netfilter: nf_conntrack_sip: Add callid parser
Signed-off-by: Simon Horman <horms@verge.net.au> Acked-by: Julian Anastasov <ja@ssi.bg>
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@ -89,6 +89,7 @@ enum sip_header_types {
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SIP_HDR_VIA_TCP,
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SIP_HDR_VIA_TCP,
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SIP_HDR_EXPIRES,
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SIP_HDR_EXPIRES,
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SIP_HDR_CONTENT_LENGTH,
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SIP_HDR_CONTENT_LENGTH,
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SIP_HDR_CALL_ID,
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};
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};
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enum sdp_header_types {
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enum sdp_header_types {
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@ -130,6 +130,44 @@ static int digits_len(const struct nf_conn *ct, const char *dptr,
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return len;
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return len;
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}
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}
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static int iswordc(const char c)
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{
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if (isalnum(c) || c == '!' || c == '"' || c == '%' ||
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(c >= '(' && c <= '/') || c == ':' || c == '<' || c == '>' ||
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c == '?' || (c >= '[' && c <= ']') || c == '_' || c == '`' ||
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c == '{' || c == '}' || c == '~')
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return 1;
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return 0;
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}
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static int word_len(const char *dptr, const char *limit)
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{
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int len = 0;
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while (dptr < limit && iswordc(*dptr)) {
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dptr++;
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len++;
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}
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return len;
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}
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static int callid_len(const struct nf_conn *ct, const char *dptr,
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const char *limit, int *shift)
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{
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int len, domain_len;
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len = word_len(dptr, limit);
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dptr += len;
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if (!len || dptr == limit || *dptr != '@')
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return len;
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dptr++;
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len++;
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domain_len = word_len(dptr, limit);
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if (!domain_len)
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return 0;
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return len + domain_len;
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}
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/* get media type + port length */
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/* get media type + port length */
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static int media_len(const struct nf_conn *ct, const char *dptr,
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static int media_len(const struct nf_conn *ct, const char *dptr,
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const char *limit, int *shift)
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const char *limit, int *shift)
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@ -299,6 +337,7 @@ static const struct sip_header ct_sip_hdrs[] = {
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[SIP_HDR_VIA_TCP] = SIP_HDR("Via", "v", "TCP ", epaddr_len),
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[SIP_HDR_VIA_TCP] = SIP_HDR("Via", "v", "TCP ", epaddr_len),
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[SIP_HDR_EXPIRES] = SIP_HDR("Expires", NULL, NULL, digits_len),
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[SIP_HDR_EXPIRES] = SIP_HDR("Expires", NULL, NULL, digits_len),
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[SIP_HDR_CONTENT_LENGTH] = SIP_HDR("Content-Length", "l", NULL, digits_len),
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[SIP_HDR_CONTENT_LENGTH] = SIP_HDR("Content-Length", "l", NULL, digits_len),
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[SIP_HDR_CALL_ID] = SIP_HDR("Call-Id", "i", NULL, callid_len),
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};
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};
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static const char *sip_follow_continuation(const char *dptr, const char *limit)
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static const char *sip_follow_continuation(const char *dptr, const char *limit)
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