xref: /freebsd/sys/nfs/bootp_subr.c (revision 3e11bd9e2a2b1cbd4283c87c93e3cc75e3f2dacb)
1 /*-
2  * Copyright (c) 1995 Gordon Ross, Adam Glass
3  * Copyright (c) 1992 Regents of the University of California.
4  * All rights reserved.
5  *
6  * This software was developed by the Computer Systems Engineering group
7  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
8  * contributed to Berkeley.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *	This product includes software developed by the University of
21  *	California, Lawrence Berkeley Laboratory and its contributors.
22  * 4. Neither the name of the University nor the names of its contributors
23  *    may be used to endorse or promote products derived from this software
24  *    without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36  * SUCH DAMAGE.
37  *
38  * based on:
39  *      nfs/krpc_subr.c
40  *	$NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
41  */
42 
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45 
46 #include "opt_bootp.h"
47 #include "opt_nfs.h"
48 #include "opt_rootdevname.h"
49 
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/jail.h>
53 #include <sys/kernel.h>
54 #include <sys/sockio.h>
55 #include <sys/malloc.h>
56 #include <sys/mount.h>
57 #include <sys/mbuf.h>
58 #include <sys/proc.h>
59 #include <sys/reboot.h>
60 #include <sys/socket.h>
61 #include <sys/socketvar.h>
62 #include <sys/sysctl.h>
63 #include <sys/uio.h>
64 
65 #include <net/if.h>
66 #include <net/if_var.h>
67 #include <net/route.h>
68 
69 #include <netinet/in.h>
70 #include <netinet/in_var.h>
71 #include <net/if_types.h>
72 #include <net/if_dl.h>
73 #include <net/vnet.h>
74 
75 #include <nfs/nfsproto.h>
76 #include <nfsclient/nfs.h>
77 #include <nfs/nfsdiskless.h>
78 #include <nfs/krpc.h>
79 #include <nfs/xdr_subs.h>
80 
81 
82 #define BOOTP_MIN_LEN		300	/* Minimum size of bootp udp packet */
83 
84 #ifndef BOOTP_SETTLE_DELAY
85 #define BOOTP_SETTLE_DELAY 3
86 #endif
87 
88 /*
89  * Wait 10 seconds for interface appearance
90  * USB ethernet adapters might require some time to pop up
91  */
92 #ifndef	BOOTP_IFACE_WAIT_TIMEOUT
93 #define	BOOTP_IFACE_WAIT_TIMEOUT	10
94 #endif
95 
96 /*
97  * What is the longest we will wait before re-sending a request?
98  * Note this is also the frequency of "RPC timeout" messages.
99  * The re-send loop count sup linearly to this maximum, so the
100  * first complaint will happen after (1+2+3+4+5)=15 seconds.
101  */
102 #define	MAX_RESEND_DELAY 5	/* seconds */
103 
104 /* Definitions from RFC951 */
105 struct bootp_packet {
106 	u_int8_t op;
107 	u_int8_t htype;
108 	u_int8_t hlen;
109 	u_int8_t hops;
110 	u_int32_t xid;
111 	u_int16_t secs;
112 	u_int16_t flags;
113 	struct in_addr ciaddr;
114 	struct in_addr yiaddr;
115 	struct in_addr siaddr;
116 	struct in_addr giaddr;
117 	unsigned char chaddr[16];
118 	char sname[64];
119 	char file[128];
120 	unsigned char vend[1222];
121 };
122 
123 struct bootpc_ifcontext {
124 	STAILQ_ENTRY(bootpc_ifcontext) next;
125 	struct bootp_packet call;
126 	struct bootp_packet reply;
127 	int replylen;
128 	int overload;
129 	union {
130 		struct ifreq _ifreq;
131 		struct in_aliasreq _in_alias_req;
132 	} _req;
133 #define	ireq	_req._ifreq
134 #define	iareq	_req._in_alias_req
135 	struct ifnet *ifp;
136 	struct sockaddr_dl *sdl;
137 	struct sockaddr_in myaddr;
138 	struct sockaddr_in netmask;
139 	struct sockaddr_in gw;
140 	int gotgw;
141 	int gotnetmask;
142 	int gotrootpath;
143 	int outstanding;
144 	int sentmsg;
145 	u_int32_t xid;
146 	enum {
147 		IF_BOOTP_UNRESOLVED,
148 		IF_BOOTP_RESOLVED,
149 		IF_BOOTP_FAILED,
150 		IF_DHCP_UNRESOLVED,
151 		IF_DHCP_OFFERED,
152 		IF_DHCP_RESOLVED,
153 		IF_DHCP_FAILED,
154 	} state;
155 	int dhcpquerytype;		/* dhcp type sent */
156 	struct in_addr dhcpserver;
157 	int gotdhcpserver;
158 };
159 
160 #define TAG_MAXLEN 1024
161 struct bootpc_tagcontext {
162 	char buf[TAG_MAXLEN + 1];
163 	int overload;
164 	int badopt;
165 	int badtag;
166 	int foundopt;
167 	int taglen;
168 };
169 
170 struct bootpc_globalcontext {
171 	STAILQ_HEAD(, bootpc_ifcontext) interfaces;
172 	u_int32_t xid;
173 	int any_root_overrides;
174 	int gotrootpath;
175 	int gotgw;
176 	int ifnum;
177 	int secs;
178 	int starttime;
179 	struct bootp_packet reply;
180 	int replylen;
181 	struct bootpc_ifcontext *setrootfs;
182 	struct bootpc_ifcontext *sethostname;
183 	struct bootpc_tagcontext tmptag;
184 	struct bootpc_tagcontext tag;
185 };
186 
187 #define IPPORT_BOOTPC 68
188 #define IPPORT_BOOTPS 67
189 
190 #define BOOTP_REQUEST 1
191 #define BOOTP_REPLY 2
192 
193 /* Common tags */
194 #define TAG_PAD		  0  /* Pad option, implicit length 1 */
195 #define TAG_SUBNETMASK	  1  /* RFC 950 subnet mask */
196 #define TAG_ROUTERS	  3  /* Routers (in order of preference) */
197 #define TAG_HOSTNAME	 12  /* Client host name */
198 #define TAG_ROOT	 17  /* Root path */
199 
200 /* DHCP specific tags */
201 #define TAG_OVERLOAD	 52  /* Option Overload */
202 #define TAG_MAXMSGSIZE   57  /* Maximum DHCP Message Size */
203 
204 #define TAG_END		255  /* End Option (i.e. no more options) */
205 
206 /* Overload values */
207 #define OVERLOAD_FILE     1
208 #define OVERLOAD_SNAME    2
209 
210 /* Site specific tags: */
211 #define TAG_ROOTOPTS	130
212 #define TAG_COOKIE	134	/* ascii info for userland, via sysctl */
213 
214 #define TAG_DHCP_MSGTYPE 53
215 #define TAG_DHCP_REQ_ADDR 50
216 #define TAG_DHCP_SERVERID 54
217 #define TAG_DHCP_LEASETIME 51
218 
219 #define TAG_VENDOR_INDENTIFIER 60
220 
221 #define DHCP_NOMSG    0
222 #define DHCP_DISCOVER 1
223 #define DHCP_OFFER    2
224 #define DHCP_REQUEST  3
225 #define DHCP_ACK      5
226 
227 /* NFS read/write block size */
228 #ifndef BOOTP_BLOCKSIZE
229 #define	BOOTP_BLOCKSIZE	8192
230 #endif
231 
232 static char bootp_cookie[128];
233 static struct socket *bootp_so;
234 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
235 	bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
236 
237 /* mountd RPC */
238 static int	md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp,
239 		    int *fhsizep, struct nfs_args *args, struct thread *td);
240 static int	setfs(struct sockaddr_in *addr, char *path, char *p,
241 		    const struct in_addr *siaddr);
242 static int	getdec(char **ptr);
243 static int	getip(char **ptr, struct in_addr *ip);
244 static void	mountopts(struct nfs_args *args, char *p);
245 static int	xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
246 static int	xdr_int_decode(struct mbuf **ptr, int *iptr);
247 static void	print_in_addr(struct in_addr addr);
248 static void	print_sin_addr(struct sockaddr_in *addr);
249 static void	clear_sinaddr(struct sockaddr_in *sin);
250 static void	allocifctx(struct bootpc_globalcontext *gctx);
251 static void	bootpc_compose_query(struct bootpc_ifcontext *ifctx,
252 		    struct thread *td);
253 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
254 		    struct bootp_packet *bp, int len, int tag);
255 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
256 		    unsigned char *start, int len, int tag);
257 
258 #ifdef BOOTP_DEBUG
259 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma);
260 void bootpboot_p_rtentry(struct rtentry *rt);
261 void bootpboot_p_tree(struct radix_node *rn);
262 void bootpboot_p_rtlist(void);
263 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
264 void bootpboot_p_iflist(void);
265 #endif
266 
267 static int	bootpc_call(struct bootpc_globalcontext *gctx,
268 		    struct thread *td);
269 
270 static void	bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
271 		    struct thread *td);
272 
273 static int	bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
274 		    struct bootpc_globalcontext *gctx, struct thread *td);
275 
276 static void	bootpc_decode_reply(struct nfsv3_diskless *nd,
277 		    struct bootpc_ifcontext *ifctx,
278 		    struct bootpc_globalcontext *gctx);
279 
280 static int	bootpc_received(struct bootpc_globalcontext *gctx,
281 		    struct bootpc_ifcontext *ifctx);
282 
283 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
284 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
285 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
286 
287 /*
288  * In order to have multiple active interfaces with address 0.0.0.0
289  * and be able to send data to a selected interface, we first set
290  * mask to /8 on all interfaces, and temporarily set it to /0 when
291  * doing sosend().
292  */
293 
294 #ifdef BOOTP_DEBUG
295 void
296 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
297 {
298 
299 	if (sa == NULL) {
300 		printf("(sockaddr *) <null>");
301 		return;
302 	}
303 	switch (sa->sa_family) {
304 	case AF_INET:
305 	{
306 		struct sockaddr_in *sin;
307 
308 		sin = (struct sockaddr_in *) sa;
309 		printf("inet ");
310 		print_sin_addr(sin);
311 		if (ma != NULL) {
312 			sin = (struct sockaddr_in *) ma;
313 			printf(" mask ");
314 			print_sin_addr(sin);
315 		}
316 	}
317 	break;
318 	case AF_LINK:
319 	{
320 		struct sockaddr_dl *sli;
321 		int i;
322 
323 		sli = (struct sockaddr_dl *) sa;
324 		printf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
325 		for (i = 0; i < sli->sdl_alen; i++) {
326 			if (i > 0)
327 				printf(":");
328 			printf("%x", ((unsigned char *) LLADDR(sli))[i]);
329 		}
330 	}
331 	break;
332 	default:
333 		printf("af%d", sa->sa_family);
334 	}
335 }
336 
337 void
338 bootpboot_p_rtentry(struct rtentry *rt)
339 {
340 
341 	bootpboot_p_sa(rt_key(rt), rt_mask(rt));
342 	printf(" ");
343 	bootpboot_p_sa(rt->rt_gateway, NULL);
344 	printf(" ");
345 	printf("flags %x", (unsigned short) rt->rt_flags);
346 	printf(" %d", (int) rt->rt_expire);
347 	printf(" %s\n", rt->rt_ifp->if_xname);
348 }
349 
350 void
351 bootpboot_p_tree(struct radix_node *rn)
352 {
353 
354 	while (rn != NULL) {
355 		if (rn->rn_bit < 0) {
356 			if ((rn->rn_flags & RNF_ROOT) != 0) {
357 			} else {
358 				bootpboot_p_rtentry((struct rtentry *) rn);
359 			}
360 			rn = rn->rn_dupedkey;
361 		} else {
362 			bootpboot_p_tree(rn->rn_left);
363 			bootpboot_p_tree(rn->rn_right);
364 			return;
365 		}
366 	}
367 }
368 
369 void
370 bootpboot_p_rtlist(void)
371 {
372 	struct radix_node_head *rnh;
373 
374 	printf("Routing table:\n");
375 	rnh = rt_tables_get_rnh(0, AF_INET);
376 	if (rnh == NULL)
377 		return;
378 	RADIX_NODE_HEAD_RLOCK(rnh);	/* could sleep XXX */
379 	bootpboot_p_tree(rnh->rnh_treetop);
380 	RADIX_NODE_HEAD_RUNLOCK(rnh);
381 }
382 
383 void
384 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
385 {
386 
387 	printf("%s flags %x, addr ",
388 	       ifp->if_xname, ifp->if_flags);
389 	print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
390 	printf(", broadcast ");
391 	print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
392 	printf(", netmask ");
393 	print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
394 	printf("\n");
395 }
396 
397 void
398 bootpboot_p_iflist(void)
399 {
400 	struct ifnet *ifp;
401 	struct ifaddr *ifa;
402 
403 	printf("Interface list:\n");
404 	IFNET_RLOCK();
405 	for (ifp = TAILQ_FIRST(&V_ifnet);
406 	     ifp != NULL;
407 	     ifp = TAILQ_NEXT(ifp, if_link)) {
408 		for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
409 		     ifa != NULL;
410 		     ifa = TAILQ_NEXT(ifa, ifa_link))
411 			if (ifa->ifa_addr->sa_family == AF_INET)
412 				bootpboot_p_if(ifp, ifa);
413 	}
414 	IFNET_RUNLOCK();
415 }
416 #endif /* defined(BOOTP_DEBUG) */
417 
418 static void
419 clear_sinaddr(struct sockaddr_in *sin)
420 {
421 
422 	bzero(sin, sizeof(*sin));
423 	sin->sin_len = sizeof(*sin);
424 	sin->sin_family = AF_INET;
425 	sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
426 	sin->sin_port = 0;
427 }
428 
429 static void
430 allocifctx(struct bootpc_globalcontext *gctx)
431 {
432 	struct bootpc_ifcontext *ifctx;
433 
434 	ifctx = malloc(sizeof(*ifctx), M_TEMP, M_WAITOK | M_ZERO);
435 	ifctx->xid = gctx->xid;
436 #ifdef BOOTP_NO_DHCP
437 	ifctx->state = IF_BOOTP_UNRESOLVED;
438 #else
439 	ifctx->state = IF_DHCP_UNRESOLVED;
440 #endif
441 	gctx->xid += 0x100;
442 	STAILQ_INSERT_TAIL(&gctx->interfaces, ifctx, next);
443 }
444 
445 static __inline int
446 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
447 {
448 
449 	if (ifctx->state == IF_BOOTP_RESOLVED ||
450 	    ifctx->state == IF_DHCP_RESOLVED)
451 		return 1;
452 	return 0;
453 }
454 
455 static __inline int
456 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
457 {
458 
459 	if (ifctx->state == IF_BOOTP_UNRESOLVED ||
460 	    ifctx->state == IF_DHCP_UNRESOLVED)
461 		return 1;
462 	return 0;
463 }
464 
465 static __inline int
466 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
467 {
468 
469 	if (ifctx->state == IF_BOOTP_FAILED ||
470 	    ifctx->state == IF_DHCP_FAILED)
471 		return 1;
472 	return 0;
473 }
474 
475 static int
476 bootpc_received(struct bootpc_globalcontext *gctx,
477     struct bootpc_ifcontext *ifctx)
478 {
479 	unsigned char dhcpreplytype;
480 	char *p;
481 
482 	/*
483 	 * Need timeout for fallback to less
484 	 * desirable alternative.
485 	 */
486 
487 	/* This call used for the side effect (badopt flag) */
488 	(void) bootpc_tag(&gctx->tmptag, &gctx->reply,
489 			  gctx->replylen,
490 			  TAG_END);
491 
492 	/* If packet is invalid, ignore it */
493 	if (gctx->tmptag.badopt != 0)
494 		return 0;
495 
496 	p = bootpc_tag(&gctx->tmptag, &gctx->reply,
497 		       gctx->replylen, TAG_DHCP_MSGTYPE);
498 	if (p != NULL)
499 		dhcpreplytype = *p;
500 	else
501 		dhcpreplytype = DHCP_NOMSG;
502 
503 	switch (ifctx->dhcpquerytype) {
504 	case DHCP_DISCOVER:
505 		if (dhcpreplytype != DHCP_OFFER 	/* Normal DHCP offer */
506 #ifndef BOOTP_FORCE_DHCP
507 		    && dhcpreplytype != DHCP_NOMSG	/* Fallback to BOOTP */
508 #endif
509 			)
510 			return 0;
511 		break;
512 	case DHCP_REQUEST:
513 		if (dhcpreplytype != DHCP_ACK)
514 			return 0;
515 	case DHCP_NOMSG:
516 		break;
517 	}
518 
519 	/* Ignore packet unless it gives us a root tag we didn't have */
520 
521 	if ((ifctx->state == IF_BOOTP_RESOLVED ||
522 	     (ifctx->dhcpquerytype == DHCP_DISCOVER &&
523 	      (ifctx->state == IF_DHCP_OFFERED ||
524 	       ifctx->state == IF_DHCP_RESOLVED))) &&
525 	    (bootpc_tag(&gctx->tmptag, &ifctx->reply,
526 			ifctx->replylen,
527 			TAG_ROOT) != NULL ||
528 	     bootpc_tag(&gctx->tmptag, &gctx->reply,
529 			gctx->replylen,
530 			TAG_ROOT) == NULL))
531 		return 0;
532 
533 	bcopy(&gctx->reply, &ifctx->reply, gctx->replylen);
534 	ifctx->replylen = gctx->replylen;
535 
536 	/* XXX: Only reset if 'perfect' response */
537 	if (ifctx->state == IF_BOOTP_UNRESOLVED)
538 		ifctx->state = IF_BOOTP_RESOLVED;
539 	else if (ifctx->state == IF_DHCP_UNRESOLVED &&
540 		 ifctx->dhcpquerytype == DHCP_DISCOVER) {
541 		if (dhcpreplytype == DHCP_OFFER)
542 			ifctx->state = IF_DHCP_OFFERED;
543 		else
544 			ifctx->state = IF_BOOTP_RESOLVED;	/* Fallback */
545 	} else if (ifctx->state == IF_DHCP_OFFERED &&
546 		   ifctx->dhcpquerytype == DHCP_REQUEST)
547 		ifctx->state = IF_DHCP_RESOLVED;
548 
549 
550 	if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
551 	    ifctx->state != IF_BOOTP_RESOLVED) {
552 		p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
553 			       ifctx->replylen, TAG_DHCP_SERVERID);
554 		if (p != NULL && gctx->tmptag.taglen == 4) {
555 			memcpy(&ifctx->dhcpserver, p, 4);
556 			ifctx->gotdhcpserver = 1;
557 		} else
558 			ifctx->gotdhcpserver = 0;
559 		return 1;
560 	}
561 
562 	ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
563 					 ifctx->replylen,
564 					 TAG_ROOT) != NULL);
565 	ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
566 				   ifctx->replylen,
567 				   TAG_ROUTERS) != NULL);
568 	ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
569 					ifctx->replylen,
570 					TAG_SUBNETMASK) != NULL);
571 	return 1;
572 }
573 
574 static int
575 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
576 {
577 	struct sockaddr_in *sin, dst;
578 	struct uio auio;
579 	struct sockopt sopt;
580 	struct iovec aio;
581 	int error, on, rcvflg, timo, len;
582 	time_t atimo;
583 	time_t rtimo;
584 	struct timeval tv;
585 	struct bootpc_ifcontext *ifctx;
586 	int outstanding;
587 	int gotrootpath;
588 	int retry;
589 	const char *s;
590 
591 	tv.tv_sec = 1;
592 	tv.tv_usec = 0;
593 	bzero(&sopt, sizeof(sopt));
594 	sopt.sopt_dir = SOPT_SET;
595 	sopt.sopt_level = SOL_SOCKET;
596 	sopt.sopt_name = SO_RCVTIMEO;
597 	sopt.sopt_val = &tv;
598 	sopt.sopt_valsize = sizeof tv;
599 
600 	error = sosetopt(bootp_so, &sopt);
601 	if (error != 0)
602 		goto out;
603 
604 	/*
605 	 * Enable broadcast.
606 	 */
607 	on = 1;
608 	sopt.sopt_name = SO_BROADCAST;
609 	sopt.sopt_val = &on;
610 	sopt.sopt_valsize = sizeof on;
611 
612 	error = sosetopt(bootp_so, &sopt);
613 	if (error != 0)
614 		goto out;
615 
616 	/*
617 	 * Disable routing.
618 	 */
619 
620 	on = 1;
621 	sopt.sopt_name = SO_DONTROUTE;
622 	sopt.sopt_val = &on;
623 	sopt.sopt_valsize = sizeof on;
624 
625 	error = sosetopt(bootp_so, &sopt);
626 	if (error != 0)
627 		goto out;
628 
629 	/*
630 	 * Bind the local endpoint to a bootp client port.
631 	 */
632 	sin = &dst;
633 	clear_sinaddr(sin);
634 	sin->sin_port = htons(IPPORT_BOOTPC);
635 	error = sobind(bootp_so, (struct sockaddr *)sin, td);
636 	if (error != 0) {
637 		printf("bind failed\n");
638 		goto out;
639 	}
640 
641 	/*
642 	 * Setup socket address for the server.
643 	 */
644 	sin = &dst;
645 	clear_sinaddr(sin);
646 	sin->sin_addr.s_addr = INADDR_BROADCAST;
647 	sin->sin_port = htons(IPPORT_BOOTPS);
648 
649 	/*
650 	 * Send it, repeatedly, until a reply is received,
651 	 * but delay each re-send by an increasing amount.
652 	 * If the delay hits the maximum, start complaining.
653 	 */
654 	timo = 0;
655 	rtimo = 0;
656 	for (;;) {
657 
658 		outstanding = 0;
659 		gotrootpath = 0;
660 
661 		STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
662 			if (bootpc_ifctx_isresolved(ifctx) != 0 &&
663 			    bootpc_tag(&gctx->tmptag, &ifctx->reply,
664 				       ifctx->replylen,
665 				       TAG_ROOT) != NULL)
666 				gotrootpath = 1;
667 		}
668 
669 		STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
670 			struct in_aliasreq *ifra = &ifctx->iareq;
671 			sin = (struct sockaddr_in *)&ifra->ifra_mask;
672 
673 			ifctx->outstanding = 0;
674 			if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
675 			    gotrootpath != 0) {
676 				continue;
677 			}
678 			if (bootpc_ifctx_isfailed(ifctx) != 0)
679 				continue;
680 
681 			outstanding++;
682 			ifctx->outstanding = 1;
683 
684 			/* Proceed to next step in DHCP negotiation */
685 			if ((ifctx->state == IF_DHCP_OFFERED &&
686 			     ifctx->dhcpquerytype != DHCP_REQUEST) ||
687 			    (ifctx->state == IF_DHCP_UNRESOLVED &&
688 			     ifctx->dhcpquerytype != DHCP_DISCOVER) ||
689 			    (ifctx->state == IF_BOOTP_UNRESOLVED &&
690 			     ifctx->dhcpquerytype != DHCP_NOMSG)) {
691 				ifctx->sentmsg = 0;
692 				bootpc_compose_query(ifctx, td);
693 			}
694 
695 			/* Send BOOTP request (or re-send). */
696 
697 			if (ifctx->sentmsg == 0) {
698 				switch(ifctx->dhcpquerytype) {
699 				case DHCP_DISCOVER:
700 					s = "DHCP Discover";
701 					break;
702 				case DHCP_REQUEST:
703 					s = "DHCP Request";
704 					break;
705 				case DHCP_NOMSG:
706 				default:
707 					s = "BOOTP Query";
708 					break;
709 				}
710 				printf("Sending %s packet from "
711 				       "interface %s (%*D)\n",
712 				       s,
713 				       ifctx->ireq.ifr_name,
714 				       ifctx->sdl->sdl_alen,
715 				       (unsigned char *) LLADDR(ifctx->sdl),
716 				       ":");
717 				ifctx->sentmsg = 1;
718 			}
719 
720 			aio.iov_base = (caddr_t) &ifctx->call;
721 			aio.iov_len = sizeof(ifctx->call);
722 
723 			auio.uio_iov = &aio;
724 			auio.uio_iovcnt = 1;
725 			auio.uio_segflg = UIO_SYSSPACE;
726 			auio.uio_rw = UIO_WRITE;
727 			auio.uio_offset = 0;
728 			auio.uio_resid = sizeof(ifctx->call);
729 			auio.uio_td = td;
730 
731 			/* Set netmask to 0.0.0.0 */
732 			clear_sinaddr(sin);
733 			error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra,
734 			    td);
735 			if (error != 0)
736 				panic("%s: SIOCAIFADDR, error=%d", __func__,
737 				    error);
738 
739 			error = sosend(bootp_so, (struct sockaddr *) &dst,
740 				       &auio, NULL, NULL, 0, td);
741 			if (error != 0)
742 				printf("%s: sosend: %d state %08x\n", __func__,
743 				    error, (int )bootp_so->so_state);
744 
745 			/* Set netmask to 255.0.0.0 */
746 			sin->sin_addr.s_addr = htonl(IN_CLASSA_NET);
747 			error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra,
748 			    td);
749 			if (error != 0)
750 				panic("%s: SIOCAIFADDR, error=%d", __func__,
751 				    error);
752 		}
753 
754 		if (outstanding == 0 &&
755 		    (rtimo == 0 || time_second >= rtimo)) {
756 			error = 0;
757 			goto out;
758 		}
759 
760 		/* Determine new timeout. */
761 		if (timo < MAX_RESEND_DELAY)
762 			timo++;
763 		else {
764 			printf("DHCP/BOOTP timeout for server ");
765 			print_sin_addr(&dst);
766 			printf("\n");
767 		}
768 
769 		/*
770 		 * Wait for up to timo seconds for a reply.
771 		 * The socket receive timeout was set to 1 second.
772 		 */
773 		atimo = timo + time_second;
774 		while (time_second < atimo) {
775 			aio.iov_base = (caddr_t) &gctx->reply;
776 			aio.iov_len = sizeof(gctx->reply);
777 
778 			auio.uio_iov = &aio;
779 			auio.uio_iovcnt = 1;
780 			auio.uio_segflg = UIO_SYSSPACE;
781 			auio.uio_rw = UIO_READ;
782 			auio.uio_offset = 0;
783 			auio.uio_resid = sizeof(gctx->reply);
784 			auio.uio_td = td;
785 
786 			rcvflg = 0;
787 			error = soreceive(bootp_so, NULL, &auio,
788 					  NULL, NULL, &rcvflg);
789 			gctx->secs = time_second - gctx->starttime;
790 			STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
791 				if (bootpc_ifctx_isresolved(ifctx) != 0 ||
792 				    bootpc_ifctx_isfailed(ifctx) != 0)
793 					continue;
794 
795 				ifctx->call.secs = htons(gctx->secs);
796 			}
797 			if (error == EWOULDBLOCK)
798 				continue;
799 			if (error != 0)
800 				goto out;
801 			len = sizeof(gctx->reply) - auio.uio_resid;
802 
803 			/* Do we have the required number of bytes ? */
804 			if (len < BOOTP_MIN_LEN)
805 				continue;
806 			gctx->replylen = len;
807 
808 			/* Is it a reply? */
809 			if (gctx->reply.op != BOOTP_REPLY)
810 				continue;
811 
812 			/* Is this an answer to our query */
813 			STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
814 				if (gctx->reply.xid != ifctx->call.xid)
815 					continue;
816 
817 				/* Same HW address size ? */
818 				if (gctx->reply.hlen != ifctx->call.hlen)
819 					continue;
820 
821 				/* Correct HW address ? */
822 				if (bcmp(gctx->reply.chaddr,
823 					 ifctx->call.chaddr,
824 					 ifctx->call.hlen) != 0)
825 					continue;
826 
827 				break;
828 			}
829 
830 			if (ifctx != NULL) {
831 				s =  bootpc_tag(&gctx->tmptag,
832 						&gctx->reply,
833 						gctx->replylen,
834 						TAG_DHCP_MSGTYPE);
835 				if (s != NULL) {
836 					switch (*s) {
837 					case DHCP_OFFER:
838 						s = "DHCP Offer";
839 						break;
840 					case DHCP_ACK:
841 						s = "DHCP Ack";
842 						break;
843 					default:
844 						s = "DHCP (unexpected)";
845 						break;
846 					}
847 				} else
848 					s = "BOOTP Reply";
849 
850 				printf("Received %s packet"
851 				       " on %s from ",
852 				       s,
853 				       ifctx->ireq.ifr_name);
854 				print_in_addr(gctx->reply.siaddr);
855 				if (gctx->reply.giaddr.s_addr !=
856 				    htonl(INADDR_ANY)) {
857 					printf(" via ");
858 					print_in_addr(gctx->reply.giaddr);
859 				}
860 				if (bootpc_received(gctx, ifctx) != 0) {
861 					printf(" (accepted)");
862 					if (ifctx->outstanding) {
863 						ifctx->outstanding = 0;
864 						outstanding--;
865 					}
866 					/* Network settle delay */
867 					if (outstanding == 0)
868 						atimo = time_second +
869 							BOOTP_SETTLE_DELAY;
870 				} else
871 					printf(" (ignored)");
872 				if (ifctx->gotrootpath ||
873 				    gctx->any_root_overrides) {
874 					gotrootpath = 1;
875 					rtimo = time_second +
876 						BOOTP_SETTLE_DELAY;
877 					if (ifctx->gotrootpath)
878 						printf(" (got root path)");
879 				}
880 				printf("\n");
881 			}
882 		} /* while secs */
883 #ifdef BOOTP_TIMEOUT
884 		if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
885 			break;
886 #endif
887 		/* Force a retry if halfway in DHCP negotiation */
888 		retry = 0;
889 		STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
890 			if (ifctx->state == IF_DHCP_OFFERED) {
891 				if (ifctx->dhcpquerytype == DHCP_DISCOVER)
892 					retry = 1;
893 				else
894 					ifctx->state = IF_DHCP_UNRESOLVED;
895 			}
896 
897 		if (retry != 0)
898 			continue;
899 
900 		if (gotrootpath != 0) {
901 			gctx->gotrootpath = gotrootpath;
902 			if (rtimo != 0 && time_second >= rtimo)
903 				break;
904 		}
905 	} /* forever send/receive */
906 
907 	/*
908 	 * XXX: These are errors of varying seriousness being silently
909 	 * ignored
910 	 */
911 
912 	STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
913 		if (bootpc_ifctx_isresolved(ifctx) == 0) {
914 			printf("%s timeout for interface %s\n",
915 			       ifctx->dhcpquerytype != DHCP_NOMSG ?
916 			       "DHCP" : "BOOTP",
917 			       ifctx->ireq.ifr_name);
918 		}
919 
920 	if (gctx->gotrootpath != 0) {
921 #if 0
922 		printf("Got a root path, ignoring remaining timeout\n");
923 #endif
924 		error = 0;
925 		goto out;
926 	}
927 #ifndef BOOTP_NFSROOT
928 	STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
929 		if (bootpc_ifctx_isresolved(ifctx) != 0) {
930 			error = 0;
931 			goto out;
932 		}
933 #endif
934 	error = ETIMEDOUT;
935 
936 out:
937 	return (error);
938 }
939 
940 static void
941 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, struct thread *td)
942 {
943 	struct ifreq *ifr;
944 	struct in_aliasreq *ifra;
945 	struct sockaddr_in *sin;
946 	int error;
947 
948 	ifr = &ifctx->ireq;
949 	ifra = &ifctx->iareq;
950 
951 	/*
952 	 * Bring up the interface.
953 	 *
954 	 * Get the old interface flags and or IFF_UP into them; if
955 	 * IFF_UP set blindly, interface selection can be clobbered.
956 	 */
957 	error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td);
958 	if (error != 0)
959 		panic("%s: SIOCGIFFLAGS, error=%d", __func__, error);
960 	ifr->ifr_flags |= IFF_UP;
961 	error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td);
962 	if (error != 0)
963 		panic("%s: SIOCSIFFLAGS, error=%d", __func__, error);
964 
965 	/*
966 	 * Do enough of ifconfig(8) so that the chosen interface
967 	 * can talk to the servers. Set address to 0.0.0.0/8 and
968 	 * broadcast address to local broadcast.
969 	 */
970 	sin = (struct sockaddr_in *)&ifra->ifra_addr;
971 	clear_sinaddr(sin);
972 	sin = (struct sockaddr_in *)&ifra->ifra_mask;
973 	clear_sinaddr(sin);
974 	sin->sin_addr.s_addr = htonl(IN_CLASSA_NET);
975 	sin = (struct sockaddr_in *)&ifra->ifra_broadaddr;
976 	clear_sinaddr(sin);
977 	sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
978 	error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td);
979 	if (error != 0)
980 		panic("%s: SIOCAIFADDR, error=%d", __func__, error);
981 }
982 
983 static void
984 bootpc_shutdown_interface(struct bootpc_ifcontext *ifctx, struct thread *td)
985 {
986 	struct ifreq *ifr;
987 	struct sockaddr_in *sin;
988 	int error;
989 
990 	ifr = &ifctx->ireq;
991 
992 	printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
993 	error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td);
994 	if (error != 0)
995 		panic("%s: SIOCGIFFLAGS, error=%d", __func__, error);
996 	ifr->ifr_flags &= ~IFF_UP;
997 	error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td);
998 	if (error != 0)
999 		panic("%s: SIOCSIFFLAGS, error=%d", __func__, error);
1000 
1001 	sin = (struct sockaddr_in *) &ifr->ifr_addr;
1002 	clear_sinaddr(sin);
1003 	error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td);
1004 	if (error != 0)
1005 		panic("%s: SIOCDIFADDR, error=%d", __func__, error);
1006 }
1007 
1008 static int
1009 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1010     struct bootpc_globalcontext *gctx, struct thread *td)
1011 {
1012 	int error;
1013 	struct sockaddr_in defdst;
1014 	struct sockaddr_in defmask;
1015 	struct sockaddr_in *sin;
1016 	struct ifreq *ifr;
1017 	struct in_aliasreq *ifra;
1018 	struct sockaddr_in *myaddr;
1019 	struct sockaddr_in *netmask;
1020 	struct sockaddr_in *gw;
1021 
1022 	ifr = &ifctx->ireq;
1023 	ifra = &ifctx->iareq;
1024 	myaddr = &ifctx->myaddr;
1025 	netmask = &ifctx->netmask;
1026 	gw = &ifctx->gw;
1027 
1028 	if (bootpc_ifctx_isresolved(ifctx) == 0) {
1029 		/* Shutdown interfaces where BOOTP failed */
1030 		bootpc_shutdown_interface(ifctx, td);
1031 		return (0);
1032 	}
1033 
1034 	printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1035 	/*
1036 	 * Do enough of ifconfig(8) so that the chosen interface
1037 	 * can talk to the servers.  (just set the address)
1038 	 */
1039 	sin = (struct sockaddr_in *) &ifr->ifr_addr;
1040 	clear_sinaddr(sin);
1041 	error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td);
1042 	if (error != 0)
1043 		panic("%s: SIOCDIFADDR, error=%d", __func__, error);
1044 
1045 	bcopy(myaddr, &ifra->ifra_addr, sizeof(*myaddr));
1046 	bcopy(netmask, &ifra->ifra_mask, sizeof(*netmask));
1047 	clear_sinaddr(&ifra->ifra_broadaddr);
1048 	ifra->ifra_broadaddr.sin_addr.s_addr = myaddr->sin_addr.s_addr |
1049 	    ~netmask->sin_addr.s_addr;
1050 
1051 	error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td);
1052 	if (error != 0)
1053 		panic("%s: SIOCAIFADDR, error=%d", __func__, error);
1054 
1055 	/* Add new default route */
1056 
1057 	if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1058 		clear_sinaddr(&defdst);
1059 		clear_sinaddr(&defmask);
1060 		/* XXX MRT just table 0 */
1061 		error = rtrequest_fib(RTM_ADD,
1062 		    (struct sockaddr *) &defdst, (struct sockaddr *) gw,
1063 		    (struct sockaddr *) &defmask,
1064 		    (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, RT_DEFAULT_FIB);
1065 		if (error != 0) {
1066 			printf("%s: RTM_ADD, error=%d\n", __func__, error);
1067 			return (error);
1068 		}
1069 	}
1070 
1071 	return (0);
1072 }
1073 
1074 static int
1075 setfs(struct sockaddr_in *addr, char *path, char *p,
1076     const struct in_addr *siaddr)
1077 {
1078 
1079 	if (getip(&p, &addr->sin_addr) == 0) {
1080 		if (siaddr != NULL && *p == '/')
1081 			bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr));
1082 		else
1083 			return 0;
1084 	} else {
1085 		if (*p != ':')
1086 			return 0;
1087 		p++;
1088 	}
1089 
1090 	addr->sin_len = sizeof(struct sockaddr_in);
1091 	addr->sin_family = AF_INET;
1092 
1093 	strlcpy(path, p, MNAMELEN);
1094 	return 1;
1095 }
1096 
1097 static int
1098 getip(char **ptr, struct in_addr *addr)
1099 {
1100 	char *p;
1101 	unsigned int ip;
1102 	int val;
1103 
1104 	p = *ptr;
1105 	ip = 0;
1106 	if (((val = getdec(&p)) < 0) || (val > 255))
1107 		return 0;
1108 	ip = val << 24;
1109 	if (*p != '.')
1110 		return 0;
1111 	p++;
1112 	if (((val = getdec(&p)) < 0) || (val > 255))
1113 		return 0;
1114 	ip |= (val << 16);
1115 	if (*p != '.')
1116 		return 0;
1117 	p++;
1118 	if (((val = getdec(&p)) < 0) || (val > 255))
1119 		return 0;
1120 	ip |= (val << 8);
1121 	if (*p != '.')
1122 		return 0;
1123 	p++;
1124 	if (((val = getdec(&p)) < 0) || (val > 255))
1125 		return 0;
1126 	ip |= val;
1127 
1128 	addr->s_addr = htonl(ip);
1129 	*ptr = p;
1130 	return 1;
1131 }
1132 
1133 static int
1134 getdec(char **ptr)
1135 {
1136 	char *p;
1137 	int ret;
1138 
1139 	p = *ptr;
1140 	ret = 0;
1141 	if ((*p < '0') || (*p > '9'))
1142 		return -1;
1143 	while ((*p >= '0') && (*p <= '9')) {
1144 		ret = ret * 10 + (*p - '0');
1145 		p++;
1146 	}
1147 	*ptr = p;
1148 	return ret;
1149 }
1150 
1151 static void
1152 mountopts(struct nfs_args *args, char *p)
1153 {
1154 	args->version = NFS_ARGSVERSION;
1155 	args->rsize = BOOTP_BLOCKSIZE;
1156 	args->wsize = BOOTP_BLOCKSIZE;
1157 	args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
1158 	args->sotype = SOCK_DGRAM;
1159 	if (p != NULL)
1160 		nfs_parse_options(p, args);
1161 }
1162 
1163 static int
1164 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
1165 {
1166 	struct mbuf *m;
1167 	int alignedlen;
1168 
1169 	m = *mptr;
1170 	alignedlen = ( len + 3 ) & ~3;
1171 
1172 	if (m->m_len < alignedlen) {
1173 		m = m_pullup(m, alignedlen);
1174 		if (m == NULL) {
1175 			*mptr = NULL;
1176 			return EBADRPC;
1177 		}
1178 	}
1179 	bcopy(mtod(m, u_char *), buf, len);
1180 	m_adj(m, alignedlen);
1181 	*mptr = m;
1182 	return 0;
1183 }
1184 
1185 static int
1186 xdr_int_decode(struct mbuf **mptr, int *iptr)
1187 {
1188 	u_int32_t i;
1189 
1190 	if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
1191 		return EBADRPC;
1192 	*iptr = fxdr_unsigned(u_int32_t, i);
1193 	return 0;
1194 }
1195 
1196 static void
1197 print_sin_addr(struct sockaddr_in *sin)
1198 {
1199 
1200 	print_in_addr(sin->sin_addr);
1201 }
1202 
1203 static void
1204 print_in_addr(struct in_addr addr)
1205 {
1206 	unsigned int ip;
1207 
1208 	ip = ntohl(addr.s_addr);
1209 	printf("%d.%d.%d.%d",
1210 	       ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1211 }
1212 
1213 static void
1214 bootpc_compose_query(struct bootpc_ifcontext *ifctx, struct thread *td)
1215 {
1216 	unsigned char *vendp;
1217 	unsigned char vendor_client[64];
1218 	uint32_t leasetime;
1219 	uint8_t vendor_client_len;
1220 
1221 	ifctx->gotrootpath = 0;
1222 
1223 	bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1224 
1225 	/* bootpc part */
1226 	ifctx->call.op = BOOTP_REQUEST; 	/* BOOTREQUEST */
1227 	ifctx->call.htype = 1;			/* 10mb ethernet */
1228 	ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1229 	ifctx->call.hops = 0;
1230 	if (bootpc_ifctx_isunresolved(ifctx) != 0)
1231 		ifctx->xid++;
1232 	ifctx->call.xid = txdr_unsigned(ifctx->xid);
1233 	bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1234 
1235 	vendp = ifctx->call.vend;
1236 	*vendp++ = 99;		/* RFC1048 cookie */
1237 	*vendp++ = 130;
1238 	*vendp++ = 83;
1239 	*vendp++ = 99;
1240 	*vendp++ = TAG_MAXMSGSIZE;
1241 	*vendp++ = 2;
1242 	*vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1243 	*vendp++ = sizeof(struct bootp_packet) & 255;
1244 
1245 	snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1246 		ostype, MACHINE, osrelease);
1247 	vendor_client_len = strlen(vendor_client);
1248 	*vendp++ = TAG_VENDOR_INDENTIFIER;
1249 	*vendp++ = vendor_client_len;
1250 	memcpy(vendp, vendor_client, vendor_client_len);
1251 	vendp += vendor_client_len;
1252 	ifctx->dhcpquerytype = DHCP_NOMSG;
1253 	switch (ifctx->state) {
1254 	case IF_DHCP_UNRESOLVED:
1255 		*vendp++ = TAG_DHCP_MSGTYPE;
1256 		*vendp++ = 1;
1257 		*vendp++ = DHCP_DISCOVER;
1258 		ifctx->dhcpquerytype = DHCP_DISCOVER;
1259 		ifctx->gotdhcpserver = 0;
1260 		break;
1261 	case IF_DHCP_OFFERED:
1262 		*vendp++ = TAG_DHCP_MSGTYPE;
1263 		*vendp++ = 1;
1264 		*vendp++ = DHCP_REQUEST;
1265 		ifctx->dhcpquerytype = DHCP_REQUEST;
1266 		*vendp++ = TAG_DHCP_REQ_ADDR;
1267 		*vendp++ = 4;
1268 		memcpy(vendp, &ifctx->reply.yiaddr, 4);
1269 		vendp += 4;
1270 		if (ifctx->gotdhcpserver != 0) {
1271 			*vendp++ = TAG_DHCP_SERVERID;
1272 			*vendp++ = 4;
1273 			memcpy(vendp, &ifctx->dhcpserver, 4);
1274 			vendp += 4;
1275 		}
1276 		*vendp++ = TAG_DHCP_LEASETIME;
1277 		*vendp++ = 4;
1278 		leasetime = htonl(300);
1279 		memcpy(vendp, &leasetime, 4);
1280 		vendp += 4;
1281 		break;
1282 	default:
1283 		break;
1284 	}
1285 	*vendp = TAG_END;
1286 
1287 	ifctx->call.secs = 0;
1288 	ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */
1289 }
1290 
1291 static int
1292 bootpc_hascookie(struct bootp_packet *bp)
1293 {
1294 
1295 	return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1296 		bp->vend[2] == 83 && bp->vend[3] == 99);
1297 }
1298 
1299 static void
1300 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1301     unsigned char *start, int len, int tag)
1302 {
1303 	unsigned char *j;
1304 	unsigned char *ej;
1305 	unsigned char code;
1306 
1307 	if (tctx->badtag != 0 || tctx->badopt != 0)
1308 		return;
1309 
1310 	j = start;
1311 	ej = j + len;
1312 
1313 	while (j < ej) {
1314 		code = *j++;
1315 		if (code == TAG_PAD)
1316 			continue;
1317 		if (code == TAG_END)
1318 			return;
1319 		if (j >= ej || j + *j + 1 > ej) {
1320 			tctx->badopt = 1;
1321 			return;
1322 		}
1323 		len = *j++;
1324 		if (code == tag) {
1325 			if (tctx->taglen + len > TAG_MAXLEN) {
1326 				tctx->badtag = 1;
1327 				return;
1328 			}
1329 			tctx->foundopt = 1;
1330 			if (len > 0)
1331 				memcpy(tctx->buf + tctx->taglen,
1332 				       j, len);
1333 			tctx->taglen += len;
1334 		}
1335 		if (code == TAG_OVERLOAD)
1336 			tctx->overload = *j;
1337 
1338 		j += len;
1339 	}
1340 }
1341 
1342 static unsigned char *
1343 bootpc_tag(struct bootpc_tagcontext *tctx,
1344     struct bootp_packet *bp, int len, int tag)
1345 {
1346 	tctx->overload = 0;
1347 	tctx->badopt = 0;
1348 	tctx->badtag = 0;
1349 	tctx->foundopt = 0;
1350 	tctx->taglen = 0;
1351 
1352 	if (bootpc_hascookie(bp) == 0)
1353 		return NULL;
1354 
1355 	bootpc_tag_helper(tctx, &bp->vend[4],
1356 			  (unsigned char *) bp + len - &bp->vend[4], tag);
1357 
1358 	if ((tctx->overload & OVERLOAD_FILE) != 0)
1359 		bootpc_tag_helper(tctx,
1360 				  (unsigned char *) bp->file,
1361 				  sizeof(bp->file),
1362 				  tag);
1363 	if ((tctx->overload & OVERLOAD_SNAME) != 0)
1364 		bootpc_tag_helper(tctx,
1365 				  (unsigned char *) bp->sname,
1366 				  sizeof(bp->sname),
1367 				  tag);
1368 
1369 	if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1370 		return NULL;
1371 	tctx->buf[tctx->taglen] = '\0';
1372 	return tctx->buf;
1373 }
1374 
1375 static void
1376 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1377     struct bootpc_globalcontext *gctx)
1378 {
1379 	char *p, *s;
1380 	unsigned int ip;
1381 
1382 	ifctx->gotgw = 0;
1383 	ifctx->gotnetmask = 0;
1384 
1385 	clear_sinaddr(&ifctx->myaddr);
1386 	clear_sinaddr(&ifctx->netmask);
1387 	clear_sinaddr(&ifctx->gw);
1388 
1389 	ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1390 
1391 	ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1392 
1393 	printf("%s at ", ifctx->ireq.ifr_name);
1394 	print_sin_addr(&ifctx->myaddr);
1395 	printf(" server ");
1396 	print_in_addr(ifctx->reply.siaddr);
1397 
1398 	ifctx->gw.sin_addr = ifctx->reply.giaddr;
1399 	if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1400 		printf(" via gateway ");
1401 		print_in_addr(ifctx->reply.giaddr);
1402 	}
1403 
1404 	/* This call used for the side effect (overload flag) */
1405 	(void) bootpc_tag(&gctx->tmptag,
1406 			  &ifctx->reply, ifctx->replylen, TAG_END);
1407 
1408 	if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1409 		if (ifctx->reply.sname[0] != '\0')
1410 			printf(" server name %s", ifctx->reply.sname);
1411 	if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1412 		if (ifctx->reply.file[0] != '\0')
1413 			printf(" boot file %s", ifctx->reply.file);
1414 
1415 	printf("\n");
1416 
1417 	p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1418 		       TAG_SUBNETMASK);
1419 	if (p != NULL) {
1420 		if (gctx->tag.taglen != 4)
1421 			panic("bootpc: subnet mask len is %d",
1422 			      gctx->tag.taglen);
1423 		bcopy(p, &ifctx->netmask.sin_addr, 4);
1424 		ifctx->gotnetmask = 1;
1425 		printf("subnet mask ");
1426 		print_sin_addr(&ifctx->netmask);
1427 		printf(" ");
1428 	}
1429 
1430 	p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1431 		       TAG_ROUTERS);
1432 	if (p != NULL) {
1433 		/* Routers */
1434 		if (gctx->tag.taglen % 4)
1435 			panic("bootpc: Router Len is %d", gctx->tag.taglen);
1436 		if (gctx->tag.taglen > 0) {
1437 			bcopy(p, &ifctx->gw.sin_addr, 4);
1438 			printf("router ");
1439 			print_sin_addr(&ifctx->gw);
1440 			printf(" ");
1441 			ifctx->gotgw = 1;
1442 			gctx->gotgw = 1;
1443 		}
1444 	}
1445 
1446 	/*
1447 	 * Choose a root filesystem.  If a value is forced in the environment
1448 	 * and it contains "nfs:", use it unconditionally.  Otherwise, if the
1449 	 * kernel is compiled with the ROOTDEVNAME option, then use it if:
1450 	 *  - The server doesn't provide a pathname.
1451 	 *  - The boothowto flags include RB_DFLTROOT (user said to override
1452 	 *    the server value).
1453 	 */
1454 	p = NULL;
1455 	if ((s = kern_getenv("vfs.root.mountfrom")) != NULL) {
1456 		if ((p = strstr(s, "nfs:")) != NULL)
1457 			p = strdup(p + 4, M_TEMP);
1458 		freeenv(s);
1459 	}
1460 	if (p == NULL) {
1461 		p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1462 		       TAG_ROOT);
1463 	}
1464 #ifdef ROOTDEVNAME
1465 	if ((p == NULL || (boothowto & RB_DFLTROOT) != 0) &&
1466 	    (p = strstr(ROOTDEVNAME, "nfs:")) != NULL) {
1467 		p += 4;
1468 	}
1469 #endif
1470 	if (p != NULL) {
1471 		if (gctx->setrootfs != NULL) {
1472 			printf("rootfs %s (ignored) ", p);
1473 		} else 	if (setfs(&nd->root_saddr,
1474 				  nd->root_hostnam, p, &ifctx->reply.siaddr)) {
1475 			if (*p == '/') {
1476 				printf("root_server ");
1477 				print_sin_addr(&nd->root_saddr);
1478 				printf(" ");
1479 			}
1480 			printf("rootfs %s ", p);
1481 			gctx->gotrootpath = 1;
1482 			ifctx->gotrootpath = 1;
1483 			gctx->setrootfs = ifctx;
1484 
1485 			p = bootpc_tag(&gctx->tag, &ifctx->reply,
1486 				       ifctx->replylen,
1487 				       TAG_ROOTOPTS);
1488 			if (p != NULL) {
1489 				mountopts(&nd->root_args, p);
1490 				printf("rootopts %s ", p);
1491 			}
1492 		} else
1493 			panic("Failed to set rootfs to %s", p);
1494 	}
1495 
1496 	p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1497 		       TAG_HOSTNAME);
1498 	if (p != NULL) {
1499 		if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1500 			panic("bootpc: hostname >= %d bytes",
1501 			      MAXHOSTNAMELEN);
1502 		if (gctx->sethostname != NULL) {
1503 			printf("hostname %s (ignored) ", p);
1504 		} else {
1505 			strcpy(nd->my_hostnam, p);
1506 			mtx_lock(&prison0.pr_mtx);
1507 			strcpy(prison0.pr_hostname, p);
1508 			mtx_unlock(&prison0.pr_mtx);
1509 			printf("hostname %s ", p);
1510 			gctx->sethostname = ifctx;
1511 		}
1512 	}
1513 	p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1514 			TAG_COOKIE);
1515 	if (p != NULL) {        /* store in a sysctl variable */
1516 		int i, l = sizeof(bootp_cookie) - 1;
1517 		for (i = 0; i < l && p[i] != '\0'; i++)
1518 			bootp_cookie[i] = p[i];
1519 		p[i] = '\0';
1520 	}
1521 
1522 
1523 	printf("\n");
1524 
1525 	if (ifctx->gotnetmask == 0) {
1526 		if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1527 			ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1528 		else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1529 			ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1530 		else
1531 			ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1532 	}
1533 	if (ifctx->gotgw == 0) {
1534 		/* Use proxyarp */
1535 		ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1536 	}
1537 }
1538 
1539 void
1540 bootpc_init(void)
1541 {
1542 	struct bootpc_ifcontext *ifctx;		/* Interface BOOTP contexts */
1543 	struct bootpc_globalcontext *gctx; 	/* Global BOOTP context */
1544 	struct ifnet *ifp;
1545 	struct sockaddr_dl *sdl;
1546 	struct ifaddr *ifa;
1547 	int error;
1548 #ifndef BOOTP_WIRED_TO
1549 	int ifcnt;
1550 #endif
1551 	struct nfsv3_diskless *nd;
1552 	struct thread *td;
1553 	int timeout;
1554 	int delay;
1555 
1556 	timeout = BOOTP_IFACE_WAIT_TIMEOUT * hz;
1557 	delay = hz / 10;
1558 
1559 	nd = &nfsv3_diskless;
1560 	td = curthread;
1561 
1562 	/*
1563 	 * If already filled in, don't touch it here
1564 	 */
1565 	if (nfs_diskless_valid != 0)
1566 		return;
1567 
1568 	gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1569 	STAILQ_INIT(&gctx->interfaces);
1570 	gctx->xid = ~0xFFFF;
1571 	gctx->starttime = time_second;
1572 
1573 	/*
1574 	 * If ROOTDEVNAME is defined or vfs.root.mountfrom is set then we have
1575 	 * root-path overrides that can potentially let us boot even if we don't
1576 	 * get a root path from the server, so we can treat that as a non-error.
1577 	 */
1578 #ifdef ROOTDEVNAME
1579 	gctx->any_root_overrides = 1;
1580 #else
1581 	gctx->any_root_overrides = testenv("vfs.root.mountfrom");
1582 #endif
1583 
1584 	/*
1585 	 * Find a network interface.
1586 	 */
1587 	CURVNET_SET(TD_TO_VNET(td));
1588 #ifdef BOOTP_WIRED_TO
1589 	printf("%s: wired to interface '%s'\n", __func__,
1590 	       __XSTRING(BOOTP_WIRED_TO));
1591 	allocifctx(gctx);
1592 #else
1593 	/*
1594 	 * Preallocate interface context storage, if another interface
1595 	 * attaches and wins the race, it won't be eligible for bootp.
1596 	 */
1597 	ifcnt = 0;
1598 	IFNET_RLOCK();
1599 	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1600 		if ((ifp->if_flags &
1601 		     (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1602 		    IFF_BROADCAST)
1603 			continue;
1604 		switch (ifp->if_alloctype) {
1605 			case IFT_ETHER:
1606 			case IFT_FDDI:
1607 			case IFT_ISO88025:
1608 				break;
1609 			default:
1610 				continue;
1611 		}
1612 		ifcnt++;
1613 	}
1614 	IFNET_RUNLOCK();
1615 	if (ifcnt == 0)
1616 		panic("%s: no eligible interfaces", __func__);
1617 	for (; ifcnt > 0; ifcnt--)
1618 		allocifctx(gctx);
1619 #endif
1620 
1621 retry:
1622 	ifctx = STAILQ_FIRST(&gctx->interfaces);
1623 	IFNET_RLOCK();
1624 	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1625 		if (ifctx == NULL)
1626 			break;
1627 #ifdef BOOTP_WIRED_TO
1628 		if (strcmp(ifp->if_xname, __XSTRING(BOOTP_WIRED_TO)) != 0)
1629 			continue;
1630 #else
1631 		if ((ifp->if_flags &
1632 		     (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1633 		    IFF_BROADCAST)
1634 			continue;
1635 		switch (ifp->if_alloctype) {
1636 			case IFT_ETHER:
1637 			case IFT_FDDI:
1638 			case IFT_ISO88025:
1639 				break;
1640 			default:
1641 				continue;
1642 		}
1643 #endif
1644 		strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1645 		    sizeof(ifctx->ireq.ifr_name));
1646 		ifctx->ifp = ifp;
1647 
1648 		/* Get HW address */
1649 		sdl = NULL;
1650 		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1651 			if (ifa->ifa_addr->sa_family == AF_LINK) {
1652 				sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1653 				if (sdl->sdl_type == IFT_ETHER)
1654 					break;
1655 			}
1656 		if (sdl == NULL)
1657 			panic("bootpc: Unable to find HW address for %s",
1658 			    ifctx->ireq.ifr_name);
1659 		ifctx->sdl = sdl;
1660 
1661 		ifctx = STAILQ_NEXT(ifctx, next);
1662 	}
1663 	IFNET_RUNLOCK();
1664 	CURVNET_RESTORE();
1665 
1666 	if (STAILQ_EMPTY(&gctx->interfaces) ||
1667 	    STAILQ_FIRST(&gctx->interfaces)->ifp == NULL) {
1668 		if (timeout > 0) {
1669 			pause("bootpc", delay);
1670 			timeout -= delay;
1671 			goto retry;
1672 		}
1673 #ifdef BOOTP_WIRED_TO
1674 		panic("%s: Could not find interface specified "
1675 		      "by BOOTP_WIRED_TO: "
1676 		      __XSTRING(BOOTP_WIRED_TO), __func__);
1677 #else
1678 		panic("%s: no suitable interface", __func__);
1679 #endif
1680 	}
1681 
1682 	error = socreate(AF_INET, &bootp_so, SOCK_DGRAM, 0, td->td_ucred, td);
1683 	if (error != 0)
1684 		panic("%s: socreate, error=%d", __func__, error);
1685 
1686 	STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1687 		bootpc_fakeup_interface(ifctx, td);
1688 
1689 	STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1690 		bootpc_compose_query(ifctx, td);
1691 
1692 	error = bootpc_call(gctx, td);
1693 	if (error != 0) {
1694 		printf("BOOTP call failed\n");
1695 	}
1696 
1697 	mountopts(&nd->root_args, NULL);
1698 
1699 	STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1700 		if (bootpc_ifctx_isresolved(ifctx) != 0)
1701 			bootpc_decode_reply(nd, ifctx, gctx);
1702 
1703 #ifdef BOOTP_NFSROOT
1704 	if (gctx->gotrootpath == 0 && gctx->any_root_overrides == 0)
1705 		panic("bootpc: No root path offered");
1706 #endif
1707 
1708 	STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1709 		bootpc_adjust_interface(ifctx, gctx, td);
1710 
1711 	soclose(bootp_so);
1712 
1713 	STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1714 		if (ifctx->gotrootpath != 0)
1715 			break;
1716 	if (ifctx == NULL) {
1717 		STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1718 			if (bootpc_ifctx_isresolved(ifctx) != 0)
1719 				break;
1720 	}
1721 	if (ifctx == NULL)
1722 		goto out;
1723 
1724 	if (gctx->gotrootpath != 0) {
1725 
1726 		kern_setenv("boot.netif.name", ifctx->ifp->if_xname);
1727 
1728 		error = md_mount(&nd->root_saddr, nd->root_hostnam,
1729 				 nd->root_fh, &nd->root_fhsize,
1730 				 &nd->root_args, td);
1731 		if (error != 0) {
1732 			if (gctx->any_root_overrides == 0)
1733 				panic("nfs_boot: mount root, error=%d", error);
1734 			else
1735 				goto out;
1736 		}
1737 		rootdevnames[0] = "nfs:";
1738 #ifdef NFSCLIENT
1739 		rootdevnames[1] = "oldnfs:";
1740 #endif
1741 		nfs_diskless_valid = 3;
1742 	}
1743 
1744 	strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1745 	bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1746 	bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1747 	((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1748 		ifctx->myaddr.sin_addr.s_addr |
1749 		~ ifctx->netmask.sin_addr.s_addr;
1750 	bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1751 
1752 out:
1753 	while((ifctx = STAILQ_FIRST(&gctx->interfaces)) != NULL) {
1754 		STAILQ_REMOVE_HEAD(&gctx->interfaces, next);
1755 		free(ifctx, M_TEMP);
1756 	}
1757 	free(gctx, M_TEMP);
1758 }
1759 
1760 /*
1761  * RPC: mountd/mount
1762  * Given a server pathname, get an NFS file handle.
1763  * Also, sets sin->sin_port to the NFS service port.
1764  */
1765 static int
1766 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep,
1767     struct nfs_args *args, struct thread *td)
1768 {
1769 	struct mbuf *m;
1770 	int error;
1771 	int authunixok;
1772 	int authcount;
1773 	int authver;
1774 
1775 #define	RPCPROG_MNT	100005
1776 #define	RPCMNT_VER1	1
1777 #define RPCMNT_VER3	3
1778 #define	RPCMNT_MOUNT	1
1779 #define	AUTH_SYS	1		/* unix style (uid, gids) */
1780 #define AUTH_UNIX	AUTH_SYS
1781 
1782 	/* XXX honor v2/v3 flags in args->flags? */
1783 #ifdef BOOTP_NFSV3
1784 	/* First try NFS v3 */
1785 	/* Get port number for MOUNTD. */
1786 	error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1787 			     &mdsin->sin_port, td);
1788 	if (error == 0) {
1789 		m = xdr_string_encode(path, strlen(path));
1790 
1791 		/* Do RPC to mountd. */
1792 		error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1793 				  RPCMNT_MOUNT, &m, NULL, td);
1794 	}
1795 	if (error == 0) {
1796 		args->flags |= NFSMNT_NFSV3;
1797 	} else {
1798 #endif
1799 		/* Fallback to NFS v2 */
1800 
1801 		/* Get port number for MOUNTD. */
1802 		error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1803 				     &mdsin->sin_port, td);
1804 		if (error != 0)
1805 			return error;
1806 
1807 		m = xdr_string_encode(path, strlen(path));
1808 
1809 		/* Do RPC to mountd. */
1810 		error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1811 				  RPCMNT_MOUNT, &m, NULL, td);
1812 		if (error != 0)
1813 			return error;	/* message already freed */
1814 
1815 #ifdef BOOTP_NFSV3
1816 	}
1817 #endif
1818 
1819 	if (xdr_int_decode(&m, &error) != 0 || error != 0)
1820 		goto bad;
1821 
1822 	if ((args->flags & NFSMNT_NFSV3) != 0) {
1823 		if (xdr_int_decode(&m, fhsizep) != 0 ||
1824 		    *fhsizep > NFSX_V3FHMAX ||
1825 		    *fhsizep <= 0)
1826 			goto bad;
1827 	} else
1828 		*fhsizep = NFSX_V2FH;
1829 
1830 	if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
1831 		goto bad;
1832 
1833 	if (args->flags & NFSMNT_NFSV3) {
1834 		if (xdr_int_decode(&m, &authcount) != 0)
1835 			goto bad;
1836 		authunixok = 0;
1837 		if (authcount < 0 || authcount > 100)
1838 			goto bad;
1839 		while (authcount > 0) {
1840 			if (xdr_int_decode(&m, &authver) != 0)
1841 				goto bad;
1842 			if (authver == AUTH_UNIX)
1843 				authunixok = 1;
1844 			authcount--;
1845 		}
1846 		if (authunixok == 0)
1847 			goto bad;
1848 	}
1849 
1850 	/* Set port number for NFS use. */
1851 	error = krpc_portmap(mdsin, NFS_PROG,
1852 			     (args->flags &
1853 			      NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
1854 			     &mdsin->sin_port, td);
1855 
1856 	goto out;
1857 
1858 bad:
1859 	error = EBADRPC;
1860 
1861 out:
1862 	m_freem(m);
1863 	return error;
1864 }
1865 
1866 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);
1867