1 /*-
2 * Copyright (c) 1995 Gordon Ross, Adam Glass
3 * Copyright (c) 1992 Regents of the University of California.
4 * All rights reserved.
5 *
6 * This software was developed by the Computer Systems Engineering group
7 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
8 * contributed to Berkeley.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Lawrence Berkeley Laboratory and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * based on:
39 * nfs/krpc_subr.c
40 * $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
41 */
42
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD: releng/8.1/sys/nfsclient/bootp_subr.c 203786 2010-02-11 18:34:06Z mjacob $");
45
46 #include "opt_bootp.h"
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/jail.h>
51 #include <sys/kernel.h>
52 #include <sys/sockio.h>
53 #include <sys/malloc.h>
54 #include <sys/mount.h>
55 #include <sys/mbuf.h>
56 #include <sys/proc.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/sysctl.h>
60 #include <sys/uio.h>
61
62 #include <net/if.h>
63 #include <net/route.h>
64
65 #include <netinet/in.h>
66 #include <net/if_types.h>
67 #include <net/if_dl.h>
68 #include <net/vnet.h>
69
70 #include <nfs/nfsproto.h>
71 #include <nfsclient/nfs.h>
72 #include <nfsclient/nfsdiskless.h>
73 #include <nfsclient/krpc.h>
74 #include <nfs/xdr_subs.h>
75
76
77 #define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */
78
79 #ifndef BOOTP_SETTLE_DELAY
80 #define BOOTP_SETTLE_DELAY 3
81 #endif
82
83 /*
84 * What is the longest we will wait before re-sending a request?
85 * Note this is also the frequency of "RPC timeout" messages.
86 * The re-send loop count sup linearly to this maximum, so the
87 * first complaint will happen after (1+2+3+4+5)=15 seconds.
88 */
89 #define MAX_RESEND_DELAY 5 /* seconds */
90
91 /* Definitions from RFC951 */
92 struct bootp_packet {
93 u_int8_t op;
94 u_int8_t htype;
95 u_int8_t hlen;
96 u_int8_t hops;
97 u_int32_t xid;
98 u_int16_t secs;
99 u_int16_t flags;
100 struct in_addr ciaddr;
101 struct in_addr yiaddr;
102 struct in_addr siaddr;
103 struct in_addr giaddr;
104 unsigned char chaddr[16];
105 char sname[64];
106 char file[128];
107 unsigned char vend[1222];
108 };
109
110 struct bootpc_ifcontext {
111 struct bootpc_ifcontext *next;
112 struct bootp_packet call;
113 struct bootp_packet reply;
114 int replylen;
115 int overload;
116 struct socket *so;
117 struct ifreq ireq;
118 struct ifnet *ifp;
119 struct sockaddr_dl *sdl;
120 struct sockaddr_in myaddr;
121 struct sockaddr_in netmask;
122 struct sockaddr_in gw;
123 struct sockaddr_in broadcast; /* Different for each interface */
124 int gotgw;
125 int gotnetmask;
126 int gotrootpath;
127 int outstanding;
128 int sentmsg;
129 u_int32_t xid;
130 enum {
131 IF_BOOTP_UNRESOLVED,
132 IF_BOOTP_RESOLVED,
133 IF_BOOTP_FAILED,
134 IF_DHCP_UNRESOLVED,
135 IF_DHCP_OFFERED,
136 IF_DHCP_RESOLVED,
137 IF_DHCP_FAILED,
138 } state;
139 int dhcpquerytype; /* dhcp type sent */
140 struct in_addr dhcpserver;
141 int gotdhcpserver;
142 };
143
144 #define TAG_MAXLEN 1024
145 struct bootpc_tagcontext {
146 char buf[TAG_MAXLEN + 1];
147 int overload;
148 int badopt;
149 int badtag;
150 int foundopt;
151 int taglen;
152 };
153
154 struct bootpc_globalcontext {
155 struct bootpc_ifcontext *interfaces;
156 struct bootpc_ifcontext *lastinterface;
157 u_int32_t xid;
158 int gotrootpath;
159 int gotgw;
160 int ifnum;
161 int secs;
162 int starttime;
163 struct bootp_packet reply;
164 int replylen;
165 struct bootpc_ifcontext *setrootfs;
166 struct bootpc_ifcontext *sethostname;
167 struct bootpc_tagcontext tmptag;
168 struct bootpc_tagcontext tag;
169 };
170
171 #define IPPORT_BOOTPC 68
172 #define IPPORT_BOOTPS 67
173
174 #define BOOTP_REQUEST 1
175 #define BOOTP_REPLY 2
176
177 /* Common tags */
178 #define TAG_PAD 0 /* Pad option, implicit length 1 */
179 #define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */
180 #define TAG_ROUTERS 3 /* Routers (in order of preference) */
181 #define TAG_HOSTNAME 12 /* Client host name */
182 #define TAG_ROOT 17 /* Root path */
183
184 /* DHCP specific tags */
185 #define TAG_OVERLOAD 52 /* Option Overload */
186 #define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */
187
188 #define TAG_END 255 /* End Option (i.e. no more options) */
189
190 /* Overload values */
191 #define OVERLOAD_FILE 1
192 #define OVERLOAD_SNAME 2
193
194 /* Site specific tags: */
195 #define TAG_ROOTOPTS 130
196 #define TAG_COOKIE 134 /* ascii info for userland, via sysctl */
197
198 #define TAG_DHCP_MSGTYPE 53
199 #define TAG_DHCP_REQ_ADDR 50
200 #define TAG_DHCP_SERVERID 54
201 #define TAG_DHCP_LEASETIME 51
202
203 #define TAG_VENDOR_INDENTIFIER 60
204
205 #define DHCP_NOMSG 0
206 #define DHCP_DISCOVER 1
207 #define DHCP_OFFER 2
208 #define DHCP_REQUEST 3
209 #define DHCP_ACK 5
210
211 /* NFS read/write block size */
212 #ifndef BOOTP_BLOCKSIZE
213 #define BOOTP_BLOCKSIZE 8192
214 #endif
215
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 int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp,
222 int *fhsizep, struct nfs_args *args, struct thread *td);
223 static int setfs(struct sockaddr_in *addr, char *path, char *p,
224 const struct in_addr *siaddr);
225 static int getdec(char **ptr);
226 static int getip(char **ptr, struct in_addr *ip);
227 static void mountopts(struct nfs_args *args, char *p);
228 static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
229 static int xdr_int_decode(struct mbuf **ptr, int *iptr);
230 static void print_in_addr(struct in_addr addr);
231 static void print_sin_addr(struct sockaddr_in *addr);
232 static void clear_sinaddr(struct sockaddr_in *sin);
233 static void allocifctx(struct bootpc_globalcontext *gctx);
234 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
235 struct bootpc_globalcontext *gctx, struct thread *td);
236 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
237 struct bootp_packet *bp, int len, int tag);
238 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
239 unsigned char *start, int len, int tag);
240
241 #ifdef BOOTP_DEBUG
242 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma);
243 void bootpboot_p_rtentry(struct rtentry *rt);
244 void bootpboot_p_tree(struct radix_node *rn);
245 void bootpboot_p_rtlist(void);
246 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
247 void bootpboot_p_iflist(void);
248 #endif
249
250 static int bootpc_call(struct bootpc_globalcontext *gctx,
251 struct thread *td);
252
253 static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
254 struct bootpc_globalcontext *gctx, struct thread *td);
255
256 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
257 struct bootpc_globalcontext *gctx, struct thread *td);
258
259 static void bootpc_decode_reply(struct nfsv3_diskless *nd,
260 struct bootpc_ifcontext *ifctx,
261 struct bootpc_globalcontext *gctx);
262
263 static int bootpc_received(struct bootpc_globalcontext *gctx,
264 struct bootpc_ifcontext *ifctx);
265
266 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
267 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
268 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
269
270 /*
271 * In order to have multiple active interfaces with address 0.0.0.0
272 * and be able to send data to a selected interface, we perform
273 * some tricks:
274 *
275 * - The 'broadcast' address is different for each interface.
276 *
277 * - We temporarily add routing pointing 255.255.255.255 to the
278 * selected interface broadcast address, thus the packet sent
279 * goes to that interface.
280 */
281
282 #ifdef BOOTP_DEBUG
283 void
284 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
285 {
286
287 if (sa == NULL) {
288 printf("(sockaddr *) <null>");
289 return;
290 }
291 switch (sa->sa_family) {
292 case AF_INET:
293 {
294 struct sockaddr_in *sin;
295
296 sin = (struct sockaddr_in *) sa;
297 printf("inet ");
298 print_sin_addr(sin);
299 if (ma != NULL) {
300 sin = (struct sockaddr_in *) ma;
301 printf(" mask ");
302 print_sin_addr(sin);
303 }
304 }
305 break;
306 case AF_LINK:
307 {
308 struct sockaddr_dl *sli;
309 int i;
310
311 sli = (struct sockaddr_dl *) sa;
312 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
313 for (i = 0; i < sli->sdl_alen; i++) {
314 if (i > 0)
315 printf(":");
316 printf("%x", ((unsigned char *) LLADDR(sli))[i]);
317 }
318 }
319 break;
320 default:
321 printf("af%d", sa->sa_family);
322 }
323 }
324
325 void
326 bootpboot_p_rtentry(struct rtentry *rt)
327 {
328
329 bootpboot_p_sa(rt_key(rt), rt_mask(rt));
330 printf(" ");
331 bootpboot_p_sa(rt->rt_gateway, NULL);
332 printf(" ");
333 printf("flags %x", (unsigned short) rt->rt_flags);
334 printf(" %d", (int) rt->rt_rmx.rmx_expire);
335 printf(" %s\n", rt->rt_ifp->if_xname);
336 }
337
338 void
339 bootpboot_p_tree(struct radix_node *rn)
340 {
341
342 while (rn != NULL) {
343 if (rn->rn_bit < 0) {
344 if ((rn->rn_flags & RNF_ROOT) != 0) {
345 } else {
346 bootpboot_p_rtentry((struct rtentry *) rn);
347 }
348 rn = rn->rn_dupedkey;
349 } else {
350 bootpboot_p_tree(rn->rn_left);
351 bootpboot_p_tree(rn->rn_right);
352 return;
353 }
354 }
355 }
356
357 void
358 bootpboot_p_rtlist(void)
359 {
360 struct radix_node_head *rnh;
361
362 printf("Routing table:\n");
363 rnh = rt_tables_get_rnh(0, AF_INET);
364 if (rnh == NULL)
365 return;
366 RADIX_NODE_HEAD_RLOCK(rnh); /* could sleep XXX */
367 bootpboot_p_tree(rnh->rnh_treetop);
368 RADIX_NODE_HEAD_RUNLOCK(rnh);
369 }
370
371 void
372 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
373 {
374
375 printf("%s flags %x, addr ",
376 ifp->if_xname, ifp->if_flags);
377 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
378 printf(", broadcast ");
379 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
380 printf(", netmask ");
381 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
382 printf("\n");
383 }
384
385 void
386 bootpboot_p_iflist(void)
387 {
388 struct ifnet *ifp;
389 struct ifaddr *ifa;
390
391 printf("Interface list:\n");
392 IFNET_RLOCK();
393 for (ifp = TAILQ_FIRST(&V_ifnet);
394 ifp != NULL;
395 ifp = TAILQ_NEXT(ifp, if_link)) {
396 for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
397 ifa != NULL;
398 ifa = TAILQ_NEXT(ifa, ifa_link))
399 if (ifa->ifa_addr->sa_family == AF_INET)
400 bootpboot_p_if(ifp, ifa);
401 }
402 IFNET_RUNLOCK();
403 }
404 #endif /* defined(BOOTP_DEBUG) */
405
406 static void
407 clear_sinaddr(struct sockaddr_in *sin)
408 {
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 static void
418 allocifctx(struct bootpc_globalcontext *gctx)
419 {
420 struct bootpc_ifcontext *ifctx;
421 ifctx = (struct bootpc_ifcontext *) malloc(sizeof(*ifctx),
422 M_TEMP, M_WAITOK | M_ZERO);
423 if (ifctx == NULL)
424 panic("Failed to allocate bootp interface context structure");
425
426 ifctx->xid = gctx->xid;
427 #ifdef BOOTP_NO_DHCP
428 ifctx->state = IF_BOOTP_UNRESOLVED;
429 #else
430 ifctx->state = IF_DHCP_UNRESOLVED;
431 #endif
432 gctx->xid += 0x100;
433 if (gctx->interfaces != NULL)
434 gctx->lastinterface->next = ifctx;
435 else
436 gctx->interfaces = ifctx;
437 gctx->lastinterface = ifctx;
438 }
439
440 static __inline int
441 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
442 {
443
444 if (ifctx->state == IF_BOOTP_RESOLVED ||
445 ifctx->state == IF_DHCP_RESOLVED)
446 return 1;
447 return 0;
448 }
449
450 static __inline int
451 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
452 {
453
454 if (ifctx->state == IF_BOOTP_UNRESOLVED ||
455 ifctx->state == IF_DHCP_UNRESOLVED)
456 return 1;
457 return 0;
458 }
459
460 static __inline int
461 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
462 {
463
464 if (ifctx->state == IF_BOOTP_FAILED ||
465 ifctx->state == IF_DHCP_FAILED)
466 return 1;
467 return 0;
468 }
469
470 static int
471 bootpc_received(struct bootpc_globalcontext *gctx,
472 struct bootpc_ifcontext *ifctx)
473 {
474 unsigned char dhcpreplytype;
475 char *p;
476
477 /*
478 * Need timeout for fallback to less
479 * desirable alternative.
480 */
481
482 /* This call used for the side effect (badopt flag) */
483 (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
484 gctx->replylen,
485 TAG_END);
486
487 /* If packet is invalid, ignore it */
488 if (gctx->tmptag.badopt != 0)
489 return 0;
490
491 p = bootpc_tag(&gctx->tmptag, &gctx->reply,
492 gctx->replylen, TAG_DHCP_MSGTYPE);
493 if (p != NULL)
494 dhcpreplytype = *p;
495 else
496 dhcpreplytype = DHCP_NOMSG;
497
498 switch (ifctx->dhcpquerytype) {
499 case DHCP_DISCOVER:
500 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */
501 #ifndef BOOTP_FORCE_DHCP
502 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */
503 #endif
504 )
505 return 0;
506 break;
507 case DHCP_REQUEST:
508 if (dhcpreplytype != DHCP_ACK)
509 return 0;
510 case DHCP_NOMSG:
511 break;
512 }
513
514 /* Ignore packet unless it gives us a root tag we didn't have */
515
516 if ((ifctx->state == IF_BOOTP_RESOLVED ||
517 (ifctx->dhcpquerytype == DHCP_DISCOVER &&
518 (ifctx->state == IF_DHCP_OFFERED ||
519 ifctx->state == IF_DHCP_RESOLVED))) &&
520 (bootpc_tag(&gctx->tmptag, &ifctx->reply,
521 ifctx->replylen,
522 TAG_ROOT) != NULL ||
523 bootpc_tag(&gctx->tmptag, &gctx->reply,
524 gctx->replylen,
525 TAG_ROOT) == NULL))
526 return 0;
527
528 bcopy(&gctx->reply, &ifctx->reply, 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 CURVNET_SET(TD_TO_VNET(td));
588
589 /*
590 * Create socket and set its recieve timeout.
591 */
592 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td);
593 if (error != 0)
594 goto out0;
595
596 tv.tv_sec = 1;
597 tv.tv_usec = 0;
598 bzero(&sopt, sizeof(sopt));
599 sopt.sopt_dir = SOPT_SET;
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 printf("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 printf("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, td);
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 printf("bootpc_call: sosend: %d state %08x\n",
752 error, (int) so->so_state);
753 }
754
755 /* XXX: Is this needed ? */
756 pause("bootpw", hz/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, td);
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 printf("DHCP/BOOTP timeout for server ");
783 print_sin_addr(&dst);
784 printf("\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 printf("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 printf(" via ");
880 print_in_addr(gctx->reply.giaddr);
881 }
882 if (bootpc_received(gctx, ifctx) != 0) {
883 printf(" (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 printf(" (ignored)");
894 if (ifctx->gotrootpath) {
895 gotrootpath = 1;
896 rtimo = time_second +
897 BOOTP_SETTLE_DELAY;
898 printf(" (got root path)");
899 } else
900 printf(" (no root path)");
901 printf("\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 printf("%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 printf("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);
964 out0:
965 CURVNET_RESTORE();
966 return error;
967 }
968
969 static int
970 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
971 struct bootpc_globalcontext *gctx, struct thread *td)
972 {
973 struct sockaddr_in *sin;
974 int error;
975 struct ifreq *ireq;
976 struct socket *so;
977 struct ifaddr *ifa;
978 struct sockaddr_dl *sdl;
979
980 CURVNET_SET(TD_TO_VNET(td));
981
982 error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td->td_ucred, td);
983 if (error != 0)
984 panic("nfs_boot: socreate, error=%d", error);
985
986 ireq = &ifctx->ireq;
987 so = ifctx->so;
988
989 /*
990 * Bring up the interface.
991 *
992 * Get the old interface flags and or IFF_UP into them; if
993 * IFF_UP set blindly, interface selection can be clobbered.
994 */
995 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
996 if (error != 0)
997 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
998 ireq->ifr_flags |= IFF_UP;
999 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
1000 if (error != 0)
1001 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1002
1003 /*
1004 * Do enough of ifconfig(8) so that the chosen interface
1005 * can talk to the servers. (just set the address)
1006 */
1007
1008 /* addr is 0.0.0.0 */
1009
1010 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1011 clear_sinaddr(sin);
1012 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
1013 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1014 panic("bootpc_fakeup_interface: "
1015 "set if addr, error=%d", error);
1016
1017 /* netmask is 255.0.0.0 */
1018
1019 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1020 clear_sinaddr(sin);
1021 sin->sin_addr.s_addr = htonl(0xff000000u);
1022 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, td);
1023 if (error != 0)
1024 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1025 error);
1026
1027 /* Broadcast is 255.255.255.255 */
1028
1029 sin = (struct sockaddr_in *)&ireq->ifr_addr;
1030 clear_sinaddr(sin);
1031 clear_sinaddr(&ifctx->broadcast);
1032 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1033 ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1034
1035 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, td);
1036 if (error != 0)
1037 panic("bootpc_fakeup_interface: "
1038 "set if broadcast addr, error=%d",
1039 error);
1040
1041 /* Get HW address */
1042
1043 sdl = NULL;
1044 TAILQ_FOREACH(ifa, &ifctx->ifp->if_addrhead, ifa_link)
1045 if (ifa->ifa_addr->sa_family == AF_LINK) {
1046 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1047 if (sdl->sdl_type == IFT_ETHER)
1048 break;
1049 }
1050
1051 if (sdl == NULL)
1052 panic("bootpc: Unable to find HW address for %s",
1053 ifctx->ireq.ifr_name);
1054 ifctx->sdl = sdl;
1055
1056 CURVNET_RESTORE();
1057
1058 return error;
1059 }
1060
1061
1062 static int
1063 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1064 struct bootpc_globalcontext *gctx, struct thread *td)
1065 {
1066 int error;
1067 struct sockaddr_in defdst;
1068 struct sockaddr_in defmask;
1069 struct sockaddr_in *sin;
1070 struct ifreq *ireq;
1071 struct socket *so;
1072 struct sockaddr_in *myaddr;
1073 struct sockaddr_in *netmask;
1074 struct sockaddr_in *gw;
1075
1076 ireq = &ifctx->ireq;
1077 so = ifctx->so;
1078 myaddr = &ifctx->myaddr;
1079 netmask = &ifctx->netmask;
1080 gw = &ifctx->gw;
1081
1082 if (bootpc_ifctx_isresolved(ifctx) == 0) {
1083
1084 /* Shutdown interfaces where BOOTP failed */
1085
1086 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1087 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
1088 if (error != 0)
1089 panic("bootpc_adjust_interface: "
1090 "SIOCGIFFLAGS, error=%d", error);
1091 ireq->ifr_flags &= ~IFF_UP;
1092 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
1093 if (error != 0)
1094 panic("bootpc_adjust_interface: "
1095 "SIOCSIFFLAGS, error=%d", error);
1096
1097 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1098 clear_sinaddr(sin);
1099 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, td);
1100 if (error != 0 && (error != EEXIST ||
1101 ifctx == gctx->interfaces))
1102 panic("bootpc_adjust_interface: "
1103 "SIOCDIFADDR, error=%d", error);
1104
1105 return 0;
1106 }
1107
1108 printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1109 /*
1110 * Do enough of ifconfig(8) so that the chosen interface
1111 * can talk to the servers. (just set the address)
1112 */
1113 bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1114 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, td);
1115 if (error != 0)
1116 panic("bootpc_adjust_interface: "
1117 "set if netmask, error=%d", error);
1118
1119 /* Broadcast is with host part of IP address all 1's */
1120
1121 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1122 clear_sinaddr(sin);
1123 sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1124 ~ netmask->sin_addr.s_addr;
1125 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, td);
1126 if (error != 0)
1127 panic("bootpc_adjust_interface: "
1128 "set if broadcast addr, error=%d", error);
1129
1130 bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1131 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
1132 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1133 panic("bootpc_adjust_interface: "
1134 "set if addr, error=%d", error);
1135
1136 /* Add new default route */
1137
1138 if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1139 clear_sinaddr(&defdst);
1140 clear_sinaddr(&defmask);
1141 /* XXX MRT just table 0 */
1142 error = rtrequest_fib(RTM_ADD,
1143 (struct sockaddr *) &defdst,
1144 (struct sockaddr *) gw,
1145 (struct sockaddr *) &defmask,
1146 (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, 0);
1147 if (error != 0) {
1148 printf("bootpc_adjust_interface: "
1149 "add net route, error=%d\n", error);
1150 return error;
1151 }
1152 }
1153
1154 return 0;
1155 }
1156
1157 static int
1158 setfs(struct sockaddr_in *addr, char *path, char *p,
1159 const struct in_addr *siaddr)
1160 {
1161
1162 if (getip(&p, &addr->sin_addr) == 0) {
1163 if (siaddr != NULL && *p == '/')
1164 bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr));
1165 else
1166 return 0;
1167 } else {
1168 if (*p != ':')
1169 return 0;
1170 p++;
1171 }
1172
1173 addr->sin_len = sizeof(struct sockaddr_in);
1174 addr->sin_family = AF_INET;
1175
1176 strlcpy(path, p, MNAMELEN);
1177 return 1;
1178 }
1179
1180 static int
1181 getip(char **ptr, struct in_addr *addr)
1182 {
1183 char *p;
1184 unsigned int ip;
1185 int val;
1186
1187 p = *ptr;
1188 ip = 0;
1189 if (((val = getdec(&p)) < 0) || (val > 255))
1190 return 0;
1191 ip = val << 24;
1192 if (*p != '.')
1193 return 0;
1194 p++;
1195 if (((val = getdec(&p)) < 0) || (val > 255))
1196 return 0;
1197 ip |= (val << 16);
1198 if (*p != '.')
1199 return 0;
1200 p++;
1201 if (((val = getdec(&p)) < 0) || (val > 255))
1202 return 0;
1203 ip |= (val << 8);
1204 if (*p != '.')
1205 return 0;
1206 p++;
1207 if (((val = getdec(&p)) < 0) || (val > 255))
1208 return 0;
1209 ip |= val;
1210
1211 addr->s_addr = htonl(ip);
1212 *ptr = p;
1213 return 1;
1214 }
1215
1216 static int
1217 getdec(char **ptr)
1218 {
1219 char *p;
1220 int ret;
1221
1222 p = *ptr;
1223 ret = 0;
1224 if ((*p < '') || (*p > '9'))
1225 return -1;
1226 while ((*p >= '') && (*p <= '9')) {
1227 ret = ret * 10 + (*p - '');
1228 p++;
1229 }
1230 *ptr = p;
1231 return ret;
1232 }
1233
1234 static void
1235 mountopts(struct nfs_args *args, char *p)
1236 {
1237 args->version = NFS_ARGSVERSION;
1238 args->rsize = BOOTP_BLOCKSIZE;
1239 args->wsize = BOOTP_BLOCKSIZE;
1240 args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
1241 args->sotype = SOCK_DGRAM;
1242 if (p != NULL)
1243 nfs_parse_options(p, args);
1244 }
1245
1246 static int
1247 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
1248 {
1249 struct mbuf *m;
1250 int alignedlen;
1251
1252 m = *mptr;
1253 alignedlen = ( len + 3 ) & ~3;
1254
1255 if (m->m_len < alignedlen) {
1256 m = m_pullup(m, alignedlen);
1257 if (m == NULL) {
1258 *mptr = NULL;
1259 return EBADRPC;
1260 }
1261 }
1262 bcopy(mtod(m, u_char *), buf, len);
1263 m_adj(m, alignedlen);
1264 *mptr = m;
1265 return 0;
1266 }
1267
1268 static int
1269 xdr_int_decode(struct mbuf **mptr, int *iptr)
1270 {
1271 u_int32_t i;
1272
1273 if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
1274 return EBADRPC;
1275 *iptr = fxdr_unsigned(u_int32_t, i);
1276 return 0;
1277 }
1278
1279 static void
1280 print_sin_addr(struct sockaddr_in *sin)
1281 {
1282
1283 print_in_addr(sin->sin_addr);
1284 }
1285
1286 static void
1287 print_in_addr(struct in_addr addr)
1288 {
1289 unsigned int ip;
1290
1291 ip = ntohl(addr.s_addr);
1292 printf("%d.%d.%d.%d",
1293 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1294 }
1295
1296 static void
1297 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1298 struct bootpc_globalcontext *gctx, struct thread *td)
1299 {
1300 unsigned char *vendp;
1301 unsigned char vendor_client[64];
1302 uint32_t leasetime;
1303 uint8_t vendor_client_len;
1304
1305 ifctx->gotrootpath = 0;
1306
1307 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1308
1309 /* bootpc part */
1310 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */
1311 ifctx->call.htype = 1; /* 10mb ethernet */
1312 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1313 ifctx->call.hops = 0;
1314 if (bootpc_ifctx_isunresolved(ifctx) != 0)
1315 ifctx->xid++;
1316 ifctx->call.xid = txdr_unsigned(ifctx->xid);
1317 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1318
1319 vendp = ifctx->call.vend;
1320 *vendp++ = 99; /* RFC1048 cookie */
1321 *vendp++ = 130;
1322 *vendp++ = 83;
1323 *vendp++ = 99;
1324 *vendp++ = TAG_MAXMSGSIZE;
1325 *vendp++ = 2;
1326 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1327 *vendp++ = sizeof(struct bootp_packet) & 255;
1328
1329 snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1330 ostype, MACHINE, osrelease);
1331 vendor_client_len = strlen(vendor_client);
1332 *vendp++ = TAG_VENDOR_INDENTIFIER;
1333 *vendp++ = vendor_client_len;
1334 memcpy(vendp, vendor_client, vendor_client_len);
1335 vendp += vendor_client_len;
1336 ifctx->dhcpquerytype = DHCP_NOMSG;
1337 switch (ifctx->state) {
1338 case IF_DHCP_UNRESOLVED:
1339 *vendp++ = TAG_DHCP_MSGTYPE;
1340 *vendp++ = 1;
1341 *vendp++ = DHCP_DISCOVER;
1342 ifctx->dhcpquerytype = DHCP_DISCOVER;
1343 ifctx->gotdhcpserver = 0;
1344 break;
1345 case IF_DHCP_OFFERED:
1346 *vendp++ = TAG_DHCP_MSGTYPE;
1347 *vendp++ = 1;
1348 *vendp++ = DHCP_REQUEST;
1349 ifctx->dhcpquerytype = DHCP_REQUEST;
1350 *vendp++ = TAG_DHCP_REQ_ADDR;
1351 *vendp++ = 4;
1352 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1353 vendp += 4;
1354 if (ifctx->gotdhcpserver != 0) {
1355 *vendp++ = TAG_DHCP_SERVERID;
1356 *vendp++ = 4;
1357 memcpy(vendp, &ifctx->dhcpserver, 4);
1358 vendp += 4;
1359 }
1360 *vendp++ = TAG_DHCP_LEASETIME;
1361 *vendp++ = 4;
1362 leasetime = htonl(300);
1363 memcpy(vendp, &leasetime, 4);
1364 vendp += 4;
1365 break;
1366 default:
1367 break;
1368 }
1369 *vendp = TAG_END;
1370
1371 ifctx->call.secs = 0;
1372 ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */
1373 }
1374
1375 static int
1376 bootpc_hascookie(struct bootp_packet *bp)
1377 {
1378
1379 return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1380 bp->vend[2] == 83 && bp->vend[3] == 99);
1381 }
1382
1383 static void
1384 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1385 unsigned char *start, int len, int tag)
1386 {
1387 unsigned char *j;
1388 unsigned char *ej;
1389 unsigned char code;
1390
1391 if (tctx->badtag != 0 || tctx->badopt != 0)
1392 return;
1393
1394 j = start;
1395 ej = j + len;
1396
1397 while (j < ej) {
1398 code = *j++;
1399 if (code == TAG_PAD)
1400 continue;
1401 if (code == TAG_END)
1402 return;
1403 if (j >= ej || j + *j + 1 > ej) {
1404 tctx->badopt = 1;
1405 return;
1406 }
1407 len = *j++;
1408 if (code == tag) {
1409 if (tctx->taglen + len > TAG_MAXLEN) {
1410 tctx->badtag = 1;
1411 return;
1412 }
1413 tctx->foundopt = 1;
1414 if (len > 0)
1415 memcpy(tctx->buf + tctx->taglen,
1416 j, len);
1417 tctx->taglen += len;
1418 }
1419 if (code == TAG_OVERLOAD)
1420 tctx->overload = *j;
1421
1422 j += len;
1423 }
1424 }
1425
1426 static unsigned char *
1427 bootpc_tag(struct bootpc_tagcontext *tctx,
1428 struct bootp_packet *bp, int len, int tag)
1429 {
1430 tctx->overload = 0;
1431 tctx->badopt = 0;
1432 tctx->badtag = 0;
1433 tctx->foundopt = 0;
1434 tctx->taglen = 0;
1435
1436 if (bootpc_hascookie(bp) == 0)
1437 return NULL;
1438
1439 bootpc_tag_helper(tctx, &bp->vend[4],
1440 (unsigned char *) bp + len - &bp->vend[4], tag);
1441
1442 if ((tctx->overload & OVERLOAD_FILE) != 0)
1443 bootpc_tag_helper(tctx,
1444 (unsigned char *) bp->file,
1445 sizeof(bp->file),
1446 tag);
1447 if ((tctx->overload & OVERLOAD_SNAME) != 0)
1448 bootpc_tag_helper(tctx,
1449 (unsigned char *) bp->sname,
1450 sizeof(bp->sname),
1451 tag);
1452
1453 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1454 return NULL;
1455 tctx->buf[tctx->taglen] = '\0';
1456 return tctx->buf;
1457 }
1458
1459 static void
1460 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1461 struct bootpc_globalcontext *gctx)
1462 {
1463 char *p;
1464 unsigned int ip;
1465
1466 ifctx->gotgw = 0;
1467 ifctx->gotnetmask = 0;
1468
1469 clear_sinaddr(&ifctx->myaddr);
1470 clear_sinaddr(&ifctx->netmask);
1471 clear_sinaddr(&ifctx->gw);
1472
1473 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1474
1475 ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1476
1477 printf("%s at ", ifctx->ireq.ifr_name);
1478 print_sin_addr(&ifctx->myaddr);
1479 printf(" server ");
1480 print_in_addr(ifctx->reply.siaddr);
1481
1482 ifctx->gw.sin_addr = ifctx->reply.giaddr;
1483 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1484 printf(" via gateway ");
1485 print_in_addr(ifctx->reply.giaddr);
1486 }
1487
1488 /* This call used for the side effect (overload flag) */
1489 (void) bootpc_tag(&gctx->tmptag,
1490 &ifctx->reply, ifctx->replylen, TAG_END);
1491
1492 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1493 if (ifctx->reply.sname[0] != '\0')
1494 printf(" server name %s", ifctx->reply.sname);
1495 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1496 if (ifctx->reply.file[0] != '\0')
1497 printf(" boot file %s", ifctx->reply.file);
1498
1499 printf("\n");
1500
1501 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1502 TAG_SUBNETMASK);
1503 if (p != NULL) {
1504 if (gctx->tag.taglen != 4)
1505 panic("bootpc: subnet mask len is %d",
1506 gctx->tag.taglen);
1507 bcopy(p, &ifctx->netmask.sin_addr, 4);
1508 ifctx->gotnetmask = 1;
1509 printf("subnet mask ");
1510 print_sin_addr(&ifctx->netmask);
1511 printf(" ");
1512 }
1513
1514 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1515 TAG_ROUTERS);
1516 if (p != NULL) {
1517 /* Routers */
1518 if (gctx->tag.taglen % 4)
1519 panic("bootpc: Router Len is %d", gctx->tag.taglen);
1520 if (gctx->tag.taglen > 0) {
1521 bcopy(p, &ifctx->gw.sin_addr, 4);
1522 printf("router ");
1523 print_sin_addr(&ifctx->gw);
1524 printf(" ");
1525 ifctx->gotgw = 1;
1526 gctx->gotgw = 1;
1527 }
1528 }
1529
1530 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1531 TAG_ROOT);
1532 if (p != NULL) {
1533 if (gctx->setrootfs != NULL) {
1534 printf("rootfs %s (ignored) ", p);
1535 } else if (setfs(&nd->root_saddr,
1536 nd->root_hostnam, p, &ifctx->reply.siaddr)) {
1537 if (*p == '/') {
1538 printf("root_server ");
1539 print_sin_addr(&nd->root_saddr);
1540 printf(" ");
1541 }
1542 printf("rootfs %s ", p);
1543 gctx->gotrootpath = 1;
1544 ifctx->gotrootpath = 1;
1545 gctx->setrootfs = ifctx;
1546
1547 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1548 ifctx->replylen,
1549 TAG_ROOTOPTS);
1550 if (p != NULL) {
1551 mountopts(&nd->root_args, p);
1552 printf("rootopts %s ", p);
1553 }
1554 } else
1555 panic("Failed to set rootfs to %s", p);
1556 }
1557
1558 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1559 TAG_HOSTNAME);
1560 if (p != NULL) {
1561 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1562 panic("bootpc: hostname >= %d bytes",
1563 MAXHOSTNAMELEN);
1564 if (gctx->sethostname != NULL) {
1565 printf("hostname %s (ignored) ", p);
1566 } else {
1567 strcpy(nd->my_hostnam, p);
1568 mtx_lock(&prison0.pr_mtx);
1569 strcpy(prison0.pr_hostname, p);
1570 mtx_unlock(&prison0.pr_mtx);
1571 printf("hostname %s ", p);
1572 gctx->sethostname = ifctx;
1573 }
1574 }
1575 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1576 TAG_COOKIE);
1577 if (p != NULL) { /* store in a sysctl variable */
1578 int i, l = sizeof(bootp_cookie) - 1;
1579 for (i = 0; i < l && p[i] != '\0'; i++)
1580 bootp_cookie[i] = p[i];
1581 p[i] = '\0';
1582 }
1583
1584
1585 printf("\n");
1586
1587 if (ifctx->gotnetmask == 0) {
1588 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1589 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1590 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1591 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1592 else
1593 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1594 }
1595 if (ifctx->gotgw == 0) {
1596 /* Use proxyarp */
1597 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1598 }
1599 }
1600
1601 void
1602 bootpc_init(void)
1603 {
1604 struct bootpc_ifcontext *ifctx, *nctx; /* Interface BOOTP contexts */
1605 struct bootpc_globalcontext *gctx; /* Global BOOTP context */
1606 struct ifnet *ifp;
1607 int error;
1608 #ifndef BOOTP_WIRED_TO
1609 int ifcnt;
1610 #endif
1611 struct nfsv3_diskless *nd;
1612 struct thread *td;
1613
1614 nd = &nfsv3_diskless;
1615 td = curthread;
1616
1617 /*
1618 * If already filled in, don't touch it here
1619 */
1620 if (nfs_diskless_valid != 0)
1621 return;
1622
1623 gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1624 if (gctx == NULL)
1625 panic("Failed to allocate bootp global context structure");
1626
1627 gctx->xid = ~0xFFFF;
1628 gctx->starttime = time_second;
1629
1630 /*
1631 * Find a network interface.
1632 */
1633 #ifdef BOOTP_WIRED_TO
1634 printf("bootpc_init: wired to interface '%s'\n",
1635 __XSTRING(BOOTP_WIRED_TO));
1636 allocifctx(gctx);
1637 #else
1638 /*
1639 * Preallocate interface context storage, if another interface
1640 * attaches and wins the race, it won't be eligible for bootp.
1641 */
1642 IFNET_RLOCK();
1643 for (ifp = TAILQ_FIRST(&V_ifnet), ifcnt = 0;
1644 ifp != NULL;
1645 ifp = TAILQ_NEXT(ifp, if_link)) {
1646 if ((ifp->if_flags &
1647 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1648 IFF_BROADCAST)
1649 continue;
1650 ifcnt++;
1651 }
1652 IFNET_RUNLOCK();
1653 if (ifcnt == 0)
1654 panic("bootpc_init: no eligible interfaces");
1655 for (; ifcnt > 0; ifcnt--)
1656 allocifctx(gctx);
1657 #endif
1658
1659 IFNET_RLOCK();
1660 for (ifp = TAILQ_FIRST(&V_ifnet), ifctx = gctx->interfaces;
1661 ifp != NULL && ifctx != NULL;
1662 ifp = TAILQ_NEXT(ifp, if_link)) {
1663 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1664 sizeof(ifctx->ireq.ifr_name));
1665 #ifdef BOOTP_WIRED_TO
1666 if (strcmp(ifctx->ireq.ifr_name,
1667 __XSTRING(BOOTP_WIRED_TO)) != 0)
1668 continue;
1669 #else
1670 if ((ifp->if_flags &
1671 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1672 IFF_BROADCAST)
1673 continue;
1674 #endif
1675 ifctx->ifp = ifp;
1676 ifctx = ifctx->next;
1677 }
1678 IFNET_RUNLOCK();
1679
1680 if (gctx->interfaces == NULL || gctx->interfaces->ifp == NULL) {
1681 #ifdef BOOTP_WIRED_TO
1682 panic("bootpc_init: Could not find interface specified "
1683 "by BOOTP_WIRED_TO: "
1684 __XSTRING(BOOTP_WIRED_TO));
1685 #else
1686 panic("bootpc_init: no suitable interface");
1687 #endif
1688 }
1689
1690 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1691 bootpc_fakeup_interface(ifctx, gctx, td);
1692
1693 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1694 bootpc_compose_query(ifctx, gctx, td);
1695
1696 error = bootpc_call(gctx, td);
1697
1698 if (error != 0) {
1699 #ifdef BOOTP_NFSROOT
1700 panic("BOOTP call failed");
1701 #else
1702 printf("BOOTP call failed\n");
1703 #endif
1704 }
1705
1706 rootdevnames[0] = "nfs:";
1707 mountopts(&nd->root_args, NULL);
1708
1709 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1710 if (bootpc_ifctx_isresolved(ifctx) != 0)
1711 bootpc_decode_reply(nd, ifctx, gctx);
1712
1713 #ifdef BOOTP_NFSROOT
1714 if (gctx->gotrootpath == 0)
1715 panic("bootpc: No root path offered");
1716 #endif
1717
1718 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1719 bootpc_adjust_interface(ifctx, gctx, td);
1720
1721 soclose(ifctx->so);
1722 }
1723
1724 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1725 if (ifctx->gotrootpath != 0)
1726 break;
1727 if (ifctx == NULL) {
1728 for (ifctx = gctx->interfaces;
1729 ifctx != NULL;
1730 ifctx = ifctx->next)
1731 if (bootpc_ifctx_isresolved(ifctx) != 0)
1732 break;
1733 }
1734 if (ifctx == NULL)
1735 goto out;
1736
1737 if (gctx->gotrootpath != 0) {
1738
1739 setenv("boot.netif.name", ifctx->ifp->if_xname);
1740
1741 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1742 nd->root_fh, &nd->root_fhsize,
1743 &nd->root_args, td);
1744 if (error != 0)
1745 panic("nfs_boot: mountd root, error=%d", error);
1746
1747 nfs_diskless_valid = 3;
1748 }
1749
1750 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1751 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1752 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1753 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1754 ifctx->myaddr.sin_addr.s_addr |
1755 ~ ifctx->netmask.sin_addr.s_addr;
1756 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1757
1758 out:
1759 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1760 nctx = ifctx->next;
1761 free(ifctx, M_TEMP);
1762 }
1763 free(gctx, M_TEMP);
1764 }
1765
1766 /*
1767 * RPC: mountd/mount
1768 * Given a server pathname, get an NFS file handle.
1769 * Also, sets sin->sin_port to the NFS service port.
1770 */
1771 static int
1772 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep,
1773 struct nfs_args *args, struct thread *td)
1774 {
1775 struct mbuf *m;
1776 int error;
1777 int authunixok;
1778 int authcount;
1779 int authver;
1780
1781 #define RPCPROG_MNT 100005
1782 #define RPCMNT_VER1 1
1783 #define RPCMNT_VER3 3
1784 #define RPCMNT_MOUNT 1
1785 #define AUTH_SYS 1 /* unix style (uid, gids) */
1786 #define AUTH_UNIX AUTH_SYS
1787
1788 /* XXX honor v2/v3 flags in args->flags? */
1789 #ifdef BOOTP_NFSV3
1790 /* First try NFS v3 */
1791 /* Get port number for MOUNTD. */
1792 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1793 &mdsin->sin_port, td);
1794 if (error == 0) {
1795 m = xdr_string_encode(path, strlen(path));
1796
1797 /* Do RPC to mountd. */
1798 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1799 RPCMNT_MOUNT, &m, NULL, td);
1800 }
1801 if (error == 0) {
1802 args->flags |= NFSMNT_NFSV3;
1803 } else {
1804 #endif
1805 /* Fallback to NFS v2 */
1806
1807 /* Get port number for MOUNTD. */
1808 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1809 &mdsin->sin_port, td);
1810 if (error != 0)
1811 return error;
1812
1813 m = xdr_string_encode(path, strlen(path));
1814
1815 /* Do RPC to mountd. */
1816 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1817 RPCMNT_MOUNT, &m, NULL, td);
1818 if (error != 0)
1819 return error; /* message already freed */
1820
1821 #ifdef BOOTP_NFSV3
1822 }
1823 #endif
1824
1825 if (xdr_int_decode(&m, &error) != 0 || error != 0)
1826 goto bad;
1827
1828 if ((args->flags & NFSMNT_NFSV3) != 0) {
1829 if (xdr_int_decode(&m, fhsizep) != 0 ||
1830 *fhsizep > NFSX_V3FHMAX ||
1831 *fhsizep <= 0)
1832 goto bad;
1833 } else
1834 *fhsizep = NFSX_V2FH;
1835
1836 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
1837 goto bad;
1838
1839 if (args->flags & NFSMNT_NFSV3) {
1840 if (xdr_int_decode(&m, &authcount) != 0)
1841 goto bad;
1842 authunixok = 0;
1843 if (authcount < 0 || authcount > 100)
1844 goto bad;
1845 while (authcount > 0) {
1846 if (xdr_int_decode(&m, &authver) != 0)
1847 goto bad;
1848 if (authver == AUTH_UNIX)
1849 authunixok = 1;
1850 authcount--;
1851 }
1852 if (authunixok == 0)
1853 goto bad;
1854 }
1855
1856 /* Set port number for NFS use. */
1857 error = krpc_portmap(mdsin, NFS_PROG,
1858 (args->flags &
1859 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
1860 &mdsin->sin_port, td);
1861
1862 goto out;
1863
1864 bad:
1865 error = EBADRPC;
1866
1867 out:
1868 m_freem(m);
1869 return error;
1870 }
1871
1872 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);
Cache object: e64350ef0d8200d43b63d3e1ac6ac80a
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