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Date:      Mon, 21 Mar 2016 14:58:12 +0000 (UTC)
From:      Ian Lepore <ian@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r297150 - head/lib/libstand
Message-ID:  <201603211458.u2LEwC0C006065@repo.freebsd.org>
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Author: ian
Date: Mon Mar 21 14:58:12 2016
New Revision: 297150
URL: https://svnweb.freebsd.org/changeset/base/297150

Log:
  If the dhcp server delivers an interface-mtu option, parse it and store
  the value in a new global intf_mtu for use by the application.
  
  These changes were inspired by the patch provided by Robert Blayzor in
  PR 187094, and will allow loader(8) to propagate the value to the kernel
  along with the other nfs_diskless parms delivered via environment vars.

Modified:
  head/lib/libstand/bootp.c
  head/lib/libstand/bootp.h
  head/lib/libstand/globals.c
  head/lib/libstand/net.h

Modified: head/lib/libstand/bootp.c
==============================================================================
--- head/lib/libstand/bootp.c	Mon Mar 21 14:51:51 2016	(r297149)
+++ head/lib/libstand/bootp.c	Mon Mar 21 14:58:12 2016	(r297150)
@@ -39,6 +39,7 @@
 __FBSDID("$FreeBSD$");
 
 #include <sys/types.h>
+#include <sys/endian.h>
 #include <netinet/in.h>
 #include <netinet/in_systm.h>
 
@@ -393,6 +394,13 @@ vend_rfc1048(cp, len)
 				val = (const char *)cp;
 			strlcpy(hostname, val, sizeof(hostname));
 		}
+		if (tag == TAG_INTF_MTU) {
+			if ((val = getenv("dhcp.interface-mtu")) != NULL) {
+				intf_mtu = (u_int)strtoul(val, NULL, 0);
+			} else {
+				intf_mtu = be16dec(cp);
+			}
+		}
 #ifdef SUPPORT_DHCP
 		if (tag == TAG_DHCP_MSGTYPE) {
 			if(*cp != expected_dhcpmsgtype)

Modified: head/lib/libstand/bootp.h
==============================================================================
--- head/lib/libstand/bootp.h	Mon Mar 21 14:51:51 2016	(r297149)
+++ head/lib/libstand/bootp.h	Mon Mar 21 14:58:12 2016	(r297150)
@@ -91,6 +91,7 @@ struct bootp {
 #define TAG_DOMAINNAME		((unsigned char)  15)
 #define TAG_SWAPSERVER		((unsigned char)  16)
 #define TAG_ROOTPATH		((unsigned char)  17)
+#define TAG_INTF_MTU		((unsigned char)  26)
 
 #ifdef SUPPORT_DHCP
 #define TAG_REQ_ADDR		((unsigned char)  50)

Modified: head/lib/libstand/globals.c
==============================================================================
--- head/lib/libstand/globals.c	Mon Mar 21 14:51:51 2016	(r297149)
+++ head/lib/libstand/globals.c	Mon Mar 21 14:58:12 2016	(r297150)
@@ -32,5 +32,6 @@ struct	in_addr rootip;			/* root ip addr
 struct	in_addr swapip;			/* swap ip address */
 struct	in_addr gateip;			/* swap ip address */
 n_long	netmask = 0xffffff00;		/* subnet or net mask */
+u_int	intf_mtu;			/* interface mtu from bootp/dhcp */
 int	errno;				/* our old friend */
 

Modified: head/lib/libstand/net.h
==============================================================================
--- head/lib/libstand/net.h	Mon Mar 21 14:51:51 2016	(r297149)
+++ head/lib/libstand/net.h	Mon Mar 21 14:58:12 2016	(r297150)
@@ -83,6 +83,7 @@ extern	struct in_addr swapip;
 extern	struct in_addr gateip;
 extern	struct in_addr nameip;
 extern	n_long netmask;
+extern	u_int intf_mtu;
 
 extern	int debug;			/* defined in the machdep sources */

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