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8129765a ACM |
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 | ||
8129765a ACM |
16 | #include <linux/module.h> |
17 | #include <linux/in6.h> | |
18 | #include <linux/ipv6.h> | |
19 | #include <linux/jhash.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
8129765a ACM |
21 | |
22 | #include <net/addrconf.h> | |
23 | #include <net/inet_connection_sock.h> | |
b9750ce1 ACM |
24 | #include <net/inet_ecn.h> |
25 | #include <net/inet_hashtables.h> | |
26 | #include <net/ip6_route.h> | |
8129765a | 27 | #include <net/sock.h> |
9f5336e2 | 28 | #include <net/inet6_connection_sock.h> |
8129765a | 29 | |
b9750ce1 ACM |
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 */ | |
7477fd2e PE |
37 | /* |
38 | * See comment in inet_csk_bind_conflict about sock lookup | |
39 | * vs net namespaces issues. | |
40 | */ | |
b9750ce1 ACM |
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 || | |
fda48a0d ED |
45 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { |
46 | if ((!sk->sk_reuse || !sk2->sk_reuse || | |
47 | sk2->sk_state == TCP_LISTEN) && | |
48 | ipv6_rcv_saddr_equal(sk, sk2)) | |
49 | break; | |
50 | else if (sk->sk_reuse && sk2->sk_reuse && | |
6443bb1f | 51 | !ipv6_addr_any(inet6_rcv_saddr(sk)) && |
fda48a0d ED |
52 | ipv6_rcv_saddr_equal(sk, sk2)) |
53 | break; | |
54 | } | |
b9750ce1 ACM |
55 | } |
56 | ||
57 | return node != NULL; | |
58 | } | |
59 | ||
60 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); | |
61 | ||
8129765a ACM |
62 | /* |
63 | * request_sock (formerly open request) hash tables. | |
64 | */ | |
fede70b9 | 65 | static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, |
8129765a ACM |
66 | const u32 rnd, const u16 synq_hsize) |
67 | { | |
e69a4adc AV |
68 | u32 a = (__force u32)raddr->s6_addr32[0]; |
69 | u32 b = (__force u32)raddr->s6_addr32[1]; | |
70 | u32 c = (__force u32)raddr->s6_addr32[2]; | |
8129765a ACM |
71 | |
72 | a += JHASH_GOLDEN_RATIO; | |
73 | b += JHASH_GOLDEN_RATIO; | |
74 | c += rnd; | |
75 | __jhash_mix(a, b, c); | |
76 | ||
e69a4adc | 77 | a += (__force u32)raddr->s6_addr32[3]; |
fede70b9 | 78 | b += (__force u32)rport; |
8129765a ACM |
79 | __jhash_mix(a, b, c); |
80 | ||
81 | return c & (synq_hsize - 1); | |
82 | } | |
83 | ||
84 | struct request_sock *inet6_csk_search_req(const struct sock *sk, | |
85 | struct request_sock ***prevp, | |
fede70b9 | 86 | const __be16 rport, |
8129765a ACM |
87 | const struct in6_addr *raddr, |
88 | const struct in6_addr *laddr, | |
89 | const int iif) | |
90 | { | |
91 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
92 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
93 | struct request_sock *req, **prev; | |
94 | ||
95 | for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, | |
96 | lopt->hash_rnd, | |
97 | lopt->nr_table_entries)]; | |
98 | (req = *prev) != NULL; | |
99 | prev = &req->dl_next) { | |
ca304b61 | 100 | const struct inet6_request_sock *treq = inet6_rsk(req); |
8129765a ACM |
101 | |
102 | if (inet_rsk(req)->rmt_port == rport && | |
103 | req->rsk_ops->family == AF_INET6 && | |
104 | ipv6_addr_equal(&treq->rmt_addr, raddr) && | |
105 | ipv6_addr_equal(&treq->loc_addr, laddr) && | |
106 | (!treq->iif || treq->iif == iif)) { | |
547b792c | 107 | WARN_ON(req->sk != NULL); |
8129765a ACM |
108 | *prevp = prev; |
109 | return req; | |
110 | } | |
111 | } | |
112 | ||
113 | return NULL; | |
114 | } | |
115 | ||
116 | EXPORT_SYMBOL_GPL(inet6_csk_search_req); | |
117 | ||
118 | void inet6_csk_reqsk_queue_hash_add(struct sock *sk, | |
119 | struct request_sock *req, | |
120 | const unsigned long timeout) | |
121 | { | |
122 | struct inet_connection_sock *icsk = inet_csk(sk); | |
123 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
ca304b61 | 124 | const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, |
8129765a ACM |
125 | inet_rsk(req)->rmt_port, |
126 | lopt->hash_rnd, lopt->nr_table_entries); | |
127 | ||
128 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); | |
129 | inet_csk_reqsk_queue_added(sk, timeout); | |
130 | } | |
131 | ||
132 | EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); | |
b9750ce1 ACM |
133 | |
134 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
135 | { | |
136 | struct ipv6_pinfo *np = inet6_sk(sk); | |
137 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
138 | ||
139 | sin6->sin6_family = AF_INET6; | |
140 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); | |
c720c7e8 | 141 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
b9750ce1 ACM |
142 | /* We do not store received flowlabel for TCP */ |
143 | sin6->sin6_flowinfo = 0; | |
144 | sin6->sin6_scope_id = 0; | |
145 | if (sk->sk_bound_dev_if && | |
146 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
147 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
148 | } | |
149 | ||
150 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); | |
151 | ||
a47ed4cd NT |
152 | static inline |
153 | void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, | |
154 | struct in6_addr *daddr, struct in6_addr *saddr) | |
155 | { | |
156 | __ip6_dst_store(sk, dst, daddr, saddr); | |
157 | ||
158 | #ifdef CONFIG_XFRM | |
1dff92e0 | 159 | { |
a47ed4cd NT |
160 | struct rt6_info *rt = (struct rt6_info *)dst; |
161 | rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid); | |
162 | } | |
163 | #endif | |
164 | } | |
165 | ||
166 | static inline | |
167 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
168 | { | |
169 | struct dst_entry *dst; | |
170 | ||
171 | dst = __sk_dst_check(sk, cookie); | |
172 | ||
173 | #ifdef CONFIG_XFRM | |
174 | if (dst) { | |
175 | struct rt6_info *rt = (struct rt6_info *)dst; | |
176 | if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) { | |
f04c8276 | 177 | __sk_dst_reset(sk); |
a47ed4cd NT |
178 | dst = NULL; |
179 | } | |
180 | } | |
181 | #endif | |
182 | ||
183 | return dst; | |
184 | } | |
185 | ||
e89862f4 | 186 | int inet6_csk_xmit(struct sk_buff *skb, int ipfragok) |
b9750ce1 | 187 | { |
e89862f4 | 188 | struct sock *sk = skb->sk; |
b9750ce1 ACM |
189 | struct inet_sock *inet = inet_sk(sk); |
190 | struct ipv6_pinfo *np = inet6_sk(sk); | |
191 | struct flowi fl; | |
192 | struct dst_entry *dst; | |
193 | struct in6_addr *final_p = NULL, final; | |
194 | ||
195 | memset(&fl, 0, sizeof(fl)); | |
196 | fl.proto = sk->sk_protocol; | |
197 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
198 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
199 | fl.fl6_flowlabel = np->flow_label; | |
200 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
201 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 202 | fl.mark = sk->sk_mark; |
c720c7e8 ED |
203 | fl.fl_ip_sport = inet->inet_sport; |
204 | fl.fl_ip_dport = inet->inet_dport; | |
beb8d13b | 205 | security_sk_classify_flow(sk, &fl); |
b9750ce1 ACM |
206 | |
207 | if (np->opt && np->opt->srcrt) { | |
208 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
209 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
210 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
211 | final_p = &final; | |
212 | } | |
213 | ||
a47ed4cd | 214 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
b9750ce1 ACM |
215 | |
216 | if (dst == NULL) { | |
217 | int err = ip6_dst_lookup(sk, &dst, &fl); | |
218 | ||
219 | if (err) { | |
220 | sk->sk_err_soft = -err; | |
b0013fd4 | 221 | kfree_skb(skb); |
b9750ce1 ACM |
222 | return err; |
223 | } | |
224 | ||
225 | if (final_p) | |
226 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
227 | ||
52479b62 | 228 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { |
b9750ce1 | 229 | sk->sk_route_caps = 0; |
b0013fd4 | 230 | kfree_skb(skb); |
b9750ce1 ACM |
231 | return err; |
232 | } | |
233 | ||
a47ed4cd | 234 | __inet6_csk_dst_store(sk, dst, NULL, NULL); |
b9750ce1 ACM |
235 | } |
236 | ||
adf30907 | 237 | skb_dst_set(skb, dst_clone(dst)); |
b9750ce1 ACM |
238 | |
239 | /* Restore final destination back after routing done */ | |
240 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
241 | ||
242 | return ip6_xmit(sk, skb, &fl, np->opt, 0); | |
243 | } | |
244 | ||
245 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |