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Commit 2bbb2116 authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

[NETFILTER]: nf_conntrack_sip: introduce URI and header parameter parsing helpers 



Introduce URI and header parameter parsing helpers. These are needed
by the conntrack helper to parse expiration values in Contact: header
parameters and by the NAT helper to properly update the Via-header
rport=, received= and maddr= parameters.

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9467ee38

include/linux/netfilter/nf_conntrack_sip.h

+10 −0
Original line number Diff line number Diff line
@@ -93,6 +93,16 @@ extern int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr, 
				   enum sip_header_types type, int *in_header,

				   unsigned int *matchoff, unsigned int *matchlen,

				   union nf_inet_addr *addr, __be16 *port);

extern int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,

				      unsigned int dataoff, unsigned int datalen,

				      const char *name,

				      unsigned int *matchoff, unsigned int *matchlen,

				      union nf_inet_addr *addr);

extern int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,

					unsigned int off, unsigned int datalen,

					const char *name,

					unsigned int *matchoff, unsigned int *matchen,

					unsigned int *val);



extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,

				 unsigned int dataoff, unsigned int datalen,

net/netfilter/nf_conntrack_sip.c

+58 −0
Original line number Diff line number Diff line
@@ -448,6 +448,64 @@ int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr, 
}

EXPORT_SYMBOL_GPL(ct_sip_parse_header_uri);



/* Parse address from header parameter and return address, offset and length */

int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,

			       unsigned int dataoff, unsigned int datalen,

			       const char *name,

			       unsigned int *matchoff, unsigned int *matchlen,

			       union nf_inet_addr *addr)

{

	const char *limit = dptr + datalen;

	const char *start, *end;



	limit = ct_sip_header_search(dptr + dataoff, limit, ",", strlen(","));

	if (!limit)

		limit = dptr + datalen;



	start = ct_sip_header_search(dptr + dataoff, limit, name, strlen(name));

	if (!start)

		return 0;



	start += strlen(name);

	if (!parse_addr(ct, start, &end, addr, limit))

		return 0;

	*matchoff = start - dptr;

	*matchlen = end - start;

	return 1;

}

EXPORT_SYMBOL_GPL(ct_sip_parse_address_param);



/* Parse numerical header parameter and return value, offset and length */

int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,

				 unsigned int dataoff, unsigned int datalen,

				 const char *name,

				 unsigned int *matchoff, unsigned int *matchlen,

				 unsigned int *val)

{

	const char *limit = dptr + datalen;

	const char *start;

	char *end;



	limit = ct_sip_header_search(dptr + dataoff, limit, ",", strlen(","));

	if (!limit)

		limit = dptr + datalen;



	start = ct_sip_header_search(dptr + dataoff, limit, name, strlen(name));

	if (!start)

		return 0;



	start += strlen(name);

	*val = simple_strtoul(start, &end, 0);

	if (start == end)

		return 0;

	if (matchoff && matchlen) {

		*matchoff = start - dptr;

		*matchlen = end - start;

	}

	return 1;

}

EXPORT_SYMBOL_GPL(ct_sip_parse_numerical_param);



/* SDP header parsing: a SDP session description contains an ordered set of

 * headers, starting with a section containing general session parameters,

 * optionally followed by multiple media descriptions.