I have a DHCP Server which is sending DHCP option 134 (a simple string of "this that something else"), and an altered MTU (1300) using dnsmasq:
I have also confirmed that both, the BIOS (not UEFI) PXE client, and the second DHCP request from the FreeBSD loader (loader.efi), are being sent the above with their leases using
The interface mtu is being set correctly, but the
In /usr/src/sys/nfs/bootp_subr.c it has two sections relating to this:
So the code is there and the mtu is set correctly and is after the bootp_cookie code.
One strange thing is, that while that code is there, when I issue
!!!
Seems like the function SYSCTL_STRING is not being compiled into GENERIC?
Can anyone shead any light as to why I am getting unknown oid for 'kern.bootp_cookie', i.e. why the oid is missing, and as to why the code isn't behaving as expected?
Thanks in advance,
James.
Code:
dhcp-option-force=FREEBSD,26,1300
dhcp-option-force=FREEBSD,134,this that something else
Code:
dnsmasq-dhcp: 1 sent size: 2 option: 26 mtu 1300
dnsmasq-dhcp: 1 sent size: 24 option:134 74:68:69:73:20:74:68:61:74:20:73:6f:6d:65...I have also confirmed that both, the BIOS (not UEFI) PXE client, and the second DHCP request from the FreeBSD loader (loader.efi), are being sent the above with their leases using
tcpdump -n -vvvv port 67 or port 68.The interface mtu is being set correctly, but the
sysctl kern.bootp_cookie is not set.In /usr/src/sys/nfs/bootp_subr.c it has two sections relating to this:
Code:
(Line 217)
#define TAG_COOKIE 134 /* ascii info for userland, via sysctl */
....
(Line 237)
static char bootp_cookie[128];
static struct socket *bootp_so;
SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
....
Code:
(Line 1462) bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
...
}
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, TAG_COOKIE);
if (p != NULL) { /* store in a sysctl variable */
int i, l = sizeof(bootp_cookie) - 1;
for (i = 0; i < l && p[i] != '\0'; i++)
bootp_cookie[i] = p[i];
p[i] = '\0';
}
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, TAG_INTF_MTU);
if (p != NULL) {
ifctx->mtu = be16dec(p);
}
...
}So the code is there and the mtu is set correctly and is after the bootp_cookie code.
One strange thing is, that while that code is there, when I issue
sysctl kern.bootp_cookie, it responds with:
Code:
sysctl: unknown oid 'kern.bootp_cookie'Seems like the function SYSCTL_STRING is not being compiled into GENERIC?
Can anyone shead any light as to why I am getting unknown oid for 'kern.bootp_cookie', i.e. why the oid is missing, and as to why the code isn't behaving as expected?
Thanks in advance,
James.
