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-rw-r--r--pkg/tcpip/stack/neighbor_cache.go2
-rw-r--r--pkg/tcpip/stack/neighbor_entry.go37
-rw-r--r--pkg/tcpip/stack/nic.go2
-rw-r--r--pkg/tcpip/stack/pending_packets.go12
-rw-r--r--pkg/tcpip/stack/route.go8
-rw-r--r--pkg/tcpip/stack/stack.go2
6 files changed, 34 insertions, 29 deletions
diff --git a/pkg/tcpip/stack/neighbor_cache.go b/pkg/tcpip/stack/neighbor_cache.go
index 6b1f8da86..509f5ce5c 100644
--- a/pkg/tcpip/stack/neighbor_cache.go
+++ b/pkg/tcpip/stack/neighbor_cache.go
@@ -140,7 +140,7 @@ func (n *neighborCache) entry(remoteAddr, localAddr tcpip.Address, onResolve fun
// a node continues sending packets to that neighbor using the cached
// link-layer address."
if onResolve != nil {
- onResolve(LinkResolutionResult{LinkAddress: entry.mu.neigh.LinkAddr, Success: true})
+ onResolve(LinkResolutionResult{LinkAddress: entry.mu.neigh.LinkAddr, Err: nil})
}
return entry.mu.neigh, nil, nil
case Unknown, Incomplete, Unreachable:
diff --git a/pkg/tcpip/stack/neighbor_entry.go b/pkg/tcpip/stack/neighbor_entry.go
index 36d3cad62..6d95e1664 100644
--- a/pkg/tcpip/stack/neighbor_entry.go
+++ b/pkg/tcpip/stack/neighbor_entry.go
@@ -157,8 +157,8 @@ func newStaticNeighborEntry(cache *neighborCache, addr tcpip.Address, linkAddr t
// the link address if resolution completed successfully.
//
// Precondition: e.mu MUST be locked.
-func (e *neighborEntry) notifyCompletionLocked(succeeded bool) {
- res := LinkResolutionResult{LinkAddress: e.mu.neigh.LinkAddr, Success: succeeded}
+func (e *neighborEntry) notifyCompletionLocked(err tcpip.Error) {
+ res := LinkResolutionResult{LinkAddress: e.mu.neigh.LinkAddr, Err: err}
for _, callback := range e.mu.onResolve {
callback(res)
}
@@ -173,7 +173,7 @@ func (e *neighborEntry) notifyCompletionLocked(succeeded bool) {
// is resolved (which ends up obtaining the entry's lock) while holding the
// link resolution queue's lock. Dequeuing packets in a new goroutine avoids
// a lock ordering violation.
- go e.cache.nic.linkResQueue.dequeue(ch, e.mu.neigh.LinkAddr, succeeded)
+ go e.cache.nic.linkResQueue.dequeue(ch, e.mu.neigh.LinkAddr, err)
}
}
@@ -227,7 +227,13 @@ func (e *neighborEntry) removeLocked() {
e.mu.neigh.UpdatedAtNanos = e.cache.nic.stack.clock.NowNanoseconds()
e.dispatchRemoveEventLocked()
e.cancelTimerLocked()
- e.notifyCompletionLocked(false /* succeeded */)
+ // TODO(https://gvisor.dev/issues/5583): test the case where this function is
+ // called during resolution; that can happen in at least these scenarios:
+ //
+ // - manual address removal during resolution
+ //
+ // - neighbor cache eviction during resolution
+ e.notifyCompletionLocked(&tcpip.ErrAborted{})
}
// setStateLocked transitions the entry to the specified state immediately.
@@ -302,9 +308,8 @@ func (e *neighborEntry) setStateLocked(next NeighborState) {
e.mu.timer = timer{
done: &done,
timer: e.cache.nic.stack.Clock().AfterFunc(0, func() {
- var err tcpip.Error
- timedoutResolution := remaining == 0
- if !timedoutResolution {
+ var err tcpip.Error = &tcpip.ErrTimeout{}
+ if remaining != 0 {
err = e.cache.linkRes.LinkAddressRequest(addr, "" /* localAddr */, linkAddr)
}
@@ -316,8 +321,9 @@ func (e *neighborEntry) setStateLocked(next NeighborState) {
return
}
- if timedoutResolution || err != nil {
+ if err != nil {
e.setStateLocked(Unreachable)
+ e.notifyCompletionLocked(err)
e.dispatchChangeEventLocked()
return
}
@@ -328,7 +334,6 @@ func (e *neighborEntry) setStateLocked(next NeighborState) {
}
case Unreachable:
- e.notifyCompletionLocked(false /* succeeded */)
case Unknown, Stale, Static:
// Do nothing
@@ -374,9 +379,8 @@ func (e *neighborEntry) handlePacketQueuedLocked(localAddr tcpip.Address) {
e.mu.timer = timer{
done: &done,
timer: e.cache.nic.stack.Clock().AfterFunc(0, func() {
- var err tcpip.Error
- timedoutResolution := remaining == 0
- if !timedoutResolution {
+ var err tcpip.Error = &tcpip.ErrTimeout{}
+ if remaining != 0 {
// As per RFC 4861 section 7.2.2:
//
// If the source address of the packet prompting the solicitation is
@@ -395,8 +399,9 @@ func (e *neighborEntry) handlePacketQueuedLocked(localAddr tcpip.Address) {
return
}
- if timedoutResolution || err != nil {
+ if err != nil {
e.setStateLocked(Unreachable)
+ e.notifyCompletionLocked(err)
e.dispatchChangeEventLocked()
return
}
@@ -442,7 +447,7 @@ func (e *neighborEntry) handleProbeLocked(remoteLinkAddr tcpip.LinkAddress) {
// - RFC 4861 section 7.2.3
e.mu.neigh.LinkAddr = remoteLinkAddr
e.setStateLocked(Stale)
- e.notifyCompletionLocked(true /* succeeded */)
+ e.notifyCompletionLocked(nil)
e.dispatchChangeEventLocked()
case Reachable, Delay, Probe:
@@ -504,7 +509,7 @@ func (e *neighborEntry) handleConfirmationLocked(linkAddr tcpip.LinkAddress, fla
}
e.dispatchChangeEventLocked()
e.mu.isRouter = flags.IsRouter
- e.notifyCompletionLocked(true /* succeeded */)
+ e.notifyCompletionLocked(nil)
// "Note that the Override flag is ignored if the entry is in the
// INCOMPLETE state." - RFC 4861 section 7.2.5
@@ -539,7 +544,7 @@ func (e *neighborEntry) handleConfirmationLocked(linkAddr tcpip.LinkAddress, fla
wasReachable := e.mu.neigh.State == Reachable
// Set state to Reachable again to refresh timers.
e.setStateLocked(Reachable)
- e.notifyCompletionLocked(true /* succeeded */)
+ e.notifyCompletionLocked(nil)
if !wasReachable {
e.dispatchChangeEventLocked()
}
diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go
index f66db16a7..f9323d545 100644
--- a/pkg/tcpip/stack/nic.go
+++ b/pkg/tcpip/stack/nic.go
@@ -613,7 +613,7 @@ func (n *nic) getLinkAddress(addr, localAddr tcpip.Address, protocol tcpip.Netwo
}
if linkAddr, ok := linkRes.resolver.ResolveStaticAddress(addr); ok {
- onResolve(LinkResolutionResult{LinkAddress: linkAddr, Success: true})
+ onResolve(LinkResolutionResult{LinkAddress: linkAddr, Err: nil})
return nil
}
diff --git a/pkg/tcpip/stack/pending_packets.go b/pkg/tcpip/stack/pending_packets.go
index dc139ebb2..e936aa728 100644
--- a/pkg/tcpip/stack/pending_packets.go
+++ b/pkg/tcpip/stack/pending_packets.go
@@ -91,9 +91,9 @@ func (f *packetsPendingLinkResolution) init(nic *nic) {
// dequeue any pending packets associated with ch.
//
-// If success is true, packets will be written and sent to the given remote link
+// If err is nil, packets will be written and sent to the given remote link
// address.
-func (f *packetsPendingLinkResolution) dequeue(ch <-chan struct{}, linkAddr tcpip.LinkAddress, success bool) {
+func (f *packetsPendingLinkResolution) dequeue(ch <-chan struct{}, linkAddr tcpip.LinkAddress, err tcpip.Error) {
f.mu.Lock()
packets, ok := f.mu.packets[ch]
delete(f.mu.packets, ch)
@@ -110,7 +110,7 @@ func (f *packetsPendingLinkResolution) dequeue(ch <-chan struct{}, linkAddr tcpi
f.mu.Unlock()
if ok {
- f.dequeuePackets(packets, linkAddr, success)
+ f.dequeuePackets(packets, linkAddr, err)
}
}
@@ -176,7 +176,7 @@ func (f *packetsPendingLinkResolution) enqueue(r *Route, gso *GSO, proto tcpip.N
if len(cancelledPackets) != 0 {
// Dequeue the pending packets in a new goroutine to not hold up the current
// goroutine as handing link resolution failures may be a costly operation.
- go f.dequeuePackets(cancelledPackets, "" /* linkAddr */, false /* success */)
+ go f.dequeuePackets(cancelledPackets, "" /* linkAddr */, &tcpip.ErrAborted{})
}
return pkt.len(), nil
@@ -207,9 +207,9 @@ func (f *packetsPendingLinkResolution) newCancelChannelLocked(newCH <-chan struc
return packets
}
-func (f *packetsPendingLinkResolution) dequeuePackets(packets []pendingPacket, linkAddr tcpip.LinkAddress, success bool) {
+func (f *packetsPendingLinkResolution) dequeuePackets(packets []pendingPacket, linkAddr tcpip.LinkAddress, err tcpip.Error) {
for _, p := range packets {
- if success {
+ if err == nil {
p.routeInfo.RemoteLinkAddress = linkAddr
_, _ = f.nic.writePacketBuffer(p.routeInfo, p.gso, p.proto, p.pkt)
} else {
diff --git a/pkg/tcpip/stack/route.go b/pkg/tcpip/stack/route.go
index e946f9fe3..4ba6794a0 100644
--- a/pkg/tcpip/stack/route.go
+++ b/pkg/tcpip/stack/route.go
@@ -318,7 +318,7 @@ func (r *Route) ResolveWith(addr tcpip.LinkAddress) {
// ResolvedFieldsResult is the result of a route resolution attempt.
type ResolvedFieldsResult struct {
RouteInfo RouteInfo
- Success bool
+ Err tcpip.Error
}
// ResolvedFields attempts to resolve the remote link address if it is not
@@ -349,7 +349,7 @@ func (r *Route) resolvedFields(afterResolve func(ResolvedFieldsResult)) (RouteIn
r.mu.RUnlock()
if !resolutionRequired {
if afterResolve != nil {
- afterResolve(ResolvedFieldsResult{RouteInfo: fields, Success: true})
+ afterResolve(ResolvedFieldsResult{RouteInfo: fields, Err: nil})
}
return fields, nil, nil
}
@@ -364,11 +364,11 @@ func (r *Route) resolvedFields(afterResolve func(ResolvedFieldsResult)) (RouteIn
afterResolveFields := fields
linkAddr, ch, err := r.linkRes.getNeighborLinkAddress(r.nextHop(), linkAddressResolutionRequestLocalAddr, func(r LinkResolutionResult) {
if afterResolve != nil {
- if r.Success {
+ if r.Err == nil {
afterResolveFields.RemoteLinkAddress = r.LinkAddress
}
- afterResolve(ResolvedFieldsResult{RouteInfo: afterResolveFields, Success: r.Success})
+ afterResolve(ResolvedFieldsResult{RouteInfo: afterResolveFields, Err: r.Err})
}
})
if err == nil {
diff --git a/pkg/tcpip/stack/stack.go b/pkg/tcpip/stack/stack.go
index 674c9a1ff..de94ddfda 100644
--- a/pkg/tcpip/stack/stack.go
+++ b/pkg/tcpip/stack/stack.go
@@ -1542,7 +1542,7 @@ func (s *Stack) SetSpoofing(nicID tcpip.NICID, enable bool) tcpip.Error {
// LinkResolutionResult is the result of a link address resolution attempt.
type LinkResolutionResult struct {
LinkAddress tcpip.LinkAddress
- Success bool
+ Err tcpip.Error
}
// GetLinkAddress finds the link address corresponding to a network address.
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-14 03:15:04 +0000