Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/discover.c | |
c4307285 | 3 | * |
9da1c8b6 | 4 | * Copyright (c) 2003-2006, Ericsson AB |
3ba07e65 | 5 | * Copyright (c) 2005-2006, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
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 | |
b97bf3fd PL |
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 | ||
c4307285 | 49 | /* |
b97bf3fd PL |
50 | * TODO: Most of the inter-cluster setup stuff should be |
51 | * rewritten, and be made conformant with specification. | |
c4307285 | 52 | */ |
b97bf3fd PL |
53 | |
54 | ||
55 | /** | |
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) | |
62 | */ | |
63 | struct link_req { | |
64 | struct bearer *bearer; | |
65 | struct tipc_media_addr dest; | |
66 | struct sk_buff *buf; | |
67 | struct timer_list timer; | |
68 | unsigned int timer_intv; | |
69 | }; | |
70 | ||
c4307285 | 71 | /** |
4323add6 | 72 | * tipc_disc_init_msg - initialize a link setup message |
b97bf3fd PL |
73 | * @type: message type (request or response) |
74 | * @req_links: number of links associated with message | |
75 | * @dest_domain: network domain of node(s) which should respond to message | |
76 | * @b_ptr: ptr to bearer issuing message | |
77 | */ | |
78 | ||
988f088a AB |
79 | static struct sk_buff *tipc_disc_init_msg(u32 type, |
80 | u32 req_links, | |
81 | u32 dest_domain, | |
82 | struct bearer *b_ptr) | |
b97bf3fd | 83 | { |
31e3c3f6 | 84 | struct sk_buff *buf = tipc_buf_acquire(DSC_H_SIZE); |
b97bf3fd PL |
85 | struct tipc_msg *msg; |
86 | ||
87 | if (buf) { | |
88 | msg = buf_msg(buf); | |
c68ca7b7 | 89 | tipc_msg_init(msg, LINK_CONFIG, type, DSC_H_SIZE, dest_domain); |
40aecb1b | 90 | msg_set_non_seq(msg, 1); |
b97bf3fd PL |
91 | msg_set_req_links(msg, req_links); |
92 | msg_set_dest_domain(msg, dest_domain); | |
93 | msg_set_bc_netid(msg, tipc_net_id); | |
94 | msg_set_media_addr(msg, &b_ptr->publ.addr); | |
95 | } | |
96 | return buf; | |
97 | } | |
98 | ||
e91ed0bc AS |
99 | /** |
100 | * disc_dupl_alert - issue node address duplication alert | |
101 | * @b_ptr: pointer to bearer detecting duplication | |
102 | * @node_addr: duplicated node address | |
103 | * @media_addr: media address advertised by duplicated node | |
104 | */ | |
105 | ||
106 | static void disc_dupl_alert(struct bearer *b_ptr, u32 node_addr, | |
107 | struct tipc_media_addr *media_addr) | |
108 | { | |
109 | char node_addr_str[16]; | |
110 | char media_addr_str[64]; | |
111 | struct print_buf pb; | |
112 | ||
c68ca7b7 | 113 | tipc_addr_string_fill(node_addr_str, node_addr); |
e91ed0bc AS |
114 | tipc_printbuf_init(&pb, media_addr_str, sizeof(media_addr_str)); |
115 | tipc_media_addr_printf(&pb, media_addr); | |
116 | tipc_printbuf_validate(&pb); | |
117 | warn("Duplicate %s using %s seen on <%s>\n", | |
118 | node_addr_str, media_addr_str, b_ptr->publ.name); | |
119 | } | |
120 | ||
b97bf3fd | 121 | /** |
4323add6 | 122 | * tipc_disc_recv_msg - handle incoming link setup message (request or response) |
b97bf3fd | 123 | * @buf: buffer containing message |
1265a021 | 124 | * @b_ptr: bearer that message arrived on |
b97bf3fd PL |
125 | */ |
126 | ||
1265a021 | 127 | void tipc_disc_recv_msg(struct sk_buff *buf, struct bearer *b_ptr) |
b97bf3fd | 128 | { |
b97bf3fd PL |
129 | struct link *link; |
130 | struct tipc_media_addr media_addr; | |
131 | struct tipc_msg *msg = buf_msg(buf); | |
132 | u32 dest = msg_dest_domain(msg); | |
133 | u32 orig = msg_prevnode(msg); | |
134 | u32 net_id = msg_bc_netid(msg); | |
135 | u32 type = msg_type(msg); | |
136 | ||
137 | msg_get_media_addr(msg,&media_addr); | |
138 | msg_dbg(msg, "RECV:"); | |
139 | buf_discard(buf); | |
140 | ||
141 | if (net_id != tipc_net_id) | |
142 | return; | |
4323add6 | 143 | if (!tipc_addr_domain_valid(dest)) |
b97bf3fd | 144 | return; |
4323add6 | 145 | if (!tipc_addr_node_valid(orig)) |
b97bf3fd | 146 | return; |
e91ed0bc AS |
147 | if (orig == tipc_own_addr) { |
148 | if (memcmp(&media_addr, &b_ptr->publ.addr, sizeof(media_addr))) | |
149 | disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr); | |
b97bf3fd | 150 | return; |
e91ed0bc | 151 | } |
c68ca7b7 | 152 | if (!tipc_in_scope(dest, tipc_own_addr)) |
b97bf3fd PL |
153 | return; |
154 | if (is_slave(tipc_own_addr) && is_slave(orig)) | |
155 | return; | |
156 | if (is_slave(orig) && !in_own_cluster(orig)) | |
157 | return; | |
158 | if (in_own_cluster(orig)) { | |
159 | /* Always accept link here */ | |
160 | struct sk_buff *rbuf; | |
161 | struct tipc_media_addr *addr; | |
6c00055a | 162 | struct tipc_node *n_ptr = tipc_node_find(orig); |
2de07f61 AS |
163 | int link_fully_up; |
164 | ||
b97bf3fd PL |
165 | dbg(" in own cluster\n"); |
166 | if (n_ptr == NULL) { | |
4323add6 | 167 | n_ptr = tipc_node_create(orig); |
811102ca AS |
168 | if (!n_ptr) |
169 | return; | |
b97bf3fd PL |
170 | } |
171 | spin_lock_bh(&n_ptr->lock); | |
5a68d5ee AS |
172 | |
173 | /* Don't talk to neighbor during cleanup after last session */ | |
174 | ||
175 | if (n_ptr->cleanup_required) { | |
176 | spin_unlock_bh(&n_ptr->lock); | |
177 | return; | |
178 | } | |
179 | ||
b97bf3fd PL |
180 | link = n_ptr->links[b_ptr->identity]; |
181 | if (!link) { | |
182 | dbg("creating link\n"); | |
4323add6 | 183 | link = tipc_link_create(b_ptr, orig, &media_addr); |
b97bf3fd | 184 | if (!link) { |
c4307285 | 185 | spin_unlock_bh(&n_ptr->lock); |
b97bf3fd PL |
186 | return; |
187 | } | |
188 | } | |
189 | addr = &link->media_addr; | |
190 | if (memcmp(addr, &media_addr, sizeof(*addr))) { | |
e91ed0bc AS |
191 | if (tipc_link_is_up(link) || (!link->started)) { |
192 | disc_dupl_alert(b_ptr, orig, &media_addr); | |
193 | spin_unlock_bh(&n_ptr->lock); | |
194 | return; | |
195 | } | |
a10bd924 AS |
196 | warn("Resetting link <%s>, peer interface address changed\n", |
197 | link->name); | |
b97bf3fd | 198 | memcpy(addr, &media_addr, sizeof(*addr)); |
c4307285 | 199 | tipc_link_reset(link); |
b97bf3fd | 200 | } |
01fee256 | 201 | link_fully_up = link_working_working(link); |
c4307285 | 202 | spin_unlock_bh(&n_ptr->lock); |
2de07f61 | 203 | if ((type == DSC_RESP_MSG) || link_fully_up) |
b97bf3fd | 204 | return; |
4323add6 | 205 | rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr); |
b97bf3fd PL |
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 | /** | |
4323add6 | 215 | * tipc_disc_stop_link_req - stop sending periodic link setup requests |
b97bf3fd PL |
216 | * @req: ptr to link request structure |
217 | */ | |
218 | ||
c4307285 | 219 | void tipc_disc_stop_link_req(struct link_req *req) |
b97bf3fd PL |
220 | { |
221 | if (!req) | |
222 | return; | |
c4307285 | 223 | |
b97bf3fd PL |
224 | k_cancel_timer(&req->timer); |
225 | k_term_timer(&req->timer); | |
226 | buf_discard(req->buf); | |
227 | kfree(req); | |
c4307285 | 228 | } |
b97bf3fd PL |
229 | |
230 | /** | |
4323add6 | 231 | * tipc_disc_update_link_req - update frequency of periodic link setup requests |
b97bf3fd PL |
232 | * @req: ptr to link request structure |
233 | */ | |
234 | ||
c4307285 | 235 | void tipc_disc_update_link_req(struct link_req *req) |
b97bf3fd PL |
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 | } | |
c4307285 | 253 | } |
b97bf3fd PL |
254 | |
255 | /** | |
256 | * disc_timeout - send a periodic link setup request | |
257 | * @req: ptr to link request structure | |
c4307285 | 258 | * |
b97bf3fd PL |
259 | * Called whenever a link setup request timer associated with a bearer expires. |
260 | */ | |
261 | ||
c4307285 | 262 | static void disc_timeout(struct link_req *req) |
b97bf3fd | 263 | { |
b97bf3fd PL |
264 | spin_lock_bh(&req->bearer->publ.lock); |
265 | ||
b97bf3fd PL |
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; | |
3ba07e65 AS |
273 | if (req->timer_intv > TIPC_LINK_REQ_FAST) |
274 | req->timer_intv = TIPC_LINK_REQ_FAST; | |
c4307285 | 275 | if ((req->timer_intv == TIPC_LINK_REQ_FAST) && |
b97bf3fd PL |
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 | /** | |
4323add6 | 285 | * tipc_disc_init_link_req - start sending periodic link setup requests |
b97bf3fd PL |
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 | |
c4307285 | 290 | * |
b97bf3fd PL |
291 | * Returns pointer to link request structure, or NULL if unable to create. |
292 | */ | |
293 | ||
c4307285 | 294 | struct link_req *tipc_disc_init_link_req(struct bearer *b_ptr, |
4323add6 PL |
295 | const struct tipc_media_addr *dest, |
296 | u32 dest_domain, | |
c4307285 | 297 | u32 req_links) |
b97bf3fd PL |
298 | { |
299 | struct link_req *req; | |
300 | ||
9df3f3d2 | 301 | req = kmalloc(sizeof(*req), GFP_ATOMIC); |
b97bf3fd PL |
302 | if (!req) |
303 | return NULL; | |
304 | ||
4323add6 | 305 | req->buf = tipc_disc_init_msg(DSC_REQ_MSG, req_links, dest_domain, b_ptr); |
b97bf3fd PL |
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; | |
c4307285 | 317 | } |
b97bf3fd | 318 |