/*
* m_xt.c xtables based targets
- * utilities mostly ripped from iptables <duh, its the linux way>
+ * 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
* Authors: J Hadi Salim (hadi@cyberus.ca)
*/
-/*XXX: in the future (xtables 1.4.3?) get rid of everything tagged
- * as TC_CONFIG_XT_H */
-
-#include <syslog.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdarg.h>
-#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/wait.h>
-#ifdef TC_CONFIG_XT_H
-#include "xt-internal.h"
+#ifndef XT_LIB_DIR
+# define XT_LIB_DIR "/lib/xtables"
+#endif
+
+#ifndef __ALIGN_KERNEL
+#define __ALIGN_KERNEL(x, a) \
+ __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
+#define __ALIGN_KERNEL_MASK(x, mask) \
+ (((x) + (mask)) & ~(mask))
+#endif
+
+#ifndef ALIGN
+#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
#endif
-static const char *pname = "tc-ipt";
static const char *tname = "mangle";
-static const char *pversion = "0.2";
-static const char *ipthooks[] = {
+char *lib_dir;
+
+static const char * const ipthooks[] = {
"NF_IP_PRE_ROUTING",
"NF_IP_LOCAL_IN",
"NF_IP_FORWARD",
};
static struct option original_opts[] = {
- {"jump", 1, 0, 'j'},
+ {
+ .name = "jump",
+ .has_arg = 1,
+ .val = 'j'
+ },
{0, 0, 0, 0}
};
-static struct option *opts = original_opts;
-static unsigned int global_option_offset = 0;
-char *lib_dir;
-const char *program_version = XTABLES_VERSION;
-const char *program_name = "tc-ipt";
-struct afinfo afinfo = {
- .family = AF_INET,
- .libprefix = "libxt_",
- .ipproto = IPPROTO_IP,
- .kmod = "ip_tables",
- .so_rev_target = IPT_SO_GET_REVISION_TARGET,
-};
-
-
-#define OPTION_OFFSET 256
-
-/*XXX: TC_CONFIG_XT_H */
-static void free_opts(struct option *local_opts)
-{
- if (local_opts != original_opts) {
- free(local_opts);
- opts = original_opts;
- global_option_offset = 0;
- }
-}
-
-/*XXX: TC_CONFIG_XT_H */
-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;
-}
-
-
-/*XXX: TC_CONFIG_XT_H */
-#ifndef TRUE
-#define TRUE 1
+static struct xtables_globals tcipt_globals = {
+ .option_offset = 0,
+ .program_name = "tc-ipt",
+ .program_version = "0.2",
+ .orig_opts = original_opts,
+ .opts = original_opts,
+ .exit_err = NULL,
+#if XTABLES_VERSION_CODE >= 11
+ .compat_rev = xtables_compatible_revision,
#endif
-#ifndef FALSE
-#define FALSE 0
-#endif
-
-/*XXX: TC_CONFIG_XT_H */
-int
-check_inverse(const char option[], int *invert, int *my_optind, int argc)
-{
- if (option && strcmp(option, "!") == 0) {
- if (*invert)
- exit_error(PARAMETER_PROBLEM,
- "Multiple `!' flags not allowed");
- *invert = TRUE;
- if (my_optind != NULL) {
- ++*my_optind;
- if (argc && *my_optind > argc)
- exit_error(PARAMETER_PROBLEM,
- "no argument following `!'");
- }
-
- return TRUE;
- }
- return FALSE;
-}
-
-/*XXX: TC_CONFIG_XT_H */
-void exit_error(enum exittype status, const 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");
- /* On error paths, make sure that we don't leak memory */
- exit(status);
-}
-
-/*XXX: TC_CONFIG_XT_H */
-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
*/
-int
+static int
build_st(struct xtables_target *target, struct xt_entry_target *t)
{
size_t size =
- XT_ALIGN(sizeof (struct xt_entry_target)) + target->size;
+ XT_ALIGN(sizeof(struct xt_entry_target)) + target->size;
- if (NULL == t) {
- target->t = fw_calloc(1, size);
+ if (t == NULL) {
+ target->t = xtables_calloc(1, size);
target->t->u.target_size = size;
- strcpy(target->t->u.user.name, target->name);
- set_revision(target->t->u.user.name, target->revision);
+ strncpy(target->t->u.user.name, target->name,
+ sizeof(target->t->u.user.name) - 1);
+ target->t->u.user.revision = target->revision;
if (target->init != NULL)
target->init(target->t);
}
-inline void set_lib_dir(void)
+static void set_lib_dir(void)
{
lib_dir = getenv("XTABLES_LIBDIR");
if (!lib_dir) {
lib_dir = getenv("IPTABLES_LIB_DIR");
if (lib_dir)
- fprintf(stderr, "using deprecated IPTABLES_LIB_DIR \n");
+ fprintf(stderr, "using deprecated IPTABLES_LIB_DIR\n");
}
if (lib_dir == NULL)
lib_dir = XT_LIB_DIR;
}
-static int parse_ipt(struct action_util *a,int *argc_p,
+static int get_xtables_target_opts(struct xtables_globals *globals,
+ struct xtables_target *m)
+{
+ struct option *opts;
+
+#if XTABLES_VERSION_CODE >= 6
+ opts = xtables_options_xfrm(globals->orig_opts,
+ globals->opts,
+ m->x6_options,
+ &m->option_offset);
+#else
+ opts = xtables_merge_options(globals->opts,
+ m->extra_opts,
+ &m->option_offset);
+#endif
+ if (!opts)
+ return -1;
+ globals->opts = opts;
+ return 0;
+}
+
+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;
+#if XTABLES_VERSION_CODE >= 6
+ struct ipt_entry fw = {};
+#endif
struct rtattr *tail;
+
int c;
- int rargc = *argc_p;
char **argv = *argv_p;
- int argc = 0, iargc = 0;
- char k[16];
- int res = -1;
+ int argc;
+ char k[FILTER_NAMESZ];
int size = 0;
int iok = 0, ok = 0;
__u32 hook = 0, index = 0;
- res = 0;
+ /* copy tcipt_globals because .opts will be modified by iptables */
+ struct xtables_globals tmp_tcipt_globals = tcipt_globals;
+
+ xtables_init_all(&tmp_tcipt_globals, NFPROTO_IPV4);
set_lib_dir();
- {
- int i;
- for (i = 0; i < rargc; i++) {
- if (NULL == argv[i] || 0 == strcmp(argv[i], "action")) {
- break;
- }
- }
- iargc = argc = i;
+ /* parse only up until the next action */
+ for (argc = 0; argc < *argc_p; argc++) {
+ if (!argv[argc] || !strcmp(argv[argc], "action"))
+ break;
}
if (argc <= 2) {
- fprintf(stderr,"bad arguements to ipt %d vs %d \n", argc, rargc);
+ fprintf(stderr,
+ "too few arguments for xt, need at least '-j <target>'\n");
return -1;
}
while (1) {
- c = getopt_long(argc, argv, "j:", opts, NULL);
+ c = getopt_long(argc, argv, "j:", tmp_tcipt_globals.opts, NULL);
if (c == -1)
break;
switch (c) {
case 'j':
- m = find_target(optarg, TRY_LOAD);
- if (NULL != m) {
-
- if (0 > build_st(m, NULL)) {
- 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);
+ m = xtables_find_target(optarg, XTF_TRY_LOAD);
+ if (!m) {
+ fprintf(stderr,
+ " failed to find target %s\n\n",
+ optarg);
+ return -1;
+ }
+
+ if (build_st(m, NULL) < 0) {
+ printf(" %s error\n", m->name);
+ return -1;
+ }
+
+ if (get_xtables_target_opts(&tmp_tcipt_globals,
+ m) < 0) {
+ fprintf(stderr,
+ " failed to find additional options for target %s\n\n",
+ optarg);
return -1;
}
ok++;
break;
default:
- memset(&fw, 0, sizeof (fw));
- if (m) {
+#if XTABLES_VERSION_CODE >= 6
+ if (m != NULL && m->x6_parse != NULL) {
+ xtables_option_tpcall(c, argv, 0, m, &fw);
+#else
+ if (m != NULL && m->parse != NULL) {
m->parse(c - m->option_offset, argv, 0,
&m->tflags, NULL, &m->t);
+#endif
} else {
- fprintf(stderr," failed to find target %s\n\n", optarg);
+ fprintf(stderr,
+ "failed to find target %s\n\n", optarg);
return -1;
}
ok++;
break;
-
}
}
- if (iargc > optind) {
+ if (argc > optind) {
if (matches(argv[optind], "index") == 0) {
if (get_u32(&index, argv[optind + 1], 10)) {
fprintf(stderr, "Illegal \"index\"\n");
- free_opts(opts);
+ xtables_free_opts(1);
return -1;
}
iok++;
}
if (!ok && !iok) {
- fprintf(stderr," ipt Parser BAD!! (%s)\n", *argv);
+ fprintf(stderr, " ipt Parser BAD!! (%s)\n", *argv);
return -1;
}
/* check that we passed the correct parameters to the target */
+#if XTABLES_VERSION_CODE >= 6
if (m)
+ xtables_option_tfcall(m);
+#else
+ if (m && m->final_check)
m->final_check(m->tflags);
+#endif
{
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;
}
}
- tail = NLMSG_TAIL(n);
- addattr_l(n, MAX_MSG, tca_id, NULL, 0);
+ tail = addattr_nest(n, MAX_MSG, tca_id);
fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
fprintf(stdout, "\ttarget: ");
- if (m)
- m->print(NULL, m->t, 0);
+ if (m) {
+ if (m->print)
+ m->print(NULL, m->t, 0);
+ else
+ printf("%s ", m->name);
+ }
fprintf(stdout, " index %d\n", index);
- if (strlen(tname) > 16) {
- size = 16;
+ if (strlen(tname) >= 16) {
+ size = 15;
k[15] = 0;
} else {
size = 1 + strlen(tname);
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;
+ addattr_nest_end(n, tail);
- argc -= optind;
argv += optind;
- *argc_p = rargc - iargc;
+ *argc_p -= argc;
*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);
-
+ xtables_free_opts(1);
+
+ if (m) {
+ /* 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)
+print_ipt(struct action_util *au, FILE *f, struct rtattr *arg)
{
+ struct xtables_target *m;
struct rtattr *tb[TCA_IPT_MAX + 1];
struct xt_entry_target *t = NULL;
+ __u32 hook;
if (arg == NULL)
- return -1;
+ return 0;
+
+ /* copy tcipt_globals because .opts will be modified by iptables */
+ struct xtables_globals tmp_tcipt_globals = tcipt_globals;
+ xtables_init_all(&tmp_tcipt_globals, NFPROTO_IPV4);
set_lib_dir();
parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
if (tb[TCA_IPT_TABLE] == NULL) {
- fprintf(f, "[NULL ipt table name ] assuming mangle ");
+ fprintf(stderr, "Missing ipt table name, assuming mangle\n");
} else {
fprintf(f, "tablename: %s ",
- (char *) RTA_DATA(tb[TCA_IPT_TABLE]));
+ rta_getattr_str(tb[TCA_IPT_TABLE]));
}
if (tb[TCA_IPT_HOOK] == NULL) {
- fprintf(f, "[NULL ipt hook name ]\n ");
+ fprintf(stderr, "Missing ipt hook name\n ");
return -1;
- } else {
- __u32 hook;
- hook = *(__u32 *) RTA_DATA(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");
+ fprintf(stderr, "Missing ipt target parameters\n");
return -1;
+ }
+
+ hook = rta_getattr_u32(tb[TCA_IPT_HOOK]);
+ fprintf(f, " hook: %s\n", ipthooks[hook]);
+
+ t = RTA_DATA(tb[TCA_IPT_TARG]);
+ m = xtables_find_target(t->u.user.name, XTF_TRY_LOAD);
+ if (!m) {
+ fprintf(stderr, " failed to find target %s\n\n",
+ t->u.user.name);
+ return -1;
+ }
+ if (build_st(m, t) < 0) {
+ fprintf(stderr, " %s error\n", m->name);
+ return -1;
+ }
+
+ if (get_xtables_target_opts(&tmp_tcipt_globals, m) < 0) {
+ fprintf(stderr,
+ " failed to find additional options for 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 {
- struct xtables_target *m = NULL;
- t = RTA_DATA(tb[TCA_IPT_TARG]);
- m = find_target(t->u.user.name, TRY_LOAD);
- if (NULL != m) {
- if (0 > build_st(m, t)) {
- fprintf(stderr, " %s error \n", m->name);
- return -1;
- }
+ __u32 index;
- 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 = *(__u32 *) RTA_DATA(tb[TCA_IPT_INDEX]);
- fprintf(f, " \n\tindex %d", 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");
+ 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);
}
- free_opts(opts);
+ if (show_stats) {
+ if (tb[TCA_IPT_TM]) {
+ struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]);
+
+ print_tm(f, tm);
+ }
+ }
+ print_nl();
+
+ xtables_free_opts(1);
return 0;
}
-struct action_util ipt_action_util = {
- .id = "ipt",
- .parse_aopt = parse_ipt,
- .print_aopt = print_ipt,
+struct action_util xt_action_util = {
+ .id = "xt",
+ .parse_aopt = parse_ipt,
+ .print_aopt = print_ipt,
};
-
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