Commit 0dec879f authored by Julian Anastasov's avatar Julian Anastasov Committed by David S. Miller
Browse files

net: use dst_confirm_neigh for UDP, RAW, ICMP, L2TP 



When same struct dst_entry can be used for many different
neighbours we can not use it for pending confirmations.

The datagram protocols can use MSG_CONFIRM to confirm the
neighbour. When used with MSG_PROBE we do not reach the
code where neighbour is confirmed, so we have to do the
same slow lookup by using the dst_confirm_neigh() helper.
When MSG_PROBE is not used, ip_append_data/ip6_append_data
will set the skb flag dst_pending_confirm.

Reported-by: default avatarYueHaibing <yuehaibing@huawei.com>
Fixes: 5110effe ("net: Do delayed neigh confirmation.")
Fixes: f2bb4bed ("ipv4: Cache output routes in fib_info nexthops.")
Signed-off-by: default avatarJulian Anastasov <ja@ssi.bg>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 63fca65d

net/ipv4/ip_output.c

+6 −0
Original line number Diff line number Diff line
@@ -889,6 +889,9 @@ static inline int ip_ufo_append_data(struct sock *sk, 


		skb->csum = 0;



		if (flags & MSG_CONFIRM)

			skb_set_dst_pending_confirm(skb, 1);



		__skb_queue_tail(queue, skb);

	} else if (skb_is_gso(skb)) {

		goto append;
@@ -1089,6 +1092,9 @@ alloc_new_skb: 
			exthdrlen = 0;

			csummode = CHECKSUM_NONE;



			if ((flags & MSG_CONFIRM) && !skb_prev)

				skb_set_dst_pending_confirm(skb, 1);



			/*

			 * Put the packet on the pending queue.

			 */

net/ipv4/ping.c

+2 −1
Original line number Diff line number Diff line
@@ -848,7 +848,8 @@ out: 
	return err;



do_confirm:

	dst_confirm(&rt->dst);

	if (msg->msg_flags & MSG_PROBE)

		dst_confirm_neigh(&rt->dst, &fl4.daddr);

	if (!(msg->msg_flags & MSG_PROBE) || len)

		goto back_from_confirm;

	err = 0;

net/ipv4/raw.c

+5 −1
Original line number Diff line number Diff line
@@ -383,6 +383,9 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, 


	sock_tx_timestamp(sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);



	if (flags & MSG_CONFIRM)

		skb_set_dst_pending_confirm(skb, 1);



	skb->transport_header = skb->network_header;

	err = -EFAULT;

	if (memcpy_from_msg(iph, msg, length))
@@ -666,7 +669,8 @@ out: 
	return len;



do_confirm:

	dst_confirm(&rt->dst);

	if (msg->msg_flags & MSG_PROBE)

		dst_confirm_neigh(&rt->dst, &fl4.daddr);

	if (!(msg->msg_flags & MSG_PROBE) || len)

		goto back_from_confirm;

	err = 0;

net/ipv4/udp.c

+2 −1
Original line number Diff line number Diff line
@@ -1101,7 +1101,8 @@ out: 
	return err;



do_confirm:

	dst_confirm(&rt->dst);

	if (msg->msg_flags & MSG_PROBE)

		dst_confirm_neigh(&rt->dst, &fl4->daddr);

	if (!(msg->msg_flags&MSG_PROBE) || len)

		goto back_from_confirm;

	err = 0;

net/ipv6/ip6_output.c

+6 −0
Original line number Diff line number Diff line
@@ -1145,6 +1145,9 @@ static inline int ip6_ufo_append_data(struct sock *sk, 
		skb->protocol = htons(ETH_P_IPV6);

		skb->csum = 0;



		if (flags & MSG_CONFIRM)

			skb_set_dst_pending_confirm(skb, 1);



		__skb_queue_tail(queue, skb);

	} else if (skb_is_gso(skb)) {

		goto append;
@@ -1517,6 +1520,9 @@ alloc_new_skb: 
			exthdrlen = 0;

			dst_exthdrlen = 0;



			if ((flags & MSG_CONFIRM) && !skb_prev)

				skb_set_dst_pending_confirm(skb, 1);



			/*

			 * Put the packet on the pending queue

			 */

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