tc/m_xt_old.c

   1 /*
   2  * m_xt.c       xtables based targets
   3  *              utilities mostly ripped from iptables <duh, its the linux way>
   4  *
   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.
   9  *
  10  * Authors:  J Hadi Salim (hadi@cyberus.ca)
  11  */
  12
  13 /*XXX: in the future (xtables 1.4.3?) get rid of everything tagged
  14  * as TC_CONFIG_XT_H */
  15
  16 #include <sys/socket.h>
  17 #include <netinet/in.h>
  18 #include <arpa/inet.h>
  19 #include <net/if.h>
  20 #include <linux/netfilter.h>
  21 #include <linux/netfilter_ipv4/ip_tables.h>
  22 #include <xtables.h>
  23 #include "utils.h"
  24 #include "tc_util.h"
  25 #include <linux/tc_act/tc_ipt.h>
  26 #include <stdio.h>
  27 #include <getopt.h>
  28 #include <errno.h>
  29 #include <string.h>
  30 #include <netdb.h>
  31 #include <stdlib.h>
  32 #include <ctype.h>
  33 #include <stdarg.h>
  34 #include <limits.h>
  35 #include <unistd.h>
  36 #include <fcntl.h>
  37 #include <sys/wait.h>
  38 #ifdef TC_CONFIG_XT_H
  39 #include "xt-internal.h"
  40 #endif
  41
  42 #ifndef ALIGN
  43 #define ALIGN(x, a)             __ALIGN_MASK(x, (typeof(x))(a)-1)
  44 #define __ALIGN_MASK(x, mask)   (((x)+(mask))&~(mask))
  45 #endif
  46
  47 static const char *pname = "tc-ipt";
  48 static const char *tname = "mangle";
  49 static const char *pversion = "0.2";
  50
  51 static const char *ipthooks[] = {
  52         "NF_IP_PRE_ROUTING",
  53         "NF_IP_LOCAL_IN",
  54         "NF_IP_FORWARD",
  55         "NF_IP_LOCAL_OUT",
  56         "NF_IP_POST_ROUTING",
  57 };
  58
  59 static struct option original_opts[] = {
  60         {"jump", 1, 0, 'j'},
  61         {0, 0, 0, 0}
  62 };
  63
  64 static struct option *opts = original_opts;
  65 static unsigned int global_option_offset;
  66 char *lib_dir;
  67 const char *program_version = XTABLES_VERSION;
  68 const char *program_name = "tc-ipt";
  69 struct afinfo afinfo = {
  70         .family         = AF_INET,
  71         .libprefix      = "libxt_",
  72         .ipproto        = IPPROTO_IP,
  73         .kmod           = "ip_tables",
  74         .so_rev_target  = IPT_SO_GET_REVISION_TARGET,
  75 };
  76
  77
  78 #define OPTION_OFFSET 256
  79
  80 /*XXX: TC_CONFIG_XT_H */
  81 static void free_opts(struct option *local_opts)
  82 {
  83         if (local_opts != original_opts) {
  84                 free(local_opts);
  85                 opts = original_opts;
  86                 global_option_offset = 0;
  87         }
  88 }
  89
  90 /*XXX: TC_CONFIG_XT_H */
  91 static struct option *
  92 merge_options(struct option *oldopts, const struct option *newopts,
  93               unsigned int *option_offset)
  94 {
  95         struct option *merge;
  96         unsigned int num_old, num_new, i;
  97
  98         for (num_old = 0; oldopts[num_old].name; num_old++);
  99         for (num_new = 0; newopts[num_new].name; num_new++);
 100
 101         *option_offset = global_option_offset + OPTION_OFFSET;
 102
 103         merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
 104         memcpy(merge, oldopts, num_old * sizeof(struct option));
 105         for (i = 0; i < num_new; i++) {
 106                 merge[num_old + i] = newopts[i];
 107                 merge[num_old + i].val += *option_offset;
 108         }
 109         memset(merge + num_old + num_new, 0, sizeof(struct option));
 110
 111         return merge;
 112 }
 113
 114
 115 /*XXX: TC_CONFIG_XT_H */
 116 #ifndef TRUE
 117 #define TRUE 1
 118 #endif
 119 #ifndef FALSE
 120 #define FALSE 0
 121 #endif
 122
 123 /*XXX: TC_CONFIG_XT_H */
 124 int
 125 check_inverse(const char option[], int *invert, int *my_optind, int argc)
 126 {
 127         if (option && strcmp(option, "!") == 0) {
 128                 if (*invert)
 129                         exit_error(PARAMETER_PROBLEM,
 130                                    "Multiple `!' flags not allowed");
 131                 *invert = TRUE;
 132                 if (my_optind != NULL) {
 133                         ++*my_optind;
 134                         if (argc && *my_optind > argc)
 135                                 exit_error(PARAMETER_PROBLEM,
 136                                            "no argument following `!'");
 137                 }
 138
 139                 return TRUE;
 140         }
 141         return FALSE;
 142 }
 143
 144 /*XXX: TC_CONFIG_XT_H */
 145 void exit_error(enum exittype status, const char *msg, ...)
 146 {
 147         va_list args;
 148
 149         va_start(args, msg);
 150         fprintf(stderr, "%s v%s: ", pname, pversion);
 151         vfprintf(stderr, msg, args);
 152         va_end(args);
 153         fprintf(stderr, "\n");
 154         /* On error paths, make sure that we don't leak memory */
 155         exit(status);
 156 }
 157
 158 /*XXX: TC_CONFIG_XT_H */
 159 static void set_revision(char *name, u_int8_t revision)
 160 {
 161         /* Old kernel sources don't have ".revision" field,
 162         *  but we stole a byte from name. */
 163         name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0';
 164         name[IPT_FUNCTION_MAXNAMELEN - 1] = revision;
 165 }
 166
 167 /*
 168  * we may need to check for version mismatch
 169 */
 170 int
 171 build_st(struct xtables_target *target, struct xt_entry_target *t)
 172 {
 173
 174         size_t size =
 175                     XT_ALIGN(sizeof(struct xt_entry_target)) + target->size;
 176
 177         if (t == NULL) {
 178                 target->t = fw_calloc(1, size);
 179                 target->t->u.target_size = size;
 180                 strcpy(target->t->u.user.name, target->name);
 181                 set_revision(target->t->u.user.name, target->revision);
 182
 183                 if (target->init != NULL)
 184                         target->init(target->t);
 185         } else {
 186                 target->t = t;
 187         }
 188         return 0;
 189
 190 }
 191
 192 inline void set_lib_dir(void)
 193 {
 194
 195         lib_dir = getenv("XTABLES_LIBDIR");
 196         if (!lib_dir) {
 197                 lib_dir = getenv("IPTABLES_LIB_DIR");
 198                 if (lib_dir)
 199                         fprintf(stderr, "using deprecated IPTABLES_LIB_DIR\n");
 200         }
 201         if (lib_dir == NULL)
 202                 lib_dir = XT_LIB_DIR;
 203
 204 }
 205
 206 static int parse_ipt(struct action_util *a, int *argc_p,
 207                      char ***argv_p, int tca_id, struct nlmsghdr *n)
 208 {
 209         struct xtables_target *m = NULL;
 210         struct ipt_entry fw;
 211         struct rtattr *tail;
 212         int c;
 213         int rargc = *argc_p;
 214         char **argv = *argv_p;
 215         int argc = 0, iargc = 0;
 216         char k[FILTER_NAMESZ];
 217         int size = 0;
 218         int iok = 0, ok = 0;
 219         __u32 hook = 0, index = 0;
 220
 221         set_lib_dir();
 222
 223         {
 224                 int i;
 225
 226                 for (i = 0; i < rargc; i++) {
 227                         if (!argv[i] || strcmp(argv[i], "action") == 0)
 228                                 break;
 229                 }
 230                 iargc = argc = i;
 231         }
 232
 233         if (argc <= 2) {
 234                 fprintf(stderr, "bad arguments to ipt %d vs %d\n", argc, rargc);
 235                 return -1;
 236         }
 237
 238         while (1) {
 239                 c = getopt_long(argc, argv, "j:", opts, NULL);
 240                 if (c == -1)
 241                         break;
 242                 switch (c) {
 243                 case 'j':
 244                         m = find_target(optarg, TRY_LOAD);
 245                         if (m != NULL) {
 246
 247                                 if (build_st(m, NULL) < 0) {
 248                                         printf(" %s error\n", m->name);
 249                                         return -1;
 250                                 }
 251                                 opts =
 252                                     merge_options(opts, m->extra_opts,
 253                                                   &m->option_offset);
 254                         } else {
 255                                 fprintf(stderr, " failed to find target %s\n\n", optarg);
 256                                 return -1;
 257                         }
 258                         ok++;
 259                         break;
 260
 261                 default:
 262                         memset(&fw, 0, sizeof(fw));
 263                         if (m) {
 264                                 m->parse(c - m->option_offset, argv, 0,
 265                                          &m->tflags, NULL, &m->t);
 266                         } else {
 267                                 fprintf(stderr, " failed to find target %s\n\n", optarg);
 268                                 return -1;
 269
 270                         }
 271                         ok++;
 272                         break;
 273
 274                 }
 275         }
 276
 277         if (iargc > optind) {
 278                 if (matches(argv[optind], "index") == 0) {
 279                         if (get_u32(&index, argv[optind + 1], 10)) {
 280                                 fprintf(stderr, "Illegal \"index\"\n");
 281                                 free_opts(opts);
 282                                 return -1;
 283                         }
 284                         iok++;
 285
 286                         optind += 2;
 287                 }
 288         }
 289
 290         if (!ok && !iok) {
 291                 fprintf(stderr, " ipt Parser BAD!! (%s)\n", *argv);
 292                 return -1;
 293         }
 294
 295         /* check that we passed the correct parameters to the target */
 296         if (m)
 297                 m->final_check(m->tflags);
 298
 299         {
 300                 struct tcmsg *t = NLMSG_DATA(n);
 301
 302                 if (t->tcm_parent != TC_H_ROOT
 303                     && t->tcm_parent == TC_H_MAJ(TC_H_INGRESS)) {
 304                         hook = NF_IP_PRE_ROUTING;
 305                 } else {
 306                         hook = NF_IP_POST_ROUTING;
 307                 }
 308         }
 309
 310         tail = addattr_nest(n, MAX_MSG, tca_id);
 311         fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
 312         fprintf(stdout, "\ttarget: ");
 313
 314         if (m)
 315                 m->print(NULL, m->t, 0);
 316         fprintf(stdout, " index %d\n", index);
 317
 318         if (strlen(tname) > 16) {
 319                 size = 16;
 320                 k[15] = 0;
 321         } else {
 322                 size = 1 + strlen(tname);
 323         }
 324         strncpy(k, tname, size);
 325
 326         addattr_l(n, MAX_MSG, TCA_IPT_TABLE, k, size);
 327         addattr_l(n, MAX_MSG, TCA_IPT_HOOK, &hook, 4);
 328         addattr_l(n, MAX_MSG, TCA_IPT_INDEX, &index, 4);
 329         if (m)
 330                 addattr_l(n, MAX_MSG, TCA_IPT_TARG, m->t, m->t->u.target_size);
 331         addattr_nest_end(n, tail);
 332
 333         argc -= optind;
 334         argv += optind;
 335         *argc_p = rargc - iargc;
 336         *argv_p = argv;
 337
 338         optind = 0;
 339         free_opts(opts);
 340         /* Clear flags if target will be used again */
 341         m->tflags = 0;
 342         m->used = 0;
 343         /* Free allocated memory */
 344         if (m->t)
 345             free(m->t);
 346
 347
 348         return 0;
 349
 350 }
 351
 352 static int
 353 print_ipt(struct action_util *au, FILE * f, struct rtattr *arg)
 354 {
 355         struct rtattr *tb[TCA_IPT_MAX + 1];
 356         struct xt_entry_target *t = NULL;
 357         struct xtables_target *m;
 358         __u32 hook;
 359
 360         if (arg == NULL)
 361                 return -1;
 362
 363         set_lib_dir();
 364
 365         parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
 366
 367         if (tb[TCA_IPT_TABLE] == NULL) {
 368                 fprintf(stderr, "Missing ipt table name, assuming mangle\n");
 369         } else {
 370                 fprintf(f, "tablename: %s ",
 371                         rta_getattr_str(tb[TCA_IPT_TABLE]));
 372         }
 373
 374         if (tb[TCA_IPT_HOOK] == NULL) {
 375                 fprintf(stderr, "Missing ipt hook name\n");
 376                 return -1;
 377         }
 378
 379         if (tb[TCA_IPT_TARG] == NULL) {
 380                 fprintf(stderr, "Missing ipt target parameters\n");
 381                 return -1;
 382         }
 383
 384         hook = rta_getattr_u32(tb[TCA_IPT_HOOK]);
 385         fprintf(f, " hook: %s\n", ipthooks[hook]);
 386
 387         t = RTA_DATA(tb[TCA_IPT_TARG]);
 388         m = find_target(t->u.user.name, TRY_LOAD);
 389         if (m != NULL) {
 390                 if (build_st(m, t) < 0) {
 391                         fprintf(stderr, " %s error\n", m->name);
 392                         return -1;
 393                 }
 394
 395                 opts =
 396                         merge_options(opts, m->extra_opts,
 397                                       &m->option_offset);
 398         } else {
 399                 fprintf(stderr, " failed to find target %s\n\n",
 400                         t->u.user.name);
 401                 return -1;
 402         }
 403         fprintf(f, "\ttarget ");
 404         m->print(NULL, m->t, 0);
 405         if (tb[TCA_IPT_INDEX] == NULL) {
 406                 fprintf(f, " [NULL ipt target index ]\n");
 407         } else {
 408                 __u32 index;
 409
 410                 index = rta_getattr_u32(tb[TCA_IPT_INDEX]);
 411                 fprintf(f, "\n\tindex %u", index);
 412         }
 413
 414         if (tb[TCA_IPT_CNT]) {
 415                 struct tc_cnt *c  = RTA_DATA(tb[TCA_IPT_CNT]);
 416
 417                 fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt);
 418         }
 419         if (show_stats) {
 420                 if (tb[TCA_IPT_TM]) {
 421                         struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]);
 422
 423                         print_tm(f, tm);
 424                 }
 425         }
 426         fprintf(f, "\n");
 427
 428         free_opts(opts);
 429
 430         return 0;
 431 }
 432
 433 struct action_util ipt_action_util = {
 434         .id = "ipt",
 435         .parse_aopt = parse_ipt,
 436         .print_aopt = print_ipt,
 437 };