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Diffstat (limited to 'doc/bird.sgml')
| -rw-r--r-- | doc/bird.sgml | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml index 2f65f13..8b2e8ee 100644 --- a/doc/bird.sgml +++ b/doc/bird.sgml @@ -706,9 +706,21 @@ incompatible with each other (that is to prevent you from shooting in the foot). Filters recognize four types of sets. Sets are similar to strings: you can pass them around but you can't modify them. Literals of type <cf>int set</cf> look like <cf> [ 1, 2, 5..7 ]</cf>. As you can see, both simple values and ranges are permitted in - sets. For pair sets, expressions like <cf/(123,*)/ can be used to denote ranges (in + sets. + For pair sets, expressions like <cf/(123,*)/ can be used to denote ranges (in that case <cf/(123,0)..(123,65535)/). You can also use <cf/(123,5..100/ for range <cf/(123,5)..(123,100)/. + You can also use expressions for both, pair sets and int sets. However it must + be possible to evaluate these expressions before daemon boots. So you can use + only constants inside them. E.g. + <code> + define one=1; + int set odds; + pair set ps; + + odds = [ one, (2+1), (6-one), (2*2*2-1), 9, 11 ]; + ps = [ (1,(one+one)), (3,4)..(4,8), (5,*), (6,3..6) ]; + </code> Sets of prefixes are special: their literals does not allow ranges, but allows prefix patterns that are written as <cf><M>ipaddress</M>/<M>pxlen</M>{<M>low</M>,<M>high</M>}</cf>. |