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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 | } | |
dd9f319d FL |
57 | if (!relax && reuse && sk2->sk_reuse && |
58 | sk2->sk_state != TCP_LISTEN && | |
59 | ipv6_rcv_saddr_equal(sk, sk2)) | |
60 | break; | |
5ba24953 | 61 | } |
b9750ce1 ACM |
62 | } |
63 | ||
b67bfe0d | 64 | return sk2 != NULL; |
b9750ce1 ACM |
65 | } |
66 | ||
67 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); | |
68 | ||
ae4694b2 | 69 | struct dst_entry *inet6_csk_route_req(struct sock *sk, |
3840a06e | 70 | struct flowi6 *fl6, |
ae4694b2 DM |
71 | const struct request_sock *req) |
72 | { | |
634fb979 | 73 | struct inet_request_sock *ireq = inet_rsk(req); |
ae4694b2 DM |
74 | struct ipv6_pinfo *np = inet6_sk(sk); |
75 | struct in6_addr *final_p, final; | |
76 | struct dst_entry *dst; | |
4c9483b2 | 77 | |
3840a06e NC |
78 | memset(fl6, 0, sizeof(*fl6)); |
79 | fl6->flowi6_proto = IPPROTO_TCP; | |
634fb979 | 80 | fl6->daddr = ireq->ir_v6_rmt_addr; |
3840a06e | 81 | final_p = fl6_update_dst(fl6, np->opt, &final); |
634fb979 ED |
82 | fl6->saddr = ireq->ir_v6_loc_addr; |
83 | fl6->flowi6_oif = ireq->ir_iif; | |
3840a06e | 84 | fl6->flowi6_mark = sk->sk_mark; |
634fb979 | 85 | fl6->fl6_dport = ireq->ir_rmt_port; |
b44084c2 | 86 | fl6->fl6_sport = htons(ireq->ir_num); |
3840a06e | 87 | security_req_classify_flow(req, flowi6_to_flowi(fl6)); |
4c9483b2 | 88 | |
0e0d44ab | 89 | dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
68d0c6d3 | 90 | if (IS_ERR(dst)) |
ae4694b2 DM |
91 | return NULL; |
92 | ||
93 | return dst; | |
94 | } | |
95 | ||
8129765a ACM |
96 | /* |
97 | * request_sock (formerly open request) hash tables. | |
98 | */ | |
fede70b9 | 99 | static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, |
c16a98ed | 100 | const u32 rnd, const u32 synq_hsize) |
8129765a | 101 | { |
82a39eb6 | 102 | u32 c; |
8129765a | 103 | |
82a39eb6 JK |
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); | |
8129765a | 108 | |
82a39eb6 JK |
109 | c = jhash_2words((__force u32)raddr->s6_addr32[3], |
110 | (__force u32)rport, | |
111 | c); | |
8129765a ACM |
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, | |
fede70b9 | 118 | const __be16 rport, |
8129765a ACM |
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) { | |
634fb979 | 132 | const struct inet_request_sock *ireq = inet_rsk(req); |
8129765a | 133 | |
634fb979 | 134 | if (ireq->ir_rmt_port == rport && |
8129765a | 135 | req->rsk_ops->family == AF_INET6 && |
634fb979 ED |
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)) { | |
547b792c | 139 | WARN_ON(req->sk != NULL); |
8129765a ACM |
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; | |
634fb979 ED |
156 | const u32 h = inet6_synq_hash(&inet_rsk(req)->ir_v6_rmt_addr, |
157 | inet_rsk(req)->ir_rmt_port, | |
8129765a ACM |
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); | |
b9750ce1 ACM |
165 | |
166 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr) | |
167 | { | |
b9750ce1 ACM |
168 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; |
169 | ||
170 | sin6->sin6_family = AF_INET6; | |
efe4208f | 171 | sin6->sin6_addr = sk->sk_v6_daddr; |
c720c7e8 | 172 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
b9750ce1 ACM |
173 | /* We do not store received flowlabel for TCP */ |
174 | sin6->sin6_flowinfo = 0; | |
842df073 HFS |
175 | sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, |
176 | sk->sk_bound_dev_if); | |
b9750ce1 ACM |
177 | } |
178 | ||
179 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); | |
180 | ||
a47ed4cd NT |
181 | static inline |
182 | void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, | |
d3818c92 ED |
183 | const struct in6_addr *daddr, |
184 | const struct in6_addr *saddr) | |
a47ed4cd NT |
185 | { |
186 | __ip6_dst_store(sk, dst, daddr, saddr); | |
a47ed4cd NT |
187 | } |
188 | ||
189 | static inline | |
190 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
191 | { | |
6f3118b5 | 192 | return __sk_dst_check(sk, cookie); |
a47ed4cd NT |
193 | } |
194 | ||
d3818c92 ED |
195 | static struct dst_entry *inet6_csk_route_socket(struct sock *sk, |
196 | struct flowi6 *fl6) | |
b9750ce1 | 197 | { |
b9750ce1 ACM |
198 | struct inet_sock *inet = inet_sk(sk); |
199 | struct ipv6_pinfo *np = inet6_sk(sk); | |
20c59de2 | 200 | struct in6_addr *final_p, final; |
35ad9b9c | 201 | struct dst_entry *dst; |
b9750ce1 | 202 | |
d3818c92 ED |
203 | memset(fl6, 0, sizeof(*fl6)); |
204 | fl6->flowi6_proto = sk->sk_protocol; | |
efe4208f | 205 | fl6->daddr = sk->sk_v6_daddr; |
d3818c92 ED |
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)); | |
b9750ce1 | 214 | |
d3818c92 | 215 | final_p = fl6_update_dst(fl6, np->opt, &final); |
b9750ce1 | 216 | |
a47ed4cd | 217 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
35ad9b9c | 218 | if (!dst) { |
0e0d44ab | 219 | dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
b9750ce1 | 220 | |
35ad9b9c DM |
221 | if (!IS_ERR(dst)) |
222 | __inet6_csk_dst_store(sk, dst, NULL, NULL); | |
223 | } | |
224 | return dst; | |
225 | } | |
b9750ce1 | 226 | |
b0270e91 | 227 | int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused) |
35ad9b9c | 228 | { |
35ad9b9c DM |
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 */ | |
efe4208f | 246 | fl6.daddr = sk->sk_v6_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); |