe - gets the address of the data contained in a paged fragment | |
2024 | * @frag: the paged fragment buffer | |
2025 | * | |
2026 | * Returns the address of the data within @frag. Checks that the page | |
2027 | * is mapped and returns %NULL otherwise. | |
2028 | */ | |
2029 | static inline void *skb_frag_address_safe(const skb_frag_t *frag) | |
2030 | { | |
2031 | void *ptr = page_address(skb_frag_page(frag)); | |
2032 | if (unlikely(!ptr)) | |
2033 | return NULL; | |
2034 | ||
2035 | return ptr + frag->page_offset; | |
2036 | } | |
2037 | ||
2038 | /** | |
2039 | * __skb_frag_set_page - sets the page contained in a paged fragment | |
2040 | * @frag: the paged fragment | |
2041 | * @page: the page to set | |
2042 | * | |
2043 | * Sets the fragment @frag to contain @page. | |
2044 | */ | |
2045 | static inline void __skb_frag_set_page(skb_frag_t *frag, struct page *page) | |
2046 | { | |
a8605c60 | 2047 | frag->page.p = page; |
131ea667 IC |
2048 | } |
2049 | ||
2050 | /** | |
2051 | * skb_frag_set_page - sets the page contained in a paged fragment of an skb | |
2052 | * @skb: the buffer | |
2053 | * @f: the fragment offset | |
2054 | * @page: the page to set | |
2055 | * | |
2056 | * Sets the @f'th fragment of @skb to contain @page. | |
2057 | */ | |
2058 | static inline void skb_frag_set_page(struct sk_buff *skb, int f, | |
2059 | struct page *page) | |
2060 | { | |
2061 | __skb_frag_set_page(&skb_shinfo(skb)->frags[f], page); | |
2062 | } | |
2063 | ||
400dfd3a ED |
2064 | bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio); |
2065 | ||
131ea667 IC |
2066 | /** |
2067 | * skb_frag_dma_map - maps a paged fragment via the DMA API | |
f83347df | 2068 | * @dev: the device to map the fragment to |
131ea667 IC |
2069 | * @frag: the paged fragment to map |
2070 | * @offset: the offset within the fragment (starting at the | |
2071 | * fragment's own offset) | |
2072 | * @size: the number of bytes to map | |
f83347df | 2073 | * @dir: the direction of the mapping (%PCI_DMA_*) |
131ea667 IC |
2074 | * |
2075 | * Maps the page associated with @frag to @device. | |
2076 | */ | |
2077 | static inline dma_addr_t skb_frag_dma_map(struct device *dev, | |
2078 | const skb_frag_t *frag, | |
2079 | size_t offset, size_t size, | |
2080 | enum dma_data_direction dir) | |
2081 | { | |
2082 | return dma_map_page(dev, skb_frag_page(frag), | |
2083 | frag->page_offset + offset, size, dir); | |
2084 | } | |
2085 | ||
117632e6 ED |
2086 | static inline struct sk_buff *pskb_copy(struct sk_buff *skb, |
2087 | gfp_t gfp_mask) | |
2088 | { | |
2089 | return __pskb_copy(skb, skb_headroom(skb), gfp_mask); | |
2090 | } | |
2091 | ||
334a8132 PM |
2092 | /** |
2093 | * skb_clone_writable - is the header of a clone writable | |
2094 | * @skb: buffer to check | |
2095 | * @len: length up to which to write | |
2096 | * | |
2097 | * Returns true if modifying the header part of the cloned buffer | |
2098 | * does not requires the data to be copied. | |
2099 | */ | |
05bdd2f1 | 2100 | static inline int skb_clone_writable(const struct sk_buff *skb, unsigned int len) |
334a8132 PM |
2101 | { |
2102 | return !skb_header_cloned(skb) && | |
2103 | skb_headroom(skb) + len <= skb->hdr_len; | |
2104 | } | |
2105 | ||
d9cc2048 HX |
2106 | static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom, |
2107 | int cloned) | |
2108 | { | |
2109 | int delta = 0; | |
2110 | ||
d9cc2048 HX |
2111 | if (headroom > skb_headroom(skb)) |
2112 | delta = headroom - skb_headroom(skb); | |
2113 | ||
2114 | if (delta || cloned) | |
2115 | return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0, | |
2116 | GFP_ATOMIC); | |
2117 | return 0; | |
2118 | } | |
2119 | ||
1da177e4 LT |
2120 | /** |
2121 | * skb_cow - copy header of skb when it is required | |
2122 | * @skb: buffer to cow | |
2123 | * @headroom: needed headroom | |
2124 | * | |
2125 | * If the skb passed lacks sufficient headroom or its data part | |
2126 | * is shared, data is reallocated. If reallocation fails, an error | |
2127 | * is returned and original skb is not changed. | |
2128 | * | |
2129 | * The result is skb with writable area skb->head...skb->tail | |
2130 | * and at least @headroom of space at head. | |
2131 | */ | |
2132 | static inline int skb_cow(struct sk_buff *skb, unsigned int headroom) | |
2133 | { | |
d9cc2048 HX |
2134 | return __skb_cow(skb, headroom, skb_cloned(skb)); |
2135 | } | |
1da177e4 | 2136 | |
d9cc2048 HX |
2137 | /** |
2138 | * skb_cow_head - skb_cow but only making the head writable | |
2139 | * @skb: buffer to cow | |
2140 | * @headroom: needed headroom | |
2141 | * | |
2142 | * This function is identical to skb_cow except that we replace the | |
2143 | * skb_cloned check by skb_header_cloned. It should be used when | |
2144 | * you only need to push on some header and do not need to modify | |
2145 | * the data. | |
2146 | */ | |
2147 | static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom) | |
2148 | { | |
2149 | return __skb_cow(skb, headroom, skb_header_cloned(skb)); | |
1da177e4 LT |
2150 | } |
2151 | ||
2152 | /** | |
2153 | * skb_padto - pad an skbuff up to a minimal size | |
2154 | * @skb: buffer to pad | |
2155 | * @len: minimal length | |
2156 | * | |
2157 | * Pads up a buffer to ensure the trailing bytes exist and are | |
2158 | * blanked. If the buffer already contains sufficient data it | |
5b057c6b HX |
2159 | * is untouched. Otherwise it is extended. Returns zero on |
2160 | * success. The skb is freed on error. | |
1da177e4 LT |
2161 | */ |
2162 | ||
5b057c6b | 2163 | static inline int skb_padto(struct sk_buff *skb, unsigned int len) |
1da177e4 LT |
2164 | { |
2165 | unsigned int size = skb->len; | |
2166 | if (likely(size >= len)) | |
5b057c6b | 2167 | return 0; |
987c402a | 2168 | return skb_pad(skb, len - size); |
1da177e4 LT |
2169 | } |
2170 | ||
2171 | static inline int skb_add_data(struct sk_buff *skb, | |
2172 | char __user *from, int copy) | |
2173 | { | |
2174 | const int off = skb->len; | |
2175 | ||
2176 | if (skb->ip_summed == CHECKSUM_NONE) { | |
2177 | int err = 0; | |
5084205f | 2178 | __wsum csum = csum_and_copy_from_user(from, skb_put(skb, copy), |
1da177e4 LT |
2179 | copy, 0, &err); |
2180 | if (!err) { | |
2181 | skb->csum = csum_block_add(skb->csum, csum, off); | |
2182 | return 0; | |
2183 | } | |
2184 | } else if (!copy_from_user(skb_put(skb, copy), from, copy)) | |
2185 | return 0; | |
2186 | ||
2187 | __skb_trim(skb, off); | |
2188 | return -EFAULT; | |
2189 | } | |
2190 | ||
38ba0a65 ED |
2191 | static inline bool skb_can_coalesce(struct sk_buff *skb, int i, |
2192 | const struct page *page, int off) | |
1da177e4 LT |
2193 | { |
2194 | if (i) { | |
9e903e08 | 2195 | const struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i - 1]; |
1da177e4 | 2196 | |
ea2ab693 | 2197 | return page == skb_frag_page(frag) && |
9e903e08 | 2198 | off == frag->page_offset + skb_frag_size(frag); |
1da177e4 | 2199 | } |
38ba0a65 | 2200 | return false; |
1da177e4 LT |
2201 | } |
2202 | ||
364c6bad HX |
2203 | static inline int __skb_linearize(struct sk_buff *skb) |
2204 | { | |
2205 | return __pskb_pull_tail(skb, skb->data_len) ? 0 : -ENOMEM; | |
2206 | } | |
2207 | ||
1da177e4 LT |
2208 | /** |
2209 | * skb_linearize - convert paged skb to linear one | |
2210 | * @skb: buffer to linarize | |
1da177e4 LT |
2211 | * |
2212 | * If there is no free memory -ENOMEM is returned, otherwise zero | |
2213 | * is returned and the old skb data released. | |
2214 | */ | |
364c6bad HX |
2215 | static inline int skb_linearize(struct sk_buff *skb) |
2216 | { | |
2217 | return skb_is_nonlinear(skb) ? __skb_linearize(skb) : 0; | |
2218 | } | |
2219 | ||
cef401de ED |
2220 | /** |
2221 | * skb_has_shared_frag - can any frag be overwritten | |
2222 | * @skb: buffer to test | |
2223 | * | |
2224 | * Return true if the skb has at least one frag that might be modified | |
2225 | * by an external entity (as in vmsplice()/sendfile()) | |
2226 | */ | |
2227 | static inline bool skb_has_shared_frag(const struct sk_buff *skb) | |
2228 | { | |
c9af6db4 PS |
2229 | return skb_is_nonlinear(skb) && |
2230 | skb_shinfo(skb)->tx_flags & SKBTX_SHARED_FRAG; | |
cef401de ED |
2231 | } |
2232 | ||
364c6bad HX |
2233 | /** |
2234 | * skb_linearize_cow - make sure skb is linear and writable | |
2235 | * @skb: buffer to process | |
2236 | * | |
2237 | * If there is no free memory -ENOMEM is returned, otherwise zero | |
2238 | * is returned and the old skb data released. | |
2239 | */ | |
2240 | static inline int skb_linearize_cow(struct sk_buff *skb) | |
1da177e4 | 2241 | { |
364c6bad HX |
2242 | return skb_is_nonlinear(skb) || skb_cloned(skb) ? |
2243 | __skb_linearize(skb) : 0; | |
1da177e4 LT |
2244 | } |
2245 | ||
2246 | /** | |
2247 | * skb_postpull_rcsum - update checksum for received skb after pull | |
2248 | * @skb: buffer to update | |
2249 | * @start: start of data before pull | |
2250 | * @len: length of data pulled | |
2251 | * | |
2252 | * After doing a pull on a received packet, you need to call this to | |
84fa7933 PM |
2253 | * update the CHECKSUM_COMPLETE checksum, or set ip_summed to |
2254 | * CHECKSUM_NONE so that it can be recomputed from scratch. | |
1da177e4 LT |
2255 | */ |
2256 | ||
2257 | static inline void skb_postpull_rcsum(struct sk_buff *skb, | |
cbb042f9 | 2258 | const void *start, unsigned int len) |
1da177e4 | 2259 | { |
84fa7933 | 2260 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
1da177e4 LT |
2261 | skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0)); |
2262 | } | |
2263 | ||
cbb042f9 HX |
2264 | unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len); |
2265 | ||
7ce5a27f DM |
2266 | /** |
2267 | * pskb_trim_rcsum - trim received skb and update checksum | |
2268 | * @skb: buffer to trim | |
2269 | * @len: new length | |
2270 | * | |
2271 | * This is exactly the same as pskb_trim except that it ensures the | |
2272 | * checksum of received packets are still valid after the operation. | |
2273 | */ | |
2274 | ||
2275 | static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len) | |
2276 | { | |
2277 | if (likely(len >= skb->len)) | |
2278 | return 0; | |
2279 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
2280 | skb->ip_summed = CHECKSUM_NONE; | |
2281 | return __pskb_trim(skb, len); | |
2282 | } | |
2283 | ||
1da177e4 LT |
2284 | #define skb_queue_walk(queue, skb) \ |
2285 | for (skb = (queue)->next; \ | |
a1e4891f | 2286 | skb != (struct sk_buff *)(queue); \ |
1da177e4 LT |
2287 | skb = skb->next) |
2288 | ||
46f8914e JC |
2289 | #define skb_queue_walk_safe(queue, skb, tmp) \ |
2290 | for (skb = (queue)->next, tmp = skb->next; \ | |
2291 | skb != (struct sk_buff *)(queue); \ | |
2292 | skb = tmp, tmp = skb->next) | |
2293 | ||
1164f52a | 2294 | #define skb_queue_walk_from(queue, skb) \ |
a1e4891f | 2295 | for (; skb != (struct sk_buff *)(queue); \ |
1164f52a DM |
2296 | skb = skb->next) |
2297 | ||
2298 | #define skb_queue_walk_from_safe(queue, skb, tmp) \ | |
2299 | for (tmp = skb->next; \ | |
2300 | skb != (struct sk_buff *)(queue); \ | |
2301 | skb = tmp, tmp = skb->next) | |
2302 | ||
300ce174 SH |
2303 | #define skb_queue_reverse_walk(queue, skb) \ |
2304 | for (skb = (queue)->prev; \ | |
a1e4891f | 2305 | skb != (struct sk_buff *)(queue); \ |
300ce174 SH |
2306 | skb = skb->prev) |
2307 | ||
686a2955 DM |
2308 | #define skb_queue_reverse_walk_safe(queue, skb, tmp) \ |
2309 | for (skb = (queue)->prev, tmp = skb->prev; \ | |
2310 | skb != (struct sk_buff *)(queue); \ | |
2311 | skb = tmp, tmp = skb->prev) | |
2312 | ||
2313 | #define skb_queue_reverse_walk_from_safe(queue, skb, tmp) \ | |
2314 | for (tmp = skb->prev; \ | |
2315 | skb != (struct sk_buff *)(queue); \ | |
2316 | skb = tmp, tmp = skb->prev) | |
1da177e4 | 2317 | |
21dc3301 | 2318 | static inline bool skb_has_frag_list(const struct sk_buff *skb) |
ee039871 DM |
2319 | { |
2320 | return skb_shinfo(skb)->frag_list != NULL; | |
2321 | } | |
2322 | ||
2323 | static inline void skb_frag_list_init(struct sk_buff *skb) | |
2324 | { | |
2325 | skb_shinfo(skb)->frag_list = NULL; | |
2326 | } | |
2327 | ||
2328 | static inline void skb_frag_add_head(struct sk_buff *skb, struct sk_buff *frag) | |
2329 | { | |
2330 | frag->next = skb_shinfo(skb)->frag_list; | |
2331 | skb_shinfo(skb)->frag_list = frag; | |
2332 | } | |
2333 | ||
2334 | #define skb_walk_frags(skb, iter) \ | |
2335 | for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next) | |
2336 | ||
7965bd4d JP |
2337 | struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags, |
2338 | int *peeked, int *off, int *err); | |
2339 | struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags, int noblock, | |
2340 | int *err); | |
2341 | unsigned int datagram_poll(struct file *file, struct socket *sock, | |
2342 | struct poll_table_struct *wait); | |
2343 | int skb_copy_datagram_iovec(const struct sk_buff *from, int offset, | |
2344 | struct iovec *to, int size); | |
2345 | int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb, int hlen, | |
2346 | struct iovec *iov); | |
2347 | int skb_copy_datagram_from_iovec(struct sk_buff *skb, int offset, | |
2348 | const struct iovec *from, int from_offset, | |
2349 | int len); | |
2350 | int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *frm, | |
2351 | int offset, size_t count); | |
2352 | int skb_copy_datagram_const_iovec(const struct sk_buff *from, int offset, | |
2353 | const struct iovec *to, int to_offset, | |
2354 | int size); | |
2355 | void skb_free_datagram(struct sock *sk, struct sk_buff *skb); | |
2356 | void skb_free_datagram_locked(struct sock *sk, struct sk_buff *skb); | |
2357 | int skb_kill_datagram(struct sock *sk, struct sk_buff *skb, unsigned int flags); | |
7965bd4d JP |
2358 | int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len); |
2359 | int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len); | |
2360 | __wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset, u8 *to, | |
2361 | int len, __wsum csum); | |
2362 | int skb_splice_bits(struct sk_buff *skb, unsigned int offset, | |
2363 | struct pipe_inode_info *pipe, unsigned int len, | |
2364 | unsigned int flags); | |
2365 | void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to); | |
2366 | void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len); | |
2367 | int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen); | |
2368 | void skb_scrub_packet(struct sk_buff *skb, bool xnet); | |
7965bd4d | 2369 | struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features); |
20380731 | 2370 | |
2817a336 DB |
2371 | struct skb_checksum_ops { |
2372 | __wsum (*update)(const void *mem, int len, __wsum wsum); | |
2373 | __wsum (*combine)(__wsum csum, __wsum csum2, int offset, int len); | |
2374 | }; | |
2375 | ||
2376 | __wsum __skb_checksum(const struct sk_buff *skb, int offset, int len, | |
2377 | __wsum csum, const struct skb_checksum_ops *ops); | |
2378 | __wsum skb_checksum(const struct sk_buff *skb, int offset, int len, | |
2379 | __wsum csum); | |
2380 | ||
1da177e4 LT |
2381 | static inline void *skb_header_pointer(const struct sk_buff *skb, int offset, |
2382 | int len, void *buffer) | |
2383 | { | |
2384 | int hlen = skb_headlen(skb); | |
2385 | ||
55820ee2 | 2386 | if (hlen - offset >= len) |
1da177e4 LT |
2387 | return skb->data + offset; |
2388 | ||
2389 | if (skb_copy_bits(skb, offset, buffer, len) < 0) | |
2390 | return NULL; | |
2391 | ||
2392 | return buffer; | |
2393 | } | |
2394 | ||
d626f62b ACM |
2395 | static inline void skb_copy_from_linear_data(const struct sk_buff *skb, |
2396 | void *to, | |
2397 | const unsigned int len) | |
2398 | { | |
2399 | memcpy(to, skb->data, len); | |
2400 | } | |
2401 | ||
2402 | static inline void skb_copy_from_linear_data_offset(const struct sk_buff *skb, | |
2403 | const int offset, void *to, | |
2404 | const unsigned int len) | |
2405 | { | |
2406 | memcpy(to, skb->data + offset, len); | |
2407 | } | |
2408 | ||
27d7ff46 ACM |
2409 | static inline void skb_copy_to_linear_data(struct sk_buff *skb, |
2410 | const void *from, | |
2411 | const unsigned int len) | |
2412 | { | |
2413 | memcpy(skb->data, from, len); | |
2414 | } | |
2415 | ||
2416 | static inline void skb_copy_to_linear_data_offset(struct sk_buff *skb, | |
2417 | const int offset, | |
2418 | const void *from, | |
2419 | const unsigned int len) | |
2420 | { | |
2421 | memcpy(skb->data + offset, from, len); | |
2422 | } | |
2423 | ||
7965bd4d | 2424 | void skb_init(void); |
1da177e4 | 2425 | |
ac45f602 PO |
2426 | static inline ktime_t skb_get_ktime(const struct sk_buff *skb) |
2427 | { | |
2428 | return skb->tstamp; | |
2429 | } | |
2430 | ||
a61bbcf2 PM |
2431 | /** |
2432 | * skb_get_timestamp - get timestamp from a skb | |
2433 | * @skb: skb to get stamp from | |
2434 | * @stamp: pointer to struct timeval to store stamp in | |
2435 | * | |
2436 | * Timestamps are stored in the skb as offsets to a base timestamp. | |
2437 | * This function converts the offset back to a struct timeval and stores | |
2438 | * it in stamp. | |
2439 | */ | |
ac45f602 PO |
2440 | static inline void skb_get_timestamp(const struct sk_buff *skb, |
2441 | struct timeval *stamp) | |
a61bbcf2 | 2442 | { |
b7aa0bf7 | 2443 | *stamp = ktime_to_timeval(skb->tstamp); |
a61bbcf2 PM |
2444 | } |
2445 | ||
ac45f602 PO |
2446 | static inline void skb_get_timestampns(const struct sk_buff *skb, |
2447 | struct timespec *stamp) | |
2448 | { | |
2449 | *stamp = ktime_to_timespec(skb->tstamp); | |
2450 | } | |
2451 | ||
b7aa0bf7 | 2452 | static inline void __net_timestamp(struct sk_buff *skb) |
a61bbcf2 | 2453 | { |
b7aa0bf7 | 2454 | skb->tstamp = ktime_get_real(); |
a61bbcf2 PM |
2455 | } |
2456 | ||
164891aa SH |
2457 | static inline ktime_t net_timedelta(ktime_t t) |
2458 | { | |
2459 | return ktime_sub(ktime_get_real(), t); | |
2460 | } | |
2461 | ||
b9ce204f IJ |
2462 | static inline ktime_t net_invalid_timestamp(void) |
2463 | { | |
2464 | return ktime_set(0, 0); | |
2465 | } | |
a61bbcf2 | 2466 | |
7965bd4d | 2467 | void skb_timestamping_init(void); |
c1f19b51 RC |
2468 | |
2469 | #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING | |
2470 | ||
7965bd4d JP |
2471 | void skb_clone_tx_timestamp(struct sk_buff *skb); |
2472 | bool skb_defer_rx_timestamp(struct sk_buff *skb); | |
c1f19b51 RC |
2473 | |
2474 | #else /* CONFIG_NETWORK_PHY_TIMESTAMPING */ | |
2475 | ||
2476 | static inline void skb_clone_tx_timestamp(struct sk_buff *skb) | |
2477 | { | |
2478 | } | |
2479 | ||
2480 | static inline bool skb_defer_rx_timestamp(struct sk_buff *skb) | |
2481 | { | |
2482 | return false; | |
2483 | } | |
2484 | ||
2485 | #endif /* !CONFIG_NETWORK_PHY_TIMESTAMPING */ | |
2486 | ||
2487 | /** | |
2488 | * skb_complete_tx_timestamp() - deliver cloned skb with tx timestamps | |
2489 | * | |
da92b194 RC |
2490 | * PHY drivers may accept clones of transmitted packets for |
2491 | * timestamping via their phy_driver.txtstamp method. These drivers | |
2492 | * must call this function to return the skb back to the stack, with | |
2493 | * or without a timestamp. | |
2494 | * | |
c1f19b51 | 2495 | * @skb: clone of the the original outgoing packet |
da92b194 | 2496 | * @hwtstamps: hardware time stamps, may be NULL if not available |
c1f19b51 RC |
2497 | * |
2498 | */ | |
2499 | void skb_complete_tx_timestamp(struct sk_buff *skb, | |
2500 | struct skb_shared_hwtstamps *hwtstamps); | |
2501 | ||
ac45f602 PO |
2502 | /** |
2503 | * skb_tstamp_tx - queue clone of skb with send time stamps | |
2504 | * @orig_skb: the original outgoing packet | |
2505 | * @hwtstamps: hardware time stamps, may be NULL if not available | |
2506 | * | |
2507 | * If the skb has a socket associated, then this function clones the | |
2508 | * skb (thus sharing the actual data and optional structures), stores | |
2509 | * the optional hardware time stamping information (if non NULL) or | |
2510 | * generates a software time stamp (otherwise), then queues the clone | |
2511 | * to the error queue of the socket. Errors are silently ignored. | |
2512 | */ | |
7965bd4d JP |
2513 | void skb_tstamp_tx(struct sk_buff *orig_skb, |
2514 | struct skb_shared_hwtstamps *hwtstamps); | |
ac45f602 | 2515 | |
4507a715 RC |
2516 | static inline void sw_tx_timestamp(struct sk_buff *skb) |
2517 | { | |
2244d07b OH |
2518 | if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP && |
2519 | !(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) | |
4507a715 RC |
2520 | skb_tstamp_tx(skb, NULL); |
2521 | } | |
2522 | ||
2523 | /** | |
2524 | * skb_tx_timestamp() - Driver hook for transmit timestamping | |
2525 | * | |
2526 | * Ethernet MAC Drivers should call this function in their hard_xmit() | |
4ff75b7c | 2527 | * function immediately before giving the sk_buff to the MAC hardware. |
4507a715 RC |
2528 | * |
2529 | * @skb: A socket buffer. | |
2530 | */ | |
2531 | static inline void skb_tx_timestamp(struct sk_buff *skb) | |
2532 | { | |
c1f19b51 | 2533 | skb_clone_tx_timestamp(skb); |
4507a715 RC |
2534 | sw_tx_timestamp(skb); |
2535 | } | |
2536 | ||
6e3e939f JB |
2537 | /** |
2538 | * skb_complete_wifi_ack - deliver skb with wifi status | |
2539 | * | |
2540 | * @skb: the original outgoing packet | |
2541 | * @acked: ack status | |
2542 | * | |
2543 | */ | |
2544 | void skb_complete_wifi_ack(struct sk_buff *skb, bool acked); | |
2545 | ||
7965bd4d JP |
2546 | __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len); |
2547 | __sum16 __skb_checksum_complete(struct sk_buff *skb); | |
fb286bb2 | 2548 | |
60476372 HX |
2549 | static inline int skb_csum_unnecessary(const struct sk_buff *skb) |
2550 | { | |
2551 | return skb->ip_summed & CHECKSUM_UNNECESSARY; | |
2552 | } | |
2553 | ||
fb286bb2 HX |
2554 | /** |
2555 | * skb_checksum_complete - Calculate checksum of an entire packet | |
2556 | * @skb: packet to process | |
2557 | * | |
2558 | * This function calculates the checksum over the entire packet plus | |
2559 | * the value of skb->csum. The latter can be used to supply the | |
2560 | * checksum of a pseudo header as used by TCP/UDP. It returns the | |
2561 | * checksum. | |
2562 | * | |
2563 | * For protocols that contain complete checksums such as ICMP/TCP/UDP, | |
2564 | * this function can be used to verify that checksum on received | |
2565 | * packets. In that case the function should return zero if the | |
2566 | * checksum is correct. In particular, this function will return zero | |
2567 | * if skb->ip_summed is CHECKSUM_UNNECESSARY which indicates that the | |
2568 | * hardware has already verified the correctness of the checksum. | |
2569 | */ | |
4381ca3c | 2570 | static inline __sum16 skb_checksum_complete(struct sk_buff *skb) |
fb286bb2 | 2571 | { |
60476372 HX |
2572 | return skb_csum_unnecessary(skb) ? |
2573 | 0 : __skb_checksum_complete(skb); | |
fb286bb2 HX |
2574 | } |
2575 | ||
5f79e0f9 | 2576 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
7965bd4d | 2577 | void nf_conntrack_destroy(struct nf_conntrack *nfct); |
1da177e4 LT |
2578 | static inline void nf_conntrack_put(struct nf_conntrack *nfct) |
2579 | { | |
2580 | if (nfct && atomic_dec_and_test(&nfct->use)) | |
de6e05c4 | 2581 | nf_conntrack_destroy(nfct); |
1da177e4 LT |
2582 | } |
2583 | static inline void nf_conntrack_get(struct nf_conntrack *nfct) | |
2584 | { | |
2585 | if (nfct) | |
2586 | atomic_inc(&nfct->use); | |
2587 | } | |
2fc72c7b | 2588 | #endif |
1da177e4 LT |
2589 | #ifdef CONFIG_BRIDGE_NETFILTER |
2590 | static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge) | |
2591 | { | |
2592 | if (nf_bridge && atomic_dec_and_test(&nf_bridge->use)) | |
2593 | kfree(nf_bridge); | |
2594 | } | |
2595 | static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge) | |
2596 | { | |
2597 | if (nf_bridge) | |
2598 | atomic_inc(&nf_bridge->use); | |
2599 | } | |
2600 | #endif /* CONFIG_BRIDGE_NETFILTER */ | |
a193a4ab PM |
2601 | static inline void nf_reset(struct sk_buff *skb) |
2602 | { | |
5f79e0f9 | 2603 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
a193a4ab PM |
2604 | nf_conntrack_put(skb->nfct); |
2605 | skb->nfct = NULL; | |
2fc72c7b | 2606 | #endif |
a193a4ab PM |
2607 | #ifdef CONFIG_BRIDGE_NETFILTER |
2608 | nf_bridge_put(skb->nf_bridge); | |
2609 | skb->nf_bridge = NULL; | |
2610 | #endif | |
2611 | } | |
2612 | ||
124dff01 PM |
2613 | static inline void nf_reset_trace(struct sk_buff *skb) |
2614 | { | |
130549fe G |
2615 | #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) |
2616 | skb->nf_trace = 0; | |
2617 | #endif | |
a193a4ab PM |
2618 | } |
2619 | ||
edda553c YK |
2620 | /* Note: This doesn't put any conntrack and bridge info in dst. */ |
2621 | static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src) | |
2622 | { | |
5f79e0f9 | 2623 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
edda553c YK |
2624 | dst->nfct = src->nfct; |
2625 | nf_conntrack_get(src->nfct); | |
2626 | dst->nfctinfo = src->nfctinfo; | |
2fc72c7b | 2627 | #endif |
edda553c YK |
2628 | #ifdef CONFIG_BRIDGE_NETFILTER |
2629 | dst->nf_bridge = src->nf_bridge; | |
2630 | nf_bridge_get(src->nf_bridge); | |
2631 | #endif | |
2632 | } | |
2633 | ||
e7ac05f3 YK |
2634 | static inline void nf_copy(struct sk_buff *dst, const struct sk_buff *src) |
2635 | { | |
e7ac05f3 | 2636 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
5f79e0f9 | 2637 | nf_conntrack_put(dst->nfct); |
2fc72c7b | 2638 | #endif |
e7ac05f3 YK |
2639 | #ifdef CONFIG_BRIDGE_NETFILTER |
2640 | nf_bridge_put(dst->nf_bridge); | |
2641 | #endif | |
2642 | __nf_copy(dst, src); | |
2643 | } | |
2644 | ||
984bc16c JM |
2645 | #ifdef CONFIG_NETWORK_SECMARK |
2646 | static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from) | |
2647 | { | |
2648 | to->secmark = from->secmark; | |
2649 | } | |
2650 | ||
2651 | static inline void skb_init_secmark(struct sk_buff *skb) | |
2652 | { | |
2653 | skb->secmark = 0; | |
2654 | } | |
2655 | #else | |
2656 | static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from) | |
2657 | { } | |
2658 | ||
2659 | static inline void skb_init_secmark(struct sk_buff *skb) | |
2660 | { } | |
2661 | #endif | |
2662 | ||
f25f4e44 PWJ |
2663 | static inline void skb_set_queue_mapping(struct sk_buff *skb, u16 queue_mapping) |
2664 | { | |
f25f4e44 | 2665 | skb->queue_mapping = queue_mapping; |
f25f4e44 PWJ |
2666 | } |
2667 | ||
9247744e | 2668 | static inline u16 skb_get_queue_mapping(const struct sk_buff *skb) |
4e3ab47a | 2669 | { |
4e3ab47a | 2670 | return skb->queue_mapping; |
4e3ab47a PE |
2671 | } |
2672 | ||
f25f4e44 PWJ |
2673 | static inline void skb_copy_queue_mapping(struct sk_buff *to, const struct sk_buff *from) |
2674 | { | |
f25f4e44 | 2675 | to->queue_mapping = from->queue_mapping; |
f25f4e44 PWJ |
2676 | } |
2677 | ||
d5a9e24a DM |
2678 | static inline void skb_record_rx_queue(struct sk_buff *skb, u16 rx_queue) |
2679 | { | |
2680 | skb->queue_mapping = rx_queue + 1; | |
2681 | } | |
2682 | ||
9247744e | 2683 | static inline u16 skb_get_rx_queue(const struct sk_buff *skb) |
d5a9e24a DM |
2684 | { |
2685 | return skb->queue_mapping - 1; | |
2686 | } | |
2687 | ||
9247744e | 2688 | static inline bool skb_rx_queue_recorded(const struct sk_buff *skb) |
d5a9e24a | 2689 | { |
a02cec21 | 2690 | return skb->queue_mapping != 0; |
d5a9e24a DM |
2691 | } |
2692 | ||
7965bd4d JP |
2693 | u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb, |
2694 | unsigned int num_tx_queues); | |
9247744e | 2695 | |
def8b4fa AD |
2696 | static inline struct sec_path *skb_sec_path(struct sk_buff *skb) |
2697 | { | |
0b3d8e08 | 2698 | #ifdef CONFIG_XFRM |
def8b4fa | 2699 | return skb->sp; |
def8b4fa | 2700 | #else |
def8b4fa | 2701 | return NULL; |
def8b4fa | 2702 | #endif |
0b3d8e08 | 2703 | } |
def8b4fa | 2704 | |
68c33163 PS |
2705 | /* Keeps track of mac header offset relative to skb->head. |
2706 | * It is useful for TSO of Tunneling protocol. e.g. GRE. | |
2707 | * For non-tunnel skb it points to skb_mac_header() and for | |
3347c960 ED |
2708 | * tunnel skb it points to outer mac header. |
2709 | * Keeps track of level of encapsulation of network headers. | |
2710 | */ | |
68c33163 | 2711 | struct skb_gso_cb { |
3347c960 ED |
2712 | int mac_offset; |
2713 | int encap_level; | |
68c33163 PS |
2714 | }; |
2715 | #define SKB_GSO_CB(skb) ((struct skb_gso_cb *)(skb)->cb) | |
2716 | ||
2717 | static inline int skb_tnl_header_len(const struct sk_buff *inner_skb) | |
2718 | { | |
2719 | return (skb_mac_header(inner_skb) - inner_skb->head) - | |
2720 | SKB_GSO_CB(inner_skb)->mac_offset; | |
2721 | } | |
2722 | ||
1e2bd517 PS |
2723 | static inline int gso_pskb_expand_head(struct sk_buff *skb, int extra) |
2724 | { | |
2725 | int new_headroom, headroom; | |
2726 | int ret; | |
2727 | ||
2728 | headroom = skb_headroom(skb); | |
2729 | ret = pskb_expand_head(skb, extra, 0, GFP_ATOMIC); | |
2730 | if (ret) | |
2731 | return ret; | |
2732 | ||
2733 | new_headroom = skb_headroom(skb); | |
2734 | SKB_GSO_CB(skb)->mac_offset += (new_headroom - headroom); | |
2735 | return 0; | |
2736 | } | |
2737 | ||
bdcc0924 | 2738 | static inline bool skb_is_gso(const struct sk_buff *skb) |
89114afd HX |
2739 | { |
2740 | return skb_shinfo(skb)->gso_size; | |
2741 | } | |
2742 | ||
36a8f39e | 2743 | /* Note: Should be called only if skb_is_gso(skb) is true */ |
bdcc0924 | 2744 | static inline bool skb_is_gso_v6(const struct sk_buff *skb) |
eabd7e35 BG |
2745 | { |
2746 | return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6; | |
2747 | } | |
2748 | ||
7965bd4d | 2749 | void __skb_warn_lro_forwarding(const struct sk_buff *skb); |
4497b076 BH |
2750 | |
2751 | static inline bool skb_warn_if_lro(const struct sk_buff *skb) | |
2752 | { | |
2753 | /* LRO sets gso_size but not gso_type, whereas if GSO is really | |
2754 | * wanted then gso_type will be set. */ | |
05bdd2f1 ED |
2755 | const struct skb_shared_info *shinfo = skb_shinfo(skb); |
2756 | ||
b78462eb AD |
2757 | if (skb_is_nonlinear(skb) && shinfo->gso_size != 0 && |
2758 | unlikely(shinfo->gso_type == 0)) { | |
4497b076 BH |
2759 | __skb_warn_lro_forwarding(skb); |
2760 | return true; | |
2761 | } | |
2762 | return false; | |
2763 | } | |
2764 | ||
35fc92a9 HX |
2765 | static inline void skb_forward_csum(struct sk_buff *skb) |
2766 | { | |
2767 | /* Unfortunately we don't support this one. Any brave souls? */ | |
2768 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
2769 | skb->ip_summed = CHECKSUM_NONE; | |
2770 | } | |
2771 | ||
bc8acf2c ED |
2772 | /** |
2773 | * skb_checksum_none_assert - make sure skb ip_summed is CHECKSUM_NONE | |
2774 | * @skb: skb to check | |
2775 | * | |
2776 | * fresh skbs have their ip_summed set to CHECKSUM_NONE. | |
2777 | * Instead of forcing ip_summed to CHECKSUM_NONE, we can | |
2778 | * use this helper, to document places where we make this assertion. | |
2779 | */ | |
05bdd2f1 | 2780 | static inline void skb_checksum_none_assert(const struct sk_buff *skb) |
bc8acf2c ED |
2781 | { |
2782 | #ifdef DEBUG | |
2783 | BUG_ON(skb->ip_summed != CHECKSUM_NONE); | |
2784 | #endif | |
2785 | } | |
2786 | ||
f35d9d8a | 2787 | bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off); |
a6686f2f | 2788 | |
f77668dc DB |
2789 | u32 __skb_get_poff(const struct sk_buff *skb); |
2790 | ||
3a7c1ee4 AD |
2791 | /** |
2792 | * skb_head_is_locked - Determine if the skb->head is locked down | |
2793 | * @skb: skb to check | |
2794 | * | |
2795 | * The head on skbs build around a head frag can be removed if they are | |
2796 | * not cloned. This function returns true if the skb head is locked down | |
2797 | * due to either being allocated via kmalloc, or by being a clone with | |
2798 | * multiple references to the head. | |
2799 | */ | |
2800 | static inline bool skb_head_is_locked(const struct sk_buff *skb) | |
2801 | { | |
2802 | return !skb->head_frag || skb_cloned(skb); | |
2803 | } | |
1da177e4 LT |
2804 | #endif /* __KERNEL__ */ |
2805 | #endif /* _LINUX_SKBUFF_H */ |