1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <sys/types.h> 28 #include <inet/ip.h> 29 #include <inet/ip_impl.h> 30 #include <inet/ipclassifier.h> 31 #include <inet/proto_set.h> 32 #include <sys/stream.h> 33 #include <sys/strsubr.h> 34 #include <sys/strsun.h> 35 #include <sys/cmn_err.h> 36 #include <sys/t_kuser.h> 37 #include <sys/tihdr.h> 38 #include <sys/pathname.h> 39 #include <sys/sockio.h> 40 #include <sys/vmem.h> 41 #include <sys/disp.h> 42 43 void ip_helper_wput(queue_t *q, mblk_t *mp); 44 45 static int ip_helper_stream_close(queue_t *, int); 46 47 static struct module_info ip_helper_stream_info = { 48 0, "iphelper", IP_MOD_MINPSZ, IP_MOD_MAXPSZ, IP_MOD_HIWAT, IP_MOD_LOWAT 49 }; 50 51 static struct qinit ip_helper_stream_rinit = { 52 NULL, NULL, NULL, ip_helper_stream_close, NULL, 53 &ip_helper_stream_info, NULL 54 }; 55 56 static struct qinit ip_helper_stream_winit = { 57 (pfi_t)ip_helper_wput, (pfi_t)ip_wsrv, NULL, NULL, NULL, 58 &ip_helper_stream_info, NULL, NULL, NULL, STRUIOT_NONE 59 }; 60 61 #define IP_USE_HELPER_CACHE (ip_helper_stream_cache != NULL) 62 63 /* 64 * set the q_ptr of the 'q' to the conn_t pointer passed in 65 */ 66 static void 67 ip_helper_share_conn(queue_t *q, mblk_t *mp) 68 { 69 if (IP_USE_HELPER_CACHE) { 70 ip_helper_stream_info_t *ip_helper_info; 71 72 ip_helper_info = *((ip_helper_stream_info_t **) 73 mp->b_cont->b_rptr); 74 ip_helper_info->iphs_minfo = q->q_ptr; 75 ip_helper_info->iphs_rq = RD(q); 76 ip_helper_info->iphs_wq = WR(q); 77 } else { 78 conn_t *connp = *((conn_t **)mp->b_cont->b_rptr); 79 80 connp->conn_helper_info->iphs_minfo = q->q_ptr; 81 connp->conn_helper_info->iphs_rq = RD(q); 82 connp->conn_helper_info->iphs_wq = WR(q); 83 WR(q)->q_ptr = RD(q)->q_ptr = (void *)connp; 84 connp->conn_rq = RD(q); 85 connp->conn_wq = WR(q); 86 } 87 miocack(q, mp, 0, 0); 88 } 89 90 void 91 ip_helper_wput(queue_t *q, mblk_t *mp) 92 { 93 struct iocblk *iocp = (struct iocblk *)mp->b_rptr; 94 if (DB_TYPE(mp) == M_IOCTL && 95 iocp->ioc_cmd == SIOCSQPTR) { 96 ip_helper_share_conn(q, mp); 97 } else { 98 conn_t *connp = (conn_t *)q->q_ptr; 99 100 if (connp->conn_af_isv6) { 101 ip_wput_v6(q, mp); 102 } else { 103 ip_wput(q, mp); 104 } 105 } 106 } 107 108 /* ARGSUSED */ 109 int 110 ip_helper_stream_setup(queue_t *q, dev_t *devp, int flag, int sflag, 111 cred_t *credp, boolean_t isv6) 112 { 113 major_t maj; 114 ip_helper_minfo_t *ip_minfop; 115 116 ASSERT((flag & ~(FKLYR)) == IP_HELPER_STR); 117 118 ASSERT(RD(q) == q); 119 120 ip_minfop = kmem_alloc(sizeof (ip_helper_minfo_t), KM_NOSLEEP); 121 if (ip_minfop == NULL) { 122 return (ENOMEM); 123 } 124 125 ip_minfop->ip_minfo_dev = 0; 126 ip_minfop->ip_minfo_arena = NULL; 127 128 /* 129 * Clone the device, allocate minor device number 130 */ 131 if (ip_minor_arena_la != NULL) 132 ip_minfop->ip_minfo_dev = inet_minor_alloc(ip_minor_arena_la); 133 134 if (ip_minfop->ip_minfo_dev == 0) { 135 /* 136 * numbers in the large arena are exhausted 137 * Try small arena. 138 * Or this is a 32 bit system, 32 bit systems do not have 139 * ip_minor_arena_la 140 */ 141 ip_minfop->ip_minfo_dev = inet_minor_alloc(ip_minor_arena_sa); 142 if (ip_minfop->ip_minfo_dev == 0) { 143 return (EBUSY); 144 } 145 ip_minfop->ip_minfo_arena = ip_minor_arena_sa; 146 } else { 147 ip_minfop->ip_minfo_arena = ip_minor_arena_la; 148 } 149 150 151 ASSERT(ip_minfop->ip_minfo_dev != 0); 152 ASSERT(ip_minfop->ip_minfo_arena != NULL); 153 154 RD(q)->q_ptr = WR(q)->q_ptr = ip_minfop; 155 156 maj = getemajor(*devp); 157 *devp = makedevice(maj, (ulong_t)(ip_minfop->ip_minfo_dev)); 158 159 q->q_qinfo = &ip_helper_stream_rinit; 160 WR(q)->q_qinfo = &ip_helper_stream_winit; 161 qprocson(q); 162 return (0); 163 } 164 165 /* ARGSUSED */ 166 static int 167 ip_helper_stream_close(queue_t *q, int flag) 168 { 169 ip_helper_minfo_t *ip_minfop; 170 171 qprocsoff(q); 172 ip_minfop = (q)->q_ptr; 173 inet_minor_free(ip_minfop->ip_minfo_arena, 174 ip_minfop->ip_minfo_dev); 175 kmem_free(ip_minfop, sizeof (ip_helper_minfo_t)); 176 RD(q)->q_ptr = NULL; 177 WR(q)->q_ptr = NULL; 178 return (0); 179 } 180 181 /* 182 * Public interface for creating an IP stream with shared conn_t 183 */ 184 /* ARGSUSED */ 185 int 186 ip_create_helper_stream(conn_t *connp, ldi_ident_t li) 187 { 188 int error; 189 int ret; 190 191 ASSERT(!servicing_interrupt()); 192 193 error = 0; 194 if (IP_USE_HELPER_CACHE) { 195 queue_t *rq, *wq; 196 197 connp->conn_helper_info = kmem_cache_alloc( 198 ip_helper_stream_cache, KM_NOSLEEP); 199 if (connp->conn_helper_info == NULL) 200 return (EAGAIN); 201 rq = connp->conn_helper_info->iphs_rq; 202 wq = connp->conn_helper_info->iphs_wq; 203 /* 204 * Doesn't need to hold the QLOCK for there is no one else 205 * should have a pointer to this queue. 206 */ 207 rq->q_flag |= QWANTR; 208 wq->q_flag |= QWANTR; 209 210 connp->conn_rq = rq; 211 connp->conn_wq = wq; 212 rq->q_ptr = (void *)connp; 213 wq->q_ptr = (void *)connp; 214 } else { 215 ASSERT(connp->conn_helper_info == NULL); 216 connp->conn_helper_info = kmem_alloc( 217 sizeof (ip_helper_stream_info_t), KM_SLEEP); 218 /* 219 * open ip device via the layered interface. 220 * pass in kcred as some threads do not have the 221 * priviledge to open /dev/ip and the check in 222 * secpolicy_spec_open() will fail the open 223 */ 224 error = ldi_open_by_name(connp->conn_af_isv6 ? 225 DEV_IP6 : DEV_IP, IP_HELPER_STR, 226 kcred, &connp->conn_helper_info->iphs_handle, li); 227 228 if (error != 0) { 229 kmem_free(connp->conn_helper_info, 230 (sizeof (ip_helper_stream_info_t))); 231 connp->conn_helper_info = NULL; 232 return (error); 233 } 234 /* 235 * Share connp with the helper stream 236 */ 237 error = ldi_ioctl(connp->conn_helper_info->iphs_handle, 238 SIOCSQPTR, (intptr_t)connp, FKIOCTL, kcred, &ret); 239 240 if (error != 0) { 241 /* 242 * Passing in a zero flag indicates that an error 243 * occured and stream was not shared 244 */ 245 (void) ldi_close(connp->conn_helper_info->iphs_handle, 246 0, kcred); 247 kmem_free(connp->conn_helper_info, 248 (sizeof (ip_helper_stream_info_t))); 249 connp->conn_helper_info = NULL; 250 } 251 } 252 return (error); 253 } 254 255 /* 256 * Public interface for closing the shared IP stream 257 */ 258 /* ARGSUSED */ 259 void 260 ip_close_helper_stream(conn_t *connp) 261 { 262 ASSERT(!servicing_interrupt()); 263 if (IP_USE_HELPER_CACHE) { 264 265 if (connp->conn_helper_info == NULL) 266 return; 267 ASSERT(connp->conn_helper_info->iphs_rq != NULL); 268 ASSERT(connp->conn_helper_info->iphs_wq != NULL); 269 270 /* Prevent service procedures from being called */ 271 disable_svc(connp->conn_helper_info->iphs_rq); 272 273 /* Wait until service procedure of each queue is run */ 274 wait_svc(connp->conn_helper_info->iphs_rq); 275 276 /* Cleanup any pending ioctls */ 277 conn_ioctl_cleanup(connp); 278 279 /* Allow service procedures to be called again */ 280 enable_svc(connp->conn_helper_info->iphs_rq); 281 282 /* Flush the queues */ 283 flushq(connp->conn_helper_info->iphs_rq, FLUSHALL); 284 flushq(connp->conn_helper_info->iphs_wq, FLUSHALL); 285 286 connp->conn_helper_info->iphs_rq->q_ptr = NULL; 287 connp->conn_helper_info->iphs_wq->q_ptr = NULL; 288 289 kmem_cache_free(ip_helper_stream_cache, 290 connp->conn_helper_info); 291 } else { 292 ASSERT( 293 connp->conn_helper_info->iphs_handle != NULL); 294 295 connp->conn_helper_info->iphs_rq->q_ptr = 296 connp->conn_helper_info->iphs_wq->q_ptr = 297 connp->conn_helper_info->iphs_minfo; 298 (void) ldi_close(connp->conn_helper_info->iphs_handle, 299 IP_HELPER_STR, kcred); 300 kmem_free(connp->conn_helper_info, 301 sizeof (ip_helper_stream_info_t)); 302 } 303 connp->conn_helper_info = NULL; 304 } 305 306 /* 307 * create a T_SVR4_OPTMGMT_REQ TPI message and send down the IP stream 308 */ 309 static int 310 ip_send_option_request(conn_t *connp, uint_t optset_context, int level, 311 int option_name, const void *optval, t_uscalar_t optlen, cred_t *cr) 312 { 313 struct T_optmgmt_req *optmgmt_reqp; 314 struct opthdr *ohp; 315 ssize_t size; 316 mblk_t *mp; 317 318 size = sizeof (struct T_optmgmt_req) + sizeof (struct opthdr) + optlen; 319 mp = allocb_cred(size, cr); 320 if (mp == NULL) 321 return (ENOMEM); 322 323 mp->b_datap->db_type = M_PROTO; 324 optmgmt_reqp = (struct T_optmgmt_req *)mp->b_wptr; 325 326 optmgmt_reqp->PRIM_type = T_SVR4_OPTMGMT_REQ; 327 optmgmt_reqp->MGMT_flags = optset_context; 328 optmgmt_reqp->OPT_length = (t_scalar_t)sizeof (struct opthdr) + optlen; 329 optmgmt_reqp->OPT_offset = (t_scalar_t)sizeof (struct T_optmgmt_req); 330 331 mp->b_wptr += sizeof (struct T_optmgmt_req); 332 333 ohp = (struct opthdr *)mp->b_wptr; 334 335 ohp->level = level; 336 ohp->name = option_name; 337 ohp->len = optlen; 338 339 mp->b_wptr += sizeof (struct opthdr); 340 341 if (optval != NULL) { 342 bcopy(optval, mp->b_wptr, optlen); 343 } else { 344 bzero(mp->b_wptr, optlen); 345 } 346 mp->b_wptr += optlen; 347 348 /* 349 * Send down the primitive 350 */ 351 return (ldi_putmsg(connp->conn_helper_info->iphs_handle, mp)); 352 } 353 354 /* 355 * wait/process the response to T_SVR4_OPTMGMT_REQ TPI message 356 */ 357 static int 358 ip_get_option_response(conn_t *connp, uint_t optset_context, void *optval, 359 t_uscalar_t *optlenp) 360 { 361 union T_primitives *tpr; 362 int error; 363 mblk_t *mp; 364 365 mp = NULL; 366 367 ASSERT(optset_context == T_CHECK || optset_context == T_NEGOTIATE); 368 error = ldi_getmsg(connp->conn_helper_info->iphs_handle, &mp, NULL); 369 if (error != 0) { 370 return (error); 371 } 372 373 if (DB_TYPE(mp) != M_PCPROTO || MBLKL(mp) < sizeof (tpr->type)) { 374 error = EPROTO; 375 goto done; 376 } 377 378 tpr = (union T_primitives *)mp->b_rptr; 379 380 switch (tpr->type) { 381 case T_OPTMGMT_ACK: 382 if (MBLKL(mp) < TOPTMGMTACKSZ) 383 error = EPROTO; 384 break; 385 case T_ERROR_ACK: 386 if (MBLKL(mp) < TERRORACKSZ) { 387 error = EPROTO; 388 break; 389 } 390 391 if (tpr->error_ack.TLI_error == TSYSERR) 392 error = tpr->error_ack.UNIX_error; 393 else 394 error = proto_tlitosyserr(tpr->error_ack.TLI_error); 395 break; 396 default: 397 error = EPROTO; 398 break; 399 } 400 401 if ((optset_context == T_CHECK) && (error == 0)) { 402 struct opthdr *opt_res; 403 t_uscalar_t len; 404 t_uscalar_t size; 405 t_uscalar_t maxlen = *optlenp; 406 void *option; 407 struct T_optmgmt_ack *optmgmt_ack; 408 409 optmgmt_ack = (struct T_optmgmt_ack *)mp->b_rptr; 410 opt_res = (struct opthdr *) 411 ((uintptr_t)mp->b_rptr + optmgmt_ack->OPT_offset); 412 /* 413 * Check mblk boundary 414 */ 415 if (!MBLKIN(mp, optmgmt_ack->OPT_offset, 416 optmgmt_ack->OPT_length)) { 417 error = EPROTO; 418 goto done; 419 } 420 421 /* 422 * Check alignment 423 */ 424 if ((((uintptr_t)opt_res) & (__TPI_ALIGN_SIZE - 1)) != 0) { 425 error = EPROTO; 426 goto done; 427 } 428 429 option = &opt_res[1]; 430 431 /* check to ensure that the option is within bounds */ 432 if ((((uintptr_t)option + opt_res->len) < (uintptr_t)option) || 433 !MBLKIN(mp, sizeof (struct opthdr), opt_res->len)) { 434 error = EPROTO; 435 goto done; 436 } 437 438 len = opt_res->len; 439 size = MIN(len, maxlen); 440 441 /* 442 * Copy data 443 */ 444 bcopy(option, optval, size); 445 bcopy(&size, optlenp, sizeof (size)); 446 } 447 448 done: 449 freemsg(mp); 450 return (error); 451 } 452 453 /* 454 * Public interface to get socketoptions via the ip helper stream. 455 */ 456 int 457 ip_get_options(conn_t *connp, int level, int option_name, void *optval, 458 t_uscalar_t *optlenp, cred_t *cr) 459 { 460 int error; 461 462 error = ip_send_option_request(connp, T_CHECK, level, option_name, NULL, 463 *optlenp, cr); 464 if (error) 465 return (error); 466 467 return (ip_get_option_response(connp, T_CHECK, optval, optlenp)); 468 } 469 470 /* 471 * Public interface to set socket options via the ip helper stream. 472 */ 473 int 474 ip_set_options(conn_t *connp, int level, int option_name, const void *optval, 475 t_uscalar_t optlen, cred_t *cr) 476 { 477 478 int error; 479 480 error = ip_send_option_request(connp, T_NEGOTIATE, level, option_name, 481 optval, optlen, cr); 482 if (error) 483 return (error); 484 485 return (ip_get_option_response(connp, T_NEGOTIATE, (void *)optval, 486 &optlen)); 487 } 488