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.
6 * Support for INET6 connection oriented protocols.
8 * Authors: See the TCPv6 sources
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.
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>
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>
28 #include <net/inet6_connection_sock.h>
30 int inet6_csk_bind_conflict(const struct sock *sk,
31 const struct inet_bind_bucket *tb)
33 const struct sock *sk2;
34 const struct hlist_node *node;
36 /* We must walk the whole port owner list in this case. -DaveM */
38 * See comment in inet_csk_bind_conflict about sock lookup
39 * vs net namespaces issues.
41 sk_for_each_bound(sk2, node, &tb->owners) {
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))
55 EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
57 struct dst_entry *inet6_csk_route_req(struct sock *sk,
58 const struct request_sock *req)
60 struct inet6_request_sock *treq = inet6_rsk(req);
61 struct ipv6_pinfo *np = inet6_sk(sk);
62 struct in6_addr *final_p, final;
63 struct dst_entry *dst;
66 memset(&fl6, 0, sizeof(fl6));
67 fl6.flowi6_proto = IPPROTO_TCP;
68 ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr);
70 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
72 ipv6_addr_copy(&fl6.saddr, &treq->loc_addr);
73 fl6.flowi6_oif = sk->sk_bound_dev_if;
74 fl6.flowi6_mark = sk->sk_mark;
75 fl6.fl6_dport = inet_rsk(req)->rmt_port;
76 fl6.fl6_sport = inet_rsk(req)->loc_port;
77 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
79 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
87 * request_sock (formerly open request) hash tables.
89 static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
90 const u32 rnd, const u32 synq_hsize)
94 c = jhash_3words((__force u32)raddr->s6_addr32[0],
95 (__force u32)raddr->s6_addr32[1],
96 (__force u32)raddr->s6_addr32[2],
99 c = jhash_2words((__force u32)raddr->s6_addr32[3],
103 return c & (synq_hsize - 1);
106 struct request_sock *inet6_csk_search_req(const struct sock *sk,
107 struct request_sock ***prevp,
109 const struct in6_addr *raddr,
110 const struct in6_addr *laddr,
113 const struct inet_connection_sock *icsk = inet_csk(sk);
114 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
115 struct request_sock *req, **prev;
117 for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
119 lopt->nr_table_entries)];
120 (req = *prev) != NULL;
121 prev = &req->dl_next) {
122 const struct inet6_request_sock *treq = inet6_rsk(req);
124 if (inet_rsk(req)->rmt_port == rport &&
125 req->rsk_ops->family == AF_INET6 &&
126 ipv6_addr_equal(&treq->rmt_addr, raddr) &&
127 ipv6_addr_equal(&treq->loc_addr, laddr) &&
128 (!treq->iif || treq->iif == iif)) {
129 WARN_ON(req->sk != NULL);
138 EXPORT_SYMBOL_GPL(inet6_csk_search_req);
140 void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
141 struct request_sock *req,
142 const unsigned long timeout)
144 struct inet_connection_sock *icsk = inet_csk(sk);
145 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
146 const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
147 inet_rsk(req)->rmt_port,
148 lopt->hash_rnd, lopt->nr_table_entries);
150 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
151 inet_csk_reqsk_queue_added(sk, timeout);
154 EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
156 void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
158 struct ipv6_pinfo *np = inet6_sk(sk);
159 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
161 sin6->sin6_family = AF_INET6;
162 ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
163 sin6->sin6_port = inet_sk(sk)->inet_dport;
164 /* We do not store received flowlabel for TCP */
165 sin6->sin6_flowinfo = 0;
166 sin6->sin6_scope_id = 0;
167 if (sk->sk_bound_dev_if &&
168 ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
169 sin6->sin6_scope_id = sk->sk_bound_dev_if;
172 EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
175 void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
176 struct in6_addr *daddr, struct in6_addr *saddr)
178 __ip6_dst_store(sk, dst, daddr, saddr);
182 struct rt6_info *rt = (struct rt6_info *)dst;
183 rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid);
189 struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
191 struct dst_entry *dst;
193 dst = __sk_dst_check(sk, cookie);
197 struct rt6_info *rt = (struct rt6_info *)dst;
198 if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
208 int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
210 struct sock *sk = skb->sk;
211 struct inet_sock *inet = inet_sk(sk);
212 struct ipv6_pinfo *np = inet6_sk(sk);
214 struct dst_entry *dst;
215 struct in6_addr *final_p, final;
218 memset(&fl6, 0, sizeof(fl6));
219 fl6.flowi6_proto = sk->sk_protocol;
220 ipv6_addr_copy(&fl6.daddr, &np->daddr);
221 ipv6_addr_copy(&fl6.saddr, &np->saddr);
222 fl6.flowlabel = np->flow_label;
223 IP6_ECN_flow_xmit(sk, fl6.flowlabel);
224 fl6.flowi6_oif = sk->sk_bound_dev_if;
225 fl6.flowi6_mark = sk->sk_mark;
226 fl6.fl6_sport = inet->inet_sport;
227 fl6.fl6_dport = inet->inet_dport;
228 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
231 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
234 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
237 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
240 sk->sk_err_soft = -PTR_ERR(dst);
241 sk->sk_route_caps = 0;
246 __inet6_csk_dst_store(sk, dst, NULL, NULL);
250 skb_dst_set_noref(skb, dst);
252 /* Restore final destination back after routing done */
253 ipv6_addr_copy(&fl6.daddr, &np->daddr);
255 res = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt),
260 EXPORT_SYMBOL_GPL(inet6_csk_xmit);