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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | #include <linux/in.h> |
| 94 | #include <linux/errno.h> |
| 95 | #include <linux/timer.h> |
| 96 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | #include <linux/inet.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | #include <linux/netdevice.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 99 | #include <linux/slab.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 100 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | #include <linux/skbuff.h> |
Tom Herbert | 57c67ff | 2014-08-22 13:34:44 -0700 | [diff] [blame] | 102 | #include <linux/netdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 117 | struct udp_table udp_table __read_mostly; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 118 | EXPORT_SYMBOL(udp_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 120 | long sysctl_udp_mem[3] __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 121 | EXPORT_SYMBOL(sysctl_udp_mem); |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 122 | |
| 123 | int sysctl_udp_rmem_min __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 124 | EXPORT_SYMBOL(sysctl_udp_rmem_min); |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 125 | |
| 126 | int sysctl_udp_wmem_min __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 127 | EXPORT_SYMBOL(sysctl_udp_wmem_min); |
| 128 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 129 | atomic_long_t udp_memory_allocated; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 130 | EXPORT_SYMBOL(udp_memory_allocated); |
| 131 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 132 | #define MAX_UDP_PORTS 65536 |
| 133 | #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN) |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 134 | |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 135 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 136 | const struct udp_hslot *hslot, |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 137 | unsigned long *bitmap, |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 138 | struct sock *sk, |
| 139 | int (*saddr_comp)(const struct sock *sk1, |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 140 | const struct sock *sk2), |
| 141 | unsigned int log) |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 142 | { |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 143 | struct sock *sk2; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 144 | struct hlist_nulls_node *node; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 145 | kuid_t uid = sock_i_uid(sk); |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 146 | |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 147 | sk_nulls_for_each(sk2, node, &hslot->head) { |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 148 | if (net_eq(sock_net(sk2), net) && |
| 149 | sk2 != sk && |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 150 | (bitmap || udp_sk(sk2)->udp_port_hash == num) && |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 151 | (!sk2->sk_reuse || !sk->sk_reuse) && |
| 152 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || |
| 153 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 154 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 155 | !uid_eq(uid, sock_i_uid(sk2))) && |
| 156 | saddr_comp(sk, sk2)) { |
| 157 | if (!bitmap) |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 158 | return 1; |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 159 | __set_bit(udp_sk(sk2)->udp_port_hash >> log, bitmap); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 160 | } |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 161 | } |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 162 | return 0; |
| 163 | } |
| 164 | |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 165 | /* |
| 166 | * Note: we still hold spinlock of primary hash chain, so no other writer |
| 167 | * can insert/delete a socket with local_port == num |
| 168 | */ |
| 169 | static int udp_lib_lport_inuse2(struct net *net, __u16 num, |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 170 | struct udp_hslot *hslot2, |
| 171 | struct sock *sk, |
| 172 | int (*saddr_comp)(const struct sock *sk1, |
| 173 | const struct sock *sk2)) |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 174 | { |
| 175 | struct sock *sk2; |
| 176 | struct hlist_nulls_node *node; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 177 | kuid_t uid = sock_i_uid(sk); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 178 | int res = 0; |
| 179 | |
| 180 | spin_lock(&hslot2->lock); |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 181 | udp_portaddr_for_each_entry(sk2, node, &hslot2->head) { |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 182 | if (net_eq(sock_net(sk2), net) && |
| 183 | sk2 != sk && |
| 184 | (udp_sk(sk2)->udp_port_hash == num) && |
| 185 | (!sk2->sk_reuse || !sk->sk_reuse) && |
| 186 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || |
| 187 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 188 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 189 | !uid_eq(uid, sock_i_uid(sk2))) && |
| 190 | saddr_comp(sk, sk2)) { |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 191 | res = 1; |
| 192 | break; |
| 193 | } |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 194 | } |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 195 | spin_unlock(&hslot2->lock); |
| 196 | return res; |
| 197 | } |
| 198 | |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 199 | /** |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 200 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 201 | * |
| 202 | * @sk: socket struct in question |
| 203 | * @snum: port number to look up |
David S. Miller | df2bc45 | 2007-06-05 15:18:43 -0700 | [diff] [blame] | 204 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 205 | * @hash2_nulladdr: AF-dependent hash value in secondary hash chains, |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 206 | * with NULL address |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 207 | */ |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 208 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 209 | int (*saddr_comp)(const struct sock *sk1, |
| 210 | const struct sock *sk2), |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 211 | unsigned int hash2_nulladdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | { |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 213 | struct udp_hslot *hslot, *hslot2; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 214 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 215 | int error = 1; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 216 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Stephen Hemminger | 32c1da7 | 2007-08-24 23:09:41 -0700 | [diff] [blame] | 218 | if (!snum) { |
Eric Dumazet | 9088c56 | 2008-10-08 11:44:17 -0700 | [diff] [blame] | 219 | int low, high, remaining; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 220 | unsigned int rand; |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 221 | unsigned short first, last; |
| 222 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
Eric W. Biederman | 0bbf87d | 2013-09-28 14:10:59 -0700 | [diff] [blame] | 224 | inet_get_local_port_range(net, &low, &high); |
Anton Arapov | a25de53 | 2007-10-18 22:00:17 -0700 | [diff] [blame] | 225 | remaining = (high - low) + 1; |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 226 | |
Aruna-Hewapathirane | 63862b5 | 2014-01-11 07:15:59 -0500 | [diff] [blame] | 227 | rand = prandom_u32(); |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 228 | first = reciprocal_scale(rand, remaining) + low; |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 229 | /* |
| 230 | * force rand to be an odd multiple of UDP_HTABLE_SIZE |
| 231 | */ |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 232 | rand = (rand | 1) * (udptable->mask + 1); |
Eric Dumazet | 5781b23 | 2009-12-13 19:32:39 -0800 | [diff] [blame] | 233 | last = first + udptable->mask + 1; |
| 234 | do { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 235 | hslot = udp_hashslot(udptable, net, first); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 236 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 237 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 238 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 239 | saddr_comp, udptable->log); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 240 | |
| 241 | snum = first; |
| 242 | /* |
| 243 | * Iterate on all possible values of snum for this hash. |
| 244 | * Using steps of an odd multiple of UDP_HTABLE_SIZE |
| 245 | * give us randomization and full range coverage. |
| 246 | */ |
Eric Dumazet | 9088c56 | 2008-10-08 11:44:17 -0700 | [diff] [blame] | 247 | do { |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 248 | if (low <= snum && snum <= high && |
Amerigo Wang | e3826f1 | 2010-05-05 00:27:06 +0000 | [diff] [blame] | 249 | !test_bit(snum >> udptable->log, bitmap) && |
WANG Cong | 122ff24 | 2014-05-12 16:04:53 -0700 | [diff] [blame] | 250 | !inet_is_local_reserved_port(net, snum)) |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 251 | goto found; |
| 252 | snum += rand; |
| 253 | } while (snum != first); |
| 254 | spin_unlock_bh(&hslot->lock); |
Eric Dumazet | 5781b23 | 2009-12-13 19:32:39 -0800 | [diff] [blame] | 255 | } while (++first != last); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 256 | goto fail; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 257 | } else { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 258 | hslot = udp_hashslot(udptable, net, snum); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 259 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 260 | if (hslot->count > 10) { |
| 261 | int exist; |
| 262 | unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum; |
| 263 | |
| 264 | slot2 &= udptable->mask; |
| 265 | hash2_nulladdr &= udptable->mask; |
| 266 | |
| 267 | hslot2 = udp_hashslot2(udptable, slot2); |
| 268 | if (hslot->count < hslot2->count) |
| 269 | goto scan_primary_hash; |
| 270 | |
| 271 | exist = udp_lib_lport_inuse2(net, snum, hslot2, |
| 272 | sk, saddr_comp); |
| 273 | if (!exist && (hash2_nulladdr != slot2)) { |
| 274 | hslot2 = udp_hashslot2(udptable, hash2_nulladdr); |
| 275 | exist = udp_lib_lport_inuse2(net, snum, hslot2, |
| 276 | sk, saddr_comp); |
| 277 | } |
| 278 | if (exist) |
| 279 | goto fail_unlock; |
| 280 | else |
| 281 | goto found; |
| 282 | } |
| 283 | scan_primary_hash: |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 284 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, |
| 285 | saddr_comp, 0)) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 286 | goto fail_unlock; |
| 287 | } |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 288 | found: |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 289 | inet_sk(sk)->inet_num = snum; |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 290 | udp_sk(sk)->udp_port_hash = snum; |
| 291 | udp_sk(sk)->udp_portaddr_hash ^= snum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | if (sk_unhashed(sk)) { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 293 | sk_nulls_add_node_rcu(sk, &hslot->head); |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 294 | hslot->count++; |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 295 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 296 | |
| 297 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
| 298 | spin_lock(&hslot2->lock); |
| 299 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
| 300 | &hslot2->head); |
| 301 | hslot2->count++; |
| 302 | spin_unlock(&hslot2->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 304 | error = 0; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 305 | fail_unlock: |
| 306 | spin_unlock_bh(&hslot->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | fail: |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 308 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 310 | EXPORT_SYMBOL(udp_lib_get_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
Vlad Yasevich | 499923c | 2009-04-09 17:37:33 +0000 | [diff] [blame] | 312 | static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 313 | { |
| 314 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); |
| 315 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 316 | return (!ipv6_only_sock(sk2) && |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 317 | (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr || |
| 318 | inet1->inet_rcv_saddr == inet2->inet_rcv_saddr)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 319 | } |
| 320 | |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 321 | static u32 udp4_portaddr_hash(const struct net *net, __be32 saddr, |
| 322 | unsigned int port) |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 323 | { |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 324 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 325 | } |
| 326 | |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 327 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 328 | { |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 329 | unsigned int hash2_nulladdr = |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 330 | udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 331 | unsigned int hash2_partial = |
| 332 | udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0); |
| 333 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 334 | /* precompute partial secondary hash */ |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 335 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
| 336 | 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] | 337 | } |
| 338 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 339 | static inline int compute_score(struct sock *sk, struct net *net, |
| 340 | __be32 saddr, unsigned short hnum, __be16 sport, |
| 341 | __be32 daddr, __be16 dport, int dif) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 342 | { |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 343 | int score; |
| 344 | struct inet_sock *inet; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 345 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 346 | if (!net_eq(sock_net(sk), net) || |
| 347 | udp_sk(sk)->udp_port_hash != hnum || |
| 348 | ipv6_only_sock(sk)) |
| 349 | return -1; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 350 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 351 | score = (sk->sk_family == PF_INET) ? 2 : 1; |
| 352 | inet = inet_sk(sk); |
| 353 | |
| 354 | if (inet->inet_rcv_saddr) { |
| 355 | if (inet->inet_rcv_saddr != daddr) |
| 356 | return -1; |
| 357 | score += 4; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 358 | } |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 359 | |
| 360 | if (inet->inet_daddr) { |
| 361 | if (inet->inet_daddr != saddr) |
| 362 | return -1; |
| 363 | score += 4; |
| 364 | } |
| 365 | |
| 366 | if (inet->inet_dport) { |
| 367 | if (inet->inet_dport != sport) |
| 368 | return -1; |
| 369 | score += 4; |
| 370 | } |
| 371 | |
| 372 | if (sk->sk_bound_dev_if) { |
| 373 | if (sk->sk_bound_dev_if != dif) |
| 374 | return -1; |
| 375 | score += 4; |
| 376 | } |
| 377 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 378 | return score; |
| 379 | } |
| 380 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 381 | /* |
| 382 | * In this second variant, we check (daddr, dport) matches (inet_rcv_sadd, inet_num) |
| 383 | */ |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 384 | static inline int compute_score2(struct sock *sk, struct net *net, |
| 385 | __be32 saddr, __be16 sport, |
| 386 | __be32 daddr, unsigned int hnum, int dif) |
| 387 | { |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 388 | int score; |
| 389 | struct inet_sock *inet; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 390 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 391 | if (!net_eq(sock_net(sk), net) || |
| 392 | ipv6_only_sock(sk)) |
| 393 | return -1; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 394 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 395 | inet = inet_sk(sk); |
| 396 | |
| 397 | if (inet->inet_rcv_saddr != daddr || |
| 398 | inet->inet_num != hnum) |
| 399 | return -1; |
| 400 | |
| 401 | score = (sk->sk_family == PF_INET) ? 2 : 1; |
| 402 | |
| 403 | if (inet->inet_daddr) { |
| 404 | if (inet->inet_daddr != saddr) |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 405 | return -1; |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 406 | score += 4; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 407 | } |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 408 | |
| 409 | if (inet->inet_dport) { |
| 410 | if (inet->inet_dport != sport) |
| 411 | return -1; |
| 412 | score += 4; |
| 413 | } |
| 414 | |
| 415 | if (sk->sk_bound_dev_if) { |
| 416 | if (sk->sk_bound_dev_if != dif) |
| 417 | return -1; |
| 418 | score += 4; |
| 419 | } |
| 420 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 421 | return score; |
| 422 | } |
| 423 | |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 424 | static u32 udp_ehashfn(const struct net *net, const __be32 laddr, |
| 425 | const __u16 lport, const __be32 faddr, |
| 426 | const __be16 fport) |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 427 | { |
Hannes Frederic Sowa | 1bbdcee | 2013-10-19 21:48:57 +0200 | [diff] [blame] | 428 | static u32 udp_ehash_secret __read_mostly; |
| 429 | |
| 430 | net_get_random_once(&udp_ehash_secret, sizeof(udp_ehash_secret)); |
| 431 | |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 432 | return __inet_ehashfn(laddr, lport, faddr, fport, |
Hannes Frederic Sowa | 1bbdcee | 2013-10-19 21:48:57 +0200 | [diff] [blame] | 433 | udp_ehash_secret + net_hash_mix(net)); |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 434 | } |
| 435 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 436 | /* called with read_rcu_lock() */ |
| 437 | static struct sock *udp4_lib_lookup2(struct net *net, |
| 438 | __be32 saddr, __be16 sport, |
| 439 | __be32 daddr, unsigned int hnum, int dif, |
| 440 | struct udp_hslot *hslot2, unsigned int slot2) |
| 441 | { |
| 442 | struct sock *sk, *result; |
| 443 | struct hlist_nulls_node *node; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 444 | int score, badness, matches = 0, reuseport = 0; |
| 445 | u32 hash = 0; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 446 | |
| 447 | begin: |
| 448 | result = NULL; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 449 | badness = 0; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 450 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { |
| 451 | score = compute_score2(sk, net, saddr, sport, |
| 452 | daddr, hnum, dif); |
| 453 | if (score > badness) { |
| 454 | result = sk; |
| 455 | badness = score; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 456 | reuseport = sk->sk_reuseport; |
| 457 | if (reuseport) { |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 458 | hash = udp_ehashfn(net, daddr, hnum, |
| 459 | saddr, sport); |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 460 | matches = 1; |
| 461 | } |
| 462 | } else if (score == badness && reuseport) { |
| 463 | matches++; |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 464 | if (reciprocal_scale(hash, matches) == 0) |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 465 | result = sk; |
| 466 | hash = next_pseudo_random32(hash); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 467 | } |
| 468 | } |
| 469 | /* |
| 470 | * if the nulls value we got at the end of this lookup is |
| 471 | * not the expected one, we must restart lookup. |
| 472 | * We probably met an item that was moved to another chain. |
| 473 | */ |
| 474 | if (get_nulls_value(node) != slot2) |
| 475 | goto begin; |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 476 | if (result) { |
Eric Dumazet | c31504d | 2010-11-15 19:58:26 +0000 | [diff] [blame] | 477 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 478 | result = NULL; |
| 479 | else if (unlikely(compute_score2(result, net, saddr, sport, |
| 480 | daddr, hnum, dif) < badness)) { |
| 481 | sock_put(result); |
| 482 | goto begin; |
| 483 | } |
| 484 | } |
| 485 | return result; |
| 486 | } |
| 487 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 488 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
| 489 | * harder than this. -DaveM |
| 490 | */ |
Pavel Emelyanov | fce8233 | 2011-12-09 06:23:34 +0000 | [diff] [blame] | 491 | struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 492 | __be16 sport, __be32 daddr, __be16 dport, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 493 | int dif, struct udp_table *udptable) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 494 | { |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 495 | struct sock *sk, *result; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 496 | struct hlist_nulls_node *node; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 497 | unsigned short hnum = ntohs(dport); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 498 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
| 499 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 500 | int score, badness, matches = 0, reuseport = 0; |
| 501 | u32 hash = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 502 | |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 503 | rcu_read_lock(); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 504 | if (hslot->count > 10) { |
| 505 | hash2 = udp4_portaddr_hash(net, daddr, hnum); |
| 506 | slot2 = hash2 & udptable->mask; |
| 507 | hslot2 = &udptable->hash2[slot2]; |
| 508 | if (hslot->count < hslot2->count) |
| 509 | goto begin; |
| 510 | |
| 511 | result = udp4_lib_lookup2(net, saddr, sport, |
| 512 | daddr, hnum, dif, |
| 513 | hslot2, slot2); |
| 514 | if (!result) { |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 515 | hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 516 | slot2 = hash2 & udptable->mask; |
| 517 | hslot2 = &udptable->hash2[slot2]; |
| 518 | if (hslot->count < hslot2->count) |
| 519 | goto begin; |
| 520 | |
Jorge Boncompte [DTI2] | 1223c67 | 2010-04-08 04:56:48 +0000 | [diff] [blame] | 521 | result = udp4_lib_lookup2(net, saddr, sport, |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 522 | htonl(INADDR_ANY), hnum, dif, |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 523 | hslot2, slot2); |
| 524 | } |
| 525 | rcu_read_unlock(); |
| 526 | return result; |
| 527 | } |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 528 | begin: |
| 529 | result = NULL; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 530 | badness = 0; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 531 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 532 | score = compute_score(sk, net, saddr, hnum, sport, |
| 533 | daddr, dport, dif); |
| 534 | if (score > badness) { |
| 535 | result = sk; |
| 536 | badness = score; |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 537 | reuseport = sk->sk_reuseport; |
| 538 | if (reuseport) { |
Hannes Frederic Sowa | 65cd803 | 2013-10-19 21:48:51 +0200 | [diff] [blame] | 539 | hash = udp_ehashfn(net, daddr, hnum, |
| 540 | saddr, sport); |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 541 | matches = 1; |
| 542 | } |
| 543 | } else if (score == badness && reuseport) { |
| 544 | matches++; |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 545 | if (reciprocal_scale(hash, matches) == 0) |
Tom Herbert | ba418fa | 2013-01-22 09:50:32 +0000 | [diff] [blame] | 546 | result = sk; |
| 547 | hash = next_pseudo_random32(hash); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 548 | } |
| 549 | } |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 550 | /* |
| 551 | * if the nulls value we got at the end of this lookup is |
| 552 | * not the expected one, we must restart lookup. |
| 553 | * We probably met an item that was moved to another chain. |
| 554 | */ |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 555 | if (get_nulls_value(node) != slot) |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 556 | goto begin; |
| 557 | |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 558 | if (result) { |
Eric Dumazet | c31504d | 2010-11-15 19:58:26 +0000 | [diff] [blame] | 559 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 560 | result = NULL; |
| 561 | else if (unlikely(compute_score(result, net, saddr, hnum, sport, |
| 562 | daddr, dport, dif) < badness)) { |
| 563 | sock_put(result); |
| 564 | goto begin; |
| 565 | } |
| 566 | } |
| 567 | rcu_read_unlock(); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 568 | return result; |
| 569 | } |
Pavel Emelyanov | fce8233 | 2011-12-09 06:23:34 +0000 | [diff] [blame] | 570 | EXPORT_SYMBOL_GPL(__udp4_lib_lookup); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 571 | |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 572 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
| 573 | __be16 sport, __be16 dport, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 574 | struct udp_table *udptable) |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 575 | { |
| 576 | const struct iphdr *iph = ip_hdr(skb); |
| 577 | |
Eric Dumazet | 8afdd99 | 2013-12-10 18:07:23 -0800 | [diff] [blame] | 578 | return __udp4_lib_lookup(dev_net(skb_dst(skb)->dev), iph->saddr, sport, |
| 579 | iph->daddr, dport, inet_iif(skb), |
| 580 | udptable); |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 581 | } |
| 582 | |
KOVACS Krisztian | bcd4130 | 2008-10-01 07:48:10 -0700 | [diff] [blame] | 583 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
| 584 | __be32 daddr, __be16 dport, int dif) |
| 585 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 586 | return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); |
KOVACS Krisztian | bcd4130 | 2008-10-01 07:48:10 -0700 | [diff] [blame] | 587 | } |
| 588 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); |
| 589 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 590 | static inline bool __udp_is_mcast_sock(struct net *net, struct sock *sk, |
| 591 | __be16 loc_port, __be32 loc_addr, |
| 592 | __be16 rmt_port, __be32 rmt_addr, |
| 593 | int dif, unsigned short hnum) |
| 594 | { |
| 595 | struct inet_sock *inet = inet_sk(sk); |
| 596 | |
| 597 | if (!net_eq(sock_net(sk), net) || |
| 598 | udp_sk(sk)->udp_port_hash != hnum || |
| 599 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || |
| 600 | (inet->inet_dport != rmt_port && inet->inet_dport) || |
| 601 | (inet->inet_rcv_saddr && inet->inet_rcv_saddr != loc_addr) || |
| 602 | ipv6_only_sock(sk) || |
| 603 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) |
| 604 | return false; |
| 605 | if (!ip_mc_sf_allow(sk, loc_addr, rmt_addr, dif)) |
| 606 | return false; |
| 607 | return true; |
| 608 | } |
| 609 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 610 | /* |
| 611 | * This routine is called by the ICMP module when it gets some |
| 612 | * sort of error condition. If err < 0 then the socket should |
| 613 | * be closed and the error returned to the user. If err > 0 |
| 614 | * it's just the icmp type << 8 | icmp code. |
| 615 | * Header points to the ip header of the error packet. We move |
| 616 | * on past this. Then (as it used to claim before adjustment) |
| 617 | * header points to the first 8 bytes of the udp header. We need |
| 618 | * to find the appropriate port. |
| 619 | */ |
| 620 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 621 | 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] | 622 | { |
| 623 | struct inet_sock *inet; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 624 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 625 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 626 | const int type = icmp_hdr(skb)->type; |
| 627 | const int code = icmp_hdr(skb)->code; |
| 628 | struct sock *sk; |
| 629 | int harderr; |
| 630 | int err; |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 631 | struct net *net = dev_net(skb->dev); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 632 | |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 633 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 634 | iph->saddr, uh->source, skb->dev->ifindex, udptable); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 635 | if (!sk) { |
Pavel Emelyanov | dcfc23c | 2008-07-14 23:03:00 -0700 | [diff] [blame] | 636 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 637 | return; /* No socket for error */ |
| 638 | } |
| 639 | |
| 640 | err = 0; |
| 641 | harderr = 0; |
| 642 | inet = inet_sk(sk); |
| 643 | |
| 644 | switch (type) { |
| 645 | default: |
| 646 | case ICMP_TIME_EXCEEDED: |
| 647 | err = EHOSTUNREACH; |
| 648 | break; |
| 649 | case ICMP_SOURCE_QUENCH: |
| 650 | goto out; |
| 651 | case ICMP_PARAMETERPROB: |
| 652 | err = EPROTO; |
| 653 | harderr = 1; |
| 654 | break; |
| 655 | case ICMP_DEST_UNREACH: |
| 656 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 657 | ipv4_sk_update_pmtu(skb, sk, info); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 658 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { |
| 659 | err = EMSGSIZE; |
| 660 | harderr = 1; |
| 661 | break; |
| 662 | } |
| 663 | goto out; |
| 664 | } |
| 665 | err = EHOSTUNREACH; |
| 666 | if (code <= NR_ICMP_UNREACH) { |
| 667 | harderr = icmp_err_convert[code].fatal; |
| 668 | err = icmp_err_convert[code].errno; |
| 669 | } |
| 670 | break; |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 671 | case ICMP_REDIRECT: |
| 672 | ipv4_sk_redirect(skb, sk); |
Duan Jiong | 1a462d1 | 2013-09-20 18:20:28 +0800 | [diff] [blame] | 673 | goto out; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 674 | } |
| 675 | |
| 676 | /* |
| 677 | * RFC1122: OK. Passes ICMP errors back to application, as per |
| 678 | * 4.1.3.3. |
| 679 | */ |
| 680 | if (!inet->recverr) { |
| 681 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
| 682 | goto out; |
Eric Dumazet | b1faf56 | 2010-05-31 23:44:05 -0700 | [diff] [blame] | 683 | } else |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 684 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
Eric Dumazet | b1faf56 | 2010-05-31 23:44:05 -0700 | [diff] [blame] | 685 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 686 | sk->sk_err = err; |
| 687 | sk->sk_error_report(sk); |
| 688 | out: |
| 689 | sock_put(sk); |
| 690 | } |
| 691 | |
| 692 | void udp_err(struct sk_buff *skb, u32 info) |
| 693 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 694 | __udp4_lib_err(skb, info, &udp_table); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 695 | } |
| 696 | |
| 697 | /* |
| 698 | * Throw away all pending data and cancel the corking. Socket is locked. |
| 699 | */ |
Denis V. Lunev | 36d926b | 2008-06-04 15:49:07 +0400 | [diff] [blame] | 700 | void udp_flush_pending_frames(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 701 | { |
| 702 | struct udp_sock *up = udp_sk(sk); |
| 703 | |
| 704 | if (up->pending) { |
| 705 | up->len = 0; |
| 706 | up->pending = 0; |
| 707 | ip_flush_pending_frames(sk); |
| 708 | } |
| 709 | } |
Denis V. Lunev | 36d926b | 2008-06-04 15:49:07 +0400 | [diff] [blame] | 710 | EXPORT_SYMBOL(udp_flush_pending_frames); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 711 | |
| 712 | /** |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 713 | * udp4_hwcsum - handle outgoing HW checksumming |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 714 | * @skb: sk_buff containing the filled-in UDP header |
| 715 | * (checksum field must be zeroed out) |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 716 | * @src: source IP address |
| 717 | * @dst: destination IP address |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 718 | */ |
Thomas Graf | c26bf4a | 2013-07-25 18:12:18 +0200 | [diff] [blame] | 719 | void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 720 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 721 | struct udphdr *uh = udp_hdr(skb); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 722 | int offset = skb_transport_offset(skb); |
| 723 | int len = skb->len - offset; |
| 724 | int hlen = len; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 725 | __wsum csum = 0; |
| 726 | |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 727 | if (!skb_has_frag_list(skb)) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 728 | /* |
| 729 | * Only one fragment on the socket. |
| 730 | */ |
| 731 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 732 | skb->csum_offset = offsetof(struct udphdr, check); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 733 | uh->check = ~csum_tcpudp_magic(src, dst, len, |
| 734 | IPPROTO_UDP, 0); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 735 | } else { |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 736 | struct sk_buff *frags; |
| 737 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 738 | /* |
| 739 | * HW-checksum won't work as there are two or more |
| 740 | * fragments on the socket so that all csums of sk_buffs |
| 741 | * should be together |
| 742 | */ |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 743 | skb_walk_frags(skb, frags) { |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 744 | csum = csum_add(csum, frags->csum); |
| 745 | hlen -= frags->len; |
WANG Cong | ebbe495 | 2014-06-02 16:12:02 -0700 | [diff] [blame] | 746 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 747 | |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 748 | csum = skb_checksum(skb, offset, hlen, csum); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 749 | skb->ip_summed = CHECKSUM_NONE; |
| 750 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 751 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); |
| 752 | if (uh->check == 0) |
| 753 | uh->check = CSUM_MANGLED_0; |
| 754 | } |
| 755 | } |
Thomas Graf | c26bf4a | 2013-07-25 18:12:18 +0200 | [diff] [blame] | 756 | EXPORT_SYMBOL_GPL(udp4_hwcsum); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 757 | |
Tom Herbert | af5fcba | 2014-06-04 17:19:48 -0700 | [diff] [blame] | 758 | /* Function to set UDP checksum for an IPv4 UDP packet. This is intended |
| 759 | * for the simple case like when setting the checksum for a UDP tunnel. |
| 760 | */ |
| 761 | void udp_set_csum(bool nocheck, struct sk_buff *skb, |
| 762 | __be32 saddr, __be32 daddr, int len) |
| 763 | { |
| 764 | struct udphdr *uh = udp_hdr(skb); |
| 765 | |
| 766 | if (nocheck) |
| 767 | uh->check = 0; |
| 768 | else if (skb_is_gso(skb)) |
| 769 | uh->check = ~udp_v4_check(len, saddr, daddr, 0); |
| 770 | else if (skb_dst(skb) && skb_dst(skb)->dev && |
| 771 | (skb_dst(skb)->dev->features & NETIF_F_V4_CSUM)) { |
| 772 | |
| 773 | BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL); |
| 774 | |
| 775 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 776 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 777 | skb->csum_offset = offsetof(struct udphdr, check); |
| 778 | uh->check = ~udp_v4_check(len, saddr, daddr, 0); |
| 779 | } else { |
| 780 | __wsum csum; |
| 781 | |
| 782 | BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL); |
| 783 | |
| 784 | uh->check = 0; |
| 785 | csum = skb_checksum(skb, 0, len, 0); |
| 786 | uh->check = udp_v4_check(len, saddr, daddr, csum); |
| 787 | if (uh->check == 0) |
| 788 | uh->check = CSUM_MANGLED_0; |
| 789 | |
| 790 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 791 | } |
| 792 | } |
| 793 | EXPORT_SYMBOL(udp_set_csum); |
| 794 | |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 795 | static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4) |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 796 | { |
| 797 | struct sock *sk = skb->sk; |
| 798 | struct inet_sock *inet = inet_sk(sk); |
| 799 | struct udphdr *uh; |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 800 | int err = 0; |
| 801 | int is_udplite = IS_UDPLITE(sk); |
| 802 | int offset = skb_transport_offset(skb); |
| 803 | int len = skb->len - offset; |
| 804 | __wsum csum = 0; |
| 805 | |
| 806 | /* |
| 807 | * Create a UDP header |
| 808 | */ |
| 809 | uh = udp_hdr(skb); |
| 810 | uh->source = inet->inet_sport; |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 811 | uh->dest = fl4->fl4_dport; |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 812 | uh->len = htons(len); |
| 813 | uh->check = 0; |
| 814 | |
| 815 | if (is_udplite) /* UDP-Lite */ |
| 816 | csum = udplite_csum(skb); |
| 817 | |
Tom Herbert | 28448b8 | 2014-05-23 08:47:19 -0700 | [diff] [blame] | 818 | else if (sk->sk_no_check_tx) { /* UDP csum disabled */ |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 819 | |
| 820 | skb->ip_summed = CHECKSUM_NONE; |
| 821 | goto send; |
| 822 | |
| 823 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
| 824 | |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 825 | udp4_hwcsum(skb, fl4->saddr, fl4->daddr); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 826 | goto send; |
| 827 | |
| 828 | } else |
| 829 | csum = udp_csum(skb); |
| 830 | |
| 831 | /* add protocol-dependent pseudo-header */ |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 832 | uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len, |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 833 | sk->sk_protocol, csum); |
| 834 | if (uh->check == 0) |
| 835 | uh->check = CSUM_MANGLED_0; |
| 836 | |
| 837 | send: |
Eric Dumazet | b5ec8ee | 2012-08-10 02:22:47 +0000 | [diff] [blame] | 838 | err = ip_send_skb(sock_net(sk), skb); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 839 | if (err) { |
| 840 | if (err == -ENOBUFS && !inet->recverr) { |
| 841 | UDP_INC_STATS_USER(sock_net(sk), |
| 842 | UDP_MIB_SNDBUFERRORS, is_udplite); |
| 843 | err = 0; |
| 844 | } |
| 845 | } else |
| 846 | UDP_INC_STATS_USER(sock_net(sk), |
| 847 | UDP_MIB_OUTDATAGRAMS, is_udplite); |
| 848 | return err; |
| 849 | } |
| 850 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 851 | /* |
| 852 | * Push out all pending data as one UDP datagram. Socket is locked. |
| 853 | */ |
Hannes Frederic Sowa | 8822b64 | 2013-07-01 20:21:30 +0200 | [diff] [blame] | 854 | int udp_push_pending_frames(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 855 | { |
| 856 | struct udp_sock *up = udp_sk(sk); |
| 857 | struct inet_sock *inet = inet_sk(sk); |
David S. Miller | b6f21b2 | 2011-03-12 02:09:18 -0500 | [diff] [blame] | 858 | struct flowi4 *fl4 = &inet->cork.fl.u.ip4; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 859 | struct sk_buff *skb; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 860 | int err = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 861 | |
David S. Miller | 77968b7 | 2011-05-08 17:12:19 -0700 | [diff] [blame] | 862 | skb = ip_finish_skb(sk, fl4); |
Herbert Xu | f6b9664 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 863 | if (!skb) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 864 | goto out; |
| 865 | |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 866 | err = udp_send_skb(skb, fl4); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 867 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 868 | out: |
| 869 | up->len = 0; |
| 870 | up->pending = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 871 | return err; |
| 872 | } |
Hannes Frederic Sowa | 8822b64 | 2013-07-01 20:21:30 +0200 | [diff] [blame] | 873 | EXPORT_SYMBOL(udp_push_pending_frames); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 874 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 875 | 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] | 876 | { |
| 877 | struct inet_sock *inet = inet_sk(sk); |
| 878 | struct udp_sock *up = udp_sk(sk); |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 879 | struct flowi4 fl4_stack; |
David S. Miller | b6f21b2 | 2011-03-12 02:09:18 -0500 | [diff] [blame] | 880 | struct flowi4 *fl4; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 881 | int ulen = len; |
| 882 | struct ipcm_cookie ipc; |
| 883 | struct rtable *rt = NULL; |
| 884 | int free = 0; |
| 885 | int connected = 0; |
| 886 | __be32 daddr, faddr, saddr; |
| 887 | __be16 dport; |
| 888 | u8 tos; |
| 889 | int err, is_udplite = IS_UDPLITE(sk); |
| 890 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
| 891 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 892 | struct sk_buff *skb; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 893 | struct ip_options_data opt_copy; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 894 | |
| 895 | if (len > 0xFFFF) |
| 896 | return -EMSGSIZE; |
| 897 | |
| 898 | /* |
| 899 | * Check the flags. |
| 900 | */ |
| 901 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 902 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 903 | return -EOPNOTSUPP; |
| 904 | |
| 905 | ipc.opt = NULL; |
Oliver Hartkopp | 2244d07 | 2010-08-17 08:59:14 +0000 | [diff] [blame] | 906 | ipc.tx_flags = 0; |
Francesco Fusco | aa66158 | 2013-09-24 15:43:09 +0200 | [diff] [blame] | 907 | ipc.ttl = 0; |
| 908 | ipc.tos = -1; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 909 | |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 910 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
| 911 | |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 912 | fl4 = &inet->cork.fl.u.ip4; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 913 | if (up->pending) { |
| 914 | /* |
| 915 | * There are pending frames. |
| 916 | * The socket lock must be held while it's corked. |
| 917 | */ |
| 918 | lock_sock(sk); |
| 919 | if (likely(up->pending)) { |
| 920 | if (unlikely(up->pending != AF_INET)) { |
| 921 | release_sock(sk); |
| 922 | return -EINVAL; |
| 923 | } |
| 924 | goto do_append_data; |
| 925 | } |
| 926 | release_sock(sk); |
| 927 | } |
| 928 | ulen += sizeof(struct udphdr); |
| 929 | |
| 930 | /* |
| 931 | * Get and verify the address. |
| 932 | */ |
| 933 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 934 | DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 935 | if (msg->msg_namelen < sizeof(*usin)) |
| 936 | return -EINVAL; |
| 937 | if (usin->sin_family != AF_INET) { |
| 938 | if (usin->sin_family != AF_UNSPEC) |
| 939 | return -EAFNOSUPPORT; |
| 940 | } |
| 941 | |
| 942 | daddr = usin->sin_addr.s_addr; |
| 943 | dport = usin->sin_port; |
| 944 | if (dport == 0) |
| 945 | return -EINVAL; |
| 946 | } else { |
| 947 | if (sk->sk_state != TCP_ESTABLISHED) |
| 948 | return -EDESTADDRREQ; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 949 | daddr = inet->inet_daddr; |
| 950 | dport = inet->inet_dport; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 951 | /* Open fast path for connected socket. |
| 952 | Route will not be used, if at least one option is set. |
| 953 | */ |
| 954 | connected = 1; |
| 955 | } |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 956 | ipc.addr = inet->inet_saddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 957 | |
| 958 | ipc.oif = sk->sk_bound_dev_if; |
Daniel Borkmann | bf84a01 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 959 | |
| 960 | sock_tx_timestamp(sk, &ipc.tx_flags); |
| 961 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 962 | if (msg->msg_controllen) { |
Hannes Frederic Sowa | c8e6ad0 | 2014-02-18 21:38:08 +0100 | [diff] [blame] | 963 | err = ip_cmsg_send(sock_net(sk), msg, &ipc, |
| 964 | sk->sk_family == AF_INET6); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 965 | if (err) |
| 966 | return err; |
| 967 | if (ipc.opt) |
| 968 | free = 1; |
| 969 | connected = 0; |
| 970 | } |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 971 | if (!ipc.opt) { |
| 972 | struct ip_options_rcu *inet_opt; |
| 973 | |
| 974 | rcu_read_lock(); |
| 975 | inet_opt = rcu_dereference(inet->inet_opt); |
| 976 | if (inet_opt) { |
| 977 | memcpy(&opt_copy, inet_opt, |
| 978 | sizeof(*inet_opt) + inet_opt->opt.optlen); |
| 979 | ipc.opt = &opt_copy.opt; |
| 980 | } |
| 981 | rcu_read_unlock(); |
| 982 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 983 | |
| 984 | saddr = ipc.addr; |
| 985 | ipc.addr = faddr = daddr; |
| 986 | |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 987 | if (ipc.opt && ipc.opt->opt.srr) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 988 | if (!daddr) |
| 989 | return -EINVAL; |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 990 | faddr = ipc.opt->opt.faddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 991 | connected = 0; |
| 992 | } |
Francesco Fusco | aa66158 | 2013-09-24 15:43:09 +0200 | [diff] [blame] | 993 | tos = get_rttos(&ipc, inet); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 994 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
| 995 | (msg->msg_flags & MSG_DONTROUTE) || |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 996 | (ipc.opt && ipc.opt->opt.is_strictroute)) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 997 | tos |= RTO_ONLINK; |
| 998 | connected = 0; |
| 999 | } |
| 1000 | |
| 1001 | if (ipv4_is_multicast(daddr)) { |
| 1002 | if (!ipc.oif) |
| 1003 | ipc.oif = inet->mc_index; |
| 1004 | if (!saddr) |
| 1005 | saddr = inet->mc_addr; |
| 1006 | connected = 0; |
Erich E. Hoover | 76e2105 | 2012-02-08 09:11:07 +0000 | [diff] [blame] | 1007 | } else if (!ipc.oif) |
| 1008 | ipc.oif = inet->uc_index; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1009 | |
| 1010 | if (connected) |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1011 | rt = (struct rtable *)sk_dst_check(sk, 0); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1012 | |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1013 | if (!rt) { |
Pavel Emelyanov | 84a3aa0 | 2008-07-16 20:19:08 -0700 | [diff] [blame] | 1014 | struct net *net = sock_net(sk); |
| 1015 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1016 | fl4 = &fl4_stack; |
| 1017 | flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos, |
David S. Miller | c0951cb | 2011-03-31 04:54:27 -0700 | [diff] [blame] | 1018 | RT_SCOPE_UNIVERSE, sk->sk_protocol, |
Steffen Klassert | 0e0d44a | 2013-08-28 08:04:14 +0200 | [diff] [blame] | 1019 | inet_sk_flowi_flags(sk), |
David S. Miller | c0951cb | 2011-03-31 04:54:27 -0700 | [diff] [blame] | 1020 | faddr, saddr, dport, inet->inet_sport); |
| 1021 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1022 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
| 1023 | rt = ip_route_output_flow(net, fl4, sk); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 1024 | if (IS_ERR(rt)) { |
| 1025 | err = PTR_ERR(rt); |
David S. Miller | 06dc94b | 2011-03-03 10:38:01 -0800 | [diff] [blame] | 1026 | rt = NULL; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1027 | if (err == -ENETUNREACH) |
Eric Dumazet | f1d8cba | 2013-11-28 09:51:22 -0800 | [diff] [blame] | 1028 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1029 | goto out; |
| 1030 | } |
| 1031 | |
| 1032 | err = -EACCES; |
| 1033 | if ((rt->rt_flags & RTCF_BROADCAST) && |
| 1034 | !sock_flag(sk, SOCK_BROADCAST)) |
| 1035 | goto out; |
| 1036 | if (connected) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1037 | sk_dst_set(sk, dst_clone(&rt->dst)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1038 | } |
| 1039 | |
| 1040 | if (msg->msg_flags&MSG_CONFIRM) |
| 1041 | goto do_confirm; |
| 1042 | back_from_confirm: |
| 1043 | |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1044 | saddr = fl4->saddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1045 | if (!ipc.addr) |
David S. Miller | e474995 | 2011-05-08 16:38:45 -0700 | [diff] [blame] | 1046 | daddr = ipc.addr = fl4->daddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1047 | |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 1048 | /* Lockless fast path for the non-corking case. */ |
| 1049 | if (!corkreq) { |
Al Viro | f69e6d1 | 2014-11-24 13:23:40 -0500 | [diff] [blame] | 1050 | skb = ip_make_skb(sk, fl4, getfrag, msg, ulen, |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 1051 | sizeof(struct udphdr), &ipc, &rt, |
| 1052 | msg->msg_flags); |
| 1053 | err = PTR_ERR(skb); |
YOSHIFUJI Hideaki / 吉藤英明 | 50c3a48 | 2013-01-22 06:32:49 +0000 | [diff] [blame] | 1054 | if (!IS_ERR_OR_NULL(skb)) |
David S. Miller | 79ab053 | 2011-05-09 13:31:04 -0700 | [diff] [blame] | 1055 | err = udp_send_skb(skb, fl4); |
Herbert Xu | 903ab86 | 2011-03-01 02:36:48 +0000 | [diff] [blame] | 1056 | goto out; |
| 1057 | } |
| 1058 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1059 | lock_sock(sk); |
| 1060 | if (unlikely(up->pending)) { |
| 1061 | /* The socket is already corked while preparing it. */ |
| 1062 | /* ... which is an evident application bug. --ANK */ |
| 1063 | release_sock(sk); |
| 1064 | |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1065 | net_dbg_ratelimited("cork app bug 2\n"); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1066 | err = -EINVAL; |
| 1067 | goto out; |
| 1068 | } |
| 1069 | /* |
| 1070 | * Now cork the socket to pend data. |
| 1071 | */ |
David S. Miller | b6f21b2 | 2011-03-12 02:09:18 -0500 | [diff] [blame] | 1072 | fl4 = &inet->cork.fl.u.ip4; |
| 1073 | fl4->daddr = daddr; |
| 1074 | fl4->saddr = saddr; |
David S. Miller | 9cce96d | 2011-03-12 03:00:33 -0500 | [diff] [blame] | 1075 | fl4->fl4_dport = dport; |
| 1076 | fl4->fl4_sport = inet->inet_sport; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1077 | up->pending = AF_INET; |
| 1078 | |
| 1079 | do_append_data: |
| 1080 | up->len += ulen; |
Al Viro | f69e6d1 | 2014-11-24 13:23:40 -0500 | [diff] [blame] | 1081 | err = ip_append_data(sk, fl4, getfrag, msg, ulen, |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 1082 | sizeof(struct udphdr), &ipc, &rt, |
| 1083 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1084 | if (err) |
| 1085 | udp_flush_pending_frames(sk); |
| 1086 | else if (!corkreq) |
| 1087 | err = udp_push_pending_frames(sk); |
| 1088 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
| 1089 | up->pending = 0; |
| 1090 | release_sock(sk); |
| 1091 | |
| 1092 | out: |
| 1093 | ip_rt_put(rt); |
| 1094 | if (free) |
| 1095 | kfree(ipc.opt); |
| 1096 | if (!err) |
| 1097 | return len; |
| 1098 | /* |
| 1099 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting |
| 1100 | * ENOBUFS might not be good (it's not tunable per se), but otherwise |
| 1101 | * we don't have a good statistic (IpOutDiscards but it can be too many |
| 1102 | * things). We could add another new stat but at least for now that |
| 1103 | * seems like overkill. |
| 1104 | */ |
| 1105 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { |
Pavel Emelyanov | 629ca23 | 2008-07-05 21:18:07 -0700 | [diff] [blame] | 1106 | UDP_INC_STATS_USER(sock_net(sk), |
| 1107 | UDP_MIB_SNDBUFERRORS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1108 | } |
| 1109 | return err; |
| 1110 | |
| 1111 | do_confirm: |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1112 | dst_confirm(&rt->dst); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1113 | if (!(msg->msg_flags&MSG_PROBE) || len) |
| 1114 | goto back_from_confirm; |
| 1115 | err = 0; |
| 1116 | goto out; |
| 1117 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1118 | EXPORT_SYMBOL(udp_sendmsg); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1119 | |
| 1120 | int udp_sendpage(struct sock *sk, struct page *page, int offset, |
| 1121 | size_t size, int flags) |
| 1122 | { |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 1123 | struct inet_sock *inet = inet_sk(sk); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1124 | struct udp_sock *up = udp_sk(sk); |
| 1125 | int ret; |
| 1126 | |
Shawn Landden | d3f7d56 | 2013-11-24 22:36:28 -0800 | [diff] [blame] | 1127 | if (flags & MSG_SENDPAGE_NOTLAST) |
| 1128 | flags |= MSG_MORE; |
| 1129 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1130 | if (!up->pending) { |
| 1131 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; |
| 1132 | |
| 1133 | /* Call udp_sendmsg to specify destination address which |
| 1134 | * sendpage interface can't pass. |
| 1135 | * This will succeed only when the socket is connected. |
| 1136 | */ |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1137 | ret = udp_sendmsg(sk, &msg, 0); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1138 | if (ret < 0) |
| 1139 | return ret; |
| 1140 | } |
| 1141 | |
| 1142 | lock_sock(sk); |
| 1143 | |
| 1144 | if (unlikely(!up->pending)) { |
| 1145 | release_sock(sk); |
| 1146 | |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1147 | net_dbg_ratelimited("udp cork app bug 3\n"); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1148 | return -EINVAL; |
| 1149 | } |
| 1150 | |
David S. Miller | f5fca60 | 2011-05-08 17:24:10 -0700 | [diff] [blame] | 1151 | ret = ip_append_page(sk, &inet->cork.fl.u.ip4, |
| 1152 | page, offset, size, flags); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1153 | if (ret == -EOPNOTSUPP) { |
| 1154 | release_sock(sk); |
| 1155 | return sock_no_sendpage(sk->sk_socket, page, offset, |
| 1156 | size, flags); |
| 1157 | } |
| 1158 | if (ret < 0) { |
| 1159 | udp_flush_pending_frames(sk); |
| 1160 | goto out; |
| 1161 | } |
| 1162 | |
| 1163 | up->len += size; |
| 1164 | if (!(up->corkflag || (flags&MSG_MORE))) |
| 1165 | ret = udp_push_pending_frames(sk); |
| 1166 | if (!ret) |
| 1167 | ret = size; |
| 1168 | out: |
| 1169 | release_sock(sk); |
| 1170 | return ret; |
| 1171 | } |
| 1172 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1173 | /** |
| 1174 | * first_packet_length - return length of first packet in receive queue |
| 1175 | * @sk: socket |
| 1176 | * |
| 1177 | * Drops all bad checksum frames, until a valid one is found. |
| 1178 | * Returns the length of found skb, or 0 if none is found. |
| 1179 | */ |
| 1180 | static unsigned int first_packet_length(struct sock *sk) |
| 1181 | { |
| 1182 | struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue; |
| 1183 | struct sk_buff *skb; |
| 1184 | unsigned int res; |
| 1185 | |
| 1186 | __skb_queue_head_init(&list_kill); |
| 1187 | |
| 1188 | spin_lock_bh(&rcvq->lock); |
| 1189 | while ((skb = skb_peek(rcvq)) != NULL && |
| 1190 | udp_lib_checksum_complete(skb)) { |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1191 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, |
| 1192 | IS_UDPLITE(sk)); |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1193 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, |
| 1194 | IS_UDPLITE(sk)); |
Eric Dumazet | 8edf19c | 2009-10-15 00:12:40 +0000 | [diff] [blame] | 1195 | atomic_inc(&sk->sk_drops); |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1196 | __skb_unlink(skb, rcvq); |
| 1197 | __skb_queue_tail(&list_kill, skb); |
| 1198 | } |
| 1199 | res = skb ? skb->len : 0; |
| 1200 | spin_unlock_bh(&rcvq->lock); |
| 1201 | |
| 1202 | if (!skb_queue_empty(&list_kill)) { |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1203 | bool slow = lock_sock_fast(sk); |
| 1204 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1205 | __skb_queue_purge(&list_kill); |
| 1206 | sk_mem_reclaim_partial(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1207 | unlock_sock_fast(sk, slow); |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1208 | } |
| 1209 | return res; |
| 1210 | } |
| 1211 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | /* |
| 1213 | * IOCTL requests applicable to the UDP protocol |
| 1214 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 1217 | { |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1218 | switch (cmd) { |
| 1219 | case SIOCOUTQ: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | { |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 1221 | int amount = sk_wmem_alloc_get(sk); |
| 1222 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1223 | return put_user(amount, (int __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | } |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1225 | |
| 1226 | case SIOCINQ: |
| 1227 | { |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1228 | unsigned int amount = first_packet_length(sk); |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1229 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1230 | if (amount) |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1231 | /* |
| 1232 | * We will only return the amount |
| 1233 | * of this packet since that is all |
| 1234 | * that will be read. |
| 1235 | */ |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1236 | amount -= sizeof(struct udphdr); |
| 1237 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1238 | return put_user(amount, (int __user *)arg); |
| 1239 | } |
| 1240 | |
| 1241 | default: |
| 1242 | return -ENOIOCTLCMD; |
| 1243 | } |
| 1244 | |
| 1245 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1247 | EXPORT_SYMBOL(udp_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1249 | /* |
| 1250 | * This should be easy, if there is something there we |
| 1251 | * return it, otherwise we block. |
| 1252 | */ |
| 1253 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1254 | int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock, |
| 1255 | int flags, int *addr_len) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1256 | { |
| 1257 | struct inet_sock *inet = inet_sk(sk); |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 1258 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1259 | struct sk_buff *skb; |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1260 | unsigned int ulen, copied; |
Pavel Emelyanov | 3f518bf | 2012-02-21 07:30:58 +0000 | [diff] [blame] | 1261 | int peeked, off = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1262 | int err; |
| 1263 | int is_udplite = IS_UDPLITE(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1264 | bool slow; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1265 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1266 | if (flags & MSG_ERRQUEUE) |
Hannes Frederic Sowa | 85fbaa7 | 2013-11-23 00:46:12 +0100 | [diff] [blame] | 1267 | return ip_recv_error(sk, msg, len, addr_len); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1268 | |
| 1269 | try_again: |
| 1270 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
Pavel Emelyanov | 3f518bf | 2012-02-21 07:30:58 +0000 | [diff] [blame] | 1271 | &peeked, &off, &err); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1272 | if (!skb) |
| 1273 | goto out; |
| 1274 | |
| 1275 | ulen = skb->len - sizeof(struct udphdr); |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1276 | copied = len; |
| 1277 | if (copied > ulen) |
| 1278 | copied = ulen; |
| 1279 | else if (copied < ulen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1280 | msg->msg_flags |= MSG_TRUNC; |
| 1281 | |
| 1282 | /* |
| 1283 | * If checksum is needed at all, try to do it while copying the |
| 1284 | * data. If the data is truncated, or if we only want a partial |
| 1285 | * coverage checksum (UDP-Lite), do it before the copy. |
| 1286 | */ |
| 1287 | |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1288 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1289 | if (udp_lib_checksum_complete(skb)) |
| 1290 | goto csum_copy_err; |
| 1291 | } |
| 1292 | |
| 1293 | if (skb_csum_unnecessary(skb)) |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 1294 | err = skb_copy_datagram_msg(skb, sizeof(struct udphdr), |
| 1295 | msg, copied); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1296 | else { |
Al Viro | 227158d | 2014-04-06 18:47:38 -0400 | [diff] [blame] | 1297 | err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), |
| 1298 | msg); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1299 | |
| 1300 | if (err == -EINVAL) |
| 1301 | goto csum_copy_err; |
| 1302 | } |
| 1303 | |
Eric Dumazet | 22911fc | 2012-06-27 00:23:44 +0000 | [diff] [blame] | 1304 | if (unlikely(err)) { |
| 1305 | trace_kfree_skb(skb, udp_recvmsg); |
Eric Dumazet | 979402b | 2012-09-05 23:34:44 +0000 | [diff] [blame] | 1306 | if (!peeked) { |
| 1307 | atomic_inc(&sk->sk_drops); |
| 1308 | UDP_INC_STATS_USER(sock_net(sk), |
| 1309 | UDP_MIB_INERRORS, is_udplite); |
| 1310 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1311 | goto out_free; |
Eric Dumazet | 22911fc | 2012-06-27 00:23:44 +0000 | [diff] [blame] | 1312 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1313 | |
| 1314 | if (!peeked) |
Pavel Emelyanov | 629ca23 | 2008-07-05 21:18:07 -0700 | [diff] [blame] | 1315 | UDP_INC_STATS_USER(sock_net(sk), |
| 1316 | UDP_MIB_INDATAGRAMS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1317 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1318 | sock_recv_ts_and_drops(msg, sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1319 | |
| 1320 | /* Copy the address. */ |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1321 | if (sin) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1322 | sin->sin_family = AF_INET; |
| 1323 | sin->sin_port = udp_hdr(skb)->source; |
| 1324 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| 1325 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
Hannes Frederic Sowa | bceaa90 | 2013-11-18 04:20:45 +0100 | [diff] [blame] | 1326 | *addr_len = sizeof(*sin); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1327 | } |
| 1328 | if (inet->cmsg_flags) |
Tom Herbert | ad6f939 | 2015-01-05 13:56:17 -0800 | [diff] [blame] | 1329 | ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1330 | |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 1331 | err = copied; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1332 | if (flags & MSG_TRUNC) |
| 1333 | err = ulen; |
| 1334 | |
| 1335 | out_free: |
Eric Dumazet | 9d410c7 | 2009-10-30 05:03:53 +0000 | [diff] [blame] | 1336 | skb_free_datagram_locked(sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1337 | out: |
| 1338 | return err; |
| 1339 | |
| 1340 | csum_copy_err: |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1341 | slow = lock_sock_fast(sk); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1342 | if (!skb_kill_datagram(sk, skb, flags)) { |
| 1343 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
Pavel Emelyanov | 629ca23 | 2008-07-05 21:18:07 -0700 | [diff] [blame] | 1344 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1345 | } |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1346 | unlock_sock_fast(sk, slow); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1347 | |
| 1348 | if (noblock) |
| 1349 | return -EAGAIN; |
Xufeng Zhang | 9cfaa8d | 2011-06-21 10:43:40 +0000 | [diff] [blame] | 1350 | |
| 1351 | /* starting over for a new packet */ |
| 1352 | msg->msg_flags &= ~MSG_TRUNC; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1353 | goto try_again; |
| 1354 | } |
| 1355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | int udp_disconnect(struct sock *sk, int flags) |
| 1357 | { |
| 1358 | struct inet_sock *inet = inet_sk(sk); |
| 1359 | /* |
| 1360 | * 1003.1g - break association. |
| 1361 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | sk->sk_state = TCP_CLOSE; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1364 | inet->inet_daddr = 0; |
| 1365 | inet->inet_dport = 0; |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1366 | sock_rps_reset_rxhash(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | sk->sk_bound_dev_if = 0; |
| 1368 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 1369 | inet_reset_saddr(sk); |
| 1370 | |
| 1371 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { |
| 1372 | sk->sk_prot->unhash(sk); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1373 | inet->inet_sport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | } |
| 1375 | sk_dst_reset(sk); |
| 1376 | return 0; |
| 1377 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1378 | EXPORT_SYMBOL(udp_disconnect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1380 | void udp_lib_unhash(struct sock *sk) |
| 1381 | { |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1382 | if (sk_hashed(sk)) { |
| 1383 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 1384 | struct udp_hslot *hslot, *hslot2; |
| 1385 | |
| 1386 | hslot = udp_hashslot(udptable, sock_net(sk), |
| 1387 | udp_sk(sk)->udp_port_hash); |
| 1388 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1389 | |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1390 | spin_lock_bh(&hslot->lock); |
| 1391 | if (sk_nulls_del_node_init_rcu(sk)) { |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 1392 | hslot->count--; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1393 | inet_sk(sk)->inet_num = 0; |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1394 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 1395 | |
| 1396 | spin_lock(&hslot2->lock); |
| 1397 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
| 1398 | hslot2->count--; |
| 1399 | spin_unlock(&hslot2->lock); |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1400 | } |
| 1401 | spin_unlock_bh(&hslot->lock); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1402 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1403 | } |
| 1404 | EXPORT_SYMBOL(udp_lib_unhash); |
| 1405 | |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1406 | /* |
| 1407 | * inet_rcv_saddr was changed, we must rehash secondary hash |
| 1408 | */ |
| 1409 | void udp_lib_rehash(struct sock *sk, u16 newhash) |
| 1410 | { |
| 1411 | if (sk_hashed(sk)) { |
| 1412 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
| 1413 | struct udp_hslot *hslot, *hslot2, *nhslot2; |
| 1414 | |
| 1415 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
| 1416 | nhslot2 = udp_hashslot2(udptable, newhash); |
| 1417 | udp_sk(sk)->udp_portaddr_hash = newhash; |
| 1418 | if (hslot2 != nhslot2) { |
| 1419 | hslot = udp_hashslot(udptable, sock_net(sk), |
| 1420 | udp_sk(sk)->udp_port_hash); |
| 1421 | /* we must lock primary chain too */ |
| 1422 | spin_lock_bh(&hslot->lock); |
| 1423 | |
| 1424 | spin_lock(&hslot2->lock); |
| 1425 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
| 1426 | hslot2->count--; |
| 1427 | spin_unlock(&hslot2->lock); |
| 1428 | |
| 1429 | spin_lock(&nhslot2->lock); |
| 1430 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
| 1431 | &nhslot2->head); |
| 1432 | nhslot2->count++; |
| 1433 | spin_unlock(&nhslot2->lock); |
| 1434 | |
| 1435 | spin_unlock_bh(&hslot->lock); |
| 1436 | } |
| 1437 | } |
| 1438 | } |
| 1439 | EXPORT_SYMBOL(udp_lib_rehash); |
| 1440 | |
| 1441 | static void udp_v4_rehash(struct sock *sk) |
| 1442 | { |
| 1443 | u16 new_hash = udp4_portaddr_hash(sock_net(sk), |
| 1444 | inet_sk(sk)->inet_rcv_saddr, |
| 1445 | inet_sk(sk)->inet_num); |
| 1446 | udp_lib_rehash(sk, new_hash); |
| 1447 | } |
| 1448 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1449 | static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 1450 | { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 1451 | int rc; |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1452 | |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 1453 | if (inet_sk(sk)->inet_daddr) { |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1454 | sock_rps_save_rxhash(sk, skb); |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 1455 | sk_mark_napi_id(sk, skb); |
Eric Dumazet | 2c8c56e | 2014-11-11 05:54:28 -0800 | [diff] [blame] | 1456 | sk_incoming_cpu_update(sk); |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 1457 | } |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 1458 | |
Eric Dumazet | d826eb1 | 2011-11-09 07:24:35 +0000 | [diff] [blame] | 1459 | rc = sock_queue_rcv_skb(sk, skb); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1460 | if (rc < 0) { |
| 1461 | int is_udplite = IS_UDPLITE(sk); |
| 1462 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1463 | /* Note that an ENOMEM error is charged twice */ |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1464 | if (rc == -ENOMEM) |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1465 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
| 1466 | is_udplite); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1467 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
| 1468 | kfree_skb(skb); |
Satoru Moriya | 296f7ea | 2011-06-17 11:58:39 +0000 | [diff] [blame] | 1469 | trace_udp_fail_queue_rcv_skb(rc, sk); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1470 | return -1; |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1471 | } |
| 1472 | |
| 1473 | return 0; |
| 1474 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1475 | } |
| 1476 | |
Eric Dumazet | 447167b | 2012-04-11 23:05:28 +0000 | [diff] [blame] | 1477 | static struct static_key udp_encap_needed __read_mostly; |
| 1478 | void udp_encap_enable(void) |
| 1479 | { |
| 1480 | if (!static_key_enabled(&udp_encap_needed)) |
| 1481 | static_key_slow_inc(&udp_encap_needed); |
| 1482 | } |
| 1483 | EXPORT_SYMBOL(udp_encap_enable); |
| 1484 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1485 | /* returns: |
| 1486 | * -1: error |
| 1487 | * 0: success |
| 1488 | * >0: "udp encap" protocol resubmission |
| 1489 | * |
| 1490 | * Note that in the success and error cases, the skb is assumed to |
| 1491 | * have either been requeued or freed. |
| 1492 | */ |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1493 | 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] | 1494 | { |
| 1495 | struct udp_sock *up = udp_sk(sk); |
| 1496 | int rc; |
| 1497 | int is_udplite = IS_UDPLITE(sk); |
| 1498 | |
| 1499 | /* |
| 1500 | * Charge it to the socket, dropping if the queue is full. |
| 1501 | */ |
| 1502 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1503 | goto drop; |
| 1504 | nf_reset(skb); |
| 1505 | |
Eric Dumazet | 447167b | 2012-04-11 23:05:28 +0000 | [diff] [blame] | 1506 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
Eric Dumazet | 0ad92ad | 2011-11-01 12:56:59 +0000 | [diff] [blame] | 1507 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
| 1508 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1509 | /* |
| 1510 | * This is an encapsulation socket so pass the skb to |
| 1511 | * the socket's udp_encap_rcv() hook. Otherwise, just |
| 1512 | * fall through and pass this up the UDP socket. |
| 1513 | * up->encap_rcv() returns the following value: |
| 1514 | * =0 if skb was successfully passed to the encap |
| 1515 | * handler or was discarded by it. |
| 1516 | * >0 if skb should be passed on to UDP. |
| 1517 | * <0 if skb should be resubmitted as proto -N |
| 1518 | */ |
| 1519 | |
| 1520 | /* if we're overly short, let UDP handle it */ |
Eric Dumazet | 0ad92ad | 2011-11-01 12:56:59 +0000 | [diff] [blame] | 1521 | encap_rcv = ACCESS_ONCE(up->encap_rcv); |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1522 | if (skb->len > sizeof(struct udphdr) && encap_rcv) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1523 | int ret; |
| 1524 | |
Tom Herbert | 0a80966 | 2014-05-07 16:52:39 -0700 | [diff] [blame] | 1525 | /* Verify checksum before giving to encap */ |
| 1526 | if (udp_lib_checksum_complete(skb)) |
| 1527 | goto csum_error; |
| 1528 | |
Eric Dumazet | 0ad92ad | 2011-11-01 12:56:59 +0000 | [diff] [blame] | 1529 | ret = encap_rcv(sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1530 | if (ret <= 0) { |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1531 | UDP_INC_STATS_BH(sock_net(sk), |
| 1532 | UDP_MIB_INDATAGRAMS, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1533 | is_udplite); |
| 1534 | return -ret; |
| 1535 | } |
| 1536 | } |
| 1537 | |
| 1538 | /* FALLTHROUGH -- it's a UDP Packet */ |
| 1539 | } |
| 1540 | |
| 1541 | /* |
| 1542 | * UDP-Lite specific tests, ignored on UDP sockets |
| 1543 | */ |
| 1544 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
| 1545 | |
| 1546 | /* |
| 1547 | * MIB statistics other than incrementing the error count are |
| 1548 | * disabled for the following two types of errors: these depend |
| 1549 | * on the application settings, not on the functioning of the |
| 1550 | * protocol stack as such. |
| 1551 | * |
| 1552 | * RFC 3828 here recommends (sec 3.3): "There should also be a |
| 1553 | * way ... to ... at least let the receiving application block |
| 1554 | * delivery of packets with coverage values less than a value |
| 1555 | * provided by the application." |
| 1556 | */ |
| 1557 | if (up->pcrlen == 0) { /* full coverage was set */ |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1558 | net_dbg_ratelimited("UDPLite: partial coverage %d while full coverage %d requested\n", |
| 1559 | UDP_SKB_CB(skb)->cscov, skb->len); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1560 | goto drop; |
| 1561 | } |
| 1562 | /* The next case involves violating the min. coverage requested |
| 1563 | * by the receiver. This is subtle: if receiver wants x and x is |
| 1564 | * greater than the buffersize/MTU then receiver will complain |
| 1565 | * that it wants x while sender emits packets of smaller size y. |
| 1566 | * Therefore the above ...()->partial_cov statement is essential. |
| 1567 | */ |
| 1568 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1569 | net_dbg_ratelimited("UDPLite: coverage %d too small, need min %d\n", |
| 1570 | UDP_SKB_CB(skb)->cscov, up->pcrlen); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1571 | goto drop; |
| 1572 | } |
| 1573 | } |
| 1574 | |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 1575 | if (rcu_access_pointer(sk->sk_filter) && |
| 1576 | udp_lib_checksum_complete(skb)) |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1577 | goto csum_error; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1578 | |
Sorin Dumitru | 274f482 | 2014-07-22 21:16:51 +0300 | [diff] [blame] | 1579 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
James M Leddy | 3e215c8 | 2014-06-25 17:38:13 -0400 | [diff] [blame] | 1580 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
| 1581 | is_udplite); |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 1582 | goto drop; |
James M Leddy | 3e215c8 | 2014-06-25 17:38:13 -0400 | [diff] [blame] | 1583 | } |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 1584 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1585 | rc = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1586 | |
Shawn Bohrer | fbf8866 | 2013-10-07 11:01:40 -0500 | [diff] [blame] | 1587 | ipv4_pktinfo_prepare(sk, skb); |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1588 | bh_lock_sock(sk); |
| 1589 | if (!sock_owned_by_user(sk)) |
| 1590 | rc = __udp_queue_rcv_skb(sk, skb); |
Eric Dumazet | f545a38 | 2012-04-22 23:34:26 +0000 | [diff] [blame] | 1591 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
Zhu Yi | 5534979 | 2010-03-04 18:01:42 +0000 | [diff] [blame] | 1592 | bh_unlock_sock(sk); |
| 1593 | goto drop; |
| 1594 | } |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1595 | bh_unlock_sock(sk); |
| 1596 | |
| 1597 | return rc; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1598 | |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1599 | csum_error: |
| 1600 | 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] | 1601 | drop: |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1602 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 8edf19c | 2009-10-15 00:12:40 +0000 | [diff] [blame] | 1603 | atomic_inc(&sk->sk_drops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1604 | kfree_skb(skb); |
| 1605 | return -1; |
| 1606 | } |
| 1607 | |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1608 | static void flush_stack(struct sock **stack, unsigned int count, |
| 1609 | struct sk_buff *skb, unsigned int final) |
| 1610 | { |
| 1611 | unsigned int i; |
| 1612 | struct sk_buff *skb1 = NULL; |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 1613 | struct sock *sk; |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1614 | |
| 1615 | for (i = 0; i < count; i++) { |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 1616 | sk = stack[i]; |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1617 | if (likely(!skb1)) |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1618 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); |
| 1619 | |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 1620 | if (!skb1) { |
| 1621 | atomic_inc(&sk->sk_drops); |
| 1622 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
| 1623 | IS_UDPLITE(sk)); |
| 1624 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, |
| 1625 | IS_UDPLITE(sk)); |
| 1626 | } |
| 1627 | |
| 1628 | if (skb1 && udp_queue_rcv_skb(sk, skb1) <= 0) |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1629 | skb1 = NULL; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1630 | |
| 1631 | sock_put(sk); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1632 | } |
| 1633 | if (unlikely(skb1)) |
| 1634 | kfree_skb(skb1); |
| 1635 | } |
| 1636 | |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1637 | /* For TCP sockets, sk_rx_dst is protected by socket lock |
Eric Dumazet | e47eb5d | 2013-12-15 10:53:46 -0800 | [diff] [blame] | 1638 | * For UDP, we use xchg() to guard against concurrent changes. |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1639 | */ |
| 1640 | 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] | 1641 | { |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1642 | struct dst_entry *old; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1643 | |
Eric Dumazet | e47eb5d | 2013-12-15 10:53:46 -0800 | [diff] [blame] | 1644 | dst_hold(dst); |
| 1645 | old = xchg(&sk->sk_rx_dst, dst); |
| 1646 | dst_release(old); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1647 | } |
| 1648 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1649 | /* |
| 1650 | * Multicasts and broadcasts go to each listener. |
| 1651 | * |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1652 | * Note: called only from the BH handler context. |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1653 | */ |
Pavel Emelyanov | e316349 | 2008-06-16 17:12:11 -0700 | [diff] [blame] | 1654 | 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] | 1655 | struct udphdr *uh, |
| 1656 | __be32 saddr, __be32 daddr, |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1657 | struct udp_table *udptable, |
| 1658 | int proto) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1659 | { |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1660 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 1661 | struct hlist_nulls_node *node; |
| 1662 | unsigned short hnum = ntohs(uh->dest); |
| 1663 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); |
| 1664 | int dif = skb->dev->ifindex; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1665 | unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node); |
| 1666 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1667 | bool inner_flushed = false; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1668 | |
| 1669 | if (use_hash2) { |
| 1670 | hash2_any = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum) & |
| 1671 | udp_table.mask; |
| 1672 | hash2 = udp4_portaddr_hash(net, daddr, hnum) & udp_table.mask; |
| 1673 | start_lookup: |
| 1674 | hslot = &udp_table.hash2[hash2]; |
| 1675 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
| 1676 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1677 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1678 | spin_lock(&hslot->lock); |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1679 | sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) { |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 1680 | if (__udp_is_mcast_sock(net, sk, |
| 1681 | uh->dest, daddr, |
| 1682 | uh->source, saddr, |
| 1683 | dif, hnum)) { |
| 1684 | if (unlikely(count == ARRAY_SIZE(stack))) { |
| 1685 | flush_stack(stack, count, skb, ~0); |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1686 | inner_flushed = true; |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 1687 | count = 0; |
| 1688 | } |
| 1689 | stack[count++] = sk; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1690 | sock_hold(sk); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1691 | } |
| 1692 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1693 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1694 | spin_unlock(&hslot->lock); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1695 | |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 1696 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
| 1697 | if (use_hash2 && hash2 != hash2_any) { |
| 1698 | hash2 = hash2_any; |
| 1699 | goto start_lookup; |
| 1700 | } |
| 1701 | |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1702 | /* |
| 1703 | * do the slow work with no lock held |
| 1704 | */ |
| 1705 | if (count) { |
| 1706 | flush_stack(stack, count, skb, count - 1); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1707 | } else { |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1708 | if (!inner_flushed) |
| 1709 | UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI, |
| 1710 | proto == IPPROTO_UDPLITE); |
| 1711 | consume_skb(skb); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1712 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1713 | return 0; |
| 1714 | } |
| 1715 | |
| 1716 | /* Initialize UDP checksum. If exited with zero value (success), |
| 1717 | * CHECKSUM_UNNECESSARY means, that no more checks are required. |
| 1718 | * Otherwise, csum completion requires chacksumming packet body, |
| 1719 | * including udp header and folding it to skb->csum. |
| 1720 | */ |
| 1721 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, |
| 1722 | int proto) |
| 1723 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1724 | int err; |
| 1725 | |
| 1726 | UDP_SKB_CB(skb)->partial_cov = 0; |
| 1727 | UDP_SKB_CB(skb)->cscov = skb->len; |
| 1728 | |
| 1729 | if (proto == IPPROTO_UDPLITE) { |
| 1730 | err = udplite_checksum_init(skb, uh); |
| 1731 | if (err) |
| 1732 | return err; |
| 1733 | } |
| 1734 | |
Tom Herbert | ed70fcf | 2014-05-02 16:29:38 -0700 | [diff] [blame] | 1735 | return skb_checksum_init_zero_check(skb, proto, uh->check, |
| 1736 | inet_compute_pseudo); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1737 | } |
| 1738 | |
| 1739 | /* |
| 1740 | * All we need to do is get the socket, and then do a checksum. |
| 1741 | */ |
| 1742 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1743 | 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] | 1744 | int proto) |
| 1745 | { |
| 1746 | struct sock *sk; |
Jesper Dangaard Brouer | 7b5e56f | 2009-02-05 15:05:45 -0800 | [diff] [blame] | 1747 | struct udphdr *uh; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1748 | unsigned short ulen; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1749 | struct rtable *rt = skb_rtable(skb); |
Jesper Dangaard Brouer | 2783ef2 | 2009-02-06 01:59:12 -0800 | [diff] [blame] | 1750 | __be32 saddr, daddr; |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1751 | struct net *net = dev_net(skb->dev); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1752 | |
| 1753 | /* |
| 1754 | * Validate the packet. |
| 1755 | */ |
| 1756 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
| 1757 | goto drop; /* No space for header. */ |
| 1758 | |
Jesper Dangaard Brouer | 7b5e56f | 2009-02-05 15:05:45 -0800 | [diff] [blame] | 1759 | uh = udp_hdr(skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1760 | ulen = ntohs(uh->len); |
Bjørn Mork | ccc2d97 | 2010-05-06 03:44:34 +0000 | [diff] [blame] | 1761 | saddr = ip_hdr(skb)->saddr; |
| 1762 | daddr = ip_hdr(skb)->daddr; |
| 1763 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1764 | if (ulen > skb->len) |
| 1765 | goto short_packet; |
| 1766 | |
| 1767 | if (proto == IPPROTO_UDP) { |
| 1768 | /* UDP validates ulen. */ |
| 1769 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) |
| 1770 | goto short_packet; |
| 1771 | uh = udp_hdr(skb); |
| 1772 | } |
| 1773 | |
| 1774 | if (udp4_csum_init(skb, uh, proto)) |
| 1775 | goto csum_error; |
| 1776 | |
Eric Dumazet | 8afdd99 | 2013-12-10 18:07:23 -0800 | [diff] [blame] | 1777 | sk = skb_steal_sock(skb); |
| 1778 | if (sk) { |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1779 | struct dst_entry *dst = skb_dst(skb); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1780 | int ret; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1781 | |
Eric Dumazet | 9750223 | 2013-12-11 14:46:51 -0800 | [diff] [blame] | 1782 | if (unlikely(sk->sk_rx_dst != dst)) |
| 1783 | udp_sk_rx_dst_set(sk, dst); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1784 | |
| 1785 | ret = udp_queue_rcv_skb(sk, skb); |
Eric Dumazet | 8afdd99 | 2013-12-10 18:07:23 -0800 | [diff] [blame] | 1786 | sock_put(sk); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1787 | /* a return value > 0 means to resubmit the input, but |
| 1788 | * it wants the return to be -protocol, or 0 |
| 1789 | */ |
| 1790 | if (ret > 0) |
| 1791 | return -ret; |
| 1792 | return 0; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1793 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1794 | |
Fabian Frederick | c18450a | 2014-11-04 20:48:41 +0100 | [diff] [blame] | 1795 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) |
| 1796 | return __udp4_lib_mcast_deliver(net, skb, uh, |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 1797 | saddr, daddr, udptable, proto); |
Fabian Frederick | c18450a | 2014-11-04 20:48:41 +0100 | [diff] [blame] | 1798 | |
| 1799 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1800 | if (sk) { |
Eliezer Tamir | a5b5047 | 2013-06-10 11:40:00 +0300 | [diff] [blame] | 1801 | int ret; |
| 1802 | |
Tom Herbert | 224d019 | 2015-01-05 13:56:14 -0800 | [diff] [blame] | 1803 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 1804 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
| 1805 | inet_compute_pseudo); |
| 1806 | |
Eliezer Tamir | a5b5047 | 2013-06-10 11:40:00 +0300 | [diff] [blame] | 1807 | ret = udp_queue_rcv_skb(sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1808 | sock_put(sk); |
| 1809 | |
| 1810 | /* a return value > 0 means to resubmit the input, but |
| 1811 | * it wants the return to be -protocol, or 0 |
| 1812 | */ |
| 1813 | if (ret > 0) |
| 1814 | return -ret; |
| 1815 | return 0; |
| 1816 | } |
| 1817 | |
| 1818 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1819 | goto drop; |
| 1820 | nf_reset(skb); |
| 1821 | |
| 1822 | /* No socket. Drop packet silently, if checksum is wrong */ |
| 1823 | if (udp_lib_checksum_complete(skb)) |
| 1824 | goto csum_error; |
| 1825 | |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1826 | UDP_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1827 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
| 1828 | |
| 1829 | /* |
| 1830 | * Hmm. We got an UDP packet to a port to which we |
| 1831 | * don't wanna listen. Ignore it. |
| 1832 | */ |
| 1833 | kfree_skb(skb); |
| 1834 | return 0; |
| 1835 | |
| 1836 | short_packet: |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1837 | net_dbg_ratelimited("UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
| 1838 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
| 1839 | &saddr, ntohs(uh->source), |
| 1840 | ulen, skb->len, |
| 1841 | &daddr, ntohs(uh->dest)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1842 | goto drop; |
| 1843 | |
| 1844 | csum_error: |
| 1845 | /* |
| 1846 | * RFC1122: OK. Discards the bad packet silently (as far as |
| 1847 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). |
| 1848 | */ |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1849 | net_dbg_ratelimited("UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
| 1850 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
| 1851 | &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest), |
| 1852 | ulen); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1853 | UDP_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1854 | drop: |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1855 | UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1856 | kfree_skb(skb); |
| 1857 | return 0; |
| 1858 | } |
| 1859 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1860 | /* We can only early demux multicast if there is a single matching socket. |
| 1861 | * If more than one socket found returns NULL |
| 1862 | */ |
| 1863 | static struct sock *__udp4_lib_mcast_demux_lookup(struct net *net, |
| 1864 | __be16 loc_port, __be32 loc_addr, |
| 1865 | __be16 rmt_port, __be32 rmt_addr, |
| 1866 | int dif) |
| 1867 | { |
| 1868 | struct sock *sk, *result; |
| 1869 | struct hlist_nulls_node *node; |
| 1870 | unsigned short hnum = ntohs(loc_port); |
| 1871 | unsigned int count, slot = udp_hashfn(net, hnum, udp_table.mask); |
| 1872 | struct udp_hslot *hslot = &udp_table.hash[slot]; |
| 1873 | |
Eric Dumazet | 63c6f81 | 2014-06-12 16:13:06 -0700 | [diff] [blame] | 1874 | /* Do not bother scanning a too big list */ |
| 1875 | if (hslot->count > 10) |
| 1876 | return NULL; |
| 1877 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1878 | rcu_read_lock(); |
| 1879 | begin: |
| 1880 | count = 0; |
| 1881 | result = NULL; |
| 1882 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
| 1883 | if (__udp_is_mcast_sock(net, sk, |
| 1884 | loc_port, loc_addr, |
| 1885 | rmt_port, rmt_addr, |
| 1886 | dif, hnum)) { |
| 1887 | result = sk; |
| 1888 | ++count; |
| 1889 | } |
| 1890 | } |
| 1891 | /* |
| 1892 | * if the nulls value we got at the end of this lookup is |
| 1893 | * not the expected one, we must restart lookup. |
| 1894 | * We probably met an item that was moved to another chain. |
| 1895 | */ |
| 1896 | if (get_nulls_value(node) != slot) |
| 1897 | goto begin; |
| 1898 | |
| 1899 | if (result) { |
| 1900 | if (count != 1 || |
| 1901 | unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
| 1902 | result = NULL; |
Eric Dumazet | f69b923 | 2013-10-08 21:47:29 -0700 | [diff] [blame] | 1903 | else if (unlikely(!__udp_is_mcast_sock(net, result, |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1904 | loc_port, loc_addr, |
| 1905 | rmt_port, rmt_addr, |
| 1906 | dif, hnum))) { |
| 1907 | sock_put(result); |
| 1908 | result = NULL; |
| 1909 | } |
| 1910 | } |
| 1911 | rcu_read_unlock(); |
| 1912 | return result; |
| 1913 | } |
| 1914 | |
| 1915 | /* For unicast we should only early demux connected sockets or we can |
| 1916 | * break forwarding setups. The chains here can be long so only check |
| 1917 | * if the first socket is an exact match and if not move on. |
| 1918 | */ |
| 1919 | static struct sock *__udp4_lib_demux_lookup(struct net *net, |
| 1920 | __be16 loc_port, __be32 loc_addr, |
| 1921 | __be16 rmt_port, __be32 rmt_addr, |
| 1922 | int dif) |
| 1923 | { |
| 1924 | struct sock *sk, *result; |
| 1925 | struct hlist_nulls_node *node; |
| 1926 | unsigned short hnum = ntohs(loc_port); |
| 1927 | unsigned int hash2 = udp4_portaddr_hash(net, loc_addr, hnum); |
| 1928 | unsigned int slot2 = hash2 & udp_table.mask; |
| 1929 | struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; |
Joe Perches | c722831 | 2014-05-13 20:30:07 -0700 | [diff] [blame] | 1930 | INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr); |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1931 | const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); |
| 1932 | |
| 1933 | rcu_read_lock(); |
| 1934 | result = NULL; |
| 1935 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { |
| 1936 | if (INET_MATCH(sk, net, acookie, |
| 1937 | rmt_addr, loc_addr, ports, dif)) |
| 1938 | result = sk; |
| 1939 | /* Only check first socket in chain */ |
| 1940 | break; |
| 1941 | } |
| 1942 | |
| 1943 | if (result) { |
| 1944 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
| 1945 | result = NULL; |
| 1946 | else if (unlikely(!INET_MATCH(sk, net, acookie, |
| 1947 | rmt_addr, loc_addr, |
| 1948 | ports, dif))) { |
| 1949 | sock_put(result); |
| 1950 | result = NULL; |
| 1951 | } |
| 1952 | } |
| 1953 | rcu_read_unlock(); |
| 1954 | return result; |
| 1955 | } |
| 1956 | |
| 1957 | void udp_v4_early_demux(struct sk_buff *skb) |
| 1958 | { |
Eric Dumazet | 610438b | 2013-12-11 08:10:05 -0800 | [diff] [blame] | 1959 | struct net *net = dev_net(skb->dev); |
| 1960 | const struct iphdr *iph; |
| 1961 | const struct udphdr *uh; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1962 | struct sock *sk; |
| 1963 | struct dst_entry *dst; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1964 | int dif = skb->dev->ifindex; |
| 1965 | |
| 1966 | /* validate the packet */ |
| 1967 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct udphdr))) |
| 1968 | return; |
| 1969 | |
Eric Dumazet | 610438b | 2013-12-11 08:10:05 -0800 | [diff] [blame] | 1970 | iph = ip_hdr(skb); |
| 1971 | uh = udp_hdr(skb); |
| 1972 | |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1973 | if (skb->pkt_type == PACKET_BROADCAST || |
| 1974 | skb->pkt_type == PACKET_MULTICAST) |
| 1975 | sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr, |
| 1976 | uh->source, iph->saddr, dif); |
| 1977 | else if (skb->pkt_type == PACKET_HOST) |
| 1978 | sk = __udp4_lib_demux_lookup(net, uh->dest, iph->daddr, |
| 1979 | uh->source, iph->saddr, dif); |
| 1980 | else |
| 1981 | return; |
| 1982 | |
| 1983 | if (!sk) |
| 1984 | return; |
| 1985 | |
| 1986 | skb->sk = sk; |
Alexander Duyck | 82eabd9 | 2014-09-04 13:32:11 -0400 | [diff] [blame] | 1987 | skb->destructor = sock_efree; |
Shawn Bohrer | 421b388 | 2013-10-07 11:01:39 -0500 | [diff] [blame] | 1988 | dst = sk->sk_rx_dst; |
| 1989 | |
| 1990 | if (dst) |
| 1991 | dst = dst_check(dst, 0); |
| 1992 | if (dst) |
| 1993 | skb_dst_set_noref(skb, dst); |
| 1994 | } |
| 1995 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1996 | int udp_rcv(struct sk_buff *skb) |
| 1997 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1998 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1999 | } |
| 2000 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 2001 | void udp_destroy_sock(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2002 | { |
Tom Parkin | 44046a5 | 2013-03-19 06:11:12 +0000 | [diff] [blame] | 2003 | struct udp_sock *up = udp_sk(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 2004 | bool slow = lock_sock_fast(sk); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2005 | udp_flush_pending_frames(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 2006 | unlock_sock_fast(sk, slow); |
Tom Parkin | 44046a5 | 2013-03-19 06:11:12 +0000 | [diff] [blame] | 2007 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
| 2008 | void (*encap_destroy)(struct sock *sk); |
| 2009 | encap_destroy = ACCESS_ONCE(up->encap_destroy); |
| 2010 | if (encap_destroy) |
| 2011 | encap_destroy(sk); |
| 2012 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2013 | } |
| 2014 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | /* |
| 2016 | * Socket option code for UDP |
| 2017 | */ |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 2018 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2019 | char __user *optval, unsigned int optlen, |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 2020 | int (*push_pending_frames)(struct sock *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | { |
| 2022 | struct udp_sock *up = udp_sk(sk); |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2023 | int val, valbool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | int err = 0; |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 2025 | int is_udplite = IS_UDPLITE(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2027 | if (optlen < sizeof(int)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | return -EINVAL; |
| 2029 | |
| 2030 | if (get_user(val, (int __user *)optval)) |
| 2031 | return -EFAULT; |
| 2032 | |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2033 | valbool = val ? 1 : 0; |
| 2034 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2035 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | case UDP_CORK: |
| 2037 | if (val != 0) { |
| 2038 | up->corkflag = 1; |
| 2039 | } else { |
| 2040 | up->corkflag = 0; |
| 2041 | lock_sock(sk); |
Joe Perches | 4243cdc | 2014-11-11 21:59:20 -0800 | [diff] [blame] | 2042 | push_pending_frames(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | release_sock(sk); |
| 2044 | } |
| 2045 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2046 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | case UDP_ENCAP: |
| 2048 | switch (val) { |
| 2049 | case 0: |
| 2050 | case UDP_ENCAP_ESPINUDP: |
| 2051 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
James Chapman | 067b207 | 2007-07-05 17:08:05 -0700 | [diff] [blame] | 2052 | up->encap_rcv = xfrm4_udp_encap_rcv; |
| 2053 | /* FALLTHROUGH */ |
James Chapman | 342f023 | 2007-06-27 15:37:46 -0700 | [diff] [blame] | 2054 | case UDP_ENCAP_L2TPINUDP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | up->encap_type = val; |
Eric Dumazet | 447167b | 2012-04-11 23:05:28 +0000 | [diff] [blame] | 2056 | udp_encap_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | break; |
| 2058 | default: |
| 2059 | err = -ENOPROTOOPT; |
| 2060 | break; |
| 2061 | } |
| 2062 | break; |
| 2063 | |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2064 | case UDP_NO_CHECK6_TX: |
| 2065 | up->no_check6_tx = valbool; |
| 2066 | break; |
| 2067 | |
| 2068 | case UDP_NO_CHECK6_RX: |
| 2069 | up->no_check6_rx = valbool; |
| 2070 | break; |
| 2071 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2072 | /* |
| 2073 | * UDP-Lite's partial checksum coverage (RFC 3828). |
| 2074 | */ |
| 2075 | /* The sender sets actual checksum coverage length via this option. |
| 2076 | * The case coverage > packet length is handled by send module. */ |
| 2077 | case UDPLITE_SEND_CSCOV: |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 2078 | if (!is_udplite) /* Disable the option on UDP sockets */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2079 | return -ENOPROTOOPT; |
| 2080 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ |
| 2081 | val = 8; |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 2082 | else if (val > USHRT_MAX) |
| 2083 | val = USHRT_MAX; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2084 | up->pcslen = val; |
| 2085 | up->pcflag |= UDPLITE_SEND_CC; |
| 2086 | break; |
| 2087 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2088 | /* The receiver specifies a minimum checksum coverage value. To make |
| 2089 | * 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] | 2090 | * used, this again means full checksum coverage. */ |
| 2091 | case UDPLITE_RECV_CSCOV: |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 2092 | if (!is_udplite) /* Disable the option on UDP sockets */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2093 | return -ENOPROTOOPT; |
| 2094 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ |
| 2095 | val = 8; |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 2096 | else if (val > USHRT_MAX) |
| 2097 | val = USHRT_MAX; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2098 | up->pcrlen = val; |
| 2099 | up->pcflag |= UDPLITE_RECV_CC; |
| 2100 | break; |
| 2101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | default: |
| 2103 | err = -ENOPROTOOPT; |
| 2104 | break; |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2105 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | |
| 2107 | return err; |
| 2108 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2109 | EXPORT_SYMBOL(udp_lib_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2111 | int udp_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2112 | char __user *optval, unsigned int optlen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2113 | { |
| 2114 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2115 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 2116 | udp_push_pending_frames); |
| 2117 | return ip_setsockopt(sk, level, optname, optval, optlen); |
| 2118 | } |
| 2119 | |
| 2120 | #ifdef CONFIG_COMPAT |
| 2121 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2122 | char __user *optval, unsigned int optlen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2123 | { |
| 2124 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2125 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 2126 | udp_push_pending_frames); |
| 2127 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
| 2128 | } |
| 2129 | #endif |
| 2130 | |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 2131 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
| 2132 | char __user *optval, int __user *optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | { |
| 2134 | struct udp_sock *up = udp_sk(sk); |
| 2135 | int val, len; |
| 2136 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2137 | if (get_user(len, optlen)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | return -EFAULT; |
| 2139 | |
| 2140 | len = min_t(unsigned int, len, sizeof(int)); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2141 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2142 | if (len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | return -EINVAL; |
| 2144 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2145 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | case UDP_CORK: |
| 2147 | val = up->corkflag; |
| 2148 | break; |
| 2149 | |
| 2150 | case UDP_ENCAP: |
| 2151 | val = up->encap_type; |
| 2152 | break; |
| 2153 | |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 2154 | case UDP_NO_CHECK6_TX: |
| 2155 | val = up->no_check6_tx; |
| 2156 | break; |
| 2157 | |
| 2158 | case UDP_NO_CHECK6_RX: |
| 2159 | val = up->no_check6_rx; |
| 2160 | break; |
| 2161 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2162 | /* The following two cannot be changed on UDP sockets, the return is |
| 2163 | * always 0 (which corresponds to the full checksum coverage of UDP). */ |
| 2164 | case UDPLITE_SEND_CSCOV: |
| 2165 | val = up->pcslen; |
| 2166 | break; |
| 2167 | |
| 2168 | case UDPLITE_RECV_CSCOV: |
| 2169 | val = up->pcrlen; |
| 2170 | break; |
| 2171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | default: |
| 2173 | return -ENOPROTOOPT; |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2174 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2176 | if (put_user(len, optlen)) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2177 | return -EFAULT; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2178 | if (copy_to_user(optval, &val, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | return -EFAULT; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2180 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2182 | EXPORT_SYMBOL(udp_lib_getsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2184 | int udp_getsockopt(struct sock *sk, int level, int optname, |
| 2185 | char __user *optval, int __user *optlen) |
| 2186 | { |
| 2187 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2188 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| 2189 | return ip_getsockopt(sk, level, optname, optval, optlen); |
| 2190 | } |
| 2191 | |
| 2192 | #ifdef CONFIG_COMPAT |
| 2193 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, |
| 2194 | char __user *optval, int __user *optlen) |
| 2195 | { |
| 2196 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 2197 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| 2198 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
| 2199 | } |
| 2200 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | /** |
| 2202 | * udp_poll - wait for a UDP event. |
| 2203 | * @file - file struct |
| 2204 | * @sock - socket |
| 2205 | * @wait - poll table |
| 2206 | * |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2207 | * This is same as datagram poll, except for the special case of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | * blocking sockets. If application is using a blocking fd |
| 2209 | * and a packet with checksum error is in the queue; |
| 2210 | * then it could get return from select indicating data available |
| 2211 | * but then block when reading it. Add special case code |
| 2212 | * to work around these arguably broken applications. |
| 2213 | */ |
| 2214 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) |
| 2215 | { |
| 2216 | unsigned int mask = datagram_poll(file, sock, wait); |
| 2217 | struct sock *sk = sock->sk; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 2218 | |
David Majnemer | c3f1dba | 2013-05-31 13:15:38 +0000 | [diff] [blame] | 2219 | sock_rps_record_flow(sk); |
| 2220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | /* Check for false positives due to checksum errors */ |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 2222 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
| 2223 | !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk)) |
| 2224 | mask &= ~(POLLIN | POLLRDNORM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | |
| 2226 | return mask; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2229 | EXPORT_SYMBOL(udp_poll); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2231 | struct proto udp_prot = { |
| 2232 | .name = "UDP", |
| 2233 | .owner = THIS_MODULE, |
| 2234 | .close = udp_lib_close, |
| 2235 | .connect = ip4_datagram_connect, |
| 2236 | .disconnect = udp_disconnect, |
| 2237 | .ioctl = udp_ioctl, |
| 2238 | .destroy = udp_destroy_sock, |
| 2239 | .setsockopt = udp_setsockopt, |
| 2240 | .getsockopt = udp_getsockopt, |
| 2241 | .sendmsg = udp_sendmsg, |
| 2242 | .recvmsg = udp_recvmsg, |
| 2243 | .sendpage = udp_sendpage, |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 2244 | .backlog_rcv = __udp_queue_rcv_skb, |
Steffen Klassert | 8141ed9 | 2013-01-21 02:00:03 +0000 | [diff] [blame] | 2245 | .release_cb = ip4_datagram_release_cb, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2246 | .hash = udp_lib_hash, |
| 2247 | .unhash = udp_lib_unhash, |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 2248 | .rehash = udp_v4_rehash, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2249 | .get_port = udp_v4_get_port, |
| 2250 | .memory_allocated = &udp_memory_allocated, |
| 2251 | .sysctl_mem = sysctl_udp_mem, |
| 2252 | .sysctl_wmem = &sysctl_udp_wmem_min, |
| 2253 | .sysctl_rmem = &sysctl_udp_rmem_min, |
| 2254 | .obj_size = sizeof(struct udp_sock), |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 2255 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2256 | .h.udp_table = &udp_table, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2257 | #ifdef CONFIG_COMPAT |
| 2258 | .compat_setsockopt = compat_udp_setsockopt, |
| 2259 | .compat_getsockopt = compat_udp_getsockopt, |
| 2260 | #endif |
Octavian Purdila | fcbdf09 | 2010-12-16 14:26:56 -0800 | [diff] [blame] | 2261 | .clear_sk = sk_prot_clear_portaddr_nulls, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2262 | }; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2263 | EXPORT_SYMBOL(udp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | |
| 2265 | /* ------------------------------------------------------------------------ */ |
| 2266 | #ifdef CONFIG_PROC_FS |
| 2267 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2268 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | { |
| 2270 | struct sock *sk; |
| 2271 | struct udp_iter_state *state = seq->private; |
Denis V. Lunev | 6f191ef | 2008-03-28 18:23:33 -0700 | [diff] [blame] | 2272 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2274 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
| 2275 | ++state->bucket) { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 2276 | struct hlist_nulls_node *node; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2277 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2278 | |
| 2279 | if (hlist_nulls_empty(&hslot->head)) |
| 2280 | continue; |
| 2281 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2282 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 2283 | sk_nulls_for_each(sk, node, &hslot->head) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2284 | if (!net_eq(sock_net(sk), net)) |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2285 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | if (sk->sk_family == state->family) |
| 2287 | goto found; |
| 2288 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2289 | spin_unlock_bh(&hslot->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | } |
| 2291 | sk = NULL; |
| 2292 | found: |
| 2293 | return sk; |
| 2294 | } |
| 2295 | |
| 2296 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) |
| 2297 | { |
| 2298 | struct udp_iter_state *state = seq->private; |
Denis V. Lunev | 6f191ef | 2008-03-28 18:23:33 -0700 | [diff] [blame] | 2299 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | |
| 2301 | do { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 2302 | sk = sk_nulls_next(sk); |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2303 | } 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] | 2304 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2305 | if (!sk) { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2306 | if (state->bucket <= state->udp_table->mask) |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 2307 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2308 | return udp_get_first(seq, state->bucket + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2309 | } |
| 2310 | return sk; |
| 2311 | } |
| 2312 | |
| 2313 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) |
| 2314 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2315 | struct sock *sk = udp_get_first(seq, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2316 | |
| 2317 | if (sk) |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 2318 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | --pos; |
| 2320 | return pos ? NULL : sk; |
| 2321 | } |
| 2322 | |
| 2323 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) |
| 2324 | { |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 2325 | struct udp_iter_state *state = seq->private; |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2326 | state->bucket = MAX_UDP_PORTS; |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 2327 | |
YOSHIFUJI Hideaki | b50660f | 2008-03-31 19:38:15 -0700 | [diff] [blame] | 2328 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2329 | } |
| 2330 | |
| 2331 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2332 | { |
| 2333 | struct sock *sk; |
| 2334 | |
YOSHIFUJI Hideaki | b50660f | 2008-03-31 19:38:15 -0700 | [diff] [blame] | 2335 | if (v == SEQ_START_TOKEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | sk = udp_get_idx(seq, 0); |
| 2337 | else |
| 2338 | sk = udp_get_next(seq, v); |
| 2339 | |
| 2340 | ++*pos; |
| 2341 | return sk; |
| 2342 | } |
| 2343 | |
| 2344 | static void udp_seq_stop(struct seq_file *seq, void *v) |
| 2345 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2346 | struct udp_iter_state *state = seq->private; |
| 2347 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2348 | if (state->bucket <= state->udp_table->mask) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2349 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2350 | } |
| 2351 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2352 | int udp_seq_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2353 | { |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 2354 | struct udp_seq_afinfo *afinfo = PDE_DATA(inode); |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2355 | struct udp_iter_state *s; |
| 2356 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2357 | |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2358 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
| 2359 | sizeof(struct udp_iter_state)); |
| 2360 | if (err < 0) |
| 2361 | return err; |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2362 | |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2363 | s = ((struct seq_file *)file->private_data)->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2364 | s->family = afinfo->family; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2365 | s->udp_table = afinfo->udp_table; |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2366 | return err; |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2367 | } |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2368 | EXPORT_SYMBOL(udp_seq_open); |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | /* ------------------------------------------------------------------------ */ |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 2371 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2372 | { |
| 2373 | struct proc_dir_entry *p; |
| 2374 | int rc = 0; |
| 2375 | |
Denis V. Lunev | dda6192 | 2008-03-28 18:24:26 -0700 | [diff] [blame] | 2376 | afinfo->seq_ops.start = udp_seq_start; |
| 2377 | afinfo->seq_ops.next = udp_seq_next; |
| 2378 | afinfo->seq_ops.stop = udp_seq_stop; |
| 2379 | |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2380 | 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] | 2381 | afinfo->seq_fops, afinfo); |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2382 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | rc = -ENOMEM; |
| 2384 | return rc; |
| 2385 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2386 | EXPORT_SYMBOL(udp_proc_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2387 | |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 2388 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2389 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 2390 | remove_proc_entry(afinfo->name, net->proc_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2392 | EXPORT_SYMBOL(udp_proc_unregister); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2393 | |
| 2394 | /* ------------------------------------------------------------------------ */ |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2395 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2396 | int bucket) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2397 | { |
| 2398 | struct inet_sock *inet = inet_sk(sp); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2399 | __be32 dest = inet->inet_daddr; |
| 2400 | __be32 src = inet->inet_rcv_saddr; |
| 2401 | __u16 destp = ntohs(inet->inet_dport); |
| 2402 | __u16 srcp = ntohs(inet->inet_sport); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2403 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2404 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2405 | " %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] | 2406 | bucket, src, srcp, dest, destp, sp->sk_state, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 2407 | sk_wmem_alloc_get(sp), |
| 2408 | sk_rmem_alloc_get(sp), |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 2409 | 0, 0L, 0, |
| 2410 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), |
| 2411 | 0, sock_i_ino(sp), |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 2412 | atomic_read(&sp->sk_refcnt), sp, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2413 | atomic_read(&sp->sk_drops)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2414 | } |
| 2415 | |
| 2416 | int udp4_seq_show(struct seq_file *seq, void *v) |
| 2417 | { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2418 | seq_setwidth(seq, 127); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2419 | if (v == SEQ_START_TOKEN) |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2420 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2421 | "rx_queue tr tm->when retrnsmt uid timeout " |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 2422 | "inode ref pointer drops"); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2423 | else { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2424 | struct udp_iter_state *state = seq->private; |
| 2425 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2426 | udp4_format_sock(v, seq, state->bucket); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2427 | } |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 2428 | seq_pad(seq, '\n'); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2429 | return 0; |
| 2430 | } |
| 2431 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2432 | static const struct file_operations udp_afinfo_seq_fops = { |
| 2433 | .owner = THIS_MODULE, |
| 2434 | .open = udp_seq_open, |
| 2435 | .read = seq_read, |
| 2436 | .llseek = seq_lseek, |
| 2437 | .release = seq_release_net |
| 2438 | }; |
| 2439 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2440 | /* ------------------------------------------------------------------------ */ |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2441 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2442 | .name = "udp", |
| 2443 | .family = AF_INET, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2444 | .udp_table = &udp_table, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2445 | .seq_fops = &udp_afinfo_seq_fops, |
Denis V. Lunev | dda6192 | 2008-03-28 18:24:26 -0700 | [diff] [blame] | 2446 | .seq_ops = { |
| 2447 | .show = udp4_seq_show, |
| 2448 | }, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2449 | }; |
| 2450 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2451 | static int __net_init udp4_proc_init_net(struct net *net) |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2452 | { |
| 2453 | return udp_proc_register(net, &udp4_seq_afinfo); |
| 2454 | } |
| 2455 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2456 | static void __net_exit udp4_proc_exit_net(struct net *net) |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2457 | { |
| 2458 | udp_proc_unregister(net, &udp4_seq_afinfo); |
| 2459 | } |
| 2460 | |
| 2461 | static struct pernet_operations udp4_net_ops = { |
| 2462 | .init = udp4_proc_init_net, |
| 2463 | .exit = udp4_proc_exit_net, |
| 2464 | }; |
| 2465 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2466 | int __init udp4_proc_init(void) |
| 2467 | { |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2468 | return register_pernet_subsys(&udp4_net_ops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2469 | } |
| 2470 | |
| 2471 | void udp4_proc_exit(void) |
| 2472 | { |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2473 | unregister_pernet_subsys(&udp4_net_ops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2474 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | #endif /* CONFIG_PROC_FS */ |
| 2476 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2477 | static __initdata unsigned long uhash_entries; |
| 2478 | static int __init set_uhash_entries(char *str) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2479 | { |
Eldad Zack | 413c27d | 2012-05-19 14:13:18 +0000 | [diff] [blame] | 2480 | ssize_t ret; |
| 2481 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2482 | if (!str) |
| 2483 | return 0; |
Eldad Zack | 413c27d | 2012-05-19 14:13:18 +0000 | [diff] [blame] | 2484 | |
| 2485 | ret = kstrtoul(str, 0, &uhash_entries); |
| 2486 | if (ret) |
| 2487 | return 0; |
| 2488 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2489 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) |
| 2490 | uhash_entries = UDP_HTABLE_SIZE_MIN; |
| 2491 | return 1; |
| 2492 | } |
| 2493 | __setup("uhash_entries=", set_uhash_entries); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2494 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2495 | void __init udp_table_init(struct udp_table *table, const char *name) |
| 2496 | { |
| 2497 | unsigned int i; |
| 2498 | |
Tim Bird | 31fe62b | 2012-05-23 13:33:35 +0000 | [diff] [blame] | 2499 | table->hash = alloc_large_system_hash(name, |
| 2500 | 2 * sizeof(struct udp_hslot), |
| 2501 | uhash_entries, |
| 2502 | 21, /* one slot per 2 MB */ |
| 2503 | 0, |
| 2504 | &table->log, |
| 2505 | &table->mask, |
| 2506 | UDP_HTABLE_SIZE_MIN, |
| 2507 | 64 * 1024); |
| 2508 | |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2509 | table->hash2 = table->hash + (table->mask + 1); |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2510 | for (i = 0; i <= table->mask; i++) { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 2511 | INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i); |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 2512 | table->hash[i].count = 0; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2513 | spin_lock_init(&table->hash[i].lock); |
| 2514 | } |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2515 | for (i = 0; i <= table->mask; i++) { |
| 2516 | INIT_HLIST_NULLS_HEAD(&table->hash2[i].head, i); |
| 2517 | table->hash2[i].count = 0; |
| 2518 | spin_lock_init(&table->hash2[i].lock); |
| 2519 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2520 | } |
| 2521 | |
Tom Herbert | 723b8e4 | 2015-02-24 09:17:31 -0800 | [diff] [blame] | 2522 | u32 udp_flow_hashrnd(void) |
| 2523 | { |
| 2524 | static u32 hashrnd __read_mostly; |
| 2525 | |
| 2526 | net_get_random_once(&hashrnd, sizeof(hashrnd)); |
| 2527 | |
| 2528 | return hashrnd; |
| 2529 | } |
| 2530 | EXPORT_SYMBOL(udp_flow_hashrnd); |
| 2531 | |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2532 | void __init udp_init(void) |
| 2533 | { |
Eric Dumazet | f03d78d | 2011-07-07 00:27:05 -0700 | [diff] [blame] | 2534 | unsigned long limit; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2535 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2536 | udp_table_init(&udp_table, "UDP"); |
Eric Dumazet | f03d78d | 2011-07-07 00:27:05 -0700 | [diff] [blame] | 2537 | limit = nr_free_buffer_pages() / 8; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2538 | limit = max(limit, 128UL); |
| 2539 | sysctl_udp_mem[0] = limit / 4 * 3; |
| 2540 | sysctl_udp_mem[1] = limit; |
| 2541 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; |
| 2542 | |
| 2543 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; |
| 2544 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; |
| 2545 | } |