Move IP state from NIC to NetworkEndpoint/Protocol

* 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

1 files changed, 0 insertions, 40 deletions

diff --git a/pkg/tcpip/stack/dhcpv6configurationfromndpra_string.go b/pkg/tcpip/stack/dhcpv6configurationfromndpra_string.go
deleted file mode 100644
index d199ded6a..000000000
--- a/pkg/tcpip/stack/dhcpv6configurationfromndpra_string.go
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2020 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// Code generated by "stringer -type DHCPv6ConfigurationFromNDPRA"; DO NOT EDIT.
-
-package stack
-
-import "strconv"
-
-func _() {
-	// An "invalid array index" compiler error signifies that the constant values have changed.
-	// Re-run the stringer command to generate them again.
-	var x [1]struct{}
-	_ = x[DHCPv6NoConfiguration-1]
-	_ = x[DHCPv6ManagedAddress-2]
-	_ = x[DHCPv6OtherConfigurations-3]
-}
-
-const _DHCPv6ConfigurationFromNDPRA_name = "DHCPv6NoConfigurationDHCPv6ManagedAddressDHCPv6OtherConfigurations"
-
-var _DHCPv6ConfigurationFromNDPRA_index = [...]uint8{0, 21, 41, 66}
-
-func (i DHCPv6ConfigurationFromNDPRA) String() string {
-	i -= 1
-	if i < 0 || i >= DHCPv6ConfigurationFromNDPRA(len(_DHCPv6ConfigurationFromNDPRA_index)-1) {
-		return "DHCPv6ConfigurationFromNDPRA(" + strconv.FormatInt(int64(i+1), 10) + ")"
-	}
-	return _DHCPv6ConfigurationFromNDPRA_name[_DHCPv6ConfigurationFromNDPRA_index[i]:_DHCPv6ConfigurationFromNDPRA_index[i+1]]
-}