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> 24 #include <net/inet_ecn.h> 25 #include <net/inet_hashtables.h> 26 #include <net/ip6_route.h> 27 #include <net/sock.h> 28 #include <net/inet6_connection_sock.h> 29 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 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) { 91 const struct inet6_request_sock *treq = inet6_rsk(req); 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; 115 const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, 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); 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; 176 return err; 177 } 178 179 if (final_p) 180 ipv6_addr_copy(&fl.fl6_dst, final_p); 181 182 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 183 sk->sk_route_caps = 0; 184 return err; 185 } 186 187 ip6_dst_store(sk, dst, NULL); 188 sk->sk_route_caps = dst->dev->features & 189 ~(NETIF_F_IP_CSUM | NETIF_F_TSO); 190 } 191 192 skb->dst = dst_clone(dst); 193 194 /* Restore final destination back after routing done */ 195 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 196 197 return ip6_xmit(sk, skb, &fl, np->opt, 0); 198 } 199 200 EXPORT_SYMBOL_GPL(inet6_csk_xmit); 201