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b97bf3fd PL |
1 | /* |
2 | * net/tipc/discover.c | |
c4307285 | 3 | * |
b45db71b | 4 | * Copyright (c) 2003-2006, 2014-2015, 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" | |
d3a43b90 | 38 | #include "node.h" |
b97bf3fd | 39 | #include "discover.h" |
b97bf3fd | 40 | |
2f55c437 YX |
41 | /* min delay during bearer start up */ |
42 | #define TIPC_LINK_REQ_INIT msecs_to_jiffies(125) | |
43 | /* max delay if bearer has no links */ | |
44 | #define TIPC_LINK_REQ_FAST msecs_to_jiffies(1000) | |
45 | /* max delay if bearer has links */ | |
46 | #define TIPC_LINK_REQ_SLOW msecs_to_jiffies(60000) | |
47 | /* indicates no timer in use */ | |
48 | #define TIPC_LINK_REQ_INACTIVE 0xffffffff | |
b97bf3fd | 49 | |
b97bf3fd | 50 | /** |
a18c4bc3 | 51 | * struct tipc_link_req - information about an ongoing link setup request |
7a2f7d18 | 52 | * @bearer_id: identity of bearer issuing requests |
7f9f95d9 | 53 | * @net: network namespace instance |
b97bf3fd | 54 | * @dest: destination address for request messages |
7a2f7d18 | 55 | * @domain: network domain to which links can be established |
1209966c | 56 | * @num_nodes: number of nodes currently discovered (i.e. with an active link) |
f9a2c80b | 57 | * @lock: spinlock for controlling access to requests |
b97bf3fd PL |
58 | * @buf: request message to be (repeatedly) sent |
59 | * @timer: timer governing period between requests | |
60 | * @timer_intv: current interval between requests (in ms) | |
61 | */ | |
a18c4bc3 | 62 | struct tipc_link_req { |
7a2f7d18 | 63 | u32 bearer_id; |
b97bf3fd | 64 | struct tipc_media_addr dest; |
7f9f95d9 | 65 | struct net *net; |
7a2f7d18 | 66 | u32 domain; |
1209966c | 67 | int num_nodes; |
f9a2c80b | 68 | spinlock_t lock; |
b97bf3fd PL |
69 | struct sk_buff *buf; |
70 | struct timer_list timer; | |
2f55c437 | 71 | unsigned long timer_intv; |
b97bf3fd PL |
72 | }; |
73 | ||
c4307285 | 74 | /** |
4323add6 | 75 | * tipc_disc_init_msg - initialize a link setup message |
c93d3baa | 76 | * @net: the applicable net namespace |
b97bf3fd | 77 | * @type: message type (request or response) |
1a90632d | 78 | * @b: ptr to bearer issuing message |
b97bf3fd | 79 | */ |
c93d3baa | 80 | static void tipc_disc_init_msg(struct net *net, struct sk_buff *buf, u32 type, |
1a90632d | 81 | struct tipc_bearer *b) |
b97bf3fd | 82 | { |
c93d3baa | 83 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
b97bf3fd | 84 | struct tipc_msg *msg; |
1a90632d | 85 | u32 dest_domain = b->domain; |
b97bf3fd | 86 | |
a8b9b96e | 87 | msg = buf_msg(buf); |
c5898636 | 88 | tipc_msg_init(tn->own_addr, msg, LINK_CONFIG, type, |
948fa2d1 | 89 | MAX_H_SIZE, dest_domain); |
a8b9b96e | 90 | msg_set_non_seq(msg, 1); |
bafa29e3 | 91 | msg_set_node_sig(msg, tn->random); |
fd556f20 | 92 | msg_set_node_capabilities(msg, TIPC_NODE_CAPABILITIES); |
a8b9b96e | 93 | msg_set_dest_domain(msg, dest_domain); |
c93d3baa | 94 | msg_set_bc_netid(msg, tn->net_id); |
1a90632d | 95 | b->media->addr2msg(msg_media_addr(msg), &b->addr); |
b97bf3fd PL |
96 | } |
97 | ||
e91ed0bc AS |
98 | /** |
99 | * disc_dupl_alert - issue node address duplication alert | |
1a90632d | 100 | * @b: pointer to bearer detecting duplication |
e91ed0bc AS |
101 | * @node_addr: duplicated node address |
102 | * @media_addr: media address advertised by duplicated node | |
103 | */ | |
1a90632d | 104 | static void disc_dupl_alert(struct tipc_bearer *b, u32 node_addr, |
e91ed0bc AS |
105 | struct tipc_media_addr *media_addr) |
106 | { | |
107 | char node_addr_str[16]; | |
108 | char media_addr_str[64]; | |
e91ed0bc | 109 | |
c68ca7b7 | 110 | tipc_addr_string_fill(node_addr_str, node_addr); |
dc1aed37 EH |
111 | tipc_media_addr_printf(media_addr_str, sizeof(media_addr_str), |
112 | media_addr); | |
2cf8aa19 | 113 | pr_warn("Duplicate %s using %s seen on <%s>\n", node_addr_str, |
1a90632d | 114 | media_addr_str, b->name); |
e91ed0bc AS |
115 | } |
116 | ||
b97bf3fd | 117 | /** |
c82910e2 | 118 | * tipc_disc_rcv - handle incoming discovery message (request or response) |
c93d3baa | 119 | * @net: the applicable net namespace |
b97bf3fd | 120 | * @buf: buffer containing message |
c82910e2 | 121 | * @bearer: bearer that message arrived on |
b97bf3fd | 122 | */ |
cf148816 | 123 | void tipc_disc_rcv(struct net *net, struct sk_buff *skb, |
c93d3baa | 124 | struct tipc_bearer *bearer) |
b97bf3fd | 125 | { |
c93d3baa | 126 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
c82910e2 | 127 | struct tipc_media_addr maddr; |
cf148816 JPM |
128 | struct sk_buff *rskb; |
129 | struct tipc_msg *hdr = buf_msg(skb); | |
130 | u32 ddom = msg_dest_domain(hdr); | |
131 | u32 onode = msg_prevnode(hdr); | |
132 | u32 net_id = msg_bc_netid(hdr); | |
133 | u32 mtyp = msg_type(hdr); | |
134 | u32 signature = msg_node_sig(hdr); | |
135 | u16 caps = msg_node_capabilities(hdr); | |
c82910e2 | 136 | bool respond = false; |
cf148816 | 137 | bool dupl_addr = false; |
e9942923 | 138 | int err; |
b97bf3fd | 139 | |
e9942923 | 140 | err = bearer->media->msg2addr(bearer, &maddr, msg_media_addr(hdr)); |
cf148816 | 141 | kfree_skb(skb); |
e9942923 RA |
142 | if (err) |
143 | return; | |
b97bf3fd | 144 | |
97878a40 | 145 | /* Ensure message from node is valid and communication is permitted */ |
c93d3baa | 146 | if (net_id != tn->net_id) |
b97bf3fd | 147 | return; |
c82910e2 | 148 | if (maddr.broadcast) |
d6d4577a | 149 | return; |
c82910e2 | 150 | if (!tipc_addr_domain_valid(ddom)) |
b97bf3fd | 151 | return; |
c82910e2 | 152 | if (!tipc_addr_node_valid(onode)) |
b97bf3fd | 153 | return; |
c82910e2 | 154 | |
34747539 | 155 | if (in_own_node(net, onode)) { |
c82910e2 | 156 | if (memcmp(&maddr, &bearer->addr, sizeof(maddr))) |
34747539 | 157 | disc_dupl_alert(bearer, tn->own_addr, &maddr); |
b97bf3fd | 158 | return; |
e91ed0bc | 159 | } |
34747539 | 160 | if (!tipc_in_scope(ddom, tn->own_addr)) |
b97bf3fd | 161 | return; |
c82910e2 | 162 | if (!tipc_in_scope(bearer->domain, onode)) |
a728750e | 163 | return; |
5a68d5ee | 164 | |
cf148816 JPM |
165 | tipc_node_check_dest(net, onode, bearer, caps, signature, |
166 | &maddr, &respond, &dupl_addr); | |
167 | if (dupl_addr) | |
c82910e2 | 168 | disc_dupl_alert(bearer, onode, &maddr); |
a728750e | 169 | |
c82910e2 JPM |
170 | /* Send response, if necessary */ |
171 | if (respond && (mtyp == DSC_REQ_MSG)) { | |
57d5f64d | 172 | rskb = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC); |
60852d67 JPM |
173 | if (!rskb) |
174 | return; | |
175 | tipc_disc_init_msg(net, rskb, DSC_RESP_MSG, bearer); | |
176 | tipc_bearer_xmit_skb(net, bearer->identity, rskb, &maddr); | |
b97bf3fd PL |
177 | } |
178 | } | |
179 | ||
b97bf3fd | 180 | /** |
1209966c | 181 | * disc_update - update frequency of periodic link setup requests |
b97bf3fd | 182 | * @req: ptr to link request structure |
972a77fb AS |
183 | * |
184 | * Reinitiates discovery process if discovery object has no associated nodes | |
185 | * and is either not currently searching or is searching at a slow rate | |
b97bf3fd | 186 | */ |
a18c4bc3 | 187 | static void disc_update(struct tipc_link_req *req) |
b97bf3fd | 188 | { |
972a77fb AS |
189 | if (!req->num_nodes) { |
190 | if ((req->timer_intv == TIPC_LINK_REQ_INACTIVE) || | |
191 | (req->timer_intv > TIPC_LINK_REQ_FAST)) { | |
192 | req->timer_intv = TIPC_LINK_REQ_INIT; | |
2f55c437 | 193 | mod_timer(&req->timer, jiffies + req->timer_intv); |
b97bf3fd | 194 | } |
b97bf3fd | 195 | } |
c4307285 | 196 | } |
b97bf3fd | 197 | |
1209966c AS |
198 | /** |
199 | * tipc_disc_add_dest - increment set of discovered nodes | |
200 | * @req: ptr to link request structure | |
201 | */ | |
a18c4bc3 | 202 | void tipc_disc_add_dest(struct tipc_link_req *req) |
1209966c | 203 | { |
f9a2c80b | 204 | spin_lock_bh(&req->lock); |
1209966c | 205 | req->num_nodes++; |
f9a2c80b | 206 | spin_unlock_bh(&req->lock); |
1209966c AS |
207 | } |
208 | ||
209 | /** | |
210 | * tipc_disc_remove_dest - decrement set of discovered nodes | |
211 | * @req: ptr to link request structure | |
212 | */ | |
a18c4bc3 | 213 | void tipc_disc_remove_dest(struct tipc_link_req *req) |
1209966c | 214 | { |
f9a2c80b | 215 | spin_lock_bh(&req->lock); |
1209966c AS |
216 | req->num_nodes--; |
217 | disc_update(req); | |
f9a2c80b | 218 | spin_unlock_bh(&req->lock); |
1209966c AS |
219 | } |
220 | ||
b97bf3fd PL |
221 | /** |
222 | * disc_timeout - send a periodic link setup request | |
2f55c437 | 223 | * @data: ptr to link request structure |
c4307285 | 224 | * |
b97bf3fd PL |
225 | * Called whenever a link setup request timer associated with a bearer expires. |
226 | */ | |
31b102bb | 227 | static void disc_timeout(struct timer_list *t) |
b97bf3fd | 228 | { |
31b102bb | 229 | struct tipc_link_req *req = from_timer(req, t, timer); |
60852d67 | 230 | struct sk_buff *skb; |
972a77fb AS |
231 | int max_delay; |
232 | ||
f9a2c80b | 233 | spin_lock_bh(&req->lock); |
b97bf3fd | 234 | |
972a77fb | 235 | /* Stop searching if only desired node has been found */ |
7a2f7d18 | 236 | if (tipc_node(req->domain) && req->num_nodes) { |
972a77fb AS |
237 | req->timer_intv = TIPC_LINK_REQ_INACTIVE; |
238 | goto exit; | |
b97bf3fd | 239 | } |
b97bf3fd | 240 | |
972a77fb AS |
241 | /* |
242 | * Send discovery message, then update discovery timer | |
243 | * | |
244 | * Keep doubling time between requests until limit is reached; | |
245 | * hold at fast polling rate if don't have any associated nodes, | |
246 | * otherwise hold at slow polling rate | |
247 | */ | |
60852d67 JPM |
248 | skb = skb_clone(req->buf, GFP_ATOMIC); |
249 | if (skb) | |
250 | tipc_bearer_xmit_skb(req->net, req->bearer_id, skb, &req->dest); | |
972a77fb AS |
251 | req->timer_intv *= 2; |
252 | if (req->num_nodes) | |
253 | max_delay = TIPC_LINK_REQ_SLOW; | |
254 | else | |
255 | max_delay = TIPC_LINK_REQ_FAST; | |
256 | if (req->timer_intv > max_delay) | |
257 | req->timer_intv = max_delay; | |
258 | ||
2f55c437 | 259 | mod_timer(&req->timer, jiffies + req->timer_intv); |
972a77fb | 260 | exit: |
f9a2c80b | 261 | spin_unlock_bh(&req->lock); |
b97bf3fd PL |
262 | } |
263 | ||
264 | /** | |
3a777ff8 | 265 | * tipc_disc_create - create object to send periodic link setup requests |
c93d3baa | 266 | * @net: the applicable net namespace |
1a90632d | 267 | * @b: ptr to bearer issuing requests |
b97bf3fd | 268 | * @dest: destination address for request messages |
66e019a6 | 269 | * @dest_domain: network domain to which links can be established |
c4307285 | 270 | * |
3a777ff8 | 271 | * Returns 0 if successful, otherwise -errno. |
b97bf3fd | 272 | */ |
1a90632d | 273 | int tipc_disc_create(struct net *net, struct tipc_bearer *b, |
4e801fa1 | 274 | struct tipc_media_addr *dest, struct sk_buff **skb) |
b97bf3fd | 275 | { |
a18c4bc3 | 276 | struct tipc_link_req *req; |
b97bf3fd | 277 | |
9df3f3d2 | 278 | req = kmalloc(sizeof(*req), GFP_ATOMIC); |
b97bf3fd | 279 | if (!req) |
3a777ff8 | 280 | return -ENOMEM; |
57d5f64d | 281 | req->buf = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC); |
22e7987a YX |
282 | if (!req->buf) { |
283 | kfree(req); | |
a8b9b96e | 284 | return -ENOMEM; |
22e7987a | 285 | } |
b97bf3fd | 286 | |
1a90632d | 287 | tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b); |
b97bf3fd | 288 | memcpy(&req->dest, dest, sizeof(*dest)); |
7f9f95d9 | 289 | req->net = net; |
1a90632d JPM |
290 | req->bearer_id = b->identity; |
291 | req->domain = b->domain; | |
1209966c | 292 | req->num_nodes = 0; |
b97bf3fd | 293 | req->timer_intv = TIPC_LINK_REQ_INIT; |
f9a2c80b | 294 | spin_lock_init(&req->lock); |
31b102bb | 295 | timer_setup(&req->timer, disc_timeout, 0); |
2f55c437 | 296 | mod_timer(&req->timer, jiffies + req->timer_intv); |
1a90632d | 297 | b->link_req = req; |
4e801fa1 | 298 | *skb = skb_clone(req->buf, GFP_ATOMIC); |
3a777ff8 AS |
299 | return 0; |
300 | } | |
301 | ||
302 | /** | |
303 | * tipc_disc_delete - destroy object sending periodic link setup requests | |
304 | * @req: ptr to link request structure | |
305 | */ | |
a18c4bc3 | 306 | void tipc_disc_delete(struct tipc_link_req *req) |
3a777ff8 | 307 | { |
2f55c437 | 308 | del_timer_sync(&req->timer); |
5f6d9123 | 309 | kfree_skb(req->buf); |
3a777ff8 | 310 | kfree(req); |
c4307285 | 311 | } |
a8b9b96e YX |
312 | |
313 | /** | |
314 | * tipc_disc_reset - reset object to send periodic link setup requests | |
c93d3baa | 315 | * @net: the applicable net namespace |
1a90632d | 316 | * @b: ptr to bearer issuing requests |
a8b9b96e YX |
317 | * @dest_domain: network domain to which links can be established |
318 | */ | |
1a90632d | 319 | void tipc_disc_reset(struct net *net, struct tipc_bearer *b) |
a8b9b96e | 320 | { |
1a90632d | 321 | struct tipc_link_req *req = b->link_req; |
60852d67 | 322 | struct sk_buff *skb; |
a8b9b96e YX |
323 | |
324 | spin_lock_bh(&req->lock); | |
1a90632d | 325 | tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b); |
7f9f95d9 | 326 | req->net = net; |
1a90632d JPM |
327 | req->bearer_id = b->identity; |
328 | req->domain = b->domain; | |
a8b9b96e YX |
329 | req->num_nodes = 0; |
330 | req->timer_intv = TIPC_LINK_REQ_INIT; | |
2f55c437 | 331 | mod_timer(&req->timer, jiffies + req->timer_intv); |
60852d67 JPM |
332 | skb = skb_clone(req->buf, GFP_ATOMIC); |
333 | if (skb) | |
334 | tipc_bearer_xmit_skb(net, req->bearer_id, skb, &req->dest); | |
a8b9b96e YX |
335 | spin_unlock_bh(&req->lock); |
336 | } |