4.4-stable review patch. If anyone has any objections, please let me know.
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From: Pau Espin Pedrol pau.espin@tessares.net
commit cc31d43b4154ad5a7d8aa5543255a93b7e89edc2 upstream.
Otherwise, RST packets generated by ipt_REJECT always have mark 0 when the routing is checked later in the same code path.
Fixes: e110861f8609 ("net: add a sysctl to reflect the fwmark on replies") Cc: Lorenzo Colitti lorenzo@google.com Signed-off-by: Pau Espin Pedrol pau.espin@tessares.net Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Acked-by: Michal Kubecek mkubecek@suse.cz Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/ipv4/netfilter/nf_reject_ipv4.c | 2 ++ net/ipv6/netfilter/nf_reject_ipv6.c | 3 +++ 2 files changed, 5 insertions(+)
--- a/net/ipv4/netfilter/nf_reject_ipv4.c +++ b/net/ipv4/netfilter/nf_reject_ipv4.c @@ -124,6 +124,8 @@ void nf_send_reset(struct net *net, stru /* ip_route_me_harder expects skb->dst to be set */ skb_dst_set_noref(nskb, skb_dst(oldskb));
+ nskb->mark = IP4_REPLY_MARK(net, oldskb->mark); + skb_reserve(nskb, LL_MAX_HEADER); niph = nf_reject_iphdr_put(nskb, oldskb, IPPROTO_TCP, ip4_dst_hoplimit(skb_dst(nskb))); --- a/net/ipv6/netfilter/nf_reject_ipv6.c +++ b/net/ipv6/netfilter/nf_reject_ipv6.c @@ -157,6 +157,7 @@ void nf_send_reset6(struct net *net, str fl6.daddr = oip6h->saddr; fl6.fl6_sport = otcph->dest; fl6.fl6_dport = otcph->source; + fl6.flowi6_mark = IP6_REPLY_MARK(net, oldskb->mark); security_skb_classify_flow(oldskb, flowi6_to_flowi(&fl6)); dst = ip6_route_output(net, NULL, &fl6); if (dst == NULL || dst->error) { @@ -180,6 +181,8 @@ void nf_send_reset6(struct net *net, str
skb_dst_set(nskb, dst);
+ nskb->mark = fl6.flowi6_mark; + skb_reserve(nskb, hh_len + dst->header_len); ip6h = nf_reject_ip6hdr_put(nskb, oldskb, IPPROTO_TCP, ip6_dst_hoplimit(dst));