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Try to extract the RFC1048 data from PXE. If we get enough info we can skip

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the bootp(). It removes unnecessary DHCP request from pxeloader.

Submitted by:	kczekirda
Sponsored by:	Oktawave
Initiated by:	Matthew Dillon
Reviewed by:	smh, gnn, bapt, oshogbo
MFC after:	3 weeks
Differential Revision:	https://reviews.freebsd.org/D9847
This commit is contained in:
Mariusz Zaborski 2017-03-09 06:01:24 +00:00
parent 312227566c
commit 4cd385d9e9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=314948
3 changed files with 44 additions and 2 deletions
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11
lib/libstand/bootp.c
View File

@ -344,6 +344,17 @@ time_t tleft;
return (-1);
}
int
dhcp_try_rfc1048(u_char *cp, u_int len)
{
expected_dhcpmsgtype = DHCPACK;
if (bcmp(vm_rfc1048, cp, sizeof(vm_rfc1048)) == 0) {
return (vend_rfc1048(cp, len));
}
return (-1);
}
static int
vend_rfc1048(cp, len)
u_char *cp;

6
lib/libstand/bootp.h
View File

@ -22,6 +22,8 @@
* $FreeBSD$
*/
#ifndef _BOOTP_H_
#define _BOOTP_H_
struct bootp {
unsigned char bp_op; /* packet opcode type */
@ -145,3 +147,7 @@ struct cmu_vend {
/* v_flags values */
#define VF_SMASK 1 /* Subnet mask field contains valid data */
int dhcp_try_rfc1048(u_char *cp, u_int len);
#endif /* _BOOTP_H_ */

29
sys/boot/i386/libi386/pxe.c
View File

@ -101,6 +101,7 @@ extern void __bangpxeentry(void);
extern u_int16_t __pxenvseg;
extern u_int16_t __pxenvoff;
extern void __pxenventry(void);
extern struct in_addr servip;
struct netif_dif pxe_ifs[] = {
/* dif_unit dif_nsel dif_stats dif_private */
@ -276,17 +277,38 @@ pxe_open(struct open_file *f, ...)
}
if (pxe_debug)
printf("pxe_open: netif_open() succeeded\n");
if (socktodesc(pxe_sock) == NULL) {
printf("pxe_open: bad socket %d\n", pxe_sock);
return (ENXIO);
}
}
if (rootip.s_addr == 0) {
/*
* Do a bootp/dhcp request to find out where our
* Try to extract the RFC1048 data from PXE.
* If fail do a bootp/dhcp request to find out where our
* NFS/TFTP server is. Even if we dont get back
* the proper information, fall back to the server
* which brought us to life and a default rootpath.
*/
bootp(pxe_sock, BOOTP_PXE);
if (dhcp_try_rfc1048(bootplayer.vendor.d, BOOTP_DHCPVEND) < 0) {
if (pxe_debug)
printf("pxe_open: no RFC1048 data in PXE Cache\n");
bootp(pxe_sock, BOOTP_PXE);
} else if (pxe_debug) {
printf("pxe_open: loaded RFC1048 data from PXE Cache\n");
}
if (rootip.s_addr == 0)
rootip.s_addr = bootplayer.sip;
if (gateip.s_addr == 0)
gateip.s_addr = bootplayer.gip;
if (myip.s_addr == 0)
myip.s_addr = bootplayer.yip;
if (servip.s_addr == 0)
servip = rootip;
netproto = NET_NFS;
if (tftpip.s_addr != 0) {
@ -323,6 +345,9 @@ pxe_open(struct open_file *f, ...)
printf("pxe_open: server addr: %s\n", inet_ntoa(rootip));
printf("pxe_open: server path: %s\n", rootpath);
printf("pxe_open: gateway ip: %s\n", inet_ntoa(gateip));
printf("pxe_open: my ip: %s\n", inet_ntoa(myip));
printf("pxe_open: netmask: %s\n", intoa(netmask));
printf("pxe_open: servip: %s\n", inet_ntoa(servip));
if (netproto == NET_TFTP) {
setenv("boot.tftproot.server", inet_ntoa(rootip), 1);