1 /* $NetBSD: bootp_subr.c,v 1.1.1.1 2013/09/30 07:19:31 dholland Exp $ */
2 /*-
3 * Copyright (c) 1995 Gordon Ross, Adam Glass
4 * Copyright (c) 1992 Regents of the University of California.
5 * All rights reserved.
6 *
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Lawrence Berkeley Laboratory and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * based on:
40 * nfs/krpc_subr.c
41 * NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp
42 */
43
44 #include <sys/cdefs.h>
45 /* __FBSDID("FreeBSD: head/sys/nfs/bootp_subr.c 253847 2013-07-31 19:14:00Z ian "); */
46 __RCSID("$NetBSD: bootp_subr.c,v 1.1.1.1 2013/09/30 07:19:31 dholland Exp $");
47
48 #include "opt_bootp.h"
49 #include "opt_nfs.h"
50 #include "opt_rootdevname.h"
51
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/jail.h>
55 #include <sys/kernel.h>
56 #include <sys/sockio.h>
57 #include <sys/malloc.h>
58 #include <sys/mount.h>
59 #include <sys/mbuf.h>
60 #include <sys/proc.h>
61 #include <sys/reboot.h>
62 #include <sys/socket.h>
63 #include <sys/socketvar.h>
64 #include <sys/sysctl.h>
65 #include <sys/uio.h>
66
67 #include <net/if.h>
68 #include <net/route.h>
69
70 #include <netinet/in.h>
71 #include <netinet/in_var.h>
72 #include <net/if_types.h>
73 #include <net/if_dl.h>
74 #include <net/vnet.h>
75
76 #include <nfs/nfsproto.h>
77 #include <nfsclient/nfs.h>
78 #include <nfs/nfsdiskless.h>
79 #include <nfs/krpc.h>
80 #include <nfs/xdr_subs.h>
81
82
83 #define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */
84
85 #ifndef BOOTP_SETTLE_DELAY
86 #define BOOTP_SETTLE_DELAY 3
87 #endif
88
89 /*
90 * Wait 10 seconds for interface appearance
91 * USB ethernet adapters might require some time to pop up
92 */
93 #ifndef BOOTP_IFACE_WAIT_TIMEOUT
94 #define BOOTP_IFACE_WAIT_TIMEOUT 10
95 #endif
96
97 /*
98 * What is the longest we will wait before re-sending a request?
99 * Note this is also the frequency of "RPC timeout" messages.
100 * The re-send loop count sup linearly to this maximum, so the
101 * first complaint will happen after (1+2+3+4+5)=15 seconds.
102 */
103 #define MAX_RESEND_DELAY 5 /* seconds */
104
105 /* Definitions from RFC951 */
106 struct bootp_packet {
107 u_int8_t op;
108 u_int8_t htype;
109 u_int8_t hlen;
110 u_int8_t hops;
111 u_int32_t xid;
112 u_int16_t secs;
113 u_int16_t flags;
114 struct in_addr ciaddr;
115 struct in_addr yiaddr;
116 struct in_addr siaddr;
117 struct in_addr giaddr;
118 unsigned char chaddr[16];
119 char sname[64];
120 char file[128];
121 unsigned char vend[1222];
122 };
123
124 struct bootpc_ifcontext {
125 STAILQ_ENTRY(bootpc_ifcontext) next;
126 struct bootp_packet call;
127 struct bootp_packet reply;
128 int replylen;
129 int overload;
130 union {
131 struct ifreq _ifreq;
132 struct in_aliasreq _in_alias_req;
133 } _req;
134 #define ireq _req._ifreq
135 #define iareq _req._in_alias_req
136 struct ifnet *ifp;
137 struct sockaddr_dl *sdl;
138 struct sockaddr_in myaddr;
139 struct sockaddr_in netmask;
140 struct sockaddr_in gw;
141 int gotgw;
142 int gotnetmask;
143 int gotrootpath;
144 int outstanding;
145 int sentmsg;
146 u_int32_t xid;
147 enum {
148 IF_BOOTP_UNRESOLVED,
149 IF_BOOTP_RESOLVED,
150 IF_BOOTP_FAILED,
151 IF_DHCP_UNRESOLVED,
152 IF_DHCP_OFFERED,
153 IF_DHCP_RESOLVED,
154 IF_DHCP_FAILED,
155 } state;
156 int dhcpquerytype; /* dhcp type sent */
157 struct in_addr dhcpserver;
158 int gotdhcpserver;
159 };
160
161 #define TAG_MAXLEN 1024
162 struct bootpc_tagcontext {
163 char buf[TAG_MAXLEN + 1];
164 int overload;
165 int badopt;
166 int badtag;
167 int foundopt;
168 int taglen;
169 };
170
171 struct bootpc_globalcontext {
172 STAILQ_HEAD(, bootpc_ifcontext) interfaces;
173 u_int32_t xid;
174 int any_root_overrides;
175 int gotrootpath;
176 int gotgw;
177 int ifnum;
178 int secs;
179 int starttime;
180 struct bootp_packet reply;
181 int replylen;
182 struct bootpc_ifcontext *setrootfs;
183 struct bootpc_ifcontext *sethostname;
184 struct bootpc_tagcontext tmptag;
185 struct bootpc_tagcontext tag;
186 };
187
188 #define IPPORT_BOOTPC 68
189 #define IPPORT_BOOTPS 67
190
191 #define BOOTP_REQUEST 1
192 #define BOOTP_REPLY 2
193
194 /* Common tags */
195 #define TAG_PAD 0 /* Pad option, implicit length 1 */
196 #define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */
197 #define TAG_ROUTERS 3 /* Routers (in order of preference) */
198 #define TAG_HOSTNAME 12 /* Client host name */
199 #define TAG_ROOT 17 /* Root path */
200
201 /* DHCP specific tags */
202 #define TAG_OVERLOAD 52 /* Option Overload */
203 #define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */
204
205 #define TAG_END 255 /* End Option (i.e. no more options) */
206
207 /* Overload values */
208 #define OVERLOAD_FILE 1
209 #define OVERLOAD_SNAME 2
210
211 /* Site specific tags: */
212 #define TAG_ROOTOPTS 130
213 #define TAG_COOKIE 134 /* ascii info for userland, via sysctl */
214
215 #define TAG_DHCP_MSGTYPE 53
216 #define TAG_DHCP_REQ_ADDR 50
217 #define TAG_DHCP_SERVERID 54
218 #define TAG_DHCP_LEASETIME 51
219
220 #define TAG_VENDOR_INDENTIFIER 60
221
222 #define DHCP_NOMSG 0
223 #define DHCP_DISCOVER 1
224 #define DHCP_OFFER 2
225 #define DHCP_REQUEST 3
226 #define DHCP_ACK 5
227
228 /* NFS read/write block size */
229 #ifndef BOOTP_BLOCKSIZE
230 #define BOOTP_BLOCKSIZE 8192
231 #endif
232
233 static char bootp_cookie[128];
234 static struct socket *bootp_so;
235 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
236 bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
237
238 /* mountd RPC */
239 static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp,
240 int *fhsizep, struct nfs_args *args, struct thread *td);
241 static int setfs(struct sockaddr_in *addr, char *path, char *p,
242 const struct in_addr *siaddr);
243 static int getdec(char **ptr);
244 static int getip(char **ptr, struct in_addr *ip);
245 static void mountopts(struct nfs_args *args, char *p);
246 static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
247 static int xdr_int_decode(struct mbuf **ptr, int *iptr);
248 static void print_in_addr(struct in_addr addr);
249 static void print_sin_addr(struct sockaddr_in *addr);
250 static void clear_sinaddr(struct sockaddr_in *sin);
251 static void allocifctx(struct bootpc_globalcontext *gctx);
252 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
253 struct thread *td);
254 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
255 struct bootp_packet *bp, int len, int tag);
256 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
257 unsigned char *start, int len, int tag);
258
259 #ifdef BOOTP_DEBUG
260 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma);
261 void bootpboot_p_rtentry(struct rtentry *rt);
262 void bootpboot_p_tree(struct radix_node *rn);
263 void bootpboot_p_rtlist(void);
264 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
265 void bootpboot_p_iflist(void);
266 #endif
267
268 static int bootpc_call(struct bootpc_globalcontext *gctx,
269 struct thread *td);
270
271 static void bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
272 struct thread *td);
273
274 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
275 struct bootpc_globalcontext *gctx, struct thread *td);
276
277 static void bootpc_decode_reply(struct nfsv3_diskless *nd,
278 struct bootpc_ifcontext *ifctx,
279 struct bootpc_globalcontext *gctx);
280
281 static int bootpc_received(struct bootpc_globalcontext *gctx,
282 struct bootpc_ifcontext *ifctx);
283
284 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
285 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
286 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
287
288 /*
289 * In order to have multiple active interfaces with address 0.0.0.0
290 * and be able to send data to a selected interface, we first set
291 * mask to /8 on all interfaces, and temporarily set it to /0 when
292 * doing sosend().
293 */
294
295 #ifdef BOOTP_DEBUG
296 void
bootpboot_p_sa(struct sockaddr * sa,struct sockaddr * ma)297 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
298 {
299
300 if (sa == NULL) {
301 printf("(sockaddr *) <null>");
302 return;
303 }
304 switch (sa->sa_family) {
305 case AF_INET:
306 {
307 struct sockaddr_in *sin;
308
309 sin = (struct sockaddr_in *) sa;
310 printf("inet ");
311 print_sin_addr(sin);
312 if (ma != NULL) {
313 sin = (struct sockaddr_in *) ma;
314 printf(" mask ");
315 print_sin_addr(sin);
316 }
317 }
318 break;
319 case AF_LINK:
320 {
321 struct sockaddr_dl *sli;
322 int i;
323
324 sli = (struct sockaddr_dl *) sa;
325 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
326 for (i = 0; i < sli->sdl_alen; i++) {
327 if (i > 0)
328 printf(":");
329 printf("%x", ((unsigned char *) LLADDR(sli))[i]);
330 }
331 }
332 break;
333 default:
334 printf("af%d", sa->sa_family);
335 }
336 }
337
338 void
bootpboot_p_rtentry(struct rtentry * rt)339 bootpboot_p_rtentry(struct rtentry *rt)
340 {
341
342 bootpboot_p_sa(rt_key(rt), rt_mask(rt));
343 printf(" ");
344 bootpboot_p_sa(rt->rt_gateway, NULL);
345 printf(" ");
346 printf("flags %x", (unsigned short) rt->rt_flags);
347 printf(" %d", (int) rt->rt_rmx.rmx_expire);
348 printf(" %s\n", rt->rt_ifp->if_xname);
349 }
350
351 void
bootpboot_p_tree(struct radix_node * rn)352 bootpboot_p_tree(struct radix_node *rn)
353 {
354
355 while (rn != NULL) {
356 if (rn->rn_bit < 0) {
357 if ((rn->rn_flags & RNF_ROOT) != 0) {
358 } else {
359 bootpboot_p_rtentry((struct rtentry *) rn);
360 }
361 rn = rn->rn_dupedkey;
362 } else {
363 bootpboot_p_tree(rn->rn_left);
364 bootpboot_p_tree(rn->rn_right);
365 return;
366 }
367 }
368 }
369
370 void
bootpboot_p_rtlist(void)371 bootpboot_p_rtlist(void)
372 {
373 struct radix_node_head *rnh;
374
375 printf("Routing table:\n");
376 rnh = rt_tables_get_rnh(0, AF_INET);
377 if (rnh == NULL)
378 return;
379 RADIX_NODE_HEAD_RLOCK(rnh); /* could sleep XXX */
380 bootpboot_p_tree(rnh->rnh_treetop);
381 RADIX_NODE_HEAD_RUNLOCK(rnh);
382 }
383
384 void
bootpboot_p_if(struct ifnet * ifp,struct ifaddr * ifa)385 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
386 {
387
388 printf("%s flags %x, addr ",
389 ifp->if_xname, ifp->if_flags);
390 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
391 printf(", broadcast ");
392 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
393 printf(", netmask ");
394 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
395 printf("\n");
396 }
397
398 void
bootpboot_p_iflist(void)399 bootpboot_p_iflist(void)
400 {
401 struct ifnet *ifp;
402 struct ifaddr *ifa;
403
404 printf("Interface list:\n");
405 IFNET_RLOCK();
406 for (ifp = TAILQ_FIRST(&V_ifnet);
407 ifp != NULL;
408 ifp = TAILQ_NEXT(ifp, if_link)) {
409 for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
410 ifa != NULL;
411 ifa = TAILQ_NEXT(ifa, ifa_link))
412 if (ifa->ifa_addr->sa_family == AF_INET)
413 bootpboot_p_if(ifp, ifa);
414 }
415 IFNET_RUNLOCK();
416 }
417 #endif /* defined(BOOTP_DEBUG) */
418
419 static void
clear_sinaddr(struct sockaddr_in * sin)420 clear_sinaddr(struct sockaddr_in *sin)
421 {
422
423 bzero(sin, sizeof(*sin));
424 sin->sin_len = sizeof(*sin);
425 sin->sin_family = AF_INET;
426 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
427 sin->sin_port = 0;
428 }
429
430 static void
allocifctx(struct bootpc_globalcontext * gctx)431 allocifctx(struct bootpc_globalcontext *gctx)
432 {
433 struct bootpc_ifcontext *ifctx;
434
435 ifctx = malloc(sizeof(*ifctx), M_TEMP, M_WAITOK | M_ZERO);
436 ifctx->xid = gctx->xid;
437 #ifdef BOOTP_NO_DHCP
438 ifctx->state = IF_BOOTP_UNRESOLVED;
439 #else
440 ifctx->state = IF_DHCP_UNRESOLVED;
441 #endif
442 gctx->xid += 0x100;
443 STAILQ_INSERT_TAIL(&gctx->interfaces, ifctx, next);
444 }
445
446 static __inline int
bootpc_ifctx_isresolved(struct bootpc_ifcontext * ifctx)447 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
448 {
449
450 if (ifctx->state == IF_BOOTP_RESOLVED ||
451 ifctx->state == IF_DHCP_RESOLVED)
452 return 1;
453 return 0;
454 }
455
456 static __inline int
bootpc_ifctx_isunresolved(struct bootpc_ifcontext * ifctx)457 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
458 {
459
460 if (ifctx->state == IF_BOOTP_UNRESOLVED ||
461 ifctx->state == IF_DHCP_UNRESOLVED)
462 return 1;
463 return 0;
464 }
465
466 static __inline int
bootpc_ifctx_isfailed(struct bootpc_ifcontext * ifctx)467 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
468 {
469
470 if (ifctx->state == IF_BOOTP_FAILED ||
471 ifctx->state == IF_DHCP_FAILED)
472 return 1;
473 return 0;
474 }
475
476 static int
bootpc_received(struct bootpc_globalcontext * gctx,struct bootpc_ifcontext * ifctx)477 bootpc_received(struct bootpc_globalcontext *gctx,
478 struct bootpc_ifcontext *ifctx)
479 {
480 unsigned char dhcpreplytype;
481 char *p;
482
483 /*
484 * Need timeout for fallback to less
485 * desirable alternative.
486 */
487
488 /* This call used for the side effect (badopt flag) */
489 (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
490 gctx->replylen,
491 TAG_END);
492
493 /* If packet is invalid, ignore it */
494 if (gctx->tmptag.badopt != 0)
495 return 0;
496
497 p = bootpc_tag(&gctx->tmptag, &gctx->reply,
498 gctx->replylen, TAG_DHCP_MSGTYPE);
499 if (p != NULL)
500 dhcpreplytype = *p;
501 else
502 dhcpreplytype = DHCP_NOMSG;
503
504 switch (ifctx->dhcpquerytype) {
505 case DHCP_DISCOVER:
506 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */
507 #ifndef BOOTP_FORCE_DHCP
508 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */
509 #endif
510 )
511 return 0;
512 break;
513 case DHCP_REQUEST:
514 if (dhcpreplytype != DHCP_ACK)
515 return 0;
516 case DHCP_NOMSG:
517 break;
518 }
519
520 /* Ignore packet unless it gives us a root tag we didn't have */
521
522 if ((ifctx->state == IF_BOOTP_RESOLVED ||
523 (ifctx->dhcpquerytype == DHCP_DISCOVER &&
524 (ifctx->state == IF_DHCP_OFFERED ||
525 ifctx->state == IF_DHCP_RESOLVED))) &&
526 (bootpc_tag(&gctx->tmptag, &ifctx->reply,
527 ifctx->replylen,
528 TAG_ROOT) != NULL ||
529 bootpc_tag(&gctx->tmptag, &gctx->reply,
530 gctx->replylen,
531 TAG_ROOT) == NULL))
532 return 0;
533
534 bcopy(&gctx->reply, &ifctx->reply, gctx->replylen);
535 ifctx->replylen = gctx->replylen;
536
537 /* XXX: Only reset if 'perfect' response */
538 if (ifctx->state == IF_BOOTP_UNRESOLVED)
539 ifctx->state = IF_BOOTP_RESOLVED;
540 else if (ifctx->state == IF_DHCP_UNRESOLVED &&
541 ifctx->dhcpquerytype == DHCP_DISCOVER) {
542 if (dhcpreplytype == DHCP_OFFER)
543 ifctx->state = IF_DHCP_OFFERED;
544 else
545 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */
546 } else if (ifctx->state == IF_DHCP_OFFERED &&
547 ifctx->dhcpquerytype == DHCP_REQUEST)
548 ifctx->state = IF_DHCP_RESOLVED;
549
550
551 if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
552 ifctx->state != IF_BOOTP_RESOLVED) {
553 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
554 ifctx->replylen, TAG_DHCP_SERVERID);
555 if (p != NULL && gctx->tmptag.taglen == 4) {
556 memcpy(&ifctx->dhcpserver, p, 4);
557 ifctx->gotdhcpserver = 1;
558 } else
559 ifctx->gotdhcpserver = 0;
560 return 1;
561 }
562
563 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
564 ifctx->replylen,
565 TAG_ROOT) != NULL);
566 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
567 ifctx->replylen,
568 TAG_ROUTERS) != NULL);
569 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
570 ifctx->replylen,
571 TAG_SUBNETMASK) != NULL);
572 return 1;
573 }
574
575 static int
bootpc_call(struct bootpc_globalcontext * gctx,struct thread * td)576 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
577 {
578 struct sockaddr_in *sin, dst;
579 struct uio auio;
580 struct sockopt sopt;
581 struct iovec aio;
582 int error, on, rcvflg, timo, len;
583 time_t atimo;
584 time_t rtimo;
585 struct timeval tv;
586 struct bootpc_ifcontext *ifctx;
587 int outstanding;
588 int gotrootpath;
589 int retry;
590 const char *s;
591
592 tv.tv_sec = 1;
593 tv.tv_usec = 0;
594 bzero(&sopt, sizeof(sopt));
595 sopt.sopt_dir = SOPT_SET;
596 sopt.sopt_level = SOL_SOCKET;
597 sopt.sopt_name = SO_RCVTIMEO;
598 sopt.sopt_val = &tv;
599 sopt.sopt_valsize = sizeof tv;
600
601 error = sosetopt(bootp_so, &sopt);
602 if (error != 0)
603 goto out;
604
605 /*
606 * Enable broadcast.
607 */
608 on = 1;
609 sopt.sopt_name = SO_BROADCAST;
610 sopt.sopt_val = &on;
611 sopt.sopt_valsize = sizeof on;
612
613 error = sosetopt(bootp_so, &sopt);
614 if (error != 0)
615 goto out;
616
617 /*
618 * Disable routing.
619 */
620
621 on = 1;
622 sopt.sopt_name = SO_DONTROUTE;
623 sopt.sopt_val = &on;
624 sopt.sopt_valsize = sizeof on;
625
626 error = sosetopt(bootp_so, &sopt);
627 if (error != 0)
628 goto out;
629
630 /*
631 * Bind the local endpoint to a bootp client port.
632 */
633 sin = &dst;
634 clear_sinaddr(sin);
635 sin->sin_port = htons(IPPORT_BOOTPC);
636 error = sobind(bootp_so, (struct sockaddr *)sin, td);
637 if (error != 0) {
638 printf("bind failed\n");
639 goto out;
640 }
641
642 /*
643 * Setup socket address for the server.
644 */
645 sin = &dst;
646 clear_sinaddr(sin);
647 sin->sin_addr.s_addr = INADDR_BROADCAST;
648 sin->sin_port = htons(IPPORT_BOOTPS);
649
650 /*
651 * Send it, repeatedly, until a reply is received,
652 * but delay each re-send by an increasing amount.
653 * If the delay hits the maximum, start complaining.
654 */
655 timo = 0;
656 rtimo = 0;
657 for (;;) {
658
659 outstanding = 0;
660 gotrootpath = 0;
661
662 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
663 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
664 bootpc_tag(&gctx->tmptag, &ifctx->reply,
665 ifctx->replylen,
666 TAG_ROOT) != NULL)
667 gotrootpath = 1;
668 }
669
670 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
671 struct in_aliasreq *ifra = &ifctx->iareq;
672 sin = (struct sockaddr_in *)&ifra->ifra_mask;
673
674 ifctx->outstanding = 0;
675 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
676 gotrootpath != 0) {
677 continue;
678 }
679 if (bootpc_ifctx_isfailed(ifctx) != 0)
680 continue;
681
682 outstanding++;
683 ifctx->outstanding = 1;
684
685 /* Proceed to next step in DHCP negotiation */
686 if ((ifctx->state == IF_DHCP_OFFERED &&
687 ifctx->dhcpquerytype != DHCP_REQUEST) ||
688 (ifctx->state == IF_DHCP_UNRESOLVED &&
689 ifctx->dhcpquerytype != DHCP_DISCOVER) ||
690 (ifctx->state == IF_BOOTP_UNRESOLVED &&
691 ifctx->dhcpquerytype != DHCP_NOMSG)) {
692 ifctx->sentmsg = 0;
693 bootpc_compose_query(ifctx, td);
694 }
695
696 /* Send BOOTP request (or re-send). */
697
698 if (ifctx->sentmsg == 0) {
699 switch(ifctx->dhcpquerytype) {
700 case DHCP_DISCOVER:
701 s = "DHCP Discover";
702 break;
703 case DHCP_REQUEST:
704 s = "DHCP Request";
705 break;
706 case DHCP_NOMSG:
707 default:
708 s = "BOOTP Query";
709 break;
710 }
711 printf("Sending %s packet from "
712 "interface %s (%*D)\n",
713 s,
714 ifctx->ireq.ifr_name,
715 ifctx->sdl->sdl_alen,
716 (unsigned char *) LLADDR(ifctx->sdl),
717 ":");
718 ifctx->sentmsg = 1;
719 }
720
721 aio.iov_base = (caddr_t) &ifctx->call;
722 aio.iov_len = sizeof(ifctx->call);
723
724 auio.uio_iov = &aio;
725 auio.uio_iovcnt = 1;
726 auio.uio_segflg = UIO_SYSSPACE;
727 auio.uio_rw = UIO_WRITE;
728 auio.uio_offset = 0;
729 auio.uio_resid = sizeof(ifctx->call);
730 auio.uio_td = td;
731
732 /* Set netmask to 0.0.0.0 */
733 clear_sinaddr(sin);
734 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra,
735 td);
736 if (error != 0)
737 panic("%s: SIOCAIFADDR, error=%d", __func__,
738 error);
739
740 error = sosend(bootp_so, (struct sockaddr *) &dst,
741 &auio, NULL, NULL, 0, td);
742 if (error != 0)
743 printf("%s: sosend: %d state %08x\n", __func__,
744 error, (int )bootp_so->so_state);
745
746 /* Set netmask to 255.0.0.0 */
747 sin->sin_addr.s_addr = htonl(IN_CLASSA_NET);
748 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra,
749 td);
750 if (error != 0)
751 panic("%s: SIOCAIFADDR, error=%d", __func__,
752 error);
753 }
754
755 if (outstanding == 0 &&
756 (rtimo == 0 || time_second >= rtimo)) {
757 error = 0;
758 goto out;
759 }
760
761 /* Determine new timeout. */
762 if (timo < MAX_RESEND_DELAY)
763 timo++;
764 else {
765 printf("DHCP/BOOTP timeout for server ");
766 print_sin_addr(&dst);
767 printf("\n");
768 }
769
770 /*
771 * Wait for up to timo seconds for a reply.
772 * The socket receive timeout was set to 1 second.
773 */
774 atimo = timo + time_second;
775 while (time_second < atimo) {
776 aio.iov_base = (caddr_t) &gctx->reply;
777 aio.iov_len = sizeof(gctx->reply);
778
779 auio.uio_iov = &aio;
780 auio.uio_iovcnt = 1;
781 auio.uio_segflg = UIO_SYSSPACE;
782 auio.uio_rw = UIO_READ;
783 auio.uio_offset = 0;
784 auio.uio_resid = sizeof(gctx->reply);
785 auio.uio_td = td;
786
787 rcvflg = 0;
788 error = soreceive(bootp_so, NULL, &auio,
789 NULL, NULL, &rcvflg);
790 gctx->secs = time_second - gctx->starttime;
791 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
792 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
793 bootpc_ifctx_isfailed(ifctx) != 0)
794 continue;
795
796 ifctx->call.secs = htons(gctx->secs);
797 }
798 if (error == EWOULDBLOCK)
799 continue;
800 if (error != 0)
801 goto out;
802 len = sizeof(gctx->reply) - auio.uio_resid;
803
804 /* Do we have the required number of bytes ? */
805 if (len < BOOTP_MIN_LEN)
806 continue;
807 gctx->replylen = len;
808
809 /* Is it a reply? */
810 if (gctx->reply.op != BOOTP_REPLY)
811 continue;
812
813 /* Is this an answer to our query */
814 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) {
815 if (gctx->reply.xid != ifctx->call.xid)
816 continue;
817
818 /* Same HW address size ? */
819 if (gctx->reply.hlen != ifctx->call.hlen)
820 continue;
821
822 /* Correct HW address ? */
823 if (bcmp(gctx->reply.chaddr,
824 ifctx->call.chaddr,
825 ifctx->call.hlen) != 0)
826 continue;
827
828 break;
829 }
830
831 if (ifctx != NULL) {
832 s = bootpc_tag(&gctx->tmptag,
833 &gctx->reply,
834 gctx->replylen,
835 TAG_DHCP_MSGTYPE);
836 if (s != NULL) {
837 switch (*s) {
838 case DHCP_OFFER:
839 s = "DHCP Offer";
840 break;
841 case DHCP_ACK:
842 s = "DHCP Ack";
843 break;
844 default:
845 s = "DHCP (unexpected)";
846 break;
847 }
848 } else
849 s = "BOOTP Reply";
850
851 printf("Received %s packet"
852 " on %s from ",
853 s,
854 ifctx->ireq.ifr_name);
855 print_in_addr(gctx->reply.siaddr);
856 if (gctx->reply.giaddr.s_addr !=
857 htonl(INADDR_ANY)) {
858 printf(" via ");
859 print_in_addr(gctx->reply.giaddr);
860 }
861 if (bootpc_received(gctx, ifctx) != 0) {
862 printf(" (accepted)");
863 if (ifctx->outstanding) {
864 ifctx->outstanding = 0;
865 outstanding--;
866 }
867 /* Network settle delay */
868 if (outstanding == 0)
869 atimo = time_second +
870 BOOTP_SETTLE_DELAY;
871 } else
872 printf(" (ignored)");
873 if (ifctx->gotrootpath ||
874 gctx->any_root_overrides) {
875 gotrootpath = 1;
876 rtimo = time_second +
877 BOOTP_SETTLE_DELAY;
878 if (ifctx->gotrootpath)
879 printf(" (got root path)");
880 }
881 printf("\n");
882 }
883 } /* while secs */
884 #ifdef BOOTP_TIMEOUT
885 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
886 break;
887 #endif
888 /* Force a retry if halfway in DHCP negotiation */
889 retry = 0;
890 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
891 if (ifctx->state == IF_DHCP_OFFERED) {
892 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
893 retry = 1;
894 else
895 ifctx->state = IF_DHCP_UNRESOLVED;
896 }
897
898 if (retry != 0)
899 continue;
900
901 if (gotrootpath != 0) {
902 gctx->gotrootpath = gotrootpath;
903 if (rtimo != 0 && time_second >= rtimo)
904 break;
905 }
906 } /* forever send/receive */
907
908 /*
909 * XXX: These are errors of varying seriousness being silently
910 * ignored
911 */
912
913 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
914 if (bootpc_ifctx_isresolved(ifctx) == 0) {
915 printf("%s timeout for interface %s\n",
916 ifctx->dhcpquerytype != DHCP_NOMSG ?
917 "DHCP" : "BOOTP",
918 ifctx->ireq.ifr_name);
919 }
920
921 if (gctx->gotrootpath != 0) {
922 #if 0
923 printf("Got a root path, ignoring remaining timeout\n");
924 #endif
925 error = 0;
926 goto out;
927 }
928 #ifndef BOOTP_NFSROOT
929 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
930 if (bootpc_ifctx_isresolved(ifctx) != 0) {
931 error = 0;
932 goto out;
933 }
934 #endif
935 error = ETIMEDOUT;
936
937 out:
938 return (error);
939 }
940
941 static void
bootpc_fakeup_interface(struct bootpc_ifcontext * ifctx,struct thread * td)942 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, struct thread *td)
943 {
944 struct ifreq *ifr;
945 struct in_aliasreq *ifra;
946 struct sockaddr_in *sin;
947 int error;
948
949 ifr = &ifctx->ireq;
950 ifra = &ifctx->iareq;
951
952 /*
953 * Bring up the interface.
954 *
955 * Get the old interface flags and or IFF_UP into them; if
956 * IFF_UP set blindly, interface selection can be clobbered.
957 */
958 error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td);
959 if (error != 0)
960 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error);
961 ifr->ifr_flags |= IFF_UP;
962 error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td);
963 if (error != 0)
964 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error);
965
966 /*
967 * Do enough of ifconfig(8) so that the chosen interface
968 * can talk to the servers. Set address to 0.0.0.0/8 and
969 * broadcast address to local broadcast.
970 */
971 sin = (struct sockaddr_in *)&ifra->ifra_addr;
972 clear_sinaddr(sin);
973 sin = (struct sockaddr_in *)&ifra->ifra_mask;
974 clear_sinaddr(sin);
975 sin->sin_addr.s_addr = htonl(IN_CLASSA_NET);
976 sin = (struct sockaddr_in *)&ifra->ifra_broadaddr;
977 clear_sinaddr(sin);
978 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
979 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td);
980 if (error != 0)
981 panic("%s: SIOCAIFADDR, error=%d", __func__, error);
982 }
983
984 static void
bootpc_shutdown_interface(struct bootpc_ifcontext * ifctx,struct thread * td)985 bootpc_shutdown_interface(struct bootpc_ifcontext *ifctx, struct thread *td)
986 {
987 struct ifreq *ifr;
988 struct sockaddr_in *sin;
989 int error;
990
991 ifr = &ifctx->ireq;
992
993 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
994 error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td);
995 if (error != 0)
996 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error);
997 ifr->ifr_flags &= ~IFF_UP;
998 error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td);
999 if (error != 0)
1000 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error);
1001
1002 sin = (struct sockaddr_in *) &ifr->ifr_addr;
1003 clear_sinaddr(sin);
1004 error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td);
1005 if (error != 0)
1006 panic("%s: SIOCDIFADDR, error=%d", __func__, error);
1007 }
1008
1009 static int
bootpc_adjust_interface(struct bootpc_ifcontext * ifctx,struct bootpc_globalcontext * gctx,struct thread * td)1010 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1011 struct bootpc_globalcontext *gctx, struct thread *td)
1012 {
1013 int error;
1014 struct sockaddr_in defdst;
1015 struct sockaddr_in defmask;
1016 struct sockaddr_in *sin;
1017 struct ifreq *ifr;
1018 struct in_aliasreq *ifra;
1019 struct sockaddr_in *myaddr;
1020 struct sockaddr_in *netmask;
1021 struct sockaddr_in *gw;
1022
1023 ifr = &ifctx->ireq;
1024 ifra = &ifctx->iareq;
1025 myaddr = &ifctx->myaddr;
1026 netmask = &ifctx->netmask;
1027 gw = &ifctx->gw;
1028
1029 if (bootpc_ifctx_isresolved(ifctx) == 0) {
1030 /* Shutdown interfaces where BOOTP failed */
1031 bootpc_shutdown_interface(ifctx, td);
1032 return (0);
1033 }
1034
1035 printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1036 /*
1037 * Do enough of ifconfig(8) so that the chosen interface
1038 * can talk to the servers. (just set the address)
1039 */
1040 sin = (struct sockaddr_in *) &ifr->ifr_addr;
1041 clear_sinaddr(sin);
1042 error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td);
1043 if (error != 0)
1044 panic("%s: SIOCDIFADDR, error=%d", __func__, error);
1045
1046 bcopy(myaddr, &ifra->ifra_addr, sizeof(*myaddr));
1047 bcopy(netmask, &ifra->ifra_mask, sizeof(*netmask));
1048 clear_sinaddr(&ifra->ifra_broadaddr);
1049 ifra->ifra_broadaddr.sin_addr.s_addr = myaddr->sin_addr.s_addr |
1050 ~netmask->sin_addr.s_addr;
1051
1052 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td);
1053 if (error != 0)
1054 panic("%s: SIOCAIFADDR, error=%d", __func__, error);
1055
1056 /* Add new default route */
1057
1058 if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1059 clear_sinaddr(&defdst);
1060 clear_sinaddr(&defmask);
1061 /* XXX MRT just table 0 */
1062 error = rtrequest_fib(RTM_ADD,
1063 (struct sockaddr *) &defdst, (struct sockaddr *) gw,
1064 (struct sockaddr *) &defmask,
1065 (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, RT_DEFAULT_FIB);
1066 if (error != 0) {
1067 printf("%s: RTM_ADD, error=%d\n", __func__, error);
1068 return (error);
1069 }
1070 }
1071
1072 return (0);
1073 }
1074
1075 static int
setfs(struct sockaddr_in * addr,char * path,char * p,const struct in_addr * siaddr)1076 setfs(struct sockaddr_in *addr, char *path, char *p,
1077 const struct in_addr *siaddr)
1078 {
1079
1080 if (getip(&p, &addr->sin_addr) == 0) {
1081 if (siaddr != NULL && *p == '/')
1082 bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr));
1083 else
1084 return 0;
1085 } else {
1086 if (*p != ':')
1087 return 0;
1088 p++;
1089 }
1090
1091 addr->sin_len = sizeof(struct sockaddr_in);
1092 addr->sin_family = AF_INET;
1093
1094 strlcpy(path, p, MNAMELEN);
1095 return 1;
1096 }
1097
1098 static int
getip(char ** ptr,struct in_addr * addr)1099 getip(char **ptr, struct in_addr *addr)
1100 {
1101 char *p;
1102 unsigned int ip;
1103 int val;
1104
1105 p = *ptr;
1106 ip = 0;
1107 if (((val = getdec(&p)) < 0) || (val > 255))
1108 return 0;
1109 ip = val << 24;
1110 if (*p != '.')
1111 return 0;
1112 p++;
1113 if (((val = getdec(&p)) < 0) || (val > 255))
1114 return 0;
1115 ip |= (val << 16);
1116 if (*p != '.')
1117 return 0;
1118 p++;
1119 if (((val = getdec(&p)) < 0) || (val > 255))
1120 return 0;
1121 ip |= (val << 8);
1122 if (*p != '.')
1123 return 0;
1124 p++;
1125 if (((val = getdec(&p)) < 0) || (val > 255))
1126 return 0;
1127 ip |= val;
1128
1129 addr->s_addr = htonl(ip);
1130 *ptr = p;
1131 return 1;
1132 }
1133
1134 static int
getdec(char ** ptr)1135 getdec(char **ptr)
1136 {
1137 char *p;
1138 int ret;
1139
1140 p = *ptr;
1141 ret = 0;
1142 if ((*p < '0') || (*p > '9'))
1143 return -1;
1144 while ((*p >= '0') && (*p <= '9')) {
1145 ret = ret * 10 + (*p - '0');
1146 p++;
1147 }
1148 *ptr = p;
1149 return ret;
1150 }
1151
1152 static void
mountopts(struct nfs_args * args,char * p)1153 mountopts(struct nfs_args *args, char *p)
1154 {
1155 args->version = NFS_ARGSVERSION;
1156 args->rsize = BOOTP_BLOCKSIZE;
1157 args->wsize = BOOTP_BLOCKSIZE;
1158 args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
1159 args->sotype = SOCK_DGRAM;
1160 if (p != NULL)
1161 nfs_parse_options(p, args);
1162 }
1163
1164 static int
xdr_opaque_decode(struct mbuf ** mptr,u_char * buf,int len)1165 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
1166 {
1167 struct mbuf *m;
1168 int alignedlen;
1169
1170 m = *mptr;
1171 alignedlen = ( len + 3 ) & ~3;
1172
1173 if (m->m_len < alignedlen) {
1174 m = m_pullup(m, alignedlen);
1175 if (m == NULL) {
1176 *mptr = NULL;
1177 return EBADRPC;
1178 }
1179 }
1180 bcopy(mtod(m, u_char *), buf, len);
1181 m_adj(m, alignedlen);
1182 *mptr = m;
1183 return 0;
1184 }
1185
1186 static int
xdr_int_decode(struct mbuf ** mptr,int * iptr)1187 xdr_int_decode(struct mbuf **mptr, int *iptr)
1188 {
1189 u_int32_t i;
1190
1191 if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
1192 return EBADRPC;
1193 *iptr = fxdr_unsigned(u_int32_t, i);
1194 return 0;
1195 }
1196
1197 static void
print_sin_addr(struct sockaddr_in * sin)1198 print_sin_addr(struct sockaddr_in *sin)
1199 {
1200
1201 print_in_addr(sin->sin_addr);
1202 }
1203
1204 static void
print_in_addr(struct in_addr addr)1205 print_in_addr(struct in_addr addr)
1206 {
1207 unsigned int ip;
1208
1209 ip = ntohl(addr.s_addr);
1210 printf("%d.%d.%d.%d",
1211 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1212 }
1213
1214 static void
bootpc_compose_query(struct bootpc_ifcontext * ifctx,struct thread * td)1215 bootpc_compose_query(struct bootpc_ifcontext *ifctx, struct thread *td)
1216 {
1217 unsigned char *vendp;
1218 unsigned char vendor_client[64];
1219 uint32_t leasetime;
1220 uint8_t vendor_client_len;
1221
1222 ifctx->gotrootpath = 0;
1223
1224 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1225
1226 /* bootpc part */
1227 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */
1228 ifctx->call.htype = 1; /* 10mb ethernet */
1229 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1230 ifctx->call.hops = 0;
1231 if (bootpc_ifctx_isunresolved(ifctx) != 0)
1232 ifctx->xid++;
1233 ifctx->call.xid = txdr_unsigned(ifctx->xid);
1234 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1235
1236 vendp = ifctx->call.vend;
1237 *vendp++ = 99; /* RFC1048 cookie */
1238 *vendp++ = 130;
1239 *vendp++ = 83;
1240 *vendp++ = 99;
1241 *vendp++ = TAG_MAXMSGSIZE;
1242 *vendp++ = 2;
1243 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1244 *vendp++ = sizeof(struct bootp_packet) & 255;
1245
1246 snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1247 ostype, MACHINE, osrelease);
1248 vendor_client_len = strlen(vendor_client);
1249 *vendp++ = TAG_VENDOR_INDENTIFIER;
1250 *vendp++ = vendor_client_len;
1251 memcpy(vendp, vendor_client, vendor_client_len);
1252 vendp += vendor_client_len;
1253 ifctx->dhcpquerytype = DHCP_NOMSG;
1254 switch (ifctx->state) {
1255 case IF_DHCP_UNRESOLVED:
1256 *vendp++ = TAG_DHCP_MSGTYPE;
1257 *vendp++ = 1;
1258 *vendp++ = DHCP_DISCOVER;
1259 ifctx->dhcpquerytype = DHCP_DISCOVER;
1260 ifctx->gotdhcpserver = 0;
1261 break;
1262 case IF_DHCP_OFFERED:
1263 *vendp++ = TAG_DHCP_MSGTYPE;
1264 *vendp++ = 1;
1265 *vendp++ = DHCP_REQUEST;
1266 ifctx->dhcpquerytype = DHCP_REQUEST;
1267 *vendp++ = TAG_DHCP_REQ_ADDR;
1268 *vendp++ = 4;
1269 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1270 vendp += 4;
1271 if (ifctx->gotdhcpserver != 0) {
1272 *vendp++ = TAG_DHCP_SERVERID;
1273 *vendp++ = 4;
1274 memcpy(vendp, &ifctx->dhcpserver, 4);
1275 vendp += 4;
1276 }
1277 *vendp++ = TAG_DHCP_LEASETIME;
1278 *vendp++ = 4;
1279 leasetime = htonl(300);
1280 memcpy(vendp, &leasetime, 4);
1281 vendp += 4;
1282 break;
1283 default:
1284 break;
1285 }
1286 *vendp = TAG_END;
1287
1288 ifctx->call.secs = 0;
1289 ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */
1290 }
1291
1292 static int
bootpc_hascookie(struct bootp_packet * bp)1293 bootpc_hascookie(struct bootp_packet *bp)
1294 {
1295
1296 return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1297 bp->vend[2] == 83 && bp->vend[3] == 99);
1298 }
1299
1300 static void
bootpc_tag_helper(struct bootpc_tagcontext * tctx,unsigned char * start,int len,int tag)1301 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1302 unsigned char *start, int len, int tag)
1303 {
1304 unsigned char *j;
1305 unsigned char *ej;
1306 unsigned char code;
1307
1308 if (tctx->badtag != 0 || tctx->badopt != 0)
1309 return;
1310
1311 j = start;
1312 ej = j + len;
1313
1314 while (j < ej) {
1315 code = *j++;
1316 if (code == TAG_PAD)
1317 continue;
1318 if (code == TAG_END)
1319 return;
1320 if (j >= ej || j + *j + 1 > ej) {
1321 tctx->badopt = 1;
1322 return;
1323 }
1324 len = *j++;
1325 if (code == tag) {
1326 if (tctx->taglen + len > TAG_MAXLEN) {
1327 tctx->badtag = 1;
1328 return;
1329 }
1330 tctx->foundopt = 1;
1331 if (len > 0)
1332 memcpy(tctx->buf + tctx->taglen,
1333 j, len);
1334 tctx->taglen += len;
1335 }
1336 if (code == TAG_OVERLOAD)
1337 tctx->overload = *j;
1338
1339 j += len;
1340 }
1341 }
1342
1343 static unsigned char *
bootpc_tag(struct bootpc_tagcontext * tctx,struct bootp_packet * bp,int len,int tag)1344 bootpc_tag(struct bootpc_tagcontext *tctx,
1345 struct bootp_packet *bp, int len, int tag)
1346 {
1347 tctx->overload = 0;
1348 tctx->badopt = 0;
1349 tctx->badtag = 0;
1350 tctx->foundopt = 0;
1351 tctx->taglen = 0;
1352
1353 if (bootpc_hascookie(bp) == 0)
1354 return NULL;
1355
1356 bootpc_tag_helper(tctx, &bp->vend[4],
1357 (unsigned char *) bp + len - &bp->vend[4], tag);
1358
1359 if ((tctx->overload & OVERLOAD_FILE) != 0)
1360 bootpc_tag_helper(tctx,
1361 (unsigned char *) bp->file,
1362 sizeof(bp->file),
1363 tag);
1364 if ((tctx->overload & OVERLOAD_SNAME) != 0)
1365 bootpc_tag_helper(tctx,
1366 (unsigned char *) bp->sname,
1367 sizeof(bp->sname),
1368 tag);
1369
1370 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1371 return NULL;
1372 tctx->buf[tctx->taglen] = '\0';
1373 return tctx->buf;
1374 }
1375
1376 static void
bootpc_decode_reply(struct nfsv3_diskless * nd,struct bootpc_ifcontext * ifctx,struct bootpc_globalcontext * gctx)1377 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1378 struct bootpc_globalcontext *gctx)
1379 {
1380 char *p, *s;
1381 unsigned int ip;
1382
1383 ifctx->gotgw = 0;
1384 ifctx->gotnetmask = 0;
1385
1386 clear_sinaddr(&ifctx->myaddr);
1387 clear_sinaddr(&ifctx->netmask);
1388 clear_sinaddr(&ifctx->gw);
1389
1390 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1391
1392 ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1393
1394 printf("%s at ", ifctx->ireq.ifr_name);
1395 print_sin_addr(&ifctx->myaddr);
1396 printf(" server ");
1397 print_in_addr(ifctx->reply.siaddr);
1398
1399 ifctx->gw.sin_addr = ifctx->reply.giaddr;
1400 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1401 printf(" via gateway ");
1402 print_in_addr(ifctx->reply.giaddr);
1403 }
1404
1405 /* This call used for the side effect (overload flag) */
1406 (void) bootpc_tag(&gctx->tmptag,
1407 &ifctx->reply, ifctx->replylen, TAG_END);
1408
1409 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1410 if (ifctx->reply.sname[0] != '\0')
1411 printf(" server name %s", ifctx->reply.sname);
1412 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1413 if (ifctx->reply.file[0] != '\0')
1414 printf(" boot file %s", ifctx->reply.file);
1415
1416 printf("\n");
1417
1418 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1419 TAG_SUBNETMASK);
1420 if (p != NULL) {
1421 if (gctx->tag.taglen != 4)
1422 panic("bootpc: subnet mask len is %d",
1423 gctx->tag.taglen);
1424 bcopy(p, &ifctx->netmask.sin_addr, 4);
1425 ifctx->gotnetmask = 1;
1426 printf("subnet mask ");
1427 print_sin_addr(&ifctx->netmask);
1428 printf(" ");
1429 }
1430
1431 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1432 TAG_ROUTERS);
1433 if (p != NULL) {
1434 /* Routers */
1435 if (gctx->tag.taglen % 4)
1436 panic("bootpc: Router Len is %d", gctx->tag.taglen);
1437 if (gctx->tag.taglen > 0) {
1438 bcopy(p, &ifctx->gw.sin_addr, 4);
1439 printf("router ");
1440 print_sin_addr(&ifctx->gw);
1441 printf(" ");
1442 ifctx->gotgw = 1;
1443 gctx->gotgw = 1;
1444 }
1445 }
1446
1447 /*
1448 * Choose a root filesystem. If a value is forced in the environment
1449 * and it contains "nfs:", use it unconditionally. Otherwise, if the
1450 * kernel is compiled with the ROOTDEVNAME option, then use it if:
1451 * - The server doesn't provide a pathname.
1452 * - The boothowto flags include RB_DFLTROOT (user said to override
1453 * the server value).
1454 */
1455 p = NULL;
1456 if ((s = getenv("vfs.root.mountfrom")) != NULL) {
1457 if ((p = strstr(s, "nfs:")) != NULL)
1458 p = strdup(p + 4, M_TEMP);
1459 freeenv(s);
1460 }
1461 if (p == NULL) {
1462 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1463 TAG_ROOT);
1464 }
1465 #ifdef ROOTDEVNAME
1466 if ((p == NULL || (boothowto & RB_DFLTROOT) != 0) &&
1467 (p = strstr(ROOTDEVNAME, "nfs:")) != NULL) {
1468 p += 4;
1469 }
1470 #endif
1471 if (p != NULL) {
1472 if (gctx->setrootfs != NULL) {
1473 printf("rootfs %s (ignored) ", p);
1474 } else if (setfs(&nd->root_saddr,
1475 nd->root_hostnam, p, &ifctx->reply.siaddr)) {
1476 if (*p == '/') {
1477 printf("root_server ");
1478 print_sin_addr(&nd->root_saddr);
1479 printf(" ");
1480 }
1481 printf("rootfs %s ", p);
1482 gctx->gotrootpath = 1;
1483 ifctx->gotrootpath = 1;
1484 gctx->setrootfs = ifctx;
1485
1486 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1487 ifctx->replylen,
1488 TAG_ROOTOPTS);
1489 if (p != NULL) {
1490 mountopts(&nd->root_args, p);
1491 printf("rootopts %s ", p);
1492 }
1493 } else
1494 panic("Failed to set rootfs to %s", p);
1495 }
1496
1497 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1498 TAG_HOSTNAME);
1499 if (p != NULL) {
1500 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1501 panic("bootpc: hostname >= %d bytes",
1502 MAXHOSTNAMELEN);
1503 if (gctx->sethostname != NULL) {
1504 printf("hostname %s (ignored) ", p);
1505 } else {
1506 strcpy(nd->my_hostnam, p);
1507 mtx_lock(&prison0.pr_mtx);
1508 strcpy(prison0.pr_hostname, p);
1509 mtx_unlock(&prison0.pr_mtx);
1510 printf("hostname %s ", p);
1511 gctx->sethostname = ifctx;
1512 }
1513 }
1514 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1515 TAG_COOKIE);
1516 if (p != NULL) { /* store in a sysctl variable */
1517 int i, l = sizeof(bootp_cookie) - 1;
1518 for (i = 0; i < l && p[i] != '\0'; i++)
1519 bootp_cookie[i] = p[i];
1520 p[i] = '\0';
1521 }
1522
1523
1524 printf("\n");
1525
1526 if (ifctx->gotnetmask == 0) {
1527 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1528 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1529 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1530 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1531 else
1532 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1533 }
1534 if (ifctx->gotgw == 0) {
1535 /* Use proxyarp */
1536 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1537 }
1538 }
1539
1540 void
bootpc_init(void)1541 bootpc_init(void)
1542 {
1543 struct bootpc_ifcontext *ifctx; /* Interface BOOTP contexts */
1544 struct bootpc_globalcontext *gctx; /* Global BOOTP context */
1545 struct ifnet *ifp;
1546 struct sockaddr_dl *sdl;
1547 struct ifaddr *ifa;
1548 int error;
1549 #ifndef BOOTP_WIRED_TO
1550 int ifcnt;
1551 #endif
1552 struct nfsv3_diskless *nd;
1553 struct thread *td;
1554 int timeout;
1555 int delay;
1556
1557 timeout = BOOTP_IFACE_WAIT_TIMEOUT * hz;
1558 delay = hz / 10;
1559
1560 nd = &nfsv3_diskless;
1561 td = curthread;
1562
1563 /*
1564 * If already filled in, don't touch it here
1565 */
1566 if (nfs_diskless_valid != 0)
1567 return;
1568
1569 gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1570 STAILQ_INIT(&gctx->interfaces);
1571 gctx->xid = ~0xFFFF;
1572 gctx->starttime = time_second;
1573
1574 /*
1575 * If ROOTDEVNAME is defined or vfs.root.mountfrom is set then we have
1576 * root-path overrides that can potentially let us boot even if we don't
1577 * get a root path from the server, so we can treat that as a non-error.
1578 */
1579 #ifdef ROOTDEVNAME
1580 gctx->any_root_overrides = 1;
1581 #else
1582 gctx->any_root_overrides = testenv("vfs.root.mountfrom");
1583 #endif
1584
1585 /*
1586 * Find a network interface.
1587 */
1588 CURVNET_SET(TD_TO_VNET(td));
1589 #ifdef BOOTP_WIRED_TO
1590 printf("%s: wired to interface '%s'\n", __func__,
1591 __XSTRING(BOOTP_WIRED_TO));
1592 allocifctx(gctx);
1593 #else
1594 /*
1595 * Preallocate interface context storage, if another interface
1596 * attaches and wins the race, it won't be eligible for bootp.
1597 */
1598 ifcnt = 0;
1599 IFNET_RLOCK();
1600 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1601 if ((ifp->if_flags &
1602 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1603 IFF_BROADCAST)
1604 continue;
1605 switch (ifp->if_alloctype) {
1606 case IFT_ETHER:
1607 case IFT_FDDI:
1608 case IFT_ISO88025:
1609 break;
1610 default:
1611 continue;
1612 }
1613 ifcnt++;
1614 }
1615 IFNET_RUNLOCK();
1616 if (ifcnt == 0)
1617 panic("%s: no eligible interfaces", __func__);
1618 for (; ifcnt > 0; ifcnt--)
1619 allocifctx(gctx);
1620 #endif
1621
1622 retry:
1623 ifctx = STAILQ_FIRST(&gctx->interfaces);
1624 IFNET_RLOCK();
1625 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1626 if (ifctx == NULL)
1627 break;
1628 #ifdef BOOTP_WIRED_TO
1629 if (strcmp(ifp->if_xname, __XSTRING(BOOTP_WIRED_TO)) != 0)
1630 continue;
1631 #else
1632 if ((ifp->if_flags &
1633 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1634 IFF_BROADCAST)
1635 continue;
1636 switch (ifp->if_alloctype) {
1637 case IFT_ETHER:
1638 case IFT_FDDI:
1639 case IFT_ISO88025:
1640 break;
1641 default:
1642 continue;
1643 }
1644 #endif
1645 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1646 sizeof(ifctx->ireq.ifr_name));
1647 ifctx->ifp = ifp;
1648
1649 /* Get HW address */
1650 sdl = NULL;
1651 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1652 if (ifa->ifa_addr->sa_family == AF_LINK) {
1653 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1654 if (sdl->sdl_type == IFT_ETHER)
1655 break;
1656 }
1657 if (sdl == NULL)
1658 panic("bootpc: Unable to find HW address for %s",
1659 ifctx->ireq.ifr_name);
1660 ifctx->sdl = sdl;
1661
1662 ifctx = STAILQ_NEXT(ifctx, next);
1663 }
1664 IFNET_RUNLOCK();
1665 CURVNET_RESTORE();
1666
1667 if (STAILQ_EMPTY(&gctx->interfaces) ||
1668 STAILQ_FIRST(&gctx->interfaces)->ifp == NULL) {
1669 if (timeout > 0) {
1670 pause("bootpc", delay);
1671 timeout -= delay;
1672 goto retry;
1673 }
1674 #ifdef BOOTP_WIRED_TO
1675 panic("%s: Could not find interface specified "
1676 "by BOOTP_WIRED_TO: "
1677 __XSTRING(BOOTP_WIRED_TO), __func__);
1678 #else
1679 panic("%s: no suitable interface", __func__);
1680 #endif
1681 }
1682
1683 error = socreate(AF_INET, &bootp_so, SOCK_DGRAM, 0, td->td_ucred, td);
1684 if (error != 0)
1685 panic("%s: socreate, error=%d", __func__, error);
1686
1687 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1688 bootpc_fakeup_interface(ifctx, td);
1689
1690 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1691 bootpc_compose_query(ifctx, td);
1692
1693 error = bootpc_call(gctx, td);
1694 if (error != 0) {
1695 printf("BOOTP call failed\n");
1696 }
1697
1698 mountopts(&nd->root_args, NULL);
1699
1700 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1701 if (bootpc_ifctx_isresolved(ifctx) != 0)
1702 bootpc_decode_reply(nd, ifctx, gctx);
1703
1704 #ifdef BOOTP_NFSROOT
1705 if (gctx->gotrootpath == 0 && gctx->any_root_overrides == 0)
1706 panic("bootpc: No root path offered");
1707 #endif
1708
1709 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1710 bootpc_adjust_interface(ifctx, gctx, td);
1711
1712 soclose(bootp_so);
1713
1714 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1715 if (ifctx->gotrootpath != 0)
1716 break;
1717 if (ifctx == NULL) {
1718 STAILQ_FOREACH(ifctx, &gctx->interfaces, next)
1719 if (bootpc_ifctx_isresolved(ifctx) != 0)
1720 break;
1721 }
1722 if (ifctx == NULL)
1723 goto out;
1724
1725 if (gctx->gotrootpath != 0) {
1726
1727 setenv("boot.netif.name", ifctx->ifp->if_xname);
1728
1729 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1730 nd->root_fh, &nd->root_fhsize,
1731 &nd->root_args, td);
1732 if (error != 0) {
1733 if (gctx->any_root_overrides == 0)
1734 panic("nfs_boot: mount root, error=%d", error);
1735 else
1736 goto out;
1737 }
1738 rootdevnames[0] = "nfs:";
1739 #ifdef NFSCLIENT
1740 rootdevnames[1] = "oldnfs:";
1741 #endif
1742 nfs_diskless_valid = 3;
1743 }
1744
1745 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1746 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1747 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1748 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1749 ifctx->myaddr.sin_addr.s_addr |
1750 ~ ifctx->netmask.sin_addr.s_addr;
1751 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1752
1753 out:
1754 while((ifctx = STAILQ_FIRST(&gctx->interfaces)) != NULL) {
1755 STAILQ_REMOVE_HEAD(&gctx->interfaces, next);
1756 free(ifctx, M_TEMP);
1757 }
1758 free(gctx, M_TEMP);
1759 }
1760
1761 /*
1762 * RPC: mountd/mount
1763 * Given a server pathname, get an NFS file handle.
1764 * Also, sets sin->sin_port to the NFS service port.
1765 */
1766 static int
md_mount(struct sockaddr_in * mdsin,char * path,u_char * fhp,int * fhsizep,struct nfs_args * args,struct thread * td)1767 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep,
1768 struct nfs_args *args, struct thread *td)
1769 {
1770 struct mbuf *m;
1771 int error;
1772 int authunixok;
1773 int authcount;
1774 int authver;
1775
1776 #define RPCPROG_MNT 100005
1777 #define RPCMNT_VER1 1
1778 #define RPCMNT_VER3 3
1779 #define RPCMNT_MOUNT 1
1780 #define AUTH_SYS 1 /* unix style (uid, gids) */
1781 #define AUTH_UNIX AUTH_SYS
1782
1783 /* XXX honor v2/v3 flags in args->flags? */
1784 #ifdef BOOTP_NFSV3
1785 /* First try NFS v3 */
1786 /* Get port number for MOUNTD. */
1787 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1788 &mdsin->sin_port, td);
1789 if (error == 0) {
1790 m = xdr_string_encode(path, strlen(path));
1791
1792 /* Do RPC to mountd. */
1793 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1794 RPCMNT_MOUNT, &m, NULL, td);
1795 }
1796 if (error == 0) {
1797 args->flags |= NFSMNT_NFSV3;
1798 } else {
1799 #endif
1800 /* Fallback to NFS v2 */
1801
1802 /* Get port number for MOUNTD. */
1803 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1804 &mdsin->sin_port, td);
1805 if (error != 0)
1806 return error;
1807
1808 m = xdr_string_encode(path, strlen(path));
1809
1810 /* Do RPC to mountd. */
1811 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1812 RPCMNT_MOUNT, &m, NULL, td);
1813 if (error != 0)
1814 return error; /* message already freed */
1815
1816 #ifdef BOOTP_NFSV3
1817 }
1818 #endif
1819
1820 if (xdr_int_decode(&m, &error) != 0 || error != 0)
1821 goto bad;
1822
1823 if ((args->flags & NFSMNT_NFSV3) != 0) {
1824 if (xdr_int_decode(&m, fhsizep) != 0 ||
1825 *fhsizep > NFSX_V3FHMAX ||
1826 *fhsizep <= 0)
1827 goto bad;
1828 } else
1829 *fhsizep = NFSX_V2FH;
1830
1831 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
1832 goto bad;
1833
1834 if (args->flags & NFSMNT_NFSV3) {
1835 if (xdr_int_decode(&m, &authcount) != 0)
1836 goto bad;
1837 authunixok = 0;
1838 if (authcount < 0 || authcount > 100)
1839 goto bad;
1840 while (authcount > 0) {
1841 if (xdr_int_decode(&m, &authver) != 0)
1842 goto bad;
1843 if (authver == AUTH_UNIX)
1844 authunixok = 1;
1845 authcount--;
1846 }
1847 if (authunixok == 0)
1848 goto bad;
1849 }
1850
1851 /* Set port number for NFS use. */
1852 error = krpc_portmap(mdsin, NFS_PROG,
1853 (args->flags &
1854 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
1855 &mdsin->sin_port, td);
1856
1857 goto out;
1858
1859 bad:
1860 error = EBADRPC;
1861
1862 out:
1863 m_freem(m);
1864 return error;
1865 }
1866
1867 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);
1868