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rump.c revision 1.86 
      1 /*	$NetBSD: rump.c,v 1.86 2009/01/11 16:19:35 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 1.86 2009/01/11 16:19:35 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/filedesc.h>
     40 #include <sys/iostat.h>
     41 #include <sys/kauth.h>
     42 #include <sys/kernel.h>
     43 #include <sys/kmem.h>
     44 #include <sys/kprintf.h>
     45 #include <sys/ksyms.h>
     46 #include <sys/msgbuf.h>
     47 #include <sys/module.h>
     48 #include <sys/once.h>
     49 #include <sys/percpu.h>
     50 #include <sys/queue.h>
     51 #include <sys/resourcevar.h>
     52 #include <sys/select.h>
     53 #include <sys/uidinfo.h>
     54 #include <sys/sysctl.h>
     55 
     56 #include <rump/rumpuser.h>
     57 
     58 #include "rump_private.h"
     59 #include "rump_net_private.h"
     60 #include "rump_vfs_private.h"
     61 
     62 struct proc proc0;
     63 struct session rump_session = {
     64 	.s_count = 1,
     65 	.s_flags = 0,
     66 	.s_leader = &proc0,
     67 	.s_login = "rumphobo",
     68 	.s_sid = 0,
     69 };
     70 struct pgrp rump_pgrp = {
     71 	.pg_members = LIST_HEAD_INITIALIZER(pg_members),
     72 	.pg_session = &rump_session,
     73 	.pg_jobc = 1,
     74 };
     75 struct pstats rump_stats;
     76 struct plimit rump_limits;
     77 struct cpu_info rump_cpu;
     78 struct filedesc rump_filedesc0;
     79 struct proclist allproc;
     80 char machine[] = "rump";
     81 static kauth_cred_t rump_susercred;
     82 
     83 struct rumpuser_mtx *rump_giantlock;
     84 
     85 sigset_t sigcantmask;
     86 
     87 #ifdef RUMP_WITHOUT_THREADS
     88 int rump_threads = 0;
     89 #else
     90 int rump_threads = 1;
     91 #endif
     92 
     93 static void
     94 rump_aiodone_worker(struct work *wk, void *dummy)
     95 {
     96 	struct buf *bp = (struct buf *)wk;
     97 
     98 	KASSERT(&bp->b_work == wk);
     99 	bp->b_iodone(bp);
    100 }
    101 
    102 static int rump_inited;
    103 static struct emul emul_rump;
    104 
    105 void rump__unavailable(void);
    106 void rump__unavailable() {}
    107 __weak_alias(rump_net_init,rump__unavailable);
    108 __weak_alias(rump_vfs_init,rump__unavailable);
    109 
    110 static void
    111 pvfsinit_nop(struct proc *p)
    112 {
    113 
    114 	return;
    115 }
    116 
    117 static void
    118 pvfsrele_nop(struct proc *p)
    119 {
    120 
    121 	return;
    122 }
    123 
    124 rump_proc_vfs_init_fn rump_proc_vfs_init = pvfsinit_nop;
    125 rump_proc_vfs_release_fn rump_proc_vfs_release = pvfsrele_nop;
    126 
    127 int
    128 rump__init(int rump_version)
    129 {
    130 	char buf[256];
    131 	struct proc *p;
    132 	struct lwp *l;
    133 	int error;
    134 
    135 	/* XXX */
    136 	if (rump_inited)
    137 		return 0;
    138 	rump_inited = 1;
    139 
    140 	if (rump_version != RUMP_VERSION) {
    141 		printf("rump version mismatch, %d vs. %d\n",
    142 		    rump_version, RUMP_VERSION);
    143 		return EPROGMISMATCH;
    144 	}
    145 
    146 	if (rumpuser_getenv("RUMP_NVNODES", buf, sizeof(buf), &error) == 0) {
    147 		desiredvnodes = strtoul(buf, NULL, 10);
    148 	} else {
    149 		desiredvnodes = 1<<16;
    150 	}
    151 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    152 		rump_threads = *buf != '0';
    153 	}
    154 	rumpuser_thrinit(_kernel_lock, _kernel_unlock, rump_threads);
    155 
    156 	rumpuser_mutex_recursive_init(&rump_giantlock);
    157 	ksyms_init();
    158 
    159 	rumpvm_init();
    160 	rump_sleepers_init();
    161 #ifdef RUMP_USE_REAL_KMEM
    162 	kmem_init();
    163 #endif
    164 	kprintf_init();
    165 	loginit();
    166 
    167 	kauth_init();
    168 	rump_susercred = rump_cred_create(0, 0, 0, NULL);
    169 
    170 	l = &lwp0;
    171 	p = &proc0;
    172 	p->p_stats = &rump_stats;
    173 	p->p_limit = &rump_limits;
    174 	p->p_pgrp = &rump_pgrp;
    175 	p->p_pid = 0;
    176 	p->p_fd = &rump_filedesc0;
    177 	p->p_vmspace = &rump_vmspace;
    178 	p->p_emul = &emul_rump;
    179 	l->l_cred = rump_cred_suserget();
    180 	l->l_proc = p;
    181 	l->l_lid = 1;
    182 	LIST_INSERT_HEAD(&allproc, p, p_list);
    183 
    184 	rump_limits.pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
    185 	rump_limits.pl_rlimit[RLIMIT_NOFILE].rlim_cur = RLIM_INFINITY;
    186 	rump_limits.pl_rlimit[RLIMIT_SBSIZE].rlim_cur = RLIM_INFINITY;
    187 
    188 	callout_startup();
    189 	callout_init_cpu(&rump_cpu);
    190 
    191 	once_init();
    192 	iostat_init();
    193 	uid_init();
    194 	percpu_init();
    195 	fd_sys_init();
    196 	module_init();
    197 	sysctl_init();
    198 	softint_init(&rump_cpu);
    199 	cold = 0;
    200 	devsw_init();
    201 
    202 	/* these do nothing if not present */
    203 	rump_vfs_init();
    204 	rump_net_init();
    205 
    206 	/* aieeeedondest */
    207 	if (rump_threads) {
    208 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    209 		    rump_aiodone_worker, NULL, 0, 0, 0))
    210 			panic("aiodoned");
    211 	}
    212 
    213 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    214 	hostnamelen = strlen(hostname);
    215 
    216 	sigemptyset(&sigcantmask);
    217 
    218 	lwp0.l_fd = proc0.p_fd = fd_init(&rump_filedesc0);
    219 
    220 	return 0;
    221 }
    222 
    223 struct uio *
    224 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    225 {
    226 	struct uio *uio;
    227 	enum uio_rw uiorw;
    228 
    229 	switch (rw) {
    230 	case RUMPUIO_READ:
    231 		uiorw = UIO_READ;
    232 		break;
    233 	case RUMPUIO_WRITE:
    234 		uiorw = UIO_WRITE;
    235 		break;
    236 	default:
    237 		panic("%s: invalid rw %d", __func__, rw);
    238 	}
    239 
    240 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    241 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    242 
    243 	uio->uio_iov->iov_base = buf;
    244 	uio->uio_iov->iov_len = bufsize;
    245 
    246 	uio->uio_iovcnt = 1;
    247 	uio->uio_offset = offset;
    248 	uio->uio_resid = bufsize;
    249 	uio->uio_rw = uiorw;
    250 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    251 
    252 	return uio;
    253 }
    254 
    255 size_t
    256 rump_uio_getresid(struct uio *uio)
    257 {
    258 
    259 	return uio->uio_resid;
    260 }
    261 
    262 off_t
    263 rump_uio_getoff(struct uio *uio)
    264 {
    265 
    266 	return uio->uio_offset;
    267 }
    268 
    269 size_t
    270 rump_uio_free(struct uio *uio)
    271 {
    272 	size_t resid;
    273 
    274 	resid = uio->uio_resid;
    275 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    276 	kmem_free(uio, sizeof(*uio));
    277 
    278 	return resid;
    279 }
    280 
    281 struct lwp *
    282 rump_setup_curlwp(pid_t pid, lwpid_t lid, int set)
    283 {
    284 	struct lwp *l;
    285 	struct proc *p;
    286 
    287 	l = kmem_zalloc(sizeof(struct lwp), KM_SLEEP);
    288 	if (pid != 0) {
    289 		p = kmem_zalloc(sizeof(struct proc), KM_SLEEP);
    290 		rump_proc_vfs_init(p);
    291 		p->p_stats = &rump_stats;
    292 		p->p_limit = &rump_limits;
    293 		p->p_pid = pid;
    294 		p->p_vmspace = &rump_vmspace;
    295 		p->p_fd = fd_init(NULL);
    296 	} else {
    297 		p = &proc0;
    298 	}
    299 
    300 	l->l_cred = rump_cred_suserget();
    301 	l->l_proc = p;
    302 	l->l_lid = lid;
    303 	l->l_fd = p->p_fd;
    304 	l->l_mutex = RUMP_LMUTEX_MAGIC;
    305 	l->l_cpu = &rump_cpu;
    306 
    307 	if (set)
    308 		rumpuser_set_curlwp(l);
    309 
    310 	return l;
    311 }
    312 
    313 void
    314 rump_clear_curlwp()
    315 {
    316 	struct lwp *l;
    317 
    318 	l = rumpuser_get_curlwp();
    319 	if (l->l_proc->p_pid != 0) {
    320 		fd_free();
    321 		rump_proc_vfs_release(l->l_proc);
    322 		rump_cred_destroy(l->l_cred);
    323 		kmem_free(l->l_proc, sizeof(*l->l_proc));
    324 	}
    325 	kmem_free(l, sizeof(*l));
    326 	rumpuser_set_curlwp(NULL);
    327 }
    328 
    329 struct lwp *
    330 rump_get_curlwp()
    331 {
    332 	struct lwp *l;
    333 
    334 	l = rumpuser_get_curlwp();
    335 	if (l == NULL)
    336 		l = &lwp0;
    337 
    338 	return l;
    339 }
    340 
    341 int
    342 rump_splfoo()
    343 {
    344 
    345 	if (rumpuser_whatis_ipl() != RUMPUSER_IPL_INTR) {
    346 		rumpuser_rw_enter(&rumpspl, 0);
    347 		rumpuser_set_ipl(RUMPUSER_IPL_SPLFOO);
    348 	}
    349 
    350 	return 0;
    351 }
    352 
    353 void
    354 rump_intr_enter(void)
    355 {
    356 
    357 	rumpuser_set_ipl(RUMPUSER_IPL_INTR);
    358 	rumpuser_rw_enter(&rumpspl, 1);
    359 }
    360 
    361 void
    362 rump_intr_exit(void)
    363 {
    364 
    365 	rumpuser_rw_exit(&rumpspl);
    366 	rumpuser_clear_ipl(RUMPUSER_IPL_INTR);
    367 }
    368 
    369 void
    370 rump_splx(int dummy)
    371 {
    372 
    373 	if (rumpuser_whatis_ipl() != RUMPUSER_IPL_INTR) {
    374 		rumpuser_clear_ipl(RUMPUSER_IPL_SPLFOO);
    375 		rumpuser_rw_exit(&rumpspl);
    376 	}
    377 }
    378 
    379 kauth_cred_t
    380 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    381 {
    382 	kauth_cred_t cred;
    383 	int rv;
    384 
    385 	cred = kauth_cred_alloc();
    386 	kauth_cred_setuid(cred, uid);
    387 	kauth_cred_seteuid(cred, uid);
    388 	kauth_cred_setsvuid(cred, uid);
    389 	kauth_cred_setgid(cred, gid);
    390 	kauth_cred_setgid(cred, gid);
    391 	kauth_cred_setegid(cred, gid);
    392 	kauth_cred_setsvgid(cred, gid);
    393 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    394 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    395 	assert(rv == 0);
    396 
    397 	return cred;
    398 }
    399 
    400 void
    401 rump_cred_destroy(kauth_cred_t cred)
    402 {
    403 
    404 	kauth_cred_free(cred);
    405 }
    406 
    407 kauth_cred_t
    408 rump_cred_suserget()
    409 {
    410 
    411 	kauth_cred_hold(rump_susercred);
    412 	return rump_susercred;
    413 }
    414 
    415 /* XXX: if they overflow, we're screwed */
    416 lwpid_t
    417 rump_nextlid()
    418 {
    419 	static unsigned lwpid = 2;
    420 
    421 	do {
    422 		lwpid = atomic_inc_uint_nv(&lwpid);
    423 	} while (lwpid == 0);
    424 
    425 	return (lwpid_t)lwpid;
    426 }
    427 
    428 int
    429 rump_module_load(struct modinfo **mi)
    430 {
    431 
    432 	if (!module_compatible((*mi)->mi_version, __NetBSD_Version__))
    433 		return EPROGMISMATCH;
    434 
    435 	return (*mi)->mi_modcmd(MODULE_CMD_INIT, NULL);
    436 }
    437 
    438 int _syspuffs_stub(int, int *);
    439 int
    440 _syspuffs_stub(int fd, int *newfd)
    441 {
    442 
    443 	return ENODEV;
    444 }
    445 __weak_alias(rump_syspuffs_glueinit,_syspuffs_stub);
    446