539 lines
11 KiB
C
539 lines
11 KiB
C
/*
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* Copyright (C) 1998 by Darren Reed & Guido van Rooij.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and due credit is given
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* to the original author and the contributors.
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*/
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#if !defined(lint)
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/*static const char rcsid[] = "@(#)$Id: ip_auth.c,v 2.1.2.1 1999/09/28 11:44:04 darrenr Exp $";*/
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static const char rcsid[] = "@(#)$FreeBSD$";
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#endif
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#include <sys/errno.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/file.h>
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#if !defined(_KERNEL) && !defined(KERNEL)
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# include <stdio.h>
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# include <stdlib.h>
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# include <string.h>
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#endif
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#if defined(KERNEL) && (__FreeBSD_version >= 220000)
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# include <sys/filio.h>
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# include <sys/fcntl.h>
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#else
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# include <sys/ioctl.h>
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#endif
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#include <sys/uio.h>
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#ifndef linux
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# include <sys/protosw.h>
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#endif
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#include <sys/socket.h>
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#if defined(_KERNEL) && !defined(linux)
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# include <sys/systm.h>
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#endif
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#if !defined(__SVR4) && !defined(__svr4__)
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# ifndef linux
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# include <sys/mbuf.h>
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# endif
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#else
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# include <sys/filio.h>
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# include <sys/byteorder.h>
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# ifdef _KERNEL
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# include <sys/dditypes.h>
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# endif
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# include <sys/stream.h>
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# include <sys/kmem.h>
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#endif
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#if _BSDI_VERSION >= 199802
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# include <sys/queue.h>
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#endif
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#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(bsdi)
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# include <machine/cpu.h>
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#endif
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#include <net/if.h>
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#ifdef sun
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# include <net/af.h>
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#endif
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#ifndef KERNEL
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# define KERNEL
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# define NOT_KERNEL
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#endif
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#ifndef linux
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# include <netinet/ip_var.h>
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#endif
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#ifdef NOT_KERNEL
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# undef KERNEL
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#endif
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#ifdef __sgi
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# ifdef IFF_DRVRLOCK /* IRIX6 */
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# include <sys/hashing.h>
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# endif
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#endif
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#include <netinet/tcp.h>
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#if defined(__sgi) && !defined(IFF_DRVRLOCK) /* IRIX < 6 */
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extern struct ifqueue ipintrq; /* ip packet input queue */
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#else
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# ifndef linux
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# if __FreeBSD_version >= 300000
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# include <net/if_var.h>
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# endif
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# include <netinet/in_var.h>
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# include <netinet/tcp_fsm.h>
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# endif
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#endif
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#include <netinet/udp.h>
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#include <netinet/ip_icmp.h>
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#include "netinet/ip_compat.h"
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#include <netinet/tcpip.h>
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#include "netinet/ip_fil.h"
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#include "netinet/ip_auth.h"
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#if !SOLARIS && !defined(linux)
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# include <net/netisr.h>
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# ifdef __FreeBSD__
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# include <machine/cpufunc.h>
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# endif
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#endif
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#if (__FreeBSD_version >= 300000)
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# include <sys/malloc.h>
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# if (defined(_KERNEL) || defined(KERNEL)) && !defined(IPFILTER_LKM)
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# include <sys/libkern.h>
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# include <sys/systm.h>
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# endif
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#endif
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#if (SOLARIS || defined(__sgi)) && defined(_KERNEL)
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extern KRWLOCK_T ipf_auth;
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extern kmutex_t ipf_authmx;
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# if SOLARIS
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extern kcondvar_t ipfauthwait;
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# endif
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#endif
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#ifdef linux
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static struct wait_queue *ipfauthwait = NULL;
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#endif
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int fr_authsize = FR_NUMAUTH;
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int fr_authused = 0;
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int fr_defaultauthage = 600;
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fr_authstat_t fr_authstats;
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static frauth_t fr_auth[FR_NUMAUTH];
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mb_t *fr_authpkts[FR_NUMAUTH];
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static int fr_authstart = 0, fr_authend = 0, fr_authnext = 0;
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static frauthent_t *fae_list = NULL;
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frentry_t *ipauth = NULL;
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/*
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* Check if a packet has authorization. If the packet is found to match an
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* authorization result and that would result in a feedback loop (i.e. it
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* will end up returning FR_AUTH) then return FR_BLOCK instead.
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*/
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u_32_t fr_checkauth(ip, fin)
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ip_t *ip;
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fr_info_t *fin;
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{
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u_short id = ip->ip_id;
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u_32_t pass;
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int i;
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READ_ENTER(&ipf_auth);
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for (i = fr_authstart; i != fr_authend; ) {
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/*
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* index becomes -2 only after an SIOCAUTHW. Check this in
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* case the same packet gets sent again and it hasn't yet been
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* auth'd.
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*/
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if ((fr_auth[i].fra_index == -2) &&
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(id == fr_auth[i].fra_info.fin_id) &&
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!bcmp((char *)fin,(char *)&fr_auth[i].fra_info,FI_CSIZE)) {
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/*
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* Avoid feedback loop.
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*/
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if (!(pass = fr_auth[i].fra_pass) || (pass & FR_AUTH))
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pass = FR_BLOCK;
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RWLOCK_EXIT(&ipf_auth);
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WRITE_ENTER(&ipf_auth);
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fr_authstats.fas_hits++;
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fr_auth[i].fra_index = -1;
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fr_authused--;
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if (i == fr_authstart) {
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while (fr_auth[i].fra_index == -1) {
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i++;
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if (i == FR_NUMAUTH)
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i = 0;
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fr_authstart = i;
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if (i == fr_authend)
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break;
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}
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if (fr_authstart == fr_authend) {
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fr_authnext = 0;
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fr_authstart = fr_authend = 0;
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}
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}
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RWLOCK_EXIT(&ipf_auth);
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return pass;
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}
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i++;
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if (i == FR_NUMAUTH)
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i = 0;
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}
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fr_authstats.fas_miss++;
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RWLOCK_EXIT(&ipf_auth);
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return 0;
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}
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/*
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* Check if we have room in the auth array to hold details for another packet.
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* If we do, store it and wake up any user programs which are waiting to
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* hear about these events.
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*/
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int fr_newauth(m, fin, ip
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#if defined(_KERNEL) && SOLARIS
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, qif)
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qif_t *qif;
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#else
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)
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#endif
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mb_t *m;
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fr_info_t *fin;
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ip_t *ip;
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{
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int i;
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WRITE_ENTER(&ipf_auth);
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if (fr_authstart > fr_authend) {
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fr_authstats.fas_nospace++;
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RWLOCK_EXIT(&ipf_auth);
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return 0;
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} else {
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if ((fr_authstart == 0) && (fr_authend == FR_NUMAUTH - 1)) {
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fr_authstats.fas_nospace++;
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RWLOCK_EXIT(&ipf_auth);
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return 0;
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}
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}
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fr_authstats.fas_added++;
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fr_authused++;
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i = fr_authend++;
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if (fr_authend == FR_NUMAUTH)
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fr_authend = 0;
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RWLOCK_EXIT(&ipf_auth);
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fr_auth[i].fra_index = i;
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fr_auth[i].fra_pass = 0;
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fr_auth[i].fra_age = fr_defaultauthage;
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bcopy((char *)fin, (char *)&fr_auth[i].fra_info, sizeof(*fin));
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#if !defined(sparc) && !defined(m68k)
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/*
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* No need to copyback here as we want to undo the changes, not keep
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* them.
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*/
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# if SOLARIS && defined(_KERNEL)
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if (ip == (ip_t *)m->b_rptr)
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# endif
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{
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register u_short bo;
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bo = ip->ip_len;
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ip->ip_len = htons(bo);
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# if !SOLARIS /* 4.4BSD converts this ip_input.c, but I don't in solaris.c */
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bo = ip->ip_id;
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ip->ip_id = htons(bo);
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# endif
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bo = ip->ip_off;
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ip->ip_off = htons(bo);
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}
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#endif
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#if SOLARIS && defined(_KERNEL)
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m->b_rptr -= qif->qf_off;
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fr_authpkts[i] = *(mblk_t **)fin->fin_mp;
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fr_auth[i].fra_q = qif->qf_q;
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cv_signal(&ipfauthwait);
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#else
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fr_authpkts[i] = m;
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# if defined(linux) && defined(_KERNEL)
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wake_up_interruptible(&ipfauthwait);
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# else
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WAKEUP(&fr_authnext);
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# endif
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#endif
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return 1;
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}
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int fr_auth_ioctl(data, cmd, fr, frptr)
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caddr_t data;
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#if defined(__NetBSD__) || defined(__OpenBSD__) || (FreeBSD_version >= 300003)
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u_long cmd;
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#else
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int cmd;
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#endif
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frentry_t *fr, **frptr;
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{
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mb_t *m;
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#if defined(_KERNEL)
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# if !SOLARIS
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struct ifqueue *ifq;
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int s;
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# endif
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#endif
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frauth_t auth, *au = &auth;
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frauthent_t *fae, **faep;
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int i, error = 0;
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switch (cmd)
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{
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case SIOCINIFR :
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case SIOCRMIFR :
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case SIOCADIFR :
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error = EINVAL;
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break;
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case SIOCINAFR :
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case SIOCRMAFR :
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case SIOCADAFR :
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for (faep = &fae_list; (fae = *faep); )
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if (&fae->fae_fr == fr)
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break;
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else
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faep = &fae->fae_next;
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if (cmd == SIOCRMAFR) {
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if (!fae)
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error = ESRCH;
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else {
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WRITE_ENTER(&ipf_auth);
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*faep = fae->fae_next;
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*frptr = fr->fr_next;
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RWLOCK_EXIT(&ipf_auth);
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KFREE(fae);
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}
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} else {
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KMALLOC(fae, frauthent_t *);
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if (fae != NULL) {
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IRCOPY((char *)data, (char *)&fae->fae_fr,
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sizeof(fae->fae_fr));
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WRITE_ENTER(&ipf_auth);
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fae->fae_age = fr_defaultauthage;
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fae->fae_fr.fr_hits = 0;
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fae->fae_fr.fr_next = *frptr;
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*frptr = &fae->fae_fr;
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fae->fae_next = *faep;
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*faep = fae;
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ipauth = &fae_list->fae_fr;
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RWLOCK_EXIT(&ipf_auth);
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} else
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error = ENOMEM;
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}
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break;
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case SIOCATHST:
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READ_ENTER(&ipf_auth);
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fr_authstats.fas_faelist = fae_list;
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RWLOCK_EXIT(&ipf_auth);
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IWCOPY((char *)&fr_authstats, data, sizeof(fr_authstats));
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break;
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case SIOCAUTHW:
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fr_authioctlloop:
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READ_ENTER(&ipf_auth);
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if ((fr_authnext != fr_authend) && fr_authpkts[fr_authnext]) {
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IWCOPY((char *)&fr_auth[fr_authnext], data,
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sizeof(fr_info_t));
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RWLOCK_EXIT(&ipf_auth);
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WRITE_ENTER(&ipf_auth);
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fr_authnext++;
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if (fr_authnext == FR_NUMAUTH)
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fr_authnext = 0;
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RWLOCK_EXIT(&ipf_auth);
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return 0;
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}
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#ifdef _KERNEL
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# if SOLARIS
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mutex_enter(&ipf_authmx);
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if (!cv_wait_sig(&ipfauthwait, &ipf_authmx)) {
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mutex_exit(&ipf_authmx);
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return EINTR;
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}
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mutex_exit(&ipf_authmx);
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# else
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# ifdef linux
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interruptible_sleep_on(&ipfauthwait);
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if (current->signal & ~current->blocked)
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error = -EINTR;
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# else
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error = SLEEP(&fr_authnext, "fr_authnext");
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# endif
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# endif
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#endif
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RWLOCK_EXIT(&ipf_auth);
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if (!error)
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goto fr_authioctlloop;
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break;
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case SIOCAUTHR:
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IRCOPY(data, (caddr_t)&auth, sizeof(auth));
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WRITE_ENTER(&ipf_auth);
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i = au->fra_index;
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if ((i < 0) || (i > FR_NUMAUTH) ||
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(fr_auth[i].fra_info.fin_id != au->fra_info.fin_id)) {
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RWLOCK_EXIT(&ipf_auth);
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return EINVAL;
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}
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m = fr_authpkts[i];
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fr_auth[i].fra_index = -2;
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fr_auth[i].fra_pass = au->fra_pass;
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fr_authpkts[i] = NULL;
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#ifdef _KERNEL
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RWLOCK_EXIT(&ipf_auth);
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SPL_NET(s);
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# ifndef linux
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if (m && au->fra_info.fin_out) {
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# if SOLARIS
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error = fr_qout(fr_auth[i].fra_q, m);
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# else /* SOLARIS */
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# if _BSDI_VERSION >= 199802
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error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL,
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NULL);
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# else
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error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL);
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# endif
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# endif /* SOLARIS */
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if (error)
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fr_authstats.fas_sendfail++;
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else
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fr_authstats.fas_sendok++;
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} else if (m) {
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# if SOLARIS
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error = fr_qin(fr_auth[i].fra_q, m);
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# else /* SOLARIS */
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ifq = &ipintrq;
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if (IF_QFULL(ifq)) {
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IF_DROP(ifq);
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m_freem(m);
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error = ENOBUFS;
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} else {
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IF_ENQUEUE(ifq, m);
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schednetisr(NETISR_IP);
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}
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# endif /* SOLARIS */
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if (error)
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fr_authstats.fas_quefail++;
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else
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fr_authstats.fas_queok++;
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} else
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error = EINVAL;
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# endif
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# if SOLARIS
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if (error)
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error = EINVAL;
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# else
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/*
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* If we experience an error which will result in the packet
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* not being processed, make sure we advance to the next one.
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*/
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if (error == ENOBUFS) {
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fr_authused--;
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fr_auth[i].fra_index = -1;
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fr_auth[i].fra_pass = 0;
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if (i == fr_authstart) {
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while (fr_auth[i].fra_index == -1) {
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i++;
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if (i == FR_NUMAUTH)
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i = 0;
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fr_authstart = i;
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if (i == fr_authend)
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break;
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}
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if (fr_authstart == fr_authend) {
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fr_authnext = 0;
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fr_authstart = fr_authend = 0;
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}
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}
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}
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# endif
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SPL_X(s);
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#endif /* _KERNEL */
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break;
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default :
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error = EINVAL;
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break;
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}
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return error;
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}
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#ifdef _KERNEL
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/*
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* Free all network buffer memory used to keep saved packets.
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*/
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void fr_authunload()
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{
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register int i;
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register frauthent_t *fae, **faep;
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mb_t *m;
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WRITE_ENTER(&ipf_auth);
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for (i = 0; i < FR_NUMAUTH; i++) {
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if ((m = fr_authpkts[i])) {
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FREE_MB_T(m);
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fr_authpkts[i] = NULL;
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fr_auth[i].fra_index = -1;
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}
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}
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for (faep = &fae_list; (fae = *faep); ) {
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*faep = fae->fae_next;
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KFREE(fae);
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}
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ipauth = NULL;
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RWLOCK_EXIT(&ipf_auth);
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}
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/*
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* Slowly expire held auth records. Timeouts are set
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* in expectation of this being called twice per second.
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*/
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void fr_authexpire()
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{
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register int i;
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register frauth_t *fra;
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register frauthent_t *fae, **faep;
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mb_t *m;
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#if !SOLARIS
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int s;
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#endif
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SPL_NET(s);
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WRITE_ENTER(&ipf_auth);
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for (i = 0, fra = fr_auth; i < FR_NUMAUTH; i++, fra++) {
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if ((!--fra->fra_age) && (m = fr_authpkts[i])) {
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FREE_MB_T(m);
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fr_authpkts[i] = NULL;
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fr_auth[i].fra_index = -1;
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|
fr_authstats.fas_expire++;
|
|
fr_authused--;
|
|
}
|
|
}
|
|
|
|
for (faep = &fae_list; (fae = *faep); ) {
|
|
if (!--fae->fae_age) {
|
|
*faep = fae->fae_next;
|
|
KFREE(fae);
|
|
fr_authstats.fas_expire++;
|
|
} else
|
|
faep = &fae->fae_next;
|
|
}
|
|
ipauth = &fae_list->fae_fr;
|
|
RWLOCK_EXIT(&ipf_auth);
|
|
SPL_X(s);
|
|
}
|
|
#endif
|