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TOMOYO Linux Cross Reference
Linux/net/ipv6/inet6_connection_sock.c

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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 
 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, true))
 55                                         break;
 56                         }
 57                         if (!relax && reuse && sk2->sk_reuse &&
 58                             sk2->sk_state != TCP_LISTEN &&
 59                             ipv6_rcv_saddr_equal(sk, sk2, true))
 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);
194 

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