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![xiao ruizhu](/assets/img/avatar_default.png)
When conntracks change during a dialog, SDP messages may be sent from different conntracks to establish expects with identical tuples. In this case expects conflict may be detected for the 2nd SDP message and end up with a process failure. The fixing here is to reuse an existing expect who has the same tuple for a different conntrack if any. Here are two scenarios for the case. 1) SERVER CPE | INVITE SDP | 5060 |<----------------------|5060 | 100 Trying | 5060 |---------------------->|5060 | 183 SDP | 5060 |---------------------->|5060 ===> Conntrack 1 | PRACK | 50601 |<----------------------|5060 | 200 OK (PRACK) | 50601 |---------------------->|5060 | 200 OK (INVITE) | 5060 |---------------------->|5060 | ACK | 50601 |<----------------------|5060 | | |<--- RTP stream ------>| | | | INVITE SDP (t38) | 50601 |---------------------->|5060 ===> Conntrack 2 With a certain configuration in the CPE, SIP messages "183 with SDP" and "re-INVITE with SDP t38" will go through the sip helper to create expects for RTP and RTCP. It is okay to create RTP and RTCP expects for "183", whose master connection source port is 5060, and destination port is 5060. In the "183" message, port in Contact header changes to 50601 (from the original 5060). So the following requests e.g. PRACK and ACK are sent to port 50601. It is a different conntrack (let call Conntrack 2) from the original INVITE (let call Conntrack 1) due to the port difference. In this example, after the call is established, there is RTP stream but no RTCP stream for Conntrack 1, so the RTP expect created upon "183" is cleared, and RTCP expect created for Conntrack 1 retains. When "re-INVITE with SDP t38" arrives to create RTP&RTCP expects, current ALG implementation will call nf_ct_expect_related() for RTP and RTCP. The expects tuples are identical to those for Conntrack 1. RTP expect for Conntrack 2 succeeds in creation as the one for Conntrack 1 has been removed. RTCP expect for Conntrack 2 fails in creation because it has idential tuples and 'conflict' with the one retained for Conntrack 1. And then result in a failure in processing of the re-INVITE. 2) SERVER A CPE | REGISTER | 5060 |<------------------| 5060 ==> CT1 | 200 | 5060 |------------------>| 5060 | | | INVITE SDP(1) | 5060 |<------------------| 5060 | 300(multi choice) | 5060 |------------------>| 5060 SERVER B | ACK | 5060 |<------------------| 5060 | INVITE SDP(2) | 5060 |-------------------->| 5060 ==> CT2 | 100 | 5060 |<--------------------| 5060 | 200(contact changes)| 5060 |<--------------------| 5060 | ACK | 5060 |-------------------->| 50601 ==> CT3 | | |<--- RTP stream ---->| | | | BYE | 5060 |<--------------------| 50601 | 200 | 5060 |-------------------->| 50601 | INVITE SDP(3) | 5060 |<------------------| 5060 ==> CT1 CPE sends an INVITE request(1) to Server A, and creates a RTP&RTCP expect pair for this Conntrack 1 (CT1). Server A responds 300 to redirect to Server B. The RTP&RTCP expect pairs created on CT1 are removed upon 300 response. CPE sends the INVITE request(2) to Server B, and creates an expect pair for the new conntrack (due to destination address difference), let call CT2. Server B changes the port to 50601 in 200 OK response, and the following requests ACK and BYE from CPE are sent to 50601. The call is established. There is RTP stream and no RTCP stream. So RTP expect is removed and RTCP expect for CT2 retains. As BYE request is sent from port 50601, it is another conntrack, let call CT3, different from CT2 due to the port difference. So the BYE request will not remove the RTCP expect for CT2. Then another outgoing call is made, with the same RTP port being used (not definitely but possibly). CPE firstly sends the INVITE request(3) to Server A, and tries to create a RTP&RTCP expect pairs for this CT1. In current ALG implementation, the RTCP expect for CT1 fails in creation because it 'conflicts' with the residual one for CT2. As a result the INVITE request fails to send. Signed-off-by: xiao ruizhu <katrina.xiaorz@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1856 lines
51 KiB
C
1856 lines
51 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* H.323 connection tracking helper
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*
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* Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
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* Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net>
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*
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* Based on the 'brute force' H.323 connection tracking module by
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* Jozsef Kadlecsik <kadlec@netfilter.org>
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*
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* For more information, please see http://nath323.sourceforge.net/
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/ctype.h>
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#include <linux/inet.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/slab.h>
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#include <linux/udp.h>
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#include <linux/tcp.h>
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#include <linux/skbuff.h>
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#include <net/route.h>
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#include <net/ip6_route.h>
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#include <linux/netfilter_ipv6.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_tuple.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#include <net/netfilter/nf_conntrack_ecache.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_zones.h>
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#include <linux/netfilter/nf_conntrack_h323.h>
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/* Parameters */
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static unsigned int default_rrq_ttl __read_mostly = 300;
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module_param(default_rrq_ttl, uint, 0600);
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MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
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static int gkrouted_only __read_mostly = 1;
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module_param(gkrouted_only, int, 0600);
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MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
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static bool callforward_filter __read_mostly = true;
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module_param(callforward_filter, bool, 0600);
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MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
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"if both endpoints are on different sides "
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"(determined by routing information)");
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/* Hooks for NAT */
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int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr,
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union nf_inet_addr *addr, __be16 port)
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__read_mostly;
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int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff,
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unsigned char **data, int dataoff,
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TransportAddress *taddr,
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union nf_inet_addr *addr, __be16 port)
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__read_mostly;
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int (*set_sig_addr_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int protoff, unsigned char **data,
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TransportAddress *taddr, int count) __read_mostly;
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int (*set_ras_addr_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int protoff, unsigned char **data,
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TransportAddress *taddr, int count) __read_mostly;
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int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int protoff,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr,
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__be16 port, __be16 rtp_port,
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struct nf_conntrack_expect *rtp_exp,
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struct nf_conntrack_expect *rtcp_exp) __read_mostly;
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int (*nat_t120_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int protoff,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr, __be16 port,
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struct nf_conntrack_expect *exp) __read_mostly;
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int (*nat_h245_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int protoff,
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unsigned char **data, int dataoff,
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TransportAddress *taddr, __be16 port,
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struct nf_conntrack_expect *exp) __read_mostly;
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int (*nat_callforwarding_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int protoff,
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unsigned char **data, int dataoff,
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TransportAddress *taddr, __be16 port,
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struct nf_conntrack_expect *exp) __read_mostly;
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int (*nat_q931_hook) (struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int protoff,
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unsigned char **data, TransportAddress *taddr, int idx,
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__be16 port, struct nf_conntrack_expect *exp)
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__read_mostly;
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static DEFINE_SPINLOCK(nf_h323_lock);
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static char *h323_buffer;
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static struct nf_conntrack_helper nf_conntrack_helper_h245;
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static struct nf_conntrack_helper nf_conntrack_helper_q931[];
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static struct nf_conntrack_helper nf_conntrack_helper_ras[];
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static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
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struct nf_conn *ct, enum ip_conntrack_info ctinfo,
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unsigned char **data, int *datalen, int *dataoff)
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{
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struct nf_ct_h323_master *info = nfct_help_data(ct);
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int dir = CTINFO2DIR(ctinfo);
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const struct tcphdr *th;
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struct tcphdr _tcph;
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int tcpdatalen;
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int tcpdataoff;
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unsigned char *tpkt;
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int tpktlen;
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int tpktoff;
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/* Get TCP header */
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th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
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if (th == NULL)
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return 0;
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/* Get TCP data offset */
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tcpdataoff = protoff + th->doff * 4;
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/* Get TCP data length */
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tcpdatalen = skb->len - tcpdataoff;
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if (tcpdatalen <= 0) /* No TCP data */
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goto clear_out;
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if (*data == NULL) { /* first TPKT */
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/* Get first TPKT pointer */
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tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
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h323_buffer);
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BUG_ON(tpkt == NULL);
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/* Validate TPKT identifier */
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if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
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/* Netmeeting sends TPKT header and data separately */
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if (info->tpkt_len[dir] > 0) {
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pr_debug("nf_ct_h323: previous packet "
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"indicated separate TPKT data of %hu "
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"bytes\n", info->tpkt_len[dir]);
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if (info->tpkt_len[dir] <= tcpdatalen) {
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/* Yes, there was a TPKT header
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* received */
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*data = tpkt;
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*datalen = info->tpkt_len[dir];
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*dataoff = 0;
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goto out;
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}
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/* Fragmented TPKT */
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pr_debug("nf_ct_h323: fragmented TPKT\n");
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goto clear_out;
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}
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/* It is not even a TPKT */
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return 0;
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}
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tpktoff = 0;
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} else { /* Next TPKT */
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tpktoff = *dataoff + *datalen;
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tcpdatalen -= tpktoff;
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if (tcpdatalen <= 4) /* No more TPKT */
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goto clear_out;
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tpkt = *data + *datalen;
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/* Validate TPKT identifier */
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if (tpkt[0] != 0x03 || tpkt[1] != 0)
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goto clear_out;
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}
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/* Validate TPKT length */
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tpktlen = tpkt[2] * 256 + tpkt[3];
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if (tpktlen < 4)
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goto clear_out;
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if (tpktlen > tcpdatalen) {
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if (tcpdatalen == 4) { /* Separate TPKT header */
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/* Netmeeting sends TPKT header and data separately */
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pr_debug("nf_ct_h323: separate TPKT header indicates "
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"there will be TPKT data of %hu bytes\n",
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tpktlen - 4);
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info->tpkt_len[dir] = tpktlen - 4;
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return 0;
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}
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pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
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goto clear_out;
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}
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/* This is the encapsulated data */
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*data = tpkt + 4;
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*datalen = tpktlen - 4;
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*dataoff = tpktoff + 4;
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out:
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/* Clear TPKT length */
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info->tpkt_len[dir] = 0;
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return 1;
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clear_out:
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info->tpkt_len[dir] = 0;
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return 0;
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}
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static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
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H245_TransportAddress *taddr,
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union nf_inet_addr *addr, __be16 *port)
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{
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const unsigned char *p;
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int len;
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if (taddr->choice != eH245_TransportAddress_unicastAddress)
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return 0;
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switch (taddr->unicastAddress.choice) {
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case eUnicastAddress_iPAddress:
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if (nf_ct_l3num(ct) != AF_INET)
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return 0;
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p = data + taddr->unicastAddress.iPAddress.network;
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len = 4;
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break;
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case eUnicastAddress_iP6Address:
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if (nf_ct_l3num(ct) != AF_INET6)
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return 0;
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p = data + taddr->unicastAddress.iP6Address.network;
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len = 16;
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break;
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default:
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return 0;
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}
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memcpy(addr, p, len);
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memset((void *)addr + len, 0, sizeof(*addr) - len);
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memcpy(port, p + len, sizeof(__be16));
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return 1;
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}
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static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int protoff,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr)
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{
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int dir = CTINFO2DIR(ctinfo);
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int ret = 0;
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__be16 port;
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__be16 rtp_port, rtcp_port;
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union nf_inet_addr addr;
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struct nf_conntrack_expect *rtp_exp;
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struct nf_conntrack_expect *rtcp_exp;
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typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
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/* Read RTP or RTCP address */
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if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
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memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
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port == 0)
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return 0;
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/* RTP port is even */
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rtp_port = port & ~htons(1);
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rtcp_port = port | htons(1);
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/* Create expect for RTP */
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if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
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return -1;
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nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
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&ct->tuplehash[!dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3,
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IPPROTO_UDP, NULL, &rtp_port);
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/* Create expect for RTCP */
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if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
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nf_ct_expect_put(rtp_exp);
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return -1;
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}
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nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
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&ct->tuplehash[!dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3,
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IPPROTO_UDP, NULL, &rtcp_port);
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if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3,
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sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
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(nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
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nf_ct_l3num(ct) == NFPROTO_IPV4 &&
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ct->status & IPS_NAT_MASK) {
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/* NAT needed */
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ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
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taddr, port, rtp_port, rtp_exp, rtcp_exp);
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} else { /* Conntrack only */
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if (nf_ct_expect_related(rtp_exp, 0) == 0) {
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if (nf_ct_expect_related(rtcp_exp, 0) == 0) {
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pr_debug("nf_ct_h323: expect RTP ");
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nf_ct_dump_tuple(&rtp_exp->tuple);
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pr_debug("nf_ct_h323: expect RTCP ");
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nf_ct_dump_tuple(&rtcp_exp->tuple);
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} else {
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nf_ct_unexpect_related(rtp_exp);
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ret = -1;
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}
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} else
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ret = -1;
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}
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nf_ct_expect_put(rtp_exp);
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nf_ct_expect_put(rtcp_exp);
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return ret;
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}
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static int expect_t120(struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int protoff,
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unsigned char **data, int dataoff,
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H245_TransportAddress *taddr)
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{
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int dir = CTINFO2DIR(ctinfo);
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int ret = 0;
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__be16 port;
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union nf_inet_addr addr;
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struct nf_conntrack_expect *exp;
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typeof(nat_t120_hook) nat_t120;
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/* Read T.120 address */
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if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
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memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
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port == 0)
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return 0;
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/* Create expect for T.120 connections */
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if ((exp = nf_ct_expect_alloc(ct)) == NULL)
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return -1;
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nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
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&ct->tuplehash[!dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3,
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IPPROTO_TCP, NULL, &port);
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exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */
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if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3,
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sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
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(nat_t120 = rcu_dereference(nat_t120_hook)) &&
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nf_ct_l3num(ct) == NFPROTO_IPV4 &&
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ct->status & IPS_NAT_MASK) {
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/* NAT needed */
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ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr,
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port, exp);
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} else { /* Conntrack only */
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if (nf_ct_expect_related(exp, 0) == 0) {
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pr_debug("nf_ct_h323: expect T.120 ");
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nf_ct_dump_tuple(&exp->tuple);
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} else
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ret = -1;
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}
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nf_ct_expect_put(exp);
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return ret;
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}
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static int process_h245_channel(struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int protoff,
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unsigned char **data, int dataoff,
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H2250LogicalChannelParameters *channel)
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{
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int ret;
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if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
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/* RTP */
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ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
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&channel->mediaChannel);
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if (ret < 0)
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return -1;
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}
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|
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if (channel->
|
|
options & eH2250LogicalChannelParameters_mediaControlChannel) {
|
|
/* RTCP */
|
|
ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&channel->mediaControlChannel);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, int dataoff,
|
|
OpenLogicalChannel *olc)
|
|
{
|
|
int ret;
|
|
|
|
pr_debug("nf_ct_h323: OpenLogicalChannel\n");
|
|
|
|
if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
|
|
eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
|
|
{
|
|
ret = process_h245_channel(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&olc->
|
|
forwardLogicalChannelParameters.
|
|
multiplexParameters.
|
|
h2250LogicalChannelParameters);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((olc->options &
|
|
eOpenLogicalChannel_reverseLogicalChannelParameters) &&
|
|
(olc->reverseLogicalChannelParameters.options &
|
|
eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
|
|
&& (olc->reverseLogicalChannelParameters.multiplexParameters.
|
|
choice ==
|
|
eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
|
|
{
|
|
ret =
|
|
process_h245_channel(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&olc->
|
|
reverseLogicalChannelParameters.
|
|
multiplexParameters.
|
|
h2250LogicalChannelParameters);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((olc->options & eOpenLogicalChannel_separateStack) &&
|
|
olc->forwardLogicalChannelParameters.dataType.choice ==
|
|
eDataType_data &&
|
|
olc->forwardLogicalChannelParameters.dataType.data.application.
|
|
choice == eDataApplicationCapability_application_t120 &&
|
|
olc->forwardLogicalChannelParameters.dataType.data.application.
|
|
t120.choice == eDataProtocolCapability_separateLANStack &&
|
|
olc->separateStack.networkAddress.choice ==
|
|
eNetworkAccessParameters_networkAddress_localAreaAddress) {
|
|
ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&olc->separateStack.networkAddress.
|
|
localAreaAddress);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff, unsigned char **data, int dataoff,
|
|
OpenLogicalChannelAck *olca)
|
|
{
|
|
H2250LogicalChannelAckParameters *ack;
|
|
int ret;
|
|
|
|
pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
|
|
|
|
if ((olca->options &
|
|
eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
|
|
(olca->reverseLogicalChannelParameters.options &
|
|
eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
|
|
&& (olca->reverseLogicalChannelParameters.multiplexParameters.
|
|
choice ==
|
|
eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
|
|
{
|
|
ret = process_h245_channel(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&olca->
|
|
reverseLogicalChannelParameters.
|
|
multiplexParameters.
|
|
h2250LogicalChannelParameters);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((olca->options &
|
|
eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
|
|
(olca->forwardMultiplexAckParameters.choice ==
|
|
eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
|
|
{
|
|
ack = &olca->forwardMultiplexAckParameters.
|
|
h2250LogicalChannelAckParameters;
|
|
if (ack->options &
|
|
eH2250LogicalChannelAckParameters_mediaChannel) {
|
|
/* RTP */
|
|
ret = expect_rtp_rtcp(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&ack->mediaChannel);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (ack->options &
|
|
eH2250LogicalChannelAckParameters_mediaControlChannel) {
|
|
/* RTCP */
|
|
ret = expect_rtp_rtcp(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&ack->mediaControlChannel);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
|
|
olca->separateStack.networkAddress.choice ==
|
|
eNetworkAccessParameters_networkAddress_localAreaAddress) {
|
|
ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&olca->separateStack.networkAddress.
|
|
localAreaAddress);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff, unsigned char **data, int dataoff,
|
|
MultimediaSystemControlMessage *mscm)
|
|
{
|
|
switch (mscm->choice) {
|
|
case eMultimediaSystemControlMessage_request:
|
|
if (mscm->request.choice ==
|
|
eRequestMessage_openLogicalChannel) {
|
|
return process_olc(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&mscm->request.openLogicalChannel);
|
|
}
|
|
pr_debug("nf_ct_h323: H.245 Request %d\n",
|
|
mscm->request.choice);
|
|
break;
|
|
case eMultimediaSystemControlMessage_response:
|
|
if (mscm->response.choice ==
|
|
eResponseMessage_openLogicalChannelAck) {
|
|
return process_olca(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&mscm->response.
|
|
openLogicalChannelAck);
|
|
}
|
|
pr_debug("nf_ct_h323: H.245 Response %d\n",
|
|
mscm->response.choice);
|
|
break;
|
|
default:
|
|
pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int h245_help(struct sk_buff *skb, unsigned int protoff,
|
|
struct nf_conn *ct, enum ip_conntrack_info ctinfo)
|
|
{
|
|
static MultimediaSystemControlMessage mscm;
|
|
unsigned char *data = NULL;
|
|
int datalen;
|
|
int dataoff;
|
|
int ret;
|
|
|
|
/* Until there's been traffic both ways, don't look in packets. */
|
|
if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
|
|
return NF_ACCEPT;
|
|
|
|
pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
|
|
|
|
spin_lock_bh(&nf_h323_lock);
|
|
|
|
/* Process each TPKT */
|
|
while (get_tpkt_data(skb, protoff, ct, ctinfo,
|
|
&data, &datalen, &dataoff)) {
|
|
pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
|
|
nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
|
|
|
|
/* Decode H.245 signal */
|
|
ret = DecodeMultimediaSystemControlMessage(data, datalen,
|
|
&mscm);
|
|
if (ret < 0) {
|
|
pr_debug("nf_ct_h245: decoding error: %s\n",
|
|
ret == H323_ERROR_BOUND ?
|
|
"out of bound" : "out of range");
|
|
/* We don't drop when decoding error */
|
|
break;
|
|
}
|
|
|
|
/* Process H.245 signal */
|
|
if (process_h245(skb, ct, ctinfo, protoff,
|
|
&data, dataoff, &mscm) < 0)
|
|
goto drop;
|
|
}
|
|
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
return NF_ACCEPT;
|
|
|
|
drop:
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
nf_ct_helper_log(skb, ct, "cannot process H.245 message");
|
|
return NF_DROP;
|
|
}
|
|
|
|
static const struct nf_conntrack_expect_policy h245_exp_policy = {
|
|
.max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
|
|
.timeout = 240,
|
|
};
|
|
|
|
static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
|
|
.name = "H.245",
|
|
.me = THIS_MODULE,
|
|
.tuple.src.l3num = AF_UNSPEC,
|
|
.tuple.dst.protonum = IPPROTO_UDP,
|
|
.help = h245_help,
|
|
.expect_policy = &h245_exp_policy,
|
|
};
|
|
|
|
int get_h225_addr(struct nf_conn *ct, unsigned char *data,
|
|
TransportAddress *taddr,
|
|
union nf_inet_addr *addr, __be16 *port)
|
|
{
|
|
const unsigned char *p;
|
|
int len;
|
|
|
|
switch (taddr->choice) {
|
|
case eTransportAddress_ipAddress:
|
|
if (nf_ct_l3num(ct) != AF_INET)
|
|
return 0;
|
|
p = data + taddr->ipAddress.ip;
|
|
len = 4;
|
|
break;
|
|
case eTransportAddress_ip6Address:
|
|
if (nf_ct_l3num(ct) != AF_INET6)
|
|
return 0;
|
|
p = data + taddr->ip6Address.ip;
|
|
len = 16;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
memcpy(addr, p, len);
|
|
memset((void *)addr + len, 0, sizeof(*addr) - len);
|
|
memcpy(port, p + len, sizeof(__be16));
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff, unsigned char **data, int dataoff,
|
|
TransportAddress *taddr)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
typeof(nat_h245_hook) nat_h245;
|
|
|
|
/* Read h245Address */
|
|
if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
|
|
memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
|
|
port == 0)
|
|
return 0;
|
|
|
|
/* Create expect for h245 connection */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
&ct->tuplehash[!dir].tuple.src.u3,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
IPPROTO_TCP, NULL, &port);
|
|
exp->helper = &nf_conntrack_helper_h245;
|
|
|
|
if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
|
|
(nat_h245 = rcu_dereference(nat_h245_hook)) &&
|
|
nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK) {
|
|
/* NAT needed */
|
|
ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr,
|
|
port, exp);
|
|
} else { /* Conntrack only */
|
|
if (nf_ct_expect_related(exp, 0) == 0) {
|
|
pr_debug("nf_ct_q931: expect H.245 ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
} else
|
|
ret = -1;
|
|
}
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* If the calling party is on the same side of the forward-to party,
|
|
* we don't need to track the second call
|
|
*/
|
|
static int callforward_do_filter(struct net *net,
|
|
const union nf_inet_addr *src,
|
|
const union nf_inet_addr *dst,
|
|
u_int8_t family)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (family) {
|
|
case AF_INET: {
|
|
struct flowi4 fl1, fl2;
|
|
struct rtable *rt1, *rt2;
|
|
|
|
memset(&fl1, 0, sizeof(fl1));
|
|
fl1.daddr = src->ip;
|
|
|
|
memset(&fl2, 0, sizeof(fl2));
|
|
fl2.daddr = dst->ip;
|
|
if (!nf_ip_route(net, (struct dst_entry **)&rt1,
|
|
flowi4_to_flowi(&fl1), false)) {
|
|
if (!nf_ip_route(net, (struct dst_entry **)&rt2,
|
|
flowi4_to_flowi(&fl2), false)) {
|
|
if (rt_nexthop(rt1, fl1.daddr) ==
|
|
rt_nexthop(rt2, fl2.daddr) &&
|
|
rt1->dst.dev == rt2->dst.dev)
|
|
ret = 1;
|
|
dst_release(&rt2->dst);
|
|
}
|
|
dst_release(&rt1->dst);
|
|
}
|
|
break;
|
|
}
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6: {
|
|
struct rt6_info *rt1, *rt2;
|
|
struct flowi6 fl1, fl2;
|
|
|
|
memset(&fl1, 0, sizeof(fl1));
|
|
fl1.daddr = src->in6;
|
|
|
|
memset(&fl2, 0, sizeof(fl2));
|
|
fl2.daddr = dst->in6;
|
|
if (!nf_ip6_route(net, (struct dst_entry **)&rt1,
|
|
flowi6_to_flowi(&fl1), false)) {
|
|
if (!nf_ip6_route(net, (struct dst_entry **)&rt2,
|
|
flowi6_to_flowi(&fl2), false)) {
|
|
if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr),
|
|
rt6_nexthop(rt2, &fl2.daddr)) &&
|
|
rt1->dst.dev == rt2->dst.dev)
|
|
ret = 1;
|
|
dst_release(&rt2->dst);
|
|
}
|
|
dst_release(&rt1->dst);
|
|
}
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
return ret;
|
|
|
|
}
|
|
|
|
static int expect_callforwarding(struct sk_buff *skb,
|
|
struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, int dataoff,
|
|
TransportAddress *taddr)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
struct net *net = nf_ct_net(ct);
|
|
typeof(nat_callforwarding_hook) nat_callforwarding;
|
|
|
|
/* Read alternativeAddress */
|
|
if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
|
|
return 0;
|
|
|
|
/* If the calling party is on the same side of the forward-to party,
|
|
* we don't need to track the second call
|
|
*/
|
|
if (callforward_filter &&
|
|
callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3,
|
|
nf_ct_l3num(ct))) {
|
|
pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Create expect for the second call leg */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
&ct->tuplehash[!dir].tuple.src.u3, &addr,
|
|
IPPROTO_TCP, NULL, &port);
|
|
exp->helper = nf_conntrack_helper_q931;
|
|
|
|
if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
|
|
(nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
|
|
nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK) {
|
|
/* Need NAT */
|
|
ret = nat_callforwarding(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
taddr, port, exp);
|
|
} else { /* Conntrack only */
|
|
if (nf_ct_expect_related(exp, 0) == 0) {
|
|
pr_debug("nf_ct_q931: expect Call Forwarding ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
} else
|
|
ret = -1;
|
|
}
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, int dataoff,
|
|
Setup_UUIE *setup)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret;
|
|
int i;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
typeof(set_h225_addr_hook) set_h225_addr;
|
|
|
|
pr_debug("nf_ct_q931: Setup\n");
|
|
|
|
if (setup->options & eSetup_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&setup->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
set_h225_addr = rcu_dereference(set_h225_addr_hook);
|
|
if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
|
|
(set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK &&
|
|
get_h225_addr(ct, *data, &setup->destCallSignalAddress,
|
|
&addr, &port) &&
|
|
memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
|
|
pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
|
|
&addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
|
|
ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
|
|
ret = set_h225_addr(skb, protoff, data, dataoff,
|
|
&setup->destCallSignalAddress,
|
|
&ct->tuplehash[!dir].tuple.src.u3,
|
|
ct->tuplehash[!dir].tuple.src.u.tcp.port);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
|
|
(set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK &&
|
|
get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
|
|
&addr, &port) &&
|
|
memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
|
|
pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
|
|
&addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
|
|
ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
|
|
ret = set_h225_addr(skb, protoff, data, dataoff,
|
|
&setup->sourceCallSignalAddress,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
ct->tuplehash[!dir].tuple.dst.u.tcp.port);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (setup->options & eSetup_UUIE_fastStart) {
|
|
for (i = 0; i < setup->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&setup->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_callproceeding(struct sk_buff *skb,
|
|
struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, int dataoff,
|
|
CallProceeding_UUIE *callproc)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
pr_debug("nf_ct_q931: CallProceeding\n");
|
|
|
|
if (callproc->options & eCallProceeding_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&callproc->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (callproc->options & eCallProceeding_UUIE_fastStart) {
|
|
for (i = 0; i < callproc->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&callproc->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, int dataoff,
|
|
Connect_UUIE *connect)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
pr_debug("nf_ct_q931: Connect\n");
|
|
|
|
if (connect->options & eConnect_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&connect->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (connect->options & eConnect_UUIE_fastStart) {
|
|
for (i = 0; i < connect->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&connect->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, int dataoff,
|
|
Alerting_UUIE *alert)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
pr_debug("nf_ct_q931: Alerting\n");
|
|
|
|
if (alert->options & eAlerting_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&alert->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (alert->options & eAlerting_UUIE_fastStart) {
|
|
for (i = 0; i < alert->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&alert->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, int dataoff,
|
|
Facility_UUIE *facility)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
pr_debug("nf_ct_q931: Facility\n");
|
|
|
|
if (facility->reason.choice == eFacilityReason_callForwarded) {
|
|
if (facility->options & eFacility_UUIE_alternativeAddress)
|
|
return expect_callforwarding(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&facility->
|
|
alternativeAddress);
|
|
return 0;
|
|
}
|
|
|
|
if (facility->options & eFacility_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&facility->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (facility->options & eFacility_UUIE_fastStart) {
|
|
for (i = 0; i < facility->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&facility->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, int dataoff,
|
|
Progress_UUIE *progress)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
pr_debug("nf_ct_q931: Progress\n");
|
|
|
|
if (progress->options & eProgress_UUIE_h245Address) {
|
|
ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&progress->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (progress->options & eProgress_UUIE_fastStart) {
|
|
for (i = 0; i < progress->fastStart.count; i++) {
|
|
ret = process_olc(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&progress->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff, unsigned char **data, int dataoff,
|
|
Q931 *q931)
|
|
{
|
|
H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
|
|
int i;
|
|
int ret = 0;
|
|
|
|
switch (pdu->h323_message_body.choice) {
|
|
case eH323_UU_PDU_h323_message_body_setup:
|
|
ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&pdu->h323_message_body.setup);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_callProceeding:
|
|
ret = process_callproceeding(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&pdu->h323_message_body.
|
|
callProceeding);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_connect:
|
|
ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&pdu->h323_message_body.connect);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_alerting:
|
|
ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&pdu->h323_message_body.alerting);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_facility:
|
|
ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&pdu->h323_message_body.facility);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_progress:
|
|
ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff,
|
|
&pdu->h323_message_body.progress);
|
|
break;
|
|
default:
|
|
pr_debug("nf_ct_q931: Q.931 signal %d\n",
|
|
pdu->h323_message_body.choice);
|
|
break;
|
|
}
|
|
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
if (pdu->options & eH323_UU_PDU_h245Control) {
|
|
for (i = 0; i < pdu->h245Control.count; i++) {
|
|
ret = process_h245(skb, ct, ctinfo,
|
|
protoff, data, dataoff,
|
|
&pdu->h245Control.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int q931_help(struct sk_buff *skb, unsigned int protoff,
|
|
struct nf_conn *ct, enum ip_conntrack_info ctinfo)
|
|
{
|
|
static Q931 q931;
|
|
unsigned char *data = NULL;
|
|
int datalen;
|
|
int dataoff;
|
|
int ret;
|
|
|
|
/* Until there's been traffic both ways, don't look in packets. */
|
|
if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
|
|
return NF_ACCEPT;
|
|
|
|
pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
|
|
|
|
spin_lock_bh(&nf_h323_lock);
|
|
|
|
/* Process each TPKT */
|
|
while (get_tpkt_data(skb, protoff, ct, ctinfo,
|
|
&data, &datalen, &dataoff)) {
|
|
pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
|
|
nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
|
|
|
|
/* Decode Q.931 signal */
|
|
ret = DecodeQ931(data, datalen, &q931);
|
|
if (ret < 0) {
|
|
pr_debug("nf_ct_q931: decoding error: %s\n",
|
|
ret == H323_ERROR_BOUND ?
|
|
"out of bound" : "out of range");
|
|
/* We don't drop when decoding error */
|
|
break;
|
|
}
|
|
|
|
/* Process Q.931 signal */
|
|
if (process_q931(skb, ct, ctinfo, protoff,
|
|
&data, dataoff, &q931) < 0)
|
|
goto drop;
|
|
}
|
|
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
return NF_ACCEPT;
|
|
|
|
drop:
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
nf_ct_helper_log(skb, ct, "cannot process Q.931 message");
|
|
return NF_DROP;
|
|
}
|
|
|
|
static const struct nf_conntrack_expect_policy q931_exp_policy = {
|
|
/* T.120 and H.245 */
|
|
.max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
|
|
.timeout = 240,
|
|
};
|
|
|
|
static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
|
|
{
|
|
.name = "Q.931",
|
|
.me = THIS_MODULE,
|
|
.tuple.src.l3num = AF_INET,
|
|
.tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
|
|
.tuple.dst.protonum = IPPROTO_TCP,
|
|
.help = q931_help,
|
|
.expect_policy = &q931_exp_policy,
|
|
},
|
|
{
|
|
.name = "Q.931",
|
|
.me = THIS_MODULE,
|
|
.tuple.src.l3num = AF_INET6,
|
|
.tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
|
|
.tuple.dst.protonum = IPPROTO_TCP,
|
|
.help = q931_help,
|
|
.expect_policy = &q931_exp_policy,
|
|
},
|
|
};
|
|
|
|
static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
|
|
int *datalen)
|
|
{
|
|
const struct udphdr *uh;
|
|
struct udphdr _uh;
|
|
int dataoff;
|
|
|
|
uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
|
|
if (uh == NULL)
|
|
return NULL;
|
|
dataoff = protoff + sizeof(_uh);
|
|
if (dataoff >= skb->len)
|
|
return NULL;
|
|
*datalen = skb->len - dataoff;
|
|
return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
|
|
}
|
|
|
|
static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
|
|
union nf_inet_addr *addr,
|
|
__be16 port)
|
|
{
|
|
struct net *net = nf_ct_net(ct);
|
|
struct nf_conntrack_expect *exp;
|
|
struct nf_conntrack_tuple tuple;
|
|
|
|
memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
|
|
tuple.src.u.tcp.port = 0;
|
|
memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
|
|
tuple.dst.u.tcp.port = port;
|
|
tuple.dst.protonum = IPPROTO_TCP;
|
|
|
|
exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
|
|
if (exp && exp->master == ct)
|
|
return exp;
|
|
return NULL;
|
|
}
|
|
|
|
static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff, unsigned char **data,
|
|
TransportAddress *taddr, int count)
|
|
{
|
|
struct nf_ct_h323_master *info = nfct_help_data(ct);
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
int i;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
typeof(nat_q931_hook) nat_q931;
|
|
|
|
/* Look for the first related address */
|
|
for (i = 0; i < count; i++) {
|
|
if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
|
|
memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
|
|
sizeof(addr)) == 0 && port != 0)
|
|
break;
|
|
}
|
|
|
|
if (i >= count) /* Not found */
|
|
return 0;
|
|
|
|
/* Create expect for Q.931 */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
gkrouted_only ? /* only accept calls from GK? */
|
|
&ct->tuplehash[!dir].tuple.src.u3 : NULL,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
IPPROTO_TCP, NULL, &port);
|
|
exp->helper = nf_conntrack_helper_q931;
|
|
exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
|
|
|
|
nat_q931 = rcu_dereference(nat_q931_hook);
|
|
if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK) { /* Need NAT */
|
|
ret = nat_q931(skb, ct, ctinfo, protoff, data,
|
|
taddr, i, port, exp);
|
|
} else { /* Conntrack only */
|
|
if (nf_ct_expect_related(exp, 0) == 0) {
|
|
pr_debug("nf_ct_ras: expect Q.931 ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
|
|
/* Save port for looking up expect in processing RCF */
|
|
info->sig_port[dir] = port;
|
|
} else
|
|
ret = -1;
|
|
}
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, GatekeeperRequest *grq)
|
|
{
|
|
typeof(set_ras_addr_hook) set_ras_addr;
|
|
|
|
pr_debug("nf_ct_ras: GRQ\n");
|
|
|
|
set_ras_addr = rcu_dereference(set_ras_addr_hook);
|
|
if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK) /* NATed */
|
|
return set_ras_addr(skb, ct, ctinfo, protoff, data,
|
|
&grq->rasAddress, 1);
|
|
return 0;
|
|
}
|
|
|
|
static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, GatekeeperConfirm *gcf)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
|
|
pr_debug("nf_ct_ras: GCF\n");
|
|
|
|
if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
|
|
return 0;
|
|
|
|
/* Registration port is the same as discovery port */
|
|
if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
|
|
port == ct->tuplehash[dir].tuple.src.u.udp.port)
|
|
return 0;
|
|
|
|
/* Avoid RAS expectation loops. A GCF is never expected. */
|
|
if (test_bit(IPS_EXPECTED_BIT, &ct->status))
|
|
return 0;
|
|
|
|
/* Need new expect */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
&ct->tuplehash[!dir].tuple.src.u3, &addr,
|
|
IPPROTO_UDP, NULL, &port);
|
|
exp->helper = nf_conntrack_helper_ras;
|
|
|
|
if (nf_ct_expect_related(exp, 0) == 0) {
|
|
pr_debug("nf_ct_ras: expect RAS ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
} else
|
|
ret = -1;
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, RegistrationRequest *rrq)
|
|
{
|
|
struct nf_ct_h323_master *info = nfct_help_data(ct);
|
|
int ret;
|
|
typeof(set_ras_addr_hook) set_ras_addr;
|
|
|
|
pr_debug("nf_ct_ras: RRQ\n");
|
|
|
|
ret = expect_q931(skb, ct, ctinfo, protoff, data,
|
|
rrq->callSignalAddress.item,
|
|
rrq->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
set_ras_addr = rcu_dereference(set_ras_addr_hook);
|
|
if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK) {
|
|
ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
|
|
rrq->rasAddress.item,
|
|
rrq->rasAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (rrq->options & eRegistrationRequest_timeToLive) {
|
|
pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
|
|
info->timeout = rrq->timeToLive;
|
|
} else
|
|
info->timeout = default_rrq_ttl;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, RegistrationConfirm *rcf)
|
|
{
|
|
struct nf_ct_h323_master *info = nfct_help_data(ct);
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret;
|
|
struct nf_conntrack_expect *exp;
|
|
typeof(set_sig_addr_hook) set_sig_addr;
|
|
|
|
pr_debug("nf_ct_ras: RCF\n");
|
|
|
|
set_sig_addr = rcu_dereference(set_sig_addr_hook);
|
|
if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK) {
|
|
ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
|
|
rcf->callSignalAddress.item,
|
|
rcf->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (rcf->options & eRegistrationConfirm_timeToLive) {
|
|
pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
|
|
info->timeout = rcf->timeToLive;
|
|
}
|
|
|
|
if (info->timeout > 0) {
|
|
pr_debug("nf_ct_ras: set RAS connection timeout to "
|
|
"%u seconds\n", info->timeout);
|
|
nf_ct_refresh(ct, skb, info->timeout * HZ);
|
|
|
|
/* Set expect timeout */
|
|
spin_lock_bh(&nf_conntrack_expect_lock);
|
|
exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
|
|
info->sig_port[!dir]);
|
|
if (exp) {
|
|
pr_debug("nf_ct_ras: set Q.931 expect "
|
|
"timeout to %u seconds for",
|
|
info->timeout);
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
mod_timer_pending(&exp->timeout,
|
|
jiffies + info->timeout * HZ);
|
|
}
|
|
spin_unlock_bh(&nf_conntrack_expect_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, UnregistrationRequest *urq)
|
|
{
|
|
struct nf_ct_h323_master *info = nfct_help_data(ct);
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret;
|
|
typeof(set_sig_addr_hook) set_sig_addr;
|
|
|
|
pr_debug("nf_ct_ras: URQ\n");
|
|
|
|
set_sig_addr = rcu_dereference(set_sig_addr_hook);
|
|
if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK) {
|
|
ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
|
|
urq->callSignalAddress.item,
|
|
urq->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
/* Clear old expect */
|
|
nf_ct_remove_expectations(ct);
|
|
info->sig_port[dir] = 0;
|
|
info->sig_port[!dir] = 0;
|
|
|
|
/* Give it 30 seconds for UCF or URJ */
|
|
nf_ct_refresh(ct, skb, 30 * HZ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, AdmissionRequest *arq)
|
|
{
|
|
const struct nf_ct_h323_master *info = nfct_help_data(ct);
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
typeof(set_h225_addr_hook) set_h225_addr;
|
|
|
|
pr_debug("nf_ct_ras: ARQ\n");
|
|
|
|
set_h225_addr = rcu_dereference(set_h225_addr_hook);
|
|
if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
|
|
get_h225_addr(ct, *data, &arq->destCallSignalAddress,
|
|
&addr, &port) &&
|
|
!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
|
|
port == info->sig_port[dir] &&
|
|
nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
set_h225_addr && ct->status & IPS_NAT_MASK) {
|
|
/* Answering ARQ */
|
|
return set_h225_addr(skb, protoff, data, 0,
|
|
&arq->destCallSignalAddress,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
info->sig_port[!dir]);
|
|
}
|
|
|
|
if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
|
|
get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
|
|
&addr, &port) &&
|
|
!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
|
|
set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK) {
|
|
/* Calling ARQ */
|
|
return set_h225_addr(skb, protoff, data, 0,
|
|
&arq->srcCallSignalAddress,
|
|
&ct->tuplehash[!dir].tuple.dst.u3,
|
|
port);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, AdmissionConfirm *acf)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
typeof(set_sig_addr_hook) set_sig_addr;
|
|
|
|
pr_debug("nf_ct_ras: ACF\n");
|
|
|
|
if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
|
|
&addr, &port))
|
|
return 0;
|
|
|
|
if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
|
|
/* Answering ACF */
|
|
set_sig_addr = rcu_dereference(set_sig_addr_hook);
|
|
if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK)
|
|
return set_sig_addr(skb, ct, ctinfo, protoff, data,
|
|
&acf->destCallSignalAddress, 1);
|
|
return 0;
|
|
}
|
|
|
|
/* Need new expect */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
&ct->tuplehash[!dir].tuple.src.u3, &addr,
|
|
IPPROTO_TCP, NULL, &port);
|
|
exp->flags = NF_CT_EXPECT_PERMANENT;
|
|
exp->helper = nf_conntrack_helper_q931;
|
|
|
|
if (nf_ct_expect_related(exp, 0) == 0) {
|
|
pr_debug("nf_ct_ras: expect Q.931 ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
} else
|
|
ret = -1;
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, LocationRequest *lrq)
|
|
{
|
|
typeof(set_ras_addr_hook) set_ras_addr;
|
|
|
|
pr_debug("nf_ct_ras: LRQ\n");
|
|
|
|
set_ras_addr = rcu_dereference(set_ras_addr_hook);
|
|
if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK)
|
|
return set_ras_addr(skb, ct, ctinfo, protoff, data,
|
|
&lrq->replyAddress, 1);
|
|
return 0;
|
|
}
|
|
|
|
static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, LocationConfirm *lcf)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
__be16 port;
|
|
union nf_inet_addr addr;
|
|
struct nf_conntrack_expect *exp;
|
|
|
|
pr_debug("nf_ct_ras: LCF\n");
|
|
|
|
if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
|
|
&addr, &port))
|
|
return 0;
|
|
|
|
/* Need new expect for call signal */
|
|
if ((exp = nf_ct_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
|
|
&ct->tuplehash[!dir].tuple.src.u3, &addr,
|
|
IPPROTO_TCP, NULL, &port);
|
|
exp->flags = NF_CT_EXPECT_PERMANENT;
|
|
exp->helper = nf_conntrack_helper_q931;
|
|
|
|
if (nf_ct_expect_related(exp, 0) == 0) {
|
|
pr_debug("nf_ct_ras: expect Q.931 ");
|
|
nf_ct_dump_tuple(&exp->tuple);
|
|
} else
|
|
ret = -1;
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
/* Ignore rasAddress */
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, InfoRequestResponse *irr)
|
|
{
|
|
int ret;
|
|
typeof(set_ras_addr_hook) set_ras_addr;
|
|
typeof(set_sig_addr_hook) set_sig_addr;
|
|
|
|
pr_debug("nf_ct_ras: IRR\n");
|
|
|
|
set_ras_addr = rcu_dereference(set_ras_addr_hook);
|
|
if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK) {
|
|
ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
|
|
&irr->rasAddress, 1);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
set_sig_addr = rcu_dereference(set_sig_addr_hook);
|
|
if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
|
|
ct->status & IPS_NAT_MASK) {
|
|
ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
|
|
irr->callSignalAddress.item,
|
|
irr->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned int protoff,
|
|
unsigned char **data, RasMessage *ras)
|
|
{
|
|
switch (ras->choice) {
|
|
case eRasMessage_gatekeeperRequest:
|
|
return process_grq(skb, ct, ctinfo, protoff, data,
|
|
&ras->gatekeeperRequest);
|
|
case eRasMessage_gatekeeperConfirm:
|
|
return process_gcf(skb, ct, ctinfo, protoff, data,
|
|
&ras->gatekeeperConfirm);
|
|
case eRasMessage_registrationRequest:
|
|
return process_rrq(skb, ct, ctinfo, protoff, data,
|
|
&ras->registrationRequest);
|
|
case eRasMessage_registrationConfirm:
|
|
return process_rcf(skb, ct, ctinfo, protoff, data,
|
|
&ras->registrationConfirm);
|
|
case eRasMessage_unregistrationRequest:
|
|
return process_urq(skb, ct, ctinfo, protoff, data,
|
|
&ras->unregistrationRequest);
|
|
case eRasMessage_admissionRequest:
|
|
return process_arq(skb, ct, ctinfo, protoff, data,
|
|
&ras->admissionRequest);
|
|
case eRasMessage_admissionConfirm:
|
|
return process_acf(skb, ct, ctinfo, protoff, data,
|
|
&ras->admissionConfirm);
|
|
case eRasMessage_locationRequest:
|
|
return process_lrq(skb, ct, ctinfo, protoff, data,
|
|
&ras->locationRequest);
|
|
case eRasMessage_locationConfirm:
|
|
return process_lcf(skb, ct, ctinfo, protoff, data,
|
|
&ras->locationConfirm);
|
|
case eRasMessage_infoRequestResponse:
|
|
return process_irr(skb, ct, ctinfo, protoff, data,
|
|
&ras->infoRequestResponse);
|
|
default:
|
|
pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ras_help(struct sk_buff *skb, unsigned int protoff,
|
|
struct nf_conn *ct, enum ip_conntrack_info ctinfo)
|
|
{
|
|
static RasMessage ras;
|
|
unsigned char *data;
|
|
int datalen = 0;
|
|
int ret;
|
|
|
|
pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
|
|
|
|
spin_lock_bh(&nf_h323_lock);
|
|
|
|
/* Get UDP data */
|
|
data = get_udp_data(skb, protoff, &datalen);
|
|
if (data == NULL)
|
|
goto accept;
|
|
pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
|
|
nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
|
|
|
|
/* Decode RAS message */
|
|
ret = DecodeRasMessage(data, datalen, &ras);
|
|
if (ret < 0) {
|
|
pr_debug("nf_ct_ras: decoding error: %s\n",
|
|
ret == H323_ERROR_BOUND ?
|
|
"out of bound" : "out of range");
|
|
goto accept;
|
|
}
|
|
|
|
/* Process RAS message */
|
|
if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0)
|
|
goto drop;
|
|
|
|
accept:
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
return NF_ACCEPT;
|
|
|
|
drop:
|
|
spin_unlock_bh(&nf_h323_lock);
|
|
nf_ct_helper_log(skb, ct, "cannot process RAS message");
|
|
return NF_DROP;
|
|
}
|
|
|
|
static const struct nf_conntrack_expect_policy ras_exp_policy = {
|
|
.max_expected = 32,
|
|
.timeout = 240,
|
|
};
|
|
|
|
static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
|
|
{
|
|
.name = "RAS",
|
|
.me = THIS_MODULE,
|
|
.tuple.src.l3num = AF_INET,
|
|
.tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
|
|
.tuple.dst.protonum = IPPROTO_UDP,
|
|
.help = ras_help,
|
|
.expect_policy = &ras_exp_policy,
|
|
},
|
|
{
|
|
.name = "RAS",
|
|
.me = THIS_MODULE,
|
|
.tuple.src.l3num = AF_INET6,
|
|
.tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
|
|
.tuple.dst.protonum = IPPROTO_UDP,
|
|
.help = ras_help,
|
|
.expect_policy = &ras_exp_policy,
|
|
},
|
|
};
|
|
|
|
static int __init h323_helper_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = nf_conntrack_helpers_register(nf_conntrack_helper_q931,
|
|
ARRAY_SIZE(nf_conntrack_helper_q931));
|
|
if (ret < 0)
|
|
goto err1;
|
|
ret = nf_conntrack_helpers_register(nf_conntrack_helper_ras,
|
|
ARRAY_SIZE(nf_conntrack_helper_ras));
|
|
if (ret < 0)
|
|
goto err2;
|
|
|
|
return 0;
|
|
err2:
|
|
nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
|
|
ARRAY_SIZE(nf_conntrack_helper_q931));
|
|
err1:
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit h323_helper_exit(void)
|
|
{
|
|
nf_conntrack_helpers_unregister(nf_conntrack_helper_ras,
|
|
ARRAY_SIZE(nf_conntrack_helper_ras));
|
|
nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
|
|
ARRAY_SIZE(nf_conntrack_helper_q931));
|
|
nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
|
|
}
|
|
|
|
static void __exit nf_conntrack_h323_fini(void)
|
|
{
|
|
h323_helper_exit();
|
|
kfree(h323_buffer);
|
|
pr_debug("nf_ct_h323: fini\n");
|
|
}
|
|
|
|
static int __init nf_conntrack_h323_init(void)
|
|
{
|
|
int ret;
|
|
|
|
NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master));
|
|
|
|
h323_buffer = kmalloc(65536, GFP_KERNEL);
|
|
if (!h323_buffer)
|
|
return -ENOMEM;
|
|
ret = h323_helper_init();
|
|
if (ret < 0)
|
|
goto err1;
|
|
pr_debug("nf_ct_h323: init success\n");
|
|
return 0;
|
|
err1:
|
|
kfree(h323_buffer);
|
|
return ret;
|
|
}
|
|
|
|
module_init(nf_conntrack_h323_init);
|
|
module_exit(nf_conntrack_h323_fini);
|
|
|
|
EXPORT_SYMBOL_GPL(get_h225_addr);
|
|
EXPORT_SYMBOL_GPL(set_h245_addr_hook);
|
|
EXPORT_SYMBOL_GPL(set_h225_addr_hook);
|
|
EXPORT_SYMBOL_GPL(set_sig_addr_hook);
|
|
EXPORT_SYMBOL_GPL(set_ras_addr_hook);
|
|
EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
|
|
EXPORT_SYMBOL_GPL(nat_t120_hook);
|
|
EXPORT_SYMBOL_GPL(nat_h245_hook);
|
|
EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
|
|
EXPORT_SYMBOL_GPL(nat_q931_hook);
|
|
|
|
MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
|
|
MODULE_DESCRIPTION("H.323 connection tracking helper");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("ip_conntrack_h323");
|
|
MODULE_ALIAS_NFCT_HELPER("RAS");
|
|
MODULE_ALIAS_NFCT_HELPER("Q.931");
|
|
MODULE_ALIAS_NFCT_HELPER("H.245");
|