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