262 lines
7.3 KiB
C
262 lines
7.3 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Support for INET6 connection oriented protocols.
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*
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* Authors: See the TCPv6 sources
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or(at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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#include <linux/jhash.h>
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#include <linux/slab.h>
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#include <net/addrconf.h>
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#include <net/inet_connection_sock.h>
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#include <net/inet_ecn.h>
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#include <net/inet_hashtables.h>
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#include <net/ip6_route.h>
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#include <net/sock.h>
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#include <net/inet6_connection_sock.h>
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int inet6_csk_bind_conflict(const struct sock *sk,
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const struct inet_bind_bucket *tb, bool relax)
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{
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const struct sock *sk2;
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int reuse = sk->sk_reuse;
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int reuseport = sk->sk_reuseport;
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kuid_t uid = sock_i_uid((struct sock *)sk);
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/* We must walk the whole port owner list in this case. -DaveM */
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/*
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* See comment in inet_csk_bind_conflict about sock lookup
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* vs net namespaces issues.
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*/
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sk_for_each_bound(sk2, &tb->owners) {
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if (sk != sk2 &&
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(!sk->sk_bound_dev_if ||
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!sk2->sk_bound_dev_if ||
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sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
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if ((!reuse || !sk2->sk_reuse ||
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sk2->sk_state == TCP_LISTEN) &&
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(!reuseport || !sk2->sk_reuseport ||
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(sk2->sk_state != TCP_TIME_WAIT &&
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!uid_eq(uid,
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sock_i_uid((struct sock *)sk2))))) {
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if (ipv6_rcv_saddr_equal(sk, sk2))
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break;
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}
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if (!relax && reuse && sk2->sk_reuse &&
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sk2->sk_state != TCP_LISTEN &&
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ipv6_rcv_saddr_equal(sk, sk2))
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break;
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}
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}
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return sk2 != NULL;
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}
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EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
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struct dst_entry *inet6_csk_route_req(struct sock *sk,
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struct flowi6 *fl6,
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const struct request_sock *req)
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{
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struct inet_request_sock *ireq = inet_rsk(req);
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct in6_addr *final_p, final;
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struct dst_entry *dst;
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memset(fl6, 0, sizeof(*fl6));
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fl6->flowi6_proto = IPPROTO_TCP;
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fl6->daddr = ireq->ir_v6_rmt_addr;
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final_p = fl6_update_dst(fl6, np->opt, &final);
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fl6->saddr = ireq->ir_v6_loc_addr;
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fl6->flowi6_oif = ireq->ir_iif;
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fl6->flowi6_mark = ireq->ir_mark;
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fl6->fl6_dport = ireq->ir_rmt_port;
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fl6->fl6_sport = htons(ireq->ir_num);
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security_req_classify_flow(req, flowi6_to_flowi(fl6));
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dst = ip6_dst_lookup_flow(sk, fl6, final_p);
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if (IS_ERR(dst))
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return NULL;
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return dst;
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}
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/*
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* request_sock (formerly open request) hash tables.
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*/
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static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
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const u32 rnd, const u32 synq_hsize)
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{
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u32 c;
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c = jhash_3words((__force u32)raddr->s6_addr32[0],
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(__force u32)raddr->s6_addr32[1],
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(__force u32)raddr->s6_addr32[2],
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rnd);
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c = jhash_2words((__force u32)raddr->s6_addr32[3],
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(__force u32)rport,
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c);
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return c & (synq_hsize - 1);
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}
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struct request_sock *inet6_csk_search_req(struct sock *sk,
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const __be16 rport,
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const struct in6_addr *raddr,
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const struct in6_addr *laddr,
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const int iif)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
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struct request_sock *req;
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u32 hash = inet6_synq_hash(raddr, rport, lopt->hash_rnd,
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lopt->nr_table_entries);
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spin_lock(&icsk->icsk_accept_queue.syn_wait_lock);
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for (req = lopt->syn_table[hash]; req != NULL; req = req->dl_next) {
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const struct inet_request_sock *ireq = inet_rsk(req);
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if (ireq->ir_rmt_port == rport &&
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req->rsk_ops->family == AF_INET6 &&
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ipv6_addr_equal(&ireq->ir_v6_rmt_addr, raddr) &&
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ipv6_addr_equal(&ireq->ir_v6_loc_addr, laddr) &&
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(!ireq->ir_iif || ireq->ir_iif == iif)) {
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atomic_inc(&req->rsk_refcnt);
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WARN_ON(req->sk != NULL);
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break;
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}
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}
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spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock);
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return req;
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}
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EXPORT_SYMBOL_GPL(inet6_csk_search_req);
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void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
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struct request_sock *req,
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const unsigned long timeout)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
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const u32 h = inet6_synq_hash(&inet_rsk(req)->ir_v6_rmt_addr,
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inet_rsk(req)->ir_rmt_port,
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lopt->hash_rnd, lopt->nr_table_entries);
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reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
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inet_csk_reqsk_queue_added(sk, timeout);
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}
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EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
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void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
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{
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
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sin6->sin6_family = AF_INET6;
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sin6->sin6_addr = sk->sk_v6_daddr;
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sin6->sin6_port = inet_sk(sk)->inet_dport;
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/* We do not store received flowlabel for TCP */
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sin6->sin6_flowinfo = 0;
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sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
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sk->sk_bound_dev_if);
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}
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EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
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static inline
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void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
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const struct in6_addr *daddr,
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const struct in6_addr *saddr)
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{
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__ip6_dst_store(sk, dst, daddr, saddr);
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}
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static inline
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struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
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{
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return __sk_dst_check(sk, cookie);
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}
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static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
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struct flowi6 *fl6)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct in6_addr *final_p, final;
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struct dst_entry *dst;
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memset(fl6, 0, sizeof(*fl6));
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fl6->flowi6_proto = sk->sk_protocol;
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fl6->daddr = sk->sk_v6_daddr;
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fl6->saddr = np->saddr;
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fl6->flowlabel = np->flow_label;
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IP6_ECN_flow_xmit(sk, fl6->flowlabel);
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fl6->flowi6_oif = sk->sk_bound_dev_if;
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fl6->flowi6_mark = sk->sk_mark;
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fl6->fl6_sport = inet->inet_sport;
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fl6->fl6_dport = inet->inet_dport;
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security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
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final_p = fl6_update_dst(fl6, np->opt, &final);
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dst = __inet6_csk_dst_check(sk, np->dst_cookie);
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if (!dst) {
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dst = ip6_dst_lookup_flow(sk, fl6, final_p);
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if (!IS_ERR(dst))
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__inet6_csk_dst_store(sk, dst, NULL, NULL);
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}
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return dst;
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}
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int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct flowi6 fl6;
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struct dst_entry *dst;
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int res;
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dst = inet6_csk_route_socket(sk, &fl6);
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if (IS_ERR(dst)) {
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sk->sk_err_soft = -PTR_ERR(dst);
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sk->sk_route_caps = 0;
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kfree_skb(skb);
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return PTR_ERR(dst);
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}
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rcu_read_lock();
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skb_dst_set_noref(skb, dst);
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/* Restore final destination back after routing done */
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fl6.daddr = sk->sk_v6_daddr;
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res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
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rcu_read_unlock();
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return res;
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}
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EXPORT_SYMBOL_GPL(inet6_csk_xmit);
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struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
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{
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struct flowi6 fl6;
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struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
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if (IS_ERR(dst))
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return NULL;
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dst->ops->update_pmtu(dst, sk, NULL, mtu);
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dst = inet6_csk_route_socket(sk, &fl6);
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return IS_ERR(dst) ? NULL : dst;
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}
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EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);
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