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authorLiping Zhang <zlpnobody@gmail.com>2016-12-03 21:25:08 +0800
committerPablo Neira Ayuso <pablo@netfilter.org>2016-12-07 13:22:50 +0100
commit3b760dcb0fd304873dfde9ff072a49f893c6f5c4 (patch)
treecd9f09deb15027114015982e25c3a0a52c3d70f2 /net/ipv4
parenta9fea2a3c3cf7a09b7f4302489f535477ead67d2 (diff)
netfilter: rpfilter: bypass ipv4 lbcast packets with zeronet source
Otherwise, DHCP Discover packets(0.0.0.0->255.255.255.255) may be dropped incorrectly. Signed-off-by: Liping Zhang <zlpnobody@gmail.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/ipt_rpfilter.c8
-rw-r--r--net/ipv4/netfilter/nft_fib_ipv4.c13
2 files changed, 12 insertions, 9 deletions
diff --git a/net/ipv4/netfilter/ipt_rpfilter.c b/net/ipv4/netfilter/ipt_rpfilter.c
index 59b49945b481..f273098e48fd 100644
--- a/net/ipv4/netfilter/ipt_rpfilter.c
+++ b/net/ipv4/netfilter/ipt_rpfilter.c
@@ -83,10 +83,12 @@ static bool rpfilter_mt(const struct sk_buff *skb, struct xt_action_param *par)
return true ^ invert;
iph = ip_hdr(skb);
- if (ipv4_is_multicast(iph->daddr)) {
- if (ipv4_is_zeronet(iph->saddr))
- return ipv4_is_local_multicast(iph->daddr) ^ invert;
+ if (ipv4_is_zeronet(iph->saddr)) {
+ if (ipv4_is_lbcast(iph->daddr) ||
+ ipv4_is_local_multicast(iph->daddr))
+ return true ^ invert;
}
+
flow.flowi4_iif = LOOPBACK_IFINDEX;
flow.daddr = iph->saddr;
flow.saddr = rpfilter_get_saddr(iph->daddr);
diff --git a/net/ipv4/netfilter/nft_fib_ipv4.c b/net/ipv4/netfilter/nft_fib_ipv4.c
index 258136364f5e..965b1a161369 100644
--- a/net/ipv4/netfilter/nft_fib_ipv4.c
+++ b/net/ipv4/netfilter/nft_fib_ipv4.c
@@ -101,12 +101,13 @@ void nft_fib4_eval(const struct nft_expr *expr, struct nft_regs *regs,
}
iph = ip_hdr(pkt->skb);
- if (ipv4_is_multicast(iph->daddr) &&
- ipv4_is_zeronet(iph->saddr) &&
- ipv4_is_local_multicast(iph->daddr)) {
- nft_fib_store_result(dest, priv->result, pkt,
- get_ifindex(pkt->skb->dev));
- return;
+ if (ipv4_is_zeronet(iph->saddr)) {
+ if (ipv4_is_lbcast(iph->daddr) ||
+ ipv4_is_local_multicast(iph->daddr)) {
+ nft_fib_store_result(dest, priv->result, pkt,
+ get_ifindex(pkt->skb->dev));
+ return;
+ }
}
if (priv->flags & NFTA_FIB_F_MARK)