1 /* $NetBSD: ddp_usrreq.c,v 1.38 2009/03/18 16:00:22 cegger Exp $ */ 2 3 /* 4 * Copyright (c) 1990,1991 Regents of The University of Michigan. 5 * All Rights Reserved. 6 * 7 * Permission to use, copy, modify, and distribute this software and 8 * its documentation for any purpose and without fee is hereby granted, 9 * provided that the above copyright notice appears in all copies and 10 * that both that copyright notice and this permission notice appear 11 * in supporting documentation, and that the name of The University 12 * of Michigan not be used in advertising or publicity pertaining to 13 * distribution of the software without specific, written prior 14 * permission. This software is supplied as is without expressed or 15 * implied warranties of any kind. 16 * 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 20 * Research Systems Unix Group 21 * The University of Michigan 22 * c/o Wesley Craig 23 * 535 W. William Street 24 * Ann Arbor, Michigan 25 * +1-313-764-2278 26 * netatalk@umich.edu 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: ddp_usrreq.c,v 1.38 2009/03/18 16:00:22 cegger Exp $"); 31 32 #include "opt_mbuftrace.h" 33 34 #include <sys/param.h> 35 #include <sys/errno.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/mbuf.h> 39 #include <sys/ioctl.h> 40 #include <sys/queue.h> 41 #include <sys/socket.h> 42 #include <sys/socketvar.h> 43 #include <sys/protosw.h> 44 #include <sys/kauth.h> 45 #include <sys/sysctl.h> 46 #include <net/if.h> 47 #include <net/route.h> 48 #include <net/if_ether.h> 49 #include <net/net_stats.h> 50 #include <netinet/in.h> 51 52 #include <netatalk/at.h> 53 #include <netatalk/at_var.h> 54 #include <netatalk/ddp_var.h> 55 #include <netatalk/ddp_private.h> 56 #include <netatalk/aarp.h> 57 #include <netatalk/at_extern.h> 58 59 static void at_pcbdisconnect(struct ddpcb *); 60 static void at_sockaddr(struct ddpcb *, struct mbuf *); 61 static int at_pcbsetaddr(struct ddpcb *, struct mbuf *, struct lwp *); 62 static int at_pcbconnect(struct ddpcb *, struct mbuf *, struct lwp *); 63 static void at_pcbdetach(struct socket *, struct ddpcb *); 64 static int at_pcballoc(struct socket *); 65 66 struct ifqueue atintrq1, atintrq2; 67 struct ddpcb *ddp_ports[ATPORT_LAST]; 68 struct ddpcb *ddpcb = NULL; 69 percpu_t *ddpstat_percpu; 70 struct at_ifaddrhead at_ifaddr; /* Here as inited in this file */ 71 u_long ddp_sendspace = DDP_MAXSZ; /* Max ddp size + 1 (ddp_type) */ 72 u_long ddp_recvspace = 25 * (587 + sizeof(struct sockaddr_at)); 73 74 #ifdef MBUFTRACE 75 struct mowner atalk_rx_mowner = MOWNER_INIT("atalk", "rx"); 76 struct mowner atalk_tx_mowner = MOWNER_INIT("atalk", "tx"); 77 #endif 78 79 /* ARGSUSED */ 80 int 81 ddp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr, struct mbuf *rights, struct lwp *l) 82 { 83 struct ddpcb *ddp; 84 int error = 0; 85 86 ddp = sotoddpcb(so); 87 88 if (req == PRU_CONTROL) { 89 return (at_control((long) m, (void *) addr, 90 (struct ifnet *) rights, l)); 91 } 92 if (req == PRU_PURGEIF) { 93 mutex_enter(softnet_lock); 94 at_purgeif((struct ifnet *) rights); 95 mutex_exit(softnet_lock); 96 return (0); 97 } 98 if (rights && rights->m_len) { 99 error = EINVAL; 100 goto release; 101 } 102 if (ddp == NULL && req != PRU_ATTACH) { 103 error = EINVAL; 104 goto release; 105 } 106 switch (req) { 107 case PRU_ATTACH: 108 if (ddp != NULL) { 109 error = EINVAL; 110 break; 111 } 112 sosetlock(so); 113 if ((error = at_pcballoc(so)) != 0) { 114 break; 115 } 116 error = soreserve(so, ddp_sendspace, ddp_recvspace); 117 break; 118 119 case PRU_DETACH: 120 at_pcbdetach(so, ddp); 121 break; 122 123 case PRU_BIND: 124 error = at_pcbsetaddr(ddp, addr, l); 125 break; 126 127 case PRU_SOCKADDR: 128 at_sockaddr(ddp, addr); 129 break; 130 131 case PRU_CONNECT: 132 if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) { 133 error = EISCONN; 134 break; 135 } 136 error = at_pcbconnect(ddp, addr, l); 137 if (error == 0) 138 soisconnected(so); 139 break; 140 141 case PRU_DISCONNECT: 142 if (ddp->ddp_fsat.sat_addr.s_node == ATADDR_ANYNODE) { 143 error = ENOTCONN; 144 break; 145 } 146 at_pcbdisconnect(ddp); 147 soisdisconnected(so); 148 break; 149 150 case PRU_SHUTDOWN: 151 socantsendmore(so); 152 break; 153 154 case PRU_SEND:{ 155 int s = 0; 156 157 if (addr) { 158 if (ddp->ddp_fsat.sat_port != ATADDR_ANYPORT) { 159 error = EISCONN; 160 break; 161 } 162 s = splnet(); 163 error = at_pcbconnect(ddp, addr, l); 164 if (error) { 165 splx(s); 166 break; 167 } 168 } else { 169 if (ddp->ddp_fsat.sat_port == ATADDR_ANYPORT) { 170 error = ENOTCONN; 171 break; 172 } 173 } 174 175 error = ddp_output(m, ddp); 176 m = NULL; 177 if (addr) { 178 at_pcbdisconnect(ddp); 179 splx(s); 180 } 181 } 182 break; 183 184 case PRU_ABORT: 185 soisdisconnected(so); 186 at_pcbdetach(so, ddp); 187 break; 188 189 case PRU_LISTEN: 190 case PRU_CONNECT2: 191 case PRU_ACCEPT: 192 case PRU_SENDOOB: 193 case PRU_FASTTIMO: 194 case PRU_SLOWTIMO: 195 case PRU_PROTORCV: 196 case PRU_PROTOSEND: 197 error = EOPNOTSUPP; 198 break; 199 200 case PRU_RCVD: 201 case PRU_RCVOOB: 202 /* 203 * Don't mfree. Good architecture... 204 */ 205 return (EOPNOTSUPP); 206 207 case PRU_SENSE: 208 /* 209 * 1. Don't return block size. 210 * 2. Don't mfree. 211 */ 212 return (0); 213 214 default: 215 error = EOPNOTSUPP; 216 } 217 218 release: 219 if (m != NULL) { 220 m_freem(m); 221 } 222 return (error); 223 } 224 225 static void 226 at_sockaddr(struct ddpcb *ddp, struct mbuf *addr) 227 { 228 struct sockaddr_at *sat; 229 230 addr->m_len = sizeof(struct sockaddr_at); 231 sat = mtod(addr, struct sockaddr_at *); 232 *sat = ddp->ddp_lsat; 233 } 234 235 static int 236 at_pcbsetaddr(struct ddpcb *ddp, struct mbuf *addr, struct lwp *l) 237 { 238 struct sockaddr_at lsat, *sat; 239 struct at_ifaddr *aa; 240 struct ddpcb *ddpp; 241 242 if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT) { /* shouldn't be bound */ 243 return (EINVAL); 244 } 245 if (addr != 0) { /* validate passed address */ 246 sat = mtod(addr, struct sockaddr_at *); 247 if (addr->m_len != sizeof(*sat)) 248 return (EINVAL); 249 250 if (sat->sat_family != AF_APPLETALK) 251 return (EAFNOSUPPORT); 252 253 if (sat->sat_addr.s_node != ATADDR_ANYNODE || 254 sat->sat_addr.s_net != ATADDR_ANYNET) { 255 TAILQ_FOREACH(aa, &at_ifaddr, aa_list) { 256 if ((sat->sat_addr.s_net == 257 AA_SAT(aa)->sat_addr.s_net) && 258 (sat->sat_addr.s_node == 259 AA_SAT(aa)->sat_addr.s_node)) 260 break; 261 } 262 if (!aa) 263 return (EADDRNOTAVAIL); 264 } 265 if (sat->sat_port != ATADDR_ANYPORT) { 266 if (sat->sat_port < ATPORT_FIRST || 267 sat->sat_port >= ATPORT_LAST) 268 return (EINVAL); 269 270 if (sat->sat_port < ATPORT_RESERVED && l && 271 kauth_authorize_generic(l->l_cred, 272 KAUTH_GENERIC_ISSUSER, NULL)) 273 return (EACCES); 274 } 275 } else { 276 memset((void *) & lsat, 0, sizeof(struct sockaddr_at)); 277 lsat.sat_len = sizeof(struct sockaddr_at); 278 lsat.sat_addr.s_node = ATADDR_ANYNODE; 279 lsat.sat_addr.s_net = ATADDR_ANYNET; 280 lsat.sat_family = AF_APPLETALK; 281 sat = &lsat; 282 } 283 284 if (sat->sat_addr.s_node == ATADDR_ANYNODE && 285 sat->sat_addr.s_net == ATADDR_ANYNET) { 286 if (TAILQ_EMPTY(&at_ifaddr)) 287 return EADDRNOTAVAIL; 288 sat->sat_addr = AA_SAT(TAILQ_FIRST(&at_ifaddr))->sat_addr; 289 } 290 ddp->ddp_lsat = *sat; 291 292 /* 293 * Choose port. 294 */ 295 if (sat->sat_port == ATADDR_ANYPORT) { 296 for (sat->sat_port = ATPORT_RESERVED; 297 sat->sat_port < ATPORT_LAST; sat->sat_port++) { 298 if (ddp_ports[sat->sat_port - 1] == 0) 299 break; 300 } 301 if (sat->sat_port == ATPORT_LAST) { 302 return (EADDRNOTAVAIL); 303 } 304 ddp->ddp_lsat.sat_port = sat->sat_port; 305 ddp_ports[sat->sat_port - 1] = ddp; 306 } else { 307 for (ddpp = ddp_ports[sat->sat_port - 1]; ddpp; 308 ddpp = ddpp->ddp_pnext) { 309 if (ddpp->ddp_lsat.sat_addr.s_net == 310 sat->sat_addr.s_net && 311 ddpp->ddp_lsat.sat_addr.s_node == 312 sat->sat_addr.s_node) 313 break; 314 } 315 if (ddpp != NULL) 316 return (EADDRINUSE); 317 318 ddp->ddp_pnext = ddp_ports[sat->sat_port - 1]; 319 ddp_ports[sat->sat_port - 1] = ddp; 320 if (ddp->ddp_pnext) 321 ddp->ddp_pnext->ddp_pprev = ddp; 322 } 323 324 return 0; 325 } 326 327 static int 328 at_pcbconnect(struct ddpcb *ddp, struct mbuf *addr, struct lwp *l) 329 { 330 struct rtentry *rt; 331 const struct sockaddr_at *cdst; 332 struct sockaddr_at *sat = mtod(addr, struct sockaddr_at *); 333 struct route *ro; 334 struct at_ifaddr *aa; 335 struct ifnet *ifp; 336 u_short hintnet = 0, net; 337 338 if (addr->m_len != sizeof(*sat)) 339 return EINVAL; 340 if (sat->sat_family != AF_APPLETALK) { 341 return EAFNOSUPPORT; 342 } 343 /* 344 * Under phase 2, network 0 means "the network". We take "the 345 * network" to mean the network the control block is bound to. 346 * If the control block is not bound, there is an error. 347 */ 348 if (sat->sat_addr.s_net == ATADDR_ANYNET 349 && sat->sat_addr.s_node != ATADDR_ANYNODE) { 350 if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) { 351 return EADDRNOTAVAIL; 352 } 353 hintnet = ddp->ddp_lsat.sat_addr.s_net; 354 } 355 ro = &ddp->ddp_route; 356 /* 357 * If we've got an old route for this pcb, check that it is valid. 358 * If we've changed our address, we may have an old "good looking" 359 * route here. Attempt to detect it. 360 */ 361 if ((rt = rtcache_validate(ro)) != NULL || 362 (rt = rtcache_update(ro, 1)) != NULL) { 363 if (hintnet) { 364 net = hintnet; 365 } else { 366 net = sat->sat_addr.s_net; 367 } 368 if ((ifp = rt->rt_ifp) != NULL) { 369 TAILQ_FOREACH(aa, &at_ifaddr, aa_list) { 370 if (aa->aa_ifp == ifp && 371 ntohs(net) >= ntohs(aa->aa_firstnet) && 372 ntohs(net) <= ntohs(aa->aa_lastnet)) { 373 break; 374 } 375 } 376 } else 377 aa = NULL; 378 cdst = satocsat(rtcache_getdst(ro)); 379 if (aa == NULL || (cdst->sat_addr.s_net != 380 (hintnet ? hintnet : sat->sat_addr.s_net) || 381 cdst->sat_addr.s_node != sat->sat_addr.s_node)) { 382 rtcache_free(ro); 383 rt = NULL; 384 } 385 } 386 /* 387 * If we've got no route for this interface, try to find one. 388 */ 389 if (rt == NULL) { 390 union { 391 struct sockaddr dst; 392 struct sockaddr_at dsta; 393 } u; 394 395 sockaddr_at_init(&u.dsta, &sat->sat_addr, 0); 396 if (hintnet) 397 u.dsta.sat_addr.s_net = hintnet; 398 rt = rtcache_lookup(ro, &u.dst); 399 } 400 /* 401 * Make sure any route that we have has a valid interface. 402 */ 403 if (rt != NULL && (ifp = rt->rt_ifp) != NULL) { 404 TAILQ_FOREACH(aa, &at_ifaddr, aa_list) { 405 if (aa->aa_ifp == ifp) 406 break; 407 } 408 } else 409 aa = NULL; 410 if (aa == NULL) 411 return ENETUNREACH; 412 ddp->ddp_fsat = *sat; 413 if (ddp->ddp_lsat.sat_port == ATADDR_ANYPORT) 414 return at_pcbsetaddr(ddp, NULL, l); 415 return 0; 416 } 417 418 static void 419 at_pcbdisconnect(struct ddpcb *ddp) 420 { 421 ddp->ddp_fsat.sat_addr.s_net = ATADDR_ANYNET; 422 ddp->ddp_fsat.sat_addr.s_node = ATADDR_ANYNODE; 423 ddp->ddp_fsat.sat_port = ATADDR_ANYPORT; 424 } 425 426 static int 427 at_pcballoc(struct socket *so) 428 { 429 struct ddpcb *ddp; 430 431 ddp = malloc(sizeof(*ddp), M_PCB, M_WAITOK|M_ZERO); 432 if (!ddp) 433 panic("at_pcballoc"); 434 ddp->ddp_lsat.sat_port = ATADDR_ANYPORT; 435 436 ddp->ddp_next = ddpcb; 437 ddp->ddp_prev = NULL; 438 ddp->ddp_pprev = NULL; 439 ddp->ddp_pnext = NULL; 440 if (ddpcb) { 441 ddpcb->ddp_prev = ddp; 442 } 443 ddpcb = ddp; 444 445 ddp->ddp_socket = so; 446 so->so_pcb = (void *) ddp; 447 #ifdef MBUFTRACE 448 so->so_rcv.sb_mowner = &atalk_rx_mowner; 449 so->so_snd.sb_mowner = &atalk_tx_mowner; 450 #endif 451 return 0; 452 } 453 454 static void 455 at_pcbdetach(struct socket *so, struct ddpcb *ddp) 456 { 457 soisdisconnected(so); 458 so->so_pcb = 0; 459 /* sofree drops the lock */ 460 sofree(so); 461 mutex_enter(softnet_lock); 462 463 /* remove ddp from ddp_ports list */ 464 if (ddp->ddp_lsat.sat_port != ATADDR_ANYPORT && 465 ddp_ports[ddp->ddp_lsat.sat_port - 1] != NULL) { 466 if (ddp->ddp_pprev != NULL) { 467 ddp->ddp_pprev->ddp_pnext = ddp->ddp_pnext; 468 } else { 469 ddp_ports[ddp->ddp_lsat.sat_port - 1] = ddp->ddp_pnext; 470 } 471 if (ddp->ddp_pnext != NULL) { 472 ddp->ddp_pnext->ddp_pprev = ddp->ddp_pprev; 473 } 474 } 475 rtcache_free(&ddp->ddp_route); 476 if (ddp->ddp_prev) { 477 ddp->ddp_prev->ddp_next = ddp->ddp_next; 478 } else { 479 ddpcb = ddp->ddp_next; 480 } 481 if (ddp->ddp_next) { 482 ddp->ddp_next->ddp_prev = ddp->ddp_prev; 483 } 484 free(ddp, M_PCB); 485 } 486 487 /* 488 * For the moment, this just find the pcb with the correct local address. 489 * In the future, this will actually do some real searching, so we can use 490 * the sender's address to do de-multiplexing on a single port to many 491 * sockets (pcbs). 492 */ 493 struct ddpcb * 494 ddp_search( 495 struct sockaddr_at *from, 496 struct sockaddr_at *to, 497 struct at_ifaddr *aa) 498 { 499 struct ddpcb *ddp; 500 501 /* 502 * Check for bad ports. 503 */ 504 if (to->sat_port < ATPORT_FIRST || to->sat_port >= ATPORT_LAST) 505 return NULL; 506 507 /* 508 * Make sure the local address matches the sent address. What about 509 * the interface? 510 */ 511 for (ddp = ddp_ports[to->sat_port - 1]; ddp; ddp = ddp->ddp_pnext) { 512 /* XXX should we handle 0.YY? */ 513 514 /* XXXX.YY to socket on destination interface */ 515 if (to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net && 516 to->sat_addr.s_node == ddp->ddp_lsat.sat_addr.s_node) { 517 break; 518 } 519 /* 0.255 to socket on receiving interface */ 520 if (to->sat_addr.s_node == ATADDR_BCAST && 521 (to->sat_addr.s_net == 0 || 522 to->sat_addr.s_net == ddp->ddp_lsat.sat_addr.s_net) && 523 ddp->ddp_lsat.sat_addr.s_net == AA_SAT(aa)->sat_addr.s_net) { 524 break; 525 } 526 /* XXXX.0 to socket on destination interface */ 527 if (to->sat_addr.s_net == aa->aa_firstnet && 528 to->sat_addr.s_node == 0 && 529 ntohs(ddp->ddp_lsat.sat_addr.s_net) >= 530 ntohs(aa->aa_firstnet) && 531 ntohs(ddp->ddp_lsat.sat_addr.s_net) <= 532 ntohs(aa->aa_lastnet)) { 533 break; 534 } 535 } 536 return (ddp); 537 } 538 539 /* 540 * Initialize all the ddp & appletalk stuff 541 */ 542 void 543 ddp_init(void) 544 { 545 546 ddpstat_percpu = percpu_alloc(sizeof(uint64_t) * DDP_NSTATS); 547 548 TAILQ_INIT(&at_ifaddr); 549 atintrq1.ifq_maxlen = IFQ_MAXLEN; 550 atintrq2.ifq_maxlen = IFQ_MAXLEN; 551 552 MOWNER_ATTACH(&atalk_tx_mowner); 553 MOWNER_ATTACH(&atalk_rx_mowner); 554 } 555 556 #if 0 557 static void 558 ddp_clean(void) 559 { 560 struct ddpcb *ddp; 561 562 for (ddp = ddpcb; ddp; ddp = ddp->ddp_next) 563 at_pcbdetach(ddp->ddp_socket, ddp); 564 } 565 #endif 566 567 static int 568 sysctl_net_atalk_ddp_stats(SYSCTLFN_ARGS) 569 { 570 571 return (NETSTAT_SYSCTL(ddpstat_percpu, DDP_NSTATS)); 572 } 573 574 /* 575 * Sysctl for DDP variables. 576 */ 577 SYSCTL_SETUP(sysctl_net_atalk_ddp_setup, "sysctl net.atalk.ddp subtree setup") 578 { 579 580 sysctl_createv(clog, 0, NULL, NULL, 581 CTLFLAG_PERMANENT, 582 CTLTYPE_NODE, "net", NULL, 583 NULL, 0, NULL, 0, 584 CTL_NET, CTL_EOL); 585 sysctl_createv(clog, 0, NULL, NULL, 586 CTLFLAG_PERMANENT, 587 CTLTYPE_NODE, "atalk", NULL, 588 NULL, 0, NULL, 0, 589 CTL_NET, PF_APPLETALK, CTL_EOL); 590 sysctl_createv(clog, 0, NULL, NULL, 591 CTLFLAG_PERMANENT, 592 CTLTYPE_NODE, "ddp", 593 SYSCTL_DESCR("DDP related settings"), 594 NULL, 0, NULL, 0, 595 CTL_NET, PF_APPLETALK, ATPROTO_DDP, CTL_EOL); 596 597 sysctl_createv(clog, 0, NULL, NULL, 598 CTLFLAG_PERMANENT, 599 CTLTYPE_STRUCT, "stats", 600 SYSCTL_DESCR("DDP statistics"), 601 sysctl_net_atalk_ddp_stats, 0, NULL, 0, 602 CTL_NET, PF_APPLETALK, ATPROTO_DDP, CTL_CREATE, 603 CTL_EOL); 604 } 605