diff mbox series

[net,4/8] netfilter: nft_tproxy: restrict support to TCP and UDP transport protocols

Message ID 20210622220001.198508-5-pablo@netfilter.org
State New
Headers show
Series Netfilter fixes for net | expand

Commit Message

Pablo Neira Ayuso June 22, 2021, 9:59 p.m. UTC 
Add unfront check for TCP and UDP packets before performing further
processing.

Fixes: 4ed8eb6570a4 ("netfilter: nf_tables: Add native tproxy support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nft_tproxy.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/net/netfilter/nft_tproxy.c b/net/netfilter/nft_tproxy.c
index accef672088c..5cb4d575d47f 100644
--- a/net/netfilter/nft_tproxy.c
+++ b/net/netfilter/nft_tproxy.c
@@ -30,6 +30,12 @@  static void nft_tproxy_eval_v4(const struct nft_expr *expr,
 	__be16 tport = 0;
 	struct sock *sk;
 
+	if (pkt->tprot != IPPROTO_TCP &&
+	    pkt->tprot != IPPROTO_UDP) {
+		regs->verdict.code = NFT_BREAK;
+		return;
+	}
+
 	hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr);
 	if (!hp) {
 		regs->verdict.code = NFT_BREAK;
@@ -91,7 +97,8 @@  static void nft_tproxy_eval_v6(const struct nft_expr *expr,
 
 	memset(&taddr, 0, sizeof(taddr));
 
-	if (!pkt->tprot_set) {
+	if (pkt->tprot != IPPROTO_TCP &&
+	    pkt->tprot != IPPROTO_UDP) {
 		regs->verdict.code = NFT_BREAK;
 		return;
 	}