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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#include <net/sock_reuseport.h>
30
31struct dst_entry *inet6_csk_route_req(const struct sock *sk,
32 struct flowi6 *fl6,
33 const struct request_sock *req,
34 u8 proto)
35{
36 struct inet_request_sock *ireq = inet_rsk(req);
37 const struct ipv6_pinfo *np = inet6_sk(sk);
38 struct in6_addr *final_p, final;
39 struct dst_entry *dst;
40
41 memset(fl6, 0, sizeof(*fl6));
42 fl6->flowi6_proto = proto;
43 fl6->daddr = ireq->ir_v6_rmt_addr;
44 rcu_read_lock();
45 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
46 rcu_read_unlock();
47 fl6->saddr = ireq->ir_v6_loc_addr;
48 fl6->flowi6_oif = ireq->ir_iif;
49 fl6->flowi6_mark = ireq->ir_mark;
50 fl6->fl6_dport = ireq->ir_rmt_port;
51 fl6->fl6_sport = htons(ireq->ir_num);
52 fl6->flowi6_uid = sk->sk_uid;
53 security_req_classify_flow(req, flowi6_to_flowi(fl6));
54
55 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
56 if (IS_ERR(dst))
57 return NULL;
58
59 return dst;
60}
61EXPORT_SYMBOL(inet6_csk_route_req);
62
63void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
64{
65 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
66
67 sin6->sin6_family = AF_INET6;
68 sin6->sin6_addr = sk->sk_v6_daddr;
69 sin6->sin6_port = inet_sk(sk)->inet_dport;
70 /* We do not store received flowlabel for TCP */
71 sin6->sin6_flowinfo = 0;
72 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
73 sk->sk_bound_dev_if);
74}
75EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
76
77static inline
78struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
79{
80 return __sk_dst_check(sk, cookie);
81}
82
83static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
84 struct flowi6 *fl6)
85{
86 struct inet_sock *inet = inet_sk(sk);
87 struct ipv6_pinfo *np = inet6_sk(sk);
88 struct in6_addr *final_p, final;
89 struct dst_entry *dst;
90
91 memset(fl6, 0, sizeof(*fl6));
92 fl6->flowi6_proto = sk->sk_protocol;
93 fl6->daddr = sk->sk_v6_daddr;
94 fl6->saddr = np->saddr;
95 fl6->flowlabel = np->flow_label;
96 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
97 fl6->flowi6_oif = sk->sk_bound_dev_if;
98 fl6->flowi6_mark = sk->sk_mark;
99 fl6->fl6_sport = inet->inet_sport;
100 fl6->fl6_dport = inet->inet_dport;
101 fl6->flowi6_uid = sk->sk_uid;
102 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
103
104 rcu_read_lock();
105 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
106 rcu_read_unlock();
107
108 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
109 if (!dst) {
110 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
111
112 if (!IS_ERR(dst))
113 ip6_dst_store(sk, dst, NULL, NULL);
114 }
115 return dst;
116}
117
118int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
119{
120 struct ipv6_pinfo *np = inet6_sk(sk);
121 struct flowi6 fl6;
122 struct dst_entry *dst;
123 int res;
124
125 dst = inet6_csk_route_socket(sk, &fl6);
126 if (IS_ERR(dst)) {
127 sk->sk_err_soft = -PTR_ERR(dst);
128 sk->sk_route_caps = 0;
129 kfree_skb(skb);
130 return PTR_ERR(dst);
131 }
132
133 rcu_read_lock();
134 skb_dst_set_noref(skb, dst);
135
136 /* Restore final destination back after routing done */
137 fl6.daddr = sk->sk_v6_daddr;
138
139 res = ip6_xmit(sk, skb, &fl6, sk->sk_mark, rcu_dereference(np->opt),
140 np->tclass);
141 rcu_read_unlock();
142 return res;
143}
144EXPORT_SYMBOL_GPL(inet6_csk_xmit);
145
146struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
147{
148 struct flowi6 fl6;
149 struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
150
151 if (IS_ERR(dst))
152 return NULL;
153 dst->ops->update_pmtu(dst, sk, NULL, mtu);
154
155 dst = inet6_csk_route_socket(sk, &fl6);
156 return IS_ERR(dst) ? NULL : dst;
157}
158EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);
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
30int 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
67EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
68
69struct 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);
90 if (IS_ERR(dst))
91 return NULL;
92
93 return dst;
94}
95
96/*
97 * request_sock (formerly open request) hash tables.
98 */
99static 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
116struct 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
148EXPORT_SYMBOL_GPL(inet6_csk_search_req);
149
150void 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
164EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
165
166void 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
179EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
180
181static inline
182void __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
189static inline
190struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
191{
192 return __sk_dst_check(sk, cookie);
193}
194
195static 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);
220
221 if (!IS_ERR(dst))
222 __inet6_csk_dst_store(sk, dst, NULL, NULL);
223 }
224 return dst;
225}
226
227int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
228{
229 struct ipv6_pinfo *np = inet6_sk(sk);
230 struct flowi6 fl6;
231 struct dst_entry *dst;
232 int res;
233
234 dst = inet6_csk_route_socket(sk, &fl6);
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);
240 }
241
242 rcu_read_lock();
243 skb_dst_set_noref(skb, dst);
244
245 /* Restore final destination back after routing done */
246 fl6.daddr = sk->sk_v6_daddr;
247
248 res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
249 rcu_read_unlock();
250 return res;
251}
252EXPORT_SYMBOL_GPL(inet6_csk_xmit);
253
254struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
255{
256 struct flowi6 fl6;
257 struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
258
259 if (IS_ERR(dst))
260 return NULL;
261 dst->ops->update_pmtu(dst, sk, NULL, mtu);
262
263 dst = inet6_csk_route_socket(sk, &fl6);
264 return IS_ERR(dst) ? NULL : dst;
265}
266EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);