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HAMMER VFS: Add missing hammer_rel_volume() call in deadlock/retry case.
[dragonfly.git] / sys / vfs / nfs / bootp_subr.c
blob8e50a48dbbbe4cb3b30d6a9bee22f10cbd04b73e
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 * $DragonFly: src/sys/vfs/nfs/bootp_subr.c,v 1.26 2008/03/08 07:50:49 sephe Exp $
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>
58 #include <sys/fcntl.h>
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
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"
73 #include "nfsmountrpc.h"
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 */
90 struct 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
108 struct 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
143 struct 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
152 struct 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
215 extern struct nfsv3_diskless nfsv3_diskless;
216 static char bootp_cookie[128];
217 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
218 bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
219
220 /* mountd RPC */
221 static void print_in_addr(struct in_addr addr);
222 static void print_sin_addr(struct sockaddr_in *addr);
223 static void clear_sinaddr(struct sockaddr_in *sin);
224 static
225 struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
226 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
227 struct bootpc_globalcontext *gctx,
228 struct thread *td);
229 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
230 struct bootp_packet *bp, int len, int tag);
231 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
232 unsigned char *start, int len, int tag);
233
234 #ifdef BOOTP_DEBUG
235 void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
236 void bootpboot_p_ma(struct sockaddr *ma);
237 void bootpboot_p_rtentry(struct rtentry *rt);
238 void bootpboot_p_tree(struct radix_node *rn);
239 void bootpboot_p_rtlist(void);
240 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
241 void bootpboot_p_iflist(void);
242 #endif
243
244 static int bootpc_call(struct bootpc_globalcontext *gctx,
245 struct thread *td);
246
247 static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
248 struct bootpc_globalcontext *gctx,
249 struct thread *td);
250
251 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
252 struct bootpc_globalcontext *gctx,
253 struct thread *td);
254
255 static void bootpc_decode_reply(struct nfsv3_diskless *nd,
256 struct bootpc_ifcontext *ifctx,
257 struct bootpc_globalcontext *gctx);
258
259 static int bootpc_received(struct bootpc_globalcontext *gctx,
260 struct bootpc_ifcontext *ifctx);
261
262 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
263 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
264 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
265
266 void bootpc_init(void);
267
268 /*
269 * In order to have multiple active interfaces with address 0.0.0.0
270 * and be able to send data to a selected interface, we perform
271 * some tricks:
272 *
273 * - The 'broadcast' address is different for each interface.
274 *
275 * - We temporarily add routing pointing 255.255.255.255 to the
276 * selected interface broadcast address, thus the packet sent
277 * goes to that interface.
278 */
279
280 #ifdef BOOTP_DEBUG
281 void
282 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
283 {
284 if (sa == NULL) {
285 kprintf("(sockaddr *) <null>");
286 return;
287 }
288 switch (sa->sa_family) {
289 case AF_INET:
290 {
291 struct sockaddr_in *sin;
292
293 sin = (struct sockaddr_in *) sa;
294 kprintf("inet ");
295 print_sin_addr(sin);
296 if (ma != NULL) {
297 sin = (struct sockaddr_in *) ma;
298 kprintf(" mask ");
299 print_sin_addr(sin);
300 }
301 }
302 break;
303 case AF_LINK:
304 {
305 struct sockaddr_dl *sli;
306 int i;
307
308 sli = (struct sockaddr_dl *) sa;
309 kprintf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
310 for (i = 0; i < sli->sdl_alen; i++) {
311 if (i > 0)
312 kprintf(":");
313 kprintf("%x", ((unsigned char *) LLADDR(sli))[i]);
314 }
315 }
316 break;
317 default:
318 kprintf("af%d", sa->sa_family);
319 }
320 }
321
322
323 void
324 bootpboot_p_ma(struct sockaddr *ma)
325 {
326 if (ma == NULL) {
327 kprintf("<null>");
328 return;
329 }
330 kprintf("%x", *(int *)ma);
331 }
332
333
334 void
335 bootpboot_p_rtentry(struct rtentry *rt)
336 {
337 bootpboot_p_sa(rt_key(rt), rt_mask(rt));
338 kprintf(" ");
339 bootpboot_p_ma(rt->rt_genmask);
340 kprintf(" ");
341 bootpboot_p_sa(rt->rt_gateway, NULL);
342 kprintf(" ");
343 kprintf("flags %x", (unsigned short) rt->rt_flags);
344 kprintf(" %d", (int) rt->rt_rmx.rmx_expire);
345 kprintf(" %s\n", if_name(rt->rt_ifp));
346 }
347
348
349 void
350 bootpboot_p_tree(struct radix_node *rn)
351 {
352 while (rn != NULL) {
353 if (rn->rn_bit < 0) {
354 if ((rn->rn_flags & RNF_ROOT) != 0) {
355 } else {
356 bootpboot_p_rtentry((struct rtentry *) rn);
357 }
358 rn = rn->rn_dupedkey;
359 } else {
360 bootpboot_p_tree(rn->rn_left);
361 bootpboot_p_tree(rn->rn_right);
362 return;
363 }
364 }
365 }
366
367
368 void
369 bootpboot_p_rtlist(void)
370 {
371 kprintf("Routing table:\n");
372 bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
373 }
374
375
376 void
377 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
378 {
379 kprintf("%s flags %x, addr ",
380 if_name(ifp),
381 (unsigned short) ifp->if_flags);
382 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
383 kprintf(", broadcast ");
384 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
385 kprintf(", netmask ");
386 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
387 kprintf("\n");
388 }
389
390
391 void
392 bootpboot_p_iflist(void)
393 {
394 struct ifnet *ifp;
395 struct ifaddr_container *ifac;
396
397 kprintf("Interface list:\n");
398 TAILQ_FOREACH(ifp, &ifnet, if_link) {
399 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
400 struct ifaddr *ifa = ifac->ifa;
401
402 if (ifa->ifa_addr->sa_family == AF_INET)
403 bootpboot_p_if(ifp, ifa);
404 }
405 }
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
590 /*
591 * Create socket and set its recieve timeout.
592 */
593 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
594 if (error != 0)
595 goto out;
596
597 tv.tv_sec = 1;
598 tv.tv_usec = 0;
599 bzero(&sopt, sizeof(sopt));
600 sopt.sopt_level = SOL_SOCKET;
601 sopt.sopt_name = SO_RCVTIMEO;
602 sopt.sopt_val = &tv;
603 sopt.sopt_valsize = sizeof tv;
604
605 error = sosetopt(so, &sopt);
606 if (error != 0)
607 goto out;
608
609 /*
610 * Enable broadcast.
611 */
612 on = 1;
613 sopt.sopt_name = SO_BROADCAST;
614 sopt.sopt_val = &on;
615 sopt.sopt_valsize = sizeof on;
616
617 error = sosetopt(so, &sopt);
618 if (error != 0)
619 goto out;
620
621 /*
622 * Disable routing.
623 */
624
625 on = 1;
626 sopt.sopt_name = SO_DONTROUTE;
627 sopt.sopt_val = &on;
628 sopt.sopt_valsize = sizeof on;
629
630 error = sosetopt(so, &sopt);
631 if (error != 0)
632 goto out;
633
634 /*
635 * Bind the local endpoint to a bootp client port.
636 */
637 sin = &dst;
638 clear_sinaddr(sin);
639 sin->sin_port = htons(IPPORT_BOOTPC);
640 error = sobind(so, (struct sockaddr *)sin, td);
641 if (error != 0) {
642 kprintf("bind failed\n");
643 goto out;
644 }
645
646 /*
647 * Setup socket address for the server.
648 */
649 sin = &dst;
650 clear_sinaddr(sin);
651 sin->sin_addr.s_addr = INADDR_BROADCAST;
652 sin->sin_port = htons(IPPORT_BOOTPS);
653
654 /*
655 * Send it, repeatedly, until a reply is received,
656 * but delay each re-send by an increasing amount.
657 * If the delay hits the maximum, start complaining.
658 */
659 timo = 0;
660 rtimo = 0;
661 for (;;) {
662
663 outstanding = 0;
664 gotrootpath = 0;
665
666 for (ifctx = gctx->interfaces;
667 ifctx != NULL;
668 ifctx = ifctx->next) {
669 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
670 bootpc_tag(&gctx->tmptag, &ifctx->reply,
671 ifctx->replylen,
672 TAG_ROOT) != NULL)
673 gotrootpath = 1;
674 }
675
676 for (ifctx = gctx->interfaces;
677 ifctx != NULL;
678 ifctx = ifctx->next) {
679 ifctx->outstanding = 0;
680 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
681 gotrootpath != 0) {
682 continue;
683 }
684 if (bootpc_ifctx_isfailed(ifctx) != 0)
685 continue;
686
687 outstanding++;
688 ifctx->outstanding = 1;
689
690 /* Proceed to next step in DHCP negotiation */
691 if ((ifctx->state == IF_DHCP_OFFERED &&
692 ifctx->dhcpquerytype != DHCP_REQUEST) ||
693 (ifctx->state == IF_DHCP_UNRESOLVED &&
694 ifctx->dhcpquerytype != DHCP_DISCOVER) ||
695 (ifctx->state == IF_BOOTP_UNRESOLVED &&
696 ifctx->dhcpquerytype != DHCP_NOMSG)) {
697 ifctx->sentmsg = 0;
698 bootpc_compose_query(ifctx, gctx, td);
699 }
700
701 /* Send BOOTP request (or re-send). */
702
703 if (ifctx->sentmsg == 0) {
704 switch(ifctx->dhcpquerytype) {
705 case DHCP_DISCOVER:
706 s = "DHCP Discover";
707 break;
708 case DHCP_REQUEST:
709 s = "DHCP Request";
710 break;
711 case DHCP_NOMSG:
712 default:
713 s = "BOOTP Query";
714 break;
715 }
716 kprintf("Sending %s packet from "
717 "interface %s (%*D)\n",
718 s,
719 ifctx->ireq.ifr_name,
720 ifctx->sdl->sdl_alen,
721 (unsigned char *) LLADDR(ifctx->sdl),
722 ":");
723 ifctx->sentmsg = 1;
724 }
725
726 aio.iov_base = (caddr_t) &ifctx->call;
727 aio.iov_len = sizeof(ifctx->call);
728
729 auio.uio_iov = &aio;
730 auio.uio_iovcnt = 1;
731 auio.uio_segflg = UIO_SYSSPACE;
732 auio.uio_rw = UIO_WRITE;
733 auio.uio_offset = 0;
734 auio.uio_resid = sizeof(ifctx->call);
735 auio.uio_td = td;
736
737 /* Set netmask to 0.0.0.0 */
738
739 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
740 clear_sinaddr(sin);
741 error = ifioctl(ifctx->so, SIOCSIFNETMASK,
742 (caddr_t) &ifctx->ireq, proc0.p_ucred);
743 if (error != 0)
744 panic("bootpc_call:"
745 "set if netmask, error=%d",
746 error);
747
748 error = sosend(so, (struct sockaddr *) &dst,
749 &auio, NULL, NULL, 0, td);
750 if (error != 0) {
751 kprintf("bootpc_call: sosend: %d state %08x\n",
752 error, (int) so->so_state);
753 }
754
755 /* XXX: Is this needed ? */
756 tsleep(&error, 0, "bootpw", 10);
757
758 /* Set netmask to 255.0.0.0 */
759
760 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
761 clear_sinaddr(sin);
762 sin->sin_addr.s_addr = htonl(0xff000000u);
763 error = ifioctl(ifctx->so, SIOCSIFNETMASK,
764 (caddr_t) &ifctx->ireq, proc0.p_ucred);
765 if (error != 0)
766 panic("bootpc_call:"
767 "set if netmask, error=%d",
768 error);
769
770 }
771
772 if (outstanding == 0 &&
773 (rtimo == 0 || time_second >= rtimo)) {
774 error = 0;
775 goto gotreply;
776 }
777
778 /* Determine new timeout. */
779 if (timo < MAX_RESEND_DELAY)
780 timo++;
781 else {
782 kprintf("DHCP/BOOTP timeout for server ");
783 print_sin_addr(&dst);
784 kprintf("\n");
785 }
786
787 /*
788 * Wait for up to timo seconds for a reply.
789 * The socket receive timeout was set to 1 second.
790 */
791 atimo = timo + time_second;
792 while (time_second < atimo) {
793 aio.iov_base = (caddr_t) &gctx->reply;
794 aio.iov_len = sizeof(gctx->reply);
795
796 auio.uio_iov = &aio;
797 auio.uio_iovcnt = 1;
798 auio.uio_segflg = UIO_SYSSPACE;
799 auio.uio_rw = UIO_READ;
800 auio.uio_offset = 0;
801 auio.uio_resid = sizeof(gctx->reply);
802 auio.uio_td = td;
803
804 rcvflg = 0;
805 error = soreceive(so, NULL, &auio,
806 NULL, NULL, &rcvflg);
807 gctx->secs = time_second - gctx->starttime;
808 for (ifctx = gctx->interfaces;
809 ifctx != NULL;
810 ifctx = ifctx->next) {
811 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
812 bootpc_ifctx_isfailed(ifctx) != 0)
813 continue;
814
815 ifctx->call.secs = htons(gctx->secs);
816 }
817 if (error == EWOULDBLOCK)
818 continue;
819 if (error != 0)
820 goto out;
821 len = sizeof(gctx->reply) - auio.uio_resid;
822
823 /* Do we have the required number of bytes ? */
824 if (len < BOOTP_MIN_LEN)
825 continue;
826 gctx->replylen = len;
827
828 /* Is it a reply? */
829 if (gctx->reply.op != BOOTP_REPLY)
830 continue;
831
832 /* Is this an answer to our query */
833 for (ifctx = gctx->interfaces;
834 ifctx != NULL;
835 ifctx = ifctx->next) {
836 if (gctx->reply.xid != ifctx->call.xid)
837 continue;
838
839 /* Same HW address size ? */
840 if (gctx->reply.hlen != ifctx->call.hlen)
841 continue;
842
843 /* Correct HW address ? */
844 if (bcmp(gctx->reply.chaddr,
845 ifctx->call.chaddr,
846 ifctx->call.hlen) != 0)
847 continue;
848
849 break;
850 }
851
852 if (ifctx != NULL) {
853 s = bootpc_tag(&gctx->tmptag,
854 &gctx->reply,
855 gctx->replylen,
856 TAG_DHCP_MSGTYPE);
857 if (s != NULL) {
858 switch (*s) {
859 case DHCP_OFFER:
860 s = "DHCP Offer";
861 break;
862 case DHCP_ACK:
863 s = "DHCP Ack";
864 break;
865 default:
866 s = "DHCP (unexpected)";
867 break;
868 }
869 } else
870 s = "BOOTP Reply";
871
872 kprintf("Received %s packet"
873 " on %s from ",
874 s,
875 ifctx->ireq.ifr_name);
876 print_in_addr(gctx->reply.siaddr);
877 if (gctx->reply.giaddr.s_addr !=
878 htonl(INADDR_ANY)) {
879 kprintf(" via ");
880 print_in_addr(gctx->reply.giaddr);
881 }
882 if (bootpc_received(gctx, ifctx) != 0) {
883 kprintf(" (accepted)");
884 if (ifctx->outstanding) {
885 ifctx->outstanding = 0;
886 outstanding--;
887 }
888 /* Network settle delay */
889 if (outstanding == 0)
890 atimo = time_second +
891 BOOTP_SETTLE_DELAY;
892 } else
893 kprintf(" (ignored)");
894 if (ifctx->gotrootpath) {
895 gotrootpath = 1;
896 rtimo = time_second +
897 BOOTP_SETTLE_DELAY;
898 kprintf(" (got root path)");
899 } else
900 kprintf(" (no root path)");
901 kprintf("\n");
902 }
903 } /* while secs */
904 #ifdef BOOTP_TIMEOUT
905 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
906 break;
907 #endif
908 /* Force a retry if halfway in DHCP negotiation */
909 retry = 0;
910 for (ifctx = gctx->interfaces; ifctx != NULL;
911 ifctx = ifctx->next) {
912 if (ifctx->state == IF_DHCP_OFFERED) {
913 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
914 retry = 1;
915 else
916 ifctx->state = IF_DHCP_UNRESOLVED;
917 }
918 }
919
920 if (retry != 0)
921 continue;
922
923 if (gotrootpath != 0) {
924 gctx->gotrootpath = gotrootpath;
925 if (rtimo != 0 && time_second >= rtimo)
926 break;
927 }
928 } /* forever send/receive */
929
930 /*
931 * XXX: These are errors of varying seriousness being silently
932 * ignored
933 */
934
935 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
936 if (bootpc_ifctx_isresolved(ifctx) == 0) {
937 kprintf("%s timeout for interface %s\n",
938 ifctx->dhcpquerytype != DHCP_NOMSG ?
939 "DHCP" : "BOOTP",
940 ifctx->ireq.ifr_name);
941 }
942 }
943 if (gctx->gotrootpath != 0) {
944 #if 0
945 kprintf("Got a root path, ignoring remaining timeout\n");
946 #endif
947 error = 0;
948 goto out;
949 }
950 #ifndef BOOTP_NFSROOT
951 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
952 if (bootpc_ifctx_isresolved(ifctx) != 0) {
953 error = 0;
954 goto out;
955 }
956 }
957 #endif
958 error = ETIMEDOUT;
959 goto out;
960
961 gotreply:
962 out:
963 soclose(so, FNONBLOCK);
964 return error;
965 }
966
967
968 static int
969 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
970 struct bootpc_globalcontext *gctx,
971 struct thread *td)
972 {
973 struct ifaddr_container *ifac;
974 struct sockaddr_in *sin;
975 int error;
976
977 struct ifreq *ireq;
978 struct socket *so;
979 struct sockaddr_dl *sdl;
980
981 error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
982 if (error != 0)
983 panic("nfs_boot: socreate, error=%d", error);
984
985 ireq = &ifctx->ireq;
986 so = ifctx->so;
987
988 /*
989 * Bring up the interface.
990 *
991 * Get the old interface flags and or IFF_UP into them; if
992 * IFF_UP set blindly, interface selection can be clobbered.
993 */
994 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
995 if (error != 0)
996 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
997 ireq->ifr_flags |= IFF_UP;
998 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
999 if (error != 0)
1000 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1001
1002 /*
1003 * Do enough of ifconfig(8) so that the chosen interface
1004 * can talk to the servers. (just set the address)
1005 */
1006
1007 /* addr is 0.0.0.0 */
1008
1009 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1010 clear_sinaddr(sin);
1011 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1012 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1013 panic("bootpc_fakeup_interface: "
1014 "set if addr, error=%d", error);
1015
1016 /* netmask is 255.0.0.0 */
1017
1018 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1019 clear_sinaddr(sin);
1020 sin->sin_addr.s_addr = htonl(0xff000000u);
1021 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
1022 if (error != 0)
1023 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1024 error);
1025
1026 /* Broadcast is 255.255.255.255 */
1027
1028 sin = (struct sockaddr_in *)&ireq->ifr_addr;
1029 clear_sinaddr(sin);
1030 clear_sinaddr(&ifctx->broadcast);
1031 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1032 ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1033
1034 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
1035 if (error != 0 && error != EADDRNOTAVAIL)
1036 panic("bootpc_fakeup_interface: "
1037 "set if broadcast addr, error=%d",
1038 error);
1039 error = 0;
1040
1041 /* Get HW address */
1042
1043 sdl = NULL;
1044 TAILQ_FOREACH(ifac, &ifctx->ifp->if_addrheads[mycpuid], ifa_link) {
1045 struct ifaddr *ifa = ifac->ifa;
1046
1047 if (ifa->ifa_addr->sa_family == AF_LINK &&
1048 (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1049 sdl->sdl_type == IFT_ETHER)
1050 break;
1051 }
1052
1053 if (sdl == NULL)
1054 panic("bootpc: Unable to find HW address for %s",
1055 ifctx->ireq.ifr_name);
1056 ifctx->sdl = sdl;
1057
1058 return error;
1059 }
1060
1061
1062 static int
1063 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1064 struct bootpc_globalcontext *gctx,
1065 struct thread *td)
1066 {
1067 int error;
1068 struct sockaddr_in defdst;
1069 struct sockaddr_in defmask;
1070 struct sockaddr_in *sin;
1071
1072 struct ifreq *ireq;
1073 struct socket *so;
1074 struct sockaddr_in *myaddr;
1075 struct sockaddr_in *netmask;
1076 struct sockaddr_in *gw;
1077
1078 ireq = &ifctx->ireq;
1079 so = ifctx->so;
1080 myaddr = &ifctx->myaddr;
1081 netmask = &ifctx->netmask;
1082 gw = &ifctx->gw;
1083
1084 if (bootpc_ifctx_isresolved(ifctx) == 0) {
1085
1086 /* Shutdown interfaces where BOOTP failed */
1087
1088 kprintf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1089 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1090 if (error != 0)
1091 panic("bootpc_adjust_interface: "
1092 "SIOCGIFFLAGS, error=%d", error);
1093 ireq->ifr_flags &= ~IFF_UP;
1094 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1095 if (error != 0)
1096 panic("bootpc_adjust_interface: "
1097 "SIOCSIFFLAGS, error=%d", error);
1098
1099 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1100 clear_sinaddr(sin);
1101 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
1102 if (error != 0 && (error != EADDRNOTAVAIL ||
1103 ifctx == gctx->interfaces))
1104 panic("bootpc_adjust_interface: "
1105 "SIOCDIFADDR, error=%d", error);
1106
1107 return 0;
1108 }
1109
1110 kprintf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1111 /*
1112 * Do enough of ifconfig(8) so that the chosen interface
1113 * can talk to the servers. (just set the address)
1114 */
1115 bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1116 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
1117 if (error != 0)
1118 panic("bootpc_adjust_interface: "
1119 "set if netmask, error=%d", error);
1120
1121 /* Broadcast is with host part of IP address all 1's */
1122
1123 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1124 clear_sinaddr(sin);
1125 sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1126 ~ netmask->sin_addr.s_addr;
1127 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
1128 if (error != 0)
1129 panic("bootpc_adjust_interface: "
1130 "set if broadcast addr, error=%d", error);
1131
1132 bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1133 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1134 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1135 panic("bootpc_adjust_interface: "
1136 "set if addr, error=%d", error);
1137
1138 /* Add new default route */
1139
1140 if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1141 clear_sinaddr(&defdst);
1142 clear_sinaddr(&defmask);
1143 error = rtrequest_global(RTM_ADD, (struct sockaddr *) &defdst,
1144 (struct sockaddr *) gw,
1145 (struct sockaddr *) &defmask,
1146 (RTF_UP | RTF_GATEWAY | RTF_STATIC));
1147 if (error != 0) {
1148 kprintf("bootpc_adjust_interface: "
1149 "add net route, error=%d\n", error);
1150 return error;
1151 }
1152 }
1153
1154 return 0;
1155 }
1156
1157 static void
1158 print_sin_addr(struct sockaddr_in *sin)
1159 {
1160 print_in_addr(sin->sin_addr);
1161 }
1162
1163
1164 static void
1165 print_in_addr(struct in_addr addr)
1166 {
1167 unsigned int ip;
1168
1169 ip = ntohl(addr.s_addr);
1170 kprintf("%d.%d.%d.%d",
1171 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1172 }
1173
1174 static void
1175 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1176 struct bootpc_globalcontext *gctx, struct thread *td)
1177 {
1178 unsigned char *vendp;
1179 unsigned char vendor_client[64];
1180 uint32_t leasetime;
1181 uint8_t vendor_client_len;
1182
1183 ifctx->gotrootpath = 0;
1184
1185 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1186
1187 /* bootpc part */
1188 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */
1189 ifctx->call.htype = 1; /* 10mb ethernet */
1190 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1191 ifctx->call.hops = 0;
1192 if (bootpc_ifctx_isunresolved(ifctx) != 0)
1193 ifctx->xid++;
1194 ifctx->call.xid = txdr_unsigned(ifctx->xid);
1195 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1196
1197 vendp = ifctx->call.vend;
1198 *vendp++ = 99; /* RFC1048 cookie */
1199 *vendp++ = 130;
1200 *vendp++ = 83;
1201 *vendp++ = 99;
1202 *vendp++ = TAG_MAXMSGSIZE;
1203 *vendp++ = 2;
1204 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1205 *vendp++ = sizeof(struct bootp_packet) & 255;
1206
1207 ksnprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1208 ostype, MACHINE, osrelease);
1209 vendor_client_len = strlen(vendor_client);
1210 *vendp++ = TAG_VENDOR_INDENTIFIER;
1211 *vendp++ = vendor_client_len;
1212 memcpy(vendp, vendor_client, vendor_client_len);
1213 vendp += vendor_client_len;
1214 ifctx->dhcpquerytype = DHCP_NOMSG;
1215 switch (ifctx->state) {
1216 case IF_DHCP_UNRESOLVED:
1217 *vendp++ = TAG_DHCP_MSGTYPE;
1218 *vendp++ = 1;
1219 *vendp++ = DHCP_DISCOVER;
1220 ifctx->dhcpquerytype = DHCP_DISCOVER;
1221 ifctx->gotdhcpserver = 0;
1222 break;
1223 case IF_DHCP_OFFERED:
1224 *vendp++ = TAG_DHCP_MSGTYPE;
1225 *vendp++ = 1;
1226 *vendp++ = DHCP_REQUEST;
1227 ifctx->dhcpquerytype = DHCP_REQUEST;
1228 *vendp++ = TAG_DHCP_REQ_ADDR;
1229 *vendp++ = 4;
1230 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1231 vendp += 4;
1232 if (ifctx->gotdhcpserver != 0) {
1233 *vendp++ = TAG_DHCP_SERVERID;
1234 *vendp++ = 4;
1235 memcpy(vendp, &ifctx->dhcpserver, 4);
1236 vendp += 4;
1237 }
1238 *vendp++ = TAG_DHCP_LEASETIME;
1239 *vendp++ = 4;
1240 leasetime = htonl(300);
1241 memcpy(vendp, &leasetime, 4);
1242 vendp += 4;
1243 default:
1244 ;
1245 }
1246 *vendp = TAG_END;
1247
1248 ifctx->call.secs = 0;
1249 ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1250 }
1251
1252
1253 static int
1254 bootpc_hascookie(struct bootp_packet *bp)
1255 {
1256 return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1257 bp->vend[2] == 83 && bp->vend[3] == 99);
1258 }
1259
1260
1261 static void
1262 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1263 unsigned char *start, int len, int tag)
1264 {
1265 unsigned char *j;
1266 unsigned char *ej;
1267 unsigned char code;
1268
1269 if (tctx->badtag != 0 || tctx->badopt != 0)
1270 return;
1271
1272 j = start;
1273 ej = j + len;
1274
1275 while (j < ej) {
1276 code = *j++;
1277 if (code == TAG_PAD)
1278 continue;
1279 if (code == TAG_END)
1280 return;
1281 if (j >= ej || j + *j + 1 > ej) {
1282 tctx->badopt = 1;
1283 return;
1284 }
1285 len = *j++;
1286 if (code == tag) {
1287 if (tctx->taglen + len > TAG_MAXLEN) {
1288 tctx->badtag = 1;
1289 return;
1290 }
1291 tctx->foundopt = 1;
1292 if (len > 0)
1293 memcpy(tctx->buf + tctx->taglen,
1294 j, len);
1295 tctx->taglen += len;
1296 }
1297 if (code == TAG_OVERLOAD)
1298 tctx->overload = *j;
1299
1300 j += len;
1301 }
1302 }
1303
1304
1305 static unsigned char *
1306 bootpc_tag(struct bootpc_tagcontext *tctx, struct bootp_packet *bp,
1307 int len, int tag)
1308 {
1309 unsigned char *j;
1310 unsigned char *ej;
1311
1312 tctx->overload = 0;
1313 tctx->badopt = 0;
1314 tctx->badtag = 0;
1315 tctx->foundopt = 0;
1316 tctx->taglen = 0;
1317
1318 if (bootpc_hascookie(bp) == 0)
1319 return NULL;
1320
1321 j = &bp->vend[4];
1322 ej = (unsigned char *) bp + len;
1323
1324 bootpc_tag_helper(tctx, &bp->vend[4],
1325 (unsigned char *) bp + len - &bp->vend[4], tag);
1326
1327 if ((tctx->overload & OVERLOAD_FILE) != 0)
1328 bootpc_tag_helper(tctx,
1329 (unsigned char *) bp->file,
1330 sizeof(bp->file),
1331 tag);
1332 if ((tctx->overload & OVERLOAD_SNAME) != 0)
1333 bootpc_tag_helper(tctx,
1334 (unsigned char *) bp->sname,
1335 sizeof(bp->sname),
1336 tag);
1337
1338 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1339 return NULL;
1340 tctx->buf[tctx->taglen] = '\0';
1341 return tctx->buf;
1342 }
1343
1344
1345 static void
1346 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1347 struct bootpc_globalcontext *gctx)
1348 {
1349 char *p;
1350 unsigned int ip;
1351
1352 ifctx->gotgw = 0;
1353 ifctx->gotnetmask = 0;
1354
1355 clear_sinaddr(&ifctx->myaddr);
1356 clear_sinaddr(&ifctx->netmask);
1357 clear_sinaddr(&ifctx->gw);
1358
1359 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1360
1361 ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1362 ksnprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1363 "swap.%d.%d.%d.%d",
1364 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1365
1366 kprintf("%s at ", ifctx->ireq.ifr_name);
1367 print_sin_addr(&ifctx->myaddr);
1368 kprintf(" server ");
1369 print_in_addr(ifctx->reply.siaddr);
1370
1371 ifctx->gw.sin_addr = ifctx->reply.giaddr;
1372 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1373 kprintf(" via gateway ");
1374 print_in_addr(ifctx->reply.giaddr);
1375 }
1376
1377 /* This call used for the side effect (overload flag) */
1378 (void) bootpc_tag(&gctx->tmptag,
1379 &ifctx->reply, ifctx->replylen, TAG_END);
1380
1381 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1382 if (ifctx->reply.sname[0] != '\0')
1383 kprintf(" server name %s", ifctx->reply.sname);
1384 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1385 if (ifctx->reply.file[0] != '\0')
1386 kprintf(" boot file %s", ifctx->reply.file);
1387
1388 kprintf("\n");
1389
1390 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1391 TAG_SUBNETMASK);
1392 if (p != NULL) {
1393 if (gctx->tag.taglen != 4)
1394 panic("bootpc: subnet mask len is %d",
1395 gctx->tag.taglen);
1396 bcopy(p, &ifctx->netmask.sin_addr, 4);
1397 ifctx->gotnetmask = 1;
1398 kprintf("subnet mask ");
1399 print_sin_addr(&ifctx->netmask);
1400 kprintf(" ");
1401 }
1402
1403 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1404 TAG_ROUTERS);
1405 if (p != NULL) {
1406 /* Routers */
1407 if (gctx->tag.taglen % 4)
1408 panic("bootpc: Router Len is %d", gctx->tag.taglen);
1409 if (gctx->tag.taglen > 0) {
1410 bcopy(p, &ifctx->gw.sin_addr, 4);
1411 kprintf("router ");
1412 print_sin_addr(&ifctx->gw);
1413 kprintf(" ");
1414 ifctx->gotgw = 1;
1415 gctx->gotgw = 1;
1416 }
1417 }
1418
1419 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1420 TAG_ROOT);
1421 if (p != NULL) {
1422 if (gctx->setrootfs != NULL) {
1423 kprintf("rootfs %s (ignored) ", p);
1424 } else if (setfs(&nd->root_saddr,
1425 nd->root_hostnam, p)) {
1426 kprintf("rootfs %s ",p);
1427 gctx->gotrootpath = 1;
1428 ifctx->gotrootpath = 1;
1429 gctx->setrootfs = ifctx;
1430
1431 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1432 ifctx->replylen,
1433 TAG_ROOTOPTS);
1434 if (p != NULL) {
1435 mountopts(&nd->root_args, p);
1436 kprintf("rootopts %s ", p);
1437 }
1438 } else
1439 panic("Failed to set rootfs to %s",p);
1440 }
1441
1442 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1443 TAG_SWAP);
1444 if (p != NULL) {
1445 if (gctx->setswapfs != NULL) {
1446 kprintf("swapfs %s (ignored) ", p);
1447 } else if (setfs(&nd->swap_saddr,
1448 nd->swap_hostnam, p)) {
1449 gctx->gotswappath = 1;
1450 gctx->setswapfs = ifctx;
1451 kprintf("swapfs %s ", p);
1452
1453 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1454 ifctx->replylen,
1455 TAG_SWAPOPTS);
1456 if (p != NULL) {
1457 /* swap mount options */
1458 mountopts(&nd->swap_args, p);
1459 kprintf("swapopts %s ", p);
1460 }
1461
1462 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1463 ifctx->replylen,
1464 TAG_SWAPSIZE);
1465 if (p != NULL) {
1466 int swaplen;
1467 if (gctx->tag.taglen != 4)
1468 panic("bootpc: "
1469 "Expected 4 bytes for swaplen, "
1470 "not %d bytes",
1471 gctx->tag.taglen);
1472 bcopy(p, &swaplen, 4);
1473 nd->swap_nblks = ntohl(swaplen);
1474 kprintf("swapsize %d KB ",
1475 nd->swap_nblks);
1476 }
1477 } else
1478 panic("Failed to set swapfs to %s", p);
1479 }
1480
1481 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1482 TAG_HOSTNAME);
1483 if (p != NULL) {
1484 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1485 panic("bootpc: hostname >= %d bytes",
1486 MAXHOSTNAMELEN);
1487 if (gctx->sethostname != NULL) {
1488 kprintf("hostname %s (ignored) ", p);
1489 } else {
1490 strcpy(nd->my_hostnam, p);
1491 strcpy(hostname, p);
1492 kprintf("hostname %s ",hostname);
1493 gctx->sethostname = ifctx;
1494 }
1495 }
1496 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1497 TAG_COOKIE);
1498 if (p != NULL) { /* store in a sysctl variable */
1499 int i, l = sizeof(bootp_cookie) - 1;
1500 for (i = 0; i < l && p[i] != '\0'; i++)
1501 bootp_cookie[i] = p[i];
1502 p[i] = '\0';
1503 }
1504
1505 kprintf("\n");
1506
1507 if (ifctx->gotnetmask == 0) {
1508 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1509 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1510 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1511 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1512 else
1513 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1514 }
1515 if (ifctx->gotgw == 0) {
1516 /* Use proxyarp */
1517 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1518 }
1519 }
1520
1521 void
1522 bootpc_init(void)
1523 {
1524 struct bootpc_ifcontext *ifctx, *nctx; /* Interface BOOTP contexts */
1525 struct bootpc_globalcontext *gctx; /* Global BOOTP context */
1526 struct ifnet *ifp;
1527 int error;
1528 struct nfsv3_diskless *nd;
1529 struct thread *td;
1530
1531 nd = &nfsv3_diskless;
1532 td = curthread;
1533
1534 /*
1535 * If already filled in, don't touch it here
1536 */
1537 if (nfs_diskless_valid != 0)
1538 return;
1539
1540 /*
1541 * Wait until arp entries can be handled.
1542 */
1543 while (time_second == 0)
1544 tsleep(&time_second, 0, "arpkludge", 10);
1545
1546 gctx = kmalloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1547
1548 gctx->xid = ~0xFFFF;
1549 gctx->starttime = time_second;
1550
1551 ifctx = allocifctx(gctx);
1552
1553 /*
1554 * Find a network interface.
1555 */
1556 #ifdef BOOTP_WIRED_TO
1557 kprintf("bootpc_init: wired to interface '%s'\n",
1558 __XSTRING(BOOTP_WIRED_TO));
1559 #endif
1560 bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1561 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1562 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1563 sizeof(ifctx->ireq.ifr_name));
1564 #ifdef BOOTP_WIRED_TO
1565 if (strcmp(ifctx->ireq.ifr_name,
1566 __XSTRING(BOOTP_WIRED_TO)) != 0)
1567 continue;
1568 #else
1569 if ((ifp->if_flags &
1570 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1571 IFF_BROADCAST)
1572 continue;
1573 #endif
1574 if (gctx->interfaces != NULL)
1575 gctx->lastinterface->next = ifctx;
1576 else
1577 gctx->interfaces = ifctx;
1578 ifctx->ifp = ifp;
1579 gctx->lastinterface = ifctx;
1580 ifctx = allocifctx(gctx);
1581 }
1582 kfree(ifctx, M_TEMP);
1583
1584 if (gctx->interfaces == NULL) {
1585 #ifdef BOOTP_WIRED_TO
1586 panic("bootpc_init: Could not find interface specified "
1587 "by BOOTP_WIRED_TO: "
1588 __XSTRING(BOOTP_WIRED_TO));
1589 #else
1590 panic("bootpc_init: no suitable interface");
1591 #endif
1592 }
1593
1594 gctx->gotrootpath = 0;
1595 gctx->gotswappath = 0;
1596 gctx->gotgw = 0;
1597
1598 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1599 bootpc_fakeup_interface(ifctx, gctx, td);
1600
1601 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1602 bootpc_compose_query(ifctx, gctx, td);
1603
1604 ifctx = gctx->interfaces;
1605 error = bootpc_call(gctx, td);
1606
1607 if (error != 0) {
1608 #ifdef BOOTP_NFSROOT
1609 panic("BOOTP call failed");
1610 #else
1611 kprintf("BOOTP call failed\n");
1612 #endif
1613 }
1614
1615 mountopts(&nd->root_args, NULL);
1616
1617 mountopts(&nd->swap_args, NULL);
1618
1619 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1620 if (bootpc_ifctx_isresolved(ifctx) != 0)
1621 bootpc_decode_reply(nd, ifctx, gctx);
1622
1623 if (gctx->gotswappath == 0)
1624 nd->swap_nblks = 0;
1625 #ifdef BOOTP_NFSROOT
1626 if (gctx->gotrootpath == 0)
1627 panic("bootpc: No root path offered");
1628 #endif
1629
1630 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1631 bootpc_adjust_interface(ifctx, gctx, td);
1632
1633 soclose(ifctx->so, FNONBLOCK);
1634 }
1635
1636 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1637 if (ifctx->gotrootpath != 0)
1638 break;
1639 if (ifctx == NULL) {
1640 for (ifctx = gctx->interfaces;
1641 ifctx != NULL;
1642 ifctx = ifctx->next)
1643 if (bootpc_ifctx_isresolved(ifctx) != 0)
1644 break;
1645 }
1646 if (ifctx == NULL)
1647 goto out;
1648
1649 if (gctx->gotrootpath != 0) {
1650
1651 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1652 nd->root_fh, &nd->root_fhsize,
1653 &nd->root_args, td);
1654 if (error != 0)
1655 panic("nfs_boot: mountd root, error=%d", error);
1656
1657 if (gctx->gotswappath != 0) {
1658
1659 error = md_mount(&nd->swap_saddr,
1660 nd->swap_hostnam,
1661 nd->swap_fh, &nd->swap_fhsize,
1662 &nd->swap_args, td);
1663 if (error != 0)
1664 panic("nfs_boot: mountd swap, error=%d",
1665 error);
1666
1667 error = md_lookup_swap(&nd->swap_saddr,
1668 gctx->lookup_path,
1669 nd->swap_fh, &nd->swap_fhsize,
1670 &nd->swap_args, td);
1671 if (error != 0)
1672 panic("nfs_boot: lookup swap, error=%d",
1673 error);
1674 }
1675 nfs_diskless_valid = 3;
1676 }
1677
1678 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1679 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1680 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1681 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1682 ifctx->myaddr.sin_addr.s_addr |
1683 ~ ifctx->netmask.sin_addr.s_addr;
1684 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1685
1686 out:
1687 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1688 nctx = ifctx->next;
1689 kfree(ifctx, M_TEMP);
1690 }
1691 kfree(gctx, M_TEMP);
1692 }
1693
DragonFly BSD