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/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> 23 #include <net/inet_ecn.h> 24 #include <net/inet_hashtables.h> 25 #include <net/ip6_route.h> 26 #include <net/sock.h> 27 #include <net/inet6_connection_sock.h> 28 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 */ 36 sk_for_each_bound(sk2, node, &tb->owners) { 37 if (sk != sk2 && 38 (!sk->sk_bound_dev_if || 39 !sk2->sk_bound_dev_if || 40 sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && 41 (!sk->sk_reuse || !sk2->sk_reuse || 42 sk2->sk_state == TCP_LISTEN) && 43 ipv6_rcv_saddr_equal(sk, sk2)) 44 break; 45 } 46 47 return node != NULL; 48 } 49 50 EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); 51 52 /* 53 * request_sock (formerly open request) hash tables. 54 */ 55 static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, 56 const u32 rnd, const u16 synq_hsize) 57 { 58 u32 a = (__force u32)raddr->s6_addr32[0]; 59 u32 b = (__force u32)raddr->s6_addr32[1]; 60 u32 c = (__force u32)raddr->s6_addr32[2]; 61 62 a += JHASH_GOLDEN_RATIO; 63 b += JHASH_GOLDEN_RATIO; 64 c += rnd; 65 __jhash_mix(a, b, c); 66 67 a += (__force u32)raddr->s6_addr32[3]; 68 b += (__force u32)rport; 69 __jhash_mix(a, b, c); 70 71 return c & (synq_hsize - 1); 72 } 73 74 struct request_sock *inet6_csk_search_req(const struct sock *sk, 75 struct request_sock ***prevp, 76 const __be16 rport, 77 const struct in6_addr *raddr, 78 const struct in6_addr *laddr, 79 const int iif) 80 { 81 const struct inet_connection_sock *icsk = inet_csk(sk); 82 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 83 struct request_sock *req, **prev; 84 85 for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, 86 lopt->hash_rnd, 87 lopt->nr_table_entries)]; 88 (req = *prev) != NULL; 89 prev = &req->dl_next) { 90 const struct inet6_request_sock *treq = inet6_rsk(req); 91 92 if (inet_rsk(req)->rmt_port == rport && 93 req->rsk_ops->family == AF_INET6 && 94 ipv6_addr_equal(&treq->rmt_addr, raddr) && 95 ipv6_addr_equal(&treq->loc_addr, laddr) && 96 (!treq->iif || treq->iif == iif)) { 97 BUG_TRAP(req->sk == NULL); 98 *prevp = prev; 99 return req; 100 } 101 } 102 103 return NULL; 104 } 105 106 EXPORT_SYMBOL_GPL(inet6_csk_search_req); 107 108 void inet6_csk_reqsk_queue_hash_add(struct sock *sk, 109 struct request_sock *req, 110 const unsigned long timeout) 111 { 112 struct inet_connection_sock *icsk = inet_csk(sk); 113 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 114 const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, 115 inet_rsk(req)->rmt_port, 116 lopt->hash_rnd, lopt->nr_table_entries); 117 118 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); 119 inet_csk_reqsk_queue_added(sk, timeout); 120 } 121 122 EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); 123 124 void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) 125 { 126 struct ipv6_pinfo *np = inet6_sk(sk); 127 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; 128 129 sin6->sin6_family = AF_INET6; 130 ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); 131 sin6->sin6_port = inet_sk(sk)->dport; 132 /* We do not store received flowlabel for TCP */ 133 sin6->sin6_flowinfo = 0; 134 sin6->sin6_scope_id = 0; 135 if (sk->sk_bound_dev_if && 136 ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 137 sin6->sin6_scope_id = sk->sk_bound_dev_if; 138 } 139 140 EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); 141 142 int inet6_csk_xmit(struct sk_buff *skb, int ipfragok) 143 { 144 struct sock *sk = skb->sk; 145 struct inet_sock *inet = inet_sk(sk); 146 struct ipv6_pinfo *np = inet6_sk(sk); 147 struct flowi fl; 148 struct dst_entry *dst; 149 struct in6_addr *final_p = NULL, final; 150 151 memset(&fl, 0, sizeof(fl)); 152 fl.proto = sk->sk_protocol; 153 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 154 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 155 fl.fl6_flowlabel = np->flow_label; 156 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); 157 fl.oif = sk->sk_bound_dev_if; 158 fl.fl_ip_sport = inet->sport; 159 fl.fl_ip_dport = inet->dport; 160 security_sk_classify_flow(sk, &fl); 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 kfree_skb(skb); 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; 185 kfree_skb(skb); 186 return err; 187 } 188 189 __ip6_dst_store(sk, dst, NULL, NULL); 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