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Commit 1b70d792 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

ipv6: Use rt6i_idev index for echo replies to a local address 



Tariq repored local pings to linklocal address is failing:
$ ifconfig ens8
ens8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 11.141.16.6  netmask 255.255.0.0  broadcast 11.141.255.255
        inet6 fe80::7efe:90ff:fecb:7502  prefixlen 64  scopeid 0x20<link>
        ether 7c:fe:90:cb:75:02  txqueuelen 1000  (Ethernet)
        RX packets 12  bytes 1164 (1.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 30  bytes 2484 (2.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

$  /bin/ping6 -c 3 fe80::7efe:90ff:fecb:7502%ens8
PING fe80::7efe:90ff:fecb:7502%ens8(fe80::7efe:90ff:fecb:7502) 56 data bytes

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f602b976

include/net/ip6_route.h

+10 −0
Original line number Diff line number Diff line
@@ -164,6 +164,16 @@ void rt6_mtu_change(struct net_device *dev, unsigned int mtu); 
void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);

void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);



static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)

{

	const struct dst_entry *dst = skb_dst(skb);

	const struct rt6_info *rt6 = NULL;



	if (dst)

		rt6 = container_of(dst, struct rt6_info, dst);



	return rt6;

}



/*

 *	Store a destination cache entry in a socket

net/ipv6/icmp.c

+20 −13
Original line number Diff line number Diff line
@@ -399,6 +399,24 @@ static struct dst_entry *icmpv6_route_lookup(struct net *net, 
	return ERR_PTR(err);

}



static int icmp6_iif(const struct sk_buff *skb)

{

	int iif = skb->dev->ifindex;



	/* for local traffic to local address, skb dev is the loopback

	 * device. Check if there is a dst attached to the skb and if so

	 * get the real device index.

	 */

	if (unlikely(iif == LOOPBACK_IFINDEX)) {

		const struct rt6_info *rt6 = skb_rt6_info(skb);



		if (rt6)

			iif = rt6->rt6i_idev->dev->ifindex;

	}



	return iif;

}



/*

 *	Send an ICMP message in response to a packet in error

 */
@@ -460,18 +478,7 @@ static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info, 
	 */



	if (__ipv6_addr_needs_scope_id(addr_type)) {

		iif = skb->dev->ifindex;



		/* for local packets, get the real device index */

		if (iif == LOOPBACK_IFINDEX) {

			dst = skb_dst(skb);

			if (dst) {

				struct rt6_info *rt;



				rt = container_of(dst, struct rt6_info, dst);

				iif = rt->rt6i_idev->dev->ifindex;

			}

		}

		iif = icmp6_iif(skb);

	} else {

		dst = skb_dst(skb);

		iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev);
@@ -694,7 +701,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb) 
	fl6.daddr = ipv6_hdr(skb)->saddr;

	if (saddr)

		fl6.saddr = *saddr;

	fl6.flowi6_oif = skb->dev->ifindex;

	fl6.flowi6_oif = icmp6_iif(skb);

	fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY;

	fl6.flowi6_mark = mark;

	fl6.flowi6_uid = sock_net_uid(net, NULL);