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[settings] Formalise notion of setting applicability

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Expose a function setting_applies() to allow a caller to determine
whether or not a particular setting is applicable to a particular
settings block.

Restrict DHCP-backed settings blocks to accepting only DHCP-based
settings.

Restrict network device settings blocks to accepting only DHCP-based
settings and network device-specific settings such as "mac".

Inspired-by: Glenn Brown <glenn@myri.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2011-03-22 16:56:35 +00:00
parent 9215b7f4c0
commit f5fd4dec3b
12 changed files with 235 additions and 17 deletions
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14
src/core/nvo.c
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@@ -184,6 +184,19 @@ static int nvo_save ( struct nvo_block *nvo ) {
return 0;
}
/**
* Check applicability of NVO setting
*
* @v settings Settings block
* @v setting Setting
* @ret applies Setting applies within this settings block
*/
static int nvo_applies ( struct settings *settings __unused,
struct setting *setting ) {
return dhcpopt_applies ( setting->tag );
}
/**
* Store value of NVO setting
*
@@ -236,6 +249,7 @@ static int nvo_fetch ( struct settings *settings, struct setting *setting,
/** NVO settings operations */
static struct settings_operations nvo_settings_operations = {
.applies = nvo_applies,
.store = nvo_store,
.fetch = nvo_fetch,
};