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Commit 9d288dff authored by Patrick McHardy's avatar Patrick McHardy
Browse files

netfilter: nf_conntrack_sip: add T.38 FAX support 



Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
parent 48f8ac26

include/linux/netfilter/nf_conntrack_sip.h

+1 −0
Original line number Diff line number Diff line
@@ -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)

include/net/netfilter/nf_conntrack.h

+1 −1
Original line number Diff line number Diff line
@@ -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 {

net/netfilter/nf_conntrack_sip.c

+23 −5
Original line number Diff line number Diff line
@@ -907,6 +907,7 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int dataoff, 
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 @@ static int process_register_response(struct sk_buff *skb, unsigned int dataoff, 
}



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)