Commit 3c1fece8 authored by Phil Sutter's avatar Phil Sutter Committed by Pablo Neira Ayuso
Browse files

netfilter: nft_exthdr: Allow checking TCP option presence, too 



Honor NFT_EXTHDR_F_PRESENT flag so we check if the TCP option is
present.

Signed-off-by: default avatarPhil Sutter <phil@nwl.cc>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 8d70eeb8

net/netfilter/nft_exthdr.c

+10 −3
Original line number Diff line number Diff line
@@ -98,13 +98,20 @@ static void nft_exthdr_tcp_eval(const struct nft_expr *expr, 
			goto err;



		offset = i + priv->offset;

		if (priv->flags & NFT_EXTHDR_F_PRESENT) {

			*dest = 1;

		} else {

			dest[priv->len / NFT_REG32_SIZE] = 0;

			memcpy(dest, opt + offset, priv->len);

		}



		return;

	}



err:

	if (priv->flags & NFT_EXTHDR_F_PRESENT)

		*dest = 0;

	else

		regs->verdict.code = NFT_BREAK;

}