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netfilter: nft_reject: introduce icmp code abstraction for inet and bridge

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This patch introduces the NFT_REJECT_ICMPX_UNREACH type which provides
an abstraction to the ICMP and ICMPv6 codes that you can use from the
inet and bridge tables, they are:

* NFT_REJECT_ICMPX_NO_ROUTE: no route to host - network unreachable
* NFT_REJECT_ICMPX_PORT_UNREACH: port unreachable
* NFT_REJECT_ICMPX_HOST_UNREACH: host unreachable
* NFT_REJECT_ICMPX_ADMIN_PROHIBITED: administratevely prohibited

You can still use the specific codes when restricting the rule to match
the corresponding layer 3 protocol.

I decided to not overload the existing NFT_REJECT_ICMP_UNREACH to have
different semantics depending on the table family and to allow the user
to specify ICMP family specific codes if they restrict it to the
corresponding family.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2014-09-26 14:35:14 +02:00
parent 2c804d0f8f
commit 51b0a5d8c2
7 changed files with 241 additions and 17 deletions
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21
include/uapi/linux/netfilter/nf_tables.h
View file

@ -749,12 +749,33 @@ enum nft_queue_attributes {
*
* @NFT_REJECT_ICMP_UNREACH: reject using ICMP unreachable
* @NFT_REJECT_TCP_RST: reject using TCP RST
* @NFT_REJECT_ICMPX_UNREACH: abstracted ICMP unreachable for bridge and inet
*/
enum nft_reject_types {
NFT_REJECT_ICMP_UNREACH,
NFT_REJECT_TCP_RST,
NFT_REJECT_ICMPX_UNREACH,
};
/**
* enum nft_reject_code - Generic reject codes for IPv4/IPv6
*
* @NFT_REJECT_ICMPX_NO_ROUTE: no route to host / network unreachable
* @NFT_REJECT_ICMPX_PORT_UNREACH: port unreachable
* @NFT_REJECT_ICMPX_HOST_UNREACH: host unreachable
* @NFT_REJECT_ICMPX_ADMIN_PROHIBITED: administratively prohibited
*
* These codes are mapped to real ICMP and ICMPv6 codes.
*/
enum nft_reject_inet_code {
NFT_REJECT_ICMPX_NO_ROUTE = 0,
NFT_REJECT_ICMPX_PORT_UNREACH,
NFT_REJECT_ICMPX_HOST_UNREACH,
NFT_REJECT_ICMPX_ADMIN_PROHIBITED,
__NFT_REJECT_ICMPX_MAX
};
#define NFT_REJECT_ICMPX_MAX (__NFT_REJECT_ICMPX_MAX + 1)
/**
* enum nft_reject_attributes - nf_tables reject expression netlink attributes
*