• Peter Oskolkov's avatar
    net/ipv6: do not copy dst flags on rt init · 30bfd930
    Peter Oskolkov authored
    DST_NOCOUNT in dst_entry::flags tracks whether the entry counts
    toward route cache size (net->ipv6.sysctl.ip6_rt_max_size).
    
    If the flag is NOT set, dst_ops::pcpuc_entries counter is incremented
    in dist_init() and decremented in dst_destroy().
    
    This flag is tied to allocation/deallocation of dst_entry and
    should not be copied from another dst/route. Otherwise it can happen
    that dst_ops::pcpuc_entries counter grows until no new routes can
    be allocated because the counter reached ip6_rt_max_size due to
    DST_NOCOUNT not set and thus no counter decrements on gc-ed routes.
    
    Fixes: 3b6761d1 ("net/ipv6: Move dst flags to booleans in fib entries")
    Cc: David Ahern <dsahern@gmail.com>
    Acked-by: default avatarWei Wang <weiwan@google.com>
    Signed-off-by: default avatarPeter Oskolkov <posk@google.com>
    Reviewed-by: default avatarDavid Ahern <dsahern@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    30bfd930
route.c 133 KB