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-rw-r--r--lib/libstand/bootp.c8
-rw-r--r--lib/libstand/bootp.h1
-rw-r--r--lib/libstand/globals.c1
-rw-r--r--lib/libstand/net.h1
4 files changed, 11 insertions, 0 deletions
diff --git a/lib/libstand/bootp.c b/lib/libstand/bootp.c
index 1af7bd5da113..f3bc81697911 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 ed9101f3ea89..47e5649ce9a0 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 03108232fff0..8284fae71d10 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 94f2aabf81e2..ce7df49f2de2 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 */