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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 | |
16 | #include <linux/module.h> |
17 | #include <linux/in6.h> |
18 | #include <linux/ipv6.h> |
19 | #include <linux/jhash.h> |
20 | #include <linux/slab.h> |
21 | |
22 | #include <net/addrconf.h> |
23 | #include <net/inet_connection_sock.h> |
24 | #include <net/inet_ecn.h> |
25 | #include <net/inet_hashtables.h> |
26 | #include <net/ip6_route.h> |
27 | #include <net/sock.h> |
28 | #include <net/inet6_connection_sock.h> |
29 | |
30 | int inet6_csk_bind_conflict(const struct sock *sk, |
31 | const struct inet_bind_bucket *tb, bool relax) |
32 | { |
33 | const struct sock *sk2; |
34 | int reuse = sk->sk_reuse; |
35 | int reuseport = sk->sk_reuseport; |
36 | kuid_t uid = sock_i_uid((struct sock *)sk); |
37 | |
38 | /* We must walk the whole port owner list in this case. -DaveM */ |
39 | /* |
40 | * See comment in inet_csk_bind_conflict about sock lookup |
41 | * vs net namespaces issues. |
42 | */ |
43 | sk_for_each_bound(sk2, &tb->owners) { |
44 | if (sk != sk2 && |
45 | (!sk->sk_bound_dev_if || |
46 | !sk2->sk_bound_dev_if || |
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 | if (!relax && reuse && sk2->sk_reuse && |
58 | sk2->sk_state != TCP_LISTEN && |
59 | ipv6_rcv_saddr_equal(sk, sk2)) |
60 | break; |
61 | } |
62 | } |
63 | |
64 | return sk2 != NULL; |
65 | } |
66 | |
67 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); |
68 | |
69 | struct dst_entry *inet6_csk_route_req(struct sock *sk, |
70 | struct flowi6 *fl6, |
71 | const struct request_sock *req) |
72 | { |
73 | struct inet_request_sock *ireq = inet_rsk(req); |
74 | struct ipv6_pinfo *np = inet6_sk(sk); |
75 | struct in6_addr *final_p, final; |
76 | struct dst_entry *dst; |
77 | |
78 | memset(fl6, 0, sizeof(*fl6)); |
79 | fl6->flowi6_proto = IPPROTO_TCP; |
80 | fl6->daddr = ireq->ir_v6_rmt_addr; |
81 | final_p = fl6_update_dst(fl6, np->opt, &final); |
82 | fl6->saddr = ireq->ir_v6_loc_addr; |
83 | fl6->flowi6_oif = ireq->ir_iif; |
84 | fl6->flowi6_mark = sk->sk_mark; |
85 | fl6->fl6_dport = ireq->ir_rmt_port; |
86 | fl6->fl6_sport = htons(ireq->ir_num); |
87 | security_req_classify_flow(req, flowi6_to_flowi(fl6)); |
88 | |
89 | dst = ip6_dst_lookup_flow(sk, fl6, final_p, false); |
90 | if (IS_ERR(dst)) |
91 | return NULL; |
92 | |
93 | return dst; |
94 | } |
95 | |
96 | /* |
97 | * request_sock (formerly open request) hash tables. |
98 | */ |
99 | static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, |
100 | const u32 rnd, const u32 synq_hsize) |
101 | { |
102 | u32 c; |
103 | |
104 | c = jhash_3words((__force u32)raddr->s6_addr32[0], |
105 | (__force u32)raddr->s6_addr32[1], |
106 | (__force u32)raddr->s6_addr32[2], |
107 | rnd); |
108 | |
109 | c = jhash_2words((__force u32)raddr->s6_addr32[3], |
110 | (__force u32)rport, |
111 | c); |
112 | |
113 | return c & (synq_hsize - 1); |
114 | } |
115 | |
116 | struct request_sock *inet6_csk_search_req(const struct sock *sk, |
117 | struct request_sock ***prevp, |
118 | const __be16 rport, |
119 | const struct in6_addr *raddr, |
120 | const struct in6_addr *laddr, |
121 | const int iif) |
122 | { |
123 | const struct inet_connection_sock *icsk = inet_csk(sk); |
124 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; |
125 | struct request_sock *req, **prev; |
126 | |
127 | for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, |
128 | lopt->hash_rnd, |
129 | lopt->nr_table_entries)]; |
130 | (req = *prev) != NULL; |
131 | prev = &req->dl_next) { |
132 | const struct inet_request_sock *ireq = inet_rsk(req); |
133 | |
134 | if (ireq->ir_rmt_port == rport && |
135 | req->rsk_ops->family == AF_INET6 && |
136 | ipv6_addr_equal(&ireq->ir_v6_rmt_addr, raddr) && |
137 | ipv6_addr_equal(&ireq->ir_v6_loc_addr, laddr) && |
138 | (!ireq->ir_iif || ireq->ir_iif == iif)) { |
139 | WARN_ON(req->sk != NULL); |
140 | *prevp = prev; |
141 | return req; |
142 | } |
143 | } |
144 | |
145 | return NULL; |
146 | } |
147 | |
148 | EXPORT_SYMBOL_GPL(inet6_csk_search_req); |
149 | |
150 | void inet6_csk_reqsk_queue_hash_add(struct sock *sk, |
151 | struct request_sock *req, |
152 | const unsigned long timeout) |
153 | { |
154 | struct inet_connection_sock *icsk = inet_csk(sk); |
155 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; |
156 | const u32 h = inet6_synq_hash(&inet_rsk(req)->ir_v6_rmt_addr, |
157 | inet_rsk(req)->ir_rmt_port, |
158 | lopt->hash_rnd, lopt->nr_table_entries); |
159 | |
160 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); |
161 | inet_csk_reqsk_queue_added(sk, timeout); |
162 | } |
163 | |
164 | EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); |
165 | |
166 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) |
167 | { |
168 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; |
169 | |
170 | sin6->sin6_family = AF_INET6; |
171 | sin6->sin6_addr = sk->sk_v6_daddr; |
172 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
173 | /* We do not store received flowlabel for TCP */ |
174 | sin6->sin6_flowinfo = 0; |
175 | sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, |
176 | sk->sk_bound_dev_if); |
177 | } |
178 | |
179 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); |
180 | |
181 | static inline |
182 | void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, |
183 | const struct in6_addr *daddr, |
184 | const struct in6_addr *saddr) |
185 | { |
186 | __ip6_dst_store(sk, dst, daddr, saddr); |
187 | } |
188 | |
189 | static inline |
190 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) |
191 | { |
192 | return __sk_dst_check(sk, cookie); |
193 | } |
194 | |
195 | static struct dst_entry *inet6_csk_route_socket(struct sock *sk, |
196 | struct flowi6 *fl6) |
197 | { |
198 | struct inet_sock *inet = inet_sk(sk); |
199 | struct ipv6_pinfo *np = inet6_sk(sk); |
200 | struct in6_addr *final_p, final; |
201 | struct dst_entry *dst; |
202 | |
203 | memset(fl6, 0, sizeof(*fl6)); |
204 | fl6->flowi6_proto = sk->sk_protocol; |
205 | fl6->daddr = sk->sk_v6_daddr; |
206 | fl6->saddr = np->saddr; |
207 | fl6->flowlabel = np->flow_label; |
208 | IP6_ECN_flow_xmit(sk, fl6->flowlabel); |
209 | fl6->flowi6_oif = sk->sk_bound_dev_if; |
210 | fl6->flowi6_mark = sk->sk_mark; |
211 | fl6->fl6_sport = inet->inet_sport; |
212 | fl6->fl6_dport = inet->inet_dport; |
213 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); |
214 | |
215 | final_p = fl6_update_dst(fl6, np->opt, &final); |
216 | |
217 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
218 | if (!dst) { |
219 | dst = ip6_dst_lookup_flow(sk, fl6, final_p, false); |
220 | |
221 | if (!IS_ERR(dst)) |
222 | __inet6_csk_dst_store(sk, dst, NULL, NULL); |
223 | } |
224 | return dst; |
225 | } |
226 | |
227 | int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused) |
228 | { |
229 | struct sock *sk = skb->sk; |
230 | struct ipv6_pinfo *np = inet6_sk(sk); |
231 | struct flowi6 fl6; |
232 | struct dst_entry *dst; |
233 | int res; |
234 | |
235 | dst = inet6_csk_route_socket(sk, &fl6); |
236 | if (IS_ERR(dst)) { |
237 | sk->sk_err_soft = -PTR_ERR(dst); |
238 | sk->sk_route_caps = 0; |
239 | kfree_skb(skb); |
240 | return PTR_ERR(dst); |
241 | } |
242 | |
243 | rcu_read_lock(); |
244 | skb_dst_set_noref(skb, dst); |
245 | |
246 | /* Restore final destination back after routing done */ |
247 | fl6.daddr = sk->sk_v6_daddr; |
248 | |
249 | res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass); |
250 | rcu_read_unlock(); |
251 | return res; |
252 | } |
253 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |
254 | |
255 | struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu) |
256 | { |
257 | struct flowi6 fl6; |
258 | struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6); |
259 | |
260 | if (IS_ERR(dst)) |
261 | return NULL; |
262 | dst->ops->update_pmtu(dst, sk, NULL, mtu); |
263 | |
264 | dst = inet6_csk_route_socket(sk, &fl6); |
265 | return IS_ERR(dst) ? NULL : dst; |
266 | } |
267 | EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu); |
268 |
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