Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * Support for INET6 connection oriented protocols. |
| 7 | * |
| 8 | * Authors: See the TCPv6 sources |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or(at your option) any later version. |
| 14 | */ |
| 15 | |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 16 | #include <linux/module.h> |
| 17 | #include <linux/in6.h> |
| 18 | #include <linux/ipv6.h> |
| 19 | #include <linux/jhash.h> |
| 20 | |
| 21 | #include <net/addrconf.h> |
| 22 | #include <net/inet_connection_sock.h> |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 23 | #include <net/inet_ecn.h> |
| 24 | #include <net/inet_hashtables.h> |
| 25 | #include <net/ip6_route.h> |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 26 | #include <net/sock.h> |
Adrian Bunk | 9f5336e | 2006-01-07 13:24:25 -0800 | [diff] [blame] | 27 | #include <net/inet6_connection_sock.h> |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 28 | |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 29 | int inet6_csk_bind_conflict(const struct sock *sk, |
| 30 | const struct inet_bind_bucket *tb) |
| 31 | { |
| 32 | const struct sock *sk2; |
| 33 | const struct hlist_node *node; |
| 34 | |
| 35 | /* We must walk the whole port owner list in this case. -DaveM */ |
Pavel Emelyanov | 7477fd2e | 2008-04-14 02:42:27 -0700 | [diff] [blame] | 36 | /* |
| 37 | * See comment in inet_csk_bind_conflict about sock lookup |
| 38 | * vs net namespaces issues. |
| 39 | */ |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 40 | sk_for_each_bound(sk2, node, &tb->owners) { |
| 41 | if (sk != sk2 && |
| 42 | (!sk->sk_bound_dev_if || |
| 43 | !sk2->sk_bound_dev_if || |
| 44 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && |
| 45 | (!sk->sk_reuse || !sk2->sk_reuse || |
| 46 | sk2->sk_state == TCP_LISTEN) && |
| 47 | ipv6_rcv_saddr_equal(sk, sk2)) |
| 48 | break; |
| 49 | } |
| 50 | |
| 51 | return node != NULL; |
| 52 | } |
| 53 | |
| 54 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); |
| 55 | |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 56 | /* |
| 57 | * request_sock (formerly open request) hash tables. |
| 58 | */ |
Al Viro | fede70b | 2006-11-08 00:25:41 -0800 | [diff] [blame] | 59 | static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 60 | const u32 rnd, const u16 synq_hsize) |
| 61 | { |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 62 | u32 a = (__force u32)raddr->s6_addr32[0]; |
| 63 | u32 b = (__force u32)raddr->s6_addr32[1]; |
| 64 | u32 c = (__force u32)raddr->s6_addr32[2]; |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 65 | |
| 66 | a += JHASH_GOLDEN_RATIO; |
| 67 | b += JHASH_GOLDEN_RATIO; |
| 68 | c += rnd; |
| 69 | __jhash_mix(a, b, c); |
| 70 | |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 71 | a += (__force u32)raddr->s6_addr32[3]; |
Al Viro | fede70b | 2006-11-08 00:25:41 -0800 | [diff] [blame] | 72 | b += (__force u32)rport; |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 73 | __jhash_mix(a, b, c); |
| 74 | |
| 75 | return c & (synq_hsize - 1); |
| 76 | } |
| 77 | |
| 78 | struct request_sock *inet6_csk_search_req(const struct sock *sk, |
| 79 | struct request_sock ***prevp, |
Al Viro | fede70b | 2006-11-08 00:25:41 -0800 | [diff] [blame] | 80 | const __be16 rport, |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 81 | const struct in6_addr *raddr, |
| 82 | const struct in6_addr *laddr, |
| 83 | const int iif) |
| 84 | { |
| 85 | const struct inet_connection_sock *icsk = inet_csk(sk); |
| 86 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; |
| 87 | struct request_sock *req, **prev; |
| 88 | |
| 89 | for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, |
| 90 | lopt->hash_rnd, |
| 91 | lopt->nr_table_entries)]; |
| 92 | (req = *prev) != NULL; |
| 93 | prev = &req->dl_next) { |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 94 | const struct inet6_request_sock *treq = inet6_rsk(req); |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 95 | |
| 96 | if (inet_rsk(req)->rmt_port == rport && |
| 97 | req->rsk_ops->family == AF_INET6 && |
| 98 | ipv6_addr_equal(&treq->rmt_addr, raddr) && |
| 99 | ipv6_addr_equal(&treq->loc_addr, laddr) && |
| 100 | (!treq->iif || treq->iif == iif)) { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 101 | WARN_ON(req->sk != NULL); |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 102 | *prevp = prev; |
| 103 | return req; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | return NULL; |
| 108 | } |
| 109 | |
| 110 | EXPORT_SYMBOL_GPL(inet6_csk_search_req); |
| 111 | |
| 112 | void inet6_csk_reqsk_queue_hash_add(struct sock *sk, |
| 113 | struct request_sock *req, |
| 114 | const unsigned long timeout) |
| 115 | { |
| 116 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 117 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 118 | const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 119 | inet_rsk(req)->rmt_port, |
| 120 | lopt->hash_rnd, lopt->nr_table_entries); |
| 121 | |
| 122 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); |
| 123 | inet_csk_reqsk_queue_added(sk, timeout); |
| 124 | } |
| 125 | |
| 126 | EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 127 | |
| 128 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) |
| 129 | { |
| 130 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 131 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; |
| 132 | |
| 133 | sin6->sin6_family = AF_INET6; |
| 134 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); |
| 135 | sin6->sin6_port = inet_sk(sk)->dport; |
| 136 | /* We do not store received flowlabel for TCP */ |
| 137 | sin6->sin6_flowinfo = 0; |
| 138 | sin6->sin6_scope_id = 0; |
| 139 | if (sk->sk_bound_dev_if && |
| 140 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| 141 | sin6->sin6_scope_id = sk->sk_bound_dev_if; |
| 142 | } |
| 143 | |
| 144 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); |
| 145 | |
Noriaki TAKAMIYA | a47ed4c | 2007-09-06 03:31:25 -0700 | [diff] [blame] | 146 | static inline |
| 147 | void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, |
| 148 | struct in6_addr *daddr, struct in6_addr *saddr) |
| 149 | { |
| 150 | __ip6_dst_store(sk, dst, daddr, saddr); |
| 151 | |
| 152 | #ifdef CONFIG_XFRM |
Adrian Bunk | 1dff92e | 2007-10-15 01:37:55 -0700 | [diff] [blame] | 153 | { |
Noriaki TAKAMIYA | a47ed4c | 2007-09-06 03:31:25 -0700 | [diff] [blame] | 154 | struct rt6_info *rt = (struct rt6_info *)dst; |
| 155 | rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid); |
| 156 | } |
| 157 | #endif |
| 158 | } |
| 159 | |
| 160 | static inline |
| 161 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) |
| 162 | { |
| 163 | struct dst_entry *dst; |
| 164 | |
| 165 | dst = __sk_dst_check(sk, cookie); |
| 166 | |
| 167 | #ifdef CONFIG_XFRM |
| 168 | if (dst) { |
| 169 | struct rt6_info *rt = (struct rt6_info *)dst; |
| 170 | if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) { |
| 171 | sk->sk_dst_cache = NULL; |
| 172 | dst_release(dst); |
| 173 | dst = NULL; |
| 174 | } |
| 175 | } |
| 176 | #endif |
| 177 | |
| 178 | return dst; |
| 179 | } |
| 180 | |
David S. Miller | e89862f | 2007-01-26 01:04:55 -0800 | [diff] [blame] | 181 | int inet6_csk_xmit(struct sk_buff *skb, int ipfragok) |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 182 | { |
David S. Miller | e89862f | 2007-01-26 01:04:55 -0800 | [diff] [blame] | 183 | struct sock *sk = skb->sk; |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 184 | struct inet_sock *inet = inet_sk(sk); |
| 185 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 186 | struct flowi fl; |
| 187 | struct dst_entry *dst; |
| 188 | struct in6_addr *final_p = NULL, final; |
| 189 | |
| 190 | memset(&fl, 0, sizeof(fl)); |
| 191 | fl.proto = sk->sk_protocol; |
| 192 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 193 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| 194 | fl.fl6_flowlabel = np->flow_label; |
| 195 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); |
| 196 | fl.oif = sk->sk_bound_dev_if; |
| 197 | fl.fl_ip_sport = inet->sport; |
| 198 | fl.fl_ip_dport = inet->dport; |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 199 | security_sk_classify_flow(sk, &fl); |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 200 | |
| 201 | if (np->opt && np->opt->srcrt) { |
| 202 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; |
| 203 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 204 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 205 | final_p = &final; |
| 206 | } |
| 207 | |
Noriaki TAKAMIYA | a47ed4c | 2007-09-06 03:31:25 -0700 | [diff] [blame] | 208 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 209 | |
| 210 | if (dst == NULL) { |
| 211 | int err = ip6_dst_lookup(sk, &dst, &fl); |
| 212 | |
| 213 | if (err) { |
| 214 | sk->sk_err_soft = -err; |
Alexey Kuznetsov | b0013fd | 2006-05-10 13:24:38 -0700 | [diff] [blame] | 215 | kfree_skb(skb); |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 216 | return err; |
| 217 | } |
| 218 | |
| 219 | if (final_p) |
| 220 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 221 | |
Alexey Dobriyan | 52479b6 | 2008-11-25 17:35:18 -0800 | [diff] [blame^] | 222 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 223 | sk->sk_route_caps = 0; |
Alexey Kuznetsov | b0013fd | 2006-05-10 13:24:38 -0700 | [diff] [blame] | 224 | kfree_skb(skb); |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 225 | return err; |
| 226 | } |
| 227 | |
Noriaki TAKAMIYA | a47ed4c | 2007-09-06 03:31:25 -0700 | [diff] [blame] | 228 | __inet6_csk_dst_store(sk, dst, NULL, NULL); |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | skb->dst = dst_clone(dst); |
| 232 | |
| 233 | /* Restore final destination back after routing done */ |
| 234 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 235 | |
| 236 | return ip6_xmit(sk, skb, &fl, np->opt, 0); |
| 237 | } |
| 238 | |
| 239 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |