Esempio n. 1
0
File: ipv4.c Progetto: Lyude/linux
/*
 * The three way handshake has completed - we got a valid ACK or DATAACK -
 * now create the new socket.
 *
 * This is the equivalent of TCP's tcp_v4_syn_recv_sock
 */
struct sock *dccp_v4_request_recv_sock(const struct sock *sk,
				       struct sk_buff *skb,
				       struct request_sock *req,
				       struct dst_entry *dst,
				       struct request_sock *req_unhash,
				       bool *own_req)
{
	struct inet_request_sock *ireq;
	struct inet_sock *newinet;
	struct sock *newsk;

	if (sk_acceptq_is_full(sk))
		goto exit_overflow;

	newsk = dccp_create_openreq_child(sk, req, skb);
	if (newsk == NULL)
		goto exit_nonewsk;

	newinet		   = inet_sk(newsk);
	ireq		   = inet_rsk(req);
	sk_daddr_set(newsk, ireq->ir_rmt_addr);
	sk_rcv_saddr_set(newsk, ireq->ir_loc_addr);
	newinet->inet_saddr	= ireq->ir_loc_addr;
	RCU_INIT_POINTER(newinet->inet_opt, rcu_dereference(ireq->ireq_opt));
	newinet->mc_index  = inet_iif(skb);
	newinet->mc_ttl	   = ip_hdr(skb)->ttl;
	newinet->inet_id   = jiffies;

	if (dst == NULL && (dst = inet_csk_route_child_sock(sk, newsk, req)) == NULL)
		goto put_and_exit;

	sk_setup_caps(newsk, dst);

	dccp_sync_mss(newsk, dst_mtu(dst));

	if (__inet_inherit_port(sk, newsk) < 0)
		goto put_and_exit;
	*own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
	if (*own_req)
		ireq->ireq_opt = NULL;
	else
		newinet->inet_opt = NULL;
	return newsk;

exit_overflow:
	__NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
exit_nonewsk:
	dst_release(dst);
exit:
	__NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS);
	return NULL;
put_and_exit:
	newinet->inet_opt = NULL;
	inet_csk_prepare_forced_close(newsk);
	dccp_done(newsk);
	goto exit;
}
Esempio n. 2
0
/*
 * The three way handshake has completed - we got a valid ACK or DATAACK -
 * now create the new socket.
 *
 * This is the equivalent of TCP's tcp_v4_syn_recv_sock
 */
struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb,
				       struct request_sock *req,
				       struct dst_entry *dst)
{
	struct inet_request_sock *ireq;
	struct inet_sock *newinet;
	struct sock *newsk;

	if (sk_acceptq_is_full(sk))
		goto exit_overflow;

	newsk = dccp_create_openreq_child(sk, req, skb);
	if (newsk == NULL)
		goto exit_nonewsk;

	newinet		   = inet_sk(newsk);
	ireq		   = inet_rsk(req);
	newinet->inet_daddr	= ireq->rmt_addr;
	newinet->inet_rcv_saddr = ireq->loc_addr;
	newinet->inet_saddr	= ireq->loc_addr;
	newinet->inet_opt	= ireq->opt;
	ireq->opt	   = NULL;
	newinet->mc_index  = inet_iif(skb);
	newinet->mc_ttl	   = ip_hdr(skb)->ttl;
	newinet->inet_id   = jiffies;

	if (dst == NULL && (dst = inet_csk_route_child_sock(sk, newsk, req)) == NULL)
		goto put_and_exit;

	sk_setup_caps(newsk, dst);

	dccp_sync_mss(newsk, dst_mtu(dst));

	if (__inet_inherit_port(sk, newsk) < 0)
		goto put_and_exit;
	__inet_hash_nolisten(newsk, NULL);

	return newsk;

exit_overflow:
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
exit_nonewsk:
	dst_release(dst);
exit:
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
	return NULL;
put_and_exit:
	bh_unlock_sock(newsk);
	sock_put(newsk);
	goto exit;
}