1997-02-09 22:50:16 +00:00
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filter-rule = [ insert ] action in-out [ options ] [ tos ] [ ttl ]
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1997-11-16 04:52:19 +00:00
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[ proto ] [ ip ] [ group ].
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1997-02-09 22:50:16 +00:00
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insert = "@" decnumber .
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1997-11-16 04:52:19 +00:00
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action = block | "pass" | log | "count" | skip | auth | call .
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1997-02-09 22:50:16 +00:00
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in-out = "in" | "out" .
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options = [ log ] [ "quick" ] [ "on" interface-name [ dup ] [ froute ] ] .
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tos = "tos" decnumber | "tos" hexnumber .
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ttl = "ttl" decnumber .
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proto = "proto" protocol .
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ip = srcdst [ flags ] [ with withopt ] [ icmp ] [ keep ] .
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1997-11-16 04:52:19 +00:00
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group = [ "head" decnumber ] [ "group" decnumber ] .
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1997-02-09 22:50:16 +00:00
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block = "block" [ "return-icmp"[return-code] | "return-rst" ] .
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1997-11-16 04:52:19 +00:00
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auth = "auth" | "preauth" .
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1997-02-09 22:50:16 +00:00
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log = "log" [ "body" ] [ "first" ] [ "or-block" ] .
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call = "call" [ "now" ] function-name .
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1997-11-16 04:52:19 +00:00
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skip = "skip" decnumber .
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1997-02-09 22:50:16 +00:00
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dup = "dup-to" interface-name[":"ipaddr] .
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froute = "fastroute" | "to" interface-name .
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protocol = "tcp/udp" | "udp" | "tcp" | "icmp" | decnumber .
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srcdst = "all" | fromto .
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fromto = "from" object "to" object .
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object = addr [ port-comp | port-range ] .
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addr = "any" | nummask | host-name [ "mask" ipaddr | "mask" hexnumber ] .
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port-comp = "port" compare port-num .
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port-range = "port" port-num range port-num .
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flags = "flags" flag { flag } [ "/" flag { flag } ] .
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with = "with" | "and" .
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icmp = "icmp-type" icmp-type [ "code" decnumber ] .
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return-code = "("icmp-code")" .
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keep = "keep" "state" | "keep" "frags" .
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nummask = host-name [ "/" decnumber ] .
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host-name = ipaddr | hostname | "any" .
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ipaddr = host-num "." host-num "." host-num "." host-num .
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host-num = digit [ digit [ digit ] ] .
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port-num = service-name | decnumber .
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withopt = [ "not" | "no" ] opttype [ withopt ] .
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opttype = "ipopts" | "short" | "frag" | "opt" ipopts .
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optname = ipopts [ "," optname ] .
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ipopts = optlist | "sec-class" [ secname ] .
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secname = seclvl [ "," secname ] .
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seclvl = "unclass" | "confid" | "reserv-1" | "reserv-2" | "reserv-3" |
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"reserv-4" | "secret" | "topsecret" .
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icmp-type = "unreach" | "echo" | "echorep" | "squench" | "redir" |
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"timex" | "paramprob" | "timest" | "timestrep" | "inforeq" |
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1997-11-16 04:52:19 +00:00
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"inforep" | "maskreq" | "maskrep" | "routerad" |
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"routersol" | decnumber .
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1997-02-09 22:50:16 +00:00
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icmp-code = decumber | "net-unr" | "host-unr" | "proto-unr" | "port-unr" |
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"needfrag" | "srcfail" | "net-unk" | "host-unk" | "isolate" |
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"net-prohib" | "host-prohib" | "net-tos" | "host-tos" .
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optlist = "nop" | "rr" | "zsu" | "mtup" | "mtur" | "encode" | "ts" | "tr" |
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"sec" | "lsrr" | "e-sec" | "cipso" | "satid" | "ssrr" | "addext" |
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"visa" | "imitd" | "eip" | "finn" .
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hexnumber = "0" "x" hexstring .
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hexstring = hexdigit [ hexstring ] .
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decnumber = digit [ decnumber ] .
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compare = "=" | "!=" | "<" | ">" | "<=" | ">=" | "eq" | "ne" | "lt" | "gt" |
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"le" | "ge" .
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range = "<>" | "><" .
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hexdigit = digit | "a" | "b" | "c" | "d" | "e" | "f" .
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digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" .
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flag = "F" | "S" | "R" | "P" | "A" | "U" .
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