On Tue, Mar 06, 2012 at 06:36:15PM +0100, Enrico Scholz wrote:
> For net boot setups it is useful to submit boot params like server or
> bootfile over dhcp. To distinguish barebox from e.g. pxe machines, a
> custom vendor id can be sent in dhcp discover/request messages.
>
> E.g. the ISC dhcp server can be configured with
>
> | if substring(option vendor-class-identifier,0,8) = "barebox:" {
> | next-server 192.168.3.24;
> | server-name "192.168.3.24";
> | option tftp-server-name "192.168.3.24";
> | option root-path = concat("/srv/sysroots/by-mac/",
> | binary-to-ascii (16, 8, "-", substring (hardware, 1, 6)));
> | }
>
> to sent boot params which are valid for barebox hosts only.
I like this one aswell. The string shouldn't be hardcoded though.
It could be a command line option to dhcp.
Sascha
>
> Signed-off-by: Enrico Scholz <enrico.scholz@xxxxxxxxxxxxxxxxx>
> ---
> net/Kconfig | 13 +++++++++++++
> net/dhcp.c | 12 ++++++++++++
> 2 files changed, 25 insertions(+), 0 deletions(-)
>
> diff --git a/net/Kconfig b/net/Kconfig
> index 3169d20..56d6ee8 100644
> --- a/net/Kconfig
> +++ b/net/Kconfig
> @@ -7,6 +7,19 @@ config NET_DHCP
> bool
> prompt "dhcp support"
>
> +config NET_DHCP_VENDOR_ID
> + string
> + prompt "dhcp vendor id"
> + depends on NET_DHCP
> + default "barebox:default"
> + help
> + DHCP Vendor ID (code 60) submitted in DHCP requests. It can
> + be used in the DHCP server's configuration to select options
> + (e.g. bootfile or server) which are valid for barebox clients
> + only.
> +
> + An empty string will suppress generation of such requests.
> +
> config NET_NFS
> bool
> prompt "nfs support"
> diff --git a/net/dhcp.c b/net/dhcp.c
> index 2ce9090..65f2614 100644
> --- a/net/dhcp.c
> +++ b/net/dhcp.c
> @@ -129,6 +129,7 @@ static void bootp_copy_net_params(struct bootp *bp)
> */
> static int dhcp_extended (u8 *e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
> {
> + size_t vendor_id_len = sizeof CONFIG_NET_DHCP_VENDOR_ID - 1;
> u8 *start = e;
> u8 *cnt;
>
> @@ -168,6 +169,17 @@ static int dhcp_extended (u8 *e, int message_type, IPaddr_t ServerID, IPaddr_t R
> *e++ = tmp & 0xff;
> }
>
> + /* 64 is some arbitrary value to prevent generation of too
> + * large dhcp requests. */
> + BUILD_BUG_ON(sizeof CONFIG_NET_DHCP_VENDOR_ID > 64);
> +
> + if (vendor_id_len > 0) {
> + *e++ = 60;
> + *e++ = vendor_id_len;
> + memcpy(e, CONFIG_NET_DHCP_VENDOR_ID, vendor_id_len);
> + e += vendor_id_len;
> + }
> +
> *e++ = 55; /* Parameter Request List */
> cnt = e++; /* Pointer to count of requested items */
> *cnt = 0;
> --
> 1.7.7.6
>
>
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