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rump.c revision 1.92 
      1 /*	$NetBSD: rump.c,v 1.92 2009/02/06 19:49:13 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 1.92 2009/02/06 19:49:13 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 void rump__unavailable_vfs_panic(void);
    113 void rump__unavailable_vfs_panic() {panic("vfs component not available");}
    114 __weak_alias(vn_open,rump__unavailable_vfs_panic);
    115 __weak_alias(vn_rdwr,rump__unavailable_vfs_panic);
    116 __weak_alias(vn_close,rump__unavailable_vfs_panic);
    117 
    118 static void
    119 pvfsinit_nop(struct proc *p)
    120 {
    121 
    122 	return;
    123 }
    124 
    125 static void
    126 pvfsrele_nop(struct proc *p)
    127 {
    128 
    129 	return;
    130 }
    131 
    132 rump_proc_vfs_init_fn rump_proc_vfs_init = pvfsinit_nop;
    133 rump_proc_vfs_release_fn rump_proc_vfs_release = pvfsrele_nop;
    134 
    135 int
    136 rump__init(int rump_version)
    137 {
    138 	char buf[256];
    139 	struct proc *p;
    140 	struct lwp *l;
    141 	int error;
    142 
    143 	/* XXX */
    144 	if (rump_inited)
    145 		return 0;
    146 	rump_inited = 1;
    147 
    148 	if (rump_version != RUMP_VERSION) {
    149 		printf("rump version mismatch, %d vs. %d\n",
    150 		    rump_version, RUMP_VERSION);
    151 		return EPROGMISMATCH;
    152 	}
    153 
    154 	if (rumpuser_getenv("RUMP_THREADS", buf, sizeof(buf), &error) == 0) {
    155 		rump_threads = *buf != '0';
    156 	}
    157 	rumpuser_thrinit(_kernel_lock, _kernel_unlock, rump_threads);
    158 
    159 	mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_NONE);
    160 	rumpuser_mutex_recursive_init(&rump_giantlock);
    161 	ksyms_init();
    162 	rumpvm_init();
    163 
    164 	once_init();
    165 
    166 	rump_sleepers_init();
    167 #ifdef RUMP_USE_REAL_ALLOCATORS
    168 	pool_subsystem_init();
    169 	kmem_init();
    170 #endif
    171 	kprintf_init();
    172 	loginit();
    173 
    174 	kauth_init();
    175 	rump_susercred = rump_cred_create(0, 0, 0, NULL);
    176 
    177 	l = &lwp0;
    178 	p = &proc0;
    179 	p->p_stats = &rump_stats;
    180 	p->p_limit = &rump_limits;
    181 	p->p_pgrp = &rump_pgrp;
    182 	p->p_pid = 0;
    183 	p->p_fd = &rump_filedesc0;
    184 	p->p_vmspace = &rump_vmspace;
    185 	p->p_emul = &emul_rump;
    186 	l->l_cred = rump_cred_suserget();
    187 	l->l_proc = p;
    188 	l->l_lid = 1;
    189 	LIST_INSERT_HEAD(&allproc, p, p_list);
    190 	proc_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
    191 
    192 	rump_limits.pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
    193 	rump_limits.pl_rlimit[RLIMIT_NOFILE].rlim_cur = RLIM_INFINITY;
    194 	rump_limits.pl_rlimit[RLIMIT_SBSIZE].rlim_cur = RLIM_INFINITY;
    195 
    196 	callout_startup();
    197 	callout_init_cpu(&rump_cpu);
    198 
    199 	iostat_init();
    200 	uid_init();
    201 	percpu_init();
    202 	fd_sys_init();
    203 	module_init();
    204 	sysctl_init();
    205 	softint_init(&rump_cpu);
    206 	cold = 0;
    207 	devsw_init();
    208 
    209 	/* these do nothing if not present */
    210 	rump_vfs_init();
    211 	rump_net_init();
    212 
    213 	/* aieeeedondest */
    214 	if (rump_threads) {
    215 		if (workqueue_create(&uvm.aiodone_queue, "aiodoned",
    216 		    rump_aiodone_worker, NULL, 0, 0, 0))
    217 			panic("aiodoned");
    218 	}
    219 
    220 	rumpuser_gethostname(hostname, MAXHOSTNAMELEN, &error);
    221 	hostnamelen = strlen(hostname);
    222 
    223 	sigemptyset(&sigcantmask);
    224 
    225 	lwp0.l_fd = proc0.p_fd = fd_init(&rump_filedesc0);
    226 
    227 #ifdef RUMP_USE_REAL_ALLOCATORS
    228 	if (rump_threads)
    229 		vmem_rehash_start();
    230 #endif
    231 
    232 	return 0;
    233 }
    234 
    235 struct uio *
    236 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
    237 {
    238 	struct uio *uio;
    239 	enum uio_rw uiorw;
    240 
    241 	switch (rw) {
    242 	case RUMPUIO_READ:
    243 		uiorw = UIO_READ;
    244 		break;
    245 	case RUMPUIO_WRITE:
    246 		uiorw = UIO_WRITE;
    247 		break;
    248 	default:
    249 		panic("%s: invalid rw %d", __func__, rw);
    250 	}
    251 
    252 	uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
    253 	uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
    254 
    255 	uio->uio_iov->iov_base = buf;
    256 	uio->uio_iov->iov_len = bufsize;
    257 
    258 	uio->uio_iovcnt = 1;
    259 	uio->uio_offset = offset;
    260 	uio->uio_resid = bufsize;
    261 	uio->uio_rw = uiorw;
    262 	uio->uio_vmspace = UIO_VMSPACE_SYS;
    263 
    264 	return uio;
    265 }
    266 
    267 size_t
    268 rump_uio_getresid(struct uio *uio)
    269 {
    270 
    271 	return uio->uio_resid;
    272 }
    273 
    274 off_t
    275 rump_uio_getoff(struct uio *uio)
    276 {
    277 
    278 	return uio->uio_offset;
    279 }
    280 
    281 size_t
    282 rump_uio_free(struct uio *uio)
    283 {
    284 	size_t resid;
    285 
    286 	resid = uio->uio_resid;
    287 	kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
    288 	kmem_free(uio, sizeof(*uio));
    289 
    290 	return resid;
    291 }
    292 
    293 struct lwp *
    294 rump_setup_curlwp(pid_t pid, lwpid_t lid, int set)
    295 {
    296 	struct lwp *l;
    297 	struct proc *p;
    298 
    299 	l = kmem_zalloc(sizeof(struct lwp), KM_SLEEP);
    300 	if (pid != 0) {
    301 		p = kmem_zalloc(sizeof(struct proc), KM_SLEEP);
    302 		rump_proc_vfs_init(p);
    303 		p->p_stats = &rump_stats;
    304 		p->p_limit = &rump_limits;
    305 		p->p_pid = pid;
    306 		p->p_vmspace = &rump_vmspace;
    307 		p->p_fd = fd_init(NULL);
    308 	} else {
    309 		p = &proc0;
    310 	}
    311 
    312 	l->l_cred = rump_cred_suserget();
    313 	l->l_proc = p;
    314 	l->l_lid = lid;
    315 	l->l_fd = p->p_fd;
    316 	l->l_mutex = RUMP_LMUTEX_MAGIC;
    317 	l->l_cpu = &rump_cpu;
    318 
    319 	if (set)
    320 		rumpuser_set_curlwp(l);
    321 
    322 	return l;
    323 }
    324 
    325 void
    326 rump_clear_curlwp()
    327 {
    328 	struct lwp *l;
    329 
    330 	l = rumpuser_get_curlwp();
    331 	if (l->l_proc->p_pid != 0) {
    332 		fd_free();
    333 		rump_proc_vfs_release(l->l_proc);
    334 		rump_cred_destroy(l->l_cred);
    335 		kmem_free(l->l_proc, sizeof(*l->l_proc));
    336 	}
    337 	kmem_free(l, sizeof(*l));
    338 	rumpuser_set_curlwp(NULL);
    339 }
    340 
    341 struct lwp *
    342 rump_get_curlwp()
    343 {
    344 	struct lwp *l;
    345 
    346 	l = rumpuser_get_curlwp();
    347 	if (l == NULL)
    348 		l = &lwp0;
    349 
    350 	return l;
    351 }
    352 
    353 int
    354 rump_splfoo()
    355 {
    356 
    357 	if (rumpuser_whatis_ipl() != RUMPUSER_IPL_INTR) {
    358 		rumpuser_rw_enter(&rumpspl, 0);
    359 		rumpuser_set_ipl(RUMPUSER_IPL_SPLFOO);
    360 	}
    361 
    362 	return 0;
    363 }
    364 
    365 void
    366 rump_intr_enter(void)
    367 {
    368 
    369 	rumpuser_set_ipl(RUMPUSER_IPL_INTR);
    370 	rumpuser_rw_enter(&rumpspl, 1);
    371 }
    372 
    373 void
    374 rump_intr_exit(void)
    375 {
    376 
    377 	rumpuser_rw_exit(&rumpspl);
    378 	rumpuser_clear_ipl(RUMPUSER_IPL_INTR);
    379 }
    380 
    381 void
    382 rump_splx(int dummy)
    383 {
    384 
    385 	if (rumpuser_whatis_ipl() != RUMPUSER_IPL_INTR) {
    386 		rumpuser_clear_ipl(RUMPUSER_IPL_SPLFOO);
    387 		rumpuser_rw_exit(&rumpspl);
    388 	}
    389 }
    390 
    391 kauth_cred_t
    392 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
    393 {
    394 	kauth_cred_t cred;
    395 	int rv;
    396 
    397 	cred = kauth_cred_alloc();
    398 	kauth_cred_setuid(cred, uid);
    399 	kauth_cred_seteuid(cred, uid);
    400 	kauth_cred_setsvuid(cred, uid);
    401 	kauth_cred_setgid(cred, gid);
    402 	kauth_cred_setgid(cred, gid);
    403 	kauth_cred_setegid(cred, gid);
    404 	kauth_cred_setsvgid(cred, gid);
    405 	rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
    406 	/* oh this is silly.  and by "this" I mean kauth_cred_setgroups() */
    407 	assert(rv == 0);
    408 
    409 	return cred;
    410 }
    411 
    412 void
    413 rump_cred_destroy(kauth_cred_t cred)
    414 {
    415 
    416 	kauth_cred_free(cred);
    417 }
    418 
    419 kauth_cred_t
    420 rump_cred_suserget()
    421 {
    422 
    423 	kauth_cred_hold(rump_susercred);
    424 	return rump_susercred;
    425 }
    426 
    427 /* XXX: if they overflow, we're screwed */
    428 lwpid_t
    429 rump_nextlid()
    430 {
    431 	static unsigned lwpid = 2;
    432 
    433 	do {
    434 		lwpid = atomic_inc_uint_nv(&lwpid);
    435 	} while (lwpid == 0);
    436 
    437 	return (lwpid_t)lwpid;
    438 }
    439 
    440 int
    441 rump_module_load(struct modinfo **mi)
    442 {
    443 
    444 	if (!module_compatible((*mi)->mi_version, __NetBSD_Version__))
    445 		return EPROGMISMATCH;
    446 
    447 	return (*mi)->mi_modcmd(MODULE_CMD_INIT, NULL);
    448 }
    449 
    450 int _syspuffs_stub(int, int *);
    451 int
    452 _syspuffs_stub(int fd, int *newfd)
    453 {
    454 
    455 	return ENODEV;
    456 }
    457 __weak_alias(rump_syspuffs_glueinit,_syspuffs_stub);
    458