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netfilter: nf_conntrack_sip: Add callid parser 

Signed-off-by: Simon Horman <horms@verge.net.au>
Acked-by: Julian Anastasov <ja@ssi.bg>
This commit is contained in:
Simon Horman 2010-08-22 21:37:51 +09:00
parent 5adbb9fb0c
commit 001985b2c0
2 changed files with 40 additions and 0 deletions
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1
include/linux/netfilter/nf_conntrack_sip.h
View File

@ -89,6 +89,7 @@ enum sip_header_types {
SIP_HDR_VIA_TCP,
SIP_HDR_EXPIRES,
SIP_HDR_CONTENT_LENGTH,
SIP_HDR_CALL_ID,
};
enum sdp_header_types {

39
net/netfilter/nf_conntrack_sip.c
View File

@ -130,6 +130,44 @@ static int digits_len(const struct nf_conn *ct, const char *dptr,
return len;
}
static int iswordc(const char c)
{
if (isalnum(c) || c == '!' || c == '"' || c == '%' ||
(c >= '(' && c <= '/') || c == ':' || c == '<' || c == '>' ||
c == '?' || (c >= '[' && c <= ']') || c == '_' || c == '`' ||
c == '{' || c == '}' || c == '~')
return 1;
return 0;
}
static int word_len(const char *dptr, const char *limit)
{
int len = 0;
while (dptr < limit && iswordc(*dptr)) {
dptr++;
len++;
}
return len;
}
static int callid_len(const struct nf_conn *ct, const char *dptr,
const char *limit, int *shift)
{
int len, domain_len;
len = word_len(dptr, limit);
dptr += len;
if (!len || dptr == limit || *dptr != '@')
return len;
dptr++;
len++;
domain_len = word_len(dptr, limit);
if (!domain_len)
return 0;
return len + domain_len;
}
/* get media type + port length */
static int media_len(const struct nf_conn *ct, const char *dptr,
const char *limit, int *shift)
@ -299,6 +337,7 @@ static const struct sip_header ct_sip_hdrs[] = {
[SIP_HDR_VIA_TCP] = SIP_HDR("Via", "v", "TCP ", epaddr_len),
[SIP_HDR_EXPIRES] = SIP_HDR("Expires", NULL, NULL, digits_len),
[SIP_HDR_CONTENT_LENGTH] = SIP_HDR("Content-Length", "l", NULL, digits_len),
[SIP_HDR_CALL_ID] = SIP_HDR("Call-Id", "i", NULL, callid_len),
};
static const char *sip_follow_continuation(const char *dptr, const char *limit)