/* Code to take an arptables-style command line and do it. */

/*

 * arptables:

 * Author: Bart De Schuymer <bdschuym@pandora.be>, but

 * almost all code is from the iptables userspace program, which has main

 * authors: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au

 *

 *	This program is free software; you can redistribute it and/or modify

 *	it under the terms of the GNU General Public License as published by

 *	the Free Software Foundation; either version 2 of the License, or

 *	(at your option) any later version.

 *

 *	This program is distributed in the hope that it will be useful,

 *	but WITHOUT ANY WARRANTY; without even the implied warranty of

 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *	GNU General Public License for more details.

 *

 *	You should have received a copy of the GNU General Public License

 *	along with this program; if not, write to the Free Software

 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

/*

  Currently, only support for specifying hardware addresses for Ethernet

  is available.

  This tool is not luser-proof: you can specify an Ethernet source address

  and set hardware length to something different than 6, f.e.

*/

#include "config.h"

#include <getopt.h>

#include <string.h>

#include <netdb.h>

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <inttypes.h>

#include <dlfcn.h>

#include <ctype.h>

#include <stdarg.h>

#include <limits.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/wait.h>

#include <net/if.h>

#include <netinet/ether.h>

#include <iptables.h>

#include <xtables.h>

#include "xshared.h"

#include "nft.h"

#include "nft-arp.h"

#include <linux/netfilter_arp/arp_tables.h>

#define NUMBER_OF_OPT	16

static const char optflags[NUMBER_OF_OPT]

= { 'n', 's', 'd', 2, 3, 7, 8, 4, 5, 6, 'j', 'v', 'i', 'o', '0', 'c'};

static struct option original_opts[] = {

	{ "append", 1, 0, 'A' },

	{ "delete", 1, 0,  'D' },

	{ "insert", 1, 0,  'I' },

	{ "replace", 1, 0,  'R' },

	{ "list", 2, 0,  'L' },

	{ "flush", 2, 0,  'F' },

	{ "zero", 2, 0,  'Z' },

	{ "new-chain", 1, 0,  'N' },

	{ "delete-chain", 2, 0,  'X' },

	{ "rename-chain", 1, 0,  'E' },

	{ "policy", 1, 0,  'P' },

	{ "source-ip", 1, 0, 's' },

	{ "destination-ip", 1, 0,  'd' },

	{ "src-ip", 1, 0,  's' },

	{ "dst-ip", 1, 0,  'd' },

	{ "source-mac", 1, 0, 2},

	{ "destination-mac", 1, 0, 3},

	{ "src-mac", 1, 0, 2},

	{ "dst-mac", 1, 0, 3},

	{ "h-length", 1, 0,  'l' },

	{ "p-length", 1, 0,  8 },

	{ "opcode", 1, 0,  4 },

	{ "h-type", 1, 0,  5 },

	{ "proto-type", 1, 0,  6 },

	{ "in-interface", 1, 0, 'i' },

	{ "jump", 1, 0, 'j' },

	{ "table", 1, 0, 't' },

	{ "match", 1, 0, 'm' },

	{ "numeric", 0, 0, 'n' },

	{ "out-interface", 1, 0, 'o' },

	{ "verbose", 0, 0, 'v' },

	{ "exact", 0, 0, 'x' },

	{ "version", 0, 0, 'V' },

	{ "help", 2, 0, 'h' },

	{ "line-numbers", 0, 0, '0' },

	{ "modprobe", 1, 0, 'M' },

	{ "set-counters", 1, 0, 'c' },

	{ 0 }

};

#define opts xt_params->opts

extern void xtables_exit_error(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3)));

struct xtables_globals arptables_globals = {

	.option_offset		= 0,

	.program_version	= PACKAGE_VERSION,

	.orig_opts		= original_opts,

	.exit_err		= xtables_exit_error,

	.compat_rev		= nft_compatible_revision,

};

/* index relates to bit of each OPT_* value */

static int inverse_for_options[] =

{

/* -n */ 0,

/* -s */ ARPT_INV_SRCIP,

/* -d */ ARPT_INV_TGTIP,

/* -p */ 0,

/* -j */ 0,

/* -v */ 0,

/* -x */ 0,

/* -i */ ARPT_INV_VIA_IN,

/* -o */ ARPT_INV_VIA_OUT,

/*--line*/ 0,

/* -c */ 0,

/* 2 */ ARPT_INV_SRCDEVADDR,

/* 3 */ ARPT_INV_TGTDEVADDR,

/* -l */ ARPT_INV_ARPHLN,

/* 4 */ ARPT_INV_ARPOP,

/* 5 */ ARPT_INV_ARPHRD,

/* 6 */ ARPT_INV_ARPPRO,

};

/***********************************************/

/* ARPTABLES SPECIFIC NEW FUNCTIONS ADDED HERE */

/***********************************************/

static unsigned char mac_type_unicast[ETH_ALEN] =   {0,0,0,0,0,0};

static unsigned char msk_type_unicast[ETH_ALEN] =   {1,0,0,0,0,0};

static unsigned char mac_type_multicast[ETH_ALEN] = {1,0,0,0,0,0};

static unsigned char msk_type_multicast[ETH_ALEN] = {1,0,0,0,0,0};

static unsigned char mac_type_broadcast[ETH_ALEN] = {255,255,255,255,255,255};

static unsigned char msk_type_broadcast[ETH_ALEN] = {255,255,255,255,255,255};

/*

 * put the mac address into 6 (ETH_ALEN) bytes

 */

static int getmac_and_mask(char *from, char *to, char *mask)

{

	char *p;

	int i;

	struct ether_addr *addr;

	if (strcasecmp(from, "Unicast") == 0) {

		memcpy(to, mac_type_unicast, ETH_ALEN);

		memcpy(mask, msk_type_unicast, ETH_ALEN);

		return 0;

	}

	if (strcasecmp(from, "Multicast") == 0) {

		memcpy(to, mac_type_multicast, ETH_ALEN);

		memcpy(mask, msk_type_multicast, ETH_ALEN);

		return 0;

	}

	if (strcasecmp(from, "Broadcast") == 0) {

		memcpy(to, mac_type_broadcast, ETH_ALEN);

		memcpy(mask, msk_type_broadcast, ETH_ALEN);

		return 0;

	}

	if ( (p = strrchr(from, '/')) != NULL) {

		*p = '\0';

		if (!(addr = ether_aton(p + 1)))

			return -1;

		memcpy(mask, addr, ETH_ALEN);

	} else

		memset(mask, 0xff, ETH_ALEN);

	if (!(addr = ether_aton(from)))

		return -1;

	memcpy(to, addr, ETH_ALEN);

	for (i = 0; i < ETH_ALEN; i++)

		to[i] &= mask[i];

	return 0;

}

static int getlength_and_mask(char *from, uint8_t *to, uint8_t *mask)

{

	char *p, *buffer;

	int i;

	if ( (p = strrchr(from, '/')) != NULL) {

		*p = '\0';

		i = strtol(p+1, &buffer, 10);

		if (*buffer != '\0' || i < 0 || i > 255)

			return -1;

		*mask = (uint8_t)i;

	} else

		*mask = 255;

	i = strtol(from, &buffer, 10);

	if (*buffer != '\0' || i < 0 || i > 255)

		return -1;

	*to = (uint8_t)i;

	return 0;

}

static int get16_and_mask(char *from, uint16_t *to, uint16_t *mask, int base)

{

	char *p, *buffer;

	int i;

	if ( (p = strrchr(from, '/')) != NULL) {

		*p = '\0';

		i = strtol(p+1, &buffer, base);

		if (*buffer != '\0' || i < 0 || i > 65535)

			return -1;

		*mask = htons((uint16_t)i);

	} else

		*mask = 65535;

	i = strtol(from, &buffer, base);

	if (*buffer != '\0' || i < 0 || i > 65535)

		return -1;

	*to = htons((uint16_t)i);

	return 0;

}

/*********************************************/

/* ARPTABLES SPECIFIC NEW FUNCTIONS END HERE */

/*********************************************/

static void

exit_tryhelp(int status)

{

	fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",

		arptables_globals.program_name,

		arptables_globals.program_version);

	exit(status);

}

static void

exit_printhelp(void)

{

	struct xtables_target *t = NULL;

	int i;

	printf("%s v%s\n\n"

"Usage: %s -[AD] chain rule-specification [options]\n"

"       %s -[RI] chain rulenum rule-specification [options]\n"

"       %s -D chain rulenum [options]\n"

"       %s -[LFZ] [chain] [options]\n"

"       %s -[NX] chain\n"

"       %s -E old-chain-name new-chain-name\n"

"       %s -P chain target [options]\n"

"       %s -h (print this help information)\n\n",

	       arptables_globals.program_name,

	       arptables_globals.program_version,

	       arptables_globals.program_name,

	       arptables_globals.program_name,

	       arptables_globals.program_name,

	       arptables_globals.program_name,

	       arptables_globals.program_name,

	       arptables_globals.program_name,

	       arptables_globals.program_name,

	       arptables_globals.program_name);

	printf(

"Commands:\n"

"Either long or short options are allowed.\n"

"  --append  -A chain		Append to chain\n"

"  --delete  -D chain		Delete matching rule from chain\n"

"  --delete  -D chain rulenum\n"

"				Delete rule rulenum (1 = first) from chain\n"

"  --insert  -I chain [rulenum]\n"

"				Insert in chain as rulenum (default 1=first)\n"

"  --replace -R chain rulenum\n"

"				Replace rule rulenum (1 = first) in chain\n"

"  --list    -L [chain]		List the rules in a chain or all chains\n"

"  --flush   -F [chain]		Delete all rules in  chain or all chains\n"

"  --zero    -Z [chain]		Zero counters in chain or all chains\n"

"  --new     -N chain		Create a new user-defined chain\n"

"  --delete-chain\n"

"            -X [chain]		Delete a user-defined chain\n"

"  --policy  -P chain target\n"

"				Change policy on chain to target\n"

"  --rename-chain\n"

"            -E old-chain new-chain\n"

"				Change chain name, (moving any references)\n"

"Options:\n"

"  --source-ip	-s [!] address[/mask]\n"

"				source specification\n"

"  --destination-ip -d [!] address[/mask]\n"

"				destination specification\n"

"  --source-mac [!] address[/mask]\n"

"  --destination-mac [!] address[/mask]\n"

"  --h-length   -l   length[/mask] hardware length (nr of bytes)\n"

"  --opcode code[/mask] operation code (2 bytes)\n"

"  --h-type   type[/mask]  hardware type (2 bytes, hexadecimal)\n"

"  --proto-type   type[/mask]  protocol type (2 bytes)\n"

"  --in-interface -i [!] input name[+]\n"

"				network interface name ([+] for wildcard)\n"

"  --out-interface -o [!] output name[+]\n"

"				network interface name ([+] for wildcard)\n"

"  --jump	-j target\n"

"				target for rule (may load target extension)\n"

"  --match	-m match\n"

"				extended match (may load extension)\n"

"  --numeric	-n		numeric output of addresses and ports\n"

"  --table	-t table	table to manipulate (default: `filter')\n"

"  --verbose	-v		verbose mode\n"

"  --line-numbers		print line numbers when listing\n"

"  --exact	-x		expand numbers (display exact values)\n"

"  --modprobe=<command>		try to insert modules using this command\n"

"  --set-counters -c PKTS BYTES	set the counter during insert/append\n"

"[!] --version	-V		print package version.\n");

	printf(" opcode strings: \n");

        for (i = 0; i < NUMOPCODES; i++)

                printf(" %d = %s\n", i + 1, arp_opcodes[i]);

        printf(

" hardware type string: 1 = Ethernet\n"

" protocol type string: 0x800 = IPv4\n");

	/* Print out any special helps. A user might like to be able

		to add a --help to the commandline, and see expected

		results. So we call help for all matches & targets */

	for (t = xtables_targets; t; t = t->next) {

		if (strcmp(t->name, "CLASSIFY") && strcmp(t->name, "mangle"))

			continue;

		printf("\n");

		t->help();

	}

	exit(0);

}

static char

opt2char(int option)

{

	const char *ptr;

	for (ptr = optflags; option > 1; option >>= 1, ptr++);

	return *ptr;

}

static int

check_inverse(const char option[], int *invert, int *optidx, int argc)

{

	if (option && strcmp(option, "!") == 0) {

		if (*invert)

			xtables_error(PARAMETER_PROBLEM,

				      "Multiple `!' flags not allowed");

		*invert = true;

		if (optidx) {

			*optidx = *optidx+1;

			if (argc && *optidx > argc)

				xtables_error(PARAMETER_PROBLEM,

					      "no argument following `!'");

		}

		return true;

	}

	return false;

}

static void

set_option(unsigned int *options, unsigned int option, u_int16_t *invflg,

	   int invert)

{

	if (*options & option)

		xtables_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed",

			      opt2char(option));

	*options |= option;

	if (invert) {

		unsigned int i;

		for (i = 0; 1 << i != option; i++);

		if (!inverse_for_options[i])

			xtables_error(PARAMETER_PROBLEM,

				      "cannot have ! before -%c",

				      opt2char(option));

		*invflg |= inverse_for_options[i];

	}

}

static int

list_entries(struct nft_handle *h, const char *chain, const char *table,

	     int rulenum, int verbose, int numeric, int expanded,

	     int linenumbers)

{

	unsigned int format;

	format = FMT_OPTIONS;

	if (!verbose)

		format |= FMT_NOCOUNTS;

	else

		format |= FMT_VIA;

	if (numeric)

		format |= FMT_NUMERIC;

	if (!expanded)

		format |= FMT_KILOMEGAGIGA;

	if (linenumbers)

		format |= FMT_LINENUMBERS;

	return nft_rule_list(h, chain, table, rulenum, format);

}

static int

append_entry(struct nft_handle *h,

	     const char *chain,

	     const char *table,

	     struct iptables_command_state *cs,

	     int rulenum,

	     unsigned int nsaddrs,

	     const struct in_addr saddrs[],

	     const struct in_addr smasks[],

	     unsigned int ndaddrs,

	     const struct in_addr daddrs[],

	     const struct in_addr dmasks[],

	     bool verbose, bool append)

{

	unsigned int i, j;

	int ret = 1;

	for (i = 0; i < nsaddrs; i++) {

		cs->arp.arp.src.s_addr = saddrs[i].s_addr;

		cs->arp.arp.smsk.s_addr = smasks[i].s_addr;

		for (j = 0; j < ndaddrs; j++) {

			cs->arp.arp.tgt.s_addr = daddrs[j].s_addr;

			cs->arp.arp.tmsk.s_addr = dmasks[j].s_addr;

			if (append) {

				ret = nft_rule_append(h, chain, table, cs, NULL,

						      verbose);

			} else {

				ret = nft_rule_insert(h, chain, table, cs,

						      rulenum, verbose);

			}

		}

	}

	return ret;

}

static int

replace_entry(const char *chain,

	      const char *table,

	      struct iptables_command_state *cs,

	      unsigned int rulenum,

	      const struct in_addr *saddr,

	      const struct in_addr *smask,

	      const struct in_addr *daddr,

	      const struct in_addr *dmask,

	      bool verbose, struct nft_handle *h)

{

	cs->arp.arp.src.s_addr = saddr->s_addr;

	cs->arp.arp.tgt.s_addr = daddr->s_addr;

	cs->arp.arp.smsk.s_addr = smask->s_addr;

	cs->arp.arp.tmsk.s_addr = dmask->s_addr;

	return nft_rule_replace(h, chain, table, cs, rulenum, verbose);

}

static int

delete_entry(const char *chain,

	     const char *table,

	     struct iptables_command_state *cs,

	     unsigned int nsaddrs,

	     const struct in_addr saddrs[],

	     const struct in_addr smasks[],

	     unsigned int ndaddrs,

	     const struct in_addr daddrs[],

	     const struct in_addr dmasks[],

	     bool verbose, struct nft_handle *h)

{

	unsigned int i, j;

	int ret = 1;

	for (i = 0; i < nsaddrs; i++) {

		cs->arp.arp.src.s_addr = saddrs[i].s_addr;

		cs->arp.arp.smsk.s_addr = smasks[i].s_addr;

		for (j = 0; j < ndaddrs; j++) {

			cs->arp.arp.tgt.s_addr = daddrs[j].s_addr;

			cs->arp.arp.tmsk.s_addr = dmasks[j].s_addr;

			ret = nft_rule_delete(h, chain, table, cs, verbose);

		}

	}

	return ret;

}

int nft_init_arp(struct nft_handle *h, const char *pname)

{

	arptables_globals.program_name = pname;

	if (xtables_init_all(&arptables_globals, NFPROTO_ARP) < 0) {

		fprintf(stderr, "%s/%s Failed to initialize arptables-compat\n",

			arptables_globals.program_name,

			arptables_globals.program_version);

		exit(1);

	}

#if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)

	init_extensionsa();

#endif

	if (nft_init(h, NFPROTO_ARP, xtables_arp) < 0)

		xtables_error(OTHER_PROBLEM,

			      "Could not initialize nftables layer.");

	return 0;

}

int do_commandarp(struct nft_handle *h, int argc, char *argv[], char **table,

		  bool restore)

{

	struct iptables_command_state cs = {

		.jumpto = "",

		.arp.arp = {

			.arhln = 6,

			.arhln_mask = 255,

			.arhrd = htons(ARPHRD_ETHER),

			.arhrd_mask = 65535,

		},

	};

	int invert = 0;

	unsigned int nsaddrs = 0, ndaddrs = 0;

	struct in_addr *saddrs = NULL, *smasks = NULL;

	struct in_addr *daddrs = NULL, *dmasks = NULL;

	int c, verbose = 0;

	const char *chain = NULL;

	const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL;

	const char *policy = NULL, *newname = NULL;

	unsigned int rulenum = 0, options = 0, command = 0;

	const char *pcnt = NULL, *bcnt = NULL;

	int ret = 1;

	struct xtables_target *t;

	/* re-set optind to 0 in case do_command gets called

	 * a second time */

	optind = 0;

	for (t = xtables_targets; t; t = t->next) {

		t->tflags = 0;

		t->used = 0;

	}

	/* Suppress error messages: we may add new options if we

	    demand-load a protocol. */

	opterr = 0;

	opts = xt_params->orig_opts;

	while ((c = getopt_long(argc, argv,

	   "-A:D:R:I:L::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:l:i:vnt:m:c:",

					   opts, NULL)) != -1) {

		switch (c) {

			/*

			 * Command selection

			 */

		case 'A':

			add_command(&command, CMD_APPEND, CMD_NONE,

				    invert);

			chain = optarg;

			break;

		case 'D':

			add_command(&command, CMD_DELETE, CMD_NONE,

				    invert);

			chain = optarg;

			if (xs_has_arg(argc, argv)) {

				rulenum = parse_rulenumber(argv[optind++]);

				command = CMD_DELETE_NUM;

			}

			break;

		case 'R':

			add_command(&command, CMD_REPLACE, CMD_NONE,

				    invert);

			chain = optarg;

			if (xs_has_arg(argc, argv))

				rulenum = parse_rulenumber(argv[optind++]);

			else

				xtables_error(PARAMETER_PROBLEM,

					      "-%c requires a rule number",

					      cmd2char(CMD_REPLACE));

			break;

		case 'I':

			add_command(&command, CMD_INSERT, CMD_NONE,

				    invert);

			chain = optarg;

			if (xs_has_arg(argc, argv))

				rulenum = parse_rulenumber(argv[optind++]);

			else rulenum = 1;

			break;

		case 'L':

			add_command(&command, CMD_LIST, CMD_ZERO,

				    invert);

			if (optarg) chain = optarg;

			else if (xs_has_arg(argc, argv))

				chain = argv[optind++];

			break;

		case 'F':

			add_command(&command, CMD_FLUSH, CMD_NONE,

				    invert);

			if (optarg) chain = optarg;

			else if (xs_has_arg(argc, argv))

				chain = argv[optind++];

			break;

		case 'Z':

			add_command(&command, CMD_ZERO, CMD_LIST,

				    invert);

			if (optarg) chain = optarg;

			else if (xs_has_arg(argc, argv))

				chain = argv[optind++];

			break;

		case 'N':

			if (optarg && *optarg == '-')

				xtables_error(PARAMETER_PROBLEM,

					      "chain name not allowed to start "

					      "with `-'\n");

			if (xtables_find_target(optarg, XTF_TRY_LOAD))

				xtables_error(PARAMETER_PROBLEM,

						"chain name may not clash "

						"with target name\n");

			add_command(&command, CMD_NEW_CHAIN, CMD_NONE,

				    invert);

			chain = optarg;

			break;

		case 'X':

			add_command(&command, CMD_DELETE_CHAIN, CMD_NONE,

				    invert);

			if (optarg) chain = optarg;

			else if (xs_has_arg(argc, argv))

				chain = argv[optind++];

			break;

		case 'E':

			add_command(&command, CMD_RENAME_CHAIN, CMD_NONE,

				    invert);

			chain = optarg;

			if (xs_has_arg(argc, argv))

				newname = argv[optind++];

			else

				xtables_error(PARAMETER_PROBLEM,

					      "-%c requires old-chain-name and "

					      "new-chain-name",

					      cmd2char(CMD_RENAME_CHAIN));

			break;

		case 'P':

			add_command(&command, CMD_SET_POLICY, CMD_NONE,

				    invert);

			chain = optarg;

			if (xs_has_arg(argc, argv))

				policy = argv[optind++];

			else

				xtables_error(PARAMETER_PROBLEM,

					      "-%c requires a chain and a policy",

					      cmd2char(CMD_SET_POLICY));

			break;

		case 'h':

			if (!optarg)

				optarg = argv[optind];

			exit_printhelp();

			break;

		case 's':

			check_inverse(optarg, &invert, &optind, argc);

			set_option(&options, OPT_SOURCE, &cs.arp.arp.invflags,

				   invert);

			shostnetworkmask = argv[optind-1];

			break;

		case 'd':

			check_inverse(optarg, &invert, &optind, argc);

			set_option(&options, OPT_DESTINATION, &cs.arp.arp.invflags,

				   invert);

			dhostnetworkmask = argv[optind-1];

			break;

		case 2:/* src-mac */

			check_inverse(optarg, &invert, &optind, argc);

			set_option(&options, OPT_S_MAC, &cs.arp.arp.invflags,

				   invert);

			if (getmac_and_mask(argv[optind - 1],

			    cs.arp.arp.src_devaddr.addr, cs.arp.arp.src_devaddr.mask))

				xtables_error(PARAMETER_PROBLEM, "Problem with specified "

						"source mac");

			break;

		case 3:/* dst-mac */

			check_inverse(optarg, &invert, &optind, argc);

			set_option(&options, OPT_D_MAC, &cs.arp.arp.invflags,

				   invert);

			if (getmac_and_mask(argv[optind - 1],

			    cs.arp.arp.tgt_devaddr.addr, cs.arp.arp.tgt_devaddr.mask))

				xtables_error(PARAMETER_PROBLEM, "Problem with specified "

						"destination mac");

			break;

		case 'l':/* hardware length */

			check_inverse(optarg, &invert, &optind, argc);

			set_option(&options, OPT_H_LENGTH, &cs.arp.arp.invflags,

				   invert);

			getlength_and_mask(argv[optind - 1], &cs.arp.arp.arhln,

					   &cs.arp.arp.arhln_mask);

			if (cs.arp.arp.arhln != 6) {

				xtables_error(PARAMETER_PROBLEM,

					      "Only harware address length of"

					      " 6 is supported currently.");

			}

			break;

		case 8: /* was never supported, not even in arptables-legacy */

			xtables_error(PARAMETER_PROBLEM, "not supported");

		case 4:/* opcode */

			check_inverse(optarg, &invert, &optind, argc);

			set_option(&options, OPT_OPCODE, &cs.arp.arp.invflags,

				   invert);

			if (get16_and_mask(argv[optind - 1], &cs.arp.arp.arpop,

					   &cs.arp.arp.arpop_mask, 10)) {

				int i;

				for (i = 0; i < NUMOPCODES; i++)

					if (!strcasecmp(arp_opcodes[i], optarg))

						break;

				if (i == NUMOPCODES)

					xtables_error(PARAMETER_PROBLEM, "Problem with specified opcode");

				cs.arp.arp.arpop = htons(i+1);

			}

			break;

		case 5:/* h-type */

			check_inverse(optarg, &invert, &optind, argc);

			set_option(&options, OPT_H_TYPE, &cs.arp.arp.invflags,

				   invert);

			if (get16_and_mask(argv[optind - 1], &cs.arp.arp.arhrd,

					   &cs.arp.arp.arhrd_mask, 16)) {

				if (strcasecmp(argv[optind-1], "Ethernet"))

					xtables_error(PARAMETER_PROBLEM, "Problem with specified hardware type");

				cs.arp.arp.arhrd = htons(1);

			}

			break;

		case 6:/* proto-type */

			check_inverse(optarg, &invert, &optind, argc);

			set_option(&options, OPT_P_TYPE, &cs.arp.arp.invflags,

				   invert);

			if (get16_and_mask(argv[optind - 1], &cs.arp.arp.arpro,

					   &cs.arp.arp.arpro_mask, 0)) {

				if (strcasecmp(argv[optind-1], "ipv4"))

					xtables_error(PARAMETER_PROBLEM, "Problem with specified protocol type");

				cs.arp.arp.arpro = htons(0x800);

			}

			break;

		case 'j':

			set_option(&options, OPT_JUMP, &cs.arp.arp.invflags,

				   invert);

			command_jump(&cs, optarg);

			break;

		case 'i':

			check_inverse(optarg, &invert, &optind, argc);

			set_option(&options, OPT_VIANAMEIN, &cs.arp.arp.invflags,

				   invert);

			xtables_parse_interface(argv[optind-1],

						cs.arp.arp.iniface,

						cs.arp.arp.iniface_mask);

			break;

		case 'o':

			check_inverse(optarg, &invert, &optind, argc);

			set_option(&options, OPT_VIANAMEOUT, &cs.arp.arp.invflags,

				   invert);

			xtables_parse_interface(argv[optind-1],

						cs.arp.arp.outiface,

						cs.arp.arp.outiface_mask);

			break;

		case 'v':

			if (!verbose)

				set_option(&options, OPT_VERBOSE,

					   &cs.arp.arp.invflags, invert);

			verbose++;

			break;

		case 'm': /* ignored by arptables-legacy */

			break;

		case 'n':

			set_option(&options, OPT_NUMERIC, &cs.arp.arp.invflags,

				   invert);

			break;

		case 't':

			if (invert)

				xtables_error(PARAMETER_PROBLEM,

					      "unexpected ! flag before --table");

			/* ignore this option.

			 * arptables-legacy parses it, but libarptc doesn't use it.

			 * arptables only has a 'filter' table anyway.

			 */

			break;

		case 'V':

			if (invert)

				printf("Not %s ;-)\n", arptables_globals.program_version);

			else

				printf("%s v%s (nf_tables)\n",

				       arptables_globals.program_name,

				       arptables_globals.program_version);

			exit(0);

		case '0':

			set_option(&options, OPT_LINENUMBERS, &cs.arp.arp.invflags,

				   invert);

			break;

		case 'M':

			//modprobe = optarg;

			break;

		case 'c':

			set_option(&options, OPT_COUNTERS, &cs.arp.arp.invflags,

				   invert);

			pcnt = optarg;

			if (xs_has_arg(argc, argv))

				bcnt = argv[optind++];

			else

				xtables_error(PARAMETER_PROBLEM,

					      "-%c requires packet and byte counter",

					      opt2char(OPT_COUNTERS));

			if (sscanf(pcnt, "%llu", &cs.arp.counters.pcnt) != 1)

			xtables_error(PARAMETER_PROBLEM,

				"-%c packet counter not numeric",

				opt2char(OPT_COUNTERS));

			if (sscanf(bcnt, "%llu", &cs.arp.counters.bcnt) != 1)

				xtables_error(PARAMETER_PROBLEM,

					      "-%c byte counter not numeric",

					      opt2char(OPT_COUNTERS));

			break;

		case 1: /* non option */

			if (optarg[0] == '!' && optarg[1] == '\0') {

				if (invert)

					xtables_error(PARAMETER_PROBLEM,

						      "multiple consecutive ! not"

						      " allowed");

				invert = true;

				optarg[0] = '\0';

				continue;

			}

			printf("Bad argument `%s'\n", optarg);

			exit_tryhelp(2);

		default:

			if (cs.target) {

				xtables_option_tpcall(c, argv,

						      invert, cs.target, &cs.arp);

			}

			break;

		}

		invert = false;

	}

	if (cs.target)

		xtables_option_tfcall(cs.target);