[PATCH 5.13 476/800] netfilter: nft_tproxy: restrict support to TCP and UDP transport protocols
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-07-12 08:42:04
Also in:
lkml
Subsystem:
netfilter, networking [general], the rest · Maintainers:
Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Pablo Neira Ayuso <pablo@netfilter.org>
[ Upstream commit 52f0f4e178c757b3d356087376aad8bd77271828 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/netfilter/nft_tproxy.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
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; }
--
2.30.2