2015-10-15 1:54 GMT-07:00 <roy.qing...@gmail.com>:
> From: Li RongQing <roy.qing...@gmail.com>
>
> A dhcp server may provide parameters to a client from a pool of IP
> addresses and using a shared rootfs, or provide a specific set of
> parameters for a specific client, usually using the MAC address to
> identify each client individually. The dhcp protocol also specifies
> a client-id field which can be used to determine the correct
> parameters to supply when no MAC address is available. There is
> currently no way to tell the kernel to supply a specific client-id,
> only the userspace dhcp clients support this feature, but this can
> not be used when the network is needed before userspace is available
> such as when the root filesystem is on NFS.
>
> This patch is to be able to do something like "ip=dhcp,client_id_type,
> client_id_value", as a kernel parameter to enable the kernel to
> identify itself to the server.
>
> Signed-off-by: Li RongQing <roy.qing...@gmail.com>
> ---
> Documentation/filesystems/nfs/nfsroot.txt | 3 +++
> net/ipv4/ipconfig.c | 32
> ++++++++++++++++++++++++++++++-
> 2 files changed, 34 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/filesystems/nfs/nfsroot.txt
> b/Documentation/filesystems/nfs/nfsroot.txt
> index 2d66ed6..bb5ab6d 100644
> --- a/Documentation/filesystems/nfs/nfsroot.txt
> +++ b/Documentation/filesystems/nfs/nfsroot.txt
> @@ -157,6 +157,9 @@
> ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:
> both: use both BOOTP and RARP but not DHCP
> (old option kept for backwards compatibility)
>
> + if dhcp is used, the client identifier can be used by
> following
> + format "ip=dhcp,client-id-type,client-id-value"
> +
> Default: any
>
> <dns0-ip> IP address of first nameserver.
> diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
> index ed4ef09..0bc7412 100644
> --- a/net/ipv4/ipconfig.c
> +++ b/net/ipv4/ipconfig.c
> @@ -146,6 +146,10 @@ u8 root_server_path[256] = { 0, }; /* Path to mount as
> root */
> /* vendor class identifier */
> static char vendor_class_identifier[253] __initdata;
>
> +#if defined(CONFIG_IP_PNP_DHCP)
> +static char dhcp_client_identifier[253] __initdata;
> +#endif
> +
> /* Persistent data: */
>
> static int ic_proto_used; /* Protocol used, if any */
> @@ -728,6 +732,16 @@ ic_dhcp_init_options(u8 *options)
> memcpy(e, vendor_class_identifier, len);
> e += len;
> }
> + len = strlen(dhcp_client_identifier + 1);
Did not you mean strlen(dhcp_client_identifer) + 1 instead?
--
Florian
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