zebra/zebra_ptm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Kernel routing table updates using netlink over GNU/Linux system.
   3  * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
   4  */
   5
   6 #include <zebra.h>
   7
   8 #include <sys/un.h> /* for sockaddr_un */
   9 #include <net/if.h>
  10
  11 #include "bfd.h"
  12 #include "buffer.h"
  13 #include "command.h"
  14 #include "if.h"
  15 #include "network.h"
  16 #include "ptm_lib.h"
  17 #include "rib.h"
  18 #include "stream.h"
  19 #include "vrf.h"
  20 #include "vty.h"
  21 #include "lib_errors.h"
  22
  23 #include "zebra/debug.h"
  24 #include "zebra/interface.h"
  25 #include "zebra/zebra_errors.h"
  26 #include "zebra/zebra_ptm.h"
  27 #include "zebra/zebra_ptm_redistribute.h"
  28 #include "zebra/zebra_router.h"
  29 #include "zebra_vrf.h"
  30
  31 /*
  32  * Choose the BFD implementation that we'll use.
  33  *
  34  * There are two implementations:
  35  * - PTM BFD: which uses an external daemon;
  36  * - bfdd: FRR's own BFD daemon;
  37  */
  38 #if HAVE_BFDD == 0
  39
  40 #define ZEBRA_PTM_RECONNECT_TIME_INITIAL 1 /* initial reconnect is 1s */
  41 #define ZEBRA_PTM_RECONNECT_TIME_MAX     300
  42
  43 #define PTM_MSG_LEN     4
  44 #define PTM_HEADER_LEN  37
  45
  46 const char ZEBRA_PTM_GET_STATUS_CMD[] = "get-status";
  47 const char ZEBRA_PTM_BFD_START_CMD[] = "start-bfd-sess";
  48 const char ZEBRA_PTM_BFD_STOP_CMD[] = "stop-bfd-sess";
  49 const char ZEBRA_PTM_BFD_CLIENT_REG_CMD[] = "reg-bfd-client";
  50 const char ZEBRA_PTM_BFD_CLIENT_DEREG_CMD[] = "dereg-bfd-client";
  51
  52 const char ZEBRA_PTM_CMD_STR[] = "cmd";
  53 const char ZEBRA_PTM_CMD_STATUS_STR[] = "cmd_status";
  54 const char ZEBRA_PTM_PORT_STR[] = "port";
  55 const char ZEBRA_PTM_CBL_STR[] = "cbl status";
  56 const char ZEBRA_PTM_PASS_STR[] = "pass";
  57 const char ZEBRA_PTM_FAIL_STR[] = "fail";
  58 const char ZEBRA_PTM_BFDSTATUS_STR[] = "state";
  59 const char ZEBRA_PTM_BFDSTATUS_UP_STR[] = "Up";
  60 const char ZEBRA_PTM_BFDSTATUS_DOWN_STR[] = "Down";
  61 const char ZEBRA_PTM_BFDDEST_STR[] = "peer";
  62 const char ZEBRA_PTM_BFDSRC_STR[] = "local";
  63 const char ZEBRA_PTM_BFDVRF_STR[] = "vrf";
  64 const char ZEBRA_PTM_INVALID_PORT_NAME[] = "N/A";
  65 const char ZEBRA_PTM_INVALID_SRC_IP[] = "N/A";
  66 const char ZEBRA_PTM_INVALID_VRF[] = "N/A";
  67
  68 const char ZEBRA_PTM_BFD_DST_IP_FIELD[] = "dstIPaddr";
  69 const char ZEBRA_PTM_BFD_SRC_IP_FIELD[] = "srcIPaddr";
  70 const char ZEBRA_PTM_BFD_MIN_RX_FIELD[] = "requiredMinRx";
  71 const char ZEBRA_PTM_BFD_MIN_TX_FIELD[] = "upMinTx";
  72 const char ZEBRA_PTM_BFD_DETECT_MULT_FIELD[] = "detectMult";
  73 const char ZEBRA_PTM_BFD_MULTI_HOP_FIELD[] = "multiHop";
  74 const char ZEBRA_PTM_BFD_CLIENT_FIELD[] = "client";
  75 const char ZEBRA_PTM_BFD_SEQID_FIELD[] = "seqid";
  76 const char ZEBRA_PTM_BFD_IFNAME_FIELD[] = "ifName";
  77 const char ZEBRA_PTM_BFD_MAX_HOP_CNT_FIELD[] = "maxHopCnt";
  78 const char ZEBRA_PTM_BFD_SEND_EVENT[] = "sendEvent";
  79 const char ZEBRA_PTM_BFD_VRF_NAME_FIELD[] = "vrfName";
  80 const char ZEBRA_PTM_BFD_CBIT_FIELD[] = "bfdcbit";
  81
  82 static ptm_lib_handle_t *ptm_hdl;
  83
  84 struct zebra_ptm_cb ptm_cb;
  85
  86 static int zebra_ptm_socket_init(void);
  87 void zebra_ptm_sock_read(struct thread *thread);
  88 static void zebra_ptm_install_commands(void);
  89 static int zebra_ptm_handle_msg_cb(void *arg, void *in_ctxt);
  90 void zebra_bfd_peer_replay_req(void);
  91 void zebra_ptm_send_status_req(void);
  92 void zebra_ptm_reset_status(int ptm_disable);
  93 static int zebra_ptm_bfd_client_deregister(struct zserv *client);
  94
  95 const char ZEBRA_PTM_SOCK_NAME[] = "\0/var/run/ptmd.socket";
  96
  97 void zebra_ptm_init(void)
  98 {
  99         char buf[64];
 100
 101         memset(&ptm_cb, 0, sizeof(ptm_cb));
 102
 103         ptm_cb.out_data = calloc(1, ZEBRA_PTM_SEND_MAX_SOCKBUF);
 104         if (!ptm_cb.out_data) {
 105                 zlog_debug("%s: Allocation of send data failed", __func__);
 106                 return;
 107         }
 108
 109         ptm_cb.in_data = calloc(1, ZEBRA_PTM_MAX_SOCKBUF);
 110         if (!ptm_cb.in_data) {
 111                 zlog_debug("%s: Allocation of recv data failed", __func__);
 112                 free(ptm_cb.out_data);
 113                 return;
 114         }
 115
 116         ptm_cb.pid = getpid();
 117         zebra_ptm_install_commands();
 118
 119         snprintf(buf, sizeof(buf), "%s", FRR_PTM_NAME);
 120         ptm_hdl = ptm_lib_register(buf, NULL, zebra_ptm_handle_msg_cb,
 121                                    zebra_ptm_handle_msg_cb);
 122         ptm_cb.wb = buffer_new(0);
 123
 124         ptm_cb.reconnect_time = ZEBRA_PTM_RECONNECT_TIME_INITIAL;
 125
 126         ptm_cb.ptm_sock = -1;
 127
 128         hook_register(zserv_client_close, zebra_ptm_bfd_client_deregister);
 129 }
 130
 131 void zebra_ptm_finish(void)
 132 {
 133         buffer_flush_all(ptm_cb.wb, ptm_cb.ptm_sock);
 134
 135         free(ptm_hdl);
 136
 137         if (ptm_cb.out_data)
 138                 free(ptm_cb.out_data);
 139
 140         if (ptm_cb.in_data)
 141                 free(ptm_cb.in_data);
 142
 143         /* Cancel events. */
 144         THREAD_OFF(ptm_cb.t_read);
 145         THREAD_OFF(ptm_cb.t_write);
 146         THREAD_OFF(ptm_cb.t_timer);
 147
 148         if (ptm_cb.wb)
 149                 buffer_free(ptm_cb.wb);
 150
 151         if (ptm_cb.ptm_sock >= 0)
 152                 close(ptm_cb.ptm_sock);
 153 }
 154
 155 static void zebra_ptm_flush_messages(struct thread *thread)
 156 {
 157         ptm_cb.t_write = NULL;
 158
 159         if (ptm_cb.ptm_sock == -1)
 160                 return;
 161
 162         errno = 0;
 163
 164         switch (buffer_flush_available(ptm_cb.wb, ptm_cb.ptm_sock)) {
 165         case BUFFER_ERROR:
 166                 flog_err_sys(EC_LIB_SOCKET, "%s ptm socket error: %s", __func__,
 167                              safe_strerror(errno));
 168                 close(ptm_cb.ptm_sock);
 169                 ptm_cb.ptm_sock = -1;
 170                 zebra_ptm_reset_status(0);
 171                 ptm_cb.t_timer = NULL;
 172                 thread_add_timer(zrouter.master, zebra_ptm_connect, NULL,
 173                                  ptm_cb.reconnect_time, &ptm_cb.t_timer);
 174                 return;
 175         case BUFFER_PENDING:
 176                 ptm_cb.t_write = NULL;
 177                 thread_add_write(zrouter.master, zebra_ptm_flush_messages, NULL,
 178                                  ptm_cb.ptm_sock, &ptm_cb.t_write);
 179                 break;
 180         case BUFFER_EMPTY:
 181                 break;
 182         }
 183 }
 184
 185 static int zebra_ptm_send_message(char *data, int size)
 186 {
 187         errno = 0;
 188         switch (buffer_write(ptm_cb.wb, ptm_cb.ptm_sock, data, size)) {
 189         case BUFFER_ERROR:
 190                 flog_err_sys(EC_LIB_SOCKET, "%s ptm socket error: %s", __func__,
 191                              safe_strerror(errno));
 192                 close(ptm_cb.ptm_sock);
 193                 ptm_cb.ptm_sock = -1;
 194                 zebra_ptm_reset_status(0);
 195                 ptm_cb.t_timer = NULL;
 196                 thread_add_timer(zrouter.master, zebra_ptm_connect, NULL,
 197                                  ptm_cb.reconnect_time, &ptm_cb.t_timer);
 198                 return -1;
 199         case BUFFER_EMPTY:
 200                 THREAD_OFF(ptm_cb.t_write);
 201                 break;
 202         case BUFFER_PENDING:
 203                 thread_add_write(zrouter.master, zebra_ptm_flush_messages, NULL,
 204                                  ptm_cb.ptm_sock, &ptm_cb.t_write);
 205                 break;
 206         }
 207
 208         return 0;
 209 }
 210
 211 void zebra_ptm_connect(struct thread *t)
 212 {
 213         int init = 0;
 214
 215         if (ptm_cb.ptm_sock == -1) {
 216                 zebra_ptm_socket_init();
 217                 init = 1;
 218         }
 219
 220         if (ptm_cb.ptm_sock != -1) {
 221                 if (init) {
 222                         ptm_cb.t_read = NULL;
 223                         thread_add_read(zrouter.master, zebra_ptm_sock_read,
 224                                         NULL, ptm_cb.ptm_sock, &ptm_cb.t_read);
 225                         zebra_bfd_peer_replay_req();
 226                 }
 227                 zebra_ptm_send_status_req();
 228                 ptm_cb.reconnect_time = ZEBRA_PTM_RECONNECT_TIME_INITIAL;
 229         } else if (ptm_cb.reconnect_time < ZEBRA_PTM_RECONNECT_TIME_MAX) {
 230                 ptm_cb.reconnect_time *= 2;
 231                 if (ptm_cb.reconnect_time > ZEBRA_PTM_RECONNECT_TIME_MAX)
 232                         ptm_cb.reconnect_time = ZEBRA_PTM_RECONNECT_TIME_MAX;
 233
 234                 ptm_cb.t_timer = NULL;
 235                 thread_add_timer(zrouter.master, zebra_ptm_connect, NULL,
 236                                  ptm_cb.reconnect_time, &ptm_cb.t_timer);
 237         } else if (ptm_cb.reconnect_time >= ZEBRA_PTM_RECONNECT_TIME_MAX) {
 238                 ptm_cb.reconnect_time = ZEBRA_PTM_RECONNECT_TIME_INITIAL;
 239         }
 240 }
 241
 242 DEFUN (zebra_ptm_enable,
 243        zebra_ptm_enable_cmd,
 244        "ptm-enable",
 245        "Enable neighbor check with specified topology\n")
 246 {
 247         struct vrf *vrf;
 248         struct interface *ifp;
 249         struct zebra_if *if_data;
 250
 251         ptm_cb.ptm_enable = ZEBRA_IF_PTM_ENABLE_ON;
 252
 253         RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name)
 254                 FOR_ALL_INTERFACES (vrf, ifp)
 255                         if (!ifp->ptm_enable) {
 256                                 if_data = (struct zebra_if *)ifp->info;
 257                                 if (if_data
 258                                     && (if_data->ptm_enable
 259                                         == ZEBRA_IF_PTM_ENABLE_UNSPEC)) {
 260                                         ifp->ptm_enable =
 261                                                 ZEBRA_IF_PTM_ENABLE_ON;
 262                                 }
 263                                 /* Assign a default unknown status */
 264                                 ifp->ptm_status = ZEBRA_PTM_STATUS_UNKNOWN;
 265                         }
 266
 267         zebra_ptm_connect(NULL);
 268
 269         return CMD_SUCCESS;
 270 }
 271
 272 DEFUN (no_zebra_ptm_enable,
 273        no_zebra_ptm_enable_cmd,
 274        "no ptm-enable",
 275        NO_STR
 276        "Enable neighbor check with specified topology\n")
 277 {
 278         ptm_cb.ptm_enable = ZEBRA_IF_PTM_ENABLE_OFF;
 279         zebra_ptm_reset_status(1);
 280         return CMD_SUCCESS;
 281 }
 282
 283 DEFUN (zebra_ptm_enable_if,
 284        zebra_ptm_enable_if_cmd,
 285        "ptm-enable",
 286        "Enable neighbor check with specified topology\n")
 287 {
 288         VTY_DECLVAR_CONTEXT(interface, ifp);
 289         struct zebra_if *if_data;
 290         int old_ptm_enable;
 291         int send_linkdown = 0;
 292
 293         if_data = ifp->info;
 294         if_data->ptm_enable = ZEBRA_IF_PTM_ENABLE_UNSPEC;
 295
 296         if (ifp->ifindex == IFINDEX_INTERNAL) {
 297                 return CMD_SUCCESS;
 298         }
 299
 300         old_ptm_enable = ifp->ptm_enable;
 301         ifp->ptm_enable = ptm_cb.ptm_enable;
 302
 303         if (if_is_no_ptm_operative(ifp))
 304                 send_linkdown = 1;
 305
 306         if (!old_ptm_enable && ptm_cb.ptm_enable) {
 307                 if (!if_is_operative(ifp) && send_linkdown) {
 308                         if (IS_ZEBRA_DEBUG_EVENT)
 309                                 zlog_debug("%s: Bringing down interface %s",
 310                                            __func__, ifp->name);
 311                         if_down(ifp);
 312                 }
 313         }
 314
 315         return CMD_SUCCESS;
 316 }
 317
 318 DEFUN (no_zebra_ptm_enable_if,
 319        no_zebra_ptm_enable_if_cmd,
 320        "no ptm-enable",
 321        NO_STR
 322        "Enable neighbor check with specified topology\n")
 323 {
 324         VTY_DECLVAR_CONTEXT(interface, ifp);
 325         int send_linkup = 0;
 326         struct zebra_if *if_data;
 327
 328         if ((ifp->ifindex != IFINDEX_INTERNAL) && (ifp->ptm_enable)) {
 329                 if (!if_is_operative(ifp))
 330                         send_linkup = 1;
 331
 332                 ifp->ptm_enable = ZEBRA_IF_PTM_ENABLE_OFF;
 333                 if (if_is_no_ptm_operative(ifp) && send_linkup) {
 334                         if (IS_ZEBRA_DEBUG_EVENT)
 335                                 zlog_debug("%s: Bringing up interface %s",
 336                                            __func__, ifp->name);
 337                         if_up(ifp, true);
 338                 }
 339         }
 340
 341         if_data = ifp->info;
 342         if_data->ptm_enable = ZEBRA_IF_PTM_ENABLE_OFF;
 343
 344         return CMD_SUCCESS;
 345 }
 346
 347
 348 void zebra_ptm_write(struct vty *vty)
 349 {
 350         if (ptm_cb.ptm_enable)
 351                 vty_out(vty, "ptm-enable\n");
 352
 353         return;
 354 }
 355
 356 static int zebra_ptm_socket_init(void)
 357 {
 358         int ret;
 359         int sock;
 360         struct sockaddr_un addr;
 361
 362         ptm_cb.ptm_sock = -1;
 363
 364         sock = socket(PF_UNIX, SOCK_STREAM, 0);
 365         if (sock < 0)
 366                 return -1;
 367         if (set_nonblocking(sock) < 0) {
 368                 if (IS_ZEBRA_DEBUG_EVENT)
 369                         zlog_debug("%s: Unable to set socket non blocking[%s]",
 370                                    __func__, safe_strerror(errno));
 371                 close(sock);
 372                 return -1;
 373         }
 374
 375         /* Make server socket. */
 376         memset(&addr, 0, sizeof(addr));
 377         addr.sun_family = AF_UNIX;
 378         memcpy(&addr.sun_path, ZEBRA_PTM_SOCK_NAME,
 379                sizeof(ZEBRA_PTM_SOCK_NAME));
 380
 381         ret = connect(sock, (struct sockaddr *)&addr,
 382                       sizeof(addr.sun_family) + sizeof(ZEBRA_PTM_SOCK_NAME)
 383                               - 1);
 384         if (ret < 0) {
 385                 if (IS_ZEBRA_DEBUG_EVENT)
 386                         zlog_debug("%s: Unable to connect to socket %s [%s]",
 387                                    __func__, ZEBRA_PTM_SOCK_NAME,
 388                                    safe_strerror(errno));
 389                 close(sock);
 390                 return -1;
 391         }
 392         ptm_cb.ptm_sock = sock;
 393         return sock;
 394 }
 395
 396 static void zebra_ptm_install_commands(void)
 397 {
 398         install_element(CONFIG_NODE, &zebra_ptm_enable_cmd);
 399         install_element(CONFIG_NODE, &no_zebra_ptm_enable_cmd);
 400         install_element(INTERFACE_NODE, &zebra_ptm_enable_if_cmd);
 401         install_element(INTERFACE_NODE, &no_zebra_ptm_enable_if_cmd);
 402 }
 403
 404 /* BFD session goes down, send message to the protocols. */
 405 static void if_bfd_session_update(struct interface *ifp, struct prefix *dp,
 406                                   struct prefix *sp, int status,
 407                                   vrf_id_t vrf_id)
 408 {
 409         if (IS_ZEBRA_DEBUG_EVENT) {
 410                 char buf[2][INET6_ADDRSTRLEN];
 411
 412                 if (ifp) {
 413                         zlog_debug(
 414                                 "MESSAGE: ZEBRA_INTERFACE_BFD_DEST_UPDATE %s/%d on %s %s event",
 415                                 inet_ntop(dp->family, &dp->u.prefix, buf[0],
 416                                           INET6_ADDRSTRLEN),
 417                                 dp->prefixlen, ifp->name,
 418                                 bfd_get_status_str(status));
 419                 } else {
 420                         struct vrf *vrf = vrf_lookup_by_id(vrf_id);
 421
 422                         zlog_debug(
 423                                 "MESSAGE: ZEBRA_INTERFACE_BFD_DEST_UPDATE %s/%d with src %s/%d and vrf %s(%u) %s event",
 424                                 inet_ntop(dp->family, &dp->u.prefix, buf[0],
 425                                           INET6_ADDRSTRLEN),
 426                                 dp->prefixlen,
 427                                 inet_ntop(sp->family, &sp->u.prefix, buf[1],
 428                                           INET6_ADDRSTRLEN),
 429                                 sp->prefixlen, VRF_LOGNAME(vrf), vrf_id,
 430                                 bfd_get_status_str(status));
 431                 }
 432         }
 433
 434         zebra_interface_bfd_update(ifp, dp, sp, status, vrf_id);
 435 }
 436
 437 static int zebra_ptm_handle_bfd_msg(void *arg, void *in_ctxt,
 438                                     struct interface *ifp)
 439 {
 440         char bfdst_str[32];
 441         char dest_str[64];
 442         char src_str[64];
 443         char vrf_str[64];
 444         struct prefix dest_prefix;
 445         struct prefix src_prefix;
 446         vrf_id_t vrf_id;
 447
 448         ptm_lib_find_key_in_msg(in_ctxt, ZEBRA_PTM_BFDSTATUS_STR, bfdst_str);
 449
 450         if (bfdst_str[0] == '\0') {
 451                 return -1;
 452         }
 453
 454         ptm_lib_find_key_in_msg(in_ctxt, ZEBRA_PTM_BFDDEST_STR, dest_str);
 455
 456         if (dest_str[0] == '\0') {
 457                 zlog_debug("%s: Key %s not found in PTM msg", __func__,
 458                            ZEBRA_PTM_BFDDEST_STR);
 459                 return -1;
 460         }
 461
 462         ptm_lib_find_key_in_msg(in_ctxt, ZEBRA_PTM_BFDSRC_STR, src_str);
 463
 464         if (src_str[0] == '\0') {
 465                 zlog_debug("%s: Key %s not found in PTM msg", __func__,
 466                            ZEBRA_PTM_BFDSRC_STR);
 467                 return -1;
 468         }
 469
 470         ptm_lib_find_key_in_msg(in_ctxt, ZEBRA_PTM_BFDVRF_STR, vrf_str);
 471
 472         if (vrf_str[0] == '\0') {
 473                 zlog_debug("%s: Key %s not found in PTM msg", __func__,
 474                            ZEBRA_PTM_BFDVRF_STR);
 475                 return -1;
 476         }
 477
 478         if (IS_ZEBRA_DEBUG_EVENT)
 479                 zlog_debug(
 480                         "%s: Recv Port [%s] bfd status [%s] vrf [%s] peer [%s] local [%s]",
 481                         __func__, ifp ? ifp->name : "N/A", bfdst_str, vrf_str,
 482                         dest_str, src_str);
 483
 484         if (str2prefix(dest_str, &dest_prefix) == 0) {
 485                 flog_err(EC_ZEBRA_PREFIX_PARSE_ERROR,
 486                          "%s: Peer addr %s not found", __func__, dest_str);
 487                 return -1;
 488         }
 489
 490         memset(&src_prefix, 0, sizeof(src_prefix));
 491         if (strcmp(ZEBRA_PTM_INVALID_SRC_IP, src_str)) {
 492                 if (str2prefix(src_str, &src_prefix) == 0) {
 493                         flog_err(EC_ZEBRA_PREFIX_PARSE_ERROR,
 494                                  "%s: Local addr %s not found", __func__,
 495                                  src_str);
 496                         return -1;
 497                 }
 498         }
 499
 500         if (!strcmp(ZEBRA_PTM_INVALID_VRF, vrf_str) && ifp) {
 501                 vrf_id = ifp->vrf->vrf_id;
 502         } else {
 503                 struct vrf *pVrf;
 504
 505                 pVrf = vrf_lookup_by_name(vrf_str);
 506                 if (pVrf)
 507                         vrf_id = pVrf->vrf_id;
 508                 else
 509                         vrf_id = VRF_DEFAULT;
 510         }
 511
 512         if (!strcmp(bfdst_str, ZEBRA_PTM_BFDSTATUS_DOWN_STR)) {
 513                 if_bfd_session_update(ifp, &dest_prefix, &src_prefix,
 514                                       BFD_STATUS_DOWN, vrf_id);
 515         } else {
 516                 if_bfd_session_update(ifp, &dest_prefix, &src_prefix,
 517                                       BFD_STATUS_UP, vrf_id);
 518         }
 519
 520         return 0;
 521 }
 522
 523 static int zebra_ptm_handle_cbl_msg(void *arg, void *in_ctxt,
 524                                     struct interface *ifp, char *cbl_str)
 525 {
 526         int send_linkup = 0;
 527
 528         if (IS_ZEBRA_DEBUG_EVENT)
 529                 zlog_debug("%s: Recv Port [%s] cbl status [%s]", __func__,
 530                            ifp->name, cbl_str);
 531
 532         if (!strcmp(cbl_str, ZEBRA_PTM_PASS_STR)
 533             && (ifp->ptm_status != ZEBRA_PTM_STATUS_UP)) {
 534
 535                 if (ifp->ptm_status == ZEBRA_PTM_STATUS_DOWN)
 536                         send_linkup = 1;
 537                 ifp->ptm_status = ZEBRA_PTM_STATUS_UP;
 538                 if (ifp->ptm_enable && if_is_no_ptm_operative(ifp)
 539                     && send_linkup)
 540                         if_up(ifp, true);
 541         } else if (!strcmp(cbl_str, ZEBRA_PTM_FAIL_STR)
 542                    && (ifp->ptm_status != ZEBRA_PTM_STATUS_DOWN)) {
 543                 ifp->ptm_status = ZEBRA_PTM_STATUS_DOWN;
 544                 if (ifp->ptm_enable && if_is_no_ptm_operative(ifp))
 545                         if_down(ifp);
 546         }
 547
 548         return 0;
 549 }
 550
 551 /*
 552  * zebra_ptm_handle_msg_cb - The purpose of this callback function is to handle
 553  *  all the command responses and notifications received from PTM.
 554  *
 555  * Command responses: Upon establishing connection with PTM, Zebra requests
 556  *  status of all interfaces using 'get-status' command if global ptm-enable
 557  *  knob is enabled. As a response to the get-status command PTM sends status
 558  *  of all the interfaces as command responses. All other type of command
 559  *  responses with cmd_status key word  are dropped. The sole purpose of
 560  *  registering this function as callback for the command responses is to
 561  *  handle the responses to get-status command.
 562  *
 563  * Notifications: Cable status and BFD session status changes are sent as
 564  *  notifications by PTM. So, this function is also the callback function for
 565  *  processing all the notifications from the PTM.
 566  *
 567  */
 568 static int zebra_ptm_handle_msg_cb(void *arg, void *in_ctxt)
 569 {
 570         struct interface *ifp = NULL;
 571         char port_str[128];
 572         char cbl_str[32];
 573         char cmd_status_str[32];
 574
 575         ptm_lib_find_key_in_msg(in_ctxt, ZEBRA_PTM_CMD_STATUS_STR,
 576                                 cmd_status_str);
 577
 578         /* Drop command response messages */
 579         if (cmd_status_str[0] != '\0') {
 580                 return 0;
 581         }
 582
 583         ptm_lib_find_key_in_msg(in_ctxt, ZEBRA_PTM_PORT_STR, port_str);
 584
 585         if (port_str[0] == '\0') {
 586                 zlog_debug("%s: Key %s not found in PTM msg", __func__,
 587                            ZEBRA_PTM_PORT_STR);
 588                 return -1;
 589         }
 590
 591         if (strcmp(ZEBRA_PTM_INVALID_PORT_NAME, port_str)) {
 592                 struct vrf *vrf;
 593                 int count = 0;
 594
 595                 RB_FOREACH (vrf, vrf_id_head, &vrfs_by_id) {
 596                         ifp = if_lookup_by_name_vrf(port_str, vrf);
 597                         if (ifp) {
 598                                 count++;
 599                                 if (!vrf_is_backend_netns())
 600                                         break;
 601                         }
 602                 }
 603
 604                 if (!ifp) {
 605                         flog_warn(EC_ZEBRA_UNKNOWN_INTERFACE,
 606                                   "%s: %s not found in interface list",
 607                                   __func__, port_str);
 608                         return -1;
 609                 }
 610                 if (count > 1) {
 611                         flog_warn(EC_ZEBRA_UNKNOWN_INTERFACE,
 612                                   "%s: multiple interface with name %s",
 613                                   __func__, port_str);
 614                         return -1;
 615                 }
 616         }
 617
 618         ptm_lib_find_key_in_msg(in_ctxt, ZEBRA_PTM_CBL_STR, cbl_str);
 619
 620         if (cbl_str[0] == '\0') {
 621                 return zebra_ptm_handle_bfd_msg(arg, in_ctxt, ifp);
 622         } else {
 623                 if (ifp) {
 624                         return zebra_ptm_handle_cbl_msg(arg, in_ctxt, ifp,
 625                                                         cbl_str);
 626                 } else {
 627                         return -1;
 628                 }
 629         }
 630 }
 631
 632 void zebra_ptm_sock_read(struct thread *thread)
 633 {
 634         int sock;
 635         int rc;
 636
 637         errno = 0;
 638         sock = THREAD_FD(thread);
 639
 640         if (sock == -1)
 641                 return;
 642
 643         /* PTM communicates in CSV format */
 644         do {
 645                 rc = ptm_lib_process_msg(ptm_hdl, sock, ptm_cb.in_data,
 646                                          ZEBRA_PTM_MAX_SOCKBUF, NULL);
 647         } while (rc > 0);
 648
 649         if (((rc == 0) && !errno)
 650             || (errno && (errno != EWOULDBLOCK) && (errno != EAGAIN))) {
 651                 flog_err_sys(EC_LIB_SOCKET,
 652                              "%s routing socket error: %s(%d) bytes %d",
 653                              __func__, safe_strerror(errno), errno, rc);
 654
 655                 close(ptm_cb.ptm_sock);
 656                 ptm_cb.ptm_sock = -1;
 657                 zebra_ptm_reset_status(0);
 658                 ptm_cb.t_timer = NULL;
 659                 thread_add_timer(zrouter.master, zebra_ptm_connect, NULL,
 660                                  ptm_cb.reconnect_time,
 661                                  &ptm_cb.t_timer);
 662                 return;
 663         }
 664
 665         ptm_cb.t_read = NULL;
 666         thread_add_read(zrouter.master, zebra_ptm_sock_read, NULL,
 667                         ptm_cb.ptm_sock, &ptm_cb.t_read);
 668 }
 669
 670 /* BFD peer/dst register/update */
 671 void zebra_ptm_bfd_dst_register(ZAPI_HANDLER_ARGS)
 672 {
 673         struct stream *s;
 674         struct prefix src_p;
 675         struct prefix dst_p;
 676         uint8_t multi_hop;
 677         uint8_t multi_hop_cnt;
 678         uint8_t detect_mul;
 679         unsigned int min_rx_timer;
 680         unsigned int min_tx_timer;
 681         char if_name[INTERFACE_NAMSIZ];
 682         uint8_t len;
 683         void *out_ctxt;
 684         char buf[INET6_ADDRSTRLEN];
 685         char tmp_buf[64];
 686         int data_len = ZEBRA_PTM_SEND_MAX_SOCKBUF;
 687         unsigned int pid;
 688         uint8_t cbit_set;
 689
 690         if (hdr->command == ZEBRA_BFD_DEST_UPDATE)
 691                 client->bfd_peer_upd8_cnt++;
 692         else
 693                 client->bfd_peer_add_cnt++;
 694
 695         if (IS_ZEBRA_DEBUG_EVENT)
 696                 zlog_debug("bfd_dst_register msg from client %s: length=%d",
 697                            zebra_route_string(client->proto), hdr->length);
 698
 699         if (ptm_cb.ptm_sock == -1) {
 700                 ptm_cb.t_timer = NULL;
 701                 thread_add_timer(zrouter.master, zebra_ptm_connect, NULL,
 702                                  ptm_cb.reconnect_time, &ptm_cb.t_timer);
 703                 return;
 704         }
 705
 706         ptm_lib_init_msg(ptm_hdl, 0, PTMLIB_MSG_TYPE_CMD, NULL, &out_ctxt);
 707         snprintf(tmp_buf, sizeof(tmp_buf), "%s", ZEBRA_PTM_BFD_START_CMD);
 708         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_CMD_STR, tmp_buf);
 709         snprintf(tmp_buf, sizeof(tmp_buf), "%s",
 710                  zebra_route_string(client->proto));
 711         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_CLIENT_FIELD,
 712                            tmp_buf);
 713
 714         s = msg;
 715
 716         STREAM_GETL(s, pid);
 717         snprintf(tmp_buf, sizeof(tmp_buf), "%d", pid);
 718         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_SEQID_FIELD,
 719                            tmp_buf);
 720
 721         STREAM_GETW(s, dst_p.family);
 722
 723         if (dst_p.family == AF_INET)
 724                 dst_p.prefixlen = IPV4_MAX_BYTELEN;
 725         else
 726                 dst_p.prefixlen = IPV6_MAX_BYTELEN;
 727
 728         STREAM_GET(&dst_p.u.prefix, s, dst_p.prefixlen);
 729         if (dst_p.family == AF_INET) {
 730                 inet_ntop(AF_INET, &dst_p.u.prefix4, buf, sizeof(buf));
 731                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 732                                    ZEBRA_PTM_BFD_DST_IP_FIELD, buf);
 733         } else {
 734                 inet_ntop(AF_INET6, &dst_p.u.prefix6, buf, sizeof(buf));
 735                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 736                                    ZEBRA_PTM_BFD_DST_IP_FIELD, buf);
 737         }
 738
 739         STREAM_GETL(s, min_rx_timer);
 740         snprintf(tmp_buf, sizeof(tmp_buf), "%d", min_rx_timer);
 741         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_MIN_RX_FIELD,
 742                            tmp_buf);
 743         STREAM_GETL(s, min_tx_timer);
 744         snprintf(tmp_buf, sizeof(tmp_buf), "%d", min_tx_timer);
 745         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_MIN_TX_FIELD,
 746                            tmp_buf);
 747         STREAM_GETC(s, detect_mul);
 748         snprintf(tmp_buf, sizeof(tmp_buf), "%d", detect_mul);
 749         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_DETECT_MULT_FIELD,
 750                            tmp_buf);
 751
 752         STREAM_GETC(s, multi_hop);
 753         if (multi_hop) {
 754                 snprintf(tmp_buf, sizeof(tmp_buf), "%d", 1);
 755                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 756                                    ZEBRA_PTM_BFD_MULTI_HOP_FIELD, tmp_buf);
 757                 STREAM_GETW(s, src_p.family);
 758
 759                 if (src_p.family == AF_INET)
 760                         src_p.prefixlen = IPV4_MAX_BYTELEN;
 761                 else
 762                         src_p.prefixlen = IPV6_MAX_BYTELEN;
 763
 764                 STREAM_GET(&src_p.u.prefix, s, src_p.prefixlen);
 765                 if (src_p.family == AF_INET) {
 766                         inet_ntop(AF_INET, &src_p.u.prefix4, buf, sizeof(buf));
 767                         ptm_lib_append_msg(ptm_hdl, out_ctxt,
 768                                            ZEBRA_PTM_BFD_SRC_IP_FIELD, buf);
 769                 } else {
 770                         inet_ntop(AF_INET6, &src_p.u.prefix6, buf, sizeof(buf));
 771                         ptm_lib_append_msg(ptm_hdl, out_ctxt,
 772                                            ZEBRA_PTM_BFD_SRC_IP_FIELD, buf);
 773                 }
 774
 775                 STREAM_GETC(s, multi_hop_cnt);
 776                 snprintf(tmp_buf, sizeof(tmp_buf), "%d", multi_hop_cnt);
 777                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 778                                    ZEBRA_PTM_BFD_MAX_HOP_CNT_FIELD, tmp_buf);
 779
 780                 if (zvrf_id(zvrf) != VRF_DEFAULT)
 781                         ptm_lib_append_msg(ptm_hdl, out_ctxt,
 782                                            ZEBRA_PTM_BFD_VRF_NAME_FIELD,
 783                                            zvrf_name(zvrf));
 784         } else {
 785                 if (dst_p.family == AF_INET6) {
 786                         STREAM_GETW(s, src_p.family);
 787
 788                         if (src_p.family == AF_INET)
 789                                 src_p.prefixlen = IPV4_MAX_BYTELEN;
 790                         else
 791                                 src_p.prefixlen = IPV6_MAX_BYTELEN;
 792
 793                         STREAM_GET(&src_p.u.prefix, s, src_p.prefixlen);
 794                         if (src_p.family == AF_INET) {
 795                                 inet_ntop(AF_INET, &src_p.u.prefix4, buf,
 796                                           sizeof(buf));
 797                                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 798                                                    ZEBRA_PTM_BFD_SRC_IP_FIELD,
 799                                                    buf);
 800                         } else {
 801                                 inet_ntop(AF_INET6, &src_p.u.prefix6, buf,
 802                                           sizeof(buf));
 803                                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 804                                                    ZEBRA_PTM_BFD_SRC_IP_FIELD,
 805                                                    buf);
 806                         }
 807                 }
 808                 STREAM_GETC(s, len);
 809                 STREAM_GET(if_name, s, len);
 810                 if_name[len] = '\0';
 811
 812                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 813                                    ZEBRA_PTM_BFD_IFNAME_FIELD, if_name);
 814         }
 815         STREAM_GETC(s, cbit_set);
 816         snprintf(tmp_buf, sizeof(tmp_buf), "%d", cbit_set);
 817         ptm_lib_append_msg(ptm_hdl, out_ctxt,
 818                            ZEBRA_PTM_BFD_CBIT_FIELD, tmp_buf);
 819
 820         snprintf(tmp_buf, sizeof(tmp_buf), "%d", 1);
 821         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_SEND_EVENT,
 822                            tmp_buf);
 823
 824         ptm_lib_complete_msg(ptm_hdl, out_ctxt, ptm_cb.out_data, &data_len);
 825
 826         if (IS_ZEBRA_DEBUG_SEND)
 827                 zlog_debug("%s: Sent message (%d) %s", __func__, data_len,
 828                            ptm_cb.out_data);
 829         zebra_ptm_send_message(ptm_cb.out_data, data_len);
 830
 831         return;
 832
 833 stream_failure:
 834         ptm_lib_cleanup_msg(ptm_hdl, out_ctxt);
 835 }
 836
 837 /* BFD peer/dst deregister */
 838 void zebra_ptm_bfd_dst_deregister(ZAPI_HANDLER_ARGS)
 839 {
 840         struct stream *s;
 841         struct prefix src_p;
 842         struct prefix dst_p;
 843         uint8_t multi_hop;
 844         char if_name[INTERFACE_NAMSIZ];
 845         uint8_t len;
 846         char buf[INET6_ADDRSTRLEN];
 847         char tmp_buf[64];
 848         int data_len = ZEBRA_PTM_SEND_MAX_SOCKBUF;
 849         void *out_ctxt;
 850         unsigned int pid;
 851
 852         client->bfd_peer_del_cnt++;
 853
 854         if (IS_ZEBRA_DEBUG_EVENT)
 855                 zlog_debug("bfd_dst_deregister msg from client %s: length=%d",
 856                            zebra_route_string(client->proto), hdr->length);
 857
 858         if (ptm_cb.ptm_sock == -1) {
 859                 ptm_cb.t_timer = NULL;
 860                 thread_add_timer(zrouter.master, zebra_ptm_connect, NULL,
 861                                  ptm_cb.reconnect_time, &ptm_cb.t_timer);
 862                 return;
 863         }
 864
 865         ptm_lib_init_msg(ptm_hdl, 0, PTMLIB_MSG_TYPE_CMD, NULL, &out_ctxt);
 866
 867         snprintf(tmp_buf, sizeof(tmp_buf), "%s", ZEBRA_PTM_BFD_STOP_CMD);
 868         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_CMD_STR, tmp_buf);
 869
 870         snprintf(tmp_buf, sizeof(tmp_buf), "%s",
 871                  zebra_route_string(client->proto));
 872         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_CLIENT_FIELD,
 873                            tmp_buf);
 874
 875         s = msg;
 876
 877         STREAM_GETL(s, pid);
 878         snprintf(tmp_buf, sizeof(tmp_buf), "%d", pid);
 879         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_SEQID_FIELD,
 880                            tmp_buf);
 881
 882         STREAM_GETW(s, dst_p.family);
 883
 884         if (dst_p.family == AF_INET)
 885                 dst_p.prefixlen = IPV4_MAX_BYTELEN;
 886         else
 887                 dst_p.prefixlen = IPV6_MAX_BYTELEN;
 888
 889         STREAM_GET(&dst_p.u.prefix, s, dst_p.prefixlen);
 890         if (dst_p.family == AF_INET)
 891                 inet_ntop(AF_INET, &dst_p.u.prefix4, buf, sizeof(buf));
 892         else
 893                 inet_ntop(AF_INET6, &dst_p.u.prefix6, buf, sizeof(buf));
 894         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_DST_IP_FIELD, buf);
 895
 896
 897         STREAM_GETC(s, multi_hop);
 898         if (multi_hop) {
 899                 snprintf(tmp_buf, sizeof(tmp_buf), "%d", 1);
 900                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 901                                    ZEBRA_PTM_BFD_MULTI_HOP_FIELD, tmp_buf);
 902
 903                 STREAM_GETW(s, src_p.family);
 904
 905                 if (src_p.family == AF_INET)
 906                         src_p.prefixlen = IPV4_MAX_BYTELEN;
 907                 else
 908                         src_p.prefixlen = IPV6_MAX_BYTELEN;
 909
 910                 STREAM_GET(&src_p.u.prefix, s, src_p.prefixlen);
 911                 if (src_p.family == AF_INET)
 912                         inet_ntop(AF_INET, &src_p.u.prefix4, buf, sizeof(buf));
 913                 else
 914                         inet_ntop(AF_INET6, &src_p.u.prefix6, buf, sizeof(buf));
 915                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 916                                    ZEBRA_PTM_BFD_SRC_IP_FIELD, buf);
 917
 918                 if (zvrf_id(zvrf) != VRF_DEFAULT)
 919                         ptm_lib_append_msg(ptm_hdl, out_ctxt,
 920                                            ZEBRA_PTM_BFD_VRF_NAME_FIELD,
 921                                            zvrf_name(zvrf));
 922         } else {
 923                 if (dst_p.family == AF_INET6) {
 924                         STREAM_GETW(s, src_p.family);
 925
 926                         if (src_p.family == AF_INET)
 927                                 src_p.prefixlen = IPV4_MAX_BYTELEN;
 928                         else
 929                                 src_p.prefixlen = IPV6_MAX_BYTELEN;
 930
 931                         STREAM_GET(&src_p.u.prefix, s, src_p.prefixlen);
 932                         if (src_p.family == AF_INET) {
 933                                 inet_ntop(AF_INET, &src_p.u.prefix4, buf,
 934                                           sizeof(buf));
 935                                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 936                                                    ZEBRA_PTM_BFD_SRC_IP_FIELD,
 937                                                    buf);
 938                         } else {
 939                                 inet_ntop(AF_INET6, &src_p.u.prefix6, buf,
 940                                           sizeof(buf));
 941                                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 942                                                    ZEBRA_PTM_BFD_SRC_IP_FIELD,
 943                                                    buf);
 944                         }
 945                 }
 946
 947                 STREAM_GETC(s, len);
 948                 STREAM_GET(if_name, s, len);
 949                 if_name[len] = '\0';
 950
 951                 ptm_lib_append_msg(ptm_hdl, out_ctxt,
 952                                    ZEBRA_PTM_BFD_IFNAME_FIELD, if_name);
 953         }
 954
 955         ptm_lib_complete_msg(ptm_hdl, out_ctxt, ptm_cb.out_data, &data_len);
 956         if (IS_ZEBRA_DEBUG_SEND)
 957                 zlog_debug("%s: Sent message (%d) %s", __func__, data_len,
 958                            ptm_cb.out_data);
 959
 960         zebra_ptm_send_message(ptm_cb.out_data, data_len);
 961
 962         return;
 963
 964 stream_failure:
 965         ptm_lib_cleanup_msg(ptm_hdl, out_ctxt);
 966 }
 967
 968 /* BFD client register */
 969 void zebra_ptm_bfd_client_register(ZAPI_HANDLER_ARGS)
 970 {
 971         struct stream *s;
 972         unsigned int pid;
 973         void *out_ctxt = NULL;
 974         char tmp_buf[64];
 975         int data_len = ZEBRA_PTM_SEND_MAX_SOCKBUF;
 976
 977         client->bfd_client_reg_cnt++;
 978
 979         if (IS_ZEBRA_DEBUG_EVENT)
 980                 zlog_debug("bfd_client_register msg from client %s: length=%d",
 981                            zebra_route_string(client->proto), hdr->length);
 982
 983         s = msg;
 984         STREAM_GETL(s, pid);
 985
 986         if (ptm_cb.ptm_sock == -1) {
 987                 ptm_cb.t_timer = NULL;
 988                 thread_add_timer(zrouter.master, zebra_ptm_connect, NULL,
 989                                  ptm_cb.reconnect_time, &ptm_cb.t_timer);
 990                 return;
 991         }
 992
 993         ptm_lib_init_msg(ptm_hdl, 0, PTMLIB_MSG_TYPE_CMD, NULL, &out_ctxt);
 994
 995         snprintf(tmp_buf, sizeof(tmp_buf), "%s", ZEBRA_PTM_BFD_CLIENT_REG_CMD);
 996         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_CMD_STR, tmp_buf);
 997
 998         snprintf(tmp_buf, sizeof(tmp_buf), "%s",
 999                  zebra_route_string(client->proto));
1000         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_CLIENT_FIELD,
1001                            tmp_buf);
1002
1003         snprintf(tmp_buf, sizeof(tmp_buf), "%d", pid);
1004         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_SEQID_FIELD,
1005                            tmp_buf);
1006
1007         ptm_lib_complete_msg(ptm_hdl, out_ctxt, ptm_cb.out_data, &data_len);
1008
1009         if (IS_ZEBRA_DEBUG_SEND)
1010                 zlog_debug("%s: Sent message (%d) %s", __func__, data_len,
1011                            ptm_cb.out_data);
1012         zebra_ptm_send_message(ptm_cb.out_data, data_len);
1013
1014         SET_FLAG(ptm_cb.client_flags[client->proto],
1015                  ZEBRA_PTM_BFD_CLIENT_FLAG_REG);
1016
1017         return;
1018
1019 stream_failure:
1020         /*
1021          * IF we ever add more STREAM_GETXXX functions after the out_ctxt
1022          * is allocated then we need to add this code back in
1023          *
1024          * if (out_ctxt)
1025          *      ptm_lib_cleanup_msg(ptm_hdl, out_ctxt);
1026          */
1027         return;
1028 }
1029
1030 /* BFD client deregister */
1031 int zebra_ptm_bfd_client_deregister(struct zserv *client)
1032 {
1033         uint8_t proto = client->proto;
1034         void *out_ctxt;
1035         char tmp_buf[64];
1036         int data_len = ZEBRA_PTM_SEND_MAX_SOCKBUF;
1037
1038         if (!IS_BFD_ENABLED_PROTOCOL(proto))
1039                 return 0;
1040
1041         if (IS_ZEBRA_DEBUG_EVENT)
1042                 zlog_debug("bfd_client_deregister msg for client %s",
1043                            zebra_route_string(proto));
1044
1045         if (ptm_cb.ptm_sock == -1) {
1046                 ptm_cb.t_timer = NULL;
1047                 thread_add_timer(zrouter.master, zebra_ptm_connect, NULL,
1048                                  ptm_cb.reconnect_time, &ptm_cb.t_timer);
1049                 return 0;
1050         }
1051
1052         ptm_lib_init_msg(ptm_hdl, 0, PTMLIB_MSG_TYPE_CMD, NULL, &out_ctxt);
1053
1054         snprintf(tmp_buf, sizeof(tmp_buf), "%s",
1055                  ZEBRA_PTM_BFD_CLIENT_DEREG_CMD);
1056         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_CMD_STR, tmp_buf);
1057
1058         snprintf(tmp_buf, sizeof(tmp_buf), "%s", zebra_route_string(proto));
1059         ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_BFD_CLIENT_FIELD,
1060                            tmp_buf);
1061
1062         ptm_lib_complete_msg(ptm_hdl, out_ctxt, ptm_cb.out_data, &data_len);
1063
1064         if (IS_ZEBRA_DEBUG_SEND)
1065                 zlog_debug("%s: Sent message (%d) %s", __func__, data_len,
1066                            ptm_cb.out_data);
1067
1068         zebra_ptm_send_message(ptm_cb.out_data, data_len);
1069         UNSET_FLAG(ptm_cb.client_flags[proto], ZEBRA_PTM_BFD_CLIENT_FLAG_REG);
1070
1071         return 0;
1072 }
1073
1074 int zebra_ptm_get_enable_state(void)
1075 {
1076         return ptm_cb.ptm_enable;
1077 }
1078
1079 /*
1080  * zebra_ptm_get_status_str - Convert status to a display string.
1081  */
1082 static const char *zebra_ptm_get_status_str(int status)
1083 {
1084         switch (status) {
1085         case ZEBRA_PTM_STATUS_DOWN:
1086                 return "fail";
1087         case ZEBRA_PTM_STATUS_UP:
1088                 return "pass";
1089         case ZEBRA_PTM_STATUS_UNKNOWN:
1090         default:
1091                 return "n/a";
1092         }
1093 }
1094
1095 void zebra_ptm_show_status(struct vty *vty, json_object *json,
1096                            struct interface *ifp)
1097 {
1098         const char *status;
1099
1100         if (ifp->ptm_enable)
1101                 status = zebra_ptm_get_status_str(ifp->ptm_status);
1102         else
1103                 status = "disabled";
1104
1105         if (json)
1106                 json_object_string_add(json, "ptmStatus", status);
1107         else
1108                 vty_out(vty, "  PTM status: %s\n", status);
1109 }
1110
1111 void zebra_ptm_send_status_req(void)
1112 {
1113         void *out_ctxt;
1114         int len = ZEBRA_PTM_SEND_MAX_SOCKBUF;
1115
1116         if (ptm_cb.ptm_enable) {
1117                 ptm_lib_init_msg(ptm_hdl, 0, PTMLIB_MSG_TYPE_CMD, NULL,
1118                                  &out_ctxt);
1119                 ptm_lib_append_msg(ptm_hdl, out_ctxt, ZEBRA_PTM_CMD_STR,
1120                                    ZEBRA_PTM_GET_STATUS_CMD);
1121                 ptm_lib_complete_msg(ptm_hdl, out_ctxt, ptm_cb.out_data, &len);
1122
1123                 zebra_ptm_send_message(ptm_cb.out_data, len);
1124         }
1125 }
1126
1127 void zebra_ptm_reset_status(int ptm_disable)
1128 {
1129         struct vrf *vrf;
1130         struct interface *ifp;
1131         int send_linkup;
1132
1133         RB_FOREACH (vrf, vrf_id_head, &vrfs_by_id)
1134                 FOR_ALL_INTERFACES (vrf, ifp) {
1135                         send_linkup = 0;
1136                         if (ifp->ptm_enable) {
1137                                 if (!if_is_operative(ifp))
1138                                         send_linkup = 1;
1139
1140                                 if (ptm_disable)
1141                                         ifp->ptm_enable =
1142                                                 ZEBRA_IF_PTM_ENABLE_OFF;
1143                                 ifp->ptm_status = ZEBRA_PTM_STATUS_UNKNOWN;
1144
1145                                 if (if_is_operative(ifp) && send_linkup) {
1146                                         if (IS_ZEBRA_DEBUG_EVENT)
1147                                                 zlog_debug(
1148                                                         "%s: Bringing up interface %s",
1149                                                         __func__, ifp->name);
1150                                         if_up(ifp, true);
1151                                 }
1152                         }
1153                 }
1154 }
1155
1156 void zebra_ptm_if_init(struct zebra_if *zebra_ifp)
1157 {
1158         zebra_ifp->ptm_enable = ZEBRA_IF_PTM_ENABLE_UNSPEC;
1159 }
1160
1161 void zebra_ptm_if_set_ptm_state(struct interface *ifp,
1162                                 struct zebra_if *zebra_ifp)
1163 {
1164         if (zebra_ifp && zebra_ifp->ptm_enable != ZEBRA_IF_PTM_ENABLE_UNSPEC)
1165                 ifp->ptm_enable = zebra_ifp->ptm_enable;
1166 }
1167
1168 void zebra_ptm_if_write(struct vty *vty, struct zebra_if *zebra_ifp)
1169 {
1170         if (zebra_ifp->ptm_enable == ZEBRA_IF_PTM_ENABLE_OFF)
1171                 vty_out(vty, " no ptm-enable\n");
1172 }
1173
1174 #else /* HAVE_BFDD */
1175
1176 /*
1177  * Data structures.
1178  */
1179 struct ptm_process {
1180         struct zserv *pp_zs;
1181         pid_t pp_pid;
1182
1183         TAILQ_ENTRY(ptm_process) pp_entry;
1184 };
1185 TAILQ_HEAD(ppqueue, ptm_process) ppqueue;
1186
1187 DEFINE_MTYPE_STATIC(ZEBRA, ZEBRA_PTM_BFD_PROCESS,
1188                     "PTM BFD process registration table.");
1189
1190 /*
1191  * Prototypes.
1192  */
1193 static struct ptm_process *pp_new(pid_t pid, struct zserv *zs);
1194 static struct ptm_process *pp_lookup_byzs(struct zserv *zs);
1195 static void pp_free(struct ptm_process *pp);
1196 static void pp_free_all(void);
1197
1198 static void zebra_ptm_send_bfdd(struct stream *msg);
1199 static void zebra_ptm_send_clients(struct stream *msg);
1200 static int _zebra_ptm_bfd_client_deregister(struct zserv *zs);
1201 static void _zebra_ptm_reroute(struct zserv *zs, struct zebra_vrf *zvrf,
1202                                struct stream *msg, uint32_t command);
1203
1204
1205 /*
1206  * Process PID registration.
1207  */
1208 static struct ptm_process *pp_new(pid_t pid, struct zserv *zs)
1209 {
1210         struct ptm_process *pp;
1211
1212 #ifdef PTM_DEBUG
1213         /* Sanity check: more than one client can't have the same PID. */
1214         TAILQ_FOREACH(pp, &ppqueue, pp_entry) {
1215                 if (pp->pp_pid == pid && pp->pp_zs != zs)
1216                         zlog_err("%s:%d pid and client pointer doesn't match",
1217                                  __FILE__, __LINE__);
1218         }
1219 #endif /* PTM_DEBUG */
1220
1221         /* Lookup for duplicates. */
1222         pp = pp_lookup_byzs(zs);
1223         if (pp != NULL)
1224                 return pp;
1225
1226         /* Allocate and register new process. */
1227         pp = XCALLOC(MTYPE_ZEBRA_PTM_BFD_PROCESS, sizeof(*pp));
1228
1229         pp->pp_pid = pid;
1230         pp->pp_zs = zs;
1231         TAILQ_INSERT_HEAD(&ppqueue, pp, pp_entry);
1232
1233         return pp;
1234 }
1235
1236 static struct ptm_process *pp_lookup_byzs(struct zserv *zs)
1237 {
1238         struct ptm_process *pp;
1239
1240         TAILQ_FOREACH(pp, &ppqueue, pp_entry) {
1241                 if (pp->pp_zs != zs)
1242                         continue;
1243
1244                 break;
1245         }
1246
1247         return pp;
1248 }
1249
1250 static void pp_free(struct ptm_process *pp)
1251 {
1252         if (pp == NULL)
1253                 return;
1254
1255         TAILQ_REMOVE(&ppqueue, pp, pp_entry);
1256         XFREE(MTYPE_ZEBRA_PTM_BFD_PROCESS, pp);
1257 }
1258
1259 static void pp_free_all(void)
1260 {
1261         struct ptm_process *pp;
1262
1263         while (!TAILQ_EMPTY(&ppqueue)) {
1264                 pp = TAILQ_FIRST(&ppqueue);
1265                 pp_free(pp);
1266         }
1267 }
1268
1269
1270 /*
1271  * Use the FRR's internal daemon implementation.
1272  */
1273 static void zebra_ptm_send_bfdd(struct stream *msg)
1274 {
1275         struct listnode *node;
1276         struct zserv *client;
1277         struct stream *msgc;
1278
1279         /* Create copy for replication. */
1280         msgc = stream_dup(msg);
1281
1282         /* Send message to all running BFDd daemons. */
1283         for (ALL_LIST_ELEMENTS_RO(zrouter.client_list, node, client)) {
1284                 if (client->proto != ZEBRA_ROUTE_BFD)
1285                         continue;
1286
1287                 zserv_send_message(client, msg);
1288
1289                 /* Allocate more messages. */
1290                 msg = stream_dup(msgc);
1291         }
1292
1293         stream_free(msgc);
1294         stream_free(msg);
1295 }
1296
1297 static void zebra_ptm_send_clients(struct stream *msg)
1298 {
1299         struct listnode *node;
1300         struct zserv *client;
1301         struct stream *msgc;
1302
1303         /* Create copy for replication. */
1304         msgc = stream_dup(msg);
1305
1306         /* Send message to all running client daemons. */
1307         for (ALL_LIST_ELEMENTS_RO(zrouter.client_list, node, client)) {
1308                 if (!IS_BFD_ENABLED_PROTOCOL(client->proto))
1309                         continue;
1310
1311                 zserv_send_message(client, msg);
1312
1313                 /* Allocate more messages. */
1314                 msg = stream_dup(msgc);
1315         }
1316
1317         stream_free(msgc);
1318         stream_free(msg);
1319 }
1320
1321 static int _zebra_ptm_bfd_client_deregister(struct zserv *zs)
1322 {
1323         struct stream *msg;
1324         struct ptm_process *pp;
1325
1326         if (!IS_BFD_ENABLED_PROTOCOL(zs->proto))
1327                 return 0;
1328
1329         /* Find daemon pid by zebra connection pointer. */
1330         pp = pp_lookup_byzs(zs);
1331         if (pp == NULL) {
1332                 zlog_err("%s:%d failed to find process pid registration",
1333                          __FILE__, __LINE__);
1334                 return -1;
1335         }
1336
1337         /* Generate, send message and free() daemon related data. */
1338         msg = stream_new(ZEBRA_MAX_PACKET_SIZ);
1339         if (msg == NULL) {
1340                 zlog_debug("%s: not enough memory", __func__);
1341                 return 0;
1342         }
1343
1344         /*
1345          * The message type will be ZEBRA_BFD_DEST_REPLAY so we can use only
1346          * one callback at the `bfdd` side, however the real command
1347          * number will be included right after the zebra header.
1348          */
1349         zclient_create_header(msg, ZEBRA_BFD_DEST_REPLAY, 0);
1350         stream_putl(msg, ZEBRA_BFD_CLIENT_DEREGISTER);
1351
1352         /* Put process PID. */
1353         stream_putl(msg, pp->pp_pid);
1354
1355         /* Update the data pointers. */
1356         stream_putw_at(msg, 0, stream_get_endp(msg));
1357
1358         zebra_ptm_send_bfdd(msg);
1359
1360         pp_free(pp);
1361
1362         return 0;
1363 }
1364
1365 void zebra_ptm_init(void)
1366 {
1367         /* Initialize the ptm process information list. */
1368         TAILQ_INIT(&ppqueue);
1369
1370         /*
1371          * Send deregistration messages to BFD daemon when some other
1372          * daemon closes. This will help avoid sending daemons
1373          * unnecessary notification messages.
1374          */
1375         hook_register(zserv_client_close, _zebra_ptm_bfd_client_deregister);
1376 }
1377
1378 void zebra_ptm_finish(void)
1379 {
1380         /* Remove the client disconnect hook and free all memory. */
1381         hook_unregister(zserv_client_close, _zebra_ptm_bfd_client_deregister);
1382         pp_free_all();
1383 }
1384
1385
1386 /*
1387  * Message handling.
1388  */
1389 static void _zebra_ptm_reroute(struct zserv *zs, struct zebra_vrf *zvrf,
1390                                struct stream *msg, uint32_t command)
1391 {
1392         struct stream *msgc;
1393         char buf[ZEBRA_MAX_PACKET_SIZ];
1394         pid_t ppid;
1395
1396         /* Create BFD header */
1397         msgc = stream_new(ZEBRA_MAX_PACKET_SIZ);
1398         zclient_create_header(msgc, ZEBRA_BFD_DEST_REPLAY, zvrf->vrf->vrf_id);
1399         stream_putl(msgc, command);
1400
1401         if (STREAM_READABLE(msg) > STREAM_WRITEABLE(msgc)) {
1402                 zlog_warn("Cannot fit extended BFD header plus original message contents into ZAPI packet; dropping message");
1403                 goto stream_failure;
1404         }
1405
1406         /* Copy original message, excluding header, into new message */
1407         stream_get_from(buf, msg, stream_get_getp(msg), STREAM_READABLE(msg));
1408         stream_put(msgc, buf, STREAM_READABLE(msg));
1409
1410         /* Update length field */
1411         stream_putw_at(msgc, 0, STREAM_READABLE(msgc));
1412
1413         zebra_ptm_send_bfdd(msgc);
1414         msgc = NULL;
1415
1416         /* Registrate process PID for shutdown hook. */
1417         STREAM_GETL(msg, ppid);
1418         pp_new(ppid, zs);
1419
1420         return;
1421
1422 stream_failure:
1423         if (msgc)
1424                 stream_free(msgc);
1425         zlog_err("%s:%d failed to registrate client pid", __FILE__, __LINE__);
1426 }
1427
1428 void zebra_ptm_bfd_dst_register(ZAPI_HANDLER_ARGS)
1429 {
1430         if (IS_ZEBRA_DEBUG_EVENT)
1431                 zlog_debug("bfd_dst_register msg from client %s: length=%d",
1432                            zebra_route_string(client->proto), hdr->length);
1433
1434         _zebra_ptm_reroute(client, zvrf, msg, ZEBRA_BFD_DEST_REGISTER);
1435 }
1436
1437 void zebra_ptm_bfd_dst_deregister(ZAPI_HANDLER_ARGS)
1438 {
1439         if (IS_ZEBRA_DEBUG_EVENT)
1440                 zlog_debug("bfd_dst_deregister msg from client %s: length=%d",
1441                            zebra_route_string(client->proto), hdr->length);
1442
1443         _zebra_ptm_reroute(client, zvrf, msg, ZEBRA_BFD_DEST_DEREGISTER);
1444 }
1445
1446 void zebra_ptm_bfd_client_register(ZAPI_HANDLER_ARGS)
1447 {
1448         if (IS_ZEBRA_DEBUG_EVENT)
1449                 zlog_debug("bfd_client_register msg from client %s: length=%d",
1450                            zebra_route_string(client->proto), hdr->length);
1451
1452         _zebra_ptm_reroute(client, zvrf, msg, ZEBRA_BFD_CLIENT_REGISTER);
1453 }
1454
1455 void zebra_ptm_bfd_dst_replay(ZAPI_HANDLER_ARGS)
1456 {
1457         struct stream *msgc;
1458         size_t zmsglen, zhdrlen;
1459         uint32_t cmd;
1460
1461         /*
1462          * NOTE:
1463          * Replay messages with HAVE_BFDD are meant to be replayed to
1464          * the client daemons. These messages are composed and
1465          * originated from the `bfdd` daemon.
1466          */
1467         if (IS_ZEBRA_DEBUG_EVENT)
1468                 zlog_debug("bfd_dst_update msg from client %s: length=%d",
1469                            zebra_route_string(client->proto), hdr->length);
1470
1471         /*
1472          * Client messages must be re-routed, otherwise do the `bfdd`
1473          * special treatment.
1474          */
1475         if (client->proto != ZEBRA_ROUTE_BFD) {
1476                 _zebra_ptm_reroute(client, zvrf, msg, ZEBRA_BFD_DEST_REPLAY);
1477                 return;
1478         }
1479
1480         /* Figure out if this is an DEST_UPDATE or DEST_REPLAY. */
1481         if (stream_getl2(msg, &cmd) == false) {
1482                 zlog_err("%s: expected at least 4 bytes (command)", __func__);
1483                 return;
1484         }
1485
1486         /*
1487          * Don't modify message in the zebra API. In order to do that we
1488          * need to allocate a new message stream and copy the message
1489          * provided by zebra.
1490          */
1491         msgc = stream_new(ZEBRA_MAX_PACKET_SIZ);
1492         if (msgc == NULL) {
1493                 zlog_debug("%s: not enough memory", __func__);
1494                 return;
1495         }
1496
1497         /* Calculate our header size plus the message contents. */
1498         if (cmd != ZEBRA_BFD_DEST_REPLAY) {
1499                 zhdrlen = ZEBRA_HEADER_SIZE;
1500                 zmsglen = msg->endp - msg->getp;
1501                 memcpy(msgc->data + zhdrlen, msg->data + msg->getp, zmsglen);
1502
1503                 zclient_create_header(msgc, cmd, zvrf_id(zvrf));
1504
1505                 msgc->getp = 0;
1506                 msgc->endp = zhdrlen + zmsglen;
1507         } else
1508                 zclient_create_header(msgc, cmd, zvrf_id(zvrf));
1509
1510         /* Update the data pointers. */
1511         stream_putw_at(msgc, 0, stream_get_endp(msgc));
1512
1513         zebra_ptm_send_clients(msgc);
1514 }
1515
1516 /*
1517  * Unused functions.
1518  */
1519 void zebra_ptm_if_init(struct zebra_if *zifp __attribute__((__unused__)))
1520 {
1521         /* NOTHING */
1522 }
1523
1524 int zebra_ptm_get_enable_state(void)
1525 {
1526         return 0;
1527 }
1528
1529 void zebra_ptm_show_status(struct vty *vty __attribute__((__unused__)),
1530                            json_object *json __attribute__((__unused__)),
1531                            struct interface *ifp __attribute__((__unused__)))
1532 {
1533         /* NOTHING */
1534 }
1535
1536 void zebra_ptm_write(struct vty *vty __attribute__((__unused__)))
1537 {
1538         /* NOTHING */
1539 }
1540
1541 void zebra_ptm_if_write(struct vty *vty __attribute__((__unused__)),
1542                         struct zebra_if *zifp __attribute__((__unused__)))
1543 {
1544         /* NOTHING */
1545 }
1546 void zebra_ptm_if_set_ptm_state(struct interface *i __attribute__((__unused__)),
1547                                 struct zebra_if *zi __attribute__((__unused__)))
1548 {
1549         /* NOTHING */
1550 }
1551
1552 #endif /* HAVE_BFDD */