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rump.c revision 1.147 
      1 /*	$NetBSD: rump.c,v 1.147 2009/12/09 00:11:21 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2007 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Development of this software was supported by Google Summer of Code.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     18  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: rump.c,v 1.147 2009/12/09 00:11:21 pooka Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/atomic.h>
     35 #include <sys/buf.h>
     36 #include <sys/callout.h>
     37 #include <sys/conf.h>
     38 #include <sys/cpu.h>
     39 #include <sys/device.h>
     40 #include <sys/evcnt.h>
     41 #include <sys/event.h>
     42 #include <sys/exec_elf.h>
     43 #include <sys/filedesc.h>
     44 #include <sys/iostat.h>
     45 #include <sys/kauth.h>
     46 #include <sys/kernel.h>
     47 #include <sys/kmem.h>
     48 #include <sys/kprintf.h>
     49 #include <sys/ksyms.h>
     50 #include <sys/msgbuf.h>
     51 #include <sys/module.h>
     52 #include <sys/once.h>
     53 #include <sys/percpu.h>
     54 #include <sys/pipe.h>
     55 #include <sys/queue.h>
     56 #include <sys/reboot.h>
     57 #include <sys/resourcevar.h>
     58 #include <sys/select.h>
     59 #include <sys/sysctl.h>
     60 #include <sys/syscall.h>
     61 #include <sys/tty.h>
     62 #include <sys/uidinfo.h>
     63 #include <sys/vmem.h>
     64 #include <sys/xcall.h>
     65 
     66 #include <rump/rumpuser.h>
     67 
     68 #include <secmodel/suser/suser.h>
     69 
     70 #include <prop/proplib.h>
     71 
     72 #include <uvm/uvm_readahead.h>
     73 
     74 #include "rump_private.h"
     75 #include "rump_net_private.h"
     76 #include "rump_vfs_private.h"
     77 #include "rump_dev_private.h"
     78 
     79 struct proc proc0;
     80 struct session rump_session = {
     81 	.s_count = 1,
     82 	.s_flags = 0,
     83 	.s_leader = &proc0,
     84 	.s_login = "rumphobo",
     85 	.s_sid = 0,
     86 };
     87 struct pgrp rump_pgrp = {
     88 	.pg_members = LIST_HEAD_INITIALIZER(pg_members),
     89 	.pg_session = &rump_session,
     90 	.pg_jobc = 1,
     91 };
     92 struct pstats rump_stats;
     93 struct plimit rump_limits;
     94 struct filedesc rump_filedesc0;
     95 struct proclist allproc;
     96 char machine[] = "rump";
     97 static kauth_cred_t rump_susercred;
     98 
     99 /* pretend the master rump proc is init */
    100 struct proc *initproc = &proc0;
    101 
    102 struct rumpuser_mtx *rump_giantlock;
    103 
    104 sigset_t sigcantmask;
    105 
    106 struct device rump_rootdev = {
    107 	.dv_class = DV_VIRTUAL
    108 };
    109 
    110 #ifdef RUMP_WITHOUT_THREADS
    111 int rump_threads = 0;
    112 #else
    113 int rump_threads = 1;
    114 #endif
    115 
    116 static void
    117 rump_aiodone_worker(struct work *wk, void *dummy)
    118 {
    119 	struct buf *bp = (struct buf *)wk;
    120 
    121 	KASSERT(&bp->b_work == wk);
    122 	bp->b_iodone(bp);
    123 }
    124 
    125 static int rump_inited;
    126 static struct emul emul_rump = {
    127 	.e_vm_default_addr = uvm_default_mapaddr,
    128 };
    129 
    130 int rump__unavailable(void);
    131 int rump__unavailable() {return EOPNOTSUPP;}
    132 __weak_alias(rump_net_init,rump__unavailable);
    133 __weak_alias(rump_vfs_init,rump__unavailable);
    134 __weak_alias(rump_dev_init,rump__unavailable);
    135 
    136 __weak_alias(rump_vfs_fini,rump__unavailable);
    137 
    138 __weak_alias(biodone,rump__unavailable);
    139 __weak_alias(sopoll,rump__unavailable);
    140 
    141 void rump__unavailable_vfs_panic(void);
    142 void rump__unavailable_vfs_panic() {panic("vfs component not available");}
    143 __weak_alias(usermount_common_policy,rump__unavailable_vfs_panic);
    144 
    145 rump_proc_vfs_init_fn rump_proc_vfs_init;
    146 rump_proc_vfs_release_fn rump_proc_vfs_release;
    147 
    148 /*
    149  * Stir up the stack a bit.  These are exported functions to help
    150  * convince the compiler that we don't want these routines completely
    151  * optimized out or inlined.  Is there an easier way to do this?
    152  */
    153 void nullfn(uint32_t *);
    154 void nullfn(uint32_t *arg){}
    155 void messthestack(void);
    156 void
    157 messthestack(void)
    158 {
    159 	uint32_t mess[64];
    160 	uint64_t d1, d2;
    161 	int i, error;
    162 
    163 	for (i = 0; i < 64; i++) {
    164 		rumpuser_gettime(&d1, &d2, &error);
    165 		mess[i] = d2;
    166 	}
    167 	nullfn(mess);
    168 }
    169 
    170 int
    171 rump__init(int rump_version)
    172 {
    173 	char buf[256];
    174 	struct proc *p;
    175 	struct lwp *l;
    176 	int i;
    177 	int error;
    178 
    179 	/* not reentrant */
    180 	if (rump_inited)
    181 		return 0;
    182 	else if (rump_inited == -1)
    183 		panic("rump_init: host process restart required");
    184 	else
    185 		rump_inited = 1;
    186 
    187 	/*
    188 	 * Seed arc4random() with a "reasonable" amount of randomness.
    189 	 * Yes, this is a quick kludge which depends on the arc4random
    190 	 * implementation.
    191 	 */
    192 	messthestack();
    193 	arc4random();
    194 
    195 	if (rump_version != RUMP_VERSION) {
    196 		printf("rump version mismatch, %d vs. %d\n",
    197 		    rump_version, RUMP_VERSION);
    198 		return EPROGMISMATCH;
    199 	}
    200 
    201 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    202 		rump_threads = *buf != '0';
    203 	}
    204 	rumpuser_thrinit(rump_user_schedule, rump_user_unschedule,
    205 	    rump_threads);
    206 	rump_intr_init();
    207 
    208 	/* init minimal lwp/cpu context */
    209 	l = &lwp0;
    210 	l->l_lid = 1;
    211 	l->l_cpu = rump_cpu;
    212 	rumpuser_set_curlwp(l);
    213 
    214 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    215 	rumpuser_mutex_recursive_init(&rump_giantlock);
    216 	ksyms_init();
    217 	rumpvm_init();
    218 	evcnt_init();
    219 
    220 	once_init();
    221 	prop_kern_init();
    222 
    223 	pool_subsystem_init();
    224 	kmem_init();
    225 
    226 	uvm_ra_init();
    227 
    228 	mutex_obj_init();
    229 	callout_startup();
    230 
    231 	kprintf_init();
    232 	loginit();
    233 
    234 	kauth_init();
    235 	rump_susercred = rump_cred_create(0, 0, 0, NULL);
    236 
    237 	/* init proc0 and rest of lwp0 now that we can allocate memory */
    238 	p = &proc0;
    239 	p->p_stats = &rump_stats;
    240 	p->p_limit = &rump_limits;
    241 	p->p_pgrp = &rump_pgrp;
    242 	p->p_pid = 0;
    243 	p->p_fd = &rump_filedesc0;
    244 	p->p_vmspace = &rump_vmspace;
    245 	p->p_emul = &emul_rump;
    246 	p->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    247 	l->l_cred = rump_cred_suserget();
    248 	l->l_proc = p;
    249 	LIST_INIT(&allproc);
    250 	LIST_INSERT_HEAD(&allproc, &proc0, p_list);
    251 	proc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    252 
    253 	rump_limits.pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
    254 	rump_limits.pl_rlimit[RLIMIT_NOFILE].rlim_cur = RLIM_INFINITY;
    255 	rump_limits.pl_rlimit[RLIMIT_SBSIZE].rlim_cur = RLIM_INFINITY;
    256 
    257 	rump_scheduler_init();
    258 	/* revert temporary context and schedule a real context */
    259 	l->l_cpu = NULL;
    260 	rumpuser_set_curlwp(NULL);
    261 	rump_schedule();
    262 
    263 	/* we are mostly go.  do per-cpu subsystem init */
    264 	for (i = 0; i < ncpu; i++) {
    265 		struct cpu_info *ci = cpu_lookup(i);
    266 
    267 		callout_init_cpu(ci);
    268 		softint_init(ci);
    269 		xc_init_cpu(ci);
    270 		pool_cache_cpu_init(ci);
    271 		selsysinit(ci);
    272 	}
    273 
    274 	sysctl_init();
    275 	kqueue_init();
    276 	iostat_init();
    277 	uid_init();
    278 	percpu_init();
    279 	fd_sys_init();
    280 	module_init();
    281 	devsw_init();
    282 	pipe_init();
    283 
    284 	/* these do nothing if not present */
    285 	rump_vfs_init();
    286 	rump_net_init();
    287 	rump_dev_init();
    288 	cold = 0;
    289 
    290 	/* aieeeedondest */
    291 	if (rump_threads) {
    292 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    293 		    rump_aiodone_worker, NULL, 0, 0, WQ_MPSAFE))
    294 			panic("aiodoned");
    295 	}
    296 
    297 	sysctl_finalize();
    298 
    299 	rumpuser_dl_module_bootstrap(rump_module_init, rump_kernelfsym_load);
    300 
    301 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    302 	hostnamelen = strlen(hostname);
    303 
    304 	sigemptyset(&sigcantmask);
    305 
    306 	lwp0.l_fd = proc0.p_fd = fd_init(&rump_filedesc0);
    307 
    308 	if (rump_threads)
    309 		vmem_rehash_start();
    310 
    311 	rump_unschedule();
    312 
    313 	return 0;
    314 }
    315 
    316 /* maybe support sys_reboot some day for remote shutdown */
    317 void
    318 rump_reboot(int howto)
    319 {
    320 
    321 	/* dump means we really take the dive here */
    322 	if ((howto & RB_DUMP) || panicstr) {
    323 		rumpuser_exit(RUMPUSER_PANIC);
    324 		/*NOTREACHED*/
    325 	}
    326 
    327 	/* try to sync */
    328 	if (!((howto & RB_NOSYNC) || panicstr)) {
    329 		rump_vfs_fini();
    330 	}
    331 
    332 	/* your wish is my command */
    333 	if (howto & RB_HALT) {
    334 		for (;;) {
    335 			uint64_t sec = 5, nsec = 0;
    336 			int error;
    337 
    338 			rumpuser_nanosleep(&sec, &nsec, &error);
    339 		}
    340 	}
    341 	rump_inited = -1;
    342 }
    343 
    344 struct uio *
    345 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    346 {
    347 	struct uio *uio;
    348 	enum uio_rw uiorw;
    349 
    350 	switch (rw) {
    351 	case RUMPUIO_READ:
    352 		uiorw = UIO_READ;
    353 		break;
    354 	case RUMPUIO_WRITE:
    355 		uiorw = UIO_WRITE;
    356 		break;
    357 	default:
    358 		panic("%s: invalid rw %d", __func__, rw);
    359 	}
    360 
    361 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    362 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    363 
    364 	uio->uio_iov->iov_base = buf;
    365 	uio->uio_iov->iov_len = bufsize;
    366 
    367 	uio->uio_iovcnt = 1;
    368 	uio->uio_offset = offset;
    369 	uio->uio_resid = bufsize;
    370 	uio->uio_rw = uiorw;
    371 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    372 
    373 	return uio;
    374 }
    375 
    376 size_t
    377 rump_uio_getresid(struct uio *uio)
    378 {
    379 
    380 	return uio->uio_resid;
    381 }
    382 
    383 off_t
    384 rump_uio_getoff(struct uio *uio)
    385 {
    386 
    387 	return uio->uio_offset;
    388 }
    389 
    390 size_t
    391 rump_uio_free(struct uio *uio)
    392 {
    393 	size_t resid;
    394 
    395 	resid = uio->uio_resid;
    396 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    397 	kmem_free(uio, sizeof(*uio));
    398 
    399 	return resid;
    400 }
    401 
    402 static pid_t nextpid = 1;
    403 struct lwp *
    404 rump_newproc_switch()
    405 {
    406 	struct lwp *l;
    407 	pid_t mypid;
    408 
    409 	mypid = atomic_inc_uint_nv(&nextpid);
    410 	if (__predict_false(mypid == 0))
    411 		mypid = atomic_inc_uint_nv(&nextpid);
    412 
    413 	l = rump_lwp_alloc(mypid, 0);
    414 	rump_lwp_switch(l);
    415 
    416 	return l;
    417 }
    418 
    419 struct lwp *
    420 rump_lwp_alloc_and_switch(pid_t pid, lwpid_t lid)
    421 {
    422 	struct lwp *l;
    423 
    424 	l = rump_lwp_alloc(pid, lid);
    425 	rump_lwp_switch(l);
    426 
    427 	return l;
    428 }
    429 
    430 struct lwp *
    431 rump_lwp_alloc(pid_t pid, lwpid_t lid)
    432 {
    433 	struct lwp *l;
    434 	struct proc *p;
    435 
    436 	l = kmem_zalloc(sizeof(*l), KM_SLEEP);
    437 	if (pid != 0) {
    438 		p = kmem_zalloc(sizeof(*p), KM_SLEEP);
    439 		if (rump_proc_vfs_init)
    440 			rump_proc_vfs_init(p);
    441 		p->p_stats = &rump_stats;
    442 		p->p_limit = &rump_limits;
    443 		p->p_pid = pid;
    444 		p->p_vmspace = &rump_vmspace;
    445 		p->p_emul = &emul_rump;
    446 		p->p_fd = fd_init(NULL);
    447 		p->p_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    448 		l->l_cred = rump_cred_suserget();
    449 	} else {
    450 		p = &proc0;
    451 		l->l_cred = rump_susercred;
    452 	}
    453 
    454 	l->l_proc = p;
    455 	l->l_lid = lid;
    456 	l->l_fd = p->p_fd;
    457 	l->l_cpu = NULL;
    458 
    459 	return l;
    460 }
    461 
    462 void
    463 rump_lwp_switch(struct lwp *newlwp)
    464 {
    465 	struct lwp *l = curlwp;
    466 
    467 	rumpuser_set_curlwp(NULL);
    468 	newlwp->l_cpu = l->l_cpu;
    469 	newlwp->l_mutex = l->l_mutex;
    470 	l->l_mutex = NULL;
    471 	l->l_cpu = NULL;
    472 	rumpuser_set_curlwp(newlwp);
    473 	if (l->l_flag & LW_WEXIT)
    474 		rump_lwp_free(l);
    475 }
    476 
    477 /* XXX: this has effect only on non-pid0 lwps */
    478 void
    479 rump_lwp_release(struct lwp *l)
    480 {
    481 	struct proc *p;
    482 
    483 	p = l->l_proc;
    484 	if (p->p_pid != 0) {
    485 		mutex_obj_free(p->p_lock);
    486 		fd_free();
    487 		if (rump_proc_vfs_release)
    488 			rump_proc_vfs_release(p);
    489 		rump_cred_put(l->l_cred);
    490 		kmem_free(p, sizeof(*p));
    491 	}
    492 	KASSERT((l->l_flag & LW_WEXIT) == 0);
    493 	l->l_flag |= LW_WEXIT;
    494 }
    495 
    496 void
    497 rump_lwp_free(struct lwp *l)
    498 {
    499 
    500 	KASSERT(l->l_flag & LW_WEXIT);
    501 	KASSERT(l->l_mutex == NULL);
    502 	kmem_free(l, sizeof(*l));
    503 }
    504 
    505 struct lwp *
    506 rump_lwp_curlwp(void)
    507 {
    508 	struct lwp *l = curlwp;
    509 
    510 	if (l->l_flag & LW_WEXIT)
    511 		return NULL;
    512 	return l;
    513 }
    514 
    515 /* rump private.  NEEDS WORK! */
    516 void
    517 rump_set_vmspace(struct vmspace *vm)
    518 {
    519 	struct proc *p = curproc;
    520 
    521 	p->p_vmspace = vm;
    522 }
    523 
    524 kauth_cred_t
    525 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    526 {
    527 	kauth_cred_t cred;
    528 	int rv;
    529 
    530 	cred = kauth_cred_alloc();
    531 	kauth_cred_setuid(cred, uid);
    532 	kauth_cred_seteuid(cred, uid);
    533 	kauth_cred_setsvuid(cred, uid);
    534 	kauth_cred_setgid(cred, gid);
    535 	kauth_cred_setgid(cred, gid);
    536 	kauth_cred_setegid(cred, gid);
    537 	kauth_cred_setsvgid(cred, gid);
    538 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    539 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    540 	assert(rv == 0);
    541 
    542 	return cred;
    543 }
    544 
    545 void
    546 rump_cred_put(kauth_cred_t cred)
    547 {
    548 
    549 	kauth_cred_free(cred);
    550 }
    551 
    552 kauth_cred_t
    553 rump_cred_suserget(void)
    554 {
    555 
    556 	kauth_cred_hold(rump_susercred);
    557 	return rump_susercred;
    558 }
    559 
    560 /*
    561  * Return the next system lwpid
    562  */
    563 lwpid_t
    564 rump_nextlid(void)
    565 {
    566 	lwpid_t retid;
    567 
    568 	mutex_enter(proc0.p_lock);
    569 	/*
    570 	 * Take next one, don't return 0
    571 	 * XXX: most likely we'll have collisions in case this
    572 	 * wraps around.
    573 	 */
    574 	if (++proc0.p_nlwpid == 0)
    575 		++proc0.p_nlwpid;
    576 	retid = proc0.p_nlwpid;
    577 	mutex_exit(proc0.p_lock);
    578 
    579 	return retid;
    580 }
    581 
    582 #define ERROUT(err) do { rv = err; goto out; } while (/*CONSTCOND*/0)
    583 int
    584 rump_module_init(struct modinfo *mi, prop_dictionary_t props)
    585 {
    586 	struct module *mod;
    587 	int rv;
    588 
    589 	/* module_dummy */
    590 	if (mi->mi_name == NULL)
    591 		return EINVAL;
    592 
    593 	mutex_enter(&module_lock);
    594 	if (module_lookup(mi->mi_name))
    595 		ERROUT(EEXIST);
    596 
    597 	if (!module_compatible(mi->mi_version, __NetBSD_Version__))
    598 		ERROUT(EPROGMISMATCH);
    599 
    600 	rv = mi->mi_modcmd(MODULE_CMD_INIT, props);
    601 	if (rv == 0) {
    602 		mod = kmem_zalloc(sizeof(*mod), KM_SLEEP);
    603 		mod->mod_info = mi;
    604 		module_enqueue(mod);
    605 		if (mi->mi_class == MODULE_CLASS_SECMODEL)
    606 			secmodel_register();
    607 	}
    608 
    609  out:
    610 	mutex_exit(&module_lock);
    611 	return rv;
    612 }
    613 
    614 int
    615 rump_module_fini(struct modinfo *mi)
    616 {
    617 	int rv;
    618 
    619 	rv = mi->mi_modcmd(MODULE_CMD_FINI, NULL);
    620 	if (rv == 0 && mi->mi_class == MODULE_CLASS_SECMODEL)
    621 		secmodel_deregister();
    622 
    623 	return rv;
    624 }
    625 
    626 int
    627 rump_kernelfsym_load(void *symtab, uint64_t symsize,
    628 	char *strtab, uint64_t strsize)
    629 {
    630 	static int inited = 0;
    631 	Elf64_Ehdr ehdr;
    632 
    633 	if (inited)
    634 		return EBUSY;
    635 	inited = 1;
    636 
    637 	/*
    638 	 * Use 64bit header since it's bigger.  Shouldn't make a
    639 	 * difference, since we're passing in all zeroes anyway.
    640 	 */
    641 	memset(&ehdr, 0, sizeof(ehdr));
    642 	ksyms_addsyms_explicit(&ehdr, symtab, symsize, strtab, strsize);
    643 
    644 	return 0;
    645 }
    646 
    647 static int
    648 rump_sysproxy_local(int num, void *arg, uint8_t *data, size_t dlen,
    649 	register_t *retval)
    650 {
    651 	struct lwp *l;
    652 	struct sysent *callp;
    653 	int rv;
    654 
    655 	if (__predict_false(num >= SYS_NSYSENT))
    656 		return ENOSYS;
    657 
    658 	callp = rump_sysent + num;
    659 	rump_schedule();
    660 	l = curlwp;
    661 	rv = callp->sy_call(l, (void *)data, retval);
    662 	rump_unschedule();
    663 
    664 	return rv;
    665 }
    666 
    667 int
    668 rump_boot_gethowto()
    669 {
    670 
    671 	return boothowto;
    672 }
    673 
    674 void
    675 rump_boot_sethowto(int howto)
    676 {
    677 
    678 	boothowto = howto;
    679 }
    680 
    681 rump_sysproxy_t rump_sysproxy = rump_sysproxy_local;
    682 void *rump_sysproxy_arg;
    683 
    684 /*
    685  * This whole syscall-via-rpc is still taking form.  For example, it
    686  * may be necessary to set syscalls individually instead of lobbing
    687  * them all to the same place.  So don't think this interface is
    688  * set in stone.
    689  */
    690 int
    691 rump_sysproxy_set(rump_sysproxy_t proxy, void *arg)
    692 {
    693 
    694 	if (rump_sysproxy_arg)
    695 		return EBUSY;
    696 
    697 	rump_sysproxy_arg = arg;
    698 	rump_sysproxy = proxy;
    699 
    700 	return 0;
    701 }
    702 
    703 int
    704 rump_getversion(void)
    705 {
    706 
    707 	return __NetBSD_Version__;
    708 }
    709