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netfilter: nft_payload: add packet mangling support

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Add support for mangling packet payload. Checksum for the specified base
header is updated automatically if requested, however no updates for any
kind of pseudo headers are supported, meaning no stateless NAT is supported.

For checksum updates different checksumming methods can be specified. The
currently supported methods are NONE for no checksum updates, and INET for
internet type checksums.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy
2015-11-24 10:00:22 +00:00
committed by Pablo Neira Ayuso
parent a9ecfbe7fc
commit 7ec3f7b47b
3 changed files with 155 additions and 6 deletions
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17
include/uapi/linux/netfilter/nf_tables.h
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@@ -597,6 +597,17 @@ enum nft_payload_bases {
NFT_PAYLOAD_TRANSPORT_HEADER,
};
/**
* enum nft_payload_csum_types - nf_tables payload expression checksum types
*
* @NFT_PAYLOAD_CSUM_NONE: no checksumming
* @NFT_PAYLOAD_CSUM_INET: internet checksum (RFC 791)
*/
enum nft_payload_csum_types {
NFT_PAYLOAD_CSUM_NONE,
NFT_PAYLOAD_CSUM_INET,
};
/**
* enum nft_payload_attributes - nf_tables payload expression netlink attributes
*
@@ -604,6 +615,9 @@ enum nft_payload_bases {
* @NFTA_PAYLOAD_BASE: payload base (NLA_U32: nft_payload_bases)
* @NFTA_PAYLOAD_OFFSET: payload offset relative to base (NLA_U32)
* @NFTA_PAYLOAD_LEN: payload length (NLA_U32)
* @NFTA_PAYLOAD_SREG: source register to load data from (NLA_U32: nft_registers)
* @NFTA_PAYLOAD_CSUM_TYPE: checksum type (NLA_U32)
* @NFTA_PAYLOAD_CSUM_OFFSET: checksum offset relative to base (NLA_U32)
*/
enum nft_payload_attributes {
NFTA_PAYLOAD_UNSPEC,
@@ -611,6 +625,9 @@ enum nft_payload_attributes {
NFTA_PAYLOAD_BASE,
NFTA_PAYLOAD_OFFSET,
NFTA_PAYLOAD_LEN,
NFTA_PAYLOAD_SREG,
NFTA_PAYLOAD_CSUM_TYPE,
NFTA_PAYLOAD_CSUM_OFFSET,
__NFTA_PAYLOAD_MAX
};
#define NFTA_PAYLOAD_MAX (__NFTA_PAYLOAD_MAX - 1)