1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NF_CONNTRACK_SIP_H__
3 #define __NF_CONNTRACK_SIP_H__
5 #include <linux/skbuff.h>
6 #include <linux/types.h>
7 #include <net/netfilter/nf_conntrack_expect.h>
10 #define SIP_TIMEOUT 3600
12 struct nf_ct_sip_master {
13 unsigned int register_cseq;
14 unsigned int invite_cseq;
18 enum sip_expectation_classes {
19 SIP_EXPECT_SIGNALLING,
25 #define SIP_EXPECT_MAX (__SIP_EXPECT_MAX - 1)
27 struct sdp_media_type {
30 enum sip_expectation_classes class;
33 #define SDP_MEDIA_TYPE(__name, __class) \
36 .len = sizeof(__name) - 1, \
43 int (*request)(struct sk_buff *skb, unsigned int protoff,
45 const char **dptr, unsigned int *datalen,
47 int (*response)(struct sk_buff *skb, unsigned int protoff,
49 const char **dptr, unsigned int *datalen,
50 unsigned int cseq, unsigned int code);
53 #define SIP_HANDLER(__method, __request, __response) \
55 .method = (__method), \
56 .len = sizeof(__method) - 1, \
57 .request = (__request), \
58 .response = (__response), \
68 int (*match_len)(const struct nf_conn *ct,
69 const char *dptr, const char *limit,
73 #define __SIP_HDR(__name, __cname, __search, __match) \
76 .len = sizeof(__name) - 1, \
78 .clen = (__cname) ? sizeof(__cname) - 1 : 0, \
79 .search = (__search), \
80 .slen = (__search) ? sizeof(__search) - 1 : 0, \
81 .match_len = (__match), \
84 #define SIP_HDR(__name, __cname, __search, __match) \
85 __SIP_HDR(__name, __cname, __search, __match)
87 #define SDP_HDR(__name, __search, __match) \
88 __SIP_HDR(__name, NULL, __search, __match)
90 enum sip_header_types {
98 SIP_HDR_CONTENT_LENGTH,
102 enum sdp_header_types {
110 struct nf_nat_sip_hooks {
111 unsigned int (*msg)(struct sk_buff *skb,
112 unsigned int protoff,
113 unsigned int dataoff,
115 unsigned int *datalen);
117 void (*seq_adjust)(struct sk_buff *skb,
118 unsigned int protoff, s16 off);
120 unsigned int (*expect)(struct sk_buff *skb,
121 unsigned int protoff,
122 unsigned int dataoff,
124 unsigned int *datalen,
125 struct nf_conntrack_expect *exp,
126 unsigned int matchoff,
127 unsigned int matchlen);
129 unsigned int (*sdp_addr)(struct sk_buff *skb,
130 unsigned int protoff,
131 unsigned int dataoff,
133 unsigned int *datalen,
135 enum sdp_header_types type,
136 enum sdp_header_types term,
137 const union nf_inet_addr *addr);
139 unsigned int (*sdp_port)(struct sk_buff *skb,
140 unsigned int protoff,
141 unsigned int dataoff,
143 unsigned int *datalen,
144 unsigned int matchoff,
145 unsigned int matchlen,
148 unsigned int (*sdp_session)(struct sk_buff *skb,
149 unsigned int protoff,
150 unsigned int dataoff,
152 unsigned int *datalen,
154 const union nf_inet_addr *addr);
156 unsigned int (*sdp_media)(struct sk_buff *skb,
157 unsigned int protoff,
158 unsigned int dataoff,
160 unsigned int *datalen,
161 struct nf_conntrack_expect *rtp_exp,
162 struct nf_conntrack_expect *rtcp_exp,
163 unsigned int mediaoff,
164 unsigned int medialen,
165 union nf_inet_addr *rtp_addr);
167 extern const struct nf_nat_sip_hooks *nf_nat_sip_hooks;
169 int ct_sip_parse_request(const struct nf_conn *ct, const char *dptr,
170 unsigned int datalen, unsigned int *matchoff,
171 unsigned int *matchlen, union nf_inet_addr *addr,
173 int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
174 unsigned int dataoff, unsigned int datalen,
175 enum sip_header_types type, unsigned int *matchoff,
176 unsigned int *matchlen);
177 int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
178 unsigned int *dataoff, unsigned int datalen,
179 enum sip_header_types type, int *in_header,
180 unsigned int *matchoff, unsigned int *matchlen,
181 union nf_inet_addr *addr, __be16 *port);
182 int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
183 unsigned int dataoff, unsigned int datalen,
184 const char *name, unsigned int *matchoff,
185 unsigned int *matchlen, union nf_inet_addr *addr,
187 int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
188 unsigned int off, unsigned int datalen,
189 const char *name, unsigned int *matchoff,
190 unsigned int *matchen, unsigned int *val);
192 int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
193 unsigned int dataoff, unsigned int datalen,
194 enum sdp_header_types type,
195 enum sdp_header_types term,
196 unsigned int *matchoff, unsigned int *matchlen);
198 #endif /* __NF_CONNTRACK_SIP_H__ */