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
  51 /* iptables -w [I/A/D] [OUTPUT/FORWARD/INPUT] -o/-i iface -m nfacct --nfacct-name name -j ACCEPT/REJECT */
  52
  53 #define RULE_IFACE_OUT "%s -w %s %s -o %s %s %s"
  54 #define RULE_IFACE_IN "%s -w %s %s -i %s %s  %s"
  55
  56
  57 #define NFNL_SUBSYS_ACCT                7
  58 #define BUF_SIZE_FOR_ERR 100
  59
  60 static void prepare_netlink_msg(struct genl *req, int type, int flag)
  61 {
  62         int seq = time(NULL);
  63         memset(req, 0, sizeof(struct genl));
  64         req->n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
  65         req->n.nlmsg_type = (NFNL_SUBSYS_ACCT << 8) | type;
  66         req->n.nlmsg_flags = NLM_F_REQUEST | flag;
  67         req->n.nlmsg_seq = seq;
  68 }
  69
  70 static void add_value_attr(struct genl *req, const void *data, int len,
  71                            int type)
  72 {
  73         int payload;
  74         /* get tail */
  75         struct nlattr *na = (struct nlattr *)((char *)req +
  76                                               NLMSG_ALIGN(req->n.nlmsg_len));
  77
  78         na->nla_type = type;
  79         payload = len + NLA_HDRLEN;
  80         na->nla_len = payload;
  81         memcpy(NLA_DATA(na), data, len);
  82         req->n.nlmsg_len += NLMSG_ALIGN(payload);
  83 }
  84
  85 /*
  86  * following 2 function should be used in combination.
  87  * start_nest_attr returns nlattr structure, which should be completed by
  88  * end_nest_attr,
  89  * before these invocations any number of netlink arguments could be inserted
  90  * */
  91 static struct nlattr *start_nest_attr(struct genl *req, uint16_t type)
  92 {
  93         struct nlattr *start = (struct nlattr *)((char *)req +
  94                                                  NLMSG_ALIGN(req->n.nlmsg_len));
  95
  96         start->nla_type = NLA_F_NESTED | type;
  97         req->n.nlmsg_len += NLMSG_ALIGN(sizeof(struct nlattr));
  98         return start;
  99 }
 100
 101 static void end_nest_attr(struct genl *req, struct nlattr *start)
 102 {
 103         start->nla_len = (__u16)((char *)req +
 104                                  NLMSG_ALIGN(req->n.nlmsg_len) - (char *)start);
 105 }
 106
 107 static void add_string_attr(struct genl *req, const char *str, int type)
 108 {
 109         add_value_attr(req, str, strlen(str) + 1, type);
 110 }
 111
 112 static void add_uint64_attr(struct genl *req, const uint64_t v, int type)
 113 {
 114         add_value_attr(req, &v, sizeof(v), type);
 115 }
 116
 117 /* macros or templare, due uint64 and uint32 is the same functions */
 118 static void add_uint32_attr(struct genl *req, const uint32_t v, int type)
 119 {
 120         add_value_attr(req, &v, sizeof(v), type);
 121 }
 122
 123 static stc_error_e send_nfacct_request(int sock, struct genl *req)
 124 {
 125         struct sockaddr_nl nladdr = {.nl_family = AF_NETLINK};
 126         int ret = sendto(sock, (char *)(&req->n), req->n.nlmsg_len, 0,
 127                          (struct sockaddr *)&nladdr, sizeof(nladdr));
 128         ret_value_msg_if(ret < 0, STC_ERROR_FAIL,
 129                          "Failed to send command to get outgoing traffic");
 130
 131         return STC_ERROR_NONE;
 132 }
 133
 134 static stc_error_e nfacct_send_new(nfacct_rule_s *counter)
 135 {
 136         struct genl req;
 137
 138         prepare_netlink_msg(&req, NFNL_MSG_ACCT_NEW, NLM_F_CREATE | NLM_F_ACK);
 139         add_string_attr(&req, counter->name, NFACCT_NAME);
 140
 141         STC_LOGD("counter name %s", counter->name);
 142
 143         /* padding */
 144         add_uint64_attr(&req, 0, NFACCT_PKTS);
 145         add_uint64_attr(&req, 0, NFACCT_BYTES);
 146         if (counter->quota) {
 147                 STC_LOGD("quota bytes %"PRId64, counter->quota);
 148
 149                 add_uint32_attr(&req, htobe32(NFACCT_F_QUOTA_BYTES),
 150                                 NFACCT_FLAGS);
 151                 add_uint64_attr(&req, htobe64(counter->quota), NFACCT_QUOTA);
 152         }
 153
 154         return send_nfacct_request(counter->carg->sock, &req);
 155 }
 156
 157 stc_error_e nfacct_send_del(nfacct_rule_s *counter)
 158 {
 159         struct genl req;
 160
 161         STC_LOGD("send remove request for %s", counter->name);
 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         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 392
 393         if (!pid) {
 394                 STC_LOGD("no need to wait");
 395                 return;
 396         }
 397         ret_pid = waitpid(pid, &status, 0);
 398         if (ret_pid < 0)
 399                 STC_LOGD("can't wait for a pid %d %d %s", pid, status,
 400                          strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 401 }
 402
 403 static char* get_cmd_pos(const char *cmd_buf)
 404 {
 405         char *cmd_pos = strstr(cmd_buf, APPEND);
 406         if (!cmd_pos)
 407                 cmd_pos = strstr(cmd_buf, INSERT);
 408
 409         return cmd_pos;
 410 }
 411
 412 static bool is_rule_exists(const char *cmd_buf)
 413 {
 414         size_t buf_len;
 415         char *exec_buf;
 416         char *cmd_pos = get_cmd_pos(cmd_buf);
 417         bool ret = false;
 418         if (!cmd_pos)
 419                 return false;
 420
 421         buf_len = strlen(cmd_buf) + 1;
 422         exec_buf = (char *)malloc(buf_len);
 423         if (!exec_buf)
 424                 return false;
 425
 426         strncpy(exec_buf, cmd_buf, buf_len);
 427         strncpy(exec_buf + (cmd_pos - cmd_buf), IPTABLES_CHECK,
 428                 sizeof(IPTABLES_CHECK) - 1);
 429
 430         STC_LOGD("check rule %s", exec_buf);
 431
 432         ret = system(exec_buf) == 0;
 433         free(exec_buf);
 434         return ret;
 435 }
 436
 437 stc_error_e exec_iptables_cmd(const char *cmd_buf, pid_t *cmd_pid)
 438 {
 439         pid_t pid = fork();
 440
 441         if (pid == 0) {
 442                 char *cmd;
 443                 unsigned int i;
 444                 const size_t args_number = get_args_number(cmd_buf);
 445                 char *args[args_number + 2];
 446                 int ret;
 447                 char *save_ptr = NULL;
 448                 char buf[BUF_SIZE_FOR_ERR] = { 0 };
 449
 450                 STC_LOGD("executing iptables cmd %s in forked process",
 451                          cmd_buf);
 452
 453                 ret_value_msg_if(args_number == 0, STC_ERROR_FAIL, "no arguments");
 454
 455                 if (is_rule_exists(cmd_buf)) {
 456                         STC_LOGD("Rule %s already exists", cmd_buf);
 457                         exit(0);
 458                 }
 459                 args[0] = "iptables";
 460                 cmd = strtok_r((char *)cmd_buf, " ", &save_ptr);
 461                 ret_value_msg_if(cmd == NULL, STC_ERROR_FAIL, "no arguments");
 462                 for (i = 1; i <= args_number; ++i)
 463                         args[i] = strtok_r(NULL, " ", &save_ptr);
 464
 465                 args[i] = NULL;
 466
 467                 ret = execv(cmd, args);
 468                 if (ret)
 469                         STC_LOGE("Can't execute %s: %s",
 470                                  cmd_buf, strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 471                 exit(ret);
 472         }
 473
 474         *cmd_pid = pid;
 475         return STC_ERROR_NONE;
 476 }
 477
 478 stc_error_e exec_ip6tables_cmd(const char *cmd_buf, pid_t *cmd_pid)
 479 {
 480         pid_t pid = fork();
 481
 482         if (pid == 0) {
 483                 char *cmd;
 484                 unsigned int i;
 485                 const size_t args_number = get_args_number(cmd_buf);
 486                 char *args[args_number + 2];
 487                 int ret;
 488                 char *save_ptr = NULL;
 489                 char buf[BUF_SIZE_FOR_ERR] = { 0 };
 490
 491                 STC_LOGD("executing ip6tables cmd %s in forked process",
 492                          cmd_buf);
 493
 494                 ret_value_msg_if(args_number == 0, STC_ERROR_FAIL, "no arguments");
 495
 496                 if (is_rule_exists(cmd_buf)) {
 497                         STC_LOGD("Rule %s already exists", cmd_buf);
 498                         exit(0);
 499                 }
 500                 args[0] = "ip6tables";
 501                 cmd = strtok_r((char *)cmd_buf, " ", &save_ptr);
 502                 ret_value_msg_if(cmd == NULL, STC_ERROR_FAIL, "no arguments");
 503                 for (i = 1; i <= args_number; ++i)
 504                         args[i] = strtok_r(NULL, " ", &save_ptr);
 505
 506                 args[i] = NULL;
 507
 508                 ret = execv(cmd, args);
 509                 if (ret)
 510                         STC_LOGE("Can't execute %s: %s",
 511                                  cmd_buf, strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 512                 exit(ret);
 513         }
 514
 515         *cmd_pid = pid;
 516         return STC_ERROR_NONE;
 517 }
 518
 519 static char *choose_iftype_name(nfacct_rule_s *rule)
 520 {
 521         return strlen(rule->ifname) != 0 ? rule->ifname :
 522                 get_iftype_name(rule->iftype);
 523 }
 524
 525 static stc_error_e exec_iface_cmd(const char *pattern, const char *cmd,
 526                                   const char *chain, const char *nfacct,
 527                                   const char *jump, char *iftype_name,
 528                                   pid_t *pid)
 529 {
 530         char block_buf[MAX_PATH_LENGTH];
 531         int ret;
 532
 533         ret_value_msg_if(iftype_name == NULL, STC_ERROR_FAIL,
 534                          "Invalid network interface name argument");
 535
 536         /* iptables rule */
 537         ret = snprintf(block_buf, sizeof(block_buf), pattern, IPTABLES, cmd, chain,
 538                       iftype_name, nfacct, jump);
 539         ret_value_msg_if(ret > sizeof(block_buf), STC_ERROR_FAIL,
 540                          "Not enough buffer");
 541         exec_iptables_cmd(block_buf, pid);
 542
 543         /* ip6tables rule */
 544         ret = snprintf(block_buf, sizeof(block_buf), pattern, IP6TABLES, cmd, chain,
 545                       iftype_name, nfacct, jump);
 546         ret_value_msg_if(ret > sizeof(block_buf), STC_ERROR_FAIL,
 547                          "Not enough buffer");
 548         return exec_ip6tables_cmd(block_buf, pid);
 549 }
 550
 551 static stc_error_e exec_app_cmd(const char *pattern, const char *cmd,
 552                                 const char *nfacct, const char *jump,
 553                                 const uint32_t classid, char *iftype_name,
 554                                 pid_t *pid)
 555 {
 556         char block_buf[MAX_PATH_LENGTH];
 557         int ret;
 558         ret_value_msg_if(iftype_name == NULL, STC_ERROR_FAIL,
 559                          "Invalid network interface name argument");
 560
 561         /* iptables rules */
 562         ret = snprintf(block_buf, sizeof(block_buf), pattern, IPTABLES, cmd,
 563                       iftype_name, classid, nfacct, jump);
 564         ret_value_msg_if(ret > sizeof(block_buf), STC_ERROR_FAIL,
 565                          "Not enough buffer");
 566         exec_iptables_cmd(block_buf, pid);
 567
 568         /* ip6tables rules */
 569         ret = snprintf(block_buf, sizeof(block_buf), pattern, IP6TABLES, cmd,
 570                       iftype_name, classid, nfacct, jump);
 571         ret_value_msg_if(ret > sizeof(block_buf), STC_ERROR_FAIL,
 572                          "Not enough buffer");
 573         return exec_ip6tables_cmd(block_buf, pid);
 574 }
 575
 576 static char *get_iptables_cmd(const nfacct_rule_action action)
 577 {
 578         if (action == NFACCT_ACTION_APPEND)
 579                 return APPEND;
 580         else if (action == NFACCT_ACTION_DELETE)
 581                 return DELETE;
 582         else if (action == NFACCT_ACTION_INSERT)
 583                 return INSERT;
 584
 585         return "";
 586 }
 587
 588 static char *get_iptables_chain(const nfacct_rule_direction iotype)
 589 {
 590         if (iotype == NFACCT_COUNTER_IN)
 591                 return IN_RULE;
 592         else if (iotype == NFACCT_COUNTER_OUT)
 593                 return OUT_RULE;
 594
 595         return "";
 596 }
 597
 598 static char *get_iptables_jump(const nfacct_rule_jump jump)
 599 {
 600         if (jump == NFACCT_JUMP_ACCEPT)
 601                 return ACCEPT_RULE;
 602         else if (jump == NFACCT_JUMP_REJECT)
 603                 return REJECT_RULE;
 604
 605         return "";
 606 }
 607
 608 static stc_error_e produce_app_rule(nfacct_rule_s *rule,
 609                                     const int64_t send_limit,
 610                                     const int64_t rcv_limit,
 611                                     const nfacct_rule_action action,
 612                                     const nfacct_rule_jump jump,
 613                                     const nfacct_rule_direction iotype)
 614 {
 615         char *set_cmd = get_iptables_cmd(action);
 616         char *jump_cmd = get_iptables_jump(jump);
 617         char nfacct_buf[sizeof(NFACCT_NAME_MOD) +
 618                 3*MAX_DEC_SIZE(int) + 4];
 619         stc_error_e ret = STC_ERROR_NONE;
 620         pid_t pid = 0;
 621
 622         /* income part */
 623         if (iotype & NFACCT_COUNTER_IN) {
 624                 rule->quota = rcv_limit;
 625                 rule->iotype = NFACCT_COUNTER_IN;
 626                 generate_counter_name(rule);
 627
 628                 /* to support quated counter we need nfacct,
 629                  *      don't use it in case of just block without a limit
 630                  *      iow, send_limit = 0 and rcv_limit 0 */
 631                 if (action != NFACCT_ACTION_DELETE) {
 632                         ret = nfacct_send_del(rule);
 633                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 634                                          "can't del quota counter");
 635
 636                         ret = nfacct_send_new(rule);
 637                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 638                                          "can't set nfacct counter");
 639                         keep_counter(rule);
 640                 }
 641
 642                 /* we have a counter, let's key in a rule, drop in case of
 643                  *  send_limit/rcv_limit */
 644                 ret = snprintf(nfacct_buf, sizeof(nfacct_buf), NFACCT_NAME_MOD,
 645                                rule->name);
 646                 ret_value_msg_if(ret > sizeof(nfacct_buf) || ret < 0,
 647                                  STC_ERROR_FAIL, "Not enought buffer");
 648
 649                 ret = exec_app_cmd(RULE_APP_IN, set_cmd, nfacct_buf, jump_cmd,
 650                                    rule->classid, choose_iftype_name(rule),
 651                                    &pid);
 652                 ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 653                                  "Can't set conditional block for ingress"
 654                                  " traffic, for classid %u, cmd %s, j %s",
 655                                  rule->classid, set_cmd, jump_cmd);
 656
 657                 /* remove in any case */
 658                 if (action == NFACCT_ACTION_DELETE) {
 659                         /* TODO here and everywhere should be not just a del,
 660                          *      here should be get counted value and than
 661                          *      set new counter with that value, but it's minor issue,
 662                          *      due it's not clear when actual counters was stored,
 663                          *      and based on which value settings made such decition */
 664                         wait_for_rule_cmd(pid);
 665                         rule->iptables_rule = nfacct_send_del;
 666                         set_finalize_flag(rule);
 667                         nfacct_send_get(rule);
 668                         ret = nfacct_send_del(rule);
 669                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 670                                          "can't del quota counter");
 671                 }
 672         }
 673
 674         if (iotype & NFACCT_COUNTER_OUT) {
 675                 /* outcome part */
 676                 rule->iotype = NFACCT_COUNTER_OUT;
 677                 rule->quota = send_limit;
 678                 generate_counter_name(rule);
 679                 if (action != NFACCT_ACTION_DELETE) {
 680                         ret = nfacct_send_del(rule);
 681                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 682                                          "can't del quota counter");
 683
 684                         ret = nfacct_send_new(rule);
 685                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 686                                          "can't set quota counter");
 687                         keep_counter(rule);
 688                 }
 689
 690                 ret = snprintf(nfacct_buf, sizeof(nfacct_buf), NFACCT_NAME_MOD,
 691                                rule->name);
 692                 ret_value_msg_if(ret > sizeof(nfacct_buf) || ret < 0,
 693                                  STC_ERROR_FAIL, "Not enought buffer");
 694
 695                 ret = exec_app_cmd(RULE_APP_OUT, set_cmd, nfacct_buf, jump_cmd,
 696                                    rule->classid, choose_iftype_name(rule),
 697                                    &pid);
 698                 ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 699                                  "Can't set conditional block for engress"
 700                                  " traffic, for classid %u, cmd %s, j %s",
 701                                  rule->classid, set_cmd, jump_cmd);
 702                 if (action == NFACCT_ACTION_DELETE) {
 703                         wait_for_rule_cmd(pid);
 704                         rule->iptables_rule = nfacct_send_del;
 705                         /* not effective, it's better to replace
 706                          * set_finalize_flag by set_property,
 707                          * due keep_counter it necessary only for
 708                          * setting iptables_rule */
 709                         set_finalize_flag(rule);
 710                         nfacct_send_get(rule);
 711                         ret = nfacct_send_del(rule);
 712                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 713                                          "can't del quota counter");
 714                 }
 715         }
 716         return STC_ERROR_NONE;
 717 }
 718
 719 static stc_error_e produce_iface_rule(nfacct_rule_s *rule,
 720                                       const int64_t send_limit,
 721                                       const int64_t rcv_limit,
 722                                       const nfacct_rule_action action,
 723                                       const nfacct_rule_jump jump,
 724                                       const nfacct_rule_direction iotype)
 725 {
 726         char *set_cmd = get_iptables_cmd(action);
 727         char *jump_cmd = get_iptables_jump(jump);
 728         char nfacct_buf[sizeof(NFACCT_NAME_MOD) +
 729                 3*MAX_DEC_SIZE(int) + 4];
 730         stc_error_e ret;
 731         pid_t pid = 0;
 732
 733         if (iotype & NFACCT_COUNTER_IN) {
 734                 /* income part */
 735                 rule->iotype = NFACCT_COUNTER_IN;
 736                 rule->quota = rcv_limit;
 737                 generate_counter_name(rule);
 738
 739                 if (action != NFACCT_ACTION_DELETE) {
 740                         /* send delete comman in case of creation,
 741                          * because nfacct doesn't reset value for nfacct quota
 742                          * in case of quota existing */
 743                         ret = nfacct_send_del(rule);
 744                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 745                                          "can't del quota counter");
 746
 747                         ret = nfacct_send_new(rule);
 748                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 749                                          "can't set quota counter");
 750                         keep_counter(rule);
 751                 }
 752
 753                 ret = snprintf(nfacct_buf, sizeof(nfacct_buf),
 754                                NFACCT_NAME_MOD, rule->name);
 755                 ret_value_msg_if(ret > sizeof(nfacct_buf) || ret < 0,
 756                                  STC_ERROR_FAIL, "Not enought buffer");
 757
 758                 ret = exec_iface_cmd(RULE_IFACE_IN, set_cmd,
 759                                      get_iptables_chain(rule->iotype),
 760                                      nfacct_buf, jump_cmd,
 761                                      choose_iftype_name(rule), &pid);
 762                 ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 763                                  "Can't set conditional block for ingress"
 764                                  " traffic, for iftype %d, cmd %s, j %s",
 765                                  rule->iftype, set_cmd, jump_cmd);
 766
 767                 /* for tethering */
 768                 if (rule->intend == NFACCT_WARN ||
 769                     rule->intend == NFACCT_BLOCK) {
 770                         /* RULE_IFACE_OUT is not a misprint here */
 771                         wait_for_rule_cmd(pid);
 772                         ret = exec_iface_cmd(RULE_IFACE_IN, set_cmd,
 773                                              FORWARD_RULE, nfacct_buf, jump_cmd,
 774                                              choose_iftype_name(rule), &pid);
 775                         ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 776                                          "Can't set forward rule for ingress "
 777                                          "traffic, for iftype %d, cmd %s, j %s",
 778                                          rule->iftype, set_cmd, jump_cmd);
 779                 }
 780                 /* tethering */
 781
 782                 if (action == NFACCT_ACTION_DELETE) {
 783                         wait_for_rule_cmd(pid);
 784                         rule->iptables_rule = nfacct_send_del;
 785                         set_finalize_flag(rule);
 786                         nfacct_send_get(rule);
 787                         ret = nfacct_send_del(rule);
 788                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 789                                          "can't del quota counter");
 790                 }
 791         }
 792
 793         if (iotype & NFACCT_COUNTER_OUT) {
 794                 /* outcome part */
 795                 rule->iotype = NFACCT_COUNTER_OUT;
 796                 rule->quota = send_limit;
 797                 generate_counter_name(rule);
 798
 799                 if (action != NFACCT_ACTION_DELETE) {
 800                         /* send delete comman in case of creation,
 801                          * because nfacct doesn't reset value for nfacct quota
 802                          * in case of quota existing */
 803                         ret = nfacct_send_del(rule);
 804                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 805                                          "can't del quota counter");
 806
 807                         ret = nfacct_send_new(rule);
 808                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 809                                          "can't set quota counter");
 810                         keep_counter(rule);
 811                 }
 812
 813                 ret = snprintf(nfacct_buf, sizeof(nfacct_buf),
 814                                NFACCT_NAME_MOD, rule->name);
 815                 ret_value_msg_if(ret > sizeof(nfacct_buf) || ret < 0,
 816                                  STC_ERROR_FAIL, "Not enough buffer");
 817
 818                 wait_for_rule_cmd(pid);
 819                 ret = exec_iface_cmd(RULE_IFACE_OUT, set_cmd, OUT_RULE,
 820                                      nfacct_buf, jump_cmd,
 821                                      choose_iftype_name(rule), &pid);
 822                 ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 823                                  "Can't set conditional block for "
 824                                  "engress traffic, for iftype %d, cmd %s, j %s",
 825                                  rule->iftype, set_cmd, jump_cmd);
 826                 /* for tethering  */
 827                 if (rule->intend == NFACCT_WARN ||
 828                     rule->intend == NFACCT_BLOCK) {
 829                         wait_for_rule_cmd(pid);
 830                         ret = exec_iface_cmd(RULE_IFACE_OUT, set_cmd,
 831                                              FORWARD_RULE, nfacct_buf, jump_cmd,
 832                                              choose_iftype_name(rule), &pid);
 833                         ret_value_msg_if(ret != STC_ERROR_NONE, STC_ERROR_FAIL,
 834                                          "Can't set forward rule for engress "
 835                                          "traffic, for iftype %d, cmd %s, j %s",
 836                                          rule->iftype, set_cmd, jump_cmd);
 837                 }
 838                 /* tethering  */
 839
 840                 if (action == NFACCT_ACTION_DELETE) {
 841                         wait_for_rule_cmd(pid);
 842                         rule->iptables_rule = nfacct_send_del;
 843                         set_finalize_flag(rule);
 844                         nfacct_send_get(rule);
 845                         ret = nfacct_send_del(rule);
 846                         ret_value_msg_if(ret != STC_ERROR_NONE, ret,
 847                                          "can't del quota counter");
 848                 }
 849         }
 850         return STC_ERROR_NONE;
 851 }
 852
 853 stc_error_e produce_net_rule(nfacct_rule_s *rule,
 854                              const int64_t send_limit,
 855                              const int64_t rcv_limit,
 856                              const nfacct_rule_action action,
 857                              const nfacct_rule_jump jump,
 858                              const nfacct_rule_direction iotype)
 859 {
 860         stc_error_e ret = STC_ERROR_NONE;
 861
 862         if (action == NFACCT_ACTION_APPEND && rule->intend == NFACCT_WARN
 863             && !send_limit && !rcv_limit)
 864                 return STC_ERROR_NONE;
 865
 866         if (rule->classid != STC_ALL_APP_CLASSID &&
 867             rule->classid != STC_TETHERING_APP_CLASSID)
 868                 ret = produce_app_rule(rule, send_limit,
 869                                        rcv_limit, action, jump, iotype);
 870         else
 871                 ret = produce_iface_rule(rule, send_limit, rcv_limit,
 872                                          action, jump, iotype);
 873
 874         return ret;
 875 }
 876
 877 void generate_counter_name(nfacct_rule_s *counter)
 878 {
 879         char warn_symbol = 'c';
 880         if (!strlen(counter->ifname)) {
 881                 char *iftype_name = get_iftype_name(counter->iftype);
 882                 /* trace counter name, maybe name was already generated */
 883                 ret_msg_if(iftype_name == NULL,
 884                            "Can't get interface name for counter %s, iftype %d)!",
 885                            counter->name, counter->iftype);
 886                 STRING_SAVE_COPY(counter->ifname, iftype_name);
 887         }
 888
 889         if (counter->intend  == NFACCT_WARN)
 890                 warn_symbol = 'w';
 891         else if (counter->intend  == NFACCT_BLOCK)
 892                 warn_symbol = 'r';
 893         snprintf(counter->name, NFACCT_NAME_MAX, "%c%d_%d_%d_%s",
 894                  warn_symbol, counter->iotype, counter->iftype,
 895                  counter->classid, counter->ifname);
 896 }
 897