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If the dhcp server delivers an interface-mtu option, parse it and store

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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.
This commit is contained in:
Ian Lepore 2016-03-21 14:58:12 +00:00
parent a6c1490807
commit 00f66a5236
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=297150
4 changed files with 11 additions and 0 deletions
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8
lib/libstand/bootp.c
View File

@ -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)

1
lib/libstand/bootp.h
View File

@ -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)

1
lib/libstand/globals.c
View File

@ -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 */

1
lib/libstand/net.h
View File

@ -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 */