Author: ian
Date: Mon Mar 21 14:51:51 2016
New Revision: 297149
URL: https://svnweb.freebsd.org/changeset/base/297149
Log:
If the dhcp server provides an interface-mtu option, parse the value and
set that mtu on the interface.
These changes are based on the patch submitted by Robert Blayzor in the
PR, but I changed things around a bit, so the blame for any mistakes
belongs to me.
PR: 187094
Modified:
head/sys/nfs/bootp_subr.c
Modified: head/sys/nfs/bootp_subr.c
==============================================================================
--- head/sys/nfs/bootp_subr.c Mon Mar 21 14:39:03 2016 (r297148)
+++ head/sys/nfs/bootp_subr.c Mon Mar 21 14:51:51 2016 (r297149)
@@ -49,6 +49,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
+#include <sys/endian.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
@@ -158,6 +159,7 @@ struct bootpc_ifcontext {
int dhcpquerytype; /* dhcp type sent */
struct in_addr dhcpserver;
int gotdhcpserver;
+ uint16_t mtu;
};
#define TAG_MAXLEN 1024
@@ -199,6 +201,7 @@ struct bootpc_globalcontext {
#define TAG_ROUTERS 3 /* Routers (in order of preference) */
#define TAG_HOSTNAME 12 /* Client host name */
#define TAG_ROOT 17 /* Root path */
+#define TAG_INTF_MTU 26 /* Interface MTU Size (RFC2132) */
/* DHCP specific tags */
#define TAG_OVERLOAD 52 /* Option Overload */
@@ -1034,7 +1037,19 @@ bootpc_adjust_interface(struct bootpc_if
return (0);
}
- printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
+ printf("Adjusted interface %s", ifctx->ireq.ifr_name);
+
+ /* Do BOOTP interface options */
+ if (ifctx->mtu != 0) {
+ printf(" (MTU=%d%s)", ifctx->mtu,
+ (ifctx->mtu > 1514) ? "/JUMBO" : "");
+ ifr->ifr_mtu = ifctx->mtu;
+ error = ifioctl(bootp_so, SIOCSIFMTU, (caddr_t) ifr, td);
+ if (error != 0)
+ panic("%s: SIOCSIFMTU, error=%d", __func__, error);
+ }
+ printf("\n");
+
/*
* Do enough of ifconfig(8) so that the chosen interface
* can talk to the servers. (just set the address)
@@ -1522,6 +1537,11 @@ bootpc_decode_reply(struct nfsv3_diskles
p[i] = '\0';
}
+ p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
+ TAG_INTF_MTU);
+ if (p != NULL) {
+ ifctx->mtu = be16dec(p);
+ }
printf("\n");
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