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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 || | |
8d238b25 DM |
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; | |
b9750ce1 ACM |
50 | } |
51 | ||
52 | return node != NULL; | |
53 | } | |
54 | ||
55 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); | |
56 | ||
ae4694b2 DM |
57 | struct dst_entry *inet6_csk_route_req(struct sock *sk, |
58 | const struct request_sock *req) | |
59 | { | |
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; | |
64 | struct flowi fl; | |
65 | ||
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); | |
76 | ||
77 | if (ip6_dst_lookup(sk, &dst, &fl)) | |
78 | return NULL; | |
79 | ||
80 | if (final_p) | |
81 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
82 | ||
83 | if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) | |
84 | return NULL; | |
85 | ||
86 | return dst; | |
87 | } | |
88 | ||
8129765a ACM |
89 | /* |
90 | * request_sock (formerly open request) hash tables. | |
91 | */ | |
fede70b9 | 92 | static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, |
8129765a ACM |
93 | const u32 rnd, const u16 synq_hsize) |
94 | { | |
82a39eb6 | 95 | u32 c; |
8129765a | 96 | |
82a39eb6 JK |
97 | c = jhash_3words((__force u32)raddr->s6_addr32[0], |
98 | (__force u32)raddr->s6_addr32[1], | |
99 | (__force u32)raddr->s6_addr32[2], | |
100 | rnd); | |
8129765a | 101 | |
82a39eb6 JK |
102 | c = jhash_2words((__force u32)raddr->s6_addr32[3], |
103 | (__force u32)rport, | |
104 | c); | |
8129765a ACM |
105 | |
106 | return c & (synq_hsize - 1); | |
107 | } | |
108 | ||
109 | struct request_sock *inet6_csk_search_req(const struct sock *sk, | |
110 | struct request_sock ***prevp, | |
fede70b9 | 111 | const __be16 rport, |
8129765a ACM |
112 | const struct in6_addr *raddr, |
113 | const struct in6_addr *laddr, | |
114 | const int iif) | |
115 | { | |
116 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
117 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
118 | struct request_sock *req, **prev; | |
119 | ||
120 | for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, | |
121 | lopt->hash_rnd, | |
122 | lopt->nr_table_entries)]; | |
123 | (req = *prev) != NULL; | |
124 | prev = &req->dl_next) { | |
ca304b61 | 125 | const struct inet6_request_sock *treq = inet6_rsk(req); |
8129765a ACM |
126 | |
127 | if (inet_rsk(req)->rmt_port == rport && | |
128 | req->rsk_ops->family == AF_INET6 && | |
129 | ipv6_addr_equal(&treq->rmt_addr, raddr) && | |
130 | ipv6_addr_equal(&treq->loc_addr, laddr) && | |
131 | (!treq->iif || treq->iif == iif)) { | |
547b792c | 132 | WARN_ON(req->sk != NULL); |
8129765a ACM |
133 | *prevp = prev; |
134 | return req; | |
135 | } | |
136 | } | |
137 | ||
138 | return NULL; | |
139 | } | |
140 | ||
141 | EXPORT_SYMBOL_GPL(inet6_csk_search_req); | |
142 | ||
143 | void inet6_csk_reqsk_queue_hash_add(struct sock *sk, | |
144 | struct request_sock *req, | |
145 | const unsigned long timeout) | |
146 | { | |
147 | struct inet_connection_sock *icsk = inet_csk(sk); | |
148 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
ca304b61 | 149 | const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, |
8129765a ACM |
150 | inet_rsk(req)->rmt_port, |
151 | lopt->hash_rnd, lopt->nr_table_entries); | |
152 | ||
153 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); | |
154 | inet_csk_reqsk_queue_added(sk, timeout); | |
155 | } | |
156 | ||
157 | EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); | |
b9750ce1 ACM |
158 | |
159 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
160 | { | |
161 | struct ipv6_pinfo *np = inet6_sk(sk); | |
162 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
163 | ||
164 | sin6->sin6_family = AF_INET6; | |
165 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); | |
c720c7e8 | 166 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
b9750ce1 ACM |
167 | /* We do not store received flowlabel for TCP */ |
168 | sin6->sin6_flowinfo = 0; | |
169 | sin6->sin6_scope_id = 0; | |
170 | if (sk->sk_bound_dev_if && | |
171 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
172 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
173 | } | |
174 | ||
175 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); | |
176 | ||
a47ed4cd NT |
177 | static inline |
178 | void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, | |
179 | struct in6_addr *daddr, struct in6_addr *saddr) | |
180 | { | |
181 | __ip6_dst_store(sk, dst, daddr, saddr); | |
182 | ||
183 | #ifdef CONFIG_XFRM | |
1dff92e0 | 184 | { |
a47ed4cd NT |
185 | struct rt6_info *rt = (struct rt6_info *)dst; |
186 | rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid); | |
187 | } | |
188 | #endif | |
189 | } | |
190 | ||
191 | static inline | |
192 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
193 | { | |
194 | struct dst_entry *dst; | |
195 | ||
196 | dst = __sk_dst_check(sk, cookie); | |
197 | ||
198 | #ifdef CONFIG_XFRM | |
199 | if (dst) { | |
200 | struct rt6_info *rt = (struct rt6_info *)dst; | |
201 | if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) { | |
f04c8276 | 202 | __sk_dst_reset(sk); |
a47ed4cd NT |
203 | dst = NULL; |
204 | } | |
205 | } | |
206 | #endif | |
207 | ||
208 | return dst; | |
209 | } | |
210 | ||
4e15ed4d | 211 | int inet6_csk_xmit(struct sk_buff *skb) |
b9750ce1 | 212 | { |
e89862f4 | 213 | struct sock *sk = skb->sk; |
b9750ce1 ACM |
214 | struct inet_sock *inet = inet_sk(sk); |
215 | struct ipv6_pinfo *np = inet6_sk(sk); | |
216 | struct flowi fl; | |
217 | struct dst_entry *dst; | |
20c59de2 | 218 | struct in6_addr *final_p, final; |
b9750ce1 ACM |
219 | |
220 | memset(&fl, 0, sizeof(fl)); | |
221 | fl.proto = sk->sk_protocol; | |
222 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
223 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
224 | fl.fl6_flowlabel = np->flow_label; | |
225 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
226 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 227 | fl.mark = sk->sk_mark; |
c720c7e8 ED |
228 | fl.fl_ip_sport = inet->inet_sport; |
229 | fl.fl_ip_dport = inet->inet_dport; | |
beb8d13b | 230 | security_sk_classify_flow(sk, &fl); |
b9750ce1 | 231 | |
20c59de2 | 232 | final_p = fl6_update_dst(&fl, np->opt, &final); |
b9750ce1 | 233 | |
a47ed4cd | 234 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
b9750ce1 ACM |
235 | |
236 | if (dst == NULL) { | |
237 | int err = ip6_dst_lookup(sk, &dst, &fl); | |
238 | ||
239 | if (err) { | |
240 | sk->sk_err_soft = -err; | |
b0013fd4 | 241 | kfree_skb(skb); |
b9750ce1 ACM |
242 | return err; |
243 | } | |
244 | ||
245 | if (final_p) | |
246 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
247 | ||
52479b62 | 248 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { |
b9750ce1 | 249 | sk->sk_route_caps = 0; |
b0013fd4 | 250 | kfree_skb(skb); |
b9750ce1 ACM |
251 | return err; |
252 | } | |
253 | ||
a47ed4cd | 254 | __inet6_csk_dst_store(sk, dst, NULL, NULL); |
b9750ce1 ACM |
255 | } |
256 | ||
adf30907 | 257 | skb_dst_set(skb, dst_clone(dst)); |
b9750ce1 ACM |
258 | |
259 | /* Restore final destination back after routing done */ | |
260 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
261 | ||
4e15ed4d | 262 | return ip6_xmit(sk, skb, &fl, np->opt); |
b9750ce1 ACM |
263 | } |
264 | ||
265 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |