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