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freebsd-nq/sys/nfs/bootp_subr.c
Alfredo Dal'Ava Junior 3cb9f1976c nfs: skip bootpc when vfs.root.mountfrom is other than nfs 
If "vfs.root.mountfrom" is set and the value is something other
than "nfs:*", it means the user doesn't want to mount root via nfs,
there's no reason to continue with bootpc

This fixes the powerpcspe kernel (MPC85XXSPE) that's compiled with
BOOTP_NFSROOT by default and gets stuck on bootpc/dhcp request loop
when no DHCP server is available on the network, even when user
specifies a local disk via "vfs.root.mountfrom" kernel parameter.

Reviewed by:	imp
MFC after:	2 weeks
Sponsored by:	Instituto de Pesquisas Eldorado (eldorado.org.br)
Differential Revision:	https://reviews.freebsd.org/D35098
2022-05-31 16:07:27 -03:00

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/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright (c) 1995 Gordon Ross, Adam Glass
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* based on:
* nfs/krpc_subr.c
* $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
*/
#define IN_HISTORICAL_NETS /* include class masks */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_bootp.h"
#include "opt_nfs.h"
#include "opt_rootdevname.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/route.h>
#include <net/route/route_ctl.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/vnet.h>
#include <nfs/nfsproto.h>
#include <nfsclient/nfs.h>
#include <nfs/nfsdiskless.h>
#include <nfs/krpc.h>
#include <nfs/xdr_subs.h>
#define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */
#ifndef BOOTP_SETTLE_DELAY
#define BOOTP_SETTLE_DELAY 3
#endif
/*
* Wait 10 seconds for interface appearance
* USB ethernet adapters might require some time to pop up
*/
#ifndef BOOTP_IFACE_WAIT_TIMEOUT
#define BOOTP_IFACE_WAIT_TIMEOUT 10
#endif
/*
* What is the longest we will wait before re-sending a request?
* Note this is also the frequency of "RPC timeout" messages.
* The re-send loop count sup linearly to this maximum, so the
* first complaint will happen after (1+2+3+4+5)=15 seconds.
*/
#define MAX_RESEND_DELAY 5 /* seconds */
/* Definitions from RFC951 */
struct bootp_packet {
u_int8_t op;
u_int8_t htype;
u_int8_t hlen;
u_int8_t hops;
u_int32_t xid;
u_int16_t secs;
u_int16_t flags;
struct in_addr ciaddr;
struct in_addr yiaddr;
struct in_addr siaddr;
struct in_addr giaddr;
unsigned char chaddr[16];
char sname[64];
char file[128];
unsigned char vend[1222];
};
struct bootpc_ifcontext {
STAILQ_ENTRY(bootpc_ifcontext) next;
struct bootp_packet call;
struct bootp_packet reply;
int replylen;
int overload;
union {
struct ifreq _ifreq;
struct in_aliasreq _in_alias_req;
} _req;
#define ireq _req._ifreq
#define iareq _req._in_alias_req
struct ifnet *ifp;
struct sockaddr_dl *sdl;
struct sockaddr_in myaddr;
struct sockaddr_in netmask;
struct sockaddr_in gw;
int gotgw;
int gotnetmask;
int gotrootpath;
int outstanding;
int sentmsg;
u_int32_t xid;
enum {
IF_BOOTP_UNRESOLVED,
IF_BOOTP_RESOLVED,
IF_BOOTP_FAILED,
IF_DHCP_UNRESOLVED,
IF_DHCP_OFFERED,
IF_DHCP_RESOLVED,
IF_DHCP_FAILED,
} state;
int dhcpquerytype; /* dhcp type sent */
struct in_addr dhcpserver;
int gotdhcpserver;
uint16_t mtu;
};
#define TAG_MAXLEN 1024
struct bootpc_tagcontext {
char buf[TAG_MAXLEN + 1];
int overload;
int badopt;
int badtag;
int foundopt;
int taglen;
};
struct bootpc_globalcontext {
STAILQ_HEAD(, bootpc_ifcontext) interfaces;
u_int32_t xid;
int any_root_overrides;
int gotrootpath;
int gotgw;
int ifnum;
int secs;
int starttime;
struct bootp_packet reply;
int replylen;
struct bootpc_ifcontext *setrootfs;
struct bootpc_ifcontext *sethostname;
struct bootpc_tagcontext tmptag;
struct bootpc_tagcontext tag;
};
#define IPPORT_BOOTPC 68
#define IPPORT_BOOTPS 67
#define BOOTP_REQUEST 1
#define BOOTP_REPLY 2
/* Common tags */
#define TAG_PAD 0 /* Pad option, implicit length 1 */
#define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */
#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 */
#define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */
#define TAG_END 255 /* End Option (i.e. no more options) */
/* Overload values */
#define OVERLOAD_FILE 1
#define OVERLOAD_SNAME 2
/* Site specific tags: */
#define TAG_ROOTOPTS 130
#define TAG_COOKIE 134 /* ascii info for userland, via sysctl */
#define TAG_DHCP_MSGTYPE 53
#define TAG_DHCP_REQ_ADDR 50
#define TAG_DHCP_SERVERID 54
#define TAG_DHCP_LEASETIME 51
#define TAG_VENDOR_INDENTIFIER 60
#define DHCP_NOMSG 0
#define DHCP_DISCOVER 1
#define DHCP_OFFER 2
#define DHCP_REQUEST 3
#define DHCP_ACK 5
/* NFS read/write block size */
#ifndef BOOTP_BLOCKSIZE
#define BOOTP_BLOCKSIZE 8192
#endif
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");
/* mountd RPC */
static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp,
int *fhsizep, struct nfs_args *args, struct thread *td);
static int setfs(struct sockaddr_in *addr, char *path, char *p,
const struct in_addr *siaddr);
static int getdec(char **ptr);
static int getip(char **ptr, struct in_addr *ip);
static void mountopts(struct nfs_args *args, char *p);
static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
static int xdr_int_decode(struct mbuf **ptr, int *iptr);
static void print_in_addr(struct in_addr addr);
static void print_sin_addr(struct sockaddr_in *addr);
static void clear_sinaddr(struct sockaddr_in *sin);
static void allocifctx(struct bootpc_globalcontext *gctx);
static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
struct thread *td);
static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
struct bootp_packet *bp, int len, int tag);
static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
unsigned char *start, int len, int tag);
#ifdef BOOTP_DEBUG
void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
void bootpboot_p_iflist(void);
#endif
static int bootpc_call(struct bootpc_globalcontext *gctx,
struct thread *td);
static void bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
struct thread *td);
static void bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
struct bootpc_globalcontext *gctx, struct thread *td);
static void bootpc_decode_reply(struct nfsv3_diskless *nd,
struct bootpc_ifcontext *ifctx,
struct bootpc_globalcontext *gctx);
static int bootpc_received(struct bootpc_globalcontext *gctx,
struct bootpc_ifcontext *ifctx);
static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
/*
* In order to have multiple active interfaces with address 0.0.0.0
* and be able to send data to a selected interface, we first set
* mask to /8 on all interfaces, and temporarily set it to /0 when
* doing sosend().
*/
#ifdef BOOTP_DEBUG
void
bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
{
printf("%s flags %x, addr ",
ifp->if_xname, ifp->if_flags);
print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
printf(", broadcast ");
print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
printf(", netmask ");
print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
printf("\n");
}
void
bootpboot_p_iflist(void)
{
struct ifnet *ifp;
struct ifaddr *ifa;
printf("Interface list:\n");
IFNET_RLOCK();
for (ifp = CK_STAILQ_FIRST(&V_ifnet);
ifp != NULL;
ifp = CK_STAILQ_NEXT(ifp, if_link)) {
for (ifa = CK_STAILQ_FIRST(&ifp->if_addrhead);
ifa != NULL;
ifa = CK_STAILQ_NEXT(ifa, ifa_link))
if (ifa->ifa_addr->sa_family == AF_INET)
bootpboot_p_if(ifp, ifa);
}
IFNET_RUNLOCK();
}
#endif /* defined(BOOTP_DEBUG) */
static void
clear_sinaddr(struct sockaddr_in *sin)
{
bzero(sin, sizeof(*sin));
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
sin->sin_port = 0;
}
static void
allocifctx(struct bootpc_globalcontext *gctx)
{
struct bootpc_ifcontext *ifctx;
ifctx = malloc(sizeof(*ifctx), M_TEMP, M_WAITOK | M_ZERO);
ifctx->xid = gctx->xid;
#ifdef BOOTP_NO_DHCP
ifctx->state = IF_BOOTP_UNRESOLVED;
#else
ifctx->state = IF_DHCP_UNRESOLVED;
#endif
gctx->xid += 0x100;
STAILQ_INSERT_TAIL(&gctx->interfaces, ifctx, next);
}
static __inline int
bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
{
if (ifctx->state == IF_BOOTP_RESOLVED ||
ifctx->state == IF_DHCP_RESOLVED)
return 1;
return 0;
}
static __inline int
bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
{
if (ifctx->state == IF_BOOTP_UNRESOLVED ||
ifctx->state == IF_DHCP_UNRESOLVED)
return 1;
return 0;
}
static __inline int
bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
{
if (ifctx->state == IF_BOOTP_FAILED ||
ifctx->state == IF_DHCP_FAILED)
return 1;
return 0;
}
static int
bootpc_received(struct bootpc_globalcontext *gctx,
struct bootpc_ifcontext *ifctx)
{
unsigned char dhcpreplytype;
char *p;
/*
* Need timeout for fallback to less
* desirable alternative.
*/
/* This call used for the side effect (badopt flag) */
(void) bootpc_tag(&gctx->tmptag, &gctx->reply,
gctx->replylen,
TAG_END);
/* If packet is invalid, ignore it */
if (gctx->tmptag.badopt != 0)
return 0;
p = bootpc_tag(&gctx->tmptag, &gctx->reply,
gctx->replylen, TAG_DHCP_MSGTYPE);
if (p != NULL)
dhcpreplytype = *p;
else
dhcpreplytype = DHCP_NOMSG;
switch (ifctx->dhcpquerytype) {
case DHCP_DISCOVER:
if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */
#ifndef BOOTP_FORCE_DHCP
&& dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */
#endif
)
return 0;
break;
case DHCP_REQUEST:
if (dhcpreplytype != DHCP_ACK)
return 0;
case DHCP_NOMSG:
break;
}
/* Ignore packet unless it gives us a root tag we didn't have */
if ((ifctx->state == IF_BOOTP_RESOLVED ||
(ifctx->dhcpquerytype == DHCP_DISCOVER &&
(ifctx->state == IF_DHCP_OFFERED ||
ifctx->state == IF_DHCP_RESOLVED))) &&
(bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen,
TAG_ROOT) != NULL ||
bootpc_tag(&gctx->tmptag, &gctx->reply,
gctx->replylen,
TAG_ROOT) == NULL))
return 0;
bcopy(&gctx->reply, &ifctx->reply, gctx->replylen);
ifctx->replylen = gctx->replylen;
/* XXX: Only reset if 'perfect' response */
if (ifctx->state == IF_BOOTP_UNRESOLVED)
ifctx->state = IF_BOOTP_RESOLVED;
else if (ifctx->state == IF_DHCP_UNRESOLVED &&
ifctx->dhcpquerytype == DHCP_DISCOVER) {
if (dhcpreplytype == DHCP_OFFER)
ifctx->state = IF_DHCP_OFFERED;
else
ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */
} else if (ifctx->state == IF_DHCP_OFFERED &&
ifctx->dhcpquerytype == DHCP_REQUEST)
ifctx->state = IF_DHCP_RESOLVED;
if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
ifctx->state != IF_BOOTP_RESOLVED) {
p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen, TAG_DHCP_SERVERID);
if (p != NULL && gctx->tmptag.taglen == 4) {
memcpy(&ifctx->dhcpserver, p, 4);
ifctx->gotdhcpserver = 1;
} else
ifctx->gotdhcpserver = 0;
return 1;
}
ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen,
TAG_ROOT) != NULL);
ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen,
TAG_ROUTERS) != NULL);
ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen,
TAG_SUBNETMASK) != NULL);
return 1;
}
static int
bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
{
struct sockaddr_in *sin, dst;
struct uio auio;
struct sockopt sopt;
struct iovec aio;
int error, on, rcvflg, timo, len;
time_t atimo;
time_t rtimo;
struct timeval tv;
struct bootpc_ifcontext *ifctx;
int outstanding;
int gotrootpath;
int retry;
const char *s;
tv.tv_sec = 1;
tv.tv_usec = 0;
bzero(&sopt, sizeof(sopt));
sopt.sopt_dir = SOPT_SET;
sopt.sopt_level = SOL_SOCKET;
sopt.sopt_name = SO_RCVTIMEO;
sopt.sopt_val = &tv;
sopt.sopt_valsize = sizeof tv;
error = sosetopt(bootp_so, &sopt);
if (error != 0)
goto out;
/*
* Enable broadcast.
*/
on = 1;
sopt.sopt_name = SO_BROADCAST;
sopt.sopt_val = &on;
sopt.sopt_valsize = sizeof on;
error = sosetopt(bootp_so, &sopt);
if (error != 0)
goto out;
/*
* Disable routing.
*/
on = 1;
sopt.sopt_name = SO_DONTROUTE;
sopt.sopt_val = &on;
sopt.sopt_valsize = sizeof on;
error = sosetopt(bootp_so, &sopt);
if (error != 0)
goto out;
/*
* Bind the local endpoint to a bootp client port.
*/
sin = &dst;
clear_sinaddr(sin);
sin->sin_port = htons(IPPORT_BOOTPC);
error = sobind(bootp_so, (struct sockaddr *)sin, td);
if (error != 0) {
printf("bind failed\n");
goto out;
}
/*
* Setup socket address for the server.
*/
sin = &dst;
clear_sinaddr(sin);
sin->sin_addr.s_addr = INADDR_BROADCAST;
sin->sin_port = htons(IPPORT_BOOTPS);
/*
* Send it, repeatedly, until a reply is received,
* but delay each re-send by an increasing amount.
* If the delay hits the maximum, start complaining.
*/
timo = 0;
rtimo = 0;
for (;;) {
outstanding = 0;
gotrootpath = 0;
STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
if (bootpc_ifctx_isresolved(ifctx) != 0 &&
bootpc_tag(&gctx->tmptag, &ifctx->reply,
ifctx->replylen,
TAG_ROOT) != NULL)
gotrootpath = 1;
}
STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
struct in_aliasreq *ifra = &ifctx->iareq;
sin = (struct sockaddr_in *)&ifra->ifra_mask;
ifctx->outstanding = 0;
if (bootpc_ifctx_isresolved(ifctx) != 0 &&
gotrootpath != 0) {
continue;
}
if (bootpc_ifctx_isfailed(ifctx) != 0)
continue;
outstanding++;
ifctx->outstanding = 1;
/* Proceed to next step in DHCP negotiation */
if ((ifctx->state == IF_DHCP_OFFERED &&
ifctx->dhcpquerytype != DHCP_REQUEST) ||
(ifctx->state == IF_DHCP_UNRESOLVED &&
ifctx->dhcpquerytype != DHCP_DISCOVER) ||
(ifctx->state == IF_BOOTP_UNRESOLVED &&
ifctx->dhcpquerytype != DHCP_NOMSG)) {
ifctx->sentmsg = 0;
bootpc_compose_query(ifctx, td);
}
/* Send BOOTP request (or re-send). */
if (ifctx->sentmsg == 0) {
switch(ifctx->dhcpquerytype) {
case DHCP_DISCOVER:
s = "DHCP Discover";
break;
case DHCP_REQUEST:
s = "DHCP Request";
break;
case DHCP_NOMSG:
default:
s = "BOOTP Query";
break;
}
printf("Sending %s packet from "
"interface %s (%*D)\n",
s,
ifctx->ireq.ifr_name,
ifctx->sdl->sdl_alen,
(unsigned char *) LLADDR(ifctx->sdl),
":");
ifctx->sentmsg = 1;
}
aio.iov_base = (caddr_t) &ifctx->call;
aio.iov_len = sizeof(ifctx->call);
auio.uio_iov = &aio;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_WRITE;
auio.uio_offset = 0;
auio.uio_resid = sizeof(ifctx->call);
auio.uio_td = td;
/* Set netmask to 0.0.0.0 */
clear_sinaddr(sin);
error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra,
td);
if (error != 0)
panic("%s: SIOCAIFADDR, error=%d", __func__,
error);
error = sosend(bootp_so, (struct sockaddr *) &dst,
&auio, NULL, NULL, 0, td);
if (error != 0)
printf("%s: sosend: %d state %08x\n", __func__,
error, (int )bootp_so->so_state);
/* Set netmask to 255.0.0.0 */
sin->sin_addr.s_addr = htonl(0xff000000);
error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra,
td);
if (error != 0)
panic("%s: SIOCAIFADDR, error=%d", __func__,
error);
}
if (outstanding == 0 &&
(rtimo == 0 || time_second >= rtimo)) {
error = 0;
goto out;
}
/* Determine new timeout. */
if (timo < MAX_RESEND_DELAY)
timo++;
else {
printf("DHCP/BOOTP timeout for server ");
print_sin_addr(&dst);
printf("\n");
}
/*
* Wait for up to timo seconds for a reply.
* The socket receive timeout was set to 1 second.
*/
atimo = timo + time_second;
while (time_second < atimo) {
aio.iov_base = (caddr_t) &gctx->reply;
aio.iov_len = sizeof(gctx->reply);
auio.uio_iov = &aio;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_offset = 0;
auio.uio_resid = sizeof(gctx->reply);
auio.uio_td = td;
rcvflg = 0;
error = soreceive(bootp_so, NULL, &auio,
NULL, NULL, &rcvflg);
gctx->secs = time_second - gctx->starttime;
STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
if (bootpc_ifctx_isresolved(ifctx) != 0 ||
bootpc_ifctx_isfailed(ifctx) != 0)
continue;
ifctx->call.secs = htons(gctx->secs);
}
if (error == EWOULDBLOCK)
continue;
if (error != 0)
goto out;
len = sizeof(gctx->reply) - auio.uio_resid;
/* Do we have the required number of bytes ? */
if (len < BOOTP_MIN_LEN)
continue;
gctx->replylen = len;
/* Is it a reply? */
if (gctx->reply.op != BOOTP_REPLY)
continue;
/* Is this an answer to our query */
STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
if (gctx->reply.xid != ifctx->call.xid)
continue;
/* Same HW address size ? */
if (gctx->reply.hlen != ifctx->call.hlen)
continue;
/* Correct HW address ? */
if (bcmp(gctx->reply.chaddr,
ifctx->call.chaddr,
ifctx->call.hlen) != 0)
continue;
break;
}
if (ifctx != NULL) {
s = bootpc_tag(&gctx->tmptag,
&gctx->reply,
gctx->replylen,
TAG_DHCP_MSGTYPE);
if (s != NULL) {
switch (*s) {
case DHCP_OFFER:
s = "DHCP Offer";
break;
case DHCP_ACK:
s = "DHCP Ack";
break;
default:
s = "DHCP (unexpected)";
break;
}
} else
s = "BOOTP Reply";
printf("Received %s packet"
" on %s from ",
s,
ifctx->ireq.ifr_name);
print_in_addr(gctx->reply.siaddr);
if (gctx->reply.giaddr.s_addr !=
htonl(INADDR_ANY)) {
printf(" via ");
print_in_addr(gctx->reply.giaddr);
}
if (bootpc_received(gctx, ifctx) != 0) {
printf(" (accepted)");
if (ifctx->outstanding) {
ifctx->outstanding = 0;
outstanding--;
}
/* Network settle delay */
if (outstanding == 0)
atimo = time_second +
BOOTP_SETTLE_DELAY;
} else
printf(" (ignored)");
if (ifctx->gotrootpath ||
gctx->any_root_overrides) {
gotrootpath = 1;
rtimo = time_second +
BOOTP_SETTLE_DELAY;
if (ifctx->gotrootpath)
printf(" (got root path)");
}
printf("\n");
}
} /* while secs */
#ifdef BOOTP_TIMEOUT
if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
break;
#endif
/* Force a retry if halfway in DHCP negotiation */
retry = 0;
STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
if (ifctx->state == IF_DHCP_OFFERED) {
if (ifctx->dhcpquerytype == DHCP_DISCOVER)
retry = 1;
else
ifctx->state = IF_DHCP_UNRESOLVED;
}
if (retry != 0)
continue;
if (gotrootpath != 0) {
gctx->gotrootpath = gotrootpath;
if (rtimo != 0 && time_second >= rtimo)
break;
}
} /* forever send/receive */
/*
* XXX: These are errors of varying seriousness being silently
* ignored
*/
STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
if (bootpc_ifctx_isresolved(ifctx) == 0) {
printf("%s timeout for interface %s\n",
ifctx->dhcpquerytype != DHCP_NOMSG ?
"DHCP" : "BOOTP",
ifctx->ireq.ifr_name);
}
if (gctx->gotrootpath != 0) {
#if 0
printf("Got a root path, ignoring remaining timeout\n");
#endif
error = 0;
goto out;
}
#ifndef BOOTP_NFSROOT
STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
if (bootpc_ifctx_isresolved(ifctx) != 0) {
error = 0;
goto out;
}
#endif
error = ETIMEDOUT;
out:
return (error);
}
static void
bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, struct thread *td)
{
struct ifreq *ifr;
struct in_aliasreq *ifra;
struct sockaddr_in *sin;
int error;
ifr = &ifctx->ireq;
ifra = &ifctx->iareq;
/*
* Bring up the interface.
*
* Get the old interface flags and or IFF_UP into them; if
* IFF_UP set blindly, interface selection can be clobbered.
*/
error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td);
if (error != 0)
panic("%s: SIOCGIFFLAGS, error=%d", __func__, error);
ifr->ifr_flags |= IFF_UP;
error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td);
if (error != 0)
panic("%s: SIOCSIFFLAGS, error=%d", __func__, error);
/*
* Do enough of ifconfig(8) so that the chosen interface
* can talk to the servers. Set address to 0.0.0.0/8 and
* broadcast address to local broadcast.
*/
sin = (struct sockaddr_in *)&ifra->ifra_addr;
clear_sinaddr(sin);
sin = (struct sockaddr_in *)&ifra->ifra_mask;
clear_sinaddr(sin);
sin->sin_addr.s_addr = htonl(0xff000000);
sin = (struct sockaddr_in *)&ifra->ifra_broadaddr;
clear_sinaddr(sin);
sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td);
if (error != 0)
panic("%s: SIOCAIFADDR, error=%d", __func__, error);
}
static void
bootpc_shutdown_interface(struct bootpc_ifcontext *ifctx, struct thread *td)
{
struct ifreq *ifr;
struct sockaddr_in *sin;
int error;
ifr = &ifctx->ireq;
printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td);
if (error != 0)
panic("%s: SIOCGIFFLAGS, error=%d", __func__, error);
ifr->ifr_flags &= ~IFF_UP;
error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td);
if (error != 0)
panic("%s: SIOCSIFFLAGS, error=%d", __func__, error);
sin = (struct sockaddr_in *) &ifr->ifr_addr;
clear_sinaddr(sin);
error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td);
if (error != 0)
panic("%s: SIOCDIFADDR, error=%d", __func__, error);
}
static void
bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
struct bootpc_globalcontext *gctx, struct thread *td)
{
int error;
struct sockaddr_in *sin;
struct ifreq *ifr;
struct in_aliasreq *ifra;
struct sockaddr_in *myaddr;
struct sockaddr_in *netmask;
ifr = &ifctx->ireq;
ifra = &ifctx->iareq;
myaddr = &ifctx->myaddr;
netmask = &ifctx->netmask;
if (bootpc_ifctx_isresolved(ifctx) == 0) {
/* Shutdown interfaces where BOOTP failed */
bootpc_shutdown_interface(ifctx, td);
return;
}
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)
*/
sin = (struct sockaddr_in *) &ifr->ifr_addr;
clear_sinaddr(sin);
error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td);
if (error != 0)
panic("%s: SIOCDIFADDR, error=%d", __func__, error);
bcopy(myaddr, &ifra->ifra_addr, sizeof(*myaddr));
bcopy(netmask, &ifra->ifra_mask, sizeof(*netmask));
clear_sinaddr(&ifra->ifra_broadaddr);
ifra->ifra_broadaddr.sin_addr.s_addr = myaddr->sin_addr.s_addr |
~netmask->sin_addr.s_addr;
error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td);
if (error != 0)
panic("%s: SIOCAIFADDR, error=%d", __func__, error);
}
static void
bootpc_add_default_route(struct bootpc_ifcontext *ifctx)
{
int error;
struct sockaddr_in defdst;
struct sockaddr_in defmask;
struct rt_addrinfo info;
struct rib_cmd_info rc;
if (ifctx->gw.sin_addr.s_addr == htonl(INADDR_ANY))
return;
clear_sinaddr(&defdst);
clear_sinaddr(&defmask);
bzero((caddr_t)&info, sizeof(info));
info.rti_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
info.rti_info[RTAX_DST] = (struct sockaddr *)&defdst;
info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&defmask;
info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ifctx->gw;
error = rib_action(RT_DEFAULT_FIB, RTM_ADD, &info, &rc);
if (error != 0) {
printf("%s: RTM_ADD, error=%d\n", __func__, error);
}
}
static void
bootpc_remove_default_route(struct bootpc_ifcontext *ifctx)
{
int error;
struct sockaddr_in defdst;
struct sockaddr_in defmask;
struct rt_addrinfo info;
struct rib_cmd_info rc;
if (ifctx->gw.sin_addr.s_addr == htonl(INADDR_ANY))
return;
clear_sinaddr(&defdst);
clear_sinaddr(&defmask);
bzero((caddr_t)&info, sizeof(info));
info.rti_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
info.rti_info[RTAX_DST] = (struct sockaddr *)&defdst;
info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&defmask;
info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ifctx->gw;
error = rib_action(RT_DEFAULT_FIB, RTM_DELETE, &info, &rc);
if (error != 0) {
printf("%s: RTM_DELETE, error=%d\n", __func__, error);
}
}
static int
setfs(struct sockaddr_in *addr, char *path, char *p,
const struct in_addr *siaddr)
{
if (getip(&p, &addr->sin_addr) == 0) {
if (siaddr != NULL && *p == '/')
bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr));
else
return 0;
} else {
if (*p != ':')
return 0;
p++;
}
addr->sin_len = sizeof(struct sockaddr_in);
addr->sin_family = AF_INET;
strlcpy(path, p, MNAMELEN);
return 1;
}
static int
getip(char **ptr, struct in_addr *addr)
{
char *p;
unsigned int ip;
int val;
p = *ptr;
ip = 0;
if (((val = getdec(&p)) < 0) || (val > 255))
return 0;
ip = val << 24;
if (*p != '.')
return 0;
p++;
if (((val = getdec(&p)) < 0) || (val > 255))
return 0;
ip |= (val << 16);
if (*p != '.')
return 0;
p++;
if (((val = getdec(&p)) < 0) || (val > 255))
return 0;
ip |= (val << 8);
if (*p != '.')
return 0;
p++;
if (((val = getdec(&p)) < 0) || (val > 255))
return 0;
ip |= val;
addr->s_addr = htonl(ip);
*ptr = p;
return 1;
}
static int
getdec(char **ptr)
{
char *p;
int ret;
p = *ptr;
ret = 0;
if ((*p < '0') || (*p > '9'))
return -1;
while ((*p >= '0') && (*p <= '9')) {
ret = ret * 10 + (*p - '0');
p++;
}
*ptr = p;
return ret;
}
static void
mountopts(struct nfs_args *args, char *p)
{
args->version = NFS_ARGSVERSION;
args->rsize = BOOTP_BLOCKSIZE;
args->wsize = BOOTP_BLOCKSIZE;
args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
args->sotype = SOCK_DGRAM;
if (p != NULL)
nfs_parse_options(p, args);
}
static int
xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
{
struct mbuf *m;
int alignedlen;
m = *mptr;
alignedlen = ( len + 3 ) & ~3;
if (m->m_len < alignedlen) {
m = m_pullup(m, alignedlen);
if (m == NULL) {
*mptr = NULL;
return EBADRPC;
}
}
bcopy(mtod(m, u_char *), buf, len);
m_adj(m, alignedlen);
*mptr = m;
return 0;
}
static int
xdr_int_decode(struct mbuf **mptr, int *iptr)
{
u_int32_t i;
if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
return EBADRPC;
*iptr = fxdr_unsigned(u_int32_t, i);
return 0;
}
static void
print_sin_addr(struct sockaddr_in *sin)
{
print_in_addr(sin->sin_addr);
}
static void
print_in_addr(struct in_addr addr)
{
unsigned int ip;
ip = ntohl(addr.s_addr);
printf("%d.%d.%d.%d",
ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
}
static void
bootpc_compose_query(struct bootpc_ifcontext *ifctx, struct thread *td)
{
unsigned char *vendp;
unsigned char vendor_client[64];
uint32_t leasetime;
uint8_t vendor_client_len;
ifctx->gotrootpath = 0;
bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
/* bootpc part */
ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */
ifctx->call.htype = 1; /* 10mb ethernet */
ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
ifctx->call.hops = 0;
if (bootpc_ifctx_isunresolved(ifctx) != 0)
ifctx->xid++;
ifctx->call.xid = txdr_unsigned(ifctx->xid);
bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
vendp = ifctx->call.vend;
*vendp++ = 99; /* RFC1048 cookie */
*vendp++ = 130;
*vendp++ = 83;
*vendp++ = 99;
*vendp++ = TAG_MAXMSGSIZE;
*vendp++ = 2;
*vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
*vendp++ = sizeof(struct bootp_packet) & 255;
snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
ostype, MACHINE, osrelease);
vendor_client_len = strlen(vendor_client);
*vendp++ = TAG_VENDOR_INDENTIFIER;
*vendp++ = vendor_client_len;
memcpy(vendp, vendor_client, vendor_client_len);
vendp += vendor_client_len;
ifctx->dhcpquerytype = DHCP_NOMSG;
switch (ifctx->state) {
case IF_DHCP_UNRESOLVED:
*vendp++ = TAG_DHCP_MSGTYPE;
*vendp++ = 1;
*vendp++ = DHCP_DISCOVER;
ifctx->dhcpquerytype = DHCP_DISCOVER;
ifctx->gotdhcpserver = 0;
break;
case IF_DHCP_OFFERED:
*vendp++ = TAG_DHCP_MSGTYPE;
*vendp++ = 1;
*vendp++ = DHCP_REQUEST;
ifctx->dhcpquerytype = DHCP_REQUEST;
*vendp++ = TAG_DHCP_REQ_ADDR;
*vendp++ = 4;
memcpy(vendp, &ifctx->reply.yiaddr, 4);
vendp += 4;
if (ifctx->gotdhcpserver != 0) {
*vendp++ = TAG_DHCP_SERVERID;
*vendp++ = 4;
memcpy(vendp, &ifctx->dhcpserver, 4);
vendp += 4;
}
*vendp++ = TAG_DHCP_LEASETIME;
*vendp++ = 4;
leasetime = htonl(300);
memcpy(vendp, &leasetime, 4);
vendp += 4;
break;
default:
break;
}
*vendp = TAG_END;
ifctx->call.secs = 0;
ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */
}
static int
bootpc_hascookie(struct bootp_packet *bp)
{
return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
bp->vend[2] == 83 && bp->vend[3] == 99);
}
static void
bootpc_tag_helper(struct bootpc_tagcontext *tctx,
unsigned char *start, int len, int tag)
{
unsigned char *j;
unsigned char *ej;
unsigned char code;
if (tctx->badtag != 0 || tctx->badopt != 0)
return;
j = start;
ej = j + len;
while (j < ej) {
code = *j++;
if (code == TAG_PAD)
continue;
if (code == TAG_END)
return;
if (j >= ej || j + *j + 1 > ej) {
tctx->badopt = 1;
return;
}
len = *j++;
if (code == tag) {
if (tctx->taglen + len > TAG_MAXLEN) {
tctx->badtag = 1;
return;
}
tctx->foundopt = 1;
if (len > 0)
memcpy(tctx->buf + tctx->taglen,
j, len);
tctx->taglen += len;
}
if (code == TAG_OVERLOAD)
tctx->overload = *j;
j += len;
}
}
static unsigned char *
bootpc_tag(struct bootpc_tagcontext *tctx,
struct bootp_packet *bp, int len, int tag)
{
tctx->overload = 0;
tctx->badopt = 0;
tctx->badtag = 0;
tctx->foundopt = 0;
tctx->taglen = 0;
if (bootpc_hascookie(bp) == 0)
return NULL;
bootpc_tag_helper(tctx, &bp->vend[4],
(unsigned char *) bp + len - &bp->vend[4], tag);
if ((tctx->overload & OVERLOAD_FILE) != 0)
bootpc_tag_helper(tctx,
(unsigned char *) bp->file,
sizeof(bp->file),
tag);
if ((tctx->overload & OVERLOAD_SNAME) != 0)
bootpc_tag_helper(tctx,
(unsigned char *) bp->sname,
sizeof(bp->sname),
tag);
if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
return NULL;
tctx->buf[tctx->taglen] = '\0';
return tctx->buf;
}
static void
bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
struct bootpc_globalcontext *gctx)
{
char *p, *s;
ifctx->gotgw = 0;
ifctx->gotnetmask = 0;
clear_sinaddr(&ifctx->myaddr);
clear_sinaddr(&ifctx->netmask);
clear_sinaddr(&ifctx->gw);
ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
printf("%s at ", ifctx->ireq.ifr_name);
print_sin_addr(&ifctx->myaddr);
printf(" server ");
print_in_addr(ifctx->reply.siaddr);
ifctx->gw.sin_addr = ifctx->reply.giaddr;
if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
printf(" via gateway ");
print_in_addr(ifctx->reply.giaddr);
}
/* This call used for the side effect (overload flag) */
(void) bootpc_tag(&gctx->tmptag,
&ifctx->reply, ifctx->replylen, TAG_END);
if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
if (ifctx->reply.sname[0] != '\0')
printf(" server name %s", ifctx->reply.sname);
if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
if (ifctx->reply.file[0] != '\0')
printf(" boot file %s", ifctx->reply.file);
printf("\n");
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
TAG_SUBNETMASK);
if (p != NULL) {
if (gctx->tag.taglen != 4)
panic("bootpc: subnet mask len is %d",
gctx->tag.taglen);
bcopy(p, &ifctx->netmask.sin_addr, 4);
ifctx->gotnetmask = 1;
printf("subnet mask ");
print_sin_addr(&ifctx->netmask);
printf(" ");
}
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
TAG_ROUTERS);
if (p != NULL) {
/* Routers */
if (gctx->tag.taglen % 4)
panic("bootpc: Router Len is %d", gctx->tag.taglen);
if (gctx->tag.taglen > 0) {
bcopy(p, &ifctx->gw.sin_addr, 4);
printf("router ");
print_sin_addr(&ifctx->gw);
printf(" ");
ifctx->gotgw = 1;
gctx->gotgw = 1;
}
}
/*
* Choose a root filesystem. If a value is forced in the environment
* and it contains "nfs:", use it unconditionally. Otherwise, if the
* kernel is compiled with the ROOTDEVNAME option, then use it if:
* - The server doesn't provide a pathname.
* - The boothowto flags include RB_DFLTROOT (user said to override
* the server value).
*/
p = NULL;
if ((s = kern_getenv("vfs.root.mountfrom")) != NULL) {
if ((p = strstr(s, "nfs:")) != NULL)
p = strdup(p + 4, M_TEMP);
freeenv(s);
}
if (p == NULL) {
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
TAG_ROOT);
if (p != NULL)
ifctx->gotrootpath = 1;
}
#ifdef ROOTDEVNAME
if ((p == NULL || (boothowto & RB_DFLTROOT) != 0) &&
(p = strstr(ROOTDEVNAME, "nfs:")) != NULL) {
p += 4;
}
#endif
if (p != NULL) {
if (gctx->setrootfs != NULL) {
printf("rootfs %s (ignored) ", p);
} else if (setfs(&nd->root_saddr,
nd->root_hostnam, p, &ifctx->reply.siaddr)) {
if (*p == '/') {
printf("root_server ");
print_sin_addr(&nd->root_saddr);
printf(" ");
}
printf("rootfs %s ", p);
gctx->gotrootpath = 1;
gctx->setrootfs = ifctx;
p = bootpc_tag(&gctx->tag, &ifctx->reply,
ifctx->replylen,
TAG_ROOTOPTS);
if (p != NULL) {
mountopts(&nd->root_args, p);
printf("rootopts %s ", p);
}
} else
panic("Failed to set rootfs to %s", p);
}
p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
TAG_HOSTNAME);
if (p != NULL) {
if (gctx->tag.taglen >= MAXHOSTNAMELEN)
panic("bootpc: hostname >= %d bytes",
MAXHOSTNAMELEN);
if (gctx->sethostname != NULL) {
printf("hostname %s (ignored) ", p);
} else {
strcpy(nd->my_hostnam, p);
mtx_lock(&prison0.pr_mtx);
strcpy(prison0.pr_hostname, p);
mtx_unlock(&prison0.pr_mtx);
printf("hostname %s ", p);
gctx->sethostname = 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);
}
printf("\n");
if (ifctx->gotnetmask == 0) {
/*
* If there is no netmask, use historical default,
* but we really need the right mask from the server.
*/
printf("%s: no netmask received!\n", ifctx->ireq.ifr_name);
if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
else
ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
}
}
void
bootpc_init(void)
{
struct bootpc_ifcontext *ifctx = NULL; /* Interface BOOTP contexts */
struct bootpc_globalcontext *gctx; /* Global BOOTP context */
struct ifnet *ifp;
struct sockaddr_dl *sdl;
struct ifaddr *ifa;
int error;
#ifndef BOOTP_WIRED_TO
int ifcnt;
#endif
struct nfsv3_diskless *nd;
struct thread *td;
int timeout;
int delay;
char *s;
timeout = BOOTP_IFACE_WAIT_TIMEOUT * hz;
delay = hz / 10;
nd = &nfsv3_diskless;
td = curthread;
/*
* If already filled in, don't touch it here
*/
if (nfs_diskless_valid != 0)
return;
/*
* If "vfs.root.mountfrom" is set and the value is something other
* than "nfs:", it means the user doesn't want to mount root via nfs,
* there's no reason to continue with bootpc
*/
if ((s = kern_getenv("vfs.root.mountfrom")) != NULL) {
if ((strncmp(s, "nfs:", 4)) != 0) {
printf("%s: vfs.root.mountfrom set to %s. "
"BOOTP aborted.\n", __func__, s);
freeenv(s);
return;
}
freeenv(s);
}
gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
STAILQ_INIT(&gctx->interfaces);
gctx->xid = ~0xFFFF;
gctx->starttime = time_second;
/*
* If ROOTDEVNAME is defined or vfs.root.mountfrom is set then we have
* root-path overrides that can potentially let us boot even if we don't
* get a root path from the server, so we can treat that as a non-error.
*/
#ifdef ROOTDEVNAME
gctx->any_root_overrides = 1;
#else
gctx->any_root_overrides = testenv("vfs.root.mountfrom");
#endif
/*
* Find a network interface.
*/
CURVNET_SET(TD_TO_VNET(td));
#ifdef BOOTP_WIRED_TO
printf("%s: wired to interface '%s'\n", __func__,
__XSTRING(BOOTP_WIRED_TO));
allocifctx(gctx);
#else
/*
* Preallocate interface context storage, if another interface
* attaches and wins the race, it won't be eligible for bootp.
*/
ifcnt = 0;
IFNET_RLOCK();
CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
if ((ifp->if_flags &
(IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
IFF_BROADCAST)
continue;
switch (ifp->if_alloctype) {
case IFT_ETHER:
break;
default:
continue;
}
ifcnt++;
}
IFNET_RUNLOCK();
if (ifcnt == 0) {
printf("WARNING: BOOTP found no eligible network interfaces, skipping!\n");
goto out;
}
for (; ifcnt > 0; ifcnt--)
allocifctx(gctx);
#endif
retry:
ifctx = STAILQ_FIRST(&gctx->interfaces);
IFNET_RLOCK();
CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
if (ifctx == NULL)
break;
#ifdef BOOTP_WIRED_TO
if (strcmp(ifp->if_xname, __XSTRING(BOOTP_WIRED_TO)) != 0)
continue;
#else
if ((ifp->if_flags &
(IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
IFF_BROADCAST)
continue;
switch (ifp->if_alloctype) {
case IFT_ETHER:
break;
default:
continue;
}
#endif
strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
sizeof(ifctx->ireq.ifr_name));
ifctx->ifp = ifp;
/* Get HW address */
sdl = NULL;
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
if (ifa->ifa_addr->sa_family == AF_LINK) {
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
if (sdl->sdl_type == IFT_ETHER)
break;
}
if (sdl == NULL)
panic("bootpc: Unable to find HW address for %s",
ifctx->ireq.ifr_name);
ifctx->sdl = sdl;
ifctx = STAILQ_NEXT(ifctx, next);
}
IFNET_RUNLOCK();
CURVNET_RESTORE();
if (STAILQ_EMPTY(&gctx->interfaces) ||
STAILQ_FIRST(&gctx->interfaces)->ifp == NULL) {
if (timeout > 0) {
pause("bootpc", delay);
timeout -= delay;
goto retry;
}
#ifdef BOOTP_WIRED_TO
panic("%s: Could not find interface specified "
"by BOOTP_WIRED_TO: "
__XSTRING(BOOTP_WIRED_TO), __func__);
#else
panic("%s: no suitable interface", __func__);
#endif
}
error = socreate(AF_INET, &bootp_so, SOCK_DGRAM, 0, td->td_ucred, td);
if (error != 0)
panic("%s: socreate, error=%d", __func__, error);
STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
bootpc_fakeup_interface(ifctx, td);
STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
bootpc_compose_query(ifctx, td);
error = bootpc_call(gctx, td);
if (error != 0) {
printf("BOOTP call failed\n");
}
mountopts(&nd->root_args, NULL);
STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
if (bootpc_ifctx_isresolved(ifctx) != 0)
bootpc_decode_reply(nd, ifctx, gctx);
#ifdef BOOTP_NFSROOT
if (gctx->gotrootpath == 0 && gctx->any_root_overrides == 0)
panic("bootpc: No root path offered");
#endif
STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
bootpc_adjust_interface(ifctx, gctx, td);
soclose(bootp_so);
STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
if (ifctx->gotrootpath != 0)
break;
if (ifctx == NULL) {
STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
if (bootpc_ifctx_isresolved(ifctx) != 0)
break;
}
if (ifctx == NULL)
goto out;
if (gctx->gotrootpath != 0) {
struct epoch_tracker et;
kern_setenv("boot.netif.name", ifctx->ifp->if_xname);
NET_EPOCH_ENTER(et);
bootpc_add_default_route(ifctx);
NET_EPOCH_EXIT(et);
error = md_mount(&nd->root_saddr, nd->root_hostnam,
nd->root_fh, &nd->root_fhsize,
&nd->root_args, td);
NET_EPOCH_ENTER(et);
bootpc_remove_default_route(ifctx);
NET_EPOCH_EXIT(et);
if (error != 0) {
if (gctx->any_root_overrides == 0)
panic("nfs_boot: mount root, error=%d", error);
else
goto out;
}
rootdevnames[0] = "nfs:";
nfs_diskless_valid = 3;
}
strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
ifctx->myaddr.sin_addr.s_addr |
~ ifctx->netmask.sin_addr.s_addr;
bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
bcopy(&ifctx->gw, &nd->mygateway, sizeof(ifctx->gw));
out:
while((ifctx = STAILQ_FIRST(&gctx->interfaces)) != NULL) {
STAILQ_REMOVE_HEAD(&gctx->interfaces, next);
free(ifctx, M_TEMP);
}
free(gctx, M_TEMP);
}
/*
* RPC: mountd/mount
* Given a server pathname, get an NFS file handle.
* Also, sets sin->sin_port to the NFS service port.
*/
static int
md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep,
struct nfs_args *args, struct thread *td)
{
struct mbuf *m;
int error;
int authunixok;
int authcount;
int authver;
#define RPCPROG_MNT 100005
#define RPCMNT_VER1 1
#define RPCMNT_VER3 3
#define RPCMNT_MOUNT 1
#define AUTH_SYS 1 /* unix style (uid, gids) */
#define AUTH_UNIX AUTH_SYS
/* XXX honor v2/v3 flags in args->flags? */
#ifdef BOOTP_NFSV3
/* First try NFS v3 */
/* Get port number for MOUNTD. */
error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
&mdsin->sin_port, td);
if (error == 0) {
m = xdr_string_encode(path, strlen(path));
/* Do RPC to mountd. */
error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
RPCMNT_MOUNT, &m, NULL, td);
}
if (error == 0) {
args->flags |= NFSMNT_NFSV3;
} else {
#endif
/* Fallback to NFS v2 */
/* Get port number for MOUNTD. */
error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
&mdsin->sin_port, td);
if (error != 0)
return error;
m = xdr_string_encode(path, strlen(path));
/* Do RPC to mountd. */
error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
RPCMNT_MOUNT, &m, NULL, td);
if (error != 0)
return error; /* message already freed */
#ifdef BOOTP_NFSV3
}
#endif
if (xdr_int_decode(&m, &error) != 0 || error != 0)
goto bad;
if ((args->flags & NFSMNT_NFSV3) != 0) {
if (xdr_int_decode(&m, fhsizep) != 0 ||
*fhsizep > NFSX_V3FHMAX ||
*fhsizep <= 0)
goto bad;
} else
*fhsizep = NFSX_V2FH;
if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
goto bad;
if (args->flags & NFSMNT_NFSV3) {
if (xdr_int_decode(&m, &authcount) != 0)
goto bad;
authunixok = 0;
if (authcount < 0 || authcount > 100)
goto bad;
while (authcount > 0) {
if (xdr_int_decode(&m, &authver) != 0)
goto bad;
if (authver == AUTH_UNIX)
authunixok = 1;
authcount--;
}
if (authunixok == 0)
goto bad;
}
/* Set port number for NFS use. */
error = krpc_portmap(mdsin, NFS_PROG,
(args->flags &
NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
&mdsin->sin_port, td);
goto out;
bad:
error = EBADRPC;
out:
m_freem(m);
return error;
}
SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);
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