2 * m_xt.c xtables based targets
3 * utilities mostly ripped from iptables <duh, its the linux way>
5 * This program is free software; you can distribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
10 * Authors: J Hadi Salim (hadi@cyberus.ca)
14 #include <sys/socket.h>
15 #include <netinet/in.h>
16 #include <arpa/inet.h>
19 #include <linux/netfilter.h>
20 #include <linux/netfilter_ipv4/ip_tables.h>
24 #include <linux/tc_act/tc_ipt.h>
38 # define XT_LIB_DIR "/lib/xtables"
42 #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
43 #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
46 static const char *tname = "mangle";
50 static const char *ipthooks[] = {
58 static struct option original_opts[] = {
67 static struct xtables_globals tcipt_globals = {
69 .program_name = "tc-ipt",
70 .program_version = "0.2",
71 .orig_opts = original_opts,
72 .opts = original_opts,
77 * we may need to check for version mismatch
80 build_st(struct xtables_target *target, struct xt_entry_target *t)
84 XT_ALIGN(sizeof (struct xt_entry_target)) + target->size;
87 target->t = xtables_calloc(1, size);
88 target->t->u.target_size = size;
89 strcpy(target->t->u.user.name, target->name);
90 target->t->u.user.revision = target->revision;
92 if (target->init != NULL)
93 target->init(target->t);
101 inline void set_lib_dir(void)
104 lib_dir = getenv("XTABLES_LIBDIR");
106 lib_dir = getenv("IPTABLES_LIB_DIR");
108 fprintf(stderr, "using deprecated IPTABLES_LIB_DIR \n");
111 lib_dir = XT_LIB_DIR;
115 static int parse_ipt(struct action_util *a,int *argc_p,
116 char ***argv_p, int tca_id, struct nlmsghdr *n)
118 struct xtables_target *m = NULL;
123 char **argv = *argv_p;
124 int argc = 0, iargc = 0;
128 __u32 hook = 0, index = 0;
130 xtables_init_all(&tcipt_globals, NFPROTO_IPV4);
135 for (i = 0; i < rargc; i++) {
136 if (NULL == argv[i] || 0 == strcmp(argv[i], "action")) {
144 fprintf(stderr,"bad arguements to ipt %d vs %d \n", argc, rargc);
149 c = getopt_long(argc, argv, "j:", tcipt_globals.opts, NULL);
154 m = xtables_find_target(optarg, XTF_TRY_LOAD);
157 if (0 > build_st(m, NULL)) {
158 printf(" %s error \n", m->name);
162 xtables_merge_options(
163 #if (XTABLES_VERSION_CODE >= 6)
164 tcipt_globals.orig_opts,
170 fprintf(stderr," failed to find target %s\n\n", optarg);
177 memset(&fw, 0, sizeof (fw));
179 m->parse(c - m->option_offset, argv, 0,
180 &m->tflags, NULL, &m->t);
182 fprintf(stderr," failed to find target %s\n\n", optarg);
192 if (iargc > optind) {
193 if (matches(argv[optind], "index") == 0) {
194 if (get_u32(&index, argv[optind + 1], 10)) {
195 fprintf(stderr, "Illegal \"index\"\n");
196 xtables_free_opts(1);
206 fprintf(stderr," ipt Parser BAD!! (%s)\n", *argv);
210 /* check that we passed the correct parameters to the target */
211 if (m && m->final_check)
212 m->final_check(m->tflags);
215 struct tcmsg *t = NLMSG_DATA(n);
216 if (t->tcm_parent != TC_H_ROOT
217 && t->tcm_parent == TC_H_MAJ(TC_H_INGRESS)) {
218 hook = NF_IP_PRE_ROUTING;
220 hook = NF_IP_POST_ROUTING;
224 tail = NLMSG_TAIL(n);
225 addattr_l(n, MAX_MSG, tca_id, NULL, 0);
226 fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
227 fprintf(stdout, "\ttarget: ");
230 m->print(NULL, m->t, 0);
231 fprintf(stdout, " index %d\n", index);
233 if (strlen(tname) > 16) {
237 size = 1 + strlen(tname);
239 strncpy(k, tname, size);
241 addattr_l(n, MAX_MSG, TCA_IPT_TABLE, k, size);
242 addattr_l(n, MAX_MSG, TCA_IPT_HOOK, &hook, 4);
243 addattr_l(n, MAX_MSG, TCA_IPT_INDEX, &index, 4);
245 addattr_l(n, MAX_MSG, TCA_IPT_TARG, m->t, m->t->u.target_size);
246 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
250 *argc_p = rargc - iargc;
254 xtables_free_opts(1);
257 /* Clear flags if target will be used again */
260 /* Free allocated memory */
270 print_ipt(struct action_util *au,FILE * f, struct rtattr *arg)
272 struct rtattr *tb[TCA_IPT_MAX + 1];
273 struct xt_entry_target *t = NULL;
278 xtables_init_all(&tcipt_globals, NFPROTO_IPV4);
281 parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
283 if (tb[TCA_IPT_TABLE] == NULL) {
284 fprintf(f, "[NULL ipt table name ] assuming mangle ");
286 fprintf(f, "tablename: %s ",
287 (char *) RTA_DATA(tb[TCA_IPT_TABLE]));
290 if (tb[TCA_IPT_HOOK] == NULL) {
291 fprintf(f, "[NULL ipt hook name ]\n ");
295 hook = *(__u32 *) RTA_DATA(tb[TCA_IPT_HOOK]);
296 fprintf(f, " hook: %s \n", ipthooks[hook]);
299 if (tb[TCA_IPT_TARG] == NULL) {
300 fprintf(f, "\t[NULL ipt target parameters ] \n");
303 struct xtables_target *m = NULL;
304 t = RTA_DATA(tb[TCA_IPT_TARG]);
305 m = xtables_find_target(t->u.user.name, XTF_TRY_LOAD);
307 if (0 > build_st(m, t)) {
308 fprintf(stderr, " %s error \n", m->name);
313 xtables_merge_options(
314 #if (XTABLES_VERSION_CODE >= 6)
315 tcipt_globals.orig_opts,
321 fprintf(stderr, " failed to find target %s\n\n",
325 fprintf(f, "\ttarget ");
326 m->print(NULL, m->t, 0);
327 if (tb[TCA_IPT_INDEX] == NULL) {
328 fprintf(f, " [NULL ipt target index ]\n");
331 index = *(__u32 *) RTA_DATA(tb[TCA_IPT_INDEX]);
332 fprintf(f, " \n\tindex %d", index);
335 if (tb[TCA_IPT_CNT]) {
336 struct tc_cnt *c = RTA_DATA(tb[TCA_IPT_CNT]);;
337 fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt);
340 if (tb[TCA_IPT_TM]) {
341 struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]);
348 xtables_free_opts(1);
353 struct action_util ipt_action_util = {
355 .parse_aopt = parse_ipt,
356 .print_aopt = print_ipt,