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
|
/*
* Copyright (c) 2014 Red Hat, Inc.
*
* Based on mac-learning implementation.
*
* 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 "mcast-snooping.h"
#include <inttypes.h>
#include <stdlib.h>
#include "bitmap.h"
#include "byte-order.h"
#include "coverage.h"
#include "hash.h"
#include "openvswitch/list.h"
#include "openvswitch/poll-loop.h"
#include "timeval.h"
#include "entropy.h"
#include "unaligned.h"
#include "util.h"
#include "vlan-bitmap.h"
#include "openvswitch/vlog.h"
COVERAGE_DEFINE(mcast_snooping_learned);
COVERAGE_DEFINE(mcast_snooping_expired);
static struct mcast_port_bundle *
mcast_snooping_port_lookup(struct ovs_list *list, void *port);
static struct mcast_mrouter_bundle *
mcast_snooping_mrouter_lookup(struct mcast_snooping *ms, uint16_t vlan,
void *port)
OVS_REQ_RDLOCK(ms->rwlock);
bool
mcast_snooping_enabled(const struct mcast_snooping *ms)
{
return !!ms;
}
bool
mcast_snooping_flood_unreg(const struct mcast_snooping *ms)
{
return ms->flood_unreg;
}
char *
mcast_snooping_group_protocol_str(enum mcast_group_proto grp_proto)
{
switch (grp_proto) {
case MCAST_GROUP_IGMPV1:
return "IGMPv1";
break;
case MCAST_GROUP_IGMPV2:
return "IGMPv2";
break;
case MCAST_GROUP_IGMPV3:
return "IGMPv3";
break;
case MCAST_GROUP_MLDV1:
return "MLDv1";
break;
case MCAST_GROUP_MLDV2:
return "MLDv2";
break;
default:
return "UNKNOWN";
}
}
bool
mcast_snooping_is_query(ovs_be16 igmp_type)
{
return igmp_type == htons(IGMP_HOST_MEMBERSHIP_QUERY);
}
bool
mcast_snooping_is_membership(ovs_be16 igmp_type)
{
switch (ntohs(igmp_type)) {
case IGMP_HOST_MEMBERSHIP_REPORT:
case IGMPV2_HOST_MEMBERSHIP_REPORT:
case IGMPV3_HOST_MEMBERSHIP_REPORT:
case IGMP_HOST_LEAVE_MESSAGE:
return true;
}
return false;
}
/* Returns the number of seconds since multicast group 'b' was learned in a
* port on 'ms'. */
int
mcast_bundle_age(const struct mcast_snooping *ms,
const struct mcast_group_bundle *b)
{
time_t remaining = b->expires - time_now();
return ms->idle_time - remaining;
}
static uint32_t
mcast_table_hash(const struct mcast_snooping *ms,
const struct in6_addr *grp_addr, uint16_t vlan)
{
return hash_bytes(grp_addr->s6_addr, 16,
hash_2words(ms->secret, vlan));
}
static struct mcast_group_bundle *
mcast_group_bundle_from_lru_node(struct ovs_list *list)
{
return CONTAINER_OF(list, struct mcast_group_bundle, bundle_node);
}
static struct mcast_group *
mcast_group_from_lru_node(struct ovs_list *list)
{
return CONTAINER_OF(list, struct mcast_group, group_node);
}
/* Searches 'ms' for and returns an mcast group for destination address
* 'dip' in 'vlan'. */
struct mcast_group *
mcast_snooping_lookup(const struct mcast_snooping *ms,
const struct in6_addr *dip, uint16_t vlan)
OVS_REQ_RDLOCK(ms->rwlock)
{
struct mcast_group *grp;
uint32_t hash;
hash = mcast_table_hash(ms, dip, vlan);
HMAP_FOR_EACH_WITH_HASH (grp, hmap_node, hash, &ms->table) {
if (grp->vlan == vlan && ipv6_addr_equals(&grp->addr, dip)) {
return grp;
}
}
return NULL;
}
struct mcast_group *
mcast_snooping_lookup4(const struct mcast_snooping *ms, ovs_be32 ip4,
uint16_t vlan)
OVS_REQ_RDLOCK(ms->rwlock)
{
struct in6_addr addr = in6_addr_mapped_ipv4(ip4);
return mcast_snooping_lookup(ms, &addr, vlan);
}
/* If the LRU list is not empty, stores the least-recently-used entry
* in '*e' and returns true. Otherwise, if the LRU list is empty,
* stores NULL in '*e' and return false. */
static bool
group_get_lru(const struct mcast_snooping *ms, struct mcast_group **grp)
OVS_REQ_RDLOCK(ms->rwlock)
{
if (!ovs_list_is_empty(&ms->group_lru)) {
*grp = mcast_group_from_lru_node(ms->group_lru.next);
return true;
} else {
*grp = NULL;
return false;
}
}
static unsigned int
normalize_idle_time(unsigned int idle_time)
{
return (idle_time < 15 ? 15
: idle_time > 3600 ? 3600
: idle_time);
}
/* Creates and returns a new mcast table with an initial mcast aging
* timeout of MCAST_ENTRY_DEFAULT_IDLE_TIME seconds and an initial maximum of
* MCAST_DEFAULT_MAX entries. */
struct mcast_snooping *
mcast_snooping_create(void)
{
struct mcast_snooping *ms;
ms = xmalloc(sizeof *ms);
hmap_init(&ms->table);
ovs_list_init(&ms->group_lru);
ovs_list_init(&ms->mrouter_lru);
ovs_list_init(&ms->fport_list);
ovs_list_init(&ms->rport_list);
ms->secret = random_uint32();
ms->idle_time = MCAST_ENTRY_DEFAULT_IDLE_TIME;
ms->max_entries = MCAST_DEFAULT_MAX_ENTRIES;
ms->need_revalidate = false;
ms->flood_unreg = true;
ovs_refcount_init(&ms->ref_cnt);
ovs_rwlock_init(&ms->rwlock);
return ms;
}
struct mcast_snooping *
mcast_snooping_ref(const struct mcast_snooping *ms_)
{
struct mcast_snooping *ms = CONST_CAST(struct mcast_snooping *, ms_);
if (ms) {
ovs_refcount_ref(&ms->ref_cnt);
}
return ms;
}
/* Unreferences (and possibly destroys) mcast snooping table 'ms'. */
void
mcast_snooping_unref(struct mcast_snooping *ms)
{
if (!mcast_snooping_enabled(ms)) {
return;
}
if (ovs_refcount_unref_relaxed(&ms->ref_cnt) == 1) {
mcast_snooping_flush(ms);
hmap_destroy(&ms->table);
ovs_rwlock_destroy(&ms->rwlock);
free(ms);
}
}
/* Changes the mcast aging timeout of 'ms' to 'idle_time' seconds. */
void
mcast_snooping_set_idle_time(struct mcast_snooping *ms, unsigned int idle_time)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct mcast_group *grp;
struct mcast_group_bundle *b;
int delta;
idle_time = normalize_idle_time(idle_time);
if (idle_time != ms->idle_time) {
delta = (int) idle_time - (int) ms->idle_time;
LIST_FOR_EACH (grp, group_node, &ms->group_lru) {
LIST_FOR_EACH (b, bundle_node, &grp->bundle_lru) {
b->expires += delta;
}
}
ms->idle_time = idle_time;
}
}
/* Sets the maximum number of entries in 'ms' to 'max_entries', adjusting it
* to be within a reasonable range. */
void
mcast_snooping_set_max_entries(struct mcast_snooping *ms,
size_t max_entries)
OVS_REQ_WRLOCK(ms->rwlock)
{
ms->max_entries = (max_entries < 10 ? 10
: max_entries > 1000 * 1000 ? 1000 * 1000
: max_entries);
}
/* Sets if unregistered multicast packets should be flooded to
* all ports or only to ports connected to multicast routers
*
* Returns true if previous state differs from current state,
* false otherwise. */
bool
mcast_snooping_set_flood_unreg(struct mcast_snooping *ms, bool enable)
OVS_REQ_WRLOCK(ms->rwlock)
{
bool prev = ms->flood_unreg;
ms->flood_unreg = enable;
return prev != enable;
}
static struct mcast_group_bundle *
mcast_group_bundle_lookup(struct mcast_snooping *ms OVS_UNUSED,
struct mcast_group *grp, void *port)
OVS_REQ_RDLOCK(ms->rwlock)
{
struct mcast_group_bundle *b;
LIST_FOR_EACH (b, bundle_node, &grp->bundle_lru) {
if (b->port == port) {
return b;
}
}
return NULL;
}
/* Insert a new bundle to the mcast group or update its
* position and expiration if it is already there. */
static struct mcast_group_bundle *
mcast_group_insert_bundle(struct mcast_snooping *ms OVS_UNUSED,
struct mcast_group *grp, void *port, int idle_time)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct mcast_group_bundle *b;
b = mcast_group_bundle_lookup(ms, grp, port);
if (b) {
ovs_list_remove(&b->bundle_node);
} else {
b = xmalloc(sizeof *b);
ovs_list_init(&b->bundle_node);
b->port = port;
ms->need_revalidate = true;
}
b->expires = time_now() + idle_time;
ovs_list_push_back(&grp->bundle_lru, &b->bundle_node);
return b;
}
/* Return true if multicast still has bundles associated.
* Return false if there is no bundles. */
static bool
mcast_group_has_bundles(struct mcast_group *grp)
{
return !ovs_list_is_empty(&grp->bundle_lru);
}
/* Delete 'grp' from the 'ms' hash table.
* Caller is responsible to clean bundle lru first. */
static void
mcast_snooping_flush_group__(struct mcast_snooping *ms,
struct mcast_group *grp)
{
ovs_assert(ovs_list_is_empty(&grp->bundle_lru));
hmap_remove(&ms->table, &grp->hmap_node);
ovs_list_remove(&grp->group_node);
free(grp);
}
/* Flush out mcast group and its bundles */
static void
mcast_snooping_flush_group(struct mcast_snooping *ms, struct mcast_group *grp)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct mcast_group_bundle *b;
LIST_FOR_EACH_POP (b, bundle_node, &grp->bundle_lru) {
free(b);
}
mcast_snooping_flush_group__(ms, grp);
ms->need_revalidate = true;
}
/* Delete bundle returning true if it succeeds,
* false if it didn't find the group. */
static bool
mcast_group_delete_bundle(struct mcast_snooping *ms OVS_UNUSED,
struct mcast_group *grp, void *port)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct mcast_group_bundle *b;
LIST_FOR_EACH (b, bundle_node, &grp->bundle_lru) {
if (b->port == port) {
ovs_list_remove(&b->bundle_node);
free(b);
return true;
}
}
return false;
}
/* If any bundle has expired, delete it. Returns the number of deleted
* bundles. */
static int
mcast_snooping_prune_expired(struct mcast_snooping *ms,
struct mcast_group *grp)
OVS_REQ_WRLOCK(ms->rwlock)
{
int expired;
struct mcast_group_bundle *b;
time_t timenow = time_now();
expired = 0;
LIST_FOR_EACH_SAFE (b, bundle_node, &grp->bundle_lru) {
/* This list is sorted on expiration time. */
if (b->expires > timenow) {
break;
}
ovs_list_remove(&b->bundle_node);
free(b);
expired++;
}
if (!mcast_group_has_bundles(grp)) {
mcast_snooping_flush_group__(ms, grp);
expired++;
}
if (expired) {
ms->need_revalidate = true;
COVERAGE_ADD(mcast_snooping_expired, expired);
}
return expired;
}
/* Add a multicast group to the mdb. If it exists, then
* move to the last position in the LRU list.
*/
bool
mcast_snooping_add_group(struct mcast_snooping *ms,
const struct in6_addr *addr,
uint16_t vlan, void *port,
enum mcast_group_proto grp_proto)
OVS_REQ_WRLOCK(ms->rwlock)
{
bool learned;
struct mcast_group *grp;
/* Avoid duplicate packets. */
if (mcast_snooping_mrouter_lookup(ms, vlan, port)
|| mcast_snooping_port_lookup(&ms->fport_list, port)) {
return false;
}
learned = false;
grp = mcast_snooping_lookup(ms, addr, vlan);
if (!grp) {
uint32_t hash = mcast_table_hash(ms, addr, vlan);
if (hmap_count(&ms->table) >= ms->max_entries) {
if (!group_get_lru(ms, &grp)) {
return false;
}
mcast_snooping_flush_group(ms, grp);
}
grp = xmalloc(sizeof *grp);
hmap_insert(&ms->table, &grp->hmap_node, hash);
grp->addr = *addr;
grp->vlan = vlan;
ovs_list_init(&grp->bundle_lru);
learned = true;
ms->need_revalidate = true;
COVERAGE_INC(mcast_snooping_learned);
} else {
ovs_list_remove(&grp->group_node);
}
mcast_group_insert_bundle(ms, grp, port, ms->idle_time);
/* update the protocol version. */
grp->protocol_version = grp_proto;
/* Mark 'grp' as recently used. */
ovs_list_push_back(&ms->group_lru, &grp->group_node);
return learned;
}
bool
mcast_snooping_add_group4(struct mcast_snooping *ms, ovs_be32 ip4,
uint16_t vlan, void *port,
enum mcast_group_proto grp_proto)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct in6_addr addr = in6_addr_mapped_ipv4(ip4);
return mcast_snooping_add_group(ms, &addr, vlan, port, grp_proto);
}
int
mcast_snooping_add_report(struct mcast_snooping *ms,
const struct dp_packet *p,
uint16_t vlan, void *port)
{
ovs_be32 ip4;
size_t offset;
const struct igmpv3_header *igmpv3;
const struct igmpv3_record *record;
int count = 0;
int ngrp;
offset = (char *) dp_packet_l4(p) - (char *) dp_packet_data(p);
igmpv3 = dp_packet_at(p, offset, IGMPV3_HEADER_LEN);
if (!igmpv3) {
return 0;
}
ngrp = ntohs(igmpv3->ngrp);
offset += IGMPV3_HEADER_LEN;
while (ngrp--) {
bool ret;
record = dp_packet_at(p, offset, sizeof(struct igmpv3_record));
if (!record) {
break;
}
/* Only consider known record types. */
if (record->type < IGMPV3_MODE_IS_INCLUDE
|| record->type > IGMPV3_BLOCK_OLD_SOURCES) {
continue;
}
ip4 = get_16aligned_be32(&record->maddr);
/*
* If record is INCLUDE MODE and there are no sources, it's equivalent
* to a LEAVE.
*/
if (ntohs(record->nsrcs) == 0
&& (record->type == IGMPV3_MODE_IS_INCLUDE
|| record->type == IGMPV3_CHANGE_TO_INCLUDE_MODE)) {
ret = mcast_snooping_leave_group4(ms, ip4, vlan, port);
} else {
ret = mcast_snooping_add_group4(ms, ip4, vlan, port,
MCAST_GROUP_IGMPV3);
}
if (ret) {
count++;
}
offset += sizeof(*record)
+ ntohs(record->nsrcs) * sizeof(ovs_be32) + record->aux_len;
}
return count;
}
int
mcast_snooping_add_mld(struct mcast_snooping *ms,
const struct dp_packet *p,
uint16_t vlan, void *port)
{
const struct in6_addr *addr;
size_t offset;
const struct mld_header *mld;
const struct mld2_record *record;
int count = 0;
int ngrp;
bool ret;
offset = (char *) dp_packet_l4(p) - (char *) dp_packet_data(p);
mld = dp_packet_at(p, offset, MLD_HEADER_LEN);
if (!mld) {
return 0;
}
ngrp = ntohs(mld->ngrp);
offset += MLD_HEADER_LEN;
addr = dp_packet_at(p, offset, sizeof(struct in6_addr));
switch (mld->type) {
case MLD_REPORT:
ret = mcast_snooping_add_group(ms, addr, vlan, port,
MCAST_GROUP_MLDV1);
if (ret) {
count++;
}
break;
case MLD_DONE:
ret = mcast_snooping_leave_group(ms, addr, vlan, port);
if (ret) {
count++;
}
break;
case MLD2_REPORT:
while (ngrp--) {
record = dp_packet_at(p, offset, sizeof(struct mld2_record));
if (!record) {
break;
}
/* Only consider known record types. */
if (record->type >= IGMPV3_MODE_IS_INCLUDE
&& record->type <= IGMPV3_BLOCK_OLD_SOURCES) {
struct in6_addr maddr;
memcpy(maddr.s6_addr, record->maddr.be16, 16);
addr = &maddr;
/*
* If record is INCLUDE MODE and there are no sources, it's
* equivalent to a LEAVE.
*/
if (record->nsrcs == htons(0)
&& (record->type == IGMPV3_MODE_IS_INCLUDE
|| record->type == IGMPV3_CHANGE_TO_INCLUDE_MODE)) {
ret = mcast_snooping_leave_group(ms, addr, vlan, port);
} else {
ret = mcast_snooping_add_group(ms, addr, vlan, port,
MCAST_GROUP_MLDV2);
}
if (ret) {
count++;
}
}
offset += sizeof(*record)
+ ntohs(record->nsrcs) * sizeof(struct in6_addr)
+ record->aux_len;
}
}
return count;
}
bool
mcast_snooping_leave_group(struct mcast_snooping *ms,
const struct in6_addr *addr,
uint16_t vlan, void *port)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct mcast_group *grp;
/* Ports flagged to forward Reports usually have more
* than one host behind it, so don't leave the group
* on the first message and just let it expire */
if (mcast_snooping_port_lookup(&ms->rport_list, port)) {
return false;
}
grp = mcast_snooping_lookup(ms, addr, vlan);
if (grp && mcast_group_delete_bundle(ms, grp, port)) {
ms->need_revalidate = true;
return true;
}
return false;
}
bool
mcast_snooping_leave_group4(struct mcast_snooping *ms, ovs_be32 ip4,
uint16_t vlan, void *port)
{
struct in6_addr addr = in6_addr_mapped_ipv4(ip4);
return mcast_snooping_leave_group(ms, &addr, vlan, port);
}
/* Router ports. */
/* Returns the number of seconds since the multicast router
* was learned in a port. */
int
mcast_mrouter_age(const struct mcast_snooping *ms OVS_UNUSED,
const struct mcast_mrouter_bundle *mrouter)
{
time_t remaining = mrouter->expires - time_now();
return MCAST_MROUTER_PORT_IDLE_TIME - remaining;
}
static struct mcast_mrouter_bundle *
mcast_mrouter_from_lru_node(struct ovs_list *list)
{
return CONTAINER_OF(list, struct mcast_mrouter_bundle, mrouter_node);
}
/* If the LRU list is not empty, stores the least-recently-used mrouter
* in '*m' and returns true. Otherwise, if the LRU list is empty,
* stores NULL in '*m' and return false. */
static bool
mrouter_get_lru(const struct mcast_snooping *ms,
struct mcast_mrouter_bundle **m)
OVS_REQ_RDLOCK(ms->rwlock)
{
if (!ovs_list_is_empty(&ms->mrouter_lru)) {
*m = mcast_mrouter_from_lru_node(ovs_list_front(&ms->mrouter_lru));
return true;
} else {
*m = NULL;
return false;
}
}
static struct mcast_mrouter_bundle *
mcast_snooping_mrouter_lookup(struct mcast_snooping *ms, uint16_t vlan,
void *port)
OVS_REQ_RDLOCK(ms->rwlock)
{
struct mcast_mrouter_bundle *mrouter;
LIST_FOR_EACH (mrouter, mrouter_node, &ms->mrouter_lru) {
if (mrouter->vlan == vlan && mrouter->port == port) {
return mrouter;
}
}
return NULL;
}
bool
mcast_snooping_add_mrouter(struct mcast_snooping *ms, uint16_t vlan,
void *port)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct mcast_mrouter_bundle *mrouter;
/* Avoid duplicate packets. */
if (mcast_snooping_port_lookup(&ms->fport_list, port)) {
return false;
}
mrouter = mcast_snooping_mrouter_lookup(ms, vlan, port);
if (mrouter) {
ovs_list_remove(&mrouter->mrouter_node);
} else {
mrouter = xmalloc(sizeof *mrouter);
mrouter->vlan = vlan;
mrouter->port = port;
COVERAGE_INC(mcast_snooping_learned);
ms->need_revalidate = true;
}
mrouter->expires = time_now() + MCAST_MROUTER_PORT_IDLE_TIME;
ovs_list_push_back(&ms->mrouter_lru, &mrouter->mrouter_node);
return ms->need_revalidate;
}
static void
mcast_snooping_flush_mrouter(struct mcast_mrouter_bundle *mrouter)
{
ovs_list_remove(&mrouter->mrouter_node);
free(mrouter);
}
/* Ports */
static struct mcast_port_bundle *
mcast_port_from_list_node(struct ovs_list *list)
{
return CONTAINER_OF(list, struct mcast_port_bundle, node);
}
/* If the list is not empty, stores the fport in '*f' and returns true.
* Otherwise, if the list is empty, stores NULL in '*f' and return false. */
static bool
mcast_snooping_port_get(const struct ovs_list *list,
struct mcast_port_bundle **f)
{
if (!ovs_list_is_empty(list)) {
*f = mcast_port_from_list_node(ovs_list_front(list));
return true;
} else {
*f = NULL;
return false;
}
}
static struct mcast_port_bundle *
mcast_snooping_port_lookup(struct ovs_list *list, void *port)
{
struct mcast_port_bundle *pbundle;
LIST_FOR_EACH (pbundle, node, list) {
if (pbundle->port == port) {
return pbundle;
}
}
return NULL;
}
static void
mcast_snooping_add_port(struct ovs_list *list, void *port)
{
struct mcast_port_bundle *pbundle;
pbundle = xmalloc(sizeof *pbundle);
pbundle->port = port;
ovs_list_insert(list, &pbundle->node);
}
static void
mcast_snooping_flush_port(struct mcast_port_bundle *pbundle)
{
ovs_list_remove(&pbundle->node);
free(pbundle);
}
/* Flood ports. */
void
mcast_snooping_set_port_flood(struct mcast_snooping *ms, void *port,
bool flood)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct mcast_port_bundle *fbundle;
fbundle = mcast_snooping_port_lookup(&ms->fport_list, port);
if (flood && !fbundle) {
mcast_snooping_add_port(&ms->fport_list, port);
ms->need_revalidate = true;
} else if (!flood && fbundle) {
mcast_snooping_flush_port(fbundle);
ms->need_revalidate = true;
}
}
/* Flood Reports ports. */
void
mcast_snooping_set_port_flood_reports(struct mcast_snooping *ms, void *port,
bool flood)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct mcast_port_bundle *pbundle;
pbundle = mcast_snooping_port_lookup(&ms->rport_list, port);
if (flood && !pbundle) {
mcast_snooping_add_port(&ms->rport_list, port);
ms->need_revalidate = true;
} else if (!flood && pbundle) {
mcast_snooping_flush_port(pbundle);
ms->need_revalidate = true;
}
}
/* Run and flush. */
static void
mcast_snooping_mdb_flush__(struct mcast_snooping *ms)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct mcast_group *grp;
struct mcast_mrouter_bundle *mrouter;
while (group_get_lru(ms, &grp)) {
mcast_snooping_flush_group(ms, grp);
}
hmap_shrink(&ms->table);
while (mrouter_get_lru(ms, &mrouter)) {
mcast_snooping_flush_mrouter(mrouter);
}
}
void
mcast_snooping_mdb_flush(struct mcast_snooping *ms)
{
if (!mcast_snooping_enabled(ms)) {
return;
}
ovs_rwlock_wrlock(&ms->rwlock);
mcast_snooping_mdb_flush__(ms);
ovs_rwlock_unlock(&ms->rwlock);
}
/* Flushes mdb and flood ports. */
static void
mcast_snooping_flush__(struct mcast_snooping *ms)
OVS_REQ_WRLOCK(ms->rwlock)
{
struct mcast_group *grp;
struct mcast_mrouter_bundle *mrouter;
struct mcast_port_bundle *pbundle;
while (group_get_lru(ms, &grp)) {
mcast_snooping_flush_group(ms, grp);
}
hmap_shrink(&ms->table);
/* flush multicast routers */
while (mrouter_get_lru(ms, &mrouter)) {
mcast_snooping_flush_mrouter(mrouter);
}
/* flush flood ports */
while (mcast_snooping_port_get(&ms->fport_list, &pbundle)) {
mcast_snooping_flush_port(pbundle);
}
/* flush flood report ports */
while (mcast_snooping_port_get(&ms->rport_list, &pbundle)) {
mcast_snooping_flush_port(pbundle);
}
}
void
mcast_snooping_flush(struct mcast_snooping *ms)
{
if (!mcast_snooping_enabled(ms)) {
return;
}
ovs_rwlock_wrlock(&ms->rwlock);
mcast_snooping_flush__(ms);
ovs_rwlock_unlock(&ms->rwlock);
}
static bool
mcast_snooping_run__(struct mcast_snooping *ms)
OVS_REQ_WRLOCK(ms->rwlock)
{
bool need_revalidate;
struct mcast_group *grp;
struct mcast_mrouter_bundle *mrouter;
int mrouter_expired;
while (group_get_lru(ms, &grp)) {
if (hmap_count(&ms->table) > ms->max_entries) {
mcast_snooping_flush_group(ms, grp);
} else {
if (!mcast_snooping_prune_expired(ms, grp)) {
break;
}
}
}
hmap_shrink(&ms->table);
mrouter_expired = 0;
while (mrouter_get_lru(ms, &mrouter)
&& time_now() >= mrouter->expires) {
mcast_snooping_flush_mrouter(mrouter);
mrouter_expired++;
}
if (mrouter_expired) {
ms->need_revalidate = true;
COVERAGE_ADD(mcast_snooping_expired, mrouter_expired);
}
need_revalidate = ms->need_revalidate;
ms->need_revalidate = false;
return need_revalidate;
}
/* Does periodic work required by 'ms'. Returns true if something changed
* that may require flow revalidation. */
bool
mcast_snooping_run(struct mcast_snooping *ms)
{
bool need_revalidate;
if (!mcast_snooping_enabled(ms)) {
return false;
}
ovs_rwlock_wrlock(&ms->rwlock);
need_revalidate = mcast_snooping_run__(ms);
ovs_rwlock_unlock(&ms->rwlock);
return need_revalidate;
}
static void
mcast_snooping_wait__(struct mcast_snooping *ms)
OVS_REQ_RDLOCK(ms->rwlock)
{
if (hmap_count(&ms->table) > ms->max_entries
|| ms->need_revalidate) {
poll_immediate_wake();
} else {
struct mcast_group *grp;
struct mcast_group_bundle *bundle;
struct mcast_mrouter_bundle *mrouter;
long long int mrouter_msec;
long long int msec = 0;
if (!ovs_list_is_empty(&ms->group_lru)) {
grp = mcast_group_from_lru_node(ms->group_lru.next);
bundle = mcast_group_bundle_from_lru_node(grp->bundle_lru.next);
msec = bundle->expires * 1000LL;
}
if (!ovs_list_is_empty(&ms->mrouter_lru)) {
mrouter = mcast_mrouter_from_lru_node(ms->mrouter_lru.next);
mrouter_msec = mrouter->expires * 1000LL;
msec = msec ? MIN(msec, mrouter_msec) : mrouter_msec;
}
if (msec) {
poll_timer_wait_until(msec);
}
}
}
void
mcast_snooping_wait(struct mcast_snooping *ms)
{
if (!mcast_snooping_enabled(ms)) {
return;
}
ovs_rwlock_rdlock(&ms->rwlock);
mcast_snooping_wait__(ms);
ovs_rwlock_unlock(&ms->rwlock);
}
void
mcast_snooping_flush_bundle(struct mcast_snooping *ms, void *port)
{
struct mcast_mrouter_bundle *m;
struct mcast_port_bundle *p;
struct mcast_group *g;
if (!mcast_snooping_enabled(ms)) {
return;
}
ovs_rwlock_wrlock(&ms->rwlock);
LIST_FOR_EACH_SAFE (g, group_node, &ms->group_lru) {
if (mcast_group_delete_bundle(ms, g, port)) {
ms->need_revalidate = true;
if (!mcast_group_has_bundles(g)) {
mcast_snooping_flush_group__(ms, g);
}
}
}
LIST_FOR_EACH_SAFE (m, mrouter_node, &ms->mrouter_lru) {
if (m->port == port) {
mcast_snooping_flush_mrouter(m);
ms->need_revalidate = true;
}
}
LIST_FOR_EACH_SAFE (p, node, &ms->fport_list) {
if (p->port == port) {
mcast_snooping_flush_port(p);
ms->need_revalidate = true;
}
}
LIST_FOR_EACH_SAFE (p, node, &ms->rport_list) {
if (p->port == port) {
mcast_snooping_flush_port(p);
ms->need_revalidate = true;
}
}
ovs_rwlock_unlock(&ms->rwlock);
}
|