[NETFILTER]: nf_conntrack/nf_nat: add SIP helper port

Add IPv4 and IPv6 capable nf_conntrack port of the SIP conntrack/NAT helper.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 41 insertions, 0 deletions

diff --git a/include/linux/netfilter/nf_conntrack_sip.h b/include/linux/netfilter/nf_conntrack_sip.h
new file mode 100644
index 000000000000..bb7f2041db74
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_sip.h
@@ -0,0 +1,41 @@
+#ifndef __NF_CONNTRACK_SIP_H__
+#define __NF_CONNTRACK_SIP_H__
+#ifdef __KERNEL__
+
+#define SIP_PORT        5060
+#define SIP_TIMEOUT     3600
+
+enum sip_header_pos {
+        POS_REG_REQ_URI,
+        POS_REQ_URI,
+        POS_FROM,
+        POS_TO,
+        POS_VIA,
+        POS_CONTACT,
+        POS_CONTENT,
+        POS_MEDIA,
+        POS_OWNER_IP4,
+        POS_CONNECTION_IP4,
+        POS_OWNER_IP6,
+        POS_CONNECTION_IP6,
+        POS_SDP_HEADER,
+};
+
+extern unsigned int (*nf_nat_sip_hook)(struct sk_buff **pskb,
+                                       enum ip_conntrack_info ctinfo,
+                                       struct nf_conn *ct,
+                                       const char **dptr);
+extern unsigned int (*nf_nat_sdp_hook)(struct sk_buff **pskb,
+                                       enum ip_conntrack_info ctinfo,
+                                       struct nf_conntrack_expect *exp,
+                                       const char *dptr);
+
+extern int ct_sip_get_info(struct nf_conn *ct, const char *dptr, size_t dlen,
+                           unsigned int *matchoff, unsigned int *matchlen,
+                           enum sip_header_pos pos);
+extern int ct_sip_lnlen(const char *line, const char *limit);
+extern const char *ct_sip_search(const char *needle, const char *haystack,
+                                 size_t needle_len, size_t haystack_len,
+                                 int case_sensitive);
+#endif /* __KERNEL__ */
+#endif /* __NF_CONNTRACK_SIP_H__ */