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 | * The User Datagram Protocol (UDP). |
| 7 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 8 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 10 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> |
Alan Cox | 113aa83 | 2008-10-13 19:01:08 -0700 | [diff] [blame] | 11 | * Alan Cox, <alan@lxorguk.ukuu.org.uk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * Hirokazu Takahashi, <taka@valinux.co.jp> |
| 13 | * |
| 14 | * Fixes: |
| 15 | * Alan Cox : verify_area() calls |
| 16 | * Alan Cox : stopped close while in use off icmp |
| 17 | * messages. Not a fix but a botch that |
| 18 | * for udp at least is 'valid'. |
| 19 | * Alan Cox : Fixed icmp handling properly |
| 20 | * Alan Cox : Correct error for oversized datagrams |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 21 | * Alan Cox : Tidied select() semantics. |
| 22 | * Alan Cox : udp_err() fixed properly, also now |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | * select and read wake correctly on errors |
| 24 | * Alan Cox : udp_send verify_area moved to avoid mem leak |
| 25 | * Alan Cox : UDP can count its memory |
| 26 | * Alan Cox : send to an unknown connection causes |
| 27 | * an ECONNREFUSED off the icmp, but |
| 28 | * does NOT close. |
| 29 | * Alan Cox : Switched to new sk_buff handlers. No more backlog! |
| 30 | * Alan Cox : Using generic datagram code. Even smaller and the PEEK |
| 31 | * bug no longer crashes it. |
| 32 | * Fred Van Kempen : Net2e support for sk->broadcast. |
| 33 | * Alan Cox : Uses skb_free_datagram |
| 34 | * Alan Cox : Added get/set sockopt support. |
| 35 | * Alan Cox : Broadcasting without option set returns EACCES. |
| 36 | * Alan Cox : No wakeup calls. Instead we now use the callbacks. |
| 37 | * Alan Cox : Use ip_tos and ip_ttl |
| 38 | * Alan Cox : SNMP Mibs |
| 39 | * Alan Cox : MSG_DONTROUTE, and 0.0.0.0 support. |
| 40 | * Matt Dillon : UDP length checks. |
| 41 | * Alan Cox : Smarter af_inet used properly. |
| 42 | * Alan Cox : Use new kernel side addressing. |
| 43 | * Alan Cox : Incorrect return on truncated datagram receive. |
| 44 | * Arnt Gulbrandsen : New udp_send and stuff |
| 45 | * Alan Cox : Cache last socket |
| 46 | * Alan Cox : Route cache |
| 47 | * Jon Peatfield : Minor efficiency fix to sendto(). |
| 48 | * Mike Shaver : RFC1122 checks. |
| 49 | * Alan Cox : Nonblocking error fix. |
| 50 | * Willy Konynenberg : Transparent proxying support. |
| 51 | * Mike McLagan : Routing by source |
| 52 | * David S. Miller : New socket lookup architecture. |
| 53 | * Last socket cache retained as it |
| 54 | * does have a high hit rate. |
| 55 | * Olaf Kirch : Don't linearise iovec on sendmsg. |
| 56 | * Andi Kleen : Some cleanups, cache destination entry |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 57 | * for connect. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. |
| 59 | * Melvin Smith : Check msg_name not msg_namelen in sendto(), |
| 60 | * return ENOTCONN for unconnected sockets (POSIX) |
| 61 | * Janos Farkas : don't deliver multi/broadcasts to a different |
| 62 | * bound-to-device socket |
| 63 | * Hirokazu Takahashi : HW checksumming for outgoing UDP |
| 64 | * datagrams. |
| 65 | * Hirokazu Takahashi : sendfile() on UDP works now. |
| 66 | * Arnaldo C. Melo : convert /proc/net/udp to seq_file |
| 67 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| 68 | * Alexey Kuznetsov: allow both IPv4 and IPv6 sockets to bind |
| 69 | * a single port at the same time. |
| 70 | * Derek Atkins <derek@ihtfp.com>: Add Encapulation Support |
James Chapman | 342f023 | 2007-06-27 15:37:46 -0700 | [diff] [blame] | 71 | * James Chapman : Add L2TP encapsulation type. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | * |
| 73 | * |
| 74 | * This program is free software; you can redistribute it and/or |
| 75 | * modify it under the terms of the GNU General Public License |
| 76 | * as published by the Free Software Foundation; either version |
| 77 | * 2 of the License, or (at your option) any later version. |
| 78 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 79 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 80 | #define pr_fmt(fmt) "UDP: " fmt |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | #include <asm/uaccess.h> |
| 83 | #include <asm/ioctls.h> |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 84 | #include <linux/bootmem.h> |
Eric Dumazet | 8203efb | 2008-10-29 02:32:32 -0700 | [diff] [blame] | 85 | #include <linux/highmem.h> |
| 86 | #include <linux/swap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | #include <linux/types.h> |
| 88 | #include <linux/fcntl.h> |
| 89 | #include <linux/module.h> |
| 90 | #include <linux/socket.h> |
| 91 | #include <linux/sockios.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 92 | #include <linux/igmp.h> |
Shawn Bohrer | 6e54030 | 2015-06-03 16:27:38 -0500 | [diff] [blame] | 93 | #include <linux/inetdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | #include <linux/in.h> |
| 95 | #include <linux/errno.h> |
| 96 | #include <linux/timer.h> |
| 97 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | #include <linux/inet.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | #include <linux/netdevice.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 100 | #include <linux/slab.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 101 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | #include <linux/skbuff.h> |
| 103 | #include <linux/proc_fs.h> |
| 104 | #include <linux/seq_file.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 105 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | #include <net/icmp.h> |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 107 | #include <net/inet_hashtables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #include <net/route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | #include <net/checksum.h> |
| 110 | #include <net/xfrm.h> |
Satoru Moriya | 296f7ea | 2011-06-17 11:58:39 +0000 | [diff] [blame] | 111 | #include <trace/events/udp.h> |
Eric Dumazet | 447167b | 2012-04-11 23:05:28 +0000 | [diff] [blame] | 112 | #include <linux/static_key.h> |
Eric Dumazet | 22911fc | 2012-06-27 00:23:44 +0000 | [diff] [blame] | 113 | #include <trace/events/skb.h> |
Eliezer Tamir | 076bb0c | 2013-07-10 17:13:17 +0300 | [diff] [blame] | 114 | #include <net/busy_poll.h> |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 115 | #include "udp_impl.h" |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 116 | #include <net/sock_reuseport.h> |
Eric Dumazet | 217375a | 2016-08-18 09:59:12 -0700 | [diff] [blame] | 117 | #include <net/addrconf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 119 | struct udp_table udp_table __read_mostly; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 120 | EXPORT_SYMBOL(udp_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 122 | long sysctl_udp_mem[3] __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 123 | EXPORT_SYMBOL(sysctl_udp_mem); |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 124 | |
| 125 | int sysctl_udp_rmem_min __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 126 | EXPORT_SYMBOL(sysctl_udp_rmem_min); |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 127 | |
| 128 | int sysctl_udp_wmem_min __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 129 | EXPORT_SYMBOL(sysctl_udp_wmem_min); |
| 130 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 131 | atomic_long_t udp_memory_allocated; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 132 | EXPORT_SYMBOL(udp_memory_allocated); |
| 133 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 134 | #define MAX_UDP_PORTS 65536 |
| 135 | #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN) |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 136 | |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 137 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 138 | const struct udp_hslot *hslot, |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 139 | unsigned long *bitmap, |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 140 | struct sock *sk, |
| 141 | int (*saddr_comp)(const struct sock *sk1, |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 142 | const struct sock *sk2, |
| 143 | bool match_wildcard), |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 144 | unsigned int log) |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 145 | { |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 146 | struct sock *sk2; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 147 | kuid_t uid = sock_i_uid(sk); |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 148 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 149 | sk_for_each(sk2, &hslot->head) { |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 150 | if (net_eq(sock_net(sk2), net) && |
| 151 | sk2 != sk && |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 152 | (bitmap || udp_sk(sk2)->udp_port_hash == num) && |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 153 | (!sk2->sk_reuse || !sk->sk_reuse) && |
| 154 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || |
| 155 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 156 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 157 | rcu_access_pointer(sk->sk_reuseport_cb) || |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 158 | !uid_eq(uid, sock_i_uid(sk2))) && |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 159 | saddr_comp(sk, sk2, true)) { |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 160 | if (!bitmap) |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 161 | return 1; |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 162 | __set_bit(udp_sk(sk2)->udp_port_hash >> log, bitmap); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 163 | } |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 164 | } |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 165 | return 0; |
| 166 | } |
| 167 | |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 168 | /* |
| 169 | * Note: we still hold spinlock of primary hash chain, so no other writer |
| 170 | * can insert/delete a socket with local_port == num |
| 171 | */ |
| 172 | static int udp_lib_lport_inuse2(struct net *net, __u16 num, |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 173 | struct udp_hslot *hslot2, |
| 174 | struct sock *sk, |
| 175 | int (*saddr_comp)(const struct sock *sk1, |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 176 | const struct sock *sk2, |
| 177 | bool match_wildcard)) |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 178 | { |
| 179 | struct sock *sk2; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 180 | kuid_t uid = sock_i_uid(sk); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 181 | int res = 0; |
| 182 | |
| 183 | spin_lock(&hslot2->lock); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 184 | udp_portaddr_for_each_entry(sk2, &hslot2->head) { |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 185 | if (net_eq(sock_net(sk2), net) && |
| 186 | sk2 != sk && |
| 187 | (udp_sk(sk2)->udp_port_hash == num) && |
| 188 | (!sk2->sk_reuse || !sk->sk_reuse) && |
| 189 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || |
| 190 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 191 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 192 | rcu_access_pointer(sk->sk_reuseport_cb) || |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 193 | !uid_eq(uid, sock_i_uid(sk2))) && |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 194 | saddr_comp(sk, sk2, true)) { |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 195 | res = 1; |
| 196 | break; |
| 197 | } |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 198 | } |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 199 | spin_unlock(&hslot2->lock); |
| 200 | return res; |
| 201 | } |
| 202 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 203 | static int udp_reuseport_add_sock(struct sock *sk, struct udp_hslot *hslot, |
| 204 | int (*saddr_same)(const struct sock *sk1, |
| 205 | const struct sock *sk2, |
| 206 | bool match_wildcard)) |
| 207 | { |
| 208 | struct net *net = sock_net(sk); |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 209 | kuid_t uid = sock_i_uid(sk); |
| 210 | struct sock *sk2; |
| 211 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 212 | sk_for_each(sk2, &hslot->head) { |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 213 | if (net_eq(sock_net(sk2), net) && |
| 214 | sk2 != sk && |
| 215 | sk2->sk_family == sk->sk_family && |
| 216 | ipv6_only_sock(sk2) == ipv6_only_sock(sk) && |
| 217 | (udp_sk(sk2)->udp_port_hash == udp_sk(sk)->udp_port_hash) && |
| 218 | (sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && |
| 219 | sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) && |
| 220 | (*saddr_same)(sk, sk2, false)) { |
| 221 | return reuseport_add_sock(sk, sk2); |
| 222 | } |
| 223 | } |
| 224 | |
Craig Gallek | 3b0b4d2 | 2017-10-19 15:00:29 -0400 | [diff] [blame] | 225 | return reuseport_alloc(sk); |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 226 | } |
| 227 | |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 228 | /** |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 229 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 230 | * |
| 231 | * @sk: socket struct in question |
| 232 | * @snum: port number to look up |
David S. Miller | df2bc45 | 2007-06-05 15:18:43 -0700 | [diff] [blame] | 233 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 234 | * @hash2_nulladdr: AF-dependent hash value in secondary hash chains, |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 235 | * with NULL address |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 236 | */ |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 237 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 238 | int (*saddr_comp)(const struct sock *sk1, |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 239 | const struct sock *sk2, |
| 240 | bool match_wildcard), |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 241 | unsigned int hash2_nulladdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | { |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 243 | struct udp_hslot *hslot, *hslot2; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 244 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 245 | int error = 1; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 246 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Stephen Hemminger | 32c1da7 | 2007-08-24 23:09:41 -0700 | [diff] [blame] | 248 | if (!snum) { |
Eric Dumazet | 9088c56 | 2008-10-08 11:44:17 -0700 | [diff] [blame] | 249 | int low, high, remaining; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 250 | unsigned int rand; |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 251 | unsigned short first, last; |
| 252 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
Eric W. Biederman | 0bbf87d | 2013-09-28 14:10:59 -0700 | [diff] [blame] | 254 | inet_get_local_port_range(net, &low, &high); |
Anton Arapov | a25de53 | 2007-10-18 22:00:17 -0700 | [diff] [blame] | 255 | remaining = (high - low) + 1; |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 256 | |
Aruna-Hewapathirane | 63862b5 | 2014-01-11 07:15:59 -0500 | [diff] [blame] | 257 | rand = prandom_u32(); |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 258 | first = reciprocal_scale(rand, remaining) + low; |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 259 | /* |
| 260 | * force rand to be an odd multiple of UDP_HTABLE_SIZE |
| 261 | */ |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 262 | rand = (rand | 1) * (udptable->mask + 1); |
Eric Dumazet | 5781b23 | 2009-12-13 19:32:39 -0800 | [diff] [blame] | 263 | last = first + udptable->mask + 1; |
| 264 | do { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 265 | hslot = udp_hashslot(udptable, net, first); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 266 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 267 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 268 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 269 | saddr_comp, udptable->log); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 270 | |
| 271 | snum = first; |
| 272 | /* |
| 273 | * Iterate on all possible values of snum for this hash. |
| 274 | * Using steps of an odd multiple of UDP_HTABLE_SIZE |
| 275 | * give us randomization and full range coverage. |
| 276 | */ |
Eric Dumazet | 9088c56 | 2008-10-08 11:44:17 -0700 | [diff] [blame] | 277 | do { |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 278 | if (low <= snum && snum <= high && |
Amerigo Wang | e3826f1 | 2010-05-05 00:27:06 +0000 | [diff] [blame] | 279 | !test_bit(snum >> udptable->log, bitmap) && |
WANG Cong | 122ff24 | 2014-05-12 16:04:53 -0700 | [diff] [blame] | 280 | !inet_is_local_reserved_port(net, snum)) |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 281 | goto found; |
| 282 | snum += rand; |
| 283 | } while (snum != first); |
| 284 | spin_unlock_bh(&hslot->lock); |
Eric Dumazet | 5781b23 | 2009-12-13 19:32:39 -0800 | [diff] [blame] | 285 | } while (++first != last); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 286 | goto fail; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 287 | } else { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 288 | hslot = udp_hashslot(udptable, net, snum); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 289 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 290 | if (hslot->count > 10) { |
| 291 | int exist; |
| 292 | unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum; |
| 293 | |
| 294 | slot2 &= udptable->mask; |
| 295 | hash2_nulladdr &= udptable->mask; |
| 296 | |
| 297 | hslot2 = udp_hashslot2(udptable, slot2); |
| 298 | if (hslot->count < hslot2->count) |
| 299 | goto scan_primary_hash; |
| 300 | |
| 301 | exist = udp_lib_lport_inuse2(net, snum, hslot2, |
| 302 | sk, saddr_comp); |
| 303 | if (!exist && (hash2_nulladdr != slot2)) { |
| 304 | hslot2 = udp_hashslot2(udptable, hash2_nulladdr); |
| 305 | exist = udp_lib_lport_inuse2(net, snum, hslot2, |
| 306 | sk, saddr_comp); |
| 307 | } |
| 308 | if (exist) |
| 309 | goto fail_unlock; |
| 310 | else |
| 311 | goto found; |
| 312 | } |
| 313 | scan_primary_hash: |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 314 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, |
| 315 | saddr_comp, 0)) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 316 | goto fail_unlock; |
| 317 | } |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 318 | found: |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 319 | inet_sk(sk)->inet_num = snum; |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 320 | udp_sk(sk)->udp_port_hash = snum; |
| 321 | udp_sk(sk)->udp_portaddr_hash ^= snum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | if (sk_unhashed(sk)) { |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 323 | if (sk->sk_reuseport && |
| 324 | udp_reuseport_add_sock(sk, hslot, saddr_comp)) { |
| 325 | inet_sk(sk)->inet_num = 0; |
| 326 | udp_sk(sk)->udp_port_hash = 0; |
| 327 | udp_sk(sk)->udp_portaddr_hash ^= snum; |
| 328 | goto fail_unlock; |
| 329 | } |
| 330 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 331 | sk_add_node_rcu(sk, &hslot->head); |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 332 | hslot->count++; |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 333 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 334 | |
| 335 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
| 336 | spin_lock(&hslot2->lock); |
Craig Gallek | d894ba1 | 2016-04-12 13:11:25 -0400 | [diff] [blame] | 337 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
David S. Miller | 1602f49 | 2016-04-23 18:26:24 -0400 | [diff] [blame] | 338 | sk->sk_family == AF_INET6) |
| 339 | hlist_add_tail_rcu(&udp_sk(sk)->udp_portaddr_node, |
| 340 | &hslot2->head); |
Craig Gallek | d894ba1 | 2016-04-12 13:11:25 -0400 | [diff] [blame] | 341 | else |
David S. Miller | 1602f49 | 2016-04-23 18:26:24 -0400 | [diff] [blame] | 342 | hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
| 343 | &hslot2->head); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 344 | hslot2->count++; |
| 345 | spin_unlock(&hslot2->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 347 | sock_set_flag(sk, SOCK_RCU_FREE); |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 348 | error = 0; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 349 | fail_unlock: |
| 350 | spin_unlock_bh(&hslot->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | fail: |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 352 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 354 | EXPORT_SYMBOL(udp_lib_get_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 356 | /* match_wildcard == true: 0.0.0.0 equals to any IPv4 addresses |
| 357 | * match_wildcard == false: addresses must be exactly the same, i.e. |
| 358 | * 0.0.0.0 only equals to 0.0.0.0 |
| 359 | */ |
Craig Gallek | c125e80 | 2016-02-10 11:50:40 -0500 | [diff] [blame] | 360 | int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2, |
| 361 | bool match_wildcard) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 362 | { |
| 363 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); |
| 364 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 365 | if (!ipv6_only_sock(sk2)) { |
| 366 | if (inet1->inet_rcv_saddr == inet2->inet_rcv_saddr) |
| 367 | return 1; |
| 368 | if (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr) |
| 369 | return match_wildcard; |
| 370 | } |
| 371 | return 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 372 | } |
| 373 | |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 374 | static u32 udp4_portaddr_hash(const struct net *net, __be32 saddr, |
| 375 | unsigned int port) |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 376 | { |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 377 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 378 | } |
| 379 | |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 380 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 381 | { |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 382 | unsigned int hash2_nulladdr = |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 383 | udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 384 | unsigned int hash2_partial = |
| 385 | udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0); |
| 386 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 387 | /* precompute partial secondary hash */ |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 388 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
| 389 | return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal, hash2_nulladdr); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 390 | } |
| 391 | |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 392 | static int compute_score(struct sock *sk, struct net *net, |
| 393 | __be32 saddr, __be16 sport, |
| 394 | __be32 daddr, unsigned short hnum, int dif) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 395 | { |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 396 | int score; |
| 397 | struct inet_sock *inet; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 398 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 399 | if (!net_eq(sock_net(sk), net) || |
| 400 | udp_sk(sk)->udp_port_hash != hnum || |
| 401 | ipv6_only_sock(sk)) |
| 402 | return -1; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 403 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 404 | score = (sk->sk_family == PF_INET) ? 2 : 1; |
| 405 | inet = inet_sk(sk); |
| 406 | |
| 407 | if (inet->inet_rcv_saddr) { |
| 408 | if (inet->inet_rcv_saddr != daddr) |
| 409 | return -1; |
| 410 | score += 4; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 411 | } |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 412 | |
| 413 | if (inet->inet_daddr) { |
| 414 | if (inet->inet_daddr != saddr) |
| 415 | return -1; |
| 416 | score += 4; |
| 417 | } |
| 418 | |
| 419 | if (inet->inet_dport) { |
| 420 | if (inet->inet_dport != sport) |
| 421 | return -1; |
| 422 | score += 4; |
| 423 | } |
| 424 | |
| 425 | if (sk->sk_bound_dev_if) { |
| 426 | if (sk->sk_bound_dev_if != dif) |
| 427 | return -1; |
| 428 | score += 4; |
| 429 | } |
Eric Dumazet | 70da268 | 2015-10-08 19:33:21 -0700 | [diff] [blame] | 430 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
| 431 | score++; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 432 | return score; |
| 433 | } |
| 434 | |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 435 | static u32 udp_ehashfn(const struct net *net, const __be32 laddr, |
| 436 | const __u16 lport, const __be32 faddr, |
| 437 | const __be16 fport) |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 438 | { |
Hannes Frederic Sowa | 1bbdcee | 2013-10-19 21:48:57 +0200 | [diff] [blame] | 439 | static u32 udp_ehash_secret __read_mostly; |
| 440 | |
| 441 | net_get_random_once(&udp_ehash_secret, sizeof(udp_ehash_secret)); |
| 442 | |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 443 | return __inet_ehashfn(laddr, lport, faddr, fport, |
Hannes Frederic Sowa | 1bbdcee | 2013-10-19 21:48:57 +0200 | [diff] [blame] | 444 | udp_ehash_secret + net_hash_mix(net)); |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 445 | } |
| 446 | |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 447 | /* called with rcu_read_lock() */ |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 448 | static struct sock *udp4_lib_lookup2(struct net *net, |
| 449 | __be32 saddr, __be16 sport, |
| 450 | __be32 daddr, unsigned int hnum, int dif, |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 451 | struct udp_hslot *hslot2, |
Craig Gallek | 1134158 | 2016-01-05 15:08:07 -0500 | [diff] [blame] | 452 | struct sk_buff *skb) |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 453 | { |
| 454 | struct sock *sk, *result; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 455 | int score, badness, matches = 0, reuseport = 0; |
| 456 | u32 hash = 0; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 457 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 458 | result = NULL; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 459 | badness = 0; |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 460 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 461 | score = compute_score(sk, net, saddr, sport, |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 462 | daddr, hnum, dif); |
| 463 | if (score > badness) { |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 464 | reuseport = sk->sk_reuseport; |
| 465 | if (reuseport) { |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 466 | hash = udp_ehashfn(net, daddr, hnum, |
| 467 | saddr, sport); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 468 | result = reuseport_select_sock(sk, hash, skb, |
Eric Dumazet | ed0dfff | 2016-01-19 08:36:43 -0800 | [diff] [blame] | 469 | sizeof(struct udphdr)); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 470 | if (result) |
| 471 | return result; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 472 | matches = 1; |
| 473 | } |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 474 | badness = score; |
| 475 | result = sk; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 476 | } else if (score == badness && reuseport) { |
| 477 | matches++; |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 478 | if (reciprocal_scale(hash, matches) == 0) |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 479 | result = sk; |
| 480 | hash = next_pseudo_random32(hash); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 481 | } |
| 482 | } |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 483 | return result; |
| 484 | } |
| 485 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 486 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
| 487 | * harder than this. -DaveM |
| 488 | */ |
Pavel Emelyanov | fce8233 | 2011-12-09 06:23:34 +0000 | [diff] [blame] | 489 | struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 490 | __be16 sport, __be32 daddr, __be16 dport, |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 491 | int dif, struct udp_table *udptable, struct sk_buff *skb) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 492 | { |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 493 | struct sock *sk, *result; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 494 | unsigned short hnum = ntohs(dport); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 495 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
| 496 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 497 | int score, badness, matches = 0, reuseport = 0; |
| 498 | u32 hash = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 499 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 500 | if (hslot->count > 10) { |
| 501 | hash2 = udp4_portaddr_hash(net, daddr, hnum); |
| 502 | slot2 = hash2 & udptable->mask; |
| 503 | hslot2 = &udptable->hash2[slot2]; |
| 504 | if (hslot->count < hslot2->count) |
| 505 | goto begin; |
| 506 | |
| 507 | result = udp4_lib_lookup2(net, saddr, sport, |
| 508 | daddr, hnum, dif, |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 509 | hslot2, skb); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 510 | if (!result) { |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 511 | unsigned int old_slot2 = slot2; |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 512 | hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 513 | slot2 = hash2 & udptable->mask; |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 514 | /* avoid searching the same slot again. */ |
| 515 | if (unlikely(slot2 == old_slot2)) |
| 516 | return result; |
| 517 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 518 | hslot2 = &udptable->hash2[slot2]; |
| 519 | if (hslot->count < hslot2->count) |
| 520 | goto begin; |
| 521 | |
Jorge Boncompte [DTI2] | 1223c67 | 2010-04-08 04:56:48 +0000 | [diff] [blame] | 522 | result = udp4_lib_lookup2(net, saddr, sport, |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 523 | daddr, hnum, dif, |
| 524 | hslot2, skb); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 525 | } |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 526 | return result; |
| 527 | } |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 528 | begin: |
| 529 | result = NULL; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 530 | badness = 0; |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 531 | sk_for_each_rcu(sk, &hslot->head) { |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 532 | score = compute_score(sk, net, saddr, sport, |
| 533 | daddr, hnum, dif); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 534 | if (score > badness) { |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 535 | reuseport = sk->sk_reuseport; |
| 536 | if (reuseport) { |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 537 | hash = udp_ehashfn(net, daddr, hnum, |
| 538 | saddr, sport); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 539 | result = reuseport_select_sock(sk, hash, skb, |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 540 | sizeof(struct udphdr)); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 541 | if (result) |
| 542 | return result; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 543 | matches = 1; |
| 544 | } |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 545 | result = sk; |
| 546 | badness = score; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 547 | } else if (score == badness && reuseport) { |
| 548 | matches++; |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 549 | if (reciprocal_scale(hash, matches) == 0) |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 550 | result = sk; |
| 551 | hash = next_pseudo_random32(hash); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 552 | } |
| 553 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 554 | return result; |
| 555 | } |
Pavel Emelyanov | fce8233 | 2011-12-09 06:23:34 +0000 | [diff] [blame] | 556 | EXPORT_SYMBOL_GPL(__udp4_lib_lookup); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 557 | |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 558 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
| 559 | __be16 sport, __be16 dport, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 560 | struct udp_table *udptable) |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 561 | { |
| 562 | const struct iphdr *iph = ip_hdr(skb); |
| 563 | |
Alexander Duyck | ed7cbbc | 2016-05-12 16:23:44 -0700 | [diff] [blame] | 564 | return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport, |
Eric Dumazet | 8afdd99 | 2013-12-10 18:07:23 -0800 | [diff] [blame] | 565 | iph->daddr, dport, inet_iif(skb), |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 566 | udptable, skb); |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 567 | } |
| 568 | |
Tom Herbert | 6305830 | 2016-04-05 08:22:50 -0700 | [diff] [blame] | 569 | struct sock *udp4_lib_lookup_skb(struct sk_buff *skb, |
| 570 | __be16 sport, __be16 dport) |
| 571 | { |
Alexander Duyck | ed7cbbc | 2016-05-12 16:23:44 -0700 | [diff] [blame] | 572 | return __udp4_lib_lookup_skb(skb, sport, dport, &udp_table); |
Tom Herbert | 6305830 | 2016-04-05 08:22:50 -0700 | [diff] [blame] | 573 | } |
| 574 | EXPORT_SYMBOL_GPL(udp4_lib_lookup_skb); |
| 575 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 576 | /* Must be called under rcu_read_lock(). |
| 577 | * Does increment socket refcount. |
| 578 | */ |
| 579 | #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ |
| 580 | IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) |
KOVACS Krisztian | bcd4130 | 2008-10-01 07:48:10 -0700 | [diff] [blame] | 581 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
| 582 | __be32 daddr, __be16 dport, int dif) |
| 583 | { |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 584 | struct sock *sk; |
| 585 | |
| 586 | sk = __udp4_lib_lookup(net, saddr, sport, daddr, dport, |
| 587 | dif, &udp_table, NULL); |
| 588 | if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) |
| 589 | sk = NULL; |
| 590 | return sk; |
KOVACS Krisztian | bcd4130 | 2008-10-01 07:48:10 -0700 | [diff] [blame] | 591 | } |
| 592 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 593 | #endif |
KOVACS Krisztian | bcd4130 | 2008-10-01 07:48:10 -0700 | [diff] [blame] | 594 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 595 | static inline bool __udp_is_mcast_sock(struct net *net, struct sock *sk, |
| 596 | __be16 loc_port, __be32 loc_addr, |
| 597 | __be16 rmt_port, __be32 rmt_addr, |
| 598 | int dif, unsigned short hnum) |
| 599 | { |
| 600 | struct inet_sock *inet = inet_sk(sk); |
| 601 | |
| 602 | if (!net_eq(sock_net(sk), net) || |
| 603 | udp_sk(sk)->udp_port_hash != hnum || |
| 604 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || |
| 605 | (inet->inet_dport != rmt_port && inet->inet_dport) || |
| 606 | (inet->inet_rcv_saddr && inet->inet_rcv_saddr != loc_addr) || |
| 607 | ipv6_only_sock(sk) || |
| 608 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) |
| 609 | return false; |
| 610 | if (!ip_mc_sf_allow(sk, loc_addr, rmt_addr, dif)) |
| 611 | return false; |
| 612 | return true; |
| 613 | } |
| 614 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 615 | /* |
| 616 | * This routine is called by the ICMP module when it gets some |
| 617 | * sort of error condition. If err < 0 then the socket should |
| 618 | * be closed and the error returned to the user. If err > 0 |
| 619 | * it's just the icmp type << 8 | icmp code. |
| 620 | * Header points to the ip header of the error packet. We move |
| 621 | * on past this. Then (as it used to claim before adjustment) |
| 622 | * header points to the first 8 bytes of the udp header. We need |
| 623 | * to find the appropriate port. |
| 624 | */ |
| 625 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 626 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 627 | { |
| 628 | struct inet_sock *inet; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 629 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 630 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 631 | const int type = icmp_hdr(skb)->type; |
| 632 | const int code = icmp_hdr(skb)->code; |
| 633 | struct sock *sk; |
| 634 | int harderr; |
| 635 | int err; |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 636 | struct net *net = dev_net(skb->dev); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 637 | |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 638 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 639 | iph->saddr, uh->source, skb->dev->ifindex, udptable, |
| 640 | NULL); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 641 | if (!sk) { |
Eric Dumazet | 5d3848b | 2016-04-27 16:44:29 -0700 | [diff] [blame] | 642 | __ICMP_INC_STATS(net, ICMP_MIB_INERRORS); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 643 | return; /* No socket for error */ |
| 644 | } |
| 645 | |
| 646 | err = 0; |
| 647 | harderr = 0; |
| 648 | inet = inet_sk(sk); |
| 649 | |
| 650 | switch (type) { |
| 651 | default: |
| 652 | case ICMP_TIME_EXCEEDED: |
| 653 | err = EHOSTUNREACH; |
| 654 | break; |
| 655 | case ICMP_SOURCE_QUENCH: |
| 656 | goto out; |
| 657 | case ICMP_PARAMETERPROB: |
| 658 | err = EPROTO; |
| 659 | harderr = 1; |
| 660 | break; |
| 661 | case ICMP_DEST_UNREACH: |
| 662 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 663 | ipv4_sk_update_pmtu(skb, sk, info); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 664 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { |
| 665 | err = EMSGSIZE; |
| 666 | harderr = 1; |
| 667 | break; |
| 668 | } |
| 669 | goto out; |
| 670 | } |
| 671 | err = EHOSTUNREACH; |
| 672 | if (code <= NR_ICMP_UNREACH) { |
| 673 | harderr = icmp_err_convert[code].fatal; |
| 674 | err = icmp_err_convert[code].errno; |
| 675 | } |
| 676 | break; |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 677 | case ICMP_REDIRECT: |
| 678 | ipv4_sk_redirect(skb, sk); |
Duan Jiong | 1a462d1 | 2013-09-20 18:20:28 +0800 | [diff] [blame] | 679 | goto out; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | /* |
| 683 | * RFC1122: OK. Passes ICMP errors back to application, as per |
| 684 | * 4.1.3.3. |
| 685 | */ |
| 686 | if (!inet->recverr) { |
| 687 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
| 688 | goto out; |
Eric Dumazet | b1faf56 | 2010-05-31 23:44:05 -0700 | [diff] [blame] | 689 | } else |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 690 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
Eric Dumazet | b1faf56 | 2010-05-31 23:44:05 -0700 | [diff] [blame] | 691 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 692 | sk->sk_err = err; |
| 693 | sk->sk_error_report(sk); |
| 694 | out: |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 695 | return; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 696 | } |
| 697 | |
| 698 | void udp_err(struct sk_buff *skb, u32 info) |
| 699 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 700 | __udp4_lib_err(skb, info, &udp_table); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | /* |
| 704 | * Throw away all pending data and cancel the corking. Socket is locked. |
| 705 | */ |
Denis V. Lunev | 36d926b | 2008-06-04 15:49:07 +0400 | [diff] [blame] | 706 | void udp_flush_pending_frames(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 707 | { |
| 708 | struct udp_sock *up = udp_sk(sk); |
| 709 | |
| 710 | if (up->pending) { |
| 711 | up->len = 0; |
| 712 | up->pending = 0; |
| 713 | ip_flush_pending_frames(sk); |
| 714 | } |
| 715 | } |
Denis V. Lunev | 36d926b | 2008-06-04 15:49:07 +0400 | [diff] [blame] | 716 | EXPORT_SYMBOL(udp_flush_pending_frames); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 717 | |
| 718 | /** |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 719 | * udp4_hwcsum - handle outgoing HW checksumming |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 720 | * @skb: sk_buff containing the filled-in UDP header |
| 721 | * (checksum field must be zeroed out) |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 722 | * @src: source IP address |
| 723 | * @dst: destination IP address |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 724 | */ |
Thomas Graf | c26bf4a | 2013-07-25 18:12:18 +0200 | [diff] [blame] | 725 | void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 726 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 727 | struct udphdr *uh = udp_hdr(skb); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 728 | int offset = skb_transport_offset(skb); |
| 729 | int len = skb->len - offset; |
| 730 | int hlen = len; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 731 | __wsum csum = 0; |
| 732 | |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 733 | if (!skb_has_frag_list(skb)) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 734 | /* |
| 735 | * Only one fragment on the socket. |
| 736 | */ |
| 737 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 738 | skb->csum_offset = offsetof(struct udphdr, check); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 739 | uh->check = ~csum_tcpudp_magic(src, dst, len, |
| 740 | IPPROTO_UDP, 0); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 741 | } else { |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 742 | struct sk_buff *frags; |
| 743 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 744 | /* |
| 745 | * HW-checksum won't work as there are two or more |
| 746 | * fragments on the socket so that all csums of sk_buffs |
| 747 | * should be together |
| 748 | */ |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 749 | skb_walk_frags(skb, frags) { |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 750 | csum = csum_add(csum, frags->csum); |
| 751 | hlen -= frags->len; |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 752 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 753 | |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 754 | csum = skb_checksum(skb, offset, hlen, csum); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 755 | skb->ip_summed = CHECKSUM_NONE; |
| 756 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 757 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); |
| 758 | if (uh->check == 0) |
| 759 | uh->check = CSUM_MANGLED_0; |
| 760 | } |
| 761 | } |
Thomas Graf | c26bf4a | 2013-07-25 18:12:18 +0200 | [diff] [blame] | 762 | EXPORT_SYMBOL_GPL(udp4_hwcsum); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 763 | |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 764 | /* Function to set UDP checksum for an IPv4 UDP packet. This is intended |
| 765 | * for the simple case like when setting the checksum for a UDP tunnel. |
| 766 | */ |
| 767 | void udp_set_csum(bool nocheck, struct sk_buff *skb, |
| 768 | __be32 saddr, __be32 daddr, int len) |
| 769 | { |
| 770 | struct udphdr *uh = udp_hdr(skb); |
| 771 | |
Edward Cree | 179bc67 | 2016-02-11 20:48:04 +0000 | [diff] [blame] | 772 | if (nocheck) { |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 773 | uh->check = 0; |
Edward Cree | 179bc67 | 2016-02-11 20:48:04 +0000 | [diff] [blame] | 774 | } else if (skb_is_gso(skb)) { |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 775 | uh->check = ~udp_v4_check(len, saddr, daddr, 0); |
Edward Cree | 179bc67 | 2016-02-11 20:48:04 +0000 | [diff] [blame] | 776 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 777 | uh->check = 0; |
| 778 | uh->check = udp_v4_check(len, saddr, daddr, lco_csum(skb)); |
| 779 | if (uh->check == 0) |
| 780 | uh->check = CSUM_MANGLED_0; |
Edward Cree | d75f130 | 2016-02-11 20:49:40 +0000 | [diff] [blame] | 781 | } else { |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 782 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 783 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 784 | skb->csum_offset = offsetof(struct udphdr, check); |
| 785 | uh->check = ~udp_v4_check(len, saddr, daddr, 0); |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 786 | } |
| 787 | } |
| 788 | EXPORT_SYMBOL(udp_set_csum); |
| 789 | |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 790 | static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4) |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 791 | { |
| 792 | struct sock *sk = skb->sk; |
| 793 | struct inet_sock *inet = inet_sk(sk); |
| 794 | struct udphdr *uh; |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 795 | int err = 0; |
| 796 | int is_udplite = IS_UDPLITE(sk); |
| 797 | int offset = skb_transport_offset(skb); |
| 798 | int len = skb->len - offset; |
| 799 | __wsum csum = 0; |
| 800 | |
| 801 | /* |
| 802 | * Create a UDP header |
| 803 | */ |
| 804 | uh = udp_hdr(skb); |
| 805 | uh->source = inet->inet_sport; |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 806 | uh->dest = fl4->fl4_dport; |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 807 | uh->len = htons(len); |
| 808 | uh->check = 0; |
| 809 | |
| 810 | if (is_udplite) /* UDP-Lite */ |
| 811 | csum = udplite_csum(skb); |
| 812 | |
Willem de Bruijn | 33dc6a6 | 2017-08-10 12:29:19 -0400 | [diff] [blame] | 813 | else if (sk->sk_no_check_tx && !skb_is_gso(skb)) { /* UDP csum off */ |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 814 | |
| 815 | skb->ip_summed = CHECKSUM_NONE; |
| 816 | goto send; |
| 817 | |
| 818 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
| 819 | |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 820 | udp4_hwcsum(skb, fl4->saddr, fl4->daddr); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 821 | goto send; |
| 822 | |
| 823 | } else |
| 824 | csum = udp_csum(skb); |
| 825 | |
| 826 | /* add protocol-dependent pseudo-header */ |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 827 | uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len, |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 828 | sk->sk_protocol, csum); |
| 829 | if (uh->check == 0) |
| 830 | uh->check = CSUM_MANGLED_0; |
| 831 | |
| 832 | send: |
Eric Dumazet | b5ec8ee | 2012-08-10 02:22:47 +0000 | [diff] [blame] | 833 | err = ip_send_skb(sock_net(sk), skb); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 834 | if (err) { |
| 835 | if (err == -ENOBUFS && !inet->recverr) { |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 836 | UDP_INC_STATS(sock_net(sk), |
| 837 | UDP_MIB_SNDBUFERRORS, is_udplite); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 838 | err = 0; |
| 839 | } |
| 840 | } else |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 841 | UDP_INC_STATS(sock_net(sk), |
| 842 | UDP_MIB_OUTDATAGRAMS, is_udplite); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 843 | return err; |
| 844 | } |
| 845 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 846 | /* |
| 847 | * Push out all pending data as one UDP datagram. Socket is locked. |
| 848 | */ |
Hannes Frederic Sowa | 8822b64 | 2013-07-01 20:21:30 +0200 | [diff] [blame] | 849 | int udp_push_pending_frames(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 850 | { |
| 851 | struct udp_sock *up = udp_sk(sk); |
| 852 | struct inet_sock *inet = inet_sk(sk); |
David S. Miller | b6f21b2 | 2011-03-12 02:09:18 -0500 | [diff] [blame] | 853 | struct flowi4 *fl4 = &inet->cork.fl.u.ip4; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 854 | struct sk_buff *skb; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 855 | int err = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 856 | |
David S. Miller | 77968b7 | 2011-05-08 17:12:19 -0700 | [diff] [blame] | 857 | skb = ip_finish_skb(sk, fl4); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 858 | if (!skb) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 859 | goto out; |
| 860 | |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 861 | err = udp_send_skb(skb, fl4); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 862 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 863 | out: |
| 864 | up->len = 0; |
| 865 | up->pending = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 866 | return err; |
| 867 | } |
Hannes Frederic Sowa | 8822b64 | 2013-07-01 20:21:30 +0200 | [diff] [blame] | 868 | EXPORT_SYMBOL(udp_push_pending_frames); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 869 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 870 | int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 871 | { |
| 872 | struct inet_sock *inet = inet_sk(sk); |
| 873 | struct udp_sock *up = udp_sk(sk); |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 874 | struct flowi4 fl4_stack; |
David S. Miller | b6f21b2 | 2011-03-12 02:09:18 -0500 | [diff] [blame] | 875 | struct flowi4 *fl4; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 876 | int ulen = len; |
| 877 | struct ipcm_cookie ipc; |
| 878 | struct rtable *rt = NULL; |
| 879 | int free = 0; |
| 880 | int connected = 0; |
| 881 | __be32 daddr, faddr, saddr; |
| 882 | __be16 dport; |
| 883 | u8 tos; |
| 884 | int err, is_udplite = IS_UDPLITE(sk); |
| 885 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
| 886 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 887 | struct sk_buff *skb; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 888 | struct ip_options_data opt_copy; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 889 | |
| 890 | if (len > 0xFFFF) |
| 891 | return -EMSGSIZE; |
| 892 | |
| 893 | /* |
| 894 | * Check the flags. |
| 895 | */ |
| 896 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 897 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 898 | return -EOPNOTSUPP; |
| 899 | |
| 900 | ipc.opt = NULL; |
Oliver Hartkopp | 2244d07 | 2010-08-17 08:59:14 +0000 | [diff] [blame] | 901 | ipc.tx_flags = 0; |
Francesco Fusco | aa66158 | 2013-09-24 15:43:09 +0200 | [diff] [blame] | 902 | ipc.ttl = 0; |
| 903 | ipc.tos = -1; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 904 | |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 905 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
| 906 | |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 907 | fl4 = &inet->cork.fl.u.ip4; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 908 | if (up->pending) { |
| 909 | /* |
| 910 | * There are pending frames. |
| 911 | * The socket lock must be held while it's corked. |
| 912 | */ |
| 913 | lock_sock(sk); |
| 914 | if (likely(up->pending)) { |
| 915 | if (unlikely(up->pending != AF_INET)) { |
| 916 | release_sock(sk); |
| 917 | return -EINVAL; |
| 918 | } |
| 919 | goto do_append_data; |
| 920 | } |
| 921 | release_sock(sk); |
| 922 | } |
| 923 | ulen += sizeof(struct udphdr); |
| 924 | |
| 925 | /* |
| 926 | * Get and verify the address. |
| 927 | */ |
| 928 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 929 | DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 930 | if (msg->msg_namelen < sizeof(*usin)) |
| 931 | return -EINVAL; |
| 932 | if (usin->sin_family != AF_INET) { |
| 933 | if (usin->sin_family != AF_UNSPEC) |
| 934 | return -EAFNOSUPPORT; |
| 935 | } |
| 936 | |
| 937 | daddr = usin->sin_addr.s_addr; |
| 938 | dport = usin->sin_port; |
| 939 | if (dport == 0) |
| 940 | return -EINVAL; |
| 941 | } else { |
| 942 | if (sk->sk_state != TCP_ESTABLISHED) |
| 943 | return -EDESTADDRREQ; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 944 | daddr = inet->inet_daddr; |
| 945 | dport = inet->inet_dport; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 946 | /* Open fast path for connected socket. |
| 947 | Route will not be used, if at least one option is set. |
| 948 | */ |
| 949 | connected = 1; |
| 950 | } |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 951 | |
| 952 | ipc.sockc.tsflags = sk->sk_tsflags; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 953 | ipc.addr = inet->inet_saddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 954 | ipc.oif = sk->sk_bound_dev_if; |
Daniel Borkmann | bf84a01 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 955 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 956 | if (msg->msg_controllen) { |
Soheil Hassas Yeganeh | 24025c4 | 2016-04-02 23:08:10 -0400 | [diff] [blame] | 957 | err = ip_cmsg_send(sk, msg, &ipc, sk->sk_family == AF_INET6); |
Eric Dumazet | 9194830 | 2016-02-04 06:23:28 -0800 | [diff] [blame] | 958 | if (unlikely(err)) { |
| 959 | kfree(ipc.opt); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 960 | return err; |
Eric Dumazet | 9194830 | 2016-02-04 06:23:28 -0800 | [diff] [blame] | 961 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 962 | if (ipc.opt) |
| 963 | free = 1; |
| 964 | connected = 0; |
| 965 | } |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 966 | if (!ipc.opt) { |
| 967 | struct ip_options_rcu *inet_opt; |
| 968 | |
| 969 | rcu_read_lock(); |
| 970 | inet_opt = rcu_dereference(inet->inet_opt); |
| 971 | if (inet_opt) { |
| 972 | memcpy(&opt_copy, inet_opt, |
| 973 | sizeof(*inet_opt) + inet_opt->opt.optlen); |
| 974 | ipc.opt = &opt_copy.opt; |
| 975 | } |
| 976 | rcu_read_unlock(); |
| 977 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 978 | |
| 979 | saddr = ipc.addr; |
| 980 | ipc.addr = faddr = daddr; |
| 981 | |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 982 | sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags); |
| 983 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 984 | if (ipc.opt && ipc.opt->opt.srr) { |
Andrey Ignatov | d664986 | 2018-05-10 10:59:34 -0700 | [diff] [blame^] | 985 | if (!daddr) { |
| 986 | err = -EINVAL; |
| 987 | goto out_free; |
| 988 | } |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 989 | faddr = ipc.opt->opt.faddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 990 | connected = 0; |
| 991 | } |
Francesco Fusco | aa66158 | 2013-09-24 15:43:09 +0200 | [diff] [blame] | 992 | tos = get_rttos(&ipc, inet); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 993 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
| 994 | (msg->msg_flags & MSG_DONTROUTE) || |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 995 | (ipc.opt && ipc.opt->opt.is_strictroute)) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 996 | tos |= RTO_ONLINK; |
| 997 | connected = 0; |
| 998 | } |
| 999 | |
| 1000 | if (ipv4_is_multicast(daddr)) { |
| 1001 | if (!ipc.oif) |
| 1002 | ipc.oif = inet->mc_index; |
| 1003 | if (!saddr) |
| 1004 | saddr = inet->mc_addr; |
| 1005 | connected = 0; |
Erich E. Hoover | 76e2105 | 2012-02-08 09:11:07 +0000 | [diff] [blame] | 1006 | } else if (!ipc.oif) |
| 1007 | ipc.oif = inet->uc_index; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1008 | |
| 1009 | if (connected) |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1010 | rt = (struct rtable *)sk_dst_check(sk, 0); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1011 | |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1012 | if (!rt) { |
Pavel Emelyanov | 84a3aa0 | 2008-07-16 20:19:08 -0700 | [diff] [blame] | 1013 | struct net *net = sock_net(sk); |
David Ahern | 9a24abf | 2015-08-13 14:59:03 -0600 | [diff] [blame] | 1014 | __u8 flow_flags = inet_sk_flowi_flags(sk); |
Pavel Emelyanov | 84a3aa0 | 2008-07-16 20:19:08 -0700 | [diff] [blame] | 1015 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1016 | fl4 = &fl4_stack; |
David Ahern | 9a24abf | 2015-08-13 14:59:03 -0600 | [diff] [blame] | 1017 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1018 | flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos, |
David S. Miller | c0951cb | 2011-03-31 04:54:27 -0700 | [diff] [blame] | 1019 | RT_SCOPE_UNIVERSE, sk->sk_protocol, |
David Ahern | 9a24abf | 2015-08-13 14:59:03 -0600 | [diff] [blame] | 1020 | flow_flags, |
David S. Miller | c0951cb | 2011-03-31 04:54:27 -0700 | [diff] [blame] | 1021 | faddr, saddr, dport, inet->inet_sport); |
| 1022 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1023 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
| 1024 | rt = ip_route_output_flow(net, fl4, sk); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1025 | if (IS_ERR(rt)) { |
| 1026 | err = PTR_ERR(rt); |
David S. Miller | 06dc94b | 2011-03-03 10:38:01 -0800 | [diff] [blame] | 1027 | rt = NULL; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1028 | if (err == -ENETUNREACH) |
Eric Dumazet | f1d8cba | 2013-11-28 09:51:22 -0800 | [diff] [blame] | 1029 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1030 | goto out; |
| 1031 | } |
| 1032 | |
| 1033 | err = -EACCES; |
| 1034 | if ((rt->rt_flags & RTCF_BROADCAST) && |
| 1035 | !sock_flag(sk, SOCK_BROADCAST)) |
| 1036 | goto out; |
| 1037 | if (connected) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1038 | sk_dst_set(sk, dst_clone(&rt->dst)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1039 | } |
| 1040 | |
| 1041 | if (msg->msg_flags&MSG_CONFIRM) |
| 1042 | goto do_confirm; |
| 1043 | back_from_confirm: |
| 1044 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1045 | saddr = fl4->saddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1046 | if (!ipc.addr) |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1047 | daddr = ipc.addr = fl4->daddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1048 | |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 1049 | /* Lockless fast path for the non-corking case. */ |
| 1050 | if (!corkreq) { |
Al Viro | f69e6d1 | 2014-11-24 13:23:40 -0500 | [diff] [blame] | 1051 | skb = ip_make_skb(sk, fl4, getfrag, msg, ulen, |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 1052 | sizeof(struct udphdr), &ipc, &rt, |
| 1053 | msg->msg_flags); |
| 1054 | err = PTR_ERR(skb); |
YOSHIFUJI Hideaki / 吉藤英明 | 50c3a48 | 2013-01-22 06:32:49 +0000 | [diff] [blame] | 1055 | if (!IS_ERR_OR_NULL(skb)) |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 1056 | err = udp_send_skb(skb, fl4); |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 1057 | goto out; |
| 1058 | } |
| 1059 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1060 | lock_sock(sk); |
| 1061 | if (unlikely(up->pending)) { |
| 1062 | /* The socket is already corked while preparing it. */ |
| 1063 | /* ... which is an evident application bug. --ANK */ |
| 1064 | release_sock(sk); |
| 1065 | |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1066 | net_dbg_ratelimited("cork app bug 2\n"); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1067 | err = -EINVAL; |
| 1068 | goto out; |
| 1069 | } |
| 1070 | /* |
| 1071 | * Now cork the socket to pend data. |
| 1072 | */ |
David S. Miller | b6f21b2 | 2011-03-12 02:09:18 -0500 | [diff] [blame] | 1073 | fl4 = &inet->cork.fl.u.ip4; |
| 1074 | fl4->daddr = daddr; |
| 1075 | fl4->saddr = saddr; |
David S. Miller | 9cce96d | 2011-03-12 03:00:33 -0500 | [diff] [blame] | 1076 | fl4->fl4_dport = dport; |
| 1077 | fl4->fl4_sport = inet->inet_sport; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1078 | up->pending = AF_INET; |
| 1079 | |
| 1080 | do_append_data: |
| 1081 | up->len += ulen; |
Al Viro | f69e6d1 | 2014-11-24 13:23:40 -0500 | [diff] [blame] | 1082 | err = ip_append_data(sk, fl4, getfrag, msg, ulen, |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 1083 | sizeof(struct udphdr), &ipc, &rt, |
| 1084 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1085 | if (err) |
| 1086 | udp_flush_pending_frames(sk); |
| 1087 | else if (!corkreq) |
| 1088 | err = udp_push_pending_frames(sk); |
| 1089 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
| 1090 | up->pending = 0; |
| 1091 | release_sock(sk); |
| 1092 | |
| 1093 | out: |
| 1094 | ip_rt_put(rt); |
Andrey Ignatov | d664986 | 2018-05-10 10:59:34 -0700 | [diff] [blame^] | 1095 | out_free: |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1096 | if (free) |
| 1097 | kfree(ipc.opt); |
| 1098 | if (!err) |
| 1099 | return len; |
| 1100 | /* |
| 1101 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting |
| 1102 | * ENOBUFS might not be good (it's not tunable per se), but otherwise |
| 1103 | * we don't have a good statistic (IpOutDiscards but it can be too many |
| 1104 | * things). We could add another new stat but at least for now that |
| 1105 | * seems like overkill. |
| 1106 | */ |
| 1107 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 1108 | UDP_INC_STATS(sock_net(sk), |
| 1109 | UDP_MIB_SNDBUFERRORS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1110 | } |
| 1111 | return err; |
| 1112 | |
| 1113 | do_confirm: |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1114 | dst_confirm(&rt->dst); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1115 | if (!(msg->msg_flags&MSG_PROBE) || len) |
| 1116 | goto back_from_confirm; |
| 1117 | err = 0; |
| 1118 | goto out; |
| 1119 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1120 | EXPORT_SYMBOL(udp_sendmsg); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1121 | |
| 1122 | int udp_sendpage(struct sock *sk, struct page *page, int offset, |
| 1123 | size_t size, int flags) |
| 1124 | { |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 1125 | struct inet_sock *inet = inet_sk(sk); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1126 | struct udp_sock *up = udp_sk(sk); |
| 1127 | int ret; |
| 1128 | |
Shawn Landden | d3f7d56 | 2013-11-24 22:36:28 -0800 | [diff] [blame] | 1129 | if (flags & MSG_SENDPAGE_NOTLAST) |
| 1130 | flags |= MSG_MORE; |
| 1131 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1132 | if (!up->pending) { |
| 1133 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; |
| 1134 | |
| 1135 | /* Call udp_sendmsg to specify destination address which |
| 1136 | * sendpage interface can't pass. |
| 1137 | * This will succeed only when the socket is connected. |
| 1138 | */ |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1139 | ret = udp_sendmsg(sk, &msg, 0); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1140 | if (ret < 0) |
| 1141 | return ret; |
| 1142 | } |
| 1143 | |
| 1144 | lock_sock(sk); |
| 1145 | |
| 1146 | if (unlikely(!up->pending)) { |
| 1147 | release_sock(sk); |
| 1148 | |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1149 | net_dbg_ratelimited("udp cork app bug 3\n"); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1150 | return -EINVAL; |
| 1151 | } |
| 1152 | |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 1153 | ret = ip_append_page(sk, &inet->cork.fl.u.ip4, |
| 1154 | page, offset, size, flags); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1155 | if (ret == -EOPNOTSUPP) { |
| 1156 | release_sock(sk); |
| 1157 | return sock_no_sendpage(sk->sk_socket, page, offset, |
| 1158 | size, flags); |
| 1159 | } |
| 1160 | if (ret < 0) { |
| 1161 | udp_flush_pending_frames(sk); |
| 1162 | goto out; |
| 1163 | } |
| 1164 | |
| 1165 | up->len += size; |
| 1166 | if (!(up->corkflag || (flags&MSG_MORE))) |
| 1167 | ret = udp_push_pending_frames(sk); |
| 1168 | if (!ret) |
| 1169 | ret = size; |
| 1170 | out: |
| 1171 | release_sock(sk); |
| 1172 | return ret; |
| 1173 | } |
| 1174 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1175 | /** |
| 1176 | * first_packet_length - return length of first packet in receive queue |
| 1177 | * @sk: socket |
| 1178 | * |
| 1179 | * Drops all bad checksum frames, until a valid one is found. |
Eric Dumazet | e83c674 | 2016-08-23 13:59:33 -0700 | [diff] [blame] | 1180 | * Returns the length of found skb, or -1 if none is found. |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1181 | */ |
Eric Dumazet | e83c674 | 2016-08-23 13:59:33 -0700 | [diff] [blame] | 1182 | static int first_packet_length(struct sock *sk) |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1183 | { |
| 1184 | struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue; |
| 1185 | struct sk_buff *skb; |
Eric Dumazet | e83c674 | 2016-08-23 13:59:33 -0700 | [diff] [blame] | 1186 | int res; |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1187 | |
| 1188 | __skb_queue_head_init(&list_kill); |
| 1189 | |
| 1190 | spin_lock_bh(&rcvq->lock); |
| 1191 | while ((skb = skb_peek(rcvq)) != NULL && |
| 1192 | udp_lib_checksum_complete(skb)) { |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1193 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, |
| 1194 | IS_UDPLITE(sk)); |
| 1195 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
| 1196 | IS_UDPLITE(sk)); |
Eric Dumazet | 8edf19c | 2009-10-15 00:12:40 +0000 | [diff] [blame] | 1197 | atomic_inc(&sk->sk_drops); |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1198 | __skb_unlink(skb, rcvq); |
| 1199 | __skb_queue_tail(&list_kill, skb); |
| 1200 | } |
Eric Dumazet | e83c674 | 2016-08-23 13:59:33 -0700 | [diff] [blame] | 1201 | res = skb ? skb->len : -1; |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1202 | spin_unlock_bh(&rcvq->lock); |
| 1203 | |
| 1204 | if (!skb_queue_empty(&list_kill)) { |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1205 | bool slow = lock_sock_fast(sk); |
| 1206 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1207 | __skb_queue_purge(&list_kill); |
| 1208 | sk_mem_reclaim_partial(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1209 | unlock_sock_fast(sk, slow); |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1210 | } |
| 1211 | return res; |
| 1212 | } |
| 1213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | /* |
| 1215 | * IOCTL requests applicable to the UDP protocol |
| 1216 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 1219 | { |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1220 | switch (cmd) { |
| 1221 | case SIOCOUTQ: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | { |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 1223 | int amount = sk_wmem_alloc_get(sk); |
| 1224 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1225 | return put_user(amount, (int __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | } |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1227 | |
| 1228 | case SIOCINQ: |
| 1229 | { |
Eric Dumazet | e83c674 | 2016-08-23 13:59:33 -0700 | [diff] [blame] | 1230 | int amount = max_t(int, 0, first_packet_length(sk)); |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1231 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1232 | return put_user(amount, (int __user *)arg); |
| 1233 | } |
| 1234 | |
| 1235 | default: |
| 1236 | return -ENOIOCTLCMD; |
| 1237 | } |
| 1238 | |
| 1239 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1241 | EXPORT_SYMBOL(udp_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1243 | /* |
| 1244 | * This should be easy, if there is something there we |
| 1245 | * return it, otherwise we block. |
| 1246 | */ |
| 1247 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1248 | int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock, |
| 1249 | int flags, int *addr_len) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1250 | { |
| 1251 | struct inet_sock *inet = inet_sk(sk); |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 1252 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1253 | struct sk_buff *skb; |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1254 | unsigned int ulen, copied; |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 1255 | int peeked, peeking, off; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1256 | int err; |
| 1257 | int is_udplite = IS_UDPLITE(sk); |
Eric Dumazet | 197c949 | 2015-12-30 08:51:12 -0500 | [diff] [blame] | 1258 | bool checksum_valid = false; |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1259 | bool slow; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1260 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1261 | if (flags & MSG_ERRQUEUE) |
Hannes Frederic Sowa | 85fbaa7 | 2013-11-23 00:46:12 +0100 | [diff] [blame] | 1262 | return ip_recv_error(sk, msg, len, addr_len); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1263 | |
| 1264 | try_again: |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 1265 | peeking = off = sk_peek_offset(sk, flags); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1266 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
Pavel Emelyanov | 3f518bf | 2012-02-21 07:30:58 +0000 | [diff] [blame] | 1267 | &peeked, &off, &err); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1268 | if (!skb) |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 1269 | return err; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1270 | |
samanthakumar | e6afc8a | 2016-04-05 12:41:15 -0400 | [diff] [blame] | 1271 | ulen = skb->len; |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1272 | copied = len; |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 1273 | if (copied > ulen - off) |
| 1274 | copied = ulen - off; |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1275 | else if (copied < ulen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1276 | msg->msg_flags |= MSG_TRUNC; |
| 1277 | |
| 1278 | /* |
| 1279 | * If checksum is needed at all, try to do it while copying the |
| 1280 | * data. If the data is truncated, or if we only want a partial |
| 1281 | * coverage checksum (UDP-Lite), do it before the copy. |
| 1282 | */ |
| 1283 | |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 1284 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) { |
Eric Dumazet | 197c949 | 2015-12-30 08:51:12 -0500 | [diff] [blame] | 1285 | checksum_valid = !udp_lib_checksum_complete(skb); |
| 1286 | if (!checksum_valid) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1287 | goto csum_copy_err; |
| 1288 | } |
| 1289 | |
Eric Dumazet | 197c949 | 2015-12-30 08:51:12 -0500 | [diff] [blame] | 1290 | if (checksum_valid || skb_csum_unnecessary(skb)) |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 1291 | err = skb_copy_datagram_msg(skb, off, msg, copied); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1292 | else { |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 1293 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1294 | |
| 1295 | if (err == -EINVAL) |
| 1296 | goto csum_copy_err; |
| 1297 | } |
| 1298 | |
Eric Dumazet | 22911fc | 2012-06-27 00:23:44 +0000 | [diff] [blame] | 1299 | if (unlikely(err)) { |
| 1300 | trace_kfree_skb(skb, udp_recvmsg); |
Eric Dumazet | 979402b | 2012-09-05 23:34:44 +0000 | [diff] [blame] | 1301 | if (!peeked) { |
| 1302 | atomic_inc(&sk->sk_drops); |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 1303 | UDP_INC_STATS(sock_net(sk), |
| 1304 | UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 979402b | 2012-09-05 23:34:44 +0000 | [diff] [blame] | 1305 | } |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 1306 | skb_free_datagram_locked(sk, skb); |
| 1307 | return err; |
Eric Dumazet | 22911fc | 2012-06-27 00:23:44 +0000 | [diff] [blame] | 1308 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1309 | |
| 1310 | if (!peeked) |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 1311 | UDP_INC_STATS(sock_net(sk), |
| 1312 | UDP_MIB_INDATAGRAMS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1313 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1314 | sock_recv_ts_and_drops(msg, sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1315 | |
| 1316 | /* Copy the address. */ |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1317 | if (sin) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1318 | sin->sin_family = AF_INET; |
| 1319 | sin->sin_port = udp_hdr(skb)->source; |
| 1320 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| 1321 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
Hannes Frederic Sowa | bceaa90 | 2013-11-18 04:20:45 +0100 | [diff] [blame] | 1322 | *addr_len = sizeof(*sin); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1323 | } |
| 1324 | if (inet->cmsg_flags) |
Eric Dumazet | 10df8e6 | 2016-10-23 18:03:06 -0700 | [diff] [blame] | 1325 | ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr), off); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1326 | |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1327 | err = copied; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1328 | if (flags & MSG_TRUNC) |
| 1329 | err = ulen; |
| 1330 | |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 1331 | __skb_free_datagram_locked(sk, skb, peeking ? -err : err); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1332 | return err; |
| 1333 | |
| 1334 | csum_copy_err: |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1335 | slow = lock_sock_fast(sk); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1336 | if (!skb_kill_datagram(sk, skb, flags)) { |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 1337 | UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
| 1338 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1339 | } |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1340 | unlock_sock_fast(sk, slow); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1341 | |
Eric Dumazet | beb39db | 2015-05-30 09:16:53 -0700 | [diff] [blame] | 1342 | /* starting over for a new packet, but check if we need to yield */ |
| 1343 | cond_resched(); |
Xufeng Zhang | 9cfaa8d | 2011-06-21 10:43:40 +0000 | [diff] [blame] | 1344 | msg->msg_flags &= ~MSG_TRUNC; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1345 | goto try_again; |
| 1346 | } |
| 1347 | |
Eric Dumazet | 286c72d | 2016-10-20 09:39:40 -0700 | [diff] [blame] | 1348 | int __udp_disconnect(struct sock *sk, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | { |
| 1350 | struct inet_sock *inet = inet_sk(sk); |
| 1351 | /* |
| 1352 | * 1003.1g - break association. |
| 1353 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | sk->sk_state = TCP_CLOSE; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1356 | inet->inet_daddr = 0; |
| 1357 | inet->inet_dport = 0; |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1358 | sock_rps_reset_rxhash(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | sk->sk_bound_dev_if = 0; |
| 1360 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 1361 | inet_reset_saddr(sk); |
| 1362 | |
| 1363 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { |
| 1364 | sk->sk_prot->unhash(sk); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1365 | inet->inet_sport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | } |
| 1367 | sk_dst_reset(sk); |
| 1368 | return 0; |
| 1369 | } |
Eric Dumazet | 286c72d | 2016-10-20 09:39:40 -0700 | [diff] [blame] | 1370 | EXPORT_SYMBOL(__udp_disconnect); |
| 1371 | |
| 1372 | int udp_disconnect(struct sock *sk, int flags) |
| 1373 | { |
| 1374 | lock_sock(sk); |
| 1375 | __udp_disconnect(sk, flags); |
| 1376 | release_sock(sk); |
| 1377 | return 0; |
| 1378 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1379 | EXPORT_SYMBOL(udp_disconnect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1381 | void udp_lib_unhash(struct sock *sk) |
| 1382 | { |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1383 | if (sk_hashed(sk)) { |
| 1384 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 1385 | struct udp_hslot *hslot, *hslot2; |
| 1386 | |
| 1387 | hslot = udp_hashslot(udptable, sock_net(sk), |
| 1388 | udp_sk(sk)->udp_port_hash); |
| 1389 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1390 | |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1391 | spin_lock_bh(&hslot->lock); |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1392 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
| 1393 | reuseport_detach_sock(sk); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1394 | if (sk_del_node_init_rcu(sk)) { |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 1395 | hslot->count--; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1396 | inet_sk(sk)->inet_num = 0; |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1397 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 1398 | |
| 1399 | spin_lock(&hslot2->lock); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1400 | hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 1401 | hslot2->count--; |
| 1402 | spin_unlock(&hslot2->lock); |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1403 | } |
| 1404 | spin_unlock_bh(&hslot->lock); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1405 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1406 | } |
| 1407 | EXPORT_SYMBOL(udp_lib_unhash); |
| 1408 | |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1409 | /* |
| 1410 | * inet_rcv_saddr was changed, we must rehash secondary hash |
| 1411 | */ |
| 1412 | void udp_lib_rehash(struct sock *sk, u16 newhash) |
| 1413 | { |
| 1414 | if (sk_hashed(sk)) { |
| 1415 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
| 1416 | struct udp_hslot *hslot, *hslot2, *nhslot2; |
| 1417 | |
| 1418 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
| 1419 | nhslot2 = udp_hashslot2(udptable, newhash); |
| 1420 | udp_sk(sk)->udp_portaddr_hash = newhash; |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1421 | |
| 1422 | if (hslot2 != nhslot2 || |
| 1423 | rcu_access_pointer(sk->sk_reuseport_cb)) { |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1424 | hslot = udp_hashslot(udptable, sock_net(sk), |
| 1425 | udp_sk(sk)->udp_port_hash); |
| 1426 | /* we must lock primary chain too */ |
| 1427 | spin_lock_bh(&hslot->lock); |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1428 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
| 1429 | reuseport_detach_sock(sk); |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1430 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1431 | if (hslot2 != nhslot2) { |
| 1432 | spin_lock(&hslot2->lock); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1433 | hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1434 | hslot2->count--; |
| 1435 | spin_unlock(&hslot2->lock); |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1436 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1437 | spin_lock(&nhslot2->lock); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1438 | hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1439 | &nhslot2->head); |
| 1440 | nhslot2->count++; |
| 1441 | spin_unlock(&nhslot2->lock); |
| 1442 | } |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1443 | |
| 1444 | spin_unlock_bh(&hslot->lock); |
| 1445 | } |
| 1446 | } |
| 1447 | } |
| 1448 | EXPORT_SYMBOL(udp_lib_rehash); |
| 1449 | |
| 1450 | static void udp_v4_rehash(struct sock *sk) |
| 1451 | { |
| 1452 | u16 new_hash = udp4_portaddr_hash(sock_net(sk), |
| 1453 | inet_sk(sk)->inet_rcv_saddr, |
| 1454 | inet_sk(sk)->inet_num); |
| 1455 | udp_lib_rehash(sk, new_hash); |
| 1456 | } |
| 1457 | |
Eric Dumazet | 30c7be2 | 2016-11-22 09:06:45 -0800 | [diff] [blame] | 1458 | int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1459 | { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 1460 | int rc; |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1461 | |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 1462 | if (inet_sk(sk)->inet_daddr) { |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1463 | sock_rps_save_rxhash(sk, skb); |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 1464 | sk_mark_napi_id(sk, skb); |
Eric Dumazet | 2c8c56e | 2014-11-11 05:54:28 -0800 | [diff] [blame] | 1465 | sk_incoming_cpu_update(sk); |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 1466 | } |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 1467 | |
samanthakumar | e6afc8a | 2016-04-05 12:41:15 -0400 | [diff] [blame] | 1468 | rc = __sock_queue_rcv_skb(sk, skb); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1469 | if (rc < 0) { |
| 1470 | int is_udplite = IS_UDPLITE(sk); |
| 1471 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1472 | /* Note that an ENOMEM error is charged twice */ |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1473 | if (rc == -ENOMEM) |
Eric Dumazet | e61da9e | 2016-04-29 14:16:50 -0700 | [diff] [blame] | 1474 | UDP_INC_STATS(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1475 | is_udplite); |
Eric Dumazet | e61da9e | 2016-04-29 14:16:50 -0700 | [diff] [blame] | 1476 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1477 | kfree_skb(skb); |
Satoru Moriya | 296f7ea | 2011-06-17 11:58:39 +0000 | [diff] [blame] | 1478 | trace_udp_fail_queue_rcv_skb(rc, sk); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1479 | return -1; |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1480 | } |
| 1481 | |
| 1482 | return 0; |
| 1483 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1484 | } |
| 1485 | |
Eric Dumazet | 447167b | 2012-04-11 23:05:28 +0000 | [diff] [blame] | 1486 | static struct static_key udp_encap_needed __read_mostly; |
| 1487 | void udp_encap_enable(void) |
| 1488 | { |
| 1489 | if (!static_key_enabled(&udp_encap_needed)) |
| 1490 | static_key_slow_inc(&udp_encap_needed); |
| 1491 | } |
| 1492 | EXPORT_SYMBOL(udp_encap_enable); |
| 1493 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1494 | /* returns: |
| 1495 | * -1: error |
| 1496 | * 0: success |
| 1497 | * >0: "udp encap" protocol resubmission |
| 1498 | * |
| 1499 | * Note that in the success and error cases, the skb is assumed to |
| 1500 | * have either been requeued or freed. |
| 1501 | */ |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1502 | int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1503 | { |
| 1504 | struct udp_sock *up = udp_sk(sk); |
| 1505 | int rc; |
| 1506 | int is_udplite = IS_UDPLITE(sk); |
| 1507 | |
| 1508 | /* |
| 1509 | * Charge it to the socket, dropping if the queue is full. |
| 1510 | */ |
| 1511 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1512 | goto drop; |
| 1513 | nf_reset(skb); |
| 1514 | |
Eric Dumazet | 447167b | 2012-04-11 23:05:28 +0000 | [diff] [blame] | 1515 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
Eric Dumazet | 0ad92ad | 2011-11-01 12:56:59 +0000 | [diff] [blame] | 1516 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
| 1517 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1518 | /* |
| 1519 | * This is an encapsulation socket so pass the skb to |
| 1520 | * the socket's udp_encap_rcv() hook. Otherwise, just |
| 1521 | * fall through and pass this up the UDP socket. |
| 1522 | * up->encap_rcv() returns the following value: |
| 1523 | * =0 if skb was successfully passed to the encap |
| 1524 | * handler or was discarded by it. |
| 1525 | * >0 if skb should be passed on to UDP. |
| 1526 | * <0 if skb should be resubmitted as proto -N |
| 1527 | */ |
| 1528 | |
| 1529 | /* if we're overly short, let UDP handle it */ |
Eric Dumazet | 0ad92ad | 2011-11-01 12:56:59 +0000 | [diff] [blame] | 1530 | encap_rcv = ACCESS_ONCE(up->encap_rcv); |
Hannes Frederic Sowa | e5aed00 | 2016-05-19 15:58:33 +0200 | [diff] [blame] | 1531 | if (encap_rcv) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1532 | int ret; |
| 1533 | |
Tom Herbert | 0a80966 | 2014-05-07 16:52:39 -0700 | [diff] [blame] | 1534 | /* Verify checksum before giving to encap */ |
| 1535 | if (udp_lib_checksum_complete(skb)) |
| 1536 | goto csum_error; |
| 1537 | |
Eric Dumazet | 0ad92ad | 2011-11-01 12:56:59 +0000 | [diff] [blame] | 1538 | ret = encap_rcv(sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1539 | if (ret <= 0) { |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1540 | __UDP_INC_STATS(sock_net(sk), |
| 1541 | UDP_MIB_INDATAGRAMS, |
| 1542 | is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1543 | return -ret; |
| 1544 | } |
| 1545 | } |
| 1546 | |
| 1547 | /* FALLTHROUGH -- it's a UDP Packet */ |
| 1548 | } |
| 1549 | |
| 1550 | /* |
| 1551 | * UDP-Lite specific tests, ignored on UDP sockets |
| 1552 | */ |
| 1553 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
| 1554 | |
| 1555 | /* |
| 1556 | * MIB statistics other than incrementing the error count are |
| 1557 | * disabled for the following two types of errors: these depend |
| 1558 | * on the application settings, not on the functioning of the |
| 1559 | * protocol stack as such. |
| 1560 | * |
| 1561 | * RFC 3828 here recommends (sec 3.3): "There should also be a |
| 1562 | * way ... to ... at least let the receiving application block |
| 1563 | * delivery of packets with coverage values less than a value |
| 1564 | * provided by the application." |
| 1565 | */ |
| 1566 | if (up->pcrlen == 0) { /* full coverage was set */ |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1567 | net_dbg_ratelimited("UDPLite: partial coverage %d while full coverage %d requested\n", |
| 1568 | UDP_SKB_CB(skb)->cscov, skb->len); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1569 | goto drop; |
| 1570 | } |
| 1571 | /* The next case involves violating the min. coverage requested |
| 1572 | * by the receiver. This is subtle: if receiver wants x and x is |
| 1573 | * greater than the buffersize/MTU then receiver will complain |
| 1574 | * that it wants x while sender emits packets of smaller size y. |
| 1575 | * Therefore the above ...()->partial_cov statement is essential. |
| 1576 | */ |
| 1577 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1578 | net_dbg_ratelimited("UDPLite: coverage %d too small, need min %d\n", |
| 1579 | UDP_SKB_CB(skb)->cscov, up->pcrlen); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1580 | goto drop; |
| 1581 | } |
| 1582 | } |
| 1583 | |
Eric Dumazet | ce25d66 | 2016-06-02 14:52:43 -0700 | [diff] [blame] | 1584 | if (rcu_access_pointer(sk->sk_filter) && |
| 1585 | udp_lib_checksum_complete(skb)) |
samanthakumar | e6afc8a | 2016-04-05 12:41:15 -0400 | [diff] [blame] | 1586 | goto csum_error; |
Eric Dumazet | ce25d66 | 2016-06-02 14:52:43 -0700 | [diff] [blame] | 1587 | |
Daniel Borkmann | ba66bbe | 2016-07-25 18:06:12 +0200 | [diff] [blame] | 1588 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) |
Michal Kubeček | a612769 | 2016-07-08 17:52:33 +0200 | [diff] [blame] | 1589 | goto drop; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1590 | |
samanthakumar | e6afc8a | 2016-04-05 12:41:15 -0400 | [diff] [blame] | 1591 | udp_csum_pull_header(skb); |
Sorin Dumitru | 274f482 | 2014-07-22 21:16:51 +0300 | [diff] [blame] | 1592 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1593 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
| 1594 | is_udplite); |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 1595 | goto drop; |
James M Leddy | 3e215c8 | 2014-06-25 17:38:13 -0400 | [diff] [blame] | 1596 | } |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 1597 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1598 | rc = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1599 | |
Shawn Bohrer | fbf8866 | 2013-10-07 11:01:40 -0500 | [diff] [blame] | 1600 | ipv4_pktinfo_prepare(sk, skb); |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1601 | bh_lock_sock(sk); |
| 1602 | if (!sock_owned_by_user(sk)) |
| 1603 | rc = __udp_queue_rcv_skb(sk, skb); |
Eric Dumazet | f545a38 | 2012-04-22 23:34:26 +0000 | [diff] [blame] | 1604 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
Zhu Yi | 5534979 | 2010-03-04 18:01:42 +0000 | [diff] [blame] | 1605 | bh_unlock_sock(sk); |
| 1606 | goto drop; |
| 1607 | } |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1608 | bh_unlock_sock(sk); |
| 1609 | |
| 1610 | return rc; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1611 | |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1612 | csum_error: |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1613 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1614 | drop: |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1615 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 8edf19c | 2009-10-15 00:12:40 +0000 | [diff] [blame] | 1616 | atomic_inc(&sk->sk_drops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1617 | kfree_skb(skb); |
| 1618 | return -1; |
| 1619 | } |
| 1620 | |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1621 | /* For TCP sockets, sk_rx_dst is protected by socket lock |
Eric Dumazet | e47eb5d | 2013-12-15 10:53:46 -0800 | [diff] [blame] | 1622 | * For UDP, we use xchg() to guard against concurrent changes. |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1623 | */ |
| 1624 | static void udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1625 | { |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1626 | struct dst_entry *old; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1627 | |
Eric Dumazet | e47eb5d | 2013-12-15 10:53:46 -0800 | [diff] [blame] | 1628 | dst_hold(dst); |
| 1629 | old = xchg(&sk->sk_rx_dst, dst); |
| 1630 | dst_release(old); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1631 | } |
| 1632 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1633 | /* |
| 1634 | * Multicasts and broadcasts go to each listener. |
| 1635 | * |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1636 | * Note: called only from the BH handler context. |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1637 | */ |
Pavel Emelyanov | e316349 | 2008-06-16 17:12:11 -0700 | [diff] [blame] | 1638 | static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1639 | struct udphdr *uh, |
| 1640 | __be32 saddr, __be32 daddr, |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1641 | struct udp_table *udptable, |
| 1642 | int proto) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1643 | { |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1644 | struct sock *sk, *first = NULL; |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 1645 | unsigned short hnum = ntohs(uh->dest); |
| 1646 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1647 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1648 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
| 1649 | int dif = skb->dev->ifindex; |
| 1650 | struct hlist_node *node; |
| 1651 | struct sk_buff *nskb; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1652 | |
| 1653 | if (use_hash2) { |
| 1654 | hash2_any = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum) & |
Pablo Neira | 73e2d5e | 2016-11-14 23:40:30 +0100 | [diff] [blame] | 1655 | udptable->mask; |
| 1656 | hash2 = udp4_portaddr_hash(net, daddr, hnum) & udptable->mask; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1657 | start_lookup: |
Pablo Neira | 73e2d5e | 2016-11-14 23:40:30 +0100 | [diff] [blame] | 1658 | hslot = &udptable->hash2[hash2]; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1659 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
| 1660 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1661 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1662 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
| 1663 | if (!__udp_is_mcast_sock(net, sk, uh->dest, daddr, |
| 1664 | uh->source, saddr, dif, hnum)) |
| 1665 | continue; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1666 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1667 | if (!first) { |
| 1668 | first = sk; |
| 1669 | continue; |
| 1670 | } |
| 1671 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 1672 | |
| 1673 | if (unlikely(!nskb)) { |
| 1674 | atomic_inc(&sk->sk_drops); |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1675 | __UDP_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
| 1676 | IS_UDPLITE(sk)); |
| 1677 | __UDP_INC_STATS(net, UDP_MIB_INERRORS, |
| 1678 | IS_UDPLITE(sk)); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1679 | continue; |
| 1680 | } |
| 1681 | if (udp_queue_rcv_skb(sk, nskb) > 0) |
| 1682 | consume_skb(nskb); |
| 1683 | } |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1684 | |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1685 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
| 1686 | if (use_hash2 && hash2 != hash2_any) { |
| 1687 | hash2 = hash2_any; |
| 1688 | goto start_lookup; |
| 1689 | } |
| 1690 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1691 | if (first) { |
| 1692 | if (udp_queue_rcv_skb(first, skb) > 0) |
| 1693 | consume_skb(skb); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1694 | } else { |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1695 | kfree_skb(skb); |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1696 | __UDP_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
| 1697 | proto == IPPROTO_UDPLITE); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1698 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1699 | return 0; |
| 1700 | } |
| 1701 | |
| 1702 | /* Initialize UDP checksum. If exited with zero value (success), |
| 1703 | * CHECKSUM_UNNECESSARY means, that no more checks are required. |
| 1704 | * Otherwise, csum completion requires chacksumming packet body, |
| 1705 | * including udp header and folding it to skb->csum. |
| 1706 | */ |
| 1707 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, |
| 1708 | int proto) |
| 1709 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1710 | int err; |
| 1711 | |
| 1712 | UDP_SKB_CB(skb)->partial_cov = 0; |
| 1713 | UDP_SKB_CB(skb)->cscov = skb->len; |
| 1714 | |
| 1715 | if (proto == IPPROTO_UDPLITE) { |
| 1716 | err = udplite_checksum_init(skb, uh); |
| 1717 | if (err) |
| 1718 | return err; |
Alexey Kodanev | 5984901 | 2018-02-15 20:18:43 +0300 | [diff] [blame] | 1719 | |
| 1720 | if (UDP_SKB_CB(skb)->partial_cov) { |
| 1721 | skb->csum = inet_compute_pseudo(skb, proto); |
| 1722 | return 0; |
| 1723 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1724 | } |
| 1725 | |
Hannes Frederic Sowa | b46d9f6 | 2016-06-12 12:02:46 +0200 | [diff] [blame] | 1726 | /* Note, we are only interested in != 0 or == 0, thus the |
| 1727 | * force to int. |
| 1728 | */ |
| 1729 | return (__force int)skb_checksum_init_zero_check(skb, proto, uh->check, |
| 1730 | inet_compute_pseudo); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1731 | } |
| 1732 | |
| 1733 | /* |
| 1734 | * All we need to do is get the socket, and then do a checksum. |
| 1735 | */ |
| 1736 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1737 | int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1738 | int proto) |
| 1739 | { |
| 1740 | struct sock *sk; |
Jesper Dangaard Brouer | 7b5e56f | 2009-02-05 15:05:45 -0800 | [diff] [blame] | 1741 | struct udphdr *uh; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1742 | unsigned short ulen; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1743 | struct rtable *rt = skb_rtable(skb); |
Jesper Dangaard Brouer | 2783ef2 | 2009-02-06 01:59:12 -0800 | [diff] [blame] | 1744 | __be32 saddr, daddr; |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1745 | struct net *net = dev_net(skb->dev); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1746 | |
| 1747 | /* |
| 1748 | * Validate the packet. |
| 1749 | */ |
| 1750 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
| 1751 | goto drop; /* No space for header. */ |
| 1752 | |
Jesper Dangaard Brouer | 7b5e56f | 2009-02-05 15:05:45 -0800 | [diff] [blame] | 1753 | uh = udp_hdr(skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1754 | ulen = ntohs(uh->len); |
Bjørn Mork | ccc2d97 | 2010-05-06 03:44:34 +0000 | [diff] [blame] | 1755 | saddr = ip_hdr(skb)->saddr; |
| 1756 | daddr = ip_hdr(skb)->daddr; |
| 1757 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1758 | if (ulen > skb->len) |
| 1759 | goto short_packet; |
| 1760 | |
| 1761 | if (proto == IPPROTO_UDP) { |
| 1762 | /* UDP validates ulen. */ |
| 1763 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) |
| 1764 | goto short_packet; |
| 1765 | uh = udp_hdr(skb); |
| 1766 | } |
| 1767 | |
| 1768 | if (udp4_csum_init(skb, uh, proto)) |
| 1769 | goto csum_error; |
| 1770 | |
Eric Dumazet | 8afdd99 | 2013-12-10 18:07:23 -0800 | [diff] [blame] | 1771 | sk = skb_steal_sock(skb); |
| 1772 | if (sk) { |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1773 | struct dst_entry *dst = skb_dst(skb); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1774 | int ret; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1775 | |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1776 | if (unlikely(sk->sk_rx_dst != dst)) |
| 1777 | udp_sk_rx_dst_set(sk, dst); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1778 | |
| 1779 | ret = udp_queue_rcv_skb(sk, skb); |
Eric Dumazet | 8afdd99 | 2013-12-10 18:07:23 -0800 | [diff] [blame] | 1780 | sock_put(sk); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1781 | /* a return value > 0 means to resubmit the input, but |
| 1782 | * it wants the return to be -protocol, or 0 |
| 1783 | */ |
| 1784 | if (ret > 0) |
| 1785 | return -ret; |
| 1786 | return 0; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1787 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1788 | |
Fabian Frederick | c18450a | 2014-11-04 20:48:41 +0100 | [diff] [blame] | 1789 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) |
| 1790 | return __udp4_lib_mcast_deliver(net, skb, uh, |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1791 | saddr, daddr, udptable, proto); |
Fabian Frederick | c18450a | 2014-11-04 20:48:41 +0100 | [diff] [blame] | 1792 | |
| 1793 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1794 | if (sk) { |
Eliezer Tamir | a5b5047 | 2013-06-10 11:40:00 +0300 | [diff] [blame] | 1795 | int ret; |
| 1796 | |
Tom Herbert | 224d019 | 2015-01-05 13:56:14 -0800 | [diff] [blame] | 1797 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 1798 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
| 1799 | inet_compute_pseudo); |
| 1800 | |
Eliezer Tamir | a5b5047 | 2013-06-10 11:40:00 +0300 | [diff] [blame] | 1801 | ret = udp_queue_rcv_skb(sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1802 | |
| 1803 | /* a return value > 0 means to resubmit the input, but |
| 1804 | * it wants the return to be -protocol, or 0 |
| 1805 | */ |
| 1806 | if (ret > 0) |
| 1807 | return -ret; |
| 1808 | return 0; |
| 1809 | } |
| 1810 | |
| 1811 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1812 | goto drop; |
| 1813 | nf_reset(skb); |
| 1814 | |
| 1815 | /* No socket. Drop packet silently, if checksum is wrong */ |
| 1816 | if (udp_lib_checksum_complete(skb)) |
| 1817 | goto csum_error; |
| 1818 | |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1819 | __UDP_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1820 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
| 1821 | |
| 1822 | /* |
| 1823 | * Hmm. We got an UDP packet to a port to which we |
| 1824 | * don't wanna listen. Ignore it. |
| 1825 | */ |
| 1826 | kfree_skb(skb); |
| 1827 | return 0; |
| 1828 | |
| 1829 | short_packet: |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1830 | net_dbg_ratelimited("UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
| 1831 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
| 1832 | &saddr, ntohs(uh->source), |
| 1833 | ulen, skb->len, |
| 1834 | &daddr, ntohs(uh->dest)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1835 | goto drop; |
| 1836 | |
| 1837 | csum_error: |
| 1838 | /* |
| 1839 | * RFC1122: OK. Discards the bad packet silently (as far as |
| 1840 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). |
| 1841 | */ |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1842 | net_dbg_ratelimited("UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
| 1843 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
| 1844 | &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest), |
| 1845 | ulen); |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1846 | __UDP_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1847 | drop: |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 1848 | __UDP_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1849 | kfree_skb(skb); |
| 1850 | return 0; |
| 1851 | } |
| 1852 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1853 | /* We can only early demux multicast if there is a single matching socket. |
| 1854 | * If more than one socket found returns NULL |
| 1855 | */ |
| 1856 | static struct sock *__udp4_lib_mcast_demux_lookup(struct net *net, |
| 1857 | __be16 loc_port, __be32 loc_addr, |
| 1858 | __be16 rmt_port, __be32 rmt_addr, |
| 1859 | int dif) |
| 1860 | { |
| 1861 | struct sock *sk, *result; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1862 | unsigned short hnum = ntohs(loc_port); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1863 | unsigned int slot = udp_hashfn(net, hnum, udp_table.mask); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1864 | struct udp_hslot *hslot = &udp_table.hash[slot]; |
| 1865 | |
Eric Dumazet | 63c6f81 | 2014-06-12 16:13:06 -0700 | [diff] [blame] | 1866 | /* Do not bother scanning a too big list */ |
| 1867 | if (hslot->count > 10) |
| 1868 | return NULL; |
| 1869 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1870 | result = NULL; |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1871 | sk_for_each_rcu(sk, &hslot->head) { |
| 1872 | if (__udp_is_mcast_sock(net, sk, loc_port, loc_addr, |
| 1873 | rmt_port, rmt_addr, dif, hnum)) { |
| 1874 | if (result) |
| 1875 | return NULL; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1876 | result = sk; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1877 | } |
| 1878 | } |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1879 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1880 | return result; |
| 1881 | } |
| 1882 | |
| 1883 | /* For unicast we should only early demux connected sockets or we can |
| 1884 | * break forwarding setups. The chains here can be long so only check |
| 1885 | * if the first socket is an exact match and if not move on. |
| 1886 | */ |
| 1887 | static struct sock *__udp4_lib_demux_lookup(struct net *net, |
| 1888 | __be16 loc_port, __be32 loc_addr, |
| 1889 | __be16 rmt_port, __be32 rmt_addr, |
| 1890 | int dif) |
| 1891 | { |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1892 | unsigned short hnum = ntohs(loc_port); |
| 1893 | unsigned int hash2 = udp4_portaddr_hash(net, loc_addr, hnum); |
| 1894 | unsigned int slot2 = hash2 & udp_table.mask; |
| 1895 | struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; |
Joe Perches | c722831 | 2014-05-13 20:30:07 -0700 | [diff] [blame] | 1896 | INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1897 | const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1898 | struct sock *sk; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1899 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1900 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
| 1901 | if (INET_MATCH(sk, net, acookie, rmt_addr, |
| 1902 | loc_addr, ports, dif)) |
| 1903 | return sk; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1904 | /* Only check first socket in chain */ |
| 1905 | break; |
| 1906 | } |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1907 | return NULL; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1908 | } |
| 1909 | |
| 1910 | void udp_v4_early_demux(struct sk_buff *skb) |
| 1911 | { |
Eric Dumazet | 610438b | 2013-12-11 08:10:05 -0800 | [diff] [blame] | 1912 | struct net *net = dev_net(skb->dev); |
| 1913 | const struct iphdr *iph; |
| 1914 | const struct udphdr *uh; |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1915 | struct sock *sk = NULL; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1916 | struct dst_entry *dst; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1917 | int dif = skb->dev->ifindex; |
Shawn Bohrer | 6e54030 | 2015-06-03 16:27:38 -0500 | [diff] [blame] | 1918 | int ours; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1919 | |
| 1920 | /* validate the packet */ |
| 1921 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct udphdr))) |
| 1922 | return; |
| 1923 | |
Eric Dumazet | 610438b | 2013-12-11 08:10:05 -0800 | [diff] [blame] | 1924 | iph = ip_hdr(skb); |
| 1925 | uh = udp_hdr(skb); |
| 1926 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1927 | if (skb->pkt_type == PACKET_BROADCAST || |
Shawn Bohrer | 6e54030 | 2015-06-03 16:27:38 -0500 | [diff] [blame] | 1928 | skb->pkt_type == PACKET_MULTICAST) { |
| 1929 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
| 1930 | |
| 1931 | if (!in_dev) |
| 1932 | return; |
| 1933 | |
Paolo Abeni | ad0ea19 | 2016-03-22 09:19:38 +0100 | [diff] [blame] | 1934 | /* we are supposed to accept bcast packets */ |
| 1935 | if (skb->pkt_type == PACKET_MULTICAST) { |
| 1936 | ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr, |
| 1937 | iph->protocol); |
| 1938 | if (!ours) |
| 1939 | return; |
| 1940 | } |
| 1941 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1942 | sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr, |
| 1943 | uh->source, iph->saddr, dif); |
Shawn Bohrer | 6e54030 | 2015-06-03 16:27:38 -0500 | [diff] [blame] | 1944 | } else if (skb->pkt_type == PACKET_HOST) { |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1945 | sk = __udp4_lib_demux_lookup(net, uh->dest, iph->daddr, |
| 1946 | uh->source, iph->saddr, dif); |
Shawn Bohrer | 6e54030 | 2015-06-03 16:27:38 -0500 | [diff] [blame] | 1947 | } |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1948 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 1949 | if (!sk || !atomic_inc_not_zero_hint(&sk->sk_refcnt, 2)) |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1950 | return; |
| 1951 | |
| 1952 | skb->sk = sk; |
Alexander Duyck | 82eabd9 | 2014-09-04 13:32:11 -0400 | [diff] [blame] | 1953 | skb->destructor = sock_efree; |
Eric Dumazet | 10e2eb8 | 2015-08-01 12:14:33 +0200 | [diff] [blame] | 1954 | dst = READ_ONCE(sk->sk_rx_dst); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1955 | |
| 1956 | if (dst) |
| 1957 | dst = dst_check(dst, 0); |
Eric Dumazet | 10e2eb8 | 2015-08-01 12:14:33 +0200 | [diff] [blame] | 1958 | if (dst) { |
| 1959 | /* DST_NOCACHE can not be used without taking a reference */ |
| 1960 | if (dst->flags & DST_NOCACHE) { |
| 1961 | if (likely(atomic_inc_not_zero(&dst->__refcnt))) |
| 1962 | skb_dst_set(skb, dst); |
| 1963 | } else { |
| 1964 | skb_dst_set_noref(skb, dst); |
| 1965 | } |
| 1966 | } |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1967 | } |
| 1968 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1969 | int udp_rcv(struct sk_buff *skb) |
| 1970 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1971 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1972 | } |
| 1973 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1974 | void udp_destroy_sock(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1975 | { |
Tom Parkin | 44046a5 | 2013-03-19 06:11:12 +0000 | [diff] [blame] | 1976 | struct udp_sock *up = udp_sk(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1977 | bool slow = lock_sock_fast(sk); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1978 | udp_flush_pending_frames(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1979 | unlock_sock_fast(sk, slow); |
Tom Parkin | 44046a5 | 2013-03-19 06:11:12 +0000 | [diff] [blame] | 1980 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
| 1981 | void (*encap_destroy)(struct sock *sk); |
| 1982 | encap_destroy = ACCESS_ONCE(up->encap_destroy); |
| 1983 | if (encap_destroy) |
| 1984 | encap_destroy(sk); |
| 1985 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1986 | } |
| 1987 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1988 | /* |
| 1989 | * Socket option code for UDP |
| 1990 | */ |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1991 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1992 | char __user *optval, unsigned int optlen, |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1993 | int (*push_pending_frames)(struct sock *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | { |
| 1995 | struct udp_sock *up = udp_sk(sk); |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 1996 | int val, valbool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | int err = 0; |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 1998 | int is_udplite = IS_UDPLITE(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2000 | if (optlen < sizeof(int)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | return -EINVAL; |
| 2002 | |
| 2003 | if (get_user(val, (int __user *)optval)) |
| 2004 | return -EFAULT; |
| 2005 | |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2006 | valbool = val ? 1 : 0; |
| 2007 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2008 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | case UDP_CORK: |
| 2010 | if (val != 0) { |
| 2011 | up->corkflag = 1; |
| 2012 | } else { |
| 2013 | up->corkflag = 0; |
| 2014 | lock_sock(sk); |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 2015 | push_pending_frames(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | release_sock(sk); |
| 2017 | } |
| 2018 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2019 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | case UDP_ENCAP: |
| 2021 | switch (val) { |
| 2022 | case 0: |
| 2023 | case UDP_ENCAP_ESPINUDP: |
| 2024 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
James Chapman | 067b207 | 2007-07-05 17:08:05 -0700 | [diff] [blame] | 2025 | up->encap_rcv = xfrm4_udp_encap_rcv; |
| 2026 | /* FALLTHROUGH */ |
James Chapman | 342f023 | 2007-06-27 15:37:46 -0700 | [diff] [blame] | 2027 | case UDP_ENCAP_L2TPINUDP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | up->encap_type = val; |
Eric Dumazet | 447167b | 2012-04-11 23:05:28 +0000 | [diff] [blame] | 2029 | udp_encap_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | break; |
| 2031 | default: |
| 2032 | err = -ENOPROTOOPT; |
| 2033 | break; |
| 2034 | } |
| 2035 | break; |
| 2036 | |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2037 | case UDP_NO_CHECK6_TX: |
| 2038 | up->no_check6_tx = valbool; |
| 2039 | break; |
| 2040 | |
| 2041 | case UDP_NO_CHECK6_RX: |
| 2042 | up->no_check6_rx = valbool; |
| 2043 | break; |
| 2044 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2045 | /* |
| 2046 | * UDP-Lite's partial checksum coverage (RFC 3828). |
| 2047 | */ |
| 2048 | /* The sender sets actual checksum coverage length via this option. |
| 2049 | * The case coverage > packet length is handled by send module. */ |
| 2050 | case UDPLITE_SEND_CSCOV: |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 2051 | if (!is_udplite) /* Disable the option on UDP sockets */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2052 | return -ENOPROTOOPT; |
| 2053 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ |
| 2054 | val = 8; |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 2055 | else if (val > USHRT_MAX) |
| 2056 | val = USHRT_MAX; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2057 | up->pcslen = val; |
| 2058 | up->pcflag |= UDPLITE_SEND_CC; |
| 2059 | break; |
| 2060 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2061 | /* The receiver specifies a minimum checksum coverage value. To make |
| 2062 | * sense, this should be set to at least 8 (as done below). If zero is |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2063 | * used, this again means full checksum coverage. */ |
| 2064 | case UDPLITE_RECV_CSCOV: |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 2065 | if (!is_udplite) /* Disable the option on UDP sockets */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2066 | return -ENOPROTOOPT; |
| 2067 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ |
| 2068 | val = 8; |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 2069 | else if (val > USHRT_MAX) |
| 2070 | val = USHRT_MAX; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2071 | up->pcrlen = val; |
| 2072 | up->pcflag |= UDPLITE_RECV_CC; |
| 2073 | break; |
| 2074 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | default: |
| 2076 | err = -ENOPROTOOPT; |
| 2077 | break; |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2078 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2079 | |
| 2080 | return err; |
| 2081 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2082 | EXPORT_SYMBOL(udp_lib_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2084 | int udp_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2085 | char __user *optval, unsigned int optlen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2086 | { |
| 2087 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2088 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 2089 | udp_push_pending_frames); |
| 2090 | return ip_setsockopt(sk, level, optname, optval, optlen); |
| 2091 | } |
| 2092 | |
| 2093 | #ifdef CONFIG_COMPAT |
| 2094 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2095 | char __user *optval, unsigned int optlen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2096 | { |
| 2097 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2098 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 2099 | udp_push_pending_frames); |
| 2100 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
| 2101 | } |
| 2102 | #endif |
| 2103 | |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 2104 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
| 2105 | char __user *optval, int __user *optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | { |
| 2107 | struct udp_sock *up = udp_sk(sk); |
| 2108 | int val, len; |
| 2109 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2110 | if (get_user(len, optlen)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | return -EFAULT; |
| 2112 | |
| 2113 | len = min_t(unsigned int, len, sizeof(int)); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2114 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2115 | if (len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | return -EINVAL; |
| 2117 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2118 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | case UDP_CORK: |
| 2120 | val = up->corkflag; |
| 2121 | break; |
| 2122 | |
| 2123 | case UDP_ENCAP: |
| 2124 | val = up->encap_type; |
| 2125 | break; |
| 2126 | |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2127 | case UDP_NO_CHECK6_TX: |
| 2128 | val = up->no_check6_tx; |
| 2129 | break; |
| 2130 | |
| 2131 | case UDP_NO_CHECK6_RX: |
| 2132 | val = up->no_check6_rx; |
| 2133 | break; |
| 2134 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2135 | /* The following two cannot be changed on UDP sockets, the return is |
| 2136 | * always 0 (which corresponds to the full checksum coverage of UDP). */ |
| 2137 | case UDPLITE_SEND_CSCOV: |
| 2138 | val = up->pcslen; |
| 2139 | break; |
| 2140 | |
| 2141 | case UDPLITE_RECV_CSCOV: |
| 2142 | val = up->pcrlen; |
| 2143 | break; |
| 2144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2145 | default: |
| 2146 | return -ENOPROTOOPT; |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2147 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2149 | if (put_user(len, optlen)) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2150 | return -EFAULT; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2151 | if (copy_to_user(optval, &val, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | return -EFAULT; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2153 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2155 | EXPORT_SYMBOL(udp_lib_getsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2157 | int udp_getsockopt(struct sock *sk, int level, int optname, |
| 2158 | char __user *optval, int __user *optlen) |
| 2159 | { |
| 2160 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2161 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| 2162 | return ip_getsockopt(sk, level, optname, optval, optlen); |
| 2163 | } |
| 2164 | |
| 2165 | #ifdef CONFIG_COMPAT |
| 2166 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, |
| 2167 | char __user *optval, int __user *optlen) |
| 2168 | { |
| 2169 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2170 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| 2171 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
| 2172 | } |
| 2173 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | /** |
| 2175 | * udp_poll - wait for a UDP event. |
| 2176 | * @file - file struct |
| 2177 | * @sock - socket |
| 2178 | * @wait - poll table |
| 2179 | * |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2180 | * This is same as datagram poll, except for the special case of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | * blocking sockets. If application is using a blocking fd |
| 2182 | * and a packet with checksum error is in the queue; |
| 2183 | * then it could get return from select indicating data available |
| 2184 | * but then block when reading it. Add special case code |
| 2185 | * to work around these arguably broken applications. |
| 2186 | */ |
| 2187 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) |
| 2188 | { |
| 2189 | unsigned int mask = datagram_poll(file, sock, wait); |
| 2190 | struct sock *sk = sock->sk; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2191 | |
David Majnemer | c3f1dba | 2013-05-31 13:15:38 +0000 | [diff] [blame] | 2192 | sock_rps_record_flow(sk); |
| 2193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | /* Check for false positives due to checksum errors */ |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 2195 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
Eric Dumazet | e83c674 | 2016-08-23 13:59:33 -0700 | [diff] [blame] | 2196 | !(sk->sk_shutdown & RCV_SHUTDOWN) && first_packet_length(sk) == -1) |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 2197 | mask &= ~(POLLIN | POLLRDNORM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | |
| 2199 | return mask; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2202 | EXPORT_SYMBOL(udp_poll); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2203 | |
David Ahern | 5d77dca | 2016-08-23 21:06:33 -0700 | [diff] [blame] | 2204 | int udp_abort(struct sock *sk, int err) |
| 2205 | { |
| 2206 | lock_sock(sk); |
| 2207 | |
| 2208 | sk->sk_err = err; |
| 2209 | sk->sk_error_report(sk); |
Eric Dumazet | 286c72d | 2016-10-20 09:39:40 -0700 | [diff] [blame] | 2210 | __udp_disconnect(sk, 0); |
David Ahern | 5d77dca | 2016-08-23 21:06:33 -0700 | [diff] [blame] | 2211 | |
| 2212 | release_sock(sk); |
| 2213 | |
| 2214 | return 0; |
| 2215 | } |
| 2216 | EXPORT_SYMBOL_GPL(udp_abort); |
| 2217 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2218 | struct proto udp_prot = { |
| 2219 | .name = "UDP", |
| 2220 | .owner = THIS_MODULE, |
| 2221 | .close = udp_lib_close, |
| 2222 | .connect = ip4_datagram_connect, |
| 2223 | .disconnect = udp_disconnect, |
| 2224 | .ioctl = udp_ioctl, |
| 2225 | .destroy = udp_destroy_sock, |
| 2226 | .setsockopt = udp_setsockopt, |
| 2227 | .getsockopt = udp_getsockopt, |
| 2228 | .sendmsg = udp_sendmsg, |
| 2229 | .recvmsg = udp_recvmsg, |
| 2230 | .sendpage = udp_sendpage, |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 2231 | .backlog_rcv = __udp_queue_rcv_skb, |
Steffen Klassert | 8141ed9 | 2013-01-21 02:00:03 +0000 | [diff] [blame] | 2232 | .release_cb = ip4_datagram_release_cb, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2233 | .hash = udp_lib_hash, |
| 2234 | .unhash = udp_lib_unhash, |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 2235 | .rehash = udp_v4_rehash, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2236 | .get_port = udp_v4_get_port, |
| 2237 | .memory_allocated = &udp_memory_allocated, |
| 2238 | .sysctl_mem = sysctl_udp_mem, |
| 2239 | .sysctl_wmem = &sysctl_udp_wmem_min, |
| 2240 | .sysctl_rmem = &sysctl_udp_rmem_min, |
| 2241 | .obj_size = sizeof(struct udp_sock), |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2242 | .h.udp_table = &udp_table, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2243 | #ifdef CONFIG_COMPAT |
| 2244 | .compat_setsockopt = compat_udp_setsockopt, |
| 2245 | .compat_getsockopt = compat_udp_getsockopt, |
| 2246 | #endif |
David Ahern | 5d77dca | 2016-08-23 21:06:33 -0700 | [diff] [blame] | 2247 | .diag_destroy = udp_abort, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2248 | }; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2249 | EXPORT_SYMBOL(udp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | |
| 2251 | /* ------------------------------------------------------------------------ */ |
| 2252 | #ifdef CONFIG_PROC_FS |
| 2253 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2254 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | { |
| 2256 | struct sock *sk; |
| 2257 | struct udp_iter_state *state = seq->private; |
Denis V. Lunev | 6f191ef | 2008-03-28 18:23:33 -0700 | [diff] [blame] | 2258 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2260 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
| 2261 | ++state->bucket) { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2262 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2263 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 2264 | if (hlist_empty(&hslot->head)) |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2265 | continue; |
| 2266 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2267 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 2268 | sk_for_each(sk, &hslot->head) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2269 | if (!net_eq(sock_net(sk), net)) |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2270 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2271 | if (sk->sk_family == state->family) |
| 2272 | goto found; |
| 2273 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2274 | spin_unlock_bh(&hslot->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | } |
| 2276 | sk = NULL; |
| 2277 | found: |
| 2278 | return sk; |
| 2279 | } |
| 2280 | |
| 2281 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) |
| 2282 | { |
| 2283 | struct udp_iter_state *state = seq->private; |
Denis V. Lunev | 6f191ef | 2008-03-28 18:23:33 -0700 | [diff] [blame] | 2284 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2285 | |
| 2286 | do { |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 2287 | sk = sk_next(sk); |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2288 | } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2289 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2290 | if (!sk) { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2291 | if (state->bucket <= state->udp_table->mask) |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 2292 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2293 | return udp_get_first(seq, state->bucket + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | } |
| 2295 | return sk; |
| 2296 | } |
| 2297 | |
| 2298 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) |
| 2299 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2300 | struct sock *sk = udp_get_first(seq, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | |
| 2302 | if (sk) |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2303 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | --pos; |
| 2305 | return pos ? NULL : sk; |
| 2306 | } |
| 2307 | |
| 2308 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) |
| 2309 | { |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 2310 | struct udp_iter_state *state = seq->private; |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2311 | state->bucket = MAX_UDP_PORTS; |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 2312 | |
YOSHIFUJI Hideaki | b50660f | 2008-03-31 19:38:15 -0700 | [diff] [blame] | 2313 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2314 | } |
| 2315 | |
| 2316 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2317 | { |
| 2318 | struct sock *sk; |
| 2319 | |
YOSHIFUJI Hideaki | b50660f | 2008-03-31 19:38:15 -0700 | [diff] [blame] | 2320 | if (v == SEQ_START_TOKEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | sk = udp_get_idx(seq, 0); |
| 2322 | else |
| 2323 | sk = udp_get_next(seq, v); |
| 2324 | |
| 2325 | ++*pos; |
| 2326 | return sk; |
| 2327 | } |
| 2328 | |
| 2329 | static void udp_seq_stop(struct seq_file *seq, void *v) |
| 2330 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2331 | struct udp_iter_state *state = seq->private; |
| 2332 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2333 | if (state->bucket <= state->udp_table->mask) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2334 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | } |
| 2336 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2337 | int udp_seq_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2338 | { |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 2339 | struct udp_seq_afinfo *afinfo = PDE_DATA(inode); |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2340 | struct udp_iter_state *s; |
| 2341 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2343 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
| 2344 | sizeof(struct udp_iter_state)); |
| 2345 | if (err < 0) |
| 2346 | return err; |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2347 | |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2348 | s = ((struct seq_file *)file->private_data)->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | s->family = afinfo->family; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2350 | s->udp_table = afinfo->udp_table; |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2351 | return err; |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2352 | } |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2353 | EXPORT_SYMBOL(udp_seq_open); |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | /* ------------------------------------------------------------------------ */ |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 2356 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2357 | { |
| 2358 | struct proc_dir_entry *p; |
| 2359 | int rc = 0; |
| 2360 | |
Denis V. Lunev | dda6192 | 2008-03-28 18:24:26 -0700 | [diff] [blame] | 2361 | afinfo->seq_ops.start = udp_seq_start; |
| 2362 | afinfo->seq_ops.next = udp_seq_next; |
| 2363 | afinfo->seq_ops.stop = udp_seq_stop; |
| 2364 | |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2365 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2366 | afinfo->seq_fops, afinfo); |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2367 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | rc = -ENOMEM; |
| 2369 | return rc; |
| 2370 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2371 | EXPORT_SYMBOL(udp_proc_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2372 | |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 2373 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 2375 | remove_proc_entry(afinfo->name, net->proc_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2376 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2377 | EXPORT_SYMBOL(udp_proc_unregister); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2378 | |
| 2379 | /* ------------------------------------------------------------------------ */ |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2380 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2381 | int bucket) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2382 | { |
| 2383 | struct inet_sock *inet = inet_sk(sp); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2384 | __be32 dest = inet->inet_daddr; |
| 2385 | __be32 src = inet->inet_rcv_saddr; |
| 2386 | __u16 destp = ntohs(inet->inet_dport); |
| 2387 | __u16 srcp = ntohs(inet->inet_sport); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2388 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2389 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2390 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d", |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2391 | bucket, src, srcp, dest, destp, sp->sk_state, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 2392 | sk_wmem_alloc_get(sp), |
| 2393 | sk_rmem_alloc_get(sp), |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2394 | 0, 0L, 0, |
| 2395 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), |
| 2396 | 0, sock_i_ino(sp), |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 2397 | atomic_read(&sp->sk_refcnt), sp, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2398 | atomic_read(&sp->sk_drops)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2399 | } |
| 2400 | |
| 2401 | int udp4_seq_show(struct seq_file *seq, void *v) |
| 2402 | { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2403 | seq_setwidth(seq, 127); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2404 | if (v == SEQ_START_TOKEN) |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2405 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2406 | "rx_queue tr tm->when retrnsmt uid timeout " |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 2407 | "inode ref pointer drops"); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2408 | else { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2409 | struct udp_iter_state *state = seq->private; |
| 2410 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2411 | udp4_format_sock(v, seq, state->bucket); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2412 | } |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2413 | seq_pad(seq, '\n'); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2414 | return 0; |
| 2415 | } |
| 2416 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2417 | static const struct file_operations udp_afinfo_seq_fops = { |
| 2418 | .owner = THIS_MODULE, |
| 2419 | .open = udp_seq_open, |
| 2420 | .read = seq_read, |
| 2421 | .llseek = seq_lseek, |
| 2422 | .release = seq_release_net |
| 2423 | }; |
| 2424 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2425 | /* ------------------------------------------------------------------------ */ |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2426 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2427 | .name = "udp", |
| 2428 | .family = AF_INET, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2429 | .udp_table = &udp_table, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2430 | .seq_fops = &udp_afinfo_seq_fops, |
Denis V. Lunev | dda6192 | 2008-03-28 18:24:26 -0700 | [diff] [blame] | 2431 | .seq_ops = { |
| 2432 | .show = udp4_seq_show, |
| 2433 | }, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2434 | }; |
| 2435 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2436 | static int __net_init udp4_proc_init_net(struct net *net) |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2437 | { |
| 2438 | return udp_proc_register(net, &udp4_seq_afinfo); |
| 2439 | } |
| 2440 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2441 | static void __net_exit udp4_proc_exit_net(struct net *net) |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2442 | { |
| 2443 | udp_proc_unregister(net, &udp4_seq_afinfo); |
| 2444 | } |
| 2445 | |
| 2446 | static struct pernet_operations udp4_net_ops = { |
| 2447 | .init = udp4_proc_init_net, |
| 2448 | .exit = udp4_proc_exit_net, |
| 2449 | }; |
| 2450 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2451 | int __init udp4_proc_init(void) |
| 2452 | { |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2453 | return register_pernet_subsys(&udp4_net_ops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2454 | } |
| 2455 | |
| 2456 | void udp4_proc_exit(void) |
| 2457 | { |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2458 | unregister_pernet_subsys(&udp4_net_ops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2459 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2460 | #endif /* CONFIG_PROC_FS */ |
| 2461 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2462 | static __initdata unsigned long uhash_entries; |
| 2463 | static int __init set_uhash_entries(char *str) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2464 | { |
Eldad Zack | 413c27d | 2012-05-19 14:13:18 +0000 | [diff] [blame] | 2465 | ssize_t ret; |
| 2466 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2467 | if (!str) |
| 2468 | return 0; |
Eldad Zack | 413c27d | 2012-05-19 14:13:18 +0000 | [diff] [blame] | 2469 | |
| 2470 | ret = kstrtoul(str, 0, &uhash_entries); |
| 2471 | if (ret) |
| 2472 | return 0; |
| 2473 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2474 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) |
| 2475 | uhash_entries = UDP_HTABLE_SIZE_MIN; |
| 2476 | return 1; |
| 2477 | } |
| 2478 | __setup("uhash_entries=", set_uhash_entries); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2479 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2480 | void __init udp_table_init(struct udp_table *table, const char *name) |
| 2481 | { |
| 2482 | unsigned int i; |
| 2483 | |
Tim Bird | 31fe62b | 2012-05-23 13:33:35 +0000 | [diff] [blame] | 2484 | table->hash = alloc_large_system_hash(name, |
| 2485 | 2 * sizeof(struct udp_hslot), |
| 2486 | uhash_entries, |
| 2487 | 21, /* one slot per 2 MB */ |
| 2488 | 0, |
| 2489 | &table->log, |
| 2490 | &table->mask, |
| 2491 | UDP_HTABLE_SIZE_MIN, |
| 2492 | 64 * 1024); |
| 2493 | |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2494 | table->hash2 = table->hash + (table->mask + 1); |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2495 | for (i = 0; i <= table->mask; i++) { |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 2496 | INIT_HLIST_HEAD(&table->hash[i].head); |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 2497 | table->hash[i].count = 0; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2498 | spin_lock_init(&table->hash[i].lock); |
| 2499 | } |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2500 | for (i = 0; i <= table->mask; i++) { |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 2501 | INIT_HLIST_HEAD(&table->hash2[i].head); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2502 | table->hash2[i].count = 0; |
| 2503 | spin_lock_init(&table->hash2[i].lock); |
| 2504 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2505 | } |
| 2506 | |
Tom Herbert | 723b8e4 | 2015-02-24 09:17:31 -0800 | [diff] [blame] | 2507 | u32 udp_flow_hashrnd(void) |
| 2508 | { |
| 2509 | static u32 hashrnd __read_mostly; |
| 2510 | |
| 2511 | net_get_random_once(&hashrnd, sizeof(hashrnd)); |
| 2512 | |
| 2513 | return hashrnd; |
| 2514 | } |
| 2515 | EXPORT_SYMBOL(udp_flow_hashrnd); |
| 2516 | |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2517 | void __init udp_init(void) |
| 2518 | { |
Eric Dumazet | f03d78d | 2011-07-07 00:27:05 -0700 | [diff] [blame] | 2519 | unsigned long limit; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2520 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2521 | udp_table_init(&udp_table, "UDP"); |
Eric Dumazet | f03d78d | 2011-07-07 00:27:05 -0700 | [diff] [blame] | 2522 | limit = nr_free_buffer_pages() / 8; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2523 | limit = max(limit, 128UL); |
| 2524 | sysctl_udp_mem[0] = limit / 4 * 3; |
| 2525 | sysctl_udp_mem[1] = limit; |
| 2526 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; |
| 2527 | |
| 2528 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; |
| 2529 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; |
| 2530 | } |