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With this change, GSO options no longer needs to be passed around as
a function argument in the write path.
This change is done in preparation for a later change that defers
segmentation, and may change GSO options for a packet as it flows
down the stack.
Updates #170.
PiperOrigin-RevId: 369774872
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Before this change, packets were delivered asynchronously to the remote
end of a pipe. This was to avoid a deadlock during link resolution where
the stack would attempt to double-lock a mutex (see removed comments in
the parent commit for details).
As of https://github.com/google/gvisor/commit/4943347137, we do not hold
locks while sending link resolution probes so the deadlock will no
longer occur.
PiperOrigin-RevId: 356066224
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This makes it possible to add data to types that implement tcpip.Error.
ErrBadLinkEndpoint is removed as it is unused.
PiperOrigin-RevId: 354437314
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Test: integration_test.TestWritePacketsLinkResolution
Fixes #4458.
PiperOrigin-RevId: 353108826
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Test: integration_test.TestGetLinkAddress
PiperOrigin-RevId: 352119404
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stack.Route is used to send network packets and resolve link addresses.
A LinkEndpoint does not need to do either of these and only needs the
route's fields at the time of the packet write request.
Since LinkEndpoints only need the route's fields when writing packets,
pass a stack.RouteInfo instead.
PiperOrigin-RevId: 352108405
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Currently we rely on the user to take the lock on the endpoint that owns the
route, in order to modify it safely. We can instead move
`Route.RemoteLinkAddress` under `Route`'s mutex, and allow non-locking and
thread-safe access to other fields of `Route`.
PiperOrigin-RevId: 345461586
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Redefine stack.WritePacket into stack.WritePacketToRemote which lets the NIC
decide whether to append link headers.
PiperOrigin-RevId: 343071742
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Before this change, if a link header was included in an incoming packet
that is forwarded, the packet that gets sent out will take the original
packet and add a link header to it while keeping the old link header.
This would make the sent packet look like:
OUTGOING LINK HDR | INCOMING LINK HDR | NETWORK HDR | ...
Obviously this is incorrect as we should drop the incoming link header
and only include the outgoing link header. This change fixes this bug.
Test: integration_test.TestForwarding
PiperOrigin-RevId: 337571447
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PiperOrigin-RevId: 336339194
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PiperOrigin-RevId: 336304024
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When a response needs to be sent to an incoming packet, the stack should
consult its neighbour table to determine the remote address's link
address.
When an entry does not exist in the stack's neighbor table, the stack
should queue the packet while link resolution completes. See comments.
PiperOrigin-RevId: 336185457
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