proto.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 #include <arpa/inet.h>
  19 #include <netinet/in.h>
  20
  21 #include "netifd.h"
  22 #include "interface.h"
  23 #include "interface-ip.h"
  24 #include "proto.h"
  25
  26 static struct avl_tree handlers;
  27
  28 enum {
  29         OPT_IPADDR,
  30         OPT_IP6ADDR,
  31         OPT_NETMASK,
  32         OPT_BROADCAST,
  33         OPT_GATEWAY,
  34         OPT_IP6GW,
  35         __OPT_MAX,
  36 };
  37
  38 static const struct blobmsg_policy proto_ip_attributes[__OPT_MAX] = {
  39         [OPT_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_ARRAY },
  40         [OPT_IP6ADDR] = { .name = "ip6addr", .type = BLOBMSG_TYPE_ARRAY },
  41         [OPT_NETMASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  42         [OPT_BROADCAST] = { .name = "broadcast", .type = BLOBMSG_TYPE_STRING },
  43         [OPT_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  44         [OPT_IP6GW] = { .name = "ip6gw", .type = BLOBMSG_TYPE_STRING },
  45 };
  46
  47 static const union config_param_info proto_ip_attr_info[__OPT_MAX] = {
  48         [OPT_IPADDR] = { .type = BLOBMSG_TYPE_STRING },
  49         [OPT_IP6ADDR] = { .type = BLOBMSG_TYPE_STRING },
  50 };
  51
  52 const struct config_param_list proto_ip_attr = {
  53         .n_params = __OPT_MAX,
  54         .params = proto_ip_attributes,
  55         .info = proto_ip_attr_info,
  56 };
  57
  58 enum {
  59         ADDR_IPADDR,
  60         ADDR_MASK,
  61         ADDR_BROADCAST,
  62         ADDR_PTP,
  63         __ADDR_MAX
  64 };
  65
  66 static const struct blobmsg_policy proto_ip_addr[__ADDR_MAX] = {
  67         [ADDR_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING },
  68         [ADDR_MASK] = { .name = "mask", .type = BLOBMSG_TYPE_STRING },
  69         [ADDR_BROADCAST] = { .name = "broadcast", .type = BLOBMSG_TYPE_STRING },
  70         [ADDR_PTP] = { .name = "ptp", .type = BLOBMSG_TYPE_STRING },
  71 };
  72
  73 static struct device_addr *
  74 alloc_device_addr(bool v6, bool ext)
  75 {
  76         struct device_addr *addr;
  77
  78         addr = calloc(1, sizeof(*addr));
  79         addr->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
  80         if (ext)
  81                 addr->flags |= DEVADDR_EXTERNAL;
  82
  83         return addr;
  84 }
  85
  86 static bool
  87 parse_addr(struct interface *iface, const char *str, bool v6, int mask,
  88            bool ext, uint32_t broadcast)
  89 {
  90         struct device_addr *addr;
  91         int af = v6 ? AF_INET6 : AF_INET;
  92
  93         addr = alloc_device_addr(v6, ext);
  94         if (!addr)
  95                 return false;
  96
  97         addr->mask = mask;
  98         if (!parse_ip_and_netmask(af, str, &addr->addr, &addr->mask)) {
  99                 interface_add_error(iface, "proto", "INVALID_ADDRESS", &str, 1);
 100                 free(addr);
 101                 return false;
 102         }
 103
 104         if (broadcast)
 105                 addr->broadcast = broadcast;
 106
 107         vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 108         return true;
 109 }
 110
 111 static int
 112 parse_static_address_option(struct interface *iface, struct blob_attr *attr,
 113                             bool v6, int netmask, bool ext, uint32_t broadcast)
 114 {
 115         struct blob_attr *cur;
 116         int n_addr = 0;
 117         int rem;
 118
 119         blobmsg_for_each_attr(cur, attr, rem) {
 120                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 121                         return -1;
 122
 123                 n_addr++;
 124                 if (!parse_addr(iface, blobmsg_data(cur), v6, netmask, ext,
 125                                 broadcast))
 126                         return -1;
 127         }
 128
 129         return n_addr;
 130 }
 131
 132 static struct device_addr *
 133 parse_address_item(struct blob_attr *attr, bool v6, bool ext)
 134 {
 135         struct device_addr *addr;
 136         struct blob_attr *tb[__ADDR_MAX];
 137         struct blob_attr *cur;
 138
 139         if (blobmsg_type(attr) != BLOBMSG_TYPE_TABLE)
 140                 return NULL;
 141
 142         addr = alloc_device_addr(v6, ext);
 143         if (!addr)
 144                 return NULL;
 145
 146         blobmsg_parse(proto_ip_addr, __ADDR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 147
 148         addr->mask = v6 ? 128 : 32;
 149         if ((cur = tb[ADDR_MASK])) {
 150                 unsigned int new_mask;
 151
 152                 new_mask = parse_netmask_string(blobmsg_data(cur), v6);
 153                 if (new_mask > addr->mask)
 154                         goto error;
 155
 156                 addr->mask = new_mask;
 157         }
 158
 159         cur = tb[ADDR_IPADDR];
 160         if (!cur)
 161                 goto error;
 162
 163         if (!inet_pton(v6 ? AF_INET6 : AF_INET, blobmsg_data(cur), &addr->addr))
 164                 goto error;
 165
 166         if (!v6) {
 167                 if ((cur = tb[ADDR_BROADCAST]) &&
 168                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->broadcast))
 169                         goto error;
 170                 if ((cur = tb[ADDR_PTP]) &&
 171                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->point_to_point))
 172                         goto error;
 173         }
 174
 175         return addr;
 176
 177 error:
 178         free(addr);
 179         return NULL;
 180 }
 181
 182 static int
 183 parse_address_list(struct interface *iface, struct blob_attr *attr, bool v6,
 184                    bool ext)
 185 {
 186         struct device_addr *addr;
 187         struct blob_attr *cur;
 188         int n_addr = 0;
 189         int rem;
 190
 191         blobmsg_for_each_attr(cur, attr, rem) {
 192                 addr = parse_address_item(cur, v6, ext);
 193                 if (!addr)
 194                         return -1;
 195
 196                 n_addr++;
 197                 vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 198         }
 199
 200         return n_addr;
 201 }
 202
 203 static bool
 204 parse_gateway_option(struct interface *iface, struct blob_attr *attr, bool v6)
 205 {
 206         struct device_route *route;
 207         const char *str = blobmsg_data(attr);
 208         int af = v6 ? AF_INET6 : AF_INET;
 209
 210         route = calloc(1, sizeof(*route));
 211         if (!inet_pton(af, str, &route->nexthop)) {
 212                 interface_add_error(iface, "proto", "INVALID_GATEWAY", &str, 1);
 213                 free(route);
 214                 return false;
 215         }
 216
 217         route->mask = 0;
 218         route->flags = (v6 ? DEVADDR_INET6 : DEVADDR_INET4);
 219         vlist_add(&iface->proto_ip.route, &route->node, &route->flags);
 220
 221         return true;
 222 }
 223
 224 int
 225 proto_apply_static_ip_settings(struct interface *iface, struct blob_attr *attr)
 226 {
 227         struct blob_attr *tb[__OPT_MAX];
 228         struct blob_attr *cur;
 229         const char *error;
 230         unsigned int netmask = 32;
 231         int n_v4 = 0, n_v6 = 0;
 232         struct in_addr bcast = {};
 233
 234         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 235
 236         if ((cur = tb[OPT_NETMASK])) {
 237                 netmask = parse_netmask_string(blobmsg_data(cur), false);
 238                 if (netmask > 32) {
 239                         error = "INVALID_NETMASK";
 240                         goto error;
 241                 }
 242         }
 243
 244         if ((cur = tb[OPT_BROADCAST])) {
 245                 if (!inet_pton(AF_INET, blobmsg_data(cur), &bcast)) {
 246                         error = "INVALID_BROADCAST";
 247                         goto error;
 248                 }
 249         }
 250
 251         if ((cur = tb[OPT_IPADDR]))
 252                 n_v4 = parse_static_address_option(iface, cur, false,
 253                         netmask, false, bcast.s_addr);
 254
 255         if ((cur = tb[OPT_IP6ADDR]))
 256                 n_v6 = parse_static_address_option(iface, cur, true,
 257                         netmask, false, 0);
 258
 259         if (!n_v4 && !n_v6) {
 260                 error = "NO_ADDRESS";
 261                 goto error;
 262         }
 263
 264         if (n_v4 < 0 || n_v6 < 0)
 265                 goto out;
 266
 267         if ((cur = tb[OPT_GATEWAY])) {
 268                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 269                         goto out;
 270         }
 271
 272         if ((cur = tb[OPT_IP6GW])) {
 273                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 274                         goto out;
 275         }
 276
 277         return 0;
 278
 279 error:
 280         interface_add_error(iface, "proto", error, NULL, 0);
 281 out:
 282         return -1;
 283 }
 284
 285 int
 286 proto_apply_ip_settings(struct interface *iface, struct blob_attr *attr, bool ext)
 287 {
 288         struct blob_attr *tb[__OPT_MAX];
 289         struct blob_attr *cur;
 290         const char *error;
 291         int n_v4 = 0, n_v6 = 0;
 292
 293         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 294
 295         if ((cur = tb[OPT_IPADDR]))
 296                 n_v4 = parse_address_list(iface, cur, false, ext);
 297
 298         if ((cur = tb[OPT_IP6ADDR]))
 299                 n_v6 = parse_address_list(iface, cur, true, ext);
 300
 301         if (!n_v4 && !n_v6) {
 302                 error = "NO_ADDRESS";
 303                 goto error;
 304         }
 305
 306         if (n_v4 < 0 || n_v6 < 0)
 307                 goto out;
 308
 309         if ((cur = tb[OPT_GATEWAY])) {
 310                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 311                         goto out;
 312         }
 313
 314         if ((cur = tb[OPT_IP6GW])) {
 315                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 316                         goto out;
 317         }
 318
 319         return 0;
 320
 321 error:
 322         interface_add_error(iface, "proto", error, NULL, 0);
 323 out:
 324         return -1;
 325 }
 326
 327 void add_proto_handler(struct proto_handler *p)
 328 {
 329         if (!handlers.comp)
 330                 avl_init(&handlers, avl_strcmp, false, NULL);
 331
 332         if (p->avl.key)
 333                 return;
 334
 335         p->avl.key = p->name;
 336         avl_insert(&handlers, &p->avl);
 337 }
 338
 339 static void
 340 default_proto_free(struct interface_proto_state *proto)
 341 {
 342         free(proto);
 343 }
 344
 345 static int
 346 invalid_proto_handler(struct interface_proto_state *proto,
 347                       enum interface_proto_cmd cmd, bool force)
 348 {
 349         return -1;
 350 }
 351
 352 static int
 353 no_proto_handler(struct interface_proto_state *proto,
 354                  enum interface_proto_cmd cmd, bool force)
 355 {
 356         return 0;
 357 }
 358
 359 static struct interface_proto_state *
 360 default_proto_attach(const struct proto_handler *h,
 361                      struct interface *iface, struct blob_attr *attr)
 362 {
 363         struct interface_proto_state *proto;
 364
 365         proto = calloc(1, sizeof(*proto));
 366         proto->free = default_proto_free;
 367         proto->cb = no_proto_handler;
 368
 369         return proto;
 370 }
 371
 372 static const struct proto_handler no_proto = {
 373         .name = "none",
 374         .flags = PROTO_FLAG_IMMEDIATE,
 375         .attach = default_proto_attach,
 376 };
 377
 378 static const struct proto_handler *
 379 get_proto_handler(const char *name)
 380 {
 381         struct proto_handler *proto;
 382
 383         if (!strcmp(name, "none"))
 384             return &no_proto;
 385
 386         if (!handlers.comp)
 387                 return NULL;
 388
 389         return avl_find_element(&handlers, name, proto, avl);
 390 }
 391
 392 void
 393 proto_dump_handlers(struct blob_buf *b)
 394 {
 395         struct proto_handler *p;
 396         void *c;
 397
 398         avl_for_each_element(&handlers, p, avl) {
 399                 c = blobmsg_open_table(b, p->name);
 400                 blobmsg_add_u8(b, "no_device", !!(p->flags & PROTO_FLAG_NODEV));
 401                 blobmsg_close_table(b, c);
 402         }
 403 }
 404
 405 void
 406 proto_init_interface(struct interface *iface, struct blob_attr *attr)
 407 {
 408         const struct proto_handler *proto = iface->proto_handler;
 409         struct interface_proto_state *state = NULL;
 410
 411         if (!proto)
 412                 proto = &no_proto;
 413
 414         state = proto->attach(proto, iface, attr);
 415         if (!state) {
 416                 state = no_proto.attach(&no_proto, iface, attr);
 417                 state->cb = invalid_proto_handler;
 418         }
 419
 420         state->handler = proto;
 421         interface_set_proto_state(iface, state);
 422 }
 423
 424 void
 425 proto_attach_interface(struct interface *iface, const char *proto_name)
 426 {
 427         const struct proto_handler *proto = &no_proto;
 428
 429         if (proto_name) {
 430                 proto = get_proto_handler(proto_name);
 431                 if (!proto) {
 432                         interface_add_error(iface, "proto", "INVALID_PROTO", NULL, 0);
 433                         proto = &no_proto;
 434                 }
 435         }
 436
 437         iface->proto_handler = proto;
 438 }
 439
 440 int
 441 interface_proto_event(struct interface_proto_state *proto,
 442                       enum interface_proto_cmd cmd, bool force)
 443 {
 444         enum interface_proto_event ev;
 445         int ret;
 446
 447         ret = proto->cb(proto, cmd, force);
 448         if (ret || !(proto->handler->flags & PROTO_FLAG_IMMEDIATE))
 449                 goto out;
 450
 451         switch(cmd) {
 452         case PROTO_CMD_SETUP:
 453                 ev = IFPEV_UP;
 454                 break;
 455         case PROTO_CMD_TEARDOWN:
 456                 ev = IFPEV_DOWN;
 457                 break;
 458         default:
 459                 return -EINVAL;
 460         }
 461         proto->proto_event(proto, ev);
 462
 463 out:
 464         return ret;
 465 }