Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * TCP over IPv6 |
| 3 | * Linux INET6 implementation |
| 4 | * |
| 5 | * Authors: |
| 6 | * Pedro Roque <roque@di.fc.ul.pt> |
| 7 | * |
| 8 | * $Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $ |
| 9 | * |
| 10 | * Based on: |
| 11 | * linux/net/ipv4/tcp.c |
| 12 | * linux/net/ipv4/tcp_input.c |
| 13 | * linux/net/ipv4/tcp_output.c |
| 14 | * |
| 15 | * Fixes: |
| 16 | * Hideaki YOSHIFUJI : sin6_scope_id support |
| 17 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| 18 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| 19 | * a single port at the same time. |
| 20 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. |
| 21 | * |
| 22 | * This program is free software; you can redistribute it and/or |
| 23 | * modify it under the terms of the GNU General Public License |
| 24 | * as published by the Free Software Foundation; either version |
| 25 | * 2 of the License, or (at your option) any later version. |
| 26 | */ |
| 27 | |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/config.h> |
| 30 | #include <linux/errno.h> |
| 31 | #include <linux/types.h> |
| 32 | #include <linux/socket.h> |
| 33 | #include <linux/sockios.h> |
| 34 | #include <linux/net.h> |
| 35 | #include <linux/jiffies.h> |
| 36 | #include <linux/in.h> |
| 37 | #include <linux/in6.h> |
| 38 | #include <linux/netdevice.h> |
| 39 | #include <linux/init.h> |
| 40 | #include <linux/jhash.h> |
| 41 | #include <linux/ipsec.h> |
| 42 | #include <linux/times.h> |
| 43 | |
| 44 | #include <linux/ipv6.h> |
| 45 | #include <linux/icmpv6.h> |
| 46 | #include <linux/random.h> |
| 47 | |
| 48 | #include <net/tcp.h> |
| 49 | #include <net/ndisc.h> |
Arnaldo Carvalho de Melo | 5324a04 | 2005-08-12 09:26:18 -0300 | [diff] [blame] | 50 | #include <net/inet6_hashtables.h> |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame^] | 51 | #include <net/inet6_connection_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include <net/ipv6.h> |
| 53 | #include <net/transp_v6.h> |
| 54 | #include <net/addrconf.h> |
| 55 | #include <net/ip6_route.h> |
| 56 | #include <net/ip6_checksum.h> |
| 57 | #include <net/inet_ecn.h> |
| 58 | #include <net/protocol.h> |
| 59 | #include <net/xfrm.h> |
| 60 | #include <net/addrconf.h> |
| 61 | #include <net/snmp.h> |
| 62 | #include <net/dsfield.h> |
| 63 | |
| 64 | #include <asm/uaccess.h> |
| 65 | |
| 66 | #include <linux/proc_fs.h> |
| 67 | #include <linux/seq_file.h> |
| 68 | |
| 69 | static void tcp_v6_send_reset(struct sk_buff *skb); |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 70 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, |
| 72 | struct sk_buff *skb); |
| 73 | |
| 74 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); |
| 75 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok); |
| 76 | |
| 77 | static struct tcp_func ipv6_mapped; |
| 78 | static struct tcp_func ipv6_specific; |
| 79 | |
Arnaldo Carvalho de Melo | 971af18 | 2005-12-13 23:14:47 -0800 | [diff] [blame] | 80 | int inet6_csk_bind_conflict(const struct sock *sk, |
| 81 | const struct inet_bind_bucket *tb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | { |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 83 | const struct sock *sk2; |
| 84 | const struct hlist_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | /* We must walk the whole port owner list in this case. -DaveM */ |
| 87 | sk_for_each_bound(sk2, node, &tb->owners) { |
| 88 | if (sk != sk2 && |
| 89 | (!sk->sk_bound_dev_if || |
| 90 | !sk2->sk_bound_dev_if || |
| 91 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && |
| 92 | (!sk->sk_reuse || !sk2->sk_reuse || |
| 93 | sk2->sk_state == TCP_LISTEN) && |
| 94 | ipv6_rcv_saddr_equal(sk, sk2)) |
| 95 | break; |
| 96 | } |
| 97 | |
| 98 | return node != NULL; |
| 99 | } |
| 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | static int tcp_v6_get_port(struct sock *sk, unsigned short snum) |
| 102 | { |
Arnaldo Carvalho de Melo | 971af18 | 2005-12-13 23:14:47 -0800 | [diff] [blame] | 103 | return inet_csk_get_port(&tcp_hashinfo, sk, snum, |
| 104 | inet6_csk_bind_conflict); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | static void tcp_v6_hash(struct sock *sk) |
| 108 | { |
| 109 | if (sk->sk_state != TCP_CLOSE) { |
| 110 | struct tcp_sock *tp = tcp_sk(sk); |
| 111 | |
| 112 | if (tp->af_specific == &ipv6_mapped) { |
| 113 | tcp_prot.hash(sk); |
| 114 | return; |
| 115 | } |
| 116 | local_bh_disable(); |
Arnaldo Carvalho de Melo | 90b19d3 | 2005-12-13 23:15:01 -0800 | [diff] [blame] | 117 | __inet6_hash(&tcp_hashinfo, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | local_bh_enable(); |
| 119 | } |
| 120 | } |
| 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len, |
| 123 | struct in6_addr *saddr, |
| 124 | struct in6_addr *daddr, |
| 125 | unsigned long base) |
| 126 | { |
| 127 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); |
| 128 | } |
| 129 | |
| 130 | static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb) |
| 131 | { |
| 132 | if (skb->protocol == htons(ETH_P_IPV6)) { |
| 133 | return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32, |
| 134 | skb->nh.ipv6h->saddr.s6_addr32, |
| 135 | skb->h.th->dest, |
| 136 | skb->h.th->source); |
| 137 | } else { |
| 138 | return secure_tcp_sequence_number(skb->nh.iph->daddr, |
| 139 | skb->nh.iph->saddr, |
| 140 | skb->h.th->dest, |
| 141 | skb->h.th->source); |
| 142 | } |
| 143 | } |
| 144 | |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 145 | static int __tcp_v6_check_established(struct sock *sk, const __u16 lport, |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 146 | struct inet_timewait_sock **twp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
| 148 | struct inet_sock *inet = inet_sk(sk); |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 149 | const struct ipv6_pinfo *np = inet6_sk(sk); |
| 150 | const struct in6_addr *daddr = &np->rcv_saddr; |
| 151 | const struct in6_addr *saddr = &np->daddr; |
| 152 | const int dif = sk->sk_bound_dev_if; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 153 | const u32 ports = INET_COMBINED_PORTS(inet->dport, lport); |
Eric Dumazet | 81c3d54 | 2005-10-03 14:13:38 -0700 | [diff] [blame] | 154 | unsigned int hash = inet6_ehashfn(daddr, inet->num, saddr, inet->dport); |
| 155 | struct inet_ehash_bucket *head = inet_ehash_bucket(&tcp_hashinfo, hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | struct sock *sk2; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 157 | const struct hlist_node *node; |
| 158 | struct inet_timewait_sock *tw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
Eric Dumazet | 81c3d54 | 2005-10-03 14:13:38 -0700 | [diff] [blame] | 160 | prefetch(head->chain.first); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | write_lock(&head->lock); |
| 162 | |
| 163 | /* Check TIME-WAIT sockets first. */ |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 164 | sk_for_each(sk2, node, &(head + tcp_hashinfo.ehash_size)->chain) { |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 165 | const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk2); |
| 166 | |
| 167 | tw = inet_twsk(sk2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
| 169 | if(*((__u32 *)&(tw->tw_dport)) == ports && |
| 170 | sk2->sk_family == PF_INET6 && |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 171 | ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) && |
| 172 | ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) { |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 174 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | struct tcp_sock *tp = tcp_sk(sk); |
| 176 | |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 177 | if (tcptw->tw_ts_recent_stamp && |
| 178 | (!twp || |
| 179 | (sysctl_tcp_tw_reuse && |
| 180 | xtime.tv_sec - tcptw->tw_ts_recent_stamp > 1))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | /* See comment in tcp_ipv4.c */ |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 182 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | if (!tp->write_seq) |
| 184 | tp->write_seq = 1; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 185 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; |
| 186 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | sock_hold(sk2); |
| 188 | goto unique; |
| 189 | } else |
| 190 | goto not_unique; |
| 191 | } |
| 192 | } |
| 193 | tw = NULL; |
| 194 | |
| 195 | /* And established part... */ |
| 196 | sk_for_each(sk2, node, &head->chain) { |
Eric Dumazet | 81c3d54 | 2005-10-03 14:13:38 -0700 | [diff] [blame] | 197 | if (INET6_MATCH(sk2, hash, saddr, daddr, ports, dif)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | goto not_unique; |
| 199 | } |
| 200 | |
| 201 | unique: |
| 202 | BUG_TRAP(sk_unhashed(sk)); |
| 203 | __sk_add_node(sk, &head->chain); |
Eric Dumazet | 81c3d54 | 2005-10-03 14:13:38 -0700 | [diff] [blame] | 204 | sk->sk_hash = hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | sock_prot_inc_use(sk->sk_prot); |
| 206 | write_unlock(&head->lock); |
| 207 | |
| 208 | if (twp) { |
| 209 | *twp = tw; |
| 210 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); |
| 211 | } else if (tw) { |
| 212 | /* Silly. Should hash-dance instead... */ |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 213 | inet_twsk_deschedule(tw, &tcp_death_row); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); |
| 215 | |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 216 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | return 0; |
| 219 | |
| 220 | not_unique: |
| 221 | write_unlock(&head->lock); |
| 222 | return -EADDRNOTAVAIL; |
| 223 | } |
| 224 | |
| 225 | static inline u32 tcpv6_port_offset(const struct sock *sk) |
| 226 | { |
| 227 | const struct inet_sock *inet = inet_sk(sk); |
| 228 | const struct ipv6_pinfo *np = inet6_sk(sk); |
| 229 | |
| 230 | return secure_tcpv6_port_ephemeral(np->rcv_saddr.s6_addr32, |
| 231 | np->daddr.s6_addr32, |
| 232 | inet->dport); |
| 233 | } |
| 234 | |
| 235 | static int tcp_v6_hash_connect(struct sock *sk) |
| 236 | { |
| 237 | unsigned short snum = inet_sk(sk)->num; |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 238 | struct inet_bind_hashbucket *head; |
| 239 | struct inet_bind_bucket *tb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | int ret; |
| 241 | |
| 242 | if (!snum) { |
| 243 | int low = sysctl_local_port_range[0]; |
| 244 | int high = sysctl_local_port_range[1]; |
| 245 | int range = high - low; |
| 246 | int i; |
| 247 | int port; |
| 248 | static u32 hint; |
| 249 | u32 offset = hint + tcpv6_port_offset(sk); |
| 250 | struct hlist_node *node; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 251 | struct inet_timewait_sock *tw = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
| 253 | local_bh_disable(); |
| 254 | for (i = 1; i <= range; i++) { |
| 255 | port = low + (i + offset) % range; |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 256 | head = &tcp_hashinfo.bhash[inet_bhashfn(port, tcp_hashinfo.bhash_size)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | spin_lock(&head->lock); |
| 258 | |
| 259 | /* Does not bother with rcv_saddr checks, |
| 260 | * because the established check is already |
| 261 | * unique enough. |
| 262 | */ |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 263 | inet_bind_bucket_for_each(tb, node, &head->chain) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | if (tb->port == port) { |
| 265 | BUG_TRAP(!hlist_empty(&tb->owners)); |
| 266 | if (tb->fastreuse >= 0) |
| 267 | goto next_port; |
| 268 | if (!__tcp_v6_check_established(sk, |
| 269 | port, |
| 270 | &tw)) |
| 271 | goto ok; |
| 272 | goto next_port; |
| 273 | } |
| 274 | } |
| 275 | |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 276 | tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | if (!tb) { |
| 278 | spin_unlock(&head->lock); |
| 279 | break; |
| 280 | } |
| 281 | tb->fastreuse = -1; |
| 282 | goto ok; |
| 283 | |
| 284 | next_port: |
| 285 | spin_unlock(&head->lock); |
| 286 | } |
| 287 | local_bh_enable(); |
| 288 | |
| 289 | return -EADDRNOTAVAIL; |
| 290 | |
| 291 | ok: |
| 292 | hint += i; |
| 293 | |
| 294 | /* Head lock still held and bh's disabled */ |
Arnaldo Carvalho de Melo | 2d8c4ce | 2005-08-09 20:07:13 -0700 | [diff] [blame] | 295 | inet_bind_hash(sk, tb, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | if (sk_unhashed(sk)) { |
| 297 | inet_sk(sk)->sport = htons(port); |
Arnaldo Carvalho de Melo | 90b19d3 | 2005-12-13 23:15:01 -0800 | [diff] [blame] | 298 | __inet6_hash(&tcp_hashinfo, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | } |
| 300 | spin_unlock(&head->lock); |
| 301 | |
| 302 | if (tw) { |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 303 | inet_twsk_deschedule(tw, &tcp_death_row); |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 304 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | ret = 0; |
| 308 | goto out; |
| 309 | } |
| 310 | |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 311 | head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)]; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 312 | tb = inet_csk(sk)->icsk_bind_hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | spin_lock_bh(&head->lock); |
| 314 | |
| 315 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { |
Arnaldo Carvalho de Melo | 90b19d3 | 2005-12-13 23:15:01 -0800 | [diff] [blame] | 316 | __inet6_hash(&tcp_hashinfo, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | spin_unlock_bh(&head->lock); |
| 318 | return 0; |
| 319 | } else { |
| 320 | spin_unlock(&head->lock); |
| 321 | /* No definite answer... Walk to established hash table */ |
| 322 | ret = __tcp_v6_check_established(sk, snum, NULL); |
| 323 | out: |
| 324 | local_bh_enable(); |
| 325 | return ret; |
| 326 | } |
| 327 | } |
| 328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
| 330 | int addr_len) |
| 331 | { |
| 332 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; |
| 333 | struct inet_sock *inet = inet_sk(sk); |
| 334 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 335 | struct tcp_sock *tp = tcp_sk(sk); |
| 336 | struct in6_addr *saddr = NULL, *final_p = NULL, final; |
| 337 | struct flowi fl; |
| 338 | struct dst_entry *dst; |
| 339 | int addr_type; |
| 340 | int err; |
| 341 | |
| 342 | if (addr_len < SIN6_LEN_RFC2133) |
| 343 | return -EINVAL; |
| 344 | |
| 345 | if (usin->sin6_family != AF_INET6) |
| 346 | return(-EAFNOSUPPORT); |
| 347 | |
| 348 | memset(&fl, 0, sizeof(fl)); |
| 349 | |
| 350 | if (np->sndflow) { |
| 351 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| 352 | IP6_ECN_flow_init(fl.fl6_flowlabel); |
| 353 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { |
| 354 | struct ip6_flowlabel *flowlabel; |
| 355 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); |
| 356 | if (flowlabel == NULL) |
| 357 | return -EINVAL; |
| 358 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); |
| 359 | fl6_sock_release(flowlabel); |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * connect() to INADDR_ANY means loopback (BSD'ism). |
| 365 | */ |
| 366 | |
| 367 | if(ipv6_addr_any(&usin->sin6_addr)) |
| 368 | usin->sin6_addr.s6_addr[15] = 0x1; |
| 369 | |
| 370 | addr_type = ipv6_addr_type(&usin->sin6_addr); |
| 371 | |
| 372 | if(addr_type & IPV6_ADDR_MULTICAST) |
| 373 | return -ENETUNREACH; |
| 374 | |
| 375 | if (addr_type&IPV6_ADDR_LINKLOCAL) { |
| 376 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 377 | usin->sin6_scope_id) { |
| 378 | /* If interface is set while binding, indices |
| 379 | * must coincide. |
| 380 | */ |
| 381 | if (sk->sk_bound_dev_if && |
| 382 | sk->sk_bound_dev_if != usin->sin6_scope_id) |
| 383 | return -EINVAL; |
| 384 | |
| 385 | sk->sk_bound_dev_if = usin->sin6_scope_id; |
| 386 | } |
| 387 | |
| 388 | /* Connect to link-local address requires an interface */ |
| 389 | if (!sk->sk_bound_dev_if) |
| 390 | return -EINVAL; |
| 391 | } |
| 392 | |
| 393 | if (tp->rx_opt.ts_recent_stamp && |
| 394 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { |
| 395 | tp->rx_opt.ts_recent = 0; |
| 396 | tp->rx_opt.ts_recent_stamp = 0; |
| 397 | tp->write_seq = 0; |
| 398 | } |
| 399 | |
| 400 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); |
| 401 | np->flow_label = fl.fl6_flowlabel; |
| 402 | |
| 403 | /* |
| 404 | * TCP over IPv4 |
| 405 | */ |
| 406 | |
| 407 | if (addr_type == IPV6_ADDR_MAPPED) { |
| 408 | u32 exthdrlen = tp->ext_header_len; |
| 409 | struct sockaddr_in sin; |
| 410 | |
| 411 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); |
| 412 | |
| 413 | if (__ipv6_only_sock(sk)) |
| 414 | return -ENETUNREACH; |
| 415 | |
| 416 | sin.sin_family = AF_INET; |
| 417 | sin.sin_port = usin->sin6_port; |
| 418 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
| 419 | |
| 420 | tp->af_specific = &ipv6_mapped; |
| 421 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
| 422 | |
| 423 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); |
| 424 | |
| 425 | if (err) { |
| 426 | tp->ext_header_len = exthdrlen; |
| 427 | tp->af_specific = &ipv6_specific; |
| 428 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
| 429 | goto failure; |
| 430 | } else { |
| 431 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), |
| 432 | inet->saddr); |
| 433 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), |
| 434 | inet->rcv_saddr); |
| 435 | } |
| 436 | |
| 437 | return err; |
| 438 | } |
| 439 | |
| 440 | if (!ipv6_addr_any(&np->rcv_saddr)) |
| 441 | saddr = &np->rcv_saddr; |
| 442 | |
| 443 | fl.proto = IPPROTO_TCP; |
| 444 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 445 | ipv6_addr_copy(&fl.fl6_src, |
| 446 | (saddr ? saddr : &np->saddr)); |
| 447 | fl.oif = sk->sk_bound_dev_if; |
| 448 | fl.fl_ip_dport = usin->sin6_port; |
| 449 | fl.fl_ip_sport = inet->sport; |
| 450 | |
| 451 | if (np->opt && np->opt->srcrt) { |
| 452 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; |
| 453 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 454 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 455 | final_p = &final; |
| 456 | } |
| 457 | |
| 458 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 459 | if (err) |
| 460 | goto failure; |
| 461 | if (final_p) |
| 462 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 463 | |
Patrick McHardy | e104411 | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 464 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | goto failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | if (saddr == NULL) { |
| 468 | saddr = &fl.fl6_src; |
| 469 | ipv6_addr_copy(&np->rcv_saddr, saddr); |
| 470 | } |
| 471 | |
| 472 | /* set the source address */ |
| 473 | ipv6_addr_copy(&np->saddr, saddr); |
| 474 | inet->rcv_saddr = LOOPBACK4_IPV6; |
| 475 | |
| 476 | ip6_dst_store(sk, dst, NULL); |
| 477 | sk->sk_route_caps = dst->dev->features & |
| 478 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); |
| 479 | |
| 480 | tp->ext_header_len = 0; |
| 481 | if (np->opt) |
| 482 | tp->ext_header_len = np->opt->opt_flen + np->opt->opt_nflen; |
| 483 | |
| 484 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| 485 | |
| 486 | inet->dport = usin->sin6_port; |
| 487 | |
| 488 | tcp_set_state(sk, TCP_SYN_SENT); |
| 489 | err = tcp_v6_hash_connect(sk); |
| 490 | if (err) |
| 491 | goto late_failure; |
| 492 | |
| 493 | if (!tp->write_seq) |
| 494 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
| 495 | np->daddr.s6_addr32, |
| 496 | inet->sport, |
| 497 | inet->dport); |
| 498 | |
| 499 | err = tcp_connect(sk); |
| 500 | if (err) |
| 501 | goto late_failure; |
| 502 | |
| 503 | return 0; |
| 504 | |
| 505 | late_failure: |
| 506 | tcp_set_state(sk, TCP_CLOSE); |
| 507 | __sk_dst_reset(sk); |
| 508 | failure: |
| 509 | inet->dport = 0; |
| 510 | sk->sk_route_caps = 0; |
| 511 | return err; |
| 512 | } |
| 513 | |
| 514 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| 515 | int type, int code, int offset, __u32 info) |
| 516 | { |
| 517 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 518 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | struct ipv6_pinfo *np; |
| 520 | struct sock *sk; |
| 521 | int err; |
| 522 | struct tcp_sock *tp; |
| 523 | __u32 seq; |
| 524 | |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 525 | sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr, |
| 526 | th->source, skb->dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
| 528 | if (sk == NULL) { |
| 529 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
| 530 | return; |
| 531 | } |
| 532 | |
| 533 | if (sk->sk_state == TCP_TIME_WAIT) { |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 534 | inet_twsk_put((struct inet_timewait_sock *)sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | return; |
| 536 | } |
| 537 | |
| 538 | bh_lock_sock(sk); |
| 539 | if (sock_owned_by_user(sk)) |
| 540 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); |
| 541 | |
| 542 | if (sk->sk_state == TCP_CLOSE) |
| 543 | goto out; |
| 544 | |
| 545 | tp = tcp_sk(sk); |
| 546 | seq = ntohl(th->seq); |
| 547 | if (sk->sk_state != TCP_LISTEN && |
| 548 | !between(seq, tp->snd_una, tp->snd_nxt)) { |
| 549 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
| 550 | goto out; |
| 551 | } |
| 552 | |
| 553 | np = inet6_sk(sk); |
| 554 | |
| 555 | if (type == ICMPV6_PKT_TOOBIG) { |
| 556 | struct dst_entry *dst = NULL; |
| 557 | |
| 558 | if (sock_owned_by_user(sk)) |
| 559 | goto out; |
| 560 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) |
| 561 | goto out; |
| 562 | |
| 563 | /* icmp should have updated the destination cache entry */ |
| 564 | dst = __sk_dst_check(sk, np->dst_cookie); |
| 565 | |
| 566 | if (dst == NULL) { |
| 567 | struct inet_sock *inet = inet_sk(sk); |
| 568 | struct flowi fl; |
| 569 | |
| 570 | /* BUGGG_FUTURE: Again, it is not clear how |
| 571 | to handle rthdr case. Ignore this complexity |
| 572 | for now. |
| 573 | */ |
| 574 | memset(&fl, 0, sizeof(fl)); |
| 575 | fl.proto = IPPROTO_TCP; |
| 576 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 577 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| 578 | fl.oif = sk->sk_bound_dev_if; |
| 579 | fl.fl_ip_dport = inet->dport; |
| 580 | fl.fl_ip_sport = inet->sport; |
| 581 | |
| 582 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { |
| 583 | sk->sk_err_soft = -err; |
| 584 | goto out; |
| 585 | } |
| 586 | |
| 587 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { |
| 588 | sk->sk_err_soft = -err; |
| 589 | goto out; |
| 590 | } |
| 591 | |
| 592 | } else |
| 593 | dst_hold(dst); |
| 594 | |
| 595 | if (tp->pmtu_cookie > dst_mtu(dst)) { |
| 596 | tcp_sync_mss(sk, dst_mtu(dst)); |
| 597 | tcp_simple_retransmit(sk); |
| 598 | } /* else let the usual retransmit timer handle it */ |
| 599 | dst_release(dst); |
| 600 | goto out; |
| 601 | } |
| 602 | |
| 603 | icmpv6_err_convert(type, code, &err); |
| 604 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 605 | /* Might be for an request_sock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | switch (sk->sk_state) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 607 | struct request_sock *req, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | case TCP_LISTEN: |
| 609 | if (sock_owned_by_user(sk)) |
| 610 | goto out; |
| 611 | |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame^] | 612 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
| 613 | &hdr->saddr, inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | if (!req) |
| 615 | goto out; |
| 616 | |
| 617 | /* ICMPs are not backlogged, hence we cannot get |
| 618 | * an established socket here. |
| 619 | */ |
| 620 | BUG_TRAP(req->sk == NULL); |
| 621 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 622 | if (seq != tcp_rsk(req)->snt_isn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
| 624 | goto out; |
| 625 | } |
| 626 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 627 | inet_csk_reqsk_queue_drop(sk, req, prev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | goto out; |
| 629 | |
| 630 | case TCP_SYN_SENT: |
| 631 | case TCP_SYN_RECV: /* Cannot happen. |
| 632 | It can, it SYNs are crossed. --ANK */ |
| 633 | if (!sock_owned_by_user(sk)) { |
| 634 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); |
| 635 | sk->sk_err = err; |
| 636 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ |
| 637 | |
| 638 | tcp_done(sk); |
| 639 | } else |
| 640 | sk->sk_err_soft = err; |
| 641 | goto out; |
| 642 | } |
| 643 | |
| 644 | if (!sock_owned_by_user(sk) && np->recverr) { |
| 645 | sk->sk_err = err; |
| 646 | sk->sk_error_report(sk); |
| 647 | } else |
| 648 | sk->sk_err_soft = err; |
| 649 | |
| 650 | out: |
| 651 | bh_unlock_sock(sk); |
| 652 | sock_put(sk); |
| 653 | } |
| 654 | |
| 655 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 656 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | struct dst_entry *dst) |
| 658 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 659 | struct tcp6_request_sock *treq = tcp6_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 661 | struct sk_buff * skb; |
| 662 | struct ipv6_txoptions *opt = NULL; |
| 663 | struct in6_addr * final_p = NULL, final; |
| 664 | struct flowi fl; |
| 665 | int err = -1; |
| 666 | |
| 667 | memset(&fl, 0, sizeof(fl)); |
| 668 | fl.proto = IPPROTO_TCP; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 669 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
| 670 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | fl.fl6_flowlabel = 0; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 672 | fl.oif = treq->iif; |
| 673 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | fl.fl_ip_sport = inet_sk(sk)->sport; |
| 675 | |
| 676 | if (dst == NULL) { |
| 677 | opt = np->opt; |
| 678 | if (opt == NULL && |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 679 | np->rxopt.bits.osrcrt == 2 && |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 680 | treq->pktopts) { |
| 681 | struct sk_buff *pktopts = treq->pktopts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | struct inet6_skb_parm *rxopt = IP6CB(pktopts); |
| 683 | if (rxopt->srcrt) |
| 684 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt)); |
| 685 | } |
| 686 | |
| 687 | if (opt && opt->srcrt) { |
| 688 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; |
| 689 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 690 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 691 | final_p = &final; |
| 692 | } |
| 693 | |
| 694 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 695 | if (err) |
| 696 | goto done; |
| 697 | if (final_p) |
| 698 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 699 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
| 700 | goto done; |
| 701 | } |
| 702 | |
| 703 | skb = tcp_make_synack(sk, dst, req); |
| 704 | if (skb) { |
| 705 | struct tcphdr *th = skb->h.th; |
| 706 | |
| 707 | th->check = tcp_v6_check(th, skb->len, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 708 | &treq->loc_addr, &treq->rmt_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | csum_partial((char *)th, skb->len, skb->csum)); |
| 710 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 711 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
| 713 | if (err == NET_XMIT_CN) |
| 714 | err = 0; |
| 715 | } |
| 716 | |
| 717 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | if (opt && opt != np->opt) |
| 719 | sock_kfree_s(sk, opt, opt->tot_len); |
| 720 | return err; |
| 721 | } |
| 722 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 723 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 725 | if (tcp6_rsk(req)->pktopts) |
| 726 | kfree_skb(tcp6_rsk(req)->pktopts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | } |
| 728 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 729 | static struct request_sock_ops tcp6_request_sock_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | .family = AF_INET6, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 731 | .obj_size = sizeof(struct tcp6_request_sock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | .rtx_syn_ack = tcp_v6_send_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 733 | .send_ack = tcp_v6_reqsk_send_ack, |
| 734 | .destructor = tcp_v6_reqsk_destructor, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | .send_reset = tcp_v6_send_reset |
| 736 | }; |
| 737 | |
| 738 | static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) |
| 739 | { |
| 740 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 741 | struct inet6_skb_parm *opt = IP6CB(skb); |
| 742 | |
| 743 | if (np->rxopt.all) { |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 744 | if ((opt->hop && (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || |
| 745 | ((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) && np->rxopt.bits.rxflow) || |
| 746 | (opt->srcrt && (np->rxopt.bits.srcrt || np->rxopt.bits.osrcrt)) || |
| 747 | ((opt->dst1 || opt->dst0) && (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | return 1; |
| 749 | } |
| 750 | return 0; |
| 751 | } |
| 752 | |
| 753 | |
| 754 | static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, |
| 755 | struct sk_buff *skb) |
| 756 | { |
| 757 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 758 | |
| 759 | if (skb->ip_summed == CHECKSUM_HW) { |
| 760 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
| 761 | skb->csum = offsetof(struct tcphdr, check); |
| 762 | } else { |
| 763 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
| 764 | csum_partial((char *)th, th->doff<<2, |
| 765 | skb->csum)); |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | |
| 770 | static void tcp_v6_send_reset(struct sk_buff *skb) |
| 771 | { |
| 772 | struct tcphdr *th = skb->h.th, *t1; |
| 773 | struct sk_buff *buff; |
| 774 | struct flowi fl; |
| 775 | |
| 776 | if (th->rst) |
| 777 | return; |
| 778 | |
| 779 | if (!ipv6_unicast_destination(skb)) |
| 780 | return; |
| 781 | |
| 782 | /* |
| 783 | * We need to grab some memory, and put together an RST, |
| 784 | * and then put it into the queue to be sent. |
| 785 | */ |
| 786 | |
| 787 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr), |
| 788 | GFP_ATOMIC); |
| 789 | if (buff == NULL) |
| 790 | return; |
| 791 | |
| 792 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr)); |
| 793 | |
| 794 | t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr)); |
| 795 | |
| 796 | /* Swap the send and the receive. */ |
| 797 | memset(t1, 0, sizeof(*t1)); |
| 798 | t1->dest = th->source; |
| 799 | t1->source = th->dest; |
| 800 | t1->doff = sizeof(*t1)/4; |
| 801 | t1->rst = 1; |
| 802 | |
| 803 | if(th->ack) { |
| 804 | t1->seq = th->ack_seq; |
| 805 | } else { |
| 806 | t1->ack = 1; |
| 807 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin |
| 808 | + skb->len - (th->doff<<2)); |
| 809 | } |
| 810 | |
| 811 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); |
| 812 | |
| 813 | memset(&fl, 0, sizeof(fl)); |
| 814 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); |
| 815 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); |
| 816 | |
| 817 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, |
| 818 | sizeof(*t1), IPPROTO_TCP, |
| 819 | buff->csum); |
| 820 | |
| 821 | fl.proto = IPPROTO_TCP; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 822 | fl.oif = inet6_iif(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | fl.fl_ip_dport = t1->dest; |
| 824 | fl.fl_ip_sport = t1->source; |
| 825 | |
| 826 | /* sk = NULL, but it is safe for now. RST socket required. */ |
| 827 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { |
| 828 | |
Arnaldo Carvalho de Melo | ecc51b6 | 2005-12-12 14:38:10 -0800 | [diff] [blame] | 829 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
| 830 | ip6_xmit(NULL, buff, &fl, NULL, 0); |
| 831 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
| 832 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | return; |
Arnaldo Carvalho de Melo | ecc51b6 | 2005-12-12 14:38:10 -0800 | [diff] [blame] | 834 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | } |
| 836 | |
| 837 | kfree_skb(buff); |
| 838 | } |
| 839 | |
| 840 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) |
| 841 | { |
| 842 | struct tcphdr *th = skb->h.th, *t1; |
| 843 | struct sk_buff *buff; |
| 844 | struct flowi fl; |
| 845 | int tot_len = sizeof(struct tcphdr); |
| 846 | |
| 847 | if (ts) |
| 848 | tot_len += 3*4; |
| 849 | |
| 850 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
| 851 | GFP_ATOMIC); |
| 852 | if (buff == NULL) |
| 853 | return; |
| 854 | |
| 855 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
| 856 | |
| 857 | t1 = (struct tcphdr *) skb_push(buff,tot_len); |
| 858 | |
| 859 | /* Swap the send and the receive. */ |
| 860 | memset(t1, 0, sizeof(*t1)); |
| 861 | t1->dest = th->source; |
| 862 | t1->source = th->dest; |
| 863 | t1->doff = tot_len/4; |
| 864 | t1->seq = htonl(seq); |
| 865 | t1->ack_seq = htonl(ack); |
| 866 | t1->ack = 1; |
| 867 | t1->window = htons(win); |
| 868 | |
| 869 | if (ts) { |
| 870 | u32 *ptr = (u32*)(t1 + 1); |
| 871 | *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 872 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); |
| 873 | *ptr++ = htonl(tcp_time_stamp); |
| 874 | *ptr = htonl(ts); |
| 875 | } |
| 876 | |
| 877 | buff->csum = csum_partial((char *)t1, tot_len, 0); |
| 878 | |
| 879 | memset(&fl, 0, sizeof(fl)); |
| 880 | ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr); |
| 881 | ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr); |
| 882 | |
| 883 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, |
| 884 | tot_len, IPPROTO_TCP, |
| 885 | buff->csum); |
| 886 | |
| 887 | fl.proto = IPPROTO_TCP; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 888 | fl.oif = inet6_iif(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | fl.fl_ip_dport = t1->dest; |
| 890 | fl.fl_ip_sport = t1->source; |
| 891 | |
| 892 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { |
Arnaldo Carvalho de Melo | ecc51b6 | 2005-12-12 14:38:10 -0800 | [diff] [blame] | 893 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
| 894 | ip6_xmit(NULL, buff, &fl, NULL, 0); |
| 895 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | return; |
Arnaldo Carvalho de Melo | ecc51b6 | 2005-12-12 14:38:10 -0800 | [diff] [blame] | 897 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | } |
| 899 | |
| 900 | kfree_skb(buff); |
| 901 | } |
| 902 | |
| 903 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 904 | { |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 905 | struct inet_timewait_sock *tw = inet_twsk(sk); |
| 906 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 908 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
| 909 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
| 910 | tcptw->tw_ts_recent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 912 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | } |
| 914 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 915 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 917 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | } |
| 919 | |
| 920 | |
| 921 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
| 922 | { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 923 | struct request_sock *req, **prev; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 924 | const struct tcphdr *th = skb->h.th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | struct sock *nsk; |
| 926 | |
| 927 | /* Find possible connection requests. */ |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame^] | 928 | req = inet6_csk_search_req(sk, &prev, th->source, |
| 929 | &skb->nh.ipv6h->saddr, |
| 930 | &skb->nh.ipv6h->daddr, inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | if (req) |
| 932 | return tcp_check_req(sk, skb, req, prev); |
| 933 | |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 934 | nsk = __inet6_lookup_established(&tcp_hashinfo, &skb->nh.ipv6h->saddr, |
| 935 | th->source, &skb->nh.ipv6h->daddr, |
| 936 | ntohs(th->dest), inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | |
| 938 | if (nsk) { |
| 939 | if (nsk->sk_state != TCP_TIME_WAIT) { |
| 940 | bh_lock_sock(nsk); |
| 941 | return nsk; |
| 942 | } |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 943 | inet_twsk_put((struct inet_timewait_sock *)nsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | return NULL; |
| 945 | } |
| 946 | |
| 947 | #if 0 /*def CONFIG_SYN_COOKIES*/ |
| 948 | if (!th->rst && !th->syn && th->ack) |
| 949 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); |
| 950 | #endif |
| 951 | return sk; |
| 952 | } |
| 953 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | /* FIXME: this is substantially similar to the ipv4 code. |
| 955 | * Can some kind of merge be done? -- erics |
| 956 | */ |
| 957 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
| 958 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 959 | struct tcp6_request_sock *treq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 961 | struct tcp_options_received tmp_opt; |
| 962 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 963 | struct request_sock *req = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | __u32 isn = TCP_SKB_CB(skb)->when; |
| 965 | |
| 966 | if (skb->protocol == htons(ETH_P_IP)) |
| 967 | return tcp_v4_conn_request(sk, skb); |
| 968 | |
| 969 | if (!ipv6_unicast_destination(skb)) |
| 970 | goto drop; |
| 971 | |
| 972 | /* |
| 973 | * There are no SYN attacks on IPv6, yet... |
| 974 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 975 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | if (net_ratelimit()) |
| 977 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); |
| 978 | goto drop; |
| 979 | } |
| 980 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 981 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | goto drop; |
| 983 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 984 | req = reqsk_alloc(&tcp6_request_sock_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | if (req == NULL) |
| 986 | goto drop; |
| 987 | |
| 988 | tcp_clear_options(&tmp_opt); |
| 989 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| 990 | tmp_opt.user_mss = tp->rx_opt.user_mss; |
| 991 | |
| 992 | tcp_parse_options(skb, &tmp_opt, 0); |
| 993 | |
| 994 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
| 995 | tcp_openreq_init(req, &tmp_opt, skb); |
| 996 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 997 | treq = tcp6_rsk(req); |
| 998 | ipv6_addr_copy(&treq->rmt_addr, &skb->nh.ipv6h->saddr); |
| 999 | ipv6_addr_copy(&treq->loc_addr, &skb->nh.ipv6h->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | TCP_ECN_create_request(req, skb->h.th); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1001 | treq->pktopts = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | if (ipv6_opt_accepted(sk, skb) || |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1003 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
| 1004 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | atomic_inc(&skb->users); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1006 | treq->pktopts = skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1008 | treq->iif = sk->sk_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | |
| 1010 | /* So that link locals have meaning */ |
| 1011 | if (!sk->sk_bound_dev_if && |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1012 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1013 | treq->iif = inet6_iif(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
| 1015 | if (isn == 0) |
| 1016 | isn = tcp_v6_init_sequence(sk,skb); |
| 1017 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1018 | tcp_rsk(req)->snt_isn = isn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
| 1020 | if (tcp_v6_send_synack(sk, req, NULL)) |
| 1021 | goto drop; |
| 1022 | |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame^] | 1023 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | return 0; |
| 1025 | |
| 1026 | drop: |
| 1027 | if (req) |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1028 | reqsk_free(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
| 1030 | TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS); |
| 1031 | return 0; /* don't send reset */ |
| 1032 | } |
| 1033 | |
| 1034 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1035 | struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | struct dst_entry *dst) |
| 1037 | { |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1038 | struct tcp6_request_sock *treq = tcp6_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
| 1040 | struct tcp6_sock *newtcp6sk; |
| 1041 | struct inet_sock *newinet; |
| 1042 | struct tcp_sock *newtp; |
| 1043 | struct sock *newsk; |
| 1044 | struct ipv6_txoptions *opt; |
| 1045 | |
| 1046 | if (skb->protocol == htons(ETH_P_IP)) { |
| 1047 | /* |
| 1048 | * v6 mapped |
| 1049 | */ |
| 1050 | |
| 1051 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); |
| 1052 | |
| 1053 | if (newsk == NULL) |
| 1054 | return NULL; |
| 1055 | |
| 1056 | newtcp6sk = (struct tcp6_sock *)newsk; |
| 1057 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| 1058 | |
| 1059 | newinet = inet_sk(newsk); |
| 1060 | newnp = inet6_sk(newsk); |
| 1061 | newtp = tcp_sk(newsk); |
| 1062 | |
| 1063 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 1064 | |
| 1065 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), |
| 1066 | newinet->daddr); |
| 1067 | |
| 1068 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), |
| 1069 | newinet->saddr); |
| 1070 | |
| 1071 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); |
| 1072 | |
| 1073 | newtp->af_specific = &ipv6_mapped; |
| 1074 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
| 1075 | newnp->pktoptions = NULL; |
| 1076 | newnp->opt = NULL; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1077 | newnp->mcast_oif = inet6_iif(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
| 1079 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1080 | /* |
| 1081 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count |
| 1082 | * here, tcp_create_openreq_child now does this for us, see the comment in |
| 1083 | * that function for the gory details. -acme |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | |
| 1086 | /* It is tricky place. Until this moment IPv4 tcp |
| 1087 | worked with IPv6 af_tcp.af_specific. |
| 1088 | Sync it now. |
| 1089 | */ |
| 1090 | tcp_sync_mss(newsk, newtp->pmtu_cookie); |
| 1091 | |
| 1092 | return newsk; |
| 1093 | } |
| 1094 | |
| 1095 | opt = np->opt; |
| 1096 | |
| 1097 | if (sk_acceptq_is_full(sk)) |
| 1098 | goto out_overflow; |
| 1099 | |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1100 | if (np->rxopt.bits.osrcrt == 2 && |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1101 | opt == NULL && treq->pktopts) { |
| 1102 | struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | if (rxopt->srcrt) |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1104 | opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr *)(treq->pktopts->nh.raw + rxopt->srcrt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | } |
| 1106 | |
| 1107 | if (dst == NULL) { |
| 1108 | struct in6_addr *final_p = NULL, final; |
| 1109 | struct flowi fl; |
| 1110 | |
| 1111 | memset(&fl, 0, sizeof(fl)); |
| 1112 | fl.proto = IPPROTO_TCP; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1113 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | if (opt && opt->srcrt) { |
| 1115 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; |
| 1116 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 1117 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 1118 | final_p = &final; |
| 1119 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1120 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | fl.oif = sk->sk_bound_dev_if; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1122 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | fl.fl_ip_sport = inet_sk(sk)->sport; |
| 1124 | |
| 1125 | if (ip6_dst_lookup(sk, &dst, &fl)) |
| 1126 | goto out; |
| 1127 | |
| 1128 | if (final_p) |
| 1129 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 1130 | |
| 1131 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
| 1132 | goto out; |
| 1133 | } |
| 1134 | |
| 1135 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1136 | if (newsk == NULL) |
| 1137 | goto out; |
| 1138 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1139 | /* |
| 1140 | * No need to charge this sock to the relevant IPv6 refcnt debug socks |
| 1141 | * count here, tcp_create_openreq_child now does this for us, see the |
| 1142 | * comment in that function for the gory details. -acme |
| 1143 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
| 1145 | ip6_dst_store(newsk, dst, NULL); |
| 1146 | newsk->sk_route_caps = dst->dev->features & |
| 1147 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); |
| 1148 | |
| 1149 | newtcp6sk = (struct tcp6_sock *)newsk; |
| 1150 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| 1151 | |
| 1152 | newtp = tcp_sk(newsk); |
| 1153 | newinet = inet_sk(newsk); |
| 1154 | newnp = inet6_sk(newsk); |
| 1155 | |
| 1156 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 1157 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1158 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
| 1159 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); |
| 1160 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); |
| 1161 | newsk->sk_bound_dev_if = treq->iif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | |
| 1163 | /* Now IPv6 options... |
| 1164 | |
| 1165 | First: no IPv4 options. |
| 1166 | */ |
| 1167 | newinet->opt = NULL; |
| 1168 | |
| 1169 | /* Clone RX bits */ |
| 1170 | newnp->rxopt.all = np->rxopt.all; |
| 1171 | |
| 1172 | /* Clone pktoptions received with SYN */ |
| 1173 | newnp->pktoptions = NULL; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1174 | if (treq->pktopts != NULL) { |
| 1175 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); |
| 1176 | kfree_skb(treq->pktopts); |
| 1177 | treq->pktopts = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | if (newnp->pktoptions) |
| 1179 | skb_set_owner_r(newnp->pktoptions, newsk); |
| 1180 | } |
| 1181 | newnp->opt = NULL; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1182 | newnp->mcast_oif = inet6_iif(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | newnp->mcast_hops = skb->nh.ipv6h->hop_limit; |
| 1184 | |
| 1185 | /* Clone native IPv6 options from listening socket (if any) |
| 1186 | |
| 1187 | Yes, keeping reference count would be much more clever, |
| 1188 | but we make one more one thing there: reattach optmem |
| 1189 | to newsk. |
| 1190 | */ |
| 1191 | if (opt) { |
| 1192 | newnp->opt = ipv6_dup_options(newsk, opt); |
| 1193 | if (opt != np->opt) |
| 1194 | sock_kfree_s(sk, opt, opt->tot_len); |
| 1195 | } |
| 1196 | |
| 1197 | newtp->ext_header_len = 0; |
| 1198 | if (newnp->opt) |
| 1199 | newtp->ext_header_len = newnp->opt->opt_nflen + |
| 1200 | newnp->opt->opt_flen; |
| 1201 | |
| 1202 | tcp_sync_mss(newsk, dst_mtu(dst)); |
| 1203 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); |
| 1204 | tcp_initialize_rcv_mss(newsk); |
| 1205 | |
| 1206 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; |
| 1207 | |
Arnaldo Carvalho de Melo | 90b19d3 | 2005-12-13 23:15:01 -0800 | [diff] [blame] | 1208 | __inet6_hash(&tcp_hashinfo, newsk); |
Arnaldo Carvalho de Melo | 2d8c4ce | 2005-08-09 20:07:13 -0700 | [diff] [blame] | 1209 | inet_inherit_port(&tcp_hashinfo, sk, newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | |
| 1211 | return newsk; |
| 1212 | |
| 1213 | out_overflow: |
| 1214 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); |
| 1215 | out: |
| 1216 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); |
| 1217 | if (opt && opt != np->opt) |
| 1218 | sock_kfree_s(sk, opt, opt->tot_len); |
| 1219 | dst_release(dst); |
| 1220 | return NULL; |
| 1221 | } |
| 1222 | |
| 1223 | static int tcp_v6_checksum_init(struct sk_buff *skb) |
| 1224 | { |
| 1225 | if (skb->ip_summed == CHECKSUM_HW) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1227 | &skb->nh.ipv6h->daddr,skb->csum)) { |
| 1228 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | return 0; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1230 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | } |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1232 | |
| 1233 | skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr, |
| 1234 | &skb->nh.ipv6h->daddr, 0); |
| 1235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | if (skb->len <= 76) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1237 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | } |
| 1239 | return 0; |
| 1240 | } |
| 1241 | |
| 1242 | /* The socket must have it's spinlock held when we get |
| 1243 | * here. |
| 1244 | * |
| 1245 | * We have a potential double-lock case here, so even when |
| 1246 | * doing backlog processing we use the BH locking scheme. |
| 1247 | * This is because we cannot sleep with the original spinlock |
| 1248 | * held. |
| 1249 | */ |
| 1250 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1251 | { |
| 1252 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1253 | struct tcp_sock *tp; |
| 1254 | struct sk_buff *opt_skb = NULL; |
| 1255 | |
| 1256 | /* Imagine: socket is IPv6. IPv4 packet arrives, |
| 1257 | goes to IPv4 receive handler and backlogged. |
| 1258 | From backlog it always goes here. Kerboom... |
| 1259 | Fortunately, tcp_rcv_established and rcv_established |
| 1260 | handle them correctly, but it is not case with |
| 1261 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK |
| 1262 | */ |
| 1263 | |
| 1264 | if (skb->protocol == htons(ETH_P_IP)) |
| 1265 | return tcp_v4_do_rcv(sk, skb); |
| 1266 | |
| 1267 | if (sk_filter(sk, skb, 0)) |
| 1268 | goto discard; |
| 1269 | |
| 1270 | /* |
| 1271 | * socket locking is here for SMP purposes as backlog rcv |
| 1272 | * is currently called with bh processing disabled. |
| 1273 | */ |
| 1274 | |
| 1275 | /* Do Stevens' IPV6_PKTOPTIONS. |
| 1276 | |
| 1277 | Yes, guys, it is the only place in our code, where we |
| 1278 | may make it not affecting IPv4. |
| 1279 | The rest of code is protocol independent, |
| 1280 | and I do not like idea to uglify IPv4. |
| 1281 | |
| 1282 | Actually, all the idea behind IPV6_PKTOPTIONS |
| 1283 | looks not very well thought. For now we latch |
| 1284 | options, received in the last packet, enqueued |
| 1285 | by tcp. Feel free to propose better solution. |
| 1286 | --ANK (980728) |
| 1287 | */ |
| 1288 | if (np->rxopt.all) |
| 1289 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
| 1290 | |
| 1291 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
| 1292 | TCP_CHECK_TIMER(sk); |
| 1293 | if (tcp_rcv_established(sk, skb, skb->h.th, skb->len)) |
| 1294 | goto reset; |
| 1295 | TCP_CHECK_TIMER(sk); |
| 1296 | if (opt_skb) |
| 1297 | goto ipv6_pktoptions; |
| 1298 | return 0; |
| 1299 | } |
| 1300 | |
| 1301 | if (skb->len < (skb->h.th->doff<<2) || tcp_checksum_complete(skb)) |
| 1302 | goto csum_err; |
| 1303 | |
| 1304 | if (sk->sk_state == TCP_LISTEN) { |
| 1305 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
| 1306 | if (!nsk) |
| 1307 | goto discard; |
| 1308 | |
| 1309 | /* |
| 1310 | * Queue it on the new socket if the new socket is active, |
| 1311 | * otherwise we just shortcircuit this and continue with |
| 1312 | * the new socket.. |
| 1313 | */ |
| 1314 | if(nsk != sk) { |
| 1315 | if (tcp_child_process(sk, nsk, skb)) |
| 1316 | goto reset; |
| 1317 | if (opt_skb) |
| 1318 | __kfree_skb(opt_skb); |
| 1319 | return 0; |
| 1320 | } |
| 1321 | } |
| 1322 | |
| 1323 | TCP_CHECK_TIMER(sk); |
| 1324 | if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len)) |
| 1325 | goto reset; |
| 1326 | TCP_CHECK_TIMER(sk); |
| 1327 | if (opt_skb) |
| 1328 | goto ipv6_pktoptions; |
| 1329 | return 0; |
| 1330 | |
| 1331 | reset: |
| 1332 | tcp_v6_send_reset(skb); |
| 1333 | discard: |
| 1334 | if (opt_skb) |
| 1335 | __kfree_skb(opt_skb); |
| 1336 | kfree_skb(skb); |
| 1337 | return 0; |
| 1338 | csum_err: |
| 1339 | TCP_INC_STATS_BH(TCP_MIB_INERRS); |
| 1340 | goto discard; |
| 1341 | |
| 1342 | |
| 1343 | ipv6_pktoptions: |
| 1344 | /* Do you ask, what is it? |
| 1345 | |
| 1346 | 1. skb was enqueued by tcp. |
| 1347 | 2. skb is added to tail of read queue, rather than out of order. |
| 1348 | 3. socket is not in passive state. |
| 1349 | 4. Finally, it really contains options, which user wants to receive. |
| 1350 | */ |
| 1351 | tp = tcp_sk(sk); |
| 1352 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && |
| 1353 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1354 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1355 | np->mcast_oif = inet6_iif(opt_skb); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1356 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | np->mcast_hops = opt_skb->nh.ipv6h->hop_limit; |
| 1358 | if (ipv6_opt_accepted(sk, opt_skb)) { |
| 1359 | skb_set_owner_r(opt_skb, sk); |
| 1360 | opt_skb = xchg(&np->pktoptions, opt_skb); |
| 1361 | } else { |
| 1362 | __kfree_skb(opt_skb); |
| 1363 | opt_skb = xchg(&np->pktoptions, NULL); |
| 1364 | } |
| 1365 | } |
| 1366 | |
| 1367 | if (opt_skb) |
| 1368 | kfree_skb(opt_skb); |
| 1369 | return 0; |
| 1370 | } |
| 1371 | |
| 1372 | static int tcp_v6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) |
| 1373 | { |
| 1374 | struct sk_buff *skb = *pskb; |
| 1375 | struct tcphdr *th; |
| 1376 | struct sock *sk; |
| 1377 | int ret; |
| 1378 | |
| 1379 | if (skb->pkt_type != PACKET_HOST) |
| 1380 | goto discard_it; |
| 1381 | |
| 1382 | /* |
| 1383 | * Count it even if it's bad. |
| 1384 | */ |
| 1385 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); |
| 1386 | |
| 1387 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1388 | goto discard_it; |
| 1389 | |
| 1390 | th = skb->h.th; |
| 1391 | |
| 1392 | if (th->doff < sizeof(struct tcphdr)/4) |
| 1393 | goto bad_packet; |
| 1394 | if (!pskb_may_pull(skb, th->doff*4)) |
| 1395 | goto discard_it; |
| 1396 | |
| 1397 | if ((skb->ip_summed != CHECKSUM_UNNECESSARY && |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1398 | tcp_v6_checksum_init(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | goto bad_packet; |
| 1400 | |
| 1401 | th = skb->h.th; |
| 1402 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1403 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1404 | skb->len - th->doff*4); |
| 1405 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
| 1406 | TCP_SKB_CB(skb)->when = 0; |
| 1407 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(skb->nh.ipv6h); |
| 1408 | TCP_SKB_CB(skb)->sacked = 0; |
| 1409 | |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1410 | sk = __inet6_lookup(&tcp_hashinfo, &skb->nh.ipv6h->saddr, th->source, |
| 1411 | &skb->nh.ipv6h->daddr, ntohs(th->dest), |
| 1412 | inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | |
| 1414 | if (!sk) |
| 1415 | goto no_tcp_socket; |
| 1416 | |
| 1417 | process: |
| 1418 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1419 | goto do_time_wait; |
| 1420 | |
| 1421 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1422 | goto discard_and_relse; |
| 1423 | |
| 1424 | if (sk_filter(sk, skb, 0)) |
| 1425 | goto discard_and_relse; |
| 1426 | |
| 1427 | skb->dev = NULL; |
| 1428 | |
| 1429 | bh_lock_sock(sk); |
| 1430 | ret = 0; |
| 1431 | if (!sock_owned_by_user(sk)) { |
| 1432 | if (!tcp_prequeue(sk, skb)) |
| 1433 | ret = tcp_v6_do_rcv(sk, skb); |
| 1434 | } else |
| 1435 | sk_add_backlog(sk, skb); |
| 1436 | bh_unlock_sock(sk); |
| 1437 | |
| 1438 | sock_put(sk); |
| 1439 | return ret ? -1 : 0; |
| 1440 | |
| 1441 | no_tcp_socket: |
| 1442 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1443 | goto discard_it; |
| 1444 | |
| 1445 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
| 1446 | bad_packet: |
| 1447 | TCP_INC_STATS_BH(TCP_MIB_INERRS); |
| 1448 | } else { |
| 1449 | tcp_v6_send_reset(skb); |
| 1450 | } |
| 1451 | |
| 1452 | discard_it: |
| 1453 | |
| 1454 | /* |
| 1455 | * Discard frame |
| 1456 | */ |
| 1457 | |
| 1458 | kfree_skb(skb); |
| 1459 | return 0; |
| 1460 | |
| 1461 | discard_and_relse: |
| 1462 | sock_put(sk); |
| 1463 | goto discard_it; |
| 1464 | |
| 1465 | do_time_wait: |
| 1466 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1467 | inet_twsk_put((struct inet_timewait_sock *)sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | goto discard_it; |
| 1469 | } |
| 1470 | |
| 1471 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
| 1472 | TCP_INC_STATS_BH(TCP_MIB_INERRS); |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1473 | inet_twsk_put((struct inet_timewait_sock *)sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | goto discard_it; |
| 1475 | } |
| 1476 | |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1477 | switch (tcp_timewait_state_process((struct inet_timewait_sock *)sk, |
| 1478 | skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | case TCP_TW_SYN: |
| 1480 | { |
| 1481 | struct sock *sk2; |
| 1482 | |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1483 | sk2 = inet6_lookup_listener(&tcp_hashinfo, |
| 1484 | &skb->nh.ipv6h->daddr, |
| 1485 | ntohs(th->dest), inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | if (sk2 != NULL) { |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 1487 | struct inet_timewait_sock *tw = inet_twsk(sk); |
| 1488 | inet_twsk_deschedule(tw, &tcp_death_row); |
| 1489 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | sk = sk2; |
| 1491 | goto process; |
| 1492 | } |
| 1493 | /* Fall through to ACK */ |
| 1494 | } |
| 1495 | case TCP_TW_ACK: |
| 1496 | tcp_v6_timewait_ack(sk, skb); |
| 1497 | break; |
| 1498 | case TCP_TW_RST: |
| 1499 | goto no_tcp_socket; |
| 1500 | case TCP_TW_SUCCESS:; |
| 1501 | } |
| 1502 | goto discard_it; |
| 1503 | } |
| 1504 | |
| 1505 | static int tcp_v6_rebuild_header(struct sock *sk) |
| 1506 | { |
| 1507 | int err; |
| 1508 | struct dst_entry *dst; |
| 1509 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1510 | |
| 1511 | dst = __sk_dst_check(sk, np->dst_cookie); |
| 1512 | |
| 1513 | if (dst == NULL) { |
| 1514 | struct inet_sock *inet = inet_sk(sk); |
| 1515 | struct in6_addr *final_p = NULL, final; |
| 1516 | struct flowi fl; |
| 1517 | |
| 1518 | memset(&fl, 0, sizeof(fl)); |
| 1519 | fl.proto = IPPROTO_TCP; |
| 1520 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 1521 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| 1522 | fl.fl6_flowlabel = np->flow_label; |
| 1523 | fl.oif = sk->sk_bound_dev_if; |
| 1524 | fl.fl_ip_dport = inet->dport; |
| 1525 | fl.fl_ip_sport = inet->sport; |
| 1526 | |
| 1527 | if (np->opt && np->opt->srcrt) { |
| 1528 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; |
| 1529 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 1530 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 1531 | final_p = &final; |
| 1532 | } |
| 1533 | |
| 1534 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 1535 | if (err) { |
| 1536 | sk->sk_route_caps = 0; |
| 1537 | return err; |
| 1538 | } |
| 1539 | if (final_p) |
| 1540 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 1541 | |
| 1542 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { |
| 1543 | sk->sk_err_soft = -err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | return err; |
| 1545 | } |
| 1546 | |
| 1547 | ip6_dst_store(sk, dst, NULL); |
| 1548 | sk->sk_route_caps = dst->dev->features & |
| 1549 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); |
| 1550 | } |
| 1551 | |
| 1552 | return 0; |
| 1553 | } |
| 1554 | |
| 1555 | static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok) |
| 1556 | { |
| 1557 | struct sock *sk = skb->sk; |
| 1558 | struct inet_sock *inet = inet_sk(sk); |
| 1559 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1560 | struct flowi fl; |
| 1561 | struct dst_entry *dst; |
| 1562 | struct in6_addr *final_p = NULL, final; |
| 1563 | |
| 1564 | memset(&fl, 0, sizeof(fl)); |
| 1565 | fl.proto = IPPROTO_TCP; |
| 1566 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 1567 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| 1568 | fl.fl6_flowlabel = np->flow_label; |
| 1569 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); |
| 1570 | fl.oif = sk->sk_bound_dev_if; |
| 1571 | fl.fl_ip_sport = inet->sport; |
| 1572 | fl.fl_ip_dport = inet->dport; |
| 1573 | |
| 1574 | if (np->opt && np->opt->srcrt) { |
| 1575 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; |
| 1576 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 1577 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 1578 | final_p = &final; |
| 1579 | } |
| 1580 | |
| 1581 | dst = __sk_dst_check(sk, np->dst_cookie); |
| 1582 | |
| 1583 | if (dst == NULL) { |
| 1584 | int err = ip6_dst_lookup(sk, &dst, &fl); |
| 1585 | |
| 1586 | if (err) { |
| 1587 | sk->sk_err_soft = -err; |
| 1588 | return err; |
| 1589 | } |
| 1590 | |
| 1591 | if (final_p) |
| 1592 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 1593 | |
| 1594 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { |
| 1595 | sk->sk_route_caps = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | return err; |
| 1597 | } |
| 1598 | |
| 1599 | ip6_dst_store(sk, dst, NULL); |
| 1600 | sk->sk_route_caps = dst->dev->features & |
| 1601 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); |
| 1602 | } |
| 1603 | |
| 1604 | skb->dst = dst_clone(dst); |
| 1605 | |
| 1606 | /* Restore final destination back after routing done */ |
| 1607 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 1608 | |
| 1609 | return ip6_xmit(sk, skb, &fl, np->opt, 0); |
| 1610 | } |
| 1611 | |
| 1612 | static void v6_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) |
| 1613 | { |
| 1614 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1615 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; |
| 1616 | |
| 1617 | sin6->sin6_family = AF_INET6; |
| 1618 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); |
| 1619 | sin6->sin6_port = inet_sk(sk)->dport; |
| 1620 | /* We do not store received flowlabel for TCP */ |
| 1621 | sin6->sin6_flowinfo = 0; |
| 1622 | sin6->sin6_scope_id = 0; |
| 1623 | if (sk->sk_bound_dev_if && |
| 1624 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| 1625 | sin6->sin6_scope_id = sk->sk_bound_dev_if; |
| 1626 | } |
| 1627 | |
| 1628 | static int tcp_v6_remember_stamp(struct sock *sk) |
| 1629 | { |
| 1630 | /* Alas, not yet... */ |
| 1631 | return 0; |
| 1632 | } |
| 1633 | |
| 1634 | static struct tcp_func ipv6_specific = { |
| 1635 | .queue_xmit = tcp_v6_xmit, |
| 1636 | .send_check = tcp_v6_send_check, |
| 1637 | .rebuild_header = tcp_v6_rebuild_header, |
| 1638 | .conn_request = tcp_v6_conn_request, |
| 1639 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
| 1640 | .remember_stamp = tcp_v6_remember_stamp, |
| 1641 | .net_header_len = sizeof(struct ipv6hdr), |
| 1642 | |
| 1643 | .setsockopt = ipv6_setsockopt, |
| 1644 | .getsockopt = ipv6_getsockopt, |
| 1645 | .addr2sockaddr = v6_addr2sockaddr, |
| 1646 | .sockaddr_len = sizeof(struct sockaddr_in6) |
| 1647 | }; |
| 1648 | |
| 1649 | /* |
| 1650 | * TCP over IPv4 via INET6 API |
| 1651 | */ |
| 1652 | |
| 1653 | static struct tcp_func ipv6_mapped = { |
| 1654 | .queue_xmit = ip_queue_xmit, |
| 1655 | .send_check = tcp_v4_send_check, |
Arnaldo Carvalho de Melo | 32519f1 | 2005-08-09 19:50:02 -0700 | [diff] [blame] | 1656 | .rebuild_header = inet_sk_rebuild_header, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | .conn_request = tcp_v6_conn_request, |
| 1658 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
| 1659 | .remember_stamp = tcp_v4_remember_stamp, |
| 1660 | .net_header_len = sizeof(struct iphdr), |
| 1661 | |
| 1662 | .setsockopt = ipv6_setsockopt, |
| 1663 | .getsockopt = ipv6_getsockopt, |
| 1664 | .addr2sockaddr = v6_addr2sockaddr, |
| 1665 | .sockaddr_len = sizeof(struct sockaddr_in6) |
| 1666 | }; |
| 1667 | |
| 1668 | |
| 1669 | |
| 1670 | /* NOTE: A lot of things set to zero explicitly by call to |
| 1671 | * sk_alloc() so need not be done here. |
| 1672 | */ |
| 1673 | static int tcp_v6_init_sock(struct sock *sk) |
| 1674 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1675 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | struct tcp_sock *tp = tcp_sk(sk); |
| 1677 | |
| 1678 | skb_queue_head_init(&tp->out_of_order_queue); |
| 1679 | tcp_init_xmit_timers(sk); |
| 1680 | tcp_prequeue_init(tp); |
| 1681 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1682 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | tp->mdev = TCP_TIMEOUT_INIT; |
| 1684 | |
| 1685 | /* So many TCP implementations out there (incorrectly) count the |
| 1686 | * initial SYN frame in their delayed-ACK and congestion control |
| 1687 | * algorithms that we must have the following bandaid to talk |
| 1688 | * efficiently to them. -DaveM |
| 1689 | */ |
| 1690 | tp->snd_cwnd = 2; |
| 1691 | |
| 1692 | /* See draft-stevens-tcpca-spec-01 for discussion of the |
| 1693 | * initialization of these values. |
| 1694 | */ |
| 1695 | tp->snd_ssthresh = 0x7fffffff; |
| 1696 | tp->snd_cwnd_clamp = ~0; |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 1697 | tp->mss_cache = 536; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | |
| 1699 | tp->reordering = sysctl_tcp_reordering; |
| 1700 | |
| 1701 | sk->sk_state = TCP_CLOSE; |
| 1702 | |
| 1703 | tp->af_specific = &ipv6_specific; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1704 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | sk->sk_write_space = sk_stream_write_space; |
| 1706 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); |
| 1707 | |
| 1708 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
| 1709 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; |
| 1710 | |
| 1711 | atomic_inc(&tcp_sockets_allocated); |
| 1712 | |
| 1713 | return 0; |
| 1714 | } |
| 1715 | |
| 1716 | static int tcp_v6_destroy_sock(struct sock *sk) |
| 1717 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | tcp_v4_destroy_sock(sk); |
| 1719 | return inet6_destroy_sock(sk); |
| 1720 | } |
| 1721 | |
| 1722 | /* Proc filesystem TCPv6 sock list dumping. */ |
| 1723 | static void get_openreq6(struct seq_file *seq, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1724 | struct sock *sk, struct request_sock *req, int i, int uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | { |
| 1726 | struct in6_addr *dest, *src; |
| 1727 | int ttd = req->expires - jiffies; |
| 1728 | |
| 1729 | if (ttd < 0) |
| 1730 | ttd = 0; |
| 1731 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1732 | src = &tcp6_rsk(req)->loc_addr; |
| 1733 | dest = &tcp6_rsk(req)->rmt_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | seq_printf(seq, |
| 1735 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| 1736 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", |
| 1737 | i, |
| 1738 | src->s6_addr32[0], src->s6_addr32[1], |
| 1739 | src->s6_addr32[2], src->s6_addr32[3], |
| 1740 | ntohs(inet_sk(sk)->sport), |
| 1741 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1742 | dest->s6_addr32[2], dest->s6_addr32[3], |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1743 | ntohs(inet_rsk(req)->rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | TCP_SYN_RECV, |
| 1745 | 0,0, /* could print option size, but that is af dependent. */ |
| 1746 | 1, /* timers active (only the expire timer) */ |
| 1747 | jiffies_to_clock_t(ttd), |
| 1748 | req->retrans, |
| 1749 | uid, |
| 1750 | 0, /* non standard timer */ |
| 1751 | 0, /* open_requests have no inode */ |
| 1752 | 0, req); |
| 1753 | } |
| 1754 | |
| 1755 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) |
| 1756 | { |
| 1757 | struct in6_addr *dest, *src; |
| 1758 | __u16 destp, srcp; |
| 1759 | int timer_active; |
| 1760 | unsigned long timer_expires; |
| 1761 | struct inet_sock *inet = inet_sk(sp); |
| 1762 | struct tcp_sock *tp = tcp_sk(sp); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1763 | const struct inet_connection_sock *icsk = inet_csk(sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | struct ipv6_pinfo *np = inet6_sk(sp); |
| 1765 | |
| 1766 | dest = &np->daddr; |
| 1767 | src = &np->rcv_saddr; |
| 1768 | destp = ntohs(inet->dport); |
| 1769 | srcp = ntohs(inet->sport); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1770 | |
| 1771 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1773 | timer_expires = icsk->icsk_timeout; |
| 1774 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1776 | timer_expires = icsk->icsk_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | } else if (timer_pending(&sp->sk_timer)) { |
| 1778 | timer_active = 2; |
| 1779 | timer_expires = sp->sk_timer.expires; |
| 1780 | } else { |
| 1781 | timer_active = 0; |
| 1782 | timer_expires = jiffies; |
| 1783 | } |
| 1784 | |
| 1785 | seq_printf(seq, |
| 1786 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| 1787 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", |
| 1788 | i, |
| 1789 | src->s6_addr32[0], src->s6_addr32[1], |
| 1790 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 1791 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1792 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
| 1793 | sp->sk_state, |
| 1794 | tp->write_seq-tp->snd_una, tp->rcv_nxt-tp->copied_seq, |
| 1795 | timer_active, |
| 1796 | jiffies_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1797 | icsk->icsk_retransmits, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1798 | sock_i_uid(sp), |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1799 | icsk->icsk_probes_out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | sock_i_ino(sp), |
| 1801 | atomic_read(&sp->sk_refcnt), sp, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1802 | icsk->icsk_rto, |
| 1803 | icsk->icsk_ack.ato, |
| 1804 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
| 1806 | ); |
| 1807 | } |
| 1808 | |
| 1809 | static void get_timewait6_sock(struct seq_file *seq, |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1810 | struct inet_timewait_sock *tw, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | { |
| 1812 | struct in6_addr *dest, *src; |
| 1813 | __u16 destp, srcp; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1814 | struct tcp6_timewait_sock *tcp6tw = tcp6_twsk((struct sock *)tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | int ttd = tw->tw_ttd - jiffies; |
| 1816 | |
| 1817 | if (ttd < 0) |
| 1818 | ttd = 0; |
| 1819 | |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1820 | dest = &tcp6tw->tw_v6_daddr; |
| 1821 | src = &tcp6tw->tw_v6_rcv_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | destp = ntohs(tw->tw_dport); |
| 1823 | srcp = ntohs(tw->tw_sport); |
| 1824 | |
| 1825 | seq_printf(seq, |
| 1826 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| 1827 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", |
| 1828 | i, |
| 1829 | src->s6_addr32[0], src->s6_addr32[1], |
| 1830 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 1831 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1832 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
| 1833 | tw->tw_substate, 0, 0, |
| 1834 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, |
| 1835 | atomic_read(&tw->tw_refcnt), tw); |
| 1836 | } |
| 1837 | |
| 1838 | #ifdef CONFIG_PROC_FS |
| 1839 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
| 1840 | { |
| 1841 | struct tcp_iter_state *st; |
| 1842 | |
| 1843 | if (v == SEQ_START_TOKEN) { |
| 1844 | seq_puts(seq, |
| 1845 | " sl " |
| 1846 | "local_address " |
| 1847 | "remote_address " |
| 1848 | "st tx_queue rx_queue tr tm->when retrnsmt" |
| 1849 | " uid timeout inode\n"); |
| 1850 | goto out; |
| 1851 | } |
| 1852 | st = seq->private; |
| 1853 | |
| 1854 | switch (st->state) { |
| 1855 | case TCP_SEQ_STATE_LISTENING: |
| 1856 | case TCP_SEQ_STATE_ESTABLISHED: |
| 1857 | get_tcp6_sock(seq, v, st->num); |
| 1858 | break; |
| 1859 | case TCP_SEQ_STATE_OPENREQ: |
| 1860 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); |
| 1861 | break; |
| 1862 | case TCP_SEQ_STATE_TIME_WAIT: |
| 1863 | get_timewait6_sock(seq, v, st->num); |
| 1864 | break; |
| 1865 | } |
| 1866 | out: |
| 1867 | return 0; |
| 1868 | } |
| 1869 | |
| 1870 | static struct file_operations tcp6_seq_fops; |
| 1871 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
| 1872 | .owner = THIS_MODULE, |
| 1873 | .name = "tcp6", |
| 1874 | .family = AF_INET6, |
| 1875 | .seq_show = tcp6_seq_show, |
| 1876 | .seq_fops = &tcp6_seq_fops, |
| 1877 | }; |
| 1878 | |
| 1879 | int __init tcp6_proc_init(void) |
| 1880 | { |
| 1881 | return tcp_proc_register(&tcp6_seq_afinfo); |
| 1882 | } |
| 1883 | |
| 1884 | void tcp6_proc_exit(void) |
| 1885 | { |
| 1886 | tcp_proc_unregister(&tcp6_seq_afinfo); |
| 1887 | } |
| 1888 | #endif |
| 1889 | |
| 1890 | struct proto tcpv6_prot = { |
| 1891 | .name = "TCPv6", |
| 1892 | .owner = THIS_MODULE, |
| 1893 | .close = tcp_close, |
| 1894 | .connect = tcp_v6_connect, |
| 1895 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1896 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | .ioctl = tcp_ioctl, |
| 1898 | .init = tcp_v6_init_sock, |
| 1899 | .destroy = tcp_v6_destroy_sock, |
| 1900 | .shutdown = tcp_shutdown, |
| 1901 | .setsockopt = tcp_setsockopt, |
| 1902 | .getsockopt = tcp_getsockopt, |
| 1903 | .sendmsg = tcp_sendmsg, |
| 1904 | .recvmsg = tcp_recvmsg, |
| 1905 | .backlog_rcv = tcp_v6_do_rcv, |
| 1906 | .hash = tcp_v6_hash, |
| 1907 | .unhash = tcp_unhash, |
| 1908 | .get_port = tcp_v6_get_port, |
| 1909 | .enter_memory_pressure = tcp_enter_memory_pressure, |
| 1910 | .sockets_allocated = &tcp_sockets_allocated, |
| 1911 | .memory_allocated = &tcp_memory_allocated, |
| 1912 | .memory_pressure = &tcp_memory_pressure, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 1913 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | .sysctl_mem = sysctl_tcp_mem, |
| 1915 | .sysctl_wmem = sysctl_tcp_wmem, |
| 1916 | .sysctl_rmem = sysctl_tcp_rmem, |
| 1917 | .max_header = MAX_TCP_HEADER, |
| 1918 | .obj_size = sizeof(struct tcp6_sock), |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1919 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1920 | .rsk_prot = &tcp6_request_sock_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | }; |
| 1922 | |
| 1923 | static struct inet6_protocol tcpv6_protocol = { |
| 1924 | .handler = tcp_v6_rcv, |
| 1925 | .err_handler = tcp_v6_err, |
| 1926 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| 1927 | }; |
| 1928 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | static struct inet_protosw tcpv6_protosw = { |
| 1930 | .type = SOCK_STREAM, |
| 1931 | .protocol = IPPROTO_TCP, |
| 1932 | .prot = &tcpv6_prot, |
| 1933 | .ops = &inet6_stream_ops, |
| 1934 | .capability = -1, |
| 1935 | .no_check = 0, |
| 1936 | .flags = INET_PROTOSW_PERMANENT, |
| 1937 | }; |
| 1938 | |
| 1939 | void __init tcpv6_init(void) |
| 1940 | { |
| 1941 | /* register inet6 protocol */ |
| 1942 | if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0) |
| 1943 | printk(KERN_ERR "tcpv6_init: Could not register protocol\n"); |
| 1944 | inet6_register_protosw(&tcpv6_protosw); |
| 1945 | } |