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 | |
| 16 | #include <linux/config.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/in6.h> |
| 19 | #include <linux/ipv6.h> |
| 20 | #include <linux/jhash.h> |
| 21 | |
| 22 | #include <net/addrconf.h> |
| 23 | #include <net/inet_connection_sock.h> |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 24 | #include <net/inet_ecn.h> |
| 25 | #include <net/inet_hashtables.h> |
| 26 | #include <net/ip6_route.h> |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 27 | #include <net/sock.h> |
Adrian Bunk | 9f5336e | 2006-01-07 13:24:25 -0800 | [diff] [blame] | 28 | #include <net/inet6_connection_sock.h> |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 29 | |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 30 | int inet6_csk_bind_conflict(const struct sock *sk, |
| 31 | const struct inet_bind_bucket *tb) |
| 32 | { |
| 33 | const struct sock *sk2; |
| 34 | const struct hlist_node *node; |
| 35 | |
| 36 | /* We must walk the whole port owner list in this case. -DaveM */ |
| 37 | sk_for_each_bound(sk2, node, &tb->owners) { |
| 38 | if (sk != sk2 && |
| 39 | (!sk->sk_bound_dev_if || |
| 40 | !sk2->sk_bound_dev_if || |
| 41 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && |
| 42 | (!sk->sk_reuse || !sk2->sk_reuse || |
| 43 | sk2->sk_state == TCP_LISTEN) && |
| 44 | ipv6_rcv_saddr_equal(sk, sk2)) |
| 45 | break; |
| 46 | } |
| 47 | |
| 48 | return node != NULL; |
| 49 | } |
| 50 | |
| 51 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); |
| 52 | |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 53 | /* |
| 54 | * request_sock (formerly open request) hash tables. |
| 55 | */ |
| 56 | static u32 inet6_synq_hash(const struct in6_addr *raddr, const u16 rport, |
| 57 | const u32 rnd, const u16 synq_hsize) |
| 58 | { |
| 59 | u32 a = raddr->s6_addr32[0]; |
| 60 | u32 b = raddr->s6_addr32[1]; |
| 61 | u32 c = raddr->s6_addr32[2]; |
| 62 | |
| 63 | a += JHASH_GOLDEN_RATIO; |
| 64 | b += JHASH_GOLDEN_RATIO; |
| 65 | c += rnd; |
| 66 | __jhash_mix(a, b, c); |
| 67 | |
| 68 | a += raddr->s6_addr32[3]; |
| 69 | b += (u32)rport; |
| 70 | __jhash_mix(a, b, c); |
| 71 | |
| 72 | return c & (synq_hsize - 1); |
| 73 | } |
| 74 | |
| 75 | struct request_sock *inet6_csk_search_req(const struct sock *sk, |
| 76 | struct request_sock ***prevp, |
| 77 | const __u16 rport, |
| 78 | const struct in6_addr *raddr, |
| 79 | const struct in6_addr *laddr, |
| 80 | const int iif) |
| 81 | { |
| 82 | const struct inet_connection_sock *icsk = inet_csk(sk); |
| 83 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; |
| 84 | struct request_sock *req, **prev; |
| 85 | |
| 86 | for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, |
| 87 | lopt->hash_rnd, |
| 88 | lopt->nr_table_entries)]; |
| 89 | (req = *prev) != NULL; |
| 90 | prev = &req->dl_next) { |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 91 | const struct inet6_request_sock *treq = inet6_rsk(req); |
Arnaldo Carvalho de Melo | 8129765 | 2005-12-13 23:15:24 -0800 | [diff] [blame] | 92 | |
| 93 | if (inet_rsk(req)->rmt_port == rport && |
| 94 | req->rsk_ops->family == AF_INET6 && |
| 95 | ipv6_addr_equal(&treq->rmt_addr, raddr) && |
| 96 | ipv6_addr_equal(&treq->loc_addr, laddr) && |
| 97 | (!treq->iif || treq->iif == iif)) { |
| 98 | BUG_TRAP(req->sk == NULL); |
| 99 | *prevp = prev; |
| 100 | return req; |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | return NULL; |
| 105 | } |
| 106 | |
| 107 | EXPORT_SYMBOL_GPL(inet6_csk_search_req); |
| 108 | |
| 109 | void inet6_csk_reqsk_queue_hash_add(struct sock *sk, |
| 110 | struct request_sock *req, |
| 111 | const unsigned long timeout) |
| 112 | { |
| 113 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 114 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; |
Arnaldo Carvalho de Melo | ca304b6 | 2005-12-13 23:15:40 -0800 | [diff] [blame] | 115 | 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] | 116 | inet_rsk(req)->rmt_port, |
| 117 | lopt->hash_rnd, lopt->nr_table_entries); |
| 118 | |
| 119 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); |
| 120 | inet_csk_reqsk_queue_added(sk, timeout); |
| 121 | } |
| 122 | |
| 123 | EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 124 | |
| 125 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) |
| 126 | { |
| 127 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 128 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; |
| 129 | |
| 130 | sin6->sin6_family = AF_INET6; |
| 131 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); |
| 132 | sin6->sin6_port = inet_sk(sk)->dport; |
| 133 | /* We do not store received flowlabel for TCP */ |
| 134 | sin6->sin6_flowinfo = 0; |
| 135 | sin6->sin6_scope_id = 0; |
| 136 | if (sk->sk_bound_dev_if && |
| 137 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| 138 | sin6->sin6_scope_id = sk->sk_bound_dev_if; |
| 139 | } |
| 140 | |
| 141 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); |
| 142 | |
| 143 | int inet6_csk_xmit(struct sk_buff *skb, int ipfragok) |
| 144 | { |
| 145 | struct sock *sk = skb->sk; |
| 146 | struct inet_sock *inet = inet_sk(sk); |
| 147 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 148 | struct flowi fl; |
| 149 | struct dst_entry *dst; |
| 150 | struct in6_addr *final_p = NULL, final; |
| 151 | |
| 152 | memset(&fl, 0, sizeof(fl)); |
| 153 | fl.proto = sk->sk_protocol; |
| 154 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 155 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| 156 | fl.fl6_flowlabel = np->flow_label; |
| 157 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); |
| 158 | fl.oif = sk->sk_bound_dev_if; |
| 159 | fl.fl_ip_sport = inet->sport; |
| 160 | fl.fl_ip_dport = inet->dport; |
| 161 | |
| 162 | if (np->opt && np->opt->srcrt) { |
| 163 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; |
| 164 | ipv6_addr_copy(&final, &fl.fl6_dst); |
| 165 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 166 | final_p = &final; |
| 167 | } |
| 168 | |
| 169 | dst = __sk_dst_check(sk, np->dst_cookie); |
| 170 | |
| 171 | if (dst == NULL) { |
| 172 | int err = ip6_dst_lookup(sk, &dst, &fl); |
| 173 | |
| 174 | if (err) { |
| 175 | sk->sk_err_soft = -err; |
Alexey Kuznetsov | b0013fd | 2006-05-10 13:24:38 -0700 | [diff] [blame] | 176 | kfree_skb(skb); |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 177 | return err; |
| 178 | } |
| 179 | |
| 180 | if (final_p) |
| 181 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
| 182 | |
| 183 | if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { |
| 184 | sk->sk_route_caps = 0; |
Alexey Kuznetsov | b0013fd | 2006-05-10 13:24:38 -0700 | [diff] [blame] | 185 | kfree_skb(skb); |
Arnaldo Carvalho de Melo | b9750ce | 2005-12-13 23:22:54 -0800 | [diff] [blame] | 186 | return err; |
| 187 | } |
| 188 | |
| 189 | ip6_dst_store(sk, dst, NULL); |
| 190 | sk->sk_route_caps = dst->dev->features & |
| 191 | ~(NETIF_F_IP_CSUM | NETIF_F_TSO); |
| 192 | } |
| 193 | |
| 194 | skb->dst = dst_clone(dst); |
| 195 | |
| 196 | /* Restore final destination back after routing done */ |
| 197 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| 198 | |
| 199 | return ip6_xmit(sk, skb, &fl, np->opt, 0); |
| 200 | } |
| 201 | |
| 202 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |