1 /* 2 * net/tipc/discover.c 3 * 4 * Copyright (c) 2003-2006, Ericsson AB 5 * Copyright (c) 2005-2006, 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 "dbg.h" 39 #include "link.h" 40 #include "zone.h" 41 #include "discover.h" 42 #include "port.h" 43 #include "name_table.h" 44 45 #define TIPC_LINK_REQ_INIT 125 /* min delay during bearer start up */ 46 #define TIPC_LINK_REQ_FAST 2000 /* normal delay if bearer has no links */ 47 #define TIPC_LINK_REQ_SLOW 600000 /* normal delay if bearer has links */ 48 49 #if 0 50 #define GET_NODE_INFO 300 51 #define GET_NODE_INFO_RESULT 301 52 #define FORWARD_LINK_PROBE 302 53 #define LINK_REQUEST_REJECTED 303 54 #define LINK_REQUEST_ACCEPTED 304 55 #define DROP_LINK_REQUEST 305 56 #define CHECK_LINK_COUNT 306 57 #endif 58 59 /* 60 * TODO: Most of the inter-cluster setup stuff should be 61 * rewritten, and be made conformant with specification. 62 */ 63 64 65 /** 66 * struct link_req - information about an ongoing link setup request 67 * @bearer: bearer issuing requests 68 * @dest: destination address for request messages 69 * @buf: request message to be (repeatedly) sent 70 * @timer: timer governing period between requests 71 * @timer_intv: current interval between requests (in ms) 72 */ 73 struct link_req { 74 struct bearer *bearer; 75 struct tipc_media_addr dest; 76 struct sk_buff *buf; 77 struct timer_list timer; 78 unsigned int timer_intv; 79 }; 80 81 82 #if 0 83 int disc_create_link(const struct tipc_link_create *argv) 84 { 85 /* 86 * Code for inter cluster link setup here 87 */ 88 return TIPC_OK; 89 } 90 #endif 91 92 /* 93 * disc_lost_link(): A link has lost contact 94 */ 95 96 void tipc_disc_link_event(u32 addr, char *name, int up) 97 { 98 if (in_own_cluster(addr)) 99 return; 100 /* 101 * Code for inter cluster link setup here 102 */ 103 } 104 105 /** 106 * tipc_disc_init_msg - initialize a link setup message 107 * @type: message type (request or response) 108 * @req_links: number of links associated with message 109 * @dest_domain: network domain of node(s) which should respond to message 110 * @b_ptr: ptr to bearer issuing message 111 */ 112 113 static struct sk_buff *tipc_disc_init_msg(u32 type, 114 u32 req_links, 115 u32 dest_domain, 116 struct bearer *b_ptr) 117 { 118 struct sk_buff *buf = buf_acquire(DSC_H_SIZE); 119 struct tipc_msg *msg; 120 121 if (buf) { 122 msg = buf_msg(buf); 123 tipc_msg_init(msg, LINK_CONFIG, type, DSC_H_SIZE, dest_domain); 124 msg_set_non_seq(msg, 1); 125 msg_set_req_links(msg, req_links); 126 msg_set_dest_domain(msg, dest_domain); 127 msg_set_bc_netid(msg, tipc_net_id); 128 msg_set_media_addr(msg, &b_ptr->publ.addr); 129 } 130 return buf; 131 } 132 133 /** 134 * disc_dupl_alert - issue node address duplication alert 135 * @b_ptr: pointer to bearer detecting duplication 136 * @node_addr: duplicated node address 137 * @media_addr: media address advertised by duplicated node 138 */ 139 140 static void disc_dupl_alert(struct bearer *b_ptr, u32 node_addr, 141 struct tipc_media_addr *media_addr) 142 { 143 char node_addr_str[16]; 144 char media_addr_str[64]; 145 struct print_buf pb; 146 147 tipc_addr_string_fill(node_addr_str, node_addr); 148 tipc_printbuf_init(&pb, media_addr_str, sizeof(media_addr_str)); 149 tipc_media_addr_printf(&pb, media_addr); 150 tipc_printbuf_validate(&pb); 151 warn("Duplicate %s using %s seen on <%s>\n", 152 node_addr_str, media_addr_str, b_ptr->publ.name); 153 } 154 155 /** 156 * tipc_disc_recv_msg - handle incoming link setup message (request or response) 157 * @buf: buffer containing message 158 * @b_ptr: bearer that message arrived on 159 */ 160 161 void tipc_disc_recv_msg(struct sk_buff *buf, struct bearer *b_ptr) 162 { 163 struct link *link; 164 struct tipc_media_addr media_addr; 165 struct tipc_msg *msg = buf_msg(buf); 166 u32 dest = msg_dest_domain(msg); 167 u32 orig = msg_prevnode(msg); 168 u32 net_id = msg_bc_netid(msg); 169 u32 type = msg_type(msg); 170 171 msg_get_media_addr(msg,&media_addr); 172 msg_dbg(msg, "RECV:"); 173 buf_discard(buf); 174 175 if (net_id != tipc_net_id) 176 return; 177 if (!tipc_addr_domain_valid(dest)) 178 return; 179 if (!tipc_addr_node_valid(orig)) 180 return; 181 if (orig == tipc_own_addr) { 182 if (memcmp(&media_addr, &b_ptr->publ.addr, sizeof(media_addr))) 183 disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr); 184 return; 185 } 186 if (!tipc_in_scope(dest, tipc_own_addr)) 187 return; 188 if (is_slave(tipc_own_addr) && is_slave(orig)) 189 return; 190 if (is_slave(orig) && !in_own_cluster(orig)) 191 return; 192 if (in_own_cluster(orig)) { 193 /* Always accept link here */ 194 struct sk_buff *rbuf; 195 struct tipc_media_addr *addr; 196 struct tipc_node *n_ptr = tipc_node_find(orig); 197 int link_fully_up; 198 199 dbg(" in own cluster\n"); 200 if (n_ptr == NULL) { 201 n_ptr = tipc_node_create(orig); 202 if (!n_ptr) 203 return; 204 } 205 spin_lock_bh(&n_ptr->lock); 206 link = n_ptr->links[b_ptr->identity]; 207 if (!link) { 208 dbg("creating link\n"); 209 link = tipc_link_create(b_ptr, orig, &media_addr); 210 if (!link) { 211 spin_unlock_bh(&n_ptr->lock); 212 return; 213 } 214 } 215 addr = &link->media_addr; 216 if (memcmp(addr, &media_addr, sizeof(*addr))) { 217 if (tipc_link_is_up(link) || (!link->started)) { 218 disc_dupl_alert(b_ptr, orig, &media_addr); 219 spin_unlock_bh(&n_ptr->lock); 220 return; 221 } 222 warn("Resetting link <%s>, peer interface address changed\n", 223 link->name); 224 memcpy(addr, &media_addr, sizeof(*addr)); 225 tipc_link_reset(link); 226 } 227 link_fully_up = link_working_working(link); 228 spin_unlock_bh(&n_ptr->lock); 229 if ((type == DSC_RESP_MSG) || link_fully_up) 230 return; 231 rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr); 232 if (rbuf != NULL) { 233 msg_dbg(buf_msg(rbuf),"SEND:"); 234 b_ptr->media->send_msg(rbuf, &b_ptr->publ, &media_addr); 235 buf_discard(rbuf); 236 } 237 } 238 } 239 240 /** 241 * tipc_disc_stop_link_req - stop sending periodic link setup requests 242 * @req: ptr to link request structure 243 */ 244 245 void tipc_disc_stop_link_req(struct link_req *req) 246 { 247 if (!req) 248 return; 249 250 k_cancel_timer(&req->timer); 251 k_term_timer(&req->timer); 252 buf_discard(req->buf); 253 kfree(req); 254 } 255 256 /** 257 * tipc_disc_update_link_req - update frequency of periodic link setup requests 258 * @req: ptr to link request structure 259 */ 260 261 void tipc_disc_update_link_req(struct link_req *req) 262 { 263 if (!req) 264 return; 265 266 if (req->timer_intv == TIPC_LINK_REQ_SLOW) { 267 if (!req->bearer->nodes.count) { 268 req->timer_intv = TIPC_LINK_REQ_FAST; 269 k_start_timer(&req->timer, req->timer_intv); 270 } 271 } else if (req->timer_intv == TIPC_LINK_REQ_FAST) { 272 if (req->bearer->nodes.count) { 273 req->timer_intv = TIPC_LINK_REQ_SLOW; 274 k_start_timer(&req->timer, req->timer_intv); 275 } 276 } else { 277 /* leave timer "as is" if haven't yet reached a "normal" rate */ 278 } 279 } 280 281 /** 282 * disc_timeout - send a periodic link setup request 283 * @req: ptr to link request structure 284 * 285 * Called whenever a link setup request timer associated with a bearer expires. 286 */ 287 288 static void disc_timeout(struct link_req *req) 289 { 290 spin_lock_bh(&req->bearer->publ.lock); 291 292 req->bearer->media->send_msg(req->buf, &req->bearer->publ, &req->dest); 293 294 if ((req->timer_intv == TIPC_LINK_REQ_SLOW) || 295 (req->timer_intv == TIPC_LINK_REQ_FAST)) { 296 /* leave timer interval "as is" if already at a "normal" rate */ 297 } else { 298 req->timer_intv *= 2; 299 if (req->timer_intv > TIPC_LINK_REQ_FAST) 300 req->timer_intv = TIPC_LINK_REQ_FAST; 301 if ((req->timer_intv == TIPC_LINK_REQ_FAST) && 302 (req->bearer->nodes.count)) 303 req->timer_intv = TIPC_LINK_REQ_SLOW; 304 } 305 k_start_timer(&req->timer, req->timer_intv); 306 307 spin_unlock_bh(&req->bearer->publ.lock); 308 } 309 310 /** 311 * tipc_disc_init_link_req - start sending periodic link setup requests 312 * @b_ptr: ptr to bearer issuing requests 313 * @dest: destination address for request messages 314 * @dest_domain: network domain of node(s) which should respond to message 315 * @req_links: max number of desired links 316 * 317 * Returns pointer to link request structure, or NULL if unable to create. 318 */ 319 320 struct link_req *tipc_disc_init_link_req(struct bearer *b_ptr, 321 const struct tipc_media_addr *dest, 322 u32 dest_domain, 323 u32 req_links) 324 { 325 struct link_req *req; 326 327 req = kmalloc(sizeof(*req), GFP_ATOMIC); 328 if (!req) 329 return NULL; 330 331 req->buf = tipc_disc_init_msg(DSC_REQ_MSG, req_links, dest_domain, b_ptr); 332 if (!req->buf) { 333 kfree(req); 334 return NULL; 335 } 336 337 memcpy(&req->dest, dest, sizeof(*dest)); 338 req->bearer = b_ptr; 339 req->timer_intv = TIPC_LINK_REQ_INIT; 340 k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req); 341 k_start_timer(&req->timer, req->timer_intv); 342 return req; 343 } 344 345