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netfilter: nf_conntrack_sip: add T.38 FAX support 

Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy 2010-02-11 12:30:21 +01:00
parent 48f8ac2653
commit 9d288dffe3
3 changed files with 25 additions and 6 deletions
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1
include/linux/netfilter/nf_conntrack_sip.h
View File

@ -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)

2
include/net/netfilter/nf_conntrack.h
View File

@ -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 {

28
net/netfilter/nf_conntrack_sip.c
View File

@ -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)