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> |
Wang Yufen | 4aa956d | 2014-03-29 09:27:29 +0800 | [diff] [blame] | 42 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Denis V. Lunev | 3d58b5f | 2008-04-03 14:22:32 -0700 | [diff] [blame] | 62 | #include <net/inet_common.h> |
David S. Miller | 6e5714e | 2011-08-03 20:50:44 -0700 | [diff] [blame] | 63 | #include <net/secure_seq.h> |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 64 | #include <net/tcp_memcontrol.h> |
Eliezer Tamir | 076bb0c | 2013-07-10 17:13:17 +0300 | [diff] [blame] | 65 | #include <net/busy_poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <linux/proc_fs.h> |
| 68 | #include <linux/seq_file.h> |
| 69 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 70 | #include <linux/crypto.h> |
| 71 | #include <linux/scatterlist.h> |
| 72 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 73 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 74 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
| 75 | struct request_sock *req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 79 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
| 80 | static const struct inet_connection_sock_af_ops ipv6_specific; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 81 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 82 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
| 83 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 84 | #else |
| 85 | 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] | 86 | const struct in6_addr *addr) |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 87 | { |
| 88 | return NULL; |
| 89 | } |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 90 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Neal Cardwell | fae6ef8 | 2012-08-19 03:30:38 +0000 | [diff] [blame] | 92 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
| 93 | { |
| 94 | struct dst_entry *dst = skb_dst(skb); |
Neal Cardwell | fae6ef8 | 2012-08-19 03:30:38 +0000 | [diff] [blame] | 95 | |
Eric Dumazet | ca777ef | 2014-09-08 08:06:07 -0700 | [diff] [blame] | 96 | if (dst) { |
| 97 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
| 98 | |
| 99 | dst_hold(dst); |
| 100 | sk->sk_rx_dst = dst; |
| 101 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; |
| 102 | if (rt->rt6i_node) |
| 103 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; |
| 104 | } |
Neal Cardwell | fae6ef8 | 2012-08-19 03:30:38 +0000 | [diff] [blame] | 105 | } |
| 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | static void tcp_v6_hash(struct sock *sk) |
| 108 | { |
| 109 | if (sk->sk_state != TCP_CLOSE) { |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 110 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | tcp_prot.hash(sk); |
| 112 | return; |
| 113 | } |
| 114 | local_bh_disable(); |
Eric Dumazet | 9327f70 | 2009-12-04 03:46:54 +0000 | [diff] [blame] | 115 | __inet6_hash(sk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | local_bh_enable(); |
| 117 | } |
| 118 | } |
| 119 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 120 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 122 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
| 123 | ipv6_hdr(skb)->saddr.s6_addr32, |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 124 | tcp_hdr(skb)->dest, |
| 125 | tcp_hdr(skb)->source); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } |
| 127 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 128 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | int addr_len) |
| 130 | { |
| 131 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 132 | struct inet_sock *inet = inet_sk(sk); |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 133 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 135 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 136 | struct in6_addr *saddr = NULL, *final_p, final; |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 137 | struct rt6_info *rt; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 138 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | struct dst_entry *dst; |
| 140 | int addr_type; |
| 141 | int err; |
| 142 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 143 | if (addr_len < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | return -EINVAL; |
| 145 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 146 | if (usin->sin6_family != AF_INET6) |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 147 | return -EAFNOSUPPORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 149 | memset(&fl6, 0, sizeof(fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
| 151 | if (np->sndflow) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 152 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| 153 | IP6_ECN_flow_init(fl6.flowlabel); |
| 154 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | struct ip6_flowlabel *flowlabel; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 156 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | if (flowlabel == NULL) |
| 158 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | fl6_sock_release(flowlabel); |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 164 | * connect() to INADDR_ANY means loopback (BSD'ism). |
| 165 | */ |
| 166 | |
Weilong Chen | 4c99aa4 | 2013-12-19 18:44:34 +0800 | [diff] [blame] | 167 | if (ipv6_addr_any(&usin->sin6_addr)) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 168 | usin->sin6_addr.s6_addr[15] = 0x1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | addr_type = ipv6_addr_type(&usin->sin6_addr); |
| 171 | |
Weilong Chen | 4c99aa4 | 2013-12-19 18:44:34 +0800 | [diff] [blame] | 172 | if (addr_type & IPV6_ADDR_MULTICAST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | return -ENETUNREACH; |
| 174 | |
| 175 | if (addr_type&IPV6_ADDR_LINKLOCAL) { |
| 176 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 177 | usin->sin6_scope_id) { |
| 178 | /* If interface is set while binding, indices |
| 179 | * must coincide. |
| 180 | */ |
| 181 | if (sk->sk_bound_dev_if && |
| 182 | sk->sk_bound_dev_if != usin->sin6_scope_id) |
| 183 | return -EINVAL; |
| 184 | |
| 185 | sk->sk_bound_dev_if = usin->sin6_scope_id; |
| 186 | } |
| 187 | |
| 188 | /* Connect to link-local address requires an interface */ |
| 189 | if (!sk->sk_bound_dev_if) |
| 190 | return -EINVAL; |
| 191 | } |
| 192 | |
| 193 | if (tp->rx_opt.ts_recent_stamp && |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 194 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | tp->rx_opt.ts_recent = 0; |
| 196 | tp->rx_opt.ts_recent_stamp = 0; |
| 197 | tp->write_seq = 0; |
| 198 | } |
| 199 | |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 200 | sk->sk_v6_daddr = usin->sin6_addr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 201 | np->flow_label = fl6.flowlabel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
Tom Herbert | b73c3d0 | 2014-07-01 21:32:17 -0700 | [diff] [blame] | 203 | ip6_set_txhash(sk); |
| 204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | /* |
| 206 | * TCP over IPv4 |
| 207 | */ |
| 208 | |
| 209 | if (addr_type == IPV6_ADDR_MAPPED) { |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 210 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | struct sockaddr_in sin; |
| 212 | |
| 213 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); |
| 214 | |
| 215 | if (__ipv6_only_sock(sk)) |
| 216 | return -ENETUNREACH; |
| 217 | |
| 218 | sin.sin_family = AF_INET; |
| 219 | sin.sin_port = usin->sin6_port; |
| 220 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
| 221 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 222 | icsk->icsk_af_ops = &ipv6_mapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 224 | #ifdef CONFIG_TCP_MD5SIG |
| 225 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; |
| 226 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
| 228 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); |
| 229 | |
| 230 | if (err) { |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 231 | icsk->icsk_ext_hdr_len = exthdrlen; |
| 232 | icsk->icsk_af_ops = &ipv6_specific; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 234 | #ifdef CONFIG_TCP_MD5SIG |
| 235 | tp->af_specific = &tcp_sock_ipv6_specific; |
| 236 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | goto failure; |
| 238 | } else { |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 239 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
| 240 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 241 | &sk->sk_v6_rcv_saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | return err; |
| 245 | } |
| 246 | |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 247 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
| 248 | saddr = &sk->sk_v6_rcv_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 250 | fl6.flowi6_proto = IPPROTO_TCP; |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 251 | fl6.daddr = sk->sk_v6_daddr; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 252 | fl6.saddr = saddr ? *saddr : np->saddr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 253 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
| 254 | fl6.flowi6_mark = sk->sk_mark; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 255 | fl6.fl6_dport = usin->sin6_port; |
| 256 | fl6.fl6_sport = inet->inet_sport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 258 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 260 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 261 | |
Steffen Klassert | 0e0d44a | 2013-08-28 08:04:14 +0200 | [diff] [blame] | 262 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 263 | if (IS_ERR(dst)) { |
| 264 | err = PTR_ERR(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | goto failure; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 266 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
| 268 | if (saddr == NULL) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 269 | saddr = &fl6.saddr; |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 270 | sk->sk_v6_rcv_saddr = *saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | /* set the source address */ |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 274 | np->saddr = *saddr; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 275 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
Herbert Xu | f83ef8c | 2006-06-30 13:37:03 -0700 | [diff] [blame] | 277 | sk->sk_gso_type = SKB_GSO_TCPV6; |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 278 | __ip6_dst_store(sk, dst, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 280 | rt = (struct rt6_info *) dst; |
| 281 | if (tcp_death_row.sysctl_tw_recycle && |
| 282 | !tp->rx_opt.ts_recent_stamp && |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 283 | ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr)) |
David S. Miller | 81166dd | 2012-07-10 03:14:24 -0700 | [diff] [blame] | 284 | tcp_fetch_timewait_stamp(sk, dst); |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 285 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 286 | icsk->icsk_ext_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | if (np->opt) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 288 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
| 289 | np->opt->opt_nflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
| 291 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| 292 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 293 | inet->inet_dport = usin->sin6_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
| 295 | tcp_set_state(sk, TCP_SYN_SENT); |
Arnaldo Carvalho de Melo | d8313f5 | 2005-12-13 23:25:44 -0800 | [diff] [blame] | 296 | err = inet6_hash_connect(&tcp_death_row, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | if (err) |
| 298 | goto late_failure; |
| 299 | |
Andrey Vagin | 2b91647 | 2012-11-22 01:13:58 +0000 | [diff] [blame] | 300 | if (!tp->write_seq && likely(!tp->repair)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 302 | sk->sk_v6_daddr.s6_addr32, |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 303 | inet->inet_sport, |
| 304 | inet->inet_dport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | err = tcp_connect(sk); |
| 307 | if (err) |
| 308 | goto late_failure; |
| 309 | |
| 310 | return 0; |
| 311 | |
| 312 | late_failure: |
| 313 | tcp_set_state(sk, TCP_CLOSE); |
| 314 | __sk_dst_reset(sk); |
| 315 | failure: |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 316 | inet->inet_dport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | sk->sk_route_caps = 0; |
| 318 | return err; |
| 319 | } |
| 320 | |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 321 | static void tcp_v6_mtu_reduced(struct sock *sk) |
| 322 | { |
| 323 | struct dst_entry *dst; |
| 324 | |
| 325 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) |
| 326 | return; |
| 327 | |
| 328 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); |
| 329 | if (!dst) |
| 330 | return; |
| 331 | |
| 332 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
| 333 | tcp_sync_mss(sk, dst_mtu(dst)); |
| 334 | tcp_simple_retransmit(sk); |
| 335 | } |
| 336 | } |
| 337 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | 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] | 339 | u8 type, u8 code, int offset, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | { |
Weilong Chen | 4c99aa4 | 2013-12-19 18:44:34 +0800 | [diff] [blame] | 341 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
Arnaldo Carvalho de Melo | 505cbfc | 2005-08-12 09:19:38 -0300 | [diff] [blame] | 342 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | struct ipv6_pinfo *np; |
| 344 | struct sock *sk; |
| 345 | int err; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 346 | struct tcp_sock *tp; |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 347 | struct request_sock *fastopen; |
| 348 | __u32 seq, snd_una; |
Pavel Emelyanov | ca12a1a | 2008-07-16 20:28:42 -0700 | [diff] [blame] | 349 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
Pavel Emelyanov | ca12a1a | 2008-07-16 20:28:42 -0700 | [diff] [blame] | 351 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
Pavel Emelyanov | d86e0da | 2008-01-31 05:07:21 -0800 | [diff] [blame] | 352 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | if (sk == NULL) { |
Denis V. Lunev | e41b536 | 2008-10-08 10:33:26 -0700 | [diff] [blame] | 355 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
| 356 | ICMP6_MIB_INERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | return; |
| 358 | } |
| 359 | |
| 360 | if (sk->sk_state == TCP_TIME_WAIT) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 361 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | return; |
| 363 | } |
| 364 | |
| 365 | bh_lock_sock(sk); |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 366 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 367 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | if (sk->sk_state == TCP_CLOSE) |
| 370 | goto out; |
| 371 | |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 372 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
| 373 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
| 374 | goto out; |
| 375 | } |
| 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | tp = tcp_sk(sk); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 378 | seq = ntohl(th->seq); |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 379 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
| 380 | fastopen = tp->fastopen_rsk; |
| 381 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | if (sk->sk_state != TCP_LISTEN && |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 383 | !between(seq, snd_una, tp->snd_nxt)) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 384 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | goto out; |
| 386 | } |
| 387 | |
| 388 | np = inet6_sk(sk); |
| 389 | |
David S. Miller | ec18d9a | 2012-07-12 00:25:15 -0700 | [diff] [blame] | 390 | if (type == NDISC_REDIRECT) { |
| 391 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); |
| 392 | |
David S. Miller | 1ed5c48 | 2012-07-12 00:41:25 -0700 | [diff] [blame] | 393 | if (dst) |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 394 | dst->ops->redirect(dst, sk, skb); |
Christoph Paasch | 50a75a8 | 2013-04-07 04:53:15 +0000 | [diff] [blame] | 395 | goto out; |
David S. Miller | ec18d9a | 2012-07-12 00:25:15 -0700 | [diff] [blame] | 396 | } |
| 397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (type == ICMPV6_PKT_TOOBIG) { |
Eric Dumazet | 0d4f060 | 2013-03-18 07:01:28 +0000 | [diff] [blame] | 399 | /* We are not interested in TCP_LISTEN and open_requests |
| 400 | * (SYN-ACKs send out by Linux are always <576bytes so |
| 401 | * they should go through unfragmented). |
| 402 | */ |
| 403 | if (sk->sk_state == TCP_LISTEN) |
| 404 | goto out; |
| 405 | |
Hannes Frederic Sowa | 93b36cf | 2013-12-15 03:41:14 +0100 | [diff] [blame] | 406 | if (!ip6_sk_accept_pmtu(sk)) |
| 407 | goto out; |
| 408 | |
Eric Dumazet | 563d34d | 2012-07-23 09:48:52 +0200 | [diff] [blame] | 409 | tp->mtu_info = ntohl(info); |
| 410 | if (!sock_owned_by_user(sk)) |
| 411 | tcp_v6_mtu_reduced(sk); |
Julian Anastasov | d013ef2a | 2012-09-05 10:53:18 +0000 | [diff] [blame] | 412 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
| 413 | &tp->tsq_flags)) |
| 414 | sock_hold(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | goto out; |
| 416 | } |
| 417 | |
| 418 | icmpv6_err_convert(type, code, &err); |
| 419 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 420 | /* Might be for an request_sock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | switch (sk->sk_state) { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 422 | struct request_sock *req, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | case TCP_LISTEN: |
| 424 | if (sock_owned_by_user(sk)) |
| 425 | goto out; |
| 426 | |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 427 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 428 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
| 429 | &hdr->saddr, inet6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | if (!req) |
| 431 | goto out; |
| 432 | |
| 433 | /* ICMPs are not backlogged, hence we cannot get |
| 434 | * an established socket here. |
| 435 | */ |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 436 | WARN_ON(req->sk != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 438 | if (seq != tcp_rsk(req)->snt_isn) { |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 439 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | goto out; |
| 441 | } |
| 442 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 443 | inet_csk_reqsk_queue_drop(sk, req, prev); |
Vijay Subramanian | 5f1e942 | 2013-01-31 08:24:19 +0000 | [diff] [blame] | 444 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | goto out; |
| 446 | |
| 447 | case TCP_SYN_SENT: |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 448 | case TCP_SYN_RECV: |
| 449 | /* Only in fast or simultaneous open. If a fast open socket is |
| 450 | * is already accepted it is treated as a connected one below. |
| 451 | */ |
| 452 | if (fastopen && fastopen->sk == NULL) |
| 453 | break; |
| 454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | if (!sock_owned_by_user(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | sk->sk_err = err; |
| 457 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ |
| 458 | |
| 459 | tcp_done(sk); |
| 460 | } else |
| 461 | sk->sk_err_soft = err; |
| 462 | goto out; |
| 463 | } |
| 464 | |
| 465 | if (!sock_owned_by_user(sk) && np->recverr) { |
| 466 | sk->sk_err = err; |
| 467 | sk->sk_error_report(sk); |
| 468 | } else |
| 469 | sk->sk_err_soft = err; |
| 470 | |
| 471 | out: |
| 472 | bh_unlock_sock(sk); |
| 473 | sock_put(sk); |
| 474 | } |
| 475 | |
| 476 | |
Neal Cardwell | 9f10d3f | 2012-06-28 12:34:21 +0000 | [diff] [blame] | 477 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
Octavian Purdila | d6274bd | 2014-06-25 17:09:58 +0300 | [diff] [blame] | 478 | struct flowi *fl, |
Neal Cardwell | 3840a06 | 2012-06-28 12:34:19 +0000 | [diff] [blame] | 479 | struct request_sock *req, |
Daniel Lee | 3a19ce0 | 2014-05-11 20:22:13 -0700 | [diff] [blame] | 480 | u16 queue_mapping, |
| 481 | struct tcp_fastopen_cookie *foc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 483 | struct inet_request_sock *ireq = inet_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | struct ipv6_pinfo *np = inet6_sk(sk); |
Octavian Purdila | d6274bd | 2014-06-25 17:09:58 +0300 | [diff] [blame] | 485 | struct flowi6 *fl6 = &fl->u.ip6; |
Weilong Chen | 4c99aa4 | 2013-12-19 18:44:34 +0800 | [diff] [blame] | 486 | struct sk_buff *skb; |
Neal Cardwell | 9494218 | 2012-06-28 12:34:20 +0000 | [diff] [blame] | 487 | int err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
Neal Cardwell | 9f10d3f | 2012-06-28 12:34:21 +0000 | [diff] [blame] | 489 | /* First, grab a route. */ |
| 490 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) |
Denis V. Lunev | fd80eb9 | 2008-02-29 11:43:03 -0800 | [diff] [blame] | 491 | goto done; |
Neal Cardwell | 9494218 | 2012-06-28 12:34:20 +0000 | [diff] [blame] | 492 | |
Daniel Lee | 3a19ce0 | 2014-05-11 20:22:13 -0700 | [diff] [blame] | 493 | skb = tcp_make_synack(sk, dst, req, foc); |
Neal Cardwell | 9494218 | 2012-06-28 12:34:20 +0000 | [diff] [blame] | 494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | if (skb) { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 496 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
| 497 | &ireq->ir_v6_rmt_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 499 | fl6->daddr = ireq->ir_v6_rmt_addr; |
Florent Fourcot | df3687f | 2014-01-17 17:15:03 +0100 | [diff] [blame] | 500 | if (np->repflow && (ireq->pktopts != NULL)) |
| 501 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
| 502 | |
Eric Dumazet | fff3269 | 2012-06-01 01:47:50 +0000 | [diff] [blame] | 503 | skb_set_queue_mapping(skb, queue_mapping); |
RongQing.Li | 43264e0 | 2012-07-01 17:18:59 +0000 | [diff] [blame] | 504 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 505 | err = net_xmit_eval(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
| 507 | |
| 508 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | return err; |
| 510 | } |
| 511 | |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 512 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 513 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 515 | kfree_skb(inet_rsk(req)->pktopts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | } |
| 517 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 518 | #ifdef CONFIG_TCP_MD5SIG |
| 519 | 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] | 520 | const struct in6_addr *addr) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 521 | { |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 522 | 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] | 523 | } |
| 524 | |
| 525 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, |
| 526 | struct sock *addr_sk) |
| 527 | { |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 528 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, |
| 532 | struct request_sock *req) |
| 533 | { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 534 | return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 535 | } |
| 536 | |
Wang Yufen | 4aa956d | 2014-03-29 09:27:29 +0800 | [diff] [blame] | 537 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
| 538 | int optlen) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 539 | { |
| 540 | struct tcp_md5sig cmd; |
| 541 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 542 | |
| 543 | if (optlen < sizeof(cmd)) |
| 544 | return -EINVAL; |
| 545 | |
| 546 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
| 547 | return -EFAULT; |
| 548 | |
| 549 | if (sin6->sin6_family != AF_INET6) |
| 550 | return -EINVAL; |
| 551 | |
| 552 | if (!cmd.tcpm_keylen) { |
Brian Haley | e773e4f | 2007-08-24 23:16:08 -0700 | [diff] [blame] | 553 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 554 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
| 555 | AF_INET); |
| 556 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
| 557 | AF_INET6); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 558 | } |
| 559 | |
| 560 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| 561 | return -EINVAL; |
| 562 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 563 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
| 564 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
| 565 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 566 | |
Eric Dumazet | a915da9b | 2012-01-31 05:18:33 +0000 | [diff] [blame] | 567 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
| 568 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 569 | } |
| 570 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 571 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 572 | const struct in6_addr *daddr, |
| 573 | const struct in6_addr *saddr, int nbytes) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 574 | { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 575 | struct tcp6_pseudohdr *bp; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 576 | struct scatterlist sg; |
YOSHIFUJI Hideaki | 8d26d76 | 2008-04-17 13:19:16 +0900 | [diff] [blame] | 577 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 578 | bp = &hp->md5_blk.ip6; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 579 | /* 1. TCP pseudo-header (RFC2460) */ |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 580 | bp->saddr = *saddr; |
| 581 | bp->daddr = *daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 582 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
Adam Langley | 00b1304 | 2008-07-31 21:36:07 -0700 | [diff] [blame] | 583 | bp->len = cpu_to_be32(nbytes); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 584 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 585 | sg_init_one(&sg, bp, sizeof(*bp)); |
| 586 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); |
| 587 | } |
David S. Miller | c7da57a | 2007-10-26 00:41:21 -0700 | [diff] [blame] | 588 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 589 | 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] | 590 | const struct in6_addr *daddr, struct in6_addr *saddr, |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 591 | const struct tcphdr *th) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 592 | { |
| 593 | struct tcp_md5sig_pool *hp; |
| 594 | struct hash_desc *desc; |
| 595 | |
| 596 | hp = tcp_get_md5sig_pool(); |
| 597 | if (!hp) |
| 598 | goto clear_hash_noput; |
| 599 | desc = &hp->md5_desc; |
| 600 | |
| 601 | if (crypto_hash_init(desc)) |
| 602 | goto clear_hash; |
| 603 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) |
| 604 | goto clear_hash; |
| 605 | if (tcp_md5_hash_header(hp, th)) |
| 606 | goto clear_hash; |
| 607 | if (tcp_md5_hash_key(hp, key)) |
| 608 | goto clear_hash; |
| 609 | if (crypto_hash_final(desc, md5_hash)) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 610 | goto clear_hash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 611 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 612 | tcp_put_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 613 | return 0; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 614 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 615 | clear_hash: |
| 616 | tcp_put_md5sig_pool(); |
| 617 | clear_hash_noput: |
| 618 | memset(md5_hash, 0, 16); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 619 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 620 | } |
| 621 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 622 | 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] | 623 | const struct sock *sk, |
| 624 | const struct request_sock *req, |
| 625 | const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 626 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 627 | const struct in6_addr *saddr, *daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 628 | struct tcp_md5sig_pool *hp; |
| 629 | struct hash_desc *desc; |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 630 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 631 | |
| 632 | if (sk) { |
| 633 | saddr = &inet6_sk(sk)->saddr; |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 634 | daddr = &sk->sk_v6_daddr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 635 | } else if (req) { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 636 | saddr = &inet_rsk(req)->ir_v6_loc_addr; |
| 637 | daddr = &inet_rsk(req)->ir_v6_rmt_addr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 638 | } else { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 639 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 640 | saddr = &ip6h->saddr; |
| 641 | daddr = &ip6h->daddr; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 642 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 643 | |
| 644 | hp = tcp_get_md5sig_pool(); |
| 645 | if (!hp) |
| 646 | goto clear_hash_noput; |
| 647 | desc = &hp->md5_desc; |
| 648 | |
| 649 | if (crypto_hash_init(desc)) |
| 650 | goto clear_hash; |
| 651 | |
| 652 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) |
| 653 | goto clear_hash; |
| 654 | if (tcp_md5_hash_header(hp, th)) |
| 655 | goto clear_hash; |
| 656 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) |
| 657 | goto clear_hash; |
| 658 | if (tcp_md5_hash_key(hp, key)) |
| 659 | goto clear_hash; |
| 660 | if (crypto_hash_final(desc, md5_hash)) |
| 661 | goto clear_hash; |
| 662 | |
| 663 | tcp_put_md5sig_pool(); |
| 664 | return 0; |
| 665 | |
| 666 | clear_hash: |
| 667 | tcp_put_md5sig_pool(); |
| 668 | clear_hash_noput: |
| 669 | memset(md5_hash, 0, 16); |
| 670 | return 1; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 671 | } |
| 672 | |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 673 | static int __tcp_v6_inbound_md5_hash(struct sock *sk, |
| 674 | const struct sk_buff *skb) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 675 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 676 | const __u8 *hash_location = NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 677 | struct tcp_md5sig_key *hash_expected; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 678 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
Eric Dumazet | 318cf7a | 2011-10-24 02:46:04 -0400 | [diff] [blame] | 679 | const struct tcphdr *th = tcp_hdr(skb); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 680 | int genhash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 681 | u8 newhash[16]; |
| 682 | |
| 683 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); |
YOSHIFUJI Hideaki | 7d5d552 | 2008-04-17 12:29:53 +0900 | [diff] [blame] | 684 | hash_location = tcp_parse_md5sig_option(th); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 685 | |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 686 | /* We've parsed the options - do we have a hash? */ |
| 687 | if (!hash_expected && !hash_location) |
| 688 | return 0; |
| 689 | |
| 690 | if (hash_expected && !hash_location) { |
| 691 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 692 | return 1; |
| 693 | } |
| 694 | |
David S. Miller | 785957d | 2008-07-30 03:03:15 -0700 | [diff] [blame] | 695 | if (!hash_expected && hash_location) { |
| 696 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 697 | return 1; |
| 698 | } |
| 699 | |
| 700 | /* check the signature */ |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 701 | genhash = tcp_v6_md5_hash_skb(newhash, |
| 702 | hash_expected, |
| 703 | NULL, NULL, skb); |
| 704 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 705 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 706 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
| 707 | genhash ? "failed" : "mismatch", |
| 708 | &ip6h->saddr, ntohs(th->source), |
| 709 | &ip6h->daddr, ntohs(th->dest)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 710 | return 1; |
| 711 | } |
| 712 | return 0; |
| 713 | } |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 714 | |
| 715 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
| 716 | { |
| 717 | int ret; |
| 718 | |
| 719 | rcu_read_lock(); |
| 720 | ret = __tcp_v6_inbound_md5_hash(sk, skb); |
| 721 | rcu_read_unlock(); |
| 722 | |
| 723 | return ret; |
| 724 | } |
| 725 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 726 | #endif |
| 727 | |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 728 | static void tcp_v6_init_req(struct request_sock *req, struct sock *sk, |
| 729 | struct sk_buff *skb) |
| 730 | { |
| 731 | struct inet_request_sock *ireq = inet_rsk(req); |
| 732 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 733 | |
| 734 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; |
| 735 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; |
| 736 | |
| 737 | ireq->ir_iif = sk->sk_bound_dev_if; |
| 738 | |
| 739 | /* So that link locals have meaning */ |
| 740 | if (!sk->sk_bound_dev_if && |
| 741 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 742 | ireq->ir_iif = tcp_v6_iif(skb); |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 743 | |
Eric Dumazet | 04317da | 2014-09-05 15:33:32 -0700 | [diff] [blame] | 744 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
Eric Dumazet | a224772 | 2014-09-27 09:50:56 -0700 | [diff] [blame] | 745 | (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) || |
| 746 | np->rxopt.bits.rxinfo || |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 747 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
| 748 | np->rxopt.bits.rxohlim || np->repflow)) { |
| 749 | atomic_inc(&skb->users); |
| 750 | ireq->pktopts = skb; |
| 751 | } |
| 752 | } |
| 753 | |
Octavian Purdila | d94e041 | 2014-06-25 17:09:55 +0300 | [diff] [blame] | 754 | static struct dst_entry *tcp_v6_route_req(struct sock *sk, struct flowi *fl, |
| 755 | const struct request_sock *req, |
| 756 | bool *strict) |
| 757 | { |
| 758 | if (strict) |
| 759 | *strict = true; |
| 760 | return inet6_csk_route_req(sk, &fl->u.ip6, req); |
| 761 | } |
| 762 | |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 763 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | .family = AF_INET6, |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 765 | .obj_size = sizeof(struct tcp6_request_sock), |
Octavian Purdila | 5db92c9 | 2014-06-25 17:09:59 +0300 | [diff] [blame] | 766 | .rtx_syn_ack = tcp_rtx_synack, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 767 | .send_ack = tcp_v6_reqsk_send_ack, |
| 768 | .destructor = tcp_v6_reqsk_destructor, |
Octavian Purdila | 72659ec | 2010-01-17 19:09:39 -0800 | [diff] [blame] | 769 | .send_reset = tcp_v6_send_reset, |
Wang Yufen | 4aa956d | 2014-03-29 09:27:29 +0800 | [diff] [blame] | 770 | .syn_ack_timeout = tcp_syn_ack_timeout, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | }; |
| 772 | |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 773 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
Octavian Purdila | 2aec4a2 | 2014-06-25 17:10:00 +0300 | [diff] [blame] | 774 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
| 775 | sizeof(struct ipv6hdr), |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 776 | #ifdef CONFIG_TCP_MD5SIG |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 777 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
John Dykstra | e3afe7b | 2009-07-16 05:04:51 +0000 | [diff] [blame] | 778 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
Andrew Morton | b6332e6 | 2006-11-30 19:16:28 -0800 | [diff] [blame] | 779 | #endif |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 780 | .init_req = tcp_v6_init_req, |
Octavian Purdila | fb7b37a | 2014-06-25 17:09:54 +0300 | [diff] [blame] | 781 | #ifdef CONFIG_SYN_COOKIES |
| 782 | .cookie_init_seq = cookie_v6_init_sequence, |
| 783 | #endif |
Octavian Purdila | d94e041 | 2014-06-25 17:09:55 +0300 | [diff] [blame] | 784 | .route_req = tcp_v6_route_req, |
Octavian Purdila | 936b8bd | 2014-06-25 17:09:57 +0300 | [diff] [blame] | 785 | .init_seq = tcp_v6_init_sequence, |
Octavian Purdila | d6274bd | 2014-06-25 17:09:58 +0300 | [diff] [blame] | 786 | .send_synack = tcp_v6_send_synack, |
Octavian Purdila | 695da14 | 2014-06-25 17:10:01 +0300 | [diff] [blame] | 787 | .queue_hash_add = inet6_csk_reqsk_queue_hash_add, |
Octavian Purdila | 16bea70 | 2014-06-25 17:09:53 +0300 | [diff] [blame] | 788 | }; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 789 | |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 790 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
Wang Yufen | 9c76a11 | 2014-03-29 09:27:31 +0800 | [diff] [blame] | 791 | u32 tsval, u32 tsecr, int oif, |
Florent Fourcot | 1d13a96 | 2014-01-16 17:21:22 +0100 | [diff] [blame] | 792 | struct tcp_md5sig_key *key, int rst, u8 tclass, |
| 793 | u32 label) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 795 | const struct tcphdr *th = tcp_hdr(skb); |
| 796 | struct tcphdr *t1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | struct sk_buff *buff; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 798 | struct flowi6 fl6; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 799 | struct net *net = dev_net(skb_dst(skb)->dev); |
Daniel Lezcano | e504799 | 2008-03-07 11:16:26 -0800 | [diff] [blame] | 800 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
YOSHIFUJI Hideaki | 9cb5734 | 2008-01-12 02:16:03 -0800 | [diff] [blame] | 801 | unsigned int tot_len = sizeof(struct tcphdr); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 802 | struct dst_entry *dst; |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 803 | __be32 *topt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 805 | if (tsecr) |
YOSHIFUJI Hideaki | 4244f8a | 2006-10-10 19:40:50 -0700 | [diff] [blame] | 806 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 807 | #ifdef CONFIG_TCP_MD5SIG |
| 808 | if (key) |
| 809 | tot_len += TCPOLEN_MD5SIG_ALIGNED; |
| 810 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
| 812 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
| 813 | GFP_ATOMIC); |
| 814 | if (buff == NULL) |
| 815 | return; |
| 816 | |
| 817 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
| 818 | |
Ilpo Järvinen | 77c676d | 2008-10-09 14:41:38 -0700 | [diff] [blame] | 819 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
Herbert Xu | 6651ffc | 2010-04-21 00:47:15 -0700 | [diff] [blame] | 820 | skb_reset_transport_header(buff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | |
| 822 | /* Swap the send and the receive. */ |
| 823 | memset(t1, 0, sizeof(*t1)); |
| 824 | t1->dest = th->source; |
| 825 | t1->source = th->dest; |
Ilpo Järvinen | 77c676d | 2008-10-09 14:41:38 -0700 | [diff] [blame] | 826 | t1->doff = tot_len / 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | t1->seq = htonl(seq); |
| 828 | t1->ack_seq = htonl(ack); |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 829 | t1->ack = !rst || !th->ack; |
| 830 | t1->rst = rst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | t1->window = htons(win); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 832 | |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 833 | topt = (__be32 *)(t1 + 1); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 834 | |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 835 | if (tsecr) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 836 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 837 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 838 | *topt++ = htonl(tsval); |
| 839 | *topt++ = htonl(tsecr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
| 841 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 842 | #ifdef CONFIG_TCP_MD5SIG |
| 843 | if (key) { |
| 844 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| 845 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 846 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, |
Adam Langley | 90b7e11 | 2008-07-31 20:49:48 -0700 | [diff] [blame] | 847 | &ipv6_hdr(skb)->saddr, |
| 848 | &ipv6_hdr(skb)->daddr, t1); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 849 | } |
| 850 | #endif |
| 851 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 852 | memset(&fl6, 0, sizeof(fl6)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 853 | fl6.daddr = ipv6_hdr(skb)->saddr; |
| 854 | fl6.saddr = ipv6_hdr(skb)->daddr; |
Florent Fourcot | 1d13a96 | 2014-01-16 17:21:22 +0100 | [diff] [blame] | 855 | fl6.flowlabel = label; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | |
David S. Miller | e5700af | 2010-04-21 14:59:20 -0700 | [diff] [blame] | 857 | buff->ip_summed = CHECKSUM_PARTIAL; |
| 858 | buff->csum = 0; |
| 859 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 860 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 862 | fl6.flowi6_proto = IPPROTO_TCP; |
Lorenzo Colitti | a36dbdb | 2014-04-11 13:19:12 +0900 | [diff] [blame] | 863 | if (rt6_need_strict(&fl6.daddr) && !oif) |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 864 | fl6.flowi6_oif = tcp_v6_iif(skb); |
Wang Yufen | 9c76a11 | 2014-03-29 09:27:31 +0800 | [diff] [blame] | 865 | else |
| 866 | fl6.flowi6_oif = oif; |
Lorenzo Colitti | e110861 | 2014-05-13 10:17:33 -0700 | [diff] [blame] | 867 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 868 | fl6.fl6_dport = t1->dest; |
| 869 | fl6.fl6_sport = t1->source; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 870 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 872 | /* Pass a socket to ip6_dst_lookup either it is for RST |
| 873 | * Underlying function will use this to retrieve the network |
| 874 | * namespace |
| 875 | */ |
Steffen Klassert | 0e0d44a | 2013-08-28 08:04:14 +0200 | [diff] [blame] | 876 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 877 | if (!IS_ERR(dst)) { |
| 878 | skb_dst_set(buff, dst); |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 879 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 880 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
| 881 | if (rst) |
| 882 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); |
| 883 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } |
| 885 | |
| 886 | kfree_skb(buff); |
| 887 | } |
| 888 | |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 889 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
| 890 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 891 | const struct tcphdr *th = tcp_hdr(skb); |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 892 | u32 seq = 0, ack_seq = 0; |
Guo-Fu Tseng | fa3e5b4 | 2008-10-09 21:11:56 -0700 | [diff] [blame] | 893 | struct tcp_md5sig_key *key = NULL; |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 894 | #ifdef CONFIG_TCP_MD5SIG |
| 895 | const __u8 *hash_location = NULL; |
| 896 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
| 897 | unsigned char newhash[16]; |
| 898 | int genhash; |
| 899 | struct sock *sk1 = NULL; |
| 900 | #endif |
Wang Yufen | 9c76a11 | 2014-03-29 09:27:31 +0800 | [diff] [blame] | 901 | int oif; |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 902 | |
| 903 | if (th->rst) |
| 904 | return; |
| 905 | |
| 906 | if (!ipv6_unicast_destination(skb)) |
| 907 | return; |
| 908 | |
| 909 | #ifdef CONFIG_TCP_MD5SIG |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 910 | hash_location = tcp_parse_md5sig_option(th); |
| 911 | if (!sk && hash_location) { |
| 912 | /* |
| 913 | * active side is lost. Try to find listening socket through |
| 914 | * source port, and then find md5 key through listening socket. |
| 915 | * we are not loose security here: |
| 916 | * Incoming packet is checked with md5 hash with finding key, |
| 917 | * no RST generated if md5 hash doesn't match. |
| 918 | */ |
| 919 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), |
Tom Herbert | 5ba2495 | 2013-01-22 09:50:39 +0000 | [diff] [blame] | 920 | &tcp_hashinfo, &ipv6h->saddr, |
| 921 | th->source, &ipv6h->daddr, |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 922 | ntohs(th->source), tcp_v6_iif(skb)); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 923 | if (!sk1) |
| 924 | return; |
| 925 | |
| 926 | rcu_read_lock(); |
| 927 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); |
| 928 | if (!key) |
| 929 | goto release_sk1; |
| 930 | |
| 931 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); |
| 932 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
| 933 | goto release_sk1; |
| 934 | } else { |
| 935 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; |
| 936 | } |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 937 | #endif |
| 938 | |
| 939 | if (th->ack) |
| 940 | seq = ntohl(th->ack_seq); |
| 941 | else |
| 942 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - |
| 943 | (th->doff << 2); |
| 944 | |
Wang Yufen | 9c76a11 | 2014-03-29 09:27:31 +0800 | [diff] [blame] | 945 | oif = sk ? sk->sk_bound_dev_if : 0; |
| 946 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
Shawn Lu | 658ddaa | 2012-01-31 22:35:48 +0000 | [diff] [blame] | 947 | |
| 948 | #ifdef CONFIG_TCP_MD5SIG |
| 949 | release_sk1: |
| 950 | if (sk1) { |
| 951 | rcu_read_unlock(); |
| 952 | sock_put(sk1); |
| 953 | } |
| 954 | #endif |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 955 | } |
| 956 | |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 957 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
Wang Yufen | 9c76a11 | 2014-03-29 09:27:31 +0800 | [diff] [blame] | 958 | u32 win, u32 tsval, u32 tsecr, int oif, |
Florent Fourcot | 1d13a96 | 2014-01-16 17:21:22 +0100 | [diff] [blame] | 959 | struct tcp_md5sig_key *key, u8 tclass, |
| 960 | u32 label) |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 961 | { |
Wang Yufen | 9c76a11 | 2014-03-29 09:27:31 +0800 | [diff] [blame] | 962 | tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, oif, key, 0, tclass, |
Florent Fourcot | 1d13a96 | 2014-01-16 17:21:22 +0100 | [diff] [blame] | 963 | label); |
Ilpo Järvinen | 626e264 | 2008-10-09 14:42:40 -0700 | [diff] [blame] | 964 | } |
| 965 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| 967 | { |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 968 | struct inet_timewait_sock *tw = inet_twsk(sk); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 969 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
YOSHIFUJI Hideaki | 9501f97 | 2008-04-18 12:45:16 +0900 | [diff] [blame] | 971 | 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] | 972 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
Andrey Vagin | ee684b6 | 2013-02-11 05:50:19 +0000 | [diff] [blame] | 973 | tcp_time_stamp + tcptw->tw_ts_offset, |
Wang Yufen | 9c76a11 | 2014-03-29 09:27:31 +0800 | [diff] [blame] | 974 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
Florent Fourcot | 1d13a96 | 2014-01-16 17:21:22 +0100 | [diff] [blame] | 975 | tw->tw_tclass, (tw->tw_flowlabel << 12)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 977 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | } |
| 979 | |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 980 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
| 981 | struct request_sock *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | { |
Daniel Lee | 3a19ce0 | 2014-05-11 20:22:13 -0700 | [diff] [blame] | 983 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
| 984 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. |
| 985 | */ |
| 986 | tcp_v6_send_ack(skb, (sk->sk_state == TCP_LISTEN) ? |
| 987 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
| 988 | tcp_rsk(req)->rcv_nxt, |
Wang Yufen | 9c76a11 | 2014-03-29 09:27:31 +0800 | [diff] [blame] | 989 | req->rcv_wnd, tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, |
Florent Fourcot | 1d13a96 | 2014-01-16 17:21:22 +0100 | [diff] [blame] | 990 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
| 991 | 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | } |
| 993 | |
| 994 | |
Weilong Chen | 4c99aa4 | 2013-12-19 18:44:34 +0800 | [diff] [blame] | 995 | static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | { |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 997 | struct request_sock *req, **prev; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 998 | const struct tcphdr *th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | struct sock *nsk; |
| 1000 | |
| 1001 | /* Find possible connection requests. */ |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 1002 | req = inet6_csk_search_req(sk, &prev, th->source, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1003 | &ipv6_hdr(skb)->saddr, |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 1004 | &ipv6_hdr(skb)->daddr, tcp_v6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | if (req) |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 1006 | return tcp_check_req(sk, skb, req, prev, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1008 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 1009 | &ipv6_hdr(skb)->saddr, th->source, |
| 1010 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), |
| 1011 | tcp_v6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | |
| 1013 | if (nsk) { |
| 1014 | if (nsk->sk_state != TCP_TIME_WAIT) { |
| 1015 | bh_lock_sock(nsk); |
| 1016 | return nsk; |
| 1017 | } |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1018 | inet_twsk_put(inet_twsk(nsk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | return NULL; |
| 1020 | } |
| 1021 | |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1022 | #ifdef CONFIG_SYN_COOKIES |
Florian Westphal | af9b473 | 2010-06-03 00:43:44 +0000 | [diff] [blame] | 1023 | if (!th->syn) |
Glenn Griffin | c6aefaf | 2008-02-07 21:49:26 -0800 | [diff] [blame] | 1024 | sk = cookie_v6_check(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | #endif |
| 1026 | return sk; |
| 1027 | } |
| 1028 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
| 1030 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | if (skb->protocol == htons(ETH_P_IP)) |
| 1032 | return tcp_v4_conn_request(sk, skb); |
| 1033 | |
| 1034 | if (!ipv6_unicast_destination(skb)) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1035 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | |
Octavian Purdila | 1fb6f15 | 2014-06-25 17:10:02 +0300 | [diff] [blame] | 1037 | return tcp_conn_request(&tcp6_request_sock_ops, |
| 1038 | &tcp_request_sock_ipv6_ops, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | drop: |
Vijay Subramanian | 5f1e942 | 2013-01-31 08:24:19 +0000 | [diff] [blame] | 1041 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | return 0; /* don't send reset */ |
| 1043 | } |
| 1044 | |
Weilong Chen | 4c99aa4 | 2013-12-19 18:44:34 +0800 | [diff] [blame] | 1045 | static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
| 1046 | struct request_sock *req, |
| 1047 | struct dst_entry *dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | { |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1049 | struct inet_request_sock *ireq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
| 1051 | struct tcp6_sock *newtcp6sk; |
| 1052 | struct inet_sock *newinet; |
| 1053 | struct tcp_sock *newtp; |
| 1054 | struct sock *newsk; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1055 | #ifdef CONFIG_TCP_MD5SIG |
| 1056 | struct tcp_md5sig_key *key; |
| 1057 | #endif |
Neal Cardwell | 3840a06 | 2012-06-28 12:34:19 +0000 | [diff] [blame] | 1058 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | |
| 1060 | if (skb->protocol == htons(ETH_P_IP)) { |
| 1061 | /* |
| 1062 | * v6 mapped |
| 1063 | */ |
| 1064 | |
| 1065 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); |
| 1066 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1067 | if (newsk == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | return NULL; |
| 1069 | |
| 1070 | newtcp6sk = (struct tcp6_sock *)newsk; |
| 1071 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| 1072 | |
| 1073 | newinet = inet_sk(newsk); |
| 1074 | newnp = inet6_sk(newsk); |
| 1075 | newtp = tcp_sk(newsk); |
| 1076 | |
| 1077 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 1078 | |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 1079 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1081 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 1083 | newsk->sk_v6_rcv_saddr = newnp->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1085 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1087 | #ifdef CONFIG_TCP_MD5SIG |
| 1088 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; |
| 1089 | #endif |
| 1090 | |
Yan, Zheng | 676a118 | 2011-09-25 02:21:30 +0000 | [diff] [blame] | 1091 | newnp->ipv6_ac_list = NULL; |
| 1092 | newnp->ipv6_fl_list = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | newnp->pktoptions = NULL; |
| 1094 | newnp->opt = NULL; |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 1095 | newnp->mcast_oif = tcp_v6_iif(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1096 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
Florent Fourcot | 1397ed3 | 2013-12-08 15:46:57 +0100 | [diff] [blame] | 1097 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
Florent Fourcot | df3687f | 2014-01-17 17:15:03 +0100 | [diff] [blame] | 1098 | if (np->repflow) |
| 1099 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1101 | /* |
| 1102 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count |
| 1103 | * here, tcp_create_openreq_child now does this for us, see the comment in |
| 1104 | * that function for the gory details. -acme |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | |
| 1107 | /* It is tricky place. Until this moment IPv4 tcp |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1108 | worked with IPv6 icsk.icsk_af_ops. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | Sync it now. |
| 1110 | */ |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1111 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
| 1113 | return newsk; |
| 1114 | } |
| 1115 | |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1116 | ireq = inet_rsk(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | |
| 1118 | if (sk_acceptq_is_full(sk)) |
| 1119 | goto out_overflow; |
| 1120 | |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1121 | if (!dst) { |
Neal Cardwell | 3840a06 | 2012-06-28 12:34:19 +0000 | [diff] [blame] | 1122 | dst = inet6_csk_route_req(sk, &fl6, req); |
David S. Miller | 493f377 | 2010-12-02 12:14:29 -0800 | [diff] [blame] | 1123 | if (!dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | goto out; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1125 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | |
| 1127 | newsk = tcp_create_openreq_child(sk, req, skb); |
| 1128 | if (newsk == NULL) |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1129 | goto out_nonewsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1131 | /* |
| 1132 | * No need to charge this sock to the relevant IPv6 refcnt debug socks |
| 1133 | * count here, tcp_create_openreq_child now does this for us, see the |
| 1134 | * comment in that function for the gory details. -acme |
| 1135 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | |
Stephen Hemminger | 59eed27 | 2006-08-25 15:55:43 -0700 | [diff] [blame] | 1137 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 1138 | __ip6_dst_store(newsk, dst, NULL, NULL); |
Neal Cardwell | fae6ef8 | 2012-08-19 03:30:38 +0000 | [diff] [blame] | 1139 | inet6_sk_rx_dst_set(newsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
| 1141 | newtcp6sk = (struct tcp6_sock *)newsk; |
| 1142 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| 1143 | |
| 1144 | newtp = tcp_sk(newsk); |
| 1145 | newinet = inet_sk(newsk); |
| 1146 | newnp = inet6_sk(newsk); |
| 1147 | |
| 1148 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 1149 | |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1150 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
| 1151 | newnp->saddr = ireq->ir_v6_loc_addr; |
| 1152 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; |
| 1153 | newsk->sk_bound_dev_if = ireq->ir_iif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | |
Tom Herbert | b73c3d0 | 2014-07-01 21:32:17 -0700 | [diff] [blame] | 1155 | ip6_set_txhash(newsk); |
| 1156 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1157 | /* Now IPv6 options... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | |
| 1159 | First: no IPv4 options. |
| 1160 | */ |
Eric Dumazet | f6d8bd0 | 2011-04-21 09:45:37 +0000 | [diff] [blame] | 1161 | newinet->inet_opt = NULL; |
Yan, Zheng | 676a118 | 2011-09-25 02:21:30 +0000 | [diff] [blame] | 1162 | newnp->ipv6_ac_list = NULL; |
Masayuki Nakagawa | d35690b | 2007-03-16 16:14:03 -0700 | [diff] [blame] | 1163 | newnp->ipv6_fl_list = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | |
| 1165 | /* Clone RX bits */ |
| 1166 | newnp->rxopt.all = np->rxopt.all; |
| 1167 | |
| 1168 | /* Clone pktoptions received with SYN */ |
| 1169 | newnp->pktoptions = NULL; |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1170 | if (ireq->pktopts != NULL) { |
| 1171 | newnp->pktoptions = skb_clone(ireq->pktopts, |
Mel Gorman | 99a1dec | 2012-07-31 16:44:14 -0700 | [diff] [blame] | 1172 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1173 | consume_skb(ireq->pktopts); |
| 1174 | ireq->pktopts = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | if (newnp->pktoptions) |
| 1176 | skb_set_owner_r(newnp->pktoptions, newsk); |
| 1177 | } |
| 1178 | newnp->opt = NULL; |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 1179 | newnp->mcast_oif = tcp_v6_iif(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1180 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
Florent Fourcot | 1397ed3 | 2013-12-08 15:46:57 +0100 | [diff] [blame] | 1181 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
Florent Fourcot | df3687f | 2014-01-17 17:15:03 +0100 | [diff] [blame] | 1182 | if (np->repflow) |
| 1183 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | |
| 1185 | /* Clone native IPv6 options from listening socket (if any) |
| 1186 | |
| 1187 | Yes, keeping reference count would be much more clever, |
| 1188 | but we make one more one thing there: reattach optmem |
| 1189 | to newsk. |
| 1190 | */ |
RongQing.Li | 43264e0 | 2012-07-01 17:18:59 +0000 | [diff] [blame] | 1191 | if (np->opt) |
| 1192 | newnp->opt = ipv6_dup_options(newsk, np->opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1194 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | if (newnp->opt) |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1196 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
| 1197 | newnp->opt->opt_flen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | |
| 1199 | tcp_sync_mss(newsk, dst_mtu(dst)); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 1200 | newtp->advmss = dst_metric_advmss(dst); |
Neal Cardwell | d135c52 | 2012-04-22 09:45:47 +0000 | [diff] [blame] | 1201 | if (tcp_sk(sk)->rx_opt.user_mss && |
| 1202 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) |
| 1203 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; |
| 1204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | tcp_initialize_rcv_mss(newsk); |
| 1206 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1207 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
| 1208 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1210 | #ifdef CONFIG_TCP_MD5SIG |
| 1211 | /* Copy over the MD5 key from the original socket */ |
Wang Yufen | 4aa956d | 2014-03-29 09:27:29 +0800 | [diff] [blame] | 1212 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
| 1213 | if (key != NULL) { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1214 | /* We're using one, so create a matching key |
| 1215 | * on the newsk structure. If we fail to get |
| 1216 | * memory, then we end up not copying the key |
| 1217 | * across. Shucks. |
| 1218 | */ |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 1219 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
Mel Gorman | 99a1dec | 2012-07-31 16:44:14 -0700 | [diff] [blame] | 1220 | AF_INET6, key->key, key->keylen, |
| 1221 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1222 | } |
| 1223 | #endif |
| 1224 | |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1225 | if (__inet_inherit_port(sk, newsk) < 0) { |
Christoph Paasch | e337e24 | 2012-12-14 04:07:58 +0000 | [diff] [blame] | 1226 | inet_csk_prepare_forced_close(newsk); |
| 1227 | tcp_done(newsk); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1228 | goto out; |
| 1229 | } |
Eric Dumazet | 9327f70 | 2009-12-04 03:46:54 +0000 | [diff] [blame] | 1230 | __inet6_hash(newsk, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | |
| 1232 | return newsk; |
| 1233 | |
| 1234 | out_overflow: |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1235 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1236 | out_nonewsk: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | dst_release(dst); |
Balazs Scheidler | 093d282 | 2010-10-21 13:06:43 +0200 | [diff] [blame] | 1238 | out: |
| 1239 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | return NULL; |
| 1241 | } |
| 1242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | /* The socket must have it's spinlock held when we get |
| 1244 | * here. |
| 1245 | * |
| 1246 | * We have a potential double-lock case here, so even when |
| 1247 | * doing backlog processing we use the BH locking scheme. |
| 1248 | * This is because we cannot sleep with the original spinlock |
| 1249 | * held. |
| 1250 | */ |
| 1251 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 1252 | { |
| 1253 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1254 | struct tcp_sock *tp; |
| 1255 | struct sk_buff *opt_skb = NULL; |
| 1256 | |
| 1257 | /* Imagine: socket is IPv6. IPv4 packet arrives, |
| 1258 | goes to IPv4 receive handler and backlogged. |
| 1259 | From backlog it always goes here. Kerboom... |
| 1260 | Fortunately, tcp_rcv_established and rcv_established |
| 1261 | handle them correctly, but it is not case with |
| 1262 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK |
| 1263 | */ |
| 1264 | |
| 1265 | if (skb->protocol == htons(ETH_P_IP)) |
| 1266 | return tcp_v4_do_rcv(sk, skb); |
| 1267 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1268 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | goto discard; |
| 1270 | |
| 1271 | /* |
| 1272 | * socket locking is here for SMP purposes as backlog rcv |
| 1273 | * is currently called with bh processing disabled. |
| 1274 | */ |
| 1275 | |
| 1276 | /* Do Stevens' IPV6_PKTOPTIONS. |
| 1277 | |
| 1278 | Yes, guys, it is the only place in our code, where we |
| 1279 | may make it not affecting IPv4. |
| 1280 | The rest of code is protocol independent, |
| 1281 | and I do not like idea to uglify IPv4. |
| 1282 | |
| 1283 | Actually, all the idea behind IPV6_PKTOPTIONS |
| 1284 | looks not very well thought. For now we latch |
| 1285 | options, received in the last packet, enqueued |
| 1286 | by tcp. Feel free to propose better solution. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1287 | --ANK (980728) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | */ |
| 1289 | if (np->rxopt.all) |
Mel Gorman | 99a1dec | 2012-07-31 16:44:14 -0700 | [diff] [blame] | 1290 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | |
| 1292 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 1293 | struct dst_entry *dst = sk->sk_rx_dst; |
| 1294 | |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1295 | sock_rps_save_rxhash(sk, skb); |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 1296 | if (dst) { |
| 1297 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || |
| 1298 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { |
| 1299 | dst_release(dst); |
| 1300 | sk->sk_rx_dst = NULL; |
| 1301 | } |
| 1302 | } |
| 1303 | |
Vijay Subramanian | c995ae2 | 2013-09-03 12:23:22 -0700 | [diff] [blame] | 1304 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | if (opt_skb) |
| 1306 | goto ipv6_pktoptions; |
| 1307 | return 0; |
| 1308 | } |
| 1309 | |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 1310 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | goto csum_err; |
| 1312 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1313 | if (sk->sk_state == TCP_LISTEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
| 1315 | if (!nsk) |
| 1316 | goto discard; |
| 1317 | |
| 1318 | /* |
| 1319 | * Queue it on the new socket if the new socket is active, |
| 1320 | * otherwise we just shortcircuit this and continue with |
| 1321 | * the new socket.. |
| 1322 | */ |
Weilong Chen | 4c99aa4 | 2013-12-19 18:44:34 +0800 | [diff] [blame] | 1323 | if (nsk != sk) { |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1324 | sock_rps_save_rxhash(nsk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | if (tcp_child_process(sk, nsk, skb)) |
| 1326 | goto reset; |
| 1327 | if (opt_skb) |
| 1328 | __kfree_skb(opt_skb); |
| 1329 | return 0; |
| 1330 | } |
Neil Horman | 47482f1 | 2011-04-06 13:07:09 -0700 | [diff] [blame] | 1331 | } else |
Tom Herbert | bdeab99 | 2011-08-14 19:45:55 +0000 | [diff] [blame] | 1332 | sock_rps_save_rxhash(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1334 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | goto reset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | if (opt_skb) |
| 1337 | goto ipv6_pktoptions; |
| 1338 | return 0; |
| 1339 | |
| 1340 | reset: |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1341 | tcp_v6_send_reset(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | discard: |
| 1343 | if (opt_skb) |
| 1344 | __kfree_skb(opt_skb); |
| 1345 | kfree_skb(skb); |
| 1346 | return 0; |
| 1347 | csum_err: |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1348 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1349 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | goto discard; |
| 1351 | |
| 1352 | |
| 1353 | ipv6_pktoptions: |
| 1354 | /* Do you ask, what is it? |
| 1355 | |
| 1356 | 1. skb was enqueued by tcp. |
| 1357 | 2. skb is added to tail of read queue, rather than out of order. |
| 1358 | 3. socket is not in passive state. |
| 1359 | 4. Finally, it really contains options, which user wants to receive. |
| 1360 | */ |
| 1361 | tp = tcp_sk(sk); |
| 1362 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && |
| 1363 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1364 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 1365 | np->mcast_oif = tcp_v6_iif(opt_skb); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 1366 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1367 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
Florent Fourcot | 82e9f10 | 2013-12-08 15:46:59 +0100 | [diff] [blame] | 1368 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
Florent Fourcot | 1397ed3 | 2013-12-08 15:46:57 +0100 | [diff] [blame] | 1369 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
Florent Fourcot | df3687f | 2014-01-17 17:15:03 +0100 | [diff] [blame] | 1370 | if (np->repflow) |
| 1371 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); |
Eric Dumazet | a224772 | 2014-09-27 09:50:56 -0700 | [diff] [blame] | 1372 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | skb_set_owner_r(opt_skb, sk); |
| 1374 | opt_skb = xchg(&np->pktoptions, opt_skb); |
| 1375 | } else { |
| 1376 | __kfree_skb(opt_skb); |
| 1377 | opt_skb = xchg(&np->pktoptions, NULL); |
| 1378 | } |
| 1379 | } |
| 1380 | |
Wei Yongjun | 800d55f | 2009-02-23 21:45:33 +0000 | [diff] [blame] | 1381 | kfree_skb(opt_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | return 0; |
| 1383 | } |
| 1384 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 1385 | static int tcp_v6_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1387 | const struct tcphdr *th; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 1388 | const struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | struct sock *sk; |
| 1390 | int ret; |
Pavel Emelyanov | a86b1e3 | 2008-07-16 20:20:58 -0700 | [diff] [blame] | 1391 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | |
| 1393 | if (skb->pkt_type != PACKET_HOST) |
| 1394 | goto discard_it; |
| 1395 | |
| 1396 | /* |
| 1397 | * Count it even if it's bad. |
| 1398 | */ |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1399 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | |
| 1401 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| 1402 | goto discard_it; |
| 1403 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1404 | th = tcp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | |
| 1406 | if (th->doff < sizeof(struct tcphdr)/4) |
| 1407 | goto bad_packet; |
| 1408 | if (!pskb_may_pull(skb, th->doff*4)) |
| 1409 | goto discard_it; |
| 1410 | |
Tom Herbert | e4f45b7 | 2014-05-02 16:29:51 -0700 | [diff] [blame] | 1411 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1412 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1414 | th = tcp_hdr(skb); |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 1415 | hdr = ipv6_hdr(skb); |
Eric Dumazet | 971f10e | 2014-09-27 09:50:57 -0700 | [diff] [blame] | 1416 | /* This is tricky : We move IPCB at its correct location into TCP_SKB_CB() |
| 1417 | * barrier() makes sure compiler wont play fool^Waliasing games. |
| 1418 | */ |
| 1419 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), |
| 1420 | sizeof(struct inet6_skb_parm)); |
| 1421 | barrier(); |
| 1422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| 1424 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| 1425 | skb->len - th->doff*4); |
| 1426 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
Eric Dumazet | e11ecdd | 2014-09-15 04:19:51 -0700 | [diff] [blame] | 1427 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); |
Eric Dumazet | 04317da | 2014-09-05 15:33:32 -0700 | [diff] [blame] | 1428 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; |
Eric Dumazet | b82d1bb | 2011-09-27 02:20:08 -0400 | [diff] [blame] | 1429 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | TCP_SKB_CB(skb)->sacked = 0; |
| 1431 | |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 1432 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest, |
| 1433 | tcp_v6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | if (!sk) |
| 1435 | goto no_tcp_socket; |
| 1436 | |
| 1437 | process: |
| 1438 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1439 | goto do_time_wait; |
| 1440 | |
Stephen Hemminger | e802af9 | 2010-04-22 15:24:53 -0700 | [diff] [blame] | 1441 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
| 1442 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); |
| 1443 | goto discard_and_relse; |
| 1444 | } |
| 1445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1447 | goto discard_and_relse; |
| 1448 | |
Dmitry Popov | 9ea88a1 | 2014-08-07 02:38:22 +0400 | [diff] [blame] | 1449 | #ifdef CONFIG_TCP_MD5SIG |
| 1450 | if (tcp_v6_inbound_md5_hash(sk, skb)) |
| 1451 | goto discard_and_relse; |
| 1452 | #endif |
| 1453 | |
Dmitry Mishin | fda9ef5 | 2006-08-31 15:28:39 -0700 | [diff] [blame] | 1454 | if (sk_filter(sk, skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | goto discard_and_relse; |
| 1456 | |
Eliezer Tamir | 8b80cda | 2013-07-10 17:13:26 +0300 | [diff] [blame] | 1457 | sk_mark_napi_id(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | skb->dev = NULL; |
| 1459 | |
Fabio Olive Leite | 293b9c4 | 2006-09-25 22:28:47 -0700 | [diff] [blame] | 1460 | bh_lock_sock_nested(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | ret = 0; |
| 1462 | if (!sock_owned_by_user(sk)) { |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 1463 | if (!tcp_prequeue(sk, skb)) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1464 | ret = tcp_v6_do_rcv(sk, skb); |
Eric Dumazet | da882c1 | 2012-04-22 23:38:54 +0000 | [diff] [blame] | 1465 | } else if (unlikely(sk_add_backlog(sk, skb, |
| 1466 | sk->sk_rcvbuf + sk->sk_sndbuf))) { |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1467 | bh_unlock_sock(sk); |
Eric Dumazet | 6cce09f | 2010-03-07 23:21:57 +0000 | [diff] [blame] | 1468 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
Zhu Yi | 6b03a53 | 2010-03-04 18:01:41 +0000 | [diff] [blame] | 1469 | goto discard_and_relse; |
| 1470 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | bh_unlock_sock(sk); |
| 1472 | |
| 1473 | sock_put(sk); |
| 1474 | return ret ? -1 : 0; |
| 1475 | |
| 1476 | no_tcp_socket: |
| 1477 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1478 | goto discard_it; |
| 1479 | |
| 1480 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1481 | csum_error: |
| 1482 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | bad_packet: |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 1484 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | } else { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1486 | tcp_v6_send_reset(NULL, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | } |
| 1488 | |
| 1489 | discard_it: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | kfree_skb(skb); |
| 1491 | return 0; |
| 1492 | |
| 1493 | discard_and_relse: |
| 1494 | sock_put(sk); |
| 1495 | goto discard_it; |
| 1496 | |
| 1497 | do_time_wait: |
| 1498 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1499 | inet_twsk_put(inet_twsk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | goto discard_it; |
| 1501 | } |
| 1502 | |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1503 | if (skb->len < (th->doff<<2)) { |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1504 | inet_twsk_put(inet_twsk(sk)); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 1505 | goto bad_packet; |
| 1506 | } |
| 1507 | if (tcp_checksum_complete(skb)) { |
| 1508 | inet_twsk_put(inet_twsk(sk)); |
| 1509 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | } |
| 1511 | |
YOSHIFUJI Hideaki | 9469c7b | 2006-10-10 19:41:46 -0700 | [diff] [blame] | 1512 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | case TCP_TW_SYN: |
| 1514 | { |
| 1515 | struct sock *sk2; |
| 1516 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 1517 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
Tom Herbert | 5ba2495 | 2013-01-22 09:50:39 +0000 | [diff] [blame] | 1518 | &ipv6_hdr(skb)->saddr, th->source, |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1519 | &ipv6_hdr(skb)->daddr, |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 1520 | ntohs(th->dest), tcp_v6_iif(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | if (sk2 != NULL) { |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 1522 | struct inet_timewait_sock *tw = inet_twsk(sk); |
| 1523 | inet_twsk_deschedule(tw, &tcp_death_row); |
| 1524 | inet_twsk_put(tw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | sk = sk2; |
| 1526 | goto process; |
| 1527 | } |
| 1528 | /* Fall through to ACK */ |
| 1529 | } |
| 1530 | case TCP_TW_ACK: |
| 1531 | tcp_v6_timewait_ack(sk, skb); |
| 1532 | break; |
| 1533 | case TCP_TW_RST: |
| 1534 | goto no_tcp_socket; |
Wang Yufen | 4aa956d | 2014-03-29 09:27:29 +0800 | [diff] [blame] | 1535 | case TCP_TW_SUCCESS: |
| 1536 | ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | } |
| 1538 | goto discard_it; |
| 1539 | } |
| 1540 | |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 1541 | static void tcp_v6_early_demux(struct sk_buff *skb) |
| 1542 | { |
| 1543 | const struct ipv6hdr *hdr; |
| 1544 | const struct tcphdr *th; |
| 1545 | struct sock *sk; |
| 1546 | |
| 1547 | if (skb->pkt_type != PACKET_HOST) |
| 1548 | return; |
| 1549 | |
| 1550 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) |
| 1551 | return; |
| 1552 | |
| 1553 | hdr = ipv6_hdr(skb); |
| 1554 | th = tcp_hdr(skb); |
| 1555 | |
| 1556 | if (th->doff < sizeof(struct tcphdr) / 4) |
| 1557 | return; |
| 1558 | |
Eric Dumazet | 870c315 | 2014-10-17 09:17:20 -0700 | [diff] [blame] | 1559 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 1560 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
| 1561 | &hdr->saddr, th->source, |
| 1562 | &hdr->daddr, ntohs(th->dest), |
| 1563 | inet6_iif(skb)); |
| 1564 | if (sk) { |
| 1565 | skb->sk = sk; |
| 1566 | skb->destructor = sock_edemux; |
| 1567 | if (sk->sk_state != TCP_TIME_WAIT) { |
| 1568 | struct dst_entry *dst = sk->sk_rx_dst; |
Neal Cardwell | f3f1213 | 2012-10-22 21:41:48 +0000 | [diff] [blame] | 1569 | |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 1570 | if (dst) |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 1571 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 1572 | if (dst && |
Neal Cardwell | f3f1213 | 2012-10-22 21:41:48 +0000 | [diff] [blame] | 1573 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 1574 | skb_dst_set_noref(skb, dst); |
| 1575 | } |
| 1576 | } |
| 1577 | } |
| 1578 | |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1579 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
| 1580 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
| 1581 | .twsk_unique = tcp_twsk_unique, |
Wang Yufen | 4aa956d | 2014-03-29 09:27:29 +0800 | [diff] [blame] | 1582 | .twsk_destructor = tcp_twsk_destructor, |
David S. Miller | ccb7c41 | 2010-12-01 18:09:13 -0800 | [diff] [blame] | 1583 | }; |
| 1584 | |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 1585 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1586 | .queue_xmit = inet6_csk_xmit, |
| 1587 | .send_check = tcp_v6_send_check, |
| 1588 | .rebuild_header = inet6_sk_rebuild_header, |
Eric Dumazet | 5d299f3 | 2012-08-06 05:09:33 +0000 | [diff] [blame] | 1589 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1590 | .conn_request = tcp_v6_conn_request, |
| 1591 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1592 | .net_header_len = sizeof(struct ipv6hdr), |
Eric Dumazet | 6746960 | 2012-04-24 07:37:38 +0000 | [diff] [blame] | 1593 | .net_frag_header_len = sizeof(struct frag_hdr), |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1594 | .setsockopt = ipv6_setsockopt, |
| 1595 | .getsockopt = ipv6_getsockopt, |
| 1596 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
| 1597 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1598 | .bind_conflict = inet6_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1599 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1600 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 1601 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1602 | #endif |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 1603 | .mtu_reduced = tcp_v6_mtu_reduced, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | }; |
| 1605 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1606 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1607 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1608 | .md5_lookup = tcp_v6_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1609 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1610 | .md5_parse = tcp_v6_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1611 | }; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 1612 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | /* |
| 1615 | * TCP over IPv4 via INET6 API |
| 1616 | */ |
Stephen Hemminger | 3b401a8 | 2009-09-01 19:25:04 +0000 | [diff] [blame] | 1617 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1618 | .queue_xmit = ip_queue_xmit, |
| 1619 | .send_check = tcp_v4_send_check, |
| 1620 | .rebuild_header = inet_sk_rebuild_header, |
Eric Dumazet | 63d02d1 | 2012-08-09 14:11:00 +0000 | [diff] [blame] | 1621 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1622 | .conn_request = tcp_v6_conn_request, |
| 1623 | .syn_recv_sock = tcp_v6_syn_recv_sock, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1624 | .net_header_len = sizeof(struct iphdr), |
| 1625 | .setsockopt = ipv6_setsockopt, |
| 1626 | .getsockopt = ipv6_getsockopt, |
| 1627 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
| 1628 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1629 | .bind_conflict = inet6_csk_bind_conflict, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1630 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1631 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 1632 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1633 | #endif |
Neal Cardwell | 4fab907 | 2014-08-14 12:40:05 -0400 | [diff] [blame] | 1634 | .mtu_reduced = tcp_v4_mtu_reduced, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | }; |
| 1636 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1637 | #ifdef CONFIG_TCP_MD5SIG |
Stephen Hemminger | b2e4b3d | 2009-09-01 19:25:03 +0000 | [diff] [blame] | 1638 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1639 | .md5_lookup = tcp_v4_md5_lookup, |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 1640 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1641 | .md5_parse = tcp_v6_parse_md5_keys, |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1642 | }; |
David S. Miller | a928630 | 2006-11-14 19:53:22 -0800 | [diff] [blame] | 1643 | #endif |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | /* NOTE: A lot of things set to zero explicitly by call to |
| 1646 | * sk_alloc() so need not be done here. |
| 1647 | */ |
| 1648 | static int tcp_v6_init_sock(struct sock *sk) |
| 1649 | { |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1650 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 1652 | tcp_init_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | |
Arnaldo Carvalho de Melo | 8292a17 | 2005-12-13 23:15:52 -0800 | [diff] [blame] | 1654 | icsk->icsk_af_ops = &ipv6_specific; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1656 | #ifdef CONFIG_TCP_MD5SIG |
David S. Miller | ac807fa | 2012-04-23 03:21:58 -0400 | [diff] [blame] | 1657 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 1658 | #endif |
| 1659 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | return 0; |
| 1661 | } |
| 1662 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1663 | static void tcp_v6_destroy_sock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | tcp_v4_destroy_sock(sk); |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1666 | inet6_destroy_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | } |
| 1668 | |
YOSHIFUJI Hideaki | 952a10b | 2007-04-21 20:13:44 +0900 | [diff] [blame] | 1669 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | /* Proc filesystem TCPv6 sock list dumping. */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1671 | static void get_openreq6(struct seq_file *seq, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 1672 | const struct sock *sk, struct request_sock *req, int i, kuid_t uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1673 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | int ttd = req->expires - jiffies; |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1675 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
| 1676 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | |
| 1678 | if (ttd < 0) |
| 1679 | ttd = 0; |
| 1680 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | seq_printf(seq, |
| 1682 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
Francesco Fusco | d14c5ab | 2013-08-15 13:42:14 +0200 | [diff] [blame] | 1683 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | i, |
| 1685 | src->s6_addr32[0], src->s6_addr32[1], |
| 1686 | src->s6_addr32[2], src->s6_addr32[3], |
Eric Dumazet | b44084c | 2013-10-10 00:04:37 -0700 | [diff] [blame] | 1687 | inet_rsk(req)->ir_num, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1689 | dest->s6_addr32[2], dest->s6_addr32[3], |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 1690 | ntohs(inet_rsk(req)->ir_rmt_port), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | TCP_SYN_RECV, |
Weilong Chen | 4c99aa4 | 2013-12-19 18:44:34 +0800 | [diff] [blame] | 1692 | 0, 0, /* could print option size, but that is af dependent. */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1693 | 1, /* timers active (only the expire timer) */ |
| 1694 | jiffies_to_clock_t(ttd), |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 1695 | req->num_timeout, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 1696 | from_kuid_munged(seq_user_ns(seq), uid), |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1697 | 0, /* non standard timer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | 0, /* open_requests have no inode */ |
| 1699 | 0, req); |
| 1700 | } |
| 1701 | |
| 1702 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) |
| 1703 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 1704 | const struct in6_addr *dest, *src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | __u16 destp, srcp; |
| 1706 | int timer_active; |
| 1707 | unsigned long timer_expires; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1708 | const struct inet_sock *inet = inet_sk(sp); |
| 1709 | const struct tcp_sock *tp = tcp_sk(sp); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1710 | const struct inet_connection_sock *icsk = inet_csk(sp); |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 1711 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 1713 | dest = &sp->sk_v6_daddr; |
| 1714 | src = &sp->sk_v6_rcv_saddr; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1715 | destp = ntohs(inet->inet_dport); |
| 1716 | srcp = ntohs(inet->inet_sport); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1717 | |
| 1718 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | timer_active = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1720 | timer_expires = icsk->icsk_timeout; |
| 1721 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | timer_active = 4; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1723 | timer_expires = icsk->icsk_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | } else if (timer_pending(&sp->sk_timer)) { |
| 1725 | timer_active = 2; |
| 1726 | timer_expires = sp->sk_timer.expires; |
| 1727 | } else { |
| 1728 | timer_active = 0; |
| 1729 | timer_expires = jiffies; |
| 1730 | } |
| 1731 | |
| 1732 | seq_printf(seq, |
| 1733 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
Francesco Fusco | d14c5ab | 2013-08-15 13:42:14 +0200 | [diff] [blame] | 1734 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | i, |
| 1736 | src->s6_addr32[0], src->s6_addr32[1], |
| 1737 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 1738 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1739 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1740 | sp->sk_state, |
Sridhar Samudrala | 47da8ee | 2006-06-27 13:29:00 -0700 | [diff] [blame] | 1741 | tp->write_seq-tp->snd_una, |
| 1742 | (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] | 1743 | timer_active, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 1744 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1745 | icsk->icsk_retransmits, |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 1746 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1747 | icsk->icsk_probes_out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | sock_i_ino(sp), |
| 1749 | atomic_read(&sp->sk_refcnt), sp, |
Stephen Hemminger | 7be8735 | 2008-06-27 20:00:19 -0700 | [diff] [blame] | 1750 | jiffies_to_clock_t(icsk->icsk_rto), |
| 1751 | jiffies_to_clock_t(icsk->icsk_ack.ato), |
Weilong Chen | 4c99aa4 | 2013-12-19 18:44:34 +0800 | [diff] [blame] | 1752 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
Ilpo Järvinen | 0b6a05c | 2009-09-15 01:30:10 -0700 | [diff] [blame] | 1753 | tp->snd_cwnd, |
Yuchung Cheng | 0a672f7 | 2014-05-11 20:22:12 -0700 | [diff] [blame] | 1754 | sp->sk_state == TCP_LISTEN ? |
| 1755 | (fastopenq ? fastopenq->max_qlen : 0) : |
| 1756 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | ); |
| 1758 | } |
| 1759 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1760 | static void get_timewait6_sock(struct seq_file *seq, |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1761 | struct inet_timewait_sock *tw, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 1763 | const struct in6_addr *dest, *src; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | __u16 destp, srcp; |
Eric Dumazet | 96f817f | 2013-10-03 14:27:25 -0700 | [diff] [blame] | 1765 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 1767 | dest = &tw->tw_v6_daddr; |
| 1768 | src = &tw->tw_v6_rcv_saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | destp = ntohs(tw->tw_dport); |
| 1770 | srcp = ntohs(tw->tw_sport); |
| 1771 | |
| 1772 | seq_printf(seq, |
| 1773 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 1774 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | i, |
| 1776 | src->s6_addr32[0], src->s6_addr32[1], |
| 1777 | src->s6_addr32[2], src->s6_addr32[3], srcp, |
| 1778 | dest->s6_addr32[0], dest->s6_addr32[1], |
| 1779 | dest->s6_addr32[2], dest->s6_addr32[3], destp, |
| 1780 | tw->tw_substate, 0, 0, |
Eric Dumazet | a399a80 | 2012-08-08 21:13:53 +0000 | [diff] [blame] | 1781 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | atomic_read(&tw->tw_refcnt), tw); |
| 1783 | } |
| 1784 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
| 1786 | { |
| 1787 | struct tcp_iter_state *st; |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1788 | struct sock *sk = v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | |
| 1790 | if (v == SEQ_START_TOKEN) { |
| 1791 | seq_puts(seq, |
| 1792 | " sl " |
| 1793 | "local_address " |
| 1794 | "remote_address " |
| 1795 | "st tx_queue rx_queue tr tm->when retrnsmt" |
| 1796 | " uid timeout inode\n"); |
| 1797 | goto out; |
| 1798 | } |
| 1799 | st = seq->private; |
| 1800 | |
| 1801 | switch (st->state) { |
| 1802 | case TCP_SEQ_STATE_LISTENING: |
| 1803 | case TCP_SEQ_STATE_ESTABLISHED: |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 1804 | if (sk->sk_state == TCP_TIME_WAIT) |
| 1805 | get_timewait6_sock(seq, v, st->num); |
| 1806 | else |
| 1807 | get_tcp6_sock(seq, v, st->num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | break; |
| 1809 | case TCP_SEQ_STATE_OPENREQ: |
| 1810 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); |
| 1811 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | } |
| 1813 | out: |
| 1814 | return 0; |
| 1815 | } |
| 1816 | |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 1817 | static const struct file_operations tcp6_afinfo_seq_fops = { |
| 1818 | .owner = THIS_MODULE, |
| 1819 | .open = tcp_seq_open, |
| 1820 | .read = seq_read, |
| 1821 | .llseek = seq_lseek, |
| 1822 | .release = seq_release_net |
| 1823 | }; |
| 1824 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | .name = "tcp6", |
| 1827 | .family = AF_INET6, |
Arjan van de Ven | 73cb88e | 2011-10-30 06:46:30 +0000 | [diff] [blame] | 1828 | .seq_fops = &tcp6_afinfo_seq_fops, |
Denis V. Lunev | 9427c4b | 2008-04-13 22:12:13 -0700 | [diff] [blame] | 1829 | .seq_ops = { |
| 1830 | .show = tcp6_seq_show, |
| 1831 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | }; |
| 1833 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1834 | int __net_init tcp6_proc_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | { |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 1836 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | } |
| 1838 | |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 1839 | void tcp6_proc_exit(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | { |
Daniel Lezcano | 6f8b13b | 2008-03-21 04:14:45 -0700 | [diff] [blame] | 1841 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | } |
| 1843 | #endif |
| 1844 | |
Eric Dumazet | f77d602 | 2013-05-09 10:28:16 +0000 | [diff] [blame] | 1845 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
| 1846 | { |
| 1847 | struct inet_sock *inet = inet_sk(sk); |
| 1848 | |
| 1849 | /* we do not want to clear pinet6 field, because of RCU lookups */ |
| 1850 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); |
| 1851 | |
| 1852 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); |
| 1853 | memset(&inet->pinet6 + 1, 0, size); |
| 1854 | } |
| 1855 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | struct proto tcpv6_prot = { |
| 1857 | .name = "TCPv6", |
| 1858 | .owner = THIS_MODULE, |
| 1859 | .close = tcp_close, |
| 1860 | .connect = tcp_v6_connect, |
| 1861 | .disconnect = tcp_disconnect, |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1862 | .accept = inet_csk_accept, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | .ioctl = tcp_ioctl, |
| 1864 | .init = tcp_v6_init_sock, |
| 1865 | .destroy = tcp_v6_destroy_sock, |
| 1866 | .shutdown = tcp_shutdown, |
| 1867 | .setsockopt = tcp_setsockopt, |
| 1868 | .getsockopt = tcp_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | .recvmsg = tcp_recvmsg, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 1870 | .sendmsg = tcp_sendmsg, |
| 1871 | .sendpage = tcp_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | .backlog_rcv = tcp_v6_do_rcv, |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 1873 | .release_cb = tcp_release_cb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | .hash = tcp_v6_hash, |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1875 | .unhash = inet_unhash, |
| 1876 | .get_port = inet_csk_get_port, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | .enter_memory_pressure = tcp_enter_memory_pressure, |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 1878 | .stream_memory_free = tcp_stream_memory_free, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | .sockets_allocated = &tcp_sockets_allocated, |
| 1880 | .memory_allocated = &tcp_memory_allocated, |
| 1881 | .memory_pressure = &tcp_memory_pressure, |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 1882 | .orphan_count = &tcp_orphan_count, |
Eric W. Biederman | a4fe34b | 2013-10-19 16:25:36 -0700 | [diff] [blame] | 1883 | .sysctl_mem = sysctl_tcp_mem, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | .sysctl_wmem = sysctl_tcp_wmem, |
| 1885 | .sysctl_rmem = sysctl_tcp_rmem, |
| 1886 | .max_header = MAX_TCP_HEADER, |
| 1887 | .obj_size = sizeof(struct tcp6_sock), |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1888 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 1889 | .twsk_prot = &tcp6_timewait_sock_ops, |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 1890 | .rsk_prot = &tcp6_request_sock_ops, |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 1891 | .h.hashinfo = &tcp_hashinfo, |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 1892 | .no_autobind = true, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1893 | #ifdef CONFIG_COMPAT |
| 1894 | .compat_setsockopt = compat_tcp_setsockopt, |
| 1895 | .compat_getsockopt = compat_tcp_getsockopt, |
| 1896 | #endif |
Andrew Morton | c255a45 | 2012-07-31 16:43:02 -0700 | [diff] [blame] | 1897 | #ifdef CONFIG_MEMCG_KMEM |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 1898 | .proto_cgroup = tcp_proto_cgroup, |
| 1899 | #endif |
Eric Dumazet | f77d602 | 2013-05-09 10:28:16 +0000 | [diff] [blame] | 1900 | .clear_sk = tcp_v6_clear_sk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | }; |
| 1902 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 1903 | static const struct inet6_protocol tcpv6_protocol = { |
Eric Dumazet | c710998 | 2012-07-26 12:18:11 +0000 | [diff] [blame] | 1904 | .early_demux = tcp_v6_early_demux, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | .handler = tcp_v6_rcv, |
| 1906 | .err_handler = tcp_v6_err, |
| 1907 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| 1908 | }; |
| 1909 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | static struct inet_protosw tcpv6_protosw = { |
| 1911 | .type = SOCK_STREAM, |
| 1912 | .protocol = IPPROTO_TCP, |
| 1913 | .prot = &tcpv6_prot, |
| 1914 | .ops = &inet6_stream_ops, |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1915 | .flags = INET_PROTOSW_PERMANENT | |
| 1916 | INET_PROTOSW_ICSK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | }; |
| 1918 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1919 | static int __net_init tcpv6_net_init(struct net *net) |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 1920 | { |
Denis V. Lunev | 5677242 | 2008-04-03 14:28:30 -0700 | [diff] [blame] | 1921 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
| 1922 | SOCK_RAW, IPPROTO_TCP, net); |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 1923 | } |
| 1924 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1925 | static void __net_exit tcpv6_net_exit(struct net *net) |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 1926 | { |
Denis V. Lunev | 5677242 | 2008-04-03 14:28:30 -0700 | [diff] [blame] | 1927 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 1928 | } |
| 1929 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1930 | 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] | 1931 | { |
| 1932 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 1933 | } |
| 1934 | |
| 1935 | static struct pernet_operations tcpv6_net_ops = { |
Eric W. Biederman | b099ce2 | 2009-12-03 02:29:09 +0000 | [diff] [blame] | 1936 | .init = tcpv6_net_init, |
| 1937 | .exit = tcpv6_net_exit, |
| 1938 | .exit_batch = tcpv6_net_exit_batch, |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 1939 | }; |
| 1940 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1941 | int __init tcpv6_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | { |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1943 | int ret; |
David Woodhouse | ae0f7d5 | 2006-01-11 15:53:04 -0800 | [diff] [blame] | 1944 | |
Vlad Yasevich | 3336288 | 2012-11-15 08:49:15 +0000 | [diff] [blame] | 1945 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
| 1946 | if (ret) |
Vlad Yasevich | c6b641a | 2012-11-15 08:49:22 +0000 | [diff] [blame] | 1947 | goto out; |
Vlad Yasevich | 3336288 | 2012-11-15 08:49:15 +0000 | [diff] [blame] | 1948 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1949 | /* register inet6 protocol */ |
| 1950 | ret = inet6_register_protosw(&tcpv6_protosw); |
| 1951 | if (ret) |
| 1952 | goto out_tcpv6_protocol; |
| 1953 | |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 1954 | ret = register_pernet_subsys(&tcpv6_net_ops); |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1955 | if (ret) |
| 1956 | goto out_tcpv6_protosw; |
| 1957 | out: |
| 1958 | return ret; |
| 1959 | |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1960 | out_tcpv6_protosw: |
| 1961 | inet6_unregister_protosw(&tcpv6_protosw); |
Vlad Yasevich | 3336288 | 2012-11-15 08:49:15 +0000 | [diff] [blame] | 1962 | out_tcpv6_protocol: |
| 1963 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1964 | goto out; |
| 1965 | } |
| 1966 | |
Daniel Lezcano | 09f7709 | 2007-12-13 05:34:58 -0800 | [diff] [blame] | 1967 | void tcpv6_exit(void) |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1968 | { |
Daniel Lezcano | 93ec926 | 2008-03-07 11:16:02 -0800 | [diff] [blame] | 1969 | unregister_pernet_subsys(&tcpv6_net_ops); |
Daniel Lezcano | 7f4e486 | 2007-12-11 02:25:35 -0800 | [diff] [blame] | 1970 | inet6_unregister_protosw(&tcpv6_protosw); |
| 1971 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | } |