On Tue, Aug 30, 2016 at 06:52:22PM +0200, Marco Angaroni wrote:
> Current parsing methods for SIP headers do not allow the presence of
> tab characters between header name and header value. As a result Call-ID
> SIP headers like the following are discarded by IPVS SIP persistence
> engine:
>
> "Call-ID\t: mycallid@abcde"
> "Call-ID:\tmycallid@abcde"
>
> In above examples Call-IDs are represented as strings in C language.
> Obviously in real message we have byte "09" before/after colon (":").
>
> Proposed fix is in nf_conntrack_sip module.
> Function sip_skip_whitespace() should skip tabs in addition to spaces,
> since in SIP grammar whitespace (WSP) corresponds to space or tab.
>
> Below is an extract of relevant SIP ABNF syntax.
>
> Call-ID = ( "Call-ID" / "i" ) HCOLON callid
> callid = word [ "@" word ]
>
> HCOLON = *( SP / HTAB ) ":" SWS
> SWS = [LWS] ; sep whitespace
> LWS = [*WSP CRLF] 1*WSP ; linear whitespace
> WSP = SP / HTAB
> word = 1*(alphanum / "-" / "." / "!" / "%" / "*" /
> "_" / "+" / "`" / "'" / "~" /
> "(" / ")" / "<" / ">" /
> ":" / "\" / DQUOTE /
> "/" / "[" / "]" / "?" /
> "{" / "}" )
Applied this one too. I got confused because patch 0/x is usually the
cover letter, I suggest you don't use 0/x for patch series in the future.
Thanks!
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