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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <asm/uaccess.h> |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <net/ndisc.h> |
| 40 | #include <net/protocol.h> |
| 41 | #include <net/transp_v6.h> |
| 42 | #include <net/ip6_route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <net/raw.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 44 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <net/ip6_checksum.h> |
| 46 | #include <net/xfrm.h> |
| 47 | |
| 48 | #include <linux/proc_fs.h> |
| 49 | #include <linux/seq_file.h> |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 50 | #include "udp_impl.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Vlad Yasevich | b2f5e7c | 2009-03-24 16:24:51 +0000 | [diff] [blame] | 52 | int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) |
| 53 | { |
| 54 | const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; |
| 55 | const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 56 | __be32 sk1_rcv_saddr = inet_sk(sk)->inet_rcv_saddr; |
Vlad Yasevich | 499923c | 2009-04-09 17:37:33 +0000 | [diff] [blame] | 57 | __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); |
Vlad Yasevich | b2f5e7c | 2009-03-24 16:24:51 +0000 | [diff] [blame] | 58 | int sk_ipv6only = ipv6_only_sock(sk); |
| 59 | int sk2_ipv6only = inet_v6_ipv6only(sk2); |
| 60 | int addr_type = ipv6_addr_type(sk_rcv_saddr6); |
| 61 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; |
| 62 | |
| 63 | /* if both are mapped, treat as IPv4 */ |
| 64 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) |
Vlad Yasevich | 499923c | 2009-04-09 17:37:33 +0000 | [diff] [blame] | 65 | return (!sk2_ipv6only && |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 66 | (!sk1_rcv_saddr || !sk2_rcv_saddr || |
| 67 | sk1_rcv_saddr == sk2_rcv_saddr)); |
Vlad Yasevich | b2f5e7c | 2009-03-24 16:24:51 +0000 | [diff] [blame] | 68 | |
| 69 | if (addr_type2 == IPV6_ADDR_ANY && |
| 70 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) |
| 71 | return 1; |
| 72 | |
| 73 | if (addr_type == IPV6_ADDR_ANY && |
| 74 | !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) |
| 75 | return 1; |
| 76 | |
| 77 | if (sk2_rcv_saddr6 && |
| 78 | ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) |
| 79 | return 1; |
| 80 | |
| 81 | return 0; |
| 82 | } |
| 83 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 84 | static unsigned int udp6_portaddr_hash(struct net *net, |
| 85 | const struct in6_addr *addr6, |
| 86 | unsigned int port) |
| 87 | { |
| 88 | unsigned int hash, mix = net_hash_mix(net); |
| 89 | |
| 90 | if (ipv6_addr_any(addr6)) |
| 91 | hash = jhash_1word(0, mix); |
Brian Haley | 856540e | 2009-11-09 12:05:53 +0000 | [diff] [blame] | 92 | else if (ipv6_addr_v4mapped(addr6)) |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 93 | hash = jhash_1word(addr6->s6_addr32[3], mix); |
| 94 | else |
| 95 | hash = jhash2(addr6->s6_addr32, 4, mix); |
| 96 | |
| 97 | return hash ^ port; |
| 98 | } |
| 99 | |
| 100 | |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 101 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 103 | unsigned int hash2_nulladdr = |
| 104 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); |
| 105 | unsigned int hash2_partial = |
| 106 | udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0); |
| 107 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 108 | /* precompute partial secondary hash */ |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 109 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
| 110 | 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] | 111 | } |
| 112 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 113 | static inline int compute_score(struct sock *sk, struct net *net, |
| 114 | unsigned short hnum, |
| 115 | struct in6_addr *saddr, __be16 sport, |
| 116 | struct in6_addr *daddr, __be16 dport, |
| 117 | int dif) |
| 118 | { |
| 119 | int score = -1; |
| 120 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 121 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 122 | sk->sk_family == PF_INET6) { |
| 123 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 124 | struct inet_sock *inet = inet_sk(sk); |
| 125 | |
| 126 | score = 0; |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 127 | if (inet->inet_dport) { |
| 128 | if (inet->inet_dport != sport) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 129 | return -1; |
| 130 | score++; |
| 131 | } |
| 132 | if (!ipv6_addr_any(&np->rcv_saddr)) { |
| 133 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) |
| 134 | return -1; |
| 135 | score++; |
| 136 | } |
| 137 | if (!ipv6_addr_any(&np->daddr)) { |
| 138 | if (!ipv6_addr_equal(&np->daddr, saddr)) |
| 139 | return -1; |
| 140 | score++; |
| 141 | } |
| 142 | if (sk->sk_bound_dev_if) { |
| 143 | if (sk->sk_bound_dev_if != dif) |
| 144 | return -1; |
| 145 | score++; |
| 146 | } |
| 147 | } |
| 148 | return score; |
| 149 | } |
| 150 | |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 151 | #define SCORE2_MAX (1 + 1 + 1) |
| 152 | static inline int compute_score2(struct sock *sk, struct net *net, |
| 153 | const struct in6_addr *saddr, __be16 sport, |
| 154 | const struct in6_addr *daddr, unsigned short hnum, |
| 155 | int dif) |
| 156 | { |
| 157 | int score = -1; |
| 158 | |
| 159 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
| 160 | sk->sk_family == PF_INET6) { |
| 161 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 162 | struct inet_sock *inet = inet_sk(sk); |
| 163 | |
| 164 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) |
| 165 | return -1; |
| 166 | score = 0; |
| 167 | if (inet->inet_dport) { |
| 168 | if (inet->inet_dport != sport) |
| 169 | return -1; |
| 170 | score++; |
| 171 | } |
| 172 | if (!ipv6_addr_any(&np->daddr)) { |
| 173 | if (!ipv6_addr_equal(&np->daddr, saddr)) |
| 174 | return -1; |
| 175 | score++; |
| 176 | } |
| 177 | if (sk->sk_bound_dev_if) { |
| 178 | if (sk->sk_bound_dev_if != dif) |
| 179 | return -1; |
| 180 | score++; |
| 181 | } |
| 182 | } |
| 183 | return score; |
| 184 | } |
| 185 | |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 186 | |
| 187 | /* called with read_rcu_lock() */ |
| 188 | static struct sock *udp6_lib_lookup2(struct net *net, |
| 189 | const struct in6_addr *saddr, __be16 sport, |
| 190 | const struct in6_addr *daddr, unsigned int hnum, int dif, |
| 191 | struct udp_hslot *hslot2, unsigned int slot2) |
| 192 | { |
| 193 | struct sock *sk, *result; |
| 194 | struct hlist_nulls_node *node; |
| 195 | int score, badness; |
| 196 | |
| 197 | begin: |
| 198 | result = NULL; |
| 199 | badness = -1; |
| 200 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { |
| 201 | score = compute_score2(sk, net, saddr, sport, |
| 202 | daddr, hnum, dif); |
| 203 | if (score > badness) { |
| 204 | result = sk; |
| 205 | badness = score; |
| 206 | if (score == SCORE2_MAX) |
| 207 | goto exact_match; |
| 208 | } |
| 209 | } |
| 210 | /* |
| 211 | * if the nulls value we got at the end of this lookup is |
| 212 | * not the expected one, we must restart lookup. |
| 213 | * We probably met an item that was moved to another chain. |
| 214 | */ |
| 215 | if (get_nulls_value(node) != slot2) |
| 216 | goto begin; |
| 217 | |
| 218 | if (result) { |
| 219 | exact_match: |
| 220 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) |
| 221 | result = NULL; |
| 222 | else if (unlikely(compute_score2(result, net, saddr, sport, |
| 223 | daddr, hnum, dif) < badness)) { |
| 224 | sock_put(result); |
| 225 | goto begin; |
| 226 | } |
| 227 | } |
| 228 | return result; |
| 229 | } |
| 230 | |
Pavel Emelyanov | fa4d3c6 | 2008-01-31 05:07:57 -0800 | [diff] [blame] | 231 | static struct sock *__udp6_lib_lookup(struct net *net, |
| 232 | struct in6_addr *saddr, __be16 sport, |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 233 | struct in6_addr *daddr, __be16 dport, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 234 | int dif, struct udp_table *udptable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | { |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 236 | struct sock *sk, *result; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 237 | struct hlist_nulls_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | unsigned short hnum = ntohs(dport); |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 239 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
| 240 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 241 | int score, badness; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 243 | rcu_read_lock(); |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 244 | if (hslot->count > 10) { |
| 245 | hash2 = udp6_portaddr_hash(net, daddr, hnum); |
| 246 | slot2 = hash2 & udptable->mask; |
| 247 | hslot2 = &udptable->hash2[slot2]; |
| 248 | if (hslot->count < hslot2->count) |
| 249 | goto begin; |
| 250 | |
| 251 | result = udp6_lib_lookup2(net, saddr, sport, |
| 252 | daddr, hnum, dif, |
| 253 | hslot2, slot2); |
| 254 | if (!result) { |
| 255 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); |
| 256 | slot2 = hash2 & udptable->mask; |
| 257 | hslot2 = &udptable->hash2[slot2]; |
| 258 | if (hslot->count < hslot2->count) |
| 259 | goto begin; |
| 260 | |
| 261 | result = udp6_lib_lookup2(net, &in6addr_any, sport, |
| 262 | daddr, hnum, dif, |
| 263 | hslot2, slot2); |
| 264 | } |
| 265 | rcu_read_unlock(); |
| 266 | return result; |
| 267 | } |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 268 | begin: |
| 269 | result = NULL; |
| 270 | badness = -1; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 271 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 272 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
| 273 | if (score > badness) { |
| 274 | result = sk; |
| 275 | badness = score; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | } |
| 277 | } |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 278 | /* |
| 279 | * if the nulls value we got at the end of this lookup is |
| 280 | * not the expected one, we must restart lookup. |
| 281 | * We probably met an item that was moved to another chain. |
| 282 | */ |
Eric Dumazet | fddc17d | 2009-11-08 10:18:30 +0000 | [diff] [blame] | 283 | if (get_nulls_value(node) != slot) |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 284 | goto begin; |
| 285 | |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 286 | if (result) { |
| 287 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) |
| 288 | result = NULL; |
| 289 | else if (unlikely(compute_score(result, net, hnum, saddr, sport, |
| 290 | daddr, dport, dif) < badness)) { |
| 291 | sock_put(result); |
| 292 | goto begin; |
| 293 | } |
| 294 | } |
| 295 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | return result; |
| 297 | } |
| 298 | |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 299 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
| 300 | __be16 sport, __be16 dport, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 301 | struct udp_table *udptable) |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 302 | { |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 303 | struct sock *sk; |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 304 | struct ipv6hdr *iph = ipv6_hdr(skb); |
| 305 | |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 306 | if (unlikely(sk = skb_steal_sock(skb))) |
| 307 | return sk; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 308 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
| 309 | &iph->daddr, dport, inet6_iif(skb), |
| 310 | udptable); |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 311 | } |
| 312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | * This should be easy, if there is something there we |
| 315 | * return it, otherwise we block. |
| 316 | */ |
| 317 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 318 | int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | struct msghdr *msg, size_t len, |
| 320 | int noblock, int flags, int *addr_len) |
| 321 | { |
| 322 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 323 | struct inet_sock *inet = inet_sk(sk); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 324 | struct sk_buff *skb; |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 325 | unsigned int ulen, copied; |
Herbert Xu | a59322b | 2007-12-05 01:53:40 -0800 | [diff] [blame] | 326 | int peeked; |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 327 | int err; |
| 328 | int is_udplite = IS_UDPLITE(sk); |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 329 | int is_udp4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 331 | if (addr_len) |
| 332 | *addr_len=sizeof(struct sockaddr_in6); |
| 333 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | if (flags & MSG_ERRQUEUE) |
| 335 | return ipv6_recv_error(sk, msg, len); |
| 336 | |
| 337 | try_again: |
Herbert Xu | a59322b | 2007-12-05 01:53:40 -0800 | [diff] [blame] | 338 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
| 339 | &peeked, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | if (!skb) |
| 341 | goto out; |
| 342 | |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 343 | ulen = skb->len - sizeof(struct udphdr); |
| 344 | copied = len; |
| 345 | if (copied > ulen) |
| 346 | copied = ulen; |
| 347 | else if (copied < ulen) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 348 | msg->msg_flags |= MSG_TRUNC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 350 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
| 351 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 352 | /* |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 353 | * If checksum is needed at all, try to do it while copying the |
| 354 | * data. If the data is truncated, or if we only want a partial |
| 355 | * coverage checksum (UDP-Lite), do it before the copy. |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 356 | */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 357 | |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 358 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
| 359 | if (udp_lib_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | goto csum_copy_err; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 361 | } |
| 362 | |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 363 | if (skb_csum_unnecessary(skb)) |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 364 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
| 365 | msg->msg_iov, copied ); |
| 366 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); |
| 368 | if (err == -EINVAL) |
| 369 | goto csum_copy_err; |
| 370 | } |
| 371 | if (err) |
| 372 | goto out_free; |
| 373 | |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 374 | if (!peeked) { |
| 375 | if (is_udp4) |
| 376 | UDP_INC_STATS_USER(sock_net(sk), |
| 377 | UDP_MIB_INDATAGRAMS, is_udplite); |
| 378 | else |
| 379 | UDP6_INC_STATS_USER(sock_net(sk), |
| 380 | UDP_MIB_INDATAGRAMS, is_udplite); |
| 381 | } |
Wang Chen | cb75994 | 2007-12-03 22:33:28 +1100 | [diff] [blame] | 382 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 383 | sock_recv_ts_and_drops(msg, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | /* Copy the address. */ |
| 386 | if (msg->msg_name) { |
| 387 | struct sockaddr_in6 *sin6; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | sin6 = (struct sockaddr_in6 *) msg->msg_name; |
| 390 | sin6->sin6_family = AF_INET6; |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 391 | sin6->sin6_port = udp_hdr(skb)->source; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | sin6->sin6_flowinfo = 0; |
| 393 | sin6->sin6_scope_id = 0; |
| 394 | |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 395 | if (is_udp4) |
Brian Haley | b301e82 | 2009-10-07 13:58:25 -0700 | [diff] [blame] | 396 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
| 397 | &sin6->sin6_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | else { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 399 | ipv6_addr_copy(&sin6->sin6_addr, |
| 400 | &ipv6_hdr(skb)->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| 402 | sin6->sin6_scope_id = IP6CB(skb)->iif; |
| 403 | } |
| 404 | |
| 405 | } |
Wei Yongjun | f26ba17 | 2008-11-02 16:11:01 +0000 | [diff] [blame] | 406 | if (is_udp4) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | if (inet->cmsg_flags) |
| 408 | ip_cmsg_recv(msg, skb); |
| 409 | } else { |
| 410 | if (np->rxopt.all) |
| 411 | datagram_recv_ctl(sk, msg, skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 412 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
| 414 | err = copied; |
| 415 | if (flags & MSG_TRUNC) |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 416 | err = ulen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
| 418 | out_free: |
Eric Dumazet | 9d410c7 | 2009-10-30 05:03:53 +0000 | [diff] [blame] | 419 | skb_free_datagram_locked(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | out: |
| 421 | return err; |
| 422 | |
| 423 | csum_copy_err: |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 424 | lock_sock(sk); |
Wei Yongjun | 0856f93 | 2008-11-02 16:14:27 +0000 | [diff] [blame] | 425 | if (!skb_kill_datagram(sk, skb, flags)) { |
| 426 | if (is_udp4) |
| 427 | UDP_INC_STATS_USER(sock_net(sk), |
| 428 | UDP_MIB_INERRORS, is_udplite); |
| 429 | else |
| 430 | UDP6_INC_STATS_USER(sock_net(sk), |
| 431 | UDP_MIB_INERRORS, is_udplite); |
| 432 | } |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 433 | release_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
Mitsuru Chinen | 7a0ff716 | 2007-11-05 21:29:17 -0800 | [diff] [blame] | 435 | if (flags & MSG_DONTWAIT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | return -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | goto try_again; |
| 438 | } |
| 439 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 440 | 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] | 441 | u8 type, u8 code, int offset, __be32 info, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 442 | struct udp_table *udptable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | { |
| 444 | struct ipv6_pinfo *np; |
| 445 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | struct in6_addr *saddr = &hdr->saddr; |
| 447 | struct in6_addr *daddr = &hdr->daddr; |
| 448 | struct udphdr *uh = (struct udphdr*)(skb->data+offset); |
| 449 | struct sock *sk; |
| 450 | int err; |
| 451 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 452 | sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 453 | saddr, uh->source, inet6_iif(skb), udptable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | if (sk == NULL) |
| 455 | return; |
| 456 | |
| 457 | np = inet6_sk(sk); |
| 458 | |
| 459 | if (!icmpv6_err_convert(type, code, &err) && !np->recverr) |
| 460 | goto out; |
| 461 | |
| 462 | if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) |
| 463 | goto out; |
| 464 | |
| 465 | if (np->recverr) |
| 466 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
| 467 | |
| 468 | sk->sk_err = err; |
| 469 | sk->sk_error_report(sk); |
| 470 | out: |
| 471 | sock_put(sk); |
| 472 | } |
| 473 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 474 | static __inline__ void udpv6_err(struct sk_buff *skb, |
Brian Haley | d5fdd6b | 2009-06-23 04:31:07 -0700 | [diff] [blame] | 475 | struct inet6_skb_parm *opt, u8 type, |
| 476 | u8 code, int offset, __be32 info ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 478 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 479 | } |
| 480 | |
| 481 | int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) |
| 482 | { |
| 483 | struct udp_sock *up = udp_sk(sk); |
David S. Miller | a18135e | 2006-08-15 00:00:09 -0700 | [diff] [blame] | 484 | int rc; |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 485 | int is_udplite = IS_UDPLITE(sk); |
David S. Miller | a18135e | 2006-08-15 00:00:09 -0700 | [diff] [blame] | 486 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 487 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 488 | goto drop; |
| 489 | |
| 490 | /* |
| 491 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). |
| 492 | */ |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 493 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 494 | |
| 495 | if (up->pcrlen == 0) { /* full coverage was set */ |
| 496 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" |
| 497 | " %d while full coverage %d requested\n", |
| 498 | UDP_SKB_CB(skb)->cscov, skb->len); |
| 499 | goto drop; |
| 500 | } |
| 501 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { |
| 502 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " |
| 503 | "too small, need min %d\n", |
| 504 | UDP_SKB_CB(skb)->cscov, up->pcrlen); |
| 505 | goto drop; |
| 506 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
Herbert Xu | 1ab6eb6 | 2007-03-06 20:29:58 -0800 | [diff] [blame] | 509 | if (sk->sk_filter) { |
| 510 | if (udp_lib_checksum_complete(skb)) |
| 511 | goto drop; |
| 512 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 514 | if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) { |
David S. Miller | a18135e | 2006-08-15 00:00:09 -0700 | [diff] [blame] | 515 | /* Note that an ENOMEM error is charged twice */ |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 516 | if (rc == -ENOMEM) |
Pavel Emelyanov | ef28d1a | 2008-07-05 21:19:40 -0700 | [diff] [blame] | 517 | UDP6_INC_STATS_BH(sock_net(sk), |
| 518 | UDP_MIB_RCVBUFERRORS, is_udplite); |
Eric Dumazet | 8edf19c | 2009-10-15 00:12:40 +0000 | [diff] [blame] | 519 | goto drop_no_sk_drops_inc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | } |
Wang Chen | cb75994 | 2007-12-03 22:33:28 +1100 | [diff] [blame] | 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | return 0; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 523 | drop: |
Eric Dumazet | 8edf19c | 2009-10-15 00:12:40 +0000 | [diff] [blame] | 524 | atomic_inc(&sk->sk_drops); |
| 525 | drop_no_sk_drops_inc: |
Pavel Emelyanov | ef28d1a | 2008-07-05 21:19:40 -0700 | [diff] [blame] | 526 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 527 | kfree_skb(skb); |
| 528 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | } |
| 530 | |
Eric Dumazet | 920a461 | 2008-11-01 21:22:23 -0700 | [diff] [blame] | 531 | static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, |
Al Viro | e69a4ad | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 532 | __be16 loc_port, struct in6_addr *loc_addr, |
| 533 | __be16 rmt_port, struct in6_addr *rmt_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | int dif) |
| 535 | { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 536 | struct hlist_nulls_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | struct sock *s = sk; |
| 538 | unsigned short num = ntohs(loc_port); |
| 539 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 540 | sk_nulls_for_each_from(s, node) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | struct inet_sock *inet = inet_sk(s); |
| 542 | |
Eric Dumazet | 920a461 | 2008-11-01 21:22:23 -0700 | [diff] [blame] | 543 | if (!net_eq(sock_net(s), net)) |
Daniel Lezcano | b8ad0cb | 2008-03-07 11:16:55 -0800 | [diff] [blame] | 544 | continue; |
| 545 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 546 | if (udp_sk(s)->udp_port_hash == num && |
| 547 | s->sk_family == PF_INET6) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | struct ipv6_pinfo *np = inet6_sk(s); |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 549 | if (inet->inet_dport) { |
| 550 | if (inet->inet_dport != rmt_port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | continue; |
| 552 | } |
| 553 | if (!ipv6_addr_any(&np->daddr) && |
| 554 | !ipv6_addr_equal(&np->daddr, rmt_addr)) |
| 555 | continue; |
| 556 | |
| 557 | if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) |
| 558 | continue; |
| 559 | |
| 560 | if (!ipv6_addr_any(&np->rcv_saddr)) { |
David L Stevens | 40796c5 | 2005-09-14 21:10:20 -0700 | [diff] [blame] | 561 | if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) |
| 562 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
Stephen Hemminger | add459a | 2007-03-08 20:42:35 -0800 | [diff] [blame] | 564 | if (!inet6_mc_check(s, loc_addr, rmt_addr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | continue; |
| 566 | return s; |
| 567 | } |
| 568 | } |
| 569 | return NULL; |
| 570 | } |
| 571 | |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 572 | static void flush_stack(struct sock **stack, unsigned int count, |
| 573 | struct sk_buff *skb, unsigned int final) |
| 574 | { |
| 575 | unsigned int i; |
| 576 | struct sock *sk; |
| 577 | struct sk_buff *skb1; |
| 578 | |
| 579 | for (i = 0; i < count; i++) { |
| 580 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); |
| 581 | |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 582 | sk = stack[i]; |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 583 | if (skb1) { |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 584 | bh_lock_sock(sk); |
| 585 | if (!sock_owned_by_user(sk)) |
| 586 | udpv6_queue_rcv_skb(sk, skb1); |
| 587 | else |
| 588 | sk_add_backlog(sk, skb1); |
| 589 | bh_unlock_sock(sk); |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 590 | } else { |
| 591 | atomic_inc(&sk->sk_drops); |
| 592 | UDP6_INC_STATS_BH(sock_net(sk), |
| 593 | UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk)); |
| 594 | UDP6_INC_STATS_BH(sock_net(sk), |
| 595 | UDP_MIB_INERRORS, IS_UDPLITE(sk)); |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 596 | } |
| 597 | } |
| 598 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | /* |
| 600 | * Note: called only from the BH handler context, |
| 601 | * so we don't need to lock the hashes. |
| 602 | */ |
Pavel Emelyanov | e316349 | 2008-06-16 17:12:11 -0700 | [diff] [blame] | 603 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
| 604 | struct in6_addr *saddr, struct in6_addr *daddr, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 605 | struct udp_table *udptable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | { |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 607 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 608 | const struct udphdr *uh = udp_hdr(skb); |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 609 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | int dif; |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 611 | unsigned int i, count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 613 | spin_lock(&hslot->lock); |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 614 | sk = sk_nulls_head(&hslot->head); |
YOSHIFUJI Hideaki | f2776ff | 2006-11-21 17:41:56 -0800 | [diff] [blame] | 615 | dif = inet6_iif(skb); |
Eric Dumazet | 920a461 | 2008-11-01 21:22:23 -0700 | [diff] [blame] | 616 | sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 617 | while (sk) { |
| 618 | stack[count++] = sk; |
| 619 | sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, |
| 620 | uh->source, saddr, dif); |
| 621 | if (unlikely(count == ARRAY_SIZE(stack))) { |
| 622 | if (!sk) |
| 623 | break; |
| 624 | flush_stack(stack, count, skb, ~0); |
| 625 | count = 0; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 626 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 628 | /* |
| 629 | * before releasing the lock, we must take reference on sockets |
| 630 | */ |
| 631 | for (i = 0; i < count; i++) |
| 632 | sock_hold(stack[i]); |
| 633 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 634 | spin_unlock(&hslot->lock); |
Eric Dumazet | a1ab77f | 2009-11-08 10:18:52 +0000 | [diff] [blame] | 635 | |
| 636 | if (count) { |
| 637 | flush_stack(stack, count, skb, count - 1); |
| 638 | |
| 639 | for (i = 0; i < count; i++) |
| 640 | sock_put(stack[i]); |
| 641 | } else { |
| 642 | kfree_skb(skb); |
| 643 | } |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 644 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | } |
| 646 | |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 647 | static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, |
| 648 | int proto) |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 649 | { |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 650 | int err; |
| 651 | |
| 652 | UDP_SKB_CB(skb)->partial_cov = 0; |
| 653 | UDP_SKB_CB(skb)->cscov = skb->len; |
| 654 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 655 | if (proto == IPPROTO_UDPLITE) { |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 656 | err = udplite_checksum_init(skb, uh); |
| 657 | if (err) |
| 658 | return err; |
| 659 | } |
| 660 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 661 | if (uh->check == 0) { |
| 662 | /* RFC 2460 section 8.1 says that we SHOULD log |
| 663 | this error. Well, it is reasonable. |
| 664 | */ |
| 665 | LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); |
| 666 | return 1; |
| 667 | } |
| 668 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 669 | !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 670 | skb->len, proto, skb->csum)) |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 671 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 672 | |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 673 | if (!skb_csum_unnecessary(skb)) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 674 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
| 675 | &ipv6_hdr(skb)->daddr, |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 676 | skb->len, proto, 0)); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 677 | |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 678 | return 0; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 679 | } |
| 680 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 681 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 682 | int proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | struct sock *sk; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 685 | struct udphdr *uh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | struct net_device *dev = skb->dev; |
| 687 | struct in6_addr *saddr, *daddr; |
| 688 | u32 ulen = 0; |
Pavel Emelyanov | ef28d1a | 2008-07-05 21:19:40 -0700 | [diff] [blame] | 689 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
| 691 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
| 692 | goto short_packet; |
| 693 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 694 | saddr = &ipv6_hdr(skb)->saddr; |
| 695 | daddr = &ipv6_hdr(skb)->daddr; |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 696 | uh = udp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
| 698 | ulen = ntohs(uh->len); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 699 | if (ulen > skb->len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | goto short_packet; |
| 701 | |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 702 | if (proto == IPPROTO_UDP) { |
| 703 | /* UDP validates ulen. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 705 | /* Check for jumbo payload */ |
| 706 | if (ulen == 0) |
| 707 | ulen = skb->len; |
| 708 | |
| 709 | if (ulen < sizeof(*uh)) |
| 710 | goto short_packet; |
| 711 | |
| 712 | if (ulen < skb->len) { |
| 713 | if (pskb_trim_rcsum(skb, ulen)) |
| 714 | goto short_packet; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 715 | saddr = &ipv6_hdr(skb)->saddr; |
| 716 | daddr = &ipv6_hdr(skb)->daddr; |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 717 | uh = udp_hdr(skb); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 718 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | } |
| 720 | |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 721 | if (udp6_csum_init(skb, uh, proto)) |
| 722 | goto discard; |
| 723 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 724 | /* |
| 725 | * Multicast receive code |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 727 | if (ipv6_addr_is_multicast(daddr)) |
Pavel Emelyanov | e316349 | 2008-06-16 17:12:11 -0700 | [diff] [blame] | 728 | return __udp6_lib_mcast_deliver(net, skb, |
| 729 | saddr, daddr, udptable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
| 731 | /* Unicast */ |
| 732 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 733 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | * check socket cache ... must talk to Alan about his plans |
| 735 | * for sock caches... i'll skip this for now. |
| 736 | */ |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 737 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
| 739 | if (sk == NULL) { |
| 740 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 741 | goto discard; |
| 742 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 743 | if (udp_lib_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | goto discard; |
Pavel Emelyanov | ef28d1a | 2008-07-05 21:19:40 -0700 | [diff] [blame] | 745 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, |
| 746 | proto == IPPROTO_UDPLITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
| 748 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); |
| 749 | |
| 750 | kfree_skb(skb); |
Stephen Hemminger | add459a | 2007-03-08 20:42:35 -0800 | [diff] [blame] | 751 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | /* deliver */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 755 | |
Herbert Xu | d97106e | 2008-08-09 00:35:05 -0700 | [diff] [blame] | 756 | bh_lock_sock(sk); |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 757 | if (!sock_owned_by_user(sk)) |
| 758 | udpv6_queue_rcv_skb(sk, skb); |
| 759 | else |
| 760 | sk_add_backlog(sk, skb); |
| 761 | bh_unlock_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | sock_put(sk); |
Stephen Hemminger | add459a | 2007-03-08 20:42:35 -0800 | [diff] [blame] | 763 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 765 | short_packet: |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 766 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 767 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
Herbert Xu | 759e5d0 | 2007-03-25 20:10:56 -0700 | [diff] [blame] | 768 | ulen, skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
| 770 | discard: |
Pavel Emelyanov | ef28d1a | 2008-07-05 21:19:40 -0700 | [diff] [blame] | 771 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | kfree_skb(skb); |
Stephen Hemminger | add459a | 2007-03-08 20:42:35 -0800 | [diff] [blame] | 773 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | } |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 775 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 776 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 777 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 778 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 779 | } |
| 780 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | /* |
| 782 | * Throw away all pending data and cancel the corking. Socket is locked. |
| 783 | */ |
| 784 | static void udp_v6_flush_pending_frames(struct sock *sk) |
| 785 | { |
| 786 | struct udp_sock *up = udp_sk(sk); |
| 787 | |
Denis V. Lunev | 36d926b | 2008-06-04 15:49:07 +0400 | [diff] [blame] | 788 | if (up->pending == AF_INET) |
| 789 | udp_flush_pending_frames(sk); |
| 790 | else if (up->pending) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | up->len = 0; |
| 792 | up->pending = 0; |
| 793 | ip6_flush_pending_frames(sk); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 794 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | } |
| 796 | |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 797 | /** |
| 798 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
| 799 | * @sk: socket we are sending on |
| 800 | * @skb: sk_buff containing the filled-in UDP header |
| 801 | * (checksum field must be zeroed out) |
| 802 | */ |
| 803 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, |
| 804 | const struct in6_addr *saddr, |
| 805 | const struct in6_addr *daddr, int len) |
| 806 | { |
| 807 | unsigned int offset; |
| 808 | struct udphdr *uh = udp_hdr(skb); |
| 809 | __wsum csum = 0; |
| 810 | |
| 811 | if (skb_queue_len(&sk->sk_write_queue) == 1) { |
| 812 | /* Only one fragment on the socket. */ |
| 813 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 814 | skb->csum_offset = offsetof(struct udphdr, check); |
| 815 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); |
| 816 | } else { |
| 817 | /* |
| 818 | * HW-checksum won't work as there are two or more |
| 819 | * fragments on the socket so that all csums of sk_buffs |
| 820 | * should be together |
| 821 | */ |
| 822 | offset = skb_transport_offset(skb); |
| 823 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| 824 | |
| 825 | skb->ip_summed = CHECKSUM_NONE; |
| 826 | |
| 827 | skb_queue_walk(&sk->sk_write_queue, skb) { |
| 828 | csum = csum_add(csum, skb->csum); |
| 829 | } |
| 830 | |
| 831 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, |
| 832 | csum); |
| 833 | if (uh->check == 0) |
| 834 | uh->check = CSUM_MANGLED_0; |
| 835 | } |
| 836 | } |
| 837 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | /* |
| 839 | * Sending |
| 840 | */ |
| 841 | |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 842 | static int udp_v6_push_pending_frames(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | { |
| 844 | struct sk_buff *skb; |
| 845 | struct udphdr *uh; |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 846 | struct udp_sock *up = udp_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | struct inet_sock *inet = inet_sk(sk); |
| 848 | struct flowi *fl = &inet->cork.fl; |
| 849 | int err = 0; |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 850 | int is_udplite = IS_UDPLITE(sk); |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 851 | __wsum csum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
| 853 | /* Grab the skbuff where UDP header space exists. */ |
| 854 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) |
| 855 | goto out; |
| 856 | |
| 857 | /* |
| 858 | * Create a UDP header |
| 859 | */ |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 860 | uh = udp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | uh->source = fl->fl_ip_sport; |
| 862 | uh->dest = fl->fl_ip_dport; |
| 863 | uh->len = htons(up->len); |
| 864 | uh->check = 0; |
| 865 | |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 866 | if (is_udplite) |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 867 | csum = udplite_csum_outgoing(sk, skb); |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 868 | else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
| 869 | udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst, |
| 870 | up->len); |
| 871 | goto send; |
| 872 | } else |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 873 | csum = udp_csum_outgoing(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 875 | /* add protocol-dependent pseudo-header */ |
| 876 | uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, |
| 877 | up->len, fl->proto, csum ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | if (uh->check == 0) |
Al Viro | f6ab028 | 2006-11-16 02:36:50 -0800 | [diff] [blame] | 879 | uh->check = CSUM_MANGLED_0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
Sridhar Samudrala | 493c6be | 2009-07-09 08:09:54 +0000 | [diff] [blame] | 881 | send: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | err = ip6_push_pending_frames(sk); |
Eric Dumazet | 6ce9e7b | 2009-09-02 18:05:33 -0700 | [diff] [blame] | 883 | if (err) { |
| 884 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { |
| 885 | UDP6_INC_STATS_USER(sock_net(sk), |
| 886 | UDP_MIB_SNDBUFERRORS, is_udplite); |
| 887 | err = 0; |
| 888 | } |
| 889 | } else |
| 890 | UDP6_INC_STATS_USER(sock_net(sk), |
| 891 | UDP_MIB_OUTDATAGRAMS, is_udplite); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | out: |
| 893 | up->len = 0; |
| 894 | up->pending = 0; |
| 895 | return err; |
| 896 | } |
| 897 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 898 | int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | struct msghdr *msg, size_t len) |
| 900 | { |
| 901 | struct ipv6_txoptions opt_space; |
| 902 | struct udp_sock *up = udp_sk(sk); |
| 903 | struct inet_sock *inet = inet_sk(sk); |
| 904 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 905 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; |
| 906 | struct in6_addr *daddr, *final_p = NULL, final; |
| 907 | struct ipv6_txoptions *opt = NULL; |
| 908 | struct ip6_flowlabel *flowlabel = NULL; |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 909 | struct flowi fl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | struct dst_entry *dst; |
| 911 | int addr_len = msg->msg_namelen; |
| 912 | int ulen = len; |
| 913 | int hlimit = -1; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 914 | int tclass = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
| 916 | int err; |
Mitsuru KANDA | 987905d | 2005-09-18 00:30:08 -0700 | [diff] [blame] | 917 | int connected = 0; |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 918 | int is_udplite = IS_UDPLITE(sk); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 919 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
| 921 | /* destination address check */ |
| 922 | if (sin6) { |
| 923 | if (addr_len < offsetof(struct sockaddr, sa_data)) |
| 924 | return -EINVAL; |
| 925 | |
| 926 | switch (sin6->sin6_family) { |
| 927 | case AF_INET6: |
| 928 | if (addr_len < SIN6_LEN_RFC2133) |
| 929 | return -EINVAL; |
| 930 | daddr = &sin6->sin6_addr; |
| 931 | break; |
| 932 | case AF_INET: |
| 933 | goto do_udp_sendmsg; |
| 934 | case AF_UNSPEC: |
| 935 | msg->msg_name = sin6 = NULL; |
| 936 | msg->msg_namelen = addr_len = 0; |
| 937 | daddr = NULL; |
| 938 | break; |
| 939 | default: |
| 940 | return -EINVAL; |
| 941 | } |
| 942 | } else if (!up->pending) { |
| 943 | if (sk->sk_state != TCP_ESTABLISHED) |
| 944 | return -EDESTADDRREQ; |
| 945 | daddr = &np->daddr; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 946 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | daddr = NULL; |
| 948 | |
| 949 | if (daddr) { |
Brian Haley | e773e4f | 2007-08-24 23:16:08 -0700 | [diff] [blame] | 950 | if (ipv6_addr_v4mapped(daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | struct sockaddr_in sin; |
| 952 | sin.sin_family = AF_INET; |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 953 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
| 955 | msg->msg_name = &sin; |
| 956 | msg->msg_namelen = sizeof(sin); |
| 957 | do_udp_sendmsg: |
| 958 | if (__ipv6_only_sock(sk)) |
| 959 | return -ENETUNREACH; |
| 960 | return udp_sendmsg(iocb, sk, msg, len); |
| 961 | } |
| 962 | } |
| 963 | |
| 964 | if (up->pending == AF_INET) |
| 965 | return udp_sendmsg(iocb, sk, msg, len); |
| 966 | |
| 967 | /* Rough check on arithmetic overflow, |
YOSHIFUJI Hideaki | b59e139 | 2007-03-30 14:45:35 -0700 | [diff] [blame] | 968 | better check is made in ip6_append_data(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | */ |
| 970 | if (len > INT_MAX - sizeof(struct udphdr)) |
| 971 | return -EMSGSIZE; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 972 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | if (up->pending) { |
| 974 | /* |
| 975 | * There are pending frames. |
| 976 | * The socket lock must be held while it's corked. |
| 977 | */ |
| 978 | lock_sock(sk); |
| 979 | if (likely(up->pending)) { |
| 980 | if (unlikely(up->pending != AF_INET6)) { |
| 981 | release_sock(sk); |
| 982 | return -EAFNOSUPPORT; |
| 983 | } |
| 984 | dst = NULL; |
| 985 | goto do_append_data; |
| 986 | } |
| 987 | release_sock(sk); |
| 988 | } |
| 989 | ulen += sizeof(struct udphdr); |
| 990 | |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 991 | memset(&fl, 0, sizeof(fl)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | |
| 993 | if (sin6) { |
| 994 | if (sin6->sin6_port == 0) |
| 995 | return -EINVAL; |
| 996 | |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 997 | fl.fl_ip_dport = sin6->sin6_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | daddr = &sin6->sin6_addr; |
| 999 | |
| 1000 | if (np->sndflow) { |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1001 | fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| 1002 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { |
| 1003 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | if (flowlabel == NULL) |
| 1005 | return -EINVAL; |
| 1006 | daddr = &flowlabel->dst; |
| 1007 | } |
| 1008 | } |
| 1009 | |
| 1010 | /* |
| 1011 | * Otherwise it will be difficult to maintain |
| 1012 | * sk->sk_dst_cache. |
| 1013 | */ |
| 1014 | if (sk->sk_state == TCP_ESTABLISHED && |
| 1015 | ipv6_addr_equal(daddr, &np->daddr)) |
| 1016 | daddr = &np->daddr; |
| 1017 | |
| 1018 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 1019 | sin6->sin6_scope_id && |
| 1020 | ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1021 | fl.oif = sin6->sin6_scope_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | } else { |
| 1023 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1024 | return -EDESTADDRREQ; |
| 1025 | |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1026 | fl.fl_ip_dport = inet->inet_dport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | daddr = &np->daddr; |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1028 | fl.fl6_flowlabel = np->flow_label; |
Mitsuru KANDA | 987905d | 2005-09-18 00:30:08 -0700 | [diff] [blame] | 1029 | connected = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | } |
| 1031 | |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1032 | if (!fl.oif) |
| 1033 | fl.oif = sk->sk_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | |
Yang Hongyang | 9f690db | 2008-12-16 02:08:29 -0800 | [diff] [blame] | 1035 | if (!fl.oif) |
| 1036 | fl.oif = np->sticky_pktinfo.ipi6_ifindex; |
| 1037 | |
Brian Haley | 51953d5 | 2009-10-05 08:24:16 +0000 | [diff] [blame] | 1038 | fl.mark = sk->sk_mark; |
| 1039 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | if (msg->msg_controllen) { |
| 1041 | opt = &opt_space; |
| 1042 | memset(opt, 0, sizeof(struct ipv6_txoptions)); |
| 1043 | opt->tot_len = sizeof(*opt); |
| 1044 | |
YOSHIFUJI Hideaki | 91e1908 | 2008-06-04 13:02:49 +0900 | [diff] [blame] | 1045 | err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | if (err < 0) { |
| 1047 | fl6_sock_release(flowlabel); |
| 1048 | return err; |
| 1049 | } |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1050 | if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
| 1051 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | if (flowlabel == NULL) |
| 1053 | return -EINVAL; |
| 1054 | } |
| 1055 | if (!(opt->opt_nflen|opt->opt_flen)) |
| 1056 | opt = NULL; |
Mitsuru KANDA | 987905d | 2005-09-18 00:30:08 -0700 | [diff] [blame] | 1057 | connected = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | } |
| 1059 | if (opt == NULL) |
| 1060 | opt = np->opt; |
YOSHIFUJI Hideaki | df9890c | 2005-11-20 12:23:18 +0900 | [diff] [blame] | 1061 | if (flowlabel) |
| 1062 | opt = fl6_merge_options(&opt_space, flowlabel, opt); |
| 1063 | opt = ipv6_fixup_options(&opt_space, opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1065 | fl.proto = sk->sk_protocol; |
Brian Haley | 876c7f4 | 2008-04-11 00:38:24 -0400 | [diff] [blame] | 1066 | if (!ipv6_addr_any(daddr)) |
| 1067 | ipv6_addr_copy(&fl.fl6_dst, daddr); |
| 1068 | else |
| 1069 | fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1070 | if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) |
| 1071 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1072 | fl.fl_ip_sport = inet->inet_sport; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1073 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | /* merge ip6_build_xmit from ip6_output */ |
| 1075 | if (opt && opt->srcrt) { |
| 1076 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1077 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 1078 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | final_p = &final; |
Mitsuru KANDA | 987905d | 2005-09-18 00:30:08 -0700 | [diff] [blame] | 1080 | connected = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | } |
| 1082 | |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1083 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { |
| 1084 | fl.oif = np->mcast_oif; |
Mitsuru KANDA | 987905d | 2005-09-18 00:30:08 -0700 | [diff] [blame] | 1085 | connected = 0; |
| 1086 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1088 | security_sk_classify_flow(sk, &fl); |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 1089 | |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1090 | err = ip6_sk_dst_lookup(sk, &dst, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | if (err) |
| 1092 | goto out; |
| 1093 | if (final_p) |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1094 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | |
Alexey Dobriyan | 52479b6 | 2008-11-25 17:35:18 -0800 | [diff] [blame] | 1096 | err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); |
| 1097 | if (err < 0) { |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 1098 | if (err == -EREMOTE) |
| 1099 | err = ip6_dst_blackhole(sk, &dst, &fl); |
| 1100 | if (err < 0) |
| 1101 | goto out; |
| 1102 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | |
| 1104 | if (hlimit < 0) { |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1105 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | hlimit = np->mcast_hops; |
| 1107 | else |
| 1108 | hlimit = np->hop_limit; |
| 1109 | if (hlimit < 0) |
YOSHIFUJI Hideaki | 6b75d09 | 2008-03-10 06:00:30 -0400 | [diff] [blame] | 1110 | hlimit = ip6_dst_hoplimit(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | } |
| 1112 | |
Gerrit Renker | e651f03 | 2009-08-09 08:12:48 +0000 | [diff] [blame] | 1113 | if (tclass < 0) |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1114 | tclass = np->tclass; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | if (msg->msg_flags&MSG_CONFIRM) |
| 1117 | goto do_confirm; |
| 1118 | back_from_confirm: |
| 1119 | |
| 1120 | lock_sock(sk); |
| 1121 | if (unlikely(up->pending)) { |
| 1122 | /* The socket is already corked while preparing it. */ |
| 1123 | /* ... which is an evident application bug. --ANK */ |
| 1124 | release_sock(sk); |
| 1125 | |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 1126 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | err = -EINVAL; |
| 1128 | goto out; |
| 1129 | } |
| 1130 | |
| 1131 | up->pending = AF_INET6; |
| 1132 | |
| 1133 | do_append_data: |
| 1134 | up->len += ulen; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1135 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
| 1136 | err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1137 | sizeof(struct udphdr), hlimit, tclass, opt, &fl, |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1138 | (struct rt6_info*)dst, |
| 1139 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | if (err) |
| 1141 | udp_v6_flush_pending_frames(sk); |
| 1142 | else if (!corkreq) |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1143 | err = udp_v6_push_pending_frames(sk); |
Herbert Xu | 1e0c14f | 2006-10-03 14:35:49 -0700 | [diff] [blame] | 1144 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
| 1145 | up->pending = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | |
David S. Miller | a5e7c21 | 2005-10-03 14:21:58 -0700 | [diff] [blame] | 1147 | if (dst) { |
| 1148 | if (connected) { |
| 1149 | ip6_dst_store(sk, dst, |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1150 | ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 1151 | &np->daddr : NULL, |
| 1152 | #ifdef CONFIG_IPV6_SUBTREES |
Herbert Xu | 132a55f | 2006-10-03 14:34:00 -0700 | [diff] [blame] | 1153 | ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 1154 | &np->saddr : |
| 1155 | #endif |
| 1156 | NULL); |
David S. Miller | a5e7c21 | 2005-10-03 14:21:58 -0700 | [diff] [blame] | 1157 | } else { |
| 1158 | dst_release(dst); |
| 1159 | } |
YOSHIFUJI Hideaki | a3c9608 | 2008-06-04 01:30:25 +0900 | [diff] [blame] | 1160 | dst = NULL; |
David S. Miller | a5e7c21 | 2005-10-03 14:21:58 -0700 | [diff] [blame] | 1161 | } |
| 1162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | if (err > 0) |
| 1164 | err = np->recverr ? net_xmit_errno(err) : 0; |
| 1165 | release_sock(sk); |
| 1166 | out: |
YOSHIFUJI Hideaki | a3c9608 | 2008-06-04 01:30:25 +0900 | [diff] [blame] | 1167 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | fl6_sock_release(flowlabel); |
YOSHIFUJI Hideaki | cd562c9 | 2007-09-14 17:15:01 -0700 | [diff] [blame] | 1169 | if (!err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | return len; |
David S. Miller | a18135e | 2006-08-15 00:00:09 -0700 | [diff] [blame] | 1171 | /* |
| 1172 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting |
| 1173 | * ENOBUFS might not be good (it's not tunable per se), but otherwise |
| 1174 | * we don't have a good statistic (IpOutDiscards but it can be too many |
| 1175 | * things). We could add another new stat but at least for now that |
| 1176 | * seems like overkill. |
| 1177 | */ |
| 1178 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { |
Pavel Emelyanov | 235b9f7 | 2008-07-05 21:19:20 -0700 | [diff] [blame] | 1179 | UDP6_INC_STATS_USER(sock_net(sk), |
| 1180 | UDP_MIB_SNDBUFERRORS, is_udplite); |
David S. Miller | a18135e | 2006-08-15 00:00:09 -0700 | [diff] [blame] | 1181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | return err; |
| 1183 | |
| 1184 | do_confirm: |
| 1185 | dst_confirm(dst); |
| 1186 | if (!(msg->msg_flags&MSG_PROBE) || len) |
| 1187 | goto back_from_confirm; |
| 1188 | err = 0; |
| 1189 | goto out; |
| 1190 | } |
| 1191 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1192 | void udpv6_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | { |
| 1194 | lock_sock(sk); |
| 1195 | udp_v6_flush_pending_frames(sk); |
| 1196 | release_sock(sk); |
| 1197 | |
| 1198 | inet6_destroy_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | } |
| 1200 | |
| 1201 | /* |
| 1202 | * Socket option code for UDP |
| 1203 | */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1204 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1205 | char __user *optval, unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1206 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1207 | if (level == SOL_UDP || level == SOL_UDPLITE) |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1208 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 1209 | udp_v6_push_pending_frames); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1210 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1211 | } |
| 1212 | |
| 1213 | #ifdef CONFIG_COMPAT |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1214 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1215 | char __user *optval, unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1216 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1217 | if (level == SOL_UDP || level == SOL_UDPLITE) |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1218 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 1219 | udp_v6_push_pending_frames); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1220 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1221 | } |
| 1222 | #endif |
| 1223 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1224 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
| 1225 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1226 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1227 | if (level == SOL_UDP || level == SOL_UDPLITE) |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1228 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1229 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1230 | } |
| 1231 | |
| 1232 | #ifdef CONFIG_COMPAT |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1233 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
| 1234 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1235 | { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1236 | if (level == SOL_UDP || level == SOL_UDPLITE) |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1237 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1238 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1239 | } |
| 1240 | #endif |
| 1241 | |
Sridhar Samudrala | ba73542 | 2009-07-09 08:10:04 +0000 | [diff] [blame] | 1242 | static int udp6_ufo_send_check(struct sk_buff *skb) |
| 1243 | { |
| 1244 | struct ipv6hdr *ipv6h; |
| 1245 | struct udphdr *uh; |
| 1246 | |
| 1247 | if (!pskb_may_pull(skb, sizeof(*uh))) |
| 1248 | return -EINVAL; |
| 1249 | |
| 1250 | ipv6h = ipv6_hdr(skb); |
| 1251 | uh = udp_hdr(skb); |
| 1252 | |
| 1253 | uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, |
| 1254 | IPPROTO_UDP, 0); |
| 1255 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 1256 | skb->csum_offset = offsetof(struct udphdr, check); |
| 1257 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 1258 | return 0; |
| 1259 | } |
| 1260 | |
| 1261 | static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features) |
| 1262 | { |
| 1263 | struct sk_buff *segs = ERR_PTR(-EINVAL); |
| 1264 | unsigned int mss; |
| 1265 | unsigned int unfrag_ip6hlen, unfrag_len; |
| 1266 | struct frag_hdr *fptr; |
| 1267 | u8 *mac_start, *prevhdr; |
| 1268 | u8 nexthdr; |
| 1269 | u8 frag_hdr_sz = sizeof(struct frag_hdr); |
| 1270 | int offset; |
| 1271 | __wsum csum; |
| 1272 | |
| 1273 | mss = skb_shinfo(skb)->gso_size; |
| 1274 | if (unlikely(skb->len <= mss)) |
| 1275 | goto out; |
| 1276 | |
| 1277 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { |
| 1278 | /* Packet is from an untrusted source, reset gso_segs. */ |
| 1279 | int type = skb_shinfo(skb)->gso_type; |
| 1280 | |
| 1281 | if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || |
| 1282 | !(type & (SKB_GSO_UDP)))) |
| 1283 | goto out; |
| 1284 | |
| 1285 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); |
| 1286 | |
| 1287 | segs = NULL; |
| 1288 | goto out; |
| 1289 | } |
| 1290 | |
| 1291 | /* Do software UFO. Complete and fill in the UDP checksum as HW cannot |
| 1292 | * do checksum of UDP packets sent as multiple IP fragments. |
| 1293 | */ |
| 1294 | offset = skb->csum_start - skb_headroom(skb); |
| 1295 | csum = skb_checksum(skb, offset, skb->len- offset, 0); |
| 1296 | offset += skb->csum_offset; |
| 1297 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
| 1298 | skb->ip_summed = CHECKSUM_NONE; |
| 1299 | |
| 1300 | /* Check if there is enough headroom to insert fragment header. */ |
| 1301 | if ((skb_headroom(skb) < frag_hdr_sz) && |
| 1302 | pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) |
| 1303 | goto out; |
| 1304 | |
| 1305 | /* Find the unfragmentable header and shift it left by frag_hdr_sz |
| 1306 | * bytes to insert fragment header. |
| 1307 | */ |
| 1308 | unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); |
| 1309 | nexthdr = *prevhdr; |
| 1310 | *prevhdr = NEXTHDR_FRAGMENT; |
| 1311 | unfrag_len = skb_network_header(skb) - skb_mac_header(skb) + |
| 1312 | unfrag_ip6hlen; |
| 1313 | mac_start = skb_mac_header(skb); |
| 1314 | memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); |
| 1315 | |
| 1316 | skb->mac_header -= frag_hdr_sz; |
| 1317 | skb->network_header -= frag_hdr_sz; |
| 1318 | |
| 1319 | fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); |
| 1320 | fptr->nexthdr = nexthdr; |
| 1321 | fptr->reserved = 0; |
| 1322 | ipv6_select_ident(fptr); |
| 1323 | |
| 1324 | /* Fragment the skb. ipv6 header and the remaining fields of the |
| 1325 | * fragment header are updated in ipv6_gso_segment() |
| 1326 | */ |
| 1327 | segs = skb_segment(skb, features); |
| 1328 | |
| 1329 | out: |
| 1330 | return segs; |
| 1331 | } |
| 1332 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 1333 | static const struct inet6_protocol udpv6_protocol = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | .handler = udpv6_rcv, |
| 1335 | .err_handler = udpv6_err, |
Sridhar Samudrala | ba73542 | 2009-07-09 08:10:04 +0000 | [diff] [blame] | 1336 | .gso_send_check = udp6_ufo_send_check, |
| 1337 | .gso_segment = udp6_ufo_fragment, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| 1339 | }; |
| 1340 | |
| 1341 | /* ------------------------------------------------------------------------ */ |
| 1342 | #ifdef CONFIG_PROC_FS |
| 1343 | |
| 1344 | static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) |
| 1345 | { |
| 1346 | struct inet_sock *inet = inet_sk(sp); |
| 1347 | struct ipv6_pinfo *np = inet6_sk(sp); |
| 1348 | struct in6_addr *dest, *src; |
| 1349 | __u16 destp, srcp; |
| 1350 | |
| 1351 | dest = &np->daddr; |
| 1352 | src = &np->rcv_saddr; |
Eric Dumazet | c720c7e8 | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1353 | destp = ntohs(inet->inet_dport); |
| 1354 | srcp = ntohs(inet->inet_sport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | seq_printf(seq, |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 1356 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 1357 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | bucket, |
| 1359 | src->s6_addr32[0], src->s6_addr32[1], |
| 1360 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 1361 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1362 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1363 | sp->sk_state, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 1364 | sk_wmem_alloc_get(sp), |
| 1365 | sk_rmem_alloc_get(sp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | 0, 0L, 0, |
| 1367 | sock_i_uid(sp), 0, |
| 1368 | sock_i_ino(sp), |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 1369 | atomic_read(&sp->sk_refcnt), sp, |
| 1370 | atomic_read(&sp->sk_drops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | } |
| 1372 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1373 | int udp6_seq_show(struct seq_file *seq, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | { |
| 1375 | if (v == SEQ_START_TOKEN) |
| 1376 | seq_printf(seq, |
| 1377 | " sl " |
| 1378 | "local_address " |
| 1379 | "remote_address " |
| 1380 | "st tx_queue rx_queue tr tm->when retrnsmt" |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 1381 | " uid timeout inode ref pointer drops\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | else |
| 1383 | udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); |
| 1384 | return 0; |
| 1385 | } |
| 1386 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | .name = "udp6", |
| 1389 | .family = AF_INET6, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1390 | .udp_table = &udp_table, |
Denis V. Lunev | 4ad96d3 | 2008-03-28 18:25:53 -0700 | [diff] [blame] | 1391 | .seq_fops = { |
| 1392 | .owner = THIS_MODULE, |
| 1393 | }, |
Denis V. Lunev | dda6192 | 2008-03-28 18:24:26 -0700 | [diff] [blame] | 1394 | .seq_ops = { |
| 1395 | .show = udp6_seq_show, |
| 1396 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | }; |
| 1398 | |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 1399 | int udp6_proc_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | { |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 1401 | return udp_proc_register(net, &udp6_seq_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | } |
| 1403 | |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 1404 | void udp6_proc_exit(struct net *net) { |
| 1405 | udp_proc_unregister(net, &udp6_seq_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | } |
| 1407 | #endif /* CONFIG_PROC_FS */ |
| 1408 | |
| 1409 | /* ------------------------------------------------------------------------ */ |
| 1410 | |
| 1411 | struct proto udpv6_prot = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1412 | .name = "UDPv6", |
| 1413 | .owner = THIS_MODULE, |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1414 | .close = udp_lib_close, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1415 | .connect = ip6_datagram_connect, |
| 1416 | .disconnect = udp_disconnect, |
| 1417 | .ioctl = udp_ioctl, |
| 1418 | .destroy = udpv6_destroy_sock, |
| 1419 | .setsockopt = udpv6_setsockopt, |
| 1420 | .getsockopt = udpv6_getsockopt, |
| 1421 | .sendmsg = udpv6_sendmsg, |
| 1422 | .recvmsg = udpv6_recvmsg, |
| 1423 | .backlog_rcv = udpv6_queue_rcv_skb, |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1424 | .hash = udp_lib_hash, |
| 1425 | .unhash = udp_lib_unhash, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1426 | .get_port = udp_v6_get_port, |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 1427 | .memory_allocated = &udp_memory_allocated, |
| 1428 | .sysctl_mem = sysctl_udp_mem, |
| 1429 | .sysctl_wmem = &sysctl_udp_wmem_min, |
| 1430 | .sysctl_rmem = &sysctl_udp_rmem_min, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1431 | .obj_size = sizeof(struct udp6_sock), |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 1432 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1433 | .h.udp_table = &udp_table, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1434 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1435 | .compat_setsockopt = compat_udpv6_setsockopt, |
| 1436 | .compat_getsockopt = compat_udpv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1437 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | }; |
| 1439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | static struct inet_protosw udpv6_protosw = { |
| 1441 | .type = SOCK_DGRAM, |
| 1442 | .protocol = IPPROTO_UDP, |
| 1443 | .prot = &udpv6_prot, |
| 1444 | .ops = &inet6_dgram_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | .no_check = UDP_CSUM_DEFAULT, |
| 1446 | .flags = INET_PROTOSW_PERMANENT, |
| 1447 | }; |
| 1448 | |
| 1449 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1450 | int __init udpv6_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | { |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1452 | int ret; |
| 1453 | |
| 1454 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
| 1455 | if (ret) |
| 1456 | goto out; |
| 1457 | |
| 1458 | ret = inet6_register_protosw(&udpv6_protosw); |
| 1459 | if (ret) |
| 1460 | goto out_udpv6_protocol; |
| 1461 | out: |
| 1462 | return ret; |
| 1463 | |
| 1464 | out_udpv6_protocol: |
| 1465 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); |
| 1466 | goto out; |
| 1467 | } |
| 1468 | |
Daniel Lezcano | 09f7709 | 2007-12-13 05:34:58 -0800 | [diff] [blame] | 1469 | void udpv6_exit(void) |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1470 | { |
| 1471 | inet6_unregister_protosw(&udpv6_protosw); |
| 1472 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | } |