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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
31int inet6_csk_bind_conflict(const struct sock *sk,
32 const struct inet_bind_bucket *tb, bool relax)
33{
34 const struct sock *sk2;
35 int reuse = sk->sk_reuse;
36 int reuseport = sk->sk_reuseport;
37 kuid_t uid = sock_i_uid((struct sock *)sk);
38
39 /* We must walk the whole port owner list in this case. -DaveM */
40 /*
41 * See comment in inet_csk_bind_conflict about sock lookup
42 * vs net namespaces issues.
43 */
44 sk_for_each_bound(sk2, &tb->owners) {
45 if (sk != sk2 &&
46 (!sk->sk_bound_dev_if ||
47 !sk2->sk_bound_dev_if ||
48 sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
49 if ((!reuse || !sk2->sk_reuse ||
50 sk2->sk_state == TCP_LISTEN) &&
51 (!reuseport || !sk2->sk_reuseport ||
52 rcu_access_pointer(sk->sk_reuseport_cb) ||
53 (sk2->sk_state != TCP_TIME_WAIT &&
54 !uid_eq(uid,
55 sock_i_uid((struct sock *)sk2))))) {
56 if (ipv6_rcv_saddr_equal(sk, sk2, true))
57 break;
58 }
59 if (!relax && reuse && sk2->sk_reuse &&
60 sk2->sk_state != TCP_LISTEN &&
61 ipv6_rcv_saddr_equal(sk, sk2, true))
62 break;
63 }
64 }
65
66 return sk2 != NULL;
67}
68EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
69
70struct dst_entry *inet6_csk_route_req(const struct sock *sk,
71 struct flowi6 *fl6,
72 const struct request_sock *req,
73 u8 proto)
74{
75 struct inet_request_sock *ireq = inet_rsk(req);
76 const struct ipv6_pinfo *np = inet6_sk(sk);
77 struct in6_addr *final_p, final;
78 struct dst_entry *dst;
79
80 memset(fl6, 0, sizeof(*fl6));
81 fl6->flowi6_proto = proto;
82 fl6->daddr = ireq->ir_v6_rmt_addr;
83 rcu_read_lock();
84 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
85 rcu_read_unlock();
86 fl6->saddr = ireq->ir_v6_loc_addr;
87 fl6->flowi6_oif = ireq->ir_iif;
88 fl6->flowi6_mark = ireq->ir_mark;
89 fl6->fl6_dport = ireq->ir_rmt_port;
90 fl6->fl6_sport = htons(ireq->ir_num);
91 security_req_classify_flow(req, flowi6_to_flowi(fl6));
92
93 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
94 if (IS_ERR(dst))
95 return NULL;
96
97 return dst;
98}
99EXPORT_SYMBOL(inet6_csk_route_req);
100
101void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
102{
103 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
104
105 sin6->sin6_family = AF_INET6;
106 sin6->sin6_addr = sk->sk_v6_daddr;
107 sin6->sin6_port = inet_sk(sk)->inet_dport;
108 /* We do not store received flowlabel for TCP */
109 sin6->sin6_flowinfo = 0;
110 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
111 sk->sk_bound_dev_if);
112}
113EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
114
115static inline
116struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
117{
118 return __sk_dst_check(sk, cookie);
119}
120
121static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
122 struct flowi6 *fl6)
123{
124 struct inet_sock *inet = inet_sk(sk);
125 struct ipv6_pinfo *np = inet6_sk(sk);
126 struct in6_addr *final_p, final;
127 struct dst_entry *dst;
128
129 memset(fl6, 0, sizeof(*fl6));
130 fl6->flowi6_proto = sk->sk_protocol;
131 fl6->daddr = sk->sk_v6_daddr;
132 fl6->saddr = np->saddr;
133 fl6->flowlabel = np->flow_label;
134 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
135 fl6->flowi6_oif = sk->sk_bound_dev_if;
136 fl6->flowi6_mark = sk->sk_mark;
137 fl6->fl6_sport = inet->inet_sport;
138 fl6->fl6_dport = inet->inet_dport;
139 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
140
141 rcu_read_lock();
142 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
143 rcu_read_unlock();
144
145 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
146 if (!dst) {
147 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
148
149 if (!IS_ERR(dst))
150 ip6_dst_store(sk, dst, NULL, NULL);
151 }
152 return dst;
153}
154
155int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
156{
157 struct ipv6_pinfo *np = inet6_sk(sk);
158 struct flowi6 fl6;
159 struct dst_entry *dst;
160 int res;
161
162 dst = inet6_csk_route_socket(sk, &fl6);
163 if (IS_ERR(dst)) {
164 sk->sk_err_soft = -PTR_ERR(dst);
165 sk->sk_route_caps = 0;
166 kfree_skb(skb);
167 return PTR_ERR(dst);
168 }
169
170 rcu_read_lock();
171 skb_dst_set_noref(skb, dst);
172
173 /* Restore final destination back after routing done */
174 fl6.daddr = sk->sk_v6_daddr;
175
176 res = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt),
177 np->tclass);
178 rcu_read_unlock();
179 return res;
180}
181EXPORT_SYMBOL_GPL(inet6_csk_xmit);
182
183struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
184{
185 struct flowi6 fl6;
186 struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
187
188 if (IS_ERR(dst))
189 return NULL;
190 dst->ops->update_pmtu(dst, sk, NULL, mtu);
191
192 dst = inet6_csk_route_socket(sk, &fl6);
193 return IS_ERR(dst) ? NULL : dst;
194}
195EXPORT_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#include <net/sock_reuseport.h>
30
31int inet6_csk_bind_conflict(const struct sock *sk,
32 const struct inet_bind_bucket *tb, bool relax,
33 bool reuseport_ok)
34{
35 const struct sock *sk2;
36 bool reuse = !!sk->sk_reuse;
37 bool reuseport = !!sk->sk_reuseport && reuseport_ok;
38 kuid_t uid = sock_i_uid((struct sock *)sk);
39
40 /* We must walk the whole port owner list in this case. -DaveM */
41 /*
42 * See comment in inet_csk_bind_conflict about sock lookup
43 * vs net namespaces issues.
44 */
45 sk_for_each_bound(sk2, &tb->owners) {
46 if (sk != sk2 &&
47 (!sk->sk_bound_dev_if ||
48 !sk2->sk_bound_dev_if ||
49 sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
50 if ((!reuse || !sk2->sk_reuse ||
51 sk2->sk_state == TCP_LISTEN) &&
52 (!reuseport || !sk2->sk_reuseport ||
53 rcu_access_pointer(sk->sk_reuseport_cb) ||
54 (sk2->sk_state != TCP_TIME_WAIT &&
55 !uid_eq(uid,
56 sock_i_uid((struct sock *)sk2))))) {
57 if (ipv6_rcv_saddr_equal(sk, sk2, true))
58 break;
59 }
60 if (!relax && reuse && sk2->sk_reuse &&
61 sk2->sk_state != TCP_LISTEN &&
62 ipv6_rcv_saddr_equal(sk, sk2, true))
63 break;
64 }
65 }
66
67 return sk2 != NULL;
68}
69EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
70
71struct dst_entry *inet6_csk_route_req(const struct sock *sk,
72 struct flowi6 *fl6,
73 const struct request_sock *req,
74 u8 proto)
75{
76 struct inet_request_sock *ireq = inet_rsk(req);
77 const struct ipv6_pinfo *np = inet6_sk(sk);
78 struct in6_addr *final_p, final;
79 struct dst_entry *dst;
80
81 memset(fl6, 0, sizeof(*fl6));
82 fl6->flowi6_proto = proto;
83 fl6->daddr = ireq->ir_v6_rmt_addr;
84 rcu_read_lock();
85 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
86 rcu_read_unlock();
87 fl6->saddr = ireq->ir_v6_loc_addr;
88 fl6->flowi6_oif = ireq->ir_iif;
89 fl6->flowi6_mark = ireq->ir_mark;
90 fl6->fl6_dport = ireq->ir_rmt_port;
91 fl6->fl6_sport = htons(ireq->ir_num);
92 fl6->flowi6_uid = sk->sk_uid;
93 security_req_classify_flow(req, flowi6_to_flowi(fl6));
94
95 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
96 if (IS_ERR(dst))
97 return NULL;
98
99 return dst;
100}
101EXPORT_SYMBOL(inet6_csk_route_req);
102
103void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
104{
105 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
106
107 sin6->sin6_family = AF_INET6;
108 sin6->sin6_addr = sk->sk_v6_daddr;
109 sin6->sin6_port = inet_sk(sk)->inet_dport;
110 /* We do not store received flowlabel for TCP */
111 sin6->sin6_flowinfo = 0;
112 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
113 sk->sk_bound_dev_if);
114}
115EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
116
117static inline
118struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
119{
120 return __sk_dst_check(sk, cookie);
121}
122
123static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
124 struct flowi6 *fl6)
125{
126 struct inet_sock *inet = inet_sk(sk);
127 struct ipv6_pinfo *np = inet6_sk(sk);
128 struct in6_addr *final_p, final;
129 struct dst_entry *dst;
130
131 memset(fl6, 0, sizeof(*fl6));
132 fl6->flowi6_proto = sk->sk_protocol;
133 fl6->daddr = sk->sk_v6_daddr;
134 fl6->saddr = np->saddr;
135 fl6->flowlabel = np->flow_label;
136 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
137 fl6->flowi6_oif = sk->sk_bound_dev_if;
138 fl6->flowi6_mark = sk->sk_mark;
139 fl6->fl6_sport = inet->inet_sport;
140 fl6->fl6_dport = inet->inet_dport;
141 fl6->flowi6_uid = sk->sk_uid;
142 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
143
144 rcu_read_lock();
145 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
146 rcu_read_unlock();
147
148 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
149 if (!dst) {
150 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
151
152 if (!IS_ERR(dst))
153 ip6_dst_store(sk, dst, NULL, NULL);
154 }
155 return dst;
156}
157
158int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
159{
160 struct ipv6_pinfo *np = inet6_sk(sk);
161 struct flowi6 fl6;
162 struct dst_entry *dst;
163 int res;
164
165 dst = inet6_csk_route_socket(sk, &fl6);
166 if (IS_ERR(dst)) {
167 sk->sk_err_soft = -PTR_ERR(dst);
168 sk->sk_route_caps = 0;
169 kfree_skb(skb);
170 return PTR_ERR(dst);
171 }
172
173 rcu_read_lock();
174 skb_dst_set_noref(skb, dst);
175
176 /* Restore final destination back after routing done */
177 fl6.daddr = sk->sk_v6_daddr;
178
179 res = ip6_xmit(sk, skb, &fl6, sk->sk_mark, rcu_dereference(np->opt),
180 np->tclass);
181 rcu_read_unlock();
182 return res;
183}
184EXPORT_SYMBOL_GPL(inet6_csk_xmit);
185
186struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
187{
188 struct flowi6 fl6;
189 struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
190
191 if (IS_ERR(dst))
192 return NULL;
193 dst->ops->update_pmtu(dst, sk, NULL, mtu);
194
195 dst = inet6_csk_route_socket(sk, &fl6);
196 return IS_ERR(dst) ? NULL : dst;
197}
198EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);