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> |
Craig Gallek | eb4cb00 | 2015-06-15 11:26:18 -0400 | [diff] [blame] | 134 | #include <linux/sock_diag.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
| 136 | #include <linux/filter.h> |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 137 | #include <net/sock_reuseport.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 139 | #include <trace/events/sock.h> |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | #include <net/tcp.h> |
Eliezer Tamir | 076bb0c | 2013-07-10 17:13:17 +0300 | [diff] [blame] | 142 | #include <net/busy_poll.h> |
Eliezer Tamir | 0602129 | 2013-06-10 11:39:50 +0300 | [diff] [blame] | 143 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 144 | static DEFINE_MUTEX(proto_list_mutex); |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 145 | static LIST_HEAD(proto_list); |
| 146 | |
Eric W. Biederman | a3b299d | 2014-04-23 14:26:56 -0700 | [diff] [blame] | 147 | /** |
| 148 | * sk_ns_capable - General socket capability test |
| 149 | * @sk: Socket to use a capability on or through |
| 150 | * @user_ns: The user namespace of the capability to use |
| 151 | * @cap: The capability to use |
| 152 | * |
| 153 | * Test to see if the opener of the socket had when the socket was |
| 154 | * created and the current process has the capability @cap in the user |
| 155 | * namespace @user_ns. |
| 156 | */ |
| 157 | bool sk_ns_capable(const struct sock *sk, |
| 158 | struct user_namespace *user_ns, int cap) |
| 159 | { |
| 160 | return file_ns_capable(sk->sk_socket->file, user_ns, cap) && |
| 161 | ns_capable(user_ns, cap); |
| 162 | } |
| 163 | EXPORT_SYMBOL(sk_ns_capable); |
| 164 | |
| 165 | /** |
| 166 | * sk_capable - Socket global capability test |
| 167 | * @sk: Socket to use a capability on or through |
Masanari Iida | e793c0f | 2014-09-04 23:44:36 +0900 | [diff] [blame] | 168 | * @cap: The global capability to use |
Eric W. Biederman | a3b299d | 2014-04-23 14:26:56 -0700 | [diff] [blame] | 169 | * |
| 170 | * Test to see if the opener of the socket had when the socket was |
| 171 | * created and the current process has the capability @cap in all user |
| 172 | * namespaces. |
| 173 | */ |
| 174 | bool sk_capable(const struct sock *sk, int cap) |
| 175 | { |
| 176 | return sk_ns_capable(sk, &init_user_ns, cap); |
| 177 | } |
| 178 | EXPORT_SYMBOL(sk_capable); |
| 179 | |
| 180 | /** |
| 181 | * sk_net_capable - Network namespace socket capability test |
| 182 | * @sk: Socket to use a capability on or through |
| 183 | * @cap: The capability to use |
| 184 | * |
Masanari Iida | e793c0f | 2014-09-04 23:44:36 +0900 | [diff] [blame] | 185 | * 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] | 186 | * and the current process has the capability @cap over the network namespace |
| 187 | * the socket is a member of. |
| 188 | */ |
| 189 | bool sk_net_capable(const struct sock *sk, int cap) |
| 190 | { |
| 191 | return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); |
| 192 | } |
| 193 | EXPORT_SYMBOL(sk_net_capable); |
| 194 | |
Ingo Molnar | da21f24 | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 195 | /* |
| 196 | * Each address family might have different locking rules, so we have |
| 197 | * one slock key per address family: |
| 198 | */ |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 199 | static struct lock_class_key af_family_keys[AF_MAX]; |
| 200 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
| 201 | |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 202 | /* |
| 203 | * Make lock validator output more readable. (we pre-construct these |
| 204 | * strings build-time, so that runtime initialization of socket |
| 205 | * locks is fast): |
| 206 | */ |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 207 | static const char *const af_family_key_strings[AF_MAX+1] = { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 208 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
| 209 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", |
| 210 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , |
| 211 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , |
| 212 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , |
| 213 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , |
| 214 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 215 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 216 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
Oliver Hartkopp | cd05acf | 2007-12-16 15:59:24 -0800 | [diff] [blame] | 217 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 218 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 219 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 220 | "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
Dexuan Cui | 0a1a37b | 2016-04-05 07:41:11 -0700 | [diff] [blame] | 221 | "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_KCM" , |
Anna, Suman | 33364ee | 2017-01-09 21:48:56 -0600 | [diff] [blame] | 222 | "sk_lock-AF_QIPCRTR", "sk_lock-AF_MAX" |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 223 | }; |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 224 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 225 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
| 226 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", |
| 227 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , |
| 228 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , |
| 229 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , |
| 230 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , |
| 231 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 232 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 233 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
Oliver Hartkopp | cd05acf | 2007-12-16 15:59:24 -0800 | [diff] [blame] | 234 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 235 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 236 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 237 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
Dexuan Cui | 0a1a37b | 2016-04-05 07:41:11 -0700 | [diff] [blame] | 238 | "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_KCM" , |
Anna, Suman | 33364ee | 2017-01-09 21:48:56 -0600 | [diff] [blame] | 239 | "slock-AF_QIPCRTR", "slock-AF_MAX" |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 240 | }; |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 241 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 242 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
| 243 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", |
| 244 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , |
| 245 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , |
| 246 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , |
| 247 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , |
| 248 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , |
Andy Grover | cbd151b | 2009-02-26 23:43:19 -0800 | [diff] [blame] | 249 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 250 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
Oliver Hartkopp | b4942af | 2008-07-23 14:06:04 -0700 | [diff] [blame] | 251 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
David Howells | e51f802 | 2007-07-21 19:30:16 -0700 | [diff] [blame] | 252 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
Remi Denis-Courmont | bce7b15 | 2008-09-22 19:51:15 -0700 | [diff] [blame] | 253 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
Miloslav Trmač | 6f107b5 | 2010-12-08 14:35:34 +0800 | [diff] [blame] | 254 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
Dexuan Cui | 0a1a37b | 2016-04-05 07:41:11 -0700 | [diff] [blame] | 255 | "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_KCM" , |
Anna, Suman | 33364ee | 2017-01-09 21:48:56 -0600 | [diff] [blame] | 256 | "clock-AF_QIPCRTR", "clock-AF_MAX" |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 257 | }; |
Ingo Molnar | da21f24 | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 258 | |
| 259 | /* |
| 260 | * sk_callback_lock locking rules are per-address-family, |
| 261 | * so split the lock classes by using a per-AF key: |
| 262 | */ |
| 263 | static struct lock_class_key af_callback_keys[AF_MAX]; |
| 264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | /* Take into consideration the size of the struct sk_buff overhead in the |
| 266 | * determination of these values, since that is non-constant across |
| 267 | * platforms. This makes socket queueing behavior and performance |
| 268 | * not depend upon such differences. |
| 269 | */ |
| 270 | #define _SK_MEM_PACKETS 256 |
Eric Dumazet | 87fb4b7 | 2011-10-13 07:28:54 +0000 | [diff] [blame] | 271 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 273 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 274 | |
| 275 | /* Run time adjustable parameters. */ |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 276 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
Hans Schillstrom | 6d8ebc8 | 2012-04-30 08:13:50 +0200 | [diff] [blame] | 277 | EXPORT_SYMBOL(sysctl_wmem_max); |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 278 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
Hans Schillstrom | 6d8ebc8 | 2012-04-30 08:13:50 +0200 | [diff] [blame] | 279 | EXPORT_SYMBOL(sysctl_rmem_max); |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 280 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
| 281 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 283 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 284 | 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] | 285 | EXPORT_SYMBOL(sysctl_optmem_max); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
Willem de Bruijn | b245be1 | 2015-01-30 13:29:32 -0500 | [diff] [blame] | 287 | int sysctl_tstamp_allow_data __read_mostly = 1; |
| 288 | |
Mel Gorman | c93bdd0 | 2012-07-31 16:44:19 -0700 | [diff] [blame] | 289 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
| 290 | EXPORT_SYMBOL_GPL(memalloc_socks); |
| 291 | |
Mel Gorman | 7cb0240 | 2012-07-31 16:44:16 -0700 | [diff] [blame] | 292 | /** |
| 293 | * sk_set_memalloc - sets %SOCK_MEMALLOC |
| 294 | * @sk: socket to set it on |
| 295 | * |
| 296 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. |
| 297 | * It's the responsibility of the admin to adjust min_free_kbytes |
| 298 | * to meet the requirements |
| 299 | */ |
| 300 | void sk_set_memalloc(struct sock *sk) |
| 301 | { |
| 302 | sock_set_flag(sk, SOCK_MEMALLOC); |
| 303 | sk->sk_allocation |= __GFP_MEMALLOC; |
Mel Gorman | c93bdd0 | 2012-07-31 16:44:19 -0700 | [diff] [blame] | 304 | static_key_slow_inc(&memalloc_socks); |
Mel Gorman | 7cb0240 | 2012-07-31 16:44:16 -0700 | [diff] [blame] | 305 | } |
| 306 | EXPORT_SYMBOL_GPL(sk_set_memalloc); |
| 307 | |
| 308 | void sk_clear_memalloc(struct sock *sk) |
| 309 | { |
| 310 | sock_reset_flag(sk, SOCK_MEMALLOC); |
| 311 | sk->sk_allocation &= ~__GFP_MEMALLOC; |
Mel Gorman | c93bdd0 | 2012-07-31 16:44:19 -0700 | [diff] [blame] | 312 | static_key_slow_dec(&memalloc_socks); |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 313 | |
| 314 | /* |
| 315 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward |
Mel Gorman | 5d75361 | 2015-06-10 21:02:04 -0400 | [diff] [blame] | 316 | * progress of swapping. SOCK_MEMALLOC may be cleared while |
| 317 | * it has rmem allocations due to the last swapfile being deactivated |
| 318 | * but there is a risk that the socket is unusable due to exceeding |
| 319 | * the rmem limits. Reclaim the reserves and obey rmem limits again. |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 320 | */ |
Mel Gorman | 5d75361 | 2015-06-10 21:02:04 -0400 | [diff] [blame] | 321 | sk_mem_reclaim(sk); |
Mel Gorman | 7cb0240 | 2012-07-31 16:44:16 -0700 | [diff] [blame] | 322 | } |
| 323 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); |
| 324 | |
Mel Gorman | b4b9e35 | 2012-07-31 16:44:26 -0700 | [diff] [blame] | 325 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
| 326 | { |
| 327 | int ret; |
| 328 | unsigned long pflags = current->flags; |
| 329 | |
| 330 | /* these should have been dropped before queueing */ |
| 331 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); |
| 332 | |
| 333 | current->flags |= PF_MEMALLOC; |
| 334 | ret = sk->sk_backlog_rcv(sk, skb); |
| 335 | tsk_restore_flags(current, pflags, PF_MEMALLOC); |
| 336 | |
| 337 | return ret; |
| 338 | } |
| 339 | EXPORT_SYMBOL(__sk_backlog_rcv); |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
| 342 | { |
| 343 | struct timeval tv; |
| 344 | |
| 345 | if (optlen < sizeof(tv)) |
| 346 | return -EINVAL; |
| 347 | if (copy_from_user(&tv, optval, sizeof(tv))) |
| 348 | return -EFAULT; |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 349 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
| 350 | return -EDOM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 352 | if (tv.tv_sec < 0) { |
Andrew Morton | 6f11df8 | 2007-07-09 13:16:00 -0700 | [diff] [blame] | 353 | static int warned __read_mostly; |
| 354 | |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 355 | *timeo_p = 0; |
Ilpo Järvinen | 50aab54 | 2008-05-02 16:20:10 -0700 | [diff] [blame] | 356 | if (warned < 10 && net_ratelimit()) { |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 357 | warned++; |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 358 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
| 359 | __func__, current->comm, task_pid_nr(current)); |
Ilpo Järvinen | 50aab54 | 2008-05-02 16:20:10 -0700 | [diff] [blame] | 360 | } |
Vasily Averin | ba78073 | 2007-05-24 16:58:54 -0700 | [diff] [blame] | 361 | return 0; |
| 362 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
| 364 | if (tv.tv_sec == 0 && tv.tv_usec == 0) |
| 365 | return 0; |
| 366 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) |
| 367 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | static void sock_warn_obsolete_bsdism(const char *name) |
| 372 | { |
| 373 | static int warned; |
| 374 | static char warncomm[TASK_COMM_LEN]; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 375 | if (strcmp(warncomm, current->comm) && warned < 5) { |
| 376 | strcpy(warncomm, current->comm); |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 377 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
| 378 | warncomm, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | warned++; |
| 380 | } |
| 381 | } |
| 382 | |
Hannes Frederic Sowa | 080a270 | 2015-10-26 13:51:37 +0100 | [diff] [blame] | 383 | static bool sock_needs_netstamp(const struct sock *sk) |
| 384 | { |
| 385 | switch (sk->sk_family) { |
| 386 | case AF_UNSPEC: |
| 387 | case AF_UNIX: |
| 388 | return false; |
| 389 | default: |
| 390 | return true; |
| 391 | } |
| 392 | } |
| 393 | |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 394 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 395 | { |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 396 | if (sk->sk_flags & flags) { |
| 397 | sk->sk_flags &= ~flags; |
Hannes Frederic Sowa | 080a270 | 2015-10-26 13:51:37 +0100 | [diff] [blame] | 398 | if (sock_needs_netstamp(sk) && |
| 399 | !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 400 | net_disable_timestamp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | } |
| 403 | |
| 404 | |
samanthakumar | e6afc8a | 2016-04-05 12:41:15 -0400 | [diff] [blame] | 405 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 406 | { |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 407 | unsigned long flags; |
| 408 | struct sk_buff_head *list = &sk->sk_receive_queue; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 409 | |
Eric Dumazet | 0fd7bac | 2011-12-21 07:11:44 +0000 | [diff] [blame] | 410 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 411 | atomic_inc(&sk->sk_drops); |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 412 | trace_sock_rcvqueue_full(sk, skb); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 413 | return -ENOMEM; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 414 | } |
| 415 | |
Mel Gorman | c76562b | 2012-07-31 16:44:41 -0700 | [diff] [blame] | 416 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 417 | atomic_inc(&sk->sk_drops); |
| 418 | return -ENOBUFS; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 419 | } |
| 420 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 421 | skb->dev = NULL; |
| 422 | skb_set_owner_r(skb, sk); |
David S. Miller | 49ad959 | 2008-12-17 22:11:38 -0800 | [diff] [blame] | 423 | |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 424 | /* we escape from rcu protected region, make sure we dont leak |
| 425 | * a norefcounted dst |
| 426 | */ |
| 427 | skb_dst_force(skb); |
| 428 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 429 | spin_lock_irqsave(&list->lock, flags); |
Eyal Birger | 3bc3b96 | 2015-03-01 14:58:30 +0200 | [diff] [blame] | 430 | sock_skb_set_dropcount(sk, skb); |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 431 | __skb_queue_tail(list, skb); |
| 432 | spin_unlock_irqrestore(&list->lock, flags); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 433 | |
| 434 | if (!sock_flag(sk, SOCK_DEAD)) |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 435 | sk->sk_data_ready(sk); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 436 | return 0; |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 437 | } |
samanthakumar | e6afc8a | 2016-04-05 12:41:15 -0400 | [diff] [blame] | 438 | EXPORT_SYMBOL(__sock_queue_rcv_skb); |
| 439 | |
| 440 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 441 | { |
| 442 | int err; |
| 443 | |
| 444 | err = sk_filter(sk, skb); |
| 445 | if (err) |
| 446 | return err; |
| 447 | |
| 448 | return __sock_queue_rcv_skb(sk, skb); |
| 449 | } |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 450 | EXPORT_SYMBOL(sock_queue_rcv_skb); |
| 451 | |
Willem de Bruijn | 4f0c40d9 | 2016-07-12 18:18:57 -0400 | [diff] [blame] | 452 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
Eric Dumazet | c3f24cf | 2016-11-02 17:14:41 -0700 | [diff] [blame] | 453 | const int nested, unsigned int trim_cap, bool refcounted) |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 454 | { |
| 455 | int rc = NET_RX_SUCCESS; |
| 456 | |
Willem de Bruijn | 4f0c40d9 | 2016-07-12 18:18:57 -0400 | [diff] [blame] | 457 | if (sk_filter_trim_cap(sk, skb, trim_cap)) |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 458 | goto discard_and_relse; |
| 459 | |
| 460 | skb->dev = NULL; |
| 461 | |
Sorin Dumitru | 274f482 | 2014-07-22 21:16:51 +0300 | [diff] [blame] | 462 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 463 | atomic_inc(&sk->sk_drops); |
| 464 | goto discard_and_relse; |
| 465 | } |
Arnaldo Carvalho de Melo | 58a5a7b | 2006-11-16 14:06:06 -0200 | [diff] [blame] | 466 | if (nested) |
| 467 | bh_lock_sock_nested(sk); |
| 468 | else |
| 469 | bh_lock_sock(sk); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 470 | if (!sock_owned_by_user(sk)) { |
| 471 | /* |
| 472 | * trylock + unlock semantics: |
| 473 | */ |
| 474 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); |
| 475 | |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 476 | rc = sk_backlog_rcv(sk, skb); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 477 | |
| 478 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); |
Eric Dumazet | f545a38 | 2012-04-22 23:34:26 +0000 | [diff] [blame] | 479 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 480 | bh_unlock_sock(sk); |
| 481 | atomic_inc(&sk->sk_drops); |
| 482 | goto discard_and_relse; |
| 483 | } |
| 484 | |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 485 | bh_unlock_sock(sk); |
| 486 | out: |
Eric Dumazet | c3f24cf | 2016-11-02 17:14:41 -0700 | [diff] [blame] | 487 | if (refcounted) |
| 488 | sock_put(sk); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 489 | return rc; |
| 490 | discard_and_relse: |
| 491 | kfree_skb(skb); |
| 492 | goto out; |
| 493 | } |
Willem de Bruijn | 4f0c40d9 | 2016-07-12 18:18:57 -0400 | [diff] [blame] | 494 | EXPORT_SYMBOL(__sk_receive_skb); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 495 | |
| 496 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
| 497 | { |
Eric Dumazet | b6c6712 | 2010-04-08 23:03:29 +0000 | [diff] [blame] | 498 | struct dst_entry *dst = __sk_dst_get(sk); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 499 | |
| 500 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 501 | sk_tx_queue_clear(sk); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 502 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
Denis Vlasenko | f0088a5 | 2006-03-28 01:08:21 -0800 | [diff] [blame] | 503 | dst_release(dst); |
| 504 | return NULL; |
| 505 | } |
| 506 | |
| 507 | return dst; |
| 508 | } |
| 509 | EXPORT_SYMBOL(__sk_dst_check); |
| 510 | |
| 511 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) |
| 512 | { |
| 513 | struct dst_entry *dst = sk_dst_get(sk); |
| 514 | |
| 515 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { |
| 516 | sk_dst_reset(sk); |
| 517 | dst_release(dst); |
| 518 | return NULL; |
| 519 | } |
| 520 | |
| 521 | return dst; |
| 522 | } |
| 523 | EXPORT_SYMBOL(sk_dst_check); |
| 524 | |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 525 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
| 526 | int optlen) |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 527 | { |
| 528 | int ret = -ENOPROTOOPT; |
| 529 | #ifdef CONFIG_NETDEVICES |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 530 | struct net *net = sock_net(sk); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 531 | char devname[IFNAMSIZ]; |
| 532 | int index; |
| 533 | |
| 534 | /* Sorry... */ |
| 535 | ret = -EPERM; |
Eric W. Biederman | 5e1fccc | 2012-11-16 03:03:04 +0000 | [diff] [blame] | 536 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 537 | goto out; |
| 538 | |
| 539 | ret = -EINVAL; |
| 540 | if (optlen < 0) |
| 541 | goto out; |
| 542 | |
| 543 | /* Bind this socket to a particular device like "eth0", |
| 544 | * as specified in the passed interface name. If the |
| 545 | * name is "" or the option length is zero the socket |
| 546 | * is not bound. |
| 547 | */ |
| 548 | if (optlen > IFNAMSIZ - 1) |
| 549 | optlen = IFNAMSIZ - 1; |
| 550 | memset(devname, 0, sizeof(devname)); |
| 551 | |
| 552 | ret = -EFAULT; |
| 553 | if (copy_from_user(devname, optval, optlen)) |
| 554 | goto out; |
| 555 | |
David S. Miller | 000ba2e | 2009-11-05 22:37:11 -0800 | [diff] [blame] | 556 | index = 0; |
| 557 | if (devname[0] != '\0') { |
Eric Dumazet | bf8e56b | 2009-11-05 21:03:39 -0800 | [diff] [blame] | 558 | struct net_device *dev; |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 559 | |
Eric Dumazet | bf8e56b | 2009-11-05 21:03:39 -0800 | [diff] [blame] | 560 | rcu_read_lock(); |
| 561 | dev = dev_get_by_name_rcu(net, devname); |
| 562 | if (dev) |
| 563 | index = dev->ifindex; |
| 564 | rcu_read_unlock(); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 565 | ret = -ENODEV; |
| 566 | if (!dev) |
| 567 | goto out; |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 568 | } |
| 569 | |
| 570 | lock_sock(sk); |
| 571 | sk->sk_bound_dev_if = index; |
| 572 | sk_dst_reset(sk); |
| 573 | release_sock(sk); |
| 574 | |
| 575 | ret = 0; |
| 576 | |
| 577 | out: |
| 578 | #endif |
| 579 | |
| 580 | return ret; |
| 581 | } |
| 582 | |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 583 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
| 584 | int __user *optlen, int len) |
| 585 | { |
| 586 | int ret = -ENOPROTOOPT; |
| 587 | #ifdef CONFIG_NETDEVICES |
| 588 | struct net *net = sock_net(sk); |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 589 | char devname[IFNAMSIZ]; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 590 | |
| 591 | if (sk->sk_bound_dev_if == 0) { |
| 592 | len = 0; |
| 593 | goto zero; |
| 594 | } |
| 595 | |
| 596 | ret = -EINVAL; |
| 597 | if (len < IFNAMSIZ) |
| 598 | goto out; |
| 599 | |
Nicolas Schichan | 5dbe7c1 | 2013-06-26 17:23:42 +0200 | [diff] [blame] | 600 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
| 601 | if (ret) |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 602 | goto out; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 603 | |
| 604 | len = strlen(devname) + 1; |
| 605 | |
| 606 | ret = -EFAULT; |
| 607 | if (copy_to_user(optval, devname, len)) |
| 608 | goto out; |
| 609 | |
| 610 | zero: |
| 611 | ret = -EFAULT; |
| 612 | if (put_user(len, optlen)) |
| 613 | goto out; |
| 614 | |
| 615 | ret = 0; |
| 616 | |
| 617 | out: |
| 618 | #endif |
| 619 | |
| 620 | return ret; |
| 621 | } |
| 622 | |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 623 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
| 624 | { |
| 625 | if (valbool) |
| 626 | sock_set_flag(sk, bit); |
| 627 | else |
| 628 | sock_reset_flag(sk, bit); |
| 629 | } |
| 630 | |
hannes@stressinduktion.org | f60e599 | 2015-04-01 17:07:44 +0200 | [diff] [blame] | 631 | bool sk_mc_loop(struct sock *sk) |
| 632 | { |
| 633 | if (dev_recursion_level()) |
| 634 | return false; |
| 635 | if (!sk) |
| 636 | return true; |
| 637 | switch (sk->sk_family) { |
| 638 | case AF_INET: |
| 639 | return inet_sk(sk)->mc_loop; |
| 640 | #if IS_ENABLED(CONFIG_IPV6) |
| 641 | case AF_INET6: |
| 642 | return inet6_sk(sk)->mc_loop; |
| 643 | #endif |
| 644 | } |
| 645 | WARN_ON(1); |
| 646 | return true; |
| 647 | } |
| 648 | EXPORT_SYMBOL(sk_mc_loop); |
| 649 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | /* |
| 651 | * This is meant for all protocols to use and covers goings on |
| 652 | * at the socket level. Everything here is generic. |
| 653 | */ |
| 654 | |
| 655 | int sock_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 656 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | { |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 658 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | int val; |
| 660 | int valbool; |
| 661 | struct linger ling; |
| 662 | int ret = 0; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | /* |
| 665 | * Options without arguments |
| 666 | */ |
| 667 | |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 668 | if (optname == SO_BINDTODEVICE) |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 669 | return sock_setbindtodevice(sk, optval, optlen); |
David S. Miller | 4878809 | 2007-09-14 16:41:03 -0700 | [diff] [blame] | 670 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 671 | if (optlen < sizeof(int)) |
| 672 | return -EINVAL; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | if (get_user(val, (int __user *)optval)) |
| 675 | return -EFAULT; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 676 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 677 | valbool = val ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | |
| 679 | lock_sock(sk); |
| 680 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 681 | switch (optname) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 682 | case SO_DEBUG: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 683 | if (val && !capable(CAP_NET_ADMIN)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 684 | ret = -EACCES; |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 685 | else |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 686 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 687 | break; |
| 688 | case SO_REUSEADDR: |
Pavel Emelyanov | 4a17fd5 | 2012-04-19 03:39:36 +0000 | [diff] [blame] | 689 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 690 | break; |
Tom Herbert | 055dc21 | 2013-01-22 09:49:50 +0000 | [diff] [blame] | 691 | case SO_REUSEPORT: |
| 692 | sk->sk_reuseport = valbool; |
| 693 | break; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 694 | case SO_TYPE: |
Jan Engelhardt | 49c794e | 2009-08-04 07:28:28 +0000 | [diff] [blame] | 695 | case SO_PROTOCOL: |
Jan Engelhardt | 0d6038e | 2009-08-04 07:28:29 +0000 | [diff] [blame] | 696 | case SO_DOMAIN: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 697 | case SO_ERROR: |
| 698 | ret = -ENOPROTOOPT; |
| 699 | break; |
| 700 | case SO_DONTROUTE: |
Pavel Emelyanov | c0ef877 | 2007-11-15 03:03:19 -0800 | [diff] [blame] | 701 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 702 | break; |
| 703 | case SO_BROADCAST: |
| 704 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); |
| 705 | break; |
| 706 | case SO_SNDBUF: |
| 707 | /* Don't error on this BSD doesn't and if you think |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 708 | * about it this is right. Otherwise apps have to |
| 709 | * play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 710 | * are treated in BSD as hints |
| 711 | */ |
| 712 | val = min_t(u32, val, sysctl_wmem_max); |
Patrick McHardy | b0573de | 2005-08-09 19:30:51 -0700 | [diff] [blame] | 713 | set_sndbuf: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 714 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
Eric Dumazet | b98b0bc | 2016-12-02 09:44:53 -0800 | [diff] [blame] | 715 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 716 | /* Wake up sending tasks if we upped the value. */ |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 717 | sk->sk_write_space(sk); |
| 718 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 720 | case SO_SNDBUFFORCE: |
| 721 | if (!capable(CAP_NET_ADMIN)) { |
| 722 | ret = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | break; |
| 724 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 725 | goto set_sndbuf; |
| 726 | |
| 727 | case SO_RCVBUF: |
| 728 | /* Don't error on this BSD doesn't and if you think |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 729 | * about it this is right. Otherwise apps have to |
| 730 | * play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 731 | * are treated in BSD as hints |
| 732 | */ |
| 733 | val = min_t(u32, val, sysctl_rmem_max); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 734 | set_rcvbuf: |
| 735 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| 736 | /* |
| 737 | * We double it on the way in to account for |
| 738 | * "struct sk_buff" etc. overhead. Applications |
| 739 | * assume that the SO_RCVBUF setting they make will |
| 740 | * allow that much actual data to be received on that |
| 741 | * socket. |
| 742 | * |
| 743 | * Applications are unaware that "struct sk_buff" and |
| 744 | * other overheads allocate from the receive buffer |
| 745 | * during socket buffer allocation. |
| 746 | * |
| 747 | * And after considering the possible alternatives, |
| 748 | * returning the value we actually used in getsockopt |
| 749 | * is the most desirable behavior. |
| 750 | */ |
Eric Dumazet | b98b0bc | 2016-12-02 09:44:53 -0800 | [diff] [blame] | 751 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 752 | break; |
| 753 | |
| 754 | case SO_RCVBUFFORCE: |
| 755 | if (!capable(CAP_NET_ADMIN)) { |
| 756 | ret = -EPERM; |
| 757 | break; |
| 758 | } |
| 759 | goto set_rcvbuf; |
| 760 | |
| 761 | case SO_KEEPALIVE: |
| 762 | #ifdef CONFIG_INET |
Eric Dumazet | 3e10986 | 2012-09-24 07:00:11 +0000 | [diff] [blame] | 763 | if (sk->sk_protocol == IPPROTO_TCP && |
| 764 | sk->sk_type == SOCK_STREAM) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 765 | tcp_set_keepalive(sk, valbool); |
| 766 | #endif |
| 767 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
| 768 | break; |
| 769 | |
| 770 | case SO_OOBINLINE: |
| 771 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); |
| 772 | break; |
| 773 | |
| 774 | case SO_NO_CHECK: |
Tom Herbert | 28448b8 | 2014-05-23 08:47:19 -0700 | [diff] [blame] | 775 | sk->sk_no_check_tx = valbool; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 776 | break; |
| 777 | |
| 778 | case SO_PRIORITY: |
Eric W. Biederman | 5e1fccc | 2012-11-16 03:03:04 +0000 | [diff] [blame] | 779 | if ((val >= 0 && val <= 6) || |
| 780 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 781 | sk->sk_priority = val; |
| 782 | else |
| 783 | ret = -EPERM; |
| 784 | break; |
| 785 | |
| 786 | case SO_LINGER: |
| 787 | if (optlen < sizeof(ling)) { |
| 788 | ret = -EINVAL; /* 1003.1g */ |
| 789 | break; |
| 790 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 791 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 792 | ret = -EFAULT; |
| 793 | break; |
| 794 | } |
| 795 | if (!ling.l_onoff) |
| 796 | sock_reset_flag(sk, SOCK_LINGER); |
| 797 | else { |
| 798 | #if (BITS_PER_LONG == 32) |
| 799 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
| 800 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; |
| 801 | else |
| 802 | #endif |
| 803 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; |
| 804 | sock_set_flag(sk, SOCK_LINGER); |
| 805 | } |
| 806 | break; |
| 807 | |
| 808 | case SO_BSDCOMPAT: |
| 809 | sock_warn_obsolete_bsdism("setsockopt"); |
| 810 | break; |
| 811 | |
| 812 | case SO_PASSCRED: |
| 813 | if (valbool) |
| 814 | set_bit(SOCK_PASSCRED, &sock->flags); |
| 815 | else |
| 816 | clear_bit(SOCK_PASSCRED, &sock->flags); |
| 817 | break; |
| 818 | |
| 819 | case SO_TIMESTAMP: |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 820 | case SO_TIMESTAMPNS: |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 821 | if (valbool) { |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 822 | if (optname == SO_TIMESTAMP) |
| 823 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| 824 | else |
| 825 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 826 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 827 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 828 | } else { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 829 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 830 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
| 831 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 832 | break; |
| 833 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 834 | case SO_TIMESTAMPING: |
| 835 | if (val & ~SOF_TIMESTAMPING_MASK) { |
Rémi Denis-Courmont | f249fb7 | 2009-07-20 00:47:04 +0000 | [diff] [blame] | 836 | ret = -EINVAL; |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 837 | break; |
| 838 | } |
Willem de Bruijn | b245be1 | 2015-01-30 13:29:32 -0500 | [diff] [blame] | 839 | |
Willem de Bruijn | 09c2d25 | 2014-08-04 22:11:47 -0400 | [diff] [blame] | 840 | if (val & SOF_TIMESTAMPING_OPT_ID && |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 841 | !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
WANG Cong | ac5cc97 | 2015-12-16 23:39:04 -0800 | [diff] [blame] | 842 | if (sk->sk_protocol == IPPROTO_TCP && |
| 843 | sk->sk_type == SOCK_STREAM) { |
Soheil Hassas Yeganeh | 6db8b96 | 2016-04-02 23:08:07 -0400 | [diff] [blame] | 844 | if ((1 << sk->sk_state) & |
| 845 | (TCPF_CLOSE | TCPF_LISTEN)) { |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 846 | ret = -EINVAL; |
| 847 | break; |
| 848 | } |
| 849 | sk->sk_tskey = tcp_sk(sk)->snd_una; |
| 850 | } else { |
| 851 | sk->sk_tskey = 0; |
| 852 | } |
| 853 | } |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 854 | sk->sk_tsflags = val; |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 855 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
| 856 | sock_enable_timestamp(sk, |
| 857 | SOCK_TIMESTAMPING_RX_SOFTWARE); |
| 858 | else |
| 859 | sock_disable_timestamp(sk, |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 860 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 861 | break; |
| 862 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 863 | case SO_RCVLOWAT: |
| 864 | if (val < 0) |
| 865 | val = INT_MAX; |
| 866 | sk->sk_rcvlowat = val ? : 1; |
| 867 | break; |
| 868 | |
| 869 | case SO_RCVTIMEO: |
| 870 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); |
| 871 | break; |
| 872 | |
| 873 | case SO_SNDTIMEO: |
| 874 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); |
| 875 | break; |
| 876 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 877 | case SO_ATTACH_FILTER: |
| 878 | ret = -EINVAL; |
| 879 | if (optlen == sizeof(struct sock_fprog)) { |
| 880 | struct sock_fprog fprog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 882 | ret = -EFAULT; |
| 883 | if (copy_from_user(&fprog, optval, sizeof(fprog))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 886 | ret = sk_attach_filter(&fprog, sk); |
| 887 | } |
| 888 | break; |
| 889 | |
Alexei Starovoitov | 89aa075 | 2014-12-01 15:06:35 -0800 | [diff] [blame] | 890 | case SO_ATTACH_BPF: |
| 891 | ret = -EINVAL; |
| 892 | if (optlen == sizeof(u32)) { |
| 893 | u32 ufd; |
| 894 | |
| 895 | ret = -EFAULT; |
| 896 | if (copy_from_user(&ufd, optval, sizeof(ufd))) |
| 897 | break; |
| 898 | |
| 899 | ret = sk_attach_bpf(ufd, sk); |
| 900 | } |
| 901 | break; |
| 902 | |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 903 | case SO_ATTACH_REUSEPORT_CBPF: |
| 904 | ret = -EINVAL; |
| 905 | if (optlen == sizeof(struct sock_fprog)) { |
| 906 | struct sock_fprog fprog; |
| 907 | |
| 908 | ret = -EFAULT; |
| 909 | if (copy_from_user(&fprog, optval, sizeof(fprog))) |
| 910 | break; |
| 911 | |
| 912 | ret = sk_reuseport_attach_filter(&fprog, sk); |
| 913 | } |
| 914 | break; |
| 915 | |
| 916 | case SO_ATTACH_REUSEPORT_EBPF: |
| 917 | ret = -EINVAL; |
| 918 | if (optlen == sizeof(u32)) { |
| 919 | u32 ufd; |
| 920 | |
| 921 | ret = -EFAULT; |
| 922 | if (copy_from_user(&ufd, optval, sizeof(ufd))) |
| 923 | break; |
| 924 | |
| 925 | ret = sk_reuseport_attach_bpf(ufd, sk); |
| 926 | } |
| 927 | break; |
| 928 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 929 | case SO_DETACH_FILTER: |
Pavel Emelyanov | 55b3332 | 2007-10-17 21:21:26 -0700 | [diff] [blame] | 930 | ret = sk_detach_filter(sk); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 931 | break; |
| 932 | |
Vincent Bernat | d59577b | 2013-01-16 22:55:49 +0100 | [diff] [blame] | 933 | case SO_LOCK_FILTER: |
| 934 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) |
| 935 | ret = -EPERM; |
| 936 | else |
| 937 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); |
| 938 | break; |
| 939 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 940 | case SO_PASSSEC: |
| 941 | if (valbool) |
| 942 | set_bit(SOCK_PASSSEC, &sock->flags); |
| 943 | else |
| 944 | clear_bit(SOCK_PASSSEC, &sock->flags); |
| 945 | break; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 946 | case SO_MARK: |
Eric W. Biederman | 5e1fccc | 2012-11-16 03:03:04 +0000 | [diff] [blame] | 947 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 948 | ret = -EPERM; |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 949 | else |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 950 | sk->sk_mark = val; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 951 | break; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 952 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 953 | case SO_RXQ_OVFL: |
Johannes Berg | 8083f0f | 2011-10-07 03:30:20 +0000 | [diff] [blame] | 954 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 955 | break; |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 956 | |
| 957 | case SO_WIFI_STATUS: |
| 958 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); |
| 959 | break; |
| 960 | |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 961 | case SO_PEEK_OFF: |
| 962 | if (sock->ops->set_peek_off) |
Sasha Levin | 12663bf | 2013-12-07 17:26:27 -0500 | [diff] [blame] | 963 | ret = sock->ops->set_peek_off(sk, val); |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 964 | else |
| 965 | ret = -EOPNOTSUPP; |
| 966 | break; |
Ben Greear | 3bdc0eb | 2012-02-11 15:39:30 +0000 | [diff] [blame] | 967 | |
| 968 | case SO_NOFCS: |
| 969 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); |
| 970 | break; |
| 971 | |
Keller, Jacob E | 7d4c04f | 2013-03-28 11:19:25 +0000 | [diff] [blame] | 972 | case SO_SELECT_ERR_QUEUE: |
| 973 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); |
| 974 | break; |
| 975 | |
Cong Wang | e0d1095 | 2013-08-01 11:10:25 +0800 | [diff] [blame] | 976 | #ifdef CONFIG_NET_RX_BUSY_POLL |
Eliezer Tamir | 64b0dc5 | 2013-07-10 17:13:36 +0300 | [diff] [blame] | 977 | case SO_BUSY_POLL: |
Eliezer Tamir | dafcc43 | 2013-06-14 16:33:57 +0300 | [diff] [blame] | 978 | /* allow unprivileged users to decrease the value */ |
| 979 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) |
| 980 | ret = -EPERM; |
| 981 | else { |
| 982 | if (val < 0) |
| 983 | ret = -EINVAL; |
| 984 | else |
| 985 | sk->sk_ll_usec = val; |
| 986 | } |
| 987 | break; |
| 988 | #endif |
Eric Dumazet | 62748f3 | 2013-09-24 08:20:52 -0700 | [diff] [blame] | 989 | |
| 990 | case SO_MAX_PACING_RATE: |
| 991 | sk->sk_max_pacing_rate = val; |
| 992 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, |
| 993 | sk->sk_max_pacing_rate); |
| 994 | break; |
| 995 | |
Eric Dumazet | 70da268 | 2015-10-08 19:33:21 -0700 | [diff] [blame] | 996 | case SO_INCOMING_CPU: |
| 997 | sk->sk_incoming_cpu = val; |
| 998 | break; |
| 999 | |
Tom Herbert | a87cb3e | 2016-02-24 10:02:52 -0800 | [diff] [blame] | 1000 | case SO_CNX_ADVICE: |
| 1001 | if (val == 1) |
| 1002 | dst_negative_advice(sk); |
| 1003 | break; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1004 | default: |
| 1005 | ret = -ENOPROTOOPT; |
| 1006 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1007 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | release_sock(sk); |
| 1009 | return ret; |
| 1010 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1011 | EXPORT_SYMBOL(sock_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | |
| 1013 | |
stephen hemminger | 8f09898 | 2014-01-03 09:17:14 -0800 | [diff] [blame] | 1014 | static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
| 1015 | struct ucred *ucred) |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 1016 | { |
| 1017 | ucred->pid = pid_vnr(pid); |
| 1018 | ucred->uid = ucred->gid = -1; |
| 1019 | if (cred) { |
| 1020 | struct user_namespace *current_ns = current_user_ns(); |
| 1021 | |
Eric W. Biederman | b2e4f54 | 2012-05-23 16:39:45 -0600 | [diff] [blame] | 1022 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
| 1023 | ucred->gid = from_kgid_munged(current_ns, cred->egid); |
Eric W. Biederman | 3f551f9 | 2010-06-13 03:28:59 +0000 | [diff] [blame] | 1024 | } |
| 1025 | } |
| 1026 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | int sock_getsockopt(struct socket *sock, int level, int optname, |
| 1028 | char __user *optval, int __user *optlen) |
| 1029 | { |
| 1030 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1031 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1032 | union { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1033 | int val; |
Chenbo Feng | 3fe100e | 2017-04-05 19:00:55 -0700 | [diff] [blame] | 1034 | u64 val64; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1035 | struct linger ling; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | struct timeval tm; |
| 1037 | } v; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1038 | |
H Hartley Sweeten | 4d0392b | 2010-01-15 01:08:58 -0800 | [diff] [blame] | 1039 | int lv = sizeof(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | int len; |
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 | if (get_user(len, optlen)) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1043 | return -EFAULT; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1044 | if (len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | return -EINVAL; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1046 | |
Eugene Teo | 50fee1d | 2009-02-23 15:38:41 -0800 | [diff] [blame] | 1047 | memset(&v, 0, sizeof(v)); |
Clément Lecigne | df0bca0 | 2009-02-12 16:59:09 -0800 | [diff] [blame] | 1048 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1049 | switch (optname) { |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1050 | case SO_DEBUG: |
| 1051 | v.val = sock_flag(sk, SOCK_DBG); |
| 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_DONTROUTE: |
| 1055 | v.val = sock_flag(sk, SOCK_LOCALROUTE); |
| 1056 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1057 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1058 | case SO_BROADCAST: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1059 | v.val = sock_flag(sk, SOCK_BROADCAST); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1060 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1062 | case SO_SNDBUF: |
| 1063 | v.val = sk->sk_sndbuf; |
| 1064 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1065 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1066 | case SO_RCVBUF: |
| 1067 | v.val = sk->sk_rcvbuf; |
| 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_REUSEADDR: |
| 1071 | v.val = sk->sk_reuse; |
| 1072 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | |
Tom Herbert | 055dc21 | 2013-01-22 09:49:50 +0000 | [diff] [blame] | 1074 | case SO_REUSEPORT: |
| 1075 | v.val = sk->sk_reuseport; |
| 1076 | break; |
| 1077 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1078 | case SO_KEEPALIVE: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1079 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1080 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1082 | case SO_TYPE: |
| 1083 | v.val = sk->sk_type; |
| 1084 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | |
Jan Engelhardt | 49c794e | 2009-08-04 07:28:28 +0000 | [diff] [blame] | 1086 | case SO_PROTOCOL: |
| 1087 | v.val = sk->sk_protocol; |
| 1088 | break; |
| 1089 | |
Jan Engelhardt | 0d6038e | 2009-08-04 07:28:29 +0000 | [diff] [blame] | 1090 | case SO_DOMAIN: |
| 1091 | v.val = sk->sk_family; |
| 1092 | break; |
| 1093 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1094 | case SO_ERROR: |
| 1095 | v.val = -sock_error(sk); |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1096 | if (v.val == 0) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1097 | v.val = xchg(&sk->sk_err_soft, 0); |
| 1098 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1100 | case SO_OOBINLINE: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1101 | v.val = sock_flag(sk, SOCK_URGINLINE); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1102 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1103 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1104 | case SO_NO_CHECK: |
Tom Herbert | 28448b8 | 2014-05-23 08:47:19 -0700 | [diff] [blame] | 1105 | v.val = sk->sk_no_check_tx; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1106 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1108 | case SO_PRIORITY: |
| 1109 | v.val = sk->sk_priority; |
| 1110 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1111 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1112 | case SO_LINGER: |
| 1113 | lv = sizeof(v.ling); |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1114 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1115 | v.ling.l_linger = sk->sk_lingertime / HZ; |
| 1116 | break; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1117 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1118 | case SO_BSDCOMPAT: |
| 1119 | sock_warn_obsolete_bsdism("getsockopt"); |
| 1120 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1122 | case SO_TIMESTAMP: |
Eric Dumazet | 92f37fd | 2007-03-25 22:14:49 -0700 | [diff] [blame] | 1123 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
| 1124 | !sock_flag(sk, SOCK_RCVTSTAMPNS); |
| 1125 | break; |
| 1126 | |
| 1127 | case SO_TIMESTAMPNS: |
| 1128 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1129 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1131 | case SO_TIMESTAMPING: |
Willem de Bruijn | b9f40e2 | 2014-08-04 22:11:46 -0400 | [diff] [blame] | 1132 | v.val = sk->sk_tsflags; |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 1133 | break; |
| 1134 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1135 | case SO_RCVTIMEO: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1136 | lv = sizeof(struct timeval); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1137 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 1138 | v.tm.tv_sec = 0; |
| 1139 | v.tm.tv_usec = 0; |
| 1140 | } else { |
| 1141 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; |
| 1142 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1144 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1146 | case SO_SNDTIMEO: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1147 | lv = sizeof(struct timeval); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1148 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 1149 | v.tm.tv_sec = 0; |
| 1150 | v.tm.tv_usec = 0; |
| 1151 | } else { |
| 1152 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; |
| 1153 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; |
| 1154 | } |
| 1155 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1157 | case SO_RCVLOWAT: |
| 1158 | v.val = sk->sk_rcvlowat; |
| 1159 | break; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 1160 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1161 | case SO_SNDLOWAT: |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1162 | v.val = 1; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1163 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1165 | case SO_PASSCRED: |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 1166 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1167 | break; |
| 1168 | |
| 1169 | case SO_PEERCRED: |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1170 | { |
| 1171 | struct ucred peercred; |
| 1172 | if (len > sizeof(peercred)) |
| 1173 | len = sizeof(peercred); |
| 1174 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); |
| 1175 | if (copy_to_user(optval, &peercred, len)) |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1176 | return -EFAULT; |
| 1177 | goto lenout; |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1178 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1179 | |
| 1180 | case SO_PEERNAME: |
| 1181 | { |
| 1182 | char address[128]; |
| 1183 | |
| 1184 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) |
| 1185 | return -ENOTCONN; |
| 1186 | if (lv < len) |
| 1187 | return -EINVAL; |
| 1188 | if (copy_to_user(optval, address, len)) |
| 1189 | return -EFAULT; |
| 1190 | goto lenout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | } |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1192 | |
| 1193 | /* Dubious BSD thing... Probably nobody even uses it, but |
| 1194 | * the UNIX standard wants it for whatever reason... -DaveM |
| 1195 | */ |
| 1196 | case SO_ACCEPTCONN: |
| 1197 | v.val = sk->sk_state == TCP_LISTEN; |
| 1198 | break; |
| 1199 | |
| 1200 | case SO_PASSSEC: |
Eric Dumazet | 8298193 | 2012-04-26 20:07:59 +0000 | [diff] [blame] | 1201 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1202 | break; |
| 1203 | |
| 1204 | case SO_PEERSEC: |
| 1205 | return security_socket_getpeersec_stream(sock, optval, optlen, len); |
| 1206 | |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 1207 | case SO_MARK: |
| 1208 | v.val = sk->sk_mark; |
| 1209 | break; |
| 1210 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1211 | case SO_RXQ_OVFL: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1212 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1213 | break; |
| 1214 | |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 1215 | case SO_WIFI_STATUS: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1216 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
Johannes Berg | 6e3e939 | 2011-11-09 10:15:42 +0100 | [diff] [blame] | 1217 | break; |
| 1218 | |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 1219 | case SO_PEEK_OFF: |
| 1220 | if (!sock->ops->set_peek_off) |
| 1221 | return -EOPNOTSUPP; |
| 1222 | |
| 1223 | v.val = sk->sk_peek_off; |
| 1224 | break; |
David S. Miller | bc2f799 | 2012-02-24 14:48:34 -0500 | [diff] [blame] | 1225 | case SO_NOFCS: |
Eric Dumazet | 1b23a5d | 2012-05-16 05:57:07 +0000 | [diff] [blame] | 1226 | v.val = sock_flag(sk, SOCK_NOFCS); |
David S. Miller | bc2f799 | 2012-02-24 14:48:34 -0500 | [diff] [blame] | 1227 | break; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1228 | |
Pavel Emelyanov | f7b86bf | 2012-10-18 23:55:56 +0000 | [diff] [blame] | 1229 | case SO_BINDTODEVICE: |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1230 | return sock_getbindtodevice(sk, optval, optlen, len); |
| 1231 | |
Pavel Emelyanov | a8fc927 | 2012-11-01 02:01:48 +0000 | [diff] [blame] | 1232 | case SO_GET_FILTER: |
| 1233 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); |
| 1234 | if (len < 0) |
| 1235 | return len; |
| 1236 | |
| 1237 | goto lenout; |
Brian Haley | c91f6df | 2012-11-26 05:21:08 +0000 | [diff] [blame] | 1238 | |
Vincent Bernat | d59577b | 2013-01-16 22:55:49 +0100 | [diff] [blame] | 1239 | case SO_LOCK_FILTER: |
| 1240 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); |
| 1241 | break; |
| 1242 | |
Michal Sekletar | ea02f94 | 2014-01-17 17:09:45 +0100 | [diff] [blame] | 1243 | case SO_BPF_EXTENSIONS: |
| 1244 | v.val = bpf_tell_extensions(); |
| 1245 | break; |
| 1246 | |
Keller, Jacob E | 7d4c04f | 2013-03-28 11:19:25 +0000 | [diff] [blame] | 1247 | case SO_SELECT_ERR_QUEUE: |
| 1248 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); |
| 1249 | break; |
| 1250 | |
Cong Wang | e0d1095 | 2013-08-01 11:10:25 +0800 | [diff] [blame] | 1251 | #ifdef CONFIG_NET_RX_BUSY_POLL |
Eliezer Tamir | 64b0dc5 | 2013-07-10 17:13:36 +0300 | [diff] [blame] | 1252 | case SO_BUSY_POLL: |
Eliezer Tamir | dafcc43 | 2013-06-14 16:33:57 +0300 | [diff] [blame] | 1253 | v.val = sk->sk_ll_usec; |
| 1254 | break; |
| 1255 | #endif |
| 1256 | |
Eric Dumazet | 62748f3 | 2013-09-24 08:20:52 -0700 | [diff] [blame] | 1257 | case SO_MAX_PACING_RATE: |
| 1258 | v.val = sk->sk_max_pacing_rate; |
| 1259 | break; |
| 1260 | |
Eric Dumazet | 2c8c56e | 2014-11-11 05:54:28 -0800 | [diff] [blame] | 1261 | case SO_INCOMING_CPU: |
| 1262 | v.val = sk->sk_incoming_cpu; |
| 1263 | break; |
| 1264 | |
Chenbo Feng | 3fe100e | 2017-04-05 19:00:55 -0700 | [diff] [blame] | 1265 | |
| 1266 | case SO_COOKIE: |
| 1267 | lv = sizeof(u64); |
| 1268 | if (len < lv) |
| 1269 | return -EINVAL; |
| 1270 | v.val64 = sock_gen_cookie(sk); |
| 1271 | break; |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1272 | default: |
YOSHIFUJI Hideaki/吉藤英明 | 443b599 | 2015-03-23 18:04:13 +0900 | [diff] [blame] | 1273 | /* We implement the SO_SNDLOWAT etc to not be settable |
| 1274 | * (1003.1g 7). |
| 1275 | */ |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 1276 | return -ENOPROTOOPT; |
| 1277 | } |
| 1278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | if (len > lv) |
| 1280 | len = lv; |
| 1281 | if (copy_to_user(optval, &v, len)) |
| 1282 | return -EFAULT; |
| 1283 | lenout: |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1284 | if (put_user(len, optlen)) |
| 1285 | return -EFAULT; |
| 1286 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | } |
| 1288 | |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1289 | /* |
| 1290 | * Initialize an sk_lock. |
| 1291 | * |
| 1292 | * (We also register the sk_lock with the lock validator.) |
| 1293 | */ |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 1294 | static inline void sock_lock_init(struct sock *sk) |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1295 | { |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1296 | sock_lock_init_class_and_name(sk, |
| 1297 | af_family_slock_key_strings[sk->sk_family], |
| 1298 | af_family_slock_keys + sk->sk_family, |
| 1299 | af_family_key_strings[sk->sk_family], |
| 1300 | af_family_keys + sk->sk_family); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 1301 | } |
| 1302 | |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 1303 | /* |
| 1304 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, |
| 1305 | * 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] | 1306 | * 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] | 1307 | */ |
Pavel Emelyanov | f1a6c4d | 2007-11-01 00:29:45 -0700 | [diff] [blame] | 1308 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
| 1309 | { |
| 1310 | #ifdef CONFIG_SECURITY_NETWORK |
| 1311 | void *sptr = nsk->sk_security; |
| 1312 | #endif |
Eric Dumazet | 68835ab | 2010-11-30 19:04:07 +0000 | [diff] [blame] | 1313 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
| 1314 | |
| 1315 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, |
| 1316 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); |
| 1317 | |
Pavel Emelyanov | f1a6c4d | 2007-11-01 00:29:45 -0700 | [diff] [blame] | 1318 | #ifdef CONFIG_SECURITY_NETWORK |
| 1319 | nsk->sk_security = sptr; |
| 1320 | security_sk_clone(osk, nsk); |
| 1321 | #endif |
| 1322 | } |
| 1323 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1324 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
| 1325 | int family) |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1326 | { |
| 1327 | struct sock *sk; |
| 1328 | struct kmem_cache *slab; |
| 1329 | |
| 1330 | slab = prot->slab; |
Eric Dumazet | e912b11 | 2009-07-08 19:36:05 +0000 | [diff] [blame] | 1331 | if (slab != NULL) { |
| 1332 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); |
| 1333 | if (!sk) |
| 1334 | return sk; |
Eric Dumazet | ba2489b | 2016-08-23 11:39:29 -0700 | [diff] [blame] | 1335 | if (priority & __GFP_ZERO) |
| 1336 | sk_prot_clear_nulls(sk, prot->obj_size); |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 1337 | } else |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1338 | sk = kmalloc(prot->obj_size, priority); |
| 1339 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1340 | if (sk != NULL) { |
Vegard Nossum | a98b65a | 2009-02-26 14:46:57 +0100 | [diff] [blame] | 1341 | kmemcheck_annotate_bitfield(sk, flags); |
| 1342 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1343 | if (security_sk_alloc(sk, family, priority)) |
| 1344 | goto out_free; |
| 1345 | |
| 1346 | if (!try_module_get(prot->owner)) |
| 1347 | goto out_free_sec; |
Krishna Kumar | e022f0b | 2009-10-19 23:46:20 +0000 | [diff] [blame] | 1348 | sk_tx_queue_clear(sk); |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1349 | } |
| 1350 | |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1351 | return sk; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1352 | |
| 1353 | out_free_sec: |
| 1354 | security_sk_free(sk); |
| 1355 | out_free: |
| 1356 | if (slab != NULL) |
| 1357 | kmem_cache_free(slab, sk); |
| 1358 | else |
| 1359 | kfree(sk); |
| 1360 | return NULL; |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1361 | } |
| 1362 | |
| 1363 | static void sk_prot_free(struct proto *prot, struct sock *sk) |
| 1364 | { |
| 1365 | struct kmem_cache *slab; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1366 | struct module *owner; |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1367 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1368 | owner = prot->owner; |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1369 | slab = prot->slab; |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1370 | |
Tejun Heo | bd1060a | 2015-12-07 17:38:53 -0500 | [diff] [blame] | 1371 | cgroup_sk_free(&sk->sk_cgrp_data); |
Johannes Weiner | 2d75807 | 2016-10-07 17:00:58 -0700 | [diff] [blame] | 1372 | mem_cgroup_sk_free(sk); |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1373 | security_sk_free(sk); |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1374 | if (slab != NULL) |
| 1375 | kmem_cache_free(slab, sk); |
| 1376 | else |
| 1377 | kfree(sk); |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1378 | module_put(owner); |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1379 | } |
| 1380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | /** |
| 1382 | * sk_alloc - All socket objects are allocated here |
Randy Dunlap | c4ea43c | 2007-10-12 21:17:49 -0700 | [diff] [blame] | 1383 | * @net: the applicable net namespace |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1384 | * @family: protocol family |
| 1385 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 1386 | * @prot: struct proto associated with this new sock instance |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 1387 | * @kern: is this to be a kernel socket? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | */ |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 1389 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 1390 | struct proto *prot, int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | { |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1392 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | |
Pavel Emelyanov | 154adbc | 2007-11-01 00:38:43 -0700 | [diff] [blame] | 1394 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | if (sk) { |
Pavel Emelyanov | 154adbc | 2007-11-01 00:38:43 -0700 | [diff] [blame] | 1396 | sk->sk_family = family; |
| 1397 | /* |
| 1398 | * See comment in struct sock definition to understand |
| 1399 | * why we need sk_prot_creator -acme |
| 1400 | */ |
| 1401 | sk->sk_prot = sk->sk_prot_creator = prot; |
| 1402 | sock_lock_init(sk); |
Eric W. Biederman | 26abe14 | 2015-05-08 21:10:31 -0500 | [diff] [blame] | 1403 | sk->sk_net_refcnt = kern ? 0 : 1; |
| 1404 | if (likely(sk->sk_net_refcnt)) |
| 1405 | get_net(net); |
| 1406 | sock_net_set(sk, net); |
Jarek Poplawski | d66ee05 | 2009-08-30 23:15:36 +0000 | [diff] [blame] | 1407 | atomic_set(&sk->sk_wmem_alloc, 1); |
Herbert Xu | f845172 | 2010-05-24 00:12:34 -0700 | [diff] [blame] | 1408 | |
Johannes Weiner | 2d75807 | 2016-10-07 17:00:58 -0700 | [diff] [blame] | 1409 | mem_cgroup_sk_alloc(sk); |
Johannes Weiner | d979a39 | 2016-09-19 14:44:38 -0700 | [diff] [blame] | 1410 | cgroup_sk_alloc(&sk->sk_cgrp_data); |
Tejun Heo | 2a56a1f | 2015-12-07 17:38:52 -0500 | [diff] [blame] | 1411 | sock_update_classid(&sk->sk_cgrp_data); |
| 1412 | sock_update_netprioidx(&sk->sk_cgrp_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | } |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1414 | |
Pavel Emelyanov | 2e4afe7 | 2007-11-01 00:36:26 -0700 | [diff] [blame] | 1415 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1417 | EXPORT_SYMBOL(sk_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | |
Eric Dumazet | a4298e4 | 2016-04-01 08:52:12 -0700 | [diff] [blame] | 1419 | /* Sockets having SOCK_RCU_FREE will call this function after one RCU |
| 1420 | * grace period. This is the case for UDP sockets and TCP listeners. |
| 1421 | */ |
| 1422 | static void __sk_destruct(struct rcu_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | { |
Eric Dumazet | a4298e4 | 2016-04-01 08:52:12 -0700 | [diff] [blame] | 1424 | struct sock *sk = container_of(head, struct sock, sk_rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | struct sk_filter *filter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | |
| 1427 | if (sk->sk_destruct) |
| 1428 | sk->sk_destruct(sk); |
| 1429 | |
Paul E. McKenney | a898def | 2010-02-22 17:04:49 -0800 | [diff] [blame] | 1430 | filter = rcu_dereference_check(sk->sk_filter, |
| 1431 | atomic_read(&sk->sk_wmem_alloc) == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | if (filter) { |
Pavel Emelyanov | 309dd5f | 2007-10-17 21:21:51 -0700 | [diff] [blame] | 1433 | sk_filter_uncharge(sk, filter); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 1434 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | } |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 1436 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
| 1437 | reuseport_detach_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 Dumazet | e9c1b1a | 2017-03-15 13:21:28 -0700 | [diff] [blame] | 1445 | if (sk->sk_frag.page) { |
| 1446 | put_page(sk->sk_frag.page); |
| 1447 | sk->sk_frag.page = NULL; |
| 1448 | } |
| 1449 | |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1450 | if (sk->sk_peer_cred) |
| 1451 | put_cred(sk->sk_peer_cred); |
| 1452 | put_pid(sk->sk_peer_pid); |
Eric W. Biederman | 26abe14 | 2015-05-08 21:10:31 -0500 | [diff] [blame] | 1453 | if (likely(sk->sk_net_refcnt)) |
| 1454 | put_net(sock_net(sk)); |
Pavel Emelyanov | c308c1b2 | 2007-11-01 00:33:50 -0700 | [diff] [blame] | 1455 | sk_prot_free(sk->sk_prot_creator, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | } |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1457 | |
Eric Dumazet | a4298e4 | 2016-04-01 08:52:12 -0700 | [diff] [blame] | 1458 | void sk_destruct(struct sock *sk) |
| 1459 | { |
| 1460 | if (sock_flag(sk, SOCK_RCU_FREE)) |
| 1461 | call_rcu(&sk->sk_rcu, __sk_destruct); |
| 1462 | else |
| 1463 | __sk_destruct(&sk->sk_rcu); |
| 1464 | } |
| 1465 | |
Craig Gallek | eb4cb00 | 2015-06-15 11:26:18 -0400 | [diff] [blame] | 1466 | static void __sk_free(struct sock *sk) |
| 1467 | { |
Craig Gallek | b922622 | 2015-06-30 12:49:32 -0400 | [diff] [blame] | 1468 | if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt)) |
Craig Gallek | eb4cb00 | 2015-06-15 11:26:18 -0400 | [diff] [blame] | 1469 | sock_diag_broadcast_destroy(sk); |
| 1470 | else |
| 1471 | sk_destruct(sk); |
| 1472 | } |
| 1473 | |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1474 | void sk_free(struct sock *sk) |
| 1475 | { |
| 1476 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1477 | * We subtract one from sk_wmem_alloc and can know if |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1478 | * some packets are still in some tx queue. |
| 1479 | * If not null, sock_wfree() will call __sk_free(sk) later |
| 1480 | */ |
| 1481 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) |
| 1482 | __sk_free(sk); |
| 1483 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1484 | EXPORT_SYMBOL(sk_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 1486 | /** |
| 1487 | * sk_clone_lock - clone a socket, and lock its clone |
| 1488 | * @sk: the socket to clone |
| 1489 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 1490 | * |
| 1491 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) |
| 1492 | */ |
| 1493 | 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] | 1494 | { |
Pavel Emelyanov | 8fd1d17 | 2007-11-01 00:37:32 -0700 | [diff] [blame] | 1495 | struct sock *newsk; |
Alexei Starovoitov | 278571b | 2014-07-30 20:34:12 -0700 | [diff] [blame] | 1496 | bool is_charged = true; |
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 | 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] | 1499 | if (newsk != NULL) { |
| 1500 | struct sk_filter *filter; |
| 1501 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 1502 | sock_copy(newsk, sk); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1503 | |
Christoph Paasch | cf2eaf1 | 2017-09-26 17:38:50 -0700 | [diff] [blame] | 1504 | newsk->sk_prot_creator = sk->sk_prot; |
| 1505 | |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1506 | /* SANITY */ |
Sowmini Varadhan | 8a68173 | 2015-07-30 15:50:36 +0200 | [diff] [blame] | 1507 | if (likely(newsk->sk_net_refcnt)) |
| 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 | |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1524 | rwlock_init(&newsk->sk_callback_lock); |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 1525 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
| 1526 | af_callback_keys + newsk->sk_family, |
| 1527 | af_family_clock_key_strings[newsk->sk_family]); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1528 | |
| 1529 | newsk->sk_dst_cache = NULL; |
| 1530 | newsk->sk_wmem_queued = 0; |
| 1531 | newsk->sk_forward_alloc = 0; |
Eric Dumazet | 9caad86 | 2016-04-01 08:52:20 -0700 | [diff] [blame] | 1532 | atomic_set(&newsk->sk_drops, 0); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 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 | |
Greg Kroah-Hartman | 0044962 | 2017-10-12 21:21:39 +0200 | [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 | |
Eric Dumazet | d188ba8 | 2015-12-08 07:22:02 -0800 | [diff] [blame] | 1547 | if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { |
Daniel Borkmann | a53ea60 | 2017-03-22 13:08:08 +0100 | [diff] [blame] | 1548 | /* We need to make sure that we don't uncharge the new |
| 1549 | * socket if we couldn't charge it in the first place |
| 1550 | * as otherwise we uncharge the parent's filter. |
| 1551 | */ |
| 1552 | if (!is_charged) |
| 1553 | RCU_INIT_POINTER(newsk->sk_filter, NULL); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1554 | /* It is still raw copy of parent, so invalidate |
| 1555 | * destructor and make plain sk_free() */ |
| 1556 | newsk->sk_destruct = NULL; |
Thomas Gleixner | b0691c8 | 2011-10-25 02:30:50 +0000 | [diff] [blame] | 1557 | bh_unlock_sock(newsk); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1558 | sk_free(newsk); |
| 1559 | newsk = NULL; |
| 1560 | goto out; |
| 1561 | } |
Craig Gallek | fa46349 | 2016-02-10 11:50:39 -0500 | [diff] [blame] | 1562 | RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1563 | |
| 1564 | newsk->sk_err = 0; |
Eric Dumazet | e551c32 | 2016-10-28 13:40:24 -0700 | [diff] [blame] | 1565 | newsk->sk_err_soft = 0; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1566 | newsk->sk_priority = 0; |
Eric Dumazet | 2c8c56e | 2014-11-11 05:54:28 -0800 | [diff] [blame] | 1567 | newsk->sk_incoming_cpu = raw_smp_processor_id(); |
Eric Dumazet | 33cf7c9 | 2015-03-11 18:53:14 -0700 | [diff] [blame] | 1568 | atomic64_set(&newsk->sk_cookie, 0); |
Johannes Weiner | d979a39 | 2016-09-19 14:44:38 -0700 | [diff] [blame] | 1569 | |
Johannes Weiner | 2d75807 | 2016-10-07 17:00:58 -0700 | [diff] [blame] | 1570 | mem_cgroup_sk_alloc(newsk); |
Johannes Weiner | d979a39 | 2016-09-19 14:44:38 -0700 | [diff] [blame] | 1571 | cgroup_sk_alloc(&newsk->sk_cgrp_data); |
| 1572 | |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 1573 | /* |
| 1574 | * Before updating sk_refcnt, we must commit prior changes to memory |
| 1575 | * (Documentation/RCU/rculist_nulls.txt for details) |
| 1576 | */ |
| 1577 | smp_wmb(); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1578 | atomic_set(&newsk->sk_refcnt, 2); |
| 1579 | |
| 1580 | /* |
| 1581 | * Increment the counter in the same struct proto as the master |
| 1582 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that |
| 1583 | * is the same as sk->sk_prot->socks, as this field was copied |
| 1584 | * with memcpy). |
| 1585 | * |
| 1586 | * This _changes_ the previous behaviour, where |
| 1587 | * tcp_create_openreq_child always was incrementing the |
| 1588 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have |
| 1589 | * to be taken into account in all callers. -acme |
| 1590 | */ |
| 1591 | sk_refcnt_debug_inc(newsk); |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 1592 | sk_set_socket(newsk, NULL); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1593 | newsk->sk_wq = NULL; |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1594 | |
| 1595 | if (newsk->sk_prot->sockets_allocated) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 1596 | sk_sockets_allocated_inc(newsk); |
Octavian Purdila | 704da560 | 2010-01-08 00:00:09 -0800 | [diff] [blame] | 1597 | |
Hannes Frederic Sowa | 080a270 | 2015-10-26 13:51:37 +0100 | [diff] [blame] | 1598 | if (sock_needs_netstamp(sk) && |
| 1599 | newsk->sk_flags & SK_FLAGS_TIMESTAMP) |
Octavian Purdila | 704da560 | 2010-01-08 00:00:09 -0800 | [diff] [blame] | 1600 | net_enable_timestamp(); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1601 | } |
| 1602 | out: |
| 1603 | return newsk; |
| 1604 | } |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 1605 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 1606 | |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1607 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
| 1608 | { |
Eric Dumazet | d6a4e26 | 2015-05-26 08:55:28 -0700 | [diff] [blame] | 1609 | u32 max_segs = 1; |
| 1610 | |
Eric Dumazet | 6bd4f35 | 2015-12-02 21:53:57 -0800 | [diff] [blame] | 1611 | sk_dst_set(sk, dst); |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1612 | sk->sk_route_caps = dst->dev->features; |
| 1613 | if (sk->sk_route_caps & NETIF_F_GSO) |
Herbert Xu | 4fcd6b9 | 2007-05-31 22:15:50 -0700 | [diff] [blame] | 1614 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 1615 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1616 | if (sk_can_gso(sk)) { |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1617 | if (dst->header_len) { |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1618 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1619 | } else { |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1620 | 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] | 1621 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
Eric Dumazet | d6a4e26 | 2015-05-26 08:55:28 -0700 | [diff] [blame] | 1622 | max_segs = max_t(u32, dst->dev->gso_max_segs, 1); |
Peter P Waskiewicz Jr | 82cc1a7 | 2008-03-21 03:43:19 -0700 | [diff] [blame] | 1623 | } |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1624 | } |
Eric Dumazet | d6a4e26 | 2015-05-26 08:55:28 -0700 | [diff] [blame] | 1625 | sk->sk_gso_max_segs = max_segs; |
Andi Kleen | 9958089 | 2007-04-20 17:12:43 -0700 | [diff] [blame] | 1626 | } |
| 1627 | EXPORT_SYMBOL_GPL(sk_setup_caps); |
| 1628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | /* |
| 1630 | * Simple resource managers for sockets. |
| 1631 | */ |
| 1632 | |
| 1633 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1634 | /* |
| 1635 | * Write buffer destructor automatically called from kfree_skb. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | */ |
| 1637 | void sock_wfree(struct sk_buff *skb) |
| 1638 | { |
| 1639 | struct sock *sk = skb->sk; |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1640 | unsigned int len = skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1642 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
| 1643 | /* |
| 1644 | * Keep a reference on sk_wmem_alloc, this will be released |
| 1645 | * after sk_write_space() call |
| 1646 | */ |
| 1647 | atomic_sub(len - 1, &sk->sk_wmem_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | sk->sk_write_space(sk); |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1649 | len = 1; |
| 1650 | } |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1651 | /* |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1652 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
| 1653 | * could not do because of in-flight packets |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1654 | */ |
Eric Dumazet | d99927f | 2009-09-24 10:49:24 +0000 | [diff] [blame] | 1655 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
Eric Dumazet | 2b85a34 | 2009-06-11 02:55:43 -0700 | [diff] [blame] | 1656 | __sk_free(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1658 | EXPORT_SYMBOL(sock_wfree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | |
Eric Dumazet | 1d2077a | 2016-05-02 10:56:27 -0700 | [diff] [blame] | 1660 | /* This variant of sock_wfree() is used by TCP, |
| 1661 | * since it sets SOCK_USE_WRITE_QUEUE. |
| 1662 | */ |
| 1663 | void __sock_wfree(struct sk_buff *skb) |
| 1664 | { |
| 1665 | struct sock *sk = skb->sk; |
| 1666 | |
| 1667 | if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) |
| 1668 | __sk_free(sk); |
| 1669 | } |
| 1670 | |
Eric Dumazet | 9e17f8a | 2015-11-01 15:36:55 -0800 | [diff] [blame] | 1671 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
| 1672 | { |
| 1673 | skb_orphan(skb); |
| 1674 | skb->sk = sk; |
| 1675 | #ifdef CONFIG_INET |
| 1676 | if (unlikely(!sk_fullsock(sk))) { |
| 1677 | skb->destructor = sock_edemux; |
| 1678 | sock_hold(sk); |
| 1679 | return; |
| 1680 | } |
| 1681 | #endif |
| 1682 | skb->destructor = sock_wfree; |
| 1683 | skb_set_hash_from_sk(skb, sk); |
| 1684 | /* |
| 1685 | * We used to take a refcount on sk, but following operation |
| 1686 | * is enough to guarantee sk_free() wont free this sock until |
| 1687 | * all in-flight packets are completed |
| 1688 | */ |
| 1689 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
| 1690 | } |
| 1691 | EXPORT_SYMBOL(skb_set_owner_w); |
| 1692 | |
Eric Dumazet | 1d2077a | 2016-05-02 10:56:27 -0700 | [diff] [blame] | 1693 | /* This helper is used by netem, as it can hold packets in its |
| 1694 | * delay queue. We want to allow the owner socket to send more |
| 1695 | * packets, as if they were already TX completed by a typical driver. |
| 1696 | * But we also want to keep skb->sk set because some packet schedulers |
Eric Dumazet | 5d165da | 2017-05-11 15:24:41 -0700 | [diff] [blame] | 1697 | * rely on it (sch_fq for example). |
Eric Dumazet | 1d2077a | 2016-05-02 10:56:27 -0700 | [diff] [blame] | 1698 | */ |
Eric Dumazet | f2f872f | 2013-07-30 17:55:08 -0700 | [diff] [blame] | 1699 | void skb_orphan_partial(struct sk_buff *skb) |
| 1700 | { |
Eric Dumazet | 5d165da | 2017-05-11 15:24:41 -0700 | [diff] [blame] | 1701 | if (skb_is_tcp_pure_ack(skb)) |
Eric Dumazet | 1d2077a | 2016-05-02 10:56:27 -0700 | [diff] [blame] | 1702 | return; |
| 1703 | |
Eric Dumazet | f2f872f | 2013-07-30 17:55:08 -0700 | [diff] [blame] | 1704 | if (skb->destructor == sock_wfree |
| 1705 | #ifdef CONFIG_INET |
| 1706 | || skb->destructor == tcp_wfree |
| 1707 | #endif |
| 1708 | ) { |
Eric Dumazet | 5d165da | 2017-05-11 15:24:41 -0700 | [diff] [blame] | 1709 | struct sock *sk = skb->sk; |
| 1710 | |
| 1711 | if (atomic_inc_not_zero(&sk->sk_refcnt)) { |
| 1712 | atomic_sub(skb->truesize, &sk->sk_wmem_alloc); |
| 1713 | skb->destructor = sock_efree; |
| 1714 | } |
Eric Dumazet | f2f872f | 2013-07-30 17:55:08 -0700 | [diff] [blame] | 1715 | } else { |
| 1716 | skb_orphan(skb); |
| 1717 | } |
| 1718 | } |
| 1719 | EXPORT_SYMBOL(skb_orphan_partial); |
| 1720 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1721 | /* |
| 1722 | * Read buffer destructor automatically called from kfree_skb. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | */ |
| 1724 | void sock_rfree(struct sk_buff *skb) |
| 1725 | { |
| 1726 | struct sock *sk = skb->sk; |
Eric Dumazet | d361fd5 | 2010-07-10 22:45:17 +0000 | [diff] [blame] | 1727 | unsigned int len = skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | |
Eric Dumazet | d361fd5 | 2010-07-10 22:45:17 +0000 | [diff] [blame] | 1729 | atomic_sub(len, &sk->sk_rmem_alloc); |
| 1730 | sk_mem_uncharge(sk, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1732 | EXPORT_SYMBOL(sock_rfree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | |
Oliver Hartkopp | 7768eed | 2015-03-10 19:03:46 +0100 | [diff] [blame] | 1734 | /* |
| 1735 | * Buffer destructor for skbs that are not used directly in read or write |
| 1736 | * path, e.g. for error handler skbs. Automatically called from kfree_skb. |
| 1737 | */ |
Alexander Duyck | 62bccb8 | 2014-09-04 13:31:35 -0400 | [diff] [blame] | 1738 | void sock_efree(struct sk_buff *skb) |
| 1739 | { |
| 1740 | sock_put(skb->sk); |
| 1741 | } |
| 1742 | EXPORT_SYMBOL(sock_efree); |
| 1743 | |
Eric W. Biederman | 976d0201 | 2012-05-23 17:16:53 -0600 | [diff] [blame] | 1744 | kuid_t sock_i_uid(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | { |
Eric W. Biederman | 976d0201 | 2012-05-23 17:16:53 -0600 | [diff] [blame] | 1746 | kuid_t uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1748 | read_lock_bh(&sk->sk_callback_lock); |
Eric W. Biederman | 976d0201 | 2012-05-23 17:16:53 -0600 | [diff] [blame] | 1749 | 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] | 1750 | read_unlock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | return uid; |
| 1752 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1753 | EXPORT_SYMBOL(sock_i_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | |
| 1755 | unsigned long sock_i_ino(struct sock *sk) |
| 1756 | { |
| 1757 | unsigned long ino; |
| 1758 | |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1759 | read_lock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
Eric Dumazet | f064af1 | 2010-09-22 12:43:39 +0000 | [diff] [blame] | 1761 | read_unlock_bh(&sk->sk_callback_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | return ino; |
| 1763 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1764 | EXPORT_SYMBOL(sock_i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | |
| 1766 | /* |
| 1767 | * Allocate a skb from the socket's send buffer. |
| 1768 | */ |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 1769 | 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] | 1770 | gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | { |
| 1772 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1773 | struct sk_buff *skb = alloc_skb(size, priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | if (skb) { |
| 1775 | skb_set_owner_w(skb, sk); |
| 1776 | return skb; |
| 1777 | } |
| 1778 | } |
| 1779 | return NULL; |
| 1780 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1781 | EXPORT_SYMBOL(sock_wmalloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | |
| 1783 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | * Allocate a memory block from the socket's option memory buffer. |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1785 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1786 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1788 | if ((unsigned int)size <= sysctl_optmem_max && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
| 1790 | void *mem; |
| 1791 | /* First do the add, to avoid the race if kmalloc |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1792 | * might sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | */ |
| 1794 | atomic_add(size, &sk->sk_omem_alloc); |
| 1795 | mem = kmalloc(size, priority); |
| 1796 | if (mem) |
| 1797 | return mem; |
| 1798 | atomic_sub(size, &sk->sk_omem_alloc); |
| 1799 | } |
| 1800 | return NULL; |
| 1801 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1802 | EXPORT_SYMBOL(sock_kmalloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1804 | /* Free an option memory block. Note, we actually want the inline |
| 1805 | * here as this allows gcc to detect the nullify and fold away the |
| 1806 | * condition entirely. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | */ |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1808 | static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
| 1809 | const bool nullify) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | { |
David S. Miller | e53da5f | 2014-10-14 17:02:37 -0400 | [diff] [blame] | 1811 | if (WARN_ON_ONCE(!mem)) |
| 1812 | return; |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1813 | if (nullify) |
| 1814 | kzfree(mem); |
| 1815 | else |
| 1816 | kfree(mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | atomic_sub(size, &sk->sk_omem_alloc); |
| 1818 | } |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1819 | |
| 1820 | void sock_kfree_s(struct sock *sk, void *mem, int size) |
| 1821 | { |
| 1822 | __sock_kfree_s(sk, mem, size, false); |
| 1823 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1824 | EXPORT_SYMBOL(sock_kfree_s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | |
Daniel Borkmann | 79e8865 | 2014-11-19 17:13:11 +0100 | [diff] [blame] | 1826 | void sock_kzfree_s(struct sock *sk, void *mem, int size) |
| 1827 | { |
| 1828 | __sock_kfree_s(sk, mem, size, true); |
| 1829 | } |
| 1830 | EXPORT_SYMBOL(sock_kzfree_s); |
| 1831 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
| 1833 | I think, these locks should be removed for datagram sockets. |
| 1834 | */ |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1835 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | { |
| 1837 | DEFINE_WAIT(wait); |
| 1838 | |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 1839 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | for (;;) { |
| 1841 | if (!timeo) |
| 1842 | break; |
| 1843 | if (signal_pending(current)) |
| 1844 | break; |
| 1845 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1846 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
| 1848 | break; |
| 1849 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1850 | break; |
| 1851 | if (sk->sk_err) |
| 1852 | break; |
| 1853 | timeo = schedule_timeout(timeo); |
| 1854 | } |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1855 | finish_wait(sk_sleep(sk), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | return timeo; |
| 1857 | } |
| 1858 | |
| 1859 | |
| 1860 | /* |
| 1861 | * Generic send/receive buffer handlers |
| 1862 | */ |
| 1863 | |
Herbert Xu | 4cc7f68 | 2009-02-04 16:55:54 -0800 | [diff] [blame] | 1864 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
| 1865 | unsigned long data_len, int noblock, |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 1866 | int *errcode, int max_page_order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | { |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1868 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | long timeo; |
| 1870 | int err; |
| 1871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | timeo = sock_sndtimeo(sk, noblock); |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1873 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | err = sock_error(sk); |
| 1875 | if (err != 0) |
| 1876 | goto failure; |
| 1877 | |
| 1878 | err = -EPIPE; |
| 1879 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1880 | goto failure; |
| 1881 | |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1882 | if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
| 1883 | break; |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 1884 | |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 1885 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1886 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 1887 | err = -EAGAIN; |
| 1888 | if (!timeo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1889 | goto failure; |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1890 | if (signal_pending(current)) |
| 1891 | goto interrupted; |
| 1892 | timeo = sock_wait_for_wmem(sk, timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | } |
Eric Dumazet | 2e4e441 | 2014-09-17 04:49:49 -0700 | [diff] [blame] | 1894 | skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
| 1895 | errcode, sk->sk_allocation); |
| 1896 | if (skb) |
| 1897 | skb_set_owner_w(skb, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | return skb; |
| 1899 | |
| 1900 | interrupted: |
| 1901 | err = sock_intr_errno(timeo); |
| 1902 | failure: |
| 1903 | *errcode = err; |
| 1904 | return NULL; |
| 1905 | } |
Herbert Xu | 4cc7f68 | 2009-02-04 16:55:54 -0800 | [diff] [blame] | 1906 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1908 | 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] | 1909 | int noblock, int *errcode) |
| 1910 | { |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 1911 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 1913 | EXPORT_SYMBOL(sock_alloc_send_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | |
Willem de Bruijn | 39771b1 | 2016-04-02 23:08:06 -0400 | [diff] [blame] | 1915 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
| 1916 | struct sockcm_cookie *sockc) |
| 1917 | { |
Soheil Hassas Yeganeh | 3dd17e6 | 2016-04-02 23:08:09 -0400 | [diff] [blame] | 1918 | u32 tsflags; |
| 1919 | |
Willem de Bruijn | 39771b1 | 2016-04-02 23:08:06 -0400 | [diff] [blame] | 1920 | switch (cmsg->cmsg_type) { |
| 1921 | case SO_MARK: |
| 1922 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
| 1923 | return -EPERM; |
| 1924 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) |
| 1925 | return -EINVAL; |
| 1926 | sockc->mark = *(u32 *)CMSG_DATA(cmsg); |
| 1927 | break; |
Soheil Hassas Yeganeh | 3dd17e6 | 2016-04-02 23:08:09 -0400 | [diff] [blame] | 1928 | case SO_TIMESTAMPING: |
| 1929 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) |
| 1930 | return -EINVAL; |
| 1931 | |
| 1932 | tsflags = *(u32 *)CMSG_DATA(cmsg); |
| 1933 | if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK) |
| 1934 | return -EINVAL; |
| 1935 | |
| 1936 | sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK; |
| 1937 | sockc->tsflags |= tsflags; |
| 1938 | break; |
Soheil Hassas Yeganeh | 779f1ed | 2016-07-11 16:51:26 -0400 | [diff] [blame] | 1939 | /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */ |
| 1940 | case SCM_RIGHTS: |
| 1941 | case SCM_CREDENTIALS: |
| 1942 | break; |
Willem de Bruijn | 39771b1 | 2016-04-02 23:08:06 -0400 | [diff] [blame] | 1943 | default: |
| 1944 | return -EINVAL; |
| 1945 | } |
| 1946 | return 0; |
| 1947 | } |
| 1948 | EXPORT_SYMBOL(__sock_cmsg_send); |
| 1949 | |
Edward Jee | f28ea36 | 2015-10-08 14:56:48 -0700 | [diff] [blame] | 1950 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
| 1951 | struct sockcm_cookie *sockc) |
| 1952 | { |
| 1953 | struct cmsghdr *cmsg; |
Willem de Bruijn | 39771b1 | 2016-04-02 23:08:06 -0400 | [diff] [blame] | 1954 | int ret; |
Edward Jee | f28ea36 | 2015-10-08 14:56:48 -0700 | [diff] [blame] | 1955 | |
| 1956 | for_each_cmsghdr(cmsg, msg) { |
| 1957 | if (!CMSG_OK(msg, cmsg)) |
| 1958 | return -EINVAL; |
| 1959 | if (cmsg->cmsg_level != SOL_SOCKET) |
| 1960 | continue; |
Willem de Bruijn | 39771b1 | 2016-04-02 23:08:06 -0400 | [diff] [blame] | 1961 | ret = __sock_cmsg_send(sk, msg, cmsg, sockc); |
| 1962 | if (ret) |
| 1963 | return ret; |
Edward Jee | f28ea36 | 2015-10-08 14:56:48 -0700 | [diff] [blame] | 1964 | } |
| 1965 | return 0; |
| 1966 | } |
| 1967 | EXPORT_SYMBOL(sock_cmsg_send); |
| 1968 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1969 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
| 1970 | #define SKB_FRAG_PAGE_ORDER get_order(32768) |
| 1971 | |
Eric Dumazet | 400dfd3 | 2013-10-17 16:27:07 -0700 | [diff] [blame] | 1972 | /** |
| 1973 | * skb_page_frag_refill - check that a page_frag contains enough room |
| 1974 | * @sz: minimum size of the fragment we want to get |
| 1975 | * @pfrag: pointer to page_frag |
Eric Dumazet | 82d5e2b | 2014-09-08 04:00:00 -0700 | [diff] [blame] | 1976 | * @gfp: priority for memory allocation |
Eric Dumazet | 400dfd3 | 2013-10-17 16:27:07 -0700 | [diff] [blame] | 1977 | * |
| 1978 | * Note: While this allocator tries to use high order pages, there is |
| 1979 | * no guarantee that allocations succeed. Therefore, @sz MUST be |
| 1980 | * less or equal than PAGE_SIZE. |
| 1981 | */ |
Eric Dumazet | d9b2938 | 2014-08-27 20:49:34 -0700 | [diff] [blame] | 1982 | 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] | 1983 | { |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1984 | if (pfrag->page) { |
Joonsoo Kim | fe896d1 | 2016-03-17 14:19:26 -0700 | [diff] [blame] | 1985 | if (page_ref_count(pfrag->page) == 1) { |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1986 | pfrag->offset = 0; |
| 1987 | return true; |
| 1988 | } |
Eric Dumazet | 400dfd3 | 2013-10-17 16:27:07 -0700 | [diff] [blame] | 1989 | if (pfrag->offset + sz <= pfrag->size) |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1990 | return true; |
| 1991 | put_page(pfrag->page); |
| 1992 | } |
| 1993 | |
Eric Dumazet | d9b2938 | 2014-08-27 20:49:34 -0700 | [diff] [blame] | 1994 | pfrag->offset = 0; |
| 1995 | if (SKB_FRAG_PAGE_ORDER) { |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1996 | /* Avoid direct reclaim but allow kswapd to wake */ |
| 1997 | pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | |
| 1998 | __GFP_COMP | __GFP_NOWARN | |
| 1999 | __GFP_NORETRY, |
Eric Dumazet | d9b2938 | 2014-08-27 20:49:34 -0700 | [diff] [blame] | 2000 | SKB_FRAG_PAGE_ORDER); |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2001 | if (likely(pfrag->page)) { |
Eric Dumazet | d9b2938 | 2014-08-27 20:49:34 -0700 | [diff] [blame] | 2002 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2003 | return true; |
| 2004 | } |
Eric Dumazet | d9b2938 | 2014-08-27 20:49:34 -0700 | [diff] [blame] | 2005 | } |
| 2006 | pfrag->page = alloc_page(gfp); |
| 2007 | if (likely(pfrag->page)) { |
| 2008 | pfrag->size = PAGE_SIZE; |
| 2009 | return true; |
| 2010 | } |
Eric Dumazet | 400dfd3 | 2013-10-17 16:27:07 -0700 | [diff] [blame] | 2011 | return false; |
| 2012 | } |
| 2013 | EXPORT_SYMBOL(skb_page_frag_refill); |
| 2014 | |
| 2015 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) |
| 2016 | { |
| 2017 | if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) |
| 2018 | return true; |
| 2019 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2020 | sk_enter_memory_pressure(sk); |
| 2021 | sk_stream_moderate_sndbuf(sk); |
| 2022 | return false; |
| 2023 | } |
| 2024 | EXPORT_SYMBOL(sk_page_frag_refill); |
| 2025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | static void __lock_sock(struct sock *sk) |
Namhyung Kim | f39234d | 2010-09-08 03:48:48 +0000 | [diff] [blame] | 2027 | __releases(&sk->sk_lock.slock) |
| 2028 | __acquires(&sk->sk_lock.slock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2029 | { |
| 2030 | DEFINE_WAIT(wait); |
| 2031 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 2032 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
| 2034 | TASK_UNINTERRUPTIBLE); |
| 2035 | spin_unlock_bh(&sk->sk_lock.slock); |
| 2036 | schedule(); |
| 2037 | spin_lock_bh(&sk->sk_lock.slock); |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 2038 | if (!sock_owned_by_user(sk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | break; |
| 2040 | } |
| 2041 | finish_wait(&sk->sk_lock.wq, &wait); |
| 2042 | } |
| 2043 | |
| 2044 | static void __release_sock(struct sock *sk) |
Namhyung Kim | f39234d | 2010-09-08 03:48:48 +0000 | [diff] [blame] | 2045 | __releases(&sk->sk_lock.slock) |
| 2046 | __acquires(&sk->sk_lock.slock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | { |
Eric Dumazet | 5413d1b | 2016-04-29 14:16:52 -0700 | [diff] [blame] | 2048 | struct sk_buff *skb, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | |
Eric Dumazet | 5413d1b | 2016-04-29 14:16:52 -0700 | [diff] [blame] | 2050 | while ((skb = sk->sk_backlog.head) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
Eric Dumazet | 5413d1b | 2016-04-29 14:16:52 -0700 | [diff] [blame] | 2052 | |
| 2053 | spin_unlock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | |
| 2055 | do { |
Eric Dumazet | 5413d1b | 2016-04-29 14:16:52 -0700 | [diff] [blame] | 2056 | next = skb->next; |
Eric Dumazet | e4cbb02 | 2012-04-30 16:07:09 +0000 | [diff] [blame] | 2057 | prefetch(next); |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 2058 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | skb->next = NULL; |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 2060 | sk_backlog_rcv(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | |
Eric Dumazet | 5413d1b | 2016-04-29 14:16:52 -0700 | [diff] [blame] | 2062 | cond_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | |
| 2064 | skb = next; |
| 2065 | } while (skb != NULL); |
| 2066 | |
Eric Dumazet | 5413d1b | 2016-04-29 14:16:52 -0700 | [diff] [blame] | 2067 | spin_lock_bh(&sk->sk_lock.slock); |
| 2068 | } |
Zhu Yi | 8eae939 | 2010-03-04 18:01:40 +0000 | [diff] [blame] | 2069 | |
| 2070 | /* |
| 2071 | * Doing the zeroing here guarantee we can not loop forever |
| 2072 | * while a wild producer attempts to flood us. |
| 2073 | */ |
| 2074 | sk->sk_backlog.len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | } |
| 2076 | |
Eric Dumazet | d41a69f | 2016-04-29 14:16:53 -0700 | [diff] [blame] | 2077 | void __sk_flush_backlog(struct sock *sk) |
| 2078 | { |
| 2079 | spin_lock_bh(&sk->sk_lock.slock); |
| 2080 | __release_sock(sk); |
| 2081 | spin_unlock_bh(&sk->sk_lock.slock); |
| 2082 | } |
| 2083 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | /** |
| 2085 | * sk_wait_data - wait for data to arrive at sk_receive_queue |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 2086 | * @sk: sock to wait on |
| 2087 | * @timeo: for how long |
Sabrina Dubroca | dfbafc9 | 2015-07-24 18:19:25 +0200 | [diff] [blame] | 2088 | * @skb: last skb seen on sk_receive_queue |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | * |
| 2090 | * Now socket state including sk->sk_err is changed only under lock, |
| 2091 | * hence we may omit checks after joining wait queue. |
| 2092 | * We check receive queue before schedule() only as optimization; |
| 2093 | * it is very likely that release_sock() added new data. |
| 2094 | */ |
Sabrina Dubroca | dfbafc9 | 2015-07-24 18:19:25 +0200 | [diff] [blame] | 2095 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | { |
| 2097 | int rc; |
| 2098 | DEFINE_WAIT(wait); |
| 2099 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 2100 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 2101 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
Sabrina Dubroca | dfbafc9 | 2015-07-24 18:19:25 +0200 | [diff] [blame] | 2102 | rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb); |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 2103 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 2104 | finish_wait(sk_sleep(sk), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | return rc; |
| 2106 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | EXPORT_SYMBOL(sk_wait_data); |
| 2108 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2109 | /** |
| 2110 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated |
| 2111 | * @sk: socket |
| 2112 | * @size: memory size to allocate |
| 2113 | * @kind: allocation type |
| 2114 | * |
| 2115 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means |
| 2116 | * rmem allocation. This function assumes that protocols which have |
| 2117 | * memory_pressure use sk_wmem_queued as write buffer accounting. |
| 2118 | */ |
| 2119 | int __sk_mem_schedule(struct sock *sk, int size, int kind) |
| 2120 | { |
| 2121 | struct proto *prot = sk->sk_prot; |
| 2122 | int amt = sk_mem_pages(size); |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 2123 | long allocated; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2124 | |
| 2125 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2126 | |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 2127 | allocated = sk_memory_allocated_add(sk, amt); |
| 2128 | |
Johannes Weiner | baac50b | 2016-01-14 15:21:17 -0800 | [diff] [blame] | 2129 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
| 2130 | !mem_cgroup_charge_skmem(sk->sk_memcg, amt)) |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 2131 | goto suppress_allocation; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2132 | |
| 2133 | /* Under limit. */ |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 2134 | if (allocated <= sk_prot_mem_limits(sk, 0)) { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2135 | sk_leave_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2136 | return 1; |
| 2137 | } |
| 2138 | |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 2139 | /* Under pressure. */ |
| 2140 | if (allocated > sk_prot_mem_limits(sk, 1)) |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2141 | sk_enter_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2142 | |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 2143 | /* Over hard limit. */ |
| 2144 | if (allocated > sk_prot_mem_limits(sk, 2)) |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2145 | goto suppress_allocation; |
| 2146 | |
| 2147 | /* guarantee minimum buffer size under pressure */ |
| 2148 | if (kind == SK_MEM_RECV) { |
| 2149 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) |
| 2150 | return 1; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2151 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2152 | } else { /* SK_MEM_SEND */ |
| 2153 | if (sk->sk_type == SOCK_STREAM) { |
| 2154 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) |
| 2155 | return 1; |
| 2156 | } else if (atomic_read(&sk->sk_wmem_alloc) < |
| 2157 | prot->sysctl_wmem[0]) |
| 2158 | return 1; |
| 2159 | } |
| 2160 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2161 | if (sk_has_memory_pressure(sk)) { |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 2162 | int alloc; |
| 2163 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2164 | if (!sk_under_memory_pressure(sk)) |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 2165 | return 1; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2166 | alloc = sk_sockets_allocated_read_positive(sk); |
| 2167 | if (sk_prot_mem_limits(sk, 2) > alloc * |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2168 | sk_mem_pages(sk->sk_wmem_queued + |
| 2169 | atomic_read(&sk->sk_rmem_alloc) + |
| 2170 | sk->sk_forward_alloc)) |
| 2171 | return 1; |
| 2172 | } |
| 2173 | |
| 2174 | suppress_allocation: |
| 2175 | |
| 2176 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { |
| 2177 | sk_stream_moderate_sndbuf(sk); |
| 2178 | |
| 2179 | /* Fail only if socket is _under_ its sndbuf. |
| 2180 | * In this case we cannot block, so that we have to fail. |
| 2181 | */ |
| 2182 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) |
| 2183 | return 1; |
| 2184 | } |
| 2185 | |
Satoru Moriya | 3847ce3 | 2011-06-17 12:00:03 +0000 | [diff] [blame] | 2186 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
| 2187 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2188 | /* Alas. Undo changes. */ |
| 2189 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2190 | |
Glauber Costa | 0e90b31 | 2012-01-20 04:57:16 +0000 | [diff] [blame] | 2191 | sk_memory_allocated_sub(sk, amt); |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2192 | |
Johannes Weiner | baac50b | 2016-01-14 15:21:17 -0800 | [diff] [blame] | 2193 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
| 2194 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 2195 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2196 | return 0; |
| 2197 | } |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2198 | EXPORT_SYMBOL(__sk_mem_schedule); |
| 2199 | |
| 2200 | /** |
Jean Sacren | 69dba9b | 2015-08-27 18:05:49 -0600 | [diff] [blame] | 2201 | * __sk_mem_reclaim - reclaim memory_allocated |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2202 | * @sk: socket |
Eric Dumazet | 1a24e04 | 2015-05-15 12:39:25 -0700 | [diff] [blame] | 2203 | * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2204 | */ |
Eric Dumazet | 1a24e04 | 2015-05-15 12:39:25 -0700 | [diff] [blame] | 2205 | void __sk_mem_reclaim(struct sock *sk, int amount) |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2206 | { |
Eric Dumazet | 1a24e04 | 2015-05-15 12:39:25 -0700 | [diff] [blame] | 2207 | amount >>= SK_MEM_QUANTUM_SHIFT; |
| 2208 | sk_memory_allocated_sub(sk, amount); |
| 2209 | sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2210 | |
Johannes Weiner | baac50b | 2016-01-14 15:21:17 -0800 | [diff] [blame] | 2211 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
| 2212 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); |
Johannes Weiner | e805605 | 2016-01-14 15:21:14 -0800 | [diff] [blame] | 2213 | |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2214 | if (sk_under_memory_pressure(sk) && |
| 2215 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) |
| 2216 | sk_leave_memory_pressure(sk); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2217 | } |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2218 | EXPORT_SYMBOL(__sk_mem_reclaim); |
| 2219 | |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 2220 | int sk_set_peek_off(struct sock *sk, int val) |
| 2221 | { |
| 2222 | if (val < 0) |
| 2223 | return -EINVAL; |
| 2224 | |
| 2225 | sk->sk_peek_off = val; |
| 2226 | return 0; |
| 2227 | } |
| 2228 | EXPORT_SYMBOL_GPL(sk_set_peek_off); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | /* |
| 2231 | * Set of default routines for initialising struct proto_ops when |
| 2232 | * the protocol does not support a particular function. In certain |
| 2233 | * cases where it makes no sense for a protocol to have a "do nothing" |
| 2234 | * function, some default processing is provided. |
| 2235 | */ |
| 2236 | |
| 2237 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) |
| 2238 | { |
| 2239 | return -EOPNOTSUPP; |
| 2240 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2241 | EXPORT_SYMBOL(sock_no_bind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2243 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | int len, int flags) |
| 2245 | { |
| 2246 | return -EOPNOTSUPP; |
| 2247 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2248 | EXPORT_SYMBOL(sock_no_connect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | |
| 2250 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) |
| 2251 | { |
| 2252 | return -EOPNOTSUPP; |
| 2253 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2254 | EXPORT_SYMBOL(sock_no_socketpair); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | |
| 2256 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) |
| 2257 | { |
| 2258 | return -EOPNOTSUPP; |
| 2259 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2260 | EXPORT_SYMBOL(sock_no_accept); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2262 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | int *len, int peer) |
| 2264 | { |
| 2265 | return -EOPNOTSUPP; |
| 2266 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2267 | EXPORT_SYMBOL(sock_no_getname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2268 | |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2269 | 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] | 2270 | { |
| 2271 | return 0; |
| 2272 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2273 | EXPORT_SYMBOL(sock_no_poll); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2274 | |
| 2275 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 2276 | { |
| 2277 | return -EOPNOTSUPP; |
| 2278 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2279 | EXPORT_SYMBOL(sock_no_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2280 | |
| 2281 | int sock_no_listen(struct socket *sock, int backlog) |
| 2282 | { |
| 2283 | return -EOPNOTSUPP; |
| 2284 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2285 | EXPORT_SYMBOL(sock_no_listen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | |
| 2287 | int sock_no_shutdown(struct socket *sock, int how) |
| 2288 | { |
| 2289 | return -EOPNOTSUPP; |
| 2290 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2291 | EXPORT_SYMBOL(sock_no_shutdown); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | |
| 2293 | int sock_no_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2294 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | { |
| 2296 | return -EOPNOTSUPP; |
| 2297 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2298 | EXPORT_SYMBOL(sock_no_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | |
| 2300 | int sock_no_getsockopt(struct socket *sock, int level, int optname, |
| 2301 | char __user *optval, int __user *optlen) |
| 2302 | { |
| 2303 | return -EOPNOTSUPP; |
| 2304 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2305 | EXPORT_SYMBOL(sock_no_getsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2307 | 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] | 2308 | { |
| 2309 | return -EOPNOTSUPP; |
| 2310 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2311 | EXPORT_SYMBOL(sock_no_sendmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2313 | int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
| 2314 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2315 | { |
| 2316 | return -EOPNOTSUPP; |
| 2317 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2318 | EXPORT_SYMBOL(sock_no_recvmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | |
| 2320 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) |
| 2321 | { |
| 2322 | /* Mirror missing mmap method error code */ |
| 2323 | return -ENODEV; |
| 2324 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2325 | EXPORT_SYMBOL(sock_no_mmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2326 | |
| 2327 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) |
| 2328 | { |
| 2329 | ssize_t res; |
| 2330 | struct msghdr msg = {.msg_flags = flags}; |
| 2331 | struct kvec iov; |
| 2332 | char *kaddr = kmap(page); |
| 2333 | iov.iov_base = kaddr + offset; |
| 2334 | iov.iov_len = size; |
| 2335 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); |
| 2336 | kunmap(page); |
| 2337 | return res; |
| 2338 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2339 | EXPORT_SYMBOL(sock_no_sendpage); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | |
| 2341 | /* |
| 2342 | * Default Socket Callbacks |
| 2343 | */ |
| 2344 | |
| 2345 | static void sock_def_wakeup(struct sock *sk) |
| 2346 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2347 | struct socket_wq *wq; |
| 2348 | |
| 2349 | rcu_read_lock(); |
| 2350 | wq = rcu_dereference(sk->sk_wq); |
Herbert Xu | 1ce0bf5 | 2015-11-26 13:55:39 +0800 | [diff] [blame] | 2351 | if (skwq_has_sleeper(wq)) |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2352 | wake_up_interruptible_all(&wq->wait); |
| 2353 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | } |
| 2355 | |
| 2356 | static void sock_def_error_report(struct sock *sk) |
| 2357 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2358 | struct socket_wq *wq; |
| 2359 | |
| 2360 | rcu_read_lock(); |
| 2361 | wq = rcu_dereference(sk->sk_wq); |
Herbert Xu | 1ce0bf5 | 2015-11-26 13:55:39 +0800 | [diff] [blame] | 2362 | if (skwq_has_sleeper(wq)) |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2363 | wake_up_interruptible_poll(&wq->wait, POLLERR); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2364 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2365 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2366 | } |
| 2367 | |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 2368 | static void sock_def_readable(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2370 | struct socket_wq *wq; |
| 2371 | |
| 2372 | rcu_read_lock(); |
| 2373 | wq = rcu_dereference(sk->sk_wq); |
Herbert Xu | 1ce0bf5 | 2015-11-26 13:55:39 +0800 | [diff] [blame] | 2374 | if (skwq_has_sleeper(wq)) |
Eric Dumazet | 2c6607c | 2011-01-06 10:54:29 -0800 | [diff] [blame] | 2375 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
Davide Libenzi | 37e5540 | 2009-03-31 15:24:21 -0700 | [diff] [blame] | 2376 | POLLRDNORM | POLLRDBAND); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2377 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2378 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | } |
| 2380 | |
| 2381 | static void sock_def_write_space(struct sock *sk) |
| 2382 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2383 | struct socket_wq *wq; |
| 2384 | |
| 2385 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2386 | |
| 2387 | /* Do not wake up a writer until he can make "significant" |
| 2388 | * progress. --DaveM |
| 2389 | */ |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 2390 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2391 | wq = rcu_dereference(sk->sk_wq); |
Herbert Xu | 1ce0bf5 | 2015-11-26 13:55:39 +0800 | [diff] [blame] | 2392 | if (skwq_has_sleeper(wq)) |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2393 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
Davide Libenzi | 37e5540 | 2009-03-31 15:24:21 -0700 | [diff] [blame] | 2394 | POLLWRNORM | POLLWRBAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2395 | |
| 2396 | /* Should agree with poll, otherwise some programs break */ |
| 2397 | if (sock_writeable(sk)) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2398 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2399 | } |
| 2400 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2401 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2402 | } |
| 2403 | |
| 2404 | static void sock_def_destruct(struct sock *sk) |
| 2405 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | } |
| 2407 | |
| 2408 | void sk_send_sigurg(struct sock *sk) |
| 2409 | { |
| 2410 | if (sk->sk_socket && sk->sk_socket->file) |
| 2411 | if (send_sigurg(&sk->sk_socket->file->f_owner)) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 2412 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2414 | EXPORT_SYMBOL(sk_send_sigurg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | |
| 2416 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, |
| 2417 | unsigned long expires) |
| 2418 | { |
| 2419 | if (!mod_timer(timer, expires)) |
| 2420 | sock_hold(sk); |
| 2421 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2422 | EXPORT_SYMBOL(sk_reset_timer); |
| 2423 | |
| 2424 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) |
| 2425 | { |
Ying Xue | 25cc4ae | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 2426 | if (del_timer(timer)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2427 | __sock_put(sk); |
| 2428 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | EXPORT_SYMBOL(sk_stop_timer); |
| 2430 | |
| 2431 | void sock_init_data(struct socket *sock, struct sock *sk) |
| 2432 | { |
| 2433 | skb_queue_head_init(&sk->sk_receive_queue); |
| 2434 | skb_queue_head_init(&sk->sk_write_queue); |
| 2435 | skb_queue_head_init(&sk->sk_error_queue); |
| 2436 | |
| 2437 | sk->sk_send_head = NULL; |
| 2438 | |
| 2439 | init_timer(&sk->sk_timer); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2441 | sk->sk_allocation = GFP_KERNEL; |
| 2442 | sk->sk_rcvbuf = sysctl_rmem_default; |
| 2443 | sk->sk_sndbuf = sysctl_wmem_default; |
| 2444 | sk->sk_state = TCP_CLOSE; |
David S. Miller | 972692e | 2008-06-17 22:41:38 -0700 | [diff] [blame] | 2445 | sk_set_socket(sk, sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | |
| 2447 | sock_set_flag(sk, SOCK_ZAPPED); |
| 2448 | |
Stephen Hemminger | e71a478 | 2007-04-10 20:10:33 -0700 | [diff] [blame] | 2449 | if (sock) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | sk->sk_type = sock->type; |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2451 | sk->sk_wq = sock->wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2452 | sock->sk = sk; |
Lorenzo Colitti | 81a1591 | 2016-11-04 02:23:41 +0900 | [diff] [blame] | 2453 | sk->sk_uid = SOCK_INODE(sock)->i_uid; |
| 2454 | } else { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 2455 | sk->sk_wq = NULL; |
Lorenzo Colitti | 81a1591 | 2016-11-04 02:23:41 +0900 | [diff] [blame] | 2456 | sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); |
| 2457 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | rwlock_init(&sk->sk_callback_lock); |
Peter Zijlstra | 443aef0 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 2460 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
| 2461 | af_callback_keys + sk->sk_family, |
| 2462 | af_family_clock_key_strings[sk->sk_family]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2463 | |
| 2464 | sk->sk_state_change = sock_def_wakeup; |
| 2465 | sk->sk_data_ready = sock_def_readable; |
| 2466 | sk->sk_write_space = sock_def_write_space; |
| 2467 | sk->sk_error_report = sock_def_error_report; |
| 2468 | sk->sk_destruct = sock_def_destruct; |
| 2469 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2470 | sk->sk_frag.page = NULL; |
| 2471 | sk->sk_frag.offset = 0; |
Pavel Emelyanov | ef64a54 | 2012-02-21 07:31:34 +0000 | [diff] [blame] | 2472 | sk->sk_peek_off = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2473 | |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 2474 | sk->sk_peer_pid = NULL; |
| 2475 | sk->sk_peer_cred = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | sk->sk_write_pending = 0; |
| 2477 | sk->sk_rcvlowat = 1; |
| 2478 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| 2479 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
| 2480 | |
Eric Dumazet | f37f0af | 2008-04-13 21:39:26 -0700 | [diff] [blame] | 2481 | sk->sk_stamp = ktime_set(-1L, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | |
Cong Wang | e0d1095 | 2013-08-01 11:10:25 +0800 | [diff] [blame] | 2483 | #ifdef CONFIG_NET_RX_BUSY_POLL |
Eliezer Tamir | 0602129 | 2013-06-10 11:39:50 +0300 | [diff] [blame] | 2484 | sk->sk_napi_id = 0; |
Eliezer Tamir | 64b0dc5 | 2013-07-10 17:13:36 +0300 | [diff] [blame] | 2485 | sk->sk_ll_usec = sysctl_net_busy_read; |
Eliezer Tamir | 0602129 | 2013-06-10 11:39:50 +0300 | [diff] [blame] | 2486 | #endif |
| 2487 | |
Eric Dumazet | 62748f3 | 2013-09-24 08:20:52 -0700 | [diff] [blame] | 2488 | sk->sk_max_pacing_rate = ~0U; |
Eric Dumazet | 7eec417 | 2013-10-08 15:16:00 -0700 | [diff] [blame] | 2489 | sk->sk_pacing_rate = ~0U; |
Eric Dumazet | 70da268 | 2015-10-08 19:33:21 -0700 | [diff] [blame] | 2490 | sk->sk_incoming_cpu = -1; |
Eric Dumazet | 4dc6dc7 | 2009-07-15 23:13:10 +0000 | [diff] [blame] | 2491 | /* |
| 2492 | * Before updating sk_refcnt, we must commit prior changes to memory |
| 2493 | * (Documentation/RCU/rculist_nulls.txt for details) |
| 2494 | */ |
| 2495 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | atomic_set(&sk->sk_refcnt, 1); |
Wang Chen | 33c732c | 2007-11-13 20:30:01 -0800 | [diff] [blame] | 2497 | atomic_set(&sk->sk_drops, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2498 | } |
Eric Dumazet | 2a91525 | 2009-05-27 11:30:05 +0000 | [diff] [blame] | 2499 | EXPORT_SYMBOL(sock_init_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2500 | |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 2501 | void lock_sock_nested(struct sock *sk, int subclass) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2502 | { |
| 2503 | might_sleep(); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2504 | spin_lock_bh(&sk->sk_lock.slock); |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 2505 | if (sk->sk_lock.owned) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2506 | __lock_sock(sk); |
John Heffner | d2e9117 | 2007-09-12 10:44:19 +0200 | [diff] [blame] | 2507 | sk->sk_lock.owned = 1; |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2508 | spin_unlock(&sk->sk_lock.slock); |
| 2509 | /* |
| 2510 | * The sk_lock has mutex_lock() semantics here: |
| 2511 | */ |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 2512 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2513 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2514 | } |
Peter Zijlstra | fcc70d5 | 2006-11-08 22:44:35 -0800 | [diff] [blame] | 2515 | EXPORT_SYMBOL(lock_sock_nested); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2516 | |
Harvey Harrison | b5606c2 | 2008-02-13 15:03:16 -0800 | [diff] [blame] | 2517 | void release_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2518 | { |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2519 | spin_lock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2520 | if (sk->sk_backlog.tail) |
| 2521 | __release_sock(sk); |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 2522 | |
Eric Dumazet | c3f9b01 | 2014-03-10 09:50:11 -0700 | [diff] [blame] | 2523 | /* Warning : release_cb() might need to release sk ownership, |
| 2524 | * ie call sock_release_ownership(sk) before us. |
| 2525 | */ |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 2526 | if (sk->sk_prot->release_cb) |
| 2527 | sk->sk_prot->release_cb(sk); |
| 2528 | |
Eric Dumazet | c3f9b01 | 2014-03-10 09:50:11 -0700 | [diff] [blame] | 2529 | sock_release_ownership(sk); |
Ingo Molnar | a5b5bb9 | 2006-07-03 00:25:35 -0700 | [diff] [blame] | 2530 | if (waitqueue_active(&sk->sk_lock.wq)) |
| 2531 | wake_up(&sk->sk_lock.wq); |
| 2532 | spin_unlock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2533 | } |
| 2534 | EXPORT_SYMBOL(release_sock); |
| 2535 | |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 2536 | /** |
| 2537 | * lock_sock_fast - fast version of lock_sock |
| 2538 | * @sk: socket |
| 2539 | * |
| 2540 | * This version should be used for very small section, where process wont block |
| 2541 | * return false if fast path is taken |
| 2542 | * sk_lock.slock locked, owned = 0, BH disabled |
| 2543 | * return true if slow path is taken |
| 2544 | * sk_lock.slock unlocked, owned = 1, BH enabled |
| 2545 | */ |
| 2546 | bool lock_sock_fast(struct sock *sk) |
| 2547 | { |
| 2548 | might_sleep(); |
| 2549 | spin_lock_bh(&sk->sk_lock.slock); |
| 2550 | |
| 2551 | if (!sk->sk_lock.owned) |
| 2552 | /* |
| 2553 | * Note : We must disable BH |
| 2554 | */ |
| 2555 | return false; |
| 2556 | |
| 2557 | __lock_sock(sk); |
| 2558 | sk->sk_lock.owned = 1; |
| 2559 | spin_unlock(&sk->sk_lock.slock); |
| 2560 | /* |
| 2561 | * The sk_lock has mutex_lock() semantics here: |
| 2562 | */ |
| 2563 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); |
| 2564 | local_bh_enable(); |
| 2565 | return true; |
| 2566 | } |
| 2567 | EXPORT_SYMBOL(lock_sock_fast); |
| 2568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2569 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2570 | { |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2571 | struct timeval tv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2572 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2573 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2574 | tv = ktime_to_timeval(sk->sk_stamp); |
| 2575 | if (tv.tv_sec == -1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2576 | return -ENOENT; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 2577 | if (tv.tv_sec == 0) { |
| 2578 | sk->sk_stamp = ktime_get_real(); |
| 2579 | tv = ktime_to_timeval(sk->sk_stamp); |
| 2580 | } |
| 2581 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2582 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2583 | EXPORT_SYMBOL(sock_get_timestamp); |
| 2584 | |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 2585 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
| 2586 | { |
| 2587 | struct timespec ts; |
| 2588 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2589 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
Eric Dumazet | ae40eb1 | 2007-03-18 17:33:16 -0700 | [diff] [blame] | 2590 | ts = ktime_to_timespec(sk->sk_stamp); |
| 2591 | if (ts.tv_sec == -1) |
| 2592 | return -ENOENT; |
| 2593 | if (ts.tv_sec == 0) { |
| 2594 | sk->sk_stamp = ktime_get_real(); |
| 2595 | ts = ktime_to_timespec(sk->sk_stamp); |
| 2596 | } |
| 2597 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; |
| 2598 | } |
| 2599 | EXPORT_SYMBOL(sock_get_timestampns); |
| 2600 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2601 | void sock_enable_timestamp(struct sock *sk, int flag) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2602 | { |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2603 | if (!sock_flag(sk, flag)) { |
Eric Dumazet | 08e29af | 2011-11-28 12:04:18 +0000 | [diff] [blame] | 2604 | unsigned long previous_flags = sk->sk_flags; |
| 2605 | |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2606 | sock_set_flag(sk, flag); |
| 2607 | /* |
| 2608 | * we just set one of the two flags which require net |
| 2609 | * time stamping, but time stamping might have been on |
| 2610 | * already because of the other one |
| 2611 | */ |
Hannes Frederic Sowa | 080a270 | 2015-10-26 13:51:37 +0100 | [diff] [blame] | 2612 | if (sock_needs_netstamp(sk) && |
| 2613 | !(previous_flags & SK_FLAGS_TIMESTAMP)) |
Patrick Ohly | 20d4947 | 2009-02-12 05:03:38 +0000 | [diff] [blame] | 2614 | net_enable_timestamp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | } |
| 2616 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2617 | |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2618 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
| 2619 | int level, int type) |
| 2620 | { |
| 2621 | struct sock_exterr_skb *serr; |
Willem de Bruijn | 364a9e9 | 2014-08-31 21:30:27 -0400 | [diff] [blame] | 2622 | struct sk_buff *skb; |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2623 | int copied, err; |
| 2624 | |
| 2625 | err = -EAGAIN; |
Willem de Bruijn | 364a9e9 | 2014-08-31 21:30:27 -0400 | [diff] [blame] | 2626 | skb = sock_dequeue_err_skb(sk); |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2627 | if (skb == NULL) |
| 2628 | goto out; |
| 2629 | |
| 2630 | copied = skb->len; |
| 2631 | if (copied > len) { |
| 2632 | msg->msg_flags |= MSG_TRUNC; |
| 2633 | copied = len; |
| 2634 | } |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 2635 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2636 | if (err) |
| 2637 | goto out_free_skb; |
| 2638 | |
| 2639 | sock_recv_timestamp(msg, sk, skb); |
| 2640 | |
| 2641 | serr = SKB_EXT_ERR(skb); |
| 2642 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); |
| 2643 | |
| 2644 | msg->msg_flags |= MSG_ERRQUEUE; |
| 2645 | err = copied; |
| 2646 | |
Richard Cochran | cb820f8 | 2013-07-19 19:40:09 +0200 | [diff] [blame] | 2647 | out_free_skb: |
| 2648 | kfree_skb(skb); |
| 2649 | out: |
| 2650 | return err; |
| 2651 | } |
| 2652 | EXPORT_SYMBOL(sock_recv_errqueue); |
| 2653 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2654 | /* |
| 2655 | * Get a socket option on an socket. |
| 2656 | * |
| 2657 | * FIX: POSIX 1003.1g is very ambiguous here. It states that |
| 2658 | * asynchronous errors should be reported by getsockopt. We assume |
| 2659 | * this means if you specify SO_ERROR (otherwise whats the point of it). |
| 2660 | */ |
| 2661 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 2662 | char __user *optval, int __user *optlen) |
| 2663 | { |
| 2664 | struct sock *sk = sock->sk; |
| 2665 | |
| 2666 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 2667 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2668 | EXPORT_SYMBOL(sock_common_getsockopt); |
| 2669 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2670 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2671 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 2672 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2673 | { |
| 2674 | struct sock *sk = sock->sk; |
| 2675 | |
Johannes Berg | 1e51f95 | 2007-03-06 13:44:06 -0800 | [diff] [blame] | 2676 | if (sk->sk_prot->compat_getsockopt != NULL) |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2677 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
| 2678 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2679 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 2680 | } |
| 2681 | EXPORT_SYMBOL(compat_sock_common_getsockopt); |
| 2682 | #endif |
| 2683 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2684 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
| 2685 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2686 | { |
| 2687 | struct sock *sk = sock->sk; |
| 2688 | int addr_len = 0; |
| 2689 | int err; |
| 2690 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2691 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2692 | flags & ~MSG_DONTWAIT, &addr_len); |
| 2693 | if (err >= 0) |
| 2694 | msg->msg_namelen = addr_len; |
| 2695 | return err; |
| 2696 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2697 | EXPORT_SYMBOL(sock_common_recvmsg); |
| 2698 | |
| 2699 | /* |
| 2700 | * Set socket options on an inet socket. |
| 2701 | */ |
| 2702 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2703 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2704 | { |
| 2705 | struct sock *sk = sock->sk; |
| 2706 | |
| 2707 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 2708 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2709 | EXPORT_SYMBOL(sock_common_setsockopt); |
| 2710 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2711 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2712 | 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] | 2713 | char __user *optval, unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2714 | { |
| 2715 | struct sock *sk = sock->sk; |
| 2716 | |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2717 | if (sk->sk_prot->compat_setsockopt != NULL) |
| 2718 | return sk->sk_prot->compat_setsockopt(sk, level, optname, |
| 2719 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2720 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 2721 | } |
| 2722 | EXPORT_SYMBOL(compat_sock_common_setsockopt); |
| 2723 | #endif |
| 2724 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2725 | void sk_common_release(struct sock *sk) |
| 2726 | { |
| 2727 | if (sk->sk_prot->destroy) |
| 2728 | sk->sk_prot->destroy(sk); |
| 2729 | |
| 2730 | /* |
| 2731 | * Observation: when sock_common_release is called, processes have |
| 2732 | * no access to socket. But net still has. |
| 2733 | * Step one, detach it from networking: |
| 2734 | * |
| 2735 | * A. Remove from hash tables. |
| 2736 | */ |
| 2737 | |
| 2738 | sk->sk_prot->unhash(sk); |
| 2739 | |
| 2740 | /* |
| 2741 | * In this point socket cannot receive new packets, but it is possible |
| 2742 | * that some packets are in flight because some CPU runs receiver and |
| 2743 | * did hash table lookup before we unhashed socket. They will achieve |
| 2744 | * receive queue and will be purged by socket destructor. |
| 2745 | * |
| 2746 | * Also we still have packets pending on receive queue and probably, |
| 2747 | * our own packets waiting in device queues. sock_destroy will drain |
| 2748 | * receive queue, but transmitted packets will delay socket destruction |
| 2749 | * until the last reference will be released. |
| 2750 | */ |
| 2751 | |
| 2752 | sock_orphan(sk); |
| 2753 | |
| 2754 | xfrm_sk_free_policy(sk); |
| 2755 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 2756 | sk_refcnt_debug_release(sk); |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 2757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2758 | sock_put(sk); |
| 2759 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2760 | EXPORT_SYMBOL(sk_common_release); |
| 2761 | |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2762 | #ifdef CONFIG_PROC_FS |
| 2763 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2764 | struct prot_inuse { |
| 2765 | int val[PROTO_INUSE_NR]; |
| 2766 | }; |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2767 | |
| 2768 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2769 | |
| 2770 | #ifdef CONFIG_NET_NS |
| 2771 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
| 2772 | { |
Eric Dumazet | d6d9ca0 | 2010-07-19 10:48:49 +0000 | [diff] [blame] | 2773 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2774 | } |
| 2775 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| 2776 | |
| 2777 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
| 2778 | { |
| 2779 | int cpu, idx = prot->inuse_idx; |
| 2780 | int res = 0; |
| 2781 | |
| 2782 | for_each_possible_cpu(cpu) |
| 2783 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; |
| 2784 | |
| 2785 | return res >= 0 ? res : 0; |
| 2786 | } |
| 2787 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
| 2788 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2789 | static int __net_init sock_inuse_init_net(struct net *net) |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2790 | { |
| 2791 | net->core.inuse = alloc_percpu(struct prot_inuse); |
| 2792 | return net->core.inuse ? 0 : -ENOMEM; |
| 2793 | } |
| 2794 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2795 | static void __net_exit sock_inuse_exit_net(struct net *net) |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2796 | { |
| 2797 | free_percpu(net->core.inuse); |
| 2798 | } |
| 2799 | |
| 2800 | static struct pernet_operations net_inuse_ops = { |
| 2801 | .init = sock_inuse_init_net, |
| 2802 | .exit = sock_inuse_exit_net, |
| 2803 | }; |
| 2804 | |
| 2805 | static __init int net_inuse_init(void) |
| 2806 | { |
| 2807 | if (register_pernet_subsys(&net_inuse_ops)) |
| 2808 | panic("Cannot initialize net inuse counters"); |
| 2809 | |
| 2810 | return 0; |
| 2811 | } |
| 2812 | |
| 2813 | core_initcall(net_inuse_init); |
| 2814 | #else |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2815 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
| 2816 | |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 2817 | 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] | 2818 | { |
Eric Dumazet | d6d9ca0 | 2010-07-19 10:48:49 +0000 | [diff] [blame] | 2819 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2820 | } |
| 2821 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); |
| 2822 | |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 2823 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
Pavel Emelyanov | 1338d46 | 2008-03-28 16:38:43 -0700 | [diff] [blame] | 2824 | { |
| 2825 | int cpu, idx = prot->inuse_idx; |
| 2826 | int res = 0; |
| 2827 | |
| 2828 | for_each_possible_cpu(cpu) |
| 2829 | res += per_cpu(prot_inuse, cpu).val[idx]; |
| 2830 | |
| 2831 | return res >= 0 ? res : 0; |
| 2832 | } |
| 2833 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); |
Pavel Emelyanov | 70ee115 | 2008-03-31 19:42:16 -0700 | [diff] [blame] | 2834 | #endif |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2835 | |
| 2836 | static void assign_proto_idx(struct proto *prot) |
| 2837 | { |
| 2838 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); |
| 2839 | |
| 2840 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 2841 | pr_err("PROTO_INUSE_NR exhausted\n"); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2842 | return; |
| 2843 | } |
| 2844 | |
| 2845 | set_bit(prot->inuse_idx, proto_inuse_idx); |
| 2846 | } |
| 2847 | |
| 2848 | static void release_proto_idx(struct proto *prot) |
| 2849 | { |
| 2850 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) |
| 2851 | clear_bit(prot->inuse_idx, proto_inuse_idx); |
| 2852 | } |
| 2853 | #else |
| 2854 | static inline void assign_proto_idx(struct proto *prot) |
| 2855 | { |
| 2856 | } |
| 2857 | |
| 2858 | static inline void release_proto_idx(struct proto *prot) |
| 2859 | { |
| 2860 | } |
| 2861 | #endif |
| 2862 | |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2863 | static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
| 2864 | { |
| 2865 | if (!rsk_prot) |
| 2866 | return; |
| 2867 | kfree(rsk_prot->slab_name); |
| 2868 | rsk_prot->slab_name = NULL; |
Julia Lawall | adf78ed | 2015-09-13 14:15:18 +0200 | [diff] [blame] | 2869 | kmem_cache_destroy(rsk_prot->slab); |
| 2870 | rsk_prot->slab = NULL; |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2871 | } |
| 2872 | |
| 2873 | static int req_prot_init(const struct proto *prot) |
| 2874 | { |
| 2875 | struct request_sock_ops *rsk_prot = prot->rsk_prot; |
| 2876 | |
| 2877 | if (!rsk_prot) |
| 2878 | return 0; |
| 2879 | |
| 2880 | rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", |
| 2881 | prot->name); |
| 2882 | if (!rsk_prot->slab_name) |
| 2883 | return -ENOMEM; |
| 2884 | |
| 2885 | rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, |
| 2886 | rsk_prot->obj_size, 0, |
Eric Dumazet | e96f78a | 2015-10-03 06:27:28 -0700 | [diff] [blame] | 2887 | prot->slab_flags, NULL); |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2888 | |
| 2889 | if (!rsk_prot->slab) { |
| 2890 | pr_crit("%s: Can't create request sock SLAB cache!\n", |
| 2891 | prot->name); |
| 2892 | return -ENOMEM; |
| 2893 | } |
| 2894 | return 0; |
| 2895 | } |
| 2896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2897 | int proto_register(struct proto *prot, int alloc_slab) |
| 2898 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2899 | if (alloc_slab) { |
| 2900 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 2901 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
| 2902 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2903 | |
| 2904 | if (prot->slab == NULL) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 2905 | pr_crit("%s: Can't create sock SLAB cache!\n", |
| 2906 | prot->name); |
Pavel Emelyanov | 60e7663 | 2008-03-28 16:39:10 -0700 | [diff] [blame] | 2907 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2908 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2909 | |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2910 | if (req_prot_init(prot)) |
| 2911 | goto out_free_request_sock_slab; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2912 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2913 | if (prot->twsk_prot != NULL) { |
Alexey Dobriyan | faf2342 | 2010-02-17 09:34:12 +0000 | [diff] [blame] | 2914 | 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] | 2915 | |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2916 | if (prot->twsk_prot->twsk_slab_name == NULL) |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2917 | goto out_free_request_sock_slab; |
| 2918 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2919 | prot->twsk_prot->twsk_slab = |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2920 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2921 | prot->twsk_prot->twsk_obj_size, |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2922 | 0, |
Eric Dumazet | 52db70d | 2015-04-10 06:07:18 -0700 | [diff] [blame] | 2923 | prot->slab_flags, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2924 | NULL); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2925 | if (prot->twsk_prot->twsk_slab == NULL) |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2926 | goto out_free_timewait_sock_slab_name; |
| 2927 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2928 | } |
| 2929 | |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2930 | mutex_lock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2931 | list_add(&prot->node, &proto_list); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2932 | assign_proto_idx(prot); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2933 | mutex_unlock(&proto_list_mutex); |
Pavel Emelyanov | b733c00 | 2007-11-07 02:23:38 -0800 | [diff] [blame] | 2934 | return 0; |
| 2935 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2936 | out_free_timewait_sock_slab_name: |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2937 | kfree(prot->twsk_prot->twsk_slab_name); |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2938 | out_free_request_sock_slab: |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2939 | req_prot_cleanup(prot->rsk_prot); |
| 2940 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2941 | kmem_cache_destroy(prot->slab); |
| 2942 | prot->slab = NULL; |
Pavel Emelyanov | b733c00 | 2007-11-07 02:23:38 -0800 | [diff] [blame] | 2943 | out: |
| 2944 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2945 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2946 | EXPORT_SYMBOL(proto_register); |
| 2947 | |
| 2948 | void proto_unregister(struct proto *prot) |
| 2949 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2950 | mutex_lock(&proto_list_mutex); |
Pavel Emelyanov | 13ff3d6 | 2008-03-28 16:38:17 -0700 | [diff] [blame] | 2951 | release_proto_idx(prot); |
Patrick McHardy | 0a3f435 | 2005-09-06 19:47:50 -0700 | [diff] [blame] | 2952 | list_del(&prot->node); |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2953 | mutex_unlock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2954 | |
Julia Lawall | adf78ed | 2015-09-13 14:15:18 +0200 | [diff] [blame] | 2955 | kmem_cache_destroy(prot->slab); |
| 2956 | prot->slab = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2957 | |
Eric Dumazet | 0159dfd | 2015-03-12 16:44:07 -0700 | [diff] [blame] | 2958 | req_prot_cleanup(prot->rsk_prot); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2959 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2960 | 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] | 2961 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
Catalin Marinas | 7e56b5d | 2008-11-21 16:45:22 -0800 | [diff] [blame] | 2962 | kfree(prot->twsk_prot->twsk_slab_name); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2963 | prot->twsk_prot->twsk_slab = NULL; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2964 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2965 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2966 | EXPORT_SYMBOL(proto_unregister); |
| 2967 | |
| 2968 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2969 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2970 | __acquires(proto_list_mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2971 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2972 | mutex_lock(&proto_list_mutex); |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2973 | return seq_list_start_head(&proto_list, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2974 | } |
| 2975 | |
| 2976 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2977 | { |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 2978 | return seq_list_next(v, &proto_list, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2979 | } |
| 2980 | |
| 2981 | static void proto_seq_stop(struct seq_file *seq, void *v) |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2982 | __releases(proto_list_mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2983 | { |
Glauber Costa | 36b77a5 | 2011-12-16 00:51:59 +0000 | [diff] [blame] | 2984 | mutex_unlock(&proto_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2985 | } |
| 2986 | |
| 2987 | static char proto_method_implemented(const void *method) |
| 2988 | { |
| 2989 | return method == NULL ? 'n' : 'y'; |
| 2990 | } |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2991 | static long sock_prot_memory_allocated(struct proto *proto) |
| 2992 | { |
Jeffrin Jose | cb75a36 | 2012-04-25 19:17:29 +0530 | [diff] [blame] | 2993 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 2994 | } |
| 2995 | |
| 2996 | static char *sock_prot_memory_pressure(struct proto *proto) |
| 2997 | { |
| 2998 | return proto->memory_pressure != NULL ? |
| 2999 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; |
| 3000 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3001 | |
| 3002 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) |
| 3003 | { |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 3004 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 3005 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3006 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
| 3007 | proto->name, |
| 3008 | proto->obj_size, |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 3009 | sock_prot_inuse_get(seq_file_net(seq), proto), |
Glauber Costa | 180d8cd | 2011-12-11 21:47:02 +0000 | [diff] [blame] | 3010 | sock_prot_memory_allocated(proto), |
| 3011 | sock_prot_memory_pressure(proto), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3012 | proto->max_header, |
| 3013 | proto->slab == NULL ? "no" : "yes", |
| 3014 | module_name(proto->owner), |
| 3015 | proto_method_implemented(proto->close), |
| 3016 | proto_method_implemented(proto->connect), |
| 3017 | proto_method_implemented(proto->disconnect), |
| 3018 | proto_method_implemented(proto->accept), |
| 3019 | proto_method_implemented(proto->ioctl), |
| 3020 | proto_method_implemented(proto->init), |
| 3021 | proto_method_implemented(proto->destroy), |
| 3022 | proto_method_implemented(proto->shutdown), |
| 3023 | proto_method_implemented(proto->setsockopt), |
| 3024 | proto_method_implemented(proto->getsockopt), |
| 3025 | proto_method_implemented(proto->sendmsg), |
| 3026 | proto_method_implemented(proto->recvmsg), |
| 3027 | proto_method_implemented(proto->sendpage), |
| 3028 | proto_method_implemented(proto->bind), |
| 3029 | proto_method_implemented(proto->backlog_rcv), |
| 3030 | proto_method_implemented(proto->hash), |
| 3031 | proto_method_implemented(proto->unhash), |
| 3032 | proto_method_implemented(proto->get_port), |
| 3033 | proto_method_implemented(proto->enter_memory_pressure)); |
| 3034 | } |
| 3035 | |
| 3036 | static int proto_seq_show(struct seq_file *seq, void *v) |
| 3037 | { |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 3038 | if (v == &proto_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3039 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
| 3040 | "protocol", |
| 3041 | "size", |
| 3042 | "sockets", |
| 3043 | "memory", |
| 3044 | "press", |
| 3045 | "maxhdr", |
| 3046 | "slab", |
| 3047 | "module", |
| 3048 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); |
| 3049 | else |
Pavel Emelianov | 60f0438 | 2007-07-09 13:15:14 -0700 | [diff] [blame] | 3050 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3051 | return 0; |
| 3052 | } |
| 3053 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 3054 | static const struct seq_operations proto_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3055 | .start = proto_seq_start, |
| 3056 | .next = proto_seq_next, |
| 3057 | .stop = proto_seq_stop, |
| 3058 | .show = proto_seq_show, |
| 3059 | }; |
| 3060 | |
| 3061 | static int proto_seq_open(struct inode *inode, struct file *file) |
| 3062 | { |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 3063 | return seq_open_net(inode, file, &proto_seq_ops, |
| 3064 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3065 | } |
| 3066 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 3067 | static const struct file_operations proto_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3068 | .owner = THIS_MODULE, |
| 3069 | .open = proto_seq_open, |
| 3070 | .read = seq_read, |
| 3071 | .llseek = seq_lseek, |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 3072 | .release = seq_release_net, |
| 3073 | }; |
| 3074 | |
| 3075 | static __net_init int proto_init_net(struct net *net) |
| 3076 | { |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 3077 | if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 3078 | return -ENOMEM; |
| 3079 | |
| 3080 | return 0; |
| 3081 | } |
| 3082 | |
| 3083 | static __net_exit void proto_exit_net(struct net *net) |
| 3084 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 3085 | remove_proc_entry("protocols", net->proc_net); |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 3086 | } |
| 3087 | |
| 3088 | |
| 3089 | static __net_initdata struct pernet_operations proto_net_ops = { |
| 3090 | .init = proto_init_net, |
| 3091 | .exit = proto_exit_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3092 | }; |
| 3093 | |
| 3094 | static int __init proto_init(void) |
| 3095 | { |
Eric Dumazet | 14e943d | 2008-11-19 15:14:01 -0800 | [diff] [blame] | 3096 | return register_pernet_subsys(&proto_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3097 | } |
| 3098 | |
| 3099 | subsys_initcall(proto_init); |
| 3100 | |
| 3101 | #endif /* PROC_FS */ |