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2020-10-09Merge release-20200928.0-78-g743327817 (automated)gVisor bot
2020-10-09Merge release-20200928.0-77-g257703c05 (automated)gVisor bot
2020-10-09Automated rollback of changelist 336304024Ghanan Gowripalan
PiperOrigin-RevId: 336339194
2020-10-09Merge release-20200928.0-74-g8566decab (automated)gVisor bot
2020-10-09Automated rollback of changelist 336185457Bhasker Hariharan
PiperOrigin-RevId: 336304024
2020-10-09Merge release-20200928.0-73-g07b1d7413 (automated)gVisor bot
2020-10-08Only block resolution when NUD is incompleteGhanan Gowripalan
When a completed entry exists for a neighbor, there is no need to block while reachability is (re)confirmed. The stack should continue to use the neighbor's link address while NUD is performed. Test: stack_test.TestNeighborCacheReplace PiperOrigin-RevId: 336199043
2020-10-08Merge release-20200928.0-71-g6768e6c59 (automated)gVisor bot
2020-10-08Do not resolve routes immediatelyGhanan Gowripalan
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
2020-10-08Merge release-20200928.0-66-ga55bd73d4 (automated)gVisor bot
2020-10-05Merge release-20200928.0-39-g91e2d15a6 (automated)gVisor bot
2020-10-05Remove AssignableAddressEndpoint.NetworkEndpointGhanan Gowripalan
We can get the network endpoint directly from the NIC. This is a preparatory CL for when a Route needs to hold a dedicated NIC as its output interface. This is because when forwarding is enabled, packets may be sent from a NIC different from the NIC a route's local address is associated with. PiperOrigin-RevId: 335484500
2020-09-30Merge release-20200921.0-93-g6f8d64f42 (automated)gVisor bot
2020-09-30ip6tables: redirect supportKevin Krakauer
Adds support for the IPv6-compatible redirect target. Redirection is a limited form of DNAT, where the destination is always the localhost. Updates #3549. PiperOrigin-RevId: 334698344
2020-09-30Merge release-20200921.0-92-g7f9e13053 (automated)gVisor bot
2020-09-30Count IP OutgoingPacketErrors in the NetworkEndpoint methodsArthur Sfez
Before this change, OutgoingPacketErrors was incremented in the stack.Route methods. This was going to be a problem once IPv4/IPv6 WritePackets support fragmentation because Route.WritePackets might now know how many packets are left after an error occurs. Test: - pkg/tcpip/network/ipv4:ipv4_test - pkg/tcpip/network/ipv6:ipv6_test PiperOrigin-RevId: 334687983
2020-09-30Merge release-20200921.0-82-g694d6ae32 (automated)gVisor bot
2020-09-30Use the ICMP error response facilityJulian Elischer
Add code in IPv6 to send ICMP packets while processing extension headers. Add some accounting in processing IPV6 Extension headers which allows us to report meaningful information back in ICMP parameter problem packets. IPv4 also needs to send a message when an unsupported protocol is requested. Add some tests to generate both ipv4 and ipv6 packets with various errors and check the responses. Add some new checkers and cleanup some inconsistencies in the messages in that file. Add new error types for the ICMPv4/6 generators. Fix a bug in the ICMPv4 generator that stopped it from generating "Unknown protocol" messages. Updates #2211 PiperOrigin-RevId: 334661716
2020-09-30Merge release-20200921.0-80-gb49a17fc3 (automated)gVisor bot
2020-09-30Make all Target.Action implementation pointer receiversKevin Krakauer
PiperOrigin-RevId: 334652998
2020-09-30Merge release-20200921.0-77-g0aae51c6e (automated)gVisor bot
2020-09-29iptables: remove unused min/max NAT range fieldsKevin Krakauer
PiperOrigin-RevId: 334531794
2020-09-30Merge release-20200921.0-76-ge5ece9aea (automated)gVisor bot
2020-09-29Return permanent addresses when NIC is downGhanan Gowripalan
Test: stack_test.TestGetMainNICAddressWhenNICDisabled PiperOrigin-RevId: 334513286
2020-09-29Merge release-20200921.0-72-g6ae83404a (automated)gVisor bot
2020-09-29Don't allow broadcast/multicast source addressGhanan Gowripalan
As per relevant IP RFCS (see code comments), broadcast (for IPv4) and multicast addresses are not allowed. Currently checks for these are done at the transport layer, but since it is explicitly forbidden at the IP layers, check for them there. This change also removes the UDP.InvalidSourceAddress stat since there is no longer a need for it. Test: ip_test.TestSourceAddressValidation PiperOrigin-RevId: 334490971
2020-09-29Merge release-20200921.0-70-g7fbb45e8e (automated)gVisor bot
2020-09-29iptables: refactor to make targets extendableKevin Krakauer
Like matchers, targets should use a module-like register/lookup system. This replaces the brittle switch statements we had before. The only behavior change is supporing IPT_GET_REVISION_TARGET. This makes it much easier to add IPv6 redirect in the next change. Updates #3549. PiperOrigin-RevId: 334469418
2020-09-29Merge release-20200921.0-61-g5075d0342 (automated)gVisor bot
2020-09-29Trim Network/Transport Endpoint/ProtocolGhanan Gowripalan
* Remove Capabilities and NICID methods from NetworkEndpoint. * Remove linkEP and stack parameters from NetworkProtocol.NewEndpoint. The LinkEndpoint can be fetched from the NetworkInterface. The stack is passed to the NetworkProtocol when it is created so the NetworkEndpoint can get it from its protocol. * Remove stack parameter from TransportProtocol.NewEndpoint. Like the NetworkProtocol/Endpoint, the stack is passed to the TransportProtocol when it is created. PiperOrigin-RevId: 334332721
2020-09-29Merge release-20200921.0-60-g48915bded (automated)gVisor bot
2020-09-29Move IP state from NIC to NetworkEndpoint/ProtocolGhanan Gowripalan
* Add network address to network endpoints. Hold network-specific state in the NetworkEndpoint instead of the stack. This results in the stack no longer needing to "know" about the network endpoints and special case certain work for various endpoints (e.g. IPv6 DAD). * Provide NetworkEndpoints with an NetworkInterface interface. Instead of just passing the NIC ID of a NIC, pass an interface so the network endpoint may query other information about the NIC such as whether or not it is a loopback device. * Move NDP code and state to the IPv6 package. NDP is IPv6 specific so there is no need for it to live in the stack. * Control forwarding through NetworkProtocols instead of Stack Forwarding should be controlled on a per-network protocol basis so forwarding configurations are now controlled through network protocols. * Remove stack.referencedNetworkEndpoint. Now that addresses are exposed via AddressEndpoint and only one NetworkEndpoint is created per interface, there is no need for a referenced NetworkEndpoint. * Assume network teardown methods are infallible. Fixes #3871, #3916 PiperOrigin-RevId: 334319433
2020-09-28Merge release-20200921.0-56-ga5acc0616 (automated)gVisor bot
2020-09-28Support creating protocol instances with Stack refGhanan Gowripalan
Network or transport protocols may want to reach the stack. Support this by letting the stack create the protocol instances so it can pass a reference to itself at protocol creation time. Note, protocols do not yet use the stack in this CL but later CLs will make use of the stack from protocols. PiperOrigin-RevId: 334260210
2020-09-27Merge release-20200921.0-52-ga376a0baf (automated)gVisor bot
2020-09-26Remove generic ICMP errorsGhanan Gowripalan
Generic ICMP errors were required because the transport dispatcher was given the responsibility of sending ICMP errors in response to transport packet delivery failures. Instead, the transport dispatcher should let network layer know it failed to deliver a packet (and why) and let the network layer make the decision as to what error to send (if any). Fixes #4068 PiperOrigin-RevId: 333962333
2020-09-24Merge release-20200914.0-151-g5d50c91c4 (automated)gVisor bot
2020-09-24Change segment/pending queue to use receive buffer limits.Bhasker Hariharan
segment_queue today has its own standalone limit of MaxUnprocessedSegments but this can be a problem in UnlockUser() we do not release the lock till there are segments to be processed. What can happen is as handleSegments dequeues packets more keep getting queued and we will never release the lock. This can keep happening even if the receive buffer is full because nothing can read() till we release the lock. Further having a separate limit for pending segments makes it harder to track memory usage etc. Unifying the limits makes it easier to reason about memory in use and makes the overall buffer behaviour more consistent. PiperOrigin-RevId: 333508122
2020-09-24Merge release-20200914.0-141-ge02e7e999 (automated)gVisor bot
2020-09-23Remove unused field from neighborEntryGhanan Gowripalan
PiperOrigin-RevId: 333405169
2020-09-23Merge release-20200914.0-137-g99decaadd (automated)gVisor bot
2020-09-23Extract ICMP error sender from UDPJulian Elischer
Store transport protocol number on packet buffers for use in ICMP error generation. Updates #2211. PiperOrigin-RevId: 333252762
2020-09-22Move stack.fakeClock into a separate packageToshi Kikuchi
PiperOrigin-RevId: 333138701
2020-09-21Merge release-20200907.0-157-gca3087472 (automated)gVisor bot
2020-09-20Merge pull request #3651 from ianlewis:ip-forwardinggVisor bot
PiperOrigin-RevId: 332760843
2020-09-18Merge release-20200907.0-145-gbd69afdcd (automated)gVisor bot
2020-09-18Count packets dropped by iptables in IPStatsKevin Krakauer
PiperOrigin-RevId: 332486383
2020-09-18Merge release-20200907.0-135-g0b8d306e6 (automated)gVisor bot
2020-09-17ip6tables: filter table supportKevin Krakauer
`ip6tables -t filter` is now usable. NAT support will come in a future CL. #3549 PiperOrigin-RevId: 332381801
2020-09-16Merge release-20200907.0-66-g29ce0ad16 (automated)gVisor bot
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