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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 || | |
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)) | |
49 | break; | |
50 | } | |
51 | ||
52 | return node != NULL; | |
53 | } | |
54 | ||
55 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); | |
56 | ||
8129765a ACM |
57 | /* |
58 | * request_sock (formerly open request) hash tables. | |
59 | */ | |
fede70b9 | 60 | static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, |
8129765a ACM |
61 | const u32 rnd, const u16 synq_hsize) |
62 | { | |
e69a4adc AV |
63 | u32 a = (__force u32)raddr->s6_addr32[0]; |
64 | u32 b = (__force u32)raddr->s6_addr32[1]; | |
65 | u32 c = (__force u32)raddr->s6_addr32[2]; | |
8129765a ACM |
66 | |
67 | a += JHASH_GOLDEN_RATIO; | |
68 | b += JHASH_GOLDEN_RATIO; | |
69 | c += rnd; | |
70 | __jhash_mix(a, b, c); | |
71 | ||
e69a4adc | 72 | a += (__force u32)raddr->s6_addr32[3]; |
fede70b9 | 73 | b += (__force u32)rport; |
8129765a ACM |
74 | __jhash_mix(a, b, c); |
75 | ||
76 | return c & (synq_hsize - 1); | |
77 | } | |
78 | ||
79 | struct request_sock *inet6_csk_search_req(const struct sock *sk, | |
80 | struct request_sock ***prevp, | |
fede70b9 | 81 | const __be16 rport, |
8129765a ACM |
82 | const struct in6_addr *raddr, |
83 | const struct in6_addr *laddr, | |
84 | const int iif) | |
85 | { | |
86 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
87 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
88 | struct request_sock *req, **prev; | |
89 | ||
90 | for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, | |
91 | lopt->hash_rnd, | |
92 | lopt->nr_table_entries)]; | |
93 | (req = *prev) != NULL; | |
94 | prev = &req->dl_next) { | |
ca304b61 | 95 | const struct inet6_request_sock *treq = inet6_rsk(req); |
8129765a ACM |
96 | |
97 | if (inet_rsk(req)->rmt_port == rport && | |
98 | req->rsk_ops->family == AF_INET6 && | |
99 | ipv6_addr_equal(&treq->rmt_addr, raddr) && | |
100 | ipv6_addr_equal(&treq->loc_addr, laddr) && | |
101 | (!treq->iif || treq->iif == iif)) { | |
547b792c | 102 | WARN_ON(req->sk != NULL); |
8129765a ACM |
103 | *prevp = prev; |
104 | return req; | |
105 | } | |
106 | } | |
107 | ||
108 | return NULL; | |
109 | } | |
110 | ||
111 | EXPORT_SYMBOL_GPL(inet6_csk_search_req); | |
112 | ||
113 | void inet6_csk_reqsk_queue_hash_add(struct sock *sk, | |
114 | struct request_sock *req, | |
115 | const unsigned long timeout) | |
116 | { | |
117 | struct inet_connection_sock *icsk = inet_csk(sk); | |
118 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
ca304b61 | 119 | const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, |
8129765a ACM |
120 | inet_rsk(req)->rmt_port, |
121 | lopt->hash_rnd, lopt->nr_table_entries); | |
122 | ||
123 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); | |
124 | inet_csk_reqsk_queue_added(sk, timeout); | |
125 | } | |
126 | ||
127 | EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); | |
b9750ce1 ACM |
128 | |
129 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
130 | { | |
131 | struct ipv6_pinfo *np = inet6_sk(sk); | |
132 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
133 | ||
134 | sin6->sin6_family = AF_INET6; | |
135 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); | |
c720c7e8 | 136 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
b9750ce1 ACM |
137 | /* We do not store received flowlabel for TCP */ |
138 | sin6->sin6_flowinfo = 0; | |
139 | sin6->sin6_scope_id = 0; | |
140 | if (sk->sk_bound_dev_if && | |
141 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
142 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
143 | } | |
144 | ||
145 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); | |
146 | ||
a47ed4cd NT |
147 | static inline |
148 | void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, | |
149 | struct in6_addr *daddr, struct in6_addr *saddr) | |
150 | { | |
151 | __ip6_dst_store(sk, dst, daddr, saddr); | |
152 | ||
153 | #ifdef CONFIG_XFRM | |
1dff92e0 | 154 | { |
a47ed4cd NT |
155 | struct rt6_info *rt = (struct rt6_info *)dst; |
156 | rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid); | |
157 | } | |
158 | #endif | |
159 | } | |
160 | ||
161 | static inline | |
162 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
163 | { | |
164 | struct dst_entry *dst; | |
165 | ||
166 | dst = __sk_dst_check(sk, cookie); | |
167 | ||
168 | #ifdef CONFIG_XFRM | |
169 | if (dst) { | |
170 | struct rt6_info *rt = (struct rt6_info *)dst; | |
171 | if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) { | |
f04c8276 | 172 | __sk_dst_reset(sk); |
a47ed4cd NT |
173 | dst = NULL; |
174 | } | |
175 | } | |
176 | #endif | |
177 | ||
178 | return dst; | |
179 | } | |
180 | ||
4e15ed4d | 181 | int inet6_csk_xmit(struct sk_buff *skb) |
b9750ce1 | 182 | { |
e89862f4 | 183 | struct sock *sk = skb->sk; |
b9750ce1 ACM |
184 | struct inet_sock *inet = inet_sk(sk); |
185 | struct ipv6_pinfo *np = inet6_sk(sk); | |
186 | struct flowi fl; | |
187 | struct dst_entry *dst; | |
188 | struct in6_addr *final_p = NULL, final; | |
189 | ||
190 | memset(&fl, 0, sizeof(fl)); | |
191 | fl.proto = sk->sk_protocol; | |
192 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
193 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
194 | fl.fl6_flowlabel = np->flow_label; | |
195 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
196 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 197 | fl.mark = sk->sk_mark; |
c720c7e8 ED |
198 | fl.fl_ip_sport = inet->inet_sport; |
199 | fl.fl_ip_dport = inet->inet_dport; | |
beb8d13b | 200 | security_sk_classify_flow(sk, &fl); |
b9750ce1 ACM |
201 | |
202 | if (np->opt && np->opt->srcrt) { | |
203 | struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; | |
204 | ipv6_addr_copy(&final, &fl.fl6_dst); | |
205 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
206 | final_p = &final; | |
207 | } | |
208 | ||
a47ed4cd | 209 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
b9750ce1 ACM |
210 | |
211 | if (dst == NULL) { | |
212 | int err = ip6_dst_lookup(sk, &dst, &fl); | |
213 | ||
214 | if (err) { | |
215 | sk->sk_err_soft = -err; | |
b0013fd4 | 216 | kfree_skb(skb); |
b9750ce1 ACM |
217 | return err; |
218 | } | |
219 | ||
220 | if (final_p) | |
221 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
222 | ||
52479b62 | 223 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { |
b9750ce1 | 224 | sk->sk_route_caps = 0; |
b0013fd4 | 225 | kfree_skb(skb); |
b9750ce1 ACM |
226 | return err; |
227 | } | |
228 | ||
a47ed4cd | 229 | __inet6_csk_dst_store(sk, dst, NULL, NULL); |
b9750ce1 ACM |
230 | } |
231 | ||
adf30907 | 232 | skb_dst_set(skb, dst_clone(dst)); |
b9750ce1 ACM |
233 | |
234 | /* Restore final destination back after routing done */ | |
235 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
236 | ||
4e15ed4d | 237 | return ip6_xmit(sk, skb, &fl, np->opt); |
b9750ce1 ACM |
238 | } |
239 | ||
240 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |