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 1.5 2003/09/16 06:25:35 hsu 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 "opt_atalk.h" 56 #include "opt_inet.h" 57 #include "opt_inet6.h" 58 #include "opt_ipx.h" 59 60 #include <sys/param.h> 61 #include <sys/systm.h> 62 #include <sys/errno.h> 63 #include <sys/kernel.h> 64 #include <sys/malloc.h> 65 #include <sys/mbuf.h> 66 #include <sys/errno.h> 67 #include <sys/sockio.h> 68 #include <sys/socket.h> 69 #include <sys/syslog.h> 70 #include <sys/libkern.h> 71 72 #include <net/if.h> 73 #include <net/if_types.h> 74 #include <net/netisr.h> 75 #include <net/bpf.h> 76 77 #include <netinet/in.h> 78 79 #include <netgraph/ng_message.h> 80 #include <netgraph/netgraph.h> 81 #include <netgraph/ng_parse.h> 82 #include "ng_iface.h" 83 #include <netgraph/cisco/ng_cisco.h> 84 85 /* This struct describes one address family */ 86 struct iffam { 87 sa_family_t family; /* Address family */ 88 const char *hookname; /* Name for hook */ 89 }; 90 typedef const struct iffam *iffam_p; 91 92 /* List of address families supported by our interface */ 93 const static struct iffam gFamilies[] = { 94 { AF_INET, NG_IFACE_HOOK_INET }, 95 { AF_INET6, NG_IFACE_HOOK_INET6 }, 96 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 97 { AF_IPX, NG_IFACE_HOOK_IPX }, 98 { AF_ATM, NG_IFACE_HOOK_ATM }, 99 { AF_NATM, NG_IFACE_HOOK_NATM }, 100 { AF_NS, NG_IFACE_HOOK_NS }, 101 }; 102 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 103 104 /* Node private data */ 105 struct ng_iface_private { 106 struct ifnet *ifp; /* Our interface */ 107 int unit; /* Interface unit number */ 108 node_p node; /* Our netgraph node */ 109 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 110 }; 111 typedef struct ng_iface_private *priv_p; 112 113 /* Interface methods */ 114 static void ng_iface_start(struct ifnet *ifp); 115 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 116 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 117 struct sockaddr *dst, struct rtentry *rt0); 118 static void ng_iface_bpftap(struct ifnet *ifp, 119 struct mbuf *m, sa_family_t family); 120 #ifdef DEBUG 121 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 122 #endif 123 124 /* Netgraph methods */ 125 static ng_constructor_t ng_iface_constructor; 126 static ng_rcvmsg_t ng_iface_rcvmsg; 127 static ng_shutdown_t ng_iface_rmnode; 128 static ng_newhook_t ng_iface_newhook; 129 static ng_rcvdata_t ng_iface_rcvdata; 130 static ng_disconnect_t ng_iface_disconnect; 131 132 /* Helper stuff */ 133 static iffam_p get_iffam_from_af(sa_family_t family); 134 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 135 static iffam_p get_iffam_from_name(const char *name); 136 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 137 138 /* Parse type for struct ng_iface_ifname */ 139 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { 140 NG_IFACE_IFACE_NAME_MAX + 1 141 }; 142 static const struct ng_parse_type ng_iface_ifname_type = { 143 &ng_parse_fixedstring_type, 144 &ng_iface_ifname_info 145 }; 146 147 /* Parse type for struct ng_cisco_ipaddr */ 148 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 149 = NG_CISCO_IPADDR_TYPE_INFO; 150 static const struct ng_parse_type ng_cisco_ipaddr_type = { 151 &ng_parse_struct_type, 152 &ng_cisco_ipaddr_type_fields 153 }; 154 155 /* List of commands and how to convert arguments to/from ASCII */ 156 static const struct ng_cmdlist ng_iface_cmds[] = { 157 { 158 NGM_IFACE_COOKIE, 159 NGM_IFACE_GET_IFNAME, 160 "getifname", 161 NULL, 162 &ng_iface_ifname_type 163 }, 164 { 165 NGM_IFACE_COOKIE, 166 NGM_IFACE_POINT2POINT, 167 "point2point", 168 NULL, 169 NULL 170 }, 171 { 172 NGM_IFACE_COOKIE, 173 NGM_IFACE_BROADCAST, 174 "broadcast", 175 NULL, 176 NULL 177 }, 178 { 179 NGM_CISCO_COOKIE, 180 NGM_CISCO_GET_IPADDR, 181 "getipaddr", 182 NULL, 183 &ng_cisco_ipaddr_type 184 }, 185 { 0 } 186 }; 187 188 /* Node type descriptor */ 189 static struct ng_type typestruct = { 190 NG_VERSION, 191 NG_IFACE_NODE_TYPE, 192 NULL, 193 ng_iface_constructor, 194 ng_iface_rcvmsg, 195 ng_iface_rmnode, 196 ng_iface_newhook, 197 NULL, 198 NULL, 199 ng_iface_rcvdata, 200 ng_iface_rcvdata, 201 ng_iface_disconnect, 202 ng_iface_cmds 203 }; 204 NETGRAPH_INIT(iface, &typestruct); 205 206 /* We keep a bitmap indicating which unit numbers are free. 207 One means the unit number is free, zero means it's taken. */ 208 static int *ng_iface_units = NULL; 209 static int ng_iface_units_len = 0; 210 211 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 212 213 /************************************************************************ 214 HELPER STUFF 215 ************************************************************************/ 216 217 /* 218 * Get the family descriptor from the family ID 219 */ 220 static __inline__ iffam_p 221 get_iffam_from_af(sa_family_t family) 222 { 223 iffam_p iffam; 224 int k; 225 226 for (k = 0; k < NUM_FAMILIES; k++) { 227 iffam = &gFamilies[k]; 228 if (iffam->family == family) 229 return (iffam); 230 } 231 return (NULL); 232 } 233 234 /* 235 * Get the family descriptor from the hook 236 */ 237 static __inline__ iffam_p 238 get_iffam_from_hook(priv_p priv, hook_p hook) 239 { 240 int k; 241 242 for (k = 0; k < NUM_FAMILIES; k++) 243 if (priv->hooks[k] == hook) 244 return (&gFamilies[k]); 245 return (NULL); 246 } 247 248 /* 249 * Get the hook from the iffam descriptor 250 */ 251 252 static __inline__ hook_p * 253 get_hook_from_iffam(priv_p priv, iffam_p iffam) 254 { 255 return (&priv->hooks[iffam - gFamilies]); 256 } 257 258 /* 259 * Get the iffam descriptor from the name 260 */ 261 static __inline__ iffam_p 262 get_iffam_from_name(const char *name) 263 { 264 iffam_p iffam; 265 int k; 266 267 for (k = 0; k < NUM_FAMILIES; k++) { 268 iffam = &gFamilies[k]; 269 if (!strcmp(iffam->hookname, name)) 270 return (iffam); 271 } 272 return (NULL); 273 } 274 275 /* 276 * Find the first free unit number for a new interface. 277 * Increase the size of the unit bitmap as necessary. 278 */ 279 static __inline__ int 280 ng_iface_get_unit(int *unit) 281 { 282 int index, bit; 283 284 for (index = 0; index < ng_iface_units_len 285 && ng_iface_units[index] == 0; index++); 286 if (index == ng_iface_units_len) { /* extend array */ 287 int i, *newarray, newlen; 288 289 newlen = (2 * ng_iface_units_len) + 4; 290 MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units), 291 M_NETGRAPH, M_NOWAIT); 292 if (newarray == NULL) 293 return (ENOMEM); 294 bcopy(ng_iface_units, newarray, 295 ng_iface_units_len * sizeof(*ng_iface_units)); 296 for (i = ng_iface_units_len; i < newlen; i++) 297 newarray[i] = ~0; 298 if (ng_iface_units != NULL) 299 FREE(ng_iface_units, M_NETGRAPH); 300 ng_iface_units = newarray; 301 ng_iface_units_len = newlen; 302 } 303 bit = ffs(ng_iface_units[index]) - 1; 304 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 305 ("%s: word=%d bit=%d", __FUNCTION__, ng_iface_units[index], bit)); 306 ng_iface_units[index] &= ~(1 << bit); 307 *unit = (index * UNITS_BITSPERWORD) + bit; 308 return (0); 309 } 310 311 /* 312 * Free a no longer needed unit number. 313 */ 314 static __inline__ void 315 ng_iface_free_unit(int unit) 316 { 317 int index, bit; 318 319 index = unit / UNITS_BITSPERWORD; 320 bit = unit % UNITS_BITSPERWORD; 321 KASSERT(index < ng_iface_units_len, 322 ("%s: unit=%d len=%d", __FUNCTION__, unit, ng_iface_units_len)); 323 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 324 ("%s: unit=%d is free", __FUNCTION__, unit)); 325 ng_iface_units[index] |= (1 << bit); 326 /* 327 * XXX We could think about reducing the size of ng_iface_units[] 328 * XXX here if the last portion is all ones 329 */ 330 } 331 332 /************************************************************************ 333 INTERFACE STUFF 334 ************************************************************************/ 335 336 /* 337 * Process an ioctl for the virtual interface 338 */ 339 static int 340 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 341 { 342 struct ifreq *const ifr = (struct ifreq *) data; 343 int s, error = 0; 344 345 #ifdef DEBUG 346 ng_iface_print_ioctl(ifp, command, data); 347 #endif 348 s = splimp(); 349 switch (command) { 350 351 /* These two are mostly handled at a higher layer */ 352 case SIOCSIFADDR: 353 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 354 ifp->if_flags &= ~(IFF_OACTIVE); 355 break; 356 case SIOCGIFADDR: 357 break; 358 359 /* Set flags */ 360 case SIOCSIFFLAGS: 361 /* 362 * If the interface is marked up and stopped, then start it. 363 * If it is marked down and running, then stop it. 364 */ 365 if (ifr->ifr_flags & IFF_UP) { 366 if (!(ifp->if_flags & IFF_RUNNING)) { 367 ifp->if_flags &= ~(IFF_OACTIVE); 368 ifp->if_flags |= IFF_RUNNING; 369 } 370 } else { 371 if (ifp->if_flags & IFF_RUNNING) 372 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 373 } 374 break; 375 376 /* Set the interface MTU */ 377 case SIOCSIFMTU: 378 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 379 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 380 error = EINVAL; 381 else 382 ifp->if_mtu = ifr->ifr_mtu; 383 break; 384 385 /* Stuff that's not supported */ 386 case SIOCADDMULTI: 387 case SIOCDELMULTI: 388 error = 0; 389 break; 390 case SIOCSIFPHYS: 391 error = EOPNOTSUPP; 392 break; 393 394 default: 395 error = EINVAL; 396 break; 397 } 398 (void) splx(s); 399 return (error); 400 } 401 402 /* 403 * This routine is called to deliver a packet out the interface. 404 * We simply look at the address family and relay the packet to 405 * the corresponding hook, if it exists and is connected. 406 */ 407 408 static int 409 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 410 struct sockaddr *dst, struct rtentry *rt0) 411 { 412 const priv_p priv = (priv_p) ifp->if_softc; 413 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 414 meta_p meta = NULL; 415 int len, error = 0; 416 417 /* Check interface flags */ 418 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 419 m_freem(m); 420 return (ENETDOWN); 421 } 422 423 /* BPF writes need to be handled specially */ 424 if (dst->sa_family == AF_UNSPEC) { 425 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 426 return (ENOBUFS); 427 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 428 m->m_data += 4; 429 m->m_len -= 4; 430 m->m_pkthdr.len -= 4; 431 } 432 433 /* Berkeley packet filter */ 434 ng_iface_bpftap(ifp, m, dst->sa_family); 435 436 /* Check address family to determine hook (if known) */ 437 if (iffam == NULL) { 438 m_freem(m); 439 log(LOG_WARNING, "%s%d: can't handle af%d\n", 440 ifp->if_name, ifp->if_unit, (int)dst->sa_family); 441 return (EAFNOSUPPORT); 442 } 443 444 /* Copy length before the mbuf gets invalidated */ 445 len = m->m_pkthdr.len; 446 447 /* Send packet; if hook is not connected, mbuf will get freed. */ 448 NG_SEND_DATA(error, *get_hook_from_iffam(priv, iffam), m, meta); 449 450 /* Update stats */ 451 if (error == 0) { 452 ifp->if_obytes += len; 453 ifp->if_opackets++; 454 } 455 return (error); 456 } 457 458 /* 459 * This routine should never be called 460 */ 461 462 static void 463 ng_iface_start(struct ifnet *ifp) 464 { 465 printf("%s%d: %s called?", ifp->if_name, ifp->if_unit, __FUNCTION__); 466 } 467 468 /* 469 * Flash a packet by the BPF (requires prepending 4 byte AF header) 470 * Note the phoney mbuf; this is OK because BPF treats it read-only. 471 */ 472 static void 473 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 474 { 475 int32_t family4 = (int32_t)family; 476 struct mbuf m0; 477 478 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __FUNCTION__)); 479 if (ifp->if_bpf != NULL) { 480 bzero(&m0, sizeof(m0)); 481 m0.m_next = m; 482 m0.m_len = sizeof(family4); 483 m0.m_data = (char *)&family4; 484 bpf_mtap(ifp, &m0); 485 } 486 } 487 488 #ifdef DEBUG 489 /* 490 * Display an ioctl to the virtual interface 491 */ 492 493 static void 494 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 495 { 496 char *str; 497 498 switch (command & IOC_DIRMASK) { 499 case IOC_VOID: 500 str = "IO"; 501 break; 502 case IOC_OUT: 503 str = "IOR"; 504 break; 505 case IOC_IN: 506 str = "IOW"; 507 break; 508 case IOC_INOUT: 509 str = "IORW"; 510 break; 511 default: 512 str = "IO??"; 513 } 514 log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n", 515 ifp->if_name, ifp->if_unit, 516 str, 517 IOCGROUP(command), 518 command & 0xff, 519 IOCPARM_LEN(command)); 520 } 521 #endif /* DEBUG */ 522 523 /************************************************************************ 524 NETGRAPH NODE STUFF 525 ************************************************************************/ 526 527 /* 528 * Constructor for a node 529 */ 530 static int 531 ng_iface_constructor(node_p *nodep) 532 { 533 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 534 struct ifnet *ifp; 535 node_p node; 536 priv_p priv; 537 int error = 0; 538 539 /* Allocate node and interface private structures */ 540 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT); 541 if (priv == NULL) 542 return (ENOMEM); 543 bzero(priv, sizeof(*priv)); 544 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH, M_NOWAIT); 545 if (ifp == NULL) { 546 FREE(priv, M_NETGRAPH); 547 return (ENOMEM); 548 } 549 bzero(ifp, sizeof(*ifp)); 550 551 /* Link them together */ 552 ifp->if_softc = priv; 553 priv->ifp = ifp; 554 555 /* Get an interface unit number */ 556 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 557 FREE(ifp, M_NETGRAPH); 558 FREE(priv, M_NETGRAPH); 559 return (error); 560 } 561 562 /* Call generic node constructor */ 563 if ((error = ng_make_node_common(&typestruct, nodep)) != 0) { 564 ng_iface_free_unit(priv->unit); 565 FREE(ifp, M_NETGRAPH); 566 FREE(priv, M_NETGRAPH); 567 return (error); 568 } 569 node = *nodep; 570 571 /* Link together node and private info */ 572 node->private = priv; 573 priv->node = node; 574 575 /* Initialize interface structure */ 576 ifp->if_name = NG_IFACE_IFACE_NAME; 577 ifp->if_unit = priv->unit; 578 ifp->if_output = ng_iface_output; 579 ifp->if_start = ng_iface_start; 580 ifp->if_ioctl = ng_iface_ioctl; 581 ifp->if_watchdog = NULL; 582 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 583 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 584 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 585 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 586 ifp->if_addrlen = 0; /* XXX */ 587 ifp->if_hdrlen = 0; /* XXX */ 588 ifp->if_baudrate = 64000; /* XXX */ 589 TAILQ_INIT(&ifp->if_addrhead); 590 591 /* Give this node the same name as the interface (if possible) */ 592 bzero(ifname, sizeof(ifname)); 593 snprintf(ifname, sizeof(ifname), "%s%d", ifp->if_name, ifp->if_unit); 594 if (ng_name_node(node, ifname) != 0) 595 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 596 597 /* Attach the interface */ 598 if_attach(ifp); 599 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 600 601 /* Done */ 602 return (0); 603 } 604 605 /* 606 * Give our ok for a hook to be added 607 */ 608 static int 609 ng_iface_newhook(node_p node, hook_p hook, const char *name) 610 { 611 const iffam_p iffam = get_iffam_from_name(name); 612 hook_p *hookptr; 613 614 if (iffam == NULL) 615 return (EPFNOSUPPORT); 616 hookptr = get_hook_from_iffam((priv_p) node->private, iffam); 617 if (*hookptr != NULL) 618 return (EISCONN); 619 *hookptr = hook; 620 return (0); 621 } 622 623 /* 624 * Receive a control message 625 */ 626 static int 627 ng_iface_rcvmsg(node_p node, struct ng_mesg *msg, 628 const char *retaddr, struct ng_mesg **rptr) 629 { 630 const priv_p priv = node->private; 631 struct ifnet *const ifp = priv->ifp; 632 struct ng_mesg *resp = NULL; 633 int error = 0; 634 635 switch (msg->header.typecookie) { 636 case NGM_IFACE_COOKIE: 637 switch (msg->header.cmd) { 638 case NGM_IFACE_GET_IFNAME: 639 { 640 struct ng_iface_ifname *arg; 641 642 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 643 if (resp == NULL) { 644 error = ENOMEM; 645 break; 646 } 647 arg = (struct ng_iface_ifname *)resp->data; 648 snprintf(arg->ngif_name, sizeof(arg->ngif_name), 649 "%s%d", ifp->if_name, ifp->if_unit); 650 break; 651 } 652 653 case NGM_IFACE_POINT2POINT: 654 case NGM_IFACE_BROADCAST: 655 { 656 657 /* Deny request if interface is UP */ 658 if ((ifp->if_flags & IFF_UP) != 0) 659 return (EBUSY); 660 661 /* Change flags */ 662 switch (msg->header.cmd) { 663 case NGM_IFACE_POINT2POINT: 664 ifp->if_flags |= IFF_POINTOPOINT; 665 ifp->if_flags &= ~IFF_BROADCAST; 666 break; 667 case NGM_IFACE_BROADCAST: 668 ifp->if_flags &= ~IFF_POINTOPOINT; 669 ifp->if_flags |= IFF_BROADCAST; 670 break; 671 } 672 break; 673 } 674 675 default: 676 error = EINVAL; 677 break; 678 } 679 break; 680 case NGM_CISCO_COOKIE: 681 switch (msg->header.cmd) { 682 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 683 { 684 struct ifaddr *ifa; 685 686 /* Return the first configured IP address */ 687 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 688 struct ng_cisco_ipaddr *ips; 689 690 if (ifa->ifa_addr->sa_family != AF_INET) 691 continue; 692 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 693 if (resp == NULL) { 694 error = ENOMEM; 695 break; 696 } 697 ips = (struct ng_cisco_ipaddr *)resp->data; 698 ips->ipaddr = ((struct sockaddr_in *) 699 ifa->ifa_addr)->sin_addr; 700 ips->netmask = ((struct sockaddr_in *) 701 ifa->ifa_netmask)->sin_addr; 702 break; 703 } 704 705 /* No IP addresses on this interface? */ 706 if (ifa == NULL) 707 error = EADDRNOTAVAIL; 708 break; 709 } 710 default: 711 error = EINVAL; 712 break; 713 } 714 break; 715 default: 716 error = EINVAL; 717 break; 718 } 719 if (rptr) 720 *rptr = resp; 721 else if (resp) 722 FREE(resp, M_NETGRAPH); 723 FREE(msg, M_NETGRAPH); 724 return (error); 725 } 726 727 /* 728 * Recive data from a hook. Pass the packet to the correct input routine. 729 */ 730 static int 731 ng_iface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 732 { 733 const priv_p priv = hook->node->private; 734 const iffam_p iffam = get_iffam_from_hook(priv, hook); 735 struct ifnet *const ifp = priv->ifp; 736 int isr; 737 738 /* Sanity checks */ 739 KASSERT(iffam != NULL, ("%s: iffam", __FUNCTION__)); 740 KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __FUNCTION__)); 741 if (m == NULL) 742 return (EINVAL); 743 if ((ifp->if_flags & IFF_UP) == 0) { 744 NG_FREE_DATA(m, meta); 745 return (ENETDOWN); 746 } 747 748 /* Update interface stats */ 749 ifp->if_ipackets++; 750 ifp->if_ibytes += m->m_pkthdr.len; 751 752 /* Note receiving interface */ 753 m->m_pkthdr.rcvif = ifp; 754 755 /* Berkeley packet filter */ 756 ng_iface_bpftap(ifp, m, iffam->family); 757 758 /* Ignore any meta-data */ 759 NG_FREE_META(meta); 760 761 /* Send packet */ 762 switch (iffam->family) { 763 #ifdef INET 764 case AF_INET: 765 isr = NETISR_IP; 766 break; 767 #endif 768 #ifdef INET6 769 case AF_INET6: 770 isr = NETISR_IPV6; 771 break; 772 #endif 773 #ifdef IPX 774 case AF_IPX: 775 isr = NETISR_IPX; 776 break; 777 #endif 778 #ifdef NETATALK 779 case AF_APPLETALK: 780 isr = NETISR_ATALK2; 781 break; 782 #endif 783 default: 784 m_freem(m); 785 return (EAFNOSUPPORT); 786 } 787 netisr_dispatch(isr, m); 788 return (0); 789 } 790 791 /* 792 * Shutdown and remove the node and its associated interface. 793 */ 794 static int 795 ng_iface_rmnode(node_p node) 796 { 797 const priv_p priv = node->private; 798 799 ng_cutlinks(node); 800 ng_unname(node); 801 bpfdetach(priv->ifp); 802 if_detach(priv->ifp); 803 FREE(priv->ifp, M_NETGRAPH); 804 priv->ifp = NULL; 805 ng_iface_free_unit(priv->unit); 806 FREE(priv, M_NETGRAPH); 807 node->private = NULL; 808 ng_unref(node); 809 return (0); 810 } 811 812 /* 813 * Hook disconnection. Note that we do *not* shutdown when all 814 * hooks have been disconnected. 815 */ 816 static int 817 ng_iface_disconnect(hook_p hook) 818 { 819 const priv_p priv = hook->node->private; 820 const iffam_p iffam = get_iffam_from_hook(priv, hook); 821 822 if (iffam == NULL) 823 panic(__FUNCTION__); 824 *get_hook_from_iffam(priv, iffam) = NULL; 825 return (0); 826 } 827 828