proto.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  * Copyright (C) 2012 Steven Barth <steven@midlink.org>
   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
   8  * as published by the Free Software Foundation
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #include <string.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <limits.h>
  19
  20 #include <arpa/inet.h>
  21 #include <netinet/in.h>
  22
  23 #include "netifd.h"
  24 #include "system.h"
  25 #include "interface.h"
  26 #include "interface-ip.h"
  27 #include "proto.h"
  28
  29 static struct avl_tree handlers;
  30
  31 enum {
  32         OPT_IPADDR,
  33         OPT_IP6ADDR,
  34         OPT_NETMASK,
  35         OPT_BROADCAST,
  36         OPT_PTPADDR,
  37         OPT_GATEWAY,
  38         OPT_IP6GW,
  39         OPT_IP6PREFIX,
  40         OPT_IP6DEPRECATED,
  41         __OPT_MAX,
  42 };
  43
  44 static const struct blobmsg_policy proto_ip_attributes[__OPT_MAX] = {
  45         [OPT_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_ARRAY },
  46         [OPT_IP6ADDR] = { .name = "ip6addr", .type = BLOBMSG_TYPE_ARRAY },
  47         [OPT_NETMASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  48         [OPT_BROADCAST] = { .name = "broadcast", .type = BLOBMSG_TYPE_STRING },
  49         [OPT_PTPADDR] = { .name = "ptpaddr", .type = BLOBMSG_TYPE_STRING },
  50         [OPT_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  51         [OPT_IP6GW] = { .name = "ip6gw", .type = BLOBMSG_TYPE_STRING },
  52         [OPT_IP6PREFIX] = { .name = "ip6prefix", .type = BLOBMSG_TYPE_ARRAY },
  53         [OPT_IP6DEPRECATED] = { .name = "ip6deprecated", .type = BLOBMSG_TYPE_BOOL },
  54 };
  55
  56 static const struct uci_blob_param_info proto_ip_attr_info[__OPT_MAX] = {
  57         [OPT_IPADDR] = { .type = BLOBMSG_TYPE_STRING },
  58         [OPT_IP6ADDR] = { .type = BLOBMSG_TYPE_STRING },
  59         [OPT_IP6PREFIX] = { .type = BLOBMSG_TYPE_STRING },
  60 };
  61
  62 static const char * const proto_ip_validate[__OPT_MAX] = {
  63         [OPT_IPADDR] = "ip4addr",
  64         [OPT_IP6ADDR] = "ip6addr",
  65         [OPT_NETMASK] = "netmask",
  66         [OPT_BROADCAST] = "ipaddr",
  67         [OPT_PTPADDR] = "ip4addr",
  68         [OPT_GATEWAY] = "ip4addr",
  69         [OPT_IP6GW] = "ip6addr",
  70         [OPT_IP6PREFIX] = "ip6addr",
  71 };
  72
  73 const struct uci_blob_param_list proto_ip_attr = {
  74         .n_params = __OPT_MAX,
  75         .params = proto_ip_attributes,
  76         .validate = proto_ip_validate,
  77         .info = proto_ip_attr_info,
  78 };
  79
  80 enum {
  81         ADDR_IPADDR,
  82         ADDR_MASK,
  83         ADDR_BROADCAST,
  84         ADDR_PTP,
  85         ADDR_PREFERRED,
  86         ADDR_VALID,
  87         ADDR_OFFLINK,
  88         ADDR_CLASS,
  89         __ADDR_MAX
  90 };
  91
  92 static const struct blobmsg_policy proto_ip_addr[__ADDR_MAX] = {
  93         [ADDR_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING },
  94         [ADDR_MASK] = { .name = "mask", .type = BLOBMSG_TYPE_STRING },
  95         [ADDR_BROADCAST] = { .name = "broadcast", .type = BLOBMSG_TYPE_STRING },
  96         [ADDR_PTP] = { .name = "ptp", .type = BLOBMSG_TYPE_STRING },
  97         [ADDR_PREFERRED] = { .name = "preferred", .type = BLOBMSG_TYPE_INT32 },
  98         [ADDR_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  99         [ADDR_OFFLINK] = { .name = "offlink", .type = BLOBMSG_TYPE_BOOL },
 100         [ADDR_CLASS] = { .name = "class", .type = BLOBMSG_TYPE_STRING },
 101 };
 102
 103 static struct device_addr *
 104 alloc_device_addr(bool v6, bool ext)
 105 {
 106         struct device_addr *addr;
 107
 108         addr = calloc(1, sizeof(*addr));
 109         if (!addr)
 110                 return NULL;
 111
 112         addr->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 113         if (ext)
 114                 addr->flags |= DEVADDR_EXTERNAL;
 115
 116         return addr;
 117 }
 118
 119 static struct device_addr *
 120 parse_addr(const char *str, bool v6, int mask, bool ext, uint32_t broadcast,
 121                 uint32_t ptp, bool deprecated)
 122 {
 123         struct device_addr *addr;
 124         int af = v6 ? AF_INET6 : AF_INET;
 125
 126         addr = alloc_device_addr(v6, ext);
 127         if (!addr)
 128                 return NULL;
 129
 130         addr->mask = mask;
 131         if (!parse_ip_and_netmask(af, str, &addr->addr, &addr->mask))
 132                 goto error;
 133
 134         if (v6 && IN6_IS_ADDR_MULTICAST(&addr->addr.in6))
 135                 goto error;
 136
 137         if (broadcast)
 138                 addr->broadcast = broadcast;
 139
 140         if (ptp)
 141                 addr->point_to_point = ptp;
 142
 143         if (deprecated)
 144                 addr->preferred_until = system_get_rtime();
 145
 146         return addr;
 147
 148 error:
 149         free(addr);
 150
 151         return NULL;
 152 }
 153
 154 static int
 155 parse_static_address_option(struct interface *iface, struct blob_attr *attr,
 156                             bool v6, int netmask, bool ext, uint32_t broadcast,
 157                             uint32_t ptp, bool deprecated)
 158 {
 159         struct blob_attr *cur;
 160         struct device_addr *addr;
 161         const char *str;
 162         int n_addr = 0;
 163         int rem;
 164
 165         blobmsg_for_each_attr(cur, attr, rem) {
 166                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 167                         return -1;
 168
 169                 str = blobmsg_data(cur);
 170                 addr = parse_addr(str, v6, netmask, ext, broadcast, ptp, deprecated);
 171                 if (addr == NULL) {
 172                         interface_add_error(iface, "proto", "INVALID_ADDRESS", &str, 1);
 173                         return -1;
 174                 }
 175                 addr->index = n_addr;
 176                 n_addr++;
 177                 vlist_add(&iface->proto_ip.addr, &addr->node, addr);
 178         }
 179
 180         return n_addr;
 181 }
 182
 183 static struct device_addr *
 184 parse_address_item(struct blob_attr *attr, bool v6, bool ext)
 185 {
 186         struct device_addr *addr;
 187         struct blob_attr *tb[__ADDR_MAX];
 188         struct blob_attr *cur;
 189
 190         if (blobmsg_type(attr) != BLOBMSG_TYPE_TABLE)
 191                 return NULL;
 192
 193         addr = alloc_device_addr(v6, ext);
 194         if (!addr)
 195                 return NULL;
 196
 197         blobmsg_parse(proto_ip_addr, __ADDR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 198
 199         addr->mask = v6 ? 128 : 32;
 200         if ((cur = tb[ADDR_MASK])) {
 201                 unsigned int new_mask;
 202
 203                 new_mask = parse_netmask_string(blobmsg_data(cur), v6);
 204                 if (new_mask > addr->mask)
 205                         goto error;
 206
 207                 addr->mask = new_mask;
 208         }
 209
 210         cur = tb[ADDR_IPADDR];
 211         if (!cur)
 212                 goto error;
 213
 214         if (!inet_pton(v6 ? AF_INET6 : AF_INET, blobmsg_data(cur), &addr->addr))
 215                 goto error;
 216
 217         if ((cur = tb[ADDR_OFFLINK]) && blobmsg_get_bool(cur))
 218                 addr->flags |= DEVADDR_OFFLINK;
 219
 220         if (!v6) {
 221                 if ((cur = tb[ADDR_BROADCAST]) &&
 222                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->broadcast))
 223                         goto error;
 224                 if ((cur = tb[ADDR_PTP]) &&
 225                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->point_to_point))
 226                         goto error;
 227         } else {
 228                 time_t now = system_get_rtime();
 229                 if ((cur = tb[ADDR_PREFERRED])) {
 230                         int64_t preferred = blobmsg_get_u32(cur);
 231                         int64_t preferred_until = preferred + (int64_t)now;
 232                         if (preferred_until <= LONG_MAX && preferred != 0xffffffffLL)
 233                                 addr->preferred_until = preferred_until;
 234                 }
 235
 236                 if ((cur = tb[ADDR_VALID])) {
 237                         int64_t valid = blobmsg_get_u32(cur);
 238                         int64_t valid_until = valid + (int64_t)now;
 239                         if (valid_until <= LONG_MAX && valid != 0xffffffffLL)
 240                                 addr->valid_until = valid_until;
 241
 242                 }
 243
 244                 if (addr->valid_until) {
 245                         if (!addr->preferred_until)
 246                                 addr->preferred_until = addr->valid_until;
 247                         else if (addr->preferred_until > addr->valid_until)
 248                                 goto error;
 249                 }
 250
 251                 if ((cur = tb[ADDR_CLASS]))
 252                         addr->pclass = strdup(blobmsg_get_string(cur));
 253         }
 254
 255         return addr;
 256
 257 error:
 258         free(addr);
 259         return NULL;
 260 }
 261
 262 static int
 263 parse_address_list(struct interface *iface, struct blob_attr *attr, bool v6,
 264                    bool ext)
 265 {
 266         struct device_addr *addr;
 267         struct blob_attr *cur;
 268         int n_addr = 0;
 269         int rem;
 270
 271         blobmsg_for_each_attr(cur, attr, rem) {
 272                 addr = parse_address_item(cur, v6, ext);
 273                 if (!addr)
 274                         return -1;
 275
 276                 addr->index = n_addr;
 277                 n_addr++;
 278                 vlist_add(&iface->proto_ip.addr, &addr->node, addr);
 279         }
 280
 281         return n_addr;
 282 }
 283
 284 static bool
 285 parse_gateway_option(struct interface *iface, struct blob_attr *attr, bool v6)
 286 {
 287         struct device_route *route;
 288         const char *str = blobmsg_data(attr);
 289         int af = v6 ? AF_INET6 : AF_INET;
 290
 291         route = calloc(1, sizeof(*route));
 292         if (!route)
 293                 return NULL;
 294
 295         if (!inet_pton(af, str, &route->nexthop)) {
 296                 interface_add_error(iface, "proto", "INVALID_GATEWAY", &str, 1);
 297                 free(route);
 298                 return false;
 299         }
 300
 301         route->mask = 0;
 302         route->flags = (v6 ? DEVADDR_INET6 : DEVADDR_INET4);
 303         route->metric = iface->metric;
 304
 305         unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
 306         if (table) {
 307                 route->table = table;
 308                 route->flags |= DEVROUTE_SRCTABLE;
 309         }
 310
 311         vlist_add(&iface->proto_ip.route, &route->node, route);
 312
 313         return true;
 314 }
 315
 316 static bool
 317 parse_prefix_option(struct interface *iface, const char *str, size_t len)
 318 {
 319         char buf[128] = {0}, *saveptr;
 320         if (len >= sizeof(buf))
 321                 return false;
 322
 323         memcpy(buf, str, len);
 324         char *addrstr = strtok_r(buf, "/", &saveptr);
 325         if (!addrstr)
 326                 return false;
 327
 328         char *lengthstr = strtok_r(NULL, ",", &saveptr);
 329         if (!lengthstr)
 330                 return false;
 331
 332         char *prefstr = strtok_r(NULL, ",", &saveptr);
 333         char *validstr = (!prefstr) ? NULL : strtok_r(NULL, ",", &saveptr);
 334         char *addstr = (!validstr) ? NULL : strtok_r(NULL, ",", &saveptr);
 335         const char *pclass = NULL;
 336
 337         int64_t pref = (!prefstr) ? 0 : strtoul(prefstr, NULL, 10);
 338         int64_t valid = (!validstr) ? 0 : strtoul(validstr, NULL, 10);
 339
 340         uint8_t length = strtoul(lengthstr, NULL, 10), excl_length = 0;
 341         if (length < 1 || length > 64)
 342                 return false;
 343
 344         struct in6_addr addr, excluded, *excludedp = NULL;
 345         if (inet_pton(AF_INET6, addrstr, &addr) < 1)
 346                 return false;
 347
 348         for (; addstr; addstr = strtok_r(NULL, ",", &saveptr)) {
 349                 char *key = NULL, *val = NULL, *addsaveptr;
 350                 if (!(key = strtok_r(addstr, "=", &addsaveptr)) ||
 351                                 !(val = strtok_r(NULL, ",", &addsaveptr)))
 352                         continue;
 353
 354                 if (!strcmp(key, "excluded")) {
 355                         char *sep = strchr(val, '/');
 356                         if (!sep)
 357                                 return false;
 358
 359                         *sep = 0;
 360                         excl_length = atoi(sep + 1);
 361
 362                         if (inet_pton(AF_INET6, val, &excluded) < 1)
 363                                 return false;
 364
 365                         excludedp = &excluded;
 366                 } else if (!strcmp(key, "class")) {
 367                         pclass = val;
 368                 }
 369
 370         }
 371
 372
 373
 374
 375         int64_t now = system_get_rtime();
 376         time_t preferred_until = 0;
 377         if (prefstr && pref != 0xffffffffLL && pref + now <= LONG_MAX)
 378                 preferred_until = pref + now;
 379
 380         time_t valid_until = 0;
 381         if (validstr && valid != 0xffffffffLL && valid + now <= LONG_MAX)
 382                 valid_until = valid + now;
 383
 384         interface_ip_add_device_prefix(iface, &addr, length,
 385                         valid_until, preferred_until,
 386                         excludedp, excl_length, pclass);
 387         return true;
 388 }
 389
 390 static int
 391 parse_prefix_list(struct interface *iface, struct blob_attr *attr)
 392 {
 393         struct blob_attr *cur;
 394         int n_addr = 0;
 395         int rem;
 396
 397         blobmsg_for_each_attr(cur, attr, rem) {
 398                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 399                         return -1;
 400
 401                 n_addr++;
 402                 if (!parse_prefix_option(iface, blobmsg_data(cur),
 403                                 blobmsg_data_len(cur)))
 404                         return -1;
 405         }
 406
 407         return n_addr;
 408 }
 409
 410 int
 411 proto_apply_static_ip_settings(struct interface *iface, struct blob_attr *attr)
 412 {
 413         struct blob_attr *tb[__OPT_MAX];
 414         struct blob_attr *cur;
 415         const char *error;
 416         unsigned int netmask = 32;
 417         bool ip6deprecated;
 418         int n_v4 = 0, n_v6 = 0;
 419         struct in_addr bcast = {}, ptp = {};
 420
 421         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 422
 423         if ((cur = tb[OPT_NETMASK])) {
 424                 netmask = parse_netmask_string(blobmsg_data(cur), false);
 425                 if (netmask > 32) {
 426                         error = "INVALID_NETMASK";
 427                         goto error;
 428                 }
 429         }
 430
 431         if ((cur = tb[OPT_BROADCAST])) {
 432                 if (!inet_pton(AF_INET, blobmsg_data(cur), &bcast)) {
 433                         error = "INVALID_BROADCAST";
 434                         goto error;
 435                 }
 436         }
 437
 438         if ((cur = tb[OPT_PTPADDR])) {
 439                 if (!inet_pton(AF_INET, blobmsg_data(cur), &ptp)) {
 440                         error = "INVALID_PTPADDR";
 441                         goto error;
 442                 }
 443         }
 444
 445         ip6deprecated = blobmsg_get_bool_default(tb[OPT_IP6DEPRECATED], false);
 446
 447         if ((cur = tb[OPT_IPADDR]))
 448                 n_v4 = parse_static_address_option(iface, cur, false,
 449                         netmask, false, bcast.s_addr, ptp.s_addr, false);
 450
 451         if ((cur = tb[OPT_IP6ADDR]))
 452                 n_v6 = parse_static_address_option(iface, cur, true,
 453                         128, false, 0, 0, ip6deprecated);
 454
 455         if ((cur = tb[OPT_IP6PREFIX]))
 456                 if (parse_prefix_list(iface, cur) < 0)
 457                         goto out;
 458
 459         if (n_v4 < 0 || n_v6 < 0)
 460                 goto out;
 461
 462         if ((cur = tb[OPT_GATEWAY])) {
 463                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 464                         goto out;
 465         }
 466
 467         if ((cur = tb[OPT_IP6GW])) {
 468                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 469                         goto out;
 470         }
 471
 472         return 0;
 473
 474 error:
 475         interface_add_error(iface, "proto", error, NULL, 0);
 476 out:
 477         return -1;
 478 }
 479
 480 int
 481 proto_apply_ip_settings(struct interface *iface, struct blob_attr *attr, bool ext)
 482 {
 483         struct blob_attr *tb[__OPT_MAX];
 484         struct blob_attr *cur;
 485         int n_v4 = 0, n_v6 = 0;
 486
 487         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 488
 489         if ((cur = tb[OPT_IPADDR]))
 490                 n_v4 = parse_address_list(iface, cur, false, ext);
 491
 492         if ((cur = tb[OPT_IP6ADDR]))
 493                 n_v6 = parse_address_list(iface, cur, true, ext);
 494
 495         if ((cur = tb[OPT_IP6PREFIX]))
 496                 if (parse_prefix_list(iface, cur) < 0)
 497                         goto out;
 498
 499         if (n_v4 < 0 || n_v6 < 0)
 500                 goto out;
 501
 502         if ((cur = tb[OPT_GATEWAY])) {
 503                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 504                         goto out;
 505         }
 506
 507         if ((cur = tb[OPT_IP6GW])) {
 508                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 509                         goto out;
 510         }
 511
 512         return 0;
 513
 514 out:
 515         return -1;
 516 }
 517
 518 void add_proto_handler(struct proto_handler *p)
 519 {
 520         if (!handlers.comp)
 521                 avl_init(&handlers, avl_strcmp, false, NULL);
 522
 523         if (p->avl.key)
 524                 return;
 525
 526         p->avl.key = p->name;
 527         avl_insert(&handlers, &p->avl);
 528 }
 529
 530 static void
 531 default_proto_free(struct interface_proto_state *proto)
 532 {
 533         free(proto);
 534 }
 535
 536 static int
 537 invalid_proto_handler(struct interface_proto_state *proto,
 538                       enum interface_proto_cmd cmd, bool force)
 539 {
 540         return -1;
 541 }
 542
 543 static int
 544 no_proto_handler(struct interface_proto_state *proto,
 545                  enum interface_proto_cmd cmd, bool force)
 546 {
 547         return 0;
 548 }
 549
 550 static struct interface_proto_state *
 551 default_proto_attach(const struct proto_handler *h,
 552                      struct interface *iface, struct blob_attr *attr)
 553 {
 554         struct interface_proto_state *proto;
 555
 556         proto = calloc(1, sizeof(*proto));
 557         if (!proto)
 558                 return NULL;
 559
 560         proto->free = default_proto_free;
 561         proto->cb = no_proto_handler;
 562
 563         return proto;
 564 }
 565
 566 static const struct proto_handler no_proto = {
 567         .name = "none",
 568         .flags = PROTO_FLAG_IMMEDIATE,
 569         .attach = default_proto_attach,
 570 };
 571
 572 static const struct proto_handler *
 573 get_proto_handler(const char *name)
 574 {
 575         struct proto_handler *proto;
 576
 577         if (!strcmp(name, "none"))
 578             return &no_proto;
 579
 580         if (!handlers.comp)
 581                 return NULL;
 582
 583         return avl_find_element(&handlers, name, proto, avl);
 584 }
 585
 586 void
 587 proto_dump_handlers(struct blob_buf *b)
 588 {
 589         struct proto_handler *p;
 590         void *c;
 591
 592         avl_for_each_element(&handlers, p, avl) {
 593                 void *v;
 594
 595                 c = blobmsg_open_table(b, p->name);
 596                 if (p->config_params && p->config_params->validate) {
 597                         int i;
 598
 599                         v = blobmsg_open_table(b, "validate");
 600                         for (i = 0; i < p->config_params->n_params; i++)
 601                                 blobmsg_add_string(b, p->config_params->params[i].name, uci_get_validate_string(p->config_params, i));
 602                         blobmsg_close_table(b, v);
 603                 }
 604                 blobmsg_add_u8(b, "immediate", !!(p->flags & PROTO_FLAG_IMMEDIATE));
 605                 blobmsg_add_u8(b, "no_device", !!(p->flags & PROTO_FLAG_NODEV));
 606                 blobmsg_add_u8(b, "init_available", !!(p->flags & PROTO_FLAG_INIT_AVAILABLE));
 607                 blobmsg_add_u8(b, "renew_available", !!(p->flags & PROTO_FLAG_RENEW_AVAILABLE));
 608                 blobmsg_add_u8(b, "force_link_default", !!(p->flags & PROTO_FLAG_FORCE_LINK_DEFAULT));
 609                 blobmsg_add_u8(b, "last_error", !!(p->flags & PROTO_FLAG_LASTERROR));
 610                 blobmsg_add_u8(b, "teardown_on_l3_link_down", !!(p->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN));
 611                 blobmsg_add_u8(b, "no_task", !!(p->flags & PROTO_FLAG_NO_TASK));
 612                 blobmsg_close_table(b, c);
 613         }
 614 }
 615
 616 void
 617 proto_init_interface(struct interface *iface, struct blob_attr *attr)
 618 {
 619         const struct proto_handler *proto = iface->proto_handler;
 620         struct interface_proto_state *state = NULL;
 621
 622         if (!proto)
 623                 proto = &no_proto;
 624
 625         state = proto->attach(proto, iface, attr);
 626         if (!state) {
 627                 state = no_proto.attach(&no_proto, iface, attr);
 628                 state->cb = invalid_proto_handler;
 629         }
 630
 631         state->handler = proto;
 632         interface_set_proto_state(iface, state);
 633 }
 634
 635 void
 636 proto_attach_interface(struct interface *iface, const char *proto_name)
 637 {
 638         const struct proto_handler *proto = &no_proto;
 639         const char *error = NULL;
 640
 641         if (proto_name) {
 642                 proto = get_proto_handler(proto_name);
 643                 if (!proto) {
 644                         error = "INVALID_PROTO";
 645                         proto = &no_proto;
 646                 }
 647         }
 648
 649         iface->proto_handler = proto;
 650
 651         if (error)
 652                 interface_add_error(iface, "proto", error, NULL, 0);
 653 }
 654
 655 int
 656 interface_proto_event(struct interface_proto_state *proto,
 657                       enum interface_proto_cmd cmd, bool force)
 658 {
 659         enum interface_proto_event ev;
 660         int ret;
 661
 662         ret = proto->cb(proto, cmd, force);
 663         if (ret || !(proto->handler->flags & PROTO_FLAG_IMMEDIATE))
 664                 goto out;
 665
 666         switch(cmd) {
 667         case PROTO_CMD_SETUP:
 668                 ev = IFPEV_UP;
 669                 break;
 670         case PROTO_CMD_TEARDOWN:
 671                 ev = IFPEV_DOWN;
 672                 break;
 673         case PROTO_CMD_RENEW:
 674                 ev = IFPEV_RENEW;
 675                 break;
 676         default:
 677                 return -EINVAL;
 678         }
 679         proto->proto_event(proto, ev);
 680
 681 out:
 682         return ret;
 683 }