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Parallelize ifnet.if_addrhead accessing by duplicating the list itself
[dragonfly.git] / sys / vfs / nfs / bootp_subr.c
blob3e43c69a563f80c4f726dfb4e8eff1a24614f410
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 1.25 2008/03/07 11:34:21 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 *ifa;
396
397 kprintf("Interface list:\n");
398 TAILQ_FOREACH(ifp, &ifnet, if_link) {
399 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
400 if (ifa->ifa_addr->sa_family == AF_INET)
401 bootpboot_p_if(ifp, ifa);
402 }
403 }
404 #endif /* defined(BOOTP_DEBUG) */
405
406
407 static void
408 clear_sinaddr(struct sockaddr_in *sin)
409 {
410 bzero(sin, sizeof(*sin));
411 sin->sin_len = sizeof(*sin);
412 sin->sin_family = AF_INET;
413 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
414 sin->sin_port = 0;
415 }
416
417
418 static struct bootpc_ifcontext *
419 allocifctx(struct bootpc_globalcontext *gctx)
420 {
421 struct bootpc_ifcontext *ifctx;
422 ifctx = (struct bootpc_ifcontext *) kmalloc(sizeof(*ifctx),
423 M_TEMP, M_WAITOK);
424 bzero(ifctx, sizeof(*ifctx));
425 ifctx->xid = gctx->xid;
426 #ifdef BOOTP_NO_DHCP
427 ifctx->state = IF_BOOTP_UNRESOLVED;
428 #else
429 ifctx->state = IF_DHCP_UNRESOLVED;
430 #endif
431 gctx->xid += 0x100;
432 return ifctx;
433 }
434
435
436 static __inline int
437 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
438 {
439 if (ifctx->state == IF_BOOTP_RESOLVED ||
440 ifctx->state == IF_DHCP_RESOLVED)
441 return 1;
442 return 0;
443 }
444
445
446 static __inline int
447 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
448 {
449 if (ifctx->state == IF_BOOTP_UNRESOLVED ||
450 ifctx->state == IF_DHCP_UNRESOLVED)
451 return 1;
452 return 0;
453 }
454
455
456 static __inline int
457 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
458 {
459 if (ifctx->state == IF_BOOTP_FAILED ||
460 ifctx->state == IF_DHCP_FAILED)
461 return 1;
462 return 0;
463 }
464
465
466 static int
467 bootpc_received(struct bootpc_globalcontext *gctx,
468 struct bootpc_ifcontext *ifctx)
469 {
470 unsigned char dhcpreplytype;
471 char *p;
472 /*
473 * Need timeout for fallback to less
474 * desirable alternative.
475 */
476
477
478 /* This call used for the side effect (badopt flag) */
479 (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
480 gctx->replylen,
481 TAG_END);
482
483 /* If packet is invalid, ignore it */
484 if (gctx->tmptag.badopt != 0)
485 return 0;
486
487 p = bootpc_tag(&gctx->tmptag, &gctx->reply,
488 gctx->replylen, TAG_DHCP_MSGTYPE);
489 if (p != NULL)
490 dhcpreplytype = *p;
491 else
492 dhcpreplytype = DHCP_NOMSG;
493
494 switch (ifctx->dhcpquerytype) {
495 case DHCP_DISCOVER:
496 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */
497 #ifndef BOOTP_FORCE_DHCP
498 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */
499 #endif
500 )
501 return 0;
502 break;
503 case DHCP_REQUEST:
504 if (dhcpreplytype != DHCP_ACK)
505 return 0;
506 /* fall through */
507 case DHCP_NOMSG:
508 break;
509 }
510
511
512 /* Ignore packet unless it gives us a root tag we didn't have */
513
514 if ((ifctx->state == IF_BOOTP_RESOLVED ||
515 (ifctx->dhcpquerytype == DHCP_DISCOVER &&
516 (ifctx->state == IF_DHCP_OFFERED ||
517 ifctx->state == IF_DHCP_RESOLVED))) &&
518 (bootpc_tag(&gctx->tmptag, &ifctx->reply,
519 ifctx->replylen,
520 TAG_ROOT) != NULL ||
521 bootpc_tag(&gctx->tmptag, &gctx->reply,
522 gctx->replylen,
523 TAG_ROOT) == NULL))
524 return 0;
525
526 bcopy(&gctx->reply,
527 &ifctx->reply,
528 gctx->replylen);
529 ifctx->replylen = gctx->replylen;
530
531 /* XXX: Only reset if 'perfect' response */
532 if (ifctx->state == IF_BOOTP_UNRESOLVED)
533 ifctx->state = IF_BOOTP_RESOLVED;
534 else if (ifctx->state == IF_DHCP_UNRESOLVED &&
535 ifctx->dhcpquerytype == DHCP_DISCOVER) {
536 if (dhcpreplytype == DHCP_OFFER)
537 ifctx->state = IF_DHCP_OFFERED;
538 else
539 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */
540 } else if (ifctx->state == IF_DHCP_OFFERED &&
541 ifctx->dhcpquerytype == DHCP_REQUEST)
542 ifctx->state = IF_DHCP_RESOLVED;
543
544
545 if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
546 ifctx->state != IF_BOOTP_RESOLVED) {
547 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
548 ifctx->replylen, TAG_DHCP_SERVERID);
549 if (p != NULL && gctx->tmptag.taglen == 4) {
550 memcpy(&ifctx->dhcpserver, p, 4);
551 ifctx->gotdhcpserver = 1;
552 } else
553 ifctx->gotdhcpserver = 0;
554 return 1;
555 }
556
557 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
558 ifctx->replylen,
559 TAG_ROOT) != NULL);
560 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
561 ifctx->replylen,
562 TAG_ROUTERS) != NULL);
563 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
564 ifctx->replylen,
565 TAG_SUBNETMASK) != NULL);
566 return 1;
567 }
568
569 static int
570 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
571 {
572 struct socket *so;
573 struct sockaddr_in *sin, dst;
574 struct uio auio;
575 struct sockopt sopt;
576 struct iovec aio;
577 int error, on, rcvflg, timo, len;
578 time_t atimo;
579 time_t rtimo;
580 struct timeval tv;
581 struct bootpc_ifcontext *ifctx;
582 int outstanding;
583 int gotrootpath;
584 int retry;
585 const char *s;
586
587 /*
588 * Create socket and set its recieve timeout.
589 */
590 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
591 if (error != 0)
592 goto out;
593
594 tv.tv_sec = 1;
595 tv.tv_usec = 0;
596 bzero(&sopt, sizeof(sopt));
597 sopt.sopt_level = SOL_SOCKET;
598 sopt.sopt_name = SO_RCVTIMEO;
599 sopt.sopt_val = &tv;
600 sopt.sopt_valsize = sizeof tv;
601
602 error = sosetopt(so, &sopt);
603 if (error != 0)
604 goto out;
605
606 /*
607 * Enable broadcast.
608 */
609 on = 1;
610 sopt.sopt_name = SO_BROADCAST;
611 sopt.sopt_val = &on;
612 sopt.sopt_valsize = sizeof on;
613
614 error = sosetopt(so, &sopt);
615 if (error != 0)
616 goto out;
617
618 /*
619 * Disable routing.
620 */
621
622 on = 1;
623 sopt.sopt_name = SO_DONTROUTE;
624 sopt.sopt_val = &on;
625 sopt.sopt_valsize = sizeof on;
626
627 error = sosetopt(so, &sopt);
628 if (error != 0)
629 goto out;
630
631 /*
632 * Bind the local endpoint to a bootp client port.
633 */
634 sin = &dst;
635 clear_sinaddr(sin);
636 sin->sin_port = htons(IPPORT_BOOTPC);
637 error = sobind(so, (struct sockaddr *)sin, td);
638 if (error != 0) {
639 kprintf("bind failed\n");
640 goto out;
641 }
642
643 /*
644 * Setup socket address for the server.
645 */
646 sin = &dst;
647 clear_sinaddr(sin);
648 sin->sin_addr.s_addr = INADDR_BROADCAST;
649 sin->sin_port = htons(IPPORT_BOOTPS);
650
651 /*
652 * Send it, repeatedly, until a reply is received,
653 * but delay each re-send by an increasing amount.
654 * If the delay hits the maximum, start complaining.
655 */
656 timo = 0;
657 rtimo = 0;
658 for (;;) {
659
660 outstanding = 0;
661 gotrootpath = 0;
662
663 for (ifctx = gctx->interfaces;
664 ifctx != NULL;
665 ifctx = ifctx->next) {
666 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
667 bootpc_tag(&gctx->tmptag, &ifctx->reply,
668 ifctx->replylen,
669 TAG_ROOT) != NULL)
670 gotrootpath = 1;
671 }
672
673 for (ifctx = gctx->interfaces;
674 ifctx != NULL;
675 ifctx = ifctx->next) {
676 ifctx->outstanding = 0;
677 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
678 gotrootpath != 0) {
679 continue;
680 }
681 if (bootpc_ifctx_isfailed(ifctx) != 0)
682 continue;
683
684 outstanding++;
685 ifctx->outstanding = 1;
686
687 /* Proceed to next step in DHCP negotiation */
688 if ((ifctx->state == IF_DHCP_OFFERED &&
689 ifctx->dhcpquerytype != DHCP_REQUEST) ||
690 (ifctx->state == IF_DHCP_UNRESOLVED &&
691 ifctx->dhcpquerytype != DHCP_DISCOVER) ||
692 (ifctx->state == IF_BOOTP_UNRESOLVED &&
693 ifctx->dhcpquerytype != DHCP_NOMSG)) {
694 ifctx->sentmsg = 0;
695 bootpc_compose_query(ifctx, gctx, td);
696 }
697
698 /* Send BOOTP request (or re-send). */
699
700 if (ifctx->sentmsg == 0) {
701 switch(ifctx->dhcpquerytype) {
702 case DHCP_DISCOVER:
703 s = "DHCP Discover";
704 break;
705 case DHCP_REQUEST:
706 s = "DHCP Request";
707 break;
708 case DHCP_NOMSG:
709 default:
710 s = "BOOTP Query";
711 break;
712 }
713 kprintf("Sending %s packet from "
714 "interface %s (%*D)\n",
715 s,
716 ifctx->ireq.ifr_name,
717 ifctx->sdl->sdl_alen,
718 (unsigned char *) LLADDR(ifctx->sdl),
719 ":");
720 ifctx->sentmsg = 1;
721 }
722
723 aio.iov_base = (caddr_t) &ifctx->call;
724 aio.iov_len = sizeof(ifctx->call);
725
726 auio.uio_iov = &aio;
727 auio.uio_iovcnt = 1;
728 auio.uio_segflg = UIO_SYSSPACE;
729 auio.uio_rw = UIO_WRITE;
730 auio.uio_offset = 0;
731 auio.uio_resid = sizeof(ifctx->call);
732 auio.uio_td = td;
733
734 /* Set netmask to 0.0.0.0 */
735
736 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
737 clear_sinaddr(sin);
738 error = ifioctl(ifctx->so, SIOCSIFNETMASK,
739 (caddr_t) &ifctx->ireq, proc0.p_ucred);
740 if (error != 0)
741 panic("bootpc_call:"
742 "set if netmask, error=%d",
743 error);
744
745 error = sosend(so, (struct sockaddr *) &dst,
746 &auio, NULL, NULL, 0, td);
747 if (error != 0) {
748 kprintf("bootpc_call: sosend: %d state %08x\n",
749 error, (int) so->so_state);
750 }
751
752 /* XXX: Is this needed ? */
753 tsleep(&error, 0, "bootpw", 10);
754
755 /* Set netmask to 255.0.0.0 */
756
757 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
758 clear_sinaddr(sin);
759 sin->sin_addr.s_addr = htonl(0xff000000u);
760 error = ifioctl(ifctx->so, SIOCSIFNETMASK,
761 (caddr_t) &ifctx->ireq, proc0.p_ucred);
762 if (error != 0)
763 panic("bootpc_call:"
764 "set if netmask, error=%d",
765 error);
766
767 }
768
769 if (outstanding == 0 &&
770 (rtimo == 0 || time_second >= rtimo)) {
771 error = 0;
772 goto gotreply;
773 }
774
775 /* Determine new timeout. */
776 if (timo < MAX_RESEND_DELAY)
777 timo++;
778 else {
779 kprintf("DHCP/BOOTP timeout for server ");
780 print_sin_addr(&dst);
781 kprintf("\n");
782 }
783
784 /*
785 * Wait for up to timo seconds for a reply.
786 * The socket receive timeout was set to 1 second.
787 */
788 atimo = timo + time_second;
789 while (time_second < atimo) {
790 aio.iov_base = (caddr_t) &gctx->reply;
791 aio.iov_len = sizeof(gctx->reply);
792
793 auio.uio_iov = &aio;
794 auio.uio_iovcnt = 1;
795 auio.uio_segflg = UIO_SYSSPACE;
796 auio.uio_rw = UIO_READ;
797 auio.uio_offset = 0;
798 auio.uio_resid = sizeof(gctx->reply);
799 auio.uio_td = td;
800
801 rcvflg = 0;
802 error = soreceive(so, NULL, &auio,
803 NULL, NULL, &rcvflg);
804 gctx->secs = time_second - gctx->starttime;
805 for (ifctx = gctx->interfaces;
806 ifctx != NULL;
807 ifctx = ifctx->next) {
808 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
809 bootpc_ifctx_isfailed(ifctx) != 0)
810 continue;
811
812 ifctx->call.secs = htons(gctx->secs);
813 }
814 if (error == EWOULDBLOCK)
815 continue;
816 if (error != 0)
817 goto out;
818 len = sizeof(gctx->reply) - auio.uio_resid;
819
820 /* Do we have the required number of bytes ? */
821 if (len < BOOTP_MIN_LEN)
822 continue;
823 gctx->replylen = len;
824
825 /* Is it a reply? */
826 if (gctx->reply.op != BOOTP_REPLY)
827 continue;
828
829 /* Is this an answer to our query */
830 for (ifctx = gctx->interfaces;
831 ifctx != NULL;
832 ifctx = ifctx->next) {
833 if (gctx->reply.xid != ifctx->call.xid)
834 continue;
835
836 /* Same HW address size ? */
837 if (gctx->reply.hlen != ifctx->call.hlen)
838 continue;
839
840 /* Correct HW address ? */
841 if (bcmp(gctx->reply.chaddr,
842 ifctx->call.chaddr,
843 ifctx->call.hlen) != 0)
844 continue;
845
846 break;
847 }
848
849 if (ifctx != NULL) {
850 s = bootpc_tag(&gctx->tmptag,
851 &gctx->reply,
852 gctx->replylen,
853 TAG_DHCP_MSGTYPE);
854 if (s != NULL) {
855 switch (*s) {
856 case DHCP_OFFER:
857 s = "DHCP Offer";
858 break;
859 case DHCP_ACK:
860 s = "DHCP Ack";
861 break;
862 default:
863 s = "DHCP (unexpected)";
864 break;
865 }
866 } else
867 s = "BOOTP Reply";
868
869 kprintf("Received %s packet"
870 " on %s from ",
871 s,
872 ifctx->ireq.ifr_name);
873 print_in_addr(gctx->reply.siaddr);
874 if (gctx->reply.giaddr.s_addr !=
875 htonl(INADDR_ANY)) {
876 kprintf(" via ");
877 print_in_addr(gctx->reply.giaddr);
878 }
879 if (bootpc_received(gctx, ifctx) != 0) {
880 kprintf(" (accepted)");
881 if (ifctx->outstanding) {
882 ifctx->outstanding = 0;
883 outstanding--;
884 }
885 /* Network settle delay */
886 if (outstanding == 0)
887 atimo = time_second +
888 BOOTP_SETTLE_DELAY;
889 } else
890 kprintf(" (ignored)");
891 if (ifctx->gotrootpath) {
892 gotrootpath = 1;
893 rtimo = time_second +
894 BOOTP_SETTLE_DELAY;
895 kprintf(" (got root path)");
896 } else
897 kprintf(" (no root path)");
898 kprintf("\n");
899 }
900 } /* while secs */
901 #ifdef BOOTP_TIMEOUT
902 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
903 break;
904 #endif
905 /* Force a retry if halfway in DHCP negotiation */
906 retry = 0;
907 for (ifctx = gctx->interfaces; ifctx != NULL;
908 ifctx = ifctx->next) {
909 if (ifctx->state == IF_DHCP_OFFERED) {
910 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
911 retry = 1;
912 else
913 ifctx->state = IF_DHCP_UNRESOLVED;
914 }
915 }
916
917 if (retry != 0)
918 continue;
919
920 if (gotrootpath != 0) {
921 gctx->gotrootpath = gotrootpath;
922 if (rtimo != 0 && time_second >= rtimo)
923 break;
924 }
925 } /* forever send/receive */
926
927 /*
928 * XXX: These are errors of varying seriousness being silently
929 * ignored
930 */
931
932 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
933 if (bootpc_ifctx_isresolved(ifctx) == 0) {
934 kprintf("%s timeout for interface %s\n",
935 ifctx->dhcpquerytype != DHCP_NOMSG ?
936 "DHCP" : "BOOTP",
937 ifctx->ireq.ifr_name);
938 }
939 }
940 if (gctx->gotrootpath != 0) {
941 #if 0
942 kprintf("Got a root path, ignoring remaining timeout\n");
943 #endif
944 error = 0;
945 goto out;
946 }
947 #ifndef BOOTP_NFSROOT
948 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
949 if (bootpc_ifctx_isresolved(ifctx) != 0) {
950 error = 0;
951 goto out;
952 }
953 }
954 #endif
955 error = ETIMEDOUT;
956 goto out;
957
958 gotreply:
959 out:
960 soclose(so, FNONBLOCK);
961 return error;
962 }
963
964
965 static int
966 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
967 struct bootpc_globalcontext *gctx,
968 struct thread *td)
969 {
970 struct ifaddr_container *ifac;
971 struct sockaddr_in *sin;
972 int error;
973
974 struct ifreq *ireq;
975 struct socket *so;
976 struct sockaddr_dl *sdl;
977
978 error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
979 if (error != 0)
980 panic("nfs_boot: socreate, error=%d", error);
981
982 ireq = &ifctx->ireq;
983 so = ifctx->so;
984
985 /*
986 * Bring up the interface.
987 *
988 * Get the old interface flags and or IFF_UP into them; if
989 * IFF_UP set blindly, interface selection can be clobbered.
990 */
991 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
992 if (error != 0)
993 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
994 ireq->ifr_flags |= IFF_UP;
995 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
996 if (error != 0)
997 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
998
999 /*
1000 * Do enough of ifconfig(8) so that the chosen interface
1001 * can talk to the servers. (just set the address)
1002 */
1003
1004 /* addr is 0.0.0.0 */
1005
1006 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1007 clear_sinaddr(sin);
1008 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1009 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1010 panic("bootpc_fakeup_interface: "
1011 "set if addr, error=%d", error);
1012
1013 /* netmask is 255.0.0.0 */
1014
1015 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1016 clear_sinaddr(sin);
1017 sin->sin_addr.s_addr = htonl(0xff000000u);
1018 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
1019 if (error != 0)
1020 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1021 error);
1022
1023 /* Broadcast is 255.255.255.255 */
1024
1025 sin = (struct sockaddr_in *)&ireq->ifr_addr;
1026 clear_sinaddr(sin);
1027 clear_sinaddr(&ifctx->broadcast);
1028 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1029 ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1030
1031 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
1032 if (error != 0 && error != EADDRNOTAVAIL)
1033 panic("bootpc_fakeup_interface: "
1034 "set if broadcast addr, error=%d",
1035 error);
1036 error = 0;
1037
1038 /* Get HW address */
1039
1040 sdl = NULL;
1041 TAILQ_FOREACH(ifac, &ifctx->ifp->if_addrheads[mycpuid], ifa_link) {
1042 struct ifaddr *ifa = ifac->ifa;
1043
1044 if (ifa->ifa_addr->sa_family == AF_LINK &&
1045 (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1046 sdl->sdl_type == IFT_ETHER)
1047 break;
1048 }
1049
1050 if (sdl == NULL)
1051 panic("bootpc: Unable to find HW address for %s",
1052 ifctx->ireq.ifr_name);
1053 ifctx->sdl = sdl;
1054
1055 return error;
1056 }
1057
1058
1059 static int
1060 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1061 struct bootpc_globalcontext *gctx,
1062 struct thread *td)
1063 {
1064 int error;
1065 struct sockaddr_in defdst;
1066 struct sockaddr_in defmask;
1067 struct sockaddr_in *sin;
1068
1069 struct ifreq *ireq;
1070 struct socket *so;
1071 struct sockaddr_in *myaddr;
1072 struct sockaddr_in *netmask;
1073 struct sockaddr_in *gw;
1074
1075 ireq = &ifctx->ireq;
1076 so = ifctx->so;
1077 myaddr = &ifctx->myaddr;
1078 netmask = &ifctx->netmask;
1079 gw = &ifctx->gw;
1080
1081 if (bootpc_ifctx_isresolved(ifctx) == 0) {
1082
1083 /* Shutdown interfaces where BOOTP failed */
1084
1085 kprintf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1086 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1087 if (error != 0)
1088 panic("bootpc_adjust_interface: "
1089 "SIOCGIFFLAGS, error=%d", error);
1090 ireq->ifr_flags &= ~IFF_UP;
1091 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1092 if (error != 0)
1093 panic("bootpc_adjust_interface: "
1094 "SIOCSIFFLAGS, error=%d", error);
1095
1096 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1097 clear_sinaddr(sin);
1098 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
1099 if (error != 0 && (error != EADDRNOTAVAIL ||
1100 ifctx == gctx->interfaces))
1101 panic("bootpc_adjust_interface: "
1102 "SIOCDIFADDR, error=%d", error);
1103
1104 return 0;
1105 }
1106
1107 kprintf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1108 /*
1109 * Do enough of ifconfig(8) so that the chosen interface
1110 * can talk to the servers. (just set the address)
1111 */
1112 bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1113 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
1114 if (error != 0)
1115 panic("bootpc_adjust_interface: "
1116 "set if netmask, error=%d", error);
1117
1118 /* Broadcast is with host part of IP address all 1's */
1119
1120 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1121 clear_sinaddr(sin);
1122 sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1123 ~ netmask->sin_addr.s_addr;
1124 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
1125 if (error != 0)
1126 panic("bootpc_adjust_interface: "
1127 "set if broadcast addr, error=%d", error);
1128
1129 bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1130 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1131 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1132 panic("bootpc_adjust_interface: "
1133 "set if addr, error=%d", error);
1134
1135 /* Add new default route */
1136
1137 if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1138 clear_sinaddr(&defdst);
1139 clear_sinaddr(&defmask);
1140 error = rtrequest_global(RTM_ADD, (struct sockaddr *) &defdst,
1141 (struct sockaddr *) gw,
1142 (struct sockaddr *) &defmask,
1143 (RTF_UP | RTF_GATEWAY | RTF_STATIC));
1144 if (error != 0) {
1145 kprintf("bootpc_adjust_interface: "
1146 "add net route, error=%d\n", error);
1147 return error;
1148 }
1149 }
1150
1151 return 0;
1152 }
1153
1154 static void
1155 print_sin_addr(struct sockaddr_in *sin)
1156 {
1157 print_in_addr(sin->sin_addr);
1158 }
1159
1160
1161 static void
1162 print_in_addr(struct in_addr addr)
1163 {
1164 unsigned int ip;
1165
1166 ip = ntohl(addr.s_addr);
1167 kprintf("%d.%d.%d.%d",
1168 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1169 }
1170
1171 static void
1172 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1173 struct bootpc_globalcontext *gctx, struct thread *td)
1174 {
1175 unsigned char *vendp;
1176 unsigned char vendor_client[64];
1177 uint32_t leasetime;
1178 uint8_t vendor_client_len;
1179
1180 ifctx->gotrootpath = 0;
1181
1182 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1183
1184 /* bootpc part */
1185 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */
1186 ifctx->call.htype = 1; /* 10mb ethernet */
1187 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1188 ifctx->call.hops = 0;
1189 if (bootpc_ifctx_isunresolved(ifctx) != 0)
1190 ifctx->xid++;
1191 ifctx->call.xid = txdr_unsigned(ifctx->xid);
1192 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1193
1194 vendp = ifctx->call.vend;
1195 *vendp++ = 99; /* RFC1048 cookie */
1196 *vendp++ = 130;
1197 *vendp++ = 83;
1198 *vendp++ = 99;
1199 *vendp++ = TAG_MAXMSGSIZE;
1200 *vendp++ = 2;
1201 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1202 *vendp++ = sizeof(struct bootp_packet) & 255;
1203
1204 ksnprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1205 ostype, MACHINE, osrelease);
1206 vendor_client_len = strlen(vendor_client);
1207 *vendp++ = TAG_VENDOR_INDENTIFIER;
1208 *vendp++ = vendor_client_len;
1209 memcpy(vendp, vendor_client, vendor_client_len);
1210 vendp += vendor_client_len;
1211 ifctx->dhcpquerytype = DHCP_NOMSG;
1212 switch (ifctx->state) {
1213 case IF_DHCP_UNRESOLVED:
1214 *vendp++ = TAG_DHCP_MSGTYPE;
1215 *vendp++ = 1;
1216 *vendp++ = DHCP_DISCOVER;
1217 ifctx->dhcpquerytype = DHCP_DISCOVER;
1218 ifctx->gotdhcpserver = 0;
1219 break;
1220 case IF_DHCP_OFFERED:
1221 *vendp++ = TAG_DHCP_MSGTYPE;
1222 *vendp++ = 1;
1223 *vendp++ = DHCP_REQUEST;
1224 ifctx->dhcpquerytype = DHCP_REQUEST;
1225 *vendp++ = TAG_DHCP_REQ_ADDR;
1226 *vendp++ = 4;
1227 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1228 vendp += 4;
1229 if (ifctx->gotdhcpserver != 0) {
1230 *vendp++ = TAG_DHCP_SERVERID;
1231 *vendp++ = 4;
1232 memcpy(vendp, &ifctx->dhcpserver, 4);
1233 vendp += 4;
1234 }
1235 *vendp++ = TAG_DHCP_LEASETIME;
1236 *vendp++ = 4;
1237 leasetime = htonl(300);
1238 memcpy(vendp, &leasetime, 4);
1239 vendp += 4;
1240 default:
1241 ;
1242 }
1243 *vendp = TAG_END;
1244
1245 ifctx->call.secs = 0;
1246 ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1247 }
1248
1249
1250 static int
1251 bootpc_hascookie(struct bootp_packet *bp)
1252 {
1253 return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1254 bp->vend[2] == 83 && bp->vend[3] == 99);
1255 }
1256
1257
1258 static void
1259 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1260 unsigned char *start, int len, int tag)
1261 {
1262 unsigned char *j;
1263 unsigned char *ej;
1264 unsigned char code;
1265
1266 if (tctx->badtag != 0 || tctx->badopt != 0)
1267 return;
1268
1269 j = start;
1270 ej = j + len;
1271
1272 while (j < ej) {
1273 code = *j++;
1274 if (code == TAG_PAD)
1275 continue;
1276 if (code == TAG_END)
1277 return;
1278 if (j >= ej || j + *j + 1 > ej) {
1279 tctx->badopt = 1;
1280 return;
1281 }
1282 len = *j++;
1283 if (code == tag) {
1284 if (tctx->taglen + len > TAG_MAXLEN) {
1285 tctx->badtag = 1;
1286 return;
1287 }
1288 tctx->foundopt = 1;
1289 if (len > 0)
1290 memcpy(tctx->buf + tctx->taglen,
1291 j, len);
1292 tctx->taglen += len;
1293 }
1294 if (code == TAG_OVERLOAD)
1295 tctx->overload = *j;
1296
1297 j += len;
1298 }
1299 }
1300
1301
1302 static unsigned char *
1303 bootpc_tag(struct bootpc_tagcontext *tctx, struct bootp_packet *bp,
1304 int len, int tag)
1305 {
1306 unsigned char *j;
1307 unsigned char *ej;
1308
1309 tctx->overload = 0;
1310 tctx->badopt = 0;
1311 tctx->badtag = 0;
1312 tctx->foundopt = 0;
1313 tctx->taglen = 0;
1314
1315 if (bootpc_hascookie(bp) == 0)
1316 return NULL;
1317
1318 j = &bp->vend[4];
1319 ej = (unsigned char *) bp + len;
1320
1321 bootpc_tag_helper(tctx, &bp->vend[4],
1322 (unsigned char *) bp + len - &bp->vend[4], tag);
1323
1324 if ((tctx->overload & OVERLOAD_FILE) != 0)
1325 bootpc_tag_helper(tctx,
1326 (unsigned char *) bp->file,
1327 sizeof(bp->file),
1328 tag);
1329 if ((tctx->overload & OVERLOAD_SNAME) != 0)
1330 bootpc_tag_helper(tctx,
1331 (unsigned char *) bp->sname,
1332 sizeof(bp->sname),
1333 tag);
1334
1335 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1336 return NULL;
1337 tctx->buf[tctx->taglen] = '\0';
1338 return tctx->buf;
1339 }
1340
1341
1342 static void
1343 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1344 struct bootpc_globalcontext *gctx)
1345 {
1346 char *p;
1347 unsigned int ip;
1348
1349 ifctx->gotgw = 0;
1350 ifctx->gotnetmask = 0;
1351
1352 clear_sinaddr(&ifctx->myaddr);
1353 clear_sinaddr(&ifctx->netmask);
1354 clear_sinaddr(&ifctx->gw);
1355
1356 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1357
1358 ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1359 ksnprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1360 "swap.%d.%d.%d.%d",
1361 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1362
1363 kprintf("%s at ", ifctx->ireq.ifr_name);
1364 print_sin_addr(&ifctx->myaddr);
1365 kprintf(" server ");
1366 print_in_addr(ifctx->reply.siaddr);
1367
1368 ifctx->gw.sin_addr = ifctx->reply.giaddr;
1369 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1370 kprintf(" via gateway ");
1371 print_in_addr(ifctx->reply.giaddr);
1372 }
1373
1374 /* This call used for the side effect (overload flag) */
1375 (void) bootpc_tag(&gctx->tmptag,
1376 &ifctx->reply, ifctx->replylen, TAG_END);
1377
1378 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1379 if (ifctx->reply.sname[0] != '\0')
1380 kprintf(" server name %s", ifctx->reply.sname);
1381 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1382 if (ifctx->reply.file[0] != '\0')
1383 kprintf(" boot file %s", ifctx->reply.file);
1384
1385 kprintf("\n");
1386
1387 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1388 TAG_SUBNETMASK);
1389 if (p != NULL) {
1390 if (gctx->tag.taglen != 4)
1391 panic("bootpc: subnet mask len is %d",
1392 gctx->tag.taglen);
1393 bcopy(p, &ifctx->netmask.sin_addr, 4);
1394 ifctx->gotnetmask = 1;
1395 kprintf("subnet mask ");
1396 print_sin_addr(&ifctx->netmask);
1397 kprintf(" ");
1398 }
1399
1400 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1401 TAG_ROUTERS);
1402 if (p != NULL) {
1403 /* Routers */
1404 if (gctx->tag.taglen % 4)
1405 panic("bootpc: Router Len is %d", gctx->tag.taglen);
1406 if (gctx->tag.taglen > 0) {
1407 bcopy(p, &ifctx->gw.sin_addr, 4);
1408 kprintf("router ");
1409 print_sin_addr(&ifctx->gw);
1410 kprintf(" ");
1411 ifctx->gotgw = 1;
1412 gctx->gotgw = 1;
1413 }
1414 }
1415
1416 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1417 TAG_ROOT);
1418 if (p != NULL) {
1419 if (gctx->setrootfs != NULL) {
1420 kprintf("rootfs %s (ignored) ", p);
1421 } else if (setfs(&nd->root_saddr,
1422 nd->root_hostnam, p)) {
1423 kprintf("rootfs %s ",p);
1424 gctx->gotrootpath = 1;
1425 ifctx->gotrootpath = 1;
1426 gctx->setrootfs = ifctx;
1427
1428 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1429 ifctx->replylen,
1430 TAG_ROOTOPTS);
1431 if (p != NULL) {
1432 mountopts(&nd->root_args, p);
1433 kprintf("rootopts %s ", p);
1434 }
1435 } else
1436 panic("Failed to set rootfs to %s",p);
1437 }
1438
1439 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1440 TAG_SWAP);
1441 if (p != NULL) {
1442 if (gctx->setswapfs != NULL) {
1443 kprintf("swapfs %s (ignored) ", p);
1444 } else if (setfs(&nd->swap_saddr,
1445 nd->swap_hostnam, p)) {
1446 gctx->gotswappath = 1;
1447 gctx->setswapfs = ifctx;
1448 kprintf("swapfs %s ", p);
1449
1450 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1451 ifctx->replylen,
1452 TAG_SWAPOPTS);
1453 if (p != NULL) {
1454 /* swap mount options */
1455 mountopts(&nd->swap_args, p);
1456 kprintf("swapopts %s ", p);
1457 }
1458
1459 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1460 ifctx->replylen,
1461 TAG_SWAPSIZE);
1462 if (p != NULL) {
1463 int swaplen;
1464 if (gctx->tag.taglen != 4)
1465 panic("bootpc: "
1466 "Expected 4 bytes for swaplen, "
1467 "not %d bytes",
1468 gctx->tag.taglen);
1469 bcopy(p, &swaplen, 4);
1470 nd->swap_nblks = ntohl(swaplen);
1471 kprintf("swapsize %d KB ",
1472 nd->swap_nblks);
1473 }
1474 } else
1475 panic("Failed to set swapfs to %s", p);
1476 }
1477
1478 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1479 TAG_HOSTNAME);
1480 if (p != NULL) {
1481 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1482 panic("bootpc: hostname >= %d bytes",
1483 MAXHOSTNAMELEN);
1484 if (gctx->sethostname != NULL) {
1485 kprintf("hostname %s (ignored) ", p);
1486 } else {
1487 strcpy(nd->my_hostnam, p);
1488 strcpy(hostname, p);
1489 kprintf("hostname %s ",hostname);
1490 gctx->sethostname = ifctx;
1491 }
1492 }
1493 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1494 TAG_COOKIE);
1495 if (p != NULL) { /* store in a sysctl variable */
1496 int i, l = sizeof(bootp_cookie) - 1;
1497 for (i = 0; i < l && p[i] != '\0'; i++)
1498 bootp_cookie[i] = p[i];
1499 p[i] = '\0';
1500 }
1501
1502 kprintf("\n");
1503
1504 if (ifctx->gotnetmask == 0) {
1505 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1506 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1507 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1508 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1509 else
1510 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1511 }
1512 if (ifctx->gotgw == 0) {
1513 /* Use proxyarp */
1514 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1515 }
1516 }
1517
1518 void
1519 bootpc_init(void)
1520 {
1521 struct bootpc_ifcontext *ifctx, *nctx; /* Interface BOOTP contexts */
1522 struct bootpc_globalcontext *gctx; /* Global BOOTP context */
1523 struct ifnet *ifp;
1524 int error;
1525 struct nfsv3_diskless *nd;
1526 struct thread *td;
1527
1528 nd = &nfsv3_diskless;
1529 td = curthread;
1530
1531 /*
1532 * If already filled in, don't touch it here
1533 */
1534 if (nfs_diskless_valid != 0)
1535 return;
1536
1537 /*
1538 * Wait until arp entries can be handled.
1539 */
1540 while (time_second == 0)
1541 tsleep(&time_second, 0, "arpkludge", 10);
1542
1543 gctx = kmalloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1544
1545 gctx->xid = ~0xFFFF;
1546 gctx->starttime = time_second;
1547
1548 ifctx = allocifctx(gctx);
1549
1550 /*
1551 * Find a network interface.
1552 */
1553 #ifdef BOOTP_WIRED_TO
1554 kprintf("bootpc_init: wired to interface '%s'\n",
1555 __XSTRING(BOOTP_WIRED_TO));
1556 #endif
1557 bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1558 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1559 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1560 sizeof(ifctx->ireq.ifr_name));
1561 #ifdef BOOTP_WIRED_TO
1562 if (strcmp(ifctx->ireq.ifr_name,
1563 __XSTRING(BOOTP_WIRED_TO)) != 0)
1564 continue;
1565 #else
1566 if ((ifp->if_flags &
1567 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1568 IFF_BROADCAST)
1569 continue;
1570 #endif
1571 if (gctx->interfaces != NULL)
1572 gctx->lastinterface->next = ifctx;
1573 else
1574 gctx->interfaces = ifctx;
1575 ifctx->ifp = ifp;
1576 gctx->lastinterface = ifctx;
1577 ifctx = allocifctx(gctx);
1578 }
1579 kfree(ifctx, M_TEMP);
1580
1581 if (gctx->interfaces == NULL) {
1582 #ifdef BOOTP_WIRED_TO
1583 panic("bootpc_init: Could not find interface specified "
1584 "by BOOTP_WIRED_TO: "
1585 __XSTRING(BOOTP_WIRED_TO));
1586 #else
1587 panic("bootpc_init: no suitable interface");
1588 #endif
1589 }
1590
1591 gctx->gotrootpath = 0;
1592 gctx->gotswappath = 0;
1593 gctx->gotgw = 0;
1594
1595 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1596 bootpc_fakeup_interface(ifctx, gctx, td);
1597
1598 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1599 bootpc_compose_query(ifctx, gctx, td);
1600
1601 ifctx = gctx->interfaces;
1602 error = bootpc_call(gctx, td);
1603
1604 if (error != 0) {
1605 #ifdef BOOTP_NFSROOT
1606 panic("BOOTP call failed");
1607 #else
1608 kprintf("BOOTP call failed\n");
1609 #endif
1610 }
1611
1612 mountopts(&nd->root_args, NULL);
1613
1614 mountopts(&nd->swap_args, NULL);
1615
1616 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1617 if (bootpc_ifctx_isresolved(ifctx) != 0)
1618 bootpc_decode_reply(nd, ifctx, gctx);
1619
1620 if (gctx->gotswappath == 0)
1621 nd->swap_nblks = 0;
1622 #ifdef BOOTP_NFSROOT
1623 if (gctx->gotrootpath == 0)
1624 panic("bootpc: No root path offered");
1625 #endif
1626
1627 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1628 bootpc_adjust_interface(ifctx, gctx, td);
1629
1630 soclose(ifctx->so, FNONBLOCK);
1631 }
1632
1633 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1634 if (ifctx->gotrootpath != 0)
1635 break;
1636 if (ifctx == NULL) {
1637 for (ifctx = gctx->interfaces;
1638 ifctx != NULL;
1639 ifctx = ifctx->next)
1640 if (bootpc_ifctx_isresolved(ifctx) != 0)
1641 break;
1642 }
1643 if (ifctx == NULL)
1644 goto out;
1645
1646 if (gctx->gotrootpath != 0) {
1647
1648 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1649 nd->root_fh, &nd->root_fhsize,
1650 &nd->root_args, td);
1651 if (error != 0)
1652 panic("nfs_boot: mountd root, error=%d", error);
1653
1654 if (gctx->gotswappath != 0) {
1655
1656 error = md_mount(&nd->swap_saddr,
1657 nd->swap_hostnam,
1658 nd->swap_fh, &nd->swap_fhsize,
1659 &nd->swap_args, td);
1660 if (error != 0)
1661 panic("nfs_boot: mountd swap, error=%d",
1662 error);
1663
1664 error = md_lookup_swap(&nd->swap_saddr,
1665 gctx->lookup_path,
1666 nd->swap_fh, &nd->swap_fhsize,
1667 &nd->swap_args, td);
1668 if (error != 0)
1669 panic("nfs_boot: lookup swap, error=%d",
1670 error);
1671 }
1672 nfs_diskless_valid = 3;
1673 }
1674
1675 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1676 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1677 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1678 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1679 ifctx->myaddr.sin_addr.s_addr |
1680 ~ ifctx->netmask.sin_addr.s_addr;
1681 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1682
1683 out:
1684 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1685 nctx = ifctx->next;
1686 kfree(ifctx, M_TEMP);
1687 }
1688 kfree(gctx, M_TEMP);
1689 }
1690
DragonFly BSD