| Message ID | DFD1E072-5112-4FFD-9BD7-525A2CE2D34B@telecom-bretagne.eu |
|---|---|
| State | RFC, archived |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index f54e3a1..65ce3d9 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -595,7 +595,8 @@ static int rt6_score_route(struct rt6_info *rt, int oif, int m; m = rt6_check_dev(rt, oif); - if (!m && (strict & RT6_LOOKUP_F_IFACE)) + if (!m && + ((strict & RT6_LOOKUP_F_IFACE) || (rt->rt6i_flags & RTF_CACHE))) return RT6_NUD_FAIL_HARD; #ifdef CONFIG_IPV6_ROUTER_PREF m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
On route selection, make the cache to be used only when the flow output interface corresponds to the next hop interface. This fixes problems for IPv6 hosts in multi-interfaces setup. When a packet is sent through an interface, the RTF_CACHE entry is created based on a specific flow information (e.g. with fl6->flowi6_oif set to a specific value). If another packet is sent with a different flow information than the first one, the RTF_CACHE entry is used regardless of flow information, even if this information would make the route selection algorithm to select a different route. By ignoring RTF_CACHE entries for which rt6_check_dev() fails, we ensure consistency of the route selection algorithm. Signed-off-by: Emmanuel Thierry <emmanuel.thierry@telecom-bretagne.eu> --- net/ipv6/route.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)