1 | /* $NetBSD: nfs_boot.c,v 1.87 2016/11/15 01:50:06 ozaki-r Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 1995, 1997 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Adam Glass and Gordon W. Ross. |
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 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
29 | * POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | /* |
33 | * Support for NFS diskless booting, specifically getting information |
34 | * about where to mount root from, what pathnames, etc. |
35 | */ |
36 | |
37 | #include <sys/cdefs.h> |
38 | __KERNEL_RCSID(0, "$NetBSD: nfs_boot.c,v 1.87 2016/11/15 01:50:06 ozaki-r Exp $" ); |
39 | |
40 | #ifdef _KERNEL_OPT |
41 | #include "opt_nfs.h" |
42 | #include "opt_tftproot.h" |
43 | #include "opt_nfs_boot.h" |
44 | #endif |
45 | |
46 | #include <sys/param.h> |
47 | #include <sys/systm.h> |
48 | #include <sys/kernel.h> |
49 | #include <sys/device.h> |
50 | #include <sys/ioctl.h> |
51 | #include <sys/proc.h> |
52 | #include <sys/mount.h> |
53 | #include <sys/mbuf.h> |
54 | #include <sys/reboot.h> |
55 | #include <sys/socket.h> |
56 | #include <sys/socketvar.h> |
57 | |
58 | #include <net/if.h> |
59 | #include <net/route.h> |
60 | #include <net/if_ether.h> |
61 | #include <net/if_types.h> |
62 | |
63 | #include <netinet/in.h> |
64 | #include <netinet/if_inarp.h> |
65 | |
66 | #include <nfs/rpcv2.h> |
67 | #include <nfs/krpc.h> |
68 | #include <nfs/xdr_subs.h> |
69 | |
70 | #include <nfs/nfsproto.h> |
71 | #include <nfs/nfs.h> |
72 | #include <nfs/nfsmount.h> |
73 | #include <nfs/nfsdiskless.h> |
74 | |
75 | /* |
76 | * There are three implementations of NFS diskless boot. |
77 | * One implementation uses BOOTP (RFC951, RFC1048), |
78 | * Sun RPC/bootparams or static configuration. See the |
79 | * files: |
80 | * nfs_bootdhcp.c: BOOTP (RFC951, RFC1048) |
81 | * nfs_bootparam.c: Sun RPC/bootparams |
82 | * nfs_bootstatic.c: honour config(1) description |
83 | */ |
84 | #if defined(NFS_BOOT_BOOTP) || defined(NFS_BOOT_DHCP) |
85 | int nfs_boot_rfc951 = 1; /* BOOTP enabled (default) */ |
86 | #endif |
87 | #ifdef NFS_BOOT_BOOTPARAM |
88 | int nfs_boot_bootparam = 1; /* BOOTPARAM enabled (default) */ |
89 | #endif |
90 | #ifdef NFS_BOOT_BOOTSTATIC |
91 | int nfs_boot_bootstatic = 1; /* BOOTSTATIC enabled (default) */ |
92 | #endif |
93 | |
94 | #define IP_MIN_MTU 576 |
95 | |
96 | /* mountd RPC */ |
97 | static int md_mount(struct sockaddr_in *mdsin, char *path, |
98 | struct nfs_args *argp, struct lwp *l); |
99 | |
100 | static int nfs_boot_delroute_matcher(struct rtentry *, void *); |
101 | static void nfs_boot_defrt(struct in_addr *); |
102 | static int nfs_boot_getfh(struct nfs_dlmount *ndm, struct lwp *); |
103 | |
104 | |
105 | /* |
106 | * Called with an empty nfs_diskless struct to be filled in. |
107 | * Find an interface, determine its ip address (etc.) and |
108 | * save all the boot parameters in the nfs_diskless struct. |
109 | */ |
110 | int |
111 | nfs_boot_init(struct nfs_diskless *nd, struct lwp *lwp) |
112 | { |
113 | struct ifnet *ifp; |
114 | int error = 0; |
115 | int flags __unused; |
116 | |
117 | /* Explicitly necessary or build fails |
118 | * due to unused variable, otherwise. |
119 | */ |
120 | flags = 0; |
121 | |
122 | /* |
123 | * Find the network interface. |
124 | */ |
125 | ifp = ifunit(device_xname(root_device)); |
126 | if (ifp == NULL) { |
127 | printf("nfs_boot: '%s' not found\n" , |
128 | device_xname(root_device)); |
129 | return (ENXIO); |
130 | } |
131 | nd->nd_ifp = ifp; |
132 | |
133 | error = EADDRNOTAVAIL; /* ??? */ |
134 | #if defined(NFS_BOOT_BOOTSTATIC) |
135 | if (error && nfs_boot_bootstatic) { |
136 | printf("nfs_boot: trying static\n" ); |
137 | error = nfs_bootstatic(nd, lwp, &flags); |
138 | } |
139 | #endif |
140 | #if defined(NFS_BOOT_BOOTP) || defined(NFS_BOOT_DHCP) |
141 | if (error && nfs_boot_rfc951) { |
142 | #if defined(NFS_BOOT_DHCP) |
143 | printf("nfs_boot: trying DHCP/BOOTP\n" ); |
144 | #else |
145 | printf("nfs_boot: trying BOOTP\n" ); |
146 | #endif |
147 | error = nfs_bootdhcp(nd, lwp, &flags); |
148 | } |
149 | #endif |
150 | #ifdef NFS_BOOT_BOOTPARAM |
151 | if (error && nfs_boot_bootparam) { |
152 | printf("nfs_boot: trying RARP (and RPC/bootparam)\n" ); |
153 | error = nfs_bootparam(nd, lwp, &flags); |
154 | } |
155 | #endif |
156 | if (error) |
157 | return (error); |
158 | |
159 | /* |
160 | * Set MTU if passed |
161 | */ |
162 | if (nd->nd_mtu >= IP_MIN_MTU ) |
163 | nfs_boot_setmtu(nd->nd_ifp, nd->nd_mtu, lwp); |
164 | |
165 | /* |
166 | * If the gateway address is set, add a default route. |
167 | * (The mountd RPCs may go across a gateway.) |
168 | */ |
169 | if (nd->nd_gwip.s_addr) |
170 | nfs_boot_defrt(&nd->nd_gwip); |
171 | |
172 | #ifdef TFTPROOT |
173 | if (nd->nd_nomount) |
174 | goto out; |
175 | #endif |
176 | /* |
177 | * Now fetch the NFS file handles as appropriate. |
178 | */ |
179 | error = nfs_boot_getfh(&nd->nd_root, lwp); |
180 | |
181 | if (error) |
182 | nfs_boot_cleanup(nd, lwp); |
183 | |
184 | #ifdef TFTPROOT |
185 | out: |
186 | #endif |
187 | return (error); |
188 | } |
189 | |
190 | void |
191 | nfs_boot_cleanup(struct nfs_diskless *nd, struct lwp *lwp) |
192 | { |
193 | |
194 | nfs_boot_deladdress(nd->nd_ifp, lwp, nd->nd_myip.s_addr); |
195 | nfs_boot_ifupdown(nd->nd_ifp, lwp, 0); |
196 | nfs_boot_flushrt(nd->nd_ifp); |
197 | } |
198 | |
199 | int |
200 | nfs_boot_ifupdown(struct ifnet *ifp, struct lwp *lwp, int up) |
201 | { |
202 | struct socket *so; |
203 | struct ifreq ireq; |
204 | int error; |
205 | |
206 | memset(&ireq, 0, sizeof(ireq)); |
207 | memcpy(ireq.ifr_name, ifp->if_xname, IFNAMSIZ); |
208 | |
209 | /* |
210 | * Get a socket to use for various things in here. |
211 | * After this, use "goto out" to cleanup and return. |
212 | */ |
213 | error = socreate(AF_INET, &so, SOCK_DGRAM, 0, lwp, NULL); |
214 | if (error) { |
215 | printf("ifupdown: socreate, error=%d\n" , error); |
216 | return (error); |
217 | } |
218 | |
219 | /* |
220 | * Bring up the interface. (just set the "up" flag) |
221 | * Get the old interface flags and or IFF_UP into them so |
222 | * things like media selection flags are not clobbered. |
223 | */ |
224 | error = ifioctl(so, SIOCGIFFLAGS, (void *)&ireq, lwp); |
225 | if (error) { |
226 | printf("ifupdown: GIFFLAGS, error=%d\n" , error); |
227 | goto out; |
228 | } |
229 | if (up) |
230 | ireq.ifr_flags |= IFF_UP; |
231 | else |
232 | ireq.ifr_flags &= ~IFF_UP; |
233 | error = ifioctl(so, SIOCSIFFLAGS, &ireq, lwp); |
234 | if (error) { |
235 | printf("ifupdown: SIFFLAGS, error=%d\n" , error); |
236 | goto out; |
237 | } |
238 | |
239 | if (up) |
240 | /* give the link some time to get up */ |
241 | tsleep(nfs_boot_ifupdown, PZERO, "nfsbif" , 3 * hz); |
242 | out: |
243 | soclose(so); |
244 | return (error); |
245 | } |
246 | |
247 | void |
248 | nfs_boot_setmtu(struct ifnet *ifp, int mtu, struct lwp *lwp) |
249 | { |
250 | struct socket *so; |
251 | struct ifreq ireq; |
252 | int error; |
253 | |
254 | memset(&ireq, 0, sizeof(ireq)); |
255 | memcpy(ireq.ifr_name, ifp->if_xname, IFNAMSIZ); |
256 | |
257 | /* |
258 | * Get a socket to use for various things in here. |
259 | * After this, use "goto out" to cleanup and return. |
260 | */ |
261 | error = socreate(AF_INET, &so, SOCK_DGRAM, 0, lwp, NULL); |
262 | if (error) { |
263 | printf("setmtu: socreate, error=%d\n" , error); |
264 | return; |
265 | } |
266 | |
267 | /* |
268 | * Get structure, set the new MTU, push structure. |
269 | */ |
270 | error = ifioctl(so, SIOCGIFMTU, (void *)&ireq, lwp); |
271 | if (error) { |
272 | printf("setmtu: GIFMTU, error=%d\n" , error); |
273 | goto out; |
274 | } |
275 | |
276 | ireq.ifr_mtu = mtu; |
277 | |
278 | error = ifioctl(so, SIOCSIFMTU, &ireq, lwp); |
279 | if (error) { |
280 | printf("setmtu: SIFMTU, error=%d\n" , error); |
281 | goto out; |
282 | } |
283 | |
284 | out: |
285 | soclose(so); |
286 | return; |
287 | } |
288 | |
289 | int |
290 | nfs_boot_setaddress(struct ifnet *ifp, struct lwp *lwp, |
291 | uint32_t addr, uint32_t netmask, uint32_t braddr) |
292 | { |
293 | struct socket *so; |
294 | struct ifaliasreq iareq; |
295 | struct sockaddr_in *sin; |
296 | int error; |
297 | |
298 | /* |
299 | * Get a socket to use for various things in here. |
300 | * After this, use "goto out" to cleanup and return. |
301 | */ |
302 | error = socreate(AF_INET, &so, SOCK_DGRAM, 0, lwp, NULL); |
303 | if (error) { |
304 | printf("setaddress: socreate, error=%d\n" , error); |
305 | return (error); |
306 | } |
307 | |
308 | memset(&iareq, 0, sizeof(iareq)); |
309 | memcpy(iareq.ifra_name, ifp->if_xname, IFNAMSIZ); |
310 | |
311 | /* Set the I/F address */ |
312 | sin = (struct sockaddr_in *)&iareq.ifra_addr; |
313 | sin->sin_len = sizeof(*sin); |
314 | sin->sin_family = AF_INET; |
315 | sin->sin_addr.s_addr = addr; |
316 | |
317 | /* Set the netmask */ |
318 | if (netmask != INADDR_ANY) { |
319 | sin = (struct sockaddr_in *)&iareq.ifra_mask; |
320 | sin->sin_len = sizeof(*sin); |
321 | sin->sin_family = AF_INET; |
322 | sin->sin_addr.s_addr = netmask; |
323 | } /* else leave subnetmask unspecified (len=0) */ |
324 | |
325 | /* Set the broadcast addr. */ |
326 | if (braddr != INADDR_ANY) { |
327 | sin = (struct sockaddr_in *)&iareq.ifra_broadaddr; |
328 | sin->sin_len = sizeof(*sin); |
329 | sin->sin_family = AF_INET; |
330 | sin->sin_addr.s_addr = braddr; |
331 | } /* else leave broadcast addr unspecified (len=0) */ |
332 | |
333 | error = ifioctl(so, SIOCAIFADDR, (void *)&iareq, lwp); |
334 | if (error) { |
335 | printf("setaddress, error=%d\n" , error); |
336 | goto out; |
337 | } |
338 | |
339 | /* give the link some time to get up */ |
340 | tsleep(nfs_boot_setaddress, PZERO, "nfsbtd" , 3 * hz); |
341 | out: |
342 | soclose(so); |
343 | return (error); |
344 | } |
345 | |
346 | int |
347 | nfs_boot_deladdress(struct ifnet *ifp, struct lwp *lwp, uint32_t addr) |
348 | { |
349 | struct socket *so; |
350 | struct ifreq ifr; |
351 | struct sockaddr_in sin; |
352 | struct in_addr ia = {.s_addr = addr}; |
353 | int error; |
354 | |
355 | /* |
356 | * Get a socket to use for various things in here. |
357 | * After this, use "goto out" to cleanup and return. |
358 | */ |
359 | error = socreate(AF_INET, &so, SOCK_DGRAM, 0, lwp, NULL); |
360 | if (error) { |
361 | printf("deladdress: socreate, error=%d\n" , error); |
362 | return (error); |
363 | } |
364 | |
365 | memset(&ifr, 0, sizeof(ifr)); |
366 | memcpy(ifr.ifr_name, ifp->if_xname, IFNAMSIZ); |
367 | |
368 | sockaddr_in_init(&sin, &ia, 0); |
369 | ifreq_setaddr(SIOCDIFADDR, &ifr, sintocsa(&sin)); |
370 | |
371 | error = ifioctl(so, SIOCDIFADDR, &ifr, lwp); |
372 | if (error) { |
373 | printf("deladdress, error=%d\n" , error); |
374 | goto out; |
375 | } |
376 | |
377 | out: |
378 | soclose(so); |
379 | return (error); |
380 | } |
381 | |
382 | int |
383 | nfs_boot_setrecvtimo(struct socket *so) |
384 | { |
385 | struct timeval tv; |
386 | |
387 | tv.tv_sec = 1; |
388 | tv.tv_usec = 0; |
389 | |
390 | return (so_setsockopt(NULL, so, SOL_SOCKET, SO_RCVTIMEO, &tv, |
391 | sizeof(tv))); |
392 | } |
393 | |
394 | int |
395 | nfs_boot_enbroadcast(struct socket *so) |
396 | { |
397 | int32_t on; |
398 | |
399 | on = 1; |
400 | return (so_setsockopt(NULL, so, SOL_SOCKET, SO_BROADCAST, &on, |
401 | sizeof(on))); |
402 | } |
403 | |
404 | int |
405 | nfs_boot_sobind_ipport(struct socket *so, uint16_t port, struct lwp *l) |
406 | { |
407 | struct sockaddr_in sin; |
408 | int error; |
409 | |
410 | sin.sin_len = sizeof(sin); |
411 | sin.sin_family = AF_INET; |
412 | sin.sin_addr.s_addr = INADDR_ANY; |
413 | sin.sin_port = htons(port); |
414 | error = sobind(so, (struct sockaddr *)&sin, l); |
415 | return (error); |
416 | } |
417 | |
418 | /* |
419 | * What is the longest we will wait before re-sending a request? |
420 | * Note this is also the frequency of "timeout" messages. |
421 | * The re-send loop counts up linearly to this maximum, so the |
422 | * first complaint will happen after (1+2+3+4+5)=15 seconds. |
423 | */ |
424 | #define MAX_RESEND_DELAY 5 /* seconds */ |
425 | #define TOTAL_TIMEOUT 30 /* seconds */ |
426 | |
427 | int |
428 | nfs_boot_sendrecv(struct socket *so, struct sockaddr_in *nam, |
429 | int (*sndproc)(struct mbuf *, void *, int), |
430 | struct mbuf *snd, |
431 | int (*rcvproc)(struct mbuf **, void *), |
432 | struct mbuf **rcv, struct mbuf **from_p, |
433 | void *context, struct lwp *lwp) |
434 | { |
435 | int error, rcvflg, timo, secs, waited; |
436 | struct mbuf *m, *from; |
437 | struct uio uio; |
438 | |
439 | /* Free at end if not null. */ |
440 | from = NULL; |
441 | |
442 | /* |
443 | * Send it, repeatedly, until a reply is received, |
444 | * but delay each re-send by an increasing amount. |
445 | * If the delay hits the maximum, start complaining. |
446 | */ |
447 | waited = timo = 0; |
448 | send_again: |
449 | waited += timo; |
450 | if (waited >= TOTAL_TIMEOUT) |
451 | return (ETIMEDOUT); |
452 | |
453 | /* Determine new timeout. */ |
454 | if (timo < MAX_RESEND_DELAY) |
455 | timo++; |
456 | else |
457 | printf("nfs_boot: timeout...\n" ); |
458 | |
459 | if (sndproc) { |
460 | error = (*sndproc)(snd, context, waited); |
461 | if (error) |
462 | goto out; |
463 | } |
464 | |
465 | /* Send request (or re-send). */ |
466 | m = m_copypacket(snd, M_WAIT); |
467 | if (m == NULL) { |
468 | error = ENOBUFS; |
469 | goto out; |
470 | } |
471 | error = (*so->so_send)(so, (struct sockaddr *)nam, NULL, |
472 | m, NULL, 0, lwp); |
473 | if (error) { |
474 | printf("nfs_boot: sosend: %d\n" , error); |
475 | goto out; |
476 | } |
477 | m = NULL; |
478 | |
479 | /* |
480 | * Wait for up to timo seconds for a reply. |
481 | * The socket receive timeout was set to 1 second. |
482 | */ |
483 | |
484 | secs = timo; |
485 | for (;;) { |
486 | if (from) { |
487 | m_freem(from); |
488 | from = NULL; |
489 | } |
490 | if (m) { |
491 | m_freem(m); |
492 | m = NULL; |
493 | } |
494 | uio.uio_resid = 1 << 16; /* ??? */ |
495 | rcvflg = 0; |
496 | error = (*so->so_receive)(so, &from, &uio, &m, NULL, &rcvflg); |
497 | if (error == EWOULDBLOCK) { |
498 | if (--secs <= 0) |
499 | goto send_again; |
500 | continue; |
501 | } |
502 | if (error) |
503 | goto out; |
504 | #ifdef DIAGNOSTIC |
505 | if (!m || !(m->m_flags & M_PKTHDR) |
506 | || (1 << 16) - uio.uio_resid != m->m_pkthdr.len) |
507 | panic("nfs_boot_sendrecv: return size" ); |
508 | #endif |
509 | |
510 | if ((*rcvproc)(&m, context)) |
511 | continue; |
512 | |
513 | if (rcv) |
514 | *rcv = m; |
515 | else |
516 | m_freem(m); |
517 | if (from_p) { |
518 | *from_p = from; |
519 | from = NULL; |
520 | } |
521 | break; |
522 | } |
523 | out: |
524 | if (from) m_freem(from); |
525 | return (error); |
526 | } |
527 | |
528 | /* |
529 | * Install a default route to the passed IP address. |
530 | */ |
531 | static void |
532 | nfs_boot_defrt(struct in_addr *gw_ip) |
533 | { |
534 | struct sockaddr dst, gw, mask; |
535 | struct sockaddr_in *sin; |
536 | int error; |
537 | |
538 | /* Destination: (default) */ |
539 | memset((void *)&dst, 0, sizeof(dst)); |
540 | dst.sa_len = sizeof(dst); |
541 | dst.sa_family = AF_INET; |
542 | /* Gateway: */ |
543 | memset((void *)&gw, 0, sizeof(gw)); |
544 | sin = (struct sockaddr_in *)&gw; |
545 | sin->sin_len = sizeof(*sin); |
546 | sin->sin_family = AF_INET; |
547 | sin->sin_addr.s_addr = gw_ip->s_addr; |
548 | /* Mask: (zero length) */ |
549 | /* XXX - Just pass a null pointer? */ |
550 | memset(&mask, 0, sizeof(mask)); |
551 | |
552 | /* add, dest, gw, mask, flags, 0 */ |
553 | error = rtrequest(RTM_ADD, &dst, &gw, &mask, |
554 | (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL); |
555 | if (error) { |
556 | printf("nfs_boot: add route, error=%d\n" , error); |
557 | error = 0; |
558 | } |
559 | } |
560 | |
561 | static int |
562 | nfs_boot_delroute_matcher(struct rtentry *rt, void *w) |
563 | { |
564 | |
565 | if ((void *)rt->rt_ifp != w) |
566 | return 0; |
567 | |
568 | return 1; |
569 | } |
570 | |
571 | void |
572 | nfs_boot_flushrt(struct ifnet *ifp) |
573 | { |
574 | |
575 | rt_delete_matched_entries(AF_INET, nfs_boot_delroute_matcher, ifp); |
576 | } |
577 | |
578 | /* |
579 | * Get an initial NFS file handle using Sun RPC/mountd. |
580 | * Separate function because we used to call it twice. |
581 | * (once for root and once for swap) |
582 | * |
583 | * ndm output |
584 | */ |
585 | static int |
586 | nfs_boot_getfh(struct nfs_dlmount *ndm, struct lwp *l) |
587 | { |
588 | struct nfs_args *args; |
589 | struct sockaddr_in *sin; |
590 | char *pathname; |
591 | int error; |
592 | u_int16_t port; |
593 | |
594 | args = &ndm->ndm_args; |
595 | |
596 | /* Initialize mount args. */ |
597 | memset((void *) args, 0, sizeof(*args)); |
598 | args->addr = &ndm->ndm_saddr; |
599 | args->addrlen = args->addr->sa_len; |
600 | #ifdef NFS_BOOT_TCP |
601 | args->sotype = SOCK_STREAM; |
602 | #else |
603 | args->sotype = SOCK_DGRAM; |
604 | #endif |
605 | args->fh = ndm->ndm_fh; |
606 | args->hostname = ndm->ndm_host; |
607 | args->flags = NFSMNT_NOCONN | NFSMNT_RESVPORT; |
608 | |
609 | #ifndef NFS_V2_ONLY |
610 | args->flags |= NFSMNT_NFSV3; |
611 | #endif |
612 | #ifdef NFS_BOOT_OPTIONS |
613 | args->flags |= NFS_BOOT_OPTIONS; |
614 | #endif |
615 | #ifdef NFS_BOOT_RWSIZE |
616 | /* |
617 | * Reduce rsize,wsize for interfaces that consistently |
618 | * drop fragments of long UDP messages. (i.e. wd8003). |
619 | * You can always change these later via remount. |
620 | */ |
621 | args->flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; |
622 | args->wsize = NFS_BOOT_RWSIZE; |
623 | args->rsize = NFS_BOOT_RWSIZE; |
624 | #endif |
625 | |
626 | /* |
627 | * Find the pathname part of the "server:pathname" |
628 | * string left in ndm->ndm_host by nfs_boot_init. |
629 | */ |
630 | pathname = strchr(ndm->ndm_host, ':'); |
631 | if (pathname == 0) { |
632 | printf("nfs_boot: getfh - no pathname\n" ); |
633 | return (EIO); |
634 | } |
635 | pathname++; |
636 | |
637 | /* |
638 | * Get file handle using RPC to mountd/mount |
639 | */ |
640 | sin = (struct sockaddr_in *)&ndm->ndm_saddr; |
641 | error = md_mount(sin, pathname, args, l); |
642 | if (error) { |
643 | printf("nfs_boot: mountd `%s', error=%d\n" , |
644 | ndm->ndm_host, error); |
645 | return (error); |
646 | } |
647 | |
648 | /* Set port number for NFS use. */ |
649 | /* XXX: NFS port is always 2049, right? */ |
650 | retry: |
651 | error = krpc_portmap(sin, NFS_PROG, |
652 | (args->flags & NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, |
653 | (args->sotype == SOCK_STREAM) ? IPPROTO_TCP : IPPROTO_UDP, |
654 | &port, l); |
655 | if (port == htons(0)) |
656 | error = EIO; |
657 | if (error) { |
658 | if (args->sotype == SOCK_STREAM) { |
659 | args->sotype = SOCK_DGRAM; |
660 | goto retry; |
661 | } |
662 | printf("nfs_boot: portmap NFS, error=%d\n" , error); |
663 | return (error); |
664 | } |
665 | sin->sin_port = port; |
666 | return (0); |
667 | } |
668 | |
669 | |
670 | /* |
671 | * RPC: mountd/mount |
672 | * Given a server pathname, get an NFS file handle. |
673 | * Also, sets sin->sin_port to the NFS service port. |
674 | * |
675 | * mdsin mountd server address |
676 | */ |
677 | static int |
678 | md_mount(struct sockaddr_in *mdsin, char *path, |
679 | struct nfs_args *argp, struct lwp *lwp) |
680 | { |
681 | /* The RPC structures */ |
682 | struct rdata { |
683 | u_int32_t errno; |
684 | union { |
685 | u_int8_t v2fh[NFSX_V2FH]; |
686 | struct { |
687 | u_int32_t fhlen; |
688 | u_int8_t fh[1]; |
689 | } v3fh; |
690 | } fh; |
691 | } *rdata; |
692 | struct mbuf *m; |
693 | u_int8_t *fh; |
694 | int minlen, error; |
695 | int mntver; |
696 | |
697 | mntver = (argp->flags & NFSMNT_NFSV3) ? 3 : 2; |
698 | do { |
699 | /* |
700 | * Get port number for MOUNTD. |
701 | */ |
702 | error = krpc_portmap(mdsin, RPCPROG_MNT, mntver, |
703 | IPPROTO_UDP, &mdsin->sin_port, lwp); |
704 | if (error) |
705 | continue; |
706 | |
707 | /* This mbuf is consumed by krpc_call. */ |
708 | m = xdr_string_encode(path, strlen(path)); |
709 | if (m == NULL) |
710 | return ENOMEM; |
711 | |
712 | /* Do RPC to mountd. */ |
713 | error = krpc_call(mdsin, RPCPROG_MNT, mntver, |
714 | RPCMNT_MOUNT, &m, NULL, lwp); |
715 | if (error != EPROGMISMATCH) |
716 | break; |
717 | /* Try lower version of mountd. */ |
718 | } while (--mntver >= 1); |
719 | if (error) { |
720 | printf("nfs_boot: mountd error=%d\n" , error); |
721 | return error; |
722 | } |
723 | if (mntver != 3) |
724 | argp->flags &= ~NFSMNT_NFSV3; |
725 | |
726 | /* The reply might have only the errno. */ |
727 | if (m->m_len < 4) |
728 | goto bad; |
729 | /* Have at least errno, so check that. */ |
730 | rdata = mtod(m, struct rdata *); |
731 | error = fxdr_unsigned(u_int32_t, rdata->errno); |
732 | if (error) |
733 | goto out; |
734 | |
735 | /* Have errno==0, so the fh must be there. */ |
736 | if (mntver == 3) { |
737 | argp->fhsize = fxdr_unsigned(u_int32_t, rdata->fh.v3fh.fhlen); |
738 | if (argp->fhsize > NFSX_V3FHMAX) |
739 | goto bad; |
740 | minlen = 2 * sizeof(u_int32_t) + argp->fhsize; |
741 | } else { |
742 | argp->fhsize = NFSX_V2FH; |
743 | minlen = sizeof(u_int32_t) + argp->fhsize; |
744 | } |
745 | |
746 | if (m->m_len < minlen) { |
747 | m = m_pullup(m, minlen); |
748 | if (m == NULL) |
749 | return(EBADRPC); |
750 | rdata = mtod(m, struct rdata *); |
751 | } |
752 | |
753 | fh = (mntver == 3) ? |
754 | rdata->fh.v3fh.fh : rdata->fh.v2fh; |
755 | memcpy(argp->fh, fh, argp->fhsize); |
756 | |
757 | goto out; |
758 | |
759 | bad: |
760 | error = EBADRPC; |
761 | |
762 | out: |
763 | m_freem(m); |
764 | return error; |
765 | } |
766 | |