moved from sys/netinet.
This commit is contained in:
christos
parent
722688d056
commit
d0905be2d3
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@ -0,0 +1,302 @@
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/* $NetBSD: ip_h323_pxy.c,v 1.1 2004/10/02 07:51:53 christos 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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* For more details, see QNX_OCL.txt provided with this distribution.
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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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# ifndef linux
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# include <sys/ioctl.h>
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# endif
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#endif
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#ifdef _KERNEL_OPT
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#include "opt_ipfilter_log.h"
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#endif
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__KERNEL_RCSID(1, "$NetBSD: ip_h323_pxy.c,v 1.1 2004/10/02 07:51:53 christos Exp $");
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#define IPF_H323_PROXY
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int ippr_h323_init __P((void));
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void ippr_h323_fini __P((void));
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int ippr_h323_new __P((fr_info_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 *, ap_session_t *, nat_t *));
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int ippr_h323_in __P((fr_info_t *, ap_session_t *, nat_t *));
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int ippr_h245_new __P((fr_info_t *, ap_session_t *, nat_t *));
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int ippr_h245_out __P((fr_info_t *, ap_session_t *, nat_t *));
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int ippr_h245_in __P((fr_info_t *, ap_session_t *, nat_t *));
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static frentry_t h323_fr;
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int h323_proxy_init = 0;
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static int find_port __P((int, caddr_t, 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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caddr_t 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, netaddr;
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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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netaddr = ntohl(ipaddr);
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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 (netaddr == 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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MUTEX_INIT(&h323_fr.fr_lock, "H323 proxy rule lock");
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h323_proxy_init = 1;
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return 0;
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}
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void ippr_h323_fini()
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{
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if (h323_proxy_init == 1) {
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MUTEX_DESTROY(&h323_fr.fr_lock);
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h323_proxy_init = 0;
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}
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}
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int ippr_h323_new(fin, aps, nat)
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fr_info_t *fin;
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ap_session_t *aps;
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nat_t *nat;
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{
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fin = fin; /* LINT */
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nat = nat; /* LINT */
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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 fr_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 (fr_nat_ioctl((caddr_t)ipn, SIOCRMNAT, NAT_SYSSPACE|
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NAT_LOCKHELD|FWRITE) == -1) {
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/*EMPTY*/;
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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_in(fin, aps, nat)
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fr_info_t *fin;
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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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caddr_t data;
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tcphdr_t *tcp;
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ip_t *ip;
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ip = fin->fin_ip;
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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 = (caddr_t)tcp + (TCP_OFF(tcp) << 2);
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datlen = fin->fin_dlen - (TCP_OFF(tcp) << 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((caddr_t)nat->nat_ptr, (caddr_t)ipn, sizeof(ipnat_t));
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(void) 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 fr_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 fr_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 fr_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 fr_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 (fr_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_new(fin, aps, nat)
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fr_info_t *fin;
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ap_session_t *aps;
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nat_t *nat;
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{
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fin = fin; /* LINT */
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nat = nat; /* LINT */
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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, aps, nat)
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fr_info_t *fin;
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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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tcphdr_t *tcp;
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caddr_t data;
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u_short port;
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ip_t *ip;
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aps = aps; /* LINT */
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ip = fin->fin_ip;
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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 = (caddr_t)tcp + (TCP_OFF(tcp) << 2);
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datlen = ip->ip_len - fin->fin_hlen - (TCP_OFF(tcp) << 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 *nat2;
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/* port = htons(port); */
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nat2 = nat_outlookup(fin->fin_ifp, IPN_UDP, IPPROTO_UDP,
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ip->ip_src, ip->ip_dst);
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if (nat2 == NULL) {
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struct ip newip;
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struct udphdr udp;
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bcopy((caddr_t)ip, (caddr_t)&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((char *)&udp, sizeof(udp));
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udp.uh_sport = port;
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bcopy((caddr_t)fin, (caddr_t)&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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nat2 = nat_new(&fi, nat->nat_ptr, NULL,
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NAT_SLAVE|IPN_UDP|SI_W_DPORT,
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NAT_OUTBOUND);
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if (nat2 != NULL) {
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(void) nat_proto(&fi, nat2, IPN_UDP);
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nat_update(&fi, nat2, nat2->nat_ptr);
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nat2->nat_ptr->in_hits++;
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#ifdef IPFILTER_LOG
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nat_log(nat2, (u_int)(nat->nat_ptr->in_redir));
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#endif
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bcopy((caddr_t)&ip->ip_src.s_addr,
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data + off, 4);
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bcopy((caddr_t)&nat2->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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@ -0,0 +1,124 @@
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/* $NetBSD: ip_netbios_pxy.c,v 1.1 2004/10/02 07:51:53 christos Exp $ */
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/*
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* Simple netbios-dgm transparent proxy for in-kernel use.
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* For use with the NAT code.
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* Id: ip_netbios_pxy.c,v 2.8 2003/12/01 02:52:16 darrenr Exp
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*/
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/*-
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* Copyright (c) 2002-2003 Paul J. Ledbetter III
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Id: ip_netbios_pxy.c,v 2.8 2003/12/01 02:52:16 darrenr Exp
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*/
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__KERNEL_RCSID(1, "$NetBSD: ip_netbios_pxy.c,v 1.1 2004/10/02 07:51:53 christos Exp $");
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#define IPF_NETBIOS_PROXY
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int ippr_netbios_init __P((void));
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void ippr_netbios_fini __P((void));
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int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *));
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static frentry_t netbiosfr;
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int netbios_proxy_init = 0;
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/*
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* Initialize local structures.
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*/
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int ippr_netbios_init()
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{
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bzero((char *)&netbiosfr, sizeof(netbiosfr));
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netbiosfr.fr_ref = 1;
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netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
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MUTEX_INIT(&netbiosfr.fr_lock, "NETBIOS proxy rule lock");
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netbios_proxy_init = 1;
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return 0;
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}
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void ippr_netbios_fini()
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{
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if (netbios_proxy_init == 1) {
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MUTEX_DESTROY(&netbiosfr.fr_lock);
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netbios_proxy_init = 0;
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}
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}
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int ippr_netbios_out(fin, aps, nat)
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fr_info_t *fin;
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ap_session_t *aps;
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nat_t *nat;
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{
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char dgmbuf[6];
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int off, dlen;
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udphdr_t *udp;
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ip_t *ip;
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mb_t *m;
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aps = aps; /* LINT */
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nat = nat; /* LINT */
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ip = fin->fin_ip;
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m = *(mb_t **)fin->fin_mp;
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off = fin->fin_hlen + sizeof(udphdr_t);
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dlen = M_LEN(m);
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dlen -= off;
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/*
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* no net bios datagram could possibly be shorter than this
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*/
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if (dlen < 11)
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return 0;
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udp = (udphdr_t *)fin->fin_dp;
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/*
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* move past the
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* ip header;
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* udp header;
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* 4 bytes into the net bios dgm header.
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* According to rfc1002, this should be the exact location of
|
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* the source address/port
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||||
*/
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off += 4;
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/* Copy NATed source Address/port*/
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dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF);
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dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF);
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dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF);
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dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF);
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dgmbuf[4] = (char)((udp->uh_sport )&0xFF);
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dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF);
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/* replace data in packet */
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COPYBACK(m, off, sizeof(dgmbuf), dgmbuf);
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return 0;
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||||
}
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||||
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|
@ -0,0 +1,271 @@
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/* $NetBSD: ip_pptp_pxy.c,v 1.1 2004/10/02 07:51:53 christos Exp $ */
|
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|
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/*
|
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* Copyright (C) 2002-2003 by Darren Reed
|
||||
*
|
||||
* Simple PPTP transparent proxy for in-kernel use. For use with the NAT
|
||||
* code.
|
||||
*
|
||||
* Id: ip_pptp_pxy.c,v 2.10.2.5 2004/06/07 14:20:05 darrenr Exp
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*
|
||||
*/
|
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#define IPF_PPTP_PROXY
|
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|
||||
typedef struct pptp_pxy {
|
||||
ipnat_t pptp_rule;
|
||||
nat_t *pptp_nat;
|
||||
ipstate_t *pptp_state;
|
||||
int pptp_seencookie;
|
||||
u_32_t pptp_cookie;
|
||||
} pptp_pxy_t;
|
||||
|
||||
|
||||
int ippr_pptp_init __P((void));
|
||||
void ippr_pptp_fini __P((void));
|
||||
int ippr_pptp_new __P((fr_info_t *, ap_session_t *, nat_t *));
|
||||
void ippr_pptp_del __P((ap_session_t *));
|
||||
int ippr_pptp_inout __P((fr_info_t *, ap_session_t *, nat_t *));
|
||||
int ippr_pptp_match __P((fr_info_t *, ap_session_t *, nat_t *));
|
||||
|
||||
static frentry_t pptpfr;
|
||||
|
||||
int pptp_proxy_init = 0;
|
||||
|
||||
|
||||
/*
|
||||
* PPTP application proxy initialization.
|
||||
*/
|
||||
int ippr_pptp_init()
|
||||
{
|
||||
bzero((char *)&pptpfr, sizeof(pptpfr));
|
||||
pptpfr.fr_ref = 1;
|
||||
pptpfr.fr_flags = FR_OUTQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
|
||||
MUTEX_INIT(&pptpfr.fr_lock, "PPTP proxy rule lock");
|
||||
pptp_proxy_init = 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
void ippr_pptp_fini()
|
||||
{
|
||||
if (pptp_proxy_init == 1) {
|
||||
MUTEX_DESTROY(&pptpfr.fr_lock);
|
||||
pptp_proxy_init = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Setup for a new PPTP proxy.
|
||||
*/
|
||||
int ippr_pptp_new(fin, aps, nat)
|
||||
fr_info_t *fin;
|
||||
ap_session_t *aps;
|
||||
nat_t *nat;
|
||||
{
|
||||
pptp_pxy_t *pptp;
|
||||
fr_info_t fi;
|
||||
ipnat_t *ipn;
|
||||
nat_t *nat2;
|
||||
int p, off;
|
||||
ip_t *ip;
|
||||
|
||||
ip = fin->fin_ip;
|
||||
off = fin->fin_hlen + sizeof(udphdr_t);
|
||||
|
||||
if (nat_outlookup(fin, 0, IPPROTO_GRE, nat->nat_inip,
|
||||
ip->ip_dst) != NULL)
|
||||
return -1;
|
||||
|
||||
aps->aps_psiz = sizeof(*pptp);
|
||||
KMALLOCS(aps->aps_data, pptp_pxy_t *, sizeof(*pptp));
|
||||
if (aps->aps_data == NULL)
|
||||
return -1;
|
||||
|
||||
ip = fin->fin_ip;
|
||||
pptp = aps->aps_data;
|
||||
bzero((char *)pptp, sizeof(*pptp));
|
||||
|
||||
/*
|
||||
* Create NAT rule against which the tunnel/transport mapping is
|
||||
* created. This is required because the current NAT rule does not
|
||||
* describe GRE but TCP instead.
|
||||
*/
|
||||
ipn = &pptp->pptp_rule;
|
||||
ipn->in_ifps[0] = fin->fin_ifp;
|
||||
ipn->in_apr = NULL;
|
||||
ipn->in_use = 1;
|
||||
ipn->in_hits = 1;
|
||||
ipn->in_nip = ntohl(nat->nat_outip.s_addr);
|
||||
ipn->in_ippip = 1;
|
||||
ipn->in_inip = nat->nat_inip.s_addr;
|
||||
ipn->in_inmsk = 0xffffffff;
|
||||
ipn->in_outip = fin->fin_saddr;
|
||||
ipn->in_outmsk = nat->nat_outip.s_addr;
|
||||
ipn->in_srcip = fin->fin_saddr;
|
||||
ipn->in_srcmsk = 0xffffffff;
|
||||
ipn->in_redir = NAT_MAP;
|
||||
bcopy(nat->nat_ptr->in_ifnames[0], ipn->in_ifnames[0],
|
||||
sizeof(ipn->in_ifnames[0]));
|
||||
ipn->in_p = IPPROTO_GRE;
|
||||
|
||||
bcopy((char *)fin, (char *)&fi, sizeof(fi));
|
||||
fi.fin_fi.fi_p = IPPROTO_GRE;
|
||||
fi.fin_fr = &pptpfr;
|
||||
fi.fin_data[0] = 0;
|
||||
fi.fin_data[1] = 0;
|
||||
p = ip->ip_p;
|
||||
ip->ip_p = IPPROTO_GRE;
|
||||
fi.fin_flx &= ~FI_TCPUDP;
|
||||
fi.fin_flx |= FI_IGNORE;
|
||||
|
||||
nat2 = nat_new(&fi, ipn, &pptp->pptp_nat, 0, NAT_OUTBOUND);
|
||||
pptp->pptp_nat = nat2;
|
||||
if (nat2 != NULL) {
|
||||
(void) nat_proto(&fi, nat2, 0);
|
||||
nat_update(&fi, nat2, nat2->nat_ptr);
|
||||
|
||||
fi.fin_data[0] = 0;
|
||||
fi.fin_data[1] = 0;
|
||||
pptp->pptp_state = fr_addstate(&fi, &pptp->pptp_state, 0);
|
||||
}
|
||||
ip->ip_p = p;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* For outgoing PPTP packets. refresh timeouts for NAT & state entries, if
|
||||
* we can. If they have disappeared, recreate them.
|
||||
*/
|
||||
int ippr_pptp_inout(fin, aps, nat)
|
||||
fr_info_t *fin;
|
||||
ap_session_t *aps;
|
||||
nat_t *nat;
|
||||
{
|
||||
pptp_pxy_t *pptp;
|
||||
fr_info_t fi;
|
||||
nat_t *nat2;
|
||||
ip_t *ip;
|
||||
int p;
|
||||
|
||||
if ((fin->fin_out == 1) && (nat->nat_dir == NAT_INBOUND))
|
||||
return 0;
|
||||
|
||||
if ((fin->fin_out == 0) && (nat->nat_dir == NAT_OUTBOUND))
|
||||
return 0;
|
||||
|
||||
pptp = aps->aps_data;
|
||||
|
||||
if (pptp != NULL) {
|
||||
ip = fin->fin_ip;
|
||||
p = ip->ip_p;
|
||||
|
||||
if ((pptp->pptp_nat == NULL) || (pptp->pptp_state == NULL)) {
|
||||
bcopy((char *)fin, (char *)&fi, sizeof(fi));
|
||||
fi.fin_fi.fi_p = IPPROTO_GRE;
|
||||
fi.fin_fr = &pptpfr;
|
||||
fi.fin_data[0] = 0;
|
||||
fi.fin_data[1] = 0;
|
||||
ip->ip_p = IPPROTO_GRE;
|
||||
fi.fin_flx &= ~FI_TCPUDP;
|
||||
fi.fin_flx |= FI_IGNORE;
|
||||
}
|
||||
|
||||
/*
|
||||
* Update NAT timeout/create NAT if missing.
|
||||
*/
|
||||
if (pptp->pptp_nat != NULL)
|
||||
fr_queueback(&pptp->pptp_nat->nat_tqe);
|
||||
else {
|
||||
nat2 = nat_new(&fi, &pptp->pptp_rule, &pptp->pptp_nat,
|
||||
NAT_SLAVE, nat->nat_dir);
|
||||
pptp->pptp_nat = nat2;
|
||||
if (nat2 != NULL) {
|
||||
(void) nat_proto(&fi, nat2, 0);
|
||||
nat_update(&fi, nat2, nat2->nat_ptr);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Update state timeout/create state if missing.
|
||||
*/
|
||||
READ_ENTER(&ipf_state);
|
||||
if (pptp->pptp_state != NULL) {
|
||||
fr_queueback(&pptp->pptp_state->is_sti);
|
||||
RWLOCK_EXIT(&ipf_state);
|
||||
} else {
|
||||
RWLOCK_EXIT(&ipf_state);
|
||||
fi.fin_data[0] = 0;
|
||||
fi.fin_data[1] = 0;
|
||||
pptp->pptp_state = fr_addstate(&fi, &pptp->pptp_state,
|
||||
0);
|
||||
}
|
||||
ip->ip_p = p;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* clean up after ourselves.
|
||||
*/
|
||||
void ippr_pptp_del(aps)
|
||||
ap_session_t *aps;
|
||||
{
|
||||
pptp_pxy_t *pptp;
|
||||
|
||||
pptp = aps->aps_data;
|
||||
|
||||
if (pptp != NULL) {
|
||||
/*
|
||||
* Don't bother changing any of the NAT structure details,
|
||||
* *_del() is on a callback from aps_free(), from nat_delete()
|
||||
*/
|
||||
|
||||
READ_ENTER(&ipf_state);
|
||||
if (pptp->pptp_state != NULL) {
|
||||
pptp->pptp_state->is_die = fr_ticks + 1;
|
||||
pptp->pptp_state->is_me = NULL;
|
||||
fr_queuefront(&pptp->pptp_state->is_sti);
|
||||
}
|
||||
RWLOCK_EXIT(&ipf_state);
|
||||
|
||||
pptp->pptp_state = NULL;
|
||||
pptp->pptp_nat = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int ippr_pptp_match(fin, aps, nat)
|
||||
fr_info_t *fin;
|
||||
ap_session_t *aps;
|
||||
nat_t *nat;
|
||||
{
|
||||
pptp_pxy_t *pptp;
|
||||
tcphdr_t *tcp;
|
||||
u_32_t cookie;
|
||||
|
||||
pptp = aps->aps_data;
|
||||
tcp = fin->fin_dp;
|
||||
|
||||
if ((pptp != NULL) && (fin->fin_dlen - (TCP_OFF(tcp) << 2) >= 8)) {
|
||||
u_char *cs;
|
||||
|
||||
cs = (u_char *)tcp + (TCP_OFF(tcp) << 2) + 4;
|
||||
|
||||
if (pptp->pptp_seencookie == 0) {
|
||||
pptp->pptp_seencookie = 1;
|
||||
pptp->pptp_cookie = (cs[0] << 24) | (cs[1] << 16) |
|
||||
(cs[2] << 8) | cs[3];
|
||||
} else {
|
||||
cookie = (cs[0] << 24) | (cs[1] << 16) |
|
||||
(cs[2] << 8) | cs[3];
|
||||
if (cookie != pptp->pptp_cookie)
|
||||
return -1;
|
||||
}
|
||||
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue