Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * UDP over IPv6 |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 3 | * Linux INET6 implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Authors: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 8 | * Based on linux/ipv4/udp.c |
| 9 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * Fixes: |
| 11 | * Hideaki YOSHIFUJI : sin6_scope_id support |
| 12 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| 13 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| 14 | * a single port at the same time. |
| 15 | * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data |
| 16 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. |
| 17 | * |
| 18 | * This program is free software; you can redistribute it and/or |
| 19 | * modify it under the terms of the GNU General Public License |
| 20 | * as published by the Free Software Foundation; either version |
| 21 | * 2 of the License, or (at your option) any later version. |
| 22 | */ |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/errno.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/socket.h> |
| 27 | #include <linux/sockios.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/net.h> |
| 29 | #include <linux/in6.h> |
| 30 | #include <linux/netdevice.h> |
| 31 | #include <linux/if_arp.h> |
| 32 | #include <linux/ipv6.h> |
| 33 | #include <linux/icmpv6.h> |
| 34 | #include <linux/init.h> |
Herbert Xu | 1781f7f | 2007-12-11 11:30:32 -0800 | [diff] [blame] | 35 | #include <linux/module.h> |
Herbert Xu | 3305b80 | 2005-12-13 23:16:37 -0800 | [diff] [blame] | 36 | #include <linux/skbuff.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 37 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <asm/uaccess.h> |
| 39 | |
Craig Gallek | 496611d | 2016-02-10 11:50:36 -0500 | [diff] [blame] | 40 | #include <net/addrconf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <net/ndisc.h> |
| 42 | #include <net/protocol.h> |
| 43 | #include <net/transp_v6.h> |
| 44 | #include <net/ip6_route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <net/raw.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 46 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <net/ip6_checksum.h> |
| 48 | #include <net/xfrm.h> |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 49 | #include <net/inet6_hashtables.h> |
Eliezer Tamir | 076bb0c | 2013-07-10 17:13:17 +0300 | [diff] [blame] | 50 | #include <net/busy_poll.h> |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 51 | #include <net/sock_reuseport.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | #include <linux/proc_fs.h> |
| 54 | #include <linux/seq_file.h> |
Eric Dumazet | 22911fc | 2012-06-27 00:23:44 +0000 | [diff] [blame] | 55 | #include <trace/events/skb.h> |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 56 | #include "udp_impl.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 58 | static u32 udp6_ehashfn(const struct net *net, |
| 59 | const struct in6_addr *laddr, |
| 60 | const u16 lport, |
| 61 | const struct in6_addr *faddr, |
| 62 | const __be16 fport) |
Hannes Frederic Sowa | b50026b | 2013-10-19 21:48:52 +0200 | [diff] [blame] | 63 | { |
Hannes Frederic Sowa | 1bbdcee | 2013-10-19 21:48:57 +0200 | [diff] [blame] | 64 | static u32 udp6_ehash_secret __read_mostly; |
| 65 | static u32 udp_ipv6_hash_secret __read_mostly; |
| 66 | |
| 67 | u32 lhash, fhash; |
| 68 | |
| 69 | net_get_random_once(&udp6_ehash_secret, |
| 70 | sizeof(udp6_ehash_secret)); |
| 71 | net_get_random_once(&udp_ipv6_hash_secret, |
| 72 | sizeof(udp_ipv6_hash_secret)); |
| 73 | |
| 74 | lhash = (__force u32)laddr->s6_addr32[3]; |
| 75 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); |
| 76 | |
Hannes Frederic Sowa | b50026b | 2013-10-19 21:48:52 +0200 | [diff] [blame] | 77 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
Hannes Frederic Sowa | 1bbdcee | 2013-10-19 21:48:57 +0200 | [diff] [blame] | 78 | udp_ipv6_hash_secret + net_hash_mix(net)); |
Hannes Frederic Sowa | b50026b | 2013-10-19 21:48:52 +0200 | [diff] [blame] | 79 | } |
| 80 | |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 81 | static u32 udp6_portaddr_hash(const struct net *net, |
| 82 | const struct in6_addr *addr6, |
| 83 | unsigned int port) |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 84 | { |
| 85 | unsigned int hash, mix = net_hash_mix(net); |
| 86 | |
| 87 | if (ipv6_addr_any(addr6)) |
| 88 | hash = jhash_1word(0, mix); |
Brian Haley | 856540e | 2009-11-09 12:05:53 +0000 | [diff] [blame] | 89 | else if (ipv6_addr_v4mapped(addr6)) |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 90 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 91 | else |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 92 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 93 | |
| 94 | return hash ^ port; |
| 95 | } |
| 96 | |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 97 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 99 | unsigned int hash2_nulladdr = |
| 100 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); |
Jeffrin Jose | 9a52e97 | 2012-05-19 01:45:21 +0000 | [diff] [blame] | 101 | unsigned int hash2_partial = |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 102 | udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 103 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 104 | /* precompute partial secondary hash */ |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 105 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
| 106 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 109 | static void udp_v6_rehash(struct sock *sk) |
| 110 | { |
| 111 | u16 new_hash = udp6_portaddr_hash(sock_net(sk), |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 112 | &sk->sk_v6_rcv_saddr, |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 113 | inet_sk(sk)->inet_num); |
| 114 | |
| 115 | udp_lib_rehash(sk, new_hash); |
| 116 | } |
| 117 | |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 118 | static int compute_score(struct sock *sk, struct net *net, |
| 119 | const struct in6_addr *saddr, __be16 sport, |
| 120 | const struct in6_addr *daddr, unsigned short hnum, |
| 121 | int dif) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 122 | { |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 123 | int score; |
| 124 | struct inet_sock *inet; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 125 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 126 | if (!net_eq(sock_net(sk), net) || |
| 127 | udp_sk(sk)->udp_port_hash != hnum || |
| 128 | sk->sk_family != PF_INET6) |
| 129 | return -1; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 130 | |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 131 | score = 0; |
| 132 | inet = inet_sk(sk); |
| 133 | |
| 134 | if (inet->inet_dport) { |
| 135 | if (inet->inet_dport != sport) |
| 136 | return -1; |
| 137 | score++; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 138 | } |
Joe Perches | 60c04ae | 2014-12-01 20:29:06 -0800 | [diff] [blame] | 139 | |
| 140 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
| 141 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) |
| 142 | return -1; |
| 143 | score++; |
| 144 | } |
| 145 | |
| 146 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
| 147 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) |
| 148 | return -1; |
| 149 | score++; |
| 150 | } |
| 151 | |
| 152 | if (sk->sk_bound_dev_if) { |
| 153 | if (sk->sk_bound_dev_if != dif) |
| 154 | return -1; |
| 155 | score++; |
| 156 | } |
| 157 | |
Eric Dumazet | 70da268 | 2015-10-08 19:33:21 -0700 | [diff] [blame] | 158 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
| 159 | score++; |
| 160 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 161 | return score; |
| 162 | } |
| 163 | |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 164 | /* called with rcu_read_lock() */ |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 165 | static struct sock *udp6_lib_lookup2(struct net *net, |
| 166 | const struct in6_addr *saddr, __be16 sport, |
| 167 | const struct in6_addr *daddr, unsigned int hnum, int dif, |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 168 | struct udp_hslot *hslot2, |
Craig Gallek | 1134158 | 2016-01-05 15:08:07 -0500 | [diff] [blame] | 169 | struct sk_buff *skb) |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 170 | { |
| 171 | struct sock *sk, *result; |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 172 | int score, badness, matches = 0, reuseport = 0; |
| 173 | u32 hash = 0; |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 174 | |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 175 | result = NULL; |
| 176 | badness = -1; |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 177 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 178 | score = compute_score(sk, net, saddr, sport, |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 179 | daddr, hnum, dif); |
| 180 | if (score > badness) { |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 181 | reuseport = sk->sk_reuseport; |
| 182 | if (reuseport) { |
Hannes Frederic Sowa | b50026b | 2013-10-19 21:48:52 +0200 | [diff] [blame] | 183 | hash = udp6_ehashfn(net, daddr, hnum, |
| 184 | saddr, sport); |
Eric Dumazet | ed0dfff | 2016-01-19 08:36:43 -0800 | [diff] [blame] | 185 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 186 | result = reuseport_select_sock(sk, hash, skb, |
Eric Dumazet | ed0dfff | 2016-01-19 08:36:43 -0800 | [diff] [blame] | 187 | sizeof(struct udphdr)); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 188 | if (result) |
| 189 | return result; |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 190 | matches = 1; |
Eric Dumazet | 70da268 | 2015-10-08 19:33:21 -0700 | [diff] [blame] | 191 | } |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 192 | result = sk; |
| 193 | badness = score; |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 194 | } else if (score == badness && reuseport) { |
| 195 | matches++; |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 196 | if (reciprocal_scale(hash, matches) == 0) |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 197 | result = sk; |
| 198 | hash = next_pseudo_random32(hash); |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 199 | } |
| 200 | } |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 201 | return result; |
| 202 | } |
| 203 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 204 | /* rcu_read_lock() must be held */ |
Pavel Emelyanov | fce8233 | 2011-12-09 06:23:34 +0000 | [diff] [blame] | 205 | struct sock *__udp6_lib_lookup(struct net *net, |
Balazs Scheidler | 88440ae | 2010-10-21 16:04:33 +0200 | [diff] [blame] | 206 | const struct in6_addr *saddr, __be16 sport, |
| 207 | const struct in6_addr *daddr, __be16 dport, |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 208 | int dif, struct udp_table *udptable, |
| 209 | struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | { |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 211 | struct sock *sk, *result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | unsigned short hnum = ntohs(dport); |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 213 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
| 214 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 215 | int score, badness, matches = 0, reuseport = 0; |
| 216 | u32 hash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 218 | if (hslot->count > 10) { |
| 219 | hash2 = udp6_portaddr_hash(net, daddr, hnum); |
| 220 | slot2 = hash2 & udptable->mask; |
| 221 | hslot2 = &udptable->hash2[slot2]; |
| 222 | if (hslot->count < hslot2->count) |
| 223 | goto begin; |
| 224 | |
| 225 | result = udp6_lib_lookup2(net, saddr, sport, |
| 226 | daddr, hnum, dif, |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 227 | hslot2, skb); |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 228 | if (!result) { |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 229 | unsigned int old_slot2 = slot2; |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 230 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); |
| 231 | slot2 = hash2 & udptable->mask; |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 232 | /* avoid searching the same slot again. */ |
| 233 | if (unlikely(slot2 == old_slot2)) |
| 234 | return result; |
| 235 | |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 236 | hslot2 = &udptable->hash2[slot2]; |
| 237 | if (hslot->count < hslot2->count) |
| 238 | goto begin; |
| 239 | |
Jorge Boncompte [DTI2] | 1223c67 | 2010-04-08 04:56:48 +0000 | [diff] [blame] | 240 | result = udp6_lib_lookup2(net, saddr, sport, |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 241 | daddr, hnum, dif, |
| 242 | hslot2, skb); |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 243 | } |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 244 | return result; |
| 245 | } |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 246 | begin: |
| 247 | result = NULL; |
| 248 | badness = -1; |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 249 | sk_for_each_rcu(sk, &hslot->head) { |
Su, Xuemin | d1e3728 | 2016-06-13 11:02:50 +0800 | [diff] [blame] | 250 | score = compute_score(sk, net, saddr, sport, daddr, hnum, dif); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 251 | if (score > badness) { |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 252 | reuseport = sk->sk_reuseport; |
| 253 | if (reuseport) { |
Hannes Frederic Sowa | b50026b | 2013-10-19 21:48:52 +0200 | [diff] [blame] | 254 | hash = udp6_ehashfn(net, daddr, hnum, |
| 255 | saddr, sport); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 256 | result = reuseport_select_sock(sk, hash, skb, |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 257 | sizeof(struct udphdr)); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 258 | if (result) |
| 259 | return result; |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 260 | matches = 1; |
| 261 | } |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 262 | result = sk; |
| 263 | badness = score; |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 264 | } else if (score == badness && reuseport) { |
| 265 | matches++; |
Daniel Borkmann | 8fc54f6 | 2014-08-23 20:58:54 +0200 | [diff] [blame] | 266 | if (reciprocal_scale(hash, matches) == 0) |
Tom Herbert | 72289b9 | 2013-01-22 09:50:44 +0000 | [diff] [blame] | 267 | result = sk; |
| 268 | hash = next_pseudo_random32(hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | } |
| 270 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | return result; |
| 272 | } |
Pavel Emelyanov | fce8233 | 2011-12-09 06:23:34 +0000 | [diff] [blame] | 273 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 275 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
| 276 | __be16 sport, __be16 dport, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 277 | struct udp_table *udptable) |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 278 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 279 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
Alexander Duyck | ed7cbbc | 2016-05-12 16:23:44 -0700 | [diff] [blame] | 280 | struct sock *sk; |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 281 | |
Ian Morris | e5d08d7 | 2014-11-23 21:28:43 +0000 | [diff] [blame] | 282 | sk = skb_steal_sock(skb); |
| 283 | if (unlikely(sk)) |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 284 | return sk; |
Alexander Duyck | ed7cbbc | 2016-05-12 16:23:44 -0700 | [diff] [blame] | 285 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 286 | &iph->daddr, dport, inet6_iif(skb), |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 287 | udptable, skb); |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Tom Herbert | 6305830 | 2016-04-05 08:22:50 -0700 | [diff] [blame] | 290 | struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, |
| 291 | __be16 sport, __be16 dport) |
| 292 | { |
| 293 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
Tom Herbert | 6305830 | 2016-04-05 08:22:50 -0700 | [diff] [blame] | 294 | |
Alexander Duyck | ed7cbbc | 2016-05-12 16:23:44 -0700 | [diff] [blame] | 295 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
Tom Herbert | 6305830 | 2016-04-05 08:22:50 -0700 | [diff] [blame] | 296 | &iph->daddr, dport, inet6_iif(skb), |
| 297 | &udp_table, skb); |
| 298 | } |
| 299 | EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); |
| 300 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 301 | /* Must be called under rcu_read_lock(). |
| 302 | * Does increment socket refcount. |
| 303 | */ |
| 304 | #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ |
| 305 | IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) |
Balazs Scheidler | aa976fc | 2010-10-21 16:05:41 +0200 | [diff] [blame] | 306 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
| 307 | const struct in6_addr *daddr, __be16 dport, int dif) |
| 308 | { |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 309 | struct sock *sk; |
| 310 | |
| 311 | sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, |
| 312 | dif, &udp_table, NULL); |
| 313 | if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) |
| 314 | sk = NULL; |
| 315 | return sk; |
Balazs Scheidler | aa976fc | 2010-10-21 16:05:41 +0200 | [diff] [blame] | 316 | } |
| 317 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 318 | #endif |
Balazs Scheidler | aa976fc | 2010-10-21 16:05:41 +0200 | [diff] [blame] | 319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | /* |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 321 | * This should be easy, if there is something there we |
| 322 | * return it, otherwise we block. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | */ |
| 324 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 325 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | int noblock, int flags, int *addr_len) |
| 327 | { |
| 328 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 329 | struct inet_sock *inet = inet_sk(sk); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 330 | struct sk_buff *skb; |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 331 | unsigned int ulen, copied; |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 332 | int peeked, peeking, off; |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 333 | int err; |
| 334 | int is_udplite = IS_UDPLITE(sk); |
Eric Dumazet | 197c949 | 2015-12-30 08:51:12 -0500 | [diff] [blame] | 335 | bool checksum_valid = false; |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 336 | int is_udp4; |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 337 | bool slow; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | if (flags & MSG_ERRQUEUE) |
Hannes Frederic Sowa | 85fbaa7 | 2013-11-23 00:46:12 +0100 | [diff] [blame] | 340 | return ipv6_recv_error(sk, msg, len, addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 342 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
Hannes Frederic Sowa | 85fbaa7 | 2013-11-23 00:46:12 +0100 | [diff] [blame] | 343 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | try_again: |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 346 | peeking = off = sk_peek_offset(sk, flags); |
Herbert Xu | a59322b | 2007-12-05 01:53:40 -0800 | [diff] [blame] | 347 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
Pavel Emelyanov | 3f518bf | 2012-02-21 07:30:58 +0000 | [diff] [blame] | 348 | &peeked, &off, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | if (!skb) |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 350 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
samanthakumar | e6afc8a | 2016-04-05 12:41:15 -0400 | [diff] [blame] | 352 | ulen = skb->len; |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 353 | copied = len; |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 354 | if (copied > ulen - off) |
| 355 | copied = ulen - off; |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 356 | else if (copied < ulen) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 357 | msg->msg_flags |= MSG_TRUNC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 359 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
| 360 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 361 | /* |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 362 | * If checksum is needed at all, try to do it while copying the |
| 363 | * data. If the data is truncated, or if we only want a partial |
| 364 | * coverage checksum (UDP-Lite), do it before the copy. |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 365 | */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 366 | |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 367 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) { |
Eric Dumazet | 197c949 | 2015-12-30 08:51:12 -0500 | [diff] [blame] | 368 | checksum_valid = !udp_lib_checksum_complete(skb); |
| 369 | if (!checksum_valid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | goto csum_copy_err; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 371 | } |
| 372 | |
Eric Dumazet | 197c949 | 2015-12-30 08:51:12 -0500 | [diff] [blame] | 373 | if (checksum_valid || skb_csum_unnecessary(skb)) |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 374 | err = skb_copy_datagram_msg(skb, off, msg, copied); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 375 | else { |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 376 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | if (err == -EINVAL) |
| 378 | goto csum_copy_err; |
| 379 | } |
Eric Dumazet | 22911fc | 2012-06-27 00:23:44 +0000 | [diff] [blame] | 380 | if (unlikely(err)) { |
| 381 | trace_kfree_skb(skb, udpv6_recvmsg); |
Eric Dumazet | 979402b | 2012-09-05 23:34:44 +0000 | [diff] [blame] | 382 | if (!peeked) { |
| 383 | atomic_inc(&sk->sk_drops); |
| 384 | if (is_udp4) |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 385 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
| 386 | is_udplite); |
Eric Dumazet | 979402b | 2012-09-05 23:34:44 +0000 | [diff] [blame] | 387 | else |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 388 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
| 389 | is_udplite); |
Eric Dumazet | 979402b | 2012-09-05 23:34:44 +0000 | [diff] [blame] | 390 | } |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 391 | skb_free_datagram_locked(sk, skb); |
| 392 | return err; |
Eric Dumazet | 22911fc | 2012-06-27 00:23:44 +0000 | [diff] [blame] | 393 | } |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 394 | if (!peeked) { |
| 395 | if (is_udp4) |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 396 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
| 397 | is_udplite); |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 398 | else |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 399 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
| 400 | is_udplite); |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 401 | } |
Wang Chen | cb75994 | 2007-12-03 22:33:28 +1100 | [diff] [blame] | 402 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 403 | sock_recv_ts_and_drops(msg, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
| 405 | /* Copy the address. */ |
| 406 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 407 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | sin6->sin6_family = AF_INET6; |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 409 | sin6->sin6_port = udp_hdr(skb)->source; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | sin6->sin6_flowinfo = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Hannes Frederic Sowa | 842df07 | 2013-03-08 02:07:19 +0000 | [diff] [blame] | 412 | if (is_udp4) { |
Brian Haley | b301e82 | 2009-10-07 13:58:25 -0700 | [diff] [blame] | 413 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
| 414 | &sin6->sin6_addr); |
Hannes Frederic Sowa | 842df07 | 2013-03-08 02:07:19 +0000 | [diff] [blame] | 415 | sin6->sin6_scope_id = 0; |
| 416 | } else { |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 417 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
Hannes Frederic Sowa | 842df07 | 2013-03-08 02:07:19 +0000 | [diff] [blame] | 418 | sin6->sin6_scope_id = |
| 419 | ipv6_iface_scope_id(&sin6->sin6_addr, |
Duan Jiong | 4330487 | 2014-08-01 09:52:58 +0800 | [diff] [blame] | 420 | inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
Hannes Frederic Sowa | bceaa90 | 2013-11-18 04:20:45 +0100 | [diff] [blame] | 422 | *addr_len = sizeof(*sin6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
Hannes Frederic Sowa | 4b261c7 | 2014-01-20 03:43:08 +0100 | [diff] [blame] | 424 | |
| 425 | if (np->rxopt.all) |
| 426 | ip6_datagram_recv_common_ctl(sk, msg, skb); |
| 427 | |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 428 | if (is_udp4) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | if (inet->cmsg_flags) |
Eric Dumazet | 10df8e6 | 2016-10-23 18:03:06 -0700 | [diff] [blame] | 430 | ip_cmsg_recv_offset(msg, skb, |
| 431 | sizeof(struct udphdr), off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | } else { |
| 433 | if (np->rxopt.all) |
Hannes Frederic Sowa | 4b261c7 | 2014-01-20 03:43:08 +0100 | [diff] [blame] | 434 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 435 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | |
David S. Miller | 59c2cda | 2011-12-01 14:12:55 -0500 | [diff] [blame] | 437 | err = copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | if (flags & MSG_TRUNC) |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 439 | err = ulen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
samanthakumar | 627d2d6 | 2016-04-05 12:41:16 -0400 | [diff] [blame] | 441 | __skb_free_datagram_locked(sk, skb, peeking ? -err : err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | return err; |
| 443 | |
| 444 | csum_copy_err: |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 445 | slow = lock_sock_fast(sk); |
Wei Yongjun | 0856f93 | 2008-11-02 16:14:27 +0000 | [diff] [blame] | 446 | if (!skb_kill_datagram(sk, skb, flags)) { |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 447 | if (is_udp4) { |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 448 | UDP_INC_STATS(sock_net(sk), |
| 449 | UDP_MIB_CSUMERRORS, is_udplite); |
| 450 | UDP_INC_STATS(sock_net(sk), |
| 451 | UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 452 | } else { |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 453 | UDP6_INC_STATS(sock_net(sk), |
| 454 | UDP_MIB_CSUMERRORS, is_udplite); |
| 455 | UDP6_INC_STATS(sock_net(sk), |
| 456 | UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 457 | } |
Wei Yongjun | 0856f93 | 2008-11-02 16:14:27 +0000 | [diff] [blame] | 458 | } |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 459 | unlock_sock_fast(sk, slow); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Eric Dumazet | beb39db | 2015-05-30 09:16:53 -0700 | [diff] [blame] | 461 | /* starting over for a new packet, but check if we need to yield */ |
| 462 | cond_resched(); |
Xufeng Zhang | 9cfaa8d | 2011-06-21 10:43:40 +0000 | [diff] [blame] | 463 | msg->msg_flags &= ~MSG_TRUNC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | goto try_again; |
| 465 | } |
| 466 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 467 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
Brian Haley | d5fdd6b | 2009-06-23 04:31:07 -0700 | [diff] [blame] | 468 | u8 type, u8 code, int offset, __be32 info, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 469 | struct udp_table *udptable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | { |
| 471 | struct ipv6_pinfo *np; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 472 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
| 473 | const struct in6_addr *saddr = &hdr->saddr; |
| 474 | const struct in6_addr *daddr = &hdr->daddr; |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 475 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | struct sock *sk; |
Wei Wang | e0d8c1b | 2016-02-17 13:58:22 -0800 | [diff] [blame] | 477 | int harderr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | int err; |
Duan Jiong | 7304fe4 | 2014-07-31 17:54:32 +0800 | [diff] [blame] | 479 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
Craig Gallek | e32ea7e | 2016-01-04 17:41:46 -0500 | [diff] [blame] | 481 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
Craig Gallek | 538950a | 2016-01-04 17:41:47 -0500 | [diff] [blame] | 482 | inet6_iif(skb), udptable, skb); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 483 | if (!sk) { |
Eric Dumazet | a16292a | 2016-04-27 16:44:36 -0700 | [diff] [blame] | 484 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
| 485 | ICMP6_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | return; |
Duan Jiong | 7304fe4 | 2014-07-31 17:54:32 +0800 | [diff] [blame] | 487 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
Wei Wang | e0d8c1b | 2016-02-17 13:58:22 -0800 | [diff] [blame] | 489 | harderr = icmpv6_err_convert(type, code, &err); |
| 490 | np = inet6_sk(sk); |
| 491 | |
Hannes Frederic Sowa | 93b36cf | 2013-12-15 03:41:14 +0100 | [diff] [blame] | 492 | if (type == ICMPV6_PKT_TOOBIG) { |
| 493 | if (!ip6_sk_accept_pmtu(sk)) |
| 494 | goto out; |
David S. Miller | 81aded2 | 2012-06-15 14:54:11 -0700 | [diff] [blame] | 495 | ip6_sk_update_pmtu(skb, sk, info); |
Wei Wang | e0d8c1b | 2016-02-17 13:58:22 -0800 | [diff] [blame] | 496 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
| 497 | harderr = 1; |
Hannes Frederic Sowa | 93b36cf | 2013-12-15 03:41:14 +0100 | [diff] [blame] | 498 | } |
Duan Jiong | 1a462d1 | 2013-09-20 18:20:28 +0800 | [diff] [blame] | 499 | if (type == NDISC_REDIRECT) { |
David S. Miller | ec18d9a | 2012-07-12 00:25:15 -0700 | [diff] [blame] | 500 | ip6_sk_redirect(skb, sk); |
Duan Jiong | 1a462d1 | 2013-09-20 18:20:28 +0800 | [diff] [blame] | 501 | goto out; |
| 502 | } |
David S. Miller | 81aded2 | 2012-06-15 14:54:11 -0700 | [diff] [blame] | 503 | |
Wei Wang | e0d8c1b | 2016-02-17 13:58:22 -0800 | [diff] [blame] | 504 | if (!np->recverr) { |
| 505 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
| 506 | goto out; |
| 507 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
Wei Wang | e0d8c1b | 2016-02-17 13:58:22 -0800 | [diff] [blame] | 509 | } |
Eric Dumazet | b1faf56 | 2010-05-31 23:44:05 -0700 | [diff] [blame] | 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | sk->sk_err = err; |
| 512 | sk->sk_error_report(sk); |
| 513 | out: |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 514 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | } |
| 516 | |
Eric Dumazet | 30c7be2 | 2016-11-22 09:06:45 -0800 | [diff] [blame] | 517 | int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
Benjamin LaHaise | f7ad74f | 2012-04-27 08:23:21 +0000 | [diff] [blame] | 518 | { |
| 519 | int rc; |
| 520 | |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 521 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
Benjamin LaHaise | f7ad74f | 2012-04-27 08:23:21 +0000 | [diff] [blame] | 522 | sock_rps_save_rxhash(sk, skb); |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 523 | sk_mark_napi_id(sk, skb); |
Eric Dumazet | 2c8c56e | 2014-11-11 05:54:28 -0800 | [diff] [blame] | 524 | sk_incoming_cpu_update(sk); |
Shawn Bohrer | 005ec97 | 2013-10-07 11:01:38 -0500 | [diff] [blame] | 525 | } |
Benjamin LaHaise | f7ad74f | 2012-04-27 08:23:21 +0000 | [diff] [blame] | 526 | |
samanthakumar | e6afc8a | 2016-04-05 12:41:15 -0400 | [diff] [blame] | 527 | rc = __sock_queue_rcv_skb(sk, skb); |
Benjamin LaHaise | f7ad74f | 2012-04-27 08:23:21 +0000 | [diff] [blame] | 528 | if (rc < 0) { |
| 529 | int is_udplite = IS_UDPLITE(sk); |
| 530 | |
| 531 | /* Note that an ENOMEM error is charged twice */ |
| 532 | if (rc == -ENOMEM) |
Eric Dumazet | e61da9e | 2016-04-29 14:16:50 -0700 | [diff] [blame] | 533 | UDP6_INC_STATS(sock_net(sk), |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 534 | UDP_MIB_RCVBUFERRORS, is_udplite); |
Eric Dumazet | e61da9e | 2016-04-29 14:16:50 -0700 | [diff] [blame] | 535 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Benjamin LaHaise | f7ad74f | 2012-04-27 08:23:21 +0000 | [diff] [blame] | 536 | kfree_skb(skb); |
| 537 | return -1; |
| 538 | } |
| 539 | return 0; |
| 540 | } |
| 541 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 542 | static __inline__ void udpv6_err(struct sk_buff *skb, |
Brian Haley | d5fdd6b | 2009-06-23 04:31:07 -0700 | [diff] [blame] | 543 | struct inet6_skb_parm *opt, u8 type, |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 544 | u8 code, int offset, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 546 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 547 | } |
| 548 | |
Benjamin LaHaise | d7f3f62 | 2012-04-27 08:24:08 +0000 | [diff] [blame] | 549 | static struct static_key udpv6_encap_needed __read_mostly; |
| 550 | void udpv6_encap_enable(void) |
| 551 | { |
| 552 | if (!static_key_enabled(&udpv6_encap_needed)) |
| 553 | static_key_slow_inc(&udpv6_encap_needed); |
| 554 | } |
| 555 | EXPORT_SYMBOL(udpv6_encap_enable); |
| 556 | |
Benjamin LaHaise | f7ad74f | 2012-04-27 08:23:21 +0000 | [diff] [blame] | 557 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 558 | { |
| 559 | struct udp_sock *up = udp_sk(sk); |
David S. Miller | a18135e | 2006-08-15 00:00:09 -0700 | [diff] [blame] | 560 | int rc; |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 561 | int is_udplite = IS_UDPLITE(sk); |
David S. Miller | a18135e | 2006-08-15 00:00:09 -0700 | [diff] [blame] | 562 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 563 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 564 | goto drop; |
| 565 | |
Benjamin LaHaise | d7f3f62 | 2012-04-27 08:24:08 +0000 | [diff] [blame] | 566 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
| 567 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
| 568 | |
| 569 | /* |
| 570 | * This is an encapsulation socket so pass the skb to |
| 571 | * the socket's udp_encap_rcv() hook. Otherwise, just |
| 572 | * fall through and pass this up the UDP socket. |
| 573 | * up->encap_rcv() returns the following value: |
| 574 | * =0 if skb was successfully passed to the encap |
| 575 | * handler or was discarded by it. |
| 576 | * >0 if skb should be passed on to UDP. |
| 577 | * <0 if skb should be resubmitted as proto -N |
| 578 | */ |
| 579 | |
| 580 | /* if we're overly short, let UDP handle it */ |
| 581 | encap_rcv = ACCESS_ONCE(up->encap_rcv); |
Hannes Frederic Sowa | e5aed00 | 2016-05-19 15:58:33 +0200 | [diff] [blame] | 582 | if (encap_rcv) { |
Benjamin LaHaise | d7f3f62 | 2012-04-27 08:24:08 +0000 | [diff] [blame] | 583 | int ret; |
| 584 | |
Tom Herbert | 0a80966 | 2014-05-07 16:52:39 -0700 | [diff] [blame] | 585 | /* Verify checksum before giving to encap */ |
| 586 | if (udp_lib_checksum_complete(skb)) |
| 587 | goto csum_error; |
| 588 | |
Benjamin LaHaise | d7f3f62 | 2012-04-27 08:24:08 +0000 | [diff] [blame] | 589 | ret = encap_rcv(sk, skb); |
| 590 | if (ret <= 0) { |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 591 | __UDP_INC_STATS(sock_net(sk), |
| 592 | UDP_MIB_INDATAGRAMS, |
| 593 | is_udplite); |
Benjamin LaHaise | d7f3f62 | 2012-04-27 08:24:08 +0000 | [diff] [blame] | 594 | return -ret; |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | /* FALLTHROUGH -- it's a UDP Packet */ |
| 599 | } |
| 600 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 601 | /* |
| 602 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). |
| 603 | */ |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 604 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 605 | |
| 606 | if (up->pcrlen == 0) { /* full coverage was set */ |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 607 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
| 608 | UDP_SKB_CB(skb)->cscov, skb->len); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 609 | goto drop; |
| 610 | } |
| 611 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 612 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
| 613 | UDP_SKB_CB(skb)->cscov, up->pcrlen); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 614 | goto drop; |
| 615 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | } |
| 617 | |
Eric Dumazet | ce25d66 | 2016-06-02 14:52:43 -0700 | [diff] [blame] | 618 | if (rcu_access_pointer(sk->sk_filter) && |
| 619 | udp_lib_checksum_complete(skb)) |
| 620 | goto csum_error; |
| 621 | |
Daniel Borkmann | ba66bbe | 2016-07-25 18:06:12 +0200 | [diff] [blame] | 622 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) |
Michal Kubeček | a612769 | 2016-07-08 17:52:33 +0200 | [diff] [blame] | 623 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
samanthakumar | e6afc8a | 2016-04-05 12:41:15 -0400 | [diff] [blame] | 625 | udp_csum_pull_header(skb); |
Sorin Dumitru | 274f482 | 2014-07-22 21:16:51 +0300 | [diff] [blame] | 626 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 627 | __UDP6_INC_STATS(sock_net(sk), |
| 628 | UDP_MIB_RCVBUFERRORS, is_udplite); |
Benjamin LaHaise | cb80ef4 | 2012-04-27 08:23:59 +0000 | [diff] [blame] | 629 | goto drop; |
James M Leddy | 3e215c8 | 2014-06-25 17:38:13 -0400 | [diff] [blame] | 630 | } |
Benjamin LaHaise | cb80ef4 | 2012-04-27 08:23:59 +0000 | [diff] [blame] | 631 | |
Eric Dumazet | d826eb1 | 2011-11-09 07:24:35 +0000 | [diff] [blame] | 632 | skb_dst_drop(skb); |
Wang Chen | cb75994 | 2007-12-03 22:33:28 +1100 | [diff] [blame] | 633 | |
Benjamin LaHaise | cb80ef4 | 2012-04-27 08:23:59 +0000 | [diff] [blame] | 634 | bh_lock_sock(sk); |
| 635 | rc = 0; |
| 636 | if (!sock_owned_by_user(sk)) |
| 637 | rc = __udpv6_queue_rcv_skb(sk, skb); |
| 638 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
| 639 | bh_unlock_sock(sk); |
| 640 | goto drop; |
| 641 | } |
| 642 | bh_unlock_sock(sk); |
Benjamin LaHaise | f7ad74f | 2012-04-27 08:23:21 +0000 | [diff] [blame] | 643 | |
| 644 | return rc; |
James M Leddy | 3e215c8 | 2014-06-25 17:38:13 -0400 | [diff] [blame] | 645 | |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 646 | csum_error: |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 647 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 648 | drop: |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 649 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Benjamin LaHaise | cb80ef4 | 2012-04-27 08:23:59 +0000 | [diff] [blame] | 650 | atomic_inc(&sk->sk_drops); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 651 | kfree_skb(skb); |
| 652 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
| 654 | |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 655 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
| 656 | __be16 loc_port, const struct in6_addr *loc_addr, |
| 657 | __be16 rmt_port, const struct in6_addr *rmt_addr, |
| 658 | int dif, unsigned short hnum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | { |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 660 | struct inet_sock *inet = inet_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 662 | if (!net_eq(sock_net(sk), net)) |
| 663 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 665 | if (udp_sk(sk)->udp_port_hash != hnum || |
| 666 | sk->sk_family != PF_INET6 || |
| 667 | (inet->inet_dport && inet->inet_dport != rmt_port) || |
| 668 | (!ipv6_addr_any(&sk->sk_v6_daddr) && |
| 669 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || |
Henning Rogge | 33b4b01 | 2015-05-18 21:08:49 +0200 | [diff] [blame] | 670 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
| 671 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
| 672 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 673 | return false; |
| 674 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) |
| 675 | return false; |
| 676 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | } |
| 678 | |
Tom Herbert | 4068579 | 2014-05-02 16:29:58 -0700 | [diff] [blame] | 679 | static void udp6_csum_zero_error(struct sk_buff *skb) |
| 680 | { |
| 681 | /* RFC 2460 section 8.1 says that we SHOULD log |
| 682 | * this error. Well, it is reasonable. |
| 683 | */ |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 684 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
| 685 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), |
| 686 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); |
Tom Herbert | 4068579 | 2014-05-02 16:29:58 -0700 | [diff] [blame] | 687 | } |
| 688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | /* |
| 690 | * Note: called only from the BH handler context, |
| 691 | * so we don't need to lock the hashes. |
| 692 | */ |
Pavel Emelyanov | e316349 | 2008-06-16 17:12:11 -0700 | [diff] [blame] | 693 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 694 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 695 | struct udp_table *udptable, int proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | { |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 697 | struct sock *sk, *first = NULL; |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 698 | const struct udphdr *uh = udp_hdr(skb); |
David Held | 5cf3d46 | 2014-07-15 23:28:31 -0400 | [diff] [blame] | 699 | unsigned short hnum = ntohs(uh->dest); |
| 700 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 701 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 702 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 703 | int dif = inet6_iif(skb); |
| 704 | struct hlist_node *node; |
| 705 | struct sk_buff *nskb; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 706 | |
| 707 | if (use_hash2) { |
| 708 | hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & |
Pablo Neira | 73e2d5e | 2016-11-14 23:40:30 +0100 | [diff] [blame] | 709 | udptable->mask; |
| 710 | hash2 = udp6_portaddr_hash(net, daddr, hnum) & udptable->mask; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 711 | start_lookup: |
Pablo Neira | 73e2d5e | 2016-11-14 23:40:30 +0100 | [diff] [blame] | 712 | hslot = &udptable->hash2[hash2]; |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 713 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
| 714 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 716 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
| 717 | if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, |
| 718 | uh->source, saddr, dif, hnum)) |
| 719 | continue; |
| 720 | /* If zero checksum and no_check is not on for |
| 721 | * the socket then skip it. |
| 722 | */ |
| 723 | if (!uh->check && !udp_sk(sk)->no_check6_rx) |
| 724 | continue; |
| 725 | if (!first) { |
| 726 | first = sk; |
| 727 | continue; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 728 | } |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 729 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 730 | if (unlikely(!nskb)) { |
| 731 | atomic_inc(&sk->sk_drops); |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 732 | __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
| 733 | IS_UDPLITE(sk)); |
| 734 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, |
| 735 | IS_UDPLITE(sk)); |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 736 | continue; |
| 737 | } |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 738 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 739 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
| 740 | consume_skb(nskb); |
| 741 | } |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 742 | |
David Held | 2dc41cf | 2014-07-15 23:28:32 -0400 | [diff] [blame] | 743 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
| 744 | if (use_hash2 && hash2 != hash2_any) { |
| 745 | hash2 = hash2_any; |
| 746 | goto start_lookup; |
| 747 | } |
| 748 | |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 749 | if (first) { |
| 750 | if (udpv6_queue_rcv_skb(first, skb) > 0) |
| 751 | consume_skb(skb); |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 752 | } else { |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 753 | kfree_skb(skb); |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 754 | __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
| 755 | proto == IPPROTO_UDPLITE); |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 756 | } |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 757 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | } |
| 759 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 760 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 761 | int proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 763 | const struct in6_addr *saddr, *daddr; |
Eric Dumazet | ca065d0 | 2016-04-01 08:52:13 -0700 | [diff] [blame] | 764 | struct net *net = dev_net(skb->dev); |
| 765 | struct udphdr *uh; |
| 766 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | u32 ulen = 0; |
| 768 | |
| 769 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
Bjørn Mork | d6bc014 | 2010-05-06 03:44:35 +0000 | [diff] [blame] | 770 | goto discard; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 772 | saddr = &ipv6_hdr(skb)->saddr; |
| 773 | daddr = &ipv6_hdr(skb)->daddr; |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 774 | uh = udp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
| 776 | ulen = ntohs(uh->len); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 777 | if (ulen > skb->len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | goto short_packet; |
| 779 | |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 780 | if (proto == IPPROTO_UDP) { |
| 781 | /* UDP validates ulen. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 783 | /* Check for jumbo payload */ |
| 784 | if (ulen == 0) |
| 785 | ulen = skb->len; |
| 786 | |
| 787 | if (ulen < sizeof(*uh)) |
| 788 | goto short_packet; |
| 789 | |
| 790 | if (ulen < skb->len) { |
| 791 | if (pskb_trim_rcsum(skb, ulen)) |
| 792 | goto short_packet; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 793 | saddr = &ipv6_hdr(skb)->saddr; |
| 794 | daddr = &ipv6_hdr(skb)->daddr; |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 795 | uh = udp_hdr(skb); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 796 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | } |
| 798 | |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 799 | if (udp6_csum_init(skb, uh, proto)) |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 800 | goto csum_error; |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 801 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 802 | /* |
| 803 | * Multicast receive code |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 805 | if (ipv6_addr_is_multicast(daddr)) |
Pavel Emelyanov | e316349 | 2008-06-16 17:12:11 -0700 | [diff] [blame] | 806 | return __udp6_lib_mcast_deliver(net, skb, |
Rick Jones | 36cbb24 | 2014-11-06 10:37:54 -0800 | [diff] [blame] | 807 | saddr, daddr, udptable, proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
| 809 | /* Unicast */ |
| 810 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 811 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | * check socket cache ... must talk to Alan about his plans |
| 813 | * for sock caches... i'll skip this for now. |
| 814 | */ |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 815 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
Ian Morris | 53b24b8 | 2015-03-29 14:00:05 +0100 | [diff] [blame] | 816 | if (sk) { |
Eliezer Tamir | a5b5047 | 2013-06-10 11:40:00 +0300 | [diff] [blame] | 817 | int ret; |
| 818 | |
Tom Herbert | 1c19448 | 2014-05-23 08:47:32 -0700 | [diff] [blame] | 819 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
Tom Herbert | 4068579 | 2014-05-02 16:29:58 -0700 | [diff] [blame] | 820 | udp6_csum_zero_error(skb); |
| 821 | goto csum_error; |
| 822 | } |
| 823 | |
Tom Herbert | 224d019 | 2015-01-05 13:56:14 -0800 | [diff] [blame] | 824 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
Tom Herbert | 2abb7cd | 2014-08-31 15:12:43 -0700 | [diff] [blame] | 825 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
| 826 | ip6_compute_pseudo); |
| 827 | |
Eliezer Tamir | a5b5047 | 2013-06-10 11:40:00 +0300 | [diff] [blame] | 828 | ret = udpv6_queue_rcv_skb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
Bill Sommerfeld | 59dca1d | 2016-03-04 14:47:21 -0800 | [diff] [blame] | 830 | /* a return value > 0 means to resubmit the input */ |
Benjamin LaHaise | cb80ef4 | 2012-04-27 08:23:59 +0000 | [diff] [blame] | 831 | if (ret > 0) |
Bill Sommerfeld | 59dca1d | 2016-03-04 14:47:21 -0800 | [diff] [blame] | 832 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
Stephen Hemminger | add459a | 2007-03-08 20:42:35 -0800 | [diff] [blame] | 834 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 836 | |
Tom Herbert | 4068579 | 2014-05-02 16:29:58 -0700 | [diff] [blame] | 837 | if (!uh->check) { |
| 838 | udp6_csum_zero_error(skb); |
| 839 | goto csum_error; |
| 840 | } |
| 841 | |
Benjamin LaHaise | cb80ef4 | 2012-04-27 08:23:59 +0000 | [diff] [blame] | 842 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 843 | goto discard; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 844 | |
Benjamin LaHaise | cb80ef4 | 2012-04-27 08:23:59 +0000 | [diff] [blame] | 845 | if (udp_lib_checksum_complete(skb)) |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 846 | goto csum_error; |
Benjamin LaHaise | cb80ef4 | 2012-04-27 08:23:59 +0000 | [diff] [blame] | 847 | |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 848 | __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
Benjamin LaHaise | cb80ef4 | 2012-04-27 08:23:59 +0000 | [diff] [blame] | 849 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
| 850 | |
| 851 | kfree_skb(skb); |
Stephen Hemminger | add459a | 2007-03-08 20:42:35 -0800 | [diff] [blame] | 852 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 854 | short_packet: |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 855 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
| 856 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
| 857 | saddr, ntohs(uh->source), |
| 858 | ulen, skb->len, |
| 859 | daddr, ntohs(uh->dest)); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 860 | goto discard; |
| 861 | csum_error: |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 862 | __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | discard: |
Eric Dumazet | 02c2234 | 2016-04-27 16:44:30 -0700 | [diff] [blame] | 864 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | kfree_skb(skb); |
Stephen Hemminger | add459a | 2007-03-08 20:42:35 -0800 | [diff] [blame] | 866 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 868 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 869 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 870 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 871 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 872 | } |
| 873 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | /* |
| 875 | * Throw away all pending data and cancel the corking. Socket is locked. |
| 876 | */ |
| 877 | static void udp_v6_flush_pending_frames(struct sock *sk) |
| 878 | { |
| 879 | struct udp_sock *up = udp_sk(sk); |
| 880 | |
Denis V. Lunev | 36d926b | 2008-06-04 15:49:07 +0400 | [diff] [blame] | 881 | if (up->pending == AF_INET) |
| 882 | udp_flush_pending_frames(sk); |
| 883 | else if (up->pending) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | up->len = 0; |
| 885 | up->pending = 0; |
| 886 | ip6_flush_pending_frames(sk); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 887 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | } |
| 889 | |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 890 | /** |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 891 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
| 892 | * @sk: socket we are sending on |
| 893 | * @skb: sk_buff containing the filled-in UDP header |
| 894 | * (checksum field must be zeroed out) |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 895 | */ |
| 896 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, |
| 897 | const struct in6_addr *saddr, |
| 898 | const struct in6_addr *daddr, int len) |
| 899 | { |
| 900 | unsigned int offset; |
| 901 | struct udphdr *uh = udp_hdr(skb); |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 902 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 903 | __wsum csum = 0; |
| 904 | |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 905 | if (!frags) { |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 906 | /* Only one fragment on the socket. */ |
| 907 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 908 | skb->csum_offset = offsetof(struct udphdr, check); |
| 909 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); |
| 910 | } else { |
| 911 | /* |
| 912 | * HW-checksum won't work as there are two or more |
| 913 | * fragments on the socket so that all csums of sk_buffs |
| 914 | * should be together |
| 915 | */ |
| 916 | offset = skb_transport_offset(skb); |
| 917 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
Subash Abhinov Kasiviswanathan | df3b883 | 2017-09-13 17:56:39 -0600 | [diff] [blame] | 918 | csum = skb->csum; |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 919 | |
| 920 | skb->ip_summed = CHECKSUM_NONE; |
| 921 | |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 922 | do { |
| 923 | csum = csum_add(csum, frags->csum); |
| 924 | } while ((frags = frags->next)); |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 925 | |
| 926 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, |
| 927 | csum); |
| 928 | if (uh->check == 0) |
| 929 | uh->check = CSUM_MANGLED_0; |
| 930 | } |
| 931 | } |
| 932 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | /* |
| 934 | * Sending |
| 935 | */ |
| 936 | |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 937 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | { |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 939 | struct sock *sk = skb->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | struct udphdr *uh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | int err = 0; |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 942 | int is_udplite = IS_UDPLITE(sk); |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 943 | __wsum csum = 0; |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 944 | int offset = skb_transport_offset(skb); |
| 945 | int len = skb->len - offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | |
| 947 | /* |
| 948 | * Create a UDP header |
| 949 | */ |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 950 | uh = udp_hdr(skb); |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 951 | uh->source = fl6->fl6_sport; |
| 952 | uh->dest = fl6->fl6_dport; |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 953 | uh->len = htons(len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | uh->check = 0; |
| 955 | |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 956 | if (is_udplite) |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 957 | csum = udplite_csum(skb); |
| 958 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ |
Tom Herbert | 4068579 | 2014-05-02 16:29:58 -0700 | [diff] [blame] | 959 | skb->ip_summed = CHECKSUM_NONE; |
| 960 | goto send; |
| 961 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 962 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 963 | goto send; |
| 964 | } else |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 965 | csum = udp_csum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 967 | /* add protocol-dependent pseudo-header */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 968 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 969 | len, fl6->flowi6_proto, csum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | if (uh->check == 0) |
Al Viro | f6ab028 | 2006-11-16 02:36:50 -0800 | [diff] [blame] | 971 | uh->check = CSUM_MANGLED_0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 973 | send: |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 974 | err = ip6_send_skb(skb); |
Eric Dumazet | 6ce9e7b | 2009-09-02 18:05:33 -0700 | [diff] [blame] | 975 | if (err) { |
| 976 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 977 | UDP6_INC_STATS(sock_net(sk), |
| 978 | UDP_MIB_SNDBUFERRORS, is_udplite); |
Eric Dumazet | 6ce9e7b | 2009-09-02 18:05:33 -0700 | [diff] [blame] | 979 | err = 0; |
| 980 | } |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 981 | } else { |
| 982 | UDP6_INC_STATS(sock_net(sk), |
| 983 | UDP_MIB_OUTDATAGRAMS, is_udplite); |
| 984 | } |
Vlad Yasevich | d39d938 | 2015-01-31 10:40:16 -0500 | [diff] [blame] | 985 | return err; |
| 986 | } |
| 987 | |
| 988 | static int udp_v6_push_pending_frames(struct sock *sk) |
| 989 | { |
| 990 | struct sk_buff *skb; |
| 991 | struct udp_sock *up = udp_sk(sk); |
| 992 | struct flowi6 fl6; |
| 993 | int err = 0; |
| 994 | |
| 995 | if (up->pending == AF_INET) |
| 996 | return udp_push_pending_frames(sk); |
| 997 | |
| 998 | /* ip6_finish_skb will release the cork, so make a copy of |
| 999 | * fl6 here. |
| 1000 | */ |
| 1001 | fl6 = inet_sk(sk)->cork.fl.u.ip6; |
| 1002 | |
| 1003 | skb = ip6_finish_skb(sk); |
| 1004 | if (!skb) |
| 1005 | goto out; |
| 1006 | |
| 1007 | err = udp_v6_send_skb(skb, &fl6); |
| 1008 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | out: |
| 1010 | up->len = 0; |
| 1011 | up->pending = 0; |
| 1012 | return err; |
| 1013 | } |
| 1014 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1015 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | { |
| 1017 | struct ipv6_txoptions opt_space; |
| 1018 | struct udp_sock *up = udp_sk(sk); |
| 1019 | struct inet_sock *inet = inet_sk(sk); |
| 1020 | struct ipv6_pinfo *np = inet6_sk(sk); |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 1021 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 1022 | struct in6_addr *daddr, *final_p, final; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | struct ipv6_txoptions *opt = NULL; |
Eric Dumazet | 45f6fad | 2015-11-29 19:37:57 -0800 | [diff] [blame] | 1024 | struct ipv6_txoptions *opt_to_free = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | struct ip6_flowlabel *flowlabel = NULL; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1026 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | struct dst_entry *dst; |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1028 | struct ipcm6_cookie ipc6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | int addr_len = msg->msg_namelen; |
| 1030 | int ulen = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
| 1032 | int err; |
Mitsuru KANDA | 987905d | 2005-09-18 00:30:08 -0700 | [diff] [blame] | 1033 | int connected = 0; |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 1034 | int is_udplite = IS_UDPLITE(sk); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1035 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
Soheil Hassas Yeganeh | ad1e46a | 2016-04-02 23:08:11 -0400 | [diff] [blame] | 1036 | struct sockcm_cookie sockc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1038 | ipc6.hlimit = -1; |
| 1039 | ipc6.tclass = -1; |
| 1040 | ipc6.dontfrag = -1; |
Alexander Potapenko | d80caeb | 2017-03-21 17:14:27 +0100 | [diff] [blame] | 1041 | sockc.tsflags = sk->sk_tsflags; |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | /* destination address check */ |
| 1044 | if (sin6) { |
| 1045 | if (addr_len < offsetof(struct sockaddr, sa_data)) |
| 1046 | return -EINVAL; |
| 1047 | |
| 1048 | switch (sin6->sin6_family) { |
| 1049 | case AF_INET6: |
| 1050 | if (addr_len < SIN6_LEN_RFC2133) |
| 1051 | return -EINVAL; |
| 1052 | daddr = &sin6->sin6_addr; |
Jonathan T. Leighton | 12ec256 | 2017-05-23 21:53:33 -0400 | [diff] [blame] | 1053 | if (ipv6_addr_any(daddr) && |
| 1054 | ipv6_addr_v4mapped(&np->saddr)) |
| 1055 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), |
| 1056 | daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | break; |
| 1058 | case AF_INET: |
| 1059 | goto do_udp_sendmsg; |
| 1060 | case AF_UNSPEC: |
| 1061 | msg->msg_name = sin6 = NULL; |
| 1062 | msg->msg_namelen = addr_len = 0; |
| 1063 | daddr = NULL; |
| 1064 | break; |
| 1065 | default: |
| 1066 | return -EINVAL; |
| 1067 | } |
| 1068 | } else if (!up->pending) { |
| 1069 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1070 | return -EDESTADDRREQ; |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 1071 | daddr = &sk->sk_v6_daddr; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1072 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | daddr = NULL; |
| 1074 | |
| 1075 | if (daddr) { |
Brian Haley | e773e4f | 2007-08-24 23:16:08 -0700 | [diff] [blame] | 1076 | if (ipv6_addr_v4mapped(daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | struct sockaddr_in sin; |
| 1078 | sin.sin_family = AF_INET; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1079 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
| 1081 | msg->msg_name = &sin; |
| 1082 | msg->msg_namelen = sizeof(sin); |
| 1083 | do_udp_sendmsg: |
| 1084 | if (__ipv6_only_sock(sk)) |
| 1085 | return -ENETUNREACH; |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1086 | return udp_sendmsg(sk, msg, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | } |
| 1088 | } |
| 1089 | |
| 1090 | if (up->pending == AF_INET) |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1091 | return udp_sendmsg(sk, msg, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | |
| 1093 | /* Rough check on arithmetic overflow, |
YOSHIFUJI Hideaki | b59e139 | 2007-03-30 14:45:35 -0700 | [diff] [blame] | 1094 | better check is made in ip6_append_data(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | */ |
| 1096 | if (len > INT_MAX - sizeof(struct udphdr)) |
| 1097 | return -EMSGSIZE; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1098 | |
Vlad Yasevich | 03485f2 | 2015-01-31 10:40:17 -0500 | [diff] [blame] | 1099 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | if (up->pending) { |
| 1101 | /* |
| 1102 | * There are pending frames. |
| 1103 | * The socket lock must be held while it's corked. |
| 1104 | */ |
| 1105 | lock_sock(sk); |
| 1106 | if (likely(up->pending)) { |
| 1107 | if (unlikely(up->pending != AF_INET6)) { |
| 1108 | release_sock(sk); |
| 1109 | return -EAFNOSUPPORT; |
| 1110 | } |
| 1111 | dst = NULL; |
| 1112 | goto do_append_data; |
| 1113 | } |
| 1114 | release_sock(sk); |
| 1115 | } |
| 1116 | ulen += sizeof(struct udphdr); |
| 1117 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1118 | memset(&fl6, 0, sizeof(fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | |
| 1120 | if (sin6) { |
| 1121 | if (sin6->sin6_port == 0) |
| 1122 | return -EINVAL; |
| 1123 | |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 1124 | fl6.fl6_dport = sin6->sin6_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | daddr = &sin6->sin6_addr; |
| 1126 | |
| 1127 | if (np->sndflow) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1128 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| 1129 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { |
| 1130 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1131 | if (!flowlabel) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | } |
| 1134 | } |
| 1135 | |
| 1136 | /* |
| 1137 | * Otherwise it will be difficult to maintain |
| 1138 | * sk->sk_dst_cache. |
| 1139 | */ |
| 1140 | if (sk->sk_state == TCP_ESTABLISHED && |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 1141 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
| 1142 | daddr = &sk->sk_v6_daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | |
| 1144 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 1145 | sin6->sin6_scope_id && |
Hannes Frederic Sowa | 842df07 | 2013-03-08 02:07:19 +0000 | [diff] [blame] | 1146 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1147 | fl6.flowi6_oif = sin6->sin6_scope_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | } else { |
| 1149 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1150 | return -EDESTADDRREQ; |
| 1151 | |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 1152 | fl6.fl6_dport = inet->inet_dport; |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 1153 | daddr = &sk->sk_v6_daddr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1154 | fl6.flowlabel = np->flow_label; |
Mitsuru KANDA | 987905d | 2005-09-18 00:30:08 -0700 | [diff] [blame] | 1155 | connected = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | } |
| 1157 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1158 | if (!fl6.flowi6_oif) |
| 1159 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1161 | if (!fl6.flowi6_oif) |
| 1162 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; |
Yang Hongyang | 9f690db | 2008-12-16 02:08:29 -0800 | [diff] [blame] | 1163 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1164 | fl6.flowi6_mark = sk->sk_mark; |
Lorenzo Colitti | 5044292 | 2016-11-04 02:23:43 +0900 | [diff] [blame] | 1165 | fl6.flowi6_uid = sk->sk_uid; |
Brian Haley | 51953d5 | 2009-10-05 08:24:16 +0000 | [diff] [blame] | 1166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | if (msg->msg_controllen) { |
| 1168 | opt = &opt_space; |
| 1169 | memset(opt, 0, sizeof(struct ipv6_txoptions)); |
| 1170 | opt->tot_len = sizeof(*opt); |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1171 | ipc6.opt = opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1173 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | if (err < 0) { |
| 1175 | fl6_sock_release(flowlabel); |
| 1176 | return err; |
| 1177 | } |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1178 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
| 1179 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1180 | if (!flowlabel) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | return -EINVAL; |
| 1182 | } |
| 1183 | if (!(opt->opt_nflen|opt->opt_flen)) |
| 1184 | opt = NULL; |
Mitsuru KANDA | 987905d | 2005-09-18 00:30:08 -0700 | [diff] [blame] | 1185 | connected = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | } |
Eric Dumazet | 45f6fad | 2015-11-29 19:37:57 -0800 | [diff] [blame] | 1187 | if (!opt) { |
| 1188 | opt = txopt_get(np); |
| 1189 | opt_to_free = opt; |
| 1190 | } |
YOSHIFUJI Hideaki | df9890c | 2005-11-20 12:23:18 +0900 | [diff] [blame] | 1191 | if (flowlabel) |
| 1192 | opt = fl6_merge_options(&opt_space, flowlabel, opt); |
| 1193 | opt = ipv6_fixup_options(&opt_space, opt); |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1194 | ipc6.opt = opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1196 | fl6.flowi6_proto = sk->sk_protocol; |
Brian Haley | 876c7f4 | 2008-04-11 00:38:24 -0400 | [diff] [blame] | 1197 | if (!ipv6_addr_any(daddr)) |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1198 | fl6.daddr = *daddr; |
Brian Haley | 876c7f4 | 2008-04-11 00:38:24 -0400 | [diff] [blame] | 1199 | else |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1200 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
| 1201 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1202 | fl6.saddr = np->saddr; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 1203 | fl6.fl6_sport = inet->inet_sport; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1204 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1205 | final_p = fl6_update_dst(&fl6, opt, &final); |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 1206 | if (final_p) |
Mitsuru KANDA | 987905d | 2005-09-18 00:30:08 -0700 | [diff] [blame] | 1207 | connected = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1209 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
| 1210 | fl6.flowi6_oif = np->mcast_oif; |
Mitsuru KANDA | 987905d | 2005-09-18 00:30:08 -0700 | [diff] [blame] | 1211 | connected = 0; |
Erich E. Hoover | c4062df | 2012-02-08 09:11:08 +0000 | [diff] [blame] | 1212 | } else if (!fl6.flowi6_oif) |
| 1213 | fl6.flowi6_oif = np->ucast_oif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1215 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 1216 | |
Hannes Frederic Sowa | 38b7097 | 2016-06-11 20:08:19 +0200 | [diff] [blame] | 1217 | if (ipc6.tclass < 0) |
| 1218 | ipc6.tclass = np->tclass; |
| 1219 | |
| 1220 | fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); |
| 1221 | |
Steffen Klassert | 0e0d44a | 2013-08-28 08:04:14 +0200 | [diff] [blame] | 1222 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1223 | if (IS_ERR(dst)) { |
| 1224 | err = PTR_ERR(dst); |
| 1225 | dst = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | goto out; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 1227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1229 | if (ipc6.hlimit < 0) |
| 1230 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | |
| 1232 | if (msg->msg_flags&MSG_CONFIRM) |
| 1233 | goto do_confirm; |
| 1234 | back_from_confirm: |
| 1235 | |
Vlad Yasevich | 03485f2 | 2015-01-31 10:40:17 -0500 | [diff] [blame] | 1236 | /* Lockless fast path for the non-corking case */ |
| 1237 | if (!corkreq) { |
| 1238 | struct sk_buff *skb; |
| 1239 | |
| 1240 | skb = ip6_make_skb(sk, getfrag, msg, ulen, |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1241 | sizeof(struct udphdr), &ipc6, |
Vlad Yasevich | 03485f2 | 2015-01-31 10:40:17 -0500 | [diff] [blame] | 1242 | &fl6, (struct rt6_info *)dst, |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1243 | msg->msg_flags, &sockc); |
Vlad Yasevich | 03485f2 | 2015-01-31 10:40:17 -0500 | [diff] [blame] | 1244 | err = PTR_ERR(skb); |
| 1245 | if (!IS_ERR_OR_NULL(skb)) |
| 1246 | err = udp_v6_send_skb(skb, &fl6); |
| 1247 | goto release_dst; |
| 1248 | } |
| 1249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | lock_sock(sk); |
| 1251 | if (unlikely(up->pending)) { |
| 1252 | /* The socket is already corked while preparing it. */ |
| 1253 | /* ... which is an evident application bug. --ANK */ |
| 1254 | release_sock(sk); |
| 1255 | |
Joe Perches | ba7a46f | 2014-11-11 10:59:17 -0800 | [diff] [blame] | 1256 | net_dbg_ratelimited("udp cork app bug 2\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | err = -EINVAL; |
| 1258 | goto out; |
| 1259 | } |
| 1260 | |
| 1261 | up->pending = AF_INET6; |
| 1262 | |
| 1263 | do_append_data: |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1264 | if (ipc6.dontfrag < 0) |
| 1265 | ipc6.dontfrag = np->dontfrag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | up->len += ulen; |
Wei Wang | 26879da | 2016-05-02 21:40:07 -0700 | [diff] [blame] | 1267 | err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), |
| 1268 | &ipc6, &fl6, (struct rt6_info *)dst, |
| 1269 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | if (err) |
| 1271 | udp_v6_flush_pending_frames(sk); |
| 1272 | else if (!corkreq) |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1273 | err = udp_v6_push_pending_frames(sk); |
Herbert Xu | 1e0c14f | 2006-10-03 14:35:49 -0700 | [diff] [blame] | 1274 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
| 1275 | up->pending = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | |
Vlad Yasevich | 03485f2 | 2015-01-31 10:40:17 -0500 | [diff] [blame] | 1277 | if (err > 0) |
| 1278 | err = np->recverr ? net_xmit_errno(err) : 0; |
| 1279 | release_sock(sk); |
| 1280 | |
| 1281 | release_dst: |
David S. Miller | a5e7c21 | 2005-10-03 14:21:58 -0700 | [diff] [blame] | 1282 | if (dst) { |
| 1283 | if (connected) { |
| 1284 | ip6_dst_store(sk, dst, |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 1285 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
| 1286 | &sk->sk_v6_daddr : NULL, |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 1287 | #ifdef CONFIG_IPV6_SUBTREES |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1288 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 1289 | &np->saddr : |
| 1290 | #endif |
| 1291 | NULL); |
David S. Miller | a5e7c21 | 2005-10-03 14:21:58 -0700 | [diff] [blame] | 1292 | } else { |
| 1293 | dst_release(dst); |
| 1294 | } |
YOSHIFUJI Hideaki | a3c9608 | 2008-06-04 01:30:25 +0900 | [diff] [blame] | 1295 | dst = NULL; |
David S. Miller | a5e7c21 | 2005-10-03 14:21:58 -0700 | [diff] [blame] | 1296 | } |
| 1297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | out: |
YOSHIFUJI Hideaki | a3c9608 | 2008-06-04 01:30:25 +0900 | [diff] [blame] | 1299 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | fl6_sock_release(flowlabel); |
Eric Dumazet | 45f6fad | 2015-11-29 19:37:57 -0800 | [diff] [blame] | 1301 | txopt_put(opt_to_free); |
YOSHIFUJI Hideaki | cd562c9 | 2007-09-14 17:15:01 -0700 | [diff] [blame] | 1302 | if (!err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | return len; |
David S. Miller | a18135e | 2006-08-15 00:00:09 -0700 | [diff] [blame] | 1304 | /* |
| 1305 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting |
| 1306 | * ENOBUFS might not be good (it's not tunable per se), but otherwise |
| 1307 | * we don't have a good statistic (IpOutDiscards but it can be too many |
| 1308 | * things). We could add another new stat but at least for now that |
| 1309 | * seems like overkill. |
| 1310 | */ |
| 1311 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { |
Eric Dumazet | 6aef70a | 2016-04-27 16:44:27 -0700 | [diff] [blame] | 1312 | UDP6_INC_STATS(sock_net(sk), |
| 1313 | UDP_MIB_SNDBUFERRORS, is_udplite); |
David S. Miller | a18135e | 2006-08-15 00:00:09 -0700 | [diff] [blame] | 1314 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | return err; |
| 1316 | |
| 1317 | do_confirm: |
| 1318 | dst_confirm(dst); |
| 1319 | if (!(msg->msg_flags&MSG_PROBE) || len) |
| 1320 | goto back_from_confirm; |
| 1321 | err = 0; |
| 1322 | goto out; |
| 1323 | } |
| 1324 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1325 | void udpv6_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | { |
Tom Parkin | 44046a5 | 2013-03-19 06:11:12 +0000 | [diff] [blame] | 1327 | struct udp_sock *up = udp_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | lock_sock(sk); |
| 1329 | udp_v6_flush_pending_frames(sk); |
| 1330 | release_sock(sk); |
| 1331 | |
Tom Parkin | 44046a5 | 2013-03-19 06:11:12 +0000 | [diff] [blame] | 1332 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
| 1333 | void (*encap_destroy)(struct sock *sk); |
| 1334 | encap_destroy = ACCESS_ONCE(up->encap_destroy); |
| 1335 | if (encap_destroy) |
| 1336 | encap_destroy(sk); |
| 1337 | } |
| 1338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | inet6_destroy_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | } |
| 1341 | |
| 1342 | /* |
| 1343 | * Socket option code for UDP |
| 1344 | */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1345 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1346 | char __user *optval, unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1347 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1348 | if (level == SOL_UDP || level == SOL_UDPLITE) |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1349 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 1350 | udp_v6_push_pending_frames); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1351 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1352 | } |
| 1353 | |
| 1354 | #ifdef CONFIG_COMPAT |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1355 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1356 | char __user *optval, unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1357 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1358 | if (level == SOL_UDP || level == SOL_UDPLITE) |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1359 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 1360 | udp_v6_push_pending_frames); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1361 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1362 | } |
| 1363 | #endif |
| 1364 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1365 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
| 1366 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1367 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1368 | if (level == SOL_UDP || level == SOL_UDPLITE) |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1369 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1370 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1371 | } |
| 1372 | |
| 1373 | #ifdef CONFIG_COMPAT |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1374 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
| 1375 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1376 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1377 | if (level == SOL_UDP || level == SOL_UDPLITE) |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1378 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1379 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1380 | } |
| 1381 | #endif |
| 1382 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 1383 | static const struct inet6_protocol udpv6_protocol = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | .handler = udpv6_rcv, |
| 1385 | .err_handler = udpv6_err, |
| 1386 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| 1387 | }; |
| 1388 | |
| 1389 | /* ------------------------------------------------------------------------ */ |
| 1390 | #ifdef CONFIG_PROC_FS |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1391 | int udp6_seq_show(struct seq_file *seq, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | { |
Lorenzo Colitti | 17ef66af | 2013-05-31 15:05:48 +0000 | [diff] [blame] | 1393 | if (v == SEQ_START_TOKEN) { |
| 1394 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); |
| 1395 | } else { |
| 1396 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; |
| 1397 | struct inet_sock *inet = inet_sk(v); |
| 1398 | __u16 srcp = ntohs(inet->inet_sport); |
| 1399 | __u16 destp = ntohs(inet->inet_dport); |
| 1400 | ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); |
| 1401 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | return 0; |
| 1403 | } |
| 1404 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 1405 | static const struct file_operations udp6_afinfo_seq_fops = { |
| 1406 | .owner = THIS_MODULE, |
| 1407 | .open = udp_seq_open, |
| 1408 | .read = seq_read, |
| 1409 | .llseek = seq_lseek, |
| 1410 | .release = seq_release_net |
| 1411 | }; |
| 1412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | .name = "udp6", |
| 1415 | .family = AF_INET6, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1416 | .udp_table = &udp_table, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 1417 | .seq_fops = &udp6_afinfo_seq_fops, |
Denis V. Lunev | dda6192 | 2008-03-28 18:24:26 -0700 | [diff] [blame] | 1418 | .seq_ops = { |
| 1419 | .show = udp6_seq_show, |
| 1420 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | }; |
| 1422 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1423 | int __net_init udp6_proc_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | { |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 1425 | return udp_proc_register(net, &udp6_seq_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | } |
| 1427 | |
Ian Morris | ec120da | 2015-08-14 22:43:38 +0100 | [diff] [blame] | 1428 | void udp6_proc_exit(struct net *net) |
| 1429 | { |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 1430 | udp_proc_unregister(net, &udp6_seq_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | } |
| 1432 | #endif /* CONFIG_PROC_FS */ |
| 1433 | |
| 1434 | /* ------------------------------------------------------------------------ */ |
| 1435 | |
| 1436 | struct proto udpv6_prot = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1437 | .name = "UDPv6", |
| 1438 | .owner = THIS_MODULE, |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1439 | .close = udp_lib_close, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1440 | .connect = ip6_datagram_connect, |
| 1441 | .disconnect = udp_disconnect, |
| 1442 | .ioctl = udp_ioctl, |
| 1443 | .destroy = udpv6_destroy_sock, |
| 1444 | .setsockopt = udpv6_setsockopt, |
| 1445 | .getsockopt = udpv6_getsockopt, |
| 1446 | .sendmsg = udpv6_sendmsg, |
| 1447 | .recvmsg = udpv6_recvmsg, |
Benjamin LaHaise | f7ad74f | 2012-04-27 08:23:21 +0000 | [diff] [blame] | 1448 | .backlog_rcv = __udpv6_queue_rcv_skb, |
Martin KaFai Lau | e646b65 | 2016-04-11 15:29:37 -0700 | [diff] [blame] | 1449 | .release_cb = ip6_datagram_release_cb, |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1450 | .hash = udp_lib_hash, |
| 1451 | .unhash = udp_lib_unhash, |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1452 | .rehash = udp_v6_rehash, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1453 | .get_port = udp_v6_get_port, |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 1454 | .memory_allocated = &udp_memory_allocated, |
| 1455 | .sysctl_mem = sysctl_udp_mem, |
| 1456 | .sysctl_wmem = &sysctl_udp_wmem_min, |
| 1457 | .sysctl_rmem = &sysctl_udp_rmem_min, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1458 | .obj_size = sizeof(struct udp6_sock), |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1459 | .h.udp_table = &udp_table, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1460 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1461 | .compat_setsockopt = compat_udpv6_setsockopt, |
| 1462 | .compat_getsockopt = compat_udpv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1463 | #endif |
David Ahern | 5d77dca | 2016-08-23 21:06:33 -0700 | [diff] [blame] | 1464 | .diag_destroy = udp_abort, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | }; |
| 1466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | static struct inet_protosw udpv6_protosw = { |
| 1468 | .type = SOCK_DGRAM, |
| 1469 | .protocol = IPPROTO_UDP, |
| 1470 | .prot = &udpv6_prot, |
| 1471 | .ops = &inet6_dgram_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | .flags = INET_PROTOSW_PERMANENT, |
| 1473 | }; |
| 1474 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1475 | int __init udpv6_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | { |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1477 | int ret; |
| 1478 | |
Vlad Yasevich | 3336288 | 2012-11-15 08:49:15 +0000 | [diff] [blame] | 1479 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
| 1480 | if (ret) |
Vlad Yasevich | c6b641a | 2012-11-15 08:49:22 +0000 | [diff] [blame] | 1481 | goto out; |
Vlad Yasevich | 3336288 | 2012-11-15 08:49:15 +0000 | [diff] [blame] | 1482 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1483 | ret = inet6_register_protosw(&udpv6_protosw); |
| 1484 | if (ret) |
| 1485 | goto out_udpv6_protocol; |
| 1486 | out: |
| 1487 | return ret; |
| 1488 | |
| 1489 | out_udpv6_protocol: |
| 1490 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); |
| 1491 | goto out; |
| 1492 | } |
| 1493 | |
Daniel Lezcano | 09f7709 | 2007-12-13 05:34:58 -0800 | [diff] [blame] | 1494 | void udpv6_exit(void) |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1495 | { |
| 1496 | inet6_unregister_protosw(&udpv6_protosw); |
| 1497 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | } |