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13#include <sys/socket.h>
14#include <netinet/in.h>
15#include <arpa/inet.h>
16#include <net/if.h>
17#include <limits.h>
18#include <linux/netfilter.h>
19#include <linux/netfilter_ipv4/ip_tables.h>
20#include <xtables.h>
21#include "utils.h"
22#include "tc_util.h"
23#include <linux/tc_act/tc_ipt.h>
24#include <stdio.h>
25#include <dlfcn.h>
26#include <getopt.h>
27#include <errno.h>
28#include <string.h>
29#include <netdb.h>
30#include <stdlib.h>
31#include <ctype.h>
32#include <stdarg.h>
33#include <unistd.h>
34#include <fcntl.h>
35#include <sys/wait.h>
36#ifndef XT_LIB_DIR
37# define XT_LIB_DIR "/lib/xtables"
38#endif
39
40#ifndef __ALIGN_KERNEL
41#define __ALIGN_KERNEL(x, a) \
42 __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
43#define __ALIGN_KERNEL_MASK(x, mask) \
44 (((x) + (mask)) & ~(mask))
45#endif
46
47#ifndef ALIGN
48#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
49#endif
50
51static const char *tname = "mangle";
52
53char *lib_dir;
54
55static const char * const ipthooks[] = {
56 "NF_IP_PRE_ROUTING",
57 "NF_IP_LOCAL_IN",
58 "NF_IP_FORWARD",
59 "NF_IP_LOCAL_OUT",
60 "NF_IP_POST_ROUTING",
61};
62
63static struct option original_opts[] = {
64 {
65 .name = "jump",
66 .has_arg = 1,
67 .val = 'j'
68 },
69 {0, 0, 0, 0}
70};
71
72static struct xtables_globals tcipt_globals = {
73 .option_offset = 0,
74 .program_name = "tc-ipt",
75 .program_version = "0.2",
76 .orig_opts = original_opts,
77 .opts = original_opts,
78 .exit_err = NULL,
79#if XTABLES_VERSION_CODE >= 11
80 .compat_rev = xtables_compatible_revision,
81#endif
82};
83
84
85
86
87static int
88build_st(struct xtables_target *target, struct xt_entry_target *t)
89{
90
91 size_t size =
92 XT_ALIGN(sizeof(struct xt_entry_target)) + target->size;
93
94 if (t == NULL) {
95 target->t = xtables_calloc(1, size);
96 target->t->u.target_size = size;
97 strncpy(target->t->u.user.name, target->name,
98 sizeof(target->t->u.user.name) - 1);
99 target->t->u.user.revision = target->revision;
100
101 if (target->init != NULL)
102 target->init(target->t);
103 } else {
104 target->t = t;
105 }
106 return 0;
107
108}
109
110static void set_lib_dir(void)
111{
112
113 lib_dir = getenv("XTABLES_LIBDIR");
114 if (!lib_dir) {
115 lib_dir = getenv("IPTABLES_LIB_DIR");
116 if (lib_dir)
117 fprintf(stderr, "using deprecated IPTABLES_LIB_DIR\n");
118 }
119 if (lib_dir == NULL)
120 lib_dir = XT_LIB_DIR;
121
122}
123
124static int get_xtables_target_opts(struct xtables_globals *globals,
125 struct xtables_target *m)
126{
127 struct option *opts;
128
129#if XTABLES_VERSION_CODE >= 6
130 opts = xtables_options_xfrm(globals->orig_opts,
131 globals->opts,
132 m->x6_options,
133 &m->option_offset);
134#else
135 opts = xtables_merge_options(globals->opts,
136 m->extra_opts,
137 &m->option_offset);
138#endif
139 if (!opts)
140 return -1;
141 globals->opts = opts;
142 return 0;
143}
144
145static int parse_ipt(struct action_util *a, int *argc_p,
146 char ***argv_p, int tca_id, struct nlmsghdr *n)
147{
148 struct xtables_target *m = NULL;
149#if XTABLES_VERSION_CODE >= 6
150 struct ipt_entry fw = {};
151#endif
152 struct rtattr *tail;
153
154 int c;
155 char **argv = *argv_p;
156 int argc;
157 char k[FILTER_NAMESZ];
158 int size = 0;
159 int iok = 0, ok = 0;
160 __u32 hook = 0, index = 0;
161
162
163 struct xtables_globals tmp_tcipt_globals = tcipt_globals;
164
165 xtables_init_all(&tmp_tcipt_globals, NFPROTO_IPV4);
166 set_lib_dir();
167
168
169 for (argc = 0; argc < *argc_p; argc++) {
170 if (!argv[argc] || !strcmp(argv[argc], "action"))
171 break;
172 }
173
174 if (argc <= 2) {
175 fprintf(stderr,
176 "too few arguments for xt, need at least '-j <target>'\n");
177 return -1;
178 }
179
180 while (1) {
181 c = getopt_long(argc, argv, "j:", tmp_tcipt_globals.opts, NULL);
182 if (c == -1)
183 break;
184 switch (c) {
185 case 'j':
186 m = xtables_find_target(optarg, XTF_TRY_LOAD);
187 if (!m) {
188 fprintf(stderr,
189 " failed to find target %s\n\n",
190 optarg);
191 return -1;
192 }
193
194 if (build_st(m, NULL) < 0) {
195 printf(" %s error\n", m->name);
196 return -1;
197 }
198
199 if (get_xtables_target_opts(&tmp_tcipt_globals,
200 m) < 0) {
201 fprintf(stderr,
202 " failed to find additional options for target %s\n\n",
203 optarg);
204 return -1;
205 }
206 ok++;
207 break;
208
209 default:
210#if XTABLES_VERSION_CODE >= 6
211 if (m != NULL && m->x6_parse != NULL) {
212 xtables_option_tpcall(c, argv, 0, m, &fw);
213#else
214 if (m != NULL && m->parse != NULL) {
215 m->parse(c - m->option_offset, argv, 0,
216 &m->tflags, NULL, &m->t);
217#endif
218 } else {
219 fprintf(stderr,
220 "failed to find target %s\n\n", optarg);
221 return -1;
222
223 }
224 ok++;
225 break;
226 }
227 }
228
229 if (argc > optind) {
230 if (matches(argv[optind], "index") == 0) {
231 if (get_u32(&index, argv[optind + 1], 10)) {
232 fprintf(stderr, "Illegal \"index\"\n");
233 xtables_free_opts(1);
234 return -1;
235 }
236 iok++;
237
238 optind += 2;
239 }
240 }
241
242 if (!ok && !iok) {
243 fprintf(stderr, " ipt Parser BAD!! (%s)\n", *argv);
244 return -1;
245 }
246
247
248#if XTABLES_VERSION_CODE >= 6
249 if (m)
250 xtables_option_tfcall(m);
251#else
252 if (m && m->final_check)
253 m->final_check(m->tflags);
254#endif
255
256 {
257 struct tcmsg *t = NLMSG_DATA(n);
258
259 if (t->tcm_parent != TC_H_ROOT
260 && t->tcm_parent == TC_H_MAJ(TC_H_INGRESS)) {
261 hook = NF_IP_PRE_ROUTING;
262 } else {
263 hook = NF_IP_POST_ROUTING;
264 }
265 }
266
267 tail = addattr_nest(n, MAX_MSG, tca_id);
268 fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
269 fprintf(stdout, "\ttarget: ");
270
271 if (m) {
272 if (m->print)
273 m->print(NULL, m->t, 0);
274 else
275 printf("%s ", m->name);
276 }
277 fprintf(stdout, " index %d\n", index);
278
279 if (strlen(tname) >= 16) {
280 size = 15;
281 k[15] = 0;
282 } else {
283 size = 1 + strlen(tname);
284 }
285 strncpy(k, tname, size);
286
287 addattr_l(n, MAX_MSG, TCA_IPT_TABLE, k, size);
288 addattr_l(n, MAX_MSG, TCA_IPT_HOOK, &hook, 4);
289 addattr_l(n, MAX_MSG, TCA_IPT_INDEX, &index, 4);
290 if (m)
291 addattr_l(n, MAX_MSG, TCA_IPT_TARG, m->t, m->t->u.target_size);
292 addattr_nest_end(n, tail);
293
294 argv += optind;
295 *argc_p -= argc;
296 *argv_p = argv;
297
298 optind = 0;
299 xtables_free_opts(1);
300
301 if (m) {
302
303 m->tflags = 0;
304 m->used = 0;
305
306 if (m->t)
307 free(m->t);
308 }
309
310 return 0;
311
312}
313
314static int
315print_ipt(struct action_util *au, FILE *f, struct rtattr *arg)
316{
317 struct xtables_target *m;
318 struct rtattr *tb[TCA_IPT_MAX + 1];
319 struct xt_entry_target *t = NULL;
320 __u32 hook;
321
322 if (arg == NULL)
323 return 0;
324
325
326 struct xtables_globals tmp_tcipt_globals = tcipt_globals;
327
328 xtables_init_all(&tmp_tcipt_globals, NFPROTO_IPV4);
329 set_lib_dir();
330
331 parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
332
333 if (tb[TCA_IPT_TABLE] == NULL) {
334 fprintf(stderr, "Missing ipt table name, assuming mangle\n");
335 } else {
336 fprintf(f, "tablename: %s ",
337 rta_getattr_str(tb[TCA_IPT_TABLE]));
338 }
339
340 if (tb[TCA_IPT_HOOK] == NULL) {
341 fprintf(stderr, "Missing ipt hook name\n ");
342 return -1;
343 }
344
345 if (tb[TCA_IPT_TARG] == NULL) {
346 fprintf(stderr, "Missing ipt target parameters\n");
347 return -1;
348 }
349
350 hook = rta_getattr_u32(tb[TCA_IPT_HOOK]);
351 fprintf(f, " hook: %s\n", ipthooks[hook]);
352
353 t = RTA_DATA(tb[TCA_IPT_TARG]);
354 m = xtables_find_target(t->u.user.name, XTF_TRY_LOAD);
355 if (!m) {
356 fprintf(stderr, " failed to find target %s\n\n",
357 t->u.user.name);
358 return -1;
359 }
360 if (build_st(m, t) < 0) {
361 fprintf(stderr, " %s error\n", m->name);
362 return -1;
363 }
364
365 if (get_xtables_target_opts(&tmp_tcipt_globals, m) < 0) {
366 fprintf(stderr,
367 " failed to find additional options for target %s\n\n",
368 t->u.user.name);
369 return -1;
370 }
371 fprintf(f, "\ttarget ");
372 m->print(NULL, m->t, 0);
373 if (tb[TCA_IPT_INDEX] == NULL) {
374 fprintf(f, " [NULL ipt target index ]\n");
375 } else {
376 __u32 index;
377
378 index = rta_getattr_u32(tb[TCA_IPT_INDEX]);
379 fprintf(f, "\n\tindex %u", index);
380 }
381
382 if (tb[TCA_IPT_CNT]) {
383 struct tc_cnt *c = RTA_DATA(tb[TCA_IPT_CNT]);
384
385 fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt);
386 }
387 if (show_stats) {
388 if (tb[TCA_IPT_TM]) {
389 struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]);
390
391 print_tm(f, tm);
392 }
393 }
394 print_nl();
395
396 xtables_free_opts(1);
397
398 return 0;
399}
400
401struct action_util xt_action_util = {
402 .id = "xt",
403 .parse_aopt = parse_ipt,
404 .print_aopt = print_ipt,
405};
406
