4 * Copyright (c) 2003-2006, Ericsson AB
5 * Copyright (c) 2005-2006, Wind River Systems
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43 #include "name_table.h"
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 */
50 * TODO: Most of the inter-cluster setup stuff should be
51 * rewritten, and be made conformant with specification.
56 * struct link_req - information about an ongoing link setup request
57 * @bearer: bearer issuing requests
58 * @dest: destination address for request messages
59 * @buf: request message to be (repeatedly) sent
60 * @timer: timer governing period between requests
61 * @timer_intv: current interval between requests (in ms)
64 struct bearer *bearer;
65 struct tipc_media_addr dest;
67 struct timer_list timer;
68 unsigned int timer_intv;
73 * disc_lost_link(): A link has lost contact
76 void tipc_disc_link_event(u32 addr, char *name, int up)
78 if (in_own_cluster(addr))
81 * Code for inter cluster link setup here
86 * tipc_disc_init_msg - initialize a link setup message
87 * @type: message type (request or response)
88 * @req_links: number of links associated with message
89 * @dest_domain: network domain of node(s) which should respond to message
90 * @b_ptr: ptr to bearer issuing message
93 static struct sk_buff *tipc_disc_init_msg(u32 type,
98 struct sk_buff *buf = buf_acquire(DSC_H_SIZE);
103 tipc_msg_init(msg, LINK_CONFIG, type, DSC_H_SIZE, dest_domain);
104 msg_set_non_seq(msg, 1);
105 msg_set_req_links(msg, req_links);
106 msg_set_dest_domain(msg, dest_domain);
107 msg_set_bc_netid(msg, tipc_net_id);
108 msg_set_media_addr(msg, &b_ptr->publ.addr);
114 * disc_dupl_alert - issue node address duplication alert
115 * @b_ptr: pointer to bearer detecting duplication
116 * @node_addr: duplicated node address
117 * @media_addr: media address advertised by duplicated node
120 static void disc_dupl_alert(struct bearer *b_ptr, u32 node_addr,
121 struct tipc_media_addr *media_addr)
123 char node_addr_str[16];
124 char media_addr_str[64];
127 tipc_addr_string_fill(node_addr_str, node_addr);
128 tipc_printbuf_init(&pb, media_addr_str, sizeof(media_addr_str));
129 tipc_media_addr_printf(&pb, media_addr);
130 tipc_printbuf_validate(&pb);
131 warn("Duplicate %s using %s seen on <%s>\n",
132 node_addr_str, media_addr_str, b_ptr->publ.name);
136 * tipc_disc_recv_msg - handle incoming link setup message (request or response)
137 * @buf: buffer containing message
138 * @b_ptr: bearer that message arrived on
141 void tipc_disc_recv_msg(struct sk_buff *buf, struct bearer *b_ptr)
144 struct tipc_media_addr media_addr;
145 struct tipc_msg *msg = buf_msg(buf);
146 u32 dest = msg_dest_domain(msg);
147 u32 orig = msg_prevnode(msg);
148 u32 net_id = msg_bc_netid(msg);
149 u32 type = msg_type(msg);
151 msg_get_media_addr(msg,&media_addr);
152 msg_dbg(msg, "RECV:");
155 if (net_id != tipc_net_id)
157 if (!tipc_addr_domain_valid(dest))
159 if (!tipc_addr_node_valid(orig))
161 if (orig == tipc_own_addr) {
162 if (memcmp(&media_addr, &b_ptr->publ.addr, sizeof(media_addr)))
163 disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr);
166 if (!tipc_in_scope(dest, tipc_own_addr))
168 if (is_slave(tipc_own_addr) && is_slave(orig))
170 if (is_slave(orig) && !in_own_cluster(orig))
172 if (in_own_cluster(orig)) {
173 /* Always accept link here */
174 struct sk_buff *rbuf;
175 struct tipc_media_addr *addr;
176 struct tipc_node *n_ptr = tipc_node_find(orig);
179 dbg(" in own cluster\n");
181 n_ptr = tipc_node_create(orig);
185 spin_lock_bh(&n_ptr->lock);
187 /* Don't talk to neighbor during cleanup after last session */
189 if (n_ptr->cleanup_required) {
190 spin_unlock_bh(&n_ptr->lock);
194 link = n_ptr->links[b_ptr->identity];
196 dbg("creating link\n");
197 link = tipc_link_create(b_ptr, orig, &media_addr);
199 spin_unlock_bh(&n_ptr->lock);
203 addr = &link->media_addr;
204 if (memcmp(addr, &media_addr, sizeof(*addr))) {
205 if (tipc_link_is_up(link) || (!link->started)) {
206 disc_dupl_alert(b_ptr, orig, &media_addr);
207 spin_unlock_bh(&n_ptr->lock);
210 warn("Resetting link <%s>, peer interface address changed\n",
212 memcpy(addr, &media_addr, sizeof(*addr));
213 tipc_link_reset(link);
215 link_fully_up = link_working_working(link);
216 spin_unlock_bh(&n_ptr->lock);
217 if ((type == DSC_RESP_MSG) || link_fully_up)
219 rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr);
221 msg_dbg(buf_msg(rbuf),"SEND:");
222 b_ptr->media->send_msg(rbuf, &b_ptr->publ, &media_addr);
229 * tipc_disc_stop_link_req - stop sending periodic link setup requests
230 * @req: ptr to link request structure
233 void tipc_disc_stop_link_req(struct link_req *req)
238 k_cancel_timer(&req->timer);
239 k_term_timer(&req->timer);
240 buf_discard(req->buf);
245 * tipc_disc_update_link_req - update frequency of periodic link setup requests
246 * @req: ptr to link request structure
249 void tipc_disc_update_link_req(struct link_req *req)
254 if (req->timer_intv == TIPC_LINK_REQ_SLOW) {
255 if (!req->bearer->nodes.count) {
256 req->timer_intv = TIPC_LINK_REQ_FAST;
257 k_start_timer(&req->timer, req->timer_intv);
259 } else if (req->timer_intv == TIPC_LINK_REQ_FAST) {
260 if (req->bearer->nodes.count) {
261 req->timer_intv = TIPC_LINK_REQ_SLOW;
262 k_start_timer(&req->timer, req->timer_intv);
265 /* leave timer "as is" if haven't yet reached a "normal" rate */
270 * disc_timeout - send a periodic link setup request
271 * @req: ptr to link request structure
273 * Called whenever a link setup request timer associated with a bearer expires.
276 static void disc_timeout(struct link_req *req)
278 spin_lock_bh(&req->bearer->publ.lock);
280 req->bearer->media->send_msg(req->buf, &req->bearer->publ, &req->dest);
282 if ((req->timer_intv == TIPC_LINK_REQ_SLOW) ||
283 (req->timer_intv == TIPC_LINK_REQ_FAST)) {
284 /* leave timer interval "as is" if already at a "normal" rate */
286 req->timer_intv *= 2;
287 if (req->timer_intv > TIPC_LINK_REQ_FAST)
288 req->timer_intv = TIPC_LINK_REQ_FAST;
289 if ((req->timer_intv == TIPC_LINK_REQ_FAST) &&
290 (req->bearer->nodes.count))
291 req->timer_intv = TIPC_LINK_REQ_SLOW;
293 k_start_timer(&req->timer, req->timer_intv);
295 spin_unlock_bh(&req->bearer->publ.lock);
299 * tipc_disc_init_link_req - start sending periodic link setup requests
300 * @b_ptr: ptr to bearer issuing requests
301 * @dest: destination address for request messages
302 * @dest_domain: network domain of node(s) which should respond to message
303 * @req_links: max number of desired links
305 * Returns pointer to link request structure, or NULL if unable to create.
308 struct link_req *tipc_disc_init_link_req(struct bearer *b_ptr,
309 const struct tipc_media_addr *dest,
313 struct link_req *req;
315 req = kmalloc(sizeof(*req), GFP_ATOMIC);
319 req->buf = tipc_disc_init_msg(DSC_REQ_MSG, req_links, dest_domain, b_ptr);
325 memcpy(&req->dest, dest, sizeof(*dest));
327 req->timer_intv = TIPC_LINK_REQ_INIT;
328 k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req);
329 k_start_timer(&req->timer, req->timer_intv);