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

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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: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
2017-08-28 13:53:34 -07:00
committed by David S. Miller
parent f602b976b6
commit 1b70d792cf
2 changed files with 30 additions and 13 deletions
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33
net/ipv6/icmp.c
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@@ -399,6 +399,24 @@ relookup_failed:
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);