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_var.h> 76 #include <net/if_types.h> 77 #include <net/bpf.h> 78 #include <net/netisr.h> 79 #include <net/route.h> 80 #include <net/vnet.h> 81 82 #include <netinet/in.h> 83 84 #include <netgraph/ng_message.h> 85 #include <netgraph/netgraph.h> 86 #include <netgraph/ng_parse.h> 87 #include <netgraph/ng_iface.h> 88 #include <netgraph/ng_cisco.h> 89 90 #ifdef NG_SEPARATE_MALLOC 91 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node"); 92 #else 93 #define M_NETGRAPH_IFACE M_NETGRAPH 94 #endif 95 96 /* This struct describes one address family */ 97 struct iffam { 98 sa_family_t family; /* Address family */ 99 const char *hookname; /* Name for hook */ 100 }; 101 typedef const struct iffam *iffam_p; 102 103 /* List of address families supported by our interface */ 104 const static struct iffam gFamilies[] = { 105 { AF_INET, NG_IFACE_HOOK_INET }, 106 { AF_INET6, NG_IFACE_HOOK_INET6 }, 107 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 108 { AF_IPX, NG_IFACE_HOOK_IPX }, 109 { AF_ATM, NG_IFACE_HOOK_ATM }, 110 { AF_NATM, NG_IFACE_HOOK_NATM }, 111 }; 112 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 113 114 /* Node private data */ 115 struct ng_iface_private { 116 struct ifnet *ifp; /* Our interface */ 117 int unit; /* Interface unit number */ 118 node_p node; /* Our netgraph node */ 119 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 120 }; 121 typedef struct ng_iface_private *priv_p; 122 123 /* Interface methods */ 124 static void ng_iface_start(struct ifnet *ifp); 125 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 126 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 127 const struct sockaddr *dst, struct route *ro); 128 static void ng_iface_bpftap(struct ifnet *ifp, 129 struct mbuf *m, sa_family_t family); 130 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 131 sa_family_t sa); 132 #ifdef DEBUG 133 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 134 #endif 135 136 /* Netgraph methods */ 137 static int ng_iface_mod_event(module_t, int, void *); 138 static ng_constructor_t ng_iface_constructor; 139 static ng_rcvmsg_t ng_iface_rcvmsg; 140 static ng_shutdown_t ng_iface_shutdown; 141 static ng_newhook_t ng_iface_newhook; 142 static ng_rcvdata_t ng_iface_rcvdata; 143 static ng_disconnect_t ng_iface_disconnect; 144 145 /* Helper stuff */ 146 static iffam_p get_iffam_from_af(sa_family_t family); 147 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 148 static iffam_p get_iffam_from_name(const char *name); 149 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 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_parse_string_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 .mod_event = ng_iface_mod_event, 204 .constructor = ng_iface_constructor, 205 .rcvmsg = ng_iface_rcvmsg, 206 .shutdown = ng_iface_shutdown, 207 .newhook = ng_iface_newhook, 208 .rcvdata = ng_iface_rcvdata, 209 .disconnect = ng_iface_disconnect, 210 .cmdlist = ng_iface_cmds, 211 }; 212 NETGRAPH_INIT(iface, &typestruct); 213 214 static VNET_DEFINE(struct unrhdr *, ng_iface_unit); 215 #define V_ng_iface_unit VNET(ng_iface_unit) 216 217 /************************************************************************ 218 HELPER STUFF 219 ************************************************************************/ 220 221 /* 222 * Get the family descriptor from the family ID 223 */ 224 static __inline iffam_p 225 get_iffam_from_af(sa_family_t family) 226 { 227 iffam_p iffam; 228 int k; 229 230 for (k = 0; k < NUM_FAMILIES; k++) { 231 iffam = &gFamilies[k]; 232 if (iffam->family == family) 233 return (iffam); 234 } 235 return (NULL); 236 } 237 238 /* 239 * Get the family descriptor from the hook 240 */ 241 static __inline iffam_p 242 get_iffam_from_hook(priv_p priv, hook_p hook) 243 { 244 int k; 245 246 for (k = 0; k < NUM_FAMILIES; k++) 247 if (priv->hooks[k] == hook) 248 return (&gFamilies[k]); 249 return (NULL); 250 } 251 252 /* 253 * Get the hook from the iffam descriptor 254 */ 255 256 static __inline hook_p * 257 get_hook_from_iffam(priv_p priv, iffam_p iffam) 258 { 259 return (&priv->hooks[iffam - gFamilies]); 260 } 261 262 /* 263 * Get the iffam descriptor from the name 264 */ 265 static __inline iffam_p 266 get_iffam_from_name(const char *name) 267 { 268 iffam_p iffam; 269 int k; 270 271 for (k = 0; k < NUM_FAMILIES; k++) { 272 iffam = &gFamilies[k]; 273 if (!strcmp(iffam->hookname, name)) 274 return (iffam); 275 } 276 return (NULL); 277 } 278 279 /************************************************************************ 280 INTERFACE STUFF 281 ************************************************************************/ 282 283 /* 284 * Process an ioctl for the virtual interface 285 */ 286 static int 287 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 288 { 289 struct ifreq *const ifr = (struct ifreq *) data; 290 int error = 0; 291 292 #ifdef DEBUG 293 ng_iface_print_ioctl(ifp, command, data); 294 #endif 295 switch (command) { 296 297 /* These two are mostly handled at a higher layer */ 298 case SIOCSIFADDR: 299 ifp->if_flags |= IFF_UP; 300 ifp->if_drv_flags |= IFF_DRV_RUNNING; 301 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 302 break; 303 case SIOCGIFADDR: 304 break; 305 306 /* Set flags */ 307 case SIOCSIFFLAGS: 308 /* 309 * If the interface is marked up and stopped, then start it. 310 * If it is marked down and running, then stop it. 311 */ 312 if (ifr->ifr_flags & IFF_UP) { 313 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 314 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 315 ifp->if_drv_flags |= IFF_DRV_RUNNING; 316 } 317 } else { 318 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 319 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 320 IFF_DRV_OACTIVE); 321 } 322 break; 323 324 /* Set the interface MTU */ 325 case SIOCSIFMTU: 326 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 327 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 328 error = EINVAL; 329 else 330 ifp->if_mtu = ifr->ifr_mtu; 331 break; 332 333 /* Stuff that's not supported */ 334 case SIOCADDMULTI: 335 case SIOCDELMULTI: 336 error = 0; 337 break; 338 case SIOCSIFPHYS: 339 error = EOPNOTSUPP; 340 break; 341 342 default: 343 error = EINVAL; 344 break; 345 } 346 return (error); 347 } 348 349 /* 350 * This routine is called to deliver a packet out the interface. 351 * We simply look at the address family and relay the packet to 352 * the corresponding hook, if it exists and is connected. 353 */ 354 355 static int 356 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 357 const struct sockaddr *dst, struct route *ro) 358 { 359 struct m_tag *mtag; 360 uint32_t af; 361 int error; 362 363 /* Check interface flags */ 364 if (!((ifp->if_flags & IFF_UP) && 365 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 366 m_freem(m); 367 return (ENETDOWN); 368 } 369 370 /* Protect from deadly infinite recursion. */ 371 mtag = NULL; 372 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) { 373 if (*(struct ifnet **)(mtag + 1) == ifp) { 374 log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname); 375 m_freem(m); 376 return (EDEADLK); 377 } 378 } 379 mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *), 380 M_NOWAIT); 381 if (mtag == NULL) { 382 m_freem(m); 383 return (ENOMEM); 384 } 385 *(struct ifnet **)(mtag + 1) = ifp; 386 m_tag_prepend(m, mtag); 387 388 /* BPF writes need to be handled specially. */ 389 if (dst->sa_family == AF_UNSPEC) 390 bcopy(dst->sa_data, &af, sizeof(af)); 391 else 392 af = dst->sa_family; 393 394 /* Berkeley packet filter */ 395 ng_iface_bpftap(ifp, m, af); 396 397 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 398 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT); 399 if (m == NULL) { 400 IFQ_LOCK(&ifp->if_snd); 401 IFQ_INC_DROPS(&ifp->if_snd); 402 IFQ_UNLOCK(&ifp->if_snd); 403 ifp->if_oerrors++; 404 return (ENOBUFS); 405 } 406 *(sa_family_t *)m->m_data = af; 407 error = (ifp->if_transmit)(ifp, m); 408 } else 409 error = ng_iface_send(ifp, m, af); 410 411 return (error); 412 } 413 414 /* 415 * Start method is used only when ALTQ is enabled. 416 */ 417 static void 418 ng_iface_start(struct ifnet *ifp) 419 { 420 struct mbuf *m; 421 sa_family_t sa; 422 423 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 424 425 for(;;) { 426 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 427 if (m == NULL) 428 break; 429 sa = *mtod(m, sa_family_t *); 430 m_adj(m, sizeof(sa_family_t)); 431 ng_iface_send(ifp, m, sa); 432 } 433 } 434 435 /* 436 * Flash a packet by the BPF (requires prepending 4 byte AF header) 437 * Note the phoney mbuf; this is OK because BPF treats it read-only. 438 */ 439 static void 440 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 441 { 442 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 443 if (bpf_peers_present(ifp->if_bpf)) { 444 int32_t family4 = (int32_t)family; 445 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 446 } 447 } 448 449 /* 450 * This routine does actual delivery of the packet into the 451 * netgraph(4). It is called from ng_iface_start() and 452 * ng_iface_output(). 453 */ 454 static int 455 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 456 { 457 const priv_p priv = (priv_p) ifp->if_softc; 458 const iffam_p iffam = get_iffam_from_af(sa); 459 int error; 460 int len; 461 462 /* Check address family to determine hook (if known) */ 463 if (iffam == NULL) { 464 m_freem(m); 465 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 466 return (EAFNOSUPPORT); 467 } 468 469 /* Copy length before the mbuf gets invalidated. */ 470 len = m->m_pkthdr.len; 471 472 /* Send packet. If hook is not connected, mbuf will get freed. */ 473 NG_OUTBOUND_THREAD_REF(); 474 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 475 NG_OUTBOUND_THREAD_UNREF(); 476 477 /* Update stats. */ 478 if (error == 0) { 479 ifp->if_obytes += len; 480 ifp->if_opackets++; 481 } 482 483 return (error); 484 } 485 486 #ifdef DEBUG 487 /* 488 * Display an ioctl to the virtual interface 489 */ 490 491 static void 492 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 493 { 494 char *str; 495 496 switch (command & IOC_DIRMASK) { 497 case IOC_VOID: 498 str = "IO"; 499 break; 500 case IOC_OUT: 501 str = "IOR"; 502 break; 503 case IOC_IN: 504 str = "IOW"; 505 break; 506 case IOC_INOUT: 507 str = "IORW"; 508 break; 509 default: 510 str = "IO??"; 511 } 512 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 513 ifp->if_xname, 514 str, 515 IOCGROUP(command), 516 command & 0xff, 517 IOCPARM_LEN(command)); 518 } 519 #endif /* DEBUG */ 520 521 /************************************************************************ 522 NETGRAPH NODE STUFF 523 ************************************************************************/ 524 525 /* 526 * Constructor for a node 527 */ 528 static int 529 ng_iface_constructor(node_p node) 530 { 531 struct ifnet *ifp; 532 priv_p priv; 533 534 /* Allocate node and interface private structures */ 535 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO); 536 ifp = if_alloc(IFT_PROPVIRTUAL); 537 if (ifp == NULL) { 538 free(priv, M_NETGRAPH_IFACE); 539 return (ENOMEM); 540 } 541 542 /* Link them together */ 543 ifp->if_softc = priv; 544 priv->ifp = ifp; 545 546 /* Get an interface unit number */ 547 priv->unit = alloc_unr(V_ng_iface_unit); 548 549 /* Link together node and private info */ 550 NG_NODE_SET_PRIVATE(node, priv); 551 priv->node = node; 552 553 /* Initialize interface structure */ 554 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 555 ifp->if_output = ng_iface_output; 556 ifp->if_start = ng_iface_start; 557 ifp->if_ioctl = ng_iface_ioctl; 558 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 559 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 560 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 561 ifp->if_addrlen = 0; /* XXX */ 562 ifp->if_hdrlen = 0; /* XXX */ 563 ifp->if_baudrate = 64000; /* XXX */ 564 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 565 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 566 IFQ_SET_READY(&ifp->if_snd); 567 568 /* Give this node the same name as the interface (if possible) */ 569 if (ng_name_node(node, ifp->if_xname) != 0) 570 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 571 ifp->if_xname); 572 573 /* Attach the interface */ 574 if_attach(ifp); 575 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 576 577 /* Done */ 578 return (0); 579 } 580 581 /* 582 * Give our ok for a hook to be added 583 */ 584 static int 585 ng_iface_newhook(node_p node, hook_p hook, const char *name) 586 { 587 const iffam_p iffam = get_iffam_from_name(name); 588 hook_p *hookptr; 589 590 if (iffam == NULL) 591 return (EPFNOSUPPORT); 592 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 593 if (*hookptr != NULL) 594 return (EISCONN); 595 *hookptr = hook; 596 NG_HOOK_HI_STACK(hook); 597 NG_HOOK_SET_TO_INBOUND(hook); 598 return (0); 599 } 600 601 /* 602 * Receive a control message 603 */ 604 static int 605 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 606 { 607 const priv_p priv = NG_NODE_PRIVATE(node); 608 struct ifnet *const ifp = priv->ifp; 609 struct ng_mesg *resp = NULL; 610 int error = 0; 611 struct ng_mesg *msg; 612 613 NGI_GET_MSG(item, msg); 614 switch (msg->header.typecookie) { 615 case NGM_IFACE_COOKIE: 616 switch (msg->header.cmd) { 617 case NGM_IFACE_GET_IFNAME: 618 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 619 if (resp == NULL) { 620 error = ENOMEM; 621 break; 622 } 623 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 624 break; 625 626 case NGM_IFACE_POINT2POINT: 627 case NGM_IFACE_BROADCAST: 628 { 629 630 /* Deny request if interface is UP */ 631 if ((ifp->if_flags & IFF_UP) != 0) 632 return (EBUSY); 633 634 /* Change flags */ 635 switch (msg->header.cmd) { 636 case NGM_IFACE_POINT2POINT: 637 ifp->if_flags |= IFF_POINTOPOINT; 638 ifp->if_flags &= ~IFF_BROADCAST; 639 break; 640 case NGM_IFACE_BROADCAST: 641 ifp->if_flags &= ~IFF_POINTOPOINT; 642 ifp->if_flags |= IFF_BROADCAST; 643 break; 644 } 645 break; 646 } 647 648 case NGM_IFACE_GET_IFINDEX: 649 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 650 if (resp == NULL) { 651 error = ENOMEM; 652 break; 653 } 654 *((uint32_t *)resp->data) = priv->ifp->if_index; 655 break; 656 657 default: 658 error = EINVAL; 659 break; 660 } 661 break; 662 case NGM_CISCO_COOKIE: 663 switch (msg->header.cmd) { 664 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 665 { 666 struct ifaddr *ifa; 667 668 /* Return the first configured IP address */ 669 if_addr_rlock(ifp); 670 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 671 struct ng_cisco_ipaddr *ips; 672 673 if (ifa->ifa_addr->sa_family != AF_INET) 674 continue; 675 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 676 if (resp == NULL) { 677 error = ENOMEM; 678 break; 679 } 680 ips = (struct ng_cisco_ipaddr *)resp->data; 681 ips->ipaddr = ((struct sockaddr_in *) 682 ifa->ifa_addr)->sin_addr; 683 ips->netmask = ((struct sockaddr_in *) 684 ifa->ifa_netmask)->sin_addr; 685 break; 686 } 687 if_addr_runlock(ifp); 688 689 /* No IP addresses on this interface? */ 690 if (ifa == NULL) 691 error = EADDRNOTAVAIL; 692 break; 693 } 694 default: 695 error = EINVAL; 696 break; 697 } 698 break; 699 case NGM_FLOW_COOKIE: 700 switch (msg->header.cmd) { 701 case NGM_LINK_IS_UP: 702 ifp->if_drv_flags |= IFF_DRV_RUNNING; 703 break; 704 case NGM_LINK_IS_DOWN: 705 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 706 break; 707 default: 708 break; 709 } 710 break; 711 default: 712 error = EINVAL; 713 break; 714 } 715 NG_RESPOND_MSG(error, node, item, resp); 716 NG_FREE_MSG(msg); 717 return (error); 718 } 719 720 /* 721 * Recive data from a hook. Pass the packet to the correct input routine. 722 */ 723 static int 724 ng_iface_rcvdata(hook_p hook, item_p item) 725 { 726 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 727 const iffam_p iffam = get_iffam_from_hook(priv, hook); 728 struct ifnet *const ifp = priv->ifp; 729 struct mbuf *m; 730 int isr; 731 732 NGI_GET_M(item, m); 733 NG_FREE_ITEM(item); 734 /* Sanity checks */ 735 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 736 M_ASSERTPKTHDR(m); 737 if ((ifp->if_flags & IFF_UP) == 0) { 738 NG_FREE_M(m); 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 /* Send packet */ 753 switch (iffam->family) { 754 #ifdef INET 755 case AF_INET: 756 isr = NETISR_IP; 757 break; 758 #endif 759 #ifdef INET6 760 case AF_INET6: 761 isr = NETISR_IPV6; 762 break; 763 #endif 764 #ifdef IPX 765 case AF_IPX: 766 isr = NETISR_IPX; 767 break; 768 #endif 769 #ifdef NETATALK 770 case AF_APPLETALK: 771 isr = NETISR_ATALK2; 772 break; 773 #endif 774 default: 775 m_freem(m); 776 return (EAFNOSUPPORT); 777 } 778 if (harvest.point_to_point) 779 random_harvest(&(m->m_data), 12, 2, RANDOM_NET_NG); 780 M_SETFIB(m, ifp->if_fib); 781 netisr_dispatch(isr, m); 782 return (0); 783 } 784 785 /* 786 * Shutdown and remove the node and its associated interface. 787 */ 788 static int 789 ng_iface_shutdown(node_p node) 790 { 791 const priv_p priv = NG_NODE_PRIVATE(node); 792 793 /* 794 * The ifnet may be in a different vnet than the netgraph node, 795 * hence we have to change the current vnet context here. 796 */ 797 CURVNET_SET_QUIET(priv->ifp->if_vnet); 798 bpfdetach(priv->ifp); 799 if_detach(priv->ifp); 800 if_free(priv->ifp); 801 CURVNET_RESTORE(); 802 priv->ifp = NULL; 803 free_unr(V_ng_iface_unit, priv->unit); 804 free(priv, M_NETGRAPH_IFACE); 805 NG_NODE_SET_PRIVATE(node, NULL); 806 NG_NODE_UNREF(node); 807 return (0); 808 } 809 810 /* 811 * Hook disconnection. Note that we do *not* shutdown when all 812 * hooks have been disconnected. 813 */ 814 static int 815 ng_iface_disconnect(hook_p hook) 816 { 817 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 818 const iffam_p iffam = get_iffam_from_hook(priv, hook); 819 820 if (iffam == NULL) 821 panic("%s", __func__); 822 *get_hook_from_iffam(priv, iffam) = NULL; 823 return (0); 824 } 825 826 /* 827 * Handle loading and unloading for this node type. 828 */ 829 static int 830 ng_iface_mod_event(module_t mod, int event, void *data) 831 { 832 int error = 0; 833 834 switch (event) { 835 case MOD_LOAD: 836 case MOD_UNLOAD: 837 break; 838 default: 839 error = EOPNOTSUPP; 840 break; 841 } 842 return (error); 843 } 844 845 static void 846 vnet_ng_iface_init(const void *unused) 847 { 848 849 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 850 } 851 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 852 vnet_ng_iface_init, NULL); 853 854 static void 855 vnet_ng_iface_uninit(const void *unused) 856 { 857 858 delete_unrhdr(V_ng_iface_unit); 859 } 860 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 861 vnet_ng_iface_uninit, NULL); 862