1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NF_CONNTRACK_SIP_H__
3 #define __NF_CONNTRACK_SIP_H__
6 #include <net/netfilter/nf_conntrack_expect.h>
8 #include <linux/types.h>
11 #define SIP_TIMEOUT 3600
13 struct nf_ct_sip_master {
14 unsigned int register_cseq;
15 unsigned int invite_cseq;
19 enum sip_expectation_classes {
20 SIP_EXPECT_SIGNALLING,
26 #define SIP_EXPECT_MAX (__SIP_EXPECT_MAX - 1)
28 struct sdp_media_type {
31 enum sip_expectation_classes class;
34 #define SDP_MEDIA_TYPE(__name, __class) \
37 .len = sizeof(__name) - 1, \
44 int (*request)(struct sk_buff *skb, unsigned int protoff,
46 const char **dptr, unsigned int *datalen,
48 int (*response)(struct sk_buff *skb, unsigned int protoff,
50 const char **dptr, unsigned int *datalen,
51 unsigned int cseq, unsigned int code);
54 #define SIP_HANDLER(__method, __request, __response) \
56 .method = (__method), \
57 .len = sizeof(__method) - 1, \
58 .request = (__request), \
59 .response = (__response), \
69 int (*match_len)(const struct nf_conn *ct,
70 const char *dptr, const char *limit,
74 #define __SIP_HDR(__name, __cname, __search, __match) \
77 .len = sizeof(__name) - 1, \
79 .clen = (__cname) ? sizeof(__cname) - 1 : 0, \
80 .search = (__search), \
81 .slen = (__search) ? sizeof(__search) - 1 : 0, \
82 .match_len = (__match), \
85 #define SIP_HDR(__name, __cname, __search, __match) \
86 __SIP_HDR(__name, __cname, __search, __match)
88 #define SDP_HDR(__name, __search, __match) \
89 __SIP_HDR(__name, NULL, __search, __match)
91 enum sip_header_types {
99 SIP_HDR_CONTENT_LENGTH,
103 enum sdp_header_types {
111 struct nf_nat_sip_hooks {
112 unsigned int (*msg)(struct sk_buff *skb,
113 unsigned int protoff,
114 unsigned int dataoff,
116 unsigned int *datalen);
118 void (*seq_adjust)(struct sk_buff *skb,
119 unsigned int protoff, s16 off);
121 unsigned int (*expect)(struct sk_buff *skb,
122 unsigned int protoff,
123 unsigned int dataoff,
125 unsigned int *datalen,
126 struct nf_conntrack_expect *exp,
127 unsigned int matchoff,
128 unsigned int matchlen);
130 unsigned int (*sdp_addr)(struct sk_buff *skb,
131 unsigned int protoff,
132 unsigned int dataoff,
134 unsigned int *datalen,
136 enum sdp_header_types type,
137 enum sdp_header_types term,
138 const union nf_inet_addr *addr);
140 unsigned int (*sdp_port)(struct sk_buff *skb,
141 unsigned int protoff,
142 unsigned int dataoff,
144 unsigned int *datalen,
145 unsigned int matchoff,
146 unsigned int matchlen,
149 unsigned int (*sdp_session)(struct sk_buff *skb,
150 unsigned int protoff,
151 unsigned int dataoff,
153 unsigned int *datalen,
155 const union nf_inet_addr *addr);
157 unsigned int (*sdp_media)(struct sk_buff *skb,
158 unsigned int protoff,
159 unsigned int dataoff,
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);
168 extern const struct nf_nat_sip_hooks *nf_nat_sip_hooks;
170 int 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,
174 int 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);
178 int 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);
183 int 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,
188 int 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);
193 int 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);
199 #endif /* __KERNEL__ */
200 #endif /* __NF_CONNTRACK_SIP_H__ */