NFS - Fix numerous issues with NFS root mounts, primarily for vkernels
[dragonfly.git] / sys / vfs / nfs / bootp_subr.c
1 /*
2  * Copyright (c) 1995 Gordon Ross, Adam Glass
3  * Copyright (c) 1992 Regents of the University of California.
4  * All rights reserved.
5  *
6  * This software was developed by the Computer Systems Engineering group
7  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
8  * contributed to Berkeley.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *      This product includes software developed by the University of
21  *      California, Lawrence Berkeley Laboratory and its contributors.
22  * 4. Neither the name of the University nor the names of its contributors
23  *    may be used to endorse or promote products derived from this software
24  *    without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36  * SUCH DAMAGE.
37  *
38  * nfs/krpc_subr.c
39  * $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
40  * $FreeBSD: src/sys/nfs/bootp_subr.c,v 1.20.2.9 2003/04/24 16:51:08 ambrisko Exp $
41  * $DragonFly: src/sys/vfs/nfs/bootp_subr.c,v 1.26 2008/03/08 07:50:49 sephe Exp $
42  */
43
44 #include "opt_bootp.h"
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/sockio.h>
50 #include <sys/proc.h>
51 #include <sys/malloc.h>
52 #include <sys/mount.h>
53 #include <sys/mbuf.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56 #include <sys/sysctl.h>
57 #include <sys/uio.h>
58 #include <sys/fcntl.h>
59
60 #include <net/if.h>
61 #include <net/route.h>
62
63 #include <netinet/in.h>
64 #include <net/if_types.h>
65 #include <net/if_dl.h>
66
67 #include "rpcv2.h"
68 #include "nfsproto.h"
69 #include "nfs.h"
70 #include "nfsdiskless.h"
71 #include "krpc.h"
72 #include "xdr_subs.h"
73 #include "nfsmountrpc.h"
74
75 #define BOOTP_MIN_LEN           300     /* Minimum size of bootp udp packet */
76
77 #ifndef BOOTP_SETTLE_DELAY
78 #define BOOTP_SETTLE_DELAY 3
79 #endif
80
81 /*
82  * What is the longest we will wait before re-sending a request?
83  * Note this is also the frequency of "RPC timeout" messages.
84  * The re-send loop count sup linearly to this maximum, so the
85  * first complaint will happen after (1+2+3+4+5)=15 seconds.
86  */
87 #define MAX_RESEND_DELAY 5      /* seconds */
88
89 /* Definitions from RFC951 */
90 struct bootp_packet {
91         u_int8_t op;
92         u_int8_t htype;
93         u_int8_t hlen;
94         u_int8_t hops;
95         u_int32_t xid;
96         u_int16_t secs;
97         u_int16_t flags;
98         struct in_addr ciaddr;
99         struct in_addr yiaddr;
100         struct in_addr siaddr;
101         struct in_addr giaddr;
102         unsigned char chaddr[16];
103         char sname[64];
104         char file[128];
105         unsigned char vend[1222];
106 };
107
108 struct bootpc_ifcontext {
109         struct bootpc_ifcontext *next;
110         struct bootp_packet call;
111         struct bootp_packet reply;
112         int replylen;
113         int overload;
114         struct socket *so;
115         struct ifreq ireq;
116         struct ifnet *ifp;
117         struct sockaddr_dl *sdl;
118         struct sockaddr_in myaddr;
119         struct sockaddr_in netmask;
120         struct sockaddr_in gw;
121         struct sockaddr_in broadcast;   /* Different for each interface */
122         int gotgw;
123         int gotnetmask;
124         int gotrootpath;
125         int outstanding;
126         int sentmsg;
127         u_int32_t xid;
128         enum {
129                 IF_BOOTP_UNRESOLVED,
130                 IF_BOOTP_RESOLVED,
131                 IF_BOOTP_FAILED,
132                 IF_DHCP_UNRESOLVED,
133                 IF_DHCP_OFFERED,
134                 IF_DHCP_RESOLVED,
135                 IF_DHCP_FAILED,
136         } state;
137         int dhcpquerytype;              /* dhcp type sent */
138         struct in_addr dhcpserver;
139         int gotdhcpserver;
140 };
141
142 #define TAG_MAXLEN 1024
143 struct bootpc_tagcontext {
144         char buf[TAG_MAXLEN + 1];
145         int overload;
146         int badopt;
147         int badtag;
148         int foundopt;
149         int taglen;
150 };
151
152 struct bootpc_globalcontext {
153         struct bootpc_ifcontext *interfaces;
154         struct bootpc_ifcontext *lastinterface;
155         u_int32_t xid;
156         int gotrootpath;
157         int gotswappath;
158         int gotgw;
159         int ifnum;
160         int secs;
161         int starttime;
162         struct bootp_packet reply;
163         int replylen;
164         struct bootpc_ifcontext *setswapfs;
165         struct bootpc_ifcontext *setrootfs;
166         struct bootpc_ifcontext *sethostname;
167         char lookup_path[24];
168         struct bootpc_tagcontext tmptag;
169         struct bootpc_tagcontext tag;
170 };
171
172 #define IPPORT_BOOTPC 68
173 #define IPPORT_BOOTPS 67
174
175 #define BOOTP_REQUEST 1
176 #define BOOTP_REPLY 2
177
178 /* Common tags */
179 #define TAG_PAD           0  /* Pad option, implicit length 1 */
180 #define TAG_SUBNETMASK    1  /* RFC 950 subnet mask */
181 #define TAG_ROUTERS       3  /* Routers (in order of preference) */
182 #define TAG_HOSTNAME     12  /* Client host name */
183 #define TAG_ROOT         17  /* Root path */
184
185 /* DHCP specific tags */
186 #define TAG_OVERLOAD     52  /* Option Overload */
187 #define TAG_MAXMSGSIZE   57  /* Maximum DHCP Message Size */
188
189 #define TAG_END         255  /* End Option (i.e. no more options) */
190
191 /* Overload values */
192 #define OVERLOAD_FILE     1
193 #define OVERLOAD_SNAME    2
194
195 /* Site specific tags: */
196 #define TAG_SWAP        128
197 #define TAG_SWAPSIZE    129
198 #define TAG_ROOTOPTS    130
199 #define TAG_SWAPOPTS    131
200 #define TAG_COOKIE      134     /* ascii info for userland, exported via sysctl */
201
202 #define TAG_DHCP_MSGTYPE 53
203 #define TAG_DHCP_REQ_ADDR 50
204 #define TAG_DHCP_SERVERID 54
205 #define TAG_DHCP_LEASETIME 51
206
207 #define TAG_VENDOR_INDENTIFIER 60
208
209 #define DHCP_NOMSG    0
210 #define DHCP_DISCOVER 1
211 #define DHCP_OFFER    2
212 #define DHCP_REQUEST  3
213 #define DHCP_ACK      5
214
215 static char bootp_cookie[128];
216 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
217         bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
218
219 /* mountd RPC */
220 static void print_in_addr(struct in_addr addr);
221 static void print_sin_addr(struct sockaddr_in *addr);
222 static void clear_sinaddr(struct sockaddr_in *sin);
223 static
224 struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
225 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
226                                  struct bootpc_globalcontext *gctx,
227                                  struct thread *td);
228 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
229                                  struct bootp_packet *bp, int len, int tag);
230 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
231                               unsigned char *start, int len, int tag);
232
233 #ifdef BOOTP_DEBUG
234 void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
235 void bootpboot_p_ma(struct sockaddr *ma);
236 void bootpboot_p_rtentry(struct rtentry *rt);
237 void bootpboot_p_tree(struct radix_node *rn);
238 void bootpboot_p_rtlist(void);
239 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
240 void bootpboot_p_iflist(void);
241 #endif
242
243 static int  bootpc_call(struct bootpc_globalcontext *gctx,
244                         struct thread *td);
245
246 static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
247                                    struct bootpc_globalcontext *gctx,
248                                    struct thread *td);
249
250 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
251                                    struct bootpc_globalcontext *gctx,
252                                    struct thread *td);
253
254 static void bootpc_decode_reply(struct nfsv3_diskless *nd,
255                                 struct bootpc_ifcontext *ifctx,
256                                 struct bootpc_globalcontext *gctx);
257
258 static int bootpc_received(struct bootpc_globalcontext *gctx,
259                            struct bootpc_ifcontext *ifctx);
260
261 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
262 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
263 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
264
265 void bootpc_init(void);
266
267 /*
268  * In order to have multiple active interfaces with address 0.0.0.0
269  * and be able to send data to a selected interface, we perform
270  * some tricks:
271  * 
272  *  - The 'broadcast' address is different for each interface.
273  *
274  *  - We temporarily add routing pointing 255.255.255.255 to the
275  *    selected interface broadcast address, thus the packet sent
276  *    goes to that interface.
277  */
278
279 #ifdef BOOTP_DEBUG
280 void
281 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
282 {
283         if (sa == NULL) {
284                 kprintf("(sockaddr *) <null>");
285                 return;
286         }
287         switch (sa->sa_family) {
288         case AF_INET:
289         {
290                 struct sockaddr_in *sin;
291                 
292                 sin = (struct sockaddr_in *) sa;
293                 kprintf("inet ");
294                 print_sin_addr(sin);
295                 if (ma != NULL) {
296                         sin = (struct sockaddr_in *) ma;
297                         kprintf(" mask ");
298                         print_sin_addr(sin);
299                 }
300         }
301         break;
302         case AF_LINK:
303         {
304                 struct sockaddr_dl *sli;
305                 int i;
306                 
307                 sli = (struct sockaddr_dl *) sa;
308                 kprintf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
309                 for (i = 0; i < sli->sdl_alen; i++) {
310                         if (i > 0)
311                                 kprintf(":");
312                         kprintf("%x", ((unsigned char *) LLADDR(sli))[i]);
313                 }
314         }
315         break;
316         default:
317                 kprintf("af%d", sa->sa_family);
318         }
319 }
320
321
322 void
323 bootpboot_p_ma(struct sockaddr *ma)
324 {
325         if (ma == NULL) {
326                 kprintf("<null>");
327                 return;
328         }
329         kprintf("%x", *(int *)ma);
330 }
331
332
333 void
334 bootpboot_p_rtentry(struct rtentry *rt)
335 {
336         bootpboot_p_sa(rt_key(rt), rt_mask(rt));
337         kprintf(" ");
338         bootpboot_p_ma(rt->rt_genmask);
339         kprintf(" ");
340         bootpboot_p_sa(rt->rt_gateway, NULL);
341         kprintf(" ");
342         kprintf("flags %x", (unsigned short) rt->rt_flags);
343         kprintf(" %d", (int) rt->rt_rmx.rmx_expire);
344         kprintf(" %s\n", if_name(rt->rt_ifp));
345 }
346
347
348 void
349 bootpboot_p_tree(struct radix_node *rn)
350 {
351         while (rn != NULL) {
352                 if (rn->rn_bit < 0) {
353                         if ((rn->rn_flags & RNF_ROOT) != 0) {
354                         } else {
355                                 bootpboot_p_rtentry((struct rtentry *) rn);
356                         }
357                         rn = rn->rn_dupedkey;
358                 } else {
359                         bootpboot_p_tree(rn->rn_left);
360                         bootpboot_p_tree(rn->rn_right);
361                         return;
362                 }
363         }
364 }
365
366
367 void
368 bootpboot_p_rtlist(void)
369 {
370         kprintf("Routing table:\n");
371         bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
372 }
373
374
375 void
376 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
377 {
378         kprintf("%s flags %x, addr ",
379                if_name(ifp),
380                (unsigned short) ifp->if_flags);
381         print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
382         kprintf(", broadcast ");
383         print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
384         kprintf(", netmask ");
385         print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
386         kprintf("\n");
387 }
388
389
390 void
391 bootpboot_p_iflist(void)
392 {
393         struct ifnet *ifp;
394         struct ifaddr_container *ifac;
395         
396         kprintf("Interface list:\n");
397         TAILQ_FOREACH(ifp, &ifnet, if_link) {
398                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
399                         struct ifaddr *ifa = ifac->ifa;
400
401                         if (ifa->ifa_addr->sa_family == AF_INET)
402                                 bootpboot_p_if(ifp, ifa);
403                 }
404         }
405 }
406 #endif /* defined(BOOTP_DEBUG) */
407
408
409 static void
410 clear_sinaddr(struct sockaddr_in *sin)
411 {
412         bzero(sin, sizeof(*sin));
413         sin->sin_len = sizeof(*sin);
414         sin->sin_family = AF_INET;
415         sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
416         sin->sin_port = 0;
417 }
418
419
420 static struct bootpc_ifcontext *
421 allocifctx(struct bootpc_globalcontext *gctx)
422 {
423         struct bootpc_ifcontext *ifctx;
424         ifctx = (struct bootpc_ifcontext *) kmalloc(sizeof(*ifctx),
425                                                    M_TEMP, M_WAITOK);
426         bzero(ifctx, sizeof(*ifctx));
427         ifctx->xid = gctx->xid;
428 #ifdef BOOTP_NO_DHCP
429         ifctx->state = IF_BOOTP_UNRESOLVED;
430 #else
431         ifctx->state = IF_DHCP_UNRESOLVED;
432 #endif
433         gctx->xid += 0x100;
434         return ifctx;
435 }
436
437
438 static __inline int
439 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
440 {
441         if (ifctx->state == IF_BOOTP_RESOLVED ||
442             ifctx->state == IF_DHCP_RESOLVED)
443                 return 1;
444         return 0;
445 }
446
447
448 static __inline int
449 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
450 {
451         if (ifctx->state == IF_BOOTP_UNRESOLVED ||
452             ifctx->state == IF_DHCP_UNRESOLVED)
453                 return 1;
454         return 0;
455 }
456
457
458 static __inline int
459 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
460 {
461         if (ifctx->state == IF_BOOTP_FAILED ||
462             ifctx->state == IF_DHCP_FAILED)
463                 return 1;
464         return 0;
465 }
466
467
468 static int
469 bootpc_received(struct bootpc_globalcontext *gctx,
470                 struct bootpc_ifcontext *ifctx)
471 {
472         unsigned char dhcpreplytype;
473         char *p;
474         /*
475          * Need timeout for fallback to less
476          * desirable alternative.
477          */
478
479
480         /* This call used for the side effect (badopt flag) */
481         (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
482                           gctx->replylen,
483                           TAG_END);
484
485         /* If packet is invalid, ignore it */
486         if (gctx->tmptag.badopt != 0)
487                 return 0;
488         
489         p = bootpc_tag(&gctx->tmptag, &gctx->reply,
490                        gctx->replylen, TAG_DHCP_MSGTYPE);
491         if (p != NULL)
492                 dhcpreplytype = *p;
493         else
494                 dhcpreplytype = DHCP_NOMSG;
495         
496         switch (ifctx->dhcpquerytype) {
497         case DHCP_DISCOVER:
498                 if (dhcpreplytype != DHCP_OFFER         /* Normal DHCP offer */
499 #ifndef BOOTP_FORCE_DHCP
500                     && dhcpreplytype != DHCP_NOMSG      /* Fallback to BOOTP */
501 #endif
502                         )
503                         return 0;
504                 break;
505         case DHCP_REQUEST:
506                 if (dhcpreplytype != DHCP_ACK)
507                         return 0;
508                 /* fall through */
509         case DHCP_NOMSG:
510                 break;
511         }
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,
529               &ifctx->reply,
530               gctx->replylen);
531         ifctx->replylen = gctx->replylen;
532         
533         /* XXX: Only reset if 'perfect' response */
534         if (ifctx->state == IF_BOOTP_UNRESOLVED)
535                 ifctx->state = IF_BOOTP_RESOLVED;
536         else if (ifctx->state == IF_DHCP_UNRESOLVED &&
537                  ifctx->dhcpquerytype == DHCP_DISCOVER) {
538                 if (dhcpreplytype == DHCP_OFFER)
539                         ifctx->state = IF_DHCP_OFFERED;
540                 else
541                         ifctx->state = IF_BOOTP_RESOLVED;       /* Fallback */
542         } else if (ifctx->state == IF_DHCP_OFFERED &&
543                    ifctx->dhcpquerytype == DHCP_REQUEST)
544                 ifctx->state = IF_DHCP_RESOLVED;
545         
546         
547         if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
548             ifctx->state != IF_BOOTP_RESOLVED) {
549                 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
550                                ifctx->replylen, TAG_DHCP_SERVERID);
551                 if (p != NULL && gctx->tmptag.taglen == 4) {
552                         memcpy(&ifctx->dhcpserver, p, 4);
553                         ifctx->gotdhcpserver = 1;
554                 } else
555                         ifctx->gotdhcpserver = 0;
556                 return 1;
557         }
558         
559         ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
560                                          ifctx->replylen,
561                                          TAG_ROOT) != NULL);
562         ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
563                                    ifctx->replylen,
564                                    TAG_ROUTERS) != NULL);
565         ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
566                                         ifctx->replylen,
567                                         TAG_SUBNETMASK) != NULL);
568         return 1;
569 }
570
571 static int
572 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
573 {
574         struct socket *so;
575         struct sockaddr_in *sin, dst;
576         struct uio auio;
577         struct sockopt sopt;
578         struct iovec aio;
579         int error, on, rcvflg, timo, len;
580         time_t atimo;
581         time_t rtimo;
582         struct timeval tv;
583         struct bootpc_ifcontext *ifctx;
584         int outstanding;
585         int gotrootpath;
586         int retry;
587         const char *s;
588         
589         /*
590          * Create socket and set its recieve timeout.
591          */
592         error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
593         if (error != 0)
594                 goto out;
595         
596         tv.tv_sec = 1;
597         tv.tv_usec = 0;
598         bzero(&sopt, sizeof(sopt));
599         sopt.sopt_level = SOL_SOCKET;
600         sopt.sopt_name = SO_RCVTIMEO;
601         sopt.sopt_val = &tv;
602         sopt.sopt_valsize = sizeof tv;
603         
604         error = sosetopt(so, &sopt);
605         if (error != 0)
606                 goto out;
607         
608         /*
609          * Enable broadcast.
610          */
611         on = 1;
612         sopt.sopt_name = SO_BROADCAST;
613         sopt.sopt_val = &on;
614         sopt.sopt_valsize = sizeof on;
615
616         error = sosetopt(so, &sopt);
617         if (error != 0)
618                 goto out;
619
620         /*
621          * Disable routing.
622          */
623
624         on = 1;
625         sopt.sopt_name = SO_DONTROUTE;
626         sopt.sopt_val = &on;
627         sopt.sopt_valsize = sizeof on;
628
629         error = sosetopt(so, &sopt);
630         if (error != 0)
631                 goto out;
632         
633         /*
634          * Bind the local endpoint to a bootp client port.
635          */
636         sin = &dst;
637         clear_sinaddr(sin);
638         sin->sin_port = htons(IPPORT_BOOTPC);
639         error = sobind(so, (struct sockaddr *)sin, td);
640         if (error != 0) {
641                 kprintf("bind failed\n");
642                 goto out;
643         }
644         
645         /*
646          * Setup socket address for the server.
647          */
648         sin = &dst;
649         clear_sinaddr(sin);
650         sin->sin_addr.s_addr = INADDR_BROADCAST;
651         sin->sin_port = htons(IPPORT_BOOTPS);
652         
653         /*
654          * Send it, repeatedly, until a reply is received,
655          * but delay each re-send by an increasing amount.
656          * If the delay hits the maximum, start complaining.
657          */
658         timo = 0;
659         rtimo = 0;
660         for (;;) {
661                 
662                 outstanding = 0;
663                 gotrootpath = 0;
664
665                 for (ifctx = gctx->interfaces;
666                      ifctx != NULL;
667                      ifctx = ifctx->next) {
668                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
669                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
670                                        ifctx->replylen,
671                                        TAG_ROOT) != NULL)
672                                 gotrootpath = 1;
673                 }
674                 
675                 for (ifctx = gctx->interfaces;
676                      ifctx != NULL;
677                      ifctx = ifctx->next) {
678                         ifctx->outstanding = 0;
679                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
680                             gotrootpath != 0) {
681                                 continue;
682                         }
683                         if (bootpc_ifctx_isfailed(ifctx) != 0)
684                                 continue;
685
686                         outstanding++;
687                         ifctx->outstanding = 1;
688
689                         /* Proceed to next step in DHCP negotiation */
690                         if ((ifctx->state == IF_DHCP_OFFERED &&
691                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
692                             (ifctx->state == IF_DHCP_UNRESOLVED &&
693                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
694                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
695                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
696                                 ifctx->sentmsg = 0;
697                                 bootpc_compose_query(ifctx, gctx, td);
698                         }
699                         
700                         /* Send BOOTP request (or re-send). */
701                 
702                         if (ifctx->sentmsg == 0) {
703                                 switch(ifctx->dhcpquerytype) {
704                                 case DHCP_DISCOVER:
705                                         s = "DHCP Discover";
706                                         break;
707                                 case DHCP_REQUEST:
708                                         s = "DHCP Request";
709                                         break;
710                                 case DHCP_NOMSG:
711                                 default:
712                                         s = "BOOTP Query";
713                                         break;
714                                 }
715                                 kprintf("Sending %s packet from "
716                                        "interface %s (%*D)\n",
717                                        s,
718                                        ifctx->ireq.ifr_name,
719                                        ifctx->sdl->sdl_alen,
720                                        (unsigned char *) LLADDR(ifctx->sdl),
721                                        ":");
722                                 ifctx->sentmsg = 1;
723                         }
724
725                         aio.iov_base = (caddr_t) &ifctx->call;
726                         aio.iov_len = sizeof(ifctx->call);
727                         
728                         auio.uio_iov = &aio;
729                         auio.uio_iovcnt = 1;
730                         auio.uio_segflg = UIO_SYSSPACE;
731                         auio.uio_rw = UIO_WRITE;
732                         auio.uio_offset = 0;
733                         auio.uio_resid = sizeof(ifctx->call);
734                         auio.uio_td = td;
735                         
736                         /* Set netmask to 0.0.0.0 */
737                         
738                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
739                         clear_sinaddr(sin);
740                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
741                                         (caddr_t) &ifctx->ireq, proc0.p_ucred);
742                         if (error != 0)
743                                 panic("bootpc_call:"
744                                       "set if netmask, error=%d",
745                                       error);
746         
747                         error = sosend(so, (struct sockaddr *) &dst,
748                                        &auio, NULL, NULL, 0, td);
749                         if (error != 0) {
750                                 kprintf("bootpc_call: sosend: %d state %08x\n",
751                                        error, (int) so->so_state);
752                         }
753
754                         /* XXX: Is this needed ? */
755                         tsleep(&error, 0, "bootpw", 10);
756                         
757                         /* Set netmask to 255.0.0.0 */
758                         
759                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
760                         clear_sinaddr(sin);
761                         sin->sin_addr.s_addr = htonl(0xff000000u);
762                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
763                                         (caddr_t) &ifctx->ireq, proc0.p_ucred);
764                         if (error != 0)
765                                 panic("bootpc_call:"
766                                       "set if netmask, error=%d",
767                                       error);
768                         
769                 }
770                 
771                 if (outstanding == 0 &&
772                     (rtimo == 0 || time_second >= rtimo)) {
773                         error = 0;
774                         goto gotreply;
775                 }
776                 
777                 /* Determine new timeout. */
778                 if (timo < MAX_RESEND_DELAY)
779                         timo++;
780                 else {
781                         kprintf("DHCP/BOOTP timeout for server ");
782                         print_sin_addr(&dst);
783                         kprintf("\n");
784                 }
785                 
786                 /*
787                  * Wait for up to timo seconds for a reply.
788                  * The socket receive timeout was set to 1 second.
789                  */
790                 atimo = timo + time_second;
791                 while (time_second < atimo) {
792                         aio.iov_base = (caddr_t) &gctx->reply;
793                         aio.iov_len = sizeof(gctx->reply);
794                         
795                         auio.uio_iov = &aio;
796                         auio.uio_iovcnt = 1;
797                         auio.uio_segflg = UIO_SYSSPACE;
798                         auio.uio_rw = UIO_READ;
799                         auio.uio_offset = 0;
800                         auio.uio_resid = sizeof(gctx->reply);
801                         auio.uio_td = td;
802                         
803                         rcvflg = 0;
804                         error = soreceive(so, NULL, &auio,
805                                           NULL, NULL, &rcvflg);
806                         gctx->secs = time_second - gctx->starttime;
807                         for (ifctx = gctx->interfaces;
808                              ifctx != NULL;
809                              ifctx = ifctx->next) {
810                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
811                                     bootpc_ifctx_isfailed(ifctx) != 0)
812                                         continue;
813                                 
814                                 ifctx->call.secs = htons(gctx->secs);
815                         }
816                         if (error == EWOULDBLOCK)
817                                 continue;
818                         if (error != 0)
819                                 goto out;
820                         len = sizeof(gctx->reply) - auio.uio_resid;
821                         
822                         /* Do we have the required number of bytes ? */
823                         if (len < BOOTP_MIN_LEN)
824                                 continue;
825                         gctx->replylen = len;
826                         
827                         /* Is it a reply? */
828                         if (gctx->reply.op != BOOTP_REPLY)
829                                 continue;
830                         
831                         /* Is this an answer to our query */
832                         for (ifctx = gctx->interfaces;
833                              ifctx != NULL;
834                              ifctx = ifctx->next) {
835                                 if (gctx->reply.xid != ifctx->call.xid)
836                                         continue;
837                                 
838                                 /* Same HW address size ? */
839                                 if (gctx->reply.hlen != ifctx->call.hlen)
840                                         continue;
841                                 
842                                 /* Correct HW address ? */
843                                 if (bcmp(gctx->reply.chaddr,
844                                          ifctx->call.chaddr,
845                                          ifctx->call.hlen) != 0)
846                                         continue;
847
848                                 break;
849                         }
850
851                         if (ifctx != NULL) {
852                                 s =  bootpc_tag(&gctx->tmptag,
853                                                 &gctx->reply,
854                                                 gctx->replylen,
855                                                 TAG_DHCP_MSGTYPE);
856                                 if (s != NULL) {
857                                         switch (*s) {
858                                         case DHCP_OFFER:
859                                                 s = "DHCP Offer";
860                                                 break;
861                                         case DHCP_ACK:
862                                                 s = "DHCP Ack";
863                                                 break;
864                                         default:
865                                                 s = "DHCP (unexpected)";
866                                                 break;
867                                         }
868                                 } else
869                                         s = "BOOTP Reply";
870
871                                 kprintf("Received %s packet"
872                                        " on %s from ",
873                                        s,
874                                        ifctx->ireq.ifr_name);
875                                 print_in_addr(gctx->reply.siaddr);
876                                 if (gctx->reply.giaddr.s_addr !=
877                                     htonl(INADDR_ANY)) {
878                                         kprintf(" via ");
879                                         print_in_addr(gctx->reply.giaddr);
880                                 }
881                                 if (bootpc_received(gctx, ifctx) != 0) {
882                                         kprintf(" (accepted)");
883                                         if (ifctx->outstanding) {
884                                                 ifctx->outstanding = 0;
885                                                 outstanding--;
886                                         }
887                                         /* Network settle delay */
888                                         if (outstanding == 0)
889                                                 atimo = time_second +
890                                                         BOOTP_SETTLE_DELAY;
891                                 } else
892                                         kprintf(" (ignored)");
893                                 if (ifctx->gotrootpath) {
894                                         gotrootpath = 1;
895                                         rtimo = time_second +
896                                                 BOOTP_SETTLE_DELAY;
897                                         kprintf(" (got root path)");
898                                 } else
899                                         kprintf(" (no root path)");
900                                 kprintf("\n");
901                         }
902                 } /* while secs */
903 #ifdef BOOTP_TIMEOUT
904                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
905                         break;
906 #endif
907                 /* Force a retry if halfway in DHCP negotiation */
908                 retry = 0;
909                 for (ifctx = gctx->interfaces; ifctx != NULL;
910                      ifctx = ifctx->next) {
911                         if (ifctx->state == IF_DHCP_OFFERED) {
912                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
913                                         retry = 1;
914                                 else
915                                         ifctx->state = IF_DHCP_UNRESOLVED;
916                         }
917                 }
918                 
919                 if (retry != 0)
920                         continue;
921                 
922                 if (gotrootpath != 0) {
923                         gctx->gotrootpath = gotrootpath;
924                         if (rtimo != 0 && time_second >= rtimo)
925                                 break;
926                 }
927         } /* forever send/receive */
928         
929         /* 
930          * XXX: These are errors of varying seriousness being silently
931          * ignored
932          */
933
934         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
935                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
936                         kprintf("%s timeout for interface %s\n",
937                                ifctx->dhcpquerytype != DHCP_NOMSG ?
938                                "DHCP" : "BOOTP",
939                                ifctx->ireq.ifr_name);
940                 }
941         }
942         if (gctx->gotrootpath != 0) {
943 #if 0
944                 kprintf("Got a root path, ignoring remaining timeout\n");
945 #endif
946                 error = 0;
947                 goto out;
948         }
949 #ifndef BOOTP_NFSROOT
950         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
951                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
952                         error = 0;
953                         goto out;
954                 }
955         }
956 #endif
957         error = ETIMEDOUT;
958         goto out;
959         
960 gotreply:
961 out:
962         soclose(so, FNONBLOCK);
963         return error;
964 }
965
966
967 static int
968 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
969                         struct bootpc_globalcontext *gctx,
970                         struct thread *td)
971 {
972         struct ifaddr_container *ifac;
973         struct sockaddr_in *sin;
974         int error;
975         
976         struct ifreq *ireq;
977         struct socket *so;
978         struct sockaddr_dl *sdl;
979
980         error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
981         if (error != 0)
982                 panic("nfs_boot: socreate, error=%d", error);
983         
984         ireq = &ifctx->ireq;
985         so = ifctx->so;
986
987         /*
988          * Bring up the interface.
989          *
990          * Get the old interface flags and or IFF_UP into them; if
991          * IFF_UP set blindly, interface selection can be clobbered.
992          */
993         error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
994         if (error != 0)
995                 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
996         ireq->ifr_flags |= IFF_UP;
997         error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
998         if (error != 0)
999                 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1000         
1001         /*
1002          * Do enough of ifconfig(8) so that the chosen interface
1003          * can talk to the servers.  (just set the address)
1004          */
1005         
1006         /* addr is 0.0.0.0 */
1007         
1008         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1009         clear_sinaddr(sin);
1010         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1011         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1012                 panic("bootpc_fakeup_interface: "
1013                       "set if addr, error=%d", error);
1014         
1015         /* netmask is 255.0.0.0 */
1016         
1017         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1018         clear_sinaddr(sin);
1019         sin->sin_addr.s_addr = htonl(0xff000000u);
1020         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
1021         if (error != 0)
1022                 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1023                       error);
1024         
1025         /* Broadcast is 255.255.255.255 */
1026         
1027         sin = (struct sockaddr_in *)&ireq->ifr_addr;
1028         clear_sinaddr(sin);
1029         clear_sinaddr(&ifctx->broadcast);
1030         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1031         ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1032         
1033         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
1034         if (error != 0 && error != EADDRNOTAVAIL)
1035                 panic("bootpc_fakeup_interface: "
1036                       "set if broadcast addr, error=%d",
1037                       error);
1038         error = 0;
1039         
1040         /* Get HW address */
1041         
1042         sdl = NULL;
1043         TAILQ_FOREACH(ifac, &ifctx->ifp->if_addrheads[mycpuid], ifa_link) {
1044                 struct ifaddr *ifa = ifac->ifa;
1045
1046                 if (ifa->ifa_addr->sa_family == AF_LINK &&
1047                     (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1048                     sdl->sdl_type == IFT_ETHER)
1049                         break;
1050         }
1051
1052         if (sdl == NULL)
1053                 panic("bootpc: Unable to find HW address for %s",
1054                       ifctx->ireq.ifr_name);
1055         ifctx->sdl = sdl;
1056         
1057         return error;
1058 }
1059
1060
1061 static int
1062 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1063                         struct bootpc_globalcontext *gctx,
1064                         struct thread *td)
1065 {
1066         int error;
1067         struct sockaddr_in defdst;
1068         struct sockaddr_in defmask;
1069         struct sockaddr_in *sin;
1070         
1071         struct ifreq *ireq;
1072         struct socket *so;
1073         struct sockaddr_in *myaddr;
1074         struct sockaddr_in *netmask;
1075         struct sockaddr_in *gw;
1076
1077         ireq = &ifctx->ireq;
1078         so = ifctx->so;
1079         myaddr = &ifctx->myaddr;
1080         netmask = &ifctx->netmask;
1081         gw = &ifctx->gw;
1082
1083         if (bootpc_ifctx_isresolved(ifctx) == 0) {
1084
1085                 /* Shutdown interfaces where BOOTP failed */
1086                 
1087                 kprintf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1088                 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1089                 if (error != 0)
1090                         panic("bootpc_adjust_interface: "
1091                               "SIOCGIFFLAGS, error=%d", error);
1092                 ireq->ifr_flags &= ~IFF_UP;
1093                 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1094                 if (error != 0)
1095                         panic("bootpc_adjust_interface: "
1096                               "SIOCSIFFLAGS, error=%d", error);
1097                 
1098                 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1099                 clear_sinaddr(sin);
1100                 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
1101                 if (error != 0 && (error != EADDRNOTAVAIL ||
1102                                    ifctx == gctx->interfaces))
1103                         panic("bootpc_adjust_interface: "
1104                               "SIOCDIFADDR, error=%d", error);
1105                 
1106                 return 0;
1107         }
1108
1109         kprintf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1110         /*
1111          * Do enough of ifconfig(8) so that the chosen interface
1112          * can talk to the servers.  (just set the address)
1113          */
1114         bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1115         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
1116         if (error != 0)
1117                 panic("bootpc_adjust_interface: "
1118                       "set if netmask, error=%d", error);
1119         
1120         /* Broadcast is with host part of IP address all 1's */
1121         
1122         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1123         clear_sinaddr(sin);
1124         sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1125                 ~ netmask->sin_addr.s_addr;
1126         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
1127         if (error != 0)
1128                 panic("bootpc_adjust_interface: "
1129                       "set if broadcast addr, error=%d", error);
1130         
1131         bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1132         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1133         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1134                 panic("bootpc_adjust_interface: "
1135                       "set if addr, error=%d", error);
1136         
1137         /* Add new default route */
1138
1139         if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1140                 clear_sinaddr(&defdst);
1141                 clear_sinaddr(&defmask);
1142                 error = rtrequest_global(RTM_ADD, (struct sockaddr *) &defdst,
1143                                          (struct sockaddr *) gw,
1144                                          (struct sockaddr *) &defmask,
1145                                          (RTF_UP | RTF_GATEWAY | RTF_STATIC));
1146                 if (error != 0) {
1147                         kprintf("bootpc_adjust_interface: "
1148                                "add net route, error=%d\n", error);
1149                         return error;
1150                 }
1151         }
1152         
1153         return 0;
1154 }
1155
1156 static void
1157 print_sin_addr(struct sockaddr_in *sin)
1158 {
1159         print_in_addr(sin->sin_addr);
1160 }
1161
1162
1163 static void
1164 print_in_addr(struct in_addr addr)
1165 {
1166         unsigned int ip;
1167         
1168         ip = ntohl(addr.s_addr);
1169         kprintf("%d.%d.%d.%d",
1170                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1171 }
1172
1173 static void
1174 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1175                      struct bootpc_globalcontext *gctx, struct thread *td)
1176 {
1177         unsigned char *vendp;
1178         unsigned char vendor_client[64];
1179         uint32_t leasetime;
1180         uint8_t vendor_client_len;
1181
1182         ifctx->gotrootpath = 0;
1183
1184         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1185         
1186         /* bootpc part */
1187         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
1188         ifctx->call.htype = 1;                  /* 10mb ethernet */
1189         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1190         ifctx->call.hops = 0;
1191         if (bootpc_ifctx_isunresolved(ifctx) != 0)
1192                 ifctx->xid++;
1193         ifctx->call.xid = txdr_unsigned(ifctx->xid);
1194         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1195         
1196         vendp = ifctx->call.vend;
1197         *vendp++ = 99;          /* RFC1048 cookie */
1198         *vendp++ = 130;
1199         *vendp++ = 83;
1200         *vendp++ = 99;
1201         *vendp++ = TAG_MAXMSGSIZE;
1202         *vendp++ = 2;
1203         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1204         *vendp++ = sizeof(struct bootp_packet) & 255;
1205
1206         ksnprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1207                 ostype, MACHINE, osrelease);
1208         vendor_client_len = strlen(vendor_client);
1209         *vendp++ = TAG_VENDOR_INDENTIFIER;
1210         *vendp++ = vendor_client_len;
1211         memcpy(vendp, vendor_client, vendor_client_len);
1212         vendp += vendor_client_len;
1213         ifctx->dhcpquerytype = DHCP_NOMSG;
1214         switch (ifctx->state) {
1215         case IF_DHCP_UNRESOLVED:
1216                 *vendp++ = TAG_DHCP_MSGTYPE;
1217                 *vendp++ = 1;
1218                 *vendp++ = DHCP_DISCOVER;
1219                 ifctx->dhcpquerytype = DHCP_DISCOVER;
1220                 ifctx->gotdhcpserver = 0;
1221                 break;
1222         case IF_DHCP_OFFERED:
1223                 *vendp++ = TAG_DHCP_MSGTYPE;
1224                 *vendp++ = 1;
1225                 *vendp++ = DHCP_REQUEST;
1226                 ifctx->dhcpquerytype = DHCP_REQUEST;
1227                 *vendp++ = TAG_DHCP_REQ_ADDR;
1228                 *vendp++ = 4;
1229                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1230                 vendp += 4;
1231                 if (ifctx->gotdhcpserver != 0) {
1232                         *vendp++ = TAG_DHCP_SERVERID;
1233                         *vendp++ = 4;
1234                         memcpy(vendp, &ifctx->dhcpserver, 4);
1235                         vendp += 4;
1236                 }
1237                 *vendp++ = TAG_DHCP_LEASETIME;
1238                 *vendp++ = 4;
1239                 leasetime = htonl(300);
1240                 memcpy(vendp, &leasetime, 4);
1241                 vendp += 4;
1242         default:
1243                 ;
1244         }
1245         *vendp = TAG_END;
1246         
1247         ifctx->call.secs = 0;
1248         ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1249 }
1250
1251
1252 static int
1253 bootpc_hascookie(struct bootp_packet *bp)
1254 {
1255         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1256                 bp->vend[2] == 83 && bp->vend[3] == 99);
1257 }
1258
1259
1260 static void
1261 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1262                   unsigned char *start, int len, int tag)
1263 {
1264         unsigned char *j;
1265         unsigned char *ej;
1266         unsigned char code;
1267
1268         if (tctx->badtag != 0 || tctx->badopt != 0)
1269                 return;
1270         
1271         j = start;
1272         ej = j + len;
1273         
1274         while (j < ej) {
1275                 code = *j++;
1276                 if (code == TAG_PAD)
1277                         continue;
1278                 if (code == TAG_END)
1279                         return;
1280                 if (j >= ej || j + *j + 1 > ej) {
1281                         tctx->badopt = 1;
1282                         return;
1283                 }
1284                 len = *j++;
1285                 if (code == tag) {
1286                         if (tctx->taglen + len > TAG_MAXLEN) {
1287                                 tctx->badtag = 1;
1288                                 return;
1289                         }
1290                         tctx->foundopt = 1;
1291                         if (len > 0)
1292                                 memcpy(tctx->buf + tctx->taglen,
1293                                        j, len);
1294                         tctx->taglen += len;
1295                 }
1296                 if (code == TAG_OVERLOAD)
1297                         tctx->overload = *j;
1298                 
1299                 j += len;
1300         }
1301 }
1302
1303
1304 static unsigned char *
1305 bootpc_tag(struct bootpc_tagcontext *tctx, struct bootp_packet *bp,
1306            int len, int tag)
1307 {
1308         unsigned char *j;
1309         unsigned char *ej;
1310
1311         tctx->overload = 0;
1312         tctx->badopt = 0;
1313         tctx->badtag = 0;
1314         tctx->foundopt = 0;
1315         tctx->taglen = 0;
1316
1317         if (bootpc_hascookie(bp) == 0)
1318                 return NULL;
1319         
1320         j = &bp->vend[4];
1321         ej = (unsigned char *) bp + len;
1322
1323         bootpc_tag_helper(tctx, &bp->vend[4],
1324                           (unsigned char *) bp + len - &bp->vend[4], tag);
1325         
1326         if ((tctx->overload & OVERLOAD_FILE) != 0)
1327                 bootpc_tag_helper(tctx,
1328                                   (unsigned char *) bp->file,
1329                                   sizeof(bp->file),
1330                                   tag);
1331         if ((tctx->overload & OVERLOAD_SNAME) != 0)
1332                 bootpc_tag_helper(tctx,
1333                                   (unsigned char *) bp->sname,
1334                                   sizeof(bp->sname),
1335                                   tag);
1336         
1337         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1338                 return NULL;
1339         tctx->buf[tctx->taglen] = '\0';
1340         return tctx->buf;
1341 }
1342
1343
1344 static void
1345 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1346                     struct bootpc_globalcontext *gctx)
1347 {
1348         char *p;
1349         unsigned int ip;
1350
1351         ifctx->gotgw = 0;
1352         ifctx->gotnetmask = 0;
1353
1354         clear_sinaddr(&ifctx->myaddr);
1355         clear_sinaddr(&ifctx->netmask);
1356         clear_sinaddr(&ifctx->gw);
1357         
1358         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1359         
1360         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1361         ksnprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1362                  "swap.%d.%d.%d.%d",
1363                  ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1364         
1365         kprintf("%s at ", ifctx->ireq.ifr_name);
1366         print_sin_addr(&ifctx->myaddr);
1367         kprintf(" server ");
1368         print_in_addr(ifctx->reply.siaddr);
1369         
1370         ifctx->gw.sin_addr = ifctx->reply.giaddr;
1371         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1372                 kprintf(" via gateway ");
1373                 print_in_addr(ifctx->reply.giaddr);
1374         }
1375
1376         /* This call used for the side effect (overload flag) */
1377         (void) bootpc_tag(&gctx->tmptag,
1378                           &ifctx->reply, ifctx->replylen, TAG_END);
1379         
1380         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1381                 if (ifctx->reply.sname[0] != '\0')
1382                         kprintf(" server name %s", ifctx->reply.sname);
1383         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1384                 if (ifctx->reply.file[0] != '\0')
1385                         kprintf(" boot file %s", ifctx->reply.file);
1386         
1387         kprintf("\n");
1388
1389         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1390                        TAG_SUBNETMASK);
1391         if (p != NULL) {
1392                 if (gctx->tag.taglen != 4)
1393                         panic("bootpc: subnet mask len is %d",
1394                               gctx->tag.taglen);
1395                 bcopy(p, &ifctx->netmask.sin_addr, 4);
1396                 ifctx->gotnetmask = 1;
1397                 kprintf("subnet mask ");
1398                 print_sin_addr(&ifctx->netmask);
1399                 kprintf(" ");
1400         }
1401         
1402         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1403                        TAG_ROUTERS);
1404         if (p != NULL) {
1405                 /* Routers */
1406                 if (gctx->tag.taglen % 4)
1407                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
1408                 if (gctx->tag.taglen > 0) {
1409                         bcopy(p, &ifctx->gw.sin_addr, 4);
1410                         kprintf("router ");
1411                         print_sin_addr(&ifctx->gw);
1412                         kprintf(" ");
1413                         ifctx->gotgw = 1;
1414                         gctx->gotgw = 1;
1415                 }
1416         }
1417         
1418         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1419                        TAG_ROOT);
1420         if (p != NULL) {
1421                 if (gctx->setrootfs != NULL) {
1422                         kprintf("rootfs %s (ignored) ", p);
1423                 } else  if (setfs(&nd->root_saddr,
1424                                   nd->root_hostnam, p)) {
1425                         kprintf("rootfs %s ",p);
1426                         gctx->gotrootpath = 1;
1427                         ifctx->gotrootpath = 1;
1428                         gctx->setrootfs = ifctx;
1429                         
1430                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1431                                        ifctx->replylen,
1432                                        TAG_ROOTOPTS);
1433                         if (p != NULL) {
1434                                 nfs_mountopts(&nd->root_args, p);
1435                                 kprintf("rootopts %s ", p);
1436                         }
1437                 } else
1438                         panic("Failed to set rootfs to %s",p);
1439         }
1440
1441         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1442                        TAG_SWAP);
1443         if (p != NULL) {
1444                 if (gctx->setswapfs != NULL) {
1445                         kprintf("swapfs %s (ignored) ", p);
1446                 } else  if (setfs(&nd->swap_saddr,
1447                                   nd->swap_hostnam, p)) {
1448                         gctx->gotswappath = 1;
1449                         gctx->setswapfs = ifctx;
1450                         kprintf("swapfs %s ", p);
1451
1452                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1453                                        ifctx->replylen,
1454                                        TAG_SWAPOPTS);
1455                         if (p != NULL) {
1456                                 /* swap mount options */
1457                                 nfs_mountopts(&nd->swap_args, p);
1458                                 kprintf("swapopts %s ", p);
1459                         }
1460                         
1461                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1462                                        ifctx->replylen,
1463                                        TAG_SWAPSIZE);
1464                         if (p != NULL) {
1465                                 int swaplen;
1466                                 if (gctx->tag.taglen != 4)
1467                                         panic("bootpc: "
1468                                               "Expected 4 bytes for swaplen, "
1469                                               "not %d bytes",
1470                                               gctx->tag.taglen);
1471                                 bcopy(p, &swaplen, 4);
1472                                 nd->swap_nblks = ntohl(swaplen);
1473                                 kprintf("swapsize %d KB ",
1474                                        nd->swap_nblks);
1475                         }
1476                 } else
1477                         panic("Failed to set swapfs to %s", p);
1478         }
1479
1480         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1481                        TAG_HOSTNAME);
1482         if (p != NULL) {
1483                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1484                         panic("bootpc: hostname >= %d bytes",
1485                               MAXHOSTNAMELEN);
1486                 if (gctx->sethostname != NULL) {
1487                         kprintf("hostname %s (ignored) ", p);
1488                 } else {
1489                         strcpy(nd->my_hostnam, p);
1490                         strcpy(hostname, p);
1491                         kprintf("hostname %s ",hostname);
1492                         gctx->sethostname = ifctx;
1493                 }
1494         }
1495         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1496                        TAG_COOKIE);
1497         if (p != NULL) {        /* store in a sysctl variable */
1498                 int i, l = sizeof(bootp_cookie) - 1;
1499                 for (i = 0; i < l && p[i] != '\0'; i++)
1500                         bootp_cookie[i] = p[i];
1501                 p[i] = '\0';
1502         }
1503
1504         kprintf("\n");
1505         
1506         if (ifctx->gotnetmask == 0) {
1507                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1508                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1509                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1510                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1511                 else
1512                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1513         }
1514         if (ifctx->gotgw == 0) {
1515                 /* Use proxyarp */
1516                 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1517         }
1518 }
1519
1520 void
1521 bootpc_init(void)
1522 {
1523         struct bootpc_ifcontext *ifctx, *nctx;  /* Interface BOOTP contexts */
1524         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
1525         struct ifnet *ifp;
1526         int error;
1527         struct nfsv3_diskless *nd;
1528         struct thread *td;
1529
1530         nd = &nfsv3_diskless;
1531         td = curthread;
1532         
1533         /*
1534          * If already filled in, don't touch it here
1535          */
1536         if (nfs_diskless_valid != 0)
1537                 return;
1538
1539         /*
1540          * Wait until arp entries can be handled.
1541          */
1542         while (time_second == 0)
1543                 tsleep(&time_second, 0, "arpkludge", 10);
1544         
1545         gctx = kmalloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1546         
1547         gctx->xid = ~0xFFFF;
1548         gctx->starttime = time_second;
1549         
1550         ifctx = allocifctx(gctx);
1551
1552         /*
1553          * Find a network interface.
1554          */
1555 #ifdef BOOTP_WIRED_TO
1556         kprintf("bootpc_init: wired to interface '%s'\n",
1557                __XSTRING(BOOTP_WIRED_TO));
1558 #endif
1559         bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1560         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1561                 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1562                          sizeof(ifctx->ireq.ifr_name));
1563 #ifdef BOOTP_WIRED_TO
1564                 if (strcmp(ifctx->ireq.ifr_name,
1565                            __XSTRING(BOOTP_WIRED_TO)) != 0)
1566                         continue;
1567 #else
1568                 if ((ifp->if_flags &
1569                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1570                     IFF_BROADCAST)
1571                         continue;
1572 #endif
1573                 if (gctx->interfaces != NULL)
1574                         gctx->lastinterface->next = ifctx;
1575                 else
1576                         gctx->interfaces = ifctx;
1577                 ifctx->ifp = ifp;
1578                 gctx->lastinterface = ifctx;
1579                 ifctx = allocifctx(gctx);
1580         }
1581         kfree(ifctx, M_TEMP);
1582         
1583         if (gctx->interfaces == NULL) {
1584 #ifdef BOOTP_WIRED_TO
1585                 panic("bootpc_init: Could not find interface specified "
1586                       "by BOOTP_WIRED_TO: "
1587                       __XSTRING(BOOTP_WIRED_TO));
1588 #else
1589                 panic("bootpc_init: no suitable interface");
1590 #endif
1591         }
1592                 
1593         gctx->gotrootpath = 0;
1594         gctx->gotswappath = 0;
1595         gctx->gotgw = 0;
1596         
1597         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1598                 bootpc_fakeup_interface(ifctx, gctx, td);
1599         
1600         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1601                 bootpc_compose_query(ifctx, gctx, td);
1602         
1603         ifctx = gctx->interfaces;
1604         error = bootpc_call(gctx, td);
1605         
1606         if (error != 0) {
1607 #ifdef BOOTP_NFSROOT
1608                 panic("BOOTP call failed");
1609 #else
1610                 kprintf("BOOTP call failed\n");
1611 #endif
1612         }
1613         
1614         nfs_mountopts(&nd->root_args, NULL);
1615         
1616         nfs_mountopts(&nd->swap_args, NULL);
1617
1618         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1619                 if (bootpc_ifctx_isresolved(ifctx) != 0)
1620                         bootpc_decode_reply(nd, ifctx, gctx);
1621         
1622         if (gctx->gotswappath == 0)
1623                 nd->swap_nblks = 0;
1624 #ifdef BOOTP_NFSROOT
1625         if (gctx->gotrootpath == 0)
1626                 panic("bootpc: No root path offered");
1627 #endif
1628         
1629         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1630                 bootpc_adjust_interface(ifctx, gctx, td);
1631                 
1632                 soclose(ifctx->so, FNONBLOCK);
1633         }
1634
1635         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1636                 if (ifctx->gotrootpath != 0)
1637                         break;
1638         if (ifctx == NULL) {
1639                 for (ifctx = gctx->interfaces;
1640                      ifctx != NULL;
1641                      ifctx = ifctx->next)
1642                         if (bootpc_ifctx_isresolved(ifctx) != 0)
1643                                 break;
1644         }
1645         if (ifctx == NULL)
1646                 goto out;
1647         
1648         if (gctx->gotrootpath != 0) {
1649                 
1650                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1651                                  nd->root_fh, &nd->root_fhsize,
1652                                  &nd->root_args, td);
1653                 if (error != 0)
1654                         panic("nfs_boot: mountd root, error=%d", error);
1655     
1656                 if (gctx->gotswappath != 0) {
1657                         
1658                         error = md_mount(&nd->swap_saddr,
1659                                          nd->swap_hostnam,
1660                                          nd->swap_fh, &nd->swap_fhsize,
1661                                          &nd->swap_args, td);
1662                         if (error != 0)
1663                                 panic("nfs_boot: mountd swap, error=%d",
1664                                       error);
1665                         
1666                         error = md_lookup_swap(&nd->swap_saddr,
1667                                                gctx->lookup_path,
1668                                                nd->swap_fh, &nd->swap_fhsize,
1669                                                &nd->swap_args, td);
1670                         if (error != 0)
1671                                 panic("nfs_boot: lookup swap, error=%d",
1672                                       error);
1673                 }
1674                 nfs_diskless_valid = 3;
1675         }
1676         
1677         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1678         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1679         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1680         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1681                 ifctx->myaddr.sin_addr.s_addr |
1682                 ~ ifctx->netmask.sin_addr.s_addr;
1683         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1684         
1685 out:
1686         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1687                 nctx = ifctx->next;
1688                 kfree(ifctx, M_TEMP);
1689         }
1690         kfree(gctx, M_TEMP);
1691 }
1692