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* expr: hash: support of symmetric hashLaura Garcia Liebana2017-03-061-0/+4
| | | | | | | | | | | | | | | | | | | | | This patch provides symmetric hash support according to source ip address and port, and destination ip address and port. The new attribute NFTA_HASH_TYPE has been included to support different types of hashing functions. Currently supported NFT_HASH_JENKINS through jhash and NFT_HASH_SYM through symhash. The main difference between both types are: - jhash requires an expression with sreg, symhash doesn't. - symhash supports modulus and offset, but not seed. Examples: nft add rule ip nat prerouting ct mark set jhash ip saddr mod 2 nft add rule ip nat prerouting ct mark set symhash mod 2 Signed-off-by: Laura Garcia Liebana <laura.garcia@zevenet.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* expr: hash: Add offset to hash valueLaura Garcia Liebana2016-09-121-0/+4
| | | | | | | | | | | | | | | | Add support to pass through an offset to the hash value. With this feature, the sysadmin is able to generate a hash with a given started value. Example: meta mark set jhash ip saddr mod 2 seed 0xabcd offset 100 This option generates marks according to the source address from 100 to 101. Signed-off-by: Laura Garcia Liebana <nevola@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* expr: add hash expressionLaura Garcia Liebana2016-08-171-0/+102
Support for the nft hash expression in libnftnl. Signed-off-by: Laura Garcia Liebana <nevola@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>