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rump.c revision 1.91 
      1 /*	$NetBSD: rump.c,v 1.91 2009/01/26 14:41:28 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 1.91 2009/01/26 14:41:28 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 
    160 	rump_sleepers_init();
    161 #ifdef RUMP_USE_REAL_ALLOCATORS
    162 	pool_subsystem_init();
    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 	proc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    185 
    186 	rump_limits.pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
    187 	rump_limits.pl_rlimit[RLIMIT_NOFILE].rlim_cur = RLIM_INFINITY;
    188 	rump_limits.pl_rlimit[RLIMIT_SBSIZE].rlim_cur = RLIM_INFINITY;
    189 
    190 	callout_startup();
    191 	callout_init_cpu(&rump_cpu);
    192 
    193 	iostat_init();
    194 	uid_init();
    195 	percpu_init();
    196 	fd_sys_init();
    197 	module_init();
    198 	sysctl_init();
    199 	softint_init(&rump_cpu);
    200 	cold = 0;
    201 	devsw_init();
    202 
    203 	/* these do nothing if not present */
    204 	rump_vfs_init();
    205 	rump_net_init();
    206 
    207 	/* aieeeedondest */
    208 	if (rump_threads) {
    209 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    210 		    rump_aiodone_worker, NULL, 0, 0, 0))
    211 			panic("aiodoned");
    212 	}
    213 
    214 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    215 	hostnamelen = strlen(hostname);
    216 
    217 	sigemptyset(&sigcantmask);
    218 
    219 	lwp0.l_fd = proc0.p_fd = fd_init(&rump_filedesc0);
    220 
    221 #ifdef RUMP_USE_REAL_ALLOCATORS
    222 	if (rump_threads)
    223 		vmem_rehash_start();
    224 #endif
    225 
    226 	return 0;
    227 }
    228 
    229 struct uio *
    230 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    231 {
    232 	struct uio *uio;
    233 	enum uio_rw uiorw;
    234 
    235 	switch (rw) {
    236 	case RUMPUIO_READ:
    237 		uiorw = UIO_READ;
    238 		break;
    239 	case RUMPUIO_WRITE:
    240 		uiorw = UIO_WRITE;
    241 		break;
    242 	default:
    243 		panic("%s: invalid rw %d", __func__, rw);
    244 	}
    245 
    246 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    247 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    248 
    249 	uio->uio_iov->iov_base = buf;
    250 	uio->uio_iov->iov_len = bufsize;
    251 
    252 	uio->uio_iovcnt = 1;
    253 	uio->uio_offset = offset;
    254 	uio->uio_resid = bufsize;
    255 	uio->uio_rw = uiorw;
    256 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    257 
    258 	return uio;
    259 }
    260 
    261 size_t
    262 rump_uio_getresid(struct uio *uio)
    263 {
    264 
    265 	return uio->uio_resid;
    266 }
    267 
    268 off_t
    269 rump_uio_getoff(struct uio *uio)
    270 {
    271 
    272 	return uio->uio_offset;
    273 }
    274 
    275 size_t
    276 rump_uio_free(struct uio *uio)
    277 {
    278 	size_t resid;
    279 
    280 	resid = uio->uio_resid;
    281 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    282 	kmem_free(uio, sizeof(*uio));
    283 
    284 	return resid;
    285 }
    286 
    287 struct lwp *
    288 rump_setup_curlwp(pid_t pid, lwpid_t lid, int set)
    289 {
    290 	struct lwp *l;
    291 	struct proc *p;
    292 
    293 	l = kmem_zalloc(sizeof(struct lwp), KM_SLEEP);
    294 	if (pid != 0) {
    295 		p = kmem_zalloc(sizeof(struct proc), KM_SLEEP);
    296 		rump_proc_vfs_init(p);
    297 		p->p_stats = &rump_stats;
    298 		p->p_limit = &rump_limits;
    299 		p->p_pid = pid;
    300 		p->p_vmspace = &rump_vmspace;
    301 		p->p_fd = fd_init(NULL);
    302 	} else {
    303 		p = &proc0;
    304 	}
    305 
    306 	l->l_cred = rump_cred_suserget();
    307 	l->l_proc = p;
    308 	l->l_lid = lid;
    309 	l->l_fd = p->p_fd;
    310 	l->l_mutex = RUMP_LMUTEX_MAGIC;
    311 	l->l_cpu = &rump_cpu;
    312 
    313 	if (set)
    314 		rumpuser_set_curlwp(l);
    315 
    316 	return l;
    317 }
    318 
    319 void
    320 rump_clear_curlwp()
    321 {
    322 	struct lwp *l;
    323 
    324 	l = rumpuser_get_curlwp();
    325 	if (l->l_proc->p_pid != 0) {
    326 		fd_free();
    327 		rump_proc_vfs_release(l->l_proc);
    328 		rump_cred_destroy(l->l_cred);
    329 		kmem_free(l->l_proc, sizeof(*l->l_proc));
    330 	}
    331 	kmem_free(l, sizeof(*l));
    332 	rumpuser_set_curlwp(NULL);
    333 }
    334 
    335 struct lwp *
    336 rump_get_curlwp()
    337 {
    338 	struct lwp *l;
    339 
    340 	l = rumpuser_get_curlwp();
    341 	if (l == NULL)
    342 		l = &lwp0;
    343 
    344 	return l;
    345 }
    346 
    347 int
    348 rump_splfoo()
    349 {
    350 
    351 	if (rumpuser_whatis_ipl() != RUMPUSER_IPL_INTR) {
    352 		rumpuser_rw_enter(&rumpspl, 0);
    353 		rumpuser_set_ipl(RUMPUSER_IPL_SPLFOO);
    354 	}
    355 
    356 	return 0;
    357 }
    358 
    359 void
    360 rump_intr_enter(void)
    361 {
    362 
    363 	rumpuser_set_ipl(RUMPUSER_IPL_INTR);
    364 	rumpuser_rw_enter(&rumpspl, 1);
    365 }
    366 
    367 void
    368 rump_intr_exit(void)
    369 {
    370 
    371 	rumpuser_rw_exit(&rumpspl);
    372 	rumpuser_clear_ipl(RUMPUSER_IPL_INTR);
    373 }
    374 
    375 void
    376 rump_splx(int dummy)
    377 {
    378 
    379 	if (rumpuser_whatis_ipl() != RUMPUSER_IPL_INTR) {
    380 		rumpuser_clear_ipl(RUMPUSER_IPL_SPLFOO);
    381 		rumpuser_rw_exit(&rumpspl);
    382 	}
    383 }
    384 
    385 kauth_cred_t
    386 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    387 {
    388 	kauth_cred_t cred;
    389 	int rv;
    390 
    391 	cred = kauth_cred_alloc();
    392 	kauth_cred_setuid(cred, uid);
    393 	kauth_cred_seteuid(cred, uid);
    394 	kauth_cred_setsvuid(cred, uid);
    395 	kauth_cred_setgid(cred, gid);
    396 	kauth_cred_setgid(cred, gid);
    397 	kauth_cred_setegid(cred, gid);
    398 	kauth_cred_setsvgid(cred, gid);
    399 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    400 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    401 	assert(rv == 0);
    402 
    403 	return cred;
    404 }
    405 
    406 void
    407 rump_cred_destroy(kauth_cred_t cred)
    408 {
    409 
    410 	kauth_cred_free(cred);
    411 }
    412 
    413 kauth_cred_t
    414 rump_cred_suserget()
    415 {
    416 
    417 	kauth_cred_hold(rump_susercred);
    418 	return rump_susercred;
    419 }
    420 
    421 /* XXX: if they overflow, we're screwed */
    422 lwpid_t
    423 rump_nextlid()
    424 {
    425 	static unsigned lwpid = 2;
    426 
    427 	do {
    428 		lwpid = atomic_inc_uint_nv(&lwpid);
    429 	} while (lwpid == 0);
    430 
    431 	return (lwpid_t)lwpid;
    432 }
    433 
    434 int
    435 rump_module_load(struct modinfo **mi)
    436 {
    437 
    438 	if (!module_compatible((*mi)->mi_version, __NetBSD_Version__))
    439 		return EPROGMISMATCH;
    440 
    441 	return (*mi)->mi_modcmd(MODULE_CMD_INIT, NULL);
    442 }
    443 
    444 int _syspuffs_stub(int, int *);
    445 int
    446 _syspuffs_stub(int fd, int *newfd)
    447 {
    448 
    449 	return ENODEV;
    450 }
    451 __weak_alias(rump_syspuffs_glueinit,_syspuffs_stub);
    452