Import IPFilter 3.4.25 (last version 3.4.20)
This commit is contained in:
Darren Reed
parent
fb1ae013ab
commit
28613e5584
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/vendor-sys/ipfilter/dist/; revision=92680
275
sys/contrib/ipfilter/netinet/ip_h323_pxy.c
Normal file
275
sys/contrib/ipfilter/netinet/ip_h323_pxy.c
Normal file
@ -0,0 +1,275 @@
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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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if (datlen < 6)
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return -1;
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*port = 0;
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for (*off = 0; *off <= datlen - 6; *off = *off + 1) {
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if (ipaddr == *(int *)(data + *off))
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{
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*port = (*(data + *off + 4) << 8) + *(data + *off +5);
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break;
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}
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}
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return (*off > 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, 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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}
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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 = ip->ip_len - (ip->ip_hl << 2) - (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, 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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bcopy(aps->aps_data, newarray, aps->aps_psiz);
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KFREES(aps->aps_data, aps->aps_psiz);
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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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*(int *)(data + off) = ip->ip_src.s_addr;
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*(short *)(data + off + 4) = ipn->nat_outport;
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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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292
sys/contrib/ipfilter/netinet/ip_ipsec_pxy.c
Normal file
292
sys/contrib/ipfilter/netinet/ip_ipsec_pxy.c
Normal file
@ -0,0 +1,292 @@
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/*
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* Simple ISAKMP transparent proxy for in-kernel use. For use with the NAT
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* code.
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*
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* $Id: ip_ipsec_pxy.c,v 1.1.2.10 2002/01/13 04:58:29 darrenr Exp $
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*
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*/
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#define IPF_IPSEC_PROXY
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int ippr_ipsec_init __P((void));
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int ippr_ipsec_new __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
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void ippr_ipsec_del __P((ap_session_t *));
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int ippr_ipsec_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
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int ippr_ipsec_match __P((fr_info_t *, ap_session_t *, nat_t *));
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static frentry_t ipsecfr;
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static char ipsec_buffer[1500];
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/*
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* RCMD application proxy initialization.
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*/
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int ippr_ipsec_init()
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{
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bzero((char *)&ipsecfr, sizeof(ipsecfr));
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ipsecfr.fr_ref = 1;
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ipsecfr.fr_flags = FR_OUTQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
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return 0;
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}
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/*
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* Setup for a new IPSEC proxy.
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*/
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int ippr_ipsec_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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ipsec_pxy_t *ipsec;
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fr_info_t fi;
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ipnat_t *ipn;
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char *ptr;
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int p, off, dlen;
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mb_t *m;
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bzero(ipsec_buffer, sizeof(ipsec_buffer));
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off = fin->fin_hlen + sizeof(udphdr_t);
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#ifdef _KERNEL
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# if SOLARIS
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m = fin->fin_qfm;
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dlen = msgdsize(m) - off;
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if (dlen < 16)
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return -1;
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copyout_mblk(m, off, MIN(sizeof(ipsec_buffer), dlen), ipsec_buffer);
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# else
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m = *(mb_t **)fin->fin_mp;
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dlen = mbufchainlen(m) - off;
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if (dlen < 16)
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return -1;
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m_copydata(m, off, MIN(sizeof(ipsec_buffer), dlen), ipsec_buffer);
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# endif
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#else
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m = *(mb_t **)fin->fin_mp;
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dlen = ip->ip_len - off;
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ptr = (char *)m;
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ptr += off;
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bcopy(ptr, ipsec_buffer, MIN(sizeof(ipsec_buffer), dlen));
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#endif
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/*
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* Because _new() gets called from nat_new(), ipf_nat is held with a
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* write lock so pass rw=1 to nat_outlookup().
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*/
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if (nat_outlookup(fin, 0, IPPROTO_ESP, nat->nat_inip,
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ip->ip_dst, 1) != NULL)
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return -1;
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aps->aps_psiz = sizeof(*ipsec);
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KMALLOCS(aps->aps_data, ipsec_pxy_t *, sizeof(*ipsec));
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if (aps->aps_data == NULL)
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return -1;
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ipsec = aps->aps_data;
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bzero((char *)ipsec, sizeof(*ipsec));
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/*
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* Create NAT rule against which the tunnel/transport mapping is
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* created. This is required because the current NAT rule does not
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* describe ESP but UDP instead.
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*/
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ipn = &ipsec->ipsc_rule;
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ipn->in_ifp = fin->fin_ifp;
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ipn->in_apr = NULL;
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ipn->in_use = 1;
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ipn->in_hits = 1;
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ipn->in_nip = ntohl(nat->nat_outip.s_addr);
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ipn->in_ippip = 1;
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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_outip = nat->nat_outip.s_addr;
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ipn->in_outmsk = 0xffffffff;
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ipn->in_srcip = fin->fin_saddr;
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ipn->in_srcmsk = 0xffffffff;
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ipn->in_redir = NAT_MAP;
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bcopy(nat->nat_ptr->in_ifname, ipn->in_ifname, sizeof(ipn->in_ifname));
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ipn->in_p = IPPROTO_ESP;
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bcopy((char *)fin, (char *)&fi, sizeof(fi));
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fi.fin_fi.fi_p = IPPROTO_ESP;
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fi.fin_fr = &ipsecfr;
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fi.fin_data[0] = 0;
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fi.fin_data[1] = 0;
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p = ip->ip_p;
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ip->ip_p = IPPROTO_ESP;
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fi.fin_fl &= ~FI_TCPUDP;
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ptr = ipsec_buffer;
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bcopy(ptr, ipsec->ipsc_icookie, sizeof(ipsec_cookie_t));
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ptr += sizeof(ipsec_cookie_t);
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bcopy(ptr, ipsec->ipsc_rcookie, sizeof(ipsec_cookie_t));
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/*
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* The responder cookie should only be non-zero if the initiator
|
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* cookie is non-zero. Therefore, it is safe to assume(!) that the
|
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* cookies are both set after copying if the responder is non-zero.
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*/
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if ((ipsec->ipsc_rcookie[0]|ipsec->ipsc_rcookie[1]) != 0)
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ipsec->ipsc_rckset = 1;
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else
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nat->nat_age = 60; /* 30 seconds */
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ipsec->ipsc_nat = nat_new(&fi, ip, ipn, &ipsec->ipsc_nat, FI_IGNOREPKT,
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NAT_OUTBOUND);
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if (ipsec->ipsc_nat != NULL) {
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fi.fin_data[0] = 0;
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fi.fin_data[1] = 0;
|
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ipsec->ipsc_state = fr_addstate(ip, &fi, &ipsec->ipsc_state,
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FI_IGNOREPKT|FI_NORULE);
|
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}
|
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ip->ip_p = p;
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return 0;
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}
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/*
|
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* For outgoing IKE packets. refresh timeouts for NAT & stat entries, if
|
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* we can. If they have disappeared, recreate them.
|
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*/
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int ippr_ipsec_out(fin, ip, aps, nat)
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fr_info_t *fin;
|
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ip_t *ip;
|
||||
ap_session_t *aps;
|
||||
nat_t *nat;
|
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{
|
||||
ipsec_pxy_t *ipsec;
|
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fr_info_t fi;
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||||
int p;
|
||||
|
||||
bcopy((char *)fin, (char *)&fi, sizeof(fi));
|
||||
fi.fin_fi.fi_p = IPPROTO_ESP;
|
||||
fi.fin_fr = &ipsecfr;
|
||||
fi.fin_data[0] = 0;
|
||||
fi.fin_data[1] = 0;
|
||||
p = ip->ip_p;
|
||||
ip->ip_p = IPPROTO_ESP;
|
||||
fi.fin_fl &= ~FI_TCPUDP;
|
||||
|
||||
ipsec = aps->aps_data;
|
||||
if (ipsec != NULL) {
|
||||
/*
|
||||
* Update NAT timeout/create NAT if missing.
|
||||
*/
|
||||
if (ipsec->ipsc_rckset == 0)
|
||||
nat->nat_age = 60; /* 30 seconds */
|
||||
if (ipsec->ipsc_nat != NULL)
|
||||
ipsec->ipsc_nat->nat_age = nat->nat_age;
|
||||
else
|
||||
ipsec->ipsc_nat = nat_new(&fi, ip, &ipsec->ipsc_rule,
|
||||
&ipsec->ipsc_nat,
|
||||
FI_IGNOREPKT, NAT_OUTBOUND);
|
||||
|
||||
/*
|
||||
* Update state timeout/create state if missing.
|
||||
*/
|
||||
READ_ENTER(&ipf_state);
|
||||
if (ipsec->ipsc_state != NULL) {
|
||||
ipsec->ipsc_state->is_age = nat->nat_age;
|
||||
RWLOCK_EXIT(&ipf_state);
|
||||
} else {
|
||||
RWLOCK_EXIT(&ipf_state);
|
||||
fi.fin_data[0] = 0;
|
||||
fi.fin_data[1] = 0;
|
||||
ipsec->ipsc_state = fr_addstate(ip, &fi,
|
||||
&ipsec->ipsc_state,
|
||||
FI_IGNOREPKT|FI_NORULE);
|
||||
}
|
||||
}
|
||||
ip->ip_p = p;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* This extends the NAT matching to be based on the cookies associated with
|
||||
* a session and found at the front of IKE packets. The cookies are always
|
||||
* in the same order (not reversed depending on packet flow direction as with
|
||||
* UDP/TCP port numbers).
|
||||
*/
|
||||
int ippr_ipsec_match(fin, aps, nat)
|
||||
fr_info_t *fin;
|
||||
ap_session_t *aps;
|
||||
nat_t *nat;
|
||||
{
|
||||
ipsec_pxy_t *ipsec;
|
||||
u_32_t cookies[4];
|
||||
mb_t *m;
|
||||
int off;
|
||||
|
||||
if ((fin->fin_dlen < sizeof(cookies)) || (fin->fin_fl & FI_FRAG))
|
||||
return -1;
|
||||
|
||||
ipsec = aps->aps_data;
|
||||
off = fin->fin_hlen + sizeof(udphdr_t);
|
||||
#ifdef _KERNEL
|
||||
# if SOLARIS
|
||||
m = fin->fin_qfm;
|
||||
|
||||
copyout_mblk(m, off, sizeof(cookies), (char *)cookies);
|
||||
# else
|
||||
m = *(mb_t **)fin->fin_mp;
|
||||
m_copydata(m, off, sizeof(cookies), (char *)cookies);
|
||||
# endif
|
||||
#else
|
||||
m = *(mb_t **)fin->fin_mp;
|
||||
bcopy((char *)m + off, cookies, sizeof(cookies));
|
||||
#endif
|
||||
|
||||
if ((cookies[0] != ipsec->ipsc_icookie[0]) ||
|
||||
(cookies[1] != ipsec->ipsc_icookie[1]))
|
||||
return -1;
|
||||
|
||||
if (ipsec->ipsc_rckset == 0) {
|
||||
if ((cookies[2]|cookies[3]) == 0) {
|
||||
nat->nat_age = 60; /* 30 seconds */
|
||||
return 0;
|
||||
}
|
||||
ipsec->ipsc_rckset = 1;
|
||||
ipsec->ipsc_rcookie[0] = cookies[2];
|
||||
ipsec->ipsc_rcookie[1] = cookies[3];
|
||||
return 0;
|
||||
}
|
||||
|
||||
if ((cookies[2] != ipsec->ipsc_rcookie[0]) ||
|
||||
(cookies[3] != ipsec->ipsc_rcookie[1]))
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* clean up after ourselves.
|
||||
*/
|
||||
void ippr_ipsec_del(aps)
|
||||
ap_session_t *aps;
|
||||
{
|
||||
ipsec_pxy_t *ipsec;
|
||||
|
||||
ipsec = aps->aps_data;
|
||||
|
||||
if (ipsec != NULL) {
|
||||
/*
|
||||
* Don't delete it from here, just schedule it to be
|
||||
* deleted ASAP.
|
||||
*/
|
||||
if (ipsec->ipsc_nat != NULL) {
|
||||
ipsec->ipsc_nat->nat_age = 1;
|
||||
ipsec->ipsc_nat->nat_ptr = NULL;
|
||||
}
|
||||
|
||||
READ_ENTER(&ipf_state);
|
||||
if (ipsec->ipsc_state != NULL)
|
||||
ipsec->ipsc_state->is_age = 1;
|
||||
RWLOCK_EXIT(&ipf_state);
|
||||
|
||||
ipsec->ipsc_state = NULL;
|
||||
ipsec->ipsc_nat = NULL;
|
||||
}
|
||||
}
|
||||
109
sys/contrib/ipfilter/netinet/ip_netbios_pxy.c
Normal file
109
sys/contrib/ipfilter/netinet/ip_netbios_pxy.c
Normal file
@ -0,0 +1,109 @@
|
||||
/*
|
||||
* Simple netbios-dgm transparent proxy for in-kernel use.
|
||||
* For use with the NAT code.
|
||||
* $Id: ip_netbios_pxy.c,v 1.1.2.3 2002/01/09 09:28:37 darrenr Exp $
|
||||
*/
|
||||
|
||||
/*-
|
||||
* Copyright (c) 2002 Paul J. Ledbetter III
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* $Id: ip_netbios_pxy.c,v 1.1.2.3 2002/01/09 09:28:37 darrenr Exp $
|
||||
*/
|
||||
|
||||
#define IPF_NETBIOS_PROXY
|
||||
|
||||
int ippr_netbios_init __P((void));
|
||||
int ippr_netbios_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
|
||||
|
||||
static frentry_t netbiosfr;
|
||||
|
||||
/*
|
||||
* Initialize local structures.
|
||||
*/
|
||||
int ippr_netbios_init()
|
||||
{
|
||||
bzero((char *)&netbiosfr, sizeof(netbiosfr));
|
||||
netbiosfr.fr_ref = 1;
|
||||
netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int ippr_netbios_out(fin, ip, aps, nat)
|
||||
fr_info_t *fin;
|
||||
ip_t *ip;
|
||||
ap_session_t *aps;
|
||||
nat_t *nat;
|
||||
{
|
||||
char dgmbuf[6];
|
||||
|
||||
int off, dlen;
|
||||
udphdr_t *udp;
|
||||
mb_t *m;
|
||||
|
||||
m = *(mb_t **)fin->fin_mp;
|
||||
off = fin->fin_hlen + sizeof(udphdr_t);
|
||||
#if SOLARIS
|
||||
dlen = msgdsize(m);
|
||||
#else
|
||||
dlen = mbufchainlen(m);
|
||||
#endif
|
||||
dlen -= off;
|
||||
|
||||
/*
|
||||
* no net bios datagram could possibly be shorter than this
|
||||
*/
|
||||
if (dlen < 11)
|
||||
return 0;
|
||||
|
||||
udp = (udphdr_t *)fin->fin_dp;
|
||||
|
||||
/*
|
||||
* move past the
|
||||
* ip header;
|
||||
* udp header;
|
||||
* 4 bytes into the net bios dgm header.
|
||||
* According to rfc1002, this should be the exact location of
|
||||
* the source address/port
|
||||
*/
|
||||
off += 4;
|
||||
|
||||
/* Copy NATed source Address/port*/
|
||||
dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF);
|
||||
dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF);
|
||||
dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF);
|
||||
dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF);
|
||||
|
||||
dgmbuf[4] = (char)((udp->uh_sport )&0xFF);
|
||||
dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF);
|
||||
|
||||
/* replace data in packet */
|
||||
#if SOLARIS
|
||||
copyin_mblk(m, off, sizeof(dgmbuf), dgmbuf);
|
||||
#else
|
||||
m_copyback(m, off, sizeof(dgmbuf), dgmbuf);
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user