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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> | |
20 | ||
21 | #include <net/addrconf.h> | |
22 | #include <net/inet_connection_sock.h> | |
b9750ce1 ACM |
23 | #include <net/inet_ecn.h> |
24 | #include <net/inet_hashtables.h> | |
25 | #include <net/ip6_route.h> | |
8129765a | 26 | #include <net/sock.h> |
9f5336e2 | 27 | #include <net/inet6_connection_sock.h> |
8129765a | 28 | |
b9750ce1 ACM |
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 */ | |
7477fd2e PE |
36 | /* |
37 | * See comment in inet_csk_bind_conflict about sock lookup | |
38 | * vs net namespaces issues. | |
39 | */ | |
b9750ce1 ACM |
40 | sk_for_each_bound(sk2, node, &tb->owners) { |
41 | if (sk != sk2 && | |
42 | (!sk->sk_bound_dev_if || | |
43 | !sk2->sk_bound_dev_if || | |
44 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if) && | |
45 | (!sk->sk_reuse || !sk2->sk_reuse || | |
46 | sk2->sk_state == TCP_LISTEN) && | |
47 | ipv6_rcv_saddr_equal(sk, sk2)) | |
48 | break; | |
49 | } | |
50 | ||
51 | return node != NULL; | |
52 | } | |
53 | ||
54 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); | |
55 | ||
8129765a ACM |
56 | /* |
57 | * request_sock (formerly open request) hash tables. | |
58 | */ | |
fede70b9 | 59 | static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, |
8129765a ACM |
60 | const u32 rnd, const u16 synq_hsize) |
61 | { | |
e69a4adc AV |
62 | u32 a = (__force u32)raddr->s6_addr32[0]; |
63 | u32 b = (__force u32)raddr->s6_addr32[1]; | |
64 | u32 c = (__force u32)raddr->s6_addr32[2]; | |
8129765a ACM |
65 | |
66 | a += JHASH_GOLDEN_RATIO; | |
67 | b += JHASH_GOLDEN_RATIO; | |
68 | c += rnd; | |
69 | __jhash_mix(a, b, c); | |
70 | ||
e69a4adc | 71 | a += (__force u32)raddr->s6_addr32[3]; |
fede70b9 | 72 | b += (__force u32)rport; |
8129765a ACM |
73 | __jhash_mix(a, b, c); |
74 | ||
75 | return c & (synq_hsize - 1); | |
76 | } | |
77 | ||
78 | struct request_sock *inet6_csk_search_req(const struct sock *sk, | |
79 | struct request_sock ***prevp, | |
fede70b9 | 80 | const __be16 rport, |
8129765a ACM |
81 | const struct in6_addr *raddr, |
82 | const struct in6_addr *laddr, | |
83 | const int iif) | |
84 | { | |
85 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
86 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
87 | struct request_sock *req, **prev; | |
88 | ||
89 | for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, | |
90 | lopt->hash_rnd, | |
91 | lopt->nr_table_entries)]; | |
92 | (req = *prev) != NULL; | |
93 | prev = &req->dl_next) { | |
ca304b61 | 94 | const struct inet6_request_sock *treq = inet6_rsk(req); |
8129765a ACM |
95 | |
96 | if (inet_rsk(req)->rmt_port == rport && | |
97 | req->rsk_ops->family == AF_INET6 && | |
98 | ipv6_addr_equal(&treq->rmt_addr, raddr) && | |
99 | ipv6_addr_equal(&treq->loc_addr, laddr) && | |
100 | (!treq->iif || treq->iif == iif)) { | |
547b792c | 101 | WARN_ON(req->sk != NULL); |
8129765a ACM |
102 | *prevp = prev; |
103 | return req; | |
104 | } | |
105 | } | |
106 | ||
107 | return NULL; | |
108 | } | |
109 | ||
110 | EXPORT_SYMBOL_GPL(inet6_csk_search_req); | |
111 | ||
112 | void inet6_csk_reqsk_queue_hash_add(struct sock *sk, | |
113 | struct request_sock *req, | |
114 | const unsigned long timeout) | |
115 | { | |
116 | struct inet_connection_sock *icsk = inet_csk(sk); | |
117 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
ca304b61 | 118 | const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, |
8129765a ACM |
119 | inet_rsk(req)->rmt_port, |
120 | lopt->hash_rnd, lopt->nr_table_entries); | |
121 | ||
122 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); | |
123 | inet_csk_reqsk_queue_added(sk, timeout); | |
124 | } | |
125 | ||
126 | EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); | |
b9750ce1 ACM |
127 | |
128 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
129 | { | |
130 | struct ipv6_pinfo *np = inet6_sk(sk); | |
131 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
132 | ||
133 | sin6->sin6_family = AF_INET6; | |
134 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); | |
c720c7e8 | 135 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
b9750ce1 ACM |
136 | /* We do not store received flowlabel for TCP */ |
137 | sin6->sin6_flowinfo = 0; | |
138 | sin6->sin6_scope_id = 0; | |
139 | if (sk->sk_bound_dev_if && | |
140 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
141 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
142 | } | |
143 | ||
144 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); | |
145 | ||
a47ed4cd NT |
146 | static inline |
147 | void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, | |
148 | struct in6_addr *daddr, struct in6_addr *saddr) | |
149 | { | |
150 | __ip6_dst_store(sk, dst, daddr, saddr); | |
151 | ||
152 | #ifdef CONFIG_XFRM | |
1dff92e0 | 153 | { |
a47ed4cd NT |
154 | struct rt6_info *rt = (struct rt6_info *)dst; |
155 | rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid); | |
156 | } | |
157 | #endif | |
158 | } | |
159 | ||
160 | static inline | |
161 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
162 | { | |
163 | struct dst_entry *dst; | |
164 | ||
165 | dst = __sk_dst_check(sk, cookie); | |
166 | ||
167 | #ifdef CONFIG_XFRM | |
168 | if (dst) { | |
169 | struct rt6_info *rt = (struct rt6_info *)dst; | |
170 | if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) { | |
f04c8276 | 171 | __sk_dst_reset(sk); |
a47ed4cd NT |
172 | dst = NULL; |
173 | } | |
174 | } | |
175 | #endif | |
176 | ||
177 | return dst; | |
178 | } | |
179 | ||
e89862f4 | 180 | int inet6_csk_xmit(struct sk_buff *skb, int ipfragok) |
b9750ce1 | 181 | { |
e89862f4 | 182 | struct sock *sk = skb->sk; |
b9750ce1 ACM |
183 | struct inet_sock *inet = inet_sk(sk); |
184 | struct ipv6_pinfo *np = inet6_sk(sk); | |
185 | struct flowi fl; | |
186 | struct dst_entry *dst; | |
187 | struct in6_addr *final_p = NULL, final; | |
188 | ||
189 | memset(&fl, 0, sizeof(fl)); | |
190 | fl.proto = sk->sk_protocol; | |
191 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
192 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
193 | fl.fl6_flowlabel = np->flow_label; | |
194 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
195 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 196 | fl.mark = sk->sk_mark; |
c720c7e8 ED |
197 | fl.fl_ip_sport = inet->inet_sport; |
198 | fl.fl_ip_dport = inet->inet_dport; | |
beb8d13b | 199 | security_sk_classify_flow(sk, &fl); |
b9750ce1 ACM |
200 | |
201 | if (np->opt && np->opt->srcrt) { | |
202 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
203 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
204 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
205 | final_p = &final; | |
206 | } | |
207 | ||
a47ed4cd | 208 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
b9750ce1 ACM |
209 | |
210 | if (dst == NULL) { | |
211 | int err = ip6_dst_lookup(sk, &dst, &fl); | |
212 | ||
213 | if (err) { | |
214 | sk->sk_err_soft = -err; | |
b0013fd4 | 215 | kfree_skb(skb); |
b9750ce1 ACM |
216 | return err; |
217 | } | |
218 | ||
219 | if (final_p) | |
220 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
221 | ||
52479b62 | 222 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { |
b9750ce1 | 223 | sk->sk_route_caps = 0; |
b0013fd4 | 224 | kfree_skb(skb); |
b9750ce1 ACM |
225 | return err; |
226 | } | |
227 | ||
a47ed4cd | 228 | __inet6_csk_dst_store(sk, dst, NULL, NULL); |
b9750ce1 ACM |
229 | } |
230 | ||
adf30907 | 231 | skb_dst_set(skb, dst_clone(dst)); |
b9750ce1 ACM |
232 | |
233 | /* Restore final destination back after routing done */ | |
234 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
235 | ||
236 | return ip6_xmit(sk, skb, &fl, np->opt, 0); | |
237 | } | |
238 | ||
239 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |