1 /* 2 * ng_iface.c 3 * 4 * Copyright (c) 1996-1999 Whistle Communications, Inc. 5 * All rights reserved. 6 * 7 * Subject to the following obligations and disclaimer of warranty, use and 8 * redistribution of this software, in source or object code forms, with or 9 * without modifications are expressly permitted by Whistle Communications; 10 * provided, however, that: 11 * 1. Any and all reproductions of the source or object code must include the 12 * copyright notice above and the following disclaimer of warranties; and 13 * 2. No rights are granted, in any manner or form, to use Whistle 14 * Communications, Inc. trademarks, including the mark "WHISTLE 15 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 16 * such appears in the above copyright notice or in the software. 17 * 18 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 19 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 20 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 21 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 23 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 24 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 25 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 26 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 27 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 28 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 29 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 34 * OF SUCH DAMAGE. 35 * 36 * Author: Archie Cobbs <archie@freebsd.org> 37 * 38 * $FreeBSD$ 39 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $ 40 */ 41 42 /* 43 * This node is also a system networking interface. It has 44 * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets 45 * are simply relayed between the interface and the hooks. 46 * 47 * Interfaces are named ng0, ng1, etc. New nodes take the 48 * first available interface name. 49 * 50 * This node also includes Berkeley packet filter support. 51 */ 52 53 #include "opt_atalk.h" 54 #include "opt_inet.h" 55 #include "opt_inet6.h" 56 #include "opt_ipx.h" 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/errno.h> 61 #include <sys/kernel.h> 62 #include <sys/malloc.h> 63 #include <sys/mbuf.h> 64 #include <sys/errno.h> 65 #include <sys/random.h> 66 #include <sys/sockio.h> 67 #include <sys/socket.h> 68 #include <sys/syslog.h> 69 #include <sys/libkern.h> 70 71 #include <net/if.h> 72 #include <net/if_types.h> 73 #include <net/bpf.h> 74 #include <net/netisr.h> 75 76 #include <netinet/in.h> 77 78 #include <netgraph/ng_message.h> 79 #include <netgraph/netgraph.h> 80 #include <netgraph/ng_parse.h> 81 #include <netgraph/ng_iface.h> 82 #include <netgraph/ng_cisco.h> 83 84 #ifdef NG_SEPARATE_MALLOC 85 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node "); 86 #else 87 #define M_NETGRAPH_IFACE M_NETGRAPH 88 #endif 89 90 /* This struct describes one address family */ 91 struct iffam { 92 sa_family_t family; /* Address family */ 93 const char *hookname; /* Name for hook */ 94 }; 95 typedef const struct iffam *iffam_p; 96 97 /* List of address families supported by our interface */ 98 const static struct iffam gFamilies[] = { 99 { AF_INET, NG_IFACE_HOOK_INET }, 100 { AF_INET6, NG_IFACE_HOOK_INET6 }, 101 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 102 { AF_IPX, NG_IFACE_HOOK_IPX }, 103 { AF_ATM, NG_IFACE_HOOK_ATM }, 104 { AF_NATM, NG_IFACE_HOOK_NATM }, 105 }; 106 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 107 108 /* Node private data */ 109 struct ng_iface_private { 110 struct ifnet *ifp; /* Our interface */ 111 int unit; /* Interface unit number */ 112 node_p node; /* Our netgraph node */ 113 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 114 }; 115 typedef struct ng_iface_private *priv_p; 116 117 /* Interface methods */ 118 static void ng_iface_start(struct ifnet *ifp); 119 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 120 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 121 struct sockaddr *dst, struct rtentry *rt0); 122 static void ng_iface_bpftap(struct ifnet *ifp, 123 struct mbuf *m, sa_family_t family); 124 #ifdef DEBUG 125 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 126 #endif 127 128 /* Netgraph methods */ 129 static ng_constructor_t ng_iface_constructor; 130 static ng_rcvmsg_t ng_iface_rcvmsg; 131 static ng_shutdown_t ng_iface_shutdown; 132 static ng_newhook_t ng_iface_newhook; 133 static ng_rcvdata_t ng_iface_rcvdata; 134 static ng_disconnect_t ng_iface_disconnect; 135 136 /* Helper stuff */ 137 static iffam_p get_iffam_from_af(sa_family_t family); 138 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 139 static iffam_p get_iffam_from_name(const char *name); 140 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 141 142 /* Parse type for struct ng_iface_ifname */ 143 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { 144 NG_IFACE_IFACE_NAME_MAX + 1 145 }; 146 static const struct ng_parse_type ng_iface_ifname_type = { 147 &ng_parse_fixedstring_type, 148 &ng_iface_ifname_info 149 }; 150 151 /* Parse type for struct ng_cisco_ipaddr */ 152 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 153 = NG_CISCO_IPADDR_TYPE_INFO; 154 static const struct ng_parse_type ng_cisco_ipaddr_type = { 155 &ng_parse_struct_type, 156 &ng_cisco_ipaddr_type_fields 157 }; 158 159 /* List of commands and how to convert arguments to/from ASCII */ 160 static const struct ng_cmdlist ng_iface_cmds[] = { 161 { 162 NGM_IFACE_COOKIE, 163 NGM_IFACE_GET_IFNAME, 164 "getifname", 165 NULL, 166 &ng_iface_ifname_type 167 }, 168 { 169 NGM_IFACE_COOKIE, 170 NGM_IFACE_POINT2POINT, 171 "point2point", 172 NULL, 173 NULL 174 }, 175 { 176 NGM_IFACE_COOKIE, 177 NGM_IFACE_BROADCAST, 178 "broadcast", 179 NULL, 180 NULL 181 }, 182 { 183 NGM_CISCO_COOKIE, 184 NGM_CISCO_GET_IPADDR, 185 "getipaddr", 186 NULL, 187 &ng_cisco_ipaddr_type 188 }, 189 { 190 NGM_IFACE_COOKIE, 191 NGM_IFACE_GET_IFINDEX, 192 "getifindex", 193 NULL, 194 &ng_parse_uint32_type 195 }, 196 { 0 } 197 }; 198 199 /* Node type descriptor */ 200 static struct ng_type typestruct = { 201 .version = NG_ABI_VERSION, 202 .name = NG_IFACE_NODE_TYPE, 203 .constructor = ng_iface_constructor, 204 .rcvmsg = ng_iface_rcvmsg, 205 .shutdown = ng_iface_shutdown, 206 .newhook = ng_iface_newhook, 207 .rcvdata = ng_iface_rcvdata, 208 .disconnect = ng_iface_disconnect, 209 .cmdlist = ng_iface_cmds, 210 }; 211 NETGRAPH_INIT(iface, &typestruct); 212 213 /* We keep a bitmap indicating which unit numbers are free. 214 One means the unit number is free, zero means it's taken. */ 215 static int *ng_iface_units = NULL; 216 static int ng_iface_units_len = 0; 217 static int ng_units_in_use = 0; 218 219 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 220 221 /************************************************************************ 222 HELPER STUFF 223 ************************************************************************/ 224 225 /* 226 * Get the family descriptor from the family ID 227 */ 228 static __inline__ iffam_p 229 get_iffam_from_af(sa_family_t family) 230 { 231 iffam_p iffam; 232 int k; 233 234 for (k = 0; k < NUM_FAMILIES; k++) { 235 iffam = &gFamilies[k]; 236 if (iffam->family == family) 237 return (iffam); 238 } 239 return (NULL); 240 } 241 242 /* 243 * Get the family descriptor from the hook 244 */ 245 static __inline__ iffam_p 246 get_iffam_from_hook(priv_p priv, hook_p hook) 247 { 248 int k; 249 250 for (k = 0; k < NUM_FAMILIES; k++) 251 if (priv->hooks[k] == hook) 252 return (&gFamilies[k]); 253 return (NULL); 254 } 255 256 /* 257 * Get the hook from the iffam descriptor 258 */ 259 260 static __inline__ hook_p * 261 get_hook_from_iffam(priv_p priv, iffam_p iffam) 262 { 263 return (&priv->hooks[iffam - gFamilies]); 264 } 265 266 /* 267 * Get the iffam descriptor from the name 268 */ 269 static __inline__ iffam_p 270 get_iffam_from_name(const char *name) 271 { 272 iffam_p iffam; 273 int k; 274 275 for (k = 0; k < NUM_FAMILIES; k++) { 276 iffam = &gFamilies[k]; 277 if (!strcmp(iffam->hookname, name)) 278 return (iffam); 279 } 280 return (NULL); 281 } 282 283 /* 284 * Find the first free unit number for a new interface. 285 * Increase the size of the unit bitmap as necessary. 286 */ 287 static __inline__ int 288 ng_iface_get_unit(int *unit) 289 { 290 int index, bit; 291 292 for (index = 0; index < ng_iface_units_len 293 && ng_iface_units[index] == 0; index++); 294 if (index == ng_iface_units_len) { /* extend array */ 295 int i, *newarray, newlen; 296 297 newlen = (2 * ng_iface_units_len) + 4; 298 MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units), 299 M_NETGRAPH_IFACE, M_NOWAIT); 300 if (newarray == NULL) 301 return (ENOMEM); 302 bcopy(ng_iface_units, newarray, 303 ng_iface_units_len * sizeof(*ng_iface_units)); 304 for (i = ng_iface_units_len; i < newlen; i++) 305 newarray[i] = ~0; 306 if (ng_iface_units != NULL) 307 FREE(ng_iface_units, M_NETGRAPH_IFACE); 308 ng_iface_units = newarray; 309 ng_iface_units_len = newlen; 310 } 311 bit = ffs(ng_iface_units[index]) - 1; 312 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 313 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit)); 314 ng_iface_units[index] &= ~(1 << bit); 315 *unit = (index * UNITS_BITSPERWORD) + bit; 316 ng_units_in_use++; 317 return (0); 318 } 319 320 /* 321 * Free a no longer needed unit number. 322 */ 323 static __inline__ void 324 ng_iface_free_unit(int unit) 325 { 326 int index, bit; 327 328 index = unit / UNITS_BITSPERWORD; 329 bit = unit % UNITS_BITSPERWORD; 330 KASSERT(index < ng_iface_units_len, 331 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len)); 332 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 333 ("%s: unit=%d is free", __func__, unit)); 334 ng_iface_units[index] |= (1 << bit); 335 /* 336 * XXX We could think about reducing the size of ng_iface_units[] 337 * XXX here if the last portion is all ones 338 * XXX At least free it if no more units. 339 * Needed if we are to eventually be able to unload. 340 */ 341 ng_units_in_use--; 342 if (ng_units_in_use == 0) { /* XXX make SMP safe */ 343 FREE(ng_iface_units, M_NETGRAPH_IFACE); 344 ng_iface_units_len = 0; 345 ng_iface_units = NULL; 346 } 347 } 348 349 /************************************************************************ 350 INTERFACE STUFF 351 ************************************************************************/ 352 353 /* 354 * Process an ioctl for the virtual interface 355 */ 356 static int 357 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 358 { 359 struct ifreq *const ifr = (struct ifreq *) data; 360 int s, error = 0; 361 362 #ifdef DEBUG 363 ng_iface_print_ioctl(ifp, command, data); 364 #endif 365 s = splimp(); 366 switch (command) { 367 368 /* These two are mostly handled at a higher layer */ 369 case SIOCSIFADDR: 370 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 371 ifp->if_flags &= ~(IFF_OACTIVE); 372 break; 373 case SIOCGIFADDR: 374 break; 375 376 /* Set flags */ 377 case SIOCSIFFLAGS: 378 /* 379 * If the interface is marked up and stopped, then start it. 380 * If it is marked down and running, then stop it. 381 */ 382 if (ifr->ifr_flags & IFF_UP) { 383 if (!(ifp->if_flags & IFF_RUNNING)) { 384 ifp->if_flags &= ~(IFF_OACTIVE); 385 ifp->if_flags |= IFF_RUNNING; 386 } 387 } else { 388 if (ifp->if_flags & IFF_RUNNING) 389 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 390 } 391 break; 392 393 /* Set the interface MTU */ 394 case SIOCSIFMTU: 395 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 396 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 397 error = EINVAL; 398 else 399 ifp->if_mtu = ifr->ifr_mtu; 400 break; 401 402 /* Stuff that's not supported */ 403 case SIOCADDMULTI: 404 case SIOCDELMULTI: 405 error = 0; 406 break; 407 case SIOCSIFPHYS: 408 error = EOPNOTSUPP; 409 break; 410 411 default: 412 error = EINVAL; 413 break; 414 } 415 (void) splx(s); 416 return (error); 417 } 418 419 /* 420 * This routine is called to deliver a packet out the interface. 421 * We simply look at the address family and relay the packet to 422 * the corresponding hook, if it exists and is connected. 423 */ 424 425 static int 426 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 427 struct sockaddr *dst, struct rtentry *rt0) 428 { 429 const priv_p priv = (priv_p) ifp->if_softc; 430 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 431 int len, error = 0; 432 433 /* Check interface flags */ 434 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 435 m_freem(m); 436 return (ENETDOWN); 437 } 438 439 /* BPF writes need to be handled specially */ 440 if (dst->sa_family == AF_UNSPEC) { 441 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 442 return (ENOBUFS); 443 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 444 m->m_data += 4; 445 m->m_len -= 4; 446 m->m_pkthdr.len -= 4; 447 } 448 449 /* Berkeley packet filter */ 450 ng_iface_bpftap(ifp, m, dst->sa_family); 451 452 /* Check address family to determine hook (if known) */ 453 if (iffam == NULL) { 454 m_freem(m); 455 log(LOG_WARNING, "%s: can't handle af%d\n", 456 ifp->if_xname, (int)dst->sa_family); 457 return (EAFNOSUPPORT); 458 } 459 460 /* Copy length before the mbuf gets invalidated */ 461 len = m->m_pkthdr.len; 462 463 /* Send packet; if hook is not connected, mbuf will get freed. */ 464 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 465 466 /* Update stats */ 467 if (error == 0) { 468 ifp->if_obytes += len; 469 ifp->if_opackets++; 470 } 471 return (error); 472 } 473 474 /* 475 * This routine should never be called 476 */ 477 478 static void 479 ng_iface_start(struct ifnet *ifp) 480 { 481 if_printf(ifp, "%s called?", __func__); 482 } 483 484 /* 485 * Flash a packet by the BPF (requires prepending 4 byte AF header) 486 * Note the phoney mbuf; this is OK because BPF treats it read-only. 487 */ 488 static void 489 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 490 { 491 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 492 if (ifp->if_bpf != NULL) { 493 int32_t family4 = (int32_t)family; 494 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 495 } 496 } 497 498 #ifdef DEBUG 499 /* 500 * Display an ioctl to the virtual interface 501 */ 502 503 static void 504 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 505 { 506 char *str; 507 508 switch (command & IOC_DIRMASK) { 509 case IOC_VOID: 510 str = "IO"; 511 break; 512 case IOC_OUT: 513 str = "IOR"; 514 break; 515 case IOC_IN: 516 str = "IOW"; 517 break; 518 case IOC_INOUT: 519 str = "IORW"; 520 break; 521 default: 522 str = "IO??"; 523 } 524 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 525 ifp->if_xname, 526 str, 527 IOCGROUP(command), 528 command & 0xff, 529 IOCPARM_LEN(command)); 530 } 531 #endif /* DEBUG */ 532 533 /************************************************************************ 534 NETGRAPH NODE STUFF 535 ************************************************************************/ 536 537 /* 538 * Constructor for a node 539 */ 540 static int 541 ng_iface_constructor(node_p node) 542 { 543 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 544 struct ifnet *ifp; 545 priv_p priv; 546 int error = 0; 547 548 /* Allocate node and interface private structures */ 549 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 550 if (priv == NULL) 551 return (ENOMEM); 552 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 553 if (ifp == NULL) { 554 FREE(priv, M_NETGRAPH_IFACE); 555 return (ENOMEM); 556 } 557 558 /* Link them together */ 559 ifp->if_softc = priv; 560 priv->ifp = ifp; 561 562 /* Get an interface unit number */ 563 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 564 FREE(ifp, M_NETGRAPH_IFACE); 565 FREE(priv, M_NETGRAPH_IFACE); 566 return (error); 567 } 568 569 /* Link together node and private info */ 570 NG_NODE_SET_PRIVATE(node, priv); 571 priv->node = node; 572 573 /* Initialize interface structure */ 574 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 575 ifp->if_output = ng_iface_output; 576 ifp->if_start = ng_iface_start; 577 ifp->if_ioctl = ng_iface_ioctl; 578 ifp->if_watchdog = NULL; 579 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 580 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 581 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 582 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 583 ifp->if_addrlen = 0; /* XXX */ 584 ifp->if_hdrlen = 0; /* XXX */ 585 ifp->if_baudrate = 64000; /* XXX */ 586 TAILQ_INIT(&ifp->if_addrhead); 587 588 /* Give this node the same name as the interface (if possible) */ 589 bzero(ifname, sizeof(ifname)); 590 strlcpy(ifname, ifp->if_xname, sizeof(ifname)); 591 if (ng_name_node(node, ifname) != 0) 592 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 593 594 /* Attach the interface */ 595 if_attach(ifp); 596 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 597 598 /* Done */ 599 return (0); 600 } 601 602 /* 603 * Give our ok for a hook to be added 604 */ 605 static int 606 ng_iface_newhook(node_p node, hook_p hook, const char *name) 607 { 608 const iffam_p iffam = get_iffam_from_name(name); 609 hook_p *hookptr; 610 611 if (iffam == NULL) 612 return (EPFNOSUPPORT); 613 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 614 if (*hookptr != NULL) 615 return (EISCONN); 616 *hookptr = hook; 617 return (0); 618 } 619 620 /* 621 * Receive a control message 622 */ 623 static int 624 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 625 { 626 const priv_p priv = NG_NODE_PRIVATE(node); 627 struct ifnet *const ifp = priv->ifp; 628 struct ng_mesg *resp = NULL; 629 int error = 0; 630 struct ng_mesg *msg; 631 632 NGI_GET_MSG(item, msg); 633 switch (msg->header.typecookie) { 634 case NGM_IFACE_COOKIE: 635 switch (msg->header.cmd) { 636 case NGM_IFACE_GET_IFNAME: 637 { 638 struct ng_iface_ifname *arg; 639 640 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 641 if (resp == NULL) { 642 error = ENOMEM; 643 break; 644 } 645 arg = (struct ng_iface_ifname *)resp->data; 646 strlcpy(arg->ngif_name, ifp->if_xname, 647 sizeof(arg->ngif_name)); 648 break; 649 } 650 651 case NGM_IFACE_POINT2POINT: 652 case NGM_IFACE_BROADCAST: 653 { 654 655 /* Deny request if interface is UP */ 656 if ((ifp->if_flags & IFF_UP) != 0) 657 return (EBUSY); 658 659 /* Change flags */ 660 switch (msg->header.cmd) { 661 case NGM_IFACE_POINT2POINT: 662 ifp->if_flags |= IFF_POINTOPOINT; 663 ifp->if_flags &= ~IFF_BROADCAST; 664 break; 665 case NGM_IFACE_BROADCAST: 666 ifp->if_flags &= ~IFF_POINTOPOINT; 667 ifp->if_flags |= IFF_BROADCAST; 668 break; 669 } 670 break; 671 } 672 673 case NGM_IFACE_GET_IFINDEX: 674 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 675 if (resp == NULL) { 676 error = ENOMEM; 677 break; 678 } 679 *((uint32_t *)resp->data) = priv->ifp->if_index; 680 break; 681 682 default: 683 error = EINVAL; 684 break; 685 } 686 break; 687 case NGM_CISCO_COOKIE: 688 switch (msg->header.cmd) { 689 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 690 { 691 struct ifaddr *ifa; 692 693 /* Return the first configured IP address */ 694 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 695 struct ng_cisco_ipaddr *ips; 696 697 if (ifa->ifa_addr->sa_family != AF_INET) 698 continue; 699 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 700 if (resp == NULL) { 701 error = ENOMEM; 702 break; 703 } 704 ips = (struct ng_cisco_ipaddr *)resp->data; 705 ips->ipaddr = ((struct sockaddr_in *) 706 ifa->ifa_addr)->sin_addr; 707 ips->netmask = ((struct sockaddr_in *) 708 ifa->ifa_netmask)->sin_addr; 709 break; 710 } 711 712 /* No IP addresses on this interface? */ 713 if (ifa == NULL) 714 error = EADDRNOTAVAIL; 715 break; 716 } 717 default: 718 error = EINVAL; 719 break; 720 } 721 break; 722 default: 723 error = EINVAL; 724 break; 725 } 726 NG_RESPOND_MSG(error, node, item, resp); 727 NG_FREE_MSG(msg); 728 return (error); 729 } 730 731 /* 732 * Recive data from a hook. Pass the packet to the correct input routine. 733 */ 734 static int 735 ng_iface_rcvdata(hook_p hook, item_p item) 736 { 737 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 738 const iffam_p iffam = get_iffam_from_hook(priv, hook); 739 struct ifnet *const ifp = priv->ifp; 740 struct mbuf *m; 741 int isr; 742 743 NGI_GET_M(item, m); 744 NG_FREE_ITEM(item); 745 /* Sanity checks */ 746 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 747 M_ASSERTPKTHDR(m); 748 if ((ifp->if_flags & IFF_UP) == 0) { 749 NG_FREE_M(m); 750 return (ENETDOWN); 751 } 752 753 /* Update interface stats */ 754 ifp->if_ipackets++; 755 ifp->if_ibytes += m->m_pkthdr.len; 756 757 /* Note receiving interface */ 758 m->m_pkthdr.rcvif = ifp; 759 760 /* Berkeley packet filter */ 761 ng_iface_bpftap(ifp, m, iffam->family); 762 763 /* Send packet */ 764 switch (iffam->family) { 765 #ifdef INET 766 case AF_INET: 767 isr = NETISR_IP; 768 break; 769 #endif 770 #ifdef INET6 771 case AF_INET6: 772 isr = NETISR_IPV6; 773 break; 774 #endif 775 #ifdef IPX 776 case AF_IPX: 777 isr = NETISR_IPX; 778 break; 779 #endif 780 #ifdef NETATALK 781 case AF_APPLETALK: 782 isr = NETISR_ATALK2; 783 break; 784 #endif 785 default: 786 m_freem(m); 787 return (EAFNOSUPPORT); 788 } 789 /* First chunk of an mbuf contains good junk */ 790 if (harvest.point_to_point) 791 random_harvest(m, 16, 3, 0, RANDOM_NET); 792 netisr_dispatch(isr, m); 793 return (0); 794 } 795 796 /* 797 * Shutdown and remove the node and its associated interface. 798 */ 799 static int 800 ng_iface_shutdown(node_p node) 801 { 802 const priv_p priv = NG_NODE_PRIVATE(node); 803 804 bpfdetach(priv->ifp); 805 if_detach(priv->ifp); 806 FREE(priv->ifp, M_NETGRAPH_IFACE); 807 priv->ifp = NULL; 808 ng_iface_free_unit(priv->unit); 809 FREE(priv, M_NETGRAPH_IFACE); 810 NG_NODE_SET_PRIVATE(node, NULL); 811 NG_NODE_UNREF(node); 812 return (0); 813 } 814 815 /* 816 * Hook disconnection. Note that we do *not* shutdown when all 817 * hooks have been disconnected. 818 */ 819 static int 820 ng_iface_disconnect(hook_p hook) 821 { 822 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 823 const iffam_p iffam = get_iffam_from_hook(priv, hook); 824 825 if (iffam == NULL) 826 panic(__func__); 827 *get_hook_from_iffam(priv, iffam) = NULL; 828 return (0); 829 } 830 831