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 | |
Alexey Dobriyan | a6b7a40 | 2011-06-06 10:43:46 +0000 | [diff] [blame] | 43 | #include <linux/hardirq.h> |
Ilpo Järvinen | 172589c | 2007-08-28 15:50:33 -0700 | [diff] [blame] | 44 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <linux/list.h> |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 46 | #include <linux/list_nulls.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/timer.h> |
| 48 | #include <linux/cache.h> |
| 49 | #include <linux/module.h> |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 50 | #include <linux/lockdep.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <linux/netdevice.h> |
| 52 | #include <linux/skbuff.h> /* struct sk_buff */ |
Al Viro | d7fe0f2 | 2006-12-03 23:15:30 -0500 | [diff] [blame] | 53 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include <linux/security.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 55 | #include <linux/slab.h> |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 56 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | #include <linux/filter.h> |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 59 | #include <linux/rculist_nulls.h> |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 60 | #include <linux/poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
Eric Dumazet | c31504d | 2010-11-15 19:58:26 +0000 | [diff] [blame] | 62 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | #include <net/dst.h> |
| 64 | #include <net/checksum.h> |
| 65 | |
| 66 | /* |
| 67 | * This structure really needs to be cleaned up. |
| 68 | * Most of it is for TCP, and not used by any of |
| 69 | * the other protocols. |
| 70 | */ |
| 71 | |
| 72 | /* Define this to get the SOCK_DBG debugging facility. */ |
| 73 | #define SOCK_DEBUGGING |
| 74 | #ifdef SOCK_DEBUGGING |
| 75 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ |
| 76 | printk(KERN_DEBUG msg); } while (0) |
| 77 | #else |
Stephen Hemminger | 4cd9029 | 2008-03-21 15:54:53 -0700 | [diff] [blame] | 78 | /* Validate arguments and do nothing */ |
Jan Engelhardt | 1183f38 | 2010-05-02 13:42:39 -0700 | [diff] [blame] | 79 | static inline void __attribute__ ((format (printf, 2, 3))) |
Stephen Hemminger | 4cd9029 | 2008-03-21 15:54:53 -0700 | [diff] [blame] | 80 | SOCK_DEBUG(struct sock *sk, const char *msg, ...) |
| 81 | { |
| 82 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | #endif |
| 84 | |
| 85 | /* This is the per-socket lock. The spinlock provides a synchronization |
| 86 | * between user contexts and software interrupt processing, whereas the |
| 87 | * mini-semaphore synchronizes multiple users amongst themselves. |
| 88 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | typedef struct { |
| 90 | spinlock_t slock; |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 91 | int owned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | wait_queue_head_t wq; |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 93 | /* |
| 94 | * We express the mutex-alike socket_lock semantics |
| 95 | * to the lock validator by explicitly managing |
| 96 | * the slock as a lock variant (in addition to |
| 97 | * the slock itself): |
| 98 | */ |
| 99 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 100 | struct lockdep_map dep_map; |
| 101 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | } socket_lock_t; |
| 103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | struct sock; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 105 | struct proto; |
Denis V. Lunev | 0eeb8ff | 2007-12-04 01:15:45 -0800 | [diff] [blame] | 106 | struct net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
| 108 | /** |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 109 | * struct sock_common - minimal network layer representation of sockets |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 110 | * @skc_daddr: Foreign IPv4 addr |
| 111 | * @skc_rcv_saddr: Bound local IPv4 addr |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 112 | * @skc_hash: hash value used with various protocol lookup tables |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 113 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 114 | * @skc_family: network address family |
| 115 | * @skc_state: Connection state |
| 116 | * @skc_reuse: %SO_REUSEADDR setting |
| 117 | * @skc_bound_dev_if: bound device index if != 0 |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 118 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 119 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 120 | * @skc_prot: protocol handlers inside a network family |
Eric W. Biederman | 07feaeb | 2007-09-12 11:58:02 +0200 | [diff] [blame] | 121 | * @skc_net: reference to the network namespace of this socket |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 122 | * @skc_node: main hash linkage for various protocol lookup tables |
| 123 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol |
| 124 | * @skc_tx_queue_mapping: tx queue number for this connection |
| 125 | * @skc_refcnt: reference count |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 126 | * |
| 127 | * This is the minimal network layer representation of sockets, the header |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 128 | * for struct sock and struct inet_timewait_sock. |
| 129 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | struct sock_common { |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 131 | /* skc_daddr and skc_rcv_saddr must be grouped : |
| 132 | * cf INET_MATCH() and INET_TW_MATCH() |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 133 | */ |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 134 | __be32 skc_daddr; |
| 135 | __be32 skc_rcv_saddr; |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 136 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 137 | union { |
| 138 | unsigned int skc_hash; |
| 139 | __u16 skc_u16hashes[2]; |
| 140 | }; |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 141 | unsigned short skc_family; |
| 142 | volatile unsigned char skc_state; |
| 143 | unsigned char skc_reuse; |
| 144 | int skc_bound_dev_if; |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 145 | union { |
| 146 | struct hlist_node skc_bind_node; |
| 147 | struct hlist_nulls_node skc_portaddr_node; |
| 148 | }; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 149 | struct proto *skc_prot; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 150 | #ifdef CONFIG_NET_NS |
Eric W. Biederman | 07feaeb | 2007-09-12 11:58:02 +0200 | [diff] [blame] | 151 | struct net *skc_net; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 152 | #endif |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 153 | /* |
| 154 | * fields between dontcopy_begin/dontcopy_end |
| 155 | * are not copied in sock_copy() |
| 156 | */ |
Randy Dunlap | 928c41e | 2011-01-08 17:39:21 +0000 | [diff] [blame] | 157 | /* private: */ |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 158 | int skc_dontcopy_begin[0]; |
Randy Dunlap | 928c41e | 2011-01-08 17:39:21 +0000 | [diff] [blame] | 159 | /* public: */ |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 160 | union { |
| 161 | struct hlist_node skc_node; |
| 162 | struct hlist_nulls_node skc_nulls_node; |
| 163 | }; |
| 164 | int skc_tx_queue_mapping; |
| 165 | atomic_t skc_refcnt; |
Randy Dunlap | 928c41e | 2011-01-08 17:39:21 +0000 | [diff] [blame] | 166 | /* private: */ |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 167 | int skc_dontcopy_end[0]; |
Randy Dunlap | 928c41e | 2011-01-08 17:39:21 +0000 | [diff] [blame] | 168 | /* public: */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | }; |
| 170 | |
| 171 | /** |
| 172 | * struct sock - network layer representation of sockets |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 173 | * @__sk_common: shared layout with inet_timewait_sock |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 174 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
| 175 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings |
| 176 | * @sk_lock: synchronizer |
| 177 | * @sk_rcvbuf: size of receive buffer in bytes |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 178 | * @sk_wq: sock wait queue and async head |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 179 | * @sk_dst_cache: destination cache |
| 180 | * @sk_dst_lock: destination cache lock |
| 181 | * @sk_policy: flow policy |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 182 | * @sk_receive_queue: incoming packets |
| 183 | * @sk_wmem_alloc: transmit queue bytes committed |
| 184 | * @sk_write_queue: Packet sending queue |
Chris Leech | 97fc2f0 | 2006-05-23 17:55:33 -0700 | [diff] [blame] | 185 | * @sk_async_wait_queue: DMA copied packets |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 186 | * @sk_omem_alloc: "o" is "option" or "other" |
| 187 | * @sk_wmem_queued: persistent queue size |
| 188 | * @sk_forward_alloc: space allocated forward |
| 189 | * @sk_allocation: allocation mode |
| 190 | * @sk_sndbuf: size of send buffer in bytes |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 191 | * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 192 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 193 | * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets |
| 194 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 195 | * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 196 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 197 | * @sk_gso_max_size: Maximum GSO segment size to build |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 198 | * @sk_lingertime: %SO_LINGER l_linger setting |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 199 | * @sk_backlog: always used with the per-socket spinlock held |
| 200 | * @sk_callback_lock: used with the callbacks in the end of this struct |
| 201 | * @sk_error_queue: rarely used |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 202 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
| 203 | * IPV6_ADDRFORM for instance) |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 204 | * @sk_err: last error |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 205 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
| 206 | * persistent failure not just 'timed out' |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 207 | * @sk_drops: raw/udp drops counter |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 208 | * @sk_ack_backlog: current listen backlog |
| 209 | * @sk_max_ack_backlog: listen backlog set in listen() |
| 210 | * @sk_priority: %SO_PRIORITY setting |
| 211 | * @sk_type: socket type (%SOCK_STREAM, etc) |
| 212 | * @sk_protocol: which protocol this socket belongs in this network family |
Randy Dunlap | 53c3fa2 | 2010-08-09 13:41:07 +0000 | [diff] [blame] | 213 | * @sk_peer_pid: &struct pid for this socket's peer |
| 214 | * @sk_peer_cred: %SO_PEERCRED setting |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 215 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
| 216 | * @sk_rcvtimeo: %SO_RCVTIMEO setting |
| 217 | * @sk_sndtimeo: %SO_SNDTIMEO setting |
David S. Miller | c58dc01 | 2010-04-27 15:05:31 -0700 | [diff] [blame] | 218 | * @sk_rxhash: flow hash received from netif layer |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 219 | * @sk_filter: socket filtering instructions |
| 220 | * @sk_protinfo: private area, net family specific, when not using slab |
| 221 | * @sk_timer: sock cleanup timer |
| 222 | * @sk_stamp: time stamp of last packet received |
| 223 | * @sk_socket: Identd and reporting IO signals |
| 224 | * @sk_user_data: RPC layer private data |
| 225 | * @sk_sndmsg_page: cached page for sendmsg |
| 226 | * @sk_sndmsg_off: cached offset for sendmsg |
| 227 | * @sk_send_head: front of stuff to transmit |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 228 | * @sk_security: used by security modules |
Randy Dunlap | 3172936 | 2008-02-18 20:52:13 -0800 | [diff] [blame] | 229 | * @sk_mark: generic packet mark |
Randy Dunlap | 53c3fa2 | 2010-08-09 13:41:07 +0000 | [diff] [blame] | 230 | * @sk_classid: this socket's cgroup classid |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 231 | * @sk_write_pending: a write to stream socket waits to start |
| 232 | * @sk_state_change: callback to indicate change in the state of the sock |
| 233 | * @sk_data_ready: callback to indicate there is data to be processed |
| 234 | * @sk_write_space: callback to indicate there is bf sending space available |
| 235 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) |
| 236 | * @sk_backlog_rcv: callback to process the backlog |
| 237 | * @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] | 238 | */ |
| 239 | struct sock { |
| 240 | /* |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 241 | * Now struct inet_timewait_sock also uses sock_common, so please just |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | * don't add nothing before this first member (__sk_common) --acme |
| 243 | */ |
| 244 | struct sock_common __sk_common; |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 245 | #define sk_node __sk_common.skc_node |
| 246 | #define sk_nulls_node __sk_common.skc_nulls_node |
| 247 | #define sk_refcnt __sk_common.skc_refcnt |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 248 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 249 | |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 250 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin |
| 251 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 252 | #define sk_hash __sk_common.skc_hash |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | #define sk_family __sk_common.skc_family |
| 254 | #define sk_state __sk_common.skc_state |
| 255 | #define sk_reuse __sk_common.skc_reuse |
| 256 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | #define sk_bind_node __sk_common.skc_bind_node |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 258 | #define sk_prot __sk_common.skc_prot |
Eric W. Biederman | 07feaeb | 2007-09-12 11:58:02 +0200 | [diff] [blame] | 259 | #define sk_net __sk_common.skc_net |
Eric Dumazet | b178bb3 | 2010-11-16 05:56:04 +0000 | [diff] [blame] | 260 | socket_lock_t sk_lock; |
| 261 | struct sk_buff_head sk_receive_queue; |
| 262 | /* |
| 263 | * The backlog queue is special, it is always used with |
| 264 | * the per-socket spinlock held and requires low latency |
| 265 | * access. Therefore we special case it's implementation. |
| 266 | * Note : rmem_alloc is in this structure to fill a hole |
| 267 | * on 64bit arches, not because its logically part of |
| 268 | * backlog. |
| 269 | */ |
| 270 | struct { |
| 271 | atomic_t rmem_alloc; |
| 272 | int len; |
| 273 | struct sk_buff *head; |
| 274 | struct sk_buff *tail; |
| 275 | } sk_backlog; |
| 276 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
| 277 | int sk_forward_alloc; |
| 278 | #ifdef CONFIG_RPS |
| 279 | __u32 sk_rxhash; |
| 280 | #endif |
| 281 | atomic_t sk_drops; |
| 282 | int sk_rcvbuf; |
| 283 | |
| 284 | struct sk_filter __rcu *sk_filter; |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 285 | struct socket_wq __rcu *sk_wq; |
Eric Dumazet | b178bb3 | 2010-11-16 05:56:04 +0000 | [diff] [blame] | 286 | |
| 287 | #ifdef CONFIG_NET_DMA |
| 288 | struct sk_buff_head sk_async_wait_queue; |
| 289 | #endif |
| 290 | |
| 291 | #ifdef CONFIG_XFRM |
| 292 | struct xfrm_policy *sk_policy[2]; |
| 293 | #endif |
| 294 | unsigned long sk_flags; |
| 295 | struct dst_entry *sk_dst_cache; |
| 296 | spinlock_t sk_dst_lock; |
| 297 | atomic_t sk_wmem_alloc; |
| 298 | atomic_t sk_omem_alloc; |
| 299 | int sk_sndbuf; |
| 300 | struct sk_buff_head sk_write_queue; |
Vegard Nossum | a98b65a | 2009-02-26 14:46:57 +0100 | [diff] [blame] | 301 | kmemcheck_bitfield_begin(flags); |
Eric Dumazet | 5fdb997 | 2009-10-08 22:50:25 +0000 | [diff] [blame] | 302 | unsigned int sk_shutdown : 2, |
| 303 | sk_no_check : 2, |
| 304 | sk_userlocks : 4, |
| 305 | sk_protocol : 8, |
| 306 | sk_type : 16; |
Vegard Nossum | a98b65a | 2009-02-26 14:46:57 +0100 | [diff] [blame] | 307 | kmemcheck_bitfield_end(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | int sk_wmem_queued; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 309 | gfp_t sk_allocation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | int sk_route_caps; |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 311 | int sk_route_nocaps; |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 312 | int sk_gso_type; |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 313 | unsigned int sk_gso_max_size; |
David S. Miller | 9932cf9 | 2006-03-24 15:12:37 -0800 | [diff] [blame] | 314 | int sk_rcvlowat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | unsigned long sk_lingertime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | struct sk_buff_head sk_error_queue; |
Arnaldo Carvalho de Melo | 476e19c | 2005-05-05 13:35:15 -0700 | [diff] [blame] | 317 | struct proto *sk_prot_creator; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | rwlock_t sk_callback_lock; |
| 319 | int sk_err, |
| 320 | sk_err_soft; |
| 321 | unsigned short sk_ack_backlog; |
| 322 | unsigned short sk_max_ack_backlog; |
| 323 | __u32 sk_priority; |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 324 | struct pid *sk_peer_pid; |
| 325 | const struct cred *sk_peer_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | long sk_rcvtimeo; |
| 327 | long sk_sndtimeo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | void *sk_protinfo; |
| 329 | struct timer_list sk_timer; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 330 | ktime_t sk_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | struct socket *sk_socket; |
| 332 | void *sk_user_data; |
| 333 | struct page *sk_sndmsg_page; |
| 334 | struct sk_buff *sk_send_head; |
| 335 | __u32 sk_sndmsg_off; |
| 336 | int sk_write_pending; |
Alexey Dobriyan | d5f6423 | 2008-11-04 14:45:58 -0800 | [diff] [blame] | 337 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | void *sk_security; |
Alexey Dobriyan | d5f6423 | 2008-11-04 14:45:58 -0800 | [diff] [blame] | 339 | #endif |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 340 | __u32 sk_mark; |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 341 | u32 sk_classid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | void (*sk_state_change)(struct sock *sk); |
| 343 | void (*sk_data_ready)(struct sock *sk, int bytes); |
| 344 | void (*sk_write_space)(struct sock *sk); |
| 345 | void (*sk_error_report)(struct sock *sk); |
| 346 | int (*sk_backlog_rcv)(struct sock *sk, |
| 347 | struct sk_buff *skb); |
| 348 | void (*sk_destruct)(struct sock *sk); |
| 349 | }; |
| 350 | |
| 351 | /* |
| 352 | * Hashed lists helper routines |
| 353 | */ |
Li Zefan | c414664 | 2010-02-08 23:18:45 +0000 | [diff] [blame] | 354 | static inline struct sock *sk_entry(const struct hlist_node *node) |
| 355 | { |
| 356 | return hlist_entry(node, struct sock, sk_node); |
| 357 | } |
| 358 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 359 | static inline struct sock *__sk_head(const struct hlist_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
| 361 | return hlist_entry(head->first, struct sock, sk_node); |
| 362 | } |
| 363 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 364 | static inline struct sock *sk_head(const struct hlist_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | { |
| 366 | return hlist_empty(head) ? NULL : __sk_head(head); |
| 367 | } |
| 368 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 369 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
| 370 | { |
| 371 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); |
| 372 | } |
| 373 | |
| 374 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) |
| 375 | { |
| 376 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); |
| 377 | } |
| 378 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 379 | static inline struct sock *sk_next(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | { |
| 381 | return sk->sk_node.next ? |
| 382 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; |
| 383 | } |
| 384 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 385 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
| 386 | { |
| 387 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? |
| 388 | hlist_nulls_entry(sk->sk_nulls_node.next, |
| 389 | struct sock, sk_nulls_node) : |
| 390 | NULL; |
| 391 | } |
| 392 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 393 | static inline int sk_unhashed(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | { |
| 395 | return hlist_unhashed(&sk->sk_node); |
| 396 | } |
| 397 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 398 | static inline int sk_hashed(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
Akinobu Mita | da753be | 2006-04-28 15:21:23 -0700 | [diff] [blame] | 400 | return !sk_unhashed(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | static __inline__ void sk_node_init(struct hlist_node *node) |
| 404 | { |
| 405 | node->pprev = NULL; |
| 406 | } |
| 407 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 408 | static __inline__ void sk_nulls_node_init(struct hlist_nulls_node *node) |
| 409 | { |
| 410 | node->pprev = NULL; |
| 411 | } |
| 412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | static __inline__ void __sk_del_node(struct sock *sk) |
| 414 | { |
| 415 | __hlist_del(&sk->sk_node); |
| 416 | } |
| 417 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 418 | /* NB: equivalent to hlist_del_init_rcu */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | static __inline__ int __sk_del_node_init(struct sock *sk) |
| 420 | { |
| 421 | if (sk_hashed(sk)) { |
| 422 | __sk_del_node(sk); |
| 423 | sk_node_init(&sk->sk_node); |
| 424 | return 1; |
| 425 | } |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | /* Grab socket reference count. This operation is valid only |
| 430 | when sk is ALREADY grabbed f.e. it is found in hash table |
| 431 | or a list and the lookup is made under lock preventing hash table |
| 432 | modifications. |
| 433 | */ |
| 434 | |
| 435 | static inline void sock_hold(struct sock *sk) |
| 436 | { |
| 437 | atomic_inc(&sk->sk_refcnt); |
| 438 | } |
| 439 | |
| 440 | /* Ungrab socket in the context, which assumes that socket refcnt |
| 441 | cannot hit zero, f.e. it is true in context of any socketcall. |
| 442 | */ |
| 443 | static inline void __sock_put(struct sock *sk) |
| 444 | { |
| 445 | atomic_dec(&sk->sk_refcnt); |
| 446 | } |
| 447 | |
| 448 | static __inline__ int sk_del_node_init(struct sock *sk) |
| 449 | { |
| 450 | int rc = __sk_del_node_init(sk); |
| 451 | |
| 452 | if (rc) { |
| 453 | /* paranoid for a while -acme */ |
| 454 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); |
| 455 | __sock_put(sk); |
| 456 | } |
| 457 | return rc; |
| 458 | } |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 459 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 461 | static __inline__ int __sk_nulls_del_node_init_rcu(struct sock *sk) |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 462 | { |
| 463 | if (sk_hashed(sk)) { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 464 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 465 | return 1; |
| 466 | } |
| 467 | return 0; |
| 468 | } |
| 469 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 470 | static __inline__ int sk_nulls_del_node_init_rcu(struct sock *sk) |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 471 | { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 472 | int rc = __sk_nulls_del_node_init_rcu(sk); |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 473 | |
| 474 | if (rc) { |
| 475 | /* paranoid for a while -acme */ |
| 476 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); |
| 477 | __sock_put(sk); |
| 478 | } |
| 479 | return rc; |
| 480 | } |
| 481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list) |
| 483 | { |
| 484 | hlist_add_head(&sk->sk_node, list); |
| 485 | } |
| 486 | |
| 487 | static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list) |
| 488 | { |
| 489 | sock_hold(sk); |
| 490 | __sk_add_node(sk, list); |
| 491 | } |
| 492 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 493 | static __inline__ void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
| 494 | { |
| 495 | sock_hold(sk); |
| 496 | hlist_add_head_rcu(&sk->sk_node, list); |
| 497 | } |
| 498 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 499 | static __inline__ void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 500 | { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 501 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 502 | } |
| 503 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 504 | static __inline__ void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 505 | { |
| 506 | sock_hold(sk); |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 507 | __sk_nulls_add_node_rcu(sk, list); |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 508 | } |
| 509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | static __inline__ void __sk_del_bind_node(struct sock *sk) |
| 511 | { |
| 512 | __hlist_del(&sk->sk_bind_node); |
| 513 | } |
| 514 | |
| 515 | static __inline__ void sk_add_bind_node(struct sock *sk, |
| 516 | struct hlist_head *list) |
| 517 | { |
| 518 | hlist_add_head(&sk->sk_bind_node, list); |
| 519 | } |
| 520 | |
| 521 | #define sk_for_each(__sk, node, list) \ |
| 522 | hlist_for_each_entry(__sk, node, list, sk_node) |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 523 | #define sk_for_each_rcu(__sk, node, list) \ |
| 524 | hlist_for_each_entry_rcu(__sk, node, list, sk_node) |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 525 | #define sk_nulls_for_each(__sk, node, list) \ |
| 526 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) |
| 527 | #define sk_nulls_for_each_rcu(__sk, node, list) \ |
| 528 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | #define sk_for_each_from(__sk, node) \ |
| 530 | if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ |
| 531 | hlist_for_each_entry_from(__sk, node, sk_node) |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 532 | #define sk_nulls_for_each_from(__sk, node) \ |
| 533 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ |
| 534 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | #define sk_for_each_safe(__sk, node, tmp, list) \ |
| 536 | hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node) |
| 537 | #define sk_for_each_bound(__sk, node, list) \ |
| 538 | hlist_for_each_entry(__sk, node, list, sk_bind_node) |
| 539 | |
| 540 | /* Sock flags */ |
| 541 | enum sock_flags { |
| 542 | SOCK_DEAD, |
| 543 | SOCK_DONE, |
| 544 | SOCK_URGINLINE, |
| 545 | SOCK_KEEPOPEN, |
| 546 | SOCK_LINGER, |
| 547 | SOCK_DESTROY, |
| 548 | SOCK_BROADCAST, |
| 549 | SOCK_TIMESTAMP, |
| 550 | SOCK_ZAPPED, |
| 551 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ |
| 552 | SOCK_DBG, /* %SO_DEBUG setting */ |
| 553 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 554 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
| 556 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 557 | SOCK_TIMESTAMPING_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */ |
| 558 | SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */ |
| 559 | SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */ |
| 560 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ |
| 561 | SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */ |
| 562 | SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */ |
| 563 | SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */ |
Eric Dumazet | bcdce71 | 2009-10-06 17:28:29 -0700 | [diff] [blame] | 564 | SOCK_FASYNC, /* fasync() active */ |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 565 | SOCK_RXQ_OVFL, |
Shirley Ma | 1cdebb4 | 2011-07-06 12:17:30 +0000 | [diff] [blame] | 566 | SOCK_ZEROCOPY, /* buffers from userspace */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | }; |
| 568 | |
Ralf Baechle | 53b924b | 2005-08-23 10:11:30 -0700 | [diff] [blame] | 569 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
| 570 | { |
| 571 | nsk->sk_flags = osk->sk_flags; |
| 572 | } |
| 573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
| 575 | { |
| 576 | __set_bit(flag, &sk->sk_flags); |
| 577 | } |
| 578 | |
| 579 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) |
| 580 | { |
| 581 | __clear_bit(flag, &sk->sk_flags); |
| 582 | } |
| 583 | |
| 584 | static inline int sock_flag(struct sock *sk, enum sock_flags flag) |
| 585 | { |
| 586 | return test_bit(flag, &sk->sk_flags); |
| 587 | } |
| 588 | |
| 589 | static inline void sk_acceptq_removed(struct sock *sk) |
| 590 | { |
| 591 | sk->sk_ack_backlog--; |
| 592 | } |
| 593 | |
| 594 | static inline void sk_acceptq_added(struct sock *sk) |
| 595 | { |
| 596 | sk->sk_ack_backlog++; |
| 597 | } |
| 598 | |
| 599 | static inline int sk_acceptq_is_full(struct sock *sk) |
| 600 | { |
David S. Miller | 64a1465 | 2007-03-06 11:21:05 -0800 | [diff] [blame] | 601 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Compute minimal free write space needed to queue new packets. |
| 606 | */ |
| 607 | static inline int sk_stream_min_wspace(struct sock *sk) |
| 608 | { |
Eric Dumazet | 8df09ea | 2007-12-21 03:07:41 -0800 | [diff] [blame] | 609 | return sk->sk_wmem_queued >> 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | } |
| 611 | |
| 612 | static inline int sk_stream_wspace(struct sock *sk) |
| 613 | { |
| 614 | return sk->sk_sndbuf - sk->sk_wmem_queued; |
| 615 | } |
| 616 | |
| 617 | extern void sk_stream_write_space(struct sock *sk); |
| 618 | |
| 619 | static inline int sk_stream_memory_free(struct sock *sk) |
| 620 | { |
| 621 | return sk->sk_wmem_queued < sk->sk_sndbuf; |
| 622 | } |
| 623 | |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 624 | /* OOB backlog add */ |
Zhu Yi | a3a858f | 2010-03-04 18:01:47 +0000 | [diff] [blame] | 625 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
Stephen Hemminger | 9ee6b53 | 2005-11-08 09:39:42 -0800 | [diff] [blame] | 626 | { |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 627 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
| 628 | skb_dst_force(skb); |
| 629 | |
| 630 | if (!sk->sk_backlog.tail) |
| 631 | sk->sk_backlog.head = skb; |
| 632 | else |
Stephen Hemminger | 9ee6b53 | 2005-11-08 09:39:42 -0800 | [diff] [blame] | 633 | sk->sk_backlog.tail->next = skb; |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 634 | |
| 635 | sk->sk_backlog.tail = skb; |
Stephen Hemminger | 9ee6b53 | 2005-11-08 09:39:42 -0800 | [diff] [blame] | 636 | skb->next = NULL; |
| 637 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 639 | /* |
| 640 | * Take into account size of receive queue and backlog queue |
| 641 | */ |
| 642 | static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb) |
| 643 | { |
| 644 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); |
| 645 | |
| 646 | return qsize + skb->truesize > sk->sk_rcvbuf; |
| 647 | } |
| 648 | |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 649 | /* The per-socket spinlock must be held here. */ |
Zhu Yi | 4045635 | 2010-03-07 16:21:39 +0000 | [diff] [blame] | 650 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb) |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 651 | { |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 652 | if (sk_rcvqueues_full(sk, skb)) |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 653 | return -ENOBUFS; |
| 654 | |
Zhu Yi | a3a858f | 2010-03-04 18:01:47 +0000 | [diff] [blame] | 655 | __sk_add_backlog(sk, skb); |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 656 | sk->sk_backlog.len += skb->truesize; |
| 657 | return 0; |
| 658 | } |
| 659 | |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 660 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
| 661 | { |
| 662 | return sk->sk_backlog_rcv(sk, skb); |
| 663 | } |
| 664 | |
David S. Miller | c58dc01 | 2010-04-27 15:05:31 -0700 | [diff] [blame] | 665 | static inline void sock_rps_record_flow(const struct sock *sk) |
| 666 | { |
| 667 | #ifdef CONFIG_RPS |
| 668 | struct rps_sock_flow_table *sock_flow_table; |
| 669 | |
| 670 | rcu_read_lock(); |
| 671 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
| 672 | rps_record_sock_flow(sock_flow_table, sk->sk_rxhash); |
| 673 | rcu_read_unlock(); |
| 674 | #endif |
| 675 | } |
| 676 | |
| 677 | static inline void sock_rps_reset_flow(const struct sock *sk) |
| 678 | { |
| 679 | #ifdef CONFIG_RPS |
| 680 | struct rps_sock_flow_table *sock_flow_table; |
| 681 | |
| 682 | rcu_read_lock(); |
| 683 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
| 684 | rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash); |
| 685 | rcu_read_unlock(); |
| 686 | #endif |
| 687 | } |
| 688 | |
| 689 | static inline void sock_rps_save_rxhash(struct sock *sk, u32 rxhash) |
| 690 | { |
| 691 | #ifdef CONFIG_RPS |
| 692 | if (unlikely(sk->sk_rxhash != rxhash)) { |
| 693 | sock_rps_reset_flow(sk); |
| 694 | sk->sk_rxhash = rxhash; |
| 695 | } |
| 696 | #endif |
| 697 | } |
| 698 | |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 699 | #define sk_wait_event(__sk, __timeo, __condition) \ |
| 700 | ({ int __rc; \ |
| 701 | release_sock(__sk); \ |
| 702 | __rc = __condition; \ |
| 703 | if (!__rc) { \ |
| 704 | *(__timeo) = schedule_timeout(*(__timeo)); \ |
| 705 | } \ |
| 706 | lock_sock(__sk); \ |
| 707 | __rc = __condition; \ |
| 708 | __rc; \ |
| 709 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
| 711 | extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); |
| 712 | extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); |
| 713 | extern void sk_stream_wait_close(struct sock *sk, long timeo_p); |
| 714 | extern int sk_stream_error(struct sock *sk, int flags, int err); |
| 715 | extern void sk_stream_kill_queues(struct sock *sk); |
| 716 | |
| 717 | extern int sk_wait_data(struct sock *sk, long *timeo); |
| 718 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 719 | struct request_sock_ops; |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 720 | struct timewait_sock_ops; |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 721 | struct inet_hashinfo; |
Pavel Emelyanov | fc8717b | 2008-03-22 16:56:51 -0700 | [diff] [blame] | 722 | struct raw_hashinfo; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | /* Networking protocol blocks we attach to sockets. |
| 725 | * socket layer -> transport layer interface |
| 726 | * transport -> network interface is defined by struct inet_proto |
| 727 | */ |
| 728 | struct proto { |
| 729 | void (*close)(struct sock *sk, |
| 730 | long timeout); |
| 731 | int (*connect)(struct sock *sk, |
| 732 | struct sockaddr *uaddr, |
| 733 | int addr_len); |
| 734 | int (*disconnect)(struct sock *sk, int flags); |
| 735 | |
| 736 | struct sock * (*accept) (struct sock *sk, int flags, int *err); |
| 737 | |
| 738 | int (*ioctl)(struct sock *sk, int cmd, |
| 739 | unsigned long arg); |
| 740 | int (*init)(struct sock *sk); |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 741 | void (*destroy)(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | void (*shutdown)(struct sock *sk, int how); |
| 743 | int (*setsockopt)(struct sock *sk, int level, |
| 744 | int optname, char __user *optval, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 745 | unsigned int optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | int (*getsockopt)(struct sock *sk, int level, |
| 747 | int optname, char __user *optval, |
| 748 | int __user *option); |
Alexey Dobriyan | af01d53 | 2008-08-28 02:53:51 -0700 | [diff] [blame] | 749 | #ifdef CONFIG_COMPAT |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 750 | int (*compat_setsockopt)(struct sock *sk, |
| 751 | int level, |
| 752 | int optname, char __user *optval, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 753 | unsigned int optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 754 | int (*compat_getsockopt)(struct sock *sk, |
| 755 | int level, |
| 756 | int optname, char __user *optval, |
| 757 | int __user *option); |
Eric W. Biederman | 709b46e | 2011-01-29 16:15:56 +0000 | [diff] [blame] | 758 | int (*compat_ioctl)(struct sock *sk, |
| 759 | unsigned int cmd, unsigned long arg); |
Alexey Dobriyan | af01d53 | 2008-08-28 02:53:51 -0700 | [diff] [blame] | 760 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | int (*sendmsg)(struct kiocb *iocb, struct sock *sk, |
| 762 | struct msghdr *msg, size_t len); |
| 763 | int (*recvmsg)(struct kiocb *iocb, struct sock *sk, |
| 764 | struct msghdr *msg, |
| 765 | size_t len, int noblock, int flags, |
| 766 | int *addr_len); |
| 767 | int (*sendpage)(struct sock *sk, struct page *page, |
| 768 | int offset, size_t size, int flags); |
| 769 | int (*bind)(struct sock *sk, |
| 770 | struct sockaddr *uaddr, int addr_len); |
| 771 | |
| 772 | int (*backlog_rcv) (struct sock *sk, |
| 773 | struct sk_buff *skb); |
| 774 | |
| 775 | /* Keeping track of sk's, looking them up, and port selection methods. */ |
| 776 | void (*hash)(struct sock *sk); |
| 777 | void (*unhash)(struct sock *sk); |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 778 | void (*rehash)(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | int (*get_port)(struct sock *sk, unsigned short snum); |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 780 | void (*clear_sk)(struct sock *sk, int size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
Eric Dumazet | 286ab3d | 2007-11-05 23:38:39 -0800 | [diff] [blame] | 782 | /* Keeping track of sockets in use */ |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 783 | #ifdef CONFIG_PROC_FS |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 784 | unsigned int inuse_idx; |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 785 | #endif |
Arnaldo Carvalho de Melo | ebb53d7 | 2007-11-21 22:08:50 +0800 | [diff] [blame] | 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | /* Memory pressure */ |
Pavel Emelyanov | 5c52ba1 | 2008-07-16 20:28:10 -0700 | [diff] [blame] | 788 | void (*enter_memory_pressure)(struct sock *sk); |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 789 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 790 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | /* |
| 792 | * Pressure flag: try to collapse. |
| 793 | * Technical note: it is used by multiple contexts non atomically. |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 794 | * All the __sk_mem_schedule() is of this nature: accounting |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | * is strict, actions are advisory and have some latency. |
| 796 | */ |
| 797 | int *memory_pressure; |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 798 | long *sysctl_mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | int *sysctl_wmem; |
| 800 | int *sysctl_rmem; |
| 801 | int max_header; |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 802 | bool no_autobind; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 804 | struct kmem_cache *slab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | unsigned int obj_size; |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 806 | int slab_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 808 | struct percpu_counter *orphan_count; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 809 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 810 | struct request_sock_ops *rsk_prot; |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 811 | struct timewait_sock_ops *twsk_prot; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 812 | |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 813 | union { |
| 814 | struct inet_hashinfo *hashinfo; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 815 | struct udp_table *udp_table; |
Pavel Emelyanov | fc8717b | 2008-03-22 16:56:51 -0700 | [diff] [blame] | 816 | struct raw_hashinfo *raw_hash; |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 817 | } h; |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 818 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | struct module *owner; |
| 820 | |
| 821 | char name[32]; |
| 822 | |
| 823 | struct list_head node; |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 824 | #ifdef SOCK_REFCNT_DEBUG |
| 825 | atomic_t socks; |
| 826 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | }; |
| 828 | |
| 829 | extern int proto_register(struct proto *prot, int alloc_slab); |
| 830 | extern void proto_unregister(struct proto *prot); |
| 831 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 832 | #ifdef SOCK_REFCNT_DEBUG |
| 833 | static inline void sk_refcnt_debug_inc(struct sock *sk) |
| 834 | { |
| 835 | atomic_inc(&sk->sk_prot->socks); |
| 836 | } |
| 837 | |
| 838 | static inline void sk_refcnt_debug_dec(struct sock *sk) |
| 839 | { |
| 840 | atomic_dec(&sk->sk_prot->socks); |
| 841 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", |
| 842 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); |
| 843 | } |
| 844 | |
| 845 | static inline void sk_refcnt_debug_release(const struct sock *sk) |
| 846 | { |
| 847 | if (atomic_read(&sk->sk_refcnt) != 1) |
| 848 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", |
| 849 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); |
| 850 | } |
| 851 | #else /* SOCK_REFCNT_DEBUG */ |
| 852 | #define sk_refcnt_debug_inc(sk) do { } while (0) |
| 853 | #define sk_refcnt_debug_dec(sk) do { } while (0) |
| 854 | #define sk_refcnt_debug_release(sk) do { } while (0) |
| 855 | #endif /* SOCK_REFCNT_DEBUG */ |
| 856 | |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 857 | |
| 858 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | /* Called with local bh disabled */ |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 860 | extern void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
| 861 | extern int sock_prot_inuse_get(struct net *net, struct proto *proto); |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 862 | #else |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 863 | static void inline sock_prot_inuse_add(struct net *net, struct proto *prot, |
| 864 | int inc) |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 865 | { |
| 866 | } |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 867 | #endif |
| 868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
Arnaldo Carvalho de Melo | 614c6cb | 2005-08-09 19:47:37 -0700 | [diff] [blame] | 870 | /* With per-bucket locks this operation is not-atomic, so that |
| 871 | * this version is not worse. |
| 872 | */ |
| 873 | static inline void __sk_prot_rehash(struct sock *sk) |
| 874 | { |
| 875 | sk->sk_prot->unhash(sk); |
| 876 | sk->sk_prot->hash(sk); |
| 877 | } |
| 878 | |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 879 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size); |
| 880 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | /* About 10 seconds */ |
| 882 | #define SOCK_DESTROY_TIME (10*HZ) |
| 883 | |
| 884 | /* Sockets 0-1023 can't be bound to unless you are superuser */ |
| 885 | #define PROT_SOCK 1024 |
| 886 | |
| 887 | #define SHUTDOWN_MASK 3 |
| 888 | #define RCV_SHUTDOWN 1 |
| 889 | #define SEND_SHUTDOWN 2 |
| 890 | |
| 891 | #define SOCK_SNDBUF_LOCK 1 |
| 892 | #define SOCK_RCVBUF_LOCK 2 |
| 893 | #define SOCK_BINDADDR_LOCK 4 |
| 894 | #define SOCK_BINDPORT_LOCK 8 |
| 895 | |
| 896 | /* sock_iocb: used to kick off async processing of socket ios */ |
| 897 | struct sock_iocb { |
| 898 | struct list_head list; |
| 899 | |
| 900 | int flags; |
| 901 | int size; |
| 902 | struct socket *sock; |
| 903 | struct sock *sk; |
| 904 | struct scm_cookie *scm; |
| 905 | struct msghdr *msg, async_msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | struct kiocb *kiocb; |
| 907 | }; |
| 908 | |
| 909 | static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) |
| 910 | { |
| 911 | return (struct sock_iocb *)iocb->private; |
| 912 | } |
| 913 | |
| 914 | static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) |
| 915 | { |
| 916 | return si->kiocb; |
| 917 | } |
| 918 | |
| 919 | struct socket_alloc { |
| 920 | struct socket socket; |
| 921 | struct inode vfs_inode; |
| 922 | }; |
| 923 | |
| 924 | static inline struct socket *SOCKET_I(struct inode *inode) |
| 925 | { |
| 926 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; |
| 927 | } |
| 928 | |
| 929 | static inline struct inode *SOCK_INODE(struct socket *socket) |
| 930 | { |
| 931 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; |
| 932 | } |
| 933 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 934 | /* |
| 935 | * Functions for memory accounting |
| 936 | */ |
| 937 | extern int __sk_mem_schedule(struct sock *sk, int size, int kind); |
| 938 | extern void __sk_mem_reclaim(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 940 | #define SK_MEM_QUANTUM ((int)PAGE_SIZE) |
| 941 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) |
| 942 | #define SK_MEM_SEND 0 |
| 943 | #define SK_MEM_RECV 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 945 | static inline int sk_mem_pages(int amt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 947 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | } |
| 949 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 950 | static inline int sk_has_account(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 952 | /* return true if protocol supports memory accounting */ |
| 953 | return !!sk->sk_prot->memory_allocated; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | } |
| 955 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 956 | static inline int sk_wmem_schedule(struct sock *sk, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 958 | if (!sk_has_account(sk)) |
| 959 | return 1; |
Herbert Xu | d80d99d | 2005-09-01 17:48:23 -0700 | [diff] [blame] | 960 | return size <= sk->sk_forward_alloc || |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 961 | __sk_mem_schedule(sk, size, SK_MEM_SEND); |
| 962 | } |
| 963 | |
| 964 | static inline int sk_rmem_schedule(struct sock *sk, int size) |
| 965 | { |
| 966 | if (!sk_has_account(sk)) |
| 967 | return 1; |
| 968 | return size <= sk->sk_forward_alloc || |
| 969 | __sk_mem_schedule(sk, size, SK_MEM_RECV); |
| 970 | } |
| 971 | |
| 972 | static inline void sk_mem_reclaim(struct sock *sk) |
| 973 | { |
| 974 | if (!sk_has_account(sk)) |
| 975 | return; |
| 976 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) |
| 977 | __sk_mem_reclaim(sk); |
| 978 | } |
| 979 | |
David S. Miller | 9993e7d | 2008-01-10 21:56:38 -0800 | [diff] [blame] | 980 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
| 981 | { |
| 982 | if (!sk_has_account(sk)) |
| 983 | return; |
| 984 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) |
| 985 | __sk_mem_reclaim(sk); |
| 986 | } |
| 987 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 988 | static inline void sk_mem_charge(struct sock *sk, int size) |
| 989 | { |
| 990 | if (!sk_has_account(sk)) |
| 991 | return; |
| 992 | sk->sk_forward_alloc -= size; |
| 993 | } |
| 994 | |
| 995 | static inline void sk_mem_uncharge(struct sock *sk, int size) |
| 996 | { |
| 997 | if (!sk_has_account(sk)) |
| 998 | return; |
| 999 | sk->sk_forward_alloc += size; |
| 1000 | } |
| 1001 | |
| 1002 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) |
| 1003 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1004 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
| 1005 | sk->sk_wmem_queued -= skb->truesize; |
| 1006 | sk_mem_uncharge(sk, skb->truesize); |
| 1007 | __kfree_skb(skb); |
Herbert Xu | d80d99d | 2005-09-01 17:48:23 -0700 | [diff] [blame] | 1008 | } |
| 1009 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | /* Used by processes to "lock" a socket state, so that |
| 1011 | * interrupts and bottom half handlers won't change it |
| 1012 | * from under us. It essentially blocks any incoming |
| 1013 | * packets, so that we won't get any new data or any |
| 1014 | * packets that change the state of the socket. |
| 1015 | * |
| 1016 | * While locked, BH processing will add new packets to |
| 1017 | * the backlog queue. This queue is processed by the |
| 1018 | * owner of the socket lock right before it is released. |
| 1019 | * |
| 1020 | * Since ~2.3.5 it is also exclusive sleep lock serializing |
| 1021 | * accesses from user process context. |
| 1022 | */ |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 1023 | #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1025 | /* |
| 1026 | * Macro so as to not evaluate some arguments when |
| 1027 | * lockdep is not enabled. |
| 1028 | * |
| 1029 | * Mark both the sk_lock and the sk_lock.slock as a |
| 1030 | * per-address-family lock class. |
| 1031 | */ |
| 1032 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ |
| 1033 | do { \ |
Ingo Molnar | e8f6fbf | 2008-11-12 01:38:36 +0000 | [diff] [blame] | 1034 | sk->sk_lock.owned = 0; \ |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1035 | init_waitqueue_head(&sk->sk_lock.wq); \ |
| 1036 | spin_lock_init(&(sk)->sk_lock.slock); \ |
| 1037 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ |
| 1038 | sizeof((sk)->sk_lock)); \ |
| 1039 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ |
| 1040 | (skey), (sname)); \ |
| 1041 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ |
| 1042 | } while (0) |
| 1043 | |
Harvey Harrison | 4138093 | 2007-12-12 10:46:51 -0800 | [diff] [blame] | 1044 | extern void lock_sock_nested(struct sock *sk, int subclass); |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 1045 | |
| 1046 | static inline void lock_sock(struct sock *sk) |
| 1047 | { |
| 1048 | lock_sock_nested(sk, 0); |
| 1049 | } |
| 1050 | |
Harvey Harrison | 4138093 | 2007-12-12 10:46:51 -0800 | [diff] [blame] | 1051 | extern void release_sock(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
| 1053 | /* BH context may only use the following locking interface. */ |
| 1054 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) |
Ingo Molnar | c636618 | 2006-07-03 00:25:13 -0700 | [diff] [blame] | 1055 | #define bh_lock_sock_nested(__sk) \ |
| 1056 | spin_lock_nested(&((__sk)->sk_lock.slock), \ |
| 1057 | SINGLE_DEPTH_NESTING) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
| 1059 | |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1060 | extern bool lock_sock_fast(struct sock *sk); |
| 1061 | /** |
| 1062 | * unlock_sock_fast - complement of lock_sock_fast |
| 1063 | * @sk: socket |
| 1064 | * @slow: slow mode |
| 1065 | * |
| 1066 | * fast unlock socket for user context. |
| 1067 | * If slow mode is on, we call regular release_sock() |
| 1068 | */ |
| 1069 | static inline void unlock_sock_fast(struct sock *sk, bool slow) |
Eric Dumazet | 4b0b72f | 2010-04-28 14:35:48 -0700 | [diff] [blame] | 1070 | { |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1071 | if (slow) |
| 1072 | release_sock(sk); |
| 1073 | else |
| 1074 | spin_unlock_bh(&sk->sk_lock.slock); |
Eric Dumazet | 4b0b72f | 2010-04-28 14:35:48 -0700 | [diff] [blame] | 1075 | } |
| 1076 | |
Eric Dumazet | 4b0b72f | 2010-04-28 14:35:48 -0700 | [diff] [blame] | 1077 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 1078 | extern struct sock *sk_alloc(struct net *net, int family, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1079 | gfp_t priority, |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 1080 | struct proto *prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | extern void sk_free(struct sock *sk); |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1082 | extern void sk_release_kernel(struct sock *sk); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1083 | extern struct sock *sk_clone(const struct sock *sk, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1084 | const gfp_t priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | |
| 1086 | extern struct sk_buff *sock_wmalloc(struct sock *sk, |
| 1087 | unsigned long size, int force, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1088 | gfp_t priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | extern struct sk_buff *sock_rmalloc(struct sock *sk, |
| 1090 | unsigned long size, int force, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1091 | gfp_t priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | extern void sock_wfree(struct sk_buff *skb); |
| 1093 | extern void sock_rfree(struct sk_buff *skb); |
| 1094 | |
| 1095 | extern int sock_setsockopt(struct socket *sock, int level, |
| 1096 | int op, char __user *optval, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1097 | unsigned int optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | |
| 1099 | extern int sock_getsockopt(struct socket *sock, int level, |
| 1100 | int op, char __user *optval, |
| 1101 | int __user *optlen); |
| 1102 | extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, |
| 1103 | unsigned long size, |
| 1104 | int noblock, |
| 1105 | int *errcode); |
Herbert Xu | 4cc7f68 | 2009-02-04 16:55:54 -0800 | [diff] [blame] | 1106 | extern struct sk_buff *sock_alloc_send_pskb(struct sock *sk, |
| 1107 | unsigned long header_len, |
| 1108 | unsigned long data_len, |
| 1109 | int noblock, |
| 1110 | int *errcode); |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 1111 | extern void *sock_kmalloc(struct sock *sk, int size, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1112 | gfp_t priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | extern void sock_kfree_s(struct sock *sk, void *mem, int size); |
| 1114 | extern void sk_send_sigurg(struct sock *sk); |
| 1115 | |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1116 | #ifdef CONFIG_CGROUPS |
| 1117 | extern void sock_update_classid(struct sock *sk); |
| 1118 | #else |
| 1119 | static inline void sock_update_classid(struct sock *sk) |
| 1120 | { |
| 1121 | } |
| 1122 | #endif |
| 1123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | /* |
| 1125 | * Functions to fill in entries in struct proto_ops when a protocol |
| 1126 | * does not implement a particular function. |
| 1127 | */ |
| 1128 | extern int sock_no_bind(struct socket *, |
| 1129 | struct sockaddr *, int); |
| 1130 | extern int sock_no_connect(struct socket *, |
| 1131 | struct sockaddr *, int, int); |
| 1132 | extern int sock_no_socketpair(struct socket *, |
| 1133 | struct socket *); |
| 1134 | extern int sock_no_accept(struct socket *, |
| 1135 | struct socket *, int); |
| 1136 | extern int sock_no_getname(struct socket *, |
| 1137 | struct sockaddr *, int *, int); |
| 1138 | extern unsigned int sock_no_poll(struct file *, struct socket *, |
| 1139 | struct poll_table_struct *); |
| 1140 | extern int sock_no_ioctl(struct socket *, unsigned int, |
| 1141 | unsigned long); |
| 1142 | extern int sock_no_listen(struct socket *, int); |
| 1143 | extern int sock_no_shutdown(struct socket *, int); |
| 1144 | extern int sock_no_getsockopt(struct socket *, int , int, |
| 1145 | char __user *, int __user *); |
| 1146 | extern int sock_no_setsockopt(struct socket *, int, int, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1147 | char __user *, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | extern int sock_no_sendmsg(struct kiocb *, struct socket *, |
| 1149 | struct msghdr *, size_t); |
| 1150 | extern int sock_no_recvmsg(struct kiocb *, struct socket *, |
| 1151 | struct msghdr *, size_t, int); |
| 1152 | extern int sock_no_mmap(struct file *file, |
| 1153 | struct socket *sock, |
| 1154 | struct vm_area_struct *vma); |
| 1155 | extern ssize_t sock_no_sendpage(struct socket *sock, |
| 1156 | struct page *page, |
| 1157 | int offset, size_t size, |
| 1158 | int flags); |
| 1159 | |
| 1160 | /* |
| 1161 | * Functions to fill in entries in struct proto_ops when a protocol |
| 1162 | * uses the inet style. |
| 1163 | */ |
| 1164 | extern int sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 1165 | char __user *optval, int __user *optlen); |
| 1166 | extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 1167 | struct msghdr *msg, size_t size, int flags); |
| 1168 | extern int sock_common_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1169 | char __user *optval, unsigned int optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1170 | extern int compat_sock_common_getsockopt(struct socket *sock, int level, |
| 1171 | int optname, char __user *optval, int __user *optlen); |
| 1172 | extern int compat_sock_common_setsockopt(struct socket *sock, int level, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1173 | int optname, char __user *optval, unsigned int optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | |
| 1175 | extern void sk_common_release(struct sock *sk); |
| 1176 | |
| 1177 | /* |
| 1178 | * Default socket callbacks and setup code |
| 1179 | */ |
| 1180 | |
| 1181 | /* Initialise core socket variables */ |
| 1182 | extern void sock_init_data(struct socket *sock, struct sock *sk); |
| 1183 | |
Eric Dumazet | 46bcf14 | 2010-12-06 09:29:43 -0800 | [diff] [blame] | 1184 | extern void sk_filter_release_rcu(struct rcu_head *rcu); |
| 1185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | /** |
Ben Hutchings | 1a5778a | 2010-02-14 22:35:47 -0800 | [diff] [blame] | 1187 | * sk_filter_release - release a socket filter |
Paul Bonser | dc9b334 | 2006-11-23 17:56:13 -0800 | [diff] [blame] | 1188 | * @fp: filter to remove |
| 1189 | * |
| 1190 | * Remove a filter from a socket and release its resources. |
| 1191 | */ |
| 1192 | |
Pavel Emelyanov | 309dd5f | 2007-10-17 21:21:51 -0700 | [diff] [blame] | 1193 | static inline void sk_filter_release(struct sk_filter *fp) |
| 1194 | { |
| 1195 | if (atomic_dec_and_test(&fp->refcnt)) |
Eric Dumazet | 80f8f10 | 2011-01-18 07:46:52 +0000 | [diff] [blame] | 1196 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
Pavel Emelyanov | 309dd5f | 2007-10-17 21:21:51 -0700 | [diff] [blame] | 1197 | } |
| 1198 | |
| 1199 | 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] | 1200 | { |
| 1201 | unsigned int size = sk_filter_len(fp); |
| 1202 | |
| 1203 | atomic_sub(size, &sk->sk_omem_alloc); |
Pavel Emelyanov | 309dd5f | 2007-10-17 21:21:51 -0700 | [diff] [blame] | 1204 | sk_filter_release(fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | } |
| 1206 | |
| 1207 | static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
| 1208 | { |
| 1209 | atomic_inc(&fp->refcnt); |
| 1210 | atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); |
| 1211 | } |
| 1212 | |
| 1213 | /* |
| 1214 | * Socket reference counting postulates. |
| 1215 | * |
| 1216 | * * Each user of socket SHOULD hold a reference count. |
| 1217 | * * Each access point to socket (an hash table bucket, reference from a list, |
| 1218 | * running timer, skb in flight MUST hold a reference count. |
| 1219 | * * When reference count hits 0, it means it will never increase back. |
| 1220 | * * When reference count hits 0, it means that no references from |
| 1221 | * outside exist to this socket and current process on current CPU |
| 1222 | * is last user and may/should destroy this socket. |
| 1223 | * * sk_free is called from any context: process, BH, IRQ. When |
| 1224 | * it is called, socket has no references from outside -> sk_free |
| 1225 | * may release descendant resources allocated by the socket, but |
| 1226 | * to the time when it is called, socket is NOT referenced by any |
| 1227 | * hash tables, lists etc. |
| 1228 | * * Packets, delivered from outside (from network or from another process) |
| 1229 | * and enqueued on receive/error queues SHOULD NOT grab reference count, |
| 1230 | * when they sit in queue. Otherwise, packets will leak to hole, when |
| 1231 | * socket is looked up by one cpu and unhasing is made by another CPU. |
| 1232 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp |
| 1233 | * (leak to backlog). Packet socket does all the processing inside |
| 1234 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets |
| 1235 | * use separate SMP lock, so that they are prone too. |
| 1236 | */ |
| 1237 | |
| 1238 | /* Ungrab socket and destroy it, if it was the last reference. */ |
| 1239 | static inline void sock_put(struct sock *sk) |
| 1240 | { |
| 1241 | if (atomic_dec_and_test(&sk->sk_refcnt)) |
| 1242 | sk_free(sk); |
| 1243 | } |
| 1244 | |
Arnaldo Carvalho de Melo | 58a5a7b | 2006-11-16 14:06:06 -0200 | [diff] [blame] | 1245 | extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
| 1246 | const int nested); |
Arnaldo Carvalho de Melo | 25995ff | 2005-12-27 02:42:22 -0200 | [diff] [blame] | 1247 | |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1248 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
| 1249 | { |
| 1250 | sk->sk_tx_queue_mapping = tx_queue; |
| 1251 | } |
| 1252 | |
| 1253 | static inline void sk_tx_queue_clear(struct sock *sk) |
| 1254 | { |
| 1255 | sk->sk_tx_queue_mapping = -1; |
| 1256 | } |
| 1257 | |
| 1258 | static inline int sk_tx_queue_get(const struct sock *sk) |
| 1259 | { |
Tom Herbert | b0f77d0 | 2010-07-14 20:50:29 -0700 | [diff] [blame] | 1260 | return sk ? sk->sk_tx_queue_mapping : -1; |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1261 | } |
| 1262 | |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1263 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
| 1264 | { |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1265 | sk_tx_queue_clear(sk); |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1266 | sk->sk_socket = sock; |
| 1267 | } |
| 1268 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1269 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
| 1270 | { |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 1271 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); |
| 1272 | return &rcu_dereference_raw(sk->sk_wq)->wait; |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1273 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | /* Detach socket from process context. |
| 1275 | * Announce socket dead, detach it from wait queue and inode. |
| 1276 | * Note that parent inode held reference count on this struct sock, |
| 1277 | * we do not release it in this function, because protocol |
| 1278 | * probably wants some additional cleanups or even continuing |
| 1279 | * to work with this socket (TCP). |
| 1280 | */ |
| 1281 | static inline void sock_orphan(struct sock *sk) |
| 1282 | { |
| 1283 | write_lock_bh(&sk->sk_callback_lock); |
| 1284 | sock_set_flag(sk, SOCK_DEAD); |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1285 | sk_set_socket(sk, NULL); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1286 | sk->sk_wq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | write_unlock_bh(&sk->sk_callback_lock); |
| 1288 | } |
| 1289 | |
| 1290 | static inline void sock_graft(struct sock *sk, struct socket *parent) |
| 1291 | { |
| 1292 | write_lock_bh(&sk->sk_callback_lock); |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 1293 | sk->sk_wq = parent->wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | parent->sk = sk; |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1295 | sk_set_socket(sk, parent); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 1296 | security_sock_graft(sk, parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | write_unlock_bh(&sk->sk_callback_lock); |
| 1298 | } |
| 1299 | |
| 1300 | extern int sock_i_uid(struct sock *sk); |
| 1301 | extern unsigned long sock_i_ino(struct sock *sk); |
| 1302 | |
| 1303 | static inline struct dst_entry * |
| 1304 | __sk_dst_get(struct sock *sk) |
| 1305 | { |
Michal Hocko | d8bf4ca | 2011-07-08 14:39:41 +0200 | [diff] [blame] | 1306 | return rcu_dereference_check(sk->sk_dst_cache, sock_owned_by_user(sk) || |
Eric Dumazet | f68c224 | 2010-04-22 16:06:59 -0700 | [diff] [blame] | 1307 | lockdep_is_held(&sk->sk_lock.slock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | } |
| 1309 | |
| 1310 | static inline struct dst_entry * |
| 1311 | sk_dst_get(struct sock *sk) |
| 1312 | { |
| 1313 | struct dst_entry *dst; |
| 1314 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1315 | rcu_read_lock(); |
| 1316 | dst = rcu_dereference(sk->sk_dst_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | if (dst) |
| 1318 | dst_hold(dst); |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1319 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | return dst; |
| 1321 | } |
| 1322 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1323 | extern void sk_reset_txq(struct sock *sk); |
| 1324 | |
| 1325 | static inline void dst_negative_advice(struct sock *sk) |
| 1326 | { |
| 1327 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); |
| 1328 | |
| 1329 | if (dst && dst->ops->negative_advice) { |
| 1330 | ndst = dst->ops->negative_advice(dst); |
| 1331 | |
| 1332 | if (ndst != dst) { |
| 1333 | rcu_assign_pointer(sk->sk_dst_cache, ndst); |
| 1334 | sk_reset_txq(sk); |
| 1335 | } |
| 1336 | } |
| 1337 | } |
| 1338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | static inline void |
| 1340 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) |
| 1341 | { |
| 1342 | struct dst_entry *old_dst; |
| 1343 | |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1344 | sk_tx_queue_clear(sk); |
Eric Dumazet | 0b53ff2 | 2010-04-26 20:40:43 +0000 | [diff] [blame] | 1345 | /* |
| 1346 | * This can be called while sk is owned by the caller only, |
| 1347 | * with no state that can be checked in a rcu_dereference_check() cond |
| 1348 | */ |
| 1349 | old_dst = rcu_dereference_raw(sk->sk_dst_cache); |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1350 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | dst_release(old_dst); |
| 1352 | } |
| 1353 | |
| 1354 | static inline void |
| 1355 | sk_dst_set(struct sock *sk, struct dst_entry *dst) |
| 1356 | { |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1357 | spin_lock(&sk->sk_dst_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | __sk_dst_set(sk, dst); |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1359 | spin_unlock(&sk->sk_dst_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | } |
| 1361 | |
| 1362 | static inline void |
| 1363 | __sk_dst_reset(struct sock *sk) |
| 1364 | { |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1365 | __sk_dst_set(sk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | } |
| 1367 | |
| 1368 | static inline void |
| 1369 | sk_dst_reset(struct sock *sk) |
| 1370 | { |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1371 | spin_lock(&sk->sk_dst_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | __sk_dst_reset(sk); |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1373 | spin_unlock(&sk->sk_dst_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | } |
| 1375 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 1376 | extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 1378 | extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 1380 | static inline int sk_can_gso(const struct sock *sk) |
| 1381 | { |
| 1382 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); |
| 1383 | } |
| 1384 | |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1385 | 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] | 1386 | |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1387 | static inline void sk_nocaps_add(struct sock *sk, int flags) |
| 1388 | { |
| 1389 | sk->sk_route_nocaps |= flags; |
| 1390 | sk->sk_route_caps &= ~flags; |
| 1391 | } |
| 1392 | |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1393 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, |
| 1394 | char __user *from, char *to, |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1395 | int copy, int offset) |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1396 | { |
| 1397 | if (skb->ip_summed == CHECKSUM_NONE) { |
| 1398 | int err = 0; |
| 1399 | __wsum csum = csum_and_copy_from_user(from, to, copy, 0, &err); |
| 1400 | if (err) |
| 1401 | return err; |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1402 | skb->csum = csum_block_add(skb->csum, csum, offset); |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1403 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { |
| 1404 | if (!access_ok(VERIFY_READ, from, copy) || |
| 1405 | __copy_from_user_nocache(to, from, copy)) |
| 1406 | return -EFAULT; |
| 1407 | } else if (copy_from_user(to, from, copy)) |
| 1408 | return -EFAULT; |
| 1409 | |
| 1410 | return 0; |
| 1411 | } |
| 1412 | |
| 1413 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, |
| 1414 | char __user *from, int copy) |
| 1415 | { |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1416 | int err, offset = skb->len; |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1417 | |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1418 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), |
| 1419 | copy, offset); |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1420 | if (err) |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1421 | __skb_trim(skb, offset); |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1422 | |
| 1423 | return err; |
| 1424 | } |
| 1425 | |
| 1426 | static inline int skb_copy_to_page_nocache(struct sock *sk, char __user *from, |
| 1427 | struct sk_buff *skb, |
| 1428 | struct page *page, |
| 1429 | int off, int copy) |
| 1430 | { |
| 1431 | int err; |
| 1432 | |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1433 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, |
| 1434 | copy, skb->len); |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1435 | if (err) |
| 1436 | return err; |
| 1437 | |
| 1438 | skb->len += copy; |
| 1439 | skb->data_len += copy; |
| 1440 | skb->truesize += copy; |
| 1441 | sk->sk_wmem_queued += copy; |
| 1442 | sk_mem_charge(sk, copy); |
| 1443 | return 0; |
| 1444 | } |
| 1445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | static inline int skb_copy_to_page(struct sock *sk, char __user *from, |
| 1447 | struct sk_buff *skb, struct page *page, |
| 1448 | int off, int copy) |
| 1449 | { |
| 1450 | if (skb->ip_summed == CHECKSUM_NONE) { |
| 1451 | int err = 0; |
Al Viro | 5084205 | 2006-11-14 21:36:34 -0800 | [diff] [blame] | 1452 | __wsum csum = csum_and_copy_from_user(from, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | page_address(page) + off, |
| 1454 | copy, 0, &err); |
| 1455 | if (err) |
| 1456 | return err; |
| 1457 | skb->csum = csum_block_add(skb->csum, csum, skb->len); |
| 1458 | } else if (copy_from_user(page_address(page) + off, from, copy)) |
| 1459 | return -EFAULT; |
| 1460 | |
| 1461 | skb->len += copy; |
| 1462 | skb->data_len += copy; |
| 1463 | skb->truesize += copy; |
| 1464 | sk->sk_wmem_queued += copy; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1465 | sk_mem_charge(sk, copy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | return 0; |
| 1467 | } |
| 1468 | |
Eric Dumazet | c564039 | 2009-06-16 10:12:03 +0000 | [diff] [blame] | 1469 | /** |
| 1470 | * sk_wmem_alloc_get - returns write allocations |
| 1471 | * @sk: socket |
| 1472 | * |
| 1473 | * Returns sk_wmem_alloc minus initial offset of one |
| 1474 | */ |
| 1475 | static inline int sk_wmem_alloc_get(const struct sock *sk) |
| 1476 | { |
| 1477 | return atomic_read(&sk->sk_wmem_alloc) - 1; |
| 1478 | } |
| 1479 | |
| 1480 | /** |
| 1481 | * sk_rmem_alloc_get - returns read allocations |
| 1482 | * @sk: socket |
| 1483 | * |
| 1484 | * Returns sk_rmem_alloc |
| 1485 | */ |
| 1486 | static inline int sk_rmem_alloc_get(const struct sock *sk) |
| 1487 | { |
| 1488 | return atomic_read(&sk->sk_rmem_alloc); |
| 1489 | } |
| 1490 | |
| 1491 | /** |
| 1492 | * sk_has_allocations - check if allocations are outstanding |
| 1493 | * @sk: socket |
| 1494 | * |
| 1495 | * Returns true if socket has write or read allocations |
| 1496 | */ |
| 1497 | static inline int sk_has_allocations(const struct sock *sk) |
| 1498 | { |
| 1499 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); |
| 1500 | } |
| 1501 | |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1502 | /** |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1503 | * wq_has_sleeper - check if there are any waiting processes |
Randy Dunlap | acfbe96 | 2010-05-24 23:54:18 -0700 | [diff] [blame] | 1504 | * @wq: struct socket_wq |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1505 | * |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1506 | * Returns true if socket_wq has waiting processes |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1507 | * |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1508 | * The purpose of the wq_has_sleeper and sock_poll_wait is to wrap the memory |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1509 | * barrier call. They were added due to the race found within the tcp code. |
| 1510 | * |
| 1511 | * Consider following tcp code paths: |
| 1512 | * |
| 1513 | * CPU1 CPU2 |
| 1514 | * |
| 1515 | * sys_select receive packet |
| 1516 | * ... ... |
| 1517 | * __add_wait_queue update tp->rcv_nxt |
| 1518 | * ... ... |
| 1519 | * tp->rcv_nxt check sock_def_readable |
| 1520 | * ... { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1521 | * schedule rcu_read_lock(); |
| 1522 | * wq = rcu_dereference(sk->sk_wq); |
| 1523 | * if (wq && waitqueue_active(&wq->wait)) |
| 1524 | * wake_up_interruptible(&wq->wait) |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1525 | * ... |
| 1526 | * } |
| 1527 | * |
| 1528 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay |
| 1529 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 |
| 1530 | * could then endup calling schedule and sleep forever if there are no more |
| 1531 | * data on the socket. |
Jiri Olsa | ad46276 | 2009-07-08 12:10:31 +0000 | [diff] [blame] | 1532 | * |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1533 | */ |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1534 | static inline bool wq_has_sleeper(struct socket_wq *wq) |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1535 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1536 | |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1537 | /* |
| 1538 | * We need to be sure we are in sync with the |
| 1539 | * add_wait_queue modifications to the wait queue. |
| 1540 | * |
| 1541 | * This memory barrier is paired in the sock_poll_wait. |
| 1542 | */ |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1543 | smp_mb(); |
| 1544 | return wq && waitqueue_active(&wq->wait); |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1545 | } |
| 1546 | |
| 1547 | /** |
| 1548 | * sock_poll_wait - place memory barrier behind the poll_wait call. |
| 1549 | * @filp: file |
| 1550 | * @wait_address: socket wait queue |
| 1551 | * @p: poll_table |
| 1552 | * |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1553 | * See the comments in the wq_has_sleeper function. |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1554 | */ |
| 1555 | static inline void sock_poll_wait(struct file *filp, |
| 1556 | wait_queue_head_t *wait_address, poll_table *p) |
| 1557 | { |
| 1558 | if (p && wait_address) { |
| 1559 | poll_wait(filp, wait_address, p); |
| 1560 | /* |
| 1561 | * We need to be sure we are in sync with the |
| 1562 | * socket flags modification. |
| 1563 | * |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1564 | * This memory barrier is paired in the wq_has_sleeper. |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1565 | */ |
| 1566 | smp_mb(); |
| 1567 | } |
| 1568 | } |
| 1569 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | /* |
| 1571 | * Queue a received datagram if it will fit. Stream and sequenced |
| 1572 | * protocols can't normally use this as they need to fit buffers in |
| 1573 | * and play with them. |
| 1574 | * |
| 1575 | * Inlined as it's very short and called for pretty much every |
| 1576 | * packet ever received. |
| 1577 | */ |
| 1578 | |
| 1579 | static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
| 1580 | { |
Herbert Xu | d55d87f | 2009-06-22 02:25:25 +0000 | [diff] [blame] | 1581 | skb_orphan(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | skb->sk = sk; |
| 1583 | skb->destructor = sock_wfree; |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1584 | /* |
| 1585 | * We used to take a refcount on sk, but following operation |
| 1586 | * is enough to guarantee sk_free() wont free this sock until |
| 1587 | * all in-flight packets are completed |
| 1588 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
| 1590 | } |
| 1591 | |
| 1592 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
| 1593 | { |
Herbert Xu | d55d87f | 2009-06-22 02:25:25 +0000 | [diff] [blame] | 1594 | skb_orphan(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | skb->sk = sk; |
| 1596 | skb->destructor = sock_rfree; |
| 1597 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1598 | sk_mem_charge(sk, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | } |
| 1600 | |
| 1601 | extern void sk_reset_timer(struct sock *sk, struct timer_list* timer, |
| 1602 | unsigned long expires); |
| 1603 | |
| 1604 | extern void sk_stop_timer(struct sock *sk, struct timer_list* timer); |
| 1605 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 1606 | 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] | 1607 | |
Eric Dumazet | b1faf56 | 2010-05-31 23:44:05 -0700 | [diff] [blame] | 1608 | extern int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | |
| 1610 | /* |
| 1611 | * Recover an error report and clear atomically |
| 1612 | */ |
| 1613 | |
| 1614 | static inline int sock_error(struct sock *sk) |
| 1615 | { |
Benjamin LaHaise | c1cbe4b | 2005-12-13 23:22:19 -0800 | [diff] [blame] | 1616 | int err; |
| 1617 | if (likely(!sk->sk_err)) |
| 1618 | return 0; |
| 1619 | err = xchg(&sk->sk_err, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | return -err; |
| 1621 | } |
| 1622 | |
| 1623 | static inline unsigned long sock_wspace(struct sock *sk) |
| 1624 | { |
| 1625 | int amt = 0; |
| 1626 | |
| 1627 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| 1628 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); |
| 1629 | if (amt < 0) |
| 1630 | amt = 0; |
| 1631 | } |
| 1632 | return amt; |
| 1633 | } |
| 1634 | |
| 1635 | static inline void sk_wake_async(struct sock *sk, int how, int band) |
| 1636 | { |
Eric Dumazet | bcdce71 | 2009-10-06 17:28:29 -0700 | [diff] [blame] | 1637 | if (sock_flag(sk, SOCK_FASYNC)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | sock_wake_async(sk->sk_socket, how, band); |
| 1639 | } |
| 1640 | |
| 1641 | #define SOCK_MIN_SNDBUF 2048 |
Eric Dumazet | 7a91b434 | 2010-09-26 18:53:07 -0700 | [diff] [blame] | 1642 | /* |
| 1643 | * Since sk_rmem_alloc sums skb->truesize, even a small frame might need |
| 1644 | * sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak |
| 1645 | */ |
| 1646 | #define SOCK_MIN_RCVBUF (2048 + sizeof(struct sk_buff)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | |
| 1648 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) |
| 1649 | { |
| 1650 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { |
Eric Dumazet | 8df09ea | 2007-12-21 03:07:41 -0800 | [diff] [blame] | 1651 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
| 1653 | } |
| 1654 | } |
| 1655 | |
Pavel Emelyanov | df97c70 | 2007-11-29 21:22:33 +1100 | [diff] [blame] | 1656 | 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] | 1657 | |
| 1658 | static inline struct page *sk_stream_alloc_page(struct sock *sk) |
| 1659 | { |
| 1660 | struct page *page = NULL; |
| 1661 | |
Herbert Xu | ef01578 | 2005-09-01 17:48:59 -0700 | [diff] [blame] | 1662 | page = alloc_pages(sk->sk_allocation, 0); |
| 1663 | if (!page) { |
Pavel Emelyanov | 5c52ba1 | 2008-07-16 20:28:10 -0700 | [diff] [blame] | 1664 | sk->sk_prot->enter_memory_pressure(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | sk_stream_moderate_sndbuf(sk); |
| 1666 | } |
| 1667 | return page; |
| 1668 | } |
| 1669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | /* |
| 1671 | * Default write policy as shown to user space via poll/select/SIGIO |
| 1672 | */ |
| 1673 | static inline int sock_writeable(const struct sock *sk) |
| 1674 | { |
Eric Dumazet | 8df09ea | 2007-12-21 03:07:41 -0800 | [diff] [blame] | 1675 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | } |
| 1677 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1678 | static inline gfp_t gfp_any(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | { |
Andrew Morton | 9970937 | 2009-02-12 16:43:17 -0800 | [diff] [blame] | 1680 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | } |
| 1682 | |
| 1683 | static inline long sock_rcvtimeo(const struct sock *sk, int noblock) |
| 1684 | { |
| 1685 | return noblock ? 0 : sk->sk_rcvtimeo; |
| 1686 | } |
| 1687 | |
| 1688 | static inline long sock_sndtimeo(const struct sock *sk, int noblock) |
| 1689 | { |
| 1690 | return noblock ? 0 : sk->sk_sndtimeo; |
| 1691 | } |
| 1692 | |
| 1693 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) |
| 1694 | { |
| 1695 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; |
| 1696 | } |
| 1697 | |
| 1698 | /* Alas, with timeout socket operations are not restartable. |
| 1699 | * Compare this to poll(). |
| 1700 | */ |
| 1701 | static inline int sock_intr_errno(long timeo) |
| 1702 | { |
| 1703 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; |
| 1704 | } |
| 1705 | |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 1706 | extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
| 1707 | struct sk_buff *skb); |
| 1708 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | static __inline__ void |
| 1710 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) |
| 1711 | { |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1712 | ktime_t kt = skb->tstamp; |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1713 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1714 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1715 | /* |
| 1716 | * generate control messages if |
| 1717 | * - receive time stamping in software requested (SOCK_RCVTSTAMP |
| 1718 | * or SOCK_TIMESTAMPING_RX_SOFTWARE) |
| 1719 | * - software time stamp available and wanted |
| 1720 | * (SOCK_TIMESTAMPING_SOFTWARE) |
| 1721 | * - hardware time stamps available and wanted |
| 1722 | * (SOCK_TIMESTAMPING_SYS_HARDWARE or |
| 1723 | * SOCK_TIMESTAMPING_RAW_HARDWARE) |
| 1724 | */ |
| 1725 | if (sock_flag(sk, SOCK_RCVTSTAMP) || |
| 1726 | sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) || |
| 1727 | (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) || |
| 1728 | (hwtstamps->hwtstamp.tv64 && |
| 1729 | sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) || |
| 1730 | (hwtstamps->syststamp.tv64 && |
| 1731 | sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))) |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 1732 | __sock_recv_timestamp(msg, sk, skb); |
| 1733 | else |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 1734 | sk->sk_stamp = kt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | } |
| 1736 | |
Eric Dumazet | 767dd03 | 2010-04-28 19:14:43 +0000 | [diff] [blame] | 1737 | extern void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
| 1738 | struct sk_buff *skb); |
| 1739 | |
| 1740 | static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
| 1741 | struct sk_buff *skb) |
| 1742 | { |
| 1743 | #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ |
| 1744 | (1UL << SOCK_RCVTSTAMP) | \ |
| 1745 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ |
| 1746 | (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \ |
| 1747 | (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \ |
| 1748 | (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE)) |
| 1749 | |
| 1750 | if (sk->sk_flags & FLAGS_TS_OR_DROPS) |
| 1751 | __sock_recv_ts_and_drops(msg, sk, skb); |
| 1752 | else |
| 1753 | sk->sk_stamp = skb->tstamp; |
| 1754 | } |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | /** |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1757 | * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1758 | * @sk: socket sending this packet |
Oliver Hartkopp | 2244d07 | 2010-08-17 08:59:14 +0000 | [diff] [blame] | 1759 | * @tx_flags: filled with instructions for time stamping |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1760 | * |
| 1761 | * Currently only depends on SOCK_TIMESTAMPING* flags. Returns error code if |
| 1762 | * parameters are invalid. |
| 1763 | */ |
Oliver Hartkopp | 2244d07 | 2010-08-17 08:59:14 +0000 | [diff] [blame] | 1764 | extern int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags); |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1765 | |
| 1766 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | * sk_eat_skb - Release a skb if it is no longer needed |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1768 | * @sk: socket to eat this skb from |
| 1769 | * @skb: socket buffer to eat |
Randy Dunlap | f4b8ea7 | 2006-06-22 16:00:11 -0700 | [diff] [blame] | 1770 | * @copied_early: flag indicating whether DMA operations copied this data early |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | * |
| 1772 | * This routine must be called with interrupts disabled or with the socket |
| 1773 | * locked so that the sk_buff queue operation is ok. |
| 1774 | */ |
Chris Leech | 624d116 | 2006-05-23 18:01:28 -0700 | [diff] [blame] | 1775 | #ifdef CONFIG_NET_DMA |
| 1776 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) |
| 1777 | { |
| 1778 | __skb_unlink(skb, &sk->sk_receive_queue); |
| 1779 | if (!copied_early) |
| 1780 | __kfree_skb(skb); |
| 1781 | else |
| 1782 | __skb_queue_tail(&sk->sk_async_wait_queue, skb); |
| 1783 | } |
| 1784 | #else |
| 1785 | 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] | 1786 | { |
| 1787 | __skb_unlink(skb, &sk->sk_receive_queue); |
| 1788 | __kfree_skb(skb); |
| 1789 | } |
Chris Leech | 624d116 | 2006-05-23 18:01:28 -0700 | [diff] [blame] | 1790 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1792 | static inline |
| 1793 | struct net *sock_net(const struct sock *sk) |
| 1794 | { |
Eric Dumazet | c2d9ba9 | 2010-06-01 06:51:19 +0000 | [diff] [blame] | 1795 | return read_pnet(&sk->sk_net); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1796 | } |
| 1797 | |
| 1798 | static inline |
Denis V. Lunev | f5aa23f | 2008-03-26 00:48:17 -0700 | [diff] [blame] | 1799 | void sock_net_set(struct sock *sk, struct net *net) |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1800 | { |
Eric Dumazet | c2d9ba9 | 2010-06-01 06:51:19 +0000 | [diff] [blame] | 1801 | write_pnet(&sk->sk_net, net); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1802 | } |
| 1803 | |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1804 | /* |
| 1805 | * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace. |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1806 | * They should not hold a reference to a namespace in order to allow |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1807 | * to stop it. |
| 1808 | * Sockets after sk_change_net should be released using sk_release_kernel |
| 1809 | */ |
| 1810 | static inline void sk_change_net(struct sock *sk, struct net *net) |
| 1811 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1812 | put_net(sock_net(sk)); |
Denis V. Lunev | 65a18ec | 2008-04-16 01:59:46 -0700 | [diff] [blame] | 1813 | sock_net_set(sk, hold_net(net)); |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1814 | } |
| 1815 | |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 1816 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
| 1817 | { |
| 1818 | if (unlikely(skb->sk)) { |
| 1819 | struct sock *sk = skb->sk; |
| 1820 | |
| 1821 | skb->destructor = NULL; |
| 1822 | skb->sk = NULL; |
| 1823 | return sk; |
| 1824 | } |
| 1825 | return NULL; |
| 1826 | } |
| 1827 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1828 | extern void sock_enable_timestamp(struct sock *sk, int flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | extern int sock_get_timestamp(struct sock *, struct timeval __user *); |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 1830 | extern int sock_get_timestampns(struct sock *, struct timespec __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | |
| 1832 | /* |
| 1833 | * Enable debug/info messages |
| 1834 | */ |
Stephen Hemminger | a2a316f | 2007-03-08 20:41:08 -0800 | [diff] [blame] | 1835 | extern int net_msg_warn; |
| 1836 | #define NETDEBUG(fmt, args...) \ |
| 1837 | do { if (net_msg_warn) printk(fmt,##args); } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | |
Stephen Hemminger | a2a316f | 2007-03-08 20:41:08 -0800 | [diff] [blame] | 1839 | #define LIMIT_NETDEBUG(fmt, args...) \ |
| 1840 | do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | extern __u32 sysctl_wmem_max; |
| 1843 | extern __u32 sysctl_rmem_max; |
| 1844 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1845 | extern void sk_init(void); |
| 1846 | |
David S. Miller | 6baf1f4 | 2005-09-05 18:14:11 -0700 | [diff] [blame] | 1847 | extern int sysctl_optmem_max; |
| 1848 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1849 | extern __u32 sysctl_wmem_default; |
| 1850 | extern __u32 sysctl_rmem_default; |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1851 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | #endif /* _SOCK_H */ |