Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * TCP 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 | * $Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $ |
| 9 | * |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 10 | * Based on: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/errno.h> |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/socket.h> |
| 32 | #include <linux/sockios.h> |
| 33 | #include <linux/net.h> |
| 34 | #include <linux/jiffies.h> |
| 35 | #include <linux/in.h> |
| 36 | #include <linux/in6.h> |
| 37 | #include <linux/netdevice.h> |
| 38 | #include <linux/init.h> |
| 39 | #include <linux/jhash.h> |
| 40 | #include <linux/ipsec.h> |
| 41 | #include <linux/times.h> |
| 42 | |
| 43 | #include <linux/ipv6.h> |
| 44 | #include <linux/icmpv6.h> |
| 45 | #include <linux/random.h> |
| 46 | |
| 47 | #include <net/tcp.h> |
| 48 | #include <net/ndisc.h> |
Arnaldo Carvalho de Melo | 5324a04 | 2005-08-12 09:26:18 -0300 | [diff] [blame] | 49 | #include <net/inet6_hashtables.h> |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 50 | #include <net/inet6_connection_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <net/ipv6.h> |
| 52 | #include <net/transp_v6.h> |
| 53 | #include <net/addrconf.h> |
| 54 | #include <net/ip6_route.h> |
| 55 | #include <net/ip6_checksum.h> |
| 56 | #include <net/inet_ecn.h> |
| 57 | #include <net/protocol.h> |
| 58 | #include <net/xfrm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #include <net/snmp.h> |
| 60 | #include <net/dsfield.h> |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 61 | #include <net/timewait_sock.h> |
Jeff Garzik | 18134be | 2007-10-26 22:53:14 -0700 | [diff] [blame] | 62 | #include <net/netdma.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | #include <asm/uaccess.h> |
| 65 | |
| 66 | #include <linux/proc_fs.h> |
| 67 | #include <linux/seq_file.h> |
| 68 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 69 | #include <linux/crypto.h> |
| 70 | #include <linux/scatterlist.h> |
| 71 | |
David Woodhouse | ae0f7d5 | 2006-01-11 15:53:04 -0800 | [diff] [blame] | 72 | /* Socket used for sending RSTs and ACKs */ |
| 73 | static struct socket *tcp6_socket; |
| 74 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 75 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 76 | static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 77 | static void tcp_v6_send_check(struct sock *sk, int len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | struct sk_buff *skb); |
| 79 | |
| 80 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 82 | static struct inet_connection_sock_af_ops ipv6_mapped; |
| 83 | static struct inet_connection_sock_af_ops ipv6_specific; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 84 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 85 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
| 86 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 87 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | static void tcp_v6_hash(struct sock *sk) |
| 90 | { |
| 91 | if (sk->sk_state != TCP_CLOSE) { |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 92 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | tcp_prot.hash(sk); |
| 94 | return; |
| 95 | } |
| 96 | local_bh_disable(); |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 97 | __inet6_hash(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | local_bh_enable(); |
| 99 | } |
| 100 | } |
| 101 | |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 102 | static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 103 | struct in6_addr *saddr, |
| 104 | struct in6_addr *daddr, |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 105 | __wsum base) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | { |
| 107 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); |
| 108 | } |
| 109 | |
Gerrit Renker | a94f723 | 2006-11-10 14:06:49 -0800 | [diff] [blame] | 110 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 112 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
| 113 | ipv6_hdr(skb)->saddr.s6_addr32, |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 114 | tcp_hdr(skb)->dest, |
| 115 | tcp_hdr(skb)->source); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 118 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | int addr_len) |
| 120 | { |
| 121 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 122 | struct inet_sock *inet = inet_sk(sk); |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 123 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 125 | struct tcp_sock *tp = tcp_sk(sk); |
| 126 | struct in6_addr *saddr = NULL, *final_p = NULL, final; |
| 127 | struct flowi fl; |
| 128 | struct dst_entry *dst; |
| 129 | int addr_type; |
| 130 | int err; |
| 131 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 132 | if (addr_len < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | return -EINVAL; |
| 134 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 135 | if (usin->sin6_family != AF_INET6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | return(-EAFNOSUPPORT); |
| 137 | |
| 138 | memset(&fl, 0, sizeof(fl)); |
| 139 | |
| 140 | if (np->sndflow) { |
| 141 | fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| 142 | IP6_ECN_flow_init(fl.fl6_flowlabel); |
| 143 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { |
| 144 | struct ip6_flowlabel *flowlabel; |
| 145 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); |
| 146 | if (flowlabel == NULL) |
| 147 | return -EINVAL; |
| 148 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); |
| 149 | fl6_sock_release(flowlabel); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 154 | * connect() to INADDR_ANY means loopback (BSD'ism). |
| 155 | */ |
| 156 | |
| 157 | if(ipv6_addr_any(&usin->sin6_addr)) |
| 158 | usin->sin6_addr.s6_addr[15] = 0x1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | addr_type = ipv6_addr_type(&usin->sin6_addr); |
| 161 | |
| 162 | if(addr_type & IPV6_ADDR_MULTICAST) |
| 163 | return -ENETUNREACH; |
| 164 | |
| 165 | if (addr_type&IPV6_ADDR_LINKLOCAL) { |
| 166 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 167 | usin->sin6_scope_id) { |
| 168 | /* If interface is set while binding, indices |
| 169 | * must coincide. |
| 170 | */ |
| 171 | if (sk->sk_bound_dev_if && |
| 172 | sk->sk_bound_dev_if != usin->sin6_scope_id) |
| 173 | return -EINVAL; |
| 174 | |
| 175 | sk->sk_bound_dev_if = usin->sin6_scope_id; |
| 176 | } |
| 177 | |
| 178 | /* Connect to link-local address requires an interface */ |
| 179 | if (!sk->sk_bound_dev_if) |
| 180 | return -EINVAL; |
| 181 | } |
| 182 | |
| 183 | if (tp->rx_opt.ts_recent_stamp && |
| 184 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { |
| 185 | tp->rx_opt.ts_recent = 0; |
| 186 | tp->rx_opt.ts_recent_stamp = 0; |
| 187 | tp->write_seq = 0; |
| 188 | } |
| 189 | |
| 190 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); |
| 191 | np->flow_label = fl.fl6_flowlabel; |
| 192 | |
| 193 | /* |
| 194 | * TCP over IPv4 |
| 195 | */ |
| 196 | |
| 197 | if (addr_type == IPV6_ADDR_MAPPED) { |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 198 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | struct sockaddr_in sin; |
| 200 | |
| 201 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); |
| 202 | |
| 203 | if (__ipv6_only_sock(sk)) |
| 204 | return -ENETUNREACH; |
| 205 | |
| 206 | sin.sin_family = AF_INET; |
| 207 | sin.sin_port = usin->sin6_port; |
| 208 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
| 209 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 210 | icsk->icsk_af_ops = &ipv6_mapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 212 | #ifdef CONFIG_TCP_MD5SIG |
| 213 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; |
| 214 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
| 216 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); |
| 217 | |
| 218 | if (err) { |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 219 | icsk->icsk_ext_hdr_len = exthdrlen; |
| 220 | icsk->icsk_af_ops = &ipv6_specific; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 222 | #ifdef CONFIG_TCP_MD5SIG |
| 223 | tp->af_specific = &tcp_sock_ipv6_specific; |
| 224 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | goto failure; |
| 226 | } else { |
| 227 | ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), |
| 228 | inet->saddr); |
| 229 | ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), |
| 230 | inet->rcv_saddr); |
| 231 | } |
| 232 | |
| 233 | return err; |
| 234 | } |
| 235 | |
| 236 | if (!ipv6_addr_any(&np->rcv_saddr)) |
| 237 | saddr = &np->rcv_saddr; |
| 238 | |
| 239 | fl.proto = IPPROTO_TCP; |
| 240 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 241 | ipv6_addr_copy(&fl.fl6_src, |
| 242 | (saddr ? saddr : &np->saddr)); |
| 243 | fl.oif = sk->sk_bound_dev_if; |
| 244 | fl.fl_ip_dport = usin->sin6_port; |
| 245 | fl.fl_ip_sport = inet->sport; |
| 246 | |
| 247 | if (np->opt && np->opt->srcrt) { |
| 248 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; |
| 249 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 250 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 251 | final_p = &final; |
| 252 | } |
| 253 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 254 | security_sk_classify_flow(sk, &fl); |
| 255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 257 | if (err) |
| 258 | goto failure; |
| 259 | if (final_p) |
| 260 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 261 | |
Herbert Xu | bb72845 | 2007-12-12 18:48:58 -0800 | [diff] [blame] | 262 | if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 263 | if (err == -EREMOTE) |
| 264 | err = ip6_dst_blackhole(sk, &dst, &fl); |
| 265 | if (err < 0) |
| 266 | goto failure; |
| 267 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
| 269 | if (saddr == NULL) { |
| 270 | saddr = &fl.fl6_src; |
| 271 | ipv6_addr_copy(&np->rcv_saddr, saddr); |
| 272 | } |
| 273 | |
| 274 | /* set the source address */ |
| 275 | ipv6_addr_copy(&np->saddr, saddr); |
| 276 | inet->rcv_saddr = LOOPBACK4_IPV6; |
| 277 | |
Herbert Xu | f83ef8c | 2006-06-30 13:37:03 -0700 | [diff] [blame] | 278 | sk->sk_gso_type = SKB_GSO_TCPV6; |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 279 | __ip6_dst_store(sk, dst, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 281 | icsk->icsk_ext_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | if (np->opt) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 283 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
| 284 | np->opt->opt_nflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| 287 | |
| 288 | inet->dport = usin->sin6_port; |
| 289 | |
| 290 | tcp_set_state(sk, TCP_SYN_SENT); |
Arnaldo Carvalho de Melo | d8313f5 | 2005-12-13 23:25:44 -0800 | [diff] [blame] | 291 | err = inet6_hash_connect(&tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | if (err) |
| 293 | goto late_failure; |
| 294 | |
| 295 | if (!tp->write_seq) |
| 296 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
| 297 | np->daddr.s6_addr32, |
| 298 | inet->sport, |
| 299 | inet->dport); |
| 300 | |
| 301 | err = tcp_connect(sk); |
| 302 | if (err) |
| 303 | goto late_failure; |
| 304 | |
| 305 | return 0; |
| 306 | |
| 307 | late_failure: |
| 308 | tcp_set_state(sk, TCP_CLOSE); |
| 309 | __sk_dst_reset(sk); |
| 310 | failure: |
| 311 | inet->dport = 0; |
| 312 | sk->sk_route_caps = 0; |
| 313 | return err; |
| 314 | } |
| 315 | |
| 316 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
Al Viro | 04ce690 | 2006-11-08 00:21:01 -0800 | [diff] [blame] | 317 | int type, int code, int offset, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | { |
| 319 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 320 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | struct ipv6_pinfo *np; |
| 322 | struct sock *sk; |
| 323 | int err; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 324 | struct tcp_sock *tp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | __u32 seq; |
| 326 | |
Pavel Emelyanov | d86e0da | 2008-01-31 05:07:21 -0800 | [diff] [blame] | 327 | sk = inet6_lookup(skb->dev->nd_net, &tcp_hashinfo, &hdr->daddr, |
| 328 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
| 330 | if (sk == NULL) { |
| 331 | ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
| 332 | return; |
| 333 | } |
| 334 | |
| 335 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 336 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | return; |
| 338 | } |
| 339 | |
| 340 | bh_lock_sock(sk); |
| 341 | if (sock_owned_by_user(sk)) |
| 342 | NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); |
| 343 | |
| 344 | if (sk->sk_state == TCP_CLOSE) |
| 345 | goto out; |
| 346 | |
| 347 | tp = tcp_sk(sk); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 348 | seq = ntohl(th->seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | if (sk->sk_state != TCP_LISTEN && |
| 350 | !between(seq, tp->snd_una, tp->snd_nxt)) { |
| 351 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
| 352 | goto out; |
| 353 | } |
| 354 | |
| 355 | np = inet6_sk(sk); |
| 356 | |
| 357 | if (type == ICMPV6_PKT_TOOBIG) { |
| 358 | struct dst_entry *dst = NULL; |
| 359 | |
| 360 | if (sock_owned_by_user(sk)) |
| 361 | goto out; |
| 362 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) |
| 363 | goto out; |
| 364 | |
| 365 | /* icmp should have updated the destination cache entry */ |
| 366 | dst = __sk_dst_check(sk, np->dst_cookie); |
| 367 | |
| 368 | if (dst == NULL) { |
| 369 | struct inet_sock *inet = inet_sk(sk); |
| 370 | struct flowi fl; |
| 371 | |
| 372 | /* BUGGG_FUTURE: Again, it is not clear how |
| 373 | to handle rthdr case. Ignore this complexity |
| 374 | for now. |
| 375 | */ |
| 376 | memset(&fl, 0, sizeof(fl)); |
| 377 | fl.proto = IPPROTO_TCP; |
| 378 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 379 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| 380 | fl.oif = sk->sk_bound_dev_if; |
| 381 | fl.fl_ip_dport = inet->dport; |
| 382 | fl.fl_ip_sport = inet->sport; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 383 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | if ((err = ip6_dst_lookup(sk, &dst, &fl))) { |
| 386 | sk->sk_err_soft = -err; |
| 387 | goto out; |
| 388 | } |
| 389 | |
| 390 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { |
| 391 | sk->sk_err_soft = -err; |
| 392 | goto out; |
| 393 | } |
| 394 | |
| 395 | } else |
| 396 | dst_hold(dst); |
| 397 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 398 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | tcp_sync_mss(sk, dst_mtu(dst)); |
| 400 | tcp_simple_retransmit(sk); |
| 401 | } /* else let the usual retransmit timer handle it */ |
| 402 | dst_release(dst); |
| 403 | goto out; |
| 404 | } |
| 405 | |
| 406 | icmpv6_err_convert(type, code, &err); |
| 407 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 408 | /* Might be for an request_sock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | switch (sk->sk_state) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 410 | struct request_sock *req, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | case TCP_LISTEN: |
| 412 | if (sock_owned_by_user(sk)) |
| 413 | goto out; |
| 414 | |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 415 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
| 416 | &hdr->saddr, inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | if (!req) |
| 418 | goto out; |
| 419 | |
| 420 | /* ICMPs are not backlogged, hence we cannot get |
| 421 | * an established socket here. |
| 422 | */ |
| 423 | BUG_TRAP(req->sk == NULL); |
| 424 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 425 | if (seq != tcp_rsk(req)->snt_isn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
| 427 | goto out; |
| 428 | } |
| 429 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 430 | inet_csk_reqsk_queue_drop(sk, req, prev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | goto out; |
| 432 | |
| 433 | case TCP_SYN_SENT: |
| 434 | case TCP_SYN_RECV: /* Cannot happen. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 435 | It can, it SYNs are crossed. --ANK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | sk->sk_err = err; |
| 438 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ |
| 439 | |
| 440 | tcp_done(sk); |
| 441 | } else |
| 442 | sk->sk_err_soft = err; |
| 443 | goto out; |
| 444 | } |
| 445 | |
| 446 | if (!sock_owned_by_user(sk) && np->recverr) { |
| 447 | sk->sk_err = err; |
| 448 | sk->sk_error_report(sk); |
| 449 | } else |
| 450 | sk->sk_err_soft = err; |
| 451 | |
| 452 | out: |
| 453 | bh_unlock_sock(sk); |
| 454 | sock_put(sk); |
| 455 | } |
| 456 | |
| 457 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 458 | 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] | 459 | struct dst_entry *dst) |
| 460 | { |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 461 | struct inet6_request_sock *treq = inet6_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 463 | struct sk_buff * skb; |
| 464 | struct ipv6_txoptions *opt = NULL; |
| 465 | struct in6_addr * final_p = NULL, final; |
| 466 | struct flowi fl; |
| 467 | int err = -1; |
| 468 | |
| 469 | memset(&fl, 0, sizeof(fl)); |
| 470 | fl.proto = IPPROTO_TCP; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 471 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
| 472 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | fl.fl6_flowlabel = 0; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 474 | fl.oif = treq->iif; |
| 475 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | fl.fl_ip_sport = inet_sk(sk)->sport; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 477 | security_req_classify_flow(req, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | |
| 479 | if (dst == NULL) { |
| 480 | opt = np->opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | if (opt && opt->srcrt) { |
| 482 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; |
| 483 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 484 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 485 | final_p = &final; |
| 486 | } |
| 487 | |
| 488 | err = ip6_dst_lookup(sk, &dst, &fl); |
| 489 | if (err) |
| 490 | goto done; |
| 491 | if (final_p) |
| 492 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 493 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
| 494 | goto done; |
| 495 | } |
| 496 | |
| 497 | skb = tcp_make_synack(sk, dst, req); |
| 498 | if (skb) { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 499 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
| 501 | th->check = tcp_v6_check(th, skb->len, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 502 | &treq->loc_addr, &treq->rmt_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | csum_partial((char *)th, skb->len, skb->csum)); |
| 504 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 505 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | err = ip6_xmit(sk, skb, &fl, opt, 0); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 507 | err = net_xmit_eval(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | } |
| 509 | |
| 510 | done: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 511 | if (opt && opt != np->opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | sock_kfree_s(sk, opt, opt->tot_len); |
Eric W. Biederman | 78b9104 | 2006-01-31 17:51:44 -0800 | [diff] [blame] | 513 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | return err; |
| 515 | } |
| 516 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 517 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | { |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 519 | if (inet6_rsk(req)->pktopts) |
| 520 | kfree_skb(inet6_rsk(req)->pktopts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | } |
| 522 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 523 | #ifdef CONFIG_TCP_MD5SIG |
| 524 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, |
| 525 | struct in6_addr *addr) |
| 526 | { |
| 527 | struct tcp_sock *tp = tcp_sk(sk); |
| 528 | int i; |
| 529 | |
| 530 | BUG_ON(tp == NULL); |
| 531 | |
| 532 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) |
| 533 | return NULL; |
| 534 | |
| 535 | for (i = 0; i < tp->md5sig_info->entries6; i++) { |
| 536 | if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, addr) == 0) |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 537 | return &tp->md5sig_info->keys6[i].base; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 538 | } |
| 539 | return NULL; |
| 540 | } |
| 541 | |
| 542 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, |
| 543 | struct sock *addr_sk) |
| 544 | { |
| 545 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); |
| 546 | } |
| 547 | |
| 548 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, |
| 549 | struct request_sock *req) |
| 550 | { |
| 551 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); |
| 552 | } |
| 553 | |
| 554 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, |
| 555 | char *newkey, u8 newkeylen) |
| 556 | { |
| 557 | /* Add key to the list */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 558 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 559 | struct tcp_sock *tp = tcp_sk(sk); |
| 560 | struct tcp6_md5sig_key *keys; |
| 561 | |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 562 | key = tcp_v6_md5_do_lookup(sk, peer); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 563 | if (key) { |
| 564 | /* modify existing entry - just update that one */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 565 | kfree(key->key); |
| 566 | key->key = newkey; |
| 567 | key->keylen = newkeylen; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 568 | } else { |
| 569 | /* reallocate new list if current one is full. */ |
| 570 | if (!tp->md5sig_info) { |
| 571 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); |
| 572 | if (!tp->md5sig_info) { |
| 573 | kfree(newkey); |
| 574 | return -ENOMEM; |
| 575 | } |
David S. Miller | 3d7dbea | 2007-06-12 14:36:42 -0700 | [diff] [blame] | 576 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 577 | } |
YOSHIFUJI Hideaki | aacbe8c | 2007-11-20 17:30:56 -0800 | [diff] [blame] | 578 | if (tcp_alloc_md5sig_pool() == NULL) { |
| 579 | kfree(newkey); |
| 580 | return -ENOMEM; |
| 581 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 582 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
| 583 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * |
| 584 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); |
| 585 | |
| 586 | if (!keys) { |
| 587 | tcp_free_md5sig_pool(); |
| 588 | kfree(newkey); |
| 589 | return -ENOMEM; |
| 590 | } |
| 591 | |
| 592 | if (tp->md5sig_info->entries6) |
| 593 | memmove(keys, tp->md5sig_info->keys6, |
| 594 | (sizeof (tp->md5sig_info->keys6[0]) * |
| 595 | tp->md5sig_info->entries6)); |
| 596 | |
| 597 | kfree(tp->md5sig_info->keys6); |
| 598 | tp->md5sig_info->keys6 = keys; |
| 599 | tp->md5sig_info->alloced6++; |
| 600 | } |
| 601 | |
| 602 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, |
| 603 | peer); |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 604 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
| 605 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 606 | |
| 607 | tp->md5sig_info->entries6++; |
| 608 | } |
| 609 | return 0; |
| 610 | } |
| 611 | |
| 612 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, |
| 613 | u8 *newkey, __u8 newkeylen) |
| 614 | { |
| 615 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, |
| 616 | newkey, newkeylen); |
| 617 | } |
| 618 | |
| 619 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) |
| 620 | { |
| 621 | struct tcp_sock *tp = tcp_sk(sk); |
| 622 | int i; |
| 623 | |
| 624 | for (i = 0; i < tp->md5sig_info->entries6; i++) { |
| 625 | if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, peer) == 0) { |
| 626 | /* Free the key */ |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 627 | kfree(tp->md5sig_info->keys6[i].base.key); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 628 | tp->md5sig_info->entries6--; |
| 629 | |
| 630 | if (tp->md5sig_info->entries6 == 0) { |
| 631 | kfree(tp->md5sig_info->keys6); |
| 632 | tp->md5sig_info->keys6 = NULL; |
YOSHIFUJI Hideaki | ca983ce | 2007-07-24 15:27:30 -0700 | [diff] [blame] | 633 | tp->md5sig_info->alloced6 = 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 634 | } else { |
| 635 | /* shrink the database */ |
| 636 | if (tp->md5sig_info->entries6 != i) |
| 637 | memmove(&tp->md5sig_info->keys6[i], |
| 638 | &tp->md5sig_info->keys6[i+1], |
| 639 | (tp->md5sig_info->entries6 - i) |
| 640 | * sizeof (tp->md5sig_info->keys6[0])); |
| 641 | } |
YOSHIFUJI Hideaki | 77adefd | 2007-11-20 17:31:23 -0800 | [diff] [blame] | 642 | tcp_free_md5sig_pool(); |
| 643 | return 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 644 | } |
| 645 | } |
| 646 | return -ENOENT; |
| 647 | } |
| 648 | |
| 649 | static void tcp_v6_clear_md5_list (struct sock *sk) |
| 650 | { |
| 651 | struct tcp_sock *tp = tcp_sk(sk); |
| 652 | int i; |
| 653 | |
| 654 | if (tp->md5sig_info->entries6) { |
| 655 | for (i = 0; i < tp->md5sig_info->entries6; i++) |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 656 | kfree(tp->md5sig_info->keys6[i].base.key); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 657 | tp->md5sig_info->entries6 = 0; |
| 658 | tcp_free_md5sig_pool(); |
| 659 | } |
| 660 | |
| 661 | kfree(tp->md5sig_info->keys6); |
| 662 | tp->md5sig_info->keys6 = NULL; |
| 663 | tp->md5sig_info->alloced6 = 0; |
| 664 | |
| 665 | if (tp->md5sig_info->entries4) { |
| 666 | for (i = 0; i < tp->md5sig_info->entries4; i++) |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 667 | kfree(tp->md5sig_info->keys4[i].base.key); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 668 | tp->md5sig_info->entries4 = 0; |
| 669 | tcp_free_md5sig_pool(); |
| 670 | } |
| 671 | |
| 672 | kfree(tp->md5sig_info->keys4); |
| 673 | tp->md5sig_info->keys4 = NULL; |
| 674 | tp->md5sig_info->alloced4 = 0; |
| 675 | } |
| 676 | |
| 677 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, |
| 678 | int optlen) |
| 679 | { |
| 680 | struct tcp_md5sig cmd; |
| 681 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; |
| 682 | u8 *newkey; |
| 683 | |
| 684 | if (optlen < sizeof(cmd)) |
| 685 | return -EINVAL; |
| 686 | |
| 687 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
| 688 | return -EFAULT; |
| 689 | |
| 690 | if (sin6->sin6_family != AF_INET6) |
| 691 | return -EINVAL; |
| 692 | |
| 693 | if (!cmd.tcpm_keylen) { |
| 694 | if (!tcp_sk(sk)->md5sig_info) |
| 695 | return -ENOENT; |
Brian Haley | e773e4f | 2007-08-24 23:16:08 -0700 | [diff] [blame] | 696 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 697 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
| 698 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); |
| 699 | } |
| 700 | |
| 701 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 702 | return -EINVAL; |
| 703 | |
| 704 | if (!tcp_sk(sk)->md5sig_info) { |
| 705 | struct tcp_sock *tp = tcp_sk(sk); |
| 706 | struct tcp_md5sig_info *p; |
| 707 | |
| 708 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); |
| 709 | if (!p) |
| 710 | return -ENOMEM; |
| 711 | |
| 712 | tp->md5sig_info = p; |
David S. Miller | 3d7dbea | 2007-06-12 14:36:42 -0700 | [diff] [blame] | 713 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 714 | } |
| 715 | |
Arnaldo Carvalho de Melo | af879cc | 2006-11-17 12:14:37 -0200 | [diff] [blame] | 716 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 717 | if (!newkey) |
| 718 | return -ENOMEM; |
Brian Haley | e773e4f | 2007-08-24 23:16:08 -0700 | [diff] [blame] | 719 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 720 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
| 721 | newkey, cmd.tcpm_keylen); |
| 722 | } |
| 723 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); |
| 724 | } |
| 725 | |
| 726 | static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, |
| 727 | struct in6_addr *saddr, |
| 728 | struct in6_addr *daddr, |
| 729 | struct tcphdr *th, int protocol, |
YOSHIFUJI Hideaki | 9cb5734 | 2008-01-12 02:16:03 -0800 | [diff] [blame] | 730 | unsigned int tcplen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 731 | { |
| 732 | struct scatterlist sg[4]; |
| 733 | __u16 data_len; |
| 734 | int block = 0; |
Al Viro | 8e5200f | 2006-11-20 18:06:37 -0800 | [diff] [blame] | 735 | __sum16 cksum; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 736 | struct tcp_md5sig_pool *hp; |
| 737 | struct tcp6_pseudohdr *bp; |
| 738 | struct hash_desc *desc; |
| 739 | int err; |
| 740 | unsigned int nbytes = 0; |
| 741 | |
| 742 | hp = tcp_get_md5sig_pool(); |
| 743 | if (!hp) { |
| 744 | printk(KERN_WARNING "%s(): hash pool not found...\n", __FUNCTION__); |
| 745 | goto clear_hash_noput; |
| 746 | } |
| 747 | bp = &hp->md5_blk.ip6; |
| 748 | desc = &hp->md5_desc; |
| 749 | |
| 750 | /* 1. TCP pseudo-header (RFC2460) */ |
| 751 | ipv6_addr_copy(&bp->saddr, saddr); |
| 752 | ipv6_addr_copy(&bp->daddr, daddr); |
| 753 | bp->len = htonl(tcplen); |
| 754 | bp->protocol = htonl(protocol); |
| 755 | |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 756 | sg_init_table(sg, 4); |
| 757 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 758 | sg_set_buf(&sg[block++], bp, sizeof(*bp)); |
| 759 | nbytes += sizeof(*bp); |
| 760 | |
| 761 | /* 2. TCP header, excluding options */ |
| 762 | cksum = th->check; |
| 763 | th->check = 0; |
| 764 | sg_set_buf(&sg[block++], th, sizeof(*th)); |
| 765 | nbytes += sizeof(*th); |
| 766 | |
| 767 | /* 3. TCP segment data (if any) */ |
| 768 | data_len = tcplen - (th->doff << 2); |
| 769 | if (data_len > 0) { |
| 770 | u8 *data = (u8 *)th + (th->doff << 2); |
| 771 | sg_set_buf(&sg[block++], data, data_len); |
| 772 | nbytes += data_len; |
| 773 | } |
| 774 | |
| 775 | /* 4. shared key */ |
| 776 | sg_set_buf(&sg[block++], key->key, key->keylen); |
| 777 | nbytes += key->keylen; |
| 778 | |
Jens Axboe | c46f233 | 2007-10-31 12:06:37 +0100 | [diff] [blame] | 779 | sg_mark_end(&sg[block - 1]); |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 780 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 781 | /* Now store the hash into the packet */ |
| 782 | err = crypto_hash_init(desc); |
| 783 | if (err) { |
| 784 | printk(KERN_WARNING "%s(): hash_init failed\n", __FUNCTION__); |
| 785 | goto clear_hash; |
| 786 | } |
| 787 | err = crypto_hash_update(desc, sg, nbytes); |
| 788 | if (err) { |
| 789 | printk(KERN_WARNING "%s(): hash_update failed\n", __FUNCTION__); |
| 790 | goto clear_hash; |
| 791 | } |
| 792 | err = crypto_hash_final(desc, md5_hash); |
| 793 | if (err) { |
| 794 | printk(KERN_WARNING "%s(): hash_final failed\n", __FUNCTION__); |
| 795 | goto clear_hash; |
| 796 | } |
| 797 | |
| 798 | /* Reset header, and free up the crypto */ |
| 799 | tcp_put_md5sig_pool(); |
| 800 | th->check = cksum; |
| 801 | out: |
| 802 | return 0; |
| 803 | clear_hash: |
| 804 | tcp_put_md5sig_pool(); |
| 805 | clear_hash_noput: |
| 806 | memset(md5_hash, 0, 16); |
| 807 | goto out; |
| 808 | } |
| 809 | |
| 810 | static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, |
| 811 | struct sock *sk, |
| 812 | struct dst_entry *dst, |
| 813 | struct request_sock *req, |
| 814 | struct tcphdr *th, int protocol, |
YOSHIFUJI Hideaki | 9cb5734 | 2008-01-12 02:16:03 -0800 | [diff] [blame] | 815 | unsigned int tcplen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 816 | { |
| 817 | struct in6_addr *saddr, *daddr; |
| 818 | |
| 819 | if (sk) { |
| 820 | saddr = &inet6_sk(sk)->saddr; |
| 821 | daddr = &inet6_sk(sk)->daddr; |
| 822 | } else { |
| 823 | saddr = &inet6_rsk(req)->loc_addr; |
| 824 | daddr = &inet6_rsk(req)->rmt_addr; |
| 825 | } |
| 826 | return tcp_v6_do_calc_md5_hash(md5_hash, key, |
| 827 | saddr, daddr, |
| 828 | th, protocol, tcplen); |
| 829 | } |
| 830 | |
| 831 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) |
| 832 | { |
| 833 | __u8 *hash_location = NULL; |
| 834 | struct tcp_md5sig_key *hash_expected; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 835 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 836 | struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 837 | int length = (th->doff << 2) - sizeof (*th); |
| 838 | int genhash; |
| 839 | u8 *ptr; |
| 840 | u8 newhash[16]; |
| 841 | |
| 842 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); |
| 843 | |
| 844 | /* If the TCP option is too short, we can short cut */ |
| 845 | if (length < TCPOLEN_MD5SIG) |
| 846 | return hash_expected ? 1 : 0; |
| 847 | |
| 848 | /* parse options */ |
| 849 | ptr = (u8*)(th + 1); |
| 850 | while (length > 0) { |
| 851 | int opcode = *ptr++; |
| 852 | int opsize; |
| 853 | |
| 854 | switch(opcode) { |
| 855 | case TCPOPT_EOL: |
| 856 | goto done_opts; |
| 857 | case TCPOPT_NOP: |
| 858 | length--; |
| 859 | continue; |
| 860 | default: |
| 861 | opsize = *ptr++; |
| 862 | if (opsize < 2 || opsize > length) |
| 863 | goto done_opts; |
| 864 | if (opcode == TCPOPT_MD5SIG) { |
| 865 | hash_location = ptr; |
| 866 | goto done_opts; |
| 867 | } |
| 868 | } |
| 869 | ptr += opsize - 2; |
| 870 | length -= opsize; |
| 871 | } |
| 872 | |
| 873 | done_opts: |
| 874 | /* do we have a hash as expected? */ |
| 875 | if (!hash_expected) { |
| 876 | if (!hash_location) |
| 877 | return 0; |
| 878 | if (net_ratelimit()) { |
| 879 | printk(KERN_INFO "MD5 Hash NOT expected but found " |
| 880 | "(" NIP6_FMT ", %u)->" |
| 881 | "(" NIP6_FMT ", %u)\n", |
| 882 | NIP6(ip6h->saddr), ntohs(th->source), |
| 883 | NIP6(ip6h->daddr), ntohs(th->dest)); |
| 884 | } |
| 885 | return 1; |
| 886 | } |
| 887 | |
| 888 | if (!hash_location) { |
| 889 | if (net_ratelimit()) { |
| 890 | printk(KERN_INFO "MD5 Hash expected but NOT found " |
| 891 | "(" NIP6_FMT ", %u)->" |
| 892 | "(" NIP6_FMT ", %u)\n", |
| 893 | NIP6(ip6h->saddr), ntohs(th->source), |
| 894 | NIP6(ip6h->daddr), ntohs(th->dest)); |
| 895 | } |
| 896 | return 1; |
| 897 | } |
| 898 | |
| 899 | /* check the signature */ |
| 900 | genhash = tcp_v6_do_calc_md5_hash(newhash, |
| 901 | hash_expected, |
| 902 | &ip6h->saddr, &ip6h->daddr, |
| 903 | th, sk->sk_protocol, |
| 904 | skb->len); |
| 905 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
| 906 | if (net_ratelimit()) { |
| 907 | printk(KERN_INFO "MD5 Hash %s for " |
| 908 | "(" NIP6_FMT ", %u)->" |
| 909 | "(" NIP6_FMT ", %u)\n", |
| 910 | genhash ? "failed" : "mismatch", |
| 911 | NIP6(ip6h->saddr), ntohs(th->source), |
| 912 | NIP6(ip6h->daddr), ntohs(th->dest)); |
| 913 | } |
| 914 | return 1; |
| 915 | } |
| 916 | return 0; |
| 917 | } |
| 918 | #endif |
| 919 | |
David S. Miller | 9ec75fe | 2006-11-09 16:26:09 -0800 | [diff] [blame] | 920 | static struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | .family = AF_INET6, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 922 | .obj_size = sizeof(struct tcp6_request_sock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | .rtx_syn_ack = tcp_v6_send_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 924 | .send_ack = tcp_v6_reqsk_send_ack, |
| 925 | .destructor = tcp_v6_reqsk_destructor, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | .send_reset = tcp_v6_send_reset |
| 927 | }; |
| 928 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 929 | #ifdef CONFIG_TCP_MD5SIG |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 930 | static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 931 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 932 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 933 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 934 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 935 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
| 936 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
| 937 | .twsk_unique = tcp_twsk_unique, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 938 | .twsk_destructor= tcp_twsk_destructor, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 939 | }; |
| 940 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 941 | static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | { |
| 943 | struct ipv6_pinfo *np = inet6_sk(sk); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 944 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 946 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 948 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 949 | skb->csum_offset = offsetof(struct tcphdr, check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | } else { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 951 | th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
| 952 | csum_partial((char *)th, th->doff<<2, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | skb->csum)); |
| 954 | } |
| 955 | } |
| 956 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 957 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
| 958 | { |
| 959 | struct ipv6hdr *ipv6h; |
| 960 | struct tcphdr *th; |
| 961 | |
| 962 | if (!pskb_may_pull(skb, sizeof(*th))) |
| 963 | return -EINVAL; |
| 964 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 965 | ipv6h = ipv6_hdr(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 966 | th = tcp_hdr(skb); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 967 | |
| 968 | th->check = 0; |
| 969 | th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, |
| 970 | IPPROTO_TCP, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 971 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 972 | skb->csum_offset = offsetof(struct tcphdr, check); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 973 | skb->ip_summed = CHECKSUM_PARTIAL; |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 974 | return 0; |
| 975 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 977 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 979 | struct tcphdr *th = tcp_hdr(skb), *t1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | struct sk_buff *buff; |
| 981 | struct flowi fl; |
YOSHIFUJI Hideaki | 9cb5734 | 2008-01-12 02:16:03 -0800 | [diff] [blame] | 982 | unsigned int tot_len = sizeof(*th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 983 | #ifdef CONFIG_TCP_MD5SIG |
| 984 | struct tcp_md5sig_key *key; |
| 985 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | |
| 987 | if (th->rst) |
| 988 | return; |
| 989 | |
| 990 | if (!ipv6_unicast_destination(skb)) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 991 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 993 | #ifdef CONFIG_TCP_MD5SIG |
| 994 | if (sk) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 995 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 996 | else |
| 997 | key = NULL; |
| 998 | |
| 999 | if (key) |
| 1000 | tot_len += TCPOLEN_MD5SIG_ALIGNED; |
| 1001 | #endif |
| 1002 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | /* |
| 1004 | * We need to grab some memory, and put together an RST, |
| 1005 | * and then put it into the queue to be sent. |
| 1006 | */ |
| 1007 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1008 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | GFP_ATOMIC); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1010 | if (buff == NULL) |
| 1011 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1013 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1015 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | |
| 1017 | /* Swap the send and the receive. */ |
| 1018 | memset(t1, 0, sizeof(*t1)); |
| 1019 | t1->dest = th->source; |
| 1020 | t1->source = th->dest; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1021 | t1->doff = tot_len / 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | t1->rst = 1; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1023 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | if(th->ack) { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1025 | t1->seq = th->ack_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | } else { |
| 1027 | t1->ack = 1; |
| 1028 | t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin |
| 1029 | + skb->len - (th->doff<<2)); |
| 1030 | } |
| 1031 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1032 | #ifdef CONFIG_TCP_MD5SIG |
| 1033 | if (key) { |
Al Viro | 8e5200f | 2006-11-20 18:06:37 -0800 | [diff] [blame] | 1034 | __be32 *opt = (__be32*)(t1 + 1); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1035 | opt[0] = htonl((TCPOPT_NOP << 24) | |
| 1036 | (TCPOPT_NOP << 16) | |
| 1037 | (TCPOPT_MD5SIG << 8) | |
| 1038 | TCPOLEN_MD5SIG); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1039 | tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key, |
| 1040 | &ipv6_hdr(skb)->daddr, |
| 1041 | &ipv6_hdr(skb)->saddr, |
| 1042 | t1, IPPROTO_TCP, tot_len); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1043 | } |
| 1044 | #endif |
| 1045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); |
| 1047 | |
| 1048 | memset(&fl, 0, sizeof(fl)); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1049 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
| 1050 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | |
| 1052 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, |
| 1053 | sizeof(*t1), IPPROTO_TCP, |
| 1054 | buff->csum); |
| 1055 | |
| 1056 | fl.proto = IPPROTO_TCP; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1057 | fl.oif = inet6_iif(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | fl.fl_ip_dport = t1->dest; |
| 1059 | fl.fl_ip_sport = t1->source; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 1060 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | |
| 1062 | /* sk = NULL, but it is safe for now. RST socket required. */ |
| 1063 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { |
| 1064 | |
Arnaldo Carvalho de Melo | ecc51b6 | 2005-12-12 14:38:10 -0800 | [diff] [blame] | 1065 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
David Woodhouse | ae0f7d5 | 2006-01-11 15:53:04 -0800 | [diff] [blame] | 1066 | ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0); |
Arnaldo Carvalho de Melo | ecc51b6 | 2005-12-12 14:38:10 -0800 | [diff] [blame] | 1067 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
| 1068 | TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | return; |
Arnaldo Carvalho de Melo | ecc51b6 | 2005-12-12 14:38:10 -0800 | [diff] [blame] | 1070 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | } |
| 1072 | |
| 1073 | kfree_skb(buff); |
| 1074 | } |
| 1075 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1076 | static void tcp_v6_send_ack(struct tcp_timewait_sock *tw, |
| 1077 | struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1079 | struct tcphdr *th = tcp_hdr(skb), *t1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | struct sk_buff *buff; |
| 1081 | struct flowi fl; |
YOSHIFUJI Hideaki | 9cb5734 | 2008-01-12 02:16:03 -0800 | [diff] [blame] | 1082 | unsigned int tot_len = sizeof(struct tcphdr); |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1083 | __be32 *topt; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1084 | #ifdef CONFIG_TCP_MD5SIG |
| 1085 | struct tcp_md5sig_key *key; |
| 1086 | struct tcp_md5sig_key tw_key; |
| 1087 | #endif |
| 1088 | |
| 1089 | #ifdef CONFIG_TCP_MD5SIG |
| 1090 | if (!tw && skb->sk) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1091 | key = tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1092 | } else if (tw && tw->tw_md5_keylen) { |
| 1093 | tw_key.key = tw->tw_md5_key; |
| 1094 | tw_key.keylen = tw->tw_md5_keylen; |
| 1095 | key = &tw_key; |
| 1096 | } else { |
| 1097 | key = NULL; |
| 1098 | } |
| 1099 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | |
| 1101 | if (ts) |
YOSHIFUJI Hideaki | 4244f8a | 2006-10-10 19:40:50 -0700 | [diff] [blame] | 1102 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1103 | #ifdef CONFIG_TCP_MD5SIG |
| 1104 | if (key) |
| 1105 | tot_len += TCPOLEN_MD5SIG_ALIGNED; |
| 1106 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | |
| 1108 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
| 1109 | GFP_ATOMIC); |
| 1110 | if (buff == NULL) |
| 1111 | return; |
| 1112 | |
| 1113 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
| 1114 | |
| 1115 | t1 = (struct tcphdr *) skb_push(buff,tot_len); |
| 1116 | |
| 1117 | /* Swap the send and the receive. */ |
| 1118 | memset(t1, 0, sizeof(*t1)); |
| 1119 | t1->dest = th->source; |
| 1120 | t1->source = th->dest; |
| 1121 | t1->doff = tot_len/4; |
| 1122 | t1->seq = htonl(seq); |
| 1123 | t1->ack_seq = htonl(ack); |
| 1124 | t1->ack = 1; |
| 1125 | t1->window = htons(win); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1126 | |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1127 | topt = (__be32 *)(t1 + 1); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | if (ts) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1130 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 1131 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); |
| 1132 | *topt++ = htonl(tcp_time_stamp); |
| 1133 | *topt = htonl(ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | } |
| 1135 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1136 | #ifdef CONFIG_TCP_MD5SIG |
| 1137 | if (key) { |
| 1138 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 1139 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1140 | tcp_v6_do_calc_md5_hash((__u8 *)topt, key, |
| 1141 | &ipv6_hdr(skb)->daddr, |
| 1142 | &ipv6_hdr(skb)->saddr, |
| 1143 | t1, IPPROTO_TCP, tot_len); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1144 | } |
| 1145 | #endif |
| 1146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | buff->csum = csum_partial((char *)t1, tot_len, 0); |
| 1148 | |
| 1149 | memset(&fl, 0, sizeof(fl)); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1150 | ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
| 1151 | ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | |
| 1153 | t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, |
| 1154 | tot_len, IPPROTO_TCP, |
| 1155 | buff->csum); |
| 1156 | |
| 1157 | fl.proto = IPPROTO_TCP; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1158 | fl.oif = inet6_iif(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | fl.fl_ip_dport = t1->dest; |
| 1160 | fl.fl_ip_sport = t1->source; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 1161 | security_skb_classify_flow(skb, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | |
| 1163 | if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) { |
Arnaldo Carvalho de Melo | ecc51b6 | 2005-12-12 14:38:10 -0800 | [diff] [blame] | 1164 | if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
David Woodhouse | ae0f7d5 | 2006-01-11 15:53:04 -0800 | [diff] [blame] | 1165 | ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0); |
Arnaldo Carvalho de Melo | ecc51b6 | 2005-12-12 14:38:10 -0800 | [diff] [blame] | 1166 | TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | return; |
Arnaldo Carvalho de Melo | ecc51b6 | 2005-12-12 14:38:10 -0800 | [diff] [blame] | 1168 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | } |
| 1170 | |
| 1171 | kfree_skb(buff); |
| 1172 | } |
| 1173 | |
| 1174 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 1175 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1176 | struct inet_timewait_sock *tw = inet_twsk(sk); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1177 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1179 | tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1180 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
| 1181 | tcptw->tw_ts_recent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1183 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | } |
| 1185 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1186 | 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] | 1187 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1188 | tcp_v6_send_ack(NULL, 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] | 1189 | } |
| 1190 | |
| 1191 | |
| 1192 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
| 1193 | { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1194 | struct request_sock *req, **prev; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1195 | const struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | struct sock *nsk; |
| 1197 | |
| 1198 | /* Find possible connection requests. */ |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 1199 | req = inet6_csk_search_req(sk, &prev, th->source, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1200 | &ipv6_hdr(skb)->saddr, |
| 1201 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | if (req) |
| 1203 | return tcp_check_req(sk, skb, req, prev); |
| 1204 | |
Pavel Emelyanov | d86e0da | 2008-01-31 05:07:21 -0800 | [diff] [blame] | 1205 | nsk = __inet6_lookup_established(sk->sk_net, &tcp_hashinfo, |
| 1206 | &ipv6_hdr(skb)->saddr, th->source, |
| 1207 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | |
| 1209 | if (nsk) { |
| 1210 | if (nsk->sk_state != TCP_TIME_WAIT) { |
| 1211 | bh_lock_sock(nsk); |
| 1212 | return nsk; |
| 1213 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1214 | inet_twsk_put(inet_twsk(nsk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | return NULL; |
| 1216 | } |
| 1217 | |
| 1218 | #if 0 /*def CONFIG_SYN_COOKIES*/ |
| 1219 | if (!th->rst && !th->syn && th->ack) |
| 1220 | sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt)); |
| 1221 | #endif |
| 1222 | return sk; |
| 1223 | } |
| 1224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | /* FIXME: this is substantially similar to the ipv4 code. |
| 1226 | * Can some kind of merge be done? -- erics |
| 1227 | */ |
| 1228 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1229 | { |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1230 | struct inet6_request_sock *treq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1232 | struct tcp_options_received tmp_opt; |
| 1233 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1234 | struct request_sock *req = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | __u32 isn = TCP_SKB_CB(skb)->when; |
| 1236 | |
| 1237 | if (skb->protocol == htons(ETH_P_IP)) |
| 1238 | return tcp_v4_conn_request(sk, skb); |
| 1239 | |
| 1240 | if (!ipv6_unicast_destination(skb)) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1241 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | |
| 1243 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1244 | * There are no SYN attacks on IPv6, yet... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1246 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | if (net_ratelimit()) |
| 1248 | printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n"); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1249 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | } |
| 1251 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1252 | 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] | 1253 | goto drop; |
| 1254 | |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1255 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | if (req == NULL) |
| 1257 | goto drop; |
| 1258 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1259 | #ifdef CONFIG_TCP_MD5SIG |
| 1260 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; |
| 1261 | #endif |
| 1262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | tcp_clear_options(&tmp_opt); |
| 1264 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| 1265 | tmp_opt.user_mss = tp->rx_opt.user_mss; |
| 1266 | |
| 1267 | tcp_parse_options(skb, &tmp_opt, 0); |
| 1268 | |
| 1269 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
| 1270 | tcp_openreq_init(req, &tmp_opt, skb); |
| 1271 | |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1272 | treq = inet6_rsk(req); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1273 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
| 1274 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1275 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1276 | treq->pktopts = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | if (ipv6_opt_accepted(sk, skb) || |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1278 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
| 1279 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | atomic_inc(&skb->users); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1281 | treq->pktopts = skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1283 | treq->iif = sk->sk_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | |
| 1285 | /* So that link locals have meaning */ |
| 1286 | if (!sk->sk_bound_dev_if && |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1287 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1288 | treq->iif = inet6_iif(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1290 | if (isn == 0) |
Gerrit Renker | a94f723 | 2006-11-10 14:06:49 -0800 | [diff] [blame] | 1291 | isn = tcp_v6_init_sequence(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1293 | tcp_rsk(req)->snt_isn = isn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 1295 | security_inet_conn_request(sk, skb, req); |
| 1296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | if (tcp_v6_send_synack(sk, req, NULL)) |
| 1298 | goto drop; |
| 1299 | |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 1300 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | return 0; |
| 1302 | |
| 1303 | drop: |
| 1304 | if (req) |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1305 | reqsk_free(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | return 0; /* don't send reset */ |
| 1308 | } |
| 1309 | |
| 1310 | 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] | 1311 | struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | struct dst_entry *dst) |
| 1313 | { |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1314 | struct inet6_request_sock *treq = inet6_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
| 1316 | struct tcp6_sock *newtcp6sk; |
| 1317 | struct inet_sock *newinet; |
| 1318 | struct tcp_sock *newtp; |
| 1319 | struct sock *newsk; |
| 1320 | struct ipv6_txoptions *opt; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1321 | #ifdef CONFIG_TCP_MD5SIG |
| 1322 | struct tcp_md5sig_key *key; |
| 1323 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | |
| 1325 | if (skb->protocol == htons(ETH_P_IP)) { |
| 1326 | /* |
| 1327 | * v6 mapped |
| 1328 | */ |
| 1329 | |
| 1330 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); |
| 1331 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1332 | if (newsk == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | return NULL; |
| 1334 | |
| 1335 | newtcp6sk = (struct tcp6_sock *)newsk; |
| 1336 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| 1337 | |
| 1338 | newinet = inet_sk(newsk); |
| 1339 | newnp = inet6_sk(newsk); |
| 1340 | newtp = tcp_sk(newsk); |
| 1341 | |
| 1342 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 1343 | |
| 1344 | ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), |
| 1345 | newinet->daddr); |
| 1346 | |
| 1347 | ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), |
| 1348 | newinet->saddr); |
| 1349 | |
| 1350 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); |
| 1351 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1352 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1354 | #ifdef CONFIG_TCP_MD5SIG |
| 1355 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; |
| 1356 | #endif |
| 1357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | newnp->pktoptions = NULL; |
| 1359 | newnp->opt = NULL; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1360 | newnp->mcast_oif = inet6_iif(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1361 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1363 | /* |
| 1364 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count |
| 1365 | * here, tcp_create_openreq_child now does this for us, see the comment in |
| 1366 | * that function for the gory details. -acme |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | |
| 1369 | /* It is tricky place. Until this moment IPv4 tcp |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1370 | worked with IPv6 icsk.icsk_af_ops. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | Sync it now. |
| 1372 | */ |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1373 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | |
| 1375 | return newsk; |
| 1376 | } |
| 1377 | |
| 1378 | opt = np->opt; |
| 1379 | |
| 1380 | if (sk_acceptq_is_full(sk)) |
| 1381 | goto out_overflow; |
| 1382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | if (dst == NULL) { |
| 1384 | struct in6_addr *final_p = NULL, final; |
| 1385 | struct flowi fl; |
| 1386 | |
| 1387 | memset(&fl, 0, sizeof(fl)); |
| 1388 | fl.proto = IPPROTO_TCP; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1389 | ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | if (opt && opt->srcrt) { |
| 1391 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; |
| 1392 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 1393 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 1394 | final_p = &final; |
| 1395 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1396 | ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | fl.oif = sk->sk_bound_dev_if; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1398 | fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | fl.fl_ip_sport = inet_sk(sk)->sport; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 1400 | security_req_classify_flow(req, &fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | |
| 1402 | if (ip6_dst_lookup(sk, &dst, &fl)) |
| 1403 | goto out; |
| 1404 | |
| 1405 | if (final_p) |
| 1406 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 1407 | |
| 1408 | if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
| 1409 | goto out; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1410 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | |
| 1412 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1413 | if (newsk == NULL) |
| 1414 | goto out; |
| 1415 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1416 | /* |
| 1417 | * No need to charge this sock to the relevant IPv6 refcnt debug socks |
| 1418 | * count here, tcp_create_openreq_child now does this for us, see the |
| 1419 | * comment in that function for the gory details. -acme |
| 1420 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | |
Stephen Hemminger | 59eed27 | 2006-08-25 15:55:43 -0700 | [diff] [blame] | 1422 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 1423 | __ip6_dst_store(newsk, dst, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | |
| 1425 | newtcp6sk = (struct tcp6_sock *)newsk; |
| 1426 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| 1427 | |
| 1428 | newtp = tcp_sk(newsk); |
| 1429 | newinet = inet_sk(newsk); |
| 1430 | newnp = inet6_sk(newsk); |
| 1431 | |
| 1432 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 1433 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1434 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
| 1435 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); |
| 1436 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); |
| 1437 | newsk->sk_bound_dev_if = treq->iif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1439 | /* Now IPv6 options... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | |
| 1441 | First: no IPv4 options. |
| 1442 | */ |
| 1443 | newinet->opt = NULL; |
Masayuki Nakagawa | d35690b | 2007-03-16 16:14:03 -0700 | [diff] [blame] | 1444 | newnp->ipv6_fl_list = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | |
| 1446 | /* Clone RX bits */ |
| 1447 | newnp->rxopt.all = np->rxopt.all; |
| 1448 | |
| 1449 | /* Clone pktoptions received with SYN */ |
| 1450 | newnp->pktoptions = NULL; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1451 | if (treq->pktopts != NULL) { |
| 1452 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); |
| 1453 | kfree_skb(treq->pktopts); |
| 1454 | treq->pktopts = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | if (newnp->pktoptions) |
| 1456 | skb_set_owner_r(newnp->pktoptions, newsk); |
| 1457 | } |
| 1458 | newnp->opt = NULL; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1459 | newnp->mcast_oif = inet6_iif(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1460 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | |
| 1462 | /* Clone native IPv6 options from listening socket (if any) |
| 1463 | |
| 1464 | Yes, keeping reference count would be much more clever, |
| 1465 | but we make one more one thing there: reattach optmem |
| 1466 | to newsk. |
| 1467 | */ |
| 1468 | if (opt) { |
| 1469 | newnp->opt = ipv6_dup_options(newsk, opt); |
| 1470 | if (opt != np->opt) |
| 1471 | sock_kfree_s(sk, opt, opt->tot_len); |
| 1472 | } |
| 1473 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1474 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | if (newnp->opt) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1476 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
| 1477 | newnp->opt->opt_flen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | |
John Heffner | 5d424d5 | 2006-03-20 17:53:41 -0800 | [diff] [blame] | 1479 | tcp_mtup_init(newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | tcp_sync_mss(newsk, dst_mtu(dst)); |
| 1481 | newtp->advmss = dst_metric(dst, RTAX_ADVMSS); |
| 1482 | tcp_initialize_rcv_mss(newsk); |
| 1483 | |
| 1484 | newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; |
| 1485 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1486 | #ifdef CONFIG_TCP_MD5SIG |
| 1487 | /* Copy over the MD5 key from the original socket */ |
| 1488 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { |
| 1489 | /* We're using one, so create a matching key |
| 1490 | * on the newsk structure. If we fail to get |
| 1491 | * memory, then we end up not copying the key |
| 1492 | * across. Shucks. |
| 1493 | */ |
Arnaldo Carvalho de Melo | af879cc | 2006-11-17 12:14:37 -0200 | [diff] [blame] | 1494 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
| 1495 | if (newkey != NULL) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1496 | tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr, |
| 1497 | newkey, key->keylen); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1498 | } |
| 1499 | #endif |
| 1500 | |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1501 | __inet6_hash(newsk); |
| 1502 | inet_inherit_port(sk, newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | |
| 1504 | return newsk; |
| 1505 | |
| 1506 | out_overflow: |
| 1507 | NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); |
| 1508 | out: |
| 1509 | NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); |
| 1510 | if (opt && opt != np->opt) |
| 1511 | sock_kfree_s(sk, opt, opt->tot_len); |
| 1512 | dst_release(dst); |
| 1513 | return NULL; |
| 1514 | } |
| 1515 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 1516 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1518 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1519 | if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1520 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1521 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | return 0; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1523 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | } |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1525 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1526 | skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1527 | &ipv6_hdr(skb)->saddr, |
| 1528 | &ipv6_hdr(skb)->daddr, 0)); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | if (skb->len <= 76) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1531 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | } |
| 1533 | return 0; |
| 1534 | } |
| 1535 | |
| 1536 | /* The socket must have it's spinlock held when we get |
| 1537 | * here. |
| 1538 | * |
| 1539 | * We have a potential double-lock case here, so even when |
| 1540 | * doing backlog processing we use the BH locking scheme. |
| 1541 | * This is because we cannot sleep with the original spinlock |
| 1542 | * held. |
| 1543 | */ |
| 1544 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1545 | { |
| 1546 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1547 | struct tcp_sock *tp; |
| 1548 | struct sk_buff *opt_skb = NULL; |
| 1549 | |
| 1550 | /* Imagine: socket is IPv6. IPv4 packet arrives, |
| 1551 | goes to IPv4 receive handler and backlogged. |
| 1552 | From backlog it always goes here. Kerboom... |
| 1553 | Fortunately, tcp_rcv_established and rcv_established |
| 1554 | handle them correctly, but it is not case with |
| 1555 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK |
| 1556 | */ |
| 1557 | |
| 1558 | if (skb->protocol == htons(ETH_P_IP)) |
| 1559 | return tcp_v4_do_rcv(sk, skb); |
| 1560 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1561 | #ifdef CONFIG_TCP_MD5SIG |
| 1562 | if (tcp_v6_inbound_md5_hash (sk, skb)) |
| 1563 | goto discard; |
| 1564 | #endif |
| 1565 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1566 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | goto discard; |
| 1568 | |
| 1569 | /* |
| 1570 | * socket locking is here for SMP purposes as backlog rcv |
| 1571 | * is currently called with bh processing disabled. |
| 1572 | */ |
| 1573 | |
| 1574 | /* Do Stevens' IPV6_PKTOPTIONS. |
| 1575 | |
| 1576 | Yes, guys, it is the only place in our code, where we |
| 1577 | may make it not affecting IPv4. |
| 1578 | The rest of code is protocol independent, |
| 1579 | and I do not like idea to uglify IPv4. |
| 1580 | |
| 1581 | Actually, all the idea behind IPV6_PKTOPTIONS |
| 1582 | looks not very well thought. For now we latch |
| 1583 | options, received in the last packet, enqueued |
| 1584 | by tcp. Feel free to propose better solution. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1585 | --ANK (980728) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | */ |
| 1587 | if (np->rxopt.all) |
| 1588 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
| 1589 | |
| 1590 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
| 1591 | TCP_CHECK_TIMER(sk); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1592 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | goto reset; |
| 1594 | TCP_CHECK_TIMER(sk); |
| 1595 | if (opt_skb) |
| 1596 | goto ipv6_pktoptions; |
| 1597 | return 0; |
| 1598 | } |
| 1599 | |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 1600 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | goto csum_err; |
| 1602 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1603 | if (sk->sk_state == TCP_LISTEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
| 1605 | if (!nsk) |
| 1606 | goto discard; |
| 1607 | |
| 1608 | /* |
| 1609 | * Queue it on the new socket if the new socket is active, |
| 1610 | * otherwise we just shortcircuit this and continue with |
| 1611 | * the new socket.. |
| 1612 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1613 | if(nsk != sk) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | if (tcp_child_process(sk, nsk, skb)) |
| 1615 | goto reset; |
| 1616 | if (opt_skb) |
| 1617 | __kfree_skb(opt_skb); |
| 1618 | return 0; |
| 1619 | } |
| 1620 | } |
| 1621 | |
| 1622 | TCP_CHECK_TIMER(sk); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1623 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | goto reset; |
| 1625 | TCP_CHECK_TIMER(sk); |
| 1626 | if (opt_skb) |
| 1627 | goto ipv6_pktoptions; |
| 1628 | return 0; |
| 1629 | |
| 1630 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1631 | tcp_v6_send_reset(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | discard: |
| 1633 | if (opt_skb) |
| 1634 | __kfree_skb(opt_skb); |
| 1635 | kfree_skb(skb); |
| 1636 | return 0; |
| 1637 | csum_err: |
| 1638 | TCP_INC_STATS_BH(TCP_MIB_INERRS); |
| 1639 | goto discard; |
| 1640 | |
| 1641 | |
| 1642 | ipv6_pktoptions: |
| 1643 | /* Do you ask, what is it? |
| 1644 | |
| 1645 | 1. skb was enqueued by tcp. |
| 1646 | 2. skb is added to tail of read queue, rather than out of order. |
| 1647 | 3. socket is not in passive state. |
| 1648 | 4. Finally, it really contains options, which user wants to receive. |
| 1649 | */ |
| 1650 | tp = tcp_sk(sk); |
| 1651 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && |
| 1652 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1653 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1654 | np->mcast_oif = inet6_iif(opt_skb); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1655 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1656 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | if (ipv6_opt_accepted(sk, opt_skb)) { |
| 1658 | skb_set_owner_r(opt_skb, sk); |
| 1659 | opt_skb = xchg(&np->pktoptions, opt_skb); |
| 1660 | } else { |
| 1661 | __kfree_skb(opt_skb); |
| 1662 | opt_skb = xchg(&np->pktoptions, NULL); |
| 1663 | } |
| 1664 | } |
| 1665 | |
| 1666 | if (opt_skb) |
| 1667 | kfree_skb(opt_skb); |
| 1668 | return 0; |
| 1669 | } |
| 1670 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 1671 | static int tcp_v6_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1673 | struct tcphdr *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | struct sock *sk; |
| 1675 | int ret; |
| 1676 | |
| 1677 | if (skb->pkt_type != PACKET_HOST) |
| 1678 | goto discard_it; |
| 1679 | |
| 1680 | /* |
| 1681 | * Count it even if it's bad. |
| 1682 | */ |
| 1683 | TCP_INC_STATS_BH(TCP_MIB_INSEGS); |
| 1684 | |
| 1685 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1686 | goto discard_it; |
| 1687 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1688 | th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | |
| 1690 | if (th->doff < sizeof(struct tcphdr)/4) |
| 1691 | goto bad_packet; |
| 1692 | if (!pskb_may_pull(skb, th->doff*4)) |
| 1693 | goto discard_it; |
| 1694 | |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 1695 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | goto bad_packet; |
| 1697 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1698 | th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1700 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1701 | skb->len - th->doff*4); |
| 1702 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
| 1703 | TCP_SKB_CB(skb)->when = 0; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1704 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | TCP_SKB_CB(skb)->sacked = 0; |
| 1706 | |
Pavel Emelyanov | d86e0da | 2008-01-31 05:07:21 -0800 | [diff] [blame] | 1707 | sk = __inet6_lookup(skb->dev->nd_net, &tcp_hashinfo, |
| 1708 | &ipv6_hdr(skb)->saddr, th->source, |
| 1709 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), |
| 1710 | inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | |
| 1712 | if (!sk) |
| 1713 | goto no_tcp_socket; |
| 1714 | |
| 1715 | process: |
| 1716 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1717 | goto do_time_wait; |
| 1718 | |
| 1719 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1720 | goto discard_and_relse; |
| 1721 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1722 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | goto discard_and_relse; |
| 1724 | |
| 1725 | skb->dev = NULL; |
| 1726 | |
Fabio Olive Leite | 293b9c4 | 2006-09-25 22:28:47 -0700 | [diff] [blame] | 1727 | bh_lock_sock_nested(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | ret = 0; |
| 1729 | if (!sock_owned_by_user(sk)) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1730 | #ifdef CONFIG_NET_DMA |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1731 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | b4caea8 | 2007-10-26 04:20:13 -0700 | [diff] [blame] | 1732 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
| 1733 | tp->ucopy.dma_chan = get_softnet_dma(); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1734 | if (tp->ucopy.dma_chan) |
| 1735 | ret = tcp_v6_do_rcv(sk, skb); |
| 1736 | else |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1737 | #endif |
| 1738 | { |
| 1739 | if (!tcp_prequeue(sk, skb)) |
| 1740 | ret = tcp_v6_do_rcv(sk, skb); |
| 1741 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | } else |
| 1743 | sk_add_backlog(sk, skb); |
| 1744 | bh_unlock_sock(sk); |
| 1745 | |
| 1746 | sock_put(sk); |
| 1747 | return ret ? -1 : 0; |
| 1748 | |
| 1749 | no_tcp_socket: |
| 1750 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1751 | goto discard_it; |
| 1752 | |
| 1753 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
| 1754 | bad_packet: |
| 1755 | TCP_INC_STATS_BH(TCP_MIB_INERRS); |
| 1756 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1757 | tcp_v6_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | } |
| 1759 | |
| 1760 | discard_it: |
| 1761 | |
| 1762 | /* |
| 1763 | * Discard frame |
| 1764 | */ |
| 1765 | |
| 1766 | kfree_skb(skb); |
| 1767 | return 0; |
| 1768 | |
| 1769 | discard_and_relse: |
| 1770 | sock_put(sk); |
| 1771 | goto discard_it; |
| 1772 | |
| 1773 | do_time_wait: |
| 1774 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1775 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | goto discard_it; |
| 1777 | } |
| 1778 | |
| 1779 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
| 1780 | TCP_INC_STATS_BH(TCP_MIB_INERRS); |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1781 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | goto discard_it; |
| 1783 | } |
| 1784 | |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1785 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | case TCP_TW_SYN: |
| 1787 | { |
| 1788 | struct sock *sk2; |
| 1789 | |
Pavel Emelyanov | d86e0da | 2008-01-31 05:07:21 -0800 | [diff] [blame] | 1790 | sk2 = inet6_lookup_listener(skb->dev->nd_net, &tcp_hashinfo, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1791 | &ipv6_hdr(skb)->daddr, |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1792 | ntohs(th->dest), inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | if (sk2 != NULL) { |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 1794 | struct inet_timewait_sock *tw = inet_twsk(sk); |
| 1795 | inet_twsk_deschedule(tw, &tcp_death_row); |
| 1796 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | sk = sk2; |
| 1798 | goto process; |
| 1799 | } |
| 1800 | /* Fall through to ACK */ |
| 1801 | } |
| 1802 | case TCP_TW_ACK: |
| 1803 | tcp_v6_timewait_ack(sk, skb); |
| 1804 | break; |
| 1805 | case TCP_TW_RST: |
| 1806 | goto no_tcp_socket; |
| 1807 | case TCP_TW_SUCCESS:; |
| 1808 | } |
| 1809 | goto discard_it; |
| 1810 | } |
| 1811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | static int tcp_v6_remember_stamp(struct sock *sk) |
| 1813 | { |
| 1814 | /* Alas, not yet... */ |
| 1815 | return 0; |
| 1816 | } |
| 1817 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1818 | static struct inet_connection_sock_af_ops ipv6_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1819 | .queue_xmit = inet6_csk_xmit, |
| 1820 | .send_check = tcp_v6_send_check, |
| 1821 | .rebuild_header = inet6_sk_rebuild_header, |
| 1822 | .conn_request = tcp_v6_conn_request, |
| 1823 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
| 1824 | .remember_stamp = tcp_v6_remember_stamp, |
| 1825 | .net_header_len = sizeof(struct ipv6hdr), |
| 1826 | .setsockopt = ipv6_setsockopt, |
| 1827 | .getsockopt = ipv6_getsockopt, |
| 1828 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
| 1829 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1830 | .bind_conflict = inet6_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1831 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1832 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 1833 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1834 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | }; |
| 1836 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1837 | #ifdef CONFIG_TCP_MD5SIG |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 1838 | static struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1839 | .md5_lookup = tcp_v6_md5_lookup, |
| 1840 | .calc_md5_hash = tcp_v6_calc_md5_hash, |
| 1841 | .md5_add = tcp_v6_md5_add_func, |
| 1842 | .md5_parse = tcp_v6_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1843 | }; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 1844 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1845 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1846 | /* |
| 1847 | * TCP over IPv4 via INET6 API |
| 1848 | */ |
| 1849 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1850 | static struct inet_connection_sock_af_ops ipv6_mapped = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1851 | .queue_xmit = ip_queue_xmit, |
| 1852 | .send_check = tcp_v4_send_check, |
| 1853 | .rebuild_header = inet_sk_rebuild_header, |
| 1854 | .conn_request = tcp_v6_conn_request, |
| 1855 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
| 1856 | .remember_stamp = tcp_v4_remember_stamp, |
| 1857 | .net_header_len = sizeof(struct iphdr), |
| 1858 | .setsockopt = ipv6_setsockopt, |
| 1859 | .getsockopt = ipv6_getsockopt, |
| 1860 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
| 1861 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1862 | .bind_conflict = inet6_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1863 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1864 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 1865 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1866 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | }; |
| 1868 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1869 | #ifdef CONFIG_TCP_MD5SIG |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 1870 | static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1871 | .md5_lookup = tcp_v4_md5_lookup, |
| 1872 | .calc_md5_hash = tcp_v4_calc_md5_hash, |
| 1873 | .md5_add = tcp_v6_md5_add_func, |
| 1874 | .md5_parse = tcp_v6_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1875 | }; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 1876 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1877 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | /* NOTE: A lot of things set to zero explicitly by call to |
| 1879 | * sk_alloc() so need not be done here. |
| 1880 | */ |
| 1881 | static int tcp_v6_init_sock(struct sock *sk) |
| 1882 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1883 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | struct tcp_sock *tp = tcp_sk(sk); |
| 1885 | |
| 1886 | skb_queue_head_init(&tp->out_of_order_queue); |
| 1887 | tcp_init_xmit_timers(sk); |
| 1888 | tcp_prequeue_init(tp); |
| 1889 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1890 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | tp->mdev = TCP_TIMEOUT_INIT; |
| 1892 | |
| 1893 | /* So many TCP implementations out there (incorrectly) count the |
| 1894 | * initial SYN frame in their delayed-ACK and congestion control |
| 1895 | * algorithms that we must have the following bandaid to talk |
| 1896 | * efficiently to them. -DaveM |
| 1897 | */ |
| 1898 | tp->snd_cwnd = 2; |
| 1899 | |
| 1900 | /* See draft-stevens-tcpca-spec-01 for discussion of the |
| 1901 | * initialization of these values. |
| 1902 | */ |
| 1903 | tp->snd_ssthresh = 0x7fffffff; |
| 1904 | tp->snd_cwnd_clamp = ~0; |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 1905 | tp->mss_cache = 536; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | |
| 1907 | tp->reordering = sysctl_tcp_reordering; |
| 1908 | |
| 1909 | sk->sk_state = TCP_CLOSE; |
| 1910 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1911 | icsk->icsk_af_ops = &ipv6_specific; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1912 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1913 | icsk->icsk_sync_mss = tcp_sync_mss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | sk->sk_write_space = sk_stream_write_space; |
| 1915 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); |
| 1916 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1917 | #ifdef CONFIG_TCP_MD5SIG |
| 1918 | tp->af_specific = &tcp_sock_ipv6_specific; |
| 1919 | #endif |
| 1920 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
| 1922 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; |
| 1923 | |
| 1924 | atomic_inc(&tcp_sockets_allocated); |
| 1925 | |
| 1926 | return 0; |
| 1927 | } |
| 1928 | |
| 1929 | static int tcp_v6_destroy_sock(struct sock *sk) |
| 1930 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1931 | #ifdef CONFIG_TCP_MD5SIG |
| 1932 | /* Clean up the MD5 key list */ |
| 1933 | if (tcp_sk(sk)->md5sig_info) |
| 1934 | tcp_v6_clear_md5_list(sk); |
| 1935 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | tcp_v4_destroy_sock(sk); |
| 1937 | return inet6_destroy_sock(sk); |
| 1938 | } |
| 1939 | |
YOSHIFUJI Hideaki | 952a10b | 2007-04-21 20:13:44 +0900 | [diff] [blame] | 1940 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | /* Proc filesystem TCPv6 sock list dumping. */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1942 | static void get_openreq6(struct seq_file *seq, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1943 | struct sock *sk, struct request_sock *req, int i, int uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1944 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | int ttd = req->expires - jiffies; |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1946 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
| 1947 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | |
| 1949 | if (ttd < 0) |
| 1950 | ttd = 0; |
| 1951 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | seq_printf(seq, |
| 1953 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| 1954 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", |
| 1955 | i, |
| 1956 | src->s6_addr32[0], src->s6_addr32[1], |
| 1957 | src->s6_addr32[2], src->s6_addr32[3], |
| 1958 | ntohs(inet_sk(sk)->sport), |
| 1959 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1960 | dest->s6_addr32[2], dest->s6_addr32[3], |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1961 | ntohs(inet_rsk(req)->rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | TCP_SYN_RECV, |
| 1963 | 0,0, /* could print option size, but that is af dependent. */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1964 | 1, /* timers active (only the expire timer) */ |
| 1965 | jiffies_to_clock_t(ttd), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | req->retrans, |
| 1967 | uid, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1968 | 0, /* non standard timer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | 0, /* open_requests have no inode */ |
| 1970 | 0, req); |
| 1971 | } |
| 1972 | |
| 1973 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) |
| 1974 | { |
| 1975 | struct in6_addr *dest, *src; |
| 1976 | __u16 destp, srcp; |
| 1977 | int timer_active; |
| 1978 | unsigned long timer_expires; |
| 1979 | struct inet_sock *inet = inet_sk(sp); |
| 1980 | struct tcp_sock *tp = tcp_sk(sp); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1981 | const struct inet_connection_sock *icsk = inet_csk(sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | struct ipv6_pinfo *np = inet6_sk(sp); |
| 1983 | |
| 1984 | dest = &np->daddr; |
| 1985 | src = &np->rcv_saddr; |
| 1986 | destp = ntohs(inet->dport); |
| 1987 | srcp = ntohs(inet->sport); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1988 | |
| 1989 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1991 | timer_expires = icsk->icsk_timeout; |
| 1992 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1993 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1994 | timer_expires = icsk->icsk_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | } else if (timer_pending(&sp->sk_timer)) { |
| 1996 | timer_active = 2; |
| 1997 | timer_expires = sp->sk_timer.expires; |
| 1998 | } else { |
| 1999 | timer_active = 0; |
| 2000 | timer_expires = jiffies; |
| 2001 | } |
| 2002 | |
| 2003 | seq_printf(seq, |
| 2004 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| 2005 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", |
| 2006 | i, |
| 2007 | src->s6_addr32[0], src->s6_addr32[1], |
| 2008 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 2009 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 2010 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2011 | sp->sk_state, |
Sridhar Samudrala | 47da8ee | 2006-06-27 13:29:00 -0700 | [diff] [blame] | 2012 | tp->write_seq-tp->snd_una, |
| 2013 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | timer_active, |
| 2015 | jiffies_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2016 | icsk->icsk_retransmits, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | sock_i_uid(sp), |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2018 | icsk->icsk_probes_out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | sock_i_ino(sp), |
| 2020 | atomic_read(&sp->sk_refcnt), sp, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2021 | icsk->icsk_rto, |
| 2022 | icsk->icsk_ack.ato, |
| 2023 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
| 2025 | ); |
| 2026 | } |
| 2027 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2028 | static void get_timewait6_sock(struct seq_file *seq, |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2029 | struct inet_timewait_sock *tw, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | { |
| 2031 | struct in6_addr *dest, *src; |
| 2032 | __u16 destp, srcp; |
Arnaldo Carvalho de Melo | 0fa1a53 | 2005-12-13 23:23:09 -0800 | [diff] [blame] | 2033 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | int ttd = tw->tw_ttd - jiffies; |
| 2035 | |
| 2036 | if (ttd < 0) |
| 2037 | ttd = 0; |
| 2038 | |
Arnaldo Carvalho de Melo | 0fa1a53 | 2005-12-13 23:23:09 -0800 | [diff] [blame] | 2039 | dest = &tw6->tw_v6_daddr; |
| 2040 | src = &tw6->tw_v6_rcv_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | destp = ntohs(tw->tw_dport); |
| 2042 | srcp = ntohs(tw->tw_sport); |
| 2043 | |
| 2044 | seq_printf(seq, |
| 2045 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| 2046 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", |
| 2047 | i, |
| 2048 | src->s6_addr32[0], src->s6_addr32[1], |
| 2049 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 2050 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 2051 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
| 2052 | tw->tw_substate, 0, 0, |
| 2053 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, |
| 2054 | atomic_read(&tw->tw_refcnt), tw); |
| 2055 | } |
| 2056 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
| 2058 | { |
| 2059 | struct tcp_iter_state *st; |
| 2060 | |
| 2061 | if (v == SEQ_START_TOKEN) { |
| 2062 | seq_puts(seq, |
| 2063 | " sl " |
| 2064 | "local_address " |
| 2065 | "remote_address " |
| 2066 | "st tx_queue rx_queue tr tm->when retrnsmt" |
| 2067 | " uid timeout inode\n"); |
| 2068 | goto out; |
| 2069 | } |
| 2070 | st = seq->private; |
| 2071 | |
| 2072 | switch (st->state) { |
| 2073 | case TCP_SEQ_STATE_LISTENING: |
| 2074 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2075 | get_tcp6_sock(seq, v, st->num); |
| 2076 | break; |
| 2077 | case TCP_SEQ_STATE_OPENREQ: |
| 2078 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); |
| 2079 | break; |
| 2080 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2081 | get_timewait6_sock(seq, v, st->num); |
| 2082 | break; |
| 2083 | } |
| 2084 | out: |
| 2085 | return 0; |
| 2086 | } |
| 2087 | |
| 2088 | static struct file_operations tcp6_seq_fops; |
| 2089 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
| 2090 | .owner = THIS_MODULE, |
| 2091 | .name = "tcp6", |
| 2092 | .family = AF_INET6, |
| 2093 | .seq_show = tcp6_seq_show, |
| 2094 | .seq_fops = &tcp6_seq_fops, |
| 2095 | }; |
| 2096 | |
| 2097 | int __init tcp6_proc_init(void) |
| 2098 | { |
| 2099 | return tcp_proc_register(&tcp6_seq_afinfo); |
| 2100 | } |
| 2101 | |
| 2102 | void tcp6_proc_exit(void) |
| 2103 | { |
| 2104 | tcp_proc_unregister(&tcp6_seq_afinfo); |
| 2105 | } |
| 2106 | #endif |
| 2107 | |
Eric Dumazet | c5a432f | 2007-11-05 23:39:51 -0800 | [diff] [blame] | 2108 | DEFINE_PROTO_INUSE(tcpv6) |
| 2109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | struct proto tcpv6_prot = { |
| 2111 | .name = "TCPv6", |
| 2112 | .owner = THIS_MODULE, |
| 2113 | .close = tcp_close, |
| 2114 | .connect = tcp_v6_connect, |
| 2115 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2116 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | .ioctl = tcp_ioctl, |
| 2118 | .init = tcp_v6_init_sock, |
| 2119 | .destroy = tcp_v6_destroy_sock, |
| 2120 | .shutdown = tcp_shutdown, |
| 2121 | .setsockopt = tcp_setsockopt, |
| 2122 | .getsockopt = tcp_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | .recvmsg = tcp_recvmsg, |
| 2124 | .backlog_rcv = tcp_v6_do_rcv, |
| 2125 | .hash = tcp_v6_hash, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2126 | .unhash = inet_unhash, |
| 2127 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | .enter_memory_pressure = tcp_enter_memory_pressure, |
| 2129 | .sockets_allocated = &tcp_sockets_allocated, |
| 2130 | .memory_allocated = &tcp_memory_allocated, |
| 2131 | .memory_pressure = &tcp_memory_pressure, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2132 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | .sysctl_mem = sysctl_tcp_mem, |
| 2134 | .sysctl_wmem = sysctl_tcp_wmem, |
| 2135 | .sysctl_rmem = sysctl_tcp_rmem, |
| 2136 | .max_header = MAX_TCP_HEADER, |
| 2137 | .obj_size = sizeof(struct tcp6_sock), |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2138 | .twsk_prot = &tcp6_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2139 | .rsk_prot = &tcp6_request_sock_ops, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2140 | .hashinfo = &tcp_hashinfo, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2141 | #ifdef CONFIG_COMPAT |
| 2142 | .compat_setsockopt = compat_tcp_setsockopt, |
| 2143 | .compat_getsockopt = compat_tcp_getsockopt, |
| 2144 | #endif |
Eric Dumazet | c5a432f | 2007-11-05 23:39:51 -0800 | [diff] [blame] | 2145 | REF_PROTO_INUSE(tcpv6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | }; |
| 2147 | |
| 2148 | static struct inet6_protocol tcpv6_protocol = { |
| 2149 | .handler = tcp_v6_rcv, |
| 2150 | .err_handler = tcp_v6_err, |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 2151 | .gso_send_check = tcp_v6_gso_send_check, |
Herbert Xu | adcfc7d | 2006-06-30 13:36:15 -0700 | [diff] [blame] | 2152 | .gso_segment = tcp_tso_segment, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| 2154 | }; |
| 2155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | static struct inet_protosw tcpv6_protosw = { |
| 2157 | .type = SOCK_STREAM, |
| 2158 | .protocol = IPPROTO_TCP, |
| 2159 | .prot = &tcpv6_prot, |
| 2160 | .ops = &inet6_stream_ops, |
| 2161 | .capability = -1, |
| 2162 | .no_check = 0, |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 2163 | .flags = INET_PROTOSW_PERMANENT | |
| 2164 | INET_PROTOSW_ICSK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | }; |
| 2166 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2167 | int __init tcpv6_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | { |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2169 | int ret; |
David Woodhouse | ae0f7d5 | 2006-01-11 15:53:04 -0800 | [diff] [blame] | 2170 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2171 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
| 2172 | if (ret) |
| 2173 | goto out; |
| 2174 | |
| 2175 | /* register inet6 protocol */ |
| 2176 | ret = inet6_register_protosw(&tcpv6_protosw); |
| 2177 | if (ret) |
| 2178 | goto out_tcpv6_protocol; |
| 2179 | |
| 2180 | ret = inet_csk_ctl_sock_create(&tcp6_socket, PF_INET6, |
| 2181 | SOCK_RAW, IPPROTO_TCP); |
| 2182 | if (ret) |
| 2183 | goto out_tcpv6_protosw; |
| 2184 | out: |
| 2185 | return ret; |
| 2186 | |
| 2187 | out_tcpv6_protocol: |
| 2188 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
| 2189 | out_tcpv6_protosw: |
| 2190 | inet6_unregister_protosw(&tcpv6_protosw); |
| 2191 | goto out; |
| 2192 | } |
| 2193 | |
Daniel Lezcano | 09f7709 | 2007-12-13 05:34:58 -0800 | [diff] [blame] | 2194 | void tcpv6_exit(void) |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2195 | { |
| 2196 | sock_release(tcp6_socket); |
| 2197 | inet6_unregister_protosw(&tcpv6_protosw); |
| 2198 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2199 | } |