xref: /freebsd/sys/netpfil/ipfilter/netinet/ip_rules.c (revision 71625ec9)

/*
* Copyright (C) 2012 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/

#include <sys/param.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#if defined(__FreeBSD__)
# if defined(_KERNEL)
#  include <sys/libkern.h>
# else
#  include <sys/unistd.h>
# endif
#else
# include <sys/systm.h>
#endif
#include <sys/errno.h>
#include <sys/param.h>
#if !defined(__SVR4)
# include <sys/mbuf.h>
#endif
#if defined(__FreeBSD__)
# include <sys/sockio.h>
#if defined(_KERNEL)
#include <net/vnet.h>
#else
#define CURVNET_SET(arg)
#define CURVNET_RESTORE()
#define	VNET_DEFINE(_t, _v)	_t _v
#define	VNET_DECLARE(_t, _v)	extern _t _v
#define	VNET(arg)	arg
#endif
#else
# include <sys/ioctl.h>
#endif /* FreeBSD */
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include "netinet/ip_compat.h"
#include "netinet/ip_fil.h"

#include "netinet/ip_rules.h"

#ifndef _KERNEL
# include <string.h>
#endif /* _KERNEL */

#ifdef IPFILTER_COMPILED

VNET_DECLARE(ipf_main_softc_t, ipfmain);
#define	V_ipfmain		VNET(ipfmain)


static u_long in_rule__0[] = {
0, 0, 0, 0, 0, 0, 0, 0x8070d88, 0, 0, 0, 0xffffffff, 0, 0, 0, 0, 0, 0, 0, 0xffffffff, 0x1b0, 0x1, 0, 0, 0, 0x2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x40000000, 0x8002, 0, 0, 0, 0xffff, 0, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xffffffff, 0, 0, 0, 0, 0, 0, 0, 0, 0xffffffff, 0, 0, 0, 0, 0, 0, 0, 0, 0xffffffff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xffffffff, 0, 0, 0, 0
};

static u_long out_rule__0[] = {
0, 0, 0, 0, 0, 0, 0, 0x8070d88, 0, 0, 0, 0xffffffff, 0, 0, 0, 0, 0, 0, 0, 0xffffffff, 0x1b0, 0x1, 0, 0, 0, 0x3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x40000000, 0x4002, 0, 0, 0, 0xffff, 0, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xffffffff, 0, 0, 0, 0, 0, 0, 0, 0, 0xffffffff, 0, 0, 0, 0, 0, 0, 0, 0, 0xffffffff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xffffffff, 0, 0, 0, 0
};

frentry_t *ipf_rules_in_[1] = {
	(frentry_t *)&in_rule__0
};

/* XXX	This file (ip_rules.c) is not part of the ipfilter tarball, it is
   XXX	generated by the ipfilter build process. Unfortunately the build
   XXX  process did not generate the following lines so they are added
   XXX	by hand here. This is a bit of a hack but it works for now. Future
   XXX  imports/merges of ipfilter may generate this so the following will
   XXX	need to be removed following some future merge.
   XXX	*/
frentry_t *ipf_rules_out_[1] = {
	(frentry_t *)&out_rule__0
};

frentry_t *ipfrule_match_in_(fin, passp)
fr_info_t *fin;
u_32_t *passp;
{
	frentry_t *fr = NULL;

	fr = (frentry_t *)&in_rule__0;
	return (fr);
}

frentry_t *ipfrule_match_out_(fin, passp)
fr_info_t *fin;
u_32_t *passp;
{
	frentry_t *fr = NULL;

	fr = (frentry_t *)&out_rule__0;
	return (fr);
}
static frentry_t ipfrule_out_;

int ipfrule_add_out_(void)
{
	int i, j, err = 0, max;
	frentry_t *fp;

	max = sizeof(ipf_rules_out_)/sizeof(frentry_t *);
	for (i = 0; i < max; i++) {
		fp = ipf_rules_out_[i];
		fp->fr_next = NULL;
		for (j = i + 1; j < max; j++)
			if (strncmp(fp->fr_names + fp->fr_group,
				    ipf_rules_out_[j]->fr_names +
				    ipf_rules_out_[j]->fr_group,
				    FR_GROUPLEN) == 0) {
				if (ipf_rules_out_[j] != NULL)
					ipf_rules_out_[j]->fr_pnext =
					    &fp->fr_next;
				fp->fr_pnext = &ipf_rules_out_[j];
				fp->fr_next = ipf_rules_out_[j];
				break;
			}
	}

	fp = &ipfrule_out_;
	bzero((char *)fp, sizeof(*fp));
	fp->fr_type = FR_T_CALLFUNC_BUILTIN;
	fp->fr_flags = FR_OUTQUE|FR_NOMATCH;
	fp->fr_data = (void *)ipf_rules_out_[0];
	fp->fr_dsize = sizeof(ipf_rules_out_[0]);
	fp->fr_family = AF_INET;
	fp->fr_func = (ipfunc_t)ipfrule_match_out_;
	err = frrequest(&V_ipfmain, IPL_LOGIPF, SIOCADDFR, (caddr_t)fp,
			V_ipfmain.ipf_active, 0);
	return (err);
}


int ipfrule_remove_out_(void)
{
	int err = 0, i;
	frentry_t *fp;

	/*
	 * Try to remove the outbound rule.
	 */
	if (ipfrule_out_.fr_ref > 0) {
		err = EBUSY;
	} else {
		i = sizeof(ipf_rules_out_)/sizeof(frentry_t *) - 1;
		for (; i >= 0; i--) {
			fp = ipf_rules_out_[i];
			if (fp->fr_ref > 1) {
				err = EBUSY;
				break;
			}
		}
	}
	if (err == 0)
		err = frrequest(&V_ipfmain, IPL_LOGIPF, SIOCDELFR,
				(caddr_t)&ipfrule_out_,
				V_ipfmain.ipf_active, 0);
	if (err)
		return (err);


	return (err);
}
static frentry_t ipfrule_in_;

int ipfrule_add_in_(void)
{
	int i, j, err = 0, max;
	frentry_t *fp;

	max = sizeof(ipf_rules_in_)/sizeof(frentry_t *);
	for (i = 0; i < max; i++) {
		fp = ipf_rules_in_[i];
		fp->fr_next = NULL;
		for (j = i + 1; j < max; j++)
			if (strncmp(fp->fr_names + fp->fr_group,
				    ipf_rules_in_[j]->fr_names +
				    ipf_rules_in_[j]->fr_group,
				    FR_GROUPLEN) == 0) {
				if (ipf_rules_in_[j] != NULL)
					ipf_rules_in_[j]->fr_pnext =
					    &fp->fr_next;
				fp->fr_pnext = &ipf_rules_in_[j];
				fp->fr_next = ipf_rules_in_[j];
				break;
			}
	}

	fp = &ipfrule_in_;
	bzero((char *)fp, sizeof(*fp));
	fp->fr_type = FR_T_CALLFUNC_BUILTIN;
	fp->fr_flags = FR_INQUE|FR_NOMATCH;
	fp->fr_data = (void *)ipf_rules_in_[0];
	fp->fr_dsize = sizeof(ipf_rules_in_[0]);
	fp->fr_family = AF_INET;
	fp->fr_func = (ipfunc_t)ipfrule_match_in_;
	err = frrequest(&V_ipfmain, IPL_LOGIPF, SIOCADDFR, (caddr_t)fp,
			V_ipfmain.ipf_active, 0);
	return (err);
}


int ipfrule_remove_in_(void)
{
	int err = 0, i;
	frentry_t *fp;

	/*
	 * Try to remove the inbound rule.
	 */
	if (ipfrule_in_.fr_ref > 0) {
		err = EBUSY;
	} else {
		i = sizeof(ipf_rules_in_)/sizeof(frentry_t *) - 1;
		for (; i >= 0; i--) {
			fp = ipf_rules_in_[i];
			if (fp->fr_ref > 1) {
				err = EBUSY;
				break;
			}
		}
	}
	if (err == 0)
		err = frrequest(&V_ipfmain, IPL_LOGIPF, SIOCDELFR,
				(caddr_t)&ipfrule_in_,
				V_ipfmain.ipf_active, 0);
	if (err)
		return (err);


	return (err);
}

int ipfrule_add(void)
{
	int err;

	err = ipfrule_add_out_();
	if (err != 0)
		return (err);
	err = ipfrule_add_in_();
	if (err != 0)
		return (err);
	return (0);
}


int ipfrule_remove(void)
{
	int err;

	err = ipfrule_remove_out_();
	if (err != 0)
		return (err);
	err = ipfrule_remove_in_();
	if (err != 0)
		return (err);
	return (0);
}
#endif /* IPFILTER_COMPILED */