4 files changed, 11 insertions, 0 deletions
diff --git a/lib/libstand/bootp.c b/lib/libstand/bootp.c
index 1af7bd5..f3bc816 100644
--- a/lib/libstand/bootp.c
+++ b/lib/libstand/bootp.c
@@ -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)
diff --git a/lib/libstand/bootp.h b/lib/libstand/bootp.h
index ed9101f..47e5649 100644
--- a/lib/libstand/bootp.h
+++ b/lib/libstand/bootp.h
@@ -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)
diff --git a/lib/libstand/globals.c b/lib/libstand/globals.c
index 0310823..8284fae 100644
--- a/lib/libstand/globals.c
+++ b/lib/libstand/globals.c
@@ -32,5 +32,6 @@ struct	in_addr rootip;			/* root ip address */
 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 */
 
diff --git a/lib/libstand/net.h b/lib/libstand/net.h
index 94f2aab..ce7df49 100644
--- a/lib/libstand/net.h
+++ b/lib/libstand/net.h
@@ -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 */