1 /* 2 * net/tipc/name_distr.c: TIPC name distribution code 3 * 4 * Copyright (c) 2000-2006, 2014, Ericsson AB 5 * Copyright (c) 2005, 2010-2011, 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 "core.h" 38 #include "link.h" 39 #include "name_distr.h" 40 41 int sysctl_tipc_named_timeout __read_mostly = 2000; 42 43 struct distr_queue_item { 44 struct distr_item i; 45 u32 dtype; 46 u32 node; 47 unsigned long expires; 48 struct list_head next; 49 }; 50 51 /** 52 * publ_to_item - add publication info to a publication message 53 * @p: publication info 54 * @i: location of item in the message 55 */ 56 static void publ_to_item(struct distr_item *i, struct publication *p) 57 { 58 i->type = htonl(p->type); 59 i->lower = htonl(p->lower); 60 i->upper = htonl(p->upper); 61 i->port = htonl(p->port); 62 i->key = htonl(p->key); 63 } 64 65 /** 66 * named_prepare_buf - allocate & initialize a publication message 67 * @net: the associated network namespace 68 * @type: message type 69 * @size: payload size 70 * @dest: destination node 71 * 72 * The buffer returned is of size INT_H_SIZE + payload size 73 */ 74 static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size, 75 u32 dest) 76 { 77 struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size, GFP_ATOMIC); 78 u32 self = tipc_own_addr(net); 79 struct tipc_msg *msg; 80 81 if (buf != NULL) { 82 msg = buf_msg(buf); 83 tipc_msg_init(self, msg, NAME_DISTRIBUTOR, 84 type, INT_H_SIZE, dest); 85 msg_set_size(msg, INT_H_SIZE + size); 86 } 87 return buf; 88 } 89 90 /** 91 * tipc_named_publish - tell other nodes about a new publication by this node 92 * @net: the associated network namespace 93 * @publ: the new publication 94 */ 95 struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ) 96 { 97 struct name_table *nt = tipc_name_table(net); 98 struct distr_item *item; 99 struct sk_buff *skb; 100 101 if (publ->scope == TIPC_NODE_SCOPE) { 102 list_add_tail_rcu(&publ->binding_node, &nt->node_scope); 103 return NULL; 104 } 105 write_lock_bh(&nt->cluster_scope_lock); 106 list_add_tail(&publ->binding_node, &nt->cluster_scope); 107 write_unlock_bh(&nt->cluster_scope_lock); 108 skb = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0); 109 if (!skb) { 110 pr_warn("Publication distribution failure\n"); 111 return NULL; 112 } 113 msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++); 114 msg_set_non_legacy(buf_msg(skb)); 115 item = (struct distr_item *)msg_data(buf_msg(skb)); 116 publ_to_item(item, publ); 117 return skb; 118 } 119 120 /** 121 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node 122 * @net: the associated network namespace 123 * @publ: the withdrawn publication 124 */ 125 struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ) 126 { 127 struct name_table *nt = tipc_name_table(net); 128 struct distr_item *item; 129 struct sk_buff *skb; 130 131 write_lock_bh(&nt->cluster_scope_lock); 132 list_del(&publ->binding_node); 133 write_unlock_bh(&nt->cluster_scope_lock); 134 if (publ->scope == TIPC_NODE_SCOPE) 135 return NULL; 136 137 skb = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0); 138 if (!skb) { 139 pr_warn("Withdrawal distribution failure\n"); 140 return NULL; 141 } 142 msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++); 143 msg_set_non_legacy(buf_msg(skb)); 144 item = (struct distr_item *)msg_data(buf_msg(skb)); 145 publ_to_item(item, publ); 146 return skb; 147 } 148 149 /** 150 * named_distribute - prepare name info for bulk distribution to another node 151 * @net: the associated network namespace 152 * @list: list of messages (buffers) to be returned from this function 153 * @dnode: node to be updated 154 * @pls: linked list of publication items to be packed into buffer chain 155 * @seqno: sequence number for this message 156 */ 157 static void named_distribute(struct net *net, struct sk_buff_head *list, 158 u32 dnode, struct list_head *pls, u16 seqno) 159 { 160 struct publication *publ; 161 struct sk_buff *skb = NULL; 162 struct distr_item *item = NULL; 163 u32 msg_dsz = ((tipc_node_get_mtu(net, dnode, 0, false) - INT_H_SIZE) / 164 ITEM_SIZE) * ITEM_SIZE; 165 u32 msg_rem = msg_dsz; 166 struct tipc_msg *hdr; 167 168 list_for_each_entry(publ, pls, binding_node) { 169 /* Prepare next buffer: */ 170 if (!skb) { 171 skb = named_prepare_buf(net, PUBLICATION, msg_rem, 172 dnode); 173 if (!skb) { 174 pr_warn("Bulk publication failure\n"); 175 return; 176 } 177 hdr = buf_msg(skb); 178 msg_set_bc_ack_invalid(hdr, true); 179 msg_set_bulk(hdr); 180 msg_set_non_legacy(hdr); 181 item = (struct distr_item *)msg_data(hdr); 182 } 183 184 /* Pack publication into message: */ 185 publ_to_item(item, publ); 186 item++; 187 msg_rem -= ITEM_SIZE; 188 189 /* Append full buffer to list: */ 190 if (!msg_rem) { 191 __skb_queue_tail(list, skb); 192 skb = NULL; 193 msg_rem = msg_dsz; 194 } 195 } 196 if (skb) { 197 hdr = buf_msg(skb); 198 msg_set_size(hdr, INT_H_SIZE + (msg_dsz - msg_rem)); 199 skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem)); 200 __skb_queue_tail(list, skb); 201 } 202 hdr = buf_msg(skb_peek_tail(list)); 203 msg_set_last_bulk(hdr); 204 msg_set_named_seqno(hdr, seqno); 205 } 206 207 /** 208 * tipc_named_node_up - tell specified node about all publications by this node 209 * @net: the associated network namespace 210 * @dnode: destination node 211 * @capabilities: peer node's capabilities 212 */ 213 void tipc_named_node_up(struct net *net, u32 dnode, u16 capabilities) 214 { 215 struct name_table *nt = tipc_name_table(net); 216 struct tipc_net *tn = tipc_net(net); 217 struct sk_buff_head head; 218 u16 seqno; 219 220 __skb_queue_head_init(&head); 221 spin_lock_bh(&tn->nametbl_lock); 222 if (!(capabilities & TIPC_NAMED_BCAST)) 223 nt->rc_dests++; 224 seqno = nt->snd_nxt; 225 spin_unlock_bh(&tn->nametbl_lock); 226 227 read_lock_bh(&nt->cluster_scope_lock); 228 named_distribute(net, &head, dnode, &nt->cluster_scope, seqno); 229 tipc_node_xmit(net, &head, dnode, 0); 230 read_unlock_bh(&nt->cluster_scope_lock); 231 } 232 233 /** 234 * tipc_publ_purge - remove publication associated with a failed node 235 * @net: the associated network namespace 236 * @publ: the publication to remove 237 * @addr: failed node's address 238 * 239 * Invoked for each publication issued by a newly failed node. 240 * Removes publication structure from name table & deletes it. 241 */ 242 static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr) 243 { 244 struct tipc_net *tn = tipc_net(net); 245 struct publication *p; 246 247 spin_lock_bh(&tn->nametbl_lock); 248 p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, publ->upper, 249 publ->node, publ->key); 250 if (p) 251 tipc_node_unsubscribe(net, &p->binding_node, addr); 252 spin_unlock_bh(&tn->nametbl_lock); 253 254 if (p != publ) { 255 pr_err("Unable to remove publication from failed node\n" 256 " (type=%u, lower=%u, node=0x%x, port=%u, key=%u)\n", 257 publ->type, publ->lower, publ->node, publ->port, 258 publ->key); 259 } 260 261 if (p) 262 kfree_rcu(p, rcu); 263 } 264 265 void tipc_publ_notify(struct net *net, struct list_head *nsub_list, 266 u32 addr, u16 capabilities) 267 { 268 struct name_table *nt = tipc_name_table(net); 269 struct tipc_net *tn = tipc_net(net); 270 271 struct publication *publ, *tmp; 272 273 list_for_each_entry_safe(publ, tmp, nsub_list, binding_node) 274 tipc_publ_purge(net, publ, addr); 275 spin_lock_bh(&tn->nametbl_lock); 276 if (!(capabilities & TIPC_NAMED_BCAST)) 277 nt->rc_dests--; 278 spin_unlock_bh(&tn->nametbl_lock); 279 } 280 281 /** 282 * tipc_update_nametbl - try to process a nametable update and notify 283 * subscribers 284 * @net: the associated network namespace 285 * @i: location of item in the message 286 * @node: node address 287 * @dtype: name distributor message type 288 * 289 * tipc_nametbl_lock must be held. 290 * Return: the publication item if successful, otherwise NULL. 291 */ 292 static bool tipc_update_nametbl(struct net *net, struct distr_item *i, 293 u32 node, u32 dtype) 294 { 295 struct publication *p = NULL; 296 u32 lower = ntohl(i->lower); 297 u32 upper = ntohl(i->upper); 298 u32 type = ntohl(i->type); 299 u32 port = ntohl(i->port); 300 u32 key = ntohl(i->key); 301 302 if (dtype == PUBLICATION) { 303 p = tipc_nametbl_insert_publ(net, type, lower, upper, 304 TIPC_CLUSTER_SCOPE, node, 305 port, key); 306 if (p) { 307 tipc_node_subscribe(net, &p->binding_node, node); 308 return true; 309 } 310 } else if (dtype == WITHDRAWAL) { 311 p = tipc_nametbl_remove_publ(net, type, lower, 312 upper, node, key); 313 if (p) { 314 tipc_node_unsubscribe(net, &p->binding_node, node); 315 kfree_rcu(p, rcu); 316 return true; 317 } 318 pr_warn_ratelimited("Failed to remove binding %u,%u from %x\n", 319 type, lower, node); 320 } else { 321 pr_warn("Unrecognized name table message received\n"); 322 } 323 return false; 324 } 325 326 static struct sk_buff *tipc_named_dequeue(struct sk_buff_head *namedq, 327 u16 *rcv_nxt, bool *open) 328 { 329 struct sk_buff *skb, *tmp; 330 struct tipc_msg *hdr; 331 u16 seqno; 332 333 spin_lock_bh(&namedq->lock); 334 skb_queue_walk_safe(namedq, skb, tmp) { 335 if (unlikely(skb_linearize(skb))) { 336 __skb_unlink(skb, namedq); 337 kfree_skb(skb); 338 continue; 339 } 340 hdr = buf_msg(skb); 341 seqno = msg_named_seqno(hdr); 342 if (msg_is_last_bulk(hdr)) { 343 *rcv_nxt = seqno; 344 *open = true; 345 } 346 347 if (msg_is_bulk(hdr) || msg_is_legacy(hdr)) { 348 __skb_unlink(skb, namedq); 349 spin_unlock_bh(&namedq->lock); 350 return skb; 351 } 352 353 if (*open && (*rcv_nxt == seqno)) { 354 (*rcv_nxt)++; 355 __skb_unlink(skb, namedq); 356 spin_unlock_bh(&namedq->lock); 357 return skb; 358 } 359 360 if (less(seqno, *rcv_nxt)) { 361 __skb_unlink(skb, namedq); 362 kfree_skb(skb); 363 continue; 364 } 365 } 366 spin_unlock_bh(&namedq->lock); 367 return NULL; 368 } 369 370 /** 371 * tipc_named_rcv - process name table update messages sent by another node 372 * @net: the associated network namespace 373 * @namedq: queue to receive from 374 * @rcv_nxt: store last received seqno here 375 * @open: last bulk msg was received (FIXME) 376 */ 377 void tipc_named_rcv(struct net *net, struct sk_buff_head *namedq, 378 u16 *rcv_nxt, bool *open) 379 { 380 struct tipc_net *tn = tipc_net(net); 381 struct distr_item *item; 382 struct tipc_msg *hdr; 383 struct sk_buff *skb; 384 u32 count, node; 385 386 spin_lock_bh(&tn->nametbl_lock); 387 while ((skb = tipc_named_dequeue(namedq, rcv_nxt, open))) { 388 hdr = buf_msg(skb); 389 node = msg_orignode(hdr); 390 item = (struct distr_item *)msg_data(hdr); 391 count = msg_data_sz(hdr) / ITEM_SIZE; 392 while (count--) { 393 tipc_update_nametbl(net, item, node, msg_type(hdr)); 394 item++; 395 } 396 kfree_skb(skb); 397 } 398 spin_unlock_bh(&tn->nametbl_lock); 399 } 400 401 /** 402 * tipc_named_reinit - re-initialize local publications 403 * @net: the associated network namespace 404 * 405 * This routine is called whenever TIPC networking is enabled. 406 * All name table entries published by this node are updated to reflect 407 * the node's new network address. 408 */ 409 void tipc_named_reinit(struct net *net) 410 { 411 struct name_table *nt = tipc_name_table(net); 412 struct tipc_net *tn = tipc_net(net); 413 struct publication *publ; 414 u32 self = tipc_own_addr(net); 415 416 spin_lock_bh(&tn->nametbl_lock); 417 418 list_for_each_entry_rcu(publ, &nt->node_scope, binding_node) 419 publ->node = self; 420 list_for_each_entry_rcu(publ, &nt->cluster_scope, binding_node) 421 publ->node = self; 422 nt->rc_dests = 0; 423 spin_unlock_bh(&tn->nametbl_lock); 424 } 425