1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __NF_CONNTRACK_SIP_H__
3#define __NF_CONNTRACK_SIP_H__
4#ifdef __KERNEL__
5
6#include <net/netfilter/nf_conntrack_expect.h>
7
8#include <linux/types.h>
9
10#define SIP_PORT 5060
11#define SIP_TIMEOUT 3600
12
13struct nf_ct_sip_master {
14 unsigned int register_cseq;
15 unsigned int invite_cseq;
16 __be16 forced_dport;
17};
18
19enum sip_expectation_classes {
20 SIP_EXPECT_SIGNALLING,
21 SIP_EXPECT_AUDIO,
22 SIP_EXPECT_VIDEO,
23 SIP_EXPECT_IMAGE,
24 __SIP_EXPECT_MAX
25};
26#define SIP_EXPECT_MAX (__SIP_EXPECT_MAX - 1)
27
28struct sdp_media_type {
29 const char *name;
30 unsigned int len;
31 enum sip_expectation_classes class;
32};
33
34#define SDP_MEDIA_TYPE(__name, __class) \
35{ \
36 .name = (__name), \
37 .len = sizeof(__name) - 1, \
38 .class = (__class), \
39}
40
41struct sip_handler {
42 const char *method;
43 unsigned int len;
44 int (*request)(struct sk_buff *skb, unsigned int protoff,
45 unsigned int dataoff,
46 const char **dptr, unsigned int *datalen,
47 unsigned int cseq);
48 int (*response)(struct sk_buff *skb, unsigned int protoff,
49 unsigned int dataoff,
50 const char **dptr, unsigned int *datalen,
51 unsigned int cseq, unsigned int code);
52};
53
54#define SIP_HANDLER(__method, __request, __response) \
55{ \
56 .method = (__method), \
57 .len = sizeof(__method) - 1, \
58 .request = (__request), \
59 .response = (__response), \
60}
61
62struct sip_header {
63 const char *name;
64 const char *cname;
65 const char *search;
66 unsigned int len;
67 unsigned int clen;
68 unsigned int slen;
69 int (*match_len)(const struct nf_conn *ct,
70 const char *dptr, const char *limit,
71 int *shift);
72};
73
74#define __SIP_HDR(__name, __cname, __search, __match) \
75{ \
76 .name = (__name), \
77 .len = sizeof(__name) - 1, \
78 .cname = (__cname), \
79 .clen = (__cname) ? sizeof(__cname) - 1 : 0, \
80 .search = (__search), \
81 .slen = (__search) ? sizeof(__search) - 1 : 0, \
82 .match_len = (__match), \
83}
84
85#define SIP_HDR(__name, __cname, __search, __match) \
86 __SIP_HDR(__name, __cname, __search, __match)
87
88#define SDP_HDR(__name, __search, __match) \
89 __SIP_HDR(__name, NULL, __search, __match)
90
91enum sip_header_types {
92 SIP_HDR_CSEQ,
93 SIP_HDR_FROM,
94 SIP_HDR_TO,
95 SIP_HDR_CONTACT,
96 SIP_HDR_VIA_UDP,
97 SIP_HDR_VIA_TCP,
98 SIP_HDR_EXPIRES,
99 SIP_HDR_CONTENT_LENGTH,
100 SIP_HDR_CALL_ID,
101};
102
103enum sdp_header_types {
104 SDP_HDR_UNSPEC,
105 SDP_HDR_VERSION,
106 SDP_HDR_OWNER,
107 SDP_HDR_CONNECTION,
108 SDP_HDR_MEDIA,
109};
110
111struct nf_nat_sip_hooks {
112 unsigned int (*msg)(struct sk_buff *skb,
113 unsigned int protoff,
114 unsigned int dataoff,
115 const char **dptr,
116 unsigned int *datalen);
117
118 void (*seq_adjust)(struct sk_buff *skb,
119 unsigned int protoff, s16 off);
120
121 unsigned int (*expect)(struct sk_buff *skb,
122 unsigned int protoff,
123 unsigned int dataoff,
124 const char **dptr,
125 unsigned int *datalen,
126 struct nf_conntrack_expect *exp,
127 unsigned int matchoff,
128 unsigned int matchlen);
129
130 unsigned int (*sdp_addr)(struct sk_buff *skb,
131 unsigned int protoff,
132 unsigned int dataoff,
133 const char **dptr,
134 unsigned int *datalen,
135 unsigned int sdpoff,
136 enum sdp_header_types type,
137 enum sdp_header_types term,
138 const union nf_inet_addr *addr);
139
140 unsigned int (*sdp_port)(struct sk_buff *skb,
141 unsigned int protoff,
142 unsigned int dataoff,
143 const char **dptr,
144 unsigned int *datalen,
145 unsigned int matchoff,
146 unsigned int matchlen,
147 u_int16_t port);
148
149 unsigned int (*sdp_session)(struct sk_buff *skb,
150 unsigned int protoff,
151 unsigned int dataoff,
152 const char **dptr,
153 unsigned int *datalen,
154 unsigned int sdpoff,
155 const union nf_inet_addr *addr);
156
157 unsigned int (*sdp_media)(struct sk_buff *skb,
158 unsigned int protoff,
159 unsigned int dataoff,
160 const char **dptr,
161 unsigned int *datalen,
162 struct nf_conntrack_expect *rtp_exp,
163 struct nf_conntrack_expect *rtcp_exp,
164 unsigned int mediaoff,
165 unsigned int medialen,
166 union nf_inet_addr *rtp_addr);
167};
168extern const struct nf_nat_sip_hooks *nf_nat_sip_hooks;
169
170int ct_sip_parse_request(const struct nf_conn *ct, const char *dptr,
171 unsigned int datalen, unsigned int *matchoff,
172 unsigned int *matchlen, union nf_inet_addr *addr,
173 __be16 *port);
174int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
175 unsigned int dataoff, unsigned int datalen,
176 enum sip_header_types type, unsigned int *matchoff,
177 unsigned int *matchlen);
178int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
179 unsigned int *dataoff, unsigned int datalen,
180 enum sip_header_types type, int *in_header,
181 unsigned int *matchoff, unsigned int *matchlen,
182 union nf_inet_addr *addr, __be16 *port);
183int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
184 unsigned int dataoff, unsigned int datalen,
185 const char *name, unsigned int *matchoff,
186 unsigned int *matchlen, union nf_inet_addr *addr,
187 bool delim);
188int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
189 unsigned int off, unsigned int datalen,
190 const char *name, unsigned int *matchoff,
191 unsigned int *matchen, unsigned int *val);
192
193int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
194 unsigned int dataoff, unsigned int datalen,
195 enum sdp_header_types type,
196 enum sdp_header_types term,
197 unsigned int *matchoff, unsigned int *matchlen);
198
199#endif /* __KERNEL__ */
200#endif /* __NF_CONNTRACK_SIP_H__ */
201