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-rw-r--r--tc/m_xt.c405
1 files changed, 405 insertions, 0 deletions
diff --git a/tc/m_xt.c b/tc/m_xt.c
new file mode 100644
index 0000000..deaf96a
--- /dev/null
+++ b/tc/m_xt.c
@@ -0,0 +1,405 @@
+/*
+ * m_xt.c xtables 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 <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <limits.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <xtables.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>
+#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 *tname = "mangle";
+
+char *lib_dir;
+
+static const char * const 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[] = {
+ {
+ .name = "jump",
+ .has_arg = 1,
+ .val = 'j'
+ },
+ {0, 0, 0, 0}
+};
+
+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
+};
+
+/*
+ * we may need to check for version mismatch
+*/
+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;
+
+ if (t == NULL) {
+ target->t = xtables_calloc(1, size);
+ target->t->u.target_size = size;
+ 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);
+ } else {
+ target->t = t;
+ }
+ return 0;
+
+}
+
+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");
+ }
+ if (lib_dir == NULL)
+ lib_dir = XT_LIB_DIR;
+
+}
+
+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;
+#if XTABLES_VERSION_CODE >= 6
+ struct ipt_entry fw = {};
+#endif
+ struct rtattr *tail;
+
+ int c;
+ char **argv = *argv_p;
+ int argc;
+ char k[FILTER_NAMESZ];
+ int size = 0;
+ int iok = 0, ok = 0;
+ __u32 hook = 0, index = 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 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,
+ "too few arguments for xt, need at least '-j <target>'\n");
+ return -1;
+ }
+
+ while (1) {
+ c = getopt_long(argc, argv, "j:", tmp_tcipt_globals.opts, NULL);
+ if (c == -1)
+ break;
+ switch (c) {
+ case 'j':
+ 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:
+#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);
+ return -1;
+
+ }
+ ok++;
+ break;
+ }
+ }
+
+ if (argc > optind) {
+ if (matches(argv[optind], "index") == 0) {
+ if (get_u32(&index, argv[optind + 1], 10)) {
+ fprintf(stderr, "Illegal \"index\"\n");
+ xtables_free_opts(1);
+ 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 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;
+ } else {
+ hook = NF_IP_POST_ROUTING;
+ }
+ }
+
+ tail = addattr_nest(n, MAX_MSG, tca_id);
+ fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
+ fprintf(stdout, "\ttarget: ");
+
+ 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 = 15;
+ 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);
+ addattr_nest_end(n, tail);
+
+ argv += optind;
+ *argc_p -= argc;
+ *argv_p = argv;
+
+ optind = 0;
+ 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)
+{
+ struct xtables_target *m;
+ struct rtattr *tb[TCA_IPT_MAX + 1];
+ struct xt_entry_target *t = NULL;
+ __u32 hook;
+
+ if (arg == NULL)
+ 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(stderr, "Missing ipt table name, assuming mangle\n");
+ } else {
+ fprintf(f, "tablename: %s ",
+ rta_getattr_str(tb[TCA_IPT_TABLE]));
+ }
+
+ if (tb[TCA_IPT_HOOK] == NULL) {
+ fprintf(stderr, "Missing ipt hook name\n ");
+ return -1;
+ }
+
+ if (tb[TCA_IPT_TARG] == NULL) {
+ 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 {
+ __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);
+ }
+ }
+ print_nl();
+
+ xtables_free_opts(1);
+
+ return 0;
+}
+
+struct action_util xt_action_util = {
+ .id = "xt",
+ .parse_aopt = parse_ipt,
+ .print_aopt = print_ipt,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-30 13:47:25 +0000