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Diffstat (limited to 'doc/primary-expression.txt')
| -rw-r--r-- | doc/primary-expression.txt | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/doc/primary-expression.txt b/doc/primary-expression.txt index f97778b9..782494bd 100644 --- a/doc/primary-expression.txt +++ b/doc/primary-expression.txt @@ -168,15 +168,18 @@ Either an integer or a date in ISO format. For example: "2019-06-06 17:00". Hour and seconds are optional and can be omitted if desired. If omitted, midnight will be assumed. The following three would be equivalent: "2019-06-06", "2019-06-06 00:00" -and "2019-06-06 00:00:00". +and "2019-06-06 00:00:00". Use a range expression such as +"2019-06-06 10:00"-"2019-06-10 14:00" for matching a time range. When an integer is given, it is assumed to be a UNIX timestamp. |day| Either a day of week ("Monday", "Tuesday", etc.), or an integer between 0 and 6. Strings are matched case-insensitively, and a full match is not expected (e.g. "Mon" would match "Monday"). -When an integer is given, 0 is Sunday and 6 is Saturday. +When an integer is given, 0 is Sunday and 6 is Saturday. Use a range expression +such as "Monday"-"Wednesday" for matching a week day range. |hour| A string representing an hour in 24-hour format. Seconds can optionally be specified. -For example, 17:00 and 17:00:00 would be equivalent. +For example, 17:00 and 17:00:00 would be equivalent. Use a range expression such +as "17:00"-"19:00" for matching a time range. |============================= .Using meta expressions @@ -190,6 +193,9 @@ filter output oif eth0 # incoming packet was subject to ipsec processing raw prerouting meta ipsec exists accept + +# match incoming packet from 03:00 to 14:00 local time +raw prerouting meta hour "03:00"-"14:00" counter accept ----------------------- SOCKET EXPRESSION @@ -428,6 +434,10 @@ Destination address of the tunnel| ipv4_addr/ipv6_addr |================================= +*Note:* When using xfrm_interface, this expression is not useable in output +hook as the plain packet does not traverse it with IPsec info attached - use a +chain in postrouting hook instead. + NUMGEN EXPRESSION ~~~~~~~~~~~~~~~~~ @@ -438,7 +448,7 @@ Create a number generator. The *inc* or *random* keywords control its operation mode: In *inc* mode, the last returned value is simply incremented. In *random* mode, a new random number is returned. The value after *mod* keyword specifies an upper boundary (read: modulus) which is not reached by -returned numbers. The optional *offset* allows to increment the returned value +returned numbers. The optional *offset* allows one to increment the returned value by a fixed offset. A typical use-case for *numgen* is load-balancing: @@ -468,7 +478,7 @@ header to apply the hashing, concatenations are possible as well. The value after *mod* keyword specifies an upper boundary (read: modulus) which is not reached by returned numbers. The optional *seed* is used to specify an init value used as seed in the hashing function. The optional *offset* -allows to increment the returned value by a fixed offset. +allows one to increment the returned value by a fixed offset. A typical use-case for *jhash* and *symhash* is load-balancing: |