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2021-08-19Merge release-20210806.0-45-g3b4bb9475 (automated)gVisor bot
2021-08-19Add loopback interface as an ethernet-based deviceGhanan Gowripalan
...to match Linux behaviour. We can see evidence of Linux representing loopback as an ethernet-based device below: ``` # EUI-48 based MAC addresses. $ ip link show lo 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 # tcpdump showing ethernet frames when sniffing loopback and logging the # link-type as EN10MB (Ethernet). $ sudo tcpdump -i lo -e -c 2 -n tcpdump: verbose output suppressed, use -v[v]... for full protocol decode listening on lo, link-type EN10MB (Ethernet), snapshot length 262144 bytes 03:09:05.002034 00:00:00:00:00:00 > 00:00:00:00:00:00, ethertype IPv4 (0x0800), length 66: 127.0.0.1.9557 > 127.0.0.1.36828: Flags [.], ack 3562800815, win 15342, options [nop,nop,TS val 843174495 ecr 843159493], length 0 03:09:05.002094 00:00:00:00:00:00 > 00:00:00:00:00:00, ethertype IPv4 (0x0800), length 66: 127.0.0.1.36828 > 127.0.0.1.9557: Flags [.], ack 1, win 6160, options [nop,nop,TS val 843174496 ecr 843159493], length 0 2 packets captured 116 packets received by filter 0 packets dropped by kernel ``` Wireshark shows a similar result as the tcpdump example above. Linux's loopback setup: https://github.com/torvalds/linux/blob/5bfc75d92efd494db37f5c4c173d3639d4772966/drivers/net/loopback.c#L162 PiperOrigin-RevId: 391836719
2021-07-01Merge release-20210628.0-15-g07ffecef8 (automated)gVisor bot
2021-06-30Implement fmt.Stringer for NDPRoutePreferenceGhanan Gowripalan
PiperOrigin-RevId: 382427879
2021-06-30Merge release-20210628.0-13-g66a79461a (automated)gVisor bot
2021-06-29Support parsing NDP Route Information optionGhanan Gowripalan
This change prepares for a later change which supports the NDP Route Information option to discover more-specific routes, as per RFC 4191. Updates #6172. PiperOrigin-RevId: 382225812
2021-06-25Merge release-20210614.0-29-g1f113b96e (automated)gVisor bot
2021-06-24Incrementally update checksum when NAT-ingGhanan Gowripalan
...instead of calculating a fresh checksum to avoid re-calcalculating a checksum on unchanged bytes. Fixes #5340. PiperOrigin-RevId: 381403888
2021-06-21Merge release-20210614.0-7-g298cf3062 (automated)gVisor bot
2021-06-21Use fake clocks in NDP testsGhanan Gowripalan
Updates #5940. PiperOrigin-RevId: 380668609
2021-06-15Merge release-20210607.0-46-g3a8ba8ed9 (automated)gVisor bot
2021-06-14Support parsing Prf field in RAsGhanan Gowripalan
This change prepares for a later change which actually handles the Prf field in RAs to discover default routers with preference values, as per RFC 4191. Updates #6172. Test: header_test.TestNDPRouterAdvert PiperOrigin-RevId: 379421710
2021-05-28Merge release-20210518.0-62-g30bca3270 (automated)gVisor bot
2021-05-28Clean up warningsTamir Duberstein
- Typos - Unused arguments - Useless conversions PiperOrigin-RevId: 376362730
2021-05-26Merge release-20210518.0-49-g9fcc44f99 (automated)gVisor bot
2021-05-26Move presence methods from segment to TCPFlagsTamir Duberstein
PiperOrigin-RevId: 376001032
2021-05-25Merge release-20210518.0-38-g4f2439fb0 (automated)gVisor bot
2021-05-25Use opaque types to represent timeTamir Duberstein
Introduce tcpip.MonotonicTime; replace int64 in tcpip.Clock method returns with time.Time and MonotonicTime to improve type safety and ensure that monotonic clock readings are never compared to wall clock readings. PiperOrigin-RevId: 375775907
2021-05-22Merge release-20210518.0-25-g74b10e31a (automated)gVisor bot
2021-05-22Remove detritusTamir Duberstein
- Unused constants - Unused functions - Unused arguments - Unkeyed literals - Unnecessary conversions PiperOrigin-RevId: 375253464
2021-05-13Merge release-20210510.0-27-g84f04cc85 (automated)gVisor bot
2021-05-13Migrate PacketBuffer to use pkg/bufferTing-Yu Wang
Benchmark iperf3: Before After native->runsc 5.14 5.01 (Gbps) runsc->native 4.15 4.07 (Gbps) It did introduce overhead, mainly at the bridge between pkg/buffer and VectorisedView, the ExtractVV method. Once endpoints start migrating away from VV, this overhead will be gone. Updates #2404 PiperOrigin-RevId: 373651666
2021-04-20Merge release-20210412.0-36-g2c8379d95 (automated)gVisor bot
2021-04-20Expose header methods that validate checksumsArthur Sfez
This is done for IPv4, UDP and TCP headers. This also changes the packet checkers used in tests to error on zero-checksum, not sure why it was allowed before. And while I'm here, make comments' case consistent. RELNOTES: n/a Fixes #5049 PiperOrigin-RevId: 369383862
2021-04-15Use nicer formatting for IP addresses in testsKevin Krakauer
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
2021-04-09Merge release-20210408.0-12-g973ace6bd (automated)gVisor bot
2021-04-09Rename IsV6LinkLocalAddress to IsV6LinkLocalUnicastAddressGhanan Gowripalan
To match the V4 variant. PiperOrigin-RevId: 367691981
2021-04-08Merge release-20210322.0-61-g091badcb9 (automated)gVisor bot
2021-04-08Do not forward link-local packetsGhanan Gowripalan
As per RFC 3927 section 7 and RFC 4291 section 2.5.6. Test: forward_test.TestMulticastForwarding PiperOrigin-RevId: 367519336
2021-04-08Merge release-20210322.0-58-g9e4a1e31d (automated)gVisor bot
2021-04-08Join all routers group when forwarding is enabledGhanan Gowripalan
See comments inline code for rationale. Test: ip_test.TestJoinLeaveAllRoutersGroup PiperOrigin-RevId: 367449434
2021-04-06Merge release-20210322.0-53-gd7fd00bad (automated)gVisor bot
2021-04-06Do not perform MLD for certain multicast scopesGhanan Gowripalan
...as per RFC 2710 section 5 page 10. Test: ipv6_test.TestMLDSkipProtocol PiperOrigin-RevId: 367031126
2021-03-23Merge release-20210315.0-15-gacb4c6288 (automated)gVisor bot
2021-03-16Merge release-20210309.0-33-g05193de1c (automated)gVisor bot
2021-03-16Unexport methods on NDPOptionGhanan Gowripalan
They are not used outside of the header package. PiperOrigin-RevId: 363237708
2021-03-16Merge release-20210309.0-32-g68065d1ce (automated)gVisor bot
2021-03-16Detect looped-back NDP DAD messagesGhanan Gowripalan
...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
2021-03-10Merge release-20210301.0-31-g2a888a106 (automated)gVisor bot
2021-03-09Give TCP flags a dedicated typeZeling Feng
- Implement Stringer for it so that we can improve error messages. - Use TCPFlags through the code base. There used to be a mixed usage of byte, uint8 and int as TCP flags. PiperOrigin-RevId: 361940150
2021-03-04Merge release-20210301.0-12-g1cd76d958 (automated)gVisor bot
2021-03-03Make dedicated methods for data operations in PacketBufferTing-Yu Wang
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
2021-02-18Merge release-20210208.0-71-g2a2cb29e1 (automated)gVisor bot
2021-02-18Validate IGMP packetsArthur Sfez
This change also adds support for Router Alert option processing on incoming packets, a new stat for Router Alert option, and exports all the IP-option related stats. Fixes #5491 PiperOrigin-RevId: 358238123
2021-02-01Merge release-20210125.0-47-gebd3912c0 (automated)gVisor bot
2021-02-01Refactor HandleControlPacket/SockErrorGhanan Gowripalan
...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
2021-01-29Merge release-20210125.0-21-g8d1afb418 (automated)gVisor bot
2021-01-28Change tcpip.Error to an interfaceTamir Duberstein
This makes it possible to add data to types that implement tcpip.Error. ErrBadLinkEndpoint is removed as it is unused. PiperOrigin-RevId: 354437314
2021-01-20Merge release-20210112.0-48-g286516640 (automated)gVisor bot
2021-01-20Change the way the IP options report problemsJulian Elischer
The error messages are not needed or used as these are not processing errors so much as errors to be reported back to the packet sender. Implicitly describe whether each error should generate ICMP packets or not. Most do but there are a couple that do not. Slightly alter some test expectations for Linux compatibility and add a couple more. Improve Linux compatibility on error packet returns. Some cosmetic changes to tests to match the upcoming packet impact version of the same tests. PiperOrigin-RevId: 352889785
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