diff options
Diffstat (limited to 'src/net/udp/dhcp.c')
| -rw-r--r-- | src/net/udp/dhcp.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/src/net/udp/dhcp.c b/src/net/udp/dhcp.c index aba90002..0edd0ad8 100644 --- a/src/net/udp/dhcp.c +++ b/src/net/udp/dhcp.c @@ -110,6 +110,14 @@ struct setting user_class_setting __setting = { .type = &setting_type_string, }; +/** Use cached network settings */ +struct setting use_cached_setting __setting = { + .name = "use-cached", + .description = "Use cached network settings", + .tag = DHCP_EB_USE_CACHED, + .type = &setting_type_uint8, +}; + /** * Name a DHCP packet type * @@ -1237,16 +1245,28 @@ static struct sockaddr dhcp_peer = { * * @v job Job control interface * @v netdev Network device - * @ret rc Return status code + * @ret rc Return status code, or positive if cached * * Starts DHCP on the specified network device. If successful, the * DHCPACK (and ProxyDHCPACK, if applicable) will be registered as * option sources. + * + * On a return of 0, a background job has been started to perform the + * DHCP request. Any nonzero return means the job has not been + * started; a positive return value indicates the success condition of + * having fetched the appropriate data from cached information. */ int start_dhcp ( struct job_interface *job, struct net_device *netdev ) { struct dhcp_session *dhcp; int rc; + /* Check for cached DHCP information */ + get_cached_dhcpack(); + if ( fetch_uintz_setting ( NULL, &use_cached_setting ) ) { + DBG ( "DHCP using cached network settings\n" ); + return 1; + } + /* Allocate and initialise structure */ dhcp = zalloc ( sizeof ( *dhcp ) ); if ( ! dhcp ) |