Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/kernel.h> |
| 18 | #include <linux/compiler.h> |
| 19 | #include <linux/time.h> |
| 20 | #include <linux/cache.h> |
| 21 | |
| 22 | #include <asm/atomic.h> |
| 23 | #include <asm/types.h> |
| 24 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/net.h> |
Thomas Graf | 3fc7e8a | 2005-06-23 21:00:17 -0700 | [diff] [blame] | 26 | #include <linux/textsearch.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <net/checksum.h> |
Al Viro | a80958f | 2006-12-04 20:41:19 +0000 | [diff] [blame] | 28 | #include <linux/rcupdate.h> |
Chris Leech | 97fc2f0 | 2006-05-23 17:55:33 -0700 | [diff] [blame] | 29 | #include <linux/dmaengine.h> |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 30 | #include <linux/hrtimer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 32 | /* Don't change this without changing skb_csum_unnecessary! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #define CHECKSUM_NONE 0 |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 34 | #define CHECKSUM_UNNECESSARY 1 |
| 35 | #define CHECKSUM_COMPLETE 2 |
| 36 | #define CHECKSUM_PARTIAL 3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #define SKB_DATA_ALIGN(X) (((X) + (SMP_CACHE_BYTES - 1)) & \ |
| 39 | ~(SMP_CACHE_BYTES - 1)) |
David S. Miller | fc910a2 | 2007-03-25 20:27:59 -0700 | [diff] [blame] | 40 | #define SKB_WITH_OVERHEAD(X) \ |
Herbert Xu | deea84b | 2007-10-21 16:27:46 -0700 | [diff] [blame] | 41 | ((X) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) |
David S. Miller | fc910a2 | 2007-03-25 20:27:59 -0700 | [diff] [blame] | 42 | #define SKB_MAX_ORDER(X, ORDER) \ |
| 43 | SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #define SKB_MAX_HEAD(X) (SKB_MAX_ORDER((X), 0)) |
| 45 | #define SKB_MAX_ALLOC (SKB_MAX_ORDER(0, 2)) |
| 46 | |
| 47 | /* A. Checksumming of received packets by device. |
| 48 | * |
| 49 | * NONE: device failed to checksum this packet. |
| 50 | * skb->csum is undefined. |
| 51 | * |
| 52 | * UNNECESSARY: device parsed packet and wouldbe verified checksum. |
| 53 | * skb->csum is undefined. |
| 54 | * It is bad option, but, unfortunately, many of vendors do this. |
| 55 | * Apparently with secret goal to sell you new device, when you |
| 56 | * will add new protocol to your host. F.e. IPv6. 8) |
| 57 | * |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 58 | * COMPLETE: the most generic way. Device supplied checksum of _all_ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | * the packet as seen by netif_rx in skb->csum. |
| 60 | * NOTE: Even if device supports only some protocols, but |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 61 | * is able to produce some skb->csum, it MUST use COMPLETE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | * not UNNECESSARY. |
| 63 | * |
Herbert Xu | c6c6e3e | 2007-07-10 22:41:55 -0700 | [diff] [blame] | 64 | * PARTIAL: identical to the case for output below. This may occur |
| 65 | * on a packet received directly from another Linux OS, e.g., |
| 66 | * a virtualised Linux kernel on the same host. The packet can |
| 67 | * be treated in the same way as UNNECESSARY except that on |
| 68 | * output (i.e., forwarding) the checksum must be filled in |
| 69 | * by the OS or the hardware. |
| 70 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | * B. Checksumming on output. |
| 72 | * |
| 73 | * NONE: skb is checksummed by protocol or csum is not required. |
| 74 | * |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 75 | * PARTIAL: device is required to csum packet as seen by hard_start_xmit |
Herbert Xu | c6c6e3e | 2007-07-10 22:41:55 -0700 | [diff] [blame] | 76 | * from skb->csum_start to the end and to record the checksum |
| 77 | * at skb->csum_start + skb->csum_offset. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | * |
| 79 | * Device must show its capabilities in dev->features, set |
| 80 | * at device setup time. |
| 81 | * NETIF_F_HW_CSUM - it is clever device, it is able to checksum |
| 82 | * everything. |
| 83 | * NETIF_F_NO_CSUM - loopback or reliable single hop media. |
| 84 | * NETIF_F_IP_CSUM - device is dumb. It is able to csum only |
| 85 | * TCP/UDP over IPv4. Sigh. Vendors like this |
| 86 | * way by an unknown reason. Though, see comment above |
| 87 | * about CHECKSUM_UNNECESSARY. 8) |
Herbert Xu | c6c6e3e | 2007-07-10 22:41:55 -0700 | [diff] [blame] | 88 | * NETIF_F_IPV6_CSUM about as dumb as the last one but does IPv6 instead. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | * |
| 90 | * Any questions? No questions, good. --ANK |
| 91 | */ |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | struct net_device; |
David Howells | 716ea3a | 2007-04-02 20:19:53 -0700 | [diff] [blame] | 94 | struct scatterlist; |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 95 | struct pipe_inode_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Yasuyuki Kozakai | 5f79e0f | 2007-03-23 11:17:07 -0700 | [diff] [blame] | 97 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | struct nf_conntrack { |
| 99 | atomic_t use; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | }; |
Yasuyuki Kozakai | 5f79e0f | 2007-03-23 11:17:07 -0700 | [diff] [blame] | 101 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 104 | struct nf_bridge_info { |
| 105 | atomic_t use; |
| 106 | struct net_device *physindev; |
| 107 | struct net_device *physoutdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | unsigned int mask; |
| 109 | unsigned long data[32 / sizeof(unsigned long)]; |
| 110 | }; |
| 111 | #endif |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | struct sk_buff_head { |
| 114 | /* These two members must be first. */ |
| 115 | struct sk_buff *next; |
| 116 | struct sk_buff *prev; |
| 117 | |
| 118 | __u32 qlen; |
| 119 | spinlock_t lock; |
| 120 | }; |
| 121 | |
| 122 | struct sk_buff; |
| 123 | |
| 124 | /* To allow 64K frame to be packed as single skb without frag_list */ |
| 125 | #define MAX_SKB_FRAGS (65536/PAGE_SIZE + 2) |
| 126 | |
| 127 | typedef struct skb_frag_struct skb_frag_t; |
| 128 | |
| 129 | struct skb_frag_struct { |
| 130 | struct page *page; |
David S. Miller | a309bb0 | 2007-07-30 18:47:03 -0700 | [diff] [blame] | 131 | __u32 page_offset; |
| 132 | __u32 size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | }; |
| 134 | |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 135 | #define HAVE_HW_TIME_STAMP |
| 136 | |
| 137 | /** |
Randy Dunlap | d3a21be | 2009-03-02 03:15:58 -0800 | [diff] [blame] | 138 | * struct skb_shared_hwtstamps - hardware time stamps |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 139 | * @hwtstamp: hardware time stamp transformed into duration |
| 140 | * since arbitrary point in time |
| 141 | * @syststamp: hwtstamp transformed to system time base |
| 142 | * |
| 143 | * Software time stamps generated by ktime_get_real() are stored in |
| 144 | * skb->tstamp. The relation between the different kinds of time |
| 145 | * stamps is as follows: |
| 146 | * |
| 147 | * syststamp and tstamp can be compared against each other in |
| 148 | * arbitrary combinations. The accuracy of a |
| 149 | * syststamp/tstamp/"syststamp from other device" comparison is |
| 150 | * limited by the accuracy of the transformation into system time |
| 151 | * base. This depends on the device driver and its underlying |
| 152 | * hardware. |
| 153 | * |
| 154 | * hwtstamps can only be compared against other hwtstamps from |
| 155 | * the same device. |
| 156 | * |
| 157 | * This structure is attached to packets as part of the |
| 158 | * &skb_shared_info. Use skb_hwtstamps() to get a pointer. |
| 159 | */ |
| 160 | struct skb_shared_hwtstamps { |
| 161 | ktime_t hwtstamp; |
| 162 | ktime_t syststamp; |
| 163 | }; |
| 164 | |
| 165 | /** |
Randy Dunlap | d3a21be | 2009-03-02 03:15:58 -0800 | [diff] [blame] | 166 | * struct skb_shared_tx - instructions for time stamping of outgoing packets |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 167 | * @hardware: generate hardware time stamp |
| 168 | * @software: generate software time stamp |
| 169 | * @in_progress: device driver is going to provide |
| 170 | * hardware time stamp |
Randy Dunlap | 4b21cd4 | 2009-03-28 23:38:40 -0700 | [diff] [blame] | 171 | * @flags: all shared_tx flags |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 172 | * |
| 173 | * These flags are attached to packets as part of the |
| 174 | * &skb_shared_info. Use skb_tx() to get a pointer. |
| 175 | */ |
| 176 | union skb_shared_tx { |
| 177 | struct { |
| 178 | __u8 hardware:1, |
| 179 | software:1, |
| 180 | in_progress:1; |
| 181 | }; |
| 182 | __u8 flags; |
| 183 | }; |
| 184 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | /* This data is invariant across clones and lives at |
| 186 | * the end of the header data, ie. at skb->end. |
| 187 | */ |
| 188 | struct skb_shared_info { |
| 189 | atomic_t dataref; |
Benjamin LaHaise | 4947d3e | 2006-01-03 14:06:50 -0800 | [diff] [blame] | 190 | unsigned short nr_frags; |
Herbert Xu | 7967168 | 2006-06-22 02:40:14 -0700 | [diff] [blame] | 191 | unsigned short gso_size; |
Eric Dumazet | 042a53a | 2009-06-05 04:04:16 +0000 | [diff] [blame] | 192 | #ifdef CONFIG_HAS_DMA |
| 193 | dma_addr_t dma_head; |
| 194 | #endif |
Herbert Xu | 7967168 | 2006-06-22 02:40:14 -0700 | [diff] [blame] | 195 | /* Warning: this field is not always filled in (UFO)! */ |
| 196 | unsigned short gso_segs; |
| 197 | unsigned short gso_type; |
Al Viro | ae08e1f | 2006-11-08 00:27:11 -0800 | [diff] [blame] | 198 | __be32 ip6_frag_id; |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 199 | union skb_shared_tx tx_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | struct sk_buff *frag_list; |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 201 | struct skb_shared_hwtstamps hwtstamps; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | skb_frag_t frags[MAX_SKB_FRAGS]; |
David S. Miller | 271bff7 | 2008-09-11 04:48:58 -0700 | [diff] [blame] | 203 | #ifdef CONFIG_HAS_DMA |
Eric Dumazet | 042a53a | 2009-06-05 04:04:16 +0000 | [diff] [blame] | 204 | dma_addr_t dma_maps[MAX_SKB_FRAGS]; |
David S. Miller | 271bff7 | 2008-09-11 04:48:58 -0700 | [diff] [blame] | 205 | #endif |
Johann Baudy | 69e3c75 | 2009-05-18 22:11:22 -0700 | [diff] [blame] | 206 | /* Intermediate layers must ensure that destructor_arg |
| 207 | * remains valid until skb destructor */ |
| 208 | void * destructor_arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | }; |
| 210 | |
| 211 | /* We divide dataref into two halves. The higher 16 bits hold references |
| 212 | * to the payload part of skb->data. The lower 16 bits hold references to |
Patrick McHardy | 334a813 | 2007-06-25 04:35:20 -0700 | [diff] [blame] | 213 | * the entire skb->data. A clone of a headerless skb holds the length of |
| 214 | * the header in skb->hdr_len. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | * |
| 216 | * All users must obey the rule that the skb->data reference count must be |
| 217 | * greater than or equal to the payload reference count. |
| 218 | * |
| 219 | * Holding a reference to the payload part means that the user does not |
| 220 | * care about modifications to the header part of skb->data. |
| 221 | */ |
| 222 | #define SKB_DATAREF_SHIFT 16 |
| 223 | #define SKB_DATAREF_MASK ((1 << SKB_DATAREF_SHIFT) - 1) |
| 224 | |
David S. Miller | d179cd1 | 2005-08-17 14:57:30 -0700 | [diff] [blame] | 225 | |
| 226 | enum { |
| 227 | SKB_FCLONE_UNAVAILABLE, |
| 228 | SKB_FCLONE_ORIG, |
| 229 | SKB_FCLONE_CLONE, |
| 230 | }; |
| 231 | |
Herbert Xu | 7967168 | 2006-06-22 02:40:14 -0700 | [diff] [blame] | 232 | enum { |
| 233 | SKB_GSO_TCPV4 = 1 << 0, |
Herbert Xu | f83ef8c | 2006-06-30 13:37:03 -0700 | [diff] [blame] | 234 | SKB_GSO_UDP = 1 << 1, |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 235 | |
| 236 | /* This indicates the skb is from an untrusted source. */ |
| 237 | SKB_GSO_DODGY = 1 << 2, |
Michael Chan | b0da8537 | 2006-06-29 12:30:00 -0700 | [diff] [blame] | 238 | |
| 239 | /* This indicates the tcp segment has CWR set. */ |
Herbert Xu | f83ef8c | 2006-06-30 13:37:03 -0700 | [diff] [blame] | 240 | SKB_GSO_TCP_ECN = 1 << 3, |
| 241 | |
| 242 | SKB_GSO_TCPV6 = 1 << 4, |
Chris Leech | 01d5b2f | 2009-02-27 14:06:49 -0800 | [diff] [blame] | 243 | |
| 244 | SKB_GSO_FCOE = 1 << 5, |
Herbert Xu | 7967168 | 2006-06-22 02:40:14 -0700 | [diff] [blame] | 245 | }; |
| 246 | |
Arnaldo Carvalho de Melo | 2e07fa9 | 2007-04-10 21:22:35 -0700 | [diff] [blame] | 247 | #if BITS_PER_LONG > 32 |
| 248 | #define NET_SKBUFF_DATA_USES_OFFSET 1 |
| 249 | #endif |
| 250 | |
| 251 | #ifdef NET_SKBUFF_DATA_USES_OFFSET |
| 252 | typedef unsigned int sk_buff_data_t; |
| 253 | #else |
| 254 | typedef unsigned char *sk_buff_data_t; |
| 255 | #endif |
| 256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | /** |
| 258 | * struct sk_buff - socket buffer |
| 259 | * @next: Next buffer in list |
| 260 | * @prev: Previous buffer in list |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | * @sk: Socket we are owned by |
Herbert Xu | 325ed82 | 2005-10-03 13:57:23 -0700 | [diff] [blame] | 262 | * @tstamp: Time we arrived |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | * @dev: Device we arrived on/are leaving by |
Randy Dunlap | be52178 | 2007-05-03 03:16:20 -0700 | [diff] [blame] | 264 | * @transport_header: Transport layer header |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 265 | * @network_header: Network layer header |
| 266 | * @mac_header: Link layer header |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 267 | * @dst: destination entry |
| 268 | * @sp: the security path, used for xfrm |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | * @cb: Control buffer. Free for use by every layer. Put private vars here |
| 270 | * @len: Length of actual data |
| 271 | * @data_len: Data length |
| 272 | * @mac_len: Length of link layer header |
Patrick McHardy | 334a813 | 2007-06-25 04:35:20 -0700 | [diff] [blame] | 273 | * @hdr_len: writable header length of cloned skb |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 274 | * @csum: Checksum (must include start/offset pair) |
| 275 | * @csum_start: Offset from skb->head where checksumming should start |
| 276 | * @csum_offset: Offset from csum_start where checksum should be stored |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 277 | * @local_df: allow local fragmentation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | * @cloned: Head may be cloned (check refcnt to be sure) |
| 279 | * @nohdr: Payload reference only, must not modify header |
| 280 | * @pkt_type: Packet class |
Randy Dunlap | c83c248 | 2005-10-18 22:07:41 -0700 | [diff] [blame] | 281 | * @fclone: skbuff clone status |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | * @ip_summed: Driver fed us an IP checksum |
| 283 | * @priority: Packet queueing priority |
| 284 | * @users: User count - see {datagram,tcp}.c |
| 285 | * @protocol: Packet protocol from driver |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | * @truesize: Buffer size |
| 287 | * @head: Head of buffer |
| 288 | * @data: Data head pointer |
| 289 | * @tail: Tail pointer |
| 290 | * @end: End pointer |
| 291 | * @destructor: Destruct function |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 292 | * @mark: Generic packet mark |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | * @nfct: Associated connection, if any |
Randy Dunlap | c83c248 | 2005-10-18 22:07:41 -0700 | [diff] [blame] | 294 | * @ipvs_property: skbuff is owned by ipvs |
Randy Dunlap | 3172936 | 2008-02-18 20:52:13 -0800 | [diff] [blame] | 295 | * @peeked: this packet has been seen already, so stats have been |
| 296 | * done for it, don't do them again |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 297 | * @nf_trace: netfilter packet trace flag |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | * @nfctinfo: Relationship of this skb to the connection |
Randy Dunlap | 461ddf3 | 2005-11-20 21:25:15 -0800 | [diff] [blame] | 299 | * @nfct_reasm: netfilter conntrack re-assembly pointer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | * @nf_bridge: Saved data about a bridged frame - see br_netfilter.c |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 301 | * @iif: ifindex of device we arrived on |
| 302 | * @queue_mapping: Queue mapping for multiqueue devices |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | * @tc_index: Traffic control index |
| 304 | * @tc_verd: traffic control verdict |
Randy Dunlap | 553a567 | 2008-04-20 10:51:01 -0700 | [diff] [blame] | 305 | * @ndisc_nodetype: router type (from link layer) |
Randy Dunlap | 4a7b61d | 2008-07-31 20:52:08 -0700 | [diff] [blame] | 306 | * @do_not_encrypt: set to prevent encryption of this frame |
Randy Dunlap | f4b8ea7 | 2006-06-22 16:00:11 -0700 | [diff] [blame] | 307 | * @dma_cookie: a cookie to one of several possible DMA operations |
| 308 | * done by skb DMA functions |
James Morris | 984bc16 | 2006-06-09 00:29:17 -0700 | [diff] [blame] | 309 | * @secmark: security marking |
Patrick McHardy | 6aa895b | 2008-07-14 22:49:06 -0700 | [diff] [blame] | 310 | * @vlan_tci: vlan tag control information |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | */ |
| 312 | |
| 313 | struct sk_buff { |
| 314 | /* These two members must be first. */ |
| 315 | struct sk_buff *next; |
| 316 | struct sk_buff *prev; |
| 317 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | struct sock *sk; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 319 | ktime_t tstamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
Eric Dumazet | e5b9215 | 2009-06-02 05:20:21 +0000 | [diff] [blame] | 322 | unsigned long _skb_dst; |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 323 | #ifdef CONFIG_XFRM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | struct sec_path *sp; |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 325 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | /* |
| 327 | * This is the control buffer. It is free to use for every |
| 328 | * layer. Please put your private variables there. If you |
| 329 | * want to keep them across layers you have to do a skb_clone() |
| 330 | * first. This is owned by whoever has the skb queued ATM. |
| 331 | */ |
Patrick McHardy | 3e3850e | 2006-01-06 23:04:54 -0800 | [diff] [blame] | 332 | char cb[48]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
| 334 | unsigned int len, |
Patrick McHardy | 334a813 | 2007-06-25 04:35:20 -0700 | [diff] [blame] | 335 | data_len; |
| 336 | __u16 mac_len, |
| 337 | hdr_len; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 338 | union { |
| 339 | __wsum csum; |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 340 | struct { |
| 341 | __u16 csum_start; |
| 342 | __u16 csum_offset; |
| 343 | }; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 344 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | __u32 priority; |
Thomas Graf | 1cbb338 | 2005-07-05 14:13:41 -0700 | [diff] [blame] | 346 | __u8 local_df:1, |
| 347 | cloned:1, |
| 348 | ip_summed:2, |
Harald Welte | 6869c4d | 2005-08-09 19:24:19 -0700 | [diff] [blame] | 349 | nohdr:1, |
| 350 | nfctinfo:3; |
David S. Miller | d179cd1 | 2005-08-17 14:57:30 -0700 | [diff] [blame] | 351 | __u8 pkt_type:3, |
Patrick McHardy | b84f4cc | 2005-11-20 21:19:21 -0800 | [diff] [blame] | 352 | fclone:2, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 353 | ipvs_property:1, |
Herbert Xu | a59322b | 2007-12-05 01:53:40 -0800 | [diff] [blame] | 354 | peeked:1, |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 355 | nf_trace:1; |
Alexey Dobriyan | a0d3bea | 2005-08-11 16:05:50 -0700 | [diff] [blame] | 356 | __be16 protocol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
| 358 | void (*destructor)(struct sk_buff *skb); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 359 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
Yasuyuki Kozakai | 5f79e0f | 2007-03-23 11:17:07 -0700 | [diff] [blame] | 360 | struct nf_conntrack *nfct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 361 | struct sk_buff *nfct_reasm; |
| 362 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 364 | struct nf_bridge_info *nf_bridge; |
| 365 | #endif |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 366 | |
| 367 | int iif; |
| 368 | __u16 queue_mapping; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | #ifdef CONFIG_NET_SCHED |
Patrick McHardy | b6b99eb | 2005-08-09 19:33:51 -0700 | [diff] [blame] | 370 | __u16 tc_index; /* traffic control index */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | #ifdef CONFIG_NET_CLS_ACT |
Patrick McHardy | b6b99eb | 2005-08-09 19:33:51 -0700 | [diff] [blame] | 372 | __u16 tc_verd; /* traffic control verdict */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | #endif |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 375 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
Templin, Fred L | fadf6bf | 2008-03-11 18:35:59 -0400 | [diff] [blame] | 376 | __u8 ndisc_nodetype:2; |
YOSHIFUJI Hideaki | de357cc | 2008-03-15 23:59:18 -0400 | [diff] [blame] | 377 | #endif |
Johannes Berg | d0f0980 | 2008-07-29 11:32:07 +0200 | [diff] [blame] | 378 | #if defined(CONFIG_MAC80211) || defined(CONFIG_MAC80211_MODULE) |
| 379 | __u8 do_not_encrypt:1; |
| 380 | #endif |
| 381 | /* 0/13/14 bit hole */ |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 382 | |
Chris Leech | 97fc2f0 | 2006-05-23 17:55:33 -0700 | [diff] [blame] | 383 | #ifdef CONFIG_NET_DMA |
| 384 | dma_cookie_t dma_cookie; |
| 385 | #endif |
James Morris | 984bc16 | 2006-06-09 00:29:17 -0700 | [diff] [blame] | 386 | #ifdef CONFIG_NETWORK_SECMARK |
| 387 | __u32 secmark; |
| 388 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 390 | __u32 mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
Patrick McHardy | 6aa895b | 2008-07-14 22:49:06 -0700 | [diff] [blame] | 392 | __u16 vlan_tci; |
| 393 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 394 | sk_buff_data_t transport_header; |
| 395 | sk_buff_data_t network_header; |
| 396 | sk_buff_data_t mac_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | /* These elements must be at the end, see alloc_skb() for details. */ |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 398 | sk_buff_data_t tail; |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 399 | sk_buff_data_t end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | unsigned char *head, |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 401 | *data; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 402 | unsigned int truesize; |
| 403 | atomic_t users; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | }; |
| 405 | |
| 406 | #ifdef __KERNEL__ |
| 407 | /* |
| 408 | * Handling routines are only of interest to the kernel |
| 409 | */ |
| 410 | #include <linux/slab.h> |
| 411 | |
| 412 | #include <asm/system.h> |
| 413 | |
David S. Miller | a40c24a | 2008-09-11 04:51:14 -0700 | [diff] [blame] | 414 | #ifdef CONFIG_HAS_DMA |
| 415 | #include <linux/dma-mapping.h> |
| 416 | extern int skb_dma_map(struct device *dev, struct sk_buff *skb, |
| 417 | enum dma_data_direction dir); |
| 418 | extern void skb_dma_unmap(struct device *dev, struct sk_buff *skb, |
| 419 | enum dma_data_direction dir); |
| 420 | #endif |
| 421 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 422 | static inline struct dst_entry *skb_dst(const struct sk_buff *skb) |
| 423 | { |
| 424 | return (struct dst_entry *)skb->_skb_dst; |
| 425 | } |
| 426 | |
| 427 | static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst) |
| 428 | { |
| 429 | skb->_skb_dst = (unsigned long)dst; |
| 430 | } |
| 431 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 432 | static inline struct rtable *skb_rtable(const struct sk_buff *skb) |
| 433 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 434 | return (struct rtable *)skb_dst(skb); |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 435 | } |
| 436 | |
Jörn Engel | 231d06a | 2006-03-20 21:28:35 -0800 | [diff] [blame] | 437 | extern void kfree_skb(struct sk_buff *skb); |
Neil Horman | ead2ceb | 2009-03-11 09:49:55 +0000 | [diff] [blame] | 438 | extern void consume_skb(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | extern void __kfree_skb(struct sk_buff *skb); |
David S. Miller | d179cd1 | 2005-08-17 14:57:30 -0700 | [diff] [blame] | 440 | extern struct sk_buff *__alloc_skb(unsigned int size, |
Christoph Hellwig | b30973f | 2006-12-06 20:32:36 -0800 | [diff] [blame] | 441 | gfp_t priority, int fclone, int node); |
David S. Miller | d179cd1 | 2005-08-17 14:57:30 -0700 | [diff] [blame] | 442 | static inline struct sk_buff *alloc_skb(unsigned int size, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 443 | gfp_t priority) |
David S. Miller | d179cd1 | 2005-08-17 14:57:30 -0700 | [diff] [blame] | 444 | { |
Christoph Hellwig | b30973f | 2006-12-06 20:32:36 -0800 | [diff] [blame] | 445 | return __alloc_skb(size, priority, 0, -1); |
David S. Miller | d179cd1 | 2005-08-17 14:57:30 -0700 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | static inline struct sk_buff *alloc_skb_fclone(unsigned int size, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 449 | gfp_t priority) |
David S. Miller | d179cd1 | 2005-08-17 14:57:30 -0700 | [diff] [blame] | 450 | { |
Christoph Hellwig | b30973f | 2006-12-06 20:32:36 -0800 | [diff] [blame] | 451 | return __alloc_skb(size, priority, 1, -1); |
David S. Miller | d179cd1 | 2005-08-17 14:57:30 -0700 | [diff] [blame] | 452 | } |
| 453 | |
Lennert Buytenhek | 04a4bb5 | 2008-10-01 02:33:12 -0700 | [diff] [blame] | 454 | extern int skb_recycle_check(struct sk_buff *skb, int skb_size); |
| 455 | |
Herbert Xu | e0053ec | 2007-10-14 00:37:52 -0700 | [diff] [blame] | 456 | extern struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src); |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 457 | extern struct sk_buff *skb_clone(struct sk_buff *skb, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 458 | gfp_t priority); |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 459 | extern struct sk_buff *skb_copy(const struct sk_buff *skb, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 460 | gfp_t priority); |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 461 | extern struct sk_buff *pskb_copy(struct sk_buff *skb, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 462 | gfp_t gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | extern int pskb_expand_head(struct sk_buff *skb, |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 464 | int nhead, int ntail, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 465 | gfp_t gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | extern struct sk_buff *skb_realloc_headroom(struct sk_buff *skb, |
| 467 | unsigned int headroom); |
| 468 | extern struct sk_buff *skb_copy_expand(const struct sk_buff *skb, |
| 469 | int newheadroom, int newtailroom, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 470 | gfp_t priority); |
David Howells | 716ea3a | 2007-04-02 20:19:53 -0700 | [diff] [blame] | 471 | extern int skb_to_sgvec(struct sk_buff *skb, |
| 472 | struct scatterlist *sg, int offset, |
| 473 | int len); |
| 474 | extern int skb_cow_data(struct sk_buff *skb, int tailbits, |
| 475 | struct sk_buff **trailer); |
Herbert Xu | 5b057c6 | 2006-06-23 02:06:41 -0700 | [diff] [blame] | 476 | extern int skb_pad(struct sk_buff *skb, int pad); |
Neil Horman | ead2ceb | 2009-03-11 09:49:55 +0000 | [diff] [blame] | 477 | #define dev_kfree_skb(a) consume_skb(a) |
| 478 | #define dev_consume_skb(a) kfree_skb_clean(a) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | extern void skb_over_panic(struct sk_buff *skb, int len, |
| 480 | void *here); |
| 481 | extern void skb_under_panic(struct sk_buff *skb, int len, |
| 482 | void *here); |
| 483 | |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 484 | extern int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb, |
| 485 | int getfrag(void *from, char *to, int offset, |
| 486 | int len,int odd, struct sk_buff *skb), |
| 487 | void *from, int length); |
| 488 | |
Thomas Graf | 677e90e | 2005-06-23 20:59:51 -0700 | [diff] [blame] | 489 | struct skb_seq_state |
| 490 | { |
| 491 | __u32 lower_offset; |
| 492 | __u32 upper_offset; |
| 493 | __u32 frag_idx; |
| 494 | __u32 stepped_offset; |
| 495 | struct sk_buff *root_skb; |
| 496 | struct sk_buff *cur_skb; |
| 497 | __u8 *frag_data; |
| 498 | }; |
| 499 | |
| 500 | extern void skb_prepare_seq_read(struct sk_buff *skb, |
| 501 | unsigned int from, unsigned int to, |
| 502 | struct skb_seq_state *st); |
| 503 | extern unsigned int skb_seq_read(unsigned int consumed, const u8 **data, |
| 504 | struct skb_seq_state *st); |
| 505 | extern void skb_abort_seq_read(struct skb_seq_state *st); |
| 506 | |
Thomas Graf | 3fc7e8a | 2005-06-23 21:00:17 -0700 | [diff] [blame] | 507 | extern unsigned int skb_find_text(struct sk_buff *skb, unsigned int from, |
| 508 | unsigned int to, struct ts_config *config, |
| 509 | struct ts_state *state); |
| 510 | |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 511 | #ifdef NET_SKBUFF_DATA_USES_OFFSET |
| 512 | static inline unsigned char *skb_end_pointer(const struct sk_buff *skb) |
| 513 | { |
| 514 | return skb->head + skb->end; |
| 515 | } |
| 516 | #else |
| 517 | static inline unsigned char *skb_end_pointer(const struct sk_buff *skb) |
| 518 | { |
| 519 | return skb->end; |
| 520 | } |
| 521 | #endif |
| 522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | /* Internal */ |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 524 | #define skb_shinfo(SKB) ((struct skb_shared_info *)(skb_end_pointer(SKB))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 526 | static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb) |
| 527 | { |
| 528 | return &skb_shinfo(skb)->hwtstamps; |
| 529 | } |
| 530 | |
| 531 | static inline union skb_shared_tx *skb_tx(struct sk_buff *skb) |
| 532 | { |
| 533 | return &skb_shinfo(skb)->tx_flags; |
| 534 | } |
| 535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | /** |
| 537 | * skb_queue_empty - check if a queue is empty |
| 538 | * @list: queue head |
| 539 | * |
| 540 | * Returns true if the queue is empty, false otherwise. |
| 541 | */ |
| 542 | static inline int skb_queue_empty(const struct sk_buff_head *list) |
| 543 | { |
| 544 | return list->next == (struct sk_buff *)list; |
| 545 | } |
| 546 | |
| 547 | /** |
David S. Miller | fc7ebb2 | 2008-09-23 00:34:07 -0700 | [diff] [blame] | 548 | * skb_queue_is_last - check if skb is the last entry in the queue |
| 549 | * @list: queue head |
| 550 | * @skb: buffer |
| 551 | * |
| 552 | * Returns true if @skb is the last buffer on the list. |
| 553 | */ |
| 554 | static inline bool skb_queue_is_last(const struct sk_buff_head *list, |
| 555 | const struct sk_buff *skb) |
| 556 | { |
| 557 | return (skb->next == (struct sk_buff *) list); |
| 558 | } |
| 559 | |
| 560 | /** |
Ilpo Järvinen | 832d11c | 2008-11-24 21:20:15 -0800 | [diff] [blame] | 561 | * skb_queue_is_first - check if skb is the first entry in the queue |
| 562 | * @list: queue head |
| 563 | * @skb: buffer |
| 564 | * |
| 565 | * Returns true if @skb is the first buffer on the list. |
| 566 | */ |
| 567 | static inline bool skb_queue_is_first(const struct sk_buff_head *list, |
| 568 | const struct sk_buff *skb) |
| 569 | { |
| 570 | return (skb->prev == (struct sk_buff *) list); |
| 571 | } |
| 572 | |
| 573 | /** |
David S. Miller | 249c8b4 | 2008-09-23 00:44:42 -0700 | [diff] [blame] | 574 | * skb_queue_next - return the next packet in the queue |
| 575 | * @list: queue head |
| 576 | * @skb: current buffer |
| 577 | * |
| 578 | * Return the next packet in @list after @skb. It is only valid to |
| 579 | * call this if skb_queue_is_last() evaluates to false. |
| 580 | */ |
| 581 | static inline struct sk_buff *skb_queue_next(const struct sk_buff_head *list, |
| 582 | const struct sk_buff *skb) |
| 583 | { |
| 584 | /* This BUG_ON may seem severe, but if we just return then we |
| 585 | * are going to dereference garbage. |
| 586 | */ |
| 587 | BUG_ON(skb_queue_is_last(list, skb)); |
| 588 | return skb->next; |
| 589 | } |
| 590 | |
| 591 | /** |
Ilpo Järvinen | 832d11c | 2008-11-24 21:20:15 -0800 | [diff] [blame] | 592 | * skb_queue_prev - return the prev packet in the queue |
| 593 | * @list: queue head |
| 594 | * @skb: current buffer |
| 595 | * |
| 596 | * Return the prev packet in @list before @skb. It is only valid to |
| 597 | * call this if skb_queue_is_first() evaluates to false. |
| 598 | */ |
| 599 | static inline struct sk_buff *skb_queue_prev(const struct sk_buff_head *list, |
| 600 | const struct sk_buff *skb) |
| 601 | { |
| 602 | /* This BUG_ON may seem severe, but if we just return then we |
| 603 | * are going to dereference garbage. |
| 604 | */ |
| 605 | BUG_ON(skb_queue_is_first(list, skb)); |
| 606 | return skb->prev; |
| 607 | } |
| 608 | |
| 609 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | * skb_get - reference buffer |
| 611 | * @skb: buffer to reference |
| 612 | * |
| 613 | * Makes another reference to a socket buffer and returns a pointer |
| 614 | * to the buffer. |
| 615 | */ |
| 616 | static inline struct sk_buff *skb_get(struct sk_buff *skb) |
| 617 | { |
| 618 | atomic_inc(&skb->users); |
| 619 | return skb; |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * If users == 1, we are the only owner and are can avoid redundant |
| 624 | * atomic change. |
| 625 | */ |
| 626 | |
| 627 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | * skb_cloned - is the buffer a clone |
| 629 | * @skb: buffer to check |
| 630 | * |
| 631 | * Returns true if the buffer was generated with skb_clone() and is |
| 632 | * one of multiple shared copies of the buffer. Cloned buffers are |
| 633 | * shared data so must not be written to under normal circumstances. |
| 634 | */ |
| 635 | static inline int skb_cloned(const struct sk_buff *skb) |
| 636 | { |
| 637 | return skb->cloned && |
| 638 | (atomic_read(&skb_shinfo(skb)->dataref) & SKB_DATAREF_MASK) != 1; |
| 639 | } |
| 640 | |
| 641 | /** |
| 642 | * skb_header_cloned - is the header a clone |
| 643 | * @skb: buffer to check |
| 644 | * |
| 645 | * Returns true if modifying the header part of the buffer requires |
| 646 | * the data to be copied. |
| 647 | */ |
| 648 | static inline int skb_header_cloned(const struct sk_buff *skb) |
| 649 | { |
| 650 | int dataref; |
| 651 | |
| 652 | if (!skb->cloned) |
| 653 | return 0; |
| 654 | |
| 655 | dataref = atomic_read(&skb_shinfo(skb)->dataref); |
| 656 | dataref = (dataref & SKB_DATAREF_MASK) - (dataref >> SKB_DATAREF_SHIFT); |
| 657 | return dataref != 1; |
| 658 | } |
| 659 | |
| 660 | /** |
| 661 | * skb_header_release - release reference to header |
| 662 | * @skb: buffer to operate on |
| 663 | * |
| 664 | * Drop a reference to the header part of the buffer. This is done |
| 665 | * by acquiring a payload reference. You must not read from the header |
| 666 | * part of skb->data after this. |
| 667 | */ |
| 668 | static inline void skb_header_release(struct sk_buff *skb) |
| 669 | { |
| 670 | BUG_ON(skb->nohdr); |
| 671 | skb->nohdr = 1; |
| 672 | atomic_add(1 << SKB_DATAREF_SHIFT, &skb_shinfo(skb)->dataref); |
| 673 | } |
| 674 | |
| 675 | /** |
| 676 | * skb_shared - is the buffer shared |
| 677 | * @skb: buffer to check |
| 678 | * |
| 679 | * Returns true if more than one person has a reference to this |
| 680 | * buffer. |
| 681 | */ |
| 682 | static inline int skb_shared(const struct sk_buff *skb) |
| 683 | { |
| 684 | return atomic_read(&skb->users) != 1; |
| 685 | } |
| 686 | |
| 687 | /** |
| 688 | * skb_share_check - check if buffer is shared and if so clone it |
| 689 | * @skb: buffer to check |
| 690 | * @pri: priority for memory allocation |
| 691 | * |
| 692 | * If the buffer is shared the buffer is cloned and the old copy |
| 693 | * drops a reference. A new clone with a single reference is returned. |
| 694 | * If the buffer is not shared the original buffer is returned. When |
| 695 | * being called from interrupt status or with spinlocks held pri must |
| 696 | * be GFP_ATOMIC. |
| 697 | * |
| 698 | * NULL is returned on a memory allocation failure. |
| 699 | */ |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 700 | static inline struct sk_buff *skb_share_check(struct sk_buff *skb, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 701 | gfp_t pri) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
| 703 | might_sleep_if(pri & __GFP_WAIT); |
| 704 | if (skb_shared(skb)) { |
| 705 | struct sk_buff *nskb = skb_clone(skb, pri); |
| 706 | kfree_skb(skb); |
| 707 | skb = nskb; |
| 708 | } |
| 709 | return skb; |
| 710 | } |
| 711 | |
| 712 | /* |
| 713 | * Copy shared buffers into a new sk_buff. We effectively do COW on |
| 714 | * packets to handle cases where we have a local reader and forward |
| 715 | * and a couple of other messy ones. The normal one is tcpdumping |
| 716 | * a packet thats being forwarded. |
| 717 | */ |
| 718 | |
| 719 | /** |
| 720 | * skb_unshare - make a copy of a shared buffer |
| 721 | * @skb: buffer to check |
| 722 | * @pri: priority for memory allocation |
| 723 | * |
| 724 | * If the socket buffer is a clone then this function creates a new |
| 725 | * copy of the data, drops a reference count on the old copy and returns |
| 726 | * the new copy with the reference count at 1. If the buffer is not a clone |
| 727 | * the original buffer is returned. When called with a spinlock held or |
| 728 | * from interrupt state @pri must be %GFP_ATOMIC |
| 729 | * |
| 730 | * %NULL is returned on a memory allocation failure. |
| 731 | */ |
Victor Fusco | e2bf521 | 2005-07-18 13:36:38 -0700 | [diff] [blame] | 732 | static inline struct sk_buff *skb_unshare(struct sk_buff *skb, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 733 | gfp_t pri) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | { |
| 735 | might_sleep_if(pri & __GFP_WAIT); |
| 736 | if (skb_cloned(skb)) { |
| 737 | struct sk_buff *nskb = skb_copy(skb, pri); |
| 738 | kfree_skb(skb); /* Free our shared copy */ |
| 739 | skb = nskb; |
| 740 | } |
| 741 | return skb; |
| 742 | } |
| 743 | |
| 744 | /** |
| 745 | * skb_peek |
| 746 | * @list_: list to peek at |
| 747 | * |
| 748 | * Peek an &sk_buff. Unlike most other operations you _MUST_ |
| 749 | * be careful with this one. A peek leaves the buffer on the |
| 750 | * list and someone else may run off with it. You must hold |
| 751 | * the appropriate locks or have a private queue to do this. |
| 752 | * |
| 753 | * Returns %NULL for an empty list or a pointer to the head element. |
| 754 | * The reference count is not incremented and the reference is therefore |
| 755 | * volatile. Use with caution. |
| 756 | */ |
| 757 | static inline struct sk_buff *skb_peek(struct sk_buff_head *list_) |
| 758 | { |
| 759 | struct sk_buff *list = ((struct sk_buff *)list_)->next; |
| 760 | if (list == (struct sk_buff *)list_) |
| 761 | list = NULL; |
| 762 | return list; |
| 763 | } |
| 764 | |
| 765 | /** |
| 766 | * skb_peek_tail |
| 767 | * @list_: list to peek at |
| 768 | * |
| 769 | * Peek an &sk_buff. Unlike most other operations you _MUST_ |
| 770 | * be careful with this one. A peek leaves the buffer on the |
| 771 | * list and someone else may run off with it. You must hold |
| 772 | * the appropriate locks or have a private queue to do this. |
| 773 | * |
| 774 | * Returns %NULL for an empty list or a pointer to the tail element. |
| 775 | * The reference count is not incremented and the reference is therefore |
| 776 | * volatile. Use with caution. |
| 777 | */ |
| 778 | static inline struct sk_buff *skb_peek_tail(struct sk_buff_head *list_) |
| 779 | { |
| 780 | struct sk_buff *list = ((struct sk_buff *)list_)->prev; |
| 781 | if (list == (struct sk_buff *)list_) |
| 782 | list = NULL; |
| 783 | return list; |
| 784 | } |
| 785 | |
| 786 | /** |
| 787 | * skb_queue_len - get queue length |
| 788 | * @list_: list to measure |
| 789 | * |
| 790 | * Return the length of an &sk_buff queue. |
| 791 | */ |
| 792 | static inline __u32 skb_queue_len(const struct sk_buff_head *list_) |
| 793 | { |
| 794 | return list_->qlen; |
| 795 | } |
| 796 | |
David S. Miller | 67fed45 | 2008-09-21 22:36:24 -0700 | [diff] [blame] | 797 | /** |
| 798 | * __skb_queue_head_init - initialize non-spinlock portions of sk_buff_head |
| 799 | * @list: queue to initialize |
| 800 | * |
| 801 | * This initializes only the list and queue length aspects of |
| 802 | * an sk_buff_head object. This allows to initialize the list |
| 803 | * aspects of an sk_buff_head without reinitializing things like |
| 804 | * the spinlock. It can also be used for on-stack sk_buff_head |
| 805 | * objects where the spinlock is known to not be used. |
| 806 | */ |
| 807 | static inline void __skb_queue_head_init(struct sk_buff_head *list) |
| 808 | { |
| 809 | list->prev = list->next = (struct sk_buff *)list; |
| 810 | list->qlen = 0; |
| 811 | } |
| 812 | |
Arjan van de Ven | 76f10ad | 2006-08-02 14:06:55 -0700 | [diff] [blame] | 813 | /* |
| 814 | * This function creates a split out lock class for each invocation; |
| 815 | * this is needed for now since a whole lot of users of the skb-queue |
| 816 | * infrastructure in drivers have different locking usage (in hardirq) |
| 817 | * than the networking core (in softirq only). In the long run either the |
| 818 | * network layer or drivers should need annotation to consolidate the |
| 819 | * main types of usage into 3 classes. |
| 820 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | static inline void skb_queue_head_init(struct sk_buff_head *list) |
| 822 | { |
| 823 | spin_lock_init(&list->lock); |
David S. Miller | 67fed45 | 2008-09-21 22:36:24 -0700 | [diff] [blame] | 824 | __skb_queue_head_init(list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |
| 826 | |
Pavel Emelianov | c2ecba7 | 2007-04-17 12:45:31 -0700 | [diff] [blame] | 827 | static inline void skb_queue_head_init_class(struct sk_buff_head *list, |
| 828 | struct lock_class_key *class) |
| 829 | { |
| 830 | skb_queue_head_init(list); |
| 831 | lockdep_set_class(&list->lock, class); |
| 832 | } |
| 833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | /* |
Gerrit Renker | bf29927 | 2008-04-14 00:04:51 -0700 | [diff] [blame] | 835 | * Insert an sk_buff on a list. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | * |
| 837 | * The "__skb_xxxx()" functions are the non-atomic ones that |
| 838 | * can only be called with interrupts disabled. |
| 839 | */ |
Gerrit Renker | bf29927 | 2008-04-14 00:04:51 -0700 | [diff] [blame] | 840 | extern void skb_insert(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head *list); |
| 841 | static inline void __skb_insert(struct sk_buff *newsk, |
| 842 | struct sk_buff *prev, struct sk_buff *next, |
| 843 | struct sk_buff_head *list) |
| 844 | { |
| 845 | newsk->next = next; |
| 846 | newsk->prev = prev; |
| 847 | next->prev = prev->next = newsk; |
| 848 | list->qlen++; |
| 849 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | |
David S. Miller | 67fed45 | 2008-09-21 22:36:24 -0700 | [diff] [blame] | 851 | static inline void __skb_queue_splice(const struct sk_buff_head *list, |
| 852 | struct sk_buff *prev, |
| 853 | struct sk_buff *next) |
| 854 | { |
| 855 | struct sk_buff *first = list->next; |
| 856 | struct sk_buff *last = list->prev; |
| 857 | |
| 858 | first->prev = prev; |
| 859 | prev->next = first; |
| 860 | |
| 861 | last->next = next; |
| 862 | next->prev = last; |
| 863 | } |
| 864 | |
| 865 | /** |
| 866 | * skb_queue_splice - join two skb lists, this is designed for stacks |
| 867 | * @list: the new list to add |
| 868 | * @head: the place to add it in the first list |
| 869 | */ |
| 870 | static inline void skb_queue_splice(const struct sk_buff_head *list, |
| 871 | struct sk_buff_head *head) |
| 872 | { |
| 873 | if (!skb_queue_empty(list)) { |
| 874 | __skb_queue_splice(list, (struct sk_buff *) head, head->next); |
David S. Miller | 1d4a31d | 2008-09-22 21:57:21 -0700 | [diff] [blame] | 875 | head->qlen += list->qlen; |
David S. Miller | 67fed45 | 2008-09-21 22:36:24 -0700 | [diff] [blame] | 876 | } |
| 877 | } |
| 878 | |
| 879 | /** |
| 880 | * skb_queue_splice - join two skb lists and reinitialise the emptied list |
| 881 | * @list: the new list to add |
| 882 | * @head: the place to add it in the first list |
| 883 | * |
| 884 | * The list at @list is reinitialised |
| 885 | */ |
| 886 | static inline void skb_queue_splice_init(struct sk_buff_head *list, |
| 887 | struct sk_buff_head *head) |
| 888 | { |
| 889 | if (!skb_queue_empty(list)) { |
| 890 | __skb_queue_splice(list, (struct sk_buff *) head, head->next); |
David S. Miller | 1d4a31d | 2008-09-22 21:57:21 -0700 | [diff] [blame] | 891 | head->qlen += list->qlen; |
David S. Miller | 67fed45 | 2008-09-21 22:36:24 -0700 | [diff] [blame] | 892 | __skb_queue_head_init(list); |
| 893 | } |
| 894 | } |
| 895 | |
| 896 | /** |
| 897 | * skb_queue_splice_tail - join two skb lists, each list being a queue |
| 898 | * @list: the new list to add |
| 899 | * @head: the place to add it in the first list |
| 900 | */ |
| 901 | static inline void skb_queue_splice_tail(const struct sk_buff_head *list, |
| 902 | struct sk_buff_head *head) |
| 903 | { |
| 904 | if (!skb_queue_empty(list)) { |
| 905 | __skb_queue_splice(list, head->prev, (struct sk_buff *) head); |
David S. Miller | 1d4a31d | 2008-09-22 21:57:21 -0700 | [diff] [blame] | 906 | head->qlen += list->qlen; |
David S. Miller | 67fed45 | 2008-09-21 22:36:24 -0700 | [diff] [blame] | 907 | } |
| 908 | } |
| 909 | |
| 910 | /** |
| 911 | * skb_queue_splice_tail - join two skb lists and reinitialise the emptied list |
| 912 | * @list: the new list to add |
| 913 | * @head: the place to add it in the first list |
| 914 | * |
| 915 | * Each of the lists is a queue. |
| 916 | * The list at @list is reinitialised |
| 917 | */ |
| 918 | static inline void skb_queue_splice_tail_init(struct sk_buff_head *list, |
| 919 | struct sk_buff_head *head) |
| 920 | { |
| 921 | if (!skb_queue_empty(list)) { |
| 922 | __skb_queue_splice(list, head->prev, (struct sk_buff *) head); |
David S. Miller | 1d4a31d | 2008-09-22 21:57:21 -0700 | [diff] [blame] | 923 | head->qlen += list->qlen; |
David S. Miller | 67fed45 | 2008-09-21 22:36:24 -0700 | [diff] [blame] | 924 | __skb_queue_head_init(list); |
| 925 | } |
| 926 | } |
| 927 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | /** |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 929 | * __skb_queue_after - queue a buffer at the list head |
| 930 | * @list: list to use |
| 931 | * @prev: place after this buffer |
| 932 | * @newsk: buffer to queue |
| 933 | * |
| 934 | * Queue a buffer int the middle of a list. This function takes no locks |
| 935 | * and you must therefore hold required locks before calling it. |
| 936 | * |
| 937 | * A buffer cannot be placed on two lists at the same time. |
| 938 | */ |
| 939 | static inline void __skb_queue_after(struct sk_buff_head *list, |
| 940 | struct sk_buff *prev, |
| 941 | struct sk_buff *newsk) |
| 942 | { |
Gerrit Renker | bf29927 | 2008-04-14 00:04:51 -0700 | [diff] [blame] | 943 | __skb_insert(newsk, prev, prev->next, list); |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 944 | } |
| 945 | |
Gerrit Renker | 7de6c03 | 2008-04-14 00:05:09 -0700 | [diff] [blame] | 946 | extern void skb_append(struct sk_buff *old, struct sk_buff *newsk, |
| 947 | struct sk_buff_head *list); |
| 948 | |
Gerrit Renker | f557285 | 2008-04-14 00:05:28 -0700 | [diff] [blame] | 949 | static inline void __skb_queue_before(struct sk_buff_head *list, |
| 950 | struct sk_buff *next, |
| 951 | struct sk_buff *newsk) |
| 952 | { |
| 953 | __skb_insert(newsk, next->prev, next, list); |
| 954 | } |
| 955 | |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 956 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | * __skb_queue_head - queue a buffer at the list head |
| 958 | * @list: list to use |
| 959 | * @newsk: buffer to queue |
| 960 | * |
| 961 | * Queue a buffer at the start of a list. This function takes no locks |
| 962 | * and you must therefore hold required locks before calling it. |
| 963 | * |
| 964 | * A buffer cannot be placed on two lists at the same time. |
| 965 | */ |
| 966 | extern void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk); |
| 967 | static inline void __skb_queue_head(struct sk_buff_head *list, |
| 968 | struct sk_buff *newsk) |
| 969 | { |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 970 | __skb_queue_after(list, (struct sk_buff *)list, newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | } |
| 972 | |
| 973 | /** |
| 974 | * __skb_queue_tail - queue a buffer at the list tail |
| 975 | * @list: list to use |
| 976 | * @newsk: buffer to queue |
| 977 | * |
| 978 | * Queue a buffer at the end of a list. This function takes no locks |
| 979 | * and you must therefore hold required locks before calling it. |
| 980 | * |
| 981 | * A buffer cannot be placed on two lists at the same time. |
| 982 | */ |
| 983 | extern void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk); |
| 984 | static inline void __skb_queue_tail(struct sk_buff_head *list, |
| 985 | struct sk_buff *newsk) |
| 986 | { |
Gerrit Renker | f557285 | 2008-04-14 00:05:28 -0700 | [diff] [blame] | 987 | __skb_queue_before(list, (struct sk_buff *)list, newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | } |
| 989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | * remove sk_buff from list. _Must_ be called atomically, and with |
| 992 | * the list known.. |
| 993 | */ |
David S. Miller | 8728b83 | 2005-08-09 19:25:21 -0700 | [diff] [blame] | 994 | extern void skb_unlink(struct sk_buff *skb, struct sk_buff_head *list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | static inline void __skb_unlink(struct sk_buff *skb, struct sk_buff_head *list) |
| 996 | { |
| 997 | struct sk_buff *next, *prev; |
| 998 | |
| 999 | list->qlen--; |
| 1000 | next = skb->next; |
| 1001 | prev = skb->prev; |
| 1002 | skb->next = skb->prev = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | next->prev = prev; |
| 1004 | prev->next = next; |
| 1005 | } |
| 1006 | |
Gerrit Renker | f525c06 | 2008-04-14 00:04:12 -0700 | [diff] [blame] | 1007 | /** |
| 1008 | * __skb_dequeue - remove from the head of the queue |
| 1009 | * @list: list to dequeue from |
| 1010 | * |
| 1011 | * Remove the head of the list. This function does not take any locks |
| 1012 | * so must be used with appropriate locks held only. The head item is |
| 1013 | * returned or %NULL if the list is empty. |
| 1014 | */ |
| 1015 | extern struct sk_buff *skb_dequeue(struct sk_buff_head *list); |
| 1016 | static inline struct sk_buff *__skb_dequeue(struct sk_buff_head *list) |
| 1017 | { |
| 1018 | struct sk_buff *skb = skb_peek(list); |
| 1019 | if (skb) |
| 1020 | __skb_unlink(skb, list); |
| 1021 | return skb; |
| 1022 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | |
| 1024 | /** |
| 1025 | * __skb_dequeue_tail - remove from the tail of the queue |
| 1026 | * @list: list to dequeue from |
| 1027 | * |
| 1028 | * Remove the tail of the list. This function does not take any locks |
| 1029 | * so must be used with appropriate locks held only. The tail item is |
| 1030 | * returned or %NULL if the list is empty. |
| 1031 | */ |
| 1032 | extern struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list); |
| 1033 | static inline struct sk_buff *__skb_dequeue_tail(struct sk_buff_head *list) |
| 1034 | { |
| 1035 | struct sk_buff *skb = skb_peek_tail(list); |
| 1036 | if (skb) |
| 1037 | __skb_unlink(skb, list); |
| 1038 | return skb; |
| 1039 | } |
| 1040 | |
| 1041 | |
| 1042 | static inline int skb_is_nonlinear(const struct sk_buff *skb) |
| 1043 | { |
| 1044 | return skb->data_len; |
| 1045 | } |
| 1046 | |
| 1047 | static inline unsigned int skb_headlen(const struct sk_buff *skb) |
| 1048 | { |
| 1049 | return skb->len - skb->data_len; |
| 1050 | } |
| 1051 | |
| 1052 | static inline int skb_pagelen(const struct sk_buff *skb) |
| 1053 | { |
| 1054 | int i, len = 0; |
| 1055 | |
| 1056 | for (i = (int)skb_shinfo(skb)->nr_frags - 1; i >= 0; i--) |
| 1057 | len += skb_shinfo(skb)->frags[i].size; |
| 1058 | return len + skb_headlen(skb); |
| 1059 | } |
| 1060 | |
| 1061 | static inline void skb_fill_page_desc(struct sk_buff *skb, int i, |
| 1062 | struct page *page, int off, int size) |
| 1063 | { |
| 1064 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
| 1065 | |
| 1066 | frag->page = page; |
| 1067 | frag->page_offset = off; |
| 1068 | frag->size = size; |
| 1069 | skb_shinfo(skb)->nr_frags = i + 1; |
| 1070 | } |
| 1071 | |
Peter Zijlstra | 654bed1 | 2008-10-07 14:22:33 -0700 | [diff] [blame] | 1072 | extern void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, |
| 1073 | int off, int size); |
| 1074 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | #define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags) |
David S. Miller | ee03987 | 2009-06-09 00:17:13 -0700 | [diff] [blame] | 1076 | #define SKB_FRAG_ASSERT(skb) BUG_ON(skb_has_frags(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | #define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb)) |
| 1078 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1079 | #ifdef NET_SKBUFF_DATA_USES_OFFSET |
| 1080 | static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb) |
| 1081 | { |
| 1082 | return skb->head + skb->tail; |
| 1083 | } |
| 1084 | |
| 1085 | static inline void skb_reset_tail_pointer(struct sk_buff *skb) |
| 1086 | { |
| 1087 | skb->tail = skb->data - skb->head; |
| 1088 | } |
| 1089 | |
| 1090 | static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset) |
| 1091 | { |
| 1092 | skb_reset_tail_pointer(skb); |
| 1093 | skb->tail += offset; |
| 1094 | } |
| 1095 | #else /* NET_SKBUFF_DATA_USES_OFFSET */ |
| 1096 | static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb) |
| 1097 | { |
| 1098 | return skb->tail; |
| 1099 | } |
| 1100 | |
| 1101 | static inline void skb_reset_tail_pointer(struct sk_buff *skb) |
| 1102 | { |
| 1103 | skb->tail = skb->data; |
| 1104 | } |
| 1105 | |
| 1106 | static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset) |
| 1107 | { |
| 1108 | skb->tail = skb->data + offset; |
| 1109 | } |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 1110 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1111 | #endif /* NET_SKBUFF_DATA_USES_OFFSET */ |
| 1112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | /* |
| 1114 | * Add data to an sk_buff |
| 1115 | */ |
Ilpo Järvinen | 0dde3e1 | 2008-03-27 17:43:41 -0700 | [diff] [blame] | 1116 | extern unsigned char *skb_put(struct sk_buff *skb, unsigned int len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | static inline unsigned char *__skb_put(struct sk_buff *skb, unsigned int len) |
| 1118 | { |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1119 | unsigned char *tmp = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | SKB_LINEAR_ASSERT(skb); |
| 1121 | skb->tail += len; |
| 1122 | skb->len += len; |
| 1123 | return tmp; |
| 1124 | } |
| 1125 | |
Ilpo Järvinen | c2aa270 | 2008-03-27 17:52:40 -0700 | [diff] [blame] | 1126 | extern unsigned char *skb_push(struct sk_buff *skb, unsigned int len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | static inline unsigned char *__skb_push(struct sk_buff *skb, unsigned int len) |
| 1128 | { |
| 1129 | skb->data -= len; |
| 1130 | skb->len += len; |
| 1131 | return skb->data; |
| 1132 | } |
| 1133 | |
Ilpo Järvinen | 6be8ac2 | 2008-03-27 17:47:24 -0700 | [diff] [blame] | 1134 | extern unsigned char *skb_pull(struct sk_buff *skb, unsigned int len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | static inline unsigned char *__skb_pull(struct sk_buff *skb, unsigned int len) |
| 1136 | { |
| 1137 | skb->len -= len; |
| 1138 | BUG_ON(skb->len < skb->data_len); |
| 1139 | return skb->data += len; |
| 1140 | } |
| 1141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | extern unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta); |
| 1143 | |
| 1144 | static inline unsigned char *__pskb_pull(struct sk_buff *skb, unsigned int len) |
| 1145 | { |
| 1146 | if (len > skb_headlen(skb) && |
Gerrit Renker | 987c402 | 2008-08-11 18:17:17 -0700 | [diff] [blame] | 1147 | !__pskb_pull_tail(skb, len - skb_headlen(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | return NULL; |
| 1149 | skb->len -= len; |
| 1150 | return skb->data += len; |
| 1151 | } |
| 1152 | |
| 1153 | static inline unsigned char *pskb_pull(struct sk_buff *skb, unsigned int len) |
| 1154 | { |
| 1155 | return unlikely(len > skb->len) ? NULL : __pskb_pull(skb, len); |
| 1156 | } |
| 1157 | |
| 1158 | static inline int pskb_may_pull(struct sk_buff *skb, unsigned int len) |
| 1159 | { |
| 1160 | if (likely(len <= skb_headlen(skb))) |
| 1161 | return 1; |
| 1162 | if (unlikely(len > skb->len)) |
| 1163 | return 0; |
Gerrit Renker | 987c402 | 2008-08-11 18:17:17 -0700 | [diff] [blame] | 1164 | return __pskb_pull_tail(skb, len - skb_headlen(skb)) != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | } |
| 1166 | |
| 1167 | /** |
| 1168 | * skb_headroom - bytes at buffer head |
| 1169 | * @skb: buffer to check |
| 1170 | * |
| 1171 | * Return the number of bytes of free space at the head of an &sk_buff. |
| 1172 | */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 1173 | static inline unsigned int skb_headroom(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | { |
| 1175 | return skb->data - skb->head; |
| 1176 | } |
| 1177 | |
| 1178 | /** |
| 1179 | * skb_tailroom - bytes at buffer end |
| 1180 | * @skb: buffer to check |
| 1181 | * |
| 1182 | * Return the number of bytes of free space at the tail of an sk_buff |
| 1183 | */ |
| 1184 | static inline int skb_tailroom(const struct sk_buff *skb) |
| 1185 | { |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 1186 | return skb_is_nonlinear(skb) ? 0 : skb->end - skb->tail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | } |
| 1188 | |
| 1189 | /** |
| 1190 | * skb_reserve - adjust headroom |
| 1191 | * @skb: buffer to alter |
| 1192 | * @len: bytes to move |
| 1193 | * |
| 1194 | * Increase the headroom of an empty &sk_buff by reducing the tail |
| 1195 | * room. This is only allowed for an empty buffer. |
| 1196 | */ |
David S. Miller | 8243126 | 2006-01-17 02:54:21 -0800 | [diff] [blame] | 1197 | static inline void skb_reserve(struct sk_buff *skb, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | { |
| 1199 | skb->data += len; |
| 1200 | skb->tail += len; |
| 1201 | } |
| 1202 | |
Arnaldo Carvalho de Melo | 2e07fa9 | 2007-04-10 21:22:35 -0700 | [diff] [blame] | 1203 | #ifdef NET_SKBUFF_DATA_USES_OFFSET |
| 1204 | static inline unsigned char *skb_transport_header(const struct sk_buff *skb) |
| 1205 | { |
| 1206 | return skb->head + skb->transport_header; |
| 1207 | } |
| 1208 | |
| 1209 | static inline void skb_reset_transport_header(struct sk_buff *skb) |
| 1210 | { |
| 1211 | skb->transport_header = skb->data - skb->head; |
| 1212 | } |
| 1213 | |
| 1214 | static inline void skb_set_transport_header(struct sk_buff *skb, |
| 1215 | const int offset) |
| 1216 | { |
| 1217 | skb_reset_transport_header(skb); |
| 1218 | skb->transport_header += offset; |
| 1219 | } |
| 1220 | |
| 1221 | static inline unsigned char *skb_network_header(const struct sk_buff *skb) |
| 1222 | { |
| 1223 | return skb->head + skb->network_header; |
| 1224 | } |
| 1225 | |
| 1226 | static inline void skb_reset_network_header(struct sk_buff *skb) |
| 1227 | { |
| 1228 | skb->network_header = skb->data - skb->head; |
| 1229 | } |
| 1230 | |
| 1231 | static inline void skb_set_network_header(struct sk_buff *skb, const int offset) |
| 1232 | { |
| 1233 | skb_reset_network_header(skb); |
| 1234 | skb->network_header += offset; |
| 1235 | } |
| 1236 | |
| 1237 | static inline unsigned char *skb_mac_header(const struct sk_buff *skb) |
| 1238 | { |
| 1239 | return skb->head + skb->mac_header; |
| 1240 | } |
| 1241 | |
| 1242 | static inline int skb_mac_header_was_set(const struct sk_buff *skb) |
| 1243 | { |
| 1244 | return skb->mac_header != ~0U; |
| 1245 | } |
| 1246 | |
| 1247 | static inline void skb_reset_mac_header(struct sk_buff *skb) |
| 1248 | { |
| 1249 | skb->mac_header = skb->data - skb->head; |
| 1250 | } |
| 1251 | |
| 1252 | static inline void skb_set_mac_header(struct sk_buff *skb, const int offset) |
| 1253 | { |
| 1254 | skb_reset_mac_header(skb); |
| 1255 | skb->mac_header += offset; |
| 1256 | } |
| 1257 | |
| 1258 | #else /* NET_SKBUFF_DATA_USES_OFFSET */ |
| 1259 | |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1260 | static inline unsigned char *skb_transport_header(const struct sk_buff *skb) |
| 1261 | { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1262 | return skb->transport_header; |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 1263 | } |
| 1264 | |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 1265 | static inline void skb_reset_transport_header(struct sk_buff *skb) |
| 1266 | { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1267 | skb->transport_header = skb->data; |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 1268 | } |
| 1269 | |
Arnaldo Carvalho de Melo | 967b05f | 2007-03-13 13:51:52 -0300 | [diff] [blame] | 1270 | static inline void skb_set_transport_header(struct sk_buff *skb, |
| 1271 | const int offset) |
| 1272 | { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1273 | skb->transport_header = skb->data + offset; |
Arnaldo Carvalho de Melo | 967b05f | 2007-03-13 13:51:52 -0300 | [diff] [blame] | 1274 | } |
| 1275 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1276 | static inline unsigned char *skb_network_header(const struct sk_buff *skb) |
| 1277 | { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1278 | return skb->network_header; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1279 | } |
| 1280 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1281 | static inline void skb_reset_network_header(struct sk_buff *skb) |
| 1282 | { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1283 | skb->network_header = skb->data; |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1284 | } |
| 1285 | |
Arnaldo Carvalho de Melo | c14d245 | 2007-03-11 22:39:41 -0300 | [diff] [blame] | 1286 | static inline void skb_set_network_header(struct sk_buff *skb, const int offset) |
| 1287 | { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1288 | skb->network_header = skb->data + offset; |
Arnaldo Carvalho de Melo | c14d245 | 2007-03-11 22:39:41 -0300 | [diff] [blame] | 1289 | } |
| 1290 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1291 | static inline unsigned char *skb_mac_header(const struct sk_buff *skb) |
| 1292 | { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1293 | return skb->mac_header; |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1294 | } |
| 1295 | |
| 1296 | static inline int skb_mac_header_was_set(const struct sk_buff *skb) |
| 1297 | { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1298 | return skb->mac_header != NULL; |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 1299 | } |
| 1300 | |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1301 | static inline void skb_reset_mac_header(struct sk_buff *skb) |
| 1302 | { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1303 | skb->mac_header = skb->data; |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 1304 | } |
| 1305 | |
Arnaldo Carvalho de Melo | 48d49d0c | 2007-03-10 12:30:58 -0300 | [diff] [blame] | 1306 | static inline void skb_set_mac_header(struct sk_buff *skb, const int offset) |
| 1307 | { |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1308 | skb->mac_header = skb->data + offset; |
Arnaldo Carvalho de Melo | 48d49d0c | 2007-03-10 12:30:58 -0300 | [diff] [blame] | 1309 | } |
Arnaldo Carvalho de Melo | 2e07fa9 | 2007-04-10 21:22:35 -0700 | [diff] [blame] | 1310 | #endif /* NET_SKBUFF_DATA_USES_OFFSET */ |
| 1311 | |
| 1312 | static inline int skb_transport_offset(const struct sk_buff *skb) |
| 1313 | { |
| 1314 | return skb_transport_header(skb) - skb->data; |
| 1315 | } |
| 1316 | |
| 1317 | static inline u32 skb_network_header_len(const struct sk_buff *skb) |
| 1318 | { |
| 1319 | return skb->transport_header - skb->network_header; |
| 1320 | } |
| 1321 | |
| 1322 | static inline int skb_network_offset(const struct sk_buff *skb) |
| 1323 | { |
| 1324 | return skb_network_header(skb) - skb->data; |
| 1325 | } |
Arnaldo Carvalho de Melo | 48d49d0c | 2007-03-10 12:30:58 -0300 | [diff] [blame] | 1326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | /* |
| 1328 | * CPUs often take a performance hit when accessing unaligned memory |
| 1329 | * locations. The actual performance hit varies, it can be small if the |
| 1330 | * hardware handles it or large if we have to take an exception and fix it |
| 1331 | * in software. |
| 1332 | * |
| 1333 | * Since an ethernet header is 14 bytes network drivers often end up with |
| 1334 | * the IP header at an unaligned offset. The IP header can be aligned by |
| 1335 | * shifting the start of the packet by 2 bytes. Drivers should do this |
| 1336 | * with: |
| 1337 | * |
| 1338 | * skb_reserve(NET_IP_ALIGN); |
| 1339 | * |
| 1340 | * The downside to this alignment of the IP header is that the DMA is now |
| 1341 | * unaligned. On some architectures the cost of an unaligned DMA is high |
| 1342 | * and this cost outweighs the gains made by aligning the IP header. |
| 1343 | * |
| 1344 | * Since this trade off varies between architectures, we allow NET_IP_ALIGN |
| 1345 | * to be overridden. |
| 1346 | */ |
| 1347 | #ifndef NET_IP_ALIGN |
| 1348 | #define NET_IP_ALIGN 2 |
| 1349 | #endif |
| 1350 | |
Anton Blanchard | 025be81 | 2006-03-31 02:27:06 -0800 | [diff] [blame] | 1351 | /* |
| 1352 | * The networking layer reserves some headroom in skb data (via |
| 1353 | * dev_alloc_skb). This is used to avoid having to reallocate skb data when |
| 1354 | * the header has to grow. In the default case, if the header has to grow |
David S. Miller | d6301d3 | 2009-02-08 19:24:13 -0800 | [diff] [blame] | 1355 | * 32 bytes or less we avoid the reallocation. |
Anton Blanchard | 025be81 | 2006-03-31 02:27:06 -0800 | [diff] [blame] | 1356 | * |
| 1357 | * Unfortunately this headroom changes the DMA alignment of the resulting |
| 1358 | * network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive |
| 1359 | * on some architectures. An architecture can override this value, |
| 1360 | * perhaps setting it to a cacheline in size (since that will maintain |
| 1361 | * cacheline alignment of the DMA). It must be a power of 2. |
| 1362 | * |
David S. Miller | d6301d3 | 2009-02-08 19:24:13 -0800 | [diff] [blame] | 1363 | * Various parts of the networking layer expect at least 32 bytes of |
Anton Blanchard | 025be81 | 2006-03-31 02:27:06 -0800 | [diff] [blame] | 1364 | * headroom, you should not reduce this. |
| 1365 | */ |
| 1366 | #ifndef NET_SKB_PAD |
David S. Miller | d6301d3 | 2009-02-08 19:24:13 -0800 | [diff] [blame] | 1367 | #define NET_SKB_PAD 32 |
Anton Blanchard | 025be81 | 2006-03-31 02:27:06 -0800 | [diff] [blame] | 1368 | #endif |
| 1369 | |
Herbert Xu | 3cc0e87 | 2006-06-09 16:13:38 -0700 | [diff] [blame] | 1370 | extern int ___pskb_trim(struct sk_buff *skb, unsigned int len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | |
| 1372 | static inline void __skb_trim(struct sk_buff *skb, unsigned int len) |
| 1373 | { |
Herbert Xu | 3cc0e87 | 2006-06-09 16:13:38 -0700 | [diff] [blame] | 1374 | if (unlikely(skb->data_len)) { |
| 1375 | WARN_ON(1); |
| 1376 | return; |
| 1377 | } |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1378 | skb->len = len; |
| 1379 | skb_set_tail_pointer(skb, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | } |
| 1381 | |
Ilpo Järvinen | 419ae74 | 2008-03-27 17:54:01 -0700 | [diff] [blame] | 1382 | extern void skb_trim(struct sk_buff *skb, unsigned int len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | |
| 1384 | static inline int __pskb_trim(struct sk_buff *skb, unsigned int len) |
| 1385 | { |
Herbert Xu | 3cc0e87 | 2006-06-09 16:13:38 -0700 | [diff] [blame] | 1386 | if (skb->data_len) |
| 1387 | return ___pskb_trim(skb, len); |
| 1388 | __skb_trim(skb, len); |
| 1389 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | } |
| 1391 | |
| 1392 | static inline int pskb_trim(struct sk_buff *skb, unsigned int len) |
| 1393 | { |
| 1394 | return (len < skb->len) ? __pskb_trim(skb, len) : 0; |
| 1395 | } |
| 1396 | |
| 1397 | /** |
Herbert Xu | e9fa4f7 | 2006-08-13 20:12:58 -0700 | [diff] [blame] | 1398 | * pskb_trim_unique - remove end from a paged unique (not cloned) buffer |
| 1399 | * @skb: buffer to alter |
| 1400 | * @len: new length |
| 1401 | * |
| 1402 | * This is identical to pskb_trim except that the caller knows that |
| 1403 | * the skb is not cloned so we should never get an error due to out- |
| 1404 | * of-memory. |
| 1405 | */ |
| 1406 | static inline void pskb_trim_unique(struct sk_buff *skb, unsigned int len) |
| 1407 | { |
| 1408 | int err = pskb_trim(skb, len); |
| 1409 | BUG_ON(err); |
| 1410 | } |
| 1411 | |
| 1412 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | * skb_orphan - orphan a buffer |
| 1414 | * @skb: buffer to orphan |
| 1415 | * |
| 1416 | * If a buffer currently has an owner then we call the owner's |
| 1417 | * destructor function and make the @skb unowned. The buffer continues |
| 1418 | * to exist but is no longer charged to its former owner. |
| 1419 | */ |
| 1420 | static inline void skb_orphan(struct sk_buff *skb) |
| 1421 | { |
| 1422 | if (skb->destructor) |
| 1423 | skb->destructor(skb); |
| 1424 | skb->destructor = NULL; |
| 1425 | skb->sk = NULL; |
| 1426 | } |
| 1427 | |
| 1428 | /** |
| 1429 | * __skb_queue_purge - empty a list |
| 1430 | * @list: list to empty |
| 1431 | * |
| 1432 | * Delete all buffers on an &sk_buff list. Each buffer is removed from |
| 1433 | * the list and one reference dropped. This function does not take the |
| 1434 | * list lock and the caller must hold the relevant locks to use it. |
| 1435 | */ |
| 1436 | extern void skb_queue_purge(struct sk_buff_head *list); |
| 1437 | static inline void __skb_queue_purge(struct sk_buff_head *list) |
| 1438 | { |
| 1439 | struct sk_buff *skb; |
| 1440 | while ((skb = __skb_dequeue(list)) != NULL) |
| 1441 | kfree_skb(skb); |
| 1442 | } |
| 1443 | |
| 1444 | /** |
Christoph Hellwig | b4e54de | 2006-07-24 15:31:14 -0700 | [diff] [blame] | 1445 | * __dev_alloc_skb - allocate an skbuff for receiving |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | * @length: length to allocate |
| 1447 | * @gfp_mask: get_free_pages mask, passed to alloc_skb |
| 1448 | * |
| 1449 | * Allocate a new &sk_buff and assign it a usage count of one. The |
| 1450 | * buffer has unspecified headroom built in. Users should allocate |
| 1451 | * the headroom they think they need without accounting for the |
| 1452 | * built in space. The built in space is used for optimisations. |
| 1453 | * |
Christoph Hellwig | 766ea8c | 2006-08-07 15:49:53 -0700 | [diff] [blame] | 1454 | * %NULL is returned if there is no free memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | static inline struct sk_buff *__dev_alloc_skb(unsigned int length, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1457 | gfp_t gfp_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | { |
Anton Blanchard | 025be81 | 2006-03-31 02:27:06 -0800 | [diff] [blame] | 1459 | struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD, gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | if (likely(skb)) |
Anton Blanchard | 025be81 | 2006-03-31 02:27:06 -0800 | [diff] [blame] | 1461 | skb_reserve(skb, NET_SKB_PAD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | return skb; |
| 1463 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | |
Ilpo Järvinen | f58518e | 2008-03-27 17:51:31 -0700 | [diff] [blame] | 1465 | extern struct sk_buff *dev_alloc_skb(unsigned int length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | |
Christoph Hellwig | 8af2745 | 2006-07-31 22:35:23 -0700 | [diff] [blame] | 1467 | extern struct sk_buff *__netdev_alloc_skb(struct net_device *dev, |
| 1468 | unsigned int length, gfp_t gfp_mask); |
| 1469 | |
| 1470 | /** |
| 1471 | * netdev_alloc_skb - allocate an skbuff for rx on a specific device |
| 1472 | * @dev: network device to receive on |
| 1473 | * @length: length to allocate |
| 1474 | * |
| 1475 | * Allocate a new &sk_buff and assign it a usage count of one. The |
| 1476 | * buffer has unspecified headroom built in. Users should allocate |
| 1477 | * the headroom they think they need without accounting for the |
| 1478 | * built in space. The built in space is used for optimisations. |
| 1479 | * |
| 1480 | * %NULL is returned if there is no free memory. Although this function |
| 1481 | * allocates memory it can be called from an interrupt. |
| 1482 | */ |
| 1483 | static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev, |
| 1484 | unsigned int length) |
| 1485 | { |
| 1486 | return __netdev_alloc_skb(dev, length, GFP_ATOMIC); |
| 1487 | } |
| 1488 | |
Peter Zijlstra | 654bed1 | 2008-10-07 14:22:33 -0700 | [diff] [blame] | 1489 | extern struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask); |
| 1490 | |
| 1491 | /** |
| 1492 | * netdev_alloc_page - allocate a page for ps-rx on a specific device |
| 1493 | * @dev: network device to receive on |
| 1494 | * |
| 1495 | * Allocate a new page node local to the specified device. |
| 1496 | * |
| 1497 | * %NULL is returned if there is no free memory. |
| 1498 | */ |
| 1499 | static inline struct page *netdev_alloc_page(struct net_device *dev) |
| 1500 | { |
| 1501 | return __netdev_alloc_page(dev, GFP_ATOMIC); |
| 1502 | } |
| 1503 | |
| 1504 | static inline void netdev_free_page(struct net_device *dev, struct page *page) |
| 1505 | { |
| 1506 | __free_page(page); |
| 1507 | } |
| 1508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | /** |
Patrick McHardy | 334a813 | 2007-06-25 04:35:20 -0700 | [diff] [blame] | 1510 | * skb_clone_writable - is the header of a clone writable |
| 1511 | * @skb: buffer to check |
| 1512 | * @len: length up to which to write |
| 1513 | * |
| 1514 | * Returns true if modifying the header part of the cloned buffer |
| 1515 | * does not requires the data to be copied. |
| 1516 | */ |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 1517 | static inline int skb_clone_writable(struct sk_buff *skb, unsigned int len) |
Patrick McHardy | 334a813 | 2007-06-25 04:35:20 -0700 | [diff] [blame] | 1518 | { |
| 1519 | return !skb_header_cloned(skb) && |
| 1520 | skb_headroom(skb) + len <= skb->hdr_len; |
| 1521 | } |
| 1522 | |
Herbert Xu | d9cc204 | 2007-09-16 16:21:16 -0700 | [diff] [blame] | 1523 | static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom, |
| 1524 | int cloned) |
| 1525 | { |
| 1526 | int delta = 0; |
| 1527 | |
| 1528 | if (headroom < NET_SKB_PAD) |
| 1529 | headroom = NET_SKB_PAD; |
| 1530 | if (headroom > skb_headroom(skb)) |
| 1531 | delta = headroom - skb_headroom(skb); |
| 1532 | |
| 1533 | if (delta || cloned) |
| 1534 | return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0, |
| 1535 | GFP_ATOMIC); |
| 1536 | return 0; |
| 1537 | } |
| 1538 | |
Patrick McHardy | 334a813 | 2007-06-25 04:35:20 -0700 | [diff] [blame] | 1539 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | * skb_cow - copy header of skb when it is required |
| 1541 | * @skb: buffer to cow |
| 1542 | * @headroom: needed headroom |
| 1543 | * |
| 1544 | * If the skb passed lacks sufficient headroom or its data part |
| 1545 | * is shared, data is reallocated. If reallocation fails, an error |
| 1546 | * is returned and original skb is not changed. |
| 1547 | * |
| 1548 | * The result is skb with writable area skb->head...skb->tail |
| 1549 | * and at least @headroom of space at head. |
| 1550 | */ |
| 1551 | static inline int skb_cow(struct sk_buff *skb, unsigned int headroom) |
| 1552 | { |
Herbert Xu | d9cc204 | 2007-09-16 16:21:16 -0700 | [diff] [blame] | 1553 | return __skb_cow(skb, headroom, skb_cloned(skb)); |
| 1554 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | |
Herbert Xu | d9cc204 | 2007-09-16 16:21:16 -0700 | [diff] [blame] | 1556 | /** |
| 1557 | * skb_cow_head - skb_cow but only making the head writable |
| 1558 | * @skb: buffer to cow |
| 1559 | * @headroom: needed headroom |
| 1560 | * |
| 1561 | * This function is identical to skb_cow except that we replace the |
| 1562 | * skb_cloned check by skb_header_cloned. It should be used when |
| 1563 | * you only need to push on some header and do not need to modify |
| 1564 | * the data. |
| 1565 | */ |
| 1566 | static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom) |
| 1567 | { |
| 1568 | return __skb_cow(skb, headroom, skb_header_cloned(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | } |
| 1570 | |
| 1571 | /** |
| 1572 | * skb_padto - pad an skbuff up to a minimal size |
| 1573 | * @skb: buffer to pad |
| 1574 | * @len: minimal length |
| 1575 | * |
| 1576 | * Pads up a buffer to ensure the trailing bytes exist and are |
| 1577 | * blanked. If the buffer already contains sufficient data it |
Herbert Xu | 5b057c6 | 2006-06-23 02:06:41 -0700 | [diff] [blame] | 1578 | * is untouched. Otherwise it is extended. Returns zero on |
| 1579 | * success. The skb is freed on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | */ |
| 1581 | |
Herbert Xu | 5b057c6 | 2006-06-23 02:06:41 -0700 | [diff] [blame] | 1582 | static inline int skb_padto(struct sk_buff *skb, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | { |
| 1584 | unsigned int size = skb->len; |
| 1585 | if (likely(size >= len)) |
Herbert Xu | 5b057c6 | 2006-06-23 02:06:41 -0700 | [diff] [blame] | 1586 | return 0; |
Gerrit Renker | 987c402 | 2008-08-11 18:17:17 -0700 | [diff] [blame] | 1587 | return skb_pad(skb, len - size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | } |
| 1589 | |
| 1590 | static inline int skb_add_data(struct sk_buff *skb, |
| 1591 | char __user *from, int copy) |
| 1592 | { |
| 1593 | const int off = skb->len; |
| 1594 | |
| 1595 | if (skb->ip_summed == CHECKSUM_NONE) { |
| 1596 | int err = 0; |
Al Viro | 5084205 | 2006-11-14 21:36:34 -0800 | [diff] [blame] | 1597 | __wsum csum = csum_and_copy_from_user(from, skb_put(skb, copy), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | copy, 0, &err); |
| 1599 | if (!err) { |
| 1600 | skb->csum = csum_block_add(skb->csum, csum, off); |
| 1601 | return 0; |
| 1602 | } |
| 1603 | } else if (!copy_from_user(skb_put(skb, copy), from, copy)) |
| 1604 | return 0; |
| 1605 | |
| 1606 | __skb_trim(skb, off); |
| 1607 | return -EFAULT; |
| 1608 | } |
| 1609 | |
| 1610 | static inline int skb_can_coalesce(struct sk_buff *skb, int i, |
| 1611 | struct page *page, int off) |
| 1612 | { |
| 1613 | if (i) { |
| 1614 | struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i - 1]; |
| 1615 | |
| 1616 | return page == frag->page && |
| 1617 | off == frag->page_offset + frag->size; |
| 1618 | } |
| 1619 | return 0; |
| 1620 | } |
| 1621 | |
Herbert Xu | 364c6ba | 2006-06-09 16:10:40 -0700 | [diff] [blame] | 1622 | static inline int __skb_linearize(struct sk_buff *skb) |
| 1623 | { |
| 1624 | return __pskb_pull_tail(skb, skb->data_len) ? 0 : -ENOMEM; |
| 1625 | } |
| 1626 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | /** |
| 1628 | * skb_linearize - convert paged skb to linear one |
| 1629 | * @skb: buffer to linarize |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | * |
| 1631 | * If there is no free memory -ENOMEM is returned, otherwise zero |
| 1632 | * is returned and the old skb data released. |
| 1633 | */ |
Herbert Xu | 364c6ba | 2006-06-09 16:10:40 -0700 | [diff] [blame] | 1634 | static inline int skb_linearize(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | { |
Herbert Xu | 364c6ba | 2006-06-09 16:10:40 -0700 | [diff] [blame] | 1636 | return skb_is_nonlinear(skb) ? __skb_linearize(skb) : 0; |
| 1637 | } |
| 1638 | |
| 1639 | /** |
| 1640 | * skb_linearize_cow - make sure skb is linear and writable |
| 1641 | * @skb: buffer to process |
| 1642 | * |
| 1643 | * If there is no free memory -ENOMEM is returned, otherwise zero |
| 1644 | * is returned and the old skb data released. |
| 1645 | */ |
| 1646 | static inline int skb_linearize_cow(struct sk_buff *skb) |
| 1647 | { |
| 1648 | return skb_is_nonlinear(skb) || skb_cloned(skb) ? |
| 1649 | __skb_linearize(skb) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | } |
| 1651 | |
| 1652 | /** |
| 1653 | * skb_postpull_rcsum - update checksum for received skb after pull |
| 1654 | * @skb: buffer to update |
| 1655 | * @start: start of data before pull |
| 1656 | * @len: length of data pulled |
| 1657 | * |
| 1658 | * After doing a pull on a received packet, you need to call this to |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1659 | * update the CHECKSUM_COMPLETE checksum, or set ip_summed to |
| 1660 | * CHECKSUM_NONE so that it can be recomputed from scratch. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | */ |
| 1662 | |
| 1663 | static inline void skb_postpull_rcsum(struct sk_buff *skb, |
Herbert Xu | cbb042f | 2006-03-20 22:43:56 -0800 | [diff] [blame] | 1664 | const void *start, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1666 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0)); |
| 1668 | } |
| 1669 | |
Herbert Xu | cbb042f | 2006-03-20 22:43:56 -0800 | [diff] [blame] | 1670 | unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len); |
| 1671 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | /** |
| 1673 | * pskb_trim_rcsum - trim received skb and update checksum |
| 1674 | * @skb: buffer to trim |
| 1675 | * @len: new length |
| 1676 | * |
| 1677 | * This is exactly the same as pskb_trim except that it ensures the |
| 1678 | * checksum of received packets are still valid after the operation. |
| 1679 | */ |
| 1680 | |
| 1681 | static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len) |
| 1682 | { |
Stephen Hemminger | 0e4e422 | 2005-09-08 12:32:03 -0700 | [diff] [blame] | 1683 | if (likely(len >= skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | return 0; |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1685 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | skb->ip_summed = CHECKSUM_NONE; |
| 1687 | return __pskb_trim(skb, len); |
| 1688 | } |
| 1689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | #define skb_queue_walk(queue, skb) \ |
| 1691 | for (skb = (queue)->next; \ |
| 1692 | prefetch(skb->next), (skb != (struct sk_buff *)(queue)); \ |
| 1693 | skb = skb->next) |
| 1694 | |
James Chapman | 46f8914 | 2007-04-30 00:07:31 -0700 | [diff] [blame] | 1695 | #define skb_queue_walk_safe(queue, skb, tmp) \ |
| 1696 | for (skb = (queue)->next, tmp = skb->next; \ |
| 1697 | skb != (struct sk_buff *)(queue); \ |
| 1698 | skb = tmp, tmp = skb->next) |
| 1699 | |
David S. Miller | 1164f52 | 2008-09-23 00:49:44 -0700 | [diff] [blame] | 1700 | #define skb_queue_walk_from(queue, skb) \ |
| 1701 | for (; prefetch(skb->next), (skb != (struct sk_buff *)(queue)); \ |
| 1702 | skb = skb->next) |
| 1703 | |
| 1704 | #define skb_queue_walk_from_safe(queue, skb, tmp) \ |
| 1705 | for (tmp = skb->next; \ |
| 1706 | skb != (struct sk_buff *)(queue); \ |
| 1707 | skb = tmp, tmp = skb->next) |
| 1708 | |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 1709 | #define skb_queue_reverse_walk(queue, skb) \ |
| 1710 | for (skb = (queue)->prev; \ |
| 1711 | prefetch(skb->prev), (skb != (struct sk_buff *)(queue)); \ |
| 1712 | skb = skb->prev) |
| 1713 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | |
David S. Miller | ee03987 | 2009-06-09 00:17:13 -0700 | [diff] [blame] | 1715 | static inline bool skb_has_frags(const struct sk_buff *skb) |
| 1716 | { |
| 1717 | return skb_shinfo(skb)->frag_list != NULL; |
| 1718 | } |
| 1719 | |
| 1720 | static inline void skb_frag_list_init(struct sk_buff *skb) |
| 1721 | { |
| 1722 | skb_shinfo(skb)->frag_list = NULL; |
| 1723 | } |
| 1724 | |
| 1725 | static inline void skb_frag_add_head(struct sk_buff *skb, struct sk_buff *frag) |
| 1726 | { |
| 1727 | frag->next = skb_shinfo(skb)->frag_list; |
| 1728 | skb_shinfo(skb)->frag_list = frag; |
| 1729 | } |
| 1730 | |
| 1731 | #define skb_walk_frags(skb, iter) \ |
| 1732 | for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next) |
| 1733 | |
Herbert Xu | a59322b | 2007-12-05 01:53:40 -0800 | [diff] [blame] | 1734 | extern struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags, |
| 1735 | int *peeked, int *err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | extern struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags, |
| 1737 | int noblock, int *err); |
| 1738 | extern unsigned int datagram_poll(struct file *file, struct socket *sock, |
| 1739 | struct poll_table_struct *wait); |
| 1740 | extern int skb_copy_datagram_iovec(const struct sk_buff *from, |
| 1741 | int offset, struct iovec *to, |
| 1742 | int size); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1743 | extern int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | int hlen, |
| 1745 | struct iovec *iov); |
Rusty Russell | db543c1 | 2008-08-15 15:13:53 -0700 | [diff] [blame] | 1746 | extern int skb_copy_datagram_from_iovec(struct sk_buff *skb, |
| 1747 | int offset, |
Michael S. Tsirkin | 6f26c9a | 2009-04-20 01:26:11 +0000 | [diff] [blame] | 1748 | const struct iovec *from, |
| 1749 | int from_offset, |
Rusty Russell | db543c1 | 2008-08-15 15:13:53 -0700 | [diff] [blame] | 1750 | int len); |
Michael S. Tsirkin | 0a1ec07 | 2009-04-20 01:25:46 +0000 | [diff] [blame] | 1751 | extern int skb_copy_datagram_const_iovec(const struct sk_buff *from, |
| 1752 | int offset, |
| 1753 | const struct iovec *to, |
| 1754 | int to_offset, |
| 1755 | int size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | extern void skb_free_datagram(struct sock *sk, struct sk_buff *skb); |
Herbert Xu | 27ab256 | 2007-12-05 01:51:58 -0800 | [diff] [blame] | 1757 | extern int skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
Herbert Xu | 3305b80 | 2005-12-13 23:16:37 -0800 | [diff] [blame] | 1758 | unsigned int flags); |
Al Viro | 2bbbc86 | 2006-11-14 21:37:14 -0800 | [diff] [blame] | 1759 | extern __wsum skb_checksum(const struct sk_buff *skb, int offset, |
| 1760 | int len, __wsum csum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | extern int skb_copy_bits(const struct sk_buff *skb, int offset, |
| 1762 | void *to, int len); |
Stephen Hemminger | 0c6fcc8 | 2007-04-20 16:40:01 -0700 | [diff] [blame] | 1763 | extern int skb_store_bits(struct sk_buff *skb, int offset, |
| 1764 | const void *from, int len); |
Al Viro | 81d7766 | 2006-11-14 21:37:33 -0800 | [diff] [blame] | 1765 | extern __wsum skb_copy_and_csum_bits(const struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | int offset, u8 *to, int len, |
Al Viro | 81d7766 | 2006-11-14 21:37:33 -0800 | [diff] [blame] | 1767 | __wsum csum); |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 1768 | extern int skb_splice_bits(struct sk_buff *skb, |
| 1769 | unsigned int offset, |
| 1770 | struct pipe_inode_info *pipe, |
| 1771 | unsigned int len, |
| 1772 | unsigned int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | extern void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to); |
| 1774 | extern void skb_split(struct sk_buff *skb, |
| 1775 | struct sk_buff *skb1, const u32 len); |
Ilpo Järvinen | 832d11c | 2008-11-24 21:20:15 -0800 | [diff] [blame] | 1776 | extern int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, |
| 1777 | int shiftlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1778 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 1779 | extern struct sk_buff *skb_segment(struct sk_buff *skb, int features); |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1780 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | static inline void *skb_header_pointer(const struct sk_buff *skb, int offset, |
| 1782 | int len, void *buffer) |
| 1783 | { |
| 1784 | int hlen = skb_headlen(skb); |
| 1785 | |
Patrick McHardy | 55820ee | 2005-07-05 14:08:10 -0700 | [diff] [blame] | 1786 | if (hlen - offset >= len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | return skb->data + offset; |
| 1788 | |
| 1789 | if (skb_copy_bits(skb, offset, buffer, len) < 0) |
| 1790 | return NULL; |
| 1791 | |
| 1792 | return buffer; |
| 1793 | } |
| 1794 | |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 1795 | static inline void skb_copy_from_linear_data(const struct sk_buff *skb, |
| 1796 | void *to, |
| 1797 | const unsigned int len) |
| 1798 | { |
| 1799 | memcpy(to, skb->data, len); |
| 1800 | } |
| 1801 | |
| 1802 | static inline void skb_copy_from_linear_data_offset(const struct sk_buff *skb, |
| 1803 | const int offset, void *to, |
| 1804 | const unsigned int len) |
| 1805 | { |
| 1806 | memcpy(to, skb->data + offset, len); |
| 1807 | } |
| 1808 | |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 1809 | static inline void skb_copy_to_linear_data(struct sk_buff *skb, |
| 1810 | const void *from, |
| 1811 | const unsigned int len) |
| 1812 | { |
| 1813 | memcpy(skb->data, from, len); |
| 1814 | } |
| 1815 | |
| 1816 | static inline void skb_copy_to_linear_data_offset(struct sk_buff *skb, |
| 1817 | const int offset, |
| 1818 | const void *from, |
| 1819 | const unsigned int len) |
| 1820 | { |
| 1821 | memcpy(skb->data + offset, from, len); |
| 1822 | } |
| 1823 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | extern void skb_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1826 | static inline ktime_t skb_get_ktime(const struct sk_buff *skb) |
| 1827 | { |
| 1828 | return skb->tstamp; |
| 1829 | } |
| 1830 | |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1831 | /** |
| 1832 | * skb_get_timestamp - get timestamp from a skb |
| 1833 | * @skb: skb to get stamp from |
| 1834 | * @stamp: pointer to struct timeval to store stamp in |
| 1835 | * |
| 1836 | * Timestamps are stored in the skb as offsets to a base timestamp. |
| 1837 | * This function converts the offset back to a struct timeval and stores |
| 1838 | * it in stamp. |
| 1839 | */ |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1840 | static inline void skb_get_timestamp(const struct sk_buff *skb, |
| 1841 | struct timeval *stamp) |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1842 | { |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1843 | *stamp = ktime_to_timeval(skb->tstamp); |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1844 | } |
| 1845 | |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1846 | static inline void skb_get_timestampns(const struct sk_buff *skb, |
| 1847 | struct timespec *stamp) |
| 1848 | { |
| 1849 | *stamp = ktime_to_timespec(skb->tstamp); |
| 1850 | } |
| 1851 | |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1852 | static inline void __net_timestamp(struct sk_buff *skb) |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1853 | { |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1854 | skb->tstamp = ktime_get_real(); |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1855 | } |
| 1856 | |
Stephen Hemminger | 164891a | 2007-04-23 22:26:16 -0700 | [diff] [blame] | 1857 | static inline ktime_t net_timedelta(ktime_t t) |
| 1858 | { |
| 1859 | return ktime_sub(ktime_get_real(), t); |
| 1860 | } |
| 1861 | |
Ilpo Järvinen | b9ce204 | 2007-06-15 15:08:43 -0700 | [diff] [blame] | 1862 | static inline ktime_t net_invalid_timestamp(void) |
| 1863 | { |
| 1864 | return ktime_set(0, 0); |
| 1865 | } |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1866 | |
Patrick Ohly | ac45f60 | 2009-02-12 05:03:37 +0000 | [diff] [blame] | 1867 | /** |
| 1868 | * skb_tstamp_tx - queue clone of skb with send time stamps |
| 1869 | * @orig_skb: the original outgoing packet |
| 1870 | * @hwtstamps: hardware time stamps, may be NULL if not available |
| 1871 | * |
| 1872 | * If the skb has a socket associated, then this function clones the |
| 1873 | * skb (thus sharing the actual data and optional structures), stores |
| 1874 | * the optional hardware time stamping information (if non NULL) or |
| 1875 | * generates a software time stamp (otherwise), then queues the clone |
| 1876 | * to the error queue of the socket. Errors are silently ignored. |
| 1877 | */ |
| 1878 | extern void skb_tstamp_tx(struct sk_buff *orig_skb, |
| 1879 | struct skb_shared_hwtstamps *hwtstamps); |
| 1880 | |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 1881 | extern __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len); |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 1882 | extern __sum16 __skb_checksum_complete(struct sk_buff *skb); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1883 | |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 1884 | static inline int skb_csum_unnecessary(const struct sk_buff *skb) |
| 1885 | { |
| 1886 | return skb->ip_summed & CHECKSUM_UNNECESSARY; |
| 1887 | } |
| 1888 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1889 | /** |
| 1890 | * skb_checksum_complete - Calculate checksum of an entire packet |
| 1891 | * @skb: packet to process |
| 1892 | * |
| 1893 | * This function calculates the checksum over the entire packet plus |
| 1894 | * the value of skb->csum. The latter can be used to supply the |
| 1895 | * checksum of a pseudo header as used by TCP/UDP. It returns the |
| 1896 | * checksum. |
| 1897 | * |
| 1898 | * For protocols that contain complete checksums such as ICMP/TCP/UDP, |
| 1899 | * this function can be used to verify that checksum on received |
| 1900 | * packets. In that case the function should return zero if the |
| 1901 | * checksum is correct. In particular, this function will return zero |
| 1902 | * if skb->ip_summed is CHECKSUM_UNNECESSARY which indicates that the |
| 1903 | * hardware has already verified the correctness of the checksum. |
| 1904 | */ |
Al Viro | 4381ca3 | 2007-07-15 21:00:11 +0100 | [diff] [blame] | 1905 | static inline __sum16 skb_checksum_complete(struct sk_buff *skb) |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1906 | { |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 1907 | return skb_csum_unnecessary(skb) ? |
| 1908 | 0 : __skb_checksum_complete(skb); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1909 | } |
| 1910 | |
Yasuyuki Kozakai | 5f79e0f | 2007-03-23 11:17:07 -0700 | [diff] [blame] | 1911 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
Yasuyuki Kozakai | de6e05c | 2007-03-23 11:17:27 -0700 | [diff] [blame] | 1912 | extern void nf_conntrack_destroy(struct nf_conntrack *nfct); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | static inline void nf_conntrack_put(struct nf_conntrack *nfct) |
| 1914 | { |
| 1915 | if (nfct && atomic_dec_and_test(&nfct->use)) |
Yasuyuki Kozakai | de6e05c | 2007-03-23 11:17:27 -0700 | [diff] [blame] | 1916 | nf_conntrack_destroy(nfct); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | } |
| 1918 | static inline void nf_conntrack_get(struct nf_conntrack *nfct) |
| 1919 | { |
| 1920 | if (nfct) |
| 1921 | atomic_inc(&nfct->use); |
| 1922 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1923 | static inline void nf_conntrack_get_reasm(struct sk_buff *skb) |
| 1924 | { |
| 1925 | if (skb) |
| 1926 | atomic_inc(&skb->users); |
| 1927 | } |
| 1928 | static inline void nf_conntrack_put_reasm(struct sk_buff *skb) |
| 1929 | { |
| 1930 | if (skb) |
| 1931 | kfree_skb(skb); |
| 1932 | } |
| 1933 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 1935 | static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge) |
| 1936 | { |
| 1937 | if (nf_bridge && atomic_dec_and_test(&nf_bridge->use)) |
| 1938 | kfree(nf_bridge); |
| 1939 | } |
| 1940 | static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge) |
| 1941 | { |
| 1942 | if (nf_bridge) |
| 1943 | atomic_inc(&nf_bridge->use); |
| 1944 | } |
| 1945 | #endif /* CONFIG_BRIDGE_NETFILTER */ |
Patrick McHardy | a193a4a | 2006-03-20 19:23:05 -0800 | [diff] [blame] | 1946 | static inline void nf_reset(struct sk_buff *skb) |
| 1947 | { |
Yasuyuki Kozakai | 5f79e0f | 2007-03-23 11:17:07 -0700 | [diff] [blame] | 1948 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
Patrick McHardy | a193a4a | 2006-03-20 19:23:05 -0800 | [diff] [blame] | 1949 | nf_conntrack_put(skb->nfct); |
| 1950 | skb->nfct = NULL; |
Patrick McHardy | a193a4a | 2006-03-20 19:23:05 -0800 | [diff] [blame] | 1951 | nf_conntrack_put_reasm(skb->nfct_reasm); |
| 1952 | skb->nfct_reasm = NULL; |
| 1953 | #endif |
| 1954 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 1955 | nf_bridge_put(skb->nf_bridge); |
| 1956 | skb->nf_bridge = NULL; |
| 1957 | #endif |
| 1958 | } |
| 1959 | |
Yasuyuki Kozakai | edda553 | 2007-03-14 16:43:37 -0700 | [diff] [blame] | 1960 | /* Note: This doesn't put any conntrack and bridge info in dst. */ |
| 1961 | static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src) |
| 1962 | { |
Yasuyuki Kozakai | 5f79e0f | 2007-03-23 11:17:07 -0700 | [diff] [blame] | 1963 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
Yasuyuki Kozakai | edda553 | 2007-03-14 16:43:37 -0700 | [diff] [blame] | 1964 | dst->nfct = src->nfct; |
| 1965 | nf_conntrack_get(src->nfct); |
| 1966 | dst->nfctinfo = src->nfctinfo; |
Yasuyuki Kozakai | edda553 | 2007-03-14 16:43:37 -0700 | [diff] [blame] | 1967 | dst->nfct_reasm = src->nfct_reasm; |
| 1968 | nf_conntrack_get_reasm(src->nfct_reasm); |
| 1969 | #endif |
| 1970 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 1971 | dst->nf_bridge = src->nf_bridge; |
| 1972 | nf_bridge_get(src->nf_bridge); |
| 1973 | #endif |
| 1974 | } |
| 1975 | |
Yasuyuki Kozakai | e7ac05f | 2007-03-14 16:44:01 -0700 | [diff] [blame] | 1976 | static inline void nf_copy(struct sk_buff *dst, const struct sk_buff *src) |
| 1977 | { |
Yasuyuki Kozakai | e7ac05f | 2007-03-14 16:44:01 -0700 | [diff] [blame] | 1978 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
Yasuyuki Kozakai | 5f79e0f | 2007-03-23 11:17:07 -0700 | [diff] [blame] | 1979 | nf_conntrack_put(dst->nfct); |
Yasuyuki Kozakai | e7ac05f | 2007-03-14 16:44:01 -0700 | [diff] [blame] | 1980 | nf_conntrack_put_reasm(dst->nfct_reasm); |
| 1981 | #endif |
| 1982 | #ifdef CONFIG_BRIDGE_NETFILTER |
| 1983 | nf_bridge_put(dst->nf_bridge); |
| 1984 | #endif |
| 1985 | __nf_copy(dst, src); |
| 1986 | } |
| 1987 | |
James Morris | 984bc16 | 2006-06-09 00:29:17 -0700 | [diff] [blame] | 1988 | #ifdef CONFIG_NETWORK_SECMARK |
| 1989 | static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from) |
| 1990 | { |
| 1991 | to->secmark = from->secmark; |
| 1992 | } |
| 1993 | |
| 1994 | static inline void skb_init_secmark(struct sk_buff *skb) |
| 1995 | { |
| 1996 | skb->secmark = 0; |
| 1997 | } |
| 1998 | #else |
| 1999 | static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from) |
| 2000 | { } |
| 2001 | |
| 2002 | static inline void skb_init_secmark(struct sk_buff *skb) |
| 2003 | { } |
| 2004 | #endif |
| 2005 | |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 2006 | static inline void skb_set_queue_mapping(struct sk_buff *skb, u16 queue_mapping) |
| 2007 | { |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 2008 | skb->queue_mapping = queue_mapping; |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 2009 | } |
| 2010 | |
Stephen Hemminger | 9247744 | 2009-03-21 13:39:26 -0700 | [diff] [blame] | 2011 | static inline u16 skb_get_queue_mapping(const struct sk_buff *skb) |
Pavel Emelyanov | 4e3ab47 | 2007-10-21 17:01:29 -0700 | [diff] [blame] | 2012 | { |
Pavel Emelyanov | 4e3ab47 | 2007-10-21 17:01:29 -0700 | [diff] [blame] | 2013 | return skb->queue_mapping; |
Pavel Emelyanov | 4e3ab47 | 2007-10-21 17:01:29 -0700 | [diff] [blame] | 2014 | } |
| 2015 | |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 2016 | static inline void skb_copy_queue_mapping(struct sk_buff *to, const struct sk_buff *from) |
| 2017 | { |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 2018 | to->queue_mapping = from->queue_mapping; |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 2019 | } |
| 2020 | |
David S. Miller | d5a9e24 | 2009-01-27 16:22:11 -0800 | [diff] [blame] | 2021 | static inline void skb_record_rx_queue(struct sk_buff *skb, u16 rx_queue) |
| 2022 | { |
| 2023 | skb->queue_mapping = rx_queue + 1; |
| 2024 | } |
| 2025 | |
Stephen Hemminger | 9247744 | 2009-03-21 13:39:26 -0700 | [diff] [blame] | 2026 | static inline u16 skb_get_rx_queue(const struct sk_buff *skb) |
David S. Miller | d5a9e24 | 2009-01-27 16:22:11 -0800 | [diff] [blame] | 2027 | { |
| 2028 | return skb->queue_mapping - 1; |
| 2029 | } |
| 2030 | |
Stephen Hemminger | 9247744 | 2009-03-21 13:39:26 -0700 | [diff] [blame] | 2031 | static inline bool skb_rx_queue_recorded(const struct sk_buff *skb) |
David S. Miller | d5a9e24 | 2009-01-27 16:22:11 -0800 | [diff] [blame] | 2032 | { |
| 2033 | return (skb->queue_mapping != 0); |
| 2034 | } |
| 2035 | |
Stephen Hemminger | 9247744 | 2009-03-21 13:39:26 -0700 | [diff] [blame] | 2036 | extern u16 skb_tx_hash(const struct net_device *dev, |
| 2037 | const struct sk_buff *skb); |
| 2038 | |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 2039 | #ifdef CONFIG_XFRM |
| 2040 | static inline struct sec_path *skb_sec_path(struct sk_buff *skb) |
| 2041 | { |
| 2042 | return skb->sp; |
| 2043 | } |
| 2044 | #else |
| 2045 | static inline struct sec_path *skb_sec_path(struct sk_buff *skb) |
| 2046 | { |
| 2047 | return NULL; |
| 2048 | } |
| 2049 | #endif |
| 2050 | |
Herbert Xu | 89114af | 2006-07-08 13:34:32 -0700 | [diff] [blame] | 2051 | static inline int skb_is_gso(const struct sk_buff *skb) |
| 2052 | { |
| 2053 | return skb_shinfo(skb)->gso_size; |
| 2054 | } |
| 2055 | |
Brice Goglin | eabd7e3 | 2007-10-13 12:33:32 +0200 | [diff] [blame] | 2056 | static inline int skb_is_gso_v6(const struct sk_buff *skb) |
| 2057 | { |
| 2058 | return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6; |
| 2059 | } |
| 2060 | |
Ben Hutchings | 4497b07 | 2008-06-19 16:22:28 -0700 | [diff] [blame] | 2061 | extern void __skb_warn_lro_forwarding(const struct sk_buff *skb); |
| 2062 | |
| 2063 | static inline bool skb_warn_if_lro(const struct sk_buff *skb) |
| 2064 | { |
| 2065 | /* LRO sets gso_size but not gso_type, whereas if GSO is really |
| 2066 | * wanted then gso_type will be set. */ |
| 2067 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
| 2068 | if (shinfo->gso_size != 0 && unlikely(shinfo->gso_type == 0)) { |
| 2069 | __skb_warn_lro_forwarding(skb); |
| 2070 | return true; |
| 2071 | } |
| 2072 | return false; |
| 2073 | } |
| 2074 | |
Herbert Xu | 35fc92a | 2007-03-26 23:22:20 -0700 | [diff] [blame] | 2075 | static inline void skb_forward_csum(struct sk_buff *skb) |
| 2076 | { |
| 2077 | /* Unfortunately we don't support this one. Any brave souls? */ |
| 2078 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
| 2079 | skb->ip_summed = CHECKSUM_NONE; |
| 2080 | } |
| 2081 | |
Rusty Russell | f35d9d8 | 2008-02-04 23:49:54 -0500 | [diff] [blame] | 2082 | bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | #endif /* __KERNEL__ */ |
| 2084 | #endif /* _LINUX_SKBUFF_H */ |