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This change marks the socket as ESTABLISHED and creates the receiver and sender
the moment we send the final ACK in case of an active TCP handshake or when we
receive the final ACK for a passive TCP handshake. Before this change there was
a short window in which an ACK can be received and processed but the state on
the socket is not yet ESTABLISHED.
This can be seen in TestConnectBindToDevice which is flaky because sometimes
the socket is in SYN-SENT and not ESTABLISHED even though the other side has
already received the final ACK of the handshake.
PiperOrigin-RevId: 284277713
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This change allows the netstack to do SLAAC as outlined by RFC 4862 section 5.5.
Note, this change will not break existing uses of netstack as the default
configuration for the stack options is set in such a way that SLAAC
will not be performed. See `stack.Options` and `stack.NDPConfigurations` for
more details.
This change reuses 1 option and introduces a new one that is required to take
advantage of SLAAC, all available under NDPConfigurations:
- HandleRAs: Whether or not NDP RAs are processes
- AutoGenGlobalAddresses: Whether or not SLAAC is performed.
Also note, this change does not deprecate SLAAC generated addresses after the
preferred lifetime. That will come in a later change (b/143713887). Currently,
only the valid lifetime is honoured.
Tests: Unittest to make sure that SLAAC generates and adds addresses only when
configured to do so. Tests also makes sure that conflicts with static addresses
do not modify the static address.
PiperOrigin-RevId: 284265317
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This change adds a type to represent the NDP Recursive DNS Server option, as
defined by RFC 8106 section 5.1.
PiperOrigin-RevId: 284005493
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If the socket is bound to ANY and connected to a loopback address,
getsockname() has to return the loopback address. Without this fix,
getsockname() returns ANY.
PiperOrigin-RevId: 283647781
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The code in rcv.consumeSegment incorrectly transitions to
CLOSED state from LAST-ACK before the final ACK for the FIN.
Further if receiving a segment changes a socket to a closed state
then we should not invoke the sender as the socket is now closed
and sending any segments is incorrect.
PiperOrigin-RevId: 283625300
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This change does not introduce any new features, or modify existing ones.
This change tests handling TCP segments right away for connections that were
completed from a listening endpoint.
PiperOrigin-RevId: 282986457
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This involves allowing getsockopt/setsockopt for the corresponding socket
options, as well as allowing hostinet to process control messages received from
the actual recvmsg syscall.
PiperOrigin-RevId: 282851425
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These are necessary for iptables to read and parse headers for packet filtering.
PiperOrigin-RevId: 282372811
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Packets written via SOCK_RAW are guaranteed to have network headers, but not
transport headers. Check first whether there are enough bytes left in the packet
to contain a transport header before attempting to parse it.
PiperOrigin-RevId: 282363895
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PiperOrigin-RevId: 282194656
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PiperOrigin-RevId: 282068093
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This allows us to ensure that the correct port reservation is released.
Fixes #1217
PiperOrigin-RevId: 282048155
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PiperOrigin-RevId: 282045221
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PiperOrigin-RevId: 282023891
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PiperOrigin-RevId: 280763655
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As we move to CLOSE state from LAST-ACK or TIME-WAIT,
ensure that we re-match all in-flight segments to any
listening endpoint.
Also fix LISTEN state handling of any ACK segments as per RFC793.
Fixes #1153
PiperOrigin-RevId: 280703556
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Sniffer assumed that outgoing packets have transport headers, but
users can write packets via SOCK_RAW with arbitrary transport headers that
netstack doesn't know about. We now explicitly check for the presence of network
and transport headers before assuming they exist.
PiperOrigin-RevId: 280594395
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PiperOrigin-RevId: 280455453
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PiperOrigin-RevId: 280280156
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This change drops TCP packets with a non-unicast IP address as the source or
destination address as TCP is meant for communication between two endpoints.
Test: Make sure that if the source or destination address contains a non-unicast
address, no TCP packet is sent in response and the packet is dropped.
PiperOrigin-RevId: 280073731
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This change allows the netstack to do NDP's Prefix Discovery as outlined by
RFC 4861 section 6.3.4. If configured to do so, when a new on-link prefix is
discovered, the routing table will be updated with a device route through
the nic the RA arrived at. Likewise, when such a prefix gets invalidated, the
device route will be removed.
Note, this change will not break existing uses of netstack as the default
configuration for the stack options is set in such a way that Prefix Discovery
will not be performed. See `stack.Options` and `stack.NDPConfigurations` for
more details.
This change reuses 1 option and introduces a new one that is required to take
advantage of Prefix Discovery, all available under NDPConfigurations:
- HandleRAs: Whether or not NDP RAs are processes
- DiscoverOnLinkPrefixes: Whether or not Prefix Discovery is performed (new)
Another note: for a NIC to process Prefix Information options (in Router
Advertisements), it must not be a router itself. Currently the netstack does not
have per-interface routing configuration; the routing/forwarding configuration
is controlled stack-wide. Therefore, if the stack is configured to enable
forwarding/routing, no router Advertisements (and by extension the Prefix
Information options) will be processed.
Tests: Unittest to make sure that Prefix Discovery and updates to the routing
table only occur if explicitly configured to do so. Unittest to make sure at
max stack.MaxDiscoveredOnLinkPrefixes discovered on-link prefixes are
remembered.
PiperOrigin-RevId: 280049278
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* Basic tests for the SO_REUSEADDR and SO_REUSEPORT options.
* SO_REUSEADDR functional tests for TCP and UDP.
* SO_REUSEADDR and SO_REUSEPORT interaction tests for UDP.
* Stubbed support for UDP getsockopt(SO_REUSEADDR).
PiperOrigin-RevId: 280049265
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PiperOrigin-RevId: 279814493
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This change adds explicit support for honoring the 2MSL timeout
for sockets in TIME_WAIT state. It also adds support for the
TCP_LINGER2 option that allows modification of the FIN_WAIT2
state timeout duration for a given socket.
It also adds an option to modify the Stack wide TIME_WAIT timeout
but this is only for testing. On Linux this is fixed at 60s.
Further, we also now correctly process RST's in CLOSE_WAIT and
close the socket similar to linux without moving it to error
state.
We also now handle SYN in ESTABLISHED state as per
RFC5961#section-4.1. Earlier we would just drop these SYNs.
Which can result in some tests that pass on linux to fail on
gVisor.
Netstack now honors TIME_WAIT correctly as well as handles the
following cases correctly.
- TCP RSTs in TIME_WAIT are ignored.
- A duplicate TCP FIN during TIME_WAIT extends the TIME_WAIT
and a dup ACK is sent in response to the FIN as the dup FIN
indicates potential loss of the original final ACK.
- An out of order segment during TIME_WAIT generates a dup ACK.
- A new SYN w/ a sequence number > the highest sequence number
in the previous connection closes the TIME_WAIT early and
opens a new connection.
Further to make the SYN case work correctly the ISN (Initial
Sequence Number) generation for Netstack has been updated to
be as per RFC. Its not a pure random number anymore and follows
the recommendation in https://tools.ietf.org/html/rfc6528#page-3.
The current hash used is not a cryptographically secure hash
function. A separate change will update the hash function used
to Siphash similar to what is used in Linux.
PiperOrigin-RevId: 279106406
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https://github.com/golang/go/wiki/CodeReviewComments#initialisms
This change does not introduce any new functionality. It just renames variables
from `nicid` to `nicID`.
PiperOrigin-RevId: 278992966
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PiperOrigin-RevId: 278979065
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