Commit 6f86b325 authored by David S. Miller's avatar David S. Miller
Browse files

ipv4: Fix reverse path filtering with multipath routing.

Actually iterate over the next-hops to make sure we have
a device match.  Otherwise RP filtering is always elided
when the route matched has multiple next-hops.

Reported-by: default avatarIgor M Podlesny <>
Signed-off-by: default avatarDavid S. Miller <>
parent 8df73ff9
......@@ -246,6 +246,7 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
struct fib_result res;
int no_addr, rpf, accept_local;
bool dev_match;
int ret;
struct net *net;
......@@ -273,12 +274,22 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
*spec_dst = FIB_RES_PREFSRC(res);
fib_combine_itag(itag, &res);
dev_match = false;
if (FIB_RES_DEV(res) == dev ||>fib_nhs > 1)
for (ret = 0; ret <>fib_nhs; ret++) {
struct fib_nh *nh = &>fib_nh[ret];
if (nh->nh_dev == dev) {
dev_match = true;
if (FIB_RES_DEV(res) == dev)
dev_match = true;
if (dev_match) {
ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
return ret;
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