Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * Definitions for the AF_INET socket handler. |
| 7 | * |
| 8 | * Version: @(#)sock.h 1.0.4 05/13/93 |
| 9 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 12 | * Corey Minyard <wf-rch!minyard@relay.EU.net> |
| 13 | * Florian La Roche <flla@stud.uni-sb.de> |
| 14 | * |
| 15 | * Fixes: |
| 16 | * Alan Cox : Volatiles in skbuff pointers. See |
| 17 | * skbuff comments. May be overdone, |
| 18 | * better to prove they can be removed |
| 19 | * than the reverse. |
| 20 | * Alan Cox : Added a zapped field for tcp to note |
| 21 | * a socket is reset and must stay shut up |
| 22 | * Alan Cox : New fields for options |
| 23 | * Pauline Middelink : identd support |
| 24 | * Alan Cox : Eliminate low level recv/recvfrom |
| 25 | * David S. Miller : New socket lookup architecture. |
| 26 | * Steve Whitehouse: Default routines for sock_ops |
| 27 | * Arnaldo C. Melo : removed net_pinfo, tp_pinfo and made |
| 28 | * protinfo be just a void pointer, as the |
| 29 | * protocol specific parts were moved to |
| 30 | * respective headers and ipv4/v6, etc now |
| 31 | * use private slabcaches for its socks |
| 32 | * Pedro Hortas : New flags field for socket options |
| 33 | * |
| 34 | * |
| 35 | * This program is free software; you can redistribute it and/or |
| 36 | * modify it under the terms of the GNU General Public License |
| 37 | * as published by the Free Software Foundation; either version |
| 38 | * 2 of the License, or (at your option) any later version. |
| 39 | */ |
| 40 | #ifndef _SOCK_H |
| 41 | #define _SOCK_H |
| 42 | |
Ilpo Järvinen | 172589c | 2007-08-28 15:50:33 -0700 | [diff] [blame] | 43 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/list.h> |
| 45 | #include <linux/timer.h> |
| 46 | #include <linux/cache.h> |
| 47 | #include <linux/module.h> |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 48 | #include <linux/lockdep.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/netdevice.h> |
Arnaldo Carvalho de Melo | ebb53d7 | 2007-11-21 22:08:50 +0800 | [diff] [blame] | 50 | #include <linux/pcounter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <linux/skbuff.h> /* struct sk_buff */ |
Al Viro | d7fe0f2 | 2006-12-03 23:15:30 -0500 | [diff] [blame] | 52 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <linux/security.h> |
| 54 | |
| 55 | #include <linux/filter.h> |
| 56 | |
| 57 | #include <asm/atomic.h> |
| 58 | #include <net/dst.h> |
| 59 | #include <net/checksum.h> |
| 60 | |
| 61 | /* |
| 62 | * This structure really needs to be cleaned up. |
| 63 | * Most of it is for TCP, and not used by any of |
| 64 | * the other protocols. |
| 65 | */ |
| 66 | |
| 67 | /* Define this to get the SOCK_DBG debugging facility. */ |
| 68 | #define SOCK_DEBUGGING |
| 69 | #ifdef SOCK_DEBUGGING |
| 70 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ |
| 71 | printk(KERN_DEBUG msg); } while (0) |
| 72 | #else |
| 73 | #define SOCK_DEBUG(sk, msg...) do { } while (0) |
| 74 | #endif |
| 75 | |
| 76 | /* This is the per-socket lock. The spinlock provides a synchronization |
| 77 | * between user contexts and software interrupt processing, whereas the |
| 78 | * mini-semaphore synchronizes multiple users amongst themselves. |
| 79 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | typedef struct { |
| 81 | spinlock_t slock; |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 82 | int owned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | wait_queue_head_t wq; |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 84 | /* |
| 85 | * We express the mutex-alike socket_lock semantics |
| 86 | * to the lock validator by explicitly managing |
| 87 | * the slock as a lock variant (in addition to |
| 88 | * the slock itself): |
| 89 | */ |
| 90 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 91 | struct lockdep_map dep_map; |
| 92 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } socket_lock_t; |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | struct sock; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 96 | struct proto; |
Denis V. Lunev | 0eeb8ff | 2007-12-04 01:15:45 -0800 | [diff] [blame] | 97 | struct net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
| 99 | /** |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 100 | * struct sock_common - minimal network layer representation of sockets |
| 101 | * @skc_family: network address family |
| 102 | * @skc_state: Connection state |
| 103 | * @skc_reuse: %SO_REUSEADDR setting |
| 104 | * @skc_bound_dev_if: bound device index if != 0 |
| 105 | * @skc_node: main hash linkage for various protocol lookup tables |
| 106 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
| 107 | * @skc_refcnt: reference count |
Eric Dumazet | 81c3d54 | 2005-10-03 14:13:38 -0700 | [diff] [blame] | 108 | * @skc_hash: hash value used with various protocol lookup tables |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 109 | * @skc_prot: protocol handlers inside a network family |
Eric W. Biederman | 07feaeb | 2007-09-12 11:58:02 +0200 | [diff] [blame] | 110 | * @skc_net: reference to the network namespace of this socket |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 111 | * |
| 112 | * This is the minimal network layer representation of sockets, the header |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 113 | * for struct sock and struct inet_timewait_sock. |
| 114 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | struct sock_common { |
| 116 | unsigned short skc_family; |
| 117 | volatile unsigned char skc_state; |
| 118 | unsigned char skc_reuse; |
| 119 | int skc_bound_dev_if; |
| 120 | struct hlist_node skc_node; |
| 121 | struct hlist_node skc_bind_node; |
| 122 | atomic_t skc_refcnt; |
Eric Dumazet | 81c3d54 | 2005-10-03 14:13:38 -0700 | [diff] [blame] | 123 | unsigned int skc_hash; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 124 | struct proto *skc_prot; |
Eric W. Biederman | 07feaeb | 2007-09-12 11:58:02 +0200 | [diff] [blame] | 125 | struct net *skc_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | }; |
| 127 | |
| 128 | /** |
| 129 | * struct sock - network layer representation of sockets |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 130 | * @__sk_common: shared layout with inet_timewait_sock |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 131 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
| 132 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings |
| 133 | * @sk_lock: synchronizer |
| 134 | * @sk_rcvbuf: size of receive buffer in bytes |
| 135 | * @sk_sleep: sock wait queue |
| 136 | * @sk_dst_cache: destination cache |
| 137 | * @sk_dst_lock: destination cache lock |
| 138 | * @sk_policy: flow policy |
| 139 | * @sk_rmem_alloc: receive queue bytes committed |
| 140 | * @sk_receive_queue: incoming packets |
| 141 | * @sk_wmem_alloc: transmit queue bytes committed |
| 142 | * @sk_write_queue: Packet sending queue |
Chris Leech | 97fc2f0 | 2006-05-23 17:55:33 -0700 | [diff] [blame] | 143 | * @sk_async_wait_queue: DMA copied packets |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 144 | * @sk_omem_alloc: "o" is "option" or "other" |
| 145 | * @sk_wmem_queued: persistent queue size |
| 146 | * @sk_forward_alloc: space allocated forward |
| 147 | * @sk_allocation: allocation mode |
| 148 | * @sk_sndbuf: size of send buffer in bytes |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 149 | * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, |
| 150 | * %SO_OOBINLINE settings |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 151 | * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets |
| 152 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 153 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 154 | * @sk_lingertime: %SO_LINGER l_linger setting |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 155 | * @sk_backlog: always used with the per-socket spinlock held |
| 156 | * @sk_callback_lock: used with the callbacks in the end of this struct |
| 157 | * @sk_error_queue: rarely used |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 158 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
| 159 | * IPV6_ADDRFORM for instance) |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 160 | * @sk_err: last error |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 161 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
| 162 | * persistent failure not just 'timed out' |
| 163 | * @sk_drops: raw drops counter |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 164 | * @sk_ack_backlog: current listen backlog |
| 165 | * @sk_max_ack_backlog: listen backlog set in listen() |
| 166 | * @sk_priority: %SO_PRIORITY setting |
| 167 | * @sk_type: socket type (%SOCK_STREAM, etc) |
| 168 | * @sk_protocol: which protocol this socket belongs in this network family |
| 169 | * @sk_peercred: %SO_PEERCRED setting |
| 170 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
| 171 | * @sk_rcvtimeo: %SO_RCVTIMEO setting |
| 172 | * @sk_sndtimeo: %SO_SNDTIMEO setting |
| 173 | * @sk_filter: socket filtering instructions |
| 174 | * @sk_protinfo: private area, net family specific, when not using slab |
| 175 | * @sk_timer: sock cleanup timer |
| 176 | * @sk_stamp: time stamp of last packet received |
| 177 | * @sk_socket: Identd and reporting IO signals |
| 178 | * @sk_user_data: RPC layer private data |
| 179 | * @sk_sndmsg_page: cached page for sendmsg |
| 180 | * @sk_sndmsg_off: cached offset for sendmsg |
| 181 | * @sk_send_head: front of stuff to transmit |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 182 | * @sk_security: used by security modules |
Randy Dunlap | 3172936 | 2008-02-18 20:52:13 -0800 | [diff] [blame] | 183 | * @sk_mark: generic packet mark |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 184 | * @sk_write_pending: a write to stream socket waits to start |
| 185 | * @sk_state_change: callback to indicate change in the state of the sock |
| 186 | * @sk_data_ready: callback to indicate there is data to be processed |
| 187 | * @sk_write_space: callback to indicate there is bf sending space available |
| 188 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) |
| 189 | * @sk_backlog_rcv: callback to process the backlog |
| 190 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | */ |
| 192 | struct sock { |
| 193 | /* |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 194 | * Now struct inet_timewait_sock also uses sock_common, so please just |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | * don't add nothing before this first member (__sk_common) --acme |
| 196 | */ |
| 197 | struct sock_common __sk_common; |
| 198 | #define sk_family __sk_common.skc_family |
| 199 | #define sk_state __sk_common.skc_state |
| 200 | #define sk_reuse __sk_common.skc_reuse |
| 201 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if |
| 202 | #define sk_node __sk_common.skc_node |
| 203 | #define sk_bind_node __sk_common.skc_bind_node |
| 204 | #define sk_refcnt __sk_common.skc_refcnt |
Eric Dumazet | 81c3d54 | 2005-10-03 14:13:38 -0700 | [diff] [blame] | 205 | #define sk_hash __sk_common.skc_hash |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 206 | #define sk_prot __sk_common.skc_prot |
Eric W. Biederman | 07feaeb | 2007-09-12 11:58:02 +0200 | [diff] [blame] | 207 | #define sk_net __sk_common.skc_net |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | unsigned char sk_shutdown : 2, |
| 209 | sk_no_check : 2, |
| 210 | sk_userlocks : 4; |
| 211 | unsigned char sk_protocol; |
| 212 | unsigned short sk_type; |
| 213 | int sk_rcvbuf; |
| 214 | socket_lock_t sk_lock; |
Eric Dumazet | fa438cc | 2007-03-04 16:05:44 -0800 | [diff] [blame] | 215 | /* |
| 216 | * The backlog queue is special, it is always used with |
| 217 | * the per-socket spinlock held and requires low latency |
| 218 | * access. Therefore we special case it's implementation. |
| 219 | */ |
| 220 | struct { |
| 221 | struct sk_buff *head; |
| 222 | struct sk_buff *tail; |
| 223 | } sk_backlog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | wait_queue_head_t *sk_sleep; |
| 225 | struct dst_entry *sk_dst_cache; |
| 226 | struct xfrm_policy *sk_policy[2]; |
| 227 | rwlock_t sk_dst_lock; |
| 228 | atomic_t sk_rmem_alloc; |
| 229 | atomic_t sk_wmem_alloc; |
| 230 | atomic_t sk_omem_alloc; |
Arnaldo Carvalho de Melo | 4e07a91 | 2007-05-29 13:17:47 -0700 | [diff] [blame] | 231 | int sk_sndbuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | struct sk_buff_head sk_receive_queue; |
| 233 | struct sk_buff_head sk_write_queue; |
Chris Leech | 97fc2f0 | 2006-05-23 17:55:33 -0700 | [diff] [blame] | 234 | struct sk_buff_head sk_async_wait_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | int sk_wmem_queued; |
| 236 | int sk_forward_alloc; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 237 | gfp_t sk_allocation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | int sk_route_caps; |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 239 | int sk_gso_type; |
David S. Miller | 9932cf9 | 2006-03-24 15:12:37 -0800 | [diff] [blame] | 240 | int sk_rcvlowat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | unsigned long sk_flags; |
| 242 | unsigned long sk_lingertime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | struct sk_buff_head sk_error_queue; |
Arnaldo Carvalho de Melo | 476e19c | 2005-05-05 13:35:15 -0700 | [diff] [blame] | 244 | struct proto *sk_prot_creator; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | rwlock_t sk_callback_lock; |
| 246 | int sk_err, |
| 247 | sk_err_soft; |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 248 | atomic_t sk_drops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | unsigned short sk_ack_backlog; |
| 250 | unsigned short sk_max_ack_backlog; |
| 251 | __u32 sk_priority; |
| 252 | struct ucred sk_peercred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | long sk_rcvtimeo; |
| 254 | long sk_sndtimeo; |
| 255 | struct sk_filter *sk_filter; |
| 256 | void *sk_protinfo; |
| 257 | struct timer_list sk_timer; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 258 | ktime_t sk_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | struct socket *sk_socket; |
| 260 | void *sk_user_data; |
| 261 | struct page *sk_sndmsg_page; |
| 262 | struct sk_buff *sk_send_head; |
| 263 | __u32 sk_sndmsg_off; |
| 264 | int sk_write_pending; |
| 265 | void *sk_security; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 266 | __u32 sk_mark; |
| 267 | /* XXX 4 bytes hole on 64 bit */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | void (*sk_state_change)(struct sock *sk); |
| 269 | void (*sk_data_ready)(struct sock *sk, int bytes); |
| 270 | void (*sk_write_space)(struct sock *sk); |
| 271 | void (*sk_error_report)(struct sock *sk); |
| 272 | int (*sk_backlog_rcv)(struct sock *sk, |
| 273 | struct sk_buff *skb); |
| 274 | void (*sk_destruct)(struct sock *sk); |
| 275 | }; |
| 276 | |
| 277 | /* |
| 278 | * Hashed lists helper routines |
| 279 | */ |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 280 | static inline struct sock *__sk_head(const struct hlist_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | { |
| 282 | return hlist_entry(head->first, struct sock, sk_node); |
| 283 | } |
| 284 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 285 | static inline struct sock *sk_head(const struct hlist_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
| 287 | return hlist_empty(head) ? NULL : __sk_head(head); |
| 288 | } |
| 289 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 290 | static inline struct sock *sk_next(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | { |
| 292 | return sk->sk_node.next ? |
| 293 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; |
| 294 | } |
| 295 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 296 | static inline int sk_unhashed(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
| 298 | return hlist_unhashed(&sk->sk_node); |
| 299 | } |
| 300 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 301 | static inline int sk_hashed(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | { |
Akinobu Mita | da753be | 2006-04-28 15:21:23 -0700 | [diff] [blame] | 303 | return !sk_unhashed(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | static __inline__ void sk_node_init(struct hlist_node *node) |
| 307 | { |
| 308 | node->pprev = NULL; |
| 309 | } |
| 310 | |
| 311 | static __inline__ void __sk_del_node(struct sock *sk) |
| 312 | { |
| 313 | __hlist_del(&sk->sk_node); |
| 314 | } |
| 315 | |
| 316 | static __inline__ int __sk_del_node_init(struct sock *sk) |
| 317 | { |
| 318 | if (sk_hashed(sk)) { |
| 319 | __sk_del_node(sk); |
| 320 | sk_node_init(&sk->sk_node); |
| 321 | return 1; |
| 322 | } |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | /* Grab socket reference count. This operation is valid only |
| 327 | when sk is ALREADY grabbed f.e. it is found in hash table |
| 328 | or a list and the lookup is made under lock preventing hash table |
| 329 | modifications. |
| 330 | */ |
| 331 | |
| 332 | static inline void sock_hold(struct sock *sk) |
| 333 | { |
| 334 | atomic_inc(&sk->sk_refcnt); |
| 335 | } |
| 336 | |
| 337 | /* Ungrab socket in the context, which assumes that socket refcnt |
| 338 | cannot hit zero, f.e. it is true in context of any socketcall. |
| 339 | */ |
| 340 | static inline void __sock_put(struct sock *sk) |
| 341 | { |
| 342 | atomic_dec(&sk->sk_refcnt); |
| 343 | } |
| 344 | |
| 345 | static __inline__ int sk_del_node_init(struct sock *sk) |
| 346 | { |
| 347 | int rc = __sk_del_node_init(sk); |
| 348 | |
| 349 | if (rc) { |
| 350 | /* paranoid for a while -acme */ |
| 351 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); |
| 352 | __sock_put(sk); |
| 353 | } |
| 354 | return rc; |
| 355 | } |
| 356 | |
| 357 | static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list) |
| 358 | { |
| 359 | hlist_add_head(&sk->sk_node, list); |
| 360 | } |
| 361 | |
| 362 | static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list) |
| 363 | { |
| 364 | sock_hold(sk); |
| 365 | __sk_add_node(sk, list); |
| 366 | } |
| 367 | |
| 368 | static __inline__ void __sk_del_bind_node(struct sock *sk) |
| 369 | { |
| 370 | __hlist_del(&sk->sk_bind_node); |
| 371 | } |
| 372 | |
| 373 | static __inline__ void sk_add_bind_node(struct sock *sk, |
| 374 | struct hlist_head *list) |
| 375 | { |
| 376 | hlist_add_head(&sk->sk_bind_node, list); |
| 377 | } |
| 378 | |
| 379 | #define sk_for_each(__sk, node, list) \ |
| 380 | hlist_for_each_entry(__sk, node, list, sk_node) |
| 381 | #define sk_for_each_from(__sk, node) \ |
| 382 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ |
| 383 | hlist_for_each_entry_from(__sk, node, sk_node) |
| 384 | #define sk_for_each_continue(__sk, node) \ |
| 385 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ |
| 386 | hlist_for_each_entry_continue(__sk, node, sk_node) |
| 387 | #define sk_for_each_safe(__sk, node, tmp, list) \ |
| 388 | hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node) |
| 389 | #define sk_for_each_bound(__sk, node, list) \ |
| 390 | hlist_for_each_entry(__sk, node, list, sk_bind_node) |
| 391 | |
| 392 | /* Sock flags */ |
| 393 | enum sock_flags { |
| 394 | SOCK_DEAD, |
| 395 | SOCK_DONE, |
| 396 | SOCK_URGINLINE, |
| 397 | SOCK_KEEPOPEN, |
| 398 | SOCK_LINGER, |
| 399 | SOCK_DESTROY, |
| 400 | SOCK_BROADCAST, |
| 401 | SOCK_TIMESTAMP, |
| 402 | SOCK_ZAPPED, |
| 403 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ |
| 404 | SOCK_DBG, /* %SO_DEBUG setting */ |
| 405 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 406 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
| 408 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ |
| 409 | }; |
| 410 | |
Ralf Baechle | 53b924b | 2005-08-23 10:11:30 -0700 | [diff] [blame] | 411 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
| 412 | { |
| 413 | nsk->sk_flags = osk->sk_flags; |
| 414 | } |
| 415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
| 417 | { |
| 418 | __set_bit(flag, &sk->sk_flags); |
| 419 | } |
| 420 | |
| 421 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) |
| 422 | { |
| 423 | __clear_bit(flag, &sk->sk_flags); |
| 424 | } |
| 425 | |
| 426 | static inline int sock_flag(struct sock *sk, enum sock_flags flag) |
| 427 | { |
| 428 | return test_bit(flag, &sk->sk_flags); |
| 429 | } |
| 430 | |
| 431 | static inline void sk_acceptq_removed(struct sock *sk) |
| 432 | { |
| 433 | sk->sk_ack_backlog--; |
| 434 | } |
| 435 | |
| 436 | static inline void sk_acceptq_added(struct sock *sk) |
| 437 | { |
| 438 | sk->sk_ack_backlog++; |
| 439 | } |
| 440 | |
| 441 | static inline int sk_acceptq_is_full(struct sock *sk) |
| 442 | { |
David S. Miller | 64a1465 | 2007-03-06 11:21:05 -0800 | [diff] [blame] | 443 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | /* |
| 447 | * Compute minimal free write space needed to queue new packets. |
| 448 | */ |
| 449 | static inline int sk_stream_min_wspace(struct sock *sk) |
| 450 | { |
Eric Dumazet | 8df09ea | 2007-12-21 03:07:41 -0800 | [diff] [blame] | 451 | return sk->sk_wmem_queued >> 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | static inline int sk_stream_wspace(struct sock *sk) |
| 455 | { |
| 456 | return sk->sk_sndbuf - sk->sk_wmem_queued; |
| 457 | } |
| 458 | |
| 459 | extern void sk_stream_write_space(struct sock *sk); |
| 460 | |
| 461 | static inline int sk_stream_memory_free(struct sock *sk) |
| 462 | { |
| 463 | return sk->sk_wmem_queued < sk->sk_sndbuf; |
| 464 | } |
| 465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | /* The per-socket spinlock must be held here. */ |
Stephen Hemminger | 9ee6b53 | 2005-11-08 09:39:42 -0800 | [diff] [blame] | 467 | static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
| 468 | { |
| 469 | if (!sk->sk_backlog.tail) { |
| 470 | sk->sk_backlog.head = sk->sk_backlog.tail = skb; |
| 471 | } else { |
| 472 | sk->sk_backlog.tail->next = skb; |
| 473 | sk->sk_backlog.tail = skb; |
| 474 | } |
| 475 | skb->next = NULL; |
| 476 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 478 | #define sk_wait_event(__sk, __timeo, __condition) \ |
| 479 | ({ int __rc; \ |
| 480 | release_sock(__sk); \ |
| 481 | __rc = __condition; \ |
| 482 | if (!__rc) { \ |
| 483 | *(__timeo) = schedule_timeout(*(__timeo)); \ |
| 484 | } \ |
| 485 | lock_sock(__sk); \ |
| 486 | __rc = __condition; \ |
| 487 | __rc; \ |
| 488 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); |
| 491 | extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); |
| 492 | extern void sk_stream_wait_close(struct sock *sk, long timeo_p); |
| 493 | extern int sk_stream_error(struct sock *sk, int flags, int err); |
| 494 | extern void sk_stream_kill_queues(struct sock *sk); |
| 495 | |
| 496 | extern int sk_wait_data(struct sock *sk, long *timeo); |
| 497 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 498 | struct request_sock_ops; |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 499 | struct timewait_sock_ops; |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 500 | struct inet_hashinfo; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | /* Networking protocol blocks we attach to sockets. |
| 503 | * socket layer -> transport layer interface |
| 504 | * transport -> network interface is defined by struct inet_proto |
| 505 | */ |
| 506 | struct proto { |
| 507 | void (*close)(struct sock *sk, |
| 508 | long timeout); |
| 509 | int (*connect)(struct sock *sk, |
| 510 | struct sockaddr *uaddr, |
| 511 | int addr_len); |
| 512 | int (*disconnect)(struct sock *sk, int flags); |
| 513 | |
| 514 | struct sock * (*accept) (struct sock *sk, int flags, int *err); |
| 515 | |
| 516 | int (*ioctl)(struct sock *sk, int cmd, |
| 517 | unsigned long arg); |
| 518 | int (*init)(struct sock *sk); |
| 519 | int (*destroy)(struct sock *sk); |
| 520 | void (*shutdown)(struct sock *sk, int how); |
| 521 | int (*setsockopt)(struct sock *sk, int level, |
| 522 | int optname, char __user *optval, |
| 523 | int optlen); |
| 524 | int (*getsockopt)(struct sock *sk, int level, |
| 525 | int optname, char __user *optval, |
| 526 | int __user *option); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 527 | int (*compat_setsockopt)(struct sock *sk, |
| 528 | int level, |
| 529 | int optname, char __user *optval, |
| 530 | int optlen); |
| 531 | int (*compat_getsockopt)(struct sock *sk, |
| 532 | int level, |
| 533 | int optname, char __user *optval, |
| 534 | int __user *option); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | int (*sendmsg)(struct kiocb *iocb, struct sock *sk, |
| 536 | struct msghdr *msg, size_t len); |
| 537 | int (*recvmsg)(struct kiocb *iocb, struct sock *sk, |
| 538 | struct msghdr *msg, |
| 539 | size_t len, int noblock, int flags, |
| 540 | int *addr_len); |
| 541 | int (*sendpage)(struct sock *sk, struct page *page, |
| 542 | int offset, size_t size, int flags); |
| 543 | int (*bind)(struct sock *sk, |
| 544 | struct sockaddr *uaddr, int addr_len); |
| 545 | |
| 546 | int (*backlog_rcv) (struct sock *sk, |
| 547 | struct sk_buff *skb); |
| 548 | |
| 549 | /* Keeping track of sk's, looking them up, and port selection methods. */ |
| 550 | void (*hash)(struct sock *sk); |
| 551 | void (*unhash)(struct sock *sk); |
| 552 | int (*get_port)(struct sock *sk, unsigned short snum); |
| 553 | |
Eric Dumazet | 286ab3d | 2007-11-05 23:38:39 -0800 | [diff] [blame] | 554 | /* Keeping track of sockets in use */ |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 555 | #ifdef CONFIG_PROC_FS |
Arnaldo Carvalho de Melo | ebb53d7 | 2007-11-21 22:08:50 +0800 | [diff] [blame] | 556 | struct pcounter inuse; |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 557 | #endif |
Arnaldo Carvalho de Melo | ebb53d7 | 2007-11-21 22:08:50 +0800 | [diff] [blame] | 558 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | /* Memory pressure */ |
| 560 | void (*enter_memory_pressure)(void); |
| 561 | atomic_t *memory_allocated; /* Current allocated memory. */ |
| 562 | atomic_t *sockets_allocated; /* Current number of sockets. */ |
| 563 | /* |
| 564 | * Pressure flag: try to collapse. |
| 565 | * Technical note: it is used by multiple contexts non atomically. |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 566 | * All the __sk_mem_schedule() is of this nature: accounting |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | * is strict, actions are advisory and have some latency. |
| 568 | */ |
| 569 | int *memory_pressure; |
| 570 | int *sysctl_mem; |
| 571 | int *sysctl_wmem; |
| 572 | int *sysctl_rmem; |
| 573 | int max_header; |
| 574 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 575 | struct kmem_cache *slab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | unsigned int obj_size; |
| 577 | |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 578 | atomic_t *orphan_count; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 579 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 580 | struct request_sock_ops *rsk_prot; |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 581 | struct timewait_sock_ops *twsk_prot; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 582 | |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 583 | struct inet_hashinfo *hashinfo; |
| 584 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | struct module *owner; |
| 586 | |
| 587 | char name[32]; |
| 588 | |
| 589 | struct list_head node; |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 590 | #ifdef SOCK_REFCNT_DEBUG |
| 591 | atomic_t socks; |
| 592 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | }; |
| 594 | |
| 595 | extern int proto_register(struct proto *prot, int alloc_slab); |
| 596 | extern void proto_unregister(struct proto *prot); |
| 597 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 598 | #ifdef SOCK_REFCNT_DEBUG |
| 599 | static inline void sk_refcnt_debug_inc(struct sock *sk) |
| 600 | { |
| 601 | atomic_inc(&sk->sk_prot->socks); |
| 602 | } |
| 603 | |
| 604 | static inline void sk_refcnt_debug_dec(struct sock *sk) |
| 605 | { |
| 606 | atomic_dec(&sk->sk_prot->socks); |
| 607 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", |
| 608 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); |
| 609 | } |
| 610 | |
| 611 | static inline void sk_refcnt_debug_release(const struct sock *sk) |
| 612 | { |
| 613 | if (atomic_read(&sk->sk_refcnt) != 1) |
| 614 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", |
| 615 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); |
| 616 | } |
| 617 | #else /* SOCK_REFCNT_DEBUG */ |
| 618 | #define sk_refcnt_debug_inc(sk) do { } while (0) |
| 619 | #define sk_refcnt_debug_dec(sk) do { } while (0) |
| 620 | #define sk_refcnt_debug_release(sk) do { } while (0) |
| 621 | #endif /* SOCK_REFCNT_DEBUG */ |
| 622 | |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 623 | |
| 624 | #ifdef CONFIG_PROC_FS |
| 625 | # define DEFINE_PROTO_INUSE(NAME) DEFINE_PCOUNTER(NAME) |
| 626 | # define REF_PROTO_INUSE(NAME) PCOUNTER_MEMBER_INITIALIZER(NAME, .inuse) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | /* Called with local bh disabled */ |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 628 | static inline void sock_prot_inuse_add(struct proto *prot, int inc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | { |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 630 | pcounter_add(&prot->inuse, inc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | } |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 632 | static inline int sock_prot_inuse_init(struct proto *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | { |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 634 | return pcounter_alloc(&proto->inuse); |
Eric Dumazet | 286ab3d | 2007-11-05 23:38:39 -0800 | [diff] [blame] | 635 | } |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 636 | static inline int sock_prot_inuse_get(struct proto *proto) |
Eric Dumazet | 286ab3d | 2007-11-05 23:38:39 -0800 | [diff] [blame] | 637 | { |
Arnaldo Carvalho de Melo | ebb53d7 | 2007-11-21 22:08:50 +0800 | [diff] [blame] | 638 | return pcounter_getval(&proto->inuse); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 640 | static inline void sock_prot_inuse_free(struct proto *proto) |
| 641 | { |
| 642 | pcounter_free(&proto->inuse); |
| 643 | } |
| 644 | #else |
| 645 | # define DEFINE_PROTO_INUSE(NAME) |
| 646 | # define REF_PROTO_INUSE(NAME) |
| 647 | static void inline sock_prot_inuse_add(struct proto *prot, int inc) |
| 648 | { |
| 649 | } |
| 650 | static int inline sock_prot_inuse_init(struct proto *proto) |
| 651 | { |
| 652 | return 0; |
| 653 | } |
| 654 | static void inline sock_prot_inuse_free(struct proto *proto) |
| 655 | { |
| 656 | } |
| 657 | #endif |
| 658 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Arnaldo Carvalho de Melo | 614c6cb | 2005-08-09 19:47:37 -0700 | [diff] [blame] | 660 | /* With per-bucket locks this operation is not-atomic, so that |
| 661 | * this version is not worse. |
| 662 | */ |
| 663 | static inline void __sk_prot_rehash(struct sock *sk) |
| 664 | { |
| 665 | sk->sk_prot->unhash(sk); |
| 666 | sk->sk_prot->hash(sk); |
| 667 | } |
| 668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | /* About 10 seconds */ |
| 670 | #define SOCK_DESTROY_TIME (10*HZ) |
| 671 | |
| 672 | /* Sockets 0-1023 can't be bound to unless you are superuser */ |
| 673 | #define PROT_SOCK 1024 |
| 674 | |
| 675 | #define SHUTDOWN_MASK 3 |
| 676 | #define RCV_SHUTDOWN 1 |
| 677 | #define SEND_SHUTDOWN 2 |
| 678 | |
| 679 | #define SOCK_SNDBUF_LOCK 1 |
| 680 | #define SOCK_RCVBUF_LOCK 2 |
| 681 | #define SOCK_BINDADDR_LOCK 4 |
| 682 | #define SOCK_BINDPORT_LOCK 8 |
| 683 | |
| 684 | /* sock_iocb: used to kick off async processing of socket ios */ |
| 685 | struct sock_iocb { |
| 686 | struct list_head list; |
| 687 | |
| 688 | int flags; |
| 689 | int size; |
| 690 | struct socket *sock; |
| 691 | struct sock *sk; |
| 692 | struct scm_cookie *scm; |
| 693 | struct msghdr *msg, async_msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | struct kiocb *kiocb; |
| 695 | }; |
| 696 | |
| 697 | static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) |
| 698 | { |
| 699 | return (struct sock_iocb *)iocb->private; |
| 700 | } |
| 701 | |
| 702 | static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) |
| 703 | { |
| 704 | return si->kiocb; |
| 705 | } |
| 706 | |
| 707 | struct socket_alloc { |
| 708 | struct socket socket; |
| 709 | struct inode vfs_inode; |
| 710 | }; |
| 711 | |
| 712 | static inline struct socket *SOCKET_I(struct inode *inode) |
| 713 | { |
| 714 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; |
| 715 | } |
| 716 | |
| 717 | static inline struct inode *SOCK_INODE(struct socket *socket) |
| 718 | { |
| 719 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; |
| 720 | } |
| 721 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 722 | /* |
| 723 | * Functions for memory accounting |
| 724 | */ |
| 725 | extern int __sk_mem_schedule(struct sock *sk, int size, int kind); |
| 726 | extern void __sk_mem_reclaim(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 728 | #define SK_MEM_QUANTUM ((int)PAGE_SIZE) |
| 729 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) |
| 730 | #define SK_MEM_SEND 0 |
| 731 | #define SK_MEM_RECV 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 733 | static inline int sk_mem_pages(int amt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 735 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | } |
| 737 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 738 | static inline int sk_has_account(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 740 | /* return true if protocol supports memory accounting */ |
| 741 | return !!sk->sk_prot->memory_allocated; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
| 743 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 744 | static inline int sk_wmem_schedule(struct sock *sk, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 746 | if (!sk_has_account(sk)) |
| 747 | return 1; |
Herbert Xu | d80d99d | 2005-09-01 17:48:23 -0700 | [diff] [blame] | 748 | return size <= sk->sk_forward_alloc || |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 749 | __sk_mem_schedule(sk, size, SK_MEM_SEND); |
| 750 | } |
| 751 | |
| 752 | static inline int sk_rmem_schedule(struct sock *sk, int size) |
| 753 | { |
| 754 | if (!sk_has_account(sk)) |
| 755 | return 1; |
| 756 | return size <= sk->sk_forward_alloc || |
| 757 | __sk_mem_schedule(sk, size, SK_MEM_RECV); |
| 758 | } |
| 759 | |
| 760 | static inline void sk_mem_reclaim(struct sock *sk) |
| 761 | { |
| 762 | if (!sk_has_account(sk)) |
| 763 | return; |
| 764 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) |
| 765 | __sk_mem_reclaim(sk); |
| 766 | } |
| 767 | |
David S. Miller | 9993e7d | 2008-01-10 21:56:38 -0800 | [diff] [blame] | 768 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
| 769 | { |
| 770 | if (!sk_has_account(sk)) |
| 771 | return; |
| 772 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) |
| 773 | __sk_mem_reclaim(sk); |
| 774 | } |
| 775 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 776 | static inline void sk_mem_charge(struct sock *sk, int size) |
| 777 | { |
| 778 | if (!sk_has_account(sk)) |
| 779 | return; |
| 780 | sk->sk_forward_alloc -= size; |
| 781 | } |
| 782 | |
| 783 | static inline void sk_mem_uncharge(struct sock *sk, int size) |
| 784 | { |
| 785 | if (!sk_has_account(sk)) |
| 786 | return; |
| 787 | sk->sk_forward_alloc += size; |
| 788 | } |
| 789 | |
| 790 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) |
| 791 | { |
| 792 | skb_truesize_check(skb); |
| 793 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
| 794 | sk->sk_wmem_queued -= skb->truesize; |
| 795 | sk_mem_uncharge(sk, skb->truesize); |
| 796 | __kfree_skb(skb); |
Herbert Xu | d80d99d | 2005-09-01 17:48:23 -0700 | [diff] [blame] | 797 | } |
| 798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | /* Used by processes to "lock" a socket state, so that |
| 800 | * interrupts and bottom half handlers won't change it |
| 801 | * from under us. It essentially blocks any incoming |
| 802 | * packets, so that we won't get any new data or any |
| 803 | * packets that change the state of the socket. |
| 804 | * |
| 805 | * While locked, BH processing will add new packets to |
| 806 | * the backlog queue. This queue is processed by the |
| 807 | * owner of the socket lock right before it is released. |
| 808 | * |
| 809 | * Since ~2.3.5 it is also exclusive sleep lock serializing |
| 810 | * accesses from user process context. |
| 811 | */ |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 812 | #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 814 | /* |
| 815 | * Macro so as to not evaluate some arguments when |
| 816 | * lockdep is not enabled. |
| 817 | * |
| 818 | * Mark both the sk_lock and the sk_lock.slock as a |
| 819 | * per-address-family lock class. |
| 820 | */ |
| 821 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ |
| 822 | do { \ |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 823 | sk->sk_lock.owned = 0; \ |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 824 | init_waitqueue_head(&sk->sk_lock.wq); \ |
| 825 | spin_lock_init(&(sk)->sk_lock.slock); \ |
| 826 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ |
| 827 | sizeof((sk)->sk_lock)); \ |
| 828 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ |
| 829 | (skey), (sname)); \ |
| 830 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ |
| 831 | } while (0) |
| 832 | |
Harvey Harrison | 4138093 | 2007-12-12 10:46:51 -0800 | [diff] [blame] | 833 | extern void lock_sock_nested(struct sock *sk, int subclass); |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 834 | |
| 835 | static inline void lock_sock(struct sock *sk) |
| 836 | { |
| 837 | lock_sock_nested(sk, 0); |
| 838 | } |
| 839 | |
Harvey Harrison | 4138093 | 2007-12-12 10:46:51 -0800 | [diff] [blame] | 840 | extern void release_sock(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
| 842 | /* BH context may only use the following locking interface. */ |
| 843 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) |
Ingo Molnar | c636618 | 2006-07-03 00:25:13 -0700 | [diff] [blame] | 844 | #define bh_lock_sock_nested(__sk) \ |
| 845 | spin_lock_nested(&((__sk)->sk_lock.slock), \ |
| 846 | SINGLE_DEPTH_NESTING) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
| 848 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 849 | extern struct sock *sk_alloc(struct net *net, int family, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 850 | gfp_t priority, |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 851 | struct proto *prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | extern void sk_free(struct sock *sk); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 853 | extern struct sock *sk_clone(const struct sock *sk, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 854 | const gfp_t priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
| 856 | extern struct sk_buff *sock_wmalloc(struct sock *sk, |
| 857 | unsigned long size, int force, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 858 | gfp_t priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | extern struct sk_buff *sock_rmalloc(struct sock *sk, |
| 860 | unsigned long size, int force, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 861 | gfp_t priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | extern void sock_wfree(struct sk_buff *skb); |
| 863 | extern void sock_rfree(struct sk_buff *skb); |
| 864 | |
| 865 | extern int sock_setsockopt(struct socket *sock, int level, |
| 866 | int op, char __user *optval, |
| 867 | int optlen); |
| 868 | |
| 869 | extern int sock_getsockopt(struct socket *sock, int level, |
| 870 | int op, char __user *optval, |
| 871 | int __user *optlen); |
| 872 | extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, |
| 873 | unsigned long size, |
| 874 | int noblock, |
| 875 | int *errcode); |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 876 | extern void *sock_kmalloc(struct sock *sk, int size, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 877 | gfp_t priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | extern void sock_kfree_s(struct sock *sk, void *mem, int size); |
| 879 | extern void sk_send_sigurg(struct sock *sk); |
| 880 | |
| 881 | /* |
| 882 | * Functions to fill in entries in struct proto_ops when a protocol |
| 883 | * does not implement a particular function. |
| 884 | */ |
| 885 | extern int sock_no_bind(struct socket *, |
| 886 | struct sockaddr *, int); |
| 887 | extern int sock_no_connect(struct socket *, |
| 888 | struct sockaddr *, int, int); |
| 889 | extern int sock_no_socketpair(struct socket *, |
| 890 | struct socket *); |
| 891 | extern int sock_no_accept(struct socket *, |
| 892 | struct socket *, int); |
| 893 | extern int sock_no_getname(struct socket *, |
| 894 | struct sockaddr *, int *, int); |
| 895 | extern unsigned int sock_no_poll(struct file *, struct socket *, |
| 896 | struct poll_table_struct *); |
| 897 | extern int sock_no_ioctl(struct socket *, unsigned int, |
| 898 | unsigned long); |
| 899 | extern int sock_no_listen(struct socket *, int); |
| 900 | extern int sock_no_shutdown(struct socket *, int); |
| 901 | extern int sock_no_getsockopt(struct socket *, int , int, |
| 902 | char __user *, int __user *); |
| 903 | extern int sock_no_setsockopt(struct socket *, int, int, |
| 904 | char __user *, int); |
| 905 | extern int sock_no_sendmsg(struct kiocb *, struct socket *, |
| 906 | struct msghdr *, size_t); |
| 907 | extern int sock_no_recvmsg(struct kiocb *, struct socket *, |
| 908 | struct msghdr *, size_t, int); |
| 909 | extern int sock_no_mmap(struct file *file, |
| 910 | struct socket *sock, |
| 911 | struct vm_area_struct *vma); |
| 912 | extern ssize_t sock_no_sendpage(struct socket *sock, |
| 913 | struct page *page, |
| 914 | int offset, size_t size, |
| 915 | int flags); |
| 916 | |
| 917 | /* |
| 918 | * Functions to fill in entries in struct proto_ops when a protocol |
| 919 | * uses the inet style. |
| 920 | */ |
| 921 | extern int sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 922 | char __user *optval, int __user *optlen); |
| 923 | extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 924 | struct msghdr *msg, size_t size, int flags); |
| 925 | extern int sock_common_setsockopt(struct socket *sock, int level, int optname, |
| 926 | char __user *optval, int optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 927 | extern int compat_sock_common_getsockopt(struct socket *sock, int level, |
| 928 | int optname, char __user *optval, int __user *optlen); |
| 929 | extern int compat_sock_common_setsockopt(struct socket *sock, int level, |
| 930 | int optname, char __user *optval, int optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | |
| 932 | extern void sk_common_release(struct sock *sk); |
| 933 | |
| 934 | /* |
| 935 | * Default socket callbacks and setup code |
| 936 | */ |
| 937 | |
| 938 | /* Initialise core socket variables */ |
| 939 | extern void sock_init_data(struct socket *sock, struct sock *sk); |
| 940 | |
| 941 | /** |
| 942 | * sk_filter - run a packet through a socket filter |
| 943 | * @sk: sock associated with &sk_buff |
| 944 | * @skb: buffer to filter |
| 945 | * @needlock: set to 1 if the sock is not locked by caller. |
| 946 | * |
| 947 | * Run the filter code and then cut skb->data to correct size returned by |
| 948 | * sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller |
| 949 | * than pkt_len we keep whole skb->data. This is the socket level |
| 950 | * wrapper to sk_run_filter. It returns 0 if the packet should |
| 951 | * be accepted or -EPERM if the packet should be tossed. |
| 952 | * |
| 953 | */ |
| 954 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 955 | static inline int sk_filter(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | { |
| 957 | int err; |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 958 | struct sk_filter *filter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
| 960 | err = security_sock_rcv_skb(sk, skb); |
| 961 | if (err) |
| 962 | return err; |
| 963 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 964 | rcu_read_lock_bh(); |
Eric Dumazet | 9d3e444 | 2008-01-08 23:41:28 -0800 | [diff] [blame] | 965 | filter = rcu_dereference(sk->sk_filter); |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 966 | if (filter) { |
| 967 | unsigned int pkt_len = sk_run_filter(skb, filter->insns, |
| 968 | filter->len); |
| 969 | err = pkt_len ? pskb_trim(skb, pkt_len) : -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | } |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 971 | rcu_read_unlock_bh(); |
| 972 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | return err; |
| 974 | } |
| 975 | |
| 976 | /** |
Paul Bonser | dc9b334 | 2006-11-23 17:56:13 -0800 | [diff] [blame] | 977 | * sk_filter_release: Release a socket filter |
| 978 | * @sk: socket |
| 979 | * @fp: filter to remove |
| 980 | * |
| 981 | * Remove a filter from a socket and release its resources. |
| 982 | */ |
| 983 | |
Pavel Emelyanov | 309dd5f | 2007-10-17 21:21:51 -0700 | [diff] [blame] | 984 | static inline void sk_filter_release(struct sk_filter *fp) |
| 985 | { |
| 986 | if (atomic_dec_and_test(&fp->refcnt)) |
Pavel Emelyanov | 47e958e | 2007-10-17 21:22:42 -0700 | [diff] [blame] | 987 | kfree(fp); |
Pavel Emelyanov | 309dd5f | 2007-10-17 21:21:51 -0700 | [diff] [blame] | 988 | } |
| 989 | |
| 990 | static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | { |
| 992 | unsigned int size = sk_filter_len(fp); |
| 993 | |
| 994 | atomic_sub(size, &sk->sk_omem_alloc); |
Pavel Emelyanov | 309dd5f | 2007-10-17 21:21:51 -0700 | [diff] [blame] | 995 | sk_filter_release(fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
| 999 | { |
| 1000 | atomic_inc(&fp->refcnt); |
| 1001 | atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); |
| 1002 | } |
| 1003 | |
| 1004 | /* |
| 1005 | * Socket reference counting postulates. |
| 1006 | * |
| 1007 | * * Each user of socket SHOULD hold a reference count. |
| 1008 | * * Each access point to socket (an hash table bucket, reference from a list, |
| 1009 | * running timer, skb in flight MUST hold a reference count. |
| 1010 | * * When reference count hits 0, it means it will never increase back. |
| 1011 | * * When reference count hits 0, it means that no references from |
| 1012 | * outside exist to this socket and current process on current CPU |
| 1013 | * is last user and may/should destroy this socket. |
| 1014 | * * sk_free is called from any context: process, BH, IRQ. When |
| 1015 | * it is called, socket has no references from outside -> sk_free |
| 1016 | * may release descendant resources allocated by the socket, but |
| 1017 | * to the time when it is called, socket is NOT referenced by any |
| 1018 | * hash tables, lists etc. |
| 1019 | * * Packets, delivered from outside (from network or from another process) |
| 1020 | * and enqueued on receive/error queues SHOULD NOT grab reference count, |
| 1021 | * when they sit in queue. Otherwise, packets will leak to hole, when |
| 1022 | * socket is looked up by one cpu and unhasing is made by another CPU. |
| 1023 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp |
| 1024 | * (leak to backlog). Packet socket does all the processing inside |
| 1025 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets |
| 1026 | * use separate SMP lock, so that they are prone too. |
| 1027 | */ |
| 1028 | |
| 1029 | /* Ungrab socket and destroy it, if it was the last reference. */ |
| 1030 | static inline void sock_put(struct sock *sk) |
| 1031 | { |
| 1032 | if (atomic_dec_and_test(&sk->sk_refcnt)) |
| 1033 | sk_free(sk); |
| 1034 | } |
| 1035 | |
Arnaldo Carvalho de Melo | 58a5a7b | 2006-11-16 14:06:06 -0200 | [diff] [blame] | 1036 | extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
| 1037 | const int nested); |
Arnaldo Carvalho de Melo | 25995ff | 2005-12-27 02:42:22 -0200 | [diff] [blame] | 1038 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | /* Detach socket from process context. |
| 1040 | * Announce socket dead, detach it from wait queue and inode. |
| 1041 | * Note that parent inode held reference count on this struct sock, |
| 1042 | * we do not release it in this function, because protocol |
| 1043 | * probably wants some additional cleanups or even continuing |
| 1044 | * to work with this socket (TCP). |
| 1045 | */ |
| 1046 | static inline void sock_orphan(struct sock *sk) |
| 1047 | { |
| 1048 | write_lock_bh(&sk->sk_callback_lock); |
| 1049 | sock_set_flag(sk, SOCK_DEAD); |
| 1050 | sk->sk_socket = NULL; |
| 1051 | sk->sk_sleep = NULL; |
| 1052 | write_unlock_bh(&sk->sk_callback_lock); |
| 1053 | } |
| 1054 | |
| 1055 | static inline void sock_graft(struct sock *sk, struct socket *parent) |
| 1056 | { |
| 1057 | write_lock_bh(&sk->sk_callback_lock); |
| 1058 | sk->sk_sleep = &parent->wait; |
| 1059 | parent->sk = sk; |
| 1060 | sk->sk_socket = parent; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 1061 | security_sock_graft(sk, parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | write_unlock_bh(&sk->sk_callback_lock); |
| 1063 | } |
| 1064 | |
| 1065 | extern int sock_i_uid(struct sock *sk); |
| 1066 | extern unsigned long sock_i_ino(struct sock *sk); |
| 1067 | |
| 1068 | static inline struct dst_entry * |
| 1069 | __sk_dst_get(struct sock *sk) |
| 1070 | { |
| 1071 | return sk->sk_dst_cache; |
| 1072 | } |
| 1073 | |
| 1074 | static inline struct dst_entry * |
| 1075 | sk_dst_get(struct sock *sk) |
| 1076 | { |
| 1077 | struct dst_entry *dst; |
| 1078 | |
| 1079 | read_lock(&sk->sk_dst_lock); |
| 1080 | dst = sk->sk_dst_cache; |
| 1081 | if (dst) |
| 1082 | dst_hold(dst); |
| 1083 | read_unlock(&sk->sk_dst_lock); |
| 1084 | return dst; |
| 1085 | } |
| 1086 | |
| 1087 | static inline void |
| 1088 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) |
| 1089 | { |
| 1090 | struct dst_entry *old_dst; |
| 1091 | |
| 1092 | old_dst = sk->sk_dst_cache; |
| 1093 | sk->sk_dst_cache = dst; |
| 1094 | dst_release(old_dst); |
| 1095 | } |
| 1096 | |
| 1097 | static inline void |
| 1098 | sk_dst_set(struct sock *sk, struct dst_entry *dst) |
| 1099 | { |
| 1100 | write_lock(&sk->sk_dst_lock); |
| 1101 | __sk_dst_set(sk, dst); |
| 1102 | write_unlock(&sk->sk_dst_lock); |
| 1103 | } |
| 1104 | |
| 1105 | static inline void |
| 1106 | __sk_dst_reset(struct sock *sk) |
| 1107 | { |
| 1108 | struct dst_entry *old_dst; |
| 1109 | |
| 1110 | old_dst = sk->sk_dst_cache; |
| 1111 | sk->sk_dst_cache = NULL; |
| 1112 | dst_release(old_dst); |
| 1113 | } |
| 1114 | |
| 1115 | static inline void |
| 1116 | sk_dst_reset(struct sock *sk) |
| 1117 | { |
| 1118 | write_lock(&sk->sk_dst_lock); |
| 1119 | __sk_dst_reset(sk); |
| 1120 | write_unlock(&sk->sk_dst_lock); |
| 1121 | } |
| 1122 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 1123 | extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 1125 | extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 1127 | static inline int sk_can_gso(const struct sock *sk) |
| 1128 | { |
| 1129 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); |
| 1130 | } |
| 1131 | |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1132 | extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); |
Arnaldo Carvalho de Melo | 6cbb0df | 2005-08-09 19:49:02 -0700 | [diff] [blame] | 1133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | static inline int skb_copy_to_page(struct sock *sk, char __user *from, |
| 1135 | struct sk_buff *skb, struct page *page, |
| 1136 | int off, int copy) |
| 1137 | { |
| 1138 | if (skb->ip_summed == CHECKSUM_NONE) { |
| 1139 | int err = 0; |
Al Viro | 5084205 | 2006-11-14 21:36:34 -0800 | [diff] [blame] | 1140 | __wsum csum = csum_and_copy_from_user(from, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | page_address(page) + off, |
| 1142 | copy, 0, &err); |
| 1143 | if (err) |
| 1144 | return err; |
| 1145 | skb->csum = csum_block_add(skb->csum, csum, skb->len); |
| 1146 | } else if (copy_from_user(page_address(page) + off, from, copy)) |
| 1147 | return -EFAULT; |
| 1148 | |
| 1149 | skb->len += copy; |
| 1150 | skb->data_len += copy; |
| 1151 | skb->truesize += copy; |
| 1152 | sk->sk_wmem_queued += copy; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1153 | sk_mem_charge(sk, copy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | return 0; |
| 1155 | } |
| 1156 | |
| 1157 | /* |
| 1158 | * Queue a received datagram if it will fit. Stream and sequenced |
| 1159 | * protocols can't normally use this as they need to fit buffers in |
| 1160 | * and play with them. |
| 1161 | * |
| 1162 | * Inlined as it's very short and called for pretty much every |
| 1163 | * packet ever received. |
| 1164 | */ |
| 1165 | |
| 1166 | static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
| 1167 | { |
| 1168 | sock_hold(sk); |
| 1169 | skb->sk = sk; |
| 1170 | skb->destructor = sock_wfree; |
| 1171 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
| 1172 | } |
| 1173 | |
| 1174 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
| 1175 | { |
| 1176 | skb->sk = sk; |
| 1177 | skb->destructor = sock_rfree; |
| 1178 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1179 | sk_mem_charge(sk, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | } |
| 1181 | |
| 1182 | extern void sk_reset_timer(struct sock *sk, struct timer_list* timer, |
| 1183 | unsigned long expires); |
| 1184 | |
| 1185 | extern void sk_stop_timer(struct sock *sk, struct timer_list* timer); |
| 1186 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 1187 | extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | |
| 1189 | static inline int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb) |
| 1190 | { |
| 1191 | /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces |
| 1192 | number of warnings when compiling with -W --ANK |
| 1193 | */ |
| 1194 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= |
| 1195 | (unsigned)sk->sk_rcvbuf) |
| 1196 | return -ENOMEM; |
| 1197 | skb_set_owner_r(skb, sk); |
| 1198 | skb_queue_tail(&sk->sk_error_queue, skb); |
| 1199 | if (!sock_flag(sk, SOCK_DEAD)) |
| 1200 | sk->sk_data_ready(sk, skb->len); |
| 1201 | return 0; |
| 1202 | } |
| 1203 | |
| 1204 | /* |
| 1205 | * Recover an error report and clear atomically |
| 1206 | */ |
| 1207 | |
| 1208 | static inline int sock_error(struct sock *sk) |
| 1209 | { |
Benjamin LaHaise | c1cbe4b | 2005-12-13 23:22:19 -0800 | [diff] [blame] | 1210 | int err; |
| 1211 | if (likely(!sk->sk_err)) |
| 1212 | return 0; |
| 1213 | err = xchg(&sk->sk_err, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | return -err; |
| 1215 | } |
| 1216 | |
| 1217 | static inline unsigned long sock_wspace(struct sock *sk) |
| 1218 | { |
| 1219 | int amt = 0; |
| 1220 | |
| 1221 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| 1222 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); |
| 1223 | if (amt < 0) |
| 1224 | amt = 0; |
| 1225 | } |
| 1226 | return amt; |
| 1227 | } |
| 1228 | |
| 1229 | static inline void sk_wake_async(struct sock *sk, int how, int band) |
| 1230 | { |
| 1231 | if (sk->sk_socket && sk->sk_socket->fasync_list) |
| 1232 | sock_wake_async(sk->sk_socket, how, band); |
| 1233 | } |
| 1234 | |
| 1235 | #define SOCK_MIN_SNDBUF 2048 |
| 1236 | #define SOCK_MIN_RCVBUF 256 |
| 1237 | |
| 1238 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) |
| 1239 | { |
| 1240 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { |
Eric Dumazet | 8df09ea | 2007-12-21 03:07:41 -0800 | [diff] [blame] | 1241 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
| 1243 | } |
| 1244 | } |
| 1245 | |
Pavel Emelyanov | df97c70 | 2007-11-29 21:22:33 +1100 | [diff] [blame] | 1246 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | |
| 1248 | static inline struct page *sk_stream_alloc_page(struct sock *sk) |
| 1249 | { |
| 1250 | struct page *page = NULL; |
| 1251 | |
Herbert Xu | ef01578 | 2005-09-01 17:48:59 -0700 | [diff] [blame] | 1252 | page = alloc_pages(sk->sk_allocation, 0); |
| 1253 | if (!page) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | sk->sk_prot->enter_memory_pressure(); |
| 1255 | sk_stream_moderate_sndbuf(sk); |
| 1256 | } |
| 1257 | return page; |
| 1258 | } |
| 1259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | /* |
| 1261 | * Default write policy as shown to user space via poll/select/SIGIO |
| 1262 | */ |
| 1263 | static inline int sock_writeable(const struct sock *sk) |
| 1264 | { |
Eric Dumazet | 8df09ea | 2007-12-21 03:07:41 -0800 | [diff] [blame] | 1265 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | } |
| 1267 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1268 | static inline gfp_t gfp_any(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | { |
Patrick McHardy | 4498121 | 2007-02-27 09:56:42 -0800 | [diff] [blame] | 1270 | return in_atomic() ? GFP_ATOMIC : GFP_KERNEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | } |
| 1272 | |
| 1273 | static inline long sock_rcvtimeo(const struct sock *sk, int noblock) |
| 1274 | { |
| 1275 | return noblock ? 0 : sk->sk_rcvtimeo; |
| 1276 | } |
| 1277 | |
| 1278 | static inline long sock_sndtimeo(const struct sock *sk, int noblock) |
| 1279 | { |
| 1280 | return noblock ? 0 : sk->sk_sndtimeo; |
| 1281 | } |
| 1282 | |
| 1283 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) |
| 1284 | { |
| 1285 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; |
| 1286 | } |
| 1287 | |
| 1288 | /* Alas, with timeout socket operations are not restartable. |
| 1289 | * Compare this to poll(). |
| 1290 | */ |
| 1291 | static inline int sock_intr_errno(long timeo) |
| 1292 | { |
| 1293 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; |
| 1294 | } |
| 1295 | |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 1296 | extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
| 1297 | struct sk_buff *skb); |
| 1298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | static __inline__ void |
| 1300 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) |
| 1301 | { |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1302 | ktime_t kt = skb->tstamp; |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1303 | |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 1304 | if (sock_flag(sk, SOCK_RCVTSTAMP)) |
| 1305 | __sock_recv_timestamp(msg, sk, skb); |
| 1306 | else |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1307 | sk->sk_stamp = kt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | } |
| 1309 | |
| 1310 | /** |
| 1311 | * sk_eat_skb - Release a skb if it is no longer needed |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1312 | * @sk: socket to eat this skb from |
| 1313 | * @skb: socket buffer to eat |
Randy Dunlap | f4b8ea7 | 2006-06-22 16:00:11 -0700 | [diff] [blame] | 1314 | * @copied_early: flag indicating whether DMA operations copied this data early |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | * |
| 1316 | * This routine must be called with interrupts disabled or with the socket |
| 1317 | * locked so that the sk_buff queue operation is ok. |
| 1318 | */ |
Chris Leech | 624d116 | 2006-05-23 18:01:28 -0700 | [diff] [blame] | 1319 | #ifdef CONFIG_NET_DMA |
| 1320 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) |
| 1321 | { |
| 1322 | __skb_unlink(skb, &sk->sk_receive_queue); |
| 1323 | if (!copied_early) |
| 1324 | __kfree_skb(skb); |
| 1325 | else |
| 1326 | __skb_queue_tail(&sk->sk_async_wait_queue, skb); |
| 1327 | } |
| 1328 | #else |
| 1329 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | { |
| 1331 | __skb_unlink(skb, &sk->sk_receive_queue); |
| 1332 | __kfree_skb(skb); |
| 1333 | } |
Chris Leech | 624d116 | 2006-05-23 18:01:28 -0700 | [diff] [blame] | 1334 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | |
| 1336 | extern void sock_enable_timestamp(struct sock *sk); |
| 1337 | extern int sock_get_timestamp(struct sock *, struct timeval __user *); |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 1338 | extern int sock_get_timestampns(struct sock *, struct timespec __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | |
| 1340 | /* |
| 1341 | * Enable debug/info messages |
| 1342 | */ |
Stephen Hemminger | a2a316f | 2007-03-08 20:41:08 -0800 | [diff] [blame] | 1343 | extern int net_msg_warn; |
| 1344 | #define NETDEBUG(fmt, args...) \ |
| 1345 | do { if (net_msg_warn) printk(fmt,##args); } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | |
Stephen Hemminger | a2a316f | 2007-03-08 20:41:08 -0800 | [diff] [blame] | 1347 | #define LIMIT_NETDEBUG(fmt, args...) \ |
| 1348 | do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | |
| 1350 | /* |
| 1351 | * Macros for sleeping on a socket. Use them like this: |
| 1352 | * |
| 1353 | * SOCK_SLEEP_PRE(sk) |
| 1354 | * if (condition) |
| 1355 | * schedule(); |
| 1356 | * SOCK_SLEEP_POST(sk) |
| 1357 | * |
| 1358 | * N.B. These are now obsolete and were, afaik, only ever used in DECnet |
| 1359 | * and when the last use of them in DECnet has gone, I'm intending to |
| 1360 | * remove them. |
| 1361 | */ |
| 1362 | |
| 1363 | #define SOCK_SLEEP_PRE(sk) { struct task_struct *tsk = current; \ |
| 1364 | DECLARE_WAITQUEUE(wait, tsk); \ |
| 1365 | tsk->state = TASK_INTERRUPTIBLE; \ |
| 1366 | add_wait_queue((sk)->sk_sleep, &wait); \ |
| 1367 | release_sock(sk); |
| 1368 | |
| 1369 | #define SOCK_SLEEP_POST(sk) tsk->state = TASK_RUNNING; \ |
| 1370 | remove_wait_queue((sk)->sk_sleep, &wait); \ |
| 1371 | lock_sock(sk); \ |
| 1372 | } |
| 1373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | extern __u32 sysctl_wmem_max; |
| 1375 | extern __u32 sysctl_rmem_max; |
| 1376 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1377 | extern void sk_init(void); |
| 1378 | |
David S. Miller | 6baf1f4 | 2005-09-05 18:14:11 -0700 | [diff] [blame] | 1379 | extern int sysctl_optmem_max; |
| 1380 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1381 | extern __u32 sysctl_wmem_default; |
| 1382 | extern __u32 sysctl_rmem_default; |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | #endif /* _SOCK_H */ |