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> |
Glauber Costa | 3f13461 | 2012-05-29 15:07:11 -0700 | [diff] [blame] | 49 | #include <linux/bitops.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> |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 57 | #include <linux/page_counter.h> |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 58 | #include <linux/memcontrol.h> |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 59 | #include <linux/static_key.h> |
Al Viro | 4040153 | 2012-02-13 03:58:52 +0000 | [diff] [blame] | 60 | #include <linux/sched.h> |
Herbert Xu | 1ce0bf5 | 2015-11-26 13:55:39 +0800 | [diff] [blame] | 61 | #include <linux/wait.h> |
Tejun Heo | 2a56a1f | 2015-12-07 17:38:52 -0500 | [diff] [blame] | 62 | #include <linux/cgroup-defs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | #include <linux/filter.h> |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 65 | #include <linux/rculist_nulls.h> |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 66 | #include <linux/poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
Eric Dumazet | c31504d | 2010-11-15 19:58:26 +0000 | [diff] [blame] | 68 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #include <net/dst.h> |
| 70 | #include <net/checksum.h> |
Eric Dumazet | 1d0ab25 | 2015-03-15 21:12:12 -0700 | [diff] [blame] | 71 | #include <net/tcp_states.h> |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 72 | #include <linux/net_tstamp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | /* |
| 75 | * This structure really needs to be cleaned up. |
| 76 | * Most of it is for TCP, and not used by any of |
| 77 | * the other protocols. |
| 78 | */ |
| 79 | |
| 80 | /* Define this to get the SOCK_DBG debugging facility. */ |
| 81 | #define SOCK_DEBUGGING |
| 82 | #ifdef SOCK_DEBUGGING |
| 83 | #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ |
| 84 | printk(KERN_DEBUG msg); } while (0) |
| 85 | #else |
Stephen Hemminger | 4cd9029 | 2008-03-21 15:54:53 -0700 | [diff] [blame] | 86 | /* Validate arguments and do nothing */ |
Joe Perches | b9075fa | 2011-10-31 17:11:33 -0700 | [diff] [blame] | 87 | static inline __printf(2, 3) |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 88 | void SOCK_DEBUG(const struct sock *sk, const char *msg, ...) |
Stephen Hemminger | 4cd9029 | 2008-03-21 15:54:53 -0700 | [diff] [blame] | 89 | { |
| 90 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | #endif |
| 92 | |
| 93 | /* This is the per-socket lock. The spinlock provides a synchronization |
| 94 | * between user contexts and software interrupt processing, whereas the |
| 95 | * mini-semaphore synchronizes multiple users amongst themselves. |
| 96 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | typedef struct { |
| 98 | spinlock_t slock; |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 99 | int owned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | wait_queue_head_t wq; |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 101 | /* |
| 102 | * We express the mutex-alike socket_lock semantics |
| 103 | * to the lock validator by explicitly managing |
| 104 | * the slock as a lock variant (in addition to |
| 105 | * the slock itself): |
| 106 | */ |
| 107 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 108 | struct lockdep_map dep_map; |
| 109 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } socket_lock_t; |
| 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | struct sock; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 113 | struct proto; |
Denis V. Lunev | 0eeb8ff | 2007-12-04 01:15:45 -0800 | [diff] [blame] | 114 | struct net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Eric Dumazet | 077b393 | 2012-12-02 07:33:10 +0000 | [diff] [blame] | 116 | typedef __u32 __bitwise __portpair; |
| 117 | typedef __u64 __bitwise __addrpair; |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | /** |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 120 | * struct sock_common - minimal network layer representation of sockets |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 121 | * @skc_daddr: Foreign IPv4 addr |
| 122 | * @skc_rcv_saddr: Bound local IPv4 addr |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 123 | * @skc_hash: hash value used with various protocol lookup tables |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 124 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
Eric Dumazet | ce43b03 | 2012-11-30 09:49:27 +0000 | [diff] [blame] | 125 | * @skc_dport: placeholder for inet_dport/tw_dport |
| 126 | * @skc_num: placeholder for inet_num/tw_num |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 127 | * @skc_family: network address family |
| 128 | * @skc_state: Connection state |
| 129 | * @skc_reuse: %SO_REUSEADDR setting |
Tom Herbert | 055dc21 | 2013-01-22 09:49:50 +0000 | [diff] [blame] | 130 | * @skc_reuseport: %SO_REUSEPORT setting |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 131 | * @skc_bound_dev_if: bound device index if != 0 |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 132 | * @skc_bind_node: bind hash linkage for various protocol lookup tables |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 133 | * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 134 | * @skc_prot: protocol handlers inside a network family |
Eric W. Biederman | 07feaeb | 2007-09-12 11:58:02 +0200 | [diff] [blame] | 135 | * @skc_net: reference to the network namespace of this socket |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 136 | * @skc_node: main hash linkage for various protocol lookup tables |
| 137 | * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol |
| 138 | * @skc_tx_queue_mapping: tx queue number for this connection |
Eric Dumazet | 8e5eb54 | 2015-10-08 19:33:22 -0700 | [diff] [blame] | 139 | * @skc_flags: place holder for sk_flags |
| 140 | * %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, |
| 141 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings |
Eric Dumazet | 70da268 | 2015-10-08 19:33:21 -0700 | [diff] [blame] | 142 | * @skc_incoming_cpu: record/match cpu processing incoming packets |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 143 | * @skc_refcnt: reference count |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 144 | * |
| 145 | * This is the minimal network layer representation of sockets, the header |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 146 | * for struct sock and struct inet_timewait_sock. |
| 147 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | struct sock_common { |
Eric Dumazet | ce43b03 | 2012-11-30 09:49:27 +0000 | [diff] [blame] | 149 | /* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 150 | * address on 64bit arches : cf INET_MATCH() |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 151 | */ |
Eric Dumazet | ce43b03 | 2012-11-30 09:49:27 +0000 | [diff] [blame] | 152 | union { |
Eric Dumazet | 077b393 | 2012-12-02 07:33:10 +0000 | [diff] [blame] | 153 | __addrpair skc_addrpair; |
Eric Dumazet | ce43b03 | 2012-11-30 09:49:27 +0000 | [diff] [blame] | 154 | struct { |
| 155 | __be32 skc_daddr; |
| 156 | __be32 skc_rcv_saddr; |
| 157 | }; |
| 158 | }; |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 159 | union { |
| 160 | unsigned int skc_hash; |
| 161 | __u16 skc_u16hashes[2]; |
| 162 | }; |
Eric Dumazet | ce43b03 | 2012-11-30 09:49:27 +0000 | [diff] [blame] | 163 | /* skc_dport && skc_num must be grouped as well */ |
| 164 | union { |
Eric Dumazet | 077b393 | 2012-12-02 07:33:10 +0000 | [diff] [blame] | 165 | __portpair skc_portpair; |
Eric Dumazet | ce43b03 | 2012-11-30 09:49:27 +0000 | [diff] [blame] | 166 | struct { |
| 167 | __be16 skc_dport; |
| 168 | __u16 skc_num; |
| 169 | }; |
| 170 | }; |
| 171 | |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 172 | unsigned short skc_family; |
| 173 | volatile unsigned char skc_state; |
Tom Herbert | 055dc21 | 2013-01-22 09:49:50 +0000 | [diff] [blame] | 174 | unsigned char skc_reuse:4; |
Eric Dumazet | 9fe516b | 2014-06-27 08:36:16 -0700 | [diff] [blame] | 175 | unsigned char skc_reuseport:1; |
| 176 | unsigned char skc_ipv6only:1; |
Eric W. Biederman | 26abe14 | 2015-05-08 21:10:31 -0500 | [diff] [blame] | 177 | unsigned char skc_net_refcnt:1; |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 178 | int skc_bound_dev_if; |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 179 | union { |
| 180 | struct hlist_node skc_bind_node; |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 181 | struct hlist_node skc_portaddr_node; |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 182 | }; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 183 | struct proto *skc_prot; |
Eric W. Biederman | 0c5c9fb | 2015-03-11 23:06:44 -0500 | [diff] [blame] | 184 | possible_net_t skc_net; |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 185 | |
| 186 | #if IS_ENABLED(CONFIG_IPV6) |
| 187 | struct in6_addr skc_v6_daddr; |
| 188 | struct in6_addr skc_v6_rcv_saddr; |
| 189 | #endif |
| 190 | |
Eric Dumazet | 33cf7c9 | 2015-03-11 18:53:14 -0700 | [diff] [blame] | 191 | atomic64_t skc_cookie; |
| 192 | |
Eric Dumazet | 8e5eb54 | 2015-10-08 19:33:22 -0700 | [diff] [blame] | 193 | /* following fields are padding to force |
| 194 | * offset(struct sock, sk_refcnt) == 128 on 64bit arches |
| 195 | * assuming IPV6 is enabled. We use this padding differently |
| 196 | * for different kind of 'sockets' |
| 197 | */ |
| 198 | union { |
| 199 | unsigned long skc_flags; |
| 200 | struct sock *skc_listener; /* request_sock */ |
| 201 | struct inet_timewait_death_row *skc_tw_dr; /* inet_timewait_sock */ |
| 202 | }; |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 203 | /* |
| 204 | * fields between dontcopy_begin/dontcopy_end |
| 205 | * are not copied in sock_copy() |
| 206 | */ |
Randy Dunlap | 928c41e | 2011-01-08 17:39:21 +0000 | [diff] [blame] | 207 | /* private: */ |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 208 | int skc_dontcopy_begin[0]; |
Randy Dunlap | 928c41e | 2011-01-08 17:39:21 +0000 | [diff] [blame] | 209 | /* public: */ |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 210 | union { |
| 211 | struct hlist_node skc_node; |
| 212 | struct hlist_nulls_node skc_nulls_node; |
| 213 | }; |
| 214 | int skc_tx_queue_mapping; |
Eric Dumazet | ed53d0a | 2015-10-08 19:33:23 -0700 | [diff] [blame] | 215 | union { |
| 216 | int skc_incoming_cpu; |
| 217 | u32 skc_rcv_wnd; |
Eric Dumazet | d475f09 | 2015-10-08 19:33:24 -0700 | [diff] [blame] | 218 | u32 skc_tw_rcv_nxt; /* struct tcp_timewait_sock */ |
Eric Dumazet | ed53d0a | 2015-10-08 19:33:23 -0700 | [diff] [blame] | 219 | }; |
Eric Dumazet | 70da268 | 2015-10-08 19:33:21 -0700 | [diff] [blame] | 220 | |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 221 | atomic_t skc_refcnt; |
Randy Dunlap | 928c41e | 2011-01-08 17:39:21 +0000 | [diff] [blame] | 222 | /* private: */ |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 223 | int skc_dontcopy_end[0]; |
Eric Dumazet | ed53d0a | 2015-10-08 19:33:23 -0700 | [diff] [blame] | 224 | union { |
| 225 | u32 skc_rxhash; |
| 226 | u32 skc_window_clamp; |
Eric Dumazet | d475f09 | 2015-10-08 19:33:24 -0700 | [diff] [blame] | 227 | u32 skc_tw_snd_nxt; /* struct tcp_timewait_sock */ |
Eric Dumazet | ed53d0a | 2015-10-08 19:33:23 -0700 | [diff] [blame] | 228 | }; |
Randy Dunlap | 928c41e | 2011-01-08 17:39:21 +0000 | [diff] [blame] | 229 | /* public: */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | }; |
| 231 | |
| 232 | /** |
| 233 | * struct sock - network layer representation of sockets |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 234 | * @__sk_common: shared layout with inet_timewait_sock |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 235 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
| 236 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings |
| 237 | * @sk_lock: synchronizer |
| 238 | * @sk_rcvbuf: size of receive buffer in bytes |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 239 | * @sk_wq: sock wait queue and async head |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 240 | * @sk_rx_dst: receive input route used by early demux |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 241 | * @sk_dst_cache: destination cache |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 242 | * @sk_policy: flow policy |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 243 | * @sk_receive_queue: incoming packets |
| 244 | * @sk_wmem_alloc: transmit queue bytes committed |
| 245 | * @sk_write_queue: Packet sending queue |
| 246 | * @sk_omem_alloc: "o" is "option" or "other" |
| 247 | * @sk_wmem_queued: persistent queue size |
| 248 | * @sk_forward_alloc: space allocated forward |
Eliezer Tamir | 0602129 | 2013-06-10 11:39:50 +0300 | [diff] [blame] | 249 | * @sk_napi_id: id of the last napi context to receive data for sk |
Eliezer Tamir | dafcc43 | 2013-06-14 16:33:57 +0300 | [diff] [blame] | 250 | * @sk_ll_usec: usecs to busypoll when there is no data |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 251 | * @sk_allocation: allocation mode |
Eric Dumazet | 95bd09e | 2013-08-27 05:46:32 -0700 | [diff] [blame] | 252 | * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler) |
Eric Dumazet | c3f40d7 | 2013-09-29 01:12:40 -0700 | [diff] [blame] | 253 | * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE) |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 254 | * @sk_sndbuf: size of send buffer in bytes |
Stephen Hemminger | 293de7d | 2016-10-23 09:28:29 -0700 | [diff] [blame] | 255 | * @sk_padding: unused element for alignment |
Tom Herbert | 28448b8 | 2014-05-23 08:47:19 -0700 | [diff] [blame] | 256 | * @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets |
| 257 | * @sk_no_check_rx: allow zero checksum in RX packets |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 258 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 259 | * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 260 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 261 | * @sk_gso_max_size: Maximum GSO segment size to build |
Ben Hutchings | 1485348 | 2012-07-30 16:11:42 +0000 | [diff] [blame] | 262 | * @sk_gso_max_segs: Maximum number of GSO segments |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 263 | * @sk_lingertime: %SO_LINGER l_linger setting |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 264 | * @sk_backlog: always used with the per-socket spinlock held |
| 265 | * @sk_callback_lock: used with the callbacks in the end of this struct |
| 266 | * @sk_error_queue: rarely used |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 267 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
| 268 | * IPV6_ADDRFORM for instance) |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 269 | * @sk_err: last error |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 270 | * @sk_err_soft: errors that don't cause failure but are the cause of a |
| 271 | * persistent failure not just 'timed out' |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 272 | * @sk_drops: raw/udp drops counter |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 273 | * @sk_ack_backlog: current listen backlog |
| 274 | * @sk_max_ack_backlog: listen backlog set in listen() |
| 275 | * @sk_priority: %SO_PRIORITY setting |
| 276 | * @sk_type: socket type (%SOCK_STREAM, etc) |
| 277 | * @sk_protocol: which protocol this socket belongs in this network family |
Randy Dunlap | 53c3fa2 | 2010-08-09 13:41:07 +0000 | [diff] [blame] | 278 | * @sk_peer_pid: &struct pid for this socket's peer |
| 279 | * @sk_peer_cred: %SO_PEERCRED setting |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 280 | * @sk_rcvlowat: %SO_RCVLOWAT setting |
| 281 | * @sk_rcvtimeo: %SO_RCVTIMEO setting |
| 282 | * @sk_sndtimeo: %SO_SNDTIMEO setting |
Tom Herbert | b73c3d0 | 2014-07-01 21:32:17 -0700 | [diff] [blame] | 283 | * @sk_txhash: computed flow hash for use on transmit |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 284 | * @sk_filter: socket filtering instructions |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 285 | * @sk_timer: sock cleanup timer |
| 286 | * @sk_stamp: time stamp of last packet received |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 287 | * @sk_tsflags: SO_TIMESTAMPING socket options |
Willem de Bruijn | 09c2d25 | 2014-08-04 22:11:47 -0400 | [diff] [blame] | 288 | * @sk_tskey: counter to disambiguate concurrent tstamp requests |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 289 | * @sk_socket: Identd and reporting IO signals |
| 290 | * @sk_user_data: RPC layer private data |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 291 | * @sk_frag: cached page frag |
Randy Dunlap | d3d4f0a | 2012-04-17 14:03:53 +0000 | [diff] [blame] | 292 | * @sk_peek_off: current peek_offset value |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 293 | * @sk_send_head: front of stuff to transmit |
Martin Waitz | 67be2dd | 2005-05-01 08:59:26 -0700 | [diff] [blame] | 294 | * @sk_security: used by security modules |
Randy Dunlap | 3172936 | 2008-02-18 20:52:13 -0800 | [diff] [blame] | 295 | * @sk_mark: generic packet mark |
Tejun Heo | 2a56a1f | 2015-12-07 17:38:52 -0500 | [diff] [blame] | 296 | * @sk_cgrp_data: cgroup data for this cgroup |
Johannes Weiner | baac50b | 2016-01-14 15:21:17 -0800 | [diff] [blame] | 297 | * @sk_memcg: this socket's memory cgroup association |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 298 | * @sk_write_pending: a write to stream socket waits to start |
| 299 | * @sk_state_change: callback to indicate change in the state of the sock |
| 300 | * @sk_data_ready: callback to indicate there is data to be processed |
| 301 | * @sk_write_space: callback to indicate there is bf sending space available |
| 302 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) |
| 303 | * @sk_backlog_rcv: callback to process the backlog |
| 304 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 |
Craig Gallek | ef45614 | 2016-01-04 17:41:45 -0500 | [diff] [blame] | 305 | * @sk_reuseport_cb: reuseport group container |
Stephen Hemminger | 293de7d | 2016-10-23 09:28:29 -0700 | [diff] [blame] | 306 | * @sk_rcu: used during RCU grace period |
| 307 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | struct sock { |
| 309 | /* |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 310 | * Now struct inet_timewait_sock also uses sock_common, so please just |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | * don't add nothing before this first member (__sk_common) --acme |
| 312 | */ |
| 313 | struct sock_common __sk_common; |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 314 | #define sk_node __sk_common.skc_node |
| 315 | #define sk_nulls_node __sk_common.skc_nulls_node |
| 316 | #define sk_refcnt __sk_common.skc_refcnt |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 317 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 318 | |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 319 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin |
| 320 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 321 | #define sk_hash __sk_common.skc_hash |
Eric Dumazet | 5080546 | 2013-10-02 04:29:50 -0700 | [diff] [blame] | 322 | #define sk_portpair __sk_common.skc_portpair |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 323 | #define sk_num __sk_common.skc_num |
| 324 | #define sk_dport __sk_common.skc_dport |
Eric Dumazet | 5080546 | 2013-10-02 04:29:50 -0700 | [diff] [blame] | 325 | #define sk_addrpair __sk_common.skc_addrpair |
| 326 | #define sk_daddr __sk_common.skc_daddr |
| 327 | #define sk_rcv_saddr __sk_common.skc_rcv_saddr |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | #define sk_family __sk_common.skc_family |
| 329 | #define sk_state __sk_common.skc_state |
| 330 | #define sk_reuse __sk_common.skc_reuse |
Tom Herbert | 055dc21 | 2013-01-22 09:49:50 +0000 | [diff] [blame] | 331 | #define sk_reuseport __sk_common.skc_reuseport |
Eric Dumazet | 9fe516b | 2014-06-27 08:36:16 -0700 | [diff] [blame] | 332 | #define sk_ipv6only __sk_common.skc_ipv6only |
Eric W. Biederman | 26abe14 | 2015-05-08 21:10:31 -0500 | [diff] [blame] | 333 | #define sk_net_refcnt __sk_common.skc_net_refcnt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | #define sk_bind_node __sk_common.skc_bind_node |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 336 | #define sk_prot __sk_common.skc_prot |
Eric W. Biederman | 07feaeb | 2007-09-12 11:58:02 +0200 | [diff] [blame] | 337 | #define sk_net __sk_common.skc_net |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 338 | #define sk_v6_daddr __sk_common.skc_v6_daddr |
| 339 | #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr |
Eric Dumazet | 33cf7c9 | 2015-03-11 18:53:14 -0700 | [diff] [blame] | 340 | #define sk_cookie __sk_common.skc_cookie |
Eric Dumazet | 70da268 | 2015-10-08 19:33:21 -0700 | [diff] [blame] | 341 | #define sk_incoming_cpu __sk_common.skc_incoming_cpu |
Eric Dumazet | 8e5eb54 | 2015-10-08 19:33:22 -0700 | [diff] [blame] | 342 | #define sk_flags __sk_common.skc_flags |
Eric Dumazet | ed53d0a | 2015-10-08 19:33:23 -0700 | [diff] [blame] | 343 | #define sk_rxhash __sk_common.skc_rxhash |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 344 | |
Eric Dumazet | b178bb3 | 2010-11-16 05:56:04 +0000 | [diff] [blame] | 345 | socket_lock_t sk_lock; |
Eric Dumazet | 9115e8c | 2016-12-03 11:14:56 -0800 | [diff] [blame] | 346 | atomic_t sk_drops; |
| 347 | int sk_rcvlowat; |
| 348 | struct sk_buff_head sk_error_queue; |
Eric Dumazet | b178bb3 | 2010-11-16 05:56:04 +0000 | [diff] [blame] | 349 | struct sk_buff_head sk_receive_queue; |
| 350 | /* |
| 351 | * The backlog queue is special, it is always used with |
| 352 | * the per-socket spinlock held and requires low latency |
| 353 | * access. Therefore we special case it's implementation. |
| 354 | * Note : rmem_alloc is in this structure to fill a hole |
| 355 | * on 64bit arches, not because its logically part of |
| 356 | * backlog. |
| 357 | */ |
| 358 | struct { |
| 359 | atomic_t rmem_alloc; |
| 360 | int len; |
| 361 | struct sk_buff *head; |
| 362 | struct sk_buff *tail; |
| 363 | } sk_backlog; |
| 364 | #define sk_rmem_alloc sk_backlog.rmem_alloc |
Eric Dumazet | 2c8c56e | 2014-11-11 05:54:28 -0800 | [diff] [blame] | 365 | |
Eric Dumazet | 9115e8c | 2016-12-03 11:14:56 -0800 | [diff] [blame] | 366 | int sk_forward_alloc; |
Cong Wang | e0d1095 | 2013-08-01 11:10:25 +0800 | [diff] [blame] | 367 | #ifdef CONFIG_NET_RX_BUSY_POLL |
Eliezer Tamir | dafcc43 | 2013-06-14 16:33:57 +0300 | [diff] [blame] | 368 | unsigned int sk_ll_usec; |
Eric Dumazet | 9115e8c | 2016-12-03 11:14:56 -0800 | [diff] [blame] | 369 | /* ===== mostly read cache line ===== */ |
| 370 | unsigned int sk_napi_id; |
Eliezer Tamir | 0602129 | 2013-06-10 11:39:50 +0300 | [diff] [blame] | 371 | #endif |
Eric Dumazet | b178bb3 | 2010-11-16 05:56:04 +0000 | [diff] [blame] | 372 | int sk_rcvbuf; |
| 373 | |
| 374 | struct sk_filter __rcu *sk_filter; |
Eric Dumazet | ceb5d58 | 2015-11-29 20:03:11 -0800 | [diff] [blame] | 375 | union { |
| 376 | struct socket_wq __rcu *sk_wq; |
| 377 | struct socket_wq *sk_wq_raw; |
| 378 | }; |
Eric Dumazet | b178bb3 | 2010-11-16 05:56:04 +0000 | [diff] [blame] | 379 | #ifdef CONFIG_XFRM |
Eric Dumazet | d188ba8 | 2015-12-08 07:22:02 -0800 | [diff] [blame] | 380 | struct xfrm_policy __rcu *sk_policy[2]; |
Eric Dumazet | b178bb3 | 2010-11-16 05:56:04 +0000 | [diff] [blame] | 381 | #endif |
Eric Dumazet | deaa585 | 2012-06-24 20:22:49 +0000 | [diff] [blame] | 382 | struct dst_entry *sk_rx_dst; |
Cong Wang | 0e36cbb | 2013-01-22 21:09:51 +0000 | [diff] [blame] | 383 | struct dst_entry __rcu *sk_dst_cache; |
Eric Dumazet | b178bb3 | 2010-11-16 05:56:04 +0000 | [diff] [blame] | 384 | atomic_t sk_omem_alloc; |
| 385 | int sk_sndbuf; |
Eric Dumazet | 9115e8c | 2016-12-03 11:14:56 -0800 | [diff] [blame] | 386 | |
| 387 | /* ===== cache line for TX ===== */ |
| 388 | int sk_wmem_queued; |
| 389 | atomic_t sk_wmem_alloc; |
| 390 | unsigned long sk_tsq_flags; |
| 391 | struct sk_buff *sk_send_head; |
Eric Dumazet | b178bb3 | 2010-11-16 05:56:04 +0000 | [diff] [blame] | 392 | struct sk_buff_head sk_write_queue; |
Eric Dumazet | 9115e8c | 2016-12-03 11:14:56 -0800 | [diff] [blame] | 393 | __s32 sk_peek_off; |
| 394 | int sk_write_pending; |
| 395 | long sk_sndtimeo; |
| 396 | struct timer_list sk_timer; |
| 397 | __u32 sk_priority; |
| 398 | __u32 sk_mark; |
| 399 | u32 sk_pacing_rate; /* bytes per second */ |
| 400 | u32 sk_max_pacing_rate; |
| 401 | struct page_frag sk_frag; |
| 402 | netdev_features_t sk_route_caps; |
| 403 | netdev_features_t sk_route_nocaps; |
| 404 | int sk_gso_type; |
| 405 | unsigned int sk_gso_max_size; |
| 406 | gfp_t sk_allocation; |
| 407 | __u32 sk_txhash; |
Andrey Ryabinin | fc64869 | 2016-05-18 19:19:27 +0300 | [diff] [blame] | 408 | |
| 409 | /* |
| 410 | * Because of non atomicity rules, all |
| 411 | * changes are protected by socket lock. |
| 412 | */ |
David Ahern | aa4c103 | 2016-12-01 08:48:06 -0800 | [diff] [blame] | 413 | unsigned int __sk_flags_offset[0]; |
| 414 | #ifdef __BIG_ENDIAN_BITFIELD |
| 415 | #define SK_FL_PROTO_SHIFT 16 |
| 416 | #define SK_FL_PROTO_MASK 0x00ff0000 |
| 417 | |
| 418 | #define SK_FL_TYPE_SHIFT 0 |
| 419 | #define SK_FL_TYPE_MASK 0x0000ffff |
| 420 | #else |
| 421 | #define SK_FL_PROTO_SHIFT 8 |
| 422 | #define SK_FL_PROTO_MASK 0x0000ff00 |
| 423 | |
| 424 | #define SK_FL_TYPE_SHIFT 16 |
| 425 | #define SK_FL_TYPE_MASK 0xffff0000 |
| 426 | #endif |
| 427 | |
Vegard Nossum | a98b65a | 2009-02-26 14:46:57 +0100 | [diff] [blame] | 428 | kmemcheck_bitfield_begin(flags); |
Andrey Ryabinin | fc64869 | 2016-05-18 19:19:27 +0300 | [diff] [blame] | 429 | unsigned int sk_padding : 2, |
Tom Herbert | 28448b8 | 2014-05-23 08:47:19 -0700 | [diff] [blame] | 430 | sk_no_check_tx : 1, |
| 431 | sk_no_check_rx : 1, |
Eric Dumazet | 5fdb997 | 2009-10-08 22:50:25 +0000 | [diff] [blame] | 432 | sk_userlocks : 4, |
| 433 | sk_protocol : 8, |
| 434 | sk_type : 16; |
Hannes Frederic Sowa | 7bbadd2 | 2015-12-14 23:30:43 +0100 | [diff] [blame] | 435 | #define SK_PROTOCOL_MAX U8_MAX |
Vegard Nossum | a98b65a | 2009-02-26 14:46:57 +0100 | [diff] [blame] | 436 | kmemcheck_bitfield_end(flags); |
Andrey Ryabinin | fc64869 | 2016-05-18 19:19:27 +0300 | [diff] [blame] | 437 | |
Ben Hutchings | 1485348 | 2012-07-30 16:11:42 +0000 | [diff] [blame] | 438 | u16 sk_gso_max_segs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | unsigned long sk_lingertime; |
Arnaldo Carvalho de Melo | 476e19c | 2005-05-05 13:35:15 -0700 | [diff] [blame] | 440 | struct proto *sk_prot_creator; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | rwlock_t sk_callback_lock; |
| 442 | int sk_err, |
| 443 | sk_err_soft; |
Eric Dumazet | becb74f | 2015-03-19 19:04:21 -0700 | [diff] [blame] | 444 | u32 sk_ack_backlog; |
| 445 | u32 sk_max_ack_backlog; |
Lorenzo Colitti | 86741ec | 2016-11-04 02:23:41 +0900 | [diff] [blame] | 446 | kuid_t sk_uid; |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 447 | struct pid *sk_peer_pid; |
| 448 | const struct cred *sk_peer_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | long sk_rcvtimeo; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 450 | ktime_t sk_stamp; |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 451 | u16 sk_tsflags; |
Andrey Ryabinin | fc64869 | 2016-05-18 19:19:27 +0300 | [diff] [blame] | 452 | u8 sk_shutdown; |
Willem de Bruijn | 09c2d25 | 2014-08-04 22:11:47 -0400 | [diff] [blame] | 453 | u32 sk_tskey; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | struct socket *sk_socket; |
| 455 | void *sk_user_data; |
Alexey Dobriyan | d5f6423 | 2008-11-04 14:45:58 -0800 | [diff] [blame] | 456 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | void *sk_security; |
Alexey Dobriyan | d5f6423 | 2008-11-04 14:45:58 -0800 | [diff] [blame] | 458 | #endif |
Tejun Heo | 2a56a1f | 2015-12-07 17:38:52 -0500 | [diff] [blame] | 459 | struct sock_cgroup_data sk_cgrp_data; |
Johannes Weiner | baac50b | 2016-01-14 15:21:17 -0800 | [diff] [blame] | 460 | struct mem_cgroup *sk_memcg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | void (*sk_state_change)(struct sock *sk); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 462 | void (*sk_data_ready)(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | void (*sk_write_space)(struct sock *sk); |
| 464 | void (*sk_error_report)(struct sock *sk); |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 465 | int (*sk_backlog_rcv)(struct sock *sk, |
| 466 | struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | void (*sk_destruct)(struct sock *sk); |
Craig Gallek | ef45614 | 2016-01-04 17:41:45 -0500 | [diff] [blame] | 468 | struct sock_reuseport __rcu *sk_reuseport_cb; |
Eric Dumazet | a4298e4 | 2016-04-01 08:52:12 -0700 | [diff] [blame] | 469 | struct rcu_head sk_rcu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | }; |
| 471 | |
Pravin B Shelar | 559835ea | 2013-09-24 10:25:40 -0700 | [diff] [blame] | 472 | #define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data))) |
| 473 | |
| 474 | #define rcu_dereference_sk_user_data(sk) rcu_dereference(__sk_user_data((sk))) |
| 475 | #define rcu_assign_sk_user_data(sk, ptr) rcu_assign_pointer(__sk_user_data((sk)), ptr) |
| 476 | |
Pavel Emelyanov | 4a17fd5 | 2012-04-19 03:39:36 +0000 | [diff] [blame] | 477 | /* |
| 478 | * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK |
| 479 | * or not whether his port will be reused by someone else. SK_FORCE_REUSE |
| 480 | * on a socket means that the socket will reuse everybody else's port |
| 481 | * without looking at the other's sk_reuse value. |
| 482 | */ |
| 483 | |
| 484 | #define SK_NO_REUSE 0 |
| 485 | #define SK_CAN_REUSE 1 |
| 486 | #define SK_FORCE_REUSE 2 |
| 487 | |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 488 | int sk_set_peek_off(struct sock *sk, int val); |
| 489 | |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 490 | static inline int sk_peek_offset(struct sock *sk, int flags) |
| 491 | { |
Willem de Bruijn | b9bb53f | 2016-04-05 12:41:14 -0400 | [diff] [blame] | 492 | if (unlikely(flags & MSG_PEEK)) { |
| 493 | s32 off = READ_ONCE(sk->sk_peek_off); |
| 494 | if (off >= 0) |
| 495 | return off; |
| 496 | } |
| 497 | |
| 498 | return 0; |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | static inline void sk_peek_offset_bwd(struct sock *sk, int val) |
| 502 | { |
Willem de Bruijn | b9bb53f | 2016-04-05 12:41:14 -0400 | [diff] [blame] | 503 | s32 off = READ_ONCE(sk->sk_peek_off); |
| 504 | |
| 505 | if (unlikely(off >= 0)) { |
| 506 | off = max_t(s32, off - val, 0); |
| 507 | WRITE_ONCE(sk->sk_peek_off, off); |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 508 | } |
| 509 | } |
| 510 | |
| 511 | static inline void sk_peek_offset_fwd(struct sock *sk, int val) |
| 512 | { |
Willem de Bruijn | b9bb53f | 2016-04-05 12:41:14 -0400 | [diff] [blame] | 513 | sk_peek_offset_bwd(sk, -val); |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 514 | } |
| 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | /* |
| 517 | * Hashed lists helper routines |
| 518 | */ |
Li Zefan | c414664 | 2010-02-08 23:18:45 +0000 | [diff] [blame] | 519 | static inline struct sock *sk_entry(const struct hlist_node *node) |
| 520 | { |
| 521 | return hlist_entry(node, struct sock, sk_node); |
| 522 | } |
| 523 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 524 | static inline struct sock *__sk_head(const struct hlist_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | { |
| 526 | return hlist_entry(head->first, struct sock, sk_node); |
| 527 | } |
| 528 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 529 | static inline struct sock *sk_head(const struct hlist_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | { |
| 531 | return hlist_empty(head) ? NULL : __sk_head(head); |
| 532 | } |
| 533 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 534 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) |
| 535 | { |
| 536 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); |
| 537 | } |
| 538 | |
| 539 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) |
| 540 | { |
| 541 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); |
| 542 | } |
| 543 | |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 544 | static inline struct sock *sk_next(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | { |
| 546 | return sk->sk_node.next ? |
| 547 | hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; |
| 548 | } |
| 549 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 550 | static inline struct sock *sk_nulls_next(const struct sock *sk) |
| 551 | { |
| 552 | return (!is_a_nulls(sk->sk_nulls_node.next)) ? |
| 553 | hlist_nulls_entry(sk->sk_nulls_node.next, |
| 554 | struct sock, sk_nulls_node) : |
| 555 | NULL; |
| 556 | } |
| 557 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 558 | static inline bool sk_unhashed(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | { |
| 560 | return hlist_unhashed(&sk->sk_node); |
| 561 | } |
| 562 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 563 | static inline bool sk_hashed(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | { |
Akinobu Mita | da753be | 2006-04-28 15:21:23 -0700 | [diff] [blame] | 565 | return !sk_unhashed(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | } |
| 567 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 568 | static inline void sk_node_init(struct hlist_node *node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | { |
| 570 | node->pprev = NULL; |
| 571 | } |
| 572 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 573 | static inline void sk_nulls_node_init(struct hlist_nulls_node *node) |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 574 | { |
| 575 | node->pprev = NULL; |
| 576 | } |
| 577 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 578 | static inline void __sk_del_node(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | { |
| 580 | __hlist_del(&sk->sk_node); |
| 581 | } |
| 582 | |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 583 | /* NB: equivalent to hlist_del_init_rcu */ |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 584 | static inline bool __sk_del_node_init(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | { |
| 586 | if (sk_hashed(sk)) { |
| 587 | __sk_del_node(sk); |
| 588 | sk_node_init(&sk->sk_node); |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 589 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | } |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 591 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | /* Grab socket reference count. This operation is valid only |
| 595 | when sk is ALREADY grabbed f.e. it is found in hash table |
| 596 | or a list and the lookup is made under lock preventing hash table |
| 597 | modifications. |
| 598 | */ |
| 599 | |
Denys Vlasenko | f9a7cbb | 2016-04-08 17:51:54 +0200 | [diff] [blame] | 600 | static __always_inline void sock_hold(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | { |
| 602 | atomic_inc(&sk->sk_refcnt); |
| 603 | } |
| 604 | |
| 605 | /* Ungrab socket in the context, which assumes that socket refcnt |
| 606 | cannot hit zero, f.e. it is true in context of any socketcall. |
| 607 | */ |
Denys Vlasenko | f9a7cbb | 2016-04-08 17:51:54 +0200 | [diff] [blame] | 608 | static __always_inline void __sock_put(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | { |
| 610 | atomic_dec(&sk->sk_refcnt); |
| 611 | } |
| 612 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 613 | static inline bool sk_del_node_init(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | { |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 615 | bool rc = __sk_del_node_init(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
| 617 | if (rc) { |
| 618 | /* paranoid for a while -acme */ |
| 619 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); |
| 620 | __sock_put(sk); |
| 621 | } |
| 622 | return rc; |
| 623 | } |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 624 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 626 | static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk) |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 627 | { |
| 628 | if (sk_hashed(sk)) { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 629 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node); |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 630 | return true; |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 631 | } |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 632 | return false; |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 633 | } |
| 634 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 635 | static inline bool sk_nulls_del_node_init_rcu(struct sock *sk) |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 636 | { |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 637 | bool rc = __sk_nulls_del_node_init_rcu(sk); |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 638 | |
| 639 | if (rc) { |
| 640 | /* paranoid for a while -acme */ |
| 641 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); |
| 642 | __sock_put(sk); |
| 643 | } |
| 644 | return rc; |
| 645 | } |
| 646 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 647 | static inline void __sk_add_node(struct sock *sk, struct hlist_head *list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | { |
| 649 | hlist_add_head(&sk->sk_node, list); |
| 650 | } |
| 651 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 652 | static inline void sk_add_node(struct sock *sk, struct hlist_head *list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | { |
| 654 | sock_hold(sk); |
| 655 | __sk_add_node(sk, list); |
| 656 | } |
| 657 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 658 | static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list) |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 659 | { |
| 660 | sock_hold(sk); |
Craig Gallek | d296ba6 | 2016-04-25 10:42:12 -0400 | [diff] [blame] | 661 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
| 662 | sk->sk_family == AF_INET6) |
| 663 | hlist_add_tail_rcu(&sk->sk_node, list); |
| 664 | else |
| 665 | hlist_add_head_rcu(&sk->sk_node, list); |
stephen hemminger | 808f511 | 2010-02-22 07:57:18 +0000 | [diff] [blame] | 666 | } |
| 667 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 668 | 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] | 669 | { |
Craig Gallek | d894ba1 | 2016-04-12 13:11:25 -0400 | [diff] [blame] | 670 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
| 671 | sk->sk_family == AF_INET6) |
| 672 | hlist_nulls_add_tail_rcu(&sk->sk_nulls_node, list); |
| 673 | else |
| 674 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 675 | } |
| 676 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 677 | 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] | 678 | { |
| 679 | sock_hold(sk); |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 680 | __sk_nulls_add_node_rcu(sk, list); |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 681 | } |
| 682 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 683 | static inline void __sk_del_bind_node(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | { |
| 685 | __hlist_del(&sk->sk_bind_node); |
| 686 | } |
| 687 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 688 | static inline void sk_add_bind_node(struct sock *sk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | struct hlist_head *list) |
| 690 | { |
| 691 | hlist_add_head(&sk->sk_bind_node, list); |
| 692 | } |
| 693 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 694 | #define sk_for_each(__sk, list) \ |
| 695 | hlist_for_each_entry(__sk, list, sk_node) |
| 696 | #define sk_for_each_rcu(__sk, list) \ |
| 697 | hlist_for_each_entry_rcu(__sk, list, sk_node) |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 698 | #define sk_nulls_for_each(__sk, node, list) \ |
| 699 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) |
| 700 | #define sk_nulls_for_each_rcu(__sk, node, list) \ |
| 701 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node) |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 702 | #define sk_for_each_from(__sk) \ |
| 703 | hlist_for_each_entry_from(__sk, sk_node) |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 704 | #define sk_nulls_for_each_from(__sk, node) \ |
| 705 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ |
| 706 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node) |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 707 | #define sk_for_each_safe(__sk, tmp, list) \ |
| 708 | hlist_for_each_entry_safe(__sk, tmp, list, sk_node) |
| 709 | #define sk_for_each_bound(__sk, list) \ |
| 710 | hlist_for_each_entry(__sk, list, sk_bind_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 712 | /** |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 713 | * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 714 | * @tpos: the type * to use as a loop cursor. |
| 715 | * @pos: the &struct hlist_node to use as a loop cursor. |
| 716 | * @head: the head for your list. |
| 717 | * @offset: offset of hlist_node within the struct. |
| 718 | * |
| 719 | */ |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 720 | #define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \ |
| 721 | for (pos = rcu_dereference((head)->first); \ |
| 722 | pos != NULL && \ |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 723 | ({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \ |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 724 | pos = rcu_dereference(pos->next)) |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 725 | |
Eric W. Biederman | c336d14 | 2012-05-24 17:56:43 -0600 | [diff] [blame] | 726 | static inline struct user_namespace *sk_user_ns(struct sock *sk) |
| 727 | { |
| 728 | /* Careful only use this in a context where these parameters |
| 729 | * can not change and must all be valid, such as recvmsg from |
| 730 | * userspace. |
| 731 | */ |
| 732 | return sk->sk_socket->file->f_cred->user_ns; |
| 733 | } |
| 734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | /* Sock flags */ |
| 736 | enum sock_flags { |
| 737 | SOCK_DEAD, |
| 738 | SOCK_DONE, |
| 739 | SOCK_URGINLINE, |
| 740 | SOCK_KEEPOPEN, |
| 741 | SOCK_LINGER, |
| 742 | SOCK_DESTROY, |
| 743 | SOCK_BROADCAST, |
| 744 | SOCK_TIMESTAMP, |
| 745 | SOCK_ZAPPED, |
| 746 | SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ |
| 747 | SOCK_DBG, /* %SO_DEBUG setting */ |
| 748 | SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 749 | SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ |
| 751 | SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ |
Mel Gorman | 7cb0240 | 2012-07-31 16:44:16 -0700 | [diff] [blame] | 752 | SOCK_MEMALLOC, /* VM depends on this socket for swapping */ |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 753 | SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ |
Eric Dumazet | bcdce71 | 2009-10-06 17:28:29 -0700 | [diff] [blame] | 754 | SOCK_FASYNC, /* fasync() active */ |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 755 | SOCK_RXQ_OVFL, |
Shirley Ma | 1cdebb4 | 2011-07-06 12:17:30 +0000 | [diff] [blame] | 756 | SOCK_ZEROCOPY, /* buffers from userspace */ |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 757 | SOCK_WIFI_STATUS, /* push wifi status to userspace */ |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 758 | SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS. |
| 759 | * Will use last 4 bytes of packet sent from |
| 760 | * user-space instead. |
| 761 | */ |
Vincent Bernat | d59577b | 2013-01-16 22:55:49 +0100 | [diff] [blame] | 762 | SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */ |
Keller, Jacob E | 7d4c04f | 2013-03-28 11:19:25 +0000 | [diff] [blame] | 763 | SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */ |
Eric Dumazet | a4298e4 | 2016-04-01 08:52:12 -0700 | [diff] [blame] | 764 | SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | }; |
| 766 | |
Marcelo Ricardo Leitner | 01ce63c | 2015-12-04 15:14:04 -0200 | [diff] [blame] | 767 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
| 768 | |
Ralf Baechle | 53b924b | 2005-08-23 10:11:30 -0700 | [diff] [blame] | 769 | static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) |
| 770 | { |
| 771 | nsk->sk_flags = osk->sk_flags; |
| 772 | } |
| 773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) |
| 775 | { |
| 776 | __set_bit(flag, &sk->sk_flags); |
| 777 | } |
| 778 | |
| 779 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) |
| 780 | { |
| 781 | __clear_bit(flag, &sk->sk_flags); |
| 782 | } |
| 783 | |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 784 | static inline bool sock_flag(const struct sock *sk, enum sock_flags flag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | { |
| 786 | return test_bit(flag, &sk->sk_flags); |
| 787 | } |
| 788 | |
Mel Gorman | c93bdd0 | 2012-07-31 16:44:19 -0700 | [diff] [blame] | 789 | #ifdef CONFIG_NET |
| 790 | extern struct static_key memalloc_socks; |
| 791 | static inline int sk_memalloc_socks(void) |
| 792 | { |
| 793 | return static_key_false(&memalloc_socks); |
| 794 | } |
| 795 | #else |
| 796 | |
| 797 | static inline int sk_memalloc_socks(void) |
| 798 | { |
| 799 | return 0; |
| 800 | } |
| 801 | |
| 802 | #endif |
| 803 | |
Eric Dumazet | 7450aaf | 2015-11-30 08:57:28 -0800 | [diff] [blame] | 804 | static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask) |
Mel Gorman | 99a1dec | 2012-07-31 16:44:14 -0700 | [diff] [blame] | 805 | { |
Eric Dumazet | 7450aaf | 2015-11-30 08:57:28 -0800 | [diff] [blame] | 806 | return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC); |
Mel Gorman | 99a1dec | 2012-07-31 16:44:14 -0700 | [diff] [blame] | 807 | } |
| 808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | static inline void sk_acceptq_removed(struct sock *sk) |
| 810 | { |
| 811 | sk->sk_ack_backlog--; |
| 812 | } |
| 813 | |
| 814 | static inline void sk_acceptq_added(struct sock *sk) |
| 815 | { |
| 816 | sk->sk_ack_backlog++; |
| 817 | } |
| 818 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 819 | static inline bool sk_acceptq_is_full(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | { |
David S. Miller | 64a1465 | 2007-03-06 11:21:05 -0800 | [diff] [blame] | 821 | return sk->sk_ack_backlog > sk->sk_max_ack_backlog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
| 823 | |
| 824 | /* |
| 825 | * Compute minimal free write space needed to queue new packets. |
| 826 | */ |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 827 | static inline int sk_stream_min_wspace(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | { |
Eric Dumazet | 8df09ea | 2007-12-21 03:07:41 -0800 | [diff] [blame] | 829 | return sk->sk_wmem_queued >> 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | } |
| 831 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 832 | static inline int sk_stream_wspace(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | { |
| 834 | return sk->sk_sndbuf - sk->sk_wmem_queued; |
| 835 | } |
| 836 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 837 | void sk_stream_write_space(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 839 | /* OOB backlog add */ |
Zhu Yi | a3a858f | 2010-03-04 18:01:47 +0000 | [diff] [blame] | 840 | 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] | 841 | { |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 842 | /* dont let skb dst not refcounted, we are going to leave rcu lock */ |
Eric Dumazet | 5037e9e | 2015-12-14 14:08:53 -0800 | [diff] [blame] | 843 | skb_dst_force_safe(skb); |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 844 | |
| 845 | if (!sk->sk_backlog.tail) |
| 846 | sk->sk_backlog.head = skb; |
| 847 | else |
Stephen Hemminger | 9ee6b53 | 2005-11-08 09:39:42 -0800 | [diff] [blame] | 848 | sk->sk_backlog.tail->next = skb; |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 849 | |
| 850 | sk->sk_backlog.tail = skb; |
Stephen Hemminger | 9ee6b53 | 2005-11-08 09:39:42 -0800 | [diff] [blame] | 851 | skb->next = NULL; |
| 852 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 854 | /* |
| 855 | * Take into account size of receive queue and backlog queue |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 856 | * Do not take into account this skb truesize, |
| 857 | * to allow even a single big packet to come. |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 858 | */ |
Sorin Dumitru | 274f482 | 2014-07-22 21:16:51 +0300 | [diff] [blame] | 859 | static inline bool sk_rcvqueues_full(const struct sock *sk, unsigned int limit) |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 860 | { |
| 861 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); |
| 862 | |
Eric Dumazet | f545a38 | 2012-04-22 23:34:26 +0000 | [diff] [blame] | 863 | return qsize > limit; |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 864 | } |
| 865 | |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 866 | /* The per-socket spinlock must be held here. */ |
Eric Dumazet | f545a38 | 2012-04-22 23:34:26 +0000 | [diff] [blame] | 867 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb, |
| 868 | unsigned int limit) |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 869 | { |
Sorin Dumitru | 274f482 | 2014-07-22 21:16:51 +0300 | [diff] [blame] | 870 | if (sk_rcvqueues_full(sk, limit)) |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 871 | return -ENOBUFS; |
| 872 | |
Eric Dumazet | c7c49b8 | 2015-09-29 18:52:25 -0700 | [diff] [blame] | 873 | /* |
| 874 | * If the skb was allocated from pfmemalloc reserves, only |
| 875 | * allow SOCK_MEMALLOC sockets to use it as this socket is |
| 876 | * helping free memory |
| 877 | */ |
| 878 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) |
| 879 | return -ENOMEM; |
| 880 | |
Zhu Yi | a3a858f | 2010-03-04 18:01:47 +0000 | [diff] [blame] | 881 | __sk_add_backlog(sk, skb); |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 882 | sk->sk_backlog.len += skb->truesize; |
| 883 | return 0; |
| 884 | } |
| 885 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 886 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 887 | |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 888 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
| 889 | { |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 890 | if (sk_memalloc_socks() && skb_pfmemalloc(skb)) |
| 891 | return __sk_backlog_rcv(sk, skb); |
| 892 | |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 893 | return sk->sk_backlog_rcv(sk, skb); |
| 894 | } |
| 895 | |
Eric Dumazet | 2c8c56e | 2014-11-11 05:54:28 -0800 | [diff] [blame] | 896 | static inline void sk_incoming_cpu_update(struct sock *sk) |
| 897 | { |
| 898 | sk->sk_incoming_cpu = raw_smp_processor_id(); |
| 899 | } |
| 900 | |
Tom Herbert | fe47755 | 2013-12-22 18:54:31 +0800 | [diff] [blame] | 901 | static inline void sock_rps_record_flow_hash(__u32 hash) |
David S. Miller | c58dc01 | 2010-04-27 15:05:31 -0700 | [diff] [blame] | 902 | { |
| 903 | #ifdef CONFIG_RPS |
| 904 | struct rps_sock_flow_table *sock_flow_table; |
| 905 | |
| 906 | rcu_read_lock(); |
| 907 | sock_flow_table = rcu_dereference(rps_sock_flow_table); |
Tom Herbert | fe47755 | 2013-12-22 18:54:31 +0800 | [diff] [blame] | 908 | rps_record_sock_flow(sock_flow_table, hash); |
David S. Miller | c58dc01 | 2010-04-27 15:05:31 -0700 | [diff] [blame] | 909 | rcu_read_unlock(); |
| 910 | #endif |
| 911 | } |
| 912 | |
Tom Herbert | fe47755 | 2013-12-22 18:54:31 +0800 | [diff] [blame] | 913 | static inline void sock_rps_record_flow(const struct sock *sk) |
| 914 | { |
Zhi Yong Wu | c9d8ca0 | 2014-01-01 04:31:01 +0800 | [diff] [blame] | 915 | #ifdef CONFIG_RPS |
Eric Dumazet | 13bfff2 | 2016-12-07 08:29:10 -0800 | [diff] [blame] | 916 | if (static_key_false(&rfs_needed)) { |
| 917 | /* Reading sk->sk_rxhash might incur an expensive cache line |
| 918 | * miss. |
| 919 | * |
| 920 | * TCP_ESTABLISHED does cover almost all states where RFS |
| 921 | * might be useful, and is cheaper [1] than testing : |
| 922 | * IPv4: inet_sk(sk)->inet_daddr |
| 923 | * IPv6: ipv6_addr_any(&sk->sk_v6_daddr) |
| 924 | * OR an additional socket flag |
| 925 | * [1] : sk_state and sk_prot are in the same cache line. |
| 926 | */ |
| 927 | if (sk->sk_state == TCP_ESTABLISHED) |
| 928 | sock_rps_record_flow_hash(sk->sk_rxhash); |
| 929 | } |
Zhi Yong Wu | c9d8ca0 | 2014-01-01 04:31:01 +0800 | [diff] [blame] | 930 | #endif |
Tom Herbert | fe47755 | 2013-12-22 18:54:31 +0800 | [diff] [blame] | 931 | } |
| 932 | |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 933 | static inline void sock_rps_save_rxhash(struct sock *sk, |
| 934 | const struct sk_buff *skb) |
David S. Miller | c58dc01 | 2010-04-27 15:05:31 -0700 | [diff] [blame] | 935 | { |
| 936 | #ifdef CONFIG_RPS |
Eric Dumazet | 567e4b7 | 2015-02-06 12:59:01 -0800 | [diff] [blame] | 937 | if (unlikely(sk->sk_rxhash != skb->hash)) |
Tom Herbert | 61b905d | 2014-03-24 15:34:47 -0700 | [diff] [blame] | 938 | sk->sk_rxhash = skb->hash; |
David S. Miller | c58dc01 | 2010-04-27 15:05:31 -0700 | [diff] [blame] | 939 | #endif |
| 940 | } |
| 941 | |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 942 | static inline void sock_rps_reset_rxhash(struct sock *sk) |
| 943 | { |
| 944 | #ifdef CONFIG_RPS |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 945 | sk->sk_rxhash = 0; |
| 946 | #endif |
| 947 | } |
| 948 | |
WANG Cong | d9dc8b0 | 2016-11-11 10:20:50 -0800 | [diff] [blame] | 949 | #define sk_wait_event(__sk, __timeo, __condition, __wait) \ |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 950 | ({ int __rc; \ |
| 951 | release_sock(__sk); \ |
| 952 | __rc = __condition; \ |
| 953 | if (!__rc) { \ |
WANG Cong | d9dc8b0 | 2016-11-11 10:20:50 -0800 | [diff] [blame] | 954 | *(__timeo) = wait_woken(__wait, \ |
| 955 | TASK_INTERRUPTIBLE, \ |
| 956 | *(__timeo)); \ |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 957 | } \ |
WANG Cong | d9dc8b0 | 2016-11-11 10:20:50 -0800 | [diff] [blame] | 958 | sched_annotate_sleep(); \ |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 959 | lock_sock(__sk); \ |
| 960 | __rc = __condition; \ |
| 961 | __rc; \ |
| 962 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 964 | int sk_stream_wait_connect(struct sock *sk, long *timeo_p); |
| 965 | int sk_stream_wait_memory(struct sock *sk, long *timeo_p); |
| 966 | void sk_stream_wait_close(struct sock *sk, long timeo_p); |
| 967 | int sk_stream_error(struct sock *sk, int flags, int err); |
| 968 | void sk_stream_kill_queues(struct sock *sk); |
| 969 | void sk_set_memalloc(struct sock *sk); |
| 970 | void sk_clear_memalloc(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | |
Eric Dumazet | d41a69f | 2016-04-29 14:16:53 -0700 | [diff] [blame] | 972 | void __sk_flush_backlog(struct sock *sk); |
| 973 | |
| 974 | static inline bool sk_flush_backlog(struct sock *sk) |
| 975 | { |
| 976 | if (unlikely(READ_ONCE(sk->sk_backlog.tail))) { |
| 977 | __sk_flush_backlog(sk); |
| 978 | return true; |
| 979 | } |
| 980 | return false; |
| 981 | } |
| 982 | |
Sabrina Dubroca | dfbafc9 | 2015-07-24 18:19:25 +0200 | [diff] [blame] | 983 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 985 | struct request_sock_ops; |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 986 | struct timewait_sock_ops; |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 987 | struct inet_hashinfo; |
Pavel Emelyanov | fc8717b | 2008-03-22 16:56:51 -0700 | [diff] [blame] | 988 | struct raw_hashinfo; |
Paul Gortmaker | de47725 | 2011-05-26 13:46:22 -0400 | [diff] [blame] | 989 | struct module; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 990 | |
Eric Dumazet | f77d602 | 2013-05-09 10:28:16 +0000 | [diff] [blame] | 991 | /* |
| 992 | * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes |
| 993 | * un-modified. Special care is taken when initializing object to zero. |
| 994 | */ |
| 995 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) |
| 996 | { |
| 997 | if (offsetof(struct sock, sk_node.next) != 0) |
| 998 | memset(sk, 0, offsetof(struct sock, sk_node.next)); |
| 999 | memset(&sk->sk_node.pprev, 0, |
| 1000 | size - offsetof(struct sock, sk_node.pprev)); |
| 1001 | } |
| 1002 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | /* Networking protocol blocks we attach to sockets. |
| 1004 | * socket layer -> transport layer interface |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | */ |
| 1006 | struct proto { |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1007 | void (*close)(struct sock *sk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | long timeout); |
| 1009 | int (*connect)(struct sock *sk, |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1010 | struct sockaddr *uaddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | int addr_len); |
| 1012 | int (*disconnect)(struct sock *sk, int flags); |
| 1013 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1014 | struct sock * (*accept)(struct sock *sk, int flags, int *err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | |
| 1016 | int (*ioctl)(struct sock *sk, int cmd, |
| 1017 | unsigned long arg); |
| 1018 | int (*init)(struct sock *sk); |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1019 | void (*destroy)(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | void (*shutdown)(struct sock *sk, int how); |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1021 | int (*setsockopt)(struct sock *sk, int level, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | int optname, char __user *optval, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1023 | unsigned int optlen); |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1024 | int (*getsockopt)(struct sock *sk, int level, |
| 1025 | int optname, char __user *optval, |
| 1026 | int __user *option); |
Alexey Dobriyan | af01d53 | 2008-08-28 02:53:51 -0700 | [diff] [blame] | 1027 | #ifdef CONFIG_COMPAT |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1028 | int (*compat_setsockopt)(struct sock *sk, |
| 1029 | int level, |
| 1030 | int optname, char __user *optval, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1031 | unsigned int optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1032 | int (*compat_getsockopt)(struct sock *sk, |
| 1033 | int level, |
| 1034 | int optname, char __user *optval, |
| 1035 | int __user *option); |
Eric W. Biederman | 709b46e | 2011-01-29 16:15:56 +0000 | [diff] [blame] | 1036 | int (*compat_ioctl)(struct sock *sk, |
| 1037 | unsigned int cmd, unsigned long arg); |
Alexey Dobriyan | af01d53 | 2008-08-28 02:53:51 -0700 | [diff] [blame] | 1038 | #endif |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1039 | int (*sendmsg)(struct sock *sk, struct msghdr *msg, |
| 1040 | size_t len); |
| 1041 | int (*recvmsg)(struct sock *sk, struct msghdr *msg, |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1042 | size_t len, int noblock, int flags, |
| 1043 | int *addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | int (*sendpage)(struct sock *sk, struct page *page, |
| 1045 | int offset, size_t size, int flags); |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1046 | int (*bind)(struct sock *sk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | struct sockaddr *uaddr, int addr_len); |
| 1048 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1049 | int (*backlog_rcv) (struct sock *sk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | struct sk_buff *skb); |
| 1051 | |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 1052 | void (*release_cb)(struct sock *sk); |
| 1053 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | /* Keeping track of sk's, looking them up, and port selection methods. */ |
Craig Gallek | 086c653 | 2016-02-10 11:50:35 -0500 | [diff] [blame] | 1055 | int (*hash)(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | void (*unhash)(struct sock *sk); |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1057 | void (*rehash)(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | int (*get_port)(struct sock *sk, unsigned short snum); |
| 1059 | |
Eric Dumazet | 286ab3d | 2007-11-05 23:38:39 -0800 | [diff] [blame] | 1060 | /* Keeping track of sockets in use */ |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 1061 | #ifdef CONFIG_PROC_FS |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 1062 | unsigned int inuse_idx; |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 1063 | #endif |
Arnaldo Carvalho de Melo | ebb53d7 | 2007-11-21 22:08:50 +0800 | [diff] [blame] | 1064 | |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 1065 | bool (*stream_memory_free)(const struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | /* Memory pressure */ |
Pavel Emelyanov | 5c52ba1 | 2008-07-16 20:28:10 -0700 | [diff] [blame] | 1067 | void (*enter_memory_pressure)(struct sock *sk); |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 1068 | atomic_long_t *memory_allocated; /* Current allocated memory. */ |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 1069 | struct percpu_counter *sockets_allocated; /* Current number of sockets. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | /* |
| 1071 | * Pressure flag: try to collapse. |
| 1072 | * Technical note: it is used by multiple contexts non atomically. |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1073 | * All the __sk_mem_schedule() is of this nature: accounting |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | * is strict, actions are advisory and have some latency. |
| 1075 | */ |
| 1076 | int *memory_pressure; |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 1077 | long *sysctl_mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | int *sysctl_wmem; |
| 1079 | int *sysctl_rmem; |
| 1080 | int max_header; |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 1081 | bool no_autobind; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 1083 | struct kmem_cache *slab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | unsigned int obj_size; |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 1085 | int slab_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 1087 | struct percpu_counter *orphan_count; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1088 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1089 | struct request_sock_ops *rsk_prot; |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 1090 | struct timewait_sock_ops *twsk_prot; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1091 | |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 1092 | union { |
| 1093 | struct inet_hashinfo *hashinfo; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1094 | struct udp_table *udp_table; |
Pavel Emelyanov | fc8717b | 2008-03-22 16:56:51 -0700 | [diff] [blame] | 1095 | struct raw_hashinfo *raw_hash; |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 1096 | } h; |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1097 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | struct module *owner; |
| 1099 | |
| 1100 | char name[32]; |
| 1101 | |
| 1102 | struct list_head node; |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1103 | #ifdef SOCK_REFCNT_DEBUG |
| 1104 | atomic_t socks; |
| 1105 | #endif |
Lorenzo Colitti | 64be0ae | 2015-12-16 12:30:03 +0900 | [diff] [blame] | 1106 | int (*diag_destroy)(struct sock *sk, int err); |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1107 | }; |
| 1108 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1109 | int proto_register(struct proto *prot, int alloc_slab); |
| 1110 | void proto_unregister(struct proto *prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1112 | #ifdef SOCK_REFCNT_DEBUG |
| 1113 | static inline void sk_refcnt_debug_inc(struct sock *sk) |
| 1114 | { |
| 1115 | atomic_inc(&sk->sk_prot->socks); |
| 1116 | } |
| 1117 | |
| 1118 | static inline void sk_refcnt_debug_dec(struct sock *sk) |
| 1119 | { |
| 1120 | atomic_dec(&sk->sk_prot->socks); |
| 1121 | printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", |
| 1122 | sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); |
| 1123 | } |
| 1124 | |
Ying Xue | dec34fb | 2013-02-15 22:28:25 +0000 | [diff] [blame] | 1125 | static inline void sk_refcnt_debug_release(const struct sock *sk) |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1126 | { |
| 1127 | if (atomic_read(&sk->sk_refcnt) != 1) |
| 1128 | printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", |
| 1129 | sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); |
| 1130 | } |
| 1131 | #else /* SOCK_REFCNT_DEBUG */ |
| 1132 | #define sk_refcnt_debug_inc(sk) do { } while (0) |
| 1133 | #define sk_refcnt_debug_dec(sk) do { } while (0) |
| 1134 | #define sk_refcnt_debug_release(sk) do { } while (0) |
| 1135 | #endif /* SOCK_REFCNT_DEBUG */ |
| 1136 | |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 1137 | static inline bool sk_stream_memory_free(const struct sock *sk) |
| 1138 | { |
| 1139 | if (sk->sk_wmem_queued >= sk->sk_sndbuf) |
| 1140 | return false; |
| 1141 | |
| 1142 | return sk->sk_prot->stream_memory_free ? |
| 1143 | sk->sk_prot->stream_memory_free(sk) : true; |
| 1144 | } |
| 1145 | |
Eric Dumazet | 64dc613 | 2013-07-22 20:26:31 -0700 | [diff] [blame] | 1146 | static inline bool sk_stream_is_writeable(const struct sock *sk) |
| 1147 | { |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 1148 | return sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && |
| 1149 | sk_stream_memory_free(sk); |
Eric Dumazet | 64dc613 | 2013-07-22 20:26:31 -0700 | [diff] [blame] | 1150 | } |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1151 | |
Daniel Borkmann | 54fd9c2 | 2016-08-18 01:00:41 +0200 | [diff] [blame] | 1152 | static inline int sk_under_cgroup_hierarchy(struct sock *sk, |
| 1153 | struct cgroup *ancestor) |
| 1154 | { |
| 1155 | #ifdef CONFIG_SOCK_CGROUP_DATA |
| 1156 | return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data), |
| 1157 | ancestor); |
| 1158 | #else |
| 1159 | return -ENOTSUPP; |
| 1160 | #endif |
| 1161 | } |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 1162 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1163 | static inline bool sk_has_memory_pressure(const struct sock *sk) |
| 1164 | { |
| 1165 | return sk->sk_prot->memory_pressure != NULL; |
| 1166 | } |
| 1167 | |
| 1168 | static inline bool sk_under_memory_pressure(const struct sock *sk) |
| 1169 | { |
| 1170 | if (!sk->sk_prot->memory_pressure) |
| 1171 | return false; |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1172 | |
Johannes Weiner | baac50b | 2016-01-14 15:21:17 -0800 | [diff] [blame] | 1173 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
| 1174 | mem_cgroup_under_socket_pressure(sk->sk_memcg)) |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 1175 | return true; |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1176 | |
Christoph Paasch | 35b87f6 | 2013-10-23 12:49:21 -0700 | [diff] [blame] | 1177 | return !!*sk->sk_prot->memory_pressure; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1178 | } |
| 1179 | |
| 1180 | static inline void sk_leave_memory_pressure(struct sock *sk) |
| 1181 | { |
| 1182 | int *memory_pressure = sk->sk_prot->memory_pressure; |
| 1183 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1184 | if (!memory_pressure) |
| 1185 | return; |
| 1186 | |
| 1187 | if (*memory_pressure) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1188 | *memory_pressure = 0; |
| 1189 | } |
| 1190 | |
| 1191 | static inline void sk_enter_memory_pressure(struct sock *sk) |
| 1192 | { |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1193 | if (!sk->sk_prot->enter_memory_pressure) |
| 1194 | return; |
| 1195 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1196 | sk->sk_prot->enter_memory_pressure(sk); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1197 | } |
| 1198 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1199 | static inline long |
| 1200 | sk_memory_allocated(const struct sock *sk) |
| 1201 | { |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 1202 | return atomic_long_read(sk->sk_prot->memory_allocated); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1203 | } |
| 1204 | |
| 1205 | static inline long |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 1206 | sk_memory_allocated_add(struct sock *sk, int amt) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1207 | { |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 1208 | return atomic_long_add_return(amt, sk->sk_prot->memory_allocated); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1209 | } |
| 1210 | |
| 1211 | static inline void |
Glauber Costa | 0e90b31 | 2012-01-20 04:57:16 +0000 | [diff] [blame] | 1212 | sk_memory_allocated_sub(struct sock *sk, int amt) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1213 | { |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 1214 | atomic_long_sub(amt, sk->sk_prot->memory_allocated); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1215 | } |
| 1216 | |
| 1217 | static inline void sk_sockets_allocated_dec(struct sock *sk) |
| 1218 | { |
Johannes Weiner | af95d7d | 2016-01-14 15:21:08 -0800 | [diff] [blame] | 1219 | percpu_counter_dec(sk->sk_prot->sockets_allocated); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1220 | } |
| 1221 | |
| 1222 | static inline void sk_sockets_allocated_inc(struct sock *sk) |
| 1223 | { |
Johannes Weiner | af95d7d | 2016-01-14 15:21:08 -0800 | [diff] [blame] | 1224 | percpu_counter_inc(sk->sk_prot->sockets_allocated); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1225 | } |
| 1226 | |
| 1227 | static inline int |
| 1228 | sk_sockets_allocated_read_positive(struct sock *sk) |
| 1229 | { |
Johannes Weiner | af95d7d | 2016-01-14 15:21:08 -0800 | [diff] [blame] | 1230 | return percpu_counter_read_positive(sk->sk_prot->sockets_allocated); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1231 | } |
| 1232 | |
| 1233 | static inline int |
| 1234 | proto_sockets_allocated_sum_positive(struct proto *prot) |
| 1235 | { |
| 1236 | return percpu_counter_sum_positive(prot->sockets_allocated); |
| 1237 | } |
| 1238 | |
| 1239 | static inline long |
| 1240 | proto_memory_allocated(struct proto *prot) |
| 1241 | { |
| 1242 | return atomic_long_read(prot->memory_allocated); |
| 1243 | } |
| 1244 | |
| 1245 | static inline bool |
| 1246 | proto_memory_pressure(struct proto *prot) |
| 1247 | { |
| 1248 | if (!prot->memory_pressure) |
| 1249 | return false; |
| 1250 | return !!*prot->memory_pressure; |
| 1251 | } |
| 1252 | |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 1253 | |
| 1254 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | /* Called with local bh disabled */ |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1256 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); |
| 1257 | int sock_prot_inuse_get(struct net *net, struct proto *proto); |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 1258 | #else |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1259 | static inline void sock_prot_inuse_add(struct net *net, struct proto *prot, |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 1260 | int inc) |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 1261 | { |
| 1262 | } |
Eric Dumazet | 65f7651 | 2008-01-03 20:46:48 -0800 | [diff] [blame] | 1263 | #endif |
| 1264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
Arnaldo Carvalho de Melo | 614c6cb | 2005-08-09 19:47:37 -0700 | [diff] [blame] | 1266 | /* With per-bucket locks this operation is not-atomic, so that |
| 1267 | * this version is not worse. |
| 1268 | */ |
Craig Gallek | 086c653 | 2016-02-10 11:50:35 -0500 | [diff] [blame] | 1269 | static inline int __sk_prot_rehash(struct sock *sk) |
Arnaldo Carvalho de Melo | 614c6cb | 2005-08-09 19:47:37 -0700 | [diff] [blame] | 1270 | { |
| 1271 | sk->sk_prot->unhash(sk); |
Craig Gallek | 086c653 | 2016-02-10 11:50:35 -0500 | [diff] [blame] | 1272 | return sk->sk_prot->hash(sk); |
Arnaldo Carvalho de Melo | 614c6cb | 2005-08-09 19:47:37 -0700 | [diff] [blame] | 1273 | } |
| 1274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | /* About 10 seconds */ |
| 1276 | #define SOCK_DESTROY_TIME (10*HZ) |
| 1277 | |
| 1278 | /* Sockets 0-1023 can't be bound to unless you are superuser */ |
| 1279 | #define PROT_SOCK 1024 |
| 1280 | |
| 1281 | #define SHUTDOWN_MASK 3 |
| 1282 | #define RCV_SHUTDOWN 1 |
| 1283 | #define SEND_SHUTDOWN 2 |
| 1284 | |
| 1285 | #define SOCK_SNDBUF_LOCK 1 |
| 1286 | #define SOCK_RCVBUF_LOCK 2 |
| 1287 | #define SOCK_BINDADDR_LOCK 4 |
| 1288 | #define SOCK_BINDPORT_LOCK 8 |
| 1289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | struct socket_alloc { |
| 1291 | struct socket socket; |
| 1292 | struct inode vfs_inode; |
| 1293 | }; |
| 1294 | |
| 1295 | static inline struct socket *SOCKET_I(struct inode *inode) |
| 1296 | { |
| 1297 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket; |
| 1298 | } |
| 1299 | |
| 1300 | static inline struct inode *SOCK_INODE(struct socket *socket) |
| 1301 | { |
| 1302 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode; |
| 1303 | } |
| 1304 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1305 | /* |
| 1306 | * Functions for memory accounting |
| 1307 | */ |
Paolo Abeni | f8c3bf0 | 2016-10-21 13:55:45 +0200 | [diff] [blame] | 1308 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind); |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1309 | int __sk_mem_schedule(struct sock *sk, int size, int kind); |
Paolo Abeni | f8c3bf0 | 2016-10-21 13:55:45 +0200 | [diff] [blame] | 1310 | void __sk_mem_reduce_allocated(struct sock *sk, int amount); |
Eric Dumazet | 1a24e04 | 2015-05-15 12:39:25 -0700 | [diff] [blame] | 1311 | void __sk_mem_reclaim(struct sock *sk, int amount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | |
Eric Dumazet | bd68a2a | 2016-10-31 13:32:55 -0700 | [diff] [blame] | 1313 | /* We used to have PAGE_SIZE here, but systems with 64KB pages |
| 1314 | * do not necessarily have 16x time more memory than 4KB ones. |
| 1315 | */ |
| 1316 | #define SK_MEM_QUANTUM 4096 |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1317 | #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) |
| 1318 | #define SK_MEM_SEND 0 |
| 1319 | #define SK_MEM_RECV 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | |
Eric Dumazet | bd68a2a | 2016-10-31 13:32:55 -0700 | [diff] [blame] | 1321 | /* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */ |
| 1322 | static inline long sk_prot_mem_limits(const struct sock *sk, int index) |
| 1323 | { |
| 1324 | long val = sk->sk_prot->sysctl_mem[index]; |
| 1325 | |
| 1326 | #if PAGE_SIZE > SK_MEM_QUANTUM |
| 1327 | val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT; |
| 1328 | #elif PAGE_SIZE < SK_MEM_QUANTUM |
| 1329 | val >>= SK_MEM_QUANTUM_SHIFT - PAGE_SHIFT; |
| 1330 | #endif |
| 1331 | return val; |
| 1332 | } |
| 1333 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1334 | static inline int sk_mem_pages(int amt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1336 | return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | } |
| 1338 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1339 | static inline bool sk_has_account(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1341 | /* return true if protocol supports memory accounting */ |
| 1342 | return !!sk->sk_prot->memory_allocated; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | } |
| 1344 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1345 | static inline bool sk_wmem_schedule(struct sock *sk, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1347 | if (!sk_has_account(sk)) |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1348 | return true; |
Herbert Xu | d80d99d | 2005-09-01 17:48:23 -0700 | [diff] [blame] | 1349 | return size <= sk->sk_forward_alloc || |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1350 | __sk_mem_schedule(sk, size, SK_MEM_SEND); |
| 1351 | } |
| 1352 | |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 1353 | static inline bool |
Chuck Lever | 35c448a | 2012-09-17 14:09:11 -0700 | [diff] [blame] | 1354 | sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1355 | { |
| 1356 | if (!sk_has_account(sk)) |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1357 | return true; |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 1358 | return size<= sk->sk_forward_alloc || |
| 1359 | __sk_mem_schedule(sk, size, SK_MEM_RECV) || |
| 1360 | skb_pfmemalloc(skb); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1361 | } |
| 1362 | |
| 1363 | static inline void sk_mem_reclaim(struct sock *sk) |
| 1364 | { |
| 1365 | if (!sk_has_account(sk)) |
| 1366 | return; |
| 1367 | if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) |
Eric Dumazet | 1a24e04 | 2015-05-15 12:39:25 -0700 | [diff] [blame] | 1368 | __sk_mem_reclaim(sk, sk->sk_forward_alloc); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1369 | } |
| 1370 | |
David S. Miller | 9993e7d | 2008-01-10 21:56:38 -0800 | [diff] [blame] | 1371 | static inline void sk_mem_reclaim_partial(struct sock *sk) |
| 1372 | { |
| 1373 | if (!sk_has_account(sk)) |
| 1374 | return; |
| 1375 | if (sk->sk_forward_alloc > SK_MEM_QUANTUM) |
Eric Dumazet | 1a24e04 | 2015-05-15 12:39:25 -0700 | [diff] [blame] | 1376 | __sk_mem_reclaim(sk, sk->sk_forward_alloc - 1); |
David S. Miller | 9993e7d | 2008-01-10 21:56:38 -0800 | [diff] [blame] | 1377 | } |
| 1378 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1379 | static inline void sk_mem_charge(struct sock *sk, int size) |
| 1380 | { |
| 1381 | if (!sk_has_account(sk)) |
| 1382 | return; |
| 1383 | sk->sk_forward_alloc -= size; |
| 1384 | } |
| 1385 | |
| 1386 | static inline void sk_mem_uncharge(struct sock *sk, int size) |
| 1387 | { |
| 1388 | if (!sk_has_account(sk)) |
| 1389 | return; |
| 1390 | sk->sk_forward_alloc += size; |
Eric Dumazet | 20c64d5 | 2016-09-15 08:48:46 -0700 | [diff] [blame] | 1391 | |
| 1392 | /* Avoid a possible overflow. |
| 1393 | * TCP send queues can make this happen, if sk_mem_reclaim() |
| 1394 | * is not called and more than 2 GBytes are released at once. |
| 1395 | * |
| 1396 | * If we reach 2 MBytes, reclaim 1 MBytes right now, there is |
| 1397 | * no need to hold that much forward allocation anyway. |
| 1398 | */ |
| 1399 | if (unlikely(sk->sk_forward_alloc >= 1 << 21)) |
| 1400 | __sk_mem_reclaim(sk, 1 << 20); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1401 | } |
| 1402 | |
| 1403 | static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) |
| 1404 | { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1405 | sock_set_flag(sk, SOCK_QUEUE_SHRUNK); |
| 1406 | sk->sk_wmem_queued -= skb->truesize; |
| 1407 | sk_mem_uncharge(sk, skb->truesize); |
| 1408 | __kfree_skb(skb); |
Herbert Xu | d80d99d | 2005-09-01 17:48:23 -0700 | [diff] [blame] | 1409 | } |
| 1410 | |
Eric Dumazet | c3f9b01 | 2014-03-10 09:50:11 -0700 | [diff] [blame] | 1411 | static inline void sock_release_ownership(struct sock *sk) |
| 1412 | { |
Hannes Frederic Sowa | 61881cf | 2016-04-05 17:10:14 +0200 | [diff] [blame] | 1413 | if (sk->sk_lock.owned) { |
| 1414 | sk->sk_lock.owned = 0; |
| 1415 | |
| 1416 | /* The sk_lock has mutex_unlock() semantics: */ |
| 1417 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
| 1418 | } |
Eric Dumazet | c3f9b01 | 2014-03-10 09:50:11 -0700 | [diff] [blame] | 1419 | } |
| 1420 | |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1421 | /* |
| 1422 | * Macro so as to not evaluate some arguments when |
| 1423 | * lockdep is not enabled. |
| 1424 | * |
| 1425 | * Mark both the sk_lock and the sk_lock.slock as a |
| 1426 | * per-address-family lock class. |
| 1427 | */ |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1428 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1429 | do { \ |
Ingo Molnar | e8f6fbf | 2008-11-12 01:38:36 +0000 | [diff] [blame] | 1430 | sk->sk_lock.owned = 0; \ |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1431 | init_waitqueue_head(&sk->sk_lock.wq); \ |
| 1432 | spin_lock_init(&(sk)->sk_lock.slock); \ |
| 1433 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ |
| 1434 | sizeof((sk)->sk_lock)); \ |
| 1435 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1436 | (skey), (sname)); \ |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1437 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ |
| 1438 | } while (0) |
| 1439 | |
David S. Miller | b33b0a1 | 2016-04-07 20:40:25 -0400 | [diff] [blame] | 1440 | #ifdef CONFIG_LOCKDEP |
Hannes Frederic Sowa | 03be982 | 2016-04-07 23:53:35 +0200 | [diff] [blame] | 1441 | static inline bool lockdep_sock_is_held(const struct sock *csk) |
Hannes Frederic Sowa | 1e1d04e | 2016-04-05 17:10:15 +0200 | [diff] [blame] | 1442 | { |
| 1443 | struct sock *sk = (struct sock *)csk; |
| 1444 | |
| 1445 | return lockdep_is_held(&sk->sk_lock) || |
| 1446 | lockdep_is_held(&sk->sk_lock.slock); |
| 1447 | } |
David S. Miller | b33b0a1 | 2016-04-07 20:40:25 -0400 | [diff] [blame] | 1448 | #endif |
Hannes Frederic Sowa | 1e1d04e | 2016-04-05 17:10:15 +0200 | [diff] [blame] | 1449 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1450 | void lock_sock_nested(struct sock *sk, int subclass); |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 1451 | |
| 1452 | static inline void lock_sock(struct sock *sk) |
| 1453 | { |
| 1454 | lock_sock_nested(sk, 0); |
| 1455 | } |
| 1456 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1457 | void release_sock(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | |
| 1459 | /* BH context may only use the following locking interface. */ |
| 1460 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) |
Ingo Molnar | c636618 | 2006-07-03 00:25:13 -0700 | [diff] [blame] | 1461 | #define bh_lock_sock_nested(__sk) \ |
| 1462 | spin_lock_nested(&((__sk)->sk_lock.slock), \ |
| 1463 | SINGLE_DEPTH_NESTING) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) |
| 1465 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1466 | bool lock_sock_fast(struct sock *sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1467 | /** |
| 1468 | * unlock_sock_fast - complement of lock_sock_fast |
| 1469 | * @sk: socket |
| 1470 | * @slow: slow mode |
| 1471 | * |
| 1472 | * fast unlock socket for user context. |
| 1473 | * If slow mode is on, we call regular release_sock() |
| 1474 | */ |
| 1475 | static inline void unlock_sock_fast(struct sock *sk, bool slow) |
Eric Dumazet | 4b0b72f | 2010-04-28 14:35:48 -0700 | [diff] [blame] | 1476 | { |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1477 | if (slow) |
| 1478 | release_sock(sk); |
| 1479 | else |
| 1480 | spin_unlock_bh(&sk->sk_lock.slock); |
Eric Dumazet | 4b0b72f | 2010-04-28 14:35:48 -0700 | [diff] [blame] | 1481 | } |
| 1482 | |
Hannes Frederic Sowa | fafc4e1 | 2016-04-08 15:11:27 +0200 | [diff] [blame] | 1483 | /* Used by processes to "lock" a socket state, so that |
| 1484 | * interrupts and bottom half handlers won't change it |
| 1485 | * from under us. It essentially blocks any incoming |
| 1486 | * packets, so that we won't get any new data or any |
| 1487 | * packets that change the state of the socket. |
| 1488 | * |
| 1489 | * While locked, BH processing will add new packets to |
| 1490 | * the backlog queue. This queue is processed by the |
| 1491 | * owner of the socket lock right before it is released. |
| 1492 | * |
| 1493 | * Since ~2.3.5 it is also exclusive sleep lock serializing |
| 1494 | * accesses from user process context. |
| 1495 | */ |
| 1496 | |
Eric Dumazet | 46cc6e4 | 2016-05-03 16:56:03 -0700 | [diff] [blame] | 1497 | static inline void sock_owned_by_me(const struct sock *sk) |
Hannes Frederic Sowa | fafc4e1 | 2016-04-08 15:11:27 +0200 | [diff] [blame] | 1498 | { |
| 1499 | #ifdef CONFIG_LOCKDEP |
Eric Dumazet | 5e91f6c | 2016-04-25 06:34:09 -0700 | [diff] [blame] | 1500 | WARN_ON_ONCE(!lockdep_sock_is_held(sk) && debug_locks); |
Hannes Frederic Sowa | fafc4e1 | 2016-04-08 15:11:27 +0200 | [diff] [blame] | 1501 | #endif |
Eric Dumazet | 46cc6e4 | 2016-05-03 16:56:03 -0700 | [diff] [blame] | 1502 | } |
| 1503 | |
| 1504 | static inline bool sock_owned_by_user(const struct sock *sk) |
| 1505 | { |
| 1506 | sock_owned_by_me(sk); |
Hannes Frederic Sowa | fafc4e1 | 2016-04-08 15:11:27 +0200 | [diff] [blame] | 1507 | return sk->sk_lock.owned; |
| 1508 | } |
| 1509 | |
| 1510 | /* no reclassification while locks are held */ |
| 1511 | static inline bool sock_allow_reclassification(const struct sock *csk) |
| 1512 | { |
| 1513 | struct sock *sk = (struct sock *)csk; |
| 1514 | |
| 1515 | return !sk->sk_lock.owned && !spin_is_locked(&sk->sk_lock.slock); |
| 1516 | } |
Eric Dumazet | 4b0b72f | 2010-04-28 14:35:48 -0700 | [diff] [blame] | 1517 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1518 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 1519 | struct proto *prot, int kern); |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1520 | void sk_free(struct sock *sk); |
Craig Gallek | eb4cb00 | 2015-06-15 11:26:18 -0400 | [diff] [blame] | 1521 | void sk_destruct(struct sock *sk); |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1522 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1524 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
| 1525 | gfp_t priority); |
Eric Dumazet | 1d2077a | 2016-05-02 10:56:27 -0700 | [diff] [blame] | 1526 | void __sock_wfree(struct sk_buff *skb); |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1527 | void sock_wfree(struct sk_buff *skb); |
| 1528 | void skb_orphan_partial(struct sk_buff *skb); |
| 1529 | void sock_rfree(struct sk_buff *skb); |
Alexander Duyck | 62bccb8 | 2014-09-04 13:31:35 -0400 | [diff] [blame] | 1530 | void sock_efree(struct sk_buff *skb); |
Alexander Duyck | 82eabd9 | 2014-09-04 13:32:11 -0400 | [diff] [blame] | 1531 | #ifdef CONFIG_INET |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1532 | void sock_edemux(struct sk_buff *skb); |
Alexander Duyck | 82eabd9 | 2014-09-04 13:32:11 -0400 | [diff] [blame] | 1533 | #else |
| 1534 | #define sock_edemux(skb) sock_efree(skb) |
| 1535 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1537 | int sock_setsockopt(struct socket *sock, int level, int op, |
| 1538 | char __user *optval, unsigned int optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1540 | int sock_getsockopt(struct socket *sock, int level, int op, |
| 1541 | char __user *optval, int __user *optlen); |
| 1542 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
| 1543 | int noblock, int *errcode); |
| 1544 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
| 1545 | unsigned long data_len, int noblock, |
| 1546 | int *errcode, int max_page_order); |
| 1547 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority); |
| 1548 | void sock_kfree_s(struct sock *sk, void *mem, int size); |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1549 | void sock_kzfree_s(struct sock *sk, void *mem, int size); |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1550 | void sk_send_sigurg(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | |
Edward Jee | f28ea36 | 2015-10-08 14:56:48 -0700 | [diff] [blame] | 1552 | struct sockcm_cookie { |
| 1553 | u32 mark; |
Soheil Hassas Yeganeh | 3dd17e6 | 2016-04-02 23:08:09 -0400 | [diff] [blame] | 1554 | u16 tsflags; |
Edward Jee | f28ea36 | 2015-10-08 14:56:48 -0700 | [diff] [blame] | 1555 | }; |
| 1556 | |
Willem de Bruijn | 39771b1 | 2016-04-02 23:08:06 -0400 | [diff] [blame] | 1557 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
| 1558 | struct sockcm_cookie *sockc); |
Edward Jee | f28ea36 | 2015-10-08 14:56:48 -0700 | [diff] [blame] | 1559 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
| 1560 | struct sockcm_cookie *sockc); |
| 1561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | /* |
| 1563 | * Functions to fill in entries in struct proto_ops when a protocol |
| 1564 | * does not implement a particular function. |
| 1565 | */ |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1566 | int sock_no_bind(struct socket *, struct sockaddr *, int); |
| 1567 | int sock_no_connect(struct socket *, struct sockaddr *, int, int); |
| 1568 | int sock_no_socketpair(struct socket *, struct socket *); |
| 1569 | int sock_no_accept(struct socket *, struct socket *, int); |
| 1570 | int sock_no_getname(struct socket *, struct sockaddr *, int *, int); |
| 1571 | unsigned int sock_no_poll(struct file *, struct socket *, |
| 1572 | struct poll_table_struct *); |
| 1573 | int sock_no_ioctl(struct socket *, unsigned int, unsigned long); |
| 1574 | int sock_no_listen(struct socket *, int); |
| 1575 | int sock_no_shutdown(struct socket *, int); |
| 1576 | int sock_no_getsockopt(struct socket *, int , int, char __user *, int __user *); |
| 1577 | int sock_no_setsockopt(struct socket *, int, int, char __user *, unsigned int); |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1578 | int sock_no_sendmsg(struct socket *, struct msghdr *, size_t); |
| 1579 | int sock_no_recvmsg(struct socket *, struct msghdr *, size_t, int); |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1580 | int sock_no_mmap(struct file *file, struct socket *sock, |
| 1581 | struct vm_area_struct *vma); |
| 1582 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, |
| 1583 | size_t size, int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | |
| 1585 | /* |
| 1586 | * Functions to fill in entries in struct proto_ops when a protocol |
| 1587 | * uses the inet style. |
| 1588 | */ |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1589 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | char __user *optval, int __user *optlen); |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1591 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
| 1592 | int flags); |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1593 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1594 | char __user *optval, unsigned int optlen); |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1595 | int compat_sock_common_getsockopt(struct socket *sock, int level, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1596 | int optname, char __user *optval, int __user *optlen); |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1597 | int compat_sock_common_setsockopt(struct socket *sock, int level, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1598 | int optname, char __user *optval, unsigned int optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1600 | void sk_common_release(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | |
| 1602 | /* |
| 1603 | * Default socket callbacks and setup code |
| 1604 | */ |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | /* Initialise core socket variables */ |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1607 | void sock_init_data(struct socket *sock, struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | /* |
| 1610 | * Socket reference counting postulates. |
| 1611 | * |
| 1612 | * * Each user of socket SHOULD hold a reference count. |
| 1613 | * * Each access point to socket (an hash table bucket, reference from a list, |
| 1614 | * running timer, skb in flight MUST hold a reference count. |
| 1615 | * * When reference count hits 0, it means it will never increase back. |
| 1616 | * * When reference count hits 0, it means that no references from |
| 1617 | * outside exist to this socket and current process on current CPU |
| 1618 | * is last user and may/should destroy this socket. |
| 1619 | * * sk_free is called from any context: process, BH, IRQ. When |
| 1620 | * it is called, socket has no references from outside -> sk_free |
| 1621 | * may release descendant resources allocated by the socket, but |
| 1622 | * to the time when it is called, socket is NOT referenced by any |
| 1623 | * hash tables, lists etc. |
| 1624 | * * Packets, delivered from outside (from network or from another process) |
| 1625 | * and enqueued on receive/error queues SHOULD NOT grab reference count, |
| 1626 | * when they sit in queue. Otherwise, packets will leak to hole, when |
| 1627 | * socket is looked up by one cpu and unhasing is made by another CPU. |
| 1628 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp |
| 1629 | * (leak to backlog). Packet socket does all the processing inside |
| 1630 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets |
| 1631 | * use separate SMP lock, so that they are prone too. |
| 1632 | */ |
| 1633 | |
| 1634 | /* Ungrab socket and destroy it, if it was the last reference. */ |
| 1635 | static inline void sock_put(struct sock *sk) |
| 1636 | { |
| 1637 | if (atomic_dec_and_test(&sk->sk_refcnt)) |
| 1638 | sk_free(sk); |
| 1639 | } |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1640 | /* Generic version of sock_put(), dealing with all sockets |
Eric Dumazet | 41b822c | 2015-03-12 16:44:08 -0700 | [diff] [blame] | 1641 | * (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...) |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1642 | */ |
| 1643 | void sock_gen_put(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | |
Willem de Bruijn | 4f0c40d9 | 2016-07-12 18:18:57 -0400 | [diff] [blame] | 1645 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested, |
Eric Dumazet | c3f24cf | 2016-11-02 17:14:41 -0700 | [diff] [blame] | 1646 | unsigned int trim_cap, bool refcounted); |
Willem de Bruijn | 4f0c40d9 | 2016-07-12 18:18:57 -0400 | [diff] [blame] | 1647 | static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
| 1648 | const int nested) |
| 1649 | { |
Eric Dumazet | c3f24cf | 2016-11-02 17:14:41 -0700 | [diff] [blame] | 1650 | return __sk_receive_skb(sk, skb, nested, 1, true); |
Willem de Bruijn | 4f0c40d9 | 2016-07-12 18:18:57 -0400 | [diff] [blame] | 1651 | } |
Arnaldo Carvalho de Melo | 25995ff | 2005-12-27 02:42:22 -0200 | [diff] [blame] | 1652 | |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1653 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue) |
| 1654 | { |
| 1655 | sk->sk_tx_queue_mapping = tx_queue; |
| 1656 | } |
| 1657 | |
| 1658 | static inline void sk_tx_queue_clear(struct sock *sk) |
| 1659 | { |
| 1660 | sk->sk_tx_queue_mapping = -1; |
| 1661 | } |
| 1662 | |
| 1663 | static inline int sk_tx_queue_get(const struct sock *sk) |
| 1664 | { |
Tom Herbert | b0f77d0 | 2010-07-14 20:50:29 -0700 | [diff] [blame] | 1665 | return sk ? sk->sk_tx_queue_mapping : -1; |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1666 | } |
| 1667 | |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1668 | static inline void sk_set_socket(struct sock *sk, struct socket *sock) |
| 1669 | { |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1670 | sk_tx_queue_clear(sk); |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1671 | sk->sk_socket = sock; |
| 1672 | } |
| 1673 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1674 | static inline wait_queue_head_t *sk_sleep(struct sock *sk) |
| 1675 | { |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 1676 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0); |
| 1677 | return &rcu_dereference_raw(sk->sk_wq)->wait; |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1678 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | /* Detach socket from process context. |
| 1680 | * Announce socket dead, detach it from wait queue and inode. |
| 1681 | * Note that parent inode held reference count on this struct sock, |
| 1682 | * we do not release it in this function, because protocol |
| 1683 | * probably wants some additional cleanups or even continuing |
| 1684 | * to work with this socket (TCP). |
| 1685 | */ |
| 1686 | static inline void sock_orphan(struct sock *sk) |
| 1687 | { |
| 1688 | write_lock_bh(&sk->sk_callback_lock); |
| 1689 | sock_set_flag(sk, SOCK_DEAD); |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1690 | sk_set_socket(sk, NULL); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1691 | sk->sk_wq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | write_unlock_bh(&sk->sk_callback_lock); |
| 1693 | } |
| 1694 | |
| 1695 | static inline void sock_graft(struct sock *sk, struct socket *parent) |
| 1696 | { |
| 1697 | write_lock_bh(&sk->sk_callback_lock); |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 1698 | sk->sk_wq = parent->wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | parent->sk = sk; |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1700 | sk_set_socket(sk, parent); |
Lorenzo Colitti | 86741ec | 2016-11-04 02:23:41 +0900 | [diff] [blame] | 1701 | sk->sk_uid = SOCK_INODE(parent)->i_uid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 1702 | security_sock_graft(sk, parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | write_unlock_bh(&sk->sk_callback_lock); |
| 1704 | } |
| 1705 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1706 | kuid_t sock_i_uid(struct sock *sk); |
| 1707 | unsigned long sock_i_ino(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | |
Lorenzo Colitti | 86741ec | 2016-11-04 02:23:41 +0900 | [diff] [blame] | 1709 | static inline kuid_t sock_net_uid(const struct net *net, const struct sock *sk) |
| 1710 | { |
| 1711 | return sk ? sk->sk_uid : make_kuid(net->user_ns, 0); |
| 1712 | } |
| 1713 | |
Eric Dumazet | 58d607d | 2015-09-15 15:24:20 -0700 | [diff] [blame] | 1714 | static inline u32 net_tx_rndhash(void) |
| 1715 | { |
| 1716 | u32 v = prandom_u32(); |
| 1717 | |
| 1718 | return v ?: 1; |
| 1719 | } |
| 1720 | |
Tom Herbert | 877d1f6 | 2015-07-28 16:02:05 -0700 | [diff] [blame] | 1721 | static inline void sk_set_txhash(struct sock *sk) |
| 1722 | { |
Eric Dumazet | 58d607d | 2015-09-15 15:24:20 -0700 | [diff] [blame] | 1723 | sk->sk_txhash = net_tx_rndhash(); |
Tom Herbert | 877d1f6 | 2015-07-28 16:02:05 -0700 | [diff] [blame] | 1724 | } |
| 1725 | |
Tom Herbert | 265f94f | 2015-07-28 16:02:06 -0700 | [diff] [blame] | 1726 | static inline void sk_rethink_txhash(struct sock *sk) |
| 1727 | { |
| 1728 | if (sk->sk_txhash) |
| 1729 | sk_set_txhash(sk); |
| 1730 | } |
| 1731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | static inline struct dst_entry * |
| 1733 | __sk_dst_get(struct sock *sk) |
| 1734 | { |
Hannes Frederic Sowa | 1e1d04e | 2016-04-05 17:10:15 +0200 | [diff] [blame] | 1735 | return rcu_dereference_check(sk->sk_dst_cache, |
| 1736 | lockdep_sock_is_held(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | } |
| 1738 | |
| 1739 | static inline struct dst_entry * |
| 1740 | sk_dst_get(struct sock *sk) |
| 1741 | { |
| 1742 | struct dst_entry *dst; |
| 1743 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1744 | rcu_read_lock(); |
| 1745 | dst = rcu_dereference(sk->sk_dst_cache); |
Eric Dumazet | f886497 | 2014-06-24 10:05:11 -0700 | [diff] [blame] | 1746 | if (dst && !atomic_inc_not_zero(&dst->__refcnt)) |
| 1747 | dst = NULL; |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1748 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | return dst; |
| 1750 | } |
| 1751 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1752 | static inline void dst_negative_advice(struct sock *sk) |
| 1753 | { |
| 1754 | struct dst_entry *ndst, *dst = __sk_dst_get(sk); |
| 1755 | |
Tom Herbert | 265f94f | 2015-07-28 16:02:06 -0700 | [diff] [blame] | 1756 | sk_rethink_txhash(sk); |
| 1757 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1758 | if (dst && dst->ops->negative_advice) { |
| 1759 | ndst = dst->ops->negative_advice(dst); |
| 1760 | |
| 1761 | if (ndst != dst) { |
| 1762 | rcu_assign_pointer(sk->sk_dst_cache, ndst); |
ZHAO Gang | 0a6957e | 2013-10-22 16:23:38 +0800 | [diff] [blame] | 1763 | sk_tx_queue_clear(sk); |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1764 | } |
| 1765 | } |
| 1766 | } |
| 1767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | static inline void |
| 1769 | __sk_dst_set(struct sock *sk, struct dst_entry *dst) |
| 1770 | { |
| 1771 | struct dst_entry *old_dst; |
| 1772 | |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1773 | sk_tx_queue_clear(sk); |
Eric Dumazet | 0b53ff2 | 2010-04-26 20:40:43 +0000 | [diff] [blame] | 1774 | /* |
| 1775 | * This can be called while sk is owned by the caller only, |
| 1776 | * with no state that can be checked in a rcu_dereference_check() cond |
| 1777 | */ |
| 1778 | old_dst = rcu_dereference_raw(sk->sk_dst_cache); |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1779 | rcu_assign_pointer(sk->sk_dst_cache, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | dst_release(old_dst); |
| 1781 | } |
| 1782 | |
| 1783 | static inline void |
| 1784 | sk_dst_set(struct sock *sk, struct dst_entry *dst) |
| 1785 | { |
Eric Dumazet | 7f50236 | 2014-06-30 01:26:23 -0700 | [diff] [blame] | 1786 | struct dst_entry *old_dst; |
| 1787 | |
| 1788 | sk_tx_queue_clear(sk); |
Eric Dumazet | 5925a05 | 2014-07-02 02:39:38 -0700 | [diff] [blame] | 1789 | old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst); |
Eric Dumazet | 7f50236 | 2014-06-30 01:26:23 -0700 | [diff] [blame] | 1790 | dst_release(old_dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | } |
| 1792 | |
| 1793 | static inline void |
| 1794 | __sk_dst_reset(struct sock *sk) |
| 1795 | { |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1796 | __sk_dst_set(sk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | } |
| 1798 | |
| 1799 | static inline void |
| 1800 | sk_dst_reset(struct sock *sk) |
| 1801 | { |
Eric Dumazet | 7f50236 | 2014-06-30 01:26:23 -0700 | [diff] [blame] | 1802 | sk_dst_set(sk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | } |
| 1804 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1805 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1807 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | |
hannes@stressinduktion.org | f60e599 | 2015-04-01 17:07:44 +0200 | [diff] [blame] | 1809 | bool sk_mc_loop(struct sock *sk); |
| 1810 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1811 | static inline bool sk_can_gso(const struct sock *sk) |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 1812 | { |
| 1813 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); |
| 1814 | } |
| 1815 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 1816 | 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] | 1817 | |
Michał Mirosław | c8f44af | 2011-11-15 15:29:55 +0000 | [diff] [blame] | 1818 | static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags) |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1819 | { |
| 1820 | sk->sk_route_nocaps |= flags; |
| 1821 | sk->sk_route_caps &= ~flags; |
| 1822 | } |
| 1823 | |
Tom Herbert | 9a49850 | 2015-12-14 11:19:45 -0800 | [diff] [blame] | 1824 | static inline bool sk_check_csum_caps(struct sock *sk) |
| 1825 | { |
| 1826 | return (sk->sk_route_caps & NETIF_F_HW_CSUM) || |
| 1827 | (sk->sk_family == PF_INET && |
| 1828 | (sk->sk_route_caps & NETIF_F_IP_CSUM)) || |
| 1829 | (sk->sk_family == PF_INET6 && |
| 1830 | (sk->sk_route_caps & NETIF_F_IPV6_CSUM)); |
| 1831 | } |
| 1832 | |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1833 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1834 | struct iov_iter *from, char *to, |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1835 | int copy, int offset) |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1836 | { |
| 1837 | if (skb->ip_summed == CHECKSUM_NONE) { |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1838 | __wsum csum = 0; |
Al Viro | 15e6cb4 | 2016-11-01 22:42:45 -0400 | [diff] [blame] | 1839 | if (!csum_and_copy_from_iter_full(to, copy, &csum, from)) |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1840 | return -EFAULT; |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1841 | skb->csum = csum_block_add(skb->csum, csum, offset); |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1842 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { |
Al Viro | 15e6cb4 | 2016-11-01 22:42:45 -0400 | [diff] [blame] | 1843 | if (!copy_from_iter_full_nocache(to, copy, from)) |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1844 | return -EFAULT; |
Al Viro | 15e6cb4 | 2016-11-01 22:42:45 -0400 | [diff] [blame] | 1845 | } else if (!copy_from_iter_full(to, copy, from)) |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1846 | return -EFAULT; |
| 1847 | |
| 1848 | return 0; |
| 1849 | } |
| 1850 | |
| 1851 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1852 | struct iov_iter *from, int copy) |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1853 | { |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1854 | int err, offset = skb->len; |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1855 | |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1856 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy), |
| 1857 | copy, offset); |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1858 | if (err) |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1859 | __skb_trim(skb, offset); |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1860 | |
| 1861 | return err; |
| 1862 | } |
| 1863 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1864 | static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *from, |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1865 | struct sk_buff *skb, |
| 1866 | struct page *page, |
| 1867 | int off, int copy) |
| 1868 | { |
| 1869 | int err; |
| 1870 | |
Wei Yongjun | 912d398 | 2011-04-06 18:40:12 +0000 | [diff] [blame] | 1871 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off, |
| 1872 | copy, skb->len); |
Tom Herbert | c6e1a0d | 2011-04-04 22:30:30 -0700 | [diff] [blame] | 1873 | if (err) |
| 1874 | return err; |
| 1875 | |
| 1876 | skb->len += copy; |
| 1877 | skb->data_len += copy; |
| 1878 | skb->truesize += copy; |
| 1879 | sk->sk_wmem_queued += copy; |
| 1880 | sk_mem_charge(sk, copy); |
| 1881 | return 0; |
| 1882 | } |
| 1883 | |
Eric Dumazet | c564039 | 2009-06-16 10:12:03 +0000 | [diff] [blame] | 1884 | /** |
| 1885 | * sk_wmem_alloc_get - returns write allocations |
| 1886 | * @sk: socket |
| 1887 | * |
| 1888 | * Returns sk_wmem_alloc minus initial offset of one |
| 1889 | */ |
| 1890 | static inline int sk_wmem_alloc_get(const struct sock *sk) |
| 1891 | { |
| 1892 | return atomic_read(&sk->sk_wmem_alloc) - 1; |
| 1893 | } |
| 1894 | |
| 1895 | /** |
| 1896 | * sk_rmem_alloc_get - returns read allocations |
| 1897 | * @sk: socket |
| 1898 | * |
| 1899 | * Returns sk_rmem_alloc |
| 1900 | */ |
| 1901 | static inline int sk_rmem_alloc_get(const struct sock *sk) |
| 1902 | { |
| 1903 | return atomic_read(&sk->sk_rmem_alloc); |
| 1904 | } |
| 1905 | |
| 1906 | /** |
| 1907 | * sk_has_allocations - check if allocations are outstanding |
| 1908 | * @sk: socket |
| 1909 | * |
| 1910 | * Returns true if socket has write or read allocations |
| 1911 | */ |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1912 | static inline bool sk_has_allocations(const struct sock *sk) |
Eric Dumazet | c564039 | 2009-06-16 10:12:03 +0000 | [diff] [blame] | 1913 | { |
| 1914 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); |
| 1915 | } |
| 1916 | |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1917 | /** |
Herbert Xu | 1ce0bf5 | 2015-11-26 13:55:39 +0800 | [diff] [blame] | 1918 | * skwq_has_sleeper - check if there are any waiting processes |
Randy Dunlap | acfbe96 | 2010-05-24 23:54:18 -0700 | [diff] [blame] | 1919 | * @wq: struct socket_wq |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1920 | * |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1921 | * Returns true if socket_wq has waiting processes |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1922 | * |
Herbert Xu | 1ce0bf5 | 2015-11-26 13:55:39 +0800 | [diff] [blame] | 1923 | * The purpose of the skwq_has_sleeper and sock_poll_wait is to wrap the memory |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1924 | * barrier call. They were added due to the race found within the tcp code. |
| 1925 | * |
| 1926 | * Consider following tcp code paths: |
| 1927 | * |
| 1928 | * CPU1 CPU2 |
| 1929 | * |
| 1930 | * sys_select receive packet |
| 1931 | * ... ... |
| 1932 | * __add_wait_queue update tp->rcv_nxt |
| 1933 | * ... ... |
| 1934 | * tp->rcv_nxt check sock_def_readable |
| 1935 | * ... { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1936 | * schedule rcu_read_lock(); |
| 1937 | * wq = rcu_dereference(sk->sk_wq); |
| 1938 | * if (wq && waitqueue_active(&wq->wait)) |
| 1939 | * wake_up_interruptible(&wq->wait) |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1940 | * ... |
| 1941 | * } |
| 1942 | * |
| 1943 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay |
| 1944 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 |
| 1945 | * could then endup calling schedule and sleep forever if there are no more |
| 1946 | * data on the socket. |
Jiri Olsa | ad46276 | 2009-07-08 12:10:31 +0000 | [diff] [blame] | 1947 | * |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1948 | */ |
Herbert Xu | 1ce0bf5 | 2015-11-26 13:55:39 +0800 | [diff] [blame] | 1949 | static inline bool skwq_has_sleeper(struct socket_wq *wq) |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1950 | { |
Herbert Xu | 1ce0bf5 | 2015-11-26 13:55:39 +0800 | [diff] [blame] | 1951 | return wq && wq_has_sleeper(&wq->wait); |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1952 | } |
| 1953 | |
| 1954 | /** |
| 1955 | * sock_poll_wait - place memory barrier behind the poll_wait call. |
| 1956 | * @filp: file |
| 1957 | * @wait_address: socket wait queue |
| 1958 | * @p: poll_table |
| 1959 | * |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1960 | * See the comments in the wq_has_sleeper function. |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1961 | */ |
| 1962 | static inline void sock_poll_wait(struct file *filp, |
| 1963 | wait_queue_head_t *wait_address, poll_table *p) |
| 1964 | { |
Hans Verkuil | 626cf23 | 2012-03-23 15:02:27 -0700 | [diff] [blame] | 1965 | if (!poll_does_not_wait(p) && wait_address) { |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1966 | poll_wait(filp, wait_address, p); |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1967 | /* We need to be sure we are in sync with the |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1968 | * socket flags modification. |
| 1969 | * |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1970 | * This memory barrier is paired in the wq_has_sleeper. |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1971 | */ |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 1972 | smp_mb(); |
| 1973 | } |
| 1974 | } |
| 1975 | |
Tom Herbert | b73c3d0 | 2014-07-01 21:32:17 -0700 | [diff] [blame] | 1976 | static inline void skb_set_hash_from_sk(struct sk_buff *skb, struct sock *sk) |
| 1977 | { |
| 1978 | if (sk->sk_txhash) { |
| 1979 | skb->l4_hash = 1; |
| 1980 | skb->hash = sk->sk_txhash; |
| 1981 | } |
| 1982 | } |
| 1983 | |
Eric Dumazet | 9e17f8a | 2015-11-01 15:36:55 -0800 | [diff] [blame] | 1984 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk); |
| 1985 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | /* |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1987 | * Queue a received datagram if it will fit. Stream and sequenced |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1988 | * protocols can't normally use this as they need to fit buffers in |
| 1989 | * and play with them. |
| 1990 | * |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 1991 | * Inlined as it's very short and called for pretty much every |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1992 | * packet ever received. |
| 1993 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
| 1995 | { |
Herbert Xu | d55d87f | 2009-06-22 02:25:25 +0000 | [diff] [blame] | 1996 | skb_orphan(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | skb->sk = sk; |
| 1998 | skb->destructor = sock_rfree; |
| 1999 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2000 | sk_mem_charge(sk, skb->truesize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | } |
| 2002 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 2003 | void sk_reset_timer(struct sock *sk, struct timer_list *timer, |
| 2004 | unsigned long expires); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 2006 | void sk_stop_timer(struct sock *sk, struct timer_list *timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | |
Paolo Abeni | f8c3bf0 | 2016-10-21 13:55:45 +0200 | [diff] [blame] | 2008 | int __sk_queue_drop_skb(struct sock *sk, struct sk_buff *skb, |
| 2009 | unsigned int flags); |
samanthakumar | e6afc8a | 2016-04-05 12:41:15 -0400 | [diff] [blame] | 2010 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 2011 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 2013 | int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
Willem de Bruijn | 364a9e9 | 2014-08-31 21:30:27 -0400 | [diff] [blame] | 2014 | struct sk_buff *sock_dequeue_err_skb(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | |
| 2016 | /* |
| 2017 | * Recover an error report and clear atomically |
| 2018 | */ |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 2019 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | static inline int sock_error(struct sock *sk) |
| 2021 | { |
Benjamin LaHaise | c1cbe4b | 2005-12-13 23:22:19 -0800 | [diff] [blame] | 2022 | int err; |
| 2023 | if (likely(!sk->sk_err)) |
| 2024 | return 0; |
| 2025 | err = xchg(&sk->sk_err, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | return -err; |
| 2027 | } |
| 2028 | |
| 2029 | static inline unsigned long sock_wspace(struct sock *sk) |
| 2030 | { |
| 2031 | int amt = 0; |
| 2032 | |
| 2033 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| 2034 | amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 2035 | if (amt < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | amt = 0; |
| 2037 | } |
| 2038 | return amt; |
| 2039 | } |
| 2040 | |
Eric Dumazet | ceb5d58 | 2015-11-29 20:03:11 -0800 | [diff] [blame] | 2041 | /* Note: |
| 2042 | * We use sk->sk_wq_raw, from contexts knowing this |
| 2043 | * pointer is not NULL and cannot disappear/change. |
| 2044 | */ |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 2045 | static inline void sk_set_bit(int nr, struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | { |
Eric Dumazet | 4be7352 | 2016-04-25 10:39:34 -0700 | [diff] [blame] | 2047 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && |
| 2048 | !sock_flag(sk, SOCK_FASYNC)) |
Eric Dumazet | 9317bb6 | 2016-04-25 10:39:32 -0700 | [diff] [blame] | 2049 | return; |
| 2050 | |
Eric Dumazet | ceb5d58 | 2015-11-29 20:03:11 -0800 | [diff] [blame] | 2051 | set_bit(nr, &sk->sk_wq_raw->flags); |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 2052 | } |
| 2053 | |
| 2054 | static inline void sk_clear_bit(int nr, struct sock *sk) |
| 2055 | { |
Eric Dumazet | 4be7352 | 2016-04-25 10:39:34 -0700 | [diff] [blame] | 2056 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) && |
| 2057 | !sock_flag(sk, SOCK_FASYNC)) |
Eric Dumazet | 9317bb6 | 2016-04-25 10:39:32 -0700 | [diff] [blame] | 2058 | return; |
| 2059 | |
Eric Dumazet | ceb5d58 | 2015-11-29 20:03:11 -0800 | [diff] [blame] | 2060 | clear_bit(nr, &sk->sk_wq_raw->flags); |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 2061 | } |
| 2062 | |
Eric Dumazet | ceb5d58 | 2015-11-29 20:03:11 -0800 | [diff] [blame] | 2063 | static inline void sk_wake_async(const struct sock *sk, int how, int band) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | { |
Eric Dumazet | ceb5d58 | 2015-11-29 20:03:11 -0800 | [diff] [blame] | 2065 | if (sock_flag(sk, SOCK_FASYNC)) { |
| 2066 | rcu_read_lock(); |
| 2067 | sock_wake_async(rcu_dereference(sk->sk_wq), how, band); |
| 2068 | rcu_read_unlock(); |
| 2069 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | } |
| 2071 | |
Daniel Borkmann | eea86af | 2013-06-19 12:51:20 +0200 | [diff] [blame] | 2072 | /* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might |
| 2073 | * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak. |
| 2074 | * Note: for send buffers, TCP works better if we can build two skbs at |
| 2075 | * minimum. |
Eric Dumazet | 7a91b434 | 2010-09-26 18:53:07 -0700 | [diff] [blame] | 2076 | */ |
Eric Dumazet | 9eb5bf8 | 2013-07-03 05:02:22 -0700 | [diff] [blame] | 2077 | #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff))) |
Daniel Borkmann | eea86af | 2013-06-19 12:51:20 +0200 | [diff] [blame] | 2078 | |
| 2079 | #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2) |
| 2080 | #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | |
| 2082 | static inline void sk_stream_moderate_sndbuf(struct sock *sk) |
| 2083 | { |
| 2084 | if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { |
Eric Dumazet | 8df09ea | 2007-12-21 03:07:41 -0800 | [diff] [blame] | 2085 | sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); |
Daniel Borkmann | eea86af | 2013-06-19 12:51:20 +0200 | [diff] [blame] | 2086 | sk->sk_sndbuf = max_t(u32, sk->sk_sndbuf, SOCK_MIN_SNDBUF); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | } |
| 2088 | } |
| 2089 | |
Eric Dumazet | eb93447 | 2015-05-19 13:26:55 -0700 | [diff] [blame] | 2090 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp, |
| 2091 | bool force_schedule); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2093 | /** |
| 2094 | * sk_page_frag - return an appropriate page_frag |
| 2095 | * @sk: socket |
| 2096 | * |
| 2097 | * If socket allocation mode allows current thread to sleep, it means its |
| 2098 | * safe to use the per task page_frag instead of the per socket one. |
| 2099 | */ |
| 2100 | static inline struct page_frag *sk_page_frag(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | { |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 2102 | if (gfpflags_allow_blocking(sk->sk_allocation)) |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2103 | return ¤t->task_frag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2105 | return &sk->sk_frag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | } |
| 2107 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 2108 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag); |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | /* |
| 2111 | * Default write policy as shown to user space via poll/select/SIGIO |
| 2112 | */ |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 2113 | static inline bool sock_writeable(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | { |
Eric Dumazet | 8df09ea | 2007-12-21 03:07:41 -0800 | [diff] [blame] | 2115 | return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | } |
| 2117 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 2118 | static inline gfp_t gfp_any(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | { |
Andrew Morton | 9970937 | 2009-02-12 16:43:17 -0800 | [diff] [blame] | 2120 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | } |
| 2122 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 2123 | static inline long sock_rcvtimeo(const struct sock *sk, bool noblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | { |
| 2125 | return noblock ? 0 : sk->sk_rcvtimeo; |
| 2126 | } |
| 2127 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 2128 | static inline long sock_sndtimeo(const struct sock *sk, bool noblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2129 | { |
| 2130 | return noblock ? 0 : sk->sk_sndtimeo; |
| 2131 | } |
| 2132 | |
| 2133 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) |
| 2134 | { |
| 2135 | return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; |
| 2136 | } |
| 2137 | |
| 2138 | /* Alas, with timeout socket operations are not restartable. |
| 2139 | * Compare this to poll(). |
| 2140 | */ |
| 2141 | static inline int sock_intr_errno(long timeo) |
| 2142 | { |
| 2143 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; |
| 2144 | } |
| 2145 | |
Eyal Birger | 744d5a3 | 2015-03-01 14:58:31 +0200 | [diff] [blame] | 2146 | struct sock_skb_cb { |
| 2147 | u32 dropcount; |
| 2148 | }; |
| 2149 | |
| 2150 | /* Store sock_skb_cb at the end of skb->cb[] so protocol families |
| 2151 | * using skb->cb[] would keep using it directly and utilize its |
| 2152 | * alignement guarantee. |
| 2153 | */ |
| 2154 | #define SOCK_SKB_CB_OFFSET ((FIELD_SIZEOF(struct sk_buff, cb) - \ |
| 2155 | sizeof(struct sock_skb_cb))) |
| 2156 | |
| 2157 | #define SOCK_SKB_CB(__skb) ((struct sock_skb_cb *)((__skb)->cb + \ |
| 2158 | SOCK_SKB_CB_OFFSET)) |
| 2159 | |
Eyal Birger | b4772ef | 2015-03-01 14:58:29 +0200 | [diff] [blame] | 2160 | #define sock_skb_cb_check_size(size) \ |
Eyal Birger | 744d5a3 | 2015-03-01 14:58:31 +0200 | [diff] [blame] | 2161 | BUILD_BUG_ON((size) > SOCK_SKB_CB_OFFSET) |
Eyal Birger | b4772ef | 2015-03-01 14:58:29 +0200 | [diff] [blame] | 2162 | |
Eyal Birger | 3bc3b96 | 2015-03-01 14:58:30 +0200 | [diff] [blame] | 2163 | static inline void |
| 2164 | sock_skb_set_dropcount(const struct sock *sk, struct sk_buff *skb) |
| 2165 | { |
Eric Dumazet | 3665f38 | 2016-12-07 10:05:36 -0800 | [diff] [blame] | 2166 | SOCK_SKB_CB(skb)->dropcount = sock_flag(sk, SOCK_RXQ_OVFL) ? |
| 2167 | atomic_read(&sk->sk_drops) : 0; |
Eyal Birger | 3bc3b96 | 2015-03-01 14:58:30 +0200 | [diff] [blame] | 2168 | } |
| 2169 | |
Eric Dumazet | 532182c | 2016-04-01 08:52:19 -0700 | [diff] [blame] | 2170 | static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb) |
| 2171 | { |
| 2172 | int segs = max_t(u16, 1, skb_shinfo(skb)->gso_segs); |
| 2173 | |
| 2174 | atomic_add(segs, &sk->sk_drops); |
| 2175 | } |
| 2176 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 2177 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
| 2178 | struct sk_buff *skb); |
| 2179 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
| 2180 | struct sk_buff *skb); |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 2181 | |
Eric Dumazet | dc6b9b7 | 2012-05-16 22:48:15 +0000 | [diff] [blame] | 2182 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) |
| 2184 | { |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2185 | ktime_t kt = skb->tstamp; |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2186 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 2187 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2188 | /* |
| 2189 | * generate control messages if |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 2190 | * - receive time stamping in software requested |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2191 | * - software time stamp available and wanted |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2192 | * - hardware time stamps available and wanted |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2193 | */ |
| 2194 | if (sock_flag(sk, SOCK_RCVTSTAMP) || |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 2195 | (sk->sk_tsflags & SOF_TIMESTAMPING_RX_SOFTWARE) || |
Thomas Gleixner | 2456e85 | 2016-12-25 11:38:40 +0100 | [diff] [blame] | 2196 | (kt && sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) || |
| 2197 | (hwtstamps->hwtstamp && |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 2198 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE))) |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 2199 | __sock_recv_timestamp(msg, sk, skb); |
| 2200 | else |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2201 | sk->sk_stamp = kt; |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 2202 | |
| 2203 | if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid) |
| 2204 | __sock_recv_wifi_status(msg, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | } |
| 2206 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 2207 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
| 2208 | struct sk_buff *skb); |
Eric Dumazet | 767dd03 | 2010-04-28 19:14:43 +0000 | [diff] [blame] | 2209 | |
| 2210 | static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
| 2211 | struct sk_buff *skb) |
| 2212 | { |
| 2213 | #define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \ |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 2214 | (1UL << SOCK_RCVTSTAMP)) |
| 2215 | #define TSFLAGS_ANY (SOF_TIMESTAMPING_SOFTWARE | \ |
| 2216 | SOF_TIMESTAMPING_RAW_HARDWARE) |
Eric Dumazet | 767dd03 | 2010-04-28 19:14:43 +0000 | [diff] [blame] | 2217 | |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 2218 | if (sk->sk_flags & FLAGS_TS_OR_DROPS || sk->sk_tsflags & TSFLAGS_ANY) |
Eric Dumazet | 767dd03 | 2010-04-28 19:14:43 +0000 | [diff] [blame] | 2219 | __sock_recv_ts_and_drops(msg, sk, skb); |
| 2220 | else |
| 2221 | sk->sk_stamp = skb->tstamp; |
| 2222 | } |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 2223 | |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 2224 | void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags); |
Willem de Bruijn | 67cc0d4 | 2014-09-08 19:58:58 -0400 | [diff] [blame] | 2225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | /** |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2227 | * 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] | 2228 | * @sk: socket sending this packet |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 2229 | * @tsflags: timestamping flags to use |
Eric Dumazet | 140c55d | 2014-08-06 11:49:29 +0200 | [diff] [blame] | 2230 | * @tx_flags: completed with instructions for time stamping |
| 2231 | * |
| 2232 | * Note : callers should take care of initial *tx_flags value (usually 0) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2233 | */ |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 2234 | static inline void sock_tx_timestamp(const struct sock *sk, __u16 tsflags, |
| 2235 | __u8 *tx_flags) |
Willem de Bruijn | 67cc0d4 | 2014-09-08 19:58:58 -0400 | [diff] [blame] | 2236 | { |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 2237 | if (unlikely(tsflags)) |
| 2238 | __sock_tx_timestamp(tsflags, tx_flags); |
Willem de Bruijn | 67cc0d4 | 2014-09-08 19:58:58 -0400 | [diff] [blame] | 2239 | if (unlikely(sock_flag(sk, SOCK_WIFI_STATUS))) |
| 2240 | *tx_flags |= SKBTX_WIFI_STATUS; |
| 2241 | } |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2242 | |
| 2243 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | * sk_eat_skb - Release a skb if it is no longer needed |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 2245 | * @sk: socket to eat this skb from |
| 2246 | * @skb: socket buffer to eat |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | * |
| 2248 | * This routine must be called with interrupts disabled or with the socket |
| 2249 | * locked so that the sk_buff queue operation is ok. |
| 2250 | */ |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 2251 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2252 | { |
| 2253 | __skb_unlink(skb, &sk->sk_receive_queue); |
| 2254 | __kfree_skb(skb); |
| 2255 | } |
| 2256 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2257 | static inline |
| 2258 | struct net *sock_net(const struct sock *sk) |
| 2259 | { |
Eric Dumazet | c2d9ba9 | 2010-06-01 06:51:19 +0000 | [diff] [blame] | 2260 | return read_pnet(&sk->sk_net); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2261 | } |
| 2262 | |
| 2263 | static inline |
Denis V. Lunev | f5aa23f | 2008-03-26 00:48:17 -0700 | [diff] [blame] | 2264 | void sock_net_set(struct sock *sk, struct net *net) |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2265 | { |
Eric Dumazet | c2d9ba9 | 2010-06-01 06:51:19 +0000 | [diff] [blame] | 2266 | write_pnet(&sk->sk_net, net); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2267 | } |
| 2268 | |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 2269 | static inline struct sock *skb_steal_sock(struct sk_buff *skb) |
| 2270 | { |
Vijay Subramanian | efc27f8 | 2012-06-24 13:03:07 +0000 | [diff] [blame] | 2271 | if (skb->sk) { |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 2272 | struct sock *sk = skb->sk; |
| 2273 | |
| 2274 | skb->destructor = NULL; |
| 2275 | skb->sk = NULL; |
| 2276 | return sk; |
| 2277 | } |
| 2278 | return NULL; |
| 2279 | } |
| 2280 | |
Eric Dumazet | 1d0ab25 | 2015-03-15 21:12:12 -0700 | [diff] [blame] | 2281 | /* This helper checks if a socket is a full socket, |
| 2282 | * ie _not_ a timewait or request socket. |
| 2283 | */ |
| 2284 | static inline bool sk_fullsock(const struct sock *sk) |
| 2285 | { |
| 2286 | return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV); |
| 2287 | } |
| 2288 | |
Eric Dumazet | e446f9d | 2015-10-08 05:01:55 -0700 | [diff] [blame] | 2289 | /* This helper checks if a socket is a LISTEN or NEW_SYN_RECV |
| 2290 | * SYNACK messages can be attached to either ones (depending on SYNCOOKIE) |
| 2291 | */ |
| 2292 | static inline bool sk_listener(const struct sock *sk) |
| 2293 | { |
| 2294 | return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV); |
| 2295 | } |
| 2296 | |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2297 | /** |
| 2298 | * sk_state_load - read sk->sk_state for lockless contexts |
| 2299 | * @sk: socket pointer |
| 2300 | * |
| 2301 | * Paired with sk_state_store(). Used in places we do not hold socket lock : |
| 2302 | * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ... |
| 2303 | */ |
| 2304 | static inline int sk_state_load(const struct sock *sk) |
| 2305 | { |
| 2306 | return smp_load_acquire(&sk->sk_state); |
| 2307 | } |
| 2308 | |
| 2309 | /** |
| 2310 | * sk_state_store - update sk->sk_state |
| 2311 | * @sk: socket pointer |
| 2312 | * @newstate: new state |
| 2313 | * |
| 2314 | * Paired with sk_state_load(). Should be used in contexts where |
| 2315 | * state change might impact lockless readers. |
| 2316 | */ |
| 2317 | static inline void sk_state_store(struct sock *sk, int newstate) |
| 2318 | { |
| 2319 | smp_store_release(&sk->sk_state, newstate); |
| 2320 | } |
| 2321 | |
Joe Perches | 69336bd | 2013-09-22 10:32:26 -0700 | [diff] [blame] | 2322 | void sock_enable_timestamp(struct sock *sk, int flag); |
| 2323 | int sock_get_timestamp(struct sock *, struct timeval __user *); |
| 2324 | int sock_get_timestampns(struct sock *, struct timespec __user *); |
| 2325 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, int level, |
| 2326 | int type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | |
Eric W. Biederman | a3b299d | 2014-04-23 14:26:56 -0700 | [diff] [blame] | 2328 | bool sk_ns_capable(const struct sock *sk, |
| 2329 | struct user_namespace *user_ns, int cap); |
| 2330 | bool sk_capable(const struct sock *sk, int cap); |
| 2331 | bool sk_net_capable(const struct sock *sk, int cap); |
| 2332 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | extern __u32 sysctl_wmem_max; |
| 2334 | extern __u32 sysctl_rmem_max; |
| 2335 | |
Willem de Bruijn | b245be1 | 2015-01-30 13:29:32 -0500 | [diff] [blame] | 2336 | extern int sysctl_tstamp_allow_data; |
David S. Miller | 6baf1f4 | 2005-09-05 18:14:11 -0700 | [diff] [blame] | 2337 | extern int sysctl_optmem_max; |
| 2338 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 2339 | extern __u32 sysctl_wmem_default; |
| 2340 | extern __u32 sysctl_rmem_default; |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 2341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | #endif /* _SOCK_H */ |