675 lines
18 KiB
C
675 lines
18 KiB
C
/* $NetBSD$ */
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/*
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* Copyright (C) 1997-2003 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*
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* Id: ip_log.c,v 2.75.2.6 2004/10/16 07:59:27 darrenr Exp
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*/
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#include <sys/param.h>
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#if defined(KERNEL) || defined(_KERNEL)
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# undef KERNEL
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# undef _KERNEL
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# define KERNEL 1
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# define _KERNEL 1
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#endif
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#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
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defined(_KERNEL)
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# include "opt_ipfilter_log.h"
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#endif
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#if defined(__FreeBSD__) && !defined(IPFILTER_LKM)
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# if defined(_KERNEL)
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# if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
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# include "opt_ipfilter.h"
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# endif
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# else
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# include <osreldate.h>
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# endif
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#endif
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#ifndef SOLARIS
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# define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
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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/file.h>
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#ifndef _KERNEL
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# include <stdio.h>
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# include <string.h>
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# include <stdlib.h>
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# include <ctype.h>
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# define _KERNEL
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# define KERNEL
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# ifdef __OpenBSD__
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struct file;
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# endif
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# include <sys/uio.h>
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# undef _KERNEL
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# undef KERNEL
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#endif
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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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#include <sys/time.h>
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#if defined(_KERNEL)
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# include <sys/systm.h>
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# if defined(NetBSD) && (__NetBSD_Version__ >= 104000000)
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# include <sys/proc.h>
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# endif
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#endif /* _KERNEL */
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#if !SOLARIS && !defined(__hpux) && !defined(linux)
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# if (NetBSD > 199609) || (OpenBSD > 199603) || (__FreeBSD_version >= 300000)
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# include <sys/dirent.h>
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# else
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# include <sys/dir.h>
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# endif
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# include <sys/mbuf.h>
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#else
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# if !defined(__hpux) && defined(_KERNEL)
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# include <sys/filio.h>
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# include <sys/cred.h>
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# include <sys/ddi.h>
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# include <sys/sunddi.h>
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# include <sys/ksynch.h>
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# include <sys/kmem.h>
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# include <sys/mkdev.h>
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# include <sys/dditypes.h>
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# include <sys/cmn_err.h>
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# endif /* !__hpux */
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#endif /* !SOLARIS && !__hpux */
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#if !defined(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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#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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#if __FreeBSD_version >= 300000
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# include <net/if_var.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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#ifdef __sgi
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# include <sys/ddi.h>
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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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#if !defined(__hpux) && !defined(linux) && \
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!(defined(__sgi) && !defined(IFF_DRVRLOCK)) /*IRIX<6*/
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# include <netinet/in_var.h>
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#endif
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/ip_icmp.h>
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#ifdef USE_INET6
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# include <netinet/icmp6.h>
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#endif
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#if !defined(linux)
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# include <netinet/ip_var.h>
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#endif
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#ifndef _KERNEL
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# include <syslog.h>
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#endif
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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_nat.h"
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#include "netinet/ip_frag.h"
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#include "netinet/ip_state.h"
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#include "netinet/ip_auth.h"
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#if (__FreeBSD_version >= 300000) || defined(__NetBSD__)
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# include <sys/malloc.h>
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#endif
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/* END OF INCLUDES */
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#ifdef IPFILTER_LOG
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# if defined(IPL_SELECT)
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# include <machine/sys/user.h>
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# include <sys/kthread_iface.h>
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# define READ_COLLISION 0x001
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iplog_select_t iplog_ss[IPL_LOGMAX+1];
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extern int selwait;
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# endif /* IPL_SELECT */
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# if defined(linux) && defined(_KERNEL)
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wait_queue_head_t iplh_linux[IPL_LOGSIZE];
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# endif
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# if SOLARIS
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extern kcondvar_t iplwait;
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# endif
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iplog_t **iplh[IPL_LOGSIZE], *iplt[IPL_LOGSIZE], *ipll[IPL_LOGSIZE];
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int iplused[IPL_LOGSIZE];
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static fr_info_t iplcrc[IPL_LOGSIZE];
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int ipl_suppress = 1;
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int ipl_buffer_sz;
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int ipl_logmax = IPL_LOGMAX;
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int ipl_logall = 0;
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int ipl_log_init = 0;
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int ipl_logsize = IPFILTER_LOGSIZE;
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int ipl_magic[IPL_LOGSIZE] = { IPL_MAGIC, IPL_MAGIC_NAT, IPL_MAGIC_STATE,
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IPL_MAGIC, IPL_MAGIC, IPL_MAGIC,
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IPL_MAGIC, IPL_MAGIC };
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/* ------------------------------------------------------------------------ */
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/* Function: fr_loginit */
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/* Returns: int - 0 == success (always returned) */
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/* Parameters: Nil */
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/* */
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/* Initialise log buffers & pointers. Also iniialised the CRC to a local */
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/* secret for use in calculating the "last log checksum". */
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/* ------------------------------------------------------------------------ */
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int fr_loginit()
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{
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int i;
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for (i = IPL_LOGMAX; i >= 0; i--) {
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iplt[i] = NULL;
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ipll[i] = NULL;
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iplh[i] = &iplt[i];
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iplused[i] = 0;
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bzero((char *)&iplcrc[i], sizeof(iplcrc[i]));
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# ifdef IPL_SELECT
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iplog_ss[i].read_waiter = 0;
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iplog_ss[i].state = 0;
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# endif
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# if defined(linux) && defined(_KERNEL)
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init_waitqueue_head(iplh_linux + i);
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# endif
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}
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# if SOLARIS && defined(_KERNEL)
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cv_init(&iplwait, "ipl condvar", CV_DRIVER, NULL);
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# endif
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MUTEX_INIT(&ipl_mutex, "ipf log mutex");
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ipl_log_init = 1;
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: fr_logunload */
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/* Returns: Nil */
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/* Parameters: Nil */
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/* */
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/* Clean up any log data that has accumulated without being read. */
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/* ------------------------------------------------------------------------ */
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void fr_logunload()
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{
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int i;
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if (ipl_log_init == 0)
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return;
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for (i = IPL_LOGMAX; i >= 0; i--)
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(void) ipflog_clear(i);
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# if SOLARIS && defined(_KERNEL)
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cv_destroy(&iplwait);
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# endif
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MUTEX_DESTROY(&ipl_mutex);
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ipl_log_init = 0;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipflog */
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/* Returns: int - 0 == success, -1 == failure */
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/* Parameters: fin(I) - pointer to packet information */
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/* flags(I) - flags from filter rules */
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/* */
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/* Create a log record for a packet given that it has been triggered by a */
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/* rule (or the default setting). Calculate the transport protocol header */
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/* size using predetermined size of a couple of popular protocols and thus */
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/* how much data to copy into the log, including part of the data body if */
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/* requested. */
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/* ------------------------------------------------------------------------ */
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int ipflog(fin, flags)
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fr_info_t *fin;
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u_int flags;
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{
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register size_t hlen;
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int types[2], mlen;
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size_t sizes[2];
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void *ptrs[2];
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ipflog_t ipfl;
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u_char p;
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mb_t *m;
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# if (SOLARIS || defined(__hpux)) && defined(_KERNEL)
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qif_t *ifp;
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# else
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struct ifnet *ifp;
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# endif /* SOLARIS || __hpux */
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ipfl.fl_nattag.ipt_num[0] = 0;
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m = fin->fin_m;
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ifp = fin->fin_ifp;
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hlen = fin->fin_hlen;
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/*
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* calculate header size.
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*/
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if (fin->fin_off == 0) {
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p = fin->fin_fi.fi_p;
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if (p == IPPROTO_TCP)
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hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen);
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else if (p == IPPROTO_UDP)
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hlen += MIN(sizeof(udphdr_t), fin->fin_dlen);
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else if (p == IPPROTO_ICMP) {
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struct icmp *icmp;
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icmp = (struct icmp *)fin->fin_dp;
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/*
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* For ICMP, if the packet is an error packet, also
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* include the information about the packet which
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* caused the error.
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*/
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switch (icmp->icmp_type)
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{
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case ICMP_UNREACH :
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case ICMP_SOURCEQUENCH :
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case ICMP_REDIRECT :
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case ICMP_TIMXCEED :
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case ICMP_PARAMPROB :
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hlen += MIN(sizeof(struct icmp) + 8,
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fin->fin_dlen);
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break;
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default :
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hlen += MIN(sizeof(struct icmp),
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fin->fin_dlen);
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break;
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}
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}
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# ifdef USE_INET6
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else if (p == IPPROTO_ICMPV6) {
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struct icmp6_hdr *icmp;
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icmp = (struct icmp6_hdr *)fin->fin_dp;
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/*
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* For ICMPV6, if the packet is an error packet, also
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* include the information about the packet which
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* caused the error.
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*/
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if (icmp->icmp6_type < 128) {
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hlen += MIN(sizeof(struct icmp6_hdr) + 8,
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fin->fin_dlen);
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} else {
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hlen += MIN(sizeof(struct icmp6_hdr),
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fin->fin_dlen);
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}
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}
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# endif
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}
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/*
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* Get the interface number and name to which this packet is
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* currently associated.
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*/
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# if (SOLARIS || defined(__hpux)) && defined(_KERNEL)
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ipfl.fl_unit = (u_int)ifp->qf_ppa;
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COPYIFNAME(ifp, ipfl.fl_ifname);
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# else
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# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \
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(defined(OpenBSD) && (OpenBSD >= 199603)) || defined(linux) || \
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(defined(__FreeBSD__) && (__FreeBSD_version >= 501113))
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COPYIFNAME(ifp, ipfl.fl_ifname);
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# else
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ipfl.fl_unit = (u_int)ifp->if_unit;
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# if defined(_KERNEL)
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if ((ipfl.fl_ifname[0] = ifp->if_name[0]))
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if ((ipfl.fl_ifname[1] = ifp->if_name[1]))
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if ((ipfl.fl_ifname[2] = ifp->if_name[2]))
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ipfl.fl_ifname[3] = ifp->if_name[3];
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# else
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(void) strncpy(ipfl.fl_ifname, IFNAME(ifp), sizeof(ipfl.fl_ifname));
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ipfl.fl_ifname[sizeof(ipfl.fl_ifname) - 1] = '\0';
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# endif
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# endif
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# endif /* __hpux || SOLARIS */
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mlen = fin->fin_plen - hlen;
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if (!ipl_logall) {
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mlen = (flags & FR_LOGBODY) ? MIN(mlen, 128) : 0;
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} else if ((flags & FR_LOGBODY) == 0) {
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mlen = 0;
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}
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if (mlen < 0)
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mlen = 0;
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ipfl.fl_plen = (u_char)mlen;
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ipfl.fl_hlen = (u_char)hlen;
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ipfl.fl_rule = fin->fin_rule;
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(void) strncpy(ipfl.fl_group, fin->fin_group, FR_GROUPLEN);
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if (fin->fin_fr != NULL) {
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ipfl.fl_loglevel = fin->fin_fr->fr_loglevel;
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ipfl.fl_logtag = fin->fin_fr->fr_logtag;
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} else {
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ipfl.fl_loglevel = 0xffff;
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ipfl.fl_logtag = FR_NOLOGTAG;
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}
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if (fin->fin_nattag != NULL)
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bcopy(fin->fin_nattag, (void *)&ipfl.fl_nattag,
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sizeof(ipfl.fl_nattag));
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ipfl.fl_flags = flags;
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ipfl.fl_dir = fin->fin_out;
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ipfl.fl_lflags = fin->fin_flx;
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ptrs[0] = (void *)&ipfl;
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sizes[0] = sizeof(ipfl);
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types[0] = 0;
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# if defined(MENTAT) && defined(_KERNEL)
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/*
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* Are we copied from the mblk or an aligned array ?
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*/
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if (fin->fin_ip == (ip_t *)m->b_rptr) {
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ptrs[1] = m;
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sizes[1] = hlen + mlen;
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types[1] = 1;
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} else {
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ptrs[1] = fin->fin_ip;
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sizes[1] = hlen + mlen;
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types[1] = 0;
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}
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# else
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ptrs[1] = m;
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sizes[1] = hlen + mlen;
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types[1] = 1;
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# endif /* MENTAT */
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return ipllog(IPL_LOGIPF, fin, ptrs, sizes, types, 2);
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipllog */
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/* Returns: int - 0 == success, -1 == failure */
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/* Parameters: dev(I) - device that owns this log record */
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/* fin(I) - pointer to packet information */
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/* items(I) - array of pointers to log data */
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/* itemsz(I) - array of size of valid memory pointed to */
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/* types(I) - type of data pointed to by items pointers */
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/* cnt(I) - number of elements in arrays items/itemsz/types */
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/* */
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/* Takes an array of parameters and constructs one record to include the */
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/* miscellaneous packet information, as well as packet data, for reading */
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/* from the log device. */
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/* ------------------------------------------------------------------------ */
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int ipllog(dev, fin, items, itemsz, types, cnt)
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int dev;
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fr_info_t *fin;
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void **items;
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size_t *itemsz;
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int *types, cnt;
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{
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caddr_t buf, ptr;
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iplog_t *ipl;
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size_t len;
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int i;
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# if defined(_KERNEL) && !defined(MENTAT) && defined(USE_SPL)
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int s;
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# endif
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/*
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* Check to see if this log record has a CRC which matches the last
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* record logged. If it does, just up the count on the previous one
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* rather than create a new one.
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*/
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if (ipl_suppress) {
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MUTEX_ENTER(&ipl_mutex);
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if ((fin != NULL) && (fin->fin_off == 0)) {
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if ((ipll[dev] != NULL) &&
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bcmp((char *)fin, (char *)&iplcrc[dev],
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FI_LCSIZE) == 0) {
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ipll[dev]->ipl_count++;
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MUTEX_EXIT(&ipl_mutex);
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return 0;
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}
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bcopy((char *)fin, (char *)&iplcrc[dev], FI_LCSIZE);
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} else
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bzero((char *)&iplcrc[dev], FI_CSIZE);
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MUTEX_EXIT(&ipl_mutex);
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}
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/*
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* Get the total amount of data to be logged.
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*/
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for (i = 0, len = sizeof(iplog_t); i < cnt; i++)
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len += itemsz[i];
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/*
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* check that we have space to record this information and can
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* allocate that much.
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*/
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KMALLOCS(buf, caddr_t, len);
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if (buf == NULL)
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return -1;
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SPL_NET(s);
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MUTEX_ENTER(&ipl_mutex);
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if ((iplused[dev] + len) > ipl_logsize) {
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MUTEX_EXIT(&ipl_mutex);
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SPL_X(s);
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KFREES(buf, len);
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return -1;
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}
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iplused[dev] += len;
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MUTEX_EXIT(&ipl_mutex);
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SPL_X(s);
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/*
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* advance the log pointer to the next empty record and deduct the
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* amount of space we're going to use.
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*/
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ipl = (iplog_t *)buf;
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ipl->ipl_magic = ipl_magic[dev];
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ipl->ipl_count = 1;
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ipl->ipl_next = NULL;
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ipl->ipl_dsize = len;
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#ifdef _KERNEL
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GETKTIME(&ipl->ipl_sec);
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#else
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ipl->ipl_sec = 0;
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ipl->ipl_usec = 0;
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#endif
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/*
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* Loop through all the items to be logged, copying each one to the
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* buffer. Use bcopy for normal data or the mb_t copyout routine.
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*/
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for (i = 0, ptr = buf + sizeof(*ipl); i < cnt; i++) {
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if (types[i] == 0) {
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bcopy(items[i], ptr, itemsz[i]);
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} else if (types[i] == 1) {
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COPYDATA(items[i], 0, itemsz[i], ptr);
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}
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ptr += itemsz[i];
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}
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SPL_NET(s);
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MUTEX_ENTER(&ipl_mutex);
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ipll[dev] = ipl;
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*iplh[dev] = ipl;
|
|
iplh[dev] = &ipl->ipl_next;
|
|
|
|
/*
|
|
* Now that the log record has been completed and added to the queue,
|
|
* wake up any listeners who may want to read it.
|
|
*/
|
|
# if SOLARIS && defined(_KERNEL)
|
|
cv_signal(&iplwait);
|
|
MUTEX_EXIT(&ipl_mutex);
|
|
# else
|
|
MUTEX_EXIT(&ipl_mutex);
|
|
WAKEUP(iplh,dev);
|
|
# endif
|
|
SPL_X(s);
|
|
# ifdef IPL_SELECT
|
|
iplog_input_ready(dev);
|
|
# endif
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipflog_read */
|
|
/* Returns: int - 0 == success, else error value. */
|
|
/* Parameters: unit(I) - device we are reading from */
|
|
/* uio(O) - pointer to information about where to store data */
|
|
/* */
|
|
/* Called to handle a read on an IPFilter device. Returns only complete */
|
|
/* log messages - will not partially copy a log record out to userland. */
|
|
/* */
|
|
/* NOTE: This function will block and wait for a signal to return data if */
|
|
/* there is none present. Asynchronous I/O is not implemented. */
|
|
/* ------------------------------------------------------------------------ */
|
|
int ipflog_read(unit, uio)
|
|
minor_t unit;
|
|
struct uio *uio;
|
|
{
|
|
size_t dlen, copied;
|
|
int error = 0;
|
|
iplog_t *ipl;
|
|
# if defined(_KERNEL) && !defined(MENTAT) && defined(USE_SPL)
|
|
int s;
|
|
# endif
|
|
|
|
/*
|
|
* Sanity checks. Make sure the minor # is valid and we're copying
|
|
* a valid chunk of data.
|
|
*/
|
|
if (IPL_LOGMAX < unit)
|
|
return ENXIO;
|
|
if (uio->uio_resid == 0)
|
|
return 0;
|
|
if ((uio->uio_resid < sizeof(iplog_t)) ||
|
|
(uio->uio_resid > ipl_logsize))
|
|
return EINVAL;
|
|
|
|
/*
|
|
* Lock the log so we can snapshot the variables. Wait for a signal
|
|
* if the log is empty.
|
|
*/
|
|
SPL_NET(s);
|
|
MUTEX_ENTER(&ipl_mutex);
|
|
|
|
while (iplt[unit] == NULL) {
|
|
# if SOLARIS && defined(_KERNEL)
|
|
if (!cv_wait_sig(&iplwait, &ipl_mutex.ipf_lk)) {
|
|
MUTEX_EXIT(&ipl_mutex);
|
|
return EINTR;
|
|
}
|
|
# else
|
|
# if defined(__hpux) && defined(_KERNEL)
|
|
lock_t *l;
|
|
|
|
# ifdef IPL_SELECT
|
|
if (uio->uio_fpflags & (FNBLOCK|FNDELAY)) {
|
|
/* this is no blocking system call */
|
|
MUTEX_EXIT(&ipl_mutex);
|
|
return 0;
|
|
}
|
|
# endif
|
|
|
|
MUTEX_EXIT(&ipl_mutex);
|
|
l = get_sleep_lock(&iplh[unit]);
|
|
error = sleep(&iplh[unit], PZERO+1);
|
|
spinunlock(l);
|
|
# else
|
|
# if defined(__osf__) && defined(_KERNEL)
|
|
error = mpsleep(&iplh[unit], PSUSP|PCATCH, "iplread", 0,
|
|
&ipl_mutex, MS_LOCK_SIMPLE);
|
|
# else
|
|
MUTEX_EXIT(&ipl_mutex);
|
|
SPL_X(s);
|
|
error = SLEEP(unit + iplh, "ipl sleep");
|
|
# endif /* __osf__ */
|
|
# endif /* __hpux */
|
|
if (error)
|
|
return error;
|
|
SPL_NET(s);
|
|
MUTEX_ENTER(&ipl_mutex);
|
|
# endif /* SOLARIS */
|
|
}
|
|
|
|
# if (BSD >= 199101) || defined(__FreeBSD__) || defined(__osf__)
|
|
uio->uio_rw = UIO_READ;
|
|
# endif
|
|
|
|
for (copied = 0; (ipl = iplt[unit]) != NULL; copied += dlen) {
|
|
dlen = ipl->ipl_dsize;
|
|
if (dlen > uio->uio_resid)
|
|
break;
|
|
/*
|
|
* Don't hold the mutex over the uiomove call.
|
|
*/
|
|
iplt[unit] = ipl->ipl_next;
|
|
iplused[unit] -= dlen;
|
|
MUTEX_EXIT(&ipl_mutex);
|
|
SPL_X(s);
|
|
error = UIOMOVE((caddr_t)ipl, dlen, UIO_READ, uio);
|
|
if (error) {
|
|
SPL_NET(s);
|
|
MUTEX_ENTER(&ipl_mutex);
|
|
ipl->ipl_next = iplt[unit];
|
|
iplt[unit] = ipl;
|
|
iplused[unit] += dlen;
|
|
break;
|
|
}
|
|
MUTEX_ENTER(&ipl_mutex);
|
|
KFREES((caddr_t)ipl, dlen);
|
|
SPL_NET(s);
|
|
}
|
|
if (!iplt[unit]) {
|
|
iplused[unit] = 0;
|
|
iplh[unit] = &iplt[unit];
|
|
ipll[unit] = NULL;
|
|
}
|
|
|
|
MUTEX_EXIT(&ipl_mutex);
|
|
SPL_X(s);
|
|
return error;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipflog_clear */
|
|
/* Returns: int - number of log bytes cleared. */
|
|
/* Parameters: unit(I) - device we are reading from */
|
|
/* */
|
|
/* Deletes all queued up log records for a given output device. */
|
|
/* ------------------------------------------------------------------------ */
|
|
int ipflog_clear(unit)
|
|
minor_t unit;
|
|
{
|
|
iplog_t *ipl;
|
|
int used;
|
|
# if defined(_KERNEL) && !defined(MENTAT) && defined(USE_SPL)
|
|
int s;
|
|
# endif
|
|
|
|
SPL_NET(s);
|
|
MUTEX_ENTER(&ipl_mutex);
|
|
while ((ipl = iplt[unit]) != NULL) {
|
|
iplt[unit] = ipl->ipl_next;
|
|
KFREES((caddr_t)ipl, ipl->ipl_dsize);
|
|
}
|
|
iplh[unit] = &iplt[unit];
|
|
ipll[unit] = NULL;
|
|
used = iplused[unit];
|
|
iplused[unit] = 0;
|
|
bzero((char *)&iplcrc[unit], FI_CSIZE);
|
|
MUTEX_EXIT(&ipl_mutex);
|
|
SPL_X(s);
|
|
return used;
|
|
}
|
|
#endif /* IPFILTER_LOG */
|