From 21cbab5b6ffec409d5677802bcd1172d0d1cd990 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Sun, 13 Oct 2019 00:17:52 +0200 Subject: expression: extend 'nft describe' to allow listing data types nft describe ct_status before: symbol expression, datatype invalid (invalid), 0 bits after: datatype ct_status (conntrack status) (basetype bitmask, integer), 32 bits pre-defined symbolic constants (in hexadecimal): expected 0x00000001 seen-reply 0x00000002 [..] Signed-off-by: Florian Westphal Acked-by: Pablo Neira Ayuso --- doc/nft.txt | 15 ++++++++++++++- doc/primary-expression.txt | 2 ++ 2 files changed, 16 insertions(+), 1 deletion(-) (limited to 'doc') diff --git a/doc/nft.txt b/doc/nft.txt index 8a49c2fe..9bc5986b 100644 --- a/doc/nft.txt +++ b/doc/nft.txt @@ -642,9 +642,11 @@ representation of symbolic values and type compatibility with other expressions. DESCRIBE COMMAND ~~~~~~~~~~~~~~~~ [verse] -*describe* 'expression' +*describe* 'expression' | 'data type' The *describe* command shows information about the type of an expression and its data type. +A data type may also be given, in which nft will display more information +about the type. .The describe command --------------------- @@ -670,6 +672,17 @@ and type compatibility of expressions. A number of global data types exist, in addition some expression types define further data types specific to the expression type. Most data types have a fixed size, some however may have a dynamic size, f.i. the string type. + +Some types also have predefined symbolic constants. Those can be listed +using the nft *describe* command: + +--------------------- +$ nft describe ct_state +datatype ct_state (conntrack state) (basetype bitmask, integer), 32 bits + +pre-defined symbolic constants (in hexadecimal): +invalid 0x00000001 +new ... +--------------------- Types may be derived from lower order types, f.i. the IPv4 address type is derived from the integer type, meaning an IPv4 address can also be specified as diff --git a/doc/primary-expression.txt b/doc/primary-expression.txt index c5d25eee..0316a7e1 100644 --- a/doc/primary-expression.txt +++ b/doc/primary-expression.txt @@ -292,6 +292,8 @@ Address type | fib_addrtype |======================= +Use *nft* *describe* *fib_addrtype* to get a list of all address types. + .Using fib expressions ---------------------- # drop packets without a reverse path -- cgit v1.2.3