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Fixes #2926, #674
PiperOrigin-RevId: 369457123
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This change replaces individual private members in tcp.endpoint with a single
private TCPEndpointState member.
Some internal substructures within endpoint (receiver, sender) have been broken
into a public substructure (which is then copied into the TCPEndpointState
returned from completeState()) alongside other private fields.
Fixes #4466
PiperOrigin-RevId: 369329514
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This fixes a race that occurs while the endpoint is being unregistered
and the transport demuxer attempts to match the incoming packet to any
endpoint. The race specifically occurs when the unregistration (and
deletion of the endpoint) occurs, after a successful endpointsByNIC
lookup and before the endpoints map is further looked up with ingress
NICID of the packet.
The fix is to notify the caller of lookup-with-NICID failure, so that
the logic falls through to handling unknown destination packets.
For TCP this can mean replying back with RST.
The syscall test in this CL catches this race as the ACK completing the
handshake could get silently dropped on a listener close, causing no
RST sent to the peer and timing out the poll waiting for POLLHUP.
Fixes #5850
PiperOrigin-RevId: 369023779
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This was semi-automated -- there are many addresses that were not replaced.
Future commits should clean those up.
Parse4 and Parse6 were given their own package because //pkg/test can introduce
dependency cycles, as it depends transitively on //pkg/tcpip and some other
netstack packages.
PiperOrigin-RevId: 368726528
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The current SNAT implementation has several limitations:
- SNAT source port has to be specified. It is not optional.
- SNAT source port range is not supported.
- SNAT for UDP is a one-way translation. No response packets
are handled (because conntrack doesn't support UDP currently).
- SNAT and REDIRECT can't work on the same connection.
Fixes #5489
PiperOrigin-RevId: 367750325
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To match the V4 variant.
PiperOrigin-RevId: 367691981
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See comments inline code for rationale.
Test: ip_test.TestJoinLeaveAllRoutersGroup
PiperOrigin-RevId: 367449434
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On Linux these are meant to be equivalent to POLLIN/POLLOUT. Rather
than hack these on in sys_poll etc it felt cleaner to just cleanup
the call sites to notify for both events. This is what linux does
as well.
Fixes #5544
PiperOrigin-RevId: 364859977
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This change sets the inner `routeInfo` struct to be a named private member
and replaces direct access with access through getters. Note that direct
access to the fields of `routeInfo` is still possible through the `RouteInfo`
struct.
Fixes #4902
PiperOrigin-RevId: 364822872
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PiperOrigin-RevId: 364381970
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Transport demuxer and UDP tests should not use a loopback address as the
source address for packets injected into the stack as martian loopback
packets will be dropped in a later change.
PiperOrigin-RevId: 363479681
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...as per RFC 7527.
If a looped-back DAD message is received, do not fail DAD since our own
DAD message does not indicate that a neighbor has the address assigned.
Test: ndp_test.TestDADResolveLoopback
PiperOrigin-RevId: 363224288
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Calling into the stack from LinkAddressRequest is not needed as we
already have a reference to the network endpoint (IPv6) or network
interface (IPv4/ARP).
PiperOrigin-RevId: 363213973
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Lots of small changes:
- simplify package API via Reservation type
- rename some single-letter variable names that were hard to follow
- rename some types
PiperOrigin-RevId: 362442366
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Speeds up the socket stress tests by a couple orders of magnitude.
PiperOrigin-RevId: 361721050
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The integrator may be interested in who owns a duplicate address so
pass this information (if available) along.
Fixes #5605.
PiperOrigin-RevId: 361213556
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While I'm here, update NDPDispatcher.OnDuplicateAddressDetectionStatus to
take a DADResult and rename it to OnDuplicateAddressDetectionResult.
Fixes #5606.
PiperOrigin-RevId: 360965416
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One of the preparation to decouple underlying buffer implementation.
There are still some methods that tie to VectorisedView, and they will be
changed gradually in later CLs.
This CL also introduce a new ICMPv6ChecksumParams to replace long list of
parameters when calling ICMPv6Checksum, aiming to be more descriptive.
PiperOrigin-RevId: 360778149
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Changes the neighbor_cache_test.go tests to always assert UpdatedAtNanos.
Completes the assertion of UpdatedAtNanos in every NUD test, a field that was
historically not checked due to the lack of a deterministic, controllable
clock. This is no longer true with the tcpip.Clock interface. While the tests
have been adjusted to use Clock, asserting by the UpdatedAtNanos was neglected.
Fixes #4663
PiperOrigin-RevId: 360730077
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Prevent the situation where callers to (*stack).GetLinkAddress provide
incorrect arguments and are unable to observe this condition.
Updates #5583.
PiperOrigin-RevId: 360481557
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Changes the neighbor_entry_test.go tests to always assert UpdatedAtNanos.
This field was historically not checked due to the lack of a deterministic,
controllable clock. This is no longer true with the tcpip.Clock interface.
While the tests have been adjusted to use Clock, asserting by the
UpdatedAtNanos was neglected.
Subsequent work is needed to assert UpdatedAtNanos in the neighbor cache tests.
Updates #4663
PiperOrigin-RevId: 359868254
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Converts entryTestLinkResolver and testNUDDispatcher to use the embedded
sync.Mutex pattern for fields that may be accessed concurrently from different
gorountines.
Fixes #5541
PiperOrigin-RevId: 359826169
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Adds helper functions for transitioning into common states. This reduces the
boilerplate by a fair amount, decreasing the barriers to entry for new features
added to neighborEntry.
PiperOrigin-RevId: 359810465
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Also increase refcount of raw.endpoint.route while in use.
Avoid allocating an array of size zero.
PiperOrigin-RevId: 359797788
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Prevents the following deadlock:
- Raw packet is sent via e.Write(), which read locks e.mu
- Connect() is called, blocking on write locking e.mu
- The packet is routed to loopback and back to e.HandlePacket(), which read
locks e.mu
Per the atomic.RWMutex documentation, this deadlocks:
"If a goroutine holds a RWMutex for reading and another goroutine might call
Lock, no goroutine should expect to be able to acquire a read lock until the
initial read lock is released. In particular, this prohibits recursive read
locking. This is to ensure that the lock eventually becomes available; a blocked
Lock call excludes new readers from acquiring the lock."
Also, release eps.mu earlier in deliverRawPacket.
PiperOrigin-RevId: 359600926
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Previously, when DAD would detect a conflict for a temporary address,
the address would be removed but its timers would not be stopped,
resulting in a panic when the removed address's invalidation timer
fired.
While I'm here, remove the check for unicast-ness on removed address
endpoints since multicast addresses are no longer stored in the same
structure as unicast addresses as of 27ee4fe76ad586ac8751951a842b3681f93.
Test: stack_test.TestMixedSLAACAddrConflictRegen
PiperOrigin-RevId: 359344849
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Completes the soft migration to Unreachable state by removing the Failed state
and the the FailedEntryLookups StatCounter.
Fixes #4667
PiperOrigin-RevId: 358226380
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PiperOrigin-RevId: 358078157
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... as per RFC 7048. The Failed state is an internal state that is not
specified by any RFC; replacing it with the Unreachable state enables us to
expose this state while keeping our terminology consistent with RFC 4861 and
RFC 7048.
Unreachable state replaces all internal references for Failed state. However
unlike the Failed state, change events are dispatched when moving into
Unreachable state. This gives developers insight into whether a neighbor entry
failed address resolution or whether it was explicitly removed.
The Failed state will be removed entirely once all references to it are
removed. This is done to avoid a Fuchsia roll failure.
Updates #4667
PiperOrigin-RevId: 356554104
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The thing the lock protects will never be accessed concurrently.
PiperOrigin-RevId: 356423331
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...as long as the network protocol supports duplicate address detection.
This CL provides the facilities for a netstack integrator to perform
DAD.
DHCP recommends that clients effectively perform DAD before accepting an
offer. As per RFC 2131 section 4.4.1 pg 38,
The client SHOULD perform a check on the suggested address to ensure
that the address is not already in use. For example, if the client
is on a network that supports ARP, the client may issue an ARP request
for the suggested request.
The implementation of ARP-based IPv4 DAD effectively operates the same
as IPv6's NDP DAD - using ARP requests and responses in place of
NDP neighbour solicitations and advertisements, respectively.
DAD performed by calls to (*Stack).CheckDuplicateAddress don't interfere
with DAD performed when a new IPv6 address is added. This is so that
integrator requests to check for duplicate addresses aren't unexpectedly
aborted when addresses are removed.
A network package internal package provides protocol agnostic DAD state
management that specific protocols that provide DAD can use.
Fixes #4550.
Tests:
- internal/ip_test.*
- integration_test.TestDAD
- arp_test.TestDADARPRequestPacket
- ipv6.TestCheckDuplicateAddress
PiperOrigin-RevId: 356405593
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It was replaced by NUD/neighborCache.
Fixes #4658.
PiperOrigin-RevId: 356085221
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The network endpoints only look for other network endpoints of the
same kind. Since the network protocols keeps track of all endpoints,
go through the protocol to find an endpoint with an address instead
of the stack.
PiperOrigin-RevId: 356051498
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Previously when sending probe messages, we would hold a shared lock
which lead to deadlocks (due to synchronous packet loooping (e.g. pipe
and loopback link endpoints)) and lock contention.
Writing packets may be an expensive operation which could prevent other
goroutines from doing meaningful work if a shared lock is held while
writing packets.
This change upates the NUD timers to not hold shared locks while
sending packets.
PiperOrigin-RevId: 356048697
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Also while I'm here, update neighbor cahce/entry tests to use the
stack's RNG instead of creating a neigbor cache/entry specific one.
PiperOrigin-RevId: 356040581
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The NIC structure is not to be used outside of the stack package
directly.
PiperOrigin-RevId: 356036737
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Network endpoints that wish to check addresses on another NIC-local
network endpoint may now do so through the NetworkInterface.
This fixes a lock ordering issue between NIC removal and link
resolution. Before this change:
NIC Removal takes the stack lock, neighbor cache lock then neighbor
entries' locks.
When performing IPv4 link resolution, we take the entry lock then ARP
would try check IPv4 local addresses through the stack which tries to
obtain the stack's lock.
Now that ARP can check IPv4 addreses through the NIC, we avoid the lock
ordering issue, while also removing the need for stack to lookup the
NIC.
PiperOrigin-RevId: 356034245
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Make it clear that failing to parse a looped back is not a packet
sending error but a malformed received packet error.
FindNetworkEndpoint returns nil when no network endpoint is found
instead of an error.
PiperOrigin-RevId: 355954946
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PiperOrigin-RevId: 355751801
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Netstack today will send dupACK's with no rate limit for incoming out of
window segments. This can result in ACK loops for example if a TCP socket
connects to itself (actually permitted by TCP). Where the ACK sent in
response to packets being out of order itself gets considered as an out
of window segment resulting in another ACK being generated.
PiperOrigin-RevId: 355206877
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...to remove the need for the transport layer to deduce the type of
error it received.
Rename HandleControlPacket to HandleError as HandleControlPacket only
handles errors.
tcpip.SockError now holds a tcpip.SockErrorCause interface that
different errors can implement.
PiperOrigin-RevId: 354994306
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This change flips gvisor to use Neighbor unreachability detection by
default to populate the neighbor table as defined by RFC 4861 section 7.
Although RFC 4861 is targeted at IPv6, the same algorithm is used for
link resolution on IPv4 networks using ARP.
Integrators may still use the legacy link address cache by setting
stack.Options.UseLinkAddrCache to true; stack.Options.UseNeighborCache
is now unused and will be removed.
A later change will remove linkAddrCache and associated code.
Updates #4658.
PiperOrigin-RevId: 354850531
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This stores each protocol's neighbor state separately.
This change also removes the need for each neighbor entry to keep
track of their own link address resolver now that all the entries
in a cache will use the same resolver.
PiperOrigin-RevId: 354818155
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The network endpoint should not need to have logic to handle different
kinds of neighbor tables. Network endpoints can let the NIC know about
differnt neighbor discovery messages and let the NIC decide which table
to update.
This allows us to remove the LinkAddressCache interface.
PiperOrigin-RevId: 354812584
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PiperOrigin-RevId: 354746864
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This removes the need to provide the link address request with the NIC
the request is being performed on since the NetworkEndpoints already
have a reference to the NIC.
PiperOrigin-RevId: 354721940
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This allows later decoupling of the backing network buffer implementation.
PiperOrigin-RevId: 354643297
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When a route does not need to resolve a remote link address to send a
packet, avoid having to obtain the pending packets queue's lock.
PiperOrigin-RevId: 354456280
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After receiving an ACK(cumulative or selective), RACK will update the reorder
window which is used as a settling time before marking the packet as lost.
This change will add an init function to initialize the variables in RACK and
also store the reference to sender in rackControl.
The reorder window is calculated as per rfc:
https://tools.ietf.org/html/draft-ietf-tcpm-rack-08#section-7.2 Step 4.
PiperOrigin-RevId: 354453528
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Avoid a race condition in which an entry is acquired while it is being
evicted by overlapping the entry lock with the cache lock.
PiperOrigin-RevId: 354452639
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