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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 | 30 | int inet6_csk_bind_conflict(const struct sock *sk, |
aacd9289 | 31 | const struct inet_bind_bucket *tb, bool relax) |
b9750ce1 ACM |
32 | { |
33 | const struct sock *sk2; | |
5ba24953 TH |
34 | int reuse = sk->sk_reuse; |
35 | int reuseport = sk->sk_reuseport; | |
243bb4c6 | 36 | kuid_t uid = sock_i_uid((struct sock *)sk); |
b9750ce1 ACM |
37 | |
38 | /* We must walk the whole port owner list in this case. -DaveM */ | |
7477fd2e PE |
39 | /* |
40 | * See comment in inet_csk_bind_conflict about sock lookup | |
41 | * vs net namespaces issues. | |
42 | */ | |
b67bfe0d | 43 | sk_for_each_bound(sk2, &tb->owners) { |
b9750ce1 ACM |
44 | if (sk != sk2 && |
45 | (!sk->sk_bound_dev_if || | |
46 | !sk2->sk_bound_dev_if || | |
5ba24953 TH |
47 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { |
48 | if ((!reuse || !sk2->sk_reuse || | |
49 | sk2->sk_state == TCP_LISTEN) && | |
50 | (!reuseport || !sk2->sk_reuseport || | |
51 | (sk2->sk_state != TCP_TIME_WAIT && | |
52 | !uid_eq(uid, | |
53 | sock_i_uid((struct sock *)sk2))))) { | |
54 | if (ipv6_rcv_saddr_equal(sk, sk2)) | |
55 | break; | |
56 | } | |
57 | } | |
b9750ce1 ACM |
58 | } |
59 | ||
b67bfe0d | 60 | return sk2 != NULL; |
b9750ce1 ACM |
61 | } |
62 | ||
63 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); | |
64 | ||
ae4694b2 | 65 | struct dst_entry *inet6_csk_route_req(struct sock *sk, |
3840a06e | 66 | struct flowi6 *fl6, |
ae4694b2 DM |
67 | const struct request_sock *req) |
68 | { | |
69 | struct inet6_request_sock *treq = inet6_rsk(req); | |
70 | struct ipv6_pinfo *np = inet6_sk(sk); | |
71 | struct in6_addr *final_p, final; | |
72 | struct dst_entry *dst; | |
4c9483b2 | 73 | |
3840a06e NC |
74 | memset(fl6, 0, sizeof(*fl6)); |
75 | fl6->flowi6_proto = IPPROTO_TCP; | |
76 | fl6->daddr = treq->rmt_addr; | |
77 | final_p = fl6_update_dst(fl6, np->opt, &final); | |
78 | fl6->saddr = treq->loc_addr; | |
79 | fl6->flowi6_oif = treq->iif; | |
80 | fl6->flowi6_mark = sk->sk_mark; | |
81 | fl6->fl6_dport = inet_rsk(req)->rmt_port; | |
82 | fl6->fl6_sport = inet_rsk(req)->loc_port; | |
83 | security_req_classify_flow(req, flowi6_to_flowi(fl6)); | |
4c9483b2 | 84 | |
3840a06e | 85 | dst = ip6_dst_lookup_flow(sk, fl6, final_p, false); |
68d0c6d3 | 86 | if (IS_ERR(dst)) |
ae4694b2 DM |
87 | return NULL; |
88 | ||
89 | return dst; | |
90 | } | |
91 | ||
8129765a ACM |
92 | /* |
93 | * request_sock (formerly open request) hash tables. | |
94 | */ | |
fede70b9 | 95 | static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, |
c16a98ed | 96 | const u32 rnd, const u32 synq_hsize) |
8129765a | 97 | { |
82a39eb6 | 98 | u32 c; |
8129765a | 99 | |
82a39eb6 JK |
100 | c = jhash_3words((__force u32)raddr->s6_addr32[0], |
101 | (__force u32)raddr->s6_addr32[1], | |
102 | (__force u32)raddr->s6_addr32[2], | |
103 | rnd); | |
8129765a | 104 | |
82a39eb6 JK |
105 | c = jhash_2words((__force u32)raddr->s6_addr32[3], |
106 | (__force u32)rport, | |
107 | c); | |
8129765a ACM |
108 | |
109 | return c & (synq_hsize - 1); | |
110 | } | |
111 | ||
112 | struct request_sock *inet6_csk_search_req(const struct sock *sk, | |
113 | struct request_sock ***prevp, | |
fede70b9 | 114 | const __be16 rport, |
8129765a ACM |
115 | const struct in6_addr *raddr, |
116 | const struct in6_addr *laddr, | |
117 | const int iif) | |
118 | { | |
119 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
120 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
121 | struct request_sock *req, **prev; | |
122 | ||
123 | for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, | |
124 | lopt->hash_rnd, | |
125 | lopt->nr_table_entries)]; | |
126 | (req = *prev) != NULL; | |
127 | prev = &req->dl_next) { | |
ca304b61 | 128 | const struct inet6_request_sock *treq = inet6_rsk(req); |
8129765a ACM |
129 | |
130 | if (inet_rsk(req)->rmt_port == rport && | |
131 | req->rsk_ops->family == AF_INET6 && | |
132 | ipv6_addr_equal(&treq->rmt_addr, raddr) && | |
133 | ipv6_addr_equal(&treq->loc_addr, laddr) && | |
134 | (!treq->iif || treq->iif == iif)) { | |
547b792c | 135 | WARN_ON(req->sk != NULL); |
8129765a ACM |
136 | *prevp = prev; |
137 | return req; | |
138 | } | |
139 | } | |
140 | ||
141 | return NULL; | |
142 | } | |
143 | ||
144 | EXPORT_SYMBOL_GPL(inet6_csk_search_req); | |
145 | ||
146 | void inet6_csk_reqsk_queue_hash_add(struct sock *sk, | |
147 | struct request_sock *req, | |
148 | const unsigned long timeout) | |
149 | { | |
150 | struct inet_connection_sock *icsk = inet_csk(sk); | |
151 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
ca304b61 | 152 | const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr, |
8129765a ACM |
153 | inet_rsk(req)->rmt_port, |
154 | lopt->hash_rnd, lopt->nr_table_entries); | |
155 | ||
156 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); | |
157 | inet_csk_reqsk_queue_added(sk, timeout); | |
158 | } | |
159 | ||
160 | EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); | |
b9750ce1 ACM |
161 | |
162 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
163 | { | |
164 | struct ipv6_pinfo *np = inet6_sk(sk); | |
165 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
166 | ||
167 | sin6->sin6_family = AF_INET6; | |
4e3fd7a0 | 168 | sin6->sin6_addr = np->daddr; |
c720c7e8 | 169 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
b9750ce1 ACM |
170 | /* We do not store received flowlabel for TCP */ |
171 | sin6->sin6_flowinfo = 0; | |
172 | sin6->sin6_scope_id = 0; | |
173 | if (sk->sk_bound_dev_if && | |
174 | ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
175 | sin6->sin6_scope_id = sk->sk_bound_dev_if; | |
176 | } | |
177 | ||
178 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); | |
179 | ||
a47ed4cd NT |
180 | static inline |
181 | void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, | |
d3818c92 ED |
182 | const struct in6_addr *daddr, |
183 | const struct in6_addr *saddr) | |
a47ed4cd NT |
184 | { |
185 | __ip6_dst_store(sk, dst, daddr, saddr); | |
a47ed4cd NT |
186 | } |
187 | ||
188 | static inline | |
189 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
190 | { | |
6f3118b5 | 191 | return __sk_dst_check(sk, cookie); |
a47ed4cd NT |
192 | } |
193 | ||
d3818c92 ED |
194 | static struct dst_entry *inet6_csk_route_socket(struct sock *sk, |
195 | struct flowi6 *fl6) | |
b9750ce1 | 196 | { |
b9750ce1 ACM |
197 | struct inet_sock *inet = inet_sk(sk); |
198 | struct ipv6_pinfo *np = inet6_sk(sk); | |
20c59de2 | 199 | struct in6_addr *final_p, final; |
35ad9b9c | 200 | struct dst_entry *dst; |
b9750ce1 | 201 | |
d3818c92 ED |
202 | memset(fl6, 0, sizeof(*fl6)); |
203 | fl6->flowi6_proto = sk->sk_protocol; | |
204 | fl6->daddr = np->daddr; | |
205 | fl6->saddr = np->saddr; | |
206 | fl6->flowlabel = np->flow_label; | |
207 | IP6_ECN_flow_xmit(sk, fl6->flowlabel); | |
208 | fl6->flowi6_oif = sk->sk_bound_dev_if; | |
209 | fl6->flowi6_mark = sk->sk_mark; | |
210 | fl6->fl6_sport = inet->inet_sport; | |
211 | fl6->fl6_dport = inet->inet_dport; | |
212 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); | |
b9750ce1 | 213 | |
d3818c92 | 214 | final_p = fl6_update_dst(fl6, np->opt, &final); |
b9750ce1 | 215 | |
a47ed4cd | 216 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
35ad9b9c | 217 | if (!dst) { |
d3818c92 | 218 | dst = ip6_dst_lookup_flow(sk, fl6, final_p, false); |
b9750ce1 | 219 | |
35ad9b9c DM |
220 | if (!IS_ERR(dst)) |
221 | __inet6_csk_dst_store(sk, dst, NULL, NULL); | |
222 | } | |
223 | return dst; | |
224 | } | |
b9750ce1 | 225 | |
35ad9b9c DM |
226 | int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused) |
227 | { | |
228 | struct sock *sk = skb->sk; | |
229 | struct ipv6_pinfo *np = inet6_sk(sk); | |
230 | struct flowi6 fl6; | |
231 | struct dst_entry *dst; | |
232 | int res; | |
233 | ||
d3818c92 | 234 | dst = inet6_csk_route_socket(sk, &fl6); |
35ad9b9c DM |
235 | if (IS_ERR(dst)) { |
236 | sk->sk_err_soft = -PTR_ERR(dst); | |
237 | sk->sk_route_caps = 0; | |
238 | kfree_skb(skb); | |
239 | return PTR_ERR(dst); | |
b9750ce1 ACM |
240 | } |
241 | ||
d14730b8 ED |
242 | rcu_read_lock(); |
243 | skb_dst_set_noref(skb, dst); | |
b9750ce1 ACM |
244 | |
245 | /* Restore final destination back after routing done */ | |
4e3fd7a0 | 246 | fl6.daddr = np->daddr; |
b9750ce1 | 247 | |
b903d324 | 248 | res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass); |
d14730b8 ED |
249 | rcu_read_unlock(); |
250 | return res; | |
b9750ce1 | 251 | } |
b9750ce1 | 252 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |
35ad9b9c DM |
253 | |
254 | struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu) | |
255 | { | |
d3818c92 ED |
256 | struct flowi6 fl6; |
257 | struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6); | |
35ad9b9c DM |
258 | |
259 | if (IS_ERR(dst)) | |
260 | return NULL; | |
6700c270 | 261 | dst->ops->update_pmtu(dst, sk, NULL, mtu); |
35ad9b9c | 262 | |
b4dd0067 ED |
263 | dst = inet6_csk_route_socket(sk, &fl6); |
264 | return IS_ERR(dst) ? NULL : dst; | |
35ad9b9c DM |
265 | } |
266 | EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu); |