[PATCH 2/3] net: dhcp: add private extention 224 to pass the oftree file via dhcp.

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

DHCP option 224 to 254 are for private use, so use one.

Export it via env dhcp_oftree_file.

E.g. the ISC dhcp server can be configured with

   | option oftree-path code 224 = string
   | class "at91sam9x5ek" {
   | match if substring (option vendor-class-identifier,0,20) = "barebox-at91sam9x5ek";
   |
   | filename "/tftpboot/atmel/at91sam9x5/sam9x5ek/zImage";
   | option tftp-server-name "192.168.200.98";
   | option root-path "192.168.200.98:/opt/work/buildroot/build/sam9x5/target";
   | option oftree-path "/tftpboot/atmel/at91sam9x5/sam9x5ek/sam9g25ek/dtb";
   | }

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 net/dhcp.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/net/dhcp.c b/net/dhcp.c
index ad32b53..0116ba4 100644
--- a/net/dhcp.c
+++ b/net/dhcp.c
@@ -201,6 +201,10 @@ struct dhcp_opt dhcp_options[] = {
 		.option = 67,
 		.handle = bootfile_vendorex_handle,
 		.barebox_var_name = "bootfile",
+	}, {
+		.option = 224,
+		.handle = env_str_handle,
+		.barebox_var_name = "dhcp_oftree_file",
 	},
 };
 
@@ -702,3 +706,4 @@ BAREBOX_MAGICVAR(dhcp_client_uuid, "cliend uuid to send to the DHCP server");
 BAREBOX_MAGICVAR(dhcp_client_id, "cliend id to send to the DHCP server");
 BAREBOX_MAGICVAR(dhcp_user_class, "user class to send to the DHCP server");
 BAREBOX_MAGICVAR(dhcp_tftp_server_name, "TFTP server Name returned from DHCP request");
+BAREBOX_MAGICVAR(dhcp_oftree_file, "OF tree returned from DHCP request (option 224)");
-- 
1.7.9.1


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