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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Support for INET6 connection oriented protocols.
8 *
9 * Authors: See the TCPv6 sources
10 */
11
12#include <linux/module.h>
13#include <linux/in6.h>
14#include <linux/ipv6.h>
15#include <linux/jhash.h>
16#include <linux/slab.h>
17
18#include <net/addrconf.h>
19#include <net/inet_connection_sock.h>
20#include <net/inet_ecn.h>
21#include <net/inet_hashtables.h>
22#include <net/ip6_route.h>
23#include <net/sock.h>
24#include <net/inet6_connection_sock.h>
25#include <net/sock_reuseport.h>
26
27struct dst_entry *inet6_csk_route_req(const struct sock *sk,
28 struct flowi6 *fl6,
29 const struct request_sock *req,
30 u8 proto)
31{
32 struct inet_request_sock *ireq = inet_rsk(req);
33 const struct ipv6_pinfo *np = inet6_sk(sk);
34 struct in6_addr *final_p, final;
35 struct dst_entry *dst;
36
37 memset(fl6, 0, sizeof(*fl6));
38 fl6->flowi6_proto = proto;
39 fl6->daddr = ireq->ir_v6_rmt_addr;
40 rcu_read_lock();
41 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
42 rcu_read_unlock();
43 fl6->saddr = ireq->ir_v6_loc_addr;
44 fl6->flowi6_oif = ireq->ir_iif;
45 fl6->flowi6_mark = ireq->ir_mark;
46 fl6->fl6_dport = ireq->ir_rmt_port;
47 fl6->fl6_sport = htons(ireq->ir_num);
48 fl6->flowi6_uid = sk->sk_uid;
49 security_req_classify_flow(req, flowi6_to_flowi_common(fl6));
50
51 dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
52 if (IS_ERR(dst))
53 return NULL;
54
55 return dst;
56}
57EXPORT_SYMBOL(inet6_csk_route_req);
58
59void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
60{
61 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
62
63 sin6->sin6_family = AF_INET6;
64 sin6->sin6_addr = sk->sk_v6_daddr;
65 sin6->sin6_port = inet_sk(sk)->inet_dport;
66 /* We do not store received flowlabel for TCP */
67 sin6->sin6_flowinfo = 0;
68 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
69 sk->sk_bound_dev_if);
70}
71EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
72
73static inline
74struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
75{
76 return __sk_dst_check(sk, cookie);
77}
78
79static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
80 struct flowi6 *fl6)
81{
82 struct inet_sock *inet = inet_sk(sk);
83 struct ipv6_pinfo *np = inet6_sk(sk);
84 struct in6_addr *final_p, final;
85 struct dst_entry *dst;
86
87 memset(fl6, 0, sizeof(*fl6));
88 fl6->flowi6_proto = sk->sk_protocol;
89 fl6->daddr = sk->sk_v6_daddr;
90 fl6->saddr = np->saddr;
91 fl6->flowlabel = np->flow_label;
92 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
93 fl6->flowi6_oif = sk->sk_bound_dev_if;
94 fl6->flowi6_mark = sk->sk_mark;
95 fl6->fl6_sport = inet->inet_sport;
96 fl6->fl6_dport = inet->inet_dport;
97 fl6->flowi6_uid = sk->sk_uid;
98 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
99
100 rcu_read_lock();
101 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
102 rcu_read_unlock();
103
104 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
105 if (!dst) {
106 dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
107
108 if (!IS_ERR(dst))
109 ip6_dst_store(sk, dst, NULL, NULL);
110 }
111 return dst;
112}
113
114int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
115{
116 struct ipv6_pinfo *np = inet6_sk(sk);
117 struct flowi6 fl6;
118 struct dst_entry *dst;
119 int res;
120
121 dst = inet6_csk_route_socket(sk, &fl6);
122 if (IS_ERR(dst)) {
123 sk->sk_err_soft = -PTR_ERR(dst);
124 sk->sk_route_caps = 0;
125 kfree_skb(skb);
126 return PTR_ERR(dst);
127 }
128
129 rcu_read_lock();
130 skb_dst_set_noref(skb, dst);
131
132 /* Restore final destination back after routing done */
133 fl6.daddr = sk->sk_v6_daddr;
134
135 res = ip6_xmit(sk, skb, &fl6, sk->sk_mark, rcu_dereference(np->opt),
136 np->tclass, sk->sk_priority);
137 rcu_read_unlock();
138 return res;
139}
140EXPORT_SYMBOL_GPL(inet6_csk_xmit);
141
142struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
143{
144 struct flowi6 fl6;
145 struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
146
147 if (IS_ERR(dst))
148 return NULL;
149 dst->ops->update_pmtu(dst, sk, NULL, mtu, true);
150
151 dst = inet6_csk_route_socket(sk, &fl6);
152 return IS_ERR(dst) ? NULL : dst;
153}
154EXPORT_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
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);