[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>
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 8e7e5b4..126f308 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -448,6 +448,64 @@
}
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.