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Diffstat (limited to 'doc/nft.txt')
| -rw-r--r-- | doc/nft.txt | 15 |
1 files changed, 14 insertions, 1 deletions
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 |