From: Alexander Graf <agraf@suse.de>
Date: Fri, 15 Jun 2018 08:29:28 +0000 (+0200)
Subject: net: Add option to prefer bootp/dhcp serverip
X-Git-Tag: v2018.07-rc3~1^2~1
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=bdce340cc6a17efe1d980eda378c3b1984059362;p=oweals%2Fu-boot.git

net: Add option to prefer bootp/dhcp serverip

Currently we can choose between 2 different types of behavior for the
serverip variable:

  1) Always overwrite it with the DHCP server IP address (default)
  2) Ignore what the DHCP server says (CONFIG_BOOTP_SERVERIP)

This patch adds a 3rd option:

  3) Use serverip from DHCP if no serverip is given
     (CONFIG_BOOTP_PREFER_SERVERIP)

With this new option, we can have the default case that a boot file gets
loaded from the DHCP provided TFTP server work while allowing users to
specify their own serverip variable to explicitly use a different tftp
server.

Signed-off-by: Alexander Graf <agraf@suse.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
---

diff --git a/cmd/Kconfig b/cmd/Kconfig
index bbf9fc9113..aec209006d 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1121,6 +1121,16 @@ config BOOTP_HOSTNAME
 	help
 	  The name may or may not be qualified with the local domain name.
 
+config BOOTP_PREFER_SERVERIP
+	bool "serverip variable takes precedent over DHCP server IP."
+	depends on CMD_BOOTP
+	help
+	  By default a BOOTP/DHCP reply will overwrite the 'serverip' variable.
+
+	  With this option enabled, the 'serverip' variable in the environment
+	  takes precedence over DHCP server IP and will only be set by the DHCP
+	  server if not already set in the environment.
+
 config BOOTP_SUBNETMASK
 	bool "Request & store 'netmask' from BOOTP/DHCP server"
 	default y
diff --git a/net/bootp.c b/net/bootp.c
index fdcb4374a0..9a2b512e4a 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -147,9 +147,14 @@ static void store_net_params(struct bootp_hdr *bp)
 {
 #if !defined(CONFIG_BOOTP_SERVERIP)
 	struct in_addr tmp_ip;
+	bool overwrite_serverip = true;
+
+#if defined(CONFIG_BOOTP_PREFER_SERVERIP)
+	overwrite_serverip = false;
+#endif
 
 	net_copy_ip(&tmp_ip, &bp->bp_siaddr);
-	if (tmp_ip.s_addr != 0)
+	if (tmp_ip.s_addr != 0 && (overwrite_serverip || !net_server_ip.s_addr))
 		net_copy_ip(&net_server_ip, &bp->bp_siaddr);
 	memcpy(net_server_ethaddr,
 	       ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);