You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
520 lines
11 KiB
520 lines
11 KiB
/*
|
|
* m_ipt.c iptables based targets
|
|
* utilities mostly ripped from iptables <duh, its the linux way>
|
|
*
|
|
* This program is free software; you can distribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Authors: J Hadi Salim (hadi@cyberus.ca)
|
|
*/
|
|
|
|
#include <syslog.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <iptables.h>
|
|
#include <linux/netfilter.h>
|
|
#include <linux/netfilter_ipv4/ip_tables.h>
|
|
#include "utils.h"
|
|
#include "tc_util.h"
|
|
#include <linux/tc_act/tc_ipt.h>
|
|
#include <stdio.h>
|
|
#include <dlfcn.h>
|
|
#include <getopt.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <netdb.h>
|
|
#include <stdlib.h>
|
|
#include <ctype.h>
|
|
#include <stdarg.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/wait.h>
|
|
|
|
static const char *pname = "tc-ipt";
|
|
static const char *tname = "mangle";
|
|
static const char *pversion = "0.1";
|
|
|
|
static const char *ipthooks[] = {
|
|
"NF_IP_PRE_ROUTING",
|
|
"NF_IP_LOCAL_IN",
|
|
"NF_IP_FORWARD",
|
|
"NF_IP_LOCAL_OUT",
|
|
"NF_IP_POST_ROUTING",
|
|
};
|
|
|
|
static struct option original_opts[] = {
|
|
{"jump", 1, 0, 'j'},
|
|
{0, 0, 0, 0}
|
|
};
|
|
|
|
static struct xtables_target *t_list;
|
|
static struct option *opts = original_opts;
|
|
static unsigned int global_option_offset;
|
|
#define OPTION_OFFSET 256
|
|
|
|
char *lib_dir;
|
|
|
|
void
|
|
xtables_register_target(struct xtables_target *me)
|
|
{
|
|
me->next = t_list;
|
|
t_list = me;
|
|
|
|
}
|
|
|
|
static void exit_tryhelp(int status)
|
|
{
|
|
fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
|
|
pname, pname);
|
|
exit(status);
|
|
}
|
|
|
|
static void exit_error(enum xtables_exittype status, char *msg, ...)
|
|
{
|
|
va_list args;
|
|
|
|
va_start(args, msg);
|
|
fprintf(stderr, "%s v%s: ", pname, pversion);
|
|
vfprintf(stderr, msg, args);
|
|
va_end(args);
|
|
fprintf(stderr, "\n");
|
|
if (status == PARAMETER_PROBLEM)
|
|
exit_tryhelp(status);
|
|
if (status == VERSION_PROBLEM)
|
|
fprintf(stderr,
|
|
"Perhaps iptables or your kernel needs to be upgraded.\n");
|
|
exit(status);
|
|
}
|
|
|
|
/* stolen from iptables 1.2.11
|
|
They should really have them as a library so i can link to them
|
|
Email them next time i remember
|
|
*/
|
|
|
|
static void free_opts(struct option *local_opts)
|
|
{
|
|
if (local_opts != original_opts) {
|
|
free(local_opts);
|
|
opts = original_opts;
|
|
global_option_offset = 0;
|
|
}
|
|
}
|
|
|
|
static struct option *
|
|
merge_options(struct option *oldopts, const struct option *newopts,
|
|
unsigned int *option_offset)
|
|
{
|
|
struct option *merge;
|
|
unsigned int num_old, num_new, i;
|
|
|
|
for (num_old = 0; oldopts[num_old].name; num_old++);
|
|
for (num_new = 0; newopts[num_new].name; num_new++);
|
|
|
|
*option_offset = global_option_offset + OPTION_OFFSET;
|
|
|
|
merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
|
|
memcpy(merge, oldopts, num_old * sizeof(struct option));
|
|
for (i = 0; i < num_new; i++) {
|
|
merge[num_old + i] = newopts[i];
|
|
merge[num_old + i].val += *option_offset;
|
|
}
|
|
memset(merge + num_old + num_new, 0, sizeof(struct option));
|
|
|
|
return merge;
|
|
}
|
|
|
|
static void *
|
|
fw_calloc(size_t count, size_t size)
|
|
{
|
|
void *p;
|
|
|
|
if ((p = (void *) calloc(count, size)) == NULL) {
|
|
perror("iptables: calloc failed");
|
|
exit(1);
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static struct xtables_target *
|
|
find_t(char *name)
|
|
{
|
|
struct xtables_target *m;
|
|
|
|
for (m = t_list; m; m = m->next) {
|
|
if (strcmp(m->name, name) == 0)
|
|
return m;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct xtables_target *
|
|
get_target_name(const char *name)
|
|
{
|
|
void *handle;
|
|
char *error;
|
|
char *new_name, *lname;
|
|
struct xtables_target *m;
|
|
char path[strlen(lib_dir) + sizeof("/libipt_.so") + strlen(name)];
|
|
|
|
#ifdef NO_SHARED_LIBS
|
|
return NULL;
|
|
#endif
|
|
|
|
new_name = calloc(1, strlen(name) + 1);
|
|
lname = calloc(1, strlen(name) + 1);
|
|
if (!new_name)
|
|
exit_error(PARAMETER_PROBLEM, "get_target_name");
|
|
if (!lname)
|
|
exit_error(PARAMETER_PROBLEM, "get_target_name");
|
|
|
|
strcpy(new_name, name);
|
|
strcpy(lname, name);
|
|
|
|
if (isupper(lname[0])) {
|
|
int i;
|
|
|
|
for (i = 0; i < strlen(name); i++) {
|
|
lname[i] = tolower(lname[i]);
|
|
}
|
|
}
|
|
|
|
if (islower(new_name[0])) {
|
|
int i;
|
|
|
|
for (i = 0; i < strlen(new_name); i++) {
|
|
new_name[i] = toupper(new_name[i]);
|
|
}
|
|
}
|
|
|
|
/* try libxt_xx first */
|
|
sprintf(path, "%s/libxt_%s.so", lib_dir, new_name);
|
|
handle = dlopen(path, RTLD_LAZY);
|
|
if (!handle) {
|
|
/* try libipt_xx next */
|
|
sprintf(path, "%s/libipt_%s.so", lib_dir, new_name);
|
|
handle = dlopen(path, RTLD_LAZY);
|
|
|
|
if (!handle) {
|
|
sprintf(path, "%s/libxt_%s.so", lib_dir, lname);
|
|
handle = dlopen(path, RTLD_LAZY);
|
|
}
|
|
|
|
if (!handle) {
|
|
sprintf(path, "%s/libipt_%s.so", lib_dir, lname);
|
|
handle = dlopen(path, RTLD_LAZY);
|
|
}
|
|
/* ok, lets give up .. */
|
|
if (!handle) {
|
|
fputs(dlerror(), stderr);
|
|
printf("\n");
|
|
free(new_name);
|
|
free(lname);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
m = dlsym(handle, new_name);
|
|
if ((error = dlerror()) != NULL) {
|
|
m = (struct xtables_target *) dlsym(handle, lname);
|
|
if ((error = dlerror()) != NULL) {
|
|
m = find_t(new_name);
|
|
if (m == NULL) {
|
|
m = find_t(lname);
|
|
if (m == NULL) {
|
|
fputs(error, stderr);
|
|
fprintf(stderr, "\n");
|
|
dlclose(handle);
|
|
free(new_name);
|
|
free(lname);
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
free(new_name);
|
|
free(lname);
|
|
return m;
|
|
}
|
|
|
|
static void set_revision(char *name, u_int8_t revision)
|
|
{
|
|
/* Old kernel sources don't have ".revision" field,
|
|
* but we stole a byte from name. */
|
|
name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0';
|
|
name[IPT_FUNCTION_MAXNAMELEN - 1] = revision;
|
|
}
|
|
|
|
/*
|
|
* we may need to check for version mismatch
|
|
*/
|
|
static int build_st(struct xtables_target *target, struct ipt_entry_target *t)
|
|
{
|
|
if (target) {
|
|
size_t size;
|
|
|
|
size =
|
|
XT_ALIGN(sizeof(struct ipt_entry_target)) + target->size;
|
|
|
|
if (t == NULL) {
|
|
target->t = fw_calloc(1, size);
|
|
target->t->u.target_size = size;
|
|
|
|
if (target->init != NULL)
|
|
target->init(target->t);
|
|
set_revision(target->t->u.user.name, target->revision);
|
|
} else {
|
|
target->t = t;
|
|
}
|
|
strcpy(target->t->u.user.name, target->name);
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int parse_ipt(struct action_util *a, int *argc_p,
|
|
char ***argv_p, int tca_id, struct nlmsghdr *n)
|
|
{
|
|
struct xtables_target *m = NULL;
|
|
struct ipt_entry fw;
|
|
struct rtattr *tail;
|
|
int c;
|
|
int rargc = *argc_p;
|
|
char **argv = *argv_p;
|
|
int argc = 0, iargc = 0;
|
|
char k[16];
|
|
int size = 0;
|
|
int iok = 0, ok = 0;
|
|
__u32 hook = 0, index = 0;
|
|
|
|
lib_dir = getenv("IPTABLES_LIB_DIR");
|
|
if (!lib_dir)
|
|
lib_dir = IPT_LIB_DIR;
|
|
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < rargc; i++) {
|
|
if (NULL == argv[i] || 0 == strcmp(argv[i], "action")) {
|
|
break;
|
|
}
|
|
}
|
|
iargc = argc = i;
|
|
}
|
|
|
|
if (argc <= 2) {
|
|
fprintf(stderr, "bad arguments to ipt %d vs %d\n", argc, rargc);
|
|
return -1;
|
|
}
|
|
|
|
while (1) {
|
|
c = getopt_long(argc, argv, "j:", opts, NULL);
|
|
if (c == -1)
|
|
break;
|
|
switch (c) {
|
|
case 'j':
|
|
m = get_target_name(optarg);
|
|
if (m != NULL) {
|
|
|
|
if (build_st(m, NULL) < 0) {
|
|
printf(" %s error\n", m->name);
|
|
return -1;
|
|
}
|
|
opts =
|
|
merge_options(opts, m->extra_opts,
|
|
&m->option_offset);
|
|
} else {
|
|
fprintf(stderr, " failed to find target %s\n\n", optarg);
|
|
return -1;
|
|
}
|
|
ok++;
|
|
break;
|
|
|
|
default:
|
|
memset(&fw, 0, sizeof(fw));
|
|
if (m) {
|
|
m->parse(c - m->option_offset, argv, 0,
|
|
&m->tflags, NULL, &m->t);
|
|
} else {
|
|
fprintf(stderr, " failed to find target %s\n\n", optarg);
|
|
return -1;
|
|
|
|
}
|
|
ok++;
|
|
break;
|
|
|
|
}
|
|
}
|
|
|
|
if (iargc > optind) {
|
|
if (matches(argv[optind], "index") == 0) {
|
|
if (get_u32(&index, argv[optind + 1], 10)) {
|
|
fprintf(stderr, "Illegal \"index\"\n");
|
|
free_opts(opts);
|
|
return -1;
|
|
}
|
|
iok++;
|
|
|
|
optind += 2;
|
|
}
|
|
}
|
|
|
|
if (!ok && !iok) {
|
|
fprintf(stderr, " ipt Parser BAD!! (%s)\n", *argv);
|
|
return -1;
|
|
}
|
|
|
|
/* check that we passed the correct parameters to the target */
|
|
if (m)
|
|
m->final_check(m->tflags);
|
|
|
|
{
|
|
struct tcmsg *t = NLMSG_DATA(n);
|
|
|
|
if (t->tcm_parent != TC_H_ROOT
|
|
&& t->tcm_parent == TC_H_MAJ(TC_H_INGRESS)) {
|
|
hook = NF_IP_PRE_ROUTING;
|
|
} else {
|
|
hook = NF_IP_POST_ROUTING;
|
|
}
|
|
}
|
|
|
|
tail = NLMSG_TAIL(n);
|
|
addattr_l(n, MAX_MSG, tca_id, NULL, 0);
|
|
fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
|
|
fprintf(stdout, "\ttarget: ");
|
|
|
|
if (m)
|
|
m->print(NULL, m->t, 0);
|
|
fprintf(stdout, " index %d\n", index);
|
|
|
|
if (strlen(tname) > 16) {
|
|
size = 16;
|
|
k[15] = 0;
|
|
} else {
|
|
size = 1 + strlen(tname);
|
|
}
|
|
strncpy(k, tname, size);
|
|
|
|
addattr_l(n, MAX_MSG, TCA_IPT_TABLE, k, size);
|
|
addattr_l(n, MAX_MSG, TCA_IPT_HOOK, &hook, 4);
|
|
addattr_l(n, MAX_MSG, TCA_IPT_INDEX, &index, 4);
|
|
if (m)
|
|
addattr_l(n, MAX_MSG, TCA_IPT_TARG, m->t, m->t->u.target_size);
|
|
tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
|
|
|
|
argc -= optind;
|
|
argv += optind;
|
|
*argc_p = rargc - iargc;
|
|
*argv_p = argv;
|
|
|
|
optind = 0;
|
|
free_opts(opts);
|
|
/* Clear flags if target will be used again */
|
|
m->tflags = 0;
|
|
m->used = 0;
|
|
/* Free allocated memory */
|
|
if (m->t)
|
|
free(m->t);
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int
|
|
print_ipt(struct action_util *au, FILE * f, struct rtattr *arg)
|
|
{
|
|
struct rtattr *tb[TCA_IPT_MAX + 1];
|
|
struct ipt_entry_target *t = NULL;
|
|
|
|
if (arg == NULL)
|
|
return -1;
|
|
|
|
lib_dir = getenv("IPTABLES_LIB_DIR");
|
|
if (!lib_dir)
|
|
lib_dir = IPT_LIB_DIR;
|
|
|
|
parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
|
|
|
|
if (tb[TCA_IPT_TABLE] == NULL) {
|
|
fprintf(f, "[NULL ipt table name ] assuming mangle ");
|
|
} else {
|
|
fprintf(f, "tablename: %s ",
|
|
rta_getattr_str(tb[TCA_IPT_TABLE]));
|
|
}
|
|
|
|
if (tb[TCA_IPT_HOOK] == NULL) {
|
|
fprintf(f, "[NULL ipt hook name ]\n ");
|
|
return -1;
|
|
} else {
|
|
__u32 hook;
|
|
|
|
hook = rta_getattr_u32(tb[TCA_IPT_HOOK]);
|
|
fprintf(f, " hook: %s\n", ipthooks[hook]);
|
|
}
|
|
|
|
if (tb[TCA_IPT_TARG] == NULL) {
|
|
fprintf(f, "\t[NULL ipt target parameters ]\n");
|
|
return -1;
|
|
} else {
|
|
struct xtables_target *m = NULL;
|
|
|
|
t = RTA_DATA(tb[TCA_IPT_TARG]);
|
|
m = get_target_name(t->u.user.name);
|
|
if (m != NULL) {
|
|
if (build_st(m, t) < 0) {
|
|
fprintf(stderr, " %s error\n", m->name);
|
|
return -1;
|
|
}
|
|
|
|
opts =
|
|
merge_options(opts, m->extra_opts,
|
|
&m->option_offset);
|
|
} else {
|
|
fprintf(stderr, " failed to find target %s\n\n",
|
|
t->u.user.name);
|
|
return -1;
|
|
}
|
|
fprintf(f, "\ttarget ");
|
|
m->print(NULL, m->t, 0);
|
|
if (tb[TCA_IPT_INDEX] == NULL) {
|
|
fprintf(f, " [NULL ipt target index ]\n");
|
|
} else {
|
|
__u32 index;
|
|
|
|
index = rta_getattr_u32(tb[TCA_IPT_INDEX]);
|
|
fprintf(f, "\n\tindex %u", index);
|
|
}
|
|
|
|
if (tb[TCA_IPT_CNT]) {
|
|
struct tc_cnt *c = RTA_DATA(tb[TCA_IPT_CNT]);
|
|
|
|
fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt);
|
|
}
|
|
if (show_stats) {
|
|
if (tb[TCA_IPT_TM]) {
|
|
struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]);
|
|
|
|
print_tm(f, tm);
|
|
}
|
|
}
|
|
fprintf(f, "\n");
|
|
|
|
}
|
|
free_opts(opts);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct action_util ipt_action_util = {
|
|
.id = "ipt",
|
|
.parse_aopt = parse_ipt,
|
|
.print_aopt = print_ipt,
|
|
};
|