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/malloc.h> 65 #include <sys/mbuf.h> 66 #include <sys/errno.h> 67 #include <sys/proc.h> 68 #include <sys/random.h> 69 #include <sys/sockio.h> 70 #include <sys/socket.h> 71 #include <sys/syslog.h> 72 #include <sys/libkern.h> 73 74 #include <net/if.h> 75 #include <net/if_types.h> 76 #include <net/bpf.h> 77 #include <net/netisr.h> 78 #include <net/route.h> 79 #include <net/vnet.h> 80 81 #include <netinet/in.h> 82 83 #include <netgraph/ng_message.h> 84 #include <netgraph/netgraph.h> 85 #include <netgraph/ng_parse.h> 86 #include <netgraph/ng_iface.h> 87 #include <netgraph/ng_cisco.h> 88 89 #ifdef NG_SEPARATE_MALLOC 90 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node "); 91 #else 92 #define M_NETGRAPH_IFACE M_NETGRAPH 93 #endif 94 95 /* This struct describes one address family */ 96 struct iffam { 97 sa_family_t family; /* Address family */ 98 const char *hookname; /* Name for hook */ 99 }; 100 typedef const struct iffam *iffam_p; 101 102 /* List of address families supported by our interface */ 103 const static struct iffam gFamilies[] = { 104 { AF_INET, NG_IFACE_HOOK_INET }, 105 { AF_INET6, NG_IFACE_HOOK_INET6 }, 106 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 107 { AF_IPX, NG_IFACE_HOOK_IPX }, 108 { AF_ATM, NG_IFACE_HOOK_ATM }, 109 { AF_NATM, NG_IFACE_HOOK_NATM }, 110 }; 111 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 112 113 /* Node private data */ 114 struct ng_iface_private { 115 struct ifnet *ifp; /* Our interface */ 116 int unit; /* Interface unit number */ 117 node_p node; /* Our netgraph node */ 118 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 119 }; 120 typedef struct ng_iface_private *priv_p; 121 122 /* Interface methods */ 123 static void ng_iface_start(struct ifnet *ifp); 124 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 125 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 126 struct sockaddr *dst, struct route *ro); 127 static void ng_iface_bpftap(struct ifnet *ifp, 128 struct mbuf *m, sa_family_t family); 129 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 130 sa_family_t sa); 131 #ifdef DEBUG 132 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 133 #endif 134 135 /* Netgraph methods */ 136 static int ng_iface_mod_event(module_t, int, void *); 137 static ng_constructor_t ng_iface_constructor; 138 static ng_rcvmsg_t ng_iface_rcvmsg; 139 static ng_shutdown_t ng_iface_shutdown; 140 static ng_newhook_t ng_iface_newhook; 141 static ng_rcvdata_t ng_iface_rcvdata; 142 static ng_disconnect_t ng_iface_disconnect; 143 144 /* Helper stuff */ 145 static iffam_p get_iffam_from_af(sa_family_t family); 146 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 147 static iffam_p get_iffam_from_name(const char *name); 148 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 149 150 /* Parse type for struct ng_cisco_ipaddr */ 151 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 152 = NG_CISCO_IPADDR_TYPE_INFO; 153 static const struct ng_parse_type ng_cisco_ipaddr_type = { 154 &ng_parse_struct_type, 155 &ng_cisco_ipaddr_type_fields 156 }; 157 158 /* List of commands and how to convert arguments to/from ASCII */ 159 static const struct ng_cmdlist ng_iface_cmds[] = { 160 { 161 NGM_IFACE_COOKIE, 162 NGM_IFACE_GET_IFNAME, 163 "getifname", 164 NULL, 165 &ng_parse_string_type 166 }, 167 { 168 NGM_IFACE_COOKIE, 169 NGM_IFACE_POINT2POINT, 170 "point2point", 171 NULL, 172 NULL 173 }, 174 { 175 NGM_IFACE_COOKIE, 176 NGM_IFACE_BROADCAST, 177 "broadcast", 178 NULL, 179 NULL 180 }, 181 { 182 NGM_CISCO_COOKIE, 183 NGM_CISCO_GET_IPADDR, 184 "getipaddr", 185 NULL, 186 &ng_cisco_ipaddr_type 187 }, 188 { 189 NGM_IFACE_COOKIE, 190 NGM_IFACE_GET_IFINDEX, 191 "getifindex", 192 NULL, 193 &ng_parse_uint32_type 194 }, 195 { 0 } 196 }; 197 198 /* Node type descriptor */ 199 static struct ng_type typestruct = { 200 .version = NG_ABI_VERSION, 201 .name = NG_IFACE_NODE_TYPE, 202 .mod_event = ng_iface_mod_event, 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 static VNET_DEFINE(struct unrhdr *, ng_iface_unit); 214 #define V_ng_iface_unit VNET(ng_iface_unit) 215 216 /************************************************************************ 217 HELPER STUFF 218 ************************************************************************/ 219 220 /* 221 * Get the family descriptor from the family ID 222 */ 223 static __inline iffam_p 224 get_iffam_from_af(sa_family_t family) 225 { 226 iffam_p iffam; 227 int k; 228 229 for (k = 0; k < NUM_FAMILIES; k++) { 230 iffam = &gFamilies[k]; 231 if (iffam->family == family) 232 return (iffam); 233 } 234 return (NULL); 235 } 236 237 /* 238 * Get the family descriptor from the hook 239 */ 240 static __inline iffam_p 241 get_iffam_from_hook(priv_p priv, hook_p hook) 242 { 243 int k; 244 245 for (k = 0; k < NUM_FAMILIES; k++) 246 if (priv->hooks[k] == hook) 247 return (&gFamilies[k]); 248 return (NULL); 249 } 250 251 /* 252 * Get the hook from the iffam descriptor 253 */ 254 255 static __inline hook_p * 256 get_hook_from_iffam(priv_p priv, iffam_p iffam) 257 { 258 return (&priv->hooks[iffam - gFamilies]); 259 } 260 261 /* 262 * Get the iffam descriptor from the name 263 */ 264 static __inline iffam_p 265 get_iffam_from_name(const char *name) 266 { 267 iffam_p iffam; 268 int k; 269 270 for (k = 0; k < NUM_FAMILIES; k++) { 271 iffam = &gFamilies[k]; 272 if (!strcmp(iffam->hookname, name)) 273 return (iffam); 274 } 275 return (NULL); 276 } 277 278 /************************************************************************ 279 INTERFACE STUFF 280 ************************************************************************/ 281 282 /* 283 * Process an ioctl for the virtual interface 284 */ 285 static int 286 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 287 { 288 struct ifreq *const ifr = (struct ifreq *) data; 289 int error = 0; 290 291 #ifdef DEBUG 292 ng_iface_print_ioctl(ifp, command, data); 293 #endif 294 switch (command) { 295 296 /* These two are mostly handled at a higher layer */ 297 case SIOCSIFADDR: 298 ifp->if_flags |= IFF_UP; 299 ifp->if_drv_flags |= IFF_DRV_RUNNING; 300 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 301 break; 302 case SIOCGIFADDR: 303 break; 304 305 /* Set flags */ 306 case SIOCSIFFLAGS: 307 /* 308 * If the interface is marked up and stopped, then start it. 309 * If it is marked down and running, then stop it. 310 */ 311 if (ifr->ifr_flags & IFF_UP) { 312 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 313 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 314 ifp->if_drv_flags |= IFF_DRV_RUNNING; 315 } 316 } else { 317 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 318 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 319 IFF_DRV_OACTIVE); 320 } 321 break; 322 323 /* Set the interface MTU */ 324 case SIOCSIFMTU: 325 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 326 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 327 error = EINVAL; 328 else 329 ifp->if_mtu = ifr->ifr_mtu; 330 break; 331 332 /* Stuff that's not supported */ 333 case SIOCADDMULTI: 334 case SIOCDELMULTI: 335 error = 0; 336 break; 337 case SIOCSIFPHYS: 338 error = EOPNOTSUPP; 339 break; 340 341 default: 342 error = EINVAL; 343 break; 344 } 345 return (error); 346 } 347 348 /* 349 * This routine is called to deliver a packet out the interface. 350 * We simply look at the address family and relay the packet to 351 * the corresponding hook, if it exists and is connected. 352 */ 353 354 static int 355 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 356 struct sockaddr *dst, struct route *ro) 357 { 358 struct m_tag *mtag; 359 uint32_t af; 360 int error; 361 362 /* Check interface flags */ 363 if (!((ifp->if_flags & IFF_UP) && 364 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 365 m_freem(m); 366 return (ENETDOWN); 367 } 368 369 /* Protect from deadly infinite recursion. */ 370 mtag = NULL; 371 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) { 372 if (*(struct ifnet **)(mtag + 1) == ifp) { 373 log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname); 374 m_freem(m); 375 return (EDEADLK); 376 } 377 } 378 mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *), 379 M_NOWAIT); 380 if (mtag == NULL) { 381 m_freem(m); 382 return (ENOMEM); 383 } 384 *(struct ifnet **)(mtag + 1) = ifp; 385 m_tag_prepend(m, mtag); 386 387 /* BPF writes need to be handled specially. */ 388 if (dst->sa_family == AF_UNSPEC) { 389 bcopy(dst->sa_data, &af, sizeof(af)); 390 dst->sa_family = af; 391 } 392 393 /* Berkeley packet filter */ 394 ng_iface_bpftap(ifp, m, dst->sa_family); 395 396 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 397 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT); 398 if (m == NULL) { 399 IFQ_LOCK(&ifp->if_snd); 400 IFQ_INC_DROPS(&ifp->if_snd); 401 IFQ_UNLOCK(&ifp->if_snd); 402 ifp->if_oerrors++; 403 return (ENOBUFS); 404 } 405 *(sa_family_t *)m->m_data = dst->sa_family; 406 error = (ifp->if_transmit)(ifp, m); 407 } else 408 error = ng_iface_send(ifp, m, dst->sa_family); 409 410 return (error); 411 } 412 413 /* 414 * Start method is used only when ALTQ is enabled. 415 */ 416 static void 417 ng_iface_start(struct ifnet *ifp) 418 { 419 struct mbuf *m; 420 sa_family_t sa; 421 422 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 423 424 for(;;) { 425 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 426 if (m == NULL) 427 break; 428 sa = *mtod(m, sa_family_t *); 429 m_adj(m, sizeof(sa_family_t)); 430 ng_iface_send(ifp, m, sa); 431 } 432 } 433 434 /* 435 * Flash a packet by the BPF (requires prepending 4 byte AF header) 436 * Note the phoney mbuf; this is OK because BPF treats it read-only. 437 */ 438 static void 439 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 440 { 441 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 442 if (bpf_peers_present(ifp->if_bpf)) { 443 int32_t family4 = (int32_t)family; 444 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 445 } 446 } 447 448 /* 449 * This routine does actual delivery of the packet into the 450 * netgraph(4). It is called from ng_iface_start() and 451 * ng_iface_output(). 452 */ 453 static int 454 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 455 { 456 const priv_p priv = (priv_p) ifp->if_softc; 457 const iffam_p iffam = get_iffam_from_af(sa); 458 int error; 459 int len; 460 461 /* Check address family to determine hook (if known) */ 462 if (iffam == NULL) { 463 m_freem(m); 464 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 465 return (EAFNOSUPPORT); 466 } 467 468 /* Copy length before the mbuf gets invalidated. */ 469 len = m->m_pkthdr.len; 470 471 /* Send packet. If hook is not connected, mbuf will get freed. */ 472 NG_OUTBOUND_THREAD_REF(); 473 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 474 NG_OUTBOUND_THREAD_UNREF(); 475 476 /* Update stats. */ 477 if (error == 0) { 478 ifp->if_obytes += len; 479 ifp->if_opackets++; 480 } 481 482 return (error); 483 } 484 485 #ifdef DEBUG 486 /* 487 * Display an ioctl to the virtual interface 488 */ 489 490 static void 491 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 492 { 493 char *str; 494 495 switch (command & IOC_DIRMASK) { 496 case IOC_VOID: 497 str = "IO"; 498 break; 499 case IOC_OUT: 500 str = "IOR"; 501 break; 502 case IOC_IN: 503 str = "IOW"; 504 break; 505 case IOC_INOUT: 506 str = "IORW"; 507 break; 508 default: 509 str = "IO??"; 510 } 511 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 512 ifp->if_xname, 513 str, 514 IOCGROUP(command), 515 command & 0xff, 516 IOCPARM_LEN(command)); 517 } 518 #endif /* DEBUG */ 519 520 /************************************************************************ 521 NETGRAPH NODE STUFF 522 ************************************************************************/ 523 524 /* 525 * Constructor for a node 526 */ 527 static int 528 ng_iface_constructor(node_p node) 529 { 530 struct ifnet *ifp; 531 priv_p priv; 532 533 /* Allocate node and interface private structures */ 534 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 535 if (priv == NULL) 536 return (ENOMEM); 537 ifp = if_alloc(IFT_PROPVIRTUAL); 538 if (ifp == NULL) { 539 free(priv, M_NETGRAPH_IFACE); 540 return (ENOMEM); 541 } 542 543 /* Link them together */ 544 ifp->if_softc = priv; 545 priv->ifp = ifp; 546 547 /* Get an interface unit number */ 548 priv->unit = alloc_unr(V_ng_iface_unit); 549 550 /* Link together node and private info */ 551 NG_NODE_SET_PRIVATE(node, priv); 552 priv->node = node; 553 554 /* Initialize interface structure */ 555 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 556 ifp->if_output = ng_iface_output; 557 ifp->if_start = ng_iface_start; 558 ifp->if_ioctl = ng_iface_ioctl; 559 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 560 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 561 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 562 ifp->if_addrlen = 0; /* XXX */ 563 ifp->if_hdrlen = 0; /* XXX */ 564 ifp->if_baudrate = 64000; /* XXX */ 565 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 566 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 567 IFQ_SET_READY(&ifp->if_snd); 568 569 /* Give this node the same name as the interface (if possible) */ 570 if (ng_name_node(node, ifp->if_xname) != 0) 571 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 572 ifp->if_xname); 573 574 /* Attach the interface */ 575 if_attach(ifp); 576 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 577 578 /* Done */ 579 return (0); 580 } 581 582 /* 583 * Give our ok for a hook to be added 584 */ 585 static int 586 ng_iface_newhook(node_p node, hook_p hook, const char *name) 587 { 588 const iffam_p iffam = get_iffam_from_name(name); 589 hook_p *hookptr; 590 591 if (iffam == NULL) 592 return (EPFNOSUPPORT); 593 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 594 if (*hookptr != NULL) 595 return (EISCONN); 596 *hookptr = hook; 597 NG_HOOK_HI_STACK(hook); 598 NG_HOOK_SET_TO_INBOUND(hook); 599 return (0); 600 } 601 602 /* 603 * Receive a control message 604 */ 605 static int 606 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 607 { 608 const priv_p priv = NG_NODE_PRIVATE(node); 609 struct ifnet *const ifp = priv->ifp; 610 struct ng_mesg *resp = NULL; 611 int error = 0; 612 struct ng_mesg *msg; 613 614 NGI_GET_MSG(item, msg); 615 switch (msg->header.typecookie) { 616 case NGM_IFACE_COOKIE: 617 switch (msg->header.cmd) { 618 case NGM_IFACE_GET_IFNAME: 619 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 620 if (resp == NULL) { 621 error = ENOMEM; 622 break; 623 } 624 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 625 break; 626 627 case NGM_IFACE_POINT2POINT: 628 case NGM_IFACE_BROADCAST: 629 { 630 631 /* Deny request if interface is UP */ 632 if ((ifp->if_flags & IFF_UP) != 0) 633 return (EBUSY); 634 635 /* Change flags */ 636 switch (msg->header.cmd) { 637 case NGM_IFACE_POINT2POINT: 638 ifp->if_flags |= IFF_POINTOPOINT; 639 ifp->if_flags &= ~IFF_BROADCAST; 640 break; 641 case NGM_IFACE_BROADCAST: 642 ifp->if_flags &= ~IFF_POINTOPOINT; 643 ifp->if_flags |= IFF_BROADCAST; 644 break; 645 } 646 break; 647 } 648 649 case NGM_IFACE_GET_IFINDEX: 650 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 651 if (resp == NULL) { 652 error = ENOMEM; 653 break; 654 } 655 *((uint32_t *)resp->data) = priv->ifp->if_index; 656 break; 657 658 default: 659 error = EINVAL; 660 break; 661 } 662 break; 663 case NGM_CISCO_COOKIE: 664 switch (msg->header.cmd) { 665 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 666 { 667 struct ifaddr *ifa; 668 669 /* Return the first configured IP address */ 670 if_addr_rlock(ifp); 671 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 672 struct ng_cisco_ipaddr *ips; 673 674 if (ifa->ifa_addr->sa_family != AF_INET) 675 continue; 676 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 677 if (resp == NULL) { 678 error = ENOMEM; 679 break; 680 } 681 ips = (struct ng_cisco_ipaddr *)resp->data; 682 ips->ipaddr = ((struct sockaddr_in *) 683 ifa->ifa_addr)->sin_addr; 684 ips->netmask = ((struct sockaddr_in *) 685 ifa->ifa_netmask)->sin_addr; 686 break; 687 } 688 if_addr_runlock(ifp); 689 690 /* No IP addresses on this interface? */ 691 if (ifa == NULL) 692 error = EADDRNOTAVAIL; 693 break; 694 } 695 default: 696 error = EINVAL; 697 break; 698 } 699 break; 700 case NGM_FLOW_COOKIE: 701 switch (msg->header.cmd) { 702 case NGM_LINK_IS_UP: 703 ifp->if_drv_flags |= IFF_DRV_RUNNING; 704 break; 705 case NGM_LINK_IS_DOWN: 706 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 707 break; 708 default: 709 break; 710 } 711 break; 712 default: 713 error = EINVAL; 714 break; 715 } 716 NG_RESPOND_MSG(error, node, item, resp); 717 NG_FREE_MSG(msg); 718 return (error); 719 } 720 721 /* 722 * Recive data from a hook. Pass the packet to the correct input routine. 723 */ 724 static int 725 ng_iface_rcvdata(hook_p hook, item_p item) 726 { 727 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 728 const iffam_p iffam = get_iffam_from_hook(priv, hook); 729 struct ifnet *const ifp = priv->ifp; 730 struct mbuf *m; 731 int isr; 732 733 NGI_GET_M(item, m); 734 NG_FREE_ITEM(item); 735 /* Sanity checks */ 736 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 737 M_ASSERTPKTHDR(m); 738 if ((ifp->if_flags & IFF_UP) == 0) { 739 NG_FREE_M(m); 740 return (ENETDOWN); 741 } 742 743 /* Update interface stats */ 744 ifp->if_ipackets++; 745 ifp->if_ibytes += m->m_pkthdr.len; 746 747 /* Note receiving interface */ 748 m->m_pkthdr.rcvif = ifp; 749 750 /* Berkeley packet filter */ 751 ng_iface_bpftap(ifp, m, iffam->family); 752 753 /* Send packet */ 754 switch (iffam->family) { 755 #ifdef INET 756 case AF_INET: 757 isr = NETISR_IP; 758 break; 759 #endif 760 #ifdef INET6 761 case AF_INET6: 762 isr = NETISR_IPV6; 763 break; 764 #endif 765 #ifdef IPX 766 case AF_IPX: 767 isr = NETISR_IPX; 768 break; 769 #endif 770 #ifdef NETATALK 771 case AF_APPLETALK: 772 isr = NETISR_ATALK2; 773 break; 774 #endif 775 default: 776 m_freem(m); 777 return (EAFNOSUPPORT); 778 } 779 /* First chunk of an mbuf contains good junk */ 780 if (harvest.point_to_point) 781 random_harvest(m, 16, 3, 0, RANDOM_NET); 782 netisr_dispatch(isr, m); 783 return (0); 784 } 785 786 /* 787 * Shutdown and remove the node and its associated interface. 788 */ 789 static int 790 ng_iface_shutdown(node_p node) 791 { 792 const priv_p priv = NG_NODE_PRIVATE(node); 793 794 /* 795 * The ifnet may be in a different vnet than the netgraph node, 796 * hence we have to change the current vnet context here. 797 */ 798 CURVNET_SET_QUIET(priv->ifp->if_vnet); 799 bpfdetach(priv->ifp); 800 if_detach(priv->ifp); 801 if_free(priv->ifp); 802 CURVNET_RESTORE(); 803 priv->ifp = NULL; 804 free_unr(V_ng_iface_unit, priv->unit); 805 free(priv, M_NETGRAPH_IFACE); 806 NG_NODE_SET_PRIVATE(node, NULL); 807 NG_NODE_UNREF(node); 808 return (0); 809 } 810 811 /* 812 * Hook disconnection. Note that we do *not* shutdown when all 813 * hooks have been disconnected. 814 */ 815 static int 816 ng_iface_disconnect(hook_p hook) 817 { 818 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 819 const iffam_p iffam = get_iffam_from_hook(priv, hook); 820 821 if (iffam == NULL) 822 panic("%s", __func__); 823 *get_hook_from_iffam(priv, iffam) = NULL; 824 return (0); 825 } 826 827 /* 828 * Handle loading and unloading for this node type. 829 */ 830 static int 831 ng_iface_mod_event(module_t mod, int event, void *data) 832 { 833 int error = 0; 834 835 switch (event) { 836 case MOD_LOAD: 837 case MOD_UNLOAD: 838 break; 839 default: 840 error = EOPNOTSUPP; 841 break; 842 } 843 return (error); 844 } 845 846 static void 847 vnet_ng_iface_init(const void *unused) 848 { 849 850 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 851 } 852 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 853 vnet_ng_iface_init, NULL); 854 855 static void 856 vnet_ng_iface_uninit(const void *unused) 857 { 858 859 delete_unrhdr(V_ng_iface_unit); 860 } 861 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 862 vnet_ng_iface_uninit, NULL); 863