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> |
David S. Miller | 6e5714e | 2011-08-03 20:50:44 -0700 | [diff] [blame] | 64 | #include <net/secure_seq.h> |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 65 | #include <net/tcp_memcontrol.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
| 67 | #include <asm/uaccess.h> |
| 68 | |
| 69 | #include <linux/proc_fs.h> |
| 70 | #include <linux/seq_file.h> |
| 71 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 72 | #include <linux/crypto.h> |
| 73 | #include <linux/scatterlist.h> |
| 74 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 75 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 76 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
| 77 | struct request_sock *req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | 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] | 80 | static void __tcp_v6_send_check(struct sk_buff *skb, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 81 | const struct in6_addr *saddr, |
| 82 | const struct in6_addr *daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 84 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
| 85 | static const struct inet_connection_sock_af_ops ipv6_specific; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 86 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 87 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
| 88 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 89 | #else |
| 90 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 91 | const struct in6_addr *addr) |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 92 | { |
| 93 | return NULL; |
| 94 | } |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 95 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | static void tcp_v6_hash(struct sock *sk) |
| 98 | { |
| 99 | if (sk->sk_state != TCP_CLOSE) { |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 100 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | tcp_prot.hash(sk); |
| 102 | return; |
| 103 | } |
| 104 | local_bh_disable(); |
Eric Dumazet | 9327f70 | 2009-12-04 03:46:54 +0000 | [diff] [blame] | 105 | __inet6_hash(sk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | local_bh_enable(); |
| 107 | } |
| 108 | } |
| 109 | |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 110 | static __inline__ __sum16 tcp_v6_check(int len, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 111 | const struct in6_addr *saddr, |
| 112 | const struct in6_addr *daddr, |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 113 | __wsum base) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
| 115 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); |
| 116 | } |
| 117 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 118 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 120 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
| 121 | ipv6_hdr(skb)->saddr.s6_addr32, |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 122 | tcp_hdr(skb)->dest, |
| 123 | tcp_hdr(skb)->source); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | } |
| 125 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 126 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | int addr_len) |
| 128 | { |
| 129 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 130 | struct inet_sock *inet = inet_sk(sk); |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 131 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 133 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 134 | struct in6_addr *saddr = NULL, *final_p, final; |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 135 | struct rt6_info *rt; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 136 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | struct dst_entry *dst; |
| 138 | int addr_type; |
| 139 | int err; |
| 140 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 141 | if (addr_len < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | return -EINVAL; |
| 143 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 144 | if (usin->sin6_family != AF_INET6) |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 145 | return -EAFNOSUPPORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 147 | memset(&fl6, 0, sizeof(fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
| 149 | if (np->sndflow) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 150 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| 151 | IP6_ECN_flow_init(fl6.flowlabel); |
| 152 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | struct ip6_flowlabel *flowlabel; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 154 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | if (flowlabel == NULL) |
| 156 | return -EINVAL; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 157 | usin->sin6_addr = flowlabel->dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | fl6_sock_release(flowlabel); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 163 | * connect() to INADDR_ANY means loopback (BSD'ism). |
| 164 | */ |
| 165 | |
| 166 | if(ipv6_addr_any(&usin->sin6_addr)) |
| 167 | usin->sin6_addr.s6_addr[15] = 0x1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
| 169 | addr_type = ipv6_addr_type(&usin->sin6_addr); |
| 170 | |
| 171 | if(addr_type & IPV6_ADDR_MULTICAST) |
| 172 | return -ENETUNREACH; |
| 173 | |
| 174 | if (addr_type&IPV6_ADDR_LINKLOCAL) { |
| 175 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 176 | usin->sin6_scope_id) { |
| 177 | /* If interface is set while binding, indices |
| 178 | * must coincide. |
| 179 | */ |
| 180 | if (sk->sk_bound_dev_if && |
| 181 | sk->sk_bound_dev_if != usin->sin6_scope_id) |
| 182 | return -EINVAL; |
| 183 | |
| 184 | sk->sk_bound_dev_if = usin->sin6_scope_id; |
| 185 | } |
| 186 | |
| 187 | /* Connect to link-local address requires an interface */ |
| 188 | if (!sk->sk_bound_dev_if) |
| 189 | return -EINVAL; |
| 190 | } |
| 191 | |
| 192 | if (tp->rx_opt.ts_recent_stamp && |
| 193 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { |
| 194 | tp->rx_opt.ts_recent = 0; |
| 195 | tp->rx_opt.ts_recent_stamp = 0; |
| 196 | tp->write_seq = 0; |
| 197 | } |
| 198 | |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 199 | np->daddr = usin->sin6_addr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 200 | np->flow_label = fl6.flowlabel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
| 202 | /* |
| 203 | * TCP over IPv4 |
| 204 | */ |
| 205 | |
| 206 | if (addr_type == IPV6_ADDR_MAPPED) { |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 207 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | struct sockaddr_in sin; |
| 209 | |
| 210 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); |
| 211 | |
| 212 | if (__ipv6_only_sock(sk)) |
| 213 | return -ENETUNREACH; |
| 214 | |
| 215 | sin.sin_family = AF_INET; |
| 216 | sin.sin_port = usin->sin6_port; |
| 217 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
| 218 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 219 | icsk->icsk_af_ops = &ipv6_mapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 221 | #ifdef CONFIG_TCP_MD5SIG |
| 222 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; |
| 223 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
| 225 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); |
| 226 | |
| 227 | if (err) { |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 228 | icsk->icsk_ext_hdr_len = exthdrlen; |
| 229 | icsk->icsk_af_ops = &ipv6_specific; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 231 | #ifdef CONFIG_TCP_MD5SIG |
| 232 | tp->af_specific = &tcp_sock_ipv6_specific; |
| 233 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | goto failure; |
| 235 | } else { |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 236 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
| 237 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
| 238 | &np->rcv_saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | } |
| 240 | |
| 241 | return err; |
| 242 | } |
| 243 | |
| 244 | if (!ipv6_addr_any(&np->rcv_saddr)) |
| 245 | saddr = &np->rcv_saddr; |
| 246 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 247 | fl6.flowi6_proto = IPPROTO_TCP; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 248 | fl6.daddr = np->daddr; |
| 249 | fl6.saddr = saddr ? *saddr : np->saddr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 250 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
| 251 | fl6.flowi6_mark = sk->sk_mark; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 252 | fl6.fl6_dport = usin->sin6_port; |
| 253 | fl6.fl6_sport = inet->inet_sport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 255 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 257 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 258 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 259 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 260 | if (IS_ERR(dst)) { |
| 261 | err = PTR_ERR(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | goto failure; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 263 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
| 265 | if (saddr == NULL) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 266 | saddr = &fl6.saddr; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 267 | np->rcv_saddr = *saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | } |
| 269 | |
| 270 | /* set the source address */ |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 271 | np->saddr = *saddr; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 272 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | |
Herbert Xu | f83ef8c | 2006-06-30 13:37:03 -0700 | [diff] [blame] | 274 | sk->sk_gso_type = SKB_GSO_TCPV6; |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 275 | __ip6_dst_store(sk, dst, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 277 | rt = (struct rt6_info *) dst; |
| 278 | if (tcp_death_row.sysctl_tw_recycle && |
| 279 | !tp->rx_opt.ts_recent_stamp && |
| 280 | ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) { |
| 281 | struct inet_peer *peer = rt6_get_peer(rt); |
| 282 | /* |
| 283 | * VJ's idea. We save last timestamp seen from |
| 284 | * the destination in peer table, when entering state |
| 285 | * TIME-WAIT * and initialize rx_opt.ts_recent from it, |
| 286 | * when trying new connection. |
| 287 | */ |
| 288 | if (peer) { |
| 289 | inet_peer_refcheck(peer); |
| 290 | if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) { |
| 291 | tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; |
| 292 | tp->rx_opt.ts_recent = peer->tcp_ts; |
| 293 | } |
| 294 | } |
| 295 | } |
| 296 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 297 | icsk->icsk_ext_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | if (np->opt) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 299 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
| 300 | np->opt->opt_nflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
| 302 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| 303 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 304 | inet->inet_dport = usin->sin6_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | tcp_set_state(sk, TCP_SYN_SENT); |
Arnaldo Carvalho de Melo | d8313f5 | 2005-12-13 23:25:44 -0800 | [diff] [blame] | 307 | err = inet6_hash_connect(&tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | if (err) |
| 309 | goto late_failure; |
| 310 | |
| 311 | if (!tp->write_seq) |
| 312 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
| 313 | np->daddr.s6_addr32, |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 314 | inet->inet_sport, |
| 315 | inet->inet_dport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | err = tcp_connect(sk); |
| 318 | if (err) |
| 319 | goto late_failure; |
| 320 | |
| 321 | return 0; |
| 322 | |
| 323 | late_failure: |
| 324 | tcp_set_state(sk, TCP_CLOSE); |
| 325 | __sk_dst_reset(sk); |
| 326 | failure: |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 327 | inet->inet_dport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | sk->sk_route_caps = 0; |
| 329 | return err; |
| 330 | } |
| 331 | |
| 332 | 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] | 333 | u8 type, u8 code, int offset, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 335 | const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 336 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | struct ipv6_pinfo *np; |
| 338 | struct sock *sk; |
| 339 | int err; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 340 | struct tcp_sock *tp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | __u32 seq; |
Pavel Emelyanov | ca12a1a | 2008-07-16 20:28:42 -0700 | [diff] [blame] | 342 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
Pavel Emelyanov | ca12a1a | 2008-07-16 20:28:42 -0700 | [diff] [blame] | 344 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
Pavel Emelyanov | d86e0da | 2008-01-31 05:07:21 -0800 | [diff] [blame] | 345 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | |
| 347 | if (sk == NULL) { |
Denis V. Lunev | e41b536 | 2008-10-08 10:33:26 -0700 | [diff] [blame] | 348 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
| 349 | ICMP6_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | return; |
| 351 | } |
| 352 | |
| 353 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 354 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | return; |
| 356 | } |
| 357 | |
| 358 | bh_lock_sock(sk); |
| 359 | if (sock_owned_by_user(sk)) |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 360 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | if (sk->sk_state == TCP_CLOSE) |
| 363 | goto out; |
| 364 | |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 365 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
| 366 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
| 367 | goto out; |
| 368 | } |
| 369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | tp = tcp_sk(sk); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 371 | seq = ntohl(th->seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | if (sk->sk_state != TCP_LISTEN && |
| 373 | !between(seq, tp->snd_una, tp->snd_nxt)) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 374 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | goto out; |
| 376 | } |
| 377 | |
| 378 | np = inet6_sk(sk); |
| 379 | |
| 380 | if (type == ICMPV6_PKT_TOOBIG) { |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 381 | struct dst_entry *dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
| 383 | if (sock_owned_by_user(sk)) |
| 384 | goto out; |
| 385 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) |
| 386 | goto out; |
| 387 | |
| 388 | /* icmp should have updated the destination cache entry */ |
| 389 | dst = __sk_dst_check(sk, np->dst_cookie); |
| 390 | |
| 391 | if (dst == NULL) { |
| 392 | struct inet_sock *inet = inet_sk(sk); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 393 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | /* BUGGG_FUTURE: Again, it is not clear how |
| 396 | to handle rthdr case. Ignore this complexity |
| 397 | for now. |
| 398 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 399 | memset(&fl6, 0, sizeof(fl6)); |
| 400 | fl6.flowi6_proto = IPPROTO_TCP; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 401 | fl6.daddr = np->daddr; |
| 402 | fl6.saddr = np->saddr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 403 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
| 404 | fl6.flowi6_mark = sk->sk_mark; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 405 | fl6.fl6_dport = inet->inet_dport; |
| 406 | fl6.fl6_sport = inet->inet_sport; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 407 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 409 | dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 410 | if (IS_ERR(dst)) { |
| 411 | sk->sk_err_soft = -PTR_ERR(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | goto out; |
| 413 | } |
| 414 | |
| 415 | } else |
| 416 | dst_hold(dst); |
| 417 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 418 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | tcp_sync_mss(sk, dst_mtu(dst)); |
| 420 | tcp_simple_retransmit(sk); |
| 421 | } /* else let the usual retransmit timer handle it */ |
| 422 | dst_release(dst); |
| 423 | goto out; |
| 424 | } |
| 425 | |
| 426 | icmpv6_err_convert(type, code, &err); |
| 427 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 428 | /* Might be for an request_sock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | switch (sk->sk_state) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 430 | struct request_sock *req, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | case TCP_LISTEN: |
| 432 | if (sock_owned_by_user(sk)) |
| 433 | goto out; |
| 434 | |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 435 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
| 436 | &hdr->saddr, inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | if (!req) |
| 438 | goto out; |
| 439 | |
| 440 | /* ICMPs are not backlogged, hence we cannot get |
| 441 | * an established socket here. |
| 442 | */ |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 443 | WARN_ON(req->sk != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 445 | if (seq != tcp_rsk(req)->snt_isn) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 446 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | goto out; |
| 448 | } |
| 449 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 450 | inet_csk_reqsk_queue_drop(sk, req, prev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | goto out; |
| 452 | |
| 453 | case TCP_SYN_SENT: |
| 454 | case TCP_SYN_RECV: /* Cannot happen. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 455 | It can, it SYNs are crossed. --ANK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | sk->sk_err = err; |
| 458 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ |
| 459 | |
| 460 | tcp_done(sk); |
| 461 | } else |
| 462 | sk->sk_err_soft = err; |
| 463 | goto out; |
| 464 | } |
| 465 | |
| 466 | if (!sock_owned_by_user(sk) && np->recverr) { |
| 467 | sk->sk_err = err; |
| 468 | sk->sk_error_report(sk); |
| 469 | } else |
| 470 | sk->sk_err_soft = err; |
| 471 | |
| 472 | out: |
| 473 | bh_unlock_sock(sk); |
| 474 | sock_put(sk); |
| 475 | } |
| 476 | |
| 477 | |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 478 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
Eric Dumazet | fff3269 | 2012-06-01 01:47:50 +0000 | [diff] [blame] | 479 | struct request_values *rvp, |
| 480 | u16 queue_mapping) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | { |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 482 | struct inet6_request_sock *treq = inet6_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 484 | struct sk_buff * skb; |
| 485 | struct ipv6_txoptions *opt = NULL; |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 486 | struct in6_addr * final_p, final; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 487 | struct flowi6 fl6; |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 488 | struct dst_entry *dst; |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 489 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 491 | memset(&fl6, 0, sizeof(fl6)); |
| 492 | fl6.flowi6_proto = IPPROTO_TCP; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 493 | fl6.daddr = treq->rmt_addr; |
| 494 | fl6.saddr = treq->loc_addr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 495 | fl6.flowlabel = 0; |
| 496 | fl6.flowi6_oif = treq->iif; |
| 497 | fl6.flowi6_mark = sk->sk_mark; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 498 | fl6.fl6_dport = inet_rsk(req)->rmt_port; |
| 499 | fl6.fl6_sport = inet_rsk(req)->loc_port; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 500 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 502 | opt = np->opt; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 503 | final_p = fl6_update_dst(&fl6, opt, &final); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 505 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 506 | if (IS_ERR(dst)) { |
| 507 | err = PTR_ERR(dst); |
Boris Ostrovsky | 738faca | 2011-04-04 13:07:26 -0700 | [diff] [blame] | 508 | dst = NULL; |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 509 | goto done; |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 510 | } |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 511 | skb = tcp_make_synack(sk, dst, req, rvp); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 512 | err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | if (skb) { |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 514 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 516 | fl6.daddr = treq->rmt_addr; |
Eric Dumazet | fff3269 | 2012-06-01 01:47:50 +0000 | [diff] [blame] | 517 | skb_set_queue_mapping(skb, queue_mapping); |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 518 | err = ip6_xmit(sk, skb, &fl6, opt, np->tclass); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 519 | err = net_xmit_eval(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | } |
| 521 | |
| 522 | done: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 523 | if (opt && opt != np->opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | sock_kfree_s(sk, opt, opt->tot_len); |
Eric W. Biederman | 78b9104 | 2006-01-31 17:51:44 -0800 | [diff] [blame] | 525 | dst_release(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | return err; |
| 527 | } |
| 528 | |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 529 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, |
| 530 | struct request_values *rvp) |
| 531 | { |
| 532 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); |
Eric Dumazet | fff3269 | 2012-06-01 01:47:50 +0000 | [diff] [blame] | 533 | return tcp_v6_send_synack(sk, req, rvp, 0); |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 534 | } |
| 535 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 536 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | { |
Wei Yongjun | 800d55f | 2009-02-23 21:45:33 +0000 | [diff] [blame] | 538 | kfree_skb(inet6_rsk(req)->pktopts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | } |
| 540 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 541 | #ifdef CONFIG_TCP_MD5SIG |
| 542 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 543 | const struct in6_addr *addr) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 544 | { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 545 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, |
| 549 | struct sock *addr_sk) |
| 550 | { |
| 551 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); |
| 552 | } |
| 553 | |
| 554 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, |
| 555 | struct request_sock *req) |
| 556 | { |
| 557 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); |
| 558 | } |
| 559 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 560 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, |
| 561 | int optlen) |
| 562 | { |
| 563 | struct tcp_md5sig cmd; |
| 564 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 565 | |
| 566 | if (optlen < sizeof(cmd)) |
| 567 | return -EINVAL; |
| 568 | |
| 569 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
| 570 | return -EFAULT; |
| 571 | |
| 572 | if (sin6->sin6_family != AF_INET6) |
| 573 | return -EINVAL; |
| 574 | |
| 575 | if (!cmd.tcpm_keylen) { |
Brian Haley | e773e4f | 2007-08-24 23:16:08 -0700 | [diff] [blame] | 576 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 577 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
| 578 | AF_INET); |
| 579 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
| 580 | AF_INET6); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 581 | } |
| 582 | |
| 583 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 584 | return -EINVAL; |
| 585 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 586 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
| 587 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
| 588 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 589 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 590 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
| 591 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 592 | } |
| 593 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 594 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 595 | const struct in6_addr *daddr, |
| 596 | const struct in6_addr *saddr, int nbytes) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 597 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 598 | struct tcp6_pseudohdr *bp; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 599 | struct scatterlist sg; |
YOSHIFUJI Hideaki | 8d26d76 | 2008-04-17 13:19:16 +0900 | [diff] [blame] | 600 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 601 | bp = &hp->md5_blk.ip6; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 602 | /* 1. TCP pseudo-header (RFC2460) */ |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 603 | bp->saddr = *saddr; |
| 604 | bp->daddr = *daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 605 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
Adam Langley | 00b1304 | 2008-07-31 21:36:07 -0700 | [diff] [blame] | 606 | bp->len = cpu_to_be32(nbytes); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 607 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 608 | sg_init_one(&sg, bp, sizeof(*bp)); |
| 609 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); |
| 610 | } |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 611 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 612 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 613 | const struct in6_addr *daddr, struct in6_addr *saddr, |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 614 | const struct tcphdr *th) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 615 | { |
| 616 | struct tcp_md5sig_pool *hp; |
| 617 | struct hash_desc *desc; |
| 618 | |
| 619 | hp = tcp_get_md5sig_pool(); |
| 620 | if (!hp) |
| 621 | goto clear_hash_noput; |
| 622 | desc = &hp->md5_desc; |
| 623 | |
| 624 | if (crypto_hash_init(desc)) |
| 625 | goto clear_hash; |
| 626 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) |
| 627 | goto clear_hash; |
| 628 | if (tcp_md5_hash_header(hp, th)) |
| 629 | goto clear_hash; |
| 630 | if (tcp_md5_hash_key(hp, key)) |
| 631 | goto clear_hash; |
| 632 | if (crypto_hash_final(desc, md5_hash)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 633 | goto clear_hash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 634 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 635 | tcp_put_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 636 | return 0; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 637 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 638 | clear_hash: |
| 639 | tcp_put_md5sig_pool(); |
| 640 | clear_hash_noput: |
| 641 | memset(md5_hash, 0, 16); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 642 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 643 | } |
| 644 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 645 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 646 | const struct sock *sk, |
| 647 | const struct request_sock *req, |
| 648 | const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 649 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 650 | const struct in6_addr *saddr, *daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 651 | struct tcp_md5sig_pool *hp; |
| 652 | struct hash_desc *desc; |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 653 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 654 | |
| 655 | if (sk) { |
| 656 | saddr = &inet6_sk(sk)->saddr; |
| 657 | daddr = &inet6_sk(sk)->daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 658 | } else if (req) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 659 | saddr = &inet6_rsk(req)->loc_addr; |
| 660 | daddr = &inet6_rsk(req)->rmt_addr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 661 | } else { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 662 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 663 | saddr = &ip6h->saddr; |
| 664 | daddr = &ip6h->daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 665 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 666 | |
| 667 | hp = tcp_get_md5sig_pool(); |
| 668 | if (!hp) |
| 669 | goto clear_hash_noput; |
| 670 | desc = &hp->md5_desc; |
| 671 | |
| 672 | if (crypto_hash_init(desc)) |
| 673 | goto clear_hash; |
| 674 | |
| 675 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) |
| 676 | goto clear_hash; |
| 677 | if (tcp_md5_hash_header(hp, th)) |
| 678 | goto clear_hash; |
| 679 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) |
| 680 | goto clear_hash; |
| 681 | if (tcp_md5_hash_key(hp, key)) |
| 682 | goto clear_hash; |
| 683 | if (crypto_hash_final(desc, md5_hash)) |
| 684 | goto clear_hash; |
| 685 | |
| 686 | tcp_put_md5sig_pool(); |
| 687 | return 0; |
| 688 | |
| 689 | clear_hash: |
| 690 | tcp_put_md5sig_pool(); |
| 691 | clear_hash_noput: |
| 692 | memset(md5_hash, 0, 16); |
| 693 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 694 | } |
| 695 | |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 696 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 697 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 698 | const __u8 *hash_location = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 699 | struct tcp_md5sig_key *hash_expected; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 700 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 701 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 702 | int genhash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 703 | u8 newhash[16]; |
| 704 | |
| 705 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); |
YOSHIFUJI Hideaki | 7d5d552 | 2008-04-17 12:29:53 +0900 | [diff] [blame] | 706 | hash_location = tcp_parse_md5sig_option(th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 707 | |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 708 | /* We've parsed the options - do we have a hash? */ |
| 709 | if (!hash_expected && !hash_location) |
| 710 | return 0; |
| 711 | |
| 712 | if (hash_expected && !hash_location) { |
| 713 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 714 | return 1; |
| 715 | } |
| 716 | |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 717 | if (!hash_expected && hash_location) { |
| 718 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 719 | return 1; |
| 720 | } |
| 721 | |
| 722 | /* check the signature */ |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 723 | genhash = tcp_v6_md5_hash_skb(newhash, |
| 724 | hash_expected, |
| 725 | NULL, NULL, skb); |
| 726 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 727 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 728 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
| 729 | genhash ? "failed" : "mismatch", |
| 730 | &ip6h->saddr, ntohs(th->source), |
| 731 | &ip6h->daddr, ntohs(th->dest)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 732 | return 1; |
| 733 | } |
| 734 | return 0; |
| 735 | } |
| 736 | #endif |
| 737 | |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 738 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | .family = AF_INET6, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 740 | .obj_size = sizeof(struct tcp6_request_sock), |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 741 | .rtx_syn_ack = tcp_v6_rtx_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 742 | .send_ack = tcp_v6_reqsk_send_ack, |
| 743 | .destructor = tcp_v6_reqsk_destructor, |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 744 | .send_reset = tcp_v6_send_reset, |
| 745 | .syn_ack_timeout = tcp_syn_ack_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | }; |
| 747 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 748 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 749 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 750 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
John Dykstra | e3afe7b | 2009-07-16 05:04:51 +0000 | [diff] [blame] | 751 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 752 | }; |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 753 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 754 | |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 755 | static void __tcp_v6_send_check(struct sk_buff *skb, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 756 | const struct in6_addr *saddr, const struct in6_addr *daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 758 | struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 760 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 761 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
Herbert Xu | 663ead3 | 2007-04-09 11:59:07 -0700 | [diff] [blame] | 762 | skb->csum_start = skb_transport_header(skb) - skb->head; |
Al Viro | ff1dcad | 2006-11-20 18:07:29 -0800 | [diff] [blame] | 763 | skb->csum_offset = offsetof(struct tcphdr, check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } else { |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 765 | th->check = tcp_v6_check(skb->len, saddr, daddr, |
| 766 | csum_partial(th, th->doff << 2, |
| 767 | skb->csum)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | } |
| 769 | } |
| 770 | |
Herbert Xu | bb29624 | 2010-04-11 02:15:55 +0000 | [diff] [blame] | 771 | 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] | 772 | { |
| 773 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 774 | |
| 775 | __tcp_v6_send_check(skb, &np->saddr, &np->daddr); |
| 776 | } |
| 777 | |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 778 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
| 779 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 780 | const struct ipv6hdr *ipv6h; |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 781 | struct tcphdr *th; |
| 782 | |
| 783 | if (!pskb_may_pull(skb, sizeof(*th))) |
| 784 | return -EINVAL; |
| 785 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 786 | ipv6h = ipv6_hdr(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 787 | th = tcp_hdr(skb); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 788 | |
| 789 | th->check = 0; |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 790 | skb->ip_summed = CHECKSUM_PARTIAL; |
Herbert Xu | 8ad50d9 | 2010-04-11 02:15:54 +0000 | [diff] [blame] | 791 | __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 792 | return 0; |
| 793 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
Herbert Xu | 3699067 | 2009-05-22 00:45:28 -0700 | [diff] [blame] | 795 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
| 796 | struct sk_buff *skb) |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 797 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 798 | const struct ipv6hdr *iph = skb_gro_network_header(skb); |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 799 | |
| 800 | switch (skb->ip_summed) { |
| 801 | case CHECKSUM_COMPLETE: |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 802 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 803 | skb->csum)) { |
| 804 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 805 | break; |
| 806 | } |
| 807 | |
| 808 | /* fall through */ |
| 809 | case CHECKSUM_NONE: |
| 810 | NAPI_GRO_CB(skb)->flush = 1; |
| 811 | return NULL; |
| 812 | } |
| 813 | |
| 814 | return tcp_gro_receive(head, skb); |
| 815 | } |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 816 | |
Herbert Xu | 3699067 | 2009-05-22 00:45:28 -0700 | [diff] [blame] | 817 | static int tcp6_gro_complete(struct sk_buff *skb) |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 818 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 819 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 820 | struct tcphdr *th = tcp_hdr(skb); |
| 821 | |
| 822 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), |
| 823 | &iph->saddr, &iph->daddr, 0); |
| 824 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
| 825 | |
| 826 | return tcp_gro_complete(skb); |
| 827 | } |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 828 | |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 829 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 830 | u32 ts, struct tcp_md5sig_key *key, int rst, u8 tclass) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 832 | const struct tcphdr *th = tcp_hdr(skb); |
| 833 | struct tcphdr *t1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | struct sk_buff *buff; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 835 | struct flowi6 fl6; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 836 | struct net *net = dev_net(skb_dst(skb)->dev); |
Daniel Lezcano | e504799 | 2008-03-07 11:16:26 -0800 | [diff] [blame] | 837 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
YOSHIFUJI Hideaki | 9cb5734 | 2008-01-12 02:16:03 -0800 | [diff] [blame] | 838 | unsigned int tot_len = sizeof(struct tcphdr); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 839 | struct dst_entry *dst; |
Al Viro | e69a4ad | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 840 | __be32 *topt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
| 842 | if (ts) |
YOSHIFUJI Hideaki | 4244f8a | 2006-10-10 19:40:50 -0700 | [diff] [blame] | 843 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 844 | #ifdef CONFIG_TCP_MD5SIG |
| 845 | if (key) |
| 846 | tot_len += TCPOLEN_MD5SIG_ALIGNED; |
| 847 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
| 849 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
| 850 | GFP_ATOMIC); |
| 851 | if (buff == NULL) |
| 852 | return; |
| 853 | |
| 854 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
| 855 | |
Ilpo Järvinen | 77c676d | 2008-10-09 14:41:38 -0700 | [diff] [blame] | 856 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
Herbert Xu | 6651ffc | 2010-04-21 00:47:15 -0700 | [diff] [blame] | 857 | skb_reset_transport_header(buff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | |
| 859 | /* Swap the send and the receive. */ |
| 860 | memset(t1, 0, sizeof(*t1)); |
| 861 | t1->dest = th->source; |
| 862 | t1->source = th->dest; |
Ilpo Järvinen | 77c676d | 2008-10-09 14:41:38 -0700 | [diff] [blame] | 863 | t1->doff = tot_len / 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | t1->seq = htonl(seq); |
| 865 | t1->ack_seq = htonl(ack); |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 866 | t1->ack = !rst || !th->ack; |
| 867 | t1->rst = rst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | t1->window = htons(win); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 869 | |
Al Viro | e69a4ad | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 870 | topt = (__be32 *)(t1 + 1); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | if (ts) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 873 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 874 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); |
| 875 | *topt++ = htonl(tcp_time_stamp); |
Ilpo Järvinen | 53b1257 | 2008-10-08 14:36:33 -0700 | [diff] [blame] | 876 | *topt++ = htonl(ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | } |
| 878 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 879 | #ifdef CONFIG_TCP_MD5SIG |
| 880 | if (key) { |
| 881 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 882 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 883 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, |
Adam Langley | 90b7e11 | 2008-07-31 20:49:48 -0700 | [diff] [blame] | 884 | &ipv6_hdr(skb)->saddr, |
| 885 | &ipv6_hdr(skb)->daddr, t1); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 886 | } |
| 887 | #endif |
| 888 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 889 | memset(&fl6, 0, sizeof(fl6)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 890 | fl6.daddr = ipv6_hdr(skb)->saddr; |
| 891 | fl6.saddr = ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | |
David S. Miller | e5700af | 2010-04-21 14:59:20 -0700 | [diff] [blame] | 893 | buff->ip_summed = CHECKSUM_PARTIAL; |
| 894 | buff->csum = 0; |
| 895 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 896 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 898 | fl6.flowi6_proto = IPPROTO_TCP; |
| 899 | fl6.flowi6_oif = inet6_iif(skb); |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 900 | fl6.fl6_dport = t1->dest; |
| 901 | fl6.fl6_sport = t1->source; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 902 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 904 | /* Pass a socket to ip6_dst_lookup either it is for RST |
| 905 | * Underlying function will use this to retrieve the network |
| 906 | * namespace |
| 907 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 908 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 909 | if (!IS_ERR(dst)) { |
| 910 | skb_dst_set(buff, dst); |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 911 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 912 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
| 913 | if (rst) |
| 914 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); |
| 915 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } |
| 917 | |
| 918 | kfree_skb(buff); |
| 919 | } |
| 920 | |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 921 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
| 922 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 923 | const struct tcphdr *th = tcp_hdr(skb); |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 924 | u32 seq = 0, ack_seq = 0; |
Guo-Fu Tseng | fa3e5b4 | 2008-10-09 21:11:56 -0700 | [diff] [blame] | 925 | struct tcp_md5sig_key *key = NULL; |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 926 | #ifdef CONFIG_TCP_MD5SIG |
| 927 | const __u8 *hash_location = NULL; |
| 928 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
| 929 | unsigned char newhash[16]; |
| 930 | int genhash; |
| 931 | struct sock *sk1 = NULL; |
| 932 | #endif |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 933 | |
| 934 | if (th->rst) |
| 935 | return; |
| 936 | |
| 937 | if (!ipv6_unicast_destination(skb)) |
| 938 | return; |
| 939 | |
| 940 | #ifdef CONFIG_TCP_MD5SIG |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 941 | hash_location = tcp_parse_md5sig_option(th); |
| 942 | if (!sk && hash_location) { |
| 943 | /* |
| 944 | * active side is lost. Try to find listening socket through |
| 945 | * source port, and then find md5 key through listening socket. |
| 946 | * we are not loose security here: |
| 947 | * Incoming packet is checked with md5 hash with finding key, |
| 948 | * no RST generated if md5 hash doesn't match. |
| 949 | */ |
| 950 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), |
| 951 | &tcp_hashinfo, &ipv6h->daddr, |
| 952 | ntohs(th->source), inet6_iif(skb)); |
| 953 | if (!sk1) |
| 954 | return; |
| 955 | |
| 956 | rcu_read_lock(); |
| 957 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); |
| 958 | if (!key) |
| 959 | goto release_sk1; |
| 960 | |
| 961 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); |
| 962 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
| 963 | goto release_sk1; |
| 964 | } else { |
| 965 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; |
| 966 | } |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 967 | #endif |
| 968 | |
| 969 | if (th->ack) |
| 970 | seq = ntohl(th->ack_seq); |
| 971 | else |
| 972 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - |
| 973 | (th->doff << 2); |
| 974 | |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 975 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1, 0); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 976 | |
| 977 | #ifdef CONFIG_TCP_MD5SIG |
| 978 | release_sk1: |
| 979 | if (sk1) { |
| 980 | rcu_read_unlock(); |
| 981 | sock_put(sk1); |
| 982 | } |
| 983 | #endif |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 984 | } |
| 985 | |
| 986 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 987 | struct tcp_md5sig_key *key, u8 tclass) |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 988 | { |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 989 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0, tclass); |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 990 | } |
| 991 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 993 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 994 | struct inet_timewait_sock *tw = inet_twsk(sk); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 995 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 997 | 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] | 998 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 999 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw), |
| 1000 | tw->tw_tclass); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1002 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | } |
| 1004 | |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 1005 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
| 1006 | struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | { |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 1008 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 1009 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | } |
| 1011 | |
| 1012 | |
| 1013 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
| 1014 | { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1015 | struct request_sock *req, **prev; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1016 | const struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | struct sock *nsk; |
| 1018 | |
| 1019 | /* Find possible connection requests. */ |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 1020 | req = inet6_csk_search_req(sk, &prev, th->source, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1021 | &ipv6_hdr(skb)->saddr, |
| 1022 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | if (req) |
| 1024 | return tcp_check_req(sk, skb, req, prev); |
| 1025 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1026 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
Pavel Emelyanov | d86e0da | 2008-01-31 05:07:21 -0800 | [diff] [blame] | 1027 | &ipv6_hdr(skb)->saddr, th->source, |
| 1028 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
| 1030 | if (nsk) { |
| 1031 | if (nsk->sk_state != TCP_TIME_WAIT) { |
| 1032 | bh_lock_sock(nsk); |
| 1033 | return nsk; |
| 1034 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1035 | inet_twsk_put(inet_twsk(nsk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | return NULL; |
| 1037 | } |
| 1038 | |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1039 | #ifdef CONFIG_SYN_COOKIES |
Florian Westphal | af9b473 | 2010-06-03 00:43:44 +0000 | [diff] [blame] | 1040 | if (!th->syn) |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1041 | sk = cookie_v6_check(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | #endif |
| 1043 | return sk; |
| 1044 | } |
| 1045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | /* FIXME: this is substantially similar to the ipv4 code. |
| 1047 | * Can some kind of merge be done? -- erics |
| 1048 | */ |
| 1049 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1050 | { |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1051 | struct tcp_extend_values tmp_ext; |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1052 | struct tcp_options_received tmp_opt; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1053 | const u8 *hash_location; |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1054 | struct request_sock *req; |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1055 | struct inet6_request_sock *treq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | struct ipv6_pinfo *np = inet6_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | struct tcp_sock *tp = tcp_sk(sk); |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1058 | __u32 isn = TCP_SKB_CB(skb)->when; |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1059 | struct dst_entry *dst = NULL; |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1060 | bool want_cookie = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | |
| 1062 | if (skb->protocol == htons(ETH_P_IP)) |
| 1063 | return tcp_v4_conn_request(sk, skb); |
| 1064 | |
| 1065 | if (!ipv6_unicast_destination(skb)) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1066 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1068 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
Eric Dumazet | 946cedc | 2011-08-30 03:21:44 +0000 | [diff] [blame] | 1069 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
| 1070 | if (!want_cookie) |
| 1071 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | } |
| 1073 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1074 | 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] | 1075 | goto drop; |
| 1076 | |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1077 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | if (req == NULL) |
| 1079 | goto drop; |
| 1080 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1081 | #ifdef CONFIG_TCP_MD5SIG |
| 1082 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; |
| 1083 | #endif |
| 1084 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | tcp_clear_options(&tmp_opt); |
| 1086 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| 1087 | tmp_opt.user_mss = tp->rx_opt.user_mss; |
David S. Miller | bb5b7c1 | 2009-12-15 20:56:42 -0800 | [diff] [blame] | 1088 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1090 | if (tmp_opt.cookie_plus > 0 && |
| 1091 | tmp_opt.saw_tstamp && |
| 1092 | !tp->rx_opt.cookie_out_never && |
| 1093 | (sysctl_tcp_cookie_size > 0 || |
| 1094 | (tp->cookie_values != NULL && |
| 1095 | tp->cookie_values->cookie_desired > 0))) { |
| 1096 | u8 *c; |
| 1097 | u32 *d; |
| 1098 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; |
| 1099 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; |
| 1100 | |
| 1101 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) |
| 1102 | goto drop_and_free; |
| 1103 | |
| 1104 | /* Secret recipe starts with IP addresses */ |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 1105 | d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1106 | *mess++ ^= *d++; |
| 1107 | *mess++ ^= *d++; |
| 1108 | *mess++ ^= *d++; |
| 1109 | *mess++ ^= *d++; |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 1110 | d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1111 | *mess++ ^= *d++; |
| 1112 | *mess++ ^= *d++; |
| 1113 | *mess++ ^= *d++; |
| 1114 | *mess++ ^= *d++; |
| 1115 | |
| 1116 | /* plus variable length Initiator Cookie */ |
| 1117 | c = (u8 *)mess; |
| 1118 | while (l-- > 0) |
| 1119 | *c++ ^= *hash_location++; |
| 1120 | |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1121 | want_cookie = false; /* not our kind of cookie */ |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1122 | tmp_ext.cookie_out_never = 0; /* false */ |
| 1123 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; |
| 1124 | } else if (!tp->rx_opt.cookie_in_always) { |
| 1125 | /* redundant indications, but ensure initialization. */ |
| 1126 | tmp_ext.cookie_out_never = 1; /* true */ |
| 1127 | tmp_ext.cookie_plus = 0; |
| 1128 | } else { |
| 1129 | goto drop_and_free; |
| 1130 | } |
| 1131 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | |
Florian Westphal | 4dfc281 | 2008-04-10 03:12:40 -0700 | [diff] [blame] | 1133 | if (want_cookie && !tmp_opt.saw_tstamp) |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1134 | tcp_clear_options(&tmp_opt); |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
| 1137 | tcp_openreq_init(req, &tmp_opt, skb); |
| 1138 | |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 1139 | treq = inet6_rsk(req); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1140 | treq->rmt_addr = ipv6_hdr(skb)->saddr; |
| 1141 | treq->loc_addr = ipv6_hdr(skb)->daddr; |
Florian Westphal | 172d69e | 2010-06-21 11:48:45 +0000 | [diff] [blame] | 1142 | if (!want_cookie || tmp_opt.tstamp_ok) |
Eric Dumazet | bd14b1b | 2012-05-04 05:14:02 +0000 | [diff] [blame] | 1143 | TCP_ECN_create_request(req, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
Eric Dumazet | 4d0fe50 | 2011-11-23 17:29:23 -0500 | [diff] [blame] | 1145 | treq->iif = sk->sk_bound_dev_if; |
| 1146 | |
| 1147 | /* So that link locals have meaning */ |
| 1148 | if (!sk->sk_bound_dev_if && |
| 1149 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
| 1150 | treq->iif = inet6_iif(skb); |
| 1151 | |
Florian Westphal | 2bbdf38 | 2010-06-13 11:29:39 +0000 | [diff] [blame] | 1152 | if (!isn) { |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1153 | struct inet_peer *peer = NULL; |
| 1154 | |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1155 | if (ipv6_opt_accepted(sk, skb) || |
| 1156 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
| 1157 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { |
| 1158 | atomic_inc(&skb->users); |
| 1159 | treq->pktopts = skb; |
| 1160 | } |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1161 | |
| 1162 | if (want_cookie) { |
Florian Westphal | 2bbdf38 | 2010-06-13 11:29:39 +0000 | [diff] [blame] | 1163 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
| 1164 | req->cookie_ts = tmp_opt.tstamp_ok; |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1165 | goto have_isn; |
Florian Westphal | 2bbdf38 | 2010-06-13 11:29:39 +0000 | [diff] [blame] | 1166 | } |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1167 | |
| 1168 | /* VJ's idea. We save last timestamp seen |
| 1169 | * from the destination in peer table, when entering |
| 1170 | * state TIME-WAIT, and check against it before |
| 1171 | * accepting new connection request. |
| 1172 | * |
| 1173 | * If "isn" is not zero, this request hit alive |
| 1174 | * timewait bucket, so that all the necessary checks |
| 1175 | * are made in the function processing timewait state. |
| 1176 | */ |
| 1177 | if (tmp_opt.saw_tstamp && |
| 1178 | tcp_death_row.sysctl_tw_recycle && |
| 1179 | (dst = inet6_csk_route_req(sk, req)) != NULL && |
| 1180 | (peer = rt6_get_peer((struct rt6_info *)dst)) != NULL && |
David S. Miller | 7a71ed8 | 2011-02-09 14:30:26 -0800 | [diff] [blame] | 1181 | ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6, |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1182 | &treq->rmt_addr)) { |
| 1183 | inet_peer_refcheck(peer); |
| 1184 | if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL && |
| 1185 | (s32)(peer->tcp_ts - req->ts_recent) > |
| 1186 | TCP_PAWS_WINDOW) { |
| 1187 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
| 1188 | goto drop_and_release; |
| 1189 | } |
| 1190 | } |
| 1191 | /* Kill the following clause, if you dislike this way. */ |
| 1192 | else if (!sysctl_tcp_syncookies && |
| 1193 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < |
| 1194 | (sysctl_max_syn_backlog >> 2)) && |
| 1195 | (!peer || !peer->tcp_ts_stamp) && |
| 1196 | (!dst || !dst_metric(dst, RTAX_RTT))) { |
| 1197 | /* Without syncookies last quarter of |
| 1198 | * backlog is filled with destinations, |
| 1199 | * proven to be alive. |
| 1200 | * It means that we continue to communicate |
| 1201 | * to destinations, already remembered |
| 1202 | * to the moment of synflood. |
| 1203 | */ |
| 1204 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", |
| 1205 | &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); |
| 1206 | goto drop_and_release; |
| 1207 | } |
| 1208 | |
| 1209 | isn = tcp_v6_init_sequence(skb); |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1210 | } |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1211 | have_isn: |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1212 | tcp_rsk(req)->snt_isn = isn; |
Jerry Chu | 9ad7c04 | 2011-06-08 11:08:38 +0000 | [diff] [blame] | 1213 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | |
Neal Cardwell | 437c5b5 | 2012-06-23 19:22:00 +0000 | [diff] [blame] | 1215 | if (security_inet_conn_request(sk, skb, req)) |
| 1216 | goto drop_and_release; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 1217 | |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1218 | if (tcp_v6_send_synack(sk, req, |
Eric Dumazet | fff3269 | 2012-06-01 01:47:50 +0000 | [diff] [blame] | 1219 | (struct request_values *)&tmp_ext, |
| 1220 | skb_get_queue_mapping(skb)) || |
William Allen Simpson | 4957faade | 2009-12-02 18:25:27 +0000 | [diff] [blame] | 1221 | want_cookie) |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1222 | goto drop_and_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1224 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
| 1225 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1227 | drop_and_release: |
| 1228 | dst_release(dst); |
William Allen Simpson | e6b4d11 | 2009-12-02 18:07:39 +0000 | [diff] [blame] | 1229 | drop_and_free: |
| 1230 | reqsk_free(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | drop: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | return 0; /* don't send reset */ |
| 1233 | } |
| 1234 | |
| 1235 | 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] | 1236 | struct request_sock *req, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | struct dst_entry *dst) |
| 1238 | { |
Vegard Nossum | 78d15e8 | 2008-09-12 16:17:43 -0700 | [diff] [blame] | 1239 | struct inet6_request_sock *treq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
| 1241 | struct tcp6_sock *newtcp6sk; |
| 1242 | struct inet_sock *newinet; |
| 1243 | struct tcp_sock *newtp; |
| 1244 | struct sock *newsk; |
| 1245 | struct ipv6_txoptions *opt; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1246 | #ifdef CONFIG_TCP_MD5SIG |
| 1247 | struct tcp_md5sig_key *key; |
| 1248 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | |
| 1250 | if (skb->protocol == htons(ETH_P_IP)) { |
| 1251 | /* |
| 1252 | * v6 mapped |
| 1253 | */ |
| 1254 | |
| 1255 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); |
| 1256 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1257 | if (newsk == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | return NULL; |
| 1259 | |
| 1260 | newtcp6sk = (struct tcp6_sock *)newsk; |
| 1261 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| 1262 | |
| 1263 | newinet = inet_sk(newsk); |
| 1264 | newnp = inet6_sk(newsk); |
| 1265 | newtp = tcp_sk(newsk); |
| 1266 | |
| 1267 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 1268 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1269 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1271 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1273 | newnp->rcv_saddr = newnp->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1275 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1277 | #ifdef CONFIG_TCP_MD5SIG |
| 1278 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; |
| 1279 | #endif |
| 1280 | |
Yan, Zheng | 676a118 | 2011-09-25 02:21:30 +0000 | [diff] [blame] | 1281 | newnp->ipv6_ac_list = NULL; |
| 1282 | newnp->ipv6_fl_list = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | newnp->pktoptions = NULL; |
| 1284 | newnp->opt = NULL; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1285 | newnp->mcast_oif = inet6_iif(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1286 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
Jiri Benc | 4c507d2 | 2012-02-09 09:35:49 +0000 | [diff] [blame] | 1287 | newnp->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1289 | /* |
| 1290 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count |
| 1291 | * here, tcp_create_openreq_child now does this for us, see the comment in |
| 1292 | * that function for the gory details. -acme |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | |
| 1295 | /* It is tricky place. Until this moment IPv4 tcp |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1296 | worked with IPv6 icsk.icsk_af_ops. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | Sync it now. |
| 1298 | */ |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1299 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | |
| 1301 | return newsk; |
| 1302 | } |
| 1303 | |
Vegard Nossum | 78d15e8 | 2008-09-12 16:17:43 -0700 | [diff] [blame] | 1304 | treq = inet6_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | opt = np->opt; |
| 1306 | |
| 1307 | if (sk_acceptq_is_full(sk)) |
| 1308 | goto out_overflow; |
| 1309 | |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1310 | if (!dst) { |
| 1311 | dst = inet6_csk_route_req(sk, req); |
| 1312 | if (!dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | goto out; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1314 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | |
| 1316 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1317 | if (newsk == NULL) |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1318 | goto out_nonewsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1320 | /* |
| 1321 | * No need to charge this sock to the relevant IPv6 refcnt debug socks |
| 1322 | * count here, tcp_create_openreq_child now does this for us, see the |
| 1323 | * comment in that function for the gory details. -acme |
| 1324 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | |
Stephen Hemminger | 59eed27 | 2006-08-25 15:55:43 -0700 | [diff] [blame] | 1326 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 1327 | __ip6_dst_store(newsk, dst, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | |
| 1329 | newtcp6sk = (struct tcp6_sock *)newsk; |
| 1330 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| 1331 | |
| 1332 | newtp = tcp_sk(newsk); |
| 1333 | newinet = inet_sk(newsk); |
| 1334 | newnp = inet6_sk(newsk); |
| 1335 | |
| 1336 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 1337 | |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1338 | newnp->daddr = treq->rmt_addr; |
| 1339 | newnp->saddr = treq->loc_addr; |
| 1340 | newnp->rcv_saddr = treq->loc_addr; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1341 | newsk->sk_bound_dev_if = treq->iif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1343 | /* Now IPv6 options... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | |
| 1345 | First: no IPv4 options. |
| 1346 | */ |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1347 | newinet->inet_opt = NULL; |
Yan, Zheng | 676a118 | 2011-09-25 02:21:30 +0000 | [diff] [blame] | 1348 | newnp->ipv6_ac_list = NULL; |
Masayuki Nakagawa | d35690b | 2007-03-16 16:14:03 -0700 | [diff] [blame] | 1349 | newnp->ipv6_fl_list = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | |
| 1351 | /* Clone RX bits */ |
| 1352 | newnp->rxopt.all = np->rxopt.all; |
| 1353 | |
| 1354 | /* Clone pktoptions received with SYN */ |
| 1355 | newnp->pktoptions = NULL; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1356 | if (treq->pktopts != NULL) { |
| 1357 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); |
Eric Dumazet | ab185d7 | 2012-04-19 02:24:36 +0000 | [diff] [blame] | 1358 | consume_skb(treq->pktopts); |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1359 | treq->pktopts = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | if (newnp->pktoptions) |
| 1361 | skb_set_owner_r(newnp->pktoptions, newsk); |
| 1362 | } |
| 1363 | newnp->opt = NULL; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1364 | newnp->mcast_oif = inet6_iif(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1365 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
Jiri Benc | 4c507d2 | 2012-02-09 09:35:49 +0000 | [diff] [blame] | 1366 | newnp->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | |
| 1368 | /* Clone native IPv6 options from listening socket (if any) |
| 1369 | |
| 1370 | Yes, keeping reference count would be much more clever, |
| 1371 | but we make one more one thing there: reattach optmem |
| 1372 | to newsk. |
| 1373 | */ |
| 1374 | if (opt) { |
| 1375 | newnp->opt = ipv6_dup_options(newsk, opt); |
| 1376 | if (opt != np->opt) |
| 1377 | sock_kfree_s(sk, opt, opt->tot_len); |
| 1378 | } |
| 1379 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1380 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | if (newnp->opt) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1382 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
| 1383 | newnp->opt->opt_flen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | |
John Heffner | 5d424d5 | 2006-03-20 17:53:41 -0800 | [diff] [blame] | 1385 | tcp_mtup_init(newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | tcp_sync_mss(newsk, dst_mtu(dst)); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1387 | newtp->advmss = dst_metric_advmss(dst); |
Neal Cardwell | d135c52 | 2012-04-22 09:45:47 +0000 | [diff] [blame] | 1388 | if (tcp_sk(sk)->rx_opt.user_mss && |
| 1389 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) |
| 1390 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; |
| 1391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | tcp_initialize_rcv_mss(newsk); |
Jerry Chu | 9ad7c04 | 2011-06-08 11:08:38 +0000 | [diff] [blame] | 1393 | if (tcp_rsk(req)->snt_synack) |
| 1394 | tcp_valid_rtt_meas(newsk, |
| 1395 | tcp_time_stamp - tcp_rsk(req)->snt_synack); |
| 1396 | newtp->total_retrans = req->retrans; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1398 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
| 1399 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1401 | #ifdef CONFIG_TCP_MD5SIG |
| 1402 | /* Copy over the MD5 key from the original socket */ |
| 1403 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { |
| 1404 | /* We're using one, so create a matching key |
| 1405 | * on the newsk structure. If we fail to get |
| 1406 | * memory, then we end up not copying the key |
| 1407 | * across. Shucks. |
| 1408 | */ |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 1409 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newnp->daddr, |
| 1410 | AF_INET6, key->key, key->keylen, GFP_ATOMIC); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1411 | } |
| 1412 | #endif |
| 1413 | |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1414 | if (__inet_inherit_port(sk, newsk) < 0) { |
| 1415 | sock_put(newsk); |
| 1416 | goto out; |
| 1417 | } |
Eric Dumazet | 9327f70 | 2009-12-04 03:46:54 +0000 | [diff] [blame] | 1418 | __inet6_hash(newsk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | |
| 1420 | return newsk; |
| 1421 | |
| 1422 | out_overflow: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1423 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1424 | out_nonewsk: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | if (opt && opt != np->opt) |
| 1426 | sock_kfree_s(sk, opt, opt->tot_len); |
| 1427 | dst_release(dst); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1428 | out: |
| 1429 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | return NULL; |
| 1431 | } |
| 1432 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 1433 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1435 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 1436 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1437 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1438 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | return 0; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1440 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | } |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1442 | |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 1443 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1444 | &ipv6_hdr(skb)->saddr, |
| 1445 | &ipv6_hdr(skb)->daddr, 0)); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | if (skb->len <= 76) { |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 1448 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | } |
| 1450 | return 0; |
| 1451 | } |
| 1452 | |
| 1453 | /* The socket must have it's spinlock held when we get |
| 1454 | * here. |
| 1455 | * |
| 1456 | * We have a potential double-lock case here, so even when |
| 1457 | * doing backlog processing we use the BH locking scheme. |
| 1458 | * This is because we cannot sleep with the original spinlock |
| 1459 | * held. |
| 1460 | */ |
| 1461 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1462 | { |
| 1463 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1464 | struct tcp_sock *tp; |
| 1465 | struct sk_buff *opt_skb = NULL; |
| 1466 | |
| 1467 | /* Imagine: socket is IPv6. IPv4 packet arrives, |
| 1468 | goes to IPv4 receive handler and backlogged. |
| 1469 | From backlog it always goes here. Kerboom... |
| 1470 | Fortunately, tcp_rcv_established and rcv_established |
| 1471 | handle them correctly, but it is not case with |
| 1472 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK |
| 1473 | */ |
| 1474 | |
| 1475 | if (skb->protocol == htons(ETH_P_IP)) |
| 1476 | return tcp_v4_do_rcv(sk, skb); |
| 1477 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1478 | #ifdef CONFIG_TCP_MD5SIG |
| 1479 | if (tcp_v6_inbound_md5_hash (sk, skb)) |
| 1480 | goto discard; |
| 1481 | #endif |
| 1482 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1483 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | goto discard; |
| 1485 | |
| 1486 | /* |
| 1487 | * socket locking is here for SMP purposes as backlog rcv |
| 1488 | * is currently called with bh processing disabled. |
| 1489 | */ |
| 1490 | |
| 1491 | /* Do Stevens' IPV6_PKTOPTIONS. |
| 1492 | |
| 1493 | Yes, guys, it is the only place in our code, where we |
| 1494 | may make it not affecting IPv4. |
| 1495 | The rest of code is protocol independent, |
| 1496 | and I do not like idea to uglify IPv4. |
| 1497 | |
| 1498 | Actually, all the idea behind IPV6_PKTOPTIONS |
| 1499 | looks not very well thought. For now we latch |
| 1500 | options, received in the last packet, enqueued |
| 1501 | by tcp. Feel free to propose better solution. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1502 | --ANK (980728) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | */ |
| 1504 | if (np->rxopt.all) |
| 1505 | opt_skb = skb_clone(skb, GFP_ATOMIC); |
| 1506 | |
| 1507 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1508 | sock_rps_save_rxhash(sk, skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1509 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | goto reset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | if (opt_skb) |
| 1512 | goto ipv6_pktoptions; |
| 1513 | return 0; |
| 1514 | } |
| 1515 | |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 1516 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | goto csum_err; |
| 1518 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1519 | if (sk->sk_state == TCP_LISTEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
| 1521 | if (!nsk) |
| 1522 | goto discard; |
| 1523 | |
| 1524 | /* |
| 1525 | * Queue it on the new socket if the new socket is active, |
| 1526 | * otherwise we just shortcircuit this and continue with |
| 1527 | * the new socket.. |
| 1528 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1529 | if(nsk != sk) { |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1530 | sock_rps_save_rxhash(nsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | if (tcp_child_process(sk, nsk, skb)) |
| 1532 | goto reset; |
| 1533 | if (opt_skb) |
| 1534 | __kfree_skb(opt_skb); |
| 1535 | return 0; |
| 1536 | } |
Neil Horman | 47482f1 | 2011-04-06 13:07:09 -0700 | [diff] [blame] | 1537 | } else |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1538 | sock_rps_save_rxhash(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1540 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | goto reset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | if (opt_skb) |
| 1543 | goto ipv6_pktoptions; |
| 1544 | return 0; |
| 1545 | |
| 1546 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1547 | tcp_v6_send_reset(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | discard: |
| 1549 | if (opt_skb) |
| 1550 | __kfree_skb(opt_skb); |
| 1551 | kfree_skb(skb); |
| 1552 | return 0; |
| 1553 | csum_err: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1554 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | goto discard; |
| 1556 | |
| 1557 | |
| 1558 | ipv6_pktoptions: |
| 1559 | /* Do you ask, what is it? |
| 1560 | |
| 1561 | 1. skb was enqueued by tcp. |
| 1562 | 2. skb is added to tail of read queue, rather than out of order. |
| 1563 | 3. socket is not in passive state. |
| 1564 | 4. Finally, it really contains options, which user wants to receive. |
| 1565 | */ |
| 1566 | tp = tcp_sk(sk); |
| 1567 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && |
| 1568 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1569 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1570 | np->mcast_oif = inet6_iif(opt_skb); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1571 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1572 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
Jiri Benc | 4c507d2 | 2012-02-09 09:35:49 +0000 | [diff] [blame] | 1573 | if (np->rxopt.bits.rxtclass) |
| 1574 | np->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | if (ipv6_opt_accepted(sk, opt_skb)) { |
| 1576 | skb_set_owner_r(opt_skb, sk); |
| 1577 | opt_skb = xchg(&np->pktoptions, opt_skb); |
| 1578 | } else { |
| 1579 | __kfree_skb(opt_skb); |
| 1580 | opt_skb = xchg(&np->pktoptions, NULL); |
| 1581 | } |
| 1582 | } |
| 1583 | |
Wei Yongjun | 800d55f | 2009-02-23 21:45:33 +0000 | [diff] [blame] | 1584 | kfree_skb(opt_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | return 0; |
| 1586 | } |
| 1587 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 1588 | static int tcp_v6_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1590 | const struct tcphdr *th; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 1591 | const struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | struct sock *sk; |
| 1593 | int ret; |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 1594 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | |
| 1596 | if (skb->pkt_type != PACKET_HOST) |
| 1597 | goto discard_it; |
| 1598 | |
| 1599 | /* |
| 1600 | * Count it even if it's bad. |
| 1601 | */ |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1602 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | |
| 1604 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1605 | goto discard_it; |
| 1606 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1607 | th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | |
| 1609 | if (th->doff < sizeof(struct tcphdr)/4) |
| 1610 | goto bad_packet; |
| 1611 | if (!pskb_may_pull(skb, th->doff*4)) |
| 1612 | goto discard_it; |
| 1613 | |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 1614 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | goto bad_packet; |
| 1616 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1617 | th = tcp_hdr(skb); |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 1618 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1620 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1621 | skb->len - th->doff*4); |
| 1622 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
| 1623 | TCP_SKB_CB(skb)->when = 0; |
Eric Dumazet | b82d1bb | 2011-09-27 02:20:08 -0400 | [diff] [blame] | 1624 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | TCP_SKB_CB(skb)->sacked = 0; |
| 1626 | |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 1627 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | if (!sk) |
| 1629 | goto no_tcp_socket; |
| 1630 | |
| 1631 | process: |
| 1632 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1633 | goto do_time_wait; |
| 1634 | |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 1635 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
| 1636 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
| 1637 | goto discard_and_relse; |
| 1638 | } |
| 1639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1641 | goto discard_and_relse; |
| 1642 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1643 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | goto discard_and_relse; |
| 1645 | |
| 1646 | skb->dev = NULL; |
| 1647 | |
Fabio Olive Leite | 293b9c4 | 2006-09-25 22:28:47 -0700 | [diff] [blame] | 1648 | bh_lock_sock_nested(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | ret = 0; |
| 1650 | if (!sock_owned_by_user(sk)) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1651 | #ifdef CONFIG_NET_DMA |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1652 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | b4caea8 | 2007-10-26 04:20:13 -0700 | [diff] [blame] | 1653 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
Dave Jiang | a2bd114 | 2012-04-04 16:10:46 -0700 | [diff] [blame] | 1654 | tp->ucopy.dma_chan = net_dma_find_channel(); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1655 | if (tp->ucopy.dma_chan) |
| 1656 | ret = tcp_v6_do_rcv(sk, skb); |
| 1657 | else |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1658 | #endif |
| 1659 | { |
| 1660 | if (!tcp_prequeue(sk, skb)) |
| 1661 | ret = tcp_v6_do_rcv(sk, skb); |
| 1662 | } |
Eric Dumazet | da882c1 | 2012-04-22 23:38:54 +0000 | [diff] [blame] | 1663 | } else if (unlikely(sk_add_backlog(sk, skb, |
| 1664 | sk->sk_rcvbuf + sk->sk_sndbuf))) { |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1665 | bh_unlock_sock(sk); |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1666 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1667 | goto discard_and_relse; |
| 1668 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | bh_unlock_sock(sk); |
| 1670 | |
| 1671 | sock_put(sk); |
| 1672 | return ret ? -1 : 0; |
| 1673 | |
| 1674 | no_tcp_socket: |
| 1675 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1676 | goto discard_it; |
| 1677 | |
| 1678 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
| 1679 | bad_packet: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1680 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1682 | tcp_v6_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | } |
| 1684 | |
| 1685 | discard_it: |
| 1686 | |
| 1687 | /* |
| 1688 | * Discard frame |
| 1689 | */ |
| 1690 | |
| 1691 | kfree_skb(skb); |
| 1692 | return 0; |
| 1693 | |
| 1694 | discard_and_relse: |
| 1695 | sock_put(sk); |
| 1696 | goto discard_it; |
| 1697 | |
| 1698 | do_time_wait: |
| 1699 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1700 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | goto discard_it; |
| 1702 | } |
| 1703 | |
| 1704 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1705 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1706 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | goto discard_it; |
| 1708 | } |
| 1709 | |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1710 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | case TCP_TW_SYN: |
| 1712 | { |
| 1713 | struct sock *sk2; |
| 1714 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1715 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1716 | &ipv6_hdr(skb)->daddr, |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 1717 | ntohs(th->dest), inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | if (sk2 != NULL) { |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 1719 | struct inet_timewait_sock *tw = inet_twsk(sk); |
| 1720 | inet_twsk_deschedule(tw, &tcp_death_row); |
| 1721 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | sk = sk2; |
| 1723 | goto process; |
| 1724 | } |
| 1725 | /* Fall through to ACK */ |
| 1726 | } |
| 1727 | case TCP_TW_ACK: |
| 1728 | tcp_v6_timewait_ack(sk, skb); |
| 1729 | break; |
| 1730 | case TCP_TW_RST: |
| 1731 | goto no_tcp_socket; |
| 1732 | case TCP_TW_SUCCESS:; |
| 1733 | } |
| 1734 | goto discard_it; |
| 1735 | } |
| 1736 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1737 | 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] | 1738 | { |
David S. Miller | db3949c | 2010-12-02 11:52:07 -0800 | [diff] [blame] | 1739 | struct rt6_info *rt = (struct rt6_info *) __sk_dst_get(sk); |
| 1740 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1741 | struct inet_peer *peer; |
| 1742 | |
| 1743 | if (!rt || |
| 1744 | !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr)) { |
| 1745 | peer = inet_getpeer_v6(&np->daddr, 1); |
| 1746 | *release_it = true; |
| 1747 | } else { |
| 1748 | if (!rt->rt6i_peer) |
| 1749 | rt6_bind_peer(rt, 1); |
| 1750 | peer = rt->rt6i_peer; |
David S. Miller | 457de43 | 2010-12-10 13:16:09 -0800 | [diff] [blame] | 1751 | *release_it = false; |
David S. Miller | db3949c | 2010-12-02 11:52:07 -0800 | [diff] [blame] | 1752 | } |
| 1753 | |
| 1754 | return peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | } |
| 1756 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1757 | static void *tcp_v6_tw_get_peer(struct sock *sk) |
| 1758 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1759 | const struct inet6_timewait_sock *tw6 = inet6_twsk(sk); |
| 1760 | const struct inet_timewait_sock *tw = inet_twsk(sk); |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1761 | |
| 1762 | if (tw->tw_family == AF_INET) |
| 1763 | return tcp_v4_tw_get_peer(sk); |
| 1764 | |
David S. Miller | db3949c | 2010-12-02 11:52:07 -0800 | [diff] [blame] | 1765 | return inet_getpeer_v6(&tw6->tw_v6_daddr, 1); |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1766 | } |
| 1767 | |
| 1768 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
| 1769 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
| 1770 | .twsk_unique = tcp_twsk_unique, |
| 1771 | .twsk_destructor= tcp_twsk_destructor, |
| 1772 | .twsk_getpeer = tcp_v6_tw_get_peer, |
| 1773 | }; |
| 1774 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 1775 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1776 | .queue_xmit = inet6_csk_xmit, |
| 1777 | .send_check = tcp_v6_send_check, |
| 1778 | .rebuild_header = inet6_sk_rebuild_header, |
| 1779 | .conn_request = tcp_v6_conn_request, |
| 1780 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1781 | .get_peer = tcp_v6_get_peer, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1782 | .net_header_len = sizeof(struct ipv6hdr), |
Eric Dumazet | 6746960 | 2012-04-24 07:37:38 +0000 | [diff] [blame] | 1783 | .net_frag_header_len = sizeof(struct frag_hdr), |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1784 | .setsockopt = ipv6_setsockopt, |
| 1785 | .getsockopt = ipv6_getsockopt, |
| 1786 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
| 1787 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1788 | .bind_conflict = inet6_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1789 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1790 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 1791 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1792 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | }; |
| 1794 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1795 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1796 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1797 | .md5_lookup = tcp_v6_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1798 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1799 | .md5_parse = tcp_v6_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1800 | }; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 1801 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1802 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | /* |
| 1804 | * TCP over IPv4 via INET6 API |
| 1805 | */ |
| 1806 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 1807 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1808 | .queue_xmit = ip_queue_xmit, |
| 1809 | .send_check = tcp_v4_send_check, |
| 1810 | .rebuild_header = inet_sk_rebuild_header, |
| 1811 | .conn_request = tcp_v6_conn_request, |
| 1812 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
David S. Miller | 3f419d2 | 2010-11-29 13:37:14 -0800 | [diff] [blame] | 1813 | .get_peer = tcp_v4_get_peer, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1814 | .net_header_len = sizeof(struct iphdr), |
| 1815 | .setsockopt = ipv6_setsockopt, |
| 1816 | .getsockopt = ipv6_getsockopt, |
| 1817 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
| 1818 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1819 | .bind_conflict = inet6_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1820 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1821 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 1822 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1823 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | }; |
| 1825 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1826 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1827 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1828 | .md5_lookup = tcp_v4_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1829 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1830 | .md5_parse = tcp_v6_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1831 | }; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 1832 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | /* NOTE: A lot of things set to zero explicitly by call to |
| 1835 | * sk_alloc() so need not be done here. |
| 1836 | */ |
| 1837 | static int tcp_v6_init_sock(struct sock *sk) |
| 1838 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1839 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 1841 | tcp_init_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1843 | icsk->icsk_af_ops = &ipv6_specific; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1845 | #ifdef CONFIG_TCP_MD5SIG |
David S. Miller | ac807fa | 2012-04-23 03:21:58 -0400 | [diff] [blame] | 1846 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1847 | #endif |
| 1848 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | return 0; |
| 1850 | } |
| 1851 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1852 | static void tcp_v6_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | tcp_v4_destroy_sock(sk); |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1855 | inet6_destroy_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | } |
| 1857 | |
YOSHIFUJI Hideaki | 952a10b | 2007-04-21 20:13:44 +0900 | [diff] [blame] | 1858 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | /* Proc filesystem TCPv6 sock list dumping. */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1860 | static void get_openreq6(struct seq_file *seq, |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1861 | const struct sock *sk, struct request_sock *req, int i, int uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | int ttd = req->expires - jiffies; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 1864 | const struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
| 1865 | const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | |
| 1867 | if (ttd < 0) |
| 1868 | ttd = 0; |
| 1869 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | seq_printf(seq, |
| 1871 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 1872 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | i, |
| 1874 | src->s6_addr32[0], src->s6_addr32[1], |
| 1875 | src->s6_addr32[2], src->s6_addr32[3], |
KOVACS Krisztian | fd50703 | 2008-10-19 23:35:58 -0700 | [diff] [blame] | 1876 | ntohs(inet_rsk(req)->loc_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1878 | dest->s6_addr32[2], dest->s6_addr32[3], |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1879 | ntohs(inet_rsk(req)->rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | TCP_SYN_RECV, |
| 1881 | 0,0, /* could print option size, but that is af dependent. */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1882 | 1, /* timers active (only the expire timer) */ |
| 1883 | jiffies_to_clock_t(ttd), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | req->retrans, |
| 1885 | uid, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1886 | 0, /* non standard timer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | 0, /* open_requests have no inode */ |
| 1888 | 0, req); |
| 1889 | } |
| 1890 | |
| 1891 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) |
| 1892 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 1893 | const struct in6_addr *dest, *src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | __u16 destp, srcp; |
| 1895 | int timer_active; |
| 1896 | unsigned long timer_expires; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1897 | const struct inet_sock *inet = inet_sk(sp); |
| 1898 | const struct tcp_sock *tp = tcp_sk(sp); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1899 | const struct inet_connection_sock *icsk = inet_csk(sp); |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1900 | const struct ipv6_pinfo *np = inet6_sk(sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | |
| 1902 | dest = &np->daddr; |
| 1903 | src = &np->rcv_saddr; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1904 | destp = ntohs(inet->inet_dport); |
| 1905 | srcp = ntohs(inet->inet_sport); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1906 | |
| 1907 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1909 | timer_expires = icsk->icsk_timeout; |
| 1910 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1912 | timer_expires = icsk->icsk_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | } else if (timer_pending(&sp->sk_timer)) { |
| 1914 | timer_active = 2; |
| 1915 | timer_expires = sp->sk_timer.expires; |
| 1916 | } else { |
| 1917 | timer_active = 0; |
| 1918 | timer_expires = jiffies; |
| 1919 | } |
| 1920 | |
| 1921 | seq_printf(seq, |
| 1922 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 1923 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | i, |
| 1925 | src->s6_addr32[0], src->s6_addr32[1], |
| 1926 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 1927 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1928 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1929 | sp->sk_state, |
Sridhar Samudrala | 47da8ee | 2006-06-27 13:29:00 -0700 | [diff] [blame] | 1930 | tp->write_seq-tp->snd_una, |
| 1931 | (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] | 1932 | timer_active, |
| 1933 | jiffies_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1934 | icsk->icsk_retransmits, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | sock_i_uid(sp), |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1936 | icsk->icsk_probes_out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | sock_i_ino(sp), |
| 1938 | atomic_read(&sp->sk_refcnt), sp, |
Stephen Hemminger | 7be8735 | 2008-06-27 20:00:19 -0700 | [diff] [blame] | 1939 | jiffies_to_clock_t(icsk->icsk_rto), |
| 1940 | jiffies_to_clock_t(icsk->icsk_ack.ato), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1941 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
Ilpo Järvinen | 0b6a05c | 2009-09-15 01:30:10 -0700 | [diff] [blame] | 1942 | tp->snd_cwnd, |
| 1943 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1944 | ); |
| 1945 | } |
| 1946 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1947 | static void get_timewait6_sock(struct seq_file *seq, |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1948 | struct inet_timewait_sock *tw, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 1950 | const struct in6_addr *dest, *src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | __u16 destp, srcp; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1952 | const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | int ttd = tw->tw_ttd - jiffies; |
| 1954 | |
| 1955 | if (ttd < 0) |
| 1956 | ttd = 0; |
| 1957 | |
Arnaldo Carvalho de Melo | 0fa1a53 | 2005-12-13 23:23:09 -0800 | [diff] [blame] | 1958 | dest = &tw6->tw_v6_daddr; |
| 1959 | src = &tw6->tw_v6_rcv_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | destp = ntohs(tw->tw_dport); |
| 1961 | srcp = ntohs(tw->tw_sport); |
| 1962 | |
| 1963 | seq_printf(seq, |
| 1964 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 1965 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | i, |
| 1967 | src->s6_addr32[0], src->s6_addr32[1], |
| 1968 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 1969 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1970 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
| 1971 | tw->tw_substate, 0, 0, |
| 1972 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, |
| 1973 | atomic_read(&tw->tw_refcnt), tw); |
| 1974 | } |
| 1975 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
| 1977 | { |
| 1978 | struct tcp_iter_state *st; |
| 1979 | |
| 1980 | if (v == SEQ_START_TOKEN) { |
| 1981 | seq_puts(seq, |
| 1982 | " sl " |
| 1983 | "local_address " |
| 1984 | "remote_address " |
| 1985 | "st tx_queue rx_queue tr tm->when retrnsmt" |
| 1986 | " uid timeout inode\n"); |
| 1987 | goto out; |
| 1988 | } |
| 1989 | st = seq->private; |
| 1990 | |
| 1991 | switch (st->state) { |
| 1992 | case TCP_SEQ_STATE_LISTENING: |
| 1993 | case TCP_SEQ_STATE_ESTABLISHED: |
| 1994 | get_tcp6_sock(seq, v, st->num); |
| 1995 | break; |
| 1996 | case TCP_SEQ_STATE_OPENREQ: |
| 1997 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); |
| 1998 | break; |
| 1999 | case TCP_SEQ_STATE_TIME_WAIT: |
| 2000 | get_timewait6_sock(seq, v, st->num); |
| 2001 | break; |
| 2002 | } |
| 2003 | out: |
| 2004 | return 0; |
| 2005 | } |
| 2006 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2007 | static const struct file_operations tcp6_afinfo_seq_fops = { |
| 2008 | .owner = THIS_MODULE, |
| 2009 | .open = tcp_seq_open, |
| 2010 | .read = seq_read, |
| 2011 | .llseek = seq_lseek, |
| 2012 | .release = seq_release_net |
| 2013 | }; |
| 2014 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | .name = "tcp6", |
| 2017 | .family = AF_INET6, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 2018 | .seq_fops = &tcp6_afinfo_seq_fops, |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 2019 | .seq_ops = { |
| 2020 | .show = tcp6_seq_show, |
| 2021 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | }; |
| 2023 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2024 | int __net_init tcp6_proc_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | { |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2026 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | } |
| 2028 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2029 | void tcp6_proc_exit(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | { |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 2031 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | } |
| 2033 | #endif |
| 2034 | |
| 2035 | struct proto tcpv6_prot = { |
| 2036 | .name = "TCPv6", |
| 2037 | .owner = THIS_MODULE, |
| 2038 | .close = tcp_close, |
| 2039 | .connect = tcp_v6_connect, |
| 2040 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2041 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2042 | .ioctl = tcp_ioctl, |
| 2043 | .init = tcp_v6_init_sock, |
| 2044 | .destroy = tcp_v6_destroy_sock, |
| 2045 | .shutdown = tcp_shutdown, |
| 2046 | .setsockopt = tcp_setsockopt, |
| 2047 | .getsockopt = tcp_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | .recvmsg = tcp_recvmsg, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2049 | .sendmsg = tcp_sendmsg, |
| 2050 | .sendpage = tcp_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | .backlog_rcv = tcp_v6_do_rcv, |
| 2052 | .hash = tcp_v6_hash, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 2053 | .unhash = inet_unhash, |
| 2054 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | .enter_memory_pressure = tcp_enter_memory_pressure, |
| 2056 | .sockets_allocated = &tcp_sockets_allocated, |
| 2057 | .memory_allocated = &tcp_memory_allocated, |
| 2058 | .memory_pressure = &tcp_memory_pressure, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2059 | .orphan_count = &tcp_orphan_count, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | .sysctl_wmem = sysctl_tcp_wmem, |
| 2061 | .sysctl_rmem = sysctl_tcp_rmem, |
| 2062 | .max_header = MAX_TCP_HEADER, |
| 2063 | .obj_size = sizeof(struct tcp6_sock), |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2064 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 2065 | .twsk_prot = &tcp6_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 2066 | .rsk_prot = &tcp6_request_sock_ops, |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 2067 | .h.hashinfo = &tcp_hashinfo, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 2068 | .no_autobind = true, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2069 | #ifdef CONFIG_COMPAT |
| 2070 | .compat_setsockopt = compat_tcp_setsockopt, |
| 2071 | .compat_getsockopt = compat_tcp_getsockopt, |
| 2072 | #endif |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 2073 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM |
| 2074 | .proto_cgroup = tcp_proto_cgroup, |
| 2075 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | }; |
| 2077 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 2078 | static const struct inet6_protocol tcpv6_protocol = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2079 | .handler = tcp_v6_rcv, |
| 2080 | .err_handler = tcp_v6_err, |
Herbert Xu | a430a43 | 2006-07-08 13:34:56 -0700 | [diff] [blame] | 2081 | .gso_send_check = tcp_v6_gso_send_check, |
Herbert Xu | adcfc7d | 2006-06-30 13:36:15 -0700 | [diff] [blame] | 2082 | .gso_segment = tcp_tso_segment, |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 2083 | .gro_receive = tcp6_gro_receive, |
| 2084 | .gro_complete = tcp6_gro_complete, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| 2086 | }; |
| 2087 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | static struct inet_protosw tcpv6_protosw = { |
| 2089 | .type = SOCK_STREAM, |
| 2090 | .protocol = IPPROTO_TCP, |
| 2091 | .prot = &tcpv6_prot, |
| 2092 | .ops = &inet6_stream_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | .no_check = 0, |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 2094 | .flags = INET_PROTOSW_PERMANENT | |
| 2095 | INET_PROTOSW_ICSK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | }; |
| 2097 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2098 | static int __net_init tcpv6_net_init(struct net *net) |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2099 | { |
Denis V. Lunev | 5677242 | 2008-04-03 14:28:30 -0700 | [diff] [blame] | 2100 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
| 2101 | SOCK_RAW, IPPROTO_TCP, net); |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2102 | } |
| 2103 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2104 | static void __net_exit tcpv6_net_exit(struct net *net) |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2105 | { |
Denis V. Lunev | 5677242 | 2008-04-03 14:28:30 -0700 | [diff] [blame] | 2106 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2107 | } |
| 2108 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2109 | 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] | 2110 | { |
| 2111 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2112 | } |
| 2113 | |
| 2114 | static struct pernet_operations tcpv6_net_ops = { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 2115 | .init = tcpv6_net_init, |
| 2116 | .exit = tcpv6_net_exit, |
| 2117 | .exit_batch = tcpv6_net_exit_batch, |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2118 | }; |
| 2119 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2120 | int __init tcpv6_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | { |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2122 | int ret; |
David Woodhouse | ae0f7d5 | 2006-01-11 15:53:04 -0800 | [diff] [blame] | 2123 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2124 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
| 2125 | if (ret) |
| 2126 | goto out; |
| 2127 | |
| 2128 | /* register inet6 protocol */ |
| 2129 | ret = inet6_register_protosw(&tcpv6_protosw); |
| 2130 | if (ret) |
| 2131 | goto out_tcpv6_protocol; |
| 2132 | |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2133 | ret = register_pernet_subsys(&tcpv6_net_ops); |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2134 | if (ret) |
| 2135 | goto out_tcpv6_protosw; |
| 2136 | out: |
| 2137 | return ret; |
| 2138 | |
| 2139 | out_tcpv6_protocol: |
| 2140 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
| 2141 | out_tcpv6_protosw: |
| 2142 | inet6_unregister_protosw(&tcpv6_protosw); |
| 2143 | goto out; |
| 2144 | } |
| 2145 | |
Daniel Lezcano | 09f7709 | 2007-12-13 05:34:58 -0800 | [diff] [blame] | 2146 | void tcpv6_exit(void) |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2147 | { |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 2148 | unregister_pernet_subsys(&tcpv6_net_ops); |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 2149 | inet6_unregister_protosw(&tcpv6_protosw); |
| 2150 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | } |