netfilter 46/62: nf_conntrack_sip: add T.38 FAX support

Patrick McHardy
2010-02-16T14:56:22Z

commit 9d288dffe3a276e1f06ba556845c456d696c5a4f
Author: Patrick McHardy <kaber@trash.net>
Date: Thu Feb 11 12:30:21 2010 +0100

netfilter: nf_conntrack_sip: add T.38 FAX support

Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/include/linux/netfilter/nf_conntrack_sip.h b/include/linux/netfilter/nf_conntrack_sip.h
index cd84d6f..ff8cfbc 100644
--- a/include/linux/netfilter/nf_conntrack_sip.h
+++ b/include/linux/netfilter/nf_conntrack_sip.h
@@ -14,6 +14,7 @@ enum sip_expectation_classes {
SIP_EXPECT_SIGNALLING,
SIP_EXPECT_AUDIO,
SIP_EXPECT_VIDEO,
+ SIP_EXPECT_IMAGE,
__SIP_EXPECT_MAX
};
#define SIP_EXPECT_MAX (__SIP_EXPECT_MAX - 1)
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 5043d61..5b7d883 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -70,7 +70,7 @@ union nf_conntrack_help {
struct nf_conntrack_helper;

/* Must be kept in sync with the classes defined by helpers */
-#define NF_CT_MAX_EXPECT_CLASSES 3
+#define NF_CT_MAX_EXPECT_CLASSES 4

/* nf_conn feature for connections that have a helper */
struct nf_conn_help {
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 3bb3aaf..fbe8ff5 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -907,6 +907,7 @@ err1:
static const struct sdp_media_type sdp_media_types[] = {
SDP_MEDIA_TYPE("audio ", SIP_EXPECT_AUDIO),
SDP_MEDIA_TYPE("video ", SIP_EXPECT_VIDEO),
+ SDP_MEDIA_TYPE("image ", SIP_EXPECT_IMAGE),
};

static const struct sdp_media_type *sdp_media_type(const char *dptr,
@@ -932,7 +933,6 @@ static int process_sdp(struct sk_buff *skb, unsigned int dataoff,
{
enum ip_conntrack_info ctinfo;
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- struct nf_conn_help *help = nfct_help(ct);
unsigned int matchoff, matchlen;
unsigned int mediaoff, medialen;
unsigned int sdpoff;
@@ -1024,9 +1024,6 @@ static int process_sdp(struct sk_buff *skb, unsigned int dataoff,
ret = nf_nat_sdp_session(skb, dataoff, dptr, datalen, sdpoff,
&rtp_addr);

- if (ret == NF_ACCEPT && i > 0)
- help->help.ct_sip_info.invite_cseq = cseq;
-
return ret;
}
static int process_invite_response(struct sk_buff *skb, unsigned int dataoff,
@@ -1077,6 +1074,22 @@ static int process_prack_response(struct sk_buff *skb, unsigned int dataoff,
return NF_ACCEPT;
}

+static int process_invite_request(struct sk_buff *skb, unsigned int dataoff,
+ const char **dptr, unsigned int *datalen,
+ unsigned int cseq)
+{
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+ struct nf_conn_help *help = nfct_help(ct);
+ unsigned int ret;
+
+ flush_expectations(ct, true);
+ ret = process_sdp(skb, dataoff, dptr, datalen, cseq);
+ if (ret == NF_ACCEPT)
+ help->help.ct_sip_info.invite_cseq = cseq;
+ return ret;
+}
+
static int process_bye_request(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq)
@@ -1257,7 +1270,7 @@ flush:
}

static const struct sip_handler sip_handlers[] = {
- SIP_HANDLER("INVITE", process_sdp, process_invite_response),
+ SIP_HANDLER("INVITE", process_invite_request, process_invite_response),
SIP_HANDLER("UPDATE", process_sdp, process_update_response),
SIP_HANDLER("ACK", process_sdp, NULL),
SIP_HANDLER("PRACK", process_sdp, process_prack_response),
@@ -1473,6 +1486,11 @@ static const struct nf_conntrack_expect_policy sip_exp_policy[SIP_EXPECT_MAX + 1
.max_expected = 2 * IP_CT_DIR_MAX,
.timeout = 3 * 60,
},
+ [SIP_EXPECT_IMAGE] = {
+ .name = "image",
+ .max_expected = IP_CT_DIR_MAX,
+ .timeout = 3 * 60,
+ },
};

static void nf_conntrack_sip_fini(void)