1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37#include "core.h"
38#include "link.h"
39#include "discover.h"
40
41#define TIPC_LINK_REQ_INIT 125
42#define TIPC_LINK_REQ_FAST 2000
43#define TIPC_LINK_REQ_SLOW 600000
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59struct link_req {
60 struct tipc_bearer *bearer;
61 struct tipc_media_addr dest;
62 struct sk_buff *buf;
63 struct timer_list timer;
64 unsigned int timer_intv;
65};
66
67
68
69
70
71
72
73
74static struct sk_buff *tipc_disc_init_msg(u32 type,
75 u32 dest_domain,
76 struct tipc_bearer *b_ptr)
77{
78 struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE);
79 struct tipc_msg *msg;
80
81 if (buf) {
82 msg = buf_msg(buf);
83 tipc_msg_init(msg, LINK_CONFIG, type, INT_H_SIZE, dest_domain);
84 msg_set_non_seq(msg, 1);
85 msg_set_dest_domain(msg, dest_domain);
86 msg_set_bc_netid(msg, tipc_net_id);
87 msg_set_media_addr(msg, &b_ptr->addr);
88 }
89 return buf;
90}
91
92
93
94
95
96
97
98
99static void disc_dupl_alert(struct tipc_bearer *b_ptr, u32 node_addr,
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
106 tipc_addr_string_fill(node_addr_str, node_addr);
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",
111 node_addr_str, media_addr_str, b_ptr->name);
112}
113
114
115
116
117
118
119
120void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr)
121{
122 struct tipc_node *n_ptr;
123 struct link *link;
124 struct tipc_media_addr media_addr, *addr;
125 struct sk_buff *rbuf;
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);
131 int link_fully_up;
132
133 msg_get_media_addr(msg, &media_addr);
134 buf_discard(buf);
135
136
137 if (net_id != tipc_net_id)
138 return;
139 if (!tipc_addr_domain_valid(dest))
140 return;
141 if (!tipc_addr_node_valid(orig))
142 return;
143 if (orig == tipc_own_addr) {
144 if (memcmp(&media_addr, &b_ptr->addr, sizeof(media_addr)))
145 disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr);
146 return;
147 }
148 if (!tipc_in_scope(dest, tipc_own_addr))
149 return;
150 if (!in_own_cluster(orig))
151 return;
152
153
154 n_ptr = tipc_node_find(orig);
155 if (!n_ptr) {
156 n_ptr = tipc_node_create(orig);
157 if (!n_ptr)
158 return;
159 }
160 tipc_node_lock(n_ptr);
161
162
163 if (n_ptr->cleanup_required) {
164 tipc_node_unlock(n_ptr);
165 return;
166 }
167
168 link = n_ptr->links[b_ptr->identity];
169
170
171 if (!link) {
172 link = tipc_link_create(n_ptr, b_ptr, &media_addr);
173 if (!link) {
174 tipc_node_unlock(n_ptr);
175 return;
176 }
177 }
178
179
180
181
182
183
184
185
186
187
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);
194 return;
195 }
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
203 link_fully_up = link_working_working(link);
204
205 if ((type == DSC_REQ_MSG) && !link_fully_up && !b_ptr->blocked) {
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 }
211 }
212
213 tipc_node_unlock(n_ptr);
214}
215
216
217
218
219
220
221void tipc_disc_stop_link_req(struct link_req *req)
222{
223 if (!req)
224 return;
225
226 k_cancel_timer(&req->timer);
227 k_term_timer(&req->timer);
228 buf_discard(req->buf);
229 kfree(req);
230}
231
232
233
234
235
236
237void tipc_disc_update_link_req(struct link_req *req)
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
254 }
255}
256
257
258
259
260
261
262
263
264static void disc_timeout(struct link_req *req)
265{
266 spin_lock_bh(&req->bearer->lock);
267
268 req->bearer->media->send_msg(req->buf, req->bearer, &req->dest);
269
270 if ((req->timer_intv == TIPC_LINK_REQ_SLOW) ||
271 (req->timer_intv == TIPC_LINK_REQ_FAST)) {
272
273 } else {
274 req->timer_intv *= 2;
275 if (req->timer_intv > TIPC_LINK_REQ_FAST)
276 req->timer_intv = TIPC_LINK_REQ_FAST;
277 if ((req->timer_intv == TIPC_LINK_REQ_FAST) &&
278 (req->bearer->nodes.count))
279 req->timer_intv = TIPC_LINK_REQ_SLOW;
280 }
281 k_start_timer(&req->timer, req->timer_intv);
282
283 spin_unlock_bh(&req->bearer->lock);
284}
285
286
287
288
289
290
291
292
293
294
295struct link_req *tipc_disc_init_link_req(struct tipc_bearer *b_ptr,
296 const struct tipc_media_addr *dest,
297 u32 dest_domain)
298{
299 struct link_req *req;
300
301 req = kmalloc(sizeof(*req), GFP_ATOMIC);
302 if (!req)
303 return NULL;
304
305 req->buf = tipc_disc_init_msg(DSC_REQ_MSG, 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
319