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 bool
 120 parse_addr(struct interface *iface, const char *str, bool v6, int mask,
 121            bool ext, uint32_t broadcast, 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 false;
 129
 130         addr->mask = mask;
 131         if (!parse_ip_and_netmask(af, str, &addr->addr, &addr->mask))
 132                 goto error;
 133
 134         if (!v6) {
 135                 if (IN_EXPERIMENTAL(ntohl(addr->addr.in.s_addr)))
 136                         goto error;
 137
 138         } else if (IN6_IS_ADDR_MULTICAST(&addr->addr.in6))
 139                 goto error;
 140
 141         if (broadcast)
 142                 addr->broadcast = broadcast;
 143
 144         if (ptp)
 145                 addr->point_to_point = ptp;
 146
 147         if (deprecated)
 148                 addr->preferred_until = system_get_rtime();
 149
 150         vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 151         return true;
 152
 153 error:
 154         interface_add_error(iface, "proto", "INVALID_ADDRESS", &str, 1);
 155         free(addr);
 156
 157         return false;
 158 }
 159
 160 static int
 161 parse_static_address_option(struct interface *iface, struct blob_attr *attr,
 162                             bool v6, int netmask, bool ext, uint32_t broadcast,
 163                             uint32_t ptp, bool deprecated)
 164 {
 165         struct blob_attr *cur;
 166         int n_addr = 0;
 167         int rem;
 168
 169         blobmsg_for_each_attr(cur, attr, rem) {
 170                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 171                         return -1;
 172
 173                 n_addr++;
 174                 if (!parse_addr(iface, blobmsg_data(cur), v6, netmask, ext,
 175                                 broadcast, ptp, deprecated))
 176                         return -1;
 177         }
 178
 179         return n_addr;
 180 }
 181
 182 static struct device_addr *
 183 parse_address_item(struct blob_attr *attr, bool v6, bool ext)
 184 {
 185         struct device_addr *addr;
 186         struct blob_attr *tb[__ADDR_MAX];
 187         struct blob_attr *cur;
 188
 189         if (blobmsg_type(attr) != BLOBMSG_TYPE_TABLE)
 190                 return NULL;
 191
 192         addr = alloc_device_addr(v6, ext);
 193         if (!addr)
 194                 return NULL;
 195
 196         blobmsg_parse(proto_ip_addr, __ADDR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 197
 198         addr->mask = v6 ? 128 : 32;
 199         if ((cur = tb[ADDR_MASK])) {
 200                 unsigned int new_mask;
 201
 202                 new_mask = parse_netmask_string(blobmsg_data(cur), v6);
 203                 if (new_mask > addr->mask)
 204                         goto error;
 205
 206                 addr->mask = new_mask;
 207         }
 208
 209         cur = tb[ADDR_IPADDR];
 210         if (!cur)
 211                 goto error;
 212
 213         if (!inet_pton(v6 ? AF_INET6 : AF_INET, blobmsg_data(cur), &addr->addr))
 214                 goto error;
 215
 216         if ((cur = tb[ADDR_OFFLINK]) && blobmsg_get_bool(cur))
 217                 addr->flags |= DEVADDR_OFFLINK;
 218
 219         if (!v6) {
 220                 if ((cur = tb[ADDR_BROADCAST]) &&
 221                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->broadcast))
 222                         goto error;
 223                 if ((cur = tb[ADDR_PTP]) &&
 224                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->point_to_point))
 225                         goto error;
 226         } else {
 227                 time_t now = system_get_rtime();
 228                 if ((cur = tb[ADDR_PREFERRED])) {
 229                         int64_t preferred = blobmsg_get_u32(cur);
 230                         int64_t preferred_until = preferred + (int64_t)now;
 231                         if (preferred_until <= LONG_MAX && preferred != 0xffffffffLL)
 232                                 addr->preferred_until = preferred_until;
 233                 }
 234
 235                 if ((cur = tb[ADDR_VALID])) {
 236                         int64_t valid = blobmsg_get_u32(cur);
 237                         int64_t valid_until = valid + (int64_t)now;
 238                         if (valid_until <= LONG_MAX && valid != 0xffffffffLL)
 239                                 addr->valid_until = valid_until;
 240
 241                 }
 242
 243                 if (addr->valid_until) {
 244                         if (!addr->preferred_until)
 245                                 addr->preferred_until = addr->valid_until;
 246                         else if (addr->preferred_until > addr->valid_until)
 247                                 goto error;
 248                 }
 249
 250                 if ((cur = tb[ADDR_CLASS]))
 251                         addr->pclass = strdup(blobmsg_get_string(cur));
 252         }
 253
 254         return addr;
 255
 256 error:
 257         free(addr);
 258         return NULL;
 259 }
 260
 261 static int
 262 parse_address_list(struct interface *iface, struct blob_attr *attr, bool v6,
 263                    bool ext)
 264 {
 265         struct device_addr *addr;
 266         struct blob_attr *cur;
 267         int n_addr = 0;
 268         int rem;
 269
 270         blobmsg_for_each_attr(cur, attr, rem) {
 271                 addr = parse_address_item(cur, v6, ext);
 272                 if (!addr)
 273                         return -1;
 274
 275                 n_addr++;
 276                 vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 277         }
 278
 279         return n_addr;
 280 }
 281
 282 static bool
 283 parse_gateway_option(struct interface *iface, struct blob_attr *attr, bool v6)
 284 {
 285         struct device_route *route;
 286         const char *str = blobmsg_data(attr);
 287         int af = v6 ? AF_INET6 : AF_INET;
 288
 289         route = calloc(1, sizeof(*route));
 290         if (!route)
 291                 return NULL;
 292
 293         if (!inet_pton(af, str, &route->nexthop)) {
 294                 interface_add_error(iface, "proto", "INVALID_GATEWAY", &str, 1);
 295                 free(route);
 296                 return false;
 297         }
 298
 299         route->mask = 0;
 300         route->flags = (v6 ? DEVADDR_INET6 : DEVADDR_INET4);
 301         route->metric = iface->metric;
 302
 303         unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
 304         if (table) {
 305                 route->table = table;
 306                 route->flags |= DEVROUTE_SRCTABLE;
 307         }
 308
 309         vlist_add(&iface->proto_ip.route, &route->node, route);
 310
 311         return true;
 312 }
 313
 314 static bool
 315 parse_prefix_option(struct interface *iface, const char *str, size_t len)
 316 {
 317         char buf[128] = {0}, *saveptr;
 318         if (len >= sizeof(buf))
 319                 return false;
 320
 321         memcpy(buf, str, len);
 322         char *addrstr = strtok_r(buf, "/", &saveptr);
 323         if (!addrstr)
 324                 return false;
 325
 326         char *lengthstr = strtok_r(NULL, ",", &saveptr);
 327         if (!lengthstr)
 328                 return false;
 329
 330         char *prefstr = strtok_r(NULL, ",", &saveptr);
 331         char *validstr = (!prefstr) ? NULL : strtok_r(NULL, ",", &saveptr);
 332         char *addstr = (!validstr) ? NULL : strtok_r(NULL, ",", &saveptr);
 333         const char *pclass = NULL;
 334
 335         int64_t pref = (!prefstr) ? 0 : strtoul(prefstr, NULL, 10);
 336         int64_t valid = (!validstr) ? 0 : strtoul(validstr, NULL, 10);
 337
 338         uint8_t length = strtoul(lengthstr, NULL, 10), excl_length = 0;
 339         if (length < 1 || length > 64)
 340                 return false;
 341
 342         struct in6_addr addr, excluded, *excludedp = NULL;
 343         if (inet_pton(AF_INET6, addrstr, &addr) < 1)
 344                 return false;
 345
 346         for (; addstr; addstr = strtok_r(NULL, ",", &saveptr)) {
 347                 char *key = NULL, *val = NULL, *addsaveptr;
 348                 if (!(key = strtok_r(addstr, "=", &addsaveptr)) ||
 349                                 !(val = strtok_r(NULL, ",", &addsaveptr)))
 350                         continue;
 351
 352                 if (!strcmp(key, "excluded")) {
 353                         char *sep = strchr(val, '/');
 354                         if (!sep)
 355                                 return false;
 356
 357                         *sep = 0;
 358                         excl_length = atoi(sep + 1);
 359
 360                         if (inet_pton(AF_INET6, val, &excluded) < 1)
 361                                 return false;
 362
 363                         excludedp = &excluded;
 364                 } else if (!strcmp(key, "class")) {
 365                         pclass = val;
 366                 }
 367
 368         }
 369
 370
 371
 372
 373         int64_t now = system_get_rtime();
 374         time_t preferred_until = 0;
 375         if (prefstr && pref != 0xffffffffLL && pref + now <= LONG_MAX)
 376                 preferred_until = pref + now;
 377
 378         time_t valid_until = 0;
 379         if (validstr && valid != 0xffffffffLL && valid + now <= LONG_MAX)
 380                 valid_until = valid + now;
 381
 382         interface_ip_add_device_prefix(iface, &addr, length,
 383                         valid_until, preferred_until,
 384                         excludedp, excl_length, pclass);
 385         return true;
 386 }
 387
 388 static int
 389 parse_prefix_list(struct interface *iface, struct blob_attr *attr)
 390 {
 391         struct blob_attr *cur;
 392         int n_addr = 0;
 393         int rem;
 394
 395         blobmsg_for_each_attr(cur, attr, rem) {
 396                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 397                         return -1;
 398
 399                 n_addr++;
 400                 if (!parse_prefix_option(iface, blobmsg_data(cur),
 401                                 blobmsg_data_len(cur)))
 402                         return -1;
 403         }
 404
 405         return n_addr;
 406 }
 407
 408 int
 409 proto_apply_static_ip_settings(struct interface *iface, struct blob_attr *attr)
 410 {
 411         struct blob_attr *tb[__OPT_MAX];
 412         struct blob_attr *cur;
 413         const char *error;
 414         unsigned int netmask = 32;
 415         bool ip6deprecated;
 416         int n_v4 = 0, n_v6 = 0;
 417         struct in_addr bcast = {}, ptp = {};
 418
 419         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 420
 421         if ((cur = tb[OPT_NETMASK])) {
 422                 netmask = parse_netmask_string(blobmsg_data(cur), false);
 423                 if (netmask > 32) {
 424                         error = "INVALID_NETMASK";
 425                         goto error;
 426                 }
 427         }
 428
 429         if ((cur = tb[OPT_BROADCAST])) {
 430                 if (!inet_pton(AF_INET, blobmsg_data(cur), &bcast)) {
 431                         error = "INVALID_BROADCAST";
 432                         goto error;
 433                 }
 434         }
 435
 436         if ((cur = tb[OPT_PTPADDR])) {
 437                 if (!inet_pton(AF_INET, blobmsg_data(cur), &ptp)) {
 438                         error = "INVALID_PTPADDR";
 439                         goto error;
 440                 }
 441         }
 442
 443         ip6deprecated = blobmsg_get_bool_default(tb[OPT_IP6DEPRECATED], false);
 444
 445         if ((cur = tb[OPT_IPADDR]))
 446                 n_v4 = parse_static_address_option(iface, cur, false,
 447                         netmask, false, bcast.s_addr, ptp.s_addr, false);
 448
 449         if ((cur = tb[OPT_IP6ADDR]))
 450                 n_v6 = parse_static_address_option(iface, cur, true,
 451                         128, false, 0, 0, ip6deprecated);
 452
 453         if ((cur = tb[OPT_IP6PREFIX]))
 454                 if (parse_prefix_list(iface, cur) < 0)
 455                         goto out;
 456
 457         if (n_v4 < 0 || n_v6 < 0)
 458                 goto out;
 459
 460         if ((cur = tb[OPT_GATEWAY])) {
 461                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 462                         goto out;
 463         }
 464
 465         if ((cur = tb[OPT_IP6GW])) {
 466                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 467                         goto out;
 468         }
 469
 470         return 0;
 471
 472 error:
 473         interface_add_error(iface, "proto", error, NULL, 0);
 474 out:
 475         return -1;
 476 }
 477
 478 int
 479 proto_apply_ip_settings(struct interface *iface, struct blob_attr *attr, bool ext)
 480 {
 481         struct blob_attr *tb[__OPT_MAX];
 482         struct blob_attr *cur;
 483         int n_v4 = 0, n_v6 = 0;
 484
 485         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 486
 487         if ((cur = tb[OPT_IPADDR]))
 488                 n_v4 = parse_address_list(iface, cur, false, ext);
 489
 490         if ((cur = tb[OPT_IP6ADDR]))
 491                 n_v6 = parse_address_list(iface, cur, true, ext);
 492
 493         if ((cur = tb[OPT_IP6PREFIX]))
 494                 if (parse_prefix_list(iface, cur) < 0)
 495                         goto out;
 496
 497         if (n_v4 < 0 || n_v6 < 0)
 498                 goto out;
 499
 500         if ((cur = tb[OPT_GATEWAY])) {
 501                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 502                         goto out;
 503         }
 504
 505         if ((cur = tb[OPT_IP6GW])) {
 506                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 507                         goto out;
 508         }
 509
 510         return 0;
 511
 512 out:
 513         return -1;
 514 }
 515
 516 void add_proto_handler(struct proto_handler *p)
 517 {
 518         if (!handlers.comp)
 519                 avl_init(&handlers, avl_strcmp, false, NULL);
 520
 521         if (p->avl.key)
 522                 return;
 523
 524         p->avl.key = p->name;
 525         avl_insert(&handlers, &p->avl);
 526 }
 527
 528 static void
 529 default_proto_free(struct interface_proto_state *proto)
 530 {
 531         free(proto);
 532 }
 533
 534 static int
 535 invalid_proto_handler(struct interface_proto_state *proto,
 536                       enum interface_proto_cmd cmd, bool force)
 537 {
 538         return -1;
 539 }
 540
 541 static int
 542 no_proto_handler(struct interface_proto_state *proto,
 543                  enum interface_proto_cmd cmd, bool force)
 544 {
 545         return 0;
 546 }
 547
 548 static struct interface_proto_state *
 549 default_proto_attach(const struct proto_handler *h,
 550                      struct interface *iface, struct blob_attr *attr)
 551 {
 552         struct interface_proto_state *proto;
 553
 554         proto = calloc(1, sizeof(*proto));
 555         if (!proto)
 556                 return NULL;
 557
 558         proto->free = default_proto_free;
 559         proto->cb = no_proto_handler;
 560
 561         return proto;
 562 }
 563
 564 static const struct proto_handler no_proto = {
 565         .name = "none",
 566         .flags = PROTO_FLAG_IMMEDIATE,
 567         .attach = default_proto_attach,
 568 };
 569
 570 static const struct proto_handler *
 571 get_proto_handler(const char *name)
 572 {
 573         struct proto_handler *proto;
 574
 575         if (!strcmp(name, "none"))
 576             return &no_proto;
 577
 578         if (!handlers.comp)
 579                 return NULL;
 580
 581         return avl_find_element(&handlers, name, proto, avl);
 582 }
 583
 584 void
 585 proto_dump_handlers(struct blob_buf *b)
 586 {
 587         struct proto_handler *p;
 588         void *c;
 589
 590         avl_for_each_element(&handlers, p, avl) {
 591                 void *v;
 592
 593                 c = blobmsg_open_table(b, p->name);
 594                 if (p->config_params && p->config_params->validate) {
 595                         int i;
 596
 597                         v = blobmsg_open_table(b, "validate");
 598                         for (i = 0; i < p->config_params->n_params; i++)
 599                                 blobmsg_add_string(b, p->config_params->params[i].name, uci_get_validate_string(p->config_params, i));
 600                         blobmsg_close_table(b, v);
 601                 }
 602                 blobmsg_add_u8(b, "immediate", !!(p->flags & PROTO_FLAG_IMMEDIATE));
 603                 blobmsg_add_u8(b, "no_device", !!(p->flags & PROTO_FLAG_NODEV));
 604                 blobmsg_add_u8(b, "init_available", !!(p->flags & PROTO_FLAG_INIT_AVAILABLE));
 605                 blobmsg_add_u8(b, "renew_available", !!(p->flags & PROTO_FLAG_RENEW_AVAILABLE));
 606                 blobmsg_add_u8(b, "force_link_default", !!(p->flags & PROTO_FLAG_FORCE_LINK_DEFAULT));
 607                 blobmsg_add_u8(b, "last_error", !!(p->flags & PROTO_FLAG_LASTERROR));
 608                 blobmsg_add_u8(b, "teardown_on_l3_link_down", !!(p->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN));
 609                 blobmsg_add_u8(b, "no_task", !!(p->flags & PROTO_FLAG_NO_TASK));
 610                 blobmsg_close_table(b, c);
 611         }
 612 }
 613
 614 void
 615 proto_init_interface(struct interface *iface, struct blob_attr *attr)
 616 {
 617         const struct proto_handler *proto = iface->proto_handler;
 618         struct interface_proto_state *state = NULL;
 619
 620         if (!proto)
 621                 proto = &no_proto;
 622
 623         state = proto->attach(proto, iface, attr);
 624         if (!state) {
 625                 state = no_proto.attach(&no_proto, iface, attr);
 626                 state->cb = invalid_proto_handler;
 627         }
 628
 629         state->handler = proto;
 630         interface_set_proto_state(iface, state);
 631 }
 632
 633 void
 634 proto_attach_interface(struct interface *iface, const char *proto_name)
 635 {
 636         const struct proto_handler *proto = &no_proto;
 637         const char *error = NULL;
 638
 639         if (proto_name) {
 640                 proto = get_proto_handler(proto_name);
 641                 if (!proto) {
 642                         error = "INVALID_PROTO";
 643                         proto = &no_proto;
 644                 }
 645         }
 646
 647         iface->proto_handler = proto;
 648
 649         if (error)
 650                 interface_add_error(iface, "proto", error, NULL, 0);
 651 }
 652
 653 int
 654 interface_proto_event(struct interface_proto_state *proto,
 655                       enum interface_proto_cmd cmd, bool force)
 656 {
 657         enum interface_proto_event ev;
 658         int ret;
 659
 660         ret = proto->cb(proto, cmd, force);
 661         if (ret || !(proto->handler->flags & PROTO_FLAG_IMMEDIATE))
 662                 goto out;
 663
 664         switch(cmd) {
 665         case PROTO_CMD_SETUP:
 666                 ev = IFPEV_UP;
 667                 break;
 668         case PROTO_CMD_TEARDOWN:
 669                 ev = IFPEV_DOWN;
 670                 break;
 671         case PROTO_CMD_RENEW:
 672                 ev = IFPEV_RENEW;
 673                 break;
 674         default:
 675                 return -EINVAL;
 676         }
 677         proto->proto_event(proto, ev);
 678
 679 out:
 680         return ret;
 681 }