1#ifndef __NF_CONNTRACK_SIP_H__
2#define __NF_CONNTRACK_SIP_H__
3#ifdef __KERNEL__
4
5#include <net/netfilter/nf_conntrack_expect.h>
6
7#define SIP_PORT 5060
8#define SIP_TIMEOUT 3600
9
10struct nf_ct_sip_master {
11 unsigned int register_cseq;
12 unsigned int invite_cseq;
13};
14
15enum sip_expectation_classes {
16 SIP_EXPECT_SIGNALLING,
17 SIP_EXPECT_AUDIO,
18 SIP_EXPECT_VIDEO,
19 SIP_EXPECT_IMAGE,
20 __SIP_EXPECT_MAX
21};
22#define SIP_EXPECT_MAX (__SIP_EXPECT_MAX - 1)
23
24struct sdp_media_type {
25 const char *name;
26 unsigned int len;
27 enum sip_expectation_classes class;
28};
29
30#define SDP_MEDIA_TYPE(__name, __class) \
31{ \
32 .name = (__name), \
33 .len = sizeof(__name) - 1, \
34 .class = (__class), \
35}
36
37struct sip_handler {
38 const char *method;
39 unsigned int len;
40 int (*request)(struct sk_buff *skb, unsigned int protoff,
41 unsigned int dataoff,
42 const char **dptr, unsigned int *datalen,
43 unsigned int cseq);
44 int (*response)(struct sk_buff *skb, unsigned int protoff,
45 unsigned int dataoff,
46 const char **dptr, unsigned int *datalen,
47 unsigned int cseq, unsigned int code);
48};
49
50#define SIP_HANDLER(__method, __request, __response) \
51{ \
52 .method = (__method), \
53 .len = sizeof(__method) - 1, \
54 .request = (__request), \
55 .response = (__response), \
56}
57
58struct sip_header {
59 const char *name;
60 const char *cname;
61 const char *search;
62 unsigned int len;
63 unsigned int clen;
64 unsigned int slen;
65 int (*match_len)(const struct nf_conn *ct,
66 const char *dptr, const char *limit,
67 int *shift);
68};
69
70#define __SIP_HDR(__name, __cname, __search, __match) \
71{ \
72 .name = (__name), \
73 .len = sizeof(__name) - 1, \
74 .cname = (__cname), \
75 .clen = (__cname) ? sizeof(__cname) - 1 : 0, \
76 .search = (__search), \
77 .slen = (__search) ? sizeof(__search) - 1 : 0, \
78 .match_len = (__match), \
79}
80
81#define SIP_HDR(__name, __cname, __search, __match) \
82 __SIP_HDR(__name, __cname, __search, __match)
83
84#define SDP_HDR(__name, __search, __match) \
85 __SIP_HDR(__name, NULL, __search, __match)
86
87enum sip_header_types {
88 SIP_HDR_CSEQ,
89 SIP_HDR_FROM,
90 SIP_HDR_TO,
91 SIP_HDR_CONTACT,
92 SIP_HDR_VIA_UDP,
93 SIP_HDR_VIA_TCP,
94 SIP_HDR_EXPIRES,
95 SIP_HDR_CONTENT_LENGTH,
96 SIP_HDR_CALL_ID,
97};
98
99enum sdp_header_types {
100 SDP_HDR_UNSPEC,
101 SDP_HDR_VERSION,
102 SDP_HDR_OWNER,
103 SDP_HDR_CONNECTION,
104 SDP_HDR_MEDIA,
105};
106
107extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
108 unsigned int protoff,
109 unsigned int dataoff,
110 const char **dptr,
111 unsigned int *datalen);
112extern void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb,
113 unsigned int protoff, s16 off);
114extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
115 unsigned int protoff,
116 unsigned int dataoff,
117 const char **dptr,
118 unsigned int *datalen,
119 struct nf_conntrack_expect *exp,
120 unsigned int matchoff,
121 unsigned int matchlen);
122extern unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb,
123 unsigned int protoff,
124 unsigned int dataoff,
125 const char **dptr,
126 unsigned int *datalen,
127 unsigned int sdpoff,
128 enum sdp_header_types type,
129 enum sdp_header_types term,
130 const union nf_inet_addr *addr);
131extern unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb,
132 unsigned int protoff,
133 unsigned int dataoff,
134 const char **dptr,
135 unsigned int *datalen,
136 unsigned int matchoff,
137 unsigned int matchlen,
138 u_int16_t port);
139extern unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb,
140 unsigned int protoff,
141 unsigned int dataoff,
142 const char **dptr,
143 unsigned int *datalen,
144 unsigned int sdpoff,
145 const union nf_inet_addr *addr);
146extern unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb,
147 unsigned int protoff,
148 unsigned int dataoff,
149 const char **dptr,
150 unsigned int *datalen,
151 struct nf_conntrack_expect *rtp_exp,
152 struct nf_conntrack_expect *rtcp_exp,
153 unsigned int mediaoff,
154 unsigned int medialen,
155 union nf_inet_addr *rtp_addr);
156
157extern int ct_sip_parse_request(const struct nf_conn *ct,
158 const char *dptr, unsigned int datalen,
159 unsigned int *matchoff, unsigned int *matchlen,
160 union nf_inet_addr *addr, __be16 *port);
161extern int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
162 unsigned int dataoff, unsigned int datalen,
163 enum sip_header_types type,
164 unsigned int *matchoff, unsigned int *matchlen);
165extern int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
166 unsigned int *dataoff, unsigned int datalen,
167 enum sip_header_types type, int *in_header,
168 unsigned int *matchoff, unsigned int *matchlen,
169 union nf_inet_addr *addr, __be16 *port);
170extern int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
171 unsigned int dataoff, unsigned int datalen,
172 const char *name,
173 unsigned int *matchoff, unsigned int *matchlen,
174 union nf_inet_addr *addr, bool delim);
175extern int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
176 unsigned int off, unsigned int datalen,
177 const char *name,
178 unsigned int *matchoff, unsigned int *matchen,
179 unsigned int *val);
180
181extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
182 unsigned int dataoff, unsigned int datalen,
183 enum sdp_header_types type,
184 enum sdp_header_types term,
185 unsigned int *matchoff, unsigned int *matchlen);
186
187#endif
188#endif
189
