| 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 | |
| 46 | #define MAX_ADDR_STR 60 |
| 47 | |
| 48 | static struct tipc_media * const media_info_array[] = { |
| 49 | ð_media_info, |
| 50 | #ifdef CONFIG_TIPC_MEDIA_IB |
| 51 | &ib_media_info, |
| 52 | #endif |
| 53 | #ifdef CONFIG_TIPC_MEDIA_UDP |
| 54 | &udp_media_info, |
| 55 | #endif |
| 56 | NULL |
| 57 | }; |
| 58 | |
| 59 | static void bearer_disable(struct net *net, struct tipc_bearer *b); |
| 60 | |
| 61 | /** |
| 62 | * tipc_media_find - locates specified media object by name |
| 63 | */ |
| 64 | struct tipc_media *tipc_media_find(const char *name) |
| 65 | { |
| 66 | u32 i; |
| 67 | |
| 68 | for (i = 0; media_info_array[i] != NULL; i++) { |
| 69 | if (!strcmp(media_info_array[i]->name, name)) |
| 70 | break; |
| 71 | } |
| 72 | return media_info_array[i]; |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * media_find_id - locates specified media object by type identifier |
| 77 | */ |
| 78 | static struct tipc_media *media_find_id(u8 type) |
| 79 | { |
| 80 | u32 i; |
| 81 | |
| 82 | for (i = 0; media_info_array[i] != NULL; i++) { |
| 83 | if (media_info_array[i]->type_id == type) |
| 84 | break; |
| 85 | } |
| 86 | return media_info_array[i]; |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * tipc_media_addr_printf - record media address in print buffer |
| 91 | */ |
| 92 | void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) |
| 93 | { |
| 94 | char addr_str[MAX_ADDR_STR]; |
| 95 | struct tipc_media *m; |
| 96 | int ret; |
| 97 | |
| 98 | m = media_find_id(a->media_id); |
| 99 | |
| 100 | if (m && !m->addr2str(a, addr_str, sizeof(addr_str))) |
| 101 | ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str); |
| 102 | else { |
| 103 | u32 i; |
| 104 | |
| 105 | ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); |
| 106 | for (i = 0; i < sizeof(a->value); i++) |
| 107 | ret += scnprintf(buf - ret, len + ret, |
| 108 | "-%02x", a->value[i]); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * bearer_name_validate - validate & (optionally) deconstruct bearer name |
| 114 | * @name: ptr to bearer name string |
| 115 | * @name_parts: ptr to area for bearer name components (or NULL if not needed) |
| 116 | * |
| 117 | * Returns 1 if bearer name is valid, otherwise 0. |
| 118 | */ |
| 119 | static int bearer_name_validate(const char *name, |
| 120 | struct tipc_bearer_names *name_parts) |
| 121 | { |
| 122 | char name_copy[TIPC_MAX_BEARER_NAME]; |
| 123 | char *media_name; |
| 124 | char *if_name; |
| 125 | u32 media_len; |
| 126 | u32 if_len; |
| 127 | |
| 128 | /* copy bearer name & ensure length is OK */ |
| 129 | name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; |
| 130 | /* need above in case non-Posix strncpy() doesn't pad with nulls */ |
| 131 | strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); |
| 132 | if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0) |
| 133 | return 0; |
| 134 | |
| 135 | /* ensure all component parts of bearer name are present */ |
| 136 | media_name = name_copy; |
| 137 | if_name = strchr(media_name, ':'); |
| 138 | if (if_name == NULL) |
| 139 | return 0; |
| 140 | *(if_name++) = 0; |
| 141 | media_len = if_name - media_name; |
| 142 | if_len = strlen(if_name) + 1; |
| 143 | |
| 144 | /* validate component parts of bearer name */ |
| 145 | if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || |
| 146 | (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) |
| 147 | return 0; |
| 148 | |
| 149 | /* return bearer name components, if necessary */ |
| 150 | if (name_parts) { |
| 151 | strcpy(name_parts->media_name, media_name); |
| 152 | strcpy(name_parts->if_name, if_name); |
| 153 | } |
| 154 | return 1; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * tipc_bearer_find - locates bearer object with matching bearer name |
| 159 | */ |
| 160 | struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) |
| 161 | { |
| 162 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 163 | struct tipc_bearer *b; |
| 164 | u32 i; |
| 165 | |
| 166 | for (i = 0; i < MAX_BEARERS; i++) { |
| 167 | b = rtnl_dereference(tn->bearer_list[i]); |
| 168 | if (b && (!strcmp(b->name, name))) |
| 169 | return b; |
| 170 | } |
| 171 | return NULL; |
| 172 | } |
| 173 | |
| 174 | /* tipc_bearer_get_name - get the bearer name from its id. |
| 175 | * @net: network namespace |
| 176 | * @name: a pointer to the buffer where the name will be stored. |
| 177 | * @bearer_id: the id to get the name from. |
| 178 | */ |
| 179 | int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id) |
| 180 | { |
| 181 | struct tipc_net *tn = tipc_net(net); |
| 182 | struct tipc_bearer *b; |
| 183 | |
| 184 | if (bearer_id >= MAX_BEARERS) |
| 185 | return -EINVAL; |
| 186 | |
| 187 | b = rtnl_dereference(tn->bearer_list[bearer_id]); |
| 188 | if (!b) |
| 189 | return -EINVAL; |
| 190 | |
| 191 | strcpy(name, b->name); |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) |
| 196 | { |
| 197 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 198 | struct tipc_bearer *b; |
| 199 | |
| 200 | rcu_read_lock(); |
| 201 | b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); |
| 202 | if (b) |
| 203 | tipc_disc_add_dest(b->link_req); |
| 204 | rcu_read_unlock(); |
| 205 | } |
| 206 | |
| 207 | void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) |
| 208 | { |
| 209 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 210 | struct tipc_bearer *b; |
| 211 | |
| 212 | rcu_read_lock(); |
| 213 | b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); |
| 214 | if (b) |
| 215 | tipc_disc_remove_dest(b->link_req); |
| 216 | rcu_read_unlock(); |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * tipc_enable_bearer - enable bearer with the given name |
| 221 | */ |
| 222 | static int tipc_enable_bearer(struct net *net, const char *name, |
| 223 | u32 disc_domain, u32 priority, |
| 224 | struct nlattr *attr[]) |
| 225 | { |
| 226 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 227 | struct tipc_bearer *b; |
| 228 | struct tipc_media *m; |
| 229 | struct tipc_bearer_names b_names; |
| 230 | struct sk_buff *skb; |
| 231 | char addr_string[16]; |
| 232 | u32 bearer_id; |
| 233 | u32 with_this_prio; |
| 234 | u32 i; |
| 235 | int res = -EINVAL; |
| 236 | |
| 237 | if (!tn->own_addr) { |
| 238 | pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", |
| 239 | name); |
| 240 | return -ENOPROTOOPT; |
| 241 | } |
| 242 | if (!bearer_name_validate(name, &b_names)) { |
| 243 | pr_warn("Bearer <%s> rejected, illegal name\n", name); |
| 244 | return -EINVAL; |
| 245 | } |
| 246 | if (tipc_addr_domain_valid(disc_domain) && |
| 247 | (disc_domain != tn->own_addr)) { |
| 248 | if (tipc_in_scope(disc_domain, tn->own_addr)) { |
| 249 | disc_domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK; |
| 250 | res = 0; /* accept any node in own cluster */ |
| 251 | } else if (in_own_cluster_exact(net, disc_domain)) |
| 252 | res = 0; /* accept specified node in own cluster */ |
| 253 | } |
| 254 | if (res) { |
| 255 | pr_warn("Bearer <%s> rejected, illegal discovery domain\n", |
| 256 | name); |
| 257 | return -EINVAL; |
| 258 | } |
| 259 | if ((priority > TIPC_MAX_LINK_PRI) && |
| 260 | (priority != TIPC_MEDIA_LINK_PRI)) { |
| 261 | pr_warn("Bearer <%s> rejected, illegal priority\n", name); |
| 262 | return -EINVAL; |
| 263 | } |
| 264 | |
| 265 | m = tipc_media_find(b_names.media_name); |
| 266 | if (!m) { |
| 267 | pr_warn("Bearer <%s> rejected, media <%s> not registered\n", |
| 268 | name, b_names.media_name); |
| 269 | return -EINVAL; |
| 270 | } |
| 271 | |
| 272 | if (priority == TIPC_MEDIA_LINK_PRI) |
| 273 | priority = m->priority; |
| 274 | |
| 275 | restart: |
| 276 | bearer_id = MAX_BEARERS; |
| 277 | with_this_prio = 1; |
| 278 | for (i = MAX_BEARERS; i-- != 0; ) { |
| 279 | b = rtnl_dereference(tn->bearer_list[i]); |
| 280 | if (!b) { |
| 281 | bearer_id = i; |
| 282 | continue; |
| 283 | } |
| 284 | if (!strcmp(name, b->name)) { |
| 285 | pr_warn("Bearer <%s> rejected, already enabled\n", |
| 286 | name); |
| 287 | return -EINVAL; |
| 288 | } |
| 289 | if ((b->priority == priority) && |
| 290 | (++with_this_prio > 2)) { |
| 291 | if (priority-- == 0) { |
| 292 | pr_warn("Bearer <%s> rejected, duplicate priority\n", |
| 293 | name); |
| 294 | return -EINVAL; |
| 295 | } |
| 296 | pr_warn("Bearer <%s> priority adjustment required %u->%u\n", |
| 297 | name, priority + 1, priority); |
| 298 | goto restart; |
| 299 | } |
| 300 | } |
| 301 | if (bearer_id >= MAX_BEARERS) { |
| 302 | pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", |
| 303 | name, MAX_BEARERS); |
| 304 | return -EINVAL; |
| 305 | } |
| 306 | |
| 307 | b = kzalloc(sizeof(*b), GFP_ATOMIC); |
| 308 | if (!b) |
| 309 | return -ENOMEM; |
| 310 | |
| 311 | strcpy(b->name, name); |
| 312 | b->media = m; |
| 313 | res = m->enable_media(net, b, attr); |
| 314 | if (res) { |
| 315 | pr_warn("Bearer <%s> rejected, enable failure (%d)\n", |
| 316 | name, -res); |
| 317 | return -EINVAL; |
| 318 | } |
| 319 | |
| 320 | b->identity = bearer_id; |
| 321 | b->tolerance = m->tolerance; |
| 322 | b->window = m->window; |
| 323 | b->domain = disc_domain; |
| 324 | b->net_plane = bearer_id + 'A'; |
| 325 | b->priority = priority; |
| 326 | |
| 327 | res = tipc_disc_create(net, b, &b->bcast_addr, &skb); |
| 328 | if (res) { |
| 329 | bearer_disable(net, b); |
| 330 | pr_warn("Bearer <%s> rejected, discovery object creation failed\n", |
| 331 | name); |
| 332 | return -EINVAL; |
| 333 | } |
| 334 | |
| 335 | rcu_assign_pointer(tn->bearer_list[bearer_id], b); |
| 336 | if (skb) |
| 337 | tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); |
| 338 | |
| 339 | if (tipc_mon_create(net, bearer_id)) |
| 340 | return -ENOMEM; |
| 341 | |
| 342 | pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", |
| 343 | name, |
| 344 | tipc_addr_string_fill(addr_string, disc_domain), priority); |
| 345 | return res; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * tipc_reset_bearer - Reset all links established over this bearer |
| 350 | */ |
| 351 | static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) |
| 352 | { |
| 353 | pr_info("Resetting bearer <%s>\n", b->name); |
| 354 | tipc_node_delete_links(net, b->identity); |
| 355 | tipc_disc_reset(net, b); |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | /* tipc_bearer_reset_all - reset all links on all bearers |
| 360 | */ |
| 361 | void tipc_bearer_reset_all(struct net *net) |
| 362 | { |
| 363 | struct tipc_net *tn = tipc_net(net); |
| 364 | struct tipc_bearer *b; |
| 365 | int i; |
| 366 | |
| 367 | for (i = 0; i < MAX_BEARERS; i++) { |
| 368 | b = rcu_dereference_rtnl(tn->bearer_list[i]); |
| 369 | if (b) |
| 370 | tipc_reset_bearer(net, b); |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | /** |
| 375 | * bearer_disable |
| 376 | * |
| 377 | * Note: This routine assumes caller holds RTNL lock. |
| 378 | */ |
| 379 | static void bearer_disable(struct net *net, struct tipc_bearer *b) |
| 380 | { |
| 381 | struct tipc_net *tn = tipc_net(net); |
| 382 | int bearer_id = b->identity; |
| 383 | |
| 384 | pr_info("Disabling bearer <%s>\n", b->name); |
| 385 | b->media->disable_media(b); |
| 386 | tipc_node_delete_links(net, bearer_id); |
| 387 | RCU_INIT_POINTER(b->media_ptr, NULL); |
| 388 | if (b->link_req) |
| 389 | tipc_disc_delete(b->link_req); |
| 390 | RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); |
| 391 | kfree_rcu(b, rcu); |
| 392 | tipc_mon_delete(net, bearer_id); |
| 393 | } |
| 394 | |
| 395 | int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, |
| 396 | struct nlattr *attr[]) |
| 397 | { |
| 398 | struct net_device *dev; |
| 399 | char *driver_name = strchr((const char *)b->name, ':') + 1; |
| 400 | |
| 401 | /* Find device with specified name */ |
| 402 | dev = dev_get_by_name(net, driver_name); |
| 403 | if (!dev) |
| 404 | return -ENODEV; |
| 405 | |
| 406 | /* Associate TIPC bearer with L2 bearer */ |
| 407 | rcu_assign_pointer(b->media_ptr, dev); |
| 408 | memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); |
| 409 | memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); |
| 410 | b->bcast_addr.media_id = b->media->type_id; |
| 411 | b->bcast_addr.broadcast = 1; |
| 412 | b->mtu = dev->mtu; |
| 413 | b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr); |
| 414 | rcu_assign_pointer(dev->tipc_ptr, b); |
| 415 | return 0; |
| 416 | } |
| 417 | |
| 418 | /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface |
| 419 | * |
| 420 | * Mark L2 bearer as inactive so that incoming buffers are thrown away |
| 421 | */ |
| 422 | void tipc_disable_l2_media(struct tipc_bearer *b) |
| 423 | { |
| 424 | struct net_device *dev; |
| 425 | |
| 426 | dev = (struct net_device *)rtnl_dereference(b->media_ptr); |
| 427 | RCU_INIT_POINTER(dev->tipc_ptr, NULL); |
| 428 | synchronize_net(); |
| 429 | dev_put(dev); |
| 430 | } |
| 431 | |
| 432 | /** |
| 433 | * tipc_l2_send_msg - send a TIPC packet out over an L2 interface |
| 434 | * @skb: the packet to be sent |
| 435 | * @b: the bearer through which the packet is to be sent |
| 436 | * @dest: peer destination address |
| 437 | */ |
| 438 | int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, |
| 439 | struct tipc_bearer *b, struct tipc_media_addr *dest) |
| 440 | { |
| 441 | struct net_device *dev; |
| 442 | int delta; |
| 443 | void *tipc_ptr; |
| 444 | |
| 445 | dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); |
| 446 | if (!dev) |
| 447 | return 0; |
| 448 | |
| 449 | /* Send RESET message even if bearer is detached from device */ |
| 450 | tipc_ptr = rcu_dereference_rtnl(dev->tipc_ptr); |
| 451 | if (unlikely(!tipc_ptr && !msg_is_reset(buf_msg(skb)))) |
| 452 | goto drop; |
| 453 | |
| 454 | delta = dev->hard_header_len - skb_headroom(skb); |
| 455 | if ((delta > 0) && |
| 456 | pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) |
| 457 | goto drop; |
| 458 | |
| 459 | skb_reset_network_header(skb); |
| 460 | skb->dev = dev; |
| 461 | skb->protocol = htons(ETH_P_TIPC); |
| 462 | dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, |
| 463 | dev->dev_addr, skb->len); |
| 464 | dev_queue_xmit(skb); |
| 465 | return 0; |
| 466 | drop: |
| 467 | kfree_skb(skb); |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | int tipc_bearer_mtu(struct net *net, u32 bearer_id) |
| 472 | { |
| 473 | int mtu = 0; |
| 474 | struct tipc_bearer *b; |
| 475 | |
| 476 | rcu_read_lock(); |
| 477 | b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]); |
| 478 | if (b) |
| 479 | mtu = b->mtu; |
| 480 | rcu_read_unlock(); |
| 481 | return mtu; |
| 482 | } |
| 483 | |
| 484 | /* tipc_bearer_xmit_skb - sends buffer to destination over bearer |
| 485 | */ |
| 486 | void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, |
| 487 | struct sk_buff *skb, |
| 488 | struct tipc_media_addr *dest) |
| 489 | { |
| 490 | struct tipc_net *tn = tipc_net(net); |
| 491 | struct tipc_bearer *b; |
| 492 | |
| 493 | rcu_read_lock(); |
| 494 | b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); |
| 495 | if (likely(b)) |
| 496 | b->media->send_msg(net, skb, b, dest); |
| 497 | else |
| 498 | kfree_skb(skb); |
| 499 | rcu_read_unlock(); |
| 500 | } |
| 501 | |
| 502 | /* tipc_bearer_xmit() -send buffer to destination over bearer |
| 503 | */ |
| 504 | void tipc_bearer_xmit(struct net *net, u32 bearer_id, |
| 505 | struct sk_buff_head *xmitq, |
| 506 | struct tipc_media_addr *dst) |
| 507 | { |
| 508 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 509 | struct tipc_bearer *b; |
| 510 | struct sk_buff *skb, *tmp; |
| 511 | |
| 512 | if (skb_queue_empty(xmitq)) |
| 513 | return; |
| 514 | |
| 515 | rcu_read_lock(); |
| 516 | b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); |
| 517 | if (unlikely(!b)) |
| 518 | __skb_queue_purge(xmitq); |
| 519 | skb_queue_walk_safe(xmitq, skb, tmp) { |
| 520 | __skb_dequeue(xmitq); |
| 521 | b->media->send_msg(net, skb, b, dst); |
| 522 | } |
| 523 | rcu_read_unlock(); |
| 524 | } |
| 525 | |
| 526 | /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations |
| 527 | */ |
| 528 | void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, |
| 529 | struct sk_buff_head *xmitq) |
| 530 | { |
| 531 | struct tipc_net *tn = tipc_net(net); |
| 532 | int net_id = tn->net_id; |
| 533 | struct tipc_bearer *b; |
| 534 | struct sk_buff *skb, *tmp; |
| 535 | struct tipc_msg *hdr; |
| 536 | |
| 537 | rcu_read_lock(); |
| 538 | b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]); |
| 539 | if (unlikely(!b)) |
| 540 | __skb_queue_purge(xmitq); |
| 541 | skb_queue_walk_safe(xmitq, skb, tmp) { |
| 542 | hdr = buf_msg(skb); |
| 543 | msg_set_non_seq(hdr, 1); |
| 544 | msg_set_mc_netid(hdr, net_id); |
| 545 | __skb_dequeue(xmitq); |
| 546 | b->media->send_msg(net, skb, b, &b->bcast_addr); |
| 547 | } |
| 548 | rcu_read_unlock(); |
| 549 | } |
| 550 | |
| 551 | /** |
| 552 | * tipc_l2_rcv_msg - handle incoming TIPC message from an interface |
| 553 | * @buf: the received packet |
| 554 | * @dev: the net device that the packet was received on |
| 555 | * @pt: the packet_type structure which was used to register this handler |
| 556 | * @orig_dev: the original receive net device in case the device is a bond |
| 557 | * |
| 558 | * Accept only packets explicitly sent to this node, or broadcast packets; |
| 559 | * ignores packets sent using interface multicast, and traffic sent to other |
| 560 | * nodes (which can happen if interface is running in promiscuous mode). |
| 561 | */ |
| 562 | static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, |
| 563 | struct packet_type *pt, struct net_device *orig_dev) |
| 564 | { |
| 565 | struct tipc_bearer *b; |
| 566 | |
| 567 | rcu_read_lock(); |
| 568 | b = rcu_dereference_rtnl(dev->tipc_ptr); |
| 569 | if (likely(b && (skb->pkt_type <= PACKET_BROADCAST))) { |
| 570 | skb->next = NULL; |
| 571 | tipc_rcv(dev_net(dev), skb, b); |
| 572 | rcu_read_unlock(); |
| 573 | return NET_RX_SUCCESS; |
| 574 | } |
| 575 | rcu_read_unlock(); |
| 576 | kfree_skb(skb); |
| 577 | return NET_RX_DROP; |
| 578 | } |
| 579 | |
| 580 | /** |
| 581 | * tipc_l2_device_event - handle device events from network device |
| 582 | * @nb: the context of the notification |
| 583 | * @evt: the type of event |
| 584 | * @ptr: the net device that the event was on |
| 585 | * |
| 586 | * This function is called by the Ethernet driver in case of link |
| 587 | * change event. |
| 588 | */ |
| 589 | static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, |
| 590 | void *ptr) |
| 591 | { |
| 592 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 593 | struct net *net = dev_net(dev); |
| 594 | struct tipc_net *tn = tipc_net(net); |
| 595 | struct tipc_bearer *b; |
| 596 | int i; |
| 597 | |
| 598 | b = rtnl_dereference(dev->tipc_ptr); |
| 599 | if (!b) { |
| 600 | for (i = 0; i < MAX_BEARERS; b = NULL, i++) { |
| 601 | b = rtnl_dereference(tn->bearer_list[i]); |
| 602 | if (b && (b->media_ptr == dev)) |
| 603 | break; |
| 604 | } |
| 605 | } |
| 606 | if (!b) |
| 607 | return NOTIFY_DONE; |
| 608 | |
| 609 | b->mtu = dev->mtu; |
| 610 | |
| 611 | switch (evt) { |
| 612 | case NETDEV_CHANGE: |
| 613 | if (netif_carrier_ok(dev)) |
| 614 | break; |
| 615 | case NETDEV_UP: |
| 616 | rcu_assign_pointer(dev->tipc_ptr, b); |
| 617 | break; |
| 618 | case NETDEV_GOING_DOWN: |
| 619 | RCU_INIT_POINTER(dev->tipc_ptr, NULL); |
| 620 | synchronize_net(); |
| 621 | tipc_reset_bearer(net, b); |
| 622 | break; |
| 623 | case NETDEV_CHANGEMTU: |
| 624 | tipc_reset_bearer(net, b); |
| 625 | break; |
| 626 | case NETDEV_CHANGEADDR: |
| 627 | b->media->raw2addr(b, &b->addr, |
| 628 | (char *)dev->dev_addr); |
| 629 | tipc_reset_bearer(net, b); |
| 630 | break; |
| 631 | case NETDEV_UNREGISTER: |
| 632 | case NETDEV_CHANGENAME: |
| 633 | bearer_disable(dev_net(dev), b); |
| 634 | break; |
| 635 | } |
| 636 | return NOTIFY_OK; |
| 637 | } |
| 638 | |
| 639 | static struct packet_type tipc_packet_type __read_mostly = { |
| 640 | .type = htons(ETH_P_TIPC), |
| 641 | .func = tipc_l2_rcv_msg, |
| 642 | }; |
| 643 | |
| 644 | static struct notifier_block notifier = { |
| 645 | .notifier_call = tipc_l2_device_event, |
| 646 | .priority = 0, |
| 647 | }; |
| 648 | |
| 649 | int tipc_bearer_setup(void) |
| 650 | { |
| 651 | int err; |
| 652 | |
| 653 | err = register_netdevice_notifier(¬ifier); |
| 654 | if (err) |
| 655 | return err; |
| 656 | dev_add_pack(&tipc_packet_type); |
| 657 | return 0; |
| 658 | } |
| 659 | |
| 660 | void tipc_bearer_cleanup(void) |
| 661 | { |
| 662 | unregister_netdevice_notifier(¬ifier); |
| 663 | dev_remove_pack(&tipc_packet_type); |
| 664 | } |
| 665 | |
| 666 | void tipc_bearer_stop(struct net *net) |
| 667 | { |
| 668 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 669 | struct tipc_bearer *b; |
| 670 | u32 i; |
| 671 | |
| 672 | for (i = 0; i < MAX_BEARERS; i++) { |
| 673 | b = rtnl_dereference(tn->bearer_list[i]); |
| 674 | if (b) { |
| 675 | bearer_disable(net, b); |
| 676 | tn->bearer_list[i] = NULL; |
| 677 | } |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | /* Caller should hold rtnl_lock to protect the bearer */ |
| 682 | static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, |
| 683 | struct tipc_bearer *bearer, int nlflags) |
| 684 | { |
| 685 | void *hdr; |
| 686 | struct nlattr *attrs; |
| 687 | struct nlattr *prop; |
| 688 | |
| 689 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
| 690 | nlflags, TIPC_NL_BEARER_GET); |
| 691 | if (!hdr) |
| 692 | return -EMSGSIZE; |
| 693 | |
| 694 | attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER); |
| 695 | if (!attrs) |
| 696 | goto msg_full; |
| 697 | |
| 698 | if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) |
| 699 | goto attr_msg_full; |
| 700 | |
| 701 | prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP); |
| 702 | if (!prop) |
| 703 | goto prop_msg_full; |
| 704 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) |
| 705 | goto prop_msg_full; |
| 706 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) |
| 707 | goto prop_msg_full; |
| 708 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window)) |
| 709 | goto prop_msg_full; |
| 710 | |
| 711 | nla_nest_end(msg->skb, prop); |
| 712 | nla_nest_end(msg->skb, attrs); |
| 713 | genlmsg_end(msg->skb, hdr); |
| 714 | |
| 715 | return 0; |
| 716 | |
| 717 | prop_msg_full: |
| 718 | nla_nest_cancel(msg->skb, prop); |
| 719 | attr_msg_full: |
| 720 | nla_nest_cancel(msg->skb, attrs); |
| 721 | msg_full: |
| 722 | genlmsg_cancel(msg->skb, hdr); |
| 723 | |
| 724 | return -EMSGSIZE; |
| 725 | } |
| 726 | |
| 727 | int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 728 | { |
| 729 | int err; |
| 730 | int i = cb->args[0]; |
| 731 | struct tipc_bearer *bearer; |
| 732 | struct tipc_nl_msg msg; |
| 733 | struct net *net = sock_net(skb->sk); |
| 734 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 735 | |
| 736 | if (i == MAX_BEARERS) |
| 737 | return 0; |
| 738 | |
| 739 | msg.skb = skb; |
| 740 | msg.portid = NETLINK_CB(cb->skb).portid; |
| 741 | msg.seq = cb->nlh->nlmsg_seq; |
| 742 | |
| 743 | rtnl_lock(); |
| 744 | for (i = 0; i < MAX_BEARERS; i++) { |
| 745 | bearer = rtnl_dereference(tn->bearer_list[i]); |
| 746 | if (!bearer) |
| 747 | continue; |
| 748 | |
| 749 | err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); |
| 750 | if (err) |
| 751 | break; |
| 752 | } |
| 753 | rtnl_unlock(); |
| 754 | |
| 755 | cb->args[0] = i; |
| 756 | return skb->len; |
| 757 | } |
| 758 | |
| 759 | int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) |
| 760 | { |
| 761 | int err; |
| 762 | char *name; |
| 763 | struct sk_buff *rep; |
| 764 | struct tipc_bearer *bearer; |
| 765 | struct tipc_nl_msg msg; |
| 766 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 767 | struct net *net = genl_info_net(info); |
| 768 | |
| 769 | if (!info->attrs[TIPC_NLA_BEARER]) |
| 770 | return -EINVAL; |
| 771 | |
| 772 | err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, |
| 773 | info->attrs[TIPC_NLA_BEARER], |
| 774 | tipc_nl_bearer_policy); |
| 775 | if (err) |
| 776 | return err; |
| 777 | |
| 778 | if (!attrs[TIPC_NLA_BEARER_NAME]) |
| 779 | return -EINVAL; |
| 780 | name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| 781 | |
| 782 | rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 783 | if (!rep) |
| 784 | return -ENOMEM; |
| 785 | |
| 786 | msg.skb = rep; |
| 787 | msg.portid = info->snd_portid; |
| 788 | msg.seq = info->snd_seq; |
| 789 | |
| 790 | rtnl_lock(); |
| 791 | bearer = tipc_bearer_find(net, name); |
| 792 | if (!bearer) { |
| 793 | err = -EINVAL; |
| 794 | goto err_out; |
| 795 | } |
| 796 | |
| 797 | err = __tipc_nl_add_bearer(&msg, bearer, 0); |
| 798 | if (err) |
| 799 | goto err_out; |
| 800 | rtnl_unlock(); |
| 801 | |
| 802 | return genlmsg_reply(rep, info); |
| 803 | err_out: |
| 804 | rtnl_unlock(); |
| 805 | nlmsg_free(rep); |
| 806 | |
| 807 | return err; |
| 808 | } |
| 809 | |
| 810 | int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) |
| 811 | { |
| 812 | int err; |
| 813 | char *name; |
| 814 | struct tipc_bearer *bearer; |
| 815 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 816 | struct net *net = sock_net(skb->sk); |
| 817 | |
| 818 | if (!info->attrs[TIPC_NLA_BEARER]) |
| 819 | return -EINVAL; |
| 820 | |
| 821 | err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, |
| 822 | info->attrs[TIPC_NLA_BEARER], |
| 823 | tipc_nl_bearer_policy); |
| 824 | if (err) |
| 825 | return err; |
| 826 | |
| 827 | if (!attrs[TIPC_NLA_BEARER_NAME]) |
| 828 | return -EINVAL; |
| 829 | |
| 830 | name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| 831 | |
| 832 | rtnl_lock(); |
| 833 | bearer = tipc_bearer_find(net, name); |
| 834 | if (!bearer) { |
| 835 | rtnl_unlock(); |
| 836 | return -EINVAL; |
| 837 | } |
| 838 | |
| 839 | bearer_disable(net, bearer); |
| 840 | rtnl_unlock(); |
| 841 | |
| 842 | return 0; |
| 843 | } |
| 844 | |
| 845 | int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) |
| 846 | { |
| 847 | int err; |
| 848 | char *bearer; |
| 849 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 850 | struct net *net = sock_net(skb->sk); |
| 851 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 852 | u32 domain; |
| 853 | u32 prio; |
| 854 | |
| 855 | prio = TIPC_MEDIA_LINK_PRI; |
| 856 | domain = tn->own_addr & TIPC_ZONE_CLUSTER_MASK; |
| 857 | |
| 858 | if (!info->attrs[TIPC_NLA_BEARER]) |
| 859 | return -EINVAL; |
| 860 | |
| 861 | err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, |
| 862 | info->attrs[TIPC_NLA_BEARER], |
| 863 | tipc_nl_bearer_policy); |
| 864 | if (err) |
| 865 | return err; |
| 866 | |
| 867 | if (!attrs[TIPC_NLA_BEARER_NAME]) |
| 868 | return -EINVAL; |
| 869 | |
| 870 | bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| 871 | |
| 872 | if (attrs[TIPC_NLA_BEARER_DOMAIN]) |
| 873 | domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); |
| 874 | |
| 875 | if (attrs[TIPC_NLA_BEARER_PROP]) { |
| 876 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; |
| 877 | |
| 878 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], |
| 879 | props); |
| 880 | if (err) |
| 881 | return err; |
| 882 | |
| 883 | if (props[TIPC_NLA_PROP_PRIO]) |
| 884 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| 885 | } |
| 886 | |
| 887 | rtnl_lock(); |
| 888 | err = tipc_enable_bearer(net, bearer, domain, prio, attrs); |
| 889 | if (err) { |
| 890 | rtnl_unlock(); |
| 891 | return err; |
| 892 | } |
| 893 | rtnl_unlock(); |
| 894 | |
| 895 | return 0; |
| 896 | } |
| 897 | |
| 898 | int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) |
| 899 | { |
| 900 | int err; |
| 901 | char *name; |
| 902 | struct tipc_bearer *b; |
| 903 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 904 | struct net *net = sock_net(skb->sk); |
| 905 | |
| 906 | if (!info->attrs[TIPC_NLA_BEARER]) |
| 907 | return -EINVAL; |
| 908 | |
| 909 | err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX, |
| 910 | info->attrs[TIPC_NLA_BEARER], |
| 911 | tipc_nl_bearer_policy); |
| 912 | if (err) |
| 913 | return err; |
| 914 | |
| 915 | if (!attrs[TIPC_NLA_BEARER_NAME]) |
| 916 | return -EINVAL; |
| 917 | name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| 918 | |
| 919 | rtnl_lock(); |
| 920 | b = tipc_bearer_find(net, name); |
| 921 | if (!b) { |
| 922 | rtnl_unlock(); |
| 923 | return -EINVAL; |
| 924 | } |
| 925 | |
| 926 | if (attrs[TIPC_NLA_BEARER_PROP]) { |
| 927 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; |
| 928 | |
| 929 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], |
| 930 | props); |
| 931 | if (err) { |
| 932 | rtnl_unlock(); |
| 933 | return err; |
| 934 | } |
| 935 | |
| 936 | if (props[TIPC_NLA_PROP_TOL]) |
| 937 | b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); |
| 938 | if (props[TIPC_NLA_PROP_PRIO]) |
| 939 | b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| 940 | if (props[TIPC_NLA_PROP_WIN]) |
| 941 | b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
| 942 | } |
| 943 | rtnl_unlock(); |
| 944 | |
| 945 | return 0; |
| 946 | } |
| 947 | |
| 948 | static int __tipc_nl_add_media(struct tipc_nl_msg *msg, |
| 949 | struct tipc_media *media, int nlflags) |
| 950 | { |
| 951 | void *hdr; |
| 952 | struct nlattr *attrs; |
| 953 | struct nlattr *prop; |
| 954 | |
| 955 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
| 956 | nlflags, TIPC_NL_MEDIA_GET); |
| 957 | if (!hdr) |
| 958 | return -EMSGSIZE; |
| 959 | |
| 960 | attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA); |
| 961 | if (!attrs) |
| 962 | goto msg_full; |
| 963 | |
| 964 | if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) |
| 965 | goto attr_msg_full; |
| 966 | |
| 967 | prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP); |
| 968 | if (!prop) |
| 969 | goto prop_msg_full; |
| 970 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) |
| 971 | goto prop_msg_full; |
| 972 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) |
| 973 | goto prop_msg_full; |
| 974 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window)) |
| 975 | goto prop_msg_full; |
| 976 | |
| 977 | nla_nest_end(msg->skb, prop); |
| 978 | nla_nest_end(msg->skb, attrs); |
| 979 | genlmsg_end(msg->skb, hdr); |
| 980 | |
| 981 | return 0; |
| 982 | |
| 983 | prop_msg_full: |
| 984 | nla_nest_cancel(msg->skb, prop); |
| 985 | attr_msg_full: |
| 986 | nla_nest_cancel(msg->skb, attrs); |
| 987 | msg_full: |
| 988 | genlmsg_cancel(msg->skb, hdr); |
| 989 | |
| 990 | return -EMSGSIZE; |
| 991 | } |
| 992 | |
| 993 | int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| 994 | { |
| 995 | int err; |
| 996 | int i = cb->args[0]; |
| 997 | struct tipc_nl_msg msg; |
| 998 | |
| 999 | if (i == MAX_MEDIA) |
| 1000 | return 0; |
| 1001 | |
| 1002 | msg.skb = skb; |
| 1003 | msg.portid = NETLINK_CB(cb->skb).portid; |
| 1004 | msg.seq = cb->nlh->nlmsg_seq; |
| 1005 | |
| 1006 | rtnl_lock(); |
| 1007 | for (; media_info_array[i] != NULL; i++) { |
| 1008 | err = __tipc_nl_add_media(&msg, media_info_array[i], |
| 1009 | NLM_F_MULTI); |
| 1010 | if (err) |
| 1011 | break; |
| 1012 | } |
| 1013 | rtnl_unlock(); |
| 1014 | |
| 1015 | cb->args[0] = i; |
| 1016 | return skb->len; |
| 1017 | } |
| 1018 | |
| 1019 | int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) |
| 1020 | { |
| 1021 | int err; |
| 1022 | char *name; |
| 1023 | struct tipc_nl_msg msg; |
| 1024 | struct tipc_media *media; |
| 1025 | struct sk_buff *rep; |
| 1026 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 1027 | |
| 1028 | if (!info->attrs[TIPC_NLA_MEDIA]) |
| 1029 | return -EINVAL; |
| 1030 | |
| 1031 | err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, |
| 1032 | info->attrs[TIPC_NLA_MEDIA], |
| 1033 | tipc_nl_media_policy); |
| 1034 | if (err) |
| 1035 | return err; |
| 1036 | |
| 1037 | if (!attrs[TIPC_NLA_MEDIA_NAME]) |
| 1038 | return -EINVAL; |
| 1039 | name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); |
| 1040 | |
| 1041 | rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1042 | if (!rep) |
| 1043 | return -ENOMEM; |
| 1044 | |
| 1045 | msg.skb = rep; |
| 1046 | msg.portid = info->snd_portid; |
| 1047 | msg.seq = info->snd_seq; |
| 1048 | |
| 1049 | rtnl_lock(); |
| 1050 | media = tipc_media_find(name); |
| 1051 | if (!media) { |
| 1052 | err = -EINVAL; |
| 1053 | goto err_out; |
| 1054 | } |
| 1055 | |
| 1056 | err = __tipc_nl_add_media(&msg, media, 0); |
| 1057 | if (err) |
| 1058 | goto err_out; |
| 1059 | rtnl_unlock(); |
| 1060 | |
| 1061 | return genlmsg_reply(rep, info); |
| 1062 | err_out: |
| 1063 | rtnl_unlock(); |
| 1064 | nlmsg_free(rep); |
| 1065 | |
| 1066 | return err; |
| 1067 | } |
| 1068 | |
| 1069 | int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) |
| 1070 | { |
| 1071 | int err; |
| 1072 | char *name; |
| 1073 | struct tipc_media *m; |
| 1074 | struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| 1075 | |
| 1076 | if (!info->attrs[TIPC_NLA_MEDIA]) |
| 1077 | return -EINVAL; |
| 1078 | |
| 1079 | err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX, |
| 1080 | info->attrs[TIPC_NLA_MEDIA], |
| 1081 | tipc_nl_media_policy); |
| 1082 | |
| 1083 | if (!attrs[TIPC_NLA_MEDIA_NAME]) |
| 1084 | return -EINVAL; |
| 1085 | name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); |
| 1086 | |
| 1087 | rtnl_lock(); |
| 1088 | m = tipc_media_find(name); |
| 1089 | if (!m) { |
| 1090 | rtnl_unlock(); |
| 1091 | return -EINVAL; |
| 1092 | } |
| 1093 | |
| 1094 | if (attrs[TIPC_NLA_MEDIA_PROP]) { |
| 1095 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; |
| 1096 | |
| 1097 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], |
| 1098 | props); |
| 1099 | if (err) { |
| 1100 | rtnl_unlock(); |
| 1101 | return err; |
| 1102 | } |
| 1103 | |
| 1104 | if (props[TIPC_NLA_PROP_TOL]) |
| 1105 | m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); |
| 1106 | if (props[TIPC_NLA_PROP_PRIO]) |
| 1107 | m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| 1108 | if (props[TIPC_NLA_PROP_WIN]) |
| 1109 | m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
| 1110 | } |
| 1111 | rtnl_unlock(); |
| 1112 | |
| 1113 | return 0; |
| 1114 | } |