| 1 | /* |
| 2 | * net/tipc/bearer.c: TIPC bearer code |
| 3 | * |
| 4 | * Copyright (c) 1996-2006, 2013-2016, Ericsson AB |
| 5 | * Copyright (c) 2004-2006, 2010-2013, Wind River Systems |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the names of the copyright holders nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * Alternatively, this software may be distributed under the terms of the |
| 21 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 22 | * Software Foundation. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 34 | * POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #include <net/sock.h> |
| 38 | #include "core.h" |
| 39 | #include "bearer.h" |
| 40 | #include "link.h" |
| 41 | #include "discover.h" |
| 42 | #include "monitor.h" |
| 43 | #include "bcast.h" |
| 44 | #include "netlink.h" |
| 45 | #include "udp_media.h" |
| 46 | #include "trace.h" |
| 47 | #include "crypto.h" |
| 48 | |
| 49 | #define MAX_ADDR_STR 60 |
| 50 | |
| 51 | static struct tipc_media * const media_info_array[] = { |
| 52 | ð_media_info, |
| 53 | #ifdef CONFIG_TIPC_MEDIA_IB |
| 54 | &ib_media_info, |
| 55 | #endif |
| 56 | #ifdef CONFIG_TIPC_MEDIA_UDP |
| 57 | &udp_media_info, |
| 58 | #endif |
| 59 | NULL |
| 60 | }; |
| 61 | |
| 62 | static struct tipc_bearer *bearer_get(struct net *net, int bearer_id) |
| 63 | { |
| 64 | struct tipc_net *tn = tipc_net(net); |
| 65 | |
| 66 | return rcu_dereference(tn->bearer_list[bearer_id]); |
| 67 | } |
| 68 | |
| 69 | static void bearer_disable(struct net *net, struct tipc_bearer *b); |
| 70 | static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, |
| 71 | struct packet_type *pt, struct net_device *orig_dev); |
| 72 | |
| 73 | /** |
| 74 | * tipc_media_find - locates specified media object by name |
| 75 | * @name: name to locate |
| 76 | */ |
| 77 | struct tipc_media *tipc_media_find(const char *name) |
| 78 | { |
| 79 | u32 i; |
| 80 | |
| 81 | for (i = 0; media_info_array[i] != NULL; i++) { |
| 82 | if (!strcmp(media_info_array[i]->name, name)) |
| 83 | break; |
| 84 | } |
| 85 | return media_info_array[i]; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * media_find_id - locates specified media object by type identifier |
| 90 | * @type: type identifier to locate |
| 91 | */ |
| 92 | static struct tipc_media *media_find_id(u8 type) |
| 93 | { |
| 94 | u32 i; |
| 95 | |
| 96 | for (i = 0; media_info_array[i] != NULL; i++) { |
| 97 | if (media_info_array[i]->type_id == type) |
| 98 | break; |
| 99 | } |
| 100 | return media_info_array[i]; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * tipc_media_addr_printf - record media address in print buffer |
| 105 | * @buf: output buffer |
| 106 | * @len: output buffer size remaining |
| 107 | * @a: input media address |
| 108 | */ |
| 109 | int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) |
| 110 | { |
| 111 | char addr_str[MAX_ADDR_STR]; |
| 112 | struct tipc_media *m; |
| 113 | int ret; |
| 114 | |
| 115 | m = media_find_id(a->media_id); |
| 116 | |
| 117 | if (m && !m->addr2str(a, addr_str, sizeof(addr_str))) |
| 118 | ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str); |
| 119 | else { |
| 120 | u32 i; |
| 121 | |
| 122 | ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); |
| 123 | for (i = 0; i < sizeof(a->value); i++) |
| 124 | ret += scnprintf(buf + ret, len - ret, |
| 125 | "-%x", a->value[i]); |
| 126 | } |
| 127 | return ret; |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * bearer_name_validate - validate & (optionally) deconstruct bearer name |
| 132 | * @name: ptr to bearer name string |
| 133 | * @name_parts: ptr to area for bearer name components (or NULL if not needed) |
| 134 | * |
| 135 | * Return: 1 if bearer name is valid, otherwise 0. |
| 136 | */ |
| 137 | static int bearer_name_validate(const char *name, |
| 138 | struct tipc_bearer_names *name_parts) |
| 139 | { |
| 140 | char name_copy[TIPC_MAX_BEARER_NAME]; |
| 141 | char *media_name; |
| 142 | char *if_name; |
| 143 | u32 media_len; |
| 144 | u32 if_len; |
| 145 | |
| 146 | /* copy bearer name & ensure length is OK */ |
| 147 | if (strscpy(name_copy, name, TIPC_MAX_BEARER_NAME) < 0) |
| 148 | return 0; |
| 149 | |
| 150 | /* ensure all component parts of bearer name are present */ |
| 151 | media_name = name_copy; |
| 152 | if_name = strchr(media_name, ':'); |
| 153 | if (if_name == NULL) |
| 154 | return 0; |
| 155 | *(if_name++) = 0; |
| 156 | media_len = if_name - media_name; |
| 157 | if_len = strlen(if_name) + 1; |
| 158 | |
| 159 | /* validate component parts of bearer name */ |
| 160 | if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || |
| 161 | (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) |
| 162 | return 0; |
| 163 | |
| 164 | /* return bearer name components, if necessary */ |
| 165 | if (name_parts) { |
| 166 | if (strscpy(name_parts->media_name, media_name, |
| 167 | TIPC_MAX_MEDIA_NAME) < 0) |
| 168 | return 0; |
| 169 | if (strscpy(name_parts->if_name, if_name, |
| 170 | TIPC_MAX_IF_NAME) < 0) |
| 171 | return 0; |
| 172 | } |
| 173 | return 1; |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * tipc_bearer_find - locates bearer object with matching bearer name |
| 178 | * @net: the applicable net namespace |
| 179 | * @name: bearer name to locate |
| 180 | */ |
| 181 | struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) |
| 182 | { |
| 183 | struct tipc_net *tn = tipc_net(net); |
| 184 | struct tipc_bearer *b; |
| 185 | u32 i; |
| 186 | |
| 187 | for (i = 0; i < MAX_BEARERS; i++) { |
| 188 | b = rtnl_dereference(tn->bearer_list[i]); |
| 189 | if (b && (!strcmp(b->name, name))) |
| 190 | return b; |
| 191 | } |
| 192 | return NULL; |
| 193 | } |
| 194 | |
| 195 | /* tipc_bearer_get_name - get the bearer name from its id. |
| 196 | * @net: network namespace |
| 197 | * @name: a pointer to the buffer where the name will be stored. |
| 198 | * @bearer_id: the id to get the name from. |
| 199 | */ |
| 200 | int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id) |
| 201 | { |
| 202 | struct tipc_net *tn = tipc_net(net); |
| 203 | struct tipc_bearer *b; |
| 204 | |
| 205 | if (bearer_id >= MAX_BEARERS) |
| 206 | return -EINVAL; |
| 207 | |
| 208 | b = rtnl_dereference(tn->bearer_list[bearer_id]); |
| 209 | if (!b) |
| 210 | return -EINVAL; |
| 211 | |
| 212 | strcpy(name, b->name); |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) |
| 217 | { |
| 218 | struct tipc_bearer *b; |
| 219 | |
| 220 | rcu_read_lock(); |
| 221 | b = bearer_get(net, bearer_id); |
| 222 | if (b) |
| 223 | tipc_disc_add_dest(b->disc); |
| 224 | rcu_read_unlock(); |
| 225 | } |
| 226 | |
| 227 | void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) |
| 228 | { |
| 229 | struct tipc_bearer *b; |
| 230 | |
| 231 | rcu_read_lock(); |
| 232 | b = bearer_get(net, bearer_id); |
| 233 | if (b) |
| 234 | tipc_disc_remove_dest(b->disc); |
| 235 | rcu_read_unlock(); |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * tipc_enable_bearer - enable bearer with the given name |
| 240 | * @net: the applicable net namespace |
| 241 | * @name: bearer name to enable |
| 242 | * @disc_domain: bearer domain |
| 243 | * @prio: bearer priority |
| 244 | * @attr: nlattr array |
| 245 | * @extack: netlink extended ack |
| 246 | */ |
| 247 | static int tipc_enable_bearer(struct net *net, const char *name, |
| 248 | u32 disc_domain, u32 prio, |
| 249 | struct nlattr *attr[], |
| 250 | struct netlink_ext_ack *extack) |
| 251 | { |
| 252 | struct tipc_net *tn = tipc_net(net); |
| 253 | struct tipc_bearer_names b_names; |
| 254 | int with_this_prio = 1; |
| 255 | struct tipc_bearer *b; |
| 256 | struct tipc_media *m; |
| 257 | struct sk_buff *skb; |
| 258 | int bearer_id = 0; |
| 259 | int res = -EINVAL; |
| 260 | char *errstr = ""; |
| 261 | u32 i; |
| 262 | |
| 263 | if (!bearer_name_validate(name, &b_names)) { |
| 264 | NL_SET_ERR_MSG(extack, "Illegal name"); |
| 265 | return res; |
| 266 | } |
| 267 | |
| 268 | if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) { |
| 269 | errstr = "illegal priority"; |
| 270 | NL_SET_ERR_MSG(extack, "Illegal priority"); |
| 271 | goto rejected; |
| 272 | } |
| 273 | |
| 274 | m = tipc_media_find(b_names.media_name); |
| 275 | if (!m) { |
| 276 | errstr = "media not registered"; |
| 277 | NL_SET_ERR_MSG(extack, "Media not registered"); |
| 278 | goto rejected; |
| 279 | } |
| 280 | |
| 281 | if (prio == TIPC_MEDIA_LINK_PRI) |
| 282 | prio = m->priority; |
| 283 | |
| 284 | /* Check new bearer vs existing ones and find free bearer id if any */ |
| 285 | bearer_id = MAX_BEARERS; |
| 286 | i = MAX_BEARERS; |
| 287 | while (i-- != 0) { |
| 288 | b = rtnl_dereference(tn->bearer_list[i]); |
| 289 | if (!b) { |
| 290 | bearer_id = i; |
| 291 | continue; |
| 292 | } |
| 293 | if (!strcmp(name, b->name)) { |
| 294 | errstr = "already enabled"; |
| 295 | NL_SET_ERR_MSG(extack, "Already enabled"); |
| 296 | goto rejected; |
| 297 | } |
| 298 | |
| 299 | if (b->priority == prio && |
| 300 | (++with_this_prio > 2)) { |
| 301 | pr_warn("Bearer <%s>: already 2 bearers with priority %u\n", |
| 302 | name, prio); |
| 303 | |
| 304 | if (prio == TIPC_MIN_LINK_PRI) { |
| 305 | errstr = "cannot adjust to lower"; |
| 306 | NL_SET_ERR_MSG(extack, "Cannot adjust to lower"); |
| 307 | goto rejected; |
| 308 | } |
| 309 | |
| 310 | pr_warn("Bearer <%s>: trying with adjusted priority\n", |
| 311 | name); |
| 312 | prio--; |
| 313 | bearer_id = MAX_BEARERS; |
| 314 | i = MAX_BEARERS; |
| 315 | with_this_prio = 1; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | if (bearer_id >= MAX_BEARERS) { |
| 320 | errstr = "max 3 bearers permitted"; |
| 321 | NL_SET_ERR_MSG(extack, "Max 3 bearers permitted"); |
| 322 | goto rejected; |
| 323 | } |
| 324 | |
| 325 | b = kzalloc(sizeof(*b), GFP_ATOMIC); |
| 326 | if (!b) |
| 327 | return -ENOMEM; |
| 328 | |
| 329 | strscpy(b->name, name); |
| 330 | b->media = m; |
| 331 | res = m->enable_media(net, b, attr); |
| 332 | if (res) { |
| 333 | kfree(b); |
| 334 | errstr = "failed to enable media"; |
| 335 | NL_SET_ERR_MSG(extack, "Failed to enable media"); |
| 336 | goto rejected; |
| 337 | } |
| 338 | |
| 339 | b->identity = bearer_id; |
| 340 | b->tolerance = m->tolerance; |
| 341 | b->min_win = m->min_win; |
| 342 | b->max_win = m->max_win; |
| 343 | b->domain = disc_domain; |
| 344 | b->net_plane = bearer_id + 'A'; |
| 345 | b->priority = prio; |
| 346 | refcount_set(&b->refcnt, 1); |
| 347 | |
| 348 | res = tipc_disc_create(net, b, &b->bcast_addr, &skb); |
| 349 | if (res) { |
| 350 | bearer_disable(net, b); |
| 351 | errstr = "failed to create discoverer"; |
| 352 | NL_SET_ERR_MSG(extack, "Failed to create discoverer"); |
| 353 | goto rejected; |
| 354 | } |
| 355 | |
| 356 | /* Create monitoring data before accepting activate messages */ |
| 357 | if (tipc_mon_create(net, bearer_id)) { |
| 358 | bearer_disable(net, b); |
| 359 | kfree_skb(skb); |
| 360 | return -ENOMEM; |
| 361 | } |
| 362 | |
| 363 | test_and_set_bit_lock(0, &b->up); |
| 364 | rcu_assign_pointer(tn->bearer_list[bearer_id], b); |
| 365 | if (skb) |
| 366 | tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); |
| 367 | |
| 368 | pr_info("Enabled bearer <%s>, priority %u\n", name, prio); |
| 369 | |
| 370 | return res; |
| 371 | rejected: |
| 372 | pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr); |
| 373 | return res; |
| 374 | } |
| 375 | |
| 376 | /** |
| 377 | * tipc_reset_bearer - Reset all links established over this bearer |
| 378 | * @net: the applicable net namespace |
| 379 | * @b: the target bearer |
| 380 | */ |
| 381 | static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) |
| 382 | { |
| 383 | pr_info("Resetting bearer <%s>\n", b->name); |
| 384 | tipc_node_delete_links(net, b->identity); |
| 385 | tipc_disc_reset(net, b); |
| 386 | return 0; |
| 387 | } |
| 388 | |
| 389 | bool tipc_bearer_hold(struct tipc_bearer *b) |
| 390 | { |
| 391 | return (b && refcount_inc_not_zero(&b->refcnt)); |
| 392 | } |
| 393 | |
| 394 | void tipc_bearer_put(struct tipc_bearer *b) |
| 395 | { |
| 396 | if (b && refcount_dec_and_test(&b->refcnt)) |
| 397 | kfree_rcu(b, rcu); |
| 398 | } |
| 399 | |
| 400 | /** |
| 401 | * bearer_disable - disable this bearer |
| 402 | * @net: the applicable net namespace |
| 403 | * @b: the bearer to disable |
| 404 | * |
| 405 | * Note: This routine assumes caller holds RTNL lock. |
| 406 | */ |
| 407 | static void bearer_disable(struct net *net, struct tipc_bearer *b) |
| 408 | { |
| 409 | struct tipc_net *tn = tipc_net(net); |
| 410 | int bearer_id = b->identity; |
| 411 | |
| 412 | pr_info("Disabling bearer <%s>\n", b->name); |
| 413 | clear_bit_unlock(0, &b->up); |
| 414 | tipc_node_delete_links(net, bearer_id); |
| 415 | b->media->disable_media(b); |
| 416 | RCU_INIT_POINTER(b->media_ptr, NULL); |
| 417 | if (b->disc) |
| 418 | tipc_disc_delete(b->disc); |
| 419 | RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); |
| 420 | tipc_bearer_put(b); |
| 421 | tipc_mon_delete(net, bearer_id); |
| 422 | } |
| 423 | |
| 424 | int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, |
| 425 | struct nlattr *attr[]) |
| 426 | { |
| 427 | char *dev_name = strchr((const char *)b->name, ':') + 1; |
| 428 | int hwaddr_len = b->media->hwaddr_len; |
| 429 | u8 node_id[NODE_ID_LEN] = {0,}; |
| 430 | struct net_device *dev; |
| 431 | |
| 432 | /* Find device with specified name */ |
| 433 | dev = dev_get_by_name(net, dev_name); |
| 434 | if (!dev) |
| 435 | return -ENODEV; |
| 436 | if (tipc_mtu_bad(dev)) { |
| 437 | dev_put(dev); |
| 438 | return -EINVAL; |
| 439 | } |
| 440 | if (dev == net->loopback_dev) { |
| 441 | dev_put(dev); |
| 442 | pr_info("Enabling <%s> not permitted\n", b->name); |
| 443 | return -EINVAL; |
| 444 | } |
| 445 | |
| 446 | /* Autoconfigure own node identity if needed */ |
| 447 | if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) { |
| 448 | memcpy(node_id, dev->dev_addr, hwaddr_len); |
| 449 | tipc_net_init(net, node_id, 0); |
| 450 | } |
| 451 | if (!tipc_own_id(net)) { |
| 452 | dev_put(dev); |
| 453 | pr_warn("Failed to obtain node identity\n"); |
| 454 | return -EINVAL; |
| 455 | } |
| 456 | |
| 457 | /* Associate TIPC bearer with L2 bearer */ |
| 458 | rcu_assign_pointer(b->media_ptr, dev); |
| 459 | b->pt.dev = dev; |
| 460 | b->pt.type = htons(ETH_P_TIPC); |
| 461 | b->pt.func = tipc_l2_rcv_msg; |
| 462 | dev_add_pack(&b->pt); |
| 463 | memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); |
| 464 | memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len); |
| 465 | b->bcast_addr.media_id = b->media->type_id; |
| 466 | b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; |
| 467 | b->mtu = dev->mtu; |
| 468 | b->media->raw2addr(b, &b->addr, (const char *)dev->dev_addr); |
| 469 | rcu_assign_pointer(dev->tipc_ptr, b); |
| 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface |
| 474 | * @b: the target bearer |
| 475 | * |
| 476 | * Mark L2 bearer as inactive so that incoming buffers are thrown away |
| 477 | */ |
| 478 | void tipc_disable_l2_media(struct tipc_bearer *b) |
| 479 | { |
| 480 | struct net_device *dev; |
| 481 | |
| 482 | dev = (struct net_device *)rtnl_dereference(b->media_ptr); |
| 483 | dev_remove_pack(&b->pt); |
| 484 | RCU_INIT_POINTER(dev->tipc_ptr, NULL); |
| 485 | synchronize_net(); |
| 486 | dev_put(dev); |
| 487 | } |
| 488 | |
| 489 | /** |
| 490 | * tipc_l2_send_msg - send a TIPC packet out over an L2 interface |
| 491 | * @net: the associated network namespace |
| 492 | * @skb: the packet to be sent |
| 493 | * @b: the bearer through which the packet is to be sent |
| 494 | * @dest: peer destination address |
| 495 | */ |
| 496 | int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, |
| 497 | struct tipc_bearer *b, struct tipc_media_addr *dest) |
| 498 | { |
| 499 | struct net_device *dev; |
| 500 | int delta; |
| 501 | |
| 502 | dev = (struct net_device *)rcu_dereference(b->media_ptr); |
| 503 | if (!dev) |
| 504 | return 0; |
| 505 | |
| 506 | delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); |
| 507 | if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) { |
| 508 | kfree_skb(skb); |
| 509 | return 0; |
| 510 | } |
| 511 | skb_reset_network_header(skb); |
| 512 | skb->dev = dev; |
| 513 | skb->protocol = htons(ETH_P_TIPC); |
| 514 | dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, |
| 515 | dev->dev_addr, skb->len); |
| 516 | dev_queue_xmit(skb); |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id) |
| 521 | { |
| 522 | bool supp = false; |
| 523 | struct tipc_bearer *b; |
| 524 | |
| 525 | rcu_read_lock(); |
| 526 | b = bearer_get(net, bearer_id); |
| 527 | if (b) |
| 528 | supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT); |
| 529 | rcu_read_unlock(); |
| 530 | return supp; |
| 531 | } |
| 532 | |
| 533 | int tipc_bearer_mtu(struct net *net, u32 bearer_id) |
| 534 | { |
| 535 | int mtu = 0; |
| 536 | struct tipc_bearer *b; |
| 537 | |
| 538 | rcu_read_lock(); |
| 539 | b = bearer_get(net, bearer_id); |
| 540 | if (b) |
| 541 | mtu = b->mtu; |
| 542 | rcu_read_unlock(); |
| 543 | return mtu; |
| 544 | } |
| 545 | |
| 546 | int tipc_bearer_min_mtu(struct net *net, u32 bearer_id) |
| 547 | { |
| 548 | int mtu = TIPC_MIN_BEARER_MTU; |
| 549 | struct tipc_bearer *b; |
| 550 | |
| 551 | rcu_read_lock(); |
| 552 | b = bearer_get(net, bearer_id); |
| 553 | if (b) |
| 554 | mtu += b->encap_hlen; |
| 555 | rcu_read_unlock(); |
| 556 | return mtu; |
| 557 | } |
| 558 | |
| 559 | /* tipc_bearer_xmit_skb - sends buffer to destination over bearer |
| 560 | */ |
| 561 | void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, |
| 562 | struct sk_buff *skb, |
| 563 | struct tipc_media_addr *dest) |
| 564 | { |
| 565 | struct tipc_msg *hdr = buf_msg(skb); |
| 566 | struct tipc_bearer *b; |
| 567 | |
| 568 | rcu_read_lock(); |
| 569 | b = bearer_get(net, bearer_id); |
| 570 | if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) { |
| 571 | #ifdef CONFIG_TIPC_CRYPTO |
| 572 | tipc_crypto_xmit(net, &skb, b, dest, NULL); |
| 573 | if (skb) |
| 574 | #endif |
| 575 | b->media->send_msg(net, skb, b, dest); |
| 576 | } else { |
| 577 | kfree_skb(skb); |
| 578 | } |
| 579 | rcu_read_unlock(); |
| 580 | } |
| 581 | |
| 582 | /* tipc_bearer_xmit() -send buffer to destination over bearer |
| 583 | */ |
| 584 | void tipc_bearer_xmit(struct net *net, u32 bearer_id, |
| 585 | struct sk_buff_head *xmitq, |
| 586 | struct tipc_media_addr *dst, |
| 587 | struct tipc_node *__dnode) |
| 588 | { |
| 589 | struct tipc_bearer *b; |
| 590 | struct sk_buff *skb, *tmp; |
| 591 | |
| 592 | if (skb_queue_empty(xmitq)) |
| 593 | return; |
| 594 | |
| 595 | rcu_read_lock(); |
| 596 | b = bearer_get(net, bearer_id); |
| 597 | if (unlikely(!b)) |
| 598 | __skb_queue_purge(xmitq); |
| 599 | skb_queue_walk_safe(xmitq, skb, tmp) { |
| 600 | __skb_dequeue(xmitq); |
| 601 | if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) { |
| 602 | #ifdef CONFIG_TIPC_CRYPTO |
| 603 | tipc_crypto_xmit(net, &skb, b, dst, __dnode); |
| 604 | if (skb) |
| 605 | #endif |
| 606 | b->media->send_msg(net, skb, b, dst); |
| 607 | } else { |
| 608 | kfree_skb(skb); |
| 609 | } |
| 610 | } |
| 611 | rcu_read_unlock(); |
| 612 | } |
| 613 | |
| 614 | /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations |
| 615 | */ |
| 616 | void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, |
| 617 | struct sk_buff_head *xmitq) |
| 618 | { |
| 619 | struct tipc_net *tn = tipc_net(net); |
| 620 | struct tipc_media_addr *dst; |
| 621 | int net_id = tn->net_id; |
| 622 | struct tipc_bearer *b; |
| 623 | struct sk_buff *skb, *tmp; |
| 624 | struct tipc_msg *hdr; |
| 625 | |
| 626 | rcu_read_lock(); |
| 627 | b = bearer_get(net, bearer_id); |
| 628 | if (unlikely(!b || !test_bit(0, &b->up))) |
| 629 | __skb_queue_purge(xmitq); |
| 630 | skb_queue_walk_safe(xmitq, skb, tmp) { |
| 631 | hdr = buf_msg(skb); |
| 632 | msg_set_non_seq(hdr, 1); |
| 633 | msg_set_mc_netid(hdr, net_id); |
| 634 | __skb_dequeue(xmitq); |
| 635 | dst = &b->bcast_addr; |
| 636 | #ifdef CONFIG_TIPC_CRYPTO |
| 637 | tipc_crypto_xmit(net, &skb, b, dst, NULL); |
| 638 | if (skb) |
| 639 | #endif |
| 640 | b->media->send_msg(net, skb, b, dst); |
| 641 | } |
| 642 | rcu_read_unlock(); |
| 643 | } |
| 644 | |
| 645 | /** |
| 646 | * tipc_l2_rcv_msg - handle incoming TIPC message from an interface |
| 647 | * @skb: the received message |
| 648 | * @dev: the net device that the packet was received on |
| 649 | * @pt: the packet_type structure which was used to register this handler |
| 650 | * @orig_dev: the original receive net device in case the device is a bond |
| 651 | * |
| 652 | * Accept only packets explicitly sent to this node, or broadcast packets; |
| 653 | * ignores packets sent using interface multicast, and traffic sent to other |
| 654 | * nodes (which can happen if interface is running in promiscuous mode). |
| 655 | */ |
| 656 | static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, |
| 657 | struct packet_type *pt, struct net_device *orig_dev) |
| 658 | { |
| 659 | struct tipc_bearer *b; |
| 660 | |
| 661 | rcu_read_lock(); |
| 662 | b = rcu_dereference(dev->tipc_ptr) ?: |
| 663 | rcu_dereference(orig_dev->tipc_ptr); |
| 664 | if (likely(b && test_bit(0, &b->up) && |
| 665 | (skb->pkt_type <= PACKET_MULTICAST))) { |
| 666 | skb_mark_not_on_list(skb); |
| 667 | TIPC_SKB_CB(skb)->flags = 0; |
| 668 | tipc_rcv(dev_net(b->pt.dev), skb, b); |
| 669 | rcu_read_unlock(); |
| 670 | return NET_RX_SUCCESS; |
| 671 | } |
| 672 | rcu_read_unlock(); |
| 673 | kfree_skb(skb); |
| 674 | return NET_RX_DROP; |
| 675 | } |
| 676 | |
| 677 | /** |
| 678 | * tipc_l2_device_event - handle device events from network device |
| 679 | * @nb: the context of the notification |
| 680 | * @evt: the type of event |
| 681 | * @ptr: the net device that the event was on |
| 682 | * |
| 683 | * This function is called by the Ethernet driver in case of link |
| 684 | * change event. |
| 685 | */ |
| 686 | static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, |
| 687 | void *ptr) |
| 688 | { |
| 689 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 690 | struct net *net = dev_net(dev); |
| 691 | struct tipc_bearer *b; |
| 692 | |
| 693 | b = rtnl_dereference(dev->tipc_ptr); |
| 694 | if (!b) |
| 695 | return NOTIFY_DONE; |
| 696 | |
| 697 | trace_tipc_l2_device_event(dev, b, evt); |
| 698 | switch (evt) { |
| 699 | case NETDEV_CHANGE: |
| 700 | if (netif_carrier_ok(dev) && netif_oper_up(dev)) { |
| 701 | test_and_set_bit_lock(0, &b->up); |
| 702 | break; |
| 703 | } |
| 704 | fallthrough; |
| 705 | case NETDEV_GOING_DOWN: |
| 706 | clear_bit_unlock(0, &b->up); |
| 707 | tipc_reset_bearer(net, b); |
| 708 | break; |
| 709 | case NETDEV_UP: |
| 710 | test_and_set_bit_lock(0, &b->up); |
| 711 | break; |
| 712 | case NETDEV_CHANGEMTU: |
| 713 | if (tipc_mtu_bad(dev)) { |
| 714 | bearer_disable(net, b); |
| 715 | break; |
| 716 | } |
| 717 | b->mtu = dev->mtu; |
| 718 | tipc_reset_bearer(net, b); |
| 719 | break; |
| 720 | case NETDEV_CHANGEADDR: |
| 721 | b->media->raw2addr(b, &b->addr, |
| 722 | (const char *)dev->dev_addr); |
| 723 | tipc_reset_bearer(net, b); |
| 724 | break; |
| 725 | case NETDEV_UNREGISTER: |
| 726 | case NETDEV_CHANGENAME: |
| 727 | bearer_disable(net, b); |
| 728 | break; |
| 729 | } |
| 730 | return NOTIFY_OK; |
| 731 | } |
| 732 | |
| 733 | static struct notifier_block notifier = { |
| 734 | .notifier_call = tipc_l2_device_event, |
| 735 | .priority = 0, |
| 736 | }; |
| 737 | |
| 738 | int tipc_bearer_setup(void) |
| 739 | { |
| 740 | return register_netdevice_notifier(¬ifier); |
| 741 | } |
| 742 | |
| 743 | void tipc_bearer_cleanup(void) |
| 744 | { |
| 745 | unregister_netdevice_notifier(¬ifier); |
| 746 | } |
| 747 | |
| 748 | void tipc_bearer_stop(struct net *net) |
| 749 | { |
| 750 | struct tipc_net *tn = tipc_net(net); |
| 751 | struct tipc_bearer *b; |
| 752 | u32 i; |
| 753 | |
| 754 | for (i = 0; i < MAX_BEARERS; i++) { |
| 755 | b = rtnl_dereference(tn->bearer_list[i]); |
| 756 | if (b) { |
| 757 | bearer_disable(net, b); |
| 758 | tn->bearer_list[i] = NULL; |
| 759 | } |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts) |
| 764 | { |
| 765 | struct net_device *dev = net->loopback_dev; |
| 766 | struct sk_buff *skb, *_skb; |
| 767 | int exp; |
| 768 | |
| 769 | skb_queue_walk(pkts, _skb) { |
| 770 | skb = pskb_copy(_skb, GFP_ATOMIC); |
| 771 | if (!skb) |
| 772 | continue; |
| 773 | |
| 774 | exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); |
| 775 | if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) { |
| 776 | kfree_skb(skb); |
| 777 | continue; |
| 778 | } |
| 779 | |
| 780 | skb_reset_network_header(skb); |
| 781 | dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr, |
| 782 | dev->dev_addr, skb->len); |
| 783 | skb->dev = dev; |
| 784 | skb->pkt_type = PACKET_HOST; |
| 785 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 786 | skb->protocol = eth_type_trans(skb, dev); |
| 787 | netif_rx(skb); |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev, |
| 792 | struct packet_type *pt, struct net_device *od) |
| 793 | { |
| 794 | consume_skb(skb); |
| 795 | return NET_RX_SUCCESS; |
| 796 | } |
| 797 | |
| 798 | int tipc_attach_loopback(struct net *net) |
| 799 | { |
| 800 | struct net_device *dev = net->loopback_dev; |
| 801 | struct tipc_net *tn = tipc_net(net); |
| 802 | |
| 803 | if (!dev) |
| 804 | return -ENODEV; |
| 805 | |
| 806 | netdev_hold(dev, &tn->loopback_pt.dev_tracker, GFP_KERNEL); |
| 807 | tn->loopback_pt.dev = dev; |
| 808 | tn->loopback_pt.type = htons(ETH_P_TIPC); |
| 809 | tn->loopback_pt.func = tipc_loopback_rcv_pkt; |
| 810 | dev_add_pack(&tn->loopback_pt); |
| 811 | return 0; |
| 812 | } |
| 813 | |
| 814 | void tipc_detach_loopback(struct net *net) |
| 815 | { |
| 816 | struct tipc_net *tn = tipc_net(net); |
| 817 | |
| 818 | dev_remove_pack(&tn->loopback_pt); |
| 819 | netdev_put(net->loopback_dev, &tn->loopback_pt.dev_tracker); |
| 820 | } |
| 821 | |
| 822 | /* Caller should hold rtnl_lock to protect the bearer */ |
| 823 | static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, |
| 824 | struct tipc_bearer *bearer, int nlflags) |
| 825 | { |
| 826 | void *hdr; |
| 827 | struct nlattr *attrs; |
| 828 | struct nlattr *prop; |
| 829 | |
| 830 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
| 831 | nlflags, TIPC_NL_BEARER_GET); |
| 832 | if (!hdr) |
| 833 | return -EMSGSIZE; |
| 834 | |
| 835 | attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER); |
| 836 | if (!attrs) |
| 837 | goto msg_full; |
| 838 | |
| 839 | if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) |
| 840 | goto attr_msg_full; |
| 841 | |
| 842 | prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP); |
| 843 | if (!prop) |
| 844 | goto prop_msg_full; |
| 845 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) |
| 846 | goto prop_msg_full; |
| 847 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) |
| 848 | goto prop_msg_full; |
| 849 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win)) |
| 850 | goto prop_msg_full; |
| 851 | if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) |
| 852 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu)) |
| 853 | goto prop_msg_full; |
| 854 | |
| 855 | nla_nest_end(msg->skb, prop); |
| 856 | |
| 857 | #ifdef CONFIG_TIPC_MEDIA_UDP |
| 858 | if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) { |
| 859 | if (tipc_udp_nl_add_bearer_data(msg, bearer)) |
| 860 | goto attr_msg_full; |
| 861 | } |
| 862 | #endif |
| 863 | |
| 864 | nla_nest_end(msg->skb, attrs); |
| 865 | genlmsg_end(msg->skb, hdr); |
| 866 | |
| 867 | return 0; |
| 868 | |
| 869 | prop_msg_full: |
| 870 | nla_nest_cancel(msg->skb, prop); |
| 871 | attr_msg_full: |
| 872 | nla_nest_cancel(msg->skb, attrs); |
| 873 | msg_full: |
| 874 | genlmsg_cancel(msg->skb, hdr); |
| 875 | |
| 876 | return -EMSGSIZE; |
| 877 | } |
| 878 | |
| 879 | int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 880 | { |
| 881 | int err; |
| 882 | int i = cb->args[0]; |
| 883 | struct tipc_bearer *bearer; |
| 884 | struct tipc_nl_msg msg; |
| 885 | struct net *net = sock_net(skb->sk); |
| 886 | struct tipc_net *tn = tipc_net(net); |
| 887 | |
| 888 | if (i == MAX_BEARERS) |
| 889 | return 0; |
| 890 | |
| 891 | msg.skb = skb; |
| 892 | msg.portid = NETLINK_CB(cb->skb).portid; |
| 893 | msg.seq = cb->nlh->nlmsg_seq; |
| 894 | |
| 895 | rtnl_lock(); |
| 896 | for (i = 0; i < MAX_BEARERS; i++) { |
| 897 | bearer = rtnl_dereference(tn->bearer_list[i]); |
| 898 | if (!bearer) |
| 899 | continue; |
| 900 | |
| 901 | err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); |
| 902 | if (err) |
| 903 | break; |
| 904 | } |
| 905 | rtnl_unlock(); |
| 906 | |
| 907 | cb->args[0] = i; |
| 908 | return skb->len; |
| 909 | } |
| 910 | |
| 911 | int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) |
| 912 | { |
| 913 | int err; |
| 914 | char *name; |
| 915 | struct sk_buff *rep; |
| 916 | struct tipc_bearer *bearer; |
| 917 | struct tipc_nl_msg msg; |
| 918 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 919 | struct net *net = genl_info_net(info); |
| 920 | |
| 921 | if (!info->attrs[TIPC_NLA_BEARER]) |
| 922 | return -EINVAL; |
| 923 | |
| 924 | err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, |
| 925 | info->attrs[TIPC_NLA_BEARER], |
| 926 | tipc_nl_bearer_policy, info->extack); |
| 927 | if (err) |
| 928 | return err; |
| 929 | |
| 930 | if (!attrs[TIPC_NLA_BEARER_NAME]) |
| 931 | return -EINVAL; |
| 932 | name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| 933 | |
| 934 | rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 935 | if (!rep) |
| 936 | return -ENOMEM; |
| 937 | |
| 938 | msg.skb = rep; |
| 939 | msg.portid = info->snd_portid; |
| 940 | msg.seq = info->snd_seq; |
| 941 | |
| 942 | rtnl_lock(); |
| 943 | bearer = tipc_bearer_find(net, name); |
| 944 | if (!bearer) { |
| 945 | err = -EINVAL; |
| 946 | NL_SET_ERR_MSG(info->extack, "Bearer not found"); |
| 947 | goto err_out; |
| 948 | } |
| 949 | |
| 950 | err = __tipc_nl_add_bearer(&msg, bearer, 0); |
| 951 | if (err) |
| 952 | goto err_out; |
| 953 | rtnl_unlock(); |
| 954 | |
| 955 | return genlmsg_reply(rep, info); |
| 956 | err_out: |
| 957 | rtnl_unlock(); |
| 958 | nlmsg_free(rep); |
| 959 | |
| 960 | return err; |
| 961 | } |
| 962 | |
| 963 | int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) |
| 964 | { |
| 965 | int err; |
| 966 | char *name; |
| 967 | struct tipc_bearer *bearer; |
| 968 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 969 | struct net *net = sock_net(skb->sk); |
| 970 | |
| 971 | if (!info->attrs[TIPC_NLA_BEARER]) |
| 972 | return -EINVAL; |
| 973 | |
| 974 | err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, |
| 975 | info->attrs[TIPC_NLA_BEARER], |
| 976 | tipc_nl_bearer_policy, info->extack); |
| 977 | if (err) |
| 978 | return err; |
| 979 | |
| 980 | if (!attrs[TIPC_NLA_BEARER_NAME]) |
| 981 | return -EINVAL; |
| 982 | |
| 983 | name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| 984 | |
| 985 | bearer = tipc_bearer_find(net, name); |
| 986 | if (!bearer) { |
| 987 | NL_SET_ERR_MSG(info->extack, "Bearer not found"); |
| 988 | return -EINVAL; |
| 989 | } |
| 990 | |
| 991 | bearer_disable(net, bearer); |
| 992 | |
| 993 | return 0; |
| 994 | } |
| 995 | |
| 996 | int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) |
| 997 | { |
| 998 | int err; |
| 999 | |
| 1000 | rtnl_lock(); |
| 1001 | err = __tipc_nl_bearer_disable(skb, info); |
| 1002 | rtnl_unlock(); |
| 1003 | |
| 1004 | return err; |
| 1005 | } |
| 1006 | |
| 1007 | int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) |
| 1008 | { |
| 1009 | int err; |
| 1010 | char *bearer; |
| 1011 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 1012 | struct net *net = sock_net(skb->sk); |
| 1013 | u32 domain = 0; |
| 1014 | u32 prio; |
| 1015 | |
| 1016 | prio = TIPC_MEDIA_LINK_PRI; |
| 1017 | |
| 1018 | if (!info->attrs[TIPC_NLA_BEARER]) |
| 1019 | return -EINVAL; |
| 1020 | |
| 1021 | err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, |
| 1022 | info->attrs[TIPC_NLA_BEARER], |
| 1023 | tipc_nl_bearer_policy, info->extack); |
| 1024 | if (err) |
| 1025 | return err; |
| 1026 | |
| 1027 | if (!attrs[TIPC_NLA_BEARER_NAME]) |
| 1028 | return -EINVAL; |
| 1029 | |
| 1030 | bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| 1031 | |
| 1032 | if (attrs[TIPC_NLA_BEARER_DOMAIN]) |
| 1033 | domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); |
| 1034 | |
| 1035 | if (attrs[TIPC_NLA_BEARER_PROP]) { |
| 1036 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; |
| 1037 | |
| 1038 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], |
| 1039 | props); |
| 1040 | if (err) |
| 1041 | return err; |
| 1042 | |
| 1043 | if (props[TIPC_NLA_PROP_PRIO]) |
| 1044 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| 1045 | } |
| 1046 | |
| 1047 | return tipc_enable_bearer(net, bearer, domain, prio, attrs, |
| 1048 | info->extack); |
| 1049 | } |
| 1050 | |
| 1051 | int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) |
| 1052 | { |
| 1053 | int err; |
| 1054 | |
| 1055 | rtnl_lock(); |
| 1056 | err = __tipc_nl_bearer_enable(skb, info); |
| 1057 | rtnl_unlock(); |
| 1058 | |
| 1059 | return err; |
| 1060 | } |
| 1061 | |
| 1062 | int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info) |
| 1063 | { |
| 1064 | int err; |
| 1065 | char *name; |
| 1066 | struct tipc_bearer *b; |
| 1067 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 1068 | struct net *net = sock_net(skb->sk); |
| 1069 | |
| 1070 | if (!info->attrs[TIPC_NLA_BEARER]) |
| 1071 | return -EINVAL; |
| 1072 | |
| 1073 | err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, |
| 1074 | info->attrs[TIPC_NLA_BEARER], |
| 1075 | tipc_nl_bearer_policy, info->extack); |
| 1076 | if (err) |
| 1077 | return err; |
| 1078 | |
| 1079 | if (!attrs[TIPC_NLA_BEARER_NAME]) |
| 1080 | return -EINVAL; |
| 1081 | name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| 1082 | |
| 1083 | rtnl_lock(); |
| 1084 | b = tipc_bearer_find(net, name); |
| 1085 | if (!b) { |
| 1086 | NL_SET_ERR_MSG(info->extack, "Bearer not found"); |
| 1087 | err = -EINVAL; |
| 1088 | goto out; |
| 1089 | } |
| 1090 | |
| 1091 | #ifdef CONFIG_TIPC_MEDIA_UDP |
| 1092 | if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) { |
| 1093 | if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) { |
| 1094 | NL_SET_ERR_MSG(info->extack, "UDP option is unsupported"); |
| 1095 | err = -EINVAL; |
| 1096 | goto out; |
| 1097 | } |
| 1098 | |
| 1099 | err = tipc_udp_nl_bearer_add(b, |
| 1100 | attrs[TIPC_NLA_BEARER_UDP_OPTS]); |
| 1101 | } |
| 1102 | #endif |
| 1103 | out: |
| 1104 | rtnl_unlock(); |
| 1105 | |
| 1106 | return err; |
| 1107 | } |
| 1108 | |
| 1109 | int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) |
| 1110 | { |
| 1111 | struct tipc_bearer *b; |
| 1112 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 1113 | struct net *net = sock_net(skb->sk); |
| 1114 | char *name; |
| 1115 | int err; |
| 1116 | |
| 1117 | if (!info->attrs[TIPC_NLA_BEARER]) |
| 1118 | return -EINVAL; |
| 1119 | |
| 1120 | err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, |
| 1121 | info->attrs[TIPC_NLA_BEARER], |
| 1122 | tipc_nl_bearer_policy, info->extack); |
| 1123 | if (err) |
| 1124 | return err; |
| 1125 | |
| 1126 | if (!attrs[TIPC_NLA_BEARER_NAME]) |
| 1127 | return -EINVAL; |
| 1128 | name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| 1129 | |
| 1130 | b = tipc_bearer_find(net, name); |
| 1131 | if (!b) { |
| 1132 | NL_SET_ERR_MSG(info->extack, "Bearer not found"); |
| 1133 | return -EINVAL; |
| 1134 | } |
| 1135 | |
| 1136 | if (attrs[TIPC_NLA_BEARER_PROP]) { |
| 1137 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; |
| 1138 | |
| 1139 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], |
| 1140 | props); |
| 1141 | if (err) |
| 1142 | return err; |
| 1143 | |
| 1144 | if (props[TIPC_NLA_PROP_TOL]) { |
| 1145 | b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); |
| 1146 | tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL); |
| 1147 | } |
| 1148 | if (props[TIPC_NLA_PROP_PRIO]) |
| 1149 | b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| 1150 | if (props[TIPC_NLA_PROP_WIN]) |
| 1151 | b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
| 1152 | if (props[TIPC_NLA_PROP_MTU]) { |
| 1153 | if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) { |
| 1154 | NL_SET_ERR_MSG(info->extack, |
| 1155 | "MTU property is unsupported"); |
| 1156 | return -EINVAL; |
| 1157 | } |
| 1158 | #ifdef CONFIG_TIPC_MEDIA_UDP |
| 1159 | if (nla_get_u32(props[TIPC_NLA_PROP_MTU]) < |
| 1160 | b->encap_hlen + TIPC_MIN_BEARER_MTU) { |
| 1161 | NL_SET_ERR_MSG(info->extack, |
| 1162 | "MTU value is out-of-range"); |
| 1163 | return -EINVAL; |
| 1164 | } |
| 1165 | b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); |
| 1166 | tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU); |
| 1167 | #endif |
| 1168 | } |
| 1169 | } |
| 1170 | |
| 1171 | return 0; |
| 1172 | } |
| 1173 | |
| 1174 | int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) |
| 1175 | { |
| 1176 | int err; |
| 1177 | |
| 1178 | rtnl_lock(); |
| 1179 | err = __tipc_nl_bearer_set(skb, info); |
| 1180 | rtnl_unlock(); |
| 1181 | |
| 1182 | return err; |
| 1183 | } |
| 1184 | |
| 1185 | static int __tipc_nl_add_media(struct tipc_nl_msg *msg, |
| 1186 | struct tipc_media *media, int nlflags) |
| 1187 | { |
| 1188 | void *hdr; |
| 1189 | struct nlattr *attrs; |
| 1190 | struct nlattr *prop; |
| 1191 | |
| 1192 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
| 1193 | nlflags, TIPC_NL_MEDIA_GET); |
| 1194 | if (!hdr) |
| 1195 | return -EMSGSIZE; |
| 1196 | |
| 1197 | attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA); |
| 1198 | if (!attrs) |
| 1199 | goto msg_full; |
| 1200 | |
| 1201 | if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) |
| 1202 | goto attr_msg_full; |
| 1203 | |
| 1204 | prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP); |
| 1205 | if (!prop) |
| 1206 | goto prop_msg_full; |
| 1207 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) |
| 1208 | goto prop_msg_full; |
| 1209 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) |
| 1210 | goto prop_msg_full; |
| 1211 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win)) |
| 1212 | goto prop_msg_full; |
| 1213 | if (media->type_id == TIPC_MEDIA_TYPE_UDP) |
| 1214 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu)) |
| 1215 | goto prop_msg_full; |
| 1216 | |
| 1217 | nla_nest_end(msg->skb, prop); |
| 1218 | nla_nest_end(msg->skb, attrs); |
| 1219 | genlmsg_end(msg->skb, hdr); |
| 1220 | |
| 1221 | return 0; |
| 1222 | |
| 1223 | prop_msg_full: |
| 1224 | nla_nest_cancel(msg->skb, prop); |
| 1225 | attr_msg_full: |
| 1226 | nla_nest_cancel(msg->skb, attrs); |
| 1227 | msg_full: |
| 1228 | genlmsg_cancel(msg->skb, hdr); |
| 1229 | |
| 1230 | return -EMSGSIZE; |
| 1231 | } |
| 1232 | |
| 1233 | int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 1234 | { |
| 1235 | int err; |
| 1236 | int i = cb->args[0]; |
| 1237 | struct tipc_nl_msg msg; |
| 1238 | |
| 1239 | if (i == MAX_MEDIA) |
| 1240 | return 0; |
| 1241 | |
| 1242 | msg.skb = skb; |
| 1243 | msg.portid = NETLINK_CB(cb->skb).portid; |
| 1244 | msg.seq = cb->nlh->nlmsg_seq; |
| 1245 | |
| 1246 | rtnl_lock(); |
| 1247 | for (; media_info_array[i] != NULL; i++) { |
| 1248 | err = __tipc_nl_add_media(&msg, media_info_array[i], |
| 1249 | NLM_F_MULTI); |
| 1250 | if (err) |
| 1251 | break; |
| 1252 | } |
| 1253 | rtnl_unlock(); |
| 1254 | |
| 1255 | cb->args[0] = i; |
| 1256 | return skb->len; |
| 1257 | } |
| 1258 | |
| 1259 | int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) |
| 1260 | { |
| 1261 | int err; |
| 1262 | char *name; |
| 1263 | struct tipc_nl_msg msg; |
| 1264 | struct tipc_media *media; |
| 1265 | struct sk_buff *rep; |
| 1266 | struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1]; |
| 1267 | |
| 1268 | if (!info->attrs[TIPC_NLA_MEDIA]) |
| 1269 | return -EINVAL; |
| 1270 | |
| 1271 | err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX, |
| 1272 | info->attrs[TIPC_NLA_MEDIA], |
| 1273 | tipc_nl_media_policy, info->extack); |
| 1274 | if (err) |
| 1275 | return err; |
| 1276 | |
| 1277 | if (!attrs[TIPC_NLA_MEDIA_NAME]) |
| 1278 | return -EINVAL; |
| 1279 | name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); |
| 1280 | |
| 1281 | rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1282 | if (!rep) |
| 1283 | return -ENOMEM; |
| 1284 | |
| 1285 | msg.skb = rep; |
| 1286 | msg.portid = info->snd_portid; |
| 1287 | msg.seq = info->snd_seq; |
| 1288 | |
| 1289 | rtnl_lock(); |
| 1290 | media = tipc_media_find(name); |
| 1291 | if (!media) { |
| 1292 | NL_SET_ERR_MSG(info->extack, "Media not found"); |
| 1293 | err = -EINVAL; |
| 1294 | goto err_out; |
| 1295 | } |
| 1296 | |
| 1297 | err = __tipc_nl_add_media(&msg, media, 0); |
| 1298 | if (err) |
| 1299 | goto err_out; |
| 1300 | rtnl_unlock(); |
| 1301 | |
| 1302 | return genlmsg_reply(rep, info); |
| 1303 | err_out: |
| 1304 | rtnl_unlock(); |
| 1305 | nlmsg_free(rep); |
| 1306 | |
| 1307 | return err; |
| 1308 | } |
| 1309 | |
| 1310 | int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) |
| 1311 | { |
| 1312 | int err; |
| 1313 | char *name; |
| 1314 | struct tipc_media *m; |
| 1315 | struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1]; |
| 1316 | |
| 1317 | if (!info->attrs[TIPC_NLA_MEDIA]) |
| 1318 | return -EINVAL; |
| 1319 | |
| 1320 | err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX, |
| 1321 | info->attrs[TIPC_NLA_MEDIA], |
| 1322 | tipc_nl_media_policy, info->extack); |
| 1323 | |
| 1324 | if (!attrs[TIPC_NLA_MEDIA_NAME]) |
| 1325 | return -EINVAL; |
| 1326 | name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); |
| 1327 | |
| 1328 | m = tipc_media_find(name); |
| 1329 | if (!m) { |
| 1330 | NL_SET_ERR_MSG(info->extack, "Media not found"); |
| 1331 | return -EINVAL; |
| 1332 | } |
| 1333 | if (attrs[TIPC_NLA_MEDIA_PROP]) { |
| 1334 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; |
| 1335 | |
| 1336 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], |
| 1337 | props); |
| 1338 | if (err) |
| 1339 | return err; |
| 1340 | |
| 1341 | if (props[TIPC_NLA_PROP_TOL]) |
| 1342 | m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); |
| 1343 | if (props[TIPC_NLA_PROP_PRIO]) |
| 1344 | m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| 1345 | if (props[TIPC_NLA_PROP_WIN]) |
| 1346 | m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
| 1347 | if (props[TIPC_NLA_PROP_MTU]) { |
| 1348 | if (m->type_id != TIPC_MEDIA_TYPE_UDP) { |
| 1349 | NL_SET_ERR_MSG(info->extack, |
| 1350 | "MTU property is unsupported"); |
| 1351 | return -EINVAL; |
| 1352 | } |
| 1353 | #ifdef CONFIG_TIPC_MEDIA_UDP |
| 1354 | if (tipc_udp_mtu_bad(nla_get_u32 |
| 1355 | (props[TIPC_NLA_PROP_MTU]))) { |
| 1356 | NL_SET_ERR_MSG(info->extack, |
| 1357 | "MTU value is out-of-range"); |
| 1358 | return -EINVAL; |
| 1359 | } |
| 1360 | m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); |
| 1361 | #endif |
| 1362 | } |
| 1363 | } |
| 1364 | |
| 1365 | return 0; |
| 1366 | } |
| 1367 | |
| 1368 | int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) |
| 1369 | { |
| 1370 | int err; |
| 1371 | |
| 1372 | rtnl_lock(); |
| 1373 | err = __tipc_nl_media_set(skb, info); |
| 1374 | rtnl_unlock(); |
| 1375 | |
| 1376 | return err; |
| 1377 | } |