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 | |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 92 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 93 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 94 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #include <linux/errno.h> |
| 96 | #include <linux/types.h> |
| 97 | #include <linux/socket.h> |
| 98 | #include <linux/in.h> |
| 99 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | #include <linux/module.h> |
| 101 | #include <linux/proc_fs.h> |
| 102 | #include <linux/seq_file.h> |
| 103 | #include <linux/sched.h> |
| 104 | #include <linux/timer.h> |
| 105 | #include <linux/string.h> |
| 106 | #include <linux/sockios.h> |
| 107 | #include <linux/net.h> |
| 108 | #include <linux/mm.h> |
| 109 | #include <linux/slab.h> |
| 110 | #include <linux/interrupt.h> |
| 111 | #include <linux/poll.h> |
| 112 | #include <linux/tcp.h> |
| 113 | #include <linux/init.h> |
Al Viro | a1f8e7f7 | 2006-10-19 16:08:53 -0400 | [diff] [blame] | 114 | #include <linux/highmem.h> |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 115 | #include <linux/user_namespace.h> |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 116 | #include <linux/static_key.h> |
David S. Miller | 3969eb3 | 2012-01-09 13:44:23 -0800 | [diff] [blame] | 117 | #include <linux/memcontrol.h> |
David S. Miller | 8c1ae10 | 2012-05-03 02:25:55 -0400 | [diff] [blame] | 118 | #include <linux/prefetch.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
| 122 | #include <linux/netdevice.h> |
| 123 | #include <net/protocol.h> |
| 124 | #include <linux/skbuff.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 125 | #include <net/net_namespace.h> |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 126 | #include <net/request_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | #include <net/sock.h> |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 128 | #include <linux/net_tstamp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | #include <net/xfrm.h> |
| 130 | #include <linux/ipsec.h> |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 131 | #include <net/cls_cgroup.h> |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 132 | #include <net/netprio_cgroup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
| 134 | #include <linux/filter.h> |
| 135 | |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 136 | #include <trace/events/sock.h> |
| 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | #ifdef CONFIG_INET |
| 139 | #include <net/tcp.h> |
| 140 | #endif |
| 141 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 142 | static DEFINE_MUTEX(proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 143 | static LIST_HEAD(proto_list); |
| 144 | |
Andrew Morton | c255a45 | 2012-07-31 16:43:02 -0700 | [diff] [blame] | 145 | #ifdef CONFIG_MEMCG_KMEM |
Glauber Costa | 1d62e43 | 2012-04-09 19:36:33 -0300 | [diff] [blame] | 146 | int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 147 | { |
| 148 | struct proto *proto; |
| 149 | int ret = 0; |
| 150 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 151 | mutex_lock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 152 | list_for_each_entry(proto, &proto_list, node) { |
| 153 | if (proto->init_cgroup) { |
Glauber Costa | 1d62e43 | 2012-04-09 19:36:33 -0300 | [diff] [blame] | 154 | ret = proto->init_cgroup(memcg, ss); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 155 | if (ret) |
| 156 | goto out; |
| 157 | } |
| 158 | } |
| 159 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 160 | mutex_unlock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 161 | return ret; |
| 162 | out: |
| 163 | list_for_each_entry_continue_reverse(proto, &proto_list, node) |
| 164 | if (proto->destroy_cgroup) |
Glauber Costa | 1d62e43 | 2012-04-09 19:36:33 -0300 | [diff] [blame] | 165 | proto->destroy_cgroup(memcg); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 166 | mutex_unlock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 167 | return ret; |
| 168 | } |
| 169 | |
Glauber Costa | 1d62e43 | 2012-04-09 19:36:33 -0300 | [diff] [blame] | 170 | void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 171 | { |
| 172 | struct proto *proto; |
| 173 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 174 | mutex_lock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 175 | list_for_each_entry_reverse(proto, &proto_list, node) |
| 176 | if (proto->destroy_cgroup) |
Glauber Costa | 1d62e43 | 2012-04-09 19:36:33 -0300 | [diff] [blame] | 177 | proto->destroy_cgroup(memcg); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 178 | mutex_unlock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 179 | } |
| 180 | #endif |
| 181 | |
Ingo Molnar | da21f24 | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 182 | /* |
| 183 | * Each address family might have different locking rules, so we have |
| 184 | * one slock key per address family: |
| 185 | */ |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 186 | static struct lock_class_key af_family_keys[AF_MAX]; |
| 187 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
| 188 | |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 189 | struct static_key memcg_socket_limit_enabled; |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 190 | EXPORT_SYMBOL(memcg_socket_limit_enabled); |
| 191 | |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 192 | /* |
| 193 | * Make lock validator output more readable. (we pre-construct these |
| 194 | * strings build-time, so that runtime initialization of socket |
| 195 | * locks is fast): |
| 196 | */ |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 197 | static const char *const af_family_key_strings[AF_MAX+1] = { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 198 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
| 199 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", |
| 200 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , |
| 201 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , |
| 202 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , |
| 203 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , |
| 204 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 205 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 206 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
Oliver Hartkopp | cd05acf | 2007-12-16 15:59:24 -0800 | [diff] [blame] | 207 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 208 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 209 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 210 | "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] | 211 | "sk_lock-AF_NFC" , "sk_lock-AF_MAX" |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 212 | }; |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 213 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 214 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
| 215 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", |
| 216 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , |
| 217 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , |
| 218 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , |
| 219 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , |
| 220 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 221 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 222 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
Oliver Hartkopp | cd05acf | 2007-12-16 15:59:24 -0800 | [diff] [blame] | 223 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 224 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 225 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 226 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
Aloisio Almeida Jr | c7fe3b5 | 2011-07-01 19:31:35 -0300 | [diff] [blame] | 227 | "slock-AF_NFC" , "slock-AF_MAX" |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 228 | }; |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 229 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 230 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
| 231 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", |
| 232 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , |
| 233 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , |
| 234 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , |
| 235 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , |
| 236 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 237 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 238 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
Oliver Hartkopp | b4942af | 2008-07-23 14:06:04 -0700 | [diff] [blame] | 239 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
David Howells | e51f802 | 2007-07-21 19:30:16 -0700 | [diff] [blame] | 240 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 241 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 242 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
Aloisio Almeida Jr | c7fe3b5 | 2011-07-01 19:31:35 -0300 | [diff] [blame] | 243 | "clock-AF_NFC" , "clock-AF_MAX" |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 244 | }; |
Ingo Molnar | da21f24 | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 245 | |
| 246 | /* |
| 247 | * sk_callback_lock locking rules are per-address-family, |
| 248 | * so split the lock classes by using a per-AF key: |
| 249 | */ |
| 250 | static struct lock_class_key af_callback_keys[AF_MAX]; |
| 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | /* Take into consideration the size of the struct sk_buff overhead in the |
| 253 | * determination of these values, since that is non-constant across |
| 254 | * platforms. This makes socket queueing behavior and performance |
| 255 | * not depend upon such differences. |
| 256 | */ |
| 257 | #define _SK_MEM_PACKETS 256 |
Eric Dumazet | 87fb4b7 | 2011-10-13 07:28:54 +0000 | [diff] [blame] | 258 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 260 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 261 | |
| 262 | /* Run time adjustable parameters. */ |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 263 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
Hans Schillstrom | 6d8ebc8 | 2012-04-30 08:13:50 +0200 | [diff] [blame] | 264 | EXPORT_SYMBOL(sysctl_wmem_max); |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 265 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
Hans Schillstrom | 6d8ebc8 | 2012-04-30 08:13:50 +0200 | [diff] [blame] | 266 | EXPORT_SYMBOL(sysctl_rmem_max); |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 267 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
| 268 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 270 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 271 | 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] | 272 | EXPORT_SYMBOL(sysctl_optmem_max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | |
Mel Gorman | c93bdd0 | 2012-07-31 16:44:19 -0700 | [diff] [blame] | 274 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
| 275 | EXPORT_SYMBOL_GPL(memalloc_socks); |
| 276 | |
Mel Gorman | 7cb0240 | 2012-07-31 16:44:16 -0700 | [diff] [blame] | 277 | /** |
| 278 | * sk_set_memalloc - sets %SOCK_MEMALLOC |
| 279 | * @sk: socket to set it on |
| 280 | * |
| 281 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. |
| 282 | * It's the responsibility of the admin to adjust min_free_kbytes |
| 283 | * to meet the requirements |
| 284 | */ |
| 285 | void sk_set_memalloc(struct sock *sk) |
| 286 | { |
| 287 | sock_set_flag(sk, SOCK_MEMALLOC); |
| 288 | sk->sk_allocation |= __GFP_MEMALLOC; |
Mel Gorman | c93bdd0 | 2012-07-31 16:44:19 -0700 | [diff] [blame] | 289 | static_key_slow_inc(&memalloc_socks); |
Mel Gorman | 7cb0240 | 2012-07-31 16:44:16 -0700 | [diff] [blame] | 290 | } |
| 291 | EXPORT_SYMBOL_GPL(sk_set_memalloc); |
| 292 | |
| 293 | void sk_clear_memalloc(struct sock *sk) |
| 294 | { |
| 295 | sock_reset_flag(sk, SOCK_MEMALLOC); |
| 296 | sk->sk_allocation &= ~__GFP_MEMALLOC; |
Mel Gorman | c93bdd0 | 2012-07-31 16:44:19 -0700 | [diff] [blame] | 297 | static_key_slow_dec(&memalloc_socks); |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 298 | |
| 299 | /* |
| 300 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward |
| 301 | * progress of swapping. However, if SOCK_MEMALLOC is cleared while |
| 302 | * it has rmem allocations there is a risk that the user of the |
| 303 | * socket cannot make forward progress due to exceeding the rmem |
| 304 | * limits. By rights, sk_clear_memalloc() should only be called |
| 305 | * on sockets being torn down but warn and reset the accounting if |
| 306 | * that assumption breaks. |
| 307 | */ |
| 308 | if (WARN_ON(sk->sk_forward_alloc)) |
| 309 | sk_mem_reclaim(sk); |
Mel Gorman | 7cb0240 | 2012-07-31 16:44:16 -0700 | [diff] [blame] | 310 | } |
| 311 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); |
| 312 | |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 313 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
| 314 | { |
| 315 | int ret; |
| 316 | unsigned long pflags = current->flags; |
| 317 | |
| 318 | /* these should have been dropped before queueing */ |
| 319 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); |
| 320 | |
| 321 | current->flags |= PF_MEMALLOC; |
| 322 | ret = sk->sk_backlog_rcv(sk, skb); |
| 323 | tsk_restore_flags(current, pflags, PF_MEMALLOC); |
| 324 | |
| 325 | return ret; |
| 326 | } |
| 327 | EXPORT_SYMBOL(__sk_backlog_rcv); |
| 328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
| 330 | { |
| 331 | struct timeval tv; |
| 332 | |
| 333 | if (optlen < sizeof(tv)) |
| 334 | return -EINVAL; |
| 335 | if (copy_from_user(&tv, optval, sizeof(tv))) |
| 336 | return -EFAULT; |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 337 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
| 338 | return -EDOM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 340 | if (tv.tv_sec < 0) { |
Andrew Morton | 6f11df8 | 2007-07-09 13:16:00 -0700 | [diff] [blame] | 341 | static int warned __read_mostly; |
| 342 | |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 343 | *timeo_p = 0; |
Ilpo Järvinen | 50aab54 | 2008-05-02 16:20:10 -0700 | [diff] [blame] | 344 | if (warned < 10 && net_ratelimit()) { |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 345 | warned++; |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 346 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
| 347 | __func__, current->comm, task_pid_nr(current)); |
Ilpo Järvinen | 50aab54 | 2008-05-02 16:20:10 -0700 | [diff] [blame] | 348 | } |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 349 | return 0; |
| 350 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
| 352 | if (tv.tv_sec == 0 && tv.tv_usec == 0) |
| 353 | return 0; |
| 354 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) |
| 355 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | static void sock_warn_obsolete_bsdism(const char *name) |
| 360 | { |
| 361 | static int warned; |
| 362 | static char warncomm[TASK_COMM_LEN]; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 363 | if (strcmp(warncomm, current->comm) && warned < 5) { |
| 364 | strcpy(warncomm, current->comm); |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 365 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
| 366 | warncomm, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | warned++; |
| 368 | } |
| 369 | } |
| 370 | |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 371 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
| 372 | |
| 373 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 374 | { |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 375 | if (sk->sk_flags & flags) { |
| 376 | sk->sk_flags &= ~flags; |
| 377 | if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 378 | net_disable_timestamp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | } |
| 380 | } |
| 381 | |
| 382 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 383 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 384 | { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 385 | int err; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 386 | int skb_len; |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 387 | unsigned long flags; |
| 388 | struct sk_buff_head *list = &sk->sk_receive_queue; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 389 | |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 390 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 391 | atomic_inc(&sk->sk_drops); |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 392 | trace_sock_rcvqueue_full(sk, skb); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 393 | return -ENOMEM; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 394 | } |
| 395 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 396 | err = sk_filter(sk, skb); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 397 | if (err) |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 398 | return err; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 399 | |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 400 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 401 | atomic_inc(&sk->sk_drops); |
| 402 | return -ENOBUFS; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 403 | } |
| 404 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 405 | skb->dev = NULL; |
| 406 | skb_set_owner_r(skb, sk); |
David S. Miller | 49ad959 | 2008-12-17 22:11:38 -0800 | [diff] [blame] | 407 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 408 | /* Cache the SKB length before we tack it onto the receive |
| 409 | * queue. Once it is added it no longer belongs to us and |
| 410 | * may be freed by other threads of control pulling packets |
| 411 | * from the queue. |
| 412 | */ |
| 413 | skb_len = skb->len; |
| 414 | |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 415 | /* we escape from rcu protected region, make sure we dont leak |
| 416 | * a norefcounted dst |
| 417 | */ |
| 418 | skb_dst_force(skb); |
| 419 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 420 | spin_lock_irqsave(&list->lock, flags); |
| 421 | skb->dropcount = atomic_read(&sk->sk_drops); |
| 422 | __skb_queue_tail(list, skb); |
| 423 | spin_unlock_irqrestore(&list->lock, flags); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 424 | |
| 425 | if (!sock_flag(sk, SOCK_DEAD)) |
| 426 | sk->sk_data_ready(sk, skb_len); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 427 | return 0; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 428 | } |
| 429 | EXPORT_SYMBOL(sock_queue_rcv_skb); |
| 430 | |
Arnaldo Carvalho de Melo | 58a5a7b | 2006-11-16 14:06:06 -0200 | [diff] [blame] | 431 | 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] | 432 | { |
| 433 | int rc = NET_RX_SUCCESS; |
| 434 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 435 | if (sk_filter(sk, skb)) |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 436 | goto discard_and_relse; |
| 437 | |
| 438 | skb->dev = NULL; |
| 439 | |
Eric Dumazet | f545a38 | 2012-04-22 23:34:26 +0000 | [diff] [blame] | 440 | if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) { |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 441 | atomic_inc(&sk->sk_drops); |
| 442 | goto discard_and_relse; |
| 443 | } |
Arnaldo Carvalho de Melo | 58a5a7b | 2006-11-16 14:06:06 -0200 | [diff] [blame] | 444 | if (nested) |
| 445 | bh_lock_sock_nested(sk); |
| 446 | else |
| 447 | bh_lock_sock(sk); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 448 | if (!sock_owned_by_user(sk)) { |
| 449 | /* |
| 450 | * trylock + unlock semantics: |
| 451 | */ |
| 452 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); |
| 453 | |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 454 | rc = sk_backlog_rcv(sk, skb); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 455 | |
| 456 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
Eric Dumazet | f545a38 | 2012-04-22 23:34:26 +0000 | [diff] [blame] | 457 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 458 | bh_unlock_sock(sk); |
| 459 | atomic_inc(&sk->sk_drops); |
| 460 | goto discard_and_relse; |
| 461 | } |
| 462 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 463 | bh_unlock_sock(sk); |
| 464 | out: |
| 465 | sock_put(sk); |
| 466 | return rc; |
| 467 | discard_and_relse: |
| 468 | kfree_skb(skb); |
| 469 | goto out; |
| 470 | } |
| 471 | EXPORT_SYMBOL(sk_receive_skb); |
| 472 | |
Krishna Kumar | ea94ff3 | 2009-10-19 23:46:45 +0000 | [diff] [blame] | 473 | void sk_reset_txq(struct sock *sk) |
| 474 | { |
| 475 | sk_tx_queue_clear(sk); |
| 476 | } |
| 477 | EXPORT_SYMBOL(sk_reset_txq); |
| 478 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 479 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
| 480 | { |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 481 | struct dst_entry *dst = __sk_dst_get(sk); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 482 | |
| 483 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 484 | sk_tx_queue_clear(sk); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 485 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 486 | dst_release(dst); |
| 487 | return NULL; |
| 488 | } |
| 489 | |
| 490 | return dst; |
| 491 | } |
| 492 | EXPORT_SYMBOL(__sk_dst_check); |
| 493 | |
| 494 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) |
| 495 | { |
| 496 | struct dst_entry *dst = sk_dst_get(sk); |
| 497 | |
| 498 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
| 499 | sk_dst_reset(sk); |
| 500 | dst_release(dst); |
| 501 | return NULL; |
| 502 | } |
| 503 | |
| 504 | return dst; |
| 505 | } |
| 506 | EXPORT_SYMBOL(sk_dst_check); |
| 507 | |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 508 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
| 509 | int optlen) |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 510 | { |
| 511 | int ret = -ENOPROTOOPT; |
| 512 | #ifdef CONFIG_NETDEVICES |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 513 | struct net *net = sock_net(sk); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 514 | char devname[IFNAMSIZ]; |
| 515 | int index; |
| 516 | |
| 517 | /* Sorry... */ |
| 518 | ret = -EPERM; |
Eric W. Biederman | 5e1fccc | 2012-11-16 03:03:04 +0000 | [diff] [blame] | 519 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 520 | goto out; |
| 521 | |
| 522 | ret = -EINVAL; |
| 523 | if (optlen < 0) |
| 524 | goto out; |
| 525 | |
| 526 | /* Bind this socket to a particular device like "eth0", |
| 527 | * as specified in the passed interface name. If the |
| 528 | * name is "" or the option length is zero the socket |
| 529 | * is not bound. |
| 530 | */ |
| 531 | if (optlen > IFNAMSIZ - 1) |
| 532 | optlen = IFNAMSIZ - 1; |
| 533 | memset(devname, 0, sizeof(devname)); |
| 534 | |
| 535 | ret = -EFAULT; |
| 536 | if (copy_from_user(devname, optval, optlen)) |
| 537 | goto out; |
| 538 | |
David S. Miller | 000ba2e | 2009-11-05 22:37:11 -0800 | [diff] [blame] | 539 | index = 0; |
| 540 | if (devname[0] != '\0') { |
Eric Dumazet | bf8e56b | 2009-11-05 21:03:39 -0800 | [diff] [blame] | 541 | struct net_device *dev; |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 542 | |
Eric Dumazet | bf8e56b | 2009-11-05 21:03:39 -0800 | [diff] [blame] | 543 | rcu_read_lock(); |
| 544 | dev = dev_get_by_name_rcu(net, devname); |
| 545 | if (dev) |
| 546 | index = dev->ifindex; |
| 547 | rcu_read_unlock(); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 548 | ret = -ENODEV; |
| 549 | if (!dev) |
| 550 | goto out; |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | lock_sock(sk); |
| 554 | sk->sk_bound_dev_if = index; |
| 555 | sk_dst_reset(sk); |
| 556 | release_sock(sk); |
| 557 | |
| 558 | ret = 0; |
| 559 | |
| 560 | out: |
| 561 | #endif |
| 562 | |
| 563 | return ret; |
| 564 | } |
| 565 | |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 566 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
| 567 | int __user *optlen, int len) |
| 568 | { |
| 569 | int ret = -ENOPROTOOPT; |
| 570 | #ifdef CONFIG_NETDEVICES |
| 571 | struct net *net = sock_net(sk); |
| 572 | struct net_device *dev; |
| 573 | char devname[IFNAMSIZ]; |
| 574 | unsigned seq; |
| 575 | |
| 576 | if (sk->sk_bound_dev_if == 0) { |
| 577 | len = 0; |
| 578 | goto zero; |
| 579 | } |
| 580 | |
| 581 | ret = -EINVAL; |
| 582 | if (len < IFNAMSIZ) |
| 583 | goto out; |
| 584 | |
| 585 | retry: |
Eric Dumazet | 30e6c9f | 2012-12-20 17:25:08 +0000 | [diff] [blame] | 586 | seq = read_seqcount_begin(&devnet_rename_seq); |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 587 | rcu_read_lock(); |
| 588 | dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); |
| 589 | ret = -ENODEV; |
| 590 | if (!dev) { |
| 591 | rcu_read_unlock(); |
| 592 | goto out; |
| 593 | } |
| 594 | |
| 595 | strcpy(devname, dev->name); |
| 596 | rcu_read_unlock(); |
Eric Dumazet | 30e6c9f | 2012-12-20 17:25:08 +0000 | [diff] [blame] | 597 | if (read_seqcount_retry(&devnet_rename_seq, seq)) |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 598 | goto retry; |
| 599 | |
| 600 | len = strlen(devname) + 1; |
| 601 | |
| 602 | ret = -EFAULT; |
| 603 | if (copy_to_user(optval, devname, len)) |
| 604 | goto out; |
| 605 | |
| 606 | zero: |
| 607 | ret = -EFAULT; |
| 608 | if (put_user(len, optlen)) |
| 609 | goto out; |
| 610 | |
| 611 | ret = 0; |
| 612 | |
| 613 | out: |
| 614 | #endif |
| 615 | |
| 616 | return ret; |
| 617 | } |
| 618 | |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 619 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
| 620 | { |
| 621 | if (valbool) |
| 622 | sock_set_flag(sk, bit); |
| 623 | else |
| 624 | sock_reset_flag(sk, bit); |
| 625 | } |
| 626 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | /* |
| 628 | * This is meant for all protocols to use and covers goings on |
| 629 | * at the socket level. Everything here is generic. |
| 630 | */ |
| 631 | |
| 632 | int sock_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 633 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | { |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 635 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | int val; |
| 637 | int valbool; |
| 638 | struct linger ling; |
| 639 | int ret = 0; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 640 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | /* |
| 642 | * Options without arguments |
| 643 | */ |
| 644 | |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 645 | if (optname == SO_BINDTODEVICE) |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 646 | return sock_setbindtodevice(sk, optval, optlen); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 647 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 648 | if (optlen < sizeof(int)) |
| 649 | return -EINVAL; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | if (get_user(val, (int __user *)optval)) |
| 652 | return -EFAULT; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 653 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 654 | valbool = val ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
| 656 | lock_sock(sk); |
| 657 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 658 | switch (optname) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 659 | case SO_DEBUG: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 660 | if (val && !capable(CAP_NET_ADMIN)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 661 | ret = -EACCES; |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 662 | else |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 663 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 664 | break; |
| 665 | case SO_REUSEADDR: |
Pavel Emelyanov | 4a17fd5 | 2012-04-19 03:39:36 +0000 | [diff] [blame] | 666 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 667 | break; |
| 668 | case SO_TYPE: |
Jan Engelhardt | 49c794e | 2009-08-04 07:28:28 +0000 | [diff] [blame] | 669 | case SO_PROTOCOL: |
Jan Engelhardt | 0d6038e | 2009-08-04 07:28:29 +0000 | [diff] [blame] | 670 | case SO_DOMAIN: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 671 | case SO_ERROR: |
| 672 | ret = -ENOPROTOOPT; |
| 673 | break; |
| 674 | case SO_DONTROUTE: |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 675 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 676 | break; |
| 677 | case SO_BROADCAST: |
| 678 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); |
| 679 | break; |
| 680 | case SO_SNDBUF: |
| 681 | /* Don't error on this BSD doesn't and if you think |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 682 | * about it this is right. Otherwise apps have to |
| 683 | * play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 684 | * are treated in BSD as hints |
| 685 | */ |
| 686 | val = min_t(u32, val, sysctl_wmem_max); |
Patrick McHardy | b0573de | 2005-08-09 19:30:51 -0700 | [diff] [blame] | 687 | set_sndbuf: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 688 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 689 | sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); |
| 690 | /* Wake up sending tasks if we upped the value. */ |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 691 | sk->sk_write_space(sk); |
| 692 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 694 | case SO_SNDBUFFORCE: |
| 695 | if (!capable(CAP_NET_ADMIN)) { |
| 696 | ret = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | break; |
| 698 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 699 | goto set_sndbuf; |
| 700 | |
| 701 | case SO_RCVBUF: |
| 702 | /* Don't error on this BSD doesn't and if you think |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 703 | * about it this is right. Otherwise apps have to |
| 704 | * play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 705 | * are treated in BSD as hints |
| 706 | */ |
| 707 | val = min_t(u32, val, sysctl_rmem_max); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 708 | set_rcvbuf: |
| 709 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| 710 | /* |
| 711 | * We double it on the way in to account for |
| 712 | * "struct sk_buff" etc. overhead. Applications |
| 713 | * assume that the SO_RCVBUF setting they make will |
| 714 | * allow that much actual data to be received on that |
| 715 | * socket. |
| 716 | * |
| 717 | * Applications are unaware that "struct sk_buff" and |
| 718 | * other overheads allocate from the receive buffer |
| 719 | * during socket buffer allocation. |
| 720 | * |
| 721 | * And after considering the possible alternatives, |
| 722 | * returning the value we actually used in getsockopt |
| 723 | * is the most desirable behavior. |
| 724 | */ |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 725 | sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 726 | break; |
| 727 | |
| 728 | case SO_RCVBUFFORCE: |
| 729 | if (!capable(CAP_NET_ADMIN)) { |
| 730 | ret = -EPERM; |
| 731 | break; |
| 732 | } |
| 733 | goto set_rcvbuf; |
| 734 | |
| 735 | case SO_KEEPALIVE: |
| 736 | #ifdef CONFIG_INET |
Eric Dumazet | 3e10986 | 2012-09-24 07:00:11 +0000 | [diff] [blame] | 737 | if (sk->sk_protocol == IPPROTO_TCP && |
| 738 | sk->sk_type == SOCK_STREAM) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 739 | tcp_set_keepalive(sk, valbool); |
| 740 | #endif |
| 741 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
| 742 | break; |
| 743 | |
| 744 | case SO_OOBINLINE: |
| 745 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); |
| 746 | break; |
| 747 | |
| 748 | case SO_NO_CHECK: |
| 749 | sk->sk_no_check = valbool; |
| 750 | break; |
| 751 | |
| 752 | case SO_PRIORITY: |
Eric W. Biederman | 5e1fccc | 2012-11-16 03:03:04 +0000 | [diff] [blame] | 753 | if ((val >= 0 && val <= 6) || |
| 754 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 755 | sk->sk_priority = val; |
| 756 | else |
| 757 | ret = -EPERM; |
| 758 | break; |
| 759 | |
| 760 | case SO_LINGER: |
| 761 | if (optlen < sizeof(ling)) { |
| 762 | ret = -EINVAL; /* 1003.1g */ |
| 763 | break; |
| 764 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 765 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 766 | ret = -EFAULT; |
| 767 | break; |
| 768 | } |
| 769 | if (!ling.l_onoff) |
| 770 | sock_reset_flag(sk, SOCK_LINGER); |
| 771 | else { |
| 772 | #if (BITS_PER_LONG == 32) |
| 773 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
| 774 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; |
| 775 | else |
| 776 | #endif |
| 777 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; |
| 778 | sock_set_flag(sk, SOCK_LINGER); |
| 779 | } |
| 780 | break; |
| 781 | |
| 782 | case SO_BSDCOMPAT: |
| 783 | sock_warn_obsolete_bsdism("setsockopt"); |
| 784 | break; |
| 785 | |
| 786 | case SO_PASSCRED: |
| 787 | if (valbool) |
| 788 | set_bit(SOCK_PASSCRED, &sock->flags); |
| 789 | else |
| 790 | clear_bit(SOCK_PASSCRED, &sock->flags); |
| 791 | break; |
| 792 | |
| 793 | case SO_TIMESTAMP: |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 794 | case SO_TIMESTAMPNS: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 795 | if (valbool) { |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 796 | if (optname == SO_TIMESTAMP) |
| 797 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| 798 | else |
| 799 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 800 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 801 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 802 | } else { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 803 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 804 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| 805 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 806 | break; |
| 807 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 808 | case SO_TIMESTAMPING: |
| 809 | if (val & ~SOF_TIMESTAMPING_MASK) { |
Rémi Denis-Courmont | f249fb7 | 2009-07-20 00:47:04 +0000 | [diff] [blame] | 810 | ret = -EINVAL; |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 811 | break; |
| 812 | } |
| 813 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, |
| 814 | val & SOF_TIMESTAMPING_TX_HARDWARE); |
| 815 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, |
| 816 | val & SOF_TIMESTAMPING_TX_SOFTWARE); |
| 817 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, |
| 818 | val & SOF_TIMESTAMPING_RX_HARDWARE); |
| 819 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
| 820 | sock_enable_timestamp(sk, |
| 821 | SOCK_TIMESTAMPING_RX_SOFTWARE); |
| 822 | else |
| 823 | sock_disable_timestamp(sk, |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 824 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 825 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, |
| 826 | val & SOF_TIMESTAMPING_SOFTWARE); |
| 827 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, |
| 828 | val & SOF_TIMESTAMPING_SYS_HARDWARE); |
| 829 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, |
| 830 | val & SOF_TIMESTAMPING_RAW_HARDWARE); |
| 831 | break; |
| 832 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 833 | case SO_RCVLOWAT: |
| 834 | if (val < 0) |
| 835 | val = INT_MAX; |
| 836 | sk->sk_rcvlowat = val ? : 1; |
| 837 | break; |
| 838 | |
| 839 | case SO_RCVTIMEO: |
| 840 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); |
| 841 | break; |
| 842 | |
| 843 | case SO_SNDTIMEO: |
| 844 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); |
| 845 | break; |
| 846 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 847 | case SO_ATTACH_FILTER: |
| 848 | ret = -EINVAL; |
| 849 | if (optlen == sizeof(struct sock_fprog)) { |
| 850 | struct sock_fprog fprog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 852 | ret = -EFAULT; |
| 853 | if (copy_from_user(&fprog, optval, sizeof(fprog))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 856 | ret = sk_attach_filter(&fprog, sk); |
| 857 | } |
| 858 | break; |
| 859 | |
| 860 | case SO_DETACH_FILTER: |
Pavel Emelyanov | 55b3332 | 2007-10-17 21:21:26 -0700 | [diff] [blame] | 861 | ret = sk_detach_filter(sk); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 862 | break; |
| 863 | |
| 864 | case SO_PASSSEC: |
| 865 | if (valbool) |
| 866 | set_bit(SOCK_PASSSEC, &sock->flags); |
| 867 | else |
| 868 | clear_bit(SOCK_PASSSEC, &sock->flags); |
| 869 | break; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 870 | case SO_MARK: |
Eric W. Biederman | 5e1fccc | 2012-11-16 03:03:04 +0000 | [diff] [blame] | 871 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 872 | ret = -EPERM; |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 873 | else |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 874 | sk->sk_mark = val; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 875 | break; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 876 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | /* We implement the SO_SNDLOWAT etc to |
| 878 | not be settable (1003.1g 5.3) */ |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 879 | case SO_RXQ_OVFL: |
Johannes Berg | 8083f0f | 2011-10-07 03:30:20 +0000 | [diff] [blame] | 880 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 881 | break; |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 882 | |
| 883 | case SO_WIFI_STATUS: |
| 884 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); |
| 885 | break; |
| 886 | |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 887 | case SO_PEEK_OFF: |
| 888 | if (sock->ops->set_peek_off) |
| 889 | sock->ops->set_peek_off(sk, val); |
| 890 | else |
| 891 | ret = -EOPNOTSUPP; |
| 892 | break; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 893 | |
| 894 | case SO_NOFCS: |
| 895 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); |
| 896 | break; |
| 897 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 898 | default: |
| 899 | ret = -ENOPROTOOPT; |
| 900 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 901 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | release_sock(sk); |
| 903 | return ret; |
| 904 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 905 | EXPORT_SYMBOL(sock_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | |
| 907 | |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 908 | void cred_to_ucred(struct pid *pid, const struct cred *cred, |
| 909 | struct ucred *ucred) |
| 910 | { |
| 911 | ucred->pid = pid_vnr(pid); |
| 912 | ucred->uid = ucred->gid = -1; |
| 913 | if (cred) { |
| 914 | struct user_namespace *current_ns = current_user_ns(); |
| 915 | |
Eric W. Biederman | b2e4f54 | 2012-05-23 16:39:45 -0600 | [diff] [blame] | 916 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
| 917 | ucred->gid = from_kgid_munged(current_ns, cred->egid); |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 918 | } |
| 919 | } |
David S. Miller | 3924773 | 2010-06-16 16:18:25 -0700 | [diff] [blame] | 920 | EXPORT_SYMBOL_GPL(cred_to_ucred); |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 921 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | int sock_getsockopt(struct socket *sock, int level, int optname, |
| 923 | char __user *optval, int __user *optlen) |
| 924 | { |
| 925 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 926 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 927 | union { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 928 | int val; |
| 929 | struct linger ling; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | struct timeval tm; |
| 931 | } v; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 932 | |
H Hartley Sweeten | 4d0392b | 2010-01-15 01:08:58 -0800 | [diff] [blame] | 933 | int lv = sizeof(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | int len; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 935 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 936 | if (get_user(len, optlen)) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 937 | return -EFAULT; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 938 | if (len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | return -EINVAL; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 940 | |
Eugene Teo | 50fee1d | 2009-02-23 15:38:41 -0800 | [diff] [blame] | 941 | memset(&v, 0, sizeof(v)); |
Clément Lecigne | df0bca0 | 2009-02-12 16:59:09 -0800 | [diff] [blame] | 942 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 943 | switch (optname) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 944 | case SO_DEBUG: |
| 945 | v.val = sock_flag(sk, SOCK_DBG); |
| 946 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 947 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 948 | case SO_DONTROUTE: |
| 949 | v.val = sock_flag(sk, SOCK_LOCALROUTE); |
| 950 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 951 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 952 | case SO_BROADCAST: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 953 | v.val = sock_flag(sk, SOCK_BROADCAST); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 954 | break; |
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 | case SO_SNDBUF: |
| 957 | v.val = sk->sk_sndbuf; |
| 958 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 959 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 960 | case SO_RCVBUF: |
| 961 | v.val = sk->sk_rcvbuf; |
| 962 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 964 | case SO_REUSEADDR: |
| 965 | v.val = sk->sk_reuse; |
| 966 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 968 | case SO_KEEPALIVE: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 969 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 970 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 972 | case SO_TYPE: |
| 973 | v.val = sk->sk_type; |
| 974 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | |
Jan Engelhardt | 49c794e | 2009-08-04 07:28:28 +0000 | [diff] [blame] | 976 | case SO_PROTOCOL: |
| 977 | v.val = sk->sk_protocol; |
| 978 | break; |
| 979 | |
Jan Engelhardt | 0d6038e | 2009-08-04 07:28:29 +0000 | [diff] [blame] | 980 | case SO_DOMAIN: |
| 981 | v.val = sk->sk_family; |
| 982 | break; |
| 983 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 984 | case SO_ERROR: |
| 985 | v.val = -sock_error(sk); |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 986 | if (v.val == 0) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 987 | v.val = xchg(&sk->sk_err_soft, 0); |
| 988 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 990 | case SO_OOBINLINE: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 991 | v.val = sock_flag(sk, SOCK_URGINLINE); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 992 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 993 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 994 | case SO_NO_CHECK: |
| 995 | v.val = sk->sk_no_check; |
| 996 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 998 | case SO_PRIORITY: |
| 999 | v.val = sk->sk_priority; |
| 1000 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1001 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1002 | case SO_LINGER: |
| 1003 | lv = sizeof(v.ling); |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1004 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1005 | v.ling.l_linger = sk->sk_lingertime / HZ; |
| 1006 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1007 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1008 | case SO_BSDCOMPAT: |
| 1009 | sock_warn_obsolete_bsdism("getsockopt"); |
| 1010 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1012 | case SO_TIMESTAMP: |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 1013 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
| 1014 | !sock_flag(sk, SOCK_RCVTSTAMPNS); |
| 1015 | break; |
| 1016 | |
| 1017 | case SO_TIMESTAMPNS: |
| 1018 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1019 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1021 | case SO_TIMESTAMPING: |
| 1022 | v.val = 0; |
| 1023 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) |
| 1024 | v.val |= SOF_TIMESTAMPING_TX_HARDWARE; |
| 1025 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) |
| 1026 | v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; |
| 1027 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) |
| 1028 | v.val |= SOF_TIMESTAMPING_RX_HARDWARE; |
| 1029 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) |
| 1030 | v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; |
| 1031 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) |
| 1032 | v.val |= SOF_TIMESTAMPING_SOFTWARE; |
| 1033 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) |
| 1034 | v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; |
| 1035 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) |
| 1036 | v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; |
| 1037 | break; |
| 1038 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1039 | case SO_RCVTIMEO: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1040 | lv = sizeof(struct timeval); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1041 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 1042 | v.tm.tv_sec = 0; |
| 1043 | v.tm.tv_usec = 0; |
| 1044 | } else { |
| 1045 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; |
| 1046 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1048 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1050 | case SO_SNDTIMEO: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1051 | lv = sizeof(struct timeval); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1052 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 1053 | v.tm.tv_sec = 0; |
| 1054 | v.tm.tv_usec = 0; |
| 1055 | } else { |
| 1056 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; |
| 1057 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; |
| 1058 | } |
| 1059 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1061 | case SO_RCVLOWAT: |
| 1062 | v.val = sk->sk_rcvlowat; |
| 1063 | break; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 1064 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1065 | case SO_SNDLOWAT: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1066 | v.val = 1; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1067 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1069 | case SO_PASSCRED: |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 1070 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1071 | break; |
| 1072 | |
| 1073 | case SO_PEERCRED: |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1074 | { |
| 1075 | struct ucred peercred; |
| 1076 | if (len > sizeof(peercred)) |
| 1077 | len = sizeof(peercred); |
| 1078 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); |
| 1079 | if (copy_to_user(optval, &peercred, len)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1080 | return -EFAULT; |
| 1081 | goto lenout; |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1082 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1083 | |
| 1084 | case SO_PEERNAME: |
| 1085 | { |
| 1086 | char address[128]; |
| 1087 | |
| 1088 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) |
| 1089 | return -ENOTCONN; |
| 1090 | if (lv < len) |
| 1091 | return -EINVAL; |
| 1092 | if (copy_to_user(optval, address, len)) |
| 1093 | return -EFAULT; |
| 1094 | goto lenout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1096 | |
| 1097 | /* Dubious BSD thing... Probably nobody even uses it, but |
| 1098 | * the UNIX standard wants it for whatever reason... -DaveM |
| 1099 | */ |
| 1100 | case SO_ACCEPTCONN: |
| 1101 | v.val = sk->sk_state == TCP_LISTEN; |
| 1102 | break; |
| 1103 | |
| 1104 | case SO_PASSSEC: |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 1105 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1106 | break; |
| 1107 | |
| 1108 | case SO_PEERSEC: |
| 1109 | return security_socket_getpeersec_stream(sock, optval, optlen, len); |
| 1110 | |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 1111 | case SO_MARK: |
| 1112 | v.val = sk->sk_mark; |
| 1113 | break; |
| 1114 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1115 | case SO_RXQ_OVFL: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1116 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1117 | break; |
| 1118 | |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 1119 | case SO_WIFI_STATUS: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1120 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 1121 | break; |
| 1122 | |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 1123 | case SO_PEEK_OFF: |
| 1124 | if (!sock->ops->set_peek_off) |
| 1125 | return -EOPNOTSUPP; |
| 1126 | |
| 1127 | v.val = sk->sk_peek_off; |
| 1128 | break; |
David S. Miller | bc2f799 | 2012-02-24 14:48:34 -0500 | [diff] [blame] | 1129 | case SO_NOFCS: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1130 | v.val = sock_flag(sk, SOCK_NOFCS); |
David S. Miller | bc2f799 | 2012-02-24 14:48:34 -0500 | [diff] [blame] | 1131 | break; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1132 | |
Pavel Emelyanov | f7b86bf | 2012-10-18 23:55:56 +0000 | [diff] [blame] | 1133 | case SO_BINDTODEVICE: |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1134 | return sock_getbindtodevice(sk, optval, optlen, len); |
| 1135 | |
Pavel Emelyanov | a8fc927 | 2012-11-01 02:01:48 +0000 | [diff] [blame] | 1136 | case SO_GET_FILTER: |
| 1137 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); |
| 1138 | if (len < 0) |
| 1139 | return len; |
| 1140 | |
| 1141 | goto lenout; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1142 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1143 | default: |
| 1144 | return -ENOPROTOOPT; |
| 1145 | } |
| 1146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | if (len > lv) |
| 1148 | len = lv; |
| 1149 | if (copy_to_user(optval, &v, len)) |
| 1150 | return -EFAULT; |
| 1151 | lenout: |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1152 | if (put_user(len, optlen)) |
| 1153 | return -EFAULT; |
| 1154 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | } |
| 1156 | |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1157 | /* |
| 1158 | * Initialize an sk_lock. |
| 1159 | * |
| 1160 | * (We also register the sk_lock with the lock validator.) |
| 1161 | */ |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 1162 | static inline void sock_lock_init(struct sock *sk) |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1163 | { |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1164 | sock_lock_init_class_and_name(sk, |
| 1165 | af_family_slock_key_strings[sk->sk_family], |
| 1166 | af_family_slock_keys + sk->sk_family, |
| 1167 | af_family_key_strings[sk->sk_family], |
| 1168 | af_family_keys + sk->sk_family); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1169 | } |
| 1170 | |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 1171 | /* |
| 1172 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, |
| 1173 | * 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] | 1174 | * 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] | 1175 | */ |
Pavel Emelyanov | f1a6c4d | 2007-11-01 00:29:45 -0700 | [diff] [blame] | 1176 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
| 1177 | { |
| 1178 | #ifdef CONFIG_SECURITY_NETWORK |
| 1179 | void *sptr = nsk->sk_security; |
| 1180 | #endif |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 1181 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
| 1182 | |
| 1183 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, |
| 1184 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); |
| 1185 | |
Pavel Emelyanov | f1a6c4d | 2007-11-01 00:29:45 -0700 | [diff] [blame] | 1186 | #ifdef CONFIG_SECURITY_NETWORK |
| 1187 | nsk->sk_security = sptr; |
| 1188 | security_sk_clone(osk, nsk); |
| 1189 | #endif |
| 1190 | } |
| 1191 | |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 1192 | /* |
| 1193 | * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes |
| 1194 | * un-modified. Special care is taken when initializing object to zero. |
| 1195 | */ |
| 1196 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) |
| 1197 | { |
| 1198 | if (offsetof(struct sock, sk_node.next) != 0) |
| 1199 | memset(sk, 0, offsetof(struct sock, sk_node.next)); |
| 1200 | memset(&sk->sk_node.pprev, 0, |
| 1201 | size - offsetof(struct sock, sk_node.pprev)); |
| 1202 | } |
| 1203 | |
| 1204 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) |
| 1205 | { |
| 1206 | unsigned long nulls1, nulls2; |
| 1207 | |
| 1208 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); |
| 1209 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); |
| 1210 | if (nulls1 > nulls2) |
| 1211 | swap(nulls1, nulls2); |
| 1212 | |
| 1213 | if (nulls1 != 0) |
| 1214 | memset((char *)sk, 0, nulls1); |
| 1215 | memset((char *)sk + nulls1 + sizeof(void *), 0, |
| 1216 | nulls2 - nulls1 - sizeof(void *)); |
| 1217 | memset((char *)sk + nulls2 + sizeof(void *), 0, |
| 1218 | size - nulls2 - sizeof(void *)); |
| 1219 | } |
| 1220 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); |
| 1221 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1222 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
| 1223 | int family) |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1224 | { |
| 1225 | struct sock *sk; |
| 1226 | struct kmem_cache *slab; |
| 1227 | |
| 1228 | slab = prot->slab; |
Eric Dumazet | e912b11 | 2009-07-08 19:36:05 +0000 | [diff] [blame] | 1229 | if (slab != NULL) { |
| 1230 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); |
| 1231 | if (!sk) |
| 1232 | return sk; |
| 1233 | if (priority & __GFP_ZERO) { |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 1234 | if (prot->clear_sk) |
| 1235 | prot->clear_sk(sk, prot->obj_size); |
| 1236 | else |
| 1237 | sk_prot_clear_nulls(sk, prot->obj_size); |
Eric Dumazet | e912b11 | 2009-07-08 19:36:05 +0000 | [diff] [blame] | 1238 | } |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 1239 | } else |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1240 | sk = kmalloc(prot->obj_size, priority); |
| 1241 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1242 | if (sk != NULL) { |
Vegard Nossum | a98b65a | 2009-02-26 14:46:57 +0100 | [diff] [blame] | 1243 | kmemcheck_annotate_bitfield(sk, flags); |
| 1244 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1245 | if (security_sk_alloc(sk, family, priority)) |
| 1246 | goto out_free; |
| 1247 | |
| 1248 | if (!try_module_get(prot->owner)) |
| 1249 | goto out_free_sec; |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1250 | sk_tx_queue_clear(sk); |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1251 | } |
| 1252 | |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1253 | return sk; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1254 | |
| 1255 | out_free_sec: |
| 1256 | security_sk_free(sk); |
| 1257 | out_free: |
| 1258 | if (slab != NULL) |
| 1259 | kmem_cache_free(slab, sk); |
| 1260 | else |
| 1261 | kfree(sk); |
| 1262 | return NULL; |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1263 | } |
| 1264 | |
| 1265 | static void sk_prot_free(struct proto *prot, struct sock *sk) |
| 1266 | { |
| 1267 | struct kmem_cache *slab; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1268 | struct module *owner; |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1269 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1270 | owner = prot->owner; |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1271 | slab = prot->slab; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1272 | |
| 1273 | security_sk_free(sk); |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1274 | if (slab != NULL) |
| 1275 | kmem_cache_free(slab, sk); |
| 1276 | else |
| 1277 | kfree(sk); |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1278 | module_put(owner); |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1279 | } |
| 1280 | |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1281 | #ifdef CONFIG_CGROUPS |
Daniel Wagner | 8fb974c | 2012-09-12 16:12:02 +0200 | [diff] [blame] | 1282 | #if IS_ENABLED(CONFIG_NET_CLS_CGROUP) |
Daniel Wagner | fd9a08a | 2012-10-25 04:16:58 +0000 | [diff] [blame] | 1283 | void sock_update_classid(struct sock *sk, struct task_struct *task) |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1284 | { |
Paul E. McKenney | 1144182 | 2010-10-06 17:15:35 -0700 | [diff] [blame] | 1285 | u32 classid; |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1286 | |
Daniel Wagner | fd9a08a | 2012-10-25 04:16:58 +0000 | [diff] [blame] | 1287 | classid = task_cls_classid(task); |
Neil Horman | 3afa6d0 | 2012-08-20 07:59:10 +0000 | [diff] [blame] | 1288 | if (classid != sk->sk_classid) |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1289 | sk->sk_classid = classid; |
| 1290 | } |
Herbert Xu | 8286274 | 2010-05-24 00:14:10 -0700 | [diff] [blame] | 1291 | EXPORT_SYMBOL(sock_update_classid); |
Daniel Wagner | 8fb974c | 2012-09-12 16:12:02 +0200 | [diff] [blame] | 1292 | #endif |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1293 | |
Daniel Wagner | 51e4e7f | 2012-09-12 16:12:03 +0200 | [diff] [blame] | 1294 | #if IS_ENABLED(CONFIG_NETPRIO_CGROUP) |
John Fastabend | 406a3c6 | 2012-07-20 10:39:25 +0000 | [diff] [blame] | 1295 | void sock_update_netprioidx(struct sock *sk, struct task_struct *task) |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1296 | { |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1297 | if (in_interrupt()) |
| 1298 | return; |
Neil Horman | 2b73bc6 | 2012-02-10 05:43:38 +0000 | [diff] [blame] | 1299 | |
John Fastabend | 406a3c6 | 2012-07-20 10:39:25 +0000 | [diff] [blame] | 1300 | sk->sk_cgrp_prioidx = task_netprioidx(task); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1301 | } |
| 1302 | EXPORT_SYMBOL_GPL(sock_update_netprioidx); |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1303 | #endif |
Daniel Wagner | 51e4e7f | 2012-09-12 16:12:03 +0200 | [diff] [blame] | 1304 | #endif |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | /** |
| 1307 | * sk_alloc - All socket objects are allocated here |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1308 | * @net: the applicable net namespace |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1309 | * @family: protocol family |
| 1310 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 1311 | * @prot: struct proto associated with this new sock instance |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | */ |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 1313 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 1314 | struct proto *prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | { |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1316 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | |
Pavel Emelyanov | 154adbc | 2007-11-01 00:38:43 -0700 | [diff] [blame] | 1318 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | if (sk) { |
Pavel Emelyanov | 154adbc | 2007-11-01 00:38:43 -0700 | [diff] [blame] | 1320 | sk->sk_family = family; |
| 1321 | /* |
| 1322 | * See comment in struct sock definition to understand |
| 1323 | * why we need sk_prot_creator -acme |
| 1324 | */ |
| 1325 | sk->sk_prot = sk->sk_prot_creator = prot; |
| 1326 | sock_lock_init(sk); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1327 | sock_net_set(sk, get_net(net)); |
Jarek Poplawski | d66ee05 | 2009-08-30 23:15:36 +0000 | [diff] [blame] | 1328 | atomic_set(&sk->sk_wmem_alloc, 1); |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1329 | |
Daniel Wagner | fd9a08a | 2012-10-25 04:16:58 +0000 | [diff] [blame] | 1330 | sock_update_classid(sk, current); |
John Fastabend | 406a3c6 | 2012-07-20 10:39:25 +0000 | [diff] [blame] | 1331 | sock_update_netprioidx(sk, current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | } |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1333 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1334 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1336 | EXPORT_SYMBOL(sk_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1338 | static void __sk_free(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | { |
| 1340 | struct sk_filter *filter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | |
| 1342 | if (sk->sk_destruct) |
| 1343 | sk->sk_destruct(sk); |
| 1344 | |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 1345 | filter = rcu_dereference_check(sk->sk_filter, |
| 1346 | atomic_read(&sk->sk_wmem_alloc) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | if (filter) { |
Pavel Emelyanov | 309dd5f | 2007-10-17 21:21:51 -0700 | [diff] [blame] | 1348 | sk_filter_uncharge(sk, filter); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 1349 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | } |
| 1351 | |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 1352 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | |
| 1354 | if (atomic_read(&sk->sk_omem_alloc)) |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 1355 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
| 1356 | __func__, atomic_read(&sk->sk_omem_alloc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1358 | if (sk->sk_peer_cred) |
| 1359 | put_cred(sk->sk_peer_cred); |
| 1360 | put_pid(sk->sk_peer_pid); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1361 | put_net(sock_net(sk)); |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1362 | sk_prot_free(sk->sk_prot_creator, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | } |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1364 | |
| 1365 | void sk_free(struct sock *sk) |
| 1366 | { |
| 1367 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1368 | * We subtract one from sk_wmem_alloc and can know if |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1369 | * some packets are still in some tx queue. |
| 1370 | * If not null, sock_wfree() will call __sk_free(sk) later |
| 1371 | */ |
| 1372 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) |
| 1373 | __sk_free(sk); |
| 1374 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1375 | EXPORT_SYMBOL(sk_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1377 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1378 | * Last sock_put should drop reference to sk->sk_net. It has already |
| 1379 | * been dropped in sk_change_net. Taking reference to stopping namespace |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1380 | * is not an option. |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1381 | * 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] | 1382 | * destroy it in the context of init_net. |
| 1383 | */ |
| 1384 | void sk_release_kernel(struct sock *sk) |
| 1385 | { |
| 1386 | if (sk == NULL || sk->sk_socket == NULL) |
| 1387 | return; |
| 1388 | |
| 1389 | sock_hold(sk); |
| 1390 | sock_release(sk->sk_socket); |
Denis V. Lunev | 65a18ec | 2008-04-16 01:59:46 -0700 | [diff] [blame] | 1391 | release_net(sock_net(sk)); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1392 | sock_net_set(sk, get_net(&init_net)); |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1393 | sock_put(sk); |
| 1394 | } |
David S. Miller | 45af175 | 2008-02-29 11:33:19 -0800 | [diff] [blame] | 1395 | EXPORT_SYMBOL(sk_release_kernel); |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1396 | |
Stephen Rothwell | 475f1b5 | 2012-01-09 16:33:16 +1100 | [diff] [blame] | 1397 | static void sk_update_clone(const struct sock *sk, struct sock *newsk) |
| 1398 | { |
| 1399 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
| 1400 | sock_update_memcg(newsk); |
| 1401 | } |
| 1402 | |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 1403 | /** |
| 1404 | * sk_clone_lock - clone a socket, and lock its clone |
| 1405 | * @sk: the socket to clone |
| 1406 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 1407 | * |
| 1408 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) |
| 1409 | */ |
| 1410 | 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] | 1411 | { |
Pavel Emelyanov | 8fd1d17 | 2007-11-01 00:37:32 -0700 | [diff] [blame] | 1412 | struct sock *newsk; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1413 | |
Pavel Emelyanov | 8fd1d17 | 2007-11-01 00:37:32 -0700 | [diff] [blame] | 1414 | 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] | 1415 | if (newsk != NULL) { |
| 1416 | struct sk_filter *filter; |
| 1417 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 1418 | sock_copy(newsk, sk); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1419 | |
| 1420 | /* SANITY */ |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1421 | get_net(sock_net(newsk)); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1422 | sk_node_init(&newsk->sk_node); |
| 1423 | sock_lock_init(newsk); |
| 1424 | bh_lock_sock(newsk); |
Eric Dumazet | fa438cc | 2007-03-04 16:05:44 -0800 | [diff] [blame] | 1425 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 1426 | newsk->sk_backlog.len = 0; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1427 | |
| 1428 | atomic_set(&newsk->sk_rmem_alloc, 0); |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1429 | /* |
| 1430 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) |
| 1431 | */ |
| 1432 | atomic_set(&newsk->sk_wmem_alloc, 1); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1433 | atomic_set(&newsk->sk_omem_alloc, 0); |
| 1434 | skb_queue_head_init(&newsk->sk_receive_queue); |
| 1435 | skb_queue_head_init(&newsk->sk_write_queue); |
Chris Leech | 97fc2f0 | 2006-05-23 17:55:33 -0700 | [diff] [blame] | 1436 | #ifdef CONFIG_NET_DMA |
| 1437 | skb_queue_head_init(&newsk->sk_async_wait_queue); |
| 1438 | #endif |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1439 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1440 | spin_lock_init(&newsk->sk_dst_lock); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1441 | rwlock_init(&newsk->sk_callback_lock); |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 1442 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
| 1443 | af_callback_keys + newsk->sk_family, |
| 1444 | af_family_clock_key_strings[newsk->sk_family]); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1445 | |
| 1446 | newsk->sk_dst_cache = NULL; |
| 1447 | newsk->sk_wmem_queued = 0; |
| 1448 | newsk->sk_forward_alloc = 0; |
| 1449 | newsk->sk_send_head = NULL; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1450 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
| 1451 | |
| 1452 | sock_reset_flag(newsk, SOCK_DONE); |
| 1453 | skb_queue_head_init(&newsk->sk_error_queue); |
| 1454 | |
Eric Dumazet | 0d7da9d | 2010-10-25 03:47:05 +0000 | [diff] [blame] | 1455 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1456 | if (filter != NULL) |
| 1457 | sk_filter_charge(newsk, filter); |
| 1458 | |
| 1459 | if (unlikely(xfrm_sk_clone_policy(newsk))) { |
| 1460 | /* It is still raw copy of parent, so invalidate |
| 1461 | * destructor and make plain sk_free() */ |
| 1462 | newsk->sk_destruct = NULL; |
Thomas Gleixner | b0691c8 | 2011-10-25 02:30:50 +0000 | [diff] [blame] | 1463 | bh_unlock_sock(newsk); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1464 | sk_free(newsk); |
| 1465 | newsk = NULL; |
| 1466 | goto out; |
| 1467 | } |
| 1468 | |
| 1469 | newsk->sk_err = 0; |
| 1470 | newsk->sk_priority = 0; |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 1471 | /* |
| 1472 | * Before updating sk_refcnt, we must commit prior changes to memory |
| 1473 | * (Documentation/RCU/rculist_nulls.txt for details) |
| 1474 | */ |
| 1475 | smp_wmb(); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1476 | atomic_set(&newsk->sk_refcnt, 2); |
| 1477 | |
| 1478 | /* |
| 1479 | * Increment the counter in the same struct proto as the master |
| 1480 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that |
| 1481 | * is the same as sk->sk_prot->socks, as this field was copied |
| 1482 | * with memcpy). |
| 1483 | * |
| 1484 | * This _changes_ the previous behaviour, where |
| 1485 | * tcp_create_openreq_child always was incrementing the |
| 1486 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have |
| 1487 | * to be taken into account in all callers. -acme |
| 1488 | */ |
| 1489 | sk_refcnt_debug_inc(newsk); |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1490 | sk_set_socket(newsk, NULL); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1491 | newsk->sk_wq = NULL; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1492 | |
Glauber Costa | f3f511e | 2012-01-05 20:16:39 +0000 | [diff] [blame] | 1493 | sk_update_clone(sk, newsk); |
| 1494 | |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1495 | if (newsk->sk_prot->sockets_allocated) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1496 | sk_sockets_allocated_inc(newsk); |
Octavian Purdila | 704da560 | 2010-01-08 00:00:09 -0800 | [diff] [blame] | 1497 | |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 1498 | if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) |
Octavian Purdila | 704da560 | 2010-01-08 00:00:09 -0800 | [diff] [blame] | 1499 | net_enable_timestamp(); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1500 | } |
| 1501 | out: |
| 1502 | return newsk; |
| 1503 | } |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 1504 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1505 | |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1506 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
| 1507 | { |
| 1508 | __sk_dst_set(sk, dst); |
| 1509 | sk->sk_route_caps = dst->dev->features; |
| 1510 | if (sk->sk_route_caps & NETIF_F_GSO) |
Herbert Xu | 4fcd6b9 | 2007-05-31 22:15:50 -0700 | [diff] [blame] | 1511 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1512 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1513 | if (sk_can_gso(sk)) { |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1514 | if (dst->header_len) { |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1515 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1516 | } else { |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1517 | 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] | 1518 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
Ben Hutchings | 1485348 | 2012-07-30 16:11:42 +0000 | [diff] [blame] | 1519 | sk->sk_gso_max_segs = dst->dev->gso_max_segs; |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1520 | } |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1521 | } |
| 1522 | } |
| 1523 | EXPORT_SYMBOL_GPL(sk_setup_caps); |
| 1524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | /* |
| 1526 | * Simple resource managers for sockets. |
| 1527 | */ |
| 1528 | |
| 1529 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1530 | /* |
| 1531 | * Write buffer destructor automatically called from kfree_skb. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | */ |
| 1533 | void sock_wfree(struct sk_buff *skb) |
| 1534 | { |
| 1535 | struct sock *sk = skb->sk; |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1536 | unsigned int len = skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1538 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
| 1539 | /* |
| 1540 | * Keep a reference on sk_wmem_alloc, this will be released |
| 1541 | * after sk_write_space() call |
| 1542 | */ |
| 1543 | atomic_sub(len - 1, &sk->sk_wmem_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | sk->sk_write_space(sk); |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1545 | len = 1; |
| 1546 | } |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1547 | /* |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1548 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
| 1549 | * could not do because of in-flight packets |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1550 | */ |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1551 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1552 | __sk_free(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1554 | EXPORT_SYMBOL(sock_wfree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1556 | /* |
| 1557 | * Read buffer destructor automatically called from kfree_skb. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1558 | */ |
| 1559 | void sock_rfree(struct sk_buff *skb) |
| 1560 | { |
| 1561 | struct sock *sk = skb->sk; |
Eric Dumazet | d361fd5 | 2010-07-10 22:45:17 +0000 | [diff] [blame] | 1562 | unsigned int len = skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | |
Eric Dumazet | d361fd5 | 2010-07-10 22:45:17 +0000 | [diff] [blame] | 1564 | atomic_sub(len, &sk->sk_rmem_alloc); |
| 1565 | sk_mem_uncharge(sk, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1567 | EXPORT_SYMBOL(sock_rfree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1569 | void sock_edemux(struct sk_buff *skb) |
| 1570 | { |
Eric Dumazet | e812347 | 2012-09-02 23:57:18 +0000 | [diff] [blame] | 1571 | struct sock *sk = skb->sk; |
| 1572 | |
Randy Dunlap | 1c463e5 | 2012-09-10 09:13:07 -0700 | [diff] [blame] | 1573 | #ifdef CONFIG_INET |
Eric Dumazet | e812347 | 2012-09-02 23:57:18 +0000 | [diff] [blame] | 1574 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1575 | inet_twsk_put(inet_twsk(sk)); |
| 1576 | else |
Randy Dunlap | 1c463e5 | 2012-09-10 09:13:07 -0700 | [diff] [blame] | 1577 | #endif |
Eric Dumazet | e812347 | 2012-09-02 23:57:18 +0000 | [diff] [blame] | 1578 | sock_put(sk); |
David S. Miller | 41063e9 | 2012-06-19 21:22:05 -0700 | [diff] [blame] | 1579 | } |
| 1580 | EXPORT_SYMBOL(sock_edemux); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | |
Eric W. Biederman | 976d0201 | 2012-05-23 17:16:53 -0600 | [diff] [blame] | 1582 | kuid_t sock_i_uid(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | { |
Eric W. Biederman | 976d0201 | 2012-05-23 17:16:53 -0600 | [diff] [blame] | 1584 | kuid_t uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1586 | read_lock_bh(&sk->sk_callback_lock); |
Eric W. Biederman | 976d0201 | 2012-05-23 17:16:53 -0600 | [diff] [blame] | 1587 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1588 | read_unlock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | return uid; |
| 1590 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1591 | EXPORT_SYMBOL(sock_i_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | |
| 1593 | unsigned long sock_i_ino(struct sock *sk) |
| 1594 | { |
| 1595 | unsigned long ino; |
| 1596 | |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1597 | read_lock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1599 | read_unlock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | return ino; |
| 1601 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1602 | EXPORT_SYMBOL(sock_i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | |
| 1604 | /* |
| 1605 | * Allocate a skb from the socket's send buffer. |
| 1606 | */ |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 1607 | 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] | 1608 | gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | { |
| 1610 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1611 | struct sk_buff *skb = alloc_skb(size, priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | if (skb) { |
| 1613 | skb_set_owner_w(skb, sk); |
| 1614 | return skb; |
| 1615 | } |
| 1616 | } |
| 1617 | return NULL; |
| 1618 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1619 | EXPORT_SYMBOL(sock_wmalloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | |
| 1621 | /* |
| 1622 | * Allocate a skb from the socket's receive buffer. |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1623 | */ |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 1624 | 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] | 1625 | gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | { |
| 1627 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
| 1628 | struct sk_buff *skb = alloc_skb(size, priority); |
| 1629 | if (skb) { |
| 1630 | skb_set_owner_r(skb, sk); |
| 1631 | return skb; |
| 1632 | } |
| 1633 | } |
| 1634 | return NULL; |
| 1635 | } |
| 1636 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1637 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | * Allocate a memory block from the socket's option memory buffer. |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1639 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1640 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1642 | if ((unsigned int)size <= sysctl_optmem_max && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
| 1644 | void *mem; |
| 1645 | /* First do the add, to avoid the race if kmalloc |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1646 | * might sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | */ |
| 1648 | atomic_add(size, &sk->sk_omem_alloc); |
| 1649 | mem = kmalloc(size, priority); |
| 1650 | if (mem) |
| 1651 | return mem; |
| 1652 | atomic_sub(size, &sk->sk_omem_alloc); |
| 1653 | } |
| 1654 | return NULL; |
| 1655 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1656 | EXPORT_SYMBOL(sock_kmalloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | |
| 1658 | /* |
| 1659 | * Free an option memory block. |
| 1660 | */ |
| 1661 | void sock_kfree_s(struct sock *sk, void *mem, int size) |
| 1662 | { |
| 1663 | kfree(mem); |
| 1664 | atomic_sub(size, &sk->sk_omem_alloc); |
| 1665 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1666 | EXPORT_SYMBOL(sock_kfree_s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | |
| 1668 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
| 1669 | I think, these locks should be removed for datagram sockets. |
| 1670 | */ |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1671 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | { |
| 1673 | DEFINE_WAIT(wait); |
| 1674 | |
| 1675 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 1676 | for (;;) { |
| 1677 | if (!timeo) |
| 1678 | break; |
| 1679 | if (signal_pending(current)) |
| 1680 | break; |
| 1681 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1682 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
| 1684 | break; |
| 1685 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1686 | break; |
| 1687 | if (sk->sk_err) |
| 1688 | break; |
| 1689 | timeo = schedule_timeout(timeo); |
| 1690 | } |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1691 | finish_wait(sk_sleep(sk), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | return timeo; |
| 1693 | } |
| 1694 | |
| 1695 | |
| 1696 | /* |
| 1697 | * Generic send/receive buffer handlers |
| 1698 | */ |
| 1699 | |
Herbert Xu | 4cc7f68 | 2009-02-04 16:55:54 -0800 | [diff] [blame] | 1700 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
| 1701 | unsigned long data_len, int noblock, |
| 1702 | int *errcode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | { |
| 1704 | struct sk_buff *skb; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 1705 | gfp_t gfp_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | long timeo; |
| 1707 | int err; |
Jason Wang | cc9b17a | 2012-05-30 21:18:10 +0000 | [diff] [blame] | 1708 | int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; |
| 1709 | |
| 1710 | err = -EMSGSIZE; |
| 1711 | if (npages > MAX_SKB_FRAGS) |
| 1712 | goto failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | |
| 1714 | gfp_mask = sk->sk_allocation; |
| 1715 | if (gfp_mask & __GFP_WAIT) |
| 1716 | gfp_mask |= __GFP_REPEAT; |
| 1717 | |
| 1718 | timeo = sock_sndtimeo(sk, noblock); |
| 1719 | while (1) { |
| 1720 | err = sock_error(sk); |
| 1721 | if (err != 0) |
| 1722 | goto failure; |
| 1723 | |
| 1724 | err = -EPIPE; |
| 1725 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1726 | goto failure; |
| 1727 | |
| 1728 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
Larry Woodman | db38c179 | 2006-11-03 16:05:45 -0800 | [diff] [blame] | 1729 | skb = alloc_skb(header_len, gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | if (skb) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | int i; |
| 1732 | |
| 1733 | /* No pages, we're done... */ |
| 1734 | if (!data_len) |
| 1735 | break; |
| 1736 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | skb->truesize += data_len; |
| 1738 | skb_shinfo(skb)->nr_frags = npages; |
| 1739 | for (i = 0; i < npages; i++) { |
| 1740 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1741 | |
| 1742 | page = alloc_pages(sk->sk_allocation, 0); |
| 1743 | if (!page) { |
| 1744 | err = -ENOBUFS; |
| 1745 | skb_shinfo(skb)->nr_frags = i; |
| 1746 | kfree_skb(skb); |
| 1747 | goto failure; |
| 1748 | } |
| 1749 | |
Ian Campbell | ea2ab69 | 2011-08-22 23:44:58 +0000 | [diff] [blame] | 1750 | __skb_fill_page_desc(skb, i, |
| 1751 | page, 0, |
| 1752 | (data_len >= PAGE_SIZE ? |
| 1753 | PAGE_SIZE : |
| 1754 | data_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | data_len -= PAGE_SIZE; |
| 1756 | } |
| 1757 | |
| 1758 | /* Full success... */ |
| 1759 | break; |
| 1760 | } |
| 1761 | err = -ENOBUFS; |
| 1762 | goto failure; |
| 1763 | } |
| 1764 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 1765 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 1766 | err = -EAGAIN; |
| 1767 | if (!timeo) |
| 1768 | goto failure; |
| 1769 | if (signal_pending(current)) |
| 1770 | goto interrupted; |
| 1771 | timeo = sock_wait_for_wmem(sk, timeo); |
| 1772 | } |
| 1773 | |
| 1774 | skb_set_owner_w(skb, sk); |
| 1775 | return skb; |
| 1776 | |
| 1777 | interrupted: |
| 1778 | err = sock_intr_errno(timeo); |
| 1779 | failure: |
| 1780 | *errcode = err; |
| 1781 | return NULL; |
| 1782 | } |
Herbert Xu | 4cc7f68 | 2009-02-04 16:55:54 -0800 | [diff] [blame] | 1783 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1785 | 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] | 1786 | int noblock, int *errcode) |
| 1787 | { |
| 1788 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); |
| 1789 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1790 | EXPORT_SYMBOL(sock_alloc_send_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1792 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
| 1793 | #define SKB_FRAG_PAGE_ORDER get_order(32768) |
| 1794 | |
| 1795 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) |
| 1796 | { |
| 1797 | int order; |
| 1798 | |
| 1799 | if (pfrag->page) { |
| 1800 | if (atomic_read(&pfrag->page->_count) == 1) { |
| 1801 | pfrag->offset = 0; |
| 1802 | return true; |
| 1803 | } |
| 1804 | if (pfrag->offset < pfrag->size) |
| 1805 | return true; |
| 1806 | put_page(pfrag->page); |
| 1807 | } |
| 1808 | |
| 1809 | /* We restrict high order allocations to users that can afford to wait */ |
| 1810 | order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0; |
| 1811 | |
| 1812 | do { |
| 1813 | gfp_t gfp = sk->sk_allocation; |
| 1814 | |
| 1815 | if (order) |
| 1816 | gfp |= __GFP_COMP | __GFP_NOWARN; |
| 1817 | pfrag->page = alloc_pages(gfp, order); |
| 1818 | if (likely(pfrag->page)) { |
| 1819 | pfrag->offset = 0; |
| 1820 | pfrag->size = PAGE_SIZE << order; |
| 1821 | return true; |
| 1822 | } |
| 1823 | } while (--order >= 0); |
| 1824 | |
| 1825 | sk_enter_memory_pressure(sk); |
| 1826 | sk_stream_moderate_sndbuf(sk); |
| 1827 | return false; |
| 1828 | } |
| 1829 | EXPORT_SYMBOL(sk_page_frag_refill); |
| 1830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | static void __lock_sock(struct sock *sk) |
Namhyung Kim | f39234d | 2010-09-08 03:48:48 +0000 | [diff] [blame] | 1832 | __releases(&sk->sk_lock.slock) |
| 1833 | __acquires(&sk->sk_lock.slock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | { |
| 1835 | DEFINE_WAIT(wait); |
| 1836 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1837 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
| 1839 | TASK_UNINTERRUPTIBLE); |
| 1840 | spin_unlock_bh(&sk->sk_lock.slock); |
| 1841 | schedule(); |
| 1842 | spin_lock_bh(&sk->sk_lock.slock); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1843 | if (!sock_owned_by_user(sk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | break; |
| 1845 | } |
| 1846 | finish_wait(&sk->sk_lock.wq, &wait); |
| 1847 | } |
| 1848 | |
| 1849 | static void __release_sock(struct sock *sk) |
Namhyung Kim | f39234d | 2010-09-08 03:48:48 +0000 | [diff] [blame] | 1850 | __releases(&sk->sk_lock.slock) |
| 1851 | __acquires(&sk->sk_lock.slock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | { |
| 1853 | struct sk_buff *skb = sk->sk_backlog.head; |
| 1854 | |
| 1855 | do { |
| 1856 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
| 1857 | bh_unlock_sock(sk); |
| 1858 | |
| 1859 | do { |
| 1860 | struct sk_buff *next = skb->next; |
| 1861 | |
Eric Dumazet | e4cbb02 | 2012-04-30 16:07:09 +0000 | [diff] [blame] | 1862 | prefetch(next); |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 1863 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | skb->next = NULL; |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 1865 | sk_backlog_rcv(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | |
| 1867 | /* |
| 1868 | * We are in process context here with softirqs |
| 1869 | * disabled, use cond_resched_softirq() to preempt. |
| 1870 | * This is safe to do because we've taken the backlog |
| 1871 | * queue private: |
| 1872 | */ |
| 1873 | cond_resched_softirq(); |
| 1874 | |
| 1875 | skb = next; |
| 1876 | } while (skb != NULL); |
| 1877 | |
| 1878 | bh_lock_sock(sk); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1879 | } while ((skb = sk->sk_backlog.head) != NULL); |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 1880 | |
| 1881 | /* |
| 1882 | * Doing the zeroing here guarantee we can not loop forever |
| 1883 | * while a wild producer attempts to flood us. |
| 1884 | */ |
| 1885 | sk->sk_backlog.len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | } |
| 1887 | |
| 1888 | /** |
| 1889 | * sk_wait_data - wait for data to arrive at sk_receive_queue |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1890 | * @sk: sock to wait on |
| 1891 | * @timeo: for how long |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | * |
| 1893 | * Now socket state including sk->sk_err is changed only under lock, |
| 1894 | * hence we may omit checks after joining wait queue. |
| 1895 | * We check receive queue before schedule() only as optimization; |
| 1896 | * it is very likely that release_sock() added new data. |
| 1897 | */ |
| 1898 | int sk_wait_data(struct sock *sk, long *timeo) |
| 1899 | { |
| 1900 | int rc; |
| 1901 | DEFINE_WAIT(wait); |
| 1902 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1903 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
| 1905 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); |
| 1906 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1907 | finish_wait(sk_sleep(sk), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | return rc; |
| 1909 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | EXPORT_SYMBOL(sk_wait_data); |
| 1911 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1912 | /** |
| 1913 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated |
| 1914 | * @sk: socket |
| 1915 | * @size: memory size to allocate |
| 1916 | * @kind: allocation type |
| 1917 | * |
| 1918 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means |
| 1919 | * rmem allocation. This function assumes that protocols which have |
| 1920 | * memory_pressure use sk_wmem_queued as write buffer accounting. |
| 1921 | */ |
| 1922 | int __sk_mem_schedule(struct sock *sk, int size, int kind) |
| 1923 | { |
| 1924 | struct proto *prot = sk->sk_prot; |
| 1925 | int amt = sk_mem_pages(size); |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 1926 | long allocated; |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1927 | int parent_status = UNDER_LIMIT; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1928 | |
| 1929 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1930 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1931 | allocated = sk_memory_allocated_add(sk, amt, &parent_status); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1932 | |
| 1933 | /* Under limit. */ |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1934 | if (parent_status == UNDER_LIMIT && |
| 1935 | allocated <= sk_prot_mem_limits(sk, 0)) { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1936 | sk_leave_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1937 | return 1; |
| 1938 | } |
| 1939 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1940 | /* Under pressure. (we or our parents) */ |
| 1941 | if ((parent_status > SOFT_LIMIT) || |
| 1942 | allocated > sk_prot_mem_limits(sk, 1)) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1943 | sk_enter_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1944 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 1945 | /* Over hard limit (we or our parents) */ |
| 1946 | if ((parent_status == OVER_LIMIT) || |
| 1947 | (allocated > sk_prot_mem_limits(sk, 2))) |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1948 | goto suppress_allocation; |
| 1949 | |
| 1950 | /* guarantee minimum buffer size under pressure */ |
| 1951 | if (kind == SK_MEM_RECV) { |
| 1952 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) |
| 1953 | return 1; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1954 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1955 | } else { /* SK_MEM_SEND */ |
| 1956 | if (sk->sk_type == SOCK_STREAM) { |
| 1957 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) |
| 1958 | return 1; |
| 1959 | } else if (atomic_read(&sk->sk_wmem_alloc) < |
| 1960 | prot->sysctl_wmem[0]) |
| 1961 | return 1; |
| 1962 | } |
| 1963 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1964 | if (sk_has_memory_pressure(sk)) { |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 1965 | int alloc; |
| 1966 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1967 | if (!sk_under_memory_pressure(sk)) |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 1968 | return 1; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1969 | alloc = sk_sockets_allocated_read_positive(sk); |
| 1970 | if (sk_prot_mem_limits(sk, 2) > alloc * |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1971 | sk_mem_pages(sk->sk_wmem_queued + |
| 1972 | atomic_read(&sk->sk_rmem_alloc) + |
| 1973 | sk->sk_forward_alloc)) |
| 1974 | return 1; |
| 1975 | } |
| 1976 | |
| 1977 | suppress_allocation: |
| 1978 | |
| 1979 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { |
| 1980 | sk_stream_moderate_sndbuf(sk); |
| 1981 | |
| 1982 | /* Fail only if socket is _under_ its sndbuf. |
| 1983 | * In this case we cannot block, so that we have to fail. |
| 1984 | */ |
| 1985 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) |
| 1986 | return 1; |
| 1987 | } |
| 1988 | |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 1989 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
| 1990 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1991 | /* Alas. Undo changes. */ |
| 1992 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1993 | |
Glauber Costa | 0e90b31 | 2012-01-20 04:57:16 +0000 | [diff] [blame] | 1994 | sk_memory_allocated_sub(sk, amt); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1995 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1996 | return 0; |
| 1997 | } |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1998 | EXPORT_SYMBOL(__sk_mem_schedule); |
| 1999 | |
| 2000 | /** |
| 2001 | * __sk_reclaim - reclaim memory_allocated |
| 2002 | * @sk: socket |
| 2003 | */ |
| 2004 | void __sk_mem_reclaim(struct sock *sk) |
| 2005 | { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2006 | sk_memory_allocated_sub(sk, |
Glauber Costa | 0e90b31 | 2012-01-20 04:57:16 +0000 | [diff] [blame] | 2007 | sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2008 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; |
| 2009 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2010 | if (sk_under_memory_pressure(sk) && |
| 2011 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) |
| 2012 | sk_leave_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2013 | } |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2014 | EXPORT_SYMBOL(__sk_mem_reclaim); |
| 2015 | |
| 2016 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | /* |
| 2018 | * Set of default routines for initialising struct proto_ops when |
| 2019 | * the protocol does not support a particular function. In certain |
| 2020 | * cases where it makes no sense for a protocol to have a "do nothing" |
| 2021 | * function, some default processing is provided. |
| 2022 | */ |
| 2023 | |
| 2024 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) |
| 2025 | { |
| 2026 | return -EOPNOTSUPP; |
| 2027 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2028 | EXPORT_SYMBOL(sock_no_bind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2029 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2030 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | int len, int flags) |
| 2032 | { |
| 2033 | return -EOPNOTSUPP; |
| 2034 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2035 | EXPORT_SYMBOL(sock_no_connect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | |
| 2037 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) |
| 2038 | { |
| 2039 | return -EOPNOTSUPP; |
| 2040 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2041 | EXPORT_SYMBOL(sock_no_socketpair); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2042 | |
| 2043 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) |
| 2044 | { |
| 2045 | return -EOPNOTSUPP; |
| 2046 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2047 | EXPORT_SYMBOL(sock_no_accept); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2049 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | int *len, int peer) |
| 2051 | { |
| 2052 | return -EOPNOTSUPP; |
| 2053 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2054 | EXPORT_SYMBOL(sock_no_getname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2056 | 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] | 2057 | { |
| 2058 | return 0; |
| 2059 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2060 | EXPORT_SYMBOL(sock_no_poll); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | |
| 2062 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 2063 | { |
| 2064 | return -EOPNOTSUPP; |
| 2065 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2066 | EXPORT_SYMBOL(sock_no_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | |
| 2068 | int sock_no_listen(struct socket *sock, int backlog) |
| 2069 | { |
| 2070 | return -EOPNOTSUPP; |
| 2071 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2072 | EXPORT_SYMBOL(sock_no_listen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | |
| 2074 | int sock_no_shutdown(struct socket *sock, int how) |
| 2075 | { |
| 2076 | return -EOPNOTSUPP; |
| 2077 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2078 | EXPORT_SYMBOL(sock_no_shutdown); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2079 | |
| 2080 | int sock_no_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2081 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2082 | { |
| 2083 | return -EOPNOTSUPP; |
| 2084 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2085 | EXPORT_SYMBOL(sock_no_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | |
| 2087 | int sock_no_getsockopt(struct socket *sock, int level, int optname, |
| 2088 | char __user *optval, int __user *optlen) |
| 2089 | { |
| 2090 | return -EOPNOTSUPP; |
| 2091 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2092 | EXPORT_SYMBOL(sock_no_getsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | |
| 2094 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, |
| 2095 | size_t len) |
| 2096 | { |
| 2097 | return -EOPNOTSUPP; |
| 2098 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2099 | EXPORT_SYMBOL(sock_no_sendmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | |
| 2101 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, |
| 2102 | size_t len, int flags) |
| 2103 | { |
| 2104 | return -EOPNOTSUPP; |
| 2105 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2106 | EXPORT_SYMBOL(sock_no_recvmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | |
| 2108 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) |
| 2109 | { |
| 2110 | /* Mirror missing mmap method error code */ |
| 2111 | return -ENODEV; |
| 2112 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2113 | EXPORT_SYMBOL(sock_no_mmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | |
| 2115 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) |
| 2116 | { |
| 2117 | ssize_t res; |
| 2118 | struct msghdr msg = {.msg_flags = flags}; |
| 2119 | struct kvec iov; |
| 2120 | char *kaddr = kmap(page); |
| 2121 | iov.iov_base = kaddr + offset; |
| 2122 | iov.iov_len = size; |
| 2123 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); |
| 2124 | kunmap(page); |
| 2125 | return res; |
| 2126 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2127 | EXPORT_SYMBOL(sock_no_sendpage); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | |
| 2129 | /* |
| 2130 | * Default Socket Callbacks |
| 2131 | */ |
| 2132 | |
| 2133 | static void sock_def_wakeup(struct sock *sk) |
| 2134 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2135 | struct socket_wq *wq; |
| 2136 | |
| 2137 | rcu_read_lock(); |
| 2138 | wq = rcu_dereference(sk->sk_wq); |
| 2139 | if (wq_has_sleeper(wq)) |
| 2140 | wake_up_interruptible_all(&wq->wait); |
| 2141 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2142 | } |
| 2143 | |
| 2144 | static void sock_def_error_report(struct sock *sk) |
| 2145 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2146 | struct socket_wq *wq; |
| 2147 | |
| 2148 | rcu_read_lock(); |
| 2149 | wq = rcu_dereference(sk->sk_wq); |
| 2150 | if (wq_has_sleeper(wq)) |
| 2151 | wake_up_interruptible_poll(&wq->wait, POLLERR); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2152 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2153 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | } |
| 2155 | |
| 2156 | static void sock_def_readable(struct sock *sk, int len) |
| 2157 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2158 | struct socket_wq *wq; |
| 2159 | |
| 2160 | rcu_read_lock(); |
| 2161 | wq = rcu_dereference(sk->sk_wq); |
| 2162 | if (wq_has_sleeper(wq)) |
Eric Dumazet | 2c6607c | 2011-01-06 10:54:29 -0800 | [diff] [blame] | 2163 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
Davide Libenzi | 37e5540 | 2009-03-31 15:24:21 -0700 | [diff] [blame] | 2164 | POLLRDNORM | POLLRDBAND); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2165 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2166 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2167 | } |
| 2168 | |
| 2169 | static void sock_def_write_space(struct sock *sk) |
| 2170 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2171 | struct socket_wq *wq; |
| 2172 | |
| 2173 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | |
| 2175 | /* Do not wake up a writer until he can make "significant" |
| 2176 | * progress. --DaveM |
| 2177 | */ |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 2178 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2179 | wq = rcu_dereference(sk->sk_wq); |
| 2180 | if (wq_has_sleeper(wq)) |
| 2181 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
Davide Libenzi | 37e5540 | 2009-03-31 15:24:21 -0700 | [diff] [blame] | 2182 | POLLWRNORM | POLLWRBAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | |
| 2184 | /* Should agree with poll, otherwise some programs break */ |
| 2185 | if (sock_writeable(sk)) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2186 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | } |
| 2188 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2189 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | } |
| 2191 | |
| 2192 | static void sock_def_destruct(struct sock *sk) |
| 2193 | { |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 2194 | kfree(sk->sk_protinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | } |
| 2196 | |
| 2197 | void sk_send_sigurg(struct sock *sk) |
| 2198 | { |
| 2199 | if (sk->sk_socket && sk->sk_socket->file) |
| 2200 | if (send_sigurg(&sk->sk_socket->file->f_owner)) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2201 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2203 | EXPORT_SYMBOL(sk_send_sigurg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | |
| 2205 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, |
| 2206 | unsigned long expires) |
| 2207 | { |
| 2208 | if (!mod_timer(timer, expires)) |
| 2209 | sock_hold(sk); |
| 2210 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | EXPORT_SYMBOL(sk_reset_timer); |
| 2212 | |
| 2213 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) |
| 2214 | { |
| 2215 | if (timer_pending(timer) && del_timer(timer)) |
| 2216 | __sock_put(sk); |
| 2217 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | EXPORT_SYMBOL(sk_stop_timer); |
| 2219 | |
| 2220 | void sock_init_data(struct socket *sock, struct sock *sk) |
| 2221 | { |
| 2222 | skb_queue_head_init(&sk->sk_receive_queue); |
| 2223 | skb_queue_head_init(&sk->sk_write_queue); |
| 2224 | skb_queue_head_init(&sk->sk_error_queue); |
Chris Leech | 97fc2f0 | 2006-05-23 17:55:33 -0700 | [diff] [blame] | 2225 | #ifdef CONFIG_NET_DMA |
| 2226 | skb_queue_head_init(&sk->sk_async_wait_queue); |
| 2227 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | |
| 2229 | sk->sk_send_head = NULL; |
| 2230 | |
| 2231 | init_timer(&sk->sk_timer); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | sk->sk_allocation = GFP_KERNEL; |
| 2234 | sk->sk_rcvbuf = sysctl_rmem_default; |
| 2235 | sk->sk_sndbuf = sysctl_wmem_default; |
| 2236 | sk->sk_state = TCP_CLOSE; |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 2237 | sk_set_socket(sk, sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2238 | |
| 2239 | sock_set_flag(sk, SOCK_ZAPPED); |
| 2240 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 2241 | if (sock) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | sk->sk_type = sock->type; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2243 | sk->sk_wq = sock->wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | sock->sk = sk; |
| 2245 | } else |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2246 | sk->sk_wq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 2248 | spin_lock_init(&sk->sk_dst_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | rwlock_init(&sk->sk_callback_lock); |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 2250 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
| 2251 | af_callback_keys + sk->sk_family, |
| 2252 | af_family_clock_key_strings[sk->sk_family]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | |
| 2254 | sk->sk_state_change = sock_def_wakeup; |
| 2255 | sk->sk_data_ready = sock_def_readable; |
| 2256 | sk->sk_write_space = sock_def_write_space; |
| 2257 | sk->sk_error_report = sock_def_error_report; |
| 2258 | sk->sk_destruct = sock_def_destruct; |
| 2259 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2260 | sk->sk_frag.page = NULL; |
| 2261 | sk->sk_frag.offset = 0; |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 2262 | sk->sk_peek_off = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 2264 | sk->sk_peer_pid = NULL; |
| 2265 | sk->sk_peer_cred = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | sk->sk_write_pending = 0; |
| 2267 | sk->sk_rcvlowat = 1; |
| 2268 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| 2269 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
| 2270 | |
Eric Dumazet | f37f0af | 2008-04-13 21:39:26 -0700 | [diff] [blame] | 2271 | sk->sk_stamp = ktime_set(-1L, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 2273 | /* |
| 2274 | * Before updating sk_refcnt, we must commit prior changes to memory |
| 2275 | * (Documentation/RCU/rculist_nulls.txt for details) |
| 2276 | */ |
| 2277 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | atomic_set(&sk->sk_refcnt, 1); |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 2279 | atomic_set(&sk->sk_drops, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2280 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2281 | EXPORT_SYMBOL(sock_init_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 2283 | void lock_sock_nested(struct sock *sk, int subclass) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2284 | { |
| 2285 | might_sleep(); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2286 | spin_lock_bh(&sk->sk_lock.slock); |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 2287 | if (sk->sk_lock.owned) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | __lock_sock(sk); |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 2289 | sk->sk_lock.owned = 1; |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2290 | spin_unlock(&sk->sk_lock.slock); |
| 2291 | /* |
| 2292 | * The sk_lock has mutex_lock() semantics here: |
| 2293 | */ |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 2294 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2295 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2296 | } |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 2297 | EXPORT_SYMBOL(lock_sock_nested); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 2299 | void release_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2301 | /* |
| 2302 | * The sk_lock has mutex_unlock() semantics: |
| 2303 | */ |
| 2304 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
| 2305 | |
| 2306 | spin_lock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | if (sk->sk_backlog.tail) |
| 2308 | __release_sock(sk); |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 2309 | |
| 2310 | if (sk->sk_prot->release_cb) |
| 2311 | sk->sk_prot->release_cb(sk); |
| 2312 | |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 2313 | sk->sk_lock.owned = 0; |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2314 | if (waitqueue_active(&sk->sk_lock.wq)) |
| 2315 | wake_up(&sk->sk_lock.wq); |
| 2316 | spin_unlock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | } |
| 2318 | EXPORT_SYMBOL(release_sock); |
| 2319 | |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 2320 | /** |
| 2321 | * lock_sock_fast - fast version of lock_sock |
| 2322 | * @sk: socket |
| 2323 | * |
| 2324 | * This version should be used for very small section, where process wont block |
| 2325 | * return false if fast path is taken |
| 2326 | * sk_lock.slock locked, owned = 0, BH disabled |
| 2327 | * return true if slow path is taken |
| 2328 | * sk_lock.slock unlocked, owned = 1, BH enabled |
| 2329 | */ |
| 2330 | bool lock_sock_fast(struct sock *sk) |
| 2331 | { |
| 2332 | might_sleep(); |
| 2333 | spin_lock_bh(&sk->sk_lock.slock); |
| 2334 | |
| 2335 | if (!sk->sk_lock.owned) |
| 2336 | /* |
| 2337 | * Note : We must disable BH |
| 2338 | */ |
| 2339 | return false; |
| 2340 | |
| 2341 | __lock_sock(sk); |
| 2342 | sk->sk_lock.owned = 1; |
| 2343 | spin_unlock(&sk->sk_lock.slock); |
| 2344 | /* |
| 2345 | * The sk_lock has mutex_lock() semantics here: |
| 2346 | */ |
| 2347 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); |
| 2348 | local_bh_enable(); |
| 2349 | return true; |
| 2350 | } |
| 2351 | EXPORT_SYMBOL(lock_sock_fast); |
| 2352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2353 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2354 | { |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2355 | struct timeval tv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2357 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2358 | tv = ktime_to_timeval(sk->sk_stamp); |
| 2359 | if (tv.tv_sec == -1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2360 | return -ENOENT; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2361 | if (tv.tv_sec == 0) { |
| 2362 | sk->sk_stamp = ktime_get_real(); |
| 2363 | tv = ktime_to_timeval(sk->sk_stamp); |
| 2364 | } |
| 2365 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2366 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2367 | EXPORT_SYMBOL(sock_get_timestamp); |
| 2368 | |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 2369 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
| 2370 | { |
| 2371 | struct timespec ts; |
| 2372 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2373 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 2374 | ts = ktime_to_timespec(sk->sk_stamp); |
| 2375 | if (ts.tv_sec == -1) |
| 2376 | return -ENOENT; |
| 2377 | if (ts.tv_sec == 0) { |
| 2378 | sk->sk_stamp = ktime_get_real(); |
| 2379 | ts = ktime_to_timespec(sk->sk_stamp); |
| 2380 | } |
| 2381 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; |
| 2382 | } |
| 2383 | EXPORT_SYMBOL(sock_get_timestampns); |
| 2384 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2385 | void sock_enable_timestamp(struct sock *sk, int flag) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2386 | { |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2387 | if (!sock_flag(sk, flag)) { |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 2388 | unsigned long previous_flags = sk->sk_flags; |
| 2389 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2390 | sock_set_flag(sk, flag); |
| 2391 | /* |
| 2392 | * we just set one of the two flags which require net |
| 2393 | * time stamping, but time stamping might have been on |
| 2394 | * already because of the other one |
| 2395 | */ |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 2396 | if (!(previous_flags & SK_FLAGS_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2397 | net_enable_timestamp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | } |
| 2399 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2400 | |
| 2401 | /* |
| 2402 | * Get a socket option on an socket. |
| 2403 | * |
| 2404 | * FIX: POSIX 1003.1g is very ambiguous here. It states that |
| 2405 | * asynchronous errors should be reported by getsockopt. We assume |
| 2406 | * this means if you specify SO_ERROR (otherwise whats the point of it). |
| 2407 | */ |
| 2408 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 2409 | char __user *optval, int __user *optlen) |
| 2410 | { |
| 2411 | struct sock *sk = sock->sk; |
| 2412 | |
| 2413 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 2414 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | EXPORT_SYMBOL(sock_common_getsockopt); |
| 2416 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2417 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2418 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 2419 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2420 | { |
| 2421 | struct sock *sk = sock->sk; |
| 2422 | |
Johannes Berg | 1e51f95 | 2007-03-06 13:44:06 -0800 | [diff] [blame] | 2423 | if (sk->sk_prot->compat_getsockopt != NULL) |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2424 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
| 2425 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2426 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 2427 | } |
| 2428 | EXPORT_SYMBOL(compat_sock_common_getsockopt); |
| 2429 | #endif |
| 2430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 2432 | struct msghdr *msg, size_t size, int flags) |
| 2433 | { |
| 2434 | struct sock *sk = sock->sk; |
| 2435 | int addr_len = 0; |
| 2436 | int err; |
| 2437 | |
| 2438 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, |
| 2439 | flags & ~MSG_DONTWAIT, &addr_len); |
| 2440 | if (err >= 0) |
| 2441 | msg->msg_namelen = addr_len; |
| 2442 | return err; |
| 2443 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | EXPORT_SYMBOL(sock_common_recvmsg); |
| 2445 | |
| 2446 | /* |
| 2447 | * Set socket options on an inet socket. |
| 2448 | */ |
| 2449 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2450 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | { |
| 2452 | struct sock *sk = sock->sk; |
| 2453 | |
| 2454 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 2455 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | EXPORT_SYMBOL(sock_common_setsockopt); |
| 2457 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2458 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2459 | 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] | 2460 | char __user *optval, unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2461 | { |
| 2462 | struct sock *sk = sock->sk; |
| 2463 | |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2464 | if (sk->sk_prot->compat_setsockopt != NULL) |
| 2465 | return sk->sk_prot->compat_setsockopt(sk, level, optname, |
| 2466 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2467 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 2468 | } |
| 2469 | EXPORT_SYMBOL(compat_sock_common_setsockopt); |
| 2470 | #endif |
| 2471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2472 | void sk_common_release(struct sock *sk) |
| 2473 | { |
| 2474 | if (sk->sk_prot->destroy) |
| 2475 | sk->sk_prot->destroy(sk); |
| 2476 | |
| 2477 | /* |
| 2478 | * Observation: when sock_common_release is called, processes have |
| 2479 | * no access to socket. But net still has. |
| 2480 | * Step one, detach it from networking: |
| 2481 | * |
| 2482 | * A. Remove from hash tables. |
| 2483 | */ |
| 2484 | |
| 2485 | sk->sk_prot->unhash(sk); |
| 2486 | |
| 2487 | /* |
| 2488 | * In this point socket cannot receive new packets, but it is possible |
| 2489 | * that some packets are in flight because some CPU runs receiver and |
| 2490 | * did hash table lookup before we unhashed socket. They will achieve |
| 2491 | * receive queue and will be purged by socket destructor. |
| 2492 | * |
| 2493 | * Also we still have packets pending on receive queue and probably, |
| 2494 | * our own packets waiting in device queues. sock_destroy will drain |
| 2495 | * receive queue, but transmitted packets will delay socket destruction |
| 2496 | * until the last reference will be released. |
| 2497 | */ |
| 2498 | |
| 2499 | sock_orphan(sk); |
| 2500 | |
| 2501 | xfrm_sk_free_policy(sk); |
| 2502 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 2503 | sk_refcnt_debug_release(sk); |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2504 | |
| 2505 | if (sk->sk_frag.page) { |
| 2506 | put_page(sk->sk_frag.page); |
| 2507 | sk->sk_frag.page = NULL; |
| 2508 | } |
| 2509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2510 | sock_put(sk); |
| 2511 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2512 | EXPORT_SYMBOL(sk_common_release); |
| 2513 | |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2514 | #ifdef CONFIG_PROC_FS |
| 2515 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2516 | struct prot_inuse { |
| 2517 | int val[PROTO_INUSE_NR]; |
| 2518 | }; |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2519 | |
| 2520 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2521 | |
| 2522 | #ifdef CONFIG_NET_NS |
| 2523 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
| 2524 | { |
Eric Dumazet | d6d9ca0 | 2010-07-19 10:48:49 +0000 | [diff] [blame] | 2525 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2526 | } |
| 2527 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| 2528 | |
| 2529 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
| 2530 | { |
| 2531 | int cpu, idx = prot->inuse_idx; |
| 2532 | int res = 0; |
| 2533 | |
| 2534 | for_each_possible_cpu(cpu) |
| 2535 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; |
| 2536 | |
| 2537 | return res >= 0 ? res : 0; |
| 2538 | } |
| 2539 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
| 2540 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2541 | static int __net_init sock_inuse_init_net(struct net *net) |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2542 | { |
| 2543 | net->core.inuse = alloc_percpu(struct prot_inuse); |
| 2544 | return net->core.inuse ? 0 : -ENOMEM; |
| 2545 | } |
| 2546 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2547 | static void __net_exit sock_inuse_exit_net(struct net *net) |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2548 | { |
| 2549 | free_percpu(net->core.inuse); |
| 2550 | } |
| 2551 | |
| 2552 | static struct pernet_operations net_inuse_ops = { |
| 2553 | .init = sock_inuse_init_net, |
| 2554 | .exit = sock_inuse_exit_net, |
| 2555 | }; |
| 2556 | |
| 2557 | static __init int net_inuse_init(void) |
| 2558 | { |
| 2559 | if (register_pernet_subsys(&net_inuse_ops)) |
| 2560 | panic("Cannot initialize net inuse counters"); |
| 2561 | |
| 2562 | return 0; |
| 2563 | } |
| 2564 | |
| 2565 | core_initcall(net_inuse_init); |
| 2566 | #else |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2567 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
| 2568 | |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 2569 | 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] | 2570 | { |
Eric Dumazet | d6d9ca0 | 2010-07-19 10:48:49 +0000 | [diff] [blame] | 2571 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2572 | } |
| 2573 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| 2574 | |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 2575 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2576 | { |
| 2577 | int cpu, idx = prot->inuse_idx; |
| 2578 | int res = 0; |
| 2579 | |
| 2580 | for_each_possible_cpu(cpu) |
| 2581 | res += per_cpu(prot_inuse, cpu).val[idx]; |
| 2582 | |
| 2583 | return res >= 0 ? res : 0; |
| 2584 | } |
| 2585 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2586 | #endif |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2587 | |
| 2588 | static void assign_proto_idx(struct proto *prot) |
| 2589 | { |
| 2590 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); |
| 2591 | |
| 2592 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 2593 | pr_err("PROTO_INUSE_NR exhausted\n"); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2594 | return; |
| 2595 | } |
| 2596 | |
| 2597 | set_bit(prot->inuse_idx, proto_inuse_idx); |
| 2598 | } |
| 2599 | |
| 2600 | static void release_proto_idx(struct proto *prot) |
| 2601 | { |
| 2602 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) |
| 2603 | clear_bit(prot->inuse_idx, proto_inuse_idx); |
| 2604 | } |
| 2605 | #else |
| 2606 | static inline void assign_proto_idx(struct proto *prot) |
| 2607 | { |
| 2608 | } |
| 2609 | |
| 2610 | static inline void release_proto_idx(struct proto *prot) |
| 2611 | { |
| 2612 | } |
| 2613 | #endif |
| 2614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | int proto_register(struct proto *prot, int alloc_slab) |
| 2616 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2617 | if (alloc_slab) { |
| 2618 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 2619 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
| 2620 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2621 | |
| 2622 | if (prot->slab == NULL) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 2623 | pr_crit("%s: Can't create sock SLAB cache!\n", |
| 2624 | prot->name); |
Pavel Emelyanov | 60e7663 | 2008-03-28 16:39:10 -0700 | [diff] [blame] | 2625 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2626 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2627 | |
| 2628 | if (prot->rsk_prot != NULL) { |
Alexey Dobriyan | faf2342 | 2010-02-17 09:34:12 +0000 | [diff] [blame] | 2629 | 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] | 2630 | if (prot->rsk_prot->slab_name == NULL) |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2631 | goto out_free_sock_slab; |
| 2632 | |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2633 | 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] | 2634 | prot->rsk_prot->obj_size, 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2635 | SLAB_HWCACHE_ALIGN, NULL); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2636 | |
| 2637 | if (prot->rsk_prot->slab == NULL) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 2638 | pr_crit("%s: Can't create request sock SLAB cache!\n", |
| 2639 | prot->name); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2640 | goto out_free_request_sock_slab_name; |
| 2641 | } |
| 2642 | } |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2643 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2644 | if (prot->twsk_prot != NULL) { |
Alexey Dobriyan | faf2342 | 2010-02-17 09:34:12 +0000 | [diff] [blame] | 2645 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2646 | |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2647 | if (prot->twsk_prot->twsk_slab_name == NULL) |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2648 | goto out_free_request_sock_slab; |
| 2649 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2650 | prot->twsk_prot->twsk_slab = |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2651 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2652 | prot->twsk_prot->twsk_obj_size, |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2653 | 0, |
| 2654 | SLAB_HWCACHE_ALIGN | |
| 2655 | prot->slab_flags, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2656 | NULL); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2657 | if (prot->twsk_prot->twsk_slab == NULL) |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2658 | goto out_free_timewait_sock_slab_name; |
| 2659 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2660 | } |
| 2661 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2662 | mutex_lock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2663 | list_add(&prot->node, &proto_list); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2664 | assign_proto_idx(prot); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2665 | mutex_unlock(&proto_list_mutex); |
Pavel Emelyanov | b733c00 | 2007-11-07 02:23:38 -0800 | [diff] [blame] | 2666 | return 0; |
| 2667 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2668 | out_free_timewait_sock_slab_name: |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2669 | kfree(prot->twsk_prot->twsk_slab_name); |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2670 | out_free_request_sock_slab: |
| 2671 | if (prot->rsk_prot && prot->rsk_prot->slab) { |
| 2672 | kmem_cache_destroy(prot->rsk_prot->slab); |
| 2673 | prot->rsk_prot->slab = NULL; |
| 2674 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2675 | out_free_request_sock_slab_name: |
Dan Carpenter | 72150e9 | 2010-03-06 01:04:45 +0000 | [diff] [blame] | 2676 | if (prot->rsk_prot) |
| 2677 | kfree(prot->rsk_prot->slab_name); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2678 | out_free_sock_slab: |
| 2679 | kmem_cache_destroy(prot->slab); |
| 2680 | prot->slab = NULL; |
Pavel Emelyanov | b733c00 | 2007-11-07 02:23:38 -0800 | [diff] [blame] | 2681 | out: |
| 2682 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2683 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2684 | EXPORT_SYMBOL(proto_register); |
| 2685 | |
| 2686 | void proto_unregister(struct proto *prot) |
| 2687 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2688 | mutex_lock(&proto_list_mutex); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2689 | release_proto_idx(prot); |
Patrick McHardy | 0a3f435 | 2005-09-06 19:47:50 -0700 | [diff] [blame] | 2690 | list_del(&prot->node); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2691 | mutex_unlock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2692 | |
| 2693 | if (prot->slab != NULL) { |
| 2694 | kmem_cache_destroy(prot->slab); |
| 2695 | prot->slab = NULL; |
| 2696 | } |
| 2697 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2698 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2699 | kmem_cache_destroy(prot->rsk_prot->slab); |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2700 | kfree(prot->rsk_prot->slab_name); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2701 | prot->rsk_prot->slab = NULL; |
| 2702 | } |
| 2703 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2704 | 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] | 2705 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2706 | kfree(prot->twsk_prot->twsk_slab_name); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2707 | prot->twsk_prot->twsk_slab = NULL; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2708 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2709 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2710 | EXPORT_SYMBOL(proto_unregister); |
| 2711 | |
| 2712 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2713 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2714 | __acquires(proto_list_mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2715 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2716 | mutex_lock(&proto_list_mutex); |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2717 | return seq_list_start_head(&proto_list, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2718 | } |
| 2719 | |
| 2720 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2721 | { |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2722 | return seq_list_next(v, &proto_list, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2723 | } |
| 2724 | |
| 2725 | static void proto_seq_stop(struct seq_file *seq, void *v) |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2726 | __releases(proto_list_mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2727 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2728 | mutex_unlock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2729 | } |
| 2730 | |
| 2731 | static char proto_method_implemented(const void *method) |
| 2732 | { |
| 2733 | return method == NULL ? 'n' : 'y'; |
| 2734 | } |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2735 | static long sock_prot_memory_allocated(struct proto *proto) |
| 2736 | { |
Jeffrin Jose | cb75a36 | 2012-04-25 19:17:29 +0530 | [diff] [blame] | 2737 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2738 | } |
| 2739 | |
| 2740 | static char *sock_prot_memory_pressure(struct proto *proto) |
| 2741 | { |
| 2742 | return proto->memory_pressure != NULL ? |
| 2743 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; |
| 2744 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2745 | |
| 2746 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) |
| 2747 | { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2748 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 2749 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2750 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
| 2751 | proto->name, |
| 2752 | proto->obj_size, |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2753 | sock_prot_inuse_get(seq_file_net(seq), proto), |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2754 | sock_prot_memory_allocated(proto), |
| 2755 | sock_prot_memory_pressure(proto), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2756 | proto->max_header, |
| 2757 | proto->slab == NULL ? "no" : "yes", |
| 2758 | module_name(proto->owner), |
| 2759 | proto_method_implemented(proto->close), |
| 2760 | proto_method_implemented(proto->connect), |
| 2761 | proto_method_implemented(proto->disconnect), |
| 2762 | proto_method_implemented(proto->accept), |
| 2763 | proto_method_implemented(proto->ioctl), |
| 2764 | proto_method_implemented(proto->init), |
| 2765 | proto_method_implemented(proto->destroy), |
| 2766 | proto_method_implemented(proto->shutdown), |
| 2767 | proto_method_implemented(proto->setsockopt), |
| 2768 | proto_method_implemented(proto->getsockopt), |
| 2769 | proto_method_implemented(proto->sendmsg), |
| 2770 | proto_method_implemented(proto->recvmsg), |
| 2771 | proto_method_implemented(proto->sendpage), |
| 2772 | proto_method_implemented(proto->bind), |
| 2773 | proto_method_implemented(proto->backlog_rcv), |
| 2774 | proto_method_implemented(proto->hash), |
| 2775 | proto_method_implemented(proto->unhash), |
| 2776 | proto_method_implemented(proto->get_port), |
| 2777 | proto_method_implemented(proto->enter_memory_pressure)); |
| 2778 | } |
| 2779 | |
| 2780 | static int proto_seq_show(struct seq_file *seq, void *v) |
| 2781 | { |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2782 | if (v == &proto_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2783 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
| 2784 | "protocol", |
| 2785 | "size", |
| 2786 | "sockets", |
| 2787 | "memory", |
| 2788 | "press", |
| 2789 | "maxhdr", |
| 2790 | "slab", |
| 2791 | "module", |
| 2792 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); |
| 2793 | else |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2794 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2795 | return 0; |
| 2796 | } |
| 2797 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 2798 | static const struct seq_operations proto_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2799 | .start = proto_seq_start, |
| 2800 | .next = proto_seq_next, |
| 2801 | .stop = proto_seq_stop, |
| 2802 | .show = proto_seq_show, |
| 2803 | }; |
| 2804 | |
| 2805 | static int proto_seq_open(struct inode *inode, struct file *file) |
| 2806 | { |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2807 | return seq_open_net(inode, file, &proto_seq_ops, |
| 2808 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2809 | } |
| 2810 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 2811 | static const struct file_operations proto_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2812 | .owner = THIS_MODULE, |
| 2813 | .open = proto_seq_open, |
| 2814 | .read = seq_read, |
| 2815 | .llseek = seq_lseek, |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2816 | .release = seq_release_net, |
| 2817 | }; |
| 2818 | |
| 2819 | static __net_init int proto_init_net(struct net *net) |
| 2820 | { |
| 2821 | if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) |
| 2822 | return -ENOMEM; |
| 2823 | |
| 2824 | return 0; |
| 2825 | } |
| 2826 | |
| 2827 | static __net_exit void proto_exit_net(struct net *net) |
| 2828 | { |
| 2829 | proc_net_remove(net, "protocols"); |
| 2830 | } |
| 2831 | |
| 2832 | |
| 2833 | static __net_initdata struct pernet_operations proto_net_ops = { |
| 2834 | .init = proto_init_net, |
| 2835 | .exit = proto_exit_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2836 | }; |
| 2837 | |
| 2838 | static int __init proto_init(void) |
| 2839 | { |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2840 | return register_pernet_subsys(&proto_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2841 | } |
| 2842 | |
| 2843 | subsys_initcall(proto_init); |
| 2844 | |
| 2845 | #endif /* PROC_FS */ |