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[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: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-03-25 20:24:24 -07:00 committed by David S. Miller
parent 9467ee380a
commit 2bbb21168a
2 changed files with 68 additions and 0 deletions
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10
include/linux/netfilter/nf_conntrack_sip.h
View File

@ -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,

58
net/netfilter/nf_conntrack_sip.c
View File

@ -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.