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 | * |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 8 | * Based on: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * linux/net/ipv4/tcp.c |
| 10 | * linux/net/ipv4/tcp_input.c |
| 11 | * linux/net/ipv4/tcp_output.c |
| 12 | * |
| 13 | * Fixes: |
| 14 | * Hideaki YOSHIFUJI : sin6_scope_id support |
| 15 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| 16 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| 17 | * a single port at the same time. |
| 18 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. |
| 19 | * |
| 20 | * This program is free software; you can redistribute it and/or |
| 21 | * modify it under the terms of the GNU General Public License |
| 22 | * as published by the Free Software Foundation; either version |
| 23 | * 2 of the License, or (at your option) any later version. |
| 24 | */ |
| 25 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 26 | #include <linux/bottom_half.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/errno.h> |
| 29 | #include <linux/types.h> |
| 30 | #include <linux/socket.h> |
| 31 | #include <linux/sockios.h> |
| 32 | #include <linux/net.h> |
| 33 | #include <linux/jiffies.h> |
| 34 | #include <linux/in.h> |
| 35 | #include <linux/in6.h> |
| 36 | #include <linux/netdevice.h> |
| 37 | #include <linux/init.h> |
| 38 | #include <linux/jhash.h> |
| 39 | #include <linux/ipsec.h> |
| 40 | #include <linux/times.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 41 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Denis V. Lunev | 3d58b5f | 2008-04-03 14:22:32 -0700 | [diff] [blame] | 63 | #include <net/inet_common.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
| 65 | #include <asm/uaccess.h> |
| 66 | |
| 67 | #include <linux/proc_fs.h> |
| 68 | #include <linux/seq_file.h> |
| 69 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 70 | #include <linux/crypto.h> |
| 71 | #include <linux/scatterlist.h> |
| 72 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 73 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 74 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
| 75 | struct request_sock *req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 78 | static void __tcp_v6_send_check(struct sk_buff *skb, |
| 79 | struct in6_addr *saddr, |
| 80 | struct in6_addr *daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 82 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
| 83 | static const 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 |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 85 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
| 86 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 87 | #else |
| 88 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, |
| 89 | struct in6_addr *addr) |
| 90 | { |
| 91 | return NULL; |
| 92 | } |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 93 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | static void tcp_v6_hash(struct sock *sk) |
| 96 | { |
| 97 | if (sk->sk_state != TCP_CLOSE) { |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 98 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | tcp_prot.hash(sk); |
| 100 | return; |
| 101 | } |
| 102 | local_bh_disable(); |
Eric Dumazet | 9327f70 | 2009-12-04 03:46:54 +0000 | [diff] [blame] | 103 | __inet6_hash(sk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | local_bh_enable(); |
| 105 | } |
| 106 | } |
| 107 | |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 108 | static __inline__ __sum16 tcp_v6_check(int len, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 109 | struct in6_addr *saddr, |
| 110 | struct in6_addr *daddr, |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 111 | __wsum base) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
| 113 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); |
| 114 | } |
| 115 | |
Gerrit Renker | a94f723 | 2006-11-10 14:06:49 -0800 | [diff] [blame] | 116 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 118 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
| 119 | ipv6_hdr(skb)->saddr.s6_addr32, |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 120 | tcp_hdr(skb)->dest, |
| 121 | tcp_hdr(skb)->source); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 124 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | int addr_len) |
| 126 | { |
| 127 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 128 | struct inet_sock *inet = inet_sk(sk); |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 129 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 131 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 132 | struct in6_addr *saddr = NULL, *final_p, final; |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 133 | struct rt6_info *rt; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 134 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | struct dst_entry *dst; |
| 136 | int addr_type; |
| 137 | int err; |
| 138 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 139 | if (addr_len < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | return -EINVAL; |
| 141 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 142 | if (usin->sin6_family != AF_INET6) |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 143 | return -EAFNOSUPPORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 145 | memset(&fl6, 0, sizeof(fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
| 147 | if (np->sndflow) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 148 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| 149 | IP6_ECN_flow_init(fl6.flowlabel); |
| 150 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | struct ip6_flowlabel *flowlabel; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 152 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | if (flowlabel == NULL) |
| 154 | return -EINVAL; |
| 155 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); |
| 156 | fl6_sock_release(flowlabel); |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 161 | * connect() to INADDR_ANY means loopback (BSD'ism). |
| 162 | */ |
| 163 | |
| 164 | if(ipv6_addr_any(&usin->sin6_addr)) |
| 165 | usin->sin6_addr.s6_addr[15] = 0x1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
| 167 | addr_type = ipv6_addr_type(&usin->sin6_addr); |
| 168 | |
| 169 | if(addr_type & IPV6_ADDR_MULTICAST) |
| 170 | return -ENETUNREACH; |
| 171 | |
| 172 | if (addr_type&IPV6_ADDR_LINKLOCAL) { |
| 173 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 174 | usin->sin6_scope_id) { |
| 175 | /* If interface is set while binding, indices |
| 176 | * must coincide. |
| 177 | */ |
| 178 | if (sk->sk_bound_dev_if && |
| 179 | sk->sk_bound_dev_if != usin->sin6_scope_id) |
| 180 | return -EINVAL; |
| 181 | |
| 182 | sk->sk_bound_dev_if = usin->sin6_scope_id; |
| 183 | } |
| 184 | |
| 185 | /* Connect to link-local address requires an interface */ |
| 186 | if (!sk->sk_bound_dev_if) |
| 187 | return -EINVAL; |
| 188 | } |
| 189 | |
| 190 | if (tp->rx_opt.ts_recent_stamp && |
| 191 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { |
| 192 | tp->rx_opt.ts_recent = 0; |
| 193 | tp->rx_opt.ts_recent_stamp = 0; |
| 194 | tp->write_seq = 0; |
| 195 | } |
| 196 | |
| 197 | ipv6_addr_copy(&np->daddr, &usin->sin6_addr); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 198 | np->flow_label = fl6.flowlabel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | /* |
| 201 | * TCP over IPv4 |
| 202 | */ |
| 203 | |
| 204 | if (addr_type == IPV6_ADDR_MAPPED) { |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 205 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | struct sockaddr_in sin; |
| 207 | |
| 208 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); |
| 209 | |
| 210 | if (__ipv6_only_sock(sk)) |
| 211 | return -ENETUNREACH; |
| 212 | |
| 213 | sin.sin_family = AF_INET; |
| 214 | sin.sin_port = usin->sin6_port; |
| 215 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
| 216 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 217 | icsk->icsk_af_ops = &ipv6_mapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 219 | #ifdef CONFIG_TCP_MD5SIG |
| 220 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; |
| 221 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); |
| 224 | |
| 225 | if (err) { |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 226 | icsk->icsk_ext_hdr_len = exthdrlen; |
| 227 | icsk->icsk_af_ops = &ipv6_specific; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 229 | #ifdef CONFIG_TCP_MD5SIG |
| 230 | tp->af_specific = &tcp_sock_ipv6_specific; |
| 231 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | goto failure; |
| 233 | } else { |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 234 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
| 235 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
| 236 | &np->rcv_saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | return err; |
| 240 | } |
| 241 | |
| 242 | if (!ipv6_addr_any(&np->rcv_saddr)) |
| 243 | saddr = &np->rcv_saddr; |
| 244 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 245 | fl6.flowi6_proto = IPPROTO_TCP; |
| 246 | ipv6_addr_copy(&fl6.daddr, &np->daddr); |
| 247 | ipv6_addr_copy(&fl6.saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | (saddr ? saddr : &np->saddr)); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 249 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
| 250 | fl6.flowi6_mark = sk->sk_mark; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 251 | fl6.fl6_dport = usin->sin6_port; |
| 252 | fl6.fl6_sport = inet->inet_sport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 254 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 256 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 257 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 258 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 259 | if (IS_ERR(dst)) { |
| 260 | err = PTR_ERR(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | goto failure; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 262 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
| 264 | if (saddr == NULL) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 265 | saddr = &fl6.saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | ipv6_addr_copy(&np->rcv_saddr, saddr); |
| 267 | } |
| 268 | |
| 269 | /* set the source address */ |
| 270 | ipv6_addr_copy(&np->saddr, saddr); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 271 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
Herbert Xu | f83ef8c | 2006-06-30 13:37:03 -0700 | [diff] [blame] | 273 | sk->sk_gso_type = SKB_GSO_TCPV6; |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 274 | __ip6_dst_store(sk, dst, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 276 | rt = (struct rt6_info *) dst; |
| 277 | if (tcp_death_row.sysctl_tw_recycle && |
| 278 | !tp->rx_opt.ts_recent_stamp && |
| 279 | ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) { |
| 280 | struct inet_peer *peer = rt6_get_peer(rt); |
| 281 | /* |
| 282 | * VJ's idea. We save last timestamp seen from |
| 283 | * the destination in peer table, when entering state |
| 284 | * TIME-WAIT * and initialize rx_opt.ts_recent from it, |
| 285 | * when trying new connection. |
| 286 | */ |
| 287 | if (peer) { |
| 288 | inet_peer_refcheck(peer); |
| 289 | if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) { |
| 290 | tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; |
| 291 | tp->rx_opt.ts_recent = peer->tcp_ts; |
| 292 | } |
| 293 | } |
| 294 | } |
| 295 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 296 | icsk->icsk_ext_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | if (np->opt) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 298 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
| 299 | np->opt->opt_nflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
| 301 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| 302 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 303 | inet->inet_dport = usin->sin6_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | tcp_set_state(sk, TCP_SYN_SENT); |
Arnaldo Carvalho de Melo | d8313f5 | 2005-12-13 23:25:44 -0800 | [diff] [blame] | 306 | err = inet6_hash_connect(&tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | if (err) |
| 308 | goto late_failure; |
| 309 | |
| 310 | if (!tp->write_seq) |
| 311 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
| 312 | np->daddr.s6_addr32, |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 313 | inet->inet_sport, |
| 314 | inet->inet_dport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
| 316 | err = tcp_connect(sk); |
| 317 | if (err) |
| 318 | goto late_failure; |
| 319 | |
| 320 | return 0; |
| 321 | |
| 322 | late_failure: |
| 323 | tcp_set_state(sk, TCP_CLOSE); |
| 324 | __sk_dst_reset(sk); |
| 325 | failure: |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 326 | inet->inet_dport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | sk->sk_route_caps = 0; |
| 328 | return err; |
| 329 | } |
| 330 | |
| 331 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
Brian Haley | d5fdd6b | 2009-06-23 04:31:07 -0700 | [diff] [blame] | 332 | u8 type, u8 code, int offset, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | { |
| 334 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 335 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | struct ipv6_pinfo *np; |
| 337 | struct sock *sk; |
| 338 | int err; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 339 | struct tcp_sock *tp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | __u32 seq; |
Pavel Emelyanov | ca12a1a | 2008-07-16 20:28:42 -0700 | [diff] [blame] | 341 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Pavel Emelyanov | ca12a1a | 2008-07-16 20:28:42 -0700 | [diff] [blame] | 343 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
Pavel Emelyanov | d86e0da | 2008-01-31 05:07:21 -0800 | [diff] [blame] | 344 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
| 346 | if (sk == NULL) { |
Denis V. Lunev | e41b536 | 2008-10-08 10:33:26 -0700 | [diff] [blame] | 347 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
| 348 | ICMP6_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | return; |
| 350 | } |
| 351 | |
| 352 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 353 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | return; |
| 355 | } |
| 356 | |
| 357 | bh_lock_sock(sk); |
| 358 | if (sock_owned_by_user(sk)) |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 359 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | if (sk->sk_state == TCP_CLOSE) |
| 362 | goto out; |
| 363 | |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 364 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
| 365 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
| 366 | goto out; |
| 367 | } |
| 368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | tp = tcp_sk(sk); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 370 | seq = ntohl(th->seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | if (sk->sk_state != TCP_LISTEN && |
| 372 | !between(seq, tp->snd_una, tp->snd_nxt)) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 373 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | goto out; |
| 375 | } |
| 376 | |
| 377 | np = inet6_sk(sk); |
| 378 | |
| 379 | if (type == ICMPV6_PKT_TOOBIG) { |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 380 | struct dst_entry *dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | if (sock_owned_by_user(sk)) |
| 383 | goto out; |
| 384 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) |
| 385 | goto out; |
| 386 | |
| 387 | /* icmp should have updated the destination cache entry */ |
| 388 | dst = __sk_dst_check(sk, np->dst_cookie); |
| 389 | |
| 390 | if (dst == NULL) { |
| 391 | struct inet_sock *inet = inet_sk(sk); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 392 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
| 394 | /* BUGGG_FUTURE: Again, it is not clear how |
| 395 | to handle rthdr case. Ignore this complexity |
| 396 | for now. |
| 397 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 398 | memset(&fl6, 0, sizeof(fl6)); |
| 399 | fl6.flowi6_proto = IPPROTO_TCP; |
| 400 | ipv6_addr_copy(&fl6.daddr, &np->daddr); |
| 401 | ipv6_addr_copy(&fl6.saddr, &np->saddr); |
| 402 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
| 403 | fl6.flowi6_mark = sk->sk_mark; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 404 | fl6.fl6_dport = inet->inet_dport; |
| 405 | fl6.fl6_sport = inet->inet_sport; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 406 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 408 | dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 409 | if (IS_ERR(dst)) { |
| 410 | sk->sk_err_soft = -PTR_ERR(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | goto out; |
| 412 | } |
| 413 | |
| 414 | } else |
| 415 | dst_hold(dst); |
| 416 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 417 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | tcp_sync_mss(sk, dst_mtu(dst)); |
| 419 | tcp_simple_retransmit(sk); |
| 420 | } /* else let the usual retransmit timer handle it */ |
| 421 | dst_release(dst); |
| 422 | goto out; |
| 423 | } |
| 424 | |
| 425 | icmpv6_err_convert(type, code, &err); |
| 426 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 427 | /* Might be for an request_sock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | switch (sk->sk_state) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 429 | struct request_sock *req, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | case TCP_LISTEN: |
| 431 | if (sock_owned_by_user(sk)) |
| 432 | goto out; |
| 433 | |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 434 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
| 435 | &hdr->saddr, inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | if (!req) |
| 437 | goto out; |
| 438 | |
| 439 | /* ICMPs are not backlogged, hence we cannot get |
| 440 | * an established socket here. |
| 441 | */ |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 442 | WARN_ON(req->sk != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 444 | if (seq != tcp_rsk(req)->snt_isn) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 445 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | goto out; |
| 447 | } |
| 448 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 449 | inet_csk_reqsk_queue_drop(sk, req, prev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | goto out; |
| 451 | |
| 452 | case TCP_SYN_SENT: |
| 453 | case TCP_SYN_RECV: /* Cannot happen. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 454 | It can, it SYNs are crossed. --ANK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | sk->sk_err = err; |
| 457 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ |
| 458 | |
| 459 | tcp_done(sk); |
| 460 | } else |
| 461 | sk->sk_err_soft = err; |
| 462 | goto out; |
| 463 | } |
| 464 | |
| 465 | if (!sock_owned_by_user(sk) && np->recverr) { |
| 466 | sk->sk_err = err; |
| 467 | sk->sk_error_report(sk); |
| 468 | } else |
| 469 | sk->sk_err_soft = err; |
| 470 | |
| 471 | out: |
| 472 | bh_unlock_sock(sk); |
| 473 | sock_put(sk); |
| 474 | } |
| 475 | |
| 476 | |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 477 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
| 478 | struct request_values *rvp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | { |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 480 | struct inet6_request_sock *treq = inet6_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 482 | struct sk_buff * skb; |
| 483 | struct ipv6_txoptions *opt = NULL; |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 484 | struct in6_addr * final_p, final; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 485 | struct flowi6 fl6; |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 486 | struct dst_entry *dst; |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 487 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 489 | memset(&fl6, 0, sizeof(fl6)); |
| 490 | fl6.flowi6_proto = IPPROTO_TCP; |
| 491 | ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr); |
| 492 | ipv6_addr_copy(&fl6.saddr, &treq->loc_addr); |
| 493 | fl6.flowlabel = 0; |
| 494 | fl6.flowi6_oif = treq->iif; |
| 495 | fl6.flowi6_mark = sk->sk_mark; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 496 | fl6.fl6_dport = inet_rsk(req)->rmt_port; |
| 497 | fl6.fl6_sport = inet_rsk(req)->loc_port; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 498 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 500 | opt = np->opt; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 501 | final_p = fl6_update_dst(&fl6, opt, &final); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 503 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 504 | if (IS_ERR(dst)) { |
| 505 | err = PTR_ERR(dst); |
Boris Ostrovsky | 738faca | 2011-04-04 13:07:26 -0700 | [diff] [blame] | 506 | dst = NULL; |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 507 | goto done; |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 508 | } |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 509 | skb = tcp_make_synack(sk, dst, req, rvp); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 510 | err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | if (skb) { |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 512 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 514 | ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr); |
| 515 | err = ip6_xmit(sk, skb, &fl6, opt); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 516 | err = net_xmit_eval(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | } |
| 518 | |
| 519 | done: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 520 | if (opt && opt != np->opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | sock_kfree_s(sk, opt, opt->tot_len); |
Eric W. Biederman | 78b9104 | 2006-01-31 17:51:44 -0800 | [diff] [blame] | 522 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | return err; |
| 524 | } |
| 525 | |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 526 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, |
| 527 | struct request_values *rvp) |
| 528 | { |
| 529 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); |
| 530 | return tcp_v6_send_synack(sk, req, rvp); |
| 531 | } |
| 532 | |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 533 | static inline void syn_flood_warning(struct sk_buff *skb) |
| 534 | { |
| 535 | #ifdef CONFIG_SYN_COOKIES |
| 536 | if (sysctl_tcp_syncookies) |
| 537 | printk(KERN_INFO |
| 538 | "TCPv6: Possible SYN flooding on port %d. " |
| 539 | "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); |
| 540 | else |
| 541 | #endif |
| 542 | printk(KERN_INFO |
| 543 | "TCPv6: Possible SYN flooding on port %d. " |
| 544 | "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); |
| 545 | } |
| 546 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 547 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | { |
Wei Yongjun | 800d55f | 2009-02-23 21:45:33 +0000 | [diff] [blame] | 549 | kfree_skb(inet6_rsk(req)->pktopts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } |
| 551 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 552 | #ifdef CONFIG_TCP_MD5SIG |
| 553 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, |
| 554 | struct in6_addr *addr) |
| 555 | { |
| 556 | struct tcp_sock *tp = tcp_sk(sk); |
| 557 | int i; |
| 558 | |
| 559 | BUG_ON(tp == NULL); |
| 560 | |
| 561 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) |
| 562 | return NULL; |
| 563 | |
| 564 | for (i = 0; i < tp->md5sig_info->entries6; i++) { |
YOSHIFUJI Hideaki | caad295 | 2008-04-10 15:42:07 +0900 | [diff] [blame] | 565 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 566 | return &tp->md5sig_info->keys6[i].base; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 567 | } |
| 568 | return NULL; |
| 569 | } |
| 570 | |
| 571 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, |
| 572 | struct sock *addr_sk) |
| 573 | { |
| 574 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); |
| 575 | } |
| 576 | |
| 577 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, |
| 578 | struct request_sock *req) |
| 579 | { |
| 580 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); |
| 581 | } |
| 582 | |
| 583 | static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, |
| 584 | char *newkey, u8 newkeylen) |
| 585 | { |
| 586 | /* Add key to the list */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 587 | struct tcp_md5sig_key *key; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 588 | struct tcp_sock *tp = tcp_sk(sk); |
| 589 | struct tcp6_md5sig_key *keys; |
| 590 | |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 591 | key = tcp_v6_md5_do_lookup(sk, peer); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 592 | if (key) { |
| 593 | /* modify existing entry - just update that one */ |
Matthias M. Dellweg | b0a713e | 2007-10-29 20:55:27 -0700 | [diff] [blame] | 594 | kfree(key->key); |
| 595 | key->key = newkey; |
| 596 | key->keylen = newkeylen; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 597 | } else { |
| 598 | /* reallocate new list if current one is full. */ |
| 599 | if (!tp->md5sig_info) { |
| 600 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); |
| 601 | if (!tp->md5sig_info) { |
| 602 | kfree(newkey); |
| 603 | return -ENOMEM; |
| 604 | } |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 605 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 606 | } |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 607 | if (tcp_alloc_md5sig_pool(sk) == NULL) { |
YOSHIFUJI Hideaki | aacbe8c | 2007-11-20 17:30:56 -0800 | [diff] [blame] | 608 | kfree(newkey); |
| 609 | return -ENOMEM; |
| 610 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 611 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
| 612 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * |
| 613 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); |
| 614 | |
| 615 | if (!keys) { |
| 616 | tcp_free_md5sig_pool(); |
| 617 | kfree(newkey); |
| 618 | return -ENOMEM; |
| 619 | } |
| 620 | |
| 621 | if (tp->md5sig_info->entries6) |
| 622 | memmove(keys, tp->md5sig_info->keys6, |
| 623 | (sizeof (tp->md5sig_info->keys6[0]) * |
| 624 | tp->md5sig_info->entries6)); |
| 625 | |
| 626 | kfree(tp->md5sig_info->keys6); |
| 627 | tp->md5sig_info->keys6 = keys; |
| 628 | tp->md5sig_info->alloced6++; |
| 629 | } |
| 630 | |
| 631 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, |
| 632 | peer); |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 633 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
| 634 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 635 | |
| 636 | tp->md5sig_info->entries6++; |
| 637 | } |
| 638 | return 0; |
| 639 | } |
| 640 | |
| 641 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, |
| 642 | u8 *newkey, __u8 newkeylen) |
| 643 | { |
| 644 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, |
| 645 | newkey, newkeylen); |
| 646 | } |
| 647 | |
| 648 | static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) |
| 649 | { |
| 650 | struct tcp_sock *tp = tcp_sk(sk); |
| 651 | int i; |
| 652 | |
| 653 | for (i = 0; i < tp->md5sig_info->entries6; i++) { |
YOSHIFUJI Hideaki | caad295 | 2008-04-10 15:42:07 +0900 | [diff] [blame] | 654 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 655 | /* Free the key */ |
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--; |
| 658 | |
| 659 | if (tp->md5sig_info->entries6 == 0) { |
| 660 | kfree(tp->md5sig_info->keys6); |
| 661 | tp->md5sig_info->keys6 = NULL; |
YOSHIFUJI Hideaki | ca983ce | 2007-07-24 15:27:30 -0700 | [diff] [blame] | 662 | tp->md5sig_info->alloced6 = 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 663 | } else { |
| 664 | /* shrink the database */ |
| 665 | if (tp->md5sig_info->entries6 != i) |
| 666 | memmove(&tp->md5sig_info->keys6[i], |
| 667 | &tp->md5sig_info->keys6[i+1], |
| 668 | (tp->md5sig_info->entries6 - i) |
| 669 | * sizeof (tp->md5sig_info->keys6[0])); |
| 670 | } |
YOSHIFUJI Hideaki | 77adefd | 2007-11-20 17:31:23 -0800 | [diff] [blame] | 671 | tcp_free_md5sig_pool(); |
| 672 | return 0; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 673 | } |
| 674 | } |
| 675 | return -ENOENT; |
| 676 | } |
| 677 | |
| 678 | static void tcp_v6_clear_md5_list (struct sock *sk) |
| 679 | { |
| 680 | struct tcp_sock *tp = tcp_sk(sk); |
| 681 | int i; |
| 682 | |
| 683 | if (tp->md5sig_info->entries6) { |
| 684 | for (i = 0; i < tp->md5sig_info->entries6; i++) |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 685 | kfree(tp->md5sig_info->keys6[i].base.key); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 686 | tp->md5sig_info->entries6 = 0; |
| 687 | tcp_free_md5sig_pool(); |
| 688 | } |
| 689 | |
| 690 | kfree(tp->md5sig_info->keys6); |
| 691 | tp->md5sig_info->keys6 = NULL; |
| 692 | tp->md5sig_info->alloced6 = 0; |
| 693 | |
| 694 | if (tp->md5sig_info->entries4) { |
| 695 | for (i = 0; i < tp->md5sig_info->entries4; i++) |
David S. Miller | f8ab18d | 2007-09-28 15:18:35 -0700 | [diff] [blame] | 696 | kfree(tp->md5sig_info->keys4[i].base.key); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 697 | tp->md5sig_info->entries4 = 0; |
| 698 | tcp_free_md5sig_pool(); |
| 699 | } |
| 700 | |
| 701 | kfree(tp->md5sig_info->keys4); |
| 702 | tp->md5sig_info->keys4 = NULL; |
| 703 | tp->md5sig_info->alloced4 = 0; |
| 704 | } |
| 705 | |
| 706 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, |
| 707 | int optlen) |
| 708 | { |
| 709 | struct tcp_md5sig cmd; |
| 710 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; |
| 711 | u8 *newkey; |
| 712 | |
| 713 | if (optlen < sizeof(cmd)) |
| 714 | return -EINVAL; |
| 715 | |
| 716 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
| 717 | return -EFAULT; |
| 718 | |
| 719 | if (sin6->sin6_family != AF_INET6) |
| 720 | return -EINVAL; |
| 721 | |
| 722 | if (!cmd.tcpm_keylen) { |
| 723 | if (!tcp_sk(sk)->md5sig_info) |
| 724 | return -ENOENT; |
Brian Haley | e773e4f | 2007-08-24 23:16:08 -0700 | [diff] [blame] | 725 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 726 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
| 727 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); |
| 728 | } |
| 729 | |
| 730 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 731 | return -EINVAL; |
| 732 | |
| 733 | if (!tcp_sk(sk)->md5sig_info) { |
| 734 | struct tcp_sock *tp = tcp_sk(sk); |
| 735 | struct tcp_md5sig_info *p; |
| 736 | |
| 737 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); |
| 738 | if (!p) |
| 739 | return -ENOMEM; |
| 740 | |
| 741 | tp->md5sig_info = p; |
Eric Dumazet | a465419 | 2010-05-16 00:36:33 -0700 | [diff] [blame] | 742 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 743 | } |
| 744 | |
Arnaldo Carvalho de Melo | af879cc | 2006-11-17 12:14:37 -0200 | [diff] [blame] | 745 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 746 | if (!newkey) |
| 747 | return -ENOMEM; |
Brian Haley | e773e4f | 2007-08-24 23:16:08 -0700 | [diff] [blame] | 748 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 749 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
| 750 | newkey, cmd.tcpm_keylen); |
| 751 | } |
| 752 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); |
| 753 | } |
| 754 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 755 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
| 756 | struct in6_addr *daddr, |
| 757 | struct in6_addr *saddr, int nbytes) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 758 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 759 | struct tcp6_pseudohdr *bp; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 760 | struct scatterlist sg; |
YOSHIFUJI Hideaki | 8d26d76 | 2008-04-17 13:19:16 +0900 | [diff] [blame] | 761 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 762 | bp = &hp->md5_blk.ip6; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 763 | /* 1. TCP pseudo-header (RFC2460) */ |
| 764 | ipv6_addr_copy(&bp->saddr, saddr); |
| 765 | ipv6_addr_copy(&bp->daddr, daddr); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 766 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
Adam Langley | 00b1304 | 2008-07-31 21:36:07 -0700 | [diff] [blame] | 767 | bp->len = cpu_to_be32(nbytes); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 768 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 769 | sg_init_one(&sg, bp, sizeof(*bp)); |
| 770 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); |
| 771 | } |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 772 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 773 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
| 774 | struct in6_addr *daddr, struct in6_addr *saddr, |
| 775 | struct tcphdr *th) |
| 776 | { |
| 777 | struct tcp_md5sig_pool *hp; |
| 778 | struct hash_desc *desc; |
| 779 | |
| 780 | hp = tcp_get_md5sig_pool(); |
| 781 | if (!hp) |
| 782 | goto clear_hash_noput; |
| 783 | desc = &hp->md5_desc; |
| 784 | |
| 785 | if (crypto_hash_init(desc)) |
| 786 | goto clear_hash; |
| 787 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) |
| 788 | goto clear_hash; |
| 789 | if (tcp_md5_hash_header(hp, th)) |
| 790 | goto clear_hash; |
| 791 | if (tcp_md5_hash_key(hp, key)) |
| 792 | goto clear_hash; |
| 793 | if (crypto_hash_final(desc, md5_hash)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 794 | goto clear_hash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 795 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 796 | tcp_put_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 797 | return 0; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 798 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 799 | clear_hash: |
| 800 | tcp_put_md5sig_pool(); |
| 801 | clear_hash_noput: |
| 802 | memset(md5_hash, 0, 16); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 803 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 804 | } |
| 805 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 806 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
| 807 | struct sock *sk, struct request_sock *req, |
| 808 | struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 809 | { |
| 810 | struct in6_addr *saddr, *daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 811 | struct tcp_md5sig_pool *hp; |
| 812 | struct hash_desc *desc; |
| 813 | struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 814 | |
| 815 | if (sk) { |
| 816 | saddr = &inet6_sk(sk)->saddr; |
| 817 | daddr = &inet6_sk(sk)->daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 818 | } else if (req) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 819 | saddr = &inet6_rsk(req)->loc_addr; |
| 820 | daddr = &inet6_rsk(req)->rmt_addr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 821 | } else { |
| 822 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
| 823 | saddr = &ip6h->saddr; |
| 824 | daddr = &ip6h->daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 825 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 826 | |
| 827 | hp = tcp_get_md5sig_pool(); |
| 828 | if (!hp) |
| 829 | goto clear_hash_noput; |
| 830 | desc = &hp->md5_desc; |
| 831 | |
| 832 | if (crypto_hash_init(desc)) |
| 833 | goto clear_hash; |
| 834 | |
| 835 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) |
| 836 | goto clear_hash; |
| 837 | if (tcp_md5_hash_header(hp, th)) |
| 838 | goto clear_hash; |
| 839 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) |
| 840 | goto clear_hash; |
| 841 | if (tcp_md5_hash_key(hp, key)) |
| 842 | goto clear_hash; |
| 843 | if (crypto_hash_final(desc, md5_hash)) |
| 844 | goto clear_hash; |
| 845 | |
| 846 | tcp_put_md5sig_pool(); |
| 847 | return 0; |
| 848 | |
| 849 | clear_hash: |
| 850 | tcp_put_md5sig_pool(); |
| 851 | clear_hash_noput: |
| 852 | memset(md5_hash, 0, 16); |
| 853 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 854 | } |
| 855 | |
| 856 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) |
| 857 | { |
| 858 | __u8 *hash_location = NULL; |
| 859 | struct tcp_md5sig_key *hash_expected; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 860 | struct ipv6hdr *ip6h = ipv6_hdr(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 861 | struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 862 | int genhash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 863 | u8 newhash[16]; |
| 864 | |
| 865 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); |
YOSHIFUJI Hideaki | 7d5d552 | 2008-04-17 12:29:53 +0900 | [diff] [blame] | 866 | hash_location = tcp_parse_md5sig_option(th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 867 | |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 868 | /* We've parsed the options - do we have a hash? */ |
| 869 | if (!hash_expected && !hash_location) |
| 870 | return 0; |
| 871 | |
| 872 | if (hash_expected && !hash_location) { |
| 873 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 874 | return 1; |
| 875 | } |
| 876 | |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 877 | if (!hash_expected && hash_location) { |
| 878 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 879 | return 1; |
| 880 | } |
| 881 | |
| 882 | /* check the signature */ |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 883 | genhash = tcp_v6_md5_hash_skb(newhash, |
| 884 | hash_expected, |
| 885 | NULL, NULL, skb); |
| 886 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 887 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
| 888 | if (net_ratelimit()) { |
Joe Perches | 5856b60 | 2010-01-08 00:59:52 -0800 | [diff] [blame] | 889 | printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 890 | genhash ? "failed" : "mismatch", |
Harvey Harrison | 0c6ce78 | 2008-10-28 16:09:23 -0700 | [diff] [blame] | 891 | &ip6h->saddr, ntohs(th->source), |
| 892 | &ip6h->daddr, ntohs(th->dest)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 893 | } |
| 894 | return 1; |
| 895 | } |
| 896 | return 0; |
| 897 | } |
| 898 | #endif |
| 899 | |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 900 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | .family = AF_INET6, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 902 | .obj_size = sizeof(struct tcp6_request_sock), |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 903 | .rtx_syn_ack = tcp_v6_rtx_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 904 | .send_ack = tcp_v6_reqsk_send_ack, |
| 905 | .destructor = tcp_v6_reqsk_destructor, |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 906 | .send_reset = tcp_v6_send_reset, |
| 907 | .syn_ack_timeout = tcp_syn_ack_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | }; |
| 909 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 910 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 911 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 912 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
John Dykstra | e3afe7b | 2009-07-16 05:04:51 +0000 | [diff] [blame] | 913 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 914 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 915 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 916 | |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 917 | static void __tcp_v6_send_check(struct sk_buff *skb, |
| 918 | struct in6_addr *saddr, struct in6_addr *daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 920 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 922 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 923 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 924 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 925 | skb->csum_offset = offsetof(struct tcphdr, check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | } else { |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 927 | th->check = tcp_v6_check(skb->len, saddr, daddr, |
| 928 | csum_partial(th, th->doff << 2, |
| 929 | skb->csum)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | } |
| 931 | } |
| 932 | |
Herbert Xu | bb29624 | 2010-04-11 02:15:55 +0000 | [diff] [blame] | 933 | static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 934 | { |
| 935 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 936 | |
| 937 | __tcp_v6_send_check(skb, &np->saddr, &np->daddr); |
| 938 | } |
| 939 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 940 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
| 941 | { |
| 942 | struct ipv6hdr *ipv6h; |
| 943 | struct tcphdr *th; |
| 944 | |
| 945 | if (!pskb_may_pull(skb, sizeof(*th))) |
| 946 | return -EINVAL; |
| 947 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 948 | ipv6h = ipv6_hdr(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 949 | th = tcp_hdr(skb); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 950 | |
| 951 | th->check = 0; |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 952 | skb->ip_summed = CHECKSUM_PARTIAL; |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 953 | __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 954 | return 0; |
| 955 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | |
Herbert Xu | 3699067 | 2009-05-22 00:45:28 -0700 | [diff] [blame] | 957 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
| 958 | struct sk_buff *skb) |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 959 | { |
Herbert Xu | 36e7b1b | 2009-04-27 05:44:45 -0700 | [diff] [blame] | 960 | struct ipv6hdr *iph = skb_gro_network_header(skb); |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 961 | |
| 962 | switch (skb->ip_summed) { |
| 963 | case CHECKSUM_COMPLETE: |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 964 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 965 | skb->csum)) { |
| 966 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 967 | break; |
| 968 | } |
| 969 | |
| 970 | /* fall through */ |
| 971 | case CHECKSUM_NONE: |
| 972 | NAPI_GRO_CB(skb)->flush = 1; |
| 973 | return NULL; |
| 974 | } |
| 975 | |
| 976 | return tcp_gro_receive(head, skb); |
| 977 | } |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 978 | |
Herbert Xu | 3699067 | 2009-05-22 00:45:28 -0700 | [diff] [blame] | 979 | static int tcp6_gro_complete(struct sk_buff *skb) |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 980 | { |
| 981 | struct ipv6hdr *iph = ipv6_hdr(skb); |
| 982 | struct tcphdr *th = tcp_hdr(skb); |
| 983 | |
| 984 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), |
| 985 | &iph->saddr, &iph->daddr, 0); |
| 986 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
| 987 | |
| 988 | return tcp_gro_complete(skb); |
| 989 | } |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 990 | |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 991 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
| 992 | u32 ts, struct tcp_md5sig_key *key, int rst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 994 | struct tcphdr *th = tcp_hdr(skb), *t1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | struct sk_buff *buff; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 996 | struct flowi6 fl6; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 997 | struct net *net = dev_net(skb_dst(skb)->dev); |
Daniel Lezcano | e504799 | 2008-03-07 11:16:26 -0800 | [diff] [blame] | 998 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
YOSHIFUJI Hideaki | 9cb5734 | 2008-01-12 02:16:03 -0800 | [diff] [blame] | 999 | unsigned int tot_len = sizeof(struct tcphdr); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1000 | struct dst_entry *dst; |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1001 | __be32 *topt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | |
| 1003 | if (ts) |
YOSHIFUJI Hideaki | 4244f8a | 2006-10-10 19:40:50 -0700 | [diff] [blame] | 1004 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1005 | #ifdef CONFIG_TCP_MD5SIG |
| 1006 | if (key) |
| 1007 | tot_len += TCPOLEN_MD5SIG_ALIGNED; |
| 1008 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | |
| 1010 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
| 1011 | GFP_ATOMIC); |
| 1012 | if (buff == NULL) |
| 1013 | return; |
| 1014 | |
| 1015 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
| 1016 | |
Ilpo Järvinen | 77c676d | 2008-10-09 14:41:38 -0700 | [diff] [blame] | 1017 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
Herbert Xu | 6651ffc | 2010-04-21 00:47:15 -0700 | [diff] [blame] | 1018 | skb_reset_transport_header(buff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
| 1020 | /* Swap the send and the receive. */ |
| 1021 | memset(t1, 0, sizeof(*t1)); |
| 1022 | t1->dest = th->source; |
| 1023 | t1->source = th->dest; |
Ilpo Järvinen | 77c676d | 2008-10-09 14:41:38 -0700 | [diff] [blame] | 1024 | t1->doff = tot_len / 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | t1->seq = htonl(seq); |
| 1026 | t1->ack_seq = htonl(ack); |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 1027 | t1->ack = !rst || !th->ack; |
| 1028 | t1->rst = rst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | t1->window = htons(win); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1030 | |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 1031 | topt = (__be32 *)(t1 + 1); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1032 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | if (ts) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1034 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 1035 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); |
| 1036 | *topt++ = htonl(tcp_time_stamp); |
Ilpo Järvinen | 53b1257 | 2008-10-08 14:36:33 -0700 | [diff] [blame] | 1037 | *topt++ = htonl(ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | } |
| 1039 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1040 | #ifdef CONFIG_TCP_MD5SIG |
| 1041 | if (key) { |
| 1042 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 1043 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1044 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, |
Adam Langley | 90b7e11 | 2008-07-31 20:49:48 -0700 | [diff] [blame] | 1045 | &ipv6_hdr(skb)->saddr, |
| 1046 | &ipv6_hdr(skb)->daddr, t1); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1047 | } |
| 1048 | #endif |
| 1049 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1050 | memset(&fl6, 0, sizeof(fl6)); |
| 1051 | ipv6_addr_copy(&fl6.daddr, &ipv6_hdr(skb)->saddr); |
| 1052 | ipv6_addr_copy(&fl6.saddr, &ipv6_hdr(skb)->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | |
David S. Miller | e5700af | 2010-04-21 14:59:20 -0700 | [diff] [blame] | 1054 | buff->ip_summed = CHECKSUM_PARTIAL; |
| 1055 | buff->csum = 0; |
| 1056 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1057 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1059 | fl6.flowi6_proto = IPPROTO_TCP; |
| 1060 | fl6.flowi6_oif = inet6_iif(skb); |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 1061 | fl6.fl6_dport = t1->dest; |
| 1062 | fl6.fl6_sport = t1->source; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1063 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 1065 | /* Pass a socket to ip6_dst_lookup either it is for RST |
| 1066 | * Underlying function will use this to retrieve the network |
| 1067 | * namespace |
| 1068 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1069 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1070 | if (!IS_ERR(dst)) { |
| 1071 | skb_dst_set(buff, dst); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1072 | ip6_xmit(ctl_sk, buff, &fl6, NULL); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1073 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
| 1074 | if (rst) |
| 1075 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); |
| 1076 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | } |
| 1078 | |
| 1079 | kfree_skb(buff); |
| 1080 | } |
| 1081 | |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 1082 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
| 1083 | { |
| 1084 | struct tcphdr *th = tcp_hdr(skb); |
| 1085 | u32 seq = 0, ack_seq = 0; |
Guo-Fu Tseng | fa3e5b4 | 2008-10-09 21:11:56 -0700 | [diff] [blame] | 1086 | struct tcp_md5sig_key *key = NULL; |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 1087 | |
| 1088 | if (th->rst) |
| 1089 | return; |
| 1090 | |
| 1091 | if (!ipv6_unicast_destination(skb)) |
| 1092 | return; |
| 1093 | |
| 1094 | #ifdef CONFIG_TCP_MD5SIG |
| 1095 | if (sk) |
| 1096 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 1097 | #endif |
| 1098 | |
| 1099 | if (th->ack) |
| 1100 | seq = ntohl(th->ack_seq); |
| 1101 | else |
| 1102 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - |
| 1103 | (th->doff << 2); |
| 1104 | |
| 1105 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1); |
| 1106 | } |
| 1107 | |
| 1108 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
| 1109 | struct tcp_md5sig_key *key) |
| 1110 | { |
| 1111 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0); |
| 1112 | } |
| 1113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 1115 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1116 | struct inet_timewait_sock *tw = inet_twsk(sk); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1117 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 1119 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1120 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 1121 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1123 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | } |
| 1125 | |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 1126 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
| 1127 | struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | { |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 1129 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 1130 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | } |
| 1132 | |
| 1133 | |
| 1134 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
| 1135 | { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1136 | struct request_sock *req, **prev; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1137 | const struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | struct sock *nsk; |
| 1139 | |
| 1140 | /* Find possible connection requests. */ |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 1141 | req = inet6_csk_search_req(sk, &prev, th->source, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1142 | &ipv6_hdr(skb)->saddr, |
| 1143 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | if (req) |
| 1145 | return tcp_check_req(sk, skb, req, prev); |
| 1146 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1147 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
Pavel Emelyanov | d86e0da | 2008-01-31 05:07:21 -0800 | [diff] [blame] | 1148 | &ipv6_hdr(skb)->saddr, th->source, |
| 1149 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | |
| 1151 | if (nsk) { |
| 1152 | if (nsk->sk_state != TCP_TIME_WAIT) { |
| 1153 | bh_lock_sock(nsk); |
| 1154 | return nsk; |
| 1155 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1156 | inet_twsk_put(inet_twsk(nsk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | return NULL; |
| 1158 | } |
| 1159 | |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1160 | #ifdef CONFIG_SYN_COOKIES |
Florian Westphal | af9b473 | 2010-06-03 00:43:44 +0000 | [diff] [blame] | 1161 | if (!th->syn) |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1162 | sk = cookie_v6_check(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | #endif |
| 1164 | return sk; |
| 1165 | } |
| 1166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | /* FIXME: this is substantially similar to the ipv4 code. |
| 1168 | * Can some kind of merge be done? -- erics |
| 1169 | */ |
| 1170 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1171 | { |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1172 | struct tcp_extend_values tmp_ext; |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1173 | struct tcp_options_received tmp_opt; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1174 | u8 *hash_location; |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1175 | struct request_sock *req; |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1176 | struct inet6_request_sock *treq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | struct ipv6_pinfo *np = inet6_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | struct tcp_sock *tp = tcp_sk(sk); |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1179 | __u32 isn = TCP_SKB_CB(skb)->when; |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1180 | struct dst_entry *dst = NULL; |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1181 | #ifdef CONFIG_SYN_COOKIES |
| 1182 | int want_cookie = 0; |
| 1183 | #else |
| 1184 | #define want_cookie 0 |
| 1185 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | |
| 1187 | if (skb->protocol == htons(ETH_P_IP)) |
| 1188 | return tcp_v4_conn_request(sk, skb); |
| 1189 | |
| 1190 | if (!ipv6_unicast_destination(skb)) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1191 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1193 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | if (net_ratelimit()) |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1195 | syn_flood_warning(skb); |
| 1196 | #ifdef CONFIG_SYN_COOKIES |
| 1197 | if (sysctl_tcp_syncookies) |
| 1198 | want_cookie = 1; |
| 1199 | else |
| 1200 | #endif |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1201 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | } |
| 1203 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1204 | 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] | 1205 | goto drop; |
| 1206 | |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1207 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | if (req == NULL) |
| 1209 | goto drop; |
| 1210 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1211 | #ifdef CONFIG_TCP_MD5SIG |
| 1212 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; |
| 1213 | #endif |
| 1214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | tcp_clear_options(&tmp_opt); |
| 1216 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| 1217 | tmp_opt.user_mss = tp->rx_opt.user_mss; |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1218 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1220 | if (tmp_opt.cookie_plus > 0 && |
| 1221 | tmp_opt.saw_tstamp && |
| 1222 | !tp->rx_opt.cookie_out_never && |
| 1223 | (sysctl_tcp_cookie_size > 0 || |
| 1224 | (tp->cookie_values != NULL && |
| 1225 | tp->cookie_values->cookie_desired > 0))) { |
| 1226 | u8 *c; |
| 1227 | u32 *d; |
| 1228 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; |
| 1229 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; |
| 1230 | |
| 1231 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) |
| 1232 | goto drop_and_free; |
| 1233 | |
| 1234 | /* Secret recipe starts with IP addresses */ |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 1235 | d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1236 | *mess++ ^= *d++; |
| 1237 | *mess++ ^= *d++; |
| 1238 | *mess++ ^= *d++; |
| 1239 | *mess++ ^= *d++; |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 1240 | d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1241 | *mess++ ^= *d++; |
| 1242 | *mess++ ^= *d++; |
| 1243 | *mess++ ^= *d++; |
| 1244 | *mess++ ^= *d++; |
| 1245 | |
| 1246 | /* plus variable length Initiator Cookie */ |
| 1247 | c = (u8 *)mess; |
| 1248 | while (l-- > 0) |
| 1249 | *c++ ^= *hash_location++; |
| 1250 | |
| 1251 | #ifdef CONFIG_SYN_COOKIES |
| 1252 | want_cookie = 0; /* not our kind of cookie */ |
| 1253 | #endif |
| 1254 | tmp_ext.cookie_out_never = 0; /* false */ |
| 1255 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; |
| 1256 | } else if (!tp->rx_opt.cookie_in_always) { |
| 1257 | /* redundant indications, but ensure initialization. */ |
| 1258 | tmp_ext.cookie_out_never = 1; /* true */ |
| 1259 | tmp_ext.cookie_plus = 0; |
| 1260 | } else { |
| 1261 | goto drop_and_free; |
| 1262 | } |
| 1263 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | |
Florian Westphal | 4dfc281 | 2008-04-10 03:12:40 -0700 | [diff] [blame] | 1265 | if (want_cookie && !tmp_opt.saw_tstamp) |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1266 | tcp_clear_options(&tmp_opt); |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1267 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
| 1269 | tcp_openreq_init(req, &tmp_opt, skb); |
| 1270 | |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1271 | treq = inet6_rsk(req); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1272 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
| 1273 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); |
Florian Westphal | 172d69e | 2010-06-21 11:48:45 +0000 | [diff] [blame] | 1274 | if (!want_cookie || tmp_opt.tstamp_ok) |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1275 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | |
Florian Westphal | 2bbdf38 | 2010-06-13 11:29:39 +0000 | [diff] [blame] | 1277 | if (!isn) { |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1278 | struct inet_peer *peer = NULL; |
| 1279 | |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1280 | if (ipv6_opt_accepted(sk, skb) || |
| 1281 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
| 1282 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { |
| 1283 | atomic_inc(&skb->users); |
| 1284 | treq->pktopts = skb; |
| 1285 | } |
| 1286 | treq->iif = sk->sk_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1288 | /* So that link locals have meaning */ |
| 1289 | if (!sk->sk_bound_dev_if && |
| 1290 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
| 1291 | treq->iif = inet6_iif(skb); |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1292 | |
| 1293 | if (want_cookie) { |
Florian Westphal | 2bbdf38 | 2010-06-13 11:29:39 +0000 | [diff] [blame] | 1294 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
| 1295 | req->cookie_ts = tmp_opt.tstamp_ok; |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1296 | goto have_isn; |
Florian Westphal | 2bbdf38 | 2010-06-13 11:29:39 +0000 | [diff] [blame] | 1297 | } |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1298 | |
| 1299 | /* VJ's idea. We save last timestamp seen |
| 1300 | * from the destination in peer table, when entering |
| 1301 | * state TIME-WAIT, and check against it before |
| 1302 | * accepting new connection request. |
| 1303 | * |
| 1304 | * If "isn" is not zero, this request hit alive |
| 1305 | * timewait bucket, so that all the necessary checks |
| 1306 | * are made in the function processing timewait state. |
| 1307 | */ |
| 1308 | if (tmp_opt.saw_tstamp && |
| 1309 | tcp_death_row.sysctl_tw_recycle && |
| 1310 | (dst = inet6_csk_route_req(sk, req)) != NULL && |
| 1311 | (peer = rt6_get_peer((struct rt6_info *)dst)) != NULL && |
David S. Miller | 7a71ed8 | 2011-02-09 14:30:26 -0800 | [diff] [blame] | 1312 | ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6, |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1313 | &treq->rmt_addr)) { |
| 1314 | inet_peer_refcheck(peer); |
| 1315 | if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL && |
| 1316 | (s32)(peer->tcp_ts - req->ts_recent) > |
| 1317 | TCP_PAWS_WINDOW) { |
| 1318 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
| 1319 | goto drop_and_release; |
| 1320 | } |
| 1321 | } |
| 1322 | /* Kill the following clause, if you dislike this way. */ |
| 1323 | else if (!sysctl_tcp_syncookies && |
| 1324 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
| 1325 | (sysctl_max_syn_backlog >> 2)) && |
| 1326 | (!peer || !peer->tcp_ts_stamp) && |
| 1327 | (!dst || !dst_metric(dst, RTAX_RTT))) { |
| 1328 | /* Without syncookies last quarter of |
| 1329 | * backlog is filled with destinations, |
| 1330 | * proven to be alive. |
| 1331 | * It means that we continue to communicate |
| 1332 | * to destinations, already remembered |
| 1333 | * to the moment of synflood. |
| 1334 | */ |
| 1335 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", |
| 1336 | &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); |
| 1337 | goto drop_and_release; |
| 1338 | } |
| 1339 | |
| 1340 | isn = tcp_v6_init_sequence(skb); |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1341 | } |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1342 | have_isn: |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1343 | tcp_rsk(req)->snt_isn = isn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 1345 | security_inet_conn_request(sk, skb, req); |
| 1346 | |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1347 | if (tcp_v6_send_synack(sk, req, |
| 1348 | (struct request_values *)&tmp_ext) || |
| 1349 | want_cookie) |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1350 | goto drop_and_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1352 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
| 1353 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1355 | drop_and_release: |
| 1356 | dst_release(dst); |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1357 | drop_and_free: |
| 1358 | reqsk_free(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | drop: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | return 0; /* don't send reset */ |
| 1361 | } |
| 1362 | |
| 1363 | 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] | 1364 | struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | struct dst_entry *dst) |
| 1366 | { |
Vegard Nossum | 78d15e8 | 2008-09-12 16:17:43 -0700 | [diff] [blame] | 1367 | struct inet6_request_sock *treq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
| 1369 | struct tcp6_sock *newtcp6sk; |
| 1370 | struct inet_sock *newinet; |
| 1371 | struct tcp_sock *newtp; |
| 1372 | struct sock *newsk; |
| 1373 | struct ipv6_txoptions *opt; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1374 | #ifdef CONFIG_TCP_MD5SIG |
| 1375 | struct tcp_md5sig_key *key; |
| 1376 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
| 1378 | if (skb->protocol == htons(ETH_P_IP)) { |
| 1379 | /* |
| 1380 | * v6 mapped |
| 1381 | */ |
| 1382 | |
| 1383 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); |
| 1384 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1385 | if (newsk == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | return NULL; |
| 1387 | |
| 1388 | newtcp6sk = (struct tcp6_sock *)newsk; |
| 1389 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| 1390 | |
| 1391 | newinet = inet_sk(newsk); |
| 1392 | newnp = inet6_sk(newsk); |
| 1393 | newtp = tcp_sk(newsk); |
| 1394 | |
| 1395 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 1396 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1397 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1399 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | |
| 1401 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); |
| 1402 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1403 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1405 | #ifdef CONFIG_TCP_MD5SIG |
| 1406 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; |
| 1407 | #endif |
| 1408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | newnp->pktoptions = NULL; |
| 1410 | newnp->opt = NULL; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1411 | newnp->mcast_oif = inet6_iif(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1412 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1414 | /* |
| 1415 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count |
| 1416 | * here, tcp_create_openreq_child now does this for us, see the comment in |
| 1417 | * that function for the gory details. -acme |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | |
| 1420 | /* It is tricky place. Until this moment IPv4 tcp |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1421 | worked with IPv6 icsk.icsk_af_ops. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | Sync it now. |
| 1423 | */ |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1424 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | |
| 1426 | return newsk; |
| 1427 | } |
| 1428 | |
Vegard Nossum | 78d15e8 | 2008-09-12 16:17:43 -0700 | [diff] [blame] | 1429 | treq = inet6_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | opt = np->opt; |
| 1431 | |
| 1432 | if (sk_acceptq_is_full(sk)) |
| 1433 | goto out_overflow; |
| 1434 | |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1435 | if (!dst) { |
| 1436 | dst = inet6_csk_route_req(sk, req); |
| 1437 | if (!dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | goto out; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1439 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | |
| 1441 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1442 | if (newsk == NULL) |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1443 | goto out_nonewsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1445 | /* |
| 1446 | * No need to charge this sock to the relevant IPv6 refcnt debug socks |
| 1447 | * count here, tcp_create_openreq_child now does this for us, see the |
| 1448 | * comment in that function for the gory details. -acme |
| 1449 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | |
Stephen Hemminger | 59eed27 | 2006-08-25 15:55:43 -0700 | [diff] [blame] | 1451 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 1452 | __ip6_dst_store(newsk, dst, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | |
| 1454 | newtcp6sk = (struct tcp6_sock *)newsk; |
| 1455 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| 1456 | |
| 1457 | newtp = tcp_sk(newsk); |
| 1458 | newinet = inet_sk(newsk); |
| 1459 | newnp = inet6_sk(newsk); |
| 1460 | |
| 1461 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 1462 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1463 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
| 1464 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); |
| 1465 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); |
| 1466 | newsk->sk_bound_dev_if = treq->iif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1468 | /* Now IPv6 options... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | |
| 1470 | First: no IPv4 options. |
| 1471 | */ |
| 1472 | newinet->opt = NULL; |
Masayuki Nakagawa | d35690b | 2007-03-16 16:14:03 -0700 | [diff] [blame] | 1473 | newnp->ipv6_fl_list = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | |
| 1475 | /* Clone RX bits */ |
| 1476 | newnp->rxopt.all = np->rxopt.all; |
| 1477 | |
| 1478 | /* Clone pktoptions received with SYN */ |
| 1479 | newnp->pktoptions = NULL; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1480 | if (treq->pktopts != NULL) { |
| 1481 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); |
| 1482 | kfree_skb(treq->pktopts); |
| 1483 | treq->pktopts = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | if (newnp->pktoptions) |
| 1485 | skb_set_owner_r(newnp->pktoptions, newsk); |
| 1486 | } |
| 1487 | newnp->opt = NULL; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1488 | newnp->mcast_oif = inet6_iif(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1489 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | |
| 1491 | /* Clone native IPv6 options from listening socket (if any) |
| 1492 | |
| 1493 | Yes, keeping reference count would be much more clever, |
| 1494 | but we make one more one thing there: reattach optmem |
| 1495 | to newsk. |
| 1496 | */ |
| 1497 | if (opt) { |
| 1498 | newnp->opt = ipv6_dup_options(newsk, opt); |
| 1499 | if (opt != np->opt) |
| 1500 | sock_kfree_s(sk, opt, opt->tot_len); |
| 1501 | } |
| 1502 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1503 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | if (newnp->opt) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1505 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
| 1506 | newnp->opt->opt_flen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | |
John Heffner | 5d424d5 | 2006-03-20 17:53:41 -0800 | [diff] [blame] | 1508 | tcp_mtup_init(newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | tcp_sync_mss(newsk, dst_mtu(dst)); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1510 | newtp->advmss = dst_metric_advmss(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | tcp_initialize_rcv_mss(newsk); |
| 1512 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1513 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
| 1514 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1516 | #ifdef CONFIG_TCP_MD5SIG |
| 1517 | /* Copy over the MD5 key from the original socket */ |
| 1518 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { |
| 1519 | /* We're using one, so create a matching key |
| 1520 | * on the newsk structure. If we fail to get |
| 1521 | * memory, then we end up not copying the key |
| 1522 | * across. Shucks. |
| 1523 | */ |
Arnaldo Carvalho de Melo | af879cc | 2006-11-17 12:14:37 -0200 | [diff] [blame] | 1524 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
| 1525 | if (newkey != NULL) |
John Dykstra | e547bc1 | 2009-07-17 09:23:22 +0000 | [diff] [blame] | 1526 | tcp_v6_md5_do_add(newsk, &newnp->daddr, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1527 | newkey, key->keylen); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1528 | } |
| 1529 | #endif |
| 1530 | |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1531 | if (__inet_inherit_port(sk, newsk) < 0) { |
| 1532 | sock_put(newsk); |
| 1533 | goto out; |
| 1534 | } |
Eric Dumazet | 9327f70 | 2009-12-04 03:46:54 +0000 | [diff] [blame] | 1535 | __inet6_hash(newsk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | |
| 1537 | return newsk; |
| 1538 | |
| 1539 | out_overflow: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1540 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1541 | out_nonewsk: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | if (opt && opt != np->opt) |
| 1543 | sock_kfree_s(sk, opt, opt->tot_len); |
| 1544 | dst_release(dst); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1545 | out: |
| 1546 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | return NULL; |
| 1548 | } |
| 1549 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 1550 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1552 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 1553 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1554 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1555 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | return 0; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1557 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1558 | } |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1559 | |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 1560 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1561 | &ipv6_hdr(skb)->saddr, |
| 1562 | &ipv6_hdr(skb)->daddr, 0)); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | if (skb->len <= 76) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1565 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | } |
| 1567 | return 0; |
| 1568 | } |
| 1569 | |
| 1570 | /* The socket must have it's spinlock held when we get |
| 1571 | * here. |
| 1572 | * |
| 1573 | * We have a potential double-lock case here, so even when |
| 1574 | * doing backlog processing we use the BH locking scheme. |
| 1575 | * This is because we cannot sleep with the original spinlock |
| 1576 | * held. |
| 1577 | */ |
| 1578 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1579 | { |
| 1580 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1581 | struct tcp_sock *tp; |
| 1582 | struct sk_buff *opt_skb = NULL; |
| 1583 | |
| 1584 | /* Imagine: socket is IPv6. IPv4 packet arrives, |
| 1585 | goes to IPv4 receive handler and backlogged. |
| 1586 | From backlog it always goes here. Kerboom... |
| 1587 | Fortunately, tcp_rcv_established and rcv_established |
| 1588 | handle them correctly, but it is not case with |
| 1589 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK |
| 1590 | */ |
| 1591 | |
| 1592 | if (skb->protocol == htons(ETH_P_IP)) |
| 1593 | return tcp_v4_do_rcv(sk, skb); |
| 1594 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1595 | #ifdef CONFIG_TCP_MD5SIG |
| 1596 | if (tcp_v6_inbound_md5_hash (sk, skb)) |
| 1597 | goto discard; |
| 1598 | #endif |
| 1599 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1600 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | goto discard; |
| 1602 | |
| 1603 | /* |
| 1604 | * socket locking is here for SMP purposes as backlog rcv |
| 1605 | * is currently called with bh processing disabled. |
| 1606 | */ |
| 1607 | |
| 1608 | /* Do Stevens' IPV6_PKTOPTIONS. |
| 1609 | |
| 1610 | Yes, guys, it is the only place in our code, where we |
| 1611 | may make it not affecting IPv4. |
| 1612 | The rest of code is protocol independent, |
| 1613 | and I do not like idea to uglify IPv4. |
| 1614 | |
| 1615 | Actually, all the idea behind IPV6_PKTOPTIONS |
| 1616 | looks not very well thought. For now we latch |
| 1617 | options, received in the last packet, enqueued |
| 1618 | by tcp. Feel free to propose better solution. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1619 | --ANK (980728) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | */ |
| 1621 | if (np->rxopt.all) |
| 1622 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
| 1623 | |
| 1624 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1625 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | goto reset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | if (opt_skb) |
| 1628 | goto ipv6_pktoptions; |
| 1629 | return 0; |
| 1630 | } |
| 1631 | |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 1632 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | goto csum_err; |
| 1634 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1635 | if (sk->sk_state == TCP_LISTEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
| 1637 | if (!nsk) |
| 1638 | goto discard; |
| 1639 | |
| 1640 | /* |
| 1641 | * Queue it on the new socket if the new socket is active, |
| 1642 | * otherwise we just shortcircuit this and continue with |
| 1643 | * the new socket.. |
| 1644 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1645 | if(nsk != sk) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | if (tcp_child_process(sk, nsk, skb)) |
| 1647 | goto reset; |
| 1648 | if (opt_skb) |
| 1649 | __kfree_skb(opt_skb); |
| 1650 | return 0; |
| 1651 | } |
| 1652 | } |
| 1653 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1654 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | goto reset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | if (opt_skb) |
| 1657 | goto ipv6_pktoptions; |
| 1658 | return 0; |
| 1659 | |
| 1660 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1661 | tcp_v6_send_reset(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | discard: |
| 1663 | if (opt_skb) |
| 1664 | __kfree_skb(opt_skb); |
| 1665 | kfree_skb(skb); |
| 1666 | return 0; |
| 1667 | csum_err: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1668 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | goto discard; |
| 1670 | |
| 1671 | |
| 1672 | ipv6_pktoptions: |
| 1673 | /* Do you ask, what is it? |
| 1674 | |
| 1675 | 1. skb was enqueued by tcp. |
| 1676 | 2. skb is added to tail of read queue, rather than out of order. |
| 1677 | 3. socket is not in passive state. |
| 1678 | 4. Finally, it really contains options, which user wants to receive. |
| 1679 | */ |
| 1680 | tp = tcp_sk(sk); |
| 1681 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && |
| 1682 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1683 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1684 | np->mcast_oif = inet6_iif(opt_skb); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1685 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1686 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | if (ipv6_opt_accepted(sk, opt_skb)) { |
| 1688 | skb_set_owner_r(opt_skb, sk); |
| 1689 | opt_skb = xchg(&np->pktoptions, opt_skb); |
| 1690 | } else { |
| 1691 | __kfree_skb(opt_skb); |
| 1692 | opt_skb = xchg(&np->pktoptions, NULL); |
| 1693 | } |
| 1694 | } |
| 1695 | |
Wei Yongjun | 800d55f | 2009-02-23 21:45:33 +0000 | [diff] [blame] | 1696 | kfree_skb(opt_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | return 0; |
| 1698 | } |
| 1699 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 1700 | static int tcp_v6_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1702 | struct tcphdr *th; |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 1703 | struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | struct sock *sk; |
| 1705 | int ret; |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 1706 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | |
| 1708 | if (skb->pkt_type != PACKET_HOST) |
| 1709 | goto discard_it; |
| 1710 | |
| 1711 | /* |
| 1712 | * Count it even if it's bad. |
| 1713 | */ |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1714 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | |
| 1716 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1717 | goto discard_it; |
| 1718 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1719 | th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | |
| 1721 | if (th->doff < sizeof(struct tcphdr)/4) |
| 1722 | goto bad_packet; |
| 1723 | if (!pskb_may_pull(skb, th->doff*4)) |
| 1724 | goto discard_it; |
| 1725 | |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 1726 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | goto bad_packet; |
| 1728 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1729 | th = tcp_hdr(skb); |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 1730 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1732 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1733 | skb->len - th->doff*4); |
| 1734 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
| 1735 | TCP_SKB_CB(skb)->when = 0; |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 1736 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | TCP_SKB_CB(skb)->sacked = 0; |
| 1738 | |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 1739 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | if (!sk) |
| 1741 | goto no_tcp_socket; |
| 1742 | |
| 1743 | process: |
| 1744 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1745 | goto do_time_wait; |
| 1746 | |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 1747 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
| 1748 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
| 1749 | goto discard_and_relse; |
| 1750 | } |
| 1751 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1753 | goto discard_and_relse; |
| 1754 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1755 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | goto discard_and_relse; |
| 1757 | |
| 1758 | skb->dev = NULL; |
| 1759 | |
Fabio Olive Leite | 293b9c4 | 2006-09-25 22:28:47 -0700 | [diff] [blame] | 1760 | bh_lock_sock_nested(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | ret = 0; |
| 1762 | if (!sock_owned_by_user(sk)) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1763 | #ifdef CONFIG_NET_DMA |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1764 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | b4caea8 | 2007-10-26 04:20:13 -0700 | [diff] [blame] | 1765 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
Dan Williams | f67b459 | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 1766 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1767 | if (tp->ucopy.dma_chan) |
| 1768 | ret = tcp_v6_do_rcv(sk, skb); |
| 1769 | else |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1770 | #endif |
| 1771 | { |
| 1772 | if (!tcp_prequeue(sk, skb)) |
| 1773 | ret = tcp_v6_do_rcv(sk, skb); |
| 1774 | } |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1775 | } else if (unlikely(sk_add_backlog(sk, skb))) { |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1776 | bh_unlock_sock(sk); |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1777 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1778 | goto discard_and_relse; |
| 1779 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | bh_unlock_sock(sk); |
| 1781 | |
| 1782 | sock_put(sk); |
| 1783 | return ret ? -1 : 0; |
| 1784 | |
| 1785 | no_tcp_socket: |
| 1786 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1787 | goto discard_it; |
| 1788 | |
| 1789 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
| 1790 | bad_packet: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1791 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1793 | tcp_v6_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | } |
| 1795 | |
| 1796 | discard_it: |
| 1797 | |
| 1798 | /* |
| 1799 | * Discard frame |
| 1800 | */ |
| 1801 | |
| 1802 | kfree_skb(skb); |
| 1803 | return 0; |
| 1804 | |
| 1805 | discard_and_relse: |
| 1806 | sock_put(sk); |
| 1807 | goto discard_it; |
| 1808 | |
| 1809 | do_time_wait: |
| 1810 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1811 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | goto discard_it; |
| 1813 | } |
| 1814 | |
| 1815 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1816 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1817 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | goto discard_it; |
| 1819 | } |
| 1820 | |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1821 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | case TCP_TW_SYN: |
| 1823 | { |
| 1824 | struct sock *sk2; |
| 1825 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1826 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1827 | &ipv6_hdr(skb)->daddr, |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1828 | ntohs(th->dest), inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | if (sk2 != NULL) { |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 1830 | struct inet_timewait_sock *tw = inet_twsk(sk); |
| 1831 | inet_twsk_deschedule(tw, &tcp_death_row); |
| 1832 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | sk = sk2; |
| 1834 | goto process; |
| 1835 | } |
| 1836 | /* Fall through to ACK */ |
| 1837 | } |
| 1838 | case TCP_TW_ACK: |
| 1839 | tcp_v6_timewait_ack(sk, skb); |
| 1840 | break; |
| 1841 | case TCP_TW_RST: |
| 1842 | goto no_tcp_socket; |
| 1843 | case TCP_TW_SUCCESS:; |
| 1844 | } |
| 1845 | goto discard_it; |
| 1846 | } |
| 1847 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1848 | static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | { |
David S. Miller | db3949c | 2010-12-02 11:52:07 -0800 | [diff] [blame] | 1850 | struct rt6_info *rt = (struct rt6_info *) __sk_dst_get(sk); |
| 1851 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1852 | struct inet_peer *peer; |
| 1853 | |
| 1854 | if (!rt || |
| 1855 | !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr)) { |
| 1856 | peer = inet_getpeer_v6(&np->daddr, 1); |
| 1857 | *release_it = true; |
| 1858 | } else { |
| 1859 | if (!rt->rt6i_peer) |
| 1860 | rt6_bind_peer(rt, 1); |
| 1861 | peer = rt->rt6i_peer; |
David S. Miller | 457de43 | 2010-12-10 13:16:09 -0800 | [diff] [blame] | 1862 | *release_it = false; |
David S. Miller | db3949c | 2010-12-02 11:52:07 -0800 | [diff] [blame] | 1863 | } |
| 1864 | |
| 1865 | return peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | } |
| 1867 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1868 | static void *tcp_v6_tw_get_peer(struct sock *sk) |
| 1869 | { |
David S. Miller | db3949c | 2010-12-02 11:52:07 -0800 | [diff] [blame] | 1870 | struct inet6_timewait_sock *tw6 = inet6_twsk(sk); |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1871 | struct inet_timewait_sock *tw = inet_twsk(sk); |
| 1872 | |
| 1873 | if (tw->tw_family == AF_INET) |
| 1874 | return tcp_v4_tw_get_peer(sk); |
| 1875 | |
David S. Miller | db3949c | 2010-12-02 11:52:07 -0800 | [diff] [blame] | 1876 | return inet_getpeer_v6(&tw6->tw_v6_daddr, 1); |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1877 | } |
| 1878 | |
| 1879 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
| 1880 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
| 1881 | .twsk_unique = tcp_twsk_unique, |
| 1882 | .twsk_destructor= tcp_twsk_destructor, |
| 1883 | .twsk_getpeer = tcp_v6_tw_get_peer, |
| 1884 | }; |
| 1885 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 1886 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1887 | .queue_xmit = inet6_csk_xmit, |
| 1888 | .send_check = tcp_v6_send_check, |
| 1889 | .rebuild_header = inet6_sk_rebuild_header, |
| 1890 | .conn_request = tcp_v6_conn_request, |
| 1891 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1892 | .get_peer = tcp_v6_get_peer, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1893 | .net_header_len = sizeof(struct ipv6hdr), |
| 1894 | .setsockopt = ipv6_setsockopt, |
| 1895 | .getsockopt = ipv6_getsockopt, |
| 1896 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
| 1897 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1898 | .bind_conflict = inet6_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1899 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1900 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 1901 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1902 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | }; |
| 1904 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1905 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1906 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1907 | .md5_lookup = tcp_v6_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1908 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1909 | .md5_add = tcp_v6_md5_add_func, |
| 1910 | .md5_parse = tcp_v6_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1911 | }; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 1912 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1913 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | /* |
| 1915 | * TCP over IPv4 via INET6 API |
| 1916 | */ |
| 1917 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 1918 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1919 | .queue_xmit = ip_queue_xmit, |
| 1920 | .send_check = tcp_v4_send_check, |
| 1921 | .rebuild_header = inet_sk_rebuild_header, |
| 1922 | .conn_request = tcp_v6_conn_request, |
| 1923 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1924 | .get_peer = tcp_v4_get_peer, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1925 | .net_header_len = sizeof(struct iphdr), |
| 1926 | .setsockopt = ipv6_setsockopt, |
| 1927 | .getsockopt = ipv6_getsockopt, |
| 1928 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
| 1929 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1930 | .bind_conflict = inet6_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1931 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1932 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 1933 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1934 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | }; |
| 1936 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1937 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1938 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1939 | .md5_lookup = tcp_v4_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1940 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1941 | .md5_add = tcp_v6_md5_add_func, |
| 1942 | .md5_parse = tcp_v6_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1943 | }; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 1944 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1945 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | /* NOTE: A lot of things set to zero explicitly by call to |
| 1947 | * sk_alloc() so need not be done here. |
| 1948 | */ |
| 1949 | static int tcp_v6_init_sock(struct sock *sk) |
| 1950 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1951 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | struct tcp_sock *tp = tcp_sk(sk); |
| 1953 | |
| 1954 | skb_queue_head_init(&tp->out_of_order_queue); |
| 1955 | tcp_init_xmit_timers(sk); |
| 1956 | tcp_prequeue_init(tp); |
| 1957 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1958 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | tp->mdev = TCP_TIMEOUT_INIT; |
| 1960 | |
| 1961 | /* So many TCP implementations out there (incorrectly) count the |
| 1962 | * initial SYN frame in their delayed-ACK and congestion control |
| 1963 | * algorithms that we must have the following bandaid to talk |
| 1964 | * efficiently to them. -DaveM |
| 1965 | */ |
| 1966 | tp->snd_cwnd = 2; |
| 1967 | |
| 1968 | /* See draft-stevens-tcpca-spec-01 for discussion of the |
| 1969 | * initialization of these values. |
| 1970 | */ |
Ilpo Järvinen | 0b6a05c | 2009-09-15 01:30:10 -0700 | [diff] [blame] | 1971 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | tp->snd_cwnd_clamp = ~0; |
William Allen Simpson | bee7ca9 | 2009-11-10 09:51:18 +0000 | [diff] [blame] | 1973 | tp->mss_cache = TCP_MSS_DEFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | |
| 1975 | tp->reordering = sysctl_tcp_reordering; |
| 1976 | |
| 1977 | sk->sk_state = TCP_CLOSE; |
| 1978 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1979 | icsk->icsk_af_ops = &ipv6_specific; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1980 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1981 | icsk->icsk_sync_mss = tcp_sync_mss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | sk->sk_write_space = sk_stream_write_space; |
| 1983 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); |
| 1984 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1985 | #ifdef CONFIG_TCP_MD5SIG |
| 1986 | tp->af_specific = &tcp_sock_ipv6_specific; |
| 1987 | #endif |
| 1988 | |
William Allen Simpson | 435cf55 | 2009-12-02 18:17:05 +0000 | [diff] [blame] | 1989 | /* TCP Cookie Transactions */ |
| 1990 | if (sysctl_tcp_cookie_size > 0) { |
| 1991 | /* Default, cookies without s_data_payload. */ |
| 1992 | tp->cookie_values = |
| 1993 | kzalloc(sizeof(*tp->cookie_values), |
| 1994 | sk->sk_allocation); |
| 1995 | if (tp->cookie_values != NULL) |
| 1996 | kref_init(&tp->cookie_values->kref); |
| 1997 | } |
| 1998 | /* Presumed zeroed, in order of appearance: |
| 1999 | * cookie_in_always, cookie_out_never, |
| 2000 | * s_data_constant, s_data_in, s_data_out |
| 2001 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
| 2003 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; |
| 2004 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 2005 | local_bh_disable(); |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 2006 | percpu_counter_inc(&tcp_sockets_allocated); |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 2007 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | |
| 2009 | return 0; |
| 2010 | } |
| 2011 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 2012 | static void tcp_v6_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2014 | #ifdef CONFIG_TCP_MD5SIG |
| 2015 | /* Clean up the MD5 key list */ |
| 2016 | if (tcp_sk(sk)->md5sig_info) |
| 2017 | tcp_v6_clear_md5_list(sk); |
| 2018 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | tcp_v4_destroy_sock(sk); |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 2020 | inet6_destroy_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | } |
| 2022 | |
YOSHIFUJI Hideaki | 952a10b | 2007-04-21 20:13:44 +0900 | [diff] [blame] | 2023 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | /* Proc filesystem TCPv6 sock list dumping. */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2025 | static void get_openreq6(struct seq_file *seq, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2026 | struct sock *sk, struct request_sock *req, int i, int uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | int ttd = req->expires - jiffies; |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 2029 | struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
| 2030 | struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | |
| 2032 | if (ttd < 0) |
| 2033 | ttd = 0; |
| 2034 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | seq_printf(seq, |
| 2036 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| 2037 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", |
| 2038 | i, |
| 2039 | src->s6_addr32[0], src->s6_addr32[1], |
| 2040 | src->s6_addr32[2], src->s6_addr32[3], |
KOVACS Krisztian | fd50703 | 2008-10-19 23:35:58 -0700 | [diff] [blame] | 2041 | ntohs(inet_rsk(req)->loc_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2042 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 2043 | dest->s6_addr32[2], dest->s6_addr32[3], |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 2044 | ntohs(inet_rsk(req)->rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | TCP_SYN_RECV, |
| 2046 | 0,0, /* could print option size, but that is af dependent. */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2047 | 1, /* timers active (only the expire timer) */ |
| 2048 | jiffies_to_clock_t(ttd), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | req->retrans, |
| 2050 | uid, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2051 | 0, /* non standard timer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | 0, /* open_requests have no inode */ |
| 2053 | 0, req); |
| 2054 | } |
| 2055 | |
| 2056 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) |
| 2057 | { |
| 2058 | struct in6_addr *dest, *src; |
| 2059 | __u16 destp, srcp; |
| 2060 | int timer_active; |
| 2061 | unsigned long timer_expires; |
| 2062 | struct inet_sock *inet = inet_sk(sp); |
| 2063 | struct tcp_sock *tp = tcp_sk(sp); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2064 | const struct inet_connection_sock *icsk = inet_csk(sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | struct ipv6_pinfo *np = inet6_sk(sp); |
| 2066 | |
| 2067 | dest = &np->daddr; |
| 2068 | src = &np->rcv_saddr; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2069 | destp = ntohs(inet->inet_dport); |
| 2070 | srcp = ntohs(inet->inet_sport); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2071 | |
| 2072 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2074 | timer_expires = icsk->icsk_timeout; |
| 2075 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2077 | timer_expires = icsk->icsk_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | } else if (timer_pending(&sp->sk_timer)) { |
| 2079 | timer_active = 2; |
| 2080 | timer_expires = sp->sk_timer.expires; |
| 2081 | } else { |
| 2082 | timer_active = 0; |
| 2083 | timer_expires = jiffies; |
| 2084 | } |
| 2085 | |
| 2086 | seq_printf(seq, |
| 2087 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
Stephen Hemminger | 7be8735 | 2008-06-27 20:00:19 -0700 | [diff] [blame] | 2088 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | i, |
| 2090 | src->s6_addr32[0], src->s6_addr32[1], |
| 2091 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 2092 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 2093 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2094 | sp->sk_state, |
Sridhar Samudrala | 47da8ee | 2006-06-27 13:29:00 -0700 | [diff] [blame] | 2095 | tp->write_seq-tp->snd_una, |
| 2096 | (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] | 2097 | timer_active, |
| 2098 | jiffies_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2099 | icsk->icsk_retransmits, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | sock_i_uid(sp), |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2101 | icsk->icsk_probes_out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | sock_i_ino(sp), |
| 2103 | atomic_read(&sp->sk_refcnt), sp, |
Stephen Hemminger | 7be8735 | 2008-06-27 20:00:19 -0700 | [diff] [blame] | 2104 | jiffies_to_clock_t(icsk->icsk_rto), |
| 2105 | jiffies_to_clock_t(icsk->icsk_ack.ato), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2106 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
Ilpo Järvinen | 0b6a05c | 2009-09-15 01:30:10 -0700 | [diff] [blame] | 2107 | tp->snd_cwnd, |
| 2108 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | ); |
| 2110 | } |
| 2111 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2112 | static void get_timewait6_sock(struct seq_file *seq, |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 2113 | struct inet_timewait_sock *tw, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | { |
| 2115 | struct in6_addr *dest, *src; |
| 2116 | __u16 destp, srcp; |
Arnaldo Carvalho de Melo | 0fa1a53 | 2005-12-13 23:23:09 -0800 | [diff] [blame] | 2117 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | int ttd = tw->tw_ttd - jiffies; |
| 2119 | |
| 2120 | if (ttd < 0) |
| 2121 | ttd = 0; |
| 2122 | |
Arnaldo Carvalho de Melo | 0fa1a53 | 2005-12-13 23:23:09 -0800 | [diff] [blame] | 2123 | dest = &tw6->tw_v6_daddr; |
| 2124 | src = &tw6->tw_v6_rcv_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | destp = ntohs(tw->tw_dport); |
| 2126 | srcp = ntohs(tw->tw_sport); |
| 2127 | |
| 2128 | seq_printf(seq, |
| 2129 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| 2130 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", |
| 2131 | i, |
| 2132 | src->s6_addr32[0], src->s6_addr32[1], |
| 2133 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 2134 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 2135 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
| 2136 | tw->tw_substate, 0, 0, |
| 2137 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, |
| 2138 | atomic_read(&tw->tw_refcnt), tw); |
| 2139 | } |
| 2140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
| 2142 | { |
| 2143 | struct tcp_iter_state *st; |
| 2144 | |
| 2145 | if (v == SEQ_START_TOKEN) { |
| 2146 | seq_puts(seq, |
| 2147 | " sl " |
| 2148 | "local_address " |
| 2149 | "remote_address " |
| 2150 | "st tx_queue rx_queue tr tm->when retrnsmt" |
| 2151 | " uid timeout inode\n"); |
| 2152 | goto out; |
| 2153 | } |
| 2154 | st = seq->private; |
| 2155 | |
| 2156 | switch (st->state) { |
| 2157 | case TCP_SEQ_STATE_LISTENING: |
| 2158 | case TCP_SEQ_STATE_ESTABLISHED: |
| 2159 | get_tcp6_sock(seq, v, st->num); |
| 2160 | break; |
| 2161 | case TCP_SEQ_STATE_OPENREQ: |
| 2162 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); |
| 2163 | break; |
| 2164 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2165 | get_timewait6_sock(seq, v, st->num); |
| 2166 | break; |
| 2167 | } |
| 2168 | out: |
| 2169 | return 0; |
| 2170 | } |
| 2171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2173 | .name = "tcp6", |
| 2174 | .family = AF_INET6, |
Denis V. Lunev | 5f4472c | 2008-04-13 22:13:53 -0700 | [diff] [blame] | 2175 | .seq_fops = { |
| 2176 | .owner = THIS_MODULE, |
| 2177 | }, |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2178 | .seq_ops = { |
| 2179 | .show = tcp6_seq_show, |
| 2180 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | }; |
| 2182 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2183 | int __net_init tcp6_proc_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | { |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2185 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | } |
| 2187 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2188 | void tcp6_proc_exit(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | { |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2190 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | } |
| 2192 | #endif |
| 2193 | |
| 2194 | struct proto tcpv6_prot = { |
| 2195 | .name = "TCPv6", |
| 2196 | .owner = THIS_MODULE, |
| 2197 | .close = tcp_close, |
| 2198 | .connect = tcp_v6_connect, |
| 2199 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2200 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | .ioctl = tcp_ioctl, |
| 2202 | .init = tcp_v6_init_sock, |
| 2203 | .destroy = tcp_v6_destroy_sock, |
| 2204 | .shutdown = tcp_shutdown, |
| 2205 | .setsockopt = tcp_setsockopt, |
| 2206 | .getsockopt = tcp_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | .recvmsg = tcp_recvmsg, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2208 | .sendmsg = tcp_sendmsg, |
| 2209 | .sendpage = tcp_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | .backlog_rcv = tcp_v6_do_rcv, |
| 2211 | .hash = tcp_v6_hash, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2212 | .unhash = inet_unhash, |
| 2213 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2214 | .enter_memory_pressure = tcp_enter_memory_pressure, |
| 2215 | .sockets_allocated = &tcp_sockets_allocated, |
| 2216 | .memory_allocated = &tcp_memory_allocated, |
| 2217 | .memory_pressure = &tcp_memory_pressure, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2218 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | .sysctl_mem = sysctl_tcp_mem, |
| 2220 | .sysctl_wmem = sysctl_tcp_wmem, |
| 2221 | .sysctl_rmem = sysctl_tcp_rmem, |
| 2222 | .max_header = MAX_TCP_HEADER, |
| 2223 | .obj_size = sizeof(struct tcp6_sock), |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2224 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2225 | .twsk_prot = &tcp6_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2226 | .rsk_prot = &tcp6_request_sock_ops, |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 2227 | .h.hashinfo = &tcp_hashinfo, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2228 | .no_autobind = true, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2229 | #ifdef CONFIG_COMPAT |
| 2230 | .compat_setsockopt = compat_tcp_setsockopt, |
| 2231 | .compat_getsockopt = compat_tcp_getsockopt, |
| 2232 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | }; |
| 2234 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 2235 | static const struct inet6_protocol tcpv6_protocol = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | .handler = tcp_v6_rcv, |
| 2237 | .err_handler = tcp_v6_err, |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 2238 | .gso_send_check = tcp_v6_gso_send_check, |
Herbert Xu | adcfc7d | 2006-06-30 13:36:15 -0700 | [diff] [blame] | 2239 | .gso_segment = tcp_tso_segment, |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 2240 | .gro_receive = tcp6_gro_receive, |
| 2241 | .gro_complete = tcp6_gro_complete, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| 2243 | }; |
| 2244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | static struct inet_protosw tcpv6_protosw = { |
| 2246 | .type = SOCK_STREAM, |
| 2247 | .protocol = IPPROTO_TCP, |
| 2248 | .prot = &tcpv6_prot, |
| 2249 | .ops = &inet6_stream_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | .no_check = 0, |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 2251 | .flags = INET_PROTOSW_PERMANENT | |
| 2252 | INET_PROTOSW_ICSK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | }; |
| 2254 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2255 | static int __net_init tcpv6_net_init(struct net *net) |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2256 | { |
Denis V. Lunev | 5677242 | 2008-04-03 14:28:30 -0700 | [diff] [blame] | 2257 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
| 2258 | SOCK_RAW, IPPROTO_TCP, net); |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2259 | } |
| 2260 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2261 | static void __net_exit tcpv6_net_exit(struct net *net) |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2262 | { |
Denis V. Lunev | 5677242 | 2008-04-03 14:28:30 -0700 | [diff] [blame] | 2263 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2264 | } |
| 2265 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2266 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2267 | { |
| 2268 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2269 | } |
| 2270 | |
| 2271 | static struct pernet_operations tcpv6_net_ops = { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2272 | .init = tcpv6_net_init, |
| 2273 | .exit = tcpv6_net_exit, |
| 2274 | .exit_batch = tcpv6_net_exit_batch, |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2275 | }; |
| 2276 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2277 | int __init tcpv6_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | { |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2279 | int ret; |
David Woodhouse | ae0f7d5 | 2006-01-11 15:53:04 -0800 | [diff] [blame] | 2280 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2281 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
| 2282 | if (ret) |
| 2283 | goto out; |
| 2284 | |
| 2285 | /* register inet6 protocol */ |
| 2286 | ret = inet6_register_protosw(&tcpv6_protosw); |
| 2287 | if (ret) |
| 2288 | goto out_tcpv6_protocol; |
| 2289 | |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2290 | ret = register_pernet_subsys(&tcpv6_net_ops); |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2291 | if (ret) |
| 2292 | goto out_tcpv6_protosw; |
| 2293 | out: |
| 2294 | return ret; |
| 2295 | |
| 2296 | out_tcpv6_protocol: |
| 2297 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
| 2298 | out_tcpv6_protosw: |
| 2299 | inet6_unregister_protosw(&tcpv6_protosw); |
| 2300 | goto out; |
| 2301 | } |
| 2302 | |
Daniel Lezcano | 09f7709 | 2007-12-13 05:34:58 -0800 | [diff] [blame] | 2303 | void tcpv6_exit(void) |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2304 | { |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2305 | unregister_pernet_subsys(&tcpv6_net_ops); |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2306 | inet6_unregister_protosw(&tcpv6_protosw); |
| 2307 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2308 | } |