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6fd737031e
When the TPKT len included in the packet is below the lowest valid value of 4 an underflow occurs which results in an endless loop. Found by testcase 0000058 from the PROTOS c07-h2250v4 testsuite. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
1703 lines
49 KiB
C
1703 lines
49 KiB
C
/*
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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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*
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* This source code is licensed under General Public License version 2.
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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@blackhole.kfki.hu>
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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/config.h>
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#include <linux/module.h>
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#include <linux/netfilter.h>
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#include <linux/ip.h>
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#include <net/tcp.h>
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#include <linux/netfilter_ipv4/ip_conntrack.h>
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#include <linux/netfilter_ipv4/ip_conntrack_core.h>
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#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
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#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
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#include <linux/netfilter_ipv4/ip_conntrack_h323.h>
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#include <linux/moduleparam.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(format, args...)
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#endif
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/* Parameters */
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static unsigned int default_rrq_ttl = 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 = 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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/* Hooks for NAT */
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int (*set_h245_addr_hook) (struct sk_buff ** pskb,
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unsigned char **data, int dataoff,
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H245_TransportAddress * addr,
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u_int32_t ip, u_int16_t port);
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int (*set_h225_addr_hook) (struct sk_buff ** pskb,
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unsigned char **data, int dataoff,
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TransportAddress * addr,
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u_int32_t ip, u_int16_t port);
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int (*set_sig_addr_hook) (struct sk_buff ** pskb,
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struct ip_conntrack * ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data,
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TransportAddress * addr, int count);
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int (*set_ras_addr_hook) (struct sk_buff ** pskb,
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struct ip_conntrack * ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data,
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TransportAddress * addr, int count);
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int (*nat_rtp_rtcp_hook) (struct sk_buff ** pskb,
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struct ip_conntrack * ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress * addr,
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u_int16_t port, u_int16_t rtp_port,
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struct ip_conntrack_expect * rtp_exp,
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struct ip_conntrack_expect * rtcp_exp);
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int (*nat_t120_hook) (struct sk_buff ** pskb,
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struct ip_conntrack * ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress * addr, u_int16_t port,
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struct ip_conntrack_expect * exp);
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int (*nat_h245_hook) (struct sk_buff ** pskb,
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struct ip_conntrack * ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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TransportAddress * addr, u_int16_t port,
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struct ip_conntrack_expect * exp);
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int (*nat_q931_hook) (struct sk_buff ** pskb,
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struct ip_conntrack * ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, TransportAddress * addr, int idx,
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u_int16_t port, struct ip_conntrack_expect * exp);
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static DEFINE_SPINLOCK(ip_h323_lock);
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static char *h323_buffer;
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/****************************************************************************/
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static int get_tpkt_data(struct sk_buff **pskb, struct ip_conntrack *ct,
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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 ip_ct_h323_master *info = &ct->help.ct_h323_info;
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int dir = CTINFO2DIR(ctinfo);
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struct tcphdr _tcph, *th;
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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(*pskb, (*pskb)->nh.iph->ihl * 4,
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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 = (*pskb)->nh.iph->ihl * 4 + th->doff * 4;
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/* Get TCP data length */
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tcpdatalen = (*pskb)->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(*pskb, 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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DEBUGP("ip_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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if (net_ratelimit())
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printk("ip_ct_h323: "
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"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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DEBUGP("ip_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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if (net_ratelimit())
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printk("ip_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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/****************************************************************************/
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static int get_h245_addr(unsigned char *data, H245_TransportAddress * addr,
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u_int32_t * ip, u_int16_t * port)
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{
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unsigned char *p;
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if (addr->choice != eH245_TransportAddress_unicastAddress ||
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addr->unicastAddress.choice != eUnicastAddress_iPAddress)
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return 0;
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p = data + addr->unicastAddress.iPAddress.network;
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*ip = htonl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3]));
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*port = (p[4] << 8) | (p[5]);
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return 1;
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}
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/****************************************************************************/
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static int expect_rtp_rtcp(struct sk_buff **pskb, struct ip_conntrack *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress * addr)
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{
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int dir = CTINFO2DIR(ctinfo);
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int ret = 0;
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u_int32_t ip;
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u_int16_t port;
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u_int16_t rtp_port;
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struct ip_conntrack_expect *rtp_exp;
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struct ip_conntrack_expect *rtcp_exp;
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/* Read RTP or RTCP address */
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if (!get_h245_addr(*data, addr, &ip, &port) ||
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ip != ct->tuplehash[dir].tuple.src.ip || port == 0)
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return 0;
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/* RTP port is even */
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rtp_port = port & (~1);
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/* Create expect for RTP */
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if ((rtp_exp = ip_conntrack_expect_alloc(ct)) == NULL)
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return -1;
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rtp_exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
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rtp_exp->tuple.src.u.udp.port = 0;
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rtp_exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
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rtp_exp->tuple.dst.u.udp.port = htons(rtp_port);
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rtp_exp->tuple.dst.protonum = IPPROTO_UDP;
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rtp_exp->mask.src.ip = 0xFFFFFFFF;
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rtp_exp->mask.src.u.udp.port = 0;
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rtp_exp->mask.dst.ip = 0xFFFFFFFF;
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rtp_exp->mask.dst.u.udp.port = 0xFFFF;
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rtp_exp->mask.dst.protonum = 0xFF;
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rtp_exp->flags = 0;
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/* Create expect for RTCP */
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if ((rtcp_exp = ip_conntrack_expect_alloc(ct)) == NULL) {
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ip_conntrack_expect_put(rtp_exp);
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return -1;
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}
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rtcp_exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
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rtcp_exp->tuple.src.u.udp.port = 0;
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rtcp_exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
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rtcp_exp->tuple.dst.u.udp.port = htons(rtp_port + 1);
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rtcp_exp->tuple.dst.protonum = IPPROTO_UDP;
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rtcp_exp->mask.src.ip = 0xFFFFFFFF;
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rtcp_exp->mask.src.u.udp.port = 0;
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rtcp_exp->mask.dst.ip = 0xFFFFFFFF;
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rtcp_exp->mask.dst.u.udp.port = 0xFFFF;
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rtcp_exp->mask.dst.protonum = 0xFF;
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rtcp_exp->flags = 0;
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if (ct->tuplehash[dir].tuple.src.ip !=
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ct->tuplehash[!dir].tuple.dst.ip && nat_rtp_rtcp_hook) {
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/* NAT needed */
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ret = nat_rtp_rtcp_hook(pskb, ct, ctinfo, data, dataoff,
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addr, port, rtp_port, rtp_exp,
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rtcp_exp);
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} else { /* Conntrack only */
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rtp_exp->expectfn = NULL;
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rtcp_exp->expectfn = NULL;
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if (ip_conntrack_expect_related(rtp_exp) == 0) {
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if (ip_conntrack_expect_related(rtcp_exp) == 0) {
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DEBUGP("ip_ct_h323: expect RTP "
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"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
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NIPQUAD(rtp_exp->tuple.src.ip),
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ntohs(rtp_exp->tuple.src.u.udp.port),
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NIPQUAD(rtp_exp->tuple.dst.ip),
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ntohs(rtp_exp->tuple.dst.u.udp.port));
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DEBUGP("ip_ct_h323: expect RTCP "
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"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
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NIPQUAD(rtcp_exp->tuple.src.ip),
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ntohs(rtcp_exp->tuple.src.u.udp.port),
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NIPQUAD(rtcp_exp->tuple.dst.ip),
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ntohs(rtcp_exp->tuple.dst.u.udp.port));
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} else {
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ip_conntrack_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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ip_conntrack_expect_put(rtp_exp);
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ip_conntrack_expect_put(rtcp_exp);
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return ret;
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}
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/****************************************************************************/
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static int expect_t120(struct sk_buff **pskb,
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struct ip_conntrack *ct,
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enum ip_conntrack_info ctinfo,
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unsigned char **data, int dataoff,
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H245_TransportAddress * addr)
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{
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int dir = CTINFO2DIR(ctinfo);
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int ret = 0;
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u_int32_t ip;
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u_int16_t port;
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struct ip_conntrack_expect *exp = NULL;
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/* Read T.120 address */
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if (!get_h245_addr(*data, addr, &ip, &port) ||
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ip != ct->tuplehash[dir].tuple.src.ip || port == 0)
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return 0;
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/* Create expect for T.120 connections */
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if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
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return -1;
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exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
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exp->tuple.src.u.tcp.port = 0;
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exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
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exp->tuple.dst.u.tcp.port = htons(port);
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exp->tuple.dst.protonum = IPPROTO_TCP;
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exp->mask.src.ip = 0xFFFFFFFF;
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exp->mask.src.u.tcp.port = 0;
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exp->mask.dst.ip = 0xFFFFFFFF;
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exp->mask.dst.u.tcp.port = 0xFFFF;
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exp->mask.dst.protonum = 0xFF;
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exp->flags = IP_CT_EXPECT_PERMANENT; /* Accept multiple channels */
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if (ct->tuplehash[dir].tuple.src.ip !=
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ct->tuplehash[!dir].tuple.dst.ip && nat_t120_hook) {
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/* NAT needed */
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ret = nat_t120_hook(pskb, ct, ctinfo, data, dataoff, addr,
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port, exp);
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} else { /* Conntrack only */
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exp->expectfn = NULL;
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if (ip_conntrack_expect_related(exp) == 0) {
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DEBUGP("ip_ct_h323: expect T.120 "
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"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
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NIPQUAD(exp->tuple.src.ip),
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ntohs(exp->tuple.src.u.tcp.port),
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NIPQUAD(exp->tuple.dst.ip),
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ntohs(exp->tuple.dst.u.tcp.port));
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} else
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ret = -1;
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}
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|
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ip_conntrack_expect_put(exp);
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return ret;
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}
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/****************************************************************************/
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static int process_h245_channel(struct sk_buff **pskb,
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struct ip_conntrack *ct,
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enum ip_conntrack_info ctinfo,
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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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|
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if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
|
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/* RTP */
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ret = expect_rtp_rtcp(pskb, ct, ctinfo, 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->
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options & eH2250LogicalChannelParameters_mediaControlChannel) {
|
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/* RTCP */
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ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
|
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&channel->mediaControlChannel);
|
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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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return 0;
|
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}
|
|
|
|
/****************************************************************************/
|
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static int process_olc(struct sk_buff **pskb, struct ip_conntrack *ct,
|
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enum ip_conntrack_info ctinfo,
|
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unsigned char **data, int dataoff,
|
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OpenLogicalChannel * olc)
|
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{
|
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int ret;
|
|
|
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DEBUGP("ip_ct_h323: OpenLogicalChannel\n");
|
|
|
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if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
|
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eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
|
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{
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ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff,
|
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&olc->
|
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forwardLogicalChannelParameters.
|
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multiplexParameters.
|
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h2250LogicalChannelParameters);
|
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if (ret < 0)
|
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return -1;
|
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}
|
|
|
|
if ((olc->options &
|
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eOpenLogicalChannel_reverseLogicalChannelParameters) &&
|
|
(olc->reverseLogicalChannelParameters.options &
|
|
eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
|
|
&& (olc->reverseLogicalChannelParameters.multiplexParameters.
|
|
choice ==
|
|
eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
|
|
{
|
|
ret =
|
|
process_h245_channel(pskb, ct, ctinfo, data, dataoff,
|
|
&olc->
|
|
reverseLogicalChannelParameters.
|
|
multiplexParameters.
|
|
h2250LogicalChannelParameters);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((olc->options & eOpenLogicalChannel_separateStack) &&
|
|
olc->forwardLogicalChannelParameters.dataType.choice ==
|
|
eDataType_data &&
|
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olc->forwardLogicalChannelParameters.dataType.data.application.
|
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choice == eDataApplicationCapability_application_t120 &&
|
|
olc->forwardLogicalChannelParameters.dataType.data.application.
|
|
t120.choice == eDataProtocolCapability_separateLANStack &&
|
|
olc->separateStack.networkAddress.choice ==
|
|
eNetworkAccessParameters_networkAddress_localAreaAddress) {
|
|
ret = expect_t120(pskb, ct, ctinfo, data, dataoff,
|
|
&olc->separateStack.networkAddress.
|
|
localAreaAddress);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_olca(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
OpenLogicalChannelAck * olca)
|
|
{
|
|
H2250LogicalChannelAckParameters *ack;
|
|
int ret;
|
|
|
|
DEBUGP("ip_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(pskb, ct, ctinfo, 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(pskb, ct, ctinfo, data, dataoff,
|
|
&ack->mediaChannel);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (ack->options &
|
|
eH2250LogicalChannelAckParameters_mediaControlChannel) {
|
|
/* RTCP */
|
|
ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
|
|
&ack->mediaControlChannel);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_h245(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
MultimediaSystemControlMessage * mscm)
|
|
{
|
|
switch (mscm->choice) {
|
|
case eMultimediaSystemControlMessage_request:
|
|
if (mscm->request.choice ==
|
|
eRequestMessage_openLogicalChannel) {
|
|
return process_olc(pskb, ct, ctinfo, data, dataoff,
|
|
&mscm->request.openLogicalChannel);
|
|
}
|
|
DEBUGP("ip_ct_h323: H.245 Request %d\n",
|
|
mscm->request.choice);
|
|
break;
|
|
case eMultimediaSystemControlMessage_response:
|
|
if (mscm->response.choice ==
|
|
eResponseMessage_openLogicalChannelAck) {
|
|
return process_olca(pskb, ct, ctinfo, data, dataoff,
|
|
&mscm->response.
|
|
openLogicalChannelAck);
|
|
}
|
|
DEBUGP("ip_ct_h323: H.245 Response %d\n",
|
|
mscm->response.choice);
|
|
break;
|
|
default:
|
|
DEBUGP("ip_ct_h323: H.245 signal %d\n", mscm->choice);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int h245_help(struct sk_buff **pskb, struct ip_conntrack *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 + IP_CT_IS_REPLY) {
|
|
return NF_ACCEPT;
|
|
}
|
|
DEBUGP("ip_ct_h245: skblen = %u\n", (*pskb)->len);
|
|
|
|
spin_lock_bh(&ip_h323_lock);
|
|
|
|
/* Process each TPKT */
|
|
while (get_tpkt_data(pskb, ct, ctinfo, &data, &datalen, &dataoff)) {
|
|
DEBUGP("ip_ct_h245: TPKT %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
|
|
NIPQUAD((*pskb)->nh.iph->saddr),
|
|
NIPQUAD((*pskb)->nh.iph->daddr), datalen);
|
|
|
|
/* Decode H.245 signal */
|
|
ret = DecodeMultimediaSystemControlMessage(data, datalen,
|
|
&mscm);
|
|
if (ret < 0) {
|
|
if (net_ratelimit())
|
|
printk("ip_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(pskb, ct, ctinfo, &data, dataoff, &mscm) < 0)
|
|
goto drop;
|
|
}
|
|
|
|
spin_unlock_bh(&ip_h323_lock);
|
|
return NF_ACCEPT;
|
|
|
|
drop:
|
|
spin_unlock_bh(&ip_h323_lock);
|
|
if (net_ratelimit())
|
|
printk("ip_ct_h245: packet dropped\n");
|
|
return NF_DROP;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static struct ip_conntrack_helper ip_conntrack_helper_h245 = {
|
|
.name = "H.245",
|
|
.me = THIS_MODULE,
|
|
.max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */ ,
|
|
.timeout = 240,
|
|
.tuple = {.dst = {.protonum = IPPROTO_TCP}},
|
|
.mask = {.src = {.u = {0xFFFF}},
|
|
.dst = {.protonum = 0xFF}},
|
|
.help = h245_help
|
|
};
|
|
|
|
/****************************************************************************/
|
|
void ip_conntrack_h245_expect(struct ip_conntrack *new,
|
|
struct ip_conntrack_expect *this)
|
|
{
|
|
write_lock_bh(&ip_conntrack_lock);
|
|
new->helper = &ip_conntrack_helper_h245;
|
|
write_unlock_bh(&ip_conntrack_lock);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
int get_h225_addr(unsigned char *data, TransportAddress * addr,
|
|
u_int32_t * ip, u_int16_t * port)
|
|
{
|
|
unsigned char *p;
|
|
|
|
if (addr->choice != eTransportAddress_ipAddress)
|
|
return 0;
|
|
|
|
p = data + addr->ipAddress.ip;
|
|
*ip = htonl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3]));
|
|
*port = (p[4] << 8) | (p[5]);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int expect_h245(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
TransportAddress * addr)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
u_int32_t ip;
|
|
u_int16_t port;
|
|
struct ip_conntrack_expect *exp = NULL;
|
|
|
|
/* Read h245Address */
|
|
if (!get_h225_addr(*data, addr, &ip, &port) ||
|
|
ip != ct->tuplehash[dir].tuple.src.ip || port == 0)
|
|
return 0;
|
|
|
|
/* Create expect for h245 connection */
|
|
if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
|
|
exp->tuple.src.u.tcp.port = 0;
|
|
exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
|
|
exp->tuple.dst.u.tcp.port = htons(port);
|
|
exp->tuple.dst.protonum = IPPROTO_TCP;
|
|
exp->mask.src.ip = 0xFFFFFFFF;
|
|
exp->mask.src.u.tcp.port = 0;
|
|
exp->mask.dst.ip = 0xFFFFFFFF;
|
|
exp->mask.dst.u.tcp.port = 0xFFFF;
|
|
exp->mask.dst.protonum = 0xFF;
|
|
exp->flags = 0;
|
|
|
|
if (ct->tuplehash[dir].tuple.src.ip !=
|
|
ct->tuplehash[!dir].tuple.dst.ip && nat_h245_hook) {
|
|
/* NAT needed */
|
|
ret = nat_h245_hook(pskb, ct, ctinfo, data, dataoff, addr,
|
|
port, exp);
|
|
} else { /* Conntrack only */
|
|
exp->expectfn = ip_conntrack_h245_expect;
|
|
|
|
if (ip_conntrack_expect_related(exp) == 0) {
|
|
DEBUGP("ip_ct_q931: expect H.245 "
|
|
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
|
NIPQUAD(exp->tuple.src.ip),
|
|
ntohs(exp->tuple.src.u.tcp.port),
|
|
NIPQUAD(exp->tuple.dst.ip),
|
|
ntohs(exp->tuple.dst.u.tcp.port));
|
|
} else
|
|
ret = -1;
|
|
}
|
|
|
|
ip_conntrack_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_setup(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Setup_UUIE * setup)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret;
|
|
int i;
|
|
u_int32_t ip;
|
|
u_int16_t port;
|
|
|
|
DEBUGP("ip_ct_q931: Setup\n");
|
|
|
|
if (setup->options & eSetup_UUIE_h245Address) {
|
|
ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
|
|
&setup->h245Address);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
|
|
(set_h225_addr_hook) &&
|
|
get_h225_addr(*data, &setup->destCallSignalAddress, &ip, &port) &&
|
|
ip != ct->tuplehash[!dir].tuple.src.ip) {
|
|
DEBUGP("ip_ct_q931: set destCallSignalAddress "
|
|
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
|
NIPQUAD(ip), port,
|
|
NIPQUAD(ct->tuplehash[!dir].tuple.src.ip),
|
|
ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
|
|
ret = set_h225_addr_hook(pskb, data, dataoff,
|
|
&setup->destCallSignalAddress,
|
|
ct->tuplehash[!dir].tuple.src.ip,
|
|
ntohs(ct->tuplehash[!dir].tuple.src.
|
|
u.tcp.port));
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
|
|
(set_h225_addr_hook) &&
|
|
get_h225_addr(*data, &setup->sourceCallSignalAddress, &ip, &port)
|
|
&& ip != ct->tuplehash[!dir].tuple.dst.ip) {
|
|
DEBUGP("ip_ct_q931: set sourceCallSignalAddress "
|
|
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
|
NIPQUAD(ip), port,
|
|
NIPQUAD(ct->tuplehash[!dir].tuple.dst.ip),
|
|
ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
|
|
ret = set_h225_addr_hook(pskb, data, dataoff,
|
|
&setup->sourceCallSignalAddress,
|
|
ct->tuplehash[!dir].tuple.dst.ip,
|
|
ntohs(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(pskb, ct, ctinfo, data, dataoff,
|
|
&setup->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_callproceeding(struct sk_buff **pskb,
|
|
struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
CallProceeding_UUIE * callproc)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
DEBUGP("ip_ct_q931: CallProceeding\n");
|
|
|
|
if (callproc->options & eCallProceeding_UUIE_h245Address) {
|
|
ret = expect_h245(pskb, ct, ctinfo, 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(pskb, ct, ctinfo, data, dataoff,
|
|
&callproc->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_connect(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Connect_UUIE * connect)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
DEBUGP("ip_ct_q931: Connect\n");
|
|
|
|
if (connect->options & eConnect_UUIE_h245Address) {
|
|
ret = expect_h245(pskb, ct, ctinfo, 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(pskb, ct, ctinfo, data, dataoff,
|
|
&connect->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_alerting(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Alerting_UUIE * alert)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
DEBUGP("ip_ct_q931: Alerting\n");
|
|
|
|
if (alert->options & eAlerting_UUIE_h245Address) {
|
|
ret = expect_h245(pskb, ct, ctinfo, 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(pskb, ct, ctinfo, data, dataoff,
|
|
&alert->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_information(struct sk_buff **pskb,
|
|
struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Information_UUIE * info)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
DEBUGP("ip_ct_q931: Information\n");
|
|
|
|
if (info->options & eInformation_UUIE_fastStart) {
|
|
for (i = 0; i < info->fastStart.count; i++) {
|
|
ret = process_olc(pskb, ct, ctinfo, data, dataoff,
|
|
&info->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_facility(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Facility_UUIE * facility)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
DEBUGP("ip_ct_q931: Facility\n");
|
|
|
|
if (facility->options & eFacility_UUIE_h245Address) {
|
|
ret = expect_h245(pskb, ct, ctinfo, 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(pskb, ct, ctinfo, data, dataoff,
|
|
&facility->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_progress(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, int dataoff,
|
|
Progress_UUIE * progress)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
DEBUGP("ip_ct_q931: Progress\n");
|
|
|
|
if (progress->options & eProgress_UUIE_h245Address) {
|
|
ret = expect_h245(pskb, ct, ctinfo, 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(pskb, ct, ctinfo, data, dataoff,
|
|
&progress->fastStart.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_q931(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
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(pskb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.setup);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_callProceeding:
|
|
ret = process_callproceeding(pskb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.
|
|
callProceeding);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_connect:
|
|
ret = process_connect(pskb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.connect);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_alerting:
|
|
ret = process_alerting(pskb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.alerting);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_information:
|
|
ret = process_information(pskb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.
|
|
information);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_facility:
|
|
ret = process_facility(pskb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.facility);
|
|
break;
|
|
case eH323_UU_PDU_h323_message_body_progress:
|
|
ret = process_progress(pskb, ct, ctinfo, data, dataoff,
|
|
&pdu->h323_message_body.progress);
|
|
break;
|
|
default:
|
|
DEBUGP("ip_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(pskb, ct, ctinfo, data, dataoff,
|
|
&pdu->h245Control.item[i]);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int q931_help(struct sk_buff **pskb, struct ip_conntrack *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 + IP_CT_IS_REPLY) {
|
|
return NF_ACCEPT;
|
|
}
|
|
DEBUGP("ip_ct_q931: skblen = %u\n", (*pskb)->len);
|
|
|
|
spin_lock_bh(&ip_h323_lock);
|
|
|
|
/* Process each TPKT */
|
|
while (get_tpkt_data(pskb, ct, ctinfo, &data, &datalen, &dataoff)) {
|
|
DEBUGP("ip_ct_q931: TPKT %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
|
|
NIPQUAD((*pskb)->nh.iph->saddr),
|
|
NIPQUAD((*pskb)->nh.iph->daddr), datalen);
|
|
|
|
/* Decode Q.931 signal */
|
|
ret = DecodeQ931(data, datalen, &q931);
|
|
if (ret < 0) {
|
|
if (net_ratelimit())
|
|
printk("ip_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(pskb, ct, ctinfo, &data, dataoff, &q931) < 0)
|
|
goto drop;
|
|
}
|
|
|
|
spin_unlock_bh(&ip_h323_lock);
|
|
return NF_ACCEPT;
|
|
|
|
drop:
|
|
spin_unlock_bh(&ip_h323_lock);
|
|
if (net_ratelimit())
|
|
printk("ip_ct_q931: packet dropped\n");
|
|
return NF_DROP;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static struct ip_conntrack_helper ip_conntrack_helper_q931 = {
|
|
.name = "Q.931",
|
|
.me = THIS_MODULE,
|
|
.max_expected = H323_RTP_CHANNEL_MAX * 4 + 4 /* T.120 and H.245 */ ,
|
|
.timeout = 240,
|
|
.tuple = {.src = {.u = {__constant_htons(Q931_PORT)}},
|
|
.dst = {.protonum = IPPROTO_TCP}},
|
|
.mask = {.src = {.u = {0xFFFF}},
|
|
.dst = {.protonum = 0xFF}},
|
|
.help = q931_help
|
|
};
|
|
|
|
/****************************************************************************/
|
|
void ip_conntrack_q931_expect(struct ip_conntrack *new,
|
|
struct ip_conntrack_expect *this)
|
|
{
|
|
write_lock_bh(&ip_conntrack_lock);
|
|
new->helper = &ip_conntrack_helper_q931;
|
|
write_unlock_bh(&ip_conntrack_lock);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static unsigned char *get_udp_data(struct sk_buff **pskb, int *datalen)
|
|
{
|
|
struct udphdr _uh, *uh;
|
|
int dataoff;
|
|
|
|
uh = skb_header_pointer(*pskb, (*pskb)->nh.iph->ihl * 4, sizeof(_uh),
|
|
&_uh);
|
|
if (uh == NULL)
|
|
return NULL;
|
|
dataoff = (*pskb)->nh.iph->ihl * 4 + sizeof(_uh);
|
|
if (dataoff >= (*pskb)->len)
|
|
return NULL;
|
|
*datalen = (*pskb)->len - dataoff;
|
|
return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static struct ip_conntrack_expect *find_expect(struct ip_conntrack *ct,
|
|
u_int32_t ip, u_int16_t port)
|
|
{
|
|
struct ip_conntrack_expect *exp;
|
|
struct ip_conntrack_tuple tuple;
|
|
|
|
tuple.src.ip = 0;
|
|
tuple.src.u.tcp.port = 0;
|
|
tuple.dst.ip = ip;
|
|
tuple.dst.u.tcp.port = htons(port);
|
|
tuple.dst.protonum = IPPROTO_TCP;
|
|
|
|
exp = __ip_conntrack_expect_find(&tuple);
|
|
if (exp->master == ct)
|
|
return exp;
|
|
return NULL;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int set_expect_timeout(struct ip_conntrack_expect *exp,
|
|
unsigned timeout)
|
|
{
|
|
if (!exp || !del_timer(&exp->timeout))
|
|
return 0;
|
|
|
|
exp->timeout.expires = jiffies + timeout * HZ;
|
|
add_timer(&exp->timeout);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int expect_q931(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data,
|
|
TransportAddress * addr, int count)
|
|
{
|
|
struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
int i;
|
|
u_int32_t ip;
|
|
u_int16_t port;
|
|
struct ip_conntrack_expect *exp;
|
|
|
|
/* Look for the first related address */
|
|
for (i = 0; i < count; i++) {
|
|
if (get_h225_addr(*data, &addr[i], &ip, &port) &&
|
|
ip == ct->tuplehash[dir].tuple.src.ip && port != 0)
|
|
break;
|
|
}
|
|
|
|
if (i >= count) /* Not found */
|
|
return 0;
|
|
|
|
/* Create expect for Q.931 */
|
|
if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
exp->tuple.src.ip = gkrouted_only ? /* only accept calls from GK? */
|
|
ct->tuplehash[!dir].tuple.src.ip : 0;
|
|
exp->tuple.src.u.tcp.port = 0;
|
|
exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
|
|
exp->tuple.dst.u.tcp.port = htons(port);
|
|
exp->tuple.dst.protonum = IPPROTO_TCP;
|
|
exp->mask.src.ip = gkrouted_only ? 0xFFFFFFFF : 0;
|
|
exp->mask.src.u.tcp.port = 0;
|
|
exp->mask.dst.ip = 0xFFFFFFFF;
|
|
exp->mask.dst.u.tcp.port = 0xFFFF;
|
|
exp->mask.dst.protonum = 0xFF;
|
|
exp->flags = IP_CT_EXPECT_PERMANENT; /* Accept multiple calls */
|
|
|
|
if (nat_q931_hook) { /* Need NAT */
|
|
ret = nat_q931_hook(pskb, ct, ctinfo, data, addr, i,
|
|
port, exp);
|
|
} else { /* Conntrack only */
|
|
exp->expectfn = ip_conntrack_q931_expect;
|
|
|
|
if (ip_conntrack_expect_related(exp) == 0) {
|
|
DEBUGP("ip_ct_ras: expect Q.931 "
|
|
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
|
NIPQUAD(exp->tuple.src.ip),
|
|
ntohs(exp->tuple.src.u.tcp.port),
|
|
NIPQUAD(exp->tuple.dst.ip),
|
|
ntohs(exp->tuple.dst.u.tcp.port));
|
|
|
|
/* Save port for looking up expect in processing RCF */
|
|
info->sig_port[dir] = port;
|
|
} else
|
|
ret = -1;
|
|
}
|
|
|
|
ip_conntrack_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_grq(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, GatekeeperRequest * grq)
|
|
{
|
|
DEBUGP("ip_ct_ras: GRQ\n");
|
|
|
|
if (set_ras_addr_hook) /* NATed */
|
|
return set_ras_addr_hook(pskb, ct, ctinfo, data,
|
|
&grq->rasAddress, 1);
|
|
return 0;
|
|
}
|
|
|
|
/* Declare before using */
|
|
static void ip_conntrack_ras_expect(struct ip_conntrack *new,
|
|
struct ip_conntrack_expect *this);
|
|
|
|
/****************************************************************************/
|
|
static int process_gcf(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, GatekeeperConfirm * gcf)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
u_int32_t ip;
|
|
u_int16_t port;
|
|
struct ip_conntrack_expect *exp;
|
|
|
|
DEBUGP("ip_ct_ras: GCF\n");
|
|
|
|
if (!get_h225_addr(*data, &gcf->rasAddress, &ip, &port))
|
|
return 0;
|
|
|
|
/* Registration port is the same as discovery port */
|
|
if (ip == ct->tuplehash[dir].tuple.src.ip &&
|
|
port == ntohs(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 = ip_conntrack_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
|
|
exp->tuple.src.u.tcp.port = 0;
|
|
exp->tuple.dst.ip = ip;
|
|
exp->tuple.dst.u.tcp.port = htons(port);
|
|
exp->tuple.dst.protonum = IPPROTO_UDP;
|
|
exp->mask.src.ip = 0xFFFFFFFF;
|
|
exp->mask.src.u.tcp.port = 0;
|
|
exp->mask.dst.ip = 0xFFFFFFFF;
|
|
exp->mask.dst.u.tcp.port = 0xFFFF;
|
|
exp->mask.dst.protonum = 0xFF;
|
|
exp->flags = 0;
|
|
exp->expectfn = ip_conntrack_ras_expect;
|
|
if (ip_conntrack_expect_related(exp) == 0) {
|
|
DEBUGP("ip_ct_ras: expect RAS "
|
|
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
|
NIPQUAD(exp->tuple.src.ip),
|
|
ntohs(exp->tuple.src.u.tcp.port),
|
|
NIPQUAD(exp->tuple.dst.ip),
|
|
ntohs(exp->tuple.dst.u.tcp.port));
|
|
} else
|
|
ret = -1;
|
|
|
|
ip_conntrack_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_rrq(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, RegistrationRequest * rrq)
|
|
{
|
|
struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
|
|
int ret;
|
|
|
|
DEBUGP("ip_ct_ras: RRQ\n");
|
|
|
|
ret = expect_q931(pskb, ct, ctinfo, data,
|
|
rrq->callSignalAddress.item,
|
|
rrq->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
if (set_ras_addr_hook) {
|
|
ret = set_ras_addr_hook(pskb, ct, ctinfo, data,
|
|
rrq->rasAddress.item,
|
|
rrq->rasAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (rrq->options & eRegistrationRequest_timeToLive) {
|
|
DEBUGP("ip_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 **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, RegistrationConfirm * rcf)
|
|
{
|
|
struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret;
|
|
struct ip_conntrack_expect *exp;
|
|
|
|
DEBUGP("ip_ct_ras: RCF\n");
|
|
|
|
if (set_sig_addr_hook) {
|
|
ret = set_sig_addr_hook(pskb, ct, ctinfo, data,
|
|
rcf->callSignalAddress.item,
|
|
rcf->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (rcf->options & eRegistrationConfirm_timeToLive) {
|
|
DEBUGP("ip_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
|
|
info->timeout = rcf->timeToLive;
|
|
}
|
|
|
|
if (info->timeout > 0) {
|
|
DEBUGP
|
|
("ip_ct_ras: set RAS connection timeout to %u seconds\n",
|
|
info->timeout);
|
|
ip_ct_refresh_acct(ct, ctinfo, NULL, info->timeout * HZ);
|
|
|
|
/* Set expect timeout */
|
|
read_lock_bh(&ip_conntrack_lock);
|
|
exp = find_expect(ct, ct->tuplehash[dir].tuple.dst.ip,
|
|
info->sig_port[!dir]);
|
|
if (exp) {
|
|
DEBUGP("ip_ct_ras: set Q.931 expect "
|
|
"(%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu) "
|
|
"timeout to %u seconds\n",
|
|
NIPQUAD(exp->tuple.src.ip),
|
|
ntohs(exp->tuple.src.u.tcp.port),
|
|
NIPQUAD(exp->tuple.dst.ip),
|
|
ntohs(exp->tuple.dst.u.tcp.port),
|
|
info->timeout);
|
|
set_expect_timeout(exp, info->timeout);
|
|
}
|
|
read_unlock_bh(&ip_conntrack_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_urq(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, UnregistrationRequest * urq)
|
|
{
|
|
struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret;
|
|
|
|
DEBUGP("ip_ct_ras: URQ\n");
|
|
|
|
if (set_sig_addr_hook) {
|
|
ret = set_sig_addr_hook(pskb, ct, ctinfo, data,
|
|
urq->callSignalAddress.item,
|
|
urq->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
/* Clear old expect */
|
|
ip_ct_remove_expectations(ct);
|
|
info->sig_port[dir] = 0;
|
|
info->sig_port[!dir] = 0;
|
|
|
|
/* Give it 30 seconds for UCF or URJ */
|
|
ip_ct_refresh_acct(ct, ctinfo, NULL, 30 * HZ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_arq(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, AdmissionRequest * arq)
|
|
{
|
|
struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
u_int32_t ip;
|
|
u_int16_t port;
|
|
|
|
DEBUGP("ip_ct_ras: ARQ\n");
|
|
|
|
if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
|
|
get_h225_addr(*data, &arq->destCallSignalAddress, &ip, &port) &&
|
|
ip == ct->tuplehash[dir].tuple.src.ip &&
|
|
port == info->sig_port[dir] && set_h225_addr_hook) {
|
|
/* Answering ARQ */
|
|
return set_h225_addr_hook(pskb, data, 0,
|
|
&arq->destCallSignalAddress,
|
|
ct->tuplehash[!dir].tuple.dst.ip,
|
|
info->sig_port[!dir]);
|
|
}
|
|
|
|
if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
|
|
get_h225_addr(*data, &arq->srcCallSignalAddress, &ip, &port) &&
|
|
ip == ct->tuplehash[dir].tuple.src.ip && set_h225_addr_hook) {
|
|
/* Calling ARQ */
|
|
return set_h225_addr_hook(pskb, data, 0,
|
|
&arq->srcCallSignalAddress,
|
|
ct->tuplehash[!dir].tuple.dst.ip,
|
|
port);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_acf(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, AdmissionConfirm * acf)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
u_int32_t ip;
|
|
u_int16_t port;
|
|
struct ip_conntrack_expect *exp;
|
|
|
|
DEBUGP("ip_ct_ras: ACF\n");
|
|
|
|
if (!get_h225_addr(*data, &acf->destCallSignalAddress, &ip, &port))
|
|
return 0;
|
|
|
|
if (ip == ct->tuplehash[dir].tuple.dst.ip) { /* Answering ACF */
|
|
if (set_sig_addr_hook)
|
|
return set_sig_addr_hook(pskb, ct, ctinfo, data,
|
|
&acf->destCallSignalAddress,
|
|
1);
|
|
return 0;
|
|
}
|
|
|
|
/* Need new expect */
|
|
if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
|
|
exp->tuple.src.u.tcp.port = 0;
|
|
exp->tuple.dst.ip = ip;
|
|
exp->tuple.dst.u.tcp.port = htons(port);
|
|
exp->tuple.dst.protonum = IPPROTO_TCP;
|
|
exp->mask.src.ip = 0xFFFFFFFF;
|
|
exp->mask.src.u.tcp.port = 0;
|
|
exp->mask.dst.ip = 0xFFFFFFFF;
|
|
exp->mask.dst.u.tcp.port = 0xFFFF;
|
|
exp->mask.dst.protonum = 0xFF;
|
|
exp->flags = IP_CT_EXPECT_PERMANENT;
|
|
exp->expectfn = ip_conntrack_q931_expect;
|
|
|
|
if (ip_conntrack_expect_related(exp) == 0) {
|
|
DEBUGP("ip_ct_ras: expect Q.931 "
|
|
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
|
NIPQUAD(exp->tuple.src.ip),
|
|
ntohs(exp->tuple.src.u.tcp.port),
|
|
NIPQUAD(exp->tuple.dst.ip),
|
|
ntohs(exp->tuple.dst.u.tcp.port));
|
|
} else
|
|
ret = -1;
|
|
|
|
ip_conntrack_expect_put(exp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_lrq(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, LocationRequest * lrq)
|
|
{
|
|
DEBUGP("ip_ct_ras: LRQ\n");
|
|
|
|
if (set_ras_addr_hook)
|
|
return set_ras_addr_hook(pskb, ct, ctinfo, data,
|
|
&lrq->replyAddress, 1);
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_lcf(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, LocationConfirm * lcf)
|
|
{
|
|
int dir = CTINFO2DIR(ctinfo);
|
|
int ret = 0;
|
|
u_int32_t ip;
|
|
u_int16_t port;
|
|
struct ip_conntrack_expect *exp = NULL;
|
|
|
|
DEBUGP("ip_ct_ras: LCF\n");
|
|
|
|
if (!get_h225_addr(*data, &lcf->callSignalAddress, &ip, &port))
|
|
return 0;
|
|
|
|
/* Need new expect for call signal */
|
|
if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
|
|
return -1;
|
|
exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
|
|
exp->tuple.src.u.tcp.port = 0;
|
|
exp->tuple.dst.ip = ip;
|
|
exp->tuple.dst.u.tcp.port = htons(port);
|
|
exp->tuple.dst.protonum = IPPROTO_TCP;
|
|
exp->mask.src.ip = 0xFFFFFFFF;
|
|
exp->mask.src.u.tcp.port = 0;
|
|
exp->mask.dst.ip = 0xFFFFFFFF;
|
|
exp->mask.dst.u.tcp.port = 0xFFFF;
|
|
exp->mask.dst.protonum = 0xFF;
|
|
exp->flags = IP_CT_EXPECT_PERMANENT;
|
|
exp->expectfn = ip_conntrack_q931_expect;
|
|
|
|
if (ip_conntrack_expect_related(exp) == 0) {
|
|
DEBUGP("ip_ct_ras: expect Q.931 "
|
|
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
|
|
NIPQUAD(exp->tuple.src.ip),
|
|
ntohs(exp->tuple.src.u.tcp.port),
|
|
NIPQUAD(exp->tuple.dst.ip),
|
|
ntohs(exp->tuple.dst.u.tcp.port));
|
|
} else
|
|
ret = -1;
|
|
|
|
ip_conntrack_expect_put(exp);
|
|
|
|
/* Ignore rasAddress */
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_irr(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, InfoRequestResponse * irr)
|
|
{
|
|
int ret;
|
|
|
|
DEBUGP("ip_ct_ras: IRR\n");
|
|
|
|
if (set_ras_addr_hook) {
|
|
ret = set_ras_addr_hook(pskb, ct, ctinfo, data,
|
|
&irr->rasAddress, 1);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (set_sig_addr_hook) {
|
|
ret = set_sig_addr_hook(pskb, ct, ctinfo, data,
|
|
irr->callSignalAddress.item,
|
|
irr->callSignalAddress.count);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int process_ras(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo,
|
|
unsigned char **data, RasMessage * ras)
|
|
{
|
|
switch (ras->choice) {
|
|
case eRasMessage_gatekeeperRequest:
|
|
return process_grq(pskb, ct, ctinfo, data,
|
|
&ras->gatekeeperRequest);
|
|
case eRasMessage_gatekeeperConfirm:
|
|
return process_gcf(pskb, ct, ctinfo, data,
|
|
&ras->gatekeeperConfirm);
|
|
case eRasMessage_registrationRequest:
|
|
return process_rrq(pskb, ct, ctinfo, data,
|
|
&ras->registrationRequest);
|
|
case eRasMessage_registrationConfirm:
|
|
return process_rcf(pskb, ct, ctinfo, data,
|
|
&ras->registrationConfirm);
|
|
case eRasMessage_unregistrationRequest:
|
|
return process_urq(pskb, ct, ctinfo, data,
|
|
&ras->unregistrationRequest);
|
|
case eRasMessage_admissionRequest:
|
|
return process_arq(pskb, ct, ctinfo, data,
|
|
&ras->admissionRequest);
|
|
case eRasMessage_admissionConfirm:
|
|
return process_acf(pskb, ct, ctinfo, data,
|
|
&ras->admissionConfirm);
|
|
case eRasMessage_locationRequest:
|
|
return process_lrq(pskb, ct, ctinfo, data,
|
|
&ras->locationRequest);
|
|
case eRasMessage_locationConfirm:
|
|
return process_lcf(pskb, ct, ctinfo, data,
|
|
&ras->locationConfirm);
|
|
case eRasMessage_infoRequestResponse:
|
|
return process_irr(pskb, ct, ctinfo, data,
|
|
&ras->infoRequestResponse);
|
|
default:
|
|
DEBUGP("ip_ct_ras: RAS message %d\n", ras->choice);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int ras_help(struct sk_buff **pskb, struct ip_conntrack *ct,
|
|
enum ip_conntrack_info ctinfo)
|
|
{
|
|
static RasMessage ras;
|
|
unsigned char *data;
|
|
int datalen = 0;
|
|
int ret;
|
|
|
|
DEBUGP("ip_ct_ras: skblen = %u\n", (*pskb)->len);
|
|
|
|
spin_lock_bh(&ip_h323_lock);
|
|
|
|
/* Get UDP data */
|
|
data = get_udp_data(pskb, &datalen);
|
|
if (data == NULL)
|
|
goto accept;
|
|
DEBUGP("ip_ct_ras: RAS message %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
|
|
NIPQUAD((*pskb)->nh.iph->saddr),
|
|
NIPQUAD((*pskb)->nh.iph->daddr), datalen);
|
|
|
|
/* Decode RAS message */
|
|
ret = DecodeRasMessage(data, datalen, &ras);
|
|
if (ret < 0) {
|
|
if (net_ratelimit())
|
|
printk("ip_ct_ras: decoding error: %s\n",
|
|
ret == H323_ERROR_BOUND ?
|
|
"out of bound" : "out of range");
|
|
goto accept;
|
|
}
|
|
|
|
/* Process RAS message */
|
|
if (process_ras(pskb, ct, ctinfo, &data, &ras) < 0)
|
|
goto drop;
|
|
|
|
accept:
|
|
spin_unlock_bh(&ip_h323_lock);
|
|
return NF_ACCEPT;
|
|
|
|
drop:
|
|
spin_unlock_bh(&ip_h323_lock);
|
|
if (net_ratelimit())
|
|
printk("ip_ct_ras: packet dropped\n");
|
|
return NF_DROP;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static struct ip_conntrack_helper ip_conntrack_helper_ras = {
|
|
.name = "RAS",
|
|
.me = THIS_MODULE,
|
|
.max_expected = 32,
|
|
.timeout = 240,
|
|
.tuple = {.src = {.u = {__constant_htons(RAS_PORT)}},
|
|
.dst = {.protonum = IPPROTO_UDP}},
|
|
.mask = {.src = {.u = {0xFFFE}},
|
|
.dst = {.protonum = 0xFF}},
|
|
.help = ras_help,
|
|
};
|
|
|
|
/****************************************************************************/
|
|
static void ip_conntrack_ras_expect(struct ip_conntrack *new,
|
|
struct ip_conntrack_expect *this)
|
|
{
|
|
write_lock_bh(&ip_conntrack_lock);
|
|
new->helper = &ip_conntrack_helper_ras;
|
|
write_unlock_bh(&ip_conntrack_lock);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
/* Not __exit - called from init() */
|
|
static void fini(void)
|
|
{
|
|
ip_conntrack_helper_unregister(&ip_conntrack_helper_ras);
|
|
ip_conntrack_helper_unregister(&ip_conntrack_helper_q931);
|
|
kfree(h323_buffer);
|
|
DEBUGP("ip_ct_h323: fini\n");
|
|
}
|
|
|
|
/****************************************************************************/
|
|
static int __init init(void)
|
|
{
|
|
int ret;
|
|
|
|
h323_buffer = kmalloc(65536, GFP_KERNEL);
|
|
if (!h323_buffer)
|
|
return -ENOMEM;
|
|
if ((ret = ip_conntrack_helper_register(&ip_conntrack_helper_q931)) ||
|
|
(ret = ip_conntrack_helper_register(&ip_conntrack_helper_ras))) {
|
|
fini();
|
|
return ret;
|
|
}
|
|
|
|
DEBUGP("ip_ct_h323: init success\n");
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
module_init(init);
|
|
module_exit(fini);
|
|
|
|
EXPORT_SYMBOL_GPL(get_h225_addr);
|
|
EXPORT_SYMBOL_GPL(ip_conntrack_h245_expect);
|
|
EXPORT_SYMBOL_GPL(ip_conntrack_q931_expect);
|
|
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_q931_hook);
|
|
|
|
MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
|
|
MODULE_DESCRIPTION("H.323 connection tracking helper");
|
|
MODULE_LICENSE("GPL");
|