diff options
author | Florian Westphal <fw@strlen.de> | 2016-09-15 17:28:00 +0200 |
---|---|---|
committer | Florian Westphal <fw@strlen.de> | 2016-10-28 13:17:44 +0200 |
commit | 4a75ed32132d8e2292dd276f3ea7f4edec4f3d06 (patch) | |
tree | 1c095dc262a953ebb816d1770ccbdef1724e3e00 /include/linux | |
parent | dfd92948a0a88a9f245e71c1cfb63ae670e6e7c1 (diff) |
src: add fib expression
This adds the 'fib' expression which can be used to
obtain the output interface from the route table based on either
source or destination address of a packet.
This can be used to e.g. add reverse path filtering:
# drop if not coming from the same interface packet
# arrived on
# nft add rule x prerouting fib saddr . iif oif eq 0 drop
# accept only if from eth0
# nft add rule x prerouting fib saddr . iif oif eq "eth0" accept
# accept if from any valid interface
# nft add rule x prerouting fib saddr oif accept
Querying of address type is also supported. This can be used
to e.g. only accept packets to addresses configured in the same
interface:
# fib daddr . iif type local
Its also possible to use mark and verdict map, e.g.:
# nft add rule x prerouting meta mark set 0xdead fib daddr . mark type vmap {
blackhole : drop,
prohibit : drop,
unicast : accept
}
Signed-off-by: Florian Westphal <fw@strlen.de>
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/netfilter/nf_tables.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/include/linux/netfilter/nf_tables.h b/include/linux/netfilter/nf_tables.h index 2d477847..c6567ace 100644 --- a/include/linux/netfilter/nf_tables.h +++ b/include/linux/netfilter/nf_tables.h @@ -1126,6 +1126,42 @@ enum nft_gen_attributes { }; #define NFTA_GEN_MAX (__NFTA_GEN_MAX - 1) +/* + * enum nft_fib_attributes - nf_tables fib expression netlink attributes + * + * @NFTA_FIB_DREG: destination register (NLA_U32) + * @NFTA_FIB_RESULT: desired result (NLA_U32) + * @NFTA_FIB_FLAGS: flowi fields to initialize when querying the FIB (NLA_U32) + * + * The FIB expression performs a route lookup according + * to the packet data. + */ +enum nft_fib_attributes { + NFTA_FIB_UNSPEC, + NFTA_FIB_DREG, + NFTA_FIB_RESULT, + NFTA_FIB_FLAGS, + __NFTA_FIB_MAX +}; +#define NFTA_FIB_MAX (__NFTA_FIB_MAX - 1) + +enum nft_fib_result { + NFT_FIB_RESULT_UNSPEC, + NFT_FIB_RESULT_OIF, + NFT_FIB_RESULT_OIFNAME, + NFT_FIB_RESULT_ADDRTYPE, + __NFT_FIB_RESULT_MAX +}; +#define NFT_FIB_RESULT_MAX (__NFT_FIB_RESULT_MAX - 1) + +enum nft_fib_flags { + NFTA_FIB_F_SADDR = 1 << 0, /* look up src */ + NFTA_FIB_F_DADDR = 1 << 1, /* look up dst */ + NFTA_FIB_F_MARK = 1 << 2, /* use skb->mark */ + NFTA_FIB_F_IIF = 1 << 3, /* restrict to iif */ + NFTA_FIB_F_OIF = 1 << 4, /* restrict to oif */ +}; + /** * enum nft_trace_attributes - nf_tables trace netlink attributes * |