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106 publ_to_item(item, publ); 107 return skb; 108 } 109 110 /** 111 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node 112 */ 113 struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ) 114 { 115 struct sk_buff *buf; 116 struct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