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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 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); | |
67 | ||
68 | struct dst_entry *inet6_csk_route_req(struct sock *sk, | |
69 | struct flowi6 *fl6, | |
70 | const struct request_sock *req) | |
71 | { | |
72 | struct inet_request_sock *ireq = inet_rsk(req); | |
73 | struct ipv6_pinfo *np = inet6_sk(sk); | |
74 | struct in6_addr *final_p, final; | |
75 | struct dst_entry *dst; | |
76 | ||
77 | memset(fl6, 0, sizeof(*fl6)); | |
78 | fl6->flowi6_proto = IPPROTO_TCP; | |
79 | fl6->daddr = ireq->ir_v6_rmt_addr; | |
80 | final_p = fl6_update_dst(fl6, np->opt, &final); | |
81 | fl6->saddr = ireq->ir_v6_loc_addr; | |
82 | fl6->flowi6_oif = ireq->ir_iif; | |
83 | fl6->flowi6_mark = ireq->ir_mark; | |
84 | fl6->fl6_dport = ireq->ir_rmt_port; | |
85 | fl6->fl6_sport = htons(ireq->ir_num); | |
86 | security_req_classify_flow(req, flowi6_to_flowi(fl6)); | |
87 | ||
88 | dst = ip6_dst_lookup_flow(sk, fl6, final_p); | |
89 | if (IS_ERR(dst)) | |
90 | return NULL; | |
91 | ||
92 | return dst; | |
93 | } | |
94 | ||
95 | /* | |
96 | * request_sock (formerly open request) hash tables. | |
97 | */ | |
98 | static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, | |
99 | const u32 rnd, const u32 synq_hsize) | |
100 | { | |
101 | u32 c; | |
102 | ||
103 | c = jhash_3words((__force u32)raddr->s6_addr32[0], | |
104 | (__force u32)raddr->s6_addr32[1], | |
105 | (__force u32)raddr->s6_addr32[2], | |
106 | rnd); | |
107 | ||
108 | c = jhash_2words((__force u32)raddr->s6_addr32[3], | |
109 | (__force u32)rport, | |
110 | c); | |
111 | ||
112 | return c & (synq_hsize - 1); | |
113 | } | |
114 | ||
115 | struct request_sock *inet6_csk_search_req(struct sock *sk, | |
116 | const __be16 rport, | |
117 | const struct in6_addr *raddr, | |
118 | const struct in6_addr *laddr, | |
119 | const int iif) | |
120 | { | |
121 | struct inet_connection_sock *icsk = inet_csk(sk); | |
122 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
123 | struct request_sock *req; | |
124 | u32 hash = inet6_synq_hash(raddr, rport, lopt->hash_rnd, | |
125 | lopt->nr_table_entries); | |
126 | ||
127 | spin_lock(&icsk->icsk_accept_queue.syn_wait_lock); | |
128 | for (req = lopt->syn_table[hash]; req != NULL; req = req->dl_next) { | |
129 | const struct inet_request_sock *ireq = inet_rsk(req); | |
130 | ||
131 | if (ireq->ir_rmt_port == rport && | |
132 | req->rsk_ops->family == AF_INET6 && | |
133 | ipv6_addr_equal(&ireq->ir_v6_rmt_addr, raddr) && | |
134 | ipv6_addr_equal(&ireq->ir_v6_loc_addr, laddr) && | |
135 | (!ireq->ir_iif || ireq->ir_iif == iif)) { | |
136 | atomic_inc(&req->rsk_refcnt); | |
137 | WARN_ON(req->sk != NULL); | |
138 | break; | |
139 | } | |
140 | } | |
141 | spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock); | |
142 | ||
143 | return req; | |
144 | } | |
145 | EXPORT_SYMBOL_GPL(inet6_csk_search_req); | |
146 | ||
147 | void inet6_csk_reqsk_queue_hash_add(struct sock *sk, | |
148 | struct request_sock *req, | |
149 | const unsigned long timeout) | |
150 | { | |
151 | struct inet_connection_sock *icsk = inet_csk(sk); | |
152 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
153 | const u32 h = inet6_synq_hash(&inet_rsk(req)->ir_v6_rmt_addr, | |
154 | inet_rsk(req)->ir_rmt_port, | |
155 | lopt->hash_rnd, lopt->nr_table_entries); | |
156 | ||
157 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); | |
158 | inet_csk_reqsk_queue_added(sk, timeout); | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); | |
161 | ||
162 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) | |
163 | { | |
164 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; | |
165 | ||
166 | sin6->sin6_family = AF_INET6; | |
167 | sin6->sin6_addr = sk->sk_v6_daddr; | |
168 | sin6->sin6_port = inet_sk(sk)->inet_dport; | |
169 | /* We do not store received flowlabel for TCP */ | |
170 | sin6->sin6_flowinfo = 0; | |
171 | sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, | |
172 | sk->sk_bound_dev_if); | |
173 | } | |
174 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); | |
175 | ||
176 | static inline | |
177 | void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, | |
178 | const struct in6_addr *daddr, | |
179 | const struct in6_addr *saddr) | |
180 | { | |
181 | __ip6_dst_store(sk, dst, daddr, saddr); | |
182 | } | |
183 | ||
184 | static inline | |
185 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
186 | { | |
187 | return __sk_dst_check(sk, cookie); | |
188 | } | |
189 | ||
190 | static struct dst_entry *inet6_csk_route_socket(struct sock *sk, | |
191 | struct flowi6 *fl6) | |
192 | { | |
193 | struct inet_sock *inet = inet_sk(sk); | |
194 | struct ipv6_pinfo *np = inet6_sk(sk); | |
195 | struct in6_addr *final_p, final; | |
196 | struct dst_entry *dst; | |
197 | ||
198 | memset(fl6, 0, sizeof(*fl6)); | |
199 | fl6->flowi6_proto = sk->sk_protocol; | |
200 | fl6->daddr = sk->sk_v6_daddr; | |
201 | fl6->saddr = np->saddr; | |
202 | fl6->flowlabel = np->flow_label; | |
203 | IP6_ECN_flow_xmit(sk, fl6->flowlabel); | |
204 | fl6->flowi6_oif = sk->sk_bound_dev_if; | |
205 | fl6->flowi6_mark = sk->sk_mark; | |
206 | fl6->fl6_sport = inet->inet_sport; | |
207 | fl6->fl6_dport = inet->inet_dport; | |
208 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); | |
209 | ||
210 | final_p = fl6_update_dst(fl6, np->opt, &final); | |
211 | ||
212 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); | |
213 | if (!dst) { | |
214 | dst = ip6_dst_lookup_flow(sk, fl6, final_p); | |
215 | ||
216 | if (!IS_ERR(dst)) | |
217 | __inet6_csk_dst_store(sk, dst, NULL, NULL); | |
218 | } | |
219 | return dst; | |
220 | } | |
221 | ||
222 | int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused) | |
223 | { | |
224 | struct ipv6_pinfo *np = inet6_sk(sk); | |
225 | struct flowi6 fl6; | |
226 | struct dst_entry *dst; | |
227 | int res; | |
228 | ||
229 | dst = inet6_csk_route_socket(sk, &fl6); | |
230 | if (IS_ERR(dst)) { | |
231 | sk->sk_err_soft = -PTR_ERR(dst); | |
232 | sk->sk_route_caps = 0; | |
233 | kfree_skb(skb); | |
234 | return PTR_ERR(dst); | |
235 | } | |
236 | ||
237 | rcu_read_lock(); | |
238 | skb_dst_set_noref(skb, dst); | |
239 | ||
240 | /* Restore final destination back after routing done */ | |
241 | fl6.daddr = sk->sk_v6_daddr; | |
242 | ||
243 | res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass); | |
244 | rcu_read_unlock(); | |
245 | return res; | |
246 | } | |
247 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); | |
248 | ||
249 | struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu) | |
250 | { | |
251 | struct flowi6 fl6; | |
252 | struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6); | |
253 | ||
254 | if (IS_ERR(dst)) | |
255 | return NULL; | |
256 | dst->ops->update_pmtu(dst, sk, NULL, mtu); | |
257 | ||
258 | dst = inet6_csk_route_socket(sk, &fl6); | |
259 | return IS_ERR(dst) ? NULL : dst; | |
260 | } | |
261 | EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu); |