bfc88dcbf7
Approved by: glebius (mentor) BSD Licensed by: Darren Reed <darrenr@reed.wattle.id.au> (author)
530 lines
11 KiB
C
530 lines
11 KiB
C
/* $FreeBSD$ */
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/*
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* Copyright (C) 2012 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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/conf.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/select.h>
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#if __FreeBSD_version >= 500000
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# include <sys/selinfo.h>
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#endif
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#include <net/if.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include "netinet/ipl.h"
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#include "netinet/ip_compat.h"
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#include "netinet/ip_fil.h"
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#include "netinet/ip_state.h"
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#include "netinet/ip_nat.h"
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#include "netinet/ip_auth.h"
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#include "netinet/ip_frag.h"
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#include "netinet/ip_sync.h"
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extern ipf_main_softc_t ipfmain;
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#if __FreeBSD_version >= 502116
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static struct cdev *ipf_devs[IPL_LOGSIZE];
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#else
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static dev_t ipf_devs[IPL_LOGSIZE];
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#endif
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#if 0
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static int sysctl_ipf_int ( SYSCTL_HANDLER_ARGS );
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#endif
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static int ipf_modload(void);
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static int ipf_modunload(void);
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#if (__FreeBSD_version >= 500024)
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# if (__FreeBSD_version >= 502116)
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static int ipfopen __P((struct cdev*, int, int, struct thread *));
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static int ipfclose __P((struct cdev*, int, int, struct thread *));
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# else
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static int ipfopen __P((dev_t, int, int, struct thread *));
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static int ipfclose __P((dev_t, int, int, struct thread *));
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# endif /* __FreeBSD_version >= 502116 */
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#else
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static int ipfopen __P((dev_t, int, int, struct proc *));
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static int ipfclose __P((dev_t, int, int, struct proc *));
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#endif
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#if (__FreeBSD_version >= 502116)
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static int ipfread __P((struct cdev*, struct uio *, int));
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static int ipfwrite __P((struct cdev*, struct uio *, int));
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#else
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static int ipfread __P((dev_t, struct uio *, int));
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static int ipfwrite __P((dev_t, struct uio *, int));
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#endif /* __FreeBSD_version >= 502116 */
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SYSCTL_DECL(_net_inet);
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#define SYSCTL_IPF(parent, nbr, name, access, ptr, val, descr) \
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SYSCTL_OID(parent, nbr, name, CTLTYPE_INT|access, \
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ptr, val, sysctl_ipf_int, "I", descr);
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#define CTLFLAG_OFF 0x00800000 /* IPFilter must be disabled */
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#define CTLFLAG_RWO (CTLFLAG_RW|CTLFLAG_OFF)
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SYSCTL_NODE(_net_inet, OID_AUTO, ipf, CTLFLAG_RW, 0, "IPF");
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#if 0
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_flags, CTLFLAG_RW, &ipf_flags, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, ipf_pass, CTLFLAG_RW, &ipf_pass, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_active, CTLFLAG_RD, &ipf_active, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcpidletimeout, CTLFLAG_RWO,
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&ipf_tcpidletimeout, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcphalfclosed, CTLFLAG_RWO,
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&ipf_tcphalfclosed, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcpclosewait, CTLFLAG_RWO,
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&ipf_tcpclosewait, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcplastack, CTLFLAG_RWO,
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&ipf_tcplastack, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcptimeout, CTLFLAG_RWO,
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&ipf_tcptimeout, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcpclosed, CTLFLAG_RWO,
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&ipf_tcpclosed, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_udptimeout, CTLFLAG_RWO,
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&ipf_udptimeout, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_udpacktimeout, CTLFLAG_RWO,
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&ipf_udpacktimeout, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_icmptimeout, CTLFLAG_RWO,
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&ipf_icmptimeout, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_defnatage, CTLFLAG_RWO,
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&ipf_nat_defage, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_ipfrttl, CTLFLAG_RW,
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&ipf_ipfrttl, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, ipf_running, CTLFLAG_RD,
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&ipf_running, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_statesize, CTLFLAG_RWO,
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&ipf_state_size, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_statemax, CTLFLAG_RWO,
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&ipf_state_max, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, ipf_nattable_sz, CTLFLAG_RWO,
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&ipf_nat_table_sz, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, ipf_natrules_sz, CTLFLAG_RWO,
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&ipf_nat_maprules_sz, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, ipf_rdrrules_sz, CTLFLAG_RWO,
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&ipf_nat_rdrrules_sz, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, ipf_hostmap_sz, CTLFLAG_RWO,
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&ipf_nat_hostmap_sz, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_authsize, CTLFLAG_RWO,
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&ipf_auth_size, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_authused, CTLFLAG_RD,
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&ipf_auth_used, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_defaultauthage, CTLFLAG_RW,
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&ipf_auth_defaultage, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_chksrc, CTLFLAG_RW, &ipf_chksrc, 0, "");
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SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_minttl, CTLFLAG_RW, &ipf_minttl, 0, "");
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#endif
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#define CDEV_MAJOR 79
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#include <sys/poll.h>
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#if __FreeBSD_version >= 500043
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# include <sys/select.h>
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static int ipfpoll(struct cdev *dev, int events, struct thread *td);
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static struct cdevsw ipf_cdevsw = {
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#if __FreeBSD_version >= 502103
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.d_version = D_VERSION,
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.d_flags = 0, /* D_NEEDGIANT - Should be SMP safe */
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#endif
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.d_open = ipfopen,
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.d_close = ipfclose,
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.d_read = ipfread,
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.d_write = ipfwrite,
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.d_ioctl = ipfioctl,
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.d_poll = ipfpoll,
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.d_name = "ipf",
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#if __FreeBSD_version < 600000
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.d_maj = CDEV_MAJOR,
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#endif
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};
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#else
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static int ipfpoll(dev_t dev, int events, struct proc *td);
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static struct cdevsw ipf_cdevsw = {
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/* open */ ipfopen,
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/* close */ ipfclose,
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/* read */ ipfread,
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/* write */ ipfwrite,
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/* ioctl */ ipfioctl,
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/* poll */ ipfpoll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "ipf",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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# if (__FreeBSD_version < 500043)
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/* bmaj */ -1,
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# endif
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# if (__FreeBSD_version >= 430000)
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/* kqfilter */ NULL
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# endif
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};
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#endif
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static char *ipf_devfiles[] = { IPL_NAME, IPNAT_NAME, IPSTATE_NAME, IPAUTH_NAME,
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IPSYNC_NAME, IPSCAN_NAME, IPLOOKUP_NAME, NULL };
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static int
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ipfilter_modevent(module_t mod, int type, void *unused)
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{
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int error = 0;
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switch (type)
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{
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case MOD_LOAD :
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error = ipf_modload();
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break;
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case MOD_UNLOAD :
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error = ipf_modunload();
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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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static int
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ipf_modload()
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{
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char *defpass, *c, *str;
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int i, j, error;
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if (ipf_load_all() != 0)
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return EIO;
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if (ipf_create_all(&ipfmain) == NULL)
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return EIO;
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error = ipfattach(&ipfmain);
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if (error)
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return error;
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for (i = 0; i < IPL_LOGSIZE; i++)
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ipf_devs[i] = NULL;
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for (i = 0; (str = ipf_devfiles[i]); i++) {
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c = NULL;
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for(j = strlen(str); j > 0; j--)
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if (str[j] == '/') {
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c = str + j + 1;
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break;
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}
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if (!c)
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c = str;
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ipf_devs[i] = make_dev(&ipf_cdevsw, i, 0, 0, 0600, c);
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}
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error = ipf_pfil_hook();
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if (error != 0)
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return error;
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ipf_event_reg();
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if (FR_ISPASS(ipfmain.ipf_pass))
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defpass = "pass";
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else if (FR_ISBLOCK(ipfmain.ipf_pass))
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defpass = "block";
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else
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defpass = "no-match -> block";
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printf("%s initialized. Default = %s all, Logging = %s%s\n",
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ipfilter_version, defpass,
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#ifdef IPFILTER_LOG
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"enabled",
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#else
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"disabled",
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#endif
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#ifdef IPFILTER_COMPILED
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" (COMPILED)"
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#else
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""
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#endif
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);
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return 0;
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}
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static int
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ipf_modunload()
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{
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int error, i;
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if (ipfmain.ipf_refcnt)
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return EBUSY;
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error = ipf_pfil_unhook();
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if (error != 0)
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return error;
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if (ipfmain.ipf_running >= 0) {
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error = ipfdetach(&ipfmain);
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if (error != 0)
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return error;
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ipf_destroy_all(&ipfmain);
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ipf_unload_all();
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} else
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error = 0;
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ipfmain.ipf_running = -2;
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for (i = 0; ipf_devfiles[i]; i++) {
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if (ipf_devs[i] != NULL)
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destroy_dev(ipf_devs[i]);
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}
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printf("%s unloaded\n", ipfilter_version);
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return error;
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}
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static moduledata_t ipfiltermod = {
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"ipfilter",
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ipfilter_modevent,
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0
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};
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DECLARE_MODULE(ipfilter, ipfiltermod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
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#ifdef MODULE_VERSION
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MODULE_VERSION(ipfilter, 1);
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#endif
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#if 0
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#ifdef SYSCTL_IPF
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int
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sysctl_ipf_int ( SYSCTL_HANDLER_ARGS )
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{
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int error = 0;
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if (arg1)
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error = SYSCTL_OUT(req, arg1, sizeof(int));
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else
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error = SYSCTL_OUT(req, &arg2, sizeof(int));
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if (error || !req->newptr)
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return (error);
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if (!arg1)
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error = EPERM;
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else {
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if ((oidp->oid_kind & CTLFLAG_OFF) && (ipfmain.ipf_running > 0))
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error = EBUSY;
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else
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error = SYSCTL_IN(req, arg1, sizeof(int));
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}
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return (error);
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}
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#endif
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#endif
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static int
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#if __FreeBSD_version >= 500043
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ipfpoll(struct cdev *dev, int events, struct thread *td)
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#else
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ipfpoll(dev_t dev, int events, struct proc *td)
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#endif
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{
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u_int unit = GET_MINOR(dev);
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int revents;
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if (unit < 0 || unit > IPL_LOGMAX)
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return 0;
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revents = 0;
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switch (unit)
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{
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case IPL_LOGIPF :
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case IPL_LOGNAT :
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case IPL_LOGSTATE :
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#ifdef IPFILTER_LOG
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if ((events & (POLLIN | POLLRDNORM)) && ipf_log_canread(&ipfmain, unit))
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revents |= events & (POLLIN | POLLRDNORM);
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#endif
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break;
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case IPL_LOGAUTH :
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if ((events & (POLLIN | POLLRDNORM)) && ipf_auth_waiting(&ipfmain))
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revents |= events & (POLLIN | POLLRDNORM);
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break;
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case IPL_LOGSYNC :
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if ((events & (POLLIN | POLLRDNORM)) && ipf_sync_canread(&ipfmain))
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revents |= events & (POLLIN | POLLRDNORM);
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if ((events & (POLLOUT | POLLWRNORM)) && ipf_sync_canwrite(&ipfmain))
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revents |= events & (POLLOUT | POLLWRNORM);
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break;
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case IPL_LOGSCAN :
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case IPL_LOGLOOKUP :
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default :
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break;
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}
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if ((revents == 0) && ((events & (POLLIN|POLLRDNORM)) != 0))
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selrecord(td, &ipfmain.ipf_selwait[unit]);
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return revents;
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}
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/*
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* routines below for saving IP headers to buffer
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*/
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static int ipfopen(dev, flags
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#if ((BSD >= 199506) || (__FreeBSD_version >= 220000))
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, devtype, p)
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int devtype;
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# if (__FreeBSD_version >= 500024)
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struct thread *p;
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# else
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struct proc *p;
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# endif /* __FreeBSD_version >= 500024 */
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#else
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)
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#endif
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#if (__FreeBSD_version >= 502116)
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struct cdev *dev;
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#else
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dev_t dev;
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#endif
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int flags;
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{
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u_int unit = GET_MINOR(dev);
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int error;
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if (IPL_LOGMAX < unit)
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error = ENXIO;
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else {
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switch (unit)
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{
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case IPL_LOGIPF :
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case IPL_LOGNAT :
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case IPL_LOGSTATE :
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case IPL_LOGAUTH :
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case IPL_LOGLOOKUP :
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case IPL_LOGSYNC :
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#ifdef IPFILTER_SCAN
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case IPL_LOGSCAN :
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#endif
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error = 0;
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break;
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default :
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error = ENXIO;
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break;
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}
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}
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return error;
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}
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static int ipfclose(dev, flags
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#if ((BSD >= 199506) || (__FreeBSD_version >= 220000))
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, devtype, p)
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int devtype;
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# if (__FreeBSD_version >= 500024)
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struct thread *p;
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# else
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struct proc *p;
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# endif /* __FreeBSD_version >= 500024 */
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#else
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)
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#endif
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#if (__FreeBSD_version >= 502116)
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struct cdev *dev;
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#else
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dev_t dev;
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#endif
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int flags;
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{
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u_int unit = GET_MINOR(dev);
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if (IPL_LOGMAX < unit)
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unit = ENXIO;
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else
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unit = 0;
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return unit;
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}
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/*
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* ipfread/ipflog
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* both of these must operate with at least splnet() lest they be
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* called during packet processing and cause an inconsistancy to appear in
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* the filter lists.
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*/
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#if (BSD >= 199306)
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static int ipfread(dev, uio, ioflag)
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int ioflag;
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#else
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static int ipfread(dev, uio)
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#endif
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#if (__FreeBSD_version >= 502116)
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struct cdev *dev;
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#else
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dev_t dev;
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#endif
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struct uio *uio;
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{
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u_int unit = GET_MINOR(dev);
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if (unit < 0)
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return ENXIO;
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if (ipfmain.ipf_running < 1)
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return EIO;
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if (unit == IPL_LOGSYNC)
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return ipf_sync_read(&ipfmain, uio);
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#ifdef IPFILTER_LOG
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return ipf_log_read(&ipfmain, unit, uio);
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#else
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return ENXIO;
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#endif
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}
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/*
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* ipfwrite
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* both of these must operate with at least splnet() lest they be
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* called during packet processing and cause an inconsistancy to appear in
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* the filter lists.
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*/
|
|
#if (BSD >= 199306)
|
|
static int ipfwrite(dev, uio, ioflag)
|
|
int ioflag;
|
|
#else
|
|
static int ipfwrite(dev, uio)
|
|
#endif
|
|
#if (__FreeBSD_version >= 502116)
|
|
struct cdev *dev;
|
|
#else
|
|
dev_t dev;
|
|
#endif
|
|
struct uio *uio;
|
|
{
|
|
|
|
if (ipfmain.ipf_running < 1)
|
|
return EIO;
|
|
|
|
if (GET_MINOR(dev) == IPL_LOGSYNC)
|
|
return ipf_sync_write(&ipfmain, uio);
|
|
return ENXIO;
|
|
}
|