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> |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 96 | #include <linux/errqueue.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | #include <linux/types.h> |
| 98 | #include <linux/socket.h> |
| 99 | #include <linux/in.h> |
| 100 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | #include <linux/module.h> |
| 102 | #include <linux/proc_fs.h> |
| 103 | #include <linux/seq_file.h> |
| 104 | #include <linux/sched.h> |
| 105 | #include <linux/timer.h> |
| 106 | #include <linux/string.h> |
| 107 | #include <linux/sockios.h> |
| 108 | #include <linux/net.h> |
| 109 | #include <linux/mm.h> |
| 110 | #include <linux/slab.h> |
| 111 | #include <linux/interrupt.h> |
| 112 | #include <linux/poll.h> |
| 113 | #include <linux/tcp.h> |
| 114 | #include <linux/init.h> |
Al Viro | a1f8e7f7 | 2006-10-19 16:08:53 -0400 | [diff] [blame] | 115 | #include <linux/highmem.h> |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 116 | #include <linux/user_namespace.h> |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 117 | #include <linux/static_key.h> |
David S. Miller | 3969eb3 | 2012-01-09 13:44:23 -0800 | [diff] [blame] | 118 | #include <linux/memcontrol.h> |
David S. Miller | 8c1ae10 | 2012-05-03 02:25:55 -0400 | [diff] [blame] | 119 | #include <linux/prefetch.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
| 123 | #include <linux/netdevice.h> |
| 124 | #include <net/protocol.h> |
| 125 | #include <linux/skbuff.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 126 | #include <net/net_namespace.h> |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 127 | #include <net/request_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | #include <net/sock.h> |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 129 | #include <linux/net_tstamp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | #include <net/xfrm.h> |
| 131 | #include <linux/ipsec.h> |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 132 | #include <net/cls_cgroup.h> |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 133 | #include <net/netprio_cgroup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | #include <linux/filter.h> |
| 136 | |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 137 | #include <trace/events/sock.h> |
| 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | #ifdef CONFIG_INET |
| 140 | #include <net/tcp.h> |
| 141 | #endif |
| 142 | |
Eliezer Tamir | 076bb0c | 2013-07-10 17:13:17 +0300 | [diff] [blame] | 143 | #include <net/busy_poll.h> |
Eliezer Tamir | 0602129 | 2013-06-10 11:39:50 +0300 | [diff] [blame] | 144 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 145 | static DEFINE_MUTEX(proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 146 | static LIST_HEAD(proto_list); |
| 147 | |
Eric W. Biederman | a3b299d | 2014-04-23 14:26:56 -0700 | [diff] [blame] | 148 | /** |
| 149 | * sk_ns_capable - General socket capability test |
| 150 | * @sk: Socket to use a capability on or through |
| 151 | * @user_ns: The user namespace of the capability to use |
| 152 | * @cap: The capability to use |
| 153 | * |
| 154 | * Test to see if the opener of the socket had when the socket was |
| 155 | * created and the current process has the capability @cap in the user |
| 156 | * namespace @user_ns. |
| 157 | */ |
| 158 | bool sk_ns_capable(const struct sock *sk, |
| 159 | struct user_namespace *user_ns, int cap) |
| 160 | { |
| 161 | return file_ns_capable(sk->sk_socket->file, user_ns, cap) && |
| 162 | ns_capable(user_ns, cap); |
| 163 | } |
| 164 | EXPORT_SYMBOL(sk_ns_capable); |
| 165 | |
| 166 | /** |
| 167 | * sk_capable - Socket global capability test |
| 168 | * @sk: Socket to use a capability on or through |
Masanari Iida | e793c0f | 2014-09-04 23:44:36 +0900 | [diff] [blame] | 169 | * @cap: The global capability to use |
Eric W. Biederman | a3b299d | 2014-04-23 14:26:56 -0700 | [diff] [blame] | 170 | * |
| 171 | * Test to see if the opener of the socket had when the socket was |
| 172 | * created and the current process has the capability @cap in all user |
| 173 | * namespaces. |
| 174 | */ |
| 175 | bool sk_capable(const struct sock *sk, int cap) |
| 176 | { |
| 177 | return sk_ns_capable(sk, &init_user_ns, cap); |
| 178 | } |
| 179 | EXPORT_SYMBOL(sk_capable); |
| 180 | |
| 181 | /** |
| 182 | * sk_net_capable - Network namespace socket capability test |
| 183 | * @sk: Socket to use a capability on or through |
| 184 | * @cap: The capability to use |
| 185 | * |
Masanari Iida | e793c0f | 2014-09-04 23:44:36 +0900 | [diff] [blame] | 186 | * Test to see if the opener of the socket had when the socket was created |
Eric W. Biederman | a3b299d | 2014-04-23 14:26:56 -0700 | [diff] [blame] | 187 | * and the current process has the capability @cap over the network namespace |
| 188 | * the socket is a member of. |
| 189 | */ |
| 190 | bool sk_net_capable(const struct sock *sk, int cap) |
| 191 | { |
| 192 | return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); |
| 193 | } |
| 194 | EXPORT_SYMBOL(sk_net_capable); |
| 195 | |
| 196 | |
Andrew Morton | c255a45 | 2012-07-31 16:43:02 -0700 | [diff] [blame] | 197 | #ifdef CONFIG_MEMCG_KMEM |
Glauber Costa | 1d62e43 | 2012-04-09 19:36:33 -0300 | [diff] [blame] | 198 | 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] | 199 | { |
| 200 | struct proto *proto; |
| 201 | int ret = 0; |
| 202 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 203 | mutex_lock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 204 | list_for_each_entry(proto, &proto_list, node) { |
| 205 | if (proto->init_cgroup) { |
Glauber Costa | 1d62e43 | 2012-04-09 19:36:33 -0300 | [diff] [blame] | 206 | ret = proto->init_cgroup(memcg, ss); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 207 | if (ret) |
| 208 | goto out; |
| 209 | } |
| 210 | } |
| 211 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 212 | mutex_unlock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 213 | return ret; |
| 214 | out: |
| 215 | list_for_each_entry_continue_reverse(proto, &proto_list, node) |
| 216 | if (proto->destroy_cgroup) |
Glauber Costa | 1d62e43 | 2012-04-09 19:36:33 -0300 | [diff] [blame] | 217 | proto->destroy_cgroup(memcg); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 218 | mutex_unlock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 219 | return ret; |
| 220 | } |
| 221 | |
Glauber Costa | 1d62e43 | 2012-04-09 19:36:33 -0300 | [diff] [blame] | 222 | void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 223 | { |
| 224 | struct proto *proto; |
| 225 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 226 | mutex_lock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 227 | list_for_each_entry_reverse(proto, &proto_list, node) |
| 228 | if (proto->destroy_cgroup) |
Glauber Costa | 1d62e43 | 2012-04-09 19:36:33 -0300 | [diff] [blame] | 229 | proto->destroy_cgroup(memcg); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 230 | mutex_unlock(&proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 231 | } |
| 232 | #endif |
| 233 | |
Ingo Molnar | da21f24 | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 234 | /* |
| 235 | * Each address family might have different locking rules, so we have |
| 236 | * one slock key per address family: |
| 237 | */ |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 238 | static struct lock_class_key af_family_keys[AF_MAX]; |
| 239 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
| 240 | |
stephen hemminger | cbda4ea | 2013-02-22 07:59:10 +0000 | [diff] [blame] | 241 | #if defined(CONFIG_MEMCG_KMEM) |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 242 | struct static_key memcg_socket_limit_enabled; |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 243 | EXPORT_SYMBOL(memcg_socket_limit_enabled); |
stephen hemminger | cbda4ea | 2013-02-22 07:59:10 +0000 | [diff] [blame] | 244 | #endif |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 245 | |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 246 | /* |
| 247 | * Make lock validator output more readable. (we pre-construct these |
| 248 | * strings build-time, so that runtime initialization of socket |
| 249 | * locks is fast): |
| 250 | */ |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 251 | static const char *const af_family_key_strings[AF_MAX+1] = { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 252 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
| 253 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", |
| 254 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , |
| 255 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , |
| 256 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , |
| 257 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , |
| 258 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 259 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 260 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
Oliver Hartkopp | cd05acf | 2007-12-16 15:59:24 -0800 | [diff] [blame] | 261 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 262 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 263 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 264 | "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
Federico Vaga | 456db6a | 2013-05-28 05:02:44 +0000 | [diff] [blame] | 265 | "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX" |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 266 | }; |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 267 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 268 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
| 269 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", |
| 270 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , |
| 271 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , |
| 272 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , |
| 273 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , |
| 274 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 275 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 276 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
Oliver Hartkopp | cd05acf | 2007-12-16 15:59:24 -0800 | [diff] [blame] | 277 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 278 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 279 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 280 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
Federico Vaga | 456db6a | 2013-05-28 05:02:44 +0000 | [diff] [blame] | 281 | "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX" |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 282 | }; |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 283 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 284 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
| 285 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", |
| 286 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , |
| 287 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , |
| 288 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , |
| 289 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , |
| 290 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 291 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 292 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
Oliver Hartkopp | b4942af | 2008-07-23 14:06:04 -0700 | [diff] [blame] | 293 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
David Howells | e51f802 | 2007-07-21 19:30:16 -0700 | [diff] [blame] | 294 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 295 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 296 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
Federico Vaga | 456db6a | 2013-05-28 05:02:44 +0000 | [diff] [blame] | 297 | "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX" |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 298 | }; |
Ingo Molnar | da21f24 | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 299 | |
| 300 | /* |
| 301 | * sk_callback_lock locking rules are per-address-family, |
| 302 | * so split the lock classes by using a per-AF key: |
| 303 | */ |
| 304 | static struct lock_class_key af_callback_keys[AF_MAX]; |
| 305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | /* Take into consideration the size of the struct sk_buff overhead in the |
| 307 | * determination of these values, since that is non-constant across |
| 308 | * platforms. This makes socket queueing behavior and performance |
| 309 | * not depend upon such differences. |
| 310 | */ |
| 311 | #define _SK_MEM_PACKETS 256 |
Eric Dumazet | 87fb4b7 | 2011-10-13 07:28:54 +0000 | [diff] [blame] | 312 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 314 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 315 | |
| 316 | /* Run time adjustable parameters. */ |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 317 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
Hans Schillstrom | 6d8ebc8 | 2012-04-30 08:13:50 +0200 | [diff] [blame] | 318 | EXPORT_SYMBOL(sysctl_wmem_max); |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 319 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
Hans Schillstrom | 6d8ebc8 | 2012-04-30 08:13:50 +0200 | [diff] [blame] | 320 | EXPORT_SYMBOL(sysctl_rmem_max); |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 321 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
| 322 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 324 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 325 | 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] | 326 | EXPORT_SYMBOL(sysctl_optmem_max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | |
Willem de Bruijn | b245be1 | 2015-01-30 13:29:32 -0500 | [diff] [blame] | 328 | int sysctl_tstamp_allow_data __read_mostly = 1; |
| 329 | |
Mel Gorman | c93bdd0 | 2012-07-31 16:44:19 -0700 | [diff] [blame] | 330 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
| 331 | EXPORT_SYMBOL_GPL(memalloc_socks); |
| 332 | |
Mel Gorman | 7cb0240 | 2012-07-31 16:44:16 -0700 | [diff] [blame] | 333 | /** |
| 334 | * sk_set_memalloc - sets %SOCK_MEMALLOC |
| 335 | * @sk: socket to set it on |
| 336 | * |
| 337 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. |
| 338 | * It's the responsibility of the admin to adjust min_free_kbytes |
| 339 | * to meet the requirements |
| 340 | */ |
| 341 | void sk_set_memalloc(struct sock *sk) |
| 342 | { |
| 343 | sock_set_flag(sk, SOCK_MEMALLOC); |
| 344 | sk->sk_allocation |= __GFP_MEMALLOC; |
Mel Gorman | c93bdd0 | 2012-07-31 16:44:19 -0700 | [diff] [blame] | 345 | static_key_slow_inc(&memalloc_socks); |
Mel Gorman | 7cb0240 | 2012-07-31 16:44:16 -0700 | [diff] [blame] | 346 | } |
| 347 | EXPORT_SYMBOL_GPL(sk_set_memalloc); |
| 348 | |
| 349 | void sk_clear_memalloc(struct sock *sk) |
| 350 | { |
| 351 | sock_reset_flag(sk, SOCK_MEMALLOC); |
| 352 | sk->sk_allocation &= ~__GFP_MEMALLOC; |
Mel Gorman | c93bdd0 | 2012-07-31 16:44:19 -0700 | [diff] [blame] | 353 | static_key_slow_dec(&memalloc_socks); |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 354 | |
| 355 | /* |
| 356 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward |
| 357 | * progress of swapping. However, if SOCK_MEMALLOC is cleared while |
| 358 | * it has rmem allocations there is a risk that the user of the |
| 359 | * socket cannot make forward progress due to exceeding the rmem |
| 360 | * limits. By rights, sk_clear_memalloc() should only be called |
| 361 | * on sockets being torn down but warn and reset the accounting if |
| 362 | * that assumption breaks. |
| 363 | */ |
| 364 | if (WARN_ON(sk->sk_forward_alloc)) |
| 365 | sk_mem_reclaim(sk); |
Mel Gorman | 7cb0240 | 2012-07-31 16:44:16 -0700 | [diff] [blame] | 366 | } |
| 367 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); |
| 368 | |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 369 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
| 370 | { |
| 371 | int ret; |
| 372 | unsigned long pflags = current->flags; |
| 373 | |
| 374 | /* these should have been dropped before queueing */ |
| 375 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); |
| 376 | |
| 377 | current->flags |= PF_MEMALLOC; |
| 378 | ret = sk->sk_backlog_rcv(sk, skb); |
| 379 | tsk_restore_flags(current, pflags, PF_MEMALLOC); |
| 380 | |
| 381 | return ret; |
| 382 | } |
| 383 | EXPORT_SYMBOL(__sk_backlog_rcv); |
| 384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
| 386 | { |
| 387 | struct timeval tv; |
| 388 | |
| 389 | if (optlen < sizeof(tv)) |
| 390 | return -EINVAL; |
| 391 | if (copy_from_user(&tv, optval, sizeof(tv))) |
| 392 | return -EFAULT; |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 393 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
| 394 | return -EDOM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 396 | if (tv.tv_sec < 0) { |
Andrew Morton | 6f11df8 | 2007-07-09 13:16:00 -0700 | [diff] [blame] | 397 | static int warned __read_mostly; |
| 398 | |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 399 | *timeo_p = 0; |
Ilpo Järvinen | 50aab54 | 2008-05-02 16:20:10 -0700 | [diff] [blame] | 400 | if (warned < 10 && net_ratelimit()) { |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 401 | warned++; |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 402 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
| 403 | __func__, current->comm, task_pid_nr(current)); |
Ilpo Järvinen | 50aab54 | 2008-05-02 16:20:10 -0700 | [diff] [blame] | 404 | } |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 405 | return 0; |
| 406 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
| 408 | if (tv.tv_sec == 0 && tv.tv_usec == 0) |
| 409 | return 0; |
| 410 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) |
| 411 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | static void sock_warn_obsolete_bsdism(const char *name) |
| 416 | { |
| 417 | static int warned; |
| 418 | static char warncomm[TASK_COMM_LEN]; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 419 | if (strcmp(warncomm, current->comm) && warned < 5) { |
| 420 | strcpy(warncomm, current->comm); |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 421 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
| 422 | warncomm, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | warned++; |
| 424 | } |
| 425 | } |
| 426 | |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 427 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
| 428 | |
| 429 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 430 | { |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 431 | if (sk->sk_flags & flags) { |
| 432 | sk->sk_flags &= ~flags; |
| 433 | if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 434 | net_disable_timestamp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | } |
| 436 | } |
| 437 | |
| 438 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 439 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 440 | { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 441 | int err; |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 442 | unsigned long flags; |
| 443 | struct sk_buff_head *list = &sk->sk_receive_queue; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 444 | |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 445 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 446 | atomic_inc(&sk->sk_drops); |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 447 | trace_sock_rcvqueue_full(sk, skb); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 448 | return -ENOMEM; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 449 | } |
| 450 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 451 | err = sk_filter(sk, skb); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 452 | if (err) |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 453 | return err; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 454 | |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 455 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 456 | atomic_inc(&sk->sk_drops); |
| 457 | return -ENOBUFS; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 458 | } |
| 459 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 460 | skb->dev = NULL; |
| 461 | skb_set_owner_r(skb, sk); |
David S. Miller | 49ad959 | 2008-12-17 22:11:38 -0800 | [diff] [blame] | 462 | |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 463 | /* we escape from rcu protected region, make sure we dont leak |
| 464 | * a norefcounted dst |
| 465 | */ |
| 466 | skb_dst_force(skb); |
| 467 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 468 | spin_lock_irqsave(&list->lock, flags); |
Eyal Birger | 3bc3b96 | 2015-03-01 14:58:30 +0200 | [diff] [blame] | 469 | sock_skb_set_dropcount(sk, skb); |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 470 | __skb_queue_tail(list, skb); |
| 471 | spin_unlock_irqrestore(&list->lock, flags); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 472 | |
| 473 | if (!sock_flag(sk, SOCK_DEAD)) |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 474 | sk->sk_data_ready(sk); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 475 | return 0; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 476 | } |
| 477 | EXPORT_SYMBOL(sock_queue_rcv_skb); |
| 478 | |
Arnaldo Carvalho de Melo | 58a5a7b | 2006-11-16 14:06:06 -0200 | [diff] [blame] | 479 | 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] | 480 | { |
| 481 | int rc = NET_RX_SUCCESS; |
| 482 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 483 | if (sk_filter(sk, skb)) |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 484 | goto discard_and_relse; |
| 485 | |
| 486 | skb->dev = NULL; |
| 487 | |
Sorin Dumitru | 274f482 | 2014-07-22 21:16:51 +0300 | [diff] [blame] | 488 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 489 | atomic_inc(&sk->sk_drops); |
| 490 | goto discard_and_relse; |
| 491 | } |
Arnaldo Carvalho de Melo | 58a5a7b | 2006-11-16 14:06:06 -0200 | [diff] [blame] | 492 | if (nested) |
| 493 | bh_lock_sock_nested(sk); |
| 494 | else |
| 495 | bh_lock_sock(sk); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 496 | if (!sock_owned_by_user(sk)) { |
| 497 | /* |
| 498 | * trylock + unlock semantics: |
| 499 | */ |
| 500 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); |
| 501 | |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 502 | rc = sk_backlog_rcv(sk, skb); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 503 | |
| 504 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
Eric Dumazet | f545a38 | 2012-04-22 23:34:26 +0000 | [diff] [blame] | 505 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 506 | bh_unlock_sock(sk); |
| 507 | atomic_inc(&sk->sk_drops); |
| 508 | goto discard_and_relse; |
| 509 | } |
| 510 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 511 | bh_unlock_sock(sk); |
| 512 | out: |
| 513 | sock_put(sk); |
| 514 | return rc; |
| 515 | discard_and_relse: |
| 516 | kfree_skb(skb); |
| 517 | goto out; |
| 518 | } |
| 519 | EXPORT_SYMBOL(sk_receive_skb); |
| 520 | |
| 521 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
| 522 | { |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 523 | struct dst_entry *dst = __sk_dst_get(sk); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 524 | |
| 525 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 526 | sk_tx_queue_clear(sk); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 527 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 528 | dst_release(dst); |
| 529 | return NULL; |
| 530 | } |
| 531 | |
| 532 | return dst; |
| 533 | } |
| 534 | EXPORT_SYMBOL(__sk_dst_check); |
| 535 | |
| 536 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) |
| 537 | { |
| 538 | struct dst_entry *dst = sk_dst_get(sk); |
| 539 | |
| 540 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
| 541 | sk_dst_reset(sk); |
| 542 | dst_release(dst); |
| 543 | return NULL; |
| 544 | } |
| 545 | |
| 546 | return dst; |
| 547 | } |
| 548 | EXPORT_SYMBOL(sk_dst_check); |
| 549 | |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 550 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
| 551 | int optlen) |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 552 | { |
| 553 | int ret = -ENOPROTOOPT; |
| 554 | #ifdef CONFIG_NETDEVICES |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 555 | struct net *net = sock_net(sk); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 556 | char devname[IFNAMSIZ]; |
| 557 | int index; |
| 558 | |
| 559 | /* Sorry... */ |
| 560 | ret = -EPERM; |
Eric W. Biederman | 5e1fccc | 2012-11-16 03:03:04 +0000 | [diff] [blame] | 561 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 562 | goto out; |
| 563 | |
| 564 | ret = -EINVAL; |
| 565 | if (optlen < 0) |
| 566 | goto out; |
| 567 | |
| 568 | /* Bind this socket to a particular device like "eth0", |
| 569 | * as specified in the passed interface name. If the |
| 570 | * name is "" or the option length is zero the socket |
| 571 | * is not bound. |
| 572 | */ |
| 573 | if (optlen > IFNAMSIZ - 1) |
| 574 | optlen = IFNAMSIZ - 1; |
| 575 | memset(devname, 0, sizeof(devname)); |
| 576 | |
| 577 | ret = -EFAULT; |
| 578 | if (copy_from_user(devname, optval, optlen)) |
| 579 | goto out; |
| 580 | |
David S. Miller | 000ba2e | 2009-11-05 22:37:11 -0800 | [diff] [blame] | 581 | index = 0; |
| 582 | if (devname[0] != '\0') { |
Eric Dumazet | bf8e56b | 2009-11-05 21:03:39 -0800 | [diff] [blame] | 583 | struct net_device *dev; |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 584 | |
Eric Dumazet | bf8e56b | 2009-11-05 21:03:39 -0800 | [diff] [blame] | 585 | rcu_read_lock(); |
| 586 | dev = dev_get_by_name_rcu(net, devname); |
| 587 | if (dev) |
| 588 | index = dev->ifindex; |
| 589 | rcu_read_unlock(); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 590 | ret = -ENODEV; |
| 591 | if (!dev) |
| 592 | goto out; |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 593 | } |
| 594 | |
| 595 | lock_sock(sk); |
| 596 | sk->sk_bound_dev_if = index; |
| 597 | sk_dst_reset(sk); |
| 598 | release_sock(sk); |
| 599 | |
| 600 | ret = 0; |
| 601 | |
| 602 | out: |
| 603 | #endif |
| 604 | |
| 605 | return ret; |
| 606 | } |
| 607 | |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 608 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
| 609 | int __user *optlen, int len) |
| 610 | { |
| 611 | int ret = -ENOPROTOOPT; |
| 612 | #ifdef CONFIG_NETDEVICES |
| 613 | struct net *net = sock_net(sk); |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 614 | char devname[IFNAMSIZ]; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 615 | |
| 616 | if (sk->sk_bound_dev_if == 0) { |
| 617 | len = 0; |
| 618 | goto zero; |
| 619 | } |
| 620 | |
| 621 | ret = -EINVAL; |
| 622 | if (len < IFNAMSIZ) |
| 623 | goto out; |
| 624 | |
Nicolas Schichan | 5dbe7c1 | 2013-06-26 17:23:42 +0200 | [diff] [blame] | 625 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
| 626 | if (ret) |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 627 | goto out; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 628 | |
| 629 | len = strlen(devname) + 1; |
| 630 | |
| 631 | ret = -EFAULT; |
| 632 | if (copy_to_user(optval, devname, len)) |
| 633 | goto out; |
| 634 | |
| 635 | zero: |
| 636 | ret = -EFAULT; |
| 637 | if (put_user(len, optlen)) |
| 638 | goto out; |
| 639 | |
| 640 | ret = 0; |
| 641 | |
| 642 | out: |
| 643 | #endif |
| 644 | |
| 645 | return ret; |
| 646 | } |
| 647 | |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 648 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
| 649 | { |
| 650 | if (valbool) |
| 651 | sock_set_flag(sk, bit); |
| 652 | else |
| 653 | sock_reset_flag(sk, bit); |
| 654 | } |
| 655 | |
hannes@stressinduktion.org | f60e599 | 2015-04-01 17:07:44 +0200 | [diff] [blame] | 656 | bool sk_mc_loop(struct sock *sk) |
| 657 | { |
| 658 | if (dev_recursion_level()) |
| 659 | return false; |
| 660 | if (!sk) |
| 661 | return true; |
| 662 | switch (sk->sk_family) { |
| 663 | case AF_INET: |
| 664 | return inet_sk(sk)->mc_loop; |
| 665 | #if IS_ENABLED(CONFIG_IPV6) |
| 666 | case AF_INET6: |
| 667 | return inet6_sk(sk)->mc_loop; |
| 668 | #endif |
| 669 | } |
| 670 | WARN_ON(1); |
| 671 | return true; |
| 672 | } |
| 673 | EXPORT_SYMBOL(sk_mc_loop); |
| 674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | /* |
| 676 | * This is meant for all protocols to use and covers goings on |
| 677 | * at the socket level. Everything here is generic. |
| 678 | */ |
| 679 | |
| 680 | int sock_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 681 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | { |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 683 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | int val; |
| 685 | int valbool; |
| 686 | struct linger ling; |
| 687 | int ret = 0; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | /* |
| 690 | * Options without arguments |
| 691 | */ |
| 692 | |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 693 | if (optname == SO_BINDTODEVICE) |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 694 | return sock_setbindtodevice(sk, optval, optlen); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 695 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 696 | if (optlen < sizeof(int)) |
| 697 | return -EINVAL; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | if (get_user(val, (int __user *)optval)) |
| 700 | return -EFAULT; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 701 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 702 | valbool = val ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
| 704 | lock_sock(sk); |
| 705 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 706 | switch (optname) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 707 | case SO_DEBUG: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 708 | if (val && !capable(CAP_NET_ADMIN)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 709 | ret = -EACCES; |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 710 | else |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 711 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 712 | break; |
| 713 | case SO_REUSEADDR: |
Pavel Emelyanov | 4a17fd5 | 2012-04-19 03:39:36 +0000 | [diff] [blame] | 714 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 715 | break; |
Tom Herbert | 055dc21 | 2013-01-22 09:49:50 +0000 | [diff] [blame] | 716 | case SO_REUSEPORT: |
| 717 | sk->sk_reuseport = valbool; |
| 718 | break; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 719 | case SO_TYPE: |
Jan Engelhardt | 49c794e | 2009-08-04 07:28:28 +0000 | [diff] [blame] | 720 | case SO_PROTOCOL: |
Jan Engelhardt | 0d6038e | 2009-08-04 07:28:29 +0000 | [diff] [blame] | 721 | case SO_DOMAIN: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 722 | case SO_ERROR: |
| 723 | ret = -ENOPROTOOPT; |
| 724 | break; |
| 725 | case SO_DONTROUTE: |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 726 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 727 | break; |
| 728 | case SO_BROADCAST: |
| 729 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); |
| 730 | break; |
| 731 | case SO_SNDBUF: |
| 732 | /* Don't error on this BSD doesn't and if you think |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 733 | * about it this is right. Otherwise apps have to |
| 734 | * play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 735 | * are treated in BSD as hints |
| 736 | */ |
| 737 | val = min_t(u32, val, sysctl_wmem_max); |
Patrick McHardy | b0573de | 2005-08-09 19:30:51 -0700 | [diff] [blame] | 738 | set_sndbuf: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 739 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 740 | sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); |
| 741 | /* Wake up sending tasks if we upped the value. */ |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 742 | sk->sk_write_space(sk); |
| 743 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 745 | case SO_SNDBUFFORCE: |
| 746 | if (!capable(CAP_NET_ADMIN)) { |
| 747 | ret = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | break; |
| 749 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 750 | goto set_sndbuf; |
| 751 | |
| 752 | case SO_RCVBUF: |
| 753 | /* Don't error on this BSD doesn't and if you think |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 754 | * about it this is right. Otherwise apps have to |
| 755 | * play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 756 | * are treated in BSD as hints |
| 757 | */ |
| 758 | val = min_t(u32, val, sysctl_rmem_max); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 759 | set_rcvbuf: |
| 760 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| 761 | /* |
| 762 | * We double it on the way in to account for |
| 763 | * "struct sk_buff" etc. overhead. Applications |
| 764 | * assume that the SO_RCVBUF setting they make will |
| 765 | * allow that much actual data to be received on that |
| 766 | * socket. |
| 767 | * |
| 768 | * Applications are unaware that "struct sk_buff" and |
| 769 | * other overheads allocate from the receive buffer |
| 770 | * during socket buffer allocation. |
| 771 | * |
| 772 | * And after considering the possible alternatives, |
| 773 | * returning the value we actually used in getsockopt |
| 774 | * is the most desirable behavior. |
| 775 | */ |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 776 | sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 777 | break; |
| 778 | |
| 779 | case SO_RCVBUFFORCE: |
| 780 | if (!capable(CAP_NET_ADMIN)) { |
| 781 | ret = -EPERM; |
| 782 | break; |
| 783 | } |
| 784 | goto set_rcvbuf; |
| 785 | |
| 786 | case SO_KEEPALIVE: |
| 787 | #ifdef CONFIG_INET |
Eric Dumazet | 3e10986 | 2012-09-24 07:00:11 +0000 | [diff] [blame] | 788 | if (sk->sk_protocol == IPPROTO_TCP && |
| 789 | sk->sk_type == SOCK_STREAM) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 790 | tcp_set_keepalive(sk, valbool); |
| 791 | #endif |
| 792 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
| 793 | break; |
| 794 | |
| 795 | case SO_OOBINLINE: |
| 796 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); |
| 797 | break; |
| 798 | |
| 799 | case SO_NO_CHECK: |
Tom Herbert | 28448b8 | 2014-05-23 08:47:19 -0700 | [diff] [blame] | 800 | sk->sk_no_check_tx = valbool; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 801 | break; |
| 802 | |
| 803 | case SO_PRIORITY: |
Eric W. Biederman | 5e1fccc | 2012-11-16 03:03:04 +0000 | [diff] [blame] | 804 | if ((val >= 0 && val <= 6) || |
| 805 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 806 | sk->sk_priority = val; |
| 807 | else |
| 808 | ret = -EPERM; |
| 809 | break; |
| 810 | |
| 811 | case SO_LINGER: |
| 812 | if (optlen < sizeof(ling)) { |
| 813 | ret = -EINVAL; /* 1003.1g */ |
| 814 | break; |
| 815 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 816 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 817 | ret = -EFAULT; |
| 818 | break; |
| 819 | } |
| 820 | if (!ling.l_onoff) |
| 821 | sock_reset_flag(sk, SOCK_LINGER); |
| 822 | else { |
| 823 | #if (BITS_PER_LONG == 32) |
| 824 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
| 825 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; |
| 826 | else |
| 827 | #endif |
| 828 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; |
| 829 | sock_set_flag(sk, SOCK_LINGER); |
| 830 | } |
| 831 | break; |
| 832 | |
| 833 | case SO_BSDCOMPAT: |
| 834 | sock_warn_obsolete_bsdism("setsockopt"); |
| 835 | break; |
| 836 | |
| 837 | case SO_PASSCRED: |
| 838 | if (valbool) |
| 839 | set_bit(SOCK_PASSCRED, &sock->flags); |
| 840 | else |
| 841 | clear_bit(SOCK_PASSCRED, &sock->flags); |
| 842 | break; |
| 843 | |
| 844 | case SO_TIMESTAMP: |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 845 | case SO_TIMESTAMPNS: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 846 | if (valbool) { |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 847 | if (optname == SO_TIMESTAMP) |
| 848 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| 849 | else |
| 850 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 851 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 852 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 853 | } else { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 854 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 855 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| 856 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 857 | break; |
| 858 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 859 | case SO_TIMESTAMPING: |
| 860 | if (val & ~SOF_TIMESTAMPING_MASK) { |
Rémi Denis-Courmont | f249fb7 | 2009-07-20 00:47:04 +0000 | [diff] [blame] | 861 | ret = -EINVAL; |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 862 | break; |
| 863 | } |
Willem de Bruijn | b245be1 | 2015-01-30 13:29:32 -0500 | [diff] [blame] | 864 | |
Willem de Bruijn | 09c2d25 | 2014-08-04 22:11:47 -0400 | [diff] [blame] | 865 | if (val & SOF_TIMESTAMPING_OPT_ID && |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 866 | !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
| 867 | if (sk->sk_protocol == IPPROTO_TCP) { |
| 868 | if (sk->sk_state != TCP_ESTABLISHED) { |
| 869 | ret = -EINVAL; |
| 870 | break; |
| 871 | } |
| 872 | sk->sk_tskey = tcp_sk(sk)->snd_una; |
| 873 | } else { |
| 874 | sk->sk_tskey = 0; |
| 875 | } |
| 876 | } |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 877 | sk->sk_tsflags = val; |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 878 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
| 879 | sock_enable_timestamp(sk, |
| 880 | SOCK_TIMESTAMPING_RX_SOFTWARE); |
| 881 | else |
| 882 | sock_disable_timestamp(sk, |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 883 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 884 | break; |
| 885 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 886 | case SO_RCVLOWAT: |
| 887 | if (val < 0) |
| 888 | val = INT_MAX; |
| 889 | sk->sk_rcvlowat = val ? : 1; |
| 890 | break; |
| 891 | |
| 892 | case SO_RCVTIMEO: |
| 893 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); |
| 894 | break; |
| 895 | |
| 896 | case SO_SNDTIMEO: |
| 897 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); |
| 898 | break; |
| 899 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 900 | case SO_ATTACH_FILTER: |
| 901 | ret = -EINVAL; |
| 902 | if (optlen == sizeof(struct sock_fprog)) { |
| 903 | struct sock_fprog fprog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 905 | ret = -EFAULT; |
| 906 | if (copy_from_user(&fprog, optval, sizeof(fprog))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 909 | ret = sk_attach_filter(&fprog, sk); |
| 910 | } |
| 911 | break; |
| 912 | |
Alexei Starovoitov | 89aa075 | 2014-12-01 15:06:35 -0800 | [diff] [blame] | 913 | case SO_ATTACH_BPF: |
| 914 | ret = -EINVAL; |
| 915 | if (optlen == sizeof(u32)) { |
| 916 | u32 ufd; |
| 917 | |
| 918 | ret = -EFAULT; |
| 919 | if (copy_from_user(&ufd, optval, sizeof(ufd))) |
| 920 | break; |
| 921 | |
| 922 | ret = sk_attach_bpf(ufd, sk); |
| 923 | } |
| 924 | break; |
| 925 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 926 | case SO_DETACH_FILTER: |
Pavel Emelyanov | 55b3332 | 2007-10-17 21:21:26 -0700 | [diff] [blame] | 927 | ret = sk_detach_filter(sk); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 928 | break; |
| 929 | |
Vincent Bernat | d59577b | 2013-01-16 22:55:49 +0100 | [diff] [blame] | 930 | case SO_LOCK_FILTER: |
| 931 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) |
| 932 | ret = -EPERM; |
| 933 | else |
| 934 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); |
| 935 | break; |
| 936 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 937 | case SO_PASSSEC: |
| 938 | if (valbool) |
| 939 | set_bit(SOCK_PASSSEC, &sock->flags); |
| 940 | else |
| 941 | clear_bit(SOCK_PASSSEC, &sock->flags); |
| 942 | break; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 943 | case SO_MARK: |
Eric W. Biederman | 5e1fccc | 2012-11-16 03:03:04 +0000 | [diff] [blame] | 944 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 945 | ret = -EPERM; |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 946 | else |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 947 | sk->sk_mark = val; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 948 | break; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 949 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 950 | case SO_RXQ_OVFL: |
Johannes Berg | 8083f0f | 2011-10-07 03:30:20 +0000 | [diff] [blame] | 951 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 952 | break; |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 953 | |
| 954 | case SO_WIFI_STATUS: |
| 955 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); |
| 956 | break; |
| 957 | |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 958 | case SO_PEEK_OFF: |
| 959 | if (sock->ops->set_peek_off) |
Sasha Levin | 12663bf | 2013-12-07 17:26:27 -0500 | [diff] [blame] | 960 | ret = sock->ops->set_peek_off(sk, val); |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 961 | else |
| 962 | ret = -EOPNOTSUPP; |
| 963 | break; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 964 | |
| 965 | case SO_NOFCS: |
| 966 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); |
| 967 | break; |
| 968 | |
Keller, Jacob E | 7d4c04f | 2013-03-28 11:19:25 +0000 | [diff] [blame] | 969 | case SO_SELECT_ERR_QUEUE: |
| 970 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); |
| 971 | break; |
| 972 | |
Cong Wang | e0d1095 | 2013-08-01 11:10:25 +0800 | [diff] [blame] | 973 | #ifdef CONFIG_NET_RX_BUSY_POLL |
Eliezer Tamir | 64b0dc5 | 2013-07-10 17:13:36 +0300 | [diff] [blame] | 974 | case SO_BUSY_POLL: |
Eliezer Tamir | dafcc43 | 2013-06-14 16:33:57 +0300 | [diff] [blame] | 975 | /* allow unprivileged users to decrease the value */ |
| 976 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) |
| 977 | ret = -EPERM; |
| 978 | else { |
| 979 | if (val < 0) |
| 980 | ret = -EINVAL; |
| 981 | else |
| 982 | sk->sk_ll_usec = val; |
| 983 | } |
| 984 | break; |
| 985 | #endif |
Eric Dumazet | 62748f3 | 2013-09-24 08:20:52 -0700 | [diff] [blame] | 986 | |
| 987 | case SO_MAX_PACING_RATE: |
| 988 | sk->sk_max_pacing_rate = val; |
| 989 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, |
| 990 | sk->sk_max_pacing_rate); |
| 991 | break; |
| 992 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 993 | default: |
| 994 | ret = -ENOPROTOOPT; |
| 995 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 996 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | release_sock(sk); |
| 998 | return ret; |
| 999 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1000 | EXPORT_SYMBOL(sock_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | |
| 1002 | |
stephen hemminger | 8f09898 | 2014-01-03 09:17:14 -0800 | [diff] [blame] | 1003 | static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
| 1004 | struct ucred *ucred) |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 1005 | { |
| 1006 | ucred->pid = pid_vnr(pid); |
| 1007 | ucred->uid = ucred->gid = -1; |
| 1008 | if (cred) { |
| 1009 | struct user_namespace *current_ns = current_user_ns(); |
| 1010 | |
Eric W. Biederman | b2e4f54 | 2012-05-23 16:39:45 -0600 | [diff] [blame] | 1011 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
| 1012 | ucred->gid = from_kgid_munged(current_ns, cred->egid); |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 1013 | } |
| 1014 | } |
| 1015 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | int sock_getsockopt(struct socket *sock, int level, int optname, |
| 1017 | char __user *optval, int __user *optlen) |
| 1018 | { |
| 1019 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1020 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1021 | union { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1022 | int val; |
| 1023 | struct linger ling; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | struct timeval tm; |
| 1025 | } v; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1026 | |
H Hartley Sweeten | 4d0392b | 2010-01-15 01:08:58 -0800 | [diff] [blame] | 1027 | int lv = sizeof(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | int len; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1029 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1030 | if (get_user(len, optlen)) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1031 | return -EFAULT; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1032 | if (len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | return -EINVAL; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1034 | |
Eugene Teo | 50fee1d | 2009-02-23 15:38:41 -0800 | [diff] [blame] | 1035 | memset(&v, 0, sizeof(v)); |
Clément Lecigne | df0bca0 | 2009-02-12 16:59:09 -0800 | [diff] [blame] | 1036 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1037 | switch (optname) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1038 | case SO_DEBUG: |
| 1039 | v.val = sock_flag(sk, SOCK_DBG); |
| 1040 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1041 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1042 | case SO_DONTROUTE: |
| 1043 | v.val = sock_flag(sk, SOCK_LOCALROUTE); |
| 1044 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1045 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1046 | case SO_BROADCAST: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1047 | v.val = sock_flag(sk, SOCK_BROADCAST); |
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_SNDBUF: |
| 1051 | v.val = sk->sk_sndbuf; |
| 1052 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1053 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1054 | case SO_RCVBUF: |
| 1055 | v.val = sk->sk_rcvbuf; |
| 1056 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1058 | case SO_REUSEADDR: |
| 1059 | v.val = sk->sk_reuse; |
| 1060 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | |
Tom Herbert | 055dc21 | 2013-01-22 09:49:50 +0000 | [diff] [blame] | 1062 | case SO_REUSEPORT: |
| 1063 | v.val = sk->sk_reuseport; |
| 1064 | break; |
| 1065 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1066 | case SO_KEEPALIVE: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1067 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1068 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1070 | case SO_TYPE: |
| 1071 | v.val = sk->sk_type; |
| 1072 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | |
Jan Engelhardt | 49c794e | 2009-08-04 07:28:28 +0000 | [diff] [blame] | 1074 | case SO_PROTOCOL: |
| 1075 | v.val = sk->sk_protocol; |
| 1076 | break; |
| 1077 | |
Jan Engelhardt | 0d6038e | 2009-08-04 07:28:29 +0000 | [diff] [blame] | 1078 | case SO_DOMAIN: |
| 1079 | v.val = sk->sk_family; |
| 1080 | break; |
| 1081 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1082 | case SO_ERROR: |
| 1083 | v.val = -sock_error(sk); |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1084 | if (v.val == 0) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1085 | v.val = xchg(&sk->sk_err_soft, 0); |
| 1086 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1088 | case SO_OOBINLINE: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1089 | v.val = sock_flag(sk, SOCK_URGINLINE); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1090 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1091 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1092 | case SO_NO_CHECK: |
Tom Herbert | 28448b8 | 2014-05-23 08:47:19 -0700 | [diff] [blame] | 1093 | v.val = sk->sk_no_check_tx; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1094 | break; |
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 | case SO_PRIORITY: |
| 1097 | v.val = sk->sk_priority; |
| 1098 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1099 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1100 | case SO_LINGER: |
| 1101 | lv = sizeof(v.ling); |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1102 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1103 | v.ling.l_linger = sk->sk_lingertime / HZ; |
| 1104 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1105 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1106 | case SO_BSDCOMPAT: |
| 1107 | sock_warn_obsolete_bsdism("getsockopt"); |
| 1108 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1110 | case SO_TIMESTAMP: |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 1111 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
| 1112 | !sock_flag(sk, SOCK_RCVTSTAMPNS); |
| 1113 | break; |
| 1114 | |
| 1115 | case SO_TIMESTAMPNS: |
| 1116 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1117 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1119 | case SO_TIMESTAMPING: |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 1120 | v.val = sk->sk_tsflags; |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1121 | break; |
| 1122 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1123 | case SO_RCVTIMEO: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1124 | lv = sizeof(struct timeval); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1125 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 1126 | v.tm.tv_sec = 0; |
| 1127 | v.tm.tv_usec = 0; |
| 1128 | } else { |
| 1129 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; |
| 1130 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1132 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1134 | case SO_SNDTIMEO: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1135 | lv = sizeof(struct timeval); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1136 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 1137 | v.tm.tv_sec = 0; |
| 1138 | v.tm.tv_usec = 0; |
| 1139 | } else { |
| 1140 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; |
| 1141 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; |
| 1142 | } |
| 1143 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1145 | case SO_RCVLOWAT: |
| 1146 | v.val = sk->sk_rcvlowat; |
| 1147 | break; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 1148 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1149 | case SO_SNDLOWAT: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1150 | v.val = 1; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1151 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1153 | case SO_PASSCRED: |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 1154 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1155 | break; |
| 1156 | |
| 1157 | case SO_PEERCRED: |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1158 | { |
| 1159 | struct ucred peercred; |
| 1160 | if (len > sizeof(peercred)) |
| 1161 | len = sizeof(peercred); |
| 1162 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); |
| 1163 | if (copy_to_user(optval, &peercred, len)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1164 | return -EFAULT; |
| 1165 | goto lenout; |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1166 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1167 | |
| 1168 | case SO_PEERNAME: |
| 1169 | { |
| 1170 | char address[128]; |
| 1171 | |
| 1172 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) |
| 1173 | return -ENOTCONN; |
| 1174 | if (lv < len) |
| 1175 | return -EINVAL; |
| 1176 | if (copy_to_user(optval, address, len)) |
| 1177 | return -EFAULT; |
| 1178 | goto lenout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1180 | |
| 1181 | /* Dubious BSD thing... Probably nobody even uses it, but |
| 1182 | * the UNIX standard wants it for whatever reason... -DaveM |
| 1183 | */ |
| 1184 | case SO_ACCEPTCONN: |
| 1185 | v.val = sk->sk_state == TCP_LISTEN; |
| 1186 | break; |
| 1187 | |
| 1188 | case SO_PASSSEC: |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 1189 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1190 | break; |
| 1191 | |
| 1192 | case SO_PEERSEC: |
| 1193 | return security_socket_getpeersec_stream(sock, optval, optlen, len); |
| 1194 | |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 1195 | case SO_MARK: |
| 1196 | v.val = sk->sk_mark; |
| 1197 | break; |
| 1198 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1199 | case SO_RXQ_OVFL: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1200 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1201 | break; |
| 1202 | |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 1203 | case SO_WIFI_STATUS: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1204 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 1205 | break; |
| 1206 | |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 1207 | case SO_PEEK_OFF: |
| 1208 | if (!sock->ops->set_peek_off) |
| 1209 | return -EOPNOTSUPP; |
| 1210 | |
| 1211 | v.val = sk->sk_peek_off; |
| 1212 | break; |
David S. Miller | bc2f799 | 2012-02-24 14:48:34 -0500 | [diff] [blame] | 1213 | case SO_NOFCS: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1214 | v.val = sock_flag(sk, SOCK_NOFCS); |
David S. Miller | bc2f799 | 2012-02-24 14:48:34 -0500 | [diff] [blame] | 1215 | break; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1216 | |
Pavel Emelyanov | f7b86bf | 2012-10-18 23:55:56 +0000 | [diff] [blame] | 1217 | case SO_BINDTODEVICE: |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1218 | return sock_getbindtodevice(sk, optval, optlen, len); |
| 1219 | |
Pavel Emelyanov | a8fc927 | 2012-11-01 02:01:48 +0000 | [diff] [blame] | 1220 | case SO_GET_FILTER: |
| 1221 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); |
| 1222 | if (len < 0) |
| 1223 | return len; |
| 1224 | |
| 1225 | goto lenout; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1226 | |
Vincent Bernat | d59577b | 2013-01-16 22:55:49 +0100 | [diff] [blame] | 1227 | case SO_LOCK_FILTER: |
| 1228 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); |
| 1229 | break; |
| 1230 | |
Michal Sekletar | ea02f94 | 2014-01-17 17:09:45 +0100 | [diff] [blame] | 1231 | case SO_BPF_EXTENSIONS: |
| 1232 | v.val = bpf_tell_extensions(); |
| 1233 | break; |
| 1234 | |
Keller, Jacob E | 7d4c04f | 2013-03-28 11:19:25 +0000 | [diff] [blame] | 1235 | case SO_SELECT_ERR_QUEUE: |
| 1236 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); |
| 1237 | break; |
| 1238 | |
Cong Wang | e0d1095 | 2013-08-01 11:10:25 +0800 | [diff] [blame] | 1239 | #ifdef CONFIG_NET_RX_BUSY_POLL |
Eliezer Tamir | 64b0dc5 | 2013-07-10 17:13:36 +0300 | [diff] [blame] | 1240 | case SO_BUSY_POLL: |
Eliezer Tamir | dafcc43 | 2013-06-14 16:33:57 +0300 | [diff] [blame] | 1241 | v.val = sk->sk_ll_usec; |
| 1242 | break; |
| 1243 | #endif |
| 1244 | |
Eric Dumazet | 62748f3 | 2013-09-24 08:20:52 -0700 | [diff] [blame] | 1245 | case SO_MAX_PACING_RATE: |
| 1246 | v.val = sk->sk_max_pacing_rate; |
| 1247 | break; |
| 1248 | |
Eric Dumazet | 2c8c56e | 2014-11-11 05:54:28 -0800 | [diff] [blame] | 1249 | case SO_INCOMING_CPU: |
| 1250 | v.val = sk->sk_incoming_cpu; |
| 1251 | break; |
| 1252 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1253 | default: |
YOSHIFUJI Hideaki/吉藤英明 | 443b599 | 2015-03-23 18:04:13 +0900 | [diff] [blame] | 1254 | /* We implement the SO_SNDLOWAT etc to not be settable |
| 1255 | * (1003.1g 7). |
| 1256 | */ |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1257 | return -ENOPROTOOPT; |
| 1258 | } |
| 1259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | if (len > lv) |
| 1261 | len = lv; |
| 1262 | if (copy_to_user(optval, &v, len)) |
| 1263 | return -EFAULT; |
| 1264 | lenout: |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1265 | if (put_user(len, optlen)) |
| 1266 | return -EFAULT; |
| 1267 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1270 | /* |
| 1271 | * Initialize an sk_lock. |
| 1272 | * |
| 1273 | * (We also register the sk_lock with the lock validator.) |
| 1274 | */ |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 1275 | static inline void sock_lock_init(struct sock *sk) |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1276 | { |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1277 | sock_lock_init_class_and_name(sk, |
| 1278 | af_family_slock_key_strings[sk->sk_family], |
| 1279 | af_family_slock_keys + sk->sk_family, |
| 1280 | af_family_key_strings[sk->sk_family], |
| 1281 | af_family_keys + sk->sk_family); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1282 | } |
| 1283 | |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 1284 | /* |
| 1285 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, |
| 1286 | * 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] | 1287 | * 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] | 1288 | */ |
Pavel Emelyanov | f1a6c4d | 2007-11-01 00:29:45 -0700 | [diff] [blame] | 1289 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
| 1290 | { |
| 1291 | #ifdef CONFIG_SECURITY_NETWORK |
| 1292 | void *sptr = nsk->sk_security; |
| 1293 | #endif |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 1294 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
| 1295 | |
| 1296 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, |
| 1297 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); |
| 1298 | |
Pavel Emelyanov | f1a6c4d | 2007-11-01 00:29:45 -0700 | [diff] [blame] | 1299 | #ifdef CONFIG_SECURITY_NETWORK |
| 1300 | nsk->sk_security = sptr; |
| 1301 | security_sk_clone(osk, nsk); |
| 1302 | #endif |
| 1303 | } |
| 1304 | |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 1305 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) |
| 1306 | { |
| 1307 | unsigned long nulls1, nulls2; |
| 1308 | |
| 1309 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); |
| 1310 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); |
| 1311 | if (nulls1 > nulls2) |
| 1312 | swap(nulls1, nulls2); |
| 1313 | |
| 1314 | if (nulls1 != 0) |
| 1315 | memset((char *)sk, 0, nulls1); |
| 1316 | memset((char *)sk + nulls1 + sizeof(void *), 0, |
| 1317 | nulls2 - nulls1 - sizeof(void *)); |
| 1318 | memset((char *)sk + nulls2 + sizeof(void *), 0, |
| 1319 | size - nulls2 - sizeof(void *)); |
| 1320 | } |
| 1321 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); |
| 1322 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1323 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
| 1324 | int family) |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1325 | { |
| 1326 | struct sock *sk; |
| 1327 | struct kmem_cache *slab; |
| 1328 | |
| 1329 | slab = prot->slab; |
Eric Dumazet | e912b11 | 2009-07-08 19:36:05 +0000 | [diff] [blame] | 1330 | if (slab != NULL) { |
| 1331 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); |
| 1332 | if (!sk) |
| 1333 | return sk; |
| 1334 | if (priority & __GFP_ZERO) { |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 1335 | if (prot->clear_sk) |
| 1336 | prot->clear_sk(sk, prot->obj_size); |
| 1337 | else |
| 1338 | sk_prot_clear_nulls(sk, prot->obj_size); |
Eric Dumazet | e912b11 | 2009-07-08 19:36:05 +0000 | [diff] [blame] | 1339 | } |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 1340 | } else |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1341 | sk = kmalloc(prot->obj_size, priority); |
| 1342 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1343 | if (sk != NULL) { |
Vegard Nossum | a98b65a | 2009-02-26 14:46:57 +0100 | [diff] [blame] | 1344 | kmemcheck_annotate_bitfield(sk, flags); |
| 1345 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1346 | if (security_sk_alloc(sk, family, priority)) |
| 1347 | goto out_free; |
| 1348 | |
| 1349 | if (!try_module_get(prot->owner)) |
| 1350 | goto out_free_sec; |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1351 | sk_tx_queue_clear(sk); |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1352 | } |
| 1353 | |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1354 | return sk; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1355 | |
| 1356 | out_free_sec: |
| 1357 | security_sk_free(sk); |
| 1358 | out_free: |
| 1359 | if (slab != NULL) |
| 1360 | kmem_cache_free(slab, sk); |
| 1361 | else |
| 1362 | kfree(sk); |
| 1363 | return NULL; |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1364 | } |
| 1365 | |
| 1366 | static void sk_prot_free(struct proto *prot, struct sock *sk) |
| 1367 | { |
| 1368 | struct kmem_cache *slab; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1369 | struct module *owner; |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1370 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1371 | owner = prot->owner; |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1372 | slab = prot->slab; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1373 | |
| 1374 | security_sk_free(sk); |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1375 | if (slab != NULL) |
| 1376 | kmem_cache_free(slab, sk); |
| 1377 | else |
| 1378 | kfree(sk); |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1379 | module_put(owner); |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1380 | } |
| 1381 | |
Daniel Borkmann | 86f8515 | 2013-12-29 17:27:11 +0100 | [diff] [blame] | 1382 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
Zefan Li | 6ffd464 | 2013-04-08 20:03:47 +0000 | [diff] [blame] | 1383 | void sock_update_netprioidx(struct sock *sk) |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1384 | { |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1385 | if (in_interrupt()) |
| 1386 | return; |
Neil Horman | 2b73bc6 | 2012-02-10 05:43:38 +0000 | [diff] [blame] | 1387 | |
Zefan Li | 6ffd464 | 2013-04-08 20:03:47 +0000 | [diff] [blame] | 1388 | sk->sk_cgrp_prioidx = task_netprioidx(current); |
Neil Horman | 5bc1421 | 2011-11-22 05:10:51 +0000 | [diff] [blame] | 1389 | } |
| 1390 | EXPORT_SYMBOL_GPL(sock_update_netprioidx); |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1391 | #endif |
| 1392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | /** |
| 1394 | * sk_alloc - All socket objects are allocated here |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1395 | * @net: the applicable net namespace |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1396 | * @family: protocol family |
| 1397 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 1398 | * @prot: struct proto associated with this new sock instance |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | */ |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 1400 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 1401 | struct proto *prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | { |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1403 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | |
Pavel Emelyanov | 154adbc | 2007-11-01 00:38:43 -0700 | [diff] [blame] | 1405 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | if (sk) { |
Pavel Emelyanov | 154adbc | 2007-11-01 00:38:43 -0700 | [diff] [blame] | 1407 | sk->sk_family = family; |
| 1408 | /* |
| 1409 | * See comment in struct sock definition to understand |
| 1410 | * why we need sk_prot_creator -acme |
| 1411 | */ |
| 1412 | sk->sk_prot = sk->sk_prot_creator = prot; |
| 1413 | sock_lock_init(sk); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1414 | sock_net_set(sk, get_net(net)); |
Jarek Poplawski | d66ee05 | 2009-08-30 23:15:36 +0000 | [diff] [blame] | 1415 | atomic_set(&sk->sk_wmem_alloc, 1); |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1416 | |
Zefan Li | 211d2f97 | 2013-04-08 20:03:35 +0000 | [diff] [blame] | 1417 | sock_update_classid(sk); |
Zefan Li | 6ffd464 | 2013-04-08 20:03:47 +0000 | [diff] [blame] | 1418 | sock_update_netprioidx(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | } |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1420 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1421 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1423 | EXPORT_SYMBOL(sk_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1425 | static void __sk_free(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | { |
| 1427 | struct sk_filter *filter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | |
| 1429 | if (sk->sk_destruct) |
| 1430 | sk->sk_destruct(sk); |
| 1431 | |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 1432 | filter = rcu_dereference_check(sk->sk_filter, |
| 1433 | atomic_read(&sk->sk_wmem_alloc) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | if (filter) { |
Pavel Emelyanov | 309dd5f | 2007-10-17 21:21:51 -0700 | [diff] [blame] | 1435 | sk_filter_uncharge(sk, filter); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 1436 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | } |
| 1438 | |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 1439 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | |
| 1441 | if (atomic_read(&sk->sk_omem_alloc)) |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 1442 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
| 1443 | __func__, atomic_read(&sk->sk_omem_alloc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1445 | if (sk->sk_peer_cred) |
| 1446 | put_cred(sk->sk_peer_cred); |
| 1447 | put_pid(sk->sk_peer_pid); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1448 | put_net(sock_net(sk)); |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1449 | sk_prot_free(sk->sk_prot_creator, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | } |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1451 | |
| 1452 | void sk_free(struct sock *sk) |
| 1453 | { |
| 1454 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1455 | * We subtract one from sk_wmem_alloc and can know if |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1456 | * some packets are still in some tx queue. |
| 1457 | * If not null, sock_wfree() will call __sk_free(sk) later |
| 1458 | */ |
| 1459 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) |
| 1460 | __sk_free(sk); |
| 1461 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1462 | EXPORT_SYMBOL(sk_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1464 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1465 | * Last sock_put should drop reference to sk->sk_net. It has already |
| 1466 | * been dropped in sk_change_net. Taking reference to stopping namespace |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1467 | * is not an option. |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1468 | * 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] | 1469 | * destroy it in the context of init_net. |
| 1470 | */ |
| 1471 | void sk_release_kernel(struct sock *sk) |
| 1472 | { |
| 1473 | if (sk == NULL || sk->sk_socket == NULL) |
| 1474 | return; |
| 1475 | |
| 1476 | sock_hold(sk); |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1477 | sock_net_set(sk, get_net(&init_net)); |
Ying Xue | c243d7e | 2015-03-16 18:19:12 +0800 | [diff] [blame] | 1478 | sock_release(sk->sk_socket); |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1479 | sock_put(sk); |
| 1480 | } |
David S. Miller | 45af175 | 2008-02-29 11:33:19 -0800 | [diff] [blame] | 1481 | EXPORT_SYMBOL(sk_release_kernel); |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1482 | |
Stephen Rothwell | 475f1b5 | 2012-01-09 16:33:16 +1100 | [diff] [blame] | 1483 | static void sk_update_clone(const struct sock *sk, struct sock *newsk) |
| 1484 | { |
| 1485 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) |
| 1486 | sock_update_memcg(newsk); |
| 1487 | } |
| 1488 | |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 1489 | /** |
| 1490 | * sk_clone_lock - clone a socket, and lock its clone |
| 1491 | * @sk: the socket to clone |
| 1492 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 1493 | * |
| 1494 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) |
| 1495 | */ |
| 1496 | 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] | 1497 | { |
Pavel Emelyanov | 8fd1d17 | 2007-11-01 00:37:32 -0700 | [diff] [blame] | 1498 | struct sock *newsk; |
Alexei Starovoitov | 278571b | 2014-07-30 20:34:12 -0700 | [diff] [blame] | 1499 | bool is_charged = true; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1500 | |
Pavel Emelyanov | 8fd1d17 | 2007-11-01 00:37:32 -0700 | [diff] [blame] | 1501 | 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] | 1502 | if (newsk != NULL) { |
| 1503 | struct sk_filter *filter; |
| 1504 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 1505 | sock_copy(newsk, sk); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1506 | |
| 1507 | /* SANITY */ |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1508 | get_net(sock_net(newsk)); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1509 | sk_node_init(&newsk->sk_node); |
| 1510 | sock_lock_init(newsk); |
| 1511 | bh_lock_sock(newsk); |
Eric Dumazet | fa438cc | 2007-03-04 16:05:44 -0800 | [diff] [blame] | 1512 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 1513 | newsk->sk_backlog.len = 0; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1514 | |
| 1515 | atomic_set(&newsk->sk_rmem_alloc, 0); |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1516 | /* |
| 1517 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) |
| 1518 | */ |
| 1519 | atomic_set(&newsk->sk_wmem_alloc, 1); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1520 | atomic_set(&newsk->sk_omem_alloc, 0); |
| 1521 | skb_queue_head_init(&newsk->sk_receive_queue); |
| 1522 | skb_queue_head_init(&newsk->sk_write_queue); |
| 1523 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 1524 | spin_lock_init(&newsk->sk_dst_lock); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1525 | rwlock_init(&newsk->sk_callback_lock); |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 1526 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
| 1527 | af_callback_keys + newsk->sk_family, |
| 1528 | af_family_clock_key_strings[newsk->sk_family]); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1529 | |
| 1530 | newsk->sk_dst_cache = NULL; |
| 1531 | newsk->sk_wmem_queued = 0; |
| 1532 | newsk->sk_forward_alloc = 0; |
| 1533 | newsk->sk_send_head = NULL; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1534 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
| 1535 | |
| 1536 | sock_reset_flag(newsk, SOCK_DONE); |
| 1537 | skb_queue_head_init(&newsk->sk_error_queue); |
| 1538 | |
Eric Dumazet | 0d7da9d | 2010-10-25 03:47:05 +0000 | [diff] [blame] | 1539 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1540 | if (filter != NULL) |
Alexei Starovoitov | 278571b | 2014-07-30 20:34:12 -0700 | [diff] [blame] | 1541 | /* though it's an empty new sock, the charging may fail |
| 1542 | * if sysctl_optmem_max was changed between creation of |
| 1543 | * original socket and cloning |
| 1544 | */ |
| 1545 | is_charged = sk_filter_charge(newsk, filter); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1546 | |
Alexei Starovoitov | 278571b | 2014-07-30 20:34:12 -0700 | [diff] [blame] | 1547 | if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) { |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1548 | /* It is still raw copy of parent, so invalidate |
| 1549 | * destructor and make plain sk_free() */ |
| 1550 | newsk->sk_destruct = NULL; |
Thomas Gleixner | b0691c8 | 2011-10-25 02:30:50 +0000 | [diff] [blame] | 1551 | bh_unlock_sock(newsk); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1552 | sk_free(newsk); |
| 1553 | newsk = NULL; |
| 1554 | goto out; |
| 1555 | } |
| 1556 | |
| 1557 | newsk->sk_err = 0; |
| 1558 | newsk->sk_priority = 0; |
Eric Dumazet | 2c8c56e | 2014-11-11 05:54:28 -0800 | [diff] [blame] | 1559 | newsk->sk_incoming_cpu = raw_smp_processor_id(); |
Eric Dumazet | 33cf7c9 | 2015-03-11 18:53:14 -0700 | [diff] [blame] | 1560 | atomic64_set(&newsk->sk_cookie, 0); |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 1561 | /* |
| 1562 | * Before updating sk_refcnt, we must commit prior changes to memory |
| 1563 | * (Documentation/RCU/rculist_nulls.txt for details) |
| 1564 | */ |
| 1565 | smp_wmb(); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1566 | atomic_set(&newsk->sk_refcnt, 2); |
| 1567 | |
| 1568 | /* |
| 1569 | * Increment the counter in the same struct proto as the master |
| 1570 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that |
| 1571 | * is the same as sk->sk_prot->socks, as this field was copied |
| 1572 | * with memcpy). |
| 1573 | * |
| 1574 | * This _changes_ the previous behaviour, where |
| 1575 | * tcp_create_openreq_child always was incrementing the |
| 1576 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have |
| 1577 | * to be taken into account in all callers. -acme |
| 1578 | */ |
| 1579 | sk_refcnt_debug_inc(newsk); |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1580 | sk_set_socket(newsk, NULL); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1581 | newsk->sk_wq = NULL; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1582 | |
Glauber Costa | f3f511e | 2012-01-05 20:16:39 +0000 | [diff] [blame] | 1583 | sk_update_clone(sk, newsk); |
| 1584 | |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1585 | if (newsk->sk_prot->sockets_allocated) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1586 | sk_sockets_allocated_inc(newsk); |
Octavian Purdila | 704da560 | 2010-01-08 00:00:09 -0800 | [diff] [blame] | 1587 | |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 1588 | if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) |
Octavian Purdila | 704da560 | 2010-01-08 00:00:09 -0800 | [diff] [blame] | 1589 | net_enable_timestamp(); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1590 | } |
| 1591 | out: |
| 1592 | return newsk; |
| 1593 | } |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 1594 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1595 | |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1596 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
| 1597 | { |
| 1598 | __sk_dst_set(sk, dst); |
| 1599 | sk->sk_route_caps = dst->dev->features; |
| 1600 | if (sk->sk_route_caps & NETIF_F_GSO) |
Herbert Xu | 4fcd6b9 | 2007-05-31 22:15:50 -0700 | [diff] [blame] | 1601 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1602 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1603 | if (sk_can_gso(sk)) { |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1604 | if (dst->header_len) { |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1605 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1606 | } else { |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1607 | 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] | 1608 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
Ben Hutchings | 1485348 | 2012-07-30 16:11:42 +0000 | [diff] [blame] | 1609 | sk->sk_gso_max_segs = dst->dev->gso_max_segs; |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1610 | } |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1611 | } |
| 1612 | } |
| 1613 | EXPORT_SYMBOL_GPL(sk_setup_caps); |
| 1614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | /* |
| 1616 | * Simple resource managers for sockets. |
| 1617 | */ |
| 1618 | |
| 1619 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1620 | /* |
| 1621 | * Write buffer destructor automatically called from kfree_skb. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | */ |
| 1623 | void sock_wfree(struct sk_buff *skb) |
| 1624 | { |
| 1625 | struct sock *sk = skb->sk; |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1626 | unsigned int len = skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1628 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
| 1629 | /* |
| 1630 | * Keep a reference on sk_wmem_alloc, this will be released |
| 1631 | * after sk_write_space() call |
| 1632 | */ |
| 1633 | atomic_sub(len - 1, &sk->sk_wmem_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | sk->sk_write_space(sk); |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1635 | len = 1; |
| 1636 | } |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1637 | /* |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1638 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
| 1639 | * could not do because of in-flight packets |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1640 | */ |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1641 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1642 | __sk_free(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1644 | EXPORT_SYMBOL(sock_wfree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | |
Eric Dumazet | f2f872f | 2013-07-30 17:55:08 -0700 | [diff] [blame] | 1646 | void skb_orphan_partial(struct sk_buff *skb) |
| 1647 | { |
| 1648 | /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc, |
| 1649 | * so we do not completely orphan skb, but transfert all |
| 1650 | * accounted bytes but one, to avoid unexpected reorders. |
| 1651 | */ |
| 1652 | if (skb->destructor == sock_wfree |
| 1653 | #ifdef CONFIG_INET |
| 1654 | || skb->destructor == tcp_wfree |
| 1655 | #endif |
| 1656 | ) { |
| 1657 | atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc); |
| 1658 | skb->truesize = 1; |
| 1659 | } else { |
| 1660 | skb_orphan(skb); |
| 1661 | } |
| 1662 | } |
| 1663 | EXPORT_SYMBOL(skb_orphan_partial); |
| 1664 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1665 | /* |
| 1666 | * Read buffer destructor automatically called from kfree_skb. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | */ |
| 1668 | void sock_rfree(struct sk_buff *skb) |
| 1669 | { |
| 1670 | struct sock *sk = skb->sk; |
Eric Dumazet | d361fd5 | 2010-07-10 22:45:17 +0000 | [diff] [blame] | 1671 | unsigned int len = skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | |
Eric Dumazet | d361fd5 | 2010-07-10 22:45:17 +0000 | [diff] [blame] | 1673 | atomic_sub(len, &sk->sk_rmem_alloc); |
| 1674 | sk_mem_uncharge(sk, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1676 | EXPORT_SYMBOL(sock_rfree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | |
Oliver Hartkopp | 7768eed | 2015-03-10 19:03:46 +0100 | [diff] [blame] | 1678 | /* |
| 1679 | * Buffer destructor for skbs that are not used directly in read or write |
| 1680 | * path, e.g. for error handler skbs. Automatically called from kfree_skb. |
| 1681 | */ |
Alexander Duyck | 62bccb8 | 2014-09-04 13:31:35 -0400 | [diff] [blame] | 1682 | void sock_efree(struct sk_buff *skb) |
| 1683 | { |
| 1684 | sock_put(skb->sk); |
| 1685 | } |
| 1686 | EXPORT_SYMBOL(sock_efree); |
| 1687 | |
Eric W. Biederman | 976d0201 | 2012-05-23 17:16:53 -0600 | [diff] [blame] | 1688 | kuid_t sock_i_uid(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | { |
Eric W. Biederman | 976d0201 | 2012-05-23 17:16:53 -0600 | [diff] [blame] | 1690 | kuid_t uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1692 | read_lock_bh(&sk->sk_callback_lock); |
Eric W. Biederman | 976d0201 | 2012-05-23 17:16:53 -0600 | [diff] [blame] | 1693 | 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] | 1694 | read_unlock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | return uid; |
| 1696 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1697 | EXPORT_SYMBOL(sock_i_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | |
| 1699 | unsigned long sock_i_ino(struct sock *sk) |
| 1700 | { |
| 1701 | unsigned long ino; |
| 1702 | |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1703 | read_lock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1705 | read_unlock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | return ino; |
| 1707 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1708 | EXPORT_SYMBOL(sock_i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | |
| 1710 | /* |
| 1711 | * Allocate a skb from the socket's send buffer. |
| 1712 | */ |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 1713 | 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] | 1714 | gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | { |
| 1716 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1717 | struct sk_buff *skb = alloc_skb(size, priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | if (skb) { |
| 1719 | skb_set_owner_w(skb, sk); |
| 1720 | return skb; |
| 1721 | } |
| 1722 | } |
| 1723 | return NULL; |
| 1724 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1725 | EXPORT_SYMBOL(sock_wmalloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | |
| 1727 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | * Allocate a memory block from the socket's option memory buffer. |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1729 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1730 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1732 | if ((unsigned int)size <= sysctl_optmem_max && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
| 1734 | void *mem; |
| 1735 | /* First do the add, to avoid the race if kmalloc |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1736 | * might sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | */ |
| 1738 | atomic_add(size, &sk->sk_omem_alloc); |
| 1739 | mem = kmalloc(size, priority); |
| 1740 | if (mem) |
| 1741 | return mem; |
| 1742 | atomic_sub(size, &sk->sk_omem_alloc); |
| 1743 | } |
| 1744 | return NULL; |
| 1745 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1746 | EXPORT_SYMBOL(sock_kmalloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1748 | /* Free an option memory block. Note, we actually want the inline |
| 1749 | * here as this allows gcc to detect the nullify and fold away the |
| 1750 | * condition entirely. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | */ |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1752 | static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
| 1753 | const bool nullify) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | { |
David S. Miller | e53da5f | 2014-10-14 17:02:37 -0400 | [diff] [blame] | 1755 | if (WARN_ON_ONCE(!mem)) |
| 1756 | return; |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1757 | if (nullify) |
| 1758 | kzfree(mem); |
| 1759 | else |
| 1760 | kfree(mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | atomic_sub(size, &sk->sk_omem_alloc); |
| 1762 | } |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1763 | |
| 1764 | void sock_kfree_s(struct sock *sk, void *mem, int size) |
| 1765 | { |
| 1766 | __sock_kfree_s(sk, mem, size, false); |
| 1767 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1768 | EXPORT_SYMBOL(sock_kfree_s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1770 | void sock_kzfree_s(struct sock *sk, void *mem, int size) |
| 1771 | { |
| 1772 | __sock_kfree_s(sk, mem, size, true); |
| 1773 | } |
| 1774 | EXPORT_SYMBOL(sock_kzfree_s); |
| 1775 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
| 1777 | I think, these locks should be removed for datagram sockets. |
| 1778 | */ |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1779 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | { |
| 1781 | DEFINE_WAIT(wait); |
| 1782 | |
| 1783 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 1784 | for (;;) { |
| 1785 | if (!timeo) |
| 1786 | break; |
| 1787 | if (signal_pending(current)) |
| 1788 | break; |
| 1789 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1790 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
| 1792 | break; |
| 1793 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1794 | break; |
| 1795 | if (sk->sk_err) |
| 1796 | break; |
| 1797 | timeo = schedule_timeout(timeo); |
| 1798 | } |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1799 | finish_wait(sk_sleep(sk), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | return timeo; |
| 1801 | } |
| 1802 | |
| 1803 | |
| 1804 | /* |
| 1805 | * Generic send/receive buffer handlers |
| 1806 | */ |
| 1807 | |
Herbert Xu | 4cc7f68 | 2009-02-04 16:55:54 -0800 | [diff] [blame] | 1808 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
| 1809 | unsigned long data_len, int noblock, |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 1810 | int *errcode, int max_page_order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | { |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1812 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | long timeo; |
| 1814 | int err; |
| 1815 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | timeo = sock_sndtimeo(sk, noblock); |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1817 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | err = sock_error(sk); |
| 1819 | if (err != 0) |
| 1820 | goto failure; |
| 1821 | |
| 1822 | err = -EPIPE; |
| 1823 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1824 | goto failure; |
| 1825 | |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1826 | if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
| 1827 | break; |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 1828 | |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1829 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 1830 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 1831 | err = -EAGAIN; |
| 1832 | if (!timeo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | goto failure; |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1834 | if (signal_pending(current)) |
| 1835 | goto interrupted; |
| 1836 | timeo = sock_wait_for_wmem(sk, timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | } |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1838 | skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
| 1839 | errcode, sk->sk_allocation); |
| 1840 | if (skb) |
| 1841 | skb_set_owner_w(skb, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | return skb; |
| 1843 | |
| 1844 | interrupted: |
| 1845 | err = sock_intr_errno(timeo); |
| 1846 | failure: |
| 1847 | *errcode = err; |
| 1848 | return NULL; |
| 1849 | } |
Herbert Xu | 4cc7f68 | 2009-02-04 16:55:54 -0800 | [diff] [blame] | 1850 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1852 | 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] | 1853 | int noblock, int *errcode) |
| 1854 | { |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 1855 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1857 | EXPORT_SYMBOL(sock_alloc_send_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1859 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
| 1860 | #define SKB_FRAG_PAGE_ORDER get_order(32768) |
| 1861 | |
Eric Dumazet | 400dfd3 | 2013-10-17 16:27:07 -0700 | [diff] [blame] | 1862 | /** |
| 1863 | * skb_page_frag_refill - check that a page_frag contains enough room |
| 1864 | * @sz: minimum size of the fragment we want to get |
| 1865 | * @pfrag: pointer to page_frag |
Eric Dumazet | 82d5e2b | 2014-09-08 04:00:00 -0700 | [diff] [blame] | 1866 | * @gfp: priority for memory allocation |
Eric Dumazet | 400dfd3 | 2013-10-17 16:27:07 -0700 | [diff] [blame] | 1867 | * |
| 1868 | * Note: While this allocator tries to use high order pages, there is |
| 1869 | * no guarantee that allocations succeed. Therefore, @sz MUST be |
| 1870 | * less or equal than PAGE_SIZE. |
| 1871 | */ |
Eric Dumazet | d9b2938 | 2014-08-27 20:49:34 -0700 | [diff] [blame] | 1872 | bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1873 | { |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1874 | if (pfrag->page) { |
| 1875 | if (atomic_read(&pfrag->page->_count) == 1) { |
| 1876 | pfrag->offset = 0; |
| 1877 | return true; |
| 1878 | } |
Eric Dumazet | 400dfd3 | 2013-10-17 16:27:07 -0700 | [diff] [blame] | 1879 | if (pfrag->offset + sz <= pfrag->size) |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1880 | return true; |
| 1881 | put_page(pfrag->page); |
| 1882 | } |
| 1883 | |
Eric Dumazet | d9b2938 | 2014-08-27 20:49:34 -0700 | [diff] [blame] | 1884 | pfrag->offset = 0; |
| 1885 | if (SKB_FRAG_PAGE_ORDER) { |
| 1886 | pfrag->page = alloc_pages(gfp | __GFP_COMP | |
| 1887 | __GFP_NOWARN | __GFP_NORETRY, |
| 1888 | SKB_FRAG_PAGE_ORDER); |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1889 | if (likely(pfrag->page)) { |
Eric Dumazet | d9b2938 | 2014-08-27 20:49:34 -0700 | [diff] [blame] | 1890 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1891 | return true; |
| 1892 | } |
Eric Dumazet | d9b2938 | 2014-08-27 20:49:34 -0700 | [diff] [blame] | 1893 | } |
| 1894 | pfrag->page = alloc_page(gfp); |
| 1895 | if (likely(pfrag->page)) { |
| 1896 | pfrag->size = PAGE_SIZE; |
| 1897 | return true; |
| 1898 | } |
Eric Dumazet | 400dfd3 | 2013-10-17 16:27:07 -0700 | [diff] [blame] | 1899 | return false; |
| 1900 | } |
| 1901 | EXPORT_SYMBOL(skb_page_frag_refill); |
| 1902 | |
| 1903 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) |
| 1904 | { |
| 1905 | if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) |
| 1906 | return true; |
| 1907 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1908 | sk_enter_memory_pressure(sk); |
| 1909 | sk_stream_moderate_sndbuf(sk); |
| 1910 | return false; |
| 1911 | } |
| 1912 | EXPORT_SYMBOL(sk_page_frag_refill); |
| 1913 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | static void __lock_sock(struct sock *sk) |
Namhyung Kim | f39234d | 2010-09-08 03:48:48 +0000 | [diff] [blame] | 1915 | __releases(&sk->sk_lock.slock) |
| 1916 | __acquires(&sk->sk_lock.slock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | { |
| 1918 | DEFINE_WAIT(wait); |
| 1919 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1920 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
| 1922 | TASK_UNINTERRUPTIBLE); |
| 1923 | spin_unlock_bh(&sk->sk_lock.slock); |
| 1924 | schedule(); |
| 1925 | spin_lock_bh(&sk->sk_lock.slock); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1926 | if (!sock_owned_by_user(sk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1927 | break; |
| 1928 | } |
| 1929 | finish_wait(&sk->sk_lock.wq, &wait); |
| 1930 | } |
| 1931 | |
| 1932 | static void __release_sock(struct sock *sk) |
Namhyung Kim | f39234d | 2010-09-08 03:48:48 +0000 | [diff] [blame] | 1933 | __releases(&sk->sk_lock.slock) |
| 1934 | __acquires(&sk->sk_lock.slock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | { |
| 1936 | struct sk_buff *skb = sk->sk_backlog.head; |
| 1937 | |
| 1938 | do { |
| 1939 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
| 1940 | bh_unlock_sock(sk); |
| 1941 | |
| 1942 | do { |
| 1943 | struct sk_buff *next = skb->next; |
| 1944 | |
Eric Dumazet | e4cbb02 | 2012-04-30 16:07:09 +0000 | [diff] [blame] | 1945 | prefetch(next); |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 1946 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | skb->next = NULL; |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 1948 | sk_backlog_rcv(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | |
| 1950 | /* |
| 1951 | * We are in process context here with softirqs |
| 1952 | * disabled, use cond_resched_softirq() to preempt. |
| 1953 | * This is safe to do because we've taken the backlog |
| 1954 | * queue private: |
| 1955 | */ |
| 1956 | cond_resched_softirq(); |
| 1957 | |
| 1958 | skb = next; |
| 1959 | } while (skb != NULL); |
| 1960 | |
| 1961 | bh_lock_sock(sk); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1962 | } while ((skb = sk->sk_backlog.head) != NULL); |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 1963 | |
| 1964 | /* |
| 1965 | * Doing the zeroing here guarantee we can not loop forever |
| 1966 | * while a wild producer attempts to flood us. |
| 1967 | */ |
| 1968 | sk->sk_backlog.len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | } |
| 1970 | |
| 1971 | /** |
| 1972 | * sk_wait_data - wait for data to arrive at sk_receive_queue |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1973 | * @sk: sock to wait on |
| 1974 | * @timeo: for how long |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | * |
| 1976 | * Now socket state including sk->sk_err is changed only under lock, |
| 1977 | * hence we may omit checks after joining wait queue. |
| 1978 | * We check receive queue before schedule() only as optimization; |
| 1979 | * it is very likely that release_sock() added new data. |
| 1980 | */ |
| 1981 | int sk_wait_data(struct sock *sk, long *timeo) |
| 1982 | { |
| 1983 | int rc; |
| 1984 | DEFINE_WAIT(wait); |
| 1985 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1986 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
| 1988 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); |
| 1989 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1990 | finish_wait(sk_sleep(sk), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | return rc; |
| 1992 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1993 | EXPORT_SYMBOL(sk_wait_data); |
| 1994 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1995 | /** |
| 1996 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated |
| 1997 | * @sk: socket |
| 1998 | * @size: memory size to allocate |
| 1999 | * @kind: allocation type |
| 2000 | * |
| 2001 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means |
| 2002 | * rmem allocation. This function assumes that protocols which have |
| 2003 | * memory_pressure use sk_wmem_queued as write buffer accounting. |
| 2004 | */ |
| 2005 | int __sk_mem_schedule(struct sock *sk, int size, int kind) |
| 2006 | { |
| 2007 | struct proto *prot = sk->sk_prot; |
| 2008 | int amt = sk_mem_pages(size); |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 2009 | long allocated; |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 2010 | int parent_status = UNDER_LIMIT; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2011 | |
| 2012 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2013 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 2014 | allocated = sk_memory_allocated_add(sk, amt, &parent_status); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2015 | |
| 2016 | /* Under limit. */ |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 2017 | if (parent_status == UNDER_LIMIT && |
| 2018 | allocated <= sk_prot_mem_limits(sk, 0)) { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2019 | sk_leave_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2020 | return 1; |
| 2021 | } |
| 2022 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 2023 | /* Under pressure. (we or our parents) */ |
| 2024 | if ((parent_status > SOFT_LIMIT) || |
| 2025 | allocated > sk_prot_mem_limits(sk, 1)) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2026 | sk_enter_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2027 | |
Glauber Costa | e1aab16 | 2011-12-11 21:47:03 +0000 | [diff] [blame] | 2028 | /* Over hard limit (we or our parents) */ |
| 2029 | if ((parent_status == OVER_LIMIT) || |
| 2030 | (allocated > sk_prot_mem_limits(sk, 2))) |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2031 | goto suppress_allocation; |
| 2032 | |
| 2033 | /* guarantee minimum buffer size under pressure */ |
| 2034 | if (kind == SK_MEM_RECV) { |
| 2035 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) |
| 2036 | return 1; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2037 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2038 | } else { /* SK_MEM_SEND */ |
| 2039 | if (sk->sk_type == SOCK_STREAM) { |
| 2040 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) |
| 2041 | return 1; |
| 2042 | } else if (atomic_read(&sk->sk_wmem_alloc) < |
| 2043 | prot->sysctl_wmem[0]) |
| 2044 | return 1; |
| 2045 | } |
| 2046 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2047 | if (sk_has_memory_pressure(sk)) { |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 2048 | int alloc; |
| 2049 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2050 | if (!sk_under_memory_pressure(sk)) |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 2051 | return 1; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2052 | alloc = sk_sockets_allocated_read_positive(sk); |
| 2053 | if (sk_prot_mem_limits(sk, 2) > alloc * |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2054 | sk_mem_pages(sk->sk_wmem_queued + |
| 2055 | atomic_read(&sk->sk_rmem_alloc) + |
| 2056 | sk->sk_forward_alloc)) |
| 2057 | return 1; |
| 2058 | } |
| 2059 | |
| 2060 | suppress_allocation: |
| 2061 | |
| 2062 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { |
| 2063 | sk_stream_moderate_sndbuf(sk); |
| 2064 | |
| 2065 | /* Fail only if socket is _under_ its sndbuf. |
| 2066 | * In this case we cannot block, so that we have to fail. |
| 2067 | */ |
| 2068 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) |
| 2069 | return 1; |
| 2070 | } |
| 2071 | |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 2072 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
| 2073 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2074 | /* Alas. Undo changes. */ |
| 2075 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2076 | |
Glauber Costa | 0e90b31 | 2012-01-20 04:57:16 +0000 | [diff] [blame] | 2077 | sk_memory_allocated_sub(sk, amt); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2078 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2079 | return 0; |
| 2080 | } |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2081 | EXPORT_SYMBOL(__sk_mem_schedule); |
| 2082 | |
| 2083 | /** |
| 2084 | * __sk_reclaim - reclaim memory_allocated |
| 2085 | * @sk: socket |
| 2086 | */ |
| 2087 | void __sk_mem_reclaim(struct sock *sk) |
| 2088 | { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2089 | sk_memory_allocated_sub(sk, |
Glauber Costa | 0e90b31 | 2012-01-20 04:57:16 +0000 | [diff] [blame] | 2090 | sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2091 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; |
| 2092 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2093 | if (sk_under_memory_pressure(sk) && |
| 2094 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) |
| 2095 | sk_leave_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2096 | } |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2097 | EXPORT_SYMBOL(__sk_mem_reclaim); |
| 2098 | |
| 2099 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | /* |
| 2101 | * Set of default routines for initialising struct proto_ops when |
| 2102 | * the protocol does not support a particular function. In certain |
| 2103 | * cases where it makes no sense for a protocol to have a "do nothing" |
| 2104 | * function, some default processing is provided. |
| 2105 | */ |
| 2106 | |
| 2107 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) |
| 2108 | { |
| 2109 | return -EOPNOTSUPP; |
| 2110 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2111 | EXPORT_SYMBOL(sock_no_bind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2113 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | int len, int flags) |
| 2115 | { |
| 2116 | return -EOPNOTSUPP; |
| 2117 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2118 | EXPORT_SYMBOL(sock_no_connect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | |
| 2120 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) |
| 2121 | { |
| 2122 | return -EOPNOTSUPP; |
| 2123 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2124 | EXPORT_SYMBOL(sock_no_socketpair); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | |
| 2126 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) |
| 2127 | { |
| 2128 | return -EOPNOTSUPP; |
| 2129 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2130 | EXPORT_SYMBOL(sock_no_accept); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2132 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | int *len, int peer) |
| 2134 | { |
| 2135 | return -EOPNOTSUPP; |
| 2136 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2137 | EXPORT_SYMBOL(sock_no_getname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2139 | 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] | 2140 | { |
| 2141 | return 0; |
| 2142 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2143 | EXPORT_SYMBOL(sock_no_poll); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | |
| 2145 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 2146 | { |
| 2147 | return -EOPNOTSUPP; |
| 2148 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2149 | EXPORT_SYMBOL(sock_no_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | |
| 2151 | int sock_no_listen(struct socket *sock, int backlog) |
| 2152 | { |
| 2153 | return -EOPNOTSUPP; |
| 2154 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2155 | EXPORT_SYMBOL(sock_no_listen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | |
| 2157 | int sock_no_shutdown(struct socket *sock, int how) |
| 2158 | { |
| 2159 | return -EOPNOTSUPP; |
| 2160 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2161 | EXPORT_SYMBOL(sock_no_shutdown); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | |
| 2163 | int sock_no_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2164 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | { |
| 2166 | return -EOPNOTSUPP; |
| 2167 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2168 | EXPORT_SYMBOL(sock_no_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2169 | |
| 2170 | int sock_no_getsockopt(struct socket *sock, int level, int optname, |
| 2171 | char __user *optval, int __user *optlen) |
| 2172 | { |
| 2173 | return -EOPNOTSUPP; |
| 2174 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2175 | EXPORT_SYMBOL(sock_no_getsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2177 | int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | { |
| 2179 | return -EOPNOTSUPP; |
| 2180 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2181 | EXPORT_SYMBOL(sock_no_sendmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2183 | int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
| 2184 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | { |
| 2186 | return -EOPNOTSUPP; |
| 2187 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2188 | EXPORT_SYMBOL(sock_no_recvmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | |
| 2190 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) |
| 2191 | { |
| 2192 | /* Mirror missing mmap method error code */ |
| 2193 | return -ENODEV; |
| 2194 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2195 | EXPORT_SYMBOL(sock_no_mmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | |
| 2197 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) |
| 2198 | { |
| 2199 | ssize_t res; |
| 2200 | struct msghdr msg = {.msg_flags = flags}; |
| 2201 | struct kvec iov; |
| 2202 | char *kaddr = kmap(page); |
| 2203 | iov.iov_base = kaddr + offset; |
| 2204 | iov.iov_len = size; |
| 2205 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); |
| 2206 | kunmap(page); |
| 2207 | return res; |
| 2208 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2209 | EXPORT_SYMBOL(sock_no_sendpage); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | |
| 2211 | /* |
| 2212 | * Default Socket Callbacks |
| 2213 | */ |
| 2214 | |
| 2215 | static void sock_def_wakeup(struct sock *sk) |
| 2216 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2217 | struct socket_wq *wq; |
| 2218 | |
| 2219 | rcu_read_lock(); |
| 2220 | wq = rcu_dereference(sk->sk_wq); |
| 2221 | if (wq_has_sleeper(wq)) |
| 2222 | wake_up_interruptible_all(&wq->wait); |
| 2223 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | } |
| 2225 | |
| 2226 | static void sock_def_error_report(struct sock *sk) |
| 2227 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2228 | struct socket_wq *wq; |
| 2229 | |
| 2230 | rcu_read_lock(); |
| 2231 | wq = rcu_dereference(sk->sk_wq); |
| 2232 | if (wq_has_sleeper(wq)) |
| 2233 | wake_up_interruptible_poll(&wq->wait, POLLERR); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2234 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2235 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | } |
| 2237 | |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 2238 | static void sock_def_readable(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2240 | struct socket_wq *wq; |
| 2241 | |
| 2242 | rcu_read_lock(); |
| 2243 | wq = rcu_dereference(sk->sk_wq); |
| 2244 | if (wq_has_sleeper(wq)) |
Eric Dumazet | 2c6607c | 2011-01-06 10:54:29 -0800 | [diff] [blame] | 2245 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
Davide Libenzi | 37e5540 | 2009-03-31 15:24:21 -0700 | [diff] [blame] | 2246 | POLLRDNORM | POLLRDBAND); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2247 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2248 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | } |
| 2250 | |
| 2251 | static void sock_def_write_space(struct sock *sk) |
| 2252 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2253 | struct socket_wq *wq; |
| 2254 | |
| 2255 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | |
| 2257 | /* Do not wake up a writer until he can make "significant" |
| 2258 | * progress. --DaveM |
| 2259 | */ |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 2260 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2261 | wq = rcu_dereference(sk->sk_wq); |
| 2262 | if (wq_has_sleeper(wq)) |
| 2263 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
Davide Libenzi | 37e5540 | 2009-03-31 15:24:21 -0700 | [diff] [blame] | 2264 | POLLWRNORM | POLLWRBAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2265 | |
| 2266 | /* Should agree with poll, otherwise some programs break */ |
| 2267 | if (sock_writeable(sk)) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2268 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | } |
| 2270 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2271 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | } |
| 2273 | |
| 2274 | static void sock_def_destruct(struct sock *sk) |
| 2275 | { |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 2276 | kfree(sk->sk_protinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2277 | } |
| 2278 | |
| 2279 | void sk_send_sigurg(struct sock *sk) |
| 2280 | { |
| 2281 | if (sk->sk_socket && sk->sk_socket->file) |
| 2282 | if (send_sigurg(&sk->sk_socket->file->f_owner)) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2283 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2284 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2285 | EXPORT_SYMBOL(sk_send_sigurg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | |
| 2287 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, |
| 2288 | unsigned long expires) |
| 2289 | { |
| 2290 | if (!mod_timer(timer, expires)) |
| 2291 | sock_hold(sk); |
| 2292 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | EXPORT_SYMBOL(sk_reset_timer); |
| 2294 | |
| 2295 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) |
| 2296 | { |
Ying Xue | 25cc4ae | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 2297 | if (del_timer(timer)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | __sock_put(sk); |
| 2299 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | EXPORT_SYMBOL(sk_stop_timer); |
| 2301 | |
| 2302 | void sock_init_data(struct socket *sock, struct sock *sk) |
| 2303 | { |
| 2304 | skb_queue_head_init(&sk->sk_receive_queue); |
| 2305 | skb_queue_head_init(&sk->sk_write_queue); |
| 2306 | skb_queue_head_init(&sk->sk_error_queue); |
| 2307 | |
| 2308 | sk->sk_send_head = NULL; |
| 2309 | |
| 2310 | init_timer(&sk->sk_timer); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | sk->sk_allocation = GFP_KERNEL; |
| 2313 | sk->sk_rcvbuf = sysctl_rmem_default; |
| 2314 | sk->sk_sndbuf = sysctl_wmem_default; |
| 2315 | sk->sk_state = TCP_CLOSE; |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 2316 | sk_set_socket(sk, sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | |
| 2318 | sock_set_flag(sk, SOCK_ZAPPED); |
| 2319 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 2320 | if (sock) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | sk->sk_type = sock->type; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2322 | sk->sk_wq = sock->wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | sock->sk = sk; |
| 2324 | } else |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2325 | sk->sk_wq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2326 | |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 2327 | spin_lock_init(&sk->sk_dst_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | rwlock_init(&sk->sk_callback_lock); |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 2329 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
| 2330 | af_callback_keys + sk->sk_family, |
| 2331 | af_family_clock_key_strings[sk->sk_family]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | |
| 2333 | sk->sk_state_change = sock_def_wakeup; |
| 2334 | sk->sk_data_ready = sock_def_readable; |
| 2335 | sk->sk_write_space = sock_def_write_space; |
| 2336 | sk->sk_error_report = sock_def_error_report; |
| 2337 | sk->sk_destruct = sock_def_destruct; |
| 2338 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2339 | sk->sk_frag.page = NULL; |
| 2340 | sk->sk_frag.offset = 0; |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 2341 | sk->sk_peek_off = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 2343 | sk->sk_peer_pid = NULL; |
| 2344 | sk->sk_peer_cred = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2345 | sk->sk_write_pending = 0; |
| 2346 | sk->sk_rcvlowat = 1; |
| 2347 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| 2348 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
| 2349 | |
Eric Dumazet | f37f0af | 2008-04-13 21:39:26 -0700 | [diff] [blame] | 2350 | sk->sk_stamp = ktime_set(-1L, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | |
Cong Wang | e0d1095 | 2013-08-01 11:10:25 +0800 | [diff] [blame] | 2352 | #ifdef CONFIG_NET_RX_BUSY_POLL |
Eliezer Tamir | 0602129 | 2013-06-10 11:39:50 +0300 | [diff] [blame] | 2353 | sk->sk_napi_id = 0; |
Eliezer Tamir | 64b0dc5 | 2013-07-10 17:13:36 +0300 | [diff] [blame] | 2354 | sk->sk_ll_usec = sysctl_net_busy_read; |
Eliezer Tamir | 0602129 | 2013-06-10 11:39:50 +0300 | [diff] [blame] | 2355 | #endif |
| 2356 | |
Eric Dumazet | 62748f3 | 2013-09-24 08:20:52 -0700 | [diff] [blame] | 2357 | sk->sk_max_pacing_rate = ~0U; |
Eric Dumazet | 7eec417 | 2013-10-08 15:16:00 -0700 | [diff] [blame] | 2358 | sk->sk_pacing_rate = ~0U; |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 2359 | /* |
| 2360 | * Before updating sk_refcnt, we must commit prior changes to memory |
| 2361 | * (Documentation/RCU/rculist_nulls.txt for details) |
| 2362 | */ |
| 2363 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2364 | atomic_set(&sk->sk_refcnt, 1); |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 2365 | atomic_set(&sk->sk_drops, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2366 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2367 | EXPORT_SYMBOL(sock_init_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 2369 | void lock_sock_nested(struct sock *sk, int subclass) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | { |
| 2371 | might_sleep(); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2372 | spin_lock_bh(&sk->sk_lock.slock); |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 2373 | if (sk->sk_lock.owned) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | __lock_sock(sk); |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 2375 | sk->sk_lock.owned = 1; |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2376 | spin_unlock(&sk->sk_lock.slock); |
| 2377 | /* |
| 2378 | * The sk_lock has mutex_lock() semantics here: |
| 2379 | */ |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 2380 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2381 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | } |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 2383 | EXPORT_SYMBOL(lock_sock_nested); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2384 | |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 2385 | void release_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2386 | { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2387 | /* |
| 2388 | * The sk_lock has mutex_unlock() semantics: |
| 2389 | */ |
| 2390 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
| 2391 | |
| 2392 | spin_lock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | if (sk->sk_backlog.tail) |
| 2394 | __release_sock(sk); |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 2395 | |
Eric Dumazet | c3f9b01 | 2014-03-10 09:50:11 -0700 | [diff] [blame] | 2396 | /* Warning : release_cb() might need to release sk ownership, |
| 2397 | * ie call sock_release_ownership(sk) before us. |
| 2398 | */ |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 2399 | if (sk->sk_prot->release_cb) |
| 2400 | sk->sk_prot->release_cb(sk); |
| 2401 | |
Eric Dumazet | c3f9b01 | 2014-03-10 09:50:11 -0700 | [diff] [blame] | 2402 | sock_release_ownership(sk); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2403 | if (waitqueue_active(&sk->sk_lock.wq)) |
| 2404 | wake_up(&sk->sk_lock.wq); |
| 2405 | spin_unlock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | } |
| 2407 | EXPORT_SYMBOL(release_sock); |
| 2408 | |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 2409 | /** |
| 2410 | * lock_sock_fast - fast version of lock_sock |
| 2411 | * @sk: socket |
| 2412 | * |
| 2413 | * This version should be used for very small section, where process wont block |
| 2414 | * return false if fast path is taken |
| 2415 | * sk_lock.slock locked, owned = 0, BH disabled |
| 2416 | * return true if slow path is taken |
| 2417 | * sk_lock.slock unlocked, owned = 1, BH enabled |
| 2418 | */ |
| 2419 | bool lock_sock_fast(struct sock *sk) |
| 2420 | { |
| 2421 | might_sleep(); |
| 2422 | spin_lock_bh(&sk->sk_lock.slock); |
| 2423 | |
| 2424 | if (!sk->sk_lock.owned) |
| 2425 | /* |
| 2426 | * Note : We must disable BH |
| 2427 | */ |
| 2428 | return false; |
| 2429 | |
| 2430 | __lock_sock(sk); |
| 2431 | sk->sk_lock.owned = 1; |
| 2432 | spin_unlock(&sk->sk_lock.slock); |
| 2433 | /* |
| 2434 | * The sk_lock has mutex_lock() semantics here: |
| 2435 | */ |
| 2436 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); |
| 2437 | local_bh_enable(); |
| 2438 | return true; |
| 2439 | } |
| 2440 | EXPORT_SYMBOL(lock_sock_fast); |
| 2441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2443 | { |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2444 | struct timeval tv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2446 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2447 | tv = ktime_to_timeval(sk->sk_stamp); |
| 2448 | if (tv.tv_sec == -1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2449 | return -ENOENT; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2450 | if (tv.tv_sec == 0) { |
| 2451 | sk->sk_stamp = ktime_get_real(); |
| 2452 | tv = ktime_to_timeval(sk->sk_stamp); |
| 2453 | } |
| 2454 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2455 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | EXPORT_SYMBOL(sock_get_timestamp); |
| 2457 | |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 2458 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
| 2459 | { |
| 2460 | struct timespec ts; |
| 2461 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2462 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 2463 | ts = ktime_to_timespec(sk->sk_stamp); |
| 2464 | if (ts.tv_sec == -1) |
| 2465 | return -ENOENT; |
| 2466 | if (ts.tv_sec == 0) { |
| 2467 | sk->sk_stamp = ktime_get_real(); |
| 2468 | ts = ktime_to_timespec(sk->sk_stamp); |
| 2469 | } |
| 2470 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; |
| 2471 | } |
| 2472 | EXPORT_SYMBOL(sock_get_timestampns); |
| 2473 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2474 | void sock_enable_timestamp(struct sock *sk, int flag) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2475 | { |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2476 | if (!sock_flag(sk, flag)) { |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 2477 | unsigned long previous_flags = sk->sk_flags; |
| 2478 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2479 | sock_set_flag(sk, flag); |
| 2480 | /* |
| 2481 | * we just set one of the two flags which require net |
| 2482 | * time stamping, but time stamping might have been on |
| 2483 | * already because of the other one |
| 2484 | */ |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 2485 | if (!(previous_flags & SK_FLAGS_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2486 | net_enable_timestamp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | } |
| 2488 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2489 | |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2490 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
| 2491 | int level, int type) |
| 2492 | { |
| 2493 | struct sock_exterr_skb *serr; |
Willem de Bruijn | 364a9e9 | 2014-08-31 21:30:27 -0400 | [diff] [blame] | 2494 | struct sk_buff *skb; |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2495 | int copied, err; |
| 2496 | |
| 2497 | err = -EAGAIN; |
Willem de Bruijn | 364a9e9 | 2014-08-31 21:30:27 -0400 | [diff] [blame] | 2498 | skb = sock_dequeue_err_skb(sk); |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2499 | if (skb == NULL) |
| 2500 | goto out; |
| 2501 | |
| 2502 | copied = skb->len; |
| 2503 | if (copied > len) { |
| 2504 | msg->msg_flags |= MSG_TRUNC; |
| 2505 | copied = len; |
| 2506 | } |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 2507 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2508 | if (err) |
| 2509 | goto out_free_skb; |
| 2510 | |
| 2511 | sock_recv_timestamp(msg, sk, skb); |
| 2512 | |
| 2513 | serr = SKB_EXT_ERR(skb); |
| 2514 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); |
| 2515 | |
| 2516 | msg->msg_flags |= MSG_ERRQUEUE; |
| 2517 | err = copied; |
| 2518 | |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2519 | out_free_skb: |
| 2520 | kfree_skb(skb); |
| 2521 | out: |
| 2522 | return err; |
| 2523 | } |
| 2524 | EXPORT_SYMBOL(sock_recv_errqueue); |
| 2525 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2526 | /* |
| 2527 | * Get a socket option on an socket. |
| 2528 | * |
| 2529 | * FIX: POSIX 1003.1g is very ambiguous here. It states that |
| 2530 | * asynchronous errors should be reported by getsockopt. We assume |
| 2531 | * this means if you specify SO_ERROR (otherwise whats the point of it). |
| 2532 | */ |
| 2533 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 2534 | char __user *optval, int __user *optlen) |
| 2535 | { |
| 2536 | struct sock *sk = sock->sk; |
| 2537 | |
| 2538 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 2539 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | EXPORT_SYMBOL(sock_common_getsockopt); |
| 2541 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2542 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2543 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 2544 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2545 | { |
| 2546 | struct sock *sk = sock->sk; |
| 2547 | |
Johannes Berg | 1e51f95 | 2007-03-06 13:44:06 -0800 | [diff] [blame] | 2548 | if (sk->sk_prot->compat_getsockopt != NULL) |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2549 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
| 2550 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2551 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 2552 | } |
| 2553 | EXPORT_SYMBOL(compat_sock_common_getsockopt); |
| 2554 | #endif |
| 2555 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2556 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
| 2557 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2558 | { |
| 2559 | struct sock *sk = sock->sk; |
| 2560 | int addr_len = 0; |
| 2561 | int err; |
| 2562 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2563 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2564 | flags & ~MSG_DONTWAIT, &addr_len); |
| 2565 | if (err >= 0) |
| 2566 | msg->msg_namelen = addr_len; |
| 2567 | return err; |
| 2568 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2569 | EXPORT_SYMBOL(sock_common_recvmsg); |
| 2570 | |
| 2571 | /* |
| 2572 | * Set socket options on an inet socket. |
| 2573 | */ |
| 2574 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2575 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2576 | { |
| 2577 | struct sock *sk = sock->sk; |
| 2578 | |
| 2579 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 2580 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2581 | EXPORT_SYMBOL(sock_common_setsockopt); |
| 2582 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2583 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2584 | 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] | 2585 | char __user *optval, unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2586 | { |
| 2587 | struct sock *sk = sock->sk; |
| 2588 | |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2589 | if (sk->sk_prot->compat_setsockopt != NULL) |
| 2590 | return sk->sk_prot->compat_setsockopt(sk, level, optname, |
| 2591 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2592 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 2593 | } |
| 2594 | EXPORT_SYMBOL(compat_sock_common_setsockopt); |
| 2595 | #endif |
| 2596 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2597 | void sk_common_release(struct sock *sk) |
| 2598 | { |
| 2599 | if (sk->sk_prot->destroy) |
| 2600 | sk->sk_prot->destroy(sk); |
| 2601 | |
| 2602 | /* |
| 2603 | * Observation: when sock_common_release is called, processes have |
| 2604 | * no access to socket. But net still has. |
| 2605 | * Step one, detach it from networking: |
| 2606 | * |
| 2607 | * A. Remove from hash tables. |
| 2608 | */ |
| 2609 | |
| 2610 | sk->sk_prot->unhash(sk); |
| 2611 | |
| 2612 | /* |
| 2613 | * In this point socket cannot receive new packets, but it is possible |
| 2614 | * that some packets are in flight because some CPU runs receiver and |
| 2615 | * did hash table lookup before we unhashed socket. They will achieve |
| 2616 | * receive queue and will be purged by socket destructor. |
| 2617 | * |
| 2618 | * Also we still have packets pending on receive queue and probably, |
| 2619 | * our own packets waiting in device queues. sock_destroy will drain |
| 2620 | * receive queue, but transmitted packets will delay socket destruction |
| 2621 | * until the last reference will be released. |
| 2622 | */ |
| 2623 | |
| 2624 | sock_orphan(sk); |
| 2625 | |
| 2626 | xfrm_sk_free_policy(sk); |
| 2627 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 2628 | sk_refcnt_debug_release(sk); |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2629 | |
| 2630 | if (sk->sk_frag.page) { |
| 2631 | put_page(sk->sk_frag.page); |
| 2632 | sk->sk_frag.page = NULL; |
| 2633 | } |
| 2634 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2635 | sock_put(sk); |
| 2636 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2637 | EXPORT_SYMBOL(sk_common_release); |
| 2638 | |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2639 | #ifdef CONFIG_PROC_FS |
| 2640 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2641 | struct prot_inuse { |
| 2642 | int val[PROTO_INUSE_NR]; |
| 2643 | }; |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2644 | |
| 2645 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2646 | |
| 2647 | #ifdef CONFIG_NET_NS |
| 2648 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
| 2649 | { |
Eric Dumazet | d6d9ca0 | 2010-07-19 10:48:49 +0000 | [diff] [blame] | 2650 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2651 | } |
| 2652 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| 2653 | |
| 2654 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
| 2655 | { |
| 2656 | int cpu, idx = prot->inuse_idx; |
| 2657 | int res = 0; |
| 2658 | |
| 2659 | for_each_possible_cpu(cpu) |
| 2660 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; |
| 2661 | |
| 2662 | return res >= 0 ? res : 0; |
| 2663 | } |
| 2664 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
| 2665 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2666 | static int __net_init sock_inuse_init_net(struct net *net) |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2667 | { |
| 2668 | net->core.inuse = alloc_percpu(struct prot_inuse); |
| 2669 | return net->core.inuse ? 0 : -ENOMEM; |
| 2670 | } |
| 2671 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2672 | static void __net_exit sock_inuse_exit_net(struct net *net) |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2673 | { |
| 2674 | free_percpu(net->core.inuse); |
| 2675 | } |
| 2676 | |
| 2677 | static struct pernet_operations net_inuse_ops = { |
| 2678 | .init = sock_inuse_init_net, |
| 2679 | .exit = sock_inuse_exit_net, |
| 2680 | }; |
| 2681 | |
| 2682 | static __init int net_inuse_init(void) |
| 2683 | { |
| 2684 | if (register_pernet_subsys(&net_inuse_ops)) |
| 2685 | panic("Cannot initialize net inuse counters"); |
| 2686 | |
| 2687 | return 0; |
| 2688 | } |
| 2689 | |
| 2690 | core_initcall(net_inuse_init); |
| 2691 | #else |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2692 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
| 2693 | |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 2694 | 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] | 2695 | { |
Eric Dumazet | d6d9ca0 | 2010-07-19 10:48:49 +0000 | [diff] [blame] | 2696 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2697 | } |
| 2698 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| 2699 | |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 2700 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2701 | { |
| 2702 | int cpu, idx = prot->inuse_idx; |
| 2703 | int res = 0; |
| 2704 | |
| 2705 | for_each_possible_cpu(cpu) |
| 2706 | res += per_cpu(prot_inuse, cpu).val[idx]; |
| 2707 | |
| 2708 | return res >= 0 ? res : 0; |
| 2709 | } |
| 2710 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2711 | #endif |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2712 | |
| 2713 | static void assign_proto_idx(struct proto *prot) |
| 2714 | { |
| 2715 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); |
| 2716 | |
| 2717 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 2718 | pr_err("PROTO_INUSE_NR exhausted\n"); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2719 | return; |
| 2720 | } |
| 2721 | |
| 2722 | set_bit(prot->inuse_idx, proto_inuse_idx); |
| 2723 | } |
| 2724 | |
| 2725 | static void release_proto_idx(struct proto *prot) |
| 2726 | { |
| 2727 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) |
| 2728 | clear_bit(prot->inuse_idx, proto_inuse_idx); |
| 2729 | } |
| 2730 | #else |
| 2731 | static inline void assign_proto_idx(struct proto *prot) |
| 2732 | { |
| 2733 | } |
| 2734 | |
| 2735 | static inline void release_proto_idx(struct proto *prot) |
| 2736 | { |
| 2737 | } |
| 2738 | #endif |
| 2739 | |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2740 | static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
| 2741 | { |
| 2742 | if (!rsk_prot) |
| 2743 | return; |
| 2744 | kfree(rsk_prot->slab_name); |
| 2745 | rsk_prot->slab_name = NULL; |
| 2746 | if (rsk_prot->slab) { |
| 2747 | kmem_cache_destroy(rsk_prot->slab); |
| 2748 | rsk_prot->slab = NULL; |
| 2749 | } |
| 2750 | } |
| 2751 | |
| 2752 | static int req_prot_init(const struct proto *prot) |
| 2753 | { |
| 2754 | struct request_sock_ops *rsk_prot = prot->rsk_prot; |
| 2755 | |
| 2756 | if (!rsk_prot) |
| 2757 | return 0; |
| 2758 | |
| 2759 | rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", |
| 2760 | prot->name); |
| 2761 | if (!rsk_prot->slab_name) |
| 2762 | return -ENOMEM; |
| 2763 | |
| 2764 | rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, |
| 2765 | rsk_prot->obj_size, 0, |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 2766 | 0, NULL); |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2767 | |
| 2768 | if (!rsk_prot->slab) { |
| 2769 | pr_crit("%s: Can't create request sock SLAB cache!\n", |
| 2770 | prot->name); |
| 2771 | return -ENOMEM; |
| 2772 | } |
| 2773 | return 0; |
| 2774 | } |
| 2775 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2776 | int proto_register(struct proto *prot, int alloc_slab) |
| 2777 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2778 | if (alloc_slab) { |
| 2779 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 2780 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
| 2781 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2782 | |
| 2783 | if (prot->slab == NULL) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 2784 | pr_crit("%s: Can't create sock SLAB cache!\n", |
| 2785 | prot->name); |
Pavel Emelyanov | 60e7663 | 2008-03-28 16:39:10 -0700 | [diff] [blame] | 2786 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2788 | |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2789 | if (req_prot_init(prot)) |
| 2790 | goto out_free_request_sock_slab; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2791 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2792 | if (prot->twsk_prot != NULL) { |
Alexey Dobriyan | faf2342 | 2010-02-17 09:34:12 +0000 | [diff] [blame] | 2793 | 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] | 2794 | |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2795 | if (prot->twsk_prot->twsk_slab_name == NULL) |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2796 | goto out_free_request_sock_slab; |
| 2797 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2798 | prot->twsk_prot->twsk_slab = |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2799 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2800 | prot->twsk_prot->twsk_obj_size, |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2801 | 0, |
Eric Dumazet | 52db70d | 2015-04-10 06:07:18 -0700 | [diff] [blame] | 2802 | prot->slab_flags, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2803 | NULL); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2804 | if (prot->twsk_prot->twsk_slab == NULL) |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2805 | goto out_free_timewait_sock_slab_name; |
| 2806 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2807 | } |
| 2808 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2809 | mutex_lock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2810 | list_add(&prot->node, &proto_list); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2811 | assign_proto_idx(prot); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2812 | mutex_unlock(&proto_list_mutex); |
Pavel Emelyanov | b733c00 | 2007-11-07 02:23:38 -0800 | [diff] [blame] | 2813 | return 0; |
| 2814 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2815 | out_free_timewait_sock_slab_name: |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2816 | kfree(prot->twsk_prot->twsk_slab_name); |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2817 | out_free_request_sock_slab: |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2818 | req_prot_cleanup(prot->rsk_prot); |
| 2819 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2820 | kmem_cache_destroy(prot->slab); |
| 2821 | prot->slab = NULL; |
Pavel Emelyanov | b733c00 | 2007-11-07 02:23:38 -0800 | [diff] [blame] | 2822 | out: |
| 2823 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2824 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2825 | EXPORT_SYMBOL(proto_register); |
| 2826 | |
| 2827 | void proto_unregister(struct proto *prot) |
| 2828 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2829 | mutex_lock(&proto_list_mutex); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2830 | release_proto_idx(prot); |
Patrick McHardy | 0a3f435 | 2005-09-06 19:47:50 -0700 | [diff] [blame] | 2831 | list_del(&prot->node); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2832 | mutex_unlock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2833 | |
| 2834 | if (prot->slab != NULL) { |
| 2835 | kmem_cache_destroy(prot->slab); |
| 2836 | prot->slab = NULL; |
| 2837 | } |
| 2838 | |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2839 | req_prot_cleanup(prot->rsk_prot); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2840 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2841 | 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] | 2842 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2843 | kfree(prot->twsk_prot->twsk_slab_name); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2844 | prot->twsk_prot->twsk_slab = NULL; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2845 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2846 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2847 | EXPORT_SYMBOL(proto_unregister); |
| 2848 | |
| 2849 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2850 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2851 | __acquires(proto_list_mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2852 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2853 | mutex_lock(&proto_list_mutex); |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2854 | return seq_list_start_head(&proto_list, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2855 | } |
| 2856 | |
| 2857 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2858 | { |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2859 | return seq_list_next(v, &proto_list, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2860 | } |
| 2861 | |
| 2862 | static void proto_seq_stop(struct seq_file *seq, void *v) |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2863 | __releases(proto_list_mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2864 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2865 | mutex_unlock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2866 | } |
| 2867 | |
| 2868 | static char proto_method_implemented(const void *method) |
| 2869 | { |
| 2870 | return method == NULL ? 'n' : 'y'; |
| 2871 | } |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2872 | static long sock_prot_memory_allocated(struct proto *proto) |
| 2873 | { |
Jeffrin Jose | cb75a36 | 2012-04-25 19:17:29 +0530 | [diff] [blame] | 2874 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2875 | } |
| 2876 | |
| 2877 | static char *sock_prot_memory_pressure(struct proto *proto) |
| 2878 | { |
| 2879 | return proto->memory_pressure != NULL ? |
| 2880 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; |
| 2881 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2882 | |
| 2883 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) |
| 2884 | { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2885 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 2886 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
| 2888 | proto->name, |
| 2889 | proto->obj_size, |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2890 | sock_prot_inuse_get(seq_file_net(seq), proto), |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2891 | sock_prot_memory_allocated(proto), |
| 2892 | sock_prot_memory_pressure(proto), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2893 | proto->max_header, |
| 2894 | proto->slab == NULL ? "no" : "yes", |
| 2895 | module_name(proto->owner), |
| 2896 | proto_method_implemented(proto->close), |
| 2897 | proto_method_implemented(proto->connect), |
| 2898 | proto_method_implemented(proto->disconnect), |
| 2899 | proto_method_implemented(proto->accept), |
| 2900 | proto_method_implemented(proto->ioctl), |
| 2901 | proto_method_implemented(proto->init), |
| 2902 | proto_method_implemented(proto->destroy), |
| 2903 | proto_method_implemented(proto->shutdown), |
| 2904 | proto_method_implemented(proto->setsockopt), |
| 2905 | proto_method_implemented(proto->getsockopt), |
| 2906 | proto_method_implemented(proto->sendmsg), |
| 2907 | proto_method_implemented(proto->recvmsg), |
| 2908 | proto_method_implemented(proto->sendpage), |
| 2909 | proto_method_implemented(proto->bind), |
| 2910 | proto_method_implemented(proto->backlog_rcv), |
| 2911 | proto_method_implemented(proto->hash), |
| 2912 | proto_method_implemented(proto->unhash), |
| 2913 | proto_method_implemented(proto->get_port), |
| 2914 | proto_method_implemented(proto->enter_memory_pressure)); |
| 2915 | } |
| 2916 | |
| 2917 | static int proto_seq_show(struct seq_file *seq, void *v) |
| 2918 | { |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2919 | if (v == &proto_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2920 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
| 2921 | "protocol", |
| 2922 | "size", |
| 2923 | "sockets", |
| 2924 | "memory", |
| 2925 | "press", |
| 2926 | "maxhdr", |
| 2927 | "slab", |
| 2928 | "module", |
| 2929 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); |
| 2930 | else |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2931 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2932 | return 0; |
| 2933 | } |
| 2934 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 2935 | static const struct seq_operations proto_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2936 | .start = proto_seq_start, |
| 2937 | .next = proto_seq_next, |
| 2938 | .stop = proto_seq_stop, |
| 2939 | .show = proto_seq_show, |
| 2940 | }; |
| 2941 | |
| 2942 | static int proto_seq_open(struct inode *inode, struct file *file) |
| 2943 | { |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2944 | return seq_open_net(inode, file, &proto_seq_ops, |
| 2945 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2946 | } |
| 2947 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 2948 | static const struct file_operations proto_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2949 | .owner = THIS_MODULE, |
| 2950 | .open = proto_seq_open, |
| 2951 | .read = seq_read, |
| 2952 | .llseek = seq_lseek, |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2953 | .release = seq_release_net, |
| 2954 | }; |
| 2955 | |
| 2956 | static __net_init int proto_init_net(struct net *net) |
| 2957 | { |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 2958 | if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2959 | return -ENOMEM; |
| 2960 | |
| 2961 | return 0; |
| 2962 | } |
| 2963 | |
| 2964 | static __net_exit void proto_exit_net(struct net *net) |
| 2965 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 2966 | remove_proc_entry("protocols", net->proc_net); |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2967 | } |
| 2968 | |
| 2969 | |
| 2970 | static __net_initdata struct pernet_operations proto_net_ops = { |
| 2971 | .init = proto_init_net, |
| 2972 | .exit = proto_exit_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2973 | }; |
| 2974 | |
| 2975 | static int __init proto_init(void) |
| 2976 | { |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 2977 | return register_pernet_subsys(&proto_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2978 | } |
| 2979 | |
| 2980 | subsys_initcall(proto_init); |
| 2981 | |
| 2982 | #endif /* PROC_FS */ |