1 /* 2 * ng_cisco.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD$ 41 * $Whistle: ng_cisco.c,v 1.25 1999/11/01 09:24:51 julian Exp $ 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/errno.h> 47 #include <sys/kernel.h> 48 #include <sys/socket.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/syslog.h> 52 53 #include <net/if.h> 54 55 #include <netinet/in.h> 56 #include <netinet/if_ether.h> 57 58 #include <netatalk/at.h> 59 60 #include <netipx/ipx.h> 61 #include <netipx/ipx_if.h> 62 63 #include <netgraph/ng_message.h> 64 #include <netgraph/netgraph.h> 65 #include <netgraph/ng_parse.h> 66 #include <netgraph/ng_cisco.h> 67 68 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ 69 #define CISCO_UNICAST 0x0f /* Cisco unicast address */ 70 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ 71 #define CISCO_ADDR_REQ 0 /* Cisco address request */ 72 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ 73 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ 74 75 #define KEEPALIVE_SECS 10 76 77 struct cisco_header { 78 u_char address; 79 u_char control; 80 u_short protocol; 81 }; 82 83 #define CISCO_HEADER_LEN sizeof (struct cisco_header) 84 85 struct cisco_packet { 86 u_long type; 87 u_long par1; 88 u_long par2; 89 u_short rel; 90 u_short time0; 91 u_short time1; 92 }; 93 94 #define CISCO_PACKET_LEN (sizeof(struct cisco_packet)) 95 96 struct protoent { 97 hook_p hook; /* the hook for this proto */ 98 u_short af; /* address family, -1 = downstream */ 99 }; 100 101 struct cisco_priv { 102 u_long local_seq; 103 u_long remote_seq; 104 u_long seqRetries; /* how many times we've been here throwing out 105 * the same sequence number without ack */ 106 node_p node; 107 struct callout handle; 108 struct protoent downstream; 109 struct protoent inet; /* IP information */ 110 struct in_addr localip; 111 struct in_addr localmask; 112 struct protoent inet6; /* IPv6 information */ 113 struct protoent atalk; /* AppleTalk information */ 114 struct protoent ipx; /* IPX information */ 115 }; 116 typedef struct cisco_priv *sc_p; 117 118 /* Netgraph methods */ 119 static ng_constructor_t cisco_constructor; 120 static ng_rcvmsg_t cisco_rcvmsg; 121 static ng_shutdown_t cisco_shutdown; 122 static ng_newhook_t cisco_newhook; 123 static ng_rcvdata_t cisco_rcvdata; 124 static ng_disconnect_t cisco_disconnect; 125 126 /* Other functions */ 127 static int cisco_input(sc_p sc, item_p item); 128 static void cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2); 129 static int cisco_send(sc_p sc, int type, long par1, long par2); 130 static void cisco_notify(sc_p sc, uint32_t cmd); 131 132 /* Parse type for struct ng_cisco_ipaddr */ 133 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 134 = NG_CISCO_IPADDR_TYPE_INFO; 135 static const struct ng_parse_type ng_cisco_ipaddr_type = { 136 &ng_parse_struct_type, 137 &ng_cisco_ipaddr_type_fields 138 }; 139 140 /* Parse type for struct ng_async_stat */ 141 static const struct ng_parse_struct_field ng_cisco_stats_type_fields[] 142 = NG_CISCO_STATS_TYPE_INFO; 143 static const struct ng_parse_type ng_cisco_stats_type = { 144 &ng_parse_struct_type, 145 &ng_cisco_stats_type_fields 146 }; 147 148 /* List of commands and how to convert arguments to/from ASCII */ 149 static const struct ng_cmdlist ng_cisco_cmdlist[] = { 150 { 151 NGM_CISCO_COOKIE, 152 NGM_CISCO_SET_IPADDR, 153 "setipaddr", 154 &ng_cisco_ipaddr_type, 155 NULL 156 }, 157 { 158 NGM_CISCO_COOKIE, 159 NGM_CISCO_GET_IPADDR, 160 "getipaddr", 161 NULL, 162 &ng_cisco_ipaddr_type 163 }, 164 { 165 NGM_CISCO_COOKIE, 166 NGM_CISCO_GET_STATUS, 167 "getstats", 168 NULL, 169 &ng_cisco_stats_type 170 }, 171 { 0 } 172 }; 173 174 /* Node type */ 175 static struct ng_type typestruct = { 176 .version = NG_ABI_VERSION, 177 .name = NG_CISCO_NODE_TYPE, 178 .constructor = cisco_constructor, 179 .rcvmsg = cisco_rcvmsg, 180 .shutdown = cisco_shutdown, 181 .newhook = cisco_newhook, 182 .rcvdata = cisco_rcvdata, 183 .disconnect = cisco_disconnect, 184 .cmdlist = ng_cisco_cmdlist, 185 }; 186 NETGRAPH_INIT(cisco, &typestruct); 187 188 /* 189 * Node constructor 190 */ 191 static int 192 cisco_constructor(node_p node) 193 { 194 sc_p sc; 195 196 sc = malloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO); 197 198 ng_callout_init(&sc->handle); 199 NG_NODE_SET_PRIVATE(node, sc); 200 sc->node = node; 201 202 /* Initialise the varous protocol hook holders */ 203 sc->downstream.af = 0xffff; 204 sc->inet.af = AF_INET; 205 sc->inet6.af = AF_INET6; 206 sc->atalk.af = AF_APPLETALK; 207 sc->ipx.af = AF_IPX; 208 return (0); 209 } 210 211 /* 212 * Check new hook 213 */ 214 static int 215 cisco_newhook(node_p node, hook_p hook, const char *name) 216 { 217 const sc_p sc = NG_NODE_PRIVATE(node); 218 219 if (strcmp(name, NG_CISCO_HOOK_DOWNSTREAM) == 0) { 220 sc->downstream.hook = hook; 221 NG_HOOK_SET_PRIVATE(hook, &sc->downstream); 222 223 /* Start keepalives */ 224 ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS), 225 &cisco_keepalive, (void *)sc, 0); 226 } else if (strcmp(name, NG_CISCO_HOOK_INET) == 0) { 227 sc->inet.hook = hook; 228 NG_HOOK_SET_PRIVATE(hook, &sc->inet); 229 } else if (strcmp(name, NG_CISCO_HOOK_INET6) == 0) { 230 sc->inet6.hook = hook; 231 NG_HOOK_SET_PRIVATE(hook, &sc->inet6); 232 } else if (strcmp(name, NG_CISCO_HOOK_APPLETALK) == 0) { 233 sc->atalk.hook = hook; 234 NG_HOOK_SET_PRIVATE(hook, &sc->atalk); 235 } else if (strcmp(name, NG_CISCO_HOOK_IPX) == 0) { 236 sc->ipx.hook = hook; 237 NG_HOOK_SET_PRIVATE(hook, &sc->ipx); 238 } else if (strcmp(name, NG_CISCO_HOOK_DEBUG) == 0) { 239 NG_HOOK_SET_PRIVATE(hook, NULL); /* unimplemented */ 240 } else 241 return (EINVAL); 242 return 0; 243 } 244 245 /* 246 * Receive control message. 247 */ 248 static int 249 cisco_rcvmsg(node_p node, item_p item, hook_p lasthook) 250 { 251 struct ng_mesg *msg; 252 const sc_p sc = NG_NODE_PRIVATE(node); 253 struct ng_mesg *resp = NULL; 254 int error = 0; 255 256 NGI_GET_MSG(item, msg); 257 switch (msg->header.typecookie) { 258 case NGM_GENERIC_COOKIE: 259 switch (msg->header.cmd) { 260 case NGM_TEXT_STATUS: 261 { 262 char *arg; 263 int pos; 264 265 NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT); 266 if (resp == NULL) { 267 error = ENOMEM; 268 break; 269 } 270 arg = (char *) resp->data; 271 pos = sprintf(arg, 272 "keepalive period: %d sec; ", KEEPALIVE_SECS); 273 pos += sprintf(arg + pos, 274 "unacknowledged keepalives: %ld", sc->seqRetries); 275 resp->header.arglen = pos + 1; 276 break; 277 } 278 default: 279 error = EINVAL; 280 break; 281 } 282 break; 283 case NGM_CISCO_COOKIE: 284 switch (msg->header.cmd) { 285 case NGM_CISCO_GET_IPADDR: /* could be a late reply! */ 286 if ((msg->header.flags & NGF_RESP) == 0) { 287 struct in_addr *ips; 288 289 NG_MKRESPONSE(resp, msg, 290 2 * sizeof(*ips), M_NOWAIT); 291 if (!resp) { 292 error = ENOMEM; 293 break; 294 } 295 ips = (struct in_addr *) resp->data; 296 ips[0] = sc->localip; 297 ips[1] = sc->localmask; 298 break; 299 } 300 /* FALLTHROUGH */ /* ...if it's a reply */ 301 case NGM_CISCO_SET_IPADDR: 302 { 303 struct in_addr *const ips = (struct in_addr *)msg->data; 304 305 if (msg->header.arglen < 2 * sizeof(*ips)) { 306 error = EINVAL; 307 break; 308 } 309 sc->localip = ips[0]; 310 sc->localmask = ips[1]; 311 break; 312 } 313 case NGM_CISCO_GET_STATUS: 314 { 315 struct ng_cisco_stats *stat; 316 317 NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT); 318 if (!resp) { 319 error = ENOMEM; 320 break; 321 } 322 stat = (struct ng_cisco_stats *)resp->data; 323 stat->seqRetries = sc->seqRetries; 324 stat->keepAlivePeriod = KEEPALIVE_SECS; 325 break; 326 } 327 default: 328 error = EINVAL; 329 break; 330 } 331 break; 332 default: 333 error = EINVAL; 334 break; 335 } 336 NG_RESPOND_MSG(error, node, item, resp); 337 NG_FREE_MSG(msg); 338 return (error); 339 } 340 341 /* 342 * Receive data 343 */ 344 static int 345 cisco_rcvdata(hook_p hook, item_p item) 346 { 347 const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 348 struct protoent *pep; 349 struct cisco_header *h; 350 struct mbuf *m; 351 int error = 0; 352 353 if ((pep = NG_HOOK_PRIVATE(hook)) == NULL) 354 goto out; 355 356 /* If it came from our downlink, deal with it separately */ 357 if (pep->af == 0xffff) 358 return (cisco_input(sc, item)); 359 360 /* OK so it came from a protocol, heading out. Prepend general data 361 packet header. For now, IP,IPX only */ 362 m = NGI_M(item); /* still associated with item */ 363 M_PREPEND(m, CISCO_HEADER_LEN, M_DONTWAIT); 364 if (!m) { 365 error = ENOBUFS; 366 goto out; 367 } 368 h = mtod(m, struct cisco_header *); 369 h->address = CISCO_UNICAST; 370 h->control = 0; 371 372 switch (pep->af) { 373 case AF_INET: /* Internet Protocol */ 374 h->protocol = htons(ETHERTYPE_IP); 375 break; 376 case AF_INET6: 377 h->protocol = htons(ETHERTYPE_IPV6); 378 break; 379 case AF_APPLETALK: /* AppleTalk Protocol */ 380 h->protocol = htons(ETHERTYPE_AT); 381 break; 382 case AF_IPX: /* Novell IPX Protocol */ 383 h->protocol = htons(ETHERTYPE_IPX); 384 break; 385 default: 386 error = EAFNOSUPPORT; 387 goto out; 388 } 389 390 /* Send it */ 391 NG_FWD_NEW_DATA(error, item, sc->downstream.hook, m); 392 return (error); 393 394 out: 395 NG_FREE_ITEM(item); 396 return (error); 397 } 398 399 /* 400 * Shutdown node 401 */ 402 static int 403 cisco_shutdown(node_p node) 404 { 405 const sc_p sc = NG_NODE_PRIVATE(node); 406 407 NG_NODE_SET_PRIVATE(node, NULL); 408 NG_NODE_UNREF(sc->node); 409 free(sc, M_NETGRAPH); 410 return (0); 411 } 412 413 /* 414 * Disconnection of a hook 415 * 416 * For this type, removal of the last link destroys the node 417 */ 418 static int 419 cisco_disconnect(hook_p hook) 420 { 421 const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 422 struct protoent *pep; 423 424 /* Check it's not the debug hook */ 425 if ((pep = NG_HOOK_PRIVATE(hook))) { 426 pep->hook = NULL; 427 if (pep->af == 0xffff) 428 /* If it is the downstream hook, stop the timers */ 429 ng_uncallout(&sc->handle, NG_HOOK_NODE(hook)); 430 } 431 432 /* If no more hooks, remove the node */ 433 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 434 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 435 ng_rmnode_self(NG_HOOK_NODE(hook)); 436 return (0); 437 } 438 439 /* 440 * Receive data 441 */ 442 static int 443 cisco_input(sc_p sc, item_p item) 444 { 445 const struct cisco_header *h; 446 struct cisco_header hdrbuf; 447 struct protoent *pep; 448 struct mbuf *m; 449 int error = 0; 450 451 /* Get data */ 452 m = NGI_M(item); 453 454 /* Sanity check header length */ 455 if (m->m_pkthdr.len < sizeof(*h)) { 456 error = EINVAL; 457 goto drop; 458 } 459 460 /* Get cisco header */ 461 if (m->m_len >= sizeof(*h)) /* the common case */ 462 h = mtod(m, const struct cisco_header *); 463 else { 464 m_copydata(m, 0, sizeof(*h), (caddr_t)&hdrbuf); 465 h = &hdrbuf; 466 } 467 m_adj(m, sizeof(*h)); 468 469 /* Check header address */ 470 switch (h->address) { 471 default: /* Invalid Cisco packet. */ 472 goto drop; 473 case CISCO_UNICAST: 474 case CISCO_MULTICAST: 475 /* Don't check the control field here (RFC 1547). */ 476 switch (ntohs(h->protocol)) { 477 default: 478 goto drop; 479 case CISCO_KEEPALIVE: 480 { 481 const struct cisco_packet *p; 482 struct cisco_packet pktbuf; 483 484 /* Sanity check packet length */ 485 if (m->m_pkthdr.len < sizeof(*p)) { 486 error = EINVAL; 487 goto drop; 488 } 489 490 /* Get cisco packet */ 491 if (m->m_len >= sizeof(*p)) /* the common case */ 492 p = mtod(m, const struct cisco_packet *); 493 else { 494 m_copydata(m, 0, sizeof(*p), (caddr_t)&pktbuf); 495 p = &pktbuf; 496 } 497 498 /* Check packet type */ 499 switch (ntohl(p->type)) { 500 default: 501 log(LOG_WARNING, 502 "cisco: unknown cisco packet type: 0x%lx\n", 503 (long)ntohl(p->type)); 504 break; 505 case CISCO_ADDR_REPLY: 506 /* Reply on address request, ignore */ 507 break; 508 case CISCO_KEEPALIVE_REQ: 509 sc->remote_seq = ntohl(p->par1); 510 if (sc->local_seq == ntohl(p->par2)) { 511 sc->local_seq++; 512 if (sc->seqRetries > 1) 513 cisco_notify(sc, NGM_LINK_IS_UP); 514 sc->seqRetries = 0; 515 } 516 break; 517 case CISCO_ADDR_REQ: 518 { 519 struct ng_mesg *msg; 520 int dummy_error = 0; 521 522 /* Ask inet peer for IP address information */ 523 if (sc->inet.hook == NULL) 524 goto nomsg; 525 NG_MKMESSAGE(msg, NGM_CISCO_COOKIE, 526 NGM_CISCO_GET_IPADDR, 0, M_NOWAIT); 527 if (msg == NULL) 528 goto nomsg; 529 NG_SEND_MSG_HOOK(dummy_error, 530 sc->node, msg, sc->inet.hook, 0); 531 /* 532 * XXX Now maybe we should set a flag telling 533 * our receiver to send this message when the response comes in 534 * instead of now when the data may be bad. 535 */ 536 nomsg: 537 /* Send reply to peer device */ 538 error = cisco_send(sc, CISCO_ADDR_REPLY, 539 ntohl(sc->localip.s_addr), 540 ntohl(sc->localmask.s_addr)); 541 break; 542 } 543 } 544 goto drop; 545 } 546 case ETHERTYPE_IP: 547 pep = &sc->inet; 548 break; 549 case ETHERTYPE_IPV6: 550 pep = &sc->inet6; 551 break; 552 case ETHERTYPE_AT: 553 pep = &sc->atalk; 554 break; 555 case ETHERTYPE_IPX: 556 pep = &sc->ipx; 557 break; 558 } 559 break; 560 } 561 562 /* Drop if payload is empty */ 563 if (m->m_pkthdr.len == 0) { 564 error = EINVAL; 565 goto drop; 566 } 567 568 /* Send it on */ 569 if (pep->hook == NULL) 570 goto drop; 571 NG_FWD_NEW_DATA(error, item, pep->hook, m); 572 return (error); 573 574 drop: 575 NG_FREE_ITEM(item); 576 return (error); 577 } 578 579 580 /* 581 * Send keepalive packets, every 10 seconds. 582 */ 583 static void 584 cisco_keepalive(node_p node, hook_p hook, void *arg1, int arg2) 585 { 586 const sc_p sc = arg1; 587 588 cisco_send(sc, CISCO_KEEPALIVE_REQ, sc->local_seq, sc->remote_seq); 589 if (sc->seqRetries++ > 1) 590 cisco_notify(sc, NGM_LINK_IS_DOWN); 591 ng_callout(&sc->handle, node, NULL, (hz * KEEPALIVE_SECS), 592 &cisco_keepalive, (void *)sc, 0); 593 } 594 595 /* 596 * Send Cisco keepalive packet. 597 */ 598 static int 599 cisco_send(sc_p sc, int type, long par1, long par2) 600 { 601 struct cisco_header *h; 602 struct cisco_packet *ch; 603 struct mbuf *m; 604 struct timeval time; 605 u_long t; 606 int error = 0; 607 608 getmicrouptime(&time); 609 610 MGETHDR(m, M_DONTWAIT, MT_DATA); 611 if (!m) 612 return (ENOBUFS); 613 614 t = time.tv_sec * 1000 + time.tv_usec / 1000; 615 m->m_pkthdr.len = m->m_len = CISCO_HEADER_LEN + CISCO_PACKET_LEN; 616 m->m_pkthdr.rcvif = 0; 617 618 h = mtod(m, struct cisco_header *); 619 h->address = CISCO_MULTICAST; 620 h->control = 0; 621 h->protocol = htons(CISCO_KEEPALIVE); 622 623 ch = (struct cisco_packet *) (h + 1); 624 ch->type = htonl(type); 625 ch->par1 = htonl(par1); 626 ch->par2 = htonl(par2); 627 ch->rel = -1; 628 ch->time0 = htons((u_short) (t >> 16)); 629 ch->time1 = htons((u_short) t); 630 631 NG_SEND_DATA_ONLY(error, sc->downstream.hook, m); 632 return (error); 633 } 634 635 /* 636 * Send linkstate to upstream node. 637 */ 638 static void 639 cisco_notify(sc_p sc, uint32_t cmd) 640 { 641 struct ng_mesg *msg; 642 int dummy_error = 0; 643 644 if (sc->inet.hook == NULL) /* nothing to notify */ 645 return; 646 647 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT); 648 if (msg != NULL) 649 NG_SEND_MSG_HOOK(dummy_error, sc->node, msg, sc->inet.hook, 0); 650 } 651