267 lines
7.2 KiB
C
267 lines
7.2 KiB
C
/*
|
|
* 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 <linux/slab.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, bool relax)
|
|
{
|
|
const struct sock *sk2;
|
|
int reuse = sk->sk_reuse;
|
|
int reuseport = sk->sk_reuseport;
|
|
kuid_t uid = sock_i_uid((struct sock *)sk);
|
|
|
|
/* We must walk the whole port owner list in this case. -DaveM */
|
|
/*
|
|
* See comment in inet_csk_bind_conflict about sock lookup
|
|
* vs net namespaces issues.
|
|
*/
|
|
sk_for_each_bound(sk2, &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)) {
|
|
if ((!reuse || !sk2->sk_reuse ||
|
|
sk2->sk_state == TCP_LISTEN) &&
|
|
(!reuseport || !sk2->sk_reuseport ||
|
|
(sk2->sk_state != TCP_TIME_WAIT &&
|
|
!uid_eq(uid,
|
|
sock_i_uid((struct sock *)sk2))))) {
|
|
if (ipv6_rcv_saddr_equal(sk, sk2))
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return sk2 != NULL;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
|
|
|
|
struct dst_entry *inet6_csk_route_req(struct sock *sk,
|
|
struct flowi6 *fl6,
|
|
const struct request_sock *req)
|
|
{
|
|
struct inet6_request_sock *treq = inet6_rsk(req);
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct in6_addr *final_p, final;
|
|
struct dst_entry *dst;
|
|
|
|
memset(fl6, 0, sizeof(*fl6));
|
|
fl6->flowi6_proto = IPPROTO_TCP;
|
|
fl6->daddr = treq->rmt_addr;
|
|
final_p = fl6_update_dst(fl6, np->opt, &final);
|
|
fl6->saddr = treq->loc_addr;
|
|
fl6->flowi6_oif = treq->iif;
|
|
fl6->flowi6_mark = sk->sk_mark;
|
|
fl6->fl6_dport = inet_rsk(req)->rmt_port;
|
|
fl6->fl6_sport = inet_rsk(req)->loc_port;
|
|
security_req_classify_flow(req, flowi6_to_flowi(fl6));
|
|
|
|
dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
|
|
if (IS_ERR(dst))
|
|
return NULL;
|
|
|
|
return dst;
|
|
}
|
|
|
|
/*
|
|
* request_sock (formerly open request) hash tables.
|
|
*/
|
|
static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
|
|
const u32 rnd, const u32 synq_hsize)
|
|
{
|
|
u32 c;
|
|
|
|
c = jhash_3words((__force u32)raddr->s6_addr32[0],
|
|
(__force u32)raddr->s6_addr32[1],
|
|
(__force u32)raddr->s6_addr32[2],
|
|
rnd);
|
|
|
|
c = jhash_2words((__force u32)raddr->s6_addr32[3],
|
|
(__force u32)rport,
|
|
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)) {
|
|
WARN_ON(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;
|
|
sin6->sin6_addr = np->daddr;
|
|
sin6->sin6_port = inet_sk(sk)->inet_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,
|
|
const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr)
|
|
{
|
|
__ip6_dst_store(sk, dst, daddr, saddr);
|
|
}
|
|
|
|
static inline
|
|
struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
|
|
{
|
|
return __sk_dst_check(sk, cookie);
|
|
}
|
|
|
|
static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
|
|
struct flowi6 *fl6)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct in6_addr *final_p, final;
|
|
struct dst_entry *dst;
|
|
|
|
memset(fl6, 0, sizeof(*fl6));
|
|
fl6->flowi6_proto = sk->sk_protocol;
|
|
fl6->daddr = np->daddr;
|
|
fl6->saddr = np->saddr;
|
|
fl6->flowlabel = np->flow_label;
|
|
IP6_ECN_flow_xmit(sk, fl6->flowlabel);
|
|
fl6->flowi6_oif = sk->sk_bound_dev_if;
|
|
fl6->flowi6_mark = sk->sk_mark;
|
|
fl6->fl6_sport = inet->inet_sport;
|
|
fl6->fl6_dport = inet->inet_dport;
|
|
security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
|
|
|
|
final_p = fl6_update_dst(fl6, np->opt, &final);
|
|
|
|
dst = __inet6_csk_dst_check(sk, np->dst_cookie);
|
|
if (!dst) {
|
|
dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
|
|
|
|
if (!IS_ERR(dst))
|
|
__inet6_csk_dst_store(sk, dst, NULL, NULL);
|
|
}
|
|
return dst;
|
|
}
|
|
|
|
int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
|
|
{
|
|
struct sock *sk = skb->sk;
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct flowi6 fl6;
|
|
struct dst_entry *dst;
|
|
int res;
|
|
|
|
dst = inet6_csk_route_socket(sk, &fl6);
|
|
if (IS_ERR(dst)) {
|
|
sk->sk_err_soft = -PTR_ERR(dst);
|
|
sk->sk_route_caps = 0;
|
|
kfree_skb(skb);
|
|
return PTR_ERR(dst);
|
|
}
|
|
|
|
rcu_read_lock();
|
|
skb_dst_set_noref(skb, dst);
|
|
|
|
/* Restore final destination back after routing done */
|
|
fl6.daddr = np->daddr;
|
|
|
|
res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
|
|
rcu_read_unlock();
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet6_csk_xmit);
|
|
|
|
struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
|
|
{
|
|
struct flowi6 fl6;
|
|
struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
|
|
|
|
if (IS_ERR(dst))
|
|
return NULL;
|
|
dst->ops->update_pmtu(dst, sk, NULL, mtu);
|
|
|
|
dst = inet6_csk_route_socket(sk, &fl6);
|
|
return IS_ERR(dst) ? NULL : dst;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);
|