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 | * Generic socket support routines. Memory allocators, socket lock/release |
| 7 | * handler for protocols to use and generic option handler. |
| 8 | * |
| 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 | * Florian La Roche, <flla@stud.uni-sb.de> |
| 13 | * Alan Cox, <A.Cox@swansea.ac.uk> |
| 14 | * |
| 15 | * Fixes: |
| 16 | * Alan Cox : Numerous verify_area() problems |
| 17 | * Alan Cox : Connecting on a connecting socket |
| 18 | * now returns an error for tcp. |
| 19 | * Alan Cox : sock->protocol is set correctly. |
| 20 | * and is not sometimes left as 0. |
| 21 | * Alan Cox : connect handles icmp errors on a |
| 22 | * connect properly. Unfortunately there |
| 23 | * is a restart syscall nasty there. I |
| 24 | * can't match BSD without hacking the C |
| 25 | * library. Ideas urgently sought! |
| 26 | * Alan Cox : Disallow bind() to addresses that are |
| 27 | * not ours - especially broadcast ones!! |
| 28 | * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) |
| 29 | * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, |
| 30 | * instead they leave that for the DESTROY timer. |
| 31 | * Alan Cox : Clean up error flag in accept |
| 32 | * Alan Cox : TCP ack handling is buggy, the DESTROY timer |
| 33 | * was buggy. Put a remove_sock() in the handler |
| 34 | * for memory when we hit 0. Also altered the timer |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 35 | * code. The ACK stuff can wait and needs major |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | * TCP layer surgery. |
| 37 | * Alan Cox : Fixed TCP ack bug, removed remove sock |
| 38 | * and fixed timer/inet_bh race. |
| 39 | * Alan Cox : Added zapped flag for TCP |
| 40 | * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code |
| 41 | * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb |
| 42 | * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources |
| 43 | * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. |
| 44 | * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... |
| 45 | * Rick Sladkey : Relaxed UDP rules for matching packets. |
| 46 | * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support |
| 47 | * Pauline Middelink : identd support |
| 48 | * Alan Cox : Fixed connect() taking signals I think. |
| 49 | * Alan Cox : SO_LINGER supported |
| 50 | * Alan Cox : Error reporting fixes |
| 51 | * Anonymous : inet_create tidied up (sk->reuse setting) |
| 52 | * Alan Cox : inet sockets don't set sk->type! |
| 53 | * Alan Cox : Split socket option code |
| 54 | * Alan Cox : Callbacks |
| 55 | * Alan Cox : Nagle flag for Charles & Johannes stuff |
| 56 | * Alex : Removed restriction on inet fioctl |
| 57 | * Alan Cox : Splitting INET from NET core |
| 58 | * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() |
| 59 | * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code |
| 60 | * Alan Cox : Split IP from generic code |
| 61 | * Alan Cox : New kfree_skbmem() |
| 62 | * Alan Cox : Make SO_DEBUG superuser only. |
| 63 | * Alan Cox : Allow anyone to clear SO_DEBUG |
| 64 | * (compatibility fix) |
| 65 | * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. |
| 66 | * Alan Cox : Allocator for a socket is settable. |
| 67 | * Alan Cox : SO_ERROR includes soft errors. |
| 68 | * Alan Cox : Allow NULL arguments on some SO_ opts |
| 69 | * Alan Cox : Generic socket allocation to make hooks |
| 70 | * easier (suggested by Craig Metz). |
| 71 | * Michael Pall : SO_ERROR returns positive errno again |
| 72 | * Steve Whitehouse: Added default destructor to free |
| 73 | * protocol private data. |
| 74 | * Steve Whitehouse: Added various other default routines |
| 75 | * common to several socket families. |
| 76 | * Chris Evans : Call suser() check last on F_SETOWN |
| 77 | * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. |
| 78 | * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() |
| 79 | * Andi Kleen : Fix write_space callback |
| 80 | * Chris Evans : Security fixes - signedness again |
| 81 | * Arnaldo C. Melo : cleanups, use skb_queue_purge |
| 82 | * |
| 83 | * To Fix: |
| 84 | * |
| 85 | * |
| 86 | * This program is free software; you can redistribute it and/or |
| 87 | * modify it under the terms of the GNU General Public License |
| 88 | * as published by the Free Software Foundation; either version |
| 89 | * 2 of the License, or (at your option) any later version. |
| 90 | */ |
| 91 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 92 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | #include <linux/errno.h> |
| 94 | #include <linux/types.h> |
| 95 | #include <linux/socket.h> |
| 96 | #include <linux/in.h> |
| 97 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | #include <linux/module.h> |
| 99 | #include <linux/proc_fs.h> |
| 100 | #include <linux/seq_file.h> |
| 101 | #include <linux/sched.h> |
| 102 | #include <linux/timer.h> |
| 103 | #include <linux/string.h> |
| 104 | #include <linux/sockios.h> |
| 105 | #include <linux/net.h> |
| 106 | #include <linux/mm.h> |
| 107 | #include <linux/slab.h> |
| 108 | #include <linux/interrupt.h> |
| 109 | #include <linux/poll.h> |
| 110 | #include <linux/tcp.h> |
| 111 | #include <linux/init.h> |
Al Viro | a1f8e7f | 2006-10-19 16:08:53 -0400 | [diff] [blame] | 112 | #include <linux/highmem.h> |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 113 | #include <linux/user_namespace.h> |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 114 | #include <linux/static_key.h> |
David S. Miller | 3969eb3 | 2012-01-09 13:44:23 -0800 | [diff] [blame] | 115 | #include <linux/memcontrol.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
| 117 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | #include <linux/netdevice.h> |
| 120 | #include <net/protocol.h> |
| 121 | #include <linux/skbuff.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 122 | #include <net/net_namespace.h> |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 123 | #include <net/request_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | #include <net/sock.h> |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 125 | #include <linux/net_tstamp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | #include <net/xfrm.h> |
| 127 | #include <linux/ipsec.h> |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 128 | #include <net/cls_cgroup.h> |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 129 | #include <net/netprio_cgroup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | #include <linux/filter.h> |
| 132 | |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 133 | #include <trace/events/sock.h> |
| 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | #ifdef CONFIG_INET |
| 136 | #include <net/tcp.h> |
| 137 | #endif |
| 138 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 139 | static DEFINE_MUTEX(proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 140 | static LIST_HEAD(proto_list); |
| 141 | |
| 142 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM |
| 143 | int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss) |
| 144 | { |
| 145 | struct proto *proto; |
| 146 | int ret = 0; |
| 147 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 148 | mutex_lock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 149 | list_for_each_entry(proto, &proto_list, node) { |
| 150 | if (proto->init_cgroup) { |
| 151 | ret = proto->init_cgroup(cgrp, ss); |
| 152 | if (ret) |
| 153 | goto out; |
| 154 | } |
| 155 | } |
| 156 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 157 | mutex_unlock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 158 | return ret; |
| 159 | out: |
| 160 | list_for_each_entry_continue_reverse(proto, &proto_list, node) |
| 161 | if (proto->destroy_cgroup) |
Li Zefan | 761b3ef | 2012-01-31 13:47:36 +0800 | [diff] [blame] | 162 | proto->destroy_cgroup(cgrp); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 163 | mutex_unlock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 164 | return ret; |
| 165 | } |
| 166 | |
Li Zefan | 761b3ef | 2012-01-31 13:47:36 +0800 | [diff] [blame] | 167 | void mem_cgroup_sockets_destroy(struct cgroup *cgrp) |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 168 | { |
| 169 | struct proto *proto; |
| 170 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 171 | mutex_lock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 172 | list_for_each_entry_reverse(proto, &proto_list, node) |
| 173 | if (proto->destroy_cgroup) |
Li Zefan | 761b3ef | 2012-01-31 13:47:36 +0800 | [diff] [blame] | 174 | proto->destroy_cgroup(cgrp); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 175 | mutex_unlock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 176 | } |
| 177 | #endif |
| 178 | |
Ingo Molnar | da21f24 | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 179 | /* |
| 180 | * Each address family might have different locking rules, so we have |
| 181 | * one slock key per address family: |
| 182 | */ |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 183 | static struct lock_class_key af_family_keys[AF_MAX]; |
| 184 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
| 185 | |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 186 | struct static_key memcg_socket_limit_enabled; |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 187 | EXPORT_SYMBOL(memcg_socket_limit_enabled); |
| 188 | |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 189 | /* |
| 190 | * Make lock validator output more readable. (we pre-construct these |
| 191 | * strings build-time, so that runtime initialization of socket |
| 192 | * locks is fast): |
| 193 | */ |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 194 | static const char *const af_family_key_strings[AF_MAX+1] = { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 195 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
| 196 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", |
| 197 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , |
| 198 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , |
| 199 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , |
| 200 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , |
| 201 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 202 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 203 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
Oliver Hartkopp | cd05acf | 2007-12-16 15:59:24 -0800 | [diff] [blame] | 204 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 205 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 206 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 207 | "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
Aloisio Almeida Jr | c7fe3b5 | 2011-07-01 19:31:35 -0300 | [diff] [blame] | 208 | "sk_lock-AF_NFC" , "sk_lock-AF_MAX" |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 209 | }; |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 210 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 211 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
| 212 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", |
| 213 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , |
| 214 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , |
| 215 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , |
| 216 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , |
| 217 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 218 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 219 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
Oliver Hartkopp | cd05acf | 2007-12-16 15:59:24 -0800 | [diff] [blame] | 220 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 221 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 222 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 223 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
Aloisio Almeida Jr | c7fe3b5 | 2011-07-01 19:31:35 -0300 | [diff] [blame] | 224 | "slock-AF_NFC" , "slock-AF_MAX" |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 225 | }; |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 226 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 227 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
| 228 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", |
| 229 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , |
| 230 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , |
| 231 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , |
| 232 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , |
| 233 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 234 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 235 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
Oliver Hartkopp | b4942af | 2008-07-23 14:06:04 -0700 | [diff] [blame] | 236 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
David Howells | e51f802 | 2007-07-21 19:30:16 -0700 | [diff] [blame] | 237 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 238 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 239 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
Aloisio Almeida Jr | c7fe3b5 | 2011-07-01 19:31:35 -0300 | [diff] [blame] | 240 | "clock-AF_NFC" , "clock-AF_MAX" |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 241 | }; |
Ingo Molnar | da21f24 | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 242 | |
| 243 | /* |
| 244 | * sk_callback_lock locking rules are per-address-family, |
| 245 | * so split the lock classes by using a per-AF key: |
| 246 | */ |
| 247 | static struct lock_class_key af_callback_keys[AF_MAX]; |
| 248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | /* Take into consideration the size of the struct sk_buff overhead in the |
| 250 | * determination of these values, since that is non-constant across |
| 251 | * platforms. This makes socket queueing behavior and performance |
| 252 | * not depend upon such differences. |
| 253 | */ |
| 254 | #define _SK_MEM_PACKETS 256 |
Eric Dumazet | 87fb4b7 | 2011-10-13 07:28:54 +0000 | [diff] [blame] | 255 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 257 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 258 | |
| 259 | /* Run time adjustable parameters. */ |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 260 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
| 261 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
| 262 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
| 263 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 265 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 266 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 267 | EXPORT_SYMBOL(sysctl_optmem_max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 269 | #if defined(CONFIG_CGROUPS) |
| 270 | #if !defined(CONFIG_NET_CLS_CGROUP) |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 271 | int net_cls_subsys_id = -1; |
| 272 | EXPORT_SYMBOL_GPL(net_cls_subsys_id); |
| 273 | #endif |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 274 | #if !defined(CONFIG_NETPRIO_CGROUP) |
| 275 | int net_prio_subsys_id = -1; |
| 276 | EXPORT_SYMBOL_GPL(net_prio_subsys_id); |
| 277 | #endif |
| 278 | #endif |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
| 281 | { |
| 282 | struct timeval tv; |
| 283 | |
| 284 | if (optlen < sizeof(tv)) |
| 285 | return -EINVAL; |
| 286 | if (copy_from_user(&tv, optval, sizeof(tv))) |
| 287 | return -EFAULT; |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 288 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
| 289 | return -EDOM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 291 | if (tv.tv_sec < 0) { |
Andrew Morton | 6f11df8 | 2007-07-09 13:16:00 -0700 | [diff] [blame] | 292 | static int warned __read_mostly; |
| 293 | |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 294 | *timeo_p = 0; |
Ilpo Järvinen | 50aab54 | 2008-05-02 16:20:10 -0700 | [diff] [blame] | 295 | if (warned < 10 && net_ratelimit()) { |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 296 | warned++; |
| 297 | printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " |
| 298 | "tries to set negative timeout\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 299 | current->comm, task_pid_nr(current)); |
Ilpo Järvinen | 50aab54 | 2008-05-02 16:20:10 -0700 | [diff] [blame] | 300 | } |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 301 | return 0; |
| 302 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
| 304 | if (tv.tv_sec == 0 && tv.tv_usec == 0) |
| 305 | return 0; |
| 306 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) |
| 307 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); |
| 308 | return 0; |
| 309 | } |
| 310 | |
| 311 | static void sock_warn_obsolete_bsdism(const char *name) |
| 312 | { |
| 313 | static int warned; |
| 314 | static char warncomm[TASK_COMM_LEN]; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 315 | if (strcmp(warncomm, current->comm) && warned < 5) { |
| 316 | strcpy(warncomm, current->comm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | printk(KERN_WARNING "process `%s' is using obsolete " |
| 318 | "%s SO_BSDCOMPAT\n", warncomm, name); |
| 319 | warned++; |
| 320 | } |
| 321 | } |
| 322 | |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 323 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
| 324 | |
| 325 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 326 | { |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 327 | if (sk->sk_flags & flags) { |
| 328 | sk->sk_flags &= ~flags; |
| 329 | if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 330 | net_disable_timestamp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | } |
| 332 | } |
| 333 | |
| 334 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 335 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 336 | { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 337 | int err; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 338 | int skb_len; |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 339 | unsigned long flags; |
| 340 | struct sk_buff_head *list = &sk->sk_receive_queue; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 341 | |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 342 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 343 | atomic_inc(&sk->sk_drops); |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 344 | trace_sock_rcvqueue_full(sk, skb); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 345 | return -ENOMEM; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 346 | } |
| 347 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 348 | err = sk_filter(sk, skb); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 349 | if (err) |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 350 | return err; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 351 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 352 | if (!sk_rmem_schedule(sk, skb->truesize)) { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 353 | atomic_inc(&sk->sk_drops); |
| 354 | return -ENOBUFS; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 355 | } |
| 356 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 357 | skb->dev = NULL; |
| 358 | skb_set_owner_r(skb, sk); |
David S. Miller | 49ad959 | 2008-12-17 22:11:38 -0800 | [diff] [blame] | 359 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 360 | /* Cache the SKB length before we tack it onto the receive |
| 361 | * queue. Once it is added it no longer belongs to us and |
| 362 | * may be freed by other threads of control pulling packets |
| 363 | * from the queue. |
| 364 | */ |
| 365 | skb_len = skb->len; |
| 366 | |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 367 | /* we escape from rcu protected region, make sure we dont leak |
| 368 | * a norefcounted dst |
| 369 | */ |
| 370 | skb_dst_force(skb); |
| 371 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 372 | spin_lock_irqsave(&list->lock, flags); |
| 373 | skb->dropcount = atomic_read(&sk->sk_drops); |
| 374 | __skb_queue_tail(list, skb); |
| 375 | spin_unlock_irqrestore(&list->lock, flags); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 376 | |
| 377 | if (!sock_flag(sk, SOCK_DEAD)) |
| 378 | sk->sk_data_ready(sk, skb_len); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 379 | return 0; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 380 | } |
| 381 | EXPORT_SYMBOL(sock_queue_rcv_skb); |
| 382 | |
Arnaldo Carvalho de Melo | 58a5a7b | 2006-11-16 14:06:06 -0200 | [diff] [blame] | 383 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 384 | { |
| 385 | int rc = NET_RX_SUCCESS; |
| 386 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 387 | if (sk_filter(sk, skb)) |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 388 | goto discard_and_relse; |
| 389 | |
| 390 | skb->dev = NULL; |
| 391 | |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 392 | if (sk_rcvqueues_full(sk, skb)) { |
| 393 | atomic_inc(&sk->sk_drops); |
| 394 | goto discard_and_relse; |
| 395 | } |
Arnaldo Carvalho de Melo | 58a5a7b | 2006-11-16 14:06:06 -0200 | [diff] [blame] | 396 | if (nested) |
| 397 | bh_lock_sock_nested(sk); |
| 398 | else |
| 399 | bh_lock_sock(sk); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 400 | if (!sock_owned_by_user(sk)) { |
| 401 | /* |
| 402 | * trylock + unlock semantics: |
| 403 | */ |
| 404 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); |
| 405 | |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 406 | rc = sk_backlog_rcv(sk, skb); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 407 | |
| 408 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
Zhu Yi | a3a858f | 2010-03-04 18:01:47 +0000 | [diff] [blame] | 409 | } else if (sk_add_backlog(sk, skb)) { |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 410 | bh_unlock_sock(sk); |
| 411 | atomic_inc(&sk->sk_drops); |
| 412 | goto discard_and_relse; |
| 413 | } |
| 414 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 415 | bh_unlock_sock(sk); |
| 416 | out: |
| 417 | sock_put(sk); |
| 418 | return rc; |
| 419 | discard_and_relse: |
| 420 | kfree_skb(skb); |
| 421 | goto out; |
| 422 | } |
| 423 | EXPORT_SYMBOL(sk_receive_skb); |
| 424 | |
Krishna Kumar | ea94ff3 | 2009-10-19 23:46:45 +0000 | [diff] [blame] | 425 | void sk_reset_txq(struct sock *sk) |
| 426 | { |
| 427 | sk_tx_queue_clear(sk); |
| 428 | } |
| 429 | EXPORT_SYMBOL(sk_reset_txq); |
| 430 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 431 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
| 432 | { |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 433 | struct dst_entry *dst = __sk_dst_get(sk); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 434 | |
| 435 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 436 | sk_tx_queue_clear(sk); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 437 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 438 | dst_release(dst); |
| 439 | return NULL; |
| 440 | } |
| 441 | |
| 442 | return dst; |
| 443 | } |
| 444 | EXPORT_SYMBOL(__sk_dst_check); |
| 445 | |
| 446 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) |
| 447 | { |
| 448 | struct dst_entry *dst = sk_dst_get(sk); |
| 449 | |
| 450 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
| 451 | sk_dst_reset(sk); |
| 452 | dst_release(dst); |
| 453 | return NULL; |
| 454 | } |
| 455 | |
| 456 | return dst; |
| 457 | } |
| 458 | EXPORT_SYMBOL(sk_dst_check); |
| 459 | |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 460 | static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) |
| 461 | { |
| 462 | int ret = -ENOPROTOOPT; |
| 463 | #ifdef CONFIG_NETDEVICES |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 464 | struct net *net = sock_net(sk); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 465 | char devname[IFNAMSIZ]; |
| 466 | int index; |
| 467 | |
| 468 | /* Sorry... */ |
| 469 | ret = -EPERM; |
| 470 | if (!capable(CAP_NET_RAW)) |
| 471 | goto out; |
| 472 | |
| 473 | ret = -EINVAL; |
| 474 | if (optlen < 0) |
| 475 | goto out; |
| 476 | |
| 477 | /* Bind this socket to a particular device like "eth0", |
| 478 | * as specified in the passed interface name. If the |
| 479 | * name is "" or the option length is zero the socket |
| 480 | * is not bound. |
| 481 | */ |
| 482 | if (optlen > IFNAMSIZ - 1) |
| 483 | optlen = IFNAMSIZ - 1; |
| 484 | memset(devname, 0, sizeof(devname)); |
| 485 | |
| 486 | ret = -EFAULT; |
| 487 | if (copy_from_user(devname, optval, optlen)) |
| 488 | goto out; |
| 489 | |
David S. Miller | 000ba2e | 2009-11-05 22:37:11 -0800 | [diff] [blame] | 490 | index = 0; |
| 491 | if (devname[0] != '\0') { |
Eric Dumazet | bf8e56b | 2009-11-05 21:03:39 -0800 | [diff] [blame] | 492 | struct net_device *dev; |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 493 | |
Eric Dumazet | bf8e56b | 2009-11-05 21:03:39 -0800 | [diff] [blame] | 494 | rcu_read_lock(); |
| 495 | dev = dev_get_by_name_rcu(net, devname); |
| 496 | if (dev) |
| 497 | index = dev->ifindex; |
| 498 | rcu_read_unlock(); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 499 | ret = -ENODEV; |
| 500 | if (!dev) |
| 501 | goto out; |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 502 | } |
| 503 | |
| 504 | lock_sock(sk); |
| 505 | sk->sk_bound_dev_if = index; |
| 506 | sk_dst_reset(sk); |
| 507 | release_sock(sk); |
| 508 | |
| 509 | ret = 0; |
| 510 | |
| 511 | out: |
| 512 | #endif |
| 513 | |
| 514 | return ret; |
| 515 | } |
| 516 | |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 517 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
| 518 | { |
| 519 | if (valbool) |
| 520 | sock_set_flag(sk, bit); |
| 521 | else |
| 522 | sock_reset_flag(sk, bit); |
| 523 | } |
| 524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | /* |
| 526 | * This is meant for all protocols to use and covers goings on |
| 527 | * at the socket level. Everything here is generic. |
| 528 | */ |
| 529 | |
| 530 | int sock_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 531 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | { |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 533 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | int val; |
| 535 | int valbool; |
| 536 | struct linger ling; |
| 537 | int ret = 0; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 538 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | /* |
| 540 | * Options without arguments |
| 541 | */ |
| 542 | |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 543 | if (optname == SO_BINDTODEVICE) |
| 544 | return sock_bindtodevice(sk, optval, optlen); |
| 545 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 546 | if (optlen < sizeof(int)) |
| 547 | return -EINVAL; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | if (get_user(val, (int __user *)optval)) |
| 550 | return -EFAULT; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 551 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 552 | valbool = val ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
| 554 | lock_sock(sk); |
| 555 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 556 | switch (optname) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 557 | case SO_DEBUG: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 558 | if (val && !capable(CAP_NET_ADMIN)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 559 | ret = -EACCES; |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 560 | else |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 561 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 562 | break; |
| 563 | case SO_REUSEADDR: |
| 564 | sk->sk_reuse = valbool; |
| 565 | break; |
| 566 | case SO_TYPE: |
Jan Engelhardt | 49c794e | 2009-08-04 07:28:28 +0000 | [diff] [blame] | 567 | case SO_PROTOCOL: |
Jan Engelhardt | 0d6038e | 2009-08-04 07:28:29 +0000 | [diff] [blame] | 568 | case SO_DOMAIN: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 569 | case SO_ERROR: |
| 570 | ret = -ENOPROTOOPT; |
| 571 | break; |
| 572 | case SO_DONTROUTE: |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 573 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 574 | break; |
| 575 | case SO_BROADCAST: |
| 576 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); |
| 577 | break; |
| 578 | case SO_SNDBUF: |
| 579 | /* Don't error on this BSD doesn't and if you think |
| 580 | about it this is right. Otherwise apps have to |
| 581 | play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 582 | are treated in BSD as hints */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 583 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 584 | if (val > sysctl_wmem_max) |
| 585 | val = sysctl_wmem_max; |
Patrick McHardy | b0573de | 2005-08-09 19:30:51 -0700 | [diff] [blame] | 586 | set_sndbuf: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 587 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| 588 | if ((val * 2) < SOCK_MIN_SNDBUF) |
| 589 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; |
| 590 | else |
| 591 | sk->sk_sndbuf = val * 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 593 | /* |
| 594 | * Wake up sending tasks if we |
| 595 | * upped the value. |
| 596 | */ |
| 597 | sk->sk_write_space(sk); |
| 598 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 600 | case SO_SNDBUFFORCE: |
| 601 | if (!capable(CAP_NET_ADMIN)) { |
| 602 | ret = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | break; |
| 604 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 605 | goto set_sndbuf; |
| 606 | |
| 607 | case SO_RCVBUF: |
| 608 | /* Don't error on this BSD doesn't and if you think |
| 609 | about it this is right. Otherwise apps have to |
| 610 | play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 611 | are treated in BSD as hints */ |
| 612 | |
| 613 | if (val > sysctl_rmem_max) |
| 614 | val = sysctl_rmem_max; |
| 615 | set_rcvbuf: |
| 616 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| 617 | /* |
| 618 | * We double it on the way in to account for |
| 619 | * "struct sk_buff" etc. overhead. Applications |
| 620 | * assume that the SO_RCVBUF setting they make will |
| 621 | * allow that much actual data to be received on that |
| 622 | * socket. |
| 623 | * |
| 624 | * Applications are unaware that "struct sk_buff" and |
| 625 | * other overheads allocate from the receive buffer |
| 626 | * during socket buffer allocation. |
| 627 | * |
| 628 | * And after considering the possible alternatives, |
| 629 | * returning the value we actually used in getsockopt |
| 630 | * is the most desirable behavior. |
| 631 | */ |
| 632 | if ((val * 2) < SOCK_MIN_RCVBUF) |
| 633 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; |
| 634 | else |
| 635 | sk->sk_rcvbuf = val * 2; |
| 636 | break; |
| 637 | |
| 638 | case SO_RCVBUFFORCE: |
| 639 | if (!capable(CAP_NET_ADMIN)) { |
| 640 | ret = -EPERM; |
| 641 | break; |
| 642 | } |
| 643 | goto set_rcvbuf; |
| 644 | |
| 645 | case SO_KEEPALIVE: |
| 646 | #ifdef CONFIG_INET |
| 647 | if (sk->sk_protocol == IPPROTO_TCP) |
| 648 | tcp_set_keepalive(sk, valbool); |
| 649 | #endif |
| 650 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
| 651 | break; |
| 652 | |
| 653 | case SO_OOBINLINE: |
| 654 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); |
| 655 | break; |
| 656 | |
| 657 | case SO_NO_CHECK: |
| 658 | sk->sk_no_check = valbool; |
| 659 | break; |
| 660 | |
| 661 | case SO_PRIORITY: |
| 662 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) |
| 663 | sk->sk_priority = val; |
| 664 | else |
| 665 | ret = -EPERM; |
| 666 | break; |
| 667 | |
| 668 | case SO_LINGER: |
| 669 | if (optlen < sizeof(ling)) { |
| 670 | ret = -EINVAL; /* 1003.1g */ |
| 671 | break; |
| 672 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 673 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 674 | ret = -EFAULT; |
| 675 | break; |
| 676 | } |
| 677 | if (!ling.l_onoff) |
| 678 | sock_reset_flag(sk, SOCK_LINGER); |
| 679 | else { |
| 680 | #if (BITS_PER_LONG == 32) |
| 681 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
| 682 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; |
| 683 | else |
| 684 | #endif |
| 685 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; |
| 686 | sock_set_flag(sk, SOCK_LINGER); |
| 687 | } |
| 688 | break; |
| 689 | |
| 690 | case SO_BSDCOMPAT: |
| 691 | sock_warn_obsolete_bsdism("setsockopt"); |
| 692 | break; |
| 693 | |
| 694 | case SO_PASSCRED: |
| 695 | if (valbool) |
| 696 | set_bit(SOCK_PASSCRED, &sock->flags); |
| 697 | else |
| 698 | clear_bit(SOCK_PASSCRED, &sock->flags); |
| 699 | break; |
| 700 | |
| 701 | case SO_TIMESTAMP: |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 702 | case SO_TIMESTAMPNS: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 703 | if (valbool) { |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 704 | if (optname == SO_TIMESTAMP) |
| 705 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| 706 | else |
| 707 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 708 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 709 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 710 | } else { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 711 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 712 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| 713 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 714 | break; |
| 715 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 716 | case SO_TIMESTAMPING: |
| 717 | if (val & ~SOF_TIMESTAMPING_MASK) { |
Rémi Denis-Courmont | f249fb7 | 2009-07-20 00:47:04 +0000 | [diff] [blame] | 718 | ret = -EINVAL; |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 719 | break; |
| 720 | } |
| 721 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, |
| 722 | val & SOF_TIMESTAMPING_TX_HARDWARE); |
| 723 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, |
| 724 | val & SOF_TIMESTAMPING_TX_SOFTWARE); |
| 725 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, |
| 726 | val & SOF_TIMESTAMPING_RX_HARDWARE); |
| 727 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
| 728 | sock_enable_timestamp(sk, |
| 729 | SOCK_TIMESTAMPING_RX_SOFTWARE); |
| 730 | else |
| 731 | sock_disable_timestamp(sk, |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 732 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 733 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, |
| 734 | val & SOF_TIMESTAMPING_SOFTWARE); |
| 735 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, |
| 736 | val & SOF_TIMESTAMPING_SYS_HARDWARE); |
| 737 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, |
| 738 | val & SOF_TIMESTAMPING_RAW_HARDWARE); |
| 739 | break; |
| 740 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 741 | case SO_RCVLOWAT: |
| 742 | if (val < 0) |
| 743 | val = INT_MAX; |
| 744 | sk->sk_rcvlowat = val ? : 1; |
| 745 | break; |
| 746 | |
| 747 | case SO_RCVTIMEO: |
| 748 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); |
| 749 | break; |
| 750 | |
| 751 | case SO_SNDTIMEO: |
| 752 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); |
| 753 | break; |
| 754 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 755 | case SO_ATTACH_FILTER: |
| 756 | ret = -EINVAL; |
| 757 | if (optlen == sizeof(struct sock_fprog)) { |
| 758 | struct sock_fprog fprog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 760 | ret = -EFAULT; |
| 761 | if (copy_from_user(&fprog, optval, sizeof(fprog))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 764 | ret = sk_attach_filter(&fprog, sk); |
| 765 | } |
| 766 | break; |
| 767 | |
| 768 | case SO_DETACH_FILTER: |
Pavel Emelyanov | 55b3332 | 2007-10-17 21:21:26 -0700 | [diff] [blame] | 769 | ret = sk_detach_filter(sk); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 770 | break; |
| 771 | |
| 772 | case SO_PASSSEC: |
| 773 | if (valbool) |
| 774 | set_bit(SOCK_PASSSEC, &sock->flags); |
| 775 | else |
| 776 | clear_bit(SOCK_PASSSEC, &sock->flags); |
| 777 | break; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 778 | case SO_MARK: |
| 779 | if (!capable(CAP_NET_ADMIN)) |
| 780 | ret = -EPERM; |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 781 | else |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 782 | sk->sk_mark = val; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 783 | break; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 784 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | /* We implement the SO_SNDLOWAT etc to |
| 786 | not be settable (1003.1g 5.3) */ |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 787 | case SO_RXQ_OVFL: |
Johannes Berg | 8083f0f | 2011-10-07 03:30:20 +0000 | [diff] [blame] | 788 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 789 | break; |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 790 | |
| 791 | case SO_WIFI_STATUS: |
| 792 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); |
| 793 | break; |
| 794 | |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 795 | case SO_PEEK_OFF: |
| 796 | if (sock->ops->set_peek_off) |
| 797 | sock->ops->set_peek_off(sk, val); |
| 798 | else |
| 799 | ret = -EOPNOTSUPP; |
| 800 | break; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 801 | |
| 802 | case SO_NOFCS: |
| 803 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); |
| 804 | break; |
| 805 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 806 | default: |
| 807 | ret = -ENOPROTOOPT; |
| 808 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 809 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | release_sock(sk); |
| 811 | return ret; |
| 812 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 813 | EXPORT_SYMBOL(sock_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
| 815 | |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 816 | void cred_to_ucred(struct pid *pid, const struct cred *cred, |
| 817 | struct ucred *ucred) |
| 818 | { |
| 819 | ucred->pid = pid_vnr(pid); |
| 820 | ucred->uid = ucred->gid = -1; |
| 821 | if (cred) { |
| 822 | struct user_namespace *current_ns = current_user_ns(); |
| 823 | |
| 824 | ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid); |
| 825 | ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid); |
| 826 | } |
| 827 | } |
David S. Miller | 3924773 | 2010-06-16 16:18:25 -0700 | [diff] [blame] | 828 | EXPORT_SYMBOL_GPL(cred_to_ucred); |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 829 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | int sock_getsockopt(struct socket *sock, int level, int optname, |
| 831 | char __user *optval, int __user *optlen) |
| 832 | { |
| 833 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 834 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 835 | union { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 836 | int val; |
| 837 | struct linger ling; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | struct timeval tm; |
| 839 | } v; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 840 | |
H Hartley Sweeten | 4d0392b | 2010-01-15 01:08:58 -0800 | [diff] [blame] | 841 | int lv = sizeof(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | int len; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 843 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 844 | if (get_user(len, optlen)) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 845 | return -EFAULT; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 846 | if (len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | return -EINVAL; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 848 | |
Eugene Teo | 50fee1d | 2009-02-23 15:38:41 -0800 | [diff] [blame] | 849 | memset(&v, 0, sizeof(v)); |
Clément Lecigne | df0bca0 | 2009-02-12 16:59:09 -0800 | [diff] [blame] | 850 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 851 | switch (optname) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 852 | case SO_DEBUG: |
| 853 | v.val = sock_flag(sk, SOCK_DBG); |
| 854 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 855 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 856 | case SO_DONTROUTE: |
| 857 | v.val = sock_flag(sk, SOCK_LOCALROUTE); |
| 858 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 859 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 860 | case SO_BROADCAST: |
| 861 | v.val = !!sock_flag(sk, SOCK_BROADCAST); |
| 862 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 864 | case SO_SNDBUF: |
| 865 | v.val = sk->sk_sndbuf; |
| 866 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 867 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 868 | case SO_RCVBUF: |
| 869 | v.val = sk->sk_rcvbuf; |
| 870 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 872 | case SO_REUSEADDR: |
| 873 | v.val = sk->sk_reuse; |
| 874 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 876 | case SO_KEEPALIVE: |
| 877 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); |
| 878 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 880 | case SO_TYPE: |
| 881 | v.val = sk->sk_type; |
| 882 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
Jan Engelhardt | 49c794e | 2009-08-04 07:28:28 +0000 | [diff] [blame] | 884 | case SO_PROTOCOL: |
| 885 | v.val = sk->sk_protocol; |
| 886 | break; |
| 887 | |
Jan Engelhardt | 0d6038e | 2009-08-04 07:28:29 +0000 | [diff] [blame] | 888 | case SO_DOMAIN: |
| 889 | v.val = sk->sk_family; |
| 890 | break; |
| 891 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 892 | case SO_ERROR: |
| 893 | v.val = -sock_error(sk); |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 894 | if (v.val == 0) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 895 | v.val = xchg(&sk->sk_err_soft, 0); |
| 896 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 898 | case SO_OOBINLINE: |
| 899 | v.val = !!sock_flag(sk, SOCK_URGINLINE); |
| 900 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 901 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 902 | case SO_NO_CHECK: |
| 903 | v.val = sk->sk_no_check; |
| 904 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 906 | case SO_PRIORITY: |
| 907 | v.val = sk->sk_priority; |
| 908 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 909 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 910 | case SO_LINGER: |
| 911 | lv = sizeof(v.ling); |
| 912 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); |
| 913 | v.ling.l_linger = sk->sk_lingertime / HZ; |
| 914 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 915 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 916 | case SO_BSDCOMPAT: |
| 917 | sock_warn_obsolete_bsdism("getsockopt"); |
| 918 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 920 | case SO_TIMESTAMP: |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 921 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
| 922 | !sock_flag(sk, SOCK_RCVTSTAMPNS); |
| 923 | break; |
| 924 | |
| 925 | case SO_TIMESTAMPNS: |
| 926 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 927 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 929 | case SO_TIMESTAMPING: |
| 930 | v.val = 0; |
| 931 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) |
| 932 | v.val |= SOF_TIMESTAMPING_TX_HARDWARE; |
| 933 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) |
| 934 | v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; |
| 935 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) |
| 936 | v.val |= SOF_TIMESTAMPING_RX_HARDWARE; |
| 937 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) |
| 938 | v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; |
| 939 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) |
| 940 | v.val |= SOF_TIMESTAMPING_SOFTWARE; |
| 941 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) |
| 942 | v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; |
| 943 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) |
| 944 | v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; |
| 945 | break; |
| 946 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 947 | case SO_RCVTIMEO: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 948 | lv = sizeof(struct timeval); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 949 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 950 | v.tm.tv_sec = 0; |
| 951 | v.tm.tv_usec = 0; |
| 952 | } else { |
| 953 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; |
| 954 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 956 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 958 | case SO_SNDTIMEO: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 959 | lv = sizeof(struct timeval); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 960 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 961 | v.tm.tv_sec = 0; |
| 962 | v.tm.tv_usec = 0; |
| 963 | } else { |
| 964 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; |
| 965 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; |
| 966 | } |
| 967 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 969 | case SO_RCVLOWAT: |
| 970 | v.val = sk->sk_rcvlowat; |
| 971 | break; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 972 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 973 | case SO_SNDLOWAT: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 974 | v.val = 1; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 975 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 977 | case SO_PASSCRED: |
| 978 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; |
| 979 | break; |
| 980 | |
| 981 | case SO_PEERCRED: |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 982 | { |
| 983 | struct ucred peercred; |
| 984 | if (len > sizeof(peercred)) |
| 985 | len = sizeof(peercred); |
| 986 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); |
| 987 | if (copy_to_user(optval, &peercred, len)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 988 | return -EFAULT; |
| 989 | goto lenout; |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 990 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 991 | |
| 992 | case SO_PEERNAME: |
| 993 | { |
| 994 | char address[128]; |
| 995 | |
| 996 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) |
| 997 | return -ENOTCONN; |
| 998 | if (lv < len) |
| 999 | return -EINVAL; |
| 1000 | if (copy_to_user(optval, address, len)) |
| 1001 | return -EFAULT; |
| 1002 | goto lenout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1004 | |
| 1005 | /* Dubious BSD thing... Probably nobody even uses it, but |
| 1006 | * the UNIX standard wants it for whatever reason... -DaveM |
| 1007 | */ |
| 1008 | case SO_ACCEPTCONN: |
| 1009 | v.val = sk->sk_state == TCP_LISTEN; |
| 1010 | break; |
| 1011 | |
| 1012 | case SO_PASSSEC: |
| 1013 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; |
| 1014 | break; |
| 1015 | |
| 1016 | case SO_PEERSEC: |
| 1017 | return security_socket_getpeersec_stream(sock, optval, optlen, len); |
| 1018 | |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 1019 | case SO_MARK: |
| 1020 | v.val = sk->sk_mark; |
| 1021 | break; |
| 1022 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1023 | case SO_RXQ_OVFL: |
| 1024 | v.val = !!sock_flag(sk, SOCK_RXQ_OVFL); |
| 1025 | break; |
| 1026 | |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 1027 | case SO_WIFI_STATUS: |
| 1028 | v.val = !!sock_flag(sk, SOCK_WIFI_STATUS); |
| 1029 | break; |
| 1030 | |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 1031 | case SO_PEEK_OFF: |
| 1032 | if (!sock->ops->set_peek_off) |
| 1033 | return -EOPNOTSUPP; |
| 1034 | |
| 1035 | v.val = sk->sk_peek_off; |
| 1036 | break; |
David S. Miller | bc2f799 | 2012-02-24 14:48:34 -0500 | [diff] [blame] | 1037 | case SO_NOFCS: |
| 1038 | v.val = !!sock_flag(sk, SOCK_NOFCS); |
| 1039 | break; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1040 | default: |
| 1041 | return -ENOPROTOOPT; |
| 1042 | } |
| 1043 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | if (len > lv) |
| 1045 | len = lv; |
| 1046 | if (copy_to_user(optval, &v, len)) |
| 1047 | return -EFAULT; |
| 1048 | lenout: |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1049 | if (put_user(len, optlen)) |
| 1050 | return -EFAULT; |
| 1051 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | } |
| 1053 | |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1054 | /* |
| 1055 | * Initialize an sk_lock. |
| 1056 | * |
| 1057 | * (We also register the sk_lock with the lock validator.) |
| 1058 | */ |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 1059 | static inline void sock_lock_init(struct sock *sk) |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1060 | { |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1061 | sock_lock_init_class_and_name(sk, |
| 1062 | af_family_slock_key_strings[sk->sk_family], |
| 1063 | af_family_slock_keys + sk->sk_family, |
| 1064 | af_family_key_strings[sk->sk_family], |
| 1065 | af_family_keys + sk->sk_family); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1066 | } |
| 1067 | |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 1068 | /* |
| 1069 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, |
| 1070 | * even temporarly, because of RCU lookups. sk_node should also be left as is. |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 1071 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 1072 | */ |
Pavel Emelyanov | f1a6c4d | 2007-11-01 00:29:45 -0700 | [diff] [blame] | 1073 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
| 1074 | { |
| 1075 | #ifdef CONFIG_SECURITY_NETWORK |
| 1076 | void *sptr = nsk->sk_security; |
| 1077 | #endif |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 1078 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
| 1079 | |
| 1080 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, |
| 1081 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); |
| 1082 | |
Pavel Emelyanov | f1a6c4d | 2007-11-01 00:29:45 -0700 | [diff] [blame] | 1083 | #ifdef CONFIG_SECURITY_NETWORK |
| 1084 | nsk->sk_security = sptr; |
| 1085 | security_sk_clone(osk, nsk); |
| 1086 | #endif |
| 1087 | } |
| 1088 | |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 1089 | /* |
| 1090 | * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes |
| 1091 | * un-modified. Special care is taken when initializing object to zero. |
| 1092 | */ |
| 1093 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) |
| 1094 | { |
| 1095 | if (offsetof(struct sock, sk_node.next) != 0) |
| 1096 | memset(sk, 0, offsetof(struct sock, sk_node.next)); |
| 1097 | memset(&sk->sk_node.pprev, 0, |
| 1098 | size - offsetof(struct sock, sk_node.pprev)); |
| 1099 | } |
| 1100 | |
| 1101 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) |
| 1102 | { |
| 1103 | unsigned long nulls1, nulls2; |
| 1104 | |
| 1105 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); |
| 1106 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); |
| 1107 | if (nulls1 > nulls2) |
| 1108 | swap(nulls1, nulls2); |
| 1109 | |
| 1110 | if (nulls1 != 0) |
| 1111 | memset((char *)sk, 0, nulls1); |
| 1112 | memset((char *)sk + nulls1 + sizeof(void *), 0, |
| 1113 | nulls2 - nulls1 - sizeof(void *)); |
| 1114 | memset((char *)sk + nulls2 + sizeof(void *), 0, |
| 1115 | size - nulls2 - sizeof(void *)); |
| 1116 | } |
| 1117 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); |
| 1118 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1119 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
| 1120 | int family) |
Pavel Emelyanov | c308c1b | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1121 | { |
| 1122 | struct sock *sk; |
| 1123 | struct kmem_cache *slab; |
| 1124 | |
| 1125 | slab = prot->slab; |
Eric Dumazet | e912b11 | 2009-07-08 19:36:05 +0000 | [diff] [blame] | 1126 | if (slab != NULL) { |
| 1127 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); |
| 1128 | if (!sk) |
| 1129 | return sk; |
| 1130 | if (priority & __GFP_ZERO) { |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 1131 | if (prot->clear_sk) |
| 1132 | prot->clear_sk(sk, prot->obj_size); |
| 1133 | else |
| 1134 | sk_prot_clear_nulls(sk, prot->obj_size); |
Eric Dumazet | e912b11 | 2009-07-08 19:36:05 +0000 | [diff] [blame] | 1135 | } |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 1136 | } else |
Pavel Emelyanov | c308c1b | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1137 | sk = kmalloc(prot->obj_size, priority); |
| 1138 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1139 | if (sk != NULL) { |
Vegard Nossum | a98b65a | 2009-02-26 14:46:57 +0100 | [diff] [blame] | 1140 | kmemcheck_annotate_bitfield(sk, flags); |
| 1141 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1142 | if (security_sk_alloc(sk, family, priority)) |
| 1143 | goto out_free; |
| 1144 | |
| 1145 | if (!try_module_get(prot->owner)) |
| 1146 | goto out_free_sec; |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1147 | sk_tx_queue_clear(sk); |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1148 | } |
| 1149 | |
Pavel Emelyanov | c308c1b | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1150 | return sk; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1151 | |
| 1152 | out_free_sec: |
| 1153 | security_sk_free(sk); |
| 1154 | out_free: |
| 1155 | if (slab != NULL) |
| 1156 | kmem_cache_free(slab, sk); |
| 1157 | else |
| 1158 | kfree(sk); |
| 1159 | return NULL; |
Pavel Emelyanov | c308c1b | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1160 | } |
| 1161 | |
| 1162 | static void sk_prot_free(struct proto *prot, struct sock *sk) |
| 1163 | { |
| 1164 | struct kmem_cache *slab; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1165 | struct module *owner; |
Pavel Emelyanov | c308c1b | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1166 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1167 | owner = prot->owner; |
Pavel Emelyanov | c308c1b | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1168 | slab = prot->slab; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1169 | |
| 1170 | security_sk_free(sk); |
Pavel Emelyanov | c308c1b | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1171 | if (slab != NULL) |
| 1172 | kmem_cache_free(slab, sk); |
| 1173 | else |
| 1174 | kfree(sk); |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1175 | module_put(owner); |
Pavel Emelyanov | c308c1b | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1176 | } |
| 1177 | |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1178 | #ifdef CONFIG_CGROUPS |
| 1179 | void sock_update_classid(struct sock *sk) |
| 1180 | { |
Paul E. McKenney | 1144182 | 2010-10-06 17:15:35 -0700 | [diff] [blame] | 1181 | u32 classid; |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1182 | |
Paul E. McKenney | 1144182 | 2010-10-06 17:15:35 -0700 | [diff] [blame] | 1183 | rcu_read_lock(); /* doing current task, which cannot vanish. */ |
| 1184 | classid = task_cls_classid(current); |
| 1185 | rcu_read_unlock(); |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1186 | if (classid && classid != sk->sk_classid) |
| 1187 | sk->sk_classid = classid; |
| 1188 | } |
Herbert Xu | 8286274 | 2010-05-24 00:14:10 -0700 | [diff] [blame] | 1189 | EXPORT_SYMBOL(sock_update_classid); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1190 | |
| 1191 | void sock_update_netprioidx(struct sock *sk) |
| 1192 | { |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1193 | if (in_interrupt()) |
| 1194 | return; |
Neil Horman | 2b73bc6 | 2012-02-10 05:43:38 +0000 | [diff] [blame] | 1195 | |
| 1196 | sk->sk_cgrp_prioidx = task_netprioidx(current); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1197 | } |
| 1198 | EXPORT_SYMBOL_GPL(sock_update_netprioidx); |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1199 | #endif |
| 1200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | /** |
| 1202 | * sk_alloc - All socket objects are allocated here |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1203 | * @net: the applicable net namespace |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1204 | * @family: protocol family |
| 1205 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 1206 | * @prot: struct proto associated with this new sock instance |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | */ |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 1208 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 1209 | struct proto *prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | { |
Pavel Emelyanov | c308c1b | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1211 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | |
Pavel Emelyanov | 154adbc | 2007-11-01 00:38:43 -0700 | [diff] [blame] | 1213 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | if (sk) { |
Pavel Emelyanov | 154adbc | 2007-11-01 00:38:43 -0700 | [diff] [blame] | 1215 | sk->sk_family = family; |
| 1216 | /* |
| 1217 | * See comment in struct sock definition to understand |
| 1218 | * why we need sk_prot_creator -acme |
| 1219 | */ |
| 1220 | sk->sk_prot = sk->sk_prot_creator = prot; |
| 1221 | sock_lock_init(sk); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1222 | sock_net_set(sk, get_net(net)); |
Jarek Poplawski | d66ee05 | 2009-08-30 23:15:36 +0000 | [diff] [blame] | 1223 | atomic_set(&sk->sk_wmem_alloc, 1); |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1224 | |
| 1225 | sock_update_classid(sk); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1226 | sock_update_netprioidx(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | } |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1228 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1229 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1231 | EXPORT_SYMBOL(sk_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1233 | static void __sk_free(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | { |
| 1235 | struct sk_filter *filter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | |
| 1237 | if (sk->sk_destruct) |
| 1238 | sk->sk_destruct(sk); |
| 1239 | |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 1240 | filter = rcu_dereference_check(sk->sk_filter, |
| 1241 | atomic_read(&sk->sk_wmem_alloc) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | if (filter) { |
Pavel Emelyanov | 309dd5f | 2007-10-17 21:21:51 -0700 | [diff] [blame] | 1243 | sk_filter_uncharge(sk, filter); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 1244 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | } |
| 1246 | |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 1247 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | |
| 1249 | if (atomic_read(&sk->sk_omem_alloc)) |
| 1250 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 1251 | __func__, atomic_read(&sk->sk_omem_alloc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1253 | if (sk->sk_peer_cred) |
| 1254 | put_cred(sk->sk_peer_cred); |
| 1255 | put_pid(sk->sk_peer_pid); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1256 | put_net(sock_net(sk)); |
Pavel Emelyanov | c308c1b | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1257 | sk_prot_free(sk->sk_prot_creator, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | } |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1259 | |
| 1260 | void sk_free(struct sock *sk) |
| 1261 | { |
| 1262 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1263 | * We subtract one from sk_wmem_alloc and can know if |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1264 | * some packets are still in some tx queue. |
| 1265 | * If not null, sock_wfree() will call __sk_free(sk) later |
| 1266 | */ |
| 1267 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) |
| 1268 | __sk_free(sk); |
| 1269 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1270 | EXPORT_SYMBOL(sk_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1272 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1273 | * Last sock_put should drop reference to sk->sk_net. It has already |
| 1274 | * been dropped in sk_change_net. Taking reference to stopping namespace |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1275 | * is not an option. |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1276 | * Take reference to a socket to remove it from hash _alive_ and after that |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1277 | * destroy it in the context of init_net. |
| 1278 | */ |
| 1279 | void sk_release_kernel(struct sock *sk) |
| 1280 | { |
| 1281 | if (sk == NULL || sk->sk_socket == NULL) |
| 1282 | return; |
| 1283 | |
| 1284 | sock_hold(sk); |
| 1285 | sock_release(sk->sk_socket); |
Denis V. Lunev | 65a18ec | 2008-04-16 01:59:46 -0700 | [diff] [blame] | 1286 | release_net(sock_net(sk)); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1287 | sock_net_set(sk, get_net(&init_net)); |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1288 | sock_put(sk); |
| 1289 | } |
David S. Miller | 45af175 | 2008-02-29 11:33:19 -0800 | [diff] [blame] | 1290 | EXPORT_SYMBOL(sk_release_kernel); |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1291 | |
Stephen Rothwell | 475f1b5 | 2012-01-09 16:33:16 +1100 | [diff] [blame] | 1292 | static void sk_update_clone(const struct sock *sk, struct sock *newsk) |
| 1293 | { |
| 1294 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
| 1295 | sock_update_memcg(newsk); |
| 1296 | } |
| 1297 | |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 1298 | /** |
| 1299 | * sk_clone_lock - clone a socket, and lock its clone |
| 1300 | * @sk: the socket to clone |
| 1301 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 1302 | * |
| 1303 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) |
| 1304 | */ |
| 1305 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1306 | { |
Pavel Emelyanov | 8fd1d17 | 2007-11-01 00:37:32 -0700 | [diff] [blame] | 1307 | struct sock *newsk; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1308 | |
Pavel Emelyanov | 8fd1d17 | 2007-11-01 00:37:32 -0700 | [diff] [blame] | 1309 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1310 | if (newsk != NULL) { |
| 1311 | struct sk_filter *filter; |
| 1312 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 1313 | sock_copy(newsk, sk); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1314 | |
| 1315 | /* SANITY */ |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1316 | get_net(sock_net(newsk)); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1317 | sk_node_init(&newsk->sk_node); |
| 1318 | sock_lock_init(newsk); |
| 1319 | bh_lock_sock(newsk); |
Eric Dumazet | fa438cc | 2007-03-04 16:05:44 -0800 | [diff] [blame] | 1320 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 1321 | newsk->sk_backlog.len = 0; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1322 | |
| 1323 | atomic_set(&newsk->sk_rmem_alloc, 0); |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1324 | /* |
| 1325 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) |
| 1326 | */ |
| 1327 | atomic_set(&newsk->sk_wmem_alloc, 1); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1328 | atomic_set(&newsk->sk_omem_alloc, 0); |
| 1329 | skb_queue_head_init(&newsk->sk_receive_queue); |
| 1330 | skb_queue_head_init(&newsk->sk_write_queue); |
Chris Leech | 97fc2f0 | 2006-05-23 17:55:33 -0700 | [diff] [blame] | 1331 | #ifdef CONFIG_NET_DMA |
| 1332 | skb_queue_head_init(&newsk->sk_async_wait_queue); |
| 1333 | #endif |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1334 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1335 | spin_lock_init(&newsk->sk_dst_lock); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1336 | rwlock_init(&newsk->sk_callback_lock); |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 1337 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
| 1338 | af_callback_keys + newsk->sk_family, |
| 1339 | af_family_clock_key_strings[newsk->sk_family]); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1340 | |
| 1341 | newsk->sk_dst_cache = NULL; |
| 1342 | newsk->sk_wmem_queued = 0; |
| 1343 | newsk->sk_forward_alloc = 0; |
| 1344 | newsk->sk_send_head = NULL; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1345 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
| 1346 | |
| 1347 | sock_reset_flag(newsk, SOCK_DONE); |
| 1348 | skb_queue_head_init(&newsk->sk_error_queue); |
| 1349 | |
Eric Dumazet | 0d7da9d | 2010-10-25 03:47:05 +0000 | [diff] [blame] | 1350 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1351 | if (filter != NULL) |
| 1352 | sk_filter_charge(newsk, filter); |
| 1353 | |
| 1354 | if (unlikely(xfrm_sk_clone_policy(newsk))) { |
| 1355 | /* It is still raw copy of parent, so invalidate |
| 1356 | * destructor and make plain sk_free() */ |
| 1357 | newsk->sk_destruct = NULL; |
Thomas Gleixner | b0691c8 | 2011-10-25 02:30:50 +0000 | [diff] [blame] | 1358 | bh_unlock_sock(newsk); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1359 | sk_free(newsk); |
| 1360 | newsk = NULL; |
| 1361 | goto out; |
| 1362 | } |
| 1363 | |
| 1364 | newsk->sk_err = 0; |
| 1365 | newsk->sk_priority = 0; |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 1366 | /* |
| 1367 | * Before updating sk_refcnt, we must commit prior changes to memory |
| 1368 | * (Documentation/RCU/rculist_nulls.txt for details) |
| 1369 | */ |
| 1370 | smp_wmb(); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1371 | atomic_set(&newsk->sk_refcnt, 2); |
| 1372 | |
| 1373 | /* |
| 1374 | * Increment the counter in the same struct proto as the master |
| 1375 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that |
| 1376 | * is the same as sk->sk_prot->socks, as this field was copied |
| 1377 | * with memcpy). |
| 1378 | * |
| 1379 | * This _changes_ the previous behaviour, where |
| 1380 | * tcp_create_openreq_child always was incrementing the |
| 1381 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have |
| 1382 | * to be taken into account in all callers. -acme |
| 1383 | */ |
| 1384 | sk_refcnt_debug_inc(newsk); |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1385 | sk_set_socket(newsk, NULL); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1386 | newsk->sk_wq = NULL; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1387 | |
Glauber Costa | f3f511e | 2012-01-05 20:16:39 +0000 | [diff] [blame] | 1388 | sk_update_clone(sk, newsk); |
| 1389 | |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1390 | if (newsk->sk_prot->sockets_allocated) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1391 | sk_sockets_allocated_inc(newsk); |
Octavian Purdila | 704da560 | 2010-01-08 00:00:09 -0800 | [diff] [blame] | 1392 | |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 1393 | if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) |
Octavian Purdila | 704da560 | 2010-01-08 00:00:09 -0800 | [diff] [blame] | 1394 | net_enable_timestamp(); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1395 | } |
| 1396 | out: |
| 1397 | return newsk; |
| 1398 | } |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 1399 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1400 | |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1401 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
| 1402 | { |
| 1403 | __sk_dst_set(sk, dst); |
| 1404 | sk->sk_route_caps = dst->dev->features; |
| 1405 | if (sk->sk_route_caps & NETIF_F_GSO) |
Herbert Xu | 4fcd6b9 | 2007-05-31 22:15:50 -0700 | [diff] [blame] | 1406 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1407 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1408 | if (sk_can_gso(sk)) { |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1409 | if (dst->header_len) { |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1410 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1411 | } else { |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1412 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1413 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
| 1414 | } |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1415 | } |
| 1416 | } |
| 1417 | EXPORT_SYMBOL_GPL(sk_setup_caps); |
| 1418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | void __init sk_init(void) |
| 1420 | { |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 1421 | if (totalram_pages <= 4096) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | sysctl_wmem_max = 32767; |
| 1423 | sysctl_rmem_max = 32767; |
| 1424 | sysctl_wmem_default = 32767; |
| 1425 | sysctl_rmem_default = 32767; |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 1426 | } else if (totalram_pages >= 131072) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | sysctl_wmem_max = 131071; |
| 1428 | sysctl_rmem_max = 131071; |
| 1429 | } |
| 1430 | } |
| 1431 | |
| 1432 | /* |
| 1433 | * Simple resource managers for sockets. |
| 1434 | */ |
| 1435 | |
| 1436 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1437 | /* |
| 1438 | * Write buffer destructor automatically called from kfree_skb. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | */ |
| 1440 | void sock_wfree(struct sk_buff *skb) |
| 1441 | { |
| 1442 | struct sock *sk = skb->sk; |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1443 | unsigned int len = skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1445 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
| 1446 | /* |
| 1447 | * Keep a reference on sk_wmem_alloc, this will be released |
| 1448 | * after sk_write_space() call |
| 1449 | */ |
| 1450 | atomic_sub(len - 1, &sk->sk_wmem_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | sk->sk_write_space(sk); |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1452 | len = 1; |
| 1453 | } |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1454 | /* |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1455 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
| 1456 | * could not do because of in-flight packets |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1457 | */ |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1458 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1459 | __sk_free(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1461 | EXPORT_SYMBOL(sock_wfree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1463 | /* |
| 1464 | * Read buffer destructor automatically called from kfree_skb. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | */ |
| 1466 | void sock_rfree(struct sk_buff *skb) |
| 1467 | { |
| 1468 | struct sock *sk = skb->sk; |
Eric Dumazet | d361fd5 | 2010-07-10 22:45:17 +0000 | [diff] [blame] | 1469 | unsigned int len = skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | |
Eric Dumazet | d361fd5 | 2010-07-10 22:45:17 +0000 | [diff] [blame] | 1471 | atomic_sub(len, &sk->sk_rmem_alloc); |
| 1472 | sk_mem_uncharge(sk, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1474 | EXPORT_SYMBOL(sock_rfree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | |
| 1476 | |
| 1477 | int sock_i_uid(struct sock *sk) |
| 1478 | { |
| 1479 | int uid; |
| 1480 | |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1481 | read_lock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1483 | read_unlock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | return uid; |
| 1485 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1486 | EXPORT_SYMBOL(sock_i_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | |
| 1488 | unsigned long sock_i_ino(struct sock *sk) |
| 1489 | { |
| 1490 | unsigned long ino; |
| 1491 | |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1492 | read_lock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1494 | read_unlock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | return ino; |
| 1496 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1497 | EXPORT_SYMBOL(sock_i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | |
| 1499 | /* |
| 1500 | * Allocate a skb from the socket's send buffer. |
| 1501 | */ |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 1502 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1503 | gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | { |
| 1505 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1506 | struct sk_buff *skb = alloc_skb(size, priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | if (skb) { |
| 1508 | skb_set_owner_w(skb, sk); |
| 1509 | return skb; |
| 1510 | } |
| 1511 | } |
| 1512 | return NULL; |
| 1513 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1514 | EXPORT_SYMBOL(sock_wmalloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | |
| 1516 | /* |
| 1517 | * Allocate a skb from the socket's receive buffer. |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1518 | */ |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 1519 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1520 | gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | { |
| 1522 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
| 1523 | struct sk_buff *skb = alloc_skb(size, priority); |
| 1524 | if (skb) { |
| 1525 | skb_set_owner_r(skb, sk); |
| 1526 | return skb; |
| 1527 | } |
| 1528 | } |
| 1529 | return NULL; |
| 1530 | } |
| 1531 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1532 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | * Allocate a memory block from the socket's option memory buffer. |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1534 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1535 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | { |
| 1537 | if ((unsigned)size <= sysctl_optmem_max && |
| 1538 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
| 1539 | void *mem; |
| 1540 | /* First do the add, to avoid the race if kmalloc |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1541 | * might sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | */ |
| 1543 | atomic_add(size, &sk->sk_omem_alloc); |
| 1544 | mem = kmalloc(size, priority); |
| 1545 | if (mem) |
| 1546 | return mem; |
| 1547 | atomic_sub(size, &sk->sk_omem_alloc); |
| 1548 | } |
| 1549 | return NULL; |
| 1550 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1551 | EXPORT_SYMBOL(sock_kmalloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | |
| 1553 | /* |
| 1554 | * Free an option memory block. |
| 1555 | */ |
| 1556 | void sock_kfree_s(struct sock *sk, void *mem, int size) |
| 1557 | { |
| 1558 | kfree(mem); |
| 1559 | atomic_sub(size, &sk->sk_omem_alloc); |
| 1560 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1561 | EXPORT_SYMBOL(sock_kfree_s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | |
| 1563 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
| 1564 | I think, these locks should be removed for datagram sockets. |
| 1565 | */ |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1566 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | { |
| 1568 | DEFINE_WAIT(wait); |
| 1569 | |
| 1570 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 1571 | for (;;) { |
| 1572 | if (!timeo) |
| 1573 | break; |
| 1574 | if (signal_pending(current)) |
| 1575 | break; |
| 1576 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1577 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
| 1579 | break; |
| 1580 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1581 | break; |
| 1582 | if (sk->sk_err) |
| 1583 | break; |
| 1584 | timeo = schedule_timeout(timeo); |
| 1585 | } |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1586 | finish_wait(sk_sleep(sk), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | return timeo; |
| 1588 | } |
| 1589 | |
| 1590 | |
| 1591 | /* |
| 1592 | * Generic send/receive buffer handlers |
| 1593 | */ |
| 1594 | |
Herbert Xu | 4cc7f68 | 2009-02-04 16:55:54 -0800 | [diff] [blame] | 1595 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
| 1596 | unsigned long data_len, int noblock, |
| 1597 | int *errcode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | { |
| 1599 | struct sk_buff *skb; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 1600 | gfp_t gfp_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | long timeo; |
| 1602 | int err; |
Jason Wang | 1b92565 | 2012-05-30 21:18:10 +0000 | [diff] [blame] | 1603 | int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; |
| 1604 | |
| 1605 | err = -EMSGSIZE; |
| 1606 | if (npages > MAX_SKB_FRAGS) |
| 1607 | goto failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | |
| 1609 | gfp_mask = sk->sk_allocation; |
| 1610 | if (gfp_mask & __GFP_WAIT) |
| 1611 | gfp_mask |= __GFP_REPEAT; |
| 1612 | |
| 1613 | timeo = sock_sndtimeo(sk, noblock); |
| 1614 | while (1) { |
| 1615 | err = sock_error(sk); |
| 1616 | if (err != 0) |
| 1617 | goto failure; |
| 1618 | |
| 1619 | err = -EPIPE; |
| 1620 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1621 | goto failure; |
| 1622 | |
| 1623 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
Larry Woodman | db38c179 | 2006-11-03 16:05:45 -0800 | [diff] [blame] | 1624 | skb = alloc_skb(header_len, gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | if (skb) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | int i; |
| 1627 | |
| 1628 | /* No pages, we're done... */ |
| 1629 | if (!data_len) |
| 1630 | break; |
| 1631 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | skb->truesize += data_len; |
| 1633 | skb_shinfo(skb)->nr_frags = npages; |
| 1634 | for (i = 0; i < npages; i++) { |
| 1635 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | |
| 1637 | page = alloc_pages(sk->sk_allocation, 0); |
| 1638 | if (!page) { |
| 1639 | err = -ENOBUFS; |
| 1640 | skb_shinfo(skb)->nr_frags = i; |
| 1641 | kfree_skb(skb); |
| 1642 | goto failure; |
| 1643 | } |
| 1644 | |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 1645 | __skb_fill_page_desc(skb, i, |
| 1646 | page, 0, |
| 1647 | (data_len >= PAGE_SIZE ? |
| 1648 | PAGE_SIZE : |
| 1649 | data_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | data_len -= PAGE_SIZE; |
| 1651 | } |
| 1652 | |
| 1653 | /* Full success... */ |
| 1654 | break; |
| 1655 | } |
| 1656 | err = -ENOBUFS; |
| 1657 | goto failure; |
| 1658 | } |
| 1659 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 1660 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 1661 | err = -EAGAIN; |
| 1662 | if (!timeo) |
| 1663 | goto failure; |
| 1664 | if (signal_pending(current)) |
| 1665 | goto interrupted; |
| 1666 | timeo = sock_wait_for_wmem(sk, timeo); |
| 1667 | } |
| 1668 | |
| 1669 | skb_set_owner_w(skb, sk); |
| 1670 | return skb; |
| 1671 | |
| 1672 | interrupted: |
| 1673 | err = sock_intr_errno(timeo); |
| 1674 | failure: |
| 1675 | *errcode = err; |
| 1676 | return NULL; |
| 1677 | } |
Herbert Xu | 4cc7f68 | 2009-02-04 16:55:54 -0800 | [diff] [blame] | 1678 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1680 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | int noblock, int *errcode) |
| 1682 | { |
| 1683 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); |
| 1684 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1685 | EXPORT_SYMBOL(sock_alloc_send_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | |
| 1687 | static void __lock_sock(struct sock *sk) |
Namhyung Kim | f39234d | 2010-09-08 03:48:48 +0000 | [diff] [blame] | 1688 | __releases(&sk->sk_lock.slock) |
| 1689 | __acquires(&sk->sk_lock.slock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | { |
| 1691 | DEFINE_WAIT(wait); |
| 1692 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1693 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
| 1695 | TASK_UNINTERRUPTIBLE); |
| 1696 | spin_unlock_bh(&sk->sk_lock.slock); |
| 1697 | schedule(); |
| 1698 | spin_lock_bh(&sk->sk_lock.slock); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1699 | if (!sock_owned_by_user(sk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | break; |
| 1701 | } |
| 1702 | finish_wait(&sk->sk_lock.wq, &wait); |
| 1703 | } |
| 1704 | |
| 1705 | static void __release_sock(struct sock *sk) |
Namhyung Kim | f39234d | 2010-09-08 03:48:48 +0000 | [diff] [blame] | 1706 | __releases(&sk->sk_lock.slock) |
| 1707 | __acquires(&sk->sk_lock.slock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | { |
| 1709 | struct sk_buff *skb = sk->sk_backlog.head; |
| 1710 | |
| 1711 | do { |
| 1712 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
| 1713 | bh_unlock_sock(sk); |
| 1714 | |
| 1715 | do { |
| 1716 | struct sk_buff *next = skb->next; |
| 1717 | |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 1718 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | skb->next = NULL; |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 1720 | sk_backlog_rcv(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | |
| 1722 | /* |
| 1723 | * We are in process context here with softirqs |
| 1724 | * disabled, use cond_resched_softirq() to preempt. |
| 1725 | * This is safe to do because we've taken the backlog |
| 1726 | * queue private: |
| 1727 | */ |
| 1728 | cond_resched_softirq(); |
| 1729 | |
| 1730 | skb = next; |
| 1731 | } while (skb != NULL); |
| 1732 | |
| 1733 | bh_lock_sock(sk); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1734 | } while ((skb = sk->sk_backlog.head) != NULL); |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 1735 | |
| 1736 | /* |
| 1737 | * Doing the zeroing here guarantee we can not loop forever |
| 1738 | * while a wild producer attempts to flood us. |
| 1739 | */ |
| 1740 | sk->sk_backlog.len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1741 | } |
| 1742 | |
| 1743 | /** |
| 1744 | * sk_wait_data - wait for data to arrive at sk_receive_queue |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1745 | * @sk: sock to wait on |
| 1746 | * @timeo: for how long |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | * |
| 1748 | * Now socket state including sk->sk_err is changed only under lock, |
| 1749 | * hence we may omit checks after joining wait queue. |
| 1750 | * We check receive queue before schedule() only as optimization; |
| 1751 | * it is very likely that release_sock() added new data. |
| 1752 | */ |
| 1753 | int sk_wait_data(struct sock *sk, long *timeo) |
| 1754 | { |
| 1755 | int rc; |
| 1756 | DEFINE_WAIT(wait); |
| 1757 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1758 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
| 1760 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); |
| 1761 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1762 | finish_wait(sk_sleep(sk), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | return rc; |
| 1764 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | EXPORT_SYMBOL(sk_wait_data); |
| 1766 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1767 | /** |
| 1768 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated |
| 1769 | * @sk: socket |
| 1770 | * @size: memory size to allocate |
| 1771 | * @kind: allocation type |
| 1772 | * |
| 1773 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means |
| 1774 | * rmem allocation. This function assumes that protocols which have |
| 1775 | * memory_pressure use sk_wmem_queued as write buffer accounting. |
| 1776 | */ |
| 1777 | int __sk_mem_schedule(struct sock *sk, int size, int kind) |
| 1778 | { |
| 1779 | struct proto *prot = sk->sk_prot; |
| 1780 | int amt = sk_mem_pages(size); |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 1781 | long allocated; |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1782 | int parent_status = UNDER_LIMIT; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1783 | |
| 1784 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1785 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1786 | allocated = sk_memory_allocated_add(sk, amt, &parent_status); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1787 | |
| 1788 | /* Under limit. */ |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1789 | if (parent_status == UNDER_LIMIT && |
| 1790 | allocated <= sk_prot_mem_limits(sk, 0)) { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1791 | sk_leave_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1792 | return 1; |
| 1793 | } |
| 1794 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1795 | /* Under pressure. (we or our parents) */ |
| 1796 | if ((parent_status > SOFT_LIMIT) || |
| 1797 | allocated > sk_prot_mem_limits(sk, 1)) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1798 | sk_enter_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1799 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1800 | /* Over hard limit (we or our parents) */ |
| 1801 | if ((parent_status == OVER_LIMIT) || |
| 1802 | (allocated > sk_prot_mem_limits(sk, 2))) |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1803 | goto suppress_allocation; |
| 1804 | |
| 1805 | /* guarantee minimum buffer size under pressure */ |
| 1806 | if (kind == SK_MEM_RECV) { |
| 1807 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) |
| 1808 | return 1; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1809 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1810 | } else { /* SK_MEM_SEND */ |
| 1811 | if (sk->sk_type == SOCK_STREAM) { |
| 1812 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) |
| 1813 | return 1; |
| 1814 | } else if (atomic_read(&sk->sk_wmem_alloc) < |
| 1815 | prot->sysctl_wmem[0]) |
| 1816 | return 1; |
| 1817 | } |
| 1818 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1819 | if (sk_has_memory_pressure(sk)) { |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 1820 | int alloc; |
| 1821 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1822 | if (!sk_under_memory_pressure(sk)) |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 1823 | return 1; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1824 | alloc = sk_sockets_allocated_read_positive(sk); |
| 1825 | if (sk_prot_mem_limits(sk, 2) > alloc * |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1826 | sk_mem_pages(sk->sk_wmem_queued + |
| 1827 | atomic_read(&sk->sk_rmem_alloc) + |
| 1828 | sk->sk_forward_alloc)) |
| 1829 | return 1; |
| 1830 | } |
| 1831 | |
| 1832 | suppress_allocation: |
| 1833 | |
| 1834 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { |
| 1835 | sk_stream_moderate_sndbuf(sk); |
| 1836 | |
| 1837 | /* Fail only if socket is _under_ its sndbuf. |
| 1838 | * In this case we cannot block, so that we have to fail. |
| 1839 | */ |
| 1840 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) |
| 1841 | return 1; |
| 1842 | } |
| 1843 | |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 1844 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
| 1845 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1846 | /* Alas. Undo changes. */ |
| 1847 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1848 | |
Glauber Costa | 0e90b31 | 2012-01-20 04:57:16 +0000 | [diff] [blame] | 1849 | sk_memory_allocated_sub(sk, amt); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1850 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1851 | return 0; |
| 1852 | } |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1853 | EXPORT_SYMBOL(__sk_mem_schedule); |
| 1854 | |
| 1855 | /** |
| 1856 | * __sk_reclaim - reclaim memory_allocated |
| 1857 | * @sk: socket |
| 1858 | */ |
| 1859 | void __sk_mem_reclaim(struct sock *sk) |
| 1860 | { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1861 | sk_memory_allocated_sub(sk, |
Glauber Costa | 0e90b31 | 2012-01-20 04:57:16 +0000 | [diff] [blame] | 1862 | sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1863 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; |
| 1864 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1865 | if (sk_under_memory_pressure(sk) && |
| 1866 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) |
| 1867 | sk_leave_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1868 | } |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1869 | EXPORT_SYMBOL(__sk_mem_reclaim); |
| 1870 | |
| 1871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | /* |
| 1873 | * Set of default routines for initialising struct proto_ops when |
| 1874 | * the protocol does not support a particular function. In certain |
| 1875 | * cases where it makes no sense for a protocol to have a "do nothing" |
| 1876 | * function, some default processing is provided. |
| 1877 | */ |
| 1878 | |
| 1879 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) |
| 1880 | { |
| 1881 | return -EOPNOTSUPP; |
| 1882 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1883 | EXPORT_SYMBOL(sock_no_bind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1885 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | int len, int flags) |
| 1887 | { |
| 1888 | return -EOPNOTSUPP; |
| 1889 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1890 | EXPORT_SYMBOL(sock_no_connect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | |
| 1892 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) |
| 1893 | { |
| 1894 | return -EOPNOTSUPP; |
| 1895 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1896 | EXPORT_SYMBOL(sock_no_socketpair); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | |
| 1898 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) |
| 1899 | { |
| 1900 | return -EOPNOTSUPP; |
| 1901 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1902 | EXPORT_SYMBOL(sock_no_accept); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1904 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | int *len, int peer) |
| 1906 | { |
| 1907 | return -EOPNOTSUPP; |
| 1908 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1909 | EXPORT_SYMBOL(sock_no_getname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1911 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | { |
| 1913 | return 0; |
| 1914 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1915 | EXPORT_SYMBOL(sock_no_poll); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | |
| 1917 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 1918 | { |
| 1919 | return -EOPNOTSUPP; |
| 1920 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1921 | EXPORT_SYMBOL(sock_no_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | |
| 1923 | int sock_no_listen(struct socket *sock, int backlog) |
| 1924 | { |
| 1925 | return -EOPNOTSUPP; |
| 1926 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1927 | EXPORT_SYMBOL(sock_no_listen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1928 | |
| 1929 | int sock_no_shutdown(struct socket *sock, int how) |
| 1930 | { |
| 1931 | return -EOPNOTSUPP; |
| 1932 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1933 | EXPORT_SYMBOL(sock_no_shutdown); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | |
| 1935 | int sock_no_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1936 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | { |
| 1938 | return -EOPNOTSUPP; |
| 1939 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1940 | EXPORT_SYMBOL(sock_no_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | |
| 1942 | int sock_no_getsockopt(struct socket *sock, int level, int optname, |
| 1943 | char __user *optval, int __user *optlen) |
| 1944 | { |
| 1945 | return -EOPNOTSUPP; |
| 1946 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1947 | EXPORT_SYMBOL(sock_no_getsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | |
| 1949 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, |
| 1950 | size_t len) |
| 1951 | { |
| 1952 | return -EOPNOTSUPP; |
| 1953 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1954 | EXPORT_SYMBOL(sock_no_sendmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | |
| 1956 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, |
| 1957 | size_t len, int flags) |
| 1958 | { |
| 1959 | return -EOPNOTSUPP; |
| 1960 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1961 | EXPORT_SYMBOL(sock_no_recvmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | |
| 1963 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) |
| 1964 | { |
| 1965 | /* Mirror missing mmap method error code */ |
| 1966 | return -ENODEV; |
| 1967 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1968 | EXPORT_SYMBOL(sock_no_mmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | |
| 1970 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) |
| 1971 | { |
| 1972 | ssize_t res; |
| 1973 | struct msghdr msg = {.msg_flags = flags}; |
| 1974 | struct kvec iov; |
| 1975 | char *kaddr = kmap(page); |
| 1976 | iov.iov_base = kaddr + offset; |
| 1977 | iov.iov_len = size; |
| 1978 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); |
| 1979 | kunmap(page); |
| 1980 | return res; |
| 1981 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1982 | EXPORT_SYMBOL(sock_no_sendpage); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | |
| 1984 | /* |
| 1985 | * Default Socket Callbacks |
| 1986 | */ |
| 1987 | |
| 1988 | static void sock_def_wakeup(struct sock *sk) |
| 1989 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1990 | struct socket_wq *wq; |
| 1991 | |
| 1992 | rcu_read_lock(); |
| 1993 | wq = rcu_dereference(sk->sk_wq); |
| 1994 | if (wq_has_sleeper(wq)) |
| 1995 | wake_up_interruptible_all(&wq->wait); |
| 1996 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | } |
| 1998 | |
| 1999 | static void sock_def_error_report(struct sock *sk) |
| 2000 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2001 | struct socket_wq *wq; |
| 2002 | |
| 2003 | rcu_read_lock(); |
| 2004 | wq = rcu_dereference(sk->sk_wq); |
| 2005 | if (wq_has_sleeper(wq)) |
| 2006 | wake_up_interruptible_poll(&wq->wait, POLLERR); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2007 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2008 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | } |
| 2010 | |
| 2011 | static void sock_def_readable(struct sock *sk, int len) |
| 2012 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2013 | struct socket_wq *wq; |
| 2014 | |
| 2015 | rcu_read_lock(); |
| 2016 | wq = rcu_dereference(sk->sk_wq); |
| 2017 | if (wq_has_sleeper(wq)) |
Eric Dumazet | 2c6607c | 2011-01-06 10:54:29 -0800 | [diff] [blame] | 2018 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
Davide Libenzi | 37e5540 | 2009-03-31 15:24:21 -0700 | [diff] [blame] | 2019 | POLLRDNORM | POLLRDBAND); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2020 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2021 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | } |
| 2023 | |
| 2024 | static void sock_def_write_space(struct sock *sk) |
| 2025 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2026 | struct socket_wq *wq; |
| 2027 | |
| 2028 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2029 | |
| 2030 | /* Do not wake up a writer until he can make "significant" |
| 2031 | * progress. --DaveM |
| 2032 | */ |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 2033 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2034 | wq = rcu_dereference(sk->sk_wq); |
| 2035 | if (wq_has_sleeper(wq)) |
| 2036 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
Davide Libenzi | 37e5540 | 2009-03-31 15:24:21 -0700 | [diff] [blame] | 2037 | POLLWRNORM | POLLWRBAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | |
| 2039 | /* Should agree with poll, otherwise some programs break */ |
| 2040 | if (sock_writeable(sk)) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2041 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2042 | } |
| 2043 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2044 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | } |
| 2046 | |
| 2047 | static void sock_def_destruct(struct sock *sk) |
| 2048 | { |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 2049 | kfree(sk->sk_protinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | } |
| 2051 | |
| 2052 | void sk_send_sigurg(struct sock *sk) |
| 2053 | { |
| 2054 | if (sk->sk_socket && sk->sk_socket->file) |
| 2055 | if (send_sigurg(&sk->sk_socket->file->f_owner)) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2056 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2058 | EXPORT_SYMBOL(sk_send_sigurg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | |
| 2060 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, |
| 2061 | unsigned long expires) |
| 2062 | { |
| 2063 | if (!mod_timer(timer, expires)) |
| 2064 | sock_hold(sk); |
| 2065 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | EXPORT_SYMBOL(sk_reset_timer); |
| 2067 | |
| 2068 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) |
| 2069 | { |
| 2070 | if (timer_pending(timer) && del_timer(timer)) |
| 2071 | __sock_put(sk); |
| 2072 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | EXPORT_SYMBOL(sk_stop_timer); |
| 2074 | |
| 2075 | void sock_init_data(struct socket *sock, struct sock *sk) |
| 2076 | { |
| 2077 | skb_queue_head_init(&sk->sk_receive_queue); |
| 2078 | skb_queue_head_init(&sk->sk_write_queue); |
| 2079 | skb_queue_head_init(&sk->sk_error_queue); |
Chris Leech | 97fc2f0 | 2006-05-23 17:55:33 -0700 | [diff] [blame] | 2080 | #ifdef CONFIG_NET_DMA |
| 2081 | skb_queue_head_init(&sk->sk_async_wait_queue); |
| 2082 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | |
| 2084 | sk->sk_send_head = NULL; |
| 2085 | |
| 2086 | init_timer(&sk->sk_timer); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2087 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | sk->sk_allocation = GFP_KERNEL; |
| 2089 | sk->sk_rcvbuf = sysctl_rmem_default; |
| 2090 | sk->sk_sndbuf = sysctl_wmem_default; |
| 2091 | sk->sk_state = TCP_CLOSE; |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 2092 | sk_set_socket(sk, sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | |
| 2094 | sock_set_flag(sk, SOCK_ZAPPED); |
| 2095 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 2096 | if (sock) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | sk->sk_type = sock->type; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2098 | sk->sk_wq = sock->wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | sock->sk = sk; |
| 2100 | } else |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2101 | sk->sk_wq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 2103 | spin_lock_init(&sk->sk_dst_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | rwlock_init(&sk->sk_callback_lock); |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 2105 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
| 2106 | af_callback_keys + sk->sk_family, |
| 2107 | af_family_clock_key_strings[sk->sk_family]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | |
| 2109 | sk->sk_state_change = sock_def_wakeup; |
| 2110 | sk->sk_data_ready = sock_def_readable; |
| 2111 | sk->sk_write_space = sock_def_write_space; |
| 2112 | sk->sk_error_report = sock_def_error_report; |
| 2113 | sk->sk_destruct = sock_def_destruct; |
| 2114 | |
| 2115 | sk->sk_sndmsg_page = NULL; |
| 2116 | sk->sk_sndmsg_off = 0; |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 2117 | sk->sk_peek_off = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 2119 | sk->sk_peer_pid = NULL; |
| 2120 | sk->sk_peer_cred = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | sk->sk_write_pending = 0; |
| 2122 | sk->sk_rcvlowat = 1; |
| 2123 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| 2124 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
| 2125 | |
Eric Dumazet | f37f0af | 2008-04-13 21:39:26 -0700 | [diff] [blame] | 2126 | sk->sk_stamp = ktime_set(-1L, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 2128 | /* |
| 2129 | * Before updating sk_refcnt, we must commit prior changes to memory |
| 2130 | * (Documentation/RCU/rculist_nulls.txt for details) |
| 2131 | */ |
| 2132 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | atomic_set(&sk->sk_refcnt, 1); |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 2134 | atomic_set(&sk->sk_drops, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2136 | EXPORT_SYMBOL(sock_init_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 2138 | void lock_sock_nested(struct sock *sk, int subclass) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | { |
| 2140 | might_sleep(); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2141 | spin_lock_bh(&sk->sk_lock.slock); |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 2142 | if (sk->sk_lock.owned) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | __lock_sock(sk); |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 2144 | sk->sk_lock.owned = 1; |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2145 | spin_unlock(&sk->sk_lock.slock); |
| 2146 | /* |
| 2147 | * The sk_lock has mutex_lock() semantics here: |
| 2148 | */ |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 2149 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2150 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | } |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 2152 | EXPORT_SYMBOL(lock_sock_nested); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 2154 | void release_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2156 | /* |
| 2157 | * The sk_lock has mutex_unlock() semantics: |
| 2158 | */ |
| 2159 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
| 2160 | |
| 2161 | spin_lock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | if (sk->sk_backlog.tail) |
| 2163 | __release_sock(sk); |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 2164 | sk->sk_lock.owned = 0; |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2165 | if (waitqueue_active(&sk->sk_lock.wq)) |
| 2166 | wake_up(&sk->sk_lock.wq); |
| 2167 | spin_unlock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | } |
| 2169 | EXPORT_SYMBOL(release_sock); |
| 2170 | |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 2171 | /** |
| 2172 | * lock_sock_fast - fast version of lock_sock |
| 2173 | * @sk: socket |
| 2174 | * |
| 2175 | * This version should be used for very small section, where process wont block |
| 2176 | * return false if fast path is taken |
| 2177 | * sk_lock.slock locked, owned = 0, BH disabled |
| 2178 | * return true if slow path is taken |
| 2179 | * sk_lock.slock unlocked, owned = 1, BH enabled |
| 2180 | */ |
| 2181 | bool lock_sock_fast(struct sock *sk) |
| 2182 | { |
| 2183 | might_sleep(); |
| 2184 | spin_lock_bh(&sk->sk_lock.slock); |
| 2185 | |
| 2186 | if (!sk->sk_lock.owned) |
| 2187 | /* |
| 2188 | * Note : We must disable BH |
| 2189 | */ |
| 2190 | return false; |
| 2191 | |
| 2192 | __lock_sock(sk); |
| 2193 | sk->sk_lock.owned = 1; |
| 2194 | spin_unlock(&sk->sk_lock.slock); |
| 2195 | /* |
| 2196 | * The sk_lock has mutex_lock() semantics here: |
| 2197 | */ |
| 2198 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); |
| 2199 | local_bh_enable(); |
| 2200 | return true; |
| 2201 | } |
| 2202 | EXPORT_SYMBOL(lock_sock_fast); |
| 2203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2205 | { |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2206 | struct timeval tv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2208 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2209 | tv = ktime_to_timeval(sk->sk_stamp); |
| 2210 | if (tv.tv_sec == -1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | return -ENOENT; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2212 | if (tv.tv_sec == 0) { |
| 2213 | sk->sk_stamp = ktime_get_real(); |
| 2214 | tv = ktime_to_timeval(sk->sk_stamp); |
| 2215 | } |
| 2216 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2217 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | EXPORT_SYMBOL(sock_get_timestamp); |
| 2219 | |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 2220 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
| 2221 | { |
| 2222 | struct timespec ts; |
| 2223 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2224 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 2225 | ts = ktime_to_timespec(sk->sk_stamp); |
| 2226 | if (ts.tv_sec == -1) |
| 2227 | return -ENOENT; |
| 2228 | if (ts.tv_sec == 0) { |
| 2229 | sk->sk_stamp = ktime_get_real(); |
| 2230 | ts = ktime_to_timespec(sk->sk_stamp); |
| 2231 | } |
| 2232 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; |
| 2233 | } |
| 2234 | EXPORT_SYMBOL(sock_get_timestampns); |
| 2235 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2236 | void sock_enable_timestamp(struct sock *sk, int flag) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2237 | { |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2238 | if (!sock_flag(sk, flag)) { |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 2239 | unsigned long previous_flags = sk->sk_flags; |
| 2240 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2241 | sock_set_flag(sk, flag); |
| 2242 | /* |
| 2243 | * we just set one of the two flags which require net |
| 2244 | * time stamping, but time stamping might have been on |
| 2245 | * already because of the other one |
| 2246 | */ |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 2247 | if (!(previous_flags & SK_FLAGS_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2248 | net_enable_timestamp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | } |
| 2250 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | |
| 2252 | /* |
| 2253 | * Get a socket option on an socket. |
| 2254 | * |
| 2255 | * FIX: POSIX 1003.1g is very ambiguous here. It states that |
| 2256 | * asynchronous errors should be reported by getsockopt. We assume |
| 2257 | * this means if you specify SO_ERROR (otherwise whats the point of it). |
| 2258 | */ |
| 2259 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 2260 | char __user *optval, int __user *optlen) |
| 2261 | { |
| 2262 | struct sock *sk = sock->sk; |
| 2263 | |
| 2264 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 2265 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | EXPORT_SYMBOL(sock_common_getsockopt); |
| 2267 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2268 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2269 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 2270 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2271 | { |
| 2272 | struct sock *sk = sock->sk; |
| 2273 | |
Johannes Berg | 1e51f95 | 2007-03-06 13:44:06 -0800 | [diff] [blame] | 2274 | if (sk->sk_prot->compat_getsockopt != NULL) |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2275 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
| 2276 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2277 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 2278 | } |
| 2279 | EXPORT_SYMBOL(compat_sock_common_getsockopt); |
| 2280 | #endif |
| 2281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 2283 | struct msghdr *msg, size_t size, int flags) |
| 2284 | { |
| 2285 | struct sock *sk = sock->sk; |
| 2286 | int addr_len = 0; |
| 2287 | int err; |
| 2288 | |
| 2289 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, |
| 2290 | flags & ~MSG_DONTWAIT, &addr_len); |
| 2291 | if (err >= 0) |
| 2292 | msg->msg_namelen = addr_len; |
| 2293 | return err; |
| 2294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | EXPORT_SYMBOL(sock_common_recvmsg); |
| 2296 | |
| 2297 | /* |
| 2298 | * Set socket options on an inet socket. |
| 2299 | */ |
| 2300 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2301 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | { |
| 2303 | struct sock *sk = sock->sk; |
| 2304 | |
| 2305 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 2306 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | EXPORT_SYMBOL(sock_common_setsockopt); |
| 2308 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2309 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2310 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2311 | char __user *optval, unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2312 | { |
| 2313 | struct sock *sk = sock->sk; |
| 2314 | |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2315 | if (sk->sk_prot->compat_setsockopt != NULL) |
| 2316 | return sk->sk_prot->compat_setsockopt(sk, level, optname, |
| 2317 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2318 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 2319 | } |
| 2320 | EXPORT_SYMBOL(compat_sock_common_setsockopt); |
| 2321 | #endif |
| 2322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | void sk_common_release(struct sock *sk) |
| 2324 | { |
| 2325 | if (sk->sk_prot->destroy) |
| 2326 | sk->sk_prot->destroy(sk); |
| 2327 | |
| 2328 | /* |
| 2329 | * Observation: when sock_common_release is called, processes have |
| 2330 | * no access to socket. But net still has. |
| 2331 | * Step one, detach it from networking: |
| 2332 | * |
| 2333 | * A. Remove from hash tables. |
| 2334 | */ |
| 2335 | |
| 2336 | sk->sk_prot->unhash(sk); |
| 2337 | |
| 2338 | /* |
| 2339 | * In this point socket cannot receive new packets, but it is possible |
| 2340 | * that some packets are in flight because some CPU runs receiver and |
| 2341 | * did hash table lookup before we unhashed socket. They will achieve |
| 2342 | * receive queue and will be purged by socket destructor. |
| 2343 | * |
| 2344 | * Also we still have packets pending on receive queue and probably, |
| 2345 | * our own packets waiting in device queues. sock_destroy will drain |
| 2346 | * receive queue, but transmitted packets will delay socket destruction |
| 2347 | * until the last reference will be released. |
| 2348 | */ |
| 2349 | |
| 2350 | sock_orphan(sk); |
| 2351 | |
| 2352 | xfrm_sk_free_policy(sk); |
| 2353 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 2354 | sk_refcnt_debug_release(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | sock_put(sk); |
| 2356 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2357 | EXPORT_SYMBOL(sk_common_release); |
| 2358 | |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2359 | #ifdef CONFIG_PROC_FS |
| 2360 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2361 | struct prot_inuse { |
| 2362 | int val[PROTO_INUSE_NR]; |
| 2363 | }; |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2364 | |
| 2365 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2366 | |
| 2367 | #ifdef CONFIG_NET_NS |
| 2368 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
| 2369 | { |
Eric Dumazet | d6d9ca0 | 2010-07-19 10:48:49 +0000 | [diff] [blame] | 2370 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2371 | } |
| 2372 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| 2373 | |
| 2374 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
| 2375 | { |
| 2376 | int cpu, idx = prot->inuse_idx; |
| 2377 | int res = 0; |
| 2378 | |
| 2379 | for_each_possible_cpu(cpu) |
| 2380 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; |
| 2381 | |
| 2382 | return res >= 0 ? res : 0; |
| 2383 | } |
| 2384 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
| 2385 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2386 | static int __net_init sock_inuse_init_net(struct net *net) |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2387 | { |
| 2388 | net->core.inuse = alloc_percpu(struct prot_inuse); |
| 2389 | return net->core.inuse ? 0 : -ENOMEM; |
| 2390 | } |
| 2391 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2392 | static void __net_exit sock_inuse_exit_net(struct net *net) |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2393 | { |
| 2394 | free_percpu(net->core.inuse); |
| 2395 | } |
| 2396 | |
| 2397 | static struct pernet_operations net_inuse_ops = { |
| 2398 | .init = sock_inuse_init_net, |
| 2399 | .exit = sock_inuse_exit_net, |
| 2400 | }; |
| 2401 | |
| 2402 | static __init int net_inuse_init(void) |
| 2403 | { |
| 2404 | if (register_pernet_subsys(&net_inuse_ops)) |
| 2405 | panic("Cannot initialize net inuse counters"); |
| 2406 | |
| 2407 | return 0; |
| 2408 | } |
| 2409 | |
| 2410 | core_initcall(net_inuse_init); |
| 2411 | #else |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2412 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
| 2413 | |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 2414 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2415 | { |
Eric Dumazet | d6d9ca0 | 2010-07-19 10:48:49 +0000 | [diff] [blame] | 2416 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2417 | } |
| 2418 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| 2419 | |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 2420 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2421 | { |
| 2422 | int cpu, idx = prot->inuse_idx; |
| 2423 | int res = 0; |
| 2424 | |
| 2425 | for_each_possible_cpu(cpu) |
| 2426 | res += per_cpu(prot_inuse, cpu).val[idx]; |
| 2427 | |
| 2428 | return res >= 0 ? res : 0; |
| 2429 | } |
| 2430 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2431 | #endif |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2432 | |
| 2433 | static void assign_proto_idx(struct proto *prot) |
| 2434 | { |
| 2435 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); |
| 2436 | |
| 2437 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { |
| 2438 | printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); |
| 2439 | return; |
| 2440 | } |
| 2441 | |
| 2442 | set_bit(prot->inuse_idx, proto_inuse_idx); |
| 2443 | } |
| 2444 | |
| 2445 | static void release_proto_idx(struct proto *prot) |
| 2446 | { |
| 2447 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) |
| 2448 | clear_bit(prot->inuse_idx, proto_inuse_idx); |
| 2449 | } |
| 2450 | #else |
| 2451 | static inline void assign_proto_idx(struct proto *prot) |
| 2452 | { |
| 2453 | } |
| 2454 | |
| 2455 | static inline void release_proto_idx(struct proto *prot) |
| 2456 | { |
| 2457 | } |
| 2458 | #endif |
| 2459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2460 | int proto_register(struct proto *prot, int alloc_slab) |
| 2461 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2462 | if (alloc_slab) { |
| 2463 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 2464 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
| 2465 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2466 | |
| 2467 | if (prot->slab == NULL) { |
| 2468 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", |
| 2469 | prot->name); |
Pavel Emelyanov | 60e7663 | 2008-03-28 16:39:10 -0700 | [diff] [blame] | 2470 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2471 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2472 | |
| 2473 | if (prot->rsk_prot != NULL) { |
Alexey Dobriyan | faf2342 | 2010-02-17 09:34:12 +0000 | [diff] [blame] | 2474 | prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2475 | if (prot->rsk_prot->slab_name == NULL) |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2476 | goto out_free_sock_slab; |
| 2477 | |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2478 | prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2479 | prot->rsk_prot->obj_size, 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2480 | SLAB_HWCACHE_ALIGN, NULL); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2481 | |
| 2482 | if (prot->rsk_prot->slab == NULL) { |
| 2483 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", |
| 2484 | prot->name); |
| 2485 | goto out_free_request_sock_slab_name; |
| 2486 | } |
| 2487 | } |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2488 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2489 | if (prot->twsk_prot != NULL) { |
Alexey Dobriyan | faf2342 | 2010-02-17 09:34:12 +0000 | [diff] [blame] | 2490 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2491 | |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2492 | if (prot->twsk_prot->twsk_slab_name == NULL) |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2493 | goto out_free_request_sock_slab; |
| 2494 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2495 | prot->twsk_prot->twsk_slab = |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2496 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2497 | prot->twsk_prot->twsk_obj_size, |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2498 | 0, |
| 2499 | SLAB_HWCACHE_ALIGN | |
| 2500 | prot->slab_flags, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2501 | NULL); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2502 | if (prot->twsk_prot->twsk_slab == NULL) |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2503 | goto out_free_timewait_sock_slab_name; |
| 2504 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2505 | } |
| 2506 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2507 | mutex_lock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2508 | list_add(&prot->node, &proto_list); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2509 | assign_proto_idx(prot); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2510 | mutex_unlock(&proto_list_mutex); |
Pavel Emelyanov | b733c00 | 2007-11-07 02:23:38 -0800 | [diff] [blame] | 2511 | return 0; |
| 2512 | |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2513 | out_free_timewait_sock_slab_name: |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2514 | kfree(prot->twsk_prot->twsk_slab_name); |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2515 | out_free_request_sock_slab: |
| 2516 | if (prot->rsk_prot && prot->rsk_prot->slab) { |
| 2517 | kmem_cache_destroy(prot->rsk_prot->slab); |
| 2518 | prot->rsk_prot->slab = NULL; |
| 2519 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2520 | out_free_request_sock_slab_name: |
Dan Carpenter | 72150e9 | 2010-03-06 01:04:45 +0000 | [diff] [blame] | 2521 | if (prot->rsk_prot) |
| 2522 | kfree(prot->rsk_prot->slab_name); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2523 | out_free_sock_slab: |
| 2524 | kmem_cache_destroy(prot->slab); |
| 2525 | prot->slab = NULL; |
Pavel Emelyanov | b733c00 | 2007-11-07 02:23:38 -0800 | [diff] [blame] | 2526 | out: |
| 2527 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2528 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2529 | EXPORT_SYMBOL(proto_register); |
| 2530 | |
| 2531 | void proto_unregister(struct proto *prot) |
| 2532 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2533 | mutex_lock(&proto_list_mutex); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2534 | release_proto_idx(prot); |
Patrick McHardy | 0a3f435 | 2005-09-06 19:47:50 -0700 | [diff] [blame] | 2535 | list_del(&prot->node); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2536 | mutex_unlock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2537 | |
| 2538 | if (prot->slab != NULL) { |
| 2539 | kmem_cache_destroy(prot->slab); |
| 2540 | prot->slab = NULL; |
| 2541 | } |
| 2542 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2543 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2544 | kmem_cache_destroy(prot->rsk_prot->slab); |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2545 | kfree(prot->rsk_prot->slab_name); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2546 | prot->rsk_prot->slab = NULL; |
| 2547 | } |
| 2548 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2549 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2550 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2551 | kfree(prot->twsk_prot->twsk_slab_name); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2552 | prot->twsk_prot->twsk_slab = NULL; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2553 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2555 | EXPORT_SYMBOL(proto_unregister); |
| 2556 | |
| 2557 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2558 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2559 | __acquires(proto_list_mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2560 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2561 | mutex_lock(&proto_list_mutex); |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2562 | return seq_list_start_head(&proto_list, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2563 | } |
| 2564 | |
| 2565 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2566 | { |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2567 | return seq_list_next(v, &proto_list, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2568 | } |
| 2569 | |
| 2570 | static void proto_seq_stop(struct seq_file *seq, void *v) |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2571 | __releases(proto_list_mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2572 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2573 | mutex_unlock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2574 | } |
| 2575 | |
| 2576 | static char proto_method_implemented(const void *method) |
| 2577 | { |
| 2578 | return method == NULL ? 'n' : 'y'; |
| 2579 | } |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2580 | static long sock_prot_memory_allocated(struct proto *proto) |
| 2581 | { |
| 2582 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto): -1L; |
| 2583 | } |
| 2584 | |
| 2585 | static char *sock_prot_memory_pressure(struct proto *proto) |
| 2586 | { |
| 2587 | return proto->memory_pressure != NULL ? |
| 2588 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; |
| 2589 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2590 | |
| 2591 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) |
| 2592 | { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2593 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 2594 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2595 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
| 2596 | proto->name, |
| 2597 | proto->obj_size, |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2598 | sock_prot_inuse_get(seq_file_net(seq), proto), |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2599 | sock_prot_memory_allocated(proto), |
| 2600 | sock_prot_memory_pressure(proto), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2601 | proto->max_header, |
| 2602 | proto->slab == NULL ? "no" : "yes", |
| 2603 | module_name(proto->owner), |
| 2604 | proto_method_implemented(proto->close), |
| 2605 | proto_method_implemented(proto->connect), |
| 2606 | proto_method_implemented(proto->disconnect), |
| 2607 | proto_method_implemented(proto->accept), |
| 2608 | proto_method_implemented(proto->ioctl), |
| 2609 | proto_method_implemented(proto->init), |
| 2610 | proto_method_implemented(proto->destroy), |
| 2611 | proto_method_implemented(proto->shutdown), |
| 2612 | proto_method_implemented(proto->setsockopt), |
| 2613 | proto_method_implemented(proto->getsockopt), |
| 2614 | proto_method_implemented(proto->sendmsg), |
| 2615 | proto_method_implemented(proto->recvmsg), |
| 2616 | proto_method_implemented(proto->sendpage), |
| 2617 | proto_method_implemented(proto->bind), |
| 2618 | proto_method_implemented(proto->backlog_rcv), |
| 2619 | proto_method_implemented(proto->hash), |
| 2620 | proto_method_implemented(proto->unhash), |
| 2621 | proto_method_implemented(proto->get_port), |
| 2622 | proto_method_implemented(proto->enter_memory_pressure)); |
| 2623 | } |
| 2624 | |
| 2625 | static int proto_seq_show(struct seq_file *seq, void *v) |
| 2626 | { |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2627 | if (v == &proto_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2628 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
| 2629 | "protocol", |
| 2630 | "size", |
| 2631 | "sockets", |
| 2632 | "memory", |
| 2633 | "press", |
| 2634 | "maxhdr", |
| 2635 | "slab", |
| 2636 | "module", |
| 2637 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); |
| 2638 | else |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2639 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2640 | return 0; |
| 2641 | } |
| 2642 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 2643 | static const struct seq_operations proto_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2644 | .start = proto_seq_start, |
| 2645 | .next = proto_seq_next, |
| 2646 | .stop = proto_seq_stop, |
| 2647 | .show = proto_seq_show, |
| 2648 | }; |
| 2649 | |
| 2650 | static int proto_seq_open(struct inode *inode, struct file *file) |
| 2651 | { |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2652 | return seq_open_net(inode, file, &proto_seq_ops, |
| 2653 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2654 | } |
| 2655 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 2656 | static const struct file_operations proto_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | .owner = THIS_MODULE, |
| 2658 | .open = proto_seq_open, |
| 2659 | .read = seq_read, |
| 2660 | .llseek = seq_lseek, |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2661 | .release = seq_release_net, |
| 2662 | }; |
| 2663 | |
| 2664 | static __net_init int proto_init_net(struct net *net) |
| 2665 | { |
| 2666 | if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) |
| 2667 | return -ENOMEM; |
| 2668 | |
| 2669 | return 0; |
| 2670 | } |
| 2671 | |
| 2672 | static __net_exit void proto_exit_net(struct net *net) |
| 2673 | { |
| 2674 | proc_net_remove(net, "protocols"); |
| 2675 | } |
| 2676 | |
| 2677 | |
| 2678 | static __net_initdata struct pernet_operations proto_net_ops = { |
| 2679 | .init = proto_init_net, |
| 2680 | .exit = proto_exit_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2681 | }; |
| 2682 | |
| 2683 | static int __init proto_init(void) |
| 2684 | { |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2685 | return register_pernet_subsys(&proto_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2686 | } |
| 2687 | |
| 2688 | subsys_initcall(proto_init); |
| 2689 | |
| 2690 | #endif /* PROC_FS */ |