1 2 /* 3 * ng_iface.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Archie Cobbs <archie@freebsd.org> 38 * 39 * $FreeBSD: src/sys/netgraph/ng_iface.c,v 1.7.2.5 2002/07/02 23:44:02 archie Exp $ 40 * $DragonFly: src/sys/netgraph/iface/ng_iface.c,v 1.2 2003/06/17 04:28:50 dillon Exp $ 41 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $ 42 */ 43 44 /* 45 * This node is also a system networking interface. It has 46 * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets 47 * are simply relayed between the interface and the hooks. 48 * 49 * Interfaces are named ng0, ng1, etc. New nodes take the 50 * first available interface name. 51 * 52 * This node also includes Berkeley packet filter support. 53 */ 54 55 #include <sys/param.h> 56 #include <sys/systm.h> 57 #include <sys/errno.h> 58 #include <sys/kernel.h> 59 #include <sys/malloc.h> 60 #include <sys/mbuf.h> 61 #include <sys/errno.h> 62 #include <sys/sockio.h> 63 #include <sys/socket.h> 64 #include <sys/syslog.h> 65 #include <sys/libkern.h> 66 67 #include <net/if.h> 68 #include <net/if_types.h> 69 #include <net/intrq.h> 70 #include <net/bpf.h> 71 72 #include <netinet/in.h> 73 74 #include <netgraph/ng_message.h> 75 #include <netgraph/netgraph.h> 76 #include <netgraph/ng_parse.h> 77 #include <netgraph/ng_iface.h> 78 #include <netgraph/ng_cisco.h> 79 80 /* This struct describes one address family */ 81 struct iffam { 82 sa_family_t family; /* Address family */ 83 const char *hookname; /* Name for hook */ 84 }; 85 typedef const struct iffam *iffam_p; 86 87 /* List of address families supported by our interface */ 88 const static struct iffam gFamilies[] = { 89 { AF_INET, NG_IFACE_HOOK_INET }, 90 { AF_INET6, NG_IFACE_HOOK_INET6 }, 91 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 92 { AF_IPX, NG_IFACE_HOOK_IPX }, 93 { AF_ATM, NG_IFACE_HOOK_ATM }, 94 { AF_NATM, NG_IFACE_HOOK_NATM }, 95 { AF_NS, NG_IFACE_HOOK_NS }, 96 }; 97 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 98 99 /* Node private data */ 100 struct ng_iface_private { 101 struct ifnet *ifp; /* Our interface */ 102 int unit; /* Interface unit number */ 103 node_p node; /* Our netgraph node */ 104 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 105 }; 106 typedef struct ng_iface_private *priv_p; 107 108 /* Interface methods */ 109 static void ng_iface_start(struct ifnet *ifp); 110 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 111 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 112 struct sockaddr *dst, struct rtentry *rt0); 113 static void ng_iface_bpftap(struct ifnet *ifp, 114 struct mbuf *m, sa_family_t family); 115 #ifdef DEBUG 116 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 117 #endif 118 119 /* Netgraph methods */ 120 static ng_constructor_t ng_iface_constructor; 121 static ng_rcvmsg_t ng_iface_rcvmsg; 122 static ng_shutdown_t ng_iface_rmnode; 123 static ng_newhook_t ng_iface_newhook; 124 static ng_rcvdata_t ng_iface_rcvdata; 125 static ng_disconnect_t ng_iface_disconnect; 126 127 /* Helper stuff */ 128 static iffam_p get_iffam_from_af(sa_family_t family); 129 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 130 static iffam_p get_iffam_from_name(const char *name); 131 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 132 133 /* Parse type for struct ng_iface_ifname */ 134 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { 135 NG_IFACE_IFACE_NAME_MAX + 1 136 }; 137 static const struct ng_parse_type ng_iface_ifname_type = { 138 &ng_parse_fixedstring_type, 139 &ng_iface_ifname_info 140 }; 141 142 /* Parse type for struct ng_cisco_ipaddr */ 143 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 144 = NG_CISCO_IPADDR_TYPE_INFO; 145 static const struct ng_parse_type ng_cisco_ipaddr_type = { 146 &ng_parse_struct_type, 147 &ng_cisco_ipaddr_type_fields 148 }; 149 150 /* List of commands and how to convert arguments to/from ASCII */ 151 static const struct ng_cmdlist ng_iface_cmds[] = { 152 { 153 NGM_IFACE_COOKIE, 154 NGM_IFACE_GET_IFNAME, 155 "getifname", 156 NULL, 157 &ng_iface_ifname_type 158 }, 159 { 160 NGM_IFACE_COOKIE, 161 NGM_IFACE_POINT2POINT, 162 "point2point", 163 NULL, 164 NULL 165 }, 166 { 167 NGM_IFACE_COOKIE, 168 NGM_IFACE_BROADCAST, 169 "broadcast", 170 NULL, 171 NULL 172 }, 173 { 174 NGM_CISCO_COOKIE, 175 NGM_CISCO_GET_IPADDR, 176 "getipaddr", 177 NULL, 178 &ng_cisco_ipaddr_type 179 }, 180 { 0 } 181 }; 182 183 /* Node type descriptor */ 184 static struct ng_type typestruct = { 185 NG_VERSION, 186 NG_IFACE_NODE_TYPE, 187 NULL, 188 ng_iface_constructor, 189 ng_iface_rcvmsg, 190 ng_iface_rmnode, 191 ng_iface_newhook, 192 NULL, 193 NULL, 194 ng_iface_rcvdata, 195 ng_iface_rcvdata, 196 ng_iface_disconnect, 197 ng_iface_cmds 198 }; 199 NETGRAPH_INIT(iface, &typestruct); 200 201 /* We keep a bitmap indicating which unit numbers are free. 202 One means the unit number is free, zero means it's taken. */ 203 static int *ng_iface_units = NULL; 204 static int ng_iface_units_len = 0; 205 206 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 207 208 /************************************************************************ 209 HELPER STUFF 210 ************************************************************************/ 211 212 /* 213 * Get the family descriptor from the family ID 214 */ 215 static __inline__ iffam_p 216 get_iffam_from_af(sa_family_t family) 217 { 218 iffam_p iffam; 219 int k; 220 221 for (k = 0; k < NUM_FAMILIES; k++) { 222 iffam = &gFamilies[k]; 223 if (iffam->family == family) 224 return (iffam); 225 } 226 return (NULL); 227 } 228 229 /* 230 * Get the family descriptor from the hook 231 */ 232 static __inline__ iffam_p 233 get_iffam_from_hook(priv_p priv, hook_p hook) 234 { 235 int k; 236 237 for (k = 0; k < NUM_FAMILIES; k++) 238 if (priv->hooks[k] == hook) 239 return (&gFamilies[k]); 240 return (NULL); 241 } 242 243 /* 244 * Get the hook from the iffam descriptor 245 */ 246 247 static __inline__ hook_p * 248 get_hook_from_iffam(priv_p priv, iffam_p iffam) 249 { 250 return (&priv->hooks[iffam - gFamilies]); 251 } 252 253 /* 254 * Get the iffam descriptor from the name 255 */ 256 static __inline__ iffam_p 257 get_iffam_from_name(const char *name) 258 { 259 iffam_p iffam; 260 int k; 261 262 for (k = 0; k < NUM_FAMILIES; k++) { 263 iffam = &gFamilies[k]; 264 if (!strcmp(iffam->hookname, name)) 265 return (iffam); 266 } 267 return (NULL); 268 } 269 270 /* 271 * Find the first free unit number for a new interface. 272 * Increase the size of the unit bitmap as necessary. 273 */ 274 static __inline__ int 275 ng_iface_get_unit(int *unit) 276 { 277 int index, bit; 278 279 for (index = 0; index < ng_iface_units_len 280 && ng_iface_units[index] == 0; index++); 281 if (index == ng_iface_units_len) { /* extend array */ 282 int i, *newarray, newlen; 283 284 newlen = (2 * ng_iface_units_len) + 4; 285 MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units), 286 M_NETGRAPH, M_NOWAIT); 287 if (newarray == NULL) 288 return (ENOMEM); 289 bcopy(ng_iface_units, newarray, 290 ng_iface_units_len * sizeof(*ng_iface_units)); 291 for (i = ng_iface_units_len; i < newlen; i++) 292 newarray[i] = ~0; 293 if (ng_iface_units != NULL) 294 FREE(ng_iface_units, M_NETGRAPH); 295 ng_iface_units = newarray; 296 ng_iface_units_len = newlen; 297 } 298 bit = ffs(ng_iface_units[index]) - 1; 299 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 300 ("%s: word=%d bit=%d", __FUNCTION__, ng_iface_units[index], bit)); 301 ng_iface_units[index] &= ~(1 << bit); 302 *unit = (index * UNITS_BITSPERWORD) + bit; 303 return (0); 304 } 305 306 /* 307 * Free a no longer needed unit number. 308 */ 309 static __inline__ void 310 ng_iface_free_unit(int unit) 311 { 312 int index, bit; 313 314 index = unit / UNITS_BITSPERWORD; 315 bit = unit % UNITS_BITSPERWORD; 316 KASSERT(index < ng_iface_units_len, 317 ("%s: unit=%d len=%d", __FUNCTION__, unit, ng_iface_units_len)); 318 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 319 ("%s: unit=%d is free", __FUNCTION__, unit)); 320 ng_iface_units[index] |= (1 << bit); 321 /* 322 * XXX We could think about reducing the size of ng_iface_units[] 323 * XXX here if the last portion is all ones 324 */ 325 } 326 327 /************************************************************************ 328 INTERFACE STUFF 329 ************************************************************************/ 330 331 /* 332 * Process an ioctl for the virtual interface 333 */ 334 static int 335 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 336 { 337 struct ifreq *const ifr = (struct ifreq *) data; 338 int s, error = 0; 339 340 #ifdef DEBUG 341 ng_iface_print_ioctl(ifp, command, data); 342 #endif 343 s = splimp(); 344 switch (command) { 345 346 /* These two are mostly handled at a higher layer */ 347 case SIOCSIFADDR: 348 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 349 ifp->if_flags &= ~(IFF_OACTIVE); 350 break; 351 case SIOCGIFADDR: 352 break; 353 354 /* Set flags */ 355 case SIOCSIFFLAGS: 356 /* 357 * If the interface is marked up and stopped, then start it. 358 * If it is marked down and running, then stop it. 359 */ 360 if (ifr->ifr_flags & IFF_UP) { 361 if (!(ifp->if_flags & IFF_RUNNING)) { 362 ifp->if_flags &= ~(IFF_OACTIVE); 363 ifp->if_flags |= IFF_RUNNING; 364 } 365 } else { 366 if (ifp->if_flags & IFF_RUNNING) 367 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 368 } 369 break; 370 371 /* Set the interface MTU */ 372 case SIOCSIFMTU: 373 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 374 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 375 error = EINVAL; 376 else 377 ifp->if_mtu = ifr->ifr_mtu; 378 break; 379 380 /* Stuff that's not supported */ 381 case SIOCADDMULTI: 382 case SIOCDELMULTI: 383 error = 0; 384 break; 385 case SIOCSIFPHYS: 386 error = EOPNOTSUPP; 387 break; 388 389 default: 390 error = EINVAL; 391 break; 392 } 393 (void) splx(s); 394 return (error); 395 } 396 397 /* 398 * This routine is called to deliver a packet out the interface. 399 * We simply look at the address family and relay the packet to 400 * the corresponding hook, if it exists and is connected. 401 */ 402 403 static int 404 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 405 struct sockaddr *dst, struct rtentry *rt0) 406 { 407 const priv_p priv = (priv_p) ifp->if_softc; 408 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 409 meta_p meta = NULL; 410 int len, error = 0; 411 412 /* Check interface flags */ 413 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 414 m_freem(m); 415 return (ENETDOWN); 416 } 417 418 /* BPF writes need to be handled specially */ 419 if (dst->sa_family == AF_UNSPEC) { 420 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 421 return (ENOBUFS); 422 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 423 m->m_data += 4; 424 m->m_len -= 4; 425 m->m_pkthdr.len -= 4; 426 } 427 428 /* Berkeley packet filter */ 429 ng_iface_bpftap(ifp, m, dst->sa_family); 430 431 /* Check address family to determine hook (if known) */ 432 if (iffam == NULL) { 433 m_freem(m); 434 log(LOG_WARNING, "%s%d: can't handle af%d\n", 435 ifp->if_name, ifp->if_unit, (int)dst->sa_family); 436 return (EAFNOSUPPORT); 437 } 438 439 /* Copy length before the mbuf gets invalidated */ 440 len = m->m_pkthdr.len; 441 442 /* Send packet; if hook is not connected, mbuf will get freed. */ 443 NG_SEND_DATA(error, *get_hook_from_iffam(priv, iffam), m, meta); 444 445 /* Update stats */ 446 if (error == 0) { 447 ifp->if_obytes += len; 448 ifp->if_opackets++; 449 } 450 return (error); 451 } 452 453 /* 454 * This routine should never be called 455 */ 456 457 static void 458 ng_iface_start(struct ifnet *ifp) 459 { 460 printf("%s%d: %s called?", ifp->if_name, ifp->if_unit, __FUNCTION__); 461 } 462 463 /* 464 * Flash a packet by the BPF (requires prepending 4 byte AF header) 465 * Note the phoney mbuf; this is OK because BPF treats it read-only. 466 */ 467 static void 468 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 469 { 470 int32_t family4 = (int32_t)family; 471 struct mbuf m0; 472 473 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __FUNCTION__)); 474 if (ifp->if_bpf != NULL) { 475 bzero(&m0, sizeof(m0)); 476 m0.m_next = m; 477 m0.m_len = sizeof(family4); 478 m0.m_data = (char *)&family4; 479 bpf_mtap(ifp, &m0); 480 } 481 } 482 483 #ifdef DEBUG 484 /* 485 * Display an ioctl to the virtual interface 486 */ 487 488 static void 489 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 490 { 491 char *str; 492 493 switch (command & IOC_DIRMASK) { 494 case IOC_VOID: 495 str = "IO"; 496 break; 497 case IOC_OUT: 498 str = "IOR"; 499 break; 500 case IOC_IN: 501 str = "IOW"; 502 break; 503 case IOC_INOUT: 504 str = "IORW"; 505 break; 506 default: 507 str = "IO??"; 508 } 509 log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n", 510 ifp->if_name, ifp->if_unit, 511 str, 512 IOCGROUP(command), 513 command & 0xff, 514 IOCPARM_LEN(command)); 515 } 516 #endif /* DEBUG */ 517 518 /************************************************************************ 519 NETGRAPH NODE STUFF 520 ************************************************************************/ 521 522 /* 523 * Constructor for a node 524 */ 525 static int 526 ng_iface_constructor(node_p *nodep) 527 { 528 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 529 struct ifnet *ifp; 530 node_p node; 531 priv_p priv; 532 int error = 0; 533 534 /* Allocate node and interface private structures */ 535 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT); 536 if (priv == NULL) 537 return (ENOMEM); 538 bzero(priv, sizeof(*priv)); 539 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH, M_NOWAIT); 540 if (ifp == NULL) { 541 FREE(priv, M_NETGRAPH); 542 return (ENOMEM); 543 } 544 bzero(ifp, sizeof(*ifp)); 545 546 /* Link them together */ 547 ifp->if_softc = priv; 548 priv->ifp = ifp; 549 550 /* Get an interface unit number */ 551 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 552 FREE(ifp, M_NETGRAPH); 553 FREE(priv, M_NETGRAPH); 554 return (error); 555 } 556 557 /* Call generic node constructor */ 558 if ((error = ng_make_node_common(&typestruct, nodep)) != 0) { 559 ng_iface_free_unit(priv->unit); 560 FREE(ifp, M_NETGRAPH); 561 FREE(priv, M_NETGRAPH); 562 return (error); 563 } 564 node = *nodep; 565 566 /* Link together node and private info */ 567 node->private = priv; 568 priv->node = node; 569 570 /* Initialize interface structure */ 571 ifp->if_name = NG_IFACE_IFACE_NAME; 572 ifp->if_unit = priv->unit; 573 ifp->if_output = ng_iface_output; 574 ifp->if_start = ng_iface_start; 575 ifp->if_ioctl = ng_iface_ioctl; 576 ifp->if_watchdog = NULL; 577 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 578 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 579 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 580 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 581 ifp->if_addrlen = 0; /* XXX */ 582 ifp->if_hdrlen = 0; /* XXX */ 583 ifp->if_baudrate = 64000; /* XXX */ 584 TAILQ_INIT(&ifp->if_addrhead); 585 586 /* Give this node the same name as the interface (if possible) */ 587 bzero(ifname, sizeof(ifname)); 588 snprintf(ifname, sizeof(ifname), "%s%d", ifp->if_name, ifp->if_unit); 589 if (ng_name_node(node, ifname) != 0) 590 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 591 592 /* Attach the interface */ 593 if_attach(ifp); 594 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 595 596 /* Done */ 597 return (0); 598 } 599 600 /* 601 * Give our ok for a hook to be added 602 */ 603 static int 604 ng_iface_newhook(node_p node, hook_p hook, const char *name) 605 { 606 const iffam_p iffam = get_iffam_from_name(name); 607 hook_p *hookptr; 608 609 if (iffam == NULL) 610 return (EPFNOSUPPORT); 611 hookptr = get_hook_from_iffam((priv_p) node->private, iffam); 612 if (*hookptr != NULL) 613 return (EISCONN); 614 *hookptr = hook; 615 return (0); 616 } 617 618 /* 619 * Receive a control message 620 */ 621 static int 622 ng_iface_rcvmsg(node_p node, struct ng_mesg *msg, 623 const char *retaddr, struct ng_mesg **rptr) 624 { 625 const priv_p priv = node->private; 626 struct ifnet *const ifp = priv->ifp; 627 struct ng_mesg *resp = NULL; 628 int error = 0; 629 630 switch (msg->header.typecookie) { 631 case NGM_IFACE_COOKIE: 632 switch (msg->header.cmd) { 633 case NGM_IFACE_GET_IFNAME: 634 { 635 struct ng_iface_ifname *arg; 636 637 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 638 if (resp == NULL) { 639 error = ENOMEM; 640 break; 641 } 642 arg = (struct ng_iface_ifname *)resp->data; 643 snprintf(arg->ngif_name, sizeof(arg->ngif_name), 644 "%s%d", ifp->if_name, ifp->if_unit); 645 break; 646 } 647 648 case NGM_IFACE_POINT2POINT: 649 case NGM_IFACE_BROADCAST: 650 { 651 652 /* Deny request if interface is UP */ 653 if ((ifp->if_flags & IFF_UP) != 0) 654 return (EBUSY); 655 656 /* Change flags */ 657 switch (msg->header.cmd) { 658 case NGM_IFACE_POINT2POINT: 659 ifp->if_flags |= IFF_POINTOPOINT; 660 ifp->if_flags &= ~IFF_BROADCAST; 661 break; 662 case NGM_IFACE_BROADCAST: 663 ifp->if_flags &= ~IFF_POINTOPOINT; 664 ifp->if_flags |= IFF_BROADCAST; 665 break; 666 } 667 break; 668 } 669 670 default: 671 error = EINVAL; 672 break; 673 } 674 break; 675 case NGM_CISCO_COOKIE: 676 switch (msg->header.cmd) { 677 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 678 { 679 struct ifaddr *ifa; 680 681 /* Return the first configured IP address */ 682 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 683 struct ng_cisco_ipaddr *ips; 684 685 if (ifa->ifa_addr->sa_family != AF_INET) 686 continue; 687 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 688 if (resp == NULL) { 689 error = ENOMEM; 690 break; 691 } 692 ips = (struct ng_cisco_ipaddr *)resp->data; 693 ips->ipaddr = ((struct sockaddr_in *) 694 ifa->ifa_addr)->sin_addr; 695 ips->netmask = ((struct sockaddr_in *) 696 ifa->ifa_netmask)->sin_addr; 697 break; 698 } 699 700 /* No IP addresses on this interface? */ 701 if (ifa == NULL) 702 error = EADDRNOTAVAIL; 703 break; 704 } 705 default: 706 error = EINVAL; 707 break; 708 } 709 break; 710 default: 711 error = EINVAL; 712 break; 713 } 714 if (rptr) 715 *rptr = resp; 716 else if (resp) 717 FREE(resp, M_NETGRAPH); 718 FREE(msg, M_NETGRAPH); 719 return (error); 720 } 721 722 /* 723 * Recive data from a hook. Pass the packet to the correct input routine. 724 */ 725 static int 726 ng_iface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 727 { 728 const priv_p priv = hook->node->private; 729 const iffam_p iffam = get_iffam_from_hook(priv, hook); 730 struct ifnet *const ifp = priv->ifp; 731 732 /* Sanity checks */ 733 KASSERT(iffam != NULL, ("%s: iffam", __FUNCTION__)); 734 KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __FUNCTION__)); 735 if (m == NULL) 736 return (EINVAL); 737 if ((ifp->if_flags & IFF_UP) == 0) { 738 NG_FREE_DATA(m, meta); 739 return (ENETDOWN); 740 } 741 742 /* Update interface stats */ 743 ifp->if_ipackets++; 744 ifp->if_ibytes += m->m_pkthdr.len; 745 746 /* Note receiving interface */ 747 m->m_pkthdr.rcvif = ifp; 748 749 /* Berkeley packet filter */ 750 ng_iface_bpftap(ifp, m, iffam->family); 751 752 /* Ignore any meta-data */ 753 NG_FREE_META(meta); 754 755 /* Send packet */ 756 return family_enqueue(iffam->family, m); 757 } 758 759 /* 760 * Shutdown and remove the node and its associated interface. 761 */ 762 static int 763 ng_iface_rmnode(node_p node) 764 { 765 const priv_p priv = node->private; 766 767 ng_cutlinks(node); 768 ng_unname(node); 769 bpfdetach(priv->ifp); 770 if_detach(priv->ifp); 771 FREE(priv->ifp, M_NETGRAPH); 772 priv->ifp = NULL; 773 ng_iface_free_unit(priv->unit); 774 FREE(priv, M_NETGRAPH); 775 node->private = NULL; 776 ng_unref(node); 777 return (0); 778 } 779 780 /* 781 * Hook disconnection. Note that we do *not* shutdown when all 782 * hooks have been disconnected. 783 */ 784 static int 785 ng_iface_disconnect(hook_p hook) 786 { 787 const priv_p priv = hook->node->private; 788 const iffam_p iffam = get_iffam_from_hook(priv, hook); 789 790 if (iffam == NULL) 791 panic(__FUNCTION__); 792 *get_hook_from_iffam(priv, iffam) = NULL; 793 return (0); 794 } 795 796