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Check reference to failover path before use in active-backup scenario

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This commit is contained in:
Joseph Henry 2022-04-17 21:03:57 -07:00
parent fe376f6a1e
commit 7e4da53c0b
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GPG Key ID: C45B33FF5EBC9344
1 changed files with 29 additions and 23 deletions
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20
node/Bond.cpp
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@ -1291,6 +1291,7 @@ void Bond::processActiveBackupTasks(void* tPtr, int64_t now)
if (_paths[i].preferred()) {
_abPathIdx = i;
bFoundPrimaryLink = true;
if (_paths[_abPathIdx].p) {
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[_abPathIdx].p->localSocket());
if (link) {
log("found preferred primary link %s", pathToStr(_paths[_abPathIdx].p).c_str());
@ -1299,6 +1300,7 @@ void Bond::processActiveBackupTasks(void* tPtr, int64_t now)
}
}
}
}
if (bFoundPrimaryLink && nonPreferredPathIdx) {
log("found non-preferred primary link");
_abPathIdx = nonPreferredPathIdx;
@ -1317,6 +1319,7 @@ void Bond::processActiveBackupTasks(void* tPtr, int64_t now)
}
}
if (_abPathIdx != ZT_MAX_PEER_NETWORK_PATHS) {
if (_paths[_abPathIdx].p) {
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[_abPathIdx].p->localSocket());
if (link) {
log("select non-primary link %s", pathToStr(_paths[_abPathIdx].p).c_str());
@ -1325,9 +1328,10 @@ void Bond::processActiveBackupTasks(void* tPtr, int64_t now)
}
}
}
}
// Short-circuit if we don't have an active link yet
if (_abPathIdx == ZT_MAX_PEER_NETWORK_PATHS) {
// Short-circuit if we don't have an active link yet. Everything below is optimization from the base case
if (_abPathIdx < 0 || _abPathIdx == ZT_MAX_PEER_NETWORK_PATHS || (!_paths[_abPathIdx].p)) {
return;
}
@ -1393,10 +1397,11 @@ void Bond::processActiveBackupTasks(void* tPtr, int64_t now)
}
}
}
if (_paths[i].p) {
if (_paths[i].p.ptr() != _paths[_abPathIdx].p.ptr()) {
bool bFoundPathInQueue = false;
for (std::deque<int>::iterator it(_abFailoverQueue.begin()); it != _abFailoverQueue.end(); ++it) {
if (_paths[i].p.ptr() == _paths[(*it)].p.ptr()) {
if (_paths[(*it)].p && (_paths[i].p.ptr() == _paths[(*it)].p.ptr())) {
bFoundPathInQueue = true;
}
}
@ -1408,6 +1413,7 @@ void Bond::processActiveBackupTasks(void* tPtr, int64_t now)
}
}
}
}
/**
* No failover instructions provided by user, build queue according to performance
* and IPv preference.
@ -1476,7 +1482,7 @@ void Bond::processActiveBackupTasks(void* tPtr, int64_t now)
/**
* Fulfill primary re-select obligations
*/
if (_paths[_abPathIdx].p && ! _paths[_abPathIdx].eligible) { // Implicit ZT_BOND_RESELECTION_POLICY_FAILURE
if (! _paths[_abPathIdx].eligible) { // Implicit ZT_BOND_RESELECTION_POLICY_FAILURE
log("link %s has failed, select link from failover queue (%zu links in queue)", pathToStr(_paths[_abPathIdx].p).c_str(), _abFailoverQueue.size());
if (! _abFailoverQueue.empty()) {
dequeueNextActiveBackupPath(now);
@ -1493,15 +1499,15 @@ void Bond::processActiveBackupTasks(void* tPtr, int64_t now)
_lastActiveBackupPathChange = now;
}
if (_abLinkSelectMethod == ZT_BOND_RESELECTION_POLICY_ALWAYS) {
if (_paths[_abPathIdx].p && ! getLink(_paths[_abPathIdx].p)->primary() && getLink(_paths[_abFailoverQueue.front()].p)->primary()) {
if (! getLink(_paths[_abPathIdx].p)->primary() && _paths[_abFailoverQueue.front()].p && getLink(_paths[_abFailoverQueue.front()].p)->primary()) {
dequeueNextActiveBackupPath(now);
log("switch back to available primary link %s (select mode: always)", pathToStr(_paths[_abPathIdx].p).c_str());
}
}
if (_abLinkSelectMethod == ZT_BOND_RESELECTION_POLICY_BETTER) {
if (_paths[_abPathIdx].p && ! getLink(_paths[_abPathIdx].p)->primary()) {
if (! getLink(_paths[_abPathIdx].p)->primary()) {
// Active backup has switched to "better" primary link according to re-select policy.
if (getLink(_paths[_abFailoverQueue.front()].p)->primary() && (_paths[_abFailoverQueue.front()].failoverScore > _paths[_abPathIdx].failoverScore)) {
if (_paths[_abFailoverQueue.front()].p && getLink(_paths[_abFailoverQueue.front()].p)->primary() && (_paths[_abFailoverQueue.front()].failoverScore > _paths[_abPathIdx].failoverScore)) {
dequeueNextActiveBackupPath(now);
log("switch back to user-defined primary link %s (select mode: better)", pathToStr(_paths[_abPathIdx].p).c_str());
}