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NFS - Fix numerous issues with NFS root mounts, primarily for vkernels
[dragonfly.git] / sys / vfs / nfs / bootp_subr.c
CommitLineData
984263bc
MD		 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 *
0e8ff41a
MD		 38 * nfs/krpc_subr.c
39 * $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
40 * $FreeBSD: src/sys/nfs/bootp_subr.c,v 1.20.2.9 2003/04/24 16:51:08 ambrisko Exp $
27eaa4f1 41 * $DragonFly: src/sys/vfs/nfs/bootp_subr.c,v 1.26 2008/03/08 07:50:49 sephe Exp $
984263bc
MD		 42 */
43
44#include "opt_bootp.h"
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/kernel.h>
49#include <sys/sockio.h>
50#include <sys/proc.h>
51#include <sys/malloc.h>
52#include <sys/mount.h>
53#include <sys/mbuf.h>
54#include <sys/socket.h>
55#include <sys/socketvar.h>
56#include <sys/sysctl.h>
57#include <sys/uio.h>
469cf181 58#include <sys/fcntl.h>
984263bc
MD		 59
60#include <net/if.h>
61#include <net/route.h>
62
63#include <netinet/in.h>
64#include <net/if_types.h>
65#include <net/if_dl.h>
66
1f2de5d4
MD		 67#include "rpcv2.h"
68#include "nfsproto.h"
69#include "nfs.h"
70#include "nfsdiskless.h"
71#include "krpc.h"
72#include "xdr_subs.h"
0e8ff41a 73#include "nfsmountrpc.h"
984263bc
MD		 74
75#define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */
76
77#ifndef BOOTP_SETTLE_DELAY
78#define BOOTP_SETTLE_DELAY 3
79#endif
80
81/*
82 * What is the longest we will wait before re-sending a request?
83 * Note this is also the frequency of "RPC timeout" messages.
84 * The re-send loop count sup linearly to this maximum, so the
85 * first complaint will happen after (1+2+3+4+5)=15 seconds.
86 */
87#define MAX_RESEND_DELAY 5 /* seconds */
88
89/* Definitions from RFC951 */
90struct bootp_packet {
91 u_int8_t op;
92 u_int8_t htype;
93 u_int8_t hlen;
94 u_int8_t hops;
95 u_int32_t xid;
96 u_int16_t secs;
97 u_int16_t flags;
98 struct in_addr ciaddr;
99 struct in_addr yiaddr;
100 struct in_addr siaddr;
101 struct in_addr giaddr;
102 unsigned char chaddr[16];
103 char sname[64];
104 char file[128];
105 unsigned char vend[1222];
106};
107
108struct bootpc_ifcontext {
109 struct bootpc_ifcontext *next;
110 struct bootp_packet call;
111 struct bootp_packet reply;
112 int replylen;
113 int overload;
114 struct socket *so;
115 struct ifreq ireq;
116 struct ifnet *ifp;
117 struct sockaddr_dl *sdl;
118 struct sockaddr_in myaddr;
119 struct sockaddr_in netmask;
120 struct sockaddr_in gw;
121 struct sockaddr_in broadcast; /* Different for each interface */
122 int gotgw;
123 int gotnetmask;
124 int gotrootpath;
125 int outstanding;
126 int sentmsg;
127 u_int32_t xid;
128 enum {
129 IF_BOOTP_UNRESOLVED,
130 IF_BOOTP_RESOLVED,
131 IF_BOOTP_FAILED,
132 IF_DHCP_UNRESOLVED,
133 IF_DHCP_OFFERED,
134 IF_DHCP_RESOLVED,
135 IF_DHCP_FAILED,
136 } state;
137 int dhcpquerytype; /* dhcp type sent */
138 struct in_addr dhcpserver;
139 int gotdhcpserver;
140};
141
142#define TAG_MAXLEN 1024
143struct bootpc_tagcontext {
144 char buf[TAG_MAXLEN + 1];
145 int overload;
146 int badopt;
147 int badtag;
148 int foundopt;
149 int taglen;
150};
151
152struct bootpc_globalcontext {
153 struct bootpc_ifcontext *interfaces;
154 struct bootpc_ifcontext *lastinterface;
155 u_int32_t xid;
156 int gotrootpath;
157 int gotswappath;
158 int gotgw;
159 int ifnum;
160 int secs;
161 int starttime;
162 struct bootp_packet reply;
163 int replylen;
164 struct bootpc_ifcontext *setswapfs;
165 struct bootpc_ifcontext *setrootfs;
166 struct bootpc_ifcontext *sethostname;
167 char lookup_path[24];
168 struct bootpc_tagcontext tmptag;
169 struct bootpc_tagcontext tag;
170};
171
172#define IPPORT_BOOTPC 68
173#define IPPORT_BOOTPS 67
174
175#define BOOTP_REQUEST 1
176#define BOOTP_REPLY 2
177
178/* Common tags */
179#define TAG_PAD 0 /* Pad option, implicit length 1 */
180#define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */
181#define TAG_ROUTERS 3 /* Routers (in order of preference) */
182#define TAG_HOSTNAME 12 /* Client host name */
183#define TAG_ROOT 17 /* Root path */
184
185/* DHCP specific tags */
186#define TAG_OVERLOAD 52 /* Option Overload */
187#define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */
188
189#define TAG_END 255 /* End Option (i.e. no more options) */
190
191/* Overload values */
192#define OVERLOAD_FILE 1
193#define OVERLOAD_SNAME 2
194
195/* Site specific tags: */
196#define TAG_SWAP 128
197#define TAG_SWAPSIZE 129
198#define TAG_ROOTOPTS 130
199#define TAG_SWAPOPTS 131
200#define TAG_COOKIE 134 /* ascii info for userland, exported via sysctl */
201
202#define TAG_DHCP_MSGTYPE 53
203#define TAG_DHCP_REQ_ADDR 50
204#define TAG_DHCP_SERVERID 54
205#define TAG_DHCP_LEASETIME 51
206
207#define TAG_VENDOR_INDENTIFIER 60
208
209#define DHCP_NOMSG 0
210#define DHCP_DISCOVER 1
211#define DHCP_OFFER 2
212#define DHCP_REQUEST 3
213#define DHCP_ACK 5
214
984263bc 215static char bootp_cookie[128];
984263bc
MD		 216SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
217 bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
218
219/* mountd RPC */
984263bc
MD		 220static void print_in_addr(struct in_addr addr);
221static void print_sin_addr(struct sockaddr_in *addr);
222static void clear_sinaddr(struct sockaddr_in *sin);
223static
224struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
225static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
226 struct bootpc_globalcontext *gctx,
7b95be2a 227 struct thread *td);
984263bc
MD		 228static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
229 struct bootp_packet *bp, int len, int tag);
230static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
231 unsigned char *start, int len, int tag);
232
233#ifdef BOOTP_DEBUG
234void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
235void bootpboot_p_ma(struct sockaddr *ma);
236void bootpboot_p_rtentry(struct rtentry *rt);
237void bootpboot_p_tree(struct radix_node *rn);
238void bootpboot_p_rtlist(void);
239void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
240void bootpboot_p_iflist(void);
241#endif
242
243static int bootpc_call(struct bootpc_globalcontext *gctx,
7b95be2a 244 struct thread *td);
984263bc
MD		 245
246static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
247 struct bootpc_globalcontext *gctx,
7b95be2a 248 struct thread *td);
984263bc
MD		 249
250static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
251 struct bootpc_globalcontext *gctx,
7b95be2a 252 struct thread *td);
984263bc
MD		 253
254static void bootpc_decode_reply(struct nfsv3_diskless *nd,
255 struct bootpc_ifcontext *ifctx,
256 struct bootpc_globalcontext *gctx);
257
258static int bootpc_received(struct bootpc_globalcontext *gctx,
259 struct bootpc_ifcontext *ifctx);
260
261static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
262static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
263static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
264
265void bootpc_init(void);
266
267/*
268 * In order to have multiple active interfaces with address 0.0.0.0
269 * and be able to send data to a selected interface, we perform
270 * some tricks:
271 *
272 * - The 'broadcast' address is different for each interface.
273 *
274 * - We temporarily add routing pointing 255.255.255.255 to the
275 * selected interface broadcast address, thus the packet sent
276 * goes to that interface.
277 */
278
279#ifdef BOOTP_DEBUG
280void
e851b29e 281bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
984263bc
MD		 282{
283 if (sa == NULL) {
086c1d7e 284 kprintf("(sockaddr *) <null>");
984263bc
MD		 285 return;
286 }
287 switch (sa->sa_family) {
288 case AF_INET:
289 {
290 struct sockaddr_in *sin;
291
292 sin = (struct sockaddr_in *) sa;
086c1d7e 293 kprintf("inet ");
984263bc
MD		 294 print_sin_addr(sin);
295 if (ma != NULL) {
296 sin = (struct sockaddr_in *) ma;
086c1d7e 297 kprintf(" mask ");
984263bc
MD		 298 print_sin_addr(sin);
299 }
300 }
301 break;
302 case AF_LINK:
303 {
304 struct sockaddr_dl *sli;
305 int i;
306
307 sli = (struct sockaddr_dl *) sa;
086c1d7e 308 kprintf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
984263bc
MD		 309 for (i = 0; i < sli->sdl_alen; i++) {
310 if (i > 0)
086c1d7e
SW		 311 kprintf(":");
312 kprintf("%x", ((unsigned char *) LLADDR(sli))[i]);
984263bc
MD		 313 }
314 }
315 break;
316 default:
086c1d7e 317 kprintf("af%d", sa->sa_family);
984263bc
MD		 318 }
319}
320
321
322void
323bootpboot_p_ma(struct sockaddr *ma)
324{
325 if (ma == NULL) {
086c1d7e 326 kprintf("<null>");
984263bc
MD		 327 return;
328 }
086c1d7e 329 kprintf("%x", *(int *)ma);
984263bc
MD		 330}
331
332
333void
334bootpboot_p_rtentry(struct rtentry *rt)
335{
336 bootpboot_p_sa(rt_key(rt), rt_mask(rt));
086c1d7e 337 kprintf(" ");
984263bc 338 bootpboot_p_ma(rt->rt_genmask);
086c1d7e 339 kprintf(" ");
984263bc 340 bootpboot_p_sa(rt->rt_gateway, NULL);
086c1d7e
SW		 341 kprintf(" ");
342 kprintf("flags %x", (unsigned short) rt->rt_flags);
343 kprintf(" %d", (int) rt->rt_rmx.rmx_expire);
344 kprintf(" %s\n", if_name(rt->rt_ifp));
984263bc
MD		 345}
346
347
348void
349bootpboot_p_tree(struct radix_node *rn)
350{
351 while (rn != NULL) {
352 if (rn->rn_bit < 0) {
353 if ((rn->rn_flags & RNF_ROOT) != 0) {
354 } else {
355 bootpboot_p_rtentry((struct rtentry *) rn);
356 }
357 rn = rn->rn_dupedkey;
358 } else {
359 bootpboot_p_tree(rn->rn_left);
360 bootpboot_p_tree(rn->rn_right);
361 return;
362 }
363 }
364}
365
366
367void
368bootpboot_p_rtlist(void)
369{
086c1d7e 370 kprintf("Routing table:\n");
984263bc
MD		 371 bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
372}
373
374
375void
376bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
377{
086c1d7e 378 kprintf("%s flags %x, addr ",
4beb866e 379 if_name(ifp),
984263bc
MD		 380 (unsigned short) ifp->if_flags);
381 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
086c1d7e 382 kprintf(", broadcast ");
984263bc 383 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
086c1d7e 384 kprintf(", netmask ");
984263bc 385 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
086c1d7e 386 kprintf("\n");
984263bc
MD		 387}
388
389
390void
391bootpboot_p_iflist(void)
392{
393 struct ifnet *ifp;
27eaa4f1 394 struct ifaddr_container *ifac;
984263bc 395
086c1d7e 396 kprintf("Interface list:\n");
ba127861 397 TAILQ_FOREACH(ifp, &ifnet, if_link) {
27eaa4f1
SZ		 398 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
399 struct ifaddr *ifa = ifac->ifa;
400
984263bc
MD		 401 if (ifa->ifa_addr->sa_family == AF_INET)
402 bootpboot_p_if(ifp, ifa);
27eaa4f1 403 }
984263bc
MD		 404 }
405}
406#endif /* defined(BOOTP_DEBUG) */
407
408
409static void
410clear_sinaddr(struct sockaddr_in *sin)
411{
412 bzero(sin, sizeof(*sin));
413 sin->sin_len = sizeof(*sin);
414 sin->sin_family = AF_INET;
415 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
416 sin->sin_port = 0;
417}
418
419
420static struct bootpc_ifcontext *
421allocifctx(struct bootpc_globalcontext *gctx)
422{
423 struct bootpc_ifcontext *ifctx;
77652cad 424 ifctx = (struct bootpc_ifcontext *) kmalloc(sizeof(*ifctx),
984263bc 425 M_TEMP, M_WAITOK);
984263bc
MD		 426 bzero(ifctx, sizeof(*ifctx));
427 ifctx->xid = gctx->xid;
428#ifdef BOOTP_NO_DHCP
429 ifctx->state = IF_BOOTP_UNRESOLVED;
430#else
431 ifctx->state = IF_DHCP_UNRESOLVED;
432#endif
433 gctx->xid += 0x100;
434 return ifctx;
435}
436
437
438static __inline int
439bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
440{
441 if (ifctx->state == IF_BOOTP_RESOLVED ||
442 ifctx->state == IF_DHCP_RESOLVED)
443 return 1;
444 return 0;
445}
446
447
448static __inline int
449bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
450{
451 if (ifctx->state == IF_BOOTP_UNRESOLVED ||
452 ifctx->state == IF_DHCP_UNRESOLVED)
453 return 1;
454 return 0;
455}
456
457
458static __inline int
459bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
460{
461 if (ifctx->state == IF_BOOTP_FAILED ||
462 ifctx->state == IF_DHCP_FAILED)
463 return 1;
464 return 0;
465}
466
467
468static int
469bootpc_received(struct bootpc_globalcontext *gctx,
470 struct bootpc_ifcontext *ifctx)
471{
472 unsigned char dhcpreplytype;
473 char *p;
474 /*
475 * Need timeout for fallback to less
476 * desirable alternative.
477 */
478
479
480 /* This call used for the side effect (badopt flag) */
481 (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
482 gctx->replylen,
483 TAG_END);
484
485 /* If packet is invalid, ignore it */
486 if (gctx->tmptag.badopt != 0)
487 return 0;
488
489 p = bootpc_tag(&gctx->tmptag, &gctx->reply,
490 gctx->replylen, TAG_DHCP_MSGTYPE);
491 if (p != NULL)
492 dhcpreplytype = *p;
493 else
494 dhcpreplytype = DHCP_NOMSG;
495
496 switch (ifctx->dhcpquerytype) {
497 case DHCP_DISCOVER:
498 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */
499#ifndef BOOTP_FORCE_DHCP
500 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */
501#endif
502 )
503 return 0;
504 break;
505 case DHCP_REQUEST:
506 if (dhcpreplytype != DHCP_ACK)
507 return 0;
de1bbfa4 508 /* fall through */
984263bc 509 case DHCP_NOMSG:
de1bbfa4 510 break;
984263bc
MD		 511 }
512
513
514 /* Ignore packet unless it gives us a root tag we didn't have */
515
516 if ((ifctx->state == IF_BOOTP_RESOLVED ||
517 (ifctx->dhcpquerytype == DHCP_DISCOVER &&
518 (ifctx->state == IF_DHCP_OFFERED ||
519 ifctx->state == IF_DHCP_RESOLVED))) &&
520 (bootpc_tag(&gctx->tmptag, &ifctx->reply,
521 ifctx->replylen,
522 TAG_ROOT) != NULL ||
523 bootpc_tag(&gctx->tmptag, &gctx->reply,
524 gctx->replylen,
525 TAG_ROOT) == NULL))
526 return 0;
527
528 bcopy(&gctx->reply,
529 &ifctx->reply,
530 gctx->replylen);
531 ifctx->replylen = gctx->replylen;
532
533 /* XXX: Only reset if 'perfect' response */
534 if (ifctx->state == IF_BOOTP_UNRESOLVED)
535 ifctx->state = IF_BOOTP_RESOLVED;
536 else if (ifctx->state == IF_DHCP_UNRESOLVED &&
537 ifctx->dhcpquerytype == DHCP_DISCOVER) {
538 if (dhcpreplytype == DHCP_OFFER)
539 ifctx->state = IF_DHCP_OFFERED;
540 else
541 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */
542 } else if (ifctx->state == IF_DHCP_OFFERED &&
543 ifctx->dhcpquerytype == DHCP_REQUEST)
544 ifctx->state = IF_DHCP_RESOLVED;
545
546
547 if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
548 ifctx->state != IF_BOOTP_RESOLVED) {
549 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
550 ifctx->replylen, TAG_DHCP_SERVERID);
551 if (p != NULL && gctx->tmptag.taglen == 4) {
552 memcpy(&ifctx->dhcpserver, p, 4);
553 ifctx->gotdhcpserver = 1;
554 } else
555 ifctx->gotdhcpserver = 0;
556 return 1;
557 }
558
559 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
560 ifctx->replylen,
561 TAG_ROOT) != NULL);
562 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
563 ifctx->replylen,
564 TAG_ROUTERS) != NULL);
565 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
566 ifctx->replylen,
567 TAG_SUBNETMASK) != NULL);
568 return 1;
569}
570
571static int
e851b29e 572bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
984263bc
MD		 573{
574 struct socket *so;
575 struct sockaddr_in *sin, dst;
576 struct uio auio;
577 struct sockopt sopt;
578 struct iovec aio;
579 int error, on, rcvflg, timo, len;
580 time_t atimo;
581 time_t rtimo;
582 struct timeval tv;
583 struct bootpc_ifcontext *ifctx;
584 int outstanding;
585 int gotrootpath;
586 int retry;
587 const char *s;
588
589 /*
590 * Create socket and set its recieve timeout.
591 */
7b95be2a 592 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
984263bc
MD		 593 if (error != 0)
594 goto out;
595
596 tv.tv_sec = 1;
597 tv.tv_usec = 0;
598 bzero(&sopt, sizeof(sopt));
599 sopt.sopt_level = SOL_SOCKET;
600 sopt.sopt_name = SO_RCVTIMEO;
601 sopt.sopt_val = &tv;
602 sopt.sopt_valsize = sizeof tv;
603
604 error = sosetopt(so, &sopt);
605 if (error != 0)
606 goto out;
607
608 /*
609 * Enable broadcast.
610 */
611 on = 1;
612 sopt.sopt_name = SO_BROADCAST;
613 sopt.sopt_val = &on;
614 sopt.sopt_valsize = sizeof on;
615
616 error = sosetopt(so, &sopt);
617 if (error != 0)
618 goto out;
619
620 /*
621 * Disable routing.
622 */
623
624 on = 1;
625 sopt.sopt_name = SO_DONTROUTE;
626 sopt.sopt_val = &on;
627 sopt.sopt_valsize = sizeof on;
628
629 error = sosetopt(so, &sopt);
630 if (error != 0)
631 goto out;
632
633 /*
634 * Bind the local endpoint to a bootp client port.
635 */
636 sin = &dst;
637 clear_sinaddr(sin);
638 sin->sin_port = htons(IPPORT_BOOTPC);
7b95be2a 639 error = sobind(so, (struct sockaddr *)sin, td);
984263bc 640 if (error != 0) {
086c1d7e 641 kprintf("bind failed\n");
984263bc
MD		 642 goto out;
643 }
644
645 /*
646 * Setup socket address for the server.
647 */
648 sin = &dst;
649 clear_sinaddr(sin);
650 sin->sin_addr.s_addr = INADDR_BROADCAST;
651 sin->sin_port = htons(IPPORT_BOOTPS);
652
653 /*
654 * Send it, repeatedly, until a reply is received,
655 * but delay each re-send by an increasing amount.
656 * If the delay hits the maximum, start complaining.
657 */
658 timo = 0;
659 rtimo = 0;
660 for (;;) {
661
662 outstanding = 0;
663 gotrootpath = 0;
664
665 for (ifctx = gctx->interfaces;
666 ifctx != NULL;
667 ifctx = ifctx->next) {
668 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
669 bootpc_tag(&gctx->tmptag, &ifctx->reply,
670 ifctx->replylen,
671 TAG_ROOT) != NULL)
672 gotrootpath = 1;
673 }
674
675 for (ifctx = gctx->interfaces;
676 ifctx != NULL;
677 ifctx = ifctx->next) {
678 ifctx->outstanding = 0;
679 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
680 gotrootpath != 0) {
681 continue;
682 }
683 if (bootpc_ifctx_isfailed(ifctx) != 0)
684 continue;
685
686 outstanding++;
687 ifctx->outstanding = 1;
688
689 /* Proceed to next step in DHCP negotiation */
690 if ((ifctx->state == IF_DHCP_OFFERED &&
691 ifctx->dhcpquerytype != DHCP_REQUEST) ||
692 (ifctx->state == IF_DHCP_UNRESOLVED &&
693 ifctx->dhcpquerytype != DHCP_DISCOVER) ||
694 (ifctx->state == IF_BOOTP_UNRESOLVED &&
695 ifctx->dhcpquerytype != DHCP_NOMSG)) {
696 ifctx->sentmsg = 0;
7b95be2a 697 bootpc_compose_query(ifctx, gctx, td);
984263bc
MD		 698 }
699
700 /* Send BOOTP request (or re-send). */
701
702 if (ifctx->sentmsg == 0) {
703 switch(ifctx->dhcpquerytype) {
704 case DHCP_DISCOVER:
705 s = "DHCP Discover";
706 break;
707 case DHCP_REQUEST:
708 s = "DHCP Request";
709 break;
710 case DHCP_NOMSG:
711 default:
712 s = "BOOTP Query";
713 break;
714 }
086c1d7e 715 kprintf("Sending %s packet from "
984263bc
MD		 716 "interface %s (%*D)\n",
717 s,
718 ifctx->ireq.ifr_name,
719 ifctx->sdl->sdl_alen,
720 (unsigned char *) LLADDR(ifctx->sdl),
721 ":");
722 ifctx->sentmsg = 1;
723 }
724
725 aio.iov_base = (caddr_t) &ifctx->call;
726 aio.iov_len = sizeof(ifctx->call);
727
728 auio.uio_iov = &aio;
729 auio.uio_iovcnt = 1;
730 auio.uio_segflg = UIO_SYSSPACE;
731 auio.uio_rw = UIO_WRITE;
732 auio.uio_offset = 0;
733 auio.uio_resid = sizeof(ifctx->call);
7b95be2a 734 auio.uio_td = td;
984263bc
MD		 735
736 /* Set netmask to 0.0.0.0 */
737
738 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
739 clear_sinaddr(sin);
740 error = ifioctl(ifctx->so, SIOCSIFNETMASK,
71ed21e4 741 (caddr_t) &ifctx->ireq, proc0.p_ucred);
984263bc
MD		 742 if (error != 0)
743 panic("bootpc_call:"
744 "set if netmask, error=%d",
745 error);
746
747 error = sosend(so, (struct sockaddr *) &dst,
7b95be2a 748 &auio, NULL, NULL, 0, td);
984263bc 749 if (error != 0) {
086c1d7e 750 kprintf("bootpc_call: sosend: %d state %08x\n",
984263bc
MD		 751 error, (int) so->so_state);
752 }
753
754 /* XXX: Is this needed ? */
377d4740 755 tsleep(&error, 0, "bootpw", 10);
984263bc
MD		 756
757 /* Set netmask to 255.0.0.0 */
758
759 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
760 clear_sinaddr(sin);
761 sin->sin_addr.s_addr = htonl(0xff000000u);
762 error = ifioctl(ifctx->so, SIOCSIFNETMASK,
71ed21e4 763 (caddr_t) &ifctx->ireq, proc0.p_ucred);
984263bc
MD		 764 if (error != 0)
765 panic("bootpc_call:"
766 "set if netmask, error=%d",
767 error);
768
769 }
770
771 if (outstanding == 0 &&
772 (rtimo == 0 || time_second >= rtimo)) {
773 error = 0;
774 goto gotreply;
775 }
776
777 /* Determine new timeout. */
778 if (timo < MAX_RESEND_DELAY)
779 timo++;
780 else {
086c1d7e 781 kprintf("DHCP/BOOTP timeout for server ");
984263bc 782 print_sin_addr(&dst);
086c1d7e 783 kprintf("\n");
984263bc
MD		 784 }
785
786 /*
787 * Wait for up to timo seconds for a reply.
788 * The socket receive timeout was set to 1 second.
789 */
790 atimo = timo + time_second;
791 while (time_second < atimo) {
792 aio.iov_base = (caddr_t) &gctx->reply;
793 aio.iov_len = sizeof(gctx->reply);
794
795 auio.uio_iov = &aio;
796 auio.uio_iovcnt = 1;
797 auio.uio_segflg = UIO_SYSSPACE;
798 auio.uio_rw = UIO_READ;
799 auio.uio_offset = 0;
800 auio.uio_resid = sizeof(gctx->reply);
7b95be2a 801 auio.uio_td = td;
984263bc
MD		 802
803 rcvflg = 0;
804 error = soreceive(so, NULL, &auio,
805 NULL, NULL, &rcvflg);
806 gctx->secs = time_second - gctx->starttime;
807 for (ifctx = gctx->interfaces;
808 ifctx != NULL;
809 ifctx = ifctx->next) {
810 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
811 bootpc_ifctx_isfailed(ifctx) != 0)
812 continue;
813
814 ifctx->call.secs = htons(gctx->secs);
815 }
816 if (error == EWOULDBLOCK)
817 continue;
818 if (error != 0)
819 goto out;
820 len = sizeof(gctx->reply) - auio.uio_resid;
821
822 /* Do we have the required number of bytes ? */
823 if (len < BOOTP_MIN_LEN)
824 continue;
825 gctx->replylen = len;
826
827 /* Is it a reply? */
828 if (gctx->reply.op != BOOTP_REPLY)
829 continue;
830
831 /* Is this an answer to our query */
832 for (ifctx = gctx->interfaces;
833 ifctx != NULL;
834 ifctx = ifctx->next) {
835 if (gctx->reply.xid != ifctx->call.xid)
836 continue;
837
838 /* Same HW address size ? */
839 if (gctx->reply.hlen != ifctx->call.hlen)
840 continue;
841
842 /* Correct HW address ? */
843 if (bcmp(gctx->reply.chaddr,
844 ifctx->call.chaddr,
845 ifctx->call.hlen) != 0)
846 continue;
847
848 break;
849 }
850
851 if (ifctx != NULL) {
852 s = bootpc_tag(&gctx->tmptag,
853 &gctx->reply,
854 gctx->replylen,
855 TAG_DHCP_MSGTYPE);
856 if (s != NULL) {
857 switch (*s) {
858 case DHCP_OFFER:
859 s = "DHCP Offer";
860 break;
861 case DHCP_ACK:
862 s = "DHCP Ack";
863 break;
864 default:
865 s = "DHCP (unexpected)";
866 break;
867 }
868 } else
869 s = "BOOTP Reply";
870
086c1d7e 871 kprintf("Received %s packet"
984263bc
MD		 872 " on %s from ",
873 s,
874 ifctx->ireq.ifr_name);
875 print_in_addr(gctx->reply.siaddr);
876 if (gctx->reply.giaddr.s_addr !=
877 htonl(INADDR_ANY)) {
086c1d7e 878 kprintf(" via ");
984263bc
MD		 879 print_in_addr(gctx->reply.giaddr);
880 }
881 if (bootpc_received(gctx, ifctx) != 0) {
086c1d7e 882 kprintf(" (accepted)");
984263bc
MD		 883 if (ifctx->outstanding) {
884 ifctx->outstanding = 0;
885 outstanding--;
886 }
887 /* Network settle delay */
888 if (outstanding == 0)
889 atimo = time_second +
890 BOOTP_SETTLE_DELAY;
891 } else
086c1d7e 892 kprintf(" (ignored)");
984263bc
MD		 893 if (ifctx->gotrootpath) {
894 gotrootpath = 1;
895 rtimo = time_second +
896 BOOTP_SETTLE_DELAY;
086c1d7e 897 kprintf(" (got root path)");
984263bc 898 } else
086c1d7e
SW		 899 kprintf(" (no root path)");
900 kprintf("\n");
984263bc
MD		 901 }
902 } /* while secs */
903#ifdef BOOTP_TIMEOUT
904 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
905 break;
906#endif
907 /* Force a retry if halfway in DHCP negotiation */
908 retry = 0;
909 for (ifctx = gctx->interfaces; ifctx != NULL;
910 ifctx = ifctx->next) {
911 if (ifctx->state == IF_DHCP_OFFERED) {
912 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
913 retry = 1;
914 else
915 ifctx->state = IF_DHCP_UNRESOLVED;
916 }
917 }
918
919 if (retry != 0)
920 continue;
921
922 if (gotrootpath != 0) {
923 gctx->gotrootpath = gotrootpath;
924 if (rtimo != 0 && time_second >= rtimo)
925 break;
926 }
927 } /* forever send/receive */
928
929 /*
930 * XXX: These are errors of varying seriousness being silently
931 * ignored
932 */
933
934 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
935 if (bootpc_ifctx_isresolved(ifctx) == 0) {
086c1d7e 936 kprintf("%s timeout for interface %s\n",
984263bc
MD		 937 ifctx->dhcpquerytype != DHCP_NOMSG ?
938 "DHCP" : "BOOTP",
939 ifctx->ireq.ifr_name);
940 }
941 }
942 if (gctx->gotrootpath != 0) {
943#if 0
086c1d7e 944 kprintf("Got a root path, ignoring remaining timeout\n");
984263bc
MD		 945#endif
946 error = 0;
947 goto out;
948 }
949#ifndef BOOTP_NFSROOT
950 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
951 if (bootpc_ifctx_isresolved(ifctx) != 0) {
952 error = 0;
953 goto out;
954 }
955 }
956#endif
957 error = ETIMEDOUT;
958 goto out;
959
960gotreply:
961out:
9ba76b73 962 soclose(so, FNONBLOCK);
984263bc
MD		 963 return error;
964}
965
966
967static int
968bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
969 struct bootpc_globalcontext *gctx,
7b95be2a 970 struct thread *td)
984263bc 971{
b2632176 972 struct ifaddr_container *ifac;
984263bc
MD		 973 struct sockaddr_in *sin;
974 int error;
975
976 struct ifreq *ireq;
977 struct socket *so;
984263bc
MD		 978 struct sockaddr_dl *sdl;
979
7b95be2a 980 error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
984263bc
MD		 981 if (error != 0)
982 panic("nfs_boot: socreate, error=%d", error);
983
984 ireq = &ifctx->ireq;
985 so = ifctx->so;
986
987 /*
988 * Bring up the interface.
989 *
990 * Get the old interface flags and or IFF_UP into them; if
991 * IFF_UP set blindly, interface selection can be clobbered.
992 */
71ed21e4 993 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
984263bc
MD		 994 if (error != 0)
995 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
996 ireq->ifr_flags |= IFF_UP;
71ed21e4 997 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
984263bc
MD		 998 if (error != 0)
999 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1000
1001 /*
1002 * Do enough of ifconfig(8) so that the chosen interface
1003 * can talk to the servers. (just set the address)
1004 */
1005
1006 /* addr is 0.0.0.0 */
1007
1008 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1009 clear_sinaddr(sin);
71ed21e4 1010 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
984263bc
MD		 1011 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1012 panic("bootpc_fakeup_interface: "
1013 "set if addr, error=%d", error);
1014
1015 /* netmask is 255.0.0.0 */
1016
1017 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1018 clear_sinaddr(sin);
1019 sin->sin_addr.s_addr = htonl(0xff000000u);
71ed21e4 1020 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
984263bc
MD		 1021 if (error != 0)
1022 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1023 error);
1024
1025 /* Broadcast is 255.255.255.255 */
1026
1027 sin = (struct sockaddr_in *)&ireq->ifr_addr;
1028 clear_sinaddr(sin);
1029 clear_sinaddr(&ifctx->broadcast);
1030 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1031 ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1032
71ed21e4 1033 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
984263bc
MD		 1034 if (error != 0 && error != EADDRNOTAVAIL)
1035 panic("bootpc_fakeup_interface: "
1036 "set if broadcast addr, error=%d",
1037 error);
1038 error = 0;
1039
1040 /* Get HW address */
1041
1042 sdl = NULL;
b2632176
SZ		 1043 TAILQ_FOREACH(ifac, &ifctx->ifp->if_addrheads[mycpuid], ifa_link) {
1044 struct ifaddr *ifa = ifac->ifa;
1045
984263bc
MD		 1046 if (ifa->ifa_addr->sa_family == AF_LINK &&
1047 (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1048 sdl->sdl_type == IFT_ETHER)
1049 break;
b2632176
SZ		 1050 }
1051
984263bc
MD		 1052 if (sdl == NULL)
1053 panic("bootpc: Unable to find HW address for %s",
1054 ifctx->ireq.ifr_name);
1055 ifctx->sdl = sdl;
1056
1057 return error;
1058}
1059
1060
1061static int
1062bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1063 struct bootpc_globalcontext *gctx,
7b95be2a 1064 struct thread *td)
984263bc
MD		 1065{
1066 int error;
1067 struct sockaddr_in defdst;
1068 struct sockaddr_in defmask;
1069 struct sockaddr_in *sin;
1070
1071 struct ifreq *ireq;
1072 struct socket *so;
1073 struct sockaddr_in *myaddr;
1074 struct sockaddr_in *netmask;
1075 struct sockaddr_in *gw;
1076
1077 ireq = &ifctx->ireq;
1078 so = ifctx->so;
1079 myaddr = &ifctx->myaddr;
1080 netmask = &ifctx->netmask;
1081 gw = &ifctx->gw;
1082
1083 if (bootpc_ifctx_isresolved(ifctx) == 0) {
1084
1085 /* Shutdown interfaces where BOOTP failed */
1086
086c1d7e 1087 kprintf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
71ed21e4 1088 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
984263bc
MD		 1089 if (error != 0)
1090 panic("bootpc_adjust_interface: "
1091 "SIOCGIFFLAGS, error=%d", error);
1092 ireq->ifr_flags &= ~IFF_UP;
71ed21e4 1093 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
984263bc
MD		 1094 if (error != 0)
1095 panic("bootpc_adjust_interface: "
1096 "SIOCSIFFLAGS, error=%d", error);
1097
1098 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1099 clear_sinaddr(sin);
71ed21e4 1100 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
984263bc
MD		 1101 if (error != 0 && (error != EADDRNOTAVAIL ||
1102 ifctx == gctx->interfaces))
1103 panic("bootpc_adjust_interface: "
1104 "SIOCDIFADDR, error=%d", error);
1105
1106 return 0;
1107 }
1108
086c1d7e 1109 kprintf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
984263bc
MD		 1110 /*
1111 * Do enough of ifconfig(8) so that the chosen interface
1112 * can talk to the servers. (just set the address)
1113 */
1114 bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
71ed21e4 1115 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
984263bc
MD		 1116 if (error != 0)
1117 panic("bootpc_adjust_interface: "
1118 "set if netmask, error=%d", error);
1119
1120 /* Broadcast is with host part of IP address all 1's */
1121
1122 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1123 clear_sinaddr(sin);
1124 sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1125 ~ netmask->sin_addr.s_addr;
71ed21e4 1126 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
984263bc
MD		 1127 if (error != 0)
1128 panic("bootpc_adjust_interface: "
1129 "set if broadcast addr, error=%d", error);
1130
1131 bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
71ed21e4 1132 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
984263bc
MD		 1133 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1134 panic("bootpc_adjust_interface: "
1135 "set if addr, error=%d", error);
1136
1137 /* Add new default route */
1138
1139 if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1140 clear_sinaddr(&defdst);
1141 clear_sinaddr(&defmask);
ecdefdda
MD		 1142 error = rtrequest_global(RTM_ADD, (struct sockaddr *) &defdst,
1143 (struct sockaddr *) gw,
1144 (struct sockaddr *) &defmask,
1145 (RTF_UP | RTF_GATEWAY | RTF_STATIC));
984263bc 1146 if (error != 0) {
086c1d7e 1147 kprintf("bootpc_adjust_interface: "
984263bc
MD		 1148 "add net route, error=%d\n", error);
1149 return error;
1150 }
1151 }
1152
1153 return 0;
1154}
1155
984263bc
MD		 1156static void
1157print_sin_addr(struct sockaddr_in *sin)
1158{
1159 print_in_addr(sin->sin_addr);
1160}
1161
1162
1163static void
1164print_in_addr(struct in_addr addr)
1165{
1166 unsigned int ip;
1167
1168 ip = ntohl(addr.s_addr);
086c1d7e 1169 kprintf("%d.%d.%d.%d",
984263bc
MD		 1170 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1171}
1172
1173static void
e851b29e
CP		 1174bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1175 struct bootpc_globalcontext *gctx, struct thread *td)
984263bc
MD		 1176{
1177 unsigned char *vendp;
1178 unsigned char vendor_client[64];
1179 uint32_t leasetime;
1180 uint8_t vendor_client_len;
1181
1182 ifctx->gotrootpath = 0;
1183
1184 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1185
1186 /* bootpc part */
1187 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */
1188 ifctx->call.htype = 1; /* 10mb ethernet */
1189 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1190 ifctx->call.hops = 0;
1191 if (bootpc_ifctx_isunresolved(ifctx) != 0)
1192 ifctx->xid++;
1193 ifctx->call.xid = txdr_unsigned(ifctx->xid);
1194 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1195
1196 vendp = ifctx->call.vend;
1197 *vendp++ = 99; /* RFC1048 cookie */
1198 *vendp++ = 130;
1199 *vendp++ = 83;
1200 *vendp++ = 99;
1201 *vendp++ = TAG_MAXMSGSIZE;
1202 *vendp++ = 2;
1203 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1204 *vendp++ = sizeof(struct bootp_packet) & 255;
1205
f8c7a42d 1206 ksnprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
984263bc
MD		 1207 ostype, MACHINE, osrelease);
1208 vendor_client_len = strlen(vendor_client);
1209 *vendp++ = TAG_VENDOR_INDENTIFIER;
1210 *vendp++ = vendor_client_len;
1211 memcpy(vendp, vendor_client, vendor_client_len);
fc6d0222 1212 vendp += vendor_client_len;
984263bc
MD		 1213 ifctx->dhcpquerytype = DHCP_NOMSG;
1214 switch (ifctx->state) {
1215 case IF_DHCP_UNRESOLVED:
1216 *vendp++ = TAG_DHCP_MSGTYPE;
1217 *vendp++ = 1;
1218 *vendp++ = DHCP_DISCOVER;
1219 ifctx->dhcpquerytype = DHCP_DISCOVER;
1220 ifctx->gotdhcpserver = 0;
1221 break;
1222 case IF_DHCP_OFFERED:
1223 *vendp++ = TAG_DHCP_MSGTYPE;
1224 *vendp++ = 1;
1225 *vendp++ = DHCP_REQUEST;
1226 ifctx->dhcpquerytype = DHCP_REQUEST;
1227 *vendp++ = TAG_DHCP_REQ_ADDR;
1228 *vendp++ = 4;
1229 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1230 vendp += 4;
1231 if (ifctx->gotdhcpserver != 0) {
1232 *vendp++ = TAG_DHCP_SERVERID;
1233 *vendp++ = 4;
1234 memcpy(vendp, &ifctx->dhcpserver, 4);
1235 vendp += 4;
1236 }
1237 *vendp++ = TAG_DHCP_LEASETIME;
1238 *vendp++ = 4;
1239 leasetime = htonl(300);
1240 memcpy(vendp, &leasetime, 4);
1241 vendp += 4;
1242 default:
1243 ;
1244 }
1245 *vendp = TAG_END;
1246
1247 ifctx->call.secs = 0;
1248 ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1249}
1250
1251
1252static int
1253bootpc_hascookie(struct bootp_packet *bp)
1254{
1255 return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1256 bp->vend[2] == 83 && bp->vend[3] == 99);
1257}
1258
1259
1260static void
1261bootpc_tag_helper(struct bootpc_tagcontext *tctx,
e851b29e 1262 unsigned char *start, int len, int tag)
984263bc
MD		 1263{
1264 unsigned char *j;
1265 unsigned char *ej;
1266 unsigned char code;
1267
1268 if (tctx->badtag != 0 || tctx->badopt != 0)
1269 return;
1270
1271 j = start;
1272 ej = j + len;
1273
1274 while (j < ej) {
1275 code = *j++;
1276 if (code == TAG_PAD)
1277 continue;
1278 if (code == TAG_END)
1279 return;
1280 if (j >= ej || j + *j + 1 > ej) {
1281 tctx->badopt = 1;
1282 return;
1283 }
1284 len = *j++;
1285 if (code == tag) {
1286 if (tctx->taglen + len > TAG_MAXLEN) {
1287 tctx->badtag = 1;
1288 return;
1289 }
1290 tctx->foundopt = 1;
1291 if (len > 0)
1292 memcpy(tctx->buf + tctx->taglen,
1293 j, len);
1294 tctx->taglen += len;
1295 }
1296 if (code == TAG_OVERLOAD)
1297 tctx->overload = *j;
1298
1299 j += len;
1300 }
1301}
1302
1303
1304static unsigned char *
e851b29e
CP		 1305bootpc_tag(struct bootpc_tagcontext *tctx, struct bootp_packet *bp,
1306 int len, int tag)
984263bc
MD		 1307{
1308 unsigned char *j;
1309 unsigned char *ej;
1310
1311 tctx->overload = 0;
1312 tctx->badopt = 0;
1313 tctx->badtag = 0;
1314 tctx->foundopt = 0;
1315 tctx->taglen = 0;
1316
1317 if (bootpc_hascookie(bp) == 0)
1318 return NULL;
1319
1320 j = &bp->vend[4];
1321 ej = (unsigned char *) bp + len;
1322
1323 bootpc_tag_helper(tctx, &bp->vend[4],
1324 (unsigned char *) bp + len - &bp->vend[4], tag);
1325
1326 if ((tctx->overload & OVERLOAD_FILE) != 0)
1327 bootpc_tag_helper(tctx,
1328 (unsigned char *) bp->file,
1329 sizeof(bp->file),
1330 tag);
1331 if ((tctx->overload & OVERLOAD_SNAME) != 0)
1332 bootpc_tag_helper(tctx,
1333 (unsigned char *) bp->sname,
1334 sizeof(bp->sname),
1335 tag);
1336
1337 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1338 return NULL;
1339 tctx->buf[tctx->taglen] = '\0';
1340 return tctx->buf;
1341}
1342
1343
1344static void
e851b29e
CP		 1345bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1346 struct bootpc_globalcontext *gctx)
984263bc
MD		 1347{
1348 char *p;
1349 unsigned int ip;
1350
1351 ifctx->gotgw = 0;
1352 ifctx->gotnetmask = 0;
1353
1354 clear_sinaddr(&ifctx->myaddr);
1355 clear_sinaddr(&ifctx->netmask);
1356 clear_sinaddr(&ifctx->gw);
1357
1358 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1359
1360 ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
f8c7a42d 1361 ksnprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
984263bc
MD		 1362 "swap.%d.%d.%d.%d",
1363 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1364
086c1d7e 1365 kprintf("%s at ", ifctx->ireq.ifr_name);
984263bc 1366 print_sin_addr(&ifctx->myaddr);
086c1d7e 1367 kprintf(" server ");
984263bc
MD		 1368 print_in_addr(ifctx->reply.siaddr);
1369
1370 ifctx->gw.sin_addr = ifctx->reply.giaddr;
1371 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
086c1d7e 1372 kprintf(" via gateway ");
984263bc
MD		 1373 print_in_addr(ifctx->reply.giaddr);
1374 }
1375
1376 /* This call used for the side effect (overload flag) */
1377 (void) bootpc_tag(&gctx->tmptag,
1378 &ifctx->reply, ifctx->replylen, TAG_END);
1379
1380 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1381 if (ifctx->reply.sname[0] != '\0')
086c1d7e 1382 kprintf(" server name %s", ifctx->reply.sname);
984263bc
MD		 1383 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1384 if (ifctx->reply.file[0] != '\0')
086c1d7e 1385 kprintf(" boot file %s", ifctx->reply.file);
984263bc 1386
086c1d7e 1387 kprintf("\n");
984263bc
MD		 1388
1389 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1390 TAG_SUBNETMASK);
1391 if (p != NULL) {
1392 if (gctx->tag.taglen != 4)
1393 panic("bootpc: subnet mask len is %d",
1394 gctx->tag.taglen);
1395 bcopy(p, &ifctx->netmask.sin_addr, 4);
1396 ifctx->gotnetmask = 1;
086c1d7e 1397 kprintf("subnet mask ");
984263bc 1398 print_sin_addr(&ifctx->netmask);
086c1d7e 1399 kprintf(" ");
984263bc
MD		 1400 }
1401
1402 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1403 TAG_ROUTERS);
1404 if (p != NULL) {
1405 /* Routers */
1406 if (gctx->tag.taglen % 4)
1407 panic("bootpc: Router Len is %d", gctx->tag.taglen);
1408 if (gctx->tag.taglen > 0) {
1409 bcopy(p, &ifctx->gw.sin_addr, 4);
086c1d7e 1410 kprintf("router ");
984263bc 1411 print_sin_addr(&ifctx->gw);
086c1d7e 1412 kprintf(" ");
984263bc
MD		 1413 ifctx->gotgw = 1;
1414 gctx->gotgw = 1;
1415 }
1416 }
1417
1418 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1419 TAG_ROOT);
1420 if (p != NULL) {
1421 if (gctx->setrootfs != NULL) {
086c1d7e 1422 kprintf("rootfs %s (ignored) ", p);
984263bc
MD		 1423 } else if (setfs(&nd->root_saddr,
1424 nd->root_hostnam, p)) {
086c1d7e 1425 kprintf("rootfs %s ",p);
984263bc
MD		 1426 gctx->gotrootpath = 1;
1427 ifctx->gotrootpath = 1;
1428 gctx->setrootfs = ifctx;
1429
1430 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1431 ifctx->replylen,
1432 TAG_ROOTOPTS);
1433 if (p != NULL) {
b9a7a2bd 1434 nfs_mountopts(&nd->root_args, p);
086c1d7e 1435 kprintf("rootopts %s ", p);
984263bc
MD		 1436 }
1437 } else
1438 panic("Failed to set rootfs to %s",p);
1439 }
1440
1441 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1442 TAG_SWAP);
1443 if (p != NULL) {
1444 if (gctx->setswapfs != NULL) {
086c1d7e 1445 kprintf("swapfs %s (ignored) ", p);
984263bc
MD		 1446 } else if (setfs(&nd->swap_saddr,
1447 nd->swap_hostnam, p)) {
1448 gctx->gotswappath = 1;
1449 gctx->setswapfs = ifctx;
086c1d7e 1450 kprintf("swapfs %s ", p);
984263bc
MD		 1451
1452 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1453 ifctx->replylen,
1454 TAG_SWAPOPTS);
1455 if (p != NULL) {
1456 /* swap mount options */
b9a7a2bd 1457 nfs_mountopts(&nd->swap_args, p);
086c1d7e 1458 kprintf("swapopts %s ", p);
984263bc
MD		 1459 }
1460
1461 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1462 ifctx->replylen,
1463 TAG_SWAPSIZE);
1464 if (p != NULL) {
1465 int swaplen;
1466 if (gctx->tag.taglen != 4)
1467 panic("bootpc: "
1468 "Expected 4 bytes for swaplen, "
1469 "not %d bytes",
1470 gctx->tag.taglen);
1471 bcopy(p, &swaplen, 4);
1472 nd->swap_nblks = ntohl(swaplen);
086c1d7e 1473 kprintf("swapsize %d KB ",
984263bc
MD		 1474 nd->swap_nblks);
1475 }
1476 } else
1477 panic("Failed to set swapfs to %s", p);
1478 }
1479
1480 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1481 TAG_HOSTNAME);
1482 if (p != NULL) {
1483 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1484 panic("bootpc: hostname >= %d bytes",
1485 MAXHOSTNAMELEN);
1486 if (gctx->sethostname != NULL) {
086c1d7e 1487 kprintf("hostname %s (ignored) ", p);
984263bc
MD		 1488 } else {
1489 strcpy(nd->my_hostnam, p);
1490 strcpy(hostname, p);
086c1d7e 1491 kprintf("hostname %s ",hostname);
984263bc
MD		 1492 gctx->sethostname = ifctx;
1493 }
1494 }
1495 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1496 TAG_COOKIE);
1497 if (p != NULL) { /* store in a sysctl variable */
1498 int i, l = sizeof(bootp_cookie) - 1;
1499 for (i = 0; i < l && p[i] != '\0'; i++)
1500 bootp_cookie[i] = p[i];
1501 p[i] = '\0';
1502 }
1503
086c1d7e 1504 kprintf("\n");
984263bc
MD		 1505
1506 if (ifctx->gotnetmask == 0) {
1507 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1508 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1509 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1510 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1511 else
1512 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1513 }
1514 if (ifctx->gotgw == 0) {
1515 /* Use proxyarp */
1516 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1517 }
1518}
1519
1520void
1521bootpc_init(void)
1522{
1523 struct bootpc_ifcontext *ifctx, *nctx; /* Interface BOOTP contexts */
1524 struct bootpc_globalcontext *gctx; /* Global BOOTP context */
1525 struct ifnet *ifp;
1526 int error;
1527 struct nfsv3_diskless *nd;
7b95be2a 1528 struct thread *td;
984263bc
MD		 1529
1530 nd = &nfsv3_diskless;
7b95be2a 1531 td = curthread;
984263bc
MD		 1532
1533 /*
1534 * If already filled in, don't touch it here
1535 */
1536 if (nfs_diskless_valid != 0)
1537 return;
1538
1539 /*
1540 * Wait until arp entries can be handled.
1541 */
1542 while (time_second == 0)
377d4740 1543 tsleep(&time_second, 0, "arpkludge", 10);
984263bc 1544
e7b4468c 1545 gctx = kmalloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
984263bc 1546
984263bc
MD		 1547 gctx->xid = ~0xFFFF;
1548 gctx->starttime = time_second;
1549
1550 ifctx = allocifctx(gctx);
1551
1552 /*
1553 * Find a network interface.
1554 */
1555#ifdef BOOTP_WIRED_TO
086c1d7e 1556 kprintf("bootpc_init: wired to interface '%s'\n",
984263bc
MD		 1557 __XSTRING(BOOTP_WIRED_TO));
1558#endif
1559 bzero(&ifctx->ireq, sizeof(ifctx->ireq));
ba127861 1560 TAILQ_FOREACH(ifp, &ifnet, if_link) {
4beb866e
MD		 1561 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1562 sizeof(ifctx->ireq.ifr_name));
984263bc
MD		 1563#ifdef BOOTP_WIRED_TO
1564 if (strcmp(ifctx->ireq.ifr_name,
1565 __XSTRING(BOOTP_WIRED_TO)) != 0)
1566 continue;
1567#else
1568 if ((ifp->if_flags &
1569 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1570 IFF_BROADCAST)
1571 continue;
1572#endif
1573 if (gctx->interfaces != NULL)
1574 gctx->lastinterface->next = ifctx;
1575 else
1576 gctx->interfaces = ifctx;
1577 ifctx->ifp = ifp;
1578 gctx->lastinterface = ifctx;
1579 ifctx = allocifctx(gctx);
1580 }
efda3bd0 1581 kfree(ifctx, M_TEMP);
984263bc
MD		 1582
1583 if (gctx->interfaces == NULL) {
1584#ifdef BOOTP_WIRED_TO
1585 panic("bootpc_init: Could not find interface specified "
1586 "by BOOTP_WIRED_TO: "
1587 __XSTRING(BOOTP_WIRED_TO));
1588#else
1589 panic("bootpc_init: no suitable interface");
1590#endif
1591 }
1592
1593 gctx->gotrootpath = 0;
1594 gctx->gotswappath = 0;
1595 gctx->gotgw = 0;
1596
1597 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
7b95be2a 1598 bootpc_fakeup_interface(ifctx, gctx, td);
984263bc
MD		 1599
1600 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
7b95be2a 1601 bootpc_compose_query(ifctx, gctx, td);
984263bc
MD		 1602
1603 ifctx = gctx->interfaces;
7b95be2a 1604 error = bootpc_call(gctx, td);
984263bc
MD		 1605
1606 if (error != 0) {
1607#ifdef BOOTP_NFSROOT
1608 panic("BOOTP call failed");
1609#else
086c1d7e 1610 kprintf("BOOTP call failed\n");
984263bc
MD		 1611#endif
1612 }
1613
b9a7a2bd 1614 nfs_mountopts(&nd->root_args, NULL);
984263bc 1615
b9a7a2bd 1616 nfs_mountopts(&nd->swap_args, NULL);
984263bc
MD		 1617
1618 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1619 if (bootpc_ifctx_isresolved(ifctx) != 0)
1620 bootpc_decode_reply(nd, ifctx, gctx);
1621
1622 if (gctx->gotswappath == 0)
1623 nd->swap_nblks = 0;
1624#ifdef BOOTP_NFSROOT
1625 if (gctx->gotrootpath == 0)
1626 panic("bootpc: No root path offered");
1627#endif
1628
1629 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
7b95be2a 1630 bootpc_adjust_interface(ifctx, gctx, td);
984263bc 1631
9ba76b73 1632 soclose(ifctx->so, FNONBLOCK);
984263bc
MD		 1633 }
1634
1635 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1636 if (ifctx->gotrootpath != 0)
1637 break;
1638 if (ifctx == NULL) {
1639 for (ifctx = gctx->interfaces;
1640 ifctx != NULL;
1641 ifctx = ifctx->next)
1642 if (bootpc_ifctx_isresolved(ifctx) != 0)
1643 break;
1644 }
1645 if (ifctx == NULL)
1646 goto out;
1647
1648 if (gctx->gotrootpath != 0) {
1649
1650 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1651 nd->root_fh, &nd->root_fhsize,
7b95be2a 1652 &nd->root_args, td);
984263bc
MD		 1653 if (error != 0)
1654 panic("nfs_boot: mountd root, error=%d", error);
1655
1656 if (gctx->gotswappath != 0) {
1657
1658 error = md_mount(&nd->swap_saddr,
1659 nd->swap_hostnam,
1660 nd->swap_fh, &nd->swap_fhsize,
7b95be2a 1661 &nd->swap_args, td);
984263bc
MD		 1662 if (error != 0)
1663 panic("nfs_boot: mountd swap, error=%d",
1664 error);
1665
1666 error = md_lookup_swap(&nd->swap_saddr,
1667 gctx->lookup_path,
1668 nd->swap_fh, &nd->swap_fhsize,
7b95be2a 1669 &nd->swap_args, td);
984263bc
MD		 1670 if (error != 0)
1671 panic("nfs_boot: lookup swap, error=%d",
1672 error);
1673 }
1674 nfs_diskless_valid = 3;
1675 }
1676
1677 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1678 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1679 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1680 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1681 ifctx->myaddr.sin_addr.s_addr |
1682 ~ ifctx->netmask.sin_addr.s_addr;
1683 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1684
1685out:
1686 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1687 nctx = ifctx->next;
efda3bd0 1688 kfree(ifctx, M_TEMP);
984263bc 1689 }
efda3bd0 1690 kfree(gctx, M_TEMP);
984263bc
MD		 1691}
1692
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