netdev - iproute2, meta, flex parser bug?

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Date:	Thu, 29 Jan 2009 13:04:24 +0200
From:	Denys Fedoryschenko <denys@...p.net.lb>
To:	netdev@...r.kernel.org
Cc:	Stephen Hemminger <shemminger@...tta.com>
Subject: iproute2, meta, flex parser bug?

I'm trying to make meta work, without success. Seems parser done in flex 
failing. My knowledge is not enough to fix or understand how flex is working
Here is what i got:

home iproute2 # home iproute2 # tc/tc filter add dev eth0 protocol ip pref 11 
basic match meta\(rt_iif eq \"eth0\"\)
meta: unknown meta id

... meta(rt_iif >>eq<< ...
... meta(rt_iif eq >>"eth0"<<)...
Usage: meta(OBJECT { eq | lt | gt } OBJECT)
where: OBJECT  := { META_ID | VALUE }
       META_ID := id [ shift SHIFT ] [ mask MASK ]

Example: meta(nfmark gt 24)
         meta(indev shift 1 eq "ppp")
         meta(tcindex mask 0xf0 eq 0xf0)

For a list of meta identifiers, use meta(list).
Illegal "ematch"

I try with debug, and how flex is working - strange for me
--(end of buffer or a NUL)
--accepting rule at line 139 ("meta")
--accepting rule at line 135 ("(")
--accepting rule at line 139 ("rt_iif")
--(end of buffer or a NUL)
--accepting rule at line 70 (" ")
--accepting rule at line 139 ("eq")
--(end of buffer or a NUL)
--accepting rule at line 70 (" ")
--accepting rule at line 139 (""eth0"")
--accepting rule at line 136 (")")
--(end of buffer or a NUL)
--accepting rule at line 70 (" ")
--(end of buffer or a NUL)
--EOF (start condition 0)

Even with numbers
tc/tc filter add dev eth0 protocol ip pref 11 basic match meta\(rt_iif eq 
123\)
--(end of buffer or a NUL)
--accepting rule at line 139 ("meta")
--accepting rule at line 135 ("(")
--accepting rule at line 139 ("rt_iif")
--(end of buffer or a NUL)
--accepting rule at line 70 (" ")
--accepting rule at line 139 ("eq")
--(end of buffer or a NUL)
--accepting rule at line 70 (" ")
--accepting rule at line 139 ("123")
--accepting rule at line 136 (")")
--(end of buffer or a NUL)
--accepting rule at line 70 (" ")
--(end of buffer or a NUL)
--EOF (start condition 0)

It seems it is not matching any rules except 

70 [ \t\r\n]+
136 ")"                                   
139 [^ \t\r\n()]+                        

In flex rules all looks correct, but maybe i miss something.
My software versions
bison (GNU Bison) 2.3
flex 2.5.35
gcc version 4.3.2 (Gentoo 4.3.2 p1.2)
iproute2 is latest git
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