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Add config to skip DHCP boot to gnoi.FactoryReset. #204

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Add config to skip DHCP boot to gnoi.FactoryReset. #204

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1b3b706
Add config to skip DHCP boot to gnoi.FactoryReset.
daymare Jun 26, 2024
828c553
Merge branch 'openconfig:main' into FactoryReset
daymare Jul 2, 2024
b083fc5
Remove mention of Bootz from the ManagementConfig message.
daymare Jul 2, 2024
a38626e
Merge branch 'openconfig:main' into FactoryReset
daymare Sep 16, 2024
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19 changes: 18 additions & 1 deletion factory_reset/factory_reset.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,9 @@ service FactoryReset {
// Optionally allows for the Target to zero-fill permanent storage where state
// data is stored.
//
// Optionally allows for the Target to skip DHCP boot and populate with the
// provided management configuration.
//
// If any of the optional flags is set but not supported, a gRPC Status with
// code INVALID_ARGUMENT must be returned with the details value set to a
// properly populated ResetError message.
Expand All @@ -34,8 +37,20 @@ message StartRequest {
bool factory_os = 1;
// Instructs the Target to zero fill persistent storage state data.
bool zero_fill = 2;
// Instructs the Target to retain certificates
// Instructs the Target to retain certificates.
bool retain_certs = 3;
// Instructs the Target to populate with the provided Ip/Routing information
// and skip DHCP boot.
ManagementConfig mgmt_config = 4;
}

message ManagementConfig {
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Would it make more sense to use https://github.com/openconfig/bootz/blob/main/proto/bootz.proto#L225-L236 here? The idea being:

  • factory reset the config
  • apply the attached config. (which might include disabling dhcp and anything else you want to override)
  • reboot

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The problem is that this is not a traditional config.

This is a special config, that should be consumed at the start of the bootz process (which is typically invoked before any startup/running-config is involved) and by the bootz daemon only (it has no meaning to the other system components).

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The bootconfig message contains a parameter bootloader_config which is intended to contain items that are invoked/processed before any startup/running config is involved. If an implementation requires bootloader_config to contain some data to enable/disable the DHCP client used during bootz, that is fine. If the implementation uses OC config to do this, that is also fine.

If my comment is not on-track with your concerns, maybe you can share more details about the implementation so we can try and map it to bootz. Happy to do this offline with you if necessary and then we can follow up with some proposal here.

message BootConfig {
  // Proprietary key-value parameters that are required as part of boot
  // configuration (e.g., feature flags, or vendor-specific hardware knobs).
  google.protobuf.Struct metadata = 1;
  // Native format vendor configuration.
  bytes vendor_config = 2;
  // JSON rendered OC configuration.
  bytes oc_config = 3;
  // Bootloader key-value parameters that are required as part of boot
  // configuration.
  google.protobuf.Struct bootloader_config = 4;
}

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@LimeHat let me know what you think. Would like to keep this PR moving.

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If an implementation requires bootloader_config to contain some data to enable/disable the DHCP client used during bootz, that is fine. If the implementation uses OC config to do this, that is also fine.

There's a bit more to this proposal than a simple enablement/disablement of DHCP.
The core part of the bootz protocol is a DHCP response. It includes not only information about IP config, but also the bootstrap URL(s).

This proposal, in essence, is a way to substitute a real DHCP response with a pre-defined static message received via gNOI (pseudo-DHCP).

There are different ways to store this data. It can be stored in bootloader parameters (as you indicated, but this will be more than a flag), in can be stored in persistent memory (e.g. as a file or another implementation-dependent data structure). Probably it can't be stored as OpenConfig data (for instance, I don't think you can specify bootstrap URLs; and if the author wants to preserve compatibility with FactoryReset, it cannot be stored as a regular bootstrap cfg which is supposed to be erased during the reset). As a user, you probably don't to be concerned with implementation-specific details in order to use this.

I also don't want to couple this data with BootConfig message, for a number of reasons, including

  • in my opinion, these functions are logically independent, and,
  • overloading this structure will require the user to know and submit unneeded data to simply enable this pseudo-dhcp thing (e.g. the bytes vendor_config field will have to be present),
  • the whole SetBootConfigRequest RPC is designed to replace the data that was received from a bootstrap server, and that data only.

Personally, I still think that a new service is the best approach. If you'd prefer to extend the existing BootConfig service, I would suggest to create a new RPC for this feature, that seems like a reasonable middle ground.

Feel free to ping me in chat if you want to discuss further offline.

repeated string boot_server_uris = 1;
string device_ip = 2;
string mask_length = 3;
string gateway_ip = 4;
repeated string management_routes = 5;
repeated string dns_servers = 6;
}

message ResetSuccess {
Expand All @@ -47,6 +62,8 @@ message ResetError {
bool factory_os_unsupported = 1;
// Zero fill is not supported.
bool zero_fill_unsupported = 2;
// Management config is not supported.
bool mgmt_config_unsupported = 5;
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I know this has been flagged previously by Marcus, but I'll mention it again here in the interest of having the discussion more broadly. This field won't be a reliable indicator of what's going to happen.

Old devices that aren't aware of the mgmt_config field in the request also won't be aware of the mgmt_config_unsupported field in the response and therefore won't be able to set it to indicate their lack of awareness. Instead, they'll just silently ignore mgmt_config altogether. You won't be able to distinguish between an old device that ignored this part of your request and a new device that processed it like you requested.

Splitting the boot parameters from the FactoryReset service (like was proposed in another comment on the pull request) would make it easier to know what's going on. If you sent an old device something like SetBootstrapServerList in a BootParameters service, it would respond with an unimplemented error.

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I covered this in my comment above...
Again, I don't want to make a new service and clutter the namespace when this is fundamentally tied to FactoryReset. I think adding a new RPC to factory reset would be a better way to solve this problem.

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Bump the version of the service. Clients then have the option to ensure the service implements the new message.

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Bump the version of the service. Clients then have the option to ensure the service implements the new message.

gnoi package names don't include versions, hence it will not be visible

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I am not sure if we are talking about the same thing, but you should be able to query service options via file descriptors via reflection if the server implementes it. Its convoluted, but its there.

gnoi/types/types.proto

Line 26 in bae5fb4

extend google.protobuf.FileOptions {

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I see what you mean. Indeed, I was thinking about a different thing (traditional grpc versioning, where the version is part of the namespace/package name). Thx for clarifying.

// Unspecified error, must provide detail message.
bool other = 3;
string detail = 4;
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