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#include <linux/slab.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 30int 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 /* 38 * See comment in inet_csk_bind_conflict about sock lookup 39 * vs net namespaces issues. 40 */ 41 sk_for_each_bound(sk2, node, &tb->owners) { 42 if (sk != sk2 && 43 (!sk->sk_bound_dev_if || 44 !sk2->sk_bound_dev_if || 45 sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && 46 (!sk->sk_reuse || !sk2->sk_reuse || 47 sk2->sk_state == TCP_LISTEN) && 48 ipv6_rcv_saddr_equal(sk, sk2)) 49 break; 50 } 51 52 return node != NULL; 53} 54 55EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); 56 57/* 58 * request_sock (formerly open request) hash tables. 59 */ 60static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, 61 const u32 rnd, const u16 synq_hsize) 62{ 63 u32 a = (__force u32)raddr->s6_addr32[0]; 64 u32 b = (__force u32)raddr->s6_addr32[1]; 65 u32 c = (__force u32)raddr->s6_addr32[2]; 66 67 a += JHASH_GOLDEN_RATIO; 68 b += JHASH_GOLDEN_RATIO; 69 c += rnd; 70 __jhash_mix(a, b, c); 71 72 a += (__force u32)raddr->s6_addr32[3]; 73 b += (__force u32)rport; 74 __jhash_mix(a, b, c); 75 76 return c & (synq_hsize - 1); 77} 78 79struct request_sock *inet6_csk_search_req(const struct sock *sk, 80 struct request_sock ***prevp, 81 const __be16 rport, 82 const struct in6_addr *raddr, 83 const struct in6_addr *laddr, 84 const int iif) 85{ 86 const struct inet_connection_sock *icsk = inet_csk(sk); 87 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 88 struct request_sock *req, **prev; 89 90 for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, 91 lopt->hash_rnd, 92 lopt->nr_table_entries)]; 93 (req = *prev) != NULL; 94 prev = &req->dl_next) { 95 const struct inet6_request_sock *treq = inet6_rsk(req); 96 97 if (inet_rsk(req)->rmt_port == rport && 98 req->rsk_ops->family == AF_INET6 && 99 ipv6_addr_equal(&treq->rmt_addr, raddr) && 100 ipv6_addr_equal(&treq->loc_addr, laddr) && 101 (!treq->iif || treq->iif == iif)) { 102 WARN_ON(req->sk != NULL); 103 *prevp = prev; 104 return req; 105 } 106 } 107 108 return NULL; 109} 110 111EXPORT_SYMBOL_GPL(inet6_csk_search_req); 112 113void inet6_csk_reqsk_queue_hash_add(struct sock *sk, 114 struct request_sock *req, 115 const unsigned long timeout) 116{ 117 struct inet_connection_sock *icsk = inet_csk(sk); 118 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 119 const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, 120 inet_rsk(req)->rmt_port, 121 lopt->hash_rnd, lopt->nr_table_entries); 122 123 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); 124 inet_csk_reqsk_queue_added(sk, timeout); 125} 126 127EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); 128 129void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) 130{ 131 struct ipv6_pinfo *np = inet6_sk(sk); 132 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; 133 134 sin6->sin6_family = AF_INET6; 135 ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); 136 sin6->sin6_port = inet_sk(sk)->inet_dport; 137 /* We do not store received flowlabel for TCP */ 138 sin6->sin6_flowinfo = 0; 139 sin6->sin6_scope_id = 0; 140 if (sk->sk_bound_dev_if && 141 ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 142 sin6->sin6_scope_id = sk->sk_bound_dev_if; 143} 144 145EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); 146 147static inline 148void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, 149 struct in6_addr *daddr, struct in6_addr *saddr) 150{ 151 __ip6_dst_store(sk, dst, daddr, saddr); 152 153#ifdef CONFIG_XFRM 154 { 155 struct rt6_info *rt = (struct rt6_info *)dst; 156 rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid); 157 } 158#endif 159} 160 161static inline 162struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) 163{ 164 struct dst_entry *dst; 165 166 dst = __sk_dst_check(sk, cookie); 167 168#ifdef CONFIG_XFRM 169 if (dst) { 170 struct rt6_info *rt = (struct rt6_info *)dst; 171 if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) { 172 __sk_dst_reset(sk); 173 dst = NULL; 174 } 175 } 176#endif 177 178 return dst; 179} 180 181int inet6_csk_xmit(struct sk_buff *skb) 182{ 183 struct sock *sk = skb->sk; 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, 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.mark = sk->sk_mark; 198 fl.fl_ip_sport = inet->inet_sport; 199 fl.fl_ip_dport = inet->inet_dport; 200 security_sk_classify_flow(sk, &fl); 201 202 final_p = fl6_update_dst(&fl, np->opt, &final); 203 204 dst = __inet6_csk_dst_check(sk, np->dst_cookie); 205 206 if (dst == NULL) { 207 int err = ip6_dst_lookup(sk, &dst, &fl); 208 209 if (err) { 210 sk->sk_err_soft = -err; 211 kfree_skb(skb); 212 return err; 213 } 214 215 if (final_p) 216 ipv6_addr_copy(&fl.fl6_dst, final_p); 217 218 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { 219 sk->sk_route_caps = 0; 220 kfree_skb(skb); 221 return err; 222 } 223 224 __inet6_csk_dst_store(sk, dst, NULL, NULL); 225 } 226 227 skb_dst_set(skb, dst_clone(dst)); 228 229 /* Restore final destination back after routing done */ 230 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 231 232 return ip6_xmit(sk, skb, &fl, np->opt); 233} 234 235EXPORT_SYMBOL_GPL(inet6_csk_xmit); 236