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1 | /* | |
2 | * net/tipc/discover.c | |
3 | * | |
4 | * Copyright (c) 2003-2006, Ericsson AB | |
5 | * Copyright (c) 2005, 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 | 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 | msg_init(msg, LINK_CONFIG, type, TIPC_OK, DSC_H_SIZE, | |
124 | dest_domain); | |
125 | msg_set_non_seq(msg); | |
126 | msg_set_req_links(msg, req_links); | |
127 | msg_set_dest_domain(msg, dest_domain); | |
128 | msg_set_bc_netid(msg, tipc_net_id); | |
129 | msg_set_media_addr(msg, &b_ptr->publ.addr); | |
130 | } | |
131 | return buf; | |
132 | } | |
133 | ||
134 | /** | |
135 | * tipc_disc_recv_msg - handle incoming link setup message (request or response) | |
136 | * @buf: buffer containing message | |
137 | */ | |
138 | ||
139 | void tipc_disc_recv_msg(struct sk_buff *buf) | |
140 | { | |
141 | struct bearer *b_ptr = (struct bearer *)TIPC_SKB_CB(buf)->handle; | |
142 | struct link *link; | |
143 | struct tipc_media_addr media_addr; | |
144 | struct tipc_msg *msg = buf_msg(buf); | |
145 | u32 dest = msg_dest_domain(msg); | |
146 | u32 orig = msg_prevnode(msg); | |
147 | u32 net_id = msg_bc_netid(msg); | |
148 | u32 type = msg_type(msg); | |
149 | ||
150 | msg_get_media_addr(msg,&media_addr); | |
151 | msg_dbg(msg, "RECV:"); | |
152 | buf_discard(buf); | |
153 | ||
154 | if (net_id != tipc_net_id) | |
155 | return; | |
156 | if (!tipc_addr_domain_valid(dest)) | |
157 | return; | |
158 | if (!tipc_addr_node_valid(orig)) | |
159 | return; | |
160 | if (orig == tipc_own_addr) | |
161 | return; | |
162 | if (!in_scope(dest, tipc_own_addr)) | |
163 | return; | |
164 | if (is_slave(tipc_own_addr) && is_slave(orig)) | |
165 | return; | |
166 | if (is_slave(orig) && !in_own_cluster(orig)) | |
167 | return; | |
168 | if (in_own_cluster(orig)) { | |
169 | /* Always accept link here */ | |
170 | struct sk_buff *rbuf; | |
171 | struct tipc_media_addr *addr; | |
172 | struct node *n_ptr = tipc_node_find(orig); | |
173 | int link_up; | |
174 | dbg(" in own cluster\n"); | |
175 | if (n_ptr == NULL) { | |
176 | n_ptr = tipc_node_create(orig); | |
177 | } | |
178 | if (n_ptr == NULL) { | |
179 | warn("Memory squeeze; Failed to create node\n"); | |
180 | return; | |
181 | } | |
182 | spin_lock_bh(&n_ptr->lock); | |
183 | link = n_ptr->links[b_ptr->identity]; | |
184 | if (!link) { | |
185 | dbg("creating link\n"); | |
186 | link = tipc_link_create(b_ptr, orig, &media_addr); | |
187 | if (!link) { | |
188 | spin_unlock_bh(&n_ptr->lock); | |
189 | return; | |
190 | } | |
191 | } | |
192 | addr = &link->media_addr; | |
193 | if (memcmp(addr, &media_addr, sizeof(*addr))) { | |
194 | char addr_string[16]; | |
195 | ||
196 | warn("New bearer address for %s\n", | |
197 | addr_string_fill(addr_string, orig)); | |
198 | memcpy(addr, &media_addr, sizeof(*addr)); | |
199 | tipc_link_reset(link); | |
200 | } | |
201 | link_up = tipc_link_is_up(link); | |
202 | spin_unlock_bh(&n_ptr->lock); | |
203 | if ((type == DSC_RESP_MSG) || link_up) | |
204 | return; | |
205 | rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr); | |
206 | if (rbuf != NULL) { | |
207 | msg_dbg(buf_msg(rbuf),"SEND:"); | |
208 | b_ptr->media->send_msg(rbuf, &b_ptr->publ, &media_addr); | |
209 | buf_discard(rbuf); | |
210 | } | |
211 | } | |
212 | } | |
213 | ||
214 | /** | |
215 | * tipc_disc_stop_link_req - stop sending periodic link setup requests | |
216 | * @req: ptr to link request structure | |
217 | */ | |
218 | ||
219 | void tipc_disc_stop_link_req(struct link_req *req) | |
220 | { | |
221 | if (!req) | |
222 | return; | |
223 | ||
224 | k_cancel_timer(&req->timer); | |
225 | k_term_timer(&req->timer); | |
226 | buf_discard(req->buf); | |
227 | kfree(req); | |
228 | } | |
229 | ||
230 | /** | |
231 | * tipc_disc_update_link_req - update frequency of periodic link setup requests | |
232 | * @req: ptr to link request structure | |
233 | */ | |
234 | ||
235 | void tipc_disc_update_link_req(struct link_req *req) | |
236 | { | |
237 | if (!req) | |
238 | return; | |
239 | ||
240 | if (req->timer_intv == TIPC_LINK_REQ_SLOW) { | |
241 | if (!req->bearer->nodes.count) { | |
242 | req->timer_intv = TIPC_LINK_REQ_FAST; | |
243 | k_start_timer(&req->timer, req->timer_intv); | |
244 | } | |
245 | } else if (req->timer_intv == TIPC_LINK_REQ_FAST) { | |
246 | if (req->bearer->nodes.count) { | |
247 | req->timer_intv = TIPC_LINK_REQ_SLOW; | |
248 | k_start_timer(&req->timer, req->timer_intv); | |
249 | } | |
250 | } else { | |
251 | /* leave timer "as is" if haven't yet reached a "normal" rate */ | |
252 | } | |
253 | } | |
254 | ||
255 | /** | |
256 | * disc_timeout - send a periodic link setup request | |
257 | * @req: ptr to link request structure | |
258 | * | |
259 | * Called whenever a link setup request timer associated with a bearer expires. | |
260 | */ | |
261 | ||
262 | static void disc_timeout(struct link_req *req) | |
263 | { | |
264 | spin_lock_bh(&req->bearer->publ.lock); | |
265 | ||
266 | req->bearer->media->send_msg(req->buf, &req->bearer->publ, &req->dest); | |
267 | ||
268 | if ((req->timer_intv == TIPC_LINK_REQ_SLOW) || | |
269 | (req->timer_intv == TIPC_LINK_REQ_FAST)) { | |
270 | /* leave timer interval "as is" if already at a "normal" rate */ | |
271 | } else { | |
272 | req->timer_intv *= 2; | |
273 | if (req->timer_intv > TIPC_LINK_REQ_SLOW) | |
274 | req->timer_intv = TIPC_LINK_REQ_SLOW; | |
275 | if ((req->timer_intv == TIPC_LINK_REQ_FAST) && | |
276 | (req->bearer->nodes.count)) | |
277 | req->timer_intv = TIPC_LINK_REQ_SLOW; | |
278 | } | |
279 | k_start_timer(&req->timer, req->timer_intv); | |
280 | ||
281 | spin_unlock_bh(&req->bearer->publ.lock); | |
282 | } | |
283 | ||
284 | /** | |
285 | * tipc_disc_init_link_req - start sending periodic link setup requests | |
286 | * @b_ptr: ptr to bearer issuing requests | |
287 | * @dest: destination address for request messages | |
288 | * @dest_domain: network domain of node(s) which should respond to message | |
289 | * @req_links: max number of desired links | |
290 | * | |
291 | * Returns pointer to link request structure, or NULL if unable to create. | |
292 | */ | |
293 | ||
294 | struct link_req *tipc_disc_init_link_req(struct bearer *b_ptr, | |
295 | const struct tipc_media_addr *dest, | |
296 | u32 dest_domain, | |
297 | u32 req_links) | |
298 | { | |
299 | struct link_req *req; | |
300 | ||
301 | req = (struct link_req *)kmalloc(sizeof(*req), GFP_ATOMIC); | |
302 | if (!req) | |
303 | return NULL; | |
304 | ||
305 | req->buf = tipc_disc_init_msg(DSC_REQ_MSG, req_links, dest_domain, b_ptr); | |
306 | if (!req->buf) { | |
307 | kfree(req); | |
308 | return NULL; | |
309 | } | |
310 | ||
311 | memcpy(&req->dest, dest, sizeof(*dest)); | |
312 | req->bearer = b_ptr; | |
313 | req->timer_intv = TIPC_LINK_REQ_INIT; | |
314 | k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req); | |
315 | k_start_timer(&req->timer, req->timer_intv); | |
316 | return req; | |
317 | } | |
318 |