[PATCH 3/8] net: dhcp: add support of tftp server ip or Etherboot file (option 150)

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if tftp server ip
	Use the tftp server name only if this option is not set.
	Export it also via env tftp_server_ip.
else
	Export it via end etherboot_file

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

  | option option-150 code 150 = ip-address;
  | option option-150-etherboot-file code 150 = 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 option-150 192.168.200.98;
  |         next-server 192.168.200.98;
  |         option root-path "192.168.200.98:/opt/work/buildroot/build/sam9x5/target";
  |         if substring (option dhcp-client-identifier,0,7) = "ser2net" {
  |                 filename "/tftpboot/atmel/at91sam9x5/sam9x5ek/zImage-ser2net";
  |                 ption option-150-etherboot-file "/tftpboot/test.sh";
  |         }
  | }

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
---
 net/dhcp.c |   21 ++++++++++++++++++++-
 1 files changed, 20 insertions(+), 1 deletions(-)

diff --git a/net/dhcp.c b/net/dhcp.c
index 6728717..adfb4a0 100644
--- a/net/dhcp.c
+++ b/net/dhcp.c
@@ -195,6 +195,8 @@ static int dhcp_extended (u8 *e, int message_type, IPaddr_t ServerID,
 	*cnt += 1;
 	*e++  = 66;		/* TFTP server name */
 	*cnt += 1;
+	*e++  = 150;		/* TFTP server ip */
+	*cnt += 1;
 	*e++  = 255;		/* End of the list */
 
 	/* Pad to minimal length */
@@ -255,6 +257,7 @@ static void dhcp_options_process(unsigned char *popt, struct bootp *bp)
 	IPaddr_t ip;
 	char str[256];
 	char tftpname[256];
+	bool is_tftpserverip = false;
 
 	while (popt < end && *popt != 0xff) {
 		oplen = *(popt + 1);
@@ -327,6 +330,18 @@ static void dhcp_options_process(unsigned char *popt, struct bootp *bp)
 					setenv("bootfile", str);
 			}
 			break;
+		case 150:	/* TFTP server ip or Etherboot*/
+			if (oplen == sizeof(IPaddr_t)) {
+				is_tftpserverip = true;
+				ip = net_read_ip(popt + 2);
+				net_set_serverip(ip);
+				setenv_ip("tftp_server_ip", ip);
+			} else {
+				memcpy(str, popt + 2, oplen);
+				str[oplen] = 0;
+				setenv("etherboot_file", str);
+			}
+			break;
 		default:
 #ifdef CONFIG_BOOTP_VENDOREX
 			if (dhcp_vendorex_proc (popt))
@@ -338,7 +353,7 @@ static void dhcp_options_process(unsigned char *popt, struct bootp *bp)
 		popt += oplen + 2;	/* Process next option */
 	}
 
-	if (tftpname[0] != 0)
+	if (!is_tftpserverip && tftpname[0] != 0)
 		net_set_serverip(resolv(tftpname));
 }
 
@@ -468,6 +483,8 @@ static int do_dhcp(int argc, char *argv[])
 	setenv("domainname","");
 	setenv("rootpath","");
 	setenv("tftp_server_name","");
+	setenv("tftp_server_ip","");
+	setenv("etherboot_file","");
 
 	while((opt = getopt(argc, argv, "v:")) > 0) {
 		switch(opt) {
@@ -537,3 +554,5 @@ BAREBOX_MAGICVAR(domainname, "domainname returned from DHCP request");
 BAREBOX_MAGICVAR(rootpath, "rootpath returned from DHCP request");
 BAREBOX_MAGICVAR(dhcp_vendor_id, "vendor id to send to the DHCP server");
 BAREBOX_MAGICVAR(tftp_server_name, "TFTP server Name returned from DHCP request");
+BAREBOX_MAGICVAR(tftp_server_ip, "TFTP server IP returned from DHCP request");
+BAREBOX_MAGICVAR(etherboot_file, "Etherboot File returned from DHCP request");
-- 
1.7.9.1


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