lnet/lnet/config.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  */
  31
  32 #define DEBUG_SUBSYSTEM S_LNET
  33
  34 #include <linux/ctype.h>
  35 #include <linux/inetdevice.h>
  36 #include <linux/nsproxy.h>
  37 #include <net/net_namespace.h>
  38 #include <lnet/lib-lnet.h>
  39 #include <net/addrconf.h>
  40
  41 /* tmp struct for parsing routes */
  42 struct lnet_text_buf {
  43         struct list_head        ltb_list;       /* stash on lists */
  44         int                     ltb_size;       /* allocated size */
  45         char                    ltb_text[0];    /* text buffer */
  46 };
  47
  48 static int lnet_tbnob = 0;                      /* track text buf allocation */
  49 #define LNET_MAX_TEXTBUF_NOB     (64<<10)       /* bound allocation */
  50 #define LNET_SINGLE_TEXTBUF_NOB  (4<<10)
  51
  52 #define SPACESTR " \t\v\r\n"
  53 #define DELIMITERS ":()[]"
  54
  55 #ifndef HAVE_STRSCPY
  56 #define strscpy(s1, s2, sz)     strlcpy((s1), (s2), (sz))
  57 #endif
  58
  59 static void
  60 lnet_syntax(const char *name, const char *str, int offset, int width)
  61 {
  62         static char dots[LNET_SINGLE_TEXTBUF_NOB];
  63         static char dashes[LNET_SINGLE_TEXTBUF_NOB];
  64
  65         memset(dots, '.', sizeof(dots));
  66         dots[sizeof(dots)-1] = 0;
  67         memset(dashes, '-', sizeof(dashes));
  68         dashes[sizeof(dashes)-1] = 0;
  69
  70         LCONSOLE_ERROR_MSG(0x10f, "Error parsing '%s=\"%s\"'\n", name, str);
  71         LCONSOLE_ERROR_MSG(0x110, "here...........%.*s..%.*s|%.*s|\n",
  72                            (int)strlen(name), dots, offset, dots,
  73                             (width < 1) ? 0 : width - 1, dashes);
  74 }
  75
  76 static int
  77 lnet_issep (char c)
  78 {
  79         switch (c) {
  80         case '\n':
  81         case '\r':
  82         case ';':
  83                 return 1;
  84         default:
  85                 return 0;
  86         }
  87 }
  88
  89 bool
  90 lnet_net_unique(__u32 net_id, struct list_head *netlist,
  91                 struct lnet_net **net)
  92 {
  93         struct lnet_net  *net_l;
  94
  95         if (!netlist)
  96                 return true;
  97
  98         list_for_each_entry(net_l, netlist, net_list) {
  99                 if (net_l->net_id == net_id) {
 100                         if (net != NULL)
 101                                 *net = net_l;
 102                         return false;
 103                 }
 104         }
 105
 106         return true;
 107 }
 108
 109 /* check that the NI is unique within the list of NIs already added to
 110  * a network */
 111 bool
 112 lnet_ni_unique_net(struct list_head *nilist, char *iface)
 113 {
 114         struct list_head *tmp;
 115         struct lnet_ni *ni;
 116
 117         list_for_each(tmp, nilist) {
 118                 ni = list_entry(tmp, struct lnet_ni, ni_netlist);
 119
 120                 if (ni->ni_interface != NULL &&
 121                     strncmp(ni->ni_interface, iface, strlen(iface)) == 0)
 122                         return false;
 123         }
 124
 125         return true;
 126 }
 127 static bool
 128 in_array(__u32 *array, __u32 size, __u32 value)
 129 {
 130         int i;
 131
 132         for (i = 0; i < size; i++) {
 133                 if (array[i] == value)
 134                         return false;
 135         }
 136
 137         return true;
 138 }
 139
 140 static int
 141 lnet_net_append_cpts(__u32 *cpts, __u32 ncpts, struct lnet_net *net)
 142 {
 143         __u32 *added_cpts = NULL;
 144         int i, j = 0, rc = 0;
 145
 146         /*
 147          * no need to go futher since a subset of the NIs already exist on
 148          * all CPTs
 149          */
 150         if (net->net_ncpts == LNET_CPT_NUMBER)
 151                 return 0;
 152
 153         if (cpts == NULL) {
 154                 /* there is an NI which will exist on all CPTs */
 155                 if (net->net_cpts != NULL)
 156                         CFS_FREE_PTR_ARRAY(net->net_cpts, net->net_ncpts);
 157                 net->net_cpts = NULL;
 158                 net->net_ncpts = LNET_CPT_NUMBER;
 159                 return 0;
 160         }
 161
 162         if (net->net_cpts == NULL) {
 163                 CFS_ALLOC_PTR_ARRAY(net->net_cpts, ncpts);
 164                 if (net->net_cpts == NULL)
 165                         return -ENOMEM;
 166                 memcpy(net->net_cpts, cpts, ncpts * sizeof(*net->net_cpts));
 167                 net->net_ncpts = ncpts;
 168                 return 0;
 169         }
 170
 171         CFS_ALLOC_PTR_ARRAY(added_cpts, LNET_CPT_NUMBER);
 172         if (added_cpts == NULL)
 173                 return -ENOMEM;
 174
 175         for (i = 0; i < ncpts; i++) {
 176                 if (!in_array(net->net_cpts, net->net_ncpts, cpts[i])) {
 177                         added_cpts[j] = cpts[i];
 178                         j++;
 179                 }
 180         }
 181
 182         /* append the new cpts if any to the list of cpts in the net */
 183         if (j > 0) {
 184                 __u32 *array = NULL, *loc;
 185                 __u32 total_entries = j + net->net_ncpts;
 186
 187                 CFS_ALLOC_PTR_ARRAY(array, total_entries);
 188                 if (array == NULL) {
 189                         rc = -ENOMEM;
 190                         goto failed;
 191                 }
 192
 193                 memcpy(array, net->net_cpts,
 194                        net->net_ncpts * sizeof(*net->net_cpts));
 195                 loc = array + net->net_ncpts;
 196                 memcpy(loc, added_cpts, j * sizeof(*net->net_cpts));
 197
 198                 CFS_FREE_PTR_ARRAY(net->net_cpts, net->net_ncpts);
 199                 net->net_ncpts = total_entries;
 200                 net->net_cpts = array;
 201         }
 202
 203 failed:
 204         CFS_FREE_PTR_ARRAY(added_cpts, LNET_CPT_NUMBER);
 205
 206         return rc;
 207 }
 208
 209 static void
 210 lnet_net_remove_cpts(__u32 *cpts, __u32 ncpts, struct lnet_net *net)
 211 {
 212         struct lnet_ni *ni;
 213         int rc;
 214
 215         /*
 216          * Operation Assumption:
 217          *      This function is called after an NI has been removed from
 218          *      its parent net.
 219          *
 220          * if we're removing an NI which exists on all CPTs then
 221          * we have to check if any of the other NIs on this net also
 222          * exists on all CPTs. If none, then we need to build our Net CPT
 223          * list based on the remaining NIs.
 224          *
 225          * If the NI being removed exist on a subset of the CPTs then we
 226          * alo rebuild the Net CPT list based on the remaining NIs, which
 227          * should resutl in the expected Net CPT list.
 228          */
 229
 230         /*
 231          * sometimes this function can be called due to some failure
 232          * creating an NI, before any of the cpts are allocated, so check
 233          * for that case and don't do anything
 234          */
 235         if (ncpts == 0)
 236                 return;
 237
 238         if (ncpts == LNET_CPT_NUMBER) {
 239                 /*
 240                  * first iteration through the NI list in the net to see
 241                  * if any of the NIs exist on all the CPTs. If one is
 242                  * found then our job is done.
 243                  */
 244                 list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 245                         if (ni->ni_ncpts == LNET_CPT_NUMBER)
 246                                 return;
 247                 }
 248         }
 249
 250         /*
 251          * Rebuild the Net CPT list again, thereby only including only the
 252          * CPTs which the remaining NIs are associated with.
 253          */
 254         if (net->net_cpts != NULL) {
 255                 CFS_FREE_PTR_ARRAY(net->net_cpts, net->net_ncpts);
 256                 net->net_cpts = NULL;
 257         }
 258
 259         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 260                 rc = lnet_net_append_cpts(ni->ni_cpts, ni->ni_ncpts,
 261                                           net);
 262                 if (rc != 0) {
 263                         CERROR("Out of Memory\n");
 264                         /*
 265                          * do our best to keep on going. Delete
 266                          * the net cpts and set it to NULL. This
 267                          * way we can keep on going but less
 268                          * efficiently, since memory accesses might be
 269                          * accross CPT lines.
 270                          */
 271                         if (net->net_cpts != NULL) {
 272                                 CFS_FREE_PTR_ARRAY(net->net_cpts,
 273                                                    net->net_ncpts);
 274                                 net->net_cpts = NULL;
 275                                 net->net_ncpts = LNET_CPT_NUMBER;
 276                         }
 277                         return;
 278                 }
 279         }
 280 }
 281
 282 void
 283 lnet_ni_free(struct lnet_ni *ni)
 284 {
 285         lnet_net_remove_cpts(ni->ni_cpts, ni->ni_ncpts, ni->ni_net);
 286
 287         if (ni->ni_refs != NULL)
 288                 cfs_percpt_free(ni->ni_refs);
 289
 290         if (ni->ni_tx_queues != NULL)
 291                 cfs_percpt_free(ni->ni_tx_queues);
 292
 293         if (ni->ni_cpts != NULL)
 294                 cfs_expr_list_values_free(ni->ni_cpts, ni->ni_ncpts);
 295
 296         if (ni->ni_interface != NULL) {
 297                 LIBCFS_FREE(ni->ni_interface,
 298                             strlen(ni->ni_interface) + 1);
 299         }
 300
 301         /* release reference to net namespace */
 302         if (ni->ni_net_ns != NULL)
 303                 put_net(ni->ni_net_ns);
 304
 305         LIBCFS_FREE(ni, sizeof(*ni));
 306 }
 307
 308 void
 309 lnet_net_free(struct lnet_net *net)
 310 {
 311         struct list_head *tmp, *tmp2;
 312         struct lnet_ni *ni;
 313
 314         LASSERT(list_empty(&net->net_ni_zombie));
 315
 316         /*
 317          * delete any nis that haven't been added yet. This could happen
 318          * if there is a failure on net startup
 319          */
 320         list_for_each_safe(tmp, tmp2, &net->net_ni_added) {
 321                 ni = list_entry(tmp, struct lnet_ni, ni_netlist);
 322                 list_del_init(&ni->ni_netlist);
 323                 lnet_ni_free(ni);
 324         }
 325
 326         /* delete any nis which have been started. */
 327         list_for_each_safe(tmp, tmp2, &net->net_ni_list) {
 328                 ni = list_entry(tmp, struct lnet_ni, ni_netlist);
 329                 list_del_init(&ni->ni_netlist);
 330                 lnet_ni_free(ni);
 331         }
 332
 333         if (net->net_cpts != NULL)
 334                 CFS_FREE_PTR_ARRAY(net->net_cpts, net->net_ncpts);
 335
 336         LIBCFS_FREE(net, sizeof(*net));
 337 }
 338
 339 struct lnet_net *
 340 lnet_net_alloc(__u32 net_id, struct list_head *net_list)
 341 {
 342         struct lnet_net         *net;
 343
 344         if (!lnet_net_unique(net_id, net_list, &net)) {
 345                 CDEBUG(D_NET, "Returning duplicate net %p %s\n", net,
 346                        libcfs_net2str(net->net_id));
 347                 return net;
 348         }
 349
 350         LIBCFS_ALLOC(net, sizeof(*net));
 351         if (net == NULL) {
 352                 CERROR("Out of memory creating network %s\n",
 353                        libcfs_net2str(net_id));
 354                 return NULL;
 355         }
 356
 357         INIT_LIST_HEAD(&net->net_list);
 358         INIT_LIST_HEAD(&net->net_ni_list);
 359         INIT_LIST_HEAD(&net->net_ni_added);
 360         INIT_LIST_HEAD(&net->net_ni_zombie);
 361         INIT_LIST_HEAD(&net->net_rtr_pref_nids);
 362         spin_lock_init(&net->net_lock);
 363
 364         net->net_id = net_id;
 365         net->net_last_alive = ktime_get_seconds();
 366
 367         net->net_sel_priority = LNET_MAX_SELECTION_PRIORITY;
 368
 369         /* initialize global paramters to undefiend */
 370         net->net_tunables.lct_peer_timeout = -1;
 371         net->net_tunables.lct_max_tx_credits = -1;
 372         net->net_tunables.lct_peer_tx_credits = -1;
 373         net->net_tunables.lct_peer_rtr_credits = -1;
 374
 375         if (net_list)
 376                 list_add_tail(&net->net_list, net_list);
 377
 378         return net;
 379 }
 380
 381 static int
 382 lnet_ni_add_interface(struct lnet_ni *ni, char *iface)
 383 {
 384         size_t iface_len = strlen(iface) + 1;
 385
 386         if (ni == NULL)
 387                 return -ENOMEM;
 388
 389         if (ni->ni_interface != NULL) {
 390                 LCONSOLE_ERROR_MSG(0x115, "%s: interface %s already set for net %s: rc = %d\n",
 391                                    iface, ni->ni_interface,
 392                                    libcfs_net2str(LNET_NID_NET(&ni->ni_nid)),
 393                                    -EINVAL);
 394                 return -EINVAL;
 395         }
 396
 397         /* Allocate memory for the interface, so the code parsing input into
 398          * tokens and adding interfaces can free the input safely.
 399          * ni->ni_interface is freed in lnet_ni_free().
 400          */
 401         LIBCFS_ALLOC(ni->ni_interface, iface_len);
 402
 403         if (ni->ni_interface == NULL) {
 404                 CERROR("%s: cannot allocate net interface name: rc = %d\n",
 405                         iface, -ENOMEM);
 406                 return -ENOMEM;
 407         }
 408
 409         strscpy(ni->ni_interface, iface, iface_len);
 410
 411         return 0;
 412 }
 413
 414 static struct lnet_ni *
 415 lnet_ni_alloc_common(struct lnet_net *net, char *iface)
 416 {
 417         struct lnet_tx_queue    *tq;
 418         struct lnet_ni          *ni;
 419         int                     i;
 420
 421         if (iface != NULL)
 422                 /* make sure that this NI is unique in the net it's
 423                  * being added to */
 424                 if (!lnet_ni_unique_net(&net->net_ni_added, iface))
 425                         return NULL;
 426
 427         LIBCFS_ALLOC(ni, sizeof(*ni));
 428         if (ni == NULL) {
 429                 CERROR("Out of memory creating network interface %s%s\n",
 430                        libcfs_net2str(net->net_id),
 431                        (iface != NULL) ? iface : "");
 432                 return NULL;
 433         }
 434
 435         spin_lock_init(&ni->ni_lock);
 436         INIT_LIST_HEAD(&ni->ni_netlist);
 437         INIT_LIST_HEAD(&ni->ni_recovery);
 438         LNetInvalidateMDHandle(&ni->ni_ping_mdh);
 439         ni->ni_refs = cfs_percpt_alloc(lnet_cpt_table(),
 440                                        sizeof(*ni->ni_refs[0]));
 441         if (ni->ni_refs == NULL)
 442                 goto failed;
 443
 444         ni->ni_tx_queues = cfs_percpt_alloc(lnet_cpt_table(),
 445                                             sizeof(*ni->ni_tx_queues[0]));
 446         if (ni->ni_tx_queues == NULL)
 447                 goto failed;
 448
 449         cfs_percpt_for_each(tq, i, ni->ni_tx_queues)
 450                 INIT_LIST_HEAD(&tq->tq_delayed);
 451
 452         ni->ni_net = net;
 453         /* LND will fill in the address part of the NID */
 454         ni->ni_nid.nid_type = LNET_NETTYP(net->net_id);
 455         ni->ni_nid.nid_num = cpu_to_be16(LNET_NETNUM(net->net_id));
 456
 457         /* Store net namespace in which current ni is being created */
 458         if (current->nsproxy && current->nsproxy->net_ns)
 459                 ni->ni_net_ns = get_net(current->nsproxy->net_ns);
 460         else
 461                 ni->ni_net_ns = get_net(&init_net);
 462
 463         ni->ni_state = LNET_NI_STATE_INIT;
 464         ni->ni_sel_priority = LNET_MAX_SELECTION_PRIORITY;
 465         list_add_tail(&ni->ni_netlist, &net->net_ni_added);
 466
 467         /*
 468          * if an interface name is provided then make sure to add in that
 469          * interface name in NI
 470          */
 471         if (iface)
 472                 if (lnet_ni_add_interface(ni, iface) != 0)
 473                         goto failed;
 474
 475         return ni;
 476 failed:
 477         lnet_ni_free(ni);
 478         return NULL;
 479 }
 480
 481 /* allocate and add to the provided network */
 482 struct lnet_ni *
 483 lnet_ni_alloc(struct lnet_net *net, struct cfs_expr_list *el, char *iface)
 484 {
 485         struct lnet_ni          *ni;
 486         int                     rc;
 487
 488         ni = lnet_ni_alloc_common(net, iface);
 489         if (!ni)
 490                 return NULL;
 491
 492         if (!el) {
 493                 ni->ni_cpts  = NULL;
 494                 ni->ni_ncpts = LNET_CPT_NUMBER;
 495         } else {
 496                 rc = cfs_expr_list_values(el, LNET_CPT_NUMBER, &ni->ni_cpts);
 497                 if (rc <= 0) {
 498                         CERROR("Failed to set CPTs for NI %s(%s): %d\n",
 499                                libcfs_net2str(net->net_id),
 500                                (iface != NULL) ? iface : "", rc);
 501                         goto failed;
 502                 }
 503
 504                 LASSERT(rc <= LNET_CPT_NUMBER);
 505                 if (rc == LNET_CPT_NUMBER) {
 506                         CFS_FREE_PTR_ARRAY(ni->ni_cpts, rc);
 507                         ni->ni_cpts = NULL;
 508                 }
 509
 510                 ni->ni_ncpts = rc;
 511         }
 512
 513         rc = lnet_net_append_cpts(ni->ni_cpts, ni->ni_ncpts, net);
 514         if (rc != 0)
 515                 goto failed;
 516
 517         return ni;
 518 failed:
 519         lnet_ni_free(ni);
 520         return NULL;
 521 }
 522
 523 struct lnet_ni *
 524 lnet_ni_alloc_w_cpt_array(struct lnet_net *net, __u32 *cpts, __u32 ncpts,
 525                           char *iface)
 526 {
 527         struct lnet_ni          *ni;
 528         int                     rc;
 529
 530         ni = lnet_ni_alloc_common(net, iface);
 531         if (!ni)
 532                 return NULL;
 533
 534         if (ncpts == 0) {
 535                 ni->ni_cpts  = NULL;
 536                 ni->ni_ncpts = LNET_CPT_NUMBER;
 537         } else {
 538                 size_t array_size = ncpts * sizeof(ni->ni_cpts[0]);
 539
 540                 CFS_ALLOC_PTR_ARRAY(ni->ni_cpts, ncpts);
 541                 if (ni->ni_cpts == NULL)
 542                         goto failed;
 543                 memcpy(ni->ni_cpts, cpts, array_size);
 544                 ni->ni_ncpts = ncpts;
 545         }
 546
 547         rc = lnet_net_append_cpts(ni->ni_cpts, ni->ni_ncpts, net);
 548         if (rc != 0)
 549                 goto failed;
 550
 551         return ni;
 552 failed:
 553         lnet_ni_free(ni);
 554         return NULL;
 555 }
 556
 557 /*
 558  * Parse the networks string and create the matching set of NIs on the
 559  * nilist.
 560  */
 561 int
 562 lnet_parse_networks(struct list_head *netlist, const char *networks)
 563 {
 564         struct cfs_expr_list *net_el = NULL;
 565         struct cfs_expr_list *ni_el = NULL;
 566         int             tokensize;
 567         char            *tokens;
 568         char            *str;
 569         struct lnet_net *net;
 570         struct lnet_ni  *ni = NULL;
 571         __u32           net_id;
 572         int             nnets = 0;
 573
 574         if (networks == NULL) {
 575                 CERROR("networks string is undefined\n");
 576                 return -EINVAL;
 577         }
 578
 579         if (strlen(networks) > LNET_SINGLE_TEXTBUF_NOB) {
 580                 /* _WAY_ conservative */
 581                 LCONSOLE_ERROR_MSG(0x112, "Can't parse networks: string too "
 582                                    "long\n");
 583                 return -EINVAL;
 584         }
 585
 586         tokensize = strlen(networks) + 1;
 587
 588         LIBCFS_ALLOC(tokens, tokensize);
 589         if (tokens == NULL) {
 590                 CERROR("Can't allocate net tokens\n");
 591                 return -ENOMEM;
 592         }
 593
 594         memcpy(tokens, networks, tokensize);
 595         str = tokens;
 596
 597         /*
 598          * Main parser loop.
 599          *
 600          * NB we don't check interface conflicts here; it's the LNDs
 601          * responsibility (if it cares at all)
 602          */
 603         do {
 604                 char *nistr;
 605                 char *elstr;
 606                 char *name;
 607                 int rc;
 608
 609                 /*
 610                  * Parse a network string into its components.
 611                  *
 612                  * <name>{"("...")"}{"["<el>"]"}
 613                  */
 614
 615                 /* Network name (mandatory) */
 616                 while (isspace(*str))
 617                         *str++ = '\0';
 618                 if (!*str)
 619                         break;
 620                 name = str;
 621                 str += strcspn(str, SPACESTR ":()[],");
 622                 while (isspace(*str))
 623                         *str++ = '\0';
 624
 625                 /* Interface list (optional) */
 626                 if (*str == '(') {
 627                         *str++ = '\0';
 628                         nistr = str;
 629                         str += strcspn(str, ")");
 630                         if (*str != ')') {
 631                                 str = nistr;
 632                                 goto failed_syntax;
 633                         }
 634                         do {
 635                                 *str++ = '\0';
 636                         } while (isspace(*str));
 637                 } else {
 638                         nistr = NULL;
 639                 }
 640
 641                 /* CPT expression (optional) */
 642                 if (*str == '[') {
 643                         elstr = str;
 644                         str += strcspn(str, "]");
 645                         if (*str != ']') {
 646                                 str = elstr;
 647                                 goto failed_syntax;
 648                         }
 649                         rc = cfs_expr_list_parse(elstr, str - elstr + 1,
 650                                                 0, LNET_CPT_NUMBER - 1,
 651                                                 &net_el);
 652                         if (rc != 0) {
 653                                 str = elstr;
 654                                 goto failed_syntax;
 655                         }
 656                         *elstr = '\0';
 657                         do {
 658                                 *str++ = '\0';
 659                         } while (isspace(*str));
 660                 }
 661
 662                 /* Bad delimiters */
 663                 if (*str && (strchr(DELIMITERS, *str) != NULL))
 664                         goto failed_syntax;
 665
 666                 /* go to the next net if it exits */
 667                 str += strcspn(str, ",");
 668                 if (*str == ',')
 669                         *str++ = '\0';
 670
 671                 /*
 672                  * At this point the name is properly terminated.
 673                  */
 674                 net_id = libcfs_str2net(name);
 675                 if (net_id == LNET_NET_ANY) {
 676                         LCONSOLE_ERROR_MSG(0x113,
 677                                         "Unrecognised network type\n");
 678                         str = name;
 679                         goto failed_syntax;
 680                 }
 681
 682                 if (LNET_NETTYP(net_id) == LOLND) {
 683                         /* Loopback is implicit, and there can be only one. */
 684                         if (net_el) {
 685                                 cfs_expr_list_free(net_el);
 686                                 net_el = NULL;
 687                         }
 688                         /* Should we error out instead? */
 689                         continue;
 690                 }
 691
 692                 /*
 693                  * All network paramaters are now known.
 694                  */
 695                 nnets++;
 696
 697                 /* always allocate a net, since we will eventually add an
 698                  * interface to it, or we will fail, in which case we'll
 699                  * just delete it */
 700                 net = lnet_net_alloc(net_id, netlist);
 701                 if (IS_ERR_OR_NULL(net))
 702                         goto failed;
 703
 704                 if (!nistr) {
 705                         /*
 706                          * No interface list was specified, allocate a
 707                          * ni using the defaults.
 708                          */
 709                         ni = lnet_ni_alloc(net, net_el, NULL);
 710                         if (IS_ERR_OR_NULL(ni))
 711                                 goto failed;
 712
 713                         if (!nistr) {
 714                                 if (net_el) {
 715                                         cfs_expr_list_free(net_el);
 716                                         net_el = NULL;
 717                                 }
 718                                 continue;
 719                         }
 720                 }
 721
 722                 do {
 723                         elstr = NULL;
 724
 725                         /* Interface name (mandatory) */
 726                         while (isspace(*nistr))
 727                                 *nistr++ = '\0';
 728                         name = nistr;
 729                         nistr += strcspn(nistr, SPACESTR "[],");
 730                         while (isspace(*nistr))
 731                                 *nistr++ = '\0';
 732
 733                         /* CPT expression (optional) */
 734                         if (*nistr == '[') {
 735                                 elstr = nistr;
 736                                 nistr += strcspn(nistr, "]");
 737                                 if (*nistr != ']') {
 738                                         str = elstr;
 739                                         goto failed_syntax;
 740                                 }
 741                                 rc = cfs_expr_list_parse(elstr,
 742                                                         nistr - elstr + 1,
 743                                                         0, LNET_CPT_NUMBER - 1,
 744                                                         &ni_el);
 745                                 if (rc != 0) {
 746                                         str = elstr;
 747                                         goto failed_syntax;
 748                                 }
 749                                 *elstr = '\0';
 750                                 do {
 751                                         *nistr++ = '\0';
 752                                 } while (isspace(*nistr));
 753                         } else {
 754                                 ni_el = net_el;
 755                         }
 756
 757                         /*
 758                          * End of single interface specificaton,
 759                          * advance to the start of the next one, if
 760                          * any.
 761                          */
 762                         if (*nistr == ',') {
 763                                 do {
 764                                         *nistr++ = '\0';
 765                                 } while (isspace(*nistr));
 766                                 if (!*nistr) {
 767                                         str = nistr;
 768                                         goto failed_syntax;
 769                                 }
 770                         } else if (*nistr) {
 771                                 str = nistr;
 772                                 goto failed_syntax;
 773                         }
 774
 775                         /*
 776                          * At this point the name is properly terminated.
 777                          */
 778                         if (!*name) {
 779                                 str = name;
 780                                 goto failed_syntax;
 781                         }
 782
 783                         ni = lnet_ni_alloc(net, ni_el, name);
 784                         if (IS_ERR_OR_NULL(ni))
 785                                 goto failed;
 786
 787                         if (ni_el) {
 788                                 if (ni_el != net_el) {
 789                                         cfs_expr_list_free(ni_el);
 790                                         ni_el = NULL;
 791                                 }
 792                         }
 793                 } while (*nistr);
 794
 795                 if (net_el) {
 796                         cfs_expr_list_free(net_el);
 797                         net_el = NULL;
 798                 }
 799         } while (*str);
 800
 801         LIBCFS_FREE(tokens, tokensize);
 802         return nnets;
 803
 804  failed_syntax:
 805         lnet_syntax("networks", networks, (int)(str - tokens), strlen(str));
 806  failed:
 807         /* free the net list and all the nis on each net */
 808         while ((net = list_first_entry_or_null(netlist,
 809                                                struct lnet_net,
 810                                                net_list)) != NULL) {
 811                 list_del_init(&net->net_list);
 812                 lnet_net_free(net);
 813         }
 814
 815         if (ni_el && ni_el != net_el)
 816                 cfs_expr_list_free(ni_el);
 817         if (net_el)
 818                 cfs_expr_list_free(net_el);
 819
 820         LIBCFS_FREE(tokens, tokensize);
 821
 822         return -EINVAL;
 823 }
 824
 825 static struct lnet_text_buf *lnet_new_text_buf(int str_len)
 826 {
 827         struct lnet_text_buf *ltb;
 828         int nob;
 829
 830         /* NB allocate space for the terminating 0 */
 831         nob = offsetof(struct lnet_text_buf, ltb_text[str_len + 1]);
 832         if (nob > LNET_SINGLE_TEXTBUF_NOB) {
 833                 /* _way_ conservative for "route net gateway..." */
 834                 CERROR("text buffer too big\n");
 835                 return NULL;
 836         }
 837
 838         if (lnet_tbnob + nob > LNET_MAX_TEXTBUF_NOB) {
 839                 CERROR("Too many text buffers\n");
 840                 return NULL;
 841         }
 842
 843         LIBCFS_ALLOC(ltb, nob);
 844         if (ltb == NULL)
 845                 return NULL;
 846
 847         ltb->ltb_size = nob;
 848         ltb->ltb_text[0] = 0;
 849         lnet_tbnob += nob;
 850         return ltb;
 851 }
 852
 853 static void
 854 lnet_free_text_buf(struct lnet_text_buf *ltb)
 855 {
 856         lnet_tbnob -= ltb->ltb_size;
 857         LIBCFS_FREE(ltb, ltb->ltb_size);
 858 }
 859
 860 static void
 861 lnet_free_text_bufs(struct list_head *tbs)
 862 {
 863         struct lnet_text_buf  *ltb;
 864
 865         while ((ltb = list_first_entry_or_null(tbs, struct lnet_text_buf,
 866                                                ltb_list)) != NULL) {
 867                 list_del(&ltb->ltb_list);
 868                 lnet_free_text_buf(ltb);
 869         }
 870 }
 871
 872 static int
 873 lnet_str2tbs_sep(struct list_head *tbs, const char *str)
 874 {
 875         LIST_HEAD(pending);
 876         const char *sep;
 877         int nob;
 878         int i;
 879         struct lnet_text_buf *ltb;
 880
 881         /* Split 'str' into separate commands */
 882         for (;;) {
 883                 /* skip leading whitespace */
 884                 while (isspace(*str))
 885                         str++;
 886
 887                 /* scan for separator or comment */
 888                 for (sep = str; *sep != 0; sep++)
 889                         if (lnet_issep(*sep) || *sep == '#')
 890                                 break;
 891
 892                 nob = (int)(sep - str);
 893                 if (nob > 0) {
 894                         ltb = lnet_new_text_buf(nob);
 895                         if (ltb == NULL) {
 896                                 lnet_free_text_bufs(&pending);
 897                                 return -ENOMEM;
 898                         }
 899
 900                         for (i = 0; i < nob; i++)
 901                                 if (isspace(str[i]))
 902                                         ltb->ltb_text[i] = ' ';
 903                                 else
 904                                         ltb->ltb_text[i] = str[i];
 905
 906                         ltb->ltb_text[nob] = 0;
 907
 908                         list_add_tail(&ltb->ltb_list, &pending);
 909                 }
 910
 911                 if (*sep == '#') {
 912                         /* scan for separator */
 913                         do {
 914                                 sep++;
 915                         } while (*sep != 0 && !lnet_issep(*sep));
 916                 }
 917
 918                 if (*sep == 0)
 919                         break;
 920
 921                 str = sep + 1;
 922         }
 923
 924         list_splice(&pending, tbs->prev);
 925         return 0;
 926 }
 927
 928 static int
 929 lnet_expand1tb(struct list_head *list,
 930                char *str, char *sep1, char *sep2,
 931                char *item, int itemlen)
 932 {
 933         int              len1 = (int)(sep1 - str);
 934         int              len2 = strlen(sep2 + 1);
 935         struct lnet_text_buf *ltb;
 936
 937         LASSERT (*sep1 == '[');
 938         LASSERT (*sep2 == ']');
 939
 940         ltb = lnet_new_text_buf(len1 + itemlen + len2);
 941         if (ltb == NULL)
 942                 return -ENOMEM;
 943
 944         memcpy(ltb->ltb_text, str, len1);
 945         memcpy(&ltb->ltb_text[len1], item, itemlen);
 946         memcpy(&ltb->ltb_text[len1+itemlen], sep2 + 1, len2);
 947         ltb->ltb_text[len1 + itemlen + len2] = 0;
 948
 949         list_add_tail(&ltb->ltb_list, list);
 950         return 0;
 951 }
 952
 953 static int
 954 lnet_str2tbs_expand(struct list_head *tbs, char *str)
 955 {
 956         char              num[16];
 957         LIST_HEAD(pending);
 958         char             *sep;
 959         char             *sep2;
 960         char             *parsed;
 961         char             *enditem;
 962         int               lo;
 963         int               hi;
 964         int               stride;
 965         int               i;
 966         int               nob;
 967         int               scanned;
 968
 969         sep = strchr(str, '[');
 970         if (sep == NULL)                        /* nothing to expand */
 971                 return 0;
 972
 973         sep2 = strchr(sep, ']');
 974         if (sep2 == NULL)
 975                 goto failed;
 976
 977         for (parsed = sep; parsed < sep2; parsed = enditem) {
 978
 979                 enditem = ++parsed;
 980                 while (enditem < sep2 && *enditem != ',')
 981                         enditem++;
 982
 983                 if (enditem == parsed)          /* no empty items */
 984                         goto failed;
 985
 986                 if (sscanf(parsed, "%d-%d/%d%n", &lo, &hi, &stride, &scanned) < 3) {
 987
 988                         if (sscanf(parsed, "%d-%d%n", &lo, &hi, &scanned) < 2) {
 989
 990                                 /* simple string enumeration */
 991                                 if (lnet_expand1tb(&pending, str, sep, sep2,
 992                                                    parsed, (int)(enditem - parsed)) != 0)
 993                                         goto failed;
 994
 995                                 continue;
 996                         }
 997
 998                         stride = 1;
 999                 }
1000
1001                 /* range expansion */
1002
1003                 if (enditem != parsed + scanned) /* no trailing junk */
1004                         goto failed;
1005
1006                 if (hi < 0 || lo < 0 || stride < 0 || hi < lo ||
1007                     (hi - lo) % stride != 0)
1008                         goto failed;
1009
1010                 for (i = lo; i <= hi; i += stride) {
1011
1012                         snprintf(num, sizeof(num), "%d", i);
1013                         nob = strlen(num);
1014                         if (nob + 1 == sizeof(num))
1015                                 goto failed;
1016
1017                         if (lnet_expand1tb(&pending, str, sep, sep2,
1018                                            num, nob) != 0)
1019                                 goto failed;
1020                 }
1021         }
1022
1023         list_splice(&pending, tbs->prev);
1024         return 1;
1025
1026  failed:
1027         lnet_free_text_bufs(&pending);
1028         return -EINVAL;
1029 }
1030
1031 static int
1032 lnet_parse_hops (char *str, unsigned int *hops)
1033 {
1034         int     len = strlen(str);
1035         int     nob = len;
1036
1037         return (sscanf(str, "%u%n", hops, &nob) >= 1 &&
1038                 nob == len &&
1039                 *hops > 0 && *hops < 256);
1040 }
1041
1042 #define LNET_PRIORITY_SEPARATOR (':')
1043
1044 static int
1045 lnet_parse_priority(char *str, unsigned int *priority, char **token)
1046 {
1047         int   nob;
1048         char *sep;
1049         int   len;
1050
1051         sep = strchr(str, LNET_PRIORITY_SEPARATOR);
1052         if (sep == NULL) {
1053                 *priority = 0;
1054                 return 0;
1055         }
1056         len = strlen(sep + 1);
1057
1058         if ((sscanf((sep+1), "%u%n", priority, &nob) < 1) || (len != nob)) {
1059                 /* Update the caller's token pointer so it treats the found
1060                    priority as the token to report in the error message. */
1061                 *token += sep - str + 1;
1062                 return -EINVAL;
1063         }
1064
1065         CDEBUG(D_NET, "gateway %s, priority %d, nob %d\n", str, *priority, nob);
1066
1067         /*
1068          * Change priority separator to \0 to be able to parse NID
1069          */
1070         *sep = '\0';
1071         return 0;
1072 }
1073
1074 static int
1075 lnet_parse_route(char *str, int *im_a_router)
1076 {
1077         /* static scratch buffer OK (single threaded) */
1078         static char cmd[LNET_SINGLE_TEXTBUF_NOB];
1079
1080         LIST_HEAD(nets);
1081         LIST_HEAD(gateways);
1082         struct list_head *tmp1;
1083         struct list_head *tmp2;
1084         __u32 net;
1085         struct lnet_nid nid;
1086         struct lnet_text_buf *ltb = NULL;
1087         struct lnet_text_buf *ltb1, *ltb2;
1088         int rc;
1089         char *sep;
1090         char *token = str;
1091         int ntokens = 0;
1092         int myrc = -1;
1093         __u32 hops;
1094         int got_hops = 0;
1095         unsigned int priority = 0;
1096
1097         /* save a copy of the string for error messages */
1098         strncpy(cmd, str, sizeof(cmd));
1099         cmd[sizeof(cmd) - 1] = '\0';
1100
1101         sep = str;
1102         for (;;) {
1103                 /* scan for token start */
1104                 while (isspace(*sep))
1105                         sep++;
1106                 if (*sep == 0) {
1107                         if (ntokens < (got_hops ? 3 : 2))
1108                                 goto token_error;
1109                         break;
1110                 }
1111
1112                 ntokens++;
1113                 token = sep++;
1114
1115                 /* scan for token end */
1116                 while (*sep != 0 && !isspace(*sep))
1117                         sep++;
1118                 if (*sep != 0)
1119                         *sep++ = 0;
1120
1121                 if (ntokens == 1) {
1122                         tmp2 = &nets;           /* expanding nets */
1123                 } else if (ntokens == 2 &&
1124                            lnet_parse_hops(token, &hops)) {
1125                         got_hops = 1;           /* got a hop count */
1126                         continue;
1127                 } else {
1128                         tmp2 = &gateways;       /* expanding gateways */
1129                 }
1130
1131                 ltb = lnet_new_text_buf(strlen(token));
1132                 if (ltb == NULL)
1133                         goto out;
1134
1135                 strcpy(ltb->ltb_text, token);
1136                 tmp1 = &ltb->ltb_list;
1137                 list_add_tail(tmp1, tmp2);
1138
1139                 while (tmp1 != tmp2) {
1140                         ltb = list_entry(tmp1, struct lnet_text_buf, ltb_list);
1141
1142                         rc = lnet_str2tbs_expand(tmp1->next, ltb->ltb_text);
1143                         if (rc < 0)
1144                                 goto token_error;
1145
1146                         tmp1 = tmp1->next;
1147
1148                         if (rc > 0) {           /* expanded! */
1149                                 list_del(&ltb->ltb_list);
1150                                 lnet_free_text_buf(ltb);
1151                                 continue;
1152                         }
1153
1154                         if (ntokens == 1) {
1155                                 net = libcfs_str2net(ltb->ltb_text);
1156                                 if (net == LNET_NET_ANY ||
1157                                     LNET_NETTYP(net) == LOLND)
1158                                         goto token_error;
1159                         } else {
1160                                 rc = lnet_parse_priority(ltb->ltb_text,
1161                                                          &priority, &token);
1162                                 if (rc < 0)
1163                                         goto token_error;
1164
1165                                 if (libcfs_strnid(&nid, ltb->ltb_text) != 0 ||
1166                                     nid_is_lo0(&nid))
1167                                         goto token_error;
1168                         }
1169                 }
1170         }
1171
1172         /* if there are no hops set then we want to flag this value as
1173          * unset since hops is an optional parameter */
1174         if (!got_hops)
1175                 hops = LNET_UNDEFINED_HOPS;
1176
1177         LASSERT(!list_empty(&nets));
1178         LASSERT(!list_empty(&gateways));
1179
1180         list_for_each_entry(ltb1, &nets, ltb_list) {
1181                 net = libcfs_str2net(ltb1->ltb_text);
1182                 LASSERT(net != LNET_NET_ANY);
1183
1184                 list_for_each_entry(ltb2, &gateways, ltb_list) {
1185                         LASSERT(libcfs_strnid(&nid, ltb->ltb_text) == 0);
1186
1187                         if (lnet_islocalnid(&nid)) {
1188                                 *im_a_router = 1;
1189                                 continue;
1190                         }
1191
1192                         rc = lnet_add_route(net, hops, &nid, priority, 1);
1193                         if (rc != 0 && rc != -EEXIST && rc != -EHOSTUNREACH) {
1194                                 CERROR("Can't create route "
1195                                        "to %s via %s\n",
1196                                        libcfs_net2str(net),
1197                                        libcfs_nidstr(&nid));
1198                                 goto out;
1199                         }
1200                 }
1201         }
1202
1203         myrc = 0;
1204         goto out;
1205
1206 token_error:
1207         lnet_syntax("routes", cmd, (int)(token - str), strlen(token));
1208 out:
1209         lnet_free_text_bufs(&nets);
1210         lnet_free_text_bufs(&gateways);
1211         return myrc;
1212 }
1213
1214 static int
1215 lnet_parse_route_tbs(struct list_head *tbs, int *im_a_router)
1216 {
1217         struct lnet_text_buf *ltb;
1218
1219         while ((ltb = list_first_entry_or_null(tbs, struct lnet_text_buf,
1220                                                ltb_list)) != NULL) {
1221                 if (lnet_parse_route(ltb->ltb_text, im_a_router) < 0) {
1222                         lnet_free_text_bufs(tbs);
1223                         return -EINVAL;
1224                 }
1225
1226                 list_del(&ltb->ltb_list);
1227                 lnet_free_text_buf(ltb);
1228         }
1229
1230         return 0;
1231 }
1232
1233 int
1234 lnet_parse_routes(const char *routes, int *im_a_router)
1235 {
1236         LIST_HEAD(tbs);
1237         int rc = 0;
1238
1239         *im_a_router = 0;
1240
1241         if (lnet_str2tbs_sep(&tbs, routes) < 0) {
1242                 CERROR("Error parsing routes\n");
1243                 rc = -EINVAL;
1244         } else {
1245                 rc = lnet_parse_route_tbs(&tbs, im_a_router);
1246         }
1247
1248         LASSERT (lnet_tbnob == 0);
1249         return rc;
1250 }
1251
1252 static int
1253 lnet_match_network_token(char *token, int len, __u32 *ipaddrs, int nip)
1254 {
1255         LIST_HEAD(list);
1256         int             rc;
1257         int             i;
1258
1259         rc = cfs_ip_addr_parse(token, len, &list);
1260         if (rc != 0)
1261                 return rc;
1262
1263         for (rc = i = 0; !rc && i < nip; i++)
1264                 rc = cfs_ip_addr_match(ipaddrs[i], &list);
1265
1266         cfs_expr_list_free_list(&list);
1267
1268         return rc;
1269 }
1270
1271 static int
1272 lnet_match_network_tokens(char *net_entry, __u32 *ipaddrs, int nip)
1273 {
1274         static char tokens[LNET_SINGLE_TEXTBUF_NOB];
1275
1276         int   matched = 0;
1277         int   ntokens = 0;
1278         int   len;
1279         char *net = NULL;
1280         char *sep;
1281         char *token;
1282         int   rc;
1283
1284         LASSERT(strlen(net_entry) < sizeof(tokens));
1285
1286         /* work on a copy of the string */
1287         strcpy(tokens, net_entry);
1288         sep = tokens;
1289         for (;;) {
1290                 /* scan for token start */
1291                 while (isspace(*sep))
1292                         sep++;
1293                 if (*sep == 0)
1294                         break;
1295
1296                 token = sep++;
1297
1298                 /* scan for token end */
1299                 while (*sep != 0 && !isspace(*sep))
1300                         sep++;
1301                 if (*sep != 0)
1302                         *sep++ = 0;
1303
1304                 if (ntokens++ == 0) {
1305                         net = token;
1306                         continue;
1307                 }
1308
1309                 len = strlen(token);
1310
1311                 rc = lnet_match_network_token(token, len, ipaddrs, nip);
1312                 if (rc < 0) {
1313                         lnet_syntax("ip2nets", net_entry,
1314                                     (int)(token - tokens), len);
1315                         return rc;
1316                 }
1317
1318                 matched |= (rc != 0);
1319         }
1320
1321         if (!matched)
1322                 return 0;
1323
1324         strcpy(net_entry, net);                 /* replace with matched net */
1325         return 1;
1326 }
1327
1328 static __u32
1329 lnet_netspec2net(char *netspec)
1330 {
1331         char   *bracket = strchr(netspec, '(');
1332         __u32   net;
1333
1334         if (bracket != NULL)
1335                 *bracket = 0;
1336
1337         net = libcfs_str2net(netspec);
1338
1339         if (bracket != NULL)
1340                 *bracket = '(';
1341
1342         return net;
1343 }
1344
1345 static int
1346 lnet_splitnets(char *source, struct list_head *nets)
1347 {
1348         int               offset = 0;
1349         int               offset2;
1350         int               len;
1351         struct lnet_text_buf  *tb;
1352         struct lnet_text_buf  *tb2;
1353         char             *sep;
1354         char             *bracket;
1355         __u32             net;
1356
1357         LASSERT(!list_empty(nets));
1358         LASSERT(nets->next == nets->prev);      /* single entry */
1359
1360         tb = list_first_entry(nets, struct lnet_text_buf, ltb_list);
1361
1362         for (;;) {
1363                 sep = strchr(tb->ltb_text, ',');
1364                 bracket = strchr(tb->ltb_text, '(');
1365
1366                 if (sep != NULL &&
1367                     bracket != NULL &&
1368                     bracket < sep) {
1369                         /* netspec lists interfaces... */
1370
1371                         offset2 = offset + (int)(bracket - tb->ltb_text);
1372                         len = strlen(bracket);
1373
1374                         bracket = strchr(bracket + 1, ')');
1375
1376                         if (bracket == NULL ||
1377                             !(bracket[1] == ',' || bracket[1] == 0)) {
1378                                 lnet_syntax("ip2nets", source, offset2, len);
1379                                 return -EINVAL;
1380                         }
1381
1382                         sep = (bracket[1] == 0) ? NULL : bracket + 1;
1383                 }
1384
1385                 if (sep != NULL)
1386                         *sep++ = 0;
1387
1388                 net = lnet_netspec2net(tb->ltb_text);
1389                 if (net == LNET_NET_ANY) {
1390                         lnet_syntax("ip2nets", source, offset,
1391                                     strlen(tb->ltb_text));
1392                         return -EINVAL;
1393                 }
1394
1395                 list_for_each_entry(tb2, nets, ltb_list) {
1396                         if (tb2 == tb)
1397                                 continue;
1398
1399                         if (net == lnet_netspec2net(tb2->ltb_text)) {
1400                                 /* duplicate network */
1401                                 lnet_syntax("ip2nets", source, offset,
1402                                             strlen(tb->ltb_text));
1403                                 return -EINVAL;
1404                         }
1405                 }
1406
1407                 if (sep == NULL)
1408                         return 0;
1409
1410                 offset += (int)(sep - tb->ltb_text);
1411                 len = strlen(sep);
1412                 tb2 = lnet_new_text_buf(len);
1413                 if (tb2 == NULL)
1414                         return -ENOMEM;
1415
1416                 strncpy(tb2->ltb_text, sep, len);
1417                 tb2->ltb_text[len] = '\0';
1418                 list_add_tail(&tb2->ltb_list, nets);
1419
1420                 tb = tb2;
1421         }
1422 }
1423
1424 static int
1425 lnet_match_networks(const char **networksp, const char *ip2nets,
1426                     __u32 *ipaddrs, int nip)
1427 {
1428         static char       networks[LNET_SINGLE_TEXTBUF_NOB];
1429         static char       source[LNET_SINGLE_TEXTBUF_NOB];
1430
1431         LIST_HEAD(raw_entries);
1432         LIST_HEAD(matched_nets);
1433         LIST_HEAD(current_nets);
1434         struct list_head *t;
1435         struct list_head *t2;
1436         struct lnet_text_buf  *tb;
1437         int               len;
1438         int               count;
1439         int               rc;
1440
1441         if (lnet_str2tbs_sep(&raw_entries, ip2nets) < 0) {
1442                 CERROR("Error parsing ip2nets\n");
1443                 LASSERT(lnet_tbnob == 0);
1444                 return -EINVAL;
1445         }
1446
1447         networks[0] = 0;
1448         count = 0;
1449         len = 0;
1450         rc = 0;
1451
1452         while ((tb = list_first_entry_or_null(&raw_entries,
1453                                               struct lnet_text_buf,
1454                                               ltb_list)) != NULL) {
1455                 strncpy(source, tb->ltb_text, sizeof(source));
1456                 source[sizeof(source) - 1] = '\0';
1457
1458                 /* replace ltb_text with the network(s) add on match */
1459                 rc = lnet_match_network_tokens(tb->ltb_text, ipaddrs, nip);
1460                 if (rc < 0)
1461                         break;
1462
1463                 list_del(&tb->ltb_list);
1464
1465                 if (rc == 0) {                  /* no match */
1466                         lnet_free_text_buf(tb);
1467                         continue;
1468                 }
1469
1470                 /* split into separate networks */
1471                 INIT_LIST_HEAD(&current_nets);
1472                 list_add(&tb->ltb_list, &current_nets);
1473                 rc = lnet_splitnets(source, &current_nets);
1474                 if (rc < 0)
1475                         break;
1476
1477                 list_for_each_safe(t, t2, &current_nets) {
1478                         tb = list_entry(t, struct lnet_text_buf, ltb_list);
1479
1480                         list_move_tail(&tb->ltb_list, &matched_nets);
1481
1482                         len += scnprintf(networks + len, sizeof(networks) - len,
1483                                          "%s%s", (len == 0) ? "" : ",",
1484                                          tb->ltb_text);
1485
1486                         if (len >= sizeof(networks)) {
1487                                 CERROR("Too many matched networks\n");
1488                                 rc = -E2BIG;
1489                                 goto out;
1490                         }
1491                 }
1492
1493                 count++;
1494         }
1495
1496  out:
1497         lnet_free_text_bufs(&raw_entries);
1498         lnet_free_text_bufs(&matched_nets);
1499         lnet_free_text_bufs(&current_nets);
1500         LASSERT(lnet_tbnob == 0);
1501
1502         if (rc < 0)
1503                 return rc;
1504
1505         *networksp = networks;
1506         return count;
1507 }
1508
1509 int lnet_inet_enumerate(struct lnet_inetdev **dev_list, struct net *ns, bool v6)
1510 {
1511         struct lnet_inetdev *ifaces = NULL;
1512         struct net_device *dev;
1513         int nalloc = 0;
1514         int nip = 0;
1515         DECLARE_CONST_IN_IFADDR(ifa);
1516
1517         rtnl_lock();
1518         for_each_netdev(ns, dev) {
1519                 int flags = dev_get_flags(dev);
1520                 struct in_device *in_dev;
1521                 struct inet6_dev *in6_dev;
1522                 const struct inet6_ifaddr *ifa6;
1523                 int node_id;
1524                 int cpt;
1525
1526                 if (flags & IFF_LOOPBACK) /* skip the loopback IF */
1527                         continue;
1528
1529                 if (!(flags & IFF_UP)) {
1530                         CWARN("lnet: Ignoring interface %s: it's down\n",
1531                               dev->name);
1532                         continue;
1533                 }
1534
1535                 node_id = dev_to_node(&dev->dev);
1536                 cpt = cfs_cpt_of_node(lnet_cpt_table(), node_id);
1537
1538                 in_dev = __in_dev_get_rtnl(dev);
1539                 if (!in_dev) {
1540                         if (!v6)
1541                                 CWARN("lnet: Interface %s has no IPv4 status.\n",
1542                                       dev->name);
1543                         goto try_v6;
1544                 }
1545
1546                 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1547                         if (nip >= nalloc) {
1548                                 struct lnet_inetdev *tmp;
1549
1550                                 nalloc += LNET_INTERFACES_NUM;
1551                                 tmp = krealloc(ifaces, nalloc * sizeof(*tmp),
1552                                                GFP_KERNEL);
1553                                 if (!tmp) {
1554                                         kfree(ifaces);
1555                                         ifaces = NULL;
1556                                         nip = -ENOMEM;
1557                                         goto unlock_rtnl;
1558                                 }
1559                                 ifaces = tmp;
1560                         }
1561
1562                         ifaces[nip].li_cpt = cpt;
1563                         ifaces[nip].li_iff_master = !!(flags & IFF_MASTER);
1564                         ifaces[nip].li_ipv6 = false;
1565                         ifaces[nip].li_index = dev->ifindex;
1566                         ifaces[nip].li_ipaddr = ntohl(ifa->ifa_local);
1567                         ifaces[nip].li_netmask = ntohl(ifa->ifa_mask);
1568                         strlcpy(ifaces[nip].li_name, ifa->ifa_label,
1569                                 sizeof(ifaces[nip].li_name));
1570                         nip++;
1571                 }
1572                 endfor_ifa(in_dev);
1573
1574         try_v6:
1575                 if (!v6)
1576                         continue;
1577 #if IS_ENABLED(CONFIG_IPV6)
1578                 in6_dev = __in6_dev_get(dev);
1579                 if (!in6_dev) {
1580                         if (!in_dev)
1581                                 CWARN("lnet: Interface %s has no IP status.\n",
1582                                       dev->name);
1583                         continue;
1584                 }
1585
1586                 list_for_each_entry_rcu(ifa6, &in6_dev->addr_list, if_list) {
1587                         if (ifa6->flags & IFA_F_TEMPORARY)
1588                                 continue;
1589                         if (nip >= nalloc) {
1590                                 struct lnet_inetdev *tmp;
1591
1592                                 nalloc += LNET_INTERFACES_NUM;
1593                                 tmp = krealloc(ifaces, nalloc * sizeof(*tmp),
1594                                                GFP_KERNEL);
1595                                 if (!tmp) {
1596                                         kfree(ifaces);
1597                                         ifaces = NULL;
1598                                         nip = -ENOMEM;
1599                                         goto unlock_rtnl;
1600                                 }
1601                                 ifaces = tmp;
1602                         }
1603
1604                         ifaces[nip].li_cpt = cpt;
1605                         ifaces[nip].li_iff_master = !!(flags & IFF_MASTER);
1606                         ifaces[nip].li_ipv6 = true;
1607                         ifaces[nip].li_index = dev->ifindex;
1608                         memcpy(ifaces[nip].li_ipv6addr,
1609                                &ifa6->addr, sizeof(struct in6_addr));
1610                         strlcpy(ifaces[nip].li_name, dev->name,
1611                                 sizeof(ifaces[nip].li_name));
1612                         nip++;
1613                         /* As different IPv6 addresses don't have unique
1614                          * labels, it is safest just to use the first
1615                          * and ignore the rest.
1616                          */
1617                         break;
1618                 }
1619 #endif /* IS_ENABLED(CONFIG_IPV6) */
1620
1621         }
1622 unlock_rtnl:
1623         rtnl_unlock();
1624
1625         if (nip == 0) {
1626                 CERROR("lnet: Can't find any usable interfaces, rc = -ENOENT\n");
1627                 nip = -ENOENT;
1628         }
1629
1630         *dev_list = ifaces;
1631         return nip;
1632 }
1633 EXPORT_SYMBOL(lnet_inet_enumerate);
1634
1635 int
1636 lnet_parse_ip2nets(const char **networksp, const char *ip2nets)
1637 {
1638         struct lnet_inetdev *ifaces = NULL;
1639         __u32     *ipaddrs = NULL;
1640         int nip;
1641         int        rc;
1642         int i;
1643
1644         if (current->nsproxy && current->nsproxy->net_ns)
1645                 nip = lnet_inet_enumerate(&ifaces, current->nsproxy->net_ns,
1646                                           false);
1647         else
1648                 nip = lnet_inet_enumerate(&ifaces, &init_net, false);
1649         if (nip < 0) {
1650                 if (nip != -ENOENT) {
1651                         LCONSOLE_ERROR_MSG(0x117,
1652                                            "Error %d enumerating local IP interfaces for ip2nets to match\n",
1653                                            nip);
1654                 } else {
1655                         LCONSOLE_ERROR_MSG(0x118,
1656                                            "No local IP interfaces for ip2nets to match\n");
1657                 }
1658                 return nip;
1659         }
1660
1661         CFS_ALLOC_PTR_ARRAY(ipaddrs, nip);
1662         if (!ipaddrs) {
1663                 rc = -ENOMEM;
1664                 CERROR("lnet: Can't allocate ipaddrs[%d], rc = %d\n",
1665                        nip, rc);
1666                 goto out_free_addrs;
1667         }
1668
1669         for (i = 0; i < nip; i++)
1670                 ipaddrs[i] = ifaces[i].li_ipaddr;
1671
1672         rc = lnet_match_networks(networksp, ip2nets, ipaddrs, nip);
1673         if (rc < 0) {
1674                 LCONSOLE_ERROR_MSG(0x119, "Error %d parsing ip2nets\n", rc);
1675         } else if (rc == 0) {
1676                 LCONSOLE_ERROR_MSG(0x11a, "ip2nets does not match "
1677                                    "any local IP interfaces\n");
1678                 rc = -ENOENT;
1679         }
1680         CFS_FREE_PTR_ARRAY(ipaddrs, nip);
1681 out_free_addrs:
1682         kfree(ifaces);
1683         return rc > 0 ? 0 : rc;
1684 }