/usr/src/openvswitch-1.4.0/ofproto/connmgr.c is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 | /*
* Copyright (c) 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "connmgr.h"
#include <errno.h>
#include <stdlib.h>
#include "coverage.h"
#include "fail-open.h"
#include "in-band.h"
#include "odp-util.h"
#include "ofp-util.h"
#include "ofpbuf.h"
#include "ofproto-provider.h"
#include "pinsched.h"
#include "poll-loop.h"
#include "pktbuf.h"
#include "rconn.h"
#include "shash.h"
#include "timeval.h"
#include "vconn.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(connmgr);
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
/* An OpenFlow connection. */
struct ofconn {
struct connmgr *connmgr; /* Connection's manager. */
struct list node; /* In struct connmgr's "all_conns" list. */
struct rconn *rconn; /* OpenFlow connection. */
enum ofconn_type type; /* Type. */
enum nx_flow_format flow_format; /* Currently selected flow format. */
bool flow_mod_table_id; /* NXT_FLOW_MOD_TABLE_ID enabled? */
/* Asynchronous flow table operation support. */
struct list opgroups; /* Contains pending "ofopgroups", if any. */
struct ofpbuf *blocked; /* Postponed OpenFlow message, if any. */
bool retry; /* True if 'blocked' is ready to try again. */
/* OFPT_PACKET_IN related data. */
struct rconn_packet_counter *packet_in_counter; /* # queued on 'rconn'. */
#define N_SCHEDULERS 2
struct pinsched *schedulers[N_SCHEDULERS];
struct pktbuf *pktbuf; /* OpenFlow packet buffers. */
int miss_send_len; /* Bytes to send of buffered packets. */
/* Number of OpenFlow messages queued on 'rconn' as replies to OpenFlow
* requests, and the maximum number before we stop reading OpenFlow
* requests. */
#define OFCONN_REPLY_MAX 100
struct rconn_packet_counter *reply_counter;
/* type == OFCONN_PRIMARY only. */
enum nx_role role; /* Role. */
struct hmap_node hmap_node; /* In struct connmgr's "controllers" map. */
enum ofproto_band band; /* In-band or out-of-band? */
};
static struct ofconn *ofconn_create(struct connmgr *, struct rconn *,
enum ofconn_type);
static void ofconn_destroy(struct ofconn *);
static void ofconn_reconfigure(struct ofconn *,
const struct ofproto_controller *);
static void ofconn_run(struct ofconn *,
bool (*handle_openflow)(struct ofconn *,
struct ofpbuf *ofp_msg));
static void ofconn_wait(struct ofconn *, bool handling_openflow);
static const char *ofconn_get_target(const struct ofconn *);
static char *ofconn_make_name(const struct connmgr *, const char *target);
static void ofconn_set_rate_limit(struct ofconn *, int rate, int burst);
static bool ofconn_receives_async_msgs(const struct ofconn *);
static void ofconn_send(const struct ofconn *, struct ofpbuf *,
struct rconn_packet_counter *);
static void do_send_packet_in(struct ofpbuf *, void *ofconn_);
/* A listener for incoming OpenFlow "service" connections. */
struct ofservice {
struct hmap_node node; /* In struct connmgr's "services" hmap. */
struct pvconn *pvconn; /* OpenFlow connection listener. */
/* These are not used by ofservice directly. They are settings for
* accepted "struct ofconn"s from the pvconn. */
int probe_interval; /* Max idle time before probing, in seconds. */
int rate_limit; /* Max packet-in rate in packets per second. */
int burst_limit; /* Limit on accumulating packet credits. */
};
static void ofservice_reconfigure(struct ofservice *,
const struct ofproto_controller *);
static int ofservice_create(struct connmgr *, const char *target);
static void ofservice_destroy(struct connmgr *, struct ofservice *);
static struct ofservice *ofservice_lookup(struct connmgr *,
const char *target);
/* Connection manager for an OpenFlow switch. */
struct connmgr {
struct ofproto *ofproto;
char *name;
char *local_port_name;
/* OpenFlow connections. */
struct hmap controllers; /* Controller "struct ofconn"s. */
struct list all_conns; /* Contains "struct ofconn"s. */
/* OpenFlow listeners. */
struct hmap services; /* Contains "struct ofservice"s. */
struct pvconn **snoops;
size_t n_snoops;
/* Fail open. */
struct fail_open *fail_open;
enum ofproto_fail_mode fail_mode;
/* In-band control. */
struct in_band *in_band;
struct sockaddr_in *extra_in_band_remotes;
size_t n_extra_remotes;
int in_band_queue;
};
static void update_in_band_remotes(struct connmgr *);
static void add_snooper(struct connmgr *, struct vconn *);
/* Creates and returns a new connection manager owned by 'ofproto'. 'name' is
* a name for the ofproto suitable for using in log messages.
* 'local_port_name' is the name of the local port (OFPP_LOCAL) within
* 'ofproto'. */
struct connmgr *
connmgr_create(struct ofproto *ofproto,
const char *name, const char *local_port_name)
{
struct connmgr *mgr;
mgr = xmalloc(sizeof *mgr);
mgr->ofproto = ofproto;
mgr->name = xstrdup(name);
mgr->local_port_name = xstrdup(local_port_name);
hmap_init(&mgr->controllers);
list_init(&mgr->all_conns);
hmap_init(&mgr->services);
mgr->snoops = NULL;
mgr->n_snoops = 0;
mgr->fail_open = NULL;
mgr->fail_mode = OFPROTO_FAIL_SECURE;
mgr->in_band = NULL;
mgr->extra_in_band_remotes = NULL;
mgr->n_extra_remotes = 0;
mgr->in_band_queue = -1;
return mgr;
}
/* Frees 'mgr' and all of its resources. */
void
connmgr_destroy(struct connmgr *mgr)
{
struct ofservice *ofservice, *next_ofservice;
struct ofconn *ofconn, *next_ofconn;
size_t i;
if (!mgr) {
return;
}
LIST_FOR_EACH_SAFE (ofconn, next_ofconn, node, &mgr->all_conns) {
ofconn_destroy(ofconn);
}
hmap_destroy(&mgr->controllers);
HMAP_FOR_EACH_SAFE (ofservice, next_ofservice, node, &mgr->services) {
ofservice_destroy(mgr, ofservice);
}
hmap_destroy(&mgr->services);
for (i = 0; i < mgr->n_snoops; i++) {
pvconn_close(mgr->snoops[i]);
}
free(mgr->snoops);
fail_open_destroy(mgr->fail_open);
mgr->fail_open = NULL;
in_band_destroy(mgr->in_band);
mgr->in_band = NULL;
free(mgr->extra_in_band_remotes);
free(mgr->name);
free(mgr->local_port_name);
free(mgr);
}
/* Does all of the periodic maintenance required by 'mgr'.
*
* If 'handle_openflow' is nonnull, calls 'handle_openflow' for each message
* received on an OpenFlow connection, passing along the OpenFlow connection
* itself and the message that was sent. If 'handle_openflow' returns true,
* the message is considered to be fully processed. If 'handle_openflow'
* returns false, the message is considered not to have been processed at all;
* it will be stored and re-presented to 'handle_openflow' following the next
* call to connmgr_retry(). 'handle_openflow' must not modify or free the
* message.
*
* If 'handle_openflow' is NULL, no OpenFlow messages will be processed and
* other activities that could affect the flow table (in-band processing,
* fail-open processing) are suppressed too. */
void
connmgr_run(struct connmgr *mgr,
bool (*handle_openflow)(struct ofconn *, struct ofpbuf *ofp_msg))
{
struct ofconn *ofconn, *next_ofconn;
struct ofservice *ofservice;
size_t i;
if (handle_openflow && mgr->in_band) {
if (!in_band_run(mgr->in_band)) {
in_band_destroy(mgr->in_band);
mgr->in_band = NULL;
}
}
LIST_FOR_EACH_SAFE (ofconn, next_ofconn, node, &mgr->all_conns) {
ofconn_run(ofconn, handle_openflow);
}
/* Fail-open maintenance. Do this after processing the ofconns since
* fail-open checks the status of the controller rconn. */
if (handle_openflow && mgr->fail_open) {
fail_open_run(mgr->fail_open);
}
HMAP_FOR_EACH (ofservice, node, &mgr->services) {
struct vconn *vconn;
int retval;
retval = pvconn_accept(ofservice->pvconn, OFP_VERSION, &vconn);
if (!retval) {
struct rconn *rconn;
char *name;
rconn = rconn_create(ofservice->probe_interval, 0);
name = ofconn_make_name(mgr, vconn_get_name(vconn));
rconn_connect_unreliably(rconn, vconn, name);
free(name);
ofconn = ofconn_create(mgr, rconn, OFCONN_SERVICE);
ofconn_set_rate_limit(ofconn, ofservice->rate_limit,
ofservice->burst_limit);
} else if (retval != EAGAIN) {
VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval));
}
}
for (i = 0; i < mgr->n_snoops; i++) {
struct vconn *vconn;
int retval;
retval = pvconn_accept(mgr->snoops[i], OFP_VERSION, &vconn);
if (!retval) {
add_snooper(mgr, vconn);
} else if (retval != EAGAIN) {
VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval));
}
}
}
/* Causes the poll loop to wake up when connmgr_run() needs to run.
*
* If 'handling_openflow' is true, arriving OpenFlow messages and other
* activities that affect the flow table will wake up the poll loop. If
* 'handling_openflow' is false, they will not. */
void
connmgr_wait(struct connmgr *mgr, bool handling_openflow)
{
struct ofservice *ofservice;
struct ofconn *ofconn;
size_t i;
LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
ofconn_wait(ofconn, handling_openflow);
}
if (handling_openflow && mgr->in_band) {
in_band_wait(mgr->in_band);
}
if (handling_openflow && mgr->fail_open) {
fail_open_wait(mgr->fail_open);
}
HMAP_FOR_EACH (ofservice, node, &mgr->services) {
pvconn_wait(ofservice->pvconn);
}
for (i = 0; i < mgr->n_snoops; i++) {
pvconn_wait(mgr->snoops[i]);
}
}
/* Returns the ofproto that owns 'ofconn''s connmgr. */
struct ofproto *
ofconn_get_ofproto(const struct ofconn *ofconn)
{
return ofconn->connmgr->ofproto;
}
/* If processing of OpenFlow messages was blocked on any 'mgr' ofconns by
* returning false to the 'handle_openflow' callback to connmgr_run(), this
* re-enables them. */
void
connmgr_retry(struct connmgr *mgr)
{
struct ofconn *ofconn;
LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
ofconn->retry = true;
}
}
/* OpenFlow configuration. */
static void add_controller(struct connmgr *, const char *target);
static struct ofconn *find_controller_by_target(struct connmgr *,
const char *target);
static void update_fail_open(struct connmgr *);
static int set_pvconns(struct pvconn ***pvconnsp, size_t *n_pvconnsp,
const struct sset *);
/* Returns true if 'mgr' has any configured primary controllers.
*
* Service controllers do not count, but configured primary controllers do
* count whether or not they are currently connected. */
bool
connmgr_has_controllers(const struct connmgr *mgr)
{
return !hmap_is_empty(&mgr->controllers);
}
/* Initializes 'info' and populates it with information about each configured
* primary controller. The keys in 'info' are the controllers' targets; the
* data values are corresponding "struct ofproto_controller_info".
*
* The caller owns 'info' and everything in it and should free it when it is no
* longer needed. */
void
connmgr_get_controller_info(struct connmgr *mgr, struct shash *info)
{
const struct ofconn *ofconn;
HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
const struct rconn *rconn = ofconn->rconn;
const char *target = rconn_get_target(rconn);
if (!shash_find(info, target)) {
struct ofproto_controller_info *cinfo = xmalloc(sizeof *cinfo);
time_t now = time_now();
time_t last_connection = rconn_get_last_connection(rconn);
time_t last_disconnect = rconn_get_last_disconnect(rconn);
int last_error = rconn_get_last_error(rconn);
shash_add(info, target, cinfo);
cinfo->is_connected = rconn_is_connected(rconn);
cinfo->role = ofconn->role;
cinfo->pairs.n = 0;
if (last_error) {
cinfo->pairs.keys[cinfo->pairs.n] = "last_error";
cinfo->pairs.values[cinfo->pairs.n++]
= xstrdup(ovs_retval_to_string(last_error));
}
cinfo->pairs.keys[cinfo->pairs.n] = "state";
cinfo->pairs.values[cinfo->pairs.n++]
= xstrdup(rconn_get_state(rconn));
if (last_connection != TIME_MIN) {
cinfo->pairs.keys[cinfo->pairs.n] = "sec_since_connect";
cinfo->pairs.values[cinfo->pairs.n++]
= xasprintf("%ld", (long int) (now - last_connection));
}
if (last_disconnect != TIME_MIN) {
cinfo->pairs.keys[cinfo->pairs.n] = "sec_since_disconnect";
cinfo->pairs.values[cinfo->pairs.n++]
= xasprintf("%ld", (long int) (now - last_disconnect));
}
}
}
}
void
connmgr_free_controller_info(struct shash *info)
{
struct shash_node *node;
SHASH_FOR_EACH (node, info) {
struct ofproto_controller_info *cinfo = node->data;
while (cinfo->pairs.n) {
free((char *) cinfo->pairs.values[--cinfo->pairs.n]);
}
free(cinfo);
}
shash_destroy(info);
}
/* Changes 'mgr''s set of controllers to the 'n_controllers' controllers in
* 'controllers'. */
void
connmgr_set_controllers(struct connmgr *mgr,
const struct ofproto_controller *controllers,
size_t n_controllers)
{
bool had_controllers = connmgr_has_controllers(mgr);
struct shash new_controllers;
struct ofconn *ofconn, *next_ofconn;
struct ofservice *ofservice, *next_ofservice;
size_t i;
/* Create newly configured controllers and services.
* Create a name to ofproto_controller mapping in 'new_controllers'. */
shash_init(&new_controllers);
for (i = 0; i < n_controllers; i++) {
const struct ofproto_controller *c = &controllers[i];
if (!vconn_verify_name(c->target)) {
if (!find_controller_by_target(mgr, c->target)) {
add_controller(mgr, c->target);
}
} else if (!pvconn_verify_name(c->target)) {
if (!ofservice_lookup(mgr, c->target)) {
ofservice_create(mgr, c->target);
}
} else {
VLOG_WARN_RL(&rl, "%s: unsupported controller \"%s\"",
mgr->name, c->target);
continue;
}
shash_add_once(&new_controllers, c->target, &controllers[i]);
}
/* Delete controllers that are no longer configured.
* Update configuration of all now-existing controllers. */
HMAP_FOR_EACH_SAFE (ofconn, next_ofconn, hmap_node, &mgr->controllers) {
struct ofproto_controller *c;
c = shash_find_data(&new_controllers, ofconn_get_target(ofconn));
if (!c) {
ofconn_destroy(ofconn);
} else {
ofconn_reconfigure(ofconn, c);
}
}
/* Delete services that are no longer configured.
* Update configuration of all now-existing services. */
HMAP_FOR_EACH_SAFE (ofservice, next_ofservice, node, &mgr->services) {
struct ofproto_controller *c;
c = shash_find_data(&new_controllers,
pvconn_get_name(ofservice->pvconn));
if (!c) {
ofservice_destroy(mgr, ofservice);
} else {
ofservice_reconfigure(ofservice, c);
}
}
shash_destroy(&new_controllers);
update_in_band_remotes(mgr);
update_fail_open(mgr);
if (had_controllers != connmgr_has_controllers(mgr)) {
ofproto_flush_flows(mgr->ofproto);
}
}
/* Drops the connections between 'mgr' and all of its primary and secondary
* controllers, forcing them to reconnect. */
void
connmgr_reconnect(const struct connmgr *mgr)
{
struct ofconn *ofconn;
LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
rconn_reconnect(ofconn->rconn);
}
}
/* Sets the "snoops" for 'mgr' to the pvconn targets listed in 'snoops'.
*
* A "snoop" is a pvconn to which every OpenFlow message to or from the most
* important controller on 'mgr' is mirrored. */
int
connmgr_set_snoops(struct connmgr *mgr, const struct sset *snoops)
{
return set_pvconns(&mgr->snoops, &mgr->n_snoops, snoops);
}
/* Adds each of the snoops currently configured on 'mgr' to 'snoops'. */
void
connmgr_get_snoops(const struct connmgr *mgr, struct sset *snoops)
{
size_t i;
for (i = 0; i < mgr->n_snoops; i++) {
sset_add(snoops, pvconn_get_name(mgr->snoops[i]));
}
}
/* Returns true if 'mgr' has at least one snoop, false if it has none. */
bool
connmgr_has_snoops(const struct connmgr *mgr)
{
return mgr->n_snoops > 0;
}
/* Creates a new controller for 'target' in 'mgr'. update_controller() needs
* to be called later to finish the new ofconn's configuration. */
static void
add_controller(struct connmgr *mgr, const char *target)
{
char *name = ofconn_make_name(mgr, target);
struct ofconn *ofconn;
ofconn = ofconn_create(mgr, rconn_create(5, 8), OFCONN_PRIMARY);
ofconn->pktbuf = pktbuf_create();
ofconn->miss_send_len = OFP_DEFAULT_MISS_SEND_LEN;
rconn_connect(ofconn->rconn, target, name);
hmap_insert(&mgr->controllers, &ofconn->hmap_node, hash_string(target, 0));
free(name);
}
static struct ofconn *
find_controller_by_target(struct connmgr *mgr, const char *target)
{
struct ofconn *ofconn;
HMAP_FOR_EACH_WITH_HASH (ofconn, hmap_node,
hash_string(target, 0), &mgr->controllers) {
if (!strcmp(ofconn_get_target(ofconn), target)) {
return ofconn;
}
}
return NULL;
}
static void
update_in_band_remotes(struct connmgr *mgr)
{
struct sockaddr_in *addrs;
size_t max_addrs, n_addrs;
struct ofconn *ofconn;
size_t i;
/* Allocate enough memory for as many remotes as we could possibly have. */
max_addrs = mgr->n_extra_remotes + hmap_count(&mgr->controllers);
addrs = xmalloc(max_addrs * sizeof *addrs);
n_addrs = 0;
/* Add all the remotes. */
HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
struct sockaddr_in *sin = &addrs[n_addrs];
if (ofconn->band == OFPROTO_OUT_OF_BAND) {
continue;
}
sin->sin_addr.s_addr = rconn_get_remote_ip(ofconn->rconn);
if (sin->sin_addr.s_addr) {
sin->sin_port = rconn_get_remote_port(ofconn->rconn);
n_addrs++;
}
}
for (i = 0; i < mgr->n_extra_remotes; i++) {
addrs[n_addrs++] = mgr->extra_in_band_remotes[i];
}
/* Create or update or destroy in-band. */
if (n_addrs) {
if (!mgr->in_band) {
in_band_create(mgr->ofproto, mgr->local_port_name, &mgr->in_band);
}
in_band_set_queue(mgr->in_band, mgr->in_band_queue);
} else {
/* in_band_run() needs a chance to delete any existing in-band flows.
* We will destroy mgr->in_band after it's done with that. */
}
if (mgr->in_band) {
in_band_set_remotes(mgr->in_band, addrs, n_addrs);
}
/* Clean up. */
free(addrs);
}
static void
update_fail_open(struct connmgr *mgr)
{
if (connmgr_has_controllers(mgr)
&& mgr->fail_mode == OFPROTO_FAIL_STANDALONE) {
if (!mgr->fail_open) {
mgr->fail_open = fail_open_create(mgr->ofproto, mgr);
}
} else {
fail_open_destroy(mgr->fail_open);
mgr->fail_open = NULL;
}
}
static int
set_pvconns(struct pvconn ***pvconnsp, size_t *n_pvconnsp,
const struct sset *sset)
{
struct pvconn **pvconns = *pvconnsp;
size_t n_pvconns = *n_pvconnsp;
const char *name;
int retval = 0;
size_t i;
for (i = 0; i < n_pvconns; i++) {
pvconn_close(pvconns[i]);
}
free(pvconns);
pvconns = xmalloc(sset_count(sset) * sizeof *pvconns);
n_pvconns = 0;
SSET_FOR_EACH (name, sset) {
struct pvconn *pvconn;
int error;
error = pvconn_open(name, &pvconn);
if (!error) {
pvconns[n_pvconns++] = pvconn;
} else {
VLOG_ERR("failed to listen on %s: %s", name, strerror(error));
if (!retval) {
retval = error;
}
}
}
*pvconnsp = pvconns;
*n_pvconnsp = n_pvconns;
return retval;
}
/* Returns a "preference level" for snooping 'ofconn'. A higher return value
* means that 'ofconn' is more interesting for monitoring than a lower return
* value. */
static int
snoop_preference(const struct ofconn *ofconn)
{
switch (ofconn->role) {
case NX_ROLE_MASTER:
return 3;
case NX_ROLE_OTHER:
return 2;
case NX_ROLE_SLAVE:
return 1;
default:
/* Shouldn't happen. */
return 0;
}
}
/* One of 'mgr''s "snoop" pvconns has accepted a new connection on 'vconn'.
* Connects this vconn to a controller. */
static void
add_snooper(struct connmgr *mgr, struct vconn *vconn)
{
struct ofconn *ofconn, *best;
/* Pick a controller for monitoring. */
best = NULL;
LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
if (ofconn->type == OFCONN_PRIMARY
&& (!best || snoop_preference(ofconn) > snoop_preference(best))) {
best = ofconn;
}
}
if (best) {
rconn_add_monitor(best->rconn, vconn);
} else {
VLOG_INFO_RL(&rl, "no controller connection to snoop");
vconn_close(vconn);
}
}
/* Public ofconn functions. */
/* Returns the connection type, either OFCONN_PRIMARY or OFCONN_SERVICE. */
enum ofconn_type
ofconn_get_type(const struct ofconn *ofconn)
{
return ofconn->type;
}
/* Returns the role configured for 'ofconn'.
*
* The default role, if no other role has been set, is NX_ROLE_OTHER. */
enum nx_role
ofconn_get_role(const struct ofconn *ofconn)
{
return ofconn->role;
}
/* Changes 'ofconn''s role to 'role'. If 'role' is NX_ROLE_MASTER then any
* existing master is demoted to a slave. */
void
ofconn_set_role(struct ofconn *ofconn, enum nx_role role)
{
if (role == NX_ROLE_MASTER) {
struct ofconn *other;
HMAP_FOR_EACH (other, hmap_node, &ofconn->connmgr->controllers) {
if (other->role == NX_ROLE_MASTER) {
other->role = NX_ROLE_SLAVE;
}
}
}
ofconn->role = role;
}
/* Returns the currently configured flow format for 'ofconn', one of NXFF_*.
*
* The default, if no other format has been set, is NXFF_OPENFLOW10. */
enum nx_flow_format
ofconn_get_flow_format(struct ofconn *ofconn)
{
return ofconn->flow_format;
}
/* Sets the flow format for 'ofconn' to 'flow_format' (one of NXFF_*). */
void
ofconn_set_flow_format(struct ofconn *ofconn, enum nx_flow_format flow_format)
{
ofconn->flow_format = flow_format;
}
/* Returns true if the NXT_FLOW_MOD_TABLE_ID extension is enabled, false
* otherwise.
*
* By default the extension is not enabled. */
bool
ofconn_get_flow_mod_table_id(const struct ofconn *ofconn)
{
return ofconn->flow_mod_table_id;
}
/* Enables or disables (according to 'enable') the NXT_FLOW_MOD_TABLE_ID
* extension on 'ofconn'. */
void
ofconn_set_flow_mod_table_id(struct ofconn *ofconn, bool enable)
{
ofconn->flow_mod_table_id = enable;
}
/* Returns the default miss send length for 'ofconn'. */
int
ofconn_get_miss_send_len(const struct ofconn *ofconn)
{
return ofconn->miss_send_len;
}
/* Sets the default miss send length for 'ofconn' to 'miss_send_len'. */
void
ofconn_set_miss_send_len(struct ofconn *ofconn, int miss_send_len)
{
ofconn->miss_send_len = miss_send_len;
}
/* Sends 'msg' on 'ofconn', accounting it as a reply. (If there is a
* sufficient number of OpenFlow replies in-flight on a single ofconn, then the
* connmgr will stop accepting new OpenFlow requests on that ofconn until the
* controller has accepted some of the replies.) */
void
ofconn_send_reply(const struct ofconn *ofconn, struct ofpbuf *msg)
{
ofconn_send(ofconn, msg, ofconn->reply_counter);
}
/* Sends each of the messages in list 'replies' on 'ofconn' in order,
* accounting them as replies. */
void
ofconn_send_replies(const struct ofconn *ofconn, struct list *replies)
{
struct ofpbuf *reply, *next;
LIST_FOR_EACH_SAFE (reply, next, list_node, replies) {
list_remove(&reply->list_node);
ofconn_send_reply(ofconn, reply);
}
}
/* Sends 'error', which should be an OpenFlow error created with
* e.g. ofp_mkerr(), on 'ofconn', as a reply to 'request'. Only at most the
* first 64 bytes of 'request' are used. */
void
ofconn_send_error(const struct ofconn *ofconn,
const struct ofp_header *request, int error)
{
struct ofpbuf *msg;
msg = ofputil_encode_error_msg(error, request);
if (msg) {
static struct vlog_rate_limit err_rl = VLOG_RATE_LIMIT_INIT(10, 10);
if (!VLOG_DROP_INFO(&err_rl)) {
const struct ofputil_msg_type *type;
const char *type_name;
size_t request_len;
char *error_s;
request_len = ntohs(request->length);
type_name = (!ofputil_decode_msg_type_partial(request,
MIN(64, request_len),
&type)
? ofputil_msg_type_name(type)
: "invalid");
error_s = ofputil_error_to_string(error);
VLOG_INFO("%s: sending %s error reply to %s message",
rconn_get_name(ofconn->rconn), error_s, type_name);
free(error_s);
}
ofconn_send_reply(ofconn, msg);
}
}
/* Same as pktbuf_retrieve(), using the pktbuf owned by 'ofconn'. */
int
ofconn_pktbuf_retrieve(struct ofconn *ofconn, uint32_t id,
struct ofpbuf **bufferp, uint16_t *in_port)
{
return pktbuf_retrieve(ofconn->pktbuf, id, bufferp, in_port);
}
/* Returns true if 'ofconn' has any pending opgroups. */
bool
ofconn_has_pending_opgroups(const struct ofconn *ofconn)
{
return !list_is_empty(&ofconn->opgroups);
}
/* Adds 'ofconn_node' to 'ofconn''s list of pending opgroups.
*
* If 'ofconn' is destroyed or its connection drops, then 'ofconn' will remove
* 'ofconn_node' from the list and re-initialize it with list_init(). The
* client may, therefore, use list_is_empty(ofconn_node) to determine whether
* 'ofconn_node' is still associated with an active ofconn.
*
* The client may also remove ofconn_node from the list itself, with
* list_remove(). */
void
ofconn_add_opgroup(struct ofconn *ofconn, struct list *ofconn_node)
{
list_push_back(&ofconn->opgroups, ofconn_node);
}
/* Private ofconn functions. */
static const char *
ofconn_get_target(const struct ofconn *ofconn)
{
return rconn_get_target(ofconn->rconn);
}
static struct ofconn *
ofconn_create(struct connmgr *mgr, struct rconn *rconn, enum ofconn_type type)
{
struct ofconn *ofconn = xzalloc(sizeof *ofconn);
ofconn->connmgr = mgr;
list_push_back(&mgr->all_conns, &ofconn->node);
ofconn->rconn = rconn;
ofconn->type = type;
ofconn->flow_format = NXFF_OPENFLOW10;
ofconn->flow_mod_table_id = false;
list_init(&ofconn->opgroups);
ofconn->role = NX_ROLE_OTHER;
ofconn->packet_in_counter = rconn_packet_counter_create ();
ofconn->pktbuf = NULL;
ofconn->miss_send_len = 0;
ofconn->reply_counter = rconn_packet_counter_create ();
return ofconn;
}
/* Disassociates 'ofconn' from all of the ofopgroups that it initiated that
* have not yet completed. (Those ofopgroups will still run to completion in
* the usual way, but any errors that they run into will not be reported on any
* OpenFlow channel.)
*
* Also discards any blocked operation on 'ofconn'. */
static void
ofconn_flush(struct ofconn *ofconn)
{
while (!list_is_empty(&ofconn->opgroups)) {
list_init(list_pop_front(&ofconn->opgroups));
}
ofpbuf_delete(ofconn->blocked);
ofconn->blocked = NULL;
}
static void
ofconn_destroy(struct ofconn *ofconn)
{
ofconn_flush(ofconn);
if (ofconn->type == OFCONN_PRIMARY) {
hmap_remove(&ofconn->connmgr->controllers, &ofconn->hmap_node);
}
list_remove(&ofconn->node);
rconn_destroy(ofconn->rconn);
rconn_packet_counter_destroy(ofconn->packet_in_counter);
rconn_packet_counter_destroy(ofconn->reply_counter);
pktbuf_destroy(ofconn->pktbuf);
free(ofconn);
}
/* Reconfigures 'ofconn' to match 'c'. 'ofconn' and 'c' must have the same
* target. */
static void
ofconn_reconfigure(struct ofconn *ofconn, const struct ofproto_controller *c)
{
int probe_interval;
ofconn->band = c->band;
rconn_set_max_backoff(ofconn->rconn, c->max_backoff);
probe_interval = c->probe_interval ? MAX(c->probe_interval, 5) : 0;
rconn_set_probe_interval(ofconn->rconn, probe_interval);
ofconn_set_rate_limit(ofconn, c->rate_limit, c->burst_limit);
}
/* Returns true if it makes sense for 'ofconn' to receive and process OpenFlow
* messages. */
static bool
ofconn_may_recv(const struct ofconn *ofconn)
{
int count = rconn_packet_counter_read (ofconn->reply_counter);
return (!ofconn->blocked || ofconn->retry) && count < OFCONN_REPLY_MAX;
}
static void
ofconn_run(struct ofconn *ofconn,
bool (*handle_openflow)(struct ofconn *, struct ofpbuf *ofp_msg))
{
struct connmgr *mgr = ofconn->connmgr;
size_t i;
for (i = 0; i < N_SCHEDULERS; i++) {
pinsched_run(ofconn->schedulers[i], do_send_packet_in, ofconn);
}
rconn_run(ofconn->rconn);
if (handle_openflow) {
/* Limit the number of iterations to avoid starving other tasks. */
for (i = 0; i < 50 && ofconn_may_recv(ofconn); i++) {
struct ofpbuf *of_msg;
of_msg = (ofconn->blocked
? ofconn->blocked
: rconn_recv(ofconn->rconn));
if (!of_msg) {
break;
}
if (mgr->fail_open) {
fail_open_maybe_recover(mgr->fail_open);
}
if (handle_openflow(ofconn, of_msg)) {
ofpbuf_delete(of_msg);
ofconn->blocked = NULL;
} else {
ofconn->blocked = of_msg;
ofconn->retry = false;
}
}
}
if (!rconn_is_alive(ofconn->rconn)) {
ofconn_destroy(ofconn);
} else if (!rconn_is_connected(ofconn->rconn)) {
ofconn_flush(ofconn);
}
}
static void
ofconn_wait(struct ofconn *ofconn, bool handling_openflow)
{
int i;
for (i = 0; i < N_SCHEDULERS; i++) {
pinsched_wait(ofconn->schedulers[i]);
}
rconn_run_wait(ofconn->rconn);
if (handling_openflow && ofconn_may_recv(ofconn)) {
rconn_recv_wait(ofconn->rconn);
}
}
/* Returns true if 'ofconn' should receive asynchronous messages. */
static bool
ofconn_receives_async_msgs(const struct ofconn *ofconn)
{
if (!rconn_is_connected(ofconn->rconn)) {
return false;
} else if (ofconn->type == OFCONN_PRIMARY) {
/* Primary controllers always get asynchronous messages unless they
* have configured themselves as "slaves". */
return ofconn->role != NX_ROLE_SLAVE;
} else {
/* Service connections don't get asynchronous messages unless they have
* explicitly asked for them by setting a nonzero miss send length. */
return ofconn->miss_send_len > 0;
}
}
/* Returns a human-readable name for an OpenFlow connection between 'mgr' and
* 'target', suitable for use in log messages for identifying the connection.
*
* The name is dynamically allocated. The caller should free it (with free())
* when it is no longer needed. */
static char *
ofconn_make_name(const struct connmgr *mgr, const char *target)
{
return xasprintf("%s<->%s", mgr->name, target);
}
static void
ofconn_set_rate_limit(struct ofconn *ofconn, int rate, int burst)
{
int i;
for (i = 0; i < N_SCHEDULERS; i++) {
struct pinsched **s = &ofconn->schedulers[i];
if (rate > 0) {
if (!*s) {
*s = pinsched_create(rate, burst);
} else {
pinsched_set_limits(*s, rate, burst);
}
} else {
pinsched_destroy(*s);
*s = NULL;
}
}
}
static void
ofconn_send(const struct ofconn *ofconn, struct ofpbuf *msg,
struct rconn_packet_counter *counter)
{
update_openflow_length(msg);
if (rconn_send(ofconn->rconn, msg, counter)) {
ofpbuf_delete(msg);
}
}
/* Sending asynchronous messages. */
static void schedule_packet_in(struct ofconn *, struct ofputil_packet_in,
const struct flow *, struct ofpbuf *rw_packet);
/* Sends an OFPT_PORT_STATUS message with 'opp' and 'reason' to appropriate
* controllers managed by 'mgr'. */
void
connmgr_send_port_status(struct connmgr *mgr, const struct ofp_phy_port *opp,
uint8_t reason)
{
/* XXX Should limit the number of queued port status change messages. */
struct ofconn *ofconn;
LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
struct ofp_port_status *ops;
struct ofpbuf *b;
/* Primary controllers, even slaves, should always get port status
updates. Otherwise obey ofconn_receives_async_msgs(). */
if (ofconn->type != OFCONN_PRIMARY
&& !ofconn_receives_async_msgs(ofconn)) {
continue;
}
ops = make_openflow_xid(sizeof *ops, OFPT_PORT_STATUS, 0, &b);
ops->reason = reason;
ops->desc = *opp;
ofconn_send(ofconn, b, NULL);
}
}
/* Sends an OFPT_FLOW_REMOVED or NXT_FLOW_REMOVED message based on 'fr' to
* appropriate controllers managed by 'mgr'. */
void
connmgr_send_flow_removed(struct connmgr *mgr,
const struct ofputil_flow_removed *fr)
{
struct ofconn *ofconn;
LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
struct ofpbuf *msg;
if (!ofconn_receives_async_msgs(ofconn)) {
continue;
}
/* Account flow expirations as replies to OpenFlow requests. That
* works because preventing OpenFlow requests from being processed also
* prevents new flows from being added (and expiring). (It also
* prevents processing OpenFlow requests that would not add new flows,
* so it is imperfect.) */
msg = ofputil_encode_flow_removed(fr, ofconn->flow_format);
ofconn_send_reply(ofconn, msg);
}
}
/* Given 'pin', sends an OFPT_PACKET_IN message to each OpenFlow controller as
* necessary according to their individual configurations.
*
* 'rw_packet' may be NULL. Otherwise, 'rw_packet' must contain the same data
* as pin->packet. (rw_packet == pin->packet is also valid.) Ownership of
* 'rw_packet' is transferred to this function. */
void
connmgr_send_packet_in(struct connmgr *mgr,
const struct ofputil_packet_in *pin,
const struct flow *flow, struct ofpbuf *rw_packet)
{
struct ofconn *ofconn, *prev;
prev = NULL;
LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
if (ofconn_receives_async_msgs(ofconn)) {
if (prev) {
schedule_packet_in(prev, *pin, flow, NULL);
}
prev = ofconn;
}
}
if (prev) {
schedule_packet_in(prev, *pin, flow, rw_packet);
} else {
ofpbuf_delete(rw_packet);
}
}
/* pinsched callback for sending 'ofp_packet_in' on 'ofconn'. */
static void
do_send_packet_in(struct ofpbuf *ofp_packet_in, void *ofconn_)
{
struct ofconn *ofconn = ofconn_;
rconn_send_with_limit(ofconn->rconn, ofp_packet_in,
ofconn->packet_in_counter, 100);
}
/* Takes 'pin', whose packet has the flow specified by 'flow', composes an
* OpenFlow packet-in message from it, and passes it to 'ofconn''s packet
* scheduler for sending.
*
* 'rw_packet' may be NULL. Otherwise, 'rw_packet' must contain the same data
* as pin->packet. (rw_packet == pin->packet is also valid.) Ownership of
* 'rw_packet' is transferred to this function. */
static void
schedule_packet_in(struct ofconn *ofconn, struct ofputil_packet_in pin,
const struct flow *flow, struct ofpbuf *rw_packet)
{
struct connmgr *mgr = ofconn->connmgr;
/* Get OpenFlow buffer_id. */
if (pin.reason == OFPR_ACTION) {
pin.buffer_id = UINT32_MAX;
} else if (mgr->fail_open && fail_open_is_active(mgr->fail_open)) {
pin.buffer_id = pktbuf_get_null();
} else if (!ofconn->pktbuf) {
pin.buffer_id = UINT32_MAX;
} else {
pin.buffer_id = pktbuf_save(ofconn->pktbuf, pin.packet, flow->in_port);
}
/* Figure out how much of the packet to send. */
if (pin.reason == OFPR_NO_MATCH) {
pin.send_len = pin.packet->size;
} else {
/* Caller should have initialized 'send_len' to 'max_len' specified in
* struct ofp_action_output. */
}
if (pin.buffer_id != UINT32_MAX) {
pin.send_len = MIN(pin.send_len, ofconn->miss_send_len);
}
/* Make OFPT_PACKET_IN and hand over to packet scheduler. It might
* immediately call into do_send_packet_in() or it might buffer it for a
* while (until a later call to pinsched_run()). */
pinsched_send(ofconn->schedulers[pin.reason == OFPR_NO_MATCH ? 0 : 1],
flow->in_port, ofputil_encode_packet_in(&pin, rw_packet),
do_send_packet_in, ofconn);
}
/* Fail-open settings. */
/* Returns the failure handling mode (OFPROTO_FAIL_SECURE or
* OFPROTO_FAIL_STANDALONE) for 'mgr'. */
enum ofproto_fail_mode
connmgr_get_fail_mode(const struct connmgr *mgr)
{
return mgr->fail_mode;
}
/* Sets the failure handling mode for 'mgr' to 'fail_mode' (either
* OFPROTO_FAIL_SECURE or OFPROTO_FAIL_STANDALONE). */
void
connmgr_set_fail_mode(struct connmgr *mgr, enum ofproto_fail_mode fail_mode)
{
if (mgr->fail_mode != fail_mode) {
mgr->fail_mode = fail_mode;
update_fail_open(mgr);
if (!connmgr_has_controllers(mgr)) {
ofproto_flush_flows(mgr->ofproto);
}
}
}
/* Fail-open implementation. */
/* Returns the longest probe interval among the primary controllers configured
* on 'mgr'. Returns 0 if there are no primary controllers. */
int
connmgr_get_max_probe_interval(const struct connmgr *mgr)
{
const struct ofconn *ofconn;
int max_probe_interval;
max_probe_interval = 0;
HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
int probe_interval = rconn_get_probe_interval(ofconn->rconn);
max_probe_interval = MAX(max_probe_interval, probe_interval);
}
return max_probe_interval;
}
/* Returns the number of seconds for which all of 'mgr's primary controllers
* have been disconnected. Returns 0 if 'mgr' has no primary controllers. */
int
connmgr_failure_duration(const struct connmgr *mgr)
{
const struct ofconn *ofconn;
int min_failure_duration;
if (!connmgr_has_controllers(mgr)) {
return 0;
}
min_failure_duration = INT_MAX;
HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
int failure_duration = rconn_failure_duration(ofconn->rconn);
min_failure_duration = MIN(min_failure_duration, failure_duration);
}
return min_failure_duration;
}
/* Returns true if at least one primary controller is connected (regardless of
* whether those controllers are believed to have authenticated and accepted
* this switch), false if none of them are connected. */
bool
connmgr_is_any_controller_connected(const struct connmgr *mgr)
{
const struct ofconn *ofconn;
HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
if (rconn_is_connected(ofconn->rconn)) {
return true;
}
}
return false;
}
/* Returns true if at least one primary controller is believed to have
* authenticated and accepted this switch, false otherwise. */
bool
connmgr_is_any_controller_admitted(const struct connmgr *mgr)
{
const struct ofconn *ofconn;
HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
if (rconn_is_admitted(ofconn->rconn)) {
return true;
}
}
return false;
}
/* Sends 'packet' to each controller connected to 'mgr'. Takes ownership of
* 'packet'. */
void
connmgr_broadcast(struct connmgr *mgr, struct ofpbuf *packet)
{
struct ofconn *ofconn, *prev;
prev = NULL;
LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
if (prev) {
ofconn_send_reply(ofconn, ofpbuf_clone(packet));
}
if (rconn_is_connected(ofconn->rconn)) {
prev = ofconn;
}
}
if (prev) {
ofconn_send_reply(prev, packet);
} else {
ofpbuf_delete(packet);
}
}
/* In-band configuration. */
static bool any_extras_changed(const struct connmgr *,
const struct sockaddr_in *extras, size_t n);
/* Sets the 'n' TCP port addresses in 'extras' as ones to which 'mgr''s
* in-band control should guarantee access, in the same way that in-band
* control guarantees access to OpenFlow controllers. */
void
connmgr_set_extra_in_band_remotes(struct connmgr *mgr,
const struct sockaddr_in *extras, size_t n)
{
if (!any_extras_changed(mgr, extras, n)) {
return;
}
free(mgr->extra_in_band_remotes);
mgr->n_extra_remotes = n;
mgr->extra_in_band_remotes = xmemdup(extras, n * sizeof *extras);
update_in_band_remotes(mgr);
}
/* Sets the OpenFlow queue used by flows set up by in-band control on
* 'mgr' to 'queue_id'. If 'queue_id' is negative, then in-band control
* flows will use the default queue. */
void
connmgr_set_in_band_queue(struct connmgr *mgr, int queue_id)
{
if (queue_id != mgr->in_band_queue) {
mgr->in_band_queue = queue_id;
update_in_band_remotes(mgr);
}
}
static bool
any_extras_changed(const struct connmgr *mgr,
const struct sockaddr_in *extras, size_t n)
{
size_t i;
if (n != mgr->n_extra_remotes) {
return true;
}
for (i = 0; i < n; i++) {
const struct sockaddr_in *old = &mgr->extra_in_band_remotes[i];
const struct sockaddr_in *new = &extras[i];
if (old->sin_addr.s_addr != new->sin_addr.s_addr ||
old->sin_port != new->sin_port) {
return true;
}
}
return false;
}
/* In-band implementation. */
bool
connmgr_msg_in_hook(struct connmgr *mgr, const struct flow *flow,
const struct ofpbuf *packet)
{
return mgr->in_band && in_band_msg_in_hook(mgr->in_band, flow, packet);
}
bool
connmgr_may_set_up_flow(struct connmgr *mgr, const struct flow *flow,
const struct nlattr *odp_actions,
size_t actions_len)
{
return !mgr->in_band || in_band_rule_check(flow, odp_actions, actions_len);
}
/* Fail-open and in-band implementation. */
/* Called by 'ofproto' after all flows have been flushed, to allow fail-open
* and standalone mode to re-create their flows.
*
* In-band control has more sophisticated code that manages flows itself. */
void
connmgr_flushed(struct connmgr *mgr)
{
if (mgr->fail_open) {
fail_open_flushed(mgr->fail_open);
}
/* If there are no controllers and we're in standalone mode, set up a flow
* that matches every packet and directs them to OFPP_NORMAL (which goes to
* us). Otherwise, the switch is in secure mode and we won't pass any
* traffic until a controller has been defined and it tells us to do so. */
if (!connmgr_has_controllers(mgr)
&& mgr->fail_mode == OFPROTO_FAIL_STANDALONE) {
union ofp_action action;
struct cls_rule rule;
memset(&action, 0, sizeof action);
action.type = htons(OFPAT_OUTPUT);
action.output.len = htons(sizeof action);
action.output.port = htons(OFPP_NORMAL);
cls_rule_init_catchall(&rule, 0);
ofproto_add_flow(mgr->ofproto, &rule, &action, 1);
}
}
/* Creates a new ofservice for 'target' in 'mgr'. Returns 0 if successful,
* otherwise a positive errno value.
*
* ofservice_reconfigure() must be called to fully configure the new
* ofservice. */
static int
ofservice_create(struct connmgr *mgr, const char *target)
{
struct ofservice *ofservice;
struct pvconn *pvconn;
int error;
error = pvconn_open(target, &pvconn);
if (error) {
return error;
}
ofservice = xzalloc(sizeof *ofservice);
hmap_insert(&mgr->services, &ofservice->node, hash_string(target, 0));
ofservice->pvconn = pvconn;
return 0;
}
static void
ofservice_destroy(struct connmgr *mgr, struct ofservice *ofservice)
{
hmap_remove(&mgr->services, &ofservice->node);
pvconn_close(ofservice->pvconn);
free(ofservice);
}
static void
ofservice_reconfigure(struct ofservice *ofservice,
const struct ofproto_controller *c)
{
ofservice->probe_interval = c->probe_interval;
ofservice->rate_limit = c->rate_limit;
ofservice->burst_limit = c->burst_limit;
}
/* Finds and returns the ofservice within 'mgr' that has the given
* 'target', or a null pointer if none exists. */
static struct ofservice *
ofservice_lookup(struct connmgr *mgr, const char *target)
{
struct ofservice *ofservice;
HMAP_FOR_EACH_WITH_HASH (ofservice, node, hash_string(target, 0),
&mgr->services) {
if (!strcmp(pvconn_get_name(ofservice->pvconn), target)) {
return ofservice;
}
}
return NULL;
}
|