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kernel - Fix races created by a comedy of circumstansces (3)
[dragonfly.git] / sys / vfs / nfs / bootp_subr.c
blob8f30ca530dc9d37d5d2893cc69340b44094d0856
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 * 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 $
41 */
42
43 #include "opt_bootp.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/sockio.h>
49 #include <sys/proc.h>
50 #include <sys/malloc.h>
51 #include <sys/mount.h>
52 #include <sys/mbuf.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/sysctl.h>
56 #include <sys/uio.h>
57 #include <sys/fcntl.h>
58
59 #include <net/if.h>
60 #include <net/route.h>
61
62 #include <netinet/in.h>
63 #include <net/if_types.h>
64 #include <net/if_dl.h>
65
66 #include "rpcv2.h"
67 #include "nfsproto.h"
68 #include "nfs.h"
69 #include "nfsdiskless.h"
70 #include "krpc.h"
71 #include "xdr_subs.h"
72 #include "nfsmountrpc.h"
73
74 #define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */
75
76 #ifndef BOOTP_SETTLE_DELAY
77 #define BOOTP_SETTLE_DELAY 3
78 #endif
79
80 /*
81 * What is the longest we will wait before re-sending a request?
82 * Note this is also the frequency of "RPC timeout" messages.
83 * The re-send loop count sup linearly to this maximum, so the
84 * first complaint will happen after (1+2+3+4+5)=15 seconds.
85 */
86 #define MAX_RESEND_DELAY 5 /* seconds */
87
88 /* Definitions from RFC951 */
89 struct bootp_packet {
90 u_int8_t op;
91 u_int8_t htype;
92 u_int8_t hlen;
93 u_int8_t hops;
94 u_int32_t xid;
95 u_int16_t secs;
96 u_int16_t flags;
97 struct in_addr ciaddr;
98 struct in_addr yiaddr;
99 struct in_addr siaddr;
100 struct in_addr giaddr;
101 unsigned char chaddr[16];
102 char sname[64];
103 char file[128];
104 unsigned char vend[1222];
105 };
106
107 struct bootpc_ifcontext {
108 struct bootpc_ifcontext *next;
109 struct bootp_packet call;
110 struct bootp_packet reply;
111 int replylen;
112 int overload;
113 struct socket *so;
114 struct ifreq ireq;
115 struct ifnet *ifp;
116 struct sockaddr_dl *sdl;
117 struct sockaddr_in myaddr;
118 struct sockaddr_in netmask;
119 struct sockaddr_in gw;
120 struct sockaddr_in broadcast; /* Different for each interface */
121 int gotgw;
122 int gotnetmask;
123 int gotrootpath;
124 int outstanding;
125 int sentmsg;
126 u_int32_t xid;
127 enum {
128 IF_BOOTP_UNRESOLVED,
129 IF_BOOTP_RESOLVED,
130 IF_BOOTP_FAILED,
131 IF_DHCP_UNRESOLVED,
132 IF_DHCP_OFFERED,
133 IF_DHCP_RESOLVED,
134 IF_DHCP_FAILED,
135 } state;
136 int dhcpquerytype; /* dhcp type sent */
137 struct in_addr dhcpserver;
138 int gotdhcpserver;
139 };
140
141 #define TAG_MAXLEN 1024
142 struct bootpc_tagcontext {
143 char buf[TAG_MAXLEN + 1];
144 int overload;
145 int badopt;
146 int badtag;
147 int foundopt;
148 int taglen;
149 };
150
151 struct bootpc_globalcontext {
152 struct bootpc_ifcontext *interfaces;
153 struct bootpc_ifcontext *lastinterface;
154 u_int32_t xid;
155 int gotrootpath;
156 int gotswappath;
157 int gotgw;
158 int ifnum;
159 int secs;
160 int starttime;
161 struct bootp_packet reply;
162 int replylen;
163 struct bootpc_ifcontext *setswapfs;
164 struct bootpc_ifcontext *setrootfs;
165 struct bootpc_ifcontext *sethostname;
166 char lookup_path[24];
167 struct bootpc_tagcontext tmptag;
168 struct bootpc_tagcontext tag;
169 };
170
171 #define IPPORT_BOOTPC 68
172 #define IPPORT_BOOTPS 67
173
174 #define BOOTP_REQUEST 1
175 #define BOOTP_REPLY 2
176
177 /* Common tags */
178 #define TAG_PAD 0 /* Pad option, implicit length 1 */
179 #define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */
180 #define TAG_ROUTERS 3 /* Routers (in order of preference) */
181 #define TAG_HOSTNAME 12 /* Client host name */
182 #define TAG_ROOT 17 /* Root path */
183
184 /* DHCP specific tags */
185 #define TAG_OVERLOAD 52 /* Option Overload */
186 #define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */
187
188 #define TAG_END 255 /* End Option (i.e. no more options) */
189
190 /* Overload values */
191 #define OVERLOAD_FILE 1
192 #define OVERLOAD_SNAME 2
193
194 /* Site specific tags: */
195 #define TAG_SWAP 128
196 #define TAG_SWAPSIZE 129
197 #define TAG_ROOTOPTS 130
198 #define TAG_SWAPOPTS 131
199 #define TAG_COOKIE 134 /* ascii info for userland, exported via sysctl */
200
201 #define TAG_DHCP_MSGTYPE 53
202 #define TAG_DHCP_REQ_ADDR 50
203 #define TAG_DHCP_SERVERID 54
204 #define TAG_DHCP_LEASETIME 51
205
206 #define TAG_VENDOR_INDENTIFIER 60
207
208 #define DHCP_NOMSG 0
209 #define DHCP_DISCOVER 1
210 #define DHCP_OFFER 2
211 #define DHCP_REQUEST 3
212 #define DHCP_ACK 5
213
214 static char bootp_cookie[128];
215 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
216 bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
217
218 /* mountd RPC */
219 static void print_in_addr(struct in_addr addr);
220 static void print_sin_addr(struct sockaddr_in *addr);
221 static void clear_sinaddr(struct sockaddr_in *sin);
222 static
223 struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
224 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
225 struct bootpc_globalcontext *gctx,
226 struct thread *td);
227 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
228 struct bootp_packet *bp, int len, int tag);
229 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
230 unsigned char *start, int len, int tag);
231
232 #ifdef BOOTP_DEBUG
233 void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
234 void bootpboot_p_ma(struct sockaddr *ma);
235 void bootpboot_p_rtentry(struct rtentry *rt);
236 void bootpboot_p_tree(struct radix_node *rn);
237 void bootpboot_p_rtlist(void);
238 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
239 void bootpboot_p_iflist(void);
240 #endif
241
242 static int bootpc_call(struct bootpc_globalcontext *gctx,
243 struct thread *td);
244
245 static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
246 struct bootpc_globalcontext *gctx,
247 struct thread *td);
248
249 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
250 struct bootpc_globalcontext *gctx,
251 struct thread *td);
252
253 static void bootpc_decode_reply(struct nfsv3_diskless *nd,
254 struct bootpc_ifcontext *ifctx,
255 struct bootpc_globalcontext *gctx);
256
257 static int bootpc_received(struct bootpc_globalcontext *gctx,
258 struct bootpc_ifcontext *ifctx);
259
260 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
261 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
262 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
263
264 void bootpc_init(void);
265
266 /*
267 * In order to have multiple active interfaces with address 0.0.0.0
268 * and be able to send data to a selected interface, we perform
269 * some tricks:
270 *
271 * - The 'broadcast' address is different for each interface.
272 *
273 * - We temporarily add routing pointing 255.255.255.255 to the
274 * selected interface broadcast address, thus the packet sent
275 * goes to that interface.
276 */
277
278 #ifdef BOOTP_DEBUG
279 void
280 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
281 {
282 if (sa == NULL) {
283 kprintf("(sockaddr *) <null>");
284 return;
285 }
286 switch (sa->sa_family) {
287 case AF_INET:
288 {
289 struct sockaddr_in *sin;
290
291 sin = (struct sockaddr_in *) sa;
292 kprintf("inet ");
293 print_sin_addr(sin);
294 if (ma != NULL) {
295 sin = (struct sockaddr_in *) ma;
296 kprintf(" mask ");
297 print_sin_addr(sin);
298 }
299 }
300 break;
301 case AF_LINK:
302 {
303 struct sockaddr_dl *sli;
304 int i;
305
306 sli = (struct sockaddr_dl *) sa;
307 kprintf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
308 for (i = 0; i < sli->sdl_alen; i++) {
309 if (i > 0)
310 kprintf(":");
311 kprintf("%x", ((unsigned char *) LLADDR(sli))[i]);
312 }
313 }
314 break;
315 default:
316 kprintf("af%d", sa->sa_family);
317 }
318 }
319
320
321 void
322 bootpboot_p_ma(struct sockaddr *ma)
323 {
324 if (ma == NULL) {
325 kprintf("<null>");
326 return;
327 }
328 kprintf("%x", *(int *)ma);
329 }
330
331
332 void
333 bootpboot_p_rtentry(struct rtentry *rt)
334 {
335 bootpboot_p_sa(rt_key(rt), rt_mask(rt));
336 kprintf(" ");
337 bootpboot_p_ma(rt->rt_genmask);
338 kprintf(" ");
339 bootpboot_p_sa(rt->rt_gateway, NULL);
340 kprintf(" ");
341 kprintf("flags %x", (unsigned short) rt->rt_flags);
342 kprintf(" %d", (int) rt->rt_rmx.rmx_expire);
343 kprintf(" %s\n", if_name(rt->rt_ifp));
344 }
345
346
347 void
348 bootpboot_p_tree(struct radix_node *rn)
349 {
350 while (rn != NULL) {
351 if (rn->rn_bit < 0) {
352 if ((rn->rn_flags & RNF_ROOT) != 0) {
353 } else {
354 bootpboot_p_rtentry((struct rtentry *) rn);
355 }
356 rn = rn->rn_dupedkey;
357 } else {
358 bootpboot_p_tree(rn->rn_left);
359 bootpboot_p_tree(rn->rn_right);
360 return;
361 }
362 }
363 }
364
365
366 void
367 bootpboot_p_rtlist(void)
368 {
369 kprintf("Routing table:\n");
370 bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
371 }
372
373
374 void
375 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
376 {
377 kprintf("%s flags %x, addr ",
378 if_name(ifp),
379 (unsigned short) ifp->if_flags);
380 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
381 kprintf(", broadcast ");
382 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
383 kprintf(", netmask ");
384 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
385 kprintf("\n");
386 }
387
388
389 void
390 bootpboot_p_iflist(void)
391 {
392 struct ifnet *ifp;
393 struct ifaddr_container *ifac;
394
395 kprintf("Interface list:\n");
396 ifnet_lock();
397 TAILQ_FOREACH(ifp, &ifnetlist, if_link) {
398 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
399 struct ifaddr *ifa = ifac->ifa;
400
401 if (ifa->ifa_addr->sa_family == AF_INET)
402 bootpboot_p_if(ifp, ifa);
403 }
404 }
405 ifnet_unlock();
406 }
407 #endif /* defined(BOOTP_DEBUG) */
408
409
410 static void
411 clear_sinaddr(struct sockaddr_in *sin)
412 {
413 bzero(sin, sizeof(*sin));
414 sin->sin_len = sizeof(*sin);
415 sin->sin_family = AF_INET;
416 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
417 sin->sin_port = 0;
418 }
419
420
421 static struct bootpc_ifcontext *
422 allocifctx(struct bootpc_globalcontext *gctx)
423 {
424 struct bootpc_ifcontext *ifctx;
425 ifctx = (struct bootpc_ifcontext *) kmalloc(sizeof(*ifctx),
426 M_TEMP, M_WAITOK);
427 bzero(ifctx, sizeof(*ifctx));
428 ifctx->xid = gctx->xid;
429 #ifdef BOOTP_NO_DHCP
430 ifctx->state = IF_BOOTP_UNRESOLVED;
431 #else
432 ifctx->state = IF_DHCP_UNRESOLVED;
433 #endif
434 gctx->xid += 0x100;
435 return ifctx;
436 }
437
438
439 static __inline int
440 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
441 {
442 if (ifctx->state == IF_BOOTP_RESOLVED ||
443 ifctx->state == IF_DHCP_RESOLVED)
444 return 1;
445 return 0;
446 }
447
448
449 static __inline int
450 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
451 {
452 if (ifctx->state == IF_BOOTP_UNRESOLVED ||
453 ifctx->state == IF_DHCP_UNRESOLVED)
454 return 1;
455 return 0;
456 }
457
458
459 static __inline int
460 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
461 {
462 if (ifctx->state == IF_BOOTP_FAILED ||
463 ifctx->state == IF_DHCP_FAILED)
464 return 1;
465 return 0;
466 }
467
468
469 static int
470 bootpc_received(struct bootpc_globalcontext *gctx,
471 struct bootpc_ifcontext *ifctx)
472 {
473 unsigned char dhcpreplytype;
474 char *p;
475 /*
476 * Need timeout for fallback to less
477 * desirable alternative.
478 */
479
480
481 /* This call used for the side effect (badopt flag) */
482 (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
483 gctx->replylen,
484 TAG_END);
485
486 /* If packet is invalid, ignore it */
487 if (gctx->tmptag.badopt != 0)
488 return 0;
489
490 p = bootpc_tag(&gctx->tmptag, &gctx->reply,
491 gctx->replylen, TAG_DHCP_MSGTYPE);
492 if (p != NULL)
493 dhcpreplytype = *p;
494 else
495 dhcpreplytype = DHCP_NOMSG;
496
497 switch (ifctx->dhcpquerytype) {
498 case DHCP_DISCOVER:
499 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */
500 #ifndef BOOTP_FORCE_DHCP
501 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */
502 #endif
503 )
504 return 0;
505 break;
506 case DHCP_REQUEST:
507 if (dhcpreplytype != DHCP_ACK)
508 return 0;
509 /* fall through */
510 case DHCP_NOMSG:
511 break;
512 }
513
514
515 /* Ignore packet unless it gives us a root tag we didn't have */
516
517 if ((ifctx->state == IF_BOOTP_RESOLVED ||
518 (ifctx->dhcpquerytype == DHCP_DISCOVER &&
519 (ifctx->state == IF_DHCP_OFFERED ||
520 ifctx->state == IF_DHCP_RESOLVED))) &&
521 (bootpc_tag(&gctx->tmptag, &ifctx->reply,
522 ifctx->replylen,
523 TAG_ROOT) != NULL ||
524 bootpc_tag(&gctx->tmptag, &gctx->reply,
525 gctx->replylen,
526 TAG_ROOT) == NULL))
527 return 0;
528
529 bcopy(&gctx->reply,
530 &ifctx->reply,
531 gctx->replylen);
532 ifctx->replylen = gctx->replylen;
533
534 /* XXX: Only reset if 'perfect' response */
535 if (ifctx->state == IF_BOOTP_UNRESOLVED)
536 ifctx->state = IF_BOOTP_RESOLVED;
537 else if (ifctx->state == IF_DHCP_UNRESOLVED &&
538 ifctx->dhcpquerytype == DHCP_DISCOVER) {
539 if (dhcpreplytype == DHCP_OFFER)
540 ifctx->state = IF_DHCP_OFFERED;
541 else
542 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */
543 } else if (ifctx->state == IF_DHCP_OFFERED &&
544 ifctx->dhcpquerytype == DHCP_REQUEST)
545 ifctx->state = IF_DHCP_RESOLVED;
546
547
548 if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
549 ifctx->state != IF_BOOTP_RESOLVED) {
550 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
551 ifctx->replylen, TAG_DHCP_SERVERID);
552 if (p != NULL && gctx->tmptag.taglen == 4) {
553 memcpy(&ifctx->dhcpserver, p, 4);
554 ifctx->gotdhcpserver = 1;
555 } else
556 ifctx->gotdhcpserver = 0;
557 return 1;
558 }
559
560 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
561 ifctx->replylen,
562 TAG_ROOT) != NULL);
563 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
564 ifctx->replylen,
565 TAG_ROUTERS) != NULL);
566 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
567 ifctx->replylen,
568 TAG_SUBNETMASK) != NULL);
569 return 1;
570 }
571
572 static int
573 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
574 {
575 struct socket *so;
576 struct sockaddr_in *sin, dst;
577 struct uio auio;
578 struct sockopt sopt;
579 struct iovec aio;
580 int error, on, rcvflg, timo, len;
581 time_t atimo;
582 time_t rtimo;
583 struct timeval tv;
584 struct bootpc_ifcontext *ifctx;
585 int outstanding;
586 int gotrootpath;
587 int retry;
588 const char *s;
589 char hexstr[64];
590
591 /*
592 * Create socket and set its recieve timeout.
593 */
594 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
595 if (error != 0)
596 goto out;
597
598 tv.tv_sec = 1;
599 tv.tv_usec = 0;
600 bzero(&sopt, sizeof(sopt));
601 sopt.sopt_level = SOL_SOCKET;
602 sopt.sopt_name = SO_RCVTIMEO;
603 sopt.sopt_val = &tv;
604 sopt.sopt_valsize = sizeof tv;
605
606 error = sosetopt(so, &sopt);
607 if (error != 0)
608 goto out;
609
610 /*
611 * Enable broadcast.
612 */
613 on = 1;
614 sopt.sopt_name = SO_BROADCAST;
615 sopt.sopt_val = &on;
616 sopt.sopt_valsize = sizeof on;
617
618 error = sosetopt(so, &sopt);
619 if (error != 0)
620 goto out;
621
622 /*
623 * Disable routing.
624 */
625
626 on = 1;
627 sopt.sopt_name = SO_DONTROUTE;
628 sopt.sopt_val = &on;
629 sopt.sopt_valsize = sizeof on;
630
631 error = sosetopt(so, &sopt);
632 if (error != 0)
633 goto out;
634
635 /*
636 * Bind the local endpoint to a bootp client port.
637 */
638 sin = &dst;
639 clear_sinaddr(sin);
640 sin->sin_port = htons(IPPORT_BOOTPC);
641 error = sobind(so, (struct sockaddr *)sin, td);
642 if (error != 0) {
643 kprintf("bind failed\n");
644 goto out;
645 }
646
647 /*
648 * Setup socket address for the server.
649 */
650 sin = &dst;
651 clear_sinaddr(sin);
652 sin->sin_addr.s_addr = INADDR_BROADCAST;
653 sin->sin_port = htons(IPPORT_BOOTPS);
654
655 /*
656 * Send it, repeatedly, until a reply is received,
657 * but delay each re-send by an increasing amount.
658 * If the delay hits the maximum, start complaining.
659 */
660 timo = 0;
661 rtimo = 0;
662 for (;;) {
663
664 outstanding = 0;
665 gotrootpath = 0;
666
667 for (ifctx = gctx->interfaces;
668 ifctx != NULL;
669 ifctx = ifctx->next) {
670 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
671 bootpc_tag(&gctx->tmptag, &ifctx->reply,
672 ifctx->replylen,
673 TAG_ROOT) != NULL)
674 gotrootpath = 1;
675 }
676
677 for (ifctx = gctx->interfaces;
678 ifctx != NULL;
679 ifctx = ifctx->next) {
680 ifctx->outstanding = 0;
681 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
682 gotrootpath != 0) {
683 continue;
684 }
685 if (bootpc_ifctx_isfailed(ifctx) != 0)
686 continue;
687
688 outstanding++;
689 ifctx->outstanding = 1;
690
691 /* Proceed to next step in DHCP negotiation */
692 if ((ifctx->state == IF_DHCP_OFFERED &&
693 ifctx->dhcpquerytype != DHCP_REQUEST) ||
694 (ifctx->state == IF_DHCP_UNRESOLVED &&
695 ifctx->dhcpquerytype != DHCP_DISCOVER) ||
696 (ifctx->state == IF_BOOTP_UNRESOLVED &&
697 ifctx->dhcpquerytype != DHCP_NOMSG)) {
698 ifctx->sentmsg = 0;
699 bootpc_compose_query(ifctx, gctx, td);
700 }
701
702 /* Send BOOTP request (or re-send). */
703
704 if (ifctx->sentmsg == 0) {
705 switch(ifctx->dhcpquerytype) {
706 case DHCP_DISCOVER:
707 s = "DHCP Discover";
708 break;
709 case DHCP_REQUEST:
710 s = "DHCP Request";
711 break;
712 case DHCP_NOMSG:
713 default:
714 s = "BOOTP Query";
715 break;
716 }
717 hexncpy((u_char *)LLADDR(ifctx->sdl),
718 ifctx->sdl->sdl_alen, hexstr,
719 HEX_NCPYLEN(ifctx->sdl->sdl_alen), ":");
720 kprintf("Sending %s packet from "
721 "interface %s (%s)\n",
722 s, ifctx->ireq.ifr_name,
723 hexstr);
724 ifctx->sentmsg = 1;
725 }
726
727 aio.iov_base = (caddr_t) &ifctx->call;
728 aio.iov_len = sizeof(ifctx->call);
729
730 auio.uio_iov = &aio;
731 auio.uio_iovcnt = 1;
732 auio.uio_segflg = UIO_SYSSPACE;
733 auio.uio_rw = UIO_WRITE;
734 auio.uio_offset = 0;
735 auio.uio_resid = sizeof(ifctx->call);
736 auio.uio_td = td;
737
738 /* Set netmask to 0.0.0.0 */
739
740 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
741 clear_sinaddr(sin);
742 error = ifioctl(ifctx->so, SIOCSIFNETMASK,
743 (caddr_t) &ifctx->ireq, proc0.p_ucred);
744 if (error != 0)
745 panic("bootpc_call:"
746 "set if netmask, error=%d",
747 error);
748
749 error = sosend(so, (struct sockaddr *) &dst,
750 &auio, NULL, NULL, 0, td);
751 if (error != 0) {
752 kprintf("bootpc_call: sosend: %d state %08x\n",
753 error, (int) so->so_state);
754 }
755
756 /* XXX: Is this needed ? */
757 tsleep(&error, 0, "bootpw", 10);
758
759 /* Set netmask to 255.0.0.0 */
760
761 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
762 clear_sinaddr(sin);
763 sin->sin_addr.s_addr = htonl(0xff000000u);
764 error = ifioctl(ifctx->so, SIOCSIFNETMASK,
765 (caddr_t) &ifctx->ireq, proc0.p_ucred);
766 if (error != 0)
767 panic("bootpc_call:"
768 "set if netmask, error=%d",
769 error);
770
771 }
772
773 if (outstanding == 0 &&
774 (rtimo == 0 || time_uptime >= rtimo)) {
775 error = 0;
776 goto gotreply;
777 }
778
779 /* Determine new timeout. */
780 if (timo < MAX_RESEND_DELAY)
781 timo++;
782 else {
783 kprintf("DHCP/BOOTP timeout for server ");
784 print_sin_addr(&dst);
785 kprintf("\n");
786 }
787
788 /*
789 * Wait for up to timo seconds for a reply.
790 * The socket receive timeout was set to 1 second.
791 */
792 atimo = timo + time_uptime;
793 while (time_uptime < atimo) {
794 aio.iov_base = (caddr_t) &gctx->reply;
795 aio.iov_len = sizeof(gctx->reply);
796
797 auio.uio_iov = &aio;
798 auio.uio_iovcnt = 1;
799 auio.uio_segflg = UIO_SYSSPACE;
800 auio.uio_rw = UIO_READ;
801 auio.uio_offset = 0;
802 auio.uio_resid = sizeof(gctx->reply);
803 auio.uio_td = td;
804
805 rcvflg = 0;
806 error = soreceive(so, NULL, &auio,
807 NULL, NULL, &rcvflg);
808 gctx->secs = time_uptime - gctx->starttime;
809 for (ifctx = gctx->interfaces;
810 ifctx != NULL;
811 ifctx = ifctx->next) {
812 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
813 bootpc_ifctx_isfailed(ifctx) != 0)
814 continue;
815
816 ifctx->call.secs = htons(gctx->secs);
817 }
818 if (error == EWOULDBLOCK)
819 continue;
820 if (error != 0)
821 goto out;
822 len = sizeof(gctx->reply) - auio.uio_resid;
823
824 /* Do we have the required number of bytes ? */
825 if (len < BOOTP_MIN_LEN)
826 continue;
827 gctx->replylen = len;
828
829 /* Is it a reply? */
830 if (gctx->reply.op != BOOTP_REPLY)
831 continue;
832
833 /* Is this an answer to our query */
834 for (ifctx = gctx->interfaces;
835 ifctx != NULL;
836 ifctx = ifctx->next) {
837 if (gctx->reply.xid != ifctx->call.xid)
838 continue;
839
840 /* Same HW address size ? */
841 if (gctx->reply.hlen != ifctx->call.hlen)
842 continue;
843
844 /* Correct HW address ? */
845 if (bcmp(gctx->reply.chaddr,
846 ifctx->call.chaddr,
847 ifctx->call.hlen) != 0)
848 continue;
849
850 break;
851 }
852
853 if (ifctx != NULL) {
854 s = bootpc_tag(&gctx->tmptag,
855 &gctx->reply,
856 gctx->replylen,
857 TAG_DHCP_MSGTYPE);
858 if (s != NULL) {
859 switch (*s) {
860 case DHCP_OFFER:
861 s = "DHCP Offer";
862 break;
863 case DHCP_ACK:
864 s = "DHCP Ack";
865 break;
866 default:
867 s = "DHCP (unexpected)";
868 break;
869 }
870 } else
871 s = "BOOTP Reply";
872
873 kprintf("Received %s packet"
874 " on %s from ",
875 s,
876 ifctx->ireq.ifr_name);
877 print_in_addr(gctx->reply.siaddr);
878 if (gctx->reply.giaddr.s_addr !=
879 htonl(INADDR_ANY)) {
880 kprintf(" via ");
881 print_in_addr(gctx->reply.giaddr);
882 }
883 if (bootpc_received(gctx, ifctx) != 0) {
884 kprintf(" (accepted)");
885 if (ifctx->outstanding) {
886 ifctx->outstanding = 0;
887 outstanding--;
888 }
889 /* Network settle delay */
890 if (outstanding == 0)
891 atimo = time_uptime +
892 BOOTP_SETTLE_DELAY;
893 } else
894 kprintf(" (ignored)");
895 if (ifctx->gotrootpath) {
896 gotrootpath = 1;
897 rtimo = time_uptime +
898 BOOTP_SETTLE_DELAY;
899 kprintf(" (got root path)");
900 } else
901 kprintf(" (no root path)");
902 kprintf("\n");
903 }
904 } /* while secs */
905 #ifdef BOOTP_TIMEOUT
906 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
907 break;
908 #endif
909 /* Force a retry if halfway in DHCP negotiation */
910 retry = 0;
911 for (ifctx = gctx->interfaces; ifctx != NULL;
912 ifctx = ifctx->next) {
913 if (ifctx->state == IF_DHCP_OFFERED) {
914 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
915 retry = 1;
916 else
917 ifctx->state = IF_DHCP_UNRESOLVED;
918 }
919 }
920
921 if (retry != 0)
922 continue;
923
924 if (gotrootpath != 0) {
925 gctx->gotrootpath = gotrootpath;
926 if (rtimo != 0 && time_uptime >= rtimo)
927 break;
928 }
929 } /* forever send/receive */
930
931 /*
932 * XXX: These are errors of varying seriousness being silently
933 * ignored
934 */
935
936 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
937 if (bootpc_ifctx_isresolved(ifctx) == 0) {
938 kprintf("%s timeout for interface %s\n",
939 ifctx->dhcpquerytype != DHCP_NOMSG ?
940 "DHCP" : "BOOTP",
941 ifctx->ireq.ifr_name);
942 }
943 }
944 if (gctx->gotrootpath != 0) {
945 #if 0
946 kprintf("Got a root path, ignoring remaining timeout\n");
947 #endif
948 error = 0;
949 goto out;
950 }
951 #ifndef BOOTP_NFSROOT
952 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
953 if (bootpc_ifctx_isresolved(ifctx) != 0) {
954 error = 0;
955 goto out;
956 }
957 }
958 #endif
959 error = ETIMEDOUT;
960 goto out;
961
962 gotreply:
963 out:
964 soclose(so, FNONBLOCK);
965 return error;
966 }
967
968
969 static int
970 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
971 struct bootpc_globalcontext *gctx,
972 struct thread *td)
973 {
974 struct ifaddr_container *ifac;
975 struct sockaddr_in *sin;
976 int error;
977
978 struct ifreq *ireq;
979 struct socket *so;
980 struct sockaddr_dl *sdl;
981
982 error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
983 if (error != 0)
984 panic("nfs_boot: socreate, error=%d", error);
985
986 ireq = &ifctx->ireq;
987 so = ifctx->so;
988
989 /*
990 * Bring up the interface.
991 *
992 * Get the old interface flags and or IFF_UP into them; if
993 * IFF_UP set blindly, interface selection can be clobbered.
994 */
995 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
996 if (error != 0)
997 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
998 ireq->ifr_flags |= IFF_UP;
999 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1000 if (error != 0)
1001 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1002
1003 /*
1004 * Do enough of ifconfig(8) so that the chosen interface
1005 * can talk to the servers. (just set the address)
1006 */
1007
1008 /* addr is 0.0.0.0 */
1009
1010 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1011 clear_sinaddr(sin);
1012 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1013 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1014 panic("bootpc_fakeup_interface: "
1015 "set if addr, error=%d", error);
1016
1017 /* netmask is 255.0.0.0 */
1018
1019 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1020 clear_sinaddr(sin);
1021 sin->sin_addr.s_addr = htonl(0xff000000u);
1022 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
1023 if (error != 0)
1024 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1025 error);
1026
1027 /* Broadcast is 255.255.255.255 */
1028
1029 sin = (struct sockaddr_in *)&ireq->ifr_addr;
1030 clear_sinaddr(sin);
1031 clear_sinaddr(&ifctx->broadcast);
1032 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1033 ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1034
1035 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
1036 if (error != 0 && error != EADDRNOTAVAIL)
1037 panic("bootpc_fakeup_interface: "
1038 "set if broadcast addr, error=%d",
1039 error);
1040 error = 0;
1041
1042 /* Get HW address */
1043
1044 sdl = NULL;
1045 TAILQ_FOREACH(ifac, &ifctx->ifp->if_addrheads[mycpuid], ifa_link) {
1046 struct ifaddr *ifa = ifac->ifa;
1047
1048 if (ifa->ifa_addr->sa_family == AF_LINK &&
1049 (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1050 sdl->sdl_type == IFT_ETHER)
1051 break;
1052 }
1053
1054 if (sdl == NULL)
1055 panic("bootpc: Unable to find HW address for %s",
1056 ifctx->ireq.ifr_name);
1057 ifctx->sdl = sdl;
1058
1059 return error;
1060 }
1061
1062
1063 static int
1064 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1065 struct bootpc_globalcontext *gctx,
1066 struct thread *td)
1067 {
1068 int error;
1069 struct sockaddr_in defdst;
1070 struct sockaddr_in defmask;
1071 struct sockaddr_in *sin;
1072
1073 struct ifreq *ireq;
1074 struct socket *so;
1075 struct sockaddr_in *myaddr;
1076 struct sockaddr_in *netmask;
1077 struct sockaddr_in *gw;
1078
1079 ireq = &ifctx->ireq;
1080 so = ifctx->so;
1081 myaddr = &ifctx->myaddr;
1082 netmask = &ifctx->netmask;
1083 gw = &ifctx->gw;
1084
1085 if (bootpc_ifctx_isresolved(ifctx) == 0) {
1086
1087 /* Shutdown interfaces where BOOTP failed */
1088
1089 kprintf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1090 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1091 if (error != 0)
1092 panic("bootpc_adjust_interface: "
1093 "SIOCGIFFLAGS, error=%d", error);
1094 ireq->ifr_flags &= ~IFF_UP;
1095 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1096 if (error != 0)
1097 panic("bootpc_adjust_interface: "
1098 "SIOCSIFFLAGS, error=%d", error);
1099
1100 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1101 clear_sinaddr(sin);
1102 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
1103 if (error != 0 && (error != EADDRNOTAVAIL ||
1104 ifctx == gctx->interfaces))
1105 panic("bootpc_adjust_interface: "
1106 "SIOCDIFADDR, error=%d", error);
1107
1108 return 0;
1109 }
1110
1111 kprintf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1112 /*
1113 * Do enough of ifconfig(8) so that the chosen interface
1114 * can talk to the servers. (just set the address)
1115 */
1116 bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1117 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
1118 if (error != 0)
1119 panic("bootpc_adjust_interface: "
1120 "set if netmask, error=%d", error);
1121
1122 /* Broadcast is with host part of IP address all 1's */
1123
1124 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1125 clear_sinaddr(sin);
1126 sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1127 ~ netmask->sin_addr.s_addr;
1128 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
1129 if (error != 0)
1130 panic("bootpc_adjust_interface: "
1131 "set if broadcast addr, error=%d", error);
1132
1133 bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1134 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1135 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1136 panic("bootpc_adjust_interface: "
1137 "set if addr, error=%d", error);
1138
1139 /* Add new default route */
1140
1141 if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1142 clear_sinaddr(&defdst);
1143 clear_sinaddr(&defmask);
1144 error = rtrequest_global(RTM_ADD, (struct sockaddr *) &defdst,
1145 (struct sockaddr *) gw,
1146 (struct sockaddr *) &defmask,
1147 (RTF_UP | RTF_GATEWAY | RTF_STATIC));
1148 if (error != 0) {
1149 kprintf("bootpc_adjust_interface: "
1150 "add net route, error=%d\n", error);
1151 return error;
1152 }
1153 }
1154
1155 return 0;
1156 }
1157
1158 static void
1159 print_sin_addr(struct sockaddr_in *sin)
1160 {
1161 print_in_addr(sin->sin_addr);
1162 }
1163
1164
1165 static void
1166 print_in_addr(struct in_addr addr)
1167 {
1168 unsigned int ip;
1169
1170 ip = ntohl(addr.s_addr);
1171 kprintf("%d.%d.%d.%d",
1172 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1173 }
1174
1175 static void
1176 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1177 struct bootpc_globalcontext *gctx, struct thread *td)
1178 {
1179 unsigned char *vendp;
1180 unsigned char vendor_client[64];
1181 uint32_t leasetime;
1182 uint8_t vendor_client_len;
1183
1184 ifctx->gotrootpath = 0;
1185
1186 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1187
1188 /* bootpc part */
1189 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */
1190 ifctx->call.htype = 1; /* 10mb ethernet */
1191 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1192 ifctx->call.hops = 0;
1193 if (bootpc_ifctx_isunresolved(ifctx) != 0)
1194 ifctx->xid++;
1195 ifctx->call.xid = txdr_unsigned(ifctx->xid);
1196 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1197
1198 vendp = ifctx->call.vend;
1199 *vendp++ = 99; /* RFC1048 cookie */
1200 *vendp++ = 130;
1201 *vendp++ = 83;
1202 *vendp++ = 99;
1203 *vendp++ = TAG_MAXMSGSIZE;
1204 *vendp++ = 2;
1205 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1206 *vendp++ = sizeof(struct bootp_packet) & 255;
1207
1208 ksnprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1209 ostype, MACHINE, osrelease);
1210 vendor_client_len = strlen(vendor_client);
1211 *vendp++ = TAG_VENDOR_INDENTIFIER;
1212 *vendp++ = vendor_client_len;
1213 memcpy(vendp, vendor_client, vendor_client_len);
1214 vendp += vendor_client_len;
1215 ifctx->dhcpquerytype = DHCP_NOMSG;
1216 switch (ifctx->state) {
1217 case IF_DHCP_UNRESOLVED:
1218 *vendp++ = TAG_DHCP_MSGTYPE;
1219 *vendp++ = 1;
1220 *vendp++ = DHCP_DISCOVER;
1221 ifctx->dhcpquerytype = DHCP_DISCOVER;
1222 ifctx->gotdhcpserver = 0;
1223 break;
1224 case IF_DHCP_OFFERED:
1225 *vendp++ = TAG_DHCP_MSGTYPE;
1226 *vendp++ = 1;
1227 *vendp++ = DHCP_REQUEST;
1228 ifctx->dhcpquerytype = DHCP_REQUEST;
1229 *vendp++ = TAG_DHCP_REQ_ADDR;
1230 *vendp++ = 4;
1231 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1232 vendp += 4;
1233 if (ifctx->gotdhcpserver != 0) {
1234 *vendp++ = TAG_DHCP_SERVERID;
1235 *vendp++ = 4;
1236 memcpy(vendp, &ifctx->dhcpserver, 4);
1237 vendp += 4;
1238 }
1239 *vendp++ = TAG_DHCP_LEASETIME;
1240 *vendp++ = 4;
1241 leasetime = htonl(300);
1242 memcpy(vendp, &leasetime, 4);
1243 vendp += 4;
1244 default:
1245 ;
1246 }
1247 *vendp = TAG_END;
1248
1249 ifctx->call.secs = 0;
1250 ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1251 }
1252
1253
1254 static int
1255 bootpc_hascookie(struct bootp_packet *bp)
1256 {
1257 return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1258 bp->vend[2] == 83 && bp->vend[3] == 99);
1259 }
1260
1261
1262 static void
1263 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1264 unsigned char *start, int len, int tag)
1265 {
1266 unsigned char *j;
1267 unsigned char *ej;
1268 unsigned char code;
1269
1270 if (tctx->badtag != 0 || tctx->badopt != 0)
1271 return;
1272
1273 j = start;
1274 ej = j + len;
1275
1276 while (j < ej) {
1277 code = *j++;
1278 if (code == TAG_PAD)
1279 continue;
1280 if (code == TAG_END)
1281 return;
1282 if (j >= ej || j + *j + 1 > ej) {
1283 tctx->badopt = 1;
1284 return;
1285 }
1286 len = *j++;
1287 if (code == tag) {
1288 if (tctx->taglen + len > TAG_MAXLEN) {
1289 tctx->badtag = 1;
1290 return;
1291 }
1292 tctx->foundopt = 1;
1293 if (len > 0)
1294 memcpy(tctx->buf + tctx->taglen,
1295 j, len);
1296 tctx->taglen += len;
1297 }
1298 if (code == TAG_OVERLOAD)
1299 tctx->overload = *j;
1300
1301 j += len;
1302 }
1303 }
1304
1305
1306 static unsigned char *
1307 bootpc_tag(struct bootpc_tagcontext *tctx, struct bootp_packet *bp,
1308 int len, int tag)
1309 {
1310 tctx->overload = 0;
1311 tctx->badopt = 0;
1312 tctx->badtag = 0;
1313 tctx->foundopt = 0;
1314 tctx->taglen = 0;
1315
1316 if (bootpc_hascookie(bp) == 0)
1317 return NULL;
1318
1319 bootpc_tag_helper(tctx, &bp->vend[4],
1320 (unsigned char *) bp + len - &bp->vend[4], tag);
1321
1322 if ((tctx->overload & OVERLOAD_FILE) != 0)
1323 bootpc_tag_helper(tctx,
1324 (unsigned char *) bp->file,
1325 sizeof(bp->file),
1326 tag);
1327 if ((tctx->overload & OVERLOAD_SNAME) != 0)
1328 bootpc_tag_helper(tctx,
1329 (unsigned char *) bp->sname,
1330 sizeof(bp->sname),
1331 tag);
1332
1333 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1334 return NULL;
1335 tctx->buf[tctx->taglen] = '\0';
1336 return tctx->buf;
1337 }
1338
1339
1340 static void
1341 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1342 struct bootpc_globalcontext *gctx)
1343 {
1344 char *p;
1345 unsigned int ip;
1346
1347 ifctx->gotgw = 0;
1348 ifctx->gotnetmask = 0;
1349
1350 clear_sinaddr(&ifctx->myaddr);
1351 clear_sinaddr(&ifctx->netmask);
1352 clear_sinaddr(&ifctx->gw);
1353
1354 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1355
1356 ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1357 ksnprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1358 "swap.%d.%d.%d.%d",
1359 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1360
1361 kprintf("%s at ", ifctx->ireq.ifr_name);
1362 print_sin_addr(&ifctx->myaddr);
1363 kprintf(" server ");
1364 print_in_addr(ifctx->reply.siaddr);
1365
1366 ifctx->gw.sin_addr = ifctx->reply.giaddr;
1367 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1368 kprintf(" via gateway ");
1369 print_in_addr(ifctx->reply.giaddr);
1370 }
1371
1372 /* This call used for the side effect (overload flag) */
1373 (void) bootpc_tag(&gctx->tmptag,
1374 &ifctx->reply, ifctx->replylen, TAG_END);
1375
1376 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1377 if (ifctx->reply.sname[0] != '\0')
1378 kprintf(" server name %s", ifctx->reply.sname);
1379 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1380 if (ifctx->reply.file[0] != '\0')
1381 kprintf(" boot file %s", ifctx->reply.file);
1382
1383 kprintf("\n");
1384
1385 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1386 TAG_SUBNETMASK);
1387 if (p != NULL) {
1388 if (gctx->tag.taglen != 4)
1389 panic("bootpc: subnet mask len is %d",
1390 gctx->tag.taglen);
1391 bcopy(p, &ifctx->netmask.sin_addr, 4);
1392 ifctx->gotnetmask = 1;
1393 kprintf("subnet mask ");
1394 print_sin_addr(&ifctx->netmask);
1395 kprintf(" ");
1396 }
1397
1398 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1399 TAG_ROUTERS);
1400 if (p != NULL) {
1401 /* Routers */
1402 if (gctx->tag.taglen % 4)
1403 panic("bootpc: Router Len is %d", gctx->tag.taglen);
1404 if (gctx->tag.taglen > 0) {
1405 bcopy(p, &ifctx->gw.sin_addr, 4);
1406 kprintf("router ");
1407 print_sin_addr(&ifctx->gw);
1408 kprintf(" ");
1409 ifctx->gotgw = 1;
1410 gctx->gotgw = 1;
1411 }
1412 }
1413
1414 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1415 TAG_ROOT);
1416 if (p != NULL) {
1417 if (gctx->setrootfs != NULL) {
1418 kprintf("rootfs %s (ignored) ", p);
1419 } else if (setfs(&nd->root_saddr,
1420 nd->root_hostnam, p)) {
1421 kprintf("rootfs %s ",p);
1422 gctx->gotrootpath = 1;
1423 ifctx->gotrootpath = 1;
1424 gctx->setrootfs = ifctx;
1425
1426 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1427 ifctx->replylen,
1428 TAG_ROOTOPTS);
1429 if (p != NULL) {
1430 nfs_mountopts(&nd->root_args, p);
1431 kprintf("rootopts %s ", p);
1432 }
1433 } else
1434 panic("Failed to set rootfs to %s",p);
1435 }
1436
1437 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1438 TAG_SWAP);
1439 if (p != NULL) {
1440 if (gctx->setswapfs != NULL) {
1441 kprintf("swapfs %s (ignored) ", p);
1442 } else if (setfs(&nd->swap_saddr,
1443 nd->swap_hostnam, p)) {
1444 gctx->gotswappath = 1;
1445 gctx->setswapfs = ifctx;
1446 kprintf("swapfs %s ", p);
1447
1448 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1449 ifctx->replylen,
1450 TAG_SWAPOPTS);
1451 if (p != NULL) {
1452 /* swap mount options */
1453 nfs_mountopts(&nd->swap_args, p);
1454 kprintf("swapopts %s ", p);
1455 }
1456
1457 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1458 ifctx->replylen,
1459 TAG_SWAPSIZE);
1460 if (p != NULL) {
1461 int swaplen;
1462 if (gctx->tag.taglen != 4)
1463 panic("bootpc: "
1464 "Expected 4 bytes for swaplen, "
1465 "not %d bytes",
1466 gctx->tag.taglen);
1467 bcopy(p, &swaplen, 4);
1468 nd->swap_nblks = ntohl(swaplen);
1469 kprintf("swapsize %d KB ",
1470 nd->swap_nblks);
1471 }
1472 } else
1473 panic("Failed to set swapfs to %s", p);
1474 }
1475
1476 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1477 TAG_HOSTNAME);
1478 if (p != NULL) {
1479 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1480 panic("bootpc: hostname >= %d bytes",
1481 MAXHOSTNAMELEN);
1482 if (gctx->sethostname != NULL) {
1483 kprintf("hostname %s (ignored) ", p);
1484 } else {
1485 strcpy(nd->my_hostnam, p);
1486 strcpy(hostname, p);
1487 kprintf("hostname %s ",hostname);
1488 gctx->sethostname = ifctx;
1489 }
1490 }
1491 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1492 TAG_COOKIE);
1493 if (p != NULL) { /* store in a sysctl variable */
1494 int i, l = sizeof(bootp_cookie) - 1;
1495 for (i = 0; i < l && p[i] != '\0'; i++)
1496 bootp_cookie[i] = p[i];
1497 p[i] = '\0';
1498 }
1499
1500 kprintf("\n");
1501
1502 if (ifctx->gotnetmask == 0) {
1503 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1504 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1505 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1506 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1507 else
1508 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1509 }
1510 if (ifctx->gotgw == 0) {
1511 /* Use proxyarp */
1512 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1513 }
1514 }
1515
1516 void
1517 bootpc_init(void)
1518 {
1519 struct bootpc_ifcontext *ifctx, *nctx; /* Interface BOOTP contexts */
1520 struct bootpc_globalcontext *gctx; /* Global BOOTP context */
1521 struct ifnet *ifp;
1522 int error;
1523 struct nfsv3_diskless *nd;
1524 struct thread *td;
1525
1526 nd = &nfsv3_diskless;
1527 td = curthread;
1528
1529 /*
1530 * If already filled in, don't touch it here
1531 */
1532 if (nfs_diskless_valid != 0)
1533 return;
1534
1535 gctx = kmalloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1536
1537 gctx->xid = ~0xFFFF;
1538 gctx->starttime = time_uptime;
1539
1540 ifctx = allocifctx(gctx);
1541
1542 /*
1543 * Find a network interface.
1544 */
1545 #ifdef BOOTP_WIRED_TO
1546 kprintf("bootpc_init: wired to interface '%s'\n",
1547 __XSTRING(BOOTP_WIRED_TO));
1548 #endif
1549 bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1550 /* XXX ALMOST MPSAFE */
1551 ifnet_lock();
1552 TAILQ_FOREACH(ifp, &ifnetlist, if_link) {
1553 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1554 sizeof(ifctx->ireq.ifr_name));
1555 #ifdef BOOTP_WIRED_TO
1556 if (strcmp(ifctx->ireq.ifr_name,
1557 __XSTRING(BOOTP_WIRED_TO)) != 0)
1558 continue;
1559 #else
1560 if ((ifp->if_flags &
1561 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1562 IFF_BROADCAST)
1563 continue;
1564 #endif
1565 if (gctx->interfaces != NULL)
1566 gctx->lastinterface->next = ifctx;
1567 else
1568 gctx->interfaces = ifctx;
1569 ifctx->ifp = ifp;
1570 gctx->lastinterface = ifctx;
1571 ifctx = allocifctx(gctx);
1572 }
1573 ifnet_unlock();
1574 kfree(ifctx, M_TEMP);
1575
1576 if (gctx->interfaces == NULL) {
1577 #ifdef BOOTP_WIRED_TO
1578 panic("bootpc_init: Could not find interface specified "
1579 "by BOOTP_WIRED_TO: "
1580 __XSTRING(BOOTP_WIRED_TO));
1581 #else
1582 panic("bootpc_init: no suitable interface");
1583 #endif
1584 }
1585
1586 gctx->gotrootpath = 0;
1587 gctx->gotswappath = 0;
1588 gctx->gotgw = 0;
1589
1590 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1591 bootpc_fakeup_interface(ifctx, gctx, td);
1592
1593 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1594 bootpc_compose_query(ifctx, gctx, td);
1595
1596 ifctx = gctx->interfaces;
1597 error = bootpc_call(gctx, td);
1598
1599 if (error != 0) {
1600 #ifdef BOOTP_NFSROOT
1601 panic("BOOTP call failed");
1602 #else
1603 kprintf("BOOTP call failed\n");
1604 #endif
1605 }
1606
1607 nfs_mountopts(&nd->root_args, NULL);
1608
1609 nfs_mountopts(&nd->swap_args, NULL);
1610
1611 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1612 if (bootpc_ifctx_isresolved(ifctx) != 0)
1613 bootpc_decode_reply(nd, ifctx, gctx);
1614
1615 if (gctx->gotswappath == 0)
1616 nd->swap_nblks = 0;
1617 #ifdef BOOTP_NFSROOT
1618 if (gctx->gotrootpath == 0)
1619 panic("bootpc: No root path offered");
1620 #endif
1621
1622 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1623 bootpc_adjust_interface(ifctx, gctx, td);
1624
1625 soclose(ifctx->so, FNONBLOCK);
1626 }
1627
1628 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1629 if (ifctx->gotrootpath != 0)
1630 break;
1631 if (ifctx == NULL) {
1632 for (ifctx = gctx->interfaces;
1633 ifctx != NULL;
1634 ifctx = ifctx->next)
1635 if (bootpc_ifctx_isresolved(ifctx) != 0)
1636 break;
1637 }
1638 if (ifctx == NULL)
1639 goto out;
1640
1641 if (gctx->gotrootpath != 0) {
1642
1643 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1644 nd->root_fh, &nd->root_fhsize,
1645 &nd->root_args, td);
1646 if (error != 0)
1647 panic("nfs_boot: mountd root, error=%d", error);
1648
1649 if (gctx->gotswappath != 0) {
1650
1651 error = md_mount(&nd->swap_saddr,
1652 nd->swap_hostnam,
1653 nd->swap_fh, &nd->swap_fhsize,
1654 &nd->swap_args, td);
1655 if (error != 0)
1656 panic("nfs_boot: mountd swap, error=%d",
1657 error);
1658
1659 error = md_lookup_swap(&nd->swap_saddr,
1660 gctx->lookup_path,
1661 nd->swap_fh, &nd->swap_fhsize,
1662 &nd->swap_args, td);
1663 if (error != 0)
1664 panic("nfs_boot: lookup swap, error=%d",
1665 error);
1666 }
1667 nfs_diskless_valid = 3;
1668 }
1669
1670 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1671 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1672 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1673 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1674 ifctx->myaddr.sin_addr.s_addr |
1675 ~ ifctx->netmask.sin_addr.s_addr;
1676 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1677
1678 out:
1679 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1680 nctx = ifctx->next;
1681 kfree(ifctx, M_TEMP);
1682 }
1683 kfree(gctx, M_TEMP);
1684 }
1685
DragonFly BSD