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martti
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/* $NetBSD: ip_h323_pxy.c,v 1.1.1.1 2002/05/02 16:48:42 martti Exp $ */
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/*
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* Copyright 2001, QNX Software Systems Ltd. All Rights Reserved
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*
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* This source code has been published by QNX Software Systems Ltd. (QSSL).
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* However, any use, reproduction, modification, distribution or transfer of
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* this software, or any software which includes or is based upon any of this
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* code, is only permitted under the terms of the QNX Open Community License
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* version 1.0 (see licensing.qnx.com for details) or as otherwise expressly
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* authorized by a written license agreement from QSSL. For more information,
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* please email licensing@qnx.com.
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*
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*/
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/*
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* Simple H.323 proxy
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*
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* by xtang@canada.com
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* ported to ipfilter 3.4.20 by Michael Grant mg-ipf@grant.org
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*/
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#if __FreeBSD_version >= 220000 && defined(_KERNEL)
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# include <sys/fcntl.h>
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# include <sys/filio.h>
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#else
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# include <sys/ioctl.h>
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#endif
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#define IPF_H323_PROXY
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int ippr_h323_init __P((void));
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int ippr_h323_new __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
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void ippr_h323_del __P((ap_session_t *));
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int ippr_h323_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
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int ippr_h323_in __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
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int ippr_h245_init __P((void));
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int ippr_h245_new __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
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int ippr_h245_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
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int ippr_h245_in __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
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static frentry_t h323_fr;
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#if (SOLARIS || defined(__sgi)) && defined(_KERNEL)
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extern KRWLOCK_T ipf_nat;
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#endif
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static int find_port __P((int, u_char *, int datlen, int *, u_short *));
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static int find_port(ipaddr, data, datlen, off, port)
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int ipaddr;
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unsigned char *data;
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int datlen, *off;
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unsigned short *port;
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{
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u_32_t addr;
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u_char *dp;
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int offset;
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if (datlen < 6)
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return -1;
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*port = 0;
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offset = *off;
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dp = (u_char *)data;
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for (offset = 0; offset <= datlen - 6; offset++, dp++) {
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addr = (dp[0] << 24) | (dp[1] << 16) | (dp[2] << 8) | dp[3];
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if (ipaddr == addr)
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{
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*port = (*(dp + 4) << 8) | *(dp + 5);
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break;
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}
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}
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*off = offset;
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return (offset > datlen - 6) ? -1 : 0;
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}
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/*
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* Initialize local structures.
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*/
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int ippr_h323_init()
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{
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bzero((char *)&h323_fr, sizeof(h323_fr));
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h323_fr.fr_ref = 1;
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h323_fr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
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return 0;
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}
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int ippr_h323_new(fin, ip, aps, nat)
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fr_info_t *fin;
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ip_t *ip;
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ap_session_t *aps;
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nat_t *nat;
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{
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aps->aps_data = NULL;
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aps->aps_psiz = 0;
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return 0;
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}
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void ippr_h323_del(aps)
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ap_session_t *aps;
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{
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int i;
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ipnat_t *ipn;
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if (aps->aps_data) {
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for (i = 0, ipn = aps->aps_data;
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i < (aps->aps_psiz / sizeof(ipnat_t));
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i++, ipn = (ipnat_t *)((char *)ipn + sizeof(*ipn)))
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{
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/*
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* Check the comment in ippr_h323_in() function,
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* just above nat_ioctl() call.
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* We are lucky here because this function is not
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* called with ipf_nat locked.
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*/
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if (nat_ioctl((caddr_t)ipn, SIOCRMNAT, NAT_SYSSPACE|
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NAT_LOCKHELD|FWRITE) == -1) {
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/* log the error */
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}
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}
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KFREES(aps->aps_data, aps->aps_psiz);
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/* avoid double free */
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aps->aps_data = NULL;
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aps->aps_psiz = 0;
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}
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return;
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}
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int ippr_h323_out(fin, ip, aps, nat)
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fr_info_t *fin;
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ip_t *ip;
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ap_session_t *aps;
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nat_t *nat;
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{
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return 0;
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}
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int ippr_h323_in(fin, ip, aps, nat)
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fr_info_t *fin;
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ip_t *ip;
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ap_session_t *aps;
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nat_t *nat;
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{
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int ipaddr, off, datlen;
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unsigned short port;
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unsigned char *data;
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tcphdr_t *tcp;
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tcp = (tcphdr_t *)fin->fin_dp;
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ipaddr = ip->ip_src.s_addr;
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data = (unsigned char *)tcp + (tcp->th_off << 2);
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datlen = fin->fin_dlen - (tcp->th_off << 2);
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if (find_port(ipaddr, data, datlen, &off, &port) == 0) {
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ipnat_t *ipn;
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char *newarray;
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/* setup a nat rule to set a h245 proxy on tcp-port "port"
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* it's like:
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* map <if> <inter_ip>/<mask> -> <gate_ip>/<mask> proxy port <port> <port>/tcp
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*/
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KMALLOCS(newarray, char *, aps->aps_psiz + sizeof(*ipn));
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if (newarray == NULL) {
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return -1;
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}
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ipn = (ipnat_t *)&newarray[aps->aps_psiz];
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bcopy(nat->nat_ptr, ipn, sizeof(ipnat_t));
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strncpy(ipn->in_plabel, "h245", APR_LABELLEN);
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ipn->in_inip = nat->nat_inip.s_addr;
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ipn->in_inmsk = 0xffffffff;
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ipn->in_dport = htons(port);
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/*
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* we got a problem here. we need to call nat_ioctl() to add
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* the h245 proxy rule, but since we already hold (READ locked)
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* the nat table rwlock (ipf_nat), if we go into nat_ioctl(),
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* it will try to WRITE lock it. This will causing dead lock
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* on RTP.
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*
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* The quick & dirty solution here is release the read lock,
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* call nat_ioctl() and re-lock it.
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* A (maybe better) solution is do a UPGRADE(), and instead
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* of calling nat_ioctl(), we add the nat rule ourself.
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*/
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RWLOCK_EXIT(&ipf_nat);
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if (nat_ioctl((caddr_t)ipn, SIOCADNAT,
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NAT_SYSSPACE|FWRITE) == -1) {
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READ_ENTER(&ipf_nat);
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return -1;
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}
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READ_ENTER(&ipf_nat);
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if (aps->aps_data != NULL && aps->aps_psiz > 0) {
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bcopy(aps->aps_data, newarray, aps->aps_psiz);
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KFREES(aps->aps_data, aps->aps_psiz);
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}
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aps->aps_data = newarray;
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aps->aps_psiz += sizeof(*ipn);
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}
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return 0;
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}
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int ippr_h245_init()
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{
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return 0;
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}
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int ippr_h245_new(fin, ip, aps, nat)
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fr_info_t *fin;
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ip_t *ip;
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ap_session_t *aps;
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nat_t *nat;
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{
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aps->aps_data = NULL;
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aps->aps_psiz = 0;
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return 0;
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}
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int ippr_h245_out(fin, ip, aps, nat)
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fr_info_t *fin;
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ip_t *ip;
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ap_session_t *aps;
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nat_t *nat;
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{
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int ipaddr, off, datlen;
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u_short port;
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unsigned char *data;
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tcphdr_t *tcp;
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tcp = (tcphdr_t *)fin->fin_dp;
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ipaddr = nat->nat_inip.s_addr;
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data = (unsigned char *)tcp + (tcp->th_off << 2);
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datlen = ip->ip_len - fin->fin_hlen - (tcp->th_off << 2);
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if (find_port(ipaddr, data, datlen, &off, &port) == 0) {
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fr_info_t fi;
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nat_t *ipn;
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/* port = htons(port); */
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ipn = nat_outlookup(fin->fin_ifp, IPN_UDP, IPPROTO_UDP,
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ip->ip_src, ip->ip_dst, 1);
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if (ipn == NULL) {
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struct ip newip;
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struct udphdr udp;
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bcopy(ip, &newip, sizeof(newip));
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newip.ip_len = fin->fin_hlen + sizeof(udp);
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newip.ip_p = IPPROTO_UDP;
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newip.ip_src = nat->nat_inip;
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bzero(&udp, sizeof(udp));
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udp.uh_sport = port;
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bcopy(fin, &fi, sizeof(fi));
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fi.fin_fi.fi_p = IPPROTO_UDP;
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fi.fin_data[0] = port;
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fi.fin_data[1] = 0;
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fi.fin_dp = (char *)&udp;
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ipn = nat_new(&fi, &newip, nat->nat_ptr, NULL,
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IPN_UDP|FI_W_DPORT, NAT_OUTBOUND);
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if (ipn != NULL) {
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ipn->nat_ptr->in_hits++;
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#ifdef IPFILTER_LOG
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nat_log(ipn, (u_int)(nat->nat_ptr->in_redir));
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#endif
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bcopy((u_char*)&ip->ip_src.s_addr,
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data + off, 4);
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bcopy((u_char*)&ipn->nat_outport,
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data + off + 4, 2);
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}
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}
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}
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return 0;
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}
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int ippr_h245_in(fin, ip, aps, nat)
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fr_info_t *fin;
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ip_t *ip;
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ap_session_t *aps;
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nat_t *nat;
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{
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return 0;
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}
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