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netfilter: nft_tproxy: restrict support to TCP and UDP transport protocols 

[ Upstream commit 52f0f4e178c757b3d356087376aad8bd77271828 ]

Add unfront check for TCP and UDP packets before performing further
processing.

Fixes: 4ed8eb6570 ("netfilter: nf_tables: Add native tproxy support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pablo Neira Ayuso 2021-06-11 19:26:56 +02:00 committed by Greg Kroah-Hartman
parent a3f1e8e316
commit da4ad14f87
1 changed files with 8 additions and 1 deletions
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9
net/netfilter/nft_tproxy.c
View File

@ -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;
}