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 */ 54 static void publ_to_item(struct distr_item *i, struct publication *p) 55 { 56 i->type = htonl(p->type); 57 i->lower = htonl(p->lower); 58 i->upper = htonl(p->upper); 59 i->port = htonl(p->port); 60 i->key = htonl(p->key); 61 } 62 63 /** 64 * named_prepare_buf - allocate & initialize a publication message 65 * 66 * The buffer returned is of size INT_H_SIZE + payload size 67 */ 68 static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size, 69 u32 dest) 70 { 71 struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size, GFP_ATOMIC); 72 u32 self = tipc_own_addr(net); 73 struct tipc_msg *msg; 74 75 if (buf != NULL) { 76 msg = buf_msg(buf); 77 tipc_msg_init(self, msg, NAME_DISTRIBUTOR, 78 type, INT_H_SIZE, dest); 79 msg_set_size(msg, INT_H_SIZE + size); 80 } 81 return buf; 82 } 83 84 /** 85 * tipc_named_publish - tell other nodes about a new publication by this node 86 */ 87 struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ) 88 { 89 struct name_table *nt = tipc_name_table(net); 90 struct distr_item *item; 91 struct sk_buff *skb; 92 93 if (publ->scope == TIPC_NODE_SCOPE) { 94 list_add_tail_rcu(&publ->binding_node, &nt->node_scope); 95 return NULL; 96 } 97 write_lock_bh(&nt->cluster_scope_lock); 98 list_add_tail(&publ->binding_node, &nt->cluster_scope); 99 write_unlock_bh(&nt->cluster_scope_lock); 100 skb = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0); 101 if (!skb) { 102 pr_warn("Publication distribution failure\n"); 103 return NULL; 104 } 105 106 item = (struct distr_item *)msg_data(buf_msg(skb)); 107 publ_to_item(item, publ); 108 return skb; 109 } 110 111 /** 112 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node 113 */ 114 struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ) 115 { 116 struct name_table *nt = tipc_name_table(net); 117 struct sk_buff *buf; 118 struct distr_item *item; 119 120 write_lock_bh(&nt->cluster_scope_lock); 121 list_del(&publ->binding_node); 122 write_unlock_bh(&nt->cluster_scope_lock); 123 if (publ->scope == TIPC_NODE_SCOPE) 124 return NULL; 125 126 buf = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0); 127 if (!buf) { 128 pr_warn("Withdrawal distribution failure\n"); 129 return NULL; 130 } 131 132 item = (struct distr_item *)msg_data(buf_msg(buf)); 133 publ_to_item(item, publ); 134 return buf; 135 } 136 137 /** 138 * named_distribute - prepare name info for bulk distribution to another node 139 * @list: list of messages (buffers) to be returned from this function 140 * @dnode: node to be updated 141 * @pls: linked list of publication items to be packed into buffer chain 142 */ 143 static void named_distribute(struct net *net, struct sk_buff_head *list, 144 u32 dnode, struct list_head *pls) 145 { 146 struct publication *publ; 147 struct sk_buff *skb = NULL; 148 struct distr_item *item = NULL; 149 u32 msg_dsz = ((tipc_node_get_mtu(net, dnode, 0) - INT_H_SIZE) / 150 ITEM_SIZE) * ITEM_SIZE; 151 u32 msg_rem = msg_dsz; 152 153 list_for_each_entry(publ, pls, binding_node) { 154 /* Prepare next buffer: */ 155 if (!skb) { 156 skb = named_prepare_buf(net, PUBLICATION, msg_rem, 157 dnode); 158 if (!skb) { 159 pr_warn("Bulk publication failure\n"); 160 return; 161 } 162 msg_set_bc_ack_invalid(buf_msg(skb), true); 163 item = (struct distr_item *)msg_data(buf_msg(skb)); 164 } 165 166 /* Pack publication into message: */ 167 publ_to_item(item, publ); 168 item++; 169 msg_rem -= ITEM_SIZE; 170 171 /* Append full buffer to list: */ 172 if (!msg_rem) { 173 __skb_queue_tail(list, skb); 174 skb = NULL; 175 msg_rem = msg_dsz; 176 } 177 } 178 if (skb) { 179 msg_set_size(buf_msg(skb), INT_H_SIZE + (msg_dsz - msg_rem)); 180 skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem)); 181 __skb_queue_tail(list, skb); 182 } 183 } 184 185 /** 186 * tipc_named_node_up - tell specified node about all publications by this node 187 */ 188 void tipc_named_node_up(struct net *net, u32 dnode) 189 { 190 struct name_table *nt = tipc_name_table(net); 191 struct sk_buff_head head; 192 193 __skb_queue_head_init(&head); 194 195 read_lock_bh(&nt->cluster_scope_lock); 196 named_distribute(net, &head, dnode, &nt->cluster_scope); 197 tipc_node_xmit(net, &head, dnode, 0); 198 read_unlock_bh(&nt->cluster_scope_lock); 199 } 200 201 /** 202 * tipc_publ_purge - remove publication associated with a failed node 203 * 204 * Invoked for each publication issued by a newly failed node. 205 * Removes publication structure from name table & deletes it. 206 */ 207 static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr) 208 { 209 struct tipc_net *tn = tipc_net(net); 210 struct publication *p; 211 212 spin_lock_bh(&tn->nametbl_lock); 213 p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, publ->upper, 214 publ->node, publ->key); 215 if (p) 216 tipc_node_unsubscribe(net, &p->binding_node, addr); 217 spin_unlock_bh(&tn->nametbl_lock); 218 219 if (p != publ) { 220 pr_err("Unable to remove publication from failed node\n" 221 " (type=%u, lower=%u, node=0x%x, port=%u, key=%u)\n", 222 publ->type, publ->lower, publ->node, publ->port, 223 publ->key); 224 } 225 226 if (p) 227 kfree_rcu(p, rcu); 228 } 229 230 /** 231 * tipc_dist_queue_purge - remove deferred updates from a node that went down 232 */ 233 static void tipc_dist_queue_purge(struct net *net, u32 addr) 234 { 235 struct tipc_net *tn = net_generic(net, tipc_net_id); 236 struct distr_queue_item *e, *tmp; 237 238 spin_lock_bh(&tn->nametbl_lock); 239 list_for_each_entry_safe(e, tmp, &tn->dist_queue, next) { 240 if (e->node != addr) 241 continue; 242 list_del(&e->next); 243 kfree(e); 244 } 245 spin_unlock_bh(&tn->nametbl_lock); 246 } 247 248 void tipc_publ_notify(struct net *net, struct list_head *nsub_list, u32 addr) 249 { 250 struct publication *publ, *tmp; 251 252 list_for_each_entry_safe(publ, tmp, nsub_list, binding_node) 253 tipc_publ_purge(net, publ, addr); 254 tipc_dist_queue_purge(net, addr); 255 } 256 257 /** 258 * tipc_update_nametbl - try to process a nametable update and notify 259 * subscribers 260 * 261 * tipc_nametbl_lock must be held. 262 * Returns the publication item if successful, otherwise NULL. 263 */ 264 static bool tipc_update_nametbl(struct net *net, struct distr_item *i, 265 u32 node, u32 dtype) 266 { 267 struct publication *p = NULL; 268 u32 lower = ntohl(i->lower); 269 u32 upper = ntohl(i->upper); 270 u32 type = ntohl(i->type); 271 u32 port = ntohl(i->port); 272 u32 key = ntohl(i->key); 273 274 if (dtype == PUBLICATION) { 275 p = tipc_nametbl_insert_publ(net, type, lower, upper, 276 TIPC_CLUSTER_SCOPE, node, 277 port, key); 278 if (p) { 279 tipc_node_subscribe(net, &p->binding_node, node); 280 return true; 281 } 282 } else if (dtype == WITHDRAWAL) { 283 p = tipc_nametbl_remove_publ(net, type, lower, 284 upper, node, key); 285 if (p) { 286 tipc_node_unsubscribe(net, &p->binding_node, node); 287 kfree_rcu(p, rcu); 288 return true; 289 } 290 pr_warn_ratelimited("Failed to remove binding %u,%u from %x\n", 291 type, lower, node); 292 } else { 293 pr_warn("Unrecognized name table message received\n"); 294 } 295 return false; 296 } 297 298 /** 299 * tipc_named_rcv - process name table update messages sent by another node 300 */ 301 void tipc_named_rcv(struct net *net, struct sk_buff_head *inputq) 302 { 303 struct tipc_net *tn = net_generic(net, tipc_net_id); 304 struct tipc_msg *msg; 305 struct distr_item *item; 306 uint count; 307 u32 node; 308 struct sk_buff *skb; 309 int mtype; 310 311 spin_lock_bh(&tn->nametbl_lock); 312 for (skb = skb_dequeue(inputq); skb; skb = skb_dequeue(inputq)) { 313 skb_linearize(skb); 314 msg = buf_msg(skb); 315 mtype = msg_type(msg); 316 item = (struct distr_item *)msg_data(msg); 317 count = msg_data_sz(msg) / ITEM_SIZE; 318 node = msg_orignode(msg); 319 while (count--) { 320 tipc_update_nametbl(net, item, node, mtype); 321 item++; 322 } 323 kfree_skb(skb); 324 } 325 spin_unlock_bh(&tn->nametbl_lock); 326 } 327 328 /** 329 * tipc_named_reinit - re-initialize local publications 330 * 331 * This routine is called whenever TIPC networking is enabled. 332 * All name table entries published by this node are updated to reflect 333 * the node's new network address. 334 */ 335 void tipc_named_reinit(struct net *net) 336 { 337 struct name_table *nt = tipc_name_table(net); 338 struct tipc_net *tn = tipc_net(net); 339 struct publication *publ; 340 u32 self = tipc_own_addr(net); 341 342 spin_lock_bh(&tn->nametbl_lock); 343 344 list_for_each_entry_rcu(publ, &nt->node_scope, binding_node) 345 publ->node = self; 346 list_for_each_entry_rcu(publ, &nt->cluster_scope, binding_node) 347 publ->node = self; 348 349 spin_unlock_bh(&tn->nametbl_lock); 350 } 351