Blame tc/m_ipt.c

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/*
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 * m_ipt.c	iptables based targets
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 *		utilities mostly ripped from iptables <duh, its the linux way>
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 *
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 *		This program is free software; you can distribute it and/or
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 *		modify it under the terms of the GNU General Public License
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 *		as published by the Free Software Foundation; either version
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 *		2 of the License, or (at your option) any later version.
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 *
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 * Authors:  J Hadi Salim (hadi@cyberus.ca)
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 */
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <iptables.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include "utils.h"
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#include "tc_util.h"
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#include <linux/tc_act/tc_ipt.h>
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#include <stdio.h>
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#include <dlfcn.h>
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#include <getopt.h>
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#include <errno.h>
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#include <string.h>
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#include <netdb.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 <unistd.h>
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#include <fcntl.h>
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#include <sys/wait.h>
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static const char *pname = "tc-ipt";
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static const char *tname = "mangle";
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static const char *pversion = "0.1";
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static const char *ipthooks[] = {
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	"NF_IP_PRE_ROUTING",
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	"NF_IP_LOCAL_IN",
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	"NF_IP_FORWARD",
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	"NF_IP_LOCAL_OUT",
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	"NF_IP_POST_ROUTING",
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};
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static struct option original_opts[] = {
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	{"jump", 1, 0, 'j'},
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	{0, 0, 0, 0}
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};
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static struct xtables_target *t_list;
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static struct option *opts = original_opts;
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static unsigned int global_option_offset;
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#define OPTION_OFFSET 256
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char *lib_dir;
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void
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xtables_register_target(struct xtables_target *me)
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{
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	me->next = t_list;
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	t_list = me;
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}
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static void exit_tryhelp(int status)
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{
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	fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
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		pname, pname);
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	exit(status);
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}
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static void exit_error(enum xtables_exittype status, 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: ", pname, pversion);
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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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	exit(status);
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}
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/* stolen from iptables 1.2.11
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They should really have them as a library so i can link to them
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Email them next time i remember
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*/
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static void free_opts(struct option *local_opts)
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{
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	if (local_opts != original_opts) {
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		free(local_opts);
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		opts = original_opts;
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		global_option_offset = 0;
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	}
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}
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static struct option *
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merge_options(struct option *oldopts, const struct option *newopts,
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	      unsigned int *option_offset)
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{
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	struct option *merge;
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	unsigned int num_old, num_new, i;
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	for (num_old = 0; oldopts[num_old].name; num_old++);
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	for (num_new = 0; newopts[num_new].name; num_new++);
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	*option_offset = global_option_offset + OPTION_OFFSET;
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	merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
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	memcpy(merge, oldopts, num_old * sizeof(struct option));
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	for (i = 0; i < num_new; i++) {
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		merge[num_old + i] = newopts[i];
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		merge[num_old + i].val += *option_offset;
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	}
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	memset(merge + num_old + num_new, 0, sizeof(struct option));
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	return merge;
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}
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static void *
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fw_calloc(size_t count, size_t size)
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{
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	void *p;
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	if ((p = (void *) calloc(count, size)) == NULL) {
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		perror("iptables: calloc failed");
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		exit(1);
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	}
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	return p;
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}
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static struct xtables_target *
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find_t(char *name)
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{
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	struct xtables_target *m;
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	for (m = t_list; m; m = m->next) {
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		if (strcmp(m->name, name) == 0)
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			return m;
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	}
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	return NULL;
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}
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static struct xtables_target *
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get_target_name(const char *name)
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{
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	void *handle;
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	char *error;
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	char *new_name, *lname;
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	struct xtables_target *m;
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	char path[strlen(lib_dir) + sizeof("/libipt_.so") + strlen(name)];
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#ifdef NO_SHARED_LIBS
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	return NULL;
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#endif
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	new_name = calloc(1, strlen(name) + 1);
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	lname = calloc(1, strlen(name) + 1);
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	if (!new_name)
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		exit_error(PARAMETER_PROBLEM, "get_target_name");
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	if (!lname)
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		exit_error(PARAMETER_PROBLEM, "get_target_name");
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	strcpy(new_name, name);
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	strcpy(lname, name);
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	if (isupper(lname[0])) {
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		int i;
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		for (i = 0; i < strlen(name); i++) {
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			lname[i] = tolower(lname[i]);
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		}
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	}
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	if (islower(new_name[0])) {
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		int i;
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		for (i = 0; i < strlen(new_name); i++) {
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			new_name[i] = toupper(new_name[i]);
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		}
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	}
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	/* try libxt_xx first */
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	sprintf(path, "%s/libxt_%s.so", lib_dir, new_name);
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	handle = dlopen(path, RTLD_LAZY);
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	if (!handle) {
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		/* try libipt_xx next */
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		sprintf(path, "%s/libipt_%s.so", lib_dir, new_name);
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		handle = dlopen(path, RTLD_LAZY);
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		if (!handle) {
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			sprintf(path, "%s/libxt_%s.so", lib_dir, lname);
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			handle = dlopen(path, RTLD_LAZY);
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		}
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		if (!handle) {
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			sprintf(path, "%s/libipt_%s.so", lib_dir, lname);
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			handle = dlopen(path, RTLD_LAZY);
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		}
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		/* ok, lets give up .. */
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		if (!handle) {
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			fputs(dlerror(), stderr);
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			printf("\n");
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			free(new_name);
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			free(lname);
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			return NULL;
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		}
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	}
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	m = dlsym(handle, new_name);
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	if ((error = dlerror()) != NULL) {
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		m = (struct xtables_target *) dlsym(handle, lname);
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		if ((error = dlerror()) != NULL) {
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			m = find_t(new_name);
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			if (m == NULL) {
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				m = find_t(lname);
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				if (m == NULL) {
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					fputs(error, stderr);
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					fprintf(stderr, "\n");
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					dlclose(handle);
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					free(new_name);
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					free(lname);
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					return NULL;
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				}
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			}
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		}
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	}
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	free(new_name);
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	free(lname);
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	return m;
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}
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static void set_revision(char *name, u_int8_t revision)
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{
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	/* Old kernel sources don't have ".revision" field,
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	*  but we stole a byte from name. */
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	name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0';
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	name[IPT_FUNCTION_MAXNAMELEN - 1] = revision;
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}
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/*
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 * we may need to check for version mismatch
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*/
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static int build_st(struct xtables_target *target, struct ipt_entry_target *t)
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{
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	if (target) {
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		size_t size;
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		size =
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		    XT_ALIGN(sizeof(struct ipt_entry_target)) + target->size;
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		if (t == NULL) {
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			target->t = fw_calloc(1, size);
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			target->t->u.target_size = size;
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			if (target->init != NULL)
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				target->init(target->t);
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			set_revision(target->t->u.user.name, target->revision);
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		} else {
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			target->t = t;
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		}
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		strcpy(target->t->u.user.name, target->name);
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		return 0;
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	}
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	return -1;
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}
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static int parse_ipt(struct action_util *a, int *argc_p,
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		     char ***argv_p, int tca_id, struct nlmsghdr *n)
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{
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	struct xtables_target *m = NULL;
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	struct ipt_entry fw;
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	struct rtattr *tail;
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	int c;
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	int rargc = *argc_p;
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	char **argv = *argv_p;
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	int argc = 0, iargc = 0;
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	char k[FILTER_NAMESZ];
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	int size = 0;
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	int iok = 0, ok = 0;
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	__u32 hook = 0, index = 0;
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	lib_dir = getenv("IPTABLES_LIB_DIR");
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	if (!lib_dir)
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		lib_dir = IPT_LIB_DIR;
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	{
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		int i;
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		for (i = 0; i < rargc; i++) {
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			if (!argv[i] || strcmp(argv[i], "action") == 0)
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				break;
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		}
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		iargc = argc = i;
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	}
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	if (argc <= 2) {
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		fprintf(stderr, "bad arguments to ipt %d vs %d\n", argc, rargc);
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		return -1;
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	}
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	while (1) {
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		c = getopt_long(argc, argv, "j:", opts, NULL);
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		if (c == -1)
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			break;
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		switch (c) {
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		case 'j':
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			m = get_target_name(optarg);
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			if (m != NULL) {
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				if (build_st(m, NULL) < 0) {
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					printf(" %s error\n", m->name);
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					return -1;
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				}
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				opts =
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				    merge_options(opts, m->extra_opts,
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						  &m->option_offset);
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			} else {
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				fprintf(stderr, " failed to find target %s\n\n", optarg);
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				return -1;
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			}
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			ok++;
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			break;
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		default:
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			memset(&fw, 0, sizeof(fw));
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			if (m) {
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				m->parse(c - m->option_offset, argv, 0,
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					 &m->tflags, NULL, &m->t);
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			} else {
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				fprintf(stderr, " failed to find target %s\n\n", optarg);
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				return -1;
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			}
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			ok++;
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			break;
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		}
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	}
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	if (iargc > optind) {
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		if (matches(argv[optind], "index") == 0) {
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			if (get_u32(&index, argv[optind + 1], 10)) {
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				fprintf(stderr, "Illegal \"index\"\n");
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				free_opts(opts);
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				return -1;
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			}
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			iok++;
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			optind += 2;
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		}
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	}
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	if (!ok && !iok) {
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		fprintf(stderr, " ipt Parser BAD!! (%s)\n", *argv);
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		return -1;
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	}
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	/* check that we passed the correct parameters to the target */
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	if (m)
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		m->final_check(m->tflags);
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	{
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		struct tcmsg *t = NLMSG_DATA(n);
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		if (t->tcm_parent != TC_H_ROOT
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		    && t->tcm_parent == TC_H_MAJ(TC_H_INGRESS)) {
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			hook = NF_IP_PRE_ROUTING;
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		} else {
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			hook = NF_IP_POST_ROUTING;
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		}
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	}
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	tail = addattr_nest(n, MAX_MSG, tca_id);
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	fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
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	fprintf(stdout, "\ttarget: ");
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	if (m)
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		m->print(NULL, m->t, 0);
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	fprintf(stdout, " index %d\n", index);
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	if (strlen(tname) > 16) {
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		size = 16;
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		k[15] = 0;
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	} else {
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		size = 1 + strlen(tname);
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	}
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	strncpy(k, tname, size);
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	addattr_l(n, MAX_MSG, TCA_IPT_TABLE, k, size);
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	addattr_l(n, MAX_MSG, TCA_IPT_HOOK, &hook, 4);
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	addattr_l(n, MAX_MSG, TCA_IPT_INDEX, &index, 4);
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	if (m)
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		addattr_l(n, MAX_MSG, TCA_IPT_TARG, m->t, m->t->u.target_size);
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	addattr_nest_end(n, tail);
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	argc -= optind;
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	argv += optind;
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	*argc_p = rargc - iargc;
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	*argv_p = argv;
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	optind = 0;
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	free_opts(opts);
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	/* Clear flags if target will be used again */
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        m->tflags = 0;
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        m->used = 0;
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	/* Free allocated memory */
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	if (m->t)
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	    free(m->t);
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	return 0;
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}
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static int
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print_ipt(struct action_util *au, FILE * f, struct rtattr *arg)
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{
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	struct rtattr *tb[TCA_IPT_MAX + 1];
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	struct ipt_entry_target *t = NULL;
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	struct xtables_target *m;
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	__u32 hook;
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	if (arg == NULL)
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		return -1;
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	lib_dir = getenv("IPTABLES_LIB_DIR");
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	if (!lib_dir)
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		lib_dir = IPT_LIB_DIR;
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	parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
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	if (tb[TCA_IPT_TABLE] == NULL) {
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		fprintf(stderr,  "Missing ipt table name, assuming mangle\n");
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	} else {
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		fprintf(f, "tablename: %s ",
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			rta_getattr_str(tb[TCA_IPT_TABLE]));
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	}
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	if (tb[TCA_IPT_HOOK] == NULL) {
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		fprintf(stderr, "Missing ipt hook name\n ");
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		return -1;
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	}
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	hook = rta_getattr_u32(tb[TCA_IPT_HOOK]);
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	fprintf(f, " hook: %s\n", ipthooks[hook]);
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	if (tb[TCA_IPT_TARG] == NULL) {
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		fprintf(stderr, "Missing ipt target parameters\n");
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		return -1;
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	}
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	t = RTA_DATA(tb[TCA_IPT_TARG]);
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	m = get_target_name(t->u.user.name);
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	if (m != NULL) {
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		if (build_st(m, t) < 0) {
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			fprintf(stderr, " %s error\n", m->name);
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			return -1;
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		}
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		opts =
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			merge_options(opts, m->extra_opts,
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				      &m->option_offset);
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	} else {
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		fprintf(stderr, " failed to find target %s\n\n",
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			t->u.user.name);
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		return -1;
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	}
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	fprintf(f, "\ttarget ");
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	m->print(NULL, m->t, 0);
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	if (tb[TCA_IPT_INDEX] == NULL) {
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		fprintf(stderr, "Missing ipt target index\n");
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	} else {
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		__u32 index;
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		index = rta_getattr_u32(tb[TCA_IPT_INDEX]);
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		fprintf(f, "\n\tindex %u", index);
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	}
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	if (tb[TCA_IPT_CNT]) {
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		struct tc_cnt *c  = RTA_DATA(tb[TCA_IPT_CNT]);
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		fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt);
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	}
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	if (show_stats) {
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		if (tb[TCA_IPT_TM]) {
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			struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]);
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			print_tm(f, tm);
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		}
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	}
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	fprintf(f, "\n");
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	free_opts(opts);
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	return 0;
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}
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struct action_util ipt_action_util = {
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	.id = "ipt",
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	.parse_aopt = parse_ipt,
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	.print_aopt = print_ipt,
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};