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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