These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / net / ipv6 / inet6_connection_sock.c
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(const struct sock *sk,
69                                       struct flowi6 *fl6,
70                                       const struct request_sock *req,
71                                       u8 proto)
72 {
73         struct inet_request_sock *ireq = inet_rsk(req);
74         const 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 = proto;
80         fl6->daddr = ireq->ir_v6_rmt_addr;
81         rcu_read_lock();
82         final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
83         rcu_read_unlock();
84         fl6->saddr = ireq->ir_v6_loc_addr;
85         fl6->flowi6_oif = ireq->ir_iif;
86         fl6->flowi6_mark = ireq->ir_mark;
87         fl6->fl6_dport = ireq->ir_rmt_port;
88         fl6->fl6_sport = htons(ireq->ir_num);
89         security_req_classify_flow(req, flowi6_to_flowi(fl6));
90
91         dst = ip6_dst_lookup_flow(sk, fl6, final_p);
92         if (IS_ERR(dst))
93                 return NULL;
94
95         return dst;
96 }
97 EXPORT_SYMBOL(inet6_csk_route_req);
98
99 void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
100 {
101         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
102
103         sin6->sin6_family = AF_INET6;
104         sin6->sin6_addr = sk->sk_v6_daddr;
105         sin6->sin6_port = inet_sk(sk)->inet_dport;
106         /* We do not store received flowlabel for TCP */
107         sin6->sin6_flowinfo = 0;
108         sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
109                                                   sk->sk_bound_dev_if);
110 }
111 EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
112
113 static inline
114 struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
115 {
116         return __sk_dst_check(sk, cookie);
117 }
118
119 static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
120                                                 struct flowi6 *fl6)
121 {
122         struct inet_sock *inet = inet_sk(sk);
123         struct ipv6_pinfo *np = inet6_sk(sk);
124         struct in6_addr *final_p, final;
125         struct dst_entry *dst;
126
127         memset(fl6, 0, sizeof(*fl6));
128         fl6->flowi6_proto = sk->sk_protocol;
129         fl6->daddr = sk->sk_v6_daddr;
130         fl6->saddr = np->saddr;
131         fl6->flowlabel = np->flow_label;
132         IP6_ECN_flow_xmit(sk, fl6->flowlabel);
133         fl6->flowi6_oif = sk->sk_bound_dev_if;
134         fl6->flowi6_mark = sk->sk_mark;
135         fl6->fl6_sport = inet->inet_sport;
136         fl6->fl6_dport = inet->inet_dport;
137         security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
138
139         rcu_read_lock();
140         final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
141         rcu_read_unlock();
142
143         dst = __inet6_csk_dst_check(sk, np->dst_cookie);
144         if (!dst) {
145                 dst = ip6_dst_lookup_flow(sk, fl6, final_p);
146
147                 if (!IS_ERR(dst))
148                         ip6_dst_store(sk, dst, NULL, NULL);
149         }
150         return dst;
151 }
152
153 int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
154 {
155         struct ipv6_pinfo *np = inet6_sk(sk);
156         struct flowi6 fl6;
157         struct dst_entry *dst;
158         int res;
159
160         dst = inet6_csk_route_socket(sk, &fl6);
161         if (IS_ERR(dst)) {
162                 sk->sk_err_soft = -PTR_ERR(dst);
163                 sk->sk_route_caps = 0;
164                 kfree_skb(skb);
165                 return PTR_ERR(dst);
166         }
167
168         rcu_read_lock();
169         skb_dst_set_noref(skb, dst);
170
171         /* Restore final destination back after routing done */
172         fl6.daddr = sk->sk_v6_daddr;
173
174         res = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt),
175                        np->tclass);
176         rcu_read_unlock();
177         return res;
178 }
179 EXPORT_SYMBOL_GPL(inet6_csk_xmit);
180
181 struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
182 {
183         struct flowi6 fl6;
184         struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
185
186         if (IS_ERR(dst))
187                 return NULL;
188         dst->ops->update_pmtu(dst, sk, NULL, mtu);
189
190         dst = inet6_csk_route_socket(sk, &fl6);
191         return IS_ERR(dst) ? NULL : dst;
192 }
193 EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);