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authorSimon Horman <horms@verge.net.au>2010-08-22 21:37:51 +0900
committerSimon Horman <horms@verge.net.au>2010-10-04 22:45:23 +0900
commit001985b2c0cfad48e1dec8e30f4d432eac240dd2 (patch)
tree1fe80a8c34751374a785700c22bb9369d5679c55 /net/netfilter
parent5adbb9fb0c35c38022f79e09fecf15ba8f65f069 (diff)
netfilter: nf_conntrack_sip: Add callid parser
Signed-off-by: Simon Horman <horms@verge.net.au> Acked-by: Julian Anastasov <ja@ssi.bg>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nf_conntrack_sip.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 2fd1ea2c1bb3..715ce54d2fc4 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -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)