/* Code to take an iptables-style command line and do it. */
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/*
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* Author: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au
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*
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* (C) 2000-2002 by the netfilter coreteam <coreteam@netfilter.org>:
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* Paul 'Rusty' Russell <rusty@rustcorp.com.au>
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* Marc Boucher <marc+nf@mbsi.ca>
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* James Morris <jmorris@intercode.com.au>
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* Harald Welte <laforge@gnumonks.org>
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* Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <getopt.h>
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#include <string.h>
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#include <netdb.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <unistd.h>
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#include <iptables.h>
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#include <xtables.h>
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#include <fcntl.h>
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#include "xshared.h"
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#include "nft-shared.h"
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#include "nft.h"
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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#define NUMBER_OF_CMD 16
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static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z',
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'N', 'X', 'P', 'E', 'S', 'Z', 'C' };
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#define OPT_FRAGMENT 0x00800U
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#define NUMBER_OF_OPT ARRAY_SIZE(optflags)
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static const char optflags[]
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= { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', '0', 'c', 'f'};
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static struct option original_opts[] = {
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{.name = "append", .has_arg = 1, .val = 'A'},
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{.name = "delete", .has_arg = 1, .val = 'D'},
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{.name = "check", .has_arg = 1, .val = 'C'},
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{.name = "insert", .has_arg = 1, .val = 'I'},
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{.name = "replace", .has_arg = 1, .val = 'R'},
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{.name = "list", .has_arg = 2, .val = 'L'},
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{.name = "list-rules", .has_arg = 2, .val = 'S'},
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{.name = "flush", .has_arg = 2, .val = 'F'},
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{.name = "zero", .has_arg = 2, .val = 'Z'},
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{.name = "new-chain", .has_arg = 1, .val = 'N'},
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{.name = "delete-chain", .has_arg = 2, .val = 'X'},
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{.name = "rename-chain", .has_arg = 1, .val = 'E'},
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{.name = "policy", .has_arg = 1, .val = 'P'},
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{.name = "source", .has_arg = 1, .val = 's'},
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{.name = "destination", .has_arg = 1, .val = 'd'},
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{.name = "src", .has_arg = 1, .val = 's'}, /* synonym */
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{.name = "dst", .has_arg = 1, .val = 'd'}, /* synonym */
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{.name = "protocol", .has_arg = 1, .val = 'p'},
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{.name = "in-interface", .has_arg = 1, .val = 'i'},
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{.name = "jump", .has_arg = 1, .val = 'j'},
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{.name = "table", .has_arg = 1, .val = 't'},
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{.name = "match", .has_arg = 1, .val = 'm'},
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{.name = "numeric", .has_arg = 0, .val = 'n'},
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{.name = "out-interface", .has_arg = 1, .val = 'o'},
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{.name = "verbose", .has_arg = 0, .val = 'v'},
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{.name = "wait", .has_arg = 2, .val = 'w'},
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{.name = "wait-interval", .has_arg = 2, .val = 'W'},
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{.name = "exact", .has_arg = 0, .val = 'x'},
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{.name = "fragments", .has_arg = 0, .val = 'f'},
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{.name = "version", .has_arg = 0, .val = 'V'},
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{.name = "help", .has_arg = 2, .val = 'h'},
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{.name = "line-numbers", .has_arg = 0, .val = '0'},
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{.name = "modprobe", .has_arg = 1, .val = 'M'},
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{.name = "set-counters", .has_arg = 1, .val = 'c'},
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{.name = "goto", .has_arg = 1, .val = 'g'},
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{.name = "ipv4", .has_arg = 0, .val = '4'},
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{.name = "ipv6", .has_arg = 0, .val = '6'},
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{NULL},
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};
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void xtables_exit_error(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3)));
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struct xtables_globals xtables_globals = {
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.option_offset = 0,
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.program_version = IPTABLES_VERSION,
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.orig_opts = original_opts,
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.exit_err = xtables_exit_error,
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.compat_rev = nft_compatible_revision,
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};
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/* Table of legal combinations of commands and options. If any of the
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* given commands make an option legal, that option is legal (applies to
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* CMD_LIST and CMD_ZERO only).
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* Key:
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* + compulsory
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* x illegal
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* optional
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*/
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static const char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
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/* Well, it's better than "Re: Linux vs FreeBSD" */
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{
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/* -n -s -d -p -j -v -x -i -o --line -c -f */
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/*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' ',' '},
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/*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x',' '},
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/*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x','x'},
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/*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' ',' '},
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/*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' ',' '},
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/*LIST*/ {' ','x','x','x','x',' ',' ','x','x',' ','x','x'},
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/*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
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/*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
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/*ZERO_NUM*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
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/*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
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/*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
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/*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x',' ','x'},
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/*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
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/*LIST_RULES*/{'x','x','x','x','x',' ','x','x','x','x','x','x'},
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/*CHECK*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x',' '},
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};
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static const int inverse_for_options[NUMBER_OF_OPT] =
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{
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/* -n */ 0,
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/* -s */ IPT_INV_SRCIP,
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/* -d */ IPT_INV_DSTIP,
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/* -p */ XT_INV_PROTO,
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/* -j */ 0,
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/* -v */ 0,
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/* -x */ 0,
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/* -i */ IPT_INV_VIA_IN,
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/* -o */ IPT_INV_VIA_OUT,
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/*--line*/ 0,
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/* -c */ 0,
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/* -f */ IPT_INV_FRAG,
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};
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#define opts xtables_globals.opts
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#define prog_name xtables_globals.program_name
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#define prog_vers xtables_globals.program_version
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static void __attribute__((noreturn))
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exit_tryhelp(int status)
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{
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if (line != -1)
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fprintf(stderr, "Error occurred at line: %d\n", line);
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fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
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prog_name, prog_name);
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xtables_free_opts(1);
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exit(status);
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}
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static void
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exit_printhelp(const struct xtables_rule_match *matches)
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{
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printf("%s v%s\n\n"
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"Usage: %s -[ACD] chain rule-specification [options]\n"
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" %s -I chain [rulenum] rule-specification [options]\n"
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" %s -R chain rulenum rule-specification [options]\n"
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" %s -D chain rulenum [options]\n"
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" %s -[LS] [chain [rulenum]] [options]\n"
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" %s -[FZ] [chain] [options]\n"
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" %s -[NX] chain\n"
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" %s -E old-chain-name new-chain-name\n"
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" %s -P chain target [options]\n"
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" %s -h (print this help information)\n\n",
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prog_name, prog_vers, prog_name, prog_name,
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prog_name, prog_name, prog_name, prog_name,
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prog_name, prog_name, prog_name, prog_name);
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printf(
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"Commands:\n"
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"Either long or short options are allowed.\n"
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" --append -A chain Append to chain\n"
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" --check -C chain Check for the existence of a rule\n"
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" --delete -D chain Delete matching rule from chain\n"
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" --delete -D chain rulenum\n"
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" Delete rule rulenum (1 = first) from chain\n"
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" --insert -I chain [rulenum]\n"
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" Insert in chain as rulenum (default 1=first)\n"
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" --replace -R chain rulenum\n"
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" Replace rule rulenum (1 = first) in chain\n"
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" --list -L [chain [rulenum]]\n"
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" List the rules in a chain or all chains\n"
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" --list-rules -S [chain [rulenum]]\n"
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" Print the rules in a chain or all chains\n"
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" --flush -F [chain] Delete all rules in chain or all chains\n"
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" --zero -Z [chain [rulenum]]\n"
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" Zero counters in chain or all chains\n"
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" --new -N chain Create a new user-defined chain\n"
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" --delete-chain\n"
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" -X [chain] Delete a user-defined chain\n"
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" --policy -P chain target\n"
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" Change policy on chain to target\n"
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" --rename-chain\n"
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" -E old-chain new-chain\n"
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" Change chain name, (moving any references)\n"
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"Options:\n"
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" --ipv4 -4 Nothing (line is ignored by ip6tables-restore)\n"
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" --ipv6 -6 Error (line is ignored by iptables-restore)\n"
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"[!] --proto -p proto protocol: by number or name, eg. `tcp'\n"
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"[!] --source -s address[/mask][...]\n"
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" source specification\n"
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"[!] --destination -d address[/mask][...]\n"
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" destination specification\n"
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"[!] --in-interface -i input name[+]\n"
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" network interface name ([+] for wildcard)\n"
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" --jump -j target\n"
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" target for rule (may load target extension)\n"
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#ifdef IPT_F_GOTO
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" --goto -g chain\n"
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" jump to chain with no return\n"
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#endif
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" --match -m match\n"
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" extended match (may load extension)\n"
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" --numeric -n numeric output of addresses and ports\n"
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"[!] --out-interface -o output name[+]\n"
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" network interface name ([+] for wildcard)\n"
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" --table -t table table to manipulate (default: `filter')\n"
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" --verbose -v verbose mode\n"
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" --wait -w [seconds] maximum wait to acquire xtables lock before give up\n"
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" --wait-interval -W [usecs] wait time to try to acquire xtables lock\n"
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" default is 1 second\n"
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" --line-numbers print line numbers when listing\n"
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" --exact -x expand numbers (display exact values)\n"
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"[!] --fragment -f match second or further fragments only\n"
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" --modprobe=<command> try to insert modules using this command\n"
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" --set-counters PKTS BYTES set the counter during insert/append\n"
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"[!] --version -V print package version.\n");
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print_extension_helps(xtables_targets, matches);
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exit(0);
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}
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void
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xtables_exit_error(enum xtables_exittype status, const char *msg, ...)
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{
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va_list args;
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va_start(args, msg);
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fprintf(stderr, "%s v%s: ", prog_name, prog_vers);
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vfprintf(stderr, msg, args);
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va_end(args);
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fprintf(stderr, "\n");
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if (status == PARAMETER_PROBLEM)
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exit_tryhelp(status);
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if (status == VERSION_PROBLEM)
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fprintf(stderr,
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"Perhaps iptables or your kernel needs to be upgraded.\n");
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/* On error paths, make sure that we don't leak memory */
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xtables_free_opts(1);
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exit(status);
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}
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static void
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generic_opt_check(int command, int options)
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{
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int i, j, legal = 0;
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/* Check that commands are valid with options. Complicated by the
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* fact that if an option is legal with *any* command given, it is
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* legal overall (ie. -z and -l).
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*/
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for (i = 0; i < NUMBER_OF_OPT; i++) {
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legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */
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for (j = 0; j < NUMBER_OF_CMD; j++) {
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if (!(command & (1<<j)))
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continue;
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if (!(options & (1<<i))) {
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if (commands_v_options[j][i] == '+')
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xtables_error(PARAMETER_PROBLEM,
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"You need to supply the `-%c' "
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"option for this command\n",
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optflags[i]);
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} else {
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if (commands_v_options[j][i] != 'x')
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legal = 1;
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else if (legal == 0)
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legal = -1;
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}
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}
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if (legal == -1)
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xtables_error(PARAMETER_PROBLEM,
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"Illegal option `-%c' with this command\n",
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optflags[i]);
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}
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}
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static char
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opt2char(int option)
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{
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const char *ptr;
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for (ptr = optflags; option > 1; option >>= 1, ptr++);
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return *ptr;
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}
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static char
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cmd2char(int option)
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{
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const char *ptr;
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for (ptr = cmdflags; option > 1; option >>= 1, ptr++);
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return *ptr;
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}
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static void
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add_command(unsigned int *cmd, const int newcmd, const int othercmds,
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int invert)
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{
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if (invert)
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xtables_error(PARAMETER_PROBLEM, "unexpected ! flag");
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if (*cmd & (~othercmds))
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xtables_error(PARAMETER_PROBLEM, "Cannot use -%c with -%c\n",
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cmd2char(newcmd), cmd2char(*cmd & (~othercmds)));
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*cmd |= newcmd;
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}
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/*
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* All functions starting with "parse" should succeed, otherwise
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* the program fails.
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* Most routines return pointers to static data that may change
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* between calls to the same or other routines with a few exceptions:
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* "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask"
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* return global static data.
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*/
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/* Christophe Burki wants `-p 6' to imply `-m tcp'. */
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/* Can't be zero. */
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static int
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parse_rulenumber(const char *rule)
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{
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unsigned int rulenum;
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if (!xtables_strtoui(rule, NULL, &rulenum, 1, INT_MAX))
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xtables_error(PARAMETER_PROBLEM,
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"Invalid rule number `%s'", rule);
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return rulenum;
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}
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static const char *
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parse_target(const char *targetname)
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{
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const char *ptr;
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if (strlen(targetname) < 1)
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xtables_error(PARAMETER_PROBLEM,
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"Invalid target name (too short)");
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if (strlen(targetname) >= XT_EXTENSION_MAXNAMELEN)
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xtables_error(PARAMETER_PROBLEM,
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"Invalid target name `%s' (%u chars max)",
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targetname, XT_EXTENSION_MAXNAMELEN - 1);
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for (ptr = targetname; *ptr; ptr++)
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if (isspace(*ptr))
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xtables_error(PARAMETER_PROBLEM,
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"Invalid target name `%s'", targetname);
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return targetname;
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}
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static void
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set_option(unsigned int *options, unsigned int option, uint8_t *invflg,
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int invert)
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{
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if (*options & option)
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xtables_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed",
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opt2char(option));
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*options |= option;
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if (invert) {
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unsigned int i;
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for (i = 0; 1 << i != option; i++);
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if (!inverse_for_options[i])
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xtables_error(PARAMETER_PROBLEM,
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"cannot have ! before -%c",
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opt2char(option));
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*invflg |= inverse_for_options[i];
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}
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}
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static int
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add_entry(const char *chain,
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const char *table,
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struct iptables_command_state *cs,
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int rulenum, int family,
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const struct addr_mask s,
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const struct addr_mask d,
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bool verbose, struct nft_handle *h, bool append)
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{
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unsigned int i, j;
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int ret = 1;
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for (i = 0; i < s.naddrs; i++) {
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if (family == AF_INET) {
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cs->fw.ip.src.s_addr = s.addr.v4[i].s_addr;
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cs->fw.ip.smsk.s_addr = s.mask.v4[i].s_addr;
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for (j = 0; j < d.naddrs; j++) {
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cs->fw.ip.dst.s_addr = d.addr.v4[j].s_addr;
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cs->fw.ip.dmsk.s_addr = d.mask.v4[j].s_addr;
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if (append) {
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ret = nft_rule_append(h, chain, table,
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cs, 0,
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verbose);
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} else {
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ret = nft_rule_insert(h, chain, table,
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cs, rulenum,
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verbose);
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}
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}
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} else if (family == AF_INET6) {
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memcpy(&cs->fw6.ipv6.src,
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&s.addr.v6[i], sizeof(struct in6_addr));
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memcpy(&cs->fw6.ipv6.smsk,
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&s.mask.v6[i], sizeof(struct in6_addr));
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for (j = 0; j < d.naddrs; j++) {
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memcpy(&cs->fw6.ipv6.dst,
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&d.addr.v6[j], sizeof(struct in6_addr));
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memcpy(&cs->fw6.ipv6.dmsk,
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&d.mask.v6[j], sizeof(struct in6_addr));
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if (append) {
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ret = nft_rule_append(h, chain, table,
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cs, 0,
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verbose);
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} else {
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ret = nft_rule_insert(h, chain, table,
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cs, rulenum,
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verbose);
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}
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}
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}
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}
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return ret;
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}
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static int
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replace_entry(const char *chain, const char *table,
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struct iptables_command_state *cs,
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unsigned int rulenum,
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int family,
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const struct addr_mask s,
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const struct addr_mask d,
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bool verbose, struct nft_handle *h)
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{
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if (family == AF_INET) {
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cs->fw.ip.src.s_addr = s.addr.v4->s_addr;
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cs->fw.ip.dst.s_addr = d.addr.v4->s_addr;
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cs->fw.ip.smsk.s_addr = s.mask.v4->s_addr;
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cs->fw.ip.dmsk.s_addr = d.mask.v4->s_addr;
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} else if (family == AF_INET6) {
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memcpy(&cs->fw6.ipv6.src, s.addr.v6, sizeof(struct in6_addr));
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memcpy(&cs->fw6.ipv6.dst, d.addr.v6, sizeof(struct in6_addr));
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memcpy(&cs->fw6.ipv6.smsk, s.mask.v6, sizeof(struct in6_addr));
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memcpy(&cs->fw6.ipv6.dmsk, d.mask.v6, sizeof(struct in6_addr));
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} else
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return 1;
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return nft_rule_replace(h, chain, table, cs, rulenum, verbose);
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}
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static int
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delete_entry(const char *chain, const char *table,
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struct iptables_command_state *cs,
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int family,
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const struct addr_mask s,
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const struct addr_mask d,
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bool verbose,
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struct nft_handle *h)
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{
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unsigned int i, j;
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int ret = 1;
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for (i = 0; i < s.naddrs; i++) {
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if (family == AF_INET) {
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cs->fw.ip.src.s_addr = s.addr.v4[i].s_addr;
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cs->fw.ip.smsk.s_addr = s.mask.v4[i].s_addr;
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for (j = 0; j < d.naddrs; j++) {
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cs->fw.ip.dst.s_addr = d.addr.v4[j].s_addr;
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cs->fw.ip.dmsk.s_addr = d.mask.v4[j].s_addr;
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ret = nft_rule_delete(h, chain,
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table, cs, verbose);
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}
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} else if (family == AF_INET6) {
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memcpy(&cs->fw6.ipv6.src,
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&s.addr.v6[i], sizeof(struct in6_addr));
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memcpy(&cs->fw6.ipv6.smsk,
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&s.mask.v6[i], sizeof(struct in6_addr));
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for (j = 0; j < d.naddrs; j++) {
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memcpy(&cs->fw6.ipv6.dst,
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&d.addr.v6[j], sizeof(struct in6_addr));
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memcpy(&cs->fw6.ipv6.dmsk,
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&d.mask.v6[j], sizeof(struct in6_addr));
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ret = nft_rule_delete(h, chain,
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table, cs, verbose);
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}
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}
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}
|
|
return ret;
|
}
|
|
static int
|
check_entry(const char *chain, const char *table,
|
struct iptables_command_state *cs,
|
int family,
|
const struct addr_mask s,
|
const struct addr_mask d,
|
bool verbose, struct nft_handle *h)
|
{
|
unsigned int i, j;
|
int ret = 1;
|
|
for (i = 0; i < s.naddrs; i++) {
|
if (family == AF_INET) {
|
cs->fw.ip.src.s_addr = s.addr.v4[i].s_addr;
|
cs->fw.ip.smsk.s_addr = s.mask.v4[i].s_addr;
|
for (j = 0; j < d.naddrs; j++) {
|
cs->fw.ip.dst.s_addr = d.addr.v4[j].s_addr;
|
cs->fw.ip.dmsk.s_addr = d.mask.v4[j].s_addr;
|
ret = nft_rule_check(h, chain,
|
table, cs, verbose);
|
}
|
} else if (family == AF_INET6) {
|
memcpy(&cs->fw6.ipv6.src,
|
&s.addr.v6[i], sizeof(struct in6_addr));
|
memcpy(&cs->fw6.ipv6.smsk,
|
&s.mask.v6[i], sizeof(struct in6_addr));
|
for (j = 0; j < d.naddrs; j++) {
|
memcpy(&cs->fw6.ipv6.dst,
|
&d.addr.v6[j], sizeof(struct in6_addr));
|
memcpy(&cs->fw6.ipv6.dmsk,
|
&d.mask.v6[j], sizeof(struct in6_addr));
|
ret = nft_rule_check(h, chain,
|
table, cs, verbose);
|
}
|
}
|
}
|
|
return ret;
|
}
|
|
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
|
list_rules(struct nft_handle *h, const char *chain, const char *table,
|
int rulenum, int counters)
|
{
|
if (counters)
|
counters = -1; /* iptables -c format */
|
|
nft_rule_list_save(h, chain, table, rulenum, counters);
|
|
/* iptables does not return error if rule number not found */
|
return 1;
|
}
|
|
static void command_jump(struct iptables_command_state *cs)
|
{
|
size_t size;
|
|
set_option(&cs->options, OPT_JUMP, &cs->fw.ip.invflags, cs->invert);
|
cs->jumpto = parse_target(optarg);
|
/* TRY_LOAD (may be chain name) */
|
cs->target = xtables_find_target(cs->jumpto, XTF_TRY_LOAD);
|
|
if (cs->target == NULL)
|
return;
|
|
size = XT_ALIGN(sizeof(struct xt_entry_target))
|
+ cs->target->size;
|
|
cs->target->t = xtables_calloc(1, size);
|
cs->target->t->u.target_size = size;
|
if (cs->target->real_name == NULL) {
|
strcpy(cs->target->t->u.user.name, cs->jumpto);
|
} else {
|
/* Alias support for userspace side */
|
strcpy(cs->target->t->u.user.name, cs->target->real_name);
|
if (!(cs->target->ext_flags & XTABLES_EXT_ALIAS))
|
fprintf(stderr, "Notice: The %s target is converted into %s target "
|
"in rule listing and saving.\n",
|
cs->jumpto, cs->target->real_name);
|
}
|
cs->target->t->u.user.revision = cs->target->revision;
|
xs_init_target(cs->target);
|
|
if (cs->target->x6_options != NULL)
|
opts = xtables_options_xfrm(xtables_globals.orig_opts, opts,
|
cs->target->x6_options,
|
&cs->target->option_offset);
|
else
|
opts = xtables_merge_options(xtables_globals.orig_opts, opts,
|
cs->target->extra_opts,
|
&cs->target->option_offset);
|
if (opts == NULL)
|
xtables_error(OTHER_PROBLEM, "can't alloc memory!");
|
}
|
|
static void command_match(struct iptables_command_state *cs)
|
{
|
struct xtables_match *m;
|
size_t size;
|
|
if (cs->invert)
|
xtables_error(PARAMETER_PROBLEM,
|
"unexpected ! flag before --match");
|
|
m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, &cs->matches);
|
size = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
|
m->m = xtables_calloc(1, size);
|
m->m->u.match_size = size;
|
if (m->real_name == NULL) {
|
strcpy(m->m->u.user.name, m->name);
|
} else {
|
strcpy(m->m->u.user.name, m->real_name);
|
if (!(m->ext_flags & XTABLES_EXT_ALIAS))
|
fprintf(stderr, "Notice: the %s match is converted into %s match "
|
"in rule listing and saving.\n", m->name, m->real_name);
|
}
|
m->m->u.user.revision = m->revision;
|
xs_init_match(m);
|
if (m == m->next)
|
return;
|
/* Merge options for non-cloned matches */
|
if (m->x6_options != NULL)
|
opts = xtables_options_xfrm(xtables_globals.orig_opts, opts,
|
m->x6_options, &m->option_offset);
|
else if (m->extra_opts != NULL)
|
opts = xtables_merge_options(xtables_globals.orig_opts, opts,
|
m->extra_opts, &m->option_offset);
|
if (opts == NULL)
|
xtables_error(OTHER_PROBLEM, "can't alloc memory!");
|
}
|
|
void do_parse(struct nft_handle *h, int argc, char *argv[],
|
struct nft_xt_cmd_parse *p, struct iptables_command_state *cs,
|
struct xtables_args *args)
|
{
|
struct xtables_match *m;
|
struct xtables_rule_match *matchp;
|
bool wait_interval_set = false;
|
struct timeval wait_interval;
|
struct xtables_target *t;
|
int wait = 0;
|
|
memset(cs, 0, sizeof(*cs));
|
cs->jumpto = "";
|
cs->argv = argv;
|
|
/* re-set optind to 0 in case do_command4 gets called
|
* a second time */
|
optind = 0;
|
|
/* clear mflags in case do_command4 gets called a second time
|
* (we clear the global list of all matches for security)*/
|
for (m = xtables_matches; m; m = m->next)
|
m->mflags = 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;
|
|
h->ops = nft_family_ops_lookup(h->family);
|
if (h->ops == NULL)
|
xtables_error(PARAMETER_PROBLEM, "Unknown family");
|
|
opts = xt_params->orig_opts;
|
while ((cs->c = getopt_long(argc, argv,
|
"-:A:C:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvw::W::nt:m:xc:g:46",
|
opts, NULL)) != -1) {
|
switch (cs->c) {
|
/*
|
* Command selection
|
*/
|
case 'A':
|
add_command(&p->command, CMD_APPEND, CMD_NONE,
|
cs->invert);
|
p->chain = optarg;
|
break;
|
|
case 'C':
|
add_command(&p->command, CMD_CHECK, CMD_NONE,
|
cs->invert);
|
p->chain = optarg;
|
break;
|
|
case 'D':
|
add_command(&p->command, CMD_DELETE, CMD_NONE,
|
cs->invert);
|
p->chain = optarg;
|
if (xs_has_arg(argc, argv)) {
|
p->rulenum = parse_rulenumber(argv[optind++]);
|
p->command = CMD_DELETE_NUM;
|
}
|
break;
|
|
case 'R':
|
add_command(&p->command, CMD_REPLACE, CMD_NONE,
|
cs->invert);
|
p->chain = optarg;
|
if (xs_has_arg(argc, argv))
|
p->rulenum = parse_rulenumber(argv[optind++]);
|
else
|
xtables_error(PARAMETER_PROBLEM,
|
"-%c requires a rule number",
|
cmd2char(CMD_REPLACE));
|
break;
|
|
case 'I':
|
add_command(&p->command, CMD_INSERT, CMD_NONE,
|
cs->invert);
|
p->chain = optarg;
|
if (xs_has_arg(argc, argv))
|
p->rulenum = parse_rulenumber(argv[optind++]);
|
else
|
p->rulenum = 1;
|
break;
|
|
case 'L':
|
add_command(&p->command, CMD_LIST,
|
CMD_ZERO | CMD_ZERO_NUM, cs->invert);
|
if (optarg)
|
p->chain = optarg;
|
else if (xs_has_arg(argc, argv))
|
p->chain = argv[optind++];
|
if (xs_has_arg(argc, argv))
|
p->rulenum = parse_rulenumber(argv[optind++]);
|
break;
|
|
case 'S':
|
add_command(&p->command, CMD_LIST_RULES,
|
CMD_ZERO|CMD_ZERO_NUM, cs->invert);
|
if (optarg)
|
p->chain = optarg;
|
else if (xs_has_arg(argc, argv))
|
p->chain = argv[optind++];
|
if (xs_has_arg(argc, argv))
|
p->rulenum = parse_rulenumber(argv[optind++]);
|
break;
|
|
case 'F':
|
add_command(&p->command, CMD_FLUSH, CMD_NONE,
|
cs->invert);
|
if (optarg)
|
p->chain = optarg;
|
else if (xs_has_arg(argc, argv))
|
p->chain = argv[optind++];
|
break;
|
|
case 'Z':
|
add_command(&p->command, CMD_ZERO,
|
CMD_LIST|CMD_LIST_RULES, cs->invert);
|
if (optarg)
|
p->chain = optarg;
|
else if (xs_has_arg(argc, argv))
|
p->chain = argv[optind++];
|
if (xs_has_arg(argc, argv)) {
|
p->rulenum = parse_rulenumber(argv[optind++]);
|
p->command = CMD_ZERO_NUM;
|
}
|
break;
|
|
case 'N':
|
if (optarg && (*optarg == '-' || *optarg == '!'))
|
xtables_error(PARAMETER_PROBLEM,
|
"chain name not allowed to start "
|
"with `%c'\n", *optarg);
|
if (xtables_find_target(optarg, XTF_TRY_LOAD))
|
xtables_error(PARAMETER_PROBLEM,
|
"chain name may not clash "
|
"with target name\n");
|
add_command(&p->command, CMD_NEW_CHAIN, CMD_NONE,
|
cs->invert);
|
p->chain = optarg;
|
break;
|
|
case 'X':
|
add_command(&p->command, CMD_DELETE_CHAIN, CMD_NONE,
|
cs->invert);
|
if (optarg)
|
p->chain = optarg;
|
else if (xs_has_arg(argc, argv))
|
p->chain = argv[optind++];
|
break;
|
|
case 'E':
|
add_command(&p->command, CMD_RENAME_CHAIN, CMD_NONE,
|
cs->invert);
|
p->chain = optarg;
|
if (xs_has_arg(argc, argv))
|
p->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(&p->command, CMD_SET_POLICY, CMD_NONE,
|
cs->invert);
|
p->chain = optarg;
|
if (xs_has_arg(argc, argv))
|
p->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];
|
|
/* iptables -p icmp -h */
|
if (!cs->matches && cs->protocol)
|
xtables_find_match(cs->protocol,
|
XTF_TRY_LOAD, &cs->matches);
|
|
exit_printhelp(cs->matches);
|
|
/*
|
* Option selection
|
*/
|
case 'p':
|
set_option(&cs->options, OPT_PROTOCOL,
|
&args->invflags, cs->invert);
|
|
/* Canonicalize into lower case */
|
for (cs->protocol = optarg; *cs->protocol; cs->protocol++)
|
*cs->protocol = tolower(*cs->protocol);
|
|
cs->protocol = optarg;
|
args->proto = xtables_parse_protocol(cs->protocol);
|
|
if (args->proto == 0 &&
|
(args->invflags & XT_INV_PROTO))
|
xtables_error(PARAMETER_PROBLEM,
|
"rule would never match protocol");
|
|
/* This needs to happen here to parse extensions */
|
h->ops->proto_parse(cs, args);
|
break;
|
|
case 's':
|
set_option(&cs->options, OPT_SOURCE,
|
&args->invflags, cs->invert);
|
args->shostnetworkmask = optarg;
|
break;
|
|
case 'd':
|
set_option(&cs->options, OPT_DESTINATION,
|
&args->invflags, cs->invert);
|
args->dhostnetworkmask = optarg;
|
break;
|
|
#ifdef IPT_F_GOTO
|
case 'g':
|
set_option(&cs->options, OPT_JUMP, &args->invflags,
|
cs->invert);
|
args->goto_set = true;
|
cs->jumpto = parse_target(optarg);
|
break;
|
#endif
|
|
case 'j':
|
command_jump(cs);
|
break;
|
|
|
case 'i':
|
if (*optarg == '\0')
|
xtables_error(PARAMETER_PROBLEM,
|
"Empty interface is likely to be "
|
"undesired");
|
set_option(&cs->options, OPT_VIANAMEIN,
|
&args->invflags, cs->invert);
|
xtables_parse_interface(optarg,
|
args->iniface,
|
args->iniface_mask);
|
break;
|
|
case 'o':
|
if (*optarg == '\0')
|
xtables_error(PARAMETER_PROBLEM,
|
"Empty interface is likely to be "
|
"undesired");
|
set_option(&cs->options, OPT_VIANAMEOUT,
|
&args->invflags, cs->invert);
|
xtables_parse_interface(optarg,
|
args->outiface,
|
args->outiface_mask);
|
break;
|
|
case 'f':
|
if (args->family == AF_INET6) {
|
xtables_error(PARAMETER_PROBLEM,
|
"`-f' is not supported in IPv6, "
|
"use -m frag instead");
|
}
|
set_option(&cs->options, OPT_FRAGMENT, &args->invflags,
|
cs->invert);
|
args->flags |= IPT_F_FRAG;
|
break;
|
|
case 'v':
|
if (!p->verbose)
|
set_option(&cs->options, OPT_VERBOSE,
|
&args->invflags, cs->invert);
|
p->verbose++;
|
break;
|
|
case 'm':
|
command_match(cs);
|
break;
|
|
case 'n':
|
set_option(&cs->options, OPT_NUMERIC, &args->invflags,
|
cs->invert);
|
break;
|
|
case 't':
|
if (cs->invert)
|
xtables_error(PARAMETER_PROBLEM,
|
"unexpected ! flag before --table");
|
p->table = optarg;
|
break;
|
|
case 'x':
|
set_option(&cs->options, OPT_EXPANDED, &args->invflags,
|
cs->invert);
|
break;
|
|
case 'V':
|
if (cs->invert)
|
printf("Not %s ;-)\n", prog_vers);
|
else
|
printf("%s v%s\n",
|
prog_name, prog_vers);
|
exit(0);
|
|
case 'w':
|
if (p->restore) {
|
xtables_error(PARAMETER_PROBLEM,
|
"You cannot use `-w' from "
|
"iptables-restore");
|
}
|
|
wait = parse_wait_time(argc, argv);
|
break;
|
|
case 'W':
|
if (p->restore) {
|
xtables_error(PARAMETER_PROBLEM,
|
"You cannot use `-W' from "
|
"iptables-restore");
|
}
|
|
parse_wait_interval(argc, argv, &wait_interval);
|
wait_interval_set = true;
|
break;
|
|
case '0':
|
set_option(&cs->options, OPT_LINENUMBERS,
|
&args->invflags, cs->invert);
|
break;
|
|
case 'M':
|
xtables_modprobe_program = optarg;
|
break;
|
|
case 'c':
|
set_option(&cs->options, OPT_COUNTERS, &args->invflags,
|
cs->invert);
|
args->pcnt = optarg;
|
args->bcnt = strchr(args->pcnt + 1, ',');
|
if (args->bcnt)
|
args->bcnt++;
|
if (!args->bcnt && xs_has_arg(argc, argv))
|
args->bcnt = argv[optind++];
|
if (!args->bcnt)
|
xtables_error(PARAMETER_PROBLEM,
|
"-%c requires packet and byte counter",
|
opt2char(OPT_COUNTERS));
|
|
if (sscanf(args->pcnt, "%llu", &args->pcnt_cnt) != 1)
|
xtables_error(PARAMETER_PROBLEM,
|
"-%c packet counter not numeric",
|
opt2char(OPT_COUNTERS));
|
|
if (sscanf(args->bcnt, "%llu", &args->bcnt_cnt) != 1)
|
xtables_error(PARAMETER_PROBLEM,
|
"-%c byte counter not numeric",
|
opt2char(OPT_COUNTERS));
|
break;
|
|
case '4':
|
if (args->family != AF_INET)
|
exit_tryhelp(2);
|
|
h->ops = nft_family_ops_lookup(args->family);
|
break;
|
|
case '6':
|
args->family = AF_INET6;
|
xtables_set_nfproto(AF_INET6);
|
|
h->ops = nft_family_ops_lookup(args->family);
|
if (h->ops == NULL)
|
xtables_error(PARAMETER_PROBLEM,
|
"Unknown family");
|
break;
|
|
case 1: /* non option */
|
if (optarg[0] == '!' && optarg[1] == '\0') {
|
if (cs->invert)
|
xtables_error(PARAMETER_PROBLEM,
|
"multiple consecutive ! not"
|
" allowed");
|
cs->invert = TRUE;
|
optarg[0] = '\0';
|
continue;
|
}
|
fprintf(stderr, "Bad argument `%s'\n", optarg);
|
exit_tryhelp(2);
|
|
default:
|
if (command_default(cs, &xtables_globals) == 1)
|
/* cf. ip6tables.c */
|
continue;
|
break;
|
}
|
cs->invert = FALSE;
|
}
|
|
if (strcmp(p->table, "nat") == 0 &&
|
((p->policy != NULL && strcmp(p->policy, "DROP") == 0) ||
|
(cs->jumpto != NULL && strcmp(cs->jumpto, "DROP") == 0)))
|
xtables_error(PARAMETER_PROBLEM,
|
"\nThe \"nat\" table is not intended for filtering, "
|
"the use of DROP is therefore inhibited.\n\n");
|
|
if (!wait && wait_interval_set)
|
xtables_error(PARAMETER_PROBLEM,
|
"--wait-interval only makes sense with --wait\n");
|
|
for (matchp = cs->matches; matchp; matchp = matchp->next)
|
xtables_option_mfcall(matchp->match);
|
if (cs->target != NULL)
|
xtables_option_tfcall(cs->target);
|
|
/* Fix me: must put inverse options checking here --MN */
|
|
if (optind < argc)
|
xtables_error(PARAMETER_PROBLEM,
|
"unknown arguments found on commandline");
|
if (!p->command)
|
xtables_error(PARAMETER_PROBLEM, "no command specified");
|
if (cs->invert)
|
xtables_error(PARAMETER_PROBLEM,
|
"nothing appropriate following !");
|
|
/* Set only if required, needed by xtables-restore */
|
if (h->family == AF_UNSPEC)
|
h->family = args->family;
|
|
h->ops->post_parse(p->command, cs, args);
|
|
if (p->command == CMD_REPLACE &&
|
(args->s.naddrs != 1 || args->d.naddrs != 1))
|
xtables_error(PARAMETER_PROBLEM, "Replacement rule does not "
|
"specify a unique address");
|
|
generic_opt_check(p->command, cs->options);
|
|
if (p->chain != NULL && strlen(p->chain) >= XT_EXTENSION_MAXNAMELEN)
|
xtables_error(PARAMETER_PROBLEM,
|
"chain name `%s' too long (must be under %u chars)",
|
p->chain, XT_EXTENSION_MAXNAMELEN);
|
|
if (p->command == CMD_APPEND ||
|
p->command == CMD_DELETE ||
|
p->command == CMD_CHECK ||
|
p->command == CMD_INSERT ||
|
p->command == CMD_REPLACE) {
|
if (strcmp(p->chain, "PREROUTING") == 0
|
|| strcmp(p->chain, "INPUT") == 0) {
|
/* -o not valid with incoming packets. */
|
if (cs->options & OPT_VIANAMEOUT)
|
xtables_error(PARAMETER_PROBLEM,
|
"Can't use -%c with %s\n",
|
opt2char(OPT_VIANAMEOUT),
|
p->chain);
|
}
|
|
if (strcmp(p->chain, "POSTROUTING") == 0
|
|| strcmp(p->chain, "OUTPUT") == 0) {
|
/* -i not valid with outgoing packets */
|
if (cs->options & OPT_VIANAMEIN)
|
xtables_error(PARAMETER_PROBLEM,
|
"Can't use -%c with %s\n",
|
opt2char(OPT_VIANAMEIN),
|
p->chain);
|
}
|
|
/*
|
* Contrary to what iptables does, we assume that any jumpto
|
* is a custom chain jumps (if no target is found). Later on,
|
* nf_table will spot the error if the chain does not exists.
|
*/
|
}
|
}
|
|
int do_commandx(struct nft_handle *h, int argc, char *argv[], char **table,
|
bool restore)
|
{
|
int ret = 1;
|
struct nft_xt_cmd_parse p = {
|
.table = *table,
|
.restore = restore,
|
};
|
struct iptables_command_state cs;
|
struct xtables_args args = {
|
.family = h->family,
|
};
|
|
do_parse(h, argc, argv, &p, &cs, &args);
|
|
switch (p.command) {
|
case CMD_APPEND:
|
ret = add_entry(p.chain, p.table, &cs, 0, h->family,
|
args.s, args.d,
|
cs.options & OPT_VERBOSE, h, true);
|
break;
|
case CMD_DELETE:
|
ret = delete_entry(p.chain, p.table, &cs, h->family,
|
args.s, args.d,
|
cs.options & OPT_VERBOSE, h);
|
break;
|
case CMD_DELETE_NUM:
|
ret = nft_rule_delete_num(h, p.chain, p.table,
|
p.rulenum - 1, p.verbose);
|
break;
|
case CMD_CHECK:
|
ret = check_entry(p.chain, p.table, &cs, h->family,
|
args.s, args.d,
|
cs.options & OPT_VERBOSE, h);
|
break;
|
case CMD_REPLACE:
|
ret = replace_entry(p.chain, p.table, &cs, p.rulenum - 1,
|
h->family, args.s, args.d,
|
cs.options & OPT_VERBOSE, h);
|
break;
|
case CMD_INSERT:
|
ret = add_entry(p.chain, p.table, &cs, p.rulenum - 1,
|
h->family, args.s, args.d,
|
cs.options&OPT_VERBOSE, h, false);
|
break;
|
case CMD_FLUSH:
|
ret = nft_rule_flush(h, p.chain, p.table);
|
break;
|
case CMD_ZERO:
|
ret = nft_chain_zero_counters(h, p.chain, p.table);
|
break;
|
case CMD_ZERO_NUM:
|
ret = nft_rule_zero_counters(h, p.chain, p.table,
|
p.rulenum - 1);
|
break;
|
case CMD_LIST:
|
case CMD_LIST|CMD_ZERO:
|
case CMD_LIST|CMD_ZERO_NUM:
|
if (nft_is_ruleset_compatible(h) == 1) {
|
printf("ERROR: You're using nft features that cannot be mapped to iptables, please keep using nft.\n");
|
exit(EXIT_FAILURE);
|
}
|
|
ret = list_entries(h, p.chain, p.table, p.rulenum,
|
cs.options & OPT_VERBOSE,
|
cs.options & OPT_NUMERIC,
|
cs.options & OPT_EXPANDED,
|
cs.options & OPT_LINENUMBERS);
|
if (ret && (p.command & CMD_ZERO)) {
|
ret = nft_chain_zero_counters(h, p.chain,
|
p.table);
|
}
|
if (ret && (p.command & CMD_ZERO_NUM)) {
|
ret = nft_rule_zero_counters(h, p.chain, p.table,
|
p.rulenum - 1);
|
}
|
break;
|
case CMD_LIST_RULES:
|
case CMD_LIST_RULES|CMD_ZERO:
|
case CMD_LIST_RULES|CMD_ZERO_NUM:
|
ret = list_rules(h, p.chain, p.table, p.rulenum,
|
cs.options & OPT_VERBOSE);
|
if (ret && (p.command & CMD_ZERO)) {
|
ret = nft_chain_zero_counters(h, p.chain,
|
p.table);
|
}
|
if (ret && (p.command & CMD_ZERO_NUM)) {
|
ret = nft_rule_zero_counters(h, p.chain, p.table,
|
p.rulenum - 1);
|
}
|
break;
|
case CMD_NEW_CHAIN:
|
ret = nft_chain_user_add(h, p.chain, p.table);
|
break;
|
case CMD_DELETE_CHAIN:
|
ret = nft_chain_user_del(h, p.chain, p.table);
|
break;
|
case CMD_RENAME_CHAIN:
|
ret = nft_chain_user_rename(h, p.chain, p.table, p.newname);
|
break;
|
case CMD_SET_POLICY:
|
ret = nft_chain_set(h, p.table, p.chain, p.policy, NULL);
|
if (ret < 0)
|
xtables_error(PARAMETER_PROBLEM, "Wrong policy `%s'\n",
|
p.policy);
|
break;
|
default:
|
/* We should never reach this... */
|
exit_tryhelp(2);
|
}
|
|
*table = p.table;
|
|
xtables_rule_matches_free(&cs.matches);
|
|
if (h->family == AF_INET) {
|
free(args.s.addr.v4);
|
free(args.s.mask.v4);
|
free(args.d.addr.v4);
|
free(args.d.mask.v4);
|
} else if (h->family == AF_INET6) {
|
free(args.s.addr.v6);
|
free(args.s.mask.v6);
|
free(args.d.addr.v6);
|
free(args.d.mask.v6);
|
}
|
xtables_free_opts(1);
|
|
return ret;
|
}
|
