155 lines
4.2 KiB
C
155 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* 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
|
|
*/
|
|
|
|
#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>
|
|
#include <net/sock_reuseport.h>
|
|
|
|
struct dst_entry *inet6_csk_route_req(const struct sock *sk,
|
|
struct flowi6 *fl6,
|
|
const struct request_sock *req,
|
|
u8 proto)
|
|
{
|
|
struct inet_request_sock *ireq = inet_rsk(req);
|
|
const 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 = proto;
|
|
fl6->daddr = ireq->ir_v6_rmt_addr;
|
|
rcu_read_lock();
|
|
final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
|
|
rcu_read_unlock();
|
|
fl6->saddr = ireq->ir_v6_loc_addr;
|
|
fl6->flowi6_oif = ireq->ir_iif;
|
|
fl6->flowi6_mark = ireq->ir_mark;
|
|
fl6->fl6_dport = ireq->ir_rmt_port;
|
|
fl6->fl6_sport = htons(ireq->ir_num);
|
|
fl6->flowi6_uid = sk->sk_uid;
|
|
security_req_classify_flow(req, flowi6_to_flowi_common(fl6));
|
|
|
|
dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
|
|
if (IS_ERR(dst))
|
|
return NULL;
|
|
|
|
return dst;
|
|
}
|
|
EXPORT_SYMBOL(inet6_csk_route_req);
|
|
|
|
void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
|
|
{
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
|
|
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_addr = sk->sk_v6_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 = ipv6_iface_scope_id(&sin6->sin6_addr,
|
|
sk->sk_bound_dev_if);
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
|
|
|
|
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 = sk->sk_v6_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;
|
|
fl6->flowi6_uid = sk->sk_uid;
|
|
security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
|
|
|
|
rcu_read_lock();
|
|
final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
|
|
rcu_read_unlock();
|
|
|
|
dst = __inet6_csk_dst_check(sk, np->dst_cookie);
|
|
if (!dst) {
|
|
dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
|
|
|
|
if (!IS_ERR(dst))
|
|
ip6_dst_store(sk, dst, NULL, NULL);
|
|
}
|
|
return dst;
|
|
}
|
|
|
|
int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
|
|
{
|
|
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 = sk->sk_v6_daddr;
|
|
|
|
res = ip6_xmit(sk, skb, &fl6, sk->sk_mark, rcu_dereference(np->opt),
|
|
np->tclass, sk->sk_priority);
|
|
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, true);
|
|
|
|
dst = inet6_csk_route_socket(sk, &fl6);
|
|
return IS_ERR(dst) ? NULL : dst;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);
|