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; }