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[src/trunk]: src/sys/netinet Import H.323 proxy of IPFilter 3.4.25. Upon clo...
details: https://anonhg.NetBSD.org/src/rev/61c6ec1c34db
branches: trunk
changeset: 524884:61c6ec1c34db
user: jdolecek <jdolecek%NetBSD.org@localhost>
date: Mon Apr 01 16:29:31 2002 +0000
description:
Import H.323 proxy of IPFilter 3.4.25. Upon closer examination,
the QNX licence seems to be allow both non-commercial and commercial
use actually.
According to Darren, the H.323 proxy code is buggy ATM, but is imported
here for reference anyway.
diffstat:
sys/netinet/ip_h323_pxy.c | 275 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 275 insertions(+), 0 deletions(-)
diffs (279 lines):
diff -r 4f9610e975a6 -r 61c6ec1c34db sys/netinet/ip_h323_pxy.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/netinet/ip_h323_pxy.c Mon Apr 01 16:29:31 2002 +0000
@@ -0,0 +1,275 @@
+/*
+ * Copyright 2001, QNX Software Systems Ltd. All Rights Reserved
+ *
+ * This source code has been published by QNX Software Systems Ltd. (QSSL).
+ * However, any use, reproduction, modification, distribution or transfer of
+ * this software, or any software which includes or is based upon any of this
+ * code, is only permitted under the terms of the QNX Open Community License
+ * version 1.0 (see licensing.qnx.com for details) or as otherwise expressly
+ * authorized by a written license agreement from QSSL. For more information,
+ * please email licensing%qnx.com@localhost.
+ *
+ */
+
+/*
+ * Simple H.323 proxy
+ *
+ * by xtang%canada.com@localhost
+ * ported to ipfilter 3.4.20 by Michael Grant mg-ipf%grant.org@localhost
+ */
+
+#if __FreeBSD_version >= 220000 && defined(_KERNEL)
+# include <sys/fcntl.h>
+# include <sys/filio.h>
+#else
+# include <sys/ioctl.h>
+#endif
+
+#define IPF_H323_PROXY
+
+int ippr_h323_init __P((void));
+int ippr_h323_new __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+void ippr_h323_del __P((ap_session_t *));
+int ippr_h323_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+int ippr_h323_in __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+
+int ippr_h245_init __P((void));
+int ippr_h245_new __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+int ippr_h245_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+int ippr_h245_in __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+
+static frentry_t h323_fr;
+#if (SOLARIS || defined(__sgi)) && defined(_KERNEL)
+extern KRWLOCK_T ipf_nat;
+#endif
+
+static int find_port __P((int, u_char *, int datlen, int *, u_short *));
+
+
+static int find_port(ipaddr, data, datlen, off, port)
+int ipaddr;
+unsigned char *data;
+int datlen, *off;
+unsigned short *port;
+{
+ if (datlen < 6)
+ return -1;
+
+ *port = 0;
+ for (*off = 0; *off <= datlen - 6; *off = *off + 1) {
+ if (ipaddr == *(int *)(data + *off))
+ {
+ *port = (*(data + *off + 4) << 8) + *(data + *off +5);
+ break;
+ }
+ }
+ return (*off > datlen - 6) ? -1 : 0;
+}
+
+/*
+ * Initialize local structures.
+ */
+int ippr_h323_init()
+{
+ bzero((char *)&h323_fr, sizeof(h323_fr));
+ h323_fr.fr_ref = 1;
+ h323_fr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
+
+ return 0;
+}
+
+
+int ippr_h323_new(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+ aps->aps_data = NULL;
+ aps->aps_psiz = 0;
+
+ return 0;
+}
+
+
+void ippr_h323_del(aps)
+ap_session_t *aps;
+{
+ int i;
+ ipnat_t *ipn;
+
+ if (aps->aps_data) {
+ for (i = 0, ipn = aps->aps_data;
+ i < (aps->aps_psiz / sizeof(ipnat_t));
+ i++, ipn = (ipnat_t *)((char *)ipn + sizeof(*ipn)))
+ {
+ /*
+ * Check the comment in ippr_h323_in() function,
+ * just above nat_ioctl() call.
+ * We are lucky here because this function is not
+ * called with ipf_nat locked.
+ */
+ if (nat_ioctl((caddr_t)ipn, SIOCRMNAT, FWRITE) == -1) {
+ /* log the error */
+ }
+ }
+ KFREES(aps->aps_data, aps->aps_psiz);
+ }
+ return;
+}
+
+
+int ippr_h323_out(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+ return 0;
+}
+
+
+int ippr_h323_in(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+ int ipaddr, off, datlen;
+ unsigned short port;
+ unsigned char *data;
+ tcphdr_t *tcp;
+
+ tcp = (tcphdr_t *)fin->fin_dp;
+ ipaddr = ip->ip_src.s_addr;
+
+ data = (unsigned char *)tcp + (tcp->th_off << 2);
+ datlen = ip->ip_len - (ip->ip_hl << 2) - (tcp->th_off << 2);
+ if (find_port(ipaddr, data, datlen, &off, &port) == 0) {
+ ipnat_t *ipn;
+ char *newarray;
+
+ /* setup a nat rule to set a h245 proxy on tcp-port "port"
+ * it's like:
+ * map <if> <inter_ip>/<mask> -> <gate_ip>/<mask> proxy port <port> <port>/tcp
+ */
+ KMALLOCS(newarray, char *, aps->aps_psiz + sizeof(*ipn));
+ if (newarray == NULL) {
+ return -1;
+ }
+ ipn = (ipnat_t *)&newarray[aps->aps_psiz];
+ bcopy(nat->nat_ptr, ipn, sizeof(ipnat_t));
+ strncpy(ipn->in_plabel, "h245", APR_LABELLEN);
+
+ ipn->in_inip = nat->nat_inip.s_addr;
+ ipn->in_inmsk = 0xffffffff;
+ ipn->in_dport = htons(port);
+ /*
+ * we got a problem here. we need to call nat_ioctl() to add
+ * the h245 proxy rule, but since we already hold (READ locked)
+ * the nat table rwlock (ipf_nat), if we go into nat_ioctl(),
+ * it will try to WRITE lock it. This will causing dead lock
+ * on RTP.
+ *
+ * The quick & dirty solution here is release the read lock,
+ * call nat_ioctl() and re-lock it.
+ * A (maybe better) solution is do a UPGRADE(), and instead
+ * of calling nat_ioctl(), we add the nat rule ourself.
+ */
+ RWLOCK_EXIT(&ipf_nat);
+ if (nat_ioctl((caddr_t)ipn, SIOCADNAT, FWRITE) == -1) {
+ READ_ENTER(&ipf_nat);
+ return -1;
+ }
+ READ_ENTER(&ipf_nat);
+ bcopy(aps->aps_data, newarray, aps->aps_psiz);
+ KFREES(aps->aps_data, aps->aps_psiz);
+ aps->aps_data = newarray;
+ aps->aps_psiz += sizeof(*ipn);
+ }
+ return 0;
+}
+
+
+int ippr_h245_init()
+{
+ return 0;
+}
+
+
+int ippr_h245_new(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+ aps->aps_data = NULL;
+ aps->aps_psiz = 0;
+ return 0;
+}
+
+
+int ippr_h245_out(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+ int ipaddr, off, datlen;
+ u_short port;
+ unsigned char *data;
+ tcphdr_t *tcp;
+
+ tcp = (tcphdr_t *)fin->fin_dp;
+ ipaddr = nat->nat_inip.s_addr;
+ data = (unsigned char *)tcp + (tcp->th_off << 2);
+ datlen = ip->ip_len - fin->fin_hlen - (tcp->th_off << 2);
+ if (find_port(ipaddr, data, datlen, &off, &port) == 0) {
+ fr_info_t fi;
+ nat_t *ipn;
+
+/* port = htons(port); */
+ ipn = nat_outlookup(fin->fin_ifp, IPN_UDP, IPPROTO_UDP,
+ ip->ip_src, ip->ip_dst, 1);
+ if (ipn == NULL) {
+ struct ip newip;
+ struct udphdr udp;
+
+ bcopy(ip, &newip, sizeof(newip));
+ newip.ip_len = fin->fin_hlen + sizeof(udp);
+ newip.ip_p = IPPROTO_UDP;
+ newip.ip_src = nat->nat_inip;
+
+ bzero(&udp, sizeof(udp));
+ udp.uh_sport = port;
+
+ bcopy(fin, &fi, sizeof(fi));
+ fi.fin_fi.fi_p = IPPROTO_UDP;
+ fi.fin_data[0] = port;
+ fi.fin_data[1] = 0;
+ fi.fin_dp = (char *)&udp;
+
+ ipn = nat_new(&fi, &newip, nat->nat_ptr, NULL,
+ IPN_UDP|FI_W_DPORT, NAT_OUTBOUND);
+ if (ipn != NULL) {
+ ipn->nat_ptr->in_hits++;
+#ifdef IPFILTER_LOG
+ nat_log(ipn, (u_int)(nat->nat_ptr->in_redir));
+#endif
+ *(int *)(data + off) = ip->ip_src.s_addr;
+ *(short *)(data + off + 4) = ipn->nat_outport;
+ }
+ }
+ }
+ return 0;
+}
+
+
+int ippr_h245_in(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+ return 0;
+}
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