release/src-rt-6.x/linux/linux-2.6/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
  21 #include <net/addrconf.h>
  22 #include <net/inet_connection_sock.h>
  23 #include <net/inet_ecn.h>
  24 #include <net/inet_hashtables.h>
  25 #include <net/ip6_route.h>
  26 #include <net/sock.h>
  27 #include <net/inet6_connection_sock.h>
  28
  29 int inet6_csk_bind_conflict(const struct sock *sk,
  30                             const struct inet_bind_bucket *tb)
  31 {
  32         const struct sock *sk2;
  33         const struct hlist_node *node;
  34
  35         /* We must walk the whole port owner list in this case. -DaveM */
  36         sk_for_each_bound(sk2, node, &tb->owners) {
  37                 if (sk != sk2 &&
  38                     (!sk->sk_bound_dev_if ||
  39                      !sk2->sk_bound_dev_if ||
  40                      sk->sk_bound_dev_if == sk2->sk_bound_dev_if) &&
  41                     (!sk->sk_reuse || !sk2->sk_reuse ||
  42                      sk2->sk_state == TCP_LISTEN) &&
  43                      ipv6_rcv_saddr_equal(sk, sk2))
  44                         break;
  45         }
  46
  47         return node != NULL;
  48 }
  49
  50 EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
  51
  52 /*
  53  * request_sock (formerly open request) hash tables.
  54  */
  55 static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
  56                            const u32 rnd, const u16 synq_hsize)
  57 {
  58         u32 c;
  59
  60         c = jhash_3words((__force u32)raddr->s6_addr32[0],
  61                          (__force u32)raddr->s6_addr32[1],
  62                          (__force u32)raddr->s6_addr32[2],
  63                          rnd);
  64
  65         c = jhash_2words((__force u32)raddr->s6_addr32[3],
  66                          (__force u32)rport,
  67                          c);
  68
  69         return c & (synq_hsize - 1);
  70 }
  71
  72 struct request_sock *inet6_csk_search_req(const struct sock *sk,
  73                                           struct request_sock ***prevp,
  74                                           const __be16 rport,
  75                                           const struct in6_addr *raddr,
  76                                           const struct in6_addr *laddr,
  77                                           const int iif)
  78 {
  79         const struct inet_connection_sock *icsk = inet_csk(sk);
  80         struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
  81         struct request_sock *req, **prev;
  82
  83         for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
  84                                                      lopt->hash_rnd,
  85                                                      lopt->nr_table_entries)];
  86              (req = *prev) != NULL;
  87              prev = &req->dl_next) {
  88                 const struct inet6_request_sock *treq = inet6_rsk(req);
  89
  90                 if (inet_rsk(req)->rmt_port == rport &&
  91                     req->rsk_ops->family == AF_INET6 &&
  92                     ipv6_addr_equal(&treq->rmt_addr, raddr) &&
  93                     ipv6_addr_equal(&treq->loc_addr, laddr) &&
  94                     (!treq->iif || treq->iif == iif)) {
  95                         BUG_TRAP(req->sk == NULL);
  96                         *prevp = prev;
  97                         return req;
  98                 }
  99         }
 100
 101         return NULL;
 102 }
 103
 104 EXPORT_SYMBOL_GPL(inet6_csk_search_req);
 105
 106 void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
 107                                     struct request_sock *req,
 108                                     const unsigned long timeout)
 109 {
 110         struct inet_connection_sock *icsk = inet_csk(sk);
 111         struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
 112         const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
 113                                       inet_rsk(req)->rmt_port,
 114                                       lopt->hash_rnd, lopt->nr_table_entries);
 115
 116         reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
 117         inet_csk_reqsk_queue_added(sk, timeout);
 118 }
 119
 120 EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
 121
 122 void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
 123 {
 124         struct ipv6_pinfo *np = inet6_sk(sk);
 125         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
 126
 127         sin6->sin6_family = AF_INET6;
 128         ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
 129         sin6->sin6_port = inet_sk(sk)->dport;
 130         /* We do not store received flowlabel for TCP */
 131         sin6->sin6_flowinfo = 0;
 132         sin6->sin6_scope_id = 0;
 133         if (sk->sk_bound_dev_if &&
 134             ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 135                 sin6->sin6_scope_id = sk->sk_bound_dev_if;
 136 }
 137
 138 EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
 139
 140 int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
 141 {
 142         struct sock *sk = skb->sk;
 143         struct inet_sock *inet = inet_sk(sk);
 144         struct ipv6_pinfo *np = inet6_sk(sk);
 145         struct flowi fl;
 146         struct dst_entry *dst;
 147         struct in6_addr *final_p = NULL, final;
 148
 149         memset(&fl, 0, sizeof(fl));
 150         fl.proto = sk->sk_protocol;
 151         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 152         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 153         fl.fl6_flowlabel = np->flow_label;
 154         IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
 155         fl.oif = sk->sk_bound_dev_if;
 156         fl.fl_ip_sport = inet->sport;
 157         fl.fl_ip_dport = inet->dport;
 158         security_sk_classify_flow(sk, &fl);
 159
 160         if (np->opt && np->opt->srcrt) {
 161                 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 162                 ipv6_addr_copy(&final, &fl.fl6_dst);
 163                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 164                 final_p = &final;
 165         }
 166
 167         dst = __sk_dst_check(sk, np->dst_cookie);
 168
 169         if (dst == NULL) {
 170                 int err = ip6_dst_lookup(sk, &dst, &fl);
 171
 172                 if (err) {
 173                         sk->sk_err_soft = -err;
 174                         kfree_skb(skb);
 175                         return err;
 176                 }
 177
 178                 if (final_p)
 179                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 180
 181                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 182                         sk->sk_route_caps = 0;
 183                         kfree_skb(skb);
 184                         return err;
 185                 }
 186
 187                 __ip6_dst_store(sk, dst, NULL, NULL);
 188         }
 189
 190         skb->dst = dst_clone(dst);
 191
 192         /* Restore final destination back after routing done */
 193         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 194
 195         return ip6_xmit(sk, skb, &fl, np->opt, 0);
 196 }
 197
 198 EXPORT_SYMBOL_GPL(inet6_csk_xmit);