From edf0e1fb0d0910880881523cfaaabcec06a2c0d5 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Thu, 15 Jul 2010 17:20:46 +0200 Subject: netfilter: add CHECKSUM target This adds a `CHECKSUM' target, which can be used in the iptables mangle table. You can use this target to compute and fill in the checksum in a packet that lacks a checksum. This is particularly useful, if you need to work around old applications such as dhcp clients, that do not work well with checksum offloads, but don't want to disable checksum offload in your device. The problem happens in the field with virtualized applications. For reference, see Red Hat bz 605555, as well as http://www.spinics.net/lists/kvm/msg37660.html Typical expected use (helps old dhclient binary running in a VM): iptables -A POSTROUTING -t mangle -p udp --dport bootpc \ -j CHECKSUM --checksum-fill Includes fixes by Jan Engelhardt Signed-off-by: Michael S. Tsirkin Signed-off-by: Patrick McHardy --- include/linux/netfilter/xt_CHECKSUM.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 include/linux/netfilter/xt_CHECKSUM.h (limited to 'include') diff --git a/include/linux/netfilter/xt_CHECKSUM.h b/include/linux/netfilter/xt_CHECKSUM.h new file mode 100644 index 00000000000..3b4fb77acef --- /dev/null +++ b/include/linux/netfilter/xt_CHECKSUM.h @@ -0,0 +1,18 @@ +/* Header file for iptables ipt_CHECKSUM target + * + * (C) 2002 by Harald Welte + * (C) 2010 Red Hat Inc + * Author: Michael S. Tsirkin + * + * This software is distributed under GNU GPL v2, 1991 +*/ +#ifndef _IPT_CHECKSUM_TARGET_H +#define _IPT_CHECKSUM_TARGET_H + +#define XT_CHECKSUM_OP_FILL 0x01 /* fill in checksum in IP header */ + +struct xt_CHECKSUM_info { + __u8 operation; /* bitset of operations */ +}; + +#endif /* _IPT_CHECKSUM_TARGET_H */ -- cgit v1.2.3-18-g5258