streams.c revision 60060
1/* 2 * Copyright (c) 1998 Mark Newton 3 * Copyright (c) 1994 Christos Zoulas 4 * Copyright (c) 1997 Todd Vierling 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The names of the authors may not be used to endorse or promote products 16 * derived from this software without specific prior written permission 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * Stolen from NetBSD /sys/compat/svr4/svr4_net.c. Pseudo-device driver 30 * skeleton produced from /usr/share/examples/drivers/make_pseudo_driver.sh 31 * in 3.0-980524-SNAP then hacked a bit (but probably not enough :-). 32 * 33 * $FreeBSD: head/sys/dev/streams/streams.c 60060 2000-05-06 01:39:45Z green $ 34 */ 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/kernel.h> /* SYSINIT stuff */ 39#include <sys/conf.h> /* cdevsw stuff */ 40#include <sys/malloc.h> /* malloc region definitions */ 41#include <sys/file.h> 42#include <sys/filedesc.h> 43#include <sys/unistd.h> 44#include <sys/fcntl.h> 45#include <sys/socket.h> 46#include <sys/protosw.h> 47#include <sys/socketvar.h> 48#include <sys/un.h> 49#include <sys/domain.h> 50#include <net/if.h> 51#include <netinet/in.h> 52#include <sys/proc.h> 53#include <sys/uio.h> 54 55#include <sys/sysproto.h> 56 57#include <svr4/svr4_types.h> 58#include <svr4/svr4_util.h> 59#include <svr4/svr4_signal.h> 60#include <svr4/svr4_ioctl.h> 61#include <svr4/svr4_stropts.h> 62#include <svr4/svr4_socket.h> 63 64static int svr4_soo_close __P((struct file *, struct proc *)); 65static int svr4_ptm_alloc __P((struct proc *)); 66static d_open_t streamsopen; 67 68struct svr4_sockcache_entry { 69 struct proc *p; /* Process for the socket */ 70 void *cookie; /* Internal cookie used for matching */ 71 struct sockaddr_un sock;/* Pathname for the socket */ 72 dev_t dev; /* Device where the socket lives on */ 73 ino_t ino; /* Inode where the socket lives on */ 74 TAILQ_ENTRY(svr4_sockcache_entry) entries; 75}; 76 77TAILQ_HEAD(svr4_sockcache_head, svr4_sockcache_entry) svr4_head; 78 79/* Initialization flag (set/queried by svr4_mod LKM) */ 80int svr4_str_initialized = 0; 81 82/* 83 * Device minor numbers 84 */ 85enum { 86 dev_ptm = 10, 87 dev_arp = 26, 88 dev_icmp = 27, 89 dev_ip = 28, 90 dev_tcp = 35, 91 dev_udp = 36, 92 dev_rawip = 37, 93 dev_unix_dgram = 38, 94 dev_unix_stream = 39, 95 dev_unix_ord_stream = 40 96}; 97 98dev_t dt_ptm, dt_arp, dt_icmp, dt_ip, dt_tcp, dt_udp, dt_rawip, 99 dt_unix_dgram, dt_unix_stream, dt_unix_ord_stream; 100 101static struct fileops svr4_netops = { 102 soo_read, soo_write, soo_ioctl, soo_poll, soo_stat, svr4_soo_close 103}; 104 105#define CDEV_MAJOR 103 106static struct cdevsw streams_cdevsw = { 107 /* open */ streamsopen, 108 /* close */ noclose, 109 /* read */ noread, 110 /* write */ nowrite, 111 /* ioctl */ noioctl, 112 /* poll */ nopoll, 113 /* mmap */ nommap, 114 /* strategy */ nostrategy, 115 /* name */ "streams", 116 /* maj */ CDEV_MAJOR, 117 /* dump */ nodump, 118 /* psize */ nopsize, 119 /* flags */ 0, 120 /* bmaj */ -1 121}; 122 123struct streams_softc { 124 struct isa_device *dev; 125} ; 126 127#define UNIT(dev) minor(dev) /* assume one minor number per unit */ 128 129typedef struct streams_softc *sc_p; 130 131static int 132streams_modevent(module_t mod, int type, void *unused) 133{ 134 switch (type) { 135 case MOD_LOAD: 136 /* XXX should make sure it isn't already loaded first */ 137 dt_ptm = make_dev(&streams_cdevsw, dev_ptm, 0, 0, 0666, 138 "ptm"); 139 dt_arp = make_dev(&streams_cdevsw, dev_arp, 0, 0, 0666, 140 "arp"); 141 dt_icmp = make_dev(&streams_cdevsw, dev_icmp, 0, 0, 0666, 142 "icmp"); 143 dt_ip = make_dev(&streams_cdevsw, dev_ip, 0, 0, 0666, 144 "ip"); 145 dt_tcp = make_dev(&streams_cdevsw, dev_tcp, 0, 0, 0666, 146 "tcp"); 147 dt_udp = make_dev(&streams_cdevsw, dev_udp, 0, 0, 0666, 148 "udp"); 149 dt_rawip = make_dev(&streams_cdevsw, dev_rawip, 0, 0, 0666, 150 "rawip"); 151 dt_unix_dgram = make_dev(&streams_cdevsw, dev_unix_dgram, 152 0, 0, 0666, "ticlts"); 153 dt_unix_stream = make_dev(&streams_cdevsw, dev_unix_stream, 154 0, 0, 0666, "ticots"); 155 dt_unix_ord_stream = make_dev(&streams_cdevsw, 156 dev_unix_ord_stream, 0, 0, 0666, "ticotsord"); 157 158 if (! (dt_ptm && dt_arp && dt_icmp && dt_ip && dt_tcp && 159 dt_udp && dt_rawip && dt_unix_dgram && 160 dt_unix_stream && dt_unix_ord_stream)) { 161 printf("WARNING: device config for STREAMS failed\n"); 162 printf("Suggest unloading streams KLD\n"); 163 } 164 return 0; 165 case MOD_UNLOAD: 166 /* XXX should check to see if it's busy first */ 167 destroy_dev(dt_ptm); 168 destroy_dev(dt_arp); 169 destroy_dev(dt_icmp); 170 destroy_dev(dt_ip); 171 destroy_dev(dt_tcp); 172 destroy_dev(dt_udp); 173 destroy_dev(dt_rawip); 174 destroy_dev(dt_unix_dgram); 175 destroy_dev(dt_unix_stream); 176 destroy_dev(dt_unix_ord_stream); 177 178 return 0; 179 default: 180 break; 181 } 182 return 0; 183} 184 185static moduledata_t streams_mod = { 186 "streams", 187 streams_modevent, 188 0 189}; 190DECLARE_MODULE(streams, streams_mod, SI_SUB_DRIVERS, SI_ORDER_ANY); 191MODULE_VERSION(streams, 1); 192 193/* 194 * We only need open() and close() routines. open() calls socreate() 195 * to allocate a "real" object behind the stream and mallocs some state 196 * info for use by the svr4 emulator; close() deallocates the state 197 * information and passes the underlying object to the normal socket close 198 * routine. 199 */ 200static int 201streamsopen(dev_t dev, int oflags, int devtype, struct proc *p) 202{ 203 int type, protocol; 204 int fd; 205 struct file *fp; 206 struct socket *so; 207 int error; 208 int family; 209 210 if (p->p_dupfd >= 0) 211 return ENODEV; 212 213 switch (minor(dev)) { 214 case dev_udp: 215 family = AF_INET; 216 type = SOCK_DGRAM; 217 protocol = IPPROTO_UDP; 218 break; 219 220 case dev_tcp: 221 family = AF_INET; 222 type = SOCK_STREAM; 223 protocol = IPPROTO_TCP; 224 break; 225 226 case dev_ip: 227 case dev_rawip: 228 family = AF_INET; 229 type = SOCK_RAW; 230 protocol = IPPROTO_IP; 231 break; 232 233 case dev_icmp: 234 family = AF_INET; 235 type = SOCK_RAW; 236 protocol = IPPROTO_ICMP; 237 break; 238 239 case dev_unix_dgram: 240 family = AF_LOCAL; 241 type = SOCK_DGRAM; 242 protocol = 0; 243 break; 244 245 case dev_unix_stream: 246 case dev_unix_ord_stream: 247 family = AF_LOCAL; 248 type = SOCK_STREAM; 249 protocol = 0; 250 break; 251 252 case dev_ptm: 253 return svr4_ptm_alloc(p); 254 255 default: 256 return EOPNOTSUPP; 257 } 258 259 if ((error = falloc(p, &fp, &fd)) != 0) 260 return error; 261 262 if ((error = socreate(family, &so, type, protocol, p)) != 0) { 263 p->p_fd->fd_ofiles[fd] = 0; 264 ffree(fp); 265 return error; 266 } 267 268 fp->f_data = (caddr_t)so; 269 fp->f_flag = FREAD|FWRITE; 270 fp->f_ops = &svr4_netops; 271 fp->f_type = DTYPE_SOCKET; 272 273 (void)svr4_stream_get(fp); 274 p->p_dupfd = fd; 275 return ENXIO; 276} 277 278static int 279svr4_ptm_alloc(p) 280 struct proc *p; 281{ 282 /* 283 * XXX this is very, very ugly. But I can't find a better 284 * way that won't duplicate a big amount of code from 285 * sys_open(). Ho hum... 286 * 287 * Fortunately for us, Solaris (at least 2.5.1) makes the 288 * /dev/ptmx open automatically just open a pty, that (after 289 * STREAMS I_PUSHes), is just a plain pty. fstat() is used 290 * to get the minor device number to map to a tty. 291 * 292 * Cycle through the names. If sys_open() returns ENOENT (or 293 * ENXIO), short circuit the cycle and exit. 294 */ 295 static char ptyname[] = "/dev/ptyXX"; 296 static char ttyletters[] = "pqrstuwxyzPQRST"; 297 static char ttynumbers[] = "0123456789abcdef"; 298 caddr_t sg = stackgap_init(); 299 char *path = stackgap_alloc(&sg, sizeof(ptyname)); 300 struct open_args oa; 301 int l = 0, n = 0; 302 register_t fd = -1; 303 int error; 304 305 SCARG(&oa, path) = path; 306 SCARG(&oa, flags) = O_RDWR; 307 SCARG(&oa, mode) = 0; 308 309 while (fd == -1) { 310 ptyname[8] = ttyletters[l]; 311 ptyname[9] = ttynumbers[n]; 312 313 if ((error = copyout(ptyname, path, sizeof(ptyname))) != 0) 314 return error; 315 316 switch (error = open(p, &oa)) { 317 case ENOENT: 318 case ENXIO: 319 return error; 320 case 0: 321 p->p_dupfd = p->p_retval[0]; 322 return ENXIO; 323 default: 324 if (ttynumbers[++n] == '\0') { 325 if (ttyletters[++l] == '\0') 326 break; 327 n = 0; 328 } 329 } 330 } 331 return ENOENT; 332} 333 334 335struct svr4_strm * 336svr4_stream_get(fp) 337 struct file *fp; 338{ 339 struct socket *so; 340 struct svr4_strm *st; 341 342 if (fp == NULL || fp->f_type != DTYPE_SOCKET) 343 return NULL; 344 345 so = (struct socket *) fp->f_data; 346 347 if (so->so_emuldata) 348 return so->so_emuldata; 349 350 /* Allocate a new one. */ 351 st = malloc(sizeof(struct svr4_strm), M_TEMP, M_WAITOK); 352 st->s_family = so->so_proto->pr_domain->dom_family; 353 st->s_cmd = ~0; 354 st->s_afd = -1; 355 st->s_eventmask = 0; 356 so->so_emuldata = st; 357 fp->f_ops = &svr4_netops; 358 359 return st; 360} 361 362void 363svr4_delete_socket(p, fp) 364 struct proc *p; 365 struct file *fp; 366{ 367 struct svr4_sockcache_entry *e; 368 void *cookie = ((struct socket *) fp->f_data)->so_emuldata; 369 370 if (!svr4_str_initialized) { 371 TAILQ_INIT(&svr4_head); 372 svr4_str_initialized = 1; 373 return; 374 } 375 376 for (e = svr4_head.tqh_first; e != NULL; e = e->entries.tqe_next) 377 if (e->p == p && e->cookie == cookie) { 378 TAILQ_REMOVE(&svr4_head, e, entries); 379 DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n", 380 e->sock.sun_path, p, e->dev, e->ino)); 381 free(e, M_TEMP); 382 return; 383 } 384} 385 386static int 387svr4_soo_close(struct file *fp, struct proc *p) 388{ 389 struct socket *so = (struct socket *)fp->f_data; 390 391 /* CHECKUNIT_DIAG(ENXIO);*/ 392 393 svr4_delete_socket(p, fp); 394 free(so->so_emuldata, M_TEMP); 395 return soo_close(fp, p); 396 return (0); 397} 398