• Timo Teräs's avatar
    ipv4: check rt_genid in dst_check · d11a4dc1
    Timo Teräs authored
    Xfrm_dst keeps a reference to ipv4 rtable entries on each
    cached bundle. The only way to renew xfrm_dst when the underlying
    route has changed, is to implement dst_check for this. This is
    what ipv6 side does too.
    
    The problems started after 87c1e12b
    ("ipsec: Fix bogus bundle flowi") which fixed a bug causing xfrm_dst
    to not get reused, until that all lookups always generated new
    xfrm_dst with new route reference and path mtu worked. But after the
    fix, the old routes started to get reused even after they were expired
    causing pmtu to break (well it would occationally work if the rtable
    gc had run recently and marked the route obsolete causing dst_check to
    get called).
    Signed-off-by: default avatarTimo Teras <timo.teras@iki.fi>
    Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    d11a4dc1
route.c 84.1 KB