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![David S. Miller](/assets/img/avatar_default.png)
This allows us to acquire the exact route keying information from the protocol, however that might be managed. It handles all of the possibilities, from the simplest case of storing the key in inet->cork.fl to the more complex setup SCTP has where individual transports determine the flow. Signed-off-by: David S. Miller <davem@davemloft.net>
252 lines
6.8 KiB
C
252 lines
6.8 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)
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{
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const struct sock *sk2;
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const struct hlist_node *node;
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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, node, &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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(!sk->sk_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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return node != 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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const struct request_sock *req)
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{
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struct inet6_request_sock *treq = inet6_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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struct flowi6 fl6;
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memset(&fl6, 0, sizeof(fl6));
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fl6.flowi6_proto = IPPROTO_TCP;
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ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr);
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final_p = fl6_update_dst(&fl6, np->opt, &final);
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ipv6_addr_copy(&fl6.saddr, &treq->loc_addr);
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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_dport = inet_rsk(req)->rmt_port;
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fl6.fl6_sport = inet_rsk(req)->loc_port;
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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, false);
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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 u16 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(const struct sock *sk,
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struct request_sock ***prevp,
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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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const 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, **prev;
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for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
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lopt->hash_rnd,
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lopt->nr_table_entries)];
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(req = *prev) != NULL;
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prev = &req->dl_next) {
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const struct inet6_request_sock *treq = inet6_rsk(req);
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if (inet_rsk(req)->rmt_port == rport &&
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req->rsk_ops->family == AF_INET6 &&
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ipv6_addr_equal(&treq->rmt_addr, raddr) &&
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ipv6_addr_equal(&treq->loc_addr, laddr) &&
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(!treq->iif || treq->iif == iif)) {
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WARN_ON(req->sk != NULL);
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*prevp = prev;
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return req;
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}
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}
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return NULL;
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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(&inet6_rsk(req)->rmt_addr,
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inet_rsk(req)->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 ipv6_pinfo *np = inet6_sk(sk);
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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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ipv6_addr_copy(&sin6->sin6_addr, &np->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 = 0;
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if (sk->sk_bound_dev_if &&
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ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
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sin6->sin6_scope_id = 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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struct in6_addr *daddr, struct in6_addr *saddr)
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{
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__ip6_dst_store(sk, dst, daddr, saddr);
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#ifdef CONFIG_XFRM
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{
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struct rt6_info *rt = (struct rt6_info *)dst;
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rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid);
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}
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#endif
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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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struct dst_entry *dst;
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dst = __sk_dst_check(sk, cookie);
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#ifdef CONFIG_XFRM
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if (dst) {
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struct rt6_info *rt = (struct rt6_info *)dst;
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if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
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__sk_dst_reset(sk);
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dst = NULL;
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}
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}
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#endif
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return dst;
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}
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int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
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{
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struct sock *sk = skb->sk;
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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 flowi6 fl6;
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struct dst_entry *dst;
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struct in6_addr *final_p, final;
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memset(&fl6, 0, sizeof(fl6));
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fl6.flowi6_proto = sk->sk_protocol;
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ipv6_addr_copy(&fl6.daddr, &np->daddr);
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ipv6_addr_copy(&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 == NULL) {
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dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
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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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__inet6_csk_dst_store(sk, dst, NULL, NULL);
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}
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skb_dst_set(skb, dst_clone(dst));
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/* Restore final destination back after routing done */
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ipv6_addr_copy(&fl6.daddr, &np->daddr);
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return ip6_xmit(sk, skb, &fl6, np->opt);
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}
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EXPORT_SYMBOL_GPL(inet6_csk_xmit);
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