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
  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
  29int 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        /*
  37         * See comment in inet_csk_bind_conflict about sock lookup
  38         * vs net namespaces issues.
  39         */
  40        sk_for_each_bound(sk2, node, &tb->owners) {
  41                if (sk != sk2 &&
  42                    (!sk->sk_bound_dev_if ||
  43                     !sk2->sk_bound_dev_if ||
  44                     sk->sk_bound_dev_if == sk2->sk_bound_dev_if) &&
  45                    (!sk->sk_reuse || !sk2->sk_reuse ||
  46                     sk2->sk_state == TCP_LISTEN) &&
  47                     ipv6_rcv_saddr_equal(sk, sk2))
  48                        break;
  49        }
  50
  51        return node != NULL;
  52}
  53
  54EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
  55
  56/*
  57 * request_sock (formerly open request) hash tables.
  58 */
  59static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
  60                           const u32 rnd, const u16 synq_hsize)
  61{
  62        u32 a = (__force u32)raddr->s6_addr32[0];
  63        u32 b = (__force u32)raddr->s6_addr32[1];
  64        u32 c = (__force u32)raddr->s6_addr32[2];
  65
  66        a += JHASH_GOLDEN_RATIO;
  67        b += JHASH_GOLDEN_RATIO;
  68        c += rnd;
  69        __jhash_mix(a, b, c);
  70
  71        a += (__force u32)raddr->s6_addr32[3];
  72        b += (__force u32)rport;
  73        __jhash_mix(a, b, c);
  74
  75        return c & (synq_hsize - 1);
  76}
  77
  78struct request_sock *inet6_csk_search_req(const struct sock *sk,
  79                                          struct request_sock ***prevp,
  80                                          const __be16 rport,
  81                                          const struct in6_addr *raddr,
  82                                          const struct in6_addr *laddr,
  83                                          const int iif)
  84{
  85        const struct inet_connection_sock *icsk = inet_csk(sk);
  86        struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
  87        struct request_sock *req, **prev;
  88
  89        for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
  90                                                     lopt->hash_rnd,
  91                                                     lopt->nr_table_entries)];
  92             (req = *prev) != NULL;
  93             prev = &req->dl_next) {
  94                const struct inet6_request_sock *treq = inet6_rsk(req);
  95
  96                if (inet_rsk(req)->rmt_port == rport &&
  97                    req->rsk_ops->family == AF_INET6 &&
  98                    ipv6_addr_equal(&treq->rmt_addr, raddr) &&
  99                    ipv6_addr_equal(&treq->loc_addr, laddr) &&
 100                    (!treq->iif || treq->iif == iif)) {
 101                        WARN_ON(req->sk != NULL);
 102                        *prevp = prev;
 103                        return req;
 104                }
 105        }
 106
 107        return NULL;
 108}
 109
 110EXPORT_SYMBOL_GPL(inet6_csk_search_req);
 111
 112void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
 113                                    struct request_sock *req,
 114                                    const unsigned long timeout)
 115{
 116        struct inet_connection_sock *icsk = inet_csk(sk);
 117        struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
 118        const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
 119                                      inet_rsk(req)->rmt_port,
 120                                      lopt->hash_rnd, lopt->nr_table_entries);
 121
 122        reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
 123        inet_csk_reqsk_queue_added(sk, timeout);
 124}
 125
 126EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
 127
 128void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
 129{
 130        struct ipv6_pinfo *np = inet6_sk(sk);
 131        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
 132
 133        sin6->sin6_family = AF_INET6;
 134        ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
 135        sin6->sin6_port = inet_sk(sk)->dport;
 136        /* We do not store received flowlabel for TCP */
 137        sin6->sin6_flowinfo = 0;
 138        sin6->sin6_scope_id = 0;
 139        if (sk->sk_bound_dev_if &&
 140            ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 141                sin6->sin6_scope_id = sk->sk_bound_dev_if;
 142}
 143
 144EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
 145
 146static inline
 147void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
 148                           struct in6_addr *daddr, struct in6_addr *saddr)
 149{
 150        __ip6_dst_store(sk, dst, daddr, saddr);
 151
 152#ifdef CONFIG_XFRM
 153        {
 154                struct rt6_info *rt = (struct rt6_info  *)dst;
 155                rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid);
 156        }
 157#endif
 158}
 159
 160static inline
 161struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
 162{
 163        struct dst_entry *dst;
 164
 165        dst = __sk_dst_check(sk, cookie);
 166
 167#ifdef CONFIG_XFRM
 168        if (dst) {
 169                struct rt6_info *rt = (struct rt6_info *)dst;
 170                if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
 171                        sk->sk_dst_cache = NULL;
 172                        dst_release(dst);
 173                        dst = NULL;
 174                }
 175        }
 176#endif
 177
 178        return dst;
 179}
 180
 181int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
 182{
 183        struct sock *sk = skb->sk;
 184        struct inet_sock *inet = inet_sk(sk);
 185        struct ipv6_pinfo *np = inet6_sk(sk);
 186        struct flowi fl;
 187        struct dst_entry *dst;
 188        struct in6_addr *final_p = NULL, final;
 189
 190        memset(&fl, 0, sizeof(fl));
 191        fl.proto = sk->sk_protocol;
 192        ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 193        ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 194        fl.fl6_flowlabel = np->flow_label;
 195        IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
 196        fl.oif = sk->sk_bound_dev_if;
 197        fl.fl_ip_sport = inet->sport;
 198        fl.fl_ip_dport = inet->dport;
 199        security_sk_classify_flow(sk, &fl);
 200
 201        if (np->opt && np->opt->srcrt) {
 202                struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 203                ipv6_addr_copy(&final, &fl.fl6_dst);
 204                ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 205                final_p = &final;
 206        }
 207
 208        dst = __inet6_csk_dst_check(sk, np->dst_cookie);
 209
 210        if (dst == NULL) {
 211                int err = ip6_dst_lookup(sk, &dst, &fl);
 212
 213                if (err) {
 214                        sk->sk_err_soft = -err;
 215                        kfree_skb(skb);
 216                        return err;
 217                }
 218
 219                if (final_p)
 220                        ipv6_addr_copy(&fl.fl6_dst, final_p);
 221
 222                if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
 223                        sk->sk_route_caps = 0;
 224                        kfree_skb(skb);
 225                        return err;
 226                }
 227
 228                __inet6_csk_dst_store(sk, dst, NULL, NULL);
 229        }
 230
 231        skb->dst = dst_clone(dst);
 232
 233        /* Restore final destination back after routing done */
 234        ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 235
 236        return ip6_xmit(sk, skb, &fl, np->opt, 0);
 237}
 238
 239EXPORT_SYMBOL_GPL(inet6_csk_xmit);
 240