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 ((1 << sk2->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))) &&
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(&fl, 0, sizeof(fl));
67 fl.proto = IPPROTO_TCP;
68 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
69 final_p = fl6_update_dst(&fl, np->opt, &final);
70 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
71 fl.oif = sk->sk_bound_dev_if;
72 fl.mark = sk->sk_mark;
73 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
74 fl.fl_ip_sport = inet_rsk(req)->loc_port;
75 security_req_classify_flow(req, &fl);
77 dst = ip6_dst_lookup_flow(sk, &fl, final_p, false);
85 * request_sock (formerly open request) hash tables.
87 static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
88 const u32 rnd, const u16 synq_hsize)
92 c = jhash_3words((__force u32)raddr->s6_addr32[0],
93 (__force u32)raddr->s6_addr32[1],
94 (__force u32)raddr->s6_addr32[2],
97 c = jhash_2words((__force u32)raddr->s6_addr32[3],
101 return c & (synq_hsize - 1);
104 struct request_sock *inet6_csk_search_req(const struct sock *sk,
105 struct request_sock ***prevp,
107 const struct in6_addr *raddr,
108 const struct in6_addr *laddr,
111 const struct inet_connection_sock *icsk = inet_csk(sk);
112 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
113 struct request_sock *req, **prev;
115 for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
117 lopt->nr_table_entries)];
118 (req = *prev) != NULL;
119 prev = &req->dl_next) {
120 const struct inet6_request_sock *treq = inet6_rsk(req);
122 if (inet_rsk(req)->rmt_port == rport &&
123 req->rsk_ops->family == AF_INET6 &&
124 ipv6_addr_equal(&treq->rmt_addr, raddr) &&
125 ipv6_addr_equal(&treq->loc_addr, laddr) &&
126 (!treq->iif || treq->iif == iif)) {
127 WARN_ON(req->sk != NULL);
136 EXPORT_SYMBOL_GPL(inet6_csk_search_req);
138 void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
139 struct request_sock *req,
140 const unsigned long timeout)
142 struct inet_connection_sock *icsk = inet_csk(sk);
143 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
144 const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
145 inet_rsk(req)->rmt_port,
146 lopt->hash_rnd, lopt->nr_table_entries);
148 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
149 inet_csk_reqsk_queue_added(sk, timeout);
152 EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
154 void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
156 struct ipv6_pinfo *np = inet6_sk(sk);
157 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
159 sin6->sin6_family = AF_INET6;
160 ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
161 sin6->sin6_port = inet_sk(sk)->inet_dport;
162 /* We do not store received flowlabel for TCP */
163 sin6->sin6_flowinfo = 0;
164 sin6->sin6_scope_id = 0;
165 if (sk->sk_bound_dev_if &&
166 ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
167 sin6->sin6_scope_id = sk->sk_bound_dev_if;
170 EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
173 void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
174 struct in6_addr *daddr, struct in6_addr *saddr)
176 __ip6_dst_store(sk, dst, daddr, saddr);
180 struct rt6_info *rt = (struct rt6_info *)dst;
181 rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid);
187 struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
189 struct dst_entry *dst;
191 dst = __sk_dst_check(sk, cookie);
195 struct rt6_info *rt = (struct rt6_info *)dst;
196 if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
206 int inet6_csk_xmit(struct sk_buff *skb)
208 struct sock *sk = skb->sk;
209 struct inet_sock *inet = inet_sk(sk);
210 struct ipv6_pinfo *np = inet6_sk(sk);
212 struct dst_entry *dst;
213 struct in6_addr *final_p, final;
215 memset(&fl, 0, sizeof(fl));
216 fl.proto = sk->sk_protocol;
217 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
218 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
219 fl.fl6_flowlabel = np->flow_label;
220 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
221 fl.oif = sk->sk_bound_dev_if;
222 fl.mark = sk->sk_mark;
223 fl.fl_ip_sport = inet->inet_sport;
224 fl.fl_ip_dport = inet->inet_dport;
225 security_sk_classify_flow(sk, &fl);
227 final_p = fl6_update_dst(&fl, np->opt, &final);
229 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
232 dst = ip6_dst_lookup_flow(sk, &fl, final_p, false);
235 sk->sk_err_soft = -PTR_ERR(dst);
236 sk->sk_route_caps = 0;
241 __inet6_csk_dst_store(sk, dst, NULL, NULL);
244 skb_dst_set(skb, dst_clone(dst));
246 /* Restore final destination back after routing done */
247 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
249 return ip6_xmit(sk, skb, &fl, np->opt);
252 EXPORT_SYMBOL_GPL(inet6_csk_xmit);