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authorFlorian Westphal <fw@strlen.de>2016-09-15 17:28:00 +0200
committerFlorian Westphal <fw@strlen.de>2016-10-28 13:17:44 +0200
commit4a75ed32132d8e2292dd276f3ea7f4edec4f3d06 (patch)
tree1c095dc262a953ebb816d1770ccbdef1724e3e00 /include/linux/netfilter/nf_tables.h
parentdfd92948a0a88a9f245e71c1cfb63ae670e6e7c1 (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/netfilter/nf_tables.h')
-rw-r--r--include/linux/netfilter/nf_tables.h36
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
*