1 /* 2 * ng_iface.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: Archie Cobbs <archie@freebsd.org> 39 * 40 * $FreeBSD$ 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/lock.h> 65 #include <sys/malloc.h> 66 #include <sys/mbuf.h> 67 #include <sys/mutex.h> 68 #include <sys/errno.h> 69 #include <sys/random.h> 70 #include <sys/sockio.h> 71 #include <sys/socket.h> 72 #include <sys/syslog.h> 73 #include <sys/libkern.h> 74 75 #include <net/if.h> 76 #include <net/if_types.h> 77 #include <net/bpf.h> 78 #include <net/netisr.h> 79 80 #include <netinet/in.h> 81 82 #include <netgraph/ng_message.h> 83 #include <netgraph/netgraph.h> 84 #include <netgraph/ng_parse.h> 85 #include <netgraph/ng_iface.h> 86 #include <netgraph/ng_cisco.h> 87 88 #ifdef NG_SEPARATE_MALLOC 89 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node "); 90 #else 91 #define M_NETGRAPH_IFACE M_NETGRAPH 92 #endif 93 94 /* This struct describes one address family */ 95 struct iffam { 96 sa_family_t family; /* Address family */ 97 const char *hookname; /* Name for hook */ 98 }; 99 typedef const struct iffam *iffam_p; 100 101 /* List of address families supported by our interface */ 102 const static struct iffam gFamilies[] = { 103 { AF_INET, NG_IFACE_HOOK_INET }, 104 { AF_INET6, NG_IFACE_HOOK_INET6 }, 105 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 106 { AF_IPX, NG_IFACE_HOOK_IPX }, 107 { AF_ATM, NG_IFACE_HOOK_ATM }, 108 { AF_NATM, NG_IFACE_HOOK_NATM }, 109 }; 110 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 111 112 /* Node private data */ 113 struct ng_iface_private { 114 struct ifnet *ifp; /* Our interface */ 115 int unit; /* Interface unit number */ 116 node_p node; /* Our netgraph node */ 117 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 118 }; 119 typedef struct ng_iface_private *priv_p; 120 121 /* Interface methods */ 122 static void ng_iface_start(struct ifnet *ifp); 123 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 124 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 125 struct sockaddr *dst, struct rtentry *rt0); 126 static void ng_iface_bpftap(struct ifnet *ifp, 127 struct mbuf *m, sa_family_t family); 128 #ifdef DEBUG 129 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 130 #endif 131 132 /* Netgraph methods */ 133 static int ng_iface_mod_event(module_t, int, void *); 134 static ng_constructor_t ng_iface_constructor; 135 static ng_rcvmsg_t ng_iface_rcvmsg; 136 static ng_shutdown_t ng_iface_shutdown; 137 static ng_newhook_t ng_iface_newhook; 138 static ng_rcvdata_t ng_iface_rcvdata; 139 static ng_disconnect_t ng_iface_disconnect; 140 141 /* Helper stuff */ 142 static iffam_p get_iffam_from_af(sa_family_t family); 143 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 144 static iffam_p get_iffam_from_name(const char *name); 145 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 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_parse_string_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 { 186 NGM_IFACE_COOKIE, 187 NGM_IFACE_GET_IFINDEX, 188 "getifindex", 189 NULL, 190 &ng_parse_uint32_type 191 }, 192 { 0 } 193 }; 194 195 /* Node type descriptor */ 196 static struct ng_type typestruct = { 197 .version = NG_ABI_VERSION, 198 .name = NG_IFACE_NODE_TYPE, 199 .mod_event = ng_iface_mod_event, 200 .constructor = ng_iface_constructor, 201 .rcvmsg = ng_iface_rcvmsg, 202 .shutdown = ng_iface_shutdown, 203 .newhook = ng_iface_newhook, 204 .rcvdata = ng_iface_rcvdata, 205 .disconnect = ng_iface_disconnect, 206 .cmdlist = ng_iface_cmds, 207 }; 208 NETGRAPH_INIT(iface, &typestruct); 209 210 /* We keep a bitmap indicating which unit numbers are free. 211 One means the unit number is free, zero means it's taken. */ 212 static int *ng_iface_units = NULL; 213 static int ng_iface_units_len = 0; 214 static int ng_units_in_use = 0; 215 216 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 217 218 static struct mtx ng_iface_mtx; 219 220 /************************************************************************ 221 HELPER STUFF 222 ************************************************************************/ 223 224 /* 225 * Get the family descriptor from the family ID 226 */ 227 static __inline iffam_p 228 get_iffam_from_af(sa_family_t family) 229 { 230 iffam_p iffam; 231 int k; 232 233 for (k = 0; k < NUM_FAMILIES; k++) { 234 iffam = &gFamilies[k]; 235 if (iffam->family == family) 236 return (iffam); 237 } 238 return (NULL); 239 } 240 241 /* 242 * Get the family descriptor from the hook 243 */ 244 static __inline iffam_p 245 get_iffam_from_hook(priv_p priv, hook_p hook) 246 { 247 int k; 248 249 for (k = 0; k < NUM_FAMILIES; k++) 250 if (priv->hooks[k] == hook) 251 return (&gFamilies[k]); 252 return (NULL); 253 } 254 255 /* 256 * Get the hook from the iffam descriptor 257 */ 258 259 static __inline hook_p * 260 get_hook_from_iffam(priv_p priv, iffam_p iffam) 261 { 262 return (&priv->hooks[iffam - gFamilies]); 263 } 264 265 /* 266 * Get the iffam descriptor from the name 267 */ 268 static __inline iffam_p 269 get_iffam_from_name(const char *name) 270 { 271 iffam_p iffam; 272 int k; 273 274 for (k = 0; k < NUM_FAMILIES; k++) { 275 iffam = &gFamilies[k]; 276 if (!strcmp(iffam->hookname, name)) 277 return (iffam); 278 } 279 return (NULL); 280 } 281 282 /* 283 * Find the first free unit number for a new interface. 284 * Increase the size of the unit bitmap as necessary. 285 */ 286 static __inline int 287 ng_iface_get_unit(int *unit) 288 { 289 int index, bit; 290 291 mtx_lock(&ng_iface_mtx); 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 mtx_unlock(&ng_iface_mtx); 302 return (ENOMEM); 303 } 304 bcopy(ng_iface_units, newarray, 305 ng_iface_units_len * sizeof(*ng_iface_units)); 306 for (i = ng_iface_units_len; i < newlen; i++) 307 newarray[i] = ~0; 308 if (ng_iface_units != NULL) 309 FREE(ng_iface_units, M_NETGRAPH_IFACE); 310 ng_iface_units = newarray; 311 ng_iface_units_len = newlen; 312 } 313 bit = ffs(ng_iface_units[index]) - 1; 314 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 315 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit)); 316 ng_iface_units[index] &= ~(1 << bit); 317 *unit = (index * UNITS_BITSPERWORD) + bit; 318 ng_units_in_use++; 319 mtx_unlock(&ng_iface_mtx); 320 return (0); 321 } 322 323 /* 324 * Free a no longer needed unit number. 325 */ 326 static __inline void 327 ng_iface_free_unit(int unit) 328 { 329 int index, bit; 330 331 index = unit / UNITS_BITSPERWORD; 332 bit = unit % UNITS_BITSPERWORD; 333 mtx_lock(&ng_iface_mtx); 334 KASSERT(index < ng_iface_units_len, 335 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len)); 336 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 337 ("%s: unit=%d is free", __func__, unit)); 338 ng_iface_units[index] |= (1 << bit); 339 /* 340 * XXX We could think about reducing the size of ng_iface_units[] 341 * XXX here if the last portion is all ones 342 * XXX At least free it if no more units. 343 * Needed if we are to eventually be able to unload. 344 */ 345 ng_units_in_use--; 346 if (ng_units_in_use == 0) { /* XXX make SMP safe */ 347 FREE(ng_iface_units, M_NETGRAPH_IFACE); 348 ng_iface_units_len = 0; 349 ng_iface_units = NULL; 350 } 351 mtx_unlock(&ng_iface_mtx); 352 } 353 354 /************************************************************************ 355 INTERFACE STUFF 356 ************************************************************************/ 357 358 /* 359 * Process an ioctl for the virtual interface 360 */ 361 static int 362 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 363 { 364 struct ifreq *const ifr = (struct ifreq *) data; 365 int s, error = 0; 366 367 #ifdef DEBUG 368 ng_iface_print_ioctl(ifp, command, data); 369 #endif 370 s = splimp(); 371 switch (command) { 372 373 /* These two are mostly handled at a higher layer */ 374 case SIOCSIFADDR: 375 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 376 ifp->if_flags &= ~(IFF_OACTIVE); 377 break; 378 case SIOCGIFADDR: 379 break; 380 381 /* Set flags */ 382 case SIOCSIFFLAGS: 383 /* 384 * If the interface is marked up and stopped, then start it. 385 * If it is marked down and running, then stop it. 386 */ 387 if (ifr->ifr_flags & IFF_UP) { 388 if (!(ifp->if_flags & IFF_RUNNING)) { 389 ifp->if_flags &= ~(IFF_OACTIVE); 390 ifp->if_flags |= IFF_RUNNING; 391 } 392 } else { 393 if (ifp->if_flags & IFF_RUNNING) 394 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 395 } 396 break; 397 398 /* Set the interface MTU */ 399 case SIOCSIFMTU: 400 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 401 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 402 error = EINVAL; 403 else 404 ifp->if_mtu = ifr->ifr_mtu; 405 break; 406 407 /* Stuff that's not supported */ 408 case SIOCADDMULTI: 409 case SIOCDELMULTI: 410 error = 0; 411 break; 412 case SIOCSIFPHYS: 413 error = EOPNOTSUPP; 414 break; 415 416 default: 417 error = EINVAL; 418 break; 419 } 420 (void) splx(s); 421 return (error); 422 } 423 424 /* 425 * This routine is called to deliver a packet out the interface. 426 * We simply look at the address family and relay the packet to 427 * the corresponding hook, if it exists and is connected. 428 */ 429 430 static int 431 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 432 struct sockaddr *dst, struct rtentry *rt0) 433 { 434 const priv_p priv = (priv_p) ifp->if_softc; 435 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 436 int len, error = 0; 437 438 /* Check interface flags */ 439 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 440 m_freem(m); 441 return (ENETDOWN); 442 } 443 444 /* BPF writes need to be handled specially */ 445 if (dst->sa_family == AF_UNSPEC) { 446 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 447 return (ENOBUFS); 448 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 449 m->m_data += 4; 450 m->m_len -= 4; 451 m->m_pkthdr.len -= 4; 452 } 453 454 /* Berkeley packet filter */ 455 ng_iface_bpftap(ifp, m, dst->sa_family); 456 457 /* Check address family to determine hook (if known) */ 458 if (iffam == NULL) { 459 m_freem(m); 460 log(LOG_WARNING, "%s: can't handle af%d\n", 461 ifp->if_xname, (int)dst->sa_family); 462 return (EAFNOSUPPORT); 463 } 464 465 /* Copy length before the mbuf gets invalidated */ 466 len = m->m_pkthdr.len; 467 468 /* Send packet; if hook is not connected, mbuf will get freed. */ 469 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 470 471 /* Update stats */ 472 if (error == 0) { 473 ifp->if_obytes += len; 474 ifp->if_opackets++; 475 } 476 return (error); 477 } 478 479 /* 480 * This routine should never be called 481 */ 482 483 static void 484 ng_iface_start(struct ifnet *ifp) 485 { 486 if_printf(ifp, "%s called?", __func__); 487 } 488 489 /* 490 * Flash a packet by the BPF (requires prepending 4 byte AF header) 491 * Note the phoney mbuf; this is OK because BPF treats it read-only. 492 */ 493 static void 494 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 495 { 496 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 497 if (ifp->if_bpf != NULL) { 498 int32_t family4 = (int32_t)family; 499 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 500 } 501 } 502 503 #ifdef DEBUG 504 /* 505 * Display an ioctl to the virtual interface 506 */ 507 508 static void 509 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 510 { 511 char *str; 512 513 switch (command & IOC_DIRMASK) { 514 case IOC_VOID: 515 str = "IO"; 516 break; 517 case IOC_OUT: 518 str = "IOR"; 519 break; 520 case IOC_IN: 521 str = "IOW"; 522 break; 523 case IOC_INOUT: 524 str = "IORW"; 525 break; 526 default: 527 str = "IO??"; 528 } 529 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 530 ifp->if_xname, 531 str, 532 IOCGROUP(command), 533 command & 0xff, 534 IOCPARM_LEN(command)); 535 } 536 #endif /* DEBUG */ 537 538 /************************************************************************ 539 NETGRAPH NODE STUFF 540 ************************************************************************/ 541 542 /* 543 * Constructor for a node 544 */ 545 static int 546 ng_iface_constructor(node_p node) 547 { 548 struct ifnet *ifp; 549 priv_p priv; 550 int error = 0; 551 552 /* Allocate node and interface private structures */ 553 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 554 if (priv == NULL) 555 return (ENOMEM); 556 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 557 if (ifp == NULL) { 558 FREE(priv, M_NETGRAPH_IFACE); 559 return (ENOMEM); 560 } 561 562 /* Link them together */ 563 ifp->if_softc = priv; 564 priv->ifp = ifp; 565 566 /* Get an interface unit number */ 567 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 568 FREE(ifp, M_NETGRAPH_IFACE); 569 FREE(priv, M_NETGRAPH_IFACE); 570 return (error); 571 } 572 573 /* Link together node and private info */ 574 NG_NODE_SET_PRIVATE(node, priv); 575 priv->node = node; 576 577 /* Initialize interface structure */ 578 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 579 ifp->if_output = ng_iface_output; 580 ifp->if_start = ng_iface_start; 581 ifp->if_ioctl = ng_iface_ioctl; 582 ifp->if_watchdog = NULL; 583 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 584 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 585 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 586 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 587 ifp->if_addrlen = 0; /* XXX */ 588 ifp->if_hdrlen = 0; /* XXX */ 589 ifp->if_baudrate = 64000; /* XXX */ 590 TAILQ_INIT(&ifp->if_addrhead); 591 592 /* Give this node the same name as the interface (if possible) */ 593 if (ng_name_node(node, ifp->if_xname) != 0) 594 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 595 ifp->if_xname); 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(NG_NODE_PRIVATE(node), 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, item_p item, hook_p lasthook) 628 { 629 const priv_p priv = NG_NODE_PRIVATE(node); 630 struct ifnet *const ifp = priv->ifp; 631 struct ng_mesg *resp = NULL; 632 int error = 0; 633 struct ng_mesg *msg; 634 635 NGI_GET_MSG(item, msg); 636 switch (msg->header.typecookie) { 637 case NGM_IFACE_COOKIE: 638 switch (msg->header.cmd) { 639 case NGM_IFACE_GET_IFNAME: 640 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 641 if (resp == NULL) { 642 error = ENOMEM; 643 break; 644 } 645 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 646 break; 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 case NGM_IFACE_GET_IFINDEX: 671 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 672 if (resp == NULL) { 673 error = ENOMEM; 674 break; 675 } 676 *((uint32_t *)resp->data) = priv->ifp->if_index; 677 break; 678 679 default: 680 error = EINVAL; 681 break; 682 } 683 break; 684 case NGM_CISCO_COOKIE: 685 switch (msg->header.cmd) { 686 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 687 { 688 struct ifaddr *ifa; 689 690 /* Return the first configured IP address */ 691 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 692 struct ng_cisco_ipaddr *ips; 693 694 if (ifa->ifa_addr->sa_family != AF_INET) 695 continue; 696 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 697 if (resp == NULL) { 698 error = ENOMEM; 699 break; 700 } 701 ips = (struct ng_cisco_ipaddr *)resp->data; 702 ips->ipaddr = ((struct sockaddr_in *) 703 ifa->ifa_addr)->sin_addr; 704 ips->netmask = ((struct sockaddr_in *) 705 ifa->ifa_netmask)->sin_addr; 706 break; 707 } 708 709 /* No IP addresses on this interface? */ 710 if (ifa == NULL) 711 error = EADDRNOTAVAIL; 712 break; 713 } 714 default: 715 error = EINVAL; 716 break; 717 } 718 break; 719 case NGM_FLOW_COOKIE: 720 switch (msg->header.cmd) { 721 case NGM_LINK_IS_UP: 722 ifp->if_flags |= IFF_RUNNING; 723 break; 724 case NGM_LINK_IS_DOWN: 725 ifp->if_flags &= ~IFF_RUNNING; 726 break; 727 default: 728 break; 729 } 730 break; 731 default: 732 error = EINVAL; 733 break; 734 } 735 NG_RESPOND_MSG(error, node, item, resp); 736 NG_FREE_MSG(msg); 737 return (error); 738 } 739 740 /* 741 * Recive data from a hook. Pass the packet to the correct input routine. 742 */ 743 static int 744 ng_iface_rcvdata(hook_p hook, item_p item) 745 { 746 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 747 const iffam_p iffam = get_iffam_from_hook(priv, hook); 748 struct ifnet *const ifp = priv->ifp; 749 struct mbuf *m; 750 int isr; 751 752 NGI_GET_M(item, m); 753 NG_FREE_ITEM(item); 754 /* Sanity checks */ 755 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 756 M_ASSERTPKTHDR(m); 757 if ((ifp->if_flags & IFF_UP) == 0) { 758 NG_FREE_M(m); 759 return (ENETDOWN); 760 } 761 762 /* Update interface stats */ 763 ifp->if_ipackets++; 764 ifp->if_ibytes += m->m_pkthdr.len; 765 766 /* Note receiving interface */ 767 m->m_pkthdr.rcvif = ifp; 768 769 /* Berkeley packet filter */ 770 ng_iface_bpftap(ifp, m, iffam->family); 771 772 /* Send packet */ 773 switch (iffam->family) { 774 #ifdef INET 775 case AF_INET: 776 isr = NETISR_IP; 777 break; 778 #endif 779 #ifdef INET6 780 case AF_INET6: 781 isr = NETISR_IPV6; 782 break; 783 #endif 784 #ifdef IPX 785 case AF_IPX: 786 isr = NETISR_IPX; 787 break; 788 #endif 789 #ifdef NETATALK 790 case AF_APPLETALK: 791 isr = NETISR_ATALK2; 792 break; 793 #endif 794 default: 795 m_freem(m); 796 return (EAFNOSUPPORT); 797 } 798 /* First chunk of an mbuf contains good junk */ 799 if (harvest.point_to_point) 800 random_harvest(m, 16, 3, 0, RANDOM_NET); 801 netisr_dispatch(isr, m); 802 return (0); 803 } 804 805 /* 806 * Shutdown and remove the node and its associated interface. 807 */ 808 static int 809 ng_iface_shutdown(node_p node) 810 { 811 const priv_p priv = NG_NODE_PRIVATE(node); 812 813 bpfdetach(priv->ifp); 814 if_detach(priv->ifp); 815 FREE(priv->ifp, M_NETGRAPH_IFACE); 816 priv->ifp = NULL; 817 ng_iface_free_unit(priv->unit); 818 FREE(priv, M_NETGRAPH_IFACE); 819 NG_NODE_SET_PRIVATE(node, NULL); 820 NG_NODE_UNREF(node); 821 return (0); 822 } 823 824 /* 825 * Hook disconnection. Note that we do *not* shutdown when all 826 * hooks have been disconnected. 827 */ 828 static int 829 ng_iface_disconnect(hook_p hook) 830 { 831 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 832 const iffam_p iffam = get_iffam_from_hook(priv, hook); 833 834 if (iffam == NULL) 835 panic(__func__); 836 *get_hook_from_iffam(priv, iffam) = NULL; 837 return (0); 838 } 839 840 /* 841 * Handle loading and unloading for this node type. 842 */ 843 static int 844 ng_iface_mod_event(module_t mod, int event, void *data) 845 { 846 int error = 0; 847 848 switch (event) { 849 case MOD_LOAD: 850 mtx_init(&ng_iface_mtx, "ng_iface", NULL, MTX_DEF); 851 break; 852 case MOD_UNLOAD: 853 mtx_destroy(&ng_iface_mtx); 854 break; 855 default: 856 error = EOPNOTSUPP; 857 break; 858 } 859 return (error); 860 } 861