476 lines
10 KiB
C
476 lines
10 KiB
C
/* $NetBSD: ip_log.c,v 1.16 2002/01/24 08:23:13 martti Exp $ */
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/*
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* Copyright (C) 1997-2001 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 2.5.2.9 2001/10/30 16:48:08 darrenr Exp
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ip_log.c,v 1.16 2002/01/24 08:23:13 martti Exp $");
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#include <sys/param.h>
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#include <sys/proc.h>
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#if defined(KERNEL) && !defined(_KERNEL)
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# define _KERNEL
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#endif
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#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
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!defined(_LKM)
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# include "opt_ipfilter_log.h"
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#endif
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#ifdef __FreeBSD__
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# if defined(_KERNEL) && !defined(IPFILTER_LKM)
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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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# ifdef KLD_MODULE
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# ifndef __FreeBSD_cc_version
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# include <osreldate.h>
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# else
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# if __FreeBSD_cc_version < 430000
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# include <osreldate.h>
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# endif
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# endif
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# endif
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# endif
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#endif
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#ifdef IPFILTER_LOG
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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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# 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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# 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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# 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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# endif
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# include <sys/uio.h>
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# if !SOLARIS
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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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# 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
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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/protosw.h>
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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(__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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# include <netinet/ip_var.h>
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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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# if (__FreeBSD_version >= 300000)
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# include <sys/malloc.h>
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# endif
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# if SOLARIS || defined(__sgi)
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extern kmutex_t ipl_mutex;
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# if SOLARIS
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extern kcondvar_t iplwait;
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# endif
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# endif
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iplog_t **iplh[IPL_LOGMAX+1], *iplt[IPL_LOGMAX+1], *ipll[IPL_LOGMAX+1];
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size_t iplused[IPL_LOGMAX+1];
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static fr_info_t iplcrc[IPL_LOGMAX+1];
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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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void ipflog_init()
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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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}
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}
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/*
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* ipflog
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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(flags, ip, fin, m)
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u_int flags;
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ip_t *ip;
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fr_info_t *fin;
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mb_t *m;
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{
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ipflog_t ipfl;
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size_t mlen, hlen;
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size_t sizes[2];
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void *ptrs[2];
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int types[2];
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u_char p;
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# if SOLARIS
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ill_t *ifp = fin->fin_ifp;
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# else
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struct ifnet *ifp = fin->fin_ifp;
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# endif
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/*
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* calculate header size.
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*/
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hlen = fin->fin_hlen;
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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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}
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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
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ipfl.fl_unit = (u_char)ifp->ill_ppa;
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bcopy(ifp->ill_name, ipfl.fl_ifname,
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MIN(ifp->ill_name_length, sizeof(ipfl.fl_ifname)));
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mlen = (flags & FR_LOGBODY) ? MIN(msgdsize(m) - hlen, 128) : 0;
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# else
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# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \
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(defined(OpenBSD) && (OpenBSD >= 199603))
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strncpy(ipfl.fl_ifname, ifp->if_xname, IFNAMSIZ);
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# else
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ipfl.fl_unit = (u_char)ifp->if_unit;
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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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# endif
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mlen = (flags & FR_LOGBODY) ? MIN(fin->fin_plen - hlen, 128) : 0;
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# endif
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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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ipfl.fl_group = fin->fin_group;
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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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else
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ipfl.fl_loglevel = 0xffff;
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ipfl.fl_flags = flags;
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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 SOLARIS
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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 (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] = 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
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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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* ipllog
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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, s;
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iplog_t *ipl;
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size_t len;
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int i;
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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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MUTEX_ENTER(&ipl_mutex);
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if (fin != NULL) {
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if ((ipll[dev] != NULL) &&
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bcmp((char *)fin, (char *)&iplcrc[dev], FI_CSIZE) == 0) {
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ipll[dev]->ipl_count++;
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MUTEX_EXIT(&ipl_mutex);
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return 1;
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}
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bcopy((char *)fin, (char *)&iplcrc[dev], FI_CSIZE);
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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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* 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)
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return 0;
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MUTEX_ENTER(&ipl_mutex);
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if ((iplused[dev] + len) > IPLLOGSIZE) {
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MUTEX_EXIT(&ipl_mutex);
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KFREES(buf, len);
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return 0;
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}
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iplused[dev] += len;
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MUTEX_EXIT(&ipl_mutex);
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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;
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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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# if SOLARIS || defined(sun)
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uniqtime((struct timeval *)&ipl->ipl_sec);
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# else
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# if BSD >= 199306 || defined(__FreeBSD__) || defined(__sgi)
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microtime((struct timeval *)&ipl->ipl_sec);
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# endif
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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, s = buf + sizeof(*ipl); i < cnt; i++) {
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if (types[i] == 0)
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bcopy(items[i], s, itemsz[i]);
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else if (types[i] == 1) {
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# if SOLARIS
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copyout_mblk(items[i], 0, itemsz[i], s);
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# else
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m_copydata(items[i], 0, itemsz[i], s);
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# endif
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}
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s += itemsz[i];
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}
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MUTEX_ENTER(&ipl_mutex);
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ipll[dev] = ipl;
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*iplh[dev] = ipl;
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iplh[dev] = &ipl->ipl_next;
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# if SOLARIS
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cv_signal(&iplwait);
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mutex_exit(&ipl_mutex);
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# else
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MUTEX_EXIT(&ipl_mutex);
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wakeup(&iplh[dev]);
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# endif
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return 1;
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}
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int ipflog_read(unit, uio)
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minor_t unit;
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struct uio *uio;
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{
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size_t dlen, copied;
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int error = 0;
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iplog_t *ipl;
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# if defined(_KERNEL) && !SOLARIS
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int s;
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# endif
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/*
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* Sanity checks. Make sure the minor # is valid and we're copying
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* a valid chunk of data.
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*/
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if (IPL_LOGMAX < unit)
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return ENXIO;
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if (!uio->uio_resid)
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return 0;
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if (uio->uio_resid < sizeof(iplog_t))
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return EINVAL;
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/*
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* Lock the log so we can snapshot the variables. Wait for a signal
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* if the log is empty.
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*/
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SPL_NET(s);
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MUTEX_ENTER(&ipl_mutex);
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while (!iplused[unit] || !iplt[unit]) {
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# if SOLARIS && defined(_KERNEL)
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if (!cv_wait_sig(&iplwait, &ipl_mutex)) {
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MUTEX_EXIT(&ipl_mutex);
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return EINTR;
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}
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# else
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MUTEX_EXIT(&ipl_mutex);
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error = SLEEP(&iplh[unit], "ipl sleep");
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if (error) {
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SPL_X(s);
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return error;
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}
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MUTEX_ENTER(&ipl_mutex);
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# endif /* SOLARIS */
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}
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# if BSD >= 199306 || defined(__FreeBSD__)
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uio->uio_rw = UIO_READ;
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# endif
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for (copied = 0; (ipl = iplt[unit]); copied += dlen) {
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dlen = ipl->ipl_dsize;
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if (dlen > uio->uio_resid)
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break;
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/*
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* Don't hold the mutex over the uiomove call.
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*/
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iplt[unit] = ipl->ipl_next;
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iplused[unit] -= dlen;
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MUTEX_EXIT(&ipl_mutex);
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error = UIOMOVE((caddr_t)ipl, dlen, UIO_READ, uio);
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MUTEX_ENTER(&ipl_mutex);
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if (error) {
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ipl->ipl_next = iplt[unit];
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iplt[unit] = ipl;
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iplused[unit] += dlen;
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break;
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}
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KFREES((caddr_t)ipl, dlen);
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}
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if (!iplt[unit]) {
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iplused[unit] = 0;
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iplh[unit] = &iplt[unit];
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ipll[unit] = NULL;
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}
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MUTEX_EXIT(&ipl_mutex);
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SPL_X(s);
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return error;
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}
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int ipflog_clear(unit)
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minor_t unit;
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{
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iplog_t *ipl;
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int used;
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MUTEX_ENTER(&ipl_mutex);
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while ((ipl = iplt[unit])) {
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iplt[unit] = ipl->ipl_next;
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KFREES((caddr_t)ipl, ipl->ipl_dsize);
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}
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iplh[unit] = &iplt[unit];
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ipll[unit] = NULL;
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used = iplused[unit];
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iplused[unit] = 0;
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bzero((char *)&iplcrc[unit], FI_CSIZE);
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MUTEX_EXIT(&ipl_mutex);
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return used;
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}
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#endif /* IPFILTER_LOG */
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