2 * Copyright (c) 1995 Gordon Ross, Adam Glass
3 * Copyright (c) 1992 Regents of the University of California.
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.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
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 1.24 2008/01/06 16:55:53 swildner Exp $
44 #include "opt_bootp.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
49 #include <sys/sockio.h>
51 #include <sys/malloc.h>
52 #include <sys/mount.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56 #include <sys/sysctl.h>
58 #include <sys/fcntl.h>
61 #include <net/route.h>
63 #include <netinet/in.h>
64 #include <net/if_types.h>
65 #include <net/if_dl.h>
70 #include "nfsdiskless.h"
73 #include "nfsmountrpc.h"
75 #define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */
77 #ifndef BOOTP_SETTLE_DELAY
78 #define BOOTP_SETTLE_DELAY 3
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.
87 #define MAX_RESEND_DELAY 5 /* seconds */
89 /* Definitions from RFC951 */
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];
105 unsigned char vend[1222];
108 struct bootpc_ifcontext {
109 struct bootpc_ifcontext *next;
110 struct bootp_packet call;
111 struct bootp_packet reply;
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 */
137 int dhcpquerytype; /* dhcp type sent */
138 struct in_addr dhcpserver;
142 #define TAG_MAXLEN 1024
143 struct bootpc_tagcontext {
144 char buf[TAG_MAXLEN + 1];
152 struct bootpc_globalcontext {
153 struct bootpc_ifcontext *interfaces;
154 struct bootpc_ifcontext *lastinterface;
162 struct bootp_packet reply;
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;
172 #define IPPORT_BOOTPC 68
173 #define IPPORT_BOOTPS 67
175 #define BOOTP_REQUEST 1
176 #define BOOTP_REPLY 2
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 */
185 /* DHCP specific tags */
186 #define TAG_OVERLOAD 52 /* Option Overload */
187 #define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */
189 #define TAG_END 255 /* End Option (i.e. no more options) */
191 /* Overload values */
192 #define OVERLOAD_FILE 1
193 #define OVERLOAD_SNAME 2
195 /* Site specific tags: */
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 */
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
207 #define TAG_VENDOR_INDENTIFIER 60
210 #define DHCP_DISCOVER 1
212 #define DHCP_REQUEST 3
215 extern struct nfsv3_diskless nfsv3_diskless;
216 static char bootp_cookie[128];
217 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
218 bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
221 static void print_in_addr(struct in_addr addr);
222 static void print_sin_addr(struct sockaddr_in *addr);
223 static void clear_sinaddr(struct sockaddr_in *sin);
225 struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
226 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
227 struct bootpc_globalcontext *gctx,
229 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
230 struct bootp_packet *bp, int len, int tag);
231 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
232 unsigned char *start, int len, int tag);
235 void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
236 void bootpboot_p_ma(struct sockaddr *ma);
237 void bootpboot_p_rtentry(struct rtentry *rt);
238 void bootpboot_p_tree(struct radix_node *rn);
239 void bootpboot_p_rtlist(void);
240 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
241 void bootpboot_p_iflist(void);
244 static int bootpc_call(struct bootpc_globalcontext *gctx,
247 static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
248 struct bootpc_globalcontext *gctx,
251 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
252 struct bootpc_globalcontext *gctx,
255 static void bootpc_decode_reply(struct nfsv3_diskless *nd,
256 struct bootpc_ifcontext *ifctx,
257 struct bootpc_globalcontext *gctx);
259 static int bootpc_received(struct bootpc_globalcontext *gctx,
260 struct bootpc_ifcontext *ifctx);
262 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
263 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
264 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
266 void bootpc_init(void);
269 * In order to have multiple active interfaces with address 0.0.0.0
270 * and be able to send data to a selected interface, we perform
273 * - The 'broadcast' address is different for each interface.
275 * - We temporarily add routing pointing 255.255.255.255 to the
276 * selected interface broadcast address, thus the packet sent
277 * goes to that interface.
282 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
285 kprintf("(sockaddr *) <null>");
288 switch (sa->sa_family) {
291 struct sockaddr_in *sin;
293 sin = (struct sockaddr_in *) sa;
297 sin = (struct sockaddr_in *) ma;
305 struct sockaddr_dl *sli;
308 sli = (struct sockaddr_dl *) sa;
309 kprintf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
310 for (i = 0; i < sli->sdl_alen; i++) {
313 kprintf("%x", ((unsigned char *) LLADDR(sli))[i]);
318 kprintf("af%d", sa->sa_family);
324 bootpboot_p_ma(struct sockaddr *ma)
330 kprintf("%x", *(int *)ma);
335 bootpboot_p_rtentry(struct rtentry *rt)
337 bootpboot_p_sa(rt_key(rt), rt_mask(rt));
339 bootpboot_p_ma(rt->rt_genmask);
341 bootpboot_p_sa(rt->rt_gateway, NULL);
343 kprintf("flags %x", (unsigned short) rt->rt_flags);
344 kprintf(" %d", (int) rt->rt_rmx.rmx_expire);
345 kprintf(" %s\n", if_name(rt->rt_ifp));
350 bootpboot_p_tree(struct radix_node *rn)
353 if (rn->rn_bit < 0) {
354 if ((rn->rn_flags & RNF_ROOT) != 0) {
356 bootpboot_p_rtentry((struct rtentry *) rn);
358 rn = rn->rn_dupedkey;
360 bootpboot_p_tree(rn->rn_left);
361 bootpboot_p_tree(rn->rn_right);
369 bootpboot_p_rtlist(void)
371 kprintf("Routing table:\n");
372 bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
377 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
379 kprintf("%s flags %x, addr ",
381 (unsigned short) ifp->if_flags);
382 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
383 kprintf(", broadcast ");
384 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
385 kprintf(", netmask ");
386 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
392 bootpboot_p_iflist(void)
397 kprintf("Interface list:\n");
398 TAILQ_FOREACH(ifp, &ifnet, if_link) {
399 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
400 if (ifa->ifa_addr->sa_family == AF_INET)
401 bootpboot_p_if(ifp, ifa);
404 #endif /* defined(BOOTP_DEBUG) */
408 clear_sinaddr(struct sockaddr_in *sin)
410 bzero(sin, sizeof(*sin));
411 sin->sin_len = sizeof(*sin);
412 sin->sin_family = AF_INET;
413 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
418 static struct bootpc_ifcontext *
419 allocifctx(struct bootpc_globalcontext *gctx)
421 struct bootpc_ifcontext *ifctx;
422 ifctx = (struct bootpc_ifcontext *) kmalloc(sizeof(*ifctx),
424 bzero(ifctx, sizeof(*ifctx));
425 ifctx->xid = gctx->xid;
427 ifctx->state = IF_BOOTP_UNRESOLVED;
429 ifctx->state = IF_DHCP_UNRESOLVED;
437 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
439 if (ifctx->state == IF_BOOTP_RESOLVED ||
440 ifctx->state == IF_DHCP_RESOLVED)
447 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
449 if (ifctx->state == IF_BOOTP_UNRESOLVED ||
450 ifctx->state == IF_DHCP_UNRESOLVED)
457 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
459 if (ifctx->state == IF_BOOTP_FAILED ||
460 ifctx->state == IF_DHCP_FAILED)
467 bootpc_received(struct bootpc_globalcontext *gctx,
468 struct bootpc_ifcontext *ifctx)
470 unsigned char dhcpreplytype;
473 * Need timeout for fallback to less
474 * desirable alternative.
478 /* This call used for the side effect (badopt flag) */
479 (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
483 /* If packet is invalid, ignore it */
484 if (gctx->tmptag.badopt != 0)
487 p = bootpc_tag(&gctx->tmptag, &gctx->reply,
488 gctx->replylen, TAG_DHCP_MSGTYPE);
492 dhcpreplytype = DHCP_NOMSG;
494 switch (ifctx->dhcpquerytype) {
496 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */
497 #ifndef BOOTP_FORCE_DHCP
498 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */
504 if (dhcpreplytype != DHCP_ACK)
512 /* Ignore packet unless it gives us a root tag we didn't have */
514 if ((ifctx->state == IF_BOOTP_RESOLVED ||
515 (ifctx->dhcpquerytype == DHCP_DISCOVER &&
516 (ifctx->state == IF_DHCP_OFFERED ||
517 ifctx->state == IF_DHCP_RESOLVED))) &&
518 (bootpc_tag(&gctx->tmptag, &ifctx->reply,
521 bootpc_tag(&gctx->tmptag, &gctx->reply,
529 ifctx->replylen = gctx->replylen;
531 /* XXX: Only reset if 'perfect' response */
532 if (ifctx->state == IF_BOOTP_UNRESOLVED)
533 ifctx->state = IF_BOOTP_RESOLVED;
534 else if (ifctx->state == IF_DHCP_UNRESOLVED &&
535 ifctx->dhcpquerytype == DHCP_DISCOVER) {
536 if (dhcpreplytype == DHCP_OFFER)
537 ifctx->state = IF_DHCP_OFFERED;
539 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */
540 } else if (ifctx->state == IF_DHCP_OFFERED &&
541 ifctx->dhcpquerytype == DHCP_REQUEST)
542 ifctx->state = IF_DHCP_RESOLVED;
545 if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
546 ifctx->state != IF_BOOTP_RESOLVED) {
547 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
548 ifctx->replylen, TAG_DHCP_SERVERID);
549 if (p != NULL && gctx->tmptag.taglen == 4) {
550 memcpy(&ifctx->dhcpserver, p, 4);
551 ifctx->gotdhcpserver = 1;
553 ifctx->gotdhcpserver = 0;
557 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
560 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
562 TAG_ROUTERS) != NULL);
563 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
565 TAG_SUBNETMASK) != NULL);
570 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
573 struct sockaddr_in *sin, dst;
577 int error, on, rcvflg, timo, len;
581 struct bootpc_ifcontext *ifctx;
588 * Create socket and set its recieve timeout.
590 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
596 bzero(&sopt, sizeof(sopt));
597 sopt.sopt_level = SOL_SOCKET;
598 sopt.sopt_name = SO_RCVTIMEO;
600 sopt.sopt_valsize = sizeof tv;
602 error = sosetopt(so, &sopt);
610 sopt.sopt_name = SO_BROADCAST;
612 sopt.sopt_valsize = sizeof on;
614 error = sosetopt(so, &sopt);
623 sopt.sopt_name = SO_DONTROUTE;
625 sopt.sopt_valsize = sizeof on;
627 error = sosetopt(so, &sopt);
632 * Bind the local endpoint to a bootp client port.
636 sin->sin_port = htons(IPPORT_BOOTPC);
637 error = sobind(so, (struct sockaddr *)sin, td);
639 kprintf("bind failed\n");
644 * Setup socket address for the server.
648 sin->sin_addr.s_addr = INADDR_BROADCAST;
649 sin->sin_port = htons(IPPORT_BOOTPS);
652 * Send it, repeatedly, until a reply is received,
653 * but delay each re-send by an increasing amount.
654 * If the delay hits the maximum, start complaining.
663 for (ifctx = gctx->interfaces;
665 ifctx = ifctx->next) {
666 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
667 bootpc_tag(&gctx->tmptag, &ifctx->reply,
673 for (ifctx = gctx->interfaces;
675 ifctx = ifctx->next) {
676 ifctx->outstanding = 0;
677 if (bootpc_ifctx_isresolved(ifctx) != 0 &&
681 if (bootpc_ifctx_isfailed(ifctx) != 0)
685 ifctx->outstanding = 1;
687 /* Proceed to next step in DHCP negotiation */
688 if ((ifctx->state == IF_DHCP_OFFERED &&
689 ifctx->dhcpquerytype != DHCP_REQUEST) ||
690 (ifctx->state == IF_DHCP_UNRESOLVED &&
691 ifctx->dhcpquerytype != DHCP_DISCOVER) ||
692 (ifctx->state == IF_BOOTP_UNRESOLVED &&
693 ifctx->dhcpquerytype != DHCP_NOMSG)) {
695 bootpc_compose_query(ifctx, gctx, td);
698 /* Send BOOTP request (or re-send). */
700 if (ifctx->sentmsg == 0) {
701 switch(ifctx->dhcpquerytype) {
713 kprintf("Sending %s packet from "
714 "interface %s (%*D)\n",
716 ifctx->ireq.ifr_name,
717 ifctx->sdl->sdl_alen,
718 (unsigned char *) LLADDR(ifctx->sdl),
723 aio.iov_base = (caddr_t) &ifctx->call;
724 aio.iov_len = sizeof(ifctx->call);
728 auio.uio_segflg = UIO_SYSSPACE;
729 auio.uio_rw = UIO_WRITE;
731 auio.uio_resid = sizeof(ifctx->call);
734 /* Set netmask to 0.0.0.0 */
736 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
738 error = ifioctl(ifctx->so, SIOCSIFNETMASK,
739 (caddr_t) &ifctx->ireq, proc0.p_ucred);
742 "set if netmask, error=%d",
745 error = sosend(so, (struct sockaddr *) &dst,
746 &auio, NULL, NULL, 0, td);
748 kprintf("bootpc_call: sosend: %d state %08x\n",
749 error, (int) so->so_state);
752 /* XXX: Is this needed ? */
753 tsleep(&error, 0, "bootpw", 10);
755 /* Set netmask to 255.0.0.0 */
757 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
759 sin->sin_addr.s_addr = htonl(0xff000000u);
760 error = ifioctl(ifctx->so, SIOCSIFNETMASK,
761 (caddr_t) &ifctx->ireq, proc0.p_ucred);
764 "set if netmask, error=%d",
769 if (outstanding == 0 &&
770 (rtimo == 0 || time_second >= rtimo)) {
775 /* Determine new timeout. */
776 if (timo < MAX_RESEND_DELAY)
779 kprintf("DHCP/BOOTP timeout for server ");
780 print_sin_addr(&dst);
785 * Wait for up to timo seconds for a reply.
786 * The socket receive timeout was set to 1 second.
788 atimo = timo + time_second;
789 while (time_second < atimo) {
790 aio.iov_base = (caddr_t) &gctx->reply;
791 aio.iov_len = sizeof(gctx->reply);
795 auio.uio_segflg = UIO_SYSSPACE;
796 auio.uio_rw = UIO_READ;
798 auio.uio_resid = sizeof(gctx->reply);
802 error = soreceive(so, NULL, &auio,
803 NULL, NULL, &rcvflg);
804 gctx->secs = time_second - gctx->starttime;
805 for (ifctx = gctx->interfaces;
807 ifctx = ifctx->next) {
808 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
809 bootpc_ifctx_isfailed(ifctx) != 0)
812 ifctx->call.secs = htons(gctx->secs);
814 if (error == EWOULDBLOCK)
818 len = sizeof(gctx->reply) - auio.uio_resid;
820 /* Do we have the required number of bytes ? */
821 if (len < BOOTP_MIN_LEN)
823 gctx->replylen = len;
826 if (gctx->reply.op != BOOTP_REPLY)
829 /* Is this an answer to our query */
830 for (ifctx = gctx->interfaces;
832 ifctx = ifctx->next) {
833 if (gctx->reply.xid != ifctx->call.xid)
836 /* Same HW address size ? */
837 if (gctx->reply.hlen != ifctx->call.hlen)
840 /* Correct HW address ? */
841 if (bcmp(gctx->reply.chaddr,
843 ifctx->call.hlen) != 0)
850 s = bootpc_tag(&gctx->tmptag,
863 s = "DHCP (unexpected)";
869 kprintf("Received %s packet"
872 ifctx->ireq.ifr_name);
873 print_in_addr(gctx->reply.siaddr);
874 if (gctx->reply.giaddr.s_addr !=
877 print_in_addr(gctx->reply.giaddr);
879 if (bootpc_received(gctx, ifctx) != 0) {
880 kprintf(" (accepted)");
881 if (ifctx->outstanding) {
882 ifctx->outstanding = 0;
885 /* Network settle delay */
886 if (outstanding == 0)
887 atimo = time_second +
890 kprintf(" (ignored)");
891 if (ifctx->gotrootpath) {
893 rtimo = time_second +
895 kprintf(" (got root path)");
897 kprintf(" (no root path)");
902 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
905 /* Force a retry if halfway in DHCP negotiation */
907 for (ifctx = gctx->interfaces; ifctx != NULL;
908 ifctx = ifctx->next) {
909 if (ifctx->state == IF_DHCP_OFFERED) {
910 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
913 ifctx->state = IF_DHCP_UNRESOLVED;
920 if (gotrootpath != 0) {
921 gctx->gotrootpath = gotrootpath;
922 if (rtimo != 0 && time_second >= rtimo)
925 } /* forever send/receive */
928 * XXX: These are errors of varying seriousness being silently
932 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
933 if (bootpc_ifctx_isresolved(ifctx) == 0) {
934 kprintf("%s timeout for interface %s\n",
935 ifctx->dhcpquerytype != DHCP_NOMSG ?
937 ifctx->ireq.ifr_name);
940 if (gctx->gotrootpath != 0) {
942 kprintf("Got a root path, ignoring remaining timeout\n");
947 #ifndef BOOTP_NFSROOT
948 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
949 if (bootpc_ifctx_isresolved(ifctx) != 0) {
960 soclose(so, FNONBLOCK);
966 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
967 struct bootpc_globalcontext *gctx,
970 struct sockaddr_in *sin;
976 struct sockaddr_dl *sdl;
978 error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
980 panic("nfs_boot: socreate, error=%d", error);
986 * Bring up the interface.
988 * Get the old interface flags and or IFF_UP into them; if
989 * IFF_UP set blindly, interface selection can be clobbered.
991 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
993 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
994 ireq->ifr_flags |= IFF_UP;
995 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
997 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1000 * Do enough of ifconfig(8) so that the chosen interface
1001 * can talk to the servers. (just set the address)
1004 /* addr is 0.0.0.0 */
1006 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1008 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1009 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1010 panic("bootpc_fakeup_interface: "
1011 "set if addr, error=%d", error);
1013 /* netmask is 255.0.0.0 */
1015 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1017 sin->sin_addr.s_addr = htonl(0xff000000u);
1018 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
1020 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1023 /* Broadcast is 255.255.255.255 */
1025 sin = (struct sockaddr_in *)&ireq->ifr_addr;
1027 clear_sinaddr(&ifctx->broadcast);
1028 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1029 ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1031 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
1032 if (error != 0 && error != EADDRNOTAVAIL)
1033 panic("bootpc_fakeup_interface: "
1034 "set if broadcast addr, error=%d",
1038 /* Get HW address */
1041 TAILQ_FOREACH(ifa, &ifctx->ifp->if_addrhead, ifa_link)
1042 if (ifa->ifa_addr->sa_family == AF_LINK &&
1043 (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1044 sdl->sdl_type == IFT_ETHER)
1048 panic("bootpc: Unable to find HW address for %s",
1049 ifctx->ireq.ifr_name);
1057 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1058 struct bootpc_globalcontext *gctx,
1062 struct sockaddr_in defdst;
1063 struct sockaddr_in defmask;
1064 struct sockaddr_in *sin;
1068 struct sockaddr_in *myaddr;
1069 struct sockaddr_in *netmask;
1070 struct sockaddr_in *gw;
1072 ireq = &ifctx->ireq;
1074 myaddr = &ifctx->myaddr;
1075 netmask = &ifctx->netmask;
1078 if (bootpc_ifctx_isresolved(ifctx) == 0) {
1080 /* Shutdown interfaces where BOOTP failed */
1082 kprintf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1083 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1085 panic("bootpc_adjust_interface: "
1086 "SIOCGIFFLAGS, error=%d", error);
1087 ireq->ifr_flags &= ~IFF_UP;
1088 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1090 panic("bootpc_adjust_interface: "
1091 "SIOCSIFFLAGS, error=%d", error);
1093 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1095 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
1096 if (error != 0 && (error != EADDRNOTAVAIL ||
1097 ifctx == gctx->interfaces))
1098 panic("bootpc_adjust_interface: "
1099 "SIOCDIFADDR, error=%d", error);
1104 kprintf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1106 * Do enough of ifconfig(8) so that the chosen interface
1107 * can talk to the servers. (just set the address)
1109 bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1110 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
1112 panic("bootpc_adjust_interface: "
1113 "set if netmask, error=%d", error);
1115 /* Broadcast is with host part of IP address all 1's */
1117 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1119 sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1120 ~ netmask->sin_addr.s_addr;
1121 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
1123 panic("bootpc_adjust_interface: "
1124 "set if broadcast addr, error=%d", error);
1126 bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1127 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1128 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1129 panic("bootpc_adjust_interface: "
1130 "set if addr, error=%d", error);
1132 /* Add new default route */
1134 if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1135 clear_sinaddr(&defdst);
1136 clear_sinaddr(&defmask);
1137 error = rtrequest_global(RTM_ADD, (struct sockaddr *) &defdst,
1138 (struct sockaddr *) gw,
1139 (struct sockaddr *) &defmask,
1140 (RTF_UP | RTF_GATEWAY | RTF_STATIC));
1142 kprintf("bootpc_adjust_interface: "
1143 "add net route, error=%d\n", error);
1152 print_sin_addr(struct sockaddr_in *sin)
1154 print_in_addr(sin->sin_addr);
1159 print_in_addr(struct in_addr addr)
1163 ip = ntohl(addr.s_addr);
1164 kprintf("%d.%d.%d.%d",
1165 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1169 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1170 struct bootpc_globalcontext *gctx, struct thread *td)
1172 unsigned char *vendp;
1173 unsigned char vendor_client[64];
1175 uint8_t vendor_client_len;
1177 ifctx->gotrootpath = 0;
1179 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1182 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */
1183 ifctx->call.htype = 1; /* 10mb ethernet */
1184 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1185 ifctx->call.hops = 0;
1186 if (bootpc_ifctx_isunresolved(ifctx) != 0)
1188 ifctx->call.xid = txdr_unsigned(ifctx->xid);
1189 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1191 vendp = ifctx->call.vend;
1192 *vendp++ = 99; /* RFC1048 cookie */
1196 *vendp++ = TAG_MAXMSGSIZE;
1198 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1199 *vendp++ = sizeof(struct bootp_packet) & 255;
1201 ksnprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1202 ostype, MACHINE, osrelease);
1203 vendor_client_len = strlen(vendor_client);
1204 *vendp++ = TAG_VENDOR_INDENTIFIER;
1205 *vendp++ = vendor_client_len;
1206 memcpy(vendp, vendor_client, vendor_client_len);
1207 vendp += vendor_client_len;
1208 ifctx->dhcpquerytype = DHCP_NOMSG;
1209 switch (ifctx->state) {
1210 case IF_DHCP_UNRESOLVED:
1211 *vendp++ = TAG_DHCP_MSGTYPE;
1213 *vendp++ = DHCP_DISCOVER;
1214 ifctx->dhcpquerytype = DHCP_DISCOVER;
1215 ifctx->gotdhcpserver = 0;
1217 case IF_DHCP_OFFERED:
1218 *vendp++ = TAG_DHCP_MSGTYPE;
1220 *vendp++ = DHCP_REQUEST;
1221 ifctx->dhcpquerytype = DHCP_REQUEST;
1222 *vendp++ = TAG_DHCP_REQ_ADDR;
1224 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1226 if (ifctx->gotdhcpserver != 0) {
1227 *vendp++ = TAG_DHCP_SERVERID;
1229 memcpy(vendp, &ifctx->dhcpserver, 4);
1232 *vendp++ = TAG_DHCP_LEASETIME;
1234 leasetime = htonl(300);
1235 memcpy(vendp, &leasetime, 4);
1242 ifctx->call.secs = 0;
1243 ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1248 bootpc_hascookie(struct bootp_packet *bp)
1250 return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1251 bp->vend[2] == 83 && bp->vend[3] == 99);
1256 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1257 unsigned char *start, int len, int tag)
1263 if (tctx->badtag != 0 || tctx->badopt != 0)
1271 if (code == TAG_PAD)
1273 if (code == TAG_END)
1275 if (j >= ej || j + *j + 1 > ej) {
1281 if (tctx->taglen + len > TAG_MAXLEN) {
1287 memcpy(tctx->buf + tctx->taglen,
1289 tctx->taglen += len;
1291 if (code == TAG_OVERLOAD)
1292 tctx->overload = *j;
1299 static unsigned char *
1300 bootpc_tag(struct bootpc_tagcontext *tctx, struct bootp_packet *bp,
1312 if (bootpc_hascookie(bp) == 0)
1316 ej = (unsigned char *) bp + len;
1318 bootpc_tag_helper(tctx, &bp->vend[4],
1319 (unsigned char *) bp + len - &bp->vend[4], tag);
1321 if ((tctx->overload & OVERLOAD_FILE) != 0)
1322 bootpc_tag_helper(tctx,
1323 (unsigned char *) bp->file,
1326 if ((tctx->overload & OVERLOAD_SNAME) != 0)
1327 bootpc_tag_helper(tctx,
1328 (unsigned char *) bp->sname,
1332 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1334 tctx->buf[tctx->taglen] = '\0';
1340 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1341 struct bootpc_globalcontext *gctx)
1347 ifctx->gotnetmask = 0;
1349 clear_sinaddr(&ifctx->myaddr);
1350 clear_sinaddr(&ifctx->netmask);
1351 clear_sinaddr(&ifctx->gw);
1353 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1355 ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1356 ksnprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1358 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1360 kprintf("%s at ", ifctx->ireq.ifr_name);
1361 print_sin_addr(&ifctx->myaddr);
1362 kprintf(" server ");
1363 print_in_addr(ifctx->reply.siaddr);
1365 ifctx->gw.sin_addr = ifctx->reply.giaddr;
1366 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1367 kprintf(" via gateway ");
1368 print_in_addr(ifctx->reply.giaddr);
1371 /* This call used for the side effect (overload flag) */
1372 (void) bootpc_tag(&gctx->tmptag,
1373 &ifctx->reply, ifctx->replylen, TAG_END);
1375 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1376 if (ifctx->reply.sname[0] != '\0')
1377 kprintf(" server name %s", ifctx->reply.sname);
1378 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1379 if (ifctx->reply.file[0] != '\0')
1380 kprintf(" boot file %s", ifctx->reply.file);
1384 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1387 if (gctx->tag.taglen != 4)
1388 panic("bootpc: subnet mask len is %d",
1390 bcopy(p, &ifctx->netmask.sin_addr, 4);
1391 ifctx->gotnetmask = 1;
1392 kprintf("subnet mask ");
1393 print_sin_addr(&ifctx->netmask);
1397 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1401 if (gctx->tag.taglen % 4)
1402 panic("bootpc: Router Len is %d", gctx->tag.taglen);
1403 if (gctx->tag.taglen > 0) {
1404 bcopy(p, &ifctx->gw.sin_addr, 4);
1406 print_sin_addr(&ifctx->gw);
1413 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1416 if (gctx->setrootfs != NULL) {
1417 kprintf("rootfs %s (ignored) ", p);
1418 } else if (setfs(&nd->root_saddr,
1419 nd->root_hostnam, p)) {
1420 kprintf("rootfs %s ",p);
1421 gctx->gotrootpath = 1;
1422 ifctx->gotrootpath = 1;
1423 gctx->setrootfs = ifctx;
1425 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1429 mountopts(&nd->root_args, p);
1430 kprintf("rootopts %s ", p);
1433 panic("Failed to set rootfs to %s",p);
1436 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1439 if (gctx->setswapfs != NULL) {
1440 kprintf("swapfs %s (ignored) ", p);
1441 } else if (setfs(&nd->swap_saddr,
1442 nd->swap_hostnam, p)) {
1443 gctx->gotswappath = 1;
1444 gctx->setswapfs = ifctx;
1445 kprintf("swapfs %s ", p);
1447 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1451 /* swap mount options */
1452 mountopts(&nd->swap_args, p);
1453 kprintf("swapopts %s ", p);
1456 p = bootpc_tag(&gctx->tag, &ifctx->reply,
1461 if (gctx->tag.taglen != 4)
1463 "Expected 4 bytes for swaplen, "
1466 bcopy(p, &swaplen, 4);
1467 nd->swap_nblks = ntohl(swaplen);
1468 kprintf("swapsize %d KB ",
1472 panic("Failed to set swapfs to %s", p);
1475 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1478 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1479 panic("bootpc: hostname >= %d bytes",
1481 if (gctx->sethostname != NULL) {
1482 kprintf("hostname %s (ignored) ", p);
1484 strcpy(nd->my_hostnam, p);
1485 strcpy(hostname, p);
1486 kprintf("hostname %s ",hostname);
1487 gctx->sethostname = ifctx;
1490 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1492 if (p != NULL) { /* store in a sysctl variable */
1493 int i, l = sizeof(bootp_cookie) - 1;
1494 for (i = 0; i < l && p[i] != '\0'; i++)
1495 bootp_cookie[i] = p[i];
1501 if (ifctx->gotnetmask == 0) {
1502 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1503 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1504 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1505 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1507 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1509 if (ifctx->gotgw == 0) {
1511 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1518 struct bootpc_ifcontext *ifctx, *nctx; /* Interface BOOTP contexts */
1519 struct bootpc_globalcontext *gctx; /* Global BOOTP context */
1522 struct nfsv3_diskless *nd;
1525 nd = &nfsv3_diskless;
1529 * If already filled in, don't touch it here
1531 if (nfs_diskless_valid != 0)
1535 * Wait until arp entries can be handled.
1537 while (time_second == 0)
1538 tsleep(&time_second, 0, "arpkludge", 10);
1540 gctx = kmalloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1542 gctx->xid = ~0xFFFF;
1543 gctx->starttime = time_second;
1545 ifctx = allocifctx(gctx);
1548 * Find a network interface.
1550 #ifdef BOOTP_WIRED_TO
1551 kprintf("bootpc_init: wired to interface '%s'\n",
1552 __XSTRING(BOOTP_WIRED_TO));
1554 bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1555 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1556 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1557 sizeof(ifctx->ireq.ifr_name));
1558 #ifdef BOOTP_WIRED_TO
1559 if (strcmp(ifctx->ireq.ifr_name,
1560 __XSTRING(BOOTP_WIRED_TO)) != 0)
1563 if ((ifp->if_flags &
1564 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1568 if (gctx->interfaces != NULL)
1569 gctx->lastinterface->next = ifctx;
1571 gctx->interfaces = ifctx;
1573 gctx->lastinterface = ifctx;
1574 ifctx = allocifctx(gctx);
1576 kfree(ifctx, M_TEMP);
1578 if (gctx->interfaces == NULL) {
1579 #ifdef BOOTP_WIRED_TO
1580 panic("bootpc_init: Could not find interface specified "
1581 "by BOOTP_WIRED_TO: "
1582 __XSTRING(BOOTP_WIRED_TO));
1584 panic("bootpc_init: no suitable interface");
1588 gctx->gotrootpath = 0;
1589 gctx->gotswappath = 0;
1592 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1593 bootpc_fakeup_interface(ifctx, gctx, td);
1595 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1596 bootpc_compose_query(ifctx, gctx, td);
1598 ifctx = gctx->interfaces;
1599 error = bootpc_call(gctx, td);
1602 #ifdef BOOTP_NFSROOT
1603 panic("BOOTP call failed");
1605 kprintf("BOOTP call failed\n");
1609 mountopts(&nd->root_args, NULL);
1611 mountopts(&nd->swap_args, NULL);
1613 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1614 if (bootpc_ifctx_isresolved(ifctx) != 0)
1615 bootpc_decode_reply(nd, ifctx, gctx);
1617 if (gctx->gotswappath == 0)
1619 #ifdef BOOTP_NFSROOT
1620 if (gctx->gotrootpath == 0)
1621 panic("bootpc: No root path offered");
1624 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1625 bootpc_adjust_interface(ifctx, gctx, td);
1627 soclose(ifctx->so, FNONBLOCK);
1630 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1631 if (ifctx->gotrootpath != 0)
1633 if (ifctx == NULL) {
1634 for (ifctx = gctx->interfaces;
1636 ifctx = ifctx->next)
1637 if (bootpc_ifctx_isresolved(ifctx) != 0)
1643 if (gctx->gotrootpath != 0) {
1645 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1646 nd->root_fh, &nd->root_fhsize,
1647 &nd->root_args, td);
1649 panic("nfs_boot: mountd root, error=%d", error);
1651 if (gctx->gotswappath != 0) {
1653 error = md_mount(&nd->swap_saddr,
1655 nd->swap_fh, &nd->swap_fhsize,
1656 &nd->swap_args, td);
1658 panic("nfs_boot: mountd swap, error=%d",
1661 error = md_lookup_swap(&nd->swap_saddr,
1663 nd->swap_fh, &nd->swap_fhsize,
1664 &nd->swap_args, td);
1666 panic("nfs_boot: lookup swap, error=%d",
1669 nfs_diskless_valid = 3;
1672 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1673 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1674 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1675 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1676 ifctx->myaddr.sin_addr.s_addr |
1677 ~ ifctx->netmask.sin_addr.s_addr;
1678 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1681 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1683 kfree(ifctx, M_TEMP);
1685 kfree(gctx, M_TEMP);