streams.c revision 53000
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 53000 1999-11-08 07:44:01Z phk $ 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); 191 192/* 193 * We only need open() and close() routines. open() calls socreate() 194 * to allocate a "real" object behind the stream and mallocs some state 195 * info for use by the svr4 emulator; close() deallocates the state 196 * information and passes the underlying object to the normal socket close 197 * routine. 198 */ 199static int 200streamsopen(dev_t dev, int oflags, int devtype, struct proc *p) 201{ 202 int type, protocol; 203 int fd; 204 struct file *fp; 205 struct socket *so; 206 int error; 207 int family; 208 209 if (p->p_dupfd >= 0) 210 return ENODEV; 211 212 switch (minor(dev)) { 213 case dev_udp: 214 family = AF_INET; 215 type = SOCK_DGRAM; 216 protocol = IPPROTO_UDP; 217 break; 218 219 case dev_tcp: 220 family = AF_INET; 221 type = SOCK_STREAM; 222 protocol = IPPROTO_TCP; 223 break; 224 225 case dev_ip: 226 case dev_rawip: 227 family = AF_INET; 228 type = SOCK_RAW; 229 protocol = IPPROTO_IP; 230 break; 231 232 case dev_icmp: 233 family = AF_INET; 234 type = SOCK_RAW; 235 protocol = IPPROTO_ICMP; 236 break; 237 238 case dev_unix_dgram: 239 family = AF_LOCAL; 240 type = SOCK_DGRAM; 241 protocol = 0; 242 break; 243 244 case dev_unix_stream: 245 case dev_unix_ord_stream: 246 family = AF_LOCAL; 247 type = SOCK_STREAM; 248 protocol = 0; 249 break; 250 251 case dev_ptm: 252 return svr4_ptm_alloc(p); 253 254 default: 255 return EOPNOTSUPP; 256 } 257 258 if ((error = falloc(p, &fp, &fd)) != 0) 259 return error; 260 261 if ((error = socreate(family, &so, type, protocol, p)) != 0) { 262 p->p_fd->fd_ofiles[fd] = 0; 263 ffree(fp); 264 return error; 265 } 266 267 fp->f_data = (caddr_t)so; 268 fp->f_flag = FREAD|FWRITE; 269 fp->f_ops = &svr4_netops; 270 fp->f_type = DTYPE_SOCKET; 271 272 (void)svr4_stream_get(fp); 273 p->p_dupfd = fd; 274 return ENXIO; 275} 276 277static int 278svr4_ptm_alloc(p) 279 struct proc *p; 280{ 281 /* 282 * XXX this is very, very ugly. But I can't find a better 283 * way that won't duplicate a big amount of code from 284 * sys_open(). Ho hum... 285 * 286 * Fortunately for us, Solaris (at least 2.5.1) makes the 287 * /dev/ptmx open automatically just open a pty, that (after 288 * STREAMS I_PUSHes), is just a plain pty. fstat() is used 289 * to get the minor device number to map to a tty. 290 * 291 * Cycle through the names. If sys_open() returns ENOENT (or 292 * ENXIO), short circuit the cycle and exit. 293 */ 294 static char ptyname[] = "/dev/ptyXX"; 295 static char ttyletters[] = "pqrstuwxyzPQRST"; 296 static char ttynumbers[] = "0123456789abcdef"; 297 caddr_t sg = stackgap_init(); 298 char *path = stackgap_alloc(&sg, sizeof(ptyname)); 299 struct open_args oa; 300 int l = 0, n = 0; 301 register_t fd = -1; 302 int error; 303 304 SCARG(&oa, path) = path; 305 SCARG(&oa, flags) = O_RDWR; 306 SCARG(&oa, mode) = 0; 307 308 while (fd == -1) { 309 ptyname[8] = ttyletters[l]; 310 ptyname[9] = ttynumbers[n]; 311 312 if ((error = copyout(ptyname, path, sizeof(ptyname))) != 0) 313 return error; 314 315 switch (error = open(p, &oa)) { 316 case ENOENT: 317 case ENXIO: 318 return error; 319 case 0: 320 p->p_dupfd = p->p_retval[0]; 321 return ENXIO; 322 default: 323 if (ttynumbers[++n] == '\0') { 324 if (ttyletters[++l] == '\0') 325 break; 326 n = 0; 327 } 328 } 329 } 330 return ENOENT; 331} 332 333 334struct svr4_strm * 335svr4_stream_get(fp) 336 struct file *fp; 337{ 338 struct socket *so; 339 struct svr4_strm *st; 340 341 if (fp == NULL || fp->f_type != DTYPE_SOCKET) 342 return NULL; 343 344 so = (struct socket *) fp->f_data; 345 346 if (so->so_emuldata) 347 return so->so_emuldata; 348 349 /* Allocate a new one. */ 350 st = malloc(sizeof(struct svr4_strm), M_TEMP, M_WAITOK); 351 st->s_family = so->so_proto->pr_domain->dom_family; 352 st->s_cmd = ~0; 353 st->s_afd = -1; 354 st->s_eventmask = 0; 355 so->so_emuldata = st; 356 fp->f_ops = &svr4_netops; 357 358 return st; 359} 360 361void 362svr4_delete_socket(p, fp) 363 struct proc *p; 364 struct file *fp; 365{ 366 struct svr4_sockcache_entry *e; 367 void *cookie = ((struct socket *) fp->f_data)->so_emuldata; 368 369 if (!svr4_str_initialized) { 370 TAILQ_INIT(&svr4_head); 371 svr4_str_initialized = 1; 372 return; 373 } 374 375 for (e = svr4_head.tqh_first; e != NULL; e = e->entries.tqe_next) 376 if (e->p == p && e->cookie == cookie) { 377 TAILQ_REMOVE(&svr4_head, e, entries); 378 DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n", 379 e->sock.sun_path, p, e->dev, e->ino)); 380 free(e, M_TEMP); 381 return; 382 } 383} 384 385static int 386svr4_soo_close(struct file *fp, struct proc *p) 387{ 388 struct socket *so = (struct socket *)fp->f_data; 389 390 /* CHECKUNIT_DIAG(ENXIO);*/ 391 392 svr4_delete_socket(p, fp); 393 free(so->so_emuldata, M_TEMP); 394 return soo_close(fp, p); 395 return (0); 396} 397