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
  30int inet6_csk_bind_conflict(const struct sock *sk,
  31                            const struct inet_bind_bucket *tb)
  32{
  33        const struct sock *sk2;
  34        const struct hlist_node *node;
  35
  36        /* We must walk the whole port owner list in this case. -DaveM */
  37        /*
  38         * See comment in inet_csk_bind_conflict about sock lookup
  39         * vs net namespaces issues.
  40         */
  41        sk_for_each_bound(sk2, node, &tb->owners) {
  42                if (sk != sk2 &&
  43                    (!sk->sk_bound_dev_if ||
  44                     !sk2->sk_bound_dev_if ||
  45                     sk->sk_bound_dev_if == sk2->sk_bound_dev_if) &&
  46                    (!sk->sk_reuse || !sk2->sk_reuse ||
  47                     sk2->sk_state == TCP_LISTEN) &&
  48                     ipv6_rcv_saddr_equal(sk, sk2))
  49                        break;
  50        }
  51
  52        return node != NULL;
  53}
  54
  55EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
  56
  57/*
  58 * request_sock (formerly open request) hash tables.
  59 */
  60static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
  61                           const u32 rnd, const u16 synq_hsize)
  62{
  63        u32 a = (__force u32)raddr->s6_addr32[0];
  64        u32 b = (__force u32)raddr->s6_addr32[1];
  65        u32 c = (__force u32)raddr->s6_addr32[2];
  66
  67        a += JHASH_GOLDEN_RATIO;
  68        b += JHASH_GOLDEN_RATIO;
  69        c += rnd;
  70        __jhash_mix(a, b, c);
  71
  72        a += (__force u32)raddr->s6_addr32[3];
  73        b += (__force u32)rport;
  74        __jhash_mix(a, b, c);
  75
  76        return c & (synq_hsize - 1);
  77}
  78
  79struct request_sock *inet6_csk_search_req(const struct sock *sk,
  80                                          struct request_sock ***prevp,
  81                                          const __be16 rport,
  82                                          const struct in6_addr *raddr,
  83                                          const struct in6_addr *laddr,
  84                                          const int iif)
  85{
  86        const struct inet_connection_sock *icsk = inet_csk(sk);
  87        struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
  88        struct request_sock *req, **prev;
  89
  90        for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
  91                                                     lopt->hash_rnd,
  92                                                     lopt->nr_table_entries)];
  93             (req = *prev) != NULL;
  94             prev = &req->dl_next) {
  95                const struct inet6_request_sock *treq = inet6_rsk(req);
  96
  97                if (inet_rsk(req)->rmt_port == rport &&
  98                    req->rsk_ops->family == AF_INET6 &&
  99                    ipv6_addr_equal(&treq->rmt_addr, raddr) &&
 100                    ipv6_addr_equal(&treq->loc_addr, laddr) &&
 101                    (!treq->iif || treq->iif == iif)) {
 102                        WARN_ON(req->sk != NULL);
 103                        *prevp = prev;
 104                        return req;
 105                }
 106        }
 107
 108        return NULL;
 109}
 110
 111EXPORT_SYMBOL_GPL(inet6_csk_search_req);
 112
 113void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
 114                                    struct request_sock *req,
 115                                    const unsigned long timeout)
 116{
 117        struct inet_connection_sock *icsk = inet_csk(sk);
 118        struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
 119        const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
 120                                      inet_rsk(req)->rmt_port,
 121                                      lopt->hash_rnd, lopt->nr_table_entries);
 122
 123        reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
 124        inet_csk_reqsk_queue_added(sk, timeout);
 125}
 126
 127EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
 128
 129void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
 130{
 131        struct ipv6_pinfo *np = inet6_sk(sk);
 132        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
 133
 134        sin6->sin6_family = AF_INET6;
 135        ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
 136        sin6->sin6_port = inet_sk(sk)->inet_dport;
 137        /* We do not store received flowlabel for TCP */
 138        sin6->sin6_flowinfo = 0;
 139        sin6->sin6_scope_id = 0;
 140        if (sk->sk_bound_dev_if &&
 141            ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 142                sin6->sin6_scope_id = sk->sk_bound_dev_if;
 143}
 144
 145EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
 146
 147static inline
 148void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
 149                           struct in6_addr *daddr, struct in6_addr *saddr)
 150{
 151        __ip6_dst_store(sk, dst, daddr, saddr);
 152
 153#ifdef CONFIG_XFRM
 154        {
 155                struct rt6_info *rt = (struct rt6_info  *)dst;
 156                rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid);
 157        }
 158#endif
 159}
 160
 161static inline
 162struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
 163{
 164        struct dst_entry *dst;
 165
 166        dst = __sk_dst_check(sk, cookie);
 167
 168#ifdef CONFIG_XFRM
 169        if (dst) {
 170                struct rt6_info *rt = (struct rt6_info *)dst;
 171                if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
 172                        __sk_dst_reset(sk);
 173                        dst = NULL;
 174                }
 175        }
 176#endif
 177
 178        return dst;
 179}
 180
 181int inet6_csk_xmit(struct sk_buff *skb)
 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, 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.mark = sk->sk_mark;
 198        fl.fl_ip_sport = inet->inet_sport;
 199        fl.fl_ip_dport = inet->inet_dport;
 200        security_sk_classify_flow(sk, &fl);
 201
 202        final_p = fl6_update_dst(&fl, np->opt, &final);
 203
 204        dst = __inet6_csk_dst_check(sk, np->dst_cookie);
 205
 206        if (dst == NULL) {
 207                int err = ip6_dst_lookup(sk, &dst, &fl);
 208
 209                if (err) {
 210                        sk->sk_err_soft = -err;
 211                        kfree_skb(skb);
 212                        return err;
 213                }
 214
 215                if (final_p)
 216                        ipv6_addr_copy(&fl.fl6_dst, final_p);
 217
 218                if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
 219                        sk->sk_route_caps = 0;
 220                        kfree_skb(skb);
 221                        return err;
 222                }
 223
 224                __inet6_csk_dst_store(sk, dst, NULL, NULL);
 225        }
 226
 227        skb_dst_set(skb, dst_clone(dst));
 228
 229        /* Restore final destination back after routing done */
 230        ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 231
 232        return ip6_xmit(sk, skb, &fl, np->opt);
 233}
 234
 235EXPORT_SYMBOL_GPL(inet6_csk_xmit);
 236