From: Julian Anastasov Date: Sat, 27 Jun 2015 11:39:30 +0000 (+0300) Subject: ipvs: do not use random local source address for tunnels X-Git-Tag: v4.2-rc5~9^2~36^2~1^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4754957f04f5f368792a0eb7dab0ae89fb93dcfd;p=profile%2Fcommon%2Fplatform%2Fkernel%2Flinux-artik7.git ipvs: do not use random local source address for tunnels Michael Vallaly reports about wrong source address used in rare cases for tunneled traffic. Looks like __ip_vs_get_out_rt in 3.10+ is providing uninitialized dest_dst->dst_saddr.ip because ip_vs_dest_dst_alloc uses kmalloc. While we retry after seeing EINVAL from routing for data that does not look like valid local address, it still succeeded when this memory was previously used from other dests and with different local addresses. As result, we can use valid local address that is not suitable for our real server. Fix it by providing 0.0.0.0 every time our cache is refreshed. By this way we will get preferred source address from routing. Reported-by: Michael Vallaly Fixes: 026ace060dfe ("ipvs: optimize dst usage for real server") Signed-off-by: Julian Anastasov Signed-off-by: Simon Horman --- diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c index b99d806..ec30d68 100644 --- a/net/netfilter/ipvs/ip_vs_xmit.c +++ b/net/netfilter/ipvs/ip_vs_xmit.c @@ -130,7 +130,6 @@ static struct rtable *do_output_route4(struct net *net, __be32 daddr, memset(&fl4, 0, sizeof(fl4)); fl4.daddr = daddr; - fl4.saddr = (rt_mode & IP_VS_RT_MODE_CONNECT) ? *saddr : 0; fl4.flowi4_flags = (rt_mode & IP_VS_RT_MODE_KNOWN_NH) ? FLOWI_FLAG_KNOWN_NH : 0;