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

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
...@@ -164,6 +164,16 @@ void rt6_mtu_change(struct net_device *dev, unsigned int mtu); ...@@ -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_remove_prefsrc(struct inet6_ifaddr *ifp);
void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); 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 * Store a destination cache entry in a socket
......
...@@ -399,6 +399,24 @@ static struct dst_entry *icmpv6_route_lookup(struct net *net, ...@@ -399,6 +399,24 @@ static struct dst_entry *icmpv6_route_lookup(struct net *net,
return ERR_PTR(err); 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 * 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, ...@@ -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)) { if (__ipv6_addr_needs_scope_id(addr_type)) {
iif = skb->dev->ifindex; iif = icmp6_iif(skb);
/* 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;
}
}
} else { } else {
dst = skb_dst(skb); dst = skb_dst(skb);
iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev); iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev);
...@@ -694,7 +701,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb) ...@@ -694,7 +701,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
fl6.daddr = ipv6_hdr(skb)->saddr; fl6.daddr = ipv6_hdr(skb)->saddr;
if (saddr) if (saddr)
fl6.saddr = *saddr; fl6.saddr = *saddr;
fl6.flowi6_oif = skb->dev->ifindex; fl6.flowi6_oif = icmp6_iif(skb);
fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY;
fl6.flowi6_mark = mark; fl6.flowi6_mark = mark;
fl6.flowi6_uid = sock_net_uid(net, NULL); fl6.flowi6_uid = sock_net_uid(net, NULL);
......
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