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rump.c revision 1.89 
      1 /*	$NetBSD: rump.c,v 1.89 2009/01/23 13:14:17 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 1.89 2009/01/23 13:14:17 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/sysctl.h>
     54 #include <sys/tty.h>
     55 #include <sys/uidinfo.h>
     56 #include <sys/vmem.h>
     57 
     58 #include <rump/rumpuser.h>
     59 
     60 #include "rump_private.h"
     61 #include "rump_net_private.h"
     62 #include "rump_vfs_private.h"
     63 
     64 struct proc proc0;
     65 struct session rump_session = {
     66 	.s_count = 1,
     67 	.s_flags = 0,
     68 	.s_leader = &proc0,
     69 	.s_login = "rumphobo",
     70 	.s_sid = 0,
     71 };
     72 struct pgrp rump_pgrp = {
     73 	.pg_members = LIST_HEAD_INITIALIZER(pg_members),
     74 	.pg_session = &rump_session,
     75 	.pg_jobc = 1,
     76 };
     77 struct pstats rump_stats;
     78 struct plimit rump_limits;
     79 struct cpu_info rump_cpu;
     80 struct filedesc rump_filedesc0;
     81 struct proclist allproc;
     82 char machine[] = "rump";
     83 static kauth_cred_t rump_susercred;
     84 
     85 struct rumpuser_mtx *rump_giantlock;
     86 
     87 sigset_t sigcantmask;
     88 
     89 #ifdef RUMP_WITHOUT_THREADS
     90 int rump_threads = 0;
     91 #else
     92 int rump_threads = 1;
     93 #endif
     94 
     95 static void
     96 rump_aiodone_worker(struct work *wk, void *dummy)
     97 {
     98 	struct buf *bp = (struct buf *)wk;
     99 
    100 	KASSERT(&bp->b_work == wk);
    101 	bp->b_iodone(bp);
    102 }
    103 
    104 static int rump_inited;
    105 static struct emul emul_rump;
    106 
    107 void rump__unavailable(void);
    108 void rump__unavailable() {}
    109 __weak_alias(rump_net_init,rump__unavailable);
    110 __weak_alias(rump_vfs_init,rump__unavailable);
    111 
    112 static void
    113 pvfsinit_nop(struct proc *p)
    114 {
    115 
    116 	return;
    117 }
    118 
    119 static void
    120 pvfsrele_nop(struct proc *p)
    121 {
    122 
    123 	return;
    124 }
    125 
    126 rump_proc_vfs_init_fn rump_proc_vfs_init = pvfsinit_nop;
    127 rump_proc_vfs_release_fn rump_proc_vfs_release = pvfsrele_nop;
    128 
    129 int
    130 rump__init(int rump_version)
    131 {
    132 	char buf[256];
    133 	struct proc *p;
    134 	struct lwp *l;
    135 	int error;
    136 
    137 	/* XXX */
    138 	if (rump_inited)
    139 		return 0;
    140 	rump_inited = 1;
    141 
    142 	if (rump_version != RUMP_VERSION) {
    143 		printf("rump version mismatch, %d vs. %d\n",
    144 		    rump_version, RUMP_VERSION);
    145 		return EPROGMISMATCH;
    146 	}
    147 
    148 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    149 		rump_threads = *buf != '0';
    150 	}
    151 	rumpuser_thrinit(_kernel_lock, _kernel_unlock, rump_threads);
    152 
    153 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    154 	rumpuser_mutex_recursive_init(&rump_giantlock);
    155 	ksyms_init();
    156 	rumpvm_init();
    157 
    158 	once_init();
    159 	pool_subsystem_init();
    160 
    161 	rump_sleepers_init();
    162 #ifdef RUMP_USE_REAL_ALLOCATORS
    163 	kmem_init();
    164 #endif
    165 	kprintf_init();
    166 	loginit();
    167 
    168 	kauth_init();
    169 	rump_susercred = rump_cred_create(0, 0, 0, NULL);
    170 
    171 	l = &lwp0;
    172 	p = &proc0;
    173 	p->p_stats = &rump_stats;
    174 	p->p_limit = &rump_limits;
    175 	p->p_pgrp = &rump_pgrp;
    176 	p->p_pid = 0;
    177 	p->p_fd = &rump_filedesc0;
    178 	p->p_vmspace = &rump_vmspace;
    179 	p->p_emul = &emul_rump;
    180 	l->l_cred = rump_cred_suserget();
    181 	l->l_proc = p;
    182 	l->l_lid = 1;
    183 	LIST_INSERT_HEAD(&allproc, p, p_list);
    184 
    185 	rump_limits.pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
    186 	rump_limits.pl_rlimit[RLIMIT_NOFILE].rlim_cur = RLIM_INFINITY;
    187 	rump_limits.pl_rlimit[RLIMIT_SBSIZE].rlim_cur = RLIM_INFINITY;
    188 
    189 	callout_startup();
    190 	callout_init_cpu(&rump_cpu);
    191 
    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 #ifdef RUMP_USE_REAL_ALLOCATORS
    221 	if (rump_threads)
    222 		vmem_rehash_start();
    223 #endif
    224 
    225 	return 0;
    226 }
    227 
    228 struct uio *
    229 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    230 {
    231 	struct uio *uio;
    232 	enum uio_rw uiorw;
    233 
    234 	switch (rw) {
    235 	case RUMPUIO_READ:
    236 		uiorw = UIO_READ;
    237 		break;
    238 	case RUMPUIO_WRITE:
    239 		uiorw = UIO_WRITE;
    240 		break;
    241 	default:
    242 		panic("%s: invalid rw %d", __func__, rw);
    243 	}
    244 
    245 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    246 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    247 
    248 	uio->uio_iov->iov_base = buf;
    249 	uio->uio_iov->iov_len = bufsize;
    250 
    251 	uio->uio_iovcnt = 1;
    252 	uio->uio_offset = offset;
    253 	uio->uio_resid = bufsize;
    254 	uio->uio_rw = uiorw;
    255 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    256 
    257 	return uio;
    258 }
    259 
    260 size_t
    261 rump_uio_getresid(struct uio *uio)
    262 {
    263 
    264 	return uio->uio_resid;
    265 }
    266 
    267 off_t
    268 rump_uio_getoff(struct uio *uio)
    269 {
    270 
    271 	return uio->uio_offset;
    272 }
    273 
    274 size_t
    275 rump_uio_free(struct uio *uio)
    276 {
    277 	size_t resid;
    278 
    279 	resid = uio->uio_resid;
    280 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    281 	kmem_free(uio, sizeof(*uio));
    282 
    283 	return resid;
    284 }
    285 
    286 struct lwp *
    287 rump_setup_curlwp(pid_t pid, lwpid_t lid, int set)
    288 {
    289 	struct lwp *l;
    290 	struct proc *p;
    291 
    292 	l = kmem_zalloc(sizeof(struct lwp), KM_SLEEP);
    293 	if (pid != 0) {
    294 		p = kmem_zalloc(sizeof(struct proc), KM_SLEEP);
    295 		rump_proc_vfs_init(p);
    296 		p->p_stats = &rump_stats;
    297 		p->p_limit = &rump_limits;
    298 		p->p_pid = pid;
    299 		p->p_vmspace = &rump_vmspace;
    300 		p->p_fd = fd_init(NULL);
    301 	} else {
    302 		p = &proc0;
    303 	}
    304 
    305 	l->l_cred = rump_cred_suserget();
    306 	l->l_proc = p;
    307 	l->l_lid = lid;
    308 	l->l_fd = p->p_fd;
    309 	l->l_mutex = RUMP_LMUTEX_MAGIC;
    310 	l->l_cpu = &rump_cpu;
    311 
    312 	if (set)
    313 		rumpuser_set_curlwp(l);
    314 
    315 	return l;
    316 }
    317 
    318 void
    319 rump_clear_curlwp()
    320 {
    321 	struct lwp *l;
    322 
    323 	l = rumpuser_get_curlwp();
    324 	if (l->l_proc->p_pid != 0) {
    325 		fd_free();
    326 		rump_proc_vfs_release(l->l_proc);
    327 		rump_cred_destroy(l->l_cred);
    328 		kmem_free(l->l_proc, sizeof(*l->l_proc));
    329 	}
    330 	kmem_free(l, sizeof(*l));
    331 	rumpuser_set_curlwp(NULL);
    332 }
    333 
    334 struct lwp *
    335 rump_get_curlwp()
    336 {
    337 	struct lwp *l;
    338 
    339 	l = rumpuser_get_curlwp();
    340 	if (l == NULL)
    341 		l = &lwp0;
    342 
    343 	return l;
    344 }
    345 
    346 int
    347 rump_splfoo()
    348 {
    349 
    350 	if (rumpuser_whatis_ipl() != RUMPUSER_IPL_INTR) {
    351 		rumpuser_rw_enter(&rumpspl, 0);
    352 		rumpuser_set_ipl(RUMPUSER_IPL_SPLFOO);
    353 	}
    354 
    355 	return 0;
    356 }
    357 
    358 void
    359 rump_intr_enter(void)
    360 {
    361 
    362 	rumpuser_set_ipl(RUMPUSER_IPL_INTR);
    363 	rumpuser_rw_enter(&rumpspl, 1);
    364 }
    365 
    366 void
    367 rump_intr_exit(void)
    368 {
    369 
    370 	rumpuser_rw_exit(&rumpspl);
    371 	rumpuser_clear_ipl(RUMPUSER_IPL_INTR);
    372 }
    373 
    374 void
    375 rump_splx(int dummy)
    376 {
    377 
    378 	if (rumpuser_whatis_ipl() != RUMPUSER_IPL_INTR) {
    379 		rumpuser_clear_ipl(RUMPUSER_IPL_SPLFOO);
    380 		rumpuser_rw_exit(&rumpspl);
    381 	}
    382 }
    383 
    384 kauth_cred_t
    385 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    386 {
    387 	kauth_cred_t cred;
    388 	int rv;
    389 
    390 	cred = kauth_cred_alloc();
    391 	kauth_cred_setuid(cred, uid);
    392 	kauth_cred_seteuid(cred, uid);
    393 	kauth_cred_setsvuid(cred, uid);
    394 	kauth_cred_setgid(cred, gid);
    395 	kauth_cred_setgid(cred, gid);
    396 	kauth_cred_setegid(cred, gid);
    397 	kauth_cred_setsvgid(cred, gid);
    398 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    399 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    400 	assert(rv == 0);
    401 
    402 	return cred;
    403 }
    404 
    405 void
    406 rump_cred_destroy(kauth_cred_t cred)
    407 {
    408 
    409 	kauth_cred_free(cred);
    410 }
    411 
    412 kauth_cred_t
    413 rump_cred_suserget()
    414 {
    415 
    416 	kauth_cred_hold(rump_susercred);
    417 	return rump_susercred;
    418 }
    419 
    420 /* XXX: if they overflow, we're screwed */
    421 lwpid_t
    422 rump_nextlid()
    423 {
    424 	static unsigned lwpid = 2;
    425 
    426 	do {
    427 		lwpid = atomic_inc_uint_nv(&lwpid);
    428 	} while (lwpid == 0);
    429 
    430 	return (lwpid_t)lwpid;
    431 }
    432 
    433 int
    434 rump_module_load(struct modinfo **mi)
    435 {
    436 
    437 	if (!module_compatible((*mi)->mi_version, __NetBSD_Version__))
    438 		return EPROGMISMATCH;
    439 
    440 	return (*mi)->mi_modcmd(MODULE_CMD_INIT, NULL);
    441 }
    442 
    443 int _syspuffs_stub(int, int *);
    444 int
    445 _syspuffs_stub(int fd, int *newfd)
    446 {
    447 
    448 	return ENODEV;
    449 }
    450 __weak_alias(rump_syspuffs_glueinit,_syspuffs_stub);
    451