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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 #include <net/sock_reuseport.h>
 30 
 31 struct 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 }
 61 EXPORT_SYMBOL(inet6_csk_route_req);
 62 
 63 void 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 }
 75 EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
 76 
 77 static inline
 78 struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
 79 {
 80         return __sk_dst_check(sk, cookie);
 81 }
 82 
 83 static 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 
118 int 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 }
144 EXPORT_SYMBOL_GPL(inet6_csk_xmit);
145 
146 struct 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 }
158 EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);
159 

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