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, bool relax)
  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
  57struct dst_entry *inet6_csk_route_req(struct sock *sk,
  58                                      struct flowi6 *fl6,
  59                                      const struct request_sock *req)
  60{
  61        struct inet6_request_sock *treq = inet6_rsk(req);
  62        struct ipv6_pinfo *np = inet6_sk(sk);
  63        struct in6_addr *final_p, final;
  64        struct dst_entry *dst;
  65
  66        memset(fl6, 0, sizeof(*fl6));
  67        fl6->flowi6_proto = IPPROTO_TCP;
  68        fl6->daddr = treq->rmt_addr;
  69        final_p = fl6_update_dst(fl6, np->opt, &final);
  70        fl6->saddr = treq->loc_addr;
  71        fl6->flowi6_oif = treq->iif;
  72        fl6->flowi6_mark = sk->sk_mark;
  73        fl6->fl6_dport = inet_rsk(req)->rmt_port;
  74        fl6->fl6_sport = inet_rsk(req)->loc_port;
  75        security_req_classify_flow(req, flowi6_to_flowi(fl6));
  76
  77        dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
  78        if (IS_ERR(dst))
  79                return NULL;
  80
  81        return dst;
  82}
  83
  84/*
  85 * request_sock (formerly open request) hash tables.
  86 */
  87static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
  88                           const u32 rnd, const u32 synq_hsize)
  89{
  90        u32 c;
  91
  92        c = jhash_3words((__force u32)raddr->s6_addr32[0],
  93                         (__force u32)raddr->s6_addr32[1],
  94                         (__force u32)raddr->s6_addr32[2],
  95                         rnd);
  96
  97        c = jhash_2words((__force u32)raddr->s6_addr32[3],
  98                         (__force u32)rport,
  99                         c);
 100
 101        return c & (synq_hsize - 1);
 102}
 103
 104struct request_sock *inet6_csk_search_req(const struct sock *sk,
 105                                          struct request_sock ***prevp,
 106                                          const __be16 rport,
 107                                          const struct in6_addr *raddr,
 108                                          const struct in6_addr *laddr,
 109                                          const int iif)
 110{
 111        const struct inet_connection_sock *icsk = inet_csk(sk);
 112        struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
 113        struct request_sock *req, **prev;
 114
 115        for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
 116                                                     lopt->hash_rnd,
 117                                                     lopt->nr_table_entries)];
 118             (req = *prev) != NULL;
 119             prev = &req->dl_next) {
 120                const struct inet6_request_sock *treq = inet6_rsk(req);
 121
 122                if (inet_rsk(req)->rmt_port == rport &&
 123                    req->rsk_ops->family == AF_INET6 &&
 124                    ipv6_addr_equal(&treq->rmt_addr, raddr) &&
 125                    ipv6_addr_equal(&treq->loc_addr, laddr) &&
 126                    (!treq->iif || treq->iif == iif)) {
 127                        WARN_ON(req->sk != NULL);
 128                        *prevp = prev;
 129                        return req;
 130                }
 131        }
 132
 133        return NULL;
 134}
 135
 136EXPORT_SYMBOL_GPL(inet6_csk_search_req);
 137
 138void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
 139                                    struct request_sock *req,
 140                                    const unsigned long timeout)
 141{
 142        struct inet_connection_sock *icsk = inet_csk(sk);
 143        struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
 144        const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
 145                                      inet_rsk(req)->rmt_port,
 146                                      lopt->hash_rnd, lopt->nr_table_entries);
 147
 148        reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
 149        inet_csk_reqsk_queue_added(sk, timeout);
 150}
 151
 152EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
 153
 154void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
 155{
 156        struct ipv6_pinfo *np = inet6_sk(sk);
 157        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
 158
 159        sin6->sin6_family = AF_INET6;
 160        sin6->sin6_addr = np->daddr;
 161        sin6->sin6_port = inet_sk(sk)->inet_dport;
 162        /* We do not store received flowlabel for TCP */
 163        sin6->sin6_flowinfo = 0;
 164        sin6->sin6_scope_id = 0;
 165        if (sk->sk_bound_dev_if &&
 166            ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 167                sin6->sin6_scope_id = sk->sk_bound_dev_if;
 168}
 169
 170EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
 171
 172static inline
 173void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
 174                           const struct in6_addr *daddr,
 175                           const struct in6_addr *saddr)
 176{
 177        __ip6_dst_store(sk, dst, daddr, saddr);
 178}
 179
 180static inline
 181struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
 182{
 183        return __sk_dst_check(sk, cookie);
 184}
 185
 186static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
 187                                                struct flowi6 *fl6)
 188{
 189        struct inet_sock *inet = inet_sk(sk);
 190        struct ipv6_pinfo *np = inet6_sk(sk);
 191        struct in6_addr *final_p, final;
 192        struct dst_entry *dst;
 193
 194        memset(fl6, 0, sizeof(*fl6));
 195        fl6->flowi6_proto = sk->sk_protocol;
 196        fl6->daddr = np->daddr;
 197        fl6->saddr = np->saddr;
 198        fl6->flowlabel = np->flow_label;
 199        IP6_ECN_flow_xmit(sk, fl6->flowlabel);
 200        fl6->flowi6_oif = sk->sk_bound_dev_if;
 201        fl6->flowi6_mark = sk->sk_mark;
 202        fl6->fl6_sport = inet->inet_sport;
 203        fl6->fl6_dport = inet->inet_dport;
 204        security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
 205
 206        final_p = fl6_update_dst(fl6, np->opt, &final);
 207
 208        dst = __inet6_csk_dst_check(sk, np->dst_cookie);
 209        if (!dst) {
 210                dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
 211
 212                if (!IS_ERR(dst))
 213                        __inet6_csk_dst_store(sk, dst, NULL, NULL);
 214        }
 215        return dst;
 216}
 217
 218int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
 219{
 220        struct sock *sk = skb->sk;
 221        struct ipv6_pinfo *np = inet6_sk(sk);
 222        struct flowi6 fl6;
 223        struct dst_entry *dst;
 224        int res;
 225
 226        dst = inet6_csk_route_socket(sk, &fl6);
 227        if (IS_ERR(dst)) {
 228                sk->sk_err_soft = -PTR_ERR(dst);
 229                sk->sk_route_caps = 0;
 230                kfree_skb(skb);
 231                return PTR_ERR(dst);
 232        }
 233
 234        rcu_read_lock();
 235        skb_dst_set_noref(skb, dst);
 236
 237        /* Restore final destination back after routing done */
 238        fl6.daddr = np->daddr;
 239
 240        res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
 241        rcu_read_unlock();
 242        return res;
 243}
 244EXPORT_SYMBOL_GPL(inet6_csk_xmit);
 245
 246struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
 247{
 248        struct flowi6 fl6;
 249        struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
 250
 251        if (IS_ERR(dst))
 252                return NULL;
 253        dst->ops->update_pmtu(dst, sk, NULL, mtu);
 254
 255        return inet6_csk_route_socket(sk, &fl6);
 256}
 257EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);
 258
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