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author | Ghanan Gowripalan <ghanan@google.com> | 2021-02-08 19:03:54 -0800 |
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committer | gVisor bot <gvisor-bot@google.com> | 2021-02-08 19:05:45 -0800 |
commit | 39251f31cb92d6c2b053416d04e195e290b106f2 (patch) | |
tree | bf3c80dc631655f48fc0b9686cfe2af2e6a4ab74 /pkg/sentry/fsimpl/devpts | |
parent | cfa4633c3d206aa2f9abdaac60d053162244ee6d (diff) |
Support performing DAD for any address
...as long as the network protocol supports duplicate address detection.
This CL provides the facilities for a netstack integrator to perform
DAD.
DHCP recommends that clients effectively perform DAD before accepting an
offer. As per RFC 2131 section 4.4.1 pg 38,
The client SHOULD perform a check on the suggested address to ensure
that the address is not already in use. For example, if the client
is on a network that supports ARP, the client may issue an ARP request
for the suggested request.
The implementation of ARP-based IPv4 DAD effectively operates the same
as IPv6's NDP DAD - using ARP requests and responses in place of
NDP neighbour solicitations and advertisements, respectively.
DAD performed by calls to (*Stack).CheckDuplicateAddress don't interfere
with DAD performed when a new IPv6 address is added. This is so that
integrator requests to check for duplicate addresses aren't unexpectedly
aborted when addresses are removed.
A network package internal package provides protocol agnostic DAD state
management that specific protocols that provide DAD can use.
Fixes #4550.
Tests:
- internal/ip_test.*
- integration_test.TestDAD
- arp_test.TestDADARPRequestPacket
- ipv6.TestCheckDuplicateAddress
PiperOrigin-RevId: 356405593
Diffstat (limited to 'pkg/sentry/fsimpl/devpts')
0 files changed, 0 insertions, 0 deletions