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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 118 | struct udp_table udp_table __read_mostly; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 119 | EXPORT_SYMBOL(udp_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 121 | long sysctl_udp_mem[3] __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 122 | EXPORT_SYMBOL(sysctl_udp_mem); |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 123 | |
| 124 | int sysctl_udp_rmem_min __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 125 | EXPORT_SYMBOL(sysctl_udp_rmem_min); |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 126 | |
| 127 | int sysctl_udp_wmem_min __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 128 | EXPORT_SYMBOL(sysctl_udp_wmem_min); |
| 129 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 130 | atomic_long_t udp_memory_allocated; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 131 | EXPORT_SYMBOL(udp_memory_allocated); |
| 132 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 133 | #define MAX_UDP_PORTS 65536 |
| 134 | #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN) |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 135 | |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 136 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 137 | const struct udp_hslot *hslot, |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 138 | unsigned long *bitmap, |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 139 | struct sock *sk, |
| 140 | int (*saddr_comp)(const struct sock *sk1, |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 141 | const struct sock *sk2, |
| 142 | bool match_wildcard), |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 143 | unsigned int log) |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 144 | { |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 145 | struct sock *sk2; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 146 | struct hlist_nulls_node *node; |
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 | |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 149 | sk_nulls_for_each(sk2, node, &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; |
| 180 | struct hlist_nulls_node *node; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 181 | kuid_t uid = sock_i_uid(sk); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 182 | int res = 0; |
| 183 | |
| 184 | spin_lock(&hslot2->lock); |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 185 | udp_portaddr_for_each_entry(sk2, node, &hslot2->head) { |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 186 | if (net_eq(sock_net(sk2), net) && |
| 187 | sk2 != sk && |
| 188 | (udp_sk(sk2)->udp_port_hash == num) && |
| 189 | (!sk2->sk_reuse || !sk->sk_reuse) && |
| 190 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || |
| 191 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 192 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 193 | rcu_access_pointer(sk->sk_reuseport_cb) || |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 194 | !uid_eq(uid, sock_i_uid(sk2))) && |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 195 | saddr_comp(sk, sk2, true)) { |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 196 | res = 1; |
| 197 | break; |
| 198 | } |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 199 | } |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 200 | spin_unlock(&hslot2->lock); |
| 201 | return res; |
| 202 | } |
| 203 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 204 | static int udp_reuseport_add_sock(struct sock *sk, struct udp_hslot *hslot, |
| 205 | int (*saddr_same)(const struct sock *sk1, |
| 206 | const struct sock *sk2, |
| 207 | bool match_wildcard)) |
| 208 | { |
| 209 | struct net *net = sock_net(sk); |
| 210 | struct hlist_nulls_node *node; |
| 211 | kuid_t uid = sock_i_uid(sk); |
| 212 | struct sock *sk2; |
| 213 | |
| 214 | sk_nulls_for_each(sk2, node, &hslot->head) { |
| 215 | if (net_eq(sock_net(sk2), net) && |
| 216 | sk2 != sk && |
| 217 | sk2->sk_family == sk->sk_family && |
| 218 | ipv6_only_sock(sk2) == ipv6_only_sock(sk) && |
| 219 | (udp_sk(sk2)->udp_port_hash == udp_sk(sk)->udp_port_hash) && |
| 220 | (sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && |
| 221 | sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) && |
| 222 | (*saddr_same)(sk, sk2, false)) { |
| 223 | return reuseport_add_sock(sk, sk2); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | /* Initial allocation may have already happened via setsockopt */ |
| 228 | if (!rcu_access_pointer(sk->sk_reuseport_cb)) |
| 229 | return reuseport_alloc(sk); |
| 230 | return 0; |
| 231 | } |
| 232 | |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 233 | /** |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 234 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 235 | * |
| 236 | * @sk: socket struct in question |
| 237 | * @snum: port number to look up |
David S. Miller | df2bc45 | 2007-06-05 15:18:43 -0700 | [diff] [blame] | 238 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 239 | * @hash2_nulladdr: AF-dependent hash value in secondary hash chains, |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 240 | * with NULL address |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 241 | */ |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 242 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 243 | int (*saddr_comp)(const struct sock *sk1, |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 244 | const struct sock *sk2, |
| 245 | bool match_wildcard), |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 246 | unsigned int hash2_nulladdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | { |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 248 | struct udp_hslot *hslot, *hslot2; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 249 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 250 | int error = 1; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 251 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
Stephen Hemminger | 32c1da7 | 2007-08-24 23:09:41 -0700 | [diff] [blame] | 253 | if (!snum) { |
Eric Dumazet | 9088c56 | 2008-10-08 11:44:17 -0700 | [diff] [blame] | 254 | int low, high, remaining; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 255 | unsigned int rand; |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 256 | unsigned short first, last; |
| 257 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
Eric W. Biederman | 0bbf87d | 2013-09-28 14:10:59 -0700 | [diff] [blame] | 259 | inet_get_local_port_range(net, &low, &high); |
Anton Arapov | a25de53 | 2007-10-18 22:00:17 -0700 | [diff] [blame] | 260 | remaining = (high - low) + 1; |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 261 | |
Aruna-Hewapathirane | 63862b5 | 2014-01-11 07:15:59 -0500 | [diff] [blame] | 262 | rand = prandom_u32(); |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 263 | first = reciprocal_scale(rand, remaining) + low; |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 264 | /* |
| 265 | * force rand to be an odd multiple of UDP_HTABLE_SIZE |
| 266 | */ |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 267 | rand = (rand | 1) * (udptable->mask + 1); |
Eric Dumazet | 5781b23 | 2009-12-13 19:32:39 -0800 | [diff] [blame] | 268 | last = first + udptable->mask + 1; |
| 269 | do { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 270 | hslot = udp_hashslot(udptable, net, first); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 271 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 272 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 273 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 274 | saddr_comp, udptable->log); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 275 | |
| 276 | snum = first; |
| 277 | /* |
| 278 | * Iterate on all possible values of snum for this hash. |
| 279 | * Using steps of an odd multiple of UDP_HTABLE_SIZE |
| 280 | * give us randomization and full range coverage. |
| 281 | */ |
Eric Dumazet | 9088c56 | 2008-10-08 11:44:17 -0700 | [diff] [blame] | 282 | do { |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 283 | if (low <= snum && snum <= high && |
Amerigo Wang | e3826f1 | 2010-05-05 00:27:06 +0000 | [diff] [blame] | 284 | !test_bit(snum >> udptable->log, bitmap) && |
WANG Cong | 122ff24 | 2014-05-12 16:04:53 -0700 | [diff] [blame] | 285 | !inet_is_local_reserved_port(net, snum)) |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 286 | goto found; |
| 287 | snum += rand; |
| 288 | } while (snum != first); |
| 289 | spin_unlock_bh(&hslot->lock); |
Eric Dumazet | 5781b23 | 2009-12-13 19:32:39 -0800 | [diff] [blame] | 290 | } while (++first != last); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 291 | goto fail; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 292 | } else { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 293 | hslot = udp_hashslot(udptable, net, snum); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 294 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 295 | if (hslot->count > 10) { |
| 296 | int exist; |
| 297 | unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum; |
| 298 | |
| 299 | slot2 &= udptable->mask; |
| 300 | hash2_nulladdr &= udptable->mask; |
| 301 | |
| 302 | hslot2 = udp_hashslot2(udptable, slot2); |
| 303 | if (hslot->count < hslot2->count) |
| 304 | goto scan_primary_hash; |
| 305 | |
| 306 | exist = udp_lib_lport_inuse2(net, snum, hslot2, |
| 307 | sk, saddr_comp); |
| 308 | if (!exist && (hash2_nulladdr != slot2)) { |
| 309 | hslot2 = udp_hashslot2(udptable, hash2_nulladdr); |
| 310 | exist = udp_lib_lport_inuse2(net, snum, hslot2, |
| 311 | sk, saddr_comp); |
| 312 | } |
| 313 | if (exist) |
| 314 | goto fail_unlock; |
| 315 | else |
| 316 | goto found; |
| 317 | } |
| 318 | scan_primary_hash: |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 319 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, |
| 320 | saddr_comp, 0)) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 321 | goto fail_unlock; |
| 322 | } |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 323 | found: |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 324 | inet_sk(sk)->inet_num = snum; |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 325 | udp_sk(sk)->udp_port_hash = snum; |
| 326 | udp_sk(sk)->udp_portaddr_hash ^= snum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | if (sk_unhashed(sk)) { |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 328 | if (sk->sk_reuseport && |
| 329 | udp_reuseport_add_sock(sk, hslot, saddr_comp)) { |
| 330 | inet_sk(sk)->inet_num = 0; |
| 331 | udp_sk(sk)->udp_port_hash = 0; |
| 332 | udp_sk(sk)->udp_portaddr_hash ^= snum; |
| 333 | goto fail_unlock; |
| 334 | } |
| 335 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 336 | sk_nulls_add_node_rcu(sk, &hslot->head); |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 337 | hslot->count++; |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 338 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 339 | |
| 340 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
| 341 | spin_lock(&hslot2->lock); |
| 342 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
| 343 | &hslot2->head); |
| 344 | hslot2->count++; |
| 345 | spin_unlock(&hslot2->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 347 | error = 0; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 348 | fail_unlock: |
| 349 | spin_unlock_bh(&hslot->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | fail: |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 351 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 353 | EXPORT_SYMBOL(udp_lib_get_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 355 | /* match_wildcard == true: 0.0.0.0 equals to any IPv4 addresses |
| 356 | * match_wildcard == false: addresses must be exactly the same, i.e. |
| 357 | * 0.0.0.0 only equals to 0.0.0.0 |
| 358 | */ |
Craig Gallek | c125e80 | 2016-02-10 11:50:40 -0500 | [diff] [blame] | 359 | int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2, |
| 360 | bool match_wildcard) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 361 | { |
| 362 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); |
| 363 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 364 | if (!ipv6_only_sock(sk2)) { |
| 365 | if (inet1->inet_rcv_saddr == inet2->inet_rcv_saddr) |
| 366 | return 1; |
| 367 | if (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr) |
| 368 | return match_wildcard; |
| 369 | } |
| 370 | return 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 371 | } |
| 372 | |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 373 | static u32 udp4_portaddr_hash(const struct net *net, __be32 saddr, |
| 374 | unsigned int port) |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 375 | { |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 376 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 377 | } |
| 378 | |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 379 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 380 | { |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 381 | unsigned int hash2_nulladdr = |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 382 | udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 383 | unsigned int hash2_partial = |
| 384 | udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0); |
| 385 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 386 | /* precompute partial secondary hash */ |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 387 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
| 388 | 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] | 389 | } |
| 390 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 391 | static inline int compute_score(struct sock *sk, struct net *net, |
| 392 | __be32 saddr, unsigned short hnum, __be16 sport, |
| 393 | __be32 daddr, __be16 dport, int dif) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 394 | { |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 395 | int score; |
| 396 | struct inet_sock *inet; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 397 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 398 | if (!net_eq(sock_net(sk), net) || |
| 399 | udp_sk(sk)->udp_port_hash != hnum || |
| 400 | ipv6_only_sock(sk)) |
| 401 | return -1; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 402 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 403 | score = (sk->sk_family == PF_INET) ? 2 : 1; |
| 404 | inet = inet_sk(sk); |
| 405 | |
| 406 | if (inet->inet_rcv_saddr) { |
| 407 | if (inet->inet_rcv_saddr != daddr) |
| 408 | return -1; |
| 409 | score += 4; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 410 | } |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 411 | |
| 412 | if (inet->inet_daddr) { |
| 413 | if (inet->inet_daddr != saddr) |
| 414 | return -1; |
| 415 | score += 4; |
| 416 | } |
| 417 | |
| 418 | if (inet->inet_dport) { |
| 419 | if (inet->inet_dport != sport) |
| 420 | return -1; |
| 421 | score += 4; |
| 422 | } |
| 423 | |
| 424 | if (sk->sk_bound_dev_if) { |
| 425 | if (sk->sk_bound_dev_if != dif) |
| 426 | return -1; |
| 427 | score += 4; |
| 428 | } |
Eric Dumazet | 70da268 | 2015-10-08 19:33:21 -0700 | [diff] [blame] | 429 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
| 430 | score++; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 431 | return score; |
| 432 | } |
| 433 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 434 | /* |
| 435 | * In this second variant, we check (daddr, dport) matches (inet_rcv_sadd, inet_num) |
| 436 | */ |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 437 | static inline int compute_score2(struct sock *sk, struct net *net, |
| 438 | __be32 saddr, __be16 sport, |
| 439 | __be32 daddr, unsigned int hnum, int dif) |
| 440 | { |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 441 | int score; |
| 442 | struct inet_sock *inet; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 443 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 444 | if (!net_eq(sock_net(sk), net) || |
| 445 | ipv6_only_sock(sk)) |
| 446 | return -1; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 447 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 448 | inet = inet_sk(sk); |
| 449 | |
| 450 | if (inet->inet_rcv_saddr != daddr || |
| 451 | inet->inet_num != hnum) |
| 452 | return -1; |
| 453 | |
| 454 | score = (sk->sk_family == PF_INET) ? 2 : 1; |
| 455 | |
| 456 | if (inet->inet_daddr) { |
| 457 | if (inet->inet_daddr != saddr) |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 458 | return -1; |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 459 | score += 4; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 460 | } |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 461 | |
| 462 | if (inet->inet_dport) { |
| 463 | if (inet->inet_dport != sport) |
| 464 | return -1; |
| 465 | score += 4; |
| 466 | } |
| 467 | |
| 468 | if (sk->sk_bound_dev_if) { |
| 469 | if (sk->sk_bound_dev_if != dif) |
| 470 | return -1; |
| 471 | score += 4; |
| 472 | } |
| 473 | |
Eric Dumazet | 70da268 | 2015-10-08 19:33:21 -0700 | [diff] [blame] | 474 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
| 475 | score++; |
| 476 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 477 | return score; |
| 478 | } |
| 479 | |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 480 | static u32 udp_ehashfn(const struct net *net, const __be32 laddr, |
| 481 | const __u16 lport, const __be32 faddr, |
| 482 | const __be16 fport) |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 483 | { |
Hannes Frederic Sowa | 1bbdcee | 2013-10-19 21:48:57 +0200 | [diff] [blame] | 484 | static u32 udp_ehash_secret __read_mostly; |
| 485 | |
| 486 | net_get_random_once(&udp_ehash_secret, sizeof(udp_ehash_secret)); |
| 487 | |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 488 | return __inet_ehashfn(laddr, lport, faddr, fport, |
Hannes Frederic Sowa | 1bbdcee | 2013-10-19 21:48:57 +0200 | [diff] [blame] | 489 | udp_ehash_secret + net_hash_mix(net)); |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 490 | } |
| 491 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 492 | /* called with read_rcu_lock() */ |
| 493 | static struct sock *udp4_lib_lookup2(struct net *net, |
| 494 | __be32 saddr, __be16 sport, |
| 495 | __be32 daddr, unsigned int hnum, int dif, |
Craig Gallek | 1134158 | 2016-01-05 15:08:07 -0500 | [diff] [blame] | 496 | struct udp_hslot *hslot2, unsigned int slot2, |
| 497 | struct sk_buff *skb) |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 498 | { |
| 499 | struct sock *sk, *result; |
| 500 | struct hlist_nulls_node *node; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 501 | int score, badness, matches = 0, reuseport = 0; |
Eric Dumazet | ed0dfff | 2016-01-19 08:36:43 -0800 | [diff] [blame] | 502 | bool select_ok = true; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 503 | u32 hash = 0; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 504 | |
| 505 | begin: |
| 506 | result = NULL; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 507 | badness = 0; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 508 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { |
| 509 | score = compute_score2(sk, net, saddr, sport, |
| 510 | daddr, hnum, dif); |
| 511 | if (score > badness) { |
| 512 | result = sk; |
| 513 | badness = score; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 514 | reuseport = sk->sk_reuseport; |
| 515 | if (reuseport) { |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 516 | hash = udp_ehashfn(net, daddr, hnum, |
| 517 | saddr, sport); |
Eric Dumazet | ed0dfff | 2016-01-19 08:36:43 -0800 | [diff] [blame] | 518 | if (select_ok) { |
| 519 | struct sock *sk2; |
| 520 | |
| 521 | sk2 = reuseport_select_sock(sk, hash, skb, |
| 522 | sizeof(struct udphdr)); |
| 523 | if (sk2) { |
| 524 | result = sk2; |
| 525 | select_ok = false; |
| 526 | goto found; |
| 527 | } |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 528 | } |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 529 | matches = 1; |
| 530 | } |
| 531 | } else if (score == badness && reuseport) { |
| 532 | matches++; |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 533 | if (reciprocal_scale(hash, matches) == 0) |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 534 | result = sk; |
| 535 | hash = next_pseudo_random32(hash); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 536 | } |
| 537 | } |
| 538 | /* |
| 539 | * if the nulls value we got at the end of this lookup is |
| 540 | * not the expected one, we must restart lookup. |
| 541 | * We probably met an item that was moved to another chain. |
| 542 | */ |
| 543 | if (get_nulls_value(node) != slot2) |
| 544 | goto begin; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 545 | if (result) { |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 546 | found: |
Eric Dumazet | c31504d | 2010-11-15 19:58:26 +0000 | [diff] [blame] | 547 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 548 | result = NULL; |
| 549 | else if (unlikely(compute_score2(result, net, saddr, sport, |
| 550 | daddr, hnum, dif) < badness)) { |
| 551 | sock_put(result); |
| 552 | goto begin; |
| 553 | } |
| 554 | } |
| 555 | return result; |
| 556 | } |
| 557 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 558 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
| 559 | * harder than this. -DaveM |
| 560 | */ |
Pavel Emelyanov | fce8233 | 2011-12-09 06:23:34 +0000 | [diff] [blame] | 561 | struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 562 | __be16 sport, __be32 daddr, __be16 dport, |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 563 | int dif, struct udp_table *udptable, struct sk_buff *skb) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 564 | { |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 565 | struct sock *sk, *result; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 566 | struct hlist_nulls_node *node; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 567 | unsigned short hnum = ntohs(dport); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 568 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
| 569 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 570 | int score, badness, matches = 0, reuseport = 0; |
Eric Dumazet | ed0dfff | 2016-01-19 08:36:43 -0800 | [diff] [blame] | 571 | bool select_ok = true; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 572 | u32 hash = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 573 | |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 574 | rcu_read_lock(); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 575 | if (hslot->count > 10) { |
| 576 | hash2 = udp4_portaddr_hash(net, daddr, hnum); |
| 577 | slot2 = hash2 & udptable->mask; |
| 578 | hslot2 = &udptable->hash2[slot2]; |
| 579 | if (hslot->count < hslot2->count) |
| 580 | goto begin; |
| 581 | |
| 582 | result = udp4_lib_lookup2(net, saddr, sport, |
| 583 | daddr, hnum, dif, |
Craig Gallek | 1134158 | 2016-01-05 15:08:07 -0500 | [diff] [blame] | 584 | hslot2, slot2, skb); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 585 | if (!result) { |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 586 | hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 587 | slot2 = hash2 & udptable->mask; |
| 588 | hslot2 = &udptable->hash2[slot2]; |
| 589 | if (hslot->count < hslot2->count) |
| 590 | goto begin; |
| 591 | |
Jorge Boncompte [DTI2] | 1223c67 | 2010-04-08 04:56:48 +0000 | [diff] [blame] | 592 | result = udp4_lib_lookup2(net, saddr, sport, |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 593 | htonl(INADDR_ANY), hnum, dif, |
Craig Gallek | 1134158 | 2016-01-05 15:08:07 -0500 | [diff] [blame] | 594 | hslot2, slot2, skb); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 595 | } |
| 596 | rcu_read_unlock(); |
| 597 | return result; |
| 598 | } |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 599 | begin: |
| 600 | result = NULL; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 601 | badness = 0; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 602 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 603 | score = compute_score(sk, net, saddr, hnum, sport, |
| 604 | daddr, dport, dif); |
| 605 | if (score > badness) { |
| 606 | result = sk; |
| 607 | badness = score; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 608 | reuseport = sk->sk_reuseport; |
| 609 | if (reuseport) { |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 610 | hash = udp_ehashfn(net, daddr, hnum, |
| 611 | saddr, sport); |
Eric Dumazet | ed0dfff | 2016-01-19 08:36:43 -0800 | [diff] [blame] | 612 | if (select_ok) { |
| 613 | struct sock *sk2; |
| 614 | |
| 615 | sk2 = reuseport_select_sock(sk, hash, skb, |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 616 | sizeof(struct udphdr)); |
Eric Dumazet | ed0dfff | 2016-01-19 08:36:43 -0800 | [diff] [blame] | 617 | if (sk2) { |
| 618 | result = sk2; |
| 619 | select_ok = false; |
| 620 | goto found; |
| 621 | } |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 622 | } |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 623 | matches = 1; |
| 624 | } |
| 625 | } else if (score == badness && reuseport) { |
| 626 | matches++; |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 627 | if (reciprocal_scale(hash, matches) == 0) |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 628 | result = sk; |
| 629 | hash = next_pseudo_random32(hash); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 630 | } |
| 631 | } |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 632 | /* |
| 633 | * if the nulls value we got at the end of this lookup is |
| 634 | * not the expected one, we must restart lookup. |
| 635 | * We probably met an item that was moved to another chain. |
| 636 | */ |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 637 | if (get_nulls_value(node) != slot) |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 638 | goto begin; |
| 639 | |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 640 | if (result) { |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 641 | found: |
Eric Dumazet | c31504d | 2010-11-15 19:58:26 +0000 | [diff] [blame] | 642 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 643 | result = NULL; |
| 644 | else if (unlikely(compute_score(result, net, saddr, hnum, sport, |
| 645 | daddr, dport, dif) < badness)) { |
| 646 | sock_put(result); |
| 647 | goto begin; |
| 648 | } |
| 649 | } |
| 650 | rcu_read_unlock(); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 651 | return result; |
| 652 | } |
Pavel Emelyanov | fce8233 | 2011-12-09 06:23:34 +0000 | [diff] [blame] | 653 | EXPORT_SYMBOL_GPL(__udp4_lib_lookup); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 654 | |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 655 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
| 656 | __be16 sport, __be16 dport, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 657 | struct udp_table *udptable) |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 658 | { |
| 659 | const struct iphdr *iph = ip_hdr(skb); |
| 660 | |
Eric Dumazet | 8afdd99 | 2013-12-10 18:07:23 -0800 | [diff] [blame] | 661 | return __udp4_lib_lookup(dev_net(skb_dst(skb)->dev), iph->saddr, sport, |
| 662 | iph->daddr, dport, inet_iif(skb), |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 663 | udptable, skb); |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 664 | } |
| 665 | |
KOVACS Krisztian | bcd4130 | 2008-10-01 07:48:10 -0700 | [diff] [blame] | 666 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
| 667 | __be32 daddr, __be16 dport, int dif) |
| 668 | { |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 669 | return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 670 | &udp_table, NULL); |
KOVACS Krisztian | bcd4130 | 2008-10-01 07:48:10 -0700 | [diff] [blame] | 671 | } |
| 672 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); |
| 673 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 674 | static inline bool __udp_is_mcast_sock(struct net *net, struct sock *sk, |
| 675 | __be16 loc_port, __be32 loc_addr, |
| 676 | __be16 rmt_port, __be32 rmt_addr, |
| 677 | int dif, unsigned short hnum) |
| 678 | { |
| 679 | struct inet_sock *inet = inet_sk(sk); |
| 680 | |
| 681 | if (!net_eq(sock_net(sk), net) || |
| 682 | udp_sk(sk)->udp_port_hash != hnum || |
| 683 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || |
| 684 | (inet->inet_dport != rmt_port && inet->inet_dport) || |
| 685 | (inet->inet_rcv_saddr && inet->inet_rcv_saddr != loc_addr) || |
| 686 | ipv6_only_sock(sk) || |
| 687 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) |
| 688 | return false; |
| 689 | if (!ip_mc_sf_allow(sk, loc_addr, rmt_addr, dif)) |
| 690 | return false; |
| 691 | return true; |
| 692 | } |
| 693 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 694 | /* |
| 695 | * This routine is called by the ICMP module when it gets some |
| 696 | * sort of error condition. If err < 0 then the socket should |
| 697 | * be closed and the error returned to the user. If err > 0 |
| 698 | * it's just the icmp type << 8 | icmp code. |
| 699 | * Header points to the ip header of the error packet. We move |
| 700 | * on past this. Then (as it used to claim before adjustment) |
| 701 | * header points to the first 8 bytes of the udp header. We need |
| 702 | * to find the appropriate port. |
| 703 | */ |
| 704 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 705 | 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] | 706 | { |
| 707 | struct inet_sock *inet; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 708 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 709 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 710 | const int type = icmp_hdr(skb)->type; |
| 711 | const int code = icmp_hdr(skb)->code; |
| 712 | struct sock *sk; |
| 713 | int harderr; |
| 714 | int err; |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 715 | struct net *net = dev_net(skb->dev); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 716 | |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 717 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 718 | iph->saddr, uh->source, skb->dev->ifindex, udptable, |
| 719 | NULL); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 720 | if (!sk) { |
Pavel Emelyanov | dcfc23c | 2008-07-14 23:03:00 -0700 | [diff] [blame] | 721 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 722 | return; /* No socket for error */ |
| 723 | } |
| 724 | |
| 725 | err = 0; |
| 726 | harderr = 0; |
| 727 | inet = inet_sk(sk); |
| 728 | |
| 729 | switch (type) { |
| 730 | default: |
| 731 | case ICMP_TIME_EXCEEDED: |
| 732 | err = EHOSTUNREACH; |
| 733 | break; |
| 734 | case ICMP_SOURCE_QUENCH: |
| 735 | goto out; |
| 736 | case ICMP_PARAMETERPROB: |
| 737 | err = EPROTO; |
| 738 | harderr = 1; |
| 739 | break; |
| 740 | case ICMP_DEST_UNREACH: |
| 741 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 742 | ipv4_sk_update_pmtu(skb, sk, info); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 743 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { |
| 744 | err = EMSGSIZE; |
| 745 | harderr = 1; |
| 746 | break; |
| 747 | } |
| 748 | goto out; |
| 749 | } |
| 750 | err = EHOSTUNREACH; |
| 751 | if (code <= NR_ICMP_UNREACH) { |
| 752 | harderr = icmp_err_convert[code].fatal; |
| 753 | err = icmp_err_convert[code].errno; |
| 754 | } |
| 755 | break; |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 756 | case ICMP_REDIRECT: |
| 757 | ipv4_sk_redirect(skb, sk); |
Duan Jiong | 1a462d1 | 2013-09-20 18:20:28 +0800 | [diff] [blame] | 758 | goto out; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 759 | } |
| 760 | |
| 761 | /* |
| 762 | * RFC1122: OK. Passes ICMP errors back to application, as per |
| 763 | * 4.1.3.3. |
| 764 | */ |
| 765 | if (!inet->recverr) { |
| 766 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
| 767 | goto out; |
Eric Dumazet | b1faf56 | 2010-05-31 23:44:05 -0700 | [diff] [blame] | 768 | } else |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 769 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
Eric Dumazet | b1faf56 | 2010-05-31 23:44:05 -0700 | [diff] [blame] | 770 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 771 | sk->sk_err = err; |
| 772 | sk->sk_error_report(sk); |
| 773 | out: |
| 774 | sock_put(sk); |
| 775 | } |
| 776 | |
| 777 | void udp_err(struct sk_buff *skb, u32 info) |
| 778 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 779 | __udp4_lib_err(skb, info, &udp_table); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 780 | } |
| 781 | |
| 782 | /* |
| 783 | * Throw away all pending data and cancel the corking. Socket is locked. |
| 784 | */ |
Denis V. Lunev | 36d926b | 2008-06-04 15:49:07 +0400 | [diff] [blame] | 785 | void udp_flush_pending_frames(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 786 | { |
| 787 | struct udp_sock *up = udp_sk(sk); |
| 788 | |
| 789 | if (up->pending) { |
| 790 | up->len = 0; |
| 791 | up->pending = 0; |
| 792 | ip_flush_pending_frames(sk); |
| 793 | } |
| 794 | } |
Denis V. Lunev | 36d926b | 2008-06-04 15:49:07 +0400 | [diff] [blame] | 795 | EXPORT_SYMBOL(udp_flush_pending_frames); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 796 | |
| 797 | /** |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 798 | * udp4_hwcsum - handle outgoing HW checksumming |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 799 | * @skb: sk_buff containing the filled-in UDP header |
| 800 | * (checksum field must be zeroed out) |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 801 | * @src: source IP address |
| 802 | * @dst: destination IP address |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 803 | */ |
Thomas Graf | c26bf4a | 2013-07-25 18:12:18 +0200 | [diff] [blame] | 804 | void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 805 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 806 | struct udphdr *uh = udp_hdr(skb); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 807 | int offset = skb_transport_offset(skb); |
| 808 | int len = skb->len - offset; |
| 809 | int hlen = len; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 810 | __wsum csum = 0; |
| 811 | |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 812 | if (!skb_has_frag_list(skb)) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 813 | /* |
| 814 | * Only one fragment on the socket. |
| 815 | */ |
| 816 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 817 | skb->csum_offset = offsetof(struct udphdr, check); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 818 | uh->check = ~csum_tcpudp_magic(src, dst, len, |
| 819 | IPPROTO_UDP, 0); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 820 | } else { |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 821 | struct sk_buff *frags; |
| 822 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 823 | /* |
| 824 | * HW-checksum won't work as there are two or more |
| 825 | * fragments on the socket so that all csums of sk_buffs |
| 826 | * should be together |
| 827 | */ |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 828 | skb_walk_frags(skb, frags) { |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 829 | csum = csum_add(csum, frags->csum); |
| 830 | hlen -= frags->len; |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 831 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 832 | |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 833 | csum = skb_checksum(skb, offset, hlen, csum); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 834 | skb->ip_summed = CHECKSUM_NONE; |
| 835 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 836 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); |
| 837 | if (uh->check == 0) |
| 838 | uh->check = CSUM_MANGLED_0; |
| 839 | } |
| 840 | } |
Thomas Graf | c26bf4a | 2013-07-25 18:12:18 +0200 | [diff] [blame] | 841 | EXPORT_SYMBOL_GPL(udp4_hwcsum); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 842 | |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 843 | /* Function to set UDP checksum for an IPv4 UDP packet. This is intended |
| 844 | * for the simple case like when setting the checksum for a UDP tunnel. |
| 845 | */ |
| 846 | void udp_set_csum(bool nocheck, struct sk_buff *skb, |
| 847 | __be32 saddr, __be32 daddr, int len) |
| 848 | { |
| 849 | struct udphdr *uh = udp_hdr(skb); |
| 850 | |
Edward Cree | 179bc67 | 2016-02-11 20:48:04 +0000 | [diff] [blame] | 851 | if (nocheck) { |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 852 | uh->check = 0; |
Edward Cree | 179bc67 | 2016-02-11 20:48:04 +0000 | [diff] [blame] | 853 | } else if (skb_is_gso(skb)) { |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 854 | uh->check = ~udp_v4_check(len, saddr, daddr, 0); |
Edward Cree | 179bc67 | 2016-02-11 20:48:04 +0000 | [diff] [blame] | 855 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| 856 | uh->check = 0; |
| 857 | uh->check = udp_v4_check(len, saddr, daddr, lco_csum(skb)); |
| 858 | if (uh->check == 0) |
| 859 | uh->check = CSUM_MANGLED_0; |
Edward Cree | d75f130 | 2016-02-11 20:49:40 +0000 | [diff] [blame] | 860 | } else { |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 861 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 862 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 863 | skb->csum_offset = offsetof(struct udphdr, check); |
| 864 | uh->check = ~udp_v4_check(len, saddr, daddr, 0); |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 865 | } |
| 866 | } |
| 867 | EXPORT_SYMBOL(udp_set_csum); |
| 868 | |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 869 | static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4) |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 870 | { |
| 871 | struct sock *sk = skb->sk; |
| 872 | struct inet_sock *inet = inet_sk(sk); |
| 873 | struct udphdr *uh; |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 874 | int err = 0; |
| 875 | int is_udplite = IS_UDPLITE(sk); |
| 876 | int offset = skb_transport_offset(skb); |
| 877 | int len = skb->len - offset; |
| 878 | __wsum csum = 0; |
| 879 | |
| 880 | /* |
| 881 | * Create a UDP header |
| 882 | */ |
| 883 | uh = udp_hdr(skb); |
| 884 | uh->source = inet->inet_sport; |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 885 | uh->dest = fl4->fl4_dport; |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 886 | uh->len = htons(len); |
| 887 | uh->check = 0; |
| 888 | |
| 889 | if (is_udplite) /* UDP-Lite */ |
| 890 | csum = udplite_csum(skb); |
| 891 | |
Tom Herbert | 28448b8 | 2014-05-23 08:47:19 -0700 | [diff] [blame] | 892 | else if (sk->sk_no_check_tx) { /* UDP csum disabled */ |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 893 | |
| 894 | skb->ip_summed = CHECKSUM_NONE; |
| 895 | goto send; |
| 896 | |
| 897 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
| 898 | |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 899 | udp4_hwcsum(skb, fl4->saddr, fl4->daddr); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 900 | goto send; |
| 901 | |
| 902 | } else |
| 903 | csum = udp_csum(skb); |
| 904 | |
| 905 | /* add protocol-dependent pseudo-header */ |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 906 | uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len, |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 907 | sk->sk_protocol, csum); |
| 908 | if (uh->check == 0) |
| 909 | uh->check = CSUM_MANGLED_0; |
| 910 | |
| 911 | send: |
Eric Dumazet | b5ec8ee | 2012-08-10 02:22:47 +0000 | [diff] [blame] | 912 | err = ip_send_skb(sock_net(sk), skb); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 913 | if (err) { |
| 914 | if (err == -ENOBUFS && !inet->recverr) { |
| 915 | UDP_INC_STATS_USER(sock_net(sk), |
| 916 | UDP_MIB_SNDBUFERRORS, is_udplite); |
| 917 | err = 0; |
| 918 | } |
| 919 | } else |
| 920 | UDP_INC_STATS_USER(sock_net(sk), |
| 921 | UDP_MIB_OUTDATAGRAMS, is_udplite); |
| 922 | return err; |
| 923 | } |
| 924 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 925 | /* |
| 926 | * Push out all pending data as one UDP datagram. Socket is locked. |
| 927 | */ |
Hannes Frederic Sowa | 8822b64 | 2013-07-01 20:21:30 +0200 | [diff] [blame] | 928 | int udp_push_pending_frames(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 929 | { |
| 930 | struct udp_sock *up = udp_sk(sk); |
| 931 | struct inet_sock *inet = inet_sk(sk); |
David S. Miller | b6f21b2 | 2011-03-12 02:09:18 -0500 | [diff] [blame] | 932 | struct flowi4 *fl4 = &inet->cork.fl.u.ip4; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 933 | struct sk_buff *skb; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 934 | int err = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 935 | |
David S. Miller | 77968b7 | 2011-05-08 17:12:19 -0700 | [diff] [blame] | 936 | skb = ip_finish_skb(sk, fl4); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 937 | if (!skb) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 938 | goto out; |
| 939 | |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 940 | err = udp_send_skb(skb, fl4); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 941 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 942 | out: |
| 943 | up->len = 0; |
| 944 | up->pending = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 945 | return err; |
| 946 | } |
Hannes Frederic Sowa | 8822b64 | 2013-07-01 20:21:30 +0200 | [diff] [blame] | 947 | EXPORT_SYMBOL(udp_push_pending_frames); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 948 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 949 | 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] | 950 | { |
| 951 | struct inet_sock *inet = inet_sk(sk); |
| 952 | struct udp_sock *up = udp_sk(sk); |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 953 | struct flowi4 fl4_stack; |
David S. Miller | b6f21b2 | 2011-03-12 02:09:18 -0500 | [diff] [blame] | 954 | struct flowi4 *fl4; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 955 | int ulen = len; |
| 956 | struct ipcm_cookie ipc; |
| 957 | struct rtable *rt = NULL; |
| 958 | int free = 0; |
| 959 | int connected = 0; |
| 960 | __be32 daddr, faddr, saddr; |
| 961 | __be16 dport; |
| 962 | u8 tos; |
| 963 | int err, is_udplite = IS_UDPLITE(sk); |
| 964 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
| 965 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 966 | struct sk_buff *skb; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 967 | struct ip_options_data opt_copy; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 968 | |
| 969 | if (len > 0xFFFF) |
| 970 | return -EMSGSIZE; |
| 971 | |
| 972 | /* |
| 973 | * Check the flags. |
| 974 | */ |
| 975 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 976 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 977 | return -EOPNOTSUPP; |
| 978 | |
| 979 | ipc.opt = NULL; |
Oliver Hartkopp | 2244d07 | 2010-08-17 08:59:14 +0000 | [diff] [blame] | 980 | ipc.tx_flags = 0; |
Francesco Fusco | aa66158 | 2013-09-24 15:43:09 +0200 | [diff] [blame] | 981 | ipc.ttl = 0; |
| 982 | ipc.tos = -1; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 983 | |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 984 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
| 985 | |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 986 | fl4 = &inet->cork.fl.u.ip4; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 987 | if (up->pending) { |
| 988 | /* |
| 989 | * There are pending frames. |
| 990 | * The socket lock must be held while it's corked. |
| 991 | */ |
| 992 | lock_sock(sk); |
| 993 | if (likely(up->pending)) { |
| 994 | if (unlikely(up->pending != AF_INET)) { |
| 995 | release_sock(sk); |
| 996 | return -EINVAL; |
| 997 | } |
| 998 | goto do_append_data; |
| 999 | } |
| 1000 | release_sock(sk); |
| 1001 | } |
| 1002 | ulen += sizeof(struct udphdr); |
| 1003 | |
| 1004 | /* |
| 1005 | * Get and verify the address. |
| 1006 | */ |
| 1007 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 1008 | DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1009 | if (msg->msg_namelen < sizeof(*usin)) |
| 1010 | return -EINVAL; |
| 1011 | if (usin->sin_family != AF_INET) { |
| 1012 | if (usin->sin_family != AF_UNSPEC) |
| 1013 | return -EAFNOSUPPORT; |
| 1014 | } |
| 1015 | |
| 1016 | daddr = usin->sin_addr.s_addr; |
| 1017 | dport = usin->sin_port; |
| 1018 | if (dport == 0) |
| 1019 | return -EINVAL; |
| 1020 | } else { |
| 1021 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1022 | return -EDESTADDRREQ; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1023 | daddr = inet->inet_daddr; |
| 1024 | dport = inet->inet_dport; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1025 | /* Open fast path for connected socket. |
| 1026 | Route will not be used, if at least one option is set. |
| 1027 | */ |
| 1028 | connected = 1; |
| 1029 | } |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1030 | ipc.addr = inet->inet_saddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1031 | |
| 1032 | ipc.oif = sk->sk_bound_dev_if; |
Daniel Borkmann | bf84a01 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 1033 | |
| 1034 | sock_tx_timestamp(sk, &ipc.tx_flags); |
| 1035 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1036 | if (msg->msg_controllen) { |
Hannes Frederic Sowa | c8e6ad0 | 2014-02-18 21:38:08 +0100 | [diff] [blame] | 1037 | err = ip_cmsg_send(sock_net(sk), msg, &ipc, |
| 1038 | sk->sk_family == AF_INET6); |
Eric Dumazet | 9194830 | 2016-02-04 06:23:28 -0800 | [diff] [blame] | 1039 | if (unlikely(err)) { |
| 1040 | kfree(ipc.opt); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1041 | return err; |
Eric Dumazet | 9194830 | 2016-02-04 06:23:28 -0800 | [diff] [blame] | 1042 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1043 | if (ipc.opt) |
| 1044 | free = 1; |
| 1045 | connected = 0; |
| 1046 | } |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1047 | if (!ipc.opt) { |
| 1048 | struct ip_options_rcu *inet_opt; |
| 1049 | |
| 1050 | rcu_read_lock(); |
| 1051 | inet_opt = rcu_dereference(inet->inet_opt); |
| 1052 | if (inet_opt) { |
| 1053 | memcpy(&opt_copy, inet_opt, |
| 1054 | sizeof(*inet_opt) + inet_opt->opt.optlen); |
| 1055 | ipc.opt = &opt_copy.opt; |
| 1056 | } |
| 1057 | rcu_read_unlock(); |
| 1058 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1059 | |
| 1060 | saddr = ipc.addr; |
| 1061 | ipc.addr = faddr = daddr; |
| 1062 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1063 | if (ipc.opt && ipc.opt->opt.srr) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1064 | if (!daddr) |
| 1065 | return -EINVAL; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1066 | faddr = ipc.opt->opt.faddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1067 | connected = 0; |
| 1068 | } |
Francesco Fusco | aa66158 | 2013-09-24 15:43:09 +0200 | [diff] [blame] | 1069 | tos = get_rttos(&ipc, inet); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1070 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
| 1071 | (msg->msg_flags & MSG_DONTROUTE) || |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1072 | (ipc.opt && ipc.opt->opt.is_strictroute)) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1073 | tos |= RTO_ONLINK; |
| 1074 | connected = 0; |
| 1075 | } |
| 1076 | |
| 1077 | if (ipv4_is_multicast(daddr)) { |
| 1078 | if (!ipc.oif) |
| 1079 | ipc.oif = inet->mc_index; |
| 1080 | if (!saddr) |
| 1081 | saddr = inet->mc_addr; |
| 1082 | connected = 0; |
Erich E. Hoover | 76e2105 | 2012-02-08 09:11:07 +0000 | [diff] [blame] | 1083 | } else if (!ipc.oif) |
| 1084 | ipc.oif = inet->uc_index; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1085 | |
| 1086 | if (connected) |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1087 | rt = (struct rtable *)sk_dst_check(sk, 0); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1088 | |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1089 | if (!rt) { |
Pavel Emelyanov | 84a3aa0 | 2008-07-16 20:19:08 -0700 | [diff] [blame] | 1090 | struct net *net = sock_net(sk); |
David Ahern | 9a24abf | 2015-08-13 14:59:03 -0600 | [diff] [blame] | 1091 | __u8 flow_flags = inet_sk_flowi_flags(sk); |
Pavel Emelyanov | 84a3aa0 | 2008-07-16 20:19:08 -0700 | [diff] [blame] | 1092 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1093 | fl4 = &fl4_stack; |
David Ahern | 9a24abf | 2015-08-13 14:59:03 -0600 | [diff] [blame] | 1094 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1095 | flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos, |
David S. Miller | c0951cb | 2011-03-31 04:54:27 -0700 | [diff] [blame] | 1096 | RT_SCOPE_UNIVERSE, sk->sk_protocol, |
David Ahern | 9a24abf | 2015-08-13 14:59:03 -0600 | [diff] [blame] | 1097 | flow_flags, |
David S. Miller | c0951cb | 2011-03-31 04:54:27 -0700 | [diff] [blame] | 1098 | faddr, saddr, dport, inet->inet_sport); |
| 1099 | |
David Ahern | b5bdacf | 2016-01-04 09:09:27 -0800 | [diff] [blame] | 1100 | if (!saddr && ipc.oif) { |
| 1101 | err = l3mdev_get_saddr(net, ipc.oif, fl4); |
| 1102 | if (err < 0) |
| 1103 | goto out; |
| 1104 | } |
David Ahern | 8cbb512c | 2015-10-05 08:51:26 -0700 | [diff] [blame] | 1105 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1106 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
| 1107 | rt = ip_route_output_flow(net, fl4, sk); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1108 | if (IS_ERR(rt)) { |
| 1109 | err = PTR_ERR(rt); |
David S. Miller | 06dc94b | 2011-03-03 10:38:01 -0800 | [diff] [blame] | 1110 | rt = NULL; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1111 | if (err == -ENETUNREACH) |
Eric Dumazet | f1d8cba | 2013-11-28 09:51:22 -0800 | [diff] [blame] | 1112 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1113 | goto out; |
| 1114 | } |
| 1115 | |
| 1116 | err = -EACCES; |
| 1117 | if ((rt->rt_flags & RTCF_BROADCAST) && |
| 1118 | !sock_flag(sk, SOCK_BROADCAST)) |
| 1119 | goto out; |
| 1120 | if (connected) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1121 | sk_dst_set(sk, dst_clone(&rt->dst)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1122 | } |
| 1123 | |
| 1124 | if (msg->msg_flags&MSG_CONFIRM) |
| 1125 | goto do_confirm; |
| 1126 | back_from_confirm: |
| 1127 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1128 | saddr = fl4->saddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1129 | if (!ipc.addr) |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1130 | daddr = ipc.addr = fl4->daddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1131 | |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 1132 | /* Lockless fast path for the non-corking case. */ |
| 1133 | if (!corkreq) { |
Al Viro | f69e6d1 | 2014-11-24 13:23:40 -0500 | [diff] [blame] | 1134 | skb = ip_make_skb(sk, fl4, getfrag, msg, ulen, |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 1135 | sizeof(struct udphdr), &ipc, &rt, |
| 1136 | msg->msg_flags); |
| 1137 | err = PTR_ERR(skb); |
YOSHIFUJI Hideaki / 吉藤英明 | 50c3a48 | 2013-01-22 06:32:49 +0000 | [diff] [blame] | 1138 | if (!IS_ERR_OR_NULL(skb)) |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 1139 | err = udp_send_skb(skb, fl4); |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 1140 | goto out; |
| 1141 | } |
| 1142 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1143 | lock_sock(sk); |
| 1144 | if (unlikely(up->pending)) { |
| 1145 | /* The socket is already corked while preparing it. */ |
| 1146 | /* ... which is an evident application bug. --ANK */ |
| 1147 | release_sock(sk); |
| 1148 | |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1149 | net_dbg_ratelimited("cork app bug 2\n"); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1150 | err = -EINVAL; |
| 1151 | goto out; |
| 1152 | } |
| 1153 | /* |
| 1154 | * Now cork the socket to pend data. |
| 1155 | */ |
David S. Miller | b6f21b2 | 2011-03-12 02:09:18 -0500 | [diff] [blame] | 1156 | fl4 = &inet->cork.fl.u.ip4; |
| 1157 | fl4->daddr = daddr; |
| 1158 | fl4->saddr = saddr; |
David S. Miller | 9cce96d | 2011-03-12 03:00:33 -0500 | [diff] [blame] | 1159 | fl4->fl4_dport = dport; |
| 1160 | fl4->fl4_sport = inet->inet_sport; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1161 | up->pending = AF_INET; |
| 1162 | |
| 1163 | do_append_data: |
| 1164 | up->len += ulen; |
Al Viro | f69e6d1 | 2014-11-24 13:23:40 -0500 | [diff] [blame] | 1165 | err = ip_append_data(sk, fl4, getfrag, msg, ulen, |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 1166 | sizeof(struct udphdr), &ipc, &rt, |
| 1167 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1168 | if (err) |
| 1169 | udp_flush_pending_frames(sk); |
| 1170 | else if (!corkreq) |
| 1171 | err = udp_push_pending_frames(sk); |
| 1172 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
| 1173 | up->pending = 0; |
| 1174 | release_sock(sk); |
| 1175 | |
| 1176 | out: |
| 1177 | ip_rt_put(rt); |
| 1178 | if (free) |
| 1179 | kfree(ipc.opt); |
| 1180 | if (!err) |
| 1181 | return len; |
| 1182 | /* |
| 1183 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting |
| 1184 | * ENOBUFS might not be good (it's not tunable per se), but otherwise |
| 1185 | * we don't have a good statistic (IpOutDiscards but it can be too many |
| 1186 | * things). We could add another new stat but at least for now that |
| 1187 | * seems like overkill. |
| 1188 | */ |
| 1189 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { |
Pavel Emelyanov | 629ca23 | 2008-07-05 21:18:07 -0700 | [diff] [blame] | 1190 | UDP_INC_STATS_USER(sock_net(sk), |
| 1191 | UDP_MIB_SNDBUFERRORS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1192 | } |
| 1193 | return err; |
| 1194 | |
| 1195 | do_confirm: |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1196 | dst_confirm(&rt->dst); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1197 | if (!(msg->msg_flags&MSG_PROBE) || len) |
| 1198 | goto back_from_confirm; |
| 1199 | err = 0; |
| 1200 | goto out; |
| 1201 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1202 | EXPORT_SYMBOL(udp_sendmsg); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1203 | |
| 1204 | int udp_sendpage(struct sock *sk, struct page *page, int offset, |
| 1205 | size_t size, int flags) |
| 1206 | { |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 1207 | struct inet_sock *inet = inet_sk(sk); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1208 | struct udp_sock *up = udp_sk(sk); |
| 1209 | int ret; |
| 1210 | |
Shawn Landden | d3f7d56 | 2013-11-24 22:36:28 -0800 | [diff] [blame] | 1211 | if (flags & MSG_SENDPAGE_NOTLAST) |
| 1212 | flags |= MSG_MORE; |
| 1213 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1214 | if (!up->pending) { |
| 1215 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; |
| 1216 | |
| 1217 | /* Call udp_sendmsg to specify destination address which |
| 1218 | * sendpage interface can't pass. |
| 1219 | * This will succeed only when the socket is connected. |
| 1220 | */ |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1221 | ret = udp_sendmsg(sk, &msg, 0); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1222 | if (ret < 0) |
| 1223 | return ret; |
| 1224 | } |
| 1225 | |
| 1226 | lock_sock(sk); |
| 1227 | |
| 1228 | if (unlikely(!up->pending)) { |
| 1229 | release_sock(sk); |
| 1230 | |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1231 | net_dbg_ratelimited("udp cork app bug 3\n"); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1232 | return -EINVAL; |
| 1233 | } |
| 1234 | |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 1235 | ret = ip_append_page(sk, &inet->cork.fl.u.ip4, |
| 1236 | page, offset, size, flags); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1237 | if (ret == -EOPNOTSUPP) { |
| 1238 | release_sock(sk); |
| 1239 | return sock_no_sendpage(sk->sk_socket, page, offset, |
| 1240 | size, flags); |
| 1241 | } |
| 1242 | if (ret < 0) { |
| 1243 | udp_flush_pending_frames(sk); |
| 1244 | goto out; |
| 1245 | } |
| 1246 | |
| 1247 | up->len += size; |
| 1248 | if (!(up->corkflag || (flags&MSG_MORE))) |
| 1249 | ret = udp_push_pending_frames(sk); |
| 1250 | if (!ret) |
| 1251 | ret = size; |
| 1252 | out: |
| 1253 | release_sock(sk); |
| 1254 | return ret; |
| 1255 | } |
| 1256 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1257 | /** |
| 1258 | * first_packet_length - return length of first packet in receive queue |
| 1259 | * @sk: socket |
| 1260 | * |
| 1261 | * Drops all bad checksum frames, until a valid one is found. |
| 1262 | * Returns the length of found skb, or 0 if none is found. |
| 1263 | */ |
| 1264 | static unsigned int first_packet_length(struct sock *sk) |
| 1265 | { |
| 1266 | struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue; |
| 1267 | struct sk_buff *skb; |
| 1268 | unsigned int res; |
| 1269 | |
| 1270 | __skb_queue_head_init(&list_kill); |
| 1271 | |
| 1272 | spin_lock_bh(&rcvq->lock); |
| 1273 | while ((skb = skb_peek(rcvq)) != NULL && |
| 1274 | udp_lib_checksum_complete(skb)) { |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1275 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, |
| 1276 | IS_UDPLITE(sk)); |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1277 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, |
| 1278 | IS_UDPLITE(sk)); |
Eric Dumazet | 8edf19c | 2009-10-15 00:12:40 +0000 | [diff] [blame] | 1279 | atomic_inc(&sk->sk_drops); |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1280 | __skb_unlink(skb, rcvq); |
| 1281 | __skb_queue_tail(&list_kill, skb); |
| 1282 | } |
| 1283 | res = skb ? skb->len : 0; |
| 1284 | spin_unlock_bh(&rcvq->lock); |
| 1285 | |
| 1286 | if (!skb_queue_empty(&list_kill)) { |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1287 | bool slow = lock_sock_fast(sk); |
| 1288 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1289 | __skb_queue_purge(&list_kill); |
| 1290 | sk_mem_reclaim_partial(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1291 | unlock_sock_fast(sk, slow); |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1292 | } |
| 1293 | return res; |
| 1294 | } |
| 1295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | /* |
| 1297 | * IOCTL requests applicable to the UDP protocol |
| 1298 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 1301 | { |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1302 | switch (cmd) { |
| 1303 | case SIOCOUTQ: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | { |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 1305 | int amount = sk_wmem_alloc_get(sk); |
| 1306 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1307 | return put_user(amount, (int __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | } |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1309 | |
| 1310 | case SIOCINQ: |
| 1311 | { |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1312 | unsigned int amount = first_packet_length(sk); |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1313 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1314 | if (amount) |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1315 | /* |
| 1316 | * We will only return the amount |
| 1317 | * of this packet since that is all |
| 1318 | * that will be read. |
| 1319 | */ |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1320 | amount -= sizeof(struct udphdr); |
| 1321 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1322 | return put_user(amount, (int __user *)arg); |
| 1323 | } |
| 1324 | |
| 1325 | default: |
| 1326 | return -ENOIOCTLCMD; |
| 1327 | } |
| 1328 | |
| 1329 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1331 | EXPORT_SYMBOL(udp_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1333 | /* |
| 1334 | * This should be easy, if there is something there we |
| 1335 | * return it, otherwise we block. |
| 1336 | */ |
| 1337 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1338 | int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock, |
| 1339 | int flags, int *addr_len) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1340 | { |
| 1341 | struct inet_sock *inet = inet_sk(sk); |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 1342 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1343 | struct sk_buff *skb; |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1344 | unsigned int ulen, copied; |
Pavel Emelyanov | 3f518bf | 2012-02-21 07:30:58 +0000 | [diff] [blame] | 1345 | int peeked, off = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1346 | int err; |
| 1347 | int is_udplite = IS_UDPLITE(sk); |
Eric Dumazet | 197c949 | 2015-12-30 08:51:12 -0500 | [diff] [blame] | 1348 | bool checksum_valid = false; |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1349 | bool slow; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1350 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1351 | if (flags & MSG_ERRQUEUE) |
Hannes Frederic Sowa | 85fbaa7 | 2013-11-23 00:46:12 +0100 | [diff] [blame] | 1352 | return ip_recv_error(sk, msg, len, addr_len); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1353 | |
| 1354 | try_again: |
| 1355 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
Pavel Emelyanov | 3f518bf | 2012-02-21 07:30:58 +0000 | [diff] [blame] | 1356 | &peeked, &off, &err); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1357 | if (!skb) |
| 1358 | goto out; |
| 1359 | |
| 1360 | ulen = skb->len - sizeof(struct udphdr); |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1361 | copied = len; |
| 1362 | if (copied > ulen) |
| 1363 | copied = ulen; |
| 1364 | else if (copied < ulen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1365 | msg->msg_flags |= MSG_TRUNC; |
| 1366 | |
| 1367 | /* |
| 1368 | * If checksum is needed at all, try to do it while copying the |
| 1369 | * data. If the data is truncated, or if we only want a partial |
| 1370 | * coverage checksum (UDP-Lite), do it before the copy. |
| 1371 | */ |
| 1372 | |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1373 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
Eric Dumazet | 197c949 | 2015-12-30 08:51:12 -0500 | [diff] [blame] | 1374 | checksum_valid = !udp_lib_checksum_complete(skb); |
| 1375 | if (!checksum_valid) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1376 | goto csum_copy_err; |
| 1377 | } |
| 1378 | |
Eric Dumazet | 197c949 | 2015-12-30 08:51:12 -0500 | [diff] [blame] | 1379 | if (checksum_valid || skb_csum_unnecessary(skb)) |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 1380 | err = skb_copy_datagram_msg(skb, sizeof(struct udphdr), |
| 1381 | msg, copied); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1382 | else { |
Al Viro | 227158d | 2014-04-06 18:47:38 -0400 | [diff] [blame] | 1383 | err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), |
| 1384 | msg); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1385 | |
| 1386 | if (err == -EINVAL) |
| 1387 | goto csum_copy_err; |
| 1388 | } |
| 1389 | |
Eric Dumazet | 22911fc | 2012-06-27 00:23:44 +0000 | [diff] [blame] | 1390 | if (unlikely(err)) { |
| 1391 | trace_kfree_skb(skb, udp_recvmsg); |
Eric Dumazet | 979402b | 2012-09-05 23:34:44 +0000 | [diff] [blame] | 1392 | if (!peeked) { |
| 1393 | atomic_inc(&sk->sk_drops); |
| 1394 | UDP_INC_STATS_USER(sock_net(sk), |
| 1395 | UDP_MIB_INERRORS, is_udplite); |
| 1396 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1397 | goto out_free; |
Eric Dumazet | 22911fc | 2012-06-27 00:23:44 +0000 | [diff] [blame] | 1398 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1399 | |
| 1400 | if (!peeked) |
Pavel Emelyanov | 629ca23 | 2008-07-05 21:18:07 -0700 | [diff] [blame] | 1401 | UDP_INC_STATS_USER(sock_net(sk), |
| 1402 | UDP_MIB_INDATAGRAMS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1403 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1404 | sock_recv_ts_and_drops(msg, sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1405 | |
| 1406 | /* Copy the address. */ |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1407 | if (sin) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1408 | sin->sin_family = AF_INET; |
| 1409 | sin->sin_port = udp_hdr(skb)->source; |
| 1410 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| 1411 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
Hannes Frederic Sowa | bceaa90 | 2013-11-18 04:20:45 +0100 | [diff] [blame] | 1412 | *addr_len = sizeof(*sin); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1413 | } |
| 1414 | if (inet->cmsg_flags) |
Tom Herbert | ad6f939 | 2015-01-05 13:56:17 -0800 | [diff] [blame] | 1415 | ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1416 | |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1417 | err = copied; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1418 | if (flags & MSG_TRUNC) |
| 1419 | err = ulen; |
| 1420 | |
| 1421 | out_free: |
Eric Dumazet | 9d410c7 | 2009-10-30 05:03:53 +0000 | [diff] [blame] | 1422 | skb_free_datagram_locked(sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1423 | out: |
| 1424 | return err; |
| 1425 | |
| 1426 | csum_copy_err: |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1427 | slow = lock_sock_fast(sk); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1428 | if (!skb_kill_datagram(sk, skb, flags)) { |
| 1429 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
Pavel Emelyanov | 629ca23 | 2008-07-05 21:18:07 -0700 | [diff] [blame] | 1430 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1431 | } |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1432 | unlock_sock_fast(sk, slow); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1433 | |
Eric Dumazet | beb39db | 2015-05-30 09:16:53 -0700 | [diff] [blame] | 1434 | /* starting over for a new packet, but check if we need to yield */ |
| 1435 | cond_resched(); |
Xufeng Zhang | 9cfaa8d | 2011-06-21 10:43:40 +0000 | [diff] [blame] | 1436 | msg->msg_flags &= ~MSG_TRUNC; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1437 | goto try_again; |
| 1438 | } |
| 1439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | int udp_disconnect(struct sock *sk, int flags) |
| 1441 | { |
| 1442 | struct inet_sock *inet = inet_sk(sk); |
| 1443 | /* |
| 1444 | * 1003.1g - break association. |
| 1445 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | sk->sk_state = TCP_CLOSE; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1448 | inet->inet_daddr = 0; |
| 1449 | inet->inet_dport = 0; |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1450 | sock_rps_reset_rxhash(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | sk->sk_bound_dev_if = 0; |
| 1452 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 1453 | inet_reset_saddr(sk); |
| 1454 | |
| 1455 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { |
| 1456 | sk->sk_prot->unhash(sk); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1457 | inet->inet_sport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | } |
| 1459 | sk_dst_reset(sk); |
| 1460 | return 0; |
| 1461 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1462 | EXPORT_SYMBOL(udp_disconnect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1464 | void udp_lib_unhash(struct sock *sk) |
| 1465 | { |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1466 | if (sk_hashed(sk)) { |
| 1467 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 1468 | struct udp_hslot *hslot, *hslot2; |
| 1469 | |
| 1470 | hslot = udp_hashslot(udptable, sock_net(sk), |
| 1471 | udp_sk(sk)->udp_port_hash); |
| 1472 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1473 | |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1474 | spin_lock_bh(&hslot->lock); |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1475 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
| 1476 | reuseport_detach_sock(sk); |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1477 | if (sk_nulls_del_node_init_rcu(sk)) { |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 1478 | hslot->count--; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1479 | inet_sk(sk)->inet_num = 0; |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1480 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 1481 | |
| 1482 | spin_lock(&hslot2->lock); |
| 1483 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
| 1484 | hslot2->count--; |
| 1485 | spin_unlock(&hslot2->lock); |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1486 | } |
| 1487 | spin_unlock_bh(&hslot->lock); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1488 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1489 | } |
| 1490 | EXPORT_SYMBOL(udp_lib_unhash); |
| 1491 | |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1492 | /* |
| 1493 | * inet_rcv_saddr was changed, we must rehash secondary hash |
| 1494 | */ |
| 1495 | void udp_lib_rehash(struct sock *sk, u16 newhash) |
| 1496 | { |
| 1497 | if (sk_hashed(sk)) { |
| 1498 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
| 1499 | struct udp_hslot *hslot, *hslot2, *nhslot2; |
| 1500 | |
| 1501 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
| 1502 | nhslot2 = udp_hashslot2(udptable, newhash); |
| 1503 | udp_sk(sk)->udp_portaddr_hash = newhash; |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1504 | |
| 1505 | if (hslot2 != nhslot2 || |
| 1506 | rcu_access_pointer(sk->sk_reuseport_cb)) { |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1507 | hslot = udp_hashslot(udptable, sock_net(sk), |
| 1508 | udp_sk(sk)->udp_port_hash); |
| 1509 | /* we must lock primary chain too */ |
| 1510 | spin_lock_bh(&hslot->lock); |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1511 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
| 1512 | reuseport_detach_sock(sk); |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1513 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1514 | if (hslot2 != nhslot2) { |
| 1515 | spin_lock(&hslot2->lock); |
| 1516 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
| 1517 | hslot2->count--; |
| 1518 | spin_unlock(&hslot2->lock); |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1519 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 1520 | spin_lock(&nhslot2->lock); |
| 1521 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
| 1522 | &nhslot2->head); |
| 1523 | nhslot2->count++; |
| 1524 | spin_unlock(&nhslot2->lock); |
| 1525 | } |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1526 | |
| 1527 | spin_unlock_bh(&hslot->lock); |
| 1528 | } |
| 1529 | } |
| 1530 | } |
| 1531 | EXPORT_SYMBOL(udp_lib_rehash); |
| 1532 | |
| 1533 | static void udp_v4_rehash(struct sock *sk) |
| 1534 | { |
| 1535 | u16 new_hash = udp4_portaddr_hash(sock_net(sk), |
| 1536 | inet_sk(sk)->inet_rcv_saddr, |
| 1537 | inet_sk(sk)->inet_num); |
| 1538 | udp_lib_rehash(sk, new_hash); |
| 1539 | } |
| 1540 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1541 | static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 1542 | { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 1543 | int rc; |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1544 | |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 1545 | if (inet_sk(sk)->inet_daddr) { |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1546 | sock_rps_save_rxhash(sk, skb); |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 1547 | sk_mark_napi_id(sk, skb); |
Eric Dumazet | 2c8c56e | 2014-11-11 05:54:28 -0800 | [diff] [blame] | 1548 | sk_incoming_cpu_update(sk); |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 1549 | } |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 1550 | |
Eric Dumazet | d826eb1 | 2011-11-09 07:24:35 +0000 | [diff] [blame] | 1551 | rc = sock_queue_rcv_skb(sk, skb); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1552 | if (rc < 0) { |
| 1553 | int is_udplite = IS_UDPLITE(sk); |
| 1554 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1555 | /* Note that an ENOMEM error is charged twice */ |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1556 | if (rc == -ENOMEM) |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1557 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
| 1558 | is_udplite); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1559 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
| 1560 | kfree_skb(skb); |
Satoru Moriya | 296f7ea | 2011-06-17 11:58:39 +0000 | [diff] [blame] | 1561 | trace_udp_fail_queue_rcv_skb(rc, sk); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1562 | return -1; |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1563 | } |
| 1564 | |
| 1565 | return 0; |
| 1566 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1567 | } |
| 1568 | |
Eric Dumazet | 447167b | 2012-04-11 23:05:28 +0000 | [diff] [blame] | 1569 | static struct static_key udp_encap_needed __read_mostly; |
| 1570 | void udp_encap_enable(void) |
| 1571 | { |
| 1572 | if (!static_key_enabled(&udp_encap_needed)) |
| 1573 | static_key_slow_inc(&udp_encap_needed); |
| 1574 | } |
| 1575 | EXPORT_SYMBOL(udp_encap_enable); |
| 1576 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1577 | /* returns: |
| 1578 | * -1: error |
| 1579 | * 0: success |
| 1580 | * >0: "udp encap" protocol resubmission |
| 1581 | * |
| 1582 | * Note that in the success and error cases, the skb is assumed to |
| 1583 | * have either been requeued or freed. |
| 1584 | */ |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1585 | 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] | 1586 | { |
| 1587 | struct udp_sock *up = udp_sk(sk); |
| 1588 | int rc; |
| 1589 | int is_udplite = IS_UDPLITE(sk); |
| 1590 | |
| 1591 | /* |
| 1592 | * Charge it to the socket, dropping if the queue is full. |
| 1593 | */ |
| 1594 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1595 | goto drop; |
| 1596 | nf_reset(skb); |
| 1597 | |
Eric Dumazet | 447167b | 2012-04-11 23:05:28 +0000 | [diff] [blame] | 1598 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
Eric Dumazet | 0ad92ad | 2011-11-01 12:56:59 +0000 | [diff] [blame] | 1599 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
| 1600 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1601 | /* |
| 1602 | * This is an encapsulation socket so pass the skb to |
| 1603 | * the socket's udp_encap_rcv() hook. Otherwise, just |
| 1604 | * fall through and pass this up the UDP socket. |
| 1605 | * up->encap_rcv() returns the following value: |
| 1606 | * =0 if skb was successfully passed to the encap |
| 1607 | * handler or was discarded by it. |
| 1608 | * >0 if skb should be passed on to UDP. |
| 1609 | * <0 if skb should be resubmitted as proto -N |
| 1610 | */ |
| 1611 | |
| 1612 | /* if we're overly short, let UDP handle it */ |
Eric Dumazet | 0ad92ad | 2011-11-01 12:56:59 +0000 | [diff] [blame] | 1613 | encap_rcv = ACCESS_ONCE(up->encap_rcv); |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1614 | if (skb->len > sizeof(struct udphdr) && encap_rcv) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1615 | int ret; |
| 1616 | |
Tom Herbert | 0a80966 | 2014-05-07 16:52:39 -0700 | [diff] [blame] | 1617 | /* Verify checksum before giving to encap */ |
| 1618 | if (udp_lib_checksum_complete(skb)) |
| 1619 | goto csum_error; |
| 1620 | |
Eric Dumazet | 0ad92ad | 2011-11-01 12:56:59 +0000 | [diff] [blame] | 1621 | ret = encap_rcv(sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1622 | if (ret <= 0) { |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1623 | UDP_INC_STATS_BH(sock_net(sk), |
| 1624 | UDP_MIB_INDATAGRAMS, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1625 | is_udplite); |
| 1626 | return -ret; |
| 1627 | } |
| 1628 | } |
| 1629 | |
| 1630 | /* FALLTHROUGH -- it's a UDP Packet */ |
| 1631 | } |
| 1632 | |
| 1633 | /* |
| 1634 | * UDP-Lite specific tests, ignored on UDP sockets |
| 1635 | */ |
| 1636 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
| 1637 | |
| 1638 | /* |
| 1639 | * MIB statistics other than incrementing the error count are |
| 1640 | * disabled for the following two types of errors: these depend |
| 1641 | * on the application settings, not on the functioning of the |
| 1642 | * protocol stack as such. |
| 1643 | * |
| 1644 | * RFC 3828 here recommends (sec 3.3): "There should also be a |
| 1645 | * way ... to ... at least let the receiving application block |
| 1646 | * delivery of packets with coverage values less than a value |
| 1647 | * provided by the application." |
| 1648 | */ |
| 1649 | if (up->pcrlen == 0) { /* full coverage was set */ |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1650 | net_dbg_ratelimited("UDPLite: partial coverage %d while full coverage %d requested\n", |
| 1651 | UDP_SKB_CB(skb)->cscov, skb->len); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1652 | goto drop; |
| 1653 | } |
| 1654 | /* The next case involves violating the min. coverage requested |
| 1655 | * by the receiver. This is subtle: if receiver wants x and x is |
| 1656 | * greater than the buffersize/MTU then receiver will complain |
| 1657 | * that it wants x while sender emits packets of smaller size y. |
| 1658 | * Therefore the above ...()->partial_cov statement is essential. |
| 1659 | */ |
| 1660 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1661 | net_dbg_ratelimited("UDPLite: coverage %d too small, need min %d\n", |
| 1662 | UDP_SKB_CB(skb)->cscov, up->pcrlen); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1663 | goto drop; |
| 1664 | } |
| 1665 | } |
| 1666 | |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 1667 | if (rcu_access_pointer(sk->sk_filter) && |
| 1668 | udp_lib_checksum_complete(skb)) |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1669 | goto csum_error; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1670 | |
Sorin Dumitru | 274f482 | 2014-07-22 21:16:51 +0300 | [diff] [blame] | 1671 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
James M Leddy | 3e215c8 | 2014-06-25 17:38:13 -0400 | [diff] [blame] | 1672 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
| 1673 | is_udplite); |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 1674 | goto drop; |
James M Leddy | 3e215c8 | 2014-06-25 17:38:13 -0400 | [diff] [blame] | 1675 | } |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 1676 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1677 | rc = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1678 | |
Shawn Bohrer | fbf8866 | 2013-10-07 11:01:40 -0500 | [diff] [blame] | 1679 | ipv4_pktinfo_prepare(sk, skb); |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1680 | bh_lock_sock(sk); |
| 1681 | if (!sock_owned_by_user(sk)) |
| 1682 | rc = __udp_queue_rcv_skb(sk, skb); |
Eric Dumazet | f545a38 | 2012-04-22 23:34:26 +0000 | [diff] [blame] | 1683 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
Zhu Yi | 5534979 | 2010-03-04 18:01:42 +0000 | [diff] [blame] | 1684 | bh_unlock_sock(sk); |
| 1685 | goto drop; |
| 1686 | } |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1687 | bh_unlock_sock(sk); |
| 1688 | |
| 1689 | return rc; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1690 | |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1691 | csum_error: |
| 1692 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1693 | drop: |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1694 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 8edf19c | 2009-10-15 00:12:40 +0000 | [diff] [blame] | 1695 | atomic_inc(&sk->sk_drops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1696 | kfree_skb(skb); |
| 1697 | return -1; |
| 1698 | } |
| 1699 | |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1700 | static void flush_stack(struct sock **stack, unsigned int count, |
| 1701 | struct sk_buff *skb, unsigned int final) |
| 1702 | { |
| 1703 | unsigned int i; |
| 1704 | struct sk_buff *skb1 = NULL; |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 1705 | struct sock *sk; |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1706 | |
| 1707 | for (i = 0; i < count; i++) { |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 1708 | sk = stack[i]; |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1709 | if (likely(!skb1)) |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1710 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); |
| 1711 | |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 1712 | if (!skb1) { |
| 1713 | atomic_inc(&sk->sk_drops); |
| 1714 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
| 1715 | IS_UDPLITE(sk)); |
| 1716 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, |
| 1717 | IS_UDPLITE(sk)); |
| 1718 | } |
| 1719 | |
| 1720 | if (skb1 && udp_queue_rcv_skb(sk, skb1) <= 0) |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1721 | skb1 = NULL; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1722 | |
| 1723 | sock_put(sk); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1724 | } |
| 1725 | if (unlikely(skb1)) |
| 1726 | kfree_skb(skb1); |
| 1727 | } |
| 1728 | |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1729 | /* For TCP sockets, sk_rx_dst is protected by socket lock |
Eric Dumazet | e47eb5d | 2013-12-15 10:53:46 -0800 | [diff] [blame] | 1730 | * For UDP, we use xchg() to guard against concurrent changes. |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1731 | */ |
| 1732 | 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] | 1733 | { |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1734 | struct dst_entry *old; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1735 | |
Eric Dumazet | e47eb5d | 2013-12-15 10:53:46 -0800 | [diff] [blame] | 1736 | dst_hold(dst); |
| 1737 | old = xchg(&sk->sk_rx_dst, dst); |
| 1738 | dst_release(old); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1739 | } |
| 1740 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1741 | /* |
| 1742 | * Multicasts and broadcasts go to each listener. |
| 1743 | * |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1744 | * Note: called only from the BH handler context. |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1745 | */ |
Pavel Emelyanov | e316349 | 2008-06-16 17:12:11 -0700 | [diff] [blame] | 1746 | 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] | 1747 | struct udphdr *uh, |
| 1748 | __be32 saddr, __be32 daddr, |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1749 | struct udp_table *udptable, |
| 1750 | int proto) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1751 | { |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1752 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 1753 | struct hlist_nulls_node *node; |
| 1754 | unsigned short hnum = ntohs(uh->dest); |
| 1755 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); |
| 1756 | int dif = skb->dev->ifindex; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1757 | unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node); |
| 1758 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1759 | bool inner_flushed = false; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1760 | |
| 1761 | if (use_hash2) { |
| 1762 | hash2_any = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum) & |
| 1763 | udp_table.mask; |
| 1764 | hash2 = udp4_portaddr_hash(net, daddr, hnum) & udp_table.mask; |
| 1765 | start_lookup: |
| 1766 | hslot = &udp_table.hash2[hash2]; |
| 1767 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
| 1768 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1769 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1770 | spin_lock(&hslot->lock); |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1771 | sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) { |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 1772 | if (__udp_is_mcast_sock(net, sk, |
| 1773 | uh->dest, daddr, |
| 1774 | uh->source, saddr, |
| 1775 | dif, hnum)) { |
| 1776 | if (unlikely(count == ARRAY_SIZE(stack))) { |
| 1777 | flush_stack(stack, count, skb, ~0); |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1778 | inner_flushed = true; |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 1779 | count = 0; |
| 1780 | } |
| 1781 | stack[count++] = sk; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1782 | sock_hold(sk); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1783 | } |
| 1784 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1785 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1786 | spin_unlock(&hslot->lock); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1787 | |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1788 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
| 1789 | if (use_hash2 && hash2 != hash2_any) { |
| 1790 | hash2 = hash2_any; |
| 1791 | goto start_lookup; |
| 1792 | } |
| 1793 | |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1794 | /* |
| 1795 | * do the slow work with no lock held |
| 1796 | */ |
| 1797 | if (count) { |
| 1798 | flush_stack(stack, count, skb, count - 1); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1799 | } else { |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1800 | if (!inner_flushed) |
| 1801 | UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI, |
| 1802 | proto == IPPROTO_UDPLITE); |
| 1803 | consume_skb(skb); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1804 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1805 | return 0; |
| 1806 | } |
| 1807 | |
| 1808 | /* Initialize UDP checksum. If exited with zero value (success), |
| 1809 | * CHECKSUM_UNNECESSARY means, that no more checks are required. |
| 1810 | * Otherwise, csum completion requires chacksumming packet body, |
| 1811 | * including udp header and folding it to skb->csum. |
| 1812 | */ |
| 1813 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, |
| 1814 | int proto) |
| 1815 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1816 | int err; |
| 1817 | |
| 1818 | UDP_SKB_CB(skb)->partial_cov = 0; |
| 1819 | UDP_SKB_CB(skb)->cscov = skb->len; |
| 1820 | |
| 1821 | if (proto == IPPROTO_UDPLITE) { |
| 1822 | err = udplite_checksum_init(skb, uh); |
| 1823 | if (err) |
| 1824 | return err; |
| 1825 | } |
| 1826 | |
Tom Herbert | ed70fcf | 2014-05-02 16:29:38 -0700 | [diff] [blame] | 1827 | return skb_checksum_init_zero_check(skb, proto, uh->check, |
| 1828 | inet_compute_pseudo); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1829 | } |
| 1830 | |
| 1831 | /* |
| 1832 | * All we need to do is get the socket, and then do a checksum. |
| 1833 | */ |
| 1834 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1835 | 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] | 1836 | int proto) |
| 1837 | { |
| 1838 | struct sock *sk; |
Jesper Dangaard Brouer | 7b5e56f | 2009-02-05 15:05:45 -0800 | [diff] [blame] | 1839 | struct udphdr *uh; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1840 | unsigned short ulen; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1841 | struct rtable *rt = skb_rtable(skb); |
Jesper Dangaard Brouer | 2783ef2 | 2009-02-06 01:59:12 -0800 | [diff] [blame] | 1842 | __be32 saddr, daddr; |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1843 | struct net *net = dev_net(skb->dev); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1844 | |
| 1845 | /* |
| 1846 | * Validate the packet. |
| 1847 | */ |
| 1848 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
| 1849 | goto drop; /* No space for header. */ |
| 1850 | |
Jesper Dangaard Brouer | 7b5e56f | 2009-02-05 15:05:45 -0800 | [diff] [blame] | 1851 | uh = udp_hdr(skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1852 | ulen = ntohs(uh->len); |
Bjørn Mork | ccc2d97 | 2010-05-06 03:44:34 +0000 | [diff] [blame] | 1853 | saddr = ip_hdr(skb)->saddr; |
| 1854 | daddr = ip_hdr(skb)->daddr; |
| 1855 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1856 | if (ulen > skb->len) |
| 1857 | goto short_packet; |
| 1858 | |
| 1859 | if (proto == IPPROTO_UDP) { |
| 1860 | /* UDP validates ulen. */ |
| 1861 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) |
| 1862 | goto short_packet; |
| 1863 | uh = udp_hdr(skb); |
| 1864 | } |
| 1865 | |
| 1866 | if (udp4_csum_init(skb, uh, proto)) |
| 1867 | goto csum_error; |
| 1868 | |
Eric Dumazet | 8afdd99 | 2013-12-10 18:07:23 -0800 | [diff] [blame] | 1869 | sk = skb_steal_sock(skb); |
| 1870 | if (sk) { |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1871 | struct dst_entry *dst = skb_dst(skb); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1872 | int ret; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1873 | |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1874 | if (unlikely(sk->sk_rx_dst != dst)) |
| 1875 | udp_sk_rx_dst_set(sk, dst); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1876 | |
| 1877 | ret = udp_queue_rcv_skb(sk, skb); |
Eric Dumazet | 8afdd99 | 2013-12-10 18:07:23 -0800 | [diff] [blame] | 1878 | sock_put(sk); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1879 | /* a return value > 0 means to resubmit the input, but |
| 1880 | * it wants the return to be -protocol, or 0 |
| 1881 | */ |
| 1882 | if (ret > 0) |
| 1883 | return -ret; |
| 1884 | return 0; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1885 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1886 | |
Fabian Frederick | c18450a | 2014-11-04 20:48:41 +0100 | [diff] [blame] | 1887 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) |
| 1888 | return __udp4_lib_mcast_deliver(net, skb, uh, |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1889 | saddr, daddr, udptable, proto); |
Fabian Frederick | c18450a | 2014-11-04 20:48:41 +0100 | [diff] [blame] | 1890 | |
| 1891 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1892 | if (sk) { |
Eliezer Tamir | a5b5047 | 2013-06-10 11:40:00 +0300 | [diff] [blame] | 1893 | int ret; |
| 1894 | |
Tom Herbert | 224d019 | 2015-01-05 13:56:14 -0800 | [diff] [blame] | 1895 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 1896 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
| 1897 | inet_compute_pseudo); |
| 1898 | |
Eliezer Tamir | a5b5047 | 2013-06-10 11:40:00 +0300 | [diff] [blame] | 1899 | ret = udp_queue_rcv_skb(sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1900 | sock_put(sk); |
| 1901 | |
| 1902 | /* a return value > 0 means to resubmit the input, but |
| 1903 | * it wants the return to be -protocol, or 0 |
| 1904 | */ |
| 1905 | if (ret > 0) |
| 1906 | return -ret; |
| 1907 | return 0; |
| 1908 | } |
| 1909 | |
| 1910 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1911 | goto drop; |
| 1912 | nf_reset(skb); |
| 1913 | |
| 1914 | /* No socket. Drop packet silently, if checksum is wrong */ |
| 1915 | if (udp_lib_checksum_complete(skb)) |
| 1916 | goto csum_error; |
| 1917 | |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1918 | UDP_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1919 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
| 1920 | |
| 1921 | /* |
| 1922 | * Hmm. We got an UDP packet to a port to which we |
| 1923 | * don't wanna listen. Ignore it. |
| 1924 | */ |
| 1925 | kfree_skb(skb); |
| 1926 | return 0; |
| 1927 | |
| 1928 | short_packet: |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1929 | net_dbg_ratelimited("UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
| 1930 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
| 1931 | &saddr, ntohs(uh->source), |
| 1932 | ulen, skb->len, |
| 1933 | &daddr, ntohs(uh->dest)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1934 | goto drop; |
| 1935 | |
| 1936 | csum_error: |
| 1937 | /* |
| 1938 | * RFC1122: OK. Discards the bad packet silently (as far as |
| 1939 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). |
| 1940 | */ |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1941 | net_dbg_ratelimited("UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
| 1942 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
| 1943 | &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest), |
| 1944 | ulen); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1945 | UDP_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1946 | drop: |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1947 | UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1948 | kfree_skb(skb); |
| 1949 | return 0; |
| 1950 | } |
| 1951 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1952 | /* We can only early demux multicast if there is a single matching socket. |
| 1953 | * If more than one socket found returns NULL |
| 1954 | */ |
| 1955 | static struct sock *__udp4_lib_mcast_demux_lookup(struct net *net, |
| 1956 | __be16 loc_port, __be32 loc_addr, |
| 1957 | __be16 rmt_port, __be32 rmt_addr, |
| 1958 | int dif) |
| 1959 | { |
| 1960 | struct sock *sk, *result; |
| 1961 | struct hlist_nulls_node *node; |
| 1962 | unsigned short hnum = ntohs(loc_port); |
| 1963 | unsigned int count, slot = udp_hashfn(net, hnum, udp_table.mask); |
| 1964 | struct udp_hslot *hslot = &udp_table.hash[slot]; |
| 1965 | |
Eric Dumazet | 63c6f81 | 2014-06-12 16:13:06 -0700 | [diff] [blame] | 1966 | /* Do not bother scanning a too big list */ |
| 1967 | if (hslot->count > 10) |
| 1968 | return NULL; |
| 1969 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1970 | rcu_read_lock(); |
| 1971 | begin: |
| 1972 | count = 0; |
| 1973 | result = NULL; |
| 1974 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
| 1975 | if (__udp_is_mcast_sock(net, sk, |
| 1976 | loc_port, loc_addr, |
| 1977 | rmt_port, rmt_addr, |
| 1978 | dif, hnum)) { |
| 1979 | result = sk; |
| 1980 | ++count; |
| 1981 | } |
| 1982 | } |
| 1983 | /* |
| 1984 | * if the nulls value we got at the end of this lookup is |
| 1985 | * not the expected one, we must restart lookup. |
| 1986 | * We probably met an item that was moved to another chain. |
| 1987 | */ |
| 1988 | if (get_nulls_value(node) != slot) |
| 1989 | goto begin; |
| 1990 | |
| 1991 | if (result) { |
| 1992 | if (count != 1 || |
| 1993 | unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
| 1994 | result = NULL; |
Eric Dumazet | f69b923 | 2013-10-08 21:47:29 -0700 | [diff] [blame] | 1995 | else if (unlikely(!__udp_is_mcast_sock(net, result, |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1996 | loc_port, loc_addr, |
| 1997 | rmt_port, rmt_addr, |
| 1998 | dif, hnum))) { |
| 1999 | sock_put(result); |
| 2000 | result = NULL; |
| 2001 | } |
| 2002 | } |
| 2003 | rcu_read_unlock(); |
| 2004 | return result; |
| 2005 | } |
| 2006 | |
| 2007 | /* For unicast we should only early demux connected sockets or we can |
| 2008 | * break forwarding setups. The chains here can be long so only check |
| 2009 | * if the first socket is an exact match and if not move on. |
| 2010 | */ |
| 2011 | static struct sock *__udp4_lib_demux_lookup(struct net *net, |
| 2012 | __be16 loc_port, __be32 loc_addr, |
| 2013 | __be16 rmt_port, __be32 rmt_addr, |
| 2014 | int dif) |
| 2015 | { |
| 2016 | struct sock *sk, *result; |
| 2017 | struct hlist_nulls_node *node; |
| 2018 | unsigned short hnum = ntohs(loc_port); |
| 2019 | unsigned int hash2 = udp4_portaddr_hash(net, loc_addr, hnum); |
| 2020 | unsigned int slot2 = hash2 & udp_table.mask; |
| 2021 | struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; |
Joe Perches | c722831 | 2014-05-13 20:30:07 -0700 | [diff] [blame] | 2022 | INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2023 | const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); |
| 2024 | |
| 2025 | rcu_read_lock(); |
| 2026 | result = NULL; |
| 2027 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { |
| 2028 | if (INET_MATCH(sk, net, acookie, |
| 2029 | rmt_addr, loc_addr, ports, dif)) |
| 2030 | result = sk; |
| 2031 | /* Only check first socket in chain */ |
| 2032 | break; |
| 2033 | } |
| 2034 | |
| 2035 | if (result) { |
| 2036 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
| 2037 | result = NULL; |
| 2038 | else if (unlikely(!INET_MATCH(sk, net, acookie, |
| 2039 | rmt_addr, loc_addr, |
| 2040 | ports, dif))) { |
| 2041 | sock_put(result); |
| 2042 | result = NULL; |
| 2043 | } |
| 2044 | } |
| 2045 | rcu_read_unlock(); |
| 2046 | return result; |
| 2047 | } |
| 2048 | |
| 2049 | void udp_v4_early_demux(struct sk_buff *skb) |
| 2050 | { |
Eric Dumazet | 610438b | 2013-12-11 08:10:05 -0800 | [diff] [blame] | 2051 | struct net *net = dev_net(skb->dev); |
| 2052 | const struct iphdr *iph; |
| 2053 | const struct udphdr *uh; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2054 | struct sock *sk; |
| 2055 | struct dst_entry *dst; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2056 | int dif = skb->dev->ifindex; |
Shawn Bohrer | 6e54030 | 2015-06-03 16:27:38 -0500 | [diff] [blame] | 2057 | int ours; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2058 | |
| 2059 | /* validate the packet */ |
| 2060 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct udphdr))) |
| 2061 | return; |
| 2062 | |
Eric Dumazet | 610438b | 2013-12-11 08:10:05 -0800 | [diff] [blame] | 2063 | iph = ip_hdr(skb); |
| 2064 | uh = udp_hdr(skb); |
| 2065 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2066 | if (skb->pkt_type == PACKET_BROADCAST || |
Shawn Bohrer | 6e54030 | 2015-06-03 16:27:38 -0500 | [diff] [blame] | 2067 | skb->pkt_type == PACKET_MULTICAST) { |
| 2068 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
| 2069 | |
| 2070 | if (!in_dev) |
| 2071 | return; |
| 2072 | |
Paolo Abeni | ad0ea19 | 2016-03-22 09:19:38 +0100 | [diff] [blame] | 2073 | /* we are supposed to accept bcast packets */ |
| 2074 | if (skb->pkt_type == PACKET_MULTICAST) { |
| 2075 | ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr, |
| 2076 | iph->protocol); |
| 2077 | if (!ours) |
| 2078 | return; |
| 2079 | } |
| 2080 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2081 | sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr, |
| 2082 | uh->source, iph->saddr, dif); |
Shawn Bohrer | 6e54030 | 2015-06-03 16:27:38 -0500 | [diff] [blame] | 2083 | } else if (skb->pkt_type == PACKET_HOST) { |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2084 | sk = __udp4_lib_demux_lookup(net, uh->dest, iph->daddr, |
| 2085 | uh->source, iph->saddr, dif); |
Shawn Bohrer | 6e54030 | 2015-06-03 16:27:38 -0500 | [diff] [blame] | 2086 | } else { |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2087 | return; |
Shawn Bohrer | 6e54030 | 2015-06-03 16:27:38 -0500 | [diff] [blame] | 2088 | } |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2089 | |
| 2090 | if (!sk) |
| 2091 | return; |
| 2092 | |
| 2093 | skb->sk = sk; |
Alexander Duyck | 82eabd9 | 2014-09-04 13:32:11 -0400 | [diff] [blame] | 2094 | skb->destructor = sock_efree; |
Eric Dumazet | 10e2eb8 | 2015-08-01 12:14:33 +0200 | [diff] [blame] | 2095 | dst = READ_ONCE(sk->sk_rx_dst); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2096 | |
| 2097 | if (dst) |
| 2098 | dst = dst_check(dst, 0); |
Eric Dumazet | 10e2eb8 | 2015-08-01 12:14:33 +0200 | [diff] [blame] | 2099 | if (dst) { |
| 2100 | /* DST_NOCACHE can not be used without taking a reference */ |
| 2101 | if (dst->flags & DST_NOCACHE) { |
| 2102 | if (likely(atomic_inc_not_zero(&dst->__refcnt))) |
| 2103 | skb_dst_set(skb, dst); |
| 2104 | } else { |
| 2105 | skb_dst_set_noref(skb, dst); |
| 2106 | } |
| 2107 | } |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 2108 | } |
| 2109 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2110 | int udp_rcv(struct sk_buff *skb) |
| 2111 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2112 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2113 | } |
| 2114 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 2115 | void udp_destroy_sock(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2116 | { |
Tom Parkin | 44046a5 | 2013-03-19 06:11:12 +0000 | [diff] [blame] | 2117 | struct udp_sock *up = udp_sk(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 2118 | bool slow = lock_sock_fast(sk); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2119 | udp_flush_pending_frames(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 2120 | unlock_sock_fast(sk, slow); |
Tom Parkin | 44046a5 | 2013-03-19 06:11:12 +0000 | [diff] [blame] | 2121 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
| 2122 | void (*encap_destroy)(struct sock *sk); |
| 2123 | encap_destroy = ACCESS_ONCE(up->encap_destroy); |
| 2124 | if (encap_destroy) |
| 2125 | encap_destroy(sk); |
| 2126 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2127 | } |
| 2128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2129 | /* |
| 2130 | * Socket option code for UDP |
| 2131 | */ |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 2132 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2133 | char __user *optval, unsigned int optlen, |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 2134 | int (*push_pending_frames)(struct sock *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | { |
| 2136 | struct udp_sock *up = udp_sk(sk); |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2137 | int val, valbool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | int err = 0; |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 2139 | int is_udplite = IS_UDPLITE(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2141 | if (optlen < sizeof(int)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2142 | return -EINVAL; |
| 2143 | |
| 2144 | if (get_user(val, (int __user *)optval)) |
| 2145 | return -EFAULT; |
| 2146 | |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2147 | valbool = val ? 1 : 0; |
| 2148 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2149 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | case UDP_CORK: |
| 2151 | if (val != 0) { |
| 2152 | up->corkflag = 1; |
| 2153 | } else { |
| 2154 | up->corkflag = 0; |
| 2155 | lock_sock(sk); |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 2156 | push_pending_frames(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | release_sock(sk); |
| 2158 | } |
| 2159 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | case UDP_ENCAP: |
| 2162 | switch (val) { |
| 2163 | case 0: |
| 2164 | case UDP_ENCAP_ESPINUDP: |
| 2165 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
James Chapman | 067b207 | 2007-07-05 17:08:05 -0700 | [diff] [blame] | 2166 | up->encap_rcv = xfrm4_udp_encap_rcv; |
| 2167 | /* FALLTHROUGH */ |
James Chapman | 342f023 | 2007-06-27 15:37:46 -0700 | [diff] [blame] | 2168 | case UDP_ENCAP_L2TPINUDP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2169 | up->encap_type = val; |
Eric Dumazet | 447167b | 2012-04-11 23:05:28 +0000 | [diff] [blame] | 2170 | udp_encap_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | break; |
| 2172 | default: |
| 2173 | err = -ENOPROTOOPT; |
| 2174 | break; |
| 2175 | } |
| 2176 | break; |
| 2177 | |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2178 | case UDP_NO_CHECK6_TX: |
| 2179 | up->no_check6_tx = valbool; |
| 2180 | break; |
| 2181 | |
| 2182 | case UDP_NO_CHECK6_RX: |
| 2183 | up->no_check6_rx = valbool; |
| 2184 | break; |
| 2185 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2186 | /* |
| 2187 | * UDP-Lite's partial checksum coverage (RFC 3828). |
| 2188 | */ |
| 2189 | /* The sender sets actual checksum coverage length via this option. |
| 2190 | * The case coverage > packet length is handled by send module. */ |
| 2191 | case UDPLITE_SEND_CSCOV: |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 2192 | if (!is_udplite) /* Disable the option on UDP sockets */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2193 | return -ENOPROTOOPT; |
| 2194 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ |
| 2195 | val = 8; |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 2196 | else if (val > USHRT_MAX) |
| 2197 | val = USHRT_MAX; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2198 | up->pcslen = val; |
| 2199 | up->pcflag |= UDPLITE_SEND_CC; |
| 2200 | break; |
| 2201 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2202 | /* The receiver specifies a minimum checksum coverage value. To make |
| 2203 | * 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] | 2204 | * used, this again means full checksum coverage. */ |
| 2205 | case UDPLITE_RECV_CSCOV: |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 2206 | if (!is_udplite) /* Disable the option on UDP sockets */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2207 | return -ENOPROTOOPT; |
| 2208 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ |
| 2209 | val = 8; |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 2210 | else if (val > USHRT_MAX) |
| 2211 | val = USHRT_MAX; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2212 | up->pcrlen = val; |
| 2213 | up->pcflag |= UDPLITE_RECV_CC; |
| 2214 | break; |
| 2215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | default: |
| 2217 | err = -ENOPROTOOPT; |
| 2218 | break; |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2219 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2220 | |
| 2221 | return err; |
| 2222 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2223 | EXPORT_SYMBOL(udp_lib_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2225 | int udp_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2226 | char __user *optval, unsigned int optlen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2227 | { |
| 2228 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2229 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 2230 | udp_push_pending_frames); |
| 2231 | return ip_setsockopt(sk, level, optname, optval, optlen); |
| 2232 | } |
| 2233 | |
| 2234 | #ifdef CONFIG_COMPAT |
| 2235 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2236 | char __user *optval, unsigned int optlen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2237 | { |
| 2238 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2239 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 2240 | udp_push_pending_frames); |
| 2241 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
| 2242 | } |
| 2243 | #endif |
| 2244 | |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 2245 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
| 2246 | char __user *optval, int __user *optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | { |
| 2248 | struct udp_sock *up = udp_sk(sk); |
| 2249 | int val, len; |
| 2250 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2251 | if (get_user(len, optlen)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2252 | return -EFAULT; |
| 2253 | |
| 2254 | len = min_t(unsigned int, len, sizeof(int)); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2255 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2256 | if (len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | return -EINVAL; |
| 2258 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2259 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | case UDP_CORK: |
| 2261 | val = up->corkflag; |
| 2262 | break; |
| 2263 | |
| 2264 | case UDP_ENCAP: |
| 2265 | val = up->encap_type; |
| 2266 | break; |
| 2267 | |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2268 | case UDP_NO_CHECK6_TX: |
| 2269 | val = up->no_check6_tx; |
| 2270 | break; |
| 2271 | |
| 2272 | case UDP_NO_CHECK6_RX: |
| 2273 | val = up->no_check6_rx; |
| 2274 | break; |
| 2275 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2276 | /* The following two cannot be changed on UDP sockets, the return is |
| 2277 | * always 0 (which corresponds to the full checksum coverage of UDP). */ |
| 2278 | case UDPLITE_SEND_CSCOV: |
| 2279 | val = up->pcslen; |
| 2280 | break; |
| 2281 | |
| 2282 | case UDPLITE_RECV_CSCOV: |
| 2283 | val = up->pcrlen; |
| 2284 | break; |
| 2285 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | default: |
| 2287 | return -ENOPROTOOPT; |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2288 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2289 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2290 | if (put_user(len, optlen)) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2291 | return -EFAULT; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2292 | if (copy_to_user(optval, &val, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | return -EFAULT; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2294 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2296 | EXPORT_SYMBOL(udp_lib_getsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2297 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2298 | int udp_getsockopt(struct sock *sk, int level, int optname, |
| 2299 | char __user *optval, int __user *optlen) |
| 2300 | { |
| 2301 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2302 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| 2303 | return ip_getsockopt(sk, level, optname, optval, optlen); |
| 2304 | } |
| 2305 | |
| 2306 | #ifdef CONFIG_COMPAT |
| 2307 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, |
| 2308 | char __user *optval, int __user *optlen) |
| 2309 | { |
| 2310 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2311 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| 2312 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
| 2313 | } |
| 2314 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2315 | /** |
| 2316 | * udp_poll - wait for a UDP event. |
| 2317 | * @file - file struct |
| 2318 | * @sock - socket |
| 2319 | * @wait - poll table |
| 2320 | * |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2321 | * This is same as datagram poll, except for the special case of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | * blocking sockets. If application is using a blocking fd |
| 2323 | * and a packet with checksum error is in the queue; |
| 2324 | * then it could get return from select indicating data available |
| 2325 | * but then block when reading it. Add special case code |
| 2326 | * to work around these arguably broken applications. |
| 2327 | */ |
| 2328 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) |
| 2329 | { |
| 2330 | unsigned int mask = datagram_poll(file, sock, wait); |
| 2331 | struct sock *sk = sock->sk; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2332 | |
David Majnemer | c3f1dba | 2013-05-31 13:15:38 +0000 | [diff] [blame] | 2333 | sock_rps_record_flow(sk); |
| 2334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | /* Check for false positives due to checksum errors */ |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 2336 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
| 2337 | !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk)) |
| 2338 | mask &= ~(POLLIN | POLLRDNORM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2339 | |
| 2340 | return mask; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2343 | EXPORT_SYMBOL(udp_poll); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2344 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2345 | struct proto udp_prot = { |
| 2346 | .name = "UDP", |
| 2347 | .owner = THIS_MODULE, |
| 2348 | .close = udp_lib_close, |
| 2349 | .connect = ip4_datagram_connect, |
| 2350 | .disconnect = udp_disconnect, |
| 2351 | .ioctl = udp_ioctl, |
| 2352 | .destroy = udp_destroy_sock, |
| 2353 | .setsockopt = udp_setsockopt, |
| 2354 | .getsockopt = udp_getsockopt, |
| 2355 | .sendmsg = udp_sendmsg, |
| 2356 | .recvmsg = udp_recvmsg, |
| 2357 | .sendpage = udp_sendpage, |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 2358 | .backlog_rcv = __udp_queue_rcv_skb, |
Steffen Klassert | 8141ed9 | 2013-01-21 02:00:03 +0000 | [diff] [blame] | 2359 | .release_cb = ip4_datagram_release_cb, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2360 | .hash = udp_lib_hash, |
| 2361 | .unhash = udp_lib_unhash, |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 2362 | .rehash = udp_v4_rehash, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2363 | .get_port = udp_v4_get_port, |
| 2364 | .memory_allocated = &udp_memory_allocated, |
| 2365 | .sysctl_mem = sysctl_udp_mem, |
| 2366 | .sysctl_wmem = &sysctl_udp_wmem_min, |
| 2367 | .sysctl_rmem = &sysctl_udp_rmem_min, |
| 2368 | .obj_size = sizeof(struct udp_sock), |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 2369 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2370 | .h.udp_table = &udp_table, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2371 | #ifdef CONFIG_COMPAT |
| 2372 | .compat_setsockopt = compat_udp_setsockopt, |
| 2373 | .compat_getsockopt = compat_udp_getsockopt, |
| 2374 | #endif |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 2375 | .clear_sk = sk_prot_clear_portaddr_nulls, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2376 | }; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2377 | EXPORT_SYMBOL(udp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2378 | |
| 2379 | /* ------------------------------------------------------------------------ */ |
| 2380 | #ifdef CONFIG_PROC_FS |
| 2381 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2382 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | { |
| 2384 | struct sock *sk; |
| 2385 | struct udp_iter_state *state = seq->private; |
Denis V. Lunev | 6f191ef | 2008-03-28 18:23:33 -0700 | [diff] [blame] | 2386 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2387 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2388 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
| 2389 | ++state->bucket) { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 2390 | struct hlist_nulls_node *node; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2391 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2392 | |
| 2393 | if (hlist_nulls_empty(&hslot->head)) |
| 2394 | continue; |
| 2395 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2396 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 2397 | sk_nulls_for_each(sk, node, &hslot->head) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2398 | if (!net_eq(sock_net(sk), net)) |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2399 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2400 | if (sk->sk_family == state->family) |
| 2401 | goto found; |
| 2402 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2403 | spin_unlock_bh(&hslot->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | } |
| 2405 | sk = NULL; |
| 2406 | found: |
| 2407 | return sk; |
| 2408 | } |
| 2409 | |
| 2410 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) |
| 2411 | { |
| 2412 | struct udp_iter_state *state = seq->private; |
Denis V. Lunev | 6f191ef | 2008-03-28 18:23:33 -0700 | [diff] [blame] | 2413 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2414 | |
| 2415 | do { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 2416 | sk = sk_nulls_next(sk); |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2417 | } 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] | 2418 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2419 | if (!sk) { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2420 | if (state->bucket <= state->udp_table->mask) |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 2421 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2422 | return udp_get_first(seq, state->bucket + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2423 | } |
| 2424 | return sk; |
| 2425 | } |
| 2426 | |
| 2427 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) |
| 2428 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2429 | struct sock *sk = udp_get_first(seq, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | |
| 2431 | if (sk) |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2432 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | --pos; |
| 2434 | return pos ? NULL : sk; |
| 2435 | } |
| 2436 | |
| 2437 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) |
| 2438 | { |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 2439 | struct udp_iter_state *state = seq->private; |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2440 | state->bucket = MAX_UDP_PORTS; |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 2441 | |
YOSHIFUJI Hideaki | b50660f | 2008-03-31 19:38:15 -0700 | [diff] [blame] | 2442 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | } |
| 2444 | |
| 2445 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2446 | { |
| 2447 | struct sock *sk; |
| 2448 | |
YOSHIFUJI Hideaki | b50660f | 2008-03-31 19:38:15 -0700 | [diff] [blame] | 2449 | if (v == SEQ_START_TOKEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | sk = udp_get_idx(seq, 0); |
| 2451 | else |
| 2452 | sk = udp_get_next(seq, v); |
| 2453 | |
| 2454 | ++*pos; |
| 2455 | return sk; |
| 2456 | } |
| 2457 | |
| 2458 | static void udp_seq_stop(struct seq_file *seq, void *v) |
| 2459 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2460 | struct udp_iter_state *state = seq->private; |
| 2461 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2462 | if (state->bucket <= state->udp_table->mask) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2463 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | } |
| 2465 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2466 | int udp_seq_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2467 | { |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 2468 | struct udp_seq_afinfo *afinfo = PDE_DATA(inode); |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2469 | struct udp_iter_state *s; |
| 2470 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2471 | |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2472 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
| 2473 | sizeof(struct udp_iter_state)); |
| 2474 | if (err < 0) |
| 2475 | return err; |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2476 | |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2477 | s = ((struct seq_file *)file->private_data)->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2478 | s->family = afinfo->family; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2479 | s->udp_table = afinfo->udp_table; |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2480 | return err; |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2481 | } |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2482 | EXPORT_SYMBOL(udp_seq_open); |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | /* ------------------------------------------------------------------------ */ |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 2485 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2486 | { |
| 2487 | struct proc_dir_entry *p; |
| 2488 | int rc = 0; |
| 2489 | |
Denis V. Lunev | dda6192 | 2008-03-28 18:24:26 -0700 | [diff] [blame] | 2490 | afinfo->seq_ops.start = udp_seq_start; |
| 2491 | afinfo->seq_ops.next = udp_seq_next; |
| 2492 | afinfo->seq_ops.stop = udp_seq_stop; |
| 2493 | |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2494 | 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] | 2495 | afinfo->seq_fops, afinfo); |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2496 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2497 | rc = -ENOMEM; |
| 2498 | return rc; |
| 2499 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2500 | EXPORT_SYMBOL(udp_proc_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 2502 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2503 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 2504 | remove_proc_entry(afinfo->name, net->proc_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2505 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2506 | EXPORT_SYMBOL(udp_proc_unregister); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2507 | |
| 2508 | /* ------------------------------------------------------------------------ */ |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2509 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2510 | int bucket) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2511 | { |
| 2512 | struct inet_sock *inet = inet_sk(sp); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2513 | __be32 dest = inet->inet_daddr; |
| 2514 | __be32 src = inet->inet_rcv_saddr; |
| 2515 | __u16 destp = ntohs(inet->inet_dport); |
| 2516 | __u16 srcp = ntohs(inet->inet_sport); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2517 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2518 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2519 | " %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] | 2520 | bucket, src, srcp, dest, destp, sp->sk_state, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 2521 | sk_wmem_alloc_get(sp), |
| 2522 | sk_rmem_alloc_get(sp), |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2523 | 0, 0L, 0, |
| 2524 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), |
| 2525 | 0, sock_i_ino(sp), |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 2526 | atomic_read(&sp->sk_refcnt), sp, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2527 | atomic_read(&sp->sk_drops)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2528 | } |
| 2529 | |
| 2530 | int udp4_seq_show(struct seq_file *seq, void *v) |
| 2531 | { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2532 | seq_setwidth(seq, 127); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2533 | if (v == SEQ_START_TOKEN) |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2534 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2535 | "rx_queue tr tm->when retrnsmt uid timeout " |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 2536 | "inode ref pointer drops"); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2537 | else { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2538 | struct udp_iter_state *state = seq->private; |
| 2539 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2540 | udp4_format_sock(v, seq, state->bucket); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2541 | } |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2542 | seq_pad(seq, '\n'); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2543 | return 0; |
| 2544 | } |
| 2545 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2546 | static const struct file_operations udp_afinfo_seq_fops = { |
| 2547 | .owner = THIS_MODULE, |
| 2548 | .open = udp_seq_open, |
| 2549 | .read = seq_read, |
| 2550 | .llseek = seq_lseek, |
| 2551 | .release = seq_release_net |
| 2552 | }; |
| 2553 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2554 | /* ------------------------------------------------------------------------ */ |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2555 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2556 | .name = "udp", |
| 2557 | .family = AF_INET, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2558 | .udp_table = &udp_table, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2559 | .seq_fops = &udp_afinfo_seq_fops, |
Denis V. Lunev | dda6192 | 2008-03-28 18:24:26 -0700 | [diff] [blame] | 2560 | .seq_ops = { |
| 2561 | .show = udp4_seq_show, |
| 2562 | }, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2563 | }; |
| 2564 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2565 | static int __net_init udp4_proc_init_net(struct net *net) |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2566 | { |
| 2567 | return udp_proc_register(net, &udp4_seq_afinfo); |
| 2568 | } |
| 2569 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2570 | static void __net_exit udp4_proc_exit_net(struct net *net) |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2571 | { |
| 2572 | udp_proc_unregister(net, &udp4_seq_afinfo); |
| 2573 | } |
| 2574 | |
| 2575 | static struct pernet_operations udp4_net_ops = { |
| 2576 | .init = udp4_proc_init_net, |
| 2577 | .exit = udp4_proc_exit_net, |
| 2578 | }; |
| 2579 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2580 | int __init udp4_proc_init(void) |
| 2581 | { |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2582 | return register_pernet_subsys(&udp4_net_ops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2583 | } |
| 2584 | |
| 2585 | void udp4_proc_exit(void) |
| 2586 | { |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2587 | unregister_pernet_subsys(&udp4_net_ops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2588 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2589 | #endif /* CONFIG_PROC_FS */ |
| 2590 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2591 | static __initdata unsigned long uhash_entries; |
| 2592 | static int __init set_uhash_entries(char *str) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2593 | { |
Eldad Zack | 413c27d | 2012-05-19 14:13:18 +0000 | [diff] [blame] | 2594 | ssize_t ret; |
| 2595 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2596 | if (!str) |
| 2597 | return 0; |
Eldad Zack | 413c27d | 2012-05-19 14:13:18 +0000 | [diff] [blame] | 2598 | |
| 2599 | ret = kstrtoul(str, 0, &uhash_entries); |
| 2600 | if (ret) |
| 2601 | return 0; |
| 2602 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2603 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) |
| 2604 | uhash_entries = UDP_HTABLE_SIZE_MIN; |
| 2605 | return 1; |
| 2606 | } |
| 2607 | __setup("uhash_entries=", set_uhash_entries); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2608 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2609 | void __init udp_table_init(struct udp_table *table, const char *name) |
| 2610 | { |
| 2611 | unsigned int i; |
| 2612 | |
Tim Bird | 31fe62b | 2012-05-23 13:33:35 +0000 | [diff] [blame] | 2613 | table->hash = alloc_large_system_hash(name, |
| 2614 | 2 * sizeof(struct udp_hslot), |
| 2615 | uhash_entries, |
| 2616 | 21, /* one slot per 2 MB */ |
| 2617 | 0, |
| 2618 | &table->log, |
| 2619 | &table->mask, |
| 2620 | UDP_HTABLE_SIZE_MIN, |
| 2621 | 64 * 1024); |
| 2622 | |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2623 | table->hash2 = table->hash + (table->mask + 1); |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2624 | for (i = 0; i <= table->mask; i++) { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 2625 | INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i); |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 2626 | table->hash[i].count = 0; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2627 | spin_lock_init(&table->hash[i].lock); |
| 2628 | } |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2629 | for (i = 0; i <= table->mask; i++) { |
| 2630 | INIT_HLIST_NULLS_HEAD(&table->hash2[i].head, i); |
| 2631 | table->hash2[i].count = 0; |
| 2632 | spin_lock_init(&table->hash2[i].lock); |
| 2633 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2634 | } |
| 2635 | |
Tom Herbert | 723b8e4 | 2015-02-24 09:17:31 -0800 | [diff] [blame] | 2636 | u32 udp_flow_hashrnd(void) |
| 2637 | { |
| 2638 | static u32 hashrnd __read_mostly; |
| 2639 | |
| 2640 | net_get_random_once(&hashrnd, sizeof(hashrnd)); |
| 2641 | |
| 2642 | return hashrnd; |
| 2643 | } |
| 2644 | EXPORT_SYMBOL(udp_flow_hashrnd); |
| 2645 | |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2646 | void __init udp_init(void) |
| 2647 | { |
Eric Dumazet | f03d78d | 2011-07-07 00:27:05 -0700 | [diff] [blame] | 2648 | unsigned long limit; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2649 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2650 | udp_table_init(&udp_table, "UDP"); |
Eric Dumazet | f03d78d | 2011-07-07 00:27:05 -0700 | [diff] [blame] | 2651 | limit = nr_free_buffer_pages() / 8; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2652 | limit = max(limit, 128UL); |
| 2653 | sysctl_udp_mem[0] = limit / 4 * 3; |
| 2654 | sysctl_udp_mem[1] = limit; |
| 2655 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; |
| 2656 | |
| 2657 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; |
| 2658 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; |
| 2659 | } |