src/helper/helper-nfacct-rule.c

   1 /*
   2  * Copyright (c) 2016 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <errno.h>
  18 #include <inttypes.h>
  19 #include <stdbool.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <sys/types.h>
  23 #include <sys/wait.h>
  24 #include <unistd.h>
  25 #include <arpa/inet.h>
  26
  27 #include "counter.h"
  28 #include "helper-nfacct-rule.h"
  29
  30 #include "configure_stub.h"
  31
  32 #define IPTABLES "/usr/sbin/iptables"
  33 #define IP6TABLES "/usr/sbin/ip6tables"
  34 #define IPTABLES_CHECK "-C"
  35 #define APPEND "-A"
  36 #define DELETE "-D"
  37 #define INSERT "-I"
  38
  39 #define NFACCT_NAME_MOD " -m nfacct --nfacct-name %s"
  40 #define REJECT_RULE " -j REJECT"
  41 #define ACCEPT_RULE " -j ACCEPT"
  42 #define OUT_RULE "OUTPUT"
  43 #define IN_RULE "INPUT"
  44 #define FORWARD_RULE "FORWARD"
  45
  46 /* TODO idea to use the same rule both for BLOCK (REJECT) and WARNING (ACCEPT) */
  47 #define RULE_APP_OUT "%s -w %s OUTPUT -o %s -m cgroup --cgroup %u %s %s"
  48 #define RULE_APP_IN "%s -w %s INPUT -i %s -m cgroup --cgroup %u %s %s"
  49
  50 /* iptables -w [I/A/D] [OUTPUT/FORWARD/INPUT] -o/-i iface -m nfacct --nfacct-name name -j ACCEPT/REJECT */
  51
  52 #define RULE_IFACE_OUT "%s -w %s %s -o %s %s %s"
  53 #define RULE_IFACE_IN "%s -w %s %s -i %s %s  %s"
  54
  55 #define NFNL_SUBSYS_ACCT                7
  56 #define BUF_SIZE_FOR_ERR 100
  57
  58 static void prepare_netlink_msg(struct genl *req, int type, int flag)
  59 {
  60         int seq = time(NULL);
  61         memset(req, 0, sizeof(struct genl));
  62         req->n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
  63         req->n.nlmsg_type = (NFNL_SUBSYS_ACCT << 8) | type;
  64         req->n.nlmsg_flags = NLM_F_REQUEST | flag;
  65         req->n.nlmsg_seq = seq;
  66 }
  67
  68 static void add_value_attr(struct genl *req, const void *data, int len,
  69                            int type)
  70 {
  71         int payload;
  72         /* get tail */
  73         struct nlattr *na = (struct nlattr *)((char *)req +
  74                                               NLMSG_ALIGN(req->n.nlmsg_len));
  75
  76         na->nla_type = type;
  77         payload = len + NLA_HDRLEN;
  78         na->nla_len = payload;
  79         memcpy(NLA_DATA(na), data, len);
  80         req->n.nlmsg_len += NLMSG_ALIGN(payload);
  81 }
  82
  83 /*
  84  * following 2 function should be used in combination.
  85  * start_nest_attr returns nlattr structure, which should be completed by
  86  * end_nest_attr,
  87  * before these invocations any number of netlink arguments could be inserted
  88  * */
  89 static struct nlattr *start_nest_attr(struct genl *req, uint16_t type)
  90 {
  91         struct nlattr *start = (struct nlattr *)((char *)req +
  92                                                  NLMSG_ALIGN(req->n.nlmsg_len));
  93
  94         start->nla_type = NLA_F_NESTED | type;
  95         req->n.nlmsg_len += NLMSG_ALIGN(sizeof(struct nlattr));
  96         return start;
  97 }
  98
  99 static void end_nest_attr(struct genl *req, struct nlattr *start)
 100 {
 101         start->nla_len = (__u16)((char *)req +
 102                                  NLMSG_ALIGN(req->n.nlmsg_len) - (char *)start);
 103 }
 104
 105 static void add_string_attr(struct genl *req, const char *str, int type)
 106 {
 107         add_value_attr(req, str, strlen(str) + 1, type);
 108 }
 109
 110 static void add_uint64_attr(struct genl *req, const uint64_t v, int type)
 111 {
 112         add_value_attr(req, &v, sizeof(v), type);
 113 }
 114
 115 /* macros or templare, due uint64 and uint32 is the same functions */
 116 static void add_uint32_attr(struct genl *req, const uint32_t v, int type)
 117 {
 118         add_value_attr(req, &v, sizeof(v), type);
 119 }
 120
 121 static stc_error_e send_nfacct_request(int sock, struct genl *req)
 122 {
 123         struct sockaddr_nl nladdr = {.nl_family = AF_NETLINK};
 124         int ret = sendto(sock, (char *)(&req->n), req->n.nlmsg_len, 0,
 125                          (struct sockaddr *)&nladdr, sizeof(nladdr));
 126         ret_value_msg_if(ret < 0, STC_ERROR_FAIL,
 127                          "Failed to send nfacct request, error [%d]", ret);
 128
 129         return STC_ERROR_NONE;
 130 }
 131
 132 static stc_error_e nfacct_send_new(nfacct_rule_s *counter)
 133 {
 134         struct genl req;
 135
 136         prepare_netlink_msg(&req, NFNL_MSG_ACCT_NEW, NLM_F_CREATE | NLM_F_ACK);
 137         add_string_attr(&req, counter->name, NFACCT_NAME);
 138
 139         STC_LOGD("counter name %s", counter->name);
 140
 141         /* padding */
 142         add_uint64_attr(&req, 0, NFACCT_PKTS);
 143         add_uint64_attr(&req, 0, NFACCT_BYTES);
 144         if (counter->quota) {
 145                 STC_LOGD("quota bytes %"PRId64, counter->quota);
 146
 147                 add_uint32_attr(&req, htobe32(NFACCT_F_QUOTA_BYTES),
 148                                 NFACCT_FLAGS);
 149                 add_uint64_attr(&req, htobe64(counter->quota), NFACCT_QUOTA);
 150         }
 151
 152         return send_nfacct_request(counter->carg->sock, &req);
 153 }
 154
 155 stc_error_e nfacct_send_del(nfacct_rule_s *counter)
 156 {
 157         struct genl req;
 158
 159 #if STC_DEBUG_LOG
 160         STC_LOGD("send remove request for %s", counter->name);
 161 #endif
 162
 163         prepare_netlink_msg(&req, NFNL_MSG_ACCT_DEL, NLM_F_ACK);
 164         add_string_attr(&req, counter->name, NFACCT_NAME);
 165         return send_nfacct_request(counter->carg->sock, &req);
 166 }
 167 #define NFACCT_F_QUOTAS (NFACCT_F_QUOTA_BYTES | NFACCT_F_QUOTA_PKTS)
 168
 169 static stc_error_e internal_nfacct_send_get(struct counter_arg *carg,
 170                                             enum nfnl_acct_msg_types get_type,
 171                                             const char *name,
 172                                             int mask, int filter)
 173 {
 174         struct genl req;
 175         struct nlattr *na;
 176         int flag = !name ? NLM_F_DUMP : 0;
 177         prepare_netlink_msg(&req, get_type,
 178                             flag);
 179         /* due we don't get counter with quota any where else,
 180          * here we will request just counters by default */
 181         if (name)
 182                 add_string_attr(&req, name, NFACCT_NAME);
 183
 184         na = start_nest_attr(&req, NFACCT_FILTER);
 185         add_uint32_attr(&req, htonl(mask),
 186                         NFACCT_FILTER_ATTR_MASK);
 187         add_uint32_attr(&req, htonl(filter), NFACCT_FILTER_ATTR_VALUE);
 188         end_nest_attr(&req, na);
 189         return send_nfacct_request(carg->sock, &req);
 190 }
 191
 192 stc_error_e nfacct_send_get_counters(struct counter_arg *carg, const char *name)
 193 {
 194         /* get and reset countes value */
 195         return internal_nfacct_send_get(carg, NFNL_MSG_ACCT_GET_CTRZERO, name,
 196                                         NFACCT_F_QUOTAS, 0);
 197 }
 198
 199 stc_error_e nfacct_send_get_quotas(struct counter_arg *carg, const char *name)
 200 {
 201         /* just get counters */
 202         return internal_nfacct_send_get(carg, NFNL_MSG_ACCT_GET, name,
 203                                         NFACCT_F_QUOTA_BYTES,
 204                                         NFACCT_F_QUOTA_BYTES);
 205 }
 206
 207 stc_error_e nfacct_send_get_all(struct counter_arg *carg)
 208 {
 209         /* get and reset everything, used when quiting */
 210         return internal_nfacct_send_get(carg, NFNL_MSG_ACCT_GET_CTRZERO, NULL,
 211                                         0, 0);
 212 }
 213
 214 stc_error_e nfacct_send_get(nfacct_rule_s *rule)
 215 {
 216         if (rule->intend == NFACCT_BLOCK || rule->intend == NFACCT_WARN)
 217                 return nfacct_send_get_quotas(rule->carg, rule->name);
 218         else if (rule->intend == NFACCT_COUNTER)
 219                 return nfacct_send_get_counters(rule->carg, rule->name);
 220
 221         return STC_ERROR_INVALID_PARAMETER;
 222 }
 223
 224 static nfacct_rule_direction convert_to_iotype(int type)
 225 {
 226         return (type < NFACCT_COUNTER_LAST_ELEM &&
 227                 type > NFACCT_COUNTER_UNKNOWN) ? type : NFACCT_COUNTER_UNKNOWN;
 228 }
 229
 230 static stc_iface_type_e convert_to_iftype(int type)
 231 {
 232         return (type < STC_IFACE_LAST_ELEM &&
 233                 type > STC_IFACE_UNKNOWN) ? type : STC_IFACE_UNKNOWN;
 234 }
 235
 236 bool recreate_counter_by_name(char *cnt_name, nfacct_rule_s *cnt)
 237 {
 238         char *iftype_part;
 239         char *classid_part;
 240         char *io_part;
 241         char *ifname_part;
 242         char *save_ptr = NULL;
 243         char name[NFACCT_NAME_MAX] = {0}; /* parse buffer to avoid cnt_name modification */
 244
 245         strncpy(name, cnt_name, sizeof(name) - 1);
 246
 247         switch (name[0]) {
 248         case 'c':
 249                 cnt->intend  = NFACCT_COUNTER;
 250                 break;
 251         case 'w':
 252                 cnt->intend  = NFACCT_WARN;
 253                 break;
 254         case 'r':
 255                 cnt->intend  = NFACCT_BLOCK;
 256                 break;
 257         case 't':
 258                 cnt->intend  = NFACCT_TETH_COUNTER;
 259                 break;
 260         default:
 261                 return false;
 262         }
 263
 264         STRING_SAVE_COPY(cnt->name, cnt_name);
 265
 266         if (cnt->intend == NFACCT_TETH_COUNTER) {
 267                 char ifname_buf[MAX_IFACE_LENGTH];
 268                 int ifname_len;
 269                 stc_iface_type_e iface;
 270                 /* tbnep+:seth_w0; means comes by bt go away by mobile interface,
 271                  * it's outgoing traffic, due all tethering is mobile databased */
 272                 iftype_part = strchr(name, ':');
 273                 ret_value_msg_if(iftype_part == NULL,
 274                                  false, "Invalid format of the tethering counter %s", name);
 275                 ifname_len = iftype_part - name - 1;
 276                 strncpy(ifname_buf, name + 1, ifname_len); /* skip first t */
 277                 ifname_buf[ifname_len] = '\0';
 278                 iface = get_iftype_by_name(ifname_buf);
 279                 /* check first part is it datacall */
 280                 if (iface == STC_IFACE_DATACALL) {
 281                         strncpy(cnt->ifname, ifname_buf, MAX_IFACE_LENGTH);
 282                         cnt->iotype = NFACCT_COUNTER_IN;
 283                 } else {
 284                         /* +1, due : symbol and till the end of cnt_name */
 285                         strncpy(ifname_buf, iftype_part + 1, MAX_IFACE_LENGTH);
 286                         iface = get_iftype_by_name(ifname_buf);
 287                         if (iface == STC_IFACE_DATACALL) {
 288                                 cnt->iotype = NFACCT_COUNTER_OUT;
 289                                 strncpy(cnt->ifname, ifname_buf, MAX_IFACE_LENGTH);
 290                         }
 291                 }
 292
 293                 if (cnt->iotype == NFACCT_COUNTER_UNKNOWN) {
 294                         STC_LOGE("can't determine tethering direction %s", name);
 295                         return false;
 296                 }
 297                 cnt->iftype = STC_IFACE_DATACALL;
 298                 cnt->classid = STC_TETHERING_APP_CLASSID;
 299                 return true;
 300         }
 301
 302         io_part = strtok_r(name, "_", &save_ptr);
 303         if (io_part != NULL)
 304                 cnt->iotype = convert_to_iotype(atoi(io_part + 1));
 305         else
 306                 return false;
 307
 308         iftype_part = strtok_r(NULL, "_", &save_ptr);
 309         if (iftype_part != NULL)
 310                 cnt->iftype = convert_to_iftype(atoi(iftype_part));
 311         else
 312                 return false;
 313
 314         classid_part = strtok_r(NULL, "_", &save_ptr);
 315         if (classid_part != NULL)
 316                 cnt->classid = atoi(classid_part);
 317         else {
 318                 cnt->classid = STC_ALL_APP_CLASSID;
 319                 return cnt->intend == NFACCT_BLOCK ? true : false;
 320         }
 321
 322         ifname_part = strtok_r(NULL, "\0", &save_ptr);
 323         if (ifname_part != NULL)
 324                 STRING_SAVE_COPY(cnt->ifname, ifname_part);
 325         else
 326                 return false;
 327
 328         return true;
 329 }
 330
 331 static void _process_answer(struct netlink_serialization_params *params)
 332 {
 333         struct rtattr *na;
 334         struct rtattr *attr_list[__NFACCT_MAX] = {0};
 335         struct counter_arg *carg = params->carg;
 336         struct genl *ans = params->ans;;
 337         struct nlmsghdr *nlhdr = &ans->n;
 338         int len = GENLMSG_PAYLOAD(nlhdr);
 339         int ans_len = carg->ans_len;
 340
 341         if (len == 0)
 342                 return;
 343
 344         /* parse reply message */
 345         na = (struct rtattr *)GENLMSG_DATA(ans);
 346
 347         while (NLMSG_OK(nlhdr, ans_len)) {
 348                 fill_attribute_list(attr_list, NFACCT_MAX,
 349                                     na, len);
 350                 if (!attr_list[NFACCT_NAME] ||
 351                     !attr_list[NFACCT_BYTES])
 352                         goto next;
 353                 params->eval_attr(attr_list, carg);
 354
 355 next:
 356                 nlhdr = NLMSG_NEXT(nlhdr, ans_len);
 357                 if (ans_len < 0)
 358                         break;
 359                 na = (struct rtattr *)GENLMSG_DATA(nlhdr);
 360         }
 361
 362         if (params->post_eval_attr)
 363                 params->post_eval_attr(carg);
 364 }
 365
 366 netlink_serialization_command *
 367 netlink_create_command(struct netlink_serialization_params *params)
 368 {
 369         static netlink_serialization_command command = {0,};
 370         command.deserialize_answer = _process_answer;
 371         command.params = *params;
 372         return &command;
 373 }
 374
 375 static unsigned int get_args_number(const char *cmd_buf)
 376 {
 377         char *str;
 378         unsigned int count = 0;
 379
 380         for (str = (char *)cmd_buf; *str != '\0'; ++str) {
 381                 if (*str == ' ')
 382                         ++count;
 383         }
 384         return count;
 385 }
 386
 387 static void wait_for_rule_cmd(pid_t pid)
 388 {
 389         int status;
 390         pid_t ret_pid;
 391
 392         if (!pid || pid == -1) {
 393                 STC_LOGD("no need to wait");
 394                 return;
 395         }
 396
 397         ret_pid = waitpid(pid, &status, 0);
 398         if (ret_pid < 0) {
 399                 char buf[BUF_SIZE_FOR_ERR] = { 0 };
 400                 STC_LOGD("can't wait for a pid %d %d %s", pid, status,
 401                          strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 402         }
 403 }
 404
 405 static char* get_cmd_pos(const char *cmd_buf)
 406 {
 407         char *cmd_pos = strstr(cmd_buf, APPEND);
 408         if (!cmd_pos)
 409                 cmd_pos = strstr(cmd_buf, INSERT);
 410
 411         return cmd_pos;
 412 }
 413
 414 static bool is_rule_present(const char *cmd_buf)
 415 {
 416         bool ret = false;
 417         pid_t pid = fork();
 418
 419         if (pid == 0) {
 420                 gchar **args = NULL;
 421                 size_t buf_len;
 422                 char *exec_buf;
 423                 char *cmd_pos = get_cmd_pos(cmd_buf);
 424
 425                 if (!cmd_pos)
 426                         exit(1);
 427
 428                 buf_len = strlen(cmd_buf) + 1;
 429                 exec_buf = (char *)malloc(buf_len);
 430                 if (!exec_buf)
 431                         exit(1);
 432
 433                 strncpy(exec_buf, cmd_buf, buf_len);
 434                 strncpy(exec_buf + (cmd_pos - cmd_buf), IPTABLES_CHECK,
 435                         sizeof(IPTABLES_CHECK) - 1);
 436
 437 #if STC_DEBUG_LOG
 438                 STC_LOGD("check rule %s", exec_buf);
 439 #endif
 440
 441                 args = g_strsplit_set(exec_buf, " ", -1);
 442
 443                 ret = execv(args[0], args);
 444                 if (ret) {
 445                         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 446                         STC_LOGE("Can't execute %s: %s",
 447                                  cmd_buf, strerror_r(errno, buf,
 448                                                      BUF_SIZE_FOR_ERR));
 449                 }
 450
 451                 free(exec_buf);
 452                 g_strfreev(args);
 453                 exit(ret);
 454         }
 455
 456         return ret;
 457 }
 458
 459 stc_error_e exec_iptables_cmd(const char *cmd_buf, pid_t *cmd_pid)
 460 {
 461         const size_t args_number = get_args_number(cmd_buf);
 462         *cmd_pid = 0;
 463
 464         ret_value_msg_if(args_number == 0, STC_ERROR_FAIL, "no arguments");
 465
 466         pid_t pid = fork();
 467
 468         if (pid == 0) {
 469                 char *cmd;
 470                 unsigned int i;
 471                 char *args[args_number + 2];
 472                 int ret;
 473                 char *save_ptr = NULL;
 474
 475 #if STC_DEBUG_LOG
 476                 STC_LOGD("executing iptables cmd %s in forked process", cmd_buf);
 477 #endif
 478
 479                 if (is_rule_present(cmd_buf)) {
 480                         STC_LOGD("Rule %s already present", cmd_buf);
 481                         exit(0);
 482                 }
 483
 484                 args[0] = "iptables";
 485                 cmd = strtok_r((char *)cmd_buf, " ", &save_ptr);
 486                 if (cmd == NULL) {
 487                         STC_LOGE("no arguments");
 488                         exit(-EINVAL);
 489                 }
 490
 491                 for (i = 1; i <= args_number; ++i)
 492                         args[i] = strtok_r(NULL, " ", &save_ptr);
 493
 494                 args[i] = NULL;
 495
 496                 ret = execv(cmd, args);
 497                 if (ret) {
 498                         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 499                         STC_LOGE("Can't execute %s: %s",
 500                                  cmd_buf, strerror_r(errno, buf,
 501                                                      BUF_SIZE_FOR_ERR));
 502                 }
 503                 exit(ret);
 504         }
 505
 506         *cmd_pid = pid;
 507         return STC_ERROR_NONE;
 508 }
 509
 510 stc_error_e exec_ip6tables_cmd(const char *cmd_buf, pid_t *cmd_pid)
 511 {
 512         const size_t args_number = get_args_number(cmd_buf);
 513         *cmd_pid = 0;
 514
 515         ret_value_msg_if(args_number == 0, STC_ERROR_FAIL, "no arguments");
 516
 517         pid_t pid = fork();
 518
 519         if (pid == 0) {
 520                 char *cmd;
 521                 unsigned int i;
 522                 char *args[args_number + 2];
 523                 int ret;
 524                 char *save_ptr = NULL;
 525
 526 #if STC_DEBUG_LOG
 527                 STC_LOGD("executing ip6tables cmd %s in forked process", cmd_buf);
 528 #endif
 529
 530                 if (is_rule_present(cmd_buf)) {
 531                         STC_LOGD("Rule %s already present", cmd_buf);
 532                         exit(0);
 533                 }
 534
 535                 args[0] = "ip6tables";
 536                 cmd = strtok_r((char *)cmd_buf, " ", &save_ptr);
 537                 if (cmd == NULL) {
 538                         STC_LOGE("no arguments");
 539                         exit(-EINVAL);
 540                 }
 541
 542                 for (i = 1; i <= args_number; ++i)
 543                         args[i] = strtok_r(NULL, " ", &save_ptr);
 544
 545                 args[i] = NULL;
 546
 547                 ret = execv(cmd, args);
 548                 if (ret) {
 549                         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 550                         STC_LOGE("Can't execute %s: %s",
 551                                  cmd_buf, strerror_r(errno, buf,
 552                                                      BUF_SIZE_FOR_ERR));
 553                 }
 554                 exit(ret);
 555         }
 556
 557         *cmd_pid = pid;
 558         return STC_ERROR_NONE;
 559 }
 560
 561 static char *choose_iftype_name(nfacct_rule_s *rule)
 562 {
 563         return strlen(rule->ifname) != 0 ? rule->ifname :
 564                 get_iftype_name(rule->iftype);
 565 }
 566
 567 static stc_error_e exec_iface_cmd(const char *pattern, const char *cmd,
 568                                   const char *chain, const char *nfacct,
 569                                   const char *jump, char *iftype_name,
 570                                   pid_t *pid, nfacct_rule_iptype iptype)
 571 {
 572         char block_buf[MAX_PATH_LENGTH];
 573         int ret;
 574         const char *iptables_type = IPTABLES;
 575
 576         ret_value_msg_if(iftype_name == NULL, STC_ERROR_FAIL,
 577                          "Invalid network interface name argument");
 578
 579         if (iptype == NFACCT_TYPE_IPV6)
 580                 iptables_type = IP6TABLES;
 581
 582         ret = snprintf(block_buf, sizeof(block_buf), pattern, iptables_type,
 583                        cmd, chain, iftype_name, nfacct, jump);
 584         ret_value_msg_if(ret > sizeof(block_buf), STC_ERROR_FAIL,
 585                          "Not enough buffer");
 586
 587         if (iptype == NFACCT_TYPE_IPV6)
 588                 exec_ip6tables_cmd(block_buf, pid);
 589         else
 590                 exec_iptables_cmd(block_buf, pid);
 591
 592         wait_for_rule_cmd(*pid);
 593
 594         return STC_ERROR_NONE;
 595 }
 596
 597 static stc_error_e exec_app_cmd(const char *pattern, const char *cmd,
 598                                 const char *nfacct, const char *jump,
 599                                 const uint32_t classid, char *iftype_name,
 600                                 pid_t *pid, nfacct_rule_iptype iptype)
 601 {
 602         char block_buf[MAX_PATH_LENGTH];
 603         int ret;
 604         const char *iptables_type = IPTABLES;
 605
 606         ret_value_msg_if(iftype_name == NULL, STC_ERROR_FAIL,
 607                          "Invalid network interface name argument");
 608
 609         if (iptype == NFACCT_TYPE_IPV6)
 610                 iptables_type = IP6TABLES;
 611
 612         ret = snprintf(block_buf, sizeof(block_buf), pattern, iptables_type,
 613                        cmd, iftype_name, classid, nfacct, jump);
 614         ret_value_msg_if(ret > sizeof(block_buf), STC_ERROR_FAIL,
 615                          "Not enough buffer");
 616
 617         if (iptype == NFACCT_TYPE_IPV6)
 618                 exec_ip6tables_cmd(block_buf, pid);
 619         else
 620                 exec_iptables_cmd(block_buf, pid);
 621
 622         wait_for_rule_cmd(*pid);
 623
 624         return STC_ERROR_NONE;
 625 }
 626
 627 static char *get_iptables_cmd(const nfacct_rule_action action)
 628 {
 629         if (action == NFACCT_ACTION_APPEND)
 630                 return APPEND;
 631         else if (action == NFACCT_ACTION_DELETE)
 632                 return DELETE;
 633         else if (action == NFACCT_ACTION_INSERT)
 634                 return INSERT;
 635
 636         return "";
 637 }
 638
 639 static char *get_iptables_chain(const nfacct_rule_direction iotype)
 640 {
 641         if (iotype == NFACCT_COUNTER_IN)
 642                 return IN_RULE;
 643         else if (iotype == NFACCT_COUNTER_OUT)
 644                 return OUT_RULE;
 645
 646         return "";
 647 }
 648
 649 static char *get_iptables_jump(const nfacct_rule_jump jump)
 650 {
 651         if (jump == NFACCT_JUMP_ACCEPT)
 652                 return ACCEPT_RULE;
 653         else if (jump == NFACCT_JUMP_REJECT)
 654                 return REJECT_RULE;
 655
 656         return "";
 657 }
 658
 659 static stc_error_e produce_app_rule(nfacct_rule_s *rule)
 660 {
 661         if (rule == NULL)
 662                 return STC_ERROR_INVALID_PARAMETER;
 663
 664         char *set_cmd = get_iptables_cmd(rule->action);
 665         char *jump_cmd = get_iptables_jump(rule->jump);
 666         char nfacct_buf[sizeof(NFACCT_NAME_MOD) +
 667                 3*MAX_DEC_SIZE(int) + 4];
 668         stc_error_e ret = STC_ERROR_NONE;
 669         pid_t pid = 0;
 670
 671         /* income part */
 672         if (rule->iotype & NFACCT_COUNTER_IN) {
 673                 rule->quota = rule->rcv_limit;
 674                 rule->iotype = NFACCT_COUNTER_IN;
 675                 generate_counter_name(rule);
 676
 677                 /* to support quated counter we need nfacct,
 678                  *      don't use it in case of just block without a limit
 679                  *      iow, send_limit = 0 and rcv_limit 0 */
 680                 if (rule->action != NFACCT_ACTION_DELETE) {
 681                         ret = nfacct_send_del(rule);
 682                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 683                                          "can't del quota counter");
 684
 685                         ret = nfacct_send_new(rule);
 686                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 687                                          "can't set nfacct counter");
 688                         keep_counter(rule);
 689                 }
 690
 691                 /* we have a counter, let's key in a rule, drop in case of
 692                  *  send_limit/rcv_limit */
 693                 ret = snprintf(nfacct_buf, sizeof(nfacct_buf), NFACCT_NAME_MOD,
 694                                rule->name);
 695                 ret_value_msg_if(ret > sizeof(nfacct_buf) || ret < 0,
 696                                  STC_ERROR_FAIL, "Not enought buffer");
 697
 698                 ret = exec_app_cmd(RULE_APP_IN, set_cmd, nfacct_buf, jump_cmd,
 699                                    rule->classid, choose_iftype_name(rule),
 700                                    &pid, rule->iptype);
 701                 ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 702                                  "Can't set conditional block for ingress"
 703                                  " traffic, for classid %u, cmd %s, j %s",
 704                                  rule->classid, set_cmd, jump_cmd);
 705
 706                 /* remove in any case */
 707                 if (rule->action == NFACCT_ACTION_DELETE) {
 708                         /* TODO here and everywhere should be not just a del,
 709                          *      here should be get counted value and than
 710                          *      set new counter with that value, but it's minor issue,
 711                          *      due it's not clear when actual counters was stored,
 712                          *      and based on which value settings made such decition */
 713                         rule->iptables_rule = nfacct_send_del;
 714                         set_finalize_flag(rule);
 715                         nfacct_send_get(rule);
 716                         ret = nfacct_send_del(rule);
 717                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 718                                          "can't del quota counter");
 719                 }
 720         }
 721
 722         if (rule->iotype & NFACCT_COUNTER_OUT) {
 723                 /* outcome part */
 724                 rule->iotype = NFACCT_COUNTER_OUT;
 725                 rule->quota = rule->send_limit;
 726                 generate_counter_name(rule);
 727                 if (rule->action != NFACCT_ACTION_DELETE) {
 728                         ret = nfacct_send_del(rule);
 729                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 730                                          "can't del quota counter");
 731
 732                         ret = nfacct_send_new(rule);
 733                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 734                                          "can't set quota counter");
 735                         keep_counter(rule);
 736                 }
 737
 738                 ret = snprintf(nfacct_buf, sizeof(nfacct_buf), NFACCT_NAME_MOD,
 739                                rule->name);
 740                 ret_value_msg_if(ret > sizeof(nfacct_buf) || ret < 0,
 741                                  STC_ERROR_FAIL, "Not enought buffer");
 742
 743                 ret = exec_app_cmd(RULE_APP_OUT, set_cmd, nfacct_buf, jump_cmd,
 744                                    rule->classid, choose_iftype_name(rule),
 745                                    &pid, rule->iptype);
 746                 ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 747                                  "Can't set conditional block for engress"
 748                                  " traffic, for classid %u, cmd %s, j %s",
 749                                  rule->classid, set_cmd, jump_cmd);
 750                 if (rule->action == NFACCT_ACTION_DELETE) {
 751                         rule->iptables_rule = nfacct_send_del;
 752                         /* not effective, it's better to replace
 753                          * set_finalize_flag by set_property,
 754                          * due keep_counter it necessary only for
 755                          * setting iptables_rule */
 756                         set_finalize_flag(rule);
 757                         nfacct_send_get(rule);
 758                         ret = nfacct_send_del(rule);
 759                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 760                                          "can't del quota counter");
 761                 }
 762         }
 763         return STC_ERROR_NONE;
 764 }
 765
 766 static stc_error_e produce_iface_rule(nfacct_rule_s *rule)
 767 {
 768         if (rule == NULL)
 769                 return STC_ERROR_INVALID_PARAMETER;
 770
 771         char *set_cmd = get_iptables_cmd(rule->action);
 772         char *jump_cmd = get_iptables_jump(rule->jump);
 773         char nfacct_buf[sizeof(NFACCT_NAME_MOD) +
 774                 3*MAX_DEC_SIZE(int) + 4];
 775         stc_error_e ret;
 776         pid_t pid = 0;
 777
 778         if (rule->iotype & NFACCT_COUNTER_IN) {
 779                 /* income part */
 780                 rule->iotype = NFACCT_COUNTER_IN;
 781                 rule->quota = rule->rcv_limit;
 782                 generate_counter_name(rule);
 783
 784                 if (rule->action != NFACCT_ACTION_DELETE) {
 785                         /* send delete comman in case of creation,
 786                          * because nfacct doesn't reset value for nfacct quota
 787                          * in case of quota existing */
 788                         ret = nfacct_send_del(rule);
 789                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 790                                          "can't del quota counter");
 791
 792                         ret = nfacct_send_new(rule);
 793                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 794                                          "can't set quota counter");
 795                         keep_counter(rule);
 796                 }
 797
 798                 ret = snprintf(nfacct_buf, sizeof(nfacct_buf),
 799                                NFACCT_NAME_MOD, rule->name);
 800                 ret_value_msg_if(ret > sizeof(nfacct_buf) || ret < 0,
 801                                  STC_ERROR_FAIL, "Not enought buffer");
 802
 803                 ret = exec_iface_cmd(RULE_IFACE_IN, set_cmd,
 804                                      get_iptables_chain(rule->iotype),
 805                                      nfacct_buf, jump_cmd,
 806                                      choose_iftype_name(rule), &pid,
 807                                      rule->iptype);
 808                 ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 809                                  "Can't set conditional block for ingress"
 810                                  " traffic, for iftype %d, cmd %s, j %s",
 811                                  rule->iftype, set_cmd, jump_cmd);
 812
 813                 /* for tethering */
 814                 if (rule->intend == NFACCT_WARN ||
 815                     rule->intend == NFACCT_BLOCK) {
 816                         /* RULE_IFACE_OUT is not a misprint here */
 817                         ret = exec_iface_cmd(RULE_IFACE_IN, set_cmd,
 818                                              FORWARD_RULE, nfacct_buf, jump_cmd,
 819                                              choose_iftype_name(rule), &pid,
 820                                              rule->iptype);
 821                         ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 822                                          "Can't set forward rule for ingress "
 823                                          "traffic, for iftype %d, cmd %s, j %s",
 824                                          rule->iftype, set_cmd, jump_cmd);
 825                 }
 826                 /* tethering */
 827
 828                 if (rule->action == NFACCT_ACTION_DELETE) {
 829                         rule->iptables_rule = nfacct_send_del;
 830                         set_finalize_flag(rule);
 831                         nfacct_send_get(rule);
 832                         ret = nfacct_send_del(rule);
 833                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 834                                          "can't del quota counter");
 835                 }
 836         }
 837
 838         if (rule->iotype & NFACCT_COUNTER_OUT) {
 839                 /* outcome part */
 840                 rule->iotype = NFACCT_COUNTER_OUT;
 841                 rule->quota = rule->send_limit;
 842                 generate_counter_name(rule);
 843
 844                 if (rule->action != NFACCT_ACTION_DELETE) {
 845                         /* send delete comman in case of creation,
 846                          * because nfacct doesn't reset value for nfacct quota
 847                          * in case of quota existing */
 848                         ret = nfacct_send_del(rule);
 849                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 850                                          "can't del quota counter");
 851
 852                         ret = nfacct_send_new(rule);
 853                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 854                                          "can't set quota counter");
 855                         keep_counter(rule);
 856                 }
 857
 858                 ret = snprintf(nfacct_buf, sizeof(nfacct_buf),
 859                                NFACCT_NAME_MOD, rule->name);
 860                 ret_value_msg_if(ret > sizeof(nfacct_buf) || ret < 0,
 861                                  STC_ERROR_FAIL, "Not enough buffer");
 862
 863                 ret = exec_iface_cmd(RULE_IFACE_OUT, set_cmd, OUT_RULE,
 864                                      nfacct_buf, jump_cmd,
 865                                      choose_iftype_name(rule), &pid,
 866                                      rule->iptype);
 867                 ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 868                                  "Can't set conditional block for "
 869                                  "engress traffic, for iftype %d, cmd %s, j %s",
 870                                  rule->iftype, set_cmd, jump_cmd);
 871                 /* for tethering  */
 872                 if (rule->intend == NFACCT_WARN ||
 873                     rule->intend == NFACCT_BLOCK) {
 874                         ret = exec_iface_cmd(RULE_IFACE_OUT, set_cmd,
 875                                              FORWARD_RULE, nfacct_buf, jump_cmd,
 876                                              choose_iftype_name(rule), &pid,
 877                                              rule->iptype);
 878                         ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 879                                          "Can't set forward rule for engress "
 880                                          "traffic, for iftype %d, cmd %s, j %s",
 881                                          rule->iftype, set_cmd, jump_cmd);
 882                 }
 883                 /* tethering  */
 884
 885                 if (rule->action == NFACCT_ACTION_DELETE) {
 886                         rule->iptables_rule = nfacct_send_del;
 887                         set_finalize_flag(rule);
 888                         nfacct_send_get(rule);
 889                         ret = nfacct_send_del(rule);
 890                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 891                                          "can't del quota counter");
 892                 }
 893         }
 894         return STC_ERROR_NONE;
 895 }
 896
 897 stc_error_e produce_net_rule(nfacct_rule_s *rule)
 898 {
 899         stc_error_e ret = STC_ERROR_NONE;
 900
 901         if (rule == NULL)
 902                 return STC_ERROR_INVALID_PARAMETER;
 903
 904         if (rule->action == NFACCT_ACTION_APPEND &&
 905             rule->intend == NFACCT_WARN &&
 906             !rule->send_limit && !rule->rcv_limit)
 907                 return STC_ERROR_NONE;
 908
 909         if (rule->classid != STC_ALL_APP_CLASSID &&
 910             rule->classid != STC_TETHERING_APP_CLASSID &&
 911             rule->classid != STC_TOTAL_DATACALL_CLASSID &&
 912             rule->classid != STC_TOTAL_WIFI_CLASSID &&
 913             rule->classid != STC_TOTAL_BLUETOOTH_CLASSID &&
 914             rule->classid != STC_TOTAL_IPV4_CLASSID &&
 915             rule->classid != STC_TOTAL_IPV6_CLASSID)
 916                 ret = produce_app_rule(rule);
 917         else
 918                 ret = produce_iface_rule(rule);
 919
 920         return ret;
 921 }
 922
 923 void generate_counter_name(nfacct_rule_s *counter)
 924 {
 925         char warn_symbol = 'c';
 926         if (!strlen(counter->ifname)) {
 927                 char *iftype_name = get_iftype_name(counter->iftype);
 928                 /* trace counter name, maybe name was already generated */
 929                 ret_msg_if(iftype_name == NULL,
 930                            "Can't get interface name for counter %s, iftype %d)!",
 931                            counter->name, counter->iftype);
 932                 STRING_SAVE_COPY(counter->ifname, iftype_name);
 933         }
 934
 935         if (counter->intend  == NFACCT_WARN)
 936                 warn_symbol = 'w';
 937         else if (counter->intend  == NFACCT_BLOCK)
 938                 warn_symbol = 'r';
 939         snprintf(counter->name, NFACCT_NAME_MAX, "%c%d_%d_%d_%s",
 940                  warn_symbol, counter->iotype, counter->iftype,
 941                  counter->classid, counter->ifname);
 942 }
 943