-
Notifications
You must be signed in to change notification settings - Fork 1
/
fakeswitch.c
579 lines (522 loc) · 23.1 KB
/
fakeswitch.c
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
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <net/ethernet.h>
#include <netinet/in.h>
#include "pof.h"
#include "cbench.h"
#include "fakeswitch.h"
static int debug_msg(struct fakeswitch * fs, char * msg, ...);
static int make_features_reply(int switch_id, int xid, char * buf, int buflen);
//static int make_stats_desc_reply(struct ofp_stats_request * req, char * buf, int buflen);
static int parse_set_config(struct pof_header * msg);
static int make_config_reply(int id, int xid, char * buf, int buflen);
//static int make_vendor_reply(int xid, char * buf, int buflen);
static int make_packet_in(int switch_id, int xid, int buffer_id, char * buf, int buflen, int mac_address);
static int packet_out_is_lldp(struct pof_packet_out * po);
static void fakeswitch_handle_write(struct fakeswitch *fs);
static void fakeswitch_learn_dstmac(struct fakeswitch *fs);
void fakeswitch_change_status_now (struct fakeswitch *fs, int new_status);
void fakeswitch_change_status (struct fakeswitch *fs, int new_status);
static struct pof_switch_config Switch_config = {
.header = { POF_VERSION,
POFT_GET_CONFIG_REPLY,
0,
0},
.flags = 0,
.miss_send_len = 0,
};
static inline uint64_t htonll(uint64_t n)
{
return htonl(1) == 1 ? n : ((uint64_t) htonl(n) << 32) | htonl(n >> 32);
}
static inline uint64_t ntohll(uint64_t n)
{
return htonl(1) == 1 ? n : ((uint64_t) ntohl(n) << 32) | ntohl(n >> 32);
}
void fakeswitch_init(struct fakeswitch *fs, int dpid, int sock, int bufsize, int debug, int delay, enum test_mode mode, int total_mac_addresses, int learn_dstmac, int max_send_count)
{
char buf[BUFLEN];
struct pof_header pofph;
fs->sock = sock;
fs->debug = debug;
fs->id = dpid;
fs->inbuf = msgbuf_new(bufsize);
fs->outbuf = msgbuf_new(bufsize);
fs->probe_state = 0;
fs->mode = mode;
fs->probe_size = make_packet_in(fs->id, 0, 0, buf, BUFLEN, fs->current_mac_address++);
fs->max_send_count = max_send_count;
fs->send_count = 0;
fs->recv_count = 0;
fs->totoal_recv_count = 0;
fs->total_send_count = 0;
fs->switch_status = START;
fs->delay = delay;
fs->total_mac_addresses = total_mac_addresses;
fs->current_mac_address = 0;
fs->xid = 1;
fs->learn_dstmac = learn_dstmac;
fs->current_buffer_id = 1;
pofph.version = POF_VERSION;
pofph.type = POFT_HELLO;
pofph.length = htons(sizeof(pofph));
pofph.xid = htonl(1);
// Send HELLO
msgbuf_push(fs->outbuf,(char * ) &pofph, sizeof(pofph));
debug_msg(fs, " sent hello");
}
/***********************************************************************/
void fakeswitch_learn_dstmac(struct fakeswitch *fs)
{
// thanks wireshark
char gratuitous_arp_reply [] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x0c,
0x29, 0x1a, 0x29, 0x1a, 0x08, 0x06, 0x00, 0x01,
0x08, 0x00, 0x06, 0x04, 0x00, 0x02, 0x00, 0x0c,
0x29, 0x1a, 0x29, 0x1a, 0x7f, 0x00, 0x00, 0x01,
0x00, 0x0c, 0x29, 0x1a, 0x29, 0x1a, 0x7f, 0x00,
0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
char mac_address_to_learn[] = { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 };
char ip_address_to_learn[] = { 192, 168 , 1, 40 };
char buf [512];
int len = 32 + sizeof(gratuitous_arp_reply);
struct pof_packet_in *pkt_in;
struct ether_header * eth;
void * arp_reply;
memset(buf, 0, sizeof(buf));
pkt_in = ( struct pof_packet_in *) buf;
pkt_in->header.version = POF_VERSION;
pkt_in->header.type = POFT_PACKET_IN;
pkt_in->header.length = htons(len);
pkt_in->header.xid = htonl(fs->xid++);
pkt_in->buffer_id = -1;
pkt_in->total_len = htons(sizeof(gratuitous_arp_reply));
pkt_in->port_id = htons(2);
pkt_in->reason = POFR_NO_MATCH;
memcpy(pkt_in->data, gratuitous_arp_reply, sizeof(gratuitous_arp_reply));
mac_address_to_learn[5] = fs->id;
ip_address_to_learn[2] = fs->id;
eth = (struct ether_header * ) pkt_in->data;
memcpy (eth->ether_shost, mac_address_to_learn, 6);
arp_reply = ((void *) eth) + sizeof (struct ether_header);
memcpy ( arp_reply + 8, mac_address_to_learn, 6);
memcpy ( arp_reply + 14, ip_address_to_learn, 4);
memcpy ( arp_reply + 18, mac_address_to_learn, 6);
memcpy ( arp_reply + 24, ip_address_to_learn, 4);
msgbuf_push(fs->outbuf,(char * ) pkt_in, len);
debug_msg(fs, " sent gratuitous ARP reply to learn about mac address: version %d length %d type %d eth: %x arp: %x ", pkt_in->header.version, len, buf[1], eth, arp_reply);
}
/***********************************************************************/
void fakeswitch_set_pollfd(struct fakeswitch *fs, struct pollfd *pfd)
{
pfd->events = POLLIN|POLLOUT;
/* if(msgbuf_count_buffered(fs->outbuf) > 0)
pfd->events |= POLLOUT; */
pfd->fd = fs->sock;
}
/***********************************************************************/
int fakeswitch_get_recv_count(struct fakeswitch *fs)
{
int ret = fs->recv_count;
fs->recv_count = 0;
fs->probe_state = 0; // reset packet state
/*int count;
int msglen;
struct pof_header * pofph;
// keep reading until there is nothing to clear out the queue
while( (count = msgbuf_read(fs->inbuf,fs->sock)) > 0) {
while(count > 0) {
// need to read msg by msg to ensure framing isn't broken
if (msgbuf_count_buffered(fs->inbuf) >= sizeof(struct pof_header)) {
pofph = msgbuf_peek(fs->inbuf);
msglen = ntohs(pofph->length);
if(count < msglen)
break; // msg not all there yet;
msgbuf_pull(fs->inbuf, NULL, ntohs(pofph->length));
count -= msglen;
} else {
break;
}
}
}*/
return ret;
}
int fakeswitch_get_send_count(struct fakeswitch *fs) {
int ret = fs->send_count;
fs->send_count = 0;
return ret;
}
/***********************************************************************/
static int parse_set_config(struct pof_header * msg) {
/*struct ofp_switch_config * sc;
assert(msg->type == OFPT_SET_CONFIG);
sc = (struct ofp_switch_config *) msg;
memcpy(&Switch_config, sc, sizeof(struct ofp_switch_config));*/
return 0;
}
/***********************************************************************/
static int make_config_reply(int id, int xid, char * buf, int buflen) {
int len = sizeof(struct pof_switch_config);
assert(buflen >= len);
Switch_config.header.type = POFT_GET_CONFIG_REPLY;
Switch_config.header.length = htons(len);
Switch_config.header.xid = xid;
Switch_config.dev_id = htonl(id);
memcpy(buf, &Switch_config, len);
return len;
}
/***********************************************************************/
static int make_features_reply(int id, int xid, char * buf, int buflen)
{
struct pof_switch_features * features;
const char fake[] = // stolen from wireshark, total 216 bytes
{
0x04, 0x06, 0x00, 0xd8, 0x00, 0x00, 0x15, 0xf1,
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, 0x00, 0x17, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f,
0x48, 0x75, 0x61, 0x77, 0x65, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x50, 0x4f, 0x46, 0x53, 0x77, 0x69, 0x74, 0x63, 0x68, 0x2d, 0x31, 0x2e, 0x34, 0x2e, 0x30, 0x2e,
0x30, 0x31, 0x35, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x50, 0x4f, 0x46, 0x53, 0x77, 0x69, 0x74, 0x63, 0x68, 0x2d, 0x31, 0x2e, 0x34, 0x2e, 0x30, 0x2e,
0x30, 0x31, 0x35, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
assert(buflen> sizeof(fake));
memcpy(buf, fake, sizeof(fake));
features = (struct pof_switch_features *) buf;
features->header.version = POF_VERSION;
features->header.xid = xid;
features->dev_id = htonl(id); //sizeof(dev_id) = 4
return sizeof(fake);
}
/***********************************************************************/
static int make_table_resource_reply(int xid, char * buf, int buflen)
{
struct pof_flow_table_resource * table_resource;
const char fake[] = // stolen from wireshark, total 88 bytes
{
0x04, 0x0d, 0x00, 0x58, 0x00, 0x00, 0x15, 0xf3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00,
0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x08, 0x01, 0x40,
0x00, 0x00, 0x17, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x02, 0x01, 0x40,
0x00, 0x00, 0x17, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x06, 0x01, 0x40,
0x00, 0x00, 0x17, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x07, 0x01, 0x40,
0x00, 0x00, 0x17, 0x70, 0x00, 0x00, 0x00, 0x00
};
assert(buflen> sizeof(fake));
memcpy(buf, fake, sizeof(fake));
table_resource = (struct pof_flow_table_resource *) buf;
table_resource->header.version = POF_VERSION;
table_resource->header.type = POFT_RESOURCE_REPORT;
table_resource->header.xid = xid;
return sizeof(fake);
}
/***********************************************************************/
static int make_port_status_reply(int xid, char * buf, int buflen)
{
struct pof_port_status * port_status;
const char fake[] = // stolen from wireshark, total 136 bytes
{
0x04, 0x0c, 0x00, 0x88, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0xa2, 0xe6, 0xec, 0x18, 0xd3, 0xdf, 0x00, 0x00,
0x73, 0x31, 0x2d, 0x65, 0x74, 0x68, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x0a,
0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
assert(buflen> sizeof(fake));
memcpy(buf, fake, sizeof(fake));
port_status = (struct pof_port_status *) buf;
port_status->header.version = POF_VERSION;
port_status->header.type = POFT_PORT_STATUS;
port_status->header.xid = xid;
return sizeof(fake);
}
/***********************************************************************
* return 1 if the embedded packet in the packet_out is lldp or bddp
*
*/
#ifndef ETHERTYPE_LLDP
#define ETHERTYPE_LLDP 0x88cc
#endif
#ifndef ETHERTYPE_BDDP
#define ETHERTYPE_BDDP 0x8942
#endif
static int packet_out_is_lldp(struct pof_packet_out * po){
//char * ptr = (char *) po;
//ptr += sizeof(struct ofp_packet_out) + ntohs(po->actions_len);
char * ptr = po->data;
struct ether_header * ethernet = (struct ether_header *) ptr;
unsigned short ethertype = ntohs(ethernet->ether_type);
if (ethertype == ETHERTYPE_VLAN) {
ethernet = (struct ether_header *) ((char *) ethernet) +4;
ethertype = ntohs(ethernet->ether_type);
}
return ethertype == ETHERTYPE_LLDP || ethertype == ETHERTYPE_BDDP;
}
/***********************************************************************/
static int make_packet_in(int switch_id, int xid, int buffer_id, char * buf, int buflen, int mac_address)
{
struct pof_packet_in * pi;
struct ether_header * eth;
const char fake[] = { // stolen from wireshark, total 130 bytes
0x04, 0x0a, 0x00, 0x82, 0x00, 0x00, 0x00, 0x0e,
0xff, 0xff, 0xff, 0xff, 0x00, 0x62, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01, 0x08, 0x00, 0x45, 0x00, 0x00, 0x54, 0xd5, 0xf1, 0x40, 0x00, 0x40, 0x01,
0x50, 0xb5, 0x0a, 0x00, 0x00, 0x01, 0x0a, 0x00, 0x00, 0x02, 0x08, 0x00, 0x76, 0xa3, 0x06, 0x7c,
0x00, 0x01, 0x0c, 0xd0, 0x49, 0x59, 0x00, 0x00, 0x00, 0x00, 0x5e, 0xe3, 0x07, 0x00, 0x00, 0x00,
0x00, 0x00, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d,
0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37
};
assert(buflen> sizeof(fake));
memcpy(buf, fake, sizeof(fake));
pi = (struct pof_packet_in *) buf;
pi->header.version = POF_VERSION;
pi->header.xid = htonl(xid);
pi->buffer_id = htonl(buffer_id);
eth = (struct ether_header * ) pi->data;
// copy into src mac addr; only 4 bytes, but should suffice to not confuse
// the controller; don't overwrite first byte
memcpy(ð->ether_shost[1], &mac_address, sizeof(mac_address));
// mark this as coming from us, mostly for debug
eth->ether_dhost[5] = switch_id;
eth->ether_shost[5] = switch_id;
return sizeof(fake);
}
void fakeswitch_change_status_now (struct fakeswitch *fs, int new_status) {
fs->switch_status = new_status;
if(new_status == READY_TO_SEND) {
fs->recv_count = 0;
fs->probe_state = 0;
}
}
void fakeswitch_change_status(struct fakeswitch *fs, int new_status) {
if( fs->delay == 0) {
fakeswitch_change_status_now(fs, new_status);
debug_msg(fs, " switched to next status %d", new_status);
} else {
fs->switch_status = WAITING;
fs->next_status = new_status;
gettimeofday(&fs->delay_start, NULL);
fs->delay_start.tv_sec += fs->delay / 1000;
fs->delay_start.tv_usec += (fs->delay % 1000 ) * 1000;
debug_msg(fs, " delaying next status %d by %d ms", new_status, fs->delay);
}
}
/***********************************************************************/
void fakeswitch_handle_read(struct fakeswitch *fs)
{
int count;
struct pof_header * pofh;
struct pof_header echo;
struct pof_role_reply role_reply;
//struct ofp_header barrier;
char buf[BUFLEN];
count = msgbuf_read(fs->inbuf, fs->sock); // read any queued data
if (count <= 0)
{
fprintf(stderr, "controller msgbuf_read() = %d: ", count);
if(count < 0)
perror("msgbuf_read");
else
fprintf(stderr, " closed connection ");
fprintf(stderr, "... exiting\n");
exit(1);
}
while((count= msgbuf_count_buffered(fs->inbuf)) >= sizeof(struct pof_header ))
{
pofh = msgbuf_peek(fs->inbuf);
if(count < ntohs(pofh->length))
return; // msg not all there yet
msgbuf_pull(fs->inbuf, NULL, ntohs(pofh->length));
pof_flow_entry * fm;
pof_packet_out * po;
pof_role_request * rr;
switch(pofh->type)
{
case POFT_PACKET_OUT:
po = (pof_packet_out *) pofh;
if ( fs->switch_status == READY_TO_SEND && ! packet_out_is_lldp(po)) {
// assume this is in response to what we sent
fs->recv_count++; // got response to what we went
fs->probe_state--;
}
break;
case POFT_FLOW_MOD:
fm = (pof_flow_entry *) pofh;
if(fs->switch_status == READY_TO_SEND && (fm->command == htons(POFFC_ADD) ||
fm->command == htons(POFFC_MODIFY_STRICT)))
{
fs->recv_count++; // got response to what we went
fs->probe_state--;
}
break;
case POFT_TABLE_MOD:
debug_msg(fs, "Got table_mode message");
break;
case POFT_FEATURES_REQUEST:
// pull msgs out of buffer
debug_msg(fs, "got feature_req");
// Send features reply
count = make_features_reply(fs->id, pofh->xid, buf, BUFLEN);
msgbuf_push(fs->outbuf, buf, count);
debug_msg(fs, "sent feature_rsp");
fakeswitch_change_status(fs, fs->learn_dstmac ? LEARN_DSTMAC : READY_TO_SEND);
break;
case POFT_SET_CONFIG:
// pull msgs out of buffer
debug_msg(fs, "parsing set_config");
parse_set_config(pofh);
break;
case POFT_GET_CONFIG_REQUEST:
// pull msgs out of buffer
debug_msg(fs, "got get_config_request");
count = make_config_reply(fs->id, pofh->xid, buf, BUFLEN);
msgbuf_push(fs->outbuf, buf, count);
debug_msg(fs, "sent get_config_reply");
count = make_table_resource_reply(pofh->xid, buf, BUFLEN);
msgbuf_push(fs->outbuf, buf, count);
debug_msg(fs, "send table resource report, length: %d", count);
//the fake switch has two port, thus we need to send two port status message.
count = make_port_status_reply(pofh->xid, buf, BUFLEN);
msgbuf_push(fs->outbuf, buf, count);
debug_msg(fs, "sent port status, length: %d", count);
msgbuf_push(fs->outbuf, buf, count);
debug_msg(fs, "sent port status, length: %d", count);
if ((fs->mode == MODE_LATENCY) && ( fs->probe_state == 1 )) {
fs->probe_state = 0; // restart probe state b/c some
// controllers block on config
debug_msg(fs, "reset probe state b/c of get_config_reply");
}
break;
case POFT_HELLO:
debug_msg(fs, "got hello");
// we already sent our own HELLO; don't respond
break;
case POFT_ECHO_REQUEST:
debug_msg(fs, "got echo, sent echo_resp");
echo.version= POF_VERSION;
echo.length = htons(sizeof(echo));
echo.type = POFT_ECHO_REPLY;
echo.xid = pofh->xid;
msgbuf_push(fs->outbuf,(char *) &echo, sizeof(echo));
break;
case POFT_ROLE_REQUEST:
debug_msg(fs, "got role_request, sent role_reply");
rr = (pof_role_request *) pofh;
role_reply.header.version = POF_VERSION;
// pay attention: sizeof(role_reply) = 12, but the real length of role_reply is 9 bytes.
role_reply.header.length = htons(9);
role_reply.header.type = POFT_ROLE_REPLY;
role_reply.header.xid = pofh->xid;
role_reply.role = rr->role;
msgbuf_push(fs->outbuf,(char *) &role_reply, 9);
break;
default:
// if(fs->debug)
fprintf(stderr, "Ignoring POF message type %d\n", pofh->type);
};
if(fs->probe_state < 0)
{
debug_msg(fs, "WARN: Got more responses than probes!!: : %d",
fs->probe_state);
fs->probe_state =0;
}
}
}
/***********************************************************************/
static void fakeswitch_handle_write(struct fakeswitch *fs)
{
char buf[BUFLEN];
int count ;
int send_count = 0 ;
int throughput_buffer = BUFLEN;
int i;
int buffer_capacity;
if( fs->switch_status == READY_TO_SEND)
{
if ((fs->mode == MODE_LATENCY) && ( fs->probe_state == 0 ))
send_count = 1; // just send one packet
else if ((fs->mode == MODE_THROUGHPUT) &&
(msgbuf_count_buffered(fs->outbuf) < throughput_buffer) &&
(fs->max_send_count > fs->send_count))
{
// keep buffer full
buffer_capacity = (throughput_buffer - msgbuf_count_buffered(fs->outbuf)) / fs->probe_size;
send_count = fs->max_send_count - fs->send_count;
if (buffer_capacity < send_count)
send_count = buffer_capacity;
}
for (i = 0; i < send_count; i++)
{
// queue up packet
fs->probe_state++;
// TODO come back and remove this copy
count = make_packet_in(fs->id, fs->xid++, fs->current_buffer_id, buf, BUFLEN, fs->current_mac_address);
fs->current_mac_address = ( fs->current_mac_address + 1 ) % fs->total_mac_addresses;
fs->current_buffer_id = ( fs->current_buffer_id + 1 ) % NUM_BUFFER_IDS;
msgbuf_push(fs->outbuf, buf, count);
debug_msg(fs, "send message %d", i);
}
fs->send_count = fs->send_count + send_count;
} else if( fs->switch_status == WAITING)
{
struct timeval now;
gettimeofday(&now, NULL);
if (timercmp(&now, &fs->delay_start, > ))
{
fakeswitch_change_status_now(fs, fs->next_status);
fs->delay = 0;
debug_msg(fs, " delay is over: switching to state %d", fs->next_status);
}
} else if ( fs->switch_status == LEARN_DSTMAC)
{
// we should learn the dst mac addresses
fakeswitch_learn_dstmac(fs);
fakeswitch_change_status(fs, READY_TO_SEND);
}
// send any data if it's queued
if( msgbuf_count_buffered(fs->outbuf) > 0)
msgbuf_write(fs->outbuf, fs->sock, 0);
}
/***********************************************************************/
void fakeswitch_handle_io(struct fakeswitch *fs, const struct pollfd *pfd)
{
if(pfd->revents & POLLIN)
fakeswitch_handle_read(fs);
if(pfd->revents & POLLOUT)
fakeswitch_handle_write(fs);
}
/************************************************************************/
static int debug_msg(struct fakeswitch * fs, char * msg, ...)
{
va_list aq;
if(fs->debug == 0 )
return 0;
fprintf(stderr,"\n-------Switch %d: ", fs->id);
va_start(aq,msg);
vfprintf(stderr,msg,aq);
if(msg[strlen(msg)-1] != '\n')
fprintf(stderr, "\n");
// fflush(stderr); // should be redundant, but often isn't :-(
return 1;
}