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![Patrick McHardy](/assets/img/avatar_default.png)
Some Inovaphone PBXs exhibit very stange behaviour: when dialing for example "123", the device sends INVITE requests for "1", "12" and "123" back to back. The first requests will elicit error responses from the receiver, causing the SIP helper to flush the RTP expectations even though we might still see a positive response. Note the sequence number of the last INVITE request that contained a media description and only flush the expectations when receiving a negative response for that sequence number. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
169 lines
5 KiB
C
169 lines
5 KiB
C
#ifndef __NF_CONNTRACK_SIP_H__
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#define __NF_CONNTRACK_SIP_H__
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#ifdef __KERNEL__
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#define SIP_PORT 5060
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#define SIP_TIMEOUT 3600
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struct nf_ct_sip_master {
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unsigned int register_cseq;
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unsigned int invite_cseq;
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};
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enum sip_expectation_classes {
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SIP_EXPECT_SIGNALLING,
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SIP_EXPECT_AUDIO,
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SIP_EXPECT_VIDEO,
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__SIP_EXPECT_MAX
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};
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#define SIP_EXPECT_MAX (__SIP_EXPECT_MAX - 1)
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struct sdp_media_type {
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const char *name;
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unsigned int len;
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enum sip_expectation_classes class;
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};
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#define SDP_MEDIA_TYPE(__name, __class) \
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{ \
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.name = (__name), \
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.len = sizeof(__name) - 1, \
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.class = (__class), \
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}
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struct sip_handler {
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const char *method;
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unsigned int len;
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int (*request)(struct sk_buff *skb,
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const char **dptr, unsigned int *datalen,
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unsigned int cseq);
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int (*response)(struct sk_buff *skb,
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const char **dptr, unsigned int *datalen,
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unsigned int cseq, unsigned int code);
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};
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#define SIP_HANDLER(__method, __request, __response) \
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{ \
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.method = (__method), \
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.len = sizeof(__method) - 1, \
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.request = (__request), \
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.response = (__response), \
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}
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struct sip_header {
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const char *name;
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const char *cname;
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const char *search;
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unsigned int len;
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unsigned int clen;
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unsigned int slen;
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int (*match_len)(const struct nf_conn *ct,
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const char *dptr, const char *limit,
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int *shift);
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};
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#define __SIP_HDR(__name, __cname, __search, __match) \
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{ \
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.name = (__name), \
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.len = sizeof(__name) - 1, \
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.cname = (__cname), \
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.clen = (__cname) ? sizeof(__cname) - 1 : 0, \
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.search = (__search), \
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.slen = (__search) ? sizeof(__search) - 1 : 0, \
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.match_len = (__match), \
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}
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#define SIP_HDR(__name, __cname, __search, __match) \
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__SIP_HDR(__name, __cname, __search, __match)
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#define SDP_HDR(__name, __search, __match) \
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__SIP_HDR(__name, NULL, __search, __match)
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enum sip_header_types {
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SIP_HDR_CSEQ,
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SIP_HDR_FROM,
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SIP_HDR_TO,
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SIP_HDR_CONTACT,
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SIP_HDR_VIA,
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SIP_HDR_EXPIRES,
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SIP_HDR_CONTENT_LENGTH,
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};
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enum sdp_header_types {
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SDP_HDR_UNSPEC,
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SDP_HDR_VERSION,
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SDP_HDR_OWNER_IP4,
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SDP_HDR_CONNECTION_IP4,
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SDP_HDR_OWNER_IP6,
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SDP_HDR_CONNECTION_IP6,
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SDP_HDR_MEDIA,
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};
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extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
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const char **dptr,
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unsigned int *datalen);
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extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
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const char **dptr,
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unsigned int *datalen,
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struct nf_conntrack_expect *exp,
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unsigned int matchoff,
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unsigned int matchlen);
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extern unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb,
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const char **dptr,
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unsigned int dataoff,
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unsigned int *datalen,
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enum sdp_header_types type,
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enum sdp_header_types term,
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const union nf_inet_addr *addr);
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extern unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb,
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const char **dptr,
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unsigned int *datalen,
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unsigned int matchoff,
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unsigned int matchlen,
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u_int16_t port);
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extern unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb,
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const char **dptr,
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unsigned int dataoff,
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unsigned int *datalen,
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const union nf_inet_addr *addr);
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extern unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb,
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const char **dptr,
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unsigned int *datalen,
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struct nf_conntrack_expect *rtp_exp,
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struct nf_conntrack_expect *rtcp_exp,
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unsigned int mediaoff,
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unsigned int medialen,
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union nf_inet_addr *rtp_addr);
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extern int ct_sip_parse_request(const struct nf_conn *ct,
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const char *dptr, unsigned int datalen,
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unsigned int *matchoff, unsigned int *matchlen,
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union nf_inet_addr *addr, __be16 *port);
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extern int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
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unsigned int dataoff, unsigned int datalen,
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enum sip_header_types type,
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unsigned int *matchoff, unsigned int *matchlen);
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extern int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
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unsigned int *dataoff, unsigned int datalen,
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enum sip_header_types type, int *in_header,
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unsigned int *matchoff, unsigned int *matchlen,
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union nf_inet_addr *addr, __be16 *port);
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extern int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
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unsigned int dataoff, unsigned int datalen,
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const char *name,
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unsigned int *matchoff, unsigned int *matchlen,
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union nf_inet_addr *addr);
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extern int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
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unsigned int off, unsigned int datalen,
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const char *name,
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unsigned int *matchoff, unsigned int *matchen,
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unsigned int *val);
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extern int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
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unsigned int dataoff, unsigned int datalen,
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enum sdp_header_types type,
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enum sdp_header_types term,
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unsigned int *matchoff, unsigned int *matchlen);
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#endif /* __KERNEL__ */
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#endif /* __NF_CONNTRACK_SIP_H__ */
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