/*
 * Copyright (C) 1993-2001, 2003 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/* #pragma ident   "@(#)solaris.c	1.12 6/5/96 (C) 1995 Darren Reed"*/
#pragma ident "@(#)$Id: solaris.c,v 2.73.2.6 2005/07/13 21:40:47 darrenr Exp $"

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/systm.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/uio.h>
#include <sys/buf.h>
#include <sys/modctl.h>
#include <sys/open.h>
#include <sys/kmem.h>
#include <sys/conf.h>
#include <sys/cmn_err.h>
#include <sys/stat.h>
#include <sys/cred.h>
#include <sys/dditypes.h>
#include <sys/poll.h>
#include <sys/autoconf.h>
#include <sys/byteorder.h>
#include <sys/socket.h>
#include <sys/dlpi.h>
#include <sys/stropts.h>
#include <sys/kstat.h>
#include <sys/sockio.h>
#include <sys/neti.h>
#include <sys/hook.h>
#include <net/if.h>
#if SOLARIS2 >= 6
# include <net/if_types.h>
#endif
#include <sys/netstack.h>
#include <net/af.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include "netinet/ip_compat.h"
#include "netinet/ipl.h"
#include "netinet/ip_fil.h"
#include "netinet/ip_nat.h"
#include "netinet/ip_frag.h"
#include "netinet/ip_auth.h"
#include "netinet/ip_state.h"
#include "netinet/ipf_stack.h"

extern	int	iplwrite __P((dev_t, struct uio *, cred_t *));

static	int	ipf_getinfo __P((dev_info_t *, ddi_info_cmd_t,
				 void *, void **));
#if SOLARIS2 < 10
static	int	ipf_identify __P((dev_info_t *));
#endif
static	int	ipf_attach __P((dev_info_t *, ddi_attach_cmd_t));
static	int	ipf_detach __P((dev_info_t *, ddi_detach_cmd_t));
static	int	ipf_property_g_update __P((dev_info_t *));
static	char	*ipf_devfiles[] = { IPL_NAME, IPNAT_NAME, IPSTATE_NAME,
				    IPAUTH_NAME, IPSYNC_NAME, IPSCAN_NAME,
				    IPLOOKUP_NAME, NULL };


static struct cb_ops ipf_cb_ops = {
	iplopen,
	iplclose,
	nodev,		/* strategy */
	nodev,		/* print */
	nodev,		/* dump */
	iplread,
	iplwrite,	/* write */
	iplioctl,	/* ioctl */
	nodev,		/* devmap */
	nodev,		/* mmap */
	nodev,		/* segmap */
	nochpoll,	/* poll */
	ddi_prop_op,
	NULL,
	D_MTSAFE,
#if SOLARIS2 > 4
	CB_REV,
	nodev,		/* aread */
	nodev,		/* awrite */
#endif
};

static struct dev_ops ipf_ops = {
	DEVO_REV,
	0,
	ipf_getinfo,
#if SOLARIS2 >= 10
	nulldev,
#else
	ipf_identify,
#endif
	nulldev,
	ipf_attach,
	ipf_detach,
	nodev,		/* reset */
	&ipf_cb_ops,
	(struct bus_ops *)0
};

extern struct mod_ops mod_driverops;
static struct modldrv iplmod = {
	&mod_driverops, IPL_VERSION, &ipf_ops };
static struct modlinkage modlink1 = { MODREV_1, &iplmod, NULL };

#if SOLARIS2 >= 6
static	size_t	hdrsizes[57][2] = {
	{ 0, 0 },
	{ IFT_OTHER, 0 },
	{ IFT_1822, 0 },
	{ IFT_HDH1822, 0 },
	{ IFT_X25DDN, 0 },
	{ IFT_X25, 0 },
	{ IFT_ETHER, 14 },
	{ IFT_ISO88023, 0 },
	{ IFT_ISO88024, 0 },
	{ IFT_ISO88025, 0 },
	{ IFT_ISO88026, 0 },
	{ IFT_STARLAN, 0 },
	{ IFT_P10, 0 },
	{ IFT_P80, 0 },
	{ IFT_HY, 0 },
	{ IFT_FDDI, 24 },
	{ IFT_LAPB, 0 },
	{ IFT_SDLC, 0 },
	{ IFT_T1, 0 },
	{ IFT_CEPT, 0 },
	{ IFT_ISDNBASIC, 0 },
	{ IFT_ISDNPRIMARY, 0 },
	{ IFT_PTPSERIAL, 0 },
	{ IFT_PPP, 0 },
	{ IFT_LOOP, 0 },
	{ IFT_EON, 0 },
	{ IFT_XETHER, 0 },
	{ IFT_NSIP, 0 },
	{ IFT_SLIP, 0 },
	{ IFT_ULTRA, 0 },
	{ IFT_DS3, 0 },
	{ IFT_SIP, 0 },
	{ IFT_FRELAY, 0 },
	{ IFT_RS232, 0 },
	{ IFT_PARA, 0 },
	{ IFT_ARCNET, 0 },
	{ IFT_ARCNETPLUS, 0 },
	{ IFT_ATM, 0 },
	{ IFT_MIOX25, 0 },
	{ IFT_SONET, 0 },
	{ IFT_X25PLE, 0 },
	{ IFT_ISO88022LLC, 0 },
	{ IFT_LOCALTALK, 0 },
	{ IFT_SMDSDXI, 0 },
	{ IFT_FRELAYDCE, 0 },
	{ IFT_V35, 0 },
	{ IFT_HSSI, 0 },
	{ IFT_HIPPI, 0 },
	{ IFT_MODEM, 0 },
	{ IFT_AAL5, 0 },
	{ IFT_SONETPATH, 0 },
	{ IFT_SONETVT, 0 },
	{ IFT_SMDSICIP, 0 },
	{ IFT_PROPVIRTUAL, 0 },
	{ IFT_PROPMUX, 0 },
};
#endif /* SOLARIS2 >= 6 */

dev_info_t *ipf_dev_info = NULL;

static const filter_kstats_t ipf_kstat_tmp = {
	{ "pass",			KSTAT_DATA_ULONG },
	{ "block",			KSTAT_DATA_ULONG },
	{ "nomatch",			KSTAT_DATA_ULONG },
	{ "short",			KSTAT_DATA_ULONG },
	{ "pass, logged",		KSTAT_DATA_ULONG },
	{ "block, logged",		KSTAT_DATA_ULONG },
	{ "nomatch, logged",		KSTAT_DATA_ULONG },
	{ "logged",			KSTAT_DATA_ULONG },
	{ "skip",			KSTAT_DATA_ULONG },
	{ "return sent",		KSTAT_DATA_ULONG },
	{ "acct",			KSTAT_DATA_ULONG },
	{ "bad frag state alloc",	KSTAT_DATA_ULONG },
	{ "new frag state kept",	KSTAT_DATA_ULONG },
	{ "new frag state compl. pkt",	KSTAT_DATA_ULONG },
	{ "bad pkt state alloc",	KSTAT_DATA_ULONG },
	{ "new pkt kept state",		KSTAT_DATA_ULONG },
	{ "cachehit",			KSTAT_DATA_ULONG },
	{ "tcp cksum bad",		KSTAT_DATA_ULONG },
	{{ "pullup ok",			KSTAT_DATA_ULONG },
	{ "pullup nok",			KSTAT_DATA_ULONG }},
	{ "src != route",		KSTAT_DATA_ULONG },
	{ "ttl invalid",		KSTAT_DATA_ULONG },
	{ "bad ip pkt",			KSTAT_DATA_ULONG },
	{ "ipv6 pkt",			KSTAT_DATA_ULONG },
	{ "dropped:pps ceiling",	KSTAT_DATA_ULONG },
	{ "ip upd. fail",		KSTAT_DATA_ULONG }
};


static int	ipf_kstat_update(kstat_t *ksp, int rwflag);

static void
ipf_kstat_init(ipf_stack_t *ifs, netstackid_t stackid)
{
	int 	i;

	for (i = 0; i < 2; i++) {
		ifs->ifs_kstatp[i] = kstat_create_netstack("ipf", 0,
			(i==0)?"inbound":"outbound",
			"net",
			KSTAT_TYPE_NAMED,
			sizeof (filter_kstats_t) / sizeof (kstat_named_t),
			0, stackid);
		if (ifs->ifs_kstatp[i] != NULL) {
			bcopy(&ipf_kstat_tmp, ifs->ifs_kstatp[i]->ks_data,
				sizeof (filter_kstats_t));
			ifs->ifs_kstatp[i]->ks_update = ipf_kstat_update;
			ifs->ifs_kstatp[i]->ks_private = &ifs->ifs_frstats[i];
			kstat_install(ifs->ifs_kstatp[i]);
		}
	}

#ifdef	IPFDEBUG
	cmn_err(CE_NOTE, "IP Filter: ipf_kstat_init() installed 0x%x, 0x%x",
		ifs->ifs_kstatp[0], ifs->ifs_kstatp[1]);
#endif
}

static void
ipf_kstat_fini(ipf_stack_t *ifs, netstackid_t stackid)
{
	int i;

	for (i = 0; i < 2; i++) {
		if (ifs->ifs_kstatp[i] != NULL) {
			kstat_delete_netstack(ifs->ifs_kstatp[i], stackid);
			ifs->ifs_kstatp[i] = NULL;
		}
	}
}

static int
ipf_kstat_update(kstat_t *ksp, int rwflag)
{
	filter_kstats_t	*fkp;
	filterstats_t	*fsp;

	if (ksp == NULL || ksp->ks_data == NULL)
		return (EIO);

	if (rwflag == KSTAT_WRITE)
		return (EACCES);

	fkp = ksp->ks_data;
	fsp = ksp->ks_private;

	fkp->fks_pass.value.ul		= fsp->fr_pass;
	fkp->fks_block.value.ul		= fsp->fr_block;
	fkp->fks_nom.value.ul		= fsp->fr_nom;
	fkp->fks_short.value.ul		= fsp->fr_short;
	fkp->fks_ppkl.value.ul		= fsp->fr_ppkl;
	fkp->fks_bpkl.value.ul		= fsp->fr_bpkl;
	fkp->fks_npkl.value.ul		= fsp->fr_npkl;
	fkp->fks_pkl.value.ul		= fsp->fr_pkl;
	fkp->fks_skip.value.ul		= fsp->fr_skip;
	fkp->fks_ret.value.ul		= fsp->fr_ret;
	fkp->fks_acct.value.ul		= fsp->fr_acct;
	fkp->fks_bnfr.value.ul		= fsp->fr_bnfr;
	fkp->fks_nfr.value.ul		= fsp->fr_nfr;
	fkp->fks_cfr.value.ul		= fsp->fr_cfr;
	fkp->fks_bads.value.ul		= fsp->fr_bads;
	fkp->fks_ads.value.ul		= fsp->fr_ads;
	fkp->fks_chit.value.ul		= fsp->fr_chit;
	fkp->fks_tcpbad.value.ul 	= fsp->fr_tcpbad;
	fkp->fks_pull[0].value.ul 	= fsp->fr_pull[0];
	fkp->fks_pull[1].value.ul 	= fsp->fr_pull[1];
	fkp->fks_badsrc.value.ul 	= fsp->fr_badsrc;
	fkp->fks_badttl.value.ul 	= fsp->fr_badttl;
	fkp->fks_bad.value.ul		= fsp->fr_bad;
	fkp->fks_ipv6.value.ul		= fsp->fr_ipv6;
	fkp->fks_ppshit.value.ul 	= fsp->fr_ppshit;
	fkp->fks_ipud.value.ul		= fsp->fr_ipud;

	return (0);
}

int _init()
{
	int ipfinst;

	ipfinst = mod_install(&modlink1);
#ifdef	IPFDEBUG
	cmn_err(CE_NOTE, "IP Filter: _init() = %d", ipfinst);
#endif
	return ipfinst;
}


int _fini(void)
{
	int ipfinst;

	ipfinst = mod_remove(&modlink1);
#ifdef	IPFDEBUG
	cmn_err(CE_NOTE, "IP Filter: _fini() = %d", ipfinst);
#endif
	return ipfinst;
}


int _info(modinfop)
struct modinfo *modinfop;
{
	int ipfinst;

	ipfinst = mod_info(&modlink1, modinfop);
#ifdef	IPFDEBUG
	cmn_err(CE_NOTE, "IP Filter: _info(%x) = %x", modinfop, ipfinst);
#endif
	return ipfinst;
}


#if SOLARIS2 < 10
static int ipf_identify(dip)
dev_info_t *dip;
{
# ifdef	IPFDEBUG
	cmn_err(CE_NOTE, "IP Filter: ipf_identify(%x)", dip);
# endif
	if (strcmp(ddi_get_name(dip), "ipf") == 0)
		return (DDI_IDENTIFIED);
	return (DDI_NOT_IDENTIFIED);
}
#endif

/*
 * Initialize things for IPF for each stack instance
 */
static void *
ipf_stack_init(netstackid_t stackid, netstack_t *ns)
{
	ipf_stack_t	*ifs;

#ifdef NS_DEBUG
	(void) printf("ipf_stack_init(%d)\n", stackid);
#endif

	KMALLOCS(ifs, ipf_stack_t *, sizeof (*ifs));
	bzero(ifs, sizeof (*ifs));

	ifs->ifs_netstack = ns;

	ifs->ifs_hook4_physical_in	= B_FALSE;
	ifs->ifs_hook4_physical_out	= B_FALSE;
	ifs->ifs_hook4_nic_events	= B_FALSE;
	ifs->ifs_hook4_loopback_in	= B_FALSE;
	ifs->ifs_hook4_loopback_out	= B_FALSE;
	ifs->ifs_hook6_physical_in	= B_FALSE;
	ifs->ifs_hook6_physical_out	= B_FALSE;
	ifs->ifs_hook6_nic_events	= B_FALSE;
	ifs->ifs_hook6_loopback_in	= B_FALSE;
	ifs->ifs_hook6_loopback_out	= B_FALSE;

	/*
	 * Initialize mutex's
	 */
	RWLOCK_INIT(&ifs->ifs_ipf_global, "ipf filter load/unload mutex");
	RWLOCK_INIT(&ifs->ifs_ipf_mutex, "ipf filter rwlock");
	RWLOCK_INIT(&ifs->ifs_ipf_frcache, "ipf cache rwlock");
#ifdef KERNEL
	ipf_kstat_init(ifs, stackid);
#endif

	/*
	 * Lock people out while we set things up.
	 */
	WRITE_ENTER(&ifs->ifs_ipf_global);
	ipftuneable_alloc(ifs);
	ifs->ifs_fr_timer_id = timeout(fr_slowtimer, (void *)ifs,
	    drv_usectohz(500000));

	RWLOCK_EXIT(&ifs->ifs_ipf_global);

	/* Limit to global stack */
	if (stackid == GLOBAL_NETSTACKID)
		cmn_err(CE_CONT, "!%s, running.\n", ipfilter_version);

	return (ifs);
}

static int ipf_detach_check_zone(ipf_stack_t *ifs)
{
	/*
	 * Make sure we're the only one's modifying things.  With
	 * this lock others should just fall out of the loop.
	 */
	READ_ENTER(&ifs->ifs_ipf_global);
	if (ifs->ifs_fr_running == 1) {
		RWLOCK_EXIT(&ifs->ifs_ipf_global);
		return (-1);
	}
	
	/*
	 * Make sure there is no active filter rule.
	 */
	if (ifs->ifs_ipfilter[0][ifs->ifs_fr_active] ||
	    ifs->ifs_ipfilter[1][ifs->ifs_fr_active] ||
	    ifs->ifs_ipfilter6[0][ifs->ifs_fr_active] ||
	    ifs->ifs_ipfilter6[1][ifs->ifs_fr_active]) {
		RWLOCK_EXIT(&ifs->ifs_ipf_global);
		return (-1);
	}

	RWLOCK_EXIT(&ifs->ifs_ipf_global);

	return (0);
}

static int ipf_detach_check_all()
{
	netstack_handle_t nh;
	netstack_t *ns;
	int ret;

	netstack_next_init(&nh);
	while ((ns = netstack_next(&nh)) != NULL) {
		ret = ipf_detach_check_zone(ns->netstack_ipf);
		netstack_rele(ns);
		if (ret != 0) {
			netstack_next_fini(&nh);
			return (-1);
		}
	}

	netstack_next_fini(&nh);
	return (0);
}

/*
 * Destroy things for ipf for one stack.
 */
/* ARGSUSED */
static void
ipf_stack_fini(netstackid_t stackid, void *arg)
{
	ipf_stack_t *ifs = (ipf_stack_t *)arg;

#ifdef NS_DEBUG
	(void) printf("ipf_stack_destroy(%p, stackid %d)\n",
	    (void *)ifs, stackid);
#endif

	/*
	 * Make sure we're the only one's modifying things.  With
	 * this lock others should just fall out of the loop.
	 */
	WRITE_ENTER(&ifs->ifs_ipf_global);
	if (ifs->ifs_fr_running == -2) {
		RWLOCK_EXIT(&ifs->ifs_ipf_global);
		return;
	}
	ifs->ifs_fr_running = -2;
	RWLOCK_EXIT(&ifs->ifs_ipf_global);

#ifdef KERNEL
	ipf_kstat_fini(ifs, stackid);
#endif
	if (ifs->ifs_fr_timer_id != 0) {
		(void) untimeout(ifs->ifs_fr_timer_id);
		ifs->ifs_fr_timer_id = 0;
	}

	WRITE_ENTER(&ifs->ifs_ipf_global);
	if (ipldetach(ifs) != 0) {
		printf("ipf_stack_fini: ipldetach failed\n");
	}

	ipftuneable_free(ifs);

	RWLOCK_EXIT(&ifs->ifs_ipf_global);
	RW_DESTROY(&ifs->ifs_ipf_mutex);
	RW_DESTROY(&ifs->ifs_ipf_frcache);
	RW_DESTROY(&ifs->ifs_ipf_global);

	KFREE(ifs);
}

static int ipf_attach(dip, cmd)
dev_info_t *dip;
ddi_attach_cmd_t cmd;
{
	char *s;
	int i;
	int instance;

#ifdef	IPFDEBUG
	cmn_err(CE_NOTE, "IP Filter: ipf_attach(%x,%x)", dip, cmd);
#endif

	switch (cmd)
	{
	case DDI_ATTACH:
		instance = ddi_get_instance(dip);
		/* Only one instance of ipf (instance 0) can be attached. */
		if (instance > 0)
			return DDI_FAILURE;

#ifdef	IPFDEBUG
		cmn_err(CE_NOTE, "IP Filter: attach ipf instance %d", instance);
#endif

		(void) ipf_property_g_update(dip);

		for (i = 0; ((s = ipf_devfiles[i]) != NULL); i++) {
			s = strrchr(s, '/');
			if (s == NULL)
				continue;
			s++;
			if (ddi_create_minor_node(dip, s, S_IFCHR, i,
						  DDI_PSEUDO, 0) ==
			    DDI_FAILURE) {
				ddi_remove_minor_node(dip, NULL);
				goto attach_failed;
			}
		}

		ipf_dev_info = dip;
		netstack_register(NS_IPF, ipf_stack_init, NULL,
		    ipf_stack_fini);
		return DDI_SUCCESS;
		/* NOTREACHED */
	default:
		break;
	}

attach_failed:
	ddi_prop_remove_all(dip);
	return DDI_FAILURE;
}


static int ipf_detach(dip, cmd)
dev_info_t *dip;
ddi_detach_cmd_t cmd;
{
	int i;

#ifdef	IPFDEBUG
	cmn_err(CE_NOTE, "IP Filter: ipf_detach(%x,%x)", dip, cmd);
#endif
	switch (cmd) {
	case DDI_DETACH:
		if (ipf_detach_check_all() != 0)
			return DDI_FAILURE;

		/* Undo what we did in ipf_attach, freeing resources
		 * and removing things we installed.  The system
		 * framework guarantees we are not active with this devinfo
		 * node in any other entry points at this time.
		 */
		ddi_prop_remove_all(dip);
		i = ddi_get_instance(dip);
		ddi_remove_minor_node(dip, NULL);
		if (i > 0) {
			cmn_err(CE_CONT, "IP Filter: still attached (%d)\n", i);
			return DDI_FAILURE;
		}

		netstack_unregister(NS_IPF);
		return DDI_SUCCESS;
		/* NOTREACHED */
	default:
		break;
	}
	cmn_err(CE_NOTE, "IP Filter: failed to detach\n");
	return DDI_FAILURE;
}


/*ARGSUSED*/
static int ipf_getinfo(dip, infocmd, arg, result)
dev_info_t *dip;
ddi_info_cmd_t infocmd;
void *arg, **result;
{
	int error;

	error = DDI_FAILURE;
#ifdef	IPFDEBUG
	cmn_err(CE_NOTE, "IP Filter: ipf_getinfo(%x,%x,%x)", dip, infocmd, arg);
#endif
	switch (infocmd) {
	case DDI_INFO_DEVT2DEVINFO:
		*result = ipf_dev_info;
		error = DDI_SUCCESS;
		break;
	case DDI_INFO_DEVT2INSTANCE:
		*result = (void *)0;
		error = DDI_SUCCESS;
		break;
	default:
		break;
	}
	return (error);
}


/*
 * Fetch configuration file values that have been entered into the ipf.conf
 * driver file.
 */
static int ipf_property_g_update(dip)
dev_info_t *dip;
{
#ifdef DDI_NO_AUTODETACH
	if (ddi_prop_update_int(DDI_DEV_T_NONE, dip,
				DDI_NO_AUTODETACH, 1) != DDI_PROP_SUCCESS) {
		cmn_err(CE_WARN, "!updating DDI_NO_AUTODETACH failed");
		return DDI_FAILURE;
	}
#else
	if (ddi_prop_update_int(DDI_DEV_T_NONE, dip,
				"ddi-no-autodetach", 1) != DDI_PROP_SUCCESS) {
		cmn_err(CE_WARN, "!updating ddi-no-autodetach failed");
		return DDI_FAILURE;
	}
#endif

	return DDI_SUCCESS;
}

int ipf_property_update(dip, ifs)
dev_info_t *dip;
ipf_stack_t *ifs;
{
	ipftuneable_t *ipft;
	int64_t *i64p;
	char *name;
	u_int one;
	int *i32p;
	int err;

	for (ipft = ifs->ifs_ipf_tuneables; (name = ipft->ipft_name) != NULL; ipft++) {
		one = 1;
		switch (ipft->ipft_sz)
		{
		case 4 :
			i32p = NULL;
			err = ddi_prop_lookup_int_array(DDI_DEV_T_ANY, dip,
							0, name, &i32p, &one);
			if (err == DDI_PROP_NOT_FOUND)
				continue;
#ifdef	IPFDEBUG
			cmn_err(CE_CONT, "IP Filter: lookup_int(%s) = %d\n",
				name, err);
#endif
			if (err != DDI_PROP_SUCCESS)
				return err;
			if (*i32p >= ipft->ipft_min && *i32p <= ipft->ipft_max)
				*ipft->ipft_pint = *i32p;
			else
				err = DDI_PROP_CANNOT_DECODE;
			ddi_prop_free(i32p);
			break;

#if SOLARIS2 > 8
		case 8 :
			i64p = NULL;
			err = ddi_prop_lookup_int64_array(DDI_DEV_T_ANY, dip,
							  0, name, &i64p, &one);
			if (err == DDI_PROP_NOT_FOUND)
				continue;
# ifdef	IPFDEBUG
			cmn_err(CE_CONT, "IP Filter: lookup_int64(%s) = %d\n",
				name, err);
# endif
			if (err != DDI_PROP_SUCCESS)
				return err;
			if (*i64p >= ipft->ipft_min && *i64p <= ipft->ipft_max)
				*ipft->ipft_pint = *i64p;
			else
				err = DDI_PROP_CANNOT_DECODE;
			ddi_prop_free(i64p);
			break;
#endif
		default :
			break;
		}
		if (err != DDI_SUCCESS)
			break;
	}
	return err;
}