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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 | ||
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 | { | |
82a39eb6 | 63 | u32 c; |
8129765a | 64 | |
82a39eb6 JK |
65 | c = jhash_3words((__force u32)raddr->s6_addr32[0], |
66 | (__force u32)raddr->s6_addr32[1], | |
67 | (__force u32)raddr->s6_addr32[2], | |
68 | rnd); | |
8129765a | 69 | |
82a39eb6 JK |
70 | c = jhash_2words((__force u32)raddr->s6_addr32[3], |
71 | (__force u32)rport, | |
72 | c); | |
8129765a ACM |
73 | |
74 | return c & (synq_hsize - 1); | |
75 | } | |
76 | ||
77 | struct request_sock *inet6_csk_search_req(const struct sock *sk, | |
78 | struct request_sock ***prevp, | |
fede70b9 | 79 | const __be16 rport, |
8129765a ACM |
80 | const struct in6_addr *raddr, |
81 | const struct in6_addr *laddr, | |
82 | const int iif) | |
83 | { | |
84 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
85 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
86 | struct request_sock *req, **prev; | |
87 | ||
88 | for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, | |
89 | lopt->hash_rnd, | |
90 | lopt->nr_table_entries)]; | |
91 | (req = *prev) != NULL; | |
92 | prev = &req->dl_next) { | |
ca304b61 | 93 | const struct inet6_request_sock *treq = inet6_rsk(req); |
8129765a ACM |
94 | |
95 | if (inet_rsk(req)->rmt_port == rport && | |
96 | req->rsk_ops->family == AF_INET6 && | |
97 | ipv6_addr_equal(&treq->rmt_addr, raddr) && | |
98 | ipv6_addr_equal(&treq->loc_addr, laddr) && | |
99 | (!treq->iif || treq->iif == iif)) { | |
547b792c | 100 | WARN_ON(req->sk != NULL); |
8129765a ACM |
101 | *prevp = prev; |
102 | return req; | |
103 | } | |
104 | } | |
105 | ||
106 | return NULL; | |
107 | } | |
108 | ||
109 | EXPORT_SYMBOL_GPL(inet6_csk_search_req); | |
110 | ||
111 | void inet6_csk_reqsk_queue_hash_add(struct sock *sk, | |
112 | struct request_sock *req, | |
113 | const unsigned long timeout) | |
114 | { | |
115 | struct inet_connection_sock *icsk = inet_csk(sk); | |
116 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
ca304b61 | 117 | const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, |
8129765a ACM |
118 | inet_rsk(req)->rmt_port, |
119 | lopt->hash_rnd, lopt->nr_table_entries); | |
120 | ||
121 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); | |
122 | inet_csk_reqsk_queue_added(sk, timeout); | |
123 | } | |
124 | ||
125 | EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); | |
b9750ce1 ACM |
126 | |
127 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
128 | { | |
129 | struct ipv6_pinfo *np = inet6_sk(sk); | |
130 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
131 | ||
132 | sin6->sin6_family = AF_INET6; | |
133 | ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); | |
c720c7e8 | 134 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
b9750ce1 ACM |
135 | /* We do not store received flowlabel for TCP */ |
136 | sin6->sin6_flowinfo = 0; | |
137 | sin6->sin6_scope_id = 0; | |
138 | if (sk->sk_bound_dev_if && | |
139 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
140 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
141 | } | |
142 | ||
143 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); | |
144 | ||
a47ed4cd NT |
145 | static inline |
146 | void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, | |
147 | struct in6_addr *daddr, struct in6_addr *saddr) | |
148 | { | |
149 | __ip6_dst_store(sk, dst, daddr, saddr); | |
150 | ||
151 | #ifdef CONFIG_XFRM | |
1dff92e0 | 152 | { |
a47ed4cd NT |
153 | struct rt6_info *rt = (struct rt6_info *)dst; |
154 | rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid); | |
155 | } | |
156 | #endif | |
157 | } | |
158 | ||
159 | static inline | |
160 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
161 | { | |
162 | struct dst_entry *dst; | |
163 | ||
164 | dst = __sk_dst_check(sk, cookie); | |
165 | ||
166 | #ifdef CONFIG_XFRM | |
167 | if (dst) { | |
168 | struct rt6_info *rt = (struct rt6_info *)dst; | |
169 | if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) { | |
f04c8276 | 170 | __sk_dst_reset(sk); |
a47ed4cd NT |
171 | dst = NULL; |
172 | } | |
173 | } | |
174 | #endif | |
175 | ||
176 | return dst; | |
177 | } | |
178 | ||
4e15ed4d | 179 | int inet6_csk_xmit(struct sk_buff *skb) |
b9750ce1 | 180 | { |
e89862f4 | 181 | struct sock *sk = skb->sk; |
b9750ce1 ACM |
182 | struct inet_sock *inet = inet_sk(sk); |
183 | struct ipv6_pinfo *np = inet6_sk(sk); | |
184 | struct flowi fl; | |
185 | struct dst_entry *dst; | |
20c59de2 | 186 | struct in6_addr *final_p, final; |
b9750ce1 ACM |
187 | |
188 | memset(&fl, 0, sizeof(fl)); | |
189 | fl.proto = sk->sk_protocol; | |
190 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
191 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
192 | fl.fl6_flowlabel = np->flow_label; | |
193 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
194 | fl.oif = sk->sk_bound_dev_if; | |
51953d5b | 195 | fl.mark = sk->sk_mark; |
c720c7e8 ED |
196 | fl.fl_ip_sport = inet->inet_sport; |
197 | fl.fl_ip_dport = inet->inet_dport; | |
beb8d13b | 198 | security_sk_classify_flow(sk, &fl); |
b9750ce1 | 199 | |
20c59de2 | 200 | final_p = fl6_update_dst(&fl, np->opt, &final); |
b9750ce1 | 201 | |
a47ed4cd | 202 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
b9750ce1 ACM |
203 | |
204 | if (dst == NULL) { | |
205 | int err = ip6_dst_lookup(sk, &dst, &fl); | |
206 | ||
207 | if (err) { | |
208 | sk->sk_err_soft = -err; | |
b0013fd4 | 209 | kfree_skb(skb); |
b9750ce1 ACM |
210 | return err; |
211 | } | |
212 | ||
213 | if (final_p) | |
214 | ipv6_addr_copy(&fl.fl6_dst, final_p); | |
215 | ||
52479b62 | 216 | if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { |
b9750ce1 | 217 | sk->sk_route_caps = 0; |
b0013fd4 | 218 | kfree_skb(skb); |
b9750ce1 ACM |
219 | return err; |
220 | } | |
221 | ||
a47ed4cd | 222 | __inet6_csk_dst_store(sk, dst, NULL, NULL); |
b9750ce1 ACM |
223 | } |
224 | ||
adf30907 | 225 | skb_dst_set(skb, dst_clone(dst)); |
b9750ce1 ACM |
226 | |
227 | /* Restore final destination back after routing done */ | |
228 | ipv6_addr_copy(&fl.fl6_dst, &np->daddr); | |
229 | ||
4e15ed4d | 230 | return ip6_xmit(sk, skb, &fl, np->opt); |
b9750ce1 ACM |
231 | } |
232 | ||
233 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |