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 <syslog.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <net/if.h>
  21 #include <linux/netfilter.h>
  22 #include <linux/netfilter_ipv4/ip_tables.h>
  23 #include <xtables.h>
  24 #include "utils.h"
  25 #include "tc_util.h"
  26 #include <linux/tc_act/tc_ipt.h>
  27 #include <stdio.h>
  28 #include <getopt.h>
  29 #include <errno.h>
  30 #include <string.h>
  31 #include <netdb.h>
  32 #include <stdlib.h>
  33 #include <ctype.h>
  34 #include <stdarg.h>
  35 #include <limits.h>
  36 #include <unistd.h>
  37 #include <fcntl.h>
  38 #include <sys/wait.h>
  39 #ifdef TC_CONFIG_XT_H
  40 #include "xt-internal.h"
  41 #endif
  42
  43 #ifndef ALIGN
  44 #define ALIGN(x, a)             __ALIGN_MASK(x, (typeof(x))(a)-1)
  45 #define __ALIGN_MASK(x, mask)   (((x)+(mask))&~(mask))
  46 #endif
  47
  48 static const char *pname = "tc-ipt";
  49 static const char *tname = "mangle";
  50 static const char *pversion = "0.2";
  51
  52 static const char *ipthooks[] = {
  53         "NF_IP_PRE_ROUTING",
  54         "NF_IP_LOCAL_IN",
  55         "NF_IP_FORWARD",
  56         "NF_IP_LOCAL_OUT",
  57         "NF_IP_POST_ROUTING",
  58 };
  59
  60 static struct option original_opts[] = {
  61         {"jump", 1, 0, 'j'},
  62         {0, 0, 0, 0}
  63 };
  64
  65 static struct option *opts = original_opts;
  66 static unsigned int global_option_offset;
  67 char *lib_dir;
  68 const char *program_version = XTABLES_VERSION;
  69 const char *program_name = "tc-ipt";
  70 struct afinfo afinfo = {
  71         .family         = AF_INET,
  72         .libprefix      = "libxt_",
  73         .ipproto        = IPPROTO_IP,
  74         .kmod           = "ip_tables",
  75         .so_rev_target  = IPT_SO_GET_REVISION_TARGET,
  76 };
  77
  78
  79 #define OPTION_OFFSET 256
  80
  81 /*XXX: TC_CONFIG_XT_H */
  82 static void free_opts(struct option *local_opts)
  83 {
  84         if (local_opts != original_opts) {
  85                 free(local_opts);
  86                 opts = original_opts;
  87                 global_option_offset = 0;
  88         }
  89 }
  90
  91 /*XXX: TC_CONFIG_XT_H */
  92 static struct option *
  93 merge_options(struct option *oldopts, const struct option *newopts,
  94               unsigned int *option_offset)
  95 {
  96         struct option *merge;
  97         unsigned int num_old, num_new, i;
  98
  99         for (num_old = 0; oldopts[num_old].name; num_old++);
 100         for (num_new = 0; newopts[num_new].name; num_new++);
 101
 102         *option_offset = global_option_offset + OPTION_OFFSET;
 103
 104         merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
 105         memcpy(merge, oldopts, num_old * sizeof(struct option));
 106         for (i = 0; i < num_new; i++) {
 107                 merge[num_old + i] = newopts[i];
 108                 merge[num_old + i].val += *option_offset;
 109         }
 110         memset(merge + num_old + num_new, 0, sizeof(struct option));
 111
 112         return merge;
 113 }
 114
 115
 116 /*XXX: TC_CONFIG_XT_H */
 117 #ifndef TRUE
 118 #define TRUE 1
 119 #endif
 120 #ifndef FALSE
 121 #define FALSE 0
 122 #endif
 123
 124 /*XXX: TC_CONFIG_XT_H */
 125 int
 126 check_inverse(const char option[], int *invert, int *my_optind, int argc)
 127 {
 128         if (option && strcmp(option, "!") == 0) {
 129                 if (*invert)
 130                         exit_error(PARAMETER_PROBLEM,
 131                                    "Multiple `!' flags not allowed");
 132                 *invert = TRUE;
 133                 if (my_optind != NULL) {
 134                         ++*my_optind;
 135                         if (argc && *my_optind > argc)
 136                                 exit_error(PARAMETER_PROBLEM,
 137                                            "no argument following `!'");
 138                 }
 139
 140                 return TRUE;
 141         }
 142         return FALSE;
 143 }
 144
 145 /*XXX: TC_CONFIG_XT_H */
 146 void exit_error(enum exittype status, const char *msg, ...)
 147 {
 148         va_list args;
 149
 150         va_start(args, msg);
 151         fprintf(stderr, "%s v%s: ", pname, pversion);
 152         vfprintf(stderr, msg, args);
 153         va_end(args);
 154         fprintf(stderr, "\n");
 155         /* On error paths, make sure that we don't leak memory */
 156         exit(status);
 157 }
 158
 159 /*XXX: TC_CONFIG_XT_H */
 160 static void set_revision(char *name, u_int8_t revision)
 161 {
 162         /* Old kernel sources don't have ".revision" field,
 163         *  but we stole a byte from name. */
 164         name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0';
 165         name[IPT_FUNCTION_MAXNAMELEN - 1] = revision;
 166 }
 167
 168 /*
 169  * we may need to check for version mismatch
 170 */
 171 int
 172 build_st(struct xtables_target *target, struct xt_entry_target *t)
 173 {
 174
 175         size_t size =
 176                     XT_ALIGN(sizeof(struct xt_entry_target)) + target->size;
 177
 178         if (t == NULL) {
 179                 target->t = fw_calloc(1, size);
 180                 target->t->u.target_size = size;
 181                 strcpy(target->t->u.user.name, target->name);
 182                 set_revision(target->t->u.user.name, target->revision);
 183
 184                 if (target->init != NULL)
 185                         target->init(target->t);
 186         } else {
 187                 target->t = t;
 188         }
 189         return 0;
 190
 191 }
 192
 193 inline void set_lib_dir(void)
 194 {
 195
 196         lib_dir = getenv("XTABLES_LIBDIR");
 197         if (!lib_dir) {
 198                 lib_dir = getenv("IPTABLES_LIB_DIR");
 199                 if (lib_dir)
 200                         fprintf(stderr, "using deprecated IPTABLES_LIB_DIR\n");
 201         }
 202         if (lib_dir == NULL)
 203                 lib_dir = XT_LIB_DIR;
 204
 205 }
 206
 207 static int parse_ipt(struct action_util *a, int *argc_p,
 208                      char ***argv_p, int tca_id, struct nlmsghdr *n)
 209 {
 210         struct xtables_target *m = NULL;
 211         struct ipt_entry fw;
 212         struct rtattr *tail;
 213         int c;
 214         int rargc = *argc_p;
 215         char **argv = *argv_p;
 216         int argc = 0, iargc = 0;
 217         char k[16];
 218         int size = 0;
 219         int iok = 0, ok = 0;
 220         __u32 hook = 0, index = 0;
 221
 222         set_lib_dir();
 223
 224         {
 225                 int i;
 226
 227                 for (i = 0; i < rargc; i++) {
 228                         if (NULL == argv[i] || 0 == strcmp(argv[i], "action")) {
 229                                 break;
 230                         }
 231                 }
 232                 iargc = argc = i;
 233         }
 234
 235         if (argc <= 2) {
 236                 fprintf(stderr, "bad arguments to ipt %d vs %d\n", argc, rargc);
 237                 return -1;
 238         }
 239
 240         while (1) {
 241                 c = getopt_long(argc, argv, "j:", opts, NULL);
 242                 if (c == -1)
 243                         break;
 244                 switch (c) {
 245                 case 'j':
 246                         m = find_target(optarg, TRY_LOAD);
 247                         if (m != NULL) {
 248
 249                                 if (build_st(m, NULL) < 0) {
 250                                         printf(" %s error\n", m->name);
 251                                         return -1;
 252                                 }
 253                                 opts =
 254                                     merge_options(opts, m->extra_opts,
 255                                                   &m->option_offset);
 256                         } else {
 257                                 fprintf(stderr, " failed to find target %s\n\n", optarg);
 258                                 return -1;
 259                         }
 260                         ok++;
 261                         break;
 262
 263                 default:
 264                         memset(&fw, 0, sizeof(fw));
 265                         if (m) {
 266                                 m->parse(c - m->option_offset, argv, 0,
 267                                          &m->tflags, NULL, &m->t);
 268                         } else {
 269                                 fprintf(stderr, " failed to find target %s\n\n", optarg);
 270                                 return -1;
 271
 272                         }
 273                         ok++;
 274                         break;
 275
 276                 }
 277         }
 278
 279         if (iargc > optind) {
 280                 if (matches(argv[optind], "index") == 0) {
 281                         if (get_u32(&index, argv[optind + 1], 10)) {
 282                                 fprintf(stderr, "Illegal \"index\"\n");
 283                                 free_opts(opts);
 284                                 return -1;
 285                         }
 286                         iok++;
 287
 288                         optind += 2;
 289                 }
 290         }
 291
 292         if (!ok && !iok) {
 293                 fprintf(stderr, " ipt Parser BAD!! (%s)\n", *argv);
 294                 return -1;
 295         }
 296
 297         /* check that we passed the correct parameters to the target */
 298         if (m)
 299                 m->final_check(m->tflags);
 300
 301         {
 302                 struct tcmsg *t = NLMSG_DATA(n);
 303
 304                 if (t->tcm_parent != TC_H_ROOT
 305                     && t->tcm_parent == TC_H_MAJ(TC_H_INGRESS)) {
 306                         hook = NF_IP_PRE_ROUTING;
 307                 } else {
 308                         hook = NF_IP_POST_ROUTING;
 309                 }
 310         }
 311
 312         tail = NLMSG_TAIL(n);
 313         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 314         fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
 315         fprintf(stdout, "\ttarget: ");
 316
 317         if (m)
 318                 m->print(NULL, m->t, 0);
 319         fprintf(stdout, " index %d\n", index);
 320
 321         if (strlen(tname) > 16) {
 322                 size = 16;
 323                 k[15] = 0;
 324         } else {
 325                 size = 1 + strlen(tname);
 326         }
 327         strncpy(k, tname, size);
 328
 329         addattr_l(n, MAX_MSG, TCA_IPT_TABLE, k, size);
 330         addattr_l(n, MAX_MSG, TCA_IPT_HOOK, &hook, 4);
 331         addattr_l(n, MAX_MSG, TCA_IPT_INDEX, &index, 4);
 332         if (m)
 333                 addattr_l(n, MAX_MSG, TCA_IPT_TARG, m->t, m->t->u.target_size);
 334         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 335
 336         argc -= optind;
 337         argv += optind;
 338         *argc_p = rargc - iargc;
 339         *argv_p = argv;
 340
 341         optind = 0;
 342         free_opts(opts);
 343         /* Clear flags if target will be used again */
 344         m->tflags = 0;
 345         m->used = 0;
 346         /* Free allocated memory */
 347         if (m->t)
 348             free(m->t);
 349
 350
 351         return 0;
 352
 353 }
 354
 355 static int
 356 print_ipt(struct action_util *au, FILE * f, struct rtattr *arg)
 357 {
 358         struct rtattr *tb[TCA_IPT_MAX + 1];
 359         struct xt_entry_target *t = NULL;
 360
 361         if (arg == NULL)
 362                 return -1;
 363
 364         set_lib_dir();
 365
 366         parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
 367
 368         if (tb[TCA_IPT_TABLE] == NULL) {
 369                 fprintf(f, "[NULL ipt table name ] assuming mangle ");
 370         } else {
 371                 fprintf(f, "tablename: %s ",
 372                         rta_getattr_str(tb[TCA_IPT_TABLE]));
 373         }
 374
 375         if (tb[TCA_IPT_HOOK] == NULL) {
 376                 fprintf(f, "[NULL ipt hook name ]\n ");
 377                 return -1;
 378         } else {
 379                 __u32 hook;
 380
 381                 hook = rta_getattr_u32(tb[TCA_IPT_HOOK]);
 382                 fprintf(f, " hook: %s\n", ipthooks[hook]);
 383         }
 384
 385         if (tb[TCA_IPT_TARG] == NULL) {
 386                 fprintf(f, "\t[NULL ipt target parameters ]\n");
 387                 return -1;
 388         } else {
 389                 struct xtables_target *m = NULL;
 390
 391                 t = RTA_DATA(tb[TCA_IPT_TARG]);
 392                 m = find_target(t->u.user.name, TRY_LOAD);
 393                 if (m != NULL) {
 394                         if (build_st(m, t) < 0) {
 395                                 fprintf(stderr, " %s error\n", m->name);
 396                                 return -1;
 397                         }
 398
 399                         opts =
 400                             merge_options(opts, m->extra_opts,
 401                                           &m->option_offset);
 402                 } else {
 403                         fprintf(stderr, " failed to find target %s\n\n",
 404                                 t->u.user.name);
 405                         return -1;
 406                 }
 407                 fprintf(f, "\ttarget ");
 408                 m->print(NULL, m->t, 0);
 409                 if (tb[TCA_IPT_INDEX] == NULL) {
 410                         fprintf(f, " [NULL ipt target index ]\n");
 411                 } else {
 412                         __u32 index;
 413
 414                         index = rta_getattr_u32(tb[TCA_IPT_INDEX]);
 415                         fprintf(f, "\n\tindex %d", index);
 416                 }
 417
 418                 if (tb[TCA_IPT_CNT]) {
 419                         struct tc_cnt *c  = RTA_DATA(tb[TCA_IPT_CNT]);
 420
 421                         fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt);
 422                 }
 423                 if (show_stats) {
 424                         if (tb[TCA_IPT_TM]) {
 425                                 struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]);
 426
 427                                 print_tm(f, tm);
 428                         }
 429                 }
 430                 fprintf(f, "\n");
 431
 432         }
 433         free_opts(opts);
 434
 435         return 0;
 436 }
 437
 438 struct action_util ipt_action_util = {
 439         .id = "ipt",
 440         .parse_aopt = parse_ipt,
 441         .print_aopt = print_ipt,
 442 };