Commit 001985b2 authored by Simon Horman's avatar Simon Horman
Browse files

netfilter: nf_conntrack_sip: Add callid parser 



Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
Acked-by: default avatarJulian Anastasov <ja@ssi.bg>
parent 5adbb9fb

include/linux/netfilter/nf_conntrack_sip.h

+1 −0
Original line number Diff line number Diff line
@@ -89,6 +89,7 @@ enum sip_header_types { 
	SIP_HDR_VIA_TCP,

	SIP_HDR_EXPIRES,

	SIP_HDR_CONTENT_LENGTH,

	SIP_HDR_CALL_ID,

};



enum sdp_header_types {

net/netfilter/nf_conntrack_sip.c

+39 −0
Original line number Diff line number Diff line
@@ -130,6 +130,44 @@ static int digits_len(const struct nf_conn *ct, const char *dptr, 
	return len;

}



static int iswordc(const char c)

{

	if (isalnum(c) || c == '!' || c == '"' || c == '%' ||

	    (c >= '(' && c <= '/') || c == ':' || c == '<' || c == '>' ||

	    c == '?' || (c >= '[' && c <= ']') || c == '_' || c == '`' ||

	    c == '{' || c == '}' || c == '~')

		return 1;

	return 0;

}



static int word_len(const char *dptr, const char *limit)

{

	int len = 0;

	while (dptr < limit && iswordc(*dptr)) {

		dptr++;

		len++;

	}

	return len;

}



static int callid_len(const struct nf_conn *ct, const char *dptr,

		      const char *limit, int *shift)

{

	int len, domain_len;



	len = word_len(dptr, limit);

	dptr += len;

	if (!len || dptr == limit || *dptr != '@')

		return len;

	dptr++;

	len++;



	domain_len = word_len(dptr, limit);

	if (!domain_len)

		return 0;

	return len + domain_len;

}



/* get media type + port length */

static int media_len(const struct nf_conn *ct, const char *dptr,

		     const char *limit, int *shift)
@@ -299,6 +337,7 @@ static const struct sip_header ct_sip_hdrs[] = { 
	[SIP_HDR_VIA_TCP]		= SIP_HDR("Via", "v", "TCP ", epaddr_len),

	[SIP_HDR_EXPIRES]		= SIP_HDR("Expires", NULL, NULL, digits_len),

	[SIP_HDR_CONTENT_LENGTH]	= SIP_HDR("Content-Length", "l", NULL, digits_len),

	[SIP_HDR_CALL_ID]		= SIP_HDR("Call-Id", "i", NULL, callid_len),

};



static const char *sip_follow_continuation(const char *dptr, const char *limit)