/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* Support for INET6 connection oriented protocols.
*
* Authors: See the TCPv6 sources
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or(at your option) any later version.
*/
#include <linux/module.h>
#include <linux/in6.h>
#include <linux/ipv6.h>
#include <linux/jhash.h>
#include <net/addrconf.h>
#include <net/inet_connection_sock.h>
#include <net/inet_ecn.h>
#include <net/inet_hashtables.h>
#include <net/ip6_route.h>
#include <net/sock.h>
#include <net/inet6_connection_sock.h>
int inet6_csk_bind_conflict(const struct sock *sk,
const struct inet_bind_bucket *tb)
{
const struct sock *sk2;
const struct hlist_node *node;
/* We must walk the whole port owner list in this case. -DaveM */
sk_for_each_bound(sk2, node, &tb->owners) {
if (sk != sk2 &&
(!sk->sk_bound_dev_if ||
!sk2->sk_bound_dev_if ||
sk->sk_bound_dev_if == sk2->sk_bound_dev_if) &&
(!sk->sk_reuse || !sk2->sk_reuse ||
sk2->sk_state == TCP_LISTEN) &&
ipv6_rcv_saddr_equal(sk, sk2))
break;
}
return node != NULL;
}
EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
/*
* request_sock (formerly open request) hash tables.
*/
static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
const u32 rnd, const u16 synq_hsize)
{
u32 a = (__force u32)raddr->s6_addr32[0];
u32 b = (__force u32)raddr->s6_addr32[1];
u32 c = (__force u32)raddr->s6_addr32[2];
a += JHASH_GOLDEN_RATIO;
b += JHASH_GOLDEN_RATIO;
c += rnd;
__jhash_mix(a, b, c);
a += (__force u32)raddr->s6_addr32[3];
b += (__force u32)rport;
__jhash_mix(a, b, c);
return c & (synq_hsize - 1);
}
struct request_sock *inet6_csk_search_req(const struct sock *sk,
struct request_sock ***prevp,
const __be16 rport,
const struct in6_addr *raddr,
const struct in6_addr *laddr,
const int iif)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
struct request_sock *req, **prev;
for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
lopt->hash_rnd,
lopt->nr_table_entries)];
(req = *prev) != NULL;
prev = &req->dl_next) {
const struct inet6_request_sock *treq = inet6_rsk(req);
if (inet_rsk(req)->rmt_port == rport &&
req->rsk_ops->family == AF_INET6 &&
ipv6_addr_equal(&treq->rmt_addr, raddr) &&
ipv6_addr_equal(&treq->loc_addr, laddr) &&
(!treq->iif || treq->iif == iif)) {
BUG_TRAP(req->sk == NULL);
*prevp = prev;
return req;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(inet6_csk_search_req);
void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
struct request_sock *req,
const unsigned long timeout)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
inet_rsk(req)->rmt_port,
lopt->hash_rnd, lopt->nr_table_entries);
reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
inet_csk_reqsk_queue_added(sk, timeout);
}
EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
sin6->sin6_family = AF_INET6;
ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
sin6->sin6_port = inet_sk(sk)->dport;
/* We do not store received flowlabel for TCP */
sin6->sin6_flowinfo = 0;
sin6->sin6_scope_id = 0;
if (sk->sk_bound_dev_if &&
ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
sin6->sin6_scope_id = sk->sk_bound_dev_if;
}
EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
static inline
void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
struct in6_addr *daddr, struct in6_addr *saddr)
{
__ip6_dst_store(sk, dst, daddr, saddr);
#ifdef CONFIG_XFRM
if (dst) {
struct rt6_info *rt = (struct rt6_info *)dst;
rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid);
}
#endif
}
static inline
struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
{
struct dst_entry *dst;
dst = __sk_dst_check(sk, cookie);
#ifdef CONFIG_XFRM
if (dst) {
struct rt6_info *rt = (struct rt6_info *)dst;
if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
sk->sk_dst_cache = NULL;
dst_release(dst);
dst = NULL;
}
}
#endif
return dst;
}
int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
{
struct sock *sk = skb->sk;
struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
struct flowi fl;
struct dst_entry *dst;
struct in6_addr *final_p = NULL, final;
memset(&fl, 0, sizeof(fl));
fl.proto = sk->sk_protocol;
ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
ipv6_addr_copy(&fl.fl6_src, &np->saddr);
fl.fl6_flowlabel = np->flow_label;
IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
fl.oif = sk->sk_bound_dev_if;
fl.fl_ip_sport = inet->sport;
fl.fl_ip_dport = inet->dport;
security_sk_classify_flow(sk, &fl);
if (np->opt && np->opt->srcrt) {
struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
ipv6_addr_copy(&final, &fl.fl6_dst);
ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
final_p = &final;
}
dst = __inet6_csk_dst_check(sk, np->dst_cookie);
if (dst == NULL) {
int err = ip6_dst_lookup(sk, &dst, &fl);
if (err) {
sk->sk_err_soft = -err;
kfree_skb(skb);
return err;
}
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
sk->sk_route_caps = 0;
kfree_skb(skb);
return err;
}
__inet6_csk_dst_store(sk, dst, NULL, NULL);
}
skb->dst = dst_clone(dst);
/* Restore final destination back after routing done */
ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
return ip6_xmit(sk, skb, &fl, np->opt, 0);
}
EXPORT_SYMBOL_GPL(inet6_csk_xmit);
