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 |
2d627b92 | 5 | * Copyright (c) 2005-2006, 2010-2011, 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" | |
b97bf3fd | 38 | #include "link.h" |
b97bf3fd | 39 | #include "discover.h" |
b97bf3fd PL |
40 | |
41 | #define TIPC_LINK_REQ_INIT 125 /* min delay during bearer start up */ | |
42 | #define TIPC_LINK_REQ_FAST 2000 /* normal delay if bearer has no links */ | |
43 | #define TIPC_LINK_REQ_SLOW 600000 /* normal delay if bearer has links */ | |
44 | ||
c4307285 | 45 | /* |
b97bf3fd PL |
46 | * TODO: Most of the inter-cluster setup stuff should be |
47 | * rewritten, and be made conformant with specification. | |
c4307285 | 48 | */ |
b97bf3fd PL |
49 | |
50 | ||
51 | /** | |
52 | * struct link_req - information about an ongoing link setup request | |
53 | * @bearer: bearer issuing requests | |
54 | * @dest: destination address for request messages | |
55 | * @buf: request message to be (repeatedly) sent | |
56 | * @timer: timer governing period between requests | |
57 | * @timer_intv: current interval between requests (in ms) | |
58 | */ | |
59 | struct link_req { | |
2d627b92 | 60 | struct tipc_bearer *bearer; |
b97bf3fd PL |
61 | struct tipc_media_addr dest; |
62 | struct sk_buff *buf; | |
63 | struct timer_list timer; | |
64 | unsigned int timer_intv; | |
65 | }; | |
66 | ||
c4307285 | 67 | /** |
4323add6 | 68 | * tipc_disc_init_msg - initialize a link setup message |
b97bf3fd | 69 | * @type: message type (request or response) |
b97bf3fd PL |
70 | * @dest_domain: network domain of node(s) which should respond to message |
71 | * @b_ptr: ptr to bearer issuing message | |
72 | */ | |
73 | ||
988f088a | 74 | static struct sk_buff *tipc_disc_init_msg(u32 type, |
988f088a | 75 | u32 dest_domain, |
2d627b92 | 76 | struct tipc_bearer *b_ptr) |
b97bf3fd | 77 | { |
d901a42b | 78 | struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE); |
b97bf3fd PL |
79 | struct tipc_msg *msg; |
80 | ||
81 | if (buf) { | |
82 | msg = buf_msg(buf); | |
d901a42b | 83 | tipc_msg_init(msg, LINK_CONFIG, type, INT_H_SIZE, dest_domain); |
40aecb1b | 84 | msg_set_non_seq(msg, 1); |
b97bf3fd PL |
85 | msg_set_dest_domain(msg, dest_domain); |
86 | msg_set_bc_netid(msg, tipc_net_id); | |
2d627b92 | 87 | msg_set_media_addr(msg, &b_ptr->addr); |
b97bf3fd PL |
88 | } |
89 | return buf; | |
90 | } | |
91 | ||
e91ed0bc AS |
92 | /** |
93 | * disc_dupl_alert - issue node address duplication alert | |
94 | * @b_ptr: pointer to bearer detecting duplication | |
95 | * @node_addr: duplicated node address | |
96 | * @media_addr: media address advertised by duplicated node | |
97 | */ | |
98 | ||
2d627b92 | 99 | static void disc_dupl_alert(struct tipc_bearer *b_ptr, u32 node_addr, |
e91ed0bc AS |
100 | struct tipc_media_addr *media_addr) |
101 | { | |
102 | char node_addr_str[16]; | |
103 | char media_addr_str[64]; | |
104 | struct print_buf pb; | |
105 | ||
c68ca7b7 | 106 | tipc_addr_string_fill(node_addr_str, node_addr); |
e91ed0bc AS |
107 | tipc_printbuf_init(&pb, media_addr_str, sizeof(media_addr_str)); |
108 | tipc_media_addr_printf(&pb, media_addr); | |
109 | tipc_printbuf_validate(&pb); | |
110 | warn("Duplicate %s using %s seen on <%s>\n", | |
2d627b92 | 111 | node_addr_str, media_addr_str, b_ptr->name); |
e91ed0bc AS |
112 | } |
113 | ||
b97bf3fd | 114 | /** |
4323add6 | 115 | * tipc_disc_recv_msg - handle incoming link setup message (request or response) |
b97bf3fd | 116 | * @buf: buffer containing message |
1265a021 | 117 | * @b_ptr: bearer that message arrived on |
b97bf3fd PL |
118 | */ |
119 | ||
2d627b92 | 120 | void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr) |
b97bf3fd | 121 | { |
a728750e | 122 | struct tipc_node *n_ptr; |
b97bf3fd | 123 | struct link *link; |
a728750e AS |
124 | struct tipc_media_addr media_addr, *addr; |
125 | struct sk_buff *rbuf; | |
b97bf3fd PL |
126 | struct tipc_msg *msg = buf_msg(buf); |
127 | u32 dest = msg_dest_domain(msg); | |
128 | u32 orig = msg_prevnode(msg); | |
129 | u32 net_id = msg_bc_netid(msg); | |
130 | u32 type = msg_type(msg); | |
a728750e | 131 | int link_fully_up; |
b97bf3fd | 132 | |
0e65967e | 133 | msg_get_media_addr(msg, &media_addr); |
b97bf3fd PL |
134 | buf_discard(buf); |
135 | ||
a728750e | 136 | /* Validate discovery message from requesting node */ |
b97bf3fd PL |
137 | if (net_id != tipc_net_id) |
138 | return; | |
4323add6 | 139 | if (!tipc_addr_domain_valid(dest)) |
b97bf3fd | 140 | return; |
4323add6 | 141 | if (!tipc_addr_node_valid(orig)) |
b97bf3fd | 142 | return; |
e91ed0bc | 143 | if (orig == tipc_own_addr) { |
2d627b92 | 144 | if (memcmp(&media_addr, &b_ptr->addr, sizeof(media_addr))) |
e91ed0bc | 145 | disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr); |
b97bf3fd | 146 | return; |
e91ed0bc | 147 | } |
c68ca7b7 | 148 | if (!tipc_in_scope(dest, tipc_own_addr)) |
b97bf3fd | 149 | return; |
a728750e AS |
150 | if (!in_own_cluster(orig)) |
151 | return; | |
5a68d5ee | 152 | |
a728750e AS |
153 | /* Locate structure corresponding to requesting node */ |
154 | n_ptr = tipc_node_find(orig); | |
155 | if (!n_ptr) { | |
156 | n_ptr = tipc_node_create(orig); | |
157 | if (!n_ptr) | |
5a68d5ee | 158 | return; |
a728750e AS |
159 | } |
160 | tipc_node_lock(n_ptr); | |
161 | ||
162 | /* Don't talk to neighbor during cleanup after last session */ | |
163 | if (n_ptr->cleanup_required) { | |
164 | tipc_node_unlock(n_ptr); | |
165 | return; | |
166 | } | |
5a68d5ee | 167 | |
a728750e AS |
168 | link = n_ptr->links[b_ptr->identity]; |
169 | ||
170 | /* Create a link endpoint for this bearer, if necessary */ | |
171 | if (!link) { | |
37b9c08a | 172 | link = tipc_link_create(n_ptr, b_ptr, &media_addr); |
b97bf3fd | 173 | if (!link) { |
a728750e AS |
174 | tipc_node_unlock(n_ptr); |
175 | return; | |
b97bf3fd | 176 | } |
a728750e AS |
177 | } |
178 | ||
179 | /* | |
180 | * Ensure requesting node's media address is correct | |
181 | * | |
182 | * If media address doesn't match and the link is working, reject the | |
183 | * request (must be from a duplicate node). | |
184 | * | |
185 | * If media address doesn't match and the link is not working, accept | |
186 | * the new media address and reset the link to ensure it starts up | |
187 | * cleanly. | |
188 | */ | |
189 | addr = &link->media_addr; | |
190 | if (memcmp(addr, &media_addr, sizeof(*addr))) { | |
191 | if (tipc_link_is_up(link) || (!link->started)) { | |
192 | disc_dupl_alert(b_ptr, orig, &media_addr); | |
193 | tipc_node_unlock(n_ptr); | |
b97bf3fd | 194 | return; |
b97bf3fd | 195 | } |
a728750e AS |
196 | warn("Resetting link <%s>, peer interface address changed\n", |
197 | link->name); | |
198 | memcpy(addr, &media_addr, sizeof(*addr)); | |
199 | tipc_link_reset(link); | |
200 | } | |
201 | ||
202 | /* Accept discovery message & send response, if necessary */ | |
203 | link_fully_up = link_working_working(link); | |
fa2bae2d | 204 | |
f9107ebe | 205 | if ((type == DSC_REQ_MSG) && !link_fully_up && !b_ptr->blocked) { |
fa2bae2d AS |
206 | rbuf = tipc_disc_init_msg(DSC_RESP_MSG, orig, b_ptr); |
207 | if (rbuf) { | |
208 | b_ptr->media->send_msg(rbuf, b_ptr, &media_addr); | |
209 | buf_discard(rbuf); | |
210 | } | |
b97bf3fd | 211 | } |
fa2bae2d AS |
212 | |
213 | tipc_node_unlock(n_ptr); | |
b97bf3fd PL |
214 | } |
215 | ||
216 | /** | |
4323add6 | 217 | * tipc_disc_stop_link_req - stop sending periodic link setup requests |
b97bf3fd PL |
218 | * @req: ptr to link request structure |
219 | */ | |
220 | ||
c4307285 | 221 | void tipc_disc_stop_link_req(struct link_req *req) |
b97bf3fd PL |
222 | { |
223 | if (!req) | |
224 | return; | |
c4307285 | 225 | |
b97bf3fd PL |
226 | k_cancel_timer(&req->timer); |
227 | k_term_timer(&req->timer); | |
228 | buf_discard(req->buf); | |
229 | kfree(req); | |
c4307285 | 230 | } |
b97bf3fd PL |
231 | |
232 | /** | |
4323add6 | 233 | * tipc_disc_update_link_req - update frequency of periodic link setup requests |
b97bf3fd PL |
234 | * @req: ptr to link request structure |
235 | */ | |
236 | ||
c4307285 | 237 | void tipc_disc_update_link_req(struct link_req *req) |
b97bf3fd PL |
238 | { |
239 | if (!req) | |
240 | return; | |
241 | ||
242 | if (req->timer_intv == TIPC_LINK_REQ_SLOW) { | |
243 | if (!req->bearer->nodes.count) { | |
244 | req->timer_intv = TIPC_LINK_REQ_FAST; | |
245 | k_start_timer(&req->timer, req->timer_intv); | |
246 | } | |
247 | } else if (req->timer_intv == TIPC_LINK_REQ_FAST) { | |
248 | if (req->bearer->nodes.count) { | |
249 | req->timer_intv = TIPC_LINK_REQ_SLOW; | |
250 | k_start_timer(&req->timer, req->timer_intv); | |
251 | } | |
252 | } else { | |
253 | /* leave timer "as is" if haven't yet reached a "normal" rate */ | |
254 | } | |
c4307285 | 255 | } |
b97bf3fd PL |
256 | |
257 | /** | |
258 | * disc_timeout - send a periodic link setup request | |
259 | * @req: ptr to link request structure | |
c4307285 | 260 | * |
b97bf3fd PL |
261 | * Called whenever a link setup request timer associated with a bearer expires. |
262 | */ | |
263 | ||
c4307285 | 264 | static void disc_timeout(struct link_req *req) |
b97bf3fd | 265 | { |
2d627b92 | 266 | spin_lock_bh(&req->bearer->lock); |
b97bf3fd | 267 | |
2d627b92 | 268 | req->bearer->media->send_msg(req->buf, req->bearer, &req->dest); |
b97bf3fd PL |
269 | |
270 | if ((req->timer_intv == TIPC_LINK_REQ_SLOW) || | |
271 | (req->timer_intv == TIPC_LINK_REQ_FAST)) { | |
272 | /* leave timer interval "as is" if already at a "normal" rate */ | |
273 | } else { | |
274 | req->timer_intv *= 2; | |
3ba07e65 AS |
275 | if (req->timer_intv > TIPC_LINK_REQ_FAST) |
276 | req->timer_intv = TIPC_LINK_REQ_FAST; | |
c4307285 | 277 | if ((req->timer_intv == TIPC_LINK_REQ_FAST) && |
b97bf3fd PL |
278 | (req->bearer->nodes.count)) |
279 | req->timer_intv = TIPC_LINK_REQ_SLOW; | |
280 | } | |
281 | k_start_timer(&req->timer, req->timer_intv); | |
282 | ||
2d627b92 | 283 | spin_unlock_bh(&req->bearer->lock); |
b97bf3fd PL |
284 | } |
285 | ||
286 | /** | |
4323add6 | 287 | * tipc_disc_init_link_req - start sending periodic link setup requests |
b97bf3fd PL |
288 | * @b_ptr: ptr to bearer issuing requests |
289 | * @dest: destination address for request messages | |
290 | * @dest_domain: network domain of node(s) which should respond to message | |
c4307285 | 291 | * |
b97bf3fd PL |
292 | * Returns pointer to link request structure, or NULL if unable to create. |
293 | */ | |
294 | ||
2d627b92 | 295 | struct link_req *tipc_disc_init_link_req(struct tipc_bearer *b_ptr, |
4323add6 | 296 | const struct tipc_media_addr *dest, |
2e07dda1 | 297 | u32 dest_domain) |
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 | ||
2e07dda1 | 305 | req->buf = tipc_disc_init_msg(DSC_REQ_MSG, 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 |